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/audit.h>
16 #include <linux/netfilter.h>
17 #include <linux/netfilter/nfnetlink.h>
18 #include <linux/netfilter/nf_tables.h>
19 #include <net/netfilter/nf_flow_table.h>
20 #include <net/netfilter/nf_tables_core.h>
21 #include <net/netfilter/nf_tables.h>
22 #include <net/netfilter/nf_tables_offload.h>
23 #include <net/net_namespace.h>
26 #define NFT_MODULE_AUTOLOAD_LIMIT (MODULE_NAME_LEN - sizeof("nft-expr-255-"))
28 static LIST_HEAD(nf_tables_expressions);
29 static LIST_HEAD(nf_tables_objects);
30 static LIST_HEAD(nf_tables_flowtables);
31 static LIST_HEAD(nf_tables_destroy_list);
32 static DEFINE_SPINLOCK(nf_tables_destroy_list_lock);
33 static u64 table_handle;
36 NFT_VALIDATE_SKIP = 0,
41 static struct rhltable nft_objname_ht;
43 static u32 nft_chain_hash(const void *data, u32 len, u32 seed);
44 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed);
45 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *, const void *);
47 static u32 nft_objname_hash(const void *data, u32 len, u32 seed);
48 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed);
49 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *, const void *);
51 static const struct rhashtable_params nft_chain_ht_params = {
52 .head_offset = offsetof(struct nft_chain, rhlhead),
53 .key_offset = offsetof(struct nft_chain, name),
54 .hashfn = nft_chain_hash,
55 .obj_hashfn = nft_chain_hash_obj,
56 .obj_cmpfn = nft_chain_hash_cmp,
57 .automatic_shrinking = true,
60 static const struct rhashtable_params nft_objname_ht_params = {
61 .head_offset = offsetof(struct nft_object, rhlhead),
62 .key_offset = offsetof(struct nft_object, key),
63 .hashfn = nft_objname_hash,
64 .obj_hashfn = nft_objname_hash_obj,
65 .obj_cmpfn = nft_objname_hash_cmp,
66 .automatic_shrinking = true,
69 static void nft_validate_state_update(struct net *net, u8 new_validate_state)
71 switch (net->nft.validate_state) {
72 case NFT_VALIDATE_SKIP:
73 WARN_ON_ONCE(new_validate_state == NFT_VALIDATE_DO);
75 case NFT_VALIDATE_NEED:
78 if (new_validate_state == NFT_VALIDATE_NEED)
82 net->nft.validate_state = new_validate_state;
84 static void nf_tables_trans_destroy_work(struct work_struct *w);
85 static DECLARE_WORK(trans_destroy_work, nf_tables_trans_destroy_work);
87 static void nft_ctx_init(struct nft_ctx *ctx,
89 const struct sk_buff *skb,
90 const struct nlmsghdr *nlh,
92 struct nft_table *table,
93 struct nft_chain *chain,
94 const struct nlattr * const *nla)
102 ctx->portid = NETLINK_CB(skb).portid;
103 ctx->report = nlmsg_report(nlh);
104 ctx->flags = nlh->nlmsg_flags;
105 ctx->seq = nlh->nlmsg_seq;
108 static struct nft_trans *nft_trans_alloc_gfp(const struct nft_ctx *ctx,
109 int msg_type, u32 size, gfp_t gfp)
111 struct nft_trans *trans;
113 trans = kzalloc(sizeof(struct nft_trans) + size, gfp);
117 trans->msg_type = msg_type;
123 static struct nft_trans *nft_trans_alloc(const struct nft_ctx *ctx,
124 int msg_type, u32 size)
126 return nft_trans_alloc_gfp(ctx, msg_type, size, GFP_KERNEL);
129 static void nft_trans_destroy(struct nft_trans *trans)
131 list_del(&trans->list);
135 static void nft_set_trans_bind(const struct nft_ctx *ctx, struct nft_set *set)
137 struct net *net = ctx->net;
138 struct nft_trans *trans;
140 if (!nft_set_is_anonymous(set))
143 list_for_each_entry_reverse(trans, &net->nft.commit_list, list) {
144 switch (trans->msg_type) {
146 if (nft_trans_set(trans) == set)
147 nft_trans_set_bound(trans) = true;
149 case NFT_MSG_NEWSETELEM:
150 if (nft_trans_elem_set(trans) == set)
151 nft_trans_elem_set_bound(trans) = true;
157 static int nft_netdev_register_hooks(struct net *net,
158 struct list_head *hook_list)
160 struct nft_hook *hook;
164 list_for_each_entry(hook, hook_list, list) {
165 err = nf_register_net_hook(net, &hook->ops);
174 list_for_each_entry(hook, hook_list, list) {
178 nf_unregister_net_hook(net, &hook->ops);
183 static void nft_netdev_unregister_hooks(struct net *net,
184 struct list_head *hook_list)
186 struct nft_hook *hook;
188 list_for_each_entry(hook, hook_list, list)
189 nf_unregister_net_hook(net, &hook->ops);
192 static int nf_tables_register_hook(struct net *net,
193 const struct nft_table *table,
194 struct nft_chain *chain)
196 struct nft_base_chain *basechain;
197 const struct nf_hook_ops *ops;
199 if (table->flags & NFT_TABLE_F_DORMANT ||
200 !nft_is_base_chain(chain))
203 basechain = nft_base_chain(chain);
204 ops = &basechain->ops;
206 if (basechain->type->ops_register)
207 return basechain->type->ops_register(net, ops);
209 if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
210 return nft_netdev_register_hooks(net, &basechain->hook_list);
212 return nf_register_net_hook(net, &basechain->ops);
215 static void nf_tables_unregister_hook(struct net *net,
216 const struct nft_table *table,
217 struct nft_chain *chain)
219 struct nft_base_chain *basechain;
220 const struct nf_hook_ops *ops;
222 if (table->flags & NFT_TABLE_F_DORMANT ||
223 !nft_is_base_chain(chain))
225 basechain = nft_base_chain(chain);
226 ops = &basechain->ops;
228 if (basechain->type->ops_unregister)
229 return basechain->type->ops_unregister(net, ops);
231 if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
232 nft_netdev_unregister_hooks(net, &basechain->hook_list);
234 nf_unregister_net_hook(net, &basechain->ops);
237 static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type)
239 struct nft_trans *trans;
241 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table));
245 if (msg_type == NFT_MSG_NEWTABLE)
246 nft_activate_next(ctx->net, ctx->table);
248 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
252 static int nft_deltable(struct nft_ctx *ctx)
256 err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE);
260 nft_deactivate_next(ctx->net, ctx->table);
264 static struct nft_trans *nft_trans_chain_add(struct nft_ctx *ctx, int msg_type)
266 struct nft_trans *trans;
268 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain));
270 return ERR_PTR(-ENOMEM);
272 if (msg_type == NFT_MSG_NEWCHAIN) {
273 nft_activate_next(ctx->net, ctx->chain);
275 if (ctx->nla[NFTA_CHAIN_ID]) {
276 nft_trans_chain_id(trans) =
277 ntohl(nla_get_be32(ctx->nla[NFTA_CHAIN_ID]));
281 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
285 static int nft_delchain(struct nft_ctx *ctx)
287 struct nft_trans *trans;
289 trans = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN);
291 return PTR_ERR(trans);
294 nft_deactivate_next(ctx->net, ctx->chain);
299 static void nft_rule_expr_activate(const struct nft_ctx *ctx,
300 struct nft_rule *rule)
302 struct nft_expr *expr;
304 expr = nft_expr_first(rule);
305 while (nft_expr_more(rule, expr)) {
306 if (expr->ops->activate)
307 expr->ops->activate(ctx, expr);
309 expr = nft_expr_next(expr);
313 static void nft_rule_expr_deactivate(const struct nft_ctx *ctx,
314 struct nft_rule *rule,
315 enum nft_trans_phase phase)
317 struct nft_expr *expr;
319 expr = nft_expr_first(rule);
320 while (nft_expr_more(rule, expr)) {
321 if (expr->ops->deactivate)
322 expr->ops->deactivate(ctx, expr, phase);
324 expr = nft_expr_next(expr);
329 nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule)
331 /* You cannot delete the same rule twice */
332 if (nft_is_active_next(ctx->net, rule)) {
333 nft_deactivate_next(ctx->net, rule);
340 static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type,
341 struct nft_rule *rule)
343 struct nft_trans *trans;
345 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule));
349 if (msg_type == NFT_MSG_NEWRULE && ctx->nla[NFTA_RULE_ID] != NULL) {
350 nft_trans_rule_id(trans) =
351 ntohl(nla_get_be32(ctx->nla[NFTA_RULE_ID]));
353 nft_trans_rule(trans) = rule;
354 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
359 static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule)
361 struct nft_flow_rule *flow;
362 struct nft_trans *trans;
365 trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule);
369 if (ctx->chain->flags & NFT_CHAIN_HW_OFFLOAD) {
370 flow = nft_flow_rule_create(ctx->net, rule);
372 nft_trans_destroy(trans);
373 return PTR_ERR(flow);
376 nft_trans_flow_rule(trans) = flow;
379 err = nf_tables_delrule_deactivate(ctx, rule);
381 nft_trans_destroy(trans);
384 nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_PREPARE);
389 static int nft_delrule_by_chain(struct nft_ctx *ctx)
391 struct nft_rule *rule;
394 list_for_each_entry(rule, &ctx->chain->rules, list) {
395 if (!nft_is_active_next(ctx->net, rule))
398 err = nft_delrule(ctx, rule);
405 static int nft_trans_set_add(const struct nft_ctx *ctx, int msg_type,
408 struct nft_trans *trans;
410 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
414 if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] != NULL) {
415 nft_trans_set_id(trans) =
416 ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
417 nft_activate_next(ctx->net, set);
419 nft_trans_set(trans) = set;
420 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
425 static int nft_delset(const struct nft_ctx *ctx, struct nft_set *set)
429 err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set);
433 nft_deactivate_next(ctx->net, set);
439 static int nft_trans_obj_add(struct nft_ctx *ctx, int msg_type,
440 struct nft_object *obj)
442 struct nft_trans *trans;
444 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_obj));
448 if (msg_type == NFT_MSG_NEWOBJ)
449 nft_activate_next(ctx->net, obj);
451 nft_trans_obj(trans) = obj;
452 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
457 static int nft_delobj(struct nft_ctx *ctx, struct nft_object *obj)
461 err = nft_trans_obj_add(ctx, NFT_MSG_DELOBJ, obj);
465 nft_deactivate_next(ctx->net, obj);
471 static int nft_trans_flowtable_add(struct nft_ctx *ctx, int msg_type,
472 struct nft_flowtable *flowtable)
474 struct nft_trans *trans;
476 trans = nft_trans_alloc(ctx, msg_type,
477 sizeof(struct nft_trans_flowtable));
481 if (msg_type == NFT_MSG_NEWFLOWTABLE)
482 nft_activate_next(ctx->net, flowtable);
484 nft_trans_flowtable(trans) = flowtable;
485 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
490 static int nft_delflowtable(struct nft_ctx *ctx,
491 struct nft_flowtable *flowtable)
495 err = nft_trans_flowtable_add(ctx, NFT_MSG_DELFLOWTABLE, flowtable);
499 nft_deactivate_next(ctx->net, flowtable);
509 static struct nft_table *nft_table_lookup(const struct net *net,
510 const struct nlattr *nla,
511 u8 family, u8 genmask, u32 nlpid)
513 struct nft_table *table;
516 return ERR_PTR(-EINVAL);
518 list_for_each_entry_rcu(table, &net->nft.tables, list,
519 lockdep_is_held(&net->nft.commit_mutex)) {
520 if (!nla_strcmp(nla, table->name) &&
521 table->family == family &&
522 nft_active_genmask(table, genmask)) {
523 if (nft_table_has_owner(table) &&
524 table->nlpid != nlpid)
525 return ERR_PTR(-EPERM);
531 return ERR_PTR(-ENOENT);
534 static struct nft_table *nft_table_lookup_byhandle(const struct net *net,
535 const struct nlattr *nla,
538 struct nft_table *table;
540 list_for_each_entry(table, &net->nft.tables, list) {
541 if (be64_to_cpu(nla_get_be64(nla)) == table->handle &&
542 nft_active_genmask(table, genmask))
546 return ERR_PTR(-ENOENT);
549 static inline u64 nf_tables_alloc_handle(struct nft_table *table)
551 return ++table->hgenerator;
554 static const struct nft_chain_type *chain_type[NFPROTO_NUMPROTO][NFT_CHAIN_T_MAX];
556 static const struct nft_chain_type *
557 __nft_chain_type_get(u8 family, enum nft_chain_types type)
559 if (family >= NFPROTO_NUMPROTO ||
560 type >= NFT_CHAIN_T_MAX)
563 return chain_type[family][type];
566 static const struct nft_chain_type *
567 __nf_tables_chain_type_lookup(const struct nlattr *nla, u8 family)
569 const struct nft_chain_type *type;
572 for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
573 type = __nft_chain_type_get(family, i);
576 if (!nla_strcmp(nla, type->name))
582 struct nft_module_request {
583 struct list_head list;
584 char module[MODULE_NAME_LEN];
588 #ifdef CONFIG_MODULES
589 static __printf(2, 3) int nft_request_module(struct net *net, const char *fmt,
592 char module_name[MODULE_NAME_LEN];
593 struct nft_module_request *req;
598 ret = vsnprintf(module_name, MODULE_NAME_LEN, fmt, args);
600 if (ret >= MODULE_NAME_LEN)
603 list_for_each_entry(req, &net->nft.module_list, list) {
604 if (!strcmp(req->module, module_name)) {
608 /* A request to load this module already exists. */
613 req = kmalloc(sizeof(*req), GFP_KERNEL);
618 strlcpy(req->module, module_name, MODULE_NAME_LEN);
619 list_add_tail(&req->list, &net->nft.module_list);
625 static void lockdep_nfnl_nft_mutex_not_held(void)
627 #ifdef CONFIG_PROVE_LOCKING
629 WARN_ON_ONCE(lockdep_nfnl_is_held(NFNL_SUBSYS_NFTABLES));
633 static const struct nft_chain_type *
634 nf_tables_chain_type_lookup(struct net *net, const struct nlattr *nla,
635 u8 family, bool autoload)
637 const struct nft_chain_type *type;
639 type = __nf_tables_chain_type_lookup(nla, family);
643 lockdep_nfnl_nft_mutex_not_held();
644 #ifdef CONFIG_MODULES
646 if (nft_request_module(net, "nft-chain-%u-%.*s", family,
648 (const char *)nla_data(nla)) == -EAGAIN)
649 return ERR_PTR(-EAGAIN);
652 return ERR_PTR(-ENOENT);
655 static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
656 [NFTA_TABLE_NAME] = { .type = NLA_STRING,
657 .len = NFT_TABLE_MAXNAMELEN - 1 },
658 [NFTA_TABLE_FLAGS] = { .type = NLA_U32 },
659 [NFTA_TABLE_HANDLE] = { .type = NLA_U64 },
660 [NFTA_TABLE_USERDATA] = { .type = NLA_BINARY,
661 .len = NFT_USERDATA_MAXLEN }
664 static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
665 u32 portid, u32 seq, int event, u32 flags,
666 int family, const struct nft_table *table)
668 struct nlmsghdr *nlh;
669 struct nfgenmsg *nfmsg;
671 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
672 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
674 goto nla_put_failure;
676 nfmsg = nlmsg_data(nlh);
677 nfmsg->nfgen_family = family;
678 nfmsg->version = NFNETLINK_V0;
679 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
681 if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
682 nla_put_be32(skb, NFTA_TABLE_FLAGS, htonl(table->flags)) ||
683 nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)) ||
684 nla_put_be64(skb, NFTA_TABLE_HANDLE, cpu_to_be64(table->handle),
686 goto nla_put_failure;
687 if (nft_table_has_owner(table) &&
688 nla_put_be32(skb, NFTA_TABLE_OWNER, htonl(table->nlpid)))
689 goto nla_put_failure;
692 if (nla_put(skb, NFTA_TABLE_USERDATA, table->udlen, table->udata))
693 goto nla_put_failure;
700 nlmsg_trim(skb, nlh);
704 struct nftnl_skb_parms {
707 #define NFT_CB(skb) (*(struct nftnl_skb_parms*)&((skb)->cb))
709 static void nft_notify_enqueue(struct sk_buff *skb, bool report,
710 struct list_head *notify_list)
712 NFT_CB(skb).report = report;
713 list_add_tail(&skb->list, notify_list);
716 static void nf_tables_table_notify(const struct nft_ctx *ctx, int event)
720 char *buf = kasprintf(GFP_KERNEL, "%s:%llu;?:0",
721 ctx->table->name, ctx->table->handle);
726 event == NFT_MSG_NEWTABLE ?
727 AUDIT_NFT_OP_TABLE_REGISTER :
728 AUDIT_NFT_OP_TABLE_UNREGISTER,
733 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
736 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
740 err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
741 event, 0, ctx->family, ctx->table);
747 nft_notify_enqueue(skb, ctx->report, &ctx->net->nft.notify_list);
750 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
753 static int nf_tables_dump_tables(struct sk_buff *skb,
754 struct netlink_callback *cb)
756 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
757 const struct nft_table *table;
758 unsigned int idx = 0, s_idx = cb->args[0];
759 struct net *net = sock_net(skb->sk);
760 int family = nfmsg->nfgen_family;
763 cb->seq = net->nft.base_seq;
765 list_for_each_entry_rcu(table, &net->nft.tables, list) {
766 if (family != NFPROTO_UNSPEC && family != table->family)
772 memset(&cb->args[1], 0,
773 sizeof(cb->args) - sizeof(cb->args[0]));
774 if (!nft_is_active(net, table))
776 if (nf_tables_fill_table_info(skb, net,
777 NETLINK_CB(cb->skb).portid,
779 NFT_MSG_NEWTABLE, NLM_F_MULTI,
780 table->family, table) < 0)
783 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
793 static int nft_netlink_dump_start_rcu(struct sock *nlsk, struct sk_buff *skb,
794 const struct nlmsghdr *nlh,
795 struct netlink_dump_control *c)
799 if (!try_module_get(THIS_MODULE))
803 err = netlink_dump_start(nlsk, skb, nlh, c);
805 module_put(THIS_MODULE);
810 /* called with rcu_read_lock held */
811 static int nf_tables_gettable(struct net *net, struct sock *nlsk,
812 struct sk_buff *skb, const struct nlmsghdr *nlh,
813 const struct nlattr * const nla[],
814 struct netlink_ext_ack *extack)
816 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
817 u8 genmask = nft_genmask_cur(net);
818 const struct nft_table *table;
819 struct sk_buff *skb2;
820 int family = nfmsg->nfgen_family;
823 if (nlh->nlmsg_flags & NLM_F_DUMP) {
824 struct netlink_dump_control c = {
825 .dump = nf_tables_dump_tables,
826 .module = THIS_MODULE,
829 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
832 table = nft_table_lookup(net, nla[NFTA_TABLE_NAME], family, genmask, 0);
834 NL_SET_BAD_ATTR(extack, nla[NFTA_TABLE_NAME]);
835 return PTR_ERR(table);
838 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
842 err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
843 nlh->nlmsg_seq, NFT_MSG_NEWTABLE, 0,
846 goto err_fill_table_info;
848 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
855 static void nft_table_disable(struct net *net, struct nft_table *table, u32 cnt)
857 struct nft_chain *chain;
860 list_for_each_entry(chain, &table->chains, list) {
861 if (!nft_is_active_next(net, chain))
863 if (!nft_is_base_chain(chain))
866 if (cnt && i++ == cnt)
869 nf_tables_unregister_hook(net, table, chain);
873 static int nf_tables_table_enable(struct net *net, struct nft_table *table)
875 struct nft_chain *chain;
878 list_for_each_entry(chain, &table->chains, list) {
879 if (!nft_is_active_next(net, chain))
881 if (!nft_is_base_chain(chain))
884 err = nf_tables_register_hook(net, table, chain);
886 goto err_register_hooks;
894 nft_table_disable(net, table, i);
898 static void nf_tables_table_disable(struct net *net, struct nft_table *table)
900 nft_table_disable(net, table, 0);
903 static int nf_tables_updtable(struct nft_ctx *ctx)
905 struct nft_trans *trans;
909 if (!ctx->nla[NFTA_TABLE_FLAGS])
912 flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
913 if (flags & ~NFT_TABLE_F_MASK)
916 if (flags == ctx->table->flags)
919 if ((nft_table_has_owner(ctx->table) &&
920 !(flags & NFT_TABLE_F_OWNER)) ||
921 (!nft_table_has_owner(ctx->table) &&
922 flags & NFT_TABLE_F_OWNER))
925 trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
926 sizeof(struct nft_trans_table));
930 if ((flags & NFT_TABLE_F_DORMANT) &&
931 !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
932 nft_trans_table_enable(trans) = false;
933 } else if (!(flags & NFT_TABLE_F_DORMANT) &&
934 ctx->table->flags & NFT_TABLE_F_DORMANT) {
935 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
936 ret = nf_tables_table_enable(ctx->net, ctx->table);
938 nft_trans_table_enable(trans) = true;
940 ctx->table->flags |= NFT_TABLE_F_DORMANT;
945 nft_trans_table_update(trans) = true;
946 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
949 nft_trans_destroy(trans);
953 static u32 nft_chain_hash(const void *data, u32 len, u32 seed)
955 const char *name = data;
957 return jhash(name, strlen(name), seed);
960 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed)
962 const struct nft_chain *chain = data;
964 return nft_chain_hash(chain->name, 0, seed);
967 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *arg,
970 const struct nft_chain *chain = ptr;
971 const char *name = arg->key;
973 return strcmp(chain->name, name);
976 static u32 nft_objname_hash(const void *data, u32 len, u32 seed)
978 const struct nft_object_hash_key *k = data;
980 seed ^= hash_ptr(k->table, 32);
982 return jhash(k->name, strlen(k->name), seed);
985 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed)
987 const struct nft_object *obj = data;
989 return nft_objname_hash(&obj->key, 0, seed);
992 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *arg,
995 const struct nft_object_hash_key *k = arg->key;
996 const struct nft_object *obj = ptr;
998 if (obj->key.table != k->table)
1001 return strcmp(obj->key.name, k->name);
1004 static int nf_tables_newtable(struct net *net, struct sock *nlsk,
1005 struct sk_buff *skb, const struct nlmsghdr *nlh,
1006 const struct nlattr * const nla[],
1007 struct netlink_ext_ack *extack)
1009 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1010 u8 genmask = nft_genmask_next(net);
1011 int family = nfmsg->nfgen_family;
1012 const struct nlattr *attr;
1013 struct nft_table *table;
1018 lockdep_assert_held(&net->nft.commit_mutex);
1019 attr = nla[NFTA_TABLE_NAME];
1020 table = nft_table_lookup(net, attr, family, genmask,
1021 NETLINK_CB(skb).portid);
1022 if (IS_ERR(table)) {
1023 if (PTR_ERR(table) != -ENOENT)
1024 return PTR_ERR(table);
1026 if (nlh->nlmsg_flags & NLM_F_EXCL) {
1027 NL_SET_BAD_ATTR(extack, attr);
1030 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1033 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
1034 return nf_tables_updtable(&ctx);
1037 if (nla[NFTA_TABLE_FLAGS]) {
1038 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
1039 if (flags & ~NFT_TABLE_F_MASK)
1044 table = kzalloc(sizeof(*table), GFP_KERNEL);
1048 table->name = nla_strdup(attr, GFP_KERNEL);
1049 if (table->name == NULL)
1052 if (nla[NFTA_TABLE_USERDATA]) {
1053 table->udata = nla_memdup(nla[NFTA_TABLE_USERDATA], GFP_KERNEL);
1054 if (table->udata == NULL)
1055 goto err_table_udata;
1057 table->udlen = nla_len(nla[NFTA_TABLE_USERDATA]);
1060 err = rhltable_init(&table->chains_ht, &nft_chain_ht_params);
1064 INIT_LIST_HEAD(&table->chains);
1065 INIT_LIST_HEAD(&table->sets);
1066 INIT_LIST_HEAD(&table->objects);
1067 INIT_LIST_HEAD(&table->flowtables);
1068 table->family = family;
1069 table->flags = flags;
1070 table->handle = ++table_handle;
1071 if (table->flags & NFT_TABLE_F_OWNER)
1072 table->nlpid = NETLINK_CB(skb).portid;
1074 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
1075 err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
1079 list_add_tail_rcu(&table->list, &net->nft.tables);
1082 rhltable_destroy(&table->chains_ht);
1084 kfree(table->udata);
1093 static int nft_flush_table(struct nft_ctx *ctx)
1095 struct nft_flowtable *flowtable, *nft;
1096 struct nft_chain *chain, *nc;
1097 struct nft_object *obj, *ne;
1098 struct nft_set *set, *ns;
1101 list_for_each_entry(chain, &ctx->table->chains, list) {
1102 if (!nft_is_active_next(ctx->net, chain))
1105 if (nft_chain_is_bound(chain))
1110 err = nft_delrule_by_chain(ctx);
1115 list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
1116 if (!nft_is_active_next(ctx->net, set))
1119 if (nft_set_is_anonymous(set) &&
1120 !list_empty(&set->bindings))
1123 err = nft_delset(ctx, set);
1128 list_for_each_entry_safe(flowtable, nft, &ctx->table->flowtables, list) {
1129 if (!nft_is_active_next(ctx->net, flowtable))
1132 err = nft_delflowtable(ctx, flowtable);
1137 list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) {
1138 if (!nft_is_active_next(ctx->net, obj))
1141 err = nft_delobj(ctx, obj);
1146 list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
1147 if (!nft_is_active_next(ctx->net, chain))
1150 if (nft_chain_is_bound(chain))
1155 err = nft_delchain(ctx);
1160 err = nft_deltable(ctx);
1165 static int nft_flush(struct nft_ctx *ctx, int family)
1167 struct nft_table *table, *nt;
1168 const struct nlattr * const *nla = ctx->nla;
1171 list_for_each_entry_safe(table, nt, &ctx->net->nft.tables, list) {
1172 if (family != AF_UNSPEC && table->family != family)
1175 ctx->family = table->family;
1177 if (!nft_is_active_next(ctx->net, table))
1180 if (nft_table_has_owner(table) && table->nlpid != ctx->portid)
1183 if (nla[NFTA_TABLE_NAME] &&
1184 nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
1189 err = nft_flush_table(ctx);
1197 static int nf_tables_deltable(struct net *net, struct sock *nlsk,
1198 struct sk_buff *skb, const struct nlmsghdr *nlh,
1199 const struct nlattr * const nla[],
1200 struct netlink_ext_ack *extack)
1202 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1203 u8 genmask = nft_genmask_next(net);
1204 int family = nfmsg->nfgen_family;
1205 const struct nlattr *attr;
1206 struct nft_table *table;
1209 nft_ctx_init(&ctx, net, skb, nlh, 0, NULL, NULL, nla);
1210 if (family == AF_UNSPEC ||
1211 (!nla[NFTA_TABLE_NAME] && !nla[NFTA_TABLE_HANDLE]))
1212 return nft_flush(&ctx, family);
1214 if (nla[NFTA_TABLE_HANDLE]) {
1215 attr = nla[NFTA_TABLE_HANDLE];
1216 table = nft_table_lookup_byhandle(net, attr, genmask);
1218 attr = nla[NFTA_TABLE_NAME];
1219 table = nft_table_lookup(net, attr, family, genmask,
1220 NETLINK_CB(skb).portid);
1223 if (IS_ERR(table)) {
1224 NL_SET_BAD_ATTR(extack, attr);
1225 return PTR_ERR(table);
1228 if (nlh->nlmsg_flags & NLM_F_NONREC &&
1232 ctx.family = family;
1235 return nft_flush_table(&ctx);
1238 static void nf_tables_table_destroy(struct nft_ctx *ctx)
1240 if (WARN_ON(ctx->table->use > 0))
1243 rhltable_destroy(&ctx->table->chains_ht);
1244 kfree(ctx->table->name);
1245 kfree(ctx->table->udata);
1249 void nft_register_chain_type(const struct nft_chain_type *ctype)
1251 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1252 if (WARN_ON(__nft_chain_type_get(ctype->family, ctype->type))) {
1253 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1256 chain_type[ctype->family][ctype->type] = ctype;
1257 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1259 EXPORT_SYMBOL_GPL(nft_register_chain_type);
1261 void nft_unregister_chain_type(const struct nft_chain_type *ctype)
1263 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1264 chain_type[ctype->family][ctype->type] = NULL;
1265 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1267 EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
1273 static struct nft_chain *
1274 nft_chain_lookup_byhandle(const struct nft_table *table, u64 handle, u8 genmask)
1276 struct nft_chain *chain;
1278 list_for_each_entry(chain, &table->chains, list) {
1279 if (chain->handle == handle &&
1280 nft_active_genmask(chain, genmask))
1284 return ERR_PTR(-ENOENT);
1287 static bool lockdep_commit_lock_is_held(const struct net *net)
1289 #ifdef CONFIG_PROVE_LOCKING
1290 return lockdep_is_held(&net->nft.commit_mutex);
1296 static struct nft_chain *nft_chain_lookup(struct net *net,
1297 struct nft_table *table,
1298 const struct nlattr *nla, u8 genmask)
1300 char search[NFT_CHAIN_MAXNAMELEN + 1];
1301 struct rhlist_head *tmp, *list;
1302 struct nft_chain *chain;
1305 return ERR_PTR(-EINVAL);
1307 nla_strscpy(search, nla, sizeof(search));
1309 WARN_ON(!rcu_read_lock_held() &&
1310 !lockdep_commit_lock_is_held(net));
1312 chain = ERR_PTR(-ENOENT);
1314 list = rhltable_lookup(&table->chains_ht, search, nft_chain_ht_params);
1318 rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
1319 if (nft_active_genmask(chain, genmask))
1322 chain = ERR_PTR(-ENOENT);
1328 static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
1329 [NFTA_CHAIN_TABLE] = { .type = NLA_STRING,
1330 .len = NFT_TABLE_MAXNAMELEN - 1 },
1331 [NFTA_CHAIN_HANDLE] = { .type = NLA_U64 },
1332 [NFTA_CHAIN_NAME] = { .type = NLA_STRING,
1333 .len = NFT_CHAIN_MAXNAMELEN - 1 },
1334 [NFTA_CHAIN_HOOK] = { .type = NLA_NESTED },
1335 [NFTA_CHAIN_POLICY] = { .type = NLA_U32 },
1336 [NFTA_CHAIN_TYPE] = { .type = NLA_STRING,
1337 .len = NFT_MODULE_AUTOLOAD_LIMIT },
1338 [NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED },
1339 [NFTA_CHAIN_FLAGS] = { .type = NLA_U32 },
1340 [NFTA_CHAIN_ID] = { .type = NLA_U32 },
1341 [NFTA_CHAIN_USERDATA] = { .type = NLA_BINARY,
1342 .len = NFT_USERDATA_MAXLEN },
1345 static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
1346 [NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 },
1347 [NFTA_HOOK_PRIORITY] = { .type = NLA_U32 },
1348 [NFTA_HOOK_DEV] = { .type = NLA_STRING,
1349 .len = IFNAMSIZ - 1 },
1352 static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
1354 struct nft_stats *cpu_stats, total;
1355 struct nlattr *nest;
1363 memset(&total, 0, sizeof(total));
1364 for_each_possible_cpu(cpu) {
1365 cpu_stats = per_cpu_ptr(stats, cpu);
1367 seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
1368 pkts = cpu_stats->pkts;
1369 bytes = cpu_stats->bytes;
1370 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq));
1372 total.bytes += bytes;
1374 nest = nla_nest_start_noflag(skb, NFTA_CHAIN_COUNTERS);
1376 goto nla_put_failure;
1378 if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts),
1379 NFTA_COUNTER_PAD) ||
1380 nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
1382 goto nla_put_failure;
1384 nla_nest_end(skb, nest);
1391 static int nft_dump_basechain_hook(struct sk_buff *skb, int family,
1392 const struct nft_base_chain *basechain)
1394 const struct nf_hook_ops *ops = &basechain->ops;
1395 struct nft_hook *hook, *first = NULL;
1396 struct nlattr *nest, *nest_devs;
1399 nest = nla_nest_start_noflag(skb, NFTA_CHAIN_HOOK);
1401 goto nla_put_failure;
1402 if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
1403 goto nla_put_failure;
1404 if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
1405 goto nla_put_failure;
1407 if (nft_base_chain_netdev(family, ops->hooknum)) {
1408 nest_devs = nla_nest_start_noflag(skb, NFTA_HOOK_DEVS);
1409 list_for_each_entry(hook, &basechain->hook_list, list) {
1413 if (nla_put_string(skb, NFTA_DEVICE_NAME,
1414 hook->ops.dev->name))
1415 goto nla_put_failure;
1418 nla_nest_end(skb, nest_devs);
1421 nla_put_string(skb, NFTA_HOOK_DEV, first->ops.dev->name))
1422 goto nla_put_failure;
1424 nla_nest_end(skb, nest);
1431 static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
1432 u32 portid, u32 seq, int event, u32 flags,
1433 int family, const struct nft_table *table,
1434 const struct nft_chain *chain)
1436 struct nlmsghdr *nlh;
1437 struct nfgenmsg *nfmsg;
1439 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
1440 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
1442 goto nla_put_failure;
1444 nfmsg = nlmsg_data(nlh);
1445 nfmsg->nfgen_family = family;
1446 nfmsg->version = NFNETLINK_V0;
1447 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
1449 if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name))
1450 goto nla_put_failure;
1451 if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle),
1453 goto nla_put_failure;
1454 if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name))
1455 goto nla_put_failure;
1457 if (nft_is_base_chain(chain)) {
1458 const struct nft_base_chain *basechain = nft_base_chain(chain);
1459 struct nft_stats __percpu *stats;
1461 if (nft_dump_basechain_hook(skb, family, basechain))
1462 goto nla_put_failure;
1464 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
1465 htonl(basechain->policy)))
1466 goto nla_put_failure;
1468 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
1469 goto nla_put_failure;
1471 stats = rcu_dereference_check(basechain->stats,
1472 lockdep_commit_lock_is_held(net));
1473 if (nft_dump_stats(skb, stats))
1474 goto nla_put_failure;
1478 nla_put_be32(skb, NFTA_CHAIN_FLAGS, htonl(chain->flags)))
1479 goto nla_put_failure;
1481 if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
1482 goto nla_put_failure;
1485 nla_put(skb, NFTA_CHAIN_USERDATA, chain->udlen, chain->udata))
1486 goto nla_put_failure;
1488 nlmsg_end(skb, nlh);
1492 nlmsg_trim(skb, nlh);
1496 static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event)
1498 struct sk_buff *skb;
1500 char *buf = kasprintf(GFP_KERNEL, "%s:%llu;%s:%llu",
1501 ctx->table->name, ctx->table->handle,
1502 ctx->chain->name, ctx->chain->handle);
1504 audit_log_nfcfg(buf,
1507 event == NFT_MSG_NEWCHAIN ?
