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 unsigned int nf_tables_net_id __read_mostly;
30 static LIST_HEAD(nf_tables_expressions);
31 static LIST_HEAD(nf_tables_objects);
32 static LIST_HEAD(nf_tables_flowtables);
33 static LIST_HEAD(nf_tables_destroy_list);
34 static DEFINE_SPINLOCK(nf_tables_destroy_list_lock);
37 NFT_VALIDATE_SKIP = 0,
42 static struct rhltable nft_objname_ht;
44 static u32 nft_chain_hash(const void *data, u32 len, u32 seed);
45 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed);
46 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *, const void *);
48 static u32 nft_objname_hash(const void *data, u32 len, u32 seed);
49 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed);
50 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *, const void *);
52 static const struct rhashtable_params nft_chain_ht_params = {
53 .head_offset = offsetof(struct nft_chain, rhlhead),
54 .key_offset = offsetof(struct nft_chain, name),
55 .hashfn = nft_chain_hash,
56 .obj_hashfn = nft_chain_hash_obj,
57 .obj_cmpfn = nft_chain_hash_cmp,
58 .automatic_shrinking = true,
61 static const struct rhashtable_params nft_objname_ht_params = {
62 .head_offset = offsetof(struct nft_object, rhlhead),
63 .key_offset = offsetof(struct nft_object, key),
64 .hashfn = nft_objname_hash,
65 .obj_hashfn = nft_objname_hash_obj,
66 .obj_cmpfn = nft_objname_hash_cmp,
67 .automatic_shrinking = true,
70 struct nft_audit_data {
71 struct nft_table *table;
74 struct list_head list;
77 static const u8 nft2audit_op[NFT_MSG_MAX] = { // enum nf_tables_msg_types
78 [NFT_MSG_NEWTABLE] = AUDIT_NFT_OP_TABLE_REGISTER,
79 [NFT_MSG_GETTABLE] = AUDIT_NFT_OP_INVALID,
80 [NFT_MSG_DELTABLE] = AUDIT_NFT_OP_TABLE_UNREGISTER,
81 [NFT_MSG_NEWCHAIN] = AUDIT_NFT_OP_CHAIN_REGISTER,
82 [NFT_MSG_GETCHAIN] = AUDIT_NFT_OP_INVALID,
83 [NFT_MSG_DELCHAIN] = AUDIT_NFT_OP_CHAIN_UNREGISTER,
84 [NFT_MSG_NEWRULE] = AUDIT_NFT_OP_RULE_REGISTER,
85 [NFT_MSG_GETRULE] = AUDIT_NFT_OP_INVALID,
86 [NFT_MSG_DELRULE] = AUDIT_NFT_OP_RULE_UNREGISTER,
87 [NFT_MSG_NEWSET] = AUDIT_NFT_OP_SET_REGISTER,
88 [NFT_MSG_GETSET] = AUDIT_NFT_OP_INVALID,
89 [NFT_MSG_DELSET] = AUDIT_NFT_OP_SET_UNREGISTER,
90 [NFT_MSG_NEWSETELEM] = AUDIT_NFT_OP_SETELEM_REGISTER,
91 [NFT_MSG_GETSETELEM] = AUDIT_NFT_OP_INVALID,
92 [NFT_MSG_DELSETELEM] = AUDIT_NFT_OP_SETELEM_UNREGISTER,
93 [NFT_MSG_NEWGEN] = AUDIT_NFT_OP_GEN_REGISTER,
94 [NFT_MSG_GETGEN] = AUDIT_NFT_OP_INVALID,
95 [NFT_MSG_TRACE] = AUDIT_NFT_OP_INVALID,
96 [NFT_MSG_NEWOBJ] = AUDIT_NFT_OP_OBJ_REGISTER,
97 [NFT_MSG_GETOBJ] = AUDIT_NFT_OP_INVALID,
98 [NFT_MSG_DELOBJ] = AUDIT_NFT_OP_OBJ_UNREGISTER,
99 [NFT_MSG_GETOBJ_RESET] = AUDIT_NFT_OP_OBJ_RESET,
100 [NFT_MSG_NEWFLOWTABLE] = AUDIT_NFT_OP_FLOWTABLE_REGISTER,
101 [NFT_MSG_GETFLOWTABLE] = AUDIT_NFT_OP_INVALID,
102 [NFT_MSG_DELFLOWTABLE] = AUDIT_NFT_OP_FLOWTABLE_UNREGISTER,
105 static void nft_validate_state_update(struct net *net, u8 new_validate_state)
107 struct nftables_pernet *nft_net = nft_pernet(net);
109 switch (nft_net->validate_state) {
110 case NFT_VALIDATE_SKIP:
111 WARN_ON_ONCE(new_validate_state == NFT_VALIDATE_DO);
113 case NFT_VALIDATE_NEED:
115 case NFT_VALIDATE_DO:
116 if (new_validate_state == NFT_VALIDATE_NEED)
120 nft_net->validate_state = new_validate_state;
122 static void nf_tables_trans_destroy_work(struct work_struct *w);
123 static DECLARE_WORK(trans_destroy_work, nf_tables_trans_destroy_work);
125 static void nft_ctx_init(struct nft_ctx *ctx,
127 const struct sk_buff *skb,
128 const struct nlmsghdr *nlh,
130 struct nft_table *table,
131 struct nft_chain *chain,
132 const struct nlattr * const *nla)
135 ctx->family = family;
140 ctx->portid = NETLINK_CB(skb).portid;
141 ctx->report = nlmsg_report(nlh);
142 ctx->flags = nlh->nlmsg_flags;
143 ctx->seq = nlh->nlmsg_seq;
146 static struct nft_trans *nft_trans_alloc_gfp(const struct nft_ctx *ctx,
147 int msg_type, u32 size, gfp_t gfp)
149 struct nft_trans *trans;
151 trans = kzalloc(sizeof(struct nft_trans) + size, gfp);
155 INIT_LIST_HEAD(&trans->list);
156 trans->msg_type = msg_type;
162 static struct nft_trans *nft_trans_alloc(const struct nft_ctx *ctx,
163 int msg_type, u32 size)
165 return nft_trans_alloc_gfp(ctx, msg_type, size, GFP_KERNEL);
168 static void nft_trans_destroy(struct nft_trans *trans)
170 list_del(&trans->list);
174 static void nft_set_trans_bind(const struct nft_ctx *ctx, struct nft_set *set)
176 struct nftables_pernet *nft_net;
177 struct net *net = ctx->net;
178 struct nft_trans *trans;
180 if (!nft_set_is_anonymous(set))
183 nft_net = nft_pernet(net);
184 list_for_each_entry_reverse(trans, &nft_net->commit_list, list) {
185 switch (trans->msg_type) {
187 if (nft_trans_set(trans) == set)
188 nft_trans_set_bound(trans) = true;
190 case NFT_MSG_NEWSETELEM:
191 if (nft_trans_elem_set(trans) == set)
192 nft_trans_elem_set_bound(trans) = true;
198 static int nft_netdev_register_hooks(struct net *net,
199 struct list_head *hook_list)
201 struct nft_hook *hook;
205 list_for_each_entry(hook, hook_list, list) {
206 err = nf_register_net_hook(net, &hook->ops);
215 list_for_each_entry(hook, hook_list, list) {
219 nf_unregister_net_hook(net, &hook->ops);
224 static void nft_netdev_unregister_hooks(struct net *net,
225 struct list_head *hook_list,
228 struct nft_hook *hook, *next;
230 list_for_each_entry_safe(hook, next, hook_list, list) {
231 nf_unregister_net_hook(net, &hook->ops);
232 if (release_netdev) {
233 list_del(&hook->list);
234 kfree_rcu(hook, rcu);
239 static int nf_tables_register_hook(struct net *net,
240 const struct nft_table *table,
241 struct nft_chain *chain)
243 struct nft_base_chain *basechain;
244 const struct nf_hook_ops *ops;
246 if (table->flags & NFT_TABLE_F_DORMANT ||
247 !nft_is_base_chain(chain))
250 basechain = nft_base_chain(chain);
251 ops = &basechain->ops;
253 if (basechain->type->ops_register)
254 return basechain->type->ops_register(net, ops);
256 if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
257 return nft_netdev_register_hooks(net, &basechain->hook_list);
259 return nf_register_net_hook(net, &basechain->ops);
262 static void __nf_tables_unregister_hook(struct net *net,
263 const struct nft_table *table,
264 struct nft_chain *chain,
267 struct nft_base_chain *basechain;
268 const struct nf_hook_ops *ops;
270 if (table->flags & NFT_TABLE_F_DORMANT ||
271 !nft_is_base_chain(chain))
273 basechain = nft_base_chain(chain);
274 ops = &basechain->ops;
276 if (basechain->type->ops_unregister)
277 return basechain->type->ops_unregister(net, ops);
279 if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
280 nft_netdev_unregister_hooks(net, &basechain->hook_list,
283 nf_unregister_net_hook(net, &basechain->ops);
286 static void nf_tables_unregister_hook(struct net *net,
287 const struct nft_table *table,
288 struct nft_chain *chain)
290 return __nf_tables_unregister_hook(net, table, chain, false);
293 static void nft_trans_commit_list_add_tail(struct net *net, struct nft_trans *trans)
295 struct nftables_pernet *nft_net = nft_pernet(net);
297 list_add_tail(&trans->list, &nft_net->commit_list);
300 static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type)
302 struct nft_trans *trans;
304 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table));
308 if (msg_type == NFT_MSG_NEWTABLE)
309 nft_activate_next(ctx->net, ctx->table);
311 nft_trans_commit_list_add_tail(ctx->net, trans);
315 static int nft_deltable(struct nft_ctx *ctx)
319 err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE);
323 nft_deactivate_next(ctx->net, ctx->table);
327 static struct nft_trans *nft_trans_chain_add(struct nft_ctx *ctx, int msg_type)
329 struct nft_trans *trans;
331 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain));
333 return ERR_PTR(-ENOMEM);
335 if (msg_type == NFT_MSG_NEWCHAIN) {
336 nft_activate_next(ctx->net, ctx->chain);
338 if (ctx->nla[NFTA_CHAIN_ID]) {
339 nft_trans_chain_id(trans) =
340 ntohl(nla_get_be32(ctx->nla[NFTA_CHAIN_ID]));
344 nft_trans_commit_list_add_tail(ctx->net, trans);
348 static int nft_delchain(struct nft_ctx *ctx)
350 struct nft_trans *trans;
352 trans = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN);
354 return PTR_ERR(trans);
357 nft_deactivate_next(ctx->net, ctx->chain);
362 static void nft_rule_expr_activate(const struct nft_ctx *ctx,
363 struct nft_rule *rule)
365 struct nft_expr *expr;
367 expr = nft_expr_first(rule);
368 while (nft_expr_more(rule, expr)) {
369 if (expr->ops->activate)
370 expr->ops->activate(ctx, expr);
372 expr = nft_expr_next(expr);
376 static void nft_rule_expr_deactivate(const struct nft_ctx *ctx,
377 struct nft_rule *rule,
378 enum nft_trans_phase phase)
380 struct nft_expr *expr;
382 expr = nft_expr_first(rule);
383 while (nft_expr_more(rule, expr)) {
384 if (expr->ops->deactivate)
385 expr->ops->deactivate(ctx, expr, phase);
387 expr = nft_expr_next(expr);
392 nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule)
394 /* You cannot delete the same rule twice */
395 if (nft_is_active_next(ctx->net, rule)) {
396 nft_deactivate_next(ctx->net, rule);
403 static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type,
404 struct nft_rule *rule)
406 struct nft_trans *trans;
408 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule));
412 if (msg_type == NFT_MSG_NEWRULE && ctx->nla[NFTA_RULE_ID] != NULL) {
413 nft_trans_rule_id(trans) =
414 ntohl(nla_get_be32(ctx->nla[NFTA_RULE_ID]));
416 nft_trans_rule(trans) = rule;
417 nft_trans_commit_list_add_tail(ctx->net, trans);
422 static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule)
424 struct nft_flow_rule *flow;
425 struct nft_trans *trans;
428 trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule);
432 if (ctx->chain->flags & NFT_CHAIN_HW_OFFLOAD) {
433 flow = nft_flow_rule_create(ctx->net, rule);
435 nft_trans_destroy(trans);
436 return PTR_ERR(flow);
439 nft_trans_flow_rule(trans) = flow;
442 err = nf_tables_delrule_deactivate(ctx, rule);
444 nft_trans_destroy(trans);
447 nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_PREPARE);
452 static int nft_delrule_by_chain(struct nft_ctx *ctx)
454 struct nft_rule *rule;
457 list_for_each_entry(rule, &ctx->chain->rules, list) {
458 if (!nft_is_active_next(ctx->net, rule))
461 err = nft_delrule(ctx, rule);
468 static int __nft_trans_set_add(const struct nft_ctx *ctx, int msg_type,
470 const struct nft_set_desc *desc)
472 struct nft_trans *trans;
474 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
478 if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] && !desc) {
479 nft_trans_set_id(trans) =
480 ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
481 nft_activate_next(ctx->net, set);
483 nft_trans_set(trans) = set;
485 nft_trans_set_update(trans) = true;
486 nft_trans_set_gc_int(trans) = desc->gc_int;
487 nft_trans_set_timeout(trans) = desc->timeout;
489 nft_trans_commit_list_add_tail(ctx->net, trans);
494 static int nft_trans_set_add(const struct nft_ctx *ctx, int msg_type,
497 return __nft_trans_set_add(ctx, msg_type, set, NULL);
500 static int nft_delset(const struct nft_ctx *ctx, struct nft_set *set)
504 err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set);
508 nft_deactivate_next(ctx->net, set);
514 static int nft_trans_obj_add(struct nft_ctx *ctx, int msg_type,
515 struct nft_object *obj)
517 struct nft_trans *trans;
519 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_obj));
523 if (msg_type == NFT_MSG_NEWOBJ)
524 nft_activate_next(ctx->net, obj);
526 nft_trans_obj(trans) = obj;
527 nft_trans_commit_list_add_tail(ctx->net, trans);
532 static int nft_delobj(struct nft_ctx *ctx, struct nft_object *obj)
536 err = nft_trans_obj_add(ctx, NFT_MSG_DELOBJ, obj);
540 nft_deactivate_next(ctx->net, obj);
546 static int nft_trans_flowtable_add(struct nft_ctx *ctx, int msg_type,
547 struct nft_flowtable *flowtable)
549 struct nft_trans *trans;
551 trans = nft_trans_alloc(ctx, msg_type,
552 sizeof(struct nft_trans_flowtable));
556 if (msg_type == NFT_MSG_NEWFLOWTABLE)
557 nft_activate_next(ctx->net, flowtable);
559 INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
560 nft_trans_flowtable(trans) = flowtable;
561 nft_trans_commit_list_add_tail(ctx->net, trans);
566 static int nft_delflowtable(struct nft_ctx *ctx,
567 struct nft_flowtable *flowtable)
571 err = nft_trans_flowtable_add(ctx, NFT_MSG_DELFLOWTABLE, flowtable);
575 nft_deactivate_next(ctx->net, flowtable);
585 static struct nft_table *nft_table_lookup(const struct net *net,
586 const struct nlattr *nla,
587 u8 family, u8 genmask, u32 nlpid)
589 struct nftables_pernet *nft_net;
590 struct nft_table *table;
593 return ERR_PTR(-EINVAL);
595 nft_net = nft_pernet(net);
596 list_for_each_entry_rcu(table, &nft_net->tables, list,
597 lockdep_is_held(&nft_net->commit_mutex)) {
598 if (!nla_strcmp(nla, table->name) &&
599 table->family == family &&
600 nft_active_genmask(table, genmask)) {
601 if (nft_table_has_owner(table) &&
602 nlpid && table->nlpid != nlpid)
603 return ERR_PTR(-EPERM);
609 return ERR_PTR(-ENOENT);
612 static struct nft_table *nft_table_lookup_byhandle(const struct net *net,
613 const struct nlattr *nla,
614 u8 genmask, u32 nlpid)
616 struct nftables_pernet *nft_net;
617 struct nft_table *table;
619 nft_net = nft_pernet(net);
620 list_for_each_entry(table, &nft_net->tables, list) {
621 if (be64_to_cpu(nla_get_be64(nla)) == table->handle &&
622 nft_active_genmask(table, genmask)) {
623 if (nft_table_has_owner(table) &&
624 nlpid && table->nlpid != nlpid)
625 return ERR_PTR(-EPERM);
631 return ERR_PTR(-ENOENT);
634 static inline u64 nf_tables_alloc_handle(struct nft_table *table)
636 return ++table->hgenerator;
639 static const struct nft_chain_type *chain_type[NFPROTO_NUMPROTO][NFT_CHAIN_T_MAX];
641 static const struct nft_chain_type *
642 __nft_chain_type_get(u8 family, enum nft_chain_types type)
644 if (family >= NFPROTO_NUMPROTO ||
645 type >= NFT_CHAIN_T_MAX)
648 return chain_type[family][type];
651 static const struct nft_chain_type *
652 __nf_tables_chain_type_lookup(const struct nlattr *nla, u8 family)
654 const struct nft_chain_type *type;
657 for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
658 type = __nft_chain_type_get(family, i);
661 if (!nla_strcmp(nla, type->name))
667 struct nft_module_request {
668 struct list_head list;
669 char module[MODULE_NAME_LEN];
673 #ifdef CONFIG_MODULES
674 __printf(2, 3) int nft_request_module(struct net *net, const char *fmt,
677 char module_name[MODULE_NAME_LEN];
678 struct nftables_pernet *nft_net;
679 struct nft_module_request *req;
684 ret = vsnprintf(module_name, MODULE_NAME_LEN, fmt, args);
686 if (ret >= MODULE_NAME_LEN)
689 nft_net = nft_pernet(net);
690 list_for_each_entry(req, &nft_net->module_list, list) {
691 if (!strcmp(req->module, module_name)) {
695 /* A request to load this module already exists. */
700 req = kmalloc(sizeof(*req), GFP_KERNEL);
705 strlcpy(req->module, module_name, MODULE_NAME_LEN);
706 list_add_tail(&req->list, &nft_net->module_list);
710 EXPORT_SYMBOL_GPL(nft_request_module);
713 static void lockdep_nfnl_nft_mutex_not_held(void)
715 #ifdef CONFIG_PROVE_LOCKING
717 WARN_ON_ONCE(lockdep_nfnl_is_held(NFNL_SUBSYS_NFTABLES));
721 static const struct nft_chain_type *
722 nf_tables_chain_type_lookup(struct net *net, const struct nlattr *nla,
723 u8 family, bool autoload)
725 const struct nft_chain_type *type;
727 type = __nf_tables_chain_type_lookup(nla, family);
731 lockdep_nfnl_nft_mutex_not_held();
732 #ifdef CONFIG_MODULES
734 if (nft_request_module(net, "nft-chain-%u-%.*s", family,
736 (const char *)nla_data(nla)) == -EAGAIN)
737 return ERR_PTR(-EAGAIN);
740 return ERR_PTR(-ENOENT);
743 static __be16 nft_base_seq(const struct net *net)
745 struct nftables_pernet *nft_net = nft_pernet(net);
747 return htons(nft_net->base_seq & 0xffff);
750 static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
751 [NFTA_TABLE_NAME] = { .type = NLA_STRING,
752 .len = NFT_TABLE_MAXNAMELEN - 1 },
753 [NFTA_TABLE_FLAGS] = { .type = NLA_U32 },
754 [NFTA_TABLE_HANDLE] = { .type = NLA_U64 },
755 [NFTA_TABLE_USERDATA] = { .type = NLA_BINARY,
756 .len = NFT_USERDATA_MAXLEN }
759 static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
760 u32 portid, u32 seq, int event, u32 flags,
761 int family, const struct nft_table *table)
763 struct nlmsghdr *nlh;
765 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
766 nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
767 NFNETLINK_V0, nft_base_seq(net));
769 goto nla_put_failure;
771 if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
772 nla_put_be32(skb, NFTA_TABLE_FLAGS,
773 htonl(table->flags & NFT_TABLE_F_MASK)) ||
774 nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)) ||
775 nla_put_be64(skb, NFTA_TABLE_HANDLE, cpu_to_be64(table->handle),
777 goto nla_put_failure;
778 if (nft_table_has_owner(table) &&
779 nla_put_be32(skb, NFTA_TABLE_OWNER, htonl(table->nlpid)))
780 goto nla_put_failure;
783 if (nla_put(skb, NFTA_TABLE_USERDATA, table->udlen, table->udata))
784 goto nla_put_failure;
791 nlmsg_trim(skb, nlh);
795 struct nftnl_skb_parms {
798 #define NFT_CB(skb) (*(struct nftnl_skb_parms*)&((skb)->cb))
800 static void nft_notify_enqueue(struct sk_buff *skb, bool report,
801 struct list_head *notify_list)
803 NFT_CB(skb).report = report;
804 list_add_tail(&skb->list, notify_list);
807 static void nf_tables_table_notify(const struct nft_ctx *ctx, int event)
809 struct nftables_pernet *nft_net;
815 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
818 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
822 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
823 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
825 err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
826 event, flags, ctx->family, ctx->table);
832 nft_net = nft_pernet(ctx->net);
833 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
836 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
839 static int nf_tables_dump_tables(struct sk_buff *skb,
840 struct netlink_callback *cb)
842 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
843 struct nftables_pernet *nft_net;
844 const struct nft_table *table;
845 unsigned int idx = 0, s_idx = cb->args[0];
846 struct net *net = sock_net(skb->sk);
847 int family = nfmsg->nfgen_family;
850 nft_net = nft_pernet(net);
851 cb->seq = READ_ONCE(nft_net->base_seq);
853 list_for_each_entry_rcu(table, &nft_net->tables, list) {
854 if (family != NFPROTO_UNSPEC && family != table->family)
860 memset(&cb->args[1], 0,
861 sizeof(cb->args) - sizeof(cb->args[0]));
862 if (!nft_is_active(net, table))
864 if (nf_tables_fill_table_info(skb, net,
865 NETLINK_CB(cb->skb).portid,
867 NFT_MSG_NEWTABLE, NLM_F_MULTI,
868 table->family, table) < 0)
871 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
881 static int nft_netlink_dump_start_rcu(struct sock *nlsk, struct sk_buff *skb,
882 const struct nlmsghdr *nlh,
883 struct netlink_dump_control *c)
887 if (!try_module_get(THIS_MODULE))
891 err = netlink_dump_start(nlsk, skb, nlh, c);
893 module_put(THIS_MODULE);
898 /* called with rcu_read_lock held */
899 static int nf_tables_gettable(struct sk_buff *skb, const struct nfnl_info *info,
900 const struct nlattr * const nla[])
902 struct netlink_ext_ack *extack = info->extack;
903 u8 genmask = nft_genmask_cur(info->net);
904 u8 family = info->nfmsg->nfgen_family;
905 const struct nft_table *table;
906 struct net *net = info->net;
907 struct sk_buff *skb2;
910 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
911 struct netlink_dump_control c = {
912 .dump = nf_tables_dump_tables,
913 .module = THIS_MODULE,
916 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
919 table = nft_table_lookup(net, nla[NFTA_TABLE_NAME], family, genmask, 0);
921 NL_SET_BAD_ATTR(extack, nla[NFTA_TABLE_NAME]);
922 return PTR_ERR(table);
925 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
929 err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
930 info->nlh->nlmsg_seq, NFT_MSG_NEWTABLE,
933 goto err_fill_table_info;
935 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
942 static void nft_table_disable(struct net *net, struct nft_table *table, u32 cnt)
944 struct nft_chain *chain;
947 list_for_each_entry(chain, &table->chains, list) {
948 if (!nft_is_active_next(net, chain))
950 if (!nft_is_base_chain(chain))
953 if (cnt && i++ == cnt)
956 nf_tables_unregister_hook(net, table, chain);
960 static int nf_tables_table_enable(struct net *net, struct nft_table *table)
962 struct nft_chain *chain;
965 list_for_each_entry(chain, &table->chains, list) {
966 if (!nft_is_active_next(net, chain))
968 if (!nft_is_base_chain(chain))
971 err = nf_tables_register_hook(net, table, chain);
973 goto err_register_hooks;
981 nft_table_disable(net, table, i);
985 static void nf_tables_table_disable(struct net *net, struct nft_table *table)
987 table->flags &= ~NFT_TABLE_F_DORMANT;
988 nft_table_disable(net, table, 0);
989 table->flags |= NFT_TABLE_F_DORMANT;
992 #define __NFT_TABLE_F_INTERNAL (NFT_TABLE_F_MASK + 1)
993 #define __NFT_TABLE_F_WAS_DORMANT (__NFT_TABLE_F_INTERNAL << 0)
994 #define __NFT_TABLE_F_WAS_AWAKEN (__NFT_TABLE_F_INTERNAL << 1)
995 #define __NFT_TABLE_F_UPDATE (__NFT_TABLE_F_WAS_DORMANT | \
996 __NFT_TABLE_F_WAS_AWAKEN)
998 static int nf_tables_updtable(struct nft_ctx *ctx)
1000 struct nft_trans *trans;
1004 if (!ctx->nla[NFTA_TABLE_FLAGS])
1007 flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
1008 if (flags & ~NFT_TABLE_F_MASK)
1011 if (flags == ctx->table->flags)
1014 if ((nft_table_has_owner(ctx->table) &&
1015 !(flags & NFT_TABLE_F_OWNER)) ||
1016 (!nft_table_has_owner(ctx->table) &&
1017 flags & NFT_TABLE_F_OWNER))
1020 trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
1021 sizeof(struct nft_trans_table));
1025 if ((flags & NFT_TABLE_F_DORMANT) &&
1026 !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
1027 ctx->table->flags |= NFT_TABLE_F_DORMANT;
1028 if (!(ctx->table->flags & __NFT_TABLE_F_UPDATE))
1029 ctx->table->flags |= __NFT_TABLE_F_WAS_AWAKEN;
1030 } else if (!(flags & NFT_TABLE_F_DORMANT) &&
1031 ctx->table->flags & NFT_TABLE_F_DORMANT) {
1032 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
1033 if (!(ctx->table->flags & __NFT_TABLE_F_UPDATE)) {
1034 ret = nf_tables_table_enable(ctx->net, ctx->table);
1036 goto err_register_hooks;
1038 ctx->table->flags |= __NFT_TABLE_F_WAS_DORMANT;
1042 nft_trans_table_update(trans) = true;
1043 nft_trans_commit_list_add_tail(ctx->net, trans);
1048 nft_trans_destroy(trans);
1052 static u32 nft_chain_hash(const void *data, u32 len, u32 seed)
1054 const char *name = data;
1056 return jhash(name, strlen(name), seed);
1059 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed)
1061 const struct nft_chain *chain = data;
1063 return nft_chain_hash(chain->name, 0, seed);
1066 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *arg,
1069 const struct nft_chain *chain = ptr;
1070 const char *name = arg->key;
1072 return strcmp(chain->name, name);
1075 static u32 nft_objname_hash(const void *data, u32 len, u32 seed)
1077 const struct nft_object_hash_key *k = data;
1079 seed ^= hash_ptr(k->table, 32);
1081 return jhash(k->name, strlen(k->name), seed);
1084 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed)
1086 const struct nft_object *obj = data;
1088 return nft_objname_hash(&obj->key, 0, seed);
1091 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *arg,
1094 const struct nft_object_hash_key *k = arg->key;
1095 const struct nft_object *obj = ptr;
1097 if (obj->key.table != k->table)
1100 return strcmp(obj->key.name, k->name);
1103 static int nf_tables_newtable(struct sk_buff *skb, const struct nfnl_info *info,
1104 const struct nlattr * const nla[])
1106 struct nftables_pernet *nft_net = nft_pernet(info->net);
1107 struct netlink_ext_ack *extack = info->extack;
1108 u8 genmask = nft_genmask_next(info->net);
1109 u8 family = info->nfmsg->nfgen_family;
1110 struct net *net = info->net;
1111 const struct nlattr *attr;
1112 struct nft_table *table;
1117 lockdep_assert_held(&nft_net->commit_mutex);
1118 attr = nla[NFTA_TABLE_NAME];
1119 table = nft_table_lookup(net, attr, family, genmask,
1120 NETLINK_CB(skb).portid);
1121 if (IS_ERR(table)) {
1122 if (PTR_ERR(table) != -ENOENT)
1123 return PTR_ERR(table);
1125 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
1126 NL_SET_BAD_ATTR(extack, attr);
1129 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
1132 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
1134 return nf_tables_updtable(&ctx);
1137 if (nla[NFTA_TABLE_FLAGS]) {
1138 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
1139 if (flags & ~NFT_TABLE_F_MASK)
1144 table = kzalloc(sizeof(*table), GFP_KERNEL);
1148 table->name = nla_strdup(attr, GFP_KERNEL);
1149 if (table->name == NULL)
1152 if (nla[NFTA_TABLE_USERDATA]) {
1153 table->udata = nla_memdup(nla[NFTA_TABLE_USERDATA], GFP_KERNEL);
1154 if (table->udata == NULL)
1155 goto err_table_udata;
1157 table->udlen = nla_len(nla[NFTA_TABLE_USERDATA]);
1160 err = rhltable_init(&table->chains_ht, &nft_chain_ht_params);
1164 INIT_LIST_HEAD(&table->chains);
1165 INIT_LIST_HEAD(&table->sets);
1166 INIT_LIST_HEAD(&table->objects);
1167 INIT_LIST_HEAD(&table->flowtables);
1168 table->family = family;
1169 table->flags = flags;
1170 table->handle = ++nft_net->table_handle;
1171 if (table->flags & NFT_TABLE_F_OWNER)
1172 table->nlpid = NETLINK_CB(skb).portid;
1174 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
1175 err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
1179 list_add_tail_rcu(&table->list, &nft_net->tables);
1182 rhltable_destroy(&table->chains_ht);
1184 kfree(table->udata);
1193 static int nft_flush_table(struct nft_ctx *ctx)
1195 struct nft_flowtable *flowtable, *nft;
1196 struct nft_chain *chain, *nc;
1197 struct nft_object *obj, *ne;
1198 struct nft_set *set, *ns;
1201 list_for_each_entry(chain, &ctx->table->chains, list) {
1202 if (!nft_is_active_next(ctx->net, chain))
1205 if (nft_chain_is_bound(chain))
1210 err = nft_delrule_by_chain(ctx);
1215 list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
1216 if (!nft_is_active_next(ctx->net, set))
1219 if (nft_set_is_anonymous(set) &&
1220 !list_empty(&set->bindings))
1223 err = nft_delset(ctx, set);
1228 list_for_each_entry_safe(flowtable, nft, &ctx->table->flowtables, list) {
1229 if (!nft_is_active_next(ctx->net, flowtable))
1232 err = nft_delflowtable(ctx, flowtable);
1237 list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) {
1238 if (!nft_is_active_next(ctx->net, obj))
1241 err = nft_delobj(ctx, obj);
1246 list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
1247 if (!nft_is_active_next(ctx->net, chain))
1250 if (nft_chain_is_bound(chain))
1255 err = nft_delchain(ctx);
1260 err = nft_deltable(ctx);
1265 static int nft_flush(struct nft_ctx *ctx, int family)
1267 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
1268 const struct nlattr * const *nla = ctx->nla;
1269 struct nft_table *table, *nt;
1272 list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
1273 if (family != AF_UNSPEC && table->family != family)
1276 ctx->family = table->family;
1278 if (!nft_is_active_next(ctx->net, table))
1281 if (nft_table_has_owner(table) && table->nlpid != ctx->portid)
1284 if (nla[NFTA_TABLE_NAME] &&
1285 nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
1290 err = nft_flush_table(ctx);
1298 static int nf_tables_deltable(struct sk_buff *skb, const struct nfnl_info *info,
1299 const struct nlattr * const nla[])
1301 struct netlink_ext_ack *extack = info->extack;
1302 u8 genmask = nft_genmask_next(info->net);
1303 u8 family = info->nfmsg->nfgen_family;
1304 struct net *net = info->net;
1305 const struct nlattr *attr;
1306 struct nft_table *table;
1309 nft_ctx_init(&ctx, net, skb, info->nlh, 0, NULL, NULL, nla);
1310 if (family == AF_UNSPEC ||
