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/rhashtable.h>
18 #include <linux/netfilter.h>
19 #include <linux/netfilter/nfnetlink.h>
20 #include <linux/netfilter/nf_tables.h>
21 #include <net/netfilter/nf_flow_table.h>
22 #include <net/netfilter/nf_tables_core.h>
23 #include <net/netfilter/nf_tables.h>
24 #include <net/net_namespace.h>
27 #define NFT_MODULE_AUTOLOAD_LIMIT (MODULE_NAME_LEN - sizeof("nft-expr-255-"))
29 static LIST_HEAD(nf_tables_expressions);
30 static LIST_HEAD(nf_tables_objects);
31 static LIST_HEAD(nf_tables_flowtables);
32 static u64 table_handle;
35 NFT_VALIDATE_SKIP = 0,
40 static u32 nft_chain_hash(const void *data, u32 len, u32 seed);
41 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed);
42 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *, const void *);
44 static const struct rhashtable_params nft_chain_ht_params = {
45 .head_offset = offsetof(struct nft_chain, rhlhead),
46 .key_offset = offsetof(struct nft_chain, name),
47 .hashfn = nft_chain_hash,
48 .obj_hashfn = nft_chain_hash_obj,
49 .obj_cmpfn = nft_chain_hash_cmp,
51 .automatic_shrinking = true,
54 static void nft_validate_state_update(struct net *net, u8 new_validate_state)
56 switch (net->nft.validate_state) {
57 case NFT_VALIDATE_SKIP:
58 WARN_ON_ONCE(new_validate_state == NFT_VALIDATE_DO);
60 case NFT_VALIDATE_NEED:
63 if (new_validate_state == NFT_VALIDATE_NEED)
67 net->nft.validate_state = new_validate_state;
70 static void nft_ctx_init(struct nft_ctx *ctx,
72 const struct sk_buff *skb,
73 const struct nlmsghdr *nlh,
75 struct nft_table *table,
76 struct nft_chain *chain,
77 const struct nlattr * const *nla)
85 ctx->portid = NETLINK_CB(skb).portid;
86 ctx->report = nlmsg_report(nlh);
87 ctx->seq = nlh->nlmsg_seq;
90 static struct nft_trans *nft_trans_alloc_gfp(const struct nft_ctx *ctx,
91 int msg_type, u32 size, gfp_t gfp)
93 struct nft_trans *trans;
95 trans = kzalloc(sizeof(struct nft_trans) + size, gfp);
99 INIT_LIST_HEAD(&trans->list);
100 trans->msg_type = msg_type;
106 static struct nft_trans *nft_trans_alloc(const struct nft_ctx *ctx,
107 int msg_type, u32 size)
109 return nft_trans_alloc_gfp(ctx, msg_type, size, GFP_KERNEL);
112 static void nft_trans_destroy(struct nft_trans *trans)
114 list_del(&trans->list);
118 static void nft_set_trans_bind(const struct nft_ctx *ctx, struct nft_set *set)
120 struct net *net = ctx->net;
121 struct nft_trans *trans;
123 if (!nft_set_is_anonymous(set))
126 list_for_each_entry_reverse(trans, &net->nft.commit_list, list) {
127 switch (trans->msg_type) {
129 if (nft_trans_set(trans) == set)
130 nft_trans_set_bound(trans) = true;
132 case NFT_MSG_NEWSETELEM:
133 if (nft_trans_elem_set(trans) == set)
134 nft_trans_elem_set_bound(trans) = true;
140 static int nf_tables_register_hook(struct net *net,
141 const struct nft_table *table,
142 struct nft_chain *chain)
144 const struct nft_base_chain *basechain;
145 const struct nf_hook_ops *ops;
147 if (table->flags & NFT_TABLE_F_DORMANT ||
148 !nft_is_base_chain(chain))
151 basechain = nft_base_chain(chain);
152 ops = &basechain->ops;
154 if (basechain->type->ops_register)
155 return basechain->type->ops_register(net, ops);
157 return nf_register_net_hook(net, ops);
160 static void nf_tables_unregister_hook(struct net *net,
161 const struct nft_table *table,
162 struct nft_chain *chain)
164 const struct nft_base_chain *basechain;
165 const struct nf_hook_ops *ops;
167 if (table->flags & NFT_TABLE_F_DORMANT ||
168 !nft_is_base_chain(chain))
170 basechain = nft_base_chain(chain);
171 ops = &basechain->ops;
173 if (basechain->type->ops_unregister)
174 return basechain->type->ops_unregister(net, ops);
176 nf_unregister_net_hook(net, ops);
179 static int nft_trans_table_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_table));
187 if (msg_type == NFT_MSG_NEWTABLE)
188 nft_activate_next(ctx->net, ctx->table);
190 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
194 static int nft_deltable(struct nft_ctx *ctx)
198 err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE);
202 nft_deactivate_next(ctx->net, ctx->table);
206 static int nft_trans_chain_add(struct nft_ctx *ctx, int msg_type)
208 struct nft_trans *trans;
210 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain));
214 if (msg_type == NFT_MSG_NEWCHAIN)
215 nft_activate_next(ctx->net, ctx->chain);
217 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
221 static int nft_delchain(struct nft_ctx *ctx)
225 err = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN);
230 nft_deactivate_next(ctx->net, ctx->chain);
235 static void nft_rule_expr_activate(const struct nft_ctx *ctx,
236 struct nft_rule *rule)
238 struct nft_expr *expr;
240 expr = nft_expr_first(rule);
241 while (expr != nft_expr_last(rule) && expr->ops) {
242 if (expr->ops->activate)
243 expr->ops->activate(ctx, expr);
245 expr = nft_expr_next(expr);
249 static void nft_rule_expr_deactivate(const struct nft_ctx *ctx,
250 struct nft_rule *rule,
251 enum nft_trans_phase phase)
253 struct nft_expr *expr;
255 expr = nft_expr_first(rule);
256 while (expr != nft_expr_last(rule) && expr->ops) {
257 if (expr->ops->deactivate)
258 expr->ops->deactivate(ctx, expr, phase);
260 expr = nft_expr_next(expr);
265 nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule)
267 /* You cannot delete the same rule twice */
268 if (nft_is_active_next(ctx->net, rule)) {
269 nft_deactivate_next(ctx->net, rule);
276 static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type,
277 struct nft_rule *rule)
279 struct nft_trans *trans;
281 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule));
285 if (msg_type == NFT_MSG_NEWRULE && ctx->nla[NFTA_RULE_ID] != NULL) {
286 nft_trans_rule_id(trans) =
287 ntohl(nla_get_be32(ctx->nla[NFTA_RULE_ID]));
289 nft_trans_rule(trans) = rule;
290 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
295 static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule)
297 struct nft_trans *trans;
300 trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule);
304 err = nf_tables_delrule_deactivate(ctx, rule);
306 nft_trans_destroy(trans);
309 nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_PREPARE);
314 static int nft_delrule_by_chain(struct nft_ctx *ctx)
316 struct nft_rule *rule;
319 list_for_each_entry(rule, &ctx->chain->rules, list) {
320 if (!nft_is_active_next(ctx->net, rule))
323 err = nft_delrule(ctx, rule);
330 static int nft_trans_set_add(const struct nft_ctx *ctx, int msg_type,
333 struct nft_trans *trans;
335 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
339 if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] != NULL) {
340 nft_trans_set_id(trans) =
341 ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
342 nft_activate_next(ctx->net, set);
344 nft_trans_set(trans) = set;
345 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
350 static int nft_delset(const struct nft_ctx *ctx, struct nft_set *set)
354 err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set);
358 nft_deactivate_next(ctx->net, set);
364 static int nft_trans_obj_add(struct nft_ctx *ctx, int msg_type,
365 struct nft_object *obj)
367 struct nft_trans *trans;
369 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_obj));
373 if (msg_type == NFT_MSG_NEWOBJ)
374 nft_activate_next(ctx->net, obj);
376 nft_trans_obj(trans) = obj;
377 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
382 static int nft_delobj(struct nft_ctx *ctx, struct nft_object *obj)
386 err = nft_trans_obj_add(ctx, NFT_MSG_DELOBJ, obj);
390 nft_deactivate_next(ctx->net, obj);
396 static int nft_trans_flowtable_add(struct nft_ctx *ctx, int msg_type,
397 struct nft_flowtable *flowtable)
399 struct nft_trans *trans;
401 trans = nft_trans_alloc(ctx, msg_type,
402 sizeof(struct nft_trans_flowtable));
406 if (msg_type == NFT_MSG_NEWFLOWTABLE)
407 nft_activate_next(ctx->net, flowtable);
409 nft_trans_flowtable(trans) = flowtable;
410 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
415 static int nft_delflowtable(struct nft_ctx *ctx,
416 struct nft_flowtable *flowtable)
420 err = nft_trans_flowtable_add(ctx, NFT_MSG_DELFLOWTABLE, flowtable);
424 nft_deactivate_next(ctx->net, flowtable);
434 static struct nft_table *nft_table_lookup(const struct net *net,
435 const struct nlattr *nla,
436 u8 family, u8 genmask)
438 struct nft_table *table;
441 return ERR_PTR(-EINVAL);
443 list_for_each_entry_rcu(table, &net->nft.tables, list) {
444 if (!nla_strcmp(nla, table->name) &&
445 table->family == family &&
446 nft_active_genmask(table, genmask))
450 return ERR_PTR(-ENOENT);
453 static struct nft_table *nft_table_lookup_byhandle(const struct net *net,
454 const struct nlattr *nla,
457 struct nft_table *table;
459 list_for_each_entry(table, &net->nft.tables, list) {
460 if (be64_to_cpu(nla_get_be64(nla)) == table->handle &&
461 nft_active_genmask(table, genmask))
465 return ERR_PTR(-ENOENT);
468 static inline u64 nf_tables_alloc_handle(struct nft_table *table)
470 return ++table->hgenerator;
473 static const struct nft_chain_type *chain_type[NFPROTO_NUMPROTO][NFT_CHAIN_T_MAX];
475 static const struct nft_chain_type *
476 __nft_chain_type_get(u8 family, enum nft_chain_types type)
478 if (family >= NFPROTO_NUMPROTO ||
479 type >= NFT_CHAIN_T_MAX)
482 return chain_type[family][type];
485 static const struct nft_chain_type *
486 __nf_tables_chain_type_lookup(const struct nlattr *nla, u8 family)
488 const struct nft_chain_type *type;
491 for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
492 type = __nft_chain_type_get(family, i);
495 if (!nla_strcmp(nla, type->name))
502 * Loading a module requires dropping mutex that guards the transaction.
503 * A different client might race to start a new transaction meanwhile. Zap the
504 * list of pending transaction and then restore it once the mutex is grabbed
505 * again. Users of this function return EAGAIN which implicitly triggers the
506 * transaction abort path to clean up the list of pending transactions.
508 #ifdef CONFIG_MODULES
509 static void nft_request_module(struct net *net, const char *fmt, ...)
511 char module_name[MODULE_NAME_LEN];
512 LIST_HEAD(commit_list);
516 list_splice_init(&net->nft.commit_list, &commit_list);
519 ret = vsnprintf(module_name, MODULE_NAME_LEN, fmt, args);
521 if (ret >= MODULE_NAME_LEN)
524 mutex_unlock(&net->nft.commit_mutex);
525 request_module("%s", module_name);
526 mutex_lock(&net->nft.commit_mutex);
528 WARN_ON_ONCE(!list_empty(&net->nft.commit_list));
529 list_splice(&commit_list, &net->nft.commit_list);
533 static void lockdep_nfnl_nft_mutex_not_held(void)
535 #ifdef CONFIG_PROVE_LOCKING
537 WARN_ON_ONCE(lockdep_nfnl_is_held(NFNL_SUBSYS_NFTABLES));
541 static const struct nft_chain_type *
542 nf_tables_chain_type_lookup(struct net *net, const struct nlattr *nla,
543 u8 family, bool autoload)
545 const struct nft_chain_type *type;
547 type = __nf_tables_chain_type_lookup(nla, family);
551 lockdep_nfnl_nft_mutex_not_held();
552 #ifdef CONFIG_MODULES
554 nft_request_module(net, "nft-chain-%u-%.*s", family,
555 nla_len(nla), (const char *)nla_data(nla));
556 type = __nf_tables_chain_type_lookup(nla, family);
558 return ERR_PTR(-EAGAIN);
561 return ERR_PTR(-ENOENT);
564 static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
565 [NFTA_TABLE_NAME] = { .type = NLA_STRING,
566 .len = NFT_TABLE_MAXNAMELEN - 1 },
567 [NFTA_TABLE_FLAGS] = { .type = NLA_U32 },
568 [NFTA_TABLE_HANDLE] = { .type = NLA_U64 },
571 static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
572 u32 portid, u32 seq, int event, u32 flags,
573 int family, const struct nft_table *table)
575 struct nlmsghdr *nlh;
576 struct nfgenmsg *nfmsg;
578 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
579 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
581 goto nla_put_failure;
583 nfmsg = nlmsg_data(nlh);
584 nfmsg->nfgen_family = family;
585 nfmsg->version = NFNETLINK_V0;
586 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
588 if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
589 nla_put_be32(skb, NFTA_TABLE_FLAGS, htonl(table->flags)) ||
590 nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)) ||
591 nla_put_be64(skb, NFTA_TABLE_HANDLE, cpu_to_be64(table->handle),
593 goto nla_put_failure;
599 nlmsg_trim(skb, nlh);
603 static void nf_tables_table_notify(const struct nft_ctx *ctx, int event)
609 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
612 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
616 err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
617 event, 0, ctx->family, ctx->table);
623 nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
624 ctx->report, GFP_KERNEL);
627 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
630 static int nf_tables_dump_tables(struct sk_buff *skb,
631 struct netlink_callback *cb)
633 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
634 const struct nft_table *table;
635 unsigned int idx = 0, s_idx = cb->args[0];
636 struct net *net = sock_net(skb->sk);
637 int family = nfmsg->nfgen_family;
640 cb->seq = net->nft.base_seq;
642 list_for_each_entry_rcu(table, &net->nft.tables, list) {
643 if (family != NFPROTO_UNSPEC && family != table->family)
649 memset(&cb->args[1], 0,
650 sizeof(cb->args) - sizeof(cb->args[0]));
651 if (!nft_is_active(net, table))
653 if (nf_tables_fill_table_info(skb, net,
654 NETLINK_CB(cb->skb).portid,
656 NFT_MSG_NEWTABLE, NLM_F_MULTI,
657 table->family, table) < 0)
660 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
670 static int nft_netlink_dump_start_rcu(struct sock *nlsk, struct sk_buff *skb,
671 const struct nlmsghdr *nlh,
672 struct netlink_dump_control *c)
676 if (!try_module_get(THIS_MODULE))
680 err = netlink_dump_start(nlsk, skb, nlh, c);
682 module_put(THIS_MODULE);
687 /* called with rcu_read_lock held */
688 static int nf_tables_gettable(struct net *net, struct sock *nlsk,
689 struct sk_buff *skb, const struct nlmsghdr *nlh,
690 const struct nlattr * const nla[],
691 struct netlink_ext_ack *extack)
693 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
694 u8 genmask = nft_genmask_cur(net);
695 const struct nft_table *table;
696 struct sk_buff *skb2;
697 int family = nfmsg->nfgen_family;
700 if (nlh->nlmsg_flags & NLM_F_DUMP) {
701 struct netlink_dump_control c = {
702 .dump = nf_tables_dump_tables,
703 .module = THIS_MODULE,
706 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
709 table = nft_table_lookup(net, nla[NFTA_TABLE_NAME], family, genmask);
711 NL_SET_BAD_ATTR(extack, nla[NFTA_TABLE_NAME]);
712 return PTR_ERR(table);
715 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
719 err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
720 nlh->nlmsg_seq, NFT_MSG_NEWTABLE, 0,
723 goto err_fill_table_info;
725 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
732 static void nft_table_disable(struct net *net, struct nft_table *table, u32 cnt)
734 struct nft_chain *chain;
737 list_for_each_entry(chain, &table->chains, list) {
738 if (!nft_is_active_next(net, chain))
740 if (!nft_is_base_chain(chain))
743 if (cnt && i++ == cnt)
746 nf_unregister_net_hook(net, &nft_base_chain(chain)->ops);
750 static int nf_tables_table_enable(struct net *net, struct nft_table *table)
752 struct nft_chain *chain;
755 list_for_each_entry(chain, &table->chains, list) {
756 if (!nft_is_active_next(net, chain))
758 if (!nft_is_base_chain(chain))
761 err = nf_register_net_hook(net, &nft_base_chain(chain)->ops);
770 nft_table_disable(net, table, i);
774 static void nf_tables_table_disable(struct net *net, struct nft_table *table)
776 nft_table_disable(net, table, 0);
779 static int nf_tables_updtable(struct nft_ctx *ctx)
781 struct nft_trans *trans;
785 if (!ctx->nla[NFTA_TABLE_FLAGS])
788 flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
789 if (flags & ~NFT_TABLE_F_DORMANT)
792 if (flags == ctx->table->flags)
795 trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
796 sizeof(struct nft_trans_table));
800 if ((flags & NFT_TABLE_F_DORMANT) &&
801 !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
802 nft_trans_table_enable(trans) = false;
803 } else if (!(flags & NFT_TABLE_F_DORMANT) &&
804 ctx->table->flags & NFT_TABLE_F_DORMANT) {
805 ret = nf_tables_table_enable(ctx->net, ctx->table);
807 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
808 nft_trans_table_enable(trans) = true;
814 nft_trans_table_update(trans) = true;
815 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
818 nft_trans_destroy(trans);
822 static u32 nft_chain_hash(const void *data, u32 len, u32 seed)
824 const char *name = data;
826 return jhash(name, strlen(name), seed);
829 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed)
831 const struct nft_chain *chain = data;
833 return nft_chain_hash(chain->name, 0, seed);
836 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *arg,
839 const struct nft_chain *chain = ptr;
840 const char *name = arg->key;
842 return strcmp(chain->name, name);
845 static int nf_tables_newtable(struct net *net, struct sock *nlsk,
846 struct sk_buff *skb, const struct nlmsghdr *nlh,
847 const struct nlattr * const nla[],
848 struct netlink_ext_ack *extack)
850 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
851 u8 genmask = nft_genmask_next(net);
852 int family = nfmsg->nfgen_family;
853 const struct nlattr *attr;
854 struct nft_table *table;
859 lockdep_assert_held(&net->nft.commit_mutex);
860 attr = nla[NFTA_TABLE_NAME];
861 table = nft_table_lookup(net, attr, family, genmask);
863 if (PTR_ERR(table) != -ENOENT)
864 return PTR_ERR(table);
866 if (nlh->nlmsg_flags & NLM_F_EXCL) {
867 NL_SET_BAD_ATTR(extack, attr);
870 if (nlh->nlmsg_flags & NLM_F_REPLACE)
873 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
874 return nf_tables_updtable(&ctx);
877 if (nla[NFTA_TABLE_FLAGS]) {
878 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
879 if (flags & ~NFT_TABLE_F_DORMANT)
884 table = kzalloc(sizeof(*table), GFP_KERNEL);
888 table->name = nla_strdup(attr, GFP_KERNEL);
889 if (table->name == NULL)
892 err = rhltable_init(&table->chains_ht, &nft_chain_ht_params);
896 INIT_LIST_HEAD(&table->chains);
897 INIT_LIST_HEAD(&table->sets);
898 INIT_LIST_HEAD(&table->objects);
899 INIT_LIST_HEAD(&table->flowtables);
900 table->family = family;
901 table->flags = flags;
902 table->handle = ++table_handle;
904 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
905 err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
909 list_add_tail_rcu(&table->list, &net->nft.tables);
912 rhltable_destroy(&table->chains_ht);
921 static int nft_flush_table(struct nft_ctx *ctx)
923 struct nft_flowtable *flowtable, *nft;
924 struct nft_chain *chain, *nc;
925 struct nft_object *obj, *ne;
926 struct nft_set *set, *ns;
929 list_for_each_entry(chain, &ctx->table->chains, list) {
930 if (!nft_is_active_next(ctx->net, chain))
935 err = nft_delrule_by_chain(ctx);
940 list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
941 if (!nft_is_active_next(ctx->net, set))
944 if (nft_set_is_anonymous(set) &&
945 !list_empty(&set->bindings))
948 err = nft_delset(ctx, set);
953 list_for_each_entry_safe(flowtable, nft, &ctx->table->flowtables, list) {
954 if (!nft_is_active_next(ctx->net, flowtable))
957 err = nft_delflowtable(ctx, flowtable);
962 list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) {
963 if (!nft_is_active_next(ctx->net, obj))
966 err = nft_delobj(ctx, obj);
971 list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
972 if (!nft_is_active_next(ctx->net, chain))
977 err = nft_delchain(ctx);
982 err = nft_deltable(ctx);
987 static int nft_flush(struct nft_ctx *ctx, int family)
989 struct nft_table *table, *nt;
990 const struct nlattr * const *nla = ctx->nla;
993 list_for_each_entry_safe(table, nt, &ctx->net->nft.tables, list) {
994 if (family != AF_UNSPEC && table->family != family)
997 ctx->family = table->family;
999 if (!nft_is_active_next(ctx->net, table))
1002 if (nla[NFTA_TABLE_NAME] &&
1003 nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
1008 err = nft_flush_table(ctx);
1016 static int nf_tables_deltable(struct net *net, struct sock *nlsk,
1017 struct sk_buff *skb, const struct nlmsghdr *nlh,
1018 const struct nlattr * const nla[],
1019 struct netlink_ext_ack *extack)
1021 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1022 u8 genmask = nft_genmask_next(net);
1023 int family = nfmsg->nfgen_family;
1024 const struct nlattr *attr;
1025 struct nft_table *table;
1028 nft_ctx_init(&ctx, net, skb, nlh, 0, NULL, NULL, nla);
1029 if (family == AF_UNSPEC ||
