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-"))
27 #define NFT_SET_MAX_ANONLEN 16
29 unsigned int nf_tables_net_id __read_mostly;
31 static LIST_HEAD(nf_tables_expressions);
32 static LIST_HEAD(nf_tables_objects);
33 static LIST_HEAD(nf_tables_flowtables);
34 static LIST_HEAD(nf_tables_destroy_list);
35 static LIST_HEAD(nf_tables_gc_list);
36 static DEFINE_SPINLOCK(nf_tables_destroy_list_lock);
37 static DEFINE_SPINLOCK(nf_tables_gc_list_lock);
40 NFT_VALIDATE_SKIP = 0,
45 static struct rhltable nft_objname_ht;
47 static u32 nft_chain_hash(const void *data, u32 len, u32 seed);
48 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed);
49 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *, const void *);
51 static u32 nft_objname_hash(const void *data, u32 len, u32 seed);
52 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed);
53 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *, const void *);
55 static const struct rhashtable_params nft_chain_ht_params = {
56 .head_offset = offsetof(struct nft_chain, rhlhead),
57 .key_offset = offsetof(struct nft_chain, name),
58 .hashfn = nft_chain_hash,
59 .obj_hashfn = nft_chain_hash_obj,
60 .obj_cmpfn = nft_chain_hash_cmp,
61 .automatic_shrinking = true,
64 static const struct rhashtable_params nft_objname_ht_params = {
65 .head_offset = offsetof(struct nft_object, rhlhead),
66 .key_offset = offsetof(struct nft_object, key),
67 .hashfn = nft_objname_hash,
68 .obj_hashfn = nft_objname_hash_obj,
69 .obj_cmpfn = nft_objname_hash_cmp,
70 .automatic_shrinking = true,
73 struct nft_audit_data {
74 struct nft_table *table;
77 struct list_head list;
80 static const u8 nft2audit_op[NFT_MSG_MAX] = { // enum nf_tables_msg_types
81 [NFT_MSG_NEWTABLE] = AUDIT_NFT_OP_TABLE_REGISTER,
82 [NFT_MSG_GETTABLE] = AUDIT_NFT_OP_INVALID,
83 [NFT_MSG_DELTABLE] = AUDIT_NFT_OP_TABLE_UNREGISTER,
84 [NFT_MSG_NEWCHAIN] = AUDIT_NFT_OP_CHAIN_REGISTER,
85 [NFT_MSG_GETCHAIN] = AUDIT_NFT_OP_INVALID,
86 [NFT_MSG_DELCHAIN] = AUDIT_NFT_OP_CHAIN_UNREGISTER,
87 [NFT_MSG_NEWRULE] = AUDIT_NFT_OP_RULE_REGISTER,
88 [NFT_MSG_GETRULE] = AUDIT_NFT_OP_INVALID,
89 [NFT_MSG_DELRULE] = AUDIT_NFT_OP_RULE_UNREGISTER,
90 [NFT_MSG_NEWSET] = AUDIT_NFT_OP_SET_REGISTER,
91 [NFT_MSG_GETSET] = AUDIT_NFT_OP_INVALID,
92 [NFT_MSG_DELSET] = AUDIT_NFT_OP_SET_UNREGISTER,
93 [NFT_MSG_NEWSETELEM] = AUDIT_NFT_OP_SETELEM_REGISTER,
94 [NFT_MSG_GETSETELEM] = AUDIT_NFT_OP_INVALID,
95 [NFT_MSG_DELSETELEM] = AUDIT_NFT_OP_SETELEM_UNREGISTER,
96 [NFT_MSG_NEWGEN] = AUDIT_NFT_OP_GEN_REGISTER,
97 [NFT_MSG_GETGEN] = AUDIT_NFT_OP_INVALID,
98 [NFT_MSG_TRACE] = AUDIT_NFT_OP_INVALID,
99 [NFT_MSG_NEWOBJ] = AUDIT_NFT_OP_OBJ_REGISTER,
100 [NFT_MSG_GETOBJ] = AUDIT_NFT_OP_INVALID,
101 [NFT_MSG_DELOBJ] = AUDIT_NFT_OP_OBJ_UNREGISTER,
102 [NFT_MSG_GETOBJ_RESET] = AUDIT_NFT_OP_OBJ_RESET,
103 [NFT_MSG_NEWFLOWTABLE] = AUDIT_NFT_OP_FLOWTABLE_REGISTER,
104 [NFT_MSG_GETFLOWTABLE] = AUDIT_NFT_OP_INVALID,
105 [NFT_MSG_DELFLOWTABLE] = AUDIT_NFT_OP_FLOWTABLE_UNREGISTER,
106 [NFT_MSG_GETSETELEM_RESET] = AUDIT_NFT_OP_SETELEM_RESET,
