1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (c) 2007-2009 Patrick McHardy <kaber@trash.net>
5 * Development of this code funded by Astaro AG (http://www.astaro.com/)
8 #include <linux/module.h>
9 #include <linux/init.h>
10 #include <linux/list.h>
11 #include <linux/skbuff.h>
12 #include <linux/netlink.h>
13 #include <linux/vmalloc.h>
14 #include <linux/rhashtable.h>
15 #include <linux/netfilter.h>
16 #include <linux/netfilter/nfnetlink.h>
17 #include <linux/netfilter/nf_tables.h>
18 #include <net/netfilter/nf_flow_table.h>
19 #include <net/netfilter/nf_tables_core.h>
20 #include <net/netfilter/nf_tables.h>
21 #include <net/netfilter/nf_tables_offload.h>
22 #include <net/net_namespace.h>
25 #define NFT_MODULE_AUTOLOAD_LIMIT (MODULE_NAME_LEN - sizeof("nft-expr-255-"))
27 static LIST_HEAD(nf_tables_expressions);
28 static LIST_HEAD(nf_tables_objects);
29 static LIST_HEAD(nf_tables_flowtables);
30 static LIST_HEAD(nf_tables_destroy_list);
31 static DEFINE_SPINLOCK(nf_tables_destroy_list_lock);
32 static u64 table_handle;
35 NFT_VALIDATE_SKIP = 0,
40 static struct rhltable nft_objname_ht;
42 static u32 nft_chain_hash(const void *data, u32 len, u32 seed);
43 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed);
44 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *, const void *);
46 static u32 nft_objname_hash(const void *data, u32 len, u32 seed);
47 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed);
48 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *, const void *);
50 static const struct rhashtable_params nft_chain_ht_params = {
51 .head_offset = offsetof(struct nft_chain, rhlhead),
52 .key_offset = offsetof(struct nft_chain, name),
53 .hashfn = nft_chain_hash,
54 .obj_hashfn = nft_chain_hash_obj,
55 .obj_cmpfn = nft_chain_hash_cmp,
56 .automatic_shrinking = true,
59 static const struct rhashtable_params nft_objname_ht_params = {
60 .head_offset = offsetof(struct nft_object, rhlhead),
61 .key_offset = offsetof(struct nft_object, key),
62 .hashfn = nft_objname_hash,
63 .obj_hashfn = nft_objname_hash_obj,
64 .obj_cmpfn = nft_objname_hash_cmp,
65 .automatic_shrinking = true,
68 static void nft_validate_state_update(struct net *net, u8 new_validate_state)
70 switch (net->nft.validate_state) {
71 case NFT_VALIDATE_SKIP:
72 WARN_ON_ONCE(new_validate_state == NFT_VALIDATE_DO);
74 case NFT_VALIDATE_NEED:
77 if (new_validate_state == NFT_VALIDATE_NEED)
81 net->nft.validate_state = new_validate_state;
83 static void nf_tables_trans_destroy_work(struct work_struct *w);
84 static DECLARE_WORK(trans_destroy_work, nf_tables_trans_destroy_work);
86 static void nft_ctx_init(struct nft_ctx *ctx,
88 const struct sk_buff *skb,
89 const struct nlmsghdr *nlh,
91 struct nft_table *table,
92 struct nft_chain *chain,
93 const struct nlattr * const *nla)
101 ctx->portid = NETLINK_CB(skb).portid;
102 ctx->report = nlmsg_report(nlh);
103 ctx->flags = nlh->nlmsg_flags;
104 ctx->seq = nlh->nlmsg_seq;
107 static struct nft_trans *nft_trans_alloc_gfp(const struct nft_ctx *ctx,
108 int msg_type, u32 size, gfp_t gfp)
110 struct nft_trans *trans;
112 trans = kzalloc(sizeof(struct nft_trans) + size, gfp);
116 trans->msg_type = msg_type;
122 static struct nft_trans *nft_trans_alloc(const struct nft_ctx *ctx,
123 int msg_type, u32 size)
125 return nft_trans_alloc_gfp(ctx, msg_type, size, GFP_KERNEL);
128 static void nft_trans_destroy(struct nft_trans *trans)
130 list_del(&trans->list);
134 static void nft_set_trans_bind(const struct nft_ctx *ctx, struct nft_set *set)
136 struct net *net = ctx->net;
137 struct nft_trans *trans;
139 if (!nft_set_is_anonymous(set))
142 list_for_each_entry_reverse(trans, &net->nft.commit_list, list) {
143 switch (trans->msg_type) {
145 if (nft_trans_set(trans) == set)
146 nft_trans_set_bound(trans) = true;
148 case NFT_MSG_NEWSETELEM:
149 if (nft_trans_elem_set(trans) == set)
150 nft_trans_elem_set_bound(trans) = true;
156 static int nft_netdev_register_hooks(struct net *net,
157 struct list_head *hook_list)
159 struct nft_hook *hook;
163 list_for_each_entry(hook, hook_list, list) {
164 err = nf_register_net_hook(net, &hook->ops);
173 list_for_each_entry(hook, hook_list, list) {
177 nf_unregister_net_hook(net, &hook->ops);
182 static void nft_netdev_unregister_hooks(struct net *net,
183 struct list_head *hook_list)
185 struct nft_hook *hook;
187 list_for_each_entry(hook, hook_list, list)
188 nf_unregister_net_hook(net, &hook->ops);
191 static int nft_register_basechain_hooks(struct net *net, int family,
192 struct nft_base_chain *basechain)
194 if (family == NFPROTO_NETDEV)
195 return nft_netdev_register_hooks(net, &basechain->hook_list);
197 return nf_register_net_hook(net, &basechain->ops);
200 static void nft_unregister_basechain_hooks(struct net *net, int family,
201 struct nft_base_chain *basechain)
203 if (family == NFPROTO_NETDEV)
204 nft_netdev_unregister_hooks(net, &basechain->hook_list);
206 nf_unregister_net_hook(net, &basechain->ops);
209 static int nf_tables_register_hook(struct net *net,
210 const struct nft_table *table,
211 struct nft_chain *chain)
213 struct nft_base_chain *basechain;
214 const struct nf_hook_ops *ops;
216 if (table->flags & NFT_TABLE_F_DORMANT ||
217 !nft_is_base_chain(chain))
220 basechain = nft_base_chain(chain);
221 ops = &basechain->ops;
223 if (basechain->type->ops_register)
224 return basechain->type->ops_register(net, ops);
226 return nft_register_basechain_hooks(net, table->family, basechain);
229 static void nf_tables_unregister_hook(struct net *net,
230 const struct nft_table *table,
231 struct nft_chain *chain)
233 struct nft_base_chain *basechain;
234 const struct nf_hook_ops *ops;
236 if (table->flags & NFT_TABLE_F_DORMANT ||
237 !nft_is_base_chain(chain))
239 basechain = nft_base_chain(chain);
240 ops = &basechain->ops;
242 if (basechain->type->ops_unregister)
243 return basechain->type->ops_unregister(net, ops);
245 nft_unregister_basechain_hooks(net, table->family, basechain);
248 static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type)
250 struct nft_trans *trans;
252 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table));
256 if (msg_type == NFT_MSG_NEWTABLE)
257 nft_activate_next(ctx->net, ctx->table);
259 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
263 static int nft_deltable(struct nft_ctx *ctx)
267 err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE);
271 nft_deactivate_next(ctx->net, ctx->table);
275 static struct nft_trans *nft_trans_chain_add(struct nft_ctx *ctx, int msg_type)
277 struct nft_trans *trans;
279 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain));
281 return ERR_PTR(-ENOMEM);
283 if (msg_type == NFT_MSG_NEWCHAIN)
284 nft_activate_next(ctx->net, ctx->chain);
286 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
290 static int nft_delchain(struct nft_ctx *ctx)
292 struct nft_trans *trans;
294 trans = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN);
296 return PTR_ERR(trans);
299 nft_deactivate_next(ctx->net, ctx->chain);
304 static void nft_rule_expr_activate(const struct nft_ctx *ctx,
305 struct nft_rule *rule)
307 struct nft_expr *expr;
309 expr = nft_expr_first(rule);
310 while (expr != nft_expr_last(rule) && expr->ops) {
311 if (expr->ops->activate)
312 expr->ops->activate(ctx, expr);
314 expr = nft_expr_next(expr);
318 static void nft_rule_expr_deactivate(const struct nft_ctx *ctx,
319 struct nft_rule *rule,
320 enum nft_trans_phase phase)
322 struct nft_expr *expr;
324 expr = nft_expr_first(rule);
325 while (expr != nft_expr_last(rule) && expr->ops) {
326 if (expr->ops->deactivate)
327 expr->ops->deactivate(ctx, expr, phase);
329 expr = nft_expr_next(expr);
334 nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule)
336 /* You cannot delete the same rule twice */
337 if (nft_is_active_next(ctx->net, rule)) {
338 nft_deactivate_next(ctx->net, rule);
345 static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type,
346 struct nft_rule *rule)
348 struct nft_trans *trans;
350 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule));
354 if (msg_type == NFT_MSG_NEWRULE && ctx->nla[NFTA_RULE_ID] != NULL) {
355 nft_trans_rule_id(trans) =
356 ntohl(nla_get_be32(ctx->nla[NFTA_RULE_ID]));
358 nft_trans_rule(trans) = rule;
359 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
364 static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule)
366 struct nft_flow_rule *flow;
367 struct nft_trans *trans;
370 trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule);
374 if (ctx->chain->flags & NFT_CHAIN_HW_OFFLOAD) {
375 flow = nft_flow_rule_create(ctx->net, rule);
377 nft_trans_destroy(trans);
378 return PTR_ERR(flow);
381 nft_trans_flow_rule(trans) = flow;
384 err = nf_tables_delrule_deactivate(ctx, rule);
386 nft_trans_destroy(trans);
389 nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_PREPARE);
394 static int nft_delrule_by_chain(struct nft_ctx *ctx)
396 struct nft_rule *rule;
399 list_for_each_entry(rule, &ctx->chain->rules, list) {
400 if (!nft_is_active_next(ctx->net, rule))
403 err = nft_delrule(ctx, rule);
410 static int nft_trans_set_add(const struct nft_ctx *ctx, int msg_type,
413 struct nft_trans *trans;
415 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
419 if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] != NULL) {
420 nft_trans_set_id(trans) =
421 ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
422 nft_activate_next(ctx->net, set);
424 nft_trans_set(trans) = set;
425 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
430 static int nft_delset(const struct nft_ctx *ctx, struct nft_set *set)
434 err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set);
438 nft_deactivate_next(ctx->net, set);
444 static int nft_trans_obj_add(struct nft_ctx *ctx, int msg_type,
445 struct nft_object *obj)
447 struct nft_trans *trans;
449 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_obj));
453 if (msg_type == NFT_MSG_NEWOBJ)
454 nft_activate_next(ctx->net, obj);
456 nft_trans_obj(trans) = obj;
457 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
462 static int nft_delobj(struct nft_ctx *ctx, struct nft_object *obj)
466 err = nft_trans_obj_add(ctx, NFT_MSG_DELOBJ, obj);
470 nft_deactivate_next(ctx->net, obj);
476 static int nft_trans_flowtable_add(struct nft_ctx *ctx, int msg_type,
477 struct nft_flowtable *flowtable)
479 struct nft_trans *trans;
481 trans = nft_trans_alloc(ctx, msg_type,
482 sizeof(struct nft_trans_flowtable));
486 if (msg_type == NFT_MSG_NEWFLOWTABLE)
487 nft_activate_next(ctx->net, flowtable);
489 nft_trans_flowtable(trans) = flowtable;
490 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
495 static int nft_delflowtable(struct nft_ctx *ctx,
496 struct nft_flowtable *flowtable)
500 err = nft_trans_flowtable_add(ctx, NFT_MSG_DELFLOWTABLE, flowtable);
504 nft_deactivate_next(ctx->net, flowtable);
514 static struct nft_table *nft_table_lookup(const struct net *net,
515 const struct nlattr *nla,
516 u8 family, u8 genmask)
518 struct nft_table *table;
521 return ERR_PTR(-EINVAL);
523 list_for_each_entry_rcu(table, &net->nft.tables, list) {
524 if (!nla_strcmp(nla, table->name) &&
525 table->family == family &&
526 nft_active_genmask(table, genmask))
530 return ERR_PTR(-ENOENT);
533 static struct nft_table *nft_table_lookup_byhandle(const struct net *net,
534 const struct nlattr *nla,
537 struct nft_table *table;
539 list_for_each_entry(table, &net->nft.tables, list) {
540 if (be64_to_cpu(nla_get_be64(nla)) == table->handle &&
541 nft_active_genmask(table, genmask))
545 return ERR_PTR(-ENOENT);
548 static inline u64 nf_tables_alloc_handle(struct nft_table *table)
550 return ++table->hgenerator;
553 static const struct nft_chain_type *chain_type[NFPROTO_NUMPROTO][NFT_CHAIN_T_MAX];
555 static const struct nft_chain_type *
556 __nft_chain_type_get(u8 family, enum nft_chain_types type)
558 if (family >= NFPROTO_NUMPROTO ||
559 type >= NFT_CHAIN_T_MAX)
562 return chain_type[family][type];
565 static const struct nft_chain_type *
566 __nf_tables_chain_type_lookup(const struct nlattr *nla, u8 family)
568 const struct nft_chain_type *type;
571 for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
572 type = __nft_chain_type_get(family, i);
575 if (!nla_strcmp(nla, type->name))
581 struct nft_module_request {
582 struct list_head list;
583 char module[MODULE_NAME_LEN];
587 #ifdef CONFIG_MODULES
588 static int nft_request_module(struct net *net, const char *fmt, ...)
590 char module_name[MODULE_NAME_LEN];
591 struct nft_module_request *req;
596 ret = vsnprintf(module_name, MODULE_NAME_LEN, fmt, args);
598 if (ret >= MODULE_NAME_LEN)
601 list_for_each_entry(req, &net->nft.module_list, list) {
602 if (!strcmp(req->module, module_name)) {
606 /* A request to load this module already exists. */
611 req = kmalloc(sizeof(*req), GFP_KERNEL);
616 strlcpy(req->module, module_name, MODULE_NAME_LEN);
617 list_add_tail(&req->list, &net->nft.module_list);
623 static void lockdep_nfnl_nft_mutex_not_held(void)
625 #ifdef CONFIG_PROVE_LOCKING
626 WARN_ON_ONCE(lockdep_nfnl_is_held(NFNL_SUBSYS_NFTABLES));
630 static const struct nft_chain_type *
631 nf_tables_chain_type_lookup(struct net *net, const struct nlattr *nla,
632 u8 family, bool autoload)
634 const struct nft_chain_type *type;
636 type = __nf_tables_chain_type_lookup(nla, family);
640 lockdep_nfnl_nft_mutex_not_held();
641 #ifdef CONFIG_MODULES
643 if (nft_request_module(net, "nft-chain-%u-%.*s", family,
645 (const char *)nla_data(nla)) == -EAGAIN)
646 return ERR_PTR(-EAGAIN);
649 return ERR_PTR(-ENOENT);
652 static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
653 [NFTA_TABLE_NAME] = { .type = NLA_STRING,
654 .len = NFT_TABLE_MAXNAMELEN - 1 },
655 [NFTA_TABLE_FLAGS] = { .type = NLA_U32 },
656 [NFTA_TABLE_HANDLE] = { .type = NLA_U64 },
659 static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
660 u32 portid, u32 seq, int event, u32 flags,
661 int family, const struct nft_table *table)
663 struct nlmsghdr *nlh;
664 struct nfgenmsg *nfmsg;
666 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
667 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
669 goto nla_put_failure;
671 nfmsg = nlmsg_data(nlh);
672 nfmsg->nfgen_family = family;
673 nfmsg->version = NFNETLINK_V0;
674 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
676 if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
677 nla_put_be32(skb, NFTA_TABLE_FLAGS, htonl(table->flags)) ||
678 nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)) ||
679 nla_put_be64(skb, NFTA_TABLE_HANDLE, cpu_to_be64(table->handle),
681 goto nla_put_failure;
687 nlmsg_trim(skb, nlh);
691 static void nf_tables_table_notify(const struct nft_ctx *ctx, int event)
697 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
700 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
704 err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
705 event, 0, ctx->family, ctx->table);
711 nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
712 ctx->report, GFP_KERNEL);
715 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
718 static int nf_tables_dump_tables(struct sk_buff *skb,
719 struct netlink_callback *cb)
721 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
722 const struct nft_table *table;
723 unsigned int idx = 0, s_idx = cb->args[0];
724 struct net *net = sock_net(skb->sk);
725 int family = nfmsg->nfgen_family;
728 cb->seq = net->nft.base_seq;
730 list_for_each_entry_rcu(table, &net->nft.tables, list) {
731 if (family != NFPROTO_UNSPEC && family != table->family)
737 memset(&cb->args[1], 0,
738 sizeof(cb->args) - sizeof(cb->args[0]));
739 if (!nft_is_active(net, table))
741 if (nf_tables_fill_table_info(skb, net,
742 NETLINK_CB(cb->skb).portid,
744 NFT_MSG_NEWTABLE, NLM_F_MULTI,
745 table->family, table) < 0)
748 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
758 static int nft_netlink_dump_start_rcu(struct sock *nlsk, struct sk_buff *skb,
759 const struct nlmsghdr *nlh,
760 struct netlink_dump_control *c)
764 if (!try_module_get(THIS_MODULE))
768 err = netlink_dump_start(nlsk, skb, nlh, c);
770 module_put(THIS_MODULE);
775 /* called with rcu_read_lock held */
776 static int nf_tables_gettable(struct net *net, struct sock *nlsk,
777 struct sk_buff *skb, const struct nlmsghdr *nlh,
778 const struct nlattr * const nla[],
779 struct netlink_ext_ack *extack)
781 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
782 u8 genmask = nft_genmask_cur(net);
783 const struct nft_table *table;
784 struct sk_buff *skb2;
785 int family = nfmsg->nfgen_family;
788 if (nlh->nlmsg_flags & NLM_F_DUMP) {
789 struct netlink_dump_control c = {
790 .dump = nf_tables_dump_tables,
791 .module = THIS_MODULE,
794 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
797 table = nft_table_lookup(net, nla[NFTA_TABLE_NAME], family, genmask);
799 NL_SET_BAD_ATTR(extack, nla[NFTA_TABLE_NAME]);
800 return PTR_ERR(table);
803 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
807 err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
808 nlh->nlmsg_seq, NFT_MSG_NEWTABLE, 0,
813 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
820 static void nft_table_disable(struct net *net, struct nft_table *table, u32 cnt)
822 struct nft_chain *chain;
825 list_for_each_entry(chain, &table->chains, list) {
826 if (!nft_is_active_next(net, chain))
828 if (!nft_is_base_chain(chain))
831 if (cnt && i++ == cnt)
834 nft_unregister_basechain_hooks(net, table->family,
835 nft_base_chain(chain));
839 static int nf_tables_table_enable(struct net *net, struct nft_table *table)
841 struct nft_chain *chain;
844 list_for_each_entry(chain, &table->chains, list) {
845 if (!nft_is_active_next(net, chain))
847 if (!nft_is_base_chain(chain))
850 err = nft_register_basechain_hooks(net, table->family,
851 nft_base_chain(chain));
853 goto err_register_hooks;
861 nft_table_disable(net, table, i);
865 static void nf_tables_table_disable(struct net *net, struct nft_table *table)
867 nft_table_disable(net, table, 0);
870 static int nf_tables_updtable(struct nft_ctx *ctx)
872 struct nft_trans *trans;
876 if (!ctx->nla[NFTA_TABLE_FLAGS])
879 flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
880 if (flags & ~NFT_TABLE_F_DORMANT)
883 if (flags == ctx->table->flags)
886 trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
887 sizeof(struct nft_trans_table));
891 if ((flags & NFT_TABLE_F_DORMANT) &&
892 !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
893 nft_trans_table_enable(trans) = false;
894 } else if (!(flags & NFT_TABLE_F_DORMANT) &&
895 ctx->table->flags & NFT_TABLE_F_DORMANT) {
896 ret = nf_tables_table_enable(ctx->net, ctx->table);
898 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
899 nft_trans_table_enable(trans) = true;
905 nft_trans_table_update(trans) = true;
906 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
909 nft_trans_destroy(trans);
913 static u32 nft_chain_hash(const void *data, u32 len, u32 seed)
915 const char *name = data;
917 return jhash(name, strlen(name), seed);
920 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed)
922 const struct nft_chain *chain = data;
924 return nft_chain_hash(chain->name, 0, seed);
927 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *arg,
930 const struct nft_chain *chain = ptr;
931 const char *name = arg->key;
933 return strcmp(chain->name, name);
936 static u32 nft_objname_hash(const void *data, u32 len, u32 seed)
938 const struct nft_object_hash_key *k = data;
940 seed ^= hash_ptr(k->table, 32);
942 return jhash(k->name, strlen(k->name), seed);
945 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed)
947 const struct nft_object *obj = data;
949 return nft_objname_hash(&obj->key, 0, seed);
952 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *arg,
955 const struct nft_object_hash_key *k = arg->key;
956 const struct nft_object *obj = ptr;
958 if (obj->key.table != k->table)
961 return strcmp(obj->key.name, k->name);
964 static int nf_tables_newtable(struct net *net, struct sock *nlsk,
965 struct sk_buff *skb, const struct nlmsghdr *nlh,
966 const struct nlattr * const nla[],
967 struct netlink_ext_ack *extack)
969 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
970 u8 genmask = nft_genmask_next(net);
971 int family = nfmsg->nfgen_family;
972 const struct nlattr *attr;
973 struct nft_table *table;
978 lockdep_assert_held(&net->nft.commit_mutex);
979 attr = nla[NFTA_TABLE_NAME];
980 table = nft_table_lookup(net, attr, family, genmask);
982 if (PTR_ERR(table) != -ENOENT)
983 return PTR_ERR(table);
985 if (nlh->nlmsg_flags & NLM_F_EXCL) {
986 NL_SET_BAD_ATTR(extack, attr);
989 if (nlh->nlmsg_flags & NLM_F_REPLACE)
992 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
993 return nf_tables_updtable(&ctx);
996 if (nla[NFTA_TABLE_FLAGS]) {
997 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
998 if (flags & ~NFT_TABLE_F_DORMANT)
1003 table = kzalloc(sizeof(*table), GFP_KERNEL);
1007 table->name = nla_strdup(attr, GFP_KERNEL);
1008 if (table->name == NULL)
1011 err = rhltable_init(&table->chains_ht, &nft_chain_ht_params);
1015 INIT_LIST_HEAD(&table->chains);
1016 INIT_LIST_HEAD(&table->sets);
1017 INIT_LIST_HEAD(&table->objects);
1018 INIT_LIST_HEAD(&table->flowtables);
1019 table->family = family;
1020 table->flags = flags;
1021 table->handle = ++table_handle;
1023 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
1024 err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
1028 list_add_tail_rcu(&table->list, &net->nft.tables);
1031 rhltable_destroy(&table->chains_ht);
1040 static int nft_flush_table(struct nft_ctx *ctx)
1042 struct nft_flowtable *flowtable, *nft;
1043 struct nft_chain *chain, *nc;
1044 struct nft_object *obj, *ne;
1045 struct nft_set *set, *ns;
1048 list_for_each_entry(chain, &ctx->table->chains, list) {
1049 if (!nft_is_active_next(ctx->net, chain))
1054 err = nft_delrule_by_chain(ctx);
1059 list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
1060 if (!nft_is_active_next(ctx->net, set))
1063 if (nft_set_is_anonymous(set) &&
1064 !list_empty(&set->bindings))
1067 err = nft_delset(ctx, set);
1072 list_for_each_entry_safe(flowtable, nft, &ctx->table->flowtables, list) {
1073 if (!nft_is_active_next(ctx->net, flowtable))
1076 err = nft_delflowtable(ctx, flowtable);
1081 list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) {
1082 if (!nft_is_active_next(ctx->net, obj))
1085 err = nft_delobj(ctx, obj);
1090 list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
1091 if (!nft_is_active_next(ctx->net, chain))
1096 err = nft_delchain(ctx);
1101 err = nft_deltable(ctx);
1106 static int nft_flush(struct nft_ctx *ctx, int family)
1108 struct nft_table *table, *nt;
1109 const struct nlattr * const *nla = ctx->nla;
1112 list_for_each_entry_safe(table, nt, &ctx->net->nft.tables, list) {
1113 if (family != AF_UNSPEC && table->family != family)
1116 ctx->family = table->family;
1118 if (!nft_is_active_next(ctx->net, table))
1121 if (nla[NFTA_TABLE_NAME] &&
1122 nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
1127 err = nft_flush_table(ctx);
1135 static int nf_tables_deltable(struct net *net, struct sock *nlsk,
1136 struct sk_buff *skb, const struct nlmsghdr *nlh,
1137 const struct nlattr * const nla[],
1138 struct netlink_ext_ack *extack)
1140 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1141 u8 genmask = nft_genmask_next(net);
1142 int family = nfmsg->nfgen_family;
1143 const struct nlattr *attr;
1144 struct nft_table *table;
1147 nft_ctx_init(&ctx, net, skb, nlh, 0, NULL, NULL, nla);
1148 if (family == AF_UNSPEC ||
1149 (!nla[NFTA_TABLE_NAME] && !nla[NFTA_TABLE_HANDLE]))
1150 return nft_flush(&ctx, family);
1152 if (nla[NFTA_TABLE_HANDLE]) {
1153 attr = nla[NFTA_TABLE_HANDLE];
1154 table = nft_table_lookup_byhandle(net, attr, genmask);
1156 attr = nla[NFTA_TABLE_NAME];
1157 table = nft_table_lookup(net, attr, family, genmask);
1160 if (IS_ERR(table)) {
1161 NL_SET_BAD_ATTR(extack, attr);
1162 return PTR_ERR(table);
1165 if (nlh->nlmsg_flags & NLM_F_NONREC &&