1030 (!nla[NFTA_TABLE_NAME] && !nla[NFTA_TABLE_HANDLE]))
1031 return nft_flush(&ctx, family);
1033 if (nla[NFTA_TABLE_HANDLE]) {
1034 attr = nla[NFTA_TABLE_HANDLE];
1035 table = nft_table_lookup_byhandle(net, attr, genmask);
1037 attr = nla[NFTA_TABLE_NAME];
1038 table = nft_table_lookup(net, attr, family, genmask);
1041 if (IS_ERR(table)) {
1042 NL_SET_BAD_ATTR(extack, attr);
1043 return PTR_ERR(table);
1046 if (nlh->nlmsg_flags & NLM_F_NONREC &&
1050 ctx.family = family;
1053 return nft_flush_table(&ctx);
1056 static void nf_tables_table_destroy(struct nft_ctx *ctx)
1058 if (WARN_ON(ctx->table->use > 0))
1061 rhltable_destroy(&ctx->table->chains_ht);
1062 kfree(ctx->table->name);
1066 void nft_register_chain_type(const struct nft_chain_type *ctype)
1068 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1069 if (WARN_ON(__nft_chain_type_get(ctype->family, ctype->type))) {
1070 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1073 chain_type[ctype->family][ctype->type] = ctype;
1074 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1076 EXPORT_SYMBOL_GPL(nft_register_chain_type);
1078 void nft_unregister_chain_type(const struct nft_chain_type *ctype)
1080 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1081 chain_type[ctype->family][ctype->type] = NULL;
1082 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1084 EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
1090 static struct nft_chain *
1091 nft_chain_lookup_byhandle(const struct nft_table *table, u64 handle, u8 genmask)
1093 struct nft_chain *chain;
1095 list_for_each_entry(chain, &table->chains, list) {
1096 if (chain->handle == handle &&
1097 nft_active_genmask(chain, genmask))
1101 return ERR_PTR(-ENOENT);
1104 static bool lockdep_commit_lock_is_held(struct net *net)
1106 #ifdef CONFIG_PROVE_LOCKING
1107 return lockdep_is_held(&net->nft.commit_mutex);
1113 static struct nft_chain *nft_chain_lookup(struct net *net,
1114 struct nft_table *table,
1115 const struct nlattr *nla, u8 genmask)
1117 char search[NFT_CHAIN_MAXNAMELEN + 1];
1118 struct rhlist_head *tmp, *list;
1119 struct nft_chain *chain;
1122 return ERR_PTR(-EINVAL);
1124 nla_strlcpy(search, nla, sizeof(search));
1126 WARN_ON(!rcu_read_lock_held() &&
1127 !lockdep_commit_lock_is_held(net));
1129 chain = ERR_PTR(-ENOENT);
1131 list = rhltable_lookup(&table->chains_ht, search, nft_chain_ht_params);
1135 rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
1136 if (nft_active_genmask(chain, genmask))
1139 chain = ERR_PTR(-ENOENT);
1145 static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
1146 [NFTA_CHAIN_TABLE] = { .type = NLA_STRING,
1147 .len = NFT_TABLE_MAXNAMELEN - 1 },
1148 [NFTA_CHAIN_HANDLE] = { .type = NLA_U64 },
1149 [NFTA_CHAIN_NAME] = { .type = NLA_STRING,
1150 .len = NFT_CHAIN_MAXNAMELEN - 1 },
1151 [NFTA_CHAIN_HOOK] = { .type = NLA_NESTED },
1152 [NFTA_CHAIN_POLICY] = { .type = NLA_U32 },
1153 [NFTA_CHAIN_TYPE] = { .type = NLA_STRING,
1154 .len = NFT_MODULE_AUTOLOAD_LIMIT },
1155 [NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED },
1158 static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
1159 [NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 },
1160 [NFTA_HOOK_PRIORITY] = { .type = NLA_U32 },
1161 [NFTA_HOOK_DEV] = { .type = NLA_STRING,
1162 .len = IFNAMSIZ - 1 },
1165 static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
1167 struct nft_stats *cpu_stats, total;
1168 struct nlattr *nest;
1176 memset(&total, 0, sizeof(total));
1177 for_each_possible_cpu(cpu) {
1178 cpu_stats = per_cpu_ptr(stats, cpu);
1180 seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
1181 pkts = cpu_stats->pkts;
1182 bytes = cpu_stats->bytes;
1183 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq));
1185 total.bytes += bytes;
1187 nest = nla_nest_start(skb, NFTA_CHAIN_COUNTERS);
1189 goto nla_put_failure;
1191 if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts),
1192 NFTA_COUNTER_PAD) ||
1193 nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
1195 goto nla_put_failure;
1197 nla_nest_end(skb, nest);
1204 static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
1205 u32 portid, u32 seq, int event, u32 flags,
1206 int family, const struct nft_table *table,
1207 const struct nft_chain *chain)
1209 struct nlmsghdr *nlh;
1210 struct nfgenmsg *nfmsg;
1212 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
1213 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
1215 goto nla_put_failure;
1217 nfmsg = nlmsg_data(nlh);
1218 nfmsg->nfgen_family = family;
1219 nfmsg->version = NFNETLINK_V0;
1220 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
1222 if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name))
1223 goto nla_put_failure;
1224 if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle),
1226 goto nla_put_failure;
1227 if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name))
1228 goto nla_put_failure;
1230 if (nft_is_base_chain(chain)) {
1231 const struct nft_base_chain *basechain = nft_base_chain(chain);
1232 const struct nf_hook_ops *ops = &basechain->ops;
1233 struct nft_stats __percpu *stats;
1234 struct nlattr *nest;
1236 nest = nla_nest_start(skb, NFTA_CHAIN_HOOK);
1238 goto nla_put_failure;
1239 if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
1240 goto nla_put_failure;
1241 if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
1242 goto nla_put_failure;
1243 if (basechain->dev_name[0] &&
1244 nla_put_string(skb, NFTA_HOOK_DEV, basechain->dev_name))
1245 goto nla_put_failure;
1246 nla_nest_end(skb, nest);
1248 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
1249 htonl(basechain->policy)))
1250 goto nla_put_failure;
1252 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
1253 goto nla_put_failure;
1255 stats = rcu_dereference_check(basechain->stats,
1256 lockdep_commit_lock_is_held(net));
1257 if (nft_dump_stats(skb, stats))
1258 goto nla_put_failure;
1261 if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
1262 goto nla_put_failure;
1264 nlmsg_end(skb, nlh);
1268 nlmsg_trim(skb, nlh);
1272 static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event)
1274 struct sk_buff *skb;
1278 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1281 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1285 err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
1286 event, 0, ctx->family, ctx->table,
1293 nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1294 ctx->report, GFP_KERNEL);
1297 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
1300 static int nf_tables_dump_chains(struct sk_buff *skb,
1301 struct netlink_callback *cb)
1303 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1304 const struct nft_table *table;
1305 const struct nft_chain *chain;
1306 unsigned int idx = 0, s_idx = cb->args[0];
1307 struct net *net = sock_net(skb->sk);
1308 int family = nfmsg->nfgen_family;
1311 cb->seq = net->nft.base_seq;
1313 list_for_each_entry_rcu(table, &net->nft.tables, list) {
1314 if (family != NFPROTO_UNSPEC && family != table->family)
1317 list_for_each_entry_rcu(chain, &table->chains, list) {
1321 memset(&cb->args[1], 0,
1322 sizeof(cb->args) - sizeof(cb->args[0]));
1323 if (!nft_is_active(net, chain))
1325 if (nf_tables_fill_chain_info(skb, net,
1326 NETLINK_CB(cb->skb).portid,
1330 table->family, table,
1334 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1345 /* called with rcu_read_lock held */
1346 static int nf_tables_getchain(struct net *net, struct sock *nlsk,
1347 struct sk_buff *skb, const struct nlmsghdr *nlh,
1348 const struct nlattr * const nla[],
1349 struct netlink_ext_ack *extack)
1351 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1352 u8 genmask = nft_genmask_cur(net);
1353 const struct nft_chain *chain;
1354 struct nft_table *table;
1355 struct sk_buff *skb2;
1356 int family = nfmsg->nfgen_family;
1359 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1360 struct netlink_dump_control c = {
1361 .dump = nf_tables_dump_chains,
1362 .module = THIS_MODULE,
1365 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
1368 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask);
1369 if (IS_ERR(table)) {
1370 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
1371 return PTR_ERR(table);
1374 chain = nft_chain_lookup(net, table, nla[NFTA_CHAIN_NAME], genmask);
1375 if (IS_ERR(chain)) {
1376 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
1377 return PTR_ERR(chain);
1380 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1384 err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
1385 nlh->nlmsg_seq, NFT_MSG_NEWCHAIN, 0,
1386 family, table, chain);
1388 goto err_fill_chain_info;
1390 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
1392 err_fill_chain_info:
1397 static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
1398 [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 },
1399 [NFTA_COUNTER_BYTES] = { .type = NLA_U64 },
1402 static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
1404 struct nlattr *tb[NFTA_COUNTER_MAX+1];
1405 struct nft_stats __percpu *newstats;
1406 struct nft_stats *stats;
1409 err = nla_parse_nested(tb, NFTA_COUNTER_MAX, attr, nft_counter_policy,
1412 return ERR_PTR(err);
1414 if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
1415 return ERR_PTR(-EINVAL);
1417 newstats = netdev_alloc_pcpu_stats(struct nft_stats);
1418 if (newstats == NULL)
1419 return ERR_PTR(-ENOMEM);
1421 /* Restore old counters on this cpu, no problem. Per-cpu statistics
1422 * are not exposed to userspace.
1425 stats = this_cpu_ptr(newstats);
1426 stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
1427 stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
1433 static void nft_chain_stats_replace(struct net *net,
1434 struct nft_base_chain *chain,
1435 struct nft_stats __percpu *newstats)
1437 struct nft_stats __percpu *oldstats;
1439 if (newstats == NULL)
1442 if (rcu_access_pointer(chain->stats)) {
1443 oldstats = rcu_dereference_protected(chain->stats,
1444 lockdep_commit_lock_is_held(net));
1445 rcu_assign_pointer(chain->stats, newstats);
1447 free_percpu(oldstats);
1449 rcu_assign_pointer(chain->stats, newstats);
1450 static_branch_inc(&nft_counters_enabled);
1454 static void nf_tables_chain_free_chain_rules(struct nft_chain *chain)
1456 struct nft_rule **g0 = rcu_dereference_raw(chain->rules_gen_0);
1457 struct nft_rule **g1 = rcu_dereference_raw(chain->rules_gen_1);
1463 /* should be NULL either via abort or via successful commit */
1464 WARN_ON_ONCE(chain->rules_next);
1465 kvfree(chain->rules_next);
1468 static void nf_tables_chain_destroy(struct nft_ctx *ctx)
1470 struct nft_chain *chain = ctx->chain;
1472 if (WARN_ON(chain->use > 0))
1475 /* no concurrent access possible anymore */
1476 nf_tables_chain_free_chain_rules(chain);
1478 if (nft_is_base_chain(chain)) {
1479 struct nft_base_chain *basechain = nft_base_chain(chain);
1481 module_put(basechain->type->owner);
1482 if (rcu_access_pointer(basechain->stats)) {
1483 static_branch_dec(&nft_counters_enabled);
1484 free_percpu(rcu_dereference_raw(basechain->stats));
1494 struct nft_chain_hook {
1497 const struct nft_chain_type *type;
1498 struct net_device *dev;
1501 static int nft_chain_parse_hook(struct net *net,
1502 const struct nlattr * const nla[],
1503 struct nft_chain_hook *hook, u8 family,
1506 struct nlattr *ha[NFTA_HOOK_MAX + 1];
1507 const struct nft_chain_type *type;
1508 struct net_device *dev;
1511 lockdep_assert_held(&net->nft.commit_mutex);
1512 lockdep_nfnl_nft_mutex_not_held();
1514 err = nla_parse_nested(ha, NFTA_HOOK_MAX, nla[NFTA_CHAIN_HOOK],
1515 nft_hook_policy, NULL);
1519 if (ha[NFTA_HOOK_HOOKNUM] == NULL ||
1520 ha[NFTA_HOOK_PRIORITY] == NULL)
1523 hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
1524 hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
1526 type = __nft_chain_type_get(family, NFT_CHAIN_T_DEFAULT);
1530 if (nla[NFTA_CHAIN_TYPE]) {
1531 type = nf_tables_chain_type_lookup(net, nla[NFTA_CHAIN_TYPE],
1534 return PTR_ERR(type);
1536 if (hook->num > NF_MAX_HOOKS || !(type->hook_mask & (1 << hook->num)))
1539 if (type->type == NFT_CHAIN_T_NAT &&
1540 hook->priority <= NF_IP_PRI_CONNTRACK)
1543 if (!try_module_get(type->owner))
1549 if (family == NFPROTO_NETDEV) {
1550 char ifname[IFNAMSIZ];
1552 if (!ha[NFTA_HOOK_DEV]) {
1553 module_put(type->owner);
1557 nla_strlcpy(ifname, ha[NFTA_HOOK_DEV], IFNAMSIZ);
1558 dev = __dev_get_by_name(net, ifname);
1560 module_put(type->owner);
1564 } else if (ha[NFTA_HOOK_DEV]) {
1565 module_put(type->owner);
1572 static void nft_chain_release_hook(struct nft_chain_hook *hook)
1574 module_put(hook->type->owner);
1577 struct nft_rules_old {
1579 struct nft_rule **start;
1582 static struct nft_rule **nf_tables_chain_alloc_rules(const struct nft_chain *chain,
1585 if (alloc > INT_MAX)
1588 alloc += 1; /* NULL, ends rules */
1589 if (sizeof(struct nft_rule *) > INT_MAX / alloc)
1592 alloc *= sizeof(struct nft_rule *);
1593 alloc += sizeof(struct nft_rules_old);
1595 return kvmalloc(alloc, GFP_KERNEL);
1598 static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask,
1601 const struct nlattr * const *nla = ctx->nla;
1602 struct nft_table *table = ctx->table;
1603 struct nft_base_chain *basechain;
1604 struct nft_stats __percpu *stats;
1605 struct net *net = ctx->net;
1606 struct nft_chain *chain;
1607 struct nft_rule **rules;
1610 if (table->use == UINT_MAX)
1613 if (nla[NFTA_CHAIN_HOOK]) {
1614 struct nft_chain_hook hook;
1615 struct nf_hook_ops *ops;
1617 err = nft_chain_parse_hook(net, nla, &hook, family, true);
1621 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL);
1622 if (basechain == NULL) {
1623 nft_chain_release_hook(&hook);
1627 if (hook.dev != NULL)
1628 strncpy(basechain->dev_name, hook.dev->name, IFNAMSIZ);
1630 if (nla[NFTA_CHAIN_COUNTERS]) {
1631 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1632 if (IS_ERR(stats)) {
1633 nft_chain_release_hook(&hook);
1635 return PTR_ERR(stats);
1637 rcu_assign_pointer(basechain->stats, stats);
1638 static_branch_inc(&nft_counters_enabled);
1641 basechain->type = hook.type;
1642 chain = &basechain->chain;
1644 ops = &basechain->ops;
1646 ops->hooknum = hook.num;
1647 ops->priority = hook.priority;
1649 ops->hook = hook.type->hooks[ops->hooknum];
1650 ops->dev = hook.dev;
1652 chain->flags |= NFT_BASE_CHAIN;
1653 basechain->policy = policy;
1655 chain = kzalloc(sizeof(*chain), GFP_KERNEL);
1661 INIT_LIST_HEAD(&chain->rules);
1662 chain->handle = nf_tables_alloc_handle(table);
1663 chain->table = table;
1664 chain->name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL);
1670 rules = nf_tables_chain_alloc_rules(chain, 0);
1677 rcu_assign_pointer(chain->rules_gen_0, rules);
1678 rcu_assign_pointer(chain->rules_gen_1, rules);
1680 err = nf_tables_register_hook(net, table, chain);
1684 err = rhltable_insert_key(&table->chains_ht, chain->name,
1685 &chain->rhlhead, nft_chain_ht_params);
1689 err = nft_trans_chain_add(ctx, NFT_MSG_NEWCHAIN);
1691 rhltable_remove(&table->chains_ht, &chain->rhlhead,
1692 nft_chain_ht_params);
1697 list_add_tail_rcu(&chain->list, &table->chains);
1701 nf_tables_unregister_hook(net, table, chain);
1703 nf_tables_chain_destroy(ctx);
1708 static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy)
1710 const struct nlattr * const *nla = ctx->nla;
1711 struct nft_table *table = ctx->table;
1712 struct nft_chain *chain = ctx->chain;
1713 struct nft_base_chain *basechain;
1714 struct nft_stats *stats = NULL;
1715 struct nft_chain_hook hook;
1716 struct nf_hook_ops *ops;
1717 struct nft_trans *trans;
1720 if (nla[NFTA_CHAIN_HOOK]) {
1721 if (!nft_is_base_chain(chain))
1724 err = nft_chain_parse_hook(ctx->net, nla, &hook, ctx->family,
1729 basechain = nft_base_chain(chain);
1730 if (basechain->type != hook.type) {
1731 nft_chain_release_hook(&hook);
1735 ops = &basechain->ops;
1736 if (ops->hooknum != hook.num ||
1737 ops->priority != hook.priority ||
1738 ops->dev != hook.dev) {
1739 nft_chain_release_hook(&hook);
1742 nft_chain_release_hook(&hook);
1745 if (nla[NFTA_CHAIN_HANDLE] &&
1746 nla[NFTA_CHAIN_NAME]) {
1747 struct nft_chain *chain2;
1749 chain2 = nft_chain_lookup(ctx->net, table,
1750 nla[NFTA_CHAIN_NAME], genmask);
1751 if (!IS_ERR(chain2))
1755 if (nla[NFTA_CHAIN_COUNTERS]) {
1756 if (!nft_is_base_chain(chain))
1759 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1761 return PTR_ERR(stats);
1765 trans = nft_trans_alloc(ctx, NFT_MSG_NEWCHAIN,
1766 sizeof(struct nft_trans_chain));
1770 nft_trans_chain_stats(trans) = stats;
1771 nft_trans_chain_update(trans) = true;
1773 if (nla[NFTA_CHAIN_POLICY])
1774 nft_trans_chain_policy(trans) = policy;
1776 nft_trans_chain_policy(trans) = -1;
1778 if (nla[NFTA_CHAIN_HANDLE] &&
1779 nla[NFTA_CHAIN_NAME]) {
1780 struct nft_trans *tmp;
1784 name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL);
1789 list_for_each_entry(tmp, &ctx->net->nft.commit_list, list) {
1790 if (tmp->msg_type == NFT_MSG_NEWCHAIN &&
1791 tmp->ctx.table == table &&
1792 nft_trans_chain_update(tmp) &&
1793 nft_trans_chain_name(tmp) &&
1794 strcmp(name, nft_trans_chain_name(tmp)) == 0) {
1800 nft_trans_chain_name(trans) = name;
1802 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
1811 static int nf_tables_newchain(struct net *net, struct sock *nlsk,
1812 struct sk_buff *skb, const struct nlmsghdr *nlh,
1813 const struct nlattr * const nla[],
1814 struct netlink_ext_ack *extack)
1816 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1817 u8 genmask = nft_genmask_next(net);
1818 int family = nfmsg->nfgen_family;
1819 const struct nlattr *attr;
1820 struct nft_table *table;
1821 struct nft_chain *chain;
1822 u8 policy = NF_ACCEPT;
1826 lockdep_assert_held(&net->nft.commit_mutex);
1828 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask);
1829 if (IS_ERR(table)) {
1830 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
1831 return PTR_ERR(table);
1835 attr = nla[NFTA_CHAIN_NAME];
1837 if (nla[NFTA_CHAIN_HANDLE]) {
1838 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
1839 chain = nft_chain_lookup_byhandle(table, handle, genmask);
1840 if (IS_ERR(chain)) {
1841 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_HANDLE]);
1842 return PTR_ERR(chain);
1844 attr = nla[NFTA_CHAIN_HANDLE];
1846 chain = nft_chain_lookup(net, table, attr, genmask);
1847 if (IS_ERR(chain)) {
1848 if (PTR_ERR(chain) != -ENOENT) {
1849 NL_SET_BAD_ATTR(extack, attr);
1850 return PTR_ERR(chain);
1856 if (nla[NFTA_CHAIN_POLICY]) {
1857 if (chain != NULL &&
1858 !nft_is_base_chain(chain)) {
1859 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
1863 if (chain == NULL &&
1864 nla[NFTA_CHAIN_HOOK] == NULL) {
1865 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
1869 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
1879 nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
1881 if (chain != NULL) {
1882 if (nlh->nlmsg_flags & NLM_F_EXCL) {
1883 NL_SET_BAD_ATTR(extack, attr);
1886 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1889 return nf_tables_updchain(&ctx, genmask, policy);
1892 return nf_tables_addchain(&ctx, family, genmask, policy);
1895 static int nf_tables_delchain(struct net *net, struct sock *nlsk,
1896 struct sk_buff *skb, const struct nlmsghdr *nlh,
1897 const struct nlattr * const nla[],
1898 struct netlink_ext_ack *extack)
1900 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1901 u8 genmask = nft_genmask_next(net);
1902 int family = nfmsg->nfgen_family;
1903 const struct nlattr *attr;
1904 struct nft_table *table;
1905 struct nft_chain *chain;
1906 struct nft_rule *rule;
1912 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask);
1913 if (IS_ERR(table)) {
1914 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
1915 return PTR_ERR(table);
1918 if (nla[NFTA_CHAIN_HANDLE]) {
1919 attr = nla[NFTA_CHAIN_HANDLE];
1920 handle = be64_to_cpu(nla_get_be64(attr));
1921 chain = nft_chain_lookup_byhandle(table, handle, genmask);
1923 attr = nla[NFTA_CHAIN_NAME];
1924 chain = nft_chain_lookup(net, table, attr, genmask);
1926 if (IS_ERR(chain)) {
1927 NL_SET_BAD_ATTR(extack, attr);
1928 return PTR_ERR(chain);
1931 if (nlh->nlmsg_flags & NLM_F_NONREC &&
1935 nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
1938 list_for_each_entry(rule, &chain->rules, list) {
1939 if (!nft_is_active_next(net, rule))
1943 err = nft_delrule(&ctx, rule);
1948 /* There are rules and elements that are still holding references to us,
1949 * we cannot do a recursive removal in this case.