109 static void nft_validate_state_update(struct nft_table *table, u8 new_validate_state)
111 switch (table->validate_state) {
112 case NFT_VALIDATE_SKIP:
113 WARN_ON_ONCE(new_validate_state == NFT_VALIDATE_DO);
115 case NFT_VALIDATE_NEED:
117 case NFT_VALIDATE_DO:
118 if (new_validate_state == NFT_VALIDATE_NEED)
122 table->validate_state = new_validate_state;
124 static void nf_tables_trans_destroy_work(struct work_struct *w);
125 static DECLARE_WORK(trans_destroy_work, nf_tables_trans_destroy_work);
127 static void nft_trans_gc_work(struct work_struct *work);
128 static DECLARE_WORK(trans_gc_work, nft_trans_gc_work);
130 static void nft_ctx_init(struct nft_ctx *ctx,
132 const struct sk_buff *skb,
133 const struct nlmsghdr *nlh,
135 struct nft_table *table,
136 struct nft_chain *chain,
137 const struct nlattr * const *nla)
140 ctx->family = family;
145 ctx->portid = NETLINK_CB(skb).portid;
146 ctx->report = nlmsg_report(nlh);
147 ctx->flags = nlh->nlmsg_flags;
148 ctx->seq = nlh->nlmsg_seq;
151 static struct nft_trans *nft_trans_alloc_gfp(const struct nft_ctx *ctx,
152 int msg_type, u32 size, gfp_t gfp)
154 struct nft_trans *trans;
156 trans = kzalloc(sizeof(struct nft_trans) + size, gfp);
160 INIT_LIST_HEAD(&trans->list);
161 INIT_LIST_HEAD(&trans->binding_list);
162 trans->msg_type = msg_type;
168 static struct nft_trans *nft_trans_alloc(const struct nft_ctx *ctx,
169 int msg_type, u32 size)
171 return nft_trans_alloc_gfp(ctx, msg_type, size, GFP_KERNEL);
174 static void nft_trans_list_del(struct nft_trans *trans)
176 list_del(&trans->list);
177 list_del(&trans->binding_list);
180 static void nft_trans_destroy(struct nft_trans *trans)
182 nft_trans_list_del(trans);
186 static void __nft_set_trans_bind(const struct nft_ctx *ctx, struct nft_set *set,
189 struct nftables_pernet *nft_net;
190 struct net *net = ctx->net;
191 struct nft_trans *trans;
193 if (!nft_set_is_anonymous(set))
196 nft_net = nft_pernet(net);
197 list_for_each_entry_reverse(trans, &nft_net->commit_list, list) {
198 switch (trans->msg_type) {
200 if (nft_trans_set(trans) == set)
201 nft_trans_set_bound(trans) = bind;
203 case NFT_MSG_NEWSETELEM:
204 if (nft_trans_elem_set(trans) == set)
205 nft_trans_elem_set_bound(trans) = bind;
211 static void nft_set_trans_bind(const struct nft_ctx *ctx, struct nft_set *set)
213 return __nft_set_trans_bind(ctx, set, true);
216 static void nft_set_trans_unbind(const struct nft_ctx *ctx, struct nft_set *set)
218 return __nft_set_trans_bind(ctx, set, false);
221 static void __nft_chain_trans_bind(const struct nft_ctx *ctx,
222 struct nft_chain *chain, bool bind)
224 struct nftables_pernet *nft_net;
225 struct net *net = ctx->net;
226 struct nft_trans *trans;
228 if (!nft_chain_binding(chain))
231 nft_net = nft_pernet(net);
232 list_for_each_entry_reverse(trans, &nft_net->commit_list, list) {
233 switch (trans->msg_type) {
234 case NFT_MSG_NEWCHAIN:
235 if (nft_trans_chain(trans) == chain)
236 nft_trans_chain_bound(trans) = bind;
238 case NFT_MSG_NEWRULE:
239 if (trans->ctx.chain == chain)
240 nft_trans_rule_bound(trans) = bind;