1311 (!nla[NFTA_TABLE_NAME] && !nla[NFTA_TABLE_HANDLE]))
1312 return nft_flush(&ctx, family);
1314 if (nla[NFTA_TABLE_HANDLE]) {
1315 attr = nla[NFTA_TABLE_HANDLE];
1316 table = nft_table_lookup_byhandle(net, attr, genmask,
1317 NETLINK_CB(skb).portid);
1319 attr = nla[NFTA_TABLE_NAME];
1320 table = nft_table_lookup(net, attr, family, genmask,
1321 NETLINK_CB(skb).portid);
1324 if (IS_ERR(table)) {
1325 NL_SET_BAD_ATTR(extack, attr);
1326 return PTR_ERR(table);
1329 if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
1333 ctx.family = family;
1336 return nft_flush_table(&ctx);
1339 static void nf_tables_table_destroy(struct nft_ctx *ctx)
1341 if (WARN_ON(ctx->table->use > 0))
1344 rhltable_destroy(&ctx->table->chains_ht);
1345 kfree(ctx->table->name);
1346 kfree(ctx->table->udata);
1350 void nft_register_chain_type(const struct nft_chain_type *ctype)
1352 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1353 if (WARN_ON(__nft_chain_type_get(ctype->family, ctype->type))) {
1354 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1357 chain_type[ctype->family][ctype->type] = ctype;
1358 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1360 EXPORT_SYMBOL_GPL(nft_register_chain_type);
1362 void nft_unregister_chain_type(const struct nft_chain_type *ctype)
1364 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1365 chain_type[ctype->family][ctype->type] = NULL;
1366 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1368 EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
1374 static struct nft_chain *
1375 nft_chain_lookup_byhandle(const struct nft_table *table, u64 handle, u8 genmask)
1377 struct nft_chain *chain;
1379 list_for_each_entry(chain, &table->chains, list) {
1380 if (chain->handle == handle &&
1381 nft_active_genmask(chain, genmask))
1385 return ERR_PTR(-ENOENT);
1388 static bool lockdep_commit_lock_is_held(const struct net *net)
1390 #ifdef CONFIG_PROVE_LOCKING
1391 struct nftables_pernet *nft_net = nft_pernet(net);
1393 return lockdep_is_held(&nft_net->commit_mutex);
1399 static struct nft_chain *nft_chain_lookup(struct net *net,
1400 struct nft_table *table,
1401 const struct nlattr *nla, u8 genmask)
1403 char search[NFT_CHAIN_MAXNAMELEN + 1];
1404 struct rhlist_head *tmp, *list;
1405 struct nft_chain *chain;
1408 return ERR_PTR(-EINVAL);
1410 nla_strscpy(search, nla, sizeof(search));
1412 WARN_ON(!rcu_read_lock_held() &&
1413 !lockdep_commit_lock_is_held(net));
1415 chain = ERR_PTR(-ENOENT);
1417 list = rhltable_lookup(&table->chains_ht, search, nft_chain_ht_params);
1421 rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
1422 if (nft_active_genmask(chain, genmask))
1425 chain = ERR_PTR(-ENOENT);
1431 static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
1432 [NFTA_CHAIN_TABLE] = { .type = NLA_STRING,
1433 .len = NFT_TABLE_MAXNAMELEN - 1 },
1434 [NFTA_CHAIN_HANDLE] = { .type = NLA_U64 },
1435 [NFTA_CHAIN_NAME] = { .type = NLA_STRING,
1436 .len = NFT_CHAIN_MAXNAMELEN - 1 },
1437 [NFTA_CHAIN_HOOK] = { .type = NLA_NESTED },
1438 [NFTA_CHAIN_POLICY] = { .type = NLA_U32 },
1439 [NFTA_CHAIN_TYPE] = { .type = NLA_STRING,
1440 .len = NFT_MODULE_AUTOLOAD_LIMIT },
1441 [NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED },
1442 [NFTA_CHAIN_FLAGS] = { .type = NLA_U32 },
1443 [NFTA_CHAIN_ID] = { .type = NLA_U32 },
1444 [NFTA_CHAIN_USERDATA] = { .type = NLA_BINARY,
1445 .len = NFT_USERDATA_MAXLEN },
1448 static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
1449 [NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 },
1450 [NFTA_HOOK_PRIORITY] = { .type = NLA_U32 },
1451 [NFTA_HOOK_DEV] = { .type = NLA_STRING,
1452 .len = IFNAMSIZ - 1 },
1455 static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
1457 struct nft_stats *cpu_stats, total;
1458 struct nlattr *nest;
1466 memset(&total, 0, sizeof(total));
1467 for_each_possible_cpu(cpu) {
1468 cpu_stats = per_cpu_ptr(stats, cpu);
1470 seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
1471 pkts = cpu_stats->pkts;
1472 bytes = cpu_stats->bytes;
1473 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq));
1475 total.bytes += bytes;
1477 nest = nla_nest_start_noflag(skb, NFTA_CHAIN_COUNTERS);
1479 goto nla_put_failure;
1481 if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts),
1482 NFTA_COUNTER_PAD) ||
1483 nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
1485 goto nla_put_failure;
1487 nla_nest_end(skb, nest);
1494 static int nft_dump_basechain_hook(struct sk_buff *skb, int family,
1495 const struct nft_base_chain *basechain)
1497 const struct nf_hook_ops *ops = &basechain->ops;
1498 struct nft_hook *hook, *first = NULL;
1499 struct nlattr *nest, *nest_devs;
1502 nest = nla_nest_start_noflag(skb, NFTA_CHAIN_HOOK);
1504 goto nla_put_failure;
1505 if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
1506 goto nla_put_failure;
1507 if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
1508 goto nla_put_failure;
1510 if (nft_base_chain_netdev(family, ops->hooknum)) {
1511 nest_devs = nla_nest_start_noflag(skb, NFTA_HOOK_DEVS);
1512 list_for_each_entry(hook, &basechain->hook_list, list) {
1516 if (nla_put_string(skb, NFTA_DEVICE_NAME,
1517 hook->ops.dev->name))
1518 goto nla_put_failure;
1521 nla_nest_end(skb, nest_devs);
1524 nla_put_string(skb, NFTA_HOOK_DEV, first->ops.dev->name))
1525 goto nla_put_failure;
1527 nla_nest_end(skb, nest);
1534 static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
1535 u32 portid, u32 seq, int event, u32 flags,
1536 int family, const struct nft_table *table,
1537 const struct nft_chain *chain)
1539 struct nlmsghdr *nlh;
1541 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
1542 nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
1543 NFNETLINK_V0, nft_base_seq(net));
1545 goto nla_put_failure;
1547 if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name))
1548 goto nla_put_failure;
1549 if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle),
1551 goto nla_put_failure;
1552 if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name))
1553 goto nla_put_failure;
1555 if (nft_is_base_chain(chain)) {
1556 const struct nft_base_chain *basechain = nft_base_chain(chain);
1557 struct nft_stats __percpu *stats;
1559 if (nft_dump_basechain_hook(skb, family, basechain))
1560 goto nla_put_failure;
1562 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
1563 htonl(basechain->policy)))
1564 goto nla_put_failure;
1566 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
1567 goto nla_put_failure;
1569 stats = rcu_dereference_check(basechain->stats,
1570 lockdep_commit_lock_is_held(net));
1571 if (nft_dump_stats(skb, stats))
1572 goto nla_put_failure;
1576 nla_put_be32(skb, NFTA_CHAIN_FLAGS, htonl(chain->flags)))
1577 goto nla_put_failure;
1579 if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
1580 goto nla_put_failure;
1583 nla_put(skb, NFTA_CHAIN_USERDATA, chain->udlen, chain->udata))
1584 goto nla_put_failure;
1586 nlmsg_end(skb, nlh);
1590 nlmsg_trim(skb, nlh);
1594 static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event)
1596 struct nftables_pernet *nft_net;
1597 struct sk_buff *skb;
1602 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1605 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1609 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
1610 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
1612 err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
1613 event, flags, ctx->family, ctx->table,
1620 nft_net = nft_pernet(ctx->net);
1621 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
1624 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
1627 static int nf_tables_dump_chains(struct sk_buff *skb,
1628 struct netlink_callback *cb)
1630 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1631 unsigned int idx = 0, s_idx = cb->args[0];
1632 struct net *net = sock_net(skb->sk);
1633 int family = nfmsg->nfgen_family;
1634 struct nftables_pernet *nft_net;
1635 const struct nft_table *table;
1636 const struct nft_chain *chain;
1639 nft_net = nft_pernet(net);
1640 cb->seq = READ_ONCE(nft_net->base_seq);
1642 list_for_each_entry_rcu(table, &nft_net->tables, list) {
1643 if (family != NFPROTO_UNSPEC && family != table->family)
1646 list_for_each_entry_rcu(chain, &table->chains, list) {
1650 memset(&cb->args[1], 0,
1651 sizeof(cb->args) - sizeof(cb->args[0]));
1652 if (!nft_is_active(net, chain))
1654 if (nf_tables_fill_chain_info(skb, net,
1655 NETLINK_CB(cb->skb).portid,
1659 table->family, table,
1663 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1674 /* called with rcu_read_lock held */
1675 static int nf_tables_getchain(struct sk_buff *skb, const struct nfnl_info *info,
1676 const struct nlattr * const nla[])
1678 struct netlink_ext_ack *extack = info->extack;
1679 u8 genmask = nft_genmask_cur(info->net);
1680 u8 family = info->nfmsg->nfgen_family;
1681 const struct nft_chain *chain;
1682 struct net *net = info->net;
1683 struct nft_table *table;
1684 struct sk_buff *skb2;
1687 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
1688 struct netlink_dump_control c = {
1689 .dump = nf_tables_dump_chains,
1690 .module = THIS_MODULE,
1693 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
1696 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask, 0);
1697 if (IS_ERR(table)) {
1698 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
1699 return PTR_ERR(table);
1702 chain = nft_chain_lookup(net, table, nla[NFTA_CHAIN_NAME], genmask);
1703 if (IS_ERR(chain)) {
1704 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
1705 return PTR_ERR(chain);
1708 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1712 err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
1713 info->nlh->nlmsg_seq, NFT_MSG_NEWCHAIN,
1714 0, family, table, chain);
1716 goto err_fill_chain_info;
1718 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
1720 err_fill_chain_info:
1725 static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
1726 [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 },
1727 [NFTA_COUNTER_BYTES] = { .type = NLA_U64 },
1730 static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
1732 struct nlattr *tb[NFTA_COUNTER_MAX+1];
1733 struct nft_stats __percpu *newstats;
1734 struct nft_stats *stats;
1737 err = nla_parse_nested_deprecated(tb, NFTA_COUNTER_MAX, attr,
1738 nft_counter_policy, NULL);
1740 return ERR_PTR(err);
1742 if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
1743 return ERR_PTR(-EINVAL);
1745 newstats = netdev_alloc_pcpu_stats(struct nft_stats);
1746 if (newstats == NULL)
1747 return ERR_PTR(-ENOMEM);
1749 /* Restore old counters on this cpu, no problem. Per-cpu statistics
1750 * are not exposed to userspace.
1753 stats = this_cpu_ptr(newstats);
1754 stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
1755 stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
1761 static void nft_chain_stats_replace(struct nft_trans *trans)
1763 struct nft_base_chain *chain = nft_base_chain(trans->ctx.chain);
1765 if (!nft_trans_chain_stats(trans))
1768 nft_trans_chain_stats(trans) =
1769 rcu_replace_pointer(chain->stats, nft_trans_chain_stats(trans),
1770 lockdep_commit_lock_is_held(trans->ctx.net));
1772 if (!nft_trans_chain_stats(trans))
1773 static_branch_inc(&nft_counters_enabled);
1776 static void nf_tables_chain_free_chain_rules(struct nft_chain *chain)
1778 struct nft_rule **g0 = rcu_dereference_raw(chain->rules_gen_0);
1779 struct nft_rule **g1 = rcu_dereference_raw(chain->rules_gen_1);
1785 /* should be NULL either via abort or via successful commit */
1786 WARN_ON_ONCE(chain->rules_next);
1787 kvfree(chain->rules_next);
1790 void nf_tables_chain_destroy(struct nft_ctx *ctx)
1792 struct nft_chain *chain = ctx->chain;
1793 struct nft_hook *hook, *next;
1795 if (WARN_ON(chain->use > 0))
1798 /* no concurrent access possible anymore */
1799 nf_tables_chain_free_chain_rules(chain);
1801 if (nft_is_base_chain(chain)) {
1802 struct nft_base_chain *basechain = nft_base_chain(chain);
1804 if (nft_base_chain_netdev(ctx->family, basechain->ops.hooknum)) {
1805 list_for_each_entry_safe(hook, next,
1806 &basechain->hook_list, list) {
1807 list_del_rcu(&hook->list);
1808 kfree_rcu(hook, rcu);
1811 module_put(basechain->type->owner);
1812 if (rcu_access_pointer(basechain->stats)) {
1813 static_branch_dec(&nft_counters_enabled);
1814 free_percpu(rcu_dereference_raw(basechain->stats));
1817 kfree(chain->udata);
1821 kfree(chain->udata);
1826 static struct nft_hook *nft_netdev_hook_alloc(struct net *net,
1827 const struct nlattr *attr)
1829 struct net_device *dev;
1830 char ifname[IFNAMSIZ];
1831 struct nft_hook *hook;
1834 hook = kmalloc(sizeof(struct nft_hook), GFP_KERNEL);
1837 goto err_hook_alloc;
1840 nla_strscpy(ifname, attr, IFNAMSIZ);
1841 /* nf_tables_netdev_event() is called under rtnl_mutex, this is
1842 * indirectly serializing all the other holders of the commit_mutex with
1845 dev = __dev_get_by_name(net, ifname);
1850 hook->ops.dev = dev;
1857 return ERR_PTR(err);
1860 static struct nft_hook *nft_hook_list_find(struct list_head *hook_list,
1861 const struct nft_hook *this)
1863 struct nft_hook *hook;
1865 list_for_each_entry(hook, hook_list, list) {
1866 if (this->ops.dev == hook->ops.dev)
1873 static int nf_tables_parse_netdev_hooks(struct net *net,
1874 const struct nlattr *attr,
1875 struct list_head *hook_list)
1877 struct nft_hook *hook, *next;
1878 const struct nlattr *tmp;
1879 int rem, n = 0, err;
1881 nla_for_each_nested(tmp, attr, rem) {
1882 if (nla_type(tmp) != NFTA_DEVICE_NAME) {
1887 hook = nft_netdev_hook_alloc(net, tmp);
1889 err = PTR_ERR(hook);
1892 if (nft_hook_list_find(hook_list, hook)) {
1897 list_add_tail(&hook->list, hook_list);
1900 if (n == NFT_NETDEVICE_MAX) {
1909 list_for_each_entry_safe(hook, next, hook_list, list) {
1910 list_del(&hook->list);
1916 struct nft_chain_hook {
1919 const struct nft_chain_type *type;
1920 struct list_head list;
1923 static int nft_chain_parse_netdev(struct net *net,
1924 struct nlattr *tb[],
1925 struct list_head *hook_list)
1927 struct nft_hook *hook;
1930 if (tb[NFTA_HOOK_DEV]) {
1931 hook = nft_netdev_hook_alloc(net, tb[NFTA_HOOK_DEV]);
1933 return PTR_ERR(hook);
1935 list_add_tail(&hook->list, hook_list);
1936 } else if (tb[NFTA_HOOK_DEVS]) {
1937 err = nf_tables_parse_netdev_hooks(net, tb[NFTA_HOOK_DEVS],
1942 if (list_empty(hook_list))
1951 static int nft_chain_parse_hook(struct net *net,
1952 const struct nlattr * const nla[],
1953 struct nft_chain_hook *hook, u8 family,
1954 struct netlink_ext_ack *extack, bool autoload)
1956 struct nftables_pernet *nft_net = nft_pernet(net);
1957 struct nlattr *ha[NFTA_HOOK_MAX + 1];
1958 const struct nft_chain_type *type;
1961 lockdep_assert_held(&nft_net->commit_mutex);
1962 lockdep_nfnl_nft_mutex_not_held();
1964 err = nla_parse_nested_deprecated(ha, NFTA_HOOK_MAX,
1965 nla[NFTA_CHAIN_HOOK],
1966 nft_hook_policy, NULL);
1970 if (ha[NFTA_HOOK_HOOKNUM] == NULL ||
1971 ha[NFTA_HOOK_PRIORITY] == NULL)
1974 hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
1975 hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
1977 type = __nft_chain_type_get(family, NFT_CHAIN_T_DEFAULT);
1981 if (nla[NFTA_CHAIN_TYPE]) {
1982 type = nf_tables_chain_type_lookup(net, nla[NFTA_CHAIN_TYPE],
1985 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
1986 return PTR_ERR(type);
1989 if (hook->num >= NFT_MAX_HOOKS || !(type->hook_mask & (1 << hook->num)))
1992 if (type->type == NFT_CHAIN_T_NAT &&
1993 hook->priority <= NF_IP_PRI_CONNTRACK)
1996 if (!try_module_get(type->owner)) {
1997 if (nla[NFTA_CHAIN_TYPE])
1998 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
2004 INIT_LIST_HEAD(&hook->list);
2005 if (nft_base_chain_netdev(family, hook->num)) {
2006 err = nft_chain_parse_netdev(net, ha, &hook->list);
2008 module_put(type->owner);
2011 } else if (ha[NFTA_HOOK_DEV] || ha[NFTA_HOOK_DEVS]) {
2012 module_put(type->owner);
2019 static void nft_chain_release_hook(struct nft_chain_hook *hook)
2021 struct nft_hook *h, *next;
2023 list_for_each_entry_safe(h, next, &hook->list, list) {
2027 module_put(hook->type->owner);
2030 struct nft_rules_old {
2032 struct nft_rule **start;
2035 static struct nft_rule **nf_tables_chain_alloc_rules(const struct nft_chain *chain,
2038 if (alloc > INT_MAX)
2041 alloc += 1; /* NULL, ends rules */
2042 if (sizeof(struct nft_rule *) > INT_MAX / alloc)
2045 alloc *= sizeof(struct nft_rule *);
2046 alloc += sizeof(struct nft_rules_old);
2048 return kvmalloc(alloc, GFP_KERNEL);
2051 static void nft_basechain_hook_init(struct nf_hook_ops *ops, u8 family,
2052 const struct nft_chain_hook *hook,
2053 struct nft_chain *chain)
2056 ops->hooknum = hook->num;
2057 ops->priority = hook->priority;
2059 ops->hook = hook->type->hooks[ops->hooknum];
2060 ops->hook_ops_type = NF_HOOK_OP_NF_TABLES;
2063 static int nft_basechain_init(struct nft_base_chain *basechain, u8 family,
2064 struct nft_chain_hook *hook, u32 flags)
2066 struct nft_chain *chain;
2069 basechain->type = hook->type;
2070 INIT_LIST_HEAD(&basechain->hook_list);
2071 chain = &basechain->chain;
2073 if (nft_base_chain_netdev(family, hook->num)) {
2074 list_splice_init(&hook->list, &basechain->hook_list);
2075 list_for_each_entry(h, &basechain->hook_list, list)
2076 nft_basechain_hook_init(&h->ops, family, hook, chain);
2078 basechain->ops.hooknum = hook->num;
2079 basechain->ops.priority = hook->priority;
2081 nft_basechain_hook_init(&basechain->ops, family, hook, chain);
2084 chain->flags |= NFT_CHAIN_BASE | flags;
2085 basechain->policy = NF_ACCEPT;
2086 if (chain->flags & NFT_CHAIN_HW_OFFLOAD &&
2087 !nft_chain_offload_support(basechain)) {
2088 list_splice_init(&basechain->hook_list, &hook->list);
2092 flow_block_init(&basechain->flow_block);
2097 static int nft_chain_add(struct nft_table *table, struct nft_chain *chain)
2101 err = rhltable_insert_key(&table->chains_ht, chain->name,
2102 &chain->rhlhead, nft_chain_ht_params);
2106 list_add_tail_rcu(&chain->list, &table->chains);
2111 static u64 chain_id;
2113 static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask,
2114 u8 policy, u32 flags,
2115 struct netlink_ext_ack *extack)
2117 const struct nlattr * const *nla = ctx->nla;
2118 struct nft_table *table = ctx->table;
2119 struct nft_base_chain *basechain;
2120 struct net *net = ctx->net;
2121 char name[NFT_NAME_MAXLEN];
2122 struct nft_trans *trans;
2123 struct nft_chain *chain;
2124 struct nft_rule **rules;
2127 if (table->use == UINT_MAX)
2130 if (nla[NFTA_CHAIN_HOOK]) {
2131 struct nft_stats __percpu *stats = NULL;
2132 struct nft_chain_hook hook;
2134 if (flags & NFT_CHAIN_BINDING)
2137 err = nft_chain_parse_hook(net, nla, &hook, family, extack,
2142 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL);
2143 if (basechain == NULL) {
2144 nft_chain_release_hook(&hook);
2147 chain = &basechain->chain;
2149 if (nla[NFTA_CHAIN_COUNTERS]) {
2150 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2151 if (IS_ERR(stats)) {
2152 nft_chain_release_hook(&hook);
2154 return PTR_ERR(stats);
2156 rcu_assign_pointer(basechain->stats, stats);
2159 err = nft_basechain_init(basechain, family, &hook, flags);
2161 nft_chain_release_hook(&hook);
2167 static_branch_inc(&nft_counters_enabled);
2169 if (flags & NFT_CHAIN_BASE)
2171 if (flags & NFT_CHAIN_HW_OFFLOAD)
2174 chain = kzalloc(sizeof(*chain), GFP_KERNEL);
2178 chain->flags = flags;
2182 INIT_LIST_HEAD(&chain->rules);
2183 chain->handle = nf_tables_alloc_handle(table);
2184 chain->table = table;
2186 if (nla[NFTA_CHAIN_NAME]) {
2187 chain->name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL);
2189 if (!(flags & NFT_CHAIN_BINDING)) {
2191 goto err_destroy_chain;
2194 snprintf(name, sizeof(name), "__chain%llu", ++chain_id);
2195 chain->name = kstrdup(name, GFP_KERNEL);
2200 goto err_destroy_chain;
2203 if (nla[NFTA_CHAIN_USERDATA]) {
2204 chain->udata = nla_memdup(nla[NFTA_CHAIN_USERDATA], GFP_KERNEL);
2205 if (chain->udata == NULL) {
2207 goto err_destroy_chain;
2209 chain->udlen = nla_len(nla[NFTA_CHAIN_USERDATA]);
2212 rules = nf_tables_chain_alloc_rules(chain, 0);
2215 goto err_destroy_chain;
2219 rcu_assign_pointer(chain->rules_gen_0, rules);
2220 rcu_assign_pointer(chain->rules_gen_1, rules);
2222 err = nf_tables_register_hook(net, table, chain);
2224 goto err_destroy_chain;
2226 trans = nft_trans_chain_add(ctx, NFT_MSG_NEWCHAIN);
2227 if (IS_ERR(trans)) {
2228 err = PTR_ERR(trans);
2229 goto err_unregister_hook;
2232 nft_trans_chain_policy(trans) = NFT_CHAIN_POLICY_UNSET;
2233 if (nft_is_base_chain(chain))
2234 nft_trans_chain_policy(trans) = policy;
2236 err = nft_chain_add(table, chain);
2238 nft_trans_destroy(trans);
2239 goto err_unregister_hook;
2245 err_unregister_hook:
2246 nf_tables_unregister_hook(net, table, chain);
2248 nf_tables_chain_destroy(ctx);
2253 static bool nft_hook_list_equal(struct list_head *hook_list1,
2254 struct list_head *hook_list2)
2256 struct nft_hook *hook;
2260 list_for_each_entry(hook, hook_list2, list) {
2261 if (!nft_hook_list_find(hook_list1, hook))
2266 list_for_each_entry(hook, hook_list1, list)
2272 static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
2273 u32 flags, const struct nlattr *attr,
2274 struct netlink_ext_ack *extack)
2276 const struct nlattr * const *nla = ctx->nla;
2277 struct nft_table *table = ctx->table;
2278 struct nft_chain *chain = ctx->chain;
2279 struct nft_base_chain *basechain;
2280 struct nft_stats *stats = NULL;
2281 struct nft_chain_hook hook;
2282 struct nf_hook_ops *ops;
2283 struct nft_trans *trans;
2286 if (chain->flags ^ flags)
2289 if (nla[NFTA_CHAIN_HOOK]) {
2290 if (!nft_is_base_chain(chain)) {
2291 NL_SET_BAD_ATTR(extack, attr);
2294 err = nft_chain_parse_hook(ctx->net, nla, &hook, ctx->family,
2299 basechain = nft_base_chain(chain);
2300 if (basechain->type != hook.type) {
2301 nft_chain_release_hook(&hook);
2302 NL_SET_BAD_ATTR(extack, attr);
2306 if (nft_base_chain_netdev(ctx->family, hook.num)) {
2307 if (!nft_hook_list_equal(&basechain->hook_list,
2309 nft_chain_release_hook(&hook);
2310 NL_SET_BAD_ATTR(extack, attr);
2314 ops = &basechain->ops;
2315 if (ops->hooknum != hook.num ||
2316 ops->priority != hook.priority) {
2317 nft_chain_release_hook(&hook);
2318 NL_SET_BAD_ATTR(extack, attr);
2322 nft_chain_release_hook(&hook);
2325 if (nla[NFTA_CHAIN_HANDLE] &&
2326 nla[NFTA_CHAIN_NAME]) {
2327 struct nft_chain *chain2;
2329 chain2 = nft_chain_lookup(ctx->net, table,
2330 nla[NFTA_CHAIN_NAME], genmask);
2331 if (!IS_ERR(chain2)) {
2332 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2337 if (nla[NFTA_CHAIN_COUNTERS]) {
2338 if (!nft_is_base_chain(chain))
2341 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2343 return PTR_ERR(stats);
2347 trans = nft_trans_alloc(ctx, NFT_MSG_NEWCHAIN,
2348 sizeof(struct nft_trans_chain));
2352 nft_trans_chain_stats(trans) = stats;
2353 nft_trans_chain_update(trans) = true;
2355 if (nla[NFTA_CHAIN_POLICY])
2356 nft_trans_chain_policy(trans) = policy;
2358 nft_trans_chain_policy(trans) = -1;
2360 if (nla[NFTA_CHAIN_HANDLE] &&
2361 nla[NFTA_CHAIN_NAME]) {
2362 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
2363 struct nft_trans *tmp;
2367 name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL);
2372 list_for_each_entry(tmp, &nft_net->commit_list, list) {
2373 if (tmp->msg_type == NFT_MSG_NEWCHAIN &&
2374 tmp->ctx.table == table &&
2375 nft_trans_chain_update(tmp) &&
2376 nft_trans_chain_name(tmp) &&
2377 strcmp(name, nft_trans_chain_name(tmp)) == 0) {
2378 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2384 nft_trans_chain_name(trans) = name;
2386 nft_trans_commit_list_add_tail(ctx->net, trans);
2395 static struct nft_chain *nft_chain_lookup_byid(const struct net *net,
2396 const struct nft_table *table,
2397 const struct nlattr *nla)
2399 struct nftables_pernet *nft_net = nft_pernet(net);
2400 u32 id = ntohl(nla_get_be32(nla));
2401 struct nft_trans *trans;
2403 list_for_each_entry(trans, &nft_net->commit_list, list) {
2404 struct nft_chain *chain = trans->ctx.chain;
2406 if (trans->msg_type == NFT_MSG_NEWCHAIN &&
2407 chain->table == table &&
2408 id == nft_trans_chain_id(trans))
2411 return ERR_PTR(-ENOENT);
2414 static int nf_tables_newchain(struct sk_buff *skb, const struct nfnl_info *info,
2415 const struct nlattr * const nla[])
2417 struct nftables_pernet *nft_net = nft_pernet(info->net);
2418 struct netlink_ext_ack *extack = info->extack;
2419 u8 genmask = nft_genmask_next(info->net);
2420 u8 family = info->nfmsg->nfgen_family;
2421 struct nft_chain *chain = NULL;
2422 struct net *net = info->net;
2423 const struct nlattr *attr;
2424 struct nft_table *table;
2425 u8 policy = NF_ACCEPT;
2430 lockdep_assert_held(&nft_net->commit_mutex);
2432 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2433 NETLINK_CB(skb).portid);
2434 if (IS_ERR(table)) {
2435 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2436 return PTR_ERR(table);
2440 attr = nla[NFTA_CHAIN_NAME];
2442 if (nla[NFTA_CHAIN_HANDLE]) {
2443 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
2444 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2445 if (IS_ERR(chain)) {
2446 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_HANDLE]);
2447 return PTR_ERR(chain);
2449 attr = nla[NFTA_CHAIN_HANDLE];
2450 } else if (nla[NFTA_CHAIN_NAME]) {
2451 chain = nft_chain_lookup(net, table, attr, genmask);
2452 if (IS_ERR(chain)) {
2453 if (PTR_ERR(chain) != -ENOENT) {
2454 NL_SET_BAD_ATTR(extack, attr);
2455 return PTR_ERR(chain);
2459 } else if (!nla[NFTA_CHAIN_ID]) {
2463 if (nla[NFTA_CHAIN_POLICY]) {
2464 if (chain != NULL &&
2465 !nft_is_base_chain(chain)) {
2466 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2470 if (chain == NULL &&
2471 nla[NFTA_CHAIN_HOOK] == NULL) {
2472 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2476 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
2486 if (nla[NFTA_CHAIN_FLAGS])
2487 flags = ntohl(nla_get_be32(nla[NFTA_CHAIN_FLAGS]));
2489 flags = chain->flags;
2491 if (flags & ~NFT_CHAIN_FLAGS)
2494 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
2496 if (chain != NULL) {
2497 if (chain->flags & NFT_CHAIN_BINDING)
2500 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
2501 NL_SET_BAD_ATTR(extack, attr);
2504 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
2507 flags |= chain->flags & NFT_CHAIN_BASE;
2508 return nf_tables_updchain(&ctx, genmask, policy, flags, attr,
2512 return nf_tables_addchain(&ctx, family, genmask, policy, flags, extack);
2515 static int nf_tables_delchain(struct sk_buff *skb, const struct nfnl_info *info,
2516 const struct nlattr * const nla[])
2518 struct netlink_ext_ack *extack = info->extack;
2519 u8 genmask = nft_genmask_next(info->net);
2520 u8 family = info->nfmsg->nfgen_family;
2521 struct net *net = info->net;
2522 const struct nlattr *attr;
2523 struct nft_table *table;
2524 struct nft_chain *chain;
2525 struct nft_rule *rule;
2531 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2532 NETLINK_CB(skb).portid);
2533 if (IS_ERR(table)) {
2534 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2535 return PTR_ERR(table);
2538 if (nla[NFTA_CHAIN_HANDLE]) {
2539 attr = nla[NFTA_CHAIN_HANDLE];
2540 handle = be64_to_cpu(nla_get_be64(attr));
2541 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2543 attr = nla[NFTA_CHAIN_NAME];
2544 chain = nft_chain_lookup(net, table, attr, genmask);
2546 if (IS_ERR(chain)) {
2547 NL_SET_BAD_ATTR(extack, attr);
2548 return PTR_ERR(chain);
2551 if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
2555 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
2558 list_for_each_entry(rule, &chain->rules, list) {
2559 if (!nft_is_active_next(net, rule))
2563 err = nft_delrule(&ctx, rule);
2568 /* There are rules and elements that are still holding references to us,
2569 * we cannot do a recursive removal in this case.