1952 NL_SET_BAD_ATTR(extack, attr);
1956 return nft_delchain(&ctx);
1964 * nft_register_expr - register nf_tables expr type
1967 * Registers the expr type for use with nf_tables. Returns zero on
1968 * success or a negative errno code otherwise.
1970 int nft_register_expr(struct nft_expr_type *type)
1972 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1973 if (type->family == NFPROTO_UNSPEC)
1974 list_add_tail_rcu(&type->list, &nf_tables_expressions);
1976 list_add_rcu(&type->list, &nf_tables_expressions);
1977 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1980 EXPORT_SYMBOL_GPL(nft_register_expr);
1983 * nft_unregister_expr - unregister nf_tables expr type
1986 * Unregisters the expr typefor use with nf_tables.
1988 void nft_unregister_expr(struct nft_expr_type *type)
1990 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1991 list_del_rcu(&type->list);
1992 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1994 EXPORT_SYMBOL_GPL(nft_unregister_expr);
1996 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
1999 const struct nft_expr_type *type;
2001 list_for_each_entry(type, &nf_tables_expressions, list) {
2002 if (!nla_strcmp(nla, type->name) &&
2003 (!type->family || type->family == family))
2009 static const struct nft_expr_type *nft_expr_type_get(struct net *net,
2013 const struct nft_expr_type *type;
2016 return ERR_PTR(-EINVAL);
2018 type = __nft_expr_type_get(family, nla);
2019 if (type != NULL && try_module_get(type->owner))
2022 lockdep_nfnl_nft_mutex_not_held();
2023 #ifdef CONFIG_MODULES
2025 nft_request_module(net, "nft-expr-%u-%.*s", family,
2026 nla_len(nla), (char *)nla_data(nla));
2027 if (__nft_expr_type_get(family, nla))
2028 return ERR_PTR(-EAGAIN);
2030 nft_request_module(net, "nft-expr-%.*s",
2031 nla_len(nla), (char *)nla_data(nla));
2032 if (__nft_expr_type_get(family, nla))
2033 return ERR_PTR(-EAGAIN);
2036 return ERR_PTR(-ENOENT);
2039 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
2040 [NFTA_EXPR_NAME] = { .type = NLA_STRING,
2041 .len = NFT_MODULE_AUTOLOAD_LIMIT },
2042 [NFTA_EXPR_DATA] = { .type = NLA_NESTED },
2045 static int nf_tables_fill_expr_info(struct sk_buff *skb,
2046 const struct nft_expr *expr)
2048 if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
2049 goto nla_put_failure;
2051 if (expr->ops->dump) {
2052 struct nlattr *data = nla_nest_start(skb, NFTA_EXPR_DATA);
2054 goto nla_put_failure;
2055 if (expr->ops->dump(skb, expr) < 0)
2056 goto nla_put_failure;
2057 nla_nest_end(skb, data);
2066 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
2067 const struct nft_expr *expr)
2069 struct nlattr *nest;
2071 nest = nla_nest_start(skb, attr);
2073 goto nla_put_failure;
2074 if (nf_tables_fill_expr_info(skb, expr) < 0)
2075 goto nla_put_failure;
2076 nla_nest_end(skb, nest);
2083 struct nft_expr_info {
2084 const struct nft_expr_ops *ops;
2085 struct nlattr *tb[NFT_EXPR_MAXATTR + 1];
2088 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
2089 const struct nlattr *nla,
2090 struct nft_expr_info *info)
2092 const struct nft_expr_type *type;
2093 const struct nft_expr_ops *ops;
2094 struct nlattr *tb[NFTA_EXPR_MAX + 1];
2097 err = nla_parse_nested(tb, NFTA_EXPR_MAX, nla, nft_expr_policy, NULL);
2101 type = nft_expr_type_get(ctx->net, ctx->family, tb[NFTA_EXPR_NAME]);
2103 return PTR_ERR(type);
2105 if (tb[NFTA_EXPR_DATA]) {
2106 err = nla_parse_nested(info->tb, type->maxattr,
2107 tb[NFTA_EXPR_DATA], type->policy, NULL);
2111 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
2113 if (type->select_ops != NULL) {
2114 ops = type->select_ops(ctx,
2115 (const struct nlattr * const *)info->tb);
2127 module_put(type->owner);
2131 static int nf_tables_newexpr(const struct nft_ctx *ctx,
2132 const struct nft_expr_info *info,
2133 struct nft_expr *expr)
2135 const struct nft_expr_ops *ops = info->ops;
2140 err = ops->init(ctx, expr, (const struct nlattr **)info->tb);
2151 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
2152 struct nft_expr *expr)
2154 const struct nft_expr_type *type = expr->ops->type;
2156 if (expr->ops->destroy)
2157 expr->ops->destroy(ctx, expr);
2158 module_put(type->owner);
2161 struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
2162 const struct nlattr *nla)
2164 struct nft_expr_info info;
2165 struct nft_expr *expr;
2166 struct module *owner;
2169 err = nf_tables_expr_parse(ctx, nla, &info);
2171 goto err_expr_parse;
2174 if (!(info.ops->type->flags & NFT_EXPR_STATEFUL))
2175 goto err_expr_stateful;
2178 expr = kzalloc(info.ops->size, GFP_KERNEL);
2180 goto err_expr_stateful;
2182 err = nf_tables_newexpr(ctx, &info, expr);
2190 owner = info.ops->type->owner;
2191 if (info.ops->type->release_ops)
2192 info.ops->type->release_ops(info.ops);
2196 return ERR_PTR(err);
2199 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
2201 nf_tables_expr_destroy(ctx, expr);
2209 static struct nft_rule *__nft_rule_lookup(const struct nft_chain *chain,
2212 struct nft_rule *rule;
2214 // FIXME: this sucks
2215 list_for_each_entry_rcu(rule, &chain->rules, list) {
2216 if (handle == rule->handle)
2220 return ERR_PTR(-ENOENT);
2223 static struct nft_rule *nft_rule_lookup(const struct nft_chain *chain,
2224 const struct nlattr *nla)
2227 return ERR_PTR(-EINVAL);
2229 return __nft_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
2232 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
2233 [NFTA_RULE_TABLE] = { .type = NLA_STRING,
2234 .len = NFT_TABLE_MAXNAMELEN - 1 },
2235 [NFTA_RULE_CHAIN] = { .type = NLA_STRING,
2236 .len = NFT_CHAIN_MAXNAMELEN - 1 },
2237 [NFTA_RULE_HANDLE] = { .type = NLA_U64 },
2238 [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
2239 [NFTA_RULE_COMPAT] = { .type = NLA_NESTED },
2240 [NFTA_RULE_POSITION] = { .type = NLA_U64 },
2241 [NFTA_RULE_USERDATA] = { .type = NLA_BINARY,
2242 .len = NFT_USERDATA_MAXLEN },
2243 [NFTA_RULE_ID] = { .type = NLA_U32 },
2246 static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
2247 u32 portid, u32 seq, int event,
2248 u32 flags, int family,
2249 const struct nft_table *table,
2250 const struct nft_chain *chain,
2251 const struct nft_rule *rule)
2253 struct nlmsghdr *nlh;
2254 struct nfgenmsg *nfmsg;
2255 const struct nft_expr *expr, *next;
2256 struct nlattr *list;
2257 const struct nft_rule *prule;
2258 u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
2260 nlh = nlmsg_put(skb, portid, seq, type, sizeof(struct nfgenmsg), flags);
2262 goto nla_put_failure;
2264 nfmsg = nlmsg_data(nlh);
2265 nfmsg->nfgen_family = family;
2266 nfmsg->version = NFNETLINK_V0;
2267 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
2269 if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
2270 goto nla_put_failure;
2271 if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
2272 goto nla_put_failure;
2273 if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
2275 goto nla_put_failure;
2277 if ((event != NFT_MSG_DELRULE) && (rule->list.prev != &chain->rules)) {
2278 prule = list_prev_entry(rule, list);
2279 if (nla_put_be64(skb, NFTA_RULE_POSITION,
2280 cpu_to_be64(prule->handle),
2282 goto nla_put_failure;
2285 list = nla_nest_start(skb, NFTA_RULE_EXPRESSIONS);
2287 goto nla_put_failure;
2288 nft_rule_for_each_expr(expr, next, rule) {
2289 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
2290 goto nla_put_failure;
2292 nla_nest_end(skb, list);
2295 struct nft_userdata *udata = nft_userdata(rule);
2296 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
2298 goto nla_put_failure;
2301 nlmsg_end(skb, nlh);
2305 nlmsg_trim(skb, nlh);
2309 static void nf_tables_rule_notify(const struct nft_ctx *ctx,
2310 const struct nft_rule *rule, int event)
2312 struct sk_buff *skb;
2316 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
2319 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
2323 err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
2324 event, 0, ctx->family, ctx->table,
2331 nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
2332 ctx->report, GFP_KERNEL);
2335 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
2338 struct nft_rule_dump_ctx {
2343 static int nf_tables_dump_rules(struct sk_buff *skb,
2344 struct netlink_callback *cb)
2346 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
2347 const struct nft_rule_dump_ctx *ctx = cb->data;
2348 const struct nft_table *table;
2349 const struct nft_chain *chain;
2350 const struct nft_rule *rule;
2351 unsigned int idx = 0, s_idx = cb->args[0];
2352 struct net *net = sock_net(skb->sk);
2353 int family = nfmsg->nfgen_family;
2356 cb->seq = net->nft.base_seq;
2358 list_for_each_entry_rcu(table, &net->nft.tables, list) {
2359 if (family != NFPROTO_UNSPEC && family != table->family)
2362 if (ctx && ctx->table && strcmp(ctx->table, table->name) != 0)
2365 list_for_each_entry_rcu(chain, &table->chains, list) {
2366 if (ctx && ctx->chain &&
2367 strcmp(ctx->chain, chain->name) != 0)
2370 list_for_each_entry_rcu(rule, &chain->rules, list) {
2371 if (!nft_is_active(net, rule))
2376 memset(&cb->args[1], 0,
2377 sizeof(cb->args) - sizeof(cb->args[0]));
2378 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
2381 NLM_F_MULTI | NLM_F_APPEND,
2383 table, chain, rule) < 0)
2386 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
2399 static int nf_tables_dump_rules_start(struct netlink_callback *cb)
2401 const struct nlattr * const *nla = cb->data;
2402 struct nft_rule_dump_ctx *ctx = NULL;
2404 if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) {
2405 ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
2409 if (nla[NFTA_RULE_TABLE]) {
2410 ctx->table = nla_strdup(nla[NFTA_RULE_TABLE],
2417 if (nla[NFTA_RULE_CHAIN]) {
2418 ctx->chain = nla_strdup(nla[NFTA_RULE_CHAIN],
2432 static int nf_tables_dump_rules_done(struct netlink_callback *cb)
2434 struct nft_rule_dump_ctx *ctx = cb->data;
2444 /* called with rcu_read_lock held */
2445 static int nf_tables_getrule(struct net *net, struct sock *nlsk,
2446 struct sk_buff *skb, const struct nlmsghdr *nlh,
2447 const struct nlattr * const nla[],
2448 struct netlink_ext_ack *extack)
2450 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2451 u8 genmask = nft_genmask_cur(net);
2452 const struct nft_chain *chain;
2453 const struct nft_rule *rule;
2454 struct nft_table *table;
2455 struct sk_buff *skb2;
2456 int family = nfmsg->nfgen_family;
2459 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2460 struct netlink_dump_control c = {
2461 .start= nf_tables_dump_rules_start,
2462 .dump = nf_tables_dump_rules,
2463 .done = nf_tables_dump_rules_done,
2464 .module = THIS_MODULE,
2465 .data = (void *)nla,
2468 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
2471 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask);
2472 if (IS_ERR(table)) {
2473 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
2474 return PTR_ERR(table);
2477 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask);
2478 if (IS_ERR(chain)) {
2479 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
2480 return PTR_ERR(chain);
2483 rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
2485 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
2486 return PTR_ERR(rule);
2489 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
2493 err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
2494 nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
2495 family, table, chain, rule);
2497 goto err_fill_rule_info;
2499 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
2506 static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
2507 struct nft_rule *rule)
2509 struct nft_expr *expr, *next;
2511 lockdep_assert_held(&ctx->net->nft.commit_mutex);
2513 * Careful: some expressions might not be initialized in case this
2514 * is called on error from nf_tables_newrule().
2516 expr = nft_expr_first(rule);
2517 while (expr != nft_expr_last(rule) && expr->ops) {
2518 next = nft_expr_next(expr);
2519 nf_tables_expr_destroy(ctx, expr);
2525 static void nf_tables_rule_release(const struct nft_ctx *ctx,
2526 struct nft_rule *rule)
2528 nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_RELEASE);
2529 nf_tables_rule_destroy(ctx, rule);
2532 int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain)
2534 struct nft_expr *expr, *last;
2535 const struct nft_data *data;
2536 struct nft_rule *rule;
2539 if (ctx->level == NFT_JUMP_STACK_SIZE)
2542 list_for_each_entry(rule, &chain->rules, list) {
2543 if (!nft_is_active_next(ctx->net, rule))
2546 nft_rule_for_each_expr(expr, last, rule) {
2547 if (!expr->ops->validate)
2550 err = expr->ops->validate(ctx, expr, &data);
2558 EXPORT_SYMBOL_GPL(nft_chain_validate);
2560 static int nft_table_validate(struct net *net, const struct nft_table *table)
2562 struct nft_chain *chain;
2563 struct nft_ctx ctx = {
2565 .family = table->family,
2569 list_for_each_entry(chain, &table->chains, list) {
2570 if (!nft_is_base_chain(chain))
2574 err = nft_chain_validate(&ctx, chain);
2582 #define NFT_RULE_MAXEXPRS 128
2584 static int nf_tables_newrule(struct net *net, struct sock *nlsk,
2585 struct sk_buff *skb, const struct nlmsghdr *nlh,
2586 const struct nlattr * const nla[],
2587 struct netlink_ext_ack *extack)
2589 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2590 u8 genmask = nft_genmask_next(net);
2591 struct nft_expr_info *info = NULL;
2592 int family = nfmsg->nfgen_family;
2593 struct nft_table *table;
2594 struct nft_chain *chain;
2595 struct nft_rule *rule, *old_rule = NULL;
2596 struct nft_userdata *udata;
2597 struct nft_trans *trans = NULL;
2598 struct nft_expr *expr;
2601 unsigned int size, i, n, ulen = 0, usize = 0;
2603 u64 handle, pos_handle;
2605 lockdep_assert_held(&net->nft.commit_mutex);
2607 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask);
2608 if (IS_ERR(table)) {
2609 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
2610 return PTR_ERR(table);
2613 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask);
2614 if (IS_ERR(chain)) {
2615 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
2616 return PTR_ERR(chain);
2619 if (nla[NFTA_RULE_HANDLE]) {
2620 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
2621 rule = __nft_rule_lookup(chain, handle);
2623 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
2624 return PTR_ERR(rule);
2627 if (nlh->nlmsg_flags & NLM_F_EXCL) {
2628 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
2631 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2636 if (!(nlh->nlmsg_flags & NLM_F_CREATE) ||
2637 nlh->nlmsg_flags & NLM_F_REPLACE)
2639 handle = nf_tables_alloc_handle(table);
2641 if (chain->use == UINT_MAX)
2644 if (nla[NFTA_RULE_POSITION]) {
2645 pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
2646 old_rule = __nft_rule_lookup(chain, pos_handle);
2647 if (IS_ERR(old_rule)) {
2648 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION]);
2649 return PTR_ERR(old_rule);
2654 nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
2658 if (nla[NFTA_RULE_EXPRESSIONS]) {
2659 info = kvmalloc_array(NFT_RULE_MAXEXPRS,
2660 sizeof(struct nft_expr_info),
2665 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
2667 if (nla_type(tmp) != NFTA_LIST_ELEM)
2669 if (n == NFT_RULE_MAXEXPRS)
2671 err = nf_tables_expr_parse(&ctx, tmp, &info[n]);
2674 size += info[n].ops->size;
2678 /* Check for overflow of dlen field */
2680 if (size >= 1 << 12)
2683 if (nla[NFTA_RULE_USERDATA]) {
2684 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
2686 usize = sizeof(struct nft_userdata) + ulen;
2690 rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL);
2694 nft_activate_next(net, rule);
2696 rule->handle = handle;
2698 rule->udata = ulen ? 1 : 0;
2701 udata = nft_userdata(rule);
2702 udata->len = ulen - 1;
2703 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
2706 expr = nft_expr_first(rule);
2707 for (i = 0; i < n; i++) {
2708 err = nf_tables_newexpr(&ctx, &info[i], expr);
2712 if (info[i].ops->validate)
2713 nft_validate_state_update(net, NFT_VALIDATE_NEED);
2716 expr = nft_expr_next(expr);
2719 if (nlh->nlmsg_flags & NLM_F_REPLACE) {
2720 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
2721 if (trans == NULL) {
2725 err = nft_delrule(&ctx, old_rule);
2727 nft_trans_destroy(trans);
2731 list_add_tail_rcu(&rule->list, &old_rule->list);
2733 if (nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule) == NULL) {
2738 if (nlh->nlmsg_flags & NLM_F_APPEND) {
2740 list_add_rcu(&rule->list, &old_rule->list);
2742 list_add_tail_rcu(&rule->list, &chain->rules);
2745 list_add_tail_rcu(&rule->list, &old_rule->list);
2747 list_add_rcu(&rule->list, &chain->rules);
2753 if (net->nft.validate_state == NFT_VALIDATE_DO)
2754 return nft_table_validate(net, table);
2758 nf_tables_rule_release(&ctx, rule);
2760 for (i = 0; i < n; i++) {
2762 module_put(info[i].ops->type->owner);
2763 if (info[i].ops->type->release_ops)
2764 info[i].ops->type->release_ops(info[i].ops);
2771 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
2772 const struct nft_chain *chain,
2773 const struct nlattr *nla)
2775 u32 id = ntohl(nla_get_be32(nla));
2776 struct nft_trans *trans;
2778 list_for_each_entry(trans, &net->nft.commit_list, list) {
2779 struct nft_rule *rule = nft_trans_rule(trans);
2781 if (trans->msg_type == NFT_MSG_NEWRULE &&
2782 trans->ctx.chain == chain &&
2783 id == nft_trans_rule_id(trans))
2786 return ERR_PTR(-ENOENT);
2789 static int nf_tables_delrule(struct net *net, struct sock *nlsk,
2790 struct sk_buff *skb, const struct nlmsghdr *nlh,
2791 const struct nlattr * const nla[],
2792 struct netlink_ext_ack *extack)
2794 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2795 u8 genmask = nft_genmask_next(net);
2796 struct nft_table *table;
2797 struct nft_chain *chain = NULL;
2798 struct nft_rule *rule;
2799 int family = nfmsg->nfgen_family, err = 0;
2802 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask);
2803 if (IS_ERR(table)) {
2804 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
2805 return PTR_ERR(table);
2808 if (nla[NFTA_RULE_CHAIN]) {
2809 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
2811 if (IS_ERR(chain)) {
2812 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
2813 return PTR_ERR(chain);
2817 nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
2820 if (nla[NFTA_RULE_HANDLE]) {
2821 rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
2823 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
2824 return PTR_ERR(rule);
2827 err = nft_delrule(&ctx, rule);
2828 } else if (nla[NFTA_RULE_ID]) {
2829 rule = nft_rule_lookup_byid(net, chain, nla[NFTA_RULE_ID]);
2831 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_ID]);
2832 return PTR_ERR(rule);
2835 err = nft_delrule(&ctx, rule);
2837 err = nft_delrule_by_chain(&ctx);
2840 list_for_each_entry(chain, &table->chains, list) {
2841 if (!nft_is_active_next(net, chain))
2845 err = nft_delrule_by_chain(&ctx);
2858 static LIST_HEAD(nf_tables_set_types);
2860 int nft_register_set(struct nft_set_type *type)
2862 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2863 list_add_tail_rcu(&type->list, &nf_tables_set_types);
2864 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2867 EXPORT_SYMBOL_GPL(nft_register_set);
2869 void nft_unregister_set(struct nft_set_type *type)
2871 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2872 list_del_rcu(&type->list);
2873 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2875 EXPORT_SYMBOL_GPL(nft_unregister_set);
2877 #define NFT_SET_FEATURES (NFT_SET_INTERVAL | NFT_SET_MAP | \
2878 NFT_SET_TIMEOUT | NFT_SET_OBJECT | \
2881 static bool nft_set_ops_candidate(const struct nft_set_type *type, u32 flags)
2883 return (flags & type->features) == (flags & NFT_SET_FEATURES);
2887 * Select a set implementation based on the data characteristics and the
2888 * given policy. The total memory use might not be known if no size is
2889 * given, in that case the amount of memory per element is used.