1169 ctx.family = family;
1172 return nft_flush_table(&ctx);
1175 static void nf_tables_table_destroy(struct nft_ctx *ctx)
1177 if (WARN_ON(ctx->table->use > 0))
1180 rhltable_destroy(&ctx->table->chains_ht);
1181 kfree(ctx->table->name);
1185 void nft_register_chain_type(const struct nft_chain_type *ctype)
1187 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1188 if (WARN_ON(__nft_chain_type_get(ctype->family, ctype->type))) {
1189 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1192 chain_type[ctype->family][ctype->type] = ctype;
1193 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1195 EXPORT_SYMBOL_GPL(nft_register_chain_type);
1197 void nft_unregister_chain_type(const struct nft_chain_type *ctype)
1199 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1200 chain_type[ctype->family][ctype->type] = NULL;
1201 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1203 EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
1209 static struct nft_chain *
1210 nft_chain_lookup_byhandle(const struct nft_table *table, u64 handle, u8 genmask)
1212 struct nft_chain *chain;
1214 list_for_each_entry(chain, &table->chains, list) {
1215 if (chain->handle == handle &&
1216 nft_active_genmask(chain, genmask))
1220 return ERR_PTR(-ENOENT);
1223 static bool lockdep_commit_lock_is_held(const struct net *net)
1225 #ifdef CONFIG_PROVE_LOCKING
1226 return lockdep_is_held(&net->nft.commit_mutex);
1232 static struct nft_chain *nft_chain_lookup(struct net *net,
1233 struct nft_table *table,
1234 const struct nlattr *nla, u8 genmask)
1236 char search[NFT_CHAIN_MAXNAMELEN + 1];
1237 struct rhlist_head *tmp, *list;
1238 struct nft_chain *chain;
1241 return ERR_PTR(-EINVAL);
1243 nla_strlcpy(search, nla, sizeof(search));
1245 WARN_ON(!rcu_read_lock_held() &&
1246 !lockdep_commit_lock_is_held(net));
1248 chain = ERR_PTR(-ENOENT);
1250 list = rhltable_lookup(&table->chains_ht, search, nft_chain_ht_params);
1254 rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
1255 if (nft_active_genmask(chain, genmask))
1258 chain = ERR_PTR(-ENOENT);
1264 static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
1265 [NFTA_CHAIN_TABLE] = { .type = NLA_STRING,
1266 .len = NFT_TABLE_MAXNAMELEN - 1 },
1267 [NFTA_CHAIN_HANDLE] = { .type = NLA_U64 },
1268 [NFTA_CHAIN_NAME] = { .type = NLA_STRING,
1269 .len = NFT_CHAIN_MAXNAMELEN - 1 },
1270 [NFTA_CHAIN_HOOK] = { .type = NLA_NESTED },
1271 [NFTA_CHAIN_POLICY] = { .type = NLA_U32 },
1272 [NFTA_CHAIN_TYPE] = { .type = NLA_STRING,
1273 .len = NFT_MODULE_AUTOLOAD_LIMIT },
1274 [NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED },
1275 [NFTA_CHAIN_FLAGS] = { .type = NLA_U32 },
1278 static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
1279 [NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 },
1280 [NFTA_HOOK_PRIORITY] = { .type = NLA_U32 },
1281 [NFTA_HOOK_DEV] = { .type = NLA_STRING,
1282 .len = IFNAMSIZ - 1 },
1285 static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
1287 struct nft_stats *cpu_stats, total;
1288 struct nlattr *nest;
1296 memset(&total, 0, sizeof(total));
1297 for_each_possible_cpu(cpu) {
1298 cpu_stats = per_cpu_ptr(stats, cpu);
1300 seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
1301 pkts = cpu_stats->pkts;
1302 bytes = cpu_stats->bytes;
1303 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq));
1305 total.bytes += bytes;
1307 nest = nla_nest_start_noflag(skb, NFTA_CHAIN_COUNTERS);
1309 goto nla_put_failure;
1311 if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts),
1312 NFTA_COUNTER_PAD) ||
1313 nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
1315 goto nla_put_failure;
1317 nla_nest_end(skb, nest);
1324 static int nft_dump_basechain_hook(struct sk_buff *skb, int family,
1325 const struct nft_base_chain *basechain)
1327 const struct nf_hook_ops *ops = &basechain->ops;
1328 struct nft_hook *hook, *first = NULL;
1329 struct nlattr *nest, *nest_devs;
1332 nest = nla_nest_start_noflag(skb, NFTA_CHAIN_HOOK);
1334 goto nla_put_failure;
1335 if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
1336 goto nla_put_failure;
1337 if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
1338 goto nla_put_failure;
1340 if (family == NFPROTO_NETDEV) {
1341 nest_devs = nla_nest_start_noflag(skb, NFTA_HOOK_DEVS);
1342 list_for_each_entry(hook, &basechain->hook_list, list) {
1346 if (nla_put_string(skb, NFTA_DEVICE_NAME,
1347 hook->ops.dev->name))
1348 goto nla_put_failure;
1351 nla_nest_end(skb, nest_devs);
1354 nla_put_string(skb, NFTA_HOOK_DEV, first->ops.dev->name))
1355 goto nla_put_failure;
1357 nla_nest_end(skb, nest);
1364 static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
1365 u32 portid, u32 seq, int event, u32 flags,
1366 int family, const struct nft_table *table,
1367 const struct nft_chain *chain)
1369 struct nlmsghdr *nlh;
1370 struct nfgenmsg *nfmsg;
1372 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
1373 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
1375 goto nla_put_failure;
1377 nfmsg = nlmsg_data(nlh);
1378 nfmsg->nfgen_family = family;
1379 nfmsg->version = NFNETLINK_V0;
1380 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
1382 if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name))
1383 goto nla_put_failure;
1384 if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle),
1386 goto nla_put_failure;
1387 if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name))
1388 goto nla_put_failure;
1390 if (nft_is_base_chain(chain)) {
1391 const struct nft_base_chain *basechain = nft_base_chain(chain);
1392 struct nft_stats __percpu *stats;
1394 if (nft_dump_basechain_hook(skb, family, basechain))
1395 goto nla_put_failure;
1397 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
1398 htonl(basechain->policy)))
1399 goto nla_put_failure;
1401 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
1402 goto nla_put_failure;
1404 stats = rcu_dereference_check(basechain->stats,
1405 lockdep_commit_lock_is_held(net));
1406 if (nft_dump_stats(skb, stats))
1407 goto nla_put_failure;
1410 if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
1411 goto nla_put_failure;
1413 nlmsg_end(skb, nlh);
1417 nlmsg_trim(skb, nlh);
1421 static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event)
1423 struct sk_buff *skb;
1427 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1430 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1434 err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
1435 event, 0, ctx->family, ctx->table,
1442 nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1443 ctx->report, GFP_KERNEL);
1446 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
1449 static int nf_tables_dump_chains(struct sk_buff *skb,
1450 struct netlink_callback *cb)
1452 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1453 const struct nft_table *table;
1454 const struct nft_chain *chain;
1455 unsigned int idx = 0, s_idx = cb->args[0];
1456 struct net *net = sock_net(skb->sk);
1457 int family = nfmsg->nfgen_family;
1460 cb->seq = net->nft.base_seq;
1462 list_for_each_entry_rcu(table, &net->nft.tables, list) {
1463 if (family != NFPROTO_UNSPEC && family != table->family)
1466 list_for_each_entry_rcu(chain, &table->chains, list) {
1470 memset(&cb->args[1], 0,
1471 sizeof(cb->args) - sizeof(cb->args[0]));
1472 if (!nft_is_active(net, chain))
1474 if (nf_tables_fill_chain_info(skb, net,
1475 NETLINK_CB(cb->skb).portid,
1479 table->family, table,
1483 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1494 /* called with rcu_read_lock held */
1495 static int nf_tables_getchain(struct net *net, struct sock *nlsk,
1496 struct sk_buff *skb, const struct nlmsghdr *nlh,
1497 const struct nlattr * const nla[],
1498 struct netlink_ext_ack *extack)
1500 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1501 u8 genmask = nft_genmask_cur(net);
1502 const struct nft_chain *chain;
1503 struct nft_table *table;
1504 struct sk_buff *skb2;
1505 int family = nfmsg->nfgen_family;
1508 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1509 struct netlink_dump_control c = {
1510 .dump = nf_tables_dump_chains,
1511 .module = THIS_MODULE,
1514 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
1517 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask);
1518 if (IS_ERR(table)) {
1519 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
1520 return PTR_ERR(table);
1523 chain = nft_chain_lookup(net, table, nla[NFTA_CHAIN_NAME], genmask);
1524 if (IS_ERR(chain)) {
1525 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
1526 return PTR_ERR(chain);
1529 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1533 err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
1534 nlh->nlmsg_seq, NFT_MSG_NEWCHAIN, 0,
1535 family, table, chain);
1539 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
1546 static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
1547 [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 },
1548 [NFTA_COUNTER_BYTES] = { .type = NLA_U64 },
1551 static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
1553 struct nlattr *tb[NFTA_COUNTER_MAX+1];
1554 struct nft_stats __percpu *newstats;
1555 struct nft_stats *stats;
1558 err = nla_parse_nested_deprecated(tb, NFTA_COUNTER_MAX, attr,
1559 nft_counter_policy, NULL);
1561 return ERR_PTR(err);
1563 if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
1564 return ERR_PTR(-EINVAL);
1566 newstats = netdev_alloc_pcpu_stats(struct nft_stats);
1567 if (newstats == NULL)
1568 return ERR_PTR(-ENOMEM);
1570 /* Restore old counters on this cpu, no problem. Per-cpu statistics
1571 * are not exposed to userspace.
1574 stats = this_cpu_ptr(newstats);
1575 stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
1576 stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
1582 static void nft_chain_stats_replace(struct nft_trans *trans)
1584 struct nft_base_chain *chain = nft_base_chain(trans->ctx.chain);
1586 if (!nft_trans_chain_stats(trans))
1589 nft_trans_chain_stats(trans) =
1590 rcu_replace_pointer(chain->stats, nft_trans_chain_stats(trans),
1591 lockdep_commit_lock_is_held(trans->ctx.net));
1593 if (!nft_trans_chain_stats(trans))
1594 static_branch_inc(&nft_counters_enabled);
1597 static void nf_tables_chain_free_chain_rules(struct nft_chain *chain)
1599 struct nft_rule **g0 = rcu_dereference_raw(chain->rules_gen_0);
1600 struct nft_rule **g1 = rcu_dereference_raw(chain->rules_gen_1);
1606 /* should be NULL either via abort or via successful commit */
1607 WARN_ON_ONCE(chain->rules_next);
1608 kvfree(chain->rules_next);
1611 static void nf_tables_chain_destroy(struct nft_ctx *ctx)
1613 struct nft_chain *chain = ctx->chain;
1614 struct nft_hook *hook, *next;
1616 if (WARN_ON(chain->use > 0))
1619 /* no concurrent access possible anymore */
1620 nf_tables_chain_free_chain_rules(chain);
1622 if (nft_is_base_chain(chain)) {
1623 struct nft_base_chain *basechain = nft_base_chain(chain);
1625 if (ctx->family == NFPROTO_NETDEV) {
1626 list_for_each_entry_safe(hook, next,
1627 &basechain->hook_list, list) {
1628 list_del_rcu(&hook->list);
1629 kfree_rcu(hook, rcu);
1632 module_put(basechain->type->owner);
1633 if (rcu_access_pointer(basechain->stats)) {
1634 static_branch_dec(&nft_counters_enabled);
1635 free_percpu(rcu_dereference_raw(basechain->stats));
1645 static struct nft_hook *nft_netdev_hook_alloc(struct net *net,
1646 const struct nlattr *attr)
1648 struct net_device *dev;
1649 char ifname[IFNAMSIZ];
1650 struct nft_hook *hook;
1653 hook = kmalloc(sizeof(struct nft_hook), GFP_KERNEL);
1656 goto err_hook_alloc;
1659 nla_strlcpy(ifname, attr, IFNAMSIZ);
1660 dev = __dev_get_by_name(net, ifname);
1665 hook->ops.dev = dev;
1672 return ERR_PTR(err);
1675 static bool nft_hook_list_find(struct list_head *hook_list,
1676 const struct nft_hook *this)
1678 struct nft_hook *hook;
1680 list_for_each_entry(hook, hook_list, list) {
1681 if (this->ops.dev == hook->ops.dev)
1688 static int nf_tables_parse_netdev_hooks(struct net *net,
1689 const struct nlattr *attr,
1690 struct list_head *hook_list)
1692 struct nft_hook *hook, *next;
1693 const struct nlattr *tmp;
1694 int rem, n = 0, err;
1696 nla_for_each_nested(tmp, attr, rem) {
1697 if (nla_type(tmp) != NFTA_DEVICE_NAME) {
1702 hook = nft_netdev_hook_alloc(net, tmp);
1704 err = PTR_ERR(hook);
1707 if (nft_hook_list_find(hook_list, hook)) {
1712 list_add_tail(&hook->list, hook_list);
1715 if (n == NFT_NETDEVICE_MAX) {
1726 list_for_each_entry_safe(hook, next, hook_list, list) {
1727 list_del(&hook->list);
1733 struct nft_chain_hook {
1736 const struct nft_chain_type *type;
1737 struct list_head list;
1740 static int nft_chain_parse_netdev(struct net *net,
1741 struct nlattr *tb[],
1742 struct list_head *hook_list)
1744 struct nft_hook *hook;
1747 if (tb[NFTA_HOOK_DEV]) {
1748 hook = nft_netdev_hook_alloc(net, tb[NFTA_HOOK_DEV]);
1750 return PTR_ERR(hook);
1752 list_add_tail(&hook->list, hook_list);
1753 } else if (tb[NFTA_HOOK_DEVS]) {
1754 err = nf_tables_parse_netdev_hooks(net, tb[NFTA_HOOK_DEVS],
1765 static int nft_chain_parse_hook(struct net *net,
1766 const struct nlattr * const nla[],
1767 struct nft_chain_hook *hook, u8 family,
1770 struct nlattr *ha[NFTA_HOOK_MAX + 1];
1771 const struct nft_chain_type *type;
1774 lockdep_assert_held(&net->nft.commit_mutex);
1775 lockdep_nfnl_nft_mutex_not_held();
1777 err = nla_parse_nested_deprecated(ha, NFTA_HOOK_MAX,
1778 nla[NFTA_CHAIN_HOOK],
1779 nft_hook_policy, NULL);
1783 if (ha[NFTA_HOOK_HOOKNUM] == NULL ||
1784 ha[NFTA_HOOK_PRIORITY] == NULL)
1787 hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
1788 hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
1790 type = __nft_chain_type_get(family, NFT_CHAIN_T_DEFAULT);
1794 if (nla[NFTA_CHAIN_TYPE]) {
1795 type = nf_tables_chain_type_lookup(net, nla[NFTA_CHAIN_TYPE],
1798 return PTR_ERR(type);
1800 if (hook->num > NF_MAX_HOOKS || !(type->hook_mask & (1 << hook->num)))
1803 if (type->type == NFT_CHAIN_T_NAT &&
1804 hook->priority <= NF_IP_PRI_CONNTRACK)
1807 if (!try_module_get(type->owner))
1812 INIT_LIST_HEAD(&hook->list);
1813 if (family == NFPROTO_NETDEV) {
1814 err = nft_chain_parse_netdev(net, ha, &hook->list);
1816 module_put(type->owner);
1819 } else if (ha[NFTA_HOOK_DEV] || ha[NFTA_HOOK_DEVS]) {
1820 module_put(type->owner);
1827 static void nft_chain_release_hook(struct nft_chain_hook *hook)
1829 struct nft_hook *h, *next;
1831 list_for_each_entry_safe(h, next, &hook->list, list) {
1835 module_put(hook->type->owner);
1838 struct nft_rules_old {
1840 struct nft_rule **start;
1843 static struct nft_rule **nf_tables_chain_alloc_rules(const struct nft_chain *chain,
1846 if (alloc > INT_MAX)
1849 alloc += 1; /* NULL, ends rules */
1850 if (sizeof(struct nft_rule *) > INT_MAX / alloc)
1853 alloc *= sizeof(struct nft_rule *);
1854 alloc += sizeof(struct nft_rules_old);
1856 return kvmalloc(alloc, GFP_KERNEL);
1859 static void nft_basechain_hook_init(struct nf_hook_ops *ops, u8 family,
1860 const struct nft_chain_hook *hook,
1861 struct nft_chain *chain)
1864 ops->hooknum = hook->num;
1865 ops->priority = hook->priority;
1867 ops->hook = hook->type->hooks[ops->hooknum];
1870 static int nft_basechain_init(struct nft_base_chain *basechain, u8 family,
1871 struct nft_chain_hook *hook, u32 flags)
1873 struct nft_chain *chain;
1876 basechain->type = hook->type;
1877 INIT_LIST_HEAD(&basechain->hook_list);
1878 chain = &basechain->chain;
1880 if (family == NFPROTO_NETDEV) {
1881 list_splice_init(&hook->list, &basechain->hook_list);
1882 list_for_each_entry(h, &basechain->hook_list, list)
1883 nft_basechain_hook_init(&h->ops, family, hook, chain);
1885 basechain->ops.hooknum = hook->num;
1886 basechain->ops.priority = hook->priority;
1888 nft_basechain_hook_init(&basechain->ops, family, hook, chain);
1891 chain->flags |= NFT_BASE_CHAIN | flags;
1892 basechain->policy = NF_ACCEPT;
1893 if (chain->flags & NFT_CHAIN_HW_OFFLOAD &&
1894 nft_chain_offload_priority(basechain) < 0)
1897 flow_block_init(&basechain->flow_block);
1902 static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask,
1903 u8 policy, u32 flags)
1905 const struct nlattr * const *nla = ctx->nla;
1906 struct nft_table *table = ctx->table;
1907 struct nft_base_chain *basechain;
1908 struct nft_stats __percpu *stats;
1909 struct net *net = ctx->net;
1910 struct nft_trans *trans;
1911 struct nft_chain *chain;
1912 struct nft_rule **rules;
1915 if (table->use == UINT_MAX)
1918 if (nla[NFTA_CHAIN_HOOK]) {
1919 struct nft_chain_hook hook;
1921 err = nft_chain_parse_hook(net, nla, &hook, family, true);
1925 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL);
1926 if (basechain == NULL) {
1927 nft_chain_release_hook(&hook);
1930 chain = &basechain->chain;
1932 if (nla[NFTA_CHAIN_COUNTERS]) {
1933 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1934 if (IS_ERR(stats)) {
1935 nft_chain_release_hook(&hook);
1937 return PTR_ERR(stats);
1939 rcu_assign_pointer(basechain->stats, stats);
1940 static_branch_inc(&nft_counters_enabled);
1943 err = nft_basechain_init(basechain, family, &hook, flags);
1945 nft_chain_release_hook(&hook);
1950 chain = kzalloc(sizeof(*chain), GFP_KERNEL);
1956 INIT_LIST_HEAD(&chain->rules);
1957 chain->handle = nf_tables_alloc_handle(table);
1958 chain->table = table;
1959 chain->name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL);
1965 rules = nf_tables_chain_alloc_rules(chain, 0);
1972 rcu_assign_pointer(chain->rules_gen_0, rules);
1973 rcu_assign_pointer(chain->rules_gen_1, rules);
1975 err = nf_tables_register_hook(net, table, chain);
1979 err = rhltable_insert_key(&table->chains_ht, chain->name,
1980 &chain->rhlhead, nft_chain_ht_params);
1984 trans = nft_trans_chain_add(ctx, NFT_MSG_NEWCHAIN);
1985 if (IS_ERR(trans)) {
1986 err = PTR_ERR(trans);
1987 rhltable_remove(&table->chains_ht, &chain->rhlhead,
1988 nft_chain_ht_params);
1992 nft_trans_chain_policy(trans) = NFT_CHAIN_POLICY_UNSET;
1993 if (nft_is_base_chain(chain))
1994 nft_trans_chain_policy(trans) = policy;
1997 list_add_tail_rcu(&chain->list, &table->chains);
2001 nf_tables_unregister_hook(net, table, chain);
2003 nf_tables_chain_destroy(ctx);
2008 static bool nft_hook_list_equal(struct list_head *hook_list1,
2009 struct list_head *hook_list2)
2011 struct nft_hook *hook;
2015 list_for_each_entry(hook, hook_list2, list) {
2016 if (!nft_hook_list_find(hook_list1, hook))
2021 list_for_each_entry(hook, hook_list1, list)
2027 static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
2030 const struct nlattr * const *nla = ctx->nla;
2031 struct nft_table *table = ctx->table;
2032 struct nft_chain *chain = ctx->chain;
2033 struct nft_base_chain *basechain;
2034 struct nft_stats *stats = NULL;
2035 struct nft_chain_hook hook;
2036 struct nf_hook_ops *ops;
2037 struct nft_trans *trans;
2040 if (chain->flags ^ flags)
2043 if (nla[NFTA_CHAIN_HOOK]) {
2044 if (!nft_is_base_chain(chain))
2047 err = nft_chain_parse_hook(ctx->net, nla, &hook, ctx->family,
2052 basechain = nft_base_chain(chain);
2053 if (basechain->type != hook.type) {
2054 nft_chain_release_hook(&hook);
2058 if (ctx->family == NFPROTO_NETDEV) {
2059 if (!nft_hook_list_equal(&basechain->hook_list,
2061 nft_chain_release_hook(&hook);
2065 ops = &basechain->ops;
2066 if (ops->hooknum != hook.num ||
2067 ops->priority != hook.priority) {
2068 nft_chain_release_hook(&hook);
2072 nft_chain_release_hook(&hook);
2075 if (nla[NFTA_CHAIN_HANDLE] &&
2076 nla[NFTA_CHAIN_NAME]) {
2077 struct nft_chain *chain2;
2079 chain2 = nft_chain_lookup(ctx->net, table,
2080 nla[NFTA_CHAIN_NAME], genmask);
2081 if (!IS_ERR(chain2))
2085 if (nla[NFTA_CHAIN_COUNTERS]) {
2086 if (!nft_is_base_chain(chain))
2089 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2091 return PTR_ERR(stats);
2095 trans = nft_trans_alloc(ctx, NFT_MSG_NEWCHAIN,
2096 sizeof(struct nft_trans_chain));
2100 nft_trans_chain_stats(trans) = stats;
2101 nft_trans_chain_update(trans) = true;
2103 if (nla[NFTA_CHAIN_POLICY])
2104 nft_trans_chain_policy(trans) = policy;
2106 nft_trans_chain_policy(trans) = -1;
2108 if (nla[NFTA_CHAIN_HANDLE] &&
2109 nla[NFTA_CHAIN_NAME]) {
2110 struct nft_trans *tmp;
2114 name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL);
2119 list_for_each_entry(tmp, &ctx->net->nft.commit_list, list) {
2120 if (tmp->msg_type == NFT_MSG_NEWCHAIN &&
2121 tmp->ctx.table == table &&
2122 nft_trans_chain_update(tmp) &&
2123 nft_trans_chain_name(tmp) &&
2124 strcmp(name, nft_trans_chain_name(tmp)) == 0) {
2130 nft_trans_chain_name(trans) = name;
2132 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
2141 static int nf_tables_newchain(struct net *net, struct sock *nlsk,
2142 struct sk_buff *skb, const struct nlmsghdr *nlh,
2143 const struct nlattr * const nla[],
2144 struct netlink_ext_ack *extack)
2146 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2147 u8 genmask = nft_genmask_next(net);
2148 int family = nfmsg->nfgen_family;
2149 const struct nlattr *attr;
2150 struct nft_table *table;
2151 struct nft_chain *chain;
2152 u8 policy = NF_ACCEPT;
2157 lockdep_assert_held(&net->nft.commit_mutex);
2159 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask);
2160 if (IS_ERR(table)) {
2161 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2162 return PTR_ERR(table);
2166 attr = nla[NFTA_CHAIN_NAME];
2168 if (nla[NFTA_CHAIN_HANDLE]) {
2169 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
2170 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2171 if (IS_ERR(chain)) {
2172 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_HANDLE]);
2173 return PTR_ERR(chain);
2175 attr = nla[NFTA_CHAIN_HANDLE];
2177 chain = nft_chain_lookup(net, table, attr, genmask);
2178 if (IS_ERR(chain)) {
2179 if (PTR_ERR(chain) != -ENOENT) {
2180 NL_SET_BAD_ATTR(extack, attr);
2181 return PTR_ERR(chain);
2187 if (nla[NFTA_CHAIN_POLICY]) {
2188 if (chain != NULL &&
2189 !nft_is_base_chain(chain)) {
2190 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2194 if (chain == NULL &&
2195 nla[NFTA_CHAIN_HOOK] == NULL) {
2196 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2200 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
2210 if (nla[NFTA_CHAIN_FLAGS])
2211 flags = ntohl(nla_get_be32(nla[NFTA_CHAIN_FLAGS]));
2213 flags = chain->flags;
2215 nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
2217 if (chain != NULL) {
2218 if (nlh->nlmsg_flags & NLM_F_EXCL) {
2219 NL_SET_BAD_ATTR(extack, attr);
2222 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2225 flags |= chain->flags & NFT_BASE_CHAIN;
2226 return nf_tables_updchain(&ctx, genmask, policy, flags);
2229 return nf_tables_addchain(&ctx, family, genmask, policy, flags);
2232 static int nf_tables_delchain(struct net *net, struct sock *nlsk,
2233 struct sk_buff *skb, const struct nlmsghdr *nlh,
2234 const struct nlattr * const nla[],
2235 struct netlink_ext_ack *extack)
2237 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2238 u8 genmask = nft_genmask_next(net);
2239 int family = nfmsg->nfgen_family;
2240 const struct nlattr *attr;
2241 struct nft_table *table;
2242 struct nft_chain *chain;
2243 struct nft_rule *rule;
2249 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask);
2250 if (IS_ERR(table)) {
2251 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2252 return PTR_ERR(table);
2255 if (nla[NFTA_CHAIN_HANDLE]) {
2256 attr = nla[NFTA_CHAIN_HANDLE];
2257 handle = be64_to_cpu(nla_get_be64(attr));
2258 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2260 attr = nla[NFTA_CHAIN_NAME];
2261 chain = nft_chain_lookup(net, table, attr, genmask);
2263 if (IS_ERR(chain)) {
2264 NL_SET_BAD_ATTR(extack, attr);
2265 return PTR_ERR(chain);
2268 if (nlh->nlmsg_flags & NLM_F_NONREC &&
2272 nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
2275 list_for_each_entry(rule, &chain->rules, list) {
2276 if (!nft_is_active_next(net, rule))
2280 err = nft_delrule(&ctx, rule);
2285 /* There are rules and elements that are still holding references to us,
2286 * we cannot do a recursive removal in this case.
