1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (c) 2007-2009 Patrick McHardy <kaber@trash.net>
5 * Development of this code funded by Astaro AG (http://www.astaro.com/)
8 #include <linux/module.h>
9 #include <linux/init.h>
10 #include <linux/list.h>
11 #include <linux/skbuff.h>
12 #include <linux/netlink.h>
13 #include <linux/vmalloc.h>
14 #include <linux/rhashtable.h>
15 #include <linux/netfilter.h>
16 #include <linux/netfilter/nfnetlink.h>
17 #include <linux/netfilter/nf_tables.h>
18 #include <net/netfilter/nf_flow_table.h>
19 #include <net/netfilter/nf_tables_core.h>
20 #include <net/netfilter/nf_tables.h>
21 #include <net/netfilter/nf_tables_offload.h>
22 #include <net/net_namespace.h>
25 static LIST_HEAD(nf_tables_expressions);
26 static LIST_HEAD(nf_tables_objects);
27 static LIST_HEAD(nf_tables_flowtables);
28 static LIST_HEAD(nf_tables_destroy_list);
29 static DEFINE_SPINLOCK(nf_tables_destroy_list_lock);
30 static u64 table_handle;
33 NFT_VALIDATE_SKIP = 0,
38 static struct rhltable nft_objname_ht;
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 u32 nft_objname_hash(const void *data, u32 len, u32 seed);
45 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed);
46 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *, const void *);
48 static const struct rhashtable_params nft_chain_ht_params = {
49 .head_offset = offsetof(struct nft_chain, rhlhead),
50 .key_offset = offsetof(struct nft_chain, name),
51 .hashfn = nft_chain_hash,
52 .obj_hashfn = nft_chain_hash_obj,
53 .obj_cmpfn = nft_chain_hash_cmp,
54 .automatic_shrinking = true,
57 static const struct rhashtable_params nft_objname_ht_params = {
58 .head_offset = offsetof(struct nft_object, rhlhead),
59 .key_offset = offsetof(struct nft_object, key),
60 .hashfn = nft_objname_hash,
61 .obj_hashfn = nft_objname_hash_obj,
62 .obj_cmpfn = nft_objname_hash_cmp,
63 .automatic_shrinking = true,
66 static void nft_validate_state_update(struct net *net, u8 new_validate_state)
68 switch (net->nft.validate_state) {
69 case NFT_VALIDATE_SKIP:
70 WARN_ON_ONCE(new_validate_state == NFT_VALIDATE_DO);
72 case NFT_VALIDATE_NEED:
75 if (new_validate_state == NFT_VALIDATE_NEED)
79 net->nft.validate_state = new_validate_state;
81 static void nf_tables_trans_destroy_work(struct work_struct *w);
82 static DECLARE_WORK(trans_destroy_work, nf_tables_trans_destroy_work);
84 static void nft_ctx_init(struct nft_ctx *ctx,
86 const struct sk_buff *skb,
87 const struct nlmsghdr *nlh,
89 struct nft_table *table,
90 struct nft_chain *chain,
91 const struct nlattr * const *nla)
99 ctx->portid = NETLINK_CB(skb).portid;
100 ctx->report = nlmsg_report(nlh);
101 ctx->flags = nlh->nlmsg_flags;
102 ctx->seq = nlh->nlmsg_seq;
105 static struct nft_trans *nft_trans_alloc_gfp(const struct nft_ctx *ctx,
106 int msg_type, u32 size, gfp_t gfp)
108 struct nft_trans *trans;
110 trans = kzalloc(sizeof(struct nft_trans) + size, gfp);
114 trans->msg_type = msg_type;
120 static struct nft_trans *nft_trans_alloc(const struct nft_ctx *ctx,
121 int msg_type, u32 size)
123 return nft_trans_alloc_gfp(ctx, msg_type, size, GFP_KERNEL);
126 static void nft_trans_destroy(struct nft_trans *trans)
128 list_del(&trans->list);
132 static void nft_set_trans_bind(const struct nft_ctx *ctx, struct nft_set *set)
134 struct net *net = ctx->net;
135 struct nft_trans *trans;
137 if (!nft_set_is_anonymous(set))
140 list_for_each_entry_reverse(trans, &net->nft.commit_list, list) {
141 switch (trans->msg_type) {
143 if (nft_trans_set(trans) == set)
144 nft_trans_set_bound(trans) = true;
146 case NFT_MSG_NEWSETELEM:
147 if (nft_trans_elem_set(trans) == set)
148 nft_trans_elem_set_bound(trans) = true;
154 static int nf_tables_register_hook(struct net *net,
155 const struct nft_table *table,
156 struct nft_chain *chain)
158 const struct nft_base_chain *basechain;
159 const struct nf_hook_ops *ops;
161 if (table->flags & NFT_TABLE_F_DORMANT ||
162 !nft_is_base_chain(chain))
165 basechain = nft_base_chain(chain);
166 ops = &basechain->ops;
168 if (basechain->type->ops_register)
169 return basechain->type->ops_register(net, ops);
171 return nf_register_net_hook(net, ops);
174 static void nf_tables_unregister_hook(struct net *net,
175 const struct nft_table *table,
176 struct nft_chain *chain)
178 const struct nft_base_chain *basechain;
179 const struct nf_hook_ops *ops;
181 if (table->flags & NFT_TABLE_F_DORMANT ||
182 !nft_is_base_chain(chain))
184 basechain = nft_base_chain(chain);
185 ops = &basechain->ops;
187 if (basechain->type->ops_unregister)
188 return basechain->type->ops_unregister(net, ops);
190 nf_unregister_net_hook(net, ops);
193 static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type)
195 struct nft_trans *trans;
197 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table));
201 if (msg_type == NFT_MSG_NEWTABLE)
202 nft_activate_next(ctx->net, ctx->table);
204 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
208 static int nft_deltable(struct nft_ctx *ctx)
212 err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE);
216 nft_deactivate_next(ctx->net, ctx->table);
220 static struct nft_trans *nft_trans_chain_add(struct nft_ctx *ctx, int msg_type)
222 struct nft_trans *trans;
224 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain));
226 return ERR_PTR(-ENOMEM);
228 if (msg_type == NFT_MSG_NEWCHAIN)
229 nft_activate_next(ctx->net, ctx->chain);
231 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
235 static int nft_delchain(struct nft_ctx *ctx)
237 struct nft_trans *trans;
239 trans = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN);
241 return PTR_ERR(trans);
244 nft_deactivate_next(ctx->net, ctx->chain);
249 static void nft_rule_expr_activate(const struct nft_ctx *ctx,
250 struct nft_rule *rule)
252 struct nft_expr *expr;
254 expr = nft_expr_first(rule);
255 while (expr != nft_expr_last(rule) && expr->ops) {
256 if (expr->ops->activate)
257 expr->ops->activate(ctx, expr);
259 expr = nft_expr_next(expr);
263 static void nft_rule_expr_deactivate(const struct nft_ctx *ctx,
264 struct nft_rule *rule,
265 enum nft_trans_phase phase)
267 struct nft_expr *expr;
269 expr = nft_expr_first(rule);
270 while (expr != nft_expr_last(rule) && expr->ops) {
271 if (expr->ops->deactivate)
272 expr->ops->deactivate(ctx, expr, phase);
274 expr = nft_expr_next(expr);
279 nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule)
281 /* You cannot delete the same rule twice */
282 if (nft_is_active_next(ctx->net, rule)) {
283 nft_deactivate_next(ctx->net, rule);
290 static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type,
291 struct nft_rule *rule)
293 struct nft_trans *trans;
295 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule));
299 if (msg_type == NFT_MSG_NEWRULE && ctx->nla[NFTA_RULE_ID] != NULL) {
300 nft_trans_rule_id(trans) =
301 ntohl(nla_get_be32(ctx->nla[NFTA_RULE_ID]));
303 nft_trans_rule(trans) = rule;
304 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
309 static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule)
311 struct nft_trans *trans;
314 trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule);
318 err = nf_tables_delrule_deactivate(ctx, rule);
320 nft_trans_destroy(trans);
323 nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_PREPARE);
328 static int nft_delrule_by_chain(struct nft_ctx *ctx)
330 struct nft_rule *rule;
333 list_for_each_entry(rule, &ctx->chain->rules, list) {
334 if (!nft_is_active_next(ctx->net, rule))
337 err = nft_delrule(ctx, rule);
344 static int nft_trans_set_add(const struct nft_ctx *ctx, int msg_type,
347 struct nft_trans *trans;
349 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
353 if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] != NULL) {
354 nft_trans_set_id(trans) =
355 ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
356 nft_activate_next(ctx->net, set);
358 nft_trans_set(trans) = set;
359 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
364 static int nft_delset(const struct nft_ctx *ctx, struct nft_set *set)
368 err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set);
372 nft_deactivate_next(ctx->net, set);
378 static int nft_trans_obj_add(struct nft_ctx *ctx, int msg_type,
379 struct nft_object *obj)
381 struct nft_trans *trans;
383 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_obj));
387 if (msg_type == NFT_MSG_NEWOBJ)
388 nft_activate_next(ctx->net, obj);
390 nft_trans_obj(trans) = obj;
391 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
396 static int nft_delobj(struct nft_ctx *ctx, struct nft_object *obj)
400 err = nft_trans_obj_add(ctx, NFT_MSG_DELOBJ, obj);
404 nft_deactivate_next(ctx->net, obj);
410 static int nft_trans_flowtable_add(struct nft_ctx *ctx, int msg_type,
411 struct nft_flowtable *flowtable)
413 struct nft_trans *trans;
415 trans = nft_trans_alloc(ctx, msg_type,
416 sizeof(struct nft_trans_flowtable));
420 if (msg_type == NFT_MSG_NEWFLOWTABLE)
421 nft_activate_next(ctx->net, flowtable);
423 nft_trans_flowtable(trans) = flowtable;
424 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
429 static int nft_delflowtable(struct nft_ctx *ctx,
430 struct nft_flowtable *flowtable)
434 err = nft_trans_flowtable_add(ctx, NFT_MSG_DELFLOWTABLE, flowtable);
438 nft_deactivate_next(ctx->net, flowtable);
448 static struct nft_table *nft_table_lookup(const struct net *net,
449 const struct nlattr *nla,
450 u8 family, u8 genmask)
452 struct nft_table *table;
455 return ERR_PTR(-EINVAL);
457 list_for_each_entry_rcu(table, &net->nft.tables, list) {
458 if (!nla_strcmp(nla, table->name) &&
459 table->family == family &&
460 nft_active_genmask(table, genmask))
464 return ERR_PTR(-ENOENT);
467 static struct nft_table *nft_table_lookup_byhandle(const struct net *net,
468 const struct nlattr *nla,
471 struct nft_table *table;
473 list_for_each_entry(table, &net->nft.tables, list) {
474 if (be64_to_cpu(nla_get_be64(nla)) == table->handle &&
475 nft_active_genmask(table, genmask))
479 return ERR_PTR(-ENOENT);
482 static inline u64 nf_tables_alloc_handle(struct nft_table *table)
484 return ++table->hgenerator;
487 static const struct nft_chain_type *chain_type[NFPROTO_NUMPROTO][NFT_CHAIN_T_MAX];
489 static const struct nft_chain_type *
490 __nf_tables_chain_type_lookup(const struct nlattr *nla, u8 family)
494 for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
495 if (chain_type[family][i] != NULL &&
496 !nla_strcmp(nla, chain_type[family][i]->name))
497 return chain_type[family][i];
503 * Loading a module requires dropping mutex that guards the
505 * We first need to abort any pending transactions as once
506 * mutex is unlocked a different client could start a new
507 * transaction. It must not see any 'future generation'
508 * changes * as these changes will never happen.
510 #ifdef CONFIG_MODULES
511 static int __nf_tables_abort(struct net *net);
513 static void nft_request_module(struct net *net, const char *fmt, ...)
515 char module_name[MODULE_NAME_LEN];
519 __nf_tables_abort(net);
522 ret = vsnprintf(module_name, MODULE_NAME_LEN, fmt, args);
524 if (WARN(ret >= MODULE_NAME_LEN, "truncated: '%s' (len %d)", module_name, ret))
527 mutex_unlock(&net->nft.commit_mutex);
528 request_module("%s", module_name);
529 mutex_lock(&net->nft.commit_mutex);
533 static void lockdep_nfnl_nft_mutex_not_held(void)
535 #ifdef CONFIG_PROVE_LOCKING
536 WARN_ON_ONCE(lockdep_nfnl_is_held(NFNL_SUBSYS_NFTABLES));
540 static const struct nft_chain_type *
541 nf_tables_chain_type_lookup(struct net *net, const struct nlattr *nla,
542 u8 family, bool autoload)
544 const struct nft_chain_type *type;
546 type = __nf_tables_chain_type_lookup(nla, family);
550 lockdep_nfnl_nft_mutex_not_held();
551 #ifdef CONFIG_MODULES
553 nft_request_module(net, "nft-chain-%u-%.*s", family,
554 nla_len(nla), (const char *)nla_data(nla));
555 type = __nf_tables_chain_type_lookup(nla, family);
557 return ERR_PTR(-EAGAIN);
560 return ERR_PTR(-ENOENT);
563 static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
564 [NFTA_TABLE_NAME] = { .type = NLA_STRING,
565 .len = NFT_TABLE_MAXNAMELEN - 1 },
566 [NFTA_TABLE_FLAGS] = { .type = NLA_U32 },
567 [NFTA_TABLE_HANDLE] = { .type = NLA_U64 },
570 static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
571 u32 portid, u32 seq, int event, u32 flags,
572 int family, const struct nft_table *table)
574 struct nlmsghdr *nlh;
575 struct nfgenmsg *nfmsg;
577 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
578 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
580 goto nla_put_failure;
582 nfmsg = nlmsg_data(nlh);
583 nfmsg->nfgen_family = family;
584 nfmsg->version = NFNETLINK_V0;
585 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
587 if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
588 nla_put_be32(skb, NFTA_TABLE_FLAGS, htonl(table->flags)) ||
589 nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)) ||
590 nla_put_be64(skb, NFTA_TABLE_HANDLE, cpu_to_be64(table->handle),
592 goto nla_put_failure;
598 nlmsg_trim(skb, nlh);
602 static void nf_tables_table_notify(const struct nft_ctx *ctx, int event)
608 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
611 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
615 err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
616 event, 0, ctx->family, ctx->table);
622 nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
623 ctx->report, GFP_KERNEL);
626 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
629 static int nf_tables_dump_tables(struct sk_buff *skb,
630 struct netlink_callback *cb)
632 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
633 const struct nft_table *table;
634 unsigned int idx = 0, s_idx = cb->args[0];
635 struct net *net = sock_net(skb->sk);
636 int family = nfmsg->nfgen_family;
639 cb->seq = net->nft.base_seq;
641 list_for_each_entry_rcu(table, &net->nft.tables, list) {
642 if (family != NFPROTO_UNSPEC && family != table->family)
648 memset(&cb->args[1], 0,
649 sizeof(cb->args) - sizeof(cb->args[0]));
650 if (!nft_is_active(net, table))
652 if (nf_tables_fill_table_info(skb, net,
653 NETLINK_CB(cb->skb).portid,
655 NFT_MSG_NEWTABLE, NLM_F_MULTI,
656 table->family, table) < 0)
659 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
669 static int nft_netlink_dump_start_rcu(struct sock *nlsk, struct sk_buff *skb,
670 const struct nlmsghdr *nlh,
671 struct netlink_dump_control *c)
675 if (!try_module_get(THIS_MODULE))
679 err = netlink_dump_start(nlsk, skb, nlh, c);
681 module_put(THIS_MODULE);
686 /* called with rcu_read_lock held */
687 static int nf_tables_gettable(struct net *net, struct sock *nlsk,
688 struct sk_buff *skb, const struct nlmsghdr *nlh,
689 const struct nlattr * const nla[],
690 struct netlink_ext_ack *extack)
692 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
693 u8 genmask = nft_genmask_cur(net);
694 const struct nft_table *table;
695 struct sk_buff *skb2;
696 int family = nfmsg->nfgen_family;
699 if (nlh->nlmsg_flags & NLM_F_DUMP) {
700 struct netlink_dump_control c = {
701 .dump = nf_tables_dump_tables,
702 .module = THIS_MODULE,
705 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
708 table = nft_table_lookup(net, nla[NFTA_TABLE_NAME], family, genmask);
710 NL_SET_BAD_ATTR(extack, nla[NFTA_TABLE_NAME]);
711 return PTR_ERR(table);
714 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
718 err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
719 nlh->nlmsg_seq, NFT_MSG_NEWTABLE, 0,
724 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
731 static void nft_table_disable(struct net *net, struct nft_table *table, u32 cnt)
733 struct nft_chain *chain;
736 list_for_each_entry(chain, &table->chains, list) {
737 if (!nft_is_active_next(net, chain))
739 if (!nft_is_base_chain(chain))
742 if (cnt && i++ == cnt)
745 nf_unregister_net_hook(net, &nft_base_chain(chain)->ops);
749 static int nf_tables_table_enable(struct net *net, struct nft_table *table)
751 struct nft_chain *chain;
754 list_for_each_entry(chain, &table->chains, list) {
755 if (!nft_is_active_next(net, chain))
757 if (!nft_is_base_chain(chain))
760 err = nf_register_net_hook(net, &nft_base_chain(chain)->ops);
769 nft_table_disable(net, table, i);
773 static void nf_tables_table_disable(struct net *net, struct nft_table *table)
775 nft_table_disable(net, table, 0);
778 static int nf_tables_updtable(struct nft_ctx *ctx)
780 struct nft_trans *trans;
784 if (!ctx->nla[NFTA_TABLE_FLAGS])
787 flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
788 if (flags & ~NFT_TABLE_F_DORMANT)
791 if (flags == ctx->table->flags)
794 trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
795 sizeof(struct nft_trans_table));
799 if ((flags & NFT_TABLE_F_DORMANT) &&
800 !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
801 nft_trans_table_enable(trans) = false;
802 } else if (!(flags & NFT_TABLE_F_DORMANT) &&
803 ctx->table->flags & NFT_TABLE_F_DORMANT) {
804 ret = nf_tables_table_enable(ctx->net, ctx->table);
806 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
807 nft_trans_table_enable(trans) = true;
813 nft_trans_table_update(trans) = true;
814 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
817 nft_trans_destroy(trans);
821 static u32 nft_chain_hash(const void *data, u32 len, u32 seed)
823 const char *name = data;
825 return jhash(name, strlen(name), seed);
828 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed)
830 const struct nft_chain *chain = data;
832 return nft_chain_hash(chain->name, 0, seed);
835 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *arg,
838 const struct nft_chain *chain = ptr;
839 const char *name = arg->key;
841 return strcmp(chain->name, name);
844 static u32 nft_objname_hash(const void *data, u32 len, u32 seed)
846 const struct nft_object_hash_key *k = data;
848 seed ^= hash_ptr(k->table, 32);
850 return jhash(k->name, strlen(k->name), seed);
853 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed)
855 const struct nft_object *obj = data;
857 return nft_objname_hash(&obj->key, 0, seed);
860 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *arg,
863 const struct nft_object_hash_key *k = arg->key;
864 const struct nft_object *obj = ptr;
866 if (obj->key.table != k->table)
869 return strcmp(obj->key.name, k->name);
872 static int nf_tables_newtable(struct net *net, struct sock *nlsk,
873 struct sk_buff *skb, const struct nlmsghdr *nlh,
874 const struct nlattr * const nla[],
875 struct netlink_ext_ack *extack)
877 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
878 u8 genmask = nft_genmask_next(net);
879 int family = nfmsg->nfgen_family;
880 const struct nlattr *attr;
881 struct nft_table *table;
886 lockdep_assert_held(&net->nft.commit_mutex);
887 attr = nla[NFTA_TABLE_NAME];
888 table = nft_table_lookup(net, attr, family, genmask);
890 if (PTR_ERR(table) != -ENOENT)
891 return PTR_ERR(table);
893 if (nlh->nlmsg_flags & NLM_F_EXCL) {
894 NL_SET_BAD_ATTR(extack, attr);
897 if (nlh->nlmsg_flags & NLM_F_REPLACE)
900 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
901 return nf_tables_updtable(&ctx);
904 if (nla[NFTA_TABLE_FLAGS]) {
905 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
906 if (flags & ~NFT_TABLE_F_DORMANT)
911 table = kzalloc(sizeof(*table), GFP_KERNEL);
915 table->name = nla_strdup(attr, GFP_KERNEL);
916 if (table->name == NULL)
919 err = rhltable_init(&table->chains_ht, &nft_chain_ht_params);
923 INIT_LIST_HEAD(&table->chains);
924 INIT_LIST_HEAD(&table->sets);
925 INIT_LIST_HEAD(&table->objects);
926 INIT_LIST_HEAD(&table->flowtables);
927 table->family = family;
928 table->flags = flags;
929 table->handle = ++table_handle;
931 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
932 err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
936 list_add_tail_rcu(&table->list, &net->nft.tables);
939 rhltable_destroy(&table->chains_ht);
948 static int nft_flush_table(struct nft_ctx *ctx)
950 struct nft_flowtable *flowtable, *nft;
951 struct nft_chain *chain, *nc;
952 struct nft_object *obj, *ne;
953 struct nft_set *set, *ns;
956 list_for_each_entry(chain, &ctx->table->chains, list) {
957 if (!nft_is_active_next(ctx->net, chain))
962 err = nft_delrule_by_chain(ctx);
967 list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
968 if (!nft_is_active_next(ctx->net, set))
971 if (nft_set_is_anonymous(set) &&
972 !list_empty(&set->bindings))
975 err = nft_delset(ctx, set);
980 list_for_each_entry_safe(flowtable, nft, &ctx->table->flowtables, list) {
981 err = nft_delflowtable(ctx, flowtable);
986 list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) {
987 err = nft_delobj(ctx, obj);
992 list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
993 if (!nft_is_active_next(ctx->net, chain))
998 err = nft_delchain(ctx);
1003 err = nft_deltable(ctx);
1008 static int nft_flush(struct nft_ctx *ctx, int family)
1010 struct nft_table *table, *nt;
1011 const struct nlattr * const *nla = ctx->nla;
1014 list_for_each_entry_safe(table, nt, &ctx->net->nft.tables, list) {
1015 if (family != AF_UNSPEC && table->family != family)
1018 ctx->family = table->family;
1020 if (!nft_is_active_next(ctx->net, table))
1023 if (nla[NFTA_TABLE_NAME] &&
1024 nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
1029 err = nft_flush_table(ctx);
1037 static int nf_tables_deltable(struct net *net, struct sock *nlsk,
1038 struct sk_buff *skb, const struct nlmsghdr *nlh,