2891 static const struct nft_set_ops *
2892 nft_select_set_ops(const struct nft_ctx *ctx,
2893 const struct nlattr * const nla[],
2894 const struct nft_set_desc *desc,
2895 enum nft_set_policies policy)
2897 const struct nft_set_ops *ops, *bops;
2898 struct nft_set_estimate est, best;
2899 const struct nft_set_type *type;
2902 lockdep_assert_held(&ctx->net->nft.commit_mutex);
2903 lockdep_nfnl_nft_mutex_not_held();
2904 #ifdef CONFIG_MODULES
2905 if (list_empty(&nf_tables_set_types)) {
2906 nft_request_module(ctx->net, "nft-set");
2907 if (!list_empty(&nf_tables_set_types))
2908 return ERR_PTR(-EAGAIN);
2911 if (nla[NFTA_SET_FLAGS] != NULL)
2912 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
2919 list_for_each_entry(type, &nf_tables_set_types, list) {
2922 if (!nft_set_ops_candidate(type, flags))
2924 if (!ops->estimate(desc, flags, &est))
2928 case NFT_SET_POL_PERFORMANCE:
2929 if (est.lookup < best.lookup)
2931 if (est.lookup == best.lookup &&
2932 est.space < best.space)
2935 case NFT_SET_POL_MEMORY:
2937 if (est.space < best.space)
2939 if (est.space == best.space &&
2940 est.lookup < best.lookup)
2942 } else if (est.size < best.size || !bops) {
2950 if (!try_module_get(type->owner))
2953 module_put(to_set_type(bops)->owner);
2962 return ERR_PTR(-EOPNOTSUPP);
2965 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
2966 [NFTA_SET_TABLE] = { .type = NLA_STRING,
2967 .len = NFT_TABLE_MAXNAMELEN - 1 },
2968 [NFTA_SET_NAME] = { .type = NLA_STRING,
2969 .len = NFT_SET_MAXNAMELEN - 1 },
2970 [NFTA_SET_FLAGS] = { .type = NLA_U32 },
2971 [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 },
2972 [NFTA_SET_KEY_LEN] = { .type = NLA_U32 },
2973 [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 },
2974 [NFTA_SET_DATA_LEN] = { .type = NLA_U32 },
2975 [NFTA_SET_POLICY] = { .type = NLA_U32 },
2976 [NFTA_SET_DESC] = { .type = NLA_NESTED },
2977 [NFTA_SET_ID] = { .type = NLA_U32 },
2978 [NFTA_SET_TIMEOUT] = { .type = NLA_U64 },
2979 [NFTA_SET_GC_INTERVAL] = { .type = NLA_U32 },
2980 [NFTA_SET_USERDATA] = { .type = NLA_BINARY,
2981 .len = NFT_USERDATA_MAXLEN },
2982 [NFTA_SET_OBJ_TYPE] = { .type = NLA_U32 },
2983 [NFTA_SET_HANDLE] = { .type = NLA_U64 },
2986 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
2987 [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 },
2990 static int nft_ctx_init_from_setattr(struct nft_ctx *ctx, struct net *net,
2991 const struct sk_buff *skb,
2992 const struct nlmsghdr *nlh,
2993 const struct nlattr * const nla[],
2994 struct netlink_ext_ack *extack,
2997 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2998 int family = nfmsg->nfgen_family;
2999 struct nft_table *table = NULL;
3001 if (nla[NFTA_SET_TABLE] != NULL) {
3002 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
3004 if (IS_ERR(table)) {
3005 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
3006 return PTR_ERR(table);
3010 nft_ctx_init(ctx, net, skb, nlh, family, table, NULL, nla);
3014 static struct nft_set *nft_set_lookup(const struct nft_table *table,
3015 const struct nlattr *nla, u8 genmask)
3017 struct nft_set *set;
3020 return ERR_PTR(-EINVAL);
3022 list_for_each_entry_rcu(set, &table->sets, list) {
3023 if (!nla_strcmp(nla, set->name) &&
3024 nft_active_genmask(set, genmask))
3027 return ERR_PTR(-ENOENT);
3030 static struct nft_set *nft_set_lookup_byhandle(const struct nft_table *table,
3031 const struct nlattr *nla,
3034 struct nft_set *set;
3036 list_for_each_entry(set, &table->sets, list) {
3037 if (be64_to_cpu(nla_get_be64(nla)) == set->handle &&
3038 nft_active_genmask(set, genmask))
3041 return ERR_PTR(-ENOENT);
3044 static struct nft_set *nft_set_lookup_byid(const struct net *net,
3045 const struct nft_table *table,
3046 const struct nlattr *nla, u8 genmask)
3048 struct nft_trans *trans;
3049 u32 id = ntohl(nla_get_be32(nla));
3051 list_for_each_entry(trans, &net->nft.commit_list, list) {
3052 if (trans->msg_type == NFT_MSG_NEWSET) {
3053 struct nft_set *set = nft_trans_set(trans);
3055 if (id == nft_trans_set_id(trans) &&
3056 set->table == table &&
3057 nft_active_genmask(set, genmask))
3061 return ERR_PTR(-ENOENT);
3064 struct nft_set *nft_set_lookup_global(const struct net *net,
3065 const struct nft_table *table,
3066 const struct nlattr *nla_set_name,
3067 const struct nlattr *nla_set_id,
3070 struct nft_set *set;
3072 set = nft_set_lookup(table, nla_set_name, genmask);
3077 set = nft_set_lookup_byid(net, table, nla_set_id, genmask);
3081 EXPORT_SYMBOL_GPL(nft_set_lookup_global);
3083 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
3086 const struct nft_set *i;
3088 unsigned long *inuse;
3089 unsigned int n = 0, min = 0;
3091 p = strchr(name, '%');
3093 if (p[1] != 'd' || strchr(p + 2, '%'))
3096 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
3100 list_for_each_entry(i, &ctx->table->sets, list) {
3103 if (!nft_is_active_next(ctx->net, i))
3105 if (!sscanf(i->name, name, &tmp))
3107 if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
3110 set_bit(tmp - min, inuse);
3113 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
3114 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
3115 min += BITS_PER_BYTE * PAGE_SIZE;
3116 memset(inuse, 0, PAGE_SIZE);
3119 free_page((unsigned long)inuse);
3122 set->name = kasprintf(GFP_KERNEL, name, min + n);
3126 list_for_each_entry(i, &ctx->table->sets, list) {
3127 if (!nft_is_active_next(ctx->net, i))
3129 if (!strcmp(set->name, i->name)) {
3137 static int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result)
3139 u64 ms = be64_to_cpu(nla_get_be64(nla));
3140 u64 max = (u64)(~((u64)0));
3142 max = div_u64(max, NSEC_PER_MSEC);
3146 ms *= NSEC_PER_MSEC;
3147 *result = nsecs_to_jiffies64(ms);
3151 static __be64 nf_jiffies64_to_msecs(u64 input)
3153 u64 ms = jiffies64_to_nsecs(input);
3155 return cpu_to_be64(div_u64(ms, NSEC_PER_MSEC));
3158 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
3159 const struct nft_set *set, u16 event, u16 flags)
3161 struct nfgenmsg *nfmsg;
3162 struct nlmsghdr *nlh;
3163 struct nlattr *desc;
3164 u32 portid = ctx->portid;
3167 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
3168 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3171 goto nla_put_failure;
3173 nfmsg = nlmsg_data(nlh);
3174 nfmsg->nfgen_family = ctx->family;
3175 nfmsg->version = NFNETLINK_V0;
3176 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
3178 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
3179 goto nla_put_failure;
3180 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
3181 goto nla_put_failure;
3182 if (nla_put_be64(skb, NFTA_SET_HANDLE, cpu_to_be64(set->handle),
3184 goto nla_put_failure;
3185 if (set->flags != 0)
3186 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
3187 goto nla_put_failure;
3189 if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
3190 goto nla_put_failure;
3191 if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
3192 goto nla_put_failure;
3193 if (set->flags & NFT_SET_MAP) {
3194 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
3195 goto nla_put_failure;
3196 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
3197 goto nla_put_failure;
3199 if (set->flags & NFT_SET_OBJECT &&
3200 nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
3201 goto nla_put_failure;
3204 nla_put_be64(skb, NFTA_SET_TIMEOUT,
3205 nf_jiffies64_to_msecs(set->timeout),
3207 goto nla_put_failure;
3209 nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(set->gc_int)))
3210 goto nla_put_failure;
3212 if (set->policy != NFT_SET_POL_PERFORMANCE) {
3213 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
3214 goto nla_put_failure;
3218 nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
3219 goto nla_put_failure;
3221 desc = nla_nest_start(skb, NFTA_SET_DESC);
3223 goto nla_put_failure;
3225 nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
3226 goto nla_put_failure;
3227 nla_nest_end(skb, desc);
3229 nlmsg_end(skb, nlh);
3233 nlmsg_trim(skb, nlh);
3237 static void nf_tables_set_notify(const struct nft_ctx *ctx,
3238 const struct nft_set *set, int event,
3241 struct sk_buff *skb;
3242 u32 portid = ctx->portid;
3246 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
3249 skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
3253 err = nf_tables_fill_set(skb, ctx, set, event, 0);
3259 nfnetlink_send(skb, ctx->net, portid, NFNLGRP_NFTABLES, ctx->report,
3263 nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
3266 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
3268 const struct nft_set *set;
3269 unsigned int idx, s_idx = cb->args[0];
3270 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
3271 struct net *net = sock_net(skb->sk);
3272 struct nft_ctx *ctx = cb->data, ctx_set;
3278 cb->seq = net->nft.base_seq;
3280 list_for_each_entry_rcu(table, &net->nft.tables, list) {
3281 if (ctx->family != NFPROTO_UNSPEC &&
3282 ctx->family != table->family)
3285 if (ctx->table && ctx->table != table)
3289 if (cur_table != table)
3295 list_for_each_entry_rcu(set, &table->sets, list) {
3298 if (!nft_is_active(net, set))
3302 ctx_set.table = table;
3303 ctx_set.family = table->family;
3305 if (nf_tables_fill_set(skb, &ctx_set, set,
3309 cb->args[2] = (unsigned long) table;
3312 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3325 static int nf_tables_dump_sets_start(struct netlink_callback *cb)
3327 struct nft_ctx *ctx_dump = NULL;
3329 ctx_dump = kmemdup(cb->data, sizeof(*ctx_dump), GFP_ATOMIC);
3330 if (ctx_dump == NULL)
3333 cb->data = ctx_dump;
3337 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
3343 /* called with rcu_read_lock held */
3344 static int nf_tables_getset(struct net *net, struct sock *nlsk,
3345 struct sk_buff *skb, const struct nlmsghdr *nlh,
3346 const struct nlattr * const nla[],
3347 struct netlink_ext_ack *extack)
3349 u8 genmask = nft_genmask_cur(net);
3350 const struct nft_set *set;
3352 struct sk_buff *skb2;
3353 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3356 /* Verify existence before starting dump */
3357 err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, extack,
3362 if (nlh->nlmsg_flags & NLM_F_DUMP) {
3363 struct netlink_dump_control c = {
3364 .start = nf_tables_dump_sets_start,
3365 .dump = nf_tables_dump_sets,
3366 .done = nf_tables_dump_sets_done,
3368 .module = THIS_MODULE,
3371 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
3374 /* Only accept unspec with dump */
3375 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
3376 return -EAFNOSUPPORT;
3377 if (!nla[NFTA_SET_TABLE])
3380 set = nft_set_lookup(ctx.table, nla[NFTA_SET_NAME], genmask);
3382 return PTR_ERR(set);
3384 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
3388 err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
3390 goto err_fill_set_info;
3392 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
3399 static int nf_tables_set_desc_parse(const struct nft_ctx *ctx,
3400 struct nft_set_desc *desc,
3401 const struct nlattr *nla)
3403 struct nlattr *da[NFTA_SET_DESC_MAX + 1];
3406 err = nla_parse_nested(da, NFTA_SET_DESC_MAX, nla,
3407 nft_set_desc_policy, NULL);
3411 if (da[NFTA_SET_DESC_SIZE] != NULL)
3412 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
3417 static int nf_tables_newset(struct net *net, struct sock *nlsk,
3418 struct sk_buff *skb, const struct nlmsghdr *nlh,
3419 const struct nlattr * const nla[],
3420 struct netlink_ext_ack *extack)
3422 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3423 u8 genmask = nft_genmask_next(net);
3424 int family = nfmsg->nfgen_family;
3425 const struct nft_set_ops *ops;
3426 struct nft_table *table;
3427 struct nft_set *set;
3432 u32 ktype, dtype, flags, policy, gc_int, objtype;
3433 struct nft_set_desc desc;
3434 unsigned char *udata;
3438 if (nla[NFTA_SET_TABLE] == NULL ||
3439 nla[NFTA_SET_NAME] == NULL ||
3440 nla[NFTA_SET_KEY_LEN] == NULL ||
3441 nla[NFTA_SET_ID] == NULL)
3444 memset(&desc, 0, sizeof(desc));
3446 ktype = NFT_DATA_VALUE;
3447 if (nla[NFTA_SET_KEY_TYPE] != NULL) {
3448 ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
3449 if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
3453 desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
3454 if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
3458 if (nla[NFTA_SET_FLAGS] != NULL) {
3459 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
3460 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
3461 NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
3462 NFT_SET_MAP | NFT_SET_EVAL |
3465 /* Only one of these operations is supported */
3466 if ((flags & (NFT_SET_MAP | NFT_SET_OBJECT)) ==
3467 (NFT_SET_MAP | NFT_SET_OBJECT))
3469 if ((flags & (NFT_SET_EVAL | NFT_SET_OBJECT)) ==
3470 (NFT_SET_EVAL | NFT_SET_OBJECT))
3475 if (nla[NFTA_SET_DATA_TYPE] != NULL) {
3476 if (!(flags & NFT_SET_MAP))
3479 dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
3480 if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
3481 dtype != NFT_DATA_VERDICT)
3484 if (dtype != NFT_DATA_VERDICT) {
3485 if (nla[NFTA_SET_DATA_LEN] == NULL)
3487 desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
3488 if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
3491 desc.dlen = sizeof(struct nft_verdict);
3492 } else if (flags & NFT_SET_MAP)
3495 if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
3496 if (!(flags & NFT_SET_OBJECT))
3499 objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
3500 if (objtype == NFT_OBJECT_UNSPEC ||
3501 objtype > NFT_OBJECT_MAX)
3503 } else if (flags & NFT_SET_OBJECT)
3506 objtype = NFT_OBJECT_UNSPEC;
3509 if (nla[NFTA_SET_TIMEOUT] != NULL) {
3510 if (!(flags & NFT_SET_TIMEOUT))
3513 err = nf_msecs_to_jiffies64(nla[NFTA_SET_TIMEOUT], &timeout);
3518 if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
3519 if (!(flags & NFT_SET_TIMEOUT))
3521 gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
3524 policy = NFT_SET_POL_PERFORMANCE;
3525 if (nla[NFTA_SET_POLICY] != NULL)
3526 policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
3528 if (nla[NFTA_SET_DESC] != NULL) {
3529 err = nf_tables_set_desc_parse(&ctx, &desc, nla[NFTA_SET_DESC]);
3534 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, genmask);
3535 if (IS_ERR(table)) {
3536 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
3537 return PTR_ERR(table);
3540 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
3542 set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
3544 if (PTR_ERR(set) != -ENOENT) {
3545 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
3546 return PTR_ERR(set);
3549 if (nlh->nlmsg_flags & NLM_F_EXCL) {
3550 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
3553 if (nlh->nlmsg_flags & NLM_F_REPLACE)
3559 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
3562 ops = nft_select_set_ops(&ctx, nla, &desc, policy);
3564 return PTR_ERR(ops);
3567 if (nla[NFTA_SET_USERDATA])
3568 udlen = nla_len(nla[NFTA_SET_USERDATA]);
3571 if (ops->privsize != NULL)
3572 size = ops->privsize(nla, &desc);
3574 set = kvzalloc(sizeof(*set) + size + udlen, GFP_KERNEL);
3580 name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL);
3586 err = nf_tables_set_alloc_name(&ctx, set, name);
3593 udata = set->data + size;
3594 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
3597 INIT_LIST_HEAD(&set->bindings);
3599 write_pnet(&set->net, net);
3602 set->klen = desc.klen;
3604 set->objtype = objtype;
3605 set->dlen = desc.dlen;
3607 set->size = desc.size;
3608 set->policy = policy;
3611 set->timeout = timeout;
3612 set->gc_int = gc_int;
3613 set->handle = nf_tables_alloc_handle(table);
3615 err = ops->init(set, &desc, nla);
3619 err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
3623 list_add_tail_rcu(&set->list, &table->sets);
3634 module_put(to_set_type(ops)->owner);
3638 static void nft_set_destroy(struct nft_set *set)
3640 if (WARN_ON(set->use > 0))
3643 set->ops->destroy(set);
3644 module_put(to_set_type(set->ops)->owner);
3649 static int nf_tables_delset(struct net *net, struct sock *nlsk,
3650 struct sk_buff *skb, const struct nlmsghdr *nlh,
3651 const struct nlattr * const nla[],
3652 struct netlink_ext_ack *extack)
3654 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3655 u8 genmask = nft_genmask_next(net);
3656 const struct nlattr *attr;
3657 struct nft_set *set;
3661 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
3662 return -EAFNOSUPPORT;
3663 if (nla[NFTA_SET_TABLE] == NULL)
3666 err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, extack,
3671 if (nla[NFTA_SET_HANDLE]) {
3672 attr = nla[NFTA_SET_HANDLE];
3673 set = nft_set_lookup_byhandle(ctx.table, attr, genmask);
3675 attr = nla[NFTA_SET_NAME];
3676 set = nft_set_lookup(ctx.table, attr, genmask);
3680 NL_SET_BAD_ATTR(extack, attr);
3681 return PTR_ERR(set);
3684 (nlh->nlmsg_flags & NLM_F_NONREC && atomic_read(&set->nelems) > 0)) {
3685 NL_SET_BAD_ATTR(extack, attr);
3689 return nft_delset(&ctx, set);
3692 static int nft_validate_register_store(const struct nft_ctx *ctx,
3693 enum nft_registers reg,
3694 const struct nft_data *data,
3695 enum nft_data_types type,
3698 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
3699 struct nft_set *set,
3700 const struct nft_set_iter *iter,
3701 struct nft_set_elem *elem)
3703 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
3704 enum nft_registers dreg;
3706 dreg = nft_type_to_reg(set->dtype);
3707 return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
3708 set->dtype == NFT_DATA_VERDICT ?
3709 NFT_DATA_VERDICT : NFT_DATA_VALUE,
3713 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
3714 struct nft_set_binding *binding)
3716 struct nft_set_binding *i;
3717 struct nft_set_iter iter;
3719 if (set->use == UINT_MAX)
3722 if (!list_empty(&set->bindings) && nft_set_is_anonymous(set))
3725 if (binding->flags & NFT_SET_MAP) {
3726 /* If the set is already bound to the same chain all
3727 * jumps are already validated for that chain.
