2 * Copyright (c) 2007-2009 Patrick McHardy <kaber@trash.net>
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
8 * Development of this code funded by Astaro AG (http://www.astaro.com/)
11 #include <linux/module.h>
12 #include <linux/init.h>
13 #include <linux/list.h>
14 #include <linux/skbuff.h>
15 #include <linux/netlink.h>
16 #include <linux/vmalloc.h>
17 #include <linux/rhashtable.h>
18 #include <linux/netfilter.h>
19 #include <linux/netfilter/nfnetlink.h>
20 #include <linux/netfilter/nf_tables.h>
21 #include <net/netfilter/nf_flow_table.h>
22 #include <net/netfilter/nf_tables_core.h>
23 #include <net/netfilter/nf_tables.h>
24 #include <net/net_namespace.h>
27 #define NFT_MODULE_AUTOLOAD_LIMIT (MODULE_NAME_LEN - sizeof("nft-expr-255-"))
29 static LIST_HEAD(nf_tables_expressions);
30 static LIST_HEAD(nf_tables_objects);
31 static LIST_HEAD(nf_tables_flowtables);
32 static u64 table_handle;
35 NFT_VALIDATE_SKIP = 0,
40 static u32 nft_chain_hash(const void *data, u32 len, u32 seed);
41 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed);
42 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *, const void *);
44 static const struct rhashtable_params nft_chain_ht_params = {
45 .head_offset = offsetof(struct nft_chain, rhlhead),
46 .key_offset = offsetof(struct nft_chain, name),
47 .hashfn = nft_chain_hash,
48 .obj_hashfn = nft_chain_hash_obj,
49 .obj_cmpfn = nft_chain_hash_cmp,
51 .automatic_shrinking = true,
54 static void nft_validate_state_update(struct net *net, u8 new_validate_state)
56 switch (net->nft.validate_state) {
57 case NFT_VALIDATE_SKIP:
58 WARN_ON_ONCE(new_validate_state == NFT_VALIDATE_DO);
60 case NFT_VALIDATE_NEED:
63 if (new_validate_state == NFT_VALIDATE_NEED)
67 net->nft.validate_state = new_validate_state;
70 static void nft_ctx_init(struct nft_ctx *ctx,
72 const struct sk_buff *skb,
73 const struct nlmsghdr *nlh,
75 struct nft_table *table,
76 struct nft_chain *chain,
77 const struct nlattr * const *nla)
85 ctx->portid = NETLINK_CB(skb).portid;
86 ctx->report = nlmsg_report(nlh);
87 ctx->seq = nlh->nlmsg_seq;
90 static struct nft_trans *nft_trans_alloc_gfp(const struct nft_ctx *ctx,
91 int msg_type, u32 size, gfp_t gfp)
93 struct nft_trans *trans;
95 trans = kzalloc(sizeof(struct nft_trans) + size, gfp);
99 trans->msg_type = msg_type;
105 static struct nft_trans *nft_trans_alloc(const struct nft_ctx *ctx,
106 int msg_type, u32 size)
108 return nft_trans_alloc_gfp(ctx, msg_type, size, GFP_KERNEL);
111 static void nft_trans_destroy(struct nft_trans *trans)
113 list_del(&trans->list);
117 static void nft_set_trans_bind(const struct nft_ctx *ctx, struct nft_set *set)
119 struct net *net = ctx->net;
120 struct nft_trans *trans;
122 if (!nft_set_is_anonymous(set))
125 list_for_each_entry_reverse(trans, &net->nft.commit_list, list) {
126 switch (trans->msg_type) {
128 if (nft_trans_set(trans) == set)
129 nft_trans_set_bound(trans) = true;
131 case NFT_MSG_NEWSETELEM:
132 if (nft_trans_elem_set(trans) == set)
133 nft_trans_elem_set_bound(trans) = true;
139 static int nf_tables_register_hook(struct net *net,
140 const struct nft_table *table,
141 struct nft_chain *chain)
143 const struct nft_base_chain *basechain;
144 const struct nf_hook_ops *ops;
146 if (table->flags & NFT_TABLE_F_DORMANT ||
147 !nft_is_base_chain(chain))
150 basechain = nft_base_chain(chain);
151 ops = &basechain->ops;
153 if (basechain->type->ops_register)
154 return basechain->type->ops_register(net, ops);
156 return nf_register_net_hook(net, ops);
159 static void nf_tables_unregister_hook(struct net *net,
160 const struct nft_table *table,
161 struct nft_chain *chain)
163 const struct nft_base_chain *basechain;
164 const struct nf_hook_ops *ops;
166 if (table->flags & NFT_TABLE_F_DORMANT ||
167 !nft_is_base_chain(chain))
169 basechain = nft_base_chain(chain);
170 ops = &basechain->ops;
172 if (basechain->type->ops_unregister)
173 return basechain->type->ops_unregister(net, ops);
175 nf_unregister_net_hook(net, ops);
178 static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type)
180 struct nft_trans *trans;
182 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table));
186 if (msg_type == NFT_MSG_NEWTABLE)
187 nft_activate_next(ctx->net, ctx->table);
189 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
193 static int nft_deltable(struct nft_ctx *ctx)
197 err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE);
201 nft_deactivate_next(ctx->net, ctx->table);
205 static int nft_trans_chain_add(struct nft_ctx *ctx, int msg_type)
207 struct nft_trans *trans;
209 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain));
213 if (msg_type == NFT_MSG_NEWCHAIN)
214 nft_activate_next(ctx->net, ctx->chain);
216 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
220 static int nft_delchain(struct nft_ctx *ctx)
224 err = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN);
229 nft_deactivate_next(ctx->net, ctx->chain);
234 static void nft_rule_expr_activate(const struct nft_ctx *ctx,
235 struct nft_rule *rule)
237 struct nft_expr *expr;
239 expr = nft_expr_first(rule);
240 while (expr != nft_expr_last(rule) && expr->ops) {
241 if (expr->ops->activate)
242 expr->ops->activate(ctx, expr);
244 expr = nft_expr_next(expr);
248 static void nft_rule_expr_deactivate(const struct nft_ctx *ctx,
249 struct nft_rule *rule,
250 enum nft_trans_phase phase)
252 struct nft_expr *expr;
254 expr = nft_expr_first(rule);
255 while (expr != nft_expr_last(rule) && expr->ops) {
256 if (expr->ops->deactivate)
257 expr->ops->deactivate(ctx, expr, phase);
259 expr = nft_expr_next(expr);
264 nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule)
266 /* You cannot delete the same rule twice */
267 if (nft_is_active_next(ctx->net, rule)) {
268 nft_deactivate_next(ctx->net, rule);
275 static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type,
276 struct nft_rule *rule)
278 struct nft_trans *trans;
280 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule));
284 if (msg_type == NFT_MSG_NEWRULE && ctx->nla[NFTA_RULE_ID] != NULL) {
285 nft_trans_rule_id(trans) =
286 ntohl(nla_get_be32(ctx->nla[NFTA_RULE_ID]));
288 nft_trans_rule(trans) = rule;
289 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
294 static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule)
296 struct nft_trans *trans;
299 trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule);
303 err = nf_tables_delrule_deactivate(ctx, rule);
305 nft_trans_destroy(trans);
308 nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_PREPARE);
313 static int nft_delrule_by_chain(struct nft_ctx *ctx)
315 struct nft_rule *rule;
318 list_for_each_entry(rule, &ctx->chain->rules, list) {
319 if (!nft_is_active_next(ctx->net, rule))
322 err = nft_delrule(ctx, rule);
329 static int nft_trans_set_add(const struct nft_ctx *ctx, int msg_type,
332 struct nft_trans *trans;
334 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
338 if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] != NULL) {
339 nft_trans_set_id(trans) =
340 ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
341 nft_activate_next(ctx->net, set);
343 nft_trans_set(trans) = set;
344 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
349 static int nft_delset(const struct nft_ctx *ctx, struct nft_set *set)
353 err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set);
357 nft_deactivate_next(ctx->net, set);
363 static int nft_trans_obj_add(struct nft_ctx *ctx, int msg_type,
364 struct nft_object *obj)
366 struct nft_trans *trans;
368 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_obj));
372 if (msg_type == NFT_MSG_NEWOBJ)
373 nft_activate_next(ctx->net, obj);
375 nft_trans_obj(trans) = obj;
376 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
381 static int nft_delobj(struct nft_ctx *ctx, struct nft_object *obj)
385 err = nft_trans_obj_add(ctx, NFT_MSG_DELOBJ, obj);
389 nft_deactivate_next(ctx->net, obj);
395 static int nft_trans_flowtable_add(struct nft_ctx *ctx, int msg_type,
396 struct nft_flowtable *flowtable)
398 struct nft_trans *trans;
400 trans = nft_trans_alloc(ctx, msg_type,
401 sizeof(struct nft_trans_flowtable));
405 if (msg_type == NFT_MSG_NEWFLOWTABLE)
406 nft_activate_next(ctx->net, flowtable);
408 nft_trans_flowtable(trans) = flowtable;
409 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
414 static int nft_delflowtable(struct nft_ctx *ctx,
415 struct nft_flowtable *flowtable)
419 err = nft_trans_flowtable_add(ctx, NFT_MSG_DELFLOWTABLE, flowtable);
423 nft_deactivate_next(ctx->net, flowtable);
433 static struct nft_table *nft_table_lookup(const struct net *net,
434 const struct nlattr *nla,
435 u8 family, u8 genmask)
437 struct nft_table *table;
440 return ERR_PTR(-EINVAL);
442 list_for_each_entry_rcu(table, &net->nft.tables, list) {
443 if (!nla_strcmp(nla, table->name) &&
444 table->family == family &&
445 nft_active_genmask(table, genmask))
449 return ERR_PTR(-ENOENT);
452 static struct nft_table *nft_table_lookup_byhandle(const struct net *net,
453 const struct nlattr *nla,
456 struct nft_table *table;
458 list_for_each_entry(table, &net->nft.tables, list) {
459 if (be64_to_cpu(nla_get_be64(nla)) == table->handle &&
460 nft_active_genmask(table, genmask))
464 return ERR_PTR(-ENOENT);
467 static inline u64 nf_tables_alloc_handle(struct nft_table *table)
469 return ++table->hgenerator;
472 static const struct nft_chain_type *chain_type[NFPROTO_NUMPROTO][NFT_CHAIN_T_MAX];
474 static const struct nft_chain_type *
475 __nft_chain_type_get(u8 family, enum nft_chain_types type)
477 if (family >= NFPROTO_NUMPROTO ||
478 type >= NFT_CHAIN_T_MAX)
481 return chain_type[family][type];
484 static const struct nft_chain_type *
485 __nf_tables_chain_type_lookup(const struct nlattr *nla, u8 family)
487 const struct nft_chain_type *type;
490 for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
491 type = __nft_chain_type_get(family, i);
494 if (!nla_strcmp(nla, type->name))
501 * Loading a module requires dropping mutex that guards the transaction.
502 * A different client might race to start a new transaction meanwhile. Zap the
503 * list of pending transaction and then restore it once the mutex is grabbed
504 * again. Users of this function return EAGAIN which implicitly triggers the
505 * transaction abort path to clean up the list of pending transactions.
507 #ifdef CONFIG_MODULES
508 static void nft_request_module(struct net *net, const char *fmt, ...)
510 char module_name[MODULE_NAME_LEN];
511 LIST_HEAD(commit_list);
515 list_splice_init(&net->nft.commit_list, &commit_list);
518 ret = vsnprintf(module_name, MODULE_NAME_LEN, fmt, args);
520 if (ret >= MODULE_NAME_LEN)
523 mutex_unlock(&net->nft.commit_mutex);
524 request_module("%s", module_name);
525 mutex_lock(&net->nft.commit_mutex);
527 WARN_ON_ONCE(!list_empty(&net->nft.commit_list));
528 list_splice(&commit_list, &net->nft.commit_list);
532 static void lockdep_nfnl_nft_mutex_not_held(void)
534 #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,
722 goto err_fill_table_info;
724 return nfnetlink_unicast(skb2, net, 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 int nf_tables_newtable(struct net *net, struct sock *nlsk,
845 struct sk_buff *skb, const struct nlmsghdr *nlh,
846 const struct nlattr * const nla[],
847 struct netlink_ext_ack *extack)
849 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
850 u8 genmask = nft_genmask_next(net);
851 int family = nfmsg->nfgen_family;
852 const struct nlattr *attr;
853 struct nft_table *table;
858 lockdep_assert_held(&net->nft.commit_mutex);
859 attr = nla[NFTA_TABLE_NAME];
860 table = nft_table_lookup(net, attr, family, genmask);
862 if (PTR_ERR(table) != -ENOENT)
863 return PTR_ERR(table);
865 if (nlh->nlmsg_flags & NLM_F_EXCL) {
866 NL_SET_BAD_ATTR(extack, attr);
869 if (nlh->nlmsg_flags & NLM_F_REPLACE)
872 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
873 return nf_tables_updtable(&ctx);
876 if (nla[NFTA_TABLE_FLAGS]) {
877 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
878 if (flags & ~NFT_TABLE_F_DORMANT)
883 table = kzalloc(sizeof(*table), GFP_KERNEL);
887 table->name = nla_strdup(attr, GFP_KERNEL);
888 if (table->name == NULL)
891 err = rhltable_init(&table->chains_ht, &nft_chain_ht_params);
895 INIT_LIST_HEAD(&table->chains);
896 INIT_LIST_HEAD(&table->sets);
897 INIT_LIST_HEAD(&table->objects);
898 INIT_LIST_HEAD(&table->flowtables);
899 table->family = family;
900 table->flags = flags;
901 table->handle = ++table_handle;
903 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
904 err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
908 list_add_tail_rcu(&table->list, &net->nft.tables);
911 rhltable_destroy(&table->chains_ht);
920 static int nft_flush_table(struct nft_ctx *ctx)
922 struct nft_flowtable *flowtable, *nft;
923 struct nft_chain *chain, *nc;
924 struct nft_object *obj, *ne;
925 struct nft_set *set, *ns;
928 list_for_each_entry(chain, &ctx->table->chains, list) {
929 if (!nft_is_active_next(ctx->net, chain))
934 err = nft_delrule_by_chain(ctx);
939 list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
940 if (!nft_is_active_next(ctx->net, set))
943 if (nft_set_is_anonymous(set) &&
944 !list_empty(&set->bindings))
947 err = nft_delset(ctx, set);
952 list_for_each_entry_safe(flowtable, nft, &ctx->table->flowtables, list) {
953 if (!nft_is_active_next(ctx->net, flowtable))
956 err = nft_delflowtable(ctx, flowtable);
961 list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) {
962 if (!nft_is_active_next(ctx->net, obj))
965 err = nft_delobj(ctx, obj);
970 list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
971 if (!nft_is_active_next(ctx->net, chain))
976 err = nft_delchain(ctx);
981 err = nft_deltable(ctx);
986 static int nft_flush(struct nft_ctx *ctx, int family)
988 struct nft_table *table, *nt;
989 const struct nlattr * const *nla = ctx->nla;
992 list_for_each_entry_safe(table, nt, &ctx->net->nft.tables, list) {
993 if (family != AF_UNSPEC && table->family != family)
996 ctx->family = table->family;
998 if (!nft_is_active_next(ctx->net, table))
1001 if (nla[NFTA_TABLE_NAME] &&
1002 nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
1007 err = nft_flush_table(ctx);
1015 static int nf_tables_deltable(struct net *net, struct sock *nlsk,
1016 struct sk_buff *skb, const struct nlmsghdr *nlh,
1017 const struct nlattr * const nla[],
1018 struct netlink_ext_ack *extack)
1020 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1021 u8 genmask = nft_genmask_next(net);
1022 int family = nfmsg->nfgen_family;
1023 const struct nlattr *attr;
1024 struct nft_table *table;
1027 nft_ctx_init(&ctx, net, skb, nlh, 0, NULL, NULL, nla);
1028 if (family == AF_UNSPEC ||
1029 (!nla[NFTA_TABLE_NAME] && !nla[NFTA_TABLE_HANDLE]))
1030 return nft_flush(&ctx, family);
1032 if (nla[NFTA_TABLE_HANDLE]) {
1033 attr = nla[NFTA_TABLE_HANDLE];
1034 table = nft_table_lookup_byhandle(net, attr, genmask);
1036 attr = nla[NFTA_TABLE_NAME];
1037 table = nft_table_lookup(net, attr, family, genmask);
1040 if (IS_ERR(table)) {
1041 NL_SET_BAD_ATTR(extack, attr);
1042 return PTR_ERR(table);
1045 if (nlh->nlmsg_flags & NLM_F_NONREC &&
1049 ctx.family = family;
1052 return nft_flush_table(&ctx);
1055 static void nf_tables_table_destroy(struct nft_ctx *ctx)
1057 if (WARN_ON(ctx->table->use > 0))
1060 rhltable_destroy(&ctx->table->chains_ht);
1061 kfree(ctx->table->name);
1065 void nft_register_chain_type(const struct nft_chain_type *ctype)
1067 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1068 if (WARN_ON(__nft_chain_type_get(ctype->family, ctype->type))) {
1069 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1072 chain_type[ctype->family][ctype->type] = ctype;
1073 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1075 EXPORT_SYMBOL_GPL(nft_register_chain_type);
1077 void nft_unregister_chain_type(const struct nft_chain_type *ctype)
1079 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1080 chain_type[ctype->family][ctype->type] = NULL;
1081 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1083 EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
1089 static struct nft_chain *
1090 nft_chain_lookup_byhandle(const struct nft_table *table, u64 handle, u8 genmask)
1092 struct nft_chain *chain;
1094 list_for_each_entry(chain, &table->chains, list) {
1095 if (chain->handle == handle &&
1096 nft_active_genmask(chain, genmask))
1100 return ERR_PTR(-ENOENT);
1103 static bool lockdep_commit_lock_is_held(struct net *net)
1105 #ifdef CONFIG_PROVE_LOCKING
1106 return lockdep_is_held(&net->nft.commit_mutex);
1112 static struct nft_chain *nft_chain_lookup(struct net *net,
1113 struct nft_table *table,
1114 const struct nlattr *nla, u8 genmask)
1116 char search[NFT_CHAIN_MAXNAMELEN + 1];
1117 struct rhlist_head *tmp, *list;
1118 struct nft_chain *chain;
1121 return ERR_PTR(-EINVAL);
1123 nla_strlcpy(search, nla, sizeof(search));
1125 WARN_ON(!rcu_read_lock_held() &&
1126 !lockdep_commit_lock_is_held(net));
1128 chain = ERR_PTR(-ENOENT);
1130 list = rhltable_lookup(&table->chains_ht, search, nft_chain_ht_params);
1134 rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
1135 if (nft_active_genmask(chain, genmask))
1138 chain = ERR_PTR(-ENOENT);
1144 static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
1145 [NFTA_CHAIN_TABLE] = { .type = NLA_STRING,
1146 .len = NFT_TABLE_MAXNAMELEN - 1 },
1147 [NFTA_CHAIN_HANDLE] = { .type = NLA_U64 },
1148 [NFTA_CHAIN_NAME] = { .type = NLA_STRING,
1149 .len = NFT_CHAIN_MAXNAMELEN - 1 },
1150 [NFTA_CHAIN_HOOK] = { .type = NLA_NESTED },
1151 [NFTA_CHAIN_POLICY] = { .type = NLA_U32 },
1152 [NFTA_CHAIN_TYPE] = { .type = NLA_STRING,
1153 .len = NFT_MODULE_AUTOLOAD_LIMIT },
1154 [NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED },
1157 static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
1158 [NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 },
1159 [NFTA_HOOK_PRIORITY] = { .type = NLA_U32 },
1160 [NFTA_HOOK_DEV] = { .type = NLA_STRING,
1161 .len = IFNAMSIZ - 1 },
1164 static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
1166 struct nft_stats *cpu_stats, total;
1167 struct nlattr *nest;
1175 memset(&total, 0, sizeof(total));
1176 for_each_possible_cpu(cpu) {
1177 cpu_stats = per_cpu_ptr(stats, cpu);
1179 seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
1180 pkts = cpu_stats->pkts;
1181 bytes = cpu_stats->bytes;
1182 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq));
1184 total.bytes += bytes;
1186 nest = nla_nest_start(skb, NFTA_CHAIN_COUNTERS);
1188 goto nla_put_failure;
1190 if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts),
1191 NFTA_COUNTER_PAD) ||
1192 nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
1194 goto nla_put_failure;
1196 nla_nest_end(skb, nest);
1203 static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
1204 u32 portid, u32 seq, int event, u32 flags,
1205 int family, const struct nft_table *table,
1206 const struct nft_chain *chain)
1208 struct nlmsghdr *nlh;
1209 struct nfgenmsg *nfmsg;
1211 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
1212 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
1214 goto nla_put_failure;
1216 nfmsg = nlmsg_data(nlh);
1217 nfmsg->nfgen_family = family;
1218 nfmsg->version = NFNETLINK_V0;
1219 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
1221 if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name))
1222 goto nla_put_failure;
1223 if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle),
1225 goto nla_put_failure;
1226 if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name))
1227 goto nla_put_failure;
1229 if (nft_is_base_chain(chain)) {
1230 const struct nft_base_chain *basechain = nft_base_chain(chain);
1231 const struct nf_hook_ops *ops = &basechain->ops;
1232 struct nft_stats __percpu *stats;
1233 struct nlattr *nest;
1235 nest = nla_nest_start(skb, NFTA_CHAIN_HOOK);
1237 goto nla_put_failure;
1238 if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
1239 goto nla_put_failure;
1240 if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
1241 goto nla_put_failure;
1242 if (basechain->dev_name[0] &&
1243 nla_put_string(skb, NFTA_HOOK_DEV, basechain->dev_name))
1244 goto nla_put_failure;
1245 nla_nest_end(skb, nest);
1247 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
1248 htonl(basechain->policy)))
1249 goto nla_put_failure;
1251 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
1252 goto nla_put_failure;
1254 stats = rcu_dereference_check(basechain->stats,
1255 lockdep_commit_lock_is_held(net));
1256 if (nft_dump_stats(skb, stats))
1257 goto nla_put_failure;
1260 if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
1261 goto nla_put_failure;
1263 nlmsg_end(skb, nlh);
1267 nlmsg_trim(skb, nlh);
1271 static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event)
1273 struct sk_buff *skb;
1277 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1280 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1284 err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
1285 event, 0, ctx->family, ctx->table,
1292 nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1293 ctx->report, GFP_KERNEL);
1296 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
1299 static int nf_tables_dump_chains(struct sk_buff *skb,
1300 struct netlink_callback *cb)
1302 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1303 const struct nft_table *table;
1304 const struct nft_chain *chain;
1305 unsigned int idx = 0, s_idx = cb->args[0];
1306 struct net *net = sock_net(skb->sk);
1307 int family = nfmsg->nfgen_family;
1310 cb->seq = net->nft.base_seq;
1312 list_for_each_entry_rcu(table, &net->nft.tables, list) {
1313 if (family != NFPROTO_UNSPEC && family != table->family)
1316 list_for_each_entry_rcu(chain, &table->chains, list) {
1320 memset(&cb->args[1], 0,
1321 sizeof(cb->args) - sizeof(cb->args[0]));
1322 if (!nft_is_active(net, chain))
1324 if (nf_tables_fill_chain_info(skb, net,
1325 NETLINK_CB(cb->skb).portid,
1329 table->family, table,
1333 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1344 /* called with rcu_read_lock held */
1345 static int nf_tables_getchain(struct net *net, struct sock *nlsk,
1346 struct sk_buff *skb, const struct nlmsghdr *nlh,
1347 const struct nlattr * const nla[],
1348 struct netlink_ext_ack *extack)
1350 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1351 u8 genmask = nft_genmask_cur(net);
1352 const struct nft_chain *chain;
1353 struct nft_table *table;
1354 struct sk_buff *skb2;
1355 int family = nfmsg->nfgen_family;
1358 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1359 struct netlink_dump_control c = {
1360 .dump = nf_tables_dump_chains,
1361 .module = THIS_MODULE,
1364 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
1367 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask);
1368 if (IS_ERR(table)) {
1369 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
1370 return PTR_ERR(table);
1373 chain = nft_chain_lookup(net, table, nla[NFTA_CHAIN_NAME], genmask);
1374 if (IS_ERR(chain)) {
1375 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
1376 return PTR_ERR(chain);
1379 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1383 err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
1384 nlh->nlmsg_seq, NFT_MSG_NEWCHAIN, 0,
1385 family, table, chain);
1387 goto err_fill_chain_info;
1389 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
1391 err_fill_chain_info:
1396 static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
1397 [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 },
1398 [NFTA_COUNTER_BYTES] = { .type = NLA_U64 },
1401 static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
1403 struct nlattr *tb[NFTA_COUNTER_MAX+1];
1404 struct nft_stats __percpu *newstats;
1405 struct nft_stats *stats;
1408 err = nla_parse_nested(tb, NFTA_COUNTER_MAX, attr, nft_counter_policy,
1411 return ERR_PTR(err);
1413 if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
1414 return ERR_PTR(-EINVAL);
1416 newstats = netdev_alloc_pcpu_stats(struct nft_stats);
1417 if (newstats == NULL)
1418 return ERR_PTR(-ENOMEM);
1420 /* Restore old counters on this cpu, no problem. Per-cpu statistics
1421 * are not exposed to userspace.