1039 const struct nlattr * const nla[],
1040 struct netlink_ext_ack *extack)
1042 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1043 u8 genmask = nft_genmask_next(net);
1044 int family = nfmsg->nfgen_family;
1045 const struct nlattr *attr;
1046 struct nft_table *table;
1049 nft_ctx_init(&ctx, net, skb, nlh, 0, NULL, NULL, nla);
1050 if (family == AF_UNSPEC ||
1051 (!nla[NFTA_TABLE_NAME] && !nla[NFTA_TABLE_HANDLE]))
1052 return nft_flush(&ctx, family);
1054 if (nla[NFTA_TABLE_HANDLE]) {
1055 attr = nla[NFTA_TABLE_HANDLE];
1056 table = nft_table_lookup_byhandle(net, attr, genmask);
1058 attr = nla[NFTA_TABLE_NAME];
1059 table = nft_table_lookup(net, attr, family, genmask);
1062 if (IS_ERR(table)) {
1063 NL_SET_BAD_ATTR(extack, attr);
1064 return PTR_ERR(table);
1067 if (nlh->nlmsg_flags & NLM_F_NONREC &&
1071 ctx.family = family;
1074 return nft_flush_table(&ctx);
1077 static void nf_tables_table_destroy(struct nft_ctx *ctx)
1079 if (WARN_ON(ctx->table->use > 0))
1082 rhltable_destroy(&ctx->table->chains_ht);
1083 kfree(ctx->table->name);
1087 void nft_register_chain_type(const struct nft_chain_type *ctype)
1089 if (WARN_ON(ctype->family >= NFPROTO_NUMPROTO))
1092 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1093 if (WARN_ON(chain_type[ctype->family][ctype->type] != NULL)) {
1094 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1097 chain_type[ctype->family][ctype->type] = ctype;
1098 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1100 EXPORT_SYMBOL_GPL(nft_register_chain_type);
1102 void nft_unregister_chain_type(const struct nft_chain_type *ctype)
1104 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1105 chain_type[ctype->family][ctype->type] = NULL;
1106 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1108 EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
1114 static struct nft_chain *
1115 nft_chain_lookup_byhandle(const struct nft_table *table, u64 handle, u8 genmask)
1117 struct nft_chain *chain;
1119 list_for_each_entry(chain, &table->chains, list) {
1120 if (chain->handle == handle &&
1121 nft_active_genmask(chain, genmask))
1125 return ERR_PTR(-ENOENT);
1128 static bool lockdep_commit_lock_is_held(const struct net *net)
1130 #ifdef CONFIG_PROVE_LOCKING
1131 return lockdep_is_held(&net->nft.commit_mutex);
1137 static struct nft_chain *nft_chain_lookup(struct net *net,
1138 struct nft_table *table,
1139 const struct nlattr *nla, u8 genmask)
1141 char search[NFT_CHAIN_MAXNAMELEN + 1];
1142 struct rhlist_head *tmp, *list;
1143 struct nft_chain *chain;
1146 return ERR_PTR(-EINVAL);
1148 nla_strlcpy(search, nla, sizeof(search));
1150 WARN_ON(!rcu_read_lock_held() &&
1151 !lockdep_commit_lock_is_held(net));
1153 chain = ERR_PTR(-ENOENT);
1155 list = rhltable_lookup(&table->chains_ht, search, nft_chain_ht_params);
1159 rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
1160 if (nft_active_genmask(chain, genmask))
1163 chain = ERR_PTR(-ENOENT);
1169 static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
1170 [NFTA_CHAIN_TABLE] = { .type = NLA_STRING,
1171 .len = NFT_TABLE_MAXNAMELEN - 1 },
1172 [NFTA_CHAIN_HANDLE] = { .type = NLA_U64 },
1173 [NFTA_CHAIN_NAME] = { .type = NLA_STRING,
1174 .len = NFT_CHAIN_MAXNAMELEN - 1 },
1175 [NFTA_CHAIN_HOOK] = { .type = NLA_NESTED },
1176 [NFTA_CHAIN_POLICY] = { .type = NLA_U32 },
1177 [NFTA_CHAIN_TYPE] = { .type = NLA_STRING },
1178 [NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED },
1179 [NFTA_CHAIN_FLAGS] = { .type = NLA_U32 },
1182 static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
1183 [NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 },
1184 [NFTA_HOOK_PRIORITY] = { .type = NLA_U32 },
1185 [NFTA_HOOK_DEV] = { .type = NLA_STRING,
1186 .len = IFNAMSIZ - 1 },
1189 static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
1191 struct nft_stats *cpu_stats, total;
1192 struct nlattr *nest;
1200 memset(&total, 0, sizeof(total));
1201 for_each_possible_cpu(cpu) {
1202 cpu_stats = per_cpu_ptr(stats, cpu);
1204 seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
1205 pkts = cpu_stats->pkts;
1206 bytes = cpu_stats->bytes;
1207 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq));
1209 total.bytes += bytes;
1211 nest = nla_nest_start_noflag(skb, NFTA_CHAIN_COUNTERS);
1213 goto nla_put_failure;
1215 if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts),
1216 NFTA_COUNTER_PAD) ||
1217 nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
1219 goto nla_put_failure;
1221 nla_nest_end(skb, nest);
1228 static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
1229 u32 portid, u32 seq, int event, u32 flags,
1230 int family, const struct nft_table *table,
1231 const struct nft_chain *chain)
1233 struct nlmsghdr *nlh;
1234 struct nfgenmsg *nfmsg;
1236 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
1237 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
1239 goto nla_put_failure;
1241 nfmsg = nlmsg_data(nlh);
1242 nfmsg->nfgen_family = family;
1243 nfmsg->version = NFNETLINK_V0;
1244 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
1246 if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name))
1247 goto nla_put_failure;
1248 if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle),
1250 goto nla_put_failure;
1251 if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name))
1252 goto nla_put_failure;
1254 if (nft_is_base_chain(chain)) {
1255 const struct nft_base_chain *basechain = nft_base_chain(chain);
1256 const struct nf_hook_ops *ops = &basechain->ops;
1257 struct nft_stats __percpu *stats;
1258 struct nlattr *nest;
1260 nest = nla_nest_start_noflag(skb, NFTA_CHAIN_HOOK);
1262 goto nla_put_failure;
1263 if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
1264 goto nla_put_failure;
1265 if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
1266 goto nla_put_failure;
1267 if (basechain->dev_name[0] &&
1268 nla_put_string(skb, NFTA_HOOK_DEV, basechain->dev_name))
1269 goto nla_put_failure;
1270 nla_nest_end(skb, nest);
1272 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
1273 htonl(basechain->policy)))
1274 goto nla_put_failure;
1276 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
1277 goto nla_put_failure;
1279 stats = rcu_dereference_check(basechain->stats,
1280 lockdep_commit_lock_is_held(net));
1281 if (nft_dump_stats(skb, stats))
1282 goto nla_put_failure;
1285 if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
1286 goto nla_put_failure;
1288 nlmsg_end(skb, nlh);
1292 nlmsg_trim(skb, nlh);
1296 static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event)
1298 struct sk_buff *skb;
1302 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1305 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1309 err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
1310 event, 0, ctx->family, ctx->table,
1317 nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1318 ctx->report, GFP_KERNEL);
1321 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
1324 static int nf_tables_dump_chains(struct sk_buff *skb,
1325 struct netlink_callback *cb)
1327 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1328 const struct nft_table *table;
1329 const struct nft_chain *chain;
1330 unsigned int idx = 0, s_idx = cb->args[0];
1331 struct net *net = sock_net(skb->sk);
1332 int family = nfmsg->nfgen_family;
1335 cb->seq = net->nft.base_seq;
1337 list_for_each_entry_rcu(table, &net->nft.tables, list) {
1338 if (family != NFPROTO_UNSPEC && family != table->family)
1341 list_for_each_entry_rcu(chain, &table->chains, list) {
1345 memset(&cb->args[1], 0,
1346 sizeof(cb->args) - sizeof(cb->args[0]));
1347 if (!nft_is_active(net, chain))
1349 if (nf_tables_fill_chain_info(skb, net,
1350 NETLINK_CB(cb->skb).portid,
1354 table->family, table,
1358 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1369 /* called with rcu_read_lock held */
1370 static int nf_tables_getchain(struct net *net, struct sock *nlsk,
1371 struct sk_buff *skb, const struct nlmsghdr *nlh,
1372 const struct nlattr * const nla[],
1373 struct netlink_ext_ack *extack)
1375 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1376 u8 genmask = nft_genmask_cur(net);
1377 const struct nft_chain *chain;
1378 struct nft_table *table;
1379 struct sk_buff *skb2;
1380 int family = nfmsg->nfgen_family;
1383 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1384 struct netlink_dump_control c = {
1385 .dump = nf_tables_dump_chains,
1386 .module = THIS_MODULE,
1389 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
1392 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask);
1393 if (IS_ERR(table)) {
1394 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
1395 return PTR_ERR(table);
1398 chain = nft_chain_lookup(net, table, nla[NFTA_CHAIN_NAME], genmask);
1399 if (IS_ERR(chain)) {
1400 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
1401 return PTR_ERR(chain);
1404 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1408 err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
1409 nlh->nlmsg_seq, NFT_MSG_NEWCHAIN, 0,
1410 family, table, chain);
1414 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
1421 static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
1422 [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 },
1423 [NFTA_COUNTER_BYTES] = { .type = NLA_U64 },
1426 static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
1428 struct nlattr *tb[NFTA_COUNTER_MAX+1];
1429 struct nft_stats __percpu *newstats;
1430 struct nft_stats *stats;
1433 err = nla_parse_nested_deprecated(tb, NFTA_COUNTER_MAX, attr,
1434 nft_counter_policy, NULL);
1436 return ERR_PTR(err);
1438 if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
1439 return ERR_PTR(-EINVAL);
1441 newstats = netdev_alloc_pcpu_stats(struct nft_stats);
1442 if (newstats == NULL)
1443 return ERR_PTR(-ENOMEM);
1445 /* Restore old counters on this cpu, no problem. Per-cpu statistics
1446 * are not exposed to userspace.
1449 stats = this_cpu_ptr(newstats);
1450 stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
1451 stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
1457 static void nft_chain_stats_replace(struct nft_trans *trans)
1459 struct nft_base_chain *chain = nft_base_chain(trans->ctx.chain);
1461 if (!nft_trans_chain_stats(trans))
1464 rcu_swap_protected(chain->stats, nft_trans_chain_stats(trans),
1465 lockdep_commit_lock_is_held(trans->ctx.net));
1467 if (!nft_trans_chain_stats(trans))
1468 static_branch_inc(&nft_counters_enabled);
1471 static void nf_tables_chain_free_chain_rules(struct nft_chain *chain)
1473 struct nft_rule **g0 = rcu_dereference_raw(chain->rules_gen_0);
1474 struct nft_rule **g1 = rcu_dereference_raw(chain->rules_gen_1);
1480 /* should be NULL either via abort or via successful commit */
1481 WARN_ON_ONCE(chain->rules_next);
1482 kvfree(chain->rules_next);
1485 static void nf_tables_chain_destroy(struct nft_ctx *ctx)
1487 struct nft_chain *chain = ctx->chain;
1489 if (WARN_ON(chain->use > 0))
1492 /* no concurrent access possible anymore */
1493 nf_tables_chain_free_chain_rules(chain);
1495 if (nft_is_base_chain(chain)) {
1496 struct nft_base_chain *basechain = nft_base_chain(chain);
1498 module_put(basechain->type->owner);
1499 if (rcu_access_pointer(basechain->stats)) {
1500 static_branch_dec(&nft_counters_enabled);
1501 free_percpu(rcu_dereference_raw(basechain->stats));
1511 struct nft_chain_hook {
1514 const struct nft_chain_type *type;
1515 struct net_device *dev;
1518 static int nft_chain_parse_hook(struct net *net,
1519 const struct nlattr * const nla[],
1520 struct nft_chain_hook *hook, u8 family,
1523 struct nlattr *ha[NFTA_HOOK_MAX + 1];
1524 const struct nft_chain_type *type;
1525 struct net_device *dev;
1528 lockdep_assert_held(&net->nft.commit_mutex);
1529 lockdep_nfnl_nft_mutex_not_held();
1531 err = nla_parse_nested_deprecated(ha, NFTA_HOOK_MAX,
1532 nla[NFTA_CHAIN_HOOK],
1533 nft_hook_policy, NULL);
1537 if (ha[NFTA_HOOK_HOOKNUM] == NULL ||
1538 ha[NFTA_HOOK_PRIORITY] == NULL)
1541 hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
1542 hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
1544 type = chain_type[family][NFT_CHAIN_T_DEFAULT];
1545 if (nla[NFTA_CHAIN_TYPE]) {
1546 type = nf_tables_chain_type_lookup(net, nla[NFTA_CHAIN_TYPE],
1549 return PTR_ERR(type);
1551 if (hook->num > NF_MAX_HOOKS || !(type->hook_mask & (1 << hook->num)))
1554 if (type->type == NFT_CHAIN_T_NAT &&
1555 hook->priority <= NF_IP_PRI_CONNTRACK)
1558 if (!try_module_get(type->owner))
1564 if (family == NFPROTO_NETDEV) {
1565 char ifname[IFNAMSIZ];
1567 if (!ha[NFTA_HOOK_DEV]) {
1568 module_put(type->owner);
1572 nla_strlcpy(ifname, ha[NFTA_HOOK_DEV], IFNAMSIZ);
1573 dev = __dev_get_by_name(net, ifname);
1575 module_put(type->owner);
1579 } else if (ha[NFTA_HOOK_DEV]) {
1580 module_put(type->owner);
1587 static void nft_chain_release_hook(struct nft_chain_hook *hook)
1589 module_put(hook->type->owner);
1592 struct nft_rules_old {
1594 struct nft_rule **start;
1597 static struct nft_rule **nf_tables_chain_alloc_rules(const struct nft_chain *chain,
1600 if (alloc > INT_MAX)
1603 alloc += 1; /* NULL, ends rules */
1604 if (sizeof(struct nft_rule *) > INT_MAX / alloc)
1607 alloc *= sizeof(struct nft_rule *);
1608 alloc += sizeof(struct nft_rules_old);
1610 return kvmalloc(alloc, GFP_KERNEL);
1613 static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask,
1614 u8 policy, u32 flags)
1616 const struct nlattr * const *nla = ctx->nla;
1617 struct nft_table *table = ctx->table;
1618 struct nft_base_chain *basechain;
1619 struct nft_stats __percpu *stats;
1620 struct net *net = ctx->net;
1621 struct nft_trans *trans;
1622 struct nft_chain *chain;
1623 struct nft_rule **rules;
1626 if (table->use == UINT_MAX)
1629 if (nla[NFTA_CHAIN_HOOK]) {
1630 struct nft_chain_hook hook;
1631 struct nf_hook_ops *ops;
1633 err = nft_chain_parse_hook(net, nla, &hook, family, true);
1637 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL);
1638 if (basechain == NULL) {
1639 nft_chain_release_hook(&hook);
1643 if (hook.dev != NULL)
1644 strncpy(basechain->dev_name, hook.dev->name, IFNAMSIZ);
1646 if (nla[NFTA_CHAIN_COUNTERS]) {
1647 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1648 if (IS_ERR(stats)) {
1649 nft_chain_release_hook(&hook);
1651 return PTR_ERR(stats);
1653 rcu_assign_pointer(basechain->stats, stats);
1654 static_branch_inc(&nft_counters_enabled);
1657 basechain->type = hook.type;
1658 chain = &basechain->chain;
1660 ops = &basechain->ops;
1662 ops->hooknum = hook.num;
1663 ops->priority = hook.priority;
1665 ops->hook = hook.type->hooks[ops->hooknum];
1666 ops->dev = hook.dev;
1668 chain->flags |= NFT_BASE_CHAIN | flags;
1669 basechain->policy = NF_ACCEPT;
1670 if (chain->flags & NFT_CHAIN_HW_OFFLOAD &&
1671 nft_chain_offload_priority(basechain) < 0)
1674 flow_block_init(&basechain->flow_block);
1676 chain = kzalloc(sizeof(*chain), GFP_KERNEL);
1682 INIT_LIST_HEAD(&chain->rules);
1683 chain->handle = nf_tables_alloc_handle(table);
1684 chain->table = table;
1685 chain->name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL);
1691 rules = nf_tables_chain_alloc_rules(chain, 0);
1698 rcu_assign_pointer(chain->rules_gen_0, rules);
1699 rcu_assign_pointer(chain->rules_gen_1, rules);
1701 err = nf_tables_register_hook(net, table, chain);
1705 err = rhltable_insert_key(&table->chains_ht, chain->name,
1706 &chain->rhlhead, nft_chain_ht_params);
1710 trans = nft_trans_chain_add(ctx, NFT_MSG_NEWCHAIN);
1711 if (IS_ERR(trans)) {
1712 err = PTR_ERR(trans);
1713 rhltable_remove(&table->chains_ht, &chain->rhlhead,
1714 nft_chain_ht_params);
1718 nft_trans_chain_policy(trans) = -1;
1719 if (nft_is_base_chain(chain))
1720 nft_trans_chain_policy(trans) = policy;
1723 list_add_tail_rcu(&chain->list, &table->chains);
1727 nf_tables_unregister_hook(net, table, chain);
1729 nf_tables_chain_destroy(ctx);
1734 static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
1737 const struct nlattr * const *nla = ctx->nla;
1738 struct nft_table *table = ctx->table;
1739 struct nft_chain *chain = ctx->chain;
1740 struct nft_base_chain *basechain;
1741 struct nft_stats *stats = NULL;
1742 struct nft_chain_hook hook;
1743 struct nf_hook_ops *ops;
1744 struct nft_trans *trans;
1747 if (chain->flags ^ flags)
1750 if (nla[NFTA_CHAIN_HOOK]) {
1751 if (!nft_is_base_chain(chain))
1754 err = nft_chain_parse_hook(ctx->net, nla, &hook, ctx->family,
1759 basechain = nft_base_chain(chain);
1760 if (basechain->type != hook.type) {
1761 nft_chain_release_hook(&hook);
1765 ops = &basechain->ops;
1766 if (ops->hooknum != hook.num ||
1767 ops->priority != hook.priority ||
1768 ops->dev != hook.dev) {
1769 nft_chain_release_hook(&hook);
1772 nft_chain_release_hook(&hook);
1775 if (nla[NFTA_CHAIN_HANDLE] &&
1776 nla[NFTA_CHAIN_NAME]) {
1777 struct nft_chain *chain2;
1779 chain2 = nft_chain_lookup(ctx->net, table,
1780 nla[NFTA_CHAIN_NAME], genmask);
1781 if (!IS_ERR(chain2))
1785 if (nla[NFTA_CHAIN_COUNTERS]) {
1786 if (!nft_is_base_chain(chain))
1789 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1791 return PTR_ERR(stats);
1795 trans = nft_trans_alloc(ctx, NFT_MSG_NEWCHAIN,
1796 sizeof(struct nft_trans_chain));
1800 nft_trans_chain_stats(trans) = stats;
1801 nft_trans_chain_update(trans) = true;
1803 if (nla[NFTA_CHAIN_POLICY])
1804 nft_trans_chain_policy(trans) = policy;
1806 nft_trans_chain_policy(trans) = -1;
1808 if (nla[NFTA_CHAIN_HANDLE] &&
1809 nla[NFTA_CHAIN_NAME]) {
1810 struct nft_trans *tmp;
1814 name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL);
1819 list_for_each_entry(tmp, &ctx->net->nft.commit_list, list) {
1820 if (tmp->msg_type == NFT_MSG_NEWCHAIN &&
1821 tmp->ctx.table == table &&
1822 nft_trans_chain_update(tmp) &&
1823 nft_trans_chain_name(tmp) &&
1824 strcmp(name, nft_trans_chain_name(tmp)) == 0) {
1830 nft_trans_chain_name(trans) = name;
1832 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
1841 static int nf_tables_newchain(struct net *net, struct sock *nlsk,
1842 struct sk_buff *skb, const struct nlmsghdr *nlh,
1843 const struct nlattr * const nla[],
1844 struct netlink_ext_ack *extack)
1846 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1847 u8 genmask = nft_genmask_next(net);
1848 int family = nfmsg->nfgen_family;
1849 const struct nlattr *attr;
1850 struct nft_table *table;
1851 struct nft_chain *chain;
1852 u8 policy = NF_ACCEPT;
1857 lockdep_assert_held(&net->nft.commit_mutex);
1859 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask);
1860 if (IS_ERR(table)) {
1861 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
1862 return PTR_ERR(table);
1866 attr = nla[NFTA_CHAIN_NAME];
1868 if (nla[NFTA_CHAIN_HANDLE]) {
1869 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
1870 chain = nft_chain_lookup_byhandle(table, handle, genmask);
1871 if (IS_ERR(chain)) {
1872 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_HANDLE]);
1873 return PTR_ERR(chain);
1875 attr = nla[NFTA_CHAIN_HANDLE];
1877 chain = nft_chain_lookup(net, table, attr, genmask);
1878 if (IS_ERR(chain)) {
1879 if (PTR_ERR(chain) != -ENOENT) {
1880 NL_SET_BAD_ATTR(extack, attr);
1881 return PTR_ERR(chain);
1887 if (nla[NFTA_CHAIN_POLICY]) {
1888 if (chain != NULL &&
1889 !nft_is_base_chain(chain)) {
1890 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
1894 if (chain == NULL &&
1895 nla[NFTA_CHAIN_HOOK] == NULL) {
1896 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
1900 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
1910 if (nla[NFTA_CHAIN_FLAGS])
1911 flags = ntohl(nla_get_be32(nla[NFTA_CHAIN_FLAGS]));
1913 flags = chain->flags;
1915 nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
1917 if (chain != NULL) {
1918 if (nlh->nlmsg_flags & NLM_F_EXCL) {
1919 NL_SET_BAD_ATTR(extack, attr);
1922 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1925 return nf_tables_updchain(&ctx, genmask, policy, flags);
1928 return nf_tables_addchain(&ctx, family, genmask, policy, flags);
1931 static int nf_tables_delchain(struct net *net, struct sock *nlsk,
1932 struct sk_buff *skb, const struct nlmsghdr *nlh,
1933 const struct nlattr * const nla[],
1934 struct netlink_ext_ack *extack)
1936 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1937 u8 genmask = nft_genmask_next(net);
1938 int family = nfmsg->nfgen_family;
1939 const struct nlattr *attr;
1940 struct nft_table *table;
1941 struct nft_chain *chain;
1942 struct nft_rule *rule;
1948 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask);
1949 if (IS_ERR(table)) {
1950 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
1951 return PTR_ERR(table);
1954 if (nla[NFTA_CHAIN_HANDLE]) {
1955 attr = nla[NFTA_CHAIN_HANDLE];
1956 handle = be64_to_cpu(nla_get_be64(attr));
1957 chain = nft_chain_lookup_byhandle(table, handle, genmask);
1959 attr = nla[NFTA_CHAIN_NAME];
1960 chain = nft_chain_lookup(net, table, attr, genmask);
1962 if (IS_ERR(chain)) {
1963 NL_SET_BAD_ATTR(extack, attr);
1964 return PTR_ERR(chain);
1967 if (nlh->nlmsg_flags & NLM_F_NONREC &&
1971 nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
1974 list_for_each_entry(rule, &chain->rules, list) {
1975 if (!nft_is_active_next(net, rule))
1979 err = nft_delrule(&ctx, rule);
1984 /* There are rules and elements that are still holding references to us,
1985 * we cannot do a recursive removal in this case.