3729 list_for_each_entry(i, &set->bindings, list) {
3730 if (i->flags & NFT_SET_MAP &&
3731 i->chain == binding->chain)
3735 iter.genmask = nft_genmask_next(ctx->net);
3739 iter.fn = nf_tables_bind_check_setelem;
3741 set->ops->walk(ctx, set, &iter);
3746 binding->chain = ctx->chain;
3747 list_add_tail_rcu(&binding->list, &set->bindings);
3748 nft_set_trans_bind(ctx, set);
3753 EXPORT_SYMBOL_GPL(nf_tables_bind_set);
3755 void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
3756 struct nft_set_binding *binding, bool event)
3758 list_del_rcu(&binding->list);
3760 if (list_empty(&set->bindings) && nft_set_is_anonymous(set)) {
3761 list_del_rcu(&set->list);
3763 nf_tables_set_notify(ctx, set, NFT_MSG_DELSET,
3767 EXPORT_SYMBOL_GPL(nf_tables_unbind_set);
3769 void nf_tables_activate_set(const struct nft_ctx *ctx, struct nft_set *set)
3771 if (nft_set_is_anonymous(set))
3772 nft_clear(ctx->net, set);
3776 EXPORT_SYMBOL_GPL(nf_tables_activate_set);
3778 void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set,
3779 struct nft_set_binding *binding,
3780 enum nft_trans_phase phase)
3783 case NFT_TRANS_PREPARE:
3784 if (nft_set_is_anonymous(set))
3785 nft_deactivate_next(ctx->net, set);
3789 case NFT_TRANS_ABORT:
3790 case NFT_TRANS_RELEASE:
3794 nf_tables_unbind_set(ctx, set, binding,
3795 phase == NFT_TRANS_COMMIT);
3798 EXPORT_SYMBOL_GPL(nf_tables_deactivate_set);
3800 void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set)
3802 if (list_empty(&set->bindings) && nft_set_is_anonymous(set))
3803 nft_set_destroy(set);
3805 EXPORT_SYMBOL_GPL(nf_tables_destroy_set);
3807 const struct nft_set_ext_type nft_set_ext_types[] = {
3808 [NFT_SET_EXT_KEY] = {
3809 .align = __alignof__(u32),
3811 [NFT_SET_EXT_DATA] = {
3812 .align = __alignof__(u32),
3814 [NFT_SET_EXT_EXPR] = {
3815 .align = __alignof__(struct nft_expr),
3817 [NFT_SET_EXT_OBJREF] = {
3818 .len = sizeof(struct nft_object *),
3819 .align = __alignof__(struct nft_object *),
3821 [NFT_SET_EXT_FLAGS] = {
3823 .align = __alignof__(u8),
3825 [NFT_SET_EXT_TIMEOUT] = {
3827 .align = __alignof__(u64),
3829 [NFT_SET_EXT_EXPIRATION] = {
3831 .align = __alignof__(u64),
3833 [NFT_SET_EXT_USERDATA] = {
3834 .len = sizeof(struct nft_userdata),
3835 .align = __alignof__(struct nft_userdata),
3838 EXPORT_SYMBOL_GPL(nft_set_ext_types);
3844 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
3845 [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED },
3846 [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED },
3847 [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 },
3848 [NFTA_SET_ELEM_TIMEOUT] = { .type = NLA_U64 },
3849 [NFTA_SET_ELEM_USERDATA] = { .type = NLA_BINARY,
3850 .len = NFT_USERDATA_MAXLEN },
3851 [NFTA_SET_ELEM_EXPR] = { .type = NLA_NESTED },
3852 [NFTA_SET_ELEM_OBJREF] = { .type = NLA_STRING,
3853 .len = NFT_OBJ_MAXNAMELEN - 1 },
3856 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
3857 [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING,
3858 .len = NFT_TABLE_MAXNAMELEN - 1 },
3859 [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING,
3860 .len = NFT_SET_MAXNAMELEN - 1 },
3861 [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED },
3862 [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 },
3865 static int nft_ctx_init_from_elemattr(struct nft_ctx *ctx, struct net *net,
3866 const struct sk_buff *skb,
3867 const struct nlmsghdr *nlh,
3868 const struct nlattr * const nla[],
3869 struct netlink_ext_ack *extack,
3872 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3873 int family = nfmsg->nfgen_family;
3874 struct nft_table *table;
3876 table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
3878 if (IS_ERR(table)) {
3879 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
3880 return PTR_ERR(table);
3883 nft_ctx_init(ctx, net, skb, nlh, family, table, NULL, nla);
3887 static int nf_tables_fill_setelem(struct sk_buff *skb,
3888 const struct nft_set *set,
3889 const struct nft_set_elem *elem)
3891 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
3892 unsigned char *b = skb_tail_pointer(skb);
3893 struct nlattr *nest;
3895 nest = nla_nest_start(skb, NFTA_LIST_ELEM);
3897 goto nla_put_failure;
3899 if (nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
3900 NFT_DATA_VALUE, set->klen) < 0)
3901 goto nla_put_failure;
3903 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
3904 nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
3905 set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
3907 goto nla_put_failure;
3909 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR) &&
3910 nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, nft_set_ext_expr(ext)) < 0)
3911 goto nla_put_failure;
3913 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
3914 nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
3915 (*nft_set_ext_obj(ext))->name) < 0)
3916 goto nla_put_failure;
3918 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
3919 nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
3920 htonl(*nft_set_ext_flags(ext))))
3921 goto nla_put_failure;
3923 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
3924 nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
3925 nf_jiffies64_to_msecs(*nft_set_ext_timeout(ext)),
3927 goto nla_put_failure;
3929 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
3930 u64 expires, now = get_jiffies_64();
3932 expires = *nft_set_ext_expiration(ext);
3933 if (time_before64(now, expires))
3938 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
3939 nf_jiffies64_to_msecs(expires),
3941 goto nla_put_failure;
3944 if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
3945 struct nft_userdata *udata;
3947 udata = nft_set_ext_userdata(ext);
3948 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
3949 udata->len + 1, udata->data))
3950 goto nla_put_failure;
3953 nla_nest_end(skb, nest);
3961 struct nft_set_dump_args {
3962 const struct netlink_callback *cb;
3963 struct nft_set_iter iter;
3964 struct sk_buff *skb;
3967 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
3968 struct nft_set *set,
3969 const struct nft_set_iter *iter,
3970 struct nft_set_elem *elem)
3972 struct nft_set_dump_args *args;
3974 args = container_of(iter, struct nft_set_dump_args, iter);
3975 return nf_tables_fill_setelem(args->skb, set, elem);
3978 struct nft_set_dump_ctx {
3979 const struct nft_set *set;
3983 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
3985 struct nft_set_dump_ctx *dump_ctx = cb->data;
3986 struct net *net = sock_net(skb->sk);
3987 struct nft_table *table;
3988 struct nft_set *set;
3989 struct nft_set_dump_args args;
3990 bool set_found = false;
3991 struct nfgenmsg *nfmsg;
3992 struct nlmsghdr *nlh;
3993 struct nlattr *nest;
3998 list_for_each_entry_rcu(table, &net->nft.tables, list) {
3999 if (dump_ctx->ctx.family != NFPROTO_UNSPEC &&
4000 dump_ctx->ctx.family != table->family)
4003 if (table != dump_ctx->ctx.table)
4006 list_for_each_entry_rcu(set, &table->sets, list) {
4007 if (set == dump_ctx->set) {
4020 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM);
4021 portid = NETLINK_CB(cb->skb).portid;
4022 seq = cb->nlh->nlmsg_seq;
4024 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
4027 goto nla_put_failure;
4029 nfmsg = nlmsg_data(nlh);
4030 nfmsg->nfgen_family = table->family;
4031 nfmsg->version = NFNETLINK_V0;
4032 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
4034 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name))
4035 goto nla_put_failure;
4036 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
4037 goto nla_put_failure;
4039 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
4041 goto nla_put_failure;
4045 args.iter.genmask = nft_genmask_cur(net);
4046 args.iter.skip = cb->args[0];
4047 args.iter.count = 0;
4049 args.iter.fn = nf_tables_dump_setelem;
4050 set->ops->walk(&dump_ctx->ctx, set, &args.iter);
4053 nla_nest_end(skb, nest);
4054 nlmsg_end(skb, nlh);
4056 if (args.iter.err && args.iter.err != -EMSGSIZE)
4057 return args.iter.err;
4058 if (args.iter.count == cb->args[0])
4061 cb->args[0] = args.iter.count;
4069 static int nf_tables_dump_set_start(struct netlink_callback *cb)
4071 struct nft_set_dump_ctx *dump_ctx = cb->data;
4073 cb->data = kmemdup(dump_ctx, sizeof(*dump_ctx), GFP_ATOMIC);
4075 return cb->data ? 0 : -ENOMEM;
4078 static int nf_tables_dump_set_done(struct netlink_callback *cb)
4084 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
4085 const struct nft_ctx *ctx, u32 seq,
4086 u32 portid, int event, u16 flags,
4087 const struct nft_set *set,
4088 const struct nft_set_elem *elem)
4090 struct nfgenmsg *nfmsg;
4091 struct nlmsghdr *nlh;
4092 struct nlattr *nest;
4095 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
4096 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
4099 goto nla_put_failure;
4101 nfmsg = nlmsg_data(nlh);
4102 nfmsg->nfgen_family = ctx->family;
4103 nfmsg->version = NFNETLINK_V0;
4104 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
4106 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
4107 goto nla_put_failure;
4108 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
4109 goto nla_put_failure;
4111 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
4113 goto nla_put_failure;
4115 err = nf_tables_fill_setelem(skb, set, elem);
4117 goto nla_put_failure;
4119 nla_nest_end(skb, nest);
4121 nlmsg_end(skb, nlh);
4125 nlmsg_trim(skb, nlh);
4129 static int nft_setelem_parse_flags(const struct nft_set *set,
4130 const struct nlattr *attr, u32 *flags)
4135 *flags = ntohl(nla_get_be32(attr));
4136 if (*flags & ~NFT_SET_ELEM_INTERVAL_END)
4138 if (!(set->flags & NFT_SET_INTERVAL) &&
4139 *flags & NFT_SET_ELEM_INTERVAL_END)
4145 static int nft_setelem_parse_key(struct nft_ctx *ctx, struct nft_set *set,
4146 struct nft_data *key, struct nlattr *attr)
4148 struct nft_data_desc desc;
4151 err = nft_data_init(ctx, key, NFT_DATA_VALUE_MAXLEN, &desc, attr);
4155 if (desc.type != NFT_DATA_VALUE || desc.len != set->klen) {
4156 nft_data_release(key, desc.type);
4163 static int nft_setelem_parse_data(struct nft_ctx *ctx, struct nft_set *set,
4164 struct nft_data_desc *desc,
4165 struct nft_data *data,
4166 struct nlattr *attr)
4171 err = nft_data_init(ctx, data, NFT_DATA_VALUE_MAXLEN, desc, attr);
4175 if (set->dtype == NFT_DATA_VERDICT)
4176 dtype = NFT_DATA_VERDICT;
4178 dtype = NFT_DATA_VALUE;
4180 if (dtype != desc->type ||
4181 set->dlen != desc->len) {
4182 nft_data_release(data, desc->type);
4189 static int nft_get_set_elem(struct nft_ctx *ctx, struct nft_set *set,
4190 const struct nlattr *attr)
4192 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
4193 struct nft_set_elem elem;
4194 struct sk_buff *skb;
4199 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
4200 nft_set_elem_policy, NULL);
4204 if (!nla[NFTA_SET_ELEM_KEY])
4207 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
4211 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
4212 nla[NFTA_SET_ELEM_KEY]);
4216 priv = set->ops->get(ctx->net, set, &elem, flags);
4218 return PTR_ERR(priv);
4223 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
4227 err = nf_tables_fill_setelem_info(skb, ctx, ctx->seq, ctx->portid,
4228 NFT_MSG_NEWSETELEM, 0, set, &elem);
4230 goto err_fill_setelem;
4232 return nfnetlink_unicast(skb, ctx->net, ctx->portid);
4239 /* called with rcu_read_lock held */
4240 static int nf_tables_getsetelem(struct net *net, struct sock *nlsk,
4241 struct sk_buff *skb, const struct nlmsghdr *nlh,
4242 const struct nlattr * const nla[],
4243 struct netlink_ext_ack *extack)
4245 u8 genmask = nft_genmask_cur(net);
4246 struct nft_set *set;
4247 struct nlattr *attr;
4251 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack,
4256 set = nft_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
4258 return PTR_ERR(set);
4260 if (nlh->nlmsg_flags & NLM_F_DUMP) {
4261 struct netlink_dump_control c = {
4262 .start = nf_tables_dump_set_start,
4263 .dump = nf_tables_dump_set,
4264 .done = nf_tables_dump_set_done,
4265 .module = THIS_MODULE,
4267 struct nft_set_dump_ctx dump_ctx = {
4273 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
4276 if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
4279 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
4280 err = nft_get_set_elem(&ctx, set, attr);
4288 static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
4289 const struct nft_set *set,
4290 const struct nft_set_elem *elem,
4291 int event, u16 flags)
4293 struct net *net = ctx->net;
4294 u32 portid = ctx->portid;
4295 struct sk_buff *skb;
4298 if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
4301 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
4305 err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
4312 nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, ctx->report,
4316 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
4319 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
4321 struct nft_set *set)
4323 struct nft_trans *trans;
4325 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
4329 nft_trans_elem_set(trans) = set;
4333 void *nft_set_elem_init(const struct nft_set *set,
4334 const struct nft_set_ext_tmpl *tmpl,
4335 const u32 *key, const u32 *data,
4336 u64 timeout, gfp_t gfp)
4338 struct nft_set_ext *ext;
4341 elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
4345 ext = nft_set_elem_ext(set, elem);
4346 nft_set_ext_init(ext, tmpl);
4348 memcpy(nft_set_ext_key(ext), key, set->klen);
4349 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
4350 memcpy(nft_set_ext_data(ext), data, set->dlen);
4351 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION))
4352 *nft_set_ext_expiration(ext) =
4353 get_jiffies_64() + timeout;
4354 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
4355 *nft_set_ext_timeout(ext) = timeout;
4360 void nft_set_elem_destroy(const struct nft_set *set, void *elem,
4363 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
4364 struct nft_ctx ctx = {
4365 .net = read_pnet(&set->net),
4366 .family = set->table->family,
4369 nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE);
4370 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
4371 nft_data_release(nft_set_ext_data(ext), set->dtype);
4372 if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPR)) {
4373 struct nft_expr *expr = nft_set_ext_expr(ext);
4375 if (expr->ops->destroy_clone) {
4376 expr->ops->destroy_clone(&ctx, expr);
4377 module_put(expr->ops->type->owner);
4379 nf_tables_expr_destroy(&ctx, expr);
4382 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
4383 (*nft_set_ext_obj(ext))->use--;
4386 EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
4388 /* Only called from commit path, nft_set_elem_deactivate() already deals with
4389 * the refcounting from the preparation phase.
4391 static void nf_tables_set_elem_destroy(const struct nft_ctx *ctx,
4392 const struct nft_set *set, void *elem)
4394 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
4396 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR))
4397 nf_tables_expr_destroy(ctx, nft_set_ext_expr(ext));
4401 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
4402 const struct nlattr *attr, u32 nlmsg_flags)
4404 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
4405 u8 genmask = nft_genmask_next(ctx->net);
4406 struct nft_set_ext_tmpl tmpl;
4407 struct nft_set_ext *ext, *ext2;
4408 struct nft_set_elem elem;
4409 struct nft_set_binding *binding;
4410 struct nft_object *obj = NULL;
4411 struct nft_userdata *udata;
4412 struct nft_data_desc desc;
4413 enum nft_registers dreg;
4414 struct nft_trans *trans;
4420 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
4421 nft_set_elem_policy, NULL);
4425 if (nla[NFTA_SET_ELEM_KEY] == NULL)
4428 nft_set_ext_prepare(&tmpl);
4430 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
4434 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
4436 if (set->flags & NFT_SET_MAP) {
4437 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
4438 !(flags & NFT_SET_ELEM_INTERVAL_END))
4441 if (nla[NFTA_SET_ELEM_DATA] != NULL)
4445 if (set->flags & NFT_SET_OBJECT) {
4446 if (!nla[NFTA_SET_ELEM_OBJREF] &&
4447 !(flags & NFT_SET_ELEM_INTERVAL_END))
4450 if (nla[NFTA_SET_ELEM_OBJREF])
4454 if ((flags & NFT_SET_ELEM_INTERVAL_END) &&
4455 (nla[NFTA_SET_ELEM_DATA] ||
4456 nla[NFTA_SET_ELEM_OBJREF] ||
4457 nla[NFTA_SET_ELEM_TIMEOUT] ||
4458 nla[NFTA_SET_ELEM_EXPIRATION] ||
4459 nla[NFTA_SET_ELEM_USERDATA] ||
4460 nla[NFTA_SET_ELEM_EXPR]))
4464 if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
4465 if (!(set->flags & NFT_SET_TIMEOUT))
4467 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_TIMEOUT],
4471 } else if (set->flags & NFT_SET_TIMEOUT) {
4472 timeout = set->timeout;
4475 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
4476 nla[NFTA_SET_ELEM_KEY]);
4480 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
4482 nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
4483 if (timeout != set->timeout)
4484 nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
4487 if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
4488 obj = nft_obj_lookup(ctx->table, nla[NFTA_SET_ELEM_OBJREF],
4489 set->objtype, genmask);
4494 nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
4497 if (nla[NFTA_SET_ELEM_DATA] != NULL) {
4498 err = nft_setelem_parse_data(ctx, set, &desc, &elem.data.val,
4499 nla[NFTA_SET_ELEM_DATA]);
4503 dreg = nft_type_to_reg(set->dtype);
4504 list_for_each_entry(binding, &set->bindings, list) {
4505 struct nft_ctx bind_ctx = {
4507 .family = ctx->family,
4508 .table = ctx->table,
4509 .chain = (struct nft_chain *)binding->chain,
4512 if (!(binding->flags & NFT_SET_MAP))
4515 err = nft_validate_register_store(&bind_ctx, dreg,
4517 desc.type, desc.len);
4521 if (desc.type == NFT_DATA_VERDICT &&
4522 (elem.data.val.verdict.code == NFT_GOTO ||
4523 elem.data.val.verdict.code == NFT_JUMP))
4524 nft_validate_state_update(ctx->net,
4528 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, desc.len);
4531 /* The full maximum length of userdata can exceed the maximum
4532 * offset value (U8_MAX) for following extensions, therefor it
4533 * must be the last extension added.
4536 if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
4537 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
4539 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
4544 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
4546 timeout, GFP_KERNEL);
4547 if (elem.priv == NULL)
4550 ext = nft_set_elem_ext(set, elem.priv);
4552 *nft_set_ext_flags(ext) = flags;
4554 udata = nft_set_ext_userdata(ext);
4555 udata->len = ulen - 1;
4556 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
4559 *nft_set_ext_obj(ext) = obj;
4563 trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
4567 ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK;
4568 err = set->ops->insert(ctx->net, set, &elem, &ext2);
4570 if (err == -EEXIST) {
4571 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^
4572 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) ||
4573 nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^
4574 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF)) {
4578 if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
4579 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
4580 memcmp(nft_set_ext_data(ext),
4581 nft_set_ext_data(ext2), set->dlen) != 0) ||
4582 (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
4583 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
4584 *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
4586 else if (!(nlmsg_flags & NLM_F_EXCL))
4593 !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact)) {
4598 nft_trans_elem(trans) = elem;
4599 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
4603 set->ops->remove(ctx->net, set, &elem);
4611 if (nla[NFTA_SET_ELEM_DATA] != NULL)
4612 nft_data_release(&elem.data.val, desc.type);
4614 nft_data_release(&elem.key.val, NFT_DATA_VALUE);
4619 static int nf_tables_newsetelem(struct net *net, struct sock *nlsk,
4620 struct sk_buff *skb, const struct nlmsghdr *nlh,
4621 const struct nlattr * const nla[],
4622 struct netlink_ext_ack *extack)
4624 u8 genmask = nft_genmask_next(net);
4625 const struct nlattr *attr;
4626 struct nft_set *set;
4630 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
4633 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack,
4638 set = nft_set_lookup_global(net, ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
4639 nla[NFTA_SET_ELEM_LIST_SET_ID], genmask);
4641 return PTR_ERR(set);
4643 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
4646 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
4647 err = nft_add_set_elem(&ctx, set, attr, nlh->nlmsg_flags);
4652 if (net->nft.validate_state == NFT_VALIDATE_DO)
4653 return nft_table_validate(net, ctx.table);
4659 * nft_data_hold - hold a nft_data item
4661 * @data: struct nft_data to release
4662 * @type: type of data
4664 * Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded,
4665 * NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and
4666 * NFT_GOTO verdicts. This function must be called on active data objects
4667 * from the second phase of the commit protocol.
4669 void nft_data_hold(const struct nft_data *data, enum nft_data_types type)
4671 if (type == NFT_DATA_VERDICT) {
4672 switch (data->verdict.code) {
4675 data->verdict.chain->use++;
4681 static void nft_set_elem_activate(const struct net *net,
4682 const struct nft_set *set,
4683 struct nft_set_elem *elem)
4685 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4687 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
4688 nft_data_hold(nft_set_ext_data(ext), set->dtype);
4689 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
4690 (*nft_set_ext_obj(ext))->use++;
4693 static void nft_set_elem_deactivate(const struct net *net,
4694 const struct nft_set *set,
4695 struct nft_set_elem *elem)
4697 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4699 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
4700 nft_data_release(nft_set_ext_data(ext), set->dtype);
4701 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
4702 (*nft_set_ext_obj(ext))->use--;
4705 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
4706 const struct nlattr *attr)
4708 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
4709 struct nft_set_ext_tmpl tmpl;
4710 struct nft_set_elem elem;
4711 struct nft_set_ext *ext;
4712 struct nft_trans *trans;
4717 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
4718 nft_set_elem_policy, NULL);
4722 if (nla[NFTA_SET_ELEM_KEY] == NULL)
4725 nft_set_ext_prepare(&tmpl);
4727 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
4731 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
4733 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
4734 nla[NFTA_SET_ELEM_KEY]);
4738 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
4741 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, NULL, 0,
4743 if (elem.priv == NULL)
4746 ext = nft_set_elem_ext(set, elem.priv);
4748 *nft_set_ext_flags(ext) = flags;
4750 trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
4754 priv = set->ops->deactivate(ctx->net, set, &elem);
4762 nft_set_elem_deactivate(ctx->net, set, &elem);
4764 nft_trans_elem(trans) = elem;
4765 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
4773 nft_data_release(&elem.key.val, NFT_DATA_VALUE);
4777 static int nft_flush_set(const struct nft_ctx *ctx,
4778 struct nft_set *set,
4779 const struct nft_set_iter *iter,
4780 struct nft_set_elem *elem)
4782 struct nft_trans *trans;
4785 trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
4786 sizeof(struct nft_trans_elem), GFP_ATOMIC);
4790 if (!set->ops->flush(ctx->net, set, elem->priv)) {
4796 nft_set_elem_deactivate(ctx->net, set, elem);
4797 nft_trans_elem_set(trans) = set;
4798 nft_trans_elem(trans) = *elem;
4799 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
4807 static int nf_tables_delsetelem(struct net *net, struct sock *nlsk,
4808 struct sk_buff *skb, const struct nlmsghdr *nlh,
4809 const struct nlattr * const nla[],
4810 struct netlink_ext_ack *extack)
4812 u8 genmask = nft_genmask_next(net);
4813 const struct nlattr *attr;
4814 struct nft_set *set;
4818 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack,
4823 set = nft_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
4825 return PTR_ERR(set);
4826 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
4829 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL) {
4830 struct nft_set_iter iter = {
4832 .fn = nft_flush_set,
4834 set->ops->walk(&ctx, set, &iter);
4839 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
4840 err = nft_del_setelem(&ctx, set, attr);
4849 void nft_set_gc_batch_release(struct rcu_head *rcu)
4851 struct nft_set_gc_batch *gcb;
4854 gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu);
4855 for (i = 0; i < gcb->head.cnt; i++)
4856 nft_set_elem_destroy(gcb->head.set, gcb->elems[i], true);
4859 EXPORT_SYMBOL_GPL(nft_set_gc_batch_release);
4861 struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
4864 struct nft_set_gc_batch *gcb;
4866 gcb = kzalloc(sizeof(*gcb), gfp);
4869 gcb->head.set = set;
4872 EXPORT_SYMBOL_GPL(nft_set_gc_batch_alloc);
4879 * nft_register_obj- register nf_tables stateful object type
4882 * Registers the object type for use with nf_tables. Returns zero on
4883 * success or a negative errno code otherwise.
4885 int nft_register_obj(struct nft_object_type *obj_type)
4887 if (obj_type->type == NFT_OBJECT_UNSPEC)
4890 nfnl_lock(NFNL_SUBSYS_NFTABLES);
4891 list_add_rcu(&obj_type->list, &nf_tables_objects);
4892 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
4895 EXPORT_SYMBOL_GPL(nft_register_obj);
4898 * nft_unregister_obj - unregister nf_tables object type
4901 * Unregisters the object type for use with nf_tables.