2572 NL_SET_BAD_ATTR(extack, attr);
2576 return nft_delchain(&ctx);
2584 * nft_register_expr - register nf_tables expr type
2587 * Registers the expr type for use with nf_tables. Returns zero on
2588 * success or a negative errno code otherwise.
2590 int nft_register_expr(struct nft_expr_type *type)
2592 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2593 if (type->family == NFPROTO_UNSPEC)
2594 list_add_tail_rcu(&type->list, &nf_tables_expressions);
2596 list_add_rcu(&type->list, &nf_tables_expressions);
2597 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2600 EXPORT_SYMBOL_GPL(nft_register_expr);
2603 * nft_unregister_expr - unregister nf_tables expr type
2606 * Unregisters the expr typefor use with nf_tables.
2608 void nft_unregister_expr(struct nft_expr_type *type)
2610 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2611 list_del_rcu(&type->list);
2612 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2614 EXPORT_SYMBOL_GPL(nft_unregister_expr);
2616 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
2619 const struct nft_expr_type *type, *candidate = NULL;
2621 list_for_each_entry(type, &nf_tables_expressions, list) {
2622 if (!nla_strcmp(nla, type->name)) {
2623 if (!type->family && !candidate)
2625 else if (type->family == family)
2632 #ifdef CONFIG_MODULES
2633 static int nft_expr_type_request_module(struct net *net, u8 family,
2636 if (nft_request_module(net, "nft-expr-%u-%.*s", family,
2637 nla_len(nla), (char *)nla_data(nla)) == -EAGAIN)
2644 static const struct nft_expr_type *nft_expr_type_get(struct net *net,
2648 const struct nft_expr_type *type;
2651 return ERR_PTR(-EINVAL);
2653 type = __nft_expr_type_get(family, nla);
2654 if (type != NULL && try_module_get(type->owner))
2657 lockdep_nfnl_nft_mutex_not_held();
2658 #ifdef CONFIG_MODULES
2660 if (nft_expr_type_request_module(net, family, nla) == -EAGAIN)
2661 return ERR_PTR(-EAGAIN);
2663 if (nft_request_module(net, "nft-expr-%.*s",
2665 (char *)nla_data(nla)) == -EAGAIN)
2666 return ERR_PTR(-EAGAIN);
2669 return ERR_PTR(-ENOENT);
2672 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
2673 [NFTA_EXPR_NAME] = { .type = NLA_STRING,
2674 .len = NFT_MODULE_AUTOLOAD_LIMIT },
2675 [NFTA_EXPR_DATA] = { .type = NLA_NESTED },
2678 static int nf_tables_fill_expr_info(struct sk_buff *skb,
2679 const struct nft_expr *expr)
2681 if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
2682 goto nla_put_failure;
2684 if (expr->ops->dump) {
2685 struct nlattr *data = nla_nest_start_noflag(skb,
2688 goto nla_put_failure;
2689 if (expr->ops->dump(skb, expr) < 0)
2690 goto nla_put_failure;
2691 nla_nest_end(skb, data);
2700 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
2701 const struct nft_expr *expr)
2703 struct nlattr *nest;
2705 nest = nla_nest_start_noflag(skb, attr);
2707 goto nla_put_failure;
2708 if (nf_tables_fill_expr_info(skb, expr) < 0)
2709 goto nla_put_failure;
2710 nla_nest_end(skb, nest);
2717 struct nft_expr_info {
2718 const struct nft_expr_ops *ops;
2719 const struct nlattr *attr;
2720 struct nlattr *tb[NFT_EXPR_MAXATTR + 1];
2723 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
2724 const struct nlattr *nla,
2725 struct nft_expr_info *info)
2727 const struct nft_expr_type *type;
2728 const struct nft_expr_ops *ops;
2729 struct nlattr *tb[NFTA_EXPR_MAX + 1];
2732 err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
2733 nft_expr_policy, NULL);
2737 type = nft_expr_type_get(ctx->net, ctx->family, tb[NFTA_EXPR_NAME]);
2739 return PTR_ERR(type);
2741 if (tb[NFTA_EXPR_DATA]) {
2742 err = nla_parse_nested_deprecated(info->tb, type->maxattr,
2744 type->policy, NULL);
2748 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
2750 if (type->select_ops != NULL) {
2751 ops = type->select_ops(ctx,
2752 (const struct nlattr * const *)info->tb);
2755 #ifdef CONFIG_MODULES
2757 if (nft_expr_type_request_module(ctx->net,
2759 tb[NFTA_EXPR_NAME]) != -EAGAIN)
2773 module_put(type->owner);
2777 static int nf_tables_newexpr(const struct nft_ctx *ctx,
2778 const struct nft_expr_info *expr_info,
2779 struct nft_expr *expr)
2781 const struct nft_expr_ops *ops = expr_info->ops;
2786 err = ops->init(ctx, expr, (const struct nlattr **)expr_info->tb);
2797 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
2798 struct nft_expr *expr)
2800 const struct nft_expr_type *type = expr->ops->type;
2802 if (expr->ops->destroy)
2803 expr->ops->destroy(ctx, expr);
2804 module_put(type->owner);
2807 static struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
2808 const struct nlattr *nla)
2810 struct nft_expr_info expr_info;
2811 struct nft_expr *expr;
2812 struct module *owner;
2815 err = nf_tables_expr_parse(ctx, nla, &expr_info);
2817 goto err_expr_parse;
2820 if (!(expr_info.ops->type->flags & NFT_EXPR_STATEFUL))
2821 goto err_expr_stateful;
2824 expr = kzalloc(expr_info.ops->size, GFP_KERNEL);
2826 goto err_expr_stateful;
2828 err = nf_tables_newexpr(ctx, &expr_info, expr);
2836 owner = expr_info.ops->type->owner;
2837 if (expr_info.ops->type->release_ops)
2838 expr_info.ops->type->release_ops(expr_info.ops);
2842 return ERR_PTR(err);
2845 int nft_expr_clone(struct nft_expr *dst, struct nft_expr *src)
2849 if (src->ops->clone) {
2850 dst->ops = src->ops;
2851 err = src->ops->clone(dst, src);
2855 memcpy(dst, src, src->ops->size);
2858 __module_get(src->ops->type->owner);
2863 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
2865 nf_tables_expr_destroy(ctx, expr);
2873 static struct nft_rule *__nft_rule_lookup(const struct nft_chain *chain,
2876 struct nft_rule *rule;
2878 // FIXME: this sucks
2879 list_for_each_entry_rcu(rule, &chain->rules, list) {
2880 if (handle == rule->handle)
2884 return ERR_PTR(-ENOENT);
2887 static struct nft_rule *nft_rule_lookup(const struct nft_chain *chain,
2888 const struct nlattr *nla)
2891 return ERR_PTR(-EINVAL);
2893 return __nft_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
2896 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
2897 [NFTA_RULE_TABLE] = { .type = NLA_STRING,
2898 .len = NFT_TABLE_MAXNAMELEN - 1 },
2899 [NFTA_RULE_CHAIN] = { .type = NLA_STRING,
2900 .len = NFT_CHAIN_MAXNAMELEN - 1 },
2901 [NFTA_RULE_HANDLE] = { .type = NLA_U64 },
2902 [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
2903 [NFTA_RULE_COMPAT] = { .type = NLA_NESTED },
2904 [NFTA_RULE_POSITION] = { .type = NLA_U64 },
2905 [NFTA_RULE_USERDATA] = { .type = NLA_BINARY,
2906 .len = NFT_USERDATA_MAXLEN },
2907 [NFTA_RULE_ID] = { .type = NLA_U32 },
2908 [NFTA_RULE_POSITION_ID] = { .type = NLA_U32 },
2909 [NFTA_RULE_CHAIN_ID] = { .type = NLA_U32 },
2912 static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
2913 u32 portid, u32 seq, int event,
2914 u32 flags, int family,
2915 const struct nft_table *table,
2916 const struct nft_chain *chain,
2917 const struct nft_rule *rule, u64 handle)
2919 struct nlmsghdr *nlh;
2920 const struct nft_expr *expr, *next;
2921 struct nlattr *list;
2922 u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
2924 nlh = nfnl_msg_put(skb, portid, seq, type, flags, family, NFNETLINK_V0,
2927 goto nla_put_failure;
2929 if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
2930 goto nla_put_failure;
2931 if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
2932 goto nla_put_failure;
2933 if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
2935 goto nla_put_failure;
2937 if (event != NFT_MSG_DELRULE && handle) {
2938 if (nla_put_be64(skb, NFTA_RULE_POSITION, cpu_to_be64(handle),
2940 goto nla_put_failure;
2943 if (chain->flags & NFT_CHAIN_HW_OFFLOAD)
2944 nft_flow_rule_stats(chain, rule);
2946 list = nla_nest_start_noflag(skb, NFTA_RULE_EXPRESSIONS);
2948 goto nla_put_failure;
2949 nft_rule_for_each_expr(expr, next, rule) {
2950 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
2951 goto nla_put_failure;
2953 nla_nest_end(skb, list);
2956 struct nft_userdata *udata = nft_userdata(rule);
2957 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
2959 goto nla_put_failure;
2962 nlmsg_end(skb, nlh);
2966 nlmsg_trim(skb, nlh);
2970 static void nf_tables_rule_notify(const struct nft_ctx *ctx,
2971 const struct nft_rule *rule, int event)
2973 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
2974 const struct nft_rule *prule;
2975 struct sk_buff *skb;
2981 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
2984 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
2988 if (event == NFT_MSG_NEWRULE &&
2989 !list_is_first(&rule->list, &ctx->chain->rules) &&
2990 !list_is_last(&rule->list, &ctx->chain->rules)) {
2991 prule = list_prev_entry(rule, list);
2992 handle = prule->handle;
2994 if (ctx->flags & (NLM_F_APPEND | NLM_F_REPLACE))
2995 flags |= NLM_F_APPEND;
2996 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
2997 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
2999 err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
3000 event, flags, ctx->family, ctx->table,
3001 ctx->chain, rule, handle);
3007 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
3010 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
3013 struct nft_rule_dump_ctx {
3018 static int __nf_tables_dump_rules(struct sk_buff *skb,
3020 struct netlink_callback *cb,
3021 const struct nft_table *table,
3022 const struct nft_chain *chain)
3024 struct net *net = sock_net(skb->sk);
3025 const struct nft_rule *rule, *prule;
3026 unsigned int s_idx = cb->args[0];
3030 list_for_each_entry_rcu(rule, &chain->rules, list) {
3031 if (!nft_is_active(net, rule))
3036 memset(&cb->args[1], 0,
3037 sizeof(cb->args) - sizeof(cb->args[0]));
3040 handle = prule->handle;
3044 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
3047 NLM_F_MULTI | NLM_F_APPEND,
3049 table, chain, rule, handle) < 0)
3052 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3061 static int nf_tables_dump_rules(struct sk_buff *skb,
3062 struct netlink_callback *cb)
3064 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
3065 const struct nft_rule_dump_ctx *ctx = cb->data;
3066 struct nft_table *table;
3067 const struct nft_chain *chain;
3068 unsigned int idx = 0;
3069 struct net *net = sock_net(skb->sk);
3070 int family = nfmsg->nfgen_family;
3071 struct nftables_pernet *nft_net;
3074 nft_net = nft_pernet(net);
3075 cb->seq = READ_ONCE(nft_net->base_seq);
3077 list_for_each_entry_rcu(table, &nft_net->tables, list) {
3078 if (family != NFPROTO_UNSPEC && family != table->family)
3081 if (ctx && ctx->table && strcmp(ctx->table, table->name) != 0)
3084 if (ctx && ctx->table && ctx->chain) {
3085 struct rhlist_head *list, *tmp;
3087 list = rhltable_lookup(&table->chains_ht, ctx->chain,
3088 nft_chain_ht_params);
3092 rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
3093 if (!nft_is_active(net, chain))
3095 __nf_tables_dump_rules(skb, &idx,
3102 list_for_each_entry_rcu(chain, &table->chains, list) {
3103 if (__nf_tables_dump_rules(skb, &idx, cb, table, chain))
3107 if (ctx && ctx->table)
3117 static int nf_tables_dump_rules_start(struct netlink_callback *cb)
3119 const struct nlattr * const *nla = cb->data;
3120 struct nft_rule_dump_ctx *ctx = NULL;
3122 if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) {
3123 ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
3127 if (nla[NFTA_RULE_TABLE]) {
3128 ctx->table = nla_strdup(nla[NFTA_RULE_TABLE],
3135 if (nla[NFTA_RULE_CHAIN]) {
3136 ctx->chain = nla_strdup(nla[NFTA_RULE_CHAIN],
3150 static int nf_tables_dump_rules_done(struct netlink_callback *cb)
3152 struct nft_rule_dump_ctx *ctx = cb->data;
3162 /* called with rcu_read_lock held */
3163 static int nf_tables_getrule(struct sk_buff *skb, const struct nfnl_info *info,
3164 const struct nlattr * const nla[])
3166 struct netlink_ext_ack *extack = info->extack;
3167 u8 genmask = nft_genmask_cur(info->net);
3168 u8 family = info->nfmsg->nfgen_family;
3169 const struct nft_chain *chain;
3170 const struct nft_rule *rule;
3171 struct net *net = info->net;
3172 struct nft_table *table;
3173 struct sk_buff *skb2;
3176 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
3177 struct netlink_dump_control c = {
3178 .start= nf_tables_dump_rules_start,
3179 .dump = nf_tables_dump_rules,
3180 .done = nf_tables_dump_rules_done,
3181 .module = THIS_MODULE,
3182 .data = (void *)nla,
3185 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
3188 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask, 0);
3189 if (IS_ERR(table)) {
3190 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3191 return PTR_ERR(table);
3194 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask);
3195 if (IS_ERR(chain)) {
3196 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3197 return PTR_ERR(chain);
3200 rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
3202 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3203 return PTR_ERR(rule);
3206 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
3210 err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
3211 info->nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
3212 family, table, chain, rule, 0);
3214 goto err_fill_rule_info;
3216 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
3223 static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
3224 struct nft_rule *rule)
3226 struct nft_expr *expr, *next;
3229 * Careful: some expressions might not be initialized in case this
3230 * is called on error from nf_tables_newrule().
3232 expr = nft_expr_first(rule);
3233 while (nft_expr_more(rule, expr)) {
3234 next = nft_expr_next(expr);
3235 nf_tables_expr_destroy(ctx, expr);
3241 void nf_tables_rule_release(const struct nft_ctx *ctx, struct nft_rule *rule)
3243 nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_RELEASE);
3244 nf_tables_rule_destroy(ctx, rule);
3247 int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain)
3249 struct nft_expr *expr, *last;
3250 const struct nft_data *data;
3251 struct nft_rule *rule;
3254 if (ctx->level == NFT_JUMP_STACK_SIZE)
3257 list_for_each_entry(rule, &chain->rules, list) {
3258 if (!nft_is_active_next(ctx->net, rule))
3261 nft_rule_for_each_expr(expr, last, rule) {
3262 if (!expr->ops->validate)
3265 err = expr->ops->validate(ctx, expr, &data);
3273 EXPORT_SYMBOL_GPL(nft_chain_validate);
3275 static int nft_table_validate(struct net *net, const struct nft_table *table)
3277 struct nft_chain *chain;
3278 struct nft_ctx ctx = {
3280 .family = table->family,
3284 list_for_each_entry(chain, &table->chains, list) {
3285 if (!nft_is_base_chain(chain))
3289 err = nft_chain_validate(&ctx, chain);
3297 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3298 const struct nft_chain *chain,
3299 const struct nlattr *nla);
3301 #define NFT_RULE_MAXEXPRS 128
3303 static int nf_tables_newrule(struct sk_buff *skb, const struct nfnl_info *info,
3304 const struct nlattr * const nla[])
3306 struct nftables_pernet *nft_net = nft_pernet(info->net);
3307 struct netlink_ext_ack *extack = info->extack;
3308 unsigned int size, i, n, ulen = 0, usize = 0;
3309 u8 genmask = nft_genmask_next(info->net);
3310 struct nft_rule *rule, *old_rule = NULL;
3311 struct nft_expr_info *expr_info = NULL;
3312 u8 family = info->nfmsg->nfgen_family;
3313 struct nft_flow_rule *flow = NULL;
3314 struct net *net = info->net;
3315 struct nft_userdata *udata;
3316 struct nft_table *table;
3317 struct nft_chain *chain;
3318 struct nft_trans *trans;
3319 u64 handle, pos_handle;
3320 struct nft_expr *expr;
3325 lockdep_assert_held(&nft_net->commit_mutex);
3327 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
3328 NETLINK_CB(skb).portid);
3329 if (IS_ERR(table)) {
3330 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3331 return PTR_ERR(table);
3334 if (nla[NFTA_RULE_CHAIN]) {
3335 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3337 if (IS_ERR(chain)) {
3338 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3339 return PTR_ERR(chain);
3341 if (nft_chain_is_bound(chain))
3344 } else if (nla[NFTA_RULE_CHAIN_ID]) {
3345 chain = nft_chain_lookup_byid(net, table, nla[NFTA_RULE_CHAIN_ID]);
3346 if (IS_ERR(chain)) {
3347 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN_ID]);
3348 return PTR_ERR(chain);
3354 if (nla[NFTA_RULE_HANDLE]) {
3355 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
3356 rule = __nft_rule_lookup(chain, handle);
3358 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3359 return PTR_ERR(rule);
3362 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
3363 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3366 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
3371 if (!(info->nlh->nlmsg_flags & NLM_F_CREATE) ||
3372 info->nlh->nlmsg_flags & NLM_F_REPLACE)
3374 handle = nf_tables_alloc_handle(table);
3376 if (chain->use == UINT_MAX)
3379 if (nla[NFTA_RULE_POSITION]) {
3380 pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
3381 old_rule = __nft_rule_lookup(chain, pos_handle);
3382 if (IS_ERR(old_rule)) {
3383 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION]);
3384 return PTR_ERR(old_rule);
3386 } else if (nla[NFTA_RULE_POSITION_ID]) {
3387 old_rule = nft_rule_lookup_byid(net, chain, nla[NFTA_RULE_POSITION_ID]);
3388 if (IS_ERR(old_rule)) {
3389 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION_ID]);
3390 return PTR_ERR(old_rule);
3395 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
3399 if (nla[NFTA_RULE_EXPRESSIONS]) {
3400 expr_info = kvmalloc_array(NFT_RULE_MAXEXPRS,
3401 sizeof(struct nft_expr_info),
3406 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
3408 if (nla_type(tmp) != NFTA_LIST_ELEM)
3409 goto err_release_expr;
3410 if (n == NFT_RULE_MAXEXPRS)
3411 goto err_release_expr;
3412 err = nf_tables_expr_parse(&ctx, tmp, &expr_info[n]);
3414 NL_SET_BAD_ATTR(extack, tmp);
3415 goto err_release_expr;
3417 size += expr_info[n].ops->size;
3421 /* Check for overflow of dlen field */
3423 if (size >= 1 << 12)
3424 goto err_release_expr;
3426 if (nla[NFTA_RULE_USERDATA]) {
3427 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
3429 usize = sizeof(struct nft_userdata) + ulen;
3433 rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL);
3435 goto err_release_expr;
3437 nft_activate_next(net, rule);
3439 rule->handle = handle;
3441 rule->udata = ulen ? 1 : 0;
3444 udata = nft_userdata(rule);
3445 udata->len = ulen - 1;
3446 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
3449 expr = nft_expr_first(rule);
3450 for (i = 0; i < n; i++) {
3451 err = nf_tables_newexpr(&ctx, &expr_info[i], expr);
3453 NL_SET_BAD_ATTR(extack, expr_info[i].attr);
3454 goto err_release_rule;
3457 if (expr_info[i].ops->validate)
3458 nft_validate_state_update(net, NFT_VALIDATE_NEED);
3460 expr_info[i].ops = NULL;
3461 expr = nft_expr_next(expr);
3464 if (chain->flags & NFT_CHAIN_HW_OFFLOAD) {
3465 flow = nft_flow_rule_create(net, rule);
3467 err = PTR_ERR(flow);
3468 goto err_release_rule;
3472 if (info->nlh->nlmsg_flags & NLM_F_REPLACE) {
3473 err = nft_delrule(&ctx, old_rule);
3475 goto err_destroy_flow_rule;
3477 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
3478 if (trans == NULL) {
3480 goto err_destroy_flow_rule;
3482 list_add_tail_rcu(&rule->list, &old_rule->list);
3484 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
3487 goto err_destroy_flow_rule;
3490 if (info->nlh->nlmsg_flags & NLM_F_APPEND) {
3492 list_add_rcu(&rule->list, &old_rule->list);
3494 list_add_tail_rcu(&rule->list, &chain->rules);
3497 list_add_tail_rcu(&rule->list, &old_rule->list);
3499 list_add_rcu(&rule->list, &chain->rules);
3506 nft_trans_flow_rule(trans) = flow;
3508 if (nft_net->validate_state == NFT_VALIDATE_DO)
3509 return nft_table_validate(net, table);
3513 err_destroy_flow_rule:
3515 nft_flow_rule_destroy(flow);
3517 nf_tables_rule_release(&ctx, rule);
3519 for (i = 0; i < n; i++) {
3520 if (expr_info[i].ops) {
3521 module_put(expr_info[i].ops->type->owner);
3522 if (expr_info[i].ops->type->release_ops)
3523 expr_info[i].ops->type->release_ops(expr_info[i].ops);
3531 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3532 const struct nft_chain *chain,
3533 const struct nlattr *nla)
3535 struct nftables_pernet *nft_net = nft_pernet(net);
3536 u32 id = ntohl(nla_get_be32(nla));
3537 struct nft_trans *trans;
3539 list_for_each_entry(trans, &nft_net->commit_list, list) {
3540 struct nft_rule *rule = nft_trans_rule(trans);
3542 if (trans->msg_type == NFT_MSG_NEWRULE &&
3543 trans->ctx.chain == chain &&
3544 id == nft_trans_rule_id(trans))
3547 return ERR_PTR(-ENOENT);
3550 static int nf_tables_delrule(struct sk_buff *skb, const struct nfnl_info *info,
3551 const struct nlattr * const nla[])
3553 struct netlink_ext_ack *extack = info->extack;
3554 u8 genmask = nft_genmask_next(info->net);
3555 u8 family = info->nfmsg->nfgen_family;
3556 struct nft_chain *chain = NULL;
3557 struct net *net = info->net;
3558 struct nft_table *table;
3559 struct nft_rule *rule;
3563 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
3564 NETLINK_CB(skb).portid);
3565 if (IS_ERR(table)) {
3566 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3567 return PTR_ERR(table);
3570 if (nla[NFTA_RULE_CHAIN]) {
3571 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3573 if (IS_ERR(chain)) {
3574 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3575 return PTR_ERR(chain);
3577 if (nft_chain_is_bound(chain))
3581 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
3584 if (nla[NFTA_RULE_HANDLE]) {
3585 rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
3587 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3588 return PTR_ERR(rule);
3591 err = nft_delrule(&ctx, rule);
3592 } else if (nla[NFTA_RULE_ID]) {
3593 rule = nft_rule_lookup_byid(net, chain, nla[NFTA_RULE_ID]);
3595 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_ID]);
3596 return PTR_ERR(rule);
3599 err = nft_delrule(&ctx, rule);
3601 err = nft_delrule_by_chain(&ctx);
3604 list_for_each_entry(chain, &table->chains, list) {
3605 if (!nft_is_active_next(net, chain))
3609 err = nft_delrule_by_chain(&ctx);
3621 static const struct nft_set_type *nft_set_types[] = {
3622 &nft_set_hash_fast_type,
3624 &nft_set_rhash_type,
3625 &nft_set_bitmap_type,
3626 &nft_set_rbtree_type,
3627 #if defined(CONFIG_X86_64) && !defined(CONFIG_UML)
3628 &nft_set_pipapo_avx2_type,
3630 &nft_set_pipapo_type,
3633 #define NFT_SET_FEATURES (NFT_SET_INTERVAL | NFT_SET_MAP | \
3634 NFT_SET_TIMEOUT | NFT_SET_OBJECT | \
3637 static bool nft_set_ops_candidate(const struct nft_set_type *type, u32 flags)
3639 return (flags & type->features) == (flags & NFT_SET_FEATURES);
3643 * Select a set implementation based on the data characteristics and the
3644 * given policy. The total memory use might not be known if no size is
3645 * given, in that case the amount of memory per element is used.