1508 AUDIT_NFT_OP_CHAIN_REGISTER :
1509 AUDIT_NFT_OP_CHAIN_UNREGISTER,
1514 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1517 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1521 err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
1522 event, 0, ctx->family, ctx->table,
1529 nft_notify_enqueue(skb, ctx->report, &ctx->net->nft.notify_list);
1532 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
1535 static int nf_tables_dump_chains(struct sk_buff *skb,
1536 struct netlink_callback *cb)
1538 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1539 const struct nft_table *table;
1540 const struct nft_chain *chain;
1541 unsigned int idx = 0, s_idx = cb->args[0];
1542 struct net *net = sock_net(skb->sk);
1543 int family = nfmsg->nfgen_family;
1546 cb->seq = net->nft.base_seq;
1548 list_for_each_entry_rcu(table, &net->nft.tables, list) {
1549 if (family != NFPROTO_UNSPEC && family != table->family)
1552 list_for_each_entry_rcu(chain, &table->chains, list) {
1556 memset(&cb->args[1], 0,
1557 sizeof(cb->args) - sizeof(cb->args[0]));
1558 if (!nft_is_active(net, chain))
1560 if (nf_tables_fill_chain_info(skb, net,
1561 NETLINK_CB(cb->skb).portid,
1565 table->family, table,
1569 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1580 /* called with rcu_read_lock held */
1581 static int nf_tables_getchain(struct net *net, struct sock *nlsk,
1582 struct sk_buff *skb, const struct nlmsghdr *nlh,
1583 const struct nlattr * const nla[],
1584 struct netlink_ext_ack *extack)
1586 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1587 u8 genmask = nft_genmask_cur(net);
1588 const struct nft_chain *chain;
1589 struct nft_table *table;
1590 struct sk_buff *skb2;
1591 int family = nfmsg->nfgen_family;
1594 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1595 struct netlink_dump_control c = {
1596 .dump = nf_tables_dump_chains,
1597 .module = THIS_MODULE,
1600 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
1603 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask, 0);
1604 if (IS_ERR(table)) {
1605 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
1606 return PTR_ERR(table);
1609 chain = nft_chain_lookup(net, table, nla[NFTA_CHAIN_NAME], genmask);
1610 if (IS_ERR(chain)) {
1611 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
1612 return PTR_ERR(chain);
1615 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1619 err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
1620 nlh->nlmsg_seq, NFT_MSG_NEWCHAIN, 0,
1621 family, table, chain);
1623 goto err_fill_chain_info;
1625 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
1627 err_fill_chain_info:
1632 static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
1633 [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 },
1634 [NFTA_COUNTER_BYTES] = { .type = NLA_U64 },
1637 static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
1639 struct nlattr *tb[NFTA_COUNTER_MAX+1];
1640 struct nft_stats __percpu *newstats;
1641 struct nft_stats *stats;
1644 err = nla_parse_nested_deprecated(tb, NFTA_COUNTER_MAX, attr,
1645 nft_counter_policy, NULL);
1647 return ERR_PTR(err);
1649 if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
1650 return ERR_PTR(-EINVAL);
1652 newstats = netdev_alloc_pcpu_stats(struct nft_stats);
1653 if (newstats == NULL)
1654 return ERR_PTR(-ENOMEM);
1656 /* Restore old counters on this cpu, no problem. Per-cpu statistics
1657 * are not exposed to userspace.
1660 stats = this_cpu_ptr(newstats);
1661 stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
1662 stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
1668 static void nft_chain_stats_replace(struct nft_trans *trans)
1670 struct nft_base_chain *chain = nft_base_chain(trans->ctx.chain);
1672 if (!nft_trans_chain_stats(trans))
1675 nft_trans_chain_stats(trans) =
1676 rcu_replace_pointer(chain->stats, nft_trans_chain_stats(trans),
1677 lockdep_commit_lock_is_held(trans->ctx.net));
1679 if (!nft_trans_chain_stats(trans))
1680 static_branch_inc(&nft_counters_enabled);
1683 static void nf_tables_chain_free_chain_rules(struct nft_chain *chain)
1685 struct nft_rule **g0 = rcu_dereference_raw(chain->rules_gen_0);
1686 struct nft_rule **g1 = rcu_dereference_raw(chain->rules_gen_1);
1692 /* should be NULL either via abort or via successful commit */
1693 WARN_ON_ONCE(chain->rules_next);
1694 kvfree(chain->rules_next);
1697 void nf_tables_chain_destroy(struct nft_ctx *ctx)
1699 struct nft_chain *chain = ctx->chain;
1700 struct nft_hook *hook, *next;
1702 if (WARN_ON(chain->use > 0))
1705 /* no concurrent access possible anymore */
1706 nf_tables_chain_free_chain_rules(chain);
1708 if (nft_is_base_chain(chain)) {
1709 struct nft_base_chain *basechain = nft_base_chain(chain);
1711 if (nft_base_chain_netdev(ctx->family, basechain->ops.hooknum)) {
1712 list_for_each_entry_safe(hook, next,
1713 &basechain->hook_list, list) {
1714 list_del_rcu(&hook->list);
1715 kfree_rcu(hook, rcu);
1718 module_put(basechain->type->owner);
1719 if (rcu_access_pointer(basechain->stats)) {
1720 static_branch_dec(&nft_counters_enabled);
1721 free_percpu(rcu_dereference_raw(basechain->stats));
1724 kfree(chain->udata);
1728 kfree(chain->udata);
1733 static struct nft_hook *nft_netdev_hook_alloc(struct net *net,
1734 const struct nlattr *attr)
1736 struct net_device *dev;
1737 char ifname[IFNAMSIZ];
1738 struct nft_hook *hook;
1741 hook = kmalloc(sizeof(struct nft_hook), GFP_KERNEL);
1744 goto err_hook_alloc;
1747 nla_strscpy(ifname, attr, IFNAMSIZ);
1748 /* nf_tables_netdev_event() is called under rtnl_mutex, this is
1749 * indirectly serializing all the other holders of the commit_mutex with
1752 dev = __dev_get_by_name(net, ifname);
1757 hook->ops.dev = dev;
1758 hook->inactive = false;
1765 return ERR_PTR(err);
1768 static struct nft_hook *nft_hook_list_find(struct list_head *hook_list,
1769 const struct nft_hook *this)
1771 struct nft_hook *hook;
1773 list_for_each_entry(hook, hook_list, list) {
1774 if (this->ops.dev == hook->ops.dev)
1781 static int nf_tables_parse_netdev_hooks(struct net *net,
1782 const struct nlattr *attr,
1783 struct list_head *hook_list)
1785 struct nft_hook *hook, *next;
1786 const struct nlattr *tmp;
1787 int rem, n = 0, err;
1789 nla_for_each_nested(tmp, attr, rem) {
1790 if (nla_type(tmp) != NFTA_DEVICE_NAME) {
1795 hook = nft_netdev_hook_alloc(net, tmp);
1797 err = PTR_ERR(hook);
1800 if (nft_hook_list_find(hook_list, hook)) {
1805 list_add_tail(&hook->list, hook_list);
1808 if (n == NFT_NETDEVICE_MAX) {
1817 list_for_each_entry_safe(hook, next, hook_list, list) {
1818 list_del(&hook->list);
1824 struct nft_chain_hook {
1827 const struct nft_chain_type *type;
1828 struct list_head list;
1831 static int nft_chain_parse_netdev(struct net *net,
1832 struct nlattr *tb[],
1833 struct list_head *hook_list)
1835 struct nft_hook *hook;
1838 if (tb[NFTA_HOOK_DEV]) {
1839 hook = nft_netdev_hook_alloc(net, tb[NFTA_HOOK_DEV]);
1841 return PTR_ERR(hook);
1843 list_add_tail(&hook->list, hook_list);
1844 } else if (tb[NFTA_HOOK_DEVS]) {
1845 err = nf_tables_parse_netdev_hooks(net, tb[NFTA_HOOK_DEVS],
1850 if (list_empty(hook_list))
1859 static int nft_chain_parse_hook(struct net *net,
1860 const struct nlattr * const nla[],
1861 struct nft_chain_hook *hook, u8 family,
1864 struct nlattr *ha[NFTA_HOOK_MAX + 1];
1865 const struct nft_chain_type *type;
1868 lockdep_assert_held(&net->nft.commit_mutex);
1869 lockdep_nfnl_nft_mutex_not_held();
1871 err = nla_parse_nested_deprecated(ha, NFTA_HOOK_MAX,
1872 nla[NFTA_CHAIN_HOOK],
1873 nft_hook_policy, NULL);
1877 if (ha[NFTA_HOOK_HOOKNUM] == NULL ||
1878 ha[NFTA_HOOK_PRIORITY] == NULL)
1881 hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
1882 hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
1884 type = __nft_chain_type_get(family, NFT_CHAIN_T_DEFAULT);
1888 if (nla[NFTA_CHAIN_TYPE]) {
1889 type = nf_tables_chain_type_lookup(net, nla[NFTA_CHAIN_TYPE],
1892 return PTR_ERR(type);
1894 if (hook->num >= NFT_MAX_HOOKS || !(type->hook_mask & (1 << hook->num)))
1897 if (type->type == NFT_CHAIN_T_NAT &&
1898 hook->priority <= NF_IP_PRI_CONNTRACK)
1901 if (!try_module_get(type->owner))
1906 INIT_LIST_HEAD(&hook->list);
1907 if (nft_base_chain_netdev(family, hook->num)) {
1908 err = nft_chain_parse_netdev(net, ha, &hook->list);
1910 module_put(type->owner);
1913 } else if (ha[NFTA_HOOK_DEV] || ha[NFTA_HOOK_DEVS]) {
1914 module_put(type->owner);
1921 static void nft_chain_release_hook(struct nft_chain_hook *hook)
1923 struct nft_hook *h, *next;
1925 list_for_each_entry_safe(h, next, &hook->list, list) {
1929 module_put(hook->type->owner);
1932 struct nft_rules_old {
1934 struct nft_rule **start;
1937 static struct nft_rule **nf_tables_chain_alloc_rules(const struct nft_chain *chain,
1940 if (alloc > INT_MAX)
1943 alloc += 1; /* NULL, ends rules */
1944 if (sizeof(struct nft_rule *) > INT_MAX / alloc)
1947 alloc *= sizeof(struct nft_rule *);
1948 alloc += sizeof(struct nft_rules_old);
1950 return kvmalloc(alloc, GFP_KERNEL);
1953 static void nft_basechain_hook_init(struct nf_hook_ops *ops, u8 family,
1954 const struct nft_chain_hook *hook,
1955 struct nft_chain *chain)
1958 ops->hooknum = hook->num;
1959 ops->priority = hook->priority;
1961 ops->hook = hook->type->hooks[ops->hooknum];
1964 static int nft_basechain_init(struct nft_base_chain *basechain, u8 family,
1965 struct nft_chain_hook *hook, u32 flags)
1967 struct nft_chain *chain;
1970 basechain->type = hook->type;
1971 INIT_LIST_HEAD(&basechain->hook_list);
1972 chain = &basechain->chain;
1974 if (nft_base_chain_netdev(family, hook->num)) {
1975 list_splice_init(&hook->list, &basechain->hook_list);
1976 list_for_each_entry(h, &basechain->hook_list, list)
1977 nft_basechain_hook_init(&h->ops, family, hook, chain);
1979 basechain->ops.hooknum = hook->num;
1980 basechain->ops.priority = hook->priority;
1982 nft_basechain_hook_init(&basechain->ops, family, hook, chain);
1985 chain->flags |= NFT_CHAIN_BASE | flags;
1986 basechain->policy = NF_ACCEPT;
1987 if (chain->flags & NFT_CHAIN_HW_OFFLOAD &&
1988 nft_chain_offload_priority(basechain) < 0)
1991 flow_block_init(&basechain->flow_block);
1996 static int nft_chain_add(struct nft_table *table, struct nft_chain *chain)
2000 err = rhltable_insert_key(&table->chains_ht, chain->name,
2001 &chain->rhlhead, nft_chain_ht_params);
2005 list_add_tail_rcu(&chain->list, &table->chains);
2010 static u64 chain_id;
2012 static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask,
2013 u8 policy, u32 flags)
2015 const struct nlattr * const *nla = ctx->nla;
2016 struct nft_table *table = ctx->table;
2017 struct nft_base_chain *basechain;
2018 struct nft_stats __percpu *stats;
2019 struct net *net = ctx->net;
2020 char name[NFT_NAME_MAXLEN];
2021 struct nft_trans *trans;
2022 struct nft_chain *chain;
2023 struct nft_rule **rules;
2026 if (table->use == UINT_MAX)
2029 if (nla[NFTA_CHAIN_HOOK]) {
2030 struct nft_chain_hook hook;
2032 if (flags & NFT_CHAIN_BINDING)
2035 err = nft_chain_parse_hook(net, nla, &hook, family, true);
2039 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL);
2040 if (basechain == NULL) {
2041 nft_chain_release_hook(&hook);
2044 chain = &basechain->chain;
2046 if (nla[NFTA_CHAIN_COUNTERS]) {
2047 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2048 if (IS_ERR(stats)) {
2049 nft_chain_release_hook(&hook);
2051 return PTR_ERR(stats);
2053 rcu_assign_pointer(basechain->stats, stats);
2054 static_branch_inc(&nft_counters_enabled);
2057 err = nft_basechain_init(basechain, family, &hook, flags);
2059 nft_chain_release_hook(&hook);
2064 if (flags & NFT_CHAIN_BASE)
2066 if (flags & NFT_CHAIN_HW_OFFLOAD)
2069 chain = kzalloc(sizeof(*chain), GFP_KERNEL);
2073 chain->flags = flags;
2077 INIT_LIST_HEAD(&chain->rules);
2078 chain->handle = nf_tables_alloc_handle(table);
2079 chain->table = table;
2081 if (nla[NFTA_CHAIN_NAME]) {
2082 chain->name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL);
2084 if (!(flags & NFT_CHAIN_BINDING)) {
2086 goto err_destroy_chain;
2089 snprintf(name, sizeof(name), "__chain%llu", ++chain_id);
2090 chain->name = kstrdup(name, GFP_KERNEL);
2095 goto err_destroy_chain;
2098 if (nla[NFTA_CHAIN_USERDATA]) {
2099 chain->udata = nla_memdup(nla[NFTA_CHAIN_USERDATA], GFP_KERNEL);
2100 if (chain->udata == NULL) {
2102 goto err_destroy_chain;
2104 chain->udlen = nla_len(nla[NFTA_CHAIN_USERDATA]);
2107 rules = nf_tables_chain_alloc_rules(chain, 0);
2110 goto err_destroy_chain;
2114 rcu_assign_pointer(chain->rules_gen_0, rules);
2115 rcu_assign_pointer(chain->rules_gen_1, rules);
2117 err = nf_tables_register_hook(net, table, chain);
2119 goto err_destroy_chain;
2121 trans = nft_trans_chain_add(ctx, NFT_MSG_NEWCHAIN);
2122 if (IS_ERR(trans)) {
2123 err = PTR_ERR(trans);
2124 goto err_unregister_hook;
2127 nft_trans_chain_policy(trans) = NFT_CHAIN_POLICY_UNSET;
2128 if (nft_is_base_chain(chain))
2129 nft_trans_chain_policy(trans) = policy;
2131 err = nft_chain_add(table, chain);
2133 nft_trans_destroy(trans);
2134 goto err_unregister_hook;
2140 err_unregister_hook:
2141 nf_tables_unregister_hook(net, table, chain);
2143 nf_tables_chain_destroy(ctx);
2148 static bool nft_hook_list_equal(struct list_head *hook_list1,
2149 struct list_head *hook_list2)
2151 struct nft_hook *hook;
2155 list_for_each_entry(hook, hook_list2, list) {
2156 if (!nft_hook_list_find(hook_list1, hook))
2161 list_for_each_entry(hook, hook_list1, list)
2167 static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
2168 u32 flags, const struct nlattr *attr,
2169 struct netlink_ext_ack *extack)
2171 const struct nlattr * const *nla = ctx->nla;
2172 struct nft_table *table = ctx->table;
2173 struct nft_chain *chain = ctx->chain;
2174 struct nft_base_chain *basechain;
2175 struct nft_stats *stats = NULL;
2176 struct nft_chain_hook hook;
2177 struct nf_hook_ops *ops;
2178 struct nft_trans *trans;
2181 if (chain->flags ^ flags)
2184 if (nla[NFTA_CHAIN_HOOK]) {
2185 if (!nft_is_base_chain(chain)) {
2186 NL_SET_BAD_ATTR(extack, attr);
2189 err = nft_chain_parse_hook(ctx->net, nla, &hook, ctx->family,
2194 basechain = nft_base_chain(chain);
2195 if (basechain->type != hook.type) {
2196 nft_chain_release_hook(&hook);
2197 NL_SET_BAD_ATTR(extack, attr);
2201 if (nft_base_chain_netdev(ctx->family, hook.num)) {
2202 if (!nft_hook_list_equal(&basechain->hook_list,
2204 nft_chain_release_hook(&hook);
2205 NL_SET_BAD_ATTR(extack, attr);
2209 ops = &basechain->ops;
2210 if (ops->hooknum != hook.num ||
2211 ops->priority != hook.priority) {
2212 nft_chain_release_hook(&hook);
2213 NL_SET_BAD_ATTR(extack, attr);
2217 nft_chain_release_hook(&hook);
2220 if (nla[NFTA_CHAIN_HANDLE] &&
2221 nla[NFTA_CHAIN_NAME]) {
2222 struct nft_chain *chain2;
2224 chain2 = nft_chain_lookup(ctx->net, table,
2225 nla[NFTA_CHAIN_NAME], genmask);
2226 if (!IS_ERR(chain2)) {
2227 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2232 if (nla[NFTA_CHAIN_COUNTERS]) {
2233 if (!nft_is_base_chain(chain))
2236 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2238 return PTR_ERR(stats);
2242 trans = nft_trans_alloc(ctx, NFT_MSG_NEWCHAIN,
2243 sizeof(struct nft_trans_chain));
2247 nft_trans_chain_stats(trans) = stats;
2248 nft_trans_chain_update(trans) = true;
2250 if (nla[NFTA_CHAIN_POLICY])
2251 nft_trans_chain_policy(trans) = policy;
2253 nft_trans_chain_policy(trans) = -1;
2255 if (nla[NFTA_CHAIN_HANDLE] &&
2256 nla[NFTA_CHAIN_NAME]) {
2257 struct nft_trans *tmp;
2261 name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL);
2266 list_for_each_entry(tmp, &ctx->net->nft.commit_list, list) {
2267 if (tmp->msg_type == NFT_MSG_NEWCHAIN &&
2268 tmp->ctx.table == table &&
2269 nft_trans_chain_update(tmp) &&
2270 nft_trans_chain_name(tmp) &&
2271 strcmp(name, nft_trans_chain_name(tmp)) == 0) {
2272 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2278 nft_trans_chain_name(trans) = name;
2280 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
2289 static struct nft_chain *nft_chain_lookup_byid(const struct net *net,
2290 const struct nlattr *nla)
2292 u32 id = ntohl(nla_get_be32(nla));
2293 struct nft_trans *trans;
2295 list_for_each_entry(trans, &net->nft.commit_list, list) {
2296 struct nft_chain *chain = trans->ctx.chain;
2298 if (trans->msg_type == NFT_MSG_NEWCHAIN &&
2299 id == nft_trans_chain_id(trans))
2302 return ERR_PTR(-ENOENT);
2305 static int nf_tables_newchain(struct net *net, struct sock *nlsk,
2306 struct sk_buff *skb, const struct nlmsghdr *nlh,
2307 const struct nlattr * const nla[],
2308 struct netlink_ext_ack *extack)
2310 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2311 u8 genmask = nft_genmask_next(net);
2312 int family = nfmsg->nfgen_family;
2313 struct nft_chain *chain = NULL;
2314 const struct nlattr *attr;
2315 struct nft_table *table;
2316 u8 policy = NF_ACCEPT;
2321 lockdep_assert_held(&net->nft.commit_mutex);
2323 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2324 NETLINK_CB(skb).portid);
2325 if (IS_ERR(table)) {
2326 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2327 return PTR_ERR(table);
2331 attr = nla[NFTA_CHAIN_NAME];
2333 if (nla[NFTA_CHAIN_HANDLE]) {
2334 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
2335 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2336 if (IS_ERR(chain)) {
2337 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_HANDLE]);
2338 return PTR_ERR(chain);
2340 attr = nla[NFTA_CHAIN_HANDLE];
2341 } else if (nla[NFTA_CHAIN_NAME]) {
2342 chain = nft_chain_lookup(net, table, attr, genmask);
2343 if (IS_ERR(chain)) {
2344 if (PTR_ERR(chain) != -ENOENT) {
2345 NL_SET_BAD_ATTR(extack, attr);
2346 return PTR_ERR(chain);
2350 } else if (!nla[NFTA_CHAIN_ID]) {
2354 if (nla[NFTA_CHAIN_POLICY]) {
2355 if (chain != NULL &&
2356 !nft_is_base_chain(chain)) {
2357 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2361 if (chain == NULL &&
2362 nla[NFTA_CHAIN_HOOK] == NULL) {
2363 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2367 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
2377 if (nla[NFTA_CHAIN_FLAGS])
2378 flags = ntohl(nla_get_be32(nla[NFTA_CHAIN_FLAGS]));
2380 flags = chain->flags;
2382 if (flags & ~NFT_CHAIN_FLAGS)
2385 nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
2387 if (chain != NULL) {
2388 if (nlh->nlmsg_flags & NLM_F_EXCL) {
2389 NL_SET_BAD_ATTR(extack, attr);
2392 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2395 flags |= chain->flags & NFT_CHAIN_BASE;
2396 return nf_tables_updchain(&ctx, genmask, policy, flags, attr,
2400 return nf_tables_addchain(&ctx, family, genmask, policy, flags);
2403 static int nf_tables_delchain(struct net *net, struct sock *nlsk,
2404 struct sk_buff *skb, const struct nlmsghdr *nlh,
2405 const struct nlattr * const nla[],
2406 struct netlink_ext_ack *extack)
2408 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2409 u8 genmask = nft_genmask_next(net);
2410 int family = nfmsg->nfgen_family;
2411 const struct nlattr *attr;
2412 struct nft_table *table;
2413 struct nft_chain *chain;
2414 struct nft_rule *rule;
2420 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2421 NETLINK_CB(skb).portid);
2422 if (IS_ERR(table)) {
2423 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2424 return PTR_ERR(table);
2427 if (nla[NFTA_CHAIN_HANDLE]) {
2428 attr = nla[NFTA_CHAIN_HANDLE];
2429 handle = be64_to_cpu(nla_get_be64(attr));
2430 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2432 attr = nla[NFTA_CHAIN_NAME];
2433 chain = nft_chain_lookup(net, table, attr, genmask);
2435 if (IS_ERR(chain)) {
2436 NL_SET_BAD_ATTR(extack, attr);
2437 return PTR_ERR(chain);
2440 if (nlh->nlmsg_flags & NLM_F_NONREC &&
2444 nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
2447 list_for_each_entry(rule, &chain->rules, list) {
2448 if (!nft_is_active_next(net, rule))
2452 err = nft_delrule(&ctx, rule);
2457 /* There are rules and elements that are still holding references to us,
2458 * we cannot do a recursive removal in this case.