1424 stats = this_cpu_ptr(newstats);
1425 stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
1426 stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
1432 static void nft_chain_stats_replace(struct net *net,
1433 struct nft_base_chain *chain,
1434 struct nft_stats __percpu *newstats)
1436 struct nft_stats __percpu *oldstats;
1438 if (newstats == NULL)
1441 if (rcu_access_pointer(chain->stats)) {
1442 oldstats = rcu_dereference_protected(chain->stats,
1443 lockdep_commit_lock_is_held(net));
1444 rcu_assign_pointer(chain->stats, newstats);
1446 free_percpu(oldstats);
1448 rcu_assign_pointer(chain->stats, newstats);
1449 static_branch_inc(&nft_counters_enabled);
1453 static void nf_tables_chain_free_chain_rules(struct nft_chain *chain)
1455 struct nft_rule **g0 = rcu_dereference_raw(chain->rules_gen_0);
1456 struct nft_rule **g1 = rcu_dereference_raw(chain->rules_gen_1);
1462 /* should be NULL either via abort or via successful commit */
1463 WARN_ON_ONCE(chain->rules_next);
1464 kvfree(chain->rules_next);
1467 static void nf_tables_chain_destroy(struct nft_ctx *ctx)
1469 struct nft_chain *chain = ctx->chain;
1471 if (WARN_ON(chain->use > 0))
1474 /* no concurrent access possible anymore */
1475 nf_tables_chain_free_chain_rules(chain);
1477 if (nft_is_base_chain(chain)) {
1478 struct nft_base_chain *basechain = nft_base_chain(chain);
1480 module_put(basechain->type->owner);
1481 if (rcu_access_pointer(basechain->stats)) {
1482 static_branch_dec(&nft_counters_enabled);
1483 free_percpu(rcu_dereference_raw(basechain->stats));
1493 struct nft_chain_hook {
1496 const struct nft_chain_type *type;
1497 struct net_device *dev;
1500 static int nft_chain_parse_hook(struct net *net,
1501 const struct nlattr * const nla[],
1502 struct nft_chain_hook *hook, u8 family,
1505 struct nlattr *ha[NFTA_HOOK_MAX + 1];
1506 const struct nft_chain_type *type;
1507 struct net_device *dev;
1510 lockdep_assert_held(&net->nft.commit_mutex);
1511 lockdep_nfnl_nft_mutex_not_held();
1513 err = nla_parse_nested(ha, NFTA_HOOK_MAX, nla[NFTA_CHAIN_HOOK],
1514 nft_hook_policy, NULL);
1518 if (ha[NFTA_HOOK_HOOKNUM] == NULL ||
1519 ha[NFTA_HOOK_PRIORITY] == NULL)
1522 hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
1523 hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
1525 type = __nft_chain_type_get(family, NFT_CHAIN_T_DEFAULT);
1529 if (nla[NFTA_CHAIN_TYPE]) {
1530 type = nf_tables_chain_type_lookup(net, nla[NFTA_CHAIN_TYPE],
1533 return PTR_ERR(type);
1535 if (hook->num > NF_MAX_HOOKS || !(type->hook_mask & (1 << hook->num)))
1538 if (type->type == NFT_CHAIN_T_NAT &&
1539 hook->priority <= NF_IP_PRI_CONNTRACK)
1542 if (!try_module_get(type->owner))
1548 if (family == NFPROTO_NETDEV) {
1549 char ifname[IFNAMSIZ];
1551 if (!ha[NFTA_HOOK_DEV]) {
1552 module_put(type->owner);
1556 nla_strlcpy(ifname, ha[NFTA_HOOK_DEV], IFNAMSIZ);
1557 dev = __dev_get_by_name(net, ifname);
1559 module_put(type->owner);
1563 } else if (ha[NFTA_HOOK_DEV]) {
1564 module_put(type->owner);
1571 static void nft_chain_release_hook(struct nft_chain_hook *hook)
1573 module_put(hook->type->owner);
1576 struct nft_rules_old {
1578 struct nft_rule **start;
1581 static struct nft_rule **nf_tables_chain_alloc_rules(const struct nft_chain *chain,
1584 if (alloc > INT_MAX)
1587 alloc += 1; /* NULL, ends rules */
1588 if (sizeof(struct nft_rule *) > INT_MAX / alloc)
1591 alloc *= sizeof(struct nft_rule *);
1592 alloc += sizeof(struct nft_rules_old);
1594 return kvmalloc(alloc, GFP_KERNEL);
1597 static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask,
1600 const struct nlattr * const *nla = ctx->nla;
1601 struct nft_table *table = ctx->table;
1602 struct nft_base_chain *basechain;
1603 struct nft_stats __percpu *stats;
1604 struct net *net = ctx->net;
1605 struct nft_chain *chain;
1606 struct nft_rule **rules;
1609 if (table->use == UINT_MAX)
1612 if (nla[NFTA_CHAIN_HOOK]) {
1613 struct nft_chain_hook hook;
1614 struct nf_hook_ops *ops;
1616 err = nft_chain_parse_hook(net, nla, &hook, family, true);
1620 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL);
1621 if (basechain == NULL) {
1622 nft_chain_release_hook(&hook);
1626 if (hook.dev != NULL)
1627 strncpy(basechain->dev_name, hook.dev->name, IFNAMSIZ);
1629 if (nla[NFTA_CHAIN_COUNTERS]) {
1630 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1631 if (IS_ERR(stats)) {
1632 nft_chain_release_hook(&hook);
1634 return PTR_ERR(stats);
1636 rcu_assign_pointer(basechain->stats, stats);
1637 static_branch_inc(&nft_counters_enabled);
1640 basechain->type = hook.type;
1641 chain = &basechain->chain;
1643 ops = &basechain->ops;
1645 ops->hooknum = hook.num;
1646 ops->priority = hook.priority;
1648 ops->hook = hook.type->hooks[ops->hooknum];
1649 ops->dev = hook.dev;
1651 chain->flags |= NFT_BASE_CHAIN;
1652 basechain->policy = policy;
1654 chain = kzalloc(sizeof(*chain), GFP_KERNEL);
1660 INIT_LIST_HEAD(&chain->rules);
1661 chain->handle = nf_tables_alloc_handle(table);
1662 chain->table = table;
1663 chain->name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL);
1669 rules = nf_tables_chain_alloc_rules(chain, 0);
1676 rcu_assign_pointer(chain->rules_gen_0, rules);
1677 rcu_assign_pointer(chain->rules_gen_1, rules);
1679 err = nf_tables_register_hook(net, table, chain);
1683 err = rhltable_insert_key(&table->chains_ht, chain->name,
1684 &chain->rhlhead, nft_chain_ht_params);
1688 err = nft_trans_chain_add(ctx, NFT_MSG_NEWCHAIN);
1690 rhltable_remove(&table->chains_ht, &chain->rhlhead,
1691 nft_chain_ht_params);
1696 list_add_tail_rcu(&chain->list, &table->chains);
1700 nf_tables_unregister_hook(net, table, chain);
1702 nf_tables_chain_destroy(ctx);
1707 static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy)
1709 const struct nlattr * const *nla = ctx->nla;
1710 struct nft_table *table = ctx->table;
1711 struct nft_chain *chain = ctx->chain;
1712 struct nft_base_chain *basechain;
1713 struct nft_stats *stats = NULL;
1714 struct nft_chain_hook hook;
1715 struct nf_hook_ops *ops;
1716 struct nft_trans *trans;
1719 if (nla[NFTA_CHAIN_HOOK]) {
1720 if (!nft_is_base_chain(chain))
1723 err = nft_chain_parse_hook(ctx->net, nla, &hook, ctx->family,
1728 basechain = nft_base_chain(chain);
1729 if (basechain->type != hook.type) {
1730 nft_chain_release_hook(&hook);
1734 ops = &basechain->ops;
1735 if (ops->hooknum != hook.num ||
1736 ops->priority != hook.priority ||
1737 ops->dev != hook.dev) {
1738 nft_chain_release_hook(&hook);
1741 nft_chain_release_hook(&hook);
1744 if (nla[NFTA_CHAIN_HANDLE] &&
1745 nla[NFTA_CHAIN_NAME]) {
1746 struct nft_chain *chain2;
1748 chain2 = nft_chain_lookup(ctx->net, table,
1749 nla[NFTA_CHAIN_NAME], genmask);
1750 if (!IS_ERR(chain2))
1754 if (nla[NFTA_CHAIN_COUNTERS]) {
1755 if (!nft_is_base_chain(chain))
1758 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1760 return PTR_ERR(stats);
1764 trans = nft_trans_alloc(ctx, NFT_MSG_NEWCHAIN,
1765 sizeof(struct nft_trans_chain));
1769 nft_trans_chain_stats(trans) = stats;
1770 nft_trans_chain_update(trans) = true;
1772 if (nla[NFTA_CHAIN_POLICY])
1773 nft_trans_chain_policy(trans) = policy;
1775 nft_trans_chain_policy(trans) = -1;
1777 if (nla[NFTA_CHAIN_HANDLE] &&
1778 nla[NFTA_CHAIN_NAME]) {
1779 struct nft_trans *tmp;
1783 name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL);
1788 list_for_each_entry(tmp, &ctx->net->nft.commit_list, list) {
1789 if (tmp->msg_type == NFT_MSG_NEWCHAIN &&
1790 tmp->ctx.table == table &&
1791 nft_trans_chain_update(tmp) &&
1792 nft_trans_chain_name(tmp) &&
1793 strcmp(name, nft_trans_chain_name(tmp)) == 0) {
1799 nft_trans_chain_name(trans) = name;
1801 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
1810 static int nf_tables_newchain(struct net *net, struct sock *nlsk,
1811 struct sk_buff *skb, const struct nlmsghdr *nlh,
1812 const struct nlattr * const nla[],
1813 struct netlink_ext_ack *extack)
1815 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1816 u8 genmask = nft_genmask_next(net);
1817 int family = nfmsg->nfgen_family;
1818 const struct nlattr *attr;
1819 struct nft_table *table;
1820 struct nft_chain *chain;
1821 u8 policy = NF_ACCEPT;
1825 lockdep_assert_held(&net->nft.commit_mutex);
1827 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask);
1828 if (IS_ERR(table)) {
1829 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
1830 return PTR_ERR(table);
1834 attr = nla[NFTA_CHAIN_NAME];
1836 if (nla[NFTA_CHAIN_HANDLE]) {
1837 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
1838 chain = nft_chain_lookup_byhandle(table, handle, genmask);
1839 if (IS_ERR(chain)) {
1840 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_HANDLE]);
1841 return PTR_ERR(chain);
1843 attr = nla[NFTA_CHAIN_HANDLE];
1845 chain = nft_chain_lookup(net, table, attr, genmask);
1846 if (IS_ERR(chain)) {
1847 if (PTR_ERR(chain) != -ENOENT) {
1848 NL_SET_BAD_ATTR(extack, attr);
1849 return PTR_ERR(chain);
1855 if (nla[NFTA_CHAIN_POLICY]) {
1856 if (chain != NULL &&
1857 !nft_is_base_chain(chain)) {
1858 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
1862 if (chain == NULL &&
1863 nla[NFTA_CHAIN_HOOK] == NULL) {
1864 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
1868 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
1878 nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
1880 if (chain != NULL) {
1881 if (nlh->nlmsg_flags & NLM_F_EXCL) {
1882 NL_SET_BAD_ATTR(extack, attr);
1885 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1888 return nf_tables_updchain(&ctx, genmask, policy);
1891 return nf_tables_addchain(&ctx, family, genmask, policy);
1894 static int nf_tables_delchain(struct net *net, struct sock *nlsk,
1895 struct sk_buff *skb, const struct nlmsghdr *nlh,
1896 const struct nlattr * const nla[],
1897 struct netlink_ext_ack *extack)
1899 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1900 u8 genmask = nft_genmask_next(net);
1901 int family = nfmsg->nfgen_family;
1902 const struct nlattr *attr;
1903 struct nft_table *table;
1904 struct nft_chain *chain;
1905 struct nft_rule *rule;
1911 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask);
1912 if (IS_ERR(table)) {
1913 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
1914 return PTR_ERR(table);
1917 if (nla[NFTA_CHAIN_HANDLE]) {
1918 attr = nla[NFTA_CHAIN_HANDLE];
1919 handle = be64_to_cpu(nla_get_be64(attr));
1920 chain = nft_chain_lookup_byhandle(table, handle, genmask);
1922 attr = nla[NFTA_CHAIN_NAME];
1923 chain = nft_chain_lookup(net, table, attr, genmask);
1925 if (IS_ERR(chain)) {
1926 NL_SET_BAD_ATTR(extack, attr);
1927 return PTR_ERR(chain);
1930 if (nlh->nlmsg_flags & NLM_F_NONREC &&
1934 nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
1937 list_for_each_entry(rule, &chain->rules, list) {
1938 if (!nft_is_active_next(net, rule))
1942 err = nft_delrule(&ctx, rule);
1947 /* There are rules and elements that are still holding references to us,
1948 * we cannot do a recursive removal in this case.
1951 NL_SET_BAD_ATTR(extack, attr);
1955 return nft_delchain(&ctx);
1963 * nft_register_expr - register nf_tables expr type
1966 * Registers the expr type for use with nf_tables. Returns zero on
1967 * success or a negative errno code otherwise.
1969 int nft_register_expr(struct nft_expr_type *type)
1971 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1972 if (type->family == NFPROTO_UNSPEC)
1973 list_add_tail_rcu(&type->list, &nf_tables_expressions);
1975 list_add_rcu(&type->list, &nf_tables_expressions);
1976 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1979 EXPORT_SYMBOL_GPL(nft_register_expr);
1982 * nft_unregister_expr - unregister nf_tables expr type
1985 * Unregisters the expr typefor use with nf_tables.