3647 static const struct nft_set_ops *
3648 nft_select_set_ops(const struct nft_ctx *ctx,
3649 const struct nlattr * const nla[],
3650 const struct nft_set_desc *desc)
3652 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
3653 const struct nft_set_ops *ops, *bops;
3654 struct nft_set_estimate est, best;
3655 const struct nft_set_type *type;
3659 lockdep_assert_held(&nft_net->commit_mutex);
3660 lockdep_nfnl_nft_mutex_not_held();
3662 if (nla[NFTA_SET_FLAGS] != NULL)
3663 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
3670 for (i = 0; i < ARRAY_SIZE(nft_set_types); i++) {
3671 type = nft_set_types[i];
3674 if (!nft_set_ops_candidate(type, flags))
3676 if (!ops->estimate(desc, flags, &est))
3679 switch (desc->policy) {
3680 case NFT_SET_POL_PERFORMANCE:
3681 if (est.lookup < best.lookup)
3683 if (est.lookup == best.lookup &&
3684 est.space < best.space)
3687 case NFT_SET_POL_MEMORY:
3689 if (est.space < best.space)
3691 if (est.space == best.space &&
3692 est.lookup < best.lookup)
3694 } else if (est.size < best.size || !bops) {
3709 return ERR_PTR(-EOPNOTSUPP);
3712 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
3713 [NFTA_SET_TABLE] = { .type = NLA_STRING,
3714 .len = NFT_TABLE_MAXNAMELEN - 1 },
3715 [NFTA_SET_NAME] = { .type = NLA_STRING,
3716 .len = NFT_SET_MAXNAMELEN - 1 },
3717 [NFTA_SET_FLAGS] = { .type = NLA_U32 },
3718 [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 },
3719 [NFTA_SET_KEY_LEN] = { .type = NLA_U32 },
3720 [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 },
3721 [NFTA_SET_DATA_LEN] = { .type = NLA_U32 },
3722 [NFTA_SET_POLICY] = { .type = NLA_U32 },
3723 [NFTA_SET_DESC] = { .type = NLA_NESTED },
3724 [NFTA_SET_ID] = { .type = NLA_U32 },
3725 [NFTA_SET_TIMEOUT] = { .type = NLA_U64 },
3726 [NFTA_SET_GC_INTERVAL] = { .type = NLA_U32 },
3727 [NFTA_SET_USERDATA] = { .type = NLA_BINARY,
3728 .len = NFT_USERDATA_MAXLEN },
3729 [NFTA_SET_OBJ_TYPE] = { .type = NLA_U32 },
3730 [NFTA_SET_HANDLE] = { .type = NLA_U64 },
3731 [NFTA_SET_EXPR] = { .type = NLA_NESTED },
3732 [NFTA_SET_EXPRESSIONS] = { .type = NLA_NESTED },
3735 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
3736 [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 },
3737 [NFTA_SET_DESC_CONCAT] = { .type = NLA_NESTED },
3740 static struct nft_set *nft_set_lookup(const struct nft_table *table,
3741 const struct nlattr *nla, u8 genmask)
3743 struct nft_set *set;
3746 return ERR_PTR(-EINVAL);
3748 list_for_each_entry_rcu(set, &table->sets, list) {
3749 if (!nla_strcmp(nla, set->name) &&
3750 nft_active_genmask(set, genmask))
3753 return ERR_PTR(-ENOENT);
3756 static struct nft_set *nft_set_lookup_byhandle(const struct nft_table *table,
3757 const struct nlattr *nla,
3760 struct nft_set *set;
3762 list_for_each_entry(set, &table->sets, list) {
3763 if (be64_to_cpu(nla_get_be64(nla)) == set->handle &&
3764 nft_active_genmask(set, genmask))
3767 return ERR_PTR(-ENOENT);
3770 static struct nft_set *nft_set_lookup_byid(const struct net *net,
3771 const struct nft_table *table,
3772 const struct nlattr *nla, u8 genmask)
3774 struct nftables_pernet *nft_net = nft_pernet(net);
3775 u32 id = ntohl(nla_get_be32(nla));
3776 struct nft_trans *trans;
3778 list_for_each_entry(trans, &nft_net->commit_list, list) {
3779 if (trans->msg_type == NFT_MSG_NEWSET) {
3780 struct nft_set *set = nft_trans_set(trans);
3782 if (id == nft_trans_set_id(trans) &&
3783 set->table == table &&
3784 nft_active_genmask(set, genmask))
3788 return ERR_PTR(-ENOENT);
3791 struct nft_set *nft_set_lookup_global(const struct net *net,
3792 const struct nft_table *table,
3793 const struct nlattr *nla_set_name,
3794 const struct nlattr *nla_set_id,
3797 struct nft_set *set;
3799 set = nft_set_lookup(table, nla_set_name, genmask);
3804 set = nft_set_lookup_byid(net, table, nla_set_id, genmask);
3808 EXPORT_SYMBOL_GPL(nft_set_lookup_global);
3810 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
3813 const struct nft_set *i;
3815 unsigned long *inuse;
3816 unsigned int n = 0, min = 0;
3818 p = strchr(name, '%');
3820 if (p[1] != 'd' || strchr(p + 2, '%'))
3823 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
3827 list_for_each_entry(i, &ctx->table->sets, list) {
3830 if (!nft_is_active_next(ctx->net, i))
3832 if (!sscanf(i->name, name, &tmp))
3834 if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
3837 set_bit(tmp - min, inuse);
3840 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
3841 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
3842 min += BITS_PER_BYTE * PAGE_SIZE;
3843 memset(inuse, 0, PAGE_SIZE);
3846 free_page((unsigned long)inuse);
3849 set->name = kasprintf(GFP_KERNEL, name, min + n);
3853 list_for_each_entry(i, &ctx->table->sets, list) {
3854 if (!nft_is_active_next(ctx->net, i))
3856 if (!strcmp(set->name, i->name)) {
3865 int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result)
3867 u64 ms = be64_to_cpu(nla_get_be64(nla));
3868 u64 max = (u64)(~((u64)0));
3870 max = div_u64(max, NSEC_PER_MSEC);
3874 ms *= NSEC_PER_MSEC;
3875 *result = nsecs_to_jiffies64(ms);
3879 __be64 nf_jiffies64_to_msecs(u64 input)
3881 return cpu_to_be64(jiffies64_to_msecs(input));
3884 static int nf_tables_fill_set_concat(struct sk_buff *skb,
3885 const struct nft_set *set)
3887 struct nlattr *concat, *field;
3890 concat = nla_nest_start_noflag(skb, NFTA_SET_DESC_CONCAT);
3894 for (i = 0; i < set->field_count; i++) {
3895 field = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
3899 if (nla_put_be32(skb, NFTA_SET_FIELD_LEN,
3900 htonl(set->field_len[i])))
3903 nla_nest_end(skb, field);
3906 nla_nest_end(skb, concat);
3911 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
3912 const struct nft_set *set, u16 event, u16 flags)
3914 u64 timeout = READ_ONCE(set->timeout);
3915 u32 gc_int = READ_ONCE(set->gc_int);
3916 u32 portid = ctx->portid;
3917 struct nlmsghdr *nlh;
3918 struct nlattr *nest;
3922 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
3923 nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
3924 NFNETLINK_V0, nft_base_seq(ctx->net));
3926 goto nla_put_failure;
3928 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
3929 goto nla_put_failure;
3930 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
3931 goto nla_put_failure;
3932 if (nla_put_be64(skb, NFTA_SET_HANDLE, cpu_to_be64(set->handle),
3934 goto nla_put_failure;
3935 if (set->flags != 0)
3936 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
3937 goto nla_put_failure;
3939 if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
3940 goto nla_put_failure;
3941 if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
3942 goto nla_put_failure;
3943 if (set->flags & NFT_SET_MAP) {
3944 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
3945 goto nla_put_failure;
3946 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
3947 goto nla_put_failure;
3949 if (set->flags & NFT_SET_OBJECT &&
3950 nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
3951 goto nla_put_failure;
3954 nla_put_be64(skb, NFTA_SET_TIMEOUT,
3955 nf_jiffies64_to_msecs(timeout),
3957 goto nla_put_failure;
3959 nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(gc_int)))
3960 goto nla_put_failure;
3962 if (set->policy != NFT_SET_POL_PERFORMANCE) {
3963 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
3964 goto nla_put_failure;
3968 nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
3969 goto nla_put_failure;
3971 nest = nla_nest_start_noflag(skb, NFTA_SET_DESC);
3973 goto nla_put_failure;
3975 nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
3976 goto nla_put_failure;
3978 if (set->field_count > 1 &&
3979 nf_tables_fill_set_concat(skb, set))
3980 goto nla_put_failure;
3982 nla_nest_end(skb, nest);
3984 if (set->num_exprs == 1) {
3985 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPR);
3986 if (nf_tables_fill_expr_info(skb, set->exprs[0]) < 0)
3987 goto nla_put_failure;
3989 nla_nest_end(skb, nest);
3990 } else if (set->num_exprs > 1) {
3991 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPRESSIONS);
3993 goto nla_put_failure;
3995 for (i = 0; i < set->num_exprs; i++) {
3996 if (nft_expr_dump(skb, NFTA_LIST_ELEM,
3998 goto nla_put_failure;
4000 nla_nest_end(skb, nest);
4003 nlmsg_end(skb, nlh);
4007 nlmsg_trim(skb, nlh);
4011 static void nf_tables_set_notify(const struct nft_ctx *ctx,
4012 const struct nft_set *set, int event,
4015 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
4016 u32 portid = ctx->portid;
4017 struct sk_buff *skb;
4022 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
4025 skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
4029 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
4030 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
4032 err = nf_tables_fill_set(skb, ctx, set, event, flags);
4038 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
4041 nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
4044 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
4046 const struct nft_set *set;
4047 unsigned int idx, s_idx = cb->args[0];
4048 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
4049 struct net *net = sock_net(skb->sk);
4050 struct nft_ctx *ctx = cb->data, ctx_set;
4051 struct nftables_pernet *nft_net;
4057 nft_net = nft_pernet(net);
4058 cb->seq = READ_ONCE(nft_net->base_seq);
4060 list_for_each_entry_rcu(table, &nft_net->tables, list) {
4061 if (ctx->family != NFPROTO_UNSPEC &&
4062 ctx->family != table->family)
4065 if (ctx->table && ctx->table != table)
4069 if (cur_table != table)
4075 list_for_each_entry_rcu(set, &table->sets, list) {
4078 if (!nft_is_active(net, set))
4082 ctx_set.table = table;
4083 ctx_set.family = table->family;
4085 if (nf_tables_fill_set(skb, &ctx_set, set,
4089 cb->args[2] = (unsigned long) table;
4092 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4105 static int nf_tables_dump_sets_start(struct netlink_callback *cb)
4107 struct nft_ctx *ctx_dump = NULL;
4109 ctx_dump = kmemdup(cb->data, sizeof(*ctx_dump), GFP_ATOMIC);
4110 if (ctx_dump == NULL)
4113 cb->data = ctx_dump;
4117 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
4123 /* called with rcu_read_lock held */
4124 static int nf_tables_getset(struct sk_buff *skb, const struct nfnl_info *info,
4125 const struct nlattr * const nla[])
4127 struct netlink_ext_ack *extack = info->extack;
4128 u8 genmask = nft_genmask_cur(info->net);
4129 u8 family = info->nfmsg->nfgen_family;
4130 struct nft_table *table = NULL;
4131 struct net *net = info->net;
4132 const struct nft_set *set;
4133 struct sk_buff *skb2;
4137 if (nla[NFTA_SET_TABLE]) {
4138 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
4140 if (IS_ERR(table)) {
4141 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4142 return PTR_ERR(table);
4146 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4148 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
4149 struct netlink_dump_control c = {
4150 .start = nf_tables_dump_sets_start,
4151 .dump = nf_tables_dump_sets,
4152 .done = nf_tables_dump_sets_done,
4154 .module = THIS_MODULE,
4157 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
4160 /* Only accept unspec with dump */
4161 if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
4162 return -EAFNOSUPPORT;
4163 if (!nla[NFTA_SET_TABLE])
4166 set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
4168 return PTR_ERR(set);
4170 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
4174 err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
4176 goto err_fill_set_info;
4178 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
4185 static const struct nla_policy nft_concat_policy[NFTA_SET_FIELD_MAX + 1] = {
4186 [NFTA_SET_FIELD_LEN] = { .type = NLA_U32 },
4189 static int nft_set_desc_concat_parse(const struct nlattr *attr,
4190 struct nft_set_desc *desc)
4192 struct nlattr *tb[NFTA_SET_FIELD_MAX + 1];
4196 if (desc->field_count >= ARRAY_SIZE(desc->field_len))
4199 err = nla_parse_nested_deprecated(tb, NFTA_SET_FIELD_MAX, attr,
4200 nft_concat_policy, NULL);
4204 if (!tb[NFTA_SET_FIELD_LEN])
4207 len = ntohl(nla_get_be32(tb[NFTA_SET_FIELD_LEN]));
4208 if (!len || len > U8_MAX)
4211 desc->field_len[desc->field_count++] = len;
4216 static int nft_set_desc_concat(struct nft_set_desc *desc,
4217 const struct nlattr *nla)
4219 struct nlattr *attr;
4223 nla_for_each_nested(attr, nla, rem) {
4224 if (nla_type(attr) != NFTA_LIST_ELEM)
4227 err = nft_set_desc_concat_parse(attr, desc);
4232 for (i = 0; i < desc->field_count; i++)
4233 num_regs += DIV_ROUND_UP(desc->field_len[i], sizeof(u32));
4235 if (num_regs > NFT_REG32_COUNT)
4241 static int nf_tables_set_desc_parse(struct nft_set_desc *desc,
4242 const struct nlattr *nla)
4244 struct nlattr *da[NFTA_SET_DESC_MAX + 1];
4247 err = nla_parse_nested_deprecated(da, NFTA_SET_DESC_MAX, nla,
4248 nft_set_desc_policy, NULL);
4252 if (da[NFTA_SET_DESC_SIZE] != NULL)
4253 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
4254 if (da[NFTA_SET_DESC_CONCAT])
4255 err = nft_set_desc_concat(desc, da[NFTA_SET_DESC_CONCAT]);
4260 static int nft_set_expr_alloc(struct nft_ctx *ctx, struct nft_set *set,
4261 const struct nlattr * const *nla,
4262 struct nft_expr **exprs, int *num_exprs,
4265 struct nft_expr *expr;
4268 if (nla[NFTA_SET_EXPR]) {
4269 expr = nft_set_elem_expr_alloc(ctx, set, nla[NFTA_SET_EXPR]);
4271 err = PTR_ERR(expr);
4272 goto err_set_expr_alloc;
4276 } else if (nla[NFTA_SET_EXPRESSIONS]) {
4280 if (!(flags & NFT_SET_EXPR)) {
4282 goto err_set_expr_alloc;
4285 nla_for_each_nested(tmp, nla[NFTA_SET_EXPRESSIONS], left) {
4286 if (i == NFT_SET_EXPR_MAX) {
4288 goto err_set_expr_alloc;
4290 if (nla_type(tmp) != NFTA_LIST_ELEM) {
4292 goto err_set_expr_alloc;
4294 expr = nft_set_elem_expr_alloc(ctx, set, tmp);
4296 err = PTR_ERR(expr);
4297 goto err_set_expr_alloc;
4307 for (i = 0; i < *num_exprs; i++)
4308 nft_expr_destroy(ctx, exprs[i]);
4313 static bool nft_set_is_same(const struct nft_set *set,
4314 const struct nft_set_desc *desc,
4315 struct nft_expr *exprs[], u32 num_exprs, u32 flags)
4319 if (set->ktype != desc->ktype ||
4320 set->dtype != desc->dtype ||
4321 set->flags != flags ||
4322 set->klen != desc->klen ||
4323 set->dlen != desc->dlen ||
4324 set->field_count != desc->field_count ||
4325 set->num_exprs != num_exprs)
4328 for (i = 0; i < desc->field_count; i++) {
4329 if (set->field_len[i] != desc->field_len[i])
4333 for (i = 0; i < num_exprs; i++) {
4334 if (set->exprs[i]->ops != exprs[i]->ops)
4341 static int nf_tables_newset(struct sk_buff *skb, const struct nfnl_info *info,
4342 const struct nlattr * const nla[])
4344 struct netlink_ext_ack *extack = info->extack;
4345 u8 genmask = nft_genmask_next(info->net);
4346 u8 family = info->nfmsg->nfgen_family;
4347 const struct nft_set_ops *ops;
4348 struct net *net = info->net;
4349 struct nft_set_desc desc;
4350 struct nft_table *table;
4351 unsigned char *udata;
4352 struct nft_set *set;
4362 if (nla[NFTA_SET_TABLE] == NULL ||
4363 nla[NFTA_SET_NAME] == NULL ||
4364 nla[NFTA_SET_KEY_LEN] == NULL ||
4365 nla[NFTA_SET_ID] == NULL)
4368 memset(&desc, 0, sizeof(desc));
4370 desc.ktype = NFT_DATA_VALUE;
4371 if (nla[NFTA_SET_KEY_TYPE] != NULL) {
4372 desc.ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
4373 if ((desc.ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
4377 desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
4378 if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
4382 if (nla[NFTA_SET_FLAGS] != NULL) {
4383 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
4384 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
4385 NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
4386 NFT_SET_MAP | NFT_SET_EVAL |
4387 NFT_SET_OBJECT | NFT_SET_CONCAT | NFT_SET_EXPR))
4389 /* Only one of these operations is supported */
4390 if ((flags & (NFT_SET_MAP | NFT_SET_OBJECT)) ==
4391 (NFT_SET_MAP | NFT_SET_OBJECT))
4393 if ((flags & (NFT_SET_EVAL | NFT_SET_OBJECT)) ==
4394 (NFT_SET_EVAL | NFT_SET_OBJECT))
4399 if (nla[NFTA_SET_DATA_TYPE] != NULL) {
4400 if (!(flags & NFT_SET_MAP))
4403 desc.dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
4404 if ((desc.dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
4405 desc.dtype != NFT_DATA_VERDICT)
4408 if (desc.dtype != NFT_DATA_VERDICT) {
4409 if (nla[NFTA_SET_DATA_LEN] == NULL)
4411 desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
4412 if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
4415 desc.dlen = sizeof(struct nft_verdict);
4416 } else if (flags & NFT_SET_MAP)
4419 if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
4420 if (!(flags & NFT_SET_OBJECT))
4423 desc.objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
4424 if (desc.objtype == NFT_OBJECT_UNSPEC ||
4425 desc.objtype > NFT_OBJECT_MAX)
4427 } else if (flags & NFT_SET_OBJECT)
4430 desc.objtype = NFT_OBJECT_UNSPEC;
4433 if (nla[NFTA_SET_TIMEOUT] != NULL) {
4434 if (!(flags & NFT_SET_TIMEOUT))
4437 err = nf_msecs_to_jiffies64(nla[NFTA_SET_TIMEOUT], &desc.timeout);
4442 if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
4443 if (!(flags & NFT_SET_TIMEOUT))
4445 desc.gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
4448 desc.policy = NFT_SET_POL_PERFORMANCE;
4449 if (nla[NFTA_SET_POLICY] != NULL)
4450 desc.policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
4452 if (nla[NFTA_SET_DESC] != NULL) {
4453 err = nf_tables_set_desc_parse(&desc, nla[NFTA_SET_DESC]);
4457 if (desc.field_count > 1 && !(flags & NFT_SET_CONCAT))
4459 } else if (flags & NFT_SET_CONCAT) {
4463 if (nla[NFTA_SET_EXPR] || nla[NFTA_SET_EXPRESSIONS])
4466 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, genmask,
4467 NETLINK_CB(skb).portid);
4468 if (IS_ERR(table)) {
4469 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4470 return PTR_ERR(table);
4473 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4475 set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
4477 if (PTR_ERR(set) != -ENOENT) {
4478 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4479 return PTR_ERR(set);
4482 struct nft_expr *exprs[NFT_SET_EXPR_MAX] = {};
4484 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
4485 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4488 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
4491 err = nft_set_expr_alloc(&ctx, set, nla, exprs, &num_exprs, flags);
4496 if (!nft_set_is_same(set, &desc, exprs, num_exprs, flags)) {
4497 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4501 for (i = 0; i < num_exprs; i++)
4502 nft_expr_destroy(&ctx, exprs[i]);
4507 return __nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set, &desc);
4510 if (!(info->nlh->nlmsg_flags & NLM_F_CREATE))
4513 ops = nft_select_set_ops(&ctx, nla, &desc);
4515 return PTR_ERR(ops);
4518 if (nla[NFTA_SET_USERDATA])
4519 udlen = nla_len(nla[NFTA_SET_USERDATA]);
4522 if (ops->privsize != NULL)
4523 size = ops->privsize(nla, &desc);
4524 alloc_size = sizeof(*set) + size + udlen;
4525 if (alloc_size < size || alloc_size > INT_MAX)
4527 set = kvzalloc(alloc_size, GFP_KERNEL);
4531 name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL);
4537 err = nf_tables_set_alloc_name(&ctx, set, name);
4544 udata = set->data + size;
4545 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
4548 INIT_LIST_HEAD(&set->bindings);
4549 INIT_LIST_HEAD(&set->catchall_list);
4551 write_pnet(&set->net, net);
4553 set->ktype = desc.ktype;
4554 set->klen = desc.klen;
4555 set->dtype = desc.dtype;
4556 set->objtype = desc.objtype;
4557 set->dlen = desc.dlen;
4559 set->size = desc.size;
4560 set->policy = desc.policy;
4563 set->timeout = desc.timeout;
4564 set->gc_int = desc.gc_int;
4566 set->field_count = desc.field_count;
4567 for (i = 0; i < desc.field_count; i++)
4568 set->field_len[i] = desc.field_len[i];
4570 err = ops->init(set, &desc, nla);
4574 err = nft_set_expr_alloc(&ctx, set, nla, set->exprs, &num_exprs, flags);
4576 goto err_set_destroy;
4578 set->num_exprs = num_exprs;
4579 set->handle = nf_tables_alloc_handle(table);
4581 err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
4583 goto err_set_expr_alloc;
4585 list_add_tail_rcu(&set->list, &table->sets);
4590 for (i = 0; i < set->num_exprs; i++)
4591 nft_expr_destroy(&ctx, set->exprs[i]);
4601 struct nft_set_elem_catchall {
4602 struct list_head list;
4603 struct rcu_head rcu;
4607 static void nft_set_catchall_destroy(const struct nft_ctx *ctx,
4608 struct nft_set *set)
4610 struct nft_set_elem_catchall *next, *catchall;
4612 list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
4613 list_del_rcu(&catchall->list);
4614 nft_set_elem_destroy(set, catchall->elem, true);
4615 kfree_rcu(catchall, rcu);
4619 static void nft_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
4623 if (WARN_ON(set->use > 0))
4626 for (i = 0; i < set->num_exprs; i++)
4627 nft_expr_destroy(ctx, set->exprs[i]);
4629 set->ops->destroy(set);
4630 nft_set_catchall_destroy(ctx, set);
4635 static int nf_tables_delset(struct sk_buff *skb, const struct nfnl_info *info,
4636 const struct nlattr * const nla[])
4638 struct netlink_ext_ack *extack = info->extack;
4639 u8 genmask = nft_genmask_next(info->net);
4640 u8 family = info->nfmsg->nfgen_family;
4641 struct net *net = info->net;
4642 const struct nlattr *attr;
4643 struct nft_table *table;
4644 struct nft_set *set;
4647 if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
4648 return -EAFNOSUPPORT;
4650 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
4651 genmask, NETLINK_CB(skb).portid);
4652 if (IS_ERR(table)) {
4653 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4654 return PTR_ERR(table);
4657 if (nla[NFTA_SET_HANDLE]) {
4658 attr = nla[NFTA_SET_HANDLE];
4659 set = nft_set_lookup_byhandle(table, attr, genmask);
4661 attr = nla[NFTA_SET_NAME];
4662 set = nft_set_lookup(table, attr, genmask);
4666 NL_SET_BAD_ATTR(extack, attr);
4667 return PTR_ERR(set);
4670 (info->nlh->nlmsg_flags & NLM_F_NONREC &&
4671 atomic_read(&set->nelems) > 0)) {
4672 NL_SET_BAD_ATTR(extack, attr);
4676 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4678 return nft_delset(&ctx, set);
4681 static int nft_validate_register_store(const struct nft_ctx *ctx,
4682 enum nft_registers reg,
4683 const struct nft_data *data,
4684 enum nft_data_types type,
4687 static int nft_setelem_data_validate(const struct nft_ctx *ctx,
4688 struct nft_set *set,
4689 struct nft_set_elem *elem)
4691 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4692 enum nft_registers dreg;
4694 dreg = nft_type_to_reg(set->dtype);
4695 return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
4696 set->dtype == NFT_DATA_VERDICT ?
4697 NFT_DATA_VERDICT : NFT_DATA_VALUE,
4701 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
4702 struct nft_set *set,
4703 const struct nft_set_iter *iter,
4704 struct nft_set_elem *elem)
4706 return nft_setelem_data_validate(ctx, set, elem);
4709 static int nft_set_catchall_bind_check(const struct nft_ctx *ctx,
4710 struct nft_set *set)
4712 u8 genmask = nft_genmask_next(ctx->net);
4713 struct nft_set_elem_catchall *catchall;
4714 struct nft_set_elem elem;
4715 struct nft_set_ext *ext;
4718 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
4719 ext = nft_set_elem_ext(set, catchall->elem);
4720 if (!nft_set_elem_active(ext, genmask))
4723 elem.priv = catchall->elem;
4724 ret = nft_setelem_data_validate(ctx, set, &elem);
4732 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
4733 struct nft_set_binding *binding)
4735 struct nft_set_binding *i;
4736 struct nft_set_iter iter;
4738 if (set->use == UINT_MAX)
4741 if (!list_empty(&set->bindings) && nft_set_is_anonymous(set))
4744 if (binding->flags & NFT_SET_MAP) {
4745 /* If the set is already bound to the same chain all
4746 * jumps are already validated for that chain.
4748 list_for_each_entry(i, &set->bindings, list) {
4749 if (i->flags & NFT_SET_MAP &&
4750 i->chain == binding->chain)
4754 iter.genmask = nft_genmask_next(ctx->net);
4758 iter.fn = nf_tables_bind_check_setelem;
4760 set->ops->walk(ctx, set, &iter);
4762 iter.err = nft_set_catchall_bind_check(ctx, set);
4768 binding->chain = ctx->chain;
4769 list_add_tail_rcu(&binding->list, &set->bindings);
4770 nft_set_trans_bind(ctx, set);
4775 EXPORT_SYMBOL_GPL(nf_tables_bind_set);
4777 static void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
4778 struct nft_set_binding *binding, bool event)
4780 list_del_rcu(&binding->list);
4782 if (list_empty(&set->bindings) && nft_set_is_anonymous(set)) {
4783 list_del_rcu(&set->list);
4785 nf_tables_set_notify(ctx, set, NFT_MSG_DELSET,
4790 void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set,
4791 struct nft_set_binding *binding,
4792 enum nft_trans_phase phase)
4795 case NFT_TRANS_PREPARE:
4798 case NFT_TRANS_ABORT:
4799 case NFT_TRANS_RELEASE:
4803 nf_tables_unbind_set(ctx, set, binding,
4804 phase == NFT_TRANS_COMMIT);
4807 EXPORT_SYMBOL_GPL(nf_tables_deactivate_set);
4809 void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set)
4811 if (list_empty(&set->bindings) && nft_set_is_anonymous(set))
4812 nft_set_destroy(ctx, set);
4814 EXPORT_SYMBOL_GPL(nf_tables_destroy_set);
4816 const struct nft_set_ext_type nft_set_ext_types[] = {
4817 [NFT_SET_EXT_KEY] = {
4818 .align = __alignof__(u32),
4820 [NFT_SET_EXT_DATA] = {
4821 .align = __alignof__(u32),
4823 [NFT_SET_EXT_EXPRESSIONS] = {
4824 .align = __alignof__(struct nft_set_elem_expr),
4826 [NFT_SET_EXT_OBJREF] = {
4827 .len = sizeof(struct nft_object *),
4828 .align = __alignof__(struct nft_object *),
4830 [NFT_SET_EXT_FLAGS] = {
4832 .align = __alignof__(u8),
4834 [NFT_SET_EXT_TIMEOUT] = {
4836 .align = __alignof__(u64),
4838 [NFT_SET_EXT_EXPIRATION] = {
4840 .align = __alignof__(u64),
4842 [NFT_SET_EXT_USERDATA] = {
4843 .len = sizeof(struct nft_userdata),
4844 .align = __alignof__(struct nft_userdata),
4846 [NFT_SET_EXT_KEY_END] = {
4847 .align = __alignof__(u32),
4855 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
4856 [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED },
4857 [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED },
4858 [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 },
4859 [NFTA_SET_ELEM_TIMEOUT] = { .type = NLA_U64 },
4860 [NFTA_SET_ELEM_EXPIRATION] = { .type = NLA_U64 },
4861 [NFTA_SET_ELEM_USERDATA] = { .type = NLA_BINARY,
4862 .len = NFT_USERDATA_MAXLEN },
4863 [NFTA_SET_ELEM_EXPR] = { .type = NLA_NESTED },
4864 [NFTA_SET_ELEM_OBJREF] = { .type = NLA_STRING,
4865 .len = NFT_OBJ_MAXNAMELEN - 1 },
4866 [NFTA_SET_ELEM_KEY_END] = { .type = NLA_NESTED },
4867 [NFTA_SET_ELEM_EXPRESSIONS] = { .type = NLA_NESTED },
4870 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
4871 [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING,
4872 .len = NFT_TABLE_MAXNAMELEN - 1 },
4873 [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING,
4874 .len = NFT_SET_MAXNAMELEN - 1 },
4875 [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED },
4876 [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 },
4879 static int nft_set_elem_expr_dump(struct sk_buff *skb,
4880 const struct nft_set *set,
4881 const struct nft_set_ext *ext)
4883 struct nft_set_elem_expr *elem_expr;
4884 u32 size, num_exprs = 0;
4885 struct nft_expr *expr;
4886 struct nlattr *nest;
4888 elem_expr = nft_set_ext_expr(ext);
4889 nft_setelem_expr_foreach(expr, elem_expr, size)
4892 if (num_exprs == 1) {
4893 expr = nft_setelem_expr_at(elem_expr, 0);
4894 if (nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, expr) < 0)
4898 } else if (num_exprs > 1) {
4899 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_EXPRESSIONS);
4901 goto nla_put_failure;
4903 nft_setelem_expr_foreach(expr, elem_expr, size) {
4904 expr = nft_setelem_expr_at(elem_expr, size);
4905 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
4906 goto nla_put_failure;
4908 nla_nest_end(skb, nest);
4916 static int nf_tables_fill_setelem(struct sk_buff *skb,
4917 const struct nft_set *set,
4918 const struct nft_set_elem *elem)
4920 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4921 unsigned char *b = skb_tail_pointer(skb);
4922 struct nlattr *nest;
4924 nest = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
4926 goto nla_put_failure;
4928 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) &&
4929 nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
4930 NFT_DATA_VALUE, set->klen) < 0)
4931 goto nla_put_failure;
4933 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
4934 nft_data_dump(skb, NFTA_SET_ELEM_KEY_END, nft_set_ext_key_end(ext),
4935 NFT_DATA_VALUE, set->klen) < 0)
4936 goto nla_put_failure;
4938 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
4939 nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
4940 set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
4942 goto nla_put_failure;
4944 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS) &&
4945 nft_set_elem_expr_dump(skb, set, ext))
4946 goto nla_put_failure;
4948 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
4949 nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
4950 (*nft_set_ext_obj(ext))->key.name) < 0)
4951 goto nla_put_failure;
4953 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
4954 nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
4955 htonl(*nft_set_ext_flags(ext))))
4956 goto nla_put_failure;
4958 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
4959 nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
4960 nf_jiffies64_to_msecs(*nft_set_ext_timeout(ext)),
4962 goto nla_put_failure;
4964 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
4965 u64 expires, now = get_jiffies_64();
4967 expires = *nft_set_ext_expiration(ext);
4968 if (time_before64(now, expires))
4973 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
4974 nf_jiffies64_to_msecs(expires),
4976 goto nla_put_failure;
4979 if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
4980 struct nft_userdata *udata;
4982 udata = nft_set_ext_userdata(ext);
4983 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
4984 udata->len + 1, udata->data))
4985 goto nla_put_failure;
4988 nla_nest_end(skb, nest);
4996 struct nft_set_dump_args {
4997 const struct netlink_callback *cb;
4998 struct nft_set_iter iter;
4999 struct sk_buff *skb;
5002 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
5003 struct nft_set *set,
5004 const struct nft_set_iter *iter,
5005 struct nft_set_elem *elem)
5007 struct nft_set_dump_args *args;
5009 args = container_of(iter, struct nft_set_dump_args, iter);
5010 return nf_tables_fill_setelem(args->skb, set, elem);
5013 struct nft_set_dump_ctx {
5014 const struct nft_set *set;
5018 static int nft_set_catchall_dump(struct net *net, struct sk_buff *skb,
5019 const struct nft_set *set)
5021 struct nft_set_elem_catchall *catchall;
5022 u8 genmask = nft_genmask_cur(net);
5023 struct nft_set_elem elem;
5024 struct nft_set_ext *ext;
5027 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5028 ext = nft_set_elem_ext(set, catchall->elem);
5029 if (!nft_set_elem_active(ext, genmask) ||
5030 nft_set_elem_expired(ext))
5033 elem.priv = catchall->elem;
5034 ret = nf_tables_fill_setelem(skb, set, &elem);
5041 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
5043 struct nft_set_dump_ctx *dump_ctx = cb->data;
5044 struct net *net = sock_net(skb->sk);
5045 struct nftables_pernet *nft_net;
5046 struct nft_table *table;
5047 struct nft_set *set;
5048 struct nft_set_dump_args args;
5049 bool set_found = false;
5050 struct nlmsghdr *nlh;
5051 struct nlattr *nest;
5056 nft_net = nft_pernet(net);
5057 cb->seq = READ_ONCE(nft_net->base_seq);
5059 list_for_each_entry_rcu(table, &nft_net->tables, list) {
5060 if (dump_ctx->ctx.family != NFPROTO_UNSPEC &&
5061 dump_ctx->ctx.family != table->family)
5064 if (table != dump_ctx->ctx.table)
5067 list_for_each_entry_rcu(set, &table->sets, list) {
5068 if (set == dump_ctx->set) {
5081 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM);
5082 portid = NETLINK_CB(cb->skb).portid;
5083 seq = cb->nlh->nlmsg_seq;
5085 nlh = nfnl_msg_put(skb, portid, seq, event, NLM_F_MULTI,
5086 table->family, NFNETLINK_V0, nft_base_seq(net));
5088 goto nla_put_failure;
5090 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name))
5091 goto nla_put_failure;
5092 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
5093 goto nla_put_failure;
5095 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
5097 goto nla_put_failure;
5101 args.iter.genmask = nft_genmask_cur(net);
5102 args.iter.skip = cb->args[0];
5103 args.iter.count = 0;
5105 args.iter.fn = nf_tables_dump_setelem;
5106 set->ops->walk(&dump_ctx->ctx, set, &args.iter);
5108 if (!args.iter.err && args.iter.count == cb->args[0])
5109 args.iter.err = nft_set_catchall_dump(net, skb, set);
5112 nla_nest_end(skb, nest);
5113 nlmsg_end(skb, nlh);
5115 if (args.iter.err && args.iter.err != -EMSGSIZE)
5116 return args.iter.err;
5117 if (args.iter.count == cb->args[0])
5120 cb->args[0] = args.iter.count;
5128 static int nf_tables_dump_set_start(struct netlink_callback *cb)
5130 struct nft_set_dump_ctx *dump_ctx = cb->data;
5132 cb->data = kmemdup(dump_ctx, sizeof(*dump_ctx), GFP_ATOMIC);
5134 return cb->data ? 0 : -ENOMEM;
5137 static int nf_tables_dump_set_done(struct netlink_callback *cb)
5143 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
5144 const struct nft_ctx *ctx, u32 seq,
5145 u32 portid, int event, u16 flags,
5146 const struct nft_set *set,
5147 const struct nft_set_elem *elem)
5149 struct nlmsghdr *nlh;
5150 struct nlattr *nest;
5153 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
5154 nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
5155 NFNETLINK_V0, nft_base_seq(ctx->net));
5157 goto nla_put_failure;
5159 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
5160 goto nla_put_failure;
5161 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
5162 goto nla_put_failure;
5164 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
5166 goto nla_put_failure;
5168 err = nf_tables_fill_setelem(skb, set, elem);
5170 goto nla_put_failure;
5172 nla_nest_end(skb, nest);
5174 nlmsg_end(skb, nlh);
5178 nlmsg_trim(skb, nlh);
5182 static int nft_setelem_parse_flags(const struct nft_set *set,
5183 const struct nlattr *attr, u32 *flags)
5188 *flags = ntohl(nla_get_be32(attr));
5189 if (*flags & ~(NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL))
5191 if (!(set->flags & NFT_SET_INTERVAL) &&
5192 *flags & NFT_SET_ELEM_INTERVAL_END)
5194 if ((*flags & (NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL)) ==
5195 (NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL))
5201 static int nft_setelem_parse_key(struct nft_ctx *ctx, struct nft_set *set,
5202 struct nft_data *key, struct nlattr *attr)
5204 struct nft_data_desc desc = {
5205 .type = NFT_DATA_VALUE,
5206 .size = NFT_DATA_VALUE_MAXLEN,
5210 return nft_data_init(ctx, key, &desc, attr);
5213 static int nft_setelem_parse_data(struct nft_ctx *ctx, struct nft_set *set,
5214 struct nft_data_desc *desc,
5215 struct nft_data *data,
5216 struct nlattr *attr)
5220 if (set->dtype == NFT_DATA_VERDICT)
5221 dtype = NFT_DATA_VERDICT;
5223 dtype = NFT_DATA_VALUE;
5226 desc->size = NFT_DATA_VALUE_MAXLEN;
5227 desc->len = set->dlen;
5228 desc->flags = NFT_DATA_DESC_SETELEM;
5230 return nft_data_init(ctx, data, desc, attr);
5233 static void *nft_setelem_catchall_get(const struct net *net,
5234 const struct nft_set *set)
5236 struct nft_set_elem_catchall *catchall;
5237 u8 genmask = nft_genmask_cur(net);
5238 struct nft_set_ext *ext;
5241 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5242 ext = nft_set_elem_ext(set, catchall->elem);
5243 if (!nft_set_elem_active(ext, genmask) ||
5244 nft_set_elem_expired(ext))
5247 priv = catchall->elem;
5254 static int nft_setelem_get(struct nft_ctx *ctx, struct nft_set *set,
5255 struct nft_set_elem *elem, u32 flags)
5259 if (!(flags & NFT_SET_ELEM_CATCHALL)) {
5260 priv = set->ops->get(ctx->net, set, elem, flags);
5262 return PTR_ERR(priv);
5264 priv = nft_setelem_catchall_get(ctx->net, set);
5273 static int nft_get_set_elem(struct nft_ctx *ctx, struct nft_set *set,
5274 const struct nlattr *attr)
5276 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
5277 struct nft_set_elem elem;
5278 struct sk_buff *skb;
5282 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
5283 nft_set_elem_policy, NULL);
5287 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
5291 if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
5294 if (nla[NFTA_SET_ELEM_KEY]) {
5295 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
5296 nla[NFTA_SET_ELEM_KEY]);
5301 if (nla[NFTA_SET_ELEM_KEY_END]) {
5302 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
5303 nla[NFTA_SET_ELEM_KEY_END]);
5308 err = nft_setelem_get(ctx, set, &elem, flags);
5313 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
5317 err = nf_tables_fill_setelem_info(skb, ctx, ctx->seq, ctx->portid,
5318 NFT_MSG_NEWSETELEM, 0, set, &elem);
5320 goto err_fill_setelem;
5322 return nfnetlink_unicast(skb, ctx->net, ctx->portid);
5329 /* called with rcu_read_lock held */
5330 static int nf_tables_getsetelem(struct sk_buff *skb,
5331 const struct nfnl_info *info,
5332 const struct nlattr * const nla[])
5334 struct netlink_ext_ack *extack = info->extack;
5335 u8 genmask = nft_genmask_cur(info->net);
5336 u8 family = info->nfmsg->nfgen_family;
5337 struct net *net = info->net;
5338 struct nft_table *table;
5339 struct nft_set *set;
5340 struct nlattr *attr;
5344 table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
5345 genmask, NETLINK_CB(skb).portid);
5346 if (IS_ERR(table)) {
5347 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
5348 return PTR_ERR(table);
5351 set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
5353 return PTR_ERR(set);
5355 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
5357 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
5358 struct netlink_dump_control c = {
5359 .start = nf_tables_dump_set_start,
5360 .dump = nf_tables_dump_set,
5361 .done = nf_tables_dump_set_done,
5362 .module = THIS_MODULE,
5364 struct nft_set_dump_ctx dump_ctx = {
5370 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
5373 if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
5376 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
5377 err = nft_get_set_elem(&ctx, set, attr);
5385 static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
5386 const struct nft_set *set,
5387 const struct nft_set_elem *elem,
5390 struct nftables_pernet *nft_net;
5391 struct net *net = ctx->net;
5392 u32 portid = ctx->portid;
5393 struct sk_buff *skb;
5397 if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
5400 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
5404 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
5405 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
5407 err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
5414 nft_net = nft_pernet(net);
5415 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
5418 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
5421 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
5423 struct nft_set *set)
5425 struct nft_trans *trans;
5427 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
5431 nft_trans_elem_set(trans) = set;
5435 struct nft_expr *nft_set_elem_expr_alloc(const struct nft_ctx *ctx,
5436 const struct nft_set *set,
5437 const struct nlattr *attr)
5439 struct nft_expr *expr;
5442 expr = nft_expr_init(ctx, attr);
5447 if (expr->ops->type->flags & NFT_EXPR_GC) {
5448 if (set->flags & NFT_SET_TIMEOUT)
5449 goto err_set_elem_expr;
5450 if (!set->ops->gc_init)
5451 goto err_set_elem_expr;
5452 set->ops->gc_init(set);
5458 nft_expr_destroy(ctx, expr);
5459 return ERR_PTR(err);
5462 void *nft_set_elem_init(const struct nft_set *set,
5463 const struct nft_set_ext_tmpl *tmpl,
5464 const u32 *key, const u32 *key_end,
5465 const u32 *data, u64 timeout, u64 expiration, gfp_t gfp)
5467 struct nft_set_ext *ext;
5470 elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
5474 ext = nft_set_elem_ext(set, elem);
5475 nft_set_ext_init(ext, tmpl);
5477 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY))
5478 memcpy(nft_set_ext_key(ext), key, set->klen);
5479 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END))
5480 memcpy(nft_set_ext_key_end(ext), key_end, set->klen);
5481 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
5482 memcpy(nft_set_ext_data(ext), data, set->dlen);
5483 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
5484 *nft_set_ext_expiration(ext) = get_jiffies_64() + expiration;
5485 if (expiration == 0)
5486 *nft_set_ext_expiration(ext) += timeout;
5488 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
5489 *nft_set_ext_timeout(ext) = timeout;
5494 static void __nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
5495 struct nft_expr *expr)
5497 if (expr->ops->destroy_clone) {
5498 expr->ops->destroy_clone(ctx, expr);
5499 module_put(expr->ops->type->owner);
5501 nf_tables_expr_destroy(ctx, expr);
5505 static void nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
5506 struct nft_set_elem_expr *elem_expr)
5508 struct nft_expr *expr;
5511 nft_setelem_expr_foreach(expr, elem_expr, size)
5512 __nft_set_elem_expr_destroy(ctx, expr);
5515 void nft_set_elem_destroy(const struct nft_set *set, void *elem,
5518 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
5519 struct nft_ctx ctx = {
5520 .net = read_pnet(&set->net),
5521 .family = set->table->family,
5524 nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE);
5525 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
5526 nft_data_release(nft_set_ext_data(ext), set->dtype);
5527 if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
5528 nft_set_elem_expr_destroy(&ctx, nft_set_ext_expr(ext));
5530 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
5531 (*nft_set_ext_obj(ext))->use--;
5534 EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
5536 /* Only called from commit path, nft_setelem_data_deactivate() already deals
5537 * with the refcounting from the preparation phase.