2461 NL_SET_BAD_ATTR(extack, attr);
2465 return nft_delchain(&ctx);
2473 * nft_register_expr - register nf_tables expr type
2476 * Registers the expr type for use with nf_tables. Returns zero on
2477 * success or a negative errno code otherwise.
2479 int nft_register_expr(struct nft_expr_type *type)
2481 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2482 if (type->family == NFPROTO_UNSPEC)
2483 list_add_tail_rcu(&type->list, &nf_tables_expressions);
2485 list_add_rcu(&type->list, &nf_tables_expressions);
2486 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2489 EXPORT_SYMBOL_GPL(nft_register_expr);
2492 * nft_unregister_expr - unregister nf_tables expr type
2495 * Unregisters the expr typefor use with nf_tables.
2497 void nft_unregister_expr(struct nft_expr_type *type)
2499 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2500 list_del_rcu(&type->list);
2501 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2503 EXPORT_SYMBOL_GPL(nft_unregister_expr);
2505 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
2508 const struct nft_expr_type *type, *candidate = NULL;
2510 list_for_each_entry(type, &nf_tables_expressions, list) {
2511 if (!nla_strcmp(nla, type->name)) {
2512 if (!type->family && !candidate)
2514 else if (type->family == family)
2521 #ifdef CONFIG_MODULES
2522 static int nft_expr_type_request_module(struct net *net, u8 family,
2525 if (nft_request_module(net, "nft-expr-%u-%.*s", family,
2526 nla_len(nla), (char *)nla_data(nla)) == -EAGAIN)
2533 static const struct nft_expr_type *nft_expr_type_get(struct net *net,
2537 const struct nft_expr_type *type;
2540 return ERR_PTR(-EINVAL);
2542 type = __nft_expr_type_get(family, nla);
2543 if (type != NULL && try_module_get(type->owner))
2546 lockdep_nfnl_nft_mutex_not_held();
2547 #ifdef CONFIG_MODULES
2549 if (nft_expr_type_request_module(net, family, nla) == -EAGAIN)
2550 return ERR_PTR(-EAGAIN);
2552 if (nft_request_module(net, "nft-expr-%.*s",
2554 (char *)nla_data(nla)) == -EAGAIN)
2555 return ERR_PTR(-EAGAIN);
2558 return ERR_PTR(-ENOENT);
2561 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
2562 [NFTA_EXPR_NAME] = { .type = NLA_STRING,
2563 .len = NFT_MODULE_AUTOLOAD_LIMIT },
2564 [NFTA_EXPR_DATA] = { .type = NLA_NESTED },
2567 static int nf_tables_fill_expr_info(struct sk_buff *skb,
2568 const struct nft_expr *expr)
2570 if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
2571 goto nla_put_failure;
2573 if (expr->ops->dump) {
2574 struct nlattr *data = nla_nest_start_noflag(skb,
2577 goto nla_put_failure;
2578 if (expr->ops->dump(skb, expr) < 0)
2579 goto nla_put_failure;
2580 nla_nest_end(skb, data);
2589 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
2590 const struct nft_expr *expr)
2592 struct nlattr *nest;
2594 nest = nla_nest_start_noflag(skb, attr);
2596 goto nla_put_failure;
2597 if (nf_tables_fill_expr_info(skb, expr) < 0)
2598 goto nla_put_failure;
2599 nla_nest_end(skb, nest);
2606 struct nft_expr_info {
2607 const struct nft_expr_ops *ops;
2608 const struct nlattr *attr;
2609 struct nlattr *tb[NFT_EXPR_MAXATTR + 1];
2612 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
2613 const struct nlattr *nla,
2614 struct nft_expr_info *info)
2616 const struct nft_expr_type *type;
2617 const struct nft_expr_ops *ops;
2618 struct nlattr *tb[NFTA_EXPR_MAX + 1];
2621 err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
2622 nft_expr_policy, NULL);
2626 type = nft_expr_type_get(ctx->net, ctx->family, tb[NFTA_EXPR_NAME]);
2628 return PTR_ERR(type);
2630 if (tb[NFTA_EXPR_DATA]) {
2631 err = nla_parse_nested_deprecated(info->tb, type->maxattr,
2633 type->policy, NULL);
2637 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
2639 if (type->select_ops != NULL) {
2640 ops = type->select_ops(ctx,
2641 (const struct nlattr * const *)info->tb);
2644 #ifdef CONFIG_MODULES
2646 if (nft_expr_type_request_module(ctx->net,
2648 tb[NFTA_EXPR_NAME]) != -EAGAIN)
2662 module_put(type->owner);
2666 static int nf_tables_newexpr(const struct nft_ctx *ctx,
2667 const struct nft_expr_info *info,
2668 struct nft_expr *expr)
2670 const struct nft_expr_ops *ops = info->ops;
2675 err = ops->init(ctx, expr, (const struct nlattr **)info->tb);
2686 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
2687 struct nft_expr *expr)
2689 const struct nft_expr_type *type = expr->ops->type;
2691 if (expr->ops->destroy)
2692 expr->ops->destroy(ctx, expr);
2693 module_put(type->owner);
2696 static struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
2697 const struct nlattr *nla)
2699 struct nft_expr_info info;
2700 struct nft_expr *expr;
2701 struct module *owner;
2704 err = nf_tables_expr_parse(ctx, nla, &info);
2709 expr = kzalloc(info.ops->size, GFP_KERNEL);
2713 err = nf_tables_newexpr(ctx, &info, expr);
2721 owner = info.ops->type->owner;
2722 if (info.ops->type->release_ops)
2723 info.ops->type->release_ops(info.ops);
2727 return ERR_PTR(err);
2730 int nft_expr_clone(struct nft_expr *dst, struct nft_expr *src)
2734 if (src->ops->clone) {
2735 dst->ops = src->ops;
2736 err = src->ops->clone(dst, src);
2740 memcpy(dst, src, src->ops->size);
2743 __module_get(src->ops->type->owner);
2748 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
2750 nf_tables_expr_destroy(ctx, expr);
2758 static struct nft_rule *__nft_rule_lookup(const struct nft_chain *chain,
2761 struct nft_rule *rule;
2763 // FIXME: this sucks
2764 list_for_each_entry_rcu(rule, &chain->rules, list) {
2765 if (handle == rule->handle)
2769 return ERR_PTR(-ENOENT);
2772 static struct nft_rule *nft_rule_lookup(const struct nft_chain *chain,
2773 const struct nlattr *nla)
2776 return ERR_PTR(-EINVAL);
2778 return __nft_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
2781 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
2782 [NFTA_RULE_TABLE] = { .type = NLA_STRING,
2783 .len = NFT_TABLE_MAXNAMELEN - 1 },
2784 [NFTA_RULE_CHAIN] = { .type = NLA_STRING,
2785 .len = NFT_CHAIN_MAXNAMELEN - 1 },
2786 [NFTA_RULE_HANDLE] = { .type = NLA_U64 },
2787 [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
2788 [NFTA_RULE_COMPAT] = { .type = NLA_NESTED },
2789 [NFTA_RULE_POSITION] = { .type = NLA_U64 },
2790 [NFTA_RULE_USERDATA] = { .type = NLA_BINARY,
2791 .len = NFT_USERDATA_MAXLEN },
2792 [NFTA_RULE_ID] = { .type = NLA_U32 },
2793 [NFTA_RULE_POSITION_ID] = { .type = NLA_U32 },
2794 [NFTA_RULE_CHAIN_ID] = { .type = NLA_U32 },
2797 static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
2798 u32 portid, u32 seq, int event,
2799 u32 flags, int family,
2800 const struct nft_table *table,
2801 const struct nft_chain *chain,
2802 const struct nft_rule *rule,
2803 const struct nft_rule *prule)
2805 struct nlmsghdr *nlh;
2806 struct nfgenmsg *nfmsg;
2807 const struct nft_expr *expr, *next;
2808 struct nlattr *list;
2809 u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
2811 nlh = nlmsg_put(skb, portid, seq, type, sizeof(struct nfgenmsg), flags);
2813 goto nla_put_failure;
2815 nfmsg = nlmsg_data(nlh);
2816 nfmsg->nfgen_family = family;
2817 nfmsg->version = NFNETLINK_V0;
2818 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
2820 if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
2821 goto nla_put_failure;
2822 if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
2823 goto nla_put_failure;
2824 if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
2826 goto nla_put_failure;
2828 if (event != NFT_MSG_DELRULE && prule) {
2829 if (nla_put_be64(skb, NFTA_RULE_POSITION,
2830 cpu_to_be64(prule->handle),
2832 goto nla_put_failure;
2835 list = nla_nest_start_noflag(skb, NFTA_RULE_EXPRESSIONS);
2837 goto nla_put_failure;
2838 nft_rule_for_each_expr(expr, next, rule) {
2839 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
2840 goto nla_put_failure;
2842 nla_nest_end(skb, list);
2845 struct nft_userdata *udata = nft_userdata(rule);
2846 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
2848 goto nla_put_failure;
2851 nlmsg_end(skb, nlh);
2855 nlmsg_trim(skb, nlh);
2859 static void nf_tables_rule_notify(const struct nft_ctx *ctx,
2860 const struct nft_rule *rule, int event)
2862 struct sk_buff *skb;
2864 char *buf = kasprintf(GFP_KERNEL, "%s:%llu;%s:%llu",
2865 ctx->table->name, ctx->table->handle,
2866 ctx->chain->name, ctx->chain->handle);
2868 audit_log_nfcfg(buf,
2871 event == NFT_MSG_NEWRULE ?
2872 AUDIT_NFT_OP_RULE_REGISTER :
2873 AUDIT_NFT_OP_RULE_UNREGISTER,
2878 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
2881 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
2885 err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
2886 event, 0, ctx->family, ctx->table,
2887 ctx->chain, rule, NULL);
2893 nft_notify_enqueue(skb, ctx->report, &ctx->net->nft.notify_list);
2896 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
2899 struct nft_rule_dump_ctx {
2904 static int __nf_tables_dump_rules(struct sk_buff *skb,
2906 struct netlink_callback *cb,
2907 const struct nft_table *table,
2908 const struct nft_chain *chain)
2910 struct net *net = sock_net(skb->sk);
2911 const struct nft_rule *rule, *prule;
2912 unsigned int s_idx = cb->args[0];
2915 list_for_each_entry_rcu(rule, &chain->rules, list) {
2916 if (!nft_is_active(net, rule))
2921 memset(&cb->args[1], 0,
2922 sizeof(cb->args) - sizeof(cb->args[0]));
2924 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
2927 NLM_F_MULTI | NLM_F_APPEND,
2929 table, chain, rule, prule) < 0)
2932 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
2941 static int nf_tables_dump_rules(struct sk_buff *skb,
2942 struct netlink_callback *cb)
2944 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
2945 const struct nft_rule_dump_ctx *ctx = cb->data;
2946 struct nft_table *table;
2947 const struct nft_chain *chain;
2948 unsigned int idx = 0;
2949 struct net *net = sock_net(skb->sk);
2950 int family = nfmsg->nfgen_family;
2953 cb->seq = net->nft.base_seq;
2955 list_for_each_entry_rcu(table, &net->nft.tables, list) {
2956 if (family != NFPROTO_UNSPEC && family != table->family)
2959 if (ctx && ctx->table && strcmp(ctx->table, table->name) != 0)
2962 if (ctx && ctx->table && ctx->chain) {
2963 struct rhlist_head *list, *tmp;
2965 list = rhltable_lookup(&table->chains_ht, ctx->chain,
2966 nft_chain_ht_params);
2970 rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
2971 if (!nft_is_active(net, chain))
2973 __nf_tables_dump_rules(skb, &idx,
2980 list_for_each_entry_rcu(chain, &table->chains, list) {
2981 if (__nf_tables_dump_rules(skb, &idx, cb, table, chain))
2985 if (ctx && ctx->table)
2995 static int nf_tables_dump_rules_start(struct netlink_callback *cb)
2997 const struct nlattr * const *nla = cb->data;
2998 struct nft_rule_dump_ctx *ctx = NULL;
3000 if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) {
3001 ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
3005 if (nla[NFTA_RULE_TABLE]) {
3006 ctx->table = nla_strdup(nla[NFTA_RULE_TABLE],
3013 if (nla[NFTA_RULE_CHAIN]) {
3014 ctx->chain = nla_strdup(nla[NFTA_RULE_CHAIN],
3028 static int nf_tables_dump_rules_done(struct netlink_callback *cb)
3030 struct nft_rule_dump_ctx *ctx = cb->data;
3040 /* called with rcu_read_lock held */
3041 static int nf_tables_getrule(struct net *net, struct sock *nlsk,
3042 struct sk_buff *skb, const struct nlmsghdr *nlh,
3043 const struct nlattr * const nla[],
3044 struct netlink_ext_ack *extack)
3046 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3047 u8 genmask = nft_genmask_cur(net);
3048 const struct nft_chain *chain;
3049 const struct nft_rule *rule;
3050 struct nft_table *table;
3051 struct sk_buff *skb2;
3052 int family = nfmsg->nfgen_family;
3055 if (nlh->nlmsg_flags & NLM_F_DUMP) {
3056 struct netlink_dump_control c = {
3057 .start= nf_tables_dump_rules_start,
3058 .dump = nf_tables_dump_rules,
3059 .done = nf_tables_dump_rules_done,
3060 .module = THIS_MODULE,
3061 .data = (void *)nla,
3064 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
3067 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask, 0);
3068 if (IS_ERR(table)) {
3069 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3070 return PTR_ERR(table);
3073 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask);
3074 if (IS_ERR(chain)) {
3075 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3076 return PTR_ERR(chain);
3079 rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
3081 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3082 return PTR_ERR(rule);
3085 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
3089 err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
3090 nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
3091 family, table, chain, rule, NULL);
3093 goto err_fill_rule_info;
3095 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
3102 static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
3103 struct nft_rule *rule)
3105 struct nft_expr *expr, *next;
3108 * Careful: some expressions might not be initialized in case this
3109 * is called on error from nf_tables_newrule().
3111 expr = nft_expr_first(rule);
3112 while (nft_expr_more(rule, expr)) {
3113 next = nft_expr_next(expr);
3114 nf_tables_expr_destroy(ctx, expr);
3120 void nf_tables_rule_release(const struct nft_ctx *ctx, struct nft_rule *rule)
3122 nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_RELEASE);
3123 nf_tables_rule_destroy(ctx, rule);
3126 int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain)
3128 struct nft_expr *expr, *last;
3129 const struct nft_data *data;
3130 struct nft_rule *rule;
3133 if (ctx->level == NFT_JUMP_STACK_SIZE)
3136 list_for_each_entry(rule, &chain->rules, list) {
3137 if (!nft_is_active_next(ctx->net, rule))
3140 nft_rule_for_each_expr(expr, last, rule) {
3141 if (!expr->ops->validate)
3144 err = expr->ops->validate(ctx, expr, &data);
3152 EXPORT_SYMBOL_GPL(nft_chain_validate);
3154 static int nft_table_validate(struct net *net, const struct nft_table *table)
3156 struct nft_chain *chain;
3157 struct nft_ctx ctx = {
3159 .family = table->family,
3163 list_for_each_entry(chain, &table->chains, list) {
3164 if (!nft_is_base_chain(chain))
3168 err = nft_chain_validate(&ctx, chain);
3176 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3177 const struct nlattr *nla);
3179 #define NFT_RULE_MAXEXPRS 128
3181 static int nf_tables_newrule(struct net *net, struct sock *nlsk,
3182 struct sk_buff *skb, const struct nlmsghdr *nlh,
3183 const struct nlattr * const nla[],
3184 struct netlink_ext_ack *extack)
3186 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3187 u8 genmask = nft_genmask_next(net);
3188 struct nft_expr_info *info = NULL;
3189 int family = nfmsg->nfgen_family;
3190 struct nft_flow_rule *flow;
3191 struct nft_table *table;
3192 struct nft_chain *chain;
3193 struct nft_rule *rule, *old_rule = NULL;
3194 struct nft_userdata *udata;
3195 struct nft_trans *trans = NULL;
3196 struct nft_expr *expr;
3199 unsigned int size, i, n, ulen = 0, usize = 0;
3201 u64 handle, pos_handle;
3203 lockdep_assert_held(&net->nft.commit_mutex);
3205 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
3206 NETLINK_CB(skb).portid);
3207 if (IS_ERR(table)) {
3208 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3209 return PTR_ERR(table);
3212 if (nla[NFTA_RULE_CHAIN]) {
3213 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3215 if (IS_ERR(chain)) {
3216 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3217 return PTR_ERR(chain);
3219 if (nft_chain_is_bound(chain))
3222 } else if (nla[NFTA_RULE_CHAIN_ID]) {
3223 chain = nft_chain_lookup_byid(net, nla[NFTA_RULE_CHAIN_ID]);
3224 if (IS_ERR(chain)) {
3225 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN_ID]);
3226 return PTR_ERR(chain);
3232 if (nla[NFTA_RULE_HANDLE]) {
3233 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
3234 rule = __nft_rule_lookup(chain, handle);
3236 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3237 return PTR_ERR(rule);
3240 if (nlh->nlmsg_flags & NLM_F_EXCL) {
3241 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3244 if (nlh->nlmsg_flags & NLM_F_REPLACE)
3249 if (!(nlh->nlmsg_flags & NLM_F_CREATE) ||
3250 nlh->nlmsg_flags & NLM_F_REPLACE)
3252 handle = nf_tables_alloc_handle(table);
3254 if (chain->use == UINT_MAX)
3257 if (nla[NFTA_RULE_POSITION]) {
3258 pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
3259 old_rule = __nft_rule_lookup(chain, pos_handle);
3260 if (IS_ERR(old_rule)) {
3261 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION]);
3262 return PTR_ERR(old_rule);
3264 } else if (nla[NFTA_RULE_POSITION_ID]) {
3265 old_rule = nft_rule_lookup_byid(net, nla[NFTA_RULE_POSITION_ID]);
3266 if (IS_ERR(old_rule)) {
3267 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION_ID]);
3268 return PTR_ERR(old_rule);
3273 nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
3277 if (nla[NFTA_RULE_EXPRESSIONS]) {
3278 info = kvmalloc_array(NFT_RULE_MAXEXPRS,
3279 sizeof(struct nft_expr_info),
3284 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
3286 if (nla_type(tmp) != NFTA_LIST_ELEM)
3288 if (n == NFT_RULE_MAXEXPRS)
3290 err = nf_tables_expr_parse(&ctx, tmp, &info[n]);
3293 size += info[n].ops->size;
3297 /* Check for overflow of dlen field */
3299 if (size >= 1 << 12)
3302 if (nla[NFTA_RULE_USERDATA]) {
3303 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
3305 usize = sizeof(struct nft_userdata) + ulen;
3309 rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL);
3313 nft_activate_next(net, rule);
3315 rule->handle = handle;
3317 rule->udata = ulen ? 1 : 0;
3320 udata = nft_userdata(rule);
3321 udata->len = ulen - 1;
3322 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
3325 expr = nft_expr_first(rule);
3326 for (i = 0; i < n; i++) {
3327 err = nf_tables_newexpr(&ctx, &info[i], expr);
3329 NL_SET_BAD_ATTR(extack, info[i].attr);
3333 if (info[i].ops->validate)
3334 nft_validate_state_update(net, NFT_VALIDATE_NEED);
3337 expr = nft_expr_next(expr);
3340 if (nlh->nlmsg_flags & NLM_F_REPLACE) {
3341 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
3342 if (trans == NULL) {
3346 err = nft_delrule(&ctx, old_rule);
3348 nft_trans_destroy(trans);
3352 list_add_tail_rcu(&rule->list, &old_rule->list);
3354 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
3360 if (nlh->nlmsg_flags & NLM_F_APPEND) {
3362 list_add_rcu(&rule->list, &old_rule->list);
3364 list_add_tail_rcu(&rule->list, &chain->rules);
3367 list_add_tail_rcu(&rule->list, &old_rule->list);
3369 list_add_rcu(&rule->list, &chain->rules);
3375 if (net->nft.validate_state == NFT_VALIDATE_DO)
3376 return nft_table_validate(net, table);
3378 if (chain->flags & NFT_CHAIN_HW_OFFLOAD) {
3379 flow = nft_flow_rule_create(net, rule);
3381 return PTR_ERR(flow);
3383 nft_trans_flow_rule(trans) = flow;
3388 nf_tables_rule_release(&ctx, rule);
3390 for (i = 0; i < n; i++) {
3392 module_put(info[i].ops->type->owner);
3393 if (info[i].ops->type->release_ops)
3394 info[i].ops->type->release_ops(info[i].ops);
3401 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3402 const struct nlattr *nla)
3404 u32 id = ntohl(nla_get_be32(nla));
3405 struct nft_trans *trans;
3407 list_for_each_entry(trans, &net->nft.commit_list, list) {
3408 struct nft_rule *rule = nft_trans_rule(trans);
3410 if (trans->msg_type == NFT_MSG_NEWRULE &&
3411 id == nft_trans_rule_id(trans))
3414 return ERR_PTR(-ENOENT);
3417 static int nf_tables_delrule(struct net *net, struct sock *nlsk,
3418 struct sk_buff *skb, const struct nlmsghdr *nlh,
3419 const struct nlattr * const nla[],
3420 struct netlink_ext_ack *extack)
3422 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3423 u8 genmask = nft_genmask_next(net);
3424 struct nft_table *table;
3425 struct nft_chain *chain = NULL;
3426 struct nft_rule *rule;
3427 int family = nfmsg->nfgen_family, err = 0;
3430 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
3431 NETLINK_CB(skb).portid);
3432 if (IS_ERR(table)) {
3433 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3434 return PTR_ERR(table);
3437 if (nla[NFTA_RULE_CHAIN]) {
3438 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3440 if (IS_ERR(chain)) {
3441 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3442 return PTR_ERR(chain);
3444 if (nft_chain_is_bound(chain))
3448 nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
3451 if (nla[NFTA_RULE_HANDLE]) {
3452 rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
3454 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3455 return PTR_ERR(rule);
3458 err = nft_delrule(&ctx, rule);
3459 } else if (nla[NFTA_RULE_ID]) {
3460 rule = nft_rule_lookup_byid(net, nla[NFTA_RULE_ID]);
3462 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_ID]);
3463 return PTR_ERR(rule);
3466 err = nft_delrule(&ctx, rule);
3468 err = nft_delrule_by_chain(&ctx);
3471 list_for_each_entry(chain, &table->chains, list) {
3472 if (!nft_is_active_next(net, chain))
3476 err = nft_delrule_by_chain(&ctx);
3488 static const struct nft_set_type *nft_set_types[] = {
3489 &nft_set_hash_fast_type,
3491 &nft_set_rhash_type,
3492 &nft_set_bitmap_type,
3493 &nft_set_rbtree_type,
3494 #if defined(CONFIG_X86_64) && !defined(CONFIG_UML)
3495 &nft_set_pipapo_avx2_type,
3497 &nft_set_pipapo_type,
3500 #define NFT_SET_FEATURES (NFT_SET_INTERVAL | NFT_SET_MAP | \
3501 NFT_SET_TIMEOUT | NFT_SET_OBJECT | \
3504 static bool nft_set_ops_candidate(const struct nft_set_type *type, u32 flags)
3506 return (flags & type->features) == (flags & NFT_SET_FEATURES);
3510 * Select a set implementation based on the data characteristics and the
3511 * given policy. The total memory use might not be known if no size is
3512 * given, in that case the amount of memory per element is used.