1988 NL_SET_BAD_ATTR(extack, attr);
1992 return nft_delchain(&ctx);
2000 * nft_register_expr - register nf_tables expr type
2003 * Registers the expr type for use with nf_tables. Returns zero on
2004 * success or a negative errno code otherwise.
2006 int nft_register_expr(struct nft_expr_type *type)
2008 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2009 if (type->family == NFPROTO_UNSPEC)
2010 list_add_tail_rcu(&type->list, &nf_tables_expressions);
2012 list_add_rcu(&type->list, &nf_tables_expressions);
2013 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2016 EXPORT_SYMBOL_GPL(nft_register_expr);
2019 * nft_unregister_expr - unregister nf_tables expr type
2022 * Unregisters the expr typefor use with nf_tables.
2024 void nft_unregister_expr(struct nft_expr_type *type)
2026 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2027 list_del_rcu(&type->list);
2028 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2030 EXPORT_SYMBOL_GPL(nft_unregister_expr);
2032 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
2035 const struct nft_expr_type *type, *candidate = NULL;
2037 list_for_each_entry(type, &nf_tables_expressions, list) {
2038 if (!nla_strcmp(nla, type->name)) {
2039 if (!type->family && !candidate)
2041 else if (type->family == family)
2048 #ifdef CONFIG_MODULES
2049 static int nft_expr_type_request_module(struct net *net, u8 family,
2052 nft_request_module(net, "nft-expr-%u-%.*s", family,
2053 nla_len(nla), (char *)nla_data(nla));
2054 if (__nft_expr_type_get(family, nla))
2061 static const struct nft_expr_type *nft_expr_type_get(struct net *net,
2065 const struct nft_expr_type *type;
2068 return ERR_PTR(-EINVAL);
2070 type = __nft_expr_type_get(family, nla);
2071 if (type != NULL && try_module_get(type->owner))
2074 lockdep_nfnl_nft_mutex_not_held();
2075 #ifdef CONFIG_MODULES
2077 if (nft_expr_type_request_module(net, family, nla) == -EAGAIN)
2078 return ERR_PTR(-EAGAIN);
2080 nft_request_module(net, "nft-expr-%.*s",
2081 nla_len(nla), (char *)nla_data(nla));
2082 if (__nft_expr_type_get(family, nla))
2083 return ERR_PTR(-EAGAIN);
2086 return ERR_PTR(-ENOENT);
2089 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
2090 [NFTA_EXPR_NAME] = { .type = NLA_STRING },
2091 [NFTA_EXPR_DATA] = { .type = NLA_NESTED },
2094 static int nf_tables_fill_expr_info(struct sk_buff *skb,
2095 const struct nft_expr *expr)
2097 if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
2098 goto nla_put_failure;
2100 if (expr->ops->dump) {
2101 struct nlattr *data = nla_nest_start_noflag(skb,
2104 goto nla_put_failure;
2105 if (expr->ops->dump(skb, expr) < 0)
2106 goto nla_put_failure;
2107 nla_nest_end(skb, data);
2116 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
2117 const struct nft_expr *expr)
2119 struct nlattr *nest;
2121 nest = nla_nest_start_noflag(skb, attr);
2123 goto nla_put_failure;
2124 if (nf_tables_fill_expr_info(skb, expr) < 0)
2125 goto nla_put_failure;
2126 nla_nest_end(skb, nest);
2133 struct nft_expr_info {
2134 const struct nft_expr_ops *ops;
2135 struct nlattr *tb[NFT_EXPR_MAXATTR + 1];
2138 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
2139 const struct nlattr *nla,
2140 struct nft_expr_info *info)
2142 const struct nft_expr_type *type;
2143 const struct nft_expr_ops *ops;
2144 struct nlattr *tb[NFTA_EXPR_MAX + 1];
2147 err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
2148 nft_expr_policy, NULL);
2152 type = nft_expr_type_get(ctx->net, ctx->family, tb[NFTA_EXPR_NAME]);
2154 return PTR_ERR(type);
2156 if (tb[NFTA_EXPR_DATA]) {
2157 err = nla_parse_nested_deprecated(info->tb, type->maxattr,
2159 type->policy, NULL);
2163 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
2165 if (type->select_ops != NULL) {
2166 ops = type->select_ops(ctx,
2167 (const struct nlattr * const *)info->tb);
2170 #ifdef CONFIG_MODULES
2172 nft_expr_type_request_module(ctx->net,
2174 tb[NFTA_EXPR_NAME]);
2185 module_put(type->owner);
2189 static int nf_tables_newexpr(const struct nft_ctx *ctx,
2190 const struct nft_expr_info *info,
2191 struct nft_expr *expr)
2193 const struct nft_expr_ops *ops = info->ops;
2198 err = ops->init(ctx, expr, (const struct nlattr **)info->tb);
2209 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
2210 struct nft_expr *expr)
2212 const struct nft_expr_type *type = expr->ops->type;
2214 if (expr->ops->destroy)
2215 expr->ops->destroy(ctx, expr);
2216 module_put(type->owner);
2219 struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
2220 const struct nlattr *nla)
2222 struct nft_expr_info info;
2223 struct nft_expr *expr;
2224 struct module *owner;
2227 err = nf_tables_expr_parse(ctx, nla, &info);
2232 expr = kzalloc(info.ops->size, GFP_KERNEL);
2236 err = nf_tables_newexpr(ctx, &info, expr);
2244 owner = info.ops->type->owner;
2245 if (info.ops->type->release_ops)
2246 info.ops->type->release_ops(info.ops);
2250 return ERR_PTR(err);
2253 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
2255 nf_tables_expr_destroy(ctx, expr);
2263 static struct nft_rule *__nft_rule_lookup(const struct nft_chain *chain,
2266 struct nft_rule *rule;
2268 // FIXME: this sucks
2269 list_for_each_entry_rcu(rule, &chain->rules, list) {
2270 if (handle == rule->handle)
2274 return ERR_PTR(-ENOENT);
2277 static struct nft_rule *nft_rule_lookup(const struct nft_chain *chain,
2278 const struct nlattr *nla)
2281 return ERR_PTR(-EINVAL);
2283 return __nft_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
2286 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
2287 [NFTA_RULE_TABLE] = { .type = NLA_STRING,
2288 .len = NFT_TABLE_MAXNAMELEN - 1 },
2289 [NFTA_RULE_CHAIN] = { .type = NLA_STRING,
2290 .len = NFT_CHAIN_MAXNAMELEN - 1 },
2291 [NFTA_RULE_HANDLE] = { .type = NLA_U64 },
2292 [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
2293 [NFTA_RULE_COMPAT] = { .type = NLA_NESTED },
2294 [NFTA_RULE_POSITION] = { .type = NLA_U64 },
2295 [NFTA_RULE_USERDATA] = { .type = NLA_BINARY,
2296 .len = NFT_USERDATA_MAXLEN },
2297 [NFTA_RULE_ID] = { .type = NLA_U32 },
2298 [NFTA_RULE_POSITION_ID] = { .type = NLA_U32 },
2301 static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
2302 u32 portid, u32 seq, int event,
2303 u32 flags, int family,
2304 const struct nft_table *table,
2305 const struct nft_chain *chain,
2306 const struct nft_rule *rule,
2307 const struct nft_rule *prule)
2309 struct nlmsghdr *nlh;
2310 struct nfgenmsg *nfmsg;
2311 const struct nft_expr *expr, *next;
2312 struct nlattr *list;
2313 u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
2315 nlh = nlmsg_put(skb, portid, seq, type, sizeof(struct nfgenmsg), flags);
2317 goto nla_put_failure;
2319 nfmsg = nlmsg_data(nlh);
2320 nfmsg->nfgen_family = family;
2321 nfmsg->version = NFNETLINK_V0;
2322 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
2324 if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
2325 goto nla_put_failure;
2326 if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
2327 goto nla_put_failure;
2328 if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
2330 goto nla_put_failure;
2332 if (event != NFT_MSG_DELRULE && prule) {
2333 if (nla_put_be64(skb, NFTA_RULE_POSITION,
2334 cpu_to_be64(prule->handle),
2336 goto nla_put_failure;
2339 list = nla_nest_start_noflag(skb, NFTA_RULE_EXPRESSIONS);
2341 goto nla_put_failure;
2342 nft_rule_for_each_expr(expr, next, rule) {
2343 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
2344 goto nla_put_failure;
2346 nla_nest_end(skb, list);
2349 struct nft_userdata *udata = nft_userdata(rule);
2350 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
2352 goto nla_put_failure;
2355 nlmsg_end(skb, nlh);
2359 nlmsg_trim(skb, nlh);
2363 static void nf_tables_rule_notify(const struct nft_ctx *ctx,
2364 const struct nft_rule *rule, int event)
2366 struct sk_buff *skb;
2370 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
2373 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
2377 err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
2378 event, 0, ctx->family, ctx->table,
2379 ctx->chain, rule, NULL);
2385 nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
2386 ctx->report, GFP_KERNEL);
2389 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
2392 struct nft_rule_dump_ctx {
2397 static int __nf_tables_dump_rules(struct sk_buff *skb,
2399 struct netlink_callback *cb,
2400 const struct nft_table *table,
2401 const struct nft_chain *chain)
2403 struct net *net = sock_net(skb->sk);
2404 const struct nft_rule *rule, *prule;
2405 unsigned int s_idx = cb->args[0];
2408 list_for_each_entry_rcu(rule, &chain->rules, list) {
2409 if (!nft_is_active(net, rule))
2414 memset(&cb->args[1], 0,
2415 sizeof(cb->args) - sizeof(cb->args[0]));
2417 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
2420 NLM_F_MULTI | NLM_F_APPEND,
2422 table, chain, rule, prule) < 0)
2425 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
2434 static int nf_tables_dump_rules(struct sk_buff *skb,
2435 struct netlink_callback *cb)
2437 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
2438 const struct nft_rule_dump_ctx *ctx = cb->data;
2439 struct nft_table *table;
2440 const struct nft_chain *chain;
2441 unsigned int idx = 0;
2442 struct net *net = sock_net(skb->sk);
2443 int family = nfmsg->nfgen_family;
2446 cb->seq = net->nft.base_seq;
2448 list_for_each_entry_rcu(table, &net->nft.tables, list) {
2449 if (family != NFPROTO_UNSPEC && family != table->family)
2452 if (ctx && ctx->table && strcmp(ctx->table, table->name) != 0)
2455 if (ctx && ctx->table && ctx->chain) {
2456 struct rhlist_head *list, *tmp;
2458 list = rhltable_lookup(&table->chains_ht, ctx->chain,
2459 nft_chain_ht_params);
2463 rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
2464 if (!nft_is_active(net, chain))
2466 __nf_tables_dump_rules(skb, &idx,
2473 list_for_each_entry_rcu(chain, &table->chains, list) {
2474 if (__nf_tables_dump_rules(skb, &idx, cb, table, chain))
2478 if (ctx && ctx->table)
2488 static int nf_tables_dump_rules_start(struct netlink_callback *cb)
2490 const struct nlattr * const *nla = cb->data;
2491 struct nft_rule_dump_ctx *ctx = NULL;
2493 if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) {
2494 ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
2498 if (nla[NFTA_RULE_TABLE]) {
2499 ctx->table = nla_strdup(nla[NFTA_RULE_TABLE],
2506 if (nla[NFTA_RULE_CHAIN]) {
2507 ctx->chain = nla_strdup(nla[NFTA_RULE_CHAIN],
2521 static int nf_tables_dump_rules_done(struct netlink_callback *cb)
2523 struct nft_rule_dump_ctx *ctx = cb->data;
2533 /* called with rcu_read_lock held */
2534 static int nf_tables_getrule(struct net *net, struct sock *nlsk,
2535 struct sk_buff *skb, const struct nlmsghdr *nlh,
2536 const struct nlattr * const nla[],
2537 struct netlink_ext_ack *extack)
2539 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2540 u8 genmask = nft_genmask_cur(net);
2541 const struct nft_chain *chain;
2542 const struct nft_rule *rule;
2543 struct nft_table *table;
2544 struct sk_buff *skb2;
2545 int family = nfmsg->nfgen_family;
2548 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2549 struct netlink_dump_control c = {
2550 .start= nf_tables_dump_rules_start,
2551 .dump = nf_tables_dump_rules,
2552 .done = nf_tables_dump_rules_done,
2553 .module = THIS_MODULE,
2554 .data = (void *)nla,
2557 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
2560 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask);
2561 if (IS_ERR(table)) {
2562 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
2563 return PTR_ERR(table);
2566 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask);
2567 if (IS_ERR(chain)) {
2568 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
2569 return PTR_ERR(chain);
2572 rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
2574 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
2575 return PTR_ERR(rule);
2578 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
2582 err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
2583 nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
2584 family, table, chain, rule, NULL);
2588 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
2595 static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
2596 struct nft_rule *rule)
2598 struct nft_expr *expr, *next;
2601 * Careful: some expressions might not be initialized in case this
2602 * is called on error from nf_tables_newrule().
2604 expr = nft_expr_first(rule);
2605 while (expr != nft_expr_last(rule) && expr->ops) {
2606 next = nft_expr_next(expr);
2607 nf_tables_expr_destroy(ctx, expr);
2613 static void nf_tables_rule_release(const struct nft_ctx *ctx,
2614 struct nft_rule *rule)
2616 nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_RELEASE);
2617 nf_tables_rule_destroy(ctx, rule);
2620 int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain)
2622 struct nft_expr *expr, *last;
2623 const struct nft_data *data;
2624 struct nft_rule *rule;
2627 if (ctx->level == NFT_JUMP_STACK_SIZE)
2630 list_for_each_entry(rule, &chain->rules, list) {
2631 if (!nft_is_active_next(ctx->net, rule))
2634 nft_rule_for_each_expr(expr, last, rule) {
2635 if (!expr->ops->validate)
2638 err = expr->ops->validate(ctx, expr, &data);
2646 EXPORT_SYMBOL_GPL(nft_chain_validate);
2648 static int nft_table_validate(struct net *net, const struct nft_table *table)
2650 struct nft_chain *chain;
2651 struct nft_ctx ctx = {
2653 .family = table->family,
2657 list_for_each_entry(chain, &table->chains, list) {
2658 if (!nft_is_base_chain(chain))
2662 err = nft_chain_validate(&ctx, chain);
2670 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
2671 const struct nlattr *nla);
2673 #define NFT_RULE_MAXEXPRS 128
2675 static int nf_tables_newrule(struct net *net, struct sock *nlsk,
2676 struct sk_buff *skb, const struct nlmsghdr *nlh,
2677 const struct nlattr * const nla[],
2678 struct netlink_ext_ack *extack)
2680 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2681 u8 genmask = nft_genmask_next(net);
2682 struct nft_expr_info *info = NULL;
2683 int family = nfmsg->nfgen_family;
2684 struct nft_flow_rule *flow;
2685 struct nft_table *table;
2686 struct nft_chain *chain;
2687 struct nft_rule *rule, *old_rule = NULL;
2688 struct nft_userdata *udata;
2689 struct nft_trans *trans = NULL;
2690 struct nft_expr *expr;
2693 unsigned int size, i, n, ulen = 0, usize = 0;
2695 u64 handle, pos_handle;
2697 lockdep_assert_held(&net->nft.commit_mutex);
2699 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask);
2700 if (IS_ERR(table)) {
2701 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
2702 return PTR_ERR(table);
2705 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask);
2706 if (IS_ERR(chain)) {
2707 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
2708 return PTR_ERR(chain);
2711 if (nla[NFTA_RULE_HANDLE]) {
2712 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
2713 rule = __nft_rule_lookup(chain, handle);
2715 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
2716 return PTR_ERR(rule);
2719 if (nlh->nlmsg_flags & NLM_F_EXCL) {
2720 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
2723 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2728 if (!(nlh->nlmsg_flags & NLM_F_CREATE) ||
2729 nlh->nlmsg_flags & NLM_F_REPLACE)
2731 handle = nf_tables_alloc_handle(table);
2733 if (chain->use == UINT_MAX)
2736 if (nla[NFTA_RULE_POSITION]) {
2737 pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
2738 old_rule = __nft_rule_lookup(chain, pos_handle);
2739 if (IS_ERR(old_rule)) {
2740 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION]);
2741 return PTR_ERR(old_rule);
2743 } else if (nla[NFTA_RULE_POSITION_ID]) {
2744 old_rule = nft_rule_lookup_byid(net, nla[NFTA_RULE_POSITION_ID]);
2745 if (IS_ERR(old_rule)) {
2746 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION_ID]);
2747 return PTR_ERR(old_rule);
2752 nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
2756 if (nla[NFTA_RULE_EXPRESSIONS]) {
2757 info = kvmalloc_array(NFT_RULE_MAXEXPRS,
2758 sizeof(struct nft_expr_info),
2763 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
2765 if (nla_type(tmp) != NFTA_LIST_ELEM)
2767 if (n == NFT_RULE_MAXEXPRS)
2769 err = nf_tables_expr_parse(&ctx, tmp, &info[n]);
2772 size += info[n].ops->size;
2776 /* Check for overflow of dlen field */
2778 if (size >= 1 << 12)
2781 if (nla[NFTA_RULE_USERDATA]) {
2782 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
2784 usize = sizeof(struct nft_userdata) + ulen;
2788 rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL);
2792 nft_activate_next(net, rule);
2794 rule->handle = handle;
2796 rule->udata = ulen ? 1 : 0;
2799 udata = nft_userdata(rule);
2800 udata->len = ulen - 1;
2801 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
2804 expr = nft_expr_first(rule);
2805 for (i = 0; i < n; i++) {
2806 err = nf_tables_newexpr(&ctx, &info[i], expr);
2810 if (info[i].ops->validate)
2811 nft_validate_state_update(net, NFT_VALIDATE_NEED);
2814 expr = nft_expr_next(expr);
2817 if (nlh->nlmsg_flags & NLM_F_REPLACE) {
2818 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
2819 if (trans == NULL) {
2823 err = nft_delrule(&ctx, old_rule);
2825 nft_trans_destroy(trans);
2829 list_add_tail_rcu(&rule->list, &old_rule->list);
2831 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
2837 if (nlh->nlmsg_flags & NLM_F_APPEND) {
2839 list_add_rcu(&rule->list, &old_rule->list);
2841 list_add_tail_rcu(&rule->list, &chain->rules);
2844 list_add_tail_rcu(&rule->list, &old_rule->list);
2846 list_add_rcu(&rule->list, &chain->rules);
2852 if (net->nft.validate_state == NFT_VALIDATE_DO)
2853 return nft_table_validate(net, table);
2855 if (chain->flags & NFT_CHAIN_HW_OFFLOAD) {
2856 flow = nft_flow_rule_create(rule);
2858 return PTR_ERR(flow);
2860 nft_trans_flow_rule(trans) = flow;
2865 nf_tables_rule_release(&ctx, rule);
2867 for (i = 0; i < n; i++) {
2869 module_put(info[i].ops->type->owner);
2870 if (info[i].ops->type->release_ops)
2871 info[i].ops->type->release_ops(info[i].ops);
2878 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
2879 const struct nlattr *nla)
2881 u32 id = ntohl(nla_get_be32(nla));
2882 struct nft_trans *trans;
2884 list_for_each_entry(trans, &net->nft.commit_list, list) {
2885 struct nft_rule *rule = nft_trans_rule(trans);
2887 if (trans->msg_type == NFT_MSG_NEWRULE &&
2888 id == nft_trans_rule_id(trans))
2891 return ERR_PTR(-ENOENT);
2894 static int nf_tables_delrule(struct net *net, struct sock *nlsk,
2895 struct sk_buff *skb, const struct nlmsghdr *nlh,
2896 const struct nlattr * const nla[],
2897 struct netlink_ext_ack *extack)
2899 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2900 u8 genmask = nft_genmask_next(net);
2901 struct nft_table *table;
2902 struct nft_chain *chain = NULL;
2903 struct nft_rule *rule;
2904 int family = nfmsg->nfgen_family, err = 0;
2907 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask);
2908 if (IS_ERR(table)) {
2909 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
2910 return PTR_ERR(table);
2913 if (nla[NFTA_RULE_CHAIN]) {
2914 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
2916 if (IS_ERR(chain)) {
2917 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
2918 return PTR_ERR(chain);
2922 nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
2925 if (nla[NFTA_RULE_HANDLE]) {
2926 rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
2928 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
2929 return PTR_ERR(rule);
2932 err = nft_delrule(&ctx, rule);
2933 } else if (nla[NFTA_RULE_ID]) {
2934 rule = nft_rule_lookup_byid(net, nla[NFTA_RULE_ID]);
2936 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_ID]);
2937 return PTR_ERR(rule);
2940 err = nft_delrule(&ctx, rule);
2942 err = nft_delrule_by_chain(&ctx);
2945 list_for_each_entry(chain, &table->chains, list) {
2946 if (!nft_is_active_next(net, chain))
2950 err = nft_delrule_by_chain(&ctx);
2963 static LIST_HEAD(nf_tables_set_types);
2965 int nft_register_set(struct nft_set_type *type)
2967 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2968 list_add_tail_rcu(&type->list, &nf_tables_set_types);
2969 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2972 EXPORT_SYMBOL_GPL(nft_register_set);
2974 void nft_unregister_set(struct nft_set_type *type)
2976 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2977 list_del_rcu(&type->list);
2978 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2980 EXPORT_SYMBOL_GPL(nft_unregister_set);
2982 #define NFT_SET_FEATURES (NFT_SET_INTERVAL | NFT_SET_MAP | \
2983 NFT_SET_TIMEOUT | NFT_SET_OBJECT | \
2986 static bool nft_set_ops_candidate(const struct nft_set_type *type, u32 flags)
2988 return (flags & type->features) == (flags & NFT_SET_FEATURES);
2992 * Select a set implementation based on the data characteristics and the
2993 * given policy. The total memory use might not be known if no size is
2994 * given, in that case the amount of memory per element is used.