2289 NL_SET_BAD_ATTR(extack, attr);
2293 return nft_delchain(&ctx);
2301 * nft_register_expr - register nf_tables expr type
2304 * Registers the expr type for use with nf_tables. Returns zero on
2305 * success or a negative errno code otherwise.
2307 int nft_register_expr(struct nft_expr_type *type)
2309 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2310 if (type->family == NFPROTO_UNSPEC)
2311 list_add_tail_rcu(&type->list, &nf_tables_expressions);
2313 list_add_rcu(&type->list, &nf_tables_expressions);
2314 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2317 EXPORT_SYMBOL_GPL(nft_register_expr);
2320 * nft_unregister_expr - unregister nf_tables expr type
2323 * Unregisters the expr typefor use with nf_tables.
2325 void nft_unregister_expr(struct nft_expr_type *type)
2327 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2328 list_del_rcu(&type->list);
2329 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2331 EXPORT_SYMBOL_GPL(nft_unregister_expr);
2333 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
2336 const struct nft_expr_type *type, *candidate = NULL;
2338 list_for_each_entry(type, &nf_tables_expressions, list) {
2339 if (!nla_strcmp(nla, type->name)) {
2340 if (!type->family && !candidate)
2342 else if (type->family == family)
2349 #ifdef CONFIG_MODULES
2350 static int nft_expr_type_request_module(struct net *net, u8 family,
2353 if (nft_request_module(net, "nft-expr-%u-%.*s", family,
2354 nla_len(nla), (char *)nla_data(nla)) == -EAGAIN)
2361 static const struct nft_expr_type *nft_expr_type_get(struct net *net,
2365 const struct nft_expr_type *type;
2368 return ERR_PTR(-EINVAL);
2370 type = __nft_expr_type_get(family, nla);
2371 if (type != NULL && try_module_get(type->owner))
2374 lockdep_nfnl_nft_mutex_not_held();
2375 #ifdef CONFIG_MODULES
2377 if (nft_expr_type_request_module(net, family, nla) == -EAGAIN)
2378 return ERR_PTR(-EAGAIN);
2380 if (nft_request_module(net, "nft-expr-%.*s",
2382 (char *)nla_data(nla)) == -EAGAIN)
2383 return ERR_PTR(-EAGAIN);
2386 return ERR_PTR(-ENOENT);
2389 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
2390 [NFTA_EXPR_NAME] = { .type = NLA_STRING,
2391 .len = NFT_MODULE_AUTOLOAD_LIMIT },
2392 [NFTA_EXPR_DATA] = { .type = NLA_NESTED },
2395 static int nf_tables_fill_expr_info(struct sk_buff *skb,
2396 const struct nft_expr *expr)
2398 if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
2399 goto nla_put_failure;
2401 if (expr->ops->dump) {
2402 struct nlattr *data = nla_nest_start_noflag(skb,
2405 goto nla_put_failure;
2406 if (expr->ops->dump(skb, expr) < 0)
2407 goto nla_put_failure;
2408 nla_nest_end(skb, data);
2417 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
2418 const struct nft_expr *expr)
2420 struct nlattr *nest;
2422 nest = nla_nest_start_noflag(skb, attr);
2424 goto nla_put_failure;
2425 if (nf_tables_fill_expr_info(skb, expr) < 0)
2426 goto nla_put_failure;
2427 nla_nest_end(skb, nest);
2434 struct nft_expr_info {
2435 const struct nft_expr_ops *ops;
2436 struct nlattr *tb[NFT_EXPR_MAXATTR + 1];
2439 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
2440 const struct nlattr *nla,
2441 struct nft_expr_info *info)
2443 const struct nft_expr_type *type;
2444 const struct nft_expr_ops *ops;
2445 struct nlattr *tb[NFTA_EXPR_MAX + 1];
2448 err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
2449 nft_expr_policy, NULL);
2453 type = nft_expr_type_get(ctx->net, ctx->family, tb[NFTA_EXPR_NAME]);
2455 return PTR_ERR(type);
2457 if (tb[NFTA_EXPR_DATA]) {
2458 err = nla_parse_nested_deprecated(info->tb, type->maxattr,
2460 type->policy, NULL);
2464 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
2466 if (type->select_ops != NULL) {
2467 ops = type->select_ops(ctx,
2468 (const struct nlattr * const *)info->tb);
2471 #ifdef CONFIG_MODULES
2473 if (nft_expr_type_request_module(ctx->net,
2475 tb[NFTA_EXPR_NAME]) != -EAGAIN)
2487 module_put(type->owner);
2491 static int nf_tables_newexpr(const struct nft_ctx *ctx,
2492 const struct nft_expr_info *info,
2493 struct nft_expr *expr)
2495 const struct nft_expr_ops *ops = info->ops;
2500 err = ops->init(ctx, expr, (const struct nlattr **)info->tb);
2511 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
2512 struct nft_expr *expr)
2514 const struct nft_expr_type *type = expr->ops->type;
2516 if (expr->ops->destroy)
2517 expr->ops->destroy(ctx, expr);
2518 module_put(type->owner);
2521 struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
2522 const struct nlattr *nla)
2524 struct nft_expr_info info;
2525 struct nft_expr *expr;
2526 struct module *owner;
2529 err = nf_tables_expr_parse(ctx, nla, &info);
2534 expr = kzalloc(info.ops->size, GFP_KERNEL);
2538 err = nf_tables_newexpr(ctx, &info, expr);
2546 owner = info.ops->type->owner;
2547 if (info.ops->type->release_ops)
2548 info.ops->type->release_ops(info.ops);
2552 return ERR_PTR(err);
2555 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
2557 nf_tables_expr_destroy(ctx, expr);
2565 static struct nft_rule *__nft_rule_lookup(const struct nft_chain *chain,
2568 struct nft_rule *rule;
2570 // FIXME: this sucks
2571 list_for_each_entry_rcu(rule, &chain->rules, list) {
2572 if (handle == rule->handle)
2576 return ERR_PTR(-ENOENT);
2579 static struct nft_rule *nft_rule_lookup(const struct nft_chain *chain,
2580 const struct nlattr *nla)
2583 return ERR_PTR(-EINVAL);
2585 return __nft_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
2588 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
2589 [NFTA_RULE_TABLE] = { .type = NLA_STRING,
2590 .len = NFT_TABLE_MAXNAMELEN - 1 },
2591 [NFTA_RULE_CHAIN] = { .type = NLA_STRING,
2592 .len = NFT_CHAIN_MAXNAMELEN - 1 },
2593 [NFTA_RULE_HANDLE] = { .type = NLA_U64 },
2594 [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
2595 [NFTA_RULE_COMPAT] = { .type = NLA_NESTED },
2596 [NFTA_RULE_POSITION] = { .type = NLA_U64 },
2597 [NFTA_RULE_USERDATA] = { .type = NLA_BINARY,
2598 .len = NFT_USERDATA_MAXLEN },
2599 [NFTA_RULE_ID] = { .type = NLA_U32 },
2600 [NFTA_RULE_POSITION_ID] = { .type = NLA_U32 },
2603 static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
2604 u32 portid, u32 seq, int event,
2605 u32 flags, int family,
2606 const struct nft_table *table,
2607 const struct nft_chain *chain,
2608 const struct nft_rule *rule,
2609 const struct nft_rule *prule)
2611 struct nlmsghdr *nlh;
2612 struct nfgenmsg *nfmsg;
2613 const struct nft_expr *expr, *next;
2614 struct nlattr *list;
2615 u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
2617 nlh = nlmsg_put(skb, portid, seq, type, sizeof(struct nfgenmsg), flags);
2619 goto nla_put_failure;
2621 nfmsg = nlmsg_data(nlh);
2622 nfmsg->nfgen_family = family;
2623 nfmsg->version = NFNETLINK_V0;
2624 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
2626 if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
2627 goto nla_put_failure;
2628 if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
2629 goto nla_put_failure;
2630 if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
2632 goto nla_put_failure;
2634 if (event != NFT_MSG_DELRULE && prule) {
2635 if (nla_put_be64(skb, NFTA_RULE_POSITION,
2636 cpu_to_be64(prule->handle),
2638 goto nla_put_failure;
2641 list = nla_nest_start_noflag(skb, NFTA_RULE_EXPRESSIONS);
2643 goto nla_put_failure;
2644 nft_rule_for_each_expr(expr, next, rule) {
2645 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
2646 goto nla_put_failure;
2648 nla_nest_end(skb, list);
2651 struct nft_userdata *udata = nft_userdata(rule);
2652 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
2654 goto nla_put_failure;
2657 nlmsg_end(skb, nlh);
2661 nlmsg_trim(skb, nlh);
2665 static void nf_tables_rule_notify(const struct nft_ctx *ctx,
2666 const struct nft_rule *rule, int event)
2668 struct sk_buff *skb;
2672 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
2675 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
2679 err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
2680 event, 0, ctx->family, ctx->table,
2681 ctx->chain, rule, NULL);
2687 nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
2688 ctx->report, GFP_KERNEL);
2691 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
2694 struct nft_rule_dump_ctx {
2699 static int __nf_tables_dump_rules(struct sk_buff *skb,
2701 struct netlink_callback *cb,
2702 const struct nft_table *table,
2703 const struct nft_chain *chain)
2705 struct net *net = sock_net(skb->sk);
2706 const struct nft_rule *rule, *prule;
2707 unsigned int s_idx = cb->args[0];
2710 list_for_each_entry_rcu(rule, &chain->rules, list) {
2711 if (!nft_is_active(net, rule))
2716 memset(&cb->args[1], 0,
2717 sizeof(cb->args) - sizeof(cb->args[0]));
2719 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
2722 NLM_F_MULTI | NLM_F_APPEND,
2724 table, chain, rule, prule) < 0)
2727 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
2736 static int nf_tables_dump_rules(struct sk_buff *skb,
2737 struct netlink_callback *cb)
2739 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
2740 const struct nft_rule_dump_ctx *ctx = cb->data;
2741 struct nft_table *table;
2742 const struct nft_chain *chain;
2743 unsigned int idx = 0;
2744 struct net *net = sock_net(skb->sk);
2745 int family = nfmsg->nfgen_family;
2748 cb->seq = net->nft.base_seq;
2750 list_for_each_entry_rcu(table, &net->nft.tables, list) {
2751 if (family != NFPROTO_UNSPEC && family != table->family)
2754 if (ctx && ctx->table && strcmp(ctx->table, table->name) != 0)
2757 if (ctx && ctx->table && ctx->chain) {
2758 struct rhlist_head *list, *tmp;
2760 list = rhltable_lookup(&table->chains_ht, ctx->chain,
2761 nft_chain_ht_params);
2765 rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
2766 if (!nft_is_active(net, chain))
2768 __nf_tables_dump_rules(skb, &idx,
2775 list_for_each_entry_rcu(chain, &table->chains, list) {
2776 if (__nf_tables_dump_rules(skb, &idx, cb, table, chain))
2780 if (ctx && ctx->table)
2790 static int nf_tables_dump_rules_start(struct netlink_callback *cb)
2792 const struct nlattr * const *nla = cb->data;
2793 struct nft_rule_dump_ctx *ctx = NULL;
2795 if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) {
2796 ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
2800 if (nla[NFTA_RULE_TABLE]) {
2801 ctx->table = nla_strdup(nla[NFTA_RULE_TABLE],
2808 if (nla[NFTA_RULE_CHAIN]) {
2809 ctx->chain = nla_strdup(nla[NFTA_RULE_CHAIN],
2823 static int nf_tables_dump_rules_done(struct netlink_callback *cb)
2825 struct nft_rule_dump_ctx *ctx = cb->data;
2835 /* called with rcu_read_lock held */
2836 static int nf_tables_getrule(struct net *net, struct sock *nlsk,
2837 struct sk_buff *skb, const struct nlmsghdr *nlh,
2838 const struct nlattr * const nla[],
2839 struct netlink_ext_ack *extack)
2841 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2842 u8 genmask = nft_genmask_cur(net);
2843 const struct nft_chain *chain;
2844 const struct nft_rule *rule;
2845 struct nft_table *table;
2846 struct sk_buff *skb2;
2847 int family = nfmsg->nfgen_family;
2850 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2851 struct netlink_dump_control c = {
2852 .start= nf_tables_dump_rules_start,
2853 .dump = nf_tables_dump_rules,
2854 .done = nf_tables_dump_rules_done,
2855 .module = THIS_MODULE,
2856 .data = (void *)nla,
2859 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
2862 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask);
2863 if (IS_ERR(table)) {
2864 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
2865 return PTR_ERR(table);
2868 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask);
2869 if (IS_ERR(chain)) {
2870 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
2871 return PTR_ERR(chain);
2874 rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
2876 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
2877 return PTR_ERR(rule);
2880 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
2884 err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
2885 nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
2886 family, table, chain, rule, NULL);
2890 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
2897 static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
2898 struct nft_rule *rule)
2900 struct nft_expr *expr, *next;
2903 * Careful: some expressions might not be initialized in case this
2904 * is called on error from nf_tables_newrule().
2906 expr = nft_expr_first(rule);
2907 while (expr != nft_expr_last(rule) && expr->ops) {
2908 next = nft_expr_next(expr);
2909 nf_tables_expr_destroy(ctx, expr);
2915 static void nf_tables_rule_release(const struct nft_ctx *ctx,
2916 struct nft_rule *rule)
2918 nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_RELEASE);
2919 nf_tables_rule_destroy(ctx, rule);
2922 int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain)
2924 struct nft_expr *expr, *last;
2925 const struct nft_data *data;
2926 struct nft_rule *rule;
2929 if (ctx->level == NFT_JUMP_STACK_SIZE)
2932 list_for_each_entry(rule, &chain->rules, list) {
2933 if (!nft_is_active_next(ctx->net, rule))
2936 nft_rule_for_each_expr(expr, last, rule) {
2937 if (!expr->ops->validate)
2940 err = expr->ops->validate(ctx, expr, &data);
2948 EXPORT_SYMBOL_GPL(nft_chain_validate);
2950 static int nft_table_validate(struct net *net, const struct nft_table *table)
2952 struct nft_chain *chain;
2953 struct nft_ctx ctx = {
2955 .family = table->family,
2959 list_for_each_entry(chain, &table->chains, list) {
2960 if (!nft_is_base_chain(chain))
2964 err = nft_chain_validate(&ctx, chain);
2972 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
2973 const struct nlattr *nla);
2975 #define NFT_RULE_MAXEXPRS 128
2977 static int nf_tables_newrule(struct net *net, struct sock *nlsk,
2978 struct sk_buff *skb, const struct nlmsghdr *nlh,
2979 const struct nlattr * const nla[],
2980 struct netlink_ext_ack *extack)
2982 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2983 u8 genmask = nft_genmask_next(net);
2984 struct nft_expr_info *info = NULL;
2985 int family = nfmsg->nfgen_family;
2986 struct nft_flow_rule *flow;
2987 struct nft_table *table;
2988 struct nft_chain *chain;
2989 struct nft_rule *rule, *old_rule = NULL;
2990 struct nft_userdata *udata;
2991 struct nft_trans *trans = NULL;
2992 struct nft_expr *expr;
2995 unsigned int size, i, n, ulen = 0, usize = 0;
2997 u64 handle, pos_handle;
2999 lockdep_assert_held(&net->nft.commit_mutex);
3001 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask);
3002 if (IS_ERR(table)) {
3003 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3004 return PTR_ERR(table);
3007 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask);
3008 if (IS_ERR(chain)) {
3009 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3010 return PTR_ERR(chain);
3013 if (nla[NFTA_RULE_HANDLE]) {
3014 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
3015 rule = __nft_rule_lookup(chain, handle);
3017 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3018 return PTR_ERR(rule);
3021 if (nlh->nlmsg_flags & NLM_F_EXCL) {
3022 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3025 if (nlh->nlmsg_flags & NLM_F_REPLACE)
3030 if (!(nlh->nlmsg_flags & NLM_F_CREATE) ||
3031 nlh->nlmsg_flags & NLM_F_REPLACE)
3033 handle = nf_tables_alloc_handle(table);
3035 if (chain->use == UINT_MAX)
3038 if (nla[NFTA_RULE_POSITION]) {
3039 pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
3040 old_rule = __nft_rule_lookup(chain, pos_handle);
3041 if (IS_ERR(old_rule)) {
3042 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION]);
3043 return PTR_ERR(old_rule);
3045 } else if (nla[NFTA_RULE_POSITION_ID]) {
3046 old_rule = nft_rule_lookup_byid(net, nla[NFTA_RULE_POSITION_ID]);
3047 if (IS_ERR(old_rule)) {
3048 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION_ID]);
3049 return PTR_ERR(old_rule);
3054 nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
3058 if (nla[NFTA_RULE_EXPRESSIONS]) {
3059 info = kvmalloc_array(NFT_RULE_MAXEXPRS,
3060 sizeof(struct nft_expr_info),
3065 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
3067 if (nla_type(tmp) != NFTA_LIST_ELEM)
3069 if (n == NFT_RULE_MAXEXPRS)
3071 err = nf_tables_expr_parse(&ctx, tmp, &info[n]);
3074 size += info[n].ops->size;
3078 /* Check for overflow of dlen field */
3080 if (size >= 1 << 12)
3083 if (nla[NFTA_RULE_USERDATA]) {
3084 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
3086 usize = sizeof(struct nft_userdata) + ulen;
3090 rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL);
3094 nft_activate_next(net, rule);
3096 rule->handle = handle;
3098 rule->udata = ulen ? 1 : 0;
3101 udata = nft_userdata(rule);
3102 udata->len = ulen - 1;
3103 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
3106 expr = nft_expr_first(rule);
3107 for (i = 0; i < n; i++) {
3108 err = nf_tables_newexpr(&ctx, &info[i], expr);
3112 if (info[i].ops->validate)
3113 nft_validate_state_update(net, NFT_VALIDATE_NEED);
3116 expr = nft_expr_next(expr);
3119 if (nlh->nlmsg_flags & NLM_F_REPLACE) {
3120 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
3121 if (trans == NULL) {
3125 err = nft_delrule(&ctx, old_rule);
3127 nft_trans_destroy(trans);
3131 list_add_tail_rcu(&rule->list, &old_rule->list);
3133 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
3139 if (nlh->nlmsg_flags & NLM_F_APPEND) {
3141 list_add_rcu(&rule->list, &old_rule->list);
3143 list_add_tail_rcu(&rule->list, &chain->rules);
3146 list_add_tail_rcu(&rule->list, &old_rule->list);
3148 list_add_rcu(&rule->list, &chain->rules);
3154 if (net->nft.validate_state == NFT_VALIDATE_DO)
3155 return nft_table_validate(net, table);
3157 if (chain->flags & NFT_CHAIN_HW_OFFLOAD) {
3158 flow = nft_flow_rule_create(net, rule);
3160 return PTR_ERR(flow);
3162 nft_trans_flow_rule(trans) = flow;
3167 nf_tables_rule_release(&ctx, rule);
3169 for (i = 0; i < n; i++) {
3171 module_put(info[i].ops->type->owner);
3172 if (info[i].ops->type->release_ops)
3173 info[i].ops->type->release_ops(info[i].ops);
3180 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3181 const struct nlattr *nla)
3183 u32 id = ntohl(nla_get_be32(nla));
3184 struct nft_trans *trans;
3186 list_for_each_entry(trans, &net->nft.commit_list, list) {
3187 struct nft_rule *rule = nft_trans_rule(trans);
3189 if (trans->msg_type == NFT_MSG_NEWRULE &&
3190 id == nft_trans_rule_id(trans))
3193 return ERR_PTR(-ENOENT);
3196 static int nf_tables_delrule(struct net *net, struct sock *nlsk,
3197 struct sk_buff *skb, const struct nlmsghdr *nlh,
3198 const struct nlattr * const nla[],
3199 struct netlink_ext_ack *extack)
3201 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3202 u8 genmask = nft_genmask_next(net);
3203 struct nft_table *table;
3204 struct nft_chain *chain = NULL;
3205 struct nft_rule *rule;
3206 int family = nfmsg->nfgen_family, err = 0;
3209 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask);
3210 if (IS_ERR(table)) {
3211 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3212 return PTR_ERR(table);
3215 if (nla[NFTA_RULE_CHAIN]) {
3216 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3218 if (IS_ERR(chain)) {
3219 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3220 return PTR_ERR(chain);
3224 nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
3227 if (nla[NFTA_RULE_HANDLE]) {
3228 rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
3230 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3231 return PTR_ERR(rule);
3234 err = nft_delrule(&ctx, rule);
3235 } else if (nla[NFTA_RULE_ID]) {
3236 rule = nft_rule_lookup_byid(net, nla[NFTA_RULE_ID]);
3238 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_ID]);
3239 return PTR_ERR(rule);
3242 err = nft_delrule(&ctx, rule);
3244 err = nft_delrule_by_chain(&ctx);
3247 list_for_each_entry(chain, &table->chains, list) {
3248 if (!nft_is_active_next(net, chain))
3252 err = nft_delrule_by_chain(&ctx);
3265 static LIST_HEAD(nf_tables_set_types);
3267 int nft_register_set(struct nft_set_type *type)
3269 nfnl_lock(NFNL_SUBSYS_NFTABLES);
3270 list_add_tail_rcu(&type->list, &nf_tables_set_types);
3271 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
3274 EXPORT_SYMBOL_GPL(nft_register_set);
3276 void nft_unregister_set(struct nft_set_type *type)
3278 nfnl_lock(NFNL_SUBSYS_NFTABLES);
3279 list_del_rcu(&type->list);
3280 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
3282 EXPORT_SYMBOL_GPL(nft_unregister_set);
3284 #define NFT_SET_FEATURES (NFT_SET_INTERVAL | NFT_SET_MAP | \
3285 NFT_SET_TIMEOUT | NFT_SET_OBJECT | \
3288 static bool nft_set_ops_candidate(const struct nft_set_type *type, u32 flags)
3290 return (flags & type->features) == (flags & NFT_SET_FEATURES);
3294 * Select a set implementation based on the data characteristics and the
3295 * given policy. The total memory use might not be known if no size is
3296 * given, in that case the amount of memory per element is used.