1987 void nft_unregister_expr(struct nft_expr_type *type)
1989 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1990 list_del_rcu(&type->list);
1991 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1993 EXPORT_SYMBOL_GPL(nft_unregister_expr);
1995 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
1998 const struct nft_expr_type *type;
2000 list_for_each_entry(type, &nf_tables_expressions, list) {
2001 if (!nla_strcmp(nla, type->name) &&
2002 (!type->family || type->family == family))
2008 static const struct nft_expr_type *nft_expr_type_get(struct net *net,
2012 const struct nft_expr_type *type;
2015 return ERR_PTR(-EINVAL);
2017 type = __nft_expr_type_get(family, nla);
2018 if (type != NULL && try_module_get(type->owner))
2021 lockdep_nfnl_nft_mutex_not_held();
2022 #ifdef CONFIG_MODULES
2024 nft_request_module(net, "nft-expr-%u-%.*s", family,
2025 nla_len(nla), (char *)nla_data(nla));
2026 if (__nft_expr_type_get(family, nla))
2027 return ERR_PTR(-EAGAIN);
2029 nft_request_module(net, "nft-expr-%.*s",
2030 nla_len(nla), (char *)nla_data(nla));
2031 if (__nft_expr_type_get(family, nla))
2032 return ERR_PTR(-EAGAIN);
2035 return ERR_PTR(-ENOENT);
2038 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
2039 [NFTA_EXPR_NAME] = { .type = NLA_STRING,
2040 .len = NFT_MODULE_AUTOLOAD_LIMIT },
2041 [NFTA_EXPR_DATA] = { .type = NLA_NESTED },
2044 static int nf_tables_fill_expr_info(struct sk_buff *skb,
2045 const struct nft_expr *expr)
2047 if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
2048 goto nla_put_failure;
2050 if (expr->ops->dump) {
2051 struct nlattr *data = nla_nest_start(skb, NFTA_EXPR_DATA);
2053 goto nla_put_failure;
2054 if (expr->ops->dump(skb, expr) < 0)
2055 goto nla_put_failure;
2056 nla_nest_end(skb, data);
2065 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
2066 const struct nft_expr *expr)
2068 struct nlattr *nest;
2070 nest = nla_nest_start(skb, attr);
2072 goto nla_put_failure;
2073 if (nf_tables_fill_expr_info(skb, expr) < 0)
2074 goto nla_put_failure;
2075 nla_nest_end(skb, nest);
2082 struct nft_expr_info {
2083 const struct nft_expr_ops *ops;
2084 struct nlattr *tb[NFT_EXPR_MAXATTR + 1];
2087 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
2088 const struct nlattr *nla,
2089 struct nft_expr_info *info)
2091 const struct nft_expr_type *type;
2092 const struct nft_expr_ops *ops;
2093 struct nlattr *tb[NFTA_EXPR_MAX + 1];
2096 err = nla_parse_nested(tb, NFTA_EXPR_MAX, nla, nft_expr_policy, NULL);
2100 type = nft_expr_type_get(ctx->net, ctx->family, tb[NFTA_EXPR_NAME]);
2102 return PTR_ERR(type);
2104 if (tb[NFTA_EXPR_DATA]) {
2105 err = nla_parse_nested(info->tb, type->maxattr,
2106 tb[NFTA_EXPR_DATA], type->policy, NULL);
2110 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
2112 if (type->select_ops != NULL) {
2113 ops = type->select_ops(ctx,
2114 (const struct nlattr * const *)info->tb);
2126 module_put(type->owner);
2130 static int nf_tables_newexpr(const struct nft_ctx *ctx,
2131 const struct nft_expr_info *info,
2132 struct nft_expr *expr)
2134 const struct nft_expr_ops *ops = info->ops;
2139 err = ops->init(ctx, expr, (const struct nlattr **)info->tb);
2150 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
2151 struct nft_expr *expr)
2153 const struct nft_expr_type *type = expr->ops->type;
2155 if (expr->ops->destroy)
2156 expr->ops->destroy(ctx, expr);
2157 module_put(type->owner);
2160 struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
2161 const struct nlattr *nla)
2163 struct nft_expr_info info;
2164 struct nft_expr *expr;
2165 struct module *owner;
2168 err = nf_tables_expr_parse(ctx, nla, &info);
2173 expr = kzalloc(info.ops->size, GFP_KERNEL);
2177 err = nf_tables_newexpr(ctx, &info, expr);
2185 owner = info.ops->type->owner;
2186 if (info.ops->type->release_ops)
2187 info.ops->type->release_ops(info.ops);
2191 return ERR_PTR(err);
2194 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
2196 nf_tables_expr_destroy(ctx, expr);
2204 static struct nft_rule *__nft_rule_lookup(const struct nft_chain *chain,
2207 struct nft_rule *rule;
2209 // FIXME: this sucks
2210 list_for_each_entry_rcu(rule, &chain->rules, list) {
2211 if (handle == rule->handle)
2215 return ERR_PTR(-ENOENT);
2218 static struct nft_rule *nft_rule_lookup(const struct nft_chain *chain,
2219 const struct nlattr *nla)
2222 return ERR_PTR(-EINVAL);
2224 return __nft_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
2227 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
2228 [NFTA_RULE_TABLE] = { .type = NLA_STRING,
2229 .len = NFT_TABLE_MAXNAMELEN - 1 },
2230 [NFTA_RULE_CHAIN] = { .type = NLA_STRING,
2231 .len = NFT_CHAIN_MAXNAMELEN - 1 },
2232 [NFTA_RULE_HANDLE] = { .type = NLA_U64 },
2233 [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
2234 [NFTA_RULE_COMPAT] = { .type = NLA_NESTED },
2235 [NFTA_RULE_POSITION] = { .type = NLA_U64 },
2236 [NFTA_RULE_USERDATA] = { .type = NLA_BINARY,
2237 .len = NFT_USERDATA_MAXLEN },
2238 [NFTA_RULE_ID] = { .type = NLA_U32 },
2241 static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
2242 u32 portid, u32 seq, int event,
2243 u32 flags, int family,
2244 const struct nft_table *table,
2245 const struct nft_chain *chain,
2246 const struct nft_rule *rule)
2248 struct nlmsghdr *nlh;
2249 struct nfgenmsg *nfmsg;
2250 const struct nft_expr *expr, *next;
2251 struct nlattr *list;
2252 const struct nft_rule *prule;
2253 u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
2255 nlh = nlmsg_put(skb, portid, seq, type, sizeof(struct nfgenmsg), flags);
2257 goto nla_put_failure;
2259 nfmsg = nlmsg_data(nlh);
2260 nfmsg->nfgen_family = family;
2261 nfmsg->version = NFNETLINK_V0;
2262 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
2264 if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
2265 goto nla_put_failure;
2266 if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
2267 goto nla_put_failure;
2268 if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
2270 goto nla_put_failure;
2272 if ((event != NFT_MSG_DELRULE) && (rule->list.prev != &chain->rules)) {
2273 prule = list_prev_entry(rule, list);
2274 if (nla_put_be64(skb, NFTA_RULE_POSITION,
2275 cpu_to_be64(prule->handle),
2277 goto nla_put_failure;
2280 list = nla_nest_start(skb, NFTA_RULE_EXPRESSIONS);
2282 goto nla_put_failure;
2283 nft_rule_for_each_expr(expr, next, rule) {
2284 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
2285 goto nla_put_failure;
2287 nla_nest_end(skb, list);
2290 struct nft_userdata *udata = nft_userdata(rule);
2291 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
2293 goto nla_put_failure;
2296 nlmsg_end(skb, nlh);
2300 nlmsg_trim(skb, nlh);
2304 static void nf_tables_rule_notify(const struct nft_ctx *ctx,
2305 const struct nft_rule *rule, int event)
2307 struct sk_buff *skb;
2311 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
2314 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
2318 err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
2319 event, 0, ctx->family, ctx->table,
2326 nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
2327 ctx->report, GFP_KERNEL);
2330 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
2333 struct nft_rule_dump_ctx {
2338 static int nf_tables_dump_rules(struct sk_buff *skb,
2339 struct netlink_callback *cb)
2341 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
2342 const struct nft_rule_dump_ctx *ctx = cb->data;
2343 const struct nft_table *table;
2344 const struct nft_chain *chain;
2345 const struct nft_rule *rule;
2346 unsigned int idx = 0, s_idx = cb->args[0];
2347 struct net *net = sock_net(skb->sk);
2348 int family = nfmsg->nfgen_family;
2351 cb->seq = net->nft.base_seq;
2353 list_for_each_entry_rcu(table, &net->nft.tables, list) {
2354 if (family != NFPROTO_UNSPEC && family != table->family)
2357 if (ctx && ctx->table && strcmp(ctx->table, table->name) != 0)
2360 list_for_each_entry_rcu(chain, &table->chains, list) {
2361 if (ctx && ctx->chain &&
2362 strcmp(ctx->chain, chain->name) != 0)
2365 list_for_each_entry_rcu(rule, &chain->rules, list) {
2366 if (!nft_is_active(net, rule))
2371 memset(&cb->args[1], 0,
2372 sizeof(cb->args) - sizeof(cb->args[0]));
2373 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
2376 NLM_F_MULTI | NLM_F_APPEND,
2378 table, chain, rule) < 0)
2381 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
2394 static int nf_tables_dump_rules_start(struct netlink_callback *cb)
2396 const struct nlattr * const *nla = cb->data;
2397 struct nft_rule_dump_ctx *ctx = NULL;
2399 if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) {
2400 ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
2404 if (nla[NFTA_RULE_TABLE]) {
2405 ctx->table = nla_strdup(nla[NFTA_RULE_TABLE],
2412 if (nla[NFTA_RULE_CHAIN]) {
2413 ctx->chain = nla_strdup(nla[NFTA_RULE_CHAIN],
2427 static int nf_tables_dump_rules_done(struct netlink_callback *cb)
2429 struct nft_rule_dump_ctx *ctx = cb->data;
2439 /* called with rcu_read_lock held */
2440 static int nf_tables_getrule(struct net *net, struct sock *nlsk,
2441 struct sk_buff *skb, const struct nlmsghdr *nlh,
2442 const struct nlattr * const nla[],
2443 struct netlink_ext_ack *extack)
2445 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2446 u8 genmask = nft_genmask_cur(net);
2447 const struct nft_chain *chain;
2448 const struct nft_rule *rule;
2449 struct nft_table *table;
2450 struct sk_buff *skb2;
2451 int family = nfmsg->nfgen_family;
2454 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2455 struct netlink_dump_control c = {
2456 .start= nf_tables_dump_rules_start,
2457 .dump = nf_tables_dump_rules,
2458 .done = nf_tables_dump_rules_done,
2459 .module = THIS_MODULE,
2460 .data = (void *)nla,
2463 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
2466 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask);
2467 if (IS_ERR(table)) {
2468 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
2469 return PTR_ERR(table);
2472 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask);
2473 if (IS_ERR(chain)) {
2474 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
2475 return PTR_ERR(chain);
2478 rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
2480 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
2481 return PTR_ERR(rule);
2484 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
2488 err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
2489 nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
2490 family, table, chain, rule);
2492 goto err_fill_rule_info;
2494 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
2501 static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
2502 struct nft_rule *rule)
2504 struct nft_expr *expr, *next;
2506 lockdep_assert_held(&ctx->net->nft.commit_mutex);
2508 * Careful: some expressions might not be initialized in case this
2509 * is called on error from nf_tables_newrule().
2511 expr = nft_expr_first(rule);
2512 while (expr != nft_expr_last(rule) && expr->ops) {
2513 next = nft_expr_next(expr);
2514 nf_tables_expr_destroy(ctx, expr);
2520 static void nf_tables_rule_release(const struct nft_ctx *ctx,
2521 struct nft_rule *rule)
2523 nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_RELEASE);
2524 nf_tables_rule_destroy(ctx, rule);
2527 int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain)
2529 struct nft_expr *expr, *last;
2530 const struct nft_data *data;
2531 struct nft_rule *rule;
2534 if (ctx->level == NFT_JUMP_STACK_SIZE)
2537 list_for_each_entry(rule, &chain->rules, list) {
2538 if (!nft_is_active_next(ctx->net, rule))
2541 nft_rule_for_each_expr(expr, last, rule) {
2542 if (!expr->ops->validate)
2545 err = expr->ops->validate(ctx, expr, &data);
2553 EXPORT_SYMBOL_GPL(nft_chain_validate);
2555 static int nft_table_validate(struct net *net, const struct nft_table *table)
2557 struct nft_chain *chain;
2558 struct nft_ctx ctx = {
2560 .family = table->family,
2564 list_for_each_entry(chain, &table->chains, list) {
2565 if (!nft_is_base_chain(chain))
2569 err = nft_chain_validate(&ctx, chain);
2577 #define NFT_RULE_MAXEXPRS 128
2579 static int nf_tables_newrule(struct net *net, struct sock *nlsk,
2580 struct sk_buff *skb, const struct nlmsghdr *nlh,
2581 const struct nlattr * const nla[],
2582 struct netlink_ext_ack *extack)
2584 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2585 u8 genmask = nft_genmask_next(net);
2586 struct nft_expr_info *info = NULL;
2587 int family = nfmsg->nfgen_family;
2588 struct nft_table *table;
2589 struct nft_chain *chain;
2590 struct nft_rule *rule, *old_rule = NULL;
2591 struct nft_userdata *udata;
2592 struct nft_trans *trans = NULL;
2593 struct nft_expr *expr;
2596 unsigned int size, i, n, ulen = 0, usize = 0;
2598 u64 handle, pos_handle;
2600 lockdep_assert_held(&net->nft.commit_mutex);
2602 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask);
2603 if (IS_ERR(table)) {
2604 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
2605 return PTR_ERR(table);
2608 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask);
2609 if (IS_ERR(chain)) {
2610 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
2611 return PTR_ERR(chain);
2614 if (nla[NFTA_RULE_HANDLE]) {
2615 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
2616 rule = __nft_rule_lookup(chain, handle);
2618 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
2619 return PTR_ERR(rule);
2622 if (nlh->nlmsg_flags & NLM_F_EXCL) {
2623 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
2626 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2631 if (!(nlh->nlmsg_flags & NLM_F_CREATE) ||
2632 nlh->nlmsg_flags & NLM_F_REPLACE)
2634 handle = nf_tables_alloc_handle(table);
2636 if (chain->use == UINT_MAX)
2639 if (nla[NFTA_RULE_POSITION]) {
2640 pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
2641 old_rule = __nft_rule_lookup(chain, pos_handle);
2642 if (IS_ERR(old_rule)) {
2643 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION]);
2644 return PTR_ERR(old_rule);
2649 nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
2653 if (nla[NFTA_RULE_EXPRESSIONS]) {
2654 info = kvmalloc_array(NFT_RULE_MAXEXPRS,
2655 sizeof(struct nft_expr_info),
2660 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
2662 if (nla_type(tmp) != NFTA_LIST_ELEM)
2664 if (n == NFT_RULE_MAXEXPRS)
2666 err = nf_tables_expr_parse(&ctx, tmp, &info[n]);
2669 size += info[n].ops->size;
2673 /* Check for overflow of dlen field */
2675 if (size >= 1 << 12)
2678 if (nla[NFTA_RULE_USERDATA]) {
2679 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
2681 usize = sizeof(struct nft_userdata) + ulen;
2685 rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL);
2689 nft_activate_next(net, rule);
2691 rule->handle = handle;
2693 rule->udata = ulen ? 1 : 0;
2696 udata = nft_userdata(rule);
2697 udata->len = ulen - 1;
2698 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
2701 expr = nft_expr_first(rule);
2702 for (i = 0; i < n; i++) {
2703 err = nf_tables_newexpr(&ctx, &info[i], expr);
2707 if (info[i].ops->validate)
2708 nft_validate_state_update(net, NFT_VALIDATE_NEED);
2711 expr = nft_expr_next(expr);
2714 if (nlh->nlmsg_flags & NLM_F_REPLACE) {
2715 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
2716 if (trans == NULL) {
2720 err = nft_delrule(&ctx, old_rule);
2722 nft_trans_destroy(trans);
2726 list_add_tail_rcu(&rule->list, &old_rule->list);
2728 if (nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule) == NULL) {
2733 if (nlh->nlmsg_flags & NLM_F_APPEND) {
2735 list_add_rcu(&rule->list, &old_rule->list);
2737 list_add_tail_rcu(&rule->list, &chain->rules);
2740 list_add_tail_rcu(&rule->list, &old_rule->list);
2742 list_add_rcu(&rule->list, &chain->rules);
2748 if (net->nft.validate_state == NFT_VALIDATE_DO)
2749 return nft_table_validate(net, table);
2753 nf_tables_rule_release(&ctx, rule);
2755 for (i = 0; i < n; i++) {
2757 module_put(info[i].ops->type->owner);
2758 if (info[i].ops->type->release_ops)
2759 info[i].ops->type->release_ops(info[i].ops);
2766 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
2767 const struct nlattr *nla)
2769 u32 id = ntohl(nla_get_be32(nla));
2770 struct nft_trans *trans;
2772 list_for_each_entry(trans, &net->nft.commit_list, list) {
2773 struct nft_rule *rule = nft_trans_rule(trans);
2775 if (trans->msg_type == NFT_MSG_NEWRULE &&
2776 id == nft_trans_rule_id(trans))
2779 return ERR_PTR(-ENOENT);
2782 static int nf_tables_delrule(struct net *net, struct sock *nlsk,
2783 struct sk_buff *skb, const struct nlmsghdr *nlh,
2784 const struct nlattr * const nla[],
2785 struct netlink_ext_ack *extack)
2787 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2788 u8 genmask = nft_genmask_next(net);
2789 struct nft_table *table;
2790 struct nft_chain *chain = NULL;
2791 struct nft_rule *rule;
2792 int family = nfmsg->nfgen_family, err = 0;
2795 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask);
2796 if (IS_ERR(table)) {
2797 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
2798 return PTR_ERR(table);
2801 if (nla[NFTA_RULE_CHAIN]) {
2802 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
2804 if (IS_ERR(chain)) {
2805 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
2806 return PTR_ERR(chain);
2810 nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
2813 if (nla[NFTA_RULE_HANDLE]) {
2814 rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
2816 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
2817 return PTR_ERR(rule);
2820 err = nft_delrule(&ctx, rule);
2821 } else if (nla[NFTA_RULE_ID]) {
2822 rule = nft_rule_lookup_byid(net, nla[NFTA_RULE_ID]);
2824 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_ID]);
2825 return PTR_ERR(rule);
2828 err = nft_delrule(&ctx, rule);
2830 err = nft_delrule_by_chain(&ctx);
2833 list_for_each_entry(chain, &table->chains, list) {
2834 if (!nft_is_active_next(net, chain))
2838 err = nft_delrule_by_chain(&ctx);
2851 static LIST_HEAD(nf_tables_set_types);
2853 int nft_register_set(struct nft_set_type *type)
2855 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2856 list_add_tail_rcu(&type->list, &nf_tables_set_types);
2857 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2860 EXPORT_SYMBOL_GPL(nft_register_set);
2862 void nft_unregister_set(struct nft_set_type *type)
2864 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2865 list_del_rcu(&type->list);
2866 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2868 EXPORT_SYMBOL_GPL(nft_unregister_set);
2870 #define NFT_SET_FEATURES (NFT_SET_INTERVAL | NFT_SET_MAP | \
2871 NFT_SET_TIMEOUT | NFT_SET_OBJECT | \
2874 static bool nft_set_ops_candidate(const struct nft_set_type *type, u32 flags)
2876 return (flags & type->features) == (flags & NFT_SET_FEATURES);
2880 * Select a set implementation based on the data characteristics and the
2881 * given policy. The total memory use might not be known if no size is
2882 * given, in that case the amount of memory per element is used.