3514 static const struct nft_set_ops *
3515 nft_select_set_ops(const struct nft_ctx *ctx,
3516 const struct nlattr * const nla[],
3517 const struct nft_set_desc *desc,
3518 enum nft_set_policies policy)
3520 const struct nft_set_ops *ops, *bops;
3521 struct nft_set_estimate est, best;
3522 const struct nft_set_type *type;
3526 lockdep_assert_held(&ctx->net->nft.commit_mutex);
3527 lockdep_nfnl_nft_mutex_not_held();
3529 if (nla[NFTA_SET_FLAGS] != NULL)
3530 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
3537 for (i = 0; i < ARRAY_SIZE(nft_set_types); i++) {
3538 type = nft_set_types[i];
3541 if (!nft_set_ops_candidate(type, flags))
3543 if (!ops->estimate(desc, flags, &est))
3547 case NFT_SET_POL_PERFORMANCE:
3548 if (est.lookup < best.lookup)
3550 if (est.lookup == best.lookup &&
3551 est.space < best.space)
3554 case NFT_SET_POL_MEMORY:
3556 if (est.space < best.space)
3558 if (est.space == best.space &&
3559 est.lookup < best.lookup)
3561 } else if (est.size < best.size || !bops) {
3576 return ERR_PTR(-EOPNOTSUPP);
3579 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
3580 [NFTA_SET_TABLE] = { .type = NLA_STRING,
3581 .len = NFT_TABLE_MAXNAMELEN - 1 },
3582 [NFTA_SET_NAME] = { .type = NLA_STRING,
3583 .len = NFT_SET_MAXNAMELEN - 1 },
3584 [NFTA_SET_FLAGS] = { .type = NLA_U32 },
3585 [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 },
3586 [NFTA_SET_KEY_LEN] = { .type = NLA_U32 },
3587 [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 },
3588 [NFTA_SET_DATA_LEN] = { .type = NLA_U32 },
3589 [NFTA_SET_POLICY] = { .type = NLA_U32 },
3590 [NFTA_SET_DESC] = { .type = NLA_NESTED },
3591 [NFTA_SET_ID] = { .type = NLA_U32 },
3592 [NFTA_SET_TIMEOUT] = { .type = NLA_U64 },
3593 [NFTA_SET_GC_INTERVAL] = { .type = NLA_U32 },
3594 [NFTA_SET_USERDATA] = { .type = NLA_BINARY,
3595 .len = NFT_USERDATA_MAXLEN },
3596 [NFTA_SET_OBJ_TYPE] = { .type = NLA_U32 },
3597 [NFTA_SET_HANDLE] = { .type = NLA_U64 },
3598 [NFTA_SET_EXPR] = { .type = NLA_NESTED },
3599 [NFTA_SET_EXPRESSIONS] = { .type = NLA_NESTED },
3602 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
3603 [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 },
3604 [NFTA_SET_DESC_CONCAT] = { .type = NLA_NESTED },
3607 static int nft_ctx_init_from_setattr(struct nft_ctx *ctx, struct net *net,
3608 const struct sk_buff *skb,
3609 const struct nlmsghdr *nlh,
3610 const struct nlattr * const nla[],
3611 struct netlink_ext_ack *extack,
3612 u8 genmask, u32 nlpid)
3614 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3615 int family = nfmsg->nfgen_family;
3616 struct nft_table *table = NULL;
3618 if (nla[NFTA_SET_TABLE] != NULL) {
3619 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
3621 if (IS_ERR(table)) {
3622 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
3623 return PTR_ERR(table);
3627 nft_ctx_init(ctx, net, skb, nlh, family, table, NULL, nla);
3631 static struct nft_set *nft_set_lookup(const struct nft_table *table,
3632 const struct nlattr *nla, u8 genmask)
3634 struct nft_set *set;
3637 return ERR_PTR(-EINVAL);
3639 list_for_each_entry_rcu(set, &table->sets, list) {
3640 if (!nla_strcmp(nla, set->name) &&
3641 nft_active_genmask(set, genmask))
3644 return ERR_PTR(-ENOENT);
3647 static struct nft_set *nft_set_lookup_byhandle(const struct nft_table *table,
3648 const struct nlattr *nla,
3651 struct nft_set *set;
3653 list_for_each_entry(set, &table->sets, list) {
3654 if (be64_to_cpu(nla_get_be64(nla)) == set->handle &&
3655 nft_active_genmask(set, genmask))
3658 return ERR_PTR(-ENOENT);
3661 static struct nft_set *nft_set_lookup_byid(const struct net *net,
3662 const struct nlattr *nla, u8 genmask)
3664 struct nft_trans *trans;
3665 u32 id = ntohl(nla_get_be32(nla));
3667 list_for_each_entry(trans, &net->nft.commit_list, list) {
3668 if (trans->msg_type == NFT_MSG_NEWSET) {
3669 struct nft_set *set = nft_trans_set(trans);
3671 if (id == nft_trans_set_id(trans) &&
3672 nft_active_genmask(set, genmask))
3676 return ERR_PTR(-ENOENT);
3679 struct nft_set *nft_set_lookup_global(const struct net *net,
3680 const struct nft_table *table,
3681 const struct nlattr *nla_set_name,
3682 const struct nlattr *nla_set_id,
3685 struct nft_set *set;
3687 set = nft_set_lookup(table, nla_set_name, genmask);
3692 set = nft_set_lookup_byid(net, nla_set_id, genmask);
3696 EXPORT_SYMBOL_GPL(nft_set_lookup_global);
3698 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
3701 const struct nft_set *i;
3703 unsigned long *inuse;
3704 unsigned int n = 0, min = 0;
3706 p = strchr(name, '%');
3708 if (p[1] != 'd' || strchr(p + 2, '%'))
3711 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
3715 list_for_each_entry(i, &ctx->table->sets, list) {
3718 if (!nft_is_active_next(ctx->net, set))
3720 if (!sscanf(i->name, name, &tmp))
3722 if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
3725 set_bit(tmp - min, inuse);
3728 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
3729 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
3730 min += BITS_PER_BYTE * PAGE_SIZE;
3731 memset(inuse, 0, PAGE_SIZE);
3734 free_page((unsigned long)inuse);
3737 set->name = kasprintf(GFP_KERNEL, name, min + n);
3741 list_for_each_entry(i, &ctx->table->sets, list) {
3742 if (!nft_is_active_next(ctx->net, i))
3744 if (!strcmp(set->name, i->name)) {
3753 int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result)
3755 u64 ms = be64_to_cpu(nla_get_be64(nla));
3756 u64 max = (u64)(~((u64)0));
3758 max = div_u64(max, NSEC_PER_MSEC);
3762 ms *= NSEC_PER_MSEC;
3763 *result = nsecs_to_jiffies64(ms);
3767 __be64 nf_jiffies64_to_msecs(u64 input)
3769 return cpu_to_be64(jiffies64_to_msecs(input));
3772 static int nf_tables_fill_set_concat(struct sk_buff *skb,
3773 const struct nft_set *set)
3775 struct nlattr *concat, *field;
3778 concat = nla_nest_start_noflag(skb, NFTA_SET_DESC_CONCAT);
3782 for (i = 0; i < set->field_count; i++) {
3783 field = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
3787 if (nla_put_be32(skb, NFTA_SET_FIELD_LEN,
3788 htonl(set->field_len[i])))
3791 nla_nest_end(skb, field);
3794 nla_nest_end(skb, concat);
3799 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
3800 const struct nft_set *set, u16 event, u16 flags)
3802 struct nfgenmsg *nfmsg;
3803 struct nlmsghdr *nlh;
3804 u32 portid = ctx->portid;
3805 struct nlattr *nest;
3809 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
3810 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3813 goto nla_put_failure;
3815 nfmsg = nlmsg_data(nlh);
3816 nfmsg->nfgen_family = ctx->family;
3817 nfmsg->version = NFNETLINK_V0;
3818 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
3820 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
3821 goto nla_put_failure;
3822 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
3823 goto nla_put_failure;
3824 if (nla_put_be64(skb, NFTA_SET_HANDLE, cpu_to_be64(set->handle),
3826 goto nla_put_failure;
3827 if (set->flags != 0)
3828 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
3829 goto nla_put_failure;
3831 if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
3832 goto nla_put_failure;
3833 if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
3834 goto nla_put_failure;
3835 if (set->flags & NFT_SET_MAP) {
3836 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
3837 goto nla_put_failure;
3838 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
3839 goto nla_put_failure;
3841 if (set->flags & NFT_SET_OBJECT &&
3842 nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
3843 goto nla_put_failure;
3846 nla_put_be64(skb, NFTA_SET_TIMEOUT,
3847 nf_jiffies64_to_msecs(set->timeout),
3849 goto nla_put_failure;
3851 nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(set->gc_int)))
3852 goto nla_put_failure;
3854 if (set->policy != NFT_SET_POL_PERFORMANCE) {
3855 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
3856 goto nla_put_failure;
3860 nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
3861 goto nla_put_failure;
3863 nest = nla_nest_start_noflag(skb, NFTA_SET_DESC);
3865 goto nla_put_failure;
3867 nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
3868 goto nla_put_failure;
3870 if (set->field_count > 1 &&
3871 nf_tables_fill_set_concat(skb, set))
3872 goto nla_put_failure;
3874 nla_nest_end(skb, nest);
3876 if (set->num_exprs == 1) {
3877 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPR);
3878 if (nf_tables_fill_expr_info(skb, set->exprs[0]) < 0)
3879 goto nla_put_failure;
3881 nla_nest_end(skb, nest);
3882 } else if (set->num_exprs > 1) {
3883 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPRESSIONS);
3885 goto nla_put_failure;
3887 for (i = 0; i < set->num_exprs; i++) {
3888 if (nft_expr_dump(skb, NFTA_LIST_ELEM,
3890 goto nla_put_failure;
3892 nla_nest_end(skb, nest);
3895 nlmsg_end(skb, nlh);
3899 nlmsg_trim(skb, nlh);
3903 static void nf_tables_set_notify(const struct nft_ctx *ctx,
3904 const struct nft_set *set, int event,
3907 struct sk_buff *skb;
3908 u32 portid = ctx->portid;
3910 char *buf = kasprintf(gfp_flags, "%s:%llu;%s:%llu",
3911 ctx->table->name, ctx->table->handle,
3912 set->name, set->handle);
3914 audit_log_nfcfg(buf,
3917 event == NFT_MSG_NEWSET ?
3918 AUDIT_NFT_OP_SET_REGISTER :
3919 AUDIT_NFT_OP_SET_UNREGISTER,
3924 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
3927 skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
3931 err = nf_tables_fill_set(skb, ctx, set, event, 0);
3937 nft_notify_enqueue(skb, ctx->report, &ctx->net->nft.notify_list);
3940 nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
3943 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
3945 const struct nft_set *set;
3946 unsigned int idx, s_idx = cb->args[0];
3947 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
3948 struct net *net = sock_net(skb->sk);
3949 struct nft_ctx *ctx = cb->data, ctx_set;
3955 cb->seq = net->nft.base_seq;
3957 list_for_each_entry_rcu(table, &net->nft.tables, list) {
3958 if (ctx->family != NFPROTO_UNSPEC &&
3959 ctx->family != table->family)
3962 if (ctx->table && ctx->table != table)
3966 if (cur_table != table)
3972 list_for_each_entry_rcu(set, &table->sets, list) {
3975 if (!nft_is_active(net, set))
3979 ctx_set.table = table;
3980 ctx_set.family = table->family;
3982 if (nf_tables_fill_set(skb, &ctx_set, set,
3986 cb->args[2] = (unsigned long) table;
3989 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4002 static int nf_tables_dump_sets_start(struct netlink_callback *cb)
4004 struct nft_ctx *ctx_dump = NULL;
4006 ctx_dump = kmemdup(cb->data, sizeof(*ctx_dump), GFP_ATOMIC);
4007 if (ctx_dump == NULL)
4010 cb->data = ctx_dump;
4014 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
4020 /* called with rcu_read_lock held */
4021 static int nf_tables_getset(struct net *net, struct sock *nlsk,
4022 struct sk_buff *skb, const struct nlmsghdr *nlh,
4023 const struct nlattr * const nla[],
4024 struct netlink_ext_ack *extack)
4026 u8 genmask = nft_genmask_cur(net);
4027 const struct nft_set *set;
4029 struct sk_buff *skb2;
4030 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4033 /* Verify existence before starting dump */
4034 err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, extack,
4039 if (nlh->nlmsg_flags & NLM_F_DUMP) {
4040 struct netlink_dump_control c = {
4041 .start = nf_tables_dump_sets_start,
4042 .dump = nf_tables_dump_sets,
4043 .done = nf_tables_dump_sets_done,
4045 .module = THIS_MODULE,
4048 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
4051 /* Only accept unspec with dump */
4052 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
4053 return -EAFNOSUPPORT;
4054 if (!nla[NFTA_SET_TABLE])
4057 set = nft_set_lookup(ctx.table, nla[NFTA_SET_NAME], genmask);
4059 return PTR_ERR(set);
4061 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
4065 err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
4067 goto err_fill_set_info;
4069 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
4076 static const struct nla_policy nft_concat_policy[NFTA_SET_FIELD_MAX + 1] = {
4077 [NFTA_SET_FIELD_LEN] = { .type = NLA_U32 },
4080 static int nft_set_desc_concat_parse(const struct nlattr *attr,
4081 struct nft_set_desc *desc)
4083 struct nlattr *tb[NFTA_SET_FIELD_MAX + 1];
4087 err = nla_parse_nested_deprecated(tb, NFTA_SET_FIELD_MAX, attr,
4088 nft_concat_policy, NULL);
4092 if (!tb[NFTA_SET_FIELD_LEN])
4095 len = ntohl(nla_get_be32(tb[NFTA_SET_FIELD_LEN]));
4097 if (len * BITS_PER_BYTE / 32 > NFT_REG32_COUNT)
4100 desc->field_len[desc->field_count++] = len;
4105 static int nft_set_desc_concat(struct nft_set_desc *desc,
4106 const struct nlattr *nla)
4108 struct nlattr *attr;
4111 nla_for_each_nested(attr, nla, rem) {
4112 if (nla_type(attr) != NFTA_LIST_ELEM)
4115 err = nft_set_desc_concat_parse(attr, desc);
4123 static int nf_tables_set_desc_parse(struct nft_set_desc *desc,
4124 const struct nlattr *nla)
4126 struct nlattr *da[NFTA_SET_DESC_MAX + 1];
4129 err = nla_parse_nested_deprecated(da, NFTA_SET_DESC_MAX, nla,
4130 nft_set_desc_policy, NULL);
4134 if (da[NFTA_SET_DESC_SIZE] != NULL)
4135 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
4136 if (da[NFTA_SET_DESC_CONCAT])
4137 err = nft_set_desc_concat(desc, da[NFTA_SET_DESC_CONCAT]);
4142 static int nf_tables_newset(struct net *net, struct sock *nlsk,
4143 struct sk_buff *skb, const struct nlmsghdr *nlh,
4144 const struct nlattr * const nla[],
4145 struct netlink_ext_ack *extack)
4147 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4148 u8 genmask = nft_genmask_next(net);
4149 int family = nfmsg->nfgen_family;
4150 const struct nft_set_ops *ops;
4151 struct nft_expr *expr = NULL;
4152 struct nft_table *table;
4153 struct nft_set *set;
4158 u32 ktype, dtype, flags, policy, gc_int, objtype;
4159 struct nft_set_desc desc;
4160 unsigned char *udata;
4165 if (nla[NFTA_SET_TABLE] == NULL ||
4166 nla[NFTA_SET_NAME] == NULL ||
4167 nla[NFTA_SET_KEY_LEN] == NULL ||
4168 nla[NFTA_SET_ID] == NULL)
4171 memset(&desc, 0, sizeof(desc));
4173 ktype = NFT_DATA_VALUE;
4174 if (nla[NFTA_SET_KEY_TYPE] != NULL) {
4175 ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
4176 if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
4180 desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
4181 if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
4185 if (nla[NFTA_SET_FLAGS] != NULL) {
4186 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
4187 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
4188 NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
4189 NFT_SET_MAP | NFT_SET_EVAL |
4190 NFT_SET_OBJECT | NFT_SET_CONCAT | NFT_SET_EXPR))
4192 /* Only one of these operations is supported */
4193 if ((flags & (NFT_SET_MAP | NFT_SET_OBJECT)) ==
4194 (NFT_SET_MAP | NFT_SET_OBJECT))
4196 if ((flags & (NFT_SET_EVAL | NFT_SET_OBJECT)) ==
4197 (NFT_SET_EVAL | NFT_SET_OBJECT))
4202 if (nla[NFTA_SET_DATA_TYPE] != NULL) {
4203 if (!(flags & NFT_SET_MAP))
4206 dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
4207 if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
4208 dtype != NFT_DATA_VERDICT)
4211 if (dtype != NFT_DATA_VERDICT) {
4212 if (nla[NFTA_SET_DATA_LEN] == NULL)
4214 desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
4215 if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
4218 desc.dlen = sizeof(struct nft_verdict);
4219 } else if (flags & NFT_SET_MAP)
4222 if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
4223 if (!(flags & NFT_SET_OBJECT))
4226 objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
4227 if (objtype == NFT_OBJECT_UNSPEC ||
4228 objtype > NFT_OBJECT_MAX)
4230 } else if (flags & NFT_SET_OBJECT)
4233 objtype = NFT_OBJECT_UNSPEC;
4236 if (nla[NFTA_SET_TIMEOUT] != NULL) {
4237 if (!(flags & NFT_SET_TIMEOUT))
4240 err = nf_msecs_to_jiffies64(nla[NFTA_SET_TIMEOUT], &timeout);
4245 if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
4246 if (!(flags & NFT_SET_TIMEOUT))
4248 gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
4251 policy = NFT_SET_POL_PERFORMANCE;
4252 if (nla[NFTA_SET_POLICY] != NULL)
4253 policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
4255 if (nla[NFTA_SET_DESC] != NULL) {
4256 err = nf_tables_set_desc_parse(&desc, nla[NFTA_SET_DESC]);
4261 if (nla[NFTA_SET_EXPR] || nla[NFTA_SET_EXPRESSIONS])
4264 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, genmask,
4265 NETLINK_CB(skb).portid);
4266 if (IS_ERR(table)) {
4267 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4268 return PTR_ERR(table);
4271 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
4273 set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
4275 if (PTR_ERR(set) != -ENOENT) {
4276 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4277 return PTR_ERR(set);
4280 if (nlh->nlmsg_flags & NLM_F_EXCL) {
4281 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4284 if (nlh->nlmsg_flags & NLM_F_REPLACE)
4290 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
4293 ops = nft_select_set_ops(&ctx, nla, &desc, policy);
4295 return PTR_ERR(ops);
4298 if (nla[NFTA_SET_USERDATA])
4299 udlen = nla_len(nla[NFTA_SET_USERDATA]);
4302 if (ops->privsize != NULL)
4303 size = ops->privsize(nla, &desc);
4305 set = kvzalloc(sizeof(*set) + size + udlen, GFP_KERNEL);
4309 name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL);
4315 err = nf_tables_set_alloc_name(&ctx, set, name);
4318 goto err_set_alloc_name;
4320 if (nla[NFTA_SET_EXPR]) {
4321 expr = nft_set_elem_expr_alloc(&ctx, set, nla[NFTA_SET_EXPR]);
4323 err = PTR_ERR(expr);
4324 goto err_set_alloc_name;
4326 set->exprs[0] = expr;
4328 } else if (nla[NFTA_SET_EXPRESSIONS]) {
4329 struct nft_expr *expr;
4333 if (!(flags & NFT_SET_EXPR)) {
4335 goto err_set_alloc_name;
4338 nla_for_each_nested(tmp, nla[NFTA_SET_EXPRESSIONS], left) {
4339 if (i == NFT_SET_EXPR_MAX) {
4343 if (nla_type(tmp) != NFTA_LIST_ELEM) {
4347 expr = nft_set_elem_expr_alloc(&ctx, set, tmp);
4349 err = PTR_ERR(expr);
4352 set->exprs[i++] = expr;
4359 udata = set->data + size;
4360 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
4363 INIT_LIST_HEAD(&set->bindings);
4365 write_pnet(&set->net, net);
4368 set->klen = desc.klen;
4370 set->objtype = objtype;
4371 set->dlen = desc.dlen;
4373 set->size = desc.size;
4374 set->policy = policy;
4377 set->timeout = timeout;
4378 set->gc_int = gc_int;
4379 set->handle = nf_tables_alloc_handle(table);
4381 set->field_count = desc.field_count;
4382 for (i = 0; i < desc.field_count; i++)
4383 set->field_len[i] = desc.field_len[i];
4385 err = ops->init(set, &desc, nla);
4389 err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
4393 list_add_tail_rcu(&set->list, &table->sets);
4400 for (i = 0; i < set->num_exprs; i++)
4401 nft_expr_destroy(&ctx, set->exprs[i]);
4409 static void nft_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
4413 if (WARN_ON(set->use > 0))
4416 for (i = 0; i < set->num_exprs; i++)
4417 nft_expr_destroy(ctx, set->exprs[i]);
4419 set->ops->destroy(set);
4424 static int nf_tables_delset(struct net *net, struct sock *nlsk,
4425 struct sk_buff *skb, const struct nlmsghdr *nlh,
4426 const struct nlattr * const nla[],
4427 struct netlink_ext_ack *extack)
4429 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4430 u8 genmask = nft_genmask_next(net);
4431 const struct nlattr *attr;
4432 struct nft_set *set;
4436 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
4437 return -EAFNOSUPPORT;
4438 if (nla[NFTA_SET_TABLE] == NULL)
4441 err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, extack,
4442 genmask, NETLINK_CB(skb).portid);
4446 if (nla[NFTA_SET_HANDLE]) {
4447 attr = nla[NFTA_SET_HANDLE];
4448 set = nft_set_lookup_byhandle(ctx.table, attr, genmask);
4450 attr = nla[NFTA_SET_NAME];
4451 set = nft_set_lookup(ctx.table, attr, genmask);
4455 NL_SET_BAD_ATTR(extack, attr);
4456 return PTR_ERR(set);
4459 (nlh->nlmsg_flags & NLM_F_NONREC && atomic_read(&set->nelems) > 0)) {
4460 NL_SET_BAD_ATTR(extack, attr);
4464 return nft_delset(&ctx, set);
4467 static int nft_validate_register_store(const struct nft_ctx *ctx,
4468 enum nft_registers reg,
4469 const struct nft_data *data,
4470 enum nft_data_types type,
4473 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
4474 struct nft_set *set,
4475 const struct nft_set_iter *iter,
4476 struct nft_set_elem *elem)
4478 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4479 enum nft_registers dreg;
4481 dreg = nft_type_to_reg(set->dtype);
4482 return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
4483 set->dtype == NFT_DATA_VERDICT ?
4484 NFT_DATA_VERDICT : NFT_DATA_VALUE,
4488 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
4489 struct nft_set_binding *binding)
4491 struct nft_set_binding *i;
4492 struct nft_set_iter iter;
4494 if (set->use == UINT_MAX)
4497 if (!list_empty(&set->bindings) && nft_set_is_anonymous(set))
4500 if (binding->flags & NFT_SET_MAP) {
4501 /* If the set is already bound to the same chain all
4502 * jumps are already validated for that chain.
4504 list_for_each_entry(i, &set->bindings, list) {
4505 if (i->flags & NFT_SET_MAP &&
4506 i->chain == binding->chain)
4510 iter.genmask = nft_genmask_next(ctx->net);
4514 iter.fn = nf_tables_bind_check_setelem;
4516 set->ops->walk(ctx, set, &iter);
4521 binding->chain = ctx->chain;
4522 list_add_tail_rcu(&binding->list, &set->bindings);
4523 nft_set_trans_bind(ctx, set);
4528 EXPORT_SYMBOL_GPL(nf_tables_bind_set);
4530 static void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
4531 struct nft_set_binding *binding, bool event)
4533 list_del_rcu(&binding->list);
4535 if (list_empty(&set->bindings) && nft_set_is_anonymous(set)) {
4536 list_del_rcu(&set->list);
4538 nf_tables_set_notify(ctx, set, NFT_MSG_DELSET,
4543 void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set,
4544 struct nft_set_binding *binding,
4545 enum nft_trans_phase phase)
4548 case NFT_TRANS_PREPARE:
4551 case NFT_TRANS_ABORT:
4552 case NFT_TRANS_RELEASE:
4556 nf_tables_unbind_set(ctx, set, binding,
4557 phase == NFT_TRANS_COMMIT);
4560 EXPORT_SYMBOL_GPL(nf_tables_deactivate_set);
4562 void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set)
4564 if (list_empty(&set->bindings) && nft_set_is_anonymous(set))
4565 nft_set_destroy(ctx, set);
4567 EXPORT_SYMBOL_GPL(nf_tables_destroy_set);
4569 const struct nft_set_ext_type nft_set_ext_types[] = {
4570 [NFT_SET_EXT_KEY] = {
4571 .align = __alignof__(u32),
4573 [NFT_SET_EXT_DATA] = {
4574 .align = __alignof__(u32),
4576 [NFT_SET_EXT_EXPRESSIONS] = {
4577 .align = __alignof__(struct nft_set_elem_expr),
4579 [NFT_SET_EXT_OBJREF] = {
4580 .len = sizeof(struct nft_object *),
4581 .align = __alignof__(struct nft_object *),
4583 [NFT_SET_EXT_FLAGS] = {
4585 .align = __alignof__(u8),
4587 [NFT_SET_EXT_TIMEOUT] = {
4589 .align = __alignof__(u64),
4591 [NFT_SET_EXT_EXPIRATION] = {
4593 .align = __alignof__(u64),
4595 [NFT_SET_EXT_USERDATA] = {
4596 .len = sizeof(struct nft_userdata),
4597 .align = __alignof__(struct nft_userdata),
4599 [NFT_SET_EXT_KEY_END] = {
4600 .align = __alignof__(u32),
4608 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
4609 [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED },
4610 [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED },
4611 [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 },
4612 [NFTA_SET_ELEM_TIMEOUT] = { .type = NLA_U64 },
4613 [NFTA_SET_ELEM_EXPIRATION] = { .type = NLA_U64 },
4614 [NFTA_SET_ELEM_USERDATA] = { .type = NLA_BINARY,
4615 .len = NFT_USERDATA_MAXLEN },
4616 [NFTA_SET_ELEM_EXPR] = { .type = NLA_NESTED },
4617 [NFTA_SET_ELEM_OBJREF] = { .type = NLA_STRING,
4618 .len = NFT_OBJ_MAXNAMELEN - 1 },
4619 [NFTA_SET_ELEM_KEY_END] = { .type = NLA_NESTED },
4620 [NFTA_SET_ELEM_EXPRESSIONS] = { .type = NLA_NESTED },
4623 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
4624 [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING,
4625 .len = NFT_TABLE_MAXNAMELEN - 1 },
4626 [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING,
4627 .len = NFT_SET_MAXNAMELEN - 1 },
4628 [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED },
4629 [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 },
4632 static int nft_ctx_init_from_elemattr(struct nft_ctx *ctx, struct net *net,
4633 const struct sk_buff *skb,
4634 const struct nlmsghdr *nlh,
4635 const struct nlattr * const nla[],
4636 struct netlink_ext_ack *extack,
4637 u8 genmask, u32 nlpid)
4639 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4640 int family = nfmsg->nfgen_family;
4641 struct nft_table *table;
4643 table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
4645 if (IS_ERR(table)) {
4646 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
4647 return PTR_ERR(table);
4650 nft_ctx_init(ctx, net, skb, nlh, family, table, NULL, nla);
4654 static int nft_set_elem_expr_dump(struct sk_buff *skb,
4655 const struct nft_set *set,
4656 const struct nft_set_ext *ext)
4658 struct nft_set_elem_expr *elem_expr;
4659 u32 size, num_exprs = 0;
4660 struct nft_expr *expr;
4661 struct nlattr *nest;
4663 elem_expr = nft_set_ext_expr(ext);
4664 nft_setelem_expr_foreach(expr, elem_expr, size)
4667 if (num_exprs == 1) {
4668 expr = nft_setelem_expr_at(elem_expr, 0);
4669 if (nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, expr) < 0)
4673 } else if (num_exprs > 1) {
4674 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_EXPRESSIONS);
4676 goto nla_put_failure;
4678 nft_setelem_expr_foreach(expr, elem_expr, size) {
4679 expr = nft_setelem_expr_at(elem_expr, size);
4680 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
4681 goto nla_put_failure;
4683 nla_nest_end(skb, nest);
4691 static int nf_tables_fill_setelem(struct sk_buff *skb,
4692 const struct nft_set *set,
4693 const struct nft_set_elem *elem)
4695 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4696 unsigned char *b = skb_tail_pointer(skb);
4697 struct nlattr *nest;
4699 nest = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
4701 goto nla_put_failure;
4703 if (nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
4704 NFT_DATA_VALUE, set->klen) < 0)
4705 goto nla_put_failure;
4707 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
4708 nft_data_dump(skb, NFTA_SET_ELEM_KEY_END, nft_set_ext_key_end(ext),
4709 NFT_DATA_VALUE, set->klen) < 0)
4710 goto nla_put_failure;
4712 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
4713 nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
4714 set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
4716 goto nla_put_failure;
4718 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS) &&
4719 nft_set_elem_expr_dump(skb, set, ext))
4720 goto nla_put_failure;
4722 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
4723 nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
4724 (*nft_set_ext_obj(ext))->key.name) < 0)
4725 goto nla_put_failure;
4727 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
4728 nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
4729 htonl(*nft_set_ext_flags(ext))))
4730 goto nla_put_failure;
4732 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
4733 nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
4734 nf_jiffies64_to_msecs(*nft_set_ext_timeout(ext)),
4736 goto nla_put_failure;
4738 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
4739 u64 expires, now = get_jiffies_64();
4741 expires = *nft_set_ext_expiration(ext);
4742 if (time_before64(now, expires))
4747 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
4748 nf_jiffies64_to_msecs(expires),
4750 goto nla_put_failure;
4753 if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
4754 struct nft_userdata *udata;
4756 udata = nft_set_ext_userdata(ext);
4757 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
4758 udata->len + 1, udata->data))
4759 goto nla_put_failure;
4762 nla_nest_end(skb, nest);
4770 struct nft_set_dump_args {
4771 const struct netlink_callback *cb;
4772 struct nft_set_iter iter;
4773 struct sk_buff *skb;
4776 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
4777 struct nft_set *set,
4778 const struct nft_set_iter *iter,
4779 struct nft_set_elem *elem)
4781 struct nft_set_dump_args *args;
4783 args = container_of(iter, struct nft_set_dump_args, iter);
4784 return nf_tables_fill_setelem(args->skb, set, elem);
4787 struct nft_set_dump_ctx {
4788 const struct nft_set *set;
4792 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
4794 struct nft_set_dump_ctx *dump_ctx = cb->data;
4795 struct net *net = sock_net(skb->sk);
4796 struct nft_table *table;
4797 struct nft_set *set;
4798 struct nft_set_dump_args args;
4799 bool set_found = false;
4800 struct nfgenmsg *nfmsg;
4801 struct nlmsghdr *nlh;
4802 struct nlattr *nest;
4807 list_for_each_entry_rcu(table, &net->nft.tables, list) {
4808 if (dump_ctx->ctx.family != NFPROTO_UNSPEC &&
4809 dump_ctx->ctx.family != table->family)
4812 if (table != dump_ctx->ctx.table)
4815 list_for_each_entry_rcu(set, &table->sets, list) {
4816 if (set == dump_ctx->set) {
4829 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM);
4830 portid = NETLINK_CB(cb->skb).portid;
4831 seq = cb->nlh->nlmsg_seq;
4833 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
4836 goto nla_put_failure;
4838 nfmsg = nlmsg_data(nlh);
4839 nfmsg->nfgen_family = table->family;
4840 nfmsg->version = NFNETLINK_V0;
4841 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
4843 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name))
4844 goto nla_put_failure;
4845 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
4846 goto nla_put_failure;
4848 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
4850 goto nla_put_failure;
4854 args.iter.genmask = nft_genmask_cur(net);
4855 args.iter.skip = cb->args[0];
4856 args.iter.count = 0;
4858 args.iter.fn = nf_tables_dump_setelem;
4859 set->ops->walk(&dump_ctx->ctx, set, &args.iter);
4862 nla_nest_end(skb, nest);
4863 nlmsg_end(skb, nlh);
4865 if (args.iter.err && args.iter.err != -EMSGSIZE)
4866 return args.iter.err;
4867 if (args.iter.count == cb->args[0])
4870 cb->args[0] = args.iter.count;
4878 static int nf_tables_dump_set_start(struct netlink_callback *cb)
4880 struct nft_set_dump_ctx *dump_ctx = cb->data;
4882 cb->data = kmemdup(dump_ctx, sizeof(*dump_ctx), GFP_ATOMIC);
4884 return cb->data ? 0 : -ENOMEM;
4887 static int nf_tables_dump_set_done(struct netlink_callback *cb)
4893 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
4894 const struct nft_ctx *ctx, u32 seq,
4895 u32 portid, int event, u16 flags,
4896 const struct nft_set *set,
4897 const struct nft_set_elem *elem)
4899 struct nfgenmsg *nfmsg;
4900 struct nlmsghdr *nlh;
4901 struct nlattr *nest;
4904 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
4905 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
4908 goto nla_put_failure;
4910 nfmsg = nlmsg_data(nlh);
4911 nfmsg->nfgen_family = ctx->family;
4912 nfmsg->version = NFNETLINK_V0;
4913 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
4915 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
4916 goto nla_put_failure;
4917 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
4918 goto nla_put_failure;
4920 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
4922 goto nla_put_failure;
4924 err = nf_tables_fill_setelem(skb, set, elem);
4926 goto nla_put_failure;
4928 nla_nest_end(skb, nest);
4930 nlmsg_end(skb, nlh);
4934 nlmsg_trim(skb, nlh);
4938 static int nft_setelem_parse_flags(const struct nft_set *set,
4939 const struct nlattr *attr, u32 *flags)
4944 *flags = ntohl(nla_get_be32(attr));
4945 if (*flags & ~NFT_SET_ELEM_INTERVAL_END)
4947 if (!(set->flags & NFT_SET_INTERVAL) &&
4948 *flags & NFT_SET_ELEM_INTERVAL_END)
4954 static int nft_setelem_parse_key(struct nft_ctx *ctx, struct nft_set *set,
4955 struct nft_data *key, struct nlattr *attr)
4957 struct nft_data_desc desc;
4960 err = nft_data_init(ctx, key, NFT_DATA_VALUE_MAXLEN, &desc, attr);
4964 if (desc.type != NFT_DATA_VALUE || desc.len != set->klen) {
4965 nft_data_release(key, desc.type);
4972 static int nft_setelem_parse_data(struct nft_ctx *ctx, struct nft_set *set,
4973 struct nft_data_desc *desc,
4974 struct nft_data *data,
4975 struct nlattr *attr)
4979 err = nft_data_init(ctx, data, NFT_DATA_VALUE_MAXLEN, desc, attr);
4983 if (desc->type != NFT_DATA_VERDICT && desc->len != set->dlen) {
4984 nft_data_release(data, desc->type);
4991 static int nft_get_set_elem(struct nft_ctx *ctx, struct nft_set *set,
4992 const struct nlattr *attr)
4994 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
4995 struct nft_set_elem elem;
4996 struct sk_buff *skb;
5001 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
5002 nft_set_elem_policy, NULL);
5006 if (!nla[NFTA_SET_ELEM_KEY])
5009 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
5013 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
5014 nla[NFTA_SET_ELEM_KEY]);
5018 if (nla[NFTA_SET_ELEM_KEY_END]) {
5019 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
5020 nla[NFTA_SET_ELEM_KEY_END]);
5025 priv = set->ops->get(ctx->net, set, &elem, flags);
5027 return PTR_ERR(priv);
5032 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
5036 err = nf_tables_fill_setelem_info(skb, ctx, ctx->seq, ctx->portid,
5037 NFT_MSG_NEWSETELEM, 0, set, &elem);
5039 goto err_fill_setelem;
5041 return nfnetlink_unicast(skb, ctx->net, ctx->portid);
5048 /* called with rcu_read_lock held */
5049 static int nf_tables_getsetelem(struct net *net, struct sock *nlsk,
5050 struct sk_buff *skb, const struct nlmsghdr *nlh,
5051 const struct nlattr * const nla[],
5052 struct netlink_ext_ack *extack)
5054 u8 genmask = nft_genmask_cur(net);
5055 struct nft_set *set;
5056 struct nlattr *attr;
5060 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack,
5061 genmask, NETLINK_CB(skb).portid);
5065 set = nft_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
5067 return PTR_ERR(set);
5069 if (nlh->nlmsg_flags & NLM_F_DUMP) {
5070 struct netlink_dump_control c = {
5071 .start = nf_tables_dump_set_start,
5072 .dump = nf_tables_dump_set,
5073 .done = nf_tables_dump_set_done,
5074 .module = THIS_MODULE,
5076 struct nft_set_dump_ctx dump_ctx = {
5082 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
5085 if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
5088 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
5089 err = nft_get_set_elem(&ctx, set, attr);
5097 static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
5098 const struct nft_set *set,
5099 const struct nft_set_elem *elem,
5100 int event, u16 flags)
5102 struct net *net = ctx->net;
5103 u32 portid = ctx->portid;
5104 struct sk_buff *skb;
5106 char *buf = kasprintf(GFP_KERNEL, "%s:%llu;%s:%llu",
5107 ctx->table->name, ctx->table->handle,
5108 set->name, set->handle);
5110 audit_log_nfcfg(buf,
5113 event == NFT_MSG_NEWSETELEM ?