246 static void nft_chain_trans_bind(const struct nft_ctx *ctx,
247 struct nft_chain *chain)
249 __nft_chain_trans_bind(ctx, chain, true);
252 int nf_tables_bind_chain(const struct nft_ctx *ctx, struct nft_chain *chain)
254 if (!nft_chain_binding(chain))
257 if (nft_chain_binding(ctx->chain))
263 if (!nft_use_inc(&chain->use))
267 nft_chain_trans_bind(ctx, chain);
272 void nf_tables_unbind_chain(const struct nft_ctx *ctx, struct nft_chain *chain)
274 __nft_chain_trans_bind(ctx, chain, false);
277 static int nft_netdev_register_hooks(struct net *net,
278 struct list_head *hook_list)
280 struct nft_hook *hook;
284 list_for_each_entry(hook, hook_list, list) {
285 err = nf_register_net_hook(net, &hook->ops);
294 list_for_each_entry(hook, hook_list, list) {
298 nf_unregister_net_hook(net, &hook->ops);
303 static void nft_netdev_unregister_hooks(struct net *net,
304 struct list_head *hook_list,
307 struct nft_hook *hook, *next;
309 list_for_each_entry_safe(hook, next, hook_list, list) {
310 nf_unregister_net_hook(net, &hook->ops);
311 if (release_netdev) {
312 list_del(&hook->list);
313 kfree_rcu(hook, rcu);
318 static int nf_tables_register_hook(struct net *net,
319 const struct nft_table *table,
320 struct nft_chain *chain)
322 struct nft_base_chain *basechain;
323 const struct nf_hook_ops *ops;
325 if (table->flags & NFT_TABLE_F_DORMANT ||
326 !nft_is_base_chain(chain))
329 basechain = nft_base_chain(chain);
330 ops = &basechain->ops;
332 if (basechain->type->ops_register)
333 return basechain->type->ops_register(net, ops);
335 if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
336 return nft_netdev_register_hooks(net, &basechain->hook_list);
338 return nf_register_net_hook(net, &basechain->ops);
341 static void __nf_tables_unregister_hook(struct net *net,
342 const struct nft_table *table,
343 struct nft_chain *chain,
346 struct nft_base_chain *basechain;
347 const struct nf_hook_ops *ops;
349 if (table->flags & NFT_TABLE_F_DORMANT ||
350 !nft_is_base_chain(chain))
352 basechain = nft_base_chain(chain);
353 ops = &basechain->ops;
355 if (basechain->type->ops_unregister)
356 return basechain->type->ops_unregister(net, ops);
358 if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
359 nft_netdev_unregister_hooks(net, &basechain->hook_list,
362 nf_unregister_net_hook(net, &basechain->ops);
365 static void nf_tables_unregister_hook(struct net *net,
366 const struct nft_table *table,
367 struct nft_chain *chain)
369 return __nf_tables_unregister_hook(net, table, chain, false);
372 static void nft_trans_commit_list_add_tail(struct net *net, struct nft_trans *trans)
374 struct nftables_pernet *nft_net = nft_pernet(net);
376 switch (trans->msg_type) {
378 if (!nft_trans_set_update(trans) &&
379 nft_set_is_anonymous(nft_trans_set(trans)))
380 list_add_tail(&trans->binding_list, &nft_net->binding_list);
382 case NFT_MSG_NEWCHAIN:
383 if (!nft_trans_chain_update(trans) &&
384 nft_chain_binding(nft_trans_chain(trans)))
385 list_add_tail(&trans->binding_list, &nft_net->binding_list);
389 list_add_tail(&trans->list, &nft_net->commit_list);