5539 static void nf_tables_set_elem_destroy(const struct nft_ctx *ctx,
5540 const struct nft_set *set, void *elem)
5542 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
5544 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
5545 nft_set_elem_expr_destroy(ctx, nft_set_ext_expr(ext));
5550 int nft_set_elem_expr_clone(const struct nft_ctx *ctx, struct nft_set *set,
5551 struct nft_expr *expr_array[])
5553 struct nft_expr *expr;
5556 for (i = 0; i < set->num_exprs; i++) {
5557 expr = kzalloc(set->exprs[i]->ops->size, GFP_KERNEL);
5561 err = nft_expr_clone(expr, set->exprs[i]);
5566 expr_array[i] = expr;
5572 for (k = i - 1; k >= 0; k--)
5573 nft_expr_destroy(ctx, expr_array[k]);
5578 static int nft_set_elem_expr_setup(struct nft_ctx *ctx,
5579 const struct nft_set_ext *ext,
5580 struct nft_expr *expr_array[],
5583 struct nft_set_elem_expr *elem_expr = nft_set_ext_expr(ext);
5584 struct nft_expr *expr;
5587 for (i = 0; i < num_exprs; i++) {
5588 expr = nft_setelem_expr_at(elem_expr, elem_expr->size);
5589 err = nft_expr_clone(expr, expr_array[i]);
5591 goto err_elem_expr_setup;
5593 elem_expr->size += expr_array[i]->ops->size;
5594 nft_expr_destroy(ctx, expr_array[i]);
5595 expr_array[i] = NULL;
5600 err_elem_expr_setup:
5601 for (; i < num_exprs; i++) {
5602 nft_expr_destroy(ctx, expr_array[i]);
5603 expr_array[i] = NULL;
5609 struct nft_set_ext *nft_set_catchall_lookup(const struct net *net,
5610 const struct nft_set *set)
5612 struct nft_set_elem_catchall *catchall;
5613 u8 genmask = nft_genmask_cur(net);
5614 struct nft_set_ext *ext;
5616 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5617 ext = nft_set_elem_ext(set, catchall->elem);
5618 if (nft_set_elem_active(ext, genmask) &&
5619 !nft_set_elem_expired(ext))
5625 EXPORT_SYMBOL_GPL(nft_set_catchall_lookup);
5627 void *nft_set_catchall_gc(const struct nft_set *set)
5629 struct nft_set_elem_catchall *catchall, *next;
5630 struct nft_set_ext *ext;
5633 list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
5634 ext = nft_set_elem_ext(set, catchall->elem);
5636 if (!nft_set_elem_expired(ext) ||
5637 nft_set_elem_mark_busy(ext))
5640 elem = catchall->elem;
5641 list_del_rcu(&catchall->list);
5642 kfree_rcu(catchall, rcu);
5648 EXPORT_SYMBOL_GPL(nft_set_catchall_gc);
5650 static int nft_setelem_catchall_insert(const struct net *net,
5651 struct nft_set *set,
5652 const struct nft_set_elem *elem,
5653 struct nft_set_ext **pext)
5655 struct nft_set_elem_catchall *catchall;
5656 u8 genmask = nft_genmask_next(net);
5657 struct nft_set_ext *ext;
5659 list_for_each_entry(catchall, &set->catchall_list, list) {
5660 ext = nft_set_elem_ext(set, catchall->elem);
5661 if (nft_set_elem_active(ext, genmask)) {
5667 catchall = kmalloc(sizeof(*catchall), GFP_KERNEL);
5671 catchall->elem = elem->priv;
5672 list_add_tail_rcu(&catchall->list, &set->catchall_list);
5677 static int nft_setelem_insert(const struct net *net,
5678 struct nft_set *set,
5679 const struct nft_set_elem *elem,
5680 struct nft_set_ext **ext, unsigned int flags)
5684 if (flags & NFT_SET_ELEM_CATCHALL)
5685 ret = nft_setelem_catchall_insert(net, set, elem, ext);
5687 ret = set->ops->insert(net, set, elem, ext);
5692 static bool nft_setelem_is_catchall(const struct nft_set *set,
5693 const struct nft_set_elem *elem)
5695 struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5697 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
5698 *nft_set_ext_flags(ext) & NFT_SET_ELEM_CATCHALL)
5704 static void nft_setelem_activate(struct net *net, struct nft_set *set,
5705 struct nft_set_elem *elem)
5707 struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5709 if (nft_setelem_is_catchall(set, elem)) {
5710 nft_set_elem_change_active(net, set, ext);
5711 nft_set_elem_clear_busy(ext);
5713 set->ops->activate(net, set, elem);
5717 static int nft_setelem_catchall_deactivate(const struct net *net,
5718 struct nft_set *set,
5719 struct nft_set_elem *elem)
5721 struct nft_set_elem_catchall *catchall;
5722 struct nft_set_ext *ext;
5724 list_for_each_entry(catchall, &set->catchall_list, list) {
5725 ext = nft_set_elem_ext(set, catchall->elem);
5726 if (!nft_is_active(net, ext) ||
5727 nft_set_elem_mark_busy(ext))
5731 elem->priv = catchall->elem;
5732 nft_set_elem_change_active(net, set, ext);
5739 static int __nft_setelem_deactivate(const struct net *net,
5740 struct nft_set *set,
5741 struct nft_set_elem *elem)
5745 priv = set->ops->deactivate(net, set, elem);
5756 static int nft_setelem_deactivate(const struct net *net,
5757 struct nft_set *set,
5758 struct nft_set_elem *elem, u32 flags)
5762 if (flags & NFT_SET_ELEM_CATCHALL)
5763 ret = nft_setelem_catchall_deactivate(net, set, elem);
5765 ret = __nft_setelem_deactivate(net, set, elem);
5770 static void nft_setelem_catchall_remove(const struct net *net,
5771 const struct nft_set *set,
5772 const struct nft_set_elem *elem)
5774 struct nft_set_elem_catchall *catchall, *next;
5776 list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
5777 if (catchall->elem == elem->priv) {
5778 list_del_rcu(&catchall->list);
5779 kfree_rcu(catchall, rcu);
5785 static void nft_setelem_remove(const struct net *net,
5786 const struct nft_set *set,
5787 const struct nft_set_elem *elem)
5789 if (nft_setelem_is_catchall(set, elem))
5790 nft_setelem_catchall_remove(net, set, elem);
5792 set->ops->remove(net, set, elem);
5795 static bool nft_setelem_valid_key_end(const struct nft_set *set,
5796 struct nlattr **nla, u32 flags)
5798 if ((set->flags & (NFT_SET_CONCAT | NFT_SET_INTERVAL)) ==
5799 (NFT_SET_CONCAT | NFT_SET_INTERVAL)) {
5800 if (flags & NFT_SET_ELEM_INTERVAL_END)
5803 if (nla[NFTA_SET_ELEM_KEY_END] &&
5804 flags & NFT_SET_ELEM_CATCHALL)
5807 if (nla[NFTA_SET_ELEM_KEY_END])
5814 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
5815 const struct nlattr *attr, u32 nlmsg_flags)
5817 struct nft_expr *expr_array[NFT_SET_EXPR_MAX] = {};
5818 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
5819 u8 genmask = nft_genmask_next(ctx->net);
5820 u32 flags = 0, size = 0, num_exprs = 0;
5821 struct nft_set_ext_tmpl tmpl;
5822 struct nft_set_ext *ext, *ext2;
5823 struct nft_set_elem elem;
5824 struct nft_set_binding *binding;
5825 struct nft_object *obj = NULL;
5826 struct nft_userdata *udata;
5827 struct nft_data_desc desc;
5828 enum nft_registers dreg;
5829 struct nft_trans *trans;
5835 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
5836 nft_set_elem_policy, NULL);
5840 nft_set_ext_prepare(&tmpl);
5842 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
5846 if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
5850 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
5855 if (set->flags & NFT_SET_MAP) {
5856 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
5857 !(flags & NFT_SET_ELEM_INTERVAL_END))
5860 if (nla[NFTA_SET_ELEM_DATA] != NULL)
5864 if (set->flags & NFT_SET_OBJECT) {
5865 if (!nla[NFTA_SET_ELEM_OBJREF] &&
5866 !(flags & NFT_SET_ELEM_INTERVAL_END))
5869 if (nla[NFTA_SET_ELEM_OBJREF])
5873 if (!nft_setelem_valid_key_end(set, nla, flags))
5876 if ((flags & NFT_SET_ELEM_INTERVAL_END) &&
5877 (nla[NFTA_SET_ELEM_DATA] ||
5878 nla[NFTA_SET_ELEM_OBJREF] ||
5879 nla[NFTA_SET_ELEM_TIMEOUT] ||
5880 nla[NFTA_SET_ELEM_EXPIRATION] ||
5881 nla[NFTA_SET_ELEM_USERDATA] ||
5882 nla[NFTA_SET_ELEM_EXPR] ||
5883 nla[NFTA_SET_ELEM_KEY_END] ||
5884 nla[NFTA_SET_ELEM_EXPRESSIONS]))
5888 if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
5889 if (!(set->flags & NFT_SET_TIMEOUT))
5891 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_TIMEOUT],
5895 } else if (set->flags & NFT_SET_TIMEOUT &&
5896 !(flags & NFT_SET_ELEM_INTERVAL_END)) {
5897 timeout = READ_ONCE(set->timeout);
5901 if (nla[NFTA_SET_ELEM_EXPIRATION] != NULL) {
5902 if (!(set->flags & NFT_SET_TIMEOUT))
5904 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_EXPIRATION],
5910 if (nla[NFTA_SET_ELEM_EXPR]) {
5911 struct nft_expr *expr;
5913 if (set->num_exprs && set->num_exprs != 1)
5916 expr = nft_set_elem_expr_alloc(ctx, set,
5917 nla[NFTA_SET_ELEM_EXPR]);
5919 return PTR_ERR(expr);
5921 expr_array[0] = expr;
5924 if (set->num_exprs && set->exprs[0]->ops != expr->ops) {
5926 goto err_set_elem_expr;
5928 } else if (nla[NFTA_SET_ELEM_EXPRESSIONS]) {
5929 struct nft_expr *expr;
5934 nla_for_each_nested(tmp, nla[NFTA_SET_ELEM_EXPRESSIONS], left) {
5935 if (i == NFT_SET_EXPR_MAX ||
5936 (set->num_exprs && set->num_exprs == i)) {
5938 goto err_set_elem_expr;
5940 if (nla_type(tmp) != NFTA_LIST_ELEM) {
5942 goto err_set_elem_expr;
5944 expr = nft_set_elem_expr_alloc(ctx, set, tmp);
5946 err = PTR_ERR(expr);
5947 goto err_set_elem_expr;
5949 expr_array[i] = expr;
5952 if (set->num_exprs && expr->ops != set->exprs[i]->ops) {
5954 goto err_set_elem_expr;
5958 if (set->num_exprs && set->num_exprs != i) {
5960 goto err_set_elem_expr;
5962 } else if (set->num_exprs > 0 &&
5963 !(flags & NFT_SET_ELEM_INTERVAL_END)) {
5964 err = nft_set_elem_expr_clone(ctx, set, expr_array);
5966 goto err_set_elem_expr_clone;
5968 num_exprs = set->num_exprs;
5971 if (nla[NFTA_SET_ELEM_KEY]) {
5972 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
5973 nla[NFTA_SET_ELEM_KEY]);
5975 goto err_set_elem_expr;
5977 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
5982 if (nla[NFTA_SET_ELEM_KEY_END]) {
5983 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
5984 nla[NFTA_SET_ELEM_KEY_END]);
5988 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
5990 goto err_parse_key_end;
5994 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
5996 goto err_parse_key_end;
5998 if (timeout != READ_ONCE(set->timeout)) {
5999 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
6001 goto err_parse_key_end;
6006 for (i = 0; i < num_exprs; i++)
6007 size += expr_array[i]->ops->size;
6009 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_EXPRESSIONS,
6010 sizeof(struct nft_set_elem_expr) + size);
6012 goto err_parse_key_end;
6015 if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
6016 obj = nft_obj_lookup(ctx->net, ctx->table,
6017 nla[NFTA_SET_ELEM_OBJREF],
6018 set->objtype, genmask);
6021 goto err_parse_key_end;
6023 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
6025 goto err_parse_key_end;
6028 if (nla[NFTA_SET_ELEM_DATA] != NULL) {
6029 err = nft_setelem_parse_data(ctx, set, &desc, &elem.data.val,
6030 nla[NFTA_SET_ELEM_DATA]);
6032 goto err_parse_key_end;
6034 dreg = nft_type_to_reg(set->dtype);
6035 list_for_each_entry(binding, &set->bindings, list) {
6036 struct nft_ctx bind_ctx = {
6038 .family = ctx->family,
6039 .table = ctx->table,
6040 .chain = (struct nft_chain *)binding->chain,
6043 if (!(binding->flags & NFT_SET_MAP))
6046 err = nft_validate_register_store(&bind_ctx, dreg,
6048 desc.type, desc.len);
6050 goto err_parse_data;
6052 if (desc.type == NFT_DATA_VERDICT &&
6053 (elem.data.val.verdict.code == NFT_GOTO ||
6054 elem.data.val.verdict.code == NFT_JUMP))
6055 nft_validate_state_update(ctx->net,
6059 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, desc.len);
6061 goto err_parse_data;
6064 /* The full maximum length of userdata can exceed the maximum
6065 * offset value (U8_MAX) for following extensions, therefor it
6066 * must be the last extension added.
6069 if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
6070 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
6072 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
6075 goto err_parse_data;
6080 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
6081 elem.key_end.val.data, elem.data.val.data,
6082 timeout, expiration, GFP_KERNEL);
6083 if (elem.priv == NULL)
6084 goto err_parse_data;
6086 ext = nft_set_elem_ext(set, elem.priv);
6088 *nft_set_ext_flags(ext) = flags;
6090 udata = nft_set_ext_userdata(ext);
6091 udata->len = ulen - 1;
6092 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
6095 *nft_set_ext_obj(ext) = obj;
6098 err = nft_set_elem_expr_setup(ctx, ext, expr_array, num_exprs);
6102 trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
6103 if (trans == NULL) {
6108 ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK;
6110 err = nft_setelem_insert(ctx->net, set, &elem, &ext2, flags);
6112 if (err == -EEXIST) {
6113 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^
6114 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) ||
6115 nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^
6116 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF))
6117 goto err_element_clash;
6118 if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
6119 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
6120 memcmp(nft_set_ext_data(ext),
6121 nft_set_ext_data(ext2), set->dlen) != 0) ||
6122 (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
6123 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
6124 *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
6125 goto err_element_clash;
6126 else if (!(nlmsg_flags & NLM_F_EXCL))
6128 } else if (err == -ENOTEMPTY) {
6129 /* ENOTEMPTY reports overlapping between this element
6130 * and an existing one.
6134 goto err_element_clash;
6137 if (!(flags & NFT_SET_ELEM_CATCHALL) && set->size &&
6138 !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact)) {
6143 nft_trans_elem(trans) = elem;
6144 nft_trans_commit_list_add_tail(ctx->net, trans);
6148 nft_setelem_remove(ctx->net, set, &elem);
6155 nf_tables_set_elem_destroy(ctx, set, elem.priv);
6157 if (nla[NFTA_SET_ELEM_DATA] != NULL)
6158 nft_data_release(&elem.data.val, desc.type);
6160 nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
6162 nft_data_release(&elem.key.val, NFT_DATA_VALUE);
6164 for (i = 0; i < num_exprs && expr_array[i]; i++)
6165 nft_expr_destroy(ctx, expr_array[i]);
6166 err_set_elem_expr_clone:
6170 static int nf_tables_newsetelem(struct sk_buff *skb,
6171 const struct nfnl_info *info,
6172 const struct nlattr * const nla[])
6174 struct nftables_pernet *nft_net = nft_pernet(info->net);
6175 struct netlink_ext_ack *extack = info->extack;
6176 u8 genmask = nft_genmask_next(info->net);
6177 u8 family = info->nfmsg->nfgen_family;
6178 struct net *net = info->net;
6179 const struct nlattr *attr;
6180 struct nft_table *table;
6181 struct nft_set *set;
6185 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
6188 table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
6189 genmask, NETLINK_CB(skb).portid);
6190 if (IS_ERR(table)) {
6191 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
6192 return PTR_ERR(table);
6195 set = nft_set_lookup_global(net, table, nla[NFTA_SET_ELEM_LIST_SET],
6196 nla[NFTA_SET_ELEM_LIST_SET_ID], genmask);
6198 return PTR_ERR(set);
6200 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
6203 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6205 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
6206 err = nft_add_set_elem(&ctx, set, attr, info->nlh->nlmsg_flags);
6211 if (nft_net->validate_state == NFT_VALIDATE_DO)
6212 return nft_table_validate(net, table);
6218 * nft_data_hold - hold a nft_data item
6220 * @data: struct nft_data to release
6221 * @type: type of data
6223 * Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded,
6224 * NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and
6225 * NFT_GOTO verdicts. This function must be called on active data objects
6226 * from the second phase of the commit protocol.
6228 void nft_data_hold(const struct nft_data *data, enum nft_data_types type)
6230 struct nft_chain *chain;
6231 struct nft_rule *rule;
6233 if (type == NFT_DATA_VERDICT) {
6234 switch (data->verdict.code) {
6237 chain = data->verdict.chain;
6240 if (!nft_chain_is_bound(chain))
6243 chain->table->use++;
6244 list_for_each_entry(rule, &chain->rules, list)
6247 nft_chain_add(chain->table, chain);
6253 static void nft_setelem_data_activate(const struct net *net,
6254 const struct nft_set *set,
6255 struct nft_set_elem *elem)
6257 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6259 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6260 nft_data_hold(nft_set_ext_data(ext), set->dtype);
6261 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6262 (*nft_set_ext_obj(ext))->use++;
6265 static void nft_setelem_data_deactivate(const struct net *net,
6266 const struct nft_set *set,
6267 struct nft_set_elem *elem)
6269 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6271 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6272 nft_data_release(nft_set_ext_data(ext), set->dtype);
6273 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6274 (*nft_set_ext_obj(ext))->use--;
6277 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
6278 const struct nlattr *attr)
6280 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
6281 struct nft_set_ext_tmpl tmpl;
6282 struct nft_set_elem elem;
6283 struct nft_set_ext *ext;
6284 struct nft_trans *trans;
6288 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
6289 nft_set_elem_policy, NULL);
6293 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
6297 if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
6300 if (!nft_setelem_valid_key_end(set, nla, flags))
6303 nft_set_ext_prepare(&tmpl);
6306 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
6311 if (nla[NFTA_SET_ELEM_KEY]) {
6312 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
6313 nla[NFTA_SET_ELEM_KEY]);
6317 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
6322 if (nla[NFTA_SET_ELEM_KEY_END]) {
6323 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
6324 nla[NFTA_SET_ELEM_KEY_END]);
6328 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
6330 goto fail_elem_key_end;
6334 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
6335 elem.key_end.val.data, NULL, 0, 0,
6337 if (elem.priv == NULL)
6338 goto fail_elem_key_end;
6340 ext = nft_set_elem_ext(set, elem.priv);
6342 *nft_set_ext_flags(ext) = flags;
6344 trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
6348 err = nft_setelem_deactivate(ctx->net, set, &elem, flags);
6352 nft_setelem_data_deactivate(ctx->net, set, &elem);
6354 nft_trans_elem(trans) = elem;
6355 nft_trans_commit_list_add_tail(ctx->net, trans);
6363 nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
6365 nft_data_release(&elem.key.val, NFT_DATA_VALUE);
6369 static int nft_setelem_flush(const struct nft_ctx *ctx,
6370 struct nft_set *set,
6371 const struct nft_set_iter *iter,
6372 struct nft_set_elem *elem)
6374 struct nft_trans *trans;
6377 trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
6378 sizeof(struct nft_trans_elem), GFP_ATOMIC);
6382 if (!set->ops->flush(ctx->net, set, elem->priv)) {
6388 nft_setelem_data_deactivate(ctx->net, set, elem);
6389 nft_trans_elem_set(trans) = set;
6390 nft_trans_elem(trans) = *elem;
6391 nft_trans_commit_list_add_tail(ctx->net, trans);
6399 static int __nft_set_catchall_flush(const struct nft_ctx *ctx,
6400 struct nft_set *set,
6401 struct nft_set_elem *elem)
6403 struct nft_trans *trans;
6405 trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
6406 sizeof(struct nft_trans_elem), GFP_KERNEL);
6410 nft_setelem_data_deactivate(ctx->net, set, elem);
6411 nft_trans_elem_set(trans) = set;
6412 nft_trans_elem(trans) = *elem;
6413 nft_trans_commit_list_add_tail(ctx->net, trans);
6418 static int nft_set_catchall_flush(const struct nft_ctx *ctx,
6419 struct nft_set *set)
6421 u8 genmask = nft_genmask_next(ctx->net);
6422 struct nft_set_elem_catchall *catchall;
6423 struct nft_set_elem elem;
6424 struct nft_set_ext *ext;
6427 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
6428 ext = nft_set_elem_ext(set, catchall->elem);
6429 if (!nft_set_elem_active(ext, genmask) ||
6430 nft_set_elem_mark_busy(ext))
6433 elem.priv = catchall->elem;
6434 ret = __nft_set_catchall_flush(ctx, set, &elem);
6442 static int nft_set_flush(struct nft_ctx *ctx, struct nft_set *set, u8 genmask)
6444 struct nft_set_iter iter = {
6446 .fn = nft_setelem_flush,
6449 set->ops->walk(ctx, set, &iter);
6451 iter.err = nft_set_catchall_flush(ctx, set);
6456 static int nf_tables_delsetelem(struct sk_buff *skb,
6457 const struct nfnl_info *info,
6458 const struct nlattr * const nla[])
6460 struct netlink_ext_ack *extack = info->extack;
6461 u8 genmask = nft_genmask_next(info->net);
6462 u8 family = info->nfmsg->nfgen_family;
6463 struct net *net = info->net;
6464 const struct nlattr *attr;
6465 struct nft_table *table;
6466 struct nft_set *set;
6470 table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
6471 genmask, NETLINK_CB(skb).portid);
6472 if (IS_ERR(table)) {
6473 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
6474 return PTR_ERR(table);
6477 set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
6479 return PTR_ERR(set);
6480 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
6483 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6485 if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
6486 return nft_set_flush(&ctx, set, genmask);
6488 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
6489 err = nft_del_setelem(&ctx, set, attr);
6496 void nft_set_gc_batch_release(struct rcu_head *rcu)
6498 struct nft_set_gc_batch *gcb;
6501 gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu);
6502 for (i = 0; i < gcb->head.cnt; i++)
6503 nft_set_elem_destroy(gcb->head.set, gcb->elems[i], true);
6507 struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
6510 struct nft_set_gc_batch *gcb;
6512 gcb = kzalloc(sizeof(*gcb), gfp);
6515 gcb->head.set = set;
6524 * nft_register_obj- register nf_tables stateful object type
6525 * @obj_type: object type
6527 * Registers the object type for use with nf_tables. Returns zero on
6528 * success or a negative errno code otherwise.