3298 static const struct nft_set_ops *
3299 nft_select_set_ops(const struct nft_ctx *ctx,
3300 const struct nlattr * const nla[],
3301 const struct nft_set_desc *desc,
3302 enum nft_set_policies policy)
3304 const struct nft_set_ops *ops, *bops;
3305 struct nft_set_estimate est, best;
3306 const struct nft_set_type *type;
3309 lockdep_assert_held(&ctx->net->nft.commit_mutex);
3310 lockdep_nfnl_nft_mutex_not_held();
3311 #ifdef CONFIG_MODULES
3312 if (list_empty(&nf_tables_set_types)) {
3313 if (nft_request_module(ctx->net, "nft-set") == -EAGAIN)
3314 return ERR_PTR(-EAGAIN);
3317 if (nla[NFTA_SET_FLAGS] != NULL)
3318 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
3325 list_for_each_entry(type, &nf_tables_set_types, list) {
3328 if (!nft_set_ops_candidate(type, flags))
3330 if (!ops->estimate(desc, flags, &est))
3334 case NFT_SET_POL_PERFORMANCE:
3335 if (est.lookup < best.lookup)
3337 if (est.lookup == best.lookup &&
3338 est.space < best.space)
3341 case NFT_SET_POL_MEMORY:
3343 if (est.space < best.space)
3345 if (est.space == best.space &&
3346 est.lookup < best.lookup)
3348 } else if (est.size < best.size || !bops) {
3356 if (!try_module_get(type->owner))
3359 module_put(to_set_type(bops)->owner);
3368 return ERR_PTR(-EOPNOTSUPP);
3371 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
3372 [NFTA_SET_TABLE] = { .type = NLA_STRING,
3373 .len = NFT_TABLE_MAXNAMELEN - 1 },
3374 [NFTA_SET_NAME] = { .type = NLA_STRING,
3375 .len = NFT_SET_MAXNAMELEN - 1 },
3376 [NFTA_SET_FLAGS] = { .type = NLA_U32 },
3377 [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 },
3378 [NFTA_SET_KEY_LEN] = { .type = NLA_U32 },
3379 [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 },
3380 [NFTA_SET_DATA_LEN] = { .type = NLA_U32 },
3381 [NFTA_SET_POLICY] = { .type = NLA_U32 },
3382 [NFTA_SET_DESC] = { .type = NLA_NESTED },
3383 [NFTA_SET_ID] = { .type = NLA_U32 },
3384 [NFTA_SET_TIMEOUT] = { .type = NLA_U64 },
3385 [NFTA_SET_GC_INTERVAL] = { .type = NLA_U32 },
3386 [NFTA_SET_USERDATA] = { .type = NLA_BINARY,
3387 .len = NFT_USERDATA_MAXLEN },
3388 [NFTA_SET_OBJ_TYPE] = { .type = NLA_U32 },
3389 [NFTA_SET_HANDLE] = { .type = NLA_U64 },
3392 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
3393 [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 },
3396 static int nft_ctx_init_from_setattr(struct nft_ctx *ctx, struct net *net,
3397 const struct sk_buff *skb,
3398 const struct nlmsghdr *nlh,
3399 const struct nlattr * const nla[],
3400 struct netlink_ext_ack *extack,
3403 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3404 int family = nfmsg->nfgen_family;
3405 struct nft_table *table = NULL;
3407 if (nla[NFTA_SET_TABLE] != NULL) {
3408 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
3410 if (IS_ERR(table)) {
3411 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
3412 return PTR_ERR(table);
3416 nft_ctx_init(ctx, net, skb, nlh, family, table, NULL, nla);
3420 static struct nft_set *nft_set_lookup(const struct nft_table *table,
3421 const struct nlattr *nla, u8 genmask)
3423 struct nft_set *set;
3426 return ERR_PTR(-EINVAL);
3428 list_for_each_entry_rcu(set, &table->sets, list) {
3429 if (!nla_strcmp(nla, set->name) &&
3430 nft_active_genmask(set, genmask))
3433 return ERR_PTR(-ENOENT);
3436 static struct nft_set *nft_set_lookup_byhandle(const struct nft_table *table,
3437 const struct nlattr *nla,
3440 struct nft_set *set;
3442 list_for_each_entry(set, &table->sets, list) {
3443 if (be64_to_cpu(nla_get_be64(nla)) == set->handle &&
3444 nft_active_genmask(set, genmask))
3447 return ERR_PTR(-ENOENT);
3450 static struct nft_set *nft_set_lookup_byid(const struct net *net,
3451 const struct nlattr *nla, u8 genmask)
3453 struct nft_trans *trans;
3454 u32 id = ntohl(nla_get_be32(nla));
3456 list_for_each_entry(trans, &net->nft.commit_list, list) {
3457 if (trans->msg_type == NFT_MSG_NEWSET) {
3458 struct nft_set *set = nft_trans_set(trans);
3460 if (id == nft_trans_set_id(trans) &&
3461 nft_active_genmask(set, genmask))
3465 return ERR_PTR(-ENOENT);
3468 struct nft_set *nft_set_lookup_global(const struct net *net,
3469 const struct nft_table *table,
3470 const struct nlattr *nla_set_name,
3471 const struct nlattr *nla_set_id,
3474 struct nft_set *set;
3476 set = nft_set_lookup(table, nla_set_name, genmask);
3481 set = nft_set_lookup_byid(net, nla_set_id, genmask);
3485 EXPORT_SYMBOL_GPL(nft_set_lookup_global);
3487 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
3490 const struct nft_set *i;
3492 unsigned long *inuse;
3493 unsigned int n = 0, min = 0;
3495 p = strchr(name, '%');
3497 if (p[1] != 'd' || strchr(p + 2, '%'))
3500 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
3504 list_for_each_entry(i, &ctx->table->sets, list) {
3507 if (!nft_is_active_next(ctx->net, set))
3509 if (!sscanf(i->name, name, &tmp))
3511 if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
3514 set_bit(tmp - min, inuse);
3517 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
3518 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
3519 min += BITS_PER_BYTE * PAGE_SIZE;
3520 memset(inuse, 0, PAGE_SIZE);
3523 free_page((unsigned long)inuse);
3526 set->name = kasprintf(GFP_KERNEL, name, min + n);
3530 list_for_each_entry(i, &ctx->table->sets, list) {
3531 if (!nft_is_active_next(ctx->net, i))
3533 if (!strcmp(set->name, i->name)) {
3541 static int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result)
3543 u64 ms = be64_to_cpu(nla_get_be64(nla));
3544 u64 max = (u64)(~((u64)0));
3546 max = div_u64(max, NSEC_PER_MSEC);
3550 ms *= NSEC_PER_MSEC;
3551 *result = nsecs_to_jiffies64(ms);
3555 static __be64 nf_jiffies64_to_msecs(u64 input)
3557 return cpu_to_be64(jiffies64_to_msecs(input));
3560 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
3561 const struct nft_set *set, u16 event, u16 flags)
3563 struct nfgenmsg *nfmsg;
3564 struct nlmsghdr *nlh;
3565 struct nlattr *desc;
3566 u32 portid = ctx->portid;
3569 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
3570 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3573 goto nla_put_failure;
3575 nfmsg = nlmsg_data(nlh);
3576 nfmsg->nfgen_family = ctx->family;
3577 nfmsg->version = NFNETLINK_V0;
3578 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
3580 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
3581 goto nla_put_failure;
3582 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
3583 goto nla_put_failure;
3584 if (nla_put_be64(skb, NFTA_SET_HANDLE, cpu_to_be64(set->handle),
3586 goto nla_put_failure;
3587 if (set->flags != 0)
3588 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
3589 goto nla_put_failure;
3591 if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
3592 goto nla_put_failure;
3593 if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
3594 goto nla_put_failure;
3595 if (set->flags & NFT_SET_MAP) {
3596 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
3597 goto nla_put_failure;
3598 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
3599 goto nla_put_failure;
3601 if (set->flags & NFT_SET_OBJECT &&
3602 nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
3603 goto nla_put_failure;
3606 nla_put_be64(skb, NFTA_SET_TIMEOUT,
3607 nf_jiffies64_to_msecs(set->timeout),
3609 goto nla_put_failure;
3611 nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(set->gc_int)))
3612 goto nla_put_failure;
3614 if (set->policy != NFT_SET_POL_PERFORMANCE) {
3615 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
3616 goto nla_put_failure;
3619 if (nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
3620 goto nla_put_failure;
3622 desc = nla_nest_start_noflag(skb, NFTA_SET_DESC);
3624 goto nla_put_failure;
3626 nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
3627 goto nla_put_failure;
3628 nla_nest_end(skb, desc);
3630 nlmsg_end(skb, nlh);
3634 nlmsg_trim(skb, nlh);
3638 static void nf_tables_set_notify(const struct nft_ctx *ctx,
3639 const struct nft_set *set, int event,
3642 struct sk_buff *skb;
3643 u32 portid = ctx->portid;
3647 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
3650 skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
3654 err = nf_tables_fill_set(skb, ctx, set, event, 0);
3660 nfnetlink_send(skb, ctx->net, portid, NFNLGRP_NFTABLES, ctx->report,
3664 nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
3667 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
3669 const struct nft_set *set;
3670 unsigned int idx, s_idx = cb->args[0];
3671 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
3672 struct net *net = sock_net(skb->sk);
3673 struct nft_ctx *ctx = cb->data, ctx_set;
3679 cb->seq = net->nft.base_seq;
3681 list_for_each_entry_rcu(table, &net->nft.tables, list) {
3682 if (ctx->family != NFPROTO_UNSPEC &&
3683 ctx->family != table->family)
3686 if (ctx->table && ctx->table != table)
3690 if (cur_table != table)
3696 list_for_each_entry_rcu(set, &table->sets, list) {
3699 if (!nft_is_active(net, set))
3703 ctx_set.table = table;
3704 ctx_set.family = table->family;
3706 if (nf_tables_fill_set(skb, &ctx_set, set,
3710 cb->args[2] = (unsigned long) table;
3713 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3726 static int nf_tables_dump_sets_start(struct netlink_callback *cb)
3728 struct nft_ctx *ctx_dump = NULL;
3730 ctx_dump = kmemdup(cb->data, sizeof(*ctx_dump), GFP_ATOMIC);
3731 if (ctx_dump == NULL)
3734 cb->data = ctx_dump;
3738 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
3744 /* called with rcu_read_lock held */
3745 static int nf_tables_getset(struct net *net, struct sock *nlsk,
3746 struct sk_buff *skb, const struct nlmsghdr *nlh,
3747 const struct nlattr * const nla[],
3748 struct netlink_ext_ack *extack)
3750 u8 genmask = nft_genmask_cur(net);
3751 const struct nft_set *set;
3753 struct sk_buff *skb2;
3754 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3757 /* Verify existence before starting dump */
3758 err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, extack,
3763 if (nlh->nlmsg_flags & NLM_F_DUMP) {
3764 struct netlink_dump_control c = {
3765 .start = nf_tables_dump_sets_start,
3766 .dump = nf_tables_dump_sets,
3767 .done = nf_tables_dump_sets_done,
3769 .module = THIS_MODULE,
3772 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
3775 /* Only accept unspec with dump */
3776 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
3777 return -EAFNOSUPPORT;
3778 if (!nla[NFTA_SET_TABLE])
3781 set = nft_set_lookup(ctx.table, nla[NFTA_SET_NAME], genmask);
3783 return PTR_ERR(set);
3785 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
3789 err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
3793 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
3800 static int nf_tables_set_desc_parse(struct nft_set_desc *desc,
3801 const struct nlattr *nla)
3803 struct nlattr *da[NFTA_SET_DESC_MAX + 1];
3806 err = nla_parse_nested_deprecated(da, NFTA_SET_DESC_MAX, nla,
3807 nft_set_desc_policy, NULL);
3811 if (da[NFTA_SET_DESC_SIZE] != NULL)
3812 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
3817 static int nf_tables_newset(struct net *net, struct sock *nlsk,
3818 struct sk_buff *skb, const struct nlmsghdr *nlh,
3819 const struct nlattr * const nla[],
3820 struct netlink_ext_ack *extack)
3822 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3823 u8 genmask = nft_genmask_next(net);
3824 int family = nfmsg->nfgen_family;
3825 const struct nft_set_ops *ops;
3826 struct nft_table *table;
3827 struct nft_set *set;
3832 u32 ktype, dtype, flags, policy, gc_int, objtype;
3833 struct nft_set_desc desc;
3834 unsigned char *udata;
3838 if (nla[NFTA_SET_TABLE] == NULL ||
3839 nla[NFTA_SET_NAME] == NULL ||
3840 nla[NFTA_SET_KEY_LEN] == NULL ||
3841 nla[NFTA_SET_ID] == NULL)
3844 memset(&desc, 0, sizeof(desc));
3846 ktype = NFT_DATA_VALUE;
3847 if (nla[NFTA_SET_KEY_TYPE] != NULL) {
3848 ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
3849 if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
3853 desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
3854 if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
3858 if (nla[NFTA_SET_FLAGS] != NULL) {
3859 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
3860 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
3861 NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
3862 NFT_SET_MAP | NFT_SET_EVAL |
3865 /* Only one of these operations is supported */
3866 if ((flags & (NFT_SET_MAP | NFT_SET_OBJECT)) ==
3867 (NFT_SET_MAP | NFT_SET_OBJECT))
3869 if ((flags & (NFT_SET_EVAL | NFT_SET_OBJECT)) ==
3870 (NFT_SET_EVAL | NFT_SET_OBJECT))
3875 if (nla[NFTA_SET_DATA_TYPE] != NULL) {
3876 if (!(flags & NFT_SET_MAP))
3879 dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
3880 if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
3881 dtype != NFT_DATA_VERDICT)
3884 if (dtype != NFT_DATA_VERDICT) {
3885 if (nla[NFTA_SET_DATA_LEN] == NULL)
3887 desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
3888 if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
3891 desc.dlen = sizeof(struct nft_verdict);
3892 } else if (flags & NFT_SET_MAP)
3895 if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
3896 if (!(flags & NFT_SET_OBJECT))
3899 objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
3900 if (objtype == NFT_OBJECT_UNSPEC ||
3901 objtype > NFT_OBJECT_MAX)
3903 } else if (flags & NFT_SET_OBJECT)
3906 objtype = NFT_OBJECT_UNSPEC;
3909 if (nla[NFTA_SET_TIMEOUT] != NULL) {
3910 if (!(flags & NFT_SET_TIMEOUT))
3913 err = nf_msecs_to_jiffies64(nla[NFTA_SET_TIMEOUT], &timeout);
3918 if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
3919 if (!(flags & NFT_SET_TIMEOUT))
3921 gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
3924 policy = NFT_SET_POL_PERFORMANCE;
3925 if (nla[NFTA_SET_POLICY] != NULL)
3926 policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
3928 if (nla[NFTA_SET_DESC] != NULL) {
3929 err = nf_tables_set_desc_parse(&desc, nla[NFTA_SET_DESC]);
3934 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, genmask);
3935 if (IS_ERR(table)) {
3936 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
3937 return PTR_ERR(table);
3940 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
3942 set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
3944 if (PTR_ERR(set) != -ENOENT) {
3945 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
3946 return PTR_ERR(set);
3949 if (nlh->nlmsg_flags & NLM_F_EXCL) {
3950 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
3953 if (nlh->nlmsg_flags & NLM_F_REPLACE)
3959 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
3962 ops = nft_select_set_ops(&ctx, nla, &desc, policy);
3964 return PTR_ERR(ops);
3967 if (nla[NFTA_SET_USERDATA])
3968 udlen = nla_len(nla[NFTA_SET_USERDATA]);
3971 if (ops->privsize != NULL)
3972 size = ops->privsize(nla, &desc);
3974 set = kvzalloc(sizeof(*set) + size + udlen, GFP_KERNEL);
3980 name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL);
3986 err = nf_tables_set_alloc_name(&ctx, set, name);
3993 udata = set->data + size;
3994 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
3997 INIT_LIST_HEAD(&set->bindings);
3999 write_pnet(&set->net, net);
4002 set->klen = desc.klen;
4004 set->objtype = objtype;
4005 set->dlen = desc.dlen;
4007 set->size = desc.size;
4008 set->policy = policy;
4011 set->timeout = timeout;
4012 set->gc_int = gc_int;
4013 set->handle = nf_tables_alloc_handle(table);
4015 err = ops->init(set, &desc, nla);
4019 err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
4023 list_add_tail_rcu(&set->list, &table->sets);
4034 module_put(to_set_type(ops)->owner);
4038 static void nft_set_destroy(struct nft_set *set)
4040 if (WARN_ON(set->use > 0))
4043 set->ops->destroy(set);
4044 module_put(to_set_type(set->ops)->owner);
4049 static int nf_tables_delset(struct net *net, struct sock *nlsk,
4050 struct sk_buff *skb, const struct nlmsghdr *nlh,
4051 const struct nlattr * const nla[],
4052 struct netlink_ext_ack *extack)
4054 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4055 u8 genmask = nft_genmask_next(net);
4056 const struct nlattr *attr;
4057 struct nft_set *set;
4061 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
4062 return -EAFNOSUPPORT;
4063 if (nla[NFTA_SET_TABLE] == NULL)
4066 err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, extack,
4071 if (nla[NFTA_SET_HANDLE]) {
4072 attr = nla[NFTA_SET_HANDLE];
4073 set = nft_set_lookup_byhandle(ctx.table, attr, genmask);
4075 attr = nla[NFTA_SET_NAME];
4076 set = nft_set_lookup(ctx.table, attr, genmask);
4080 NL_SET_BAD_ATTR(extack, attr);
4081 return PTR_ERR(set);
4084 (nlh->nlmsg_flags & NLM_F_NONREC && atomic_read(&set->nelems) > 0)) {
4085 NL_SET_BAD_ATTR(extack, attr);
4089 return nft_delset(&ctx, set);
4092 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
4093 struct nft_set *set,
4094 const struct nft_set_iter *iter,
4095 struct nft_set_elem *elem)
4097 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4098 enum nft_registers dreg;
4100 dreg = nft_type_to_reg(set->dtype);
4101 return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
4102 set->dtype == NFT_DATA_VERDICT ?
4103 NFT_DATA_VERDICT : NFT_DATA_VALUE,
4107 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
4108 struct nft_set_binding *binding)
4110 struct nft_set_binding *i;
4111 struct nft_set_iter iter;
4113 if (set->use == UINT_MAX)
4116 if (!list_empty(&set->bindings) && nft_set_is_anonymous(set))
4119 if (binding->flags & NFT_SET_MAP) {
4120 /* If the set is already bound to the same chain all
4121 * jumps are already validated for that chain.