2884 static const struct nft_set_ops *
2885 nft_select_set_ops(const struct nft_ctx *ctx,
2886 const struct nlattr * const nla[],
2887 const struct nft_set_desc *desc,
2888 enum nft_set_policies policy)
2890 const struct nft_set_ops *ops, *bops;
2891 struct nft_set_estimate est, best;
2892 const struct nft_set_type *type;
2895 lockdep_assert_held(&ctx->net->nft.commit_mutex);
2896 lockdep_nfnl_nft_mutex_not_held();
2897 #ifdef CONFIG_MODULES
2898 if (list_empty(&nf_tables_set_types)) {
2899 nft_request_module(ctx->net, "nft-set");
2900 if (!list_empty(&nf_tables_set_types))
2901 return ERR_PTR(-EAGAIN);
2904 if (nla[NFTA_SET_FLAGS] != NULL)
2905 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
2912 list_for_each_entry(type, &nf_tables_set_types, list) {
2915 if (!nft_set_ops_candidate(type, flags))
2917 if (!ops->estimate(desc, flags, &est))
2921 case NFT_SET_POL_PERFORMANCE:
2922 if (est.lookup < best.lookup)
2924 if (est.lookup == best.lookup &&
2925 est.space < best.space)
2928 case NFT_SET_POL_MEMORY:
2930 if (est.space < best.space)
2932 if (est.space == best.space &&
2933 est.lookup < best.lookup)
2935 } else if (est.size < best.size || !bops) {
2943 if (!try_module_get(type->owner))
2946 module_put(to_set_type(bops)->owner);
2955 return ERR_PTR(-EOPNOTSUPP);
2958 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
2959 [NFTA_SET_TABLE] = { .type = NLA_STRING,
2960 .len = NFT_TABLE_MAXNAMELEN - 1 },
2961 [NFTA_SET_NAME] = { .type = NLA_STRING,
2962 .len = NFT_SET_MAXNAMELEN - 1 },
2963 [NFTA_SET_FLAGS] = { .type = NLA_U32 },
2964 [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 },
2965 [NFTA_SET_KEY_LEN] = { .type = NLA_U32 },
2966 [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 },
2967 [NFTA_SET_DATA_LEN] = { .type = NLA_U32 },
2968 [NFTA_SET_POLICY] = { .type = NLA_U32 },
2969 [NFTA_SET_DESC] = { .type = NLA_NESTED },
2970 [NFTA_SET_ID] = { .type = NLA_U32 },
2971 [NFTA_SET_TIMEOUT] = { .type = NLA_U64 },
2972 [NFTA_SET_GC_INTERVAL] = { .type = NLA_U32 },
2973 [NFTA_SET_USERDATA] = { .type = NLA_BINARY,
2974 .len = NFT_USERDATA_MAXLEN },
2975 [NFTA_SET_OBJ_TYPE] = { .type = NLA_U32 },
2976 [NFTA_SET_HANDLE] = { .type = NLA_U64 },
2979 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
2980 [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 },
2983 static int nft_ctx_init_from_setattr(struct nft_ctx *ctx, struct net *net,
2984 const struct sk_buff *skb,
2985 const struct nlmsghdr *nlh,
2986 const struct nlattr * const nla[],
2987 struct netlink_ext_ack *extack,
2990 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2991 int family = nfmsg->nfgen_family;
2992 struct nft_table *table = NULL;
2994 if (nla[NFTA_SET_TABLE] != NULL) {
2995 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
2997 if (IS_ERR(table)) {
2998 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
2999 return PTR_ERR(table);
3003 nft_ctx_init(ctx, net, skb, nlh, family, table, NULL, nla);
3007 static struct nft_set *nft_set_lookup(const struct nft_table *table,
3008 const struct nlattr *nla, u8 genmask)
3010 struct nft_set *set;
3013 return ERR_PTR(-EINVAL);
3015 list_for_each_entry_rcu(set, &table->sets, list) {
3016 if (!nla_strcmp(nla, set->name) &&
3017 nft_active_genmask(set, genmask))
3020 return ERR_PTR(-ENOENT);
3023 static struct nft_set *nft_set_lookup_byhandle(const struct nft_table *table,
3024 const struct nlattr *nla,
3027 struct nft_set *set;
3029 list_for_each_entry(set, &table->sets, list) {
3030 if (be64_to_cpu(nla_get_be64(nla)) == set->handle &&
3031 nft_active_genmask(set, genmask))
3034 return ERR_PTR(-ENOENT);
3037 static struct nft_set *nft_set_lookup_byid(const struct net *net,
3038 const struct nlattr *nla, u8 genmask)
3040 struct nft_trans *trans;
3041 u32 id = ntohl(nla_get_be32(nla));
3043 list_for_each_entry(trans, &net->nft.commit_list, list) {
3044 if (trans->msg_type == NFT_MSG_NEWSET) {
3045 struct nft_set *set = nft_trans_set(trans);
3047 if (id == nft_trans_set_id(trans) &&
3048 nft_active_genmask(set, genmask))
3052 return ERR_PTR(-ENOENT);
3055 struct nft_set *nft_set_lookup_global(const struct net *net,
3056 const struct nft_table *table,
3057 const struct nlattr *nla_set_name,
3058 const struct nlattr *nla_set_id,
3061 struct nft_set *set;
3063 set = nft_set_lookup(table, nla_set_name, genmask);
3068 set = nft_set_lookup_byid(net, nla_set_id, genmask);
3072 EXPORT_SYMBOL_GPL(nft_set_lookup_global);
3074 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
3077 const struct nft_set *i;
3079 unsigned long *inuse;
3080 unsigned int n = 0, min = 0;
3082 p = strchr(name, '%');
3084 if (p[1] != 'd' || strchr(p + 2, '%'))
3087 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
3091 list_for_each_entry(i, &ctx->table->sets, list) {
3094 if (!nft_is_active_next(ctx->net, set))
3096 if (!sscanf(i->name, name, &tmp))
3098 if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
3101 set_bit(tmp - min, inuse);
3104 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
3105 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
3106 min += BITS_PER_BYTE * PAGE_SIZE;
3107 memset(inuse, 0, PAGE_SIZE);
3110 free_page((unsigned long)inuse);
3113 set->name = kasprintf(GFP_KERNEL, name, min + n);
3117 list_for_each_entry(i, &ctx->table->sets, list) {
3118 if (!nft_is_active_next(ctx->net, i))
3120 if (!strcmp(set->name, i->name)) {
3128 static int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result)
3130 u64 ms = be64_to_cpu(nla_get_be64(nla));
3131 u64 max = (u64)(~((u64)0));
3133 max = div_u64(max, NSEC_PER_MSEC);
3137 ms *= NSEC_PER_MSEC;
3138 *result = nsecs_to_jiffies64(ms);
3142 static __be64 nf_jiffies64_to_msecs(u64 input)
3144 u64 ms = jiffies64_to_nsecs(input);
3146 return cpu_to_be64(div_u64(ms, NSEC_PER_MSEC));
3149 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
3150 const struct nft_set *set, u16 event, u16 flags)
3152 struct nfgenmsg *nfmsg;
3153 struct nlmsghdr *nlh;
3154 struct nlattr *desc;
3155 u32 portid = ctx->portid;
3158 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
3159 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3162 goto nla_put_failure;
3164 nfmsg = nlmsg_data(nlh);
3165 nfmsg->nfgen_family = ctx->family;
3166 nfmsg->version = NFNETLINK_V0;
3167 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
3169 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
3170 goto nla_put_failure;
3171 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
3172 goto nla_put_failure;
3173 if (nla_put_be64(skb, NFTA_SET_HANDLE, cpu_to_be64(set->handle),
3175 goto nla_put_failure;
3176 if (set->flags != 0)
3177 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
3178 goto nla_put_failure;
3180 if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
3181 goto nla_put_failure;
3182 if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
3183 goto nla_put_failure;
3184 if (set->flags & NFT_SET_MAP) {
3185 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
3186 goto nla_put_failure;
3187 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
3188 goto nla_put_failure;
3190 if (set->flags & NFT_SET_OBJECT &&
3191 nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
3192 goto nla_put_failure;
3195 nla_put_be64(skb, NFTA_SET_TIMEOUT,
3196 nf_jiffies64_to_msecs(set->timeout),
3198 goto nla_put_failure;
3200 nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(set->gc_int)))
3201 goto nla_put_failure;
3203 if (set->policy != NFT_SET_POL_PERFORMANCE) {
3204 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
3205 goto nla_put_failure;
3209 nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
3210 goto nla_put_failure;
3212 desc = nla_nest_start(skb, NFTA_SET_DESC);
3214 goto nla_put_failure;
3216 nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
3217 goto nla_put_failure;
3218 nla_nest_end(skb, desc);
3220 nlmsg_end(skb, nlh);
3224 nlmsg_trim(skb, nlh);
3228 static void nf_tables_set_notify(const struct nft_ctx *ctx,
3229 const struct nft_set *set, int event,
3232 struct sk_buff *skb;
3233 u32 portid = ctx->portid;
3237 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
3240 skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
3244 err = nf_tables_fill_set(skb, ctx, set, event, 0);
3250 nfnetlink_send(skb, ctx->net, portid, NFNLGRP_NFTABLES, ctx->report,
3254 nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
3257 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
3259 const struct nft_set *set;
3260 unsigned int idx, s_idx = cb->args[0];
3261 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
3262 struct net *net = sock_net(skb->sk);
3263 struct nft_ctx *ctx = cb->data, ctx_set;
3269 cb->seq = net->nft.base_seq;
3271 list_for_each_entry_rcu(table, &net->nft.tables, list) {
3272 if (ctx->family != NFPROTO_UNSPEC &&
3273 ctx->family != table->family)
3276 if (ctx->table && ctx->table != table)
3280 if (cur_table != table)
3286 list_for_each_entry_rcu(set, &table->sets, list) {
3289 if (!nft_is_active(net, set))
3293 ctx_set.table = table;
3294 ctx_set.family = table->family;
3296 if (nf_tables_fill_set(skb, &ctx_set, set,
3300 cb->args[2] = (unsigned long) table;
3303 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3316 static int nf_tables_dump_sets_start(struct netlink_callback *cb)
3318 struct nft_ctx *ctx_dump = NULL;
3320 ctx_dump = kmemdup(cb->data, sizeof(*ctx_dump), GFP_ATOMIC);
3321 if (ctx_dump == NULL)
3324 cb->data = ctx_dump;
3328 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
3334 /* called with rcu_read_lock held */
3335 static int nf_tables_getset(struct net *net, struct sock *nlsk,
3336 struct sk_buff *skb, const struct nlmsghdr *nlh,
3337 const struct nlattr * const nla[],
3338 struct netlink_ext_ack *extack)
3340 u8 genmask = nft_genmask_cur(net);
3341 const struct nft_set *set;
3343 struct sk_buff *skb2;
3344 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3347 /* Verify existence before starting dump */
3348 err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, extack,
3353 if (nlh->nlmsg_flags & NLM_F_DUMP) {
3354 struct netlink_dump_control c = {
3355 .start = nf_tables_dump_sets_start,
3356 .dump = nf_tables_dump_sets,
3357 .done = nf_tables_dump_sets_done,
3359 .module = THIS_MODULE,
3362 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
3365 /* Only accept unspec with dump */
3366 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
3367 return -EAFNOSUPPORT;
3368 if (!nla[NFTA_SET_TABLE])
3371 set = nft_set_lookup(ctx.table, nla[NFTA_SET_NAME], genmask);
3373 return PTR_ERR(set);
3375 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
3379 err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
3381 goto err_fill_set_info;
3383 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
3390 static int nf_tables_set_desc_parse(const struct nft_ctx *ctx,
3391 struct nft_set_desc *desc,
3392 const struct nlattr *nla)
3394 struct nlattr *da[NFTA_SET_DESC_MAX + 1];
3397 err = nla_parse_nested(da, NFTA_SET_DESC_MAX, nla,
3398 nft_set_desc_policy, NULL);
3402 if (da[NFTA_SET_DESC_SIZE] != NULL)
3403 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
3408 static int nf_tables_newset(struct net *net, struct sock *nlsk,
3409 struct sk_buff *skb, const struct nlmsghdr *nlh,
3410 const struct nlattr * const nla[],
3411 struct netlink_ext_ack *extack)
3413 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3414 u8 genmask = nft_genmask_next(net);
3415 int family = nfmsg->nfgen_family;
3416 const struct nft_set_ops *ops;
3417 struct nft_table *table;
3418 struct nft_set *set;
3423 u32 ktype, dtype, flags, policy, gc_int, objtype;
3424 struct nft_set_desc desc;
3425 unsigned char *udata;
3429 if (nla[NFTA_SET_TABLE] == NULL ||
3430 nla[NFTA_SET_NAME] == NULL ||
3431 nla[NFTA_SET_KEY_LEN] == NULL ||
3432 nla[NFTA_SET_ID] == NULL)
3435 memset(&desc, 0, sizeof(desc));
3437 ktype = NFT_DATA_VALUE;
3438 if (nla[NFTA_SET_KEY_TYPE] != NULL) {
3439 ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
3440 if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
3444 desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
3445 if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
3449 if (nla[NFTA_SET_FLAGS] != NULL) {
3450 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
3451 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
3452 NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
3453 NFT_SET_MAP | NFT_SET_EVAL |
3456 /* Only one of these operations is supported */
3457 if ((flags & (NFT_SET_MAP | NFT_SET_OBJECT)) ==
3458 (NFT_SET_MAP | NFT_SET_OBJECT))
3460 if ((flags & (NFT_SET_EVAL | NFT_SET_OBJECT)) ==
3461 (NFT_SET_EVAL | NFT_SET_OBJECT))
3466 if (nla[NFTA_SET_DATA_TYPE] != NULL) {
3467 if (!(flags & NFT_SET_MAP))
3470 dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
3471 if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
3472 dtype != NFT_DATA_VERDICT)
3475 if (dtype != NFT_DATA_VERDICT) {
3476 if (nla[NFTA_SET_DATA_LEN] == NULL)
3478 desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
3479 if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
3482 desc.dlen = sizeof(struct nft_verdict);
3483 } else if (flags & NFT_SET_MAP)
3486 if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
3487 if (!(flags & NFT_SET_OBJECT))
3490 objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
3491 if (objtype == NFT_OBJECT_UNSPEC ||
3492 objtype > NFT_OBJECT_MAX)
3494 } else if (flags & NFT_SET_OBJECT)
3497 objtype = NFT_OBJECT_UNSPEC;
3500 if (nla[NFTA_SET_TIMEOUT] != NULL) {
3501 if (!(flags & NFT_SET_TIMEOUT))
3504 err = nf_msecs_to_jiffies64(nla[NFTA_SET_TIMEOUT], &timeout);
3509 if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
3510 if (!(flags & NFT_SET_TIMEOUT))
3512 gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
3515 policy = NFT_SET_POL_PERFORMANCE;
3516 if (nla[NFTA_SET_POLICY] != NULL)
3517 policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
3519 if (nla[NFTA_SET_DESC] != NULL) {
3520 err = nf_tables_set_desc_parse(&ctx, &desc, nla[NFTA_SET_DESC]);
3525 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, genmask);
3526 if (IS_ERR(table)) {
3527 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
3528 return PTR_ERR(table);
3531 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
3533 set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
3535 if (PTR_ERR(set) != -ENOENT) {
3536 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
3537 return PTR_ERR(set);
3540 if (nlh->nlmsg_flags & NLM_F_EXCL) {
3541 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
3544 if (nlh->nlmsg_flags & NLM_F_REPLACE)
3550 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
3553 ops = nft_select_set_ops(&ctx, nla, &desc, policy);
3555 return PTR_ERR(ops);
3558 if (nla[NFTA_SET_USERDATA])
3559 udlen = nla_len(nla[NFTA_SET_USERDATA]);
3562 if (ops->privsize != NULL)
3563 size = ops->privsize(nla, &desc);
3565 set = kvzalloc(sizeof(*set) + size + udlen, GFP_KERNEL);
3571 name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL);
3577 err = nf_tables_set_alloc_name(&ctx, set, name);
3584 udata = set->data + size;
3585 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
3588 INIT_LIST_HEAD(&set->bindings);
3590 write_pnet(&set->net, net);
3593 set->klen = desc.klen;
3595 set->objtype = objtype;
3596 set->dlen = desc.dlen;
3598 set->size = desc.size;
3599 set->policy = policy;
3602 set->timeout = timeout;
3603 set->gc_int = gc_int;
3604 set->handle = nf_tables_alloc_handle(table);
3606 err = ops->init(set, &desc, nla);
3610 err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
3614 list_add_tail_rcu(&set->list, &table->sets);
3625 module_put(to_set_type(ops)->owner);
3629 static void nft_set_destroy(struct nft_set *set)
3631 if (WARN_ON(set->use > 0))
3634 set->ops->destroy(set);
3635 module_put(to_set_type(set->ops)->owner);
3640 static int nf_tables_delset(struct net *net, struct sock *nlsk,
3641 struct sk_buff *skb, const struct nlmsghdr *nlh,
3642 const struct nlattr * const nla[],
3643 struct netlink_ext_ack *extack)
3645 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3646 u8 genmask = nft_genmask_next(net);
3647 const struct nlattr *attr;
3648 struct nft_set *set;
3652 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
3653 return -EAFNOSUPPORT;
3654 if (nla[NFTA_SET_TABLE] == NULL)
3657 err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, extack,
3662 if (nla[NFTA_SET_HANDLE]) {
3663 attr = nla[NFTA_SET_HANDLE];
3664 set = nft_set_lookup_byhandle(ctx.table, attr, genmask);
3666 attr = nla[NFTA_SET_NAME];
3667 set = nft_set_lookup(ctx.table, attr, genmask);
3671 NL_SET_BAD_ATTR(extack, attr);
3672 return PTR_ERR(set);
3675 (nlh->nlmsg_flags & NLM_F_NONREC && atomic_read(&set->nelems) > 0)) {
3676 NL_SET_BAD_ATTR(extack, attr);
3680 return nft_delset(&ctx, set);
3683 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
3684 struct nft_set *set,
3685 const struct nft_set_iter *iter,
3686 struct nft_set_elem *elem)
3688 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
3689 enum nft_registers dreg;
3691 dreg = nft_type_to_reg(set->dtype);
3692 return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
3693 set->dtype == NFT_DATA_VERDICT ?
3694 NFT_DATA_VERDICT : NFT_DATA_VALUE,
3698 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
3699 struct nft_set_binding *binding)
3701 struct nft_set_binding *i;
3702 struct nft_set_iter iter;
3704 if (set->use == UINT_MAX)
3707 if (!list_empty(&set->bindings) && nft_set_is_anonymous(set))
3710 if (binding->flags & NFT_SET_MAP) {
3711 /* If the set is already bound to the same chain all
3712 * jumps are already validated for that chain.
3714 list_for_each_entry(i, &set->bindings, list) {
3715 if (i->flags & NFT_SET_MAP &&
3716 i->chain == binding->chain)
3720 iter.genmask = nft_genmask_next(ctx->net);
3724 iter.fn = nf_tables_bind_check_setelem;
3726 set->ops->walk(ctx, set, &iter);
3731 binding->chain = ctx->chain;
3732 list_add_tail_rcu(&binding->list, &set->bindings);
3733 nft_set_trans_bind(ctx, set);
3738 EXPORT_SYMBOL_GPL(nf_tables_bind_set);
3740 void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
3741 struct nft_set_binding *binding, bool event)
3743 list_del_rcu(&binding->list);
3745 if (list_empty(&set->bindings) && nft_set_is_anonymous(set)) {
3746 list_del_rcu(&set->list);
3748 nf_tables_set_notify(ctx, set, NFT_MSG_DELSET,
3752 EXPORT_SYMBOL_GPL(nf_tables_unbind_set);
3754 void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set,
3755 struct nft_set_binding *binding,
3756 enum nft_trans_phase phase)
3759 case NFT_TRANS_PREPARE:
3762 case NFT_TRANS_ABORT:
3763 case NFT_TRANS_RELEASE:
3767 nf_tables_unbind_set(ctx, set, binding,
3768 phase == NFT_TRANS_COMMIT);
3771 EXPORT_SYMBOL_GPL(nf_tables_deactivate_set);
3773 void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set)
3775 if (list_empty(&set->bindings) && nft_set_is_anonymous(set))
3776 nft_set_destroy(set);
3778 EXPORT_SYMBOL_GPL(nf_tables_destroy_set);
3780 const struct nft_set_ext_type nft_set_ext_types[] = {
3781 [NFT_SET_EXT_KEY] = {
3782 .align = __alignof__(u32),
3784 [NFT_SET_EXT_DATA] = {
3785 .align = __alignof__(u32),
3787 [NFT_SET_EXT_EXPR] = {
3788 .align = __alignof__(struct nft_expr),
3790 [NFT_SET_EXT_OBJREF] = {
3791 .len = sizeof(struct nft_object *),
3792 .align = __alignof__(struct nft_object *),
3794 [NFT_SET_EXT_FLAGS] = {
3796 .align = __alignof__(u8),
3798 [NFT_SET_EXT_TIMEOUT] = {
3800 .align = __alignof__(u64),
3802 [NFT_SET_EXT_EXPIRATION] = {
3804 .align = __alignof__(u64),
3806 [NFT_SET_EXT_USERDATA] = {
3807 .len = sizeof(struct nft_userdata),
3808 .align = __alignof__(struct nft_userdata),
3811 EXPORT_SYMBOL_GPL(nft_set_ext_types);
3817 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
3818 [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED },
3819 [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED },
3820 [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 },
3821 [NFTA_SET_ELEM_TIMEOUT] = { .type = NLA_U64 },
3822 [NFTA_SET_ELEM_USERDATA] = { .type = NLA_BINARY,
3823 .len = NFT_USERDATA_MAXLEN },
3824 [NFTA_SET_ELEM_EXPR] = { .type = NLA_NESTED },
3825 [NFTA_SET_ELEM_OBJREF] = { .type = NLA_STRING,
3826 .len = NFT_OBJ_MAXNAMELEN - 1 },
3829 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
3830 [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING,
3831 .len = NFT_TABLE_MAXNAMELEN - 1 },
3832 [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING,
3833 .len = NFT_SET_MAXNAMELEN - 1 },
3834 [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED },
3835 [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 },
3838 static int nft_ctx_init_from_elemattr(struct nft_ctx *ctx, struct net *net,
3839 const struct sk_buff *skb,
3840 const struct nlmsghdr *nlh,
3841 const struct nlattr * const nla[],
3842 struct netlink_ext_ack *extack,
3845 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3846 int family = nfmsg->nfgen_family;
3847 struct nft_table *table;
3849 table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
3851 if (IS_ERR(table)) {
3852 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
3853 return PTR_ERR(table);
3856 nft_ctx_init(ctx, net, skb, nlh, family, table, NULL, nla);
3860 static int nf_tables_fill_setelem(struct sk_buff *skb,
3861 const struct nft_set *set,
3862 const struct nft_set_elem *elem)