6530 int nft_register_obj(struct nft_object_type *obj_type)
6532 if (obj_type->type == NFT_OBJECT_UNSPEC)
6535 nfnl_lock(NFNL_SUBSYS_NFTABLES);
6536 list_add_rcu(&obj_type->list, &nf_tables_objects);
6537 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
6540 EXPORT_SYMBOL_GPL(nft_register_obj);
6543 * nft_unregister_obj - unregister nf_tables object type
6544 * @obj_type: object type
6546 * Unregisters the object type for use with nf_tables.
6548 void nft_unregister_obj(struct nft_object_type *obj_type)
6550 nfnl_lock(NFNL_SUBSYS_NFTABLES);
6551 list_del_rcu(&obj_type->list);
6552 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
6554 EXPORT_SYMBOL_GPL(nft_unregister_obj);
6556 struct nft_object *nft_obj_lookup(const struct net *net,
6557 const struct nft_table *table,
6558 const struct nlattr *nla, u32 objtype,
6561 struct nft_object_hash_key k = { .table = table };
6562 char search[NFT_OBJ_MAXNAMELEN];
6563 struct rhlist_head *tmp, *list;
6564 struct nft_object *obj;
6566 nla_strscpy(search, nla, sizeof(search));
6569 WARN_ON_ONCE(!rcu_read_lock_held() &&
6570 !lockdep_commit_lock_is_held(net));
6573 list = rhltable_lookup(&nft_objname_ht, &k, nft_objname_ht_params);
6577 rhl_for_each_entry_rcu(obj, tmp, list, rhlhead) {
6578 if (objtype == obj->ops->type->type &&
6579 nft_active_genmask(obj, genmask)) {
6586 return ERR_PTR(-ENOENT);
6588 EXPORT_SYMBOL_GPL(nft_obj_lookup);
6590 static struct nft_object *nft_obj_lookup_byhandle(const struct nft_table *table,
6591 const struct nlattr *nla,
6592 u32 objtype, u8 genmask)
6594 struct nft_object *obj;
6596 list_for_each_entry(obj, &table->objects, list) {
6597 if (be64_to_cpu(nla_get_be64(nla)) == obj->handle &&
6598 objtype == obj->ops->type->type &&
6599 nft_active_genmask(obj, genmask))
6602 return ERR_PTR(-ENOENT);
6605 static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
6606 [NFTA_OBJ_TABLE] = { .type = NLA_STRING,
6607 .len = NFT_TABLE_MAXNAMELEN - 1 },
6608 [NFTA_OBJ_NAME] = { .type = NLA_STRING,
6609 .len = NFT_OBJ_MAXNAMELEN - 1 },
6610 [NFTA_OBJ_TYPE] = { .type = NLA_U32 },
6611 [NFTA_OBJ_DATA] = { .type = NLA_NESTED },
6612 [NFTA_OBJ_HANDLE] = { .type = NLA_U64},
6613 [NFTA_OBJ_USERDATA] = { .type = NLA_BINARY,
6614 .len = NFT_USERDATA_MAXLEN },
6617 static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,
6618 const struct nft_object_type *type,
6619 const struct nlattr *attr)
6622 const struct nft_object_ops *ops;
6623 struct nft_object *obj;
6626 tb = kmalloc_array(type->maxattr + 1, sizeof(*tb), GFP_KERNEL);
6631 err = nla_parse_nested_deprecated(tb, type->maxattr, attr,
6632 type->policy, NULL);
6636 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
6639 if (type->select_ops) {
6640 ops = type->select_ops(ctx, (const struct nlattr * const *)tb);
6650 obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL);
6654 err = ops->init(ctx, (const struct nlattr * const *)tb, obj);
6667 return ERR_PTR(err);
6670 static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
6671 struct nft_object *obj, bool reset)
6673 struct nlattr *nest;
6675 nest = nla_nest_start_noflag(skb, attr);
6677 goto nla_put_failure;
6678 if (obj->ops->dump(skb, obj, reset) < 0)
6679 goto nla_put_failure;
6680 nla_nest_end(skb, nest);
6687 static const struct nft_object_type *__nft_obj_type_get(u32 objtype)
6689 const struct nft_object_type *type;
6691 list_for_each_entry(type, &nf_tables_objects, list) {
6692 if (objtype == type->type)
6698 static const struct nft_object_type *
6699 nft_obj_type_get(struct net *net, u32 objtype)
6701 const struct nft_object_type *type;
6703 type = __nft_obj_type_get(objtype);
6704 if (type != NULL && try_module_get(type->owner))
6707 lockdep_nfnl_nft_mutex_not_held();
6708 #ifdef CONFIG_MODULES
6710 if (nft_request_module(net, "nft-obj-%u", objtype) == -EAGAIN)
6711 return ERR_PTR(-EAGAIN);
6714 return ERR_PTR(-ENOENT);
6717 static int nf_tables_updobj(const struct nft_ctx *ctx,
6718 const struct nft_object_type *type,
6719 const struct nlattr *attr,
6720 struct nft_object *obj)
6722 struct nft_object *newobj;
6723 struct nft_trans *trans;
6726 if (!try_module_get(type->owner))
6729 trans = nft_trans_alloc(ctx, NFT_MSG_NEWOBJ,
6730 sizeof(struct nft_trans_obj));
6734 newobj = nft_obj_init(ctx, type, attr);
6735 if (IS_ERR(newobj)) {
6736 err = PTR_ERR(newobj);
6737 goto err_free_trans;
6740 nft_trans_obj(trans) = obj;
6741 nft_trans_obj_update(trans) = true;
6742 nft_trans_obj_newobj(trans) = newobj;
6743 nft_trans_commit_list_add_tail(ctx->net, trans);
6750 module_put(type->owner);
6754 static int nf_tables_newobj(struct sk_buff *skb, const struct nfnl_info *info,
6755 const struct nlattr * const nla[])
6757 struct netlink_ext_ack *extack = info->extack;
6758 u8 genmask = nft_genmask_next(info->net);
6759 u8 family = info->nfmsg->nfgen_family;
6760 const struct nft_object_type *type;
6761 struct net *net = info->net;
6762 struct nft_table *table;
6763 struct nft_object *obj;
6768 if (!nla[NFTA_OBJ_TYPE] ||
6769 !nla[NFTA_OBJ_NAME] ||
6770 !nla[NFTA_OBJ_DATA])
6773 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
6774 NETLINK_CB(skb).portid);
6775 if (IS_ERR(table)) {
6776 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
6777 return PTR_ERR(table);
6780 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
6781 obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
6784 if (err != -ENOENT) {
6785 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
6789 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
6790 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
6793 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
6796 type = __nft_obj_type_get(objtype);
6797 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6799 return nf_tables_updobj(&ctx, type, nla[NFTA_OBJ_DATA], obj);
6802 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6804 type = nft_obj_type_get(net, objtype);
6806 return PTR_ERR(type);
6808 obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]);
6813 obj->key.table = table;
6814 obj->handle = nf_tables_alloc_handle(table);
6816 obj->key.name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL);
6817 if (!obj->key.name) {
6822 if (nla[NFTA_OBJ_USERDATA]) {
6823 obj->udata = nla_memdup(nla[NFTA_OBJ_USERDATA], GFP_KERNEL);
6824 if (obj->udata == NULL)
6827 obj->udlen = nla_len(nla[NFTA_OBJ_USERDATA]);
6830 err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
6834 err = rhltable_insert(&nft_objname_ht, &obj->rhlhead,
6835 nft_objname_ht_params);
6839 list_add_tail_rcu(&obj->list, &table->objects);
6843 /* queued in transaction log */
6844 INIT_LIST_HEAD(&obj->list);
6849 kfree(obj->key.name);
6851 if (obj->ops->destroy)
6852 obj->ops->destroy(&ctx, obj);
6855 module_put(type->owner);
6859 static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
6860 u32 portid, u32 seq, int event, u32 flags,
6861 int family, const struct nft_table *table,
6862 struct nft_object *obj, bool reset)
6864 struct nlmsghdr *nlh;
6866 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
6867 nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
6868 NFNETLINK_V0, nft_base_seq(net));
6870 goto nla_put_failure;
6872 if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
6873 nla_put_string(skb, NFTA_OBJ_NAME, obj->key.name) ||
6874 nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) ||
6875 nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
6876 nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset) ||
6877 nla_put_be64(skb, NFTA_OBJ_HANDLE, cpu_to_be64(obj->handle),
6879 goto nla_put_failure;
6882 nla_put(skb, NFTA_OBJ_USERDATA, obj->udlen, obj->udata))
6883 goto nla_put_failure;
6885 nlmsg_end(skb, nlh);
6889 nlmsg_trim(skb, nlh);
6893 struct nft_obj_filter {
6898 static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
6900 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
6901 const struct nft_table *table;
6902 unsigned int idx = 0, s_idx = cb->args[0];
6903 struct nft_obj_filter *filter = cb->data;
6904 struct net *net = sock_net(skb->sk);
6905 int family = nfmsg->nfgen_family;
6906 struct nftables_pernet *nft_net;
6907 struct nft_object *obj;
6910 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
6914 nft_net = nft_pernet(net);
6915 cb->seq = READ_ONCE(nft_net->base_seq);
6917 list_for_each_entry_rcu(table, &nft_net->tables, list) {
6918 if (family != NFPROTO_UNSPEC && family != table->family)
6921 list_for_each_entry_rcu(obj, &table->objects, list) {
6922 if (!nft_is_active(net, obj))
6927 memset(&cb->args[1], 0,
6928 sizeof(cb->args) - sizeof(cb->args[0]));
6929 if (filter && filter->table &&
6930 strcmp(filter->table, table->name))
6933 filter->type != NFT_OBJECT_UNSPEC &&
6934 obj->ops->type->type != filter->type)
6937 char *buf = kasprintf(GFP_ATOMIC,
6942 audit_log_nfcfg(buf,
6945 AUDIT_NFT_OP_OBJ_RESET,
6950 if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid,
6953 NLM_F_MULTI | NLM_F_APPEND,
6954 table->family, table,
6958 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
6970 static int nf_tables_dump_obj_start(struct netlink_callback *cb)
6972 const struct nlattr * const *nla = cb->data;
6973 struct nft_obj_filter *filter = NULL;
6975 if (nla[NFTA_OBJ_TABLE] || nla[NFTA_OBJ_TYPE]) {
6976 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
6980 if (nla[NFTA_OBJ_TABLE]) {
6981 filter->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_ATOMIC);
6982 if (!filter->table) {
6988 if (nla[NFTA_OBJ_TYPE])
6989 filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
6996 static int nf_tables_dump_obj_done(struct netlink_callback *cb)
6998 struct nft_obj_filter *filter = cb->data;
7001 kfree(filter->table);
7008 /* called with rcu_read_lock held */
7009 static int nf_tables_getobj(struct sk_buff *skb, const struct nfnl_info *info,
7010 const struct nlattr * const nla[])
7012 struct netlink_ext_ack *extack = info->extack;
7013 u8 genmask = nft_genmask_cur(info->net);
7014 u8 family = info->nfmsg->nfgen_family;
7015 const struct nft_table *table;
7016 struct net *net = info->net;
7017 struct nft_object *obj;
7018 struct sk_buff *skb2;
7023 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
7024 struct netlink_dump_control c = {
7025 .start = nf_tables_dump_obj_start,
7026 .dump = nf_tables_dump_obj,
7027 .done = nf_tables_dump_obj_done,
7028 .module = THIS_MODULE,
7029 .data = (void *)nla,
7032 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
7035 if (!nla[NFTA_OBJ_NAME] ||
7036 !nla[NFTA_OBJ_TYPE])
7039 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask, 0);
7040 if (IS_ERR(table)) {
7041 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7042 return PTR_ERR(table);
7045 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7046 obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
7048 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7049 return PTR_ERR(obj);
7052 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
7056 if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
7060 const struct nftables_pernet *nft_net;
7063 nft_net = nft_pernet(net);
7064 buf = kasprintf(GFP_ATOMIC, "%s:%u", table->name, nft_net->base_seq);
7066 audit_log_nfcfg(buf,
7069 AUDIT_NFT_OP_OBJ_RESET,
7074 err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
7075 info->nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
7076 family, table, obj, reset);
7078 goto err_fill_obj_info;
7080 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
7087 static void nft_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj)
7089 if (obj->ops->destroy)
7090 obj->ops->destroy(ctx, obj);
7092 module_put(obj->ops->type->owner);
7093 kfree(obj->key.name);
7098 static int nf_tables_delobj(struct sk_buff *skb, const struct nfnl_info *info,
7099 const struct nlattr * const nla[])
7101 struct netlink_ext_ack *extack = info->extack;
7102 u8 genmask = nft_genmask_next(info->net);
7103 u8 family = info->nfmsg->nfgen_family;
7104 struct net *net = info->net;
7105 const struct nlattr *attr;
7106 struct nft_table *table;
7107 struct nft_object *obj;
7111 if (!nla[NFTA_OBJ_TYPE] ||
7112 (!nla[NFTA_OBJ_NAME] && !nla[NFTA_OBJ_HANDLE]))
7115 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
7116 NETLINK_CB(skb).portid);
7117 if (IS_ERR(table)) {
7118 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7119 return PTR_ERR(table);
7122 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7123 if (nla[NFTA_OBJ_HANDLE]) {
7124 attr = nla[NFTA_OBJ_HANDLE];
7125 obj = nft_obj_lookup_byhandle(table, attr, objtype, genmask);
7127 attr = nla[NFTA_OBJ_NAME];
7128 obj = nft_obj_lookup(net, table, attr, objtype, genmask);
7132 NL_SET_BAD_ATTR(extack, attr);
7133 return PTR_ERR(obj);
7136 NL_SET_BAD_ATTR(extack, attr);
7140 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7142 return nft_delobj(&ctx, obj);
7145 void nft_obj_notify(struct net *net, const struct nft_table *table,
7146 struct nft_object *obj, u32 portid, u32 seq, int event,
7147 u16 flags, int family, int report, gfp_t gfp)
7149 struct nftables_pernet *nft_net = nft_pernet(net);
7150 struct sk_buff *skb;
7152 char *buf = kasprintf(gfp, "%s:%u",
7153 table->name, nft_net->base_seq);
7155 audit_log_nfcfg(buf,
7158 event == NFT_MSG_NEWOBJ ?
7159 AUDIT_NFT_OP_OBJ_REGISTER :
7160 AUDIT_NFT_OP_OBJ_UNREGISTER,
7165 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
7168 skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
7172 err = nf_tables_fill_obj_info(skb, net, portid, seq, event,
7173 flags & (NLM_F_CREATE | NLM_F_EXCL),
7174 family, table, obj, false);
7180 nft_notify_enqueue(skb, report, &nft_net->notify_list);
7183 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
7185 EXPORT_SYMBOL_GPL(nft_obj_notify);
7187 static void nf_tables_obj_notify(const struct nft_ctx *ctx,
7188 struct nft_object *obj, int event)
7190 nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid, ctx->seq, event,
7191 ctx->flags, ctx->family, ctx->report, GFP_KERNEL);
7197 void nft_register_flowtable_type(struct nf_flowtable_type *type)
7199 nfnl_lock(NFNL_SUBSYS_NFTABLES);
7200 list_add_tail_rcu(&type->list, &nf_tables_flowtables);
7201 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7203 EXPORT_SYMBOL_GPL(nft_register_flowtable_type);
7205 void nft_unregister_flowtable_type(struct nf_flowtable_type *type)
7207 nfnl_lock(NFNL_SUBSYS_NFTABLES);
7208 list_del_rcu(&type->list);
7209 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7211 EXPORT_SYMBOL_GPL(nft_unregister_flowtable_type);
7213 static const struct nla_policy nft_flowtable_policy[NFTA_FLOWTABLE_MAX + 1] = {
7214 [NFTA_FLOWTABLE_TABLE] = { .type = NLA_STRING,
7215 .len = NFT_NAME_MAXLEN - 1 },
7216 [NFTA_FLOWTABLE_NAME] = { .type = NLA_STRING,
7217 .len = NFT_NAME_MAXLEN - 1 },
7218 [NFTA_FLOWTABLE_HOOK] = { .type = NLA_NESTED },
7219 [NFTA_FLOWTABLE_HANDLE] = { .type = NLA_U64 },
7220 [NFTA_FLOWTABLE_FLAGS] = { .type = NLA_U32 },
7223 struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table,
7224 const struct nlattr *nla, u8 genmask)
7226 struct nft_flowtable *flowtable;
7228 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
7229 if (!nla_strcmp(nla, flowtable->name) &&
7230 nft_active_genmask(flowtable, genmask))
7233 return ERR_PTR(-ENOENT);
7235 EXPORT_SYMBOL_GPL(nft_flowtable_lookup);
7237 void nf_tables_deactivate_flowtable(const struct nft_ctx *ctx,
7238 struct nft_flowtable *flowtable,
7239 enum nft_trans_phase phase)
7242 case NFT_TRANS_PREPARE:
7243 case NFT_TRANS_ABORT:
7244 case NFT_TRANS_RELEASE:
7251 EXPORT_SYMBOL_GPL(nf_tables_deactivate_flowtable);
7253 static struct nft_flowtable *
7254 nft_flowtable_lookup_byhandle(const struct nft_table *table,
7255 const struct nlattr *nla, u8 genmask)
7257 struct nft_flowtable *flowtable;
7259 list_for_each_entry(flowtable, &table->flowtables, list) {
7260 if (be64_to_cpu(nla_get_be64(nla)) == flowtable->handle &&
7261 nft_active_genmask(flowtable, genmask))
7264 return ERR_PTR(-ENOENT);
7267 struct nft_flowtable_hook {
7270 struct list_head list;
7273 static const struct nla_policy nft_flowtable_hook_policy[NFTA_FLOWTABLE_HOOK_MAX + 1] = {
7274 [NFTA_FLOWTABLE_HOOK_NUM] = { .type = NLA_U32 },
7275 [NFTA_FLOWTABLE_HOOK_PRIORITY] = { .type = NLA_U32 },
7276 [NFTA_FLOWTABLE_HOOK_DEVS] = { .type = NLA_NESTED },
7279 static int nft_flowtable_parse_hook(const struct nft_ctx *ctx,
7280 const struct nlattr *attr,
7281 struct nft_flowtable_hook *flowtable_hook,
7282 struct nft_flowtable *flowtable, bool add)
7284 struct nlattr *tb[NFTA_FLOWTABLE_HOOK_MAX + 1];
7285 struct nft_hook *hook;
7286 int hooknum, priority;
7289 INIT_LIST_HEAD(&flowtable_hook->list);
7291 err = nla_parse_nested_deprecated(tb, NFTA_FLOWTABLE_HOOK_MAX, attr,
7292 nft_flowtable_hook_policy, NULL);
7297 if (!tb[NFTA_FLOWTABLE_HOOK_NUM] ||
7298 !tb[NFTA_FLOWTABLE_HOOK_PRIORITY])
7301 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
7302 if (hooknum != NF_NETDEV_INGRESS)
7305 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
7307 flowtable_hook->priority = priority;
7308 flowtable_hook->num = hooknum;
7310 if (tb[NFTA_FLOWTABLE_HOOK_NUM]) {
7311 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
7312 if (hooknum != flowtable->hooknum)
7316 if (tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) {
7317 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
7318 if (priority != flowtable->data.priority)
7322 flowtable_hook->priority = flowtable->data.priority;
7323 flowtable_hook->num = flowtable->hooknum;
7326 if (tb[NFTA_FLOWTABLE_HOOK_DEVS]) {
7327 err = nf_tables_parse_netdev_hooks(ctx->net,
7328 tb[NFTA_FLOWTABLE_HOOK_DEVS],
7329 &flowtable_hook->list);
7334 list_for_each_entry(hook, &flowtable_hook->list, list) {
7335 hook->ops.pf = NFPROTO_NETDEV;
7336 hook->ops.hooknum = flowtable_hook->num;
7337 hook->ops.priority = flowtable_hook->priority;
7338 hook->ops.priv = &flowtable->data;
7339 hook->ops.hook = flowtable->data.type->hook;
7345 static const struct nf_flowtable_type *__nft_flowtable_type_get(u8 family)
7347 const struct nf_flowtable_type *type;
7349 list_for_each_entry(type, &nf_tables_flowtables, list) {
7350 if (family == type->family)
7356 static const struct nf_flowtable_type *
7357 nft_flowtable_type_get(struct net *net, u8 family)
7359 const struct nf_flowtable_type *type;
7361 type = __nft_flowtable_type_get(family);
7362 if (type != NULL && try_module_get(type->owner))
7365 lockdep_nfnl_nft_mutex_not_held();
7366 #ifdef CONFIG_MODULES
7368 if (nft_request_module(net, "nf-flowtable-%u", family) == -EAGAIN)
7369 return ERR_PTR(-EAGAIN);
7372 return ERR_PTR(-ENOENT);
7375 /* Only called from error and netdev event paths. */
7376 static void nft_unregister_flowtable_hook(struct net *net,
7377 struct nft_flowtable *flowtable,
7378 struct nft_hook *hook)
7380 nf_unregister_net_hook(net, &hook->ops);
7381 flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
7385 static void __nft_unregister_flowtable_net_hooks(struct net *net,
7386 struct list_head *hook_list,
7387 bool release_netdev)
7389 struct nft_hook *hook, *next;
7391 list_for_each_entry_safe(hook, next, hook_list, list) {
7392 nf_unregister_net_hook(net, &hook->ops);
7393 if (release_netdev) {
7394 list_del(&hook->list);
7395 kfree_rcu(hook, rcu);
7400 static void nft_unregister_flowtable_net_hooks(struct net *net,
7401 struct list_head *hook_list)
7403 __nft_unregister_flowtable_net_hooks(net, hook_list, false);
7406 static int nft_register_flowtable_net_hooks(struct net *net,
7407 struct nft_table *table,
7408 struct list_head *hook_list,
7409 struct nft_flowtable *flowtable)
7411 struct nft_hook *hook, *hook2, *next;
7412 struct nft_flowtable *ft;
7415 list_for_each_entry(hook, hook_list, list) {
7416 list_for_each_entry(ft, &table->flowtables, list) {
7417 if (!nft_is_active_next(net, ft))
7420 list_for_each_entry(hook2, &ft->hook_list, list) {
7421 if (hook->ops.dev == hook2->ops.dev &&
7422 hook->ops.pf == hook2->ops.pf) {
7424 goto err_unregister_net_hooks;
7429 err = flowtable->data.type->setup(&flowtable->data,
7433 goto err_unregister_net_hooks;
7435 err = nf_register_net_hook(net, &hook->ops);
7437 flowtable->data.type->setup(&flowtable->data,
7440 goto err_unregister_net_hooks;
7448 err_unregister_net_hooks:
7449 list_for_each_entry_safe(hook, next, hook_list, list) {
7453 nft_unregister_flowtable_hook(net, flowtable, hook);
7454 list_del_rcu(&hook->list);
7455 kfree_rcu(hook, rcu);
7461 static void nft_flowtable_hooks_destroy(struct list_head *hook_list)
7463 struct nft_hook *hook, *next;
7465 list_for_each_entry_safe(hook, next, hook_list, list) {
7466 list_del_rcu(&hook->list);
7467 kfree_rcu(hook, rcu);
7471 static int nft_flowtable_update(struct nft_ctx *ctx, const struct nlmsghdr *nlh,
7472 struct nft_flowtable *flowtable)
7474 const struct nlattr * const *nla = ctx->nla;
7475 struct nft_flowtable_hook flowtable_hook;
7476 struct nft_hook *hook, *next;
7477 struct nft_trans *trans;
7478 bool unregister = false;
7482 err = nft_flowtable_parse_hook(ctx, nla[NFTA_FLOWTABLE_HOOK],
7483 &flowtable_hook, flowtable, false);
7487 list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
7488 if (nft_hook_list_find(&flowtable->hook_list, hook)) {
7489 list_del(&hook->list);
7494 if (nla[NFTA_FLOWTABLE_FLAGS]) {
7495 flags = ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
7496 if (flags & ~NFT_FLOWTABLE_MASK) {
7498 goto err_flowtable_update_hook;
7500 if ((flowtable->data.flags & NFT_FLOWTABLE_HW_OFFLOAD) ^
7501 (flags & NFT_FLOWTABLE_HW_OFFLOAD)) {
7503 goto err_flowtable_update_hook;
7506 flags = flowtable->data.flags;
7509 err = nft_register_flowtable_net_hooks(ctx->net, ctx->table,
7510 &flowtable_hook.list, flowtable);
7512 goto err_flowtable_update_hook;
7514 trans = nft_trans_alloc(ctx, NFT_MSG_NEWFLOWTABLE,
7515 sizeof(struct nft_trans_flowtable));
7519 goto err_flowtable_update_hook;
7522 nft_trans_flowtable_flags(trans) = flags;
7523 nft_trans_flowtable(trans) = flowtable;
7524 nft_trans_flowtable_update(trans) = true;
7525 INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
7526 list_splice(&flowtable_hook.list, &nft_trans_flowtable_hooks(trans));
7528 nft_trans_commit_list_add_tail(ctx->net, trans);
7532 err_flowtable_update_hook:
7533 list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
7535 nft_unregister_flowtable_hook(ctx->net, flowtable, hook);
7536 list_del_rcu(&hook->list);
7537 kfree_rcu(hook, rcu);
7544 static int nf_tables_newflowtable(struct sk_buff *skb,
7545 const struct nfnl_info *info,
7546 const struct nlattr * const nla[])
7548 struct netlink_ext_ack *extack = info->extack;
7549 struct nft_flowtable_hook flowtable_hook;
7550 u8 genmask = nft_genmask_next(info->net);
7551 u8 family = info->nfmsg->nfgen_family;
7552 const struct nf_flowtable_type *type;
7553 struct nft_flowtable *flowtable;
7554 struct nft_hook *hook, *next;
7555 struct net *net = info->net;
7556 struct nft_table *table;
7560 if (!nla[NFTA_FLOWTABLE_TABLE] ||
7561 !nla[NFTA_FLOWTABLE_NAME] ||
7562 !nla[NFTA_FLOWTABLE_HOOK])
7565 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
7566 genmask, NETLINK_CB(skb).portid);
7567 if (IS_ERR(table)) {
7568 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
7569 return PTR_ERR(table);
7572 flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
7574 if (IS_ERR(flowtable)) {
7575 err = PTR_ERR(flowtable);
7576 if (err != -ENOENT) {
7577 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
7581 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
7582 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
7586 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7588 return nft_flowtable_update(&ctx, info->nlh, flowtable);
7591 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7593 flowtable = kzalloc(sizeof(*flowtable), GFP_KERNEL);
7597 flowtable->table = table;
7598 flowtable->handle = nf_tables_alloc_handle(table);
7599 INIT_LIST_HEAD(&flowtable->hook_list);
7601 flowtable->name = nla_strdup(nla[NFTA_FLOWTABLE_NAME], GFP_KERNEL);
7602 if (!flowtable->name) {
7607 type = nft_flowtable_type_get(net, family);
7609 err = PTR_ERR(type);
7613 if (nla[NFTA_FLOWTABLE_FLAGS]) {
7614 flowtable->data.flags =
7615 ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
7616 if (flowtable->data.flags & ~NFT_FLOWTABLE_MASK) {
7622 write_pnet(&flowtable->data.net, net);
7623 flowtable->data.type = type;
7624 err = type->init(&flowtable->data);
7628 err = nft_flowtable_parse_hook(&ctx, nla[NFTA_FLOWTABLE_HOOK],
7629 &flowtable_hook, flowtable, true);
7633 list_splice(&flowtable_hook.list, &flowtable->hook_list);
7634 flowtable->data.priority = flowtable_hook.priority;
7635 flowtable->hooknum = flowtable_hook.num;
7637 err = nft_register_flowtable_net_hooks(ctx.net, table,
7638 &flowtable->hook_list,
7641 nft_flowtable_hooks_destroy(&flowtable->hook_list);
7645 err = nft_trans_flowtable_add(&ctx, NFT_MSG_NEWFLOWTABLE, flowtable);
7649 list_add_tail_rcu(&flowtable->list, &table->flowtables);
7654 list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
7655 nft_unregister_flowtable_hook(net, flowtable, hook);
7656 list_del_rcu(&hook->list);
7657 kfree_rcu(hook, rcu);
7660 flowtable->data.type->free(&flowtable->data);
7662 module_put(type->owner);
7664 kfree(flowtable->name);
7670 static void nft_flowtable_hook_release(struct nft_flowtable_hook *flowtable_hook)
7672 struct nft_hook *this, *next;
7674 list_for_each_entry_safe(this, next, &flowtable_hook->list, list) {
7675 list_del(&this->list);
7680 static int nft_delflowtable_hook(struct nft_ctx *ctx,
7681 struct nft_flowtable *flowtable)
7683 const struct nlattr * const *nla = ctx->nla;
7684 struct nft_flowtable_hook flowtable_hook;
7685 LIST_HEAD(flowtable_del_list);
7686 struct nft_hook *this, *hook;
7687 struct nft_trans *trans;
7690 err = nft_flowtable_parse_hook(ctx, nla[NFTA_FLOWTABLE_HOOK],
7691 &flowtable_hook, flowtable, false);
7695 list_for_each_entry(this, &flowtable_hook.list, list) {
7696 hook = nft_hook_list_find(&flowtable->hook_list, this);
7699 goto err_flowtable_del_hook;
7701 list_move(&hook->list, &flowtable_del_list);
7704 trans = nft_trans_alloc(ctx, NFT_MSG_DELFLOWTABLE,
7705 sizeof(struct nft_trans_flowtable));
7708 goto err_flowtable_del_hook;
7711 nft_trans_flowtable(trans) = flowtable;
7712 nft_trans_flowtable_update(trans) = true;
7713 INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
7714 list_splice(&flowtable_del_list, &nft_trans_flowtable_hooks(trans));
7715 nft_flowtable_hook_release(&flowtable_hook);
7717 nft_trans_commit_list_add_tail(ctx->net, trans);
7721 err_flowtable_del_hook:
7722 list_splice(&flowtable_del_list, &flowtable->hook_list);
7723 nft_flowtable_hook_release(&flowtable_hook);
7728 static int nf_tables_delflowtable(struct sk_buff *skb,
7729 const struct nfnl_info *info,
7730 const struct nlattr * const nla[])
7732 struct netlink_ext_ack *extack = info->extack;
7733 u8 genmask = nft_genmask_next(info->net);
7734 u8 family = info->nfmsg->nfgen_family;
7735 struct nft_flowtable *flowtable;
7736 struct net *net = info->net;