4123 list_for_each_entry(i, &set->bindings, list) {
4124 if (i->flags & NFT_SET_MAP &&
4125 i->chain == binding->chain)
4129 iter.genmask = nft_genmask_next(ctx->net);
4133 iter.fn = nf_tables_bind_check_setelem;
4135 set->ops->walk(ctx, set, &iter);
4140 binding->chain = ctx->chain;
4141 list_add_tail_rcu(&binding->list, &set->bindings);
4142 nft_set_trans_bind(ctx, set);
4147 EXPORT_SYMBOL_GPL(nf_tables_bind_set);
4149 static void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
4150 struct nft_set_binding *binding, bool event)
4152 list_del_rcu(&binding->list);
4154 if (list_empty(&set->bindings) && nft_set_is_anonymous(set)) {
4155 list_del_rcu(&set->list);
4157 nf_tables_set_notify(ctx, set, NFT_MSG_DELSET,
4162 void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set,
4163 struct nft_set_binding *binding,
4164 enum nft_trans_phase phase)
4167 case NFT_TRANS_PREPARE:
4170 case NFT_TRANS_ABORT:
4171 case NFT_TRANS_RELEASE:
4175 nf_tables_unbind_set(ctx, set, binding,
4176 phase == NFT_TRANS_COMMIT);
4179 EXPORT_SYMBOL_GPL(nf_tables_deactivate_set);
4181 void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set)
4183 if (list_empty(&set->bindings) && nft_set_is_anonymous(set))
4184 nft_set_destroy(set);
4186 EXPORT_SYMBOL_GPL(nf_tables_destroy_set);
4188 const struct nft_set_ext_type nft_set_ext_types[] = {
4189 [NFT_SET_EXT_KEY] = {
4190 .align = __alignof__(u32),
4192 [NFT_SET_EXT_DATA] = {
4193 .align = __alignof__(u32),
4195 [NFT_SET_EXT_EXPR] = {
4196 .align = __alignof__(struct nft_expr),
4198 [NFT_SET_EXT_OBJREF] = {
4199 .len = sizeof(struct nft_object *),
4200 .align = __alignof__(struct nft_object *),
4202 [NFT_SET_EXT_FLAGS] = {
4204 .align = __alignof__(u8),
4206 [NFT_SET_EXT_TIMEOUT] = {
4208 .align = __alignof__(u64),
4210 [NFT_SET_EXT_EXPIRATION] = {
4212 .align = __alignof__(u64),
4214 [NFT_SET_EXT_USERDATA] = {
4215 .len = sizeof(struct nft_userdata),
4216 .align = __alignof__(struct nft_userdata),
4219 EXPORT_SYMBOL_GPL(nft_set_ext_types);
4225 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
4226 [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED },
4227 [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED },
4228 [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 },
4229 [NFTA_SET_ELEM_TIMEOUT] = { .type = NLA_U64 },
4230 [NFTA_SET_ELEM_EXPIRATION] = { .type = NLA_U64 },
4231 [NFTA_SET_ELEM_USERDATA] = { .type = NLA_BINARY,
4232 .len = NFT_USERDATA_MAXLEN },
4233 [NFTA_SET_ELEM_EXPR] = { .type = NLA_NESTED },
4234 [NFTA_SET_ELEM_OBJREF] = { .type = NLA_STRING,
4235 .len = NFT_OBJ_MAXNAMELEN - 1 },
4238 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
4239 [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING,
4240 .len = NFT_TABLE_MAXNAMELEN - 1 },
4241 [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING,
4242 .len = NFT_SET_MAXNAMELEN - 1 },
4243 [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED },
4244 [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 },
4247 static int nft_ctx_init_from_elemattr(struct nft_ctx *ctx, struct net *net,
4248 const struct sk_buff *skb,
4249 const struct nlmsghdr *nlh,
4250 const struct nlattr * const nla[],
4251 struct netlink_ext_ack *extack,
4254 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4255 int family = nfmsg->nfgen_family;
4256 struct nft_table *table;
4258 table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
4260 if (IS_ERR(table)) {
4261 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
4262 return PTR_ERR(table);
4265 nft_ctx_init(ctx, net, skb, nlh, family, table, NULL, nla);
4269 static int nf_tables_fill_setelem(struct sk_buff *skb,
4270 const struct nft_set *set,
4271 const struct nft_set_elem *elem)
4273 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4274 unsigned char *b = skb_tail_pointer(skb);
4275 struct nlattr *nest;
4277 nest = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
4279 goto nla_put_failure;
4281 if (nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
4282 NFT_DATA_VALUE, set->klen) < 0)
4283 goto nla_put_failure;
4285 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
4286 nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
4287 set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
4289 goto nla_put_failure;
4291 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR) &&
4292 nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, nft_set_ext_expr(ext)) < 0)
4293 goto nla_put_failure;
4295 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
4296 nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
4297 (*nft_set_ext_obj(ext))->key.name) < 0)
4298 goto nla_put_failure;
4300 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
4301 nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
4302 htonl(*nft_set_ext_flags(ext))))
4303 goto nla_put_failure;
4305 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
4306 nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
4307 nf_jiffies64_to_msecs(*nft_set_ext_timeout(ext)),
4309 goto nla_put_failure;
4311 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
4312 u64 expires, now = get_jiffies_64();
4314 expires = *nft_set_ext_expiration(ext);
4315 if (time_before64(now, expires))
4320 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
4321 nf_jiffies64_to_msecs(expires),
4323 goto nla_put_failure;
4326 if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
4327 struct nft_userdata *udata;
4329 udata = nft_set_ext_userdata(ext);
4330 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
4331 udata->len + 1, udata->data))
4332 goto nla_put_failure;
4335 nla_nest_end(skb, nest);
4343 struct nft_set_dump_args {
4344 const struct netlink_callback *cb;
4345 struct nft_set_iter iter;
4346 struct sk_buff *skb;
4349 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
4350 struct nft_set *set,
4351 const struct nft_set_iter *iter,
4352 struct nft_set_elem *elem)
4354 struct nft_set_dump_args *args;
4356 args = container_of(iter, struct nft_set_dump_args, iter);
4357 return nf_tables_fill_setelem(args->skb, set, elem);
4360 struct nft_set_dump_ctx {
4361 const struct nft_set *set;
4365 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
4367 struct nft_set_dump_ctx *dump_ctx = cb->data;
4368 struct net *net = sock_net(skb->sk);
4369 struct nft_table *table;
4370 struct nft_set *set;
4371 struct nft_set_dump_args args;
4372 bool set_found = false;
4373 struct nfgenmsg *nfmsg;
4374 struct nlmsghdr *nlh;
4375 struct nlattr *nest;
4380 list_for_each_entry_rcu(table, &net->nft.tables, list) {
4381 if (dump_ctx->ctx.family != NFPROTO_UNSPEC &&
4382 dump_ctx->ctx.family != table->family)
4385 if (table != dump_ctx->ctx.table)
4388 list_for_each_entry_rcu(set, &table->sets, list) {
4389 if (set == dump_ctx->set) {
4402 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM);
4403 portid = NETLINK_CB(cb->skb).portid;
4404 seq = cb->nlh->nlmsg_seq;
4406 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
4409 goto nla_put_failure;
4411 nfmsg = nlmsg_data(nlh);
4412 nfmsg->nfgen_family = table->family;
4413 nfmsg->version = NFNETLINK_V0;
4414 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
4416 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name))
4417 goto nla_put_failure;
4418 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
4419 goto nla_put_failure;
4421 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
4423 goto nla_put_failure;
4427 args.iter.genmask = nft_genmask_cur(net);
4428 args.iter.skip = cb->args[0];
4429 args.iter.count = 0;
4431 args.iter.fn = nf_tables_dump_setelem;
4432 set->ops->walk(&dump_ctx->ctx, set, &args.iter);
4435 nla_nest_end(skb, nest);
4436 nlmsg_end(skb, nlh);
4438 if (args.iter.err && args.iter.err != -EMSGSIZE)
4439 return args.iter.err;
4440 if (args.iter.count == cb->args[0])
4443 cb->args[0] = args.iter.count;
4451 static int nf_tables_dump_set_start(struct netlink_callback *cb)
4453 struct nft_set_dump_ctx *dump_ctx = cb->data;
4455 cb->data = kmemdup(dump_ctx, sizeof(*dump_ctx), GFP_ATOMIC);
4457 return cb->data ? 0 : -ENOMEM;
4460 static int nf_tables_dump_set_done(struct netlink_callback *cb)
4466 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
4467 const struct nft_ctx *ctx, u32 seq,
4468 u32 portid, int event, u16 flags,
4469 const struct nft_set *set,
4470 const struct nft_set_elem *elem)
4472 struct nfgenmsg *nfmsg;
4473 struct nlmsghdr *nlh;
4474 struct nlattr *nest;
4477 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
4478 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
4481 goto nla_put_failure;
4483 nfmsg = nlmsg_data(nlh);
4484 nfmsg->nfgen_family = ctx->family;
4485 nfmsg->version = NFNETLINK_V0;
4486 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
4488 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
4489 goto nla_put_failure;
4490 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
4491 goto nla_put_failure;
4493 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
4495 goto nla_put_failure;
4497 err = nf_tables_fill_setelem(skb, set, elem);
4499 goto nla_put_failure;
4501 nla_nest_end(skb, nest);
4503 nlmsg_end(skb, nlh);
4507 nlmsg_trim(skb, nlh);
4511 static int nft_setelem_parse_flags(const struct nft_set *set,
4512 const struct nlattr *attr, u32 *flags)
4517 *flags = ntohl(nla_get_be32(attr));
4518 if (*flags & ~NFT_SET_ELEM_INTERVAL_END)
4520 if (!(set->flags & NFT_SET_INTERVAL) &&
4521 *flags & NFT_SET_ELEM_INTERVAL_END)
4527 static int nft_get_set_elem(struct nft_ctx *ctx, struct nft_set *set,
4528 const struct nlattr *attr)
4530 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
4531 struct nft_data_desc desc;
4532 struct nft_set_elem elem;
4533 struct sk_buff *skb;
4538 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
4539 nft_set_elem_policy, NULL);
4543 if (!nla[NFTA_SET_ELEM_KEY])
4546 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
4550 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &desc,
4551 nla[NFTA_SET_ELEM_KEY]);
4556 if (desc.type != NFT_DATA_VALUE || desc.len != set->klen) {
4557 nft_data_release(&elem.key.val, desc.type);
4561 priv = set->ops->get(ctx->net, set, &elem, flags);
4563 return PTR_ERR(priv);
4568 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
4572 err = nf_tables_fill_setelem_info(skb, ctx, ctx->seq, ctx->portid,
4573 NFT_MSG_NEWSETELEM, 0, set, &elem);
4577 err = nfnetlink_unicast(skb, ctx->net, ctx->portid, MSG_DONTWAIT);
4578 /* This avoids a loop in nfnetlink. */
4586 /* this avoids a loop in nfnetlink. */
4587 return err == -EAGAIN ? -ENOBUFS : err;
4590 /* called with rcu_read_lock held */
4591 static int nf_tables_getsetelem(struct net *net, struct sock *nlsk,
4592 struct sk_buff *skb, const struct nlmsghdr *nlh,
4593 const struct nlattr * const nla[],
4594 struct netlink_ext_ack *extack)
4596 u8 genmask = nft_genmask_cur(net);
4597 struct nft_set *set;
4598 struct nlattr *attr;
4602 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack,
4607 set = nft_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
4609 return PTR_ERR(set);
4611 if (nlh->nlmsg_flags & NLM_F_DUMP) {
4612 struct netlink_dump_control c = {
4613 .start = nf_tables_dump_set_start,
4614 .dump = nf_tables_dump_set,
4615 .done = nf_tables_dump_set_done,
4616 .module = THIS_MODULE,
4618 struct nft_set_dump_ctx dump_ctx = {
4624 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
4627 if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
4630 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
4631 err = nft_get_set_elem(&ctx, set, attr);
4639 static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
4640 const struct nft_set *set,
4641 const struct nft_set_elem *elem,
4642 int event, u16 flags)
4644 struct net *net = ctx->net;
4645 u32 portid = ctx->portid;
4646 struct sk_buff *skb;
4649 if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
4652 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
4656 err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
4663 nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, ctx->report,
4667 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
4670 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
4672 struct nft_set *set)
4674 struct nft_trans *trans;
4676 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
4680 nft_trans_elem_set(trans) = set;
4684 void *nft_set_elem_init(const struct nft_set *set,
4685 const struct nft_set_ext_tmpl *tmpl,
4686 const u32 *key, const u32 *data,
4687 u64 timeout, u64 expiration, gfp_t gfp)
4689 struct nft_set_ext *ext;
4692 elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
4696 ext = nft_set_elem_ext(set, elem);
4697 nft_set_ext_init(ext, tmpl);
4699 memcpy(nft_set_ext_key(ext), key, set->klen);
4700 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
4701 memcpy(nft_set_ext_data(ext), data, set->dlen);
4702 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
4703 *nft_set_ext_expiration(ext) = get_jiffies_64() + expiration;
4704 if (expiration == 0)
4705 *nft_set_ext_expiration(ext) += timeout;
4707 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
4708 *nft_set_ext_timeout(ext) = timeout;
4713 void nft_set_elem_destroy(const struct nft_set *set, void *elem,
4716 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
4717 struct nft_ctx ctx = {
4718 .net = read_pnet(&set->net),
4719 .family = set->table->family,
4722 nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE);
4723 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
4724 nft_data_release(nft_set_ext_data(ext), set->dtype);
4725 if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPR)) {
4726 struct nft_expr *expr = nft_set_ext_expr(ext);
4728 if (expr->ops->destroy_clone) {
4729 expr->ops->destroy_clone(&ctx, expr);
4730 module_put(expr->ops->type->owner);
4732 nf_tables_expr_destroy(&ctx, expr);
4735 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
4736 (*nft_set_ext_obj(ext))->use--;
4739 EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
4741 /* Only called from commit path, nft_set_elem_deactivate() already deals with
4742 * the refcounting from the preparation phase.
4744 static void nf_tables_set_elem_destroy(const struct nft_ctx *ctx,
4745 const struct nft_set *set, void *elem)
4747 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
4749 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR))
4750 nf_tables_expr_destroy(ctx, nft_set_ext_expr(ext));
4754 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
4755 const struct nlattr *attr, u32 nlmsg_flags)
4757 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
4758 u8 genmask = nft_genmask_next(ctx->net);
4759 struct nft_data_desc d1, d2;
4760 struct nft_set_ext_tmpl tmpl;
4761 struct nft_set_ext *ext, *ext2;
4762 struct nft_set_elem elem;
4763 struct nft_set_binding *binding;
4764 struct nft_object *obj = NULL;
4765 struct nft_userdata *udata;
4766 struct nft_data data;
4767 enum nft_registers dreg;
4768 struct nft_trans *trans;
4775 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
4776 nft_set_elem_policy, NULL);
4780 if (nla[NFTA_SET_ELEM_KEY] == NULL)
4783 nft_set_ext_prepare(&tmpl);
4785 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
4789 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
4791 if (set->flags & NFT_SET_MAP) {
4792 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
4793 !(flags & NFT_SET_ELEM_INTERVAL_END))
4796 if (nla[NFTA_SET_ELEM_DATA] != NULL)
4800 if ((flags & NFT_SET_ELEM_INTERVAL_END) &&
4801 (nla[NFTA_SET_ELEM_DATA] ||
4802 nla[NFTA_SET_ELEM_OBJREF] ||
4803 nla[NFTA_SET_ELEM_TIMEOUT] ||
4804 nla[NFTA_SET_ELEM_EXPIRATION] ||
4805 nla[NFTA_SET_ELEM_USERDATA] ||
4806 nla[NFTA_SET_ELEM_EXPR]))
4810 if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
4811 if (!(set->flags & NFT_SET_TIMEOUT))
4813 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_TIMEOUT],
4817 } else if (set->flags & NFT_SET_TIMEOUT) {
4818 timeout = set->timeout;
4822 if (nla[NFTA_SET_ELEM_EXPIRATION] != NULL) {
4823 if (!(set->flags & NFT_SET_TIMEOUT))
4825 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_EXPIRATION],
4831 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &d1,
4832 nla[NFTA_SET_ELEM_KEY]);
4836 if (d1.type != NFT_DATA_VALUE || d1.len != set->klen)
4839 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, d1.len);
4841 nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
4842 if (timeout != set->timeout)
4843 nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
4846 if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
4847 if (!(set->flags & NFT_SET_OBJECT)) {
4851 obj = nft_obj_lookup(ctx->net, ctx->table,
4852 nla[NFTA_SET_ELEM_OBJREF],
4853 set->objtype, genmask);
4858 nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
4861 if (nla[NFTA_SET_ELEM_DATA] != NULL) {
4862 err = nft_data_init(ctx, &data, sizeof(data), &d2,
4863 nla[NFTA_SET_ELEM_DATA]);
4868 if (set->dtype != NFT_DATA_VERDICT && d2.len != set->dlen)
4871 dreg = nft_type_to_reg(set->dtype);
4872 list_for_each_entry(binding, &set->bindings, list) {
4873 struct nft_ctx bind_ctx = {
4875 .family = ctx->family,
4876 .table = ctx->table,
4877 .chain = (struct nft_chain *)binding->chain,
4880 if (!(binding->flags & NFT_SET_MAP))
4883 err = nft_validate_register_store(&bind_ctx, dreg,
4889 if (d2.type == NFT_DATA_VERDICT &&
4890 (data.verdict.code == NFT_GOTO ||
4891 data.verdict.code == NFT_JUMP))
4892 nft_validate_state_update(ctx->net,
4896 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, d2.len);
4899 /* The full maximum length of userdata can exceed the maximum
4900 * offset value (U8_MAX) for following extensions, therefor it
4901 * must be the last extension added.
4904 if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
4905 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
4907 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
4912 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, data.data,
4913 timeout, expiration, GFP_KERNEL);
4914 if (elem.priv == NULL)
4917 ext = nft_set_elem_ext(set, elem.priv);
4919 *nft_set_ext_flags(ext) = flags;
4921 udata = nft_set_ext_userdata(ext);
4922 udata->len = ulen - 1;
4923 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
4926 *nft_set_ext_obj(ext) = obj;
4930 trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
4934 ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK;
4935 err = set->ops->insert(ctx->net, set, &elem, &ext2);
4937 if (err == -EEXIST) {
4938 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^
4939 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) ||
4940 nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^
4941 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF)) {
4945 if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
4946 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
4947 memcmp(nft_set_ext_data(ext),
4948 nft_set_ext_data(ext2), set->dlen) != 0) ||
4949 (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
4950 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
4951 *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
4953 else if (!(nlmsg_flags & NLM_F_EXCL))
4960 !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact)) {
4965 nft_trans_elem(trans) = elem;
4966 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
4970 set->ops->remove(ctx->net, set, &elem);
4978 if (nla[NFTA_SET_ELEM_DATA] != NULL)
4979 nft_data_release(&data, d2.type);
4981 nft_data_release(&elem.key.val, d1.type);
4986 static int nf_tables_newsetelem(struct net *net, struct sock *nlsk,
4987 struct sk_buff *skb, const struct nlmsghdr *nlh,
4988 const struct nlattr * const nla[],
4989 struct netlink_ext_ack *extack)
4991 u8 genmask = nft_genmask_next(net);
4992 const struct nlattr *attr;
4993 struct nft_set *set;
4997 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
5000 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack,
5005 set = nft_set_lookup_global(net, ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
5006 nla[NFTA_SET_ELEM_LIST_SET_ID], genmask);
5008 return PTR_ERR(set);
5010 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
5013 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
5014 err = nft_add_set_elem(&ctx, set, attr, nlh->nlmsg_flags);
5019 if (net->nft.validate_state == NFT_VALIDATE_DO)
5020 return nft_table_validate(net, ctx.table);
5026 * nft_data_hold - hold a nft_data item
5028 * @data: struct nft_data to release
5029 * @type: type of data
5031 * Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded,
5032 * NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and
5033 * NFT_GOTO verdicts. This function must be called on active data objects
5034 * from the second phase of the commit protocol.
5036 void nft_data_hold(const struct nft_data *data, enum nft_data_types type)
5038 if (type == NFT_DATA_VERDICT) {
5039 switch (data->verdict.code) {
5042 data->verdict.chain->use++;
5048 static void nft_set_elem_activate(const struct net *net,
5049 const struct nft_set *set,
5050 struct nft_set_elem *elem)
5052 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5054 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
5055 nft_data_hold(nft_set_ext_data(ext), set->dtype);
5056 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
5057 (*nft_set_ext_obj(ext))->use++;
5060 static void nft_set_elem_deactivate(const struct net *net,
5061 const struct nft_set *set,
5062 struct nft_set_elem *elem)
5064 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5066 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
5067 nft_data_release(nft_set_ext_data(ext), set->dtype);
5068 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
5069 (*nft_set_ext_obj(ext))->use--;
5072 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
5073 const struct nlattr *attr)
5075 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
5076 struct nft_set_ext_tmpl tmpl;
5077 struct nft_data_desc desc;
5078 struct nft_set_elem elem;
5079 struct nft_set_ext *ext;
5080 struct nft_trans *trans;
5085 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
5086 nft_set_elem_policy, NULL);
5091 if (nla[NFTA_SET_ELEM_KEY] == NULL)
5094 nft_set_ext_prepare(&tmpl);
5096 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
5100 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
5102 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &desc,
5103 nla[NFTA_SET_ELEM_KEY]);
5108 if (desc.type != NFT_DATA_VALUE || desc.len != set->klen)
5111 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, desc.len);
5114 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, NULL, 0,
5116 if (elem.priv == NULL)
5119 ext = nft_set_elem_ext(set, elem.priv);
5121 *nft_set_ext_flags(ext) = flags;
5123 trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
5124 if (trans == NULL) {
5129 priv = set->ops->deactivate(ctx->net, set, &elem);
5137 nft_set_elem_deactivate(ctx->net, set, &elem);
5139 nft_trans_elem(trans) = elem;
5140 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
5148 nft_data_release(&elem.key.val, desc.type);
5153 static int nft_flush_set(const struct nft_ctx *ctx,
5154 struct nft_set *set,
5155 const struct nft_set_iter *iter,
5156 struct nft_set_elem *elem)
5158 struct nft_trans *trans;
5161 trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
5162 sizeof(struct nft_trans_elem), GFP_ATOMIC);
5166 if (!set->ops->flush(ctx->net, set, elem->priv)) {
5172 nft_set_elem_deactivate(ctx->net, set, elem);
5173 nft_trans_elem_set(trans) = set;
5174 nft_trans_elem(trans) = *elem;
5175 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
5183 static int nf_tables_delsetelem(struct net *net, struct sock *nlsk,
5184 struct sk_buff *skb, const struct nlmsghdr *nlh,
5185 const struct nlattr * const nla[],
5186 struct netlink_ext_ack *extack)
5188 u8 genmask = nft_genmask_next(net);
5189 const struct nlattr *attr;
5190 struct nft_set *set;
5194 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack,
5199 set = nft_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
5201 return PTR_ERR(set);
5202 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
5205 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL) {
5206 struct nft_set_iter iter = {
5208 .fn = nft_flush_set,
5210 set->ops->walk(&ctx, set, &iter);
5215 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
5216 err = nft_del_setelem(&ctx, set, attr);
5225 void nft_set_gc_batch_release(struct rcu_head *rcu)
5227 struct nft_set_gc_batch *gcb;
5230 gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu);
5231 for (i = 0; i < gcb->head.cnt; i++)
5232 nft_set_elem_destroy(gcb->head.set, gcb->elems[i], true);
5235 EXPORT_SYMBOL_GPL(nft_set_gc_batch_release);
5237 struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
5240 struct nft_set_gc_batch *gcb;
5242 gcb = kzalloc(sizeof(*gcb), gfp);
5245 gcb->head.set = set;
5248 EXPORT_SYMBOL_GPL(nft_set_gc_batch_alloc);
5255 * nft_register_obj- register nf_tables stateful object type
5258 * Registers the object type for use with nf_tables. Returns zero on
5259 * success or a negative errno code otherwise.
5261 int nft_register_obj(struct nft_object_type *obj_type)
5263 if (obj_type->type == NFT_OBJECT_UNSPEC)
5266 nfnl_lock(NFNL_SUBSYS_NFTABLES);
5267 list_add_rcu(&obj_type->list, &nf_tables_objects);
5268 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
5271 EXPORT_SYMBOL_GPL(nft_register_obj);
5274 * nft_unregister_obj - unregister nf_tables object type
5277 * Unregisters the object type for use with nf_tables.