4903 void nft_unregister_obj(struct nft_object_type *obj_type)
4905 nfnl_lock(NFNL_SUBSYS_NFTABLES);
4906 list_del_rcu(&obj_type->list);
4907 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
4909 EXPORT_SYMBOL_GPL(nft_unregister_obj);
4911 struct nft_object *nft_obj_lookup(const struct nft_table *table,
4912 const struct nlattr *nla, u32 objtype,
4915 struct nft_object *obj;
4917 list_for_each_entry_rcu(obj, &table->objects, list) {
4918 if (!nla_strcmp(nla, obj->name) &&
4919 objtype == obj->ops->type->type &&
4920 nft_active_genmask(obj, genmask))
4923 return ERR_PTR(-ENOENT);
4925 EXPORT_SYMBOL_GPL(nft_obj_lookup);
4927 static struct nft_object *nft_obj_lookup_byhandle(const struct nft_table *table,
4928 const struct nlattr *nla,
4929 u32 objtype, u8 genmask)
4931 struct nft_object *obj;
4933 list_for_each_entry(obj, &table->objects, list) {
4934 if (be64_to_cpu(nla_get_be64(nla)) == obj->handle &&
4935 objtype == obj->ops->type->type &&
4936 nft_active_genmask(obj, genmask))
4939 return ERR_PTR(-ENOENT);
4942 static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
4943 [NFTA_OBJ_TABLE] = { .type = NLA_STRING,
4944 .len = NFT_TABLE_MAXNAMELEN - 1 },
4945 [NFTA_OBJ_NAME] = { .type = NLA_STRING,
4946 .len = NFT_OBJ_MAXNAMELEN - 1 },
4947 [NFTA_OBJ_TYPE] = { .type = NLA_U32 },
4948 [NFTA_OBJ_DATA] = { .type = NLA_NESTED },
4949 [NFTA_OBJ_HANDLE] = { .type = NLA_U64},
4952 static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,
4953 const struct nft_object_type *type,
4954 const struct nlattr *attr)
4957 const struct nft_object_ops *ops;
4958 struct nft_object *obj;
4961 tb = kmalloc_array(type->maxattr + 1, sizeof(*tb), GFP_KERNEL);
4966 err = nla_parse_nested(tb, type->maxattr, attr, type->policy,
4971 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
4974 if (type->select_ops) {
4975 ops = type->select_ops(ctx, (const struct nlattr * const *)tb);
4985 obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL);
4989 err = ops->init(ctx, (const struct nlattr * const *)tb, obj);
5002 return ERR_PTR(err);
5005 static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
5006 struct nft_object *obj, bool reset)
5008 struct nlattr *nest;
5010 nest = nla_nest_start(skb, attr);
5012 goto nla_put_failure;
5013 if (obj->ops->dump(skb, obj, reset) < 0)
5014 goto nla_put_failure;
5015 nla_nest_end(skb, nest);
5022 static const struct nft_object_type *__nft_obj_type_get(u32 objtype)
5024 const struct nft_object_type *type;
5026 list_for_each_entry(type, &nf_tables_objects, list) {
5027 if (objtype == type->type)
5033 static const struct nft_object_type *
5034 nft_obj_type_get(struct net *net, u32 objtype)
5036 const struct nft_object_type *type;
5038 type = __nft_obj_type_get(objtype);
5039 if (type != NULL && try_module_get(type->owner))
5042 lockdep_nfnl_nft_mutex_not_held();
5043 #ifdef CONFIG_MODULES
5045 nft_request_module(net, "nft-obj-%u", objtype);
5046 if (__nft_obj_type_get(objtype))
5047 return ERR_PTR(-EAGAIN);
5050 return ERR_PTR(-ENOENT);
5053 static int nf_tables_newobj(struct net *net, struct sock *nlsk,
5054 struct sk_buff *skb, const struct nlmsghdr *nlh,
5055 const struct nlattr * const nla[],
5056 struct netlink_ext_ack *extack)
5058 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
5059 const struct nft_object_type *type;
5060 u8 genmask = nft_genmask_next(net);
5061 int family = nfmsg->nfgen_family;
5062 struct nft_table *table;
5063 struct nft_object *obj;
5068 if (!nla[NFTA_OBJ_TYPE] ||
5069 !nla[NFTA_OBJ_NAME] ||
5070 !nla[NFTA_OBJ_DATA])
5073 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask);
5074 if (IS_ERR(table)) {
5075 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
5076 return PTR_ERR(table);
5079 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
5080 obj = nft_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask);
5083 if (err != -ENOENT) {
5084 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
5088 if (nlh->nlmsg_flags & NLM_F_EXCL) {
5089 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
5095 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
5097 type = nft_obj_type_get(net, objtype);
5099 return PTR_ERR(type);
5101 obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]);
5107 obj->handle = nf_tables_alloc_handle(table);
5109 obj->name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL);
5115 err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
5119 list_add_tail_rcu(&obj->list, &table->objects);
5125 if (obj->ops->destroy)
5126 obj->ops->destroy(&ctx, obj);
5129 module_put(type->owner);
5133 static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
5134 u32 portid, u32 seq, int event, u32 flags,
5135 int family, const struct nft_table *table,
5136 struct nft_object *obj, bool reset)
5138 struct nfgenmsg *nfmsg;
5139 struct nlmsghdr *nlh;
5141 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
5142 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
5144 goto nla_put_failure;
5146 nfmsg = nlmsg_data(nlh);
5147 nfmsg->nfgen_family = family;
5148 nfmsg->version = NFNETLINK_V0;
5149 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
5151 if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
5152 nla_put_string(skb, NFTA_OBJ_NAME, obj->name) ||
5153 nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) ||
5154 nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
5155 nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset) ||
5156 nla_put_be64(skb, NFTA_OBJ_HANDLE, cpu_to_be64(obj->handle),
5158 goto nla_put_failure;
5160 nlmsg_end(skb, nlh);
5164 nlmsg_trim(skb, nlh);
5168 struct nft_obj_filter {
5173 static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
5175 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
5176 const struct nft_table *table;
5177 unsigned int idx = 0, s_idx = cb->args[0];
5178 struct nft_obj_filter *filter = cb->data;
5179 struct net *net = sock_net(skb->sk);
5180 int family = nfmsg->nfgen_family;
5181 struct nft_object *obj;
5184 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
5188 cb->seq = net->nft.base_seq;
5190 list_for_each_entry_rcu(table, &net->nft.tables, list) {
5191 if (family != NFPROTO_UNSPEC && family != table->family)
5194 list_for_each_entry_rcu(obj, &table->objects, list) {
5195 if (!nft_is_active(net, obj))
5200 memset(&cb->args[1], 0,
5201 sizeof(cb->args) - sizeof(cb->args[0]));
5202 if (filter && filter->table &&
5203 strcmp(filter->table, table->name))
5206 filter->type != NFT_OBJECT_UNSPEC &&
5207 obj->ops->type->type != filter->type)
5210 if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid,
5213 NLM_F_MULTI | NLM_F_APPEND,
5214 table->family, table,
5218 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
5230 static int nf_tables_dump_obj_start(struct netlink_callback *cb)
5232 const struct nlattr * const *nla = cb->data;
5233 struct nft_obj_filter *filter = NULL;
5235 if (nla[NFTA_OBJ_TABLE] || nla[NFTA_OBJ_TYPE]) {
5236 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
5240 if (nla[NFTA_OBJ_TABLE]) {
5241 filter->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_ATOMIC);
5242 if (!filter->table) {
5248 if (nla[NFTA_OBJ_TYPE])
5249 filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
5256 static int nf_tables_dump_obj_done(struct netlink_callback *cb)
5258 struct nft_obj_filter *filter = cb->data;
5261 kfree(filter->table);
5268 /* called with rcu_read_lock held */
5269 static int nf_tables_getobj(struct net *net, struct sock *nlsk,
5270 struct sk_buff *skb, const struct nlmsghdr *nlh,
5271 const struct nlattr * const nla[],
5272 struct netlink_ext_ack *extack)
5274 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
5275 u8 genmask = nft_genmask_cur(net);
5276 int family = nfmsg->nfgen_family;
5277 const struct nft_table *table;
5278 struct nft_object *obj;
5279 struct sk_buff *skb2;
5284 if (nlh->nlmsg_flags & NLM_F_DUMP) {
5285 struct netlink_dump_control c = {
5286 .start = nf_tables_dump_obj_start,
5287 .dump = nf_tables_dump_obj,
5288 .done = nf_tables_dump_obj_done,
5289 .module = THIS_MODULE,
5290 .data = (void *)nla,
5293 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
5296 if (!nla[NFTA_OBJ_NAME] ||
5297 !nla[NFTA_OBJ_TYPE])
5300 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask);
5301 if (IS_ERR(table)) {
5302 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
5303 return PTR_ERR(table);
5306 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
5307 obj = nft_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask);
5309 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
5310 return PTR_ERR(obj);
5313 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
5317 if (NFNL_MSG_TYPE(nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
5320 err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
5321 nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
5322 family, table, obj, reset);
5324 goto err_fill_obj_info;
5326 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
5333 static void nft_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj)
5335 if (obj->ops->destroy)
5336 obj->ops->destroy(ctx, obj);
5338 module_put(obj->ops->type->owner);
5343 static int nf_tables_delobj(struct net *net, struct sock *nlsk,
5344 struct sk_buff *skb, const struct nlmsghdr *nlh,
5345 const struct nlattr * const nla[],
5346 struct netlink_ext_ack *extack)
5348 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
5349 u8 genmask = nft_genmask_next(net);
5350 int family = nfmsg->nfgen_family;
5351 const struct nlattr *attr;
5352 struct nft_table *table;
5353 struct nft_object *obj;
5357 if (!nla[NFTA_OBJ_TYPE] ||
5358 (!nla[NFTA_OBJ_NAME] && !nla[NFTA_OBJ_HANDLE]))
5361 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask);
5362 if (IS_ERR(table)) {
5363 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
5364 return PTR_ERR(table);
5367 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
5368 if (nla[NFTA_OBJ_HANDLE]) {
5369 attr = nla[NFTA_OBJ_HANDLE];
5370 obj = nft_obj_lookup_byhandle(table, attr, objtype, genmask);
5372 attr = nla[NFTA_OBJ_NAME];
5373 obj = nft_obj_lookup(table, attr, objtype, genmask);
5377 NL_SET_BAD_ATTR(extack, attr);
5378 return PTR_ERR(obj);
5381 NL_SET_BAD_ATTR(extack, attr);
5385 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
5387 return nft_delobj(&ctx, obj);
5390 void nft_obj_notify(struct net *net, struct nft_table *table,
5391 struct nft_object *obj, u32 portid, u32 seq, int event,
5392 int family, int report, gfp_t gfp)
5394 struct sk_buff *skb;
5398 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
5401 skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
5405 err = nf_tables_fill_obj_info(skb, net, portid, seq, event, 0, family,
5412 nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, report, gfp);
5415 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
5417 EXPORT_SYMBOL_GPL(nft_obj_notify);
5419 static void nf_tables_obj_notify(const struct nft_ctx *ctx,
5420 struct nft_object *obj, int event)
5422 nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid, ctx->seq, event,
5423 ctx->family, ctx->report, GFP_KERNEL);
5429 void nft_register_flowtable_type(struct nf_flowtable_type *type)
5431 nfnl_lock(NFNL_SUBSYS_NFTABLES);
5432 list_add_tail_rcu(&type->list, &nf_tables_flowtables);
5433 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
5435 EXPORT_SYMBOL_GPL(nft_register_flowtable_type);
5437 void nft_unregister_flowtable_type(struct nf_flowtable_type *type)
5439 nfnl_lock(NFNL_SUBSYS_NFTABLES);
5440 list_del_rcu(&type->list);
5441 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
5443 EXPORT_SYMBOL_GPL(nft_unregister_flowtable_type);
5445 static const struct nla_policy nft_flowtable_policy[NFTA_FLOWTABLE_MAX + 1] = {
5446 [NFTA_FLOWTABLE_TABLE] = { .type = NLA_STRING,
5447 .len = NFT_NAME_MAXLEN - 1 },
5448 [NFTA_FLOWTABLE_NAME] = { .type = NLA_STRING,
5449 .len = NFT_NAME_MAXLEN - 1 },
5450 [NFTA_FLOWTABLE_HOOK] = { .type = NLA_NESTED },
5451 [NFTA_FLOWTABLE_HANDLE] = { .type = NLA_U64 },
5454 struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table,
5455 const struct nlattr *nla, u8 genmask)
5457 struct nft_flowtable *flowtable;
5459 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
5460 if (!nla_strcmp(nla, flowtable->name) &&
5461 nft_active_genmask(flowtable, genmask))
5464 return ERR_PTR(-ENOENT);
5466 EXPORT_SYMBOL_GPL(nft_flowtable_lookup);
5468 static struct nft_flowtable *
5469 nft_flowtable_lookup_byhandle(const struct nft_table *table,
5470 const struct nlattr *nla, u8 genmask)
5472 struct nft_flowtable *flowtable;
5474 list_for_each_entry(flowtable, &table->flowtables, list) {
5475 if (be64_to_cpu(nla_get_be64(nla)) == flowtable->handle &&
5476 nft_active_genmask(flowtable, genmask))
5479 return ERR_PTR(-ENOENT);
5482 static int nf_tables_parse_devices(const struct nft_ctx *ctx,
5483 const struct nlattr *attr,
5484 struct net_device *dev_array[], int *len)
5486 const struct nlattr *tmp;
5487 struct net_device *dev;
5488 char ifname[IFNAMSIZ];
5489 int rem, n = 0, err;
5491 nla_for_each_nested(tmp, attr, rem) {
5492 if (nla_type(tmp) != NFTA_DEVICE_NAME) {
5497 nla_strlcpy(ifname, tmp, IFNAMSIZ);
5498 dev = __dev_get_by_name(ctx->net, ifname);
5504 dev_array[n++] = dev;
5505 if (n == NFT_FLOWTABLE_DEVICE_MAX) {
5519 static const struct nla_policy nft_flowtable_hook_policy[NFTA_FLOWTABLE_HOOK_MAX + 1] = {
5520 [NFTA_FLOWTABLE_HOOK_NUM] = { .type = NLA_U32 },
5521 [NFTA_FLOWTABLE_HOOK_PRIORITY] = { .type = NLA_U32 },
5522 [NFTA_FLOWTABLE_HOOK_DEVS] = { .type = NLA_NESTED },
5525 static int nf_tables_flowtable_parse_hook(const struct nft_ctx *ctx,
5526 const struct nlattr *attr,
5527 struct nft_flowtable *flowtable)
5529 struct net_device *dev_array[NFT_FLOWTABLE_DEVICE_MAX];
5530 struct nlattr *tb[NFTA_FLOWTABLE_HOOK_MAX + 1];
5531 struct nf_hook_ops *ops;
5532 int hooknum, priority;
5535 err = nla_parse_nested(tb, NFTA_FLOWTABLE_HOOK_MAX, attr,
5536 nft_flowtable_hook_policy, NULL);
5540 if (!tb[NFTA_FLOWTABLE_HOOK_NUM] ||
5541 !tb[NFTA_FLOWTABLE_HOOK_PRIORITY] ||
5542 !tb[NFTA_FLOWTABLE_HOOK_DEVS])
5545 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
5546 if (hooknum != NF_NETDEV_INGRESS)
5549 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
5551 err = nf_tables_parse_devices(ctx, tb[NFTA_FLOWTABLE_HOOK_DEVS],
5556 ops = kcalloc(n, sizeof(struct nf_hook_ops), GFP_KERNEL);
5560 flowtable->hooknum = hooknum;
5561 flowtable->priority = priority;
5562 flowtable->ops = ops;
5563 flowtable->ops_len = n;
5565 for (i = 0; i < n; i++) {
5566 flowtable->ops[i].pf = NFPROTO_NETDEV;
5567 flowtable->ops[i].hooknum = hooknum;
5568 flowtable->ops[i].priority = priority;
5569 flowtable->ops[i].priv = &flowtable->data;
5570 flowtable->ops[i].hook = flowtable->data.type->hook;
5571 flowtable->ops[i].dev = dev_array[i];
5577 static const struct nf_flowtable_type *__nft_flowtable_type_get(u8 family)
5579 const struct nf_flowtable_type *type;
5581 list_for_each_entry(type, &nf_tables_flowtables, list) {
5582 if (family == type->family)
5588 static const struct nf_flowtable_type *
5589 nft_flowtable_type_get(struct net *net, u8 family)
5591 const struct nf_flowtable_type *type;
5593 type = __nft_flowtable_type_get(family);
5594 if (type != NULL && try_module_get(type->owner))
5597 lockdep_nfnl_nft_mutex_not_held();
5598 #ifdef CONFIG_MODULES
5600 nft_request_module(net, "nf-flowtable-%u", family);
5601 if (__nft_flowtable_type_get(family))
5602 return ERR_PTR(-EAGAIN);
5605 return ERR_PTR(-ENOENT);
5608 static void nft_unregister_flowtable_net_hooks(struct net *net,
5609 struct nft_flowtable *flowtable)
5613 for (i = 0; i < flowtable->ops_len; i++) {
5614 if (!flowtable->ops[i].dev)
5617 nf_unregister_net_hook(net, &flowtable->ops[i]);
5621 static int nf_tables_newflowtable(struct net *net, struct sock *nlsk,
5622 struct sk_buff *skb,
5623 const struct nlmsghdr *nlh,
5624 const struct nlattr * const nla[],
5625 struct netlink_ext_ack *extack)
5627 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
5628 const struct nf_flowtable_type *type;
5629 struct nft_flowtable *flowtable, *ft;
5630 u8 genmask = nft_genmask_next(net);
5631 int family = nfmsg->nfgen_family;
5632 struct nft_table *table;
5636 if (!nla[NFTA_FLOWTABLE_TABLE] ||
5637 !nla[NFTA_FLOWTABLE_NAME] ||
5638 !nla[NFTA_FLOWTABLE_HOOK])
5641 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
5643 if (IS_ERR(table)) {
5644 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
5645 return PTR_ERR(table);
5648 flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
5650 if (IS_ERR(flowtable)) {
5651 err = PTR_ERR(flowtable);
5652 if (err != -ENOENT) {
5653 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
5657 if (nlh->nlmsg_flags & NLM_F_EXCL) {
5658 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
5665 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
5667 flowtable = kzalloc(sizeof(*flowtable), GFP_KERNEL);
5671 flowtable->table = table;
5672 flowtable->handle = nf_tables_alloc_handle(table);
5674 flowtable->name = nla_strdup(nla[NFTA_FLOWTABLE_NAME], GFP_KERNEL);
5675 if (!flowtable->name) {
5680 type = nft_flowtable_type_get(net, family);
5682 err = PTR_ERR(type);
5686 flowtable->data.type = type;
5687 err = type->init(&flowtable->data);
5691 err = nf_tables_flowtable_parse_hook(&ctx, nla[NFTA_FLOWTABLE_HOOK],
5696 for (i = 0; i < flowtable->ops_len; i++) {
5697 if (!flowtable->ops[i].dev)
5700 list_for_each_entry(ft, &table->flowtables, list) {
5701 for (k = 0; k < ft->ops_len; k++) {
5702 if (!ft->ops[k].dev)
5705 if (flowtable->ops[i].dev == ft->ops[k].dev &&
5706 flowtable->ops[i].pf == ft->ops[k].pf) {
5713 err = nf_register_net_hook(net, &flowtable->ops[i]);
5718 err = nft_trans_flowtable_add(&ctx, NFT_MSG_NEWFLOWTABLE, flowtable);
5722 list_add_tail_rcu(&flowtable->list, &table->flowtables);
5727 i = flowtable->ops_len;
5729 for (k = i - 1; k >= 0; k--)
5730 nf_unregister_net_hook(net, &flowtable->ops[k]);
5732 kfree(flowtable->ops);
5734 flowtable->data.type->free(&flowtable->data);
5736 module_put(type->owner);
5738 kfree(flowtable->name);
5744 static int nf_tables_delflowtable(struct net *net, struct sock *nlsk,
5745 struct sk_buff *skb,
5746 const struct nlmsghdr *nlh,
5747 const struct nlattr * const nla[],
5748 struct netlink_ext_ack *extack)
5750 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
5751 u8 genmask = nft_genmask_next(net);
5752 int family = nfmsg->nfgen_family;
5753 struct nft_flowtable *flowtable;
5754 const struct nlattr *attr;
5755 struct nft_table *table;
5758 if (!nla[NFTA_FLOWTABLE_TABLE] ||
5759 (!nla[NFTA_FLOWTABLE_NAME] &&
5760 !nla[NFTA_FLOWTABLE_HANDLE]))
5763 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
5765 if (IS_ERR(table)) {
5766 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
5767 return PTR_ERR(table);
5770 if (nla[NFTA_FLOWTABLE_HANDLE]) {
5771 attr = nla[NFTA_FLOWTABLE_HANDLE];
5772 flowtable = nft_flowtable_lookup_byhandle(table, attr, genmask);
5774 attr = nla[NFTA_FLOWTABLE_NAME];
5775 flowtable = nft_flowtable_lookup(table, attr, genmask);
5778 if (IS_ERR(flowtable)) {