2996 static const struct nft_set_ops *
2997 nft_select_set_ops(const struct nft_ctx *ctx,
2998 const struct nlattr * const nla[],
2999 const struct nft_set_desc *desc,
3000 enum nft_set_policies policy)
3002 const struct nft_set_ops *ops, *bops;
3003 struct nft_set_estimate est, best;
3004 const struct nft_set_type *type;
3007 lockdep_assert_held(&ctx->net->nft.commit_mutex);
3008 lockdep_nfnl_nft_mutex_not_held();
3009 #ifdef CONFIG_MODULES
3010 if (list_empty(&nf_tables_set_types)) {
3011 nft_request_module(ctx->net, "nft-set");
3012 if (!list_empty(&nf_tables_set_types))
3013 return ERR_PTR(-EAGAIN);
3016 if (nla[NFTA_SET_FLAGS] != NULL)
3017 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
3024 list_for_each_entry(type, &nf_tables_set_types, list) {
3027 if (!nft_set_ops_candidate(type, flags))
3029 if (!ops->estimate(desc, flags, &est))
3033 case NFT_SET_POL_PERFORMANCE:
3034 if (est.lookup < best.lookup)
3036 if (est.lookup == best.lookup &&
3037 est.space < best.space)
3040 case NFT_SET_POL_MEMORY:
3042 if (est.space < best.space)
3044 if (est.space == best.space &&
3045 est.lookup < best.lookup)
3047 } else if (est.size < best.size || !bops) {
3055 if (!try_module_get(type->owner))
3058 module_put(to_set_type(bops)->owner);
3067 return ERR_PTR(-EOPNOTSUPP);
3070 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
3071 [NFTA_SET_TABLE] = { .type = NLA_STRING,
3072 .len = NFT_TABLE_MAXNAMELEN - 1 },
3073 [NFTA_SET_NAME] = { .type = NLA_STRING,
3074 .len = NFT_SET_MAXNAMELEN - 1 },
3075 [NFTA_SET_FLAGS] = { .type = NLA_U32 },
3076 [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 },
3077 [NFTA_SET_KEY_LEN] = { .type = NLA_U32 },
3078 [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 },
3079 [NFTA_SET_DATA_LEN] = { .type = NLA_U32 },
3080 [NFTA_SET_POLICY] = { .type = NLA_U32 },
3081 [NFTA_SET_DESC] = { .type = NLA_NESTED },
3082 [NFTA_SET_ID] = { .type = NLA_U32 },
3083 [NFTA_SET_TIMEOUT] = { .type = NLA_U64 },
3084 [NFTA_SET_GC_INTERVAL] = { .type = NLA_U32 },
3085 [NFTA_SET_USERDATA] = { .type = NLA_BINARY,
3086 .len = NFT_USERDATA_MAXLEN },
3087 [NFTA_SET_OBJ_TYPE] = { .type = NLA_U32 },
3088 [NFTA_SET_HANDLE] = { .type = NLA_U64 },
3091 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
3092 [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 },
3095 static int nft_ctx_init_from_setattr(struct nft_ctx *ctx, struct net *net,
3096 const struct sk_buff *skb,
3097 const struct nlmsghdr *nlh,
3098 const struct nlattr * const nla[],
3099 struct netlink_ext_ack *extack,
3102 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3103 int family = nfmsg->nfgen_family;
3104 struct nft_table *table = NULL;
3106 if (nla[NFTA_SET_TABLE] != NULL) {
3107 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
3109 if (IS_ERR(table)) {
3110 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
3111 return PTR_ERR(table);
3115 nft_ctx_init(ctx, net, skb, nlh, family, table, NULL, nla);
3119 static struct nft_set *nft_set_lookup(const struct nft_table *table,
3120 const struct nlattr *nla, u8 genmask)
3122 struct nft_set *set;
3125 return ERR_PTR(-EINVAL);
3127 list_for_each_entry_rcu(set, &table->sets, list) {
3128 if (!nla_strcmp(nla, set->name) &&
3129 nft_active_genmask(set, genmask))
3132 return ERR_PTR(-ENOENT);
3135 static struct nft_set *nft_set_lookup_byhandle(const struct nft_table *table,
3136 const struct nlattr *nla,
3139 struct nft_set *set;
3141 list_for_each_entry(set, &table->sets, list) {
3142 if (be64_to_cpu(nla_get_be64(nla)) == set->handle &&
3143 nft_active_genmask(set, genmask))
3146 return ERR_PTR(-ENOENT);
3149 static struct nft_set *nft_set_lookup_byid(const struct net *net,
3150 const struct nlattr *nla, u8 genmask)
3152 struct nft_trans *trans;
3153 u32 id = ntohl(nla_get_be32(nla));
3155 list_for_each_entry(trans, &net->nft.commit_list, list) {
3156 if (trans->msg_type == NFT_MSG_NEWSET) {
3157 struct nft_set *set = nft_trans_set(trans);
3159 if (id == nft_trans_set_id(trans) &&
3160 nft_active_genmask(set, genmask))
3164 return ERR_PTR(-ENOENT);
3167 struct nft_set *nft_set_lookup_global(const struct net *net,
3168 const struct nft_table *table,
3169 const struct nlattr *nla_set_name,
3170 const struct nlattr *nla_set_id,
3173 struct nft_set *set;
3175 set = nft_set_lookup(table, nla_set_name, genmask);
3180 set = nft_set_lookup_byid(net, nla_set_id, genmask);
3184 EXPORT_SYMBOL_GPL(nft_set_lookup_global);
3186 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
3189 const struct nft_set *i;
3191 unsigned long *inuse;
3192 unsigned int n = 0, min = 0;
3194 p = strchr(name, '%');
3196 if (p[1] != 'd' || strchr(p + 2, '%'))
3199 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
3203 list_for_each_entry(i, &ctx->table->sets, list) {
3206 if (!nft_is_active_next(ctx->net, set))
3208 if (!sscanf(i->name, name, &tmp))
3210 if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
3213 set_bit(tmp - min, inuse);
3216 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
3217 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
3218 min += BITS_PER_BYTE * PAGE_SIZE;
3219 memset(inuse, 0, PAGE_SIZE);
3222 free_page((unsigned long)inuse);
3225 set->name = kasprintf(GFP_KERNEL, name, min + n);
3229 list_for_each_entry(i, &ctx->table->sets, list) {
3230 if (!nft_is_active_next(ctx->net, i))
3232 if (!strcmp(set->name, i->name)) {
3240 static int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result)
3242 u64 ms = be64_to_cpu(nla_get_be64(nla));
3243 u64 max = (u64)(~((u64)0));
3245 max = div_u64(max, NSEC_PER_MSEC);
3249 ms *= NSEC_PER_MSEC;
3250 *result = nsecs_to_jiffies64(ms);
3254 static __be64 nf_jiffies64_to_msecs(u64 input)
3256 return cpu_to_be64(jiffies64_to_msecs(input));
3259 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
3260 const struct nft_set *set, u16 event, u16 flags)
3262 struct nfgenmsg *nfmsg;
3263 struct nlmsghdr *nlh;
3264 struct nlattr *desc;
3265 u32 portid = ctx->portid;
3268 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
3269 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3272 goto nla_put_failure;
3274 nfmsg = nlmsg_data(nlh);
3275 nfmsg->nfgen_family = ctx->family;
3276 nfmsg->version = NFNETLINK_V0;
3277 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
3279 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
3280 goto nla_put_failure;
3281 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
3282 goto nla_put_failure;
3283 if (nla_put_be64(skb, NFTA_SET_HANDLE, cpu_to_be64(set->handle),
3285 goto nla_put_failure;
3286 if (set->flags != 0)
3287 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
3288 goto nla_put_failure;
3290 if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
3291 goto nla_put_failure;
3292 if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
3293 goto nla_put_failure;
3294 if (set->flags & NFT_SET_MAP) {
3295 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
3296 goto nla_put_failure;
3297 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
3298 goto nla_put_failure;
3300 if (set->flags & NFT_SET_OBJECT &&
3301 nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
3302 goto nla_put_failure;
3305 nla_put_be64(skb, NFTA_SET_TIMEOUT,
3306 nf_jiffies64_to_msecs(set->timeout),
3308 goto nla_put_failure;
3310 nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(set->gc_int)))
3311 goto nla_put_failure;
3313 if (set->policy != NFT_SET_POL_PERFORMANCE) {
3314 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
3315 goto nla_put_failure;
3318 if (nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
3319 goto nla_put_failure;
3321 desc = nla_nest_start_noflag(skb, NFTA_SET_DESC);
3323 goto nla_put_failure;
3325 nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
3326 goto nla_put_failure;
3327 nla_nest_end(skb, desc);
3329 nlmsg_end(skb, nlh);
3333 nlmsg_trim(skb, nlh);
3337 static void nf_tables_set_notify(const struct nft_ctx *ctx,
3338 const struct nft_set *set, int event,
3341 struct sk_buff *skb;
3342 u32 portid = ctx->portid;
3346 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
3349 skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
3353 err = nf_tables_fill_set(skb, ctx, set, event, 0);
3359 nfnetlink_send(skb, ctx->net, portid, NFNLGRP_NFTABLES, ctx->report,
3363 nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
3366 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
3368 const struct nft_set *set;
3369 unsigned int idx, s_idx = cb->args[0];
3370 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
3371 struct net *net = sock_net(skb->sk);
3372 struct nft_ctx *ctx = cb->data, ctx_set;
3378 cb->seq = net->nft.base_seq;
3380 list_for_each_entry_rcu(table, &net->nft.tables, list) {
3381 if (ctx->family != NFPROTO_UNSPEC &&
3382 ctx->family != table->family)
3385 if (ctx->table && ctx->table != table)
3389 if (cur_table != table)
3395 list_for_each_entry_rcu(set, &table->sets, list) {
3398 if (!nft_is_active(net, set))
3402 ctx_set.table = table;
3403 ctx_set.family = table->family;
3405 if (nf_tables_fill_set(skb, &ctx_set, set,
3409 cb->args[2] = (unsigned long) table;
3412 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3425 static int nf_tables_dump_sets_start(struct netlink_callback *cb)
3427 struct nft_ctx *ctx_dump = NULL;
3429 ctx_dump = kmemdup(cb->data, sizeof(*ctx_dump), GFP_ATOMIC);
3430 if (ctx_dump == NULL)
3433 cb->data = ctx_dump;
3437 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
3443 /* called with rcu_read_lock held */
3444 static int nf_tables_getset(struct net *net, struct sock *nlsk,
3445 struct sk_buff *skb, const struct nlmsghdr *nlh,
3446 const struct nlattr * const nla[],
3447 struct netlink_ext_ack *extack)
3449 u8 genmask = nft_genmask_cur(net);
3450 const struct nft_set *set;
3452 struct sk_buff *skb2;
3453 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3456 /* Verify existence before starting dump */
3457 err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, extack,
3462 if (nlh->nlmsg_flags & NLM_F_DUMP) {
3463 struct netlink_dump_control c = {
3464 .start = nf_tables_dump_sets_start,
3465 .dump = nf_tables_dump_sets,
3466 .done = nf_tables_dump_sets_done,
3468 .module = THIS_MODULE,
3471 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
3474 /* Only accept unspec with dump */
3475 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
3476 return -EAFNOSUPPORT;
3477 if (!nla[NFTA_SET_TABLE])
3480 set = nft_set_lookup(ctx.table, nla[NFTA_SET_NAME], genmask);
3482 return PTR_ERR(set);
3484 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
3488 err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
3492 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
3499 static int nf_tables_set_desc_parse(struct nft_set_desc *desc,
3500 const struct nlattr *nla)
3502 struct nlattr *da[NFTA_SET_DESC_MAX + 1];
3505 err = nla_parse_nested_deprecated(da, NFTA_SET_DESC_MAX, nla,
3506 nft_set_desc_policy, NULL);
3510 if (da[NFTA_SET_DESC_SIZE] != NULL)
3511 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
3516 static int nf_tables_newset(struct net *net, struct sock *nlsk,
3517 struct sk_buff *skb, const struct nlmsghdr *nlh,
3518 const struct nlattr * const nla[],
3519 struct netlink_ext_ack *extack)
3521 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3522 u8 genmask = nft_genmask_next(net);
3523 int family = nfmsg->nfgen_family;
3524 const struct nft_set_ops *ops;
3525 struct nft_table *table;
3526 struct nft_set *set;
3531 u32 ktype, dtype, flags, policy, gc_int, objtype;
3532 struct nft_set_desc desc;
3533 unsigned char *udata;
3537 if (nla[NFTA_SET_TABLE] == NULL ||
3538 nla[NFTA_SET_NAME] == NULL ||
3539 nla[NFTA_SET_KEY_LEN] == NULL ||
3540 nla[NFTA_SET_ID] == NULL)
3543 memset(&desc, 0, sizeof(desc));
3545 ktype = NFT_DATA_VALUE;
3546 if (nla[NFTA_SET_KEY_TYPE] != NULL) {
3547 ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
3548 if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
3552 desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
3553 if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
3557 if (nla[NFTA_SET_FLAGS] != NULL) {
3558 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
3559 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
3560 NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
3561 NFT_SET_MAP | NFT_SET_EVAL |
3564 /* Only one of these operations is supported */
3565 if ((flags & (NFT_SET_MAP | NFT_SET_EVAL | NFT_SET_OBJECT)) ==
3566 (NFT_SET_MAP | NFT_SET_EVAL | NFT_SET_OBJECT))
3571 if (nla[NFTA_SET_DATA_TYPE] != NULL) {
3572 if (!(flags & NFT_SET_MAP))
3575 dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
3576 if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
3577 dtype != NFT_DATA_VERDICT)
3580 if (dtype != NFT_DATA_VERDICT) {
3581 if (nla[NFTA_SET_DATA_LEN] == NULL)
3583 desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
3584 if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
3587 desc.dlen = sizeof(struct nft_verdict);
3588 } else if (flags & NFT_SET_MAP)
3591 if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
3592 if (!(flags & NFT_SET_OBJECT))
3595 objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
3596 if (objtype == NFT_OBJECT_UNSPEC ||
3597 objtype > NFT_OBJECT_MAX)
3599 } else if (flags & NFT_SET_OBJECT)
3602 objtype = NFT_OBJECT_UNSPEC;
3605 if (nla[NFTA_SET_TIMEOUT] != NULL) {
3606 if (!(flags & NFT_SET_TIMEOUT))
3609 err = nf_msecs_to_jiffies64(nla[NFTA_SET_TIMEOUT], &timeout);
3614 if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
3615 if (!(flags & NFT_SET_TIMEOUT))
3617 gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
3620 policy = NFT_SET_POL_PERFORMANCE;
3621 if (nla[NFTA_SET_POLICY] != NULL)
3622 policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
3624 if (nla[NFTA_SET_DESC] != NULL) {
3625 err = nf_tables_set_desc_parse(&desc, nla[NFTA_SET_DESC]);
3630 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, genmask);
3631 if (IS_ERR(table)) {
3632 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
3633 return PTR_ERR(table);
3636 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
3638 set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
3640 if (PTR_ERR(set) != -ENOENT) {
3641 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
3642 return PTR_ERR(set);
3645 if (nlh->nlmsg_flags & NLM_F_EXCL) {
3646 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
3649 if (nlh->nlmsg_flags & NLM_F_REPLACE)
3655 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
3658 ops = nft_select_set_ops(&ctx, nla, &desc, policy);
3660 return PTR_ERR(ops);
3663 if (nla[NFTA_SET_USERDATA])
3664 udlen = nla_len(nla[NFTA_SET_USERDATA]);
3667 if (ops->privsize != NULL)
3668 size = ops->privsize(nla, &desc);
3670 set = kvzalloc(sizeof(*set) + size + udlen, GFP_KERNEL);
3676 name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL);
3682 err = nf_tables_set_alloc_name(&ctx, set, name);
3689 udata = set->data + size;
3690 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
3693 INIT_LIST_HEAD(&set->bindings);
3695 write_pnet(&set->net, net);
3698 set->klen = desc.klen;
3700 set->objtype = objtype;
3701 set->dlen = desc.dlen;
3703 set->size = desc.size;
3704 set->policy = policy;
3707 set->timeout = timeout;
3708 set->gc_int = gc_int;
3709 set->handle = nf_tables_alloc_handle(table);
3711 err = ops->init(set, &desc, nla);
3715 err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
3719 list_add_tail_rcu(&set->list, &table->sets);
3730 module_put(to_set_type(ops)->owner);
3734 static void nft_set_destroy(struct nft_set *set)
3736 if (WARN_ON(set->use > 0))
3739 set->ops->destroy(set);
3740 module_put(to_set_type(set->ops)->owner);
3745 static int nf_tables_delset(struct net *net, struct sock *nlsk,
3746 struct sk_buff *skb, const struct nlmsghdr *nlh,
3747 const struct nlattr * const nla[],
3748 struct netlink_ext_ack *extack)
3750 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3751 u8 genmask = nft_genmask_next(net);
3752 const struct nlattr *attr;
3753 struct nft_set *set;
3757 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
3758 return -EAFNOSUPPORT;
3759 if (nla[NFTA_SET_TABLE] == NULL)
3762 err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, extack,
3767 if (nla[NFTA_SET_HANDLE]) {
3768 attr = nla[NFTA_SET_HANDLE];
3769 set = nft_set_lookup_byhandle(ctx.table, attr, genmask);
3771 attr = nla[NFTA_SET_NAME];
3772 set = nft_set_lookup(ctx.table, attr, genmask);
3776 NL_SET_BAD_ATTR(extack, attr);
3777 return PTR_ERR(set);
3780 (nlh->nlmsg_flags & NLM_F_NONREC && atomic_read(&set->nelems) > 0)) {
3781 NL_SET_BAD_ATTR(extack, attr);
3785 return nft_delset(&ctx, set);
3788 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
3789 struct nft_set *set,
3790 const struct nft_set_iter *iter,
3791 struct nft_set_elem *elem)
3793 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
3794 enum nft_registers dreg;
3796 dreg = nft_type_to_reg(set->dtype);
3797 return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
3798 set->dtype == NFT_DATA_VERDICT ?
3799 NFT_DATA_VERDICT : NFT_DATA_VALUE,
3803 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
3804 struct nft_set_binding *binding)
3806 struct nft_set_binding *i;
3807 struct nft_set_iter iter;
3809 if (set->use == UINT_MAX)
3812 if (!list_empty(&set->bindings) && nft_set_is_anonymous(set))
3815 if (binding->flags & NFT_SET_MAP) {
3816 /* If the set is already bound to the same chain all
3817 * jumps are already validated for that chain.