5279 void nft_unregister_obj(struct nft_object_type *obj_type)
5281 nfnl_lock(NFNL_SUBSYS_NFTABLES);
5282 list_del_rcu(&obj_type->list);
5283 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
5285 EXPORT_SYMBOL_GPL(nft_unregister_obj);
5287 struct nft_object *nft_obj_lookup(const struct net *net,
5288 const struct nft_table *table,
5289 const struct nlattr *nla, u32 objtype,
5292 struct nft_object_hash_key k = { .table = table };
5293 char search[NFT_OBJ_MAXNAMELEN];
5294 struct rhlist_head *tmp, *list;
5295 struct nft_object *obj;
5297 nla_strlcpy(search, nla, sizeof(search));
5300 WARN_ON_ONCE(!rcu_read_lock_held() &&
5301 !lockdep_commit_lock_is_held(net));
5304 list = rhltable_lookup(&nft_objname_ht, &k, nft_objname_ht_params);
5308 rhl_for_each_entry_rcu(obj, tmp, list, rhlhead) {
5309 if (objtype == obj->ops->type->type &&
5310 nft_active_genmask(obj, genmask)) {
5317 return ERR_PTR(-ENOENT);
5319 EXPORT_SYMBOL_GPL(nft_obj_lookup);
5321 static struct nft_object *nft_obj_lookup_byhandle(const struct nft_table *table,
5322 const struct nlattr *nla,
5323 u32 objtype, u8 genmask)
5325 struct nft_object *obj;
5327 list_for_each_entry(obj, &table->objects, list) {
5328 if (be64_to_cpu(nla_get_be64(nla)) == obj->handle &&
5329 objtype == obj->ops->type->type &&
5330 nft_active_genmask(obj, genmask))
5333 return ERR_PTR(-ENOENT);
5336 static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
5337 [NFTA_OBJ_TABLE] = { .type = NLA_STRING,
5338 .len = NFT_TABLE_MAXNAMELEN - 1 },
5339 [NFTA_OBJ_NAME] = { .type = NLA_STRING,
5340 .len = NFT_OBJ_MAXNAMELEN - 1 },
5341 [NFTA_OBJ_TYPE] = { .type = NLA_U32 },
5342 [NFTA_OBJ_DATA] = { .type = NLA_NESTED },
5343 [NFTA_OBJ_HANDLE] = { .type = NLA_U64},
5346 static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,
5347 const struct nft_object_type *type,
5348 const struct nlattr *attr)
5351 const struct nft_object_ops *ops;
5352 struct nft_object *obj;
5355 tb = kmalloc_array(type->maxattr + 1, sizeof(*tb), GFP_KERNEL);
5360 err = nla_parse_nested_deprecated(tb, type->maxattr, attr,
5361 type->policy, NULL);
5365 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
5368 if (type->select_ops) {
5369 ops = type->select_ops(ctx, (const struct nlattr * const *)tb);
5379 obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL);
5383 err = ops->init(ctx, (const struct nlattr * const *)tb, obj);
5396 return ERR_PTR(err);
5399 static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
5400 struct nft_object *obj, bool reset)
5402 struct nlattr *nest;
5404 nest = nla_nest_start_noflag(skb, attr);
5406 goto nla_put_failure;
5407 if (obj->ops->dump(skb, obj, reset) < 0)
5408 goto nla_put_failure;
5409 nla_nest_end(skb, nest);
5416 static const struct nft_object_type *__nft_obj_type_get(u32 objtype)
5418 const struct nft_object_type *type;
5420 list_for_each_entry(type, &nf_tables_objects, list) {
5421 if (objtype == type->type)
5427 static const struct nft_object_type *
5428 nft_obj_type_get(struct net *net, u32 objtype)
5430 const struct nft_object_type *type;
5432 type = __nft_obj_type_get(objtype);
5433 if (type != NULL && try_module_get(type->owner))
5436 lockdep_nfnl_nft_mutex_not_held();
5437 #ifdef CONFIG_MODULES
5439 if (nft_request_module(net, "nft-obj-%u", objtype) == -EAGAIN)
5440 return ERR_PTR(-EAGAIN);
5443 return ERR_PTR(-ENOENT);
5446 static int nf_tables_updobj(const struct nft_ctx *ctx,
5447 const struct nft_object_type *type,
5448 const struct nlattr *attr,
5449 struct nft_object *obj)
5451 struct nft_object *newobj;
5452 struct nft_trans *trans;
5455 trans = nft_trans_alloc(ctx, NFT_MSG_NEWOBJ,
5456 sizeof(struct nft_trans_obj));
5460 newobj = nft_obj_init(ctx, type, attr);
5461 if (IS_ERR(newobj)) {
5462 err = PTR_ERR(newobj);
5463 goto err_free_trans;
5466 nft_trans_obj(trans) = obj;
5467 nft_trans_obj_update(trans) = true;
5468 nft_trans_obj_newobj(trans) = newobj;
5469 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
5478 static int nf_tables_newobj(struct net *net, struct sock *nlsk,
5479 struct sk_buff *skb, const struct nlmsghdr *nlh,
5480 const struct nlattr * const nla[],
5481 struct netlink_ext_ack *extack)
5483 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
5484 const struct nft_object_type *type;
5485 u8 genmask = nft_genmask_next(net);
5486 int family = nfmsg->nfgen_family;
5487 struct nft_table *table;
5488 struct nft_object *obj;
5493 if (!nla[NFTA_OBJ_TYPE] ||
5494 !nla[NFTA_OBJ_NAME] ||
5495 !nla[NFTA_OBJ_DATA])
5498 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask);
5499 if (IS_ERR(table)) {
5500 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
5501 return PTR_ERR(table);
5504 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
5505 obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
5508 if (err != -ENOENT) {
5509 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
5513 if (nlh->nlmsg_flags & NLM_F_EXCL) {
5514 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
5517 if (nlh->nlmsg_flags & NLM_F_REPLACE)
5520 type = __nft_obj_type_get(objtype);
5521 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
5523 return nf_tables_updobj(&ctx, type, nla[NFTA_OBJ_DATA], obj);
5526 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
5528 type = nft_obj_type_get(net, objtype);
5530 return PTR_ERR(type);
5532 obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]);
5537 obj->key.table = table;
5538 obj->handle = nf_tables_alloc_handle(table);
5540 obj->key.name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL);
5541 if (!obj->key.name) {
5546 err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
5550 err = rhltable_insert(&nft_objname_ht, &obj->rhlhead,
5551 nft_objname_ht_params);
5555 list_add_tail_rcu(&obj->list, &table->objects);
5559 /* queued in transaction log */
5560 INIT_LIST_HEAD(&obj->list);
5563 kfree(obj->key.name);
5565 if (obj->ops->destroy)
5566 obj->ops->destroy(&ctx, obj);
5569 module_put(type->owner);
5573 static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
5574 u32 portid, u32 seq, int event, u32 flags,
5575 int family, const struct nft_table *table,
5576 struct nft_object *obj, bool reset)
5578 struct nfgenmsg *nfmsg;
5579 struct nlmsghdr *nlh;
5581 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
5582 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
5584 goto nla_put_failure;
5586 nfmsg = nlmsg_data(nlh);
5587 nfmsg->nfgen_family = family;
5588 nfmsg->version = NFNETLINK_V0;
5589 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
5591 if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
5592 nla_put_string(skb, NFTA_OBJ_NAME, obj->key.name) ||
5593 nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) ||
5594 nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
5595 nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset) ||
5596 nla_put_be64(skb, NFTA_OBJ_HANDLE, cpu_to_be64(obj->handle),
5598 goto nla_put_failure;
5600 nlmsg_end(skb, nlh);
5604 nlmsg_trim(skb, nlh);
5608 struct nft_obj_filter {
5613 static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
5615 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
5616 const struct nft_table *table;
5617 unsigned int idx = 0, s_idx = cb->args[0];
5618 struct nft_obj_filter *filter = cb->data;
5619 struct net *net = sock_net(skb->sk);
5620 int family = nfmsg->nfgen_family;
5621 struct nft_object *obj;
5624 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
5628 cb->seq = net->nft.base_seq;
5630 list_for_each_entry_rcu(table, &net->nft.tables, list) {
5631 if (family != NFPROTO_UNSPEC && family != table->family)
5634 list_for_each_entry_rcu(obj, &table->objects, list) {
5635 if (!nft_is_active(net, obj))
5640 memset(&cb->args[1], 0,
5641 sizeof(cb->args) - sizeof(cb->args[0]));
5642 if (filter && filter->table &&
5643 strcmp(filter->table, table->name))
5646 filter->type != NFT_OBJECT_UNSPEC &&
5647 obj->ops->type->type != filter->type)
5650 if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid,
5653 NLM_F_MULTI | NLM_F_APPEND,
5654 table->family, table,
5658 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
5670 static int nf_tables_dump_obj_start(struct netlink_callback *cb)
5672 const struct nlattr * const *nla = cb->data;
5673 struct nft_obj_filter *filter = NULL;
5675 if (nla[NFTA_OBJ_TABLE] || nla[NFTA_OBJ_TYPE]) {
5676 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
5680 if (nla[NFTA_OBJ_TABLE]) {
5681 filter->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_ATOMIC);
5682 if (!filter->table) {
5688 if (nla[NFTA_OBJ_TYPE])
5689 filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
5696 static int nf_tables_dump_obj_done(struct netlink_callback *cb)
5698 struct nft_obj_filter *filter = cb->data;
5701 kfree(filter->table);
5708 /* called with rcu_read_lock held */
5709 static int nf_tables_getobj(struct net *net, struct sock *nlsk,
5710 struct sk_buff *skb, const struct nlmsghdr *nlh,
5711 const struct nlattr * const nla[],
5712 struct netlink_ext_ack *extack)
5714 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
5715 u8 genmask = nft_genmask_cur(net);
5716 int family = nfmsg->nfgen_family;
5717 const struct nft_table *table;
5718 struct nft_object *obj;
5719 struct sk_buff *skb2;
5724 if (nlh->nlmsg_flags & NLM_F_DUMP) {
5725 struct netlink_dump_control c = {
5726 .start = nf_tables_dump_obj_start,
5727 .dump = nf_tables_dump_obj,
5728 .done = nf_tables_dump_obj_done,
5729 .module = THIS_MODULE,
5730 .data = (void *)nla,
5733 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
5736 if (!nla[NFTA_OBJ_NAME] ||
5737 !nla[NFTA_OBJ_TYPE])
5740 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask);
5741 if (IS_ERR(table)) {
5742 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
5743 return PTR_ERR(table);
5746 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
5747 obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
5749 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
5750 return PTR_ERR(obj);
5753 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
5757 if (NFNL_MSG_TYPE(nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
5760 err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
5761 nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
5762 family, table, obj, reset);
5766 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
5772 static void nft_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj)
5774 if (obj->ops->destroy)
5775 obj->ops->destroy(ctx, obj);
5777 module_put(obj->ops->type->owner);
5778 kfree(obj->key.name);
5782 static int nf_tables_delobj(struct net *net, struct sock *nlsk,
5783 struct sk_buff *skb, const struct nlmsghdr *nlh,
5784 const struct nlattr * const nla[],
5785 struct netlink_ext_ack *extack)
5787 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
5788 u8 genmask = nft_genmask_next(net);
5789 int family = nfmsg->nfgen_family;
5790 const struct nlattr *attr;
5791 struct nft_table *table;
5792 struct nft_object *obj;
5796 if (!nla[NFTA_OBJ_TYPE] ||
5797 (!nla[NFTA_OBJ_NAME] && !nla[NFTA_OBJ_HANDLE]))
5800 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask);
5801 if (IS_ERR(table)) {
5802 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
5803 return PTR_ERR(table);
5806 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
5807 if (nla[NFTA_OBJ_HANDLE]) {
5808 attr = nla[NFTA_OBJ_HANDLE];
5809 obj = nft_obj_lookup_byhandle(table, attr, objtype, genmask);
5811 attr = nla[NFTA_OBJ_NAME];
5812 obj = nft_obj_lookup(net, table, attr, objtype, genmask);
5816 NL_SET_BAD_ATTR(extack, attr);
5817 return PTR_ERR(obj);
5820 NL_SET_BAD_ATTR(extack, attr);
5824 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
5826 return nft_delobj(&ctx, obj);
5829 void nft_obj_notify(struct net *net, const struct nft_table *table,
5830 struct nft_object *obj, u32 portid, u32 seq, int event,
5831 int family, int report, gfp_t gfp)
5833 struct sk_buff *skb;
5837 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
5840 skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
5844 err = nf_tables_fill_obj_info(skb, net, portid, seq, event, 0, family,
5851 nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, report, gfp);
5854 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
5856 EXPORT_SYMBOL_GPL(nft_obj_notify);
5858 static void nf_tables_obj_notify(const struct nft_ctx *ctx,
5859 struct nft_object *obj, int event)
5861 nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid, ctx->seq, event,
5862 ctx->family, ctx->report, GFP_KERNEL);
5868 void nft_register_flowtable_type(struct nf_flowtable_type *type)
5870 nfnl_lock(NFNL_SUBSYS_NFTABLES);
5871 list_add_tail_rcu(&type->list, &nf_tables_flowtables);
5872 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
5874 EXPORT_SYMBOL_GPL(nft_register_flowtable_type);
5876 void nft_unregister_flowtable_type(struct nf_flowtable_type *type)
5878 nfnl_lock(NFNL_SUBSYS_NFTABLES);
5879 list_del_rcu(&type->list);
5880 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
5882 EXPORT_SYMBOL_GPL(nft_unregister_flowtable_type);
5884 static const struct nla_policy nft_flowtable_policy[NFTA_FLOWTABLE_MAX + 1] = {
5885 [NFTA_FLOWTABLE_TABLE] = { .type = NLA_STRING,
5886 .len = NFT_NAME_MAXLEN - 1 },
5887 [NFTA_FLOWTABLE_NAME] = { .type = NLA_STRING,
5888 .len = NFT_NAME_MAXLEN - 1 },
5889 [NFTA_FLOWTABLE_HOOK] = { .type = NLA_NESTED },
5890 [NFTA_FLOWTABLE_HANDLE] = { .type = NLA_U64 },
5891 [NFTA_FLOWTABLE_FLAGS] = { .type = NLA_U32 },
5894 struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table,
5895 const struct nlattr *nla, u8 genmask)
5897 struct nft_flowtable *flowtable;
5899 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
5900 if (!nla_strcmp(nla, flowtable->name) &&
5901 nft_active_genmask(flowtable, genmask))
5904 return ERR_PTR(-ENOENT);
5906 EXPORT_SYMBOL_GPL(nft_flowtable_lookup);
5908 void nf_tables_deactivate_flowtable(const struct nft_ctx *ctx,
5909 struct nft_flowtable *flowtable,
5910 enum nft_trans_phase phase)
5913 case NFT_TRANS_PREPARE:
5914 case NFT_TRANS_ABORT:
5915 case NFT_TRANS_RELEASE:
5922 EXPORT_SYMBOL_GPL(nf_tables_deactivate_flowtable);
5924 static struct nft_flowtable *
5925 nft_flowtable_lookup_byhandle(const struct nft_table *table,
5926 const struct nlattr *nla, u8 genmask)
5928 struct nft_flowtable *flowtable;
5930 list_for_each_entry(flowtable, &table->flowtables, list) {
5931 if (be64_to_cpu(nla_get_be64(nla)) == flowtable->handle &&
5932 nft_active_genmask(flowtable, genmask))
5935 return ERR_PTR(-ENOENT);
5938 static const struct nla_policy nft_flowtable_hook_policy[NFTA_FLOWTABLE_HOOK_MAX + 1] = {
5939 [NFTA_FLOWTABLE_HOOK_NUM] = { .type = NLA_U32 },
5940 [NFTA_FLOWTABLE_HOOK_PRIORITY] = { .type = NLA_U32 },
5941 [NFTA_FLOWTABLE_HOOK_DEVS] = { .type = NLA_NESTED },
5944 static int nf_tables_flowtable_parse_hook(const struct nft_ctx *ctx,
5945 const struct nlattr *attr,
5946 struct nft_flowtable *flowtable)
5948 struct nlattr *tb[NFTA_FLOWTABLE_HOOK_MAX + 1];
5949 struct nft_hook *hook;
5950 int hooknum, priority;
5953 err = nla_parse_nested_deprecated(tb, NFTA_FLOWTABLE_HOOK_MAX, attr,
5954 nft_flowtable_hook_policy, NULL);
5958 if (!tb[NFTA_FLOWTABLE_HOOK_NUM] ||
5959 !tb[NFTA_FLOWTABLE_HOOK_PRIORITY] ||
5960 !tb[NFTA_FLOWTABLE_HOOK_DEVS])
5963 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
5964 if (hooknum != NF_NETDEV_INGRESS)
5967 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
5969 err = nf_tables_parse_netdev_hooks(ctx->net,
5970 tb[NFTA_FLOWTABLE_HOOK_DEVS],
5971 &flowtable->hook_list);
5975 flowtable->hooknum = hooknum;
5976 flowtable->data.priority = priority;
5978 list_for_each_entry(hook, &flowtable->hook_list, list) {
5979 hook->ops.pf = NFPROTO_NETDEV;
5980 hook->ops.hooknum = hooknum;
5981 hook->ops.priority = priority;
5982 hook->ops.priv = &flowtable->data;
5983 hook->ops.hook = flowtable->data.type->hook;
5989 static const struct nf_flowtable_type *__nft_flowtable_type_get(u8 family)
5991 const struct nf_flowtable_type *type;
5993 list_for_each_entry(type, &nf_tables_flowtables, list) {
5994 if (family == type->family)
6000 static const struct nf_flowtable_type *
6001 nft_flowtable_type_get(struct net *net, u8 family)
6003 const struct nf_flowtable_type *type;
6005 type = __nft_flowtable_type_get(family);
6006 if (type != NULL && try_module_get(type->owner))
6009 lockdep_nfnl_nft_mutex_not_held();
6010 #ifdef CONFIG_MODULES
6012 if (nft_request_module(net, "nf-flowtable-%u", family) == -EAGAIN)
6013 return ERR_PTR(-EAGAIN);
6016 return ERR_PTR(-ENOENT);
6019 /* Only called from error and netdev event paths. */
6020 static void nft_unregister_flowtable_hook(struct net *net,
6021 struct nft_flowtable *flowtable,
6022 struct nft_hook *hook)
6024 nf_unregister_net_hook(net, &hook->ops);
6025 flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
6029 static void nft_unregister_flowtable_net_hooks(struct net *net,
6030 struct nft_flowtable *flowtable)
6032 struct nft_hook *hook;
6034 list_for_each_entry(hook, &flowtable->hook_list, list)
6035 nf_unregister_net_hook(net, &hook->ops);
6038 static int nft_register_flowtable_net_hooks(struct net *net,
6039 struct nft_table *table,
6040 struct nft_flowtable *flowtable)
6042 struct nft_hook *hook, *hook2, *next;
6043 struct nft_flowtable *ft;
6046 list_for_each_entry(hook, &flowtable->hook_list, list) {
6047 list_for_each_entry(ft, &table->flowtables, list) {
6048 list_for_each_entry(hook2, &ft->hook_list, list) {
6049 if (hook->ops.dev == hook2->ops.dev &&
6050 hook->ops.pf == hook2->ops.pf) {
6052 goto err_unregister_net_hooks;
6057 err = flowtable->data.type->setup(&flowtable->data,
6061 goto err_unregister_net_hooks;
6063 err = nf_register_net_hook(net, &hook->ops);
6065 flowtable->data.type->setup(&flowtable->data,
6068 goto err_unregister_net_hooks;
6076 err_unregister_net_hooks:
6077 list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
6081 nft_unregister_flowtable_hook(net, flowtable, hook);
6082 list_del_rcu(&hook->list);
6083 kfree_rcu(hook, rcu);
6089 static int nf_tables_newflowtable(struct net *net, struct sock *nlsk,
6090 struct sk_buff *skb,
6091 const struct nlmsghdr *nlh,
6092 const struct nlattr * const nla[],
6093 struct netlink_ext_ack *extack)
6095 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
6096 const struct nf_flowtable_type *type;
6097 u8 genmask = nft_genmask_next(net);
6098 int family = nfmsg->nfgen_family;
6099 struct nft_flowtable *flowtable;
6100 struct nft_hook *hook, *next;
6101 struct nft_table *table;
6105 if (!nla[NFTA_FLOWTABLE_TABLE] ||
6106 !nla[NFTA_FLOWTABLE_NAME] ||
6107 !nla[NFTA_FLOWTABLE_HOOK])
6110 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
6112 if (IS_ERR(table)) {
6113 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
6114 return PTR_ERR(table);
6117 flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
6119 if (IS_ERR(flowtable)) {
6120 err = PTR_ERR(flowtable);
6121 if (err != -ENOENT) {
6122 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
6126 if (nlh->nlmsg_flags & NLM_F_EXCL) {
6127 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
6134 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
6136 flowtable = kzalloc(sizeof(*flowtable), GFP_KERNEL);
6140 flowtable->table = table;
6141 flowtable->handle = nf_tables_alloc_handle(table);
6142 INIT_LIST_HEAD(&flowtable->hook_list);
6144 flowtable->name = nla_strdup(nla[NFTA_FLOWTABLE_NAME], GFP_KERNEL);
6145 if (!flowtable->name) {
6150 type = nft_flowtable_type_get(net, family);
6152 err = PTR_ERR(type);
6156 if (nla[NFTA_FLOWTABLE_FLAGS]) {
6157 flowtable->data.flags =
6158 ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
6159 if (flowtable->data.flags & ~NF_FLOWTABLE_HW_OFFLOAD)
6163 write_pnet(&flowtable->data.net, net);
6164 flowtable->data.type = type;
6165 err = type->init(&flowtable->data);
6169 err = nf_tables_flowtable_parse_hook(&ctx, nla[NFTA_FLOWTABLE_HOOK],
6174 err = nft_register_flowtable_net_hooks(ctx.net, table, flowtable);
6178 err = nft_trans_flowtable_add(&ctx, NFT_MSG_NEWFLOWTABLE, flowtable);
6182 list_add_tail_rcu(&flowtable->list, &table->flowtables);
6187 list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
6188 nft_unregister_flowtable_hook(net, flowtable, hook);
6189 list_del_rcu(&hook->list);
6190 kfree_rcu(hook, rcu);
6193 flowtable->data.type->free(&flowtable->data);
6195 module_put(type->owner);
6197 kfree(flowtable->name);
6203 static int nf_tables_delflowtable(struct net *net, struct sock *nlsk,
6204 struct sk_buff *skb,
6205 const struct nlmsghdr *nlh,
6206 const struct nlattr * const nla[],
6207 struct netlink_ext_ack *extack)
6209 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
6210 u8 genmask = nft_genmask_next(net);
6211 int family = nfmsg->nfgen_family;
6212 struct nft_flowtable *flowtable;
6213 const struct nlattr *attr;
6214 struct nft_table *table;
6217 if (!nla[NFTA_FLOWTABLE_TABLE] ||
6218 (!nla[NFTA_FLOWTABLE_NAME] &&
6219 !nla[NFTA_FLOWTABLE_HANDLE]))
6222 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
6224 if (IS_ERR(table)) {
6225 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
6226 return PTR_ERR(table);
6229 if (nla[NFTA_FLOWTABLE_HANDLE]) {
6230 attr = nla[NFTA_FLOWTABLE_HANDLE];
6231 flowtable = nft_flowtable_lookup_byhandle(table, attr, genmask);
6233 attr = nla[NFTA_FLOWTABLE_NAME];
6234 flowtable = nft_flowtable_lookup(table, attr, genmask);
6237 if (IS_ERR(flowtable)) {
6238 NL_SET_BAD_ATTR(extack, attr);
6239 return PTR_ERR(flowtable);
6241 if (flowtable->use > 0) {
6242 NL_SET_BAD_ATTR(extack, attr);
6246 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
6248 return nft_delflowtable(&ctx, flowtable);
6251 static int nf_tables_fill_flowtable_info(struct sk_buff *skb, struct net *net,