3864 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
3865 unsigned char *b = skb_tail_pointer(skb);
3866 struct nlattr *nest;
3868 nest = nla_nest_start(skb, NFTA_LIST_ELEM);
3870 goto nla_put_failure;
3872 if (nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
3873 NFT_DATA_VALUE, set->klen) < 0)
3874 goto nla_put_failure;
3876 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
3877 nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
3878 set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
3880 goto nla_put_failure;
3882 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR) &&
3883 nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, nft_set_ext_expr(ext)) < 0)
3884 goto nla_put_failure;
3886 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
3887 nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
3888 (*nft_set_ext_obj(ext))->name) < 0)
3889 goto nla_put_failure;
3891 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
3892 nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
3893 htonl(*nft_set_ext_flags(ext))))
3894 goto nla_put_failure;
3896 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
3897 nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
3898 nf_jiffies64_to_msecs(*nft_set_ext_timeout(ext)),
3900 goto nla_put_failure;
3902 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
3903 u64 expires, now = get_jiffies_64();
3905 expires = *nft_set_ext_expiration(ext);
3906 if (time_before64(now, expires))
3911 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
3912 nf_jiffies64_to_msecs(expires),
3914 goto nla_put_failure;
3917 if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
3918 struct nft_userdata *udata;
3920 udata = nft_set_ext_userdata(ext);
3921 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
3922 udata->len + 1, udata->data))
3923 goto nla_put_failure;
3926 nla_nest_end(skb, nest);
3934 struct nft_set_dump_args {
3935 const struct netlink_callback *cb;
3936 struct nft_set_iter iter;
3937 struct sk_buff *skb;
3940 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
3941 struct nft_set *set,
3942 const struct nft_set_iter *iter,
3943 struct nft_set_elem *elem)
3945 struct nft_set_dump_args *args;
3947 args = container_of(iter, struct nft_set_dump_args, iter);
3948 return nf_tables_fill_setelem(args->skb, set, elem);
3951 struct nft_set_dump_ctx {
3952 const struct nft_set *set;
3956 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
3958 struct nft_set_dump_ctx *dump_ctx = cb->data;
3959 struct net *net = sock_net(skb->sk);
3960 struct nft_table *table;
3961 struct nft_set *set;
3962 struct nft_set_dump_args args;
3963 bool set_found = false;
3964 struct nfgenmsg *nfmsg;
3965 struct nlmsghdr *nlh;
3966 struct nlattr *nest;
3971 list_for_each_entry_rcu(table, &net->nft.tables, list) {
3972 if (dump_ctx->ctx.family != NFPROTO_UNSPEC &&
3973 dump_ctx->ctx.family != table->family)
3976 if (table != dump_ctx->ctx.table)
3979 list_for_each_entry_rcu(set, &table->sets, list) {
3980 if (set == dump_ctx->set) {
3993 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM);
3994 portid = NETLINK_CB(cb->skb).portid;
3995 seq = cb->nlh->nlmsg_seq;
3997 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
4000 goto nla_put_failure;
4002 nfmsg = nlmsg_data(nlh);
4003 nfmsg->nfgen_family = table->family;
4004 nfmsg->version = NFNETLINK_V0;
4005 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
4007 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name))
4008 goto nla_put_failure;
4009 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
4010 goto nla_put_failure;
4012 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
4014 goto nla_put_failure;
4018 args.iter.genmask = nft_genmask_cur(net);
4019 args.iter.skip = cb->args[0];
4020 args.iter.count = 0;
4022 args.iter.fn = nf_tables_dump_setelem;
4023 set->ops->walk(&dump_ctx->ctx, set, &args.iter);
4026 nla_nest_end(skb, nest);
4027 nlmsg_end(skb, nlh);
4029 if (args.iter.err && args.iter.err != -EMSGSIZE)
4030 return args.iter.err;
4031 if (args.iter.count == cb->args[0])
4034 cb->args[0] = args.iter.count;
4042 static int nf_tables_dump_set_start(struct netlink_callback *cb)
4044 struct nft_set_dump_ctx *dump_ctx = cb->data;
4046 cb->data = kmemdup(dump_ctx, sizeof(*dump_ctx), GFP_ATOMIC);
4048 return cb->data ? 0 : -ENOMEM;
4051 static int nf_tables_dump_set_done(struct netlink_callback *cb)
4057 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
4058 const struct nft_ctx *ctx, u32 seq,
4059 u32 portid, int event, u16 flags,
4060 const struct nft_set *set,
4061 const struct nft_set_elem *elem)
4063 struct nfgenmsg *nfmsg;
4064 struct nlmsghdr *nlh;
4065 struct nlattr *nest;
4068 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
4069 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
4072 goto nla_put_failure;
4074 nfmsg = nlmsg_data(nlh);
4075 nfmsg->nfgen_family = ctx->family;
4076 nfmsg->version = NFNETLINK_V0;
4077 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
4079 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
4080 goto nla_put_failure;
4081 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
4082 goto nla_put_failure;
4084 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
4086 goto nla_put_failure;
4088 err = nf_tables_fill_setelem(skb, set, elem);
4090 goto nla_put_failure;
4092 nla_nest_end(skb, nest);
4094 nlmsg_end(skb, nlh);
4098 nlmsg_trim(skb, nlh);
4102 static int nft_setelem_parse_flags(const struct nft_set *set,
4103 const struct nlattr *attr, u32 *flags)
4108 *flags = ntohl(nla_get_be32(attr));
4109 if (*flags & ~NFT_SET_ELEM_INTERVAL_END)
4111 if (!(set->flags & NFT_SET_INTERVAL) &&
4112 *flags & NFT_SET_ELEM_INTERVAL_END)
4118 static int nft_get_set_elem(struct nft_ctx *ctx, struct nft_set *set,
4119 const struct nlattr *attr)
4121 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
4122 struct nft_data_desc desc;
4123 struct nft_set_elem elem;
4124 struct sk_buff *skb;
4129 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
4130 nft_set_elem_policy, NULL);
4134 if (!nla[NFTA_SET_ELEM_KEY])
4137 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
4141 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &desc,
4142 nla[NFTA_SET_ELEM_KEY]);
4147 if (desc.type != NFT_DATA_VALUE || desc.len != set->klen) {
4148 nft_data_release(&elem.key.val, desc.type);
4152 priv = set->ops->get(ctx->net, set, &elem, flags);
4154 return PTR_ERR(priv);
4159 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
4163 err = nf_tables_fill_setelem_info(skb, ctx, ctx->seq, ctx->portid,
4164 NFT_MSG_NEWSETELEM, 0, set, &elem);
4166 goto err_fill_setelem;
4168 return nfnetlink_unicast(skb, ctx->net, ctx->portid);
4175 /* called with rcu_read_lock held */
4176 static int nf_tables_getsetelem(struct net *net, struct sock *nlsk,
4177 struct sk_buff *skb, const struct nlmsghdr *nlh,
4178 const struct nlattr * const nla[],
4179 struct netlink_ext_ack *extack)
4181 u8 genmask = nft_genmask_cur(net);
4182 struct nft_set *set;
4183 struct nlattr *attr;
4187 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack,
4192 set = nft_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
4194 return PTR_ERR(set);
4196 if (nlh->nlmsg_flags & NLM_F_DUMP) {
4197 struct netlink_dump_control c = {
4198 .start = nf_tables_dump_set_start,
4199 .dump = nf_tables_dump_set,
4200 .done = nf_tables_dump_set_done,
4201 .module = THIS_MODULE,
4203 struct nft_set_dump_ctx dump_ctx = {
4209 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
4212 if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
4215 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
4216 err = nft_get_set_elem(&ctx, set, attr);
4224 static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
4225 const struct nft_set *set,
4226 const struct nft_set_elem *elem,
4227 int event, u16 flags)
4229 struct net *net = ctx->net;
4230 u32 portid = ctx->portid;
4231 struct sk_buff *skb;
4234 if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
4237 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
4241 err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
4248 nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, ctx->report,
4252 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
4255 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
4257 struct nft_set *set)
4259 struct nft_trans *trans;
4261 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
4265 nft_trans_elem_set(trans) = set;
4269 void *nft_set_elem_init(const struct nft_set *set,
4270 const struct nft_set_ext_tmpl *tmpl,
4271 const u32 *key, const u32 *data,
4272 u64 timeout, gfp_t gfp)
4274 struct nft_set_ext *ext;
4277 elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
4281 ext = nft_set_elem_ext(set, elem);
4282 nft_set_ext_init(ext, tmpl);
4284 memcpy(nft_set_ext_key(ext), key, set->klen);
4285 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
4286 memcpy(nft_set_ext_data(ext), data, set->dlen);
4287 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION))
4288 *nft_set_ext_expiration(ext) =
4289 get_jiffies_64() + timeout;
4290 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
4291 *nft_set_ext_timeout(ext) = timeout;
4296 void nft_set_elem_destroy(const struct nft_set *set, void *elem,
4299 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
4300 struct nft_ctx ctx = {
4301 .net = read_pnet(&set->net),
4302 .family = set->table->family,
4305 nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE);
4306 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
4307 nft_data_release(nft_set_ext_data(ext), set->dtype);
4308 if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPR)) {
4309 struct nft_expr *expr = nft_set_ext_expr(ext);
4311 if (expr->ops->destroy_clone) {
4312 expr->ops->destroy_clone(&ctx, expr);
4313 module_put(expr->ops->type->owner);
4315 nf_tables_expr_destroy(&ctx, expr);
4318 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
4319 (*nft_set_ext_obj(ext))->use--;
4322 EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
4324 /* Only called from commit path, nft_set_elem_deactivate() already deals with
4325 * the refcounting from the preparation phase.
4327 static void nf_tables_set_elem_destroy(const struct nft_ctx *ctx,
4328 const struct nft_set *set, void *elem)
4330 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
4332 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR))
4333 nf_tables_expr_destroy(ctx, nft_set_ext_expr(ext));
4337 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
4338 const struct nlattr *attr, u32 nlmsg_flags)
4340 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
4341 u8 genmask = nft_genmask_next(ctx->net);
4342 struct nft_data_desc d1, d2;
4343 struct nft_set_ext_tmpl tmpl;
4344 struct nft_set_ext *ext, *ext2;
4345 struct nft_set_elem elem;
4346 struct nft_set_binding *binding;
4347 struct nft_object *obj = NULL;
4348 struct nft_userdata *udata;
4349 struct nft_data data;
4350 enum nft_registers dreg;
4351 struct nft_trans *trans;
4357 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
4358 nft_set_elem_policy, NULL);
4362 if (nla[NFTA_SET_ELEM_KEY] == NULL)
4365 nft_set_ext_prepare(&tmpl);
4367 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
4371 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
4373 if (set->flags & NFT_SET_MAP) {
4374 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
4375 !(flags & NFT_SET_ELEM_INTERVAL_END))
4378 if (nla[NFTA_SET_ELEM_DATA] != NULL)
4382 if ((flags & NFT_SET_ELEM_INTERVAL_END) &&
4383 (nla[NFTA_SET_ELEM_DATA] ||
4384 nla[NFTA_SET_ELEM_OBJREF] ||
4385 nla[NFTA_SET_ELEM_TIMEOUT] ||
4386 nla[NFTA_SET_ELEM_EXPIRATION] ||
4387 nla[NFTA_SET_ELEM_USERDATA] ||
4388 nla[NFTA_SET_ELEM_EXPR]))
4392 if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
4393 if (!(set->flags & NFT_SET_TIMEOUT))
4395 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_TIMEOUT],
4399 } else if (set->flags & NFT_SET_TIMEOUT) {
4400 timeout = set->timeout;
4403 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &d1,
4404 nla[NFTA_SET_ELEM_KEY]);
4408 if (d1.type != NFT_DATA_VALUE || d1.len != set->klen)
4411 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, d1.len);
4413 nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
4414 if (timeout != set->timeout)
4415 nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
4418 if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
4419 if (!(set->flags & NFT_SET_OBJECT)) {
4423 obj = nft_obj_lookup(ctx->table, nla[NFTA_SET_ELEM_OBJREF],
4424 set->objtype, genmask);
4429 nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
4432 if (nla[NFTA_SET_ELEM_DATA] != NULL) {
4433 err = nft_data_init(ctx, &data, sizeof(data), &d2,
4434 nla[NFTA_SET_ELEM_DATA]);
4439 if (set->dtype != NFT_DATA_VERDICT && d2.len != set->dlen)
4442 dreg = nft_type_to_reg(set->dtype);
4443 list_for_each_entry(binding, &set->bindings, list) {
4444 struct nft_ctx bind_ctx = {
4446 .family = ctx->family,
4447 .table = ctx->table,
4448 .chain = (struct nft_chain *)binding->chain,
4451 if (!(binding->flags & NFT_SET_MAP))
4454 err = nft_validate_register_store(&bind_ctx, dreg,
4460 if (d2.type == NFT_DATA_VERDICT &&
4461 (data.verdict.code == NFT_GOTO ||
4462 data.verdict.code == NFT_JUMP))
4463 nft_validate_state_update(ctx->net,
4467 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, d2.len);
4470 /* The full maximum length of userdata can exceed the maximum
4471 * offset value (U8_MAX) for following extensions, therefor it
4472 * must be the last extension added.
4475 if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
4476 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
4478 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
4483 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, data.data,
4484 timeout, GFP_KERNEL);
4485 if (elem.priv == NULL)
4488 ext = nft_set_elem_ext(set, elem.priv);
4490 *nft_set_ext_flags(ext) = flags;
4492 udata = nft_set_ext_userdata(ext);
4493 udata->len = ulen - 1;
4494 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
4497 *nft_set_ext_obj(ext) = obj;
4501 trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
4505 ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK;
4506 err = set->ops->insert(ctx->net, set, &elem, &ext2);
4508 if (err == -EEXIST) {
4509 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^
4510 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) ||
4511 nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^
4512 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF)) {
4516 if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
4517 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
4518 memcmp(nft_set_ext_data(ext),
4519 nft_set_ext_data(ext2), set->dlen) != 0) ||
4520 (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
4521 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
4522 *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
4524 else if (!(nlmsg_flags & NLM_F_EXCL))
4531 !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact)) {
4536 nft_trans_elem(trans) = elem;
4537 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
4541 set->ops->remove(ctx->net, set, &elem);
4549 if (nla[NFTA_SET_ELEM_DATA] != NULL)
4550 nft_data_release(&data, d2.type);
4552 nft_data_release(&elem.key.val, d1.type);
4557 static int nf_tables_newsetelem(struct net *net, struct sock *nlsk,
4558 struct sk_buff *skb, const struct nlmsghdr *nlh,
4559 const struct nlattr * const nla[],
4560 struct netlink_ext_ack *extack)
4562 u8 genmask = nft_genmask_next(net);
4563 const struct nlattr *attr;
4564 struct nft_set *set;
4568 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
4571 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack,
4576 set = nft_set_lookup_global(net, ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
4577 nla[NFTA_SET_ELEM_LIST_SET_ID], genmask);
4579 return PTR_ERR(set);
4581 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
4584 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
4585 err = nft_add_set_elem(&ctx, set, attr, nlh->nlmsg_flags);
4590 if (net->nft.validate_state == NFT_VALIDATE_DO)
4591 return nft_table_validate(net, ctx.table);
4597 * nft_data_hold - hold a nft_data item
4599 * @data: struct nft_data to release
4600 * @type: type of data
4602 * Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded,
4603 * NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and
4604 * NFT_GOTO verdicts. This function must be called on active data objects
4605 * from the second phase of the commit protocol.
4607 void nft_data_hold(const struct nft_data *data, enum nft_data_types type)
4609 if (type == NFT_DATA_VERDICT) {
4610 switch (data->verdict.code) {
4613 data->verdict.chain->use++;
4619 static void nft_set_elem_activate(const struct net *net,
4620 const struct nft_set *set,
4621 struct nft_set_elem *elem)
4623 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4625 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
4626 nft_data_hold(nft_set_ext_data(ext), set->dtype);
4627 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
4628 (*nft_set_ext_obj(ext))->use++;
4631 static void nft_set_elem_deactivate(const struct net *net,
4632 const struct nft_set *set,
4633 struct nft_set_elem *elem)
4635 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4637 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
4638 nft_data_release(nft_set_ext_data(ext), set->dtype);
4639 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
4640 (*nft_set_ext_obj(ext))->use--;
4643 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
4644 const struct nlattr *attr)
4646 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
4647 struct nft_set_ext_tmpl tmpl;
4648 struct nft_data_desc desc;
4649 struct nft_set_elem elem;
4650 struct nft_set_ext *ext;
4651 struct nft_trans *trans;
4656 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
4657 nft_set_elem_policy, NULL);
4662 if (nla[NFTA_SET_ELEM_KEY] == NULL)
4665 nft_set_ext_prepare(&tmpl);
4667 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
4671 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
4673 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &desc,
4674 nla[NFTA_SET_ELEM_KEY]);
4679 if (desc.type != NFT_DATA_VALUE || desc.len != set->klen)
4682 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, desc.len);
4685 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, NULL, 0,
4687 if (elem.priv == NULL)
4690 ext = nft_set_elem_ext(set, elem.priv);
4692 *nft_set_ext_flags(ext) = flags;
4694 trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
4695 if (trans == NULL) {
4700 priv = set->ops->deactivate(ctx->net, set, &elem);
4708 nft_set_elem_deactivate(ctx->net, set, &elem);
4710 nft_trans_elem(trans) = elem;
4711 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
4719 nft_data_release(&elem.key.val, desc.type);
4724 static int nft_flush_set(const struct nft_ctx *ctx,
4725 struct nft_set *set,
4726 const struct nft_set_iter *iter,
4727 struct nft_set_elem *elem)
4729 struct nft_trans *trans;
4732 trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
4733 sizeof(struct nft_trans_elem), GFP_ATOMIC);
4737 if (!set->ops->flush(ctx->net, set, elem->priv)) {
4743 nft_set_elem_deactivate(ctx->net, set, elem);
4744 nft_trans_elem_set(trans) = set;
4745 nft_trans_elem(trans) = *elem;
4746 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
4754 static int nf_tables_delsetelem(struct net *net, struct sock *nlsk,
4755 struct sk_buff *skb, const struct nlmsghdr *nlh,
4756 const struct nlattr * const nla[],
4757 struct netlink_ext_ack *extack)
4759 u8 genmask = nft_genmask_next(net);
4760 const struct nlattr *attr;
4761 struct nft_set *set;
4765 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack,
4770 set = nft_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
4772 return PTR_ERR(set);
4773 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
4776 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL) {
4777 struct nft_set_iter iter = {
4779 .fn = nft_flush_set,
4781 set->ops->walk(&ctx, set, &iter);
4786 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
4787 err = nft_del_setelem(&ctx, set, attr);
4796 void nft_set_gc_batch_release(struct rcu_head *rcu)
4798 struct nft_set_gc_batch *gcb;
4801 gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu);
4802 for (i = 0; i < gcb->head.cnt; i++)
4803 nft_set_elem_destroy(gcb->head.set, gcb->elems[i], true);
4806 EXPORT_SYMBOL_GPL(nft_set_gc_batch_release);
4808 struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
4811 struct nft_set_gc_batch *gcb;
4813 gcb = kzalloc(sizeof(*gcb), gfp);
4816 gcb->head.set = set;
4819 EXPORT_SYMBOL_GPL(nft_set_gc_batch_alloc);
4826 * nft_register_obj- register nf_tables stateful object type
4829 * Registers the object type for use with nf_tables. Returns zero on
4830 * success or a negative errno code otherwise.
4832 int nft_register_obj(struct nft_object_type *obj_type)
4834 if (obj_type->type == NFT_OBJECT_UNSPEC)
4837 nfnl_lock(NFNL_SUBSYS_NFTABLES);
4838 list_add_rcu(&obj_type->list, &nf_tables_objects);
4839 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
4842 EXPORT_SYMBOL_GPL(nft_register_obj);
4845 * nft_unregister_obj - unregister nf_tables object type
4848 * Unregisters the object type for use with nf_tables.