5114 AUDIT_NFT_OP_SETELEM_REGISTER :
5115 AUDIT_NFT_OP_SETELEM_UNREGISTER,
5119 if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
5122 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
5126 err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
5133 nft_notify_enqueue(skb, ctx->report, &ctx->net->nft.notify_list);
5136 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
5139 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
5141 struct nft_set *set)
5143 struct nft_trans *trans;
5145 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
5149 nft_trans_elem_set(trans) = set;
5153 struct nft_expr *nft_set_elem_expr_alloc(const struct nft_ctx *ctx,
5154 const struct nft_set *set,
5155 const struct nlattr *attr)
5157 struct nft_expr *expr;
5160 expr = nft_expr_init(ctx, attr);
5165 if (!(expr->ops->type->flags & NFT_EXPR_STATEFUL))
5166 goto err_set_elem_expr;
5168 if (expr->ops->type->flags & NFT_EXPR_GC) {
5169 if (set->flags & NFT_SET_TIMEOUT)
5170 goto err_set_elem_expr;
5171 if (!set->ops->gc_init)
5172 goto err_set_elem_expr;
5173 set->ops->gc_init(set);
5179 nft_expr_destroy(ctx, expr);
5180 return ERR_PTR(err);
5183 void *nft_set_elem_init(const struct nft_set *set,
5184 const struct nft_set_ext_tmpl *tmpl,
5185 const u32 *key, const u32 *key_end,
5186 const u32 *data, u64 timeout, u64 expiration, gfp_t gfp)
5188 struct nft_set_ext *ext;
5191 elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
5195 ext = nft_set_elem_ext(set, elem);
5196 nft_set_ext_init(ext, tmpl);
5198 memcpy(nft_set_ext_key(ext), key, set->klen);
5199 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END))
5200 memcpy(nft_set_ext_key_end(ext), key_end, set->klen);
5201 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
5202 memcpy(nft_set_ext_data(ext), data, set->dlen);
5203 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
5204 *nft_set_ext_expiration(ext) = get_jiffies_64() + expiration;
5205 if (expiration == 0)
5206 *nft_set_ext_expiration(ext) += timeout;
5208 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
5209 *nft_set_ext_timeout(ext) = timeout;
5214 static void __nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
5215 struct nft_expr *expr)
5217 if (expr->ops->destroy_clone) {
5218 expr->ops->destroy_clone(ctx, expr);
5219 module_put(expr->ops->type->owner);
5221 nf_tables_expr_destroy(ctx, expr);
5225 static void nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
5226 struct nft_set_elem_expr *elem_expr)
5228 struct nft_expr *expr;
5231 nft_setelem_expr_foreach(expr, elem_expr, size)
5232 __nft_set_elem_expr_destroy(ctx, expr);
5235 void nft_set_elem_destroy(const struct nft_set *set, void *elem,
5238 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
5239 struct nft_ctx ctx = {
5240 .net = read_pnet(&set->net),
5241 .family = set->table->family,
5244 nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE);
5245 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
5246 nft_data_release(nft_set_ext_data(ext), set->dtype);
5247 if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
5248 nft_set_elem_expr_destroy(&ctx, nft_set_ext_expr(ext));
5250 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
5251 (*nft_set_ext_obj(ext))->use--;
5254 EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
5256 /* Only called from commit path, nft_set_elem_deactivate() already deals with
5257 * the refcounting from the preparation phase.
5259 static void nf_tables_set_elem_destroy(const struct nft_ctx *ctx,
5260 const struct nft_set *set, void *elem)
5262 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
5264 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
5265 nft_set_elem_expr_destroy(ctx, nft_set_ext_expr(ext));
5270 int nft_set_elem_expr_clone(const struct nft_ctx *ctx, struct nft_set *set,
5271 struct nft_expr *expr_array[])
5273 struct nft_expr *expr;
5276 for (i = 0; i < set->num_exprs; i++) {
5277 expr = kzalloc(set->exprs[i]->ops->size, GFP_KERNEL);
5281 err = nft_expr_clone(expr, set->exprs[i]);
5283 nft_expr_destroy(ctx, expr);
5286 expr_array[i] = expr;
5292 for (k = i - 1; k >= 0; k--)
5293 nft_expr_destroy(ctx, expr_array[k]);
5298 static int nft_set_elem_expr_setup(struct nft_ctx *ctx,
5299 const struct nft_set_ext *ext,
5300 struct nft_expr *expr_array[],
5303 struct nft_set_elem_expr *elem_expr = nft_set_ext_expr(ext);
5304 struct nft_expr *expr;
5307 for (i = 0; i < num_exprs; i++) {
5308 expr = nft_setelem_expr_at(elem_expr, elem_expr->size);
5309 err = nft_expr_clone(expr, expr_array[i]);
5311 goto err_elem_expr_setup;
5313 elem_expr->size += expr_array[i]->ops->size;
5314 nft_expr_destroy(ctx, expr_array[i]);
5315 expr_array[i] = NULL;
5320 err_elem_expr_setup:
5321 for (; i < num_exprs; i++) {
5322 nft_expr_destroy(ctx, expr_array[i]);
5323 expr_array[i] = NULL;
5329 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
5330 const struct nlattr *attr, u32 nlmsg_flags)
5332 struct nft_expr *expr_array[NFT_SET_EXPR_MAX] = {};
5333 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
5334 u8 genmask = nft_genmask_next(ctx->net);
5335 u32 flags = 0, size = 0, num_exprs = 0;
5336 struct nft_set_ext_tmpl tmpl;
5337 struct nft_set_ext *ext, *ext2;
5338 struct nft_set_elem elem;
5339 struct nft_set_binding *binding;
5340 struct nft_object *obj = NULL;
5341 struct nft_userdata *udata;
5342 struct nft_data_desc desc;
5343 enum nft_registers dreg;
5344 struct nft_trans *trans;
5350 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
5351 nft_set_elem_policy, NULL);
5355 if (nla[NFTA_SET_ELEM_KEY] == NULL)
5358 nft_set_ext_prepare(&tmpl);
5360 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
5364 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
5366 if (set->flags & NFT_SET_MAP) {
5367 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
5368 !(flags & NFT_SET_ELEM_INTERVAL_END))
5371 if (nla[NFTA_SET_ELEM_DATA] != NULL)
5375 if ((flags & NFT_SET_ELEM_INTERVAL_END) &&
5376 (nla[NFTA_SET_ELEM_DATA] ||
5377 nla[NFTA_SET_ELEM_OBJREF] ||
5378 nla[NFTA_SET_ELEM_TIMEOUT] ||
5379 nla[NFTA_SET_ELEM_EXPIRATION] ||
5380 nla[NFTA_SET_ELEM_USERDATA] ||
5381 nla[NFTA_SET_ELEM_EXPR] ||
5382 nla[NFTA_SET_ELEM_EXPRESSIONS]))
5386 if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
5387 if (!(set->flags & NFT_SET_TIMEOUT))
5389 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_TIMEOUT],
5393 } else if (set->flags & NFT_SET_TIMEOUT) {
5394 timeout = set->timeout;
5398 if (nla[NFTA_SET_ELEM_EXPIRATION] != NULL) {
5399 if (!(set->flags & NFT_SET_TIMEOUT))
5401 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_EXPIRATION],
5407 if (nla[NFTA_SET_ELEM_EXPR]) {
5408 struct nft_expr *expr;
5410 if (set->num_exprs && set->num_exprs != 1)
5413 expr = nft_set_elem_expr_alloc(ctx, set,
5414 nla[NFTA_SET_ELEM_EXPR]);
5416 return PTR_ERR(expr);
5418 expr_array[0] = expr;
5421 if (set->num_exprs && set->exprs[0]->ops != expr->ops) {
5423 goto err_set_elem_expr;
5425 } else if (nla[NFTA_SET_ELEM_EXPRESSIONS]) {
5426 struct nft_expr *expr;
5431 nla_for_each_nested(tmp, nla[NFTA_SET_ELEM_EXPRESSIONS], left) {
5432 if (i == NFT_SET_EXPR_MAX ||
5433 (set->num_exprs && set->num_exprs == i)) {
5435 goto err_set_elem_expr;
5437 if (nla_type(tmp) != NFTA_LIST_ELEM) {
5439 goto err_set_elem_expr;
5441 expr = nft_set_elem_expr_alloc(ctx, set, tmp);
5443 err = PTR_ERR(expr);
5444 goto err_set_elem_expr;
5446 expr_array[i] = expr;
5449 if (set->num_exprs && expr->ops != set->exprs[i]->ops) {
5451 goto err_set_elem_expr;
5455 if (set->num_exprs && set->num_exprs != i) {
5457 goto err_set_elem_expr;
5459 } else if (set->num_exprs > 0) {
5460 err = nft_set_elem_expr_clone(ctx, set, expr_array);
5462 goto err_set_elem_expr_clone;
5464 num_exprs = set->num_exprs;
5467 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
5468 nla[NFTA_SET_ELEM_KEY]);
5470 goto err_set_elem_expr;
5472 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
5474 if (nla[NFTA_SET_ELEM_KEY_END]) {
5475 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
5476 nla[NFTA_SET_ELEM_KEY_END]);
5480 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
5484 nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
5485 if (timeout != set->timeout)
5486 nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
5490 for (i = 0; i < num_exprs; i++)
5491 size += expr_array[i]->ops->size;
5493 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_EXPRESSIONS,
5494 sizeof(struct nft_set_elem_expr) +
5498 if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
5499 if (!(set->flags & NFT_SET_OBJECT)) {
5501 goto err_parse_key_end;
5503 obj = nft_obj_lookup(ctx->net, ctx->table,
5504 nla[NFTA_SET_ELEM_OBJREF],
5505 set->objtype, genmask);
5508 goto err_parse_key_end;
5510 nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
5513 if (nla[NFTA_SET_ELEM_DATA] != NULL) {
5514 err = nft_setelem_parse_data(ctx, set, &desc, &elem.data.val,
5515 nla[NFTA_SET_ELEM_DATA]);
5517 goto err_parse_key_end;
5519 dreg = nft_type_to_reg(set->dtype);
5520 list_for_each_entry(binding, &set->bindings, list) {
5521 struct nft_ctx bind_ctx = {
5523 .family = ctx->family,
5524 .table = ctx->table,
5525 .chain = (struct nft_chain *)binding->chain,
5528 if (!(binding->flags & NFT_SET_MAP))
5531 err = nft_validate_register_store(&bind_ctx, dreg,
5533 desc.type, desc.len);
5535 goto err_parse_data;
5537 if (desc.type == NFT_DATA_VERDICT &&
5538 (elem.data.val.verdict.code == NFT_GOTO ||
5539 elem.data.val.verdict.code == NFT_JUMP))
5540 nft_validate_state_update(ctx->net,
5544 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, desc.len);
5547 /* The full maximum length of userdata can exceed the maximum
5548 * offset value (U8_MAX) for following extensions, therefor it
5549 * must be the last extension added.
5552 if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
5553 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
5555 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
5560 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
5561 elem.key_end.val.data, elem.data.val.data,
5562 timeout, expiration, GFP_KERNEL);
5563 if (elem.priv == NULL)
5564 goto err_parse_data;
5566 ext = nft_set_elem_ext(set, elem.priv);
5568 *nft_set_ext_flags(ext) = flags;
5570 udata = nft_set_ext_userdata(ext);
5571 udata->len = ulen - 1;
5572 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
5575 *nft_set_ext_obj(ext) = obj;
5578 err = nft_set_elem_expr_setup(ctx, ext, expr_array, num_exprs);
5582 trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
5583 if (trans == NULL) {
5588 ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK;
5589 err = set->ops->insert(ctx->net, set, &elem, &ext2);
5591 if (err == -EEXIST) {
5592 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^
5593 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) ||
5594 nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^
5595 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF))
5596 goto err_element_clash;
5597 if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
5598 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
5599 memcmp(nft_set_ext_data(ext),
5600 nft_set_ext_data(ext2), set->dlen) != 0) ||
5601 (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
5602 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
5603 *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
5604 goto err_element_clash;
5605 else if (!(nlmsg_flags & NLM_F_EXCL))
5607 } else if (err == -ENOTEMPTY) {
5608 /* ENOTEMPTY reports overlapping between this element
5609 * and an existing one.
5613 goto err_element_clash;
5617 !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact)) {
5622 nft_trans_elem(trans) = elem;
5623 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
5627 set->ops->remove(ctx->net, set, &elem);
5634 nf_tables_set_elem_destroy(ctx, set, elem.priv);
5636 if (nla[NFTA_SET_ELEM_DATA] != NULL)
5637 nft_data_release(&elem.data.val, desc.type);
5639 nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
5641 nft_data_release(&elem.key.val, NFT_DATA_VALUE);
5643 for (i = 0; i < num_exprs && expr_array[i]; i++)
5644 nft_expr_destroy(ctx, expr_array[i]);
5645 err_set_elem_expr_clone:
5649 static int nf_tables_newsetelem(struct net *net, struct sock *nlsk,
5650 struct sk_buff *skb, const struct nlmsghdr *nlh,
5651 const struct nlattr * const nla[],
5652 struct netlink_ext_ack *extack)
5654 u8 genmask = nft_genmask_next(net);
5655 const struct nlattr *attr;
5656 struct nft_set *set;
5660 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
5663 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack,
5664 genmask, NETLINK_CB(skb).portid);
5668 set = nft_set_lookup_global(net, ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
5669 nla[NFTA_SET_ELEM_LIST_SET_ID], genmask);
5671 return PTR_ERR(set);
5673 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
5676 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
5677 err = nft_add_set_elem(&ctx, set, attr, nlh->nlmsg_flags);
5682 if (net->nft.validate_state == NFT_VALIDATE_DO)
5683 return nft_table_validate(net, ctx.table);
5689 * nft_data_hold - hold a nft_data item
5691 * @data: struct nft_data to release
5692 * @type: type of data
5694 * Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded,
5695 * NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and
5696 * NFT_GOTO verdicts. This function must be called on active data objects
5697 * from the second phase of the commit protocol.
5699 void nft_data_hold(const struct nft_data *data, enum nft_data_types type)
5701 struct nft_chain *chain;
5702 struct nft_rule *rule;
5704 if (type == NFT_DATA_VERDICT) {
5705 switch (data->verdict.code) {
5708 chain = data->verdict.chain;
5711 if (!nft_chain_is_bound(chain))
5714 chain->table->use++;
5715 list_for_each_entry(rule, &chain->rules, list)
5718 nft_chain_add(chain->table, chain);
5724 static void nft_set_elem_activate(const struct net *net,
5725 const struct nft_set *set,
5726 struct nft_set_elem *elem)
5728 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5730 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
5731 nft_data_hold(nft_set_ext_data(ext), set->dtype);
5732 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
5733 (*nft_set_ext_obj(ext))->use++;
5736 static void nft_set_elem_deactivate(const struct net *net,
5737 const struct nft_set *set,
5738 struct nft_set_elem *elem)
5740 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5742 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
5743 nft_data_release(nft_set_ext_data(ext), set->dtype);
5744 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
5745 (*nft_set_ext_obj(ext))->use--;
5748 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
5749 const struct nlattr *attr)
5751 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
5752 struct nft_set_ext_tmpl tmpl;
5753 struct nft_set_elem elem;
5754 struct nft_set_ext *ext;
5755 struct nft_trans *trans;
5760 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
5761 nft_set_elem_policy, NULL);
5765 if (nla[NFTA_SET_ELEM_KEY] == NULL)
5768 nft_set_ext_prepare(&tmpl);
5770 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
5774 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
5776 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
5777 nla[NFTA_SET_ELEM_KEY]);
5781 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
5783 if (nla[NFTA_SET_ELEM_KEY_END]) {
5784 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
5785 nla[NFTA_SET_ELEM_KEY_END]);
5789 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
5793 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
5794 elem.key_end.val.data, NULL, 0, 0,
5796 if (elem.priv == NULL)
5799 ext = nft_set_elem_ext(set, elem.priv);
5801 *nft_set_ext_flags(ext) = flags;
5803 trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
5807 priv = set->ops->deactivate(ctx->net, set, &elem);
5815 nft_set_elem_deactivate(ctx->net, set, &elem);
5817 nft_trans_elem(trans) = elem;
5818 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
5826 nft_data_release(&elem.key.val, NFT_DATA_VALUE);
5830 static int nft_flush_set(const struct nft_ctx *ctx,
5831 struct nft_set *set,
5832 const struct nft_set_iter *iter,
5833 struct nft_set_elem *elem)
5835 struct nft_trans *trans;
5838 trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
5839 sizeof(struct nft_trans_elem), GFP_ATOMIC);
5843 if (!set->ops->flush(ctx->net, set, elem->priv)) {
5849 nft_set_elem_deactivate(ctx->net, set, elem);
5850 nft_trans_elem_set(trans) = set;
5851 nft_trans_elem(trans) = *elem;
5852 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
5860 static int nf_tables_delsetelem(struct net *net, struct sock *nlsk,
5861 struct sk_buff *skb, const struct nlmsghdr *nlh,
5862 const struct nlattr * const nla[],
5863 struct netlink_ext_ack *extack)
5865 u8 genmask = nft_genmask_next(net);
5866 const struct nlattr *attr;
5867 struct nft_set *set;
5871 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack,
5872 genmask, NETLINK_CB(skb).portid);
5876 set = nft_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
5878 return PTR_ERR(set);
5879 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
5882 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL) {
5883 struct nft_set_iter iter = {
5885 .fn = nft_flush_set,
5887 set->ops->walk(&ctx, set, &iter);
5892 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
5893 err = nft_del_setelem(&ctx, set, attr);
5902 void nft_set_gc_batch_release(struct rcu_head *rcu)
5904 struct nft_set_gc_batch *gcb;
5907 gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu);
5908 for (i = 0; i < gcb->head.cnt; i++)
5909 nft_set_elem_destroy(gcb->head.set, gcb->elems[i], true);
5913 struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
5916 struct nft_set_gc_batch *gcb;
5918 gcb = kzalloc(sizeof(*gcb), gfp);
5921 gcb->head.set = set;
5930 * nft_register_obj- register nf_tables stateful object type
5931 * @obj_type: object type
5933 * Registers the object type for use with nf_tables. Returns zero on
5934 * success or a negative errno code otherwise.
5936 int nft_register_obj(struct nft_object_type *obj_type)
5938 if (obj_type->type == NFT_OBJECT_UNSPEC)
5941 nfnl_lock(NFNL_SUBSYS_NFTABLES);
5942 list_add_rcu(&obj_type->list, &nf_tables_objects);
5943 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
5946 EXPORT_SYMBOL_GPL(nft_register_obj);
5949 * nft_unregister_obj - unregister nf_tables object type
5950 * @obj_type: object type
5952 * Unregisters the object type for use with nf_tables.