6252 u32 portid, u32 seq, int event,
6253 u32 flags, int family,
6254 struct nft_flowtable *flowtable)
6256 struct nlattr *nest, *nest_devs;
6257 struct nfgenmsg *nfmsg;
6258 struct nft_hook *hook;
6259 struct nlmsghdr *nlh;
6261 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
6262 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
6264 goto nla_put_failure;
6266 nfmsg = nlmsg_data(nlh);
6267 nfmsg->nfgen_family = family;
6268 nfmsg->version = NFNETLINK_V0;
6269 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
6271 if (nla_put_string(skb, NFTA_FLOWTABLE_TABLE, flowtable->table->name) ||
6272 nla_put_string(skb, NFTA_FLOWTABLE_NAME, flowtable->name) ||
6273 nla_put_be32(skb, NFTA_FLOWTABLE_USE, htonl(flowtable->use)) ||
6274 nla_put_be64(skb, NFTA_FLOWTABLE_HANDLE, cpu_to_be64(flowtable->handle),
6275 NFTA_FLOWTABLE_PAD) ||
6276 nla_put_be32(skb, NFTA_FLOWTABLE_FLAGS, htonl(flowtable->data.flags)))
6277 goto nla_put_failure;
6279 nest = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK);
6281 goto nla_put_failure;
6282 if (nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_NUM, htonl(flowtable->hooknum)) ||
6283 nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_PRIORITY, htonl(flowtable->data.priority)))
6284 goto nla_put_failure;
6286 nest_devs = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK_DEVS);
6288 goto nla_put_failure;
6290 list_for_each_entry_rcu(hook, &flowtable->hook_list, list) {
6291 if (nla_put_string(skb, NFTA_DEVICE_NAME, hook->ops.dev->name))
6292 goto nla_put_failure;
6294 nla_nest_end(skb, nest_devs);
6295 nla_nest_end(skb, nest);
6297 nlmsg_end(skb, nlh);
6301 nlmsg_trim(skb, nlh);
6305 struct nft_flowtable_filter {
6309 static int nf_tables_dump_flowtable(struct sk_buff *skb,
6310 struct netlink_callback *cb)
6312 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
6313 struct nft_flowtable_filter *filter = cb->data;
6314 unsigned int idx = 0, s_idx = cb->args[0];
6315 struct net *net = sock_net(skb->sk);
6316 int family = nfmsg->nfgen_family;
6317 struct nft_flowtable *flowtable;
6318 const struct nft_table *table;
6321 cb->seq = net->nft.base_seq;
6323 list_for_each_entry_rcu(table, &net->nft.tables, list) {
6324 if (family != NFPROTO_UNSPEC && family != table->family)
6327 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
6328 if (!nft_is_active(net, flowtable))
6333 memset(&cb->args[1], 0,
6334 sizeof(cb->args) - sizeof(cb->args[0]));
6335 if (filter && filter->table &&
6336 strcmp(filter->table, table->name))
6339 if (nf_tables_fill_flowtable_info(skb, net, NETLINK_CB(cb->skb).portid,
6341 NFT_MSG_NEWFLOWTABLE,
6342 NLM_F_MULTI | NLM_F_APPEND,
6343 table->family, flowtable) < 0)
6346 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
6358 static int nf_tables_dump_flowtable_start(struct netlink_callback *cb)
6360 const struct nlattr * const *nla = cb->data;
6361 struct nft_flowtable_filter *filter = NULL;
6363 if (nla[NFTA_FLOWTABLE_TABLE]) {
6364 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
6368 filter->table = nla_strdup(nla[NFTA_FLOWTABLE_TABLE],
6370 if (!filter->table) {
6380 static int nf_tables_dump_flowtable_done(struct netlink_callback *cb)
6382 struct nft_flowtable_filter *filter = cb->data;
6387 kfree(filter->table);
6393 /* called with rcu_read_lock held */
6394 static int nf_tables_getflowtable(struct net *net, struct sock *nlsk,
6395 struct sk_buff *skb,
6396 const struct nlmsghdr *nlh,
6397 const struct nlattr * const nla[],
6398 struct netlink_ext_ack *extack)
6400 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
6401 u8 genmask = nft_genmask_cur(net);
6402 int family = nfmsg->nfgen_family;
6403 struct nft_flowtable *flowtable;
6404 const struct nft_table *table;
6405 struct sk_buff *skb2;
6408 if (nlh->nlmsg_flags & NLM_F_DUMP) {
6409 struct netlink_dump_control c = {
6410 .start = nf_tables_dump_flowtable_start,
6411 .dump = nf_tables_dump_flowtable,
6412 .done = nf_tables_dump_flowtable_done,
6413 .module = THIS_MODULE,
6414 .data = (void *)nla,
6417 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
6420 if (!nla[NFTA_FLOWTABLE_NAME])
6423 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
6426 return PTR_ERR(table);
6428 flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
6430 if (IS_ERR(flowtable))
6431 return PTR_ERR(flowtable);
6433 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
6437 err = nf_tables_fill_flowtable_info(skb2, net, NETLINK_CB(skb).portid,
6439 NFT_MSG_NEWFLOWTABLE, 0, family,
6444 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
6450 static void nf_tables_flowtable_notify(struct nft_ctx *ctx,
6451 struct nft_flowtable *flowtable,
6454 struct sk_buff *skb;
6458 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
6461 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
6465 err = nf_tables_fill_flowtable_info(skb, ctx->net, ctx->portid,
6467 ctx->family, flowtable);
6473 nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
6474 ctx->report, GFP_KERNEL);
6477 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
6480 static void nf_tables_flowtable_destroy(struct nft_flowtable *flowtable)
6482 struct nft_hook *hook, *next;
6484 flowtable->data.type->free(&flowtable->data);
6485 list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
6486 flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
6488 list_del_rcu(&hook->list);
6491 kfree(flowtable->name);
6492 module_put(flowtable->data.type->owner);
6496 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
6497 u32 portid, u32 seq)
6499 struct nlmsghdr *nlh;
6500 struct nfgenmsg *nfmsg;
6501 char buf[TASK_COMM_LEN];
6502 int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN);
6504 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), 0);
6506 goto nla_put_failure;
6508 nfmsg = nlmsg_data(nlh);
6509 nfmsg->nfgen_family = AF_UNSPEC;
6510 nfmsg->version = NFNETLINK_V0;
6511 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
6513 if (nla_put_be32(skb, NFTA_GEN_ID, htonl(net->nft.base_seq)) ||
6514 nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) ||
6515 nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current)))
6516 goto nla_put_failure;
6518 nlmsg_end(skb, nlh);
6522 nlmsg_trim(skb, nlh);
6526 static void nft_flowtable_event(unsigned long event, struct net_device *dev,
6527 struct nft_flowtable *flowtable)
6529 struct nft_hook *hook;
6531 list_for_each_entry(hook, &flowtable->hook_list, list) {
6532 if (hook->ops.dev != dev)
6535 /* flow_offload_netdev_event() cleans up entries for us. */
6536 nft_unregister_flowtable_hook(dev_net(dev), flowtable, hook);
6537 list_del_rcu(&hook->list);
6538 kfree_rcu(hook, rcu);
6543 static int nf_tables_flowtable_event(struct notifier_block *this,
6544 unsigned long event, void *ptr)
6546 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
6547 struct nft_flowtable *flowtable;
6548 struct nft_table *table;
6551 if (event != NETDEV_UNREGISTER)
6555 mutex_lock(&net->nft.commit_mutex);
6556 list_for_each_entry(table, &net->nft.tables, list) {
6557 list_for_each_entry(flowtable, &table->flowtables, list) {
6558 nft_flowtable_event(event, dev, flowtable);
6561 mutex_unlock(&net->nft.commit_mutex);
6566 static struct notifier_block nf_tables_flowtable_notifier = {
6567 .notifier_call = nf_tables_flowtable_event,
6570 static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
6573 struct nlmsghdr *nlh = nlmsg_hdr(skb);
6574 struct sk_buff *skb2;
6577 if (nlmsg_report(nlh) &&
6578 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
6581 skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
6585 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
6592 nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
6593 nlmsg_report(nlh), GFP_KERNEL);
6596 nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
6600 static int nf_tables_getgen(struct net *net, struct sock *nlsk,
6601 struct sk_buff *skb, const struct nlmsghdr *nlh,
6602 const struct nlattr * const nla[],
6603 struct netlink_ext_ack *extack)
6605 struct sk_buff *skb2;
6608 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
6612 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
6617 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
6623 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
6624 [NFT_MSG_NEWTABLE] = {
6625 .call_batch = nf_tables_newtable,
6626 .attr_count = NFTA_TABLE_MAX,
6627 .policy = nft_table_policy,
6629 [NFT_MSG_GETTABLE] = {
6630 .call_rcu = nf_tables_gettable,
6631 .attr_count = NFTA_TABLE_MAX,
6632 .policy = nft_table_policy,
6634 [NFT_MSG_DELTABLE] = {
6635 .call_batch = nf_tables_deltable,
6636 .attr_count = NFTA_TABLE_MAX,
6637 .policy = nft_table_policy,
6639 [NFT_MSG_NEWCHAIN] = {
6640 .call_batch = nf_tables_newchain,
6641 .attr_count = NFTA_CHAIN_MAX,
6642 .policy = nft_chain_policy,
6644 [NFT_MSG_GETCHAIN] = {
6645 .call_rcu = nf_tables_getchain,
6646 .attr_count = NFTA_CHAIN_MAX,
6647 .policy = nft_chain_policy,
6649 [NFT_MSG_DELCHAIN] = {
6650 .call_batch = nf_tables_delchain,
6651 .attr_count = NFTA_CHAIN_MAX,
6652 .policy = nft_chain_policy,
6654 [NFT_MSG_NEWRULE] = {
6655 .call_batch = nf_tables_newrule,
6656 .attr_count = NFTA_RULE_MAX,
6657 .policy = nft_rule_policy,
6659 [NFT_MSG_GETRULE] = {
6660 .call_rcu = nf_tables_getrule,
6661 .attr_count = NFTA_RULE_MAX,
6662 .policy = nft_rule_policy,
6664 [NFT_MSG_DELRULE] = {
6665 .call_batch = nf_tables_delrule,
6666 .attr_count = NFTA_RULE_MAX,
6667 .policy = nft_rule_policy,
6669 [NFT_MSG_NEWSET] = {
6670 .call_batch = nf_tables_newset,
6671 .attr_count = NFTA_SET_MAX,
6672 .policy = nft_set_policy,
6674 [NFT_MSG_GETSET] = {
6675 .call_rcu = nf_tables_getset,
6676 .attr_count = NFTA_SET_MAX,
6677 .policy = nft_set_policy,
6679 [NFT_MSG_DELSET] = {
6680 .call_batch = nf_tables_delset,
6681 .attr_count = NFTA_SET_MAX,
6682 .policy = nft_set_policy,
6684 [NFT_MSG_NEWSETELEM] = {
6685 .call_batch = nf_tables_newsetelem,
6686 .attr_count = NFTA_SET_ELEM_LIST_MAX,
6687 .policy = nft_set_elem_list_policy,
6689 [NFT_MSG_GETSETELEM] = {
6690 .call_rcu = nf_tables_getsetelem,
6691 .attr_count = NFTA_SET_ELEM_LIST_MAX,
6692 .policy = nft_set_elem_list_policy,
6694 [NFT_MSG_DELSETELEM] = {
6695 .call_batch = nf_tables_delsetelem,
6696 .attr_count = NFTA_SET_ELEM_LIST_MAX,
6697 .policy = nft_set_elem_list_policy,
6699 [NFT_MSG_GETGEN] = {
6700 .call_rcu = nf_tables_getgen,
6702 [NFT_MSG_NEWOBJ] = {
6703 .call_batch = nf_tables_newobj,
6704 .attr_count = NFTA_OBJ_MAX,
6705 .policy = nft_obj_policy,
6707 [NFT_MSG_GETOBJ] = {
6708 .call_rcu = nf_tables_getobj,
6709 .attr_count = NFTA_OBJ_MAX,
6710 .policy = nft_obj_policy,
6712 [NFT_MSG_DELOBJ] = {
6713 .call_batch = nf_tables_delobj,
6714 .attr_count = NFTA_OBJ_MAX,
6715 .policy = nft_obj_policy,
6717 [NFT_MSG_GETOBJ_RESET] = {
6718 .call_rcu = nf_tables_getobj,
6719 .attr_count = NFTA_OBJ_MAX,
6720 .policy = nft_obj_policy,
6722 [NFT_MSG_NEWFLOWTABLE] = {
6723 .call_batch = nf_tables_newflowtable,
6724 .attr_count = NFTA_FLOWTABLE_MAX,
6725 .policy = nft_flowtable_policy,
6727 [NFT_MSG_GETFLOWTABLE] = {
6728 .call_rcu = nf_tables_getflowtable,
6729 .attr_count = NFTA_FLOWTABLE_MAX,
6730 .policy = nft_flowtable_policy,
6732 [NFT_MSG_DELFLOWTABLE] = {
6733 .call_batch = nf_tables_delflowtable,
6734 .attr_count = NFTA_FLOWTABLE_MAX,
6735 .policy = nft_flowtable_policy,
6739 static int nf_tables_validate(struct net *net)
6741 struct nft_table *table;
6743 switch (net->nft.validate_state) {
6744 case NFT_VALIDATE_SKIP:
6746 case NFT_VALIDATE_NEED:
6747 nft_validate_state_update(net, NFT_VALIDATE_DO);
6749 case NFT_VALIDATE_DO:
6750 list_for_each_entry(table, &net->nft.tables, list) {
6751 if (nft_table_validate(net, table) < 0)
6760 /* a drop policy has to be deferred until all rules have been activated,
6761 * otherwise a large ruleset that contains a drop-policy base chain will
6762 * cause all packets to get dropped until the full transaction has been
6765 * We defer the drop policy until the transaction has been finalized.
6767 static void nft_chain_commit_drop_policy(struct nft_trans *trans)
6769 struct nft_base_chain *basechain;
6771 if (nft_trans_chain_policy(trans) != NF_DROP)
6774 if (!nft_is_base_chain(trans->ctx.chain))
6777 basechain = nft_base_chain(trans->ctx.chain);
6778 basechain->policy = NF_DROP;
6781 static void nft_chain_commit_update(struct nft_trans *trans)
6783 struct nft_base_chain *basechain;
6785 if (nft_trans_chain_name(trans)) {
6786 rhltable_remove(&trans->ctx.table->chains_ht,
6787 &trans->ctx.chain->rhlhead,
6788 nft_chain_ht_params);
6789 swap(trans->ctx.chain->name, nft_trans_chain_name(trans));
6790 rhltable_insert_key(&trans->ctx.table->chains_ht,
6791 trans->ctx.chain->name,
6792 &trans->ctx.chain->rhlhead,
6793 nft_chain_ht_params);
6796 if (!nft_is_base_chain(trans->ctx.chain))
6799 nft_chain_stats_replace(trans);
6801 basechain = nft_base_chain(trans->ctx.chain);
6803 switch (nft_trans_chain_policy(trans)) {
6806 basechain->policy = nft_trans_chain_policy(trans);
6811 static void nft_obj_commit_update(struct nft_trans *trans)
6813 struct nft_object *newobj;
6814 struct nft_object *obj;
6816 obj = nft_trans_obj(trans);
6817 newobj = nft_trans_obj_newobj(trans);
6819 if (obj->ops->update)
6820 obj->ops->update(obj, newobj);
6825 static void nft_commit_release(struct nft_trans *trans)
6827 switch (trans->msg_type) {
6828 case NFT_MSG_DELTABLE:
6829 nf_tables_table_destroy(&trans->ctx);
6831 case NFT_MSG_NEWCHAIN:
6832 free_percpu(nft_trans_chain_stats(trans));
6833 kfree(nft_trans_chain_name(trans));
6835 case NFT_MSG_DELCHAIN:
6836 nf_tables_chain_destroy(&trans->ctx);
6838 case NFT_MSG_DELRULE:
6839 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
6841 case NFT_MSG_DELSET:
6842 nft_set_destroy(nft_trans_set(trans));
6844 case NFT_MSG_DELSETELEM:
6845 nf_tables_set_elem_destroy(&trans->ctx,
6846 nft_trans_elem_set(trans),
6847 nft_trans_elem(trans).priv);
6849 case NFT_MSG_DELOBJ:
6850 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
6852 case NFT_MSG_DELFLOWTABLE:
6853 nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
6858 put_net(trans->ctx.net);
6863 static void nf_tables_trans_destroy_work(struct work_struct *w)
6865 struct nft_trans *trans, *next;
6868 spin_lock(&nf_tables_destroy_list_lock);
6869 list_splice_init(&nf_tables_destroy_list, &head);
6870 spin_unlock(&nf_tables_destroy_list_lock);
6872 if (list_empty(&head))
6877 list_for_each_entry_safe(trans, next, &head, list) {
6878 list_del(&trans->list);
6879 nft_commit_release(trans);
6883 static int nf_tables_commit_chain_prepare(struct net *net, struct nft_chain *chain)
6885 struct nft_rule *rule;
6886 unsigned int alloc = 0;
6889 /* already handled or inactive chain? */
6890 if (chain->rules_next || !nft_is_active_next(net, chain))
6893 rule = list_entry(&chain->rules, struct nft_rule, list);
6896 list_for_each_entry_continue(rule, &chain->rules, list) {
6897 if (nft_is_active_next(net, rule))
6901 chain->rules_next = nf_tables_chain_alloc_rules(chain, alloc);
6902 if (!chain->rules_next)
6905 list_for_each_entry_continue(rule, &chain->rules, list) {
6906 if (nft_is_active_next(net, rule))
6907 chain->rules_next[i++] = rule;
6910 chain->rules_next[i] = NULL;
6914 static void nf_tables_commit_chain_prepare_cancel(struct net *net)
6916 struct nft_trans *trans, *next;
6918 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
6919 struct nft_chain *chain = trans->ctx.chain;
6921 if (trans->msg_type == NFT_MSG_NEWRULE ||
6922 trans->msg_type == NFT_MSG_DELRULE) {
6923 kvfree(chain->rules_next);
6924 chain->rules_next = NULL;
6929 static void __nf_tables_commit_chain_free_rules_old(struct rcu_head *h)
6931 struct nft_rules_old *o = container_of(h, struct nft_rules_old, h);
6936 static void nf_tables_commit_chain_free_rules_old(struct nft_rule **rules)
6938 struct nft_rule **r = rules;
6939 struct nft_rules_old *old;
6944 r++; /* rcu_head is after end marker */
6948 call_rcu(&old->h, __nf_tables_commit_chain_free_rules_old);
6951 static void nf_tables_commit_chain(struct net *net, struct nft_chain *chain)
6953 struct nft_rule **g0, **g1;
6956 next_genbit = nft_gencursor_next(net);
6958 g0 = rcu_dereference_protected(chain->rules_gen_0,
6959 lockdep_commit_lock_is_held(net));
6960 g1 = rcu_dereference_protected(chain->rules_gen_1,
6961 lockdep_commit_lock_is_held(net));
6963 /* No changes to this chain? */
6964 if (chain->rules_next == NULL) {
6965 /* chain had no change in last or next generation */
6969 * chain had no change in this generation; make sure next
6970 * one uses same rules as current generation.
6973 rcu_assign_pointer(chain->rules_gen_1, g0);
6974 nf_tables_commit_chain_free_rules_old(g1);
6976 rcu_assign_pointer(chain->rules_gen_0, g1);
6977 nf_tables_commit_chain_free_rules_old(g0);
6984 rcu_assign_pointer(chain->rules_gen_1, chain->rules_next);
6986 rcu_assign_pointer(chain->rules_gen_0, chain->rules_next);
6988 chain->rules_next = NULL;
6994 nf_tables_commit_chain_free_rules_old(g1);
6996 nf_tables_commit_chain_free_rules_old(g0);
6999 static void nft_obj_del(struct nft_object *obj)
7001 rhltable_remove(&nft_objname_ht, &obj->rhlhead, nft_objname_ht_params);
7002 list_del_rcu(&obj->list);
7005 static void nft_chain_del(struct nft_chain *chain)
7007 struct nft_table *table = chain->table;
7009 WARN_ON_ONCE(rhltable_remove(&table->chains_ht, &chain->rhlhead,
7010 nft_chain_ht_params));
7011 list_del_rcu(&chain->list);
7014 static void nf_tables_module_autoload_cleanup(struct net *net)
7016 struct nft_module_request *req, *next;
7018 WARN_ON_ONCE(!list_empty(&net->nft.commit_list));
7019 list_for_each_entry_safe(req, next, &net->nft.module_list, list) {
7020 WARN_ON_ONCE(!req->done);
7021 list_del(&req->list);
7026 static void nf_tables_commit_release(struct net *net)
7028 struct nft_trans *trans;
7030 /* all side effects have to be made visible.
7031 * For example, if a chain named 'foo' has been deleted, a
7032 * new transaction must not find it anymore.
7034 * Memory reclaim happens asynchronously from work queue
7035 * to prevent expensive synchronize_rcu() in commit phase.
7037 if (list_empty(&net->nft.commit_list)) {
7038 nf_tables_module_autoload_cleanup(net);
7039 mutex_unlock(&net->nft.commit_mutex);
7043 trans = list_last_entry(&net->nft.commit_list,
7044 struct nft_trans, list);
7045 get_net(trans->ctx.net);
7046 WARN_ON_ONCE(trans->put_net);
7048 trans->put_net = true;
7049 spin_lock(&nf_tables_destroy_list_lock);
7050 list_splice_tail_init(&net->nft.commit_list, &nf_tables_destroy_list);
7051 spin_unlock(&nf_tables_destroy_list_lock);
7053 nf_tables_module_autoload_cleanup(net);
7054 mutex_unlock(&net->nft.commit_mutex);
7056 schedule_work(&trans_destroy_work);
7059 static int nf_tables_commit(struct net *net, struct sk_buff *skb)
7061 struct nft_trans *trans, *next;
7062 struct nft_trans_elem *te;
7063 struct nft_chain *chain;
7064 struct nft_table *table;
7067 if (list_empty(&net->nft.commit_list)) {
7068 mutex_unlock(&net->nft.commit_mutex);
7072 /* 0. Validate ruleset, otherwise roll back for error reporting. */
7073 if (nf_tables_validate(net) < 0)
7076 err = nft_flow_rule_offload_commit(net);
7080 /* 1. Allocate space for next generation rules_gen_X[] */
7081 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
7084 if (trans->msg_type == NFT_MSG_NEWRULE ||
7085 trans->msg_type == NFT_MSG_DELRULE) {
7086 chain = trans->ctx.chain;
7088 ret = nf_tables_commit_chain_prepare(net, chain);
7090 nf_tables_commit_chain_prepare_cancel(net);
7096 /* step 2. Make rules_gen_X visible to packet path */
7097 list_for_each_entry(table, &net->nft.tables, list) {
7098 list_for_each_entry(chain, &table->chains, list)
7099 nf_tables_commit_chain(net, chain);
7103 * Bump generation counter, invalidate any dump in progress.
7104 * Cannot fail after this point.
7106 while (++net->nft.base_seq == 0);
7108 /* step 3. Start new generation, rules_gen_X now in use. */
7109 net->nft.gencursor = nft_gencursor_next(net);
7111 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
7112 switch (trans->msg_type) {
7113 case NFT_MSG_NEWTABLE:
7114 if (nft_trans_table_update(trans)) {
7115 if (!nft_trans_table_enable(trans)) {
7116 nf_tables_table_disable(net,
7118 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
7121 nft_clear(net, trans->ctx.table);
7123 nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
7124 nft_trans_destroy(trans);
7126 case NFT_MSG_DELTABLE:
7127 list_del_rcu(&trans->ctx.table->list);
7128 nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE);
7130 case NFT_MSG_NEWCHAIN:
7131 if (nft_trans_chain_update(trans)) {
7132 nft_chain_commit_update(trans);
7133 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
7134 /* trans destroyed after rcu grace period */
7136 nft_chain_commit_drop_policy(trans);
7137 nft_clear(net, trans->ctx.chain);
7138 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
7139 nft_trans_destroy(trans);
7142 case NFT_MSG_DELCHAIN:
7143 nft_chain_del(trans->ctx.chain);
7144 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN);
7145 nf_tables_unregister_hook(trans->ctx.net,
7149 case NFT_MSG_NEWRULE:
7150 nft_clear(trans->ctx.net, nft_trans_rule(trans));
7151 nf_tables_rule_notify(&trans->ctx,
7152 nft_trans_rule(trans),
7154 nft_trans_destroy(trans);
7156 case NFT_MSG_DELRULE:
7157 list_del_rcu(&nft_trans_rule(trans)->list);
7158 nf_tables_rule_notify(&trans->ctx,
7159 nft_trans_rule(trans),
7161 nft_rule_expr_deactivate(&trans->ctx,
7162 nft_trans_rule(trans),
7165 case NFT_MSG_NEWSET:
7166 nft_clear(net, nft_trans_set(trans));
7167 /* This avoids hitting -EBUSY when deleting the table
7168 * from the transaction.