4850 void nft_unregister_obj(struct nft_object_type *obj_type)
4852 nfnl_lock(NFNL_SUBSYS_NFTABLES);
4853 list_del_rcu(&obj_type->list);
4854 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
4856 EXPORT_SYMBOL_GPL(nft_unregister_obj);
4858 struct nft_object *nft_obj_lookup(const struct nft_table *table,
4859 const struct nlattr *nla, u32 objtype,
4862 struct nft_object *obj;
4864 list_for_each_entry_rcu(obj, &table->objects, list) {
4865 if (!nla_strcmp(nla, obj->name) &&
4866 objtype == obj->ops->type->type &&
4867 nft_active_genmask(obj, genmask))
4870 return ERR_PTR(-ENOENT);
4872 EXPORT_SYMBOL_GPL(nft_obj_lookup);
4874 static struct nft_object *nft_obj_lookup_byhandle(const struct nft_table *table,
4875 const struct nlattr *nla,
4876 u32 objtype, u8 genmask)
4878 struct nft_object *obj;
4880 list_for_each_entry(obj, &table->objects, list) {
4881 if (be64_to_cpu(nla_get_be64(nla)) == obj->handle &&
4882 objtype == obj->ops->type->type &&
4883 nft_active_genmask(obj, genmask))
4886 return ERR_PTR(-ENOENT);
4889 static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
4890 [NFTA_OBJ_TABLE] = { .type = NLA_STRING,
4891 .len = NFT_TABLE_MAXNAMELEN - 1 },
4892 [NFTA_OBJ_NAME] = { .type = NLA_STRING,
4893 .len = NFT_OBJ_MAXNAMELEN - 1 },
4894 [NFTA_OBJ_TYPE] = { .type = NLA_U32 },
4895 [NFTA_OBJ_DATA] = { .type = NLA_NESTED },
4896 [NFTA_OBJ_HANDLE] = { .type = NLA_U64},
4899 static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,
4900 const struct nft_object_type *type,
4901 const struct nlattr *attr)
4904 const struct nft_object_ops *ops;
4905 struct nft_object *obj;
4908 tb = kmalloc_array(type->maxattr + 1, sizeof(*tb), GFP_KERNEL);
4913 err = nla_parse_nested(tb, type->maxattr, attr, type->policy,
4918 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
4921 if (type->select_ops) {
4922 ops = type->select_ops(ctx, (const struct nlattr * const *)tb);
4932 obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL);
4936 err = ops->init(ctx, (const struct nlattr * const *)tb, obj);
4949 return ERR_PTR(err);
4952 static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
4953 struct nft_object *obj, bool reset)
4955 struct nlattr *nest;
4957 nest = nla_nest_start(skb, attr);
4959 goto nla_put_failure;
4960 if (obj->ops->dump(skb, obj, reset) < 0)
4961 goto nla_put_failure;
4962 nla_nest_end(skb, nest);
4969 static const struct nft_object_type *__nft_obj_type_get(u32 objtype)
4971 const struct nft_object_type *type;
4973 list_for_each_entry(type, &nf_tables_objects, list) {
4974 if (objtype == type->type)
4980 static const struct nft_object_type *
4981 nft_obj_type_get(struct net *net, u32 objtype)
4983 const struct nft_object_type *type;
4985 type = __nft_obj_type_get(objtype);
4986 if (type != NULL && try_module_get(type->owner))
4989 lockdep_nfnl_nft_mutex_not_held();
4990 #ifdef CONFIG_MODULES
4992 nft_request_module(net, "nft-obj-%u", objtype);
4993 if (__nft_obj_type_get(objtype))
4994 return ERR_PTR(-EAGAIN);
4997 return ERR_PTR(-ENOENT);
5000 static int nf_tables_newobj(struct net *net, struct sock *nlsk,
5001 struct sk_buff *skb, const struct nlmsghdr *nlh,
5002 const struct nlattr * const nla[],
5003 struct netlink_ext_ack *extack)
5005 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
5006 const struct nft_object_type *type;
5007 u8 genmask = nft_genmask_next(net);
5008 int family = nfmsg->nfgen_family;
5009 struct nft_table *table;
5010 struct nft_object *obj;
5015 if (!nla[NFTA_OBJ_TYPE] ||
5016 !nla[NFTA_OBJ_NAME] ||
5017 !nla[NFTA_OBJ_DATA])
5020 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask);
5021 if (IS_ERR(table)) {
5022 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
5023 return PTR_ERR(table);
5026 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
5027 obj = nft_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask);
5030 if (err != -ENOENT) {
5031 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
5035 if (nlh->nlmsg_flags & NLM_F_EXCL) {
5036 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
5042 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
5044 type = nft_obj_type_get(net, objtype);
5046 return PTR_ERR(type);
5048 obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]);
5054 obj->handle = nf_tables_alloc_handle(table);
5056 obj->name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL);
5062 err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
5066 list_add_tail_rcu(&obj->list, &table->objects);
5072 if (obj->ops->destroy)
5073 obj->ops->destroy(&ctx, obj);
5076 module_put(type->owner);
5080 static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
5081 u32 portid, u32 seq, int event, u32 flags,
5082 int family, const struct nft_table *table,
5083 struct nft_object *obj, bool reset)
5085 struct nfgenmsg *nfmsg;
5086 struct nlmsghdr *nlh;
5088 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
5089 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
5091 goto nla_put_failure;
5093 nfmsg = nlmsg_data(nlh);
5094 nfmsg->nfgen_family = family;
5095 nfmsg->version = NFNETLINK_V0;
5096 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
5098 if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
5099 nla_put_string(skb, NFTA_OBJ_NAME, obj->name) ||
5100 nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) ||
5101 nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
5102 nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset) ||
5103 nla_put_be64(skb, NFTA_OBJ_HANDLE, cpu_to_be64(obj->handle),
5105 goto nla_put_failure;
5107 nlmsg_end(skb, nlh);
5111 nlmsg_trim(skb, nlh);
5115 struct nft_obj_filter {
5120 static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
5122 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
5123 const struct nft_table *table;
5124 unsigned int idx = 0, s_idx = cb->args[0];
5125 struct nft_obj_filter *filter = cb->data;
5126 struct net *net = sock_net(skb->sk);
5127 int family = nfmsg->nfgen_family;
5128 struct nft_object *obj;
5131 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
5135 cb->seq = net->nft.base_seq;
5137 list_for_each_entry_rcu(table, &net->nft.tables, list) {
5138 if (family != NFPROTO_UNSPEC && family != table->family)
5141 list_for_each_entry_rcu(obj, &table->objects, list) {
5142 if (!nft_is_active(net, obj))
5147 memset(&cb->args[1], 0,
5148 sizeof(cb->args) - sizeof(cb->args[0]));
5149 if (filter && filter->table &&
5150 strcmp(filter->table, table->name))
5153 filter->type != NFT_OBJECT_UNSPEC &&
5154 obj->ops->type->type != filter->type)
5157 if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid,
5160 NLM_F_MULTI | NLM_F_APPEND,
5161 table->family, table,
5165 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
5177 static int nf_tables_dump_obj_start(struct netlink_callback *cb)
5179 const struct nlattr * const *nla = cb->data;
5180 struct nft_obj_filter *filter = NULL;
5182 if (nla[NFTA_OBJ_TABLE] || nla[NFTA_OBJ_TYPE]) {
5183 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
5187 if (nla[NFTA_OBJ_TABLE]) {
5188 filter->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_ATOMIC);
5189 if (!filter->table) {
5195 if (nla[NFTA_OBJ_TYPE])
5196 filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
5203 static int nf_tables_dump_obj_done(struct netlink_callback *cb)
5205 struct nft_obj_filter *filter = cb->data;
5208 kfree(filter->table);
5215 /* called with rcu_read_lock held */
5216 static int nf_tables_getobj(struct net *net, struct sock *nlsk,
5217 struct sk_buff *skb, const struct nlmsghdr *nlh,
5218 const struct nlattr * const nla[],
5219 struct netlink_ext_ack *extack)
5221 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
5222 u8 genmask = nft_genmask_cur(net);
5223 int family = nfmsg->nfgen_family;
5224 const struct nft_table *table;
5225 struct nft_object *obj;
5226 struct sk_buff *skb2;
5231 if (nlh->nlmsg_flags & NLM_F_DUMP) {
5232 struct netlink_dump_control c = {
5233 .start = nf_tables_dump_obj_start,
5234 .dump = nf_tables_dump_obj,
5235 .done = nf_tables_dump_obj_done,
5236 .module = THIS_MODULE,
5237 .data = (void *)nla,
5240 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
5243 if (!nla[NFTA_OBJ_NAME] ||
5244 !nla[NFTA_OBJ_TYPE])
5247 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask);
5248 if (IS_ERR(table)) {
5249 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
5250 return PTR_ERR(table);
5253 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
5254 obj = nft_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask);
5256 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
5257 return PTR_ERR(obj);
5260 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
5264 if (NFNL_MSG_TYPE(nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
5267 err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
5268 nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
5269 family, table, obj, reset);
5271 goto err_fill_obj_info;
5273 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
5280 static void nft_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj)
5282 if (obj->ops->destroy)
5283 obj->ops->destroy(ctx, obj);
5285 module_put(obj->ops->type->owner);
5290 static int nf_tables_delobj(struct net *net, struct sock *nlsk,
5291 struct sk_buff *skb, const struct nlmsghdr *nlh,
5292 const struct nlattr * const nla[],
5293 struct netlink_ext_ack *extack)
5295 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
5296 u8 genmask = nft_genmask_next(net);
5297 int family = nfmsg->nfgen_family;
5298 const struct nlattr *attr;
5299 struct nft_table *table;
5300 struct nft_object *obj;
5304 if (!nla[NFTA_OBJ_TYPE] ||
5305 (!nla[NFTA_OBJ_NAME] && !nla[NFTA_OBJ_HANDLE]))
5308 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask);
5309 if (IS_ERR(table)) {
5310 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
5311 return PTR_ERR(table);
5314 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
5315 if (nla[NFTA_OBJ_HANDLE]) {
5316 attr = nla[NFTA_OBJ_HANDLE];
5317 obj = nft_obj_lookup_byhandle(table, attr, objtype, genmask);
5319 attr = nla[NFTA_OBJ_NAME];
5320 obj = nft_obj_lookup(table, attr, objtype, genmask);
5324 NL_SET_BAD_ATTR(extack, attr);
5325 return PTR_ERR(obj);
5328 NL_SET_BAD_ATTR(extack, attr);
5332 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
5334 return nft_delobj(&ctx, obj);
5337 void nft_obj_notify(struct net *net, struct nft_table *table,
5338 struct nft_object *obj, u32 portid, u32 seq, int event,
5339 int family, int report, gfp_t gfp)
5341 struct sk_buff *skb;
5345 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
5348 skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
5352 err = nf_tables_fill_obj_info(skb, net, portid, seq, event, 0, family,
5359 nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, report, gfp);
5362 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
5364 EXPORT_SYMBOL_GPL(nft_obj_notify);
5366 static void nf_tables_obj_notify(const struct nft_ctx *ctx,
5367 struct nft_object *obj, int event)
5369 nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid, ctx->seq, event,
5370 ctx->family, ctx->report, GFP_KERNEL);
5376 void nft_register_flowtable_type(struct nf_flowtable_type *type)
5378 nfnl_lock(NFNL_SUBSYS_NFTABLES);
5379 list_add_tail_rcu(&type->list, &nf_tables_flowtables);
5380 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
5382 EXPORT_SYMBOL_GPL(nft_register_flowtable_type);
5384 void nft_unregister_flowtable_type(struct nf_flowtable_type *type)
5386 nfnl_lock(NFNL_SUBSYS_NFTABLES);
5387 list_del_rcu(&type->list);
5388 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
5390 EXPORT_SYMBOL_GPL(nft_unregister_flowtable_type);
5392 static const struct nla_policy nft_flowtable_policy[NFTA_FLOWTABLE_MAX + 1] = {
5393 [NFTA_FLOWTABLE_TABLE] = { .type = NLA_STRING,
5394 .len = NFT_NAME_MAXLEN - 1 },
5395 [NFTA_FLOWTABLE_NAME] = { .type = NLA_STRING,
5396 .len = NFT_NAME_MAXLEN - 1 },
5397 [NFTA_FLOWTABLE_HOOK] = { .type = NLA_NESTED },
5398 [NFTA_FLOWTABLE_HANDLE] = { .type = NLA_U64 },
5401 struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table,
5402 const struct nlattr *nla, u8 genmask)
5404 struct nft_flowtable *flowtable;
5406 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
5407 if (!nla_strcmp(nla, flowtable->name) &&
5408 nft_active_genmask(flowtable, genmask))
5411 return ERR_PTR(-ENOENT);
5413 EXPORT_SYMBOL_GPL(nft_flowtable_lookup);
5415 static struct nft_flowtable *
5416 nft_flowtable_lookup_byhandle(const struct nft_table *table,
5417 const struct nlattr *nla, u8 genmask)
5419 struct nft_flowtable *flowtable;
5421 list_for_each_entry(flowtable, &table->flowtables, list) {
5422 if (be64_to_cpu(nla_get_be64(nla)) == flowtable->handle &&
5423 nft_active_genmask(flowtable, genmask))
5426 return ERR_PTR(-ENOENT);
5429 static int nf_tables_parse_devices(const struct nft_ctx *ctx,
5430 const struct nlattr *attr,
5431 struct net_device *dev_array[], int *len)
5433 const struct nlattr *tmp;
5434 struct net_device *dev;
5435 char ifname[IFNAMSIZ];
5436 int rem, n = 0, err;
5438 nla_for_each_nested(tmp, attr, rem) {
5439 if (nla_type(tmp) != NFTA_DEVICE_NAME) {
5444 nla_strlcpy(ifname, tmp, IFNAMSIZ);
5445 dev = __dev_get_by_name(ctx->net, ifname);
5451 dev_array[n++] = dev;
5452 if (n == NFT_FLOWTABLE_DEVICE_MAX) {
5466 static const struct nla_policy nft_flowtable_hook_policy[NFTA_FLOWTABLE_HOOK_MAX + 1] = {
5467 [NFTA_FLOWTABLE_HOOK_NUM] = { .type = NLA_U32 },
5468 [NFTA_FLOWTABLE_HOOK_PRIORITY] = { .type = NLA_U32 },
5469 [NFTA_FLOWTABLE_HOOK_DEVS] = { .type = NLA_NESTED },
5472 static int nf_tables_flowtable_parse_hook(const struct nft_ctx *ctx,
5473 const struct nlattr *attr,
5474 struct nft_flowtable *flowtable)
5476 struct net_device *dev_array[NFT_FLOWTABLE_DEVICE_MAX];
5477 struct nlattr *tb[NFTA_FLOWTABLE_HOOK_MAX + 1];
5478 struct nf_hook_ops *ops;
5479 int hooknum, priority;
5482 err = nla_parse_nested(tb, NFTA_FLOWTABLE_HOOK_MAX, attr,
5483 nft_flowtable_hook_policy, NULL);
5487 if (!tb[NFTA_FLOWTABLE_HOOK_NUM] ||
5488 !tb[NFTA_FLOWTABLE_HOOK_PRIORITY] ||
5489 !tb[NFTA_FLOWTABLE_HOOK_DEVS])
5492 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
5493 if (hooknum != NF_NETDEV_INGRESS)
5496 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
5498 err = nf_tables_parse_devices(ctx, tb[NFTA_FLOWTABLE_HOOK_DEVS],
5503 ops = kcalloc(n, sizeof(struct nf_hook_ops), GFP_KERNEL);
5507 flowtable->hooknum = hooknum;
5508 flowtable->priority = priority;
5509 flowtable->ops = ops;
5510 flowtable->ops_len = n;
5512 for (i = 0; i < n; i++) {
5513 flowtable->ops[i].pf = NFPROTO_NETDEV;
5514 flowtable->ops[i].hooknum = hooknum;
5515 flowtable->ops[i].priority = priority;
5516 flowtable->ops[i].priv = &flowtable->data;
5517 flowtable->ops[i].hook = flowtable->data.type->hook;
5518 flowtable->ops[i].dev = dev_array[i];
5524 static const struct nf_flowtable_type *__nft_flowtable_type_get(u8 family)
5526 const struct nf_flowtable_type *type;
5528 list_for_each_entry(type, &nf_tables_flowtables, list) {
5529 if (family == type->family)
5535 static const struct nf_flowtable_type *
5536 nft_flowtable_type_get(struct net *net, u8 family)
5538 const struct nf_flowtable_type *type;
5540 type = __nft_flowtable_type_get(family);
5541 if (type != NULL && try_module_get(type->owner))
5544 lockdep_nfnl_nft_mutex_not_held();
5545 #ifdef CONFIG_MODULES
5547 nft_request_module(net, "nf-flowtable-%u", family);
5548 if (__nft_flowtable_type_get(family))
5549 return ERR_PTR(-EAGAIN);
5552 return ERR_PTR(-ENOENT);
5555 static void nft_unregister_flowtable_net_hooks(struct net *net,
5556 struct nft_flowtable *flowtable)
5560 for (i = 0; i < flowtable->ops_len; i++) {
5561 if (!flowtable->ops[i].dev)
5564 nf_unregister_net_hook(net, &flowtable->ops[i]);
5568 static int nf_tables_newflowtable(struct net *net, struct sock *nlsk,
5569 struct sk_buff *skb,
5570 const struct nlmsghdr *nlh,
5571 const struct nlattr * const nla[],
5572 struct netlink_ext_ack *extack)
5574 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
5575 const struct nf_flowtable_type *type;
5576 struct nft_flowtable *flowtable, *ft;
5577 u8 genmask = nft_genmask_next(net);
5578 int family = nfmsg->nfgen_family;
5579 struct nft_table *table;
5583 if (!nla[NFTA_FLOWTABLE_TABLE] ||
5584 !nla[NFTA_FLOWTABLE_NAME] ||
5585 !nla[NFTA_FLOWTABLE_HOOK])
5588 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
5590 if (IS_ERR(table)) {
5591 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
5592 return PTR_ERR(table);
5595 flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
5597 if (IS_ERR(flowtable)) {
5598 err = PTR_ERR(flowtable);
5599 if (err != -ENOENT) {
5600 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
5604 if (nlh->nlmsg_flags & NLM_F_EXCL) {
5605 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
5612 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
5614 flowtable = kzalloc(sizeof(*flowtable), GFP_KERNEL);
5618 flowtable->table = table;
5619 flowtable->handle = nf_tables_alloc_handle(table);
5621 flowtable->name = nla_strdup(nla[NFTA_FLOWTABLE_NAME], GFP_KERNEL);
5622 if (!flowtable->name) {
5627 type = nft_flowtable_type_get(net, family);
5629 err = PTR_ERR(type);
5633 flowtable->data.type = type;
5634 err = type->init(&flowtable->data);
5638 err = nf_tables_flowtable_parse_hook(&ctx, nla[NFTA_FLOWTABLE_HOOK],
5643 for (i = 0; i < flowtable->ops_len; i++) {
5644 if (!flowtable->ops[i].dev)
5647 list_for_each_entry(ft, &table->flowtables, list) {
5648 for (k = 0; k < ft->ops_len; k++) {
5649 if (!ft->ops[k].dev)
5652 if (flowtable->ops[i].dev == ft->ops[k].dev &&
5653 flowtable->ops[i].pf == ft->ops[k].pf) {
5660 err = nf_register_net_hook(net, &flowtable->ops[i]);
5665 err = nft_trans_flowtable_add(&ctx, NFT_MSG_NEWFLOWTABLE, flowtable);
5669 list_add_tail_rcu(&flowtable->list, &table->flowtables);
5674 i = flowtable->ops_len;
5676 for (k = i - 1; k >= 0; k--)
5677 nf_unregister_net_hook(net, &flowtable->ops[k]);
5679 kfree(flowtable->ops);
5681 flowtable->data.type->free(&flowtable->data);
5683 module_put(type->owner);
5685 kfree(flowtable->name);
5691 static int nf_tables_delflowtable(struct net *net, struct sock *nlsk,
5692 struct sk_buff *skb,
5693 const struct nlmsghdr *nlh,
5694 const struct nlattr * const nla[],
5695 struct netlink_ext_ack *extack)
5697 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
5698 u8 genmask = nft_genmask_next(net);
5699 int family = nfmsg->nfgen_family;
5700 struct nft_flowtable *flowtable;
5701 const struct nlattr *attr;
5702 struct nft_table *table;
5705 if (!nla[NFTA_FLOWTABLE_TABLE] ||
5706 (!nla[NFTA_FLOWTABLE_NAME] &&
5707 !nla[NFTA_FLOWTABLE_HANDLE]))
5710 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
5712 if (IS_ERR(table)) {
5713 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
5714 return PTR_ERR(table);
5717 if (nla[NFTA_FLOWTABLE_HANDLE]) {
5718 attr = nla[NFTA_FLOWTABLE_HANDLE];
5719 flowtable = nft_flowtable_lookup_byhandle(table, attr, genmask);
5721 attr = nla[NFTA_FLOWTABLE_NAME];
5722 flowtable = nft_flowtable_lookup(table, attr, genmask);