5954 void nft_unregister_obj(struct nft_object_type *obj_type)
5956 nfnl_lock(NFNL_SUBSYS_NFTABLES);
5957 list_del_rcu(&obj_type->list);
5958 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
5960 EXPORT_SYMBOL_GPL(nft_unregister_obj);
5962 struct nft_object *nft_obj_lookup(const struct net *net,
5963 const struct nft_table *table,
5964 const struct nlattr *nla, u32 objtype,
5967 struct nft_object_hash_key k = { .table = table };
5968 char search[NFT_OBJ_MAXNAMELEN];
5969 struct rhlist_head *tmp, *list;
5970 struct nft_object *obj;
5972 nla_strscpy(search, nla, sizeof(search));
5975 WARN_ON_ONCE(!rcu_read_lock_held() &&
5976 !lockdep_commit_lock_is_held(net));
5979 list = rhltable_lookup(&nft_objname_ht, &k, nft_objname_ht_params);
5983 rhl_for_each_entry_rcu(obj, tmp, list, rhlhead) {
5984 if (objtype == obj->ops->type->type &&
5985 nft_active_genmask(obj, genmask)) {
5992 return ERR_PTR(-ENOENT);
5994 EXPORT_SYMBOL_GPL(nft_obj_lookup);
5996 static struct nft_object *nft_obj_lookup_byhandle(const struct nft_table *table,
5997 const struct nlattr *nla,
5998 u32 objtype, u8 genmask)
6000 struct nft_object *obj;
6002 list_for_each_entry(obj, &table->objects, list) {
6003 if (be64_to_cpu(nla_get_be64(nla)) == obj->handle &&
6004 objtype == obj->ops->type->type &&
6005 nft_active_genmask(obj, genmask))
6008 return ERR_PTR(-ENOENT);
6011 static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
6012 [NFTA_OBJ_TABLE] = { .type = NLA_STRING,
6013 .len = NFT_TABLE_MAXNAMELEN - 1 },
6014 [NFTA_OBJ_NAME] = { .type = NLA_STRING,
6015 .len = NFT_OBJ_MAXNAMELEN - 1 },
6016 [NFTA_OBJ_TYPE] = { .type = NLA_U32 },
6017 [NFTA_OBJ_DATA] = { .type = NLA_NESTED },
6018 [NFTA_OBJ_HANDLE] = { .type = NLA_U64},
6019 [NFTA_OBJ_USERDATA] = { .type = NLA_BINARY,
6020 .len = NFT_USERDATA_MAXLEN },
6023 static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,
6024 const struct nft_object_type *type,
6025 const struct nlattr *attr)
6028 const struct nft_object_ops *ops;
6029 struct nft_object *obj;
6032 tb = kmalloc_array(type->maxattr + 1, sizeof(*tb), GFP_KERNEL);
6037 err = nla_parse_nested_deprecated(tb, type->maxattr, attr,
6038 type->policy, NULL);
6042 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
6045 if (type->select_ops) {
6046 ops = type->select_ops(ctx, (const struct nlattr * const *)tb);
6056 obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL);
6060 err = ops->init(ctx, (const struct nlattr * const *)tb, obj);
6073 return ERR_PTR(err);
6076 static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
6077 struct nft_object *obj, bool reset)
6079 struct nlattr *nest;
6081 nest = nla_nest_start_noflag(skb, attr);
6083 goto nla_put_failure;
6084 if (obj->ops->dump(skb, obj, reset) < 0)
6085 goto nla_put_failure;
6086 nla_nest_end(skb, nest);
6093 static const struct nft_object_type *__nft_obj_type_get(u32 objtype)
6095 const struct nft_object_type *type;
6097 list_for_each_entry(type, &nf_tables_objects, list) {
6098 if (objtype == type->type)
6104 static const struct nft_object_type *
6105 nft_obj_type_get(struct net *net, u32 objtype)
6107 const struct nft_object_type *type;
6109 type = __nft_obj_type_get(objtype);
6110 if (type != NULL && try_module_get(type->owner))
6113 lockdep_nfnl_nft_mutex_not_held();
6114 #ifdef CONFIG_MODULES
6116 if (nft_request_module(net, "nft-obj-%u", objtype) == -EAGAIN)
6117 return ERR_PTR(-EAGAIN);
6120 return ERR_PTR(-ENOENT);
6123 static int nf_tables_updobj(const struct nft_ctx *ctx,
6124 const struct nft_object_type *type,
6125 const struct nlattr *attr,
6126 struct nft_object *obj)
6128 struct nft_object *newobj;
6129 struct nft_trans *trans;
6132 trans = nft_trans_alloc(ctx, NFT_MSG_NEWOBJ,
6133 sizeof(struct nft_trans_obj));
6137 newobj = nft_obj_init(ctx, type, attr);
6138 if (IS_ERR(newobj)) {
6139 err = PTR_ERR(newobj);
6140 goto err_free_trans;
6143 nft_trans_obj(trans) = obj;
6144 nft_trans_obj_update(trans) = true;
6145 nft_trans_obj_newobj(trans) = newobj;
6146 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
6155 static int nf_tables_newobj(struct net *net, struct sock *nlsk,
6156 struct sk_buff *skb, const struct nlmsghdr *nlh,
6157 const struct nlattr * const nla[],
6158 struct netlink_ext_ack *extack)
6160 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
6161 const struct nft_object_type *type;
6162 u8 genmask = nft_genmask_next(net);
6163 int family = nfmsg->nfgen_family;
6164 struct nft_table *table;
6165 struct nft_object *obj;
6170 if (!nla[NFTA_OBJ_TYPE] ||
6171 !nla[NFTA_OBJ_NAME] ||
6172 !nla[NFTA_OBJ_DATA])
6175 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
6176 NETLINK_CB(skb).portid);
6177 if (IS_ERR(table)) {
6178 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
6179 return PTR_ERR(table);
6182 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
6183 obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
6186 if (err != -ENOENT) {
6187 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
6191 if (nlh->nlmsg_flags & NLM_F_EXCL) {
6192 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
6195 if (nlh->nlmsg_flags & NLM_F_REPLACE)
6198 type = __nft_obj_type_get(objtype);
6199 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
6201 return nf_tables_updobj(&ctx, type, nla[NFTA_OBJ_DATA], obj);
6204 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
6206 type = nft_obj_type_get(net, objtype);
6208 return PTR_ERR(type);
6210 obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]);
6215 obj->key.table = table;
6216 obj->handle = nf_tables_alloc_handle(table);
6218 obj->key.name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL);
6219 if (!obj->key.name) {
6224 if (nla[NFTA_OBJ_USERDATA]) {
6225 obj->udata = nla_memdup(nla[NFTA_OBJ_USERDATA], GFP_KERNEL);
6226 if (obj->udata == NULL)
6229 obj->udlen = nla_len(nla[NFTA_OBJ_USERDATA]);
6232 err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
6236 err = rhltable_insert(&nft_objname_ht, &obj->rhlhead,
6237 nft_objname_ht_params);
6241 list_add_tail_rcu(&obj->list, &table->objects);
6245 /* queued in transaction log */
6246 INIT_LIST_HEAD(&obj->list);
6249 kfree(obj->key.name);
6253 if (obj->ops->destroy)
6254 obj->ops->destroy(&ctx, obj);
6257 module_put(type->owner);
6261 static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
6262 u32 portid, u32 seq, int event, u32 flags,
6263 int family, const struct nft_table *table,
6264 struct nft_object *obj, bool reset)
6266 struct nfgenmsg *nfmsg;
6267 struct nlmsghdr *nlh;
6269 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
6270 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
6272 goto nla_put_failure;
6274 nfmsg = nlmsg_data(nlh);
6275 nfmsg->nfgen_family = family;
6276 nfmsg->version = NFNETLINK_V0;
6277 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
6279 if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
6280 nla_put_string(skb, NFTA_OBJ_NAME, obj->key.name) ||
6281 nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) ||
6282 nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
6283 nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset) ||
6284 nla_put_be64(skb, NFTA_OBJ_HANDLE, cpu_to_be64(obj->handle),
6286 goto nla_put_failure;
6289 nla_put(skb, NFTA_OBJ_USERDATA, obj->udlen, obj->udata))
6290 goto nla_put_failure;
6292 nlmsg_end(skb, nlh);
6296 nlmsg_trim(skb, nlh);
6300 struct nft_obj_filter {
6305 static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
6307 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
6308 const struct nft_table *table;
6309 unsigned int idx = 0, s_idx = cb->args[0];
6310 struct nft_obj_filter *filter = cb->data;
6311 struct net *net = sock_net(skb->sk);
6312 int family = nfmsg->nfgen_family;
6313 struct nft_object *obj;
6316 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
6320 cb->seq = net->nft.base_seq;
6322 list_for_each_entry_rcu(table, &net->nft.tables, list) {
6323 if (family != NFPROTO_UNSPEC && family != table->family)
6326 list_for_each_entry_rcu(obj, &table->objects, list) {
6327 if (!nft_is_active(net, obj))
6332 memset(&cb->args[1], 0,
6333 sizeof(cb->args) - sizeof(cb->args[0]));
6334 if (filter && filter->table &&
6335 strcmp(filter->table, table->name))
6338 filter->type != NFT_OBJECT_UNSPEC &&
6339 obj->ops->type->type != filter->type)
6343 char *buf = kasprintf(GFP_ATOMIC,
6348 audit_log_nfcfg(buf,
6351 AUDIT_NFT_OP_OBJ_RESET,
6356 if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid,
6359 NLM_F_MULTI | NLM_F_APPEND,
6360 table->family, table,
6364 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
6376 static int nf_tables_dump_obj_start(struct netlink_callback *cb)
6378 const struct nlattr * const *nla = cb->data;
6379 struct nft_obj_filter *filter = NULL;
6381 if (nla[NFTA_OBJ_TABLE] || nla[NFTA_OBJ_TYPE]) {
6382 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
6386 if (nla[NFTA_OBJ_TABLE]) {
6387 filter->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_ATOMIC);
6388 if (!filter->table) {
6394 if (nla[NFTA_OBJ_TYPE])
6395 filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
6402 static int nf_tables_dump_obj_done(struct netlink_callback *cb)
6404 struct nft_obj_filter *filter = cb->data;
6407 kfree(filter->table);
6414 /* called with rcu_read_lock held */
6415 static int nf_tables_getobj(struct net *net, struct sock *nlsk,
6416 struct sk_buff *skb, const struct nlmsghdr *nlh,
6417 const struct nlattr * const nla[],
6418 struct netlink_ext_ack *extack)
6420 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
6421 u8 genmask = nft_genmask_cur(net);
6422 int family = nfmsg->nfgen_family;
6423 const struct nft_table *table;
6424 struct nft_object *obj;
6425 struct sk_buff *skb2;
6430 if (nlh->nlmsg_flags & NLM_F_DUMP) {
6431 struct netlink_dump_control c = {
6432 .start = nf_tables_dump_obj_start,
6433 .dump = nf_tables_dump_obj,
6434 .done = nf_tables_dump_obj_done,
6435 .module = THIS_MODULE,
6436 .data = (void *)nla,
6439 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
6442 if (!nla[NFTA_OBJ_NAME] ||
6443 !nla[NFTA_OBJ_TYPE])
6446 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask, 0);
6447 if (IS_ERR(table)) {
6448 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
6449 return PTR_ERR(table);
6452 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
6453 obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
6455 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
6456 return PTR_ERR(obj);
6459 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
6463 if (NFNL_MSG_TYPE(nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
6467 char *buf = kasprintf(GFP_ATOMIC, "%s:%llu;?:0",
6468 table->name, table->handle);
6470 audit_log_nfcfg(buf,
6473 AUDIT_NFT_OP_OBJ_RESET,
6478 err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
6479 nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
6480 family, table, obj, reset);
6482 goto err_fill_obj_info;
6484 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
6491 static void nft_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj)
6493 if (obj->ops->destroy)
6494 obj->ops->destroy(ctx, obj);
6496 module_put(obj->ops->type->owner);
6497 kfree(obj->key.name);
6502 static int nf_tables_delobj(struct net *net, struct sock *nlsk,
6503 struct sk_buff *skb, const struct nlmsghdr *nlh,
6504 const struct nlattr * const nla[],
6505 struct netlink_ext_ack *extack)
6507 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
6508 u8 genmask = nft_genmask_next(net);
6509 int family = nfmsg->nfgen_family;
6510 const struct nlattr *attr;
6511 struct nft_table *table;
6512 struct nft_object *obj;
6516 if (!nla[NFTA_OBJ_TYPE] ||
6517 (!nla[NFTA_OBJ_NAME] && !nla[NFTA_OBJ_HANDLE]))
6520 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
6521 NETLINK_CB(skb).portid);
6522 if (IS_ERR(table)) {
6523 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
6524 return PTR_ERR(table);
6527 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
6528 if (nla[NFTA_OBJ_HANDLE]) {
6529 attr = nla[NFTA_OBJ_HANDLE];
6530 obj = nft_obj_lookup_byhandle(table, attr, objtype, genmask);
6532 attr = nla[NFTA_OBJ_NAME];
6533 obj = nft_obj_lookup(net, table, attr, objtype, genmask);
6537 NL_SET_BAD_ATTR(extack, attr);
6538 return PTR_ERR(obj);
6541 NL_SET_BAD_ATTR(extack, attr);
6545 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
6547 return nft_delobj(&ctx, obj);
6550 void nft_obj_notify(struct net *net, const struct nft_table *table,
6551 struct nft_object *obj, u32 portid, u32 seq, int event,
6552 int family, int report, gfp_t gfp)
6554 struct sk_buff *skb;
6556 char *buf = kasprintf(gfp, "%s:%llu;?:0",
6557 table->name, table->handle);
6559 audit_log_nfcfg(buf,
6562 event == NFT_MSG_NEWOBJ ?
6563 AUDIT_NFT_OP_OBJ_REGISTER :
6564 AUDIT_NFT_OP_OBJ_UNREGISTER,
6569 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
6572 skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
6576 err = nf_tables_fill_obj_info(skb, net, portid, seq, event, 0, family,
6583 nft_notify_enqueue(skb, report, &net->nft.notify_list);
6586 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
6588 EXPORT_SYMBOL_GPL(nft_obj_notify);
6590 static void nf_tables_obj_notify(const struct nft_ctx *ctx,
6591 struct nft_object *obj, int event)
6593 nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid, ctx->seq, event,
6594 ctx->family, ctx->report, GFP_KERNEL);
6600 void nft_register_flowtable_type(struct nf_flowtable_type *type)
6602 nfnl_lock(NFNL_SUBSYS_NFTABLES);
6603 list_add_tail_rcu(&type->list, &nf_tables_flowtables);
6604 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
6606 EXPORT_SYMBOL_GPL(nft_register_flowtable_type);
6608 void nft_unregister_flowtable_type(struct nf_flowtable_type *type)
6610 nfnl_lock(NFNL_SUBSYS_NFTABLES);
6611 list_del_rcu(&type->list);
6612 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
6614 EXPORT_SYMBOL_GPL(nft_unregister_flowtable_type);
6616 static const struct nla_policy nft_flowtable_policy[NFTA_FLOWTABLE_MAX + 1] = {
6617 [NFTA_FLOWTABLE_TABLE] = { .type = NLA_STRING,
6618 .len = NFT_NAME_MAXLEN - 1 },
6619 [NFTA_FLOWTABLE_NAME] = { .type = NLA_STRING,
6620 .len = NFT_NAME_MAXLEN - 1 },
6621 [NFTA_FLOWTABLE_HOOK] = { .type = NLA_NESTED },
6622 [NFTA_FLOWTABLE_HANDLE] = { .type = NLA_U64 },
6623 [NFTA_FLOWTABLE_FLAGS] = { .type = NLA_U32 },
6626 struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table,
6627 const struct nlattr *nla, u8 genmask)
6629 struct nft_flowtable *flowtable;
6631 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
6632 if (!nla_strcmp(nla, flowtable->name) &&
6633 nft_active_genmask(flowtable, genmask))
6636 return ERR_PTR(-ENOENT);
6638 EXPORT_SYMBOL_GPL(nft_flowtable_lookup);
6640 void nf_tables_deactivate_flowtable(const struct nft_ctx *ctx,
6641 struct nft_flowtable *flowtable,
6642 enum nft_trans_phase phase)
6645 case NFT_TRANS_PREPARE:
6646 case NFT_TRANS_ABORT:
6647 case NFT_TRANS_RELEASE:
6654 EXPORT_SYMBOL_GPL(nf_tables_deactivate_flowtable);
6656 static struct nft_flowtable *
6657 nft_flowtable_lookup_byhandle(const struct nft_table *table,
6658 const struct nlattr *nla, u8 genmask)
6660 struct nft_flowtable *flowtable;
6662 list_for_each_entry(flowtable, &table->flowtables, list) {
6663 if (be64_to_cpu(nla_get_be64(nla)) == flowtable->handle &&
6664 nft_active_genmask(flowtable, genmask))
6667 return ERR_PTR(-ENOENT);
6670 struct nft_flowtable_hook {
6673 struct list_head list;
6676 static const struct nla_policy nft_flowtable_hook_policy[NFTA_FLOWTABLE_HOOK_MAX + 1] = {
6677 [NFTA_FLOWTABLE_HOOK_NUM] = { .type = NLA_U32 },
6678 [NFTA_FLOWTABLE_HOOK_PRIORITY] = { .type = NLA_U32 },
6679 [NFTA_FLOWTABLE_HOOK_DEVS] = { .type = NLA_NESTED },
6682 static int nft_flowtable_parse_hook(const struct nft_ctx *ctx,
6683 const struct nlattr *attr,
6684 struct nft_flowtable_hook *flowtable_hook,
6685 struct nft_flowtable *flowtable, bool add)
6687 struct nlattr *tb[NFTA_FLOWTABLE_HOOK_MAX + 1];
6688 struct nft_hook *hook;
6689 int hooknum, priority;
6692 INIT_LIST_HEAD(&flowtable_hook->list);
6694 err = nla_parse_nested_deprecated(tb, NFTA_FLOWTABLE_HOOK_MAX, attr,
6695 nft_flowtable_hook_policy, NULL);
6700 if (!tb[NFTA_FLOWTABLE_HOOK_NUM] ||
6701 !tb[NFTA_FLOWTABLE_HOOK_PRIORITY])
6704 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
6705 if (hooknum != NF_NETDEV_INGRESS)
6708 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
6710 flowtable_hook->priority = priority;
6711 flowtable_hook->num = hooknum;
6713 if (tb[NFTA_FLOWTABLE_HOOK_NUM]) {
6714 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
6715 if (hooknum != flowtable->hooknum)
6719 if (tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) {
6720 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
6721 if (priority != flowtable->data.priority)
6725 flowtable_hook->priority = flowtable->data.priority;
6726 flowtable_hook->num = flowtable->hooknum;
6729 if (tb[NFTA_FLOWTABLE_HOOK_DEVS]) {
6730 err = nf_tables_parse_netdev_hooks(ctx->net,
6731 tb[NFTA_FLOWTABLE_HOOK_DEVS],
6732 &flowtable_hook->list);
6737 list_for_each_entry(hook, &flowtable_hook->list, list) {
6738 hook->ops.pf = NFPROTO_NETDEV;
6739 hook->ops.hooknum = flowtable_hook->num;
6740 hook->ops.priority = flowtable_hook->priority;
6741 hook->ops.priv = &flowtable->data;
6742 hook->ops.hook = flowtable->data.type->hook;
6748 static const struct nf_flowtable_type *__nft_flowtable_type_get(u8 family)
6750 const struct nf_flowtable_type *type;
6752 list_for_each_entry(type, &nf_tables_flowtables, list) {
6753 if (family == type->family)
6759 static const struct nf_flowtable_type *
6760 nft_flowtable_type_get(struct net *net, u8 family)
6762 const struct nf_flowtable_type *type;
6764 type = __nft_flowtable_type_get(family);
6765 if (type != NULL && try_module_get(type->owner))
6768 lockdep_nfnl_nft_mutex_not_held();
6769 #ifdef CONFIG_MODULES
6771 if (nft_request_module(net, "nf-flowtable-%u", family) == -EAGAIN)
6772 return ERR_PTR(-EAGAIN);
6775 return ERR_PTR(-ENOENT);
6778 /* Only called from error and netdev event paths. */
6779 static void nft_unregister_flowtable_hook(struct net *net,
6780 struct nft_flowtable *flowtable,
6781 struct nft_hook *hook)
6783 nf_unregister_net_hook(net, &hook->ops);
6784 flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
6788 static void nft_unregister_flowtable_net_hooks(struct net *net,
6789 struct list_head *hook_list)
6791 struct nft_hook *hook;
6793 list_for_each_entry(hook, hook_list, list)
6794 nf_unregister_net_hook(net, &hook->ops);
6797 static int nft_register_flowtable_net_hooks(struct net *net,
6798 struct nft_table *table,
6799 struct list_head *hook_list,
6800 struct nft_flowtable *flowtable)
6802 struct nft_hook *hook, *hook2, *next;
6803 struct nft_flowtable *ft;
6806 list_for_each_entry(hook, hook_list, list) {
6807 list_for_each_entry(ft, &table->flowtables, list) {
6808 if (!nft_is_active_next(net, ft))
6811 list_for_each_entry(hook2, &ft->hook_list, list) {
6812 if (hook->ops.dev == hook2->ops.dev &&
6813 hook->ops.pf == hook2->ops.pf) {
6815 goto err_unregister_net_hooks;
6820 err = flowtable->data.type->setup(&flowtable->data,
6824 goto err_unregister_net_hooks;
6826 err = nf_register_net_hook(net, &hook->ops);
6828 flowtable->data.type->setup(&flowtable->data,
6831 goto err_unregister_net_hooks;
6839 err_unregister_net_hooks:
6840 list_for_each_entry_safe(hook, next, hook_list, list) {
6844 nft_unregister_flowtable_hook(net, flowtable, hook);
6845 list_del_rcu(&hook->list);
6846 kfree_rcu(hook, rcu);
6852 static void nft_flowtable_hooks_destroy(struct list_head *hook_list)
6854 struct nft_hook *hook, *next;
6856 list_for_each_entry_safe(hook, next, hook_list, list) {
6857 list_del_rcu(&hook->list);
6858 kfree_rcu(hook, rcu);
6862 static int nft_flowtable_update(struct nft_ctx *ctx, const struct nlmsghdr *nlh,
6863 struct nft_flowtable *flowtable)
6865 const struct nlattr * const *nla = ctx->nla;
6866 struct nft_flowtable_hook flowtable_hook;
6867 struct nft_hook *hook, *next;
6868 struct nft_trans *trans;
6869 bool unregister = false;
6873 err = nft_flowtable_parse_hook(ctx, nla[NFTA_FLOWTABLE_HOOK],
6874 &flowtable_hook, flowtable, false);
6878 list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
6879 if (nft_hook_list_find(&flowtable->hook_list, hook)) {
6880 list_del(&hook->list);
6885 if (nla[NFTA_FLOWTABLE_FLAGS]) {
6886 flags = ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
6887 if (flags & ~NFT_FLOWTABLE_MASK)
6889 if ((flowtable->data.flags & NFT_FLOWTABLE_HW_OFFLOAD) ^
6890 (flags & NFT_FLOWTABLE_HW_OFFLOAD))
6893 flags = flowtable->data.flags;
6896 err = nft_register_flowtable_net_hooks(ctx->net, ctx->table,
6897 &flowtable_hook.list, flowtable);
6899 goto err_flowtable_update_hook;
6901 trans = nft_trans_alloc(ctx, NFT_MSG_NEWFLOWTABLE,
6902 sizeof(struct nft_trans_flowtable));
6906 goto err_flowtable_update_hook;
6909 nft_trans_flowtable_flags(trans) = flags;
6910 nft_trans_flowtable(trans) = flowtable;
6911 nft_trans_flowtable_update(trans) = true;
6912 INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
6913 list_splice(&flowtable_hook.list, &nft_trans_flowtable_hooks(trans));
6915 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
6919 err_flowtable_update_hook:
6920 list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
6922 nft_unregister_flowtable_hook(ctx->net, flowtable, hook);
6923 list_del_rcu(&hook->list);
6924 kfree_rcu(hook, rcu);
6931 static int nf_tables_newflowtable(struct net *net, struct sock *nlsk,
6932 struct sk_buff *skb,
6933 const struct nlmsghdr *nlh,
6934 const struct nlattr * const nla[],
6935 struct netlink_ext_ack *extack)
6937 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
6938 struct nft_flowtable_hook flowtable_hook;
6939 const struct nf_flowtable_type *type;
6940 u8 genmask = nft_genmask_next(net);
6941 int family = nfmsg->nfgen_family;
6942 struct nft_flowtable *flowtable;
6943 struct nft_hook *hook, *next;
6944 struct nft_table *table;
6948 if (!nla[NFTA_FLOWTABLE_TABLE] ||
6949 !nla[NFTA_FLOWTABLE_NAME] ||
6950 !nla[NFTA_FLOWTABLE_HOOK])
6953 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
6954 genmask, NETLINK_CB(skb).portid);
6955 if (IS_ERR(table)) {
6956 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
6957 return PTR_ERR(table);
6960 flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
6962 if (IS_ERR(flowtable)) {
6963 err = PTR_ERR(flowtable);
6964 if (err != -ENOENT) {
6965 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
6969 if (nlh->nlmsg_flags & NLM_F_EXCL) {
6970 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
6974 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
6976 return nft_flowtable_update(&ctx, nlh, flowtable);
6979 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
6981 flowtable = kzalloc(sizeof(*flowtable), GFP_KERNEL);
6985 flowtable->table = table;
6986 flowtable->handle = nf_tables_alloc_handle(table);
6987 INIT_LIST_HEAD(&flowtable->hook_list);
6989 flowtable->name = nla_strdup(nla[NFTA_FLOWTABLE_NAME], GFP_KERNEL);
6990 if (!flowtable->name) {
6995 type = nft_flowtable_type_get(net, family);
6997 err = PTR_ERR(type);
7001 if (nla[NFTA_FLOWTABLE_FLAGS]) {
7002 flowtable->data.flags =
7003 ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
7004 if (flowtable->data.flags & ~NFT_FLOWTABLE_MASK) {
7010 write_pnet(&flowtable->data.net, net);
7011 flowtable->data.type = type;
7012 err = type->init(&flowtable->data);
7016 err = nft_flowtable_parse_hook(&ctx, nla[NFTA_FLOWTABLE_HOOK],
7017 &flowtable_hook, flowtable, true);
7021 list_splice(&flowtable_hook.list, &flowtable->hook_list);
7022 flowtable->data.priority = flowtable_hook.priority;
7023 flowtable->hooknum = flowtable_hook.num;
7025 err = nft_register_flowtable_net_hooks(ctx.net, table,
7026 &flowtable->hook_list,
7029 nft_flowtable_hooks_destroy(&flowtable->hook_list);
7033 err = nft_trans_flowtable_add(&ctx, NFT_MSG_NEWFLOWTABLE, flowtable);
7037 list_add_tail_rcu(&flowtable->list, &table->flowtables);
7042 list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
7043 nft_unregister_flowtable_hook(net, flowtable, hook);
7044 list_del_rcu(&hook->list);
7045 kfree_rcu(hook, rcu);
7048 flowtable->data.type->free(&flowtable->data);
7050 module_put(type->owner);
7052 kfree(flowtable->name);
7058 static void nft_flowtable_hook_release(struct nft_flowtable_hook *flowtable_hook)
7060 struct nft_hook *this, *next;
7062 list_for_each_entry_safe(this, next, &flowtable_hook->list, list) {
7063 list_del(&this->list);
7068 static int nft_delflowtable_hook(struct nft_ctx *ctx,
7069 struct nft_flowtable *flowtable)
7071 const struct nlattr * const *nla = ctx->nla;
7072 struct nft_flowtable_hook flowtable_hook;
7073 struct nft_hook *this, *hook;
7074 struct nft_trans *trans;
7077 err = nft_flowtable_parse_hook(ctx, nla[NFTA_FLOWTABLE_HOOK],
7078 &flowtable_hook, flowtable, false);
7082 list_for_each_entry(this, &flowtable_hook.list, list) {
7083 hook = nft_hook_list_find(&flowtable->hook_list, this);
7086 goto err_flowtable_del_hook;
7088 hook->inactive = true;
7091 trans = nft_trans_alloc(ctx, NFT_MSG_DELFLOWTABLE,
7092 sizeof(struct nft_trans_flowtable));
7095 goto err_flowtable_del_hook;
7098 nft_trans_flowtable(trans) = flowtable;
7099 nft_trans_flowtable_update(trans) = true;
7100 INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
7101 nft_flowtable_hook_release(&flowtable_hook);
7103 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
7107 err_flowtable_del_hook:
7108 list_for_each_entry(this, &flowtable_hook.list, list) {
7109 hook = nft_hook_list_find(&flowtable->hook_list, this);
7113 hook->inactive = false;
7115 nft_flowtable_hook_release(&flowtable_hook);
7120 static int nf_tables_delflowtable(struct net *net, struct sock *nlsk,
7121 struct sk_buff *skb,
7122 const struct nlmsghdr *nlh,
7123 const struct nlattr * const nla[],
7124 struct netlink_ext_ack *extack)
7126 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
7127 u8 genmask = nft_genmask_next(net);
7128 int family = nfmsg->nfgen_family;
7129 struct nft_flowtable *flowtable;
7130 const struct nlattr *attr;
7131 struct nft_table *table;
7134 if (!nla[NFTA_FLOWTABLE_TABLE] ||
7135 (!nla[NFTA_FLOWTABLE_NAME] &&
7136 !nla[NFTA_FLOWTABLE_HANDLE]))
7139 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
7140 genmask, NETLINK_CB(skb).portid);
7141 if (IS_ERR(table)) {
7142 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
7143 return PTR_ERR(table);
7146 if (nla[NFTA_FLOWTABLE_HANDLE]) {
7147 attr = nla[NFTA_FLOWTABLE_HANDLE];
7148 flowtable = nft_flowtable_lookup_byhandle(table, attr, genmask);
7150 attr = nla[NFTA_FLOWTABLE_NAME];
7151 flowtable = nft_flowtable_lookup(table, attr, genmask);
7154 if (IS_ERR(flowtable)) {
7155 NL_SET_BAD_ATTR(extack, attr);
7156 return PTR_ERR(flowtable);
7159 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
7161 if (nla[NFTA_FLOWTABLE_HOOK])
7162 return nft_delflowtable_hook(&ctx, flowtable);
7164 if (flowtable->use > 0) {
7165 NL_SET_BAD_ATTR(extack, attr);
7169 return nft_delflowtable(&ctx, flowtable);
7172 static int nf_tables_fill_flowtable_info(struct sk_buff *skb, struct net *net,
7173 u32 portid, u32 seq, int event,
7174 u32 flags, int family,
7175 struct nft_flowtable *flowtable,
7176 struct list_head *hook_list)
7178 struct nlattr *nest, *nest_devs;
7179 struct nfgenmsg *nfmsg;
7180 struct nft_hook *hook;
7181 struct nlmsghdr *nlh;
7183 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
7184 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
7186 goto nla_put_failure;
7188 nfmsg = nlmsg_data(nlh);
7189 nfmsg->nfgen_family = family;
7190 nfmsg->version = NFNETLINK_V0;
7191 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
7193 if (nla_put_string(skb, NFTA_FLOWTABLE_TABLE, flowtable->table->name) ||
7194 nla_put_string(skb, NFTA_FLOWTABLE_NAME, flowtable->name) ||
7195 nla_put_be32(skb, NFTA_FLOWTABLE_USE, htonl(flowtable->use)) ||
7196 nla_put_be64(skb, NFTA_FLOWTABLE_HANDLE, cpu_to_be64(flowtable->handle),
7197 NFTA_FLOWTABLE_PAD) ||
7198 nla_put_be32(skb, NFTA_FLOWTABLE_FLAGS, htonl(flowtable->data.flags)))
7199 goto nla_put_failure;
7201 nest = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK);
7203 goto nla_put_failure;
7204 if (nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_NUM, htonl(flowtable->hooknum)) ||
7205 nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_PRIORITY, htonl(flowtable->data.priority)))
7206 goto nla_put_failure;
7208 nest_devs = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK_DEVS);
7210 goto nla_put_failure;
7212 list_for_each_entry_rcu(hook, hook_list, list) {
7213 if (nla_put_string(skb, NFTA_DEVICE_NAME, hook->ops.dev->name))
7214 goto nla_put_failure;
7216 nla_nest_end(skb, nest_devs);
7217 nla_nest_end(skb, nest);
7219 nlmsg_end(skb, nlh);
7223 nlmsg_trim(skb, nlh);
7227 struct nft_flowtable_filter {
7231 static int nf_tables_dump_flowtable(struct sk_buff *skb,
7232 struct netlink_callback *cb)
7234 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
7235 struct nft_flowtable_filter *filter = cb->data;
7236 unsigned int idx = 0, s_idx = cb->args[0];
7237 struct net *net = sock_net(skb->sk);
7238 int family = nfmsg->nfgen_family;
7239 struct nft_flowtable *flowtable;
7240 const struct nft_table *table;
7243 cb->seq = net->nft.base_seq;
7245 list_for_each_entry_rcu(table, &net->nft.tables, list) {
7246 if (family != NFPROTO_UNSPEC && family != table->family)
7249 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
7250 if (!nft_is_active(net, flowtable))
7255 memset(&cb->args[1], 0,
7256 sizeof(cb->args) - sizeof(cb->args[0]));
7257 if (filter && filter->table &&
7258 strcmp(filter->table, table->name))
7261 if (nf_tables_fill_flowtable_info(skb, net, NETLINK_CB(cb->skb).portid,
7263 NFT_MSG_NEWFLOWTABLE,
7264 NLM_F_MULTI | NLM_F_APPEND,
7267 &flowtable->hook_list) < 0)
7270 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7282 static int nf_tables_dump_flowtable_start(struct netlink_callback *cb)
7284 const struct nlattr * const *nla = cb->data;
7285 struct nft_flowtable_filter *filter = NULL;
7287 if (nla[NFTA_FLOWTABLE_TABLE]) {
7288 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
7292 filter->table = nla_strdup(nla[NFTA_FLOWTABLE_TABLE],
7294 if (!filter->table) {
7304 static int nf_tables_dump_flowtable_done(struct netlink_callback *cb)
7306 struct nft_flowtable_filter *filter = cb->data;
7311 kfree(filter->table);
7317 /* called with rcu_read_lock held */
7318 static int nf_tables_getflowtable(struct net *net, struct sock *nlsk,
7319 struct sk_buff *skb,
7320 const struct nlmsghdr *nlh,
7321 const struct nlattr * const nla[],
7322 struct netlink_ext_ack *extack)
7324 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
7325 u8 genmask = nft_genmask_cur(net);
7326 int family = nfmsg->nfgen_family;
7327 struct nft_flowtable *flowtable;
7328 const struct nft_table *table;
7329 struct sk_buff *skb2;
7332 if (nlh->nlmsg_flags & NLM_F_DUMP) {
7333 struct netlink_dump_control c = {
7334 .start = nf_tables_dump_flowtable_start,
7335 .dump = nf_tables_dump_flowtable,
7336 .done = nf_tables_dump_flowtable_done,
7337 .module = THIS_MODULE,
7338 .data = (void *)nla,
7341 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
7344 if (!nla[NFTA_FLOWTABLE_NAME])
7347 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
7350 return PTR_ERR(table);
7352 flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
7354 if (IS_ERR(flowtable))
7355 return PTR_ERR(flowtable);
7357 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
7361 err = nf_tables_fill_flowtable_info(skb2, net, NETLINK_CB(skb).portid,
7363 NFT_MSG_NEWFLOWTABLE, 0, family,
7364 flowtable, &flowtable->hook_list);
7366 goto err_fill_flowtable_info;
7368 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
7370 err_fill_flowtable_info:
7375 static void nf_tables_flowtable_notify(struct nft_ctx *ctx,
7376 struct nft_flowtable *flowtable,
7377 struct list_head *hook_list,
7380 struct sk_buff *skb;
7382 char *buf = kasprintf(GFP_KERNEL, "%s:%llu;%s:%llu",
7383 flowtable->table->name, flowtable->table->handle,
7384 flowtable->name, flowtable->handle);
7386 audit_log_nfcfg(buf,
7389 event == NFT_MSG_NEWFLOWTABLE ?