392 static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type)
394 struct nft_trans *trans;
396 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table));
400 if (msg_type == NFT_MSG_NEWTABLE)
401 nft_activate_next(ctx->net, ctx->table);
403 nft_trans_commit_list_add_tail(ctx->net, trans);
407 static int nft_deltable(struct nft_ctx *ctx)
411 err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE);
415 nft_deactivate_next(ctx->net, ctx->table);
419 static struct nft_trans *nft_trans_chain_add(struct nft_ctx *ctx, int msg_type)
421 struct nft_trans *trans;
423 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain));
425 return ERR_PTR(-ENOMEM);
427 if (msg_type == NFT_MSG_NEWCHAIN) {
428 nft_activate_next(ctx->net, ctx->chain);
430 if (ctx->nla[NFTA_CHAIN_ID]) {
431 nft_trans_chain_id(trans) =
432 ntohl(nla_get_be32(ctx->nla[NFTA_CHAIN_ID]));
435 nft_trans_chain(trans) = ctx->chain;
436 nft_trans_commit_list_add_tail(ctx->net, trans);
441 static int nft_delchain(struct nft_ctx *ctx)
443 struct nft_trans *trans;
445 trans = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN);
447 return PTR_ERR(trans);
449 nft_use_dec(&ctx->table->use);
450 nft_deactivate_next(ctx->net, ctx->chain);
455 void nft_rule_expr_activate(const struct nft_ctx *ctx, struct nft_rule *rule)
457 struct nft_expr *expr;
459 expr = nft_expr_first(rule);
460 while (nft_expr_more(rule, expr)) {
461 if (expr->ops->activate)
462 expr->ops->activate(ctx, expr);
464 expr = nft_expr_next(expr);
468 void nft_rule_expr_deactivate(const struct nft_ctx *ctx, struct nft_rule *rule,
469 enum nft_trans_phase phase)
471 struct nft_expr *expr;
473 expr = nft_expr_first(rule);
474 while (nft_expr_more(rule, expr)) {
475 if (expr->ops->deactivate)
476 expr->ops->deactivate(ctx, expr, phase);
478 expr = nft_expr_next(expr);
483 nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule)
485 /* You cannot delete the same rule twice */
486 if (nft_is_active_next(ctx->net, rule)) {
487 nft_deactivate_next(ctx->net, rule);
488 nft_use_dec(&ctx->chain->use);
494 static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type,
495 struct nft_rule *rule)
497 struct nft_trans *trans;
499 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule));
503 if (msg_type == NFT_MSG_NEWRULE && ctx->nla[NFTA_RULE_ID] != NULL) {
504 nft_trans_rule_id(trans) =
505 ntohl(nla_get_be32(ctx->nla[NFTA_RULE_ID]));
507 nft_trans_rule(trans) = rule;
508 nft_trans_commit_list_add_tail(ctx->net, trans);
513 static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule)
515 struct nft_flow_rule *flow;
516 struct nft_trans *trans;
519 trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule);
523 if (ctx->chain->flags & NFT_CHAIN_HW_OFFLOAD) {
524 flow = nft_flow_rule_create(ctx->net, rule);
526 nft_trans_destroy(trans);
527 return PTR_ERR(flow);
530 nft_trans_flow_rule(trans) = flow;
533 err = nf_tables_delrule_deactivate(ctx, rule);
535 nft_trans_destroy(trans);
538 nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_PREPARE);
543 static int nft_delrule_by_chain(struct nft_ctx *ctx)