3819 list_for_each_entry(i, &set->bindings, list) {
3820 if (i->flags & NFT_SET_MAP &&
3821 i->chain == binding->chain)
3825 iter.genmask = nft_genmask_next(ctx->net);
3829 iter.fn = nf_tables_bind_check_setelem;
3831 set->ops->walk(ctx, set, &iter);
3836 binding->chain = ctx->chain;
3837 list_add_tail_rcu(&binding->list, &set->bindings);
3838 nft_set_trans_bind(ctx, set);
3843 EXPORT_SYMBOL_GPL(nf_tables_bind_set);
3845 static void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
3846 struct nft_set_binding *binding, bool event)
3848 list_del_rcu(&binding->list);
3850 if (list_empty(&set->bindings) && nft_set_is_anonymous(set)) {
3851 list_del_rcu(&set->list);
3853 nf_tables_set_notify(ctx, set, NFT_MSG_DELSET,
3858 void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set,
3859 struct nft_set_binding *binding,
3860 enum nft_trans_phase phase)
3863 case NFT_TRANS_PREPARE:
3866 case NFT_TRANS_ABORT:
3867 case NFT_TRANS_RELEASE:
3871 nf_tables_unbind_set(ctx, set, binding,
3872 phase == NFT_TRANS_COMMIT);
3875 EXPORT_SYMBOL_GPL(nf_tables_deactivate_set);
3877 void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set)
3879 if (list_empty(&set->bindings) && nft_set_is_anonymous(set))
3880 nft_set_destroy(set);
3882 EXPORT_SYMBOL_GPL(nf_tables_destroy_set);
3884 const struct nft_set_ext_type nft_set_ext_types[] = {
3885 [NFT_SET_EXT_KEY] = {
3886 .align = __alignof__(u32),
3888 [NFT_SET_EXT_DATA] = {
3889 .align = __alignof__(u32),
3891 [NFT_SET_EXT_EXPR] = {
3892 .align = __alignof__(struct nft_expr),
3894 [NFT_SET_EXT_OBJREF] = {
3895 .len = sizeof(struct nft_object *),
3896 .align = __alignof__(struct nft_object *),
3898 [NFT_SET_EXT_FLAGS] = {
3900 .align = __alignof__(u8),
3902 [NFT_SET_EXT_TIMEOUT] = {
3904 .align = __alignof__(u64),
3906 [NFT_SET_EXT_EXPIRATION] = {
3908 .align = __alignof__(u64),
3910 [NFT_SET_EXT_USERDATA] = {
3911 .len = sizeof(struct nft_userdata),
3912 .align = __alignof__(struct nft_userdata),
3915 EXPORT_SYMBOL_GPL(nft_set_ext_types);
3921 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
3922 [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED },
3923 [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED },
3924 [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 },
3925 [NFTA_SET_ELEM_TIMEOUT] = { .type = NLA_U64 },
3926 [NFTA_SET_ELEM_EXPIRATION] = { .type = NLA_U64 },
3927 [NFTA_SET_ELEM_USERDATA] = { .type = NLA_BINARY,
3928 .len = NFT_USERDATA_MAXLEN },
3929 [NFTA_SET_ELEM_EXPR] = { .type = NLA_NESTED },
3930 [NFTA_SET_ELEM_OBJREF] = { .type = NLA_STRING },
3933 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
3934 [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING,
3935 .len = NFT_TABLE_MAXNAMELEN - 1 },
3936 [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING,
3937 .len = NFT_SET_MAXNAMELEN - 1 },
3938 [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED },
3939 [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 },
3942 static int nft_ctx_init_from_elemattr(struct nft_ctx *ctx, struct net *net,
3943 const struct sk_buff *skb,
3944 const struct nlmsghdr *nlh,
3945 const struct nlattr * const nla[],
3946 struct netlink_ext_ack *extack,
3949 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3950 int family = nfmsg->nfgen_family;
3951 struct nft_table *table;
3953 table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
3955 if (IS_ERR(table)) {
3956 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
3957 return PTR_ERR(table);
3960 nft_ctx_init(ctx, net, skb, nlh, family, table, NULL, nla);
3964 static int nf_tables_fill_setelem(struct sk_buff *skb,
3965 const struct nft_set *set,
3966 const struct nft_set_elem *elem)
3968 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
3969 unsigned char *b = skb_tail_pointer(skb);
3970 struct nlattr *nest;
3972 nest = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
3974 goto nla_put_failure;
3976 if (nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
3977 NFT_DATA_VALUE, set->klen) < 0)
3978 goto nla_put_failure;
3980 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
3981 nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
3982 set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
3984 goto nla_put_failure;
3986 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR) &&
3987 nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, nft_set_ext_expr(ext)) < 0)
3988 goto nla_put_failure;
3990 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
3991 nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
3992 (*nft_set_ext_obj(ext))->key.name) < 0)
3993 goto nla_put_failure;
3995 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
3996 nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
3997 htonl(*nft_set_ext_flags(ext))))
3998 goto nla_put_failure;
4000 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
4001 nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
4002 nf_jiffies64_to_msecs(*nft_set_ext_timeout(ext)),
4004 goto nla_put_failure;
4006 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
4007 u64 expires, now = get_jiffies_64();
4009 expires = *nft_set_ext_expiration(ext);
4010 if (time_before64(now, expires))
4015 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
4016 nf_jiffies64_to_msecs(expires),
4018 goto nla_put_failure;
4021 if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
4022 struct nft_userdata *udata;
4024 udata = nft_set_ext_userdata(ext);
4025 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
4026 udata->len + 1, udata->data))
4027 goto nla_put_failure;
4030 nla_nest_end(skb, nest);
4038 struct nft_set_dump_args {
4039 const struct netlink_callback *cb;
4040 struct nft_set_iter iter;
4041 struct sk_buff *skb;
4044 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
4045 struct nft_set *set,
4046 const struct nft_set_iter *iter,
4047 struct nft_set_elem *elem)
4049 struct nft_set_dump_args *args;
4051 args = container_of(iter, struct nft_set_dump_args, iter);
4052 return nf_tables_fill_setelem(args->skb, set, elem);
4055 struct nft_set_dump_ctx {
4056 const struct nft_set *set;
4060 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
4062 struct nft_set_dump_ctx *dump_ctx = cb->data;
4063 struct net *net = sock_net(skb->sk);
4064 struct nft_table *table;
4065 struct nft_set *set;
4066 struct nft_set_dump_args args;
4067 bool set_found = false;
4068 struct nfgenmsg *nfmsg;
4069 struct nlmsghdr *nlh;
4070 struct nlattr *nest;
4075 list_for_each_entry_rcu(table, &net->nft.tables, list) {
4076 if (dump_ctx->ctx.family != NFPROTO_UNSPEC &&
4077 dump_ctx->ctx.family != table->family)
4080 if (table != dump_ctx->ctx.table)
4083 list_for_each_entry_rcu(set, &table->sets, list) {
4084 if (set == dump_ctx->set) {
4097 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM);
4098 portid = NETLINK_CB(cb->skb).portid;
4099 seq = cb->nlh->nlmsg_seq;
4101 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
4104 goto nla_put_failure;
4106 nfmsg = nlmsg_data(nlh);
4107 nfmsg->nfgen_family = table->family;
4108 nfmsg->version = NFNETLINK_V0;
4109 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
4111 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name))
4112 goto nla_put_failure;
4113 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
4114 goto nla_put_failure;
4116 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
4118 goto nla_put_failure;
4122 args.iter.genmask = nft_genmask_cur(net);
4123 args.iter.skip = cb->args[0];
4124 args.iter.count = 0;
4126 args.iter.fn = nf_tables_dump_setelem;
4127 set->ops->walk(&dump_ctx->ctx, set, &args.iter);
4130 nla_nest_end(skb, nest);
4131 nlmsg_end(skb, nlh);
4133 if (args.iter.err && args.iter.err != -EMSGSIZE)
4134 return args.iter.err;
4135 if (args.iter.count == cb->args[0])
4138 cb->args[0] = args.iter.count;
4146 static int nf_tables_dump_set_start(struct netlink_callback *cb)
4148 struct nft_set_dump_ctx *dump_ctx = cb->data;
4150 cb->data = kmemdup(dump_ctx, sizeof(*dump_ctx), GFP_ATOMIC);
4152 return cb->data ? 0 : -ENOMEM;
4155 static int nf_tables_dump_set_done(struct netlink_callback *cb)
4161 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
4162 const struct nft_ctx *ctx, u32 seq,
4163 u32 portid, int event, u16 flags,
4164 const struct nft_set *set,
4165 const struct nft_set_elem *elem)
4167 struct nfgenmsg *nfmsg;
4168 struct nlmsghdr *nlh;
4169 struct nlattr *nest;
4172 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
4173 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
4176 goto nla_put_failure;
4178 nfmsg = nlmsg_data(nlh);
4179 nfmsg->nfgen_family = ctx->family;
4180 nfmsg->version = NFNETLINK_V0;
4181 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
4183 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
4184 goto nla_put_failure;
4185 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
4186 goto nla_put_failure;
4188 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
4190 goto nla_put_failure;
4192 err = nf_tables_fill_setelem(skb, set, elem);
4194 goto nla_put_failure;
4196 nla_nest_end(skb, nest);
4198 nlmsg_end(skb, nlh);
4202 nlmsg_trim(skb, nlh);
4206 static int nft_setelem_parse_flags(const struct nft_set *set,
4207 const struct nlattr *attr, u32 *flags)
4212 *flags = ntohl(nla_get_be32(attr));
4213 if (*flags & ~NFT_SET_ELEM_INTERVAL_END)
4215 if (!(set->flags & NFT_SET_INTERVAL) &&
4216 *flags & NFT_SET_ELEM_INTERVAL_END)
4222 static int nft_get_set_elem(struct nft_ctx *ctx, struct nft_set *set,
4223 const struct nlattr *attr)
4225 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
4226 struct nft_data_desc desc;
4227 struct nft_set_elem elem;
4228 struct sk_buff *skb;
4233 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
4234 nft_set_elem_policy, NULL);
4238 if (!nla[NFTA_SET_ELEM_KEY])
4241 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
4245 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &desc,
4246 nla[NFTA_SET_ELEM_KEY]);
4251 if (desc.type != NFT_DATA_VALUE || desc.len != set->klen)
4254 priv = set->ops->get(ctx->net, set, &elem, flags);
4256 return PTR_ERR(priv);
4261 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
4265 err = nf_tables_fill_setelem_info(skb, ctx, ctx->seq, ctx->portid,
4266 NFT_MSG_NEWSETELEM, 0, set, &elem);
4270 err = nfnetlink_unicast(skb, ctx->net, ctx->portid, MSG_DONTWAIT);
4271 /* This avoids a loop in nfnetlink. */
4279 /* this avoids a loop in nfnetlink. */
4280 return err == -EAGAIN ? -ENOBUFS : err;
4283 /* called with rcu_read_lock held */
4284 static int nf_tables_getsetelem(struct net *net, struct sock *nlsk,
4285 struct sk_buff *skb, const struct nlmsghdr *nlh,
4286 const struct nlattr * const nla[],
4287 struct netlink_ext_ack *extack)
4289 u8 genmask = nft_genmask_cur(net);
4290 struct nft_set *set;
4291 struct nlattr *attr;
4295 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack,
4300 set = nft_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
4302 return PTR_ERR(set);
4304 if (nlh->nlmsg_flags & NLM_F_DUMP) {
4305 struct netlink_dump_control c = {
4306 .start = nf_tables_dump_set_start,
4307 .dump = nf_tables_dump_set,
4308 .done = nf_tables_dump_set_done,
4309 .module = THIS_MODULE,
4311 struct nft_set_dump_ctx dump_ctx = {
4317 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
4320 if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
4323 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
4324 err = nft_get_set_elem(&ctx, set, attr);
4332 static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
4333 const struct nft_set *set,
4334 const struct nft_set_elem *elem,
4335 int event, u16 flags)
4337 struct net *net = ctx->net;
4338 u32 portid = ctx->portid;
4339 struct sk_buff *skb;
4342 if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
4345 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
4349 err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
4356 nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, ctx->report,
4360 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
4363 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
4365 struct nft_set *set)
4367 struct nft_trans *trans;
4369 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
4373 nft_trans_elem_set(trans) = set;
4377 void *nft_set_elem_init(const struct nft_set *set,
4378 const struct nft_set_ext_tmpl *tmpl,
4379 const u32 *key, const u32 *data,
4380 u64 timeout, u64 expiration, gfp_t gfp)
4382 struct nft_set_ext *ext;
4385 elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
4389 ext = nft_set_elem_ext(set, elem);
4390 nft_set_ext_init(ext, tmpl);
4392 memcpy(nft_set_ext_key(ext), key, set->klen);
4393 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
4394 memcpy(nft_set_ext_data(ext), data, set->dlen);
4395 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
4396 *nft_set_ext_expiration(ext) = get_jiffies_64() + expiration;
4397 if (expiration == 0)
4398 *nft_set_ext_expiration(ext) += timeout;
4400 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
4401 *nft_set_ext_timeout(ext) = timeout;
4406 void nft_set_elem_destroy(const struct nft_set *set, void *elem,
4409 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
4410 struct nft_ctx ctx = {
4411 .net = read_pnet(&set->net),
4412 .family = set->table->family,
4415 nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE);
4416 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
4417 nft_data_release(nft_set_ext_data(ext), set->dtype);
4418 if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPR)) {
4419 struct nft_expr *expr = nft_set_ext_expr(ext);
4421 if (expr->ops->destroy_clone) {
4422 expr->ops->destroy_clone(&ctx, expr);
4423 module_put(expr->ops->type->owner);
4425 nf_tables_expr_destroy(&ctx, expr);
4428 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
4429 (*nft_set_ext_obj(ext))->use--;
4432 EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
4434 /* Only called from commit path, nft_set_elem_deactivate() already deals with
4435 * the refcounting from the preparation phase.
4437 static void nf_tables_set_elem_destroy(const struct nft_ctx *ctx,
4438 const struct nft_set *set, void *elem)
4440 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
4442 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR))
4443 nf_tables_expr_destroy(ctx, nft_set_ext_expr(ext));
4447 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
4448 const struct nlattr *attr, u32 nlmsg_flags)
4450 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
4451 u8 genmask = nft_genmask_next(ctx->net);
4452 struct nft_data_desc d1, d2;
4453 struct nft_set_ext_tmpl tmpl;
4454 struct nft_set_ext *ext, *ext2;
4455 struct nft_set_elem elem;
4456 struct nft_set_binding *binding;
4457 struct nft_object *obj = NULL;
4458 struct nft_userdata *udata;
4459 struct nft_data data;
4460 enum nft_registers dreg;
4461 struct nft_trans *trans;
4468 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
4469 nft_set_elem_policy, NULL);
4473 if (nla[NFTA_SET_ELEM_KEY] == NULL)
4476 nft_set_ext_prepare(&tmpl);
4478 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
4482 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
4484 if (set->flags & NFT_SET_MAP) {
4485 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
4486 !(flags & NFT_SET_ELEM_INTERVAL_END))
4488 if (nla[NFTA_SET_ELEM_DATA] != NULL &&
4489 flags & NFT_SET_ELEM_INTERVAL_END)
4492 if (nla[NFTA_SET_ELEM_DATA] != NULL)
4497 if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
4498 if (!(set->flags & NFT_SET_TIMEOUT))
4500 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_TIMEOUT],
4504 } else if (set->flags & NFT_SET_TIMEOUT) {
4505 timeout = set->timeout;
4509 if (nla[NFTA_SET_ELEM_EXPIRATION] != NULL) {
4510 if (!(set->flags & NFT_SET_TIMEOUT))
4512 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_EXPIRATION],
4518 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &d1,
4519 nla[NFTA_SET_ELEM_KEY]);
4523 if (d1.type != NFT_DATA_VALUE || d1.len != set->klen)
4526 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, d1.len);
4528 nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
4529 if (timeout != set->timeout)
4530 nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
4533 if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
4534 if (!(set->flags & NFT_SET_OBJECT)) {
4538 obj = nft_obj_lookup(ctx->net, ctx->table,
4539 nla[NFTA_SET_ELEM_OBJREF],
4540 set->objtype, genmask);
4545 nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
4548 if (nla[NFTA_SET_ELEM_DATA] != NULL) {
4549 err = nft_data_init(ctx, &data, sizeof(data), &d2,
4550 nla[NFTA_SET_ELEM_DATA]);
4555 if (set->dtype != NFT_DATA_VERDICT && d2.len != set->dlen)
4558 dreg = nft_type_to_reg(set->dtype);
4559 list_for_each_entry(binding, &set->bindings, list) {
4560 struct nft_ctx bind_ctx = {
4562 .family = ctx->family,
4563 .table = ctx->table,
4564 .chain = (struct nft_chain *)binding->chain,
4567 if (!(binding->flags & NFT_SET_MAP))
4570 err = nft_validate_register_store(&bind_ctx, dreg,
4576 if (d2.type == NFT_DATA_VERDICT &&
4577 (data.verdict.code == NFT_GOTO ||
4578 data.verdict.code == NFT_JUMP))
4579 nft_validate_state_update(ctx->net,
4583 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, d2.len);
4586 /* The full maximum length of userdata can exceed the maximum
4587 * offset value (U8_MAX) for following extensions, therefor it
4588 * must be the last extension added.
4591 if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
4592 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
4594 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
4599 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, data.data,
4600 timeout, expiration, GFP_KERNEL);
4601 if (elem.priv == NULL)
4604 ext = nft_set_elem_ext(set, elem.priv);
4606 *nft_set_ext_flags(ext) = flags;
4608 udata = nft_set_ext_userdata(ext);
4609 udata->len = ulen - 1;
4610 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
4613 *nft_set_ext_obj(ext) = obj;
4617 trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
4621 ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK;
4622 err = set->ops->insert(ctx->net, set, &elem, &ext2);
4624 if (err == -EEXIST) {
4625 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^
4626 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) ||
4627 nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^
4628 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF)) {
4632 if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
4633 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
4634 memcmp(nft_set_ext_data(ext),
4635 nft_set_ext_data(ext2), set->dlen) != 0) ||
4636 (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
4637 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
4638 *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
4640 else if (!(nlmsg_flags & NLM_F_EXCL))
4647 !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact)) {
4652 nft_trans_elem(trans) = elem;
4653 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
4657 set->ops->remove(ctx->net, set, &elem);
4665 if (nla[NFTA_SET_ELEM_DATA] != NULL)
4666 nft_data_release(&data, d2.type);
4668 nft_data_release(&elem.key.val, d1.type);
4673 static int nf_tables_newsetelem(struct net *net, struct sock *nlsk,
4674 struct sk_buff *skb, const struct nlmsghdr *nlh,
4675 const struct nlattr * const nla[],
4676 struct netlink_ext_ack *extack)
4678 u8 genmask = nft_genmask_next(net);
4679 const struct nlattr *attr;
4680 struct nft_set *set;
4684 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
4687 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack,
4692 set = nft_set_lookup_global(net, ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
4693 nla[NFTA_SET_ELEM_LIST_SET_ID], genmask);
4695 return PTR_ERR(set);
4697 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
4700 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
4701 err = nft_add_set_elem(&ctx, set, attr, nlh->nlmsg_flags);
4706 if (net->nft.validate_state == NFT_VALIDATE_DO)
4707 return nft_table_validate(net, ctx.table);
4713 * nft_data_hold - hold a nft_data item
4715 * @data: struct nft_data to release
4716 * @type: type of data
4718 * Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded,
4719 * NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and
4720 * NFT_GOTO verdicts. This function must be called on active data objects
4721 * from the second phase of the commit protocol.
4723 void nft_data_hold(const struct nft_data *data, enum nft_data_types type)
4725 if (type == NFT_DATA_VERDICT) {
4726 switch (data->verdict.code) {
4729 data->verdict.chain->use++;
4735 static void nft_set_elem_activate(const struct net *net,
4736 const struct nft_set *set,
4737 struct nft_set_elem *elem)
4739 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4741 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
4742 nft_data_hold(nft_set_ext_data(ext), set->dtype);
4743 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
4744 (*nft_set_ext_obj(ext))->use++;
4747 static void nft_set_elem_deactivate(const struct net *net,
4748 const struct nft_set *set,
4749 struct nft_set_elem *elem)
4751 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4753 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
4754 nft_data_release(nft_set_ext_data(ext), set->dtype);
4755 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
4756 (*nft_set_ext_obj(ext))->use--;
4759 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
4760 const struct nlattr *attr)
4762 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
4763 struct nft_set_ext_tmpl tmpl;
4764 struct nft_data_desc desc;
4765 struct nft_set_elem elem;
4766 struct nft_set_ext *ext;
4767 struct nft_trans *trans;
4772 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
4773 nft_set_elem_policy, NULL);
4778 if (nla[NFTA_SET_ELEM_KEY] == NULL)
4781 nft_set_ext_prepare(&tmpl);
4783 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
4787 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
4789 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &desc,
4790 nla[NFTA_SET_ELEM_KEY]);
4795 if (desc.type != NFT_DATA_VALUE || desc.len != set->klen)
4798 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, desc.len);
4801 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, NULL, 0,
4803 if (elem.priv == NULL)
4806 ext = nft_set_elem_ext(set, elem.priv);
4808 *nft_set_ext_flags(ext) = flags;
4810 trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
4811 if (trans == NULL) {
4816 priv = set->ops->deactivate(ctx->net, set, &elem);
4824 nft_set_elem_deactivate(ctx->net, set, &elem);
4826 nft_trans_elem(trans) = elem;
4827 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
4835 nft_data_release(&elem.key.val, desc.type);
4840 static int nft_flush_set(const struct nft_ctx *ctx,
4841 struct nft_set *set,
4842 const struct nft_set_iter *iter,
4843 struct nft_set_elem *elem)
4845 struct nft_trans *trans;
4848 trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
4849 sizeof(struct nft_trans_elem), GFP_ATOMIC);
4853 if (!set->ops->flush(ctx->net, set, elem->priv)) {
4859 nft_set_elem_deactivate(ctx->net, set, elem);
4860 nft_trans_elem_set(trans) = set;
4861 nft_trans_elem(trans) = *elem;
4862 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
4870 static int nf_tables_delsetelem(struct net *net, struct sock *nlsk,
4871 struct sk_buff *skb, const struct nlmsghdr *nlh,
4872 const struct nlattr * const nla[],
4873 struct netlink_ext_ack *extack)
4875 u8 genmask = nft_genmask_next(net);
4876 const struct nlattr *attr;
4877 struct nft_set *set;
4881 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack,
4886 set = nft_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
4888 return PTR_ERR(set);
4889 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
4892 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL) {
4893 struct nft_set_iter iter = {
4895 .fn = nft_flush_set,
4897 set->ops->walk(&ctx, set, &iter);
4902 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
4903 err = nft_del_setelem(&ctx, set, attr);
4912 void nft_set_gc_batch_release(struct rcu_head *rcu)
4914 struct nft_set_gc_batch *gcb;
4917 gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu);
4918 for (i = 0; i < gcb->head.cnt; i++)
4919 nft_set_elem_destroy(gcb->head.set, gcb->elems[i], true);
4922 EXPORT_SYMBOL_GPL(nft_set_gc_batch_release);
4924 struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
4927 struct nft_set_gc_batch *gcb;
4929 gcb = kzalloc(sizeof(*gcb), gfp);
4932 gcb->head.set = set;
4935 EXPORT_SYMBOL_GPL(nft_set_gc_batch_alloc);
4942 * nft_register_obj- register nf_tables stateful object type
4945 * Registers the object type for use with nf_tables. Returns zero on
4946 * success or a negative errno code otherwise.
4948 int nft_register_obj(struct nft_object_type *obj_type)
4950 if (obj_type->type == NFT_OBJECT_UNSPEC)
4953 nfnl_lock(NFNL_SUBSYS_NFTABLES);
4954 list_add_rcu(&obj_type->list, &nf_tables_objects);
4955 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
4958 EXPORT_SYMBOL_GPL(nft_register_obj);
4961 * nft_unregister_obj - unregister nf_tables object type
4964 * Unregisters the object type for use with nf_tables.