7390 AUDIT_NFT_OP_FLOWTABLE_REGISTER :
7391 AUDIT_NFT_OP_FLOWTABLE_UNREGISTER,
7396 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
7399 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
7403 err = nf_tables_fill_flowtable_info(skb, ctx->net, ctx->portid,
7405 ctx->family, flowtable, hook_list);
7411 nft_notify_enqueue(skb, ctx->report, &ctx->net->nft.notify_list);
7414 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
7417 static void nf_tables_flowtable_destroy(struct nft_flowtable *flowtable)
7419 struct nft_hook *hook, *next;
7421 flowtable->data.type->free(&flowtable->data);
7422 list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
7423 flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
7425 list_del_rcu(&hook->list);
7428 kfree(flowtable->name);
7429 module_put(flowtable->data.type->owner);
7433 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
7434 u32 portid, u32 seq)
7436 struct nlmsghdr *nlh;
7437 struct nfgenmsg *nfmsg;
7438 char buf[TASK_COMM_LEN];
7439 int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN);
7441 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), 0);
7443 goto nla_put_failure;
7445 nfmsg = nlmsg_data(nlh);
7446 nfmsg->nfgen_family = AF_UNSPEC;
7447 nfmsg->version = NFNETLINK_V0;
7448 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
7450 if (nla_put_be32(skb, NFTA_GEN_ID, htonl(net->nft.base_seq)) ||
7451 nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) ||
7452 nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current)))
7453 goto nla_put_failure;
7455 nlmsg_end(skb, nlh);
7459 nlmsg_trim(skb, nlh);
7463 static void nft_flowtable_event(unsigned long event, struct net_device *dev,
7464 struct nft_flowtable *flowtable)
7466 struct nft_hook *hook;
7468 list_for_each_entry(hook, &flowtable->hook_list, list) {
7469 if (hook->ops.dev != dev)
7472 /* flow_offload_netdev_event() cleans up entries for us. */
7473 nft_unregister_flowtable_hook(dev_net(dev), flowtable, hook);
7474 list_del_rcu(&hook->list);
7475 kfree_rcu(hook, rcu);
7480 static int nf_tables_flowtable_event(struct notifier_block *this,
7481 unsigned long event, void *ptr)
7483 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
7484 struct nft_flowtable *flowtable;
7485 struct nft_table *table;
7488 if (event != NETDEV_UNREGISTER)
7492 mutex_lock(&net->nft.commit_mutex);
7493 list_for_each_entry(table, &net->nft.tables, list) {
7494 list_for_each_entry(flowtable, &table->flowtables, list) {
7495 nft_flowtable_event(event, dev, flowtable);
7498 mutex_unlock(&net->nft.commit_mutex);
7503 static struct notifier_block nf_tables_flowtable_notifier = {
7504 .notifier_call = nf_tables_flowtable_event,
7507 static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
7510 struct nlmsghdr *nlh = nlmsg_hdr(skb);
7511 struct sk_buff *skb2;
7514 audit_log_nfcfg("?:0;?:0", 0, net->nft.base_seq,
7515 AUDIT_NFT_OP_GEN_REGISTER, GFP_KERNEL);
7517 if (!nlmsg_report(nlh) &&
7518 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
7521 skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
7525 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
7532 nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
7533 nlmsg_report(nlh), GFP_KERNEL);
7536 nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
7540 static int nf_tables_getgen(struct net *net, struct sock *nlsk,
7541 struct sk_buff *skb, const struct nlmsghdr *nlh,
7542 const struct nlattr * const nla[],
7543 struct netlink_ext_ack *extack)
7545 struct sk_buff *skb2;
7548 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
7552 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
7555 goto err_fill_gen_info;
7557 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
7564 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
7565 [NFT_MSG_NEWTABLE] = {
7566 .call_batch = nf_tables_newtable,
7567 .attr_count = NFTA_TABLE_MAX,
7568 .policy = nft_table_policy,
7570 [NFT_MSG_GETTABLE] = {
7571 .call_rcu = nf_tables_gettable,
7572 .attr_count = NFTA_TABLE_MAX,
7573 .policy = nft_table_policy,
7575 [NFT_MSG_DELTABLE] = {
7576 .call_batch = nf_tables_deltable,
7577 .attr_count = NFTA_TABLE_MAX,
7578 .policy = nft_table_policy,
7580 [NFT_MSG_NEWCHAIN] = {
7581 .call_batch = nf_tables_newchain,
7582 .attr_count = NFTA_CHAIN_MAX,
7583 .policy = nft_chain_policy,
7585 [NFT_MSG_GETCHAIN] = {
7586 .call_rcu = nf_tables_getchain,
7587 .attr_count = NFTA_CHAIN_MAX,
7588 .policy = nft_chain_policy,
7590 [NFT_MSG_DELCHAIN] = {
7591 .call_batch = nf_tables_delchain,
7592 .attr_count = NFTA_CHAIN_MAX,
7593 .policy = nft_chain_policy,
7595 [NFT_MSG_NEWRULE] = {
7596 .call_batch = nf_tables_newrule,
7597 .attr_count = NFTA_RULE_MAX,
7598 .policy = nft_rule_policy,
7600 [NFT_MSG_GETRULE] = {
7601 .call_rcu = nf_tables_getrule,
7602 .attr_count = NFTA_RULE_MAX,
7603 .policy = nft_rule_policy,
7605 [NFT_MSG_DELRULE] = {
7606 .call_batch = nf_tables_delrule,
7607 .attr_count = NFTA_RULE_MAX,
7608 .policy = nft_rule_policy,
7610 [NFT_MSG_NEWSET] = {
7611 .call_batch = nf_tables_newset,
7612 .attr_count = NFTA_SET_MAX,
7613 .policy = nft_set_policy,
7615 [NFT_MSG_GETSET] = {
7616 .call_rcu = nf_tables_getset,
7617 .attr_count = NFTA_SET_MAX,
7618 .policy = nft_set_policy,
7620 [NFT_MSG_DELSET] = {
7621 .call_batch = nf_tables_delset,
7622 .attr_count = NFTA_SET_MAX,
7623 .policy = nft_set_policy,
7625 [NFT_MSG_NEWSETELEM] = {
7626 .call_batch = nf_tables_newsetelem,
7627 .attr_count = NFTA_SET_ELEM_LIST_MAX,
7628 .policy = nft_set_elem_list_policy,
7630 [NFT_MSG_GETSETELEM] = {
7631 .call_rcu = nf_tables_getsetelem,
7632 .attr_count = NFTA_SET_ELEM_LIST_MAX,
7633 .policy = nft_set_elem_list_policy,
7635 [NFT_MSG_DELSETELEM] = {
7636 .call_batch = nf_tables_delsetelem,
7637 .attr_count = NFTA_SET_ELEM_LIST_MAX,
7638 .policy = nft_set_elem_list_policy,
7640 [NFT_MSG_GETGEN] = {
7641 .call_rcu = nf_tables_getgen,
7643 [NFT_MSG_NEWOBJ] = {
7644 .call_batch = nf_tables_newobj,
7645 .attr_count = NFTA_OBJ_MAX,
7646 .policy = nft_obj_policy,
7648 [NFT_MSG_GETOBJ] = {
7649 .call_rcu = nf_tables_getobj,
7650 .attr_count = NFTA_OBJ_MAX,
7651 .policy = nft_obj_policy,
7653 [NFT_MSG_DELOBJ] = {
7654 .call_batch = nf_tables_delobj,
7655 .attr_count = NFTA_OBJ_MAX,
7656 .policy = nft_obj_policy,
7658 [NFT_MSG_GETOBJ_RESET] = {
7659 .call_rcu = nf_tables_getobj,
7660 .attr_count = NFTA_OBJ_MAX,
7661 .policy = nft_obj_policy,
7663 [NFT_MSG_NEWFLOWTABLE] = {
7664 .call_batch = nf_tables_newflowtable,
7665 .attr_count = NFTA_FLOWTABLE_MAX,
7666 .policy = nft_flowtable_policy,
7668 [NFT_MSG_GETFLOWTABLE] = {
7669 .call_rcu = nf_tables_getflowtable,
7670 .attr_count = NFTA_FLOWTABLE_MAX,
7671 .policy = nft_flowtable_policy,
7673 [NFT_MSG_DELFLOWTABLE] = {
7674 .call_batch = nf_tables_delflowtable,
7675 .attr_count = NFTA_FLOWTABLE_MAX,
7676 .policy = nft_flowtable_policy,
7680 static int nf_tables_validate(struct net *net)
7682 struct nft_table *table;
7684 switch (net->nft.validate_state) {
7685 case NFT_VALIDATE_SKIP:
7687 case NFT_VALIDATE_NEED:
7688 nft_validate_state_update(net, NFT_VALIDATE_DO);
7690 case NFT_VALIDATE_DO:
7691 list_for_each_entry(table, &net->nft.tables, list) {
7692 if (nft_table_validate(net, table) < 0)
7701 /* a drop policy has to be deferred until all rules have been activated,
7702 * otherwise a large ruleset that contains a drop-policy base chain will
7703 * cause all packets to get dropped until the full transaction has been
7706 * We defer the drop policy until the transaction has been finalized.
7708 static void nft_chain_commit_drop_policy(struct nft_trans *trans)
7710 struct nft_base_chain *basechain;
7712 if (nft_trans_chain_policy(trans) != NF_DROP)
7715 if (!nft_is_base_chain(trans->ctx.chain))
7718 basechain = nft_base_chain(trans->ctx.chain);
7719 basechain->policy = NF_DROP;
7722 static void nft_chain_commit_update(struct nft_trans *trans)
7724 struct nft_base_chain *basechain;
7726 if (nft_trans_chain_name(trans)) {
7727 rhltable_remove(&trans->ctx.table->chains_ht,
7728 &trans->ctx.chain->rhlhead,
7729 nft_chain_ht_params);
7730 swap(trans->ctx.chain->name, nft_trans_chain_name(trans));
7731 rhltable_insert_key(&trans->ctx.table->chains_ht,
7732 trans->ctx.chain->name,
7733 &trans->ctx.chain->rhlhead,
7734 nft_chain_ht_params);
7737 if (!nft_is_base_chain(trans->ctx.chain))
7740 nft_chain_stats_replace(trans);
7742 basechain = nft_base_chain(trans->ctx.chain);
7744 switch (nft_trans_chain_policy(trans)) {
7747 basechain->policy = nft_trans_chain_policy(trans);
7752 static void nft_obj_commit_update(struct nft_trans *trans)
7754 struct nft_object *newobj;
7755 struct nft_object *obj;
7757 obj = nft_trans_obj(trans);
7758 newobj = nft_trans_obj_newobj(trans);
7760 if (obj->ops->update)
7761 obj->ops->update(obj, newobj);
7766 static void nft_commit_release(struct nft_trans *trans)
7768 switch (trans->msg_type) {
7769 case NFT_MSG_DELTABLE:
7770 nf_tables_table_destroy(&trans->ctx);
7772 case NFT_MSG_NEWCHAIN:
7773 free_percpu(nft_trans_chain_stats(trans));
7774 kfree(nft_trans_chain_name(trans));
7776 case NFT_MSG_DELCHAIN:
7777 nf_tables_chain_destroy(&trans->ctx);
7779 case NFT_MSG_DELRULE:
7780 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
7782 case NFT_MSG_DELSET:
7783 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
7785 case NFT_MSG_DELSETELEM:
7786 nf_tables_set_elem_destroy(&trans->ctx,
7787 nft_trans_elem_set(trans),
7788 nft_trans_elem(trans).priv);
7790 case NFT_MSG_DELOBJ:
7791 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
7793 case NFT_MSG_DELFLOWTABLE:
7794 if (nft_trans_flowtable_update(trans))
7795 nft_flowtable_hooks_destroy(&nft_trans_flowtable_hooks(trans));
7797 nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
7802 put_net(trans->ctx.net);
7807 static void nf_tables_trans_destroy_work(struct work_struct *w)
7809 struct nft_trans *trans, *next;
7812 spin_lock(&nf_tables_destroy_list_lock);
7813 list_splice_init(&nf_tables_destroy_list, &head);
7814 spin_unlock(&nf_tables_destroy_list_lock);
7816 if (list_empty(&head))
7821 list_for_each_entry_safe(trans, next, &head, list) {
7822 list_del(&trans->list);
7823 nft_commit_release(trans);
7827 void nf_tables_trans_destroy_flush_work(void)
7829 flush_work(&trans_destroy_work);
7831 EXPORT_SYMBOL_GPL(nf_tables_trans_destroy_flush_work);
7833 static int nf_tables_commit_chain_prepare(struct net *net, struct nft_chain *chain)
7835 struct nft_rule *rule;
7836 unsigned int alloc = 0;
7839 /* already handled or inactive chain? */
7840 if (chain->rules_next || !nft_is_active_next(net, chain))
7843 rule = list_entry(&chain->rules, struct nft_rule, list);
7846 list_for_each_entry_continue(rule, &chain->rules, list) {
7847 if (nft_is_active_next(net, rule))
7851 chain->rules_next = nf_tables_chain_alloc_rules(chain, alloc);
7852 if (!chain->rules_next)
7855 list_for_each_entry_continue(rule, &chain->rules, list) {
7856 if (nft_is_active_next(net, rule))
7857 chain->rules_next[i++] = rule;
7860 chain->rules_next[i] = NULL;
7864 static void nf_tables_commit_chain_prepare_cancel(struct net *net)
7866 struct nft_trans *trans, *next;
7868 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
7869 struct nft_chain *chain = trans->ctx.chain;
7871 if (trans->msg_type == NFT_MSG_NEWRULE ||
7872 trans->msg_type == NFT_MSG_DELRULE) {
7873 kvfree(chain->rules_next);
7874 chain->rules_next = NULL;
7879 static void __nf_tables_commit_chain_free_rules_old(struct rcu_head *h)
7881 struct nft_rules_old *o = container_of(h, struct nft_rules_old, h);
7886 static void nf_tables_commit_chain_free_rules_old(struct nft_rule **rules)
7888 struct nft_rule **r = rules;
7889 struct nft_rules_old *old;
7894 r++; /* rcu_head is after end marker */
7898 call_rcu(&old->h, __nf_tables_commit_chain_free_rules_old);
7901 static void nf_tables_commit_chain(struct net *net, struct nft_chain *chain)
7903 struct nft_rule **g0, **g1;
7906 next_genbit = nft_gencursor_next(net);
7908 g0 = rcu_dereference_protected(chain->rules_gen_0,
7909 lockdep_commit_lock_is_held(net));
7910 g1 = rcu_dereference_protected(chain->rules_gen_1,
7911 lockdep_commit_lock_is_held(net));
7913 /* No changes to this chain? */
7914 if (chain->rules_next == NULL) {
7915 /* chain had no change in last or next generation */
7919 * chain had no change in this generation; make sure next
7920 * one uses same rules as current generation.
7923 rcu_assign_pointer(chain->rules_gen_1, g0);
7924 nf_tables_commit_chain_free_rules_old(g1);
7926 rcu_assign_pointer(chain->rules_gen_0, g1);
7927 nf_tables_commit_chain_free_rules_old(g0);
7934 rcu_assign_pointer(chain->rules_gen_1, chain->rules_next);
7936 rcu_assign_pointer(chain->rules_gen_0, chain->rules_next);
7938 chain->rules_next = NULL;
7944 nf_tables_commit_chain_free_rules_old(g1);
7946 nf_tables_commit_chain_free_rules_old(g0);
7949 static void nft_obj_del(struct nft_object *obj)
7951 rhltable_remove(&nft_objname_ht, &obj->rhlhead, nft_objname_ht_params);
7952 list_del_rcu(&obj->list);
7955 void nft_chain_del(struct nft_chain *chain)
7957 struct nft_table *table = chain->table;
7959 WARN_ON_ONCE(rhltable_remove(&table->chains_ht, &chain->rhlhead,
7960 nft_chain_ht_params));
7961 list_del_rcu(&chain->list);
7964 static void nft_flowtable_hooks_del(struct nft_flowtable *flowtable,
7965 struct list_head *hook_list)
7967 struct nft_hook *hook, *next;
7969 list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
7971 list_move(&hook->list, hook_list);
7975 static void nf_tables_module_autoload_cleanup(struct net *net)
7977 struct nft_module_request *req, *next;
7979 WARN_ON_ONCE(!list_empty(&net->nft.commit_list));
7980 list_for_each_entry_safe(req, next, &net->nft.module_list, list) {
7981 WARN_ON_ONCE(!req->done);
7982 list_del(&req->list);
7987 static void nf_tables_commit_release(struct net *net)
7989 struct nft_trans *trans;
7991 /* all side effects have to be made visible.
7992 * For example, if a chain named 'foo' has been deleted, a
7993 * new transaction must not find it anymore.
7995 * Memory reclaim happens asynchronously from work queue
7996 * to prevent expensive synchronize_rcu() in commit phase.
7998 if (list_empty(&net->nft.commit_list)) {
7999 nf_tables_module_autoload_cleanup(net);
8000 mutex_unlock(&net->nft.commit_mutex);
8004 trans = list_last_entry(&net->nft.commit_list,
8005 struct nft_trans, list);
8006 get_net(trans->ctx.net);
8007 WARN_ON_ONCE(trans->put_net);
8009 trans->put_net = true;
8010 spin_lock(&nf_tables_destroy_list_lock);
8011 list_splice_tail_init(&net->nft.commit_list, &nf_tables_destroy_list);
8012 spin_unlock(&nf_tables_destroy_list_lock);
8014 nf_tables_module_autoload_cleanup(net);
8015 schedule_work(&trans_destroy_work);
8017 mutex_unlock(&net->nft.commit_mutex);
8020 static void nft_commit_notify(struct net *net, u32 portid)
8022 struct sk_buff *batch_skb = NULL, *nskb, *skb;
8023 unsigned char *data;
8026 list_for_each_entry_safe(skb, nskb, &net->nft.notify_list, list) {
8030 len = NLMSG_GOODSIZE - skb->len;
8031 list_del(&skb->list);
8035 if (len > 0 && NFT_CB(skb).report == NFT_CB(batch_skb).report) {
8036 data = skb_put(batch_skb, skb->len);
8037 memcpy(data, skb->data, skb->len);
8038 list_del(&skb->list);
8042 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
8043 NFT_CB(batch_skb).report, GFP_KERNEL);
8048 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
8049 NFT_CB(batch_skb).report, GFP_KERNEL);
8052 WARN_ON_ONCE(!list_empty(&net->nft.notify_list));
8055 static int nf_tables_commit(struct net *net, struct sk_buff *skb)
8057 struct nft_trans *trans, *next;
8058 struct nft_trans_elem *te;
8059 struct nft_chain *chain;
8060 struct nft_table *table;
8063 if (list_empty(&net->nft.commit_list)) {
8064 mutex_unlock(&net->nft.commit_mutex);
8068 /* 0. Validate ruleset, otherwise roll back for error reporting. */
8069 if (nf_tables_validate(net) < 0)
8072 err = nft_flow_rule_offload_commit(net);
8076 /* 1. Allocate space for next generation rules_gen_X[] */
8077 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
8080 if (trans->msg_type == NFT_MSG_NEWRULE ||
8081 trans->msg_type == NFT_MSG_DELRULE) {
8082 chain = trans->ctx.chain;
8084 ret = nf_tables_commit_chain_prepare(net, chain);
8086 nf_tables_commit_chain_prepare_cancel(net);
8092 /* step 2. Make rules_gen_X visible to packet path */
8093 list_for_each_entry(table, &net->nft.tables, list) {
8094 list_for_each_entry(chain, &table->chains, list)
8095 nf_tables_commit_chain(net, chain);
8099 * Bump generation counter, invalidate any dump in progress.
8100 * Cannot fail after this point.
8102 while (++net->nft.base_seq == 0);
8104 /* step 3. Start new generation, rules_gen_X now in use. */
8105 net->nft.gencursor = nft_gencursor_next(net);
8107 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
8108 switch (trans->msg_type) {
8109 case NFT_MSG_NEWTABLE:
8110 if (nft_trans_table_update(trans)) {
8111 if (!nft_trans_table_enable(trans)) {
8112 nf_tables_table_disable(net,
8114 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
8117 nft_clear(net, trans->ctx.table);
8119 nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
8120 nft_trans_destroy(trans);
8122 case NFT_MSG_DELTABLE:
8123 list_del_rcu(&trans->ctx.table->list);
8124 nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE);
8126 case NFT_MSG_NEWCHAIN:
8127 if (nft_trans_chain_update(trans)) {
8128 nft_chain_commit_update(trans);
8129 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
8130 /* trans destroyed after rcu grace period */
8132 nft_chain_commit_drop_policy(trans);
8133 nft_clear(net, trans->ctx.chain);
8134 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
8135 nft_trans_destroy(trans);
8138 case NFT_MSG_DELCHAIN:
8139 nft_chain_del(trans->ctx.chain);
8140 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN);
8141 nf_tables_unregister_hook(trans->ctx.net,
8145 case NFT_MSG_NEWRULE:
8146 nft_clear(trans->ctx.net, nft_trans_rule(trans));
8147 nf_tables_rule_notify(&trans->ctx,
8148 nft_trans_rule(trans),
8150 nft_trans_destroy(trans);
8152 case NFT_MSG_DELRULE:
8153 list_del_rcu(&nft_trans_rule(trans)->list);
8154 nf_tables_rule_notify(&trans->ctx,
8155 nft_trans_rule(trans),
8157 nft_rule_expr_deactivate(&trans->ctx,
8158 nft_trans_rule(trans),
8161 case NFT_MSG_NEWSET:
8162 nft_clear(net, nft_trans_set(trans));
8163 /* This avoids hitting -EBUSY when deleting the table
8164 * from the transaction.