7737 const struct nlattr *attr;
7738 struct nft_table *table;
7741 if (!nla[NFTA_FLOWTABLE_TABLE] ||
7742 (!nla[NFTA_FLOWTABLE_NAME] &&
7743 !nla[NFTA_FLOWTABLE_HANDLE]))
7746 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
7747 genmask, NETLINK_CB(skb).portid);
7748 if (IS_ERR(table)) {
7749 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
7750 return PTR_ERR(table);
7753 if (nla[NFTA_FLOWTABLE_HANDLE]) {
7754 attr = nla[NFTA_FLOWTABLE_HANDLE];
7755 flowtable = nft_flowtable_lookup_byhandle(table, attr, genmask);
7757 attr = nla[NFTA_FLOWTABLE_NAME];
7758 flowtable = nft_flowtable_lookup(table, attr, genmask);
7761 if (IS_ERR(flowtable)) {
7762 NL_SET_BAD_ATTR(extack, attr);
7763 return PTR_ERR(flowtable);
7766 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7768 if (nla[NFTA_FLOWTABLE_HOOK])
7769 return nft_delflowtable_hook(&ctx, flowtable);
7771 if (flowtable->use > 0) {
7772 NL_SET_BAD_ATTR(extack, attr);
7776 return nft_delflowtable(&ctx, flowtable);
7779 static int nf_tables_fill_flowtable_info(struct sk_buff *skb, struct net *net,
7780 u32 portid, u32 seq, int event,
7781 u32 flags, int family,
7782 struct nft_flowtable *flowtable,
7783 struct list_head *hook_list)
7785 struct nlattr *nest, *nest_devs;
7786 struct nft_hook *hook;
7787 struct nlmsghdr *nlh;
7789 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
7790 nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
7791 NFNETLINK_V0, nft_base_seq(net));
7793 goto nla_put_failure;
7795 if (nla_put_string(skb, NFTA_FLOWTABLE_TABLE, flowtable->table->name) ||
7796 nla_put_string(skb, NFTA_FLOWTABLE_NAME, flowtable->name) ||
7797 nla_put_be32(skb, NFTA_FLOWTABLE_USE, htonl(flowtable->use)) ||
7798 nla_put_be64(skb, NFTA_FLOWTABLE_HANDLE, cpu_to_be64(flowtable->handle),
7799 NFTA_FLOWTABLE_PAD) ||
7800 nla_put_be32(skb, NFTA_FLOWTABLE_FLAGS, htonl(flowtable->data.flags)))
7801 goto nla_put_failure;
7803 nest = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK);
7805 goto nla_put_failure;
7806 if (nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_NUM, htonl(flowtable->hooknum)) ||
7807 nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_PRIORITY, htonl(flowtable->data.priority)))
7808 goto nla_put_failure;
7810 nest_devs = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK_DEVS);
7812 goto nla_put_failure;
7814 list_for_each_entry_rcu(hook, hook_list, list) {
7815 if (nla_put_string(skb, NFTA_DEVICE_NAME, hook->ops.dev->name))
7816 goto nla_put_failure;
7818 nla_nest_end(skb, nest_devs);
7819 nla_nest_end(skb, nest);
7821 nlmsg_end(skb, nlh);
7825 nlmsg_trim(skb, nlh);
7829 struct nft_flowtable_filter {
7833 static int nf_tables_dump_flowtable(struct sk_buff *skb,
7834 struct netlink_callback *cb)
7836 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
7837 struct nft_flowtable_filter *filter = cb->data;
7838 unsigned int idx = 0, s_idx = cb->args[0];
7839 struct net *net = sock_net(skb->sk);
7840 int family = nfmsg->nfgen_family;
7841 struct nft_flowtable *flowtable;
7842 struct nftables_pernet *nft_net;
7843 const struct nft_table *table;
7846 nft_net = nft_pernet(net);
7847 cb->seq = READ_ONCE(nft_net->base_seq);
7849 list_for_each_entry_rcu(table, &nft_net->tables, list) {
7850 if (family != NFPROTO_UNSPEC && family != table->family)
7853 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
7854 if (!nft_is_active(net, flowtable))
7859 memset(&cb->args[1], 0,
7860 sizeof(cb->args) - sizeof(cb->args[0]));
7861 if (filter && filter->table &&
7862 strcmp(filter->table, table->name))
7865 if (nf_tables_fill_flowtable_info(skb, net, NETLINK_CB(cb->skb).portid,
7867 NFT_MSG_NEWFLOWTABLE,
7868 NLM_F_MULTI | NLM_F_APPEND,
7871 &flowtable->hook_list) < 0)
7874 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7886 static int nf_tables_dump_flowtable_start(struct netlink_callback *cb)
7888 const struct nlattr * const *nla = cb->data;
7889 struct nft_flowtable_filter *filter = NULL;
7891 if (nla[NFTA_FLOWTABLE_TABLE]) {
7892 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
7896 filter->table = nla_strdup(nla[NFTA_FLOWTABLE_TABLE],
7898 if (!filter->table) {
7908 static int nf_tables_dump_flowtable_done(struct netlink_callback *cb)
7910 struct nft_flowtable_filter *filter = cb->data;
7915 kfree(filter->table);
7921 /* called with rcu_read_lock held */
7922 static int nf_tables_getflowtable(struct sk_buff *skb,
7923 const struct nfnl_info *info,
7924 const struct nlattr * const nla[])
7926 u8 genmask = nft_genmask_cur(info->net);
7927 u8 family = info->nfmsg->nfgen_family;
7928 struct nft_flowtable *flowtable;
7929 const struct nft_table *table;
7930 struct net *net = info->net;
7931 struct sk_buff *skb2;
7934 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
7935 struct netlink_dump_control c = {
7936 .start = nf_tables_dump_flowtable_start,
7937 .dump = nf_tables_dump_flowtable,
7938 .done = nf_tables_dump_flowtable_done,
7939 .module = THIS_MODULE,
7940 .data = (void *)nla,
7943 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
7946 if (!nla[NFTA_FLOWTABLE_NAME])
7949 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
7952 return PTR_ERR(table);
7954 flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
7956 if (IS_ERR(flowtable))
7957 return PTR_ERR(flowtable);
7959 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
7963 err = nf_tables_fill_flowtable_info(skb2, net, NETLINK_CB(skb).portid,
7964 info->nlh->nlmsg_seq,
7965 NFT_MSG_NEWFLOWTABLE, 0, family,
7966 flowtable, &flowtable->hook_list);
7968 goto err_fill_flowtable_info;
7970 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
7972 err_fill_flowtable_info:
7977 static void nf_tables_flowtable_notify(struct nft_ctx *ctx,
7978 struct nft_flowtable *flowtable,
7979 struct list_head *hook_list,
7982 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
7983 struct sk_buff *skb;
7988 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
7991 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
7995 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
7996 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
7998 err = nf_tables_fill_flowtable_info(skb, ctx->net, ctx->portid,
7999 ctx->seq, event, flags,
8000 ctx->family, flowtable, hook_list);
8006 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
8009 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
8012 static void nf_tables_flowtable_destroy(struct nft_flowtable *flowtable)
8014 struct nft_hook *hook, *next;
8016 flowtable->data.type->free(&flowtable->data);
8017 list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
8018 flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
8020 list_del_rcu(&hook->list);
8023 kfree(flowtable->name);
8024 module_put(flowtable->data.type->owner);
8028 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
8029 u32 portid, u32 seq)
8031 struct nftables_pernet *nft_net = nft_pernet(net);
8032 struct nlmsghdr *nlh;
8033 char buf[TASK_COMM_LEN];
8034 int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN);
8036 nlh = nfnl_msg_put(skb, portid, seq, event, 0, AF_UNSPEC,
8037 NFNETLINK_V0, nft_base_seq(net));
8039 goto nla_put_failure;
8041 if (nla_put_be32(skb, NFTA_GEN_ID, htonl(nft_net->base_seq)) ||
8042 nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) ||
8043 nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current)))
8044 goto nla_put_failure;
8046 nlmsg_end(skb, nlh);
8050 nlmsg_trim(skb, nlh);
8054 static void nft_flowtable_event(unsigned long event, struct net_device *dev,
8055 struct nft_flowtable *flowtable)
8057 struct nft_hook *hook;
8059 list_for_each_entry(hook, &flowtable->hook_list, list) {
8060 if (hook->ops.dev != dev)
8063 /* flow_offload_netdev_event() cleans up entries for us. */
8064 nft_unregister_flowtable_hook(dev_net(dev), flowtable, hook);
8065 list_del_rcu(&hook->list);
8066 kfree_rcu(hook, rcu);
8071 static int nf_tables_flowtable_event(struct notifier_block *this,
8072 unsigned long event, void *ptr)
8074 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
8075 struct nft_flowtable *flowtable;
8076 struct nftables_pernet *nft_net;
8077 struct nft_table *table;
8080 if (event != NETDEV_UNREGISTER)
8084 nft_net = nft_pernet(net);
8085 mutex_lock(&nft_net->commit_mutex);
8086 list_for_each_entry(table, &nft_net->tables, list) {
8087 list_for_each_entry(flowtable, &table->flowtables, list) {
8088 nft_flowtable_event(event, dev, flowtable);
8091 mutex_unlock(&nft_net->commit_mutex);
8096 static struct notifier_block nf_tables_flowtable_notifier = {
8097 .notifier_call = nf_tables_flowtable_event,
8100 static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
8103 struct nlmsghdr *nlh = nlmsg_hdr(skb);
8104 struct sk_buff *skb2;
8107 if (!nlmsg_report(nlh) &&
8108 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
8111 skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
8115 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
8122 nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
8123 nlmsg_report(nlh), GFP_KERNEL);
8126 nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
8130 static int nf_tables_getgen(struct sk_buff *skb, const struct nfnl_info *info,
8131 const struct nlattr * const nla[])
8133 struct sk_buff *skb2;
8136 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
8140 err = nf_tables_fill_gen_info(skb2, info->net, NETLINK_CB(skb).portid,
8141 info->nlh->nlmsg_seq);
8143 goto err_fill_gen_info;
8145 return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid);
8152 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
8153 [NFT_MSG_NEWTABLE] = {
8154 .call = nf_tables_newtable,
8155 .type = NFNL_CB_BATCH,
8156 .attr_count = NFTA_TABLE_MAX,
8157 .policy = nft_table_policy,
8159 [NFT_MSG_GETTABLE] = {
8160 .call = nf_tables_gettable,
8161 .type = NFNL_CB_RCU,
8162 .attr_count = NFTA_TABLE_MAX,
8163 .policy = nft_table_policy,
8165 [NFT_MSG_DELTABLE] = {
8166 .call = nf_tables_deltable,
8167 .type = NFNL_CB_BATCH,
8168 .attr_count = NFTA_TABLE_MAX,
8169 .policy = nft_table_policy,
8171 [NFT_MSG_NEWCHAIN] = {
8172 .call = nf_tables_newchain,
8173 .type = NFNL_CB_BATCH,
8174 .attr_count = NFTA_CHAIN_MAX,
8175 .policy = nft_chain_policy,
8177 [NFT_MSG_GETCHAIN] = {
8178 .call = nf_tables_getchain,
8179 .type = NFNL_CB_RCU,
8180 .attr_count = NFTA_CHAIN_MAX,
8181 .policy = nft_chain_policy,
8183 [NFT_MSG_DELCHAIN] = {
8184 .call = nf_tables_delchain,
8185 .type = NFNL_CB_BATCH,
8186 .attr_count = NFTA_CHAIN_MAX,
8187 .policy = nft_chain_policy,
8189 [NFT_MSG_NEWRULE] = {
8190 .call = nf_tables_newrule,
8191 .type = NFNL_CB_BATCH,
8192 .attr_count = NFTA_RULE_MAX,
8193 .policy = nft_rule_policy,
8195 [NFT_MSG_GETRULE] = {
8196 .call = nf_tables_getrule,
8197 .type = NFNL_CB_RCU,
8198 .attr_count = NFTA_RULE_MAX,
8199 .policy = nft_rule_policy,
8201 [NFT_MSG_DELRULE] = {
8202 .call = nf_tables_delrule,
8203 .type = NFNL_CB_BATCH,
8204 .attr_count = NFTA_RULE_MAX,
8205 .policy = nft_rule_policy,
8207 [NFT_MSG_NEWSET] = {
8208 .call = nf_tables_newset,
8209 .type = NFNL_CB_BATCH,
8210 .attr_count = NFTA_SET_MAX,
8211 .policy = nft_set_policy,
8213 [NFT_MSG_GETSET] = {
8214 .call = nf_tables_getset,
8215 .type = NFNL_CB_RCU,
8216 .attr_count = NFTA_SET_MAX,
8217 .policy = nft_set_policy,
8219 [NFT_MSG_DELSET] = {
8220 .call = nf_tables_delset,
8221 .type = NFNL_CB_BATCH,
8222 .attr_count = NFTA_SET_MAX,
8223 .policy = nft_set_policy,
8225 [NFT_MSG_NEWSETELEM] = {
8226 .call = nf_tables_newsetelem,
8227 .type = NFNL_CB_BATCH,
8228 .attr_count = NFTA_SET_ELEM_LIST_MAX,
8229 .policy = nft_set_elem_list_policy,
8231 [NFT_MSG_GETSETELEM] = {
8232 .call = nf_tables_getsetelem,
8233 .type = NFNL_CB_RCU,
8234 .attr_count = NFTA_SET_ELEM_LIST_MAX,
8235 .policy = nft_set_elem_list_policy,
8237 [NFT_MSG_DELSETELEM] = {
8238 .call = nf_tables_delsetelem,
8239 .type = NFNL_CB_BATCH,
8240 .attr_count = NFTA_SET_ELEM_LIST_MAX,
8241 .policy = nft_set_elem_list_policy,
8243 [NFT_MSG_GETGEN] = {
8244 .call = nf_tables_getgen,
8245 .type = NFNL_CB_RCU,
8247 [NFT_MSG_NEWOBJ] = {
8248 .call = nf_tables_newobj,
8249 .type = NFNL_CB_BATCH,
8250 .attr_count = NFTA_OBJ_MAX,
8251 .policy = nft_obj_policy,
8253 [NFT_MSG_GETOBJ] = {
8254 .call = nf_tables_getobj,
8255 .type = NFNL_CB_RCU,
8256 .attr_count = NFTA_OBJ_MAX,
8257 .policy = nft_obj_policy,
8259 [NFT_MSG_DELOBJ] = {
8260 .call = nf_tables_delobj,
8261 .type = NFNL_CB_BATCH,
8262 .attr_count = NFTA_OBJ_MAX,
8263 .policy = nft_obj_policy,
8265 [NFT_MSG_GETOBJ_RESET] = {
8266 .call = nf_tables_getobj,
8267 .type = NFNL_CB_RCU,
8268 .attr_count = NFTA_OBJ_MAX,
8269 .policy = nft_obj_policy,
8271 [NFT_MSG_NEWFLOWTABLE] = {
8272 .call = nf_tables_newflowtable,
8273 .type = NFNL_CB_BATCH,
8274 .attr_count = NFTA_FLOWTABLE_MAX,
8275 .policy = nft_flowtable_policy,
8277 [NFT_MSG_GETFLOWTABLE] = {
8278 .call = nf_tables_getflowtable,
8279 .type = NFNL_CB_RCU,
8280 .attr_count = NFTA_FLOWTABLE_MAX,
8281 .policy = nft_flowtable_policy,
8283 [NFT_MSG_DELFLOWTABLE] = {
8284 .call = nf_tables_delflowtable,
8285 .type = NFNL_CB_BATCH,
8286 .attr_count = NFTA_FLOWTABLE_MAX,
8287 .policy = nft_flowtable_policy,
8291 static int nf_tables_validate(struct net *net)
8293 struct nftables_pernet *nft_net = nft_pernet(net);
8294 struct nft_table *table;
8296 switch (nft_net->validate_state) {
8297 case NFT_VALIDATE_SKIP:
8299 case NFT_VALIDATE_NEED:
8300 nft_validate_state_update(net, NFT_VALIDATE_DO);
8302 case NFT_VALIDATE_DO:
8303 list_for_each_entry(table, &nft_net->tables, list) {
8304 if (nft_table_validate(net, table) < 0)
8313 /* a drop policy has to be deferred until all rules have been activated,
8314 * otherwise a large ruleset that contains a drop-policy base chain will
8315 * cause all packets to get dropped until the full transaction has been
8318 * We defer the drop policy until the transaction has been finalized.
8320 static void nft_chain_commit_drop_policy(struct nft_trans *trans)
8322 struct nft_base_chain *basechain;
8324 if (nft_trans_chain_policy(trans) != NF_DROP)
8327 if (!nft_is_base_chain(trans->ctx.chain))
8330 basechain = nft_base_chain(trans->ctx.chain);
8331 basechain->policy = NF_DROP;
8334 static void nft_chain_commit_update(struct nft_trans *trans)
8336 struct nft_base_chain *basechain;
8338 if (nft_trans_chain_name(trans)) {
8339 rhltable_remove(&trans->ctx.table->chains_ht,
8340 &trans->ctx.chain->rhlhead,
8341 nft_chain_ht_params);
8342 swap(trans->ctx.chain->name, nft_trans_chain_name(trans));
8343 rhltable_insert_key(&trans->ctx.table->chains_ht,
8344 trans->ctx.chain->name,
8345 &trans->ctx.chain->rhlhead,
8346 nft_chain_ht_params);
8349 if (!nft_is_base_chain(trans->ctx.chain))
8352 nft_chain_stats_replace(trans);
8354 basechain = nft_base_chain(trans->ctx.chain);
8356 switch (nft_trans_chain_policy(trans)) {
8359 basechain->policy = nft_trans_chain_policy(trans);
8364 static void nft_obj_commit_update(struct nft_trans *trans)
8366 struct nft_object *newobj;
8367 struct nft_object *obj;
8369 obj = nft_trans_obj(trans);
8370 newobj = nft_trans_obj_newobj(trans);
8372 if (obj->ops->update)
8373 obj->ops->update(obj, newobj);
8375 nft_obj_destroy(&trans->ctx, newobj);
8378 static void nft_commit_release(struct nft_trans *trans)
8380 switch (trans->msg_type) {
8381 case NFT_MSG_DELTABLE:
8382 nf_tables_table_destroy(&trans->ctx);
8384 case NFT_MSG_NEWCHAIN:
8385 free_percpu(nft_trans_chain_stats(trans));
8386 kfree(nft_trans_chain_name(trans));
8388 case NFT_MSG_DELCHAIN:
8389 nf_tables_chain_destroy(&trans->ctx);
8391 case NFT_MSG_DELRULE:
8392 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
8394 case NFT_MSG_DELSET:
8395 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
8397 case NFT_MSG_DELSETELEM:
8398 nf_tables_set_elem_destroy(&trans->ctx,
8399 nft_trans_elem_set(trans),
8400 nft_trans_elem(trans).priv);
8402 case NFT_MSG_DELOBJ:
8403 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
8405 case NFT_MSG_DELFLOWTABLE:
8406 if (nft_trans_flowtable_update(trans))
8407 nft_flowtable_hooks_destroy(&nft_trans_flowtable_hooks(trans));
8409 nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
8414 put_net(trans->ctx.net);
8419 static void nf_tables_trans_destroy_work(struct work_struct *w)
8421 struct nft_trans *trans, *next;
8424 spin_lock(&nf_tables_destroy_list_lock);
8425 list_splice_init(&nf_tables_destroy_list, &head);
8426 spin_unlock(&nf_tables_destroy_list_lock);
8428 if (list_empty(&head))
8433 list_for_each_entry_safe(trans, next, &head, list) {
8434 list_del(&trans->list);
8435 nft_commit_release(trans);
8439 void nf_tables_trans_destroy_flush_work(void)
8441 flush_work(&trans_destroy_work);
8443 EXPORT_SYMBOL_GPL(nf_tables_trans_destroy_flush_work);
8445 static int nf_tables_commit_chain_prepare(struct net *net, struct nft_chain *chain)
8447 struct nft_rule *rule;
8448 unsigned int alloc = 0;
8451 /* already handled or inactive chain? */
8452 if (chain->rules_next || !nft_is_active_next(net, chain))
8455 rule = list_entry(&chain->rules, struct nft_rule, list);
8458 list_for_each_entry_continue(rule, &chain->rules, list) {
8459 if (nft_is_active_next(net, rule))
8463 chain->rules_next = nf_tables_chain_alloc_rules(chain, alloc);
8464 if (!chain->rules_next)
8467 list_for_each_entry_continue(rule, &chain->rules, list) {
8468 if (nft_is_active_next(net, rule))
8469 chain->rules_next[i++] = rule;
8472 chain->rules_next[i] = NULL;
8476 static void nf_tables_commit_chain_prepare_cancel(struct net *net)
8478 struct nftables_pernet *nft_net = nft_pernet(net);
8479 struct nft_trans *trans, *next;
8481 list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
8482 struct nft_chain *chain = trans->ctx.chain;
8484 if (trans->msg_type == NFT_MSG_NEWRULE ||
8485 trans->msg_type == NFT_MSG_DELRULE) {
8486 kvfree(chain->rules_next);
8487 chain->rules_next = NULL;
8492 static void __nf_tables_commit_chain_free_rules_old(struct rcu_head *h)
8494 struct nft_rules_old *o = container_of(h, struct nft_rules_old, h);
8499 static void nf_tables_commit_chain_free_rules_old(struct nft_rule **rules)
8501 struct nft_rule **r = rules;
8502 struct nft_rules_old *old;
8507 r++; /* rcu_head is after end marker */
8511 call_rcu(&old->h, __nf_tables_commit_chain_free_rules_old);
8514 static void nf_tables_commit_chain(struct net *net, struct nft_chain *chain)
8516 struct nft_rule **g0, **g1;
8519 next_genbit = nft_gencursor_next(net);
8521 g0 = rcu_dereference_protected(chain->rules_gen_0,
8522 lockdep_commit_lock_is_held(net));
8523 g1 = rcu_dereference_protected(chain->rules_gen_1,
8524 lockdep_commit_lock_is_held(net));
8526 /* No changes to this chain? */
8527 if (chain->rules_next == NULL) {
8528 /* chain had no change in last or next generation */
8532 * chain had no change in this generation; make sure next
8533 * one uses same rules as current generation.
8536 rcu_assign_pointer(chain->rules_gen_1, g0);
8537 nf_tables_commit_chain_free_rules_old(g1);
8539 rcu_assign_pointer(chain->rules_gen_0, g1);
8540 nf_tables_commit_chain_free_rules_old(g0);
8547 rcu_assign_pointer(chain->rules_gen_1, chain->rules_next);
8549 rcu_assign_pointer(chain->rules_gen_0, chain->rules_next);
8551 chain->rules_next = NULL;
8557 nf_tables_commit_chain_free_rules_old(g1);
8559 nf_tables_commit_chain_free_rules_old(g0);
8562 static void nft_obj_del(struct nft_object *obj)
8564 rhltable_remove(&nft_objname_ht, &obj->rhlhead, nft_objname_ht_params);
8565 list_del_rcu(&obj->list);
8568 void nft_chain_del(struct nft_chain *chain)
8570 struct nft_table *table = chain->table;
8572 WARN_ON_ONCE(rhltable_remove(&table->chains_ht, &chain->rhlhead,
8573 nft_chain_ht_params));
8574 list_del_rcu(&chain->list);
8577 static void nf_tables_module_autoload_cleanup(struct net *net)
8579 struct nftables_pernet *nft_net = nft_pernet(net);
8580 struct nft_module_request *req, *next;
8582 WARN_ON_ONCE(!list_empty(&nft_net->commit_list));
8583 list_for_each_entry_safe(req, next, &nft_net->module_list, list) {
8584 WARN_ON_ONCE(!req->done);
8585 list_del(&req->list);
8590 static void nf_tables_commit_release(struct net *net)
8592 struct nftables_pernet *nft_net = nft_pernet(net);
8593 struct nft_trans *trans;
8595 /* all side effects have to be made visible.
8596 * For example, if a chain named 'foo' has been deleted, a
8597 * new transaction must not find it anymore.
8599 * Memory reclaim happens asynchronously from work queue
8600 * to prevent expensive synchronize_rcu() in commit phase.
8602 if (list_empty(&nft_net->commit_list)) {
8603 nf_tables_module_autoload_cleanup(net);
8604 mutex_unlock(&nft_net->commit_mutex);
8608 trans = list_last_entry(&nft_net->commit_list,
8609 struct nft_trans, list);
8610 get_net(trans->ctx.net);
8611 WARN_ON_ONCE(trans->put_net);
8613 trans->put_net = true;
8614 spin_lock(&nf_tables_destroy_list_lock);
8615 list_splice_tail_init(&nft_net->commit_list, &nf_tables_destroy_list);
8616 spin_unlock(&nf_tables_destroy_list_lock);
8618 nf_tables_module_autoload_cleanup(net);
8619 schedule_work(&trans_destroy_work);
8621 mutex_unlock(&nft_net->commit_mutex);
8624 static void nft_commit_notify(struct net *net, u32 portid)
8626 struct nftables_pernet *nft_net = nft_pernet(net);
8627 struct sk_buff *batch_skb = NULL, *nskb, *skb;
8628 unsigned char *data;
8631 list_for_each_entry_safe(skb, nskb, &nft_net->notify_list, list) {
8635 len = NLMSG_GOODSIZE - skb->len;
8636 list_del(&skb->list);
8640 if (len > 0 && NFT_CB(skb).report == NFT_CB(batch_skb).report) {
8641 data = skb_put(batch_skb, skb->len);
8642 memcpy(data, skb->data, skb->len);
8643 list_del(&skb->list);
8647 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
8648 NFT_CB(batch_skb).report, GFP_KERNEL);
8653 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
8654 NFT_CB(batch_skb).report, GFP_KERNEL);
8657 WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
8660 static int nf_tables_commit_audit_alloc(struct list_head *adl,
8661 struct nft_table *table)
8663 struct nft_audit_data *adp;
8665 list_for_each_entry(adp, adl, list) {
8666 if (adp->table == table)
8669 adp = kzalloc(sizeof(*adp), GFP_KERNEL);
8673 list_add(&adp->list, adl);
8677 static void nf_tables_commit_audit_free(struct list_head *adl)
8679 struct nft_audit_data *adp, *adn;
8681 list_for_each_entry_safe(adp, adn, adl, list) {
8682 list_del(&adp->list);
8687 static void nf_tables_commit_audit_collect(struct list_head *adl,
8688 struct nft_table *table, u32 op)
8690 struct nft_audit_data *adp;
8692 list_for_each_entry(adp, adl, list) {
8693 if (adp->table == table)
8696 WARN_ONCE(1, "table=%s not expected in commit list", table->name);
8700 if (!adp->op || adp->op > op)
8704 #define AUNFTABLENAMELEN (NFT_TABLE_MAXNAMELEN + 22)
8706 static void nf_tables_commit_audit_log(struct list_head *adl, u32 generation)
8708 struct nft_audit_data *adp, *adn;
8709 char aubuf[AUNFTABLENAMELEN];
8711 list_for_each_entry_safe(adp, adn, adl, list) {
8712 snprintf(aubuf, AUNFTABLENAMELEN, "%s:%u", adp->table->name,
8714 audit_log_nfcfg(aubuf, adp->table->family, adp->entries,
8715 nft2audit_op[adp->op], GFP_KERNEL);
8716 list_del(&adp->list);
8721 static int nf_tables_commit(struct net *net, struct sk_buff *skb)
8723 struct nftables_pernet *nft_net = nft_pernet(net);
8724 struct nft_trans *trans, *next;
8725 struct nft_trans_elem *te;
8726 struct nft_chain *chain;
8727 struct nft_table *table;
8728 unsigned int base_seq;
8732 if (list_empty(&nft_net->commit_list)) {
8733 mutex_unlock(&nft_net->commit_mutex);
8737 /* 0. Validate ruleset, otherwise roll back for error reporting. */
8738 if (nf_tables_validate(net) < 0)
8741 err = nft_flow_rule_offload_commit(net);
8745 /* 1. Allocate space for next generation rules_gen_X[] */
8746 list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
8749 ret = nf_tables_commit_audit_alloc(&adl, trans->ctx.table);
8751 nf_tables_commit_chain_prepare_cancel(net);
8752 nf_tables_commit_audit_free(&adl);
8755 if (trans->msg_type == NFT_MSG_NEWRULE ||
8756 trans->msg_type == NFT_MSG_DELRULE) {
8757 chain = trans->ctx.chain;
8759 ret = nf_tables_commit_chain_prepare(net, chain);
8761 nf_tables_commit_chain_prepare_cancel(net);
8762 nf_tables_commit_audit_free(&adl);
8768 /* step 2. Make rules_gen_X visible to packet path */
8769 list_for_each_entry(table, &nft_net->tables, list) {
8770 list_for_each_entry(chain, &table->chains, list)
8771 nf_tables_commit_chain(net, chain);
8775 * Bump generation counter, invalidate any dump in progress.
8776 * Cannot fail after this point.
8778 base_seq = READ_ONCE(nft_net->base_seq);
8779 while (++base_seq == 0)
8782 WRITE_ONCE(nft_net->base_seq, base_seq);
8784 /* step 3. Start new generation, rules_gen_X now in use. */
8785 net->nft.gencursor = nft_gencursor_next(net);
8787 list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
8788 nf_tables_commit_audit_collect(&adl, trans->ctx.table,
8790 switch (trans->msg_type) {
8791 case NFT_MSG_NEWTABLE:
8792 if (nft_trans_table_update(trans)) {
8793 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
8794 nft_trans_destroy(trans);
8797 if (trans->ctx.table->flags & NFT_TABLE_F_DORMANT)
8798 nf_tables_table_disable(net, trans->ctx.table);
8800 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
8802 nft_clear(net, trans->ctx.table);
8804 nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
8805 nft_trans_destroy(trans);
8807 case NFT_MSG_DELTABLE:
8808 list_del_rcu(&trans->ctx.table->list);
8809 nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE);
8811 case NFT_MSG_NEWCHAIN:
8812 if (nft_trans_chain_update(trans)) {
8813 nft_chain_commit_update(trans);
8814 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
8815 /* trans destroyed after rcu grace period */
8817 nft_chain_commit_drop_policy(trans);
8818 nft_clear(net, trans->ctx.chain);
8819 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
8820 nft_trans_destroy(trans);
8823 case NFT_MSG_DELCHAIN:
8824 nft_chain_del(trans->ctx.chain);
8825 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN);
8826 nf_tables_unregister_hook(trans->ctx.net,
8830 case NFT_MSG_NEWRULE:
8831 nft_clear(trans->ctx.net, nft_trans_rule(trans));
8832 nf_tables_rule_notify(&trans->ctx,
8833 nft_trans_rule(trans),
8835 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
8836 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
8838 nft_trans_destroy(trans);
8840 case NFT_MSG_DELRULE:
8841 list_del_rcu(&nft_trans_rule(trans)->list);
8842 nf_tables_rule_notify(&trans->ctx,
8843 nft_trans_rule(trans),
8845 nft_rule_expr_deactivate(&trans->ctx,
8846 nft_trans_rule(trans),
8849 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
8850 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
8852 case NFT_MSG_NEWSET:
8853 if (nft_trans_set_update(trans)) {
8854 struct nft_set *set = nft_trans_set(trans);
8856 WRITE_ONCE(set->timeout, nft_trans_set_timeout(trans));
8857 WRITE_ONCE(set->gc_int, nft_trans_set_gc_int(trans));
8859 nft_clear(net, nft_trans_set(trans));
8860 /* This avoids hitting -EBUSY when deleting the table
8861 * from the transaction.