4966 void nft_unregister_obj(struct nft_object_type *obj_type)
4968 nfnl_lock(NFNL_SUBSYS_NFTABLES);
4969 list_del_rcu(&obj_type->list);
4970 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
4972 EXPORT_SYMBOL_GPL(nft_unregister_obj);
4974 struct nft_object *nft_obj_lookup(const struct net *net,
4975 const struct nft_table *table,
4976 const struct nlattr *nla, u32 objtype,
4979 struct nft_object_hash_key k = { .table = table };
4980 char search[NFT_OBJ_MAXNAMELEN];
4981 struct rhlist_head *tmp, *list;
4982 struct nft_object *obj;
4984 nla_strlcpy(search, nla, sizeof(search));
4987 WARN_ON_ONCE(!rcu_read_lock_held() &&
4988 !lockdep_commit_lock_is_held(net));
4991 list = rhltable_lookup(&nft_objname_ht, &k, nft_objname_ht_params);
4995 rhl_for_each_entry_rcu(obj, tmp, list, rhlhead) {
4996 if (objtype == obj->ops->type->type &&
4997 nft_active_genmask(obj, genmask)) {
5004 return ERR_PTR(-ENOENT);
5006 EXPORT_SYMBOL_GPL(nft_obj_lookup);
5008 static struct nft_object *nft_obj_lookup_byhandle(const struct nft_table *table,
5009 const struct nlattr *nla,
5010 u32 objtype, u8 genmask)
5012 struct nft_object *obj;
5014 list_for_each_entry(obj, &table->objects, list) {
5015 if (be64_to_cpu(nla_get_be64(nla)) == obj->handle &&
5016 objtype == obj->ops->type->type &&
5017 nft_active_genmask(obj, genmask))
5020 return ERR_PTR(-ENOENT);
5023 static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
5024 [NFTA_OBJ_TABLE] = { .type = NLA_STRING,
5025 .len = NFT_TABLE_MAXNAMELEN - 1 },
5026 [NFTA_OBJ_NAME] = { .type = NLA_STRING,
5027 .len = NFT_OBJ_MAXNAMELEN - 1 },
5028 [NFTA_OBJ_TYPE] = { .type = NLA_U32 },
5029 [NFTA_OBJ_DATA] = { .type = NLA_NESTED },
5030 [NFTA_OBJ_HANDLE] = { .type = NLA_U64},
5033 static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,
5034 const struct nft_object_type *type,
5035 const struct nlattr *attr)
5038 const struct nft_object_ops *ops;
5039 struct nft_object *obj;
5042 tb = kmalloc_array(type->maxattr + 1, sizeof(*tb), GFP_KERNEL);
5047 err = nla_parse_nested_deprecated(tb, type->maxattr, attr,
5048 type->policy, NULL);
5052 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
5055 if (type->select_ops) {
5056 ops = type->select_ops(ctx, (const struct nlattr * const *)tb);
5066 obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL);
5070 err = ops->init(ctx, (const struct nlattr * const *)tb, obj);
5083 return ERR_PTR(err);
5086 static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
5087 struct nft_object *obj, bool reset)
5089 struct nlattr *nest;
5091 nest = nla_nest_start_noflag(skb, attr);
5093 goto nla_put_failure;
5094 if (obj->ops->dump(skb, obj, reset) < 0)
5095 goto nla_put_failure;
5096 nla_nest_end(skb, nest);
5103 static const struct nft_object_type *__nft_obj_type_get(u32 objtype)
5105 const struct nft_object_type *type;
5107 list_for_each_entry(type, &nf_tables_objects, list) {
5108 if (objtype == type->type)
5114 static const struct nft_object_type *
5115 nft_obj_type_get(struct net *net, u32 objtype)
5117 const struct nft_object_type *type;
5119 type = __nft_obj_type_get(objtype);
5120 if (type != NULL && try_module_get(type->owner))
5123 lockdep_nfnl_nft_mutex_not_held();
5124 #ifdef CONFIG_MODULES
5126 nft_request_module(net, "nft-obj-%u", objtype);
5127 if (__nft_obj_type_get(objtype))
5128 return ERR_PTR(-EAGAIN);
5131 return ERR_PTR(-ENOENT);
5134 static int nf_tables_newobj(struct net *net, struct sock *nlsk,
5135 struct sk_buff *skb, const struct nlmsghdr *nlh,
5136 const struct nlattr * const nla[],
5137 struct netlink_ext_ack *extack)
5139 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
5140 const struct nft_object_type *type;
5141 u8 genmask = nft_genmask_next(net);
5142 int family = nfmsg->nfgen_family;
5143 struct nft_table *table;
5144 struct nft_object *obj;
5149 if (!nla[NFTA_OBJ_TYPE] ||
5150 !nla[NFTA_OBJ_NAME] ||
5151 !nla[NFTA_OBJ_DATA])
5154 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask);
5155 if (IS_ERR(table)) {
5156 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
5157 return PTR_ERR(table);
5160 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
5161 obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
5164 if (err != -ENOENT) {
5165 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
5169 if (nlh->nlmsg_flags & NLM_F_EXCL) {
5170 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
5176 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
5178 type = nft_obj_type_get(net, objtype);
5180 return PTR_ERR(type);
5182 obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]);
5187 obj->key.table = table;
5188 obj->handle = nf_tables_alloc_handle(table);
5190 obj->key.name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL);
5191 if (!obj->key.name) {
5196 err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
5200 err = rhltable_insert(&nft_objname_ht, &obj->rhlhead,
5201 nft_objname_ht_params);
5205 list_add_tail_rcu(&obj->list, &table->objects);
5209 /* queued in transaction log */
5210 INIT_LIST_HEAD(&obj->list);
5213 kfree(obj->key.name);
5215 if (obj->ops->destroy)
5216 obj->ops->destroy(&ctx, obj);
5219 module_put(type->owner);
5223 static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
5224 u32 portid, u32 seq, int event, u32 flags,
5225 int family, const struct nft_table *table,
5226 struct nft_object *obj, bool reset)
5228 struct nfgenmsg *nfmsg;
5229 struct nlmsghdr *nlh;
5231 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
5232 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
5234 goto nla_put_failure;
5236 nfmsg = nlmsg_data(nlh);
5237 nfmsg->nfgen_family = family;
5238 nfmsg->version = NFNETLINK_V0;
5239 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
5241 if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
5242 nla_put_string(skb, NFTA_OBJ_NAME, obj->key.name) ||
5243 nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) ||
5244 nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
5245 nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset) ||
5246 nla_put_be64(skb, NFTA_OBJ_HANDLE, cpu_to_be64(obj->handle),
5248 goto nla_put_failure;
5250 nlmsg_end(skb, nlh);
5254 nlmsg_trim(skb, nlh);
5258 struct nft_obj_filter {
5263 static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
5265 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
5266 const struct nft_table *table;
5267 unsigned int idx = 0, s_idx = cb->args[0];
5268 struct nft_obj_filter *filter = cb->data;
5269 struct net *net = sock_net(skb->sk);
5270 int family = nfmsg->nfgen_family;
5271 struct nft_object *obj;
5274 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
5278 cb->seq = net->nft.base_seq;
5280 list_for_each_entry_rcu(table, &net->nft.tables, list) {
5281 if (family != NFPROTO_UNSPEC && family != table->family)
5284 list_for_each_entry_rcu(obj, &table->objects, list) {
5285 if (!nft_is_active(net, obj))
5290 memset(&cb->args[1], 0,
5291 sizeof(cb->args) - sizeof(cb->args[0]));
5292 if (filter && filter->table &&
5293 strcmp(filter->table, table->name))
5296 filter->type != NFT_OBJECT_UNSPEC &&
5297 obj->ops->type->type != filter->type)
5300 if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid,
5303 NLM_F_MULTI | NLM_F_APPEND,
5304 table->family, table,
5308 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
5320 static int nf_tables_dump_obj_start(struct netlink_callback *cb)
5322 const struct nlattr * const *nla = cb->data;
5323 struct nft_obj_filter *filter = NULL;
5325 if (nla[NFTA_OBJ_TABLE] || nla[NFTA_OBJ_TYPE]) {
5326 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
5330 if (nla[NFTA_OBJ_TABLE]) {
5331 filter->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_ATOMIC);
5332 if (!filter->table) {
5338 if (nla[NFTA_OBJ_TYPE])
5339 filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
5346 static int nf_tables_dump_obj_done(struct netlink_callback *cb)
5348 struct nft_obj_filter *filter = cb->data;
5351 kfree(filter->table);
5358 /* called with rcu_read_lock held */
5359 static int nf_tables_getobj(struct net *net, struct sock *nlsk,
5360 struct sk_buff *skb, const struct nlmsghdr *nlh,
5361 const struct nlattr * const nla[],
5362 struct netlink_ext_ack *extack)
5364 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
5365 u8 genmask = nft_genmask_cur(net);
5366 int family = nfmsg->nfgen_family;
5367 const struct nft_table *table;
5368 struct nft_object *obj;
5369 struct sk_buff *skb2;
5374 if (nlh->nlmsg_flags & NLM_F_DUMP) {
5375 struct netlink_dump_control c = {
5376 .start = nf_tables_dump_obj_start,
5377 .dump = nf_tables_dump_obj,
5378 .done = nf_tables_dump_obj_done,
5379 .module = THIS_MODULE,
5380 .data = (void *)nla,
5383 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
5386 if (!nla[NFTA_OBJ_NAME] ||
5387 !nla[NFTA_OBJ_TYPE])
5390 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask);
5391 if (IS_ERR(table)) {
5392 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
5393 return PTR_ERR(table);
5396 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
5397 obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
5399 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
5400 return PTR_ERR(obj);
5403 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
5407 if (NFNL_MSG_TYPE(nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
5410 err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
5411 nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
5412 family, table, obj, reset);
5416 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
5422 static void nft_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj)
5424 if (obj->ops->destroy)
5425 obj->ops->destroy(ctx, obj);
5427 module_put(obj->ops->type->owner);
5428 kfree(obj->key.name);
5432 static int nf_tables_delobj(struct net *net, struct sock *nlsk,
5433 struct sk_buff *skb, const struct nlmsghdr *nlh,
5434 const struct nlattr * const nla[],
5435 struct netlink_ext_ack *extack)
5437 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
5438 u8 genmask = nft_genmask_next(net);
5439 int family = nfmsg->nfgen_family;
5440 const struct nlattr *attr;
5441 struct nft_table *table;
5442 struct nft_object *obj;
5446 if (!nla[NFTA_OBJ_TYPE] ||
5447 (!nla[NFTA_OBJ_NAME] && !nla[NFTA_OBJ_HANDLE]))
5450 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask);
5451 if (IS_ERR(table)) {
5452 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
5453 return PTR_ERR(table);
5456 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
5457 if (nla[NFTA_OBJ_HANDLE]) {
5458 attr = nla[NFTA_OBJ_HANDLE];
5459 obj = nft_obj_lookup_byhandle(table, attr, objtype, genmask);
5461 attr = nla[NFTA_OBJ_NAME];
5462 obj = nft_obj_lookup(net, table, attr, objtype, genmask);
5466 NL_SET_BAD_ATTR(extack, attr);
5467 return PTR_ERR(obj);
5470 NL_SET_BAD_ATTR(extack, attr);
5474 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
5476 return nft_delobj(&ctx, obj);
5479 void nft_obj_notify(struct net *net, const struct nft_table *table,
5480 struct nft_object *obj, u32 portid, u32 seq, int event,
5481 int family, int report, gfp_t gfp)
5483 struct sk_buff *skb;
5487 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
5490 skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
5494 err = nf_tables_fill_obj_info(skb, net, portid, seq, event, 0, family,
5501 nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, report, gfp);
5504 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
5506 EXPORT_SYMBOL_GPL(nft_obj_notify);
5508 static void nf_tables_obj_notify(const struct nft_ctx *ctx,
5509 struct nft_object *obj, int event)
5511 nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid, ctx->seq, event,
5512 ctx->family, ctx->report, GFP_KERNEL);
5518 void nft_register_flowtable_type(struct nf_flowtable_type *type)
5520 nfnl_lock(NFNL_SUBSYS_NFTABLES);
5521 list_add_tail_rcu(&type->list, &nf_tables_flowtables);
5522 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
5524 EXPORT_SYMBOL_GPL(nft_register_flowtable_type);
5526 void nft_unregister_flowtable_type(struct nf_flowtable_type *type)
5528 nfnl_lock(NFNL_SUBSYS_NFTABLES);
5529 list_del_rcu(&type->list);
5530 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
5532 EXPORT_SYMBOL_GPL(nft_unregister_flowtable_type);
5534 static const struct nla_policy nft_flowtable_policy[NFTA_FLOWTABLE_MAX + 1] = {
5535 [NFTA_FLOWTABLE_TABLE] = { .type = NLA_STRING,
5536 .len = NFT_NAME_MAXLEN - 1 },
5537 [NFTA_FLOWTABLE_NAME] = { .type = NLA_STRING,
5538 .len = NFT_NAME_MAXLEN - 1 },
5539 [NFTA_FLOWTABLE_HOOK] = { .type = NLA_NESTED },
5540 [NFTA_FLOWTABLE_HANDLE] = { .type = NLA_U64 },
5543 struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table,
5544 const struct nlattr *nla, u8 genmask)
5546 struct nft_flowtable *flowtable;
5548 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
5549 if (!nla_strcmp(nla, flowtable->name) &&
5550 nft_active_genmask(flowtable, genmask))
5553 return ERR_PTR(-ENOENT);
5555 EXPORT_SYMBOL_GPL(nft_flowtable_lookup);
5557 static struct nft_flowtable *
5558 nft_flowtable_lookup_byhandle(const struct nft_table *table,
5559 const struct nlattr *nla, u8 genmask)
5561 struct nft_flowtable *flowtable;
5563 list_for_each_entry(flowtable, &table->flowtables, list) {
5564 if (be64_to_cpu(nla_get_be64(nla)) == flowtable->handle &&
5565 nft_active_genmask(flowtable, genmask))
5568 return ERR_PTR(-ENOENT);
5571 static int nf_tables_parse_devices(const struct nft_ctx *ctx,
5572 const struct nlattr *attr,
5573 struct net_device *dev_array[], int *len)
5575 const struct nlattr *tmp;
5576 struct net_device *dev;
5577 char ifname[IFNAMSIZ];
5578 int rem, n = 0, err;
5580 nla_for_each_nested(tmp, attr, rem) {
5581 if (nla_type(tmp) != NFTA_DEVICE_NAME) {
5586 nla_strlcpy(ifname, tmp, IFNAMSIZ);
5587 dev = __dev_get_by_name(ctx->net, ifname);
5593 dev_array[n++] = dev;
5594 if (n == NFT_FLOWTABLE_DEVICE_MAX) {
5608 static const struct nla_policy nft_flowtable_hook_policy[NFTA_FLOWTABLE_HOOK_MAX + 1] = {
5609 [NFTA_FLOWTABLE_HOOK_NUM] = { .type = NLA_U32 },
5610 [NFTA_FLOWTABLE_HOOK_PRIORITY] = { .type = NLA_U32 },
5611 [NFTA_FLOWTABLE_HOOK_DEVS] = { .type = NLA_NESTED },
5614 static int nf_tables_flowtable_parse_hook(const struct nft_ctx *ctx,
5615 const struct nlattr *attr,
5616 struct nft_flowtable *flowtable)
5618 struct net_device *dev_array[NFT_FLOWTABLE_DEVICE_MAX];
5619 struct nlattr *tb[NFTA_FLOWTABLE_HOOK_MAX + 1];
5620 struct nf_hook_ops *ops;
5621 int hooknum, priority;
5624 err = nla_parse_nested_deprecated(tb, NFTA_FLOWTABLE_HOOK_MAX, attr,
5625 nft_flowtable_hook_policy, NULL);
5629 if (!tb[NFTA_FLOWTABLE_HOOK_NUM] ||
5630 !tb[NFTA_FLOWTABLE_HOOK_PRIORITY] ||
5631 !tb[NFTA_FLOWTABLE_HOOK_DEVS])
5634 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
5635 if (hooknum != NF_NETDEV_INGRESS)
5638 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
5640 err = nf_tables_parse_devices(ctx, tb[NFTA_FLOWTABLE_HOOK_DEVS],
5645 ops = kcalloc(n, sizeof(struct nf_hook_ops), GFP_KERNEL);
5649 flowtable->hooknum = hooknum;
5650 flowtable->priority = priority;
5651 flowtable->ops = ops;
5652 flowtable->ops_len = n;
5654 for (i = 0; i < n; i++) {
5655 flowtable->ops[i].pf = NFPROTO_NETDEV;
5656 flowtable->ops[i].hooknum = hooknum;
5657 flowtable->ops[i].priority = priority;
5658 flowtable->ops[i].priv = &flowtable->data;
5659 flowtable->ops[i].hook = flowtable->data.type->hook;
5660 flowtable->ops[i].dev = dev_array[i];
5666 static const struct nf_flowtable_type *__nft_flowtable_type_get(u8 family)
5668 const struct nf_flowtable_type *type;
5670 list_for_each_entry(type, &nf_tables_flowtables, list) {
5671 if (family == type->family)
5677 static const struct nf_flowtable_type *
5678 nft_flowtable_type_get(struct net *net, u8 family)
5680 const struct nf_flowtable_type *type;
5682 type = __nft_flowtable_type_get(family);
5683 if (type != NULL && try_module_get(type->owner))
5686 lockdep_nfnl_nft_mutex_not_held();
5687 #ifdef CONFIG_MODULES
5689 nft_request_module(net, "nf-flowtable-%u", family);
5690 if (__nft_flowtable_type_get(family))
5691 return ERR_PTR(-EAGAIN);
5694 return ERR_PTR(-ENOENT);
5697 static void nft_unregister_flowtable_net_hooks(struct net *net,
5698 struct nft_flowtable *flowtable)
5702 for (i = 0; i < flowtable->ops_len; i++) {
5703 if (!flowtable->ops[i].dev)
5706 nf_unregister_net_hook(net, &flowtable->ops[i]);
5710 static int nf_tables_newflowtable(struct net *net, struct sock *nlsk,
5711 struct sk_buff *skb,
5712 const struct nlmsghdr *nlh,
5713 const struct nlattr * const nla[],
5714 struct netlink_ext_ack *extack)
5716 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
5717 const struct nf_flowtable_type *type;
5718 struct nft_flowtable *flowtable, *ft;
5719 u8 genmask = nft_genmask_next(net);
5720 int family = nfmsg->nfgen_family;
5721 struct nft_table *table;
5725 if (!nla[NFTA_FLOWTABLE_TABLE] ||
5726 !nla[NFTA_FLOWTABLE_NAME] ||
5727 !nla[NFTA_FLOWTABLE_HOOK])
5730 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
5732 if (IS_ERR(table)) {
5733 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
5734 return PTR_ERR(table);
5737 flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
5739 if (IS_ERR(flowtable)) {
5740 err = PTR_ERR(flowtable);
5741 if (err != -ENOENT) {
5742 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
5746 if (nlh->nlmsg_flags & NLM_F_EXCL) {
5747 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
5754 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
5756 flowtable = kzalloc(sizeof(*flowtable), GFP_KERNEL);
5760 flowtable->table = table;
5761 flowtable->handle = nf_tables_alloc_handle(table);
5763 flowtable->name = nla_strdup(nla[NFTA_FLOWTABLE_NAME], GFP_KERNEL);
5764 if (!flowtable->name) {
5769 type = nft_flowtable_type_get(net, family);
5771 err = PTR_ERR(type);
5775 flowtable->data.type = type;
5776 err = type->init(&flowtable->data);
5780 err = nf_tables_flowtable_parse_hook(&ctx, nla[NFTA_FLOWTABLE_HOOK],
5785 for (i = 0; i < flowtable->ops_len; i++) {
5786 if (!flowtable->ops[i].dev)
5789 list_for_each_entry(ft, &table->flowtables, list) {
5790 for (k = 0; k < ft->ops_len; k++) {
5791 if (!ft->ops[k].dev)
5794 if (flowtable->ops[i].dev == ft->ops[k].dev &&
5795 flowtable->ops[i].pf == ft->ops[k].pf) {
5802 err = nf_register_net_hook(net, &flowtable->ops[i]);
5807 err = nft_trans_flowtable_add(&ctx, NFT_MSG_NEWFLOWTABLE, flowtable);
5811 list_add_tail_rcu(&flowtable->list, &table->flowtables);
5816 i = flowtable->ops_len;
5818 for (k = i - 1; k >= 0; k--)
5819 nf_unregister_net_hook(net, &flowtable->ops[k]);
5821 kfree(flowtable->ops);
5823 flowtable->data.type->free(&flowtable->data);
5825 module_put(type->owner);
5827 kfree(flowtable->name);
5833 static int nf_tables_delflowtable(struct net *net, struct sock *nlsk,
5834 struct sk_buff *skb,
5835 const struct nlmsghdr *nlh,
5836 const struct nlattr * const nla[],
5837 struct netlink_ext_ack *extack)
5839 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
5840 u8 genmask = nft_genmask_next(net);
5841 int family = nfmsg->nfgen_family;
5842 struct nft_flowtable *flowtable;
5843 const struct nlattr *attr;
5844 struct nft_table *table;
5847 if (!nla[NFTA_FLOWTABLE_TABLE] ||
5848 (!nla[NFTA_FLOWTABLE_NAME] &&
5849 !nla[NFTA_FLOWTABLE_HANDLE]))
5852 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
5854 if (IS_ERR(table)) {
5855 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
5856 return PTR_ERR(table);
5859 if (nla[NFTA_FLOWTABLE_HANDLE]) {
5860 attr = nla[NFTA_FLOWTABLE_HANDLE];
5861 flowtable = nft_flowtable_lookup_byhandle(table, attr, genmask);
5863 attr = nla[NFTA_FLOWTABLE_NAME];
5864 flowtable = nft_flowtable_lookup(table, attr, genmask);
5867 if (IS_ERR(flowtable)) {
5868 NL_SET_BAD_ATTR(extack, attr);
5869 return PTR_ERR(flowtable);
5871 if (flowtable->use > 0) {
5872 NL_SET_BAD_ATTR(extack, attr);
5876 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
5878 return nft_delflowtable(&ctx, flowtable);
5881 static int nf_tables_fill_flowtable_info(struct sk_buff *skb, struct net *net,
5882 u32 portid, u32 seq, int event,
5883 u32 flags, int family,
5884 struct nft_flowtable *flowtable)
5886 struct nlattr *nest, *nest_devs;
5887 struct nfgenmsg *nfmsg;
5888 struct nlmsghdr *nlh;
5891 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
5892 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