8166 if (nft_set_is_anonymous(nft_trans_set(trans)) &&
8167 !list_empty(&nft_trans_set(trans)->bindings))
8168 trans->ctx.table->use--;
8170 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
8171 NFT_MSG_NEWSET, GFP_KERNEL);
8172 nft_trans_destroy(trans);
8174 case NFT_MSG_DELSET:
8175 list_del_rcu(&nft_trans_set(trans)->list);
8176 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
8177 NFT_MSG_DELSET, GFP_KERNEL);
8179 case NFT_MSG_NEWSETELEM:
8180 te = (struct nft_trans_elem *)trans->data;
8182 te->set->ops->activate(net, te->set, &te->elem);
8183 nf_tables_setelem_notify(&trans->ctx, te->set,
8185 NFT_MSG_NEWSETELEM, 0);
8186 nft_trans_destroy(trans);
8188 case NFT_MSG_DELSETELEM:
8189 te = (struct nft_trans_elem *)trans->data;
8191 nf_tables_setelem_notify(&trans->ctx, te->set,
8193 NFT_MSG_DELSETELEM, 0);
8194 te->set->ops->remove(net, te->set, &te->elem);
8195 atomic_dec(&te->set->nelems);
8198 case NFT_MSG_NEWOBJ:
8199 if (nft_trans_obj_update(trans)) {
8200 nft_obj_commit_update(trans);
8201 nf_tables_obj_notify(&trans->ctx,
8202 nft_trans_obj(trans),
8205 nft_clear(net, nft_trans_obj(trans));
8206 nf_tables_obj_notify(&trans->ctx,
8207 nft_trans_obj(trans),
8209 nft_trans_destroy(trans);
8212 case NFT_MSG_DELOBJ:
8213 nft_obj_del(nft_trans_obj(trans));
8214 nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
8217 case NFT_MSG_NEWFLOWTABLE:
8218 if (nft_trans_flowtable_update(trans)) {
8219 nft_trans_flowtable(trans)->data.flags =
8220 nft_trans_flowtable_flags(trans);
8221 nf_tables_flowtable_notify(&trans->ctx,
8222 nft_trans_flowtable(trans),
8223 &nft_trans_flowtable_hooks(trans),
8224 NFT_MSG_NEWFLOWTABLE);
8225 list_splice(&nft_trans_flowtable_hooks(trans),
8226 &nft_trans_flowtable(trans)->hook_list);
8228 nft_clear(net, nft_trans_flowtable(trans));
8229 nf_tables_flowtable_notify(&trans->ctx,
8230 nft_trans_flowtable(trans),
8231 &nft_trans_flowtable(trans)->hook_list,
8232 NFT_MSG_NEWFLOWTABLE);
8234 nft_trans_destroy(trans);
8236 case NFT_MSG_DELFLOWTABLE:
8237 if (nft_trans_flowtable_update(trans)) {
8238 nft_flowtable_hooks_del(nft_trans_flowtable(trans),
8239 &nft_trans_flowtable_hooks(trans));
8240 nf_tables_flowtable_notify(&trans->ctx,
8241 nft_trans_flowtable(trans),
8242 &nft_trans_flowtable_hooks(trans),
8243 NFT_MSG_DELFLOWTABLE);
8244 nft_unregister_flowtable_net_hooks(net,
8245 &nft_trans_flowtable_hooks(trans));
8247 list_del_rcu(&nft_trans_flowtable(trans)->list);
8248 nf_tables_flowtable_notify(&trans->ctx,
8249 nft_trans_flowtable(trans),
8250 &nft_trans_flowtable(trans)->hook_list,
8251 NFT_MSG_DELFLOWTABLE);
8252 nft_unregister_flowtable_net_hooks(net,
8253 &nft_trans_flowtable(trans)->hook_list);
8259 nft_commit_notify(net, NETLINK_CB(skb).portid);
8260 nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
8261 nf_tables_commit_release(net);
8266 static void nf_tables_module_autoload(struct net *net)
8268 struct nft_module_request *req, *next;
8269 LIST_HEAD(module_list);
8271 list_splice_init(&net->nft.module_list, &module_list);
8272 mutex_unlock(&net->nft.commit_mutex);
8273 list_for_each_entry_safe(req, next, &module_list, list) {
8274 request_module("%s", req->module);
8277 mutex_lock(&net->nft.commit_mutex);
8278 list_splice(&module_list, &net->nft.module_list);
8281 static void nf_tables_abort_release(struct nft_trans *trans)
8283 switch (trans->msg_type) {
8284 case NFT_MSG_NEWTABLE:
8285 nf_tables_table_destroy(&trans->ctx);
8287 case NFT_MSG_NEWCHAIN:
8288 nf_tables_chain_destroy(&trans->ctx);
8290 case NFT_MSG_NEWRULE:
8291 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
8293 case NFT_MSG_NEWSET:
8294 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
8296 case NFT_MSG_NEWSETELEM:
8297 nft_set_elem_destroy(nft_trans_elem_set(trans),
8298 nft_trans_elem(trans).priv, true);
8300 case NFT_MSG_NEWOBJ:
8301 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
8303 case NFT_MSG_NEWFLOWTABLE:
8304 if (nft_trans_flowtable_update(trans))
8305 nft_flowtable_hooks_destroy(&nft_trans_flowtable_hooks(trans));
8307 nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
8313 static int __nf_tables_abort(struct net *net, enum nfnl_abort_action action)
8315 struct nft_trans *trans, *next;
8316 struct nft_trans_elem *te;
8317 struct nft_hook *hook;
8319 if (action == NFNL_ABORT_VALIDATE &&
8320 nf_tables_validate(net) < 0)
8323 list_for_each_entry_safe_reverse(trans, next, &net->nft.commit_list,
8325 switch (trans->msg_type) {
8326 case NFT_MSG_NEWTABLE:
8327 if (nft_trans_table_update(trans)) {
8328 if (nft_trans_table_enable(trans)) {
8329 nf_tables_table_disable(net,
8331 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
8333 nft_trans_destroy(trans);
8335 list_del_rcu(&trans->ctx.table->list);
8338 case NFT_MSG_DELTABLE:
8339 nft_clear(trans->ctx.net, trans->ctx.table);
8340 nft_trans_destroy(trans);
8342 case NFT_MSG_NEWCHAIN:
8343 if (nft_trans_chain_update(trans)) {
8344 free_percpu(nft_trans_chain_stats(trans));
8345 kfree(nft_trans_chain_name(trans));
8346 nft_trans_destroy(trans);
8348 if (nft_chain_is_bound(trans->ctx.chain)) {
8349 nft_trans_destroy(trans);
8352 trans->ctx.table->use--;
8353 nft_chain_del(trans->ctx.chain);
8354 nf_tables_unregister_hook(trans->ctx.net,
8359 case NFT_MSG_DELCHAIN:
8360 trans->ctx.table->use++;
8361 nft_clear(trans->ctx.net, trans->ctx.chain);
8362 nft_trans_destroy(trans);
8364 case NFT_MSG_NEWRULE:
8365 trans->ctx.chain->use--;
8366 list_del_rcu(&nft_trans_rule(trans)->list);
8367 nft_rule_expr_deactivate(&trans->ctx,
8368 nft_trans_rule(trans),
8371 case NFT_MSG_DELRULE:
8372 trans->ctx.chain->use++;
8373 nft_clear(trans->ctx.net, nft_trans_rule(trans));
8374 nft_rule_expr_activate(&trans->ctx, nft_trans_rule(trans));
8375 nft_trans_destroy(trans);
8377 case NFT_MSG_NEWSET:
8378 trans->ctx.table->use--;
8379 if (nft_trans_set_bound(trans)) {
8380 nft_trans_destroy(trans);
8383 list_del_rcu(&nft_trans_set(trans)->list);
8385 case NFT_MSG_DELSET:
8386 trans->ctx.table->use++;
8387 nft_clear(trans->ctx.net, nft_trans_set(trans));
8388 nft_trans_destroy(trans);
8390 case NFT_MSG_NEWSETELEM:
8391 if (nft_trans_elem_set_bound(trans)) {
8392 nft_trans_destroy(trans);
8395 te = (struct nft_trans_elem *)trans->data;
8396 te->set->ops->remove(net, te->set, &te->elem);
8397 atomic_dec(&te->set->nelems);
8399 case NFT_MSG_DELSETELEM:
8400 te = (struct nft_trans_elem *)trans->data;
8402 nft_set_elem_activate(net, te->set, &te->elem);
8403 te->set->ops->activate(net, te->set, &te->elem);
8406 nft_trans_destroy(trans);
8408 case NFT_MSG_NEWOBJ:
8409 if (nft_trans_obj_update(trans)) {
8410 kfree(nft_trans_obj_newobj(trans));
8411 nft_trans_destroy(trans);
8413 trans->ctx.table->use--;
8414 nft_obj_del(nft_trans_obj(trans));
8417 case NFT_MSG_DELOBJ:
8418 trans->ctx.table->use++;
8419 nft_clear(trans->ctx.net, nft_trans_obj(trans));
8420 nft_trans_destroy(trans);
8422 case NFT_MSG_NEWFLOWTABLE:
8423 if (nft_trans_flowtable_update(trans)) {
8424 nft_unregister_flowtable_net_hooks(net,
8425 &nft_trans_flowtable_hooks(trans));
8427 trans->ctx.table->use--;
8428 list_del_rcu(&nft_trans_flowtable(trans)->list);
8429 nft_unregister_flowtable_net_hooks(net,
8430 &nft_trans_flowtable(trans)->hook_list);
8433 case NFT_MSG_DELFLOWTABLE:
8434 if (nft_trans_flowtable_update(trans)) {
8435 list_for_each_entry(hook, &nft_trans_flowtable(trans)->hook_list, list)
8436 hook->inactive = false;
8438 trans->ctx.table->use++;
8439 nft_clear(trans->ctx.net, nft_trans_flowtable(trans));
8441 nft_trans_destroy(trans);
8448 list_for_each_entry_safe_reverse(trans, next,
8449 &net->nft.commit_list, list) {
8450 list_del(&trans->list);
8451 nf_tables_abort_release(trans);
8454 if (action == NFNL_ABORT_AUTOLOAD)
8455 nf_tables_module_autoload(net);
8457 nf_tables_module_autoload_cleanup(net);
8462 static void nf_tables_cleanup(struct net *net)
8464 nft_validate_state_update(net, NFT_VALIDATE_SKIP);
8467 static int nf_tables_abort(struct net *net, struct sk_buff *skb,
8468 enum nfnl_abort_action action)
8470 int ret = __nf_tables_abort(net, action);
8472 mutex_unlock(&net->nft.commit_mutex);
8477 static bool nf_tables_valid_genid(struct net *net, u32 genid)
8481 mutex_lock(&net->nft.commit_mutex);
8483 genid_ok = genid == 0 || net->nft.base_seq == genid;
8485 mutex_unlock(&net->nft.commit_mutex);
8487 /* else, commit mutex has to be released by commit or abort function */
8491 static const struct nfnetlink_subsystem nf_tables_subsys = {
8492 .name = "nf_tables",
8493 .subsys_id = NFNL_SUBSYS_NFTABLES,
8494 .cb_count = NFT_MSG_MAX,
8496 .commit = nf_tables_commit,
8497 .abort = nf_tables_abort,
8498 .cleanup = nf_tables_cleanup,
8499 .valid_genid = nf_tables_valid_genid,
8500 .owner = THIS_MODULE,
8503 int nft_chain_validate_dependency(const struct nft_chain *chain,
8504 enum nft_chain_types type)
8506 const struct nft_base_chain *basechain;
8508 if (nft_is_base_chain(chain)) {
8509 basechain = nft_base_chain(chain);
8510 if (basechain->type->type != type)
8515 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
8517 int nft_chain_validate_hooks(const struct nft_chain *chain,
8518 unsigned int hook_flags)
8520 struct nft_base_chain *basechain;
8522 if (nft_is_base_chain(chain)) {
8523 basechain = nft_base_chain(chain);
8525 if ((1 << basechain->ops.hooknum) & hook_flags)
8533 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
8536 * Loop detection - walk through the ruleset beginning at the destination chain
8537 * of a new jump until either the source chain is reached (loop) or all
8538 * reachable chains have been traversed.
8540 * The loop check is performed whenever a new jump verdict is added to an
8541 * expression or verdict map or a verdict map is bound to a new chain.
8544 static int nf_tables_check_loops(const struct nft_ctx *ctx,
8545 const struct nft_chain *chain);
8547 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
8548 struct nft_set *set,
8549 const struct nft_set_iter *iter,
8550 struct nft_set_elem *elem)
8552 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
8553 const struct nft_data *data;
8555 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
8556 *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
8559 data = nft_set_ext_data(ext);
8560 switch (data->verdict.code) {
8563 return nf_tables_check_loops(ctx, data->verdict.chain);
8569 static int nf_tables_check_loops(const struct nft_ctx *ctx,
8570 const struct nft_chain *chain)
8572 const struct nft_rule *rule;
8573 const struct nft_expr *expr, *last;
8574 struct nft_set *set;
8575 struct nft_set_binding *binding;
8576 struct nft_set_iter iter;
8578 if (ctx->chain == chain)
8581 list_for_each_entry(rule, &chain->rules, list) {
8582 nft_rule_for_each_expr(expr, last, rule) {
8583 struct nft_immediate_expr *priv;
8584 const struct nft_data *data;
8587 if (strcmp(expr->ops->type->name, "immediate"))
8590 priv = nft_expr_priv(expr);
8591 if (priv->dreg != NFT_REG_VERDICT)
8595 switch (data->verdict.code) {
8598 err = nf_tables_check_loops(ctx,
8599 data->verdict.chain);
8608 list_for_each_entry(set, &ctx->table->sets, list) {
8609 if (!nft_is_active_next(ctx->net, set))
8611 if (!(set->flags & NFT_SET_MAP) ||
8612 set->dtype != NFT_DATA_VERDICT)
8615 list_for_each_entry(binding, &set->bindings, list) {
8616 if (!(binding->flags & NFT_SET_MAP) ||
8617 binding->chain != chain)
8620 iter.genmask = nft_genmask_next(ctx->net);
8624 iter.fn = nf_tables_loop_check_setelem;
8626 set->ops->walk(ctx, set, &iter);
8636 * nft_parse_u32_check - fetch u32 attribute and check for maximum value
8638 * @attr: netlink attribute to fetch value from
8639 * @max: maximum value to be stored in dest
8640 * @dest: pointer to the variable
8642 * Parse, check and store a given u32 netlink attribute into variable.
8643 * This function returns -ERANGE if the value goes over maximum value.
8644 * Otherwise a 0 is returned and the attribute value is stored in the
8645 * destination variable.
8647 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
8651 val = ntohl(nla_get_be32(attr));
8658 EXPORT_SYMBOL_GPL(nft_parse_u32_check);
8661 * nft_parse_register - parse a register value from a netlink attribute
8663 * @attr: netlink attribute
8665 * Parse and translate a register value from a netlink attribute.
8666 * Registers used to be 128 bit wide, these register numbers will be
8667 * mapped to the corresponding 32 bit register numbers.
8669 static unsigned int nft_parse_register(const struct nlattr *attr)
8673 reg = ntohl(nla_get_be32(attr));
8675 case NFT_REG_VERDICT...NFT_REG_4:
8676 return reg * NFT_REG_SIZE / NFT_REG32_SIZE;
8678 return reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
8683 * nft_dump_register - dump a register value to a netlink attribute
8685 * @skb: socket buffer
8686 * @attr: attribute number
8687 * @reg: register number
8689 * Construct a netlink attribute containing the register number. For
8690 * compatibility reasons, register numbers being a multiple of 4 are
8691 * translated to the corresponding 128 bit register numbers.
8693 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
8695 if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
8696 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
8698 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
8700 return nla_put_be32(skb, attr, htonl(reg));
8702 EXPORT_SYMBOL_GPL(nft_dump_register);
8705 * nft_validate_register_load - validate a load from a register
8707 * @reg: the register number
8708 * @len: the length of the data
8710 * Validate that the input register is one of the general purpose
8711 * registers and that the length of the load is within the bounds.
8713 static int nft_validate_register_load(enum nft_registers reg, unsigned int len)
8715 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
8719 if (reg * NFT_REG32_SIZE + len > sizeof_field(struct nft_regs, data))
8725 int nft_parse_register_load(const struct nlattr *attr, u8 *sreg, u32 len)
8730 reg = nft_parse_register(attr);
8731 err = nft_validate_register_load(reg, len);
8738 EXPORT_SYMBOL_GPL(nft_parse_register_load);
8741 * nft_validate_register_store - validate an expressions' register store
8743 * @ctx: context of the expression performing the load
8744 * @reg: the destination register number
8745 * @data: the data to load
8746 * @type: the data type
8747 * @len: the length of the data
8749 * Validate that a data load uses the appropriate data type for
8750 * the destination register and the length is within the bounds.
8751 * A value of NULL for the data means that its runtime gathered
8754 static int nft_validate_register_store(const struct nft_ctx *ctx,
8755 enum nft_registers reg,
8756 const struct nft_data *data,
8757 enum nft_data_types type,
8763 case NFT_REG_VERDICT:
8764 if (type != NFT_DATA_VERDICT)
8768 (data->verdict.code == NFT_GOTO ||
8769 data->verdict.code == NFT_JUMP)) {
8770 err = nf_tables_check_loops(ctx, data->verdict.chain);
8777 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
8781 if (reg * NFT_REG32_SIZE + len >
8782 sizeof_field(struct nft_regs, data))
8785 if (data != NULL && type != NFT_DATA_VALUE)
8791 int nft_parse_register_store(const struct nft_ctx *ctx,
8792 const struct nlattr *attr, u8 *dreg,
8793 const struct nft_data *data,
8794 enum nft_data_types type, unsigned int len)
8799 reg = nft_parse_register(attr);
8800 err = nft_validate_register_store(ctx, reg, data, type, len);
8807 EXPORT_SYMBOL_GPL(nft_parse_register_store);
8809 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
8810 [NFTA_VERDICT_CODE] = { .type = NLA_U32 },
8811 [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING,
8812 .len = NFT_CHAIN_MAXNAMELEN - 1 },
8813 [NFTA_VERDICT_CHAIN_ID] = { .type = NLA_U32 },
8816 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
8817 struct nft_data_desc *desc, const struct nlattr *nla)
8819 u8 genmask = nft_genmask_next(ctx->net);
8820 struct nlattr *tb[NFTA_VERDICT_MAX + 1];
8821 struct nft_chain *chain;
8824 err = nla_parse_nested_deprecated(tb, NFTA_VERDICT_MAX, nla,
8825 nft_verdict_policy, NULL);
8829 if (!tb[NFTA_VERDICT_CODE])
8831 data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
8833 switch (data->verdict.code) {
8835 switch (data->verdict.code & NF_VERDICT_MASK) {
8850 if (tb[NFTA_VERDICT_CHAIN]) {
8851 chain = nft_chain_lookup(ctx->net, ctx->table,
8852 tb[NFTA_VERDICT_CHAIN],
8854 } else if (tb[NFTA_VERDICT_CHAIN_ID]) {
8855 chain = nft_chain_lookup_byid(ctx->net,
8856 tb[NFTA_VERDICT_CHAIN_ID]);
8858 return PTR_ERR(chain);
8864 return PTR_ERR(chain);
8865 if (nft_is_base_chain(chain))
8869 data->verdict.chain = chain;
8873 desc->len = sizeof(data->verdict);
8874 desc->type = NFT_DATA_VERDICT;
8878 static void nft_verdict_uninit(const struct nft_data *data)
8880 struct nft_chain *chain;
8881 struct nft_rule *rule;
8883 switch (data->verdict.code) {
8886 chain = data->verdict.chain;
8889 if (!nft_chain_is_bound(chain))
8892 chain->table->use--;
8893 list_for_each_entry(rule, &chain->rules, list)
8896 nft_chain_del(chain);
8901 int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
8903 struct nlattr *nest;
8905 nest = nla_nest_start_noflag(skb, type);
8907 goto nla_put_failure;
8909 if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
8910 goto nla_put_failure;
8915 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
8917 goto nla_put_failure;
8919 nla_nest_end(skb, nest);
8926 static int nft_value_init(const struct nft_ctx *ctx,
8927 struct nft_data *data, unsigned int size,
8928 struct nft_data_desc *desc, const struct nlattr *nla)
8938 nla_memcpy(data->data, nla, len);
8939 desc->type = NFT_DATA_VALUE;
8944 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
8947 return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
8950 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
8951 [NFTA_DATA_VALUE] = { .type = NLA_BINARY },
8952 [NFTA_DATA_VERDICT] = { .type = NLA_NESTED },
8956 * nft_data_init - parse nf_tables data netlink attributes
8958 * @ctx: context of the expression using the data
8959 * @data: destination struct nft_data
8960 * @size: maximum data length
8961 * @desc: data description
8962 * @nla: netlink attribute containing data
8964 * Parse the netlink data attributes and initialize a struct nft_data.
8965 * The type and length of data are returned in the data description.
8967 * The caller can indicate that it only wants to accept data of type
8968 * NFT_DATA_VALUE by passing NULL for the ctx argument.
8970 int nft_data_init(const struct nft_ctx *ctx,
8971 struct nft_data *data, unsigned int size,
8972 struct nft_data_desc *desc, const struct nlattr *nla)
8974 struct nlattr *tb[NFTA_DATA_MAX + 1];
8977 err = nla_parse_nested_deprecated(tb, NFTA_DATA_MAX, nla,
8978 nft_data_policy, NULL);
8982 if (tb[NFTA_DATA_VALUE])
8983 return nft_value_init(ctx, data, size, desc,
8984 tb[NFTA_DATA_VALUE]);
8985 if (tb[NFTA_DATA_VERDICT] && ctx != NULL)
8986 return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
8989 EXPORT_SYMBOL_GPL(nft_data_init);
8992 * nft_data_release - release a nft_data item
8994 * @data: struct nft_data to release
8995 * @type: type of data
8997 * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
8998 * all others need to be released by calling this function.
9000 void nft_data_release(const struct nft_data *data, enum nft_data_types type)
9002 if (type < NFT_DATA_VERDICT)
9005 case NFT_DATA_VERDICT:
9006 return nft_verdict_uninit(data);
9011 EXPORT_SYMBOL_GPL(nft_data_release);
9013 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
9014 enum nft_data_types type, unsigned int len)
9016 struct nlattr *nest;
9019 nest = nla_nest_start_noflag(skb, attr);
9024 case NFT_DATA_VALUE:
9025 err = nft_value_dump(skb, data, len);
9027 case NFT_DATA_VERDICT:
9028 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
9035 nla_nest_end(skb, nest);
9038 EXPORT_SYMBOL_GPL(nft_data_dump);
9040 int __nft_release_basechain(struct nft_ctx *ctx)
9042 struct nft_rule *rule, *nr;
9044 if (WARN_ON(!nft_is_base_chain(ctx->chain)))
9047 nf_tables_unregister_hook(ctx->net, ctx->chain->table, ctx->chain);
9048 list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
9049 list_del(&rule->list);
9051 nf_tables_rule_release(ctx, rule);
9053 nft_chain_del(ctx->chain);
9055 nf_tables_chain_destroy(ctx);
9059 EXPORT_SYMBOL_GPL(__nft_release_basechain);
9061 static void __nft_release_hook(struct net *net, struct nft_table *table)
9063 struct nft_chain *chain;
9065 list_for_each_entry(chain, &table->chains, list)
9066 nf_tables_unregister_hook(net, table, chain);
9069 static void __nft_release_hooks(struct net *net)
9071 struct nft_table *table;
9073 list_for_each_entry(table, &net->nft.tables, list) {
9074 if (nft_table_has_owner(table))
9077 __nft_release_hook(net, table);
9081 static void __nft_release_table(struct net *net, struct nft_table *table)
9083 struct nft_flowtable *flowtable, *nf;
9084 struct nft_chain *chain, *nc;
9085 struct nft_object *obj, *ne;
9086 struct nft_rule *rule, *nr;
9087 struct nft_set *set, *ns;
9088 struct nft_ctx ctx = {
9090 .family = NFPROTO_NETDEV,
9093 ctx.family = table->family;
9095 list_for_each_entry(chain, &table->chains, list) {
9097 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
9098 list_del(&rule->list);
9100 nf_tables_rule_release(&ctx, rule);
9103 list_for_each_entry_safe(flowtable, nf, &table->flowtables, list) {
9104 list_del(&flowtable->list);
9106 nf_tables_flowtable_destroy(flowtable);
9108 list_for_each_entry_safe(set, ns, &table->sets, list) {
9109 list_del(&set->list);
9111 nft_set_destroy(&ctx, set);
9113 list_for_each_entry_safe(obj, ne, &table->objects, list) {
9116 nft_obj_destroy(&ctx, obj);
9118 list_for_each_entry_safe(chain, nc, &table->chains, list) {
9120 nft_chain_del(chain);
9122 nf_tables_chain_destroy(&ctx);
9124 list_del(&table->list);
9125 nf_tables_table_destroy(&ctx);
9128 static void __nft_release_tables(struct net *net)
9130 struct nft_table *table, *nt;
9132 list_for_each_entry_safe(table, nt, &net->nft.tables, list) {
9133 if (nft_table_has_owner(table))
9136 __nft_release_table(net, table);
9140 static int nft_rcv_nl_event(struct notifier_block *this, unsigned long event,
9143 struct netlink_notify *n = ptr;
9144 struct nft_table *table, *nt;
9145 struct net *net = n->net;
9146 bool release = false;
9148 if (event != NETLINK_URELEASE || n->protocol != NETLINK_NETFILTER)
9151 mutex_lock(&net->nft.commit_mutex);
9152 list_for_each_entry(table, &net->nft.tables, list) {
9153 if (nft_table_has_owner(table) &&
9154 n->portid == table->nlpid) {
9155 __nft_release_hook(net, table);
9161 list_for_each_entry_safe(table, nt, &net->nft.tables, list) {
9162 if (nft_table_has_owner(table) &&
9163 n->portid == table->nlpid)
9164 __nft_release_table(net, table);
9167 mutex_unlock(&net->nft.commit_mutex);
9172 static struct notifier_block nft_nl_notifier = {
9173 .notifier_call = nft_rcv_nl_event,
9176 static int __net_init nf_tables_init_net(struct net *net)
9178 INIT_LIST_HEAD(&net->nft.tables);
9179 INIT_LIST_HEAD(&net->nft.commit_list);
9180 INIT_LIST_HEAD(&net->nft.module_list);
9181 INIT_LIST_HEAD(&net->nft.notify_list);
9182 mutex_init(&net->nft.commit_mutex);
9183 net->nft.base_seq = 1;
9184 net->nft.validate_state = NFT_VALIDATE_SKIP;
9189 static void __net_exit nf_tables_pre_exit_net(struct net *net)
9191 __nft_release_hooks(net);
9194 static void __net_exit nf_tables_exit_net(struct net *net)
9196 mutex_lock(&net->nft.commit_mutex);
9197 if (!list_empty(&net->nft.commit_list))
9198 __nf_tables_abort(net, NFNL_ABORT_NONE);
9199 __nft_release_tables(net);
9200 mutex_unlock(&net->nft.commit_mutex);
9201 WARN_ON_ONCE(!list_empty(&net->nft.tables));
9202 WARN_ON_ONCE(!list_empty(&net->nft.module_list));
9203 WARN_ON_ONCE(!list_empty(&net->nft.notify_list));
9206 static struct pernet_operations nf_tables_net_ops = {
9207 .init = nf_tables_init_net,
9208 .pre_exit = nf_tables_pre_exit_net,
9209 .exit = nf_tables_exit_net,
9212 static int __init nf_tables_module_init(void)
9216 spin_lock_init(&nf_tables_destroy_list_lock);
9217 err = register_pernet_subsys(&nf_tables_net_ops);
9221 err = nft_chain_filter_init();
9223 goto err_chain_filter;
9225 err = nf_tables_core_module_init();
9227 goto err_core_module;
9229 err = register_netdevice_notifier(&nf_tables_flowtable_notifier);
9231 goto err_netdev_notifier;
9233 err = rhltable_init(&nft_objname_ht, &nft_objname_ht_params);
9235 goto err_rht_objname;
9237 err = nft_offload_init();
9241 err = netlink_register_notifier(&nft_nl_notifier);
9243 goto err_netlink_notifier;
9246 err = nfnetlink_subsys_register(&nf_tables_subsys);
9248 goto err_nfnl_subsys;
9250 nft_chain_route_init();
9255 netlink_unregister_notifier(&nft_nl_notifier);
9256 err_netlink_notifier:
9259 rhltable_destroy(&nft_objname_ht);
9261 unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
9262 err_netdev_notifier:
9263 nf_tables_core_module_exit();
9265 nft_chain_filter_fini();
9267 unregister_pernet_subsys(&nf_tables_net_ops);
9271 static void __exit nf_tables_module_exit(void)
9273 nfnetlink_subsys_unregister(&nf_tables_subsys);
9274 netlink_unregister_notifier(&nft_nl_notifier);
9276 unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
9277 nft_chain_filter_fini();
9278 nft_chain_route_fini();
9279 unregister_pernet_subsys(&nf_tables_net_ops);
9280 cancel_work_sync(&trans_destroy_work);
9282 rhltable_destroy(&nft_objname_ht);
9283 nf_tables_core_module_exit();
9286 module_init(nf_tables_module_init);
9287 module_exit(nf_tables_module_exit);
9289 MODULE_LICENSE("GPL");
9290 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
9291 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);