5779 NL_SET_BAD_ATTR(extack, attr);
5780 return PTR_ERR(flowtable);
5782 if (flowtable->use > 0) {
5783 NL_SET_BAD_ATTR(extack, attr);
5787 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
5789 return nft_delflowtable(&ctx, flowtable);
5792 static int nf_tables_fill_flowtable_info(struct sk_buff *skb, struct net *net,
5793 u32 portid, u32 seq, int event,
5794 u32 flags, int family,
5795 struct nft_flowtable *flowtable)
5797 struct nlattr *nest, *nest_devs;
5798 struct nfgenmsg *nfmsg;
5799 struct nlmsghdr *nlh;
5802 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
5803 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
5805 goto nla_put_failure;
5807 nfmsg = nlmsg_data(nlh);
5808 nfmsg->nfgen_family = family;
5809 nfmsg->version = NFNETLINK_V0;
5810 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
5812 if (nla_put_string(skb, NFTA_FLOWTABLE_TABLE, flowtable->table->name) ||
5813 nla_put_string(skb, NFTA_FLOWTABLE_NAME, flowtable->name) ||
5814 nla_put_be32(skb, NFTA_FLOWTABLE_USE, htonl(flowtable->use)) ||
5815 nla_put_be64(skb, NFTA_FLOWTABLE_HANDLE, cpu_to_be64(flowtable->handle),
5816 NFTA_FLOWTABLE_PAD))
5817 goto nla_put_failure;
5819 nest = nla_nest_start(skb, NFTA_FLOWTABLE_HOOK);
5821 goto nla_put_failure;
5822 if (nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_NUM, htonl(flowtable->hooknum)) ||
5823 nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_PRIORITY, htonl(flowtable->priority)))
5824 goto nla_put_failure;
5826 nest_devs = nla_nest_start(skb, NFTA_FLOWTABLE_HOOK_DEVS);
5828 goto nla_put_failure;
5830 for (i = 0; i < flowtable->ops_len; i++) {
5831 const struct net_device *dev = READ_ONCE(flowtable->ops[i].dev);
5834 nla_put_string(skb, NFTA_DEVICE_NAME, dev->name))
5835 goto nla_put_failure;
5837 nla_nest_end(skb, nest_devs);
5838 nla_nest_end(skb, nest);
5840 nlmsg_end(skb, nlh);
5844 nlmsg_trim(skb, nlh);
5848 struct nft_flowtable_filter {
5852 static int nf_tables_dump_flowtable(struct sk_buff *skb,
5853 struct netlink_callback *cb)
5855 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
5856 struct nft_flowtable_filter *filter = cb->data;
5857 unsigned int idx = 0, s_idx = cb->args[0];
5858 struct net *net = sock_net(skb->sk);
5859 int family = nfmsg->nfgen_family;
5860 struct nft_flowtable *flowtable;
5861 const struct nft_table *table;
5864 cb->seq = net->nft.base_seq;
5866 list_for_each_entry_rcu(table, &net->nft.tables, list) {
5867 if (family != NFPROTO_UNSPEC && family != table->family)
5870 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
5871 if (!nft_is_active(net, flowtable))
5876 memset(&cb->args[1], 0,
5877 sizeof(cb->args) - sizeof(cb->args[0]));
5878 if (filter && filter->table &&
5879 strcmp(filter->table, table->name))
5882 if (nf_tables_fill_flowtable_info(skb, net, NETLINK_CB(cb->skb).portid,
5884 NFT_MSG_NEWFLOWTABLE,
5885 NLM_F_MULTI | NLM_F_APPEND,
5886 table->family, flowtable) < 0)
5889 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
5901 static int nf_tables_dump_flowtable_start(struct netlink_callback *cb)
5903 const struct nlattr * const *nla = cb->data;
5904 struct nft_flowtable_filter *filter = NULL;
5906 if (nla[NFTA_FLOWTABLE_TABLE]) {
5907 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
5911 filter->table = nla_strdup(nla[NFTA_FLOWTABLE_TABLE],
5913 if (!filter->table) {
5923 static int nf_tables_dump_flowtable_done(struct netlink_callback *cb)
5925 struct nft_flowtable_filter *filter = cb->data;
5930 kfree(filter->table);
5936 /* called with rcu_read_lock held */
5937 static int nf_tables_getflowtable(struct net *net, struct sock *nlsk,
5938 struct sk_buff *skb,
5939 const struct nlmsghdr *nlh,
5940 const struct nlattr * const nla[],
5941 struct netlink_ext_ack *extack)
5943 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
5944 u8 genmask = nft_genmask_cur(net);
5945 int family = nfmsg->nfgen_family;
5946 struct nft_flowtable *flowtable;
5947 const struct nft_table *table;
5948 struct sk_buff *skb2;
5951 if (nlh->nlmsg_flags & NLM_F_DUMP) {
5952 struct netlink_dump_control c = {
5953 .start = nf_tables_dump_flowtable_start,
5954 .dump = nf_tables_dump_flowtable,
5955 .done = nf_tables_dump_flowtable_done,
5956 .module = THIS_MODULE,
5957 .data = (void *)nla,
5960 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
5963 if (!nla[NFTA_FLOWTABLE_NAME])
5966 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
5969 return PTR_ERR(table);
5971 flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
5973 if (IS_ERR(flowtable))
5974 return PTR_ERR(flowtable);
5976 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
5980 err = nf_tables_fill_flowtable_info(skb2, net, NETLINK_CB(skb).portid,
5982 NFT_MSG_NEWFLOWTABLE, 0, family,
5985 goto err_fill_flowtable_info;
5987 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
5989 err_fill_flowtable_info:
5994 static void nf_tables_flowtable_notify(struct nft_ctx *ctx,
5995 struct nft_flowtable *flowtable,
5998 struct sk_buff *skb;
6002 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
6005 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
6009 err = nf_tables_fill_flowtable_info(skb, ctx->net, ctx->portid,
6011 ctx->family, flowtable);
6017 nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
6018 ctx->report, GFP_KERNEL);
6021 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
6024 static void nf_tables_flowtable_destroy(struct nft_flowtable *flowtable)
6026 kfree(flowtable->ops);
6027 kfree(flowtable->name);
6028 flowtable->data.type->free(&flowtable->data);
6029 module_put(flowtable->data.type->owner);
6033 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
6034 u32 portid, u32 seq)
6036 struct nlmsghdr *nlh;
6037 struct nfgenmsg *nfmsg;
6038 char buf[TASK_COMM_LEN];
6039 int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN);
6041 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), 0);
6043 goto nla_put_failure;
6045 nfmsg = nlmsg_data(nlh);
6046 nfmsg->nfgen_family = AF_UNSPEC;
6047 nfmsg->version = NFNETLINK_V0;
6048 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
6050 if (nla_put_be32(skb, NFTA_GEN_ID, htonl(net->nft.base_seq)) ||
6051 nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) ||
6052 nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current)))
6053 goto nla_put_failure;
6055 nlmsg_end(skb, nlh);
6059 nlmsg_trim(skb, nlh);
6063 static void nft_flowtable_event(unsigned long event, struct net_device *dev,
6064 struct nft_flowtable *flowtable)
6068 for (i = 0; i < flowtable->ops_len; i++) {
6069 if (flowtable->ops[i].dev != dev)
6072 nf_unregister_net_hook(dev_net(dev), &flowtable->ops[i]);
6073 flowtable->ops[i].dev = NULL;
6078 static int nf_tables_flowtable_event(struct notifier_block *this,
6079 unsigned long event, void *ptr)
6081 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
6082 struct nft_flowtable *flowtable;
6083 struct nft_table *table;
6086 if (event != NETDEV_UNREGISTER)
6090 mutex_lock(&net->nft.commit_mutex);
6091 list_for_each_entry(table, &net->nft.tables, list) {
6092 list_for_each_entry(flowtable, &table->flowtables, list) {
6093 nft_flowtable_event(event, dev, flowtable);
6096 mutex_unlock(&net->nft.commit_mutex);
6101 static struct notifier_block nf_tables_flowtable_notifier = {
6102 .notifier_call = nf_tables_flowtable_event,
6105 static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
6108 struct nlmsghdr *nlh = nlmsg_hdr(skb);
6109 struct sk_buff *skb2;
6112 if (nlmsg_report(nlh) &&
6113 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
6116 skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
6120 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
6127 nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
6128 nlmsg_report(nlh), GFP_KERNEL);
6131 nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
6135 static int nf_tables_getgen(struct net *net, struct sock *nlsk,
6136 struct sk_buff *skb, const struct nlmsghdr *nlh,
6137 const struct nlattr * const nla[],
6138 struct netlink_ext_ack *extack)
6140 struct sk_buff *skb2;
6143 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
6147 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
6150 goto err_fill_gen_info;
6152 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
6159 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
6160 [NFT_MSG_NEWTABLE] = {
6161 .call_batch = nf_tables_newtable,
6162 .attr_count = NFTA_TABLE_MAX,
6163 .policy = nft_table_policy,
6165 [NFT_MSG_GETTABLE] = {
6166 .call_rcu = nf_tables_gettable,
6167 .attr_count = NFTA_TABLE_MAX,
6168 .policy = nft_table_policy,
6170 [NFT_MSG_DELTABLE] = {
6171 .call_batch = nf_tables_deltable,
6172 .attr_count = NFTA_TABLE_MAX,
6173 .policy = nft_table_policy,
6175 [NFT_MSG_NEWCHAIN] = {
6176 .call_batch = nf_tables_newchain,
6177 .attr_count = NFTA_CHAIN_MAX,
6178 .policy = nft_chain_policy,
6180 [NFT_MSG_GETCHAIN] = {
6181 .call_rcu = nf_tables_getchain,
6182 .attr_count = NFTA_CHAIN_MAX,
6183 .policy = nft_chain_policy,
6185 [NFT_MSG_DELCHAIN] = {
6186 .call_batch = nf_tables_delchain,
6187 .attr_count = NFTA_CHAIN_MAX,
6188 .policy = nft_chain_policy,
6190 [NFT_MSG_NEWRULE] = {
6191 .call_batch = nf_tables_newrule,
6192 .attr_count = NFTA_RULE_MAX,
6193 .policy = nft_rule_policy,
6195 [NFT_MSG_GETRULE] = {
6196 .call_rcu = nf_tables_getrule,
6197 .attr_count = NFTA_RULE_MAX,
6198 .policy = nft_rule_policy,
6200 [NFT_MSG_DELRULE] = {
6201 .call_batch = nf_tables_delrule,
6202 .attr_count = NFTA_RULE_MAX,
6203 .policy = nft_rule_policy,
6205 [NFT_MSG_NEWSET] = {
6206 .call_batch = nf_tables_newset,
6207 .attr_count = NFTA_SET_MAX,
6208 .policy = nft_set_policy,
6210 [NFT_MSG_GETSET] = {
6211 .call_rcu = nf_tables_getset,
6212 .attr_count = NFTA_SET_MAX,
6213 .policy = nft_set_policy,
6215 [NFT_MSG_DELSET] = {
6216 .call_batch = nf_tables_delset,
6217 .attr_count = NFTA_SET_MAX,
6218 .policy = nft_set_policy,
6220 [NFT_MSG_NEWSETELEM] = {
6221 .call_batch = nf_tables_newsetelem,
6222 .attr_count = NFTA_SET_ELEM_LIST_MAX,
6223 .policy = nft_set_elem_list_policy,
6225 [NFT_MSG_GETSETELEM] = {
6226 .call_rcu = nf_tables_getsetelem,
6227 .attr_count = NFTA_SET_ELEM_LIST_MAX,
6228 .policy = nft_set_elem_list_policy,
6230 [NFT_MSG_DELSETELEM] = {
6231 .call_batch = nf_tables_delsetelem,
6232 .attr_count = NFTA_SET_ELEM_LIST_MAX,
6233 .policy = nft_set_elem_list_policy,
6235 [NFT_MSG_GETGEN] = {
6236 .call_rcu = nf_tables_getgen,
6238 [NFT_MSG_NEWOBJ] = {
6239 .call_batch = nf_tables_newobj,
6240 .attr_count = NFTA_OBJ_MAX,
6241 .policy = nft_obj_policy,
6243 [NFT_MSG_GETOBJ] = {
6244 .call_rcu = nf_tables_getobj,
6245 .attr_count = NFTA_OBJ_MAX,
6246 .policy = nft_obj_policy,
6248 [NFT_MSG_DELOBJ] = {
6249 .call_batch = nf_tables_delobj,
6250 .attr_count = NFTA_OBJ_MAX,
6251 .policy = nft_obj_policy,
6253 [NFT_MSG_GETOBJ_RESET] = {
6254 .call_rcu = nf_tables_getobj,
6255 .attr_count = NFTA_OBJ_MAX,
6256 .policy = nft_obj_policy,
6258 [NFT_MSG_NEWFLOWTABLE] = {
6259 .call_batch = nf_tables_newflowtable,
6260 .attr_count = NFTA_FLOWTABLE_MAX,
6261 .policy = nft_flowtable_policy,
6263 [NFT_MSG_GETFLOWTABLE] = {
6264 .call_rcu = nf_tables_getflowtable,
6265 .attr_count = NFTA_FLOWTABLE_MAX,
6266 .policy = nft_flowtable_policy,
6268 [NFT_MSG_DELFLOWTABLE] = {
6269 .call_batch = nf_tables_delflowtable,
6270 .attr_count = NFTA_FLOWTABLE_MAX,
6271 .policy = nft_flowtable_policy,
6275 static int nf_tables_validate(struct net *net)
6277 struct nft_table *table;
6279 switch (net->nft.validate_state) {
6280 case NFT_VALIDATE_SKIP:
6282 case NFT_VALIDATE_NEED:
6283 nft_validate_state_update(net, NFT_VALIDATE_DO);
6285 case NFT_VALIDATE_DO:
6286 list_for_each_entry(table, &net->nft.tables, list) {
6287 if (nft_table_validate(net, table) < 0)
6291 nft_validate_state_update(net, NFT_VALIDATE_SKIP);
6298 static void nft_chain_commit_update(struct nft_trans *trans)
6300 struct nft_base_chain *basechain;
6302 if (nft_trans_chain_name(trans)) {
6303 rhltable_remove(&trans->ctx.table->chains_ht,
6304 &trans->ctx.chain->rhlhead,
6305 nft_chain_ht_params);
6306 swap(trans->ctx.chain->name, nft_trans_chain_name(trans));
6307 rhltable_insert_key(&trans->ctx.table->chains_ht,
6308 trans->ctx.chain->name,
6309 &trans->ctx.chain->rhlhead,
6310 nft_chain_ht_params);
6313 if (!nft_is_base_chain(trans->ctx.chain))
6316 basechain = nft_base_chain(trans->ctx.chain);
6317 nft_chain_stats_replace(trans->ctx.net, basechain,
6318 nft_trans_chain_stats(trans));
6320 switch (nft_trans_chain_policy(trans)) {
6323 basechain->policy = nft_trans_chain_policy(trans);
6328 static void nft_commit_release(struct nft_trans *trans)
6330 switch (trans->msg_type) {
6331 case NFT_MSG_DELTABLE:
6332 nf_tables_table_destroy(&trans->ctx);
6334 case NFT_MSG_NEWCHAIN:
6335 kfree(nft_trans_chain_name(trans));
6337 case NFT_MSG_DELCHAIN:
6338 nf_tables_chain_destroy(&trans->ctx);
6340 case NFT_MSG_DELRULE:
6341 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
6343 case NFT_MSG_DELSET:
6344 nft_set_destroy(nft_trans_set(trans));
6346 case NFT_MSG_DELSETELEM:
6347 nf_tables_set_elem_destroy(&trans->ctx,
6348 nft_trans_elem_set(trans),
6349 nft_trans_elem(trans).priv);
6351 case NFT_MSG_DELOBJ:
6352 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
6354 case NFT_MSG_DELFLOWTABLE:
6355 nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
6361 static void nf_tables_commit_release(struct net *net)
6363 struct nft_trans *trans, *next;
6365 if (list_empty(&net->nft.commit_list))
6370 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
6371 list_del(&trans->list);
6372 nft_commit_release(trans);
6376 static int nf_tables_commit_chain_prepare(struct net *net, struct nft_chain *chain)
6378 struct nft_rule *rule;
6379 unsigned int alloc = 0;
6382 /* already handled or inactive chain? */
6383 if (chain->rules_next || !nft_is_active_next(net, chain))
6386 rule = list_entry(&chain->rules, struct nft_rule, list);
6389 list_for_each_entry_continue(rule, &chain->rules, list) {
6390 if (nft_is_active_next(net, rule))
6394 chain->rules_next = nf_tables_chain_alloc_rules(chain, alloc);
6395 if (!chain->rules_next)
6398 list_for_each_entry_continue(rule, &chain->rules, list) {
6399 if (nft_is_active_next(net, rule))
6400 chain->rules_next[i++] = rule;
6403 chain->rules_next[i] = NULL;
6407 static void nf_tables_commit_chain_prepare_cancel(struct net *net)
6409 struct nft_trans *trans, *next;
6411 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
6412 struct nft_chain *chain = trans->ctx.chain;
6414 if (trans->msg_type == NFT_MSG_NEWRULE ||
6415 trans->msg_type == NFT_MSG_DELRULE) {
6416 kvfree(chain->rules_next);
6417 chain->rules_next = NULL;
6422 static void __nf_tables_commit_chain_free_rules_old(struct rcu_head *h)
6424 struct nft_rules_old *o = container_of(h, struct nft_rules_old, h);
6429 static void nf_tables_commit_chain_free_rules_old(struct nft_rule **rules)
6431 struct nft_rule **r = rules;
6432 struct nft_rules_old *old;
6437 r++; /* rcu_head is after end marker */
6441 call_rcu(&old->h, __nf_tables_commit_chain_free_rules_old);
6444 static void nf_tables_commit_chain(struct net *net, struct nft_chain *chain)
6446 struct nft_rule **g0, **g1;
6449 next_genbit = nft_gencursor_next(net);
6451 g0 = rcu_dereference_protected(chain->rules_gen_0,
6452 lockdep_commit_lock_is_held(net));
6453 g1 = rcu_dereference_protected(chain->rules_gen_1,
6454 lockdep_commit_lock_is_held(net));
6456 /* No changes to this chain? */
6457 if (chain->rules_next == NULL) {
6458 /* chain had no change in last or next generation */
6462 * chain had no change in this generation; make sure next
6463 * one uses same rules as current generation.
6466 rcu_assign_pointer(chain->rules_gen_1, g0);
6467 nf_tables_commit_chain_free_rules_old(g1);
6469 rcu_assign_pointer(chain->rules_gen_0, g1);
6470 nf_tables_commit_chain_free_rules_old(g0);
6477 rcu_assign_pointer(chain->rules_gen_1, chain->rules_next);
6479 rcu_assign_pointer(chain->rules_gen_0, chain->rules_next);
6481 chain->rules_next = NULL;
6487 nf_tables_commit_chain_free_rules_old(g1);
6489 nf_tables_commit_chain_free_rules_old(g0);
6492 static void nft_chain_del(struct nft_chain *chain)
6494 struct nft_table *table = chain->table;
6496 WARN_ON_ONCE(rhltable_remove(&table->chains_ht, &chain->rhlhead,
6497 nft_chain_ht_params));
6498 list_del_rcu(&chain->list);
6501 static int nf_tables_commit(struct net *net, struct sk_buff *skb)
6503 struct nft_trans *trans, *next;
6504 struct nft_trans_elem *te;
6505 struct nft_chain *chain;
6506 struct nft_table *table;
6508 /* 0. Validate ruleset, otherwise roll back for error reporting. */
6509 if (nf_tables_validate(net) < 0)
6512 /* 1. Allocate space for next generation rules_gen_X[] */
6513 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
6516 if (trans->msg_type == NFT_MSG_NEWRULE ||
6517 trans->msg_type == NFT_MSG_DELRULE) {
6518 chain = trans->ctx.chain;
6520 ret = nf_tables_commit_chain_prepare(net, chain);
6522 nf_tables_commit_chain_prepare_cancel(net);
6528 /* step 2. Make rules_gen_X visible to packet path */
6529 list_for_each_entry(table, &net->nft.tables, list) {
6530 list_for_each_entry(chain, &table->chains, list)
6531 nf_tables_commit_chain(net, chain);
6535 * Bump generation counter, invalidate any dump in progress.
6536 * Cannot fail after this point.
6538 while (++net->nft.base_seq == 0);
6540 /* step 3. Start new generation, rules_gen_X now in use. */
6541 net->nft.gencursor = nft_gencursor_next(net);
6543 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
6544 switch (trans->msg_type) {
6545 case NFT_MSG_NEWTABLE:
6546 if (nft_trans_table_update(trans)) {
6547 if (!nft_trans_table_enable(trans)) {
6548 nf_tables_table_disable(net,
6550 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
6553 nft_clear(net, trans->ctx.table);
6555 nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
6556 nft_trans_destroy(trans);
6558 case NFT_MSG_DELTABLE:
6559 list_del_rcu(&trans->ctx.table->list);
6560 nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE);
6562 case NFT_MSG_NEWCHAIN:
6563 if (nft_trans_chain_update(trans)) {
6564 nft_chain_commit_update(trans);
6565 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
6566 /* trans destroyed after rcu grace period */
6568 nft_clear(net, trans->ctx.chain);
6569 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
6570 nft_trans_destroy(trans);
6573 case NFT_MSG_DELCHAIN:
6574 nft_chain_del(trans->ctx.chain);
6575 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN);
6576 nf_tables_unregister_hook(trans->ctx.net,
6580 case NFT_MSG_NEWRULE:
6581 nft_clear(trans->ctx.net, nft_trans_rule(trans));
6582 nf_tables_rule_notify(&trans->ctx,
6583 nft_trans_rule(trans),
6585 nft_trans_destroy(trans);
6587 case NFT_MSG_DELRULE:
6588 list_del_rcu(&nft_trans_rule(trans)->list);
6589 nf_tables_rule_notify(&trans->ctx,
6590 nft_trans_rule(trans),
6592 nft_rule_expr_deactivate(&trans->ctx,
6593 nft_trans_rule(trans),
6596 case NFT_MSG_NEWSET:
6597 nft_clear(net, nft_trans_set(trans));
6598 /* This avoids hitting -EBUSY when deleting the table
6599 * from the transaction.