5894 goto nla_put_failure;
5896 nfmsg = nlmsg_data(nlh);
5897 nfmsg->nfgen_family = family;
5898 nfmsg->version = NFNETLINK_V0;
5899 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
5901 if (nla_put_string(skb, NFTA_FLOWTABLE_TABLE, flowtable->table->name) ||
5902 nla_put_string(skb, NFTA_FLOWTABLE_NAME, flowtable->name) ||
5903 nla_put_be32(skb, NFTA_FLOWTABLE_USE, htonl(flowtable->use)) ||
5904 nla_put_be64(skb, NFTA_FLOWTABLE_HANDLE, cpu_to_be64(flowtable->handle),
5905 NFTA_FLOWTABLE_PAD))
5906 goto nla_put_failure;
5908 nest = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK);
5910 goto nla_put_failure;
5911 if (nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_NUM, htonl(flowtable->hooknum)) ||
5912 nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_PRIORITY, htonl(flowtable->priority)))
5913 goto nla_put_failure;
5915 nest_devs = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK_DEVS);
5917 goto nla_put_failure;
5919 for (i = 0; i < flowtable->ops_len; i++) {
5920 const struct net_device *dev = READ_ONCE(flowtable->ops[i].dev);
5923 nla_put_string(skb, NFTA_DEVICE_NAME, dev->name))
5924 goto nla_put_failure;
5926 nla_nest_end(skb, nest_devs);
5927 nla_nest_end(skb, nest);
5929 nlmsg_end(skb, nlh);
5933 nlmsg_trim(skb, nlh);
5937 struct nft_flowtable_filter {
5941 static int nf_tables_dump_flowtable(struct sk_buff *skb,
5942 struct netlink_callback *cb)
5944 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
5945 struct nft_flowtable_filter *filter = cb->data;
5946 unsigned int idx = 0, s_idx = cb->args[0];
5947 struct net *net = sock_net(skb->sk);
5948 int family = nfmsg->nfgen_family;
5949 struct nft_flowtable *flowtable;
5950 const struct nft_table *table;
5953 cb->seq = net->nft.base_seq;
5955 list_for_each_entry_rcu(table, &net->nft.tables, list) {
5956 if (family != NFPROTO_UNSPEC && family != table->family)
5959 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
5960 if (!nft_is_active(net, flowtable))
5965 memset(&cb->args[1], 0,
5966 sizeof(cb->args) - sizeof(cb->args[0]));
5967 if (filter && filter->table &&
5968 strcmp(filter->table, table->name))
5971 if (nf_tables_fill_flowtable_info(skb, net, NETLINK_CB(cb->skb).portid,
5973 NFT_MSG_NEWFLOWTABLE,
5974 NLM_F_MULTI | NLM_F_APPEND,
5975 table->family, flowtable) < 0)
5978 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
5990 static int nf_tables_dump_flowtable_start(struct netlink_callback *cb)
5992 const struct nlattr * const *nla = cb->data;
5993 struct nft_flowtable_filter *filter = NULL;
5995 if (nla[NFTA_FLOWTABLE_TABLE]) {
5996 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
6000 filter->table = nla_strdup(nla[NFTA_FLOWTABLE_TABLE],
6002 if (!filter->table) {
6012 static int nf_tables_dump_flowtable_done(struct netlink_callback *cb)
6014 struct nft_flowtable_filter *filter = cb->data;
6019 kfree(filter->table);
6025 /* called with rcu_read_lock held */
6026 static int nf_tables_getflowtable(struct net *net, struct sock *nlsk,
6027 struct sk_buff *skb,
6028 const struct nlmsghdr *nlh,
6029 const struct nlattr * const nla[],
6030 struct netlink_ext_ack *extack)
6032 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
6033 u8 genmask = nft_genmask_cur(net);
6034 int family = nfmsg->nfgen_family;
6035 struct nft_flowtable *flowtable;
6036 const struct nft_table *table;
6037 struct sk_buff *skb2;
6040 if (nlh->nlmsg_flags & NLM_F_DUMP) {
6041 struct netlink_dump_control c = {
6042 .start = nf_tables_dump_flowtable_start,
6043 .dump = nf_tables_dump_flowtable,
6044 .done = nf_tables_dump_flowtable_done,
6045 .module = THIS_MODULE,
6046 .data = (void *)nla,
6049 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
6052 if (!nla[NFTA_FLOWTABLE_NAME])
6055 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
6058 return PTR_ERR(table);
6060 flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
6062 if (IS_ERR(flowtable))
6063 return PTR_ERR(flowtable);
6065 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
6069 err = nf_tables_fill_flowtable_info(skb2, net, NETLINK_CB(skb).portid,
6071 NFT_MSG_NEWFLOWTABLE, 0, family,
6076 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
6082 static void nf_tables_flowtable_notify(struct nft_ctx *ctx,
6083 struct nft_flowtable *flowtable,
6086 struct sk_buff *skb;
6090 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
6093 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
6097 err = nf_tables_fill_flowtable_info(skb, ctx->net, ctx->portid,
6099 ctx->family, flowtable);
6105 nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
6106 ctx->report, GFP_KERNEL);
6109 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
6112 static void nf_tables_flowtable_destroy(struct nft_flowtable *flowtable)
6114 kfree(flowtable->ops);
6115 kfree(flowtable->name);
6116 flowtable->data.type->free(&flowtable->data);
6117 module_put(flowtable->data.type->owner);
6121 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
6122 u32 portid, u32 seq)
6124 struct nlmsghdr *nlh;
6125 struct nfgenmsg *nfmsg;
6126 char buf[TASK_COMM_LEN];
6127 int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN);
6129 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), 0);
6131 goto nla_put_failure;
6133 nfmsg = nlmsg_data(nlh);
6134 nfmsg->nfgen_family = AF_UNSPEC;
6135 nfmsg->version = NFNETLINK_V0;
6136 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
6138 if (nla_put_be32(skb, NFTA_GEN_ID, htonl(net->nft.base_seq)) ||
6139 nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) ||
6140 nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current)))
6141 goto nla_put_failure;
6143 nlmsg_end(skb, nlh);
6147 nlmsg_trim(skb, nlh);
6151 static void nft_flowtable_event(unsigned long event, struct net_device *dev,
6152 struct nft_flowtable *flowtable)
6156 for (i = 0; i < flowtable->ops_len; i++) {
6157 if (flowtable->ops[i].dev != dev)
6160 nf_unregister_net_hook(dev_net(dev), &flowtable->ops[i]);
6161 flowtable->ops[i].dev = NULL;
6166 static int nf_tables_flowtable_event(struct notifier_block *this,
6167 unsigned long event, void *ptr)
6169 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
6170 struct nft_flowtable *flowtable;
6171 struct nft_table *table;
6174 if (event != NETDEV_UNREGISTER)
6178 mutex_lock(&net->nft.commit_mutex);
6179 list_for_each_entry(table, &net->nft.tables, list) {
6180 list_for_each_entry(flowtable, &table->flowtables, list) {
6181 nft_flowtable_event(event, dev, flowtable);
6184 mutex_unlock(&net->nft.commit_mutex);
6189 static struct notifier_block nf_tables_flowtable_notifier = {
6190 .notifier_call = nf_tables_flowtable_event,
6193 static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
6196 struct nlmsghdr *nlh = nlmsg_hdr(skb);
6197 struct sk_buff *skb2;
6200 if (nlmsg_report(nlh) &&
6201 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
6204 skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
6208 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
6215 nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
6216 nlmsg_report(nlh), GFP_KERNEL);
6219 nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
6223 static int nf_tables_getgen(struct net *net, struct sock *nlsk,
6224 struct sk_buff *skb, const struct nlmsghdr *nlh,
6225 const struct nlattr * const nla[],
6226 struct netlink_ext_ack *extack)
6228 struct sk_buff *skb2;
6231 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
6235 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
6240 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
6246 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
6247 [NFT_MSG_NEWTABLE] = {
6248 .call_batch = nf_tables_newtable,
6249 .attr_count = NFTA_TABLE_MAX,
6250 .policy = nft_table_policy,
6252 [NFT_MSG_GETTABLE] = {
6253 .call_rcu = nf_tables_gettable,
6254 .attr_count = NFTA_TABLE_MAX,
6255 .policy = nft_table_policy,
6257 [NFT_MSG_DELTABLE] = {
6258 .call_batch = nf_tables_deltable,
6259 .attr_count = NFTA_TABLE_MAX,
6260 .policy = nft_table_policy,
6262 [NFT_MSG_NEWCHAIN] = {
6263 .call_batch = nf_tables_newchain,
6264 .attr_count = NFTA_CHAIN_MAX,
6265 .policy = nft_chain_policy,
6267 [NFT_MSG_GETCHAIN] = {
6268 .call_rcu = nf_tables_getchain,
6269 .attr_count = NFTA_CHAIN_MAX,
6270 .policy = nft_chain_policy,
6272 [NFT_MSG_DELCHAIN] = {
6273 .call_batch = nf_tables_delchain,
6274 .attr_count = NFTA_CHAIN_MAX,
6275 .policy = nft_chain_policy,
6277 [NFT_MSG_NEWRULE] = {
6278 .call_batch = nf_tables_newrule,
6279 .attr_count = NFTA_RULE_MAX,
6280 .policy = nft_rule_policy,
6282 [NFT_MSG_GETRULE] = {
6283 .call_rcu = nf_tables_getrule,
6284 .attr_count = NFTA_RULE_MAX,
6285 .policy = nft_rule_policy,
6287 [NFT_MSG_DELRULE] = {
6288 .call_batch = nf_tables_delrule,
6289 .attr_count = NFTA_RULE_MAX,
6290 .policy = nft_rule_policy,
6292 [NFT_MSG_NEWSET] = {
6293 .call_batch = nf_tables_newset,
6294 .attr_count = NFTA_SET_MAX,
6295 .policy = nft_set_policy,
6297 [NFT_MSG_GETSET] = {
6298 .call_rcu = nf_tables_getset,
6299 .attr_count = NFTA_SET_MAX,
6300 .policy = nft_set_policy,
6302 [NFT_MSG_DELSET] = {
6303 .call_batch = nf_tables_delset,
6304 .attr_count = NFTA_SET_MAX,
6305 .policy = nft_set_policy,
6307 [NFT_MSG_NEWSETELEM] = {
6308 .call_batch = nf_tables_newsetelem,
6309 .attr_count = NFTA_SET_ELEM_LIST_MAX,
6310 .policy = nft_set_elem_list_policy,
6312 [NFT_MSG_GETSETELEM] = {
6313 .call_rcu = nf_tables_getsetelem,
6314 .attr_count = NFTA_SET_ELEM_LIST_MAX,
6315 .policy = nft_set_elem_list_policy,
6317 [NFT_MSG_DELSETELEM] = {
6318 .call_batch = nf_tables_delsetelem,
6319 .attr_count = NFTA_SET_ELEM_LIST_MAX,
6320 .policy = nft_set_elem_list_policy,
6322 [NFT_MSG_GETGEN] = {
6323 .call_rcu = nf_tables_getgen,
6325 [NFT_MSG_NEWOBJ] = {
6326 .call_batch = nf_tables_newobj,
6327 .attr_count = NFTA_OBJ_MAX,
6328 .policy = nft_obj_policy,
6330 [NFT_MSG_GETOBJ] = {
6331 .call_rcu = nf_tables_getobj,
6332 .attr_count = NFTA_OBJ_MAX,
6333 .policy = nft_obj_policy,
6335 [NFT_MSG_DELOBJ] = {
6336 .call_batch = nf_tables_delobj,
6337 .attr_count = NFTA_OBJ_MAX,
6338 .policy = nft_obj_policy,
6340 [NFT_MSG_GETOBJ_RESET] = {
6341 .call_rcu = nf_tables_getobj,
6342 .attr_count = NFTA_OBJ_MAX,
6343 .policy = nft_obj_policy,
6345 [NFT_MSG_NEWFLOWTABLE] = {
6346 .call_batch = nf_tables_newflowtable,
6347 .attr_count = NFTA_FLOWTABLE_MAX,
6348 .policy = nft_flowtable_policy,
6350 [NFT_MSG_GETFLOWTABLE] = {
6351 .call_rcu = nf_tables_getflowtable,
6352 .attr_count = NFTA_FLOWTABLE_MAX,
6353 .policy = nft_flowtable_policy,
6355 [NFT_MSG_DELFLOWTABLE] = {
6356 .call_batch = nf_tables_delflowtable,
6357 .attr_count = NFTA_FLOWTABLE_MAX,
6358 .policy = nft_flowtable_policy,
6362 static int nf_tables_validate(struct net *net)
6364 struct nft_table *table;
6366 switch (net->nft.validate_state) {
6367 case NFT_VALIDATE_SKIP:
6369 case NFT_VALIDATE_NEED:
6370 nft_validate_state_update(net, NFT_VALIDATE_DO);
6372 case NFT_VALIDATE_DO:
6373 list_for_each_entry(table, &net->nft.tables, list) {
6374 if (nft_table_validate(net, table) < 0)
6383 /* a drop policy has to be deferred until all rules have been activated,
6384 * otherwise a large ruleset that contains a drop-policy base chain will
6385 * cause all packets to get dropped until the full transaction has been
6388 * We defer the drop policy until the transaction has been finalized.
6390 static void nft_chain_commit_drop_policy(struct nft_trans *trans)
6392 struct nft_base_chain *basechain;
6394 if (nft_trans_chain_policy(trans) != NF_DROP)
6397 if (!nft_is_base_chain(trans->ctx.chain))
6400 basechain = nft_base_chain(trans->ctx.chain);
6401 basechain->policy = NF_DROP;
6404 static void nft_chain_commit_update(struct nft_trans *trans)
6406 struct nft_base_chain *basechain;
6408 if (nft_trans_chain_name(trans)) {
6409 rhltable_remove(&trans->ctx.table->chains_ht,
6410 &trans->ctx.chain->rhlhead,
6411 nft_chain_ht_params);
6412 swap(trans->ctx.chain->name, nft_trans_chain_name(trans));
6413 rhltable_insert_key(&trans->ctx.table->chains_ht,
6414 trans->ctx.chain->name,
6415 &trans->ctx.chain->rhlhead,
6416 nft_chain_ht_params);
6419 if (!nft_is_base_chain(trans->ctx.chain))
6422 nft_chain_stats_replace(trans);
6424 basechain = nft_base_chain(trans->ctx.chain);
6426 switch (nft_trans_chain_policy(trans)) {
6429 basechain->policy = nft_trans_chain_policy(trans);
6434 static void nft_commit_release(struct nft_trans *trans)
6436 switch (trans->msg_type) {
6437 case NFT_MSG_DELTABLE:
6438 nf_tables_table_destroy(&trans->ctx);
6440 case NFT_MSG_NEWCHAIN:
6441 free_percpu(nft_trans_chain_stats(trans));
6442 kfree(nft_trans_chain_name(trans));
6444 case NFT_MSG_DELCHAIN:
6445 nf_tables_chain_destroy(&trans->ctx);
6447 case NFT_MSG_DELRULE:
6448 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
6450 case NFT_MSG_DELSET:
6451 nft_set_destroy(nft_trans_set(trans));
6453 case NFT_MSG_DELSETELEM:
6454 nf_tables_set_elem_destroy(&trans->ctx,
6455 nft_trans_elem_set(trans),
6456 nft_trans_elem(trans).priv);
6458 case NFT_MSG_DELOBJ:
6459 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
6461 case NFT_MSG_DELFLOWTABLE:
6462 nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
6467 put_net(trans->ctx.net);
6472 static void nf_tables_trans_destroy_work(struct work_struct *w)
6474 struct nft_trans *trans, *next;
6477 spin_lock(&nf_tables_destroy_list_lock);
6478 list_splice_init(&nf_tables_destroy_list, &head);
6479 spin_unlock(&nf_tables_destroy_list_lock);
6481 if (list_empty(&head))
6486 list_for_each_entry_safe(trans, next, &head, list) {
6487 list_del(&trans->list);
6488 nft_commit_release(trans);
6492 static int nf_tables_commit_chain_prepare(struct net *net, struct nft_chain *chain)
6494 struct nft_rule *rule;
6495 unsigned int alloc = 0;
6498 /* already handled or inactive chain? */
6499 if (chain->rules_next || !nft_is_active_next(net, chain))
6502 rule = list_entry(&chain->rules, struct nft_rule, list);
6505 list_for_each_entry_continue(rule, &chain->rules, list) {
6506 if (nft_is_active_next(net, rule))
6510 chain->rules_next = nf_tables_chain_alloc_rules(chain, alloc);
6511 if (!chain->rules_next)
6514 list_for_each_entry_continue(rule, &chain->rules, list) {
6515 if (nft_is_active_next(net, rule))
6516 chain->rules_next[i++] = rule;
6519 chain->rules_next[i] = NULL;
6523 static void nf_tables_commit_chain_prepare_cancel(struct net *net)
6525 struct nft_trans *trans, *next;
6527 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
6528 struct nft_chain *chain = trans->ctx.chain;
6530 if (trans->msg_type == NFT_MSG_NEWRULE ||
6531 trans->msg_type == NFT_MSG_DELRULE) {
6532 kvfree(chain->rules_next);
6533 chain->rules_next = NULL;
6538 static void __nf_tables_commit_chain_free_rules_old(struct rcu_head *h)
6540 struct nft_rules_old *o = container_of(h, struct nft_rules_old, h);
6545 static void nf_tables_commit_chain_free_rules_old(struct nft_rule **rules)
6547 struct nft_rule **r = rules;
6548 struct nft_rules_old *old;
6553 r++; /* rcu_head is after end marker */
6557 call_rcu(&old->h, __nf_tables_commit_chain_free_rules_old);
6560 static void nf_tables_commit_chain(struct net *net, struct nft_chain *chain)
6562 struct nft_rule **g0, **g1;
6565 next_genbit = nft_gencursor_next(net);
6567 g0 = rcu_dereference_protected(chain->rules_gen_0,
6568 lockdep_commit_lock_is_held(net));
6569 g1 = rcu_dereference_protected(chain->rules_gen_1,
6570 lockdep_commit_lock_is_held(net));
6572 /* No changes to this chain? */
6573 if (chain->rules_next == NULL) {
6574 /* chain had no change in last or next generation */
6578 * chain had no change in this generation; make sure next
6579 * one uses same rules as current generation.
6582 rcu_assign_pointer(chain->rules_gen_1, g0);
6583 nf_tables_commit_chain_free_rules_old(g1);
6585 rcu_assign_pointer(chain->rules_gen_0, g1);
6586 nf_tables_commit_chain_free_rules_old(g0);
6593 rcu_assign_pointer(chain->rules_gen_1, chain->rules_next);
6595 rcu_assign_pointer(chain->rules_gen_0, chain->rules_next);
6597 chain->rules_next = NULL;
6603 nf_tables_commit_chain_free_rules_old(g1);
6605 nf_tables_commit_chain_free_rules_old(g0);
6608 static void nft_obj_del(struct nft_object *obj)
6610 rhltable_remove(&nft_objname_ht, &obj->rhlhead, nft_objname_ht_params);
6611 list_del_rcu(&obj->list);
6614 static void nft_chain_del(struct nft_chain *chain)
6616 struct nft_table *table = chain->table;
6618 WARN_ON_ONCE(rhltable_remove(&table->chains_ht, &chain->rhlhead,
6619 nft_chain_ht_params));
6620 list_del_rcu(&chain->list);
6623 static void nf_tables_commit_release(struct net *net)
6625 struct nft_trans *trans;
6627 /* all side effects have to be made visible.
6628 * For example, if a chain named 'foo' has been deleted, a
6629 * new transaction must not find it anymore.
6631 * Memory reclaim happens asynchronously from work queue
6632 * to prevent expensive synchronize_rcu() in commit phase.
6634 if (list_empty(&net->nft.commit_list)) {
6635 mutex_unlock(&net->nft.commit_mutex);
6639 trans = list_last_entry(&net->nft.commit_list,
6640 struct nft_trans, list);
6641 get_net(trans->ctx.net);
6642 WARN_ON_ONCE(trans->put_net);
6644 trans->put_net = true;
6645 spin_lock(&nf_tables_destroy_list_lock);
6646 list_splice_tail_init(&net->nft.commit_list, &nf_tables_destroy_list);
6647 spin_unlock(&nf_tables_destroy_list_lock);
6649 mutex_unlock(&net->nft.commit_mutex);
6651 schedule_work(&trans_destroy_work);
6654 static int nf_tables_commit(struct net *net, struct sk_buff *skb)
6656 struct nft_trans *trans, *next;
6657 struct nft_trans_elem *te;
6658 struct nft_chain *chain;
6659 struct nft_table *table;
6662 if (list_empty(&net->nft.commit_list)) {
6663 mutex_unlock(&net->nft.commit_mutex);
6667 /* 0. Validate ruleset, otherwise roll back for error reporting. */
6668 if (nf_tables_validate(net) < 0)
6671 err = nft_flow_rule_offload_commit(net);
6675 /* 1. Allocate space for next generation rules_gen_X[] */
6676 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
6679 if (trans->msg_type == NFT_MSG_NEWRULE ||
6680 trans->msg_type == NFT_MSG_DELRULE) {
6681 chain = trans->ctx.chain;
6683 ret = nf_tables_commit_chain_prepare(net, chain);
6685 nf_tables_commit_chain_prepare_cancel(net);
6691 /* step 2. Make rules_gen_X visible to packet path */
6692 list_for_each_entry(table, &net->nft.tables, list) {
6693 list_for_each_entry(chain, &table->chains, list)
6694 nf_tables_commit_chain(net, chain);
6698 * Bump generation counter, invalidate any dump in progress.
6699 * Cannot fail after this point.
6701 while (++net->nft.base_seq == 0);
6703 /* step 3. Start new generation, rules_gen_X now in use. */
6704 net->nft.gencursor = nft_gencursor_next(net);
6706 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
6707 switch (trans->msg_type) {
6708 case NFT_MSG_NEWTABLE:
6709 if (nft_trans_table_update(trans)) {
6710 if (!nft_trans_table_enable(trans)) {
6711 nf_tables_table_disable(net,
6713 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
6716 nft_clear(net, trans->ctx.table);
6718 nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
6719 nft_trans_destroy(trans);
6721 case NFT_MSG_DELTABLE:
6722 list_del_rcu(&trans->ctx.table->list);
6723 nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE);
6725 case NFT_MSG_NEWCHAIN:
6726 if (nft_trans_chain_update(trans)) {
6727 nft_chain_commit_update(trans);
6728 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
6729 /* trans destroyed after rcu grace period */
6731 nft_chain_commit_drop_policy(trans);
6732 nft_clear(net, trans->ctx.chain);
6733 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
6734 nft_trans_destroy(trans);
6737 case NFT_MSG_DELCHAIN:
6738 nft_chain_del(trans->ctx.chain);
6739 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN);
6740 nf_tables_unregister_hook(trans->ctx.net,
6744 case NFT_MSG_NEWRULE:
6745 nft_clear(trans->ctx.net, nft_trans_rule(trans));
6746 nf_tables_rule_notify(&trans->ctx,
6747 nft_trans_rule(trans),
6749 nft_trans_destroy(trans);
6751 case NFT_MSG_DELRULE:
6752 list_del_rcu(&nft_trans_rule(trans)->list);
6753 nf_tables_rule_notify(&trans->ctx,
6754 nft_trans_rule(trans),
6756 nft_rule_expr_deactivate(&trans->ctx,
6757 nft_trans_rule(trans),
6760 case NFT_MSG_NEWSET:
6761 nft_clear(net, nft_trans_set(trans));
6762 /* This avoids hitting -EBUSY when deleting the table
6763 * from the transaction.