5725 if (IS_ERR(flowtable)) {
5726 NL_SET_BAD_ATTR(extack, attr);
5727 return PTR_ERR(flowtable);
5729 if (flowtable->use > 0) {
5730 NL_SET_BAD_ATTR(extack, attr);
5734 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
5736 return nft_delflowtable(&ctx, flowtable);
5739 static int nf_tables_fill_flowtable_info(struct sk_buff *skb, struct net *net,
5740 u32 portid, u32 seq, int event,
5741 u32 flags, int family,
5742 struct nft_flowtable *flowtable)
5744 struct nlattr *nest, *nest_devs;
5745 struct nfgenmsg *nfmsg;
5746 struct nlmsghdr *nlh;
5749 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
5750 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
5752 goto nla_put_failure;
5754 nfmsg = nlmsg_data(nlh);
5755 nfmsg->nfgen_family = family;
5756 nfmsg->version = NFNETLINK_V0;
5757 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
5759 if (nla_put_string(skb, NFTA_FLOWTABLE_TABLE, flowtable->table->name) ||
5760 nla_put_string(skb, NFTA_FLOWTABLE_NAME, flowtable->name) ||
5761 nla_put_be32(skb, NFTA_FLOWTABLE_USE, htonl(flowtable->use)) ||
5762 nla_put_be64(skb, NFTA_FLOWTABLE_HANDLE, cpu_to_be64(flowtable->handle),
5763 NFTA_FLOWTABLE_PAD))
5764 goto nla_put_failure;
5766 nest = nla_nest_start(skb, NFTA_FLOWTABLE_HOOK);
5768 goto nla_put_failure;
5769 if (nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_NUM, htonl(flowtable->hooknum)) ||
5770 nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_PRIORITY, htonl(flowtable->priority)))
5771 goto nla_put_failure;
5773 nest_devs = nla_nest_start(skb, NFTA_FLOWTABLE_HOOK_DEVS);
5775 goto nla_put_failure;
5777 for (i = 0; i < flowtable->ops_len; i++) {
5778 const struct net_device *dev = READ_ONCE(flowtable->ops[i].dev);
5781 nla_put_string(skb, NFTA_DEVICE_NAME, dev->name))
5782 goto nla_put_failure;
5784 nla_nest_end(skb, nest_devs);
5785 nla_nest_end(skb, nest);
5787 nlmsg_end(skb, nlh);
5791 nlmsg_trim(skb, nlh);
5795 struct nft_flowtable_filter {
5799 static int nf_tables_dump_flowtable(struct sk_buff *skb,
5800 struct netlink_callback *cb)
5802 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
5803 struct nft_flowtable_filter *filter = cb->data;
5804 unsigned int idx = 0, s_idx = cb->args[0];
5805 struct net *net = sock_net(skb->sk);
5806 int family = nfmsg->nfgen_family;
5807 struct nft_flowtable *flowtable;
5808 const struct nft_table *table;
5811 cb->seq = net->nft.base_seq;
5813 list_for_each_entry_rcu(table, &net->nft.tables, list) {
5814 if (family != NFPROTO_UNSPEC && family != table->family)
5817 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
5818 if (!nft_is_active(net, flowtable))
5823 memset(&cb->args[1], 0,
5824 sizeof(cb->args) - sizeof(cb->args[0]));
5825 if (filter && filter->table &&
5826 strcmp(filter->table, table->name))
5829 if (nf_tables_fill_flowtable_info(skb, net, NETLINK_CB(cb->skb).portid,
5831 NFT_MSG_NEWFLOWTABLE,
5832 NLM_F_MULTI | NLM_F_APPEND,
5833 table->family, flowtable) < 0)
5836 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
5848 static int nf_tables_dump_flowtable_start(struct netlink_callback *cb)
5850 const struct nlattr * const *nla = cb->data;
5851 struct nft_flowtable_filter *filter = NULL;
5853 if (nla[NFTA_FLOWTABLE_TABLE]) {
5854 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
5858 filter->table = nla_strdup(nla[NFTA_FLOWTABLE_TABLE],
5860 if (!filter->table) {
5870 static int nf_tables_dump_flowtable_done(struct netlink_callback *cb)
5872 struct nft_flowtable_filter *filter = cb->data;
5877 kfree(filter->table);
5883 /* called with rcu_read_lock held */
5884 static int nf_tables_getflowtable(struct net *net, struct sock *nlsk,
5885 struct sk_buff *skb,
5886 const struct nlmsghdr *nlh,
5887 const struct nlattr * const nla[],
5888 struct netlink_ext_ack *extack)
5890 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
5891 u8 genmask = nft_genmask_cur(net);
5892 int family = nfmsg->nfgen_family;
5893 struct nft_flowtable *flowtable;
5894 const struct nft_table *table;
5895 struct sk_buff *skb2;
5898 if (nlh->nlmsg_flags & NLM_F_DUMP) {
5899 struct netlink_dump_control c = {
5900 .start = nf_tables_dump_flowtable_start,
5901 .dump = nf_tables_dump_flowtable,
5902 .done = nf_tables_dump_flowtable_done,
5903 .module = THIS_MODULE,
5904 .data = (void *)nla,
5907 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
5910 if (!nla[NFTA_FLOWTABLE_NAME])
5913 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
5916 return PTR_ERR(table);
5918 flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
5920 if (IS_ERR(flowtable))
5921 return PTR_ERR(flowtable);
5923 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
5927 err = nf_tables_fill_flowtable_info(skb2, net, NETLINK_CB(skb).portid,
5929 NFT_MSG_NEWFLOWTABLE, 0, family,
5932 goto err_fill_flowtable_info;
5934 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
5936 err_fill_flowtable_info:
5941 static void nf_tables_flowtable_notify(struct nft_ctx *ctx,
5942 struct nft_flowtable *flowtable,
5945 struct sk_buff *skb;
5949 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
5952 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
5956 err = nf_tables_fill_flowtable_info(skb, ctx->net, ctx->portid,
5958 ctx->family, flowtable);
5964 nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
5965 ctx->report, GFP_KERNEL);
5968 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
5971 static void nf_tables_flowtable_destroy(struct nft_flowtable *flowtable)
5973 kfree(flowtable->ops);
5974 kfree(flowtable->name);
5975 flowtable->data.type->free(&flowtable->data);
5976 module_put(flowtable->data.type->owner);
5980 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
5981 u32 portid, u32 seq)
5983 struct nlmsghdr *nlh;
5984 struct nfgenmsg *nfmsg;
5985 char buf[TASK_COMM_LEN];
5986 int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN);
5988 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), 0);
5990 goto nla_put_failure;
5992 nfmsg = nlmsg_data(nlh);
5993 nfmsg->nfgen_family = AF_UNSPEC;
5994 nfmsg->version = NFNETLINK_V0;
5995 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
5997 if (nla_put_be32(skb, NFTA_GEN_ID, htonl(net->nft.base_seq)) ||
5998 nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) ||
5999 nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current)))
6000 goto nla_put_failure;
6002 nlmsg_end(skb, nlh);
6006 nlmsg_trim(skb, nlh);
6010 static void nft_flowtable_event(unsigned long event, struct net_device *dev,
6011 struct nft_flowtable *flowtable)
6015 for (i = 0; i < flowtable->ops_len; i++) {
6016 if (flowtable->ops[i].dev != dev)
6019 nf_unregister_net_hook(dev_net(dev), &flowtable->ops[i]);
6020 flowtable->ops[i].dev = NULL;
6025 static int nf_tables_flowtable_event(struct notifier_block *this,
6026 unsigned long event, void *ptr)
6028 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
6029 struct nft_flowtable *flowtable;
6030 struct nft_table *table;
6033 if (event != NETDEV_UNREGISTER)
6037 mutex_lock(&net->nft.commit_mutex);
6038 list_for_each_entry(table, &net->nft.tables, list) {
6039 list_for_each_entry(flowtable, &table->flowtables, list) {
6040 nft_flowtable_event(event, dev, flowtable);
6043 mutex_unlock(&net->nft.commit_mutex);
6048 static struct notifier_block nf_tables_flowtable_notifier = {
6049 .notifier_call = nf_tables_flowtable_event,
6052 static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
6055 struct nlmsghdr *nlh = nlmsg_hdr(skb);
6056 struct sk_buff *skb2;
6059 if (nlmsg_report(nlh) &&
6060 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
6063 skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
6067 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
6074 nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
6075 nlmsg_report(nlh), GFP_KERNEL);
6078 nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
6082 static int nf_tables_getgen(struct net *net, struct sock *nlsk,
6083 struct sk_buff *skb, const struct nlmsghdr *nlh,
6084 const struct nlattr * const nla[],
6085 struct netlink_ext_ack *extack)
6087 struct sk_buff *skb2;
6090 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
6094 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
6097 goto err_fill_gen_info;
6099 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
6106 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
6107 [NFT_MSG_NEWTABLE] = {
6108 .call_batch = nf_tables_newtable,
6109 .attr_count = NFTA_TABLE_MAX,
6110 .policy = nft_table_policy,
6112 [NFT_MSG_GETTABLE] = {
6113 .call_rcu = nf_tables_gettable,
6114 .attr_count = NFTA_TABLE_MAX,
6115 .policy = nft_table_policy,
6117 [NFT_MSG_DELTABLE] = {
6118 .call_batch = nf_tables_deltable,
6119 .attr_count = NFTA_TABLE_MAX,
6120 .policy = nft_table_policy,
6122 [NFT_MSG_NEWCHAIN] = {
6123 .call_batch = nf_tables_newchain,
6124 .attr_count = NFTA_CHAIN_MAX,
6125 .policy = nft_chain_policy,
6127 [NFT_MSG_GETCHAIN] = {
6128 .call_rcu = nf_tables_getchain,
6129 .attr_count = NFTA_CHAIN_MAX,
6130 .policy = nft_chain_policy,
6132 [NFT_MSG_DELCHAIN] = {
6133 .call_batch = nf_tables_delchain,
6134 .attr_count = NFTA_CHAIN_MAX,
6135 .policy = nft_chain_policy,
6137 [NFT_MSG_NEWRULE] = {
6138 .call_batch = nf_tables_newrule,
6139 .attr_count = NFTA_RULE_MAX,
6140 .policy = nft_rule_policy,
6142 [NFT_MSG_GETRULE] = {
6143 .call_rcu = nf_tables_getrule,
6144 .attr_count = NFTA_RULE_MAX,
6145 .policy = nft_rule_policy,
6147 [NFT_MSG_DELRULE] = {
6148 .call_batch = nf_tables_delrule,
6149 .attr_count = NFTA_RULE_MAX,
6150 .policy = nft_rule_policy,
6152 [NFT_MSG_NEWSET] = {
6153 .call_batch = nf_tables_newset,
6154 .attr_count = NFTA_SET_MAX,
6155 .policy = nft_set_policy,
6157 [NFT_MSG_GETSET] = {
6158 .call_rcu = nf_tables_getset,
6159 .attr_count = NFTA_SET_MAX,
6160 .policy = nft_set_policy,
6162 [NFT_MSG_DELSET] = {
6163 .call_batch = nf_tables_delset,
6164 .attr_count = NFTA_SET_MAX,
6165 .policy = nft_set_policy,
6167 [NFT_MSG_NEWSETELEM] = {
6168 .call_batch = nf_tables_newsetelem,
6169 .attr_count = NFTA_SET_ELEM_LIST_MAX,
6170 .policy = nft_set_elem_list_policy,
6172 [NFT_MSG_GETSETELEM] = {
6173 .call_rcu = nf_tables_getsetelem,
6174 .attr_count = NFTA_SET_ELEM_LIST_MAX,
6175 .policy = nft_set_elem_list_policy,
6177 [NFT_MSG_DELSETELEM] = {
6178 .call_batch = nf_tables_delsetelem,
6179 .attr_count = NFTA_SET_ELEM_LIST_MAX,
6180 .policy = nft_set_elem_list_policy,
6182 [NFT_MSG_GETGEN] = {
6183 .call_rcu = nf_tables_getgen,
6185 [NFT_MSG_NEWOBJ] = {
6186 .call_batch = nf_tables_newobj,
6187 .attr_count = NFTA_OBJ_MAX,
6188 .policy = nft_obj_policy,
6190 [NFT_MSG_GETOBJ] = {
6191 .call_rcu = nf_tables_getobj,
6192 .attr_count = NFTA_OBJ_MAX,
6193 .policy = nft_obj_policy,
6195 [NFT_MSG_DELOBJ] = {
6196 .call_batch = nf_tables_delobj,
6197 .attr_count = NFTA_OBJ_MAX,
6198 .policy = nft_obj_policy,
6200 [NFT_MSG_GETOBJ_RESET] = {
6201 .call_rcu = nf_tables_getobj,
6202 .attr_count = NFTA_OBJ_MAX,
6203 .policy = nft_obj_policy,
6205 [NFT_MSG_NEWFLOWTABLE] = {
6206 .call_batch = nf_tables_newflowtable,
6207 .attr_count = NFTA_FLOWTABLE_MAX,
6208 .policy = nft_flowtable_policy,
6210 [NFT_MSG_GETFLOWTABLE] = {
6211 .call_rcu = nf_tables_getflowtable,
6212 .attr_count = NFTA_FLOWTABLE_MAX,
6213 .policy = nft_flowtable_policy,
6215 [NFT_MSG_DELFLOWTABLE] = {
6216 .call_batch = nf_tables_delflowtable,
6217 .attr_count = NFTA_FLOWTABLE_MAX,
6218 .policy = nft_flowtable_policy,
6222 static int nf_tables_validate(struct net *net)
6224 struct nft_table *table;
6226 switch (net->nft.validate_state) {
6227 case NFT_VALIDATE_SKIP:
6229 case NFT_VALIDATE_NEED:
6230 nft_validate_state_update(net, NFT_VALIDATE_DO);
6232 case NFT_VALIDATE_DO:
6233 list_for_each_entry(table, &net->nft.tables, list) {
6234 if (nft_table_validate(net, table) < 0)
6243 static void nft_chain_commit_update(struct nft_trans *trans)
6245 struct nft_base_chain *basechain;
6247 if (nft_trans_chain_name(trans)) {
6248 rhltable_remove(&trans->ctx.table->chains_ht,
6249 &trans->ctx.chain->rhlhead,
6250 nft_chain_ht_params);
6251 swap(trans->ctx.chain->name, nft_trans_chain_name(trans));
6252 rhltable_insert_key(&trans->ctx.table->chains_ht,
6253 trans->ctx.chain->name,
6254 &trans->ctx.chain->rhlhead,
6255 nft_chain_ht_params);
6258 if (!nft_is_base_chain(trans->ctx.chain))
6261 basechain = nft_base_chain(trans->ctx.chain);
6262 nft_chain_stats_replace(trans->ctx.net, basechain,
6263 nft_trans_chain_stats(trans));
6265 switch (nft_trans_chain_policy(trans)) {
6268 basechain->policy = nft_trans_chain_policy(trans);
6273 static void nft_commit_release(struct nft_trans *trans)
6275 switch (trans->msg_type) {
6276 case NFT_MSG_DELTABLE:
6277 nf_tables_table_destroy(&trans->ctx);
6279 case NFT_MSG_NEWCHAIN:
6280 kfree(nft_trans_chain_name(trans));
6282 case NFT_MSG_DELCHAIN:
6283 nf_tables_chain_destroy(&trans->ctx);
6285 case NFT_MSG_DELRULE:
6286 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
6288 case NFT_MSG_DELSET:
6289 nft_set_destroy(nft_trans_set(trans));
6291 case NFT_MSG_DELSETELEM:
6292 nf_tables_set_elem_destroy(&trans->ctx,
6293 nft_trans_elem_set(trans),
6294 nft_trans_elem(trans).priv);
6296 case NFT_MSG_DELOBJ:
6297 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
6299 case NFT_MSG_DELFLOWTABLE:
6300 nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
6306 static void nf_tables_commit_release(struct net *net)
6308 struct nft_trans *trans, *next;
6310 if (list_empty(&net->nft.commit_list))
6315 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
6316 list_del(&trans->list);
6317 nft_commit_release(trans);
6321 static int nf_tables_commit_chain_prepare(struct net *net, struct nft_chain *chain)
6323 struct nft_rule *rule;
6324 unsigned int alloc = 0;
6327 /* already handled or inactive chain? */
6328 if (chain->rules_next || !nft_is_active_next(net, chain))
6331 rule = list_entry(&chain->rules, struct nft_rule, list);
6334 list_for_each_entry_continue(rule, &chain->rules, list) {
6335 if (nft_is_active_next(net, rule))
6339 chain->rules_next = nf_tables_chain_alloc_rules(chain, alloc);
6340 if (!chain->rules_next)
6343 list_for_each_entry_continue(rule, &chain->rules, list) {
6344 if (nft_is_active_next(net, rule))
6345 chain->rules_next[i++] = rule;
6348 chain->rules_next[i] = NULL;
6352 static void nf_tables_commit_chain_prepare_cancel(struct net *net)
6354 struct nft_trans *trans, *next;
6356 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
6357 struct nft_chain *chain = trans->ctx.chain;
6359 if (trans->msg_type == NFT_MSG_NEWRULE ||
6360 trans->msg_type == NFT_MSG_DELRULE) {
6361 kvfree(chain->rules_next);
6362 chain->rules_next = NULL;
6367 static void __nf_tables_commit_chain_free_rules_old(struct rcu_head *h)
6369 struct nft_rules_old *o = container_of(h, struct nft_rules_old, h);
6374 static void nf_tables_commit_chain_free_rules_old(struct nft_rule **rules)
6376 struct nft_rule **r = rules;
6377 struct nft_rules_old *old;
6382 r++; /* rcu_head is after end marker */
6386 call_rcu(&old->h, __nf_tables_commit_chain_free_rules_old);
6389 static void nf_tables_commit_chain(struct net *net, struct nft_chain *chain)
6391 struct nft_rule **g0, **g1;
6394 next_genbit = nft_gencursor_next(net);
6396 g0 = rcu_dereference_protected(chain->rules_gen_0,
6397 lockdep_commit_lock_is_held(net));
6398 g1 = rcu_dereference_protected(chain->rules_gen_1,
6399 lockdep_commit_lock_is_held(net));
6401 /* No changes to this chain? */
6402 if (chain->rules_next == NULL) {
6403 /* chain had no change in last or next generation */
6407 * chain had no change in this generation; make sure next
6408 * one uses same rules as current generation.
6411 rcu_assign_pointer(chain->rules_gen_1, g0);
6412 nf_tables_commit_chain_free_rules_old(g1);
6414 rcu_assign_pointer(chain->rules_gen_0, g1);
6415 nf_tables_commit_chain_free_rules_old(g0);
6422 rcu_assign_pointer(chain->rules_gen_1, chain->rules_next);
6424 rcu_assign_pointer(chain->rules_gen_0, chain->rules_next);
6426 chain->rules_next = NULL;
6432 nf_tables_commit_chain_free_rules_old(g1);
6434 nf_tables_commit_chain_free_rules_old(g0);
6437 static void nft_chain_del(struct nft_chain *chain)
6439 struct nft_table *table = chain->table;
6441 WARN_ON_ONCE(rhltable_remove(&table->chains_ht, &chain->rhlhead,
6442 nft_chain_ht_params));
6443 list_del_rcu(&chain->list);
6446 static int nf_tables_commit(struct net *net, struct sk_buff *skb)
6448 struct nft_trans *trans, *next;
6449 struct nft_trans_elem *te;
6450 struct nft_chain *chain;
6451 struct nft_table *table;
6453 /* 0. Validate ruleset, otherwise roll back for error reporting. */
6454 if (nf_tables_validate(net) < 0)
6457 /* 1. Allocate space for next generation rules_gen_X[] */
6458 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
6461 if (trans->msg_type == NFT_MSG_NEWRULE ||
6462 trans->msg_type == NFT_MSG_DELRULE) {
6463 chain = trans->ctx.chain;
6465 ret = nf_tables_commit_chain_prepare(net, chain);
6467 nf_tables_commit_chain_prepare_cancel(net);
6473 /* step 2. Make rules_gen_X visible to packet path */
6474 list_for_each_entry(table, &net->nft.tables, list) {
6475 list_for_each_entry(chain, &table->chains, list)
6476 nf_tables_commit_chain(net, chain);
6480 * Bump generation counter, invalidate any dump in progress.
6481 * Cannot fail after this point.
6483 while (++net->nft.base_seq == 0);
6485 /* step 3. Start new generation, rules_gen_X now in use. */
6486 net->nft.gencursor = nft_gencursor_next(net);
6488 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
6489 switch (trans->msg_type) {
6490 case NFT_MSG_NEWTABLE:
6491 if (nft_trans_table_update(trans)) {
6492 if (!nft_trans_table_enable(trans)) {
6493 nf_tables_table_disable(net,
6495 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
6498 nft_clear(net, trans->ctx.table);
6500 nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
6501 nft_trans_destroy(trans);
6503 case NFT_MSG_DELTABLE:
6504 list_del_rcu(&trans->ctx.table->list);
6505 nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE);
6507 case NFT_MSG_NEWCHAIN:
6508 if (nft_trans_chain_update(trans)) {
6509 nft_chain_commit_update(trans);
6510 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
6511 /* trans destroyed after rcu grace period */
6513 nft_clear(net, trans->ctx.chain);
6514 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
6515 nft_trans_destroy(trans);
6518 case NFT_MSG_DELCHAIN:
6519 nft_chain_del(trans->ctx.chain);
6520 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN);
6521 nf_tables_unregister_hook(trans->ctx.net,
6525 case NFT_MSG_NEWRULE:
6526 nft_clear(trans->ctx.net, nft_trans_rule(trans));
6527 nf_tables_rule_notify(&trans->ctx,
6528 nft_trans_rule(trans),
6530 nft_trans_destroy(trans);
6532 case NFT_MSG_DELRULE:
6533 list_del_rcu(&nft_trans_rule(trans)->list);
6534 nf_tables_rule_notify(&trans->ctx,
6535 nft_trans_rule(trans),
6537 nft_rule_expr_deactivate(&trans->ctx,
6538 nft_trans_rule(trans),
6541 case NFT_MSG_NEWSET:
6542 nft_clear(net, nft_trans_set(trans));
6543 /* This avoids hitting -EBUSY when deleting the table
6544 * from the transaction.