545 struct nft_rule *rule;
548 list_for_each_entry(rule, &ctx->chain->rules, list) {
549 if (!nft_is_active_next(ctx->net, rule))
552 err = nft_delrule(ctx, rule);
559 static int __nft_trans_set_add(const struct nft_ctx *ctx, int msg_type,
561 const struct nft_set_desc *desc)
563 struct nft_trans *trans;
565 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
569 if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] && !desc) {
570 nft_trans_set_id(trans) =
571 ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
572 nft_activate_next(ctx->net, set);
574 nft_trans_set(trans) = set;
576 nft_trans_set_update(trans) = true;
577 nft_trans_set_gc_int(trans) = desc->gc_int;
578 nft_trans_set_timeout(trans) = desc->timeout;
579 nft_trans_set_size(trans) = desc->size;
581 nft_trans_commit_list_add_tail(ctx->net, trans);
586 static int nft_trans_set_add(const struct nft_ctx *ctx, int msg_type,
589 return __nft_trans_set_add(ctx, msg_type, set, NULL);
592 static int nft_mapelem_deactivate(const struct nft_ctx *ctx,
594 const struct nft_set_iter *iter,
595 struct nft_elem_priv *elem_priv)
597 nft_setelem_data_deactivate(ctx->net, set, elem_priv);
602 struct nft_set_elem_catchall {
603 struct list_head list;
605 struct nft_elem_priv *elem;
608 static void nft_map_catchall_deactivate(const struct nft_ctx *ctx,
611 u8 genmask = nft_genmask_next(ctx->net);
612 struct nft_set_elem_catchall *catchall;
613 struct nft_set_ext *ext;
615 list_for_each_entry(catchall, &set->catchall_list, list) {
616 ext = nft_set_elem_ext(set, catchall->elem);
617 if (!nft_set_elem_active(ext, genmask))
620 nft_setelem_data_deactivate(ctx->net, set, catchall->elem);
625 static void nft_map_deactivate(const struct nft_ctx *ctx, struct nft_set *set)
627 struct nft_set_iter iter = {
628 .genmask = nft_genmask_next(ctx->net),
629 .fn = nft_mapelem_deactivate,
632 set->ops->walk(ctx, set, &iter);
633 WARN_ON_ONCE(iter.err);
635 nft_map_catchall_deactivate(ctx, set);
638 static int nft_delset(const struct nft_ctx *ctx, struct nft_set *set)
642 err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set);
646 if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
647 nft_map_deactivate(ctx, set);
649 nft_deactivate_next(ctx->net, set);
650 nft_use_dec(&ctx->table->use);
655 static int nft_trans_obj_add(struct nft_ctx *ctx, int msg_type,
656 struct nft_object *obj)
658 struct nft_trans *trans;
660 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_obj));
664 if (msg_type == NFT_MSG_NEWOBJ)
665 nft_activate_next(ctx->net, obj);
667 nft_trans_obj(trans) = obj;
668 nft_trans_commit_list_add_tail(ctx->net, trans);
673 static int nft_delobj(struct nft_ctx *ctx, struct nft_object *obj)
677 err = nft_trans_obj_add(ctx, NFT_MSG_DELOBJ, obj);
681 nft_deactivate_next(ctx->net, obj);
682 nft_use_dec(&ctx->table->use);
687 static struct nft_trans *
688 nft_trans_flowtable_add(struct nft_ctx *ctx, int msg_type,
689 struct nft_flowtable *flowtable)
691 struct nft_trans *trans;
693 trans = nft_trans_alloc(ctx, msg_type,
694 sizeof(struct nft_trans