6765 if (nft_set_is_anonymous(nft_trans_set(trans)) &&
6766 !list_empty(&nft_trans_set(trans)->bindings))
6767 trans->ctx.table->use--;
6769 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
6770 NFT_MSG_NEWSET, GFP_KERNEL);
6771 nft_trans_destroy(trans);
6773 case NFT_MSG_DELSET:
6774 list_del_rcu(&nft_trans_set(trans)->list);
6775 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
6776 NFT_MSG_DELSET, GFP_KERNEL);
6778 case NFT_MSG_NEWSETELEM:
6779 te = (struct nft_trans_elem *)trans->data;
6781 te->set->ops->activate(net, te->set, &te->elem);
6782 nf_tables_setelem_notify(&trans->ctx, te->set,
6784 NFT_MSG_NEWSETELEM, 0);
6785 nft_trans_destroy(trans);
6787 case NFT_MSG_DELSETELEM:
6788 te = (struct nft_trans_elem *)trans->data;
6790 nf_tables_setelem_notify(&trans->ctx, te->set,
6792 NFT_MSG_DELSETELEM, 0);
6793 te->set->ops->remove(net, te->set, &te->elem);
6794 atomic_dec(&te->set->nelems);
6797 case NFT_MSG_NEWOBJ:
6798 nft_clear(net, nft_trans_obj(trans));
6799 nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
6801 nft_trans_destroy(trans);
6803 case NFT_MSG_DELOBJ:
6804 nft_obj_del(nft_trans_obj(trans));
6805 nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
6808 case NFT_MSG_NEWFLOWTABLE:
6809 nft_clear(net, nft_trans_flowtable(trans));
6810 nf_tables_flowtable_notify(&trans->ctx,
6811 nft_trans_flowtable(trans),
6812 NFT_MSG_NEWFLOWTABLE);
6813 nft_trans_destroy(trans);
6815 case NFT_MSG_DELFLOWTABLE:
6816 list_del_rcu(&nft_trans_flowtable(trans)->list);
6817 nf_tables_flowtable_notify(&trans->ctx,
6818 nft_trans_flowtable(trans),
6819 NFT_MSG_DELFLOWTABLE);
6820 nft_unregister_flowtable_net_hooks(net,
6821 nft_trans_flowtable(trans));
6826 nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
6827 nf_tables_commit_release(net);
6832 static void nf_tables_abort_release(struct nft_trans *trans)
6834 switch (trans->msg_type) {
6835 case NFT_MSG_NEWTABLE:
6836 nf_tables_table_destroy(&trans->ctx);
6838 case NFT_MSG_NEWCHAIN:
6839 nf_tables_chain_destroy(&trans->ctx);
6841 case NFT_MSG_NEWRULE:
6842 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
6844 case NFT_MSG_NEWSET:
6845 nft_set_destroy(nft_trans_set(trans));
6847 case NFT_MSG_NEWSETELEM:
6848 nft_set_elem_destroy(nft_trans_elem_set(trans),
6849 nft_trans_elem(trans).priv, true);
6851 case NFT_MSG_NEWOBJ:
6852 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
6854 case NFT_MSG_NEWFLOWTABLE:
6855 nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
6861 static int __nf_tables_abort(struct net *net)
6863 struct nft_trans *trans, *next;
6864 struct nft_trans_elem *te;
6866 list_for_each_entry_safe_reverse(trans, next, &net->nft.commit_list,
6868 switch (trans->msg_type) {
6869 case NFT_MSG_NEWTABLE:
6870 if (nft_trans_table_update(trans)) {
6871 if (nft_trans_table_enable(trans)) {
6872 nf_tables_table_disable(net,
6874 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
6876 nft_trans_destroy(trans);
6878 list_del_rcu(&trans->ctx.table->list);
6881 case NFT_MSG_DELTABLE:
6882 nft_clear(trans->ctx.net, trans->ctx.table);
6883 nft_trans_destroy(trans);
6885 case NFT_MSG_NEWCHAIN:
6886 if (nft_trans_chain_update(trans)) {
6887 free_percpu(nft_trans_chain_stats(trans));
6888 kfree(nft_trans_chain_name(trans));
6889 nft_trans_destroy(trans);
6891 trans->ctx.table->use--;
6892 nft_chain_del(trans->ctx.chain);
6893 nf_tables_unregister_hook(trans->ctx.net,
6898 case NFT_MSG_DELCHAIN:
6899 trans->ctx.table->use++;
6900 nft_clear(trans->ctx.net, trans->ctx.chain);
6901 nft_trans_destroy(trans);
6903 case NFT_MSG_NEWRULE:
6904 trans->ctx.chain->use--;
6905 list_del_rcu(&nft_trans_rule(trans)->list);
6906 nft_rule_expr_deactivate(&trans->ctx,
6907 nft_trans_rule(trans),
6910 case NFT_MSG_DELRULE:
6911 trans->ctx.chain->use++;
6912 nft_clear(trans->ctx.net, nft_trans_rule(trans));
6913 nft_rule_expr_activate(&trans->ctx, nft_trans_rule(trans));
6914 nft_trans_destroy(trans);
6916 case NFT_MSG_NEWSET:
6917 trans->ctx.table->use--;
6918 if (nft_trans_set_bound(trans)) {
6919 nft_trans_destroy(trans);
6922 list_del_rcu(&nft_trans_set(trans)->list);
6924 case NFT_MSG_DELSET:
6925 trans->ctx.table->use++;
6926 nft_clear(trans->ctx.net, nft_trans_set(trans));
6927 nft_trans_destroy(trans);
6929 case NFT_MSG_NEWSETELEM:
6930 if (nft_trans_elem_set_bound(trans)) {
6931 nft_trans_destroy(trans);
6934 te = (struct nft_trans_elem *)trans->data;
6935 te->set->ops->remove(net, te->set, &te->elem);
6936 atomic_dec(&te->set->nelems);
6938 case NFT_MSG_DELSETELEM:
6939 te = (struct nft_trans_elem *)trans->data;
6941 nft_set_elem_activate(net, te->set, &te->elem);
6942 te->set->ops->activate(net, te->set, &te->elem);
6945 nft_trans_destroy(trans);
6947 case NFT_MSG_NEWOBJ:
6948 trans->ctx.table->use--;
6949 nft_obj_del(nft_trans_obj(trans));
6951 case NFT_MSG_DELOBJ:
6952 trans->ctx.table->use++;
6953 nft_clear(trans->ctx.net, nft_trans_obj(trans));
6954 nft_trans_destroy(trans);
6956 case NFT_MSG_NEWFLOWTABLE:
6957 trans->ctx.table->use--;
6958 list_del_rcu(&nft_trans_flowtable(trans)->list);
6959 nft_unregister_flowtable_net_hooks(net,
6960 nft_trans_flowtable(trans));
6962 case NFT_MSG_DELFLOWTABLE:
6963 trans->ctx.table->use++;
6964 nft_clear(trans->ctx.net, nft_trans_flowtable(trans));
6965 nft_trans_destroy(trans);
6972 list_for_each_entry_safe_reverse(trans, next,
6973 &net->nft.commit_list, list) {
6974 list_del(&trans->list);
6975 nf_tables_abort_release(trans);
6981 static void nf_tables_cleanup(struct net *net)
6983 nft_validate_state_update(net, NFT_VALIDATE_SKIP);
6986 static int nf_tables_abort(struct net *net, struct sk_buff *skb)
6988 int ret = __nf_tables_abort(net);
6990 mutex_unlock(&net->nft.commit_mutex);
6995 static bool nf_tables_valid_genid(struct net *net, u32 genid)
6999 mutex_lock(&net->nft.commit_mutex);
7001 genid_ok = genid == 0 || net->nft.base_seq == genid;
7003 mutex_unlock(&net->nft.commit_mutex);
7005 /* else, commit mutex has to be released by commit or abort function */
7009 static const struct nfnetlink_subsystem nf_tables_subsys = {
7010 .name = "nf_tables",
7011 .subsys_id = NFNL_SUBSYS_NFTABLES,
7012 .cb_count = NFT_MSG_MAX,
7014 .commit = nf_tables_commit,
7015 .abort = nf_tables_abort,
7016 .cleanup = nf_tables_cleanup,
7017 .valid_genid = nf_tables_valid_genid,
7018 .owner = THIS_MODULE,
7021 int nft_chain_validate_dependency(const struct nft_chain *chain,
7022 enum nft_chain_types type)
7024 const struct nft_base_chain *basechain;
7026 if (nft_is_base_chain(chain)) {
7027 basechain = nft_base_chain(chain);
7028 if (basechain->type->type != type)
7033 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
7035 int nft_chain_validate_hooks(const struct nft_chain *chain,
7036 unsigned int hook_flags)
7038 struct nft_base_chain *basechain;
7040 if (nft_is_base_chain(chain)) {
7041 basechain = nft_base_chain(chain);
7043 if ((1 << basechain->ops.hooknum) & hook_flags)
7051 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
7054 * Loop detection - walk through the ruleset beginning at the destination chain
7055 * of a new jump until either the source chain is reached (loop) or all
7056 * reachable chains have been traversed.
7058 * The loop check is performed whenever a new jump verdict is added to an
7059 * expression or verdict map or a verdict map is bound to a new chain.
7062 static int nf_tables_check_loops(const struct nft_ctx *ctx,
7063 const struct nft_chain *chain);
7065 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
7066 struct nft_set *set,
7067 const struct nft_set_iter *iter,
7068 struct nft_set_elem *elem)
7070 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
7071 const struct nft_data *data;
7073 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
7074 *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
7077 data = nft_set_ext_data(ext);
7078 switch (data->verdict.code) {
7081 return nf_tables_check_loops(ctx, data->verdict.chain);
7087 static int nf_tables_check_loops(const struct nft_ctx *ctx,
7088 const struct nft_chain *chain)
7090 const struct nft_rule *rule;
7091 const struct nft_expr *expr, *last;
7092 struct nft_set *set;
7093 struct nft_set_binding *binding;
7094 struct nft_set_iter iter;
7096 if (ctx->chain == chain)
7099 list_for_each_entry(rule, &chain->rules, list) {
7100 nft_rule_for_each_expr(expr, last, rule) {
7101 struct nft_immediate_expr *priv;
7102 const struct nft_data *data;
7105 if (strcmp(expr->ops->type->name, "immediate"))
7108 priv = nft_expr_priv(expr);
7109 if (priv->dreg != NFT_REG_VERDICT)
7113 switch (data->verdict.code) {
7116 err = nf_tables_check_loops(ctx,
7117 data->verdict.chain);
7126 list_for_each_entry(set, &ctx->table->sets, list) {
7127 if (!nft_is_active_next(ctx->net, set))
7129 if (!(set->flags & NFT_SET_MAP) ||
7130 set->dtype != NFT_DATA_VERDICT)
7133 list_for_each_entry(binding, &set->bindings, list) {
7134 if (!(binding->flags & NFT_SET_MAP) ||
7135 binding->chain != chain)
7138 iter.genmask = nft_genmask_next(ctx->net);
7142 iter.fn = nf_tables_loop_check_setelem;
7144 set->ops->walk(ctx, set, &iter);
7154 * nft_parse_u32_check - fetch u32 attribute and check for maximum value
7156 * @attr: netlink attribute to fetch value from
7157 * @max: maximum value to be stored in dest
7158 * @dest: pointer to the variable
7160 * Parse, check and store a given u32 netlink attribute into variable.
7161 * This function returns -ERANGE if the value goes over maximum value.
7162 * Otherwise a 0 is returned and the attribute value is stored in the
7163 * destination variable.
7165 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
7169 val = ntohl(nla_get_be32(attr));
7176 EXPORT_SYMBOL_GPL(nft_parse_u32_check);
7179 * nft_parse_register - parse a register value from a netlink attribute
7181 * @attr: netlink attribute
7183 * Parse and translate a register value from a netlink attribute.
7184 * Registers used to be 128 bit wide, these register numbers will be
7185 * mapped to the corresponding 32 bit register numbers.
7187 unsigned int nft_parse_register(const struct nlattr *attr)
7191 reg = ntohl(nla_get_be32(attr));
7193 case NFT_REG_VERDICT...NFT_REG_4:
7194 return reg * NFT_REG_SIZE / NFT_REG32_SIZE;
7196 return reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
7199 EXPORT_SYMBOL_GPL(nft_parse_register);
7202 * nft_dump_register - dump a register value to a netlink attribute
7204 * @skb: socket buffer
7205 * @attr: attribute number
7206 * @reg: register number
7208 * Construct a netlink attribute containing the register number. For
7209 * compatibility reasons, register numbers being a multiple of 4 are
7210 * translated to the corresponding 128 bit register numbers.
7212 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
7214 if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
7215 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
7217 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
7219 return nla_put_be32(skb, attr, htonl(reg));
7221 EXPORT_SYMBOL_GPL(nft_dump_register);
7224 * nft_validate_register_load - validate a load from a register
7226 * @reg: the register number
7227 * @len: the length of the data
7229 * Validate that the input register is one of the general purpose
7230 * registers and that the length of the load is within the bounds.
7232 int nft_validate_register_load(enum nft_registers reg, unsigned int len)
7234 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
7238 if (reg * NFT_REG32_SIZE + len > FIELD_SIZEOF(struct nft_regs, data))
7243 EXPORT_SYMBOL_GPL(nft_validate_register_load);
7246 * nft_validate_register_store - validate an expressions' register store
7248 * @ctx: context of the expression performing the load
7249 * @reg: the destination register number
7250 * @data: the data to load
7251 * @type: the data type
7252 * @len: the length of the data
7254 * Validate that a data load uses the appropriate data type for
7255 * the destination register and the length is within the bounds.
7256 * A value of NULL for the data means that its runtime gathered
7259 int nft_validate_register_store(const struct nft_ctx *ctx,
7260 enum nft_registers reg,
7261 const struct nft_data *data,
7262 enum nft_data_types type, unsigned int len)
7267 case NFT_REG_VERDICT:
7268 if (type != NFT_DATA_VERDICT)
7272 (data->verdict.code == NFT_GOTO ||
7273 data->verdict.code == NFT_JUMP)) {
7274 err = nf_tables_check_loops(ctx, data->verdict.chain);
7281 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
7285 if (reg * NFT_REG32_SIZE + len >
7286 FIELD_SIZEOF(struct nft_regs, data))
7289 if (data != NULL && type != NFT_DATA_VALUE)
7294 EXPORT_SYMBOL_GPL(nft_validate_register_store);
7296 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
7297 [NFTA_VERDICT_CODE] = { .type = NLA_U32 },
7298 [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING,
7299 .len = NFT_CHAIN_MAXNAMELEN - 1 },
7302 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
7303 struct nft_data_desc *desc, const struct nlattr *nla)
7305 u8 genmask = nft_genmask_next(ctx->net);
7306 struct nlattr *tb[NFTA_VERDICT_MAX + 1];
7307 struct nft_chain *chain;
7310 err = nla_parse_nested_deprecated(tb, NFTA_VERDICT_MAX, nla,
7311 nft_verdict_policy, NULL);
7315 if (!tb[NFTA_VERDICT_CODE])
7317 data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
7319 switch (data->verdict.code) {
7321 switch (data->verdict.code & NF_VERDICT_MASK) {
7336 if (!tb[NFTA_VERDICT_CHAIN])
7338 chain = nft_chain_lookup(ctx->net, ctx->table,
7339 tb[NFTA_VERDICT_CHAIN], genmask);
7341 return PTR_ERR(chain);
7342 if (nft_is_base_chain(chain))
7346 data->verdict.chain = chain;
7350 desc->len = sizeof(data->verdict);
7351 desc->type = NFT_DATA_VERDICT;
7355 static void nft_verdict_uninit(const struct nft_data *data)
7357 switch (data->verdict.code) {
7360 data->verdict.chain->use--;
7365 int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
7367 struct nlattr *nest;
7369 nest = nla_nest_start_noflag(skb, type);
7371 goto nla_put_failure;
7373 if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
7374 goto nla_put_failure;
7379 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
7381 goto nla_put_failure;
7383 nla_nest_end(skb, nest);
7390 static int nft_value_init(const struct nft_ctx *ctx,
7391 struct nft_data *data, unsigned int size,
7392 struct nft_data_desc *desc, const struct nlattr *nla)
7402 nla_memcpy(data->data, nla, len);
7403 desc->type = NFT_DATA_VALUE;
7408 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
7411 return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
7414 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
7415 [NFTA_DATA_VALUE] = { .type = NLA_BINARY },
7416 [NFTA_DATA_VERDICT] = { .type = NLA_NESTED },
7420 * nft_data_init - parse nf_tables data netlink attributes
7422 * @ctx: context of the expression using the data
7423 * @data: destination struct nft_data
7424 * @size: maximum data length
7425 * @desc: data description
7426 * @nla: netlink attribute containing data
7428 * Parse the netlink data attributes and initialize a struct nft_data.
7429 * The type and length of data are returned in the data description.
7431 * The caller can indicate that it only wants to accept data of type
7432 * NFT_DATA_VALUE by passing NULL for the ctx argument.
7434 int nft_data_init(const struct nft_ctx *ctx,
7435 struct nft_data *data, unsigned int size,
7436 struct nft_data_desc *desc, const struct nlattr *nla)
7438 struct nlattr *tb[NFTA_DATA_MAX + 1];
7441 err = nla_parse_nested_deprecated(tb, NFTA_DATA_MAX, nla,
7442 nft_data_policy, NULL);
7446 if (tb[NFTA_DATA_VALUE])
7447 return nft_value_init(ctx, data, size, desc,
7448 tb[NFTA_DATA_VALUE]);
7449 if (tb[NFTA_DATA_VERDICT] && ctx != NULL)
7450 return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
7453 EXPORT_SYMBOL_GPL(nft_data_init);
7456 * nft_data_release - release a nft_data item
7458 * @data: struct nft_data to release
7459 * @type: type of data
7461 * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
7462 * all others need to be released by calling this function.
7464 void nft_data_release(const struct nft_data *data, enum nft_data_types type)
7466 if (type < NFT_DATA_VERDICT)
7469 case NFT_DATA_VERDICT:
7470 return nft_verdict_uninit(data);
7475 EXPORT_SYMBOL_GPL(nft_data_release);
7477 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
7478 enum nft_data_types type, unsigned int len)
7480 struct nlattr *nest;
7483 nest = nla_nest_start_noflag(skb, attr);
7488 case NFT_DATA_VALUE:
7489 err = nft_value_dump(skb, data, len);
7491 case NFT_DATA_VERDICT:
7492 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
7499 nla_nest_end(skb, nest);
7502 EXPORT_SYMBOL_GPL(nft_data_dump);
7504 int __nft_release_basechain(struct nft_ctx *ctx)
7506 struct nft_rule *rule, *nr;
7508 if (WARN_ON(!nft_is_base_chain(ctx->chain)))
7511 nf_tables_unregister_hook(ctx->net, ctx->chain->table, ctx->chain);
7512 list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
7513 list_del(&rule->list);
7515 nf_tables_rule_release(ctx, rule);
7517 nft_chain_del(ctx->chain);
7519 nf_tables_chain_destroy(ctx);
7523 EXPORT_SYMBOL_GPL(__nft_release_basechain);
7525 static void __nft_release_tables(struct net *net)
7527 struct nft_flowtable *flowtable, *nf;
7528 struct nft_table *table, *nt;
7529 struct nft_chain *chain, *nc;
7530 struct nft_object *obj, *ne;
7531 struct nft_rule *rule, *nr;
7532 struct nft_set *set, *ns;
7533 struct nft_ctx ctx = {
7535 .family = NFPROTO_NETDEV,
7538 list_for_each_entry_safe(table, nt, &net->nft.tables, list) {
7539 ctx.family = table->family;
7541 list_for_each_entry(chain, &table->chains, list)
7542 nf_tables_unregister_hook(net, table, chain);
7543 /* No packets are walking on these chains anymore. */
7545 list_for_each_entry(chain, &table->chains, list) {
7547 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
7548 list_del(&rule->list);
7550 nf_tables_rule_release(&ctx, rule);
7553 list_for_each_entry_safe(flowtable, nf, &table->flowtables, list) {
7554 list_del(&flowtable->list);
7556 nf_tables_flowtable_destroy(flowtable);
7558 list_for_each_entry_safe(set, ns, &table->sets, list) {
7559 list_del(&set->list);
7561 nft_set_destroy(set);
7563 list_for_each_entry_safe(obj, ne, &table->objects, list) {
7566 nft_obj_destroy(&ctx, obj);
7568 list_for_each_entry_safe(chain, nc, &table->chains, list) {
7570 nft_chain_del(chain);
7572 nf_tables_chain_destroy(&ctx);
7574 list_del(&table->list);
7575 nf_tables_table_destroy(&ctx);
7579 static int __net_init nf_tables_init_net(struct net *net)
7581 INIT_LIST_HEAD(&net->nft.tables);
7582 INIT_LIST_HEAD(&net->nft.commit_list);
7583 mutex_init(&net->nft.commit_mutex);
7584 net->nft.base_seq = 1;
7585 net->nft.validate_state = NFT_VALIDATE_SKIP;
7590 static void __net_exit nf_tables_exit_net(struct net *net)
7592 mutex_lock(&net->nft.commit_mutex);
7593 if (!list_empty(&net->nft.commit_list))
7594 __nf_tables_abort(net);
7595 __nft_release_tables(net);
7596 mutex_unlock(&net->nft.commit_mutex);
7597 WARN_ON_ONCE(!list_empty(&net->nft.tables));
7600 static struct pernet_operations nf_tables_net_ops = {
7601 .init = nf_tables_init_net,
7602 .exit = nf_tables_exit_net,
7605 static struct flow_indr_block_ing_entry block_ing_entry = {
7606 .cb = nft_indr_block_get_and_ing_cmd,
7607 .list = LIST_HEAD_INIT(block_ing_entry.list),
7610 static int __init nf_tables_module_init(void)
7614 spin_lock_init(&nf_tables_destroy_list_lock);
7615 err = register_pernet_subsys(&nf_tables_net_ops);
7619 err = nft_chain_filter_init();
7623 err = nf_tables_core_module_init();
7627 err = register_netdevice_notifier(&nf_tables_flowtable_notifier);
7631 err = rhltable_init(&nft_objname_ht, &nft_objname_ht_params);
7636 err = nfnetlink_subsys_register(&nf_tables_subsys);
7640 nft_chain_route_init();
7641 flow_indr_add_block_ing_cb(&block_ing_entry);
7644 rhltable_destroy(&nft_objname_ht);
7646 unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
7648 nf_tables_core_module_exit();
7650 nft_chain_filter_fini();
7652 unregister_pernet_subsys(&nf_tables_net_ops);
7656 static void __exit nf_tables_module_exit(void)
7658 flow_indr_del_block_ing_cb(&block_ing_entry);
7659 nfnetlink_subsys_unregister(&nf_tables_subsys);
7660 unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
7661 nft_chain_filter_fini();
7662 nft_chain_route_fini();
7663 unregister_pernet_subsys(&nf_tables_net_ops);
7664 cancel_work_sync(&trans_destroy_work);
7666 rhltable_destroy(&nft_objname_ht);
7667 nf_tables_core_module_exit();
7670 module_init(nf_tables_module_init);
7671 module_exit(nf_tables_module_exit);
7673 MODULE_LICENSE("GPL");
7674 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
7675 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);