6546 if (nft_set_is_anonymous(nft_trans_set(trans)) &&
6547 !list_empty(&nft_trans_set(trans)->bindings))
6548 trans->ctx.table->use--;
6550 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
6551 NFT_MSG_NEWSET, GFP_KERNEL);
6552 nft_trans_destroy(trans);
6554 case NFT_MSG_DELSET:
6555 list_del_rcu(&nft_trans_set(trans)->list);
6556 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
6557 NFT_MSG_DELSET, GFP_KERNEL);
6559 case NFT_MSG_NEWSETELEM:
6560 te = (struct nft_trans_elem *)trans->data;
6562 te->set->ops->activate(net, te->set, &te->elem);
6563 nf_tables_setelem_notify(&trans->ctx, te->set,
6565 NFT_MSG_NEWSETELEM, 0);
6566 nft_trans_destroy(trans);
6568 case NFT_MSG_DELSETELEM:
6569 te = (struct nft_trans_elem *)trans->data;
6571 nf_tables_setelem_notify(&trans->ctx, te->set,
6573 NFT_MSG_DELSETELEM, 0);
6574 te->set->ops->remove(net, te->set, &te->elem);
6575 atomic_dec(&te->set->nelems);
6578 case NFT_MSG_NEWOBJ:
6579 nft_clear(net, nft_trans_obj(trans));
6580 nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
6582 nft_trans_destroy(trans);
6584 case NFT_MSG_DELOBJ:
6585 list_del_rcu(&nft_trans_obj(trans)->list);
6586 nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
6589 case NFT_MSG_NEWFLOWTABLE:
6590 nft_clear(net, nft_trans_flowtable(trans));
6591 nf_tables_flowtable_notify(&trans->ctx,
6592 nft_trans_flowtable(trans),
6593 NFT_MSG_NEWFLOWTABLE);
6594 nft_trans_destroy(trans);
6596 case NFT_MSG_DELFLOWTABLE:
6597 list_del_rcu(&nft_trans_flowtable(trans)->list);
6598 nf_tables_flowtable_notify(&trans->ctx,
6599 nft_trans_flowtable(trans),
6600 NFT_MSG_DELFLOWTABLE);
6601 nft_unregister_flowtable_net_hooks(net,
6602 nft_trans_flowtable(trans));
6607 nf_tables_commit_release(net);
6608 nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
6609 mutex_unlock(&net->nft.commit_mutex);
6614 static void nf_tables_abort_release(struct nft_trans *trans)
6616 switch (trans->msg_type) {
6617 case NFT_MSG_NEWTABLE:
6618 nf_tables_table_destroy(&trans->ctx);
6620 case NFT_MSG_NEWCHAIN:
6621 nf_tables_chain_destroy(&trans->ctx);
6623 case NFT_MSG_NEWRULE:
6624 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
6626 case NFT_MSG_NEWSET:
6627 nft_set_destroy(nft_trans_set(trans));
6629 case NFT_MSG_NEWSETELEM:
6630 nft_set_elem_destroy(nft_trans_elem_set(trans),
6631 nft_trans_elem(trans).priv, true);
6633 case NFT_MSG_NEWOBJ:
6634 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
6636 case NFT_MSG_NEWFLOWTABLE:
6637 nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
6643 static int __nf_tables_abort(struct net *net)
6645 struct nft_trans *trans, *next;
6646 struct nft_trans_elem *te;
6648 list_for_each_entry_safe_reverse(trans, next, &net->nft.commit_list,
6650 switch (trans->msg_type) {
6651 case NFT_MSG_NEWTABLE:
6652 if (nft_trans_table_update(trans)) {
6653 if (nft_trans_table_enable(trans)) {
6654 nf_tables_table_disable(net,
6656 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
6658 nft_trans_destroy(trans);
6660 list_del_rcu(&trans->ctx.table->list);
6663 case NFT_MSG_DELTABLE:
6664 nft_clear(trans->ctx.net, trans->ctx.table);
6665 nft_trans_destroy(trans);
6667 case NFT_MSG_NEWCHAIN:
6668 if (nft_trans_chain_update(trans)) {
6669 free_percpu(nft_trans_chain_stats(trans));
6670 kfree(nft_trans_chain_name(trans));
6671 nft_trans_destroy(trans);
6673 trans->ctx.table->use--;
6674 nft_chain_del(trans->ctx.chain);
6675 nf_tables_unregister_hook(trans->ctx.net,
6680 case NFT_MSG_DELCHAIN:
6681 trans->ctx.table->use++;
6682 nft_clear(trans->ctx.net, trans->ctx.chain);
6683 nft_trans_destroy(trans);
6685 case NFT_MSG_NEWRULE:
6686 trans->ctx.chain->use--;
6687 list_del_rcu(&nft_trans_rule(trans)->list);
6688 nft_rule_expr_deactivate(&trans->ctx,
6689 nft_trans_rule(trans),
6692 case NFT_MSG_DELRULE:
6693 trans->ctx.chain->use++;
6694 nft_clear(trans->ctx.net, nft_trans_rule(trans));
6695 nft_rule_expr_activate(&trans->ctx, nft_trans_rule(trans));
6696 nft_trans_destroy(trans);
6698 case NFT_MSG_NEWSET:
6699 trans->ctx.table->use--;
6700 if (nft_trans_set_bound(trans)) {
6701 nft_trans_destroy(trans);
6704 list_del_rcu(&nft_trans_set(trans)->list);
6706 case NFT_MSG_DELSET:
6707 trans->ctx.table->use++;
6708 nft_clear(trans->ctx.net, nft_trans_set(trans));
6709 nft_trans_destroy(trans);
6711 case NFT_MSG_NEWSETELEM:
6712 if (nft_trans_elem_set_bound(trans)) {
6713 nft_trans_destroy(trans);
6716 te = (struct nft_trans_elem *)trans->data;
6717 te->set->ops->remove(net, te->set, &te->elem);
6718 atomic_dec(&te->set->nelems);
6720 case NFT_MSG_DELSETELEM:
6721 te = (struct nft_trans_elem *)trans->data;
6723 nft_set_elem_activate(net, te->set, &te->elem);
6724 te->set->ops->activate(net, te->set, &te->elem);
6727 nft_trans_destroy(trans);
6729 case NFT_MSG_NEWOBJ:
6730 trans->ctx.table->use--;
6731 list_del_rcu(&nft_trans_obj(trans)->list);
6733 case NFT_MSG_DELOBJ:
6734 trans->ctx.table->use++;
6735 nft_clear(trans->ctx.net, nft_trans_obj(trans));
6736 nft_trans_destroy(trans);
6738 case NFT_MSG_NEWFLOWTABLE:
6739 trans->ctx.table->use--;
6740 list_del_rcu(&nft_trans_flowtable(trans)->list);
6741 nft_unregister_flowtable_net_hooks(net,
6742 nft_trans_flowtable(trans));
6744 case NFT_MSG_DELFLOWTABLE:
6745 trans->ctx.table->use++;
6746 nft_clear(trans->ctx.net, nft_trans_flowtable(trans));
6747 nft_trans_destroy(trans);
6754 list_for_each_entry_safe_reverse(trans, next,
6755 &net->nft.commit_list, list) {
6756 list_del(&trans->list);
6757 nf_tables_abort_release(trans);
6763 static void nf_tables_cleanup(struct net *net)
6765 nft_validate_state_update(net, NFT_VALIDATE_SKIP);
6768 static int nf_tables_abort(struct net *net, struct sk_buff *skb)
6770 int ret = __nf_tables_abort(net);
6772 mutex_unlock(&net->nft.commit_mutex);
6777 static bool nf_tables_valid_genid(struct net *net, u32 genid)
6781 mutex_lock(&net->nft.commit_mutex);
6783 genid_ok = genid == 0 || net->nft.base_seq == genid;
6785 mutex_unlock(&net->nft.commit_mutex);
6787 /* else, commit mutex has to be released by commit or abort function */
6791 static const struct nfnetlink_subsystem nf_tables_subsys = {
6792 .name = "nf_tables",
6793 .subsys_id = NFNL_SUBSYS_NFTABLES,
6794 .cb_count = NFT_MSG_MAX,
6796 .commit = nf_tables_commit,
6797 .abort = nf_tables_abort,
6798 .cleanup = nf_tables_cleanup,
6799 .valid_genid = nf_tables_valid_genid,
6800 .owner = THIS_MODULE,
6803 int nft_chain_validate_dependency(const struct nft_chain *chain,
6804 enum nft_chain_types type)
6806 const struct nft_base_chain *basechain;
6808 if (nft_is_base_chain(chain)) {
6809 basechain = nft_base_chain(chain);
6810 if (basechain->type->type != type)
6815 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
6817 int nft_chain_validate_hooks(const struct nft_chain *chain,
6818 unsigned int hook_flags)
6820 struct nft_base_chain *basechain;
6822 if (nft_is_base_chain(chain)) {
6823 basechain = nft_base_chain(chain);
6825 if ((1 << basechain->ops.hooknum) & hook_flags)
6833 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
6836 * Loop detection - walk through the ruleset beginning at the destination chain
6837 * of a new jump until either the source chain is reached (loop) or all
6838 * reachable chains have been traversed.
6840 * The loop check is performed whenever a new jump verdict is added to an
6841 * expression or verdict map or a verdict map is bound to a new chain.
6844 static int nf_tables_check_loops(const struct nft_ctx *ctx,
6845 const struct nft_chain *chain);
6847 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
6848 struct nft_set *set,
6849 const struct nft_set_iter *iter,
6850 struct nft_set_elem *elem)
6852 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6853 const struct nft_data *data;
6855 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
6856 *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
6859 data = nft_set_ext_data(ext);
6860 switch (data->verdict.code) {
6863 return nf_tables_check_loops(ctx, data->verdict.chain);
6869 static int nf_tables_check_loops(const struct nft_ctx *ctx,
6870 const struct nft_chain *chain)
6872 const struct nft_rule *rule;
6873 const struct nft_expr *expr, *last;
6874 struct nft_set *set;
6875 struct nft_set_binding *binding;
6876 struct nft_set_iter iter;
6878 if (ctx->chain == chain)
6881 list_for_each_entry(rule, &chain->rules, list) {
6882 nft_rule_for_each_expr(expr, last, rule) {
6883 struct nft_immediate_expr *priv;
6884 const struct nft_data *data;
6887 if (strcmp(expr->ops->type->name, "immediate"))
6890 priv = nft_expr_priv(expr);
6891 if (priv->dreg != NFT_REG_VERDICT)
6895 switch (data->verdict.code) {
6898 err = nf_tables_check_loops(ctx,
6899 data->verdict.chain);
6908 list_for_each_entry(set, &ctx->table->sets, list) {
6909 if (!nft_is_active_next(ctx->net, set))
6911 if (!(set->flags & NFT_SET_MAP) ||
6912 set->dtype != NFT_DATA_VERDICT)
6915 list_for_each_entry(binding, &set->bindings, list) {
6916 if (!(binding->flags & NFT_SET_MAP) ||
6917 binding->chain != chain)
6920 iter.genmask = nft_genmask_next(ctx->net);
6924 iter.fn = nf_tables_loop_check_setelem;
6926 set->ops->walk(ctx, set, &iter);
6936 * nft_parse_u32_check - fetch u32 attribute and check for maximum value
6938 * @attr: netlink attribute to fetch value from
6939 * @max: maximum value to be stored in dest
6940 * @dest: pointer to the variable
6942 * Parse, check and store a given u32 netlink attribute into variable.
6943 * This function returns -ERANGE if the value goes over maximum value.
6944 * Otherwise a 0 is returned and the attribute value is stored in the
6945 * destination variable.
6947 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
6951 val = ntohl(nla_get_be32(attr));
6958 EXPORT_SYMBOL_GPL(nft_parse_u32_check);
6961 * nft_parse_register - parse a register value from a netlink attribute
6963 * @attr: netlink attribute
6965 * Parse and translate a register value from a netlink attribute.
6966 * Registers used to be 128 bit wide, these register numbers will be
6967 * mapped to the corresponding 32 bit register numbers.
6969 unsigned int nft_parse_register(const struct nlattr *attr)
6973 reg = ntohl(nla_get_be32(attr));
6975 case NFT_REG_VERDICT...NFT_REG_4:
6976 return reg * NFT_REG_SIZE / NFT_REG32_SIZE;
6978 return reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
6981 EXPORT_SYMBOL_GPL(nft_parse_register);
6984 * nft_dump_register - dump a register value to a netlink attribute
6986 * @skb: socket buffer
6987 * @attr: attribute number
6988 * @reg: register number
6990 * Construct a netlink attribute containing the register number. For
6991 * compatibility reasons, register numbers being a multiple of 4 are
6992 * translated to the corresponding 128 bit register numbers.
6994 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
6996 if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
6997 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
6999 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
7001 return nla_put_be32(skb, attr, htonl(reg));
7003 EXPORT_SYMBOL_GPL(nft_dump_register);
7006 * nft_validate_register_load - validate a load from a register
7008 * @reg: the register number
7009 * @len: the length of the data
7011 * Validate that the input register is one of the general purpose
7012 * registers and that the length of the load is within the bounds.
7014 int nft_validate_register_load(enum nft_registers reg, unsigned int len)
7016 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
7020 if (reg * NFT_REG32_SIZE + len > FIELD_SIZEOF(struct nft_regs, data))
7025 EXPORT_SYMBOL_GPL(nft_validate_register_load);
7028 * nft_validate_register_store - validate an expressions' register store
7030 * @ctx: context of the expression performing the load
7031 * @reg: the destination register number
7032 * @data: the data to load
7033 * @type: the data type
7034 * @len: the length of the data
7036 * Validate that a data load uses the appropriate data type for
7037 * the destination register and the length is within the bounds.
7038 * A value of NULL for the data means that its runtime gathered
7041 int nft_validate_register_store(const struct nft_ctx *ctx,
7042 enum nft_registers reg,
7043 const struct nft_data *data,
7044 enum nft_data_types type, unsigned int len)
7049 case NFT_REG_VERDICT:
7050 if (type != NFT_DATA_VERDICT)
7054 (data->verdict.code == NFT_GOTO ||
7055 data->verdict.code == NFT_JUMP)) {
7056 err = nf_tables_check_loops(ctx, data->verdict.chain);
7063 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
7067 if (reg * NFT_REG32_SIZE + len >
7068 FIELD_SIZEOF(struct nft_regs, data))
7071 if (data != NULL && type != NFT_DATA_VALUE)
7076 EXPORT_SYMBOL_GPL(nft_validate_register_store);
7078 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
7079 [NFTA_VERDICT_CODE] = { .type = NLA_U32 },
7080 [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING,
7081 .len = NFT_CHAIN_MAXNAMELEN - 1 },
7084 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
7085 struct nft_data_desc *desc, const struct nlattr *nla)
7087 u8 genmask = nft_genmask_next(ctx->net);
7088 struct nlattr *tb[NFTA_VERDICT_MAX + 1];
7089 struct nft_chain *chain;
7092 err = nla_parse_nested(tb, NFTA_VERDICT_MAX, nla, nft_verdict_policy,
7097 if (!tb[NFTA_VERDICT_CODE])
7099 data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
7101 switch (data->verdict.code) {
7103 switch (data->verdict.code & NF_VERDICT_MASK) {
7118 if (!tb[NFTA_VERDICT_CHAIN])
7120 chain = nft_chain_lookup(ctx->net, ctx->table,
7121 tb[NFTA_VERDICT_CHAIN], genmask);
7123 return PTR_ERR(chain);
7124 if (nft_is_base_chain(chain))
7128 data->verdict.chain = chain;
7132 desc->len = sizeof(data->verdict);
7133 desc->type = NFT_DATA_VERDICT;
7137 static void nft_verdict_uninit(const struct nft_data *data)
7139 switch (data->verdict.code) {
7142 data->verdict.chain->use--;
7147 int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
7149 struct nlattr *nest;
7151 nest = nla_nest_start(skb, type);
7153 goto nla_put_failure;
7155 if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
7156 goto nla_put_failure;
7161 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
7163 goto nla_put_failure;
7165 nla_nest_end(skb, nest);
7172 static int nft_value_init(const struct nft_ctx *ctx,
7173 struct nft_data *data, unsigned int size,
7174 struct nft_data_desc *desc, const struct nlattr *nla)
7184 nla_memcpy(data->data, nla, len);
7185 desc->type = NFT_DATA_VALUE;
7190 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
7193 return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
7196 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
7197 [NFTA_DATA_VALUE] = { .type = NLA_BINARY },
7198 [NFTA_DATA_VERDICT] = { .type = NLA_NESTED },
7202 * nft_data_init - parse nf_tables data netlink attributes
7204 * @ctx: context of the expression using the data
7205 * @data: destination struct nft_data
7206 * @size: maximum data length
7207 * @desc: data description
7208 * @nla: netlink attribute containing data
7210 * Parse the netlink data attributes and initialize a struct nft_data.
7211 * The type and length of data are returned in the data description.
7213 * The caller can indicate that it only wants to accept data of type
7214 * NFT_DATA_VALUE by passing NULL for the ctx argument.
7216 int nft_data_init(const struct nft_ctx *ctx,
7217 struct nft_data *data, unsigned int size,
7218 struct nft_data_desc *desc, const struct nlattr *nla)
7220 struct nlattr *tb[NFTA_DATA_MAX + 1];
7223 err = nla_parse_nested(tb, NFTA_DATA_MAX, nla, nft_data_policy, NULL);
7227 if (tb[NFTA_DATA_VALUE])
7228 return nft_value_init(ctx, data, size, desc,
7229 tb[NFTA_DATA_VALUE]);
7230 if (tb[NFTA_DATA_VERDICT] && ctx != NULL)
7231 return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
7234 EXPORT_SYMBOL_GPL(nft_data_init);
7237 * nft_data_release - release a nft_data item
7239 * @data: struct nft_data to release
7240 * @type: type of data
7242 * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
7243 * all others need to be released by calling this function.
7245 void nft_data_release(const struct nft_data *data, enum nft_data_types type)
7247 if (type < NFT_DATA_VERDICT)
7250 case NFT_DATA_VERDICT:
7251 return nft_verdict_uninit(data);
7256 EXPORT_SYMBOL_GPL(nft_data_release);
7258 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
7259 enum nft_data_types type, unsigned int len)
7261 struct nlattr *nest;
7264 nest = nla_nest_start(skb, attr);
7269 case NFT_DATA_VALUE:
7270 err = nft_value_dump(skb, data, len);
7272 case NFT_DATA_VERDICT:
7273 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
7280 nla_nest_end(skb, nest);
7283 EXPORT_SYMBOL_GPL(nft_data_dump);
7285 int __nft_release_basechain(struct nft_ctx *ctx)
7287 struct nft_rule *rule, *nr;
7289 if (WARN_ON(!nft_is_base_chain(ctx->chain)))
7292 nf_tables_unregister_hook(ctx->net, ctx->chain->table, ctx->chain);
7293 list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
7294 list_del(&rule->list);
7296 nf_tables_rule_release(ctx, rule);
7298 nft_chain_del(ctx->chain);
7300 nf_tables_chain_destroy(ctx);
7304 EXPORT_SYMBOL_GPL(__nft_release_basechain);
7306 static void __nft_release_tables(struct net *net)
7308 struct nft_flowtable *flowtable, *nf;
7309 struct nft_table *table, *nt;
7310 struct nft_chain *chain, *nc;
7311 struct nft_object *obj, *ne;
7312 struct nft_rule *rule, *nr;
7313 struct nft_set *set, *ns;
7314 struct nft_ctx ctx = {
7316 .family = NFPROTO_NETDEV,
7319 list_for_each_entry_safe(table, nt, &net->nft.tables, list) {
7320 ctx.family = table->family;
7322 list_for_each_entry(chain, &table->chains, list)
7323 nf_tables_unregister_hook(net, table, chain);
7324 /* No packets are walking on these chains anymore. */
7326 list_for_each_entry(chain, &table->chains, list) {
7328 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
7329 list_del(&rule->list);
7331 nf_tables_rule_release(&ctx, rule);
7334 list_for_each_entry_safe(flowtable, nf, &table->flowtables, list) {
7335 list_del(&flowtable->list);
7337 nf_tables_flowtable_destroy(flowtable);
7339 list_for_each_entry_safe(set, ns, &table->sets, list) {
7340 list_del(&set->list);
7342 nft_set_destroy(set);
7344 list_for_each_entry_safe(obj, ne, &table->objects, list) {
7345 list_del(&obj->list);
7347 nft_obj_destroy(&ctx, obj);
7349 list_for_each_entry_safe(chain, nc, &table->chains, list) {
7351 nft_chain_del(chain);
7353 nf_tables_chain_destroy(&ctx);
7355 list_del(&table->list);
7356 nf_tables_table_destroy(&ctx);
7360 static int __net_init nf_tables_init_net(struct net *net)
7362 INIT_LIST_HEAD(&net->nft.tables);
7363 INIT_LIST_HEAD(&net->nft.commit_list);
7364 mutex_init(&net->nft.commit_mutex);
7365 net->nft.base_seq = 1;
7366 net->nft.validate_state = NFT_VALIDATE_SKIP;
7371 static void __net_exit nf_tables_exit_net(struct net *net)
7373 mutex_lock(&net->nft.commit_mutex);
7374 if (!list_empty(&net->nft.commit_list))
7375 __nf_tables_abort(net);
7376 __nft_release_tables(net);
7377 mutex_unlock(&net->nft.commit_mutex);
7378 WARN_ON_ONCE(!list_empty(&net->nft.tables));
7381 static struct pernet_operations nf_tables_net_ops = {
7382 .init = nf_tables_init_net,
7383 .exit = nf_tables_exit_net,
7386 static int __init nf_tables_module_init(void)
7390 err = register_pernet_subsys(&nf_tables_net_ops);
7394 err = nft_chain_filter_init();
7398 err = nf_tables_core_module_init();
7402 err = register_netdevice_notifier(&nf_tables_flowtable_notifier);
7407 err = nfnetlink_subsys_register(&nf_tables_subsys);
7413 unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
7415 nf_tables_core_module_exit();
7417 nft_chain_filter_fini();
7419 unregister_pernet_subsys(&nf_tables_net_ops);
7423 static void __exit nf_tables_module_exit(void)
7425 nfnetlink_subsys_unregister(&nf_tables_subsys);
7426 unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
7427 nft_chain_filter_fini();
7428 unregister_pernet_subsys(&nf_tables_net_ops);
7430 nf_tables_core_module_exit();
7433 module_init(nf_tables_module_init);
7434 module_exit(nf_tables_module_exit);
7436 MODULE_LICENSE("GPL");
7437 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
7438 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);