8863 if (nft_set_is_anonymous(nft_trans_set(trans)) &&
8864 !list_empty(&nft_trans_set(trans)->bindings))
8865 trans->ctx.table->use--;
8867 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
8868 NFT_MSG_NEWSET, GFP_KERNEL);
8869 nft_trans_destroy(trans);
8871 case NFT_MSG_DELSET:
8872 list_del_rcu(&nft_trans_set(trans)->list);
8873 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
8874 NFT_MSG_DELSET, GFP_KERNEL);
8876 case NFT_MSG_NEWSETELEM:
8877 te = (struct nft_trans_elem *)trans->data;
8879 nft_setelem_activate(net, te->set, &te->elem);
8880 nf_tables_setelem_notify(&trans->ctx, te->set,
8882 NFT_MSG_NEWSETELEM);
8883 nft_trans_destroy(trans);
8885 case NFT_MSG_DELSETELEM:
8886 te = (struct nft_trans_elem *)trans->data;
8888 nf_tables_setelem_notify(&trans->ctx, te->set,
8890 NFT_MSG_DELSETELEM);
8891 nft_setelem_remove(net, te->set, &te->elem);
8892 if (!nft_setelem_is_catchall(te->set, &te->elem)) {
8893 atomic_dec(&te->set->nelems);
8897 case NFT_MSG_NEWOBJ:
8898 if (nft_trans_obj_update(trans)) {
8899 nft_obj_commit_update(trans);
8900 nf_tables_obj_notify(&trans->ctx,
8901 nft_trans_obj(trans),
8904 nft_clear(net, nft_trans_obj(trans));
8905 nf_tables_obj_notify(&trans->ctx,
8906 nft_trans_obj(trans),
8908 nft_trans_destroy(trans);
8911 case NFT_MSG_DELOBJ:
8912 nft_obj_del(nft_trans_obj(trans));
8913 nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
8916 case NFT_MSG_NEWFLOWTABLE:
8917 if (nft_trans_flowtable_update(trans)) {
8918 nft_trans_flowtable(trans)->data.flags =
8919 nft_trans_flowtable_flags(trans);
8920 nf_tables_flowtable_notify(&trans->ctx,
8921 nft_trans_flowtable(trans),
8922 &nft_trans_flowtable_hooks(trans),
8923 NFT_MSG_NEWFLOWTABLE);
8924 list_splice(&nft_trans_flowtable_hooks(trans),
8925 &nft_trans_flowtable(trans)->hook_list);
8927 nft_clear(net, nft_trans_flowtable(trans));
8928 nf_tables_flowtable_notify(&trans->ctx,
8929 nft_trans_flowtable(trans),
8930 &nft_trans_flowtable(trans)->hook_list,
8931 NFT_MSG_NEWFLOWTABLE);
8933 nft_trans_destroy(trans);
8935 case NFT_MSG_DELFLOWTABLE:
8936 if (nft_trans_flowtable_update(trans)) {
8937 nf_tables_flowtable_notify(&trans->ctx,
8938 nft_trans_flowtable(trans),
8939 &nft_trans_flowtable_hooks(trans),
8940 NFT_MSG_DELFLOWTABLE);
8941 nft_unregister_flowtable_net_hooks(net,
8942 &nft_trans_flowtable_hooks(trans));
8944 list_del_rcu(&nft_trans_flowtable(trans)->list);
8945 nf_tables_flowtable_notify(&trans->ctx,
8946 nft_trans_flowtable(trans),
8947 &nft_trans_flowtable(trans)->hook_list,
8948 NFT_MSG_DELFLOWTABLE);
8949 nft_unregister_flowtable_net_hooks(net,
8950 &nft_trans_flowtable(trans)->hook_list);
8956 nft_commit_notify(net, NETLINK_CB(skb).portid);
8957 nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
8958 nf_tables_commit_audit_log(&adl, nft_net->base_seq);
8959 nf_tables_commit_release(net);
8964 static void nf_tables_module_autoload(struct net *net)
8966 struct nftables_pernet *nft_net = nft_pernet(net);
8967 struct nft_module_request *req, *next;
8968 LIST_HEAD(module_list);
8970 list_splice_init(&nft_net->module_list, &module_list);
8971 mutex_unlock(&nft_net->commit_mutex);
8972 list_for_each_entry_safe(req, next, &module_list, list) {
8973 request_module("%s", req->module);
8976 mutex_lock(&nft_net->commit_mutex);
8977 list_splice(&module_list, &nft_net->module_list);
8980 static void nf_tables_abort_release(struct nft_trans *trans)
8982 switch (trans->msg_type) {
8983 case NFT_MSG_NEWTABLE:
8984 nf_tables_table_destroy(&trans->ctx);
8986 case NFT_MSG_NEWCHAIN:
8987 nf_tables_chain_destroy(&trans->ctx);
8989 case NFT_MSG_NEWRULE:
8990 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
8992 case NFT_MSG_NEWSET:
8993 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
8995 case NFT_MSG_NEWSETELEM:
8996 nft_set_elem_destroy(nft_trans_elem_set(trans),
8997 nft_trans_elem(trans).priv, true);
8999 case NFT_MSG_NEWOBJ:
9000 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
9002 case NFT_MSG_NEWFLOWTABLE:
9003 if (nft_trans_flowtable_update(trans))
9004 nft_flowtable_hooks_destroy(&nft_trans_flowtable_hooks(trans));
9006 nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
9012 static int __nf_tables_abort(struct net *net, enum nfnl_abort_action action)
9014 struct nftables_pernet *nft_net = nft_pernet(net);
9015 struct nft_trans *trans, *next;
9016 struct nft_trans_elem *te;
9018 if (action == NFNL_ABORT_VALIDATE &&
9019 nf_tables_validate(net) < 0)
9022 list_for_each_entry_safe_reverse(trans, next, &nft_net->commit_list,
9024 switch (trans->msg_type) {
9025 case NFT_MSG_NEWTABLE:
9026 if (nft_trans_table_update(trans)) {
9027 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
9028 nft_trans_destroy(trans);
9031 if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_DORMANT) {
9032 nf_tables_table_disable(net, trans->ctx.table);
9033 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
9034 } else if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_AWAKEN) {
9035 trans->ctx.table->flags &= ~NFT_TABLE_F_DORMANT;
9037 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
9038 nft_trans_destroy(trans);
9040 list_del_rcu(&trans->ctx.table->list);
9043 case NFT_MSG_DELTABLE:
9044 nft_clear(trans->ctx.net, trans->ctx.table);
9045 nft_trans_destroy(trans);
9047 case NFT_MSG_NEWCHAIN:
9048 if (nft_trans_chain_update(trans)) {
9049 free_percpu(nft_trans_chain_stats(trans));
9050 kfree(nft_trans_chain_name(trans));
9051 nft_trans_destroy(trans);
9053 if (nft_chain_is_bound(trans->ctx.chain)) {
9054 nft_trans_destroy(trans);
9057 trans->ctx.table->use--;
9058 nft_chain_del(trans->ctx.chain);
9059 nf_tables_unregister_hook(trans->ctx.net,
9064 case NFT_MSG_DELCHAIN:
9065 trans->ctx.table->use++;
9066 nft_clear(trans->ctx.net, trans->ctx.chain);
9067 nft_trans_destroy(trans);
9069 case NFT_MSG_NEWRULE:
9070 trans->ctx.chain->use--;
9071 list_del_rcu(&nft_trans_rule(trans)->list);
9072 nft_rule_expr_deactivate(&trans->ctx,
9073 nft_trans_rule(trans),
9075 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
9076 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
9078 case NFT_MSG_DELRULE:
9079 trans->ctx.chain->use++;
9080 nft_clear(trans->ctx.net, nft_trans_rule(trans));
9081 nft_rule_expr_activate(&trans->ctx, nft_trans_rule(trans));
9082 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
9083 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
9085 nft_trans_destroy(trans);
9087 case NFT_MSG_NEWSET:
9088 if (nft_trans_set_update(trans)) {
9089 nft_trans_destroy(trans);
9092 trans->ctx.table->use--;
9093 if (nft_trans_set_bound(trans)) {
9094 nft_trans_destroy(trans);
9097 list_del_rcu(&nft_trans_set(trans)->list);
9099 case NFT_MSG_DELSET:
9100 trans->ctx.table->use++;
9101 nft_clear(trans->ctx.net, nft_trans_set(trans));
9102 nft_trans_destroy(trans);
9104 case NFT_MSG_NEWSETELEM:
9105 if (nft_trans_elem_set_bound(trans)) {
9106 nft_trans_destroy(trans);
9109 te = (struct nft_trans_elem *)trans->data;
9110 nft_setelem_remove(net, te->set, &te->elem);
9111 if (!nft_setelem_is_catchall(te->set, &te->elem))
9112 atomic_dec(&te->set->nelems);
9114 case NFT_MSG_DELSETELEM:
9115 te = (struct nft_trans_elem *)trans->data;
9117 nft_setelem_data_activate(net, te->set, &te->elem);
9118 nft_setelem_activate(net, te->set, &te->elem);
9119 if (!nft_setelem_is_catchall(te->set, &te->elem))
9122 nft_trans_destroy(trans);
9124 case NFT_MSG_NEWOBJ:
9125 if (nft_trans_obj_update(trans)) {
9126 nft_obj_destroy(&trans->ctx, nft_trans_obj_newobj(trans));
9127 nft_trans_destroy(trans);
9129 trans->ctx.table->use--;
9130 nft_obj_del(nft_trans_obj(trans));
9133 case NFT_MSG_DELOBJ:
9134 trans->ctx.table->use++;
9135 nft_clear(trans->ctx.net, nft_trans_obj(trans));
9136 nft_trans_destroy(trans);
9138 case NFT_MSG_NEWFLOWTABLE:
9139 if (nft_trans_flowtable_update(trans)) {
9140 nft_unregister_flowtable_net_hooks(net,
9141 &nft_trans_flowtable_hooks(trans));
9143 trans->ctx.table->use--;
9144 list_del_rcu(&nft_trans_flowtable(trans)->list);
9145 nft_unregister_flowtable_net_hooks(net,
9146 &nft_trans_flowtable(trans)->hook_list);
9149 case NFT_MSG_DELFLOWTABLE:
9150 if (nft_trans_flowtable_update(trans)) {
9151 list_splice(&nft_trans_flowtable_hooks(trans),
9152 &nft_trans_flowtable(trans)->hook_list);
9154 trans->ctx.table->use++;
9155 nft_clear(trans->ctx.net, nft_trans_flowtable(trans));
9157 nft_trans_destroy(trans);
9164 list_for_each_entry_safe_reverse(trans, next,
9165 &nft_net->commit_list, list) {
9166 list_del(&trans->list);
9167 nf_tables_abort_release(trans);
9170 if (action == NFNL_ABORT_AUTOLOAD)
9171 nf_tables_module_autoload(net);
9173 nf_tables_module_autoload_cleanup(net);
9178 static void nf_tables_cleanup(struct net *net)
9180 nft_validate_state_update(net, NFT_VALIDATE_SKIP);
9183 static int nf_tables_abort(struct net *net, struct sk_buff *skb,
9184 enum nfnl_abort_action action)
9186 struct nftables_pernet *nft_net = nft_pernet(net);
9187 int ret = __nf_tables_abort(net, action);
9189 mutex_unlock(&nft_net->commit_mutex);
9194 static bool nf_tables_valid_genid(struct net *net, u32 genid)
9196 struct nftables_pernet *nft_net = nft_pernet(net);
9199 mutex_lock(&nft_net->commit_mutex);
9201 genid_ok = genid == 0 || nft_net->base_seq == genid;
9203 mutex_unlock(&nft_net->commit_mutex);
9205 /* else, commit mutex has to be released by commit or abort function */
9209 static const struct nfnetlink_subsystem nf_tables_subsys = {
9210 .name = "nf_tables",
9211 .subsys_id = NFNL_SUBSYS_NFTABLES,
9212 .cb_count = NFT_MSG_MAX,
9214 .commit = nf_tables_commit,
9215 .abort = nf_tables_abort,
9216 .cleanup = nf_tables_cleanup,
9217 .valid_genid = nf_tables_valid_genid,
9218 .owner = THIS_MODULE,
9221 int nft_chain_validate_dependency(const struct nft_chain *chain,
9222 enum nft_chain_types type)
9224 const struct nft_base_chain *basechain;
9226 if (nft_is_base_chain(chain)) {
9227 basechain = nft_base_chain(chain);
9228 if (basechain->type->type != type)
9233 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
9235 int nft_chain_validate_hooks(const struct nft_chain *chain,
9236 unsigned int hook_flags)
9238 struct nft_base_chain *basechain;
9240 if (nft_is_base_chain(chain)) {
9241 basechain = nft_base_chain(chain);
9243 if ((1 << basechain->ops.hooknum) & hook_flags)
9251 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
9254 * Loop detection - walk through the ruleset beginning at the destination chain
9255 * of a new jump until either the source chain is reached (loop) or all
9256 * reachable chains have been traversed.
9258 * The loop check is performed whenever a new jump verdict is added to an
9259 * expression or verdict map or a verdict map is bound to a new chain.
9262 static int nf_tables_check_loops(const struct nft_ctx *ctx,
9263 const struct nft_chain *chain);
9265 static int nft_check_loops(const struct nft_ctx *ctx,
9266 const struct nft_set_ext *ext)
9268 const struct nft_data *data;
9271 data = nft_set_ext_data(ext);
9272 switch (data->verdict.code) {
9275 ret = nf_tables_check_loops(ctx, data->verdict.chain);
9285 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
9286 struct nft_set *set,
9287 const struct nft_set_iter *iter,
9288 struct nft_set_elem *elem)
9290 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
9292 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
9293 *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
9296 return nft_check_loops(ctx, ext);
9299 static int nft_set_catchall_loops(const struct nft_ctx *ctx,
9300 struct nft_set *set)
9302 u8 genmask = nft_genmask_next(ctx->net);
9303 struct nft_set_elem_catchall *catchall;
9304 struct nft_set_ext *ext;
9307 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
9308 ext = nft_set_elem_ext(set, catchall->elem);
9309 if (!nft_set_elem_active(ext, genmask))
9312 ret = nft_check_loops(ctx, ext);
9320 static int nf_tables_check_loops(const struct nft_ctx *ctx,
9321 const struct nft_chain *chain)
9323 const struct nft_rule *rule;
9324 const struct nft_expr *expr, *last;
9325 struct nft_set *set;
9326 struct nft_set_binding *binding;
9327 struct nft_set_iter iter;
9329 if (ctx->chain == chain)
9332 list_for_each_entry(rule, &chain->rules, list) {
9333 nft_rule_for_each_expr(expr, last, rule) {
9334 struct nft_immediate_expr *priv;
9335 const struct nft_data *data;
9338 if (strcmp(expr->ops->type->name, "immediate"))
9341 priv = nft_expr_priv(expr);
9342 if (priv->dreg != NFT_REG_VERDICT)
9346 switch (data->verdict.code) {
9349 err = nf_tables_check_loops(ctx,
9350 data->verdict.chain);
9360 list_for_each_entry(set, &ctx->table->sets, list) {
9361 if (!nft_is_active_next(ctx->net, set))
9363 if (!(set->flags & NFT_SET_MAP) ||
9364 set->dtype != NFT_DATA_VERDICT)
9367 list_for_each_entry(binding, &set->bindings, list) {
9368 if (!(binding->flags & NFT_SET_MAP) ||
9369 binding->chain != chain)
9372 iter.genmask = nft_genmask_next(ctx->net);
9376 iter.fn = nf_tables_loop_check_setelem;
9378 set->ops->walk(ctx, set, &iter);
9380 iter.err = nft_set_catchall_loops(ctx, set);
9391 * nft_parse_u32_check - fetch u32 attribute and check for maximum value
9393 * @attr: netlink attribute to fetch value from
9394 * @max: maximum value to be stored in dest
9395 * @dest: pointer to the variable
9397 * Parse, check and store a given u32 netlink attribute into variable.
9398 * This function returns -ERANGE if the value goes over maximum value.
9399 * Otherwise a 0 is returned and the attribute value is stored in the
9400 * destination variable.
9402 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
9406 val = ntohl(nla_get_be32(attr));
9413 EXPORT_SYMBOL_GPL(nft_parse_u32_check);
9415 static int nft_parse_register(const struct nlattr *attr, u32 *preg)
9419 reg = ntohl(nla_get_be32(attr));
9421 case NFT_REG_VERDICT...NFT_REG_4:
9422 *preg = reg * NFT_REG_SIZE / NFT_REG32_SIZE;
9424 case NFT_REG32_00...NFT_REG32_15:
9425 *preg = reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
9435 * nft_dump_register - dump a register value to a netlink attribute
9437 * @skb: socket buffer
9438 * @attr: attribute number
9439 * @reg: register number
9441 * Construct a netlink attribute containing the register number. For
9442 * compatibility reasons, register numbers being a multiple of 4 are
9443 * translated to the corresponding 128 bit register numbers.
9445 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
9447 if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
9448 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
9450 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
9452 return nla_put_be32(skb, attr, htonl(reg));
9454 EXPORT_SYMBOL_GPL(nft_dump_register);
9456 static int nft_validate_register_load(enum nft_registers reg, unsigned int len)
9458 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
9462 if (reg * NFT_REG32_SIZE + len > sizeof_field(struct nft_regs, data))
9468 int nft_parse_register_load(const struct nlattr *attr, u8 *sreg, u32 len)
9473 err = nft_parse_register(attr, ®);
9477 err = nft_validate_register_load(reg, len);
9484 EXPORT_SYMBOL_GPL(nft_parse_register_load);
9486 static int nft_validate_register_store(const struct nft_ctx *ctx,
9487 enum nft_registers reg,
9488 const struct nft_data *data,
9489 enum nft_data_types type,
9495 case NFT_REG_VERDICT:
9496 if (type != NFT_DATA_VERDICT)
9500 (data->verdict.code == NFT_GOTO ||
9501 data->verdict.code == NFT_JUMP)) {
9502 err = nf_tables_check_loops(ctx, data->verdict.chain);
9509 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
9513 if (reg * NFT_REG32_SIZE + len >
9514 sizeof_field(struct nft_regs, data))
9517 if (data != NULL && type != NFT_DATA_VALUE)
9523 int nft_parse_register_store(const struct nft_ctx *ctx,
9524 const struct nlattr *attr, u8 *dreg,
9525 const struct nft_data *data,
9526 enum nft_data_types type, unsigned int len)
9531 err = nft_parse_register(attr, ®);
9535 err = nft_validate_register_store(ctx, reg, data, type, len);
9542 EXPORT_SYMBOL_GPL(nft_parse_register_store);
9544 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
9545 [NFTA_VERDICT_CODE] = { .type = NLA_U32 },
9546 [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING,
9547 .len = NFT_CHAIN_MAXNAMELEN - 1 },
9548 [NFTA_VERDICT_CHAIN_ID] = { .type = NLA_U32 },
9551 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
9552 struct nft_data_desc *desc, const struct nlattr *nla)
9554 u8 genmask = nft_genmask_next(ctx->net);
9555 struct nlattr *tb[NFTA_VERDICT_MAX + 1];
9556 struct nft_chain *chain;
9559 err = nla_parse_nested_deprecated(tb, NFTA_VERDICT_MAX, nla,
9560 nft_verdict_policy, NULL);
9564 if (!tb[NFTA_VERDICT_CODE])
9566 data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
9568 switch (data->verdict.code) {
9570 switch (data->verdict.code & NF_VERDICT_MASK) {
9585 if (tb[NFTA_VERDICT_CHAIN]) {
9586 chain = nft_chain_lookup(ctx->net, ctx->table,
9587 tb[NFTA_VERDICT_CHAIN],
9589 } else if (tb[NFTA_VERDICT_CHAIN_ID]) {
9590 chain = nft_chain_lookup_byid(ctx->net, ctx->table,
9591 tb[NFTA_VERDICT_CHAIN_ID]);
9593 return PTR_ERR(chain);
9599 return PTR_ERR(chain);
9600 if (nft_is_base_chain(chain))
9602 if (nft_chain_is_bound(chain))
9604 if (desc->flags & NFT_DATA_DESC_SETELEM &&
9605 chain->flags & NFT_CHAIN_BINDING)
9609 data->verdict.chain = chain;
9613 desc->len = sizeof(data->verdict);
9618 static void nft_verdict_uninit(const struct nft_data *data)
9620 struct nft_chain *chain;
9621 struct nft_rule *rule;
9623 switch (data->verdict.code) {
9626 chain = data->verdict.chain;
9629 if (!nft_chain_is_bound(chain))
9632 chain->table->use--;
9633 list_for_each_entry(rule, &chain->rules, list)
9636 nft_chain_del(chain);
9641 int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
9643 struct nlattr *nest;
9645 nest = nla_nest_start_noflag(skb, type);
9647 goto nla_put_failure;
9649 if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
9650 goto nla_put_failure;
9655 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
9657 goto nla_put_failure;
9659 nla_nest_end(skb, nest);
9666 static int nft_value_init(const struct nft_ctx *ctx,
9667 struct nft_data *data, struct nft_data_desc *desc,
9668 const struct nlattr *nla)
9675 if (len > desc->size)
9678 if (len != desc->len)
9684 nla_memcpy(data->data, nla, len);
9689 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
9692 return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
9695 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
9696 [NFTA_DATA_VALUE] = { .type = NLA_BINARY },
9697 [NFTA_DATA_VERDICT] = { .type = NLA_NESTED },
9701 * nft_data_init - parse nf_tables data netlink attributes
9703 * @ctx: context of the expression using the data
9704 * @data: destination struct nft_data
9705 * @desc: data description
9706 * @nla: netlink attribute containing data
9708 * Parse the netlink data attributes and initialize a struct nft_data.
9709 * The type and length of data are returned in the data description.
9711 * The caller can indicate that it only wants to accept data of type
9712 * NFT_DATA_VALUE by passing NULL for the ctx argument.
9714 int nft_data_init(const struct nft_ctx *ctx, struct nft_data *data,
9715 struct nft_data_desc *desc, const struct nlattr *nla)
9717 struct nlattr *tb[NFTA_DATA_MAX + 1];
9720 if (WARN_ON_ONCE(!desc->size))
9723 err = nla_parse_nested_deprecated(tb, NFTA_DATA_MAX, nla,
9724 nft_data_policy, NULL);
9728 if (tb[NFTA_DATA_VALUE]) {
9729 if (desc->type != NFT_DATA_VALUE)
9732 err = nft_value_init(ctx, data, desc, tb[NFTA_DATA_VALUE]);
9733 } else if (tb[NFTA_DATA_VERDICT] && ctx != NULL) {
9734 if (desc->type != NFT_DATA_VERDICT)
9737 err = nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
9744 EXPORT_SYMBOL_GPL(nft_data_init);
9747 * nft_data_release - release a nft_data item
9749 * @data: struct nft_data to release
9750 * @type: type of data
9752 * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
9753 * all others need to be released by calling this function.
9755 void nft_data_release(const struct nft_data *data, enum nft_data_types type)
9757 if (type < NFT_DATA_VERDICT)
9760 case NFT_DATA_VERDICT:
9761 return nft_verdict_uninit(data);
9766 EXPORT_SYMBOL_GPL(nft_data_release);
9768 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
9769 enum nft_data_types type, unsigned int len)
9771 struct nlattr *nest;
9774 nest = nla_nest_start_noflag(skb, attr);
9779 case NFT_DATA_VALUE:
9780 err = nft_value_dump(skb, data, len);
9782 case NFT_DATA_VERDICT:
9783 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
9790 nla_nest_end(skb, nest);
9793 EXPORT_SYMBOL_GPL(nft_data_dump);
9795 int __nft_release_basechain(struct nft_ctx *ctx)
9797 struct nft_rule *rule, *nr;
9799 if (WARN_ON(!nft_is_base_chain(ctx->chain)))
9802 nf_tables_unregister_hook(ctx->net, ctx->chain->table, ctx->chain);
9803 list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
9804 list_del(&rule->list);
9806 nf_tables_rule_release(ctx, rule);
9808 nft_chain_del(ctx->chain);
9810 nf_tables_chain_destroy(ctx);
9814 EXPORT_SYMBOL_GPL(__nft_release_basechain);
9816 static void __nft_release_hook(struct net *net, struct nft_table *table)
9818 struct nft_flowtable *flowtable;
9819 struct nft_chain *chain;
9821 list_for_each_entry(chain, &table->chains, list)
9822 __nf_tables_unregister_hook(net, table, chain, true);
9823 list_for_each_entry(flowtable, &table->flowtables, list)
9824 __nft_unregister_flowtable_net_hooks(net, &flowtable->hook_list,
9828 static void __nft_release_hooks(struct net *net)
9830 struct nftables_pernet *nft_net = nft_pernet(net);
9831 struct nft_table *table;
9833 list_for_each_entry(table, &nft_net->tables, list) {
9834 if (nft_table_has_owner(table))
9837 __nft_release_hook(net, table);
9841 static void __nft_release_table(struct net *net, struct nft_table *table)
9843 struct nft_flowtable *flowtable, *nf;
9844 struct nft_chain *chain, *nc;
9845 struct nft_object *obj, *ne;
9846 struct nft_rule *rule, *nr;
9847 struct nft_set *set, *ns;
9848 struct nft_ctx ctx = {
9850 .family = NFPROTO_NETDEV,
9853 ctx.family = table->family;
9855 list_for_each_entry(chain, &table->chains, list) {
9857 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
9858 list_del(&rule->list);
9860 nf_tables_rule_release(&ctx, rule);
9863 list_for_each_entry_safe(flowtable, nf, &table->flowtables, list) {
9864 list_del(&flowtable->list);
9866 nf_tables_flowtable_destroy(flowtable);
9868 list_for_each_entry_safe(set, ns, &table->sets, list) {
9869 list_del(&set->list);
9871 nft_set_destroy(&ctx, set);
9873 list_for_each_entry_safe(obj, ne, &table->objects, list) {
9876 nft_obj_destroy(&ctx, obj);
9878 list_for_each_entry_safe(chain, nc, &table->chains, list) {
9880 nft_chain_del(chain);
9882 nf_tables_chain_destroy(&ctx);
9884 nf_tables_table_destroy(&ctx);
9887 static void __nft_release_tables(struct net *net)
9889 struct nftables_pernet *nft_net = nft_pernet(net);
9890 struct nft_table *table, *nt;
9892 list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
9893 if (nft_table_has_owner(table))
9896 list_del(&table->list);
9898 __nft_release_table(net, table);
9902 static int nft_rcv_nl_event(struct notifier_block *this, unsigned long event,
9905 struct nft_table *table, *to_delete[8];
9906 struct nftables_pernet *nft_net;
9907 struct netlink_notify *n = ptr;
9908 struct net *net = n->net;
9909 unsigned int deleted;
9910 bool restart = false;
9912 if (event != NETLINK_URELEASE || n->protocol != NETLINK_NETFILTER)
9915 nft_net = nft_pernet(net);
9917 mutex_lock(&nft_net->commit_mutex);
9918 if (!list_empty(&nf_tables_destroy_list))
9921 list_for_each_entry(table, &nft_net->tables, list) {
9922 if (nft_table_has_owner(table) &&
9923 n->portid == table->nlpid) {
9924 __nft_release_hook(net, table);
9925 list_del_rcu(&table->list);
9926 to_delete[deleted++] = table;
9927 if (deleted >= ARRAY_SIZE(to_delete))
9932 restart = deleted >= ARRAY_SIZE(to_delete);
9935 __nft_release_table(net, to_delete[--deleted]);
9940 mutex_unlock(&nft_net->commit_mutex);
9945 static struct notifier_block nft_nl_notifier = {
9946 .notifier_call = nft_rcv_nl_event,
9949 static int __net_init nf_tables_init_net(struct net *net)
9951 struct nftables_pernet *nft_net = nft_pernet(net);
9953 INIT_LIST_HEAD(&nft_net->tables);
9954 INIT_LIST_HEAD(&nft_net->commit_list);
9955 INIT_LIST_HEAD(&nft_net->module_list);
9956 INIT_LIST_HEAD(&nft_net->notify_list);
9957 mutex_init(&nft_net->commit_mutex);
9958 nft_net->base_seq = 1;
9959 nft_net->validate_state = NFT_VALIDATE_SKIP;
9964 static void __net_exit nf_tables_pre_exit_net(struct net *net)
9966 struct nftables_pernet *nft_net = nft_pernet(net);
9968 mutex_lock(&nft_net->commit_mutex);
9969 __nft_release_hooks(net);
9970 mutex_unlock(&nft_net->commit_mutex);
9973 static void __net_exit nf_tables_exit_net(struct net *net)
9975 struct nftables_pernet *nft_net = nft_pernet(net);
9977 mutex_lock(&nft_net->commit_mutex);
9978 if (!list_empty(&nft_net->commit_list) ||
9979 !list_empty(&nft_net->module_list))
9980 __nf_tables_abort(net, NFNL_ABORT_NONE);
9981 __nft_release_tables(net);
9982 mutex_unlock(&nft_net->commit_mutex);
9983 WARN_ON_ONCE(!list_empty(&nft_net->tables));
9984 WARN_ON_ONCE(!list_empty(&nft_net->module_list));
9985 WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
9988 static struct pernet_operations nf_tables_net_ops = {
9989 .init = nf_tables_init_net,
9990 .pre_exit = nf_tables_pre_exit_net,
9991 .exit = nf_tables_exit_net,
9992 .id = &nf_tables_net_id,
9993 .size = sizeof(struct nftables_pernet),
9996 static int __init nf_tables_module_init(void)
10000 err = register_pernet_subsys(&nf_tables_net_ops);
10004 err = nft_chain_filter_init();
10006 goto err_chain_filter;
10008 err = nf_tables_core_module_init();
10010 goto err_core_module;
10012 err = register_netdevice_notifier(&nf_tables_flowtable_notifier);
10014 goto err_netdev_notifier;
10016 err = rhltable_init(&nft_objname_ht, &nft_objname_ht_params);
10018 goto err_rht_objname;
10020 err = nft_offload_init();
10024 err = netlink_register_notifier(&nft_nl_notifier);
10026 goto err_netlink_notifier;
10029 err = nfnetlink_subsys_register(&nf_tables_subsys);
10031 goto err_nfnl_subsys;
10033 nft_chain_route_init();
10038 netlink_unregister_notifier(&nft_nl_notifier);
10039 err_netlink_notifier:
10040 nft_offload_exit();
10042 rhltable_destroy(&nft_objname_ht);
10044 unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
10045 err_netdev_notifier:
10046 nf_tables_core_module_exit();
10048 nft_chain_filter_fini();
10050 unregister_pernet_subsys(&nf_tables_net_ops);
10054 static void __exit nf_tables_module_exit(void)
10056 nfnetlink_subsys_unregister(&nf_tables_subsys);
10057 netlink_unregister_notifier(&nft_nl_notifier);
10058 nft_offload_exit();
10059 unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
10060 nft_chain_filter_fini();
10061 nft_chain_route_fini();
10062 unregister_pernet_subsys(&nf_tables_net_ops);
10063 cancel_work_sync(&trans_destroy_work);
10065 rhltable_destroy(&nft_objname_ht);
10066 nf_tables_core_module_exit();
10069 module_init(nf_tables_module_init);
10070 module_exit(nf_tables_module_exit);
10072 MODULE_LICENSE("GPL");
10073 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
10074 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);