7170 if (nft_set_is_anonymous(nft_trans_set(trans)) &&
7171 !list_empty(&nft_trans_set(trans)->bindings))
7172 trans->ctx.table->use--;
7174 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
7175 NFT_MSG_NEWSET, GFP_KERNEL);
7176 nft_trans_destroy(trans);
7178 case NFT_MSG_DELSET:
7179 list_del_rcu(&nft_trans_set(trans)->list);
7180 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
7181 NFT_MSG_DELSET, GFP_KERNEL);
7183 case NFT_MSG_NEWSETELEM:
7184 te = (struct nft_trans_elem *)trans->data;
7186 te->set->ops->activate(net, te->set, &te->elem);
7187 nf_tables_setelem_notify(&trans->ctx, te->set,
7189 NFT_MSG_NEWSETELEM, 0);
7190 nft_trans_destroy(trans);
7192 case NFT_MSG_DELSETELEM:
7193 te = (struct nft_trans_elem *)trans->data;
7195 nf_tables_setelem_notify(&trans->ctx, te->set,
7197 NFT_MSG_DELSETELEM, 0);
7198 te->set->ops->remove(net, te->set, &te->elem);
7199 atomic_dec(&te->set->nelems);
7202 case NFT_MSG_NEWOBJ:
7203 if (nft_trans_obj_update(trans)) {
7204 nft_obj_commit_update(trans);
7205 nf_tables_obj_notify(&trans->ctx,
7206 nft_trans_obj(trans),
7209 nft_clear(net, nft_trans_obj(trans));
7210 nf_tables_obj_notify(&trans->ctx,
7211 nft_trans_obj(trans),
7213 nft_trans_destroy(trans);
7216 case NFT_MSG_DELOBJ:
7217 nft_obj_del(nft_trans_obj(trans));
7218 nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
7221 case NFT_MSG_NEWFLOWTABLE:
7222 nft_clear(net, nft_trans_flowtable(trans));
7223 nf_tables_flowtable_notify(&trans->ctx,
7224 nft_trans_flowtable(trans),
7225 NFT_MSG_NEWFLOWTABLE);
7226 nft_trans_destroy(trans);
7228 case NFT_MSG_DELFLOWTABLE:
7229 list_del_rcu(&nft_trans_flowtable(trans)->list);
7230 nf_tables_flowtable_notify(&trans->ctx,
7231 nft_trans_flowtable(trans),
7232 NFT_MSG_DELFLOWTABLE);
7233 nft_unregister_flowtable_net_hooks(net,
7234 nft_trans_flowtable(trans));
7239 nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
7240 nf_tables_commit_release(net);
7245 static void nf_tables_module_autoload(struct net *net)
7247 struct nft_module_request *req, *next;
7248 LIST_HEAD(module_list);
7250 list_splice_init(&net->nft.module_list, &module_list);
7251 mutex_unlock(&net->nft.commit_mutex);
7252 list_for_each_entry_safe(req, next, &module_list, list) {
7254 list_del(&req->list);
7257 request_module("%s", req->module);
7261 mutex_lock(&net->nft.commit_mutex);
7262 list_splice(&module_list, &net->nft.module_list);
7265 static void nf_tables_abort_release(struct nft_trans *trans)
7267 switch (trans->msg_type) {
7268 case NFT_MSG_NEWTABLE:
7269 nf_tables_table_destroy(&trans->ctx);
7271 case NFT_MSG_NEWCHAIN:
7272 nf_tables_chain_destroy(&trans->ctx);
7274 case NFT_MSG_NEWRULE:
7275 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
7277 case NFT_MSG_NEWSET:
7278 nft_set_destroy(nft_trans_set(trans));
7280 case NFT_MSG_NEWSETELEM:
7281 nft_set_elem_destroy(nft_trans_elem_set(trans),
7282 nft_trans_elem(trans).priv, true);
7284 case NFT_MSG_NEWOBJ:
7285 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
7287 case NFT_MSG_NEWFLOWTABLE:
7288 nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
7294 static int __nf_tables_abort(struct net *net, bool autoload)
7296 struct nft_trans *trans, *next;
7297 struct nft_trans_elem *te;
7299 list_for_each_entry_safe_reverse(trans, next, &net->nft.commit_list,
7301 switch (trans->msg_type) {
7302 case NFT_MSG_NEWTABLE:
7303 if (nft_trans_table_update(trans)) {
7304 if (nft_trans_table_enable(trans)) {
7305 nf_tables_table_disable(net,
7307 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
7309 nft_trans_destroy(trans);
7311 list_del_rcu(&trans->ctx.table->list);
7314 case NFT_MSG_DELTABLE:
7315 nft_clear(trans->ctx.net, trans->ctx.table);
7316 nft_trans_destroy(trans);
7318 case NFT_MSG_NEWCHAIN:
7319 if (nft_trans_chain_update(trans)) {
7320 free_percpu(nft_trans_chain_stats(trans));
7321 kfree(nft_trans_chain_name(trans));
7322 nft_trans_destroy(trans);
7324 trans->ctx.table->use--;
7325 nft_chain_del(trans->ctx.chain);
7326 nf_tables_unregister_hook(trans->ctx.net,
7331 case NFT_MSG_DELCHAIN:
7332 trans->ctx.table->use++;
7333 nft_clear(trans->ctx.net, trans->ctx.chain);
7334 nft_trans_destroy(trans);
7336 case NFT_MSG_NEWRULE:
7337 trans->ctx.chain->use--;
7338 list_del_rcu(&nft_trans_rule(trans)->list);
7339 nft_rule_expr_deactivate(&trans->ctx,
7340 nft_trans_rule(trans),
7343 case NFT_MSG_DELRULE:
7344 trans->ctx.chain->use++;
7345 nft_clear(trans->ctx.net, nft_trans_rule(trans));
7346 nft_rule_expr_activate(&trans->ctx, nft_trans_rule(trans));
7347 nft_trans_destroy(trans);
7349 case NFT_MSG_NEWSET:
7350 trans->ctx.table->use--;
7351 if (nft_trans_set_bound(trans)) {
7352 nft_trans_destroy(trans);
7355 list_del_rcu(&nft_trans_set(trans)->list);
7357 case NFT_MSG_DELSET:
7358 trans->ctx.table->use++;
7359 nft_clear(trans->ctx.net, nft_trans_set(trans));
7360 nft_trans_destroy(trans);
7362 case NFT_MSG_NEWSETELEM:
7363 if (nft_trans_elem_set_bound(trans)) {
7364 nft_trans_destroy(trans);
7367 te = (struct nft_trans_elem *)trans->data;
7368 te->set->ops->remove(net, te->set, &te->elem);
7369 atomic_dec(&te->set->nelems);
7371 case NFT_MSG_DELSETELEM:
7372 te = (struct nft_trans_elem *)trans->data;
7374 nft_set_elem_activate(net, te->set, &te->elem);
7375 te->set->ops->activate(net, te->set, &te->elem);
7378 nft_trans_destroy(trans);
7380 case NFT_MSG_NEWOBJ:
7381 if (nft_trans_obj_update(trans)) {
7382 kfree(nft_trans_obj_newobj(trans));
7383 nft_trans_destroy(trans);
7385 trans->ctx.table->use--;
7386 nft_obj_del(nft_trans_obj(trans));
7389 case NFT_MSG_DELOBJ:
7390 trans->ctx.table->use++;
7391 nft_clear(trans->ctx.net, nft_trans_obj(trans));
7392 nft_trans_destroy(trans);
7394 case NFT_MSG_NEWFLOWTABLE:
7395 trans->ctx.table->use--;
7396 list_del_rcu(&nft_trans_flowtable(trans)->list);
7397 nft_unregister_flowtable_net_hooks(net,
7398 nft_trans_flowtable(trans));
7400 case NFT_MSG_DELFLOWTABLE:
7401 trans->ctx.table->use++;
7402 nft_clear(trans->ctx.net, nft_trans_flowtable(trans));
7403 nft_trans_destroy(trans);
7410 list_for_each_entry_safe_reverse(trans, next,
7411 &net->nft.commit_list, list) {
7412 list_del(&trans->list);
7413 nf_tables_abort_release(trans);
7417 nf_tables_module_autoload(net);
7419 nf_tables_module_autoload_cleanup(net);
7424 static void nf_tables_cleanup(struct net *net)
7426 nft_validate_state_update(net, NFT_VALIDATE_SKIP);
7429 static int nf_tables_abort(struct net *net, struct sk_buff *skb, bool autoload)
7431 int ret = __nf_tables_abort(net, autoload);
7433 mutex_unlock(&net->nft.commit_mutex);
7438 static bool nf_tables_valid_genid(struct net *net, u32 genid)
7442 mutex_lock(&net->nft.commit_mutex);
7444 genid_ok = genid == 0 || net->nft.base_seq == genid;
7446 mutex_unlock(&net->nft.commit_mutex);
7448 /* else, commit mutex has to be released by commit or abort function */
7452 static const struct nfnetlink_subsystem nf_tables_subsys = {
7453 .name = "nf_tables",
7454 .subsys_id = NFNL_SUBSYS_NFTABLES,
7455 .cb_count = NFT_MSG_MAX,
7457 .commit = nf_tables_commit,
7458 .abort = nf_tables_abort,
7459 .cleanup = nf_tables_cleanup,
7460 .valid_genid = nf_tables_valid_genid,
7461 .owner = THIS_MODULE,
7464 int nft_chain_validate_dependency(const struct nft_chain *chain,
7465 enum nft_chain_types type)
7467 const struct nft_base_chain *basechain;
7469 if (nft_is_base_chain(chain)) {
7470 basechain = nft_base_chain(chain);
7471 if (basechain->type->type != type)
7476 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
7478 int nft_chain_validate_hooks(const struct nft_chain *chain,
7479 unsigned int hook_flags)
7481 struct nft_base_chain *basechain;
7483 if (nft_is_base_chain(chain)) {
7484 basechain = nft_base_chain(chain);
7486 if ((1 << basechain->ops.hooknum) & hook_flags)
7494 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
7497 * Loop detection - walk through the ruleset beginning at the destination chain
7498 * of a new jump until either the source chain is reached (loop) or all
7499 * reachable chains have been traversed.
7501 * The loop check is performed whenever a new jump verdict is added to an
7502 * expression or verdict map or a verdict map is bound to a new chain.
7505 static int nf_tables_check_loops(const struct nft_ctx *ctx,
7506 const struct nft_chain *chain);
7508 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
7509 struct nft_set *set,
7510 const struct nft_set_iter *iter,
7511 struct nft_set_elem *elem)
7513 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
7514 const struct nft_data *data;
7516 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
7517 *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
7520 data = nft_set_ext_data(ext);
7521 switch (data->verdict.code) {
7524 return nf_tables_check_loops(ctx, data->verdict.chain);
7530 static int nf_tables_check_loops(const struct nft_ctx *ctx,
7531 const struct nft_chain *chain)
7533 const struct nft_rule *rule;
7534 const struct nft_expr *expr, *last;
7535 struct nft_set *set;
7536 struct nft_set_binding *binding;
7537 struct nft_set_iter iter;
7539 if (ctx->chain == chain)
7542 list_for_each_entry(rule, &chain->rules, list) {
7543 nft_rule_for_each_expr(expr, last, rule) {
7544 struct nft_immediate_expr *priv;
7545 const struct nft_data *data;
7548 if (strcmp(expr->ops->type->name, "immediate"))
7551 priv = nft_expr_priv(expr);
7552 if (priv->dreg != NFT_REG_VERDICT)
7556 switch (data->verdict.code) {
7559 err = nf_tables_check_loops(ctx,
7560 data->verdict.chain);
7569 list_for_each_entry(set, &ctx->table->sets, list) {
7570 if (!nft_is_active_next(ctx->net, set))
7572 if (!(set->flags & NFT_SET_MAP) ||
7573 set->dtype != NFT_DATA_VERDICT)
7576 list_for_each_entry(binding, &set->bindings, list) {
7577 if (!(binding->flags & NFT_SET_MAP) ||
7578 binding->chain != chain)
7581 iter.genmask = nft_genmask_next(ctx->net);
7585 iter.fn = nf_tables_loop_check_setelem;
7587 set->ops->walk(ctx, set, &iter);
7597 * nft_parse_u32_check - fetch u32 attribute and check for maximum value
7599 * @attr: netlink attribute to fetch value from
7600 * @max: maximum value to be stored in dest
7601 * @dest: pointer to the variable
7603 * Parse, check and store a given u32 netlink attribute into variable.
7604 * This function returns -ERANGE if the value goes over maximum value.
7605 * Otherwise a 0 is returned and the attribute value is stored in the
7606 * destination variable.
7608 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
7612 val = ntohl(nla_get_be32(attr));
7619 EXPORT_SYMBOL_GPL(nft_parse_u32_check);
7622 * nft_parse_register - parse a register value from a netlink attribute
7624 * @attr: netlink attribute
7626 * Parse and translate a register value from a netlink attribute.
7627 * Registers used to be 128 bit wide, these register numbers will be
7628 * mapped to the corresponding 32 bit register numbers.
7630 unsigned int nft_parse_register(const struct nlattr *attr)
7634 reg = ntohl(nla_get_be32(attr));
7636 case NFT_REG_VERDICT...NFT_REG_4:
7637 return reg * NFT_REG_SIZE / NFT_REG32_SIZE;
7639 return reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
7642 EXPORT_SYMBOL_GPL(nft_parse_register);
7645 * nft_dump_register - dump a register value to a netlink attribute
7647 * @skb: socket buffer
7648 * @attr: attribute number
7649 * @reg: register number
7651 * Construct a netlink attribute containing the register number. For
7652 * compatibility reasons, register numbers being a multiple of 4 are
7653 * translated to the corresponding 128 bit register numbers.
7655 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
7657 if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
7658 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
7660 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
7662 return nla_put_be32(skb, attr, htonl(reg));
7664 EXPORT_SYMBOL_GPL(nft_dump_register);
7667 * nft_validate_register_load - validate a load from a register
7669 * @reg: the register number
7670 * @len: the length of the data
7672 * Validate that the input register is one of the general purpose
7673 * registers and that the length of the load is within the bounds.
7675 int nft_validate_register_load(enum nft_registers reg, unsigned int len)
7677 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
7681 if (reg * NFT_REG32_SIZE + len > sizeof_field(struct nft_regs, data))
7686 EXPORT_SYMBOL_GPL(nft_validate_register_load);
7689 * nft_validate_register_store - validate an expressions' register store
7691 * @ctx: context of the expression performing the load
7692 * @reg: the destination register number
7693 * @data: the data to load
7694 * @type: the data type
7695 * @len: the length of the data
7697 * Validate that a data load uses the appropriate data type for
7698 * the destination register and the length is within the bounds.
7699 * A value of NULL for the data means that its runtime gathered
7702 int nft_validate_register_store(const struct nft_ctx *ctx,
7703 enum nft_registers reg,
7704 const struct nft_data *data,
7705 enum nft_data_types type, unsigned int len)
7710 case NFT_REG_VERDICT:
7711 if (type != NFT_DATA_VERDICT)
7715 (data->verdict.code == NFT_GOTO ||
7716 data->verdict.code == NFT_JUMP)) {
7717 err = nf_tables_check_loops(ctx, data->verdict.chain);
7724 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
7728 if (reg * NFT_REG32_SIZE + len >
7729 sizeof_field(struct nft_regs, data))
7732 if (data != NULL && type != NFT_DATA_VALUE)
7737 EXPORT_SYMBOL_GPL(nft_validate_register_store);
7739 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
7740 [NFTA_VERDICT_CODE] = { .type = NLA_U32 },
7741 [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING,
7742 .len = NFT_CHAIN_MAXNAMELEN - 1 },
7745 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
7746 struct nft_data_desc *desc, const struct nlattr *nla)
7748 u8 genmask = nft_genmask_next(ctx->net);
7749 struct nlattr *tb[NFTA_VERDICT_MAX + 1];
7750 struct nft_chain *chain;
7753 err = nla_parse_nested_deprecated(tb, NFTA_VERDICT_MAX, nla,
7754 nft_verdict_policy, NULL);
7758 if (!tb[NFTA_VERDICT_CODE])
7760 data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
7762 switch (data->verdict.code) {
7764 switch (data->verdict.code & NF_VERDICT_MASK) {
7779 if (!tb[NFTA_VERDICT_CHAIN])
7781 chain = nft_chain_lookup(ctx->net, ctx->table,
7782 tb[NFTA_VERDICT_CHAIN], genmask);
7784 return PTR_ERR(chain);
7785 if (nft_is_base_chain(chain))
7789 data->verdict.chain = chain;
7793 desc->len = sizeof(data->verdict);
7794 desc->type = NFT_DATA_VERDICT;
7798 static void nft_verdict_uninit(const struct nft_data *data)
7800 switch (data->verdict.code) {
7803 data->verdict.chain->use--;
7808 int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
7810 struct nlattr *nest;
7812 nest = nla_nest_start_noflag(skb, type);
7814 goto nla_put_failure;
7816 if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
7817 goto nla_put_failure;
7822 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
7824 goto nla_put_failure;
7826 nla_nest_end(skb, nest);
7833 static int nft_value_init(const struct nft_ctx *ctx,
7834 struct nft_data *data, unsigned int size,
7835 struct nft_data_desc *desc, const struct nlattr *nla)
7845 nla_memcpy(data->data, nla, len);
7846 desc->type = NFT_DATA_VALUE;
7851 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
7854 return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
7857 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
7858 [NFTA_DATA_VALUE] = { .type = NLA_BINARY },
7859 [NFTA_DATA_VERDICT] = { .type = NLA_NESTED },
7863 * nft_data_init - parse nf_tables data netlink attributes
7865 * @ctx: context of the expression using the data
7866 * @data: destination struct nft_data
7867 * @size: maximum data length
7868 * @desc: data description
7869 * @nla: netlink attribute containing data
7871 * Parse the netlink data attributes and initialize a struct nft_data.
7872 * The type and length of data are returned in the data description.
7874 * The caller can indicate that it only wants to accept data of type
7875 * NFT_DATA_VALUE by passing NULL for the ctx argument.
7877 int nft_data_init(const struct nft_ctx *ctx,
7878 struct nft_data *data, unsigned int size,
7879 struct nft_data_desc *desc, const struct nlattr *nla)
7881 struct nlattr *tb[NFTA_DATA_MAX + 1];
7884 err = nla_parse_nested_deprecated(tb, NFTA_DATA_MAX, nla,
7885 nft_data_policy, NULL);
7889 if (tb[NFTA_DATA_VALUE])
7890 return nft_value_init(ctx, data, size, desc,
7891 tb[NFTA_DATA_VALUE]);
7892 if (tb[NFTA_DATA_VERDICT] && ctx != NULL)
7893 return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
7896 EXPORT_SYMBOL_GPL(nft_data_init);
7899 * nft_data_release - release a nft_data item
7901 * @data: struct nft_data to release
7902 * @type: type of data
7904 * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
7905 * all others need to be released by calling this function.
7907 void nft_data_release(const struct nft_data *data, enum nft_data_types type)
7909 if (type < NFT_DATA_VERDICT)
7912 case NFT_DATA_VERDICT:
7913 return nft_verdict_uninit(data);
7918 EXPORT_SYMBOL_GPL(nft_data_release);
7920 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
7921 enum nft_data_types type, unsigned int len)
7923 struct nlattr *nest;
7926 nest = nla_nest_start_noflag(skb, attr);
7931 case NFT_DATA_VALUE:
7932 err = nft_value_dump(skb, data, len);
7934 case NFT_DATA_VERDICT:
7935 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
7942 nla_nest_end(skb, nest);
7945 EXPORT_SYMBOL_GPL(nft_data_dump);
7947 int __nft_release_basechain(struct nft_ctx *ctx)
7949 struct nft_rule *rule, *nr;
7951 if (WARN_ON(!nft_is_base_chain(ctx->chain)))
7954 nf_tables_unregister_hook(ctx->net, ctx->chain->table, ctx->chain);
7955 list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
7956 list_del(&rule->list);
7958 nf_tables_rule_release(ctx, rule);
7960 nft_chain_del(ctx->chain);
7962 nf_tables_chain_destroy(ctx);
7966 EXPORT_SYMBOL_GPL(__nft_release_basechain);
7968 static void __nft_release_tables(struct net *net)
7970 struct nft_flowtable *flowtable, *nf;
7971 struct nft_table *table, *nt;
7972 struct nft_chain *chain, *nc;
7973 struct nft_object *obj, *ne;
7974 struct nft_rule *rule, *nr;
7975 struct nft_set *set, *ns;
7976 struct nft_ctx ctx = {
7978 .family = NFPROTO_NETDEV,
7981 list_for_each_entry_safe(table, nt, &net->nft.tables, list) {
7982 ctx.family = table->family;
7984 list_for_each_entry(chain, &table->chains, list)
7985 nf_tables_unregister_hook(net, table, chain);
7986 /* No packets are walking on these chains anymore. */
7988 list_for_each_entry(chain, &table->chains, list) {
7990 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
7991 list_del(&rule->list);
7993 nf_tables_rule_release(&ctx, rule);
7996 list_for_each_entry_safe(flowtable, nf, &table->flowtables, list) {
7997 list_del(&flowtable->list);
7999 nf_tables_flowtable_destroy(flowtable);
8001 list_for_each_entry_safe(set, ns, &table->sets, list) {
8002 list_del(&set->list);
8004 nft_set_destroy(set);
8006 list_for_each_entry_safe(obj, ne, &table->objects, list) {
8009 nft_obj_destroy(&ctx, obj);
8011 list_for_each_entry_safe(chain, nc, &table->chains, list) {
8013 nft_chain_del(chain);
8015 nf_tables_chain_destroy(&ctx);
8017 list_del(&table->list);
8018 nf_tables_table_destroy(&ctx);
8022 static int __net_init nf_tables_init_net(struct net *net)
8024 INIT_LIST_HEAD(&net->nft.tables);
8025 INIT_LIST_HEAD(&net->nft.commit_list);
8026 INIT_LIST_HEAD(&net->nft.module_list);
8027 mutex_init(&net->nft.commit_mutex);
8028 net->nft.base_seq = 1;
8029 net->nft.validate_state = NFT_VALIDATE_SKIP;
8034 static void __net_exit nf_tables_exit_net(struct net *net)
8036 mutex_lock(&net->nft.commit_mutex);
8037 if (!list_empty(&net->nft.commit_list))
8038 __nf_tables_abort(net, false);
8039 __nft_release_tables(net);
8040 mutex_unlock(&net->nft.commit_mutex);
8041 WARN_ON_ONCE(!list_empty(&net->nft.tables));
8044 static struct pernet_operations nf_tables_net_ops = {
8045 .init = nf_tables_init_net,
8046 .exit = nf_tables_exit_net,
8049 static int __init nf_tables_module_init(void)
8053 spin_lock_init(&nf_tables_destroy_list_lock);
8054 err = register_pernet_subsys(&nf_tables_net_ops);
8058 err = nft_chain_filter_init();
8062 err = nf_tables_core_module_init();
8066 err = register_netdevice_notifier(&nf_tables_flowtable_notifier);
8070 err = rhltable_init(&nft_objname_ht, &nft_objname_ht_params);
8074 err = nft_offload_init();
8079 err = nfnetlink_subsys_register(&nf_tables_subsys);
8083 nft_chain_route_init();
8089 rhltable_destroy(&nft_objname_ht);
8091 unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
8093 nf_tables_core_module_exit();
8095 nft_chain_filter_fini();
8097 unregister_pernet_subsys(&nf_tables_net_ops);
8101 static void __exit nf_tables_module_exit(void)
8103 nfnetlink_subsys_unregister(&nf_tables_subsys);
8105 unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
8106 nft_chain_filter_fini();
8107 nft_chain_route_fini();
8108 unregister_pernet_subsys(&nf_tables_net_ops);
8109 cancel_work_sync(&trans_destroy_work);
8111 rhltable_destroy(&nft_objname_ht);
8112 nf_tables_core_module_exit();
8115 module_init(nf_tables_module_init);
8116 module_exit(nf_tables_module_exit);
8118 MODULE_LICENSE("GPL");
8119 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
8120 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);