6601 if (nft_set_is_anonymous(nft_trans_set(trans)) &&
6602 !list_empty(&nft_trans_set(trans)->bindings))
6603 trans->ctx.table->use--;
6605 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
6606 NFT_MSG_NEWSET, GFP_KERNEL);
6607 nft_trans_destroy(trans);
6609 case NFT_MSG_DELSET:
6610 list_del_rcu(&nft_trans_set(trans)->list);
6611 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
6612 NFT_MSG_DELSET, GFP_KERNEL);
6614 case NFT_MSG_NEWSETELEM:
6615 te = (struct nft_trans_elem *)trans->data;
6617 te->set->ops->activate(net, te->set, &te->elem);
6618 nf_tables_setelem_notify(&trans->ctx, te->set,
6620 NFT_MSG_NEWSETELEM, 0);
6621 nft_trans_destroy(trans);
6623 case NFT_MSG_DELSETELEM:
6624 te = (struct nft_trans_elem *)trans->data;
6626 nf_tables_setelem_notify(&trans->ctx, te->set,
6628 NFT_MSG_DELSETELEM, 0);
6629 te->set->ops->remove(net, te->set, &te->elem);
6630 atomic_dec(&te->set->nelems);
6633 case NFT_MSG_NEWOBJ:
6634 nft_clear(net, nft_trans_obj(trans));
6635 nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
6637 nft_trans_destroy(trans);
6639 case NFT_MSG_DELOBJ:
6640 list_del_rcu(&nft_trans_obj(trans)->list);
6641 nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
6644 case NFT_MSG_NEWFLOWTABLE:
6645 nft_clear(net, nft_trans_flowtable(trans));
6646 nf_tables_flowtable_notify(&trans->ctx,
6647 nft_trans_flowtable(trans),
6648 NFT_MSG_NEWFLOWTABLE);
6649 nft_trans_destroy(trans);
6651 case NFT_MSG_DELFLOWTABLE:
6652 list_del_rcu(&nft_trans_flowtable(trans)->list);
6653 nf_tables_flowtable_notify(&trans->ctx,
6654 nft_trans_flowtable(trans),
6655 NFT_MSG_DELFLOWTABLE);
6656 nft_unregister_flowtable_net_hooks(net,
6657 nft_trans_flowtable(trans));
6662 nf_tables_commit_release(net);
6663 nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
6664 mutex_unlock(&net->nft.commit_mutex);
6669 static void nf_tables_abort_release(struct nft_trans *trans)
6671 switch (trans->msg_type) {
6672 case NFT_MSG_NEWTABLE:
6673 nf_tables_table_destroy(&trans->ctx);
6675 case NFT_MSG_NEWCHAIN:
6676 nf_tables_chain_destroy(&trans->ctx);
6678 case NFT_MSG_NEWRULE:
6679 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
6681 case NFT_MSG_NEWSET:
6682 nft_set_destroy(nft_trans_set(trans));
6684 case NFT_MSG_NEWSETELEM:
6685 nft_set_elem_destroy(nft_trans_elem_set(trans),
6686 nft_trans_elem(trans).priv, true);
6688 case NFT_MSG_NEWOBJ:
6689 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
6691 case NFT_MSG_NEWFLOWTABLE:
6692 nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
6698 static int __nf_tables_abort(struct net *net)
6700 struct nft_trans *trans, *next;
6701 struct nft_trans_elem *te;
6703 list_for_each_entry_safe_reverse(trans, next, &net->nft.commit_list,
6705 switch (trans->msg_type) {
6706 case NFT_MSG_NEWTABLE:
6707 if (nft_trans_table_update(trans)) {
6708 if (nft_trans_table_enable(trans)) {
6709 nf_tables_table_disable(net,
6711 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
6713 nft_trans_destroy(trans);
6715 list_del_rcu(&trans->ctx.table->list);
6718 case NFT_MSG_DELTABLE:
6719 nft_clear(trans->ctx.net, trans->ctx.table);
6720 nft_trans_destroy(trans);
6722 case NFT_MSG_NEWCHAIN:
6723 if (nft_trans_chain_update(trans)) {
6724 free_percpu(nft_trans_chain_stats(trans));
6725 kfree(nft_trans_chain_name(trans));
6726 nft_trans_destroy(trans);
6728 trans->ctx.table->use--;
6729 nft_chain_del(trans->ctx.chain);
6730 nf_tables_unregister_hook(trans->ctx.net,
6735 case NFT_MSG_DELCHAIN:
6736 trans->ctx.table->use++;
6737 nft_clear(trans->ctx.net, trans->ctx.chain);
6738 nft_trans_destroy(trans);
6740 case NFT_MSG_NEWRULE:
6741 trans->ctx.chain->use--;
6742 list_del_rcu(&nft_trans_rule(trans)->list);
6743 nft_rule_expr_deactivate(&trans->ctx,
6744 nft_trans_rule(trans),
6747 case NFT_MSG_DELRULE:
6748 trans->ctx.chain->use++;
6749 nft_clear(trans->ctx.net, nft_trans_rule(trans));
6750 nft_rule_expr_activate(&trans->ctx, nft_trans_rule(trans));
6751 nft_trans_destroy(trans);
6753 case NFT_MSG_NEWSET:
6754 trans->ctx.table->use--;
6755 if (nft_trans_set_bound(trans)) {
6756 nft_trans_destroy(trans);
6759 list_del_rcu(&nft_trans_set(trans)->list);
6761 case NFT_MSG_DELSET:
6762 trans->ctx.table->use++;
6763 nft_clear(trans->ctx.net, nft_trans_set(trans));
6764 nft_trans_destroy(trans);
6766 case NFT_MSG_NEWSETELEM:
6767 if (nft_trans_elem_set_bound(trans)) {
6768 nft_trans_destroy(trans);
6771 te = (struct nft_trans_elem *)trans->data;
6772 te->set->ops->remove(net, te->set, &te->elem);
6773 atomic_dec(&te->set->nelems);
6775 case NFT_MSG_DELSETELEM:
6776 te = (struct nft_trans_elem *)trans->data;
6778 nft_set_elem_activate(net, te->set, &te->elem);
6779 te->set->ops->activate(net, te->set, &te->elem);
6782 nft_trans_destroy(trans);
6784 case NFT_MSG_NEWOBJ:
6785 trans->ctx.table->use--;
6786 list_del_rcu(&nft_trans_obj(trans)->list);
6788 case NFT_MSG_DELOBJ:
6789 trans->ctx.table->use++;
6790 nft_clear(trans->ctx.net, nft_trans_obj(trans));
6791 nft_trans_destroy(trans);
6793 case NFT_MSG_NEWFLOWTABLE:
6794 trans->ctx.table->use--;
6795 list_del_rcu(&nft_trans_flowtable(trans)->list);
6796 nft_unregister_flowtable_net_hooks(net,
6797 nft_trans_flowtable(trans));
6799 case NFT_MSG_DELFLOWTABLE:
6800 trans->ctx.table->use++;
6801 nft_clear(trans->ctx.net, nft_trans_flowtable(trans));
6802 nft_trans_destroy(trans);
6809 list_for_each_entry_safe_reverse(trans, next,
6810 &net->nft.commit_list, list) {
6811 list_del(&trans->list);
6812 nf_tables_abort_release(trans);
6818 static int nf_tables_abort(struct net *net, struct sk_buff *skb)
6820 int ret = __nf_tables_abort(net);
6822 mutex_unlock(&net->nft.commit_mutex);
6827 static bool nf_tables_valid_genid(struct net *net, u32 genid)
6831 mutex_lock(&net->nft.commit_mutex);
6833 genid_ok = genid == 0 || net->nft.base_seq == genid;
6835 mutex_unlock(&net->nft.commit_mutex);
6837 /* else, commit mutex has to be released by commit or abort function */
6841 static const struct nfnetlink_subsystem nf_tables_subsys = {
6842 .name = "nf_tables",
6843 .subsys_id = NFNL_SUBSYS_NFTABLES,
6844 .cb_count = NFT_MSG_MAX,
6846 .commit = nf_tables_commit,
6847 .abort = nf_tables_abort,
6848 .valid_genid = nf_tables_valid_genid,
6849 .owner = THIS_MODULE,
6852 int nft_chain_validate_dependency(const struct nft_chain *chain,
6853 enum nft_chain_types type)
6855 const struct nft_base_chain *basechain;
6857 if (nft_is_base_chain(chain)) {
6858 basechain = nft_base_chain(chain);
6859 if (basechain->type->type != type)
6864 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
6866 int nft_chain_validate_hooks(const struct nft_chain *chain,
6867 unsigned int hook_flags)
6869 struct nft_base_chain *basechain;
6871 if (nft_is_base_chain(chain)) {
6872 basechain = nft_base_chain(chain);
6874 if ((1 << basechain->ops.hooknum) & hook_flags)
6882 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
6885 * Loop detection - walk through the ruleset beginning at the destination chain
6886 * of a new jump until either the source chain is reached (loop) or all
6887 * reachable chains have been traversed.
6889 * The loop check is performed whenever a new jump verdict is added to an
6890 * expression or verdict map or a verdict map is bound to a new chain.
6893 static int nf_tables_check_loops(const struct nft_ctx *ctx,
6894 const struct nft_chain *chain);
6896 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
6897 struct nft_set *set,
6898 const struct nft_set_iter *iter,
6899 struct nft_set_elem *elem)
6901 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6902 const struct nft_data *data;
6904 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
6905 *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
6908 data = nft_set_ext_data(ext);
6909 switch (data->verdict.code) {
6912 return nf_tables_check_loops(ctx, data->verdict.chain);
6918 static int nf_tables_check_loops(const struct nft_ctx *ctx,
6919 const struct nft_chain *chain)
6921 const struct nft_rule *rule;
6922 const struct nft_expr *expr, *last;
6923 struct nft_set *set;
6924 struct nft_set_binding *binding;
6925 struct nft_set_iter iter;
6927 if (ctx->chain == chain)
6930 list_for_each_entry(rule, &chain->rules, list) {
6931 nft_rule_for_each_expr(expr, last, rule) {
6932 struct nft_immediate_expr *priv;
6933 const struct nft_data *data;
6936 if (strcmp(expr->ops->type->name, "immediate"))
6939 priv = nft_expr_priv(expr);
6940 if (priv->dreg != NFT_REG_VERDICT)
6944 switch (data->verdict.code) {
6947 err = nf_tables_check_loops(ctx,
6948 data->verdict.chain);
6957 list_for_each_entry(set, &ctx->table->sets, list) {
6958 if (!nft_is_active_next(ctx->net, set))
6960 if (!(set->flags & NFT_SET_MAP) ||
6961 set->dtype != NFT_DATA_VERDICT)
6964 list_for_each_entry(binding, &set->bindings, list) {
6965 if (!(binding->flags & NFT_SET_MAP) ||
6966 binding->chain != chain)
6969 iter.genmask = nft_genmask_next(ctx->net);
6973 iter.fn = nf_tables_loop_check_setelem;
6975 set->ops->walk(ctx, set, &iter);
6985 * nft_parse_u32_check - fetch u32 attribute and check for maximum value
6987 * @attr: netlink attribute to fetch value from
6988 * @max: maximum value to be stored in dest
6989 * @dest: pointer to the variable
6991 * Parse, check and store a given u32 netlink attribute into variable.
6992 * This function returns -ERANGE if the value goes over maximum value.
6993 * Otherwise a 0 is returned and the attribute value is stored in the
6994 * destination variable.
6996 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
7000 val = ntohl(nla_get_be32(attr));
7007 EXPORT_SYMBOL_GPL(nft_parse_u32_check);
7009 static int nft_parse_register(const struct nlattr *attr, u32 *preg)
7013 reg = ntohl(nla_get_be32(attr));
7015 case NFT_REG_VERDICT...NFT_REG_4:
7016 *preg = reg * NFT_REG_SIZE / NFT_REG32_SIZE;
7018 case NFT_REG32_00...NFT_REG32_15:
7019 *preg = reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
7029 * nft_dump_register - dump a register value to a netlink attribute
7031 * @skb: socket buffer
7032 * @attr: attribute number
7033 * @reg: register number
7035 * Construct a netlink attribute containing the register number. For
7036 * compatibility reasons, register numbers being a multiple of 4 are
7037 * translated to the corresponding 128 bit register numbers.
7039 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
7041 if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
7042 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
7044 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
7046 return nla_put_be32(skb, attr, htonl(reg));
7048 EXPORT_SYMBOL_GPL(nft_dump_register);
7051 * nft_validate_register_load - validate a load from a register
7053 * @reg: the register number
7054 * @len: the length of the data
7056 * Validate that the input register is one of the general purpose
7057 * registers and that the length of the load is within the bounds.
7059 static int nft_validate_register_load(enum nft_registers reg, unsigned int len)
7061 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
7065 if (reg * NFT_REG32_SIZE + len > FIELD_SIZEOF(struct nft_regs, data))
7071 int nft_parse_register_load(const struct nlattr *attr, u8 *sreg, u32 len)
7076 err = nft_parse_register(attr, ®);
7080 err = nft_validate_register_load(reg, len);
7087 EXPORT_SYMBOL_GPL(nft_parse_register_load);
7090 * nft_validate_register_store - validate an expressions' register store
7092 * @ctx: context of the expression performing the load
7093 * @reg: the destination register number
7094 * @data: the data to load
7095 * @type: the data type
7096 * @len: the length of the data
7098 * Validate that a data load uses the appropriate data type for
7099 * the destination register and the length is within the bounds.
7100 * A value of NULL for the data means that its runtime gathered
7103 static int nft_validate_register_store(const struct nft_ctx *ctx,
7104 enum nft_registers reg,
7105 const struct nft_data *data,
7106 enum nft_data_types type,
7112 case NFT_REG_VERDICT:
7113 if (type != NFT_DATA_VERDICT)
7117 (data->verdict.code == NFT_GOTO ||
7118 data->verdict.code == NFT_JUMP)) {
7119 err = nf_tables_check_loops(ctx, data->verdict.chain);
7126 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
7130 if (reg * NFT_REG32_SIZE + len >
7131 FIELD_SIZEOF(struct nft_regs, data))
7134 if (data != NULL && type != NFT_DATA_VALUE)
7140 int nft_parse_register_store(const struct nft_ctx *ctx,
7141 const struct nlattr *attr, u8 *dreg,
7142 const struct nft_data *data,
7143 enum nft_data_types type, unsigned int len)
7148 err = nft_parse_register(attr, ®);
7152 err = nft_validate_register_store(ctx, reg, data, type, len);
7159 EXPORT_SYMBOL_GPL(nft_parse_register_store);
7161 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
7162 [NFTA_VERDICT_CODE] = { .type = NLA_U32 },
7163 [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING,
7164 .len = NFT_CHAIN_MAXNAMELEN - 1 },
7167 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
7168 struct nft_data_desc *desc, const struct nlattr *nla)
7170 u8 genmask = nft_genmask_next(ctx->net);
7171 struct nlattr *tb[NFTA_VERDICT_MAX + 1];
7172 struct nft_chain *chain;
7175 err = nla_parse_nested(tb, NFTA_VERDICT_MAX, nla, nft_verdict_policy,
7180 if (!tb[NFTA_VERDICT_CODE])
7182 data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
7184 switch (data->verdict.code) {
7186 switch (data->verdict.code & NF_VERDICT_MASK) {
7201 if (!tb[NFTA_VERDICT_CHAIN])
7203 chain = nft_chain_lookup(ctx->net, ctx->table,
7204 tb[NFTA_VERDICT_CHAIN], genmask);
7206 return PTR_ERR(chain);
7207 if (nft_is_base_chain(chain))
7211 data->verdict.chain = chain;
7215 desc->len = sizeof(data->verdict);
7216 desc->type = NFT_DATA_VERDICT;
7220 static void nft_verdict_uninit(const struct nft_data *data)
7222 switch (data->verdict.code) {
7225 data->verdict.chain->use--;
7230 int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
7232 struct nlattr *nest;
7234 nest = nla_nest_start(skb, type);
7236 goto nla_put_failure;
7238 if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
7239 goto nla_put_failure;
7244 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
7246 goto nla_put_failure;
7248 nla_nest_end(skb, nest);
7255 static int nft_value_init(const struct nft_ctx *ctx,
7256 struct nft_data *data, unsigned int size,
7257 struct nft_data_desc *desc, const struct nlattr *nla)
7267 nla_memcpy(data->data, nla, len);
7268 desc->type = NFT_DATA_VALUE;
7273 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
7276 return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
7279 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
7280 [NFTA_DATA_VALUE] = { .type = NLA_BINARY },
7281 [NFTA_DATA_VERDICT] = { .type = NLA_NESTED },
7285 * nft_data_init - parse nf_tables data netlink attributes
7287 * @ctx: context of the expression using the data
7288 * @data: destination struct nft_data
7289 * @size: maximum data length
7290 * @desc: data description
7291 * @nla: netlink attribute containing data
7293 * Parse the netlink data attributes and initialize a struct nft_data.
7294 * The type and length of data are returned in the data description.
7296 * The caller can indicate that it only wants to accept data of type
7297 * NFT_DATA_VALUE by passing NULL for the ctx argument.
7299 int nft_data_init(const struct nft_ctx *ctx,
7300 struct nft_data *data, unsigned int size,
7301 struct nft_data_desc *desc, const struct nlattr *nla)
7303 struct nlattr *tb[NFTA_DATA_MAX + 1];
7306 err = nla_parse_nested(tb, NFTA_DATA_MAX, nla, nft_data_policy, NULL);
7310 if (tb[NFTA_DATA_VALUE])
7311 return nft_value_init(ctx, data, size, desc,
7312 tb[NFTA_DATA_VALUE]);
7313 if (tb[NFTA_DATA_VERDICT] && ctx != NULL)
7314 return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
7317 EXPORT_SYMBOL_GPL(nft_data_init);
7320 * nft_data_release - release a nft_data item
7322 * @data: struct nft_data to release
7323 * @type: type of data
7325 * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
7326 * all others need to be released by calling this function.
7328 void nft_data_release(const struct nft_data *data, enum nft_data_types type)
7330 if (type < NFT_DATA_VERDICT)
7333 case NFT_DATA_VERDICT:
7334 return nft_verdict_uninit(data);
7339 EXPORT_SYMBOL_GPL(nft_data_release);
7341 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
7342 enum nft_data_types type, unsigned int len)
7344 struct nlattr *nest;
7347 nest = nla_nest_start(skb, attr);
7352 case NFT_DATA_VALUE:
7353 err = nft_value_dump(skb, data, len);
7355 case NFT_DATA_VERDICT:
7356 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
7363 nla_nest_end(skb, nest);
7366 EXPORT_SYMBOL_GPL(nft_data_dump);
7368 int __nft_release_basechain(struct nft_ctx *ctx)
7370 struct nft_rule *rule, *nr;
7372 if (WARN_ON(!nft_is_base_chain(ctx->chain)))
7375 nf_tables_unregister_hook(ctx->net, ctx->chain->table, ctx->chain);
7376 list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
7377 list_del(&rule->list);
7379 nf_tables_rule_release(ctx, rule);
7381 nft_chain_del(ctx->chain);
7383 nf_tables_chain_destroy(ctx);
7387 EXPORT_SYMBOL_GPL(__nft_release_basechain);
7389 static void __nft_release_tables(struct net *net)
7391 struct nft_flowtable *flowtable, *nf;
7392 struct nft_table *table, *nt;
7393 struct nft_chain *chain, *nc;
7394 struct nft_object *obj, *ne;
7395 struct nft_rule *rule, *nr;
7396 struct nft_set *set, *ns;
7397 struct nft_ctx ctx = {
7399 .family = NFPROTO_NETDEV,
7402 list_for_each_entry_safe(table, nt, &net->nft.tables, list) {
7403 ctx.family = table->family;
7405 list_for_each_entry(chain, &table->chains, list)
7406 nf_tables_unregister_hook(net, table, chain);
7407 /* No packets are walking on these chains anymore. */
7409 list_for_each_entry(chain, &table->chains, list) {
7411 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
7412 list_del(&rule->list);
7414 nf_tables_rule_release(&ctx, rule);
7417 list_for_each_entry_safe(flowtable, nf, &table->flowtables, list) {
7418 list_del(&flowtable->list);
7420 nf_tables_flowtable_destroy(flowtable);
7422 list_for_each_entry_safe(set, ns, &table->sets, list) {
7423 list_del(&set->list);
7425 nft_set_destroy(set);
7427 list_for_each_entry_safe(obj, ne, &table->objects, list) {
7428 list_del(&obj->list);
7430 nft_obj_destroy(&ctx, obj);
7432 list_for_each_entry_safe(chain, nc, &table->chains, list) {
7434 nft_chain_del(chain);
7436 nf_tables_chain_destroy(&ctx);
7438 list_del(&table->list);
7439 nf_tables_table_destroy(&ctx);
7443 static int __net_init nf_tables_init_net(struct net *net)
7445 INIT_LIST_HEAD(&net->nft.tables);
7446 INIT_LIST_HEAD(&net->nft.commit_list);
7447 mutex_init(&net->nft.commit_mutex);
7448 net->nft.base_seq = 1;
7449 net->nft.validate_state = NFT_VALIDATE_SKIP;
7454 static void __net_exit nf_tables_exit_net(struct net *net)
7456 mutex_lock(&net->nft.commit_mutex);
7457 if (!list_empty(&net->nft.commit_list))
7458 __nf_tables_abort(net);
7459 __nft_release_tables(net);
7460 mutex_unlock(&net->nft.commit_mutex);
7461 WARN_ON_ONCE(!list_empty(&net->nft.tables));
7464 static struct pernet_operations nf_tables_net_ops = {
7465 .init = nf_tables_init_net,
7466 .exit = nf_tables_exit_net,
7469 static int __init nf_tables_module_init(void)
7473 err = register_pernet_subsys(&nf_tables_net_ops);
7477 err = nft_chain_filter_init();
7481 err = nf_tables_core_module_init();
7485 err = register_netdevice_notifier(&nf_tables_flowtable_notifier);
7490 err = nfnetlink_subsys_register(&nf_tables_subsys);
7496 unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
7498 nf_tables_core_module_exit();
7500 nft_chain_filter_fini();
7502 unregister_pernet_subsys(&nf_tables_net_ops);
7506 static void __exit nf_tables_module_exit(void)
7508 nfnetlink_subsys_unregister(&nf_tables_subsys);
7509 unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
7510 nft_chain_filter_fini();
7511 unregister_pernet_subsys(&nf_tables_net_ops);
7513 nf_tables_core_module_exit();
7516 module_init(nf_tables_module_init);
7517 module_exit(nf_tables_module_exit);
7519 MODULE_LICENSE("GPL");
7520 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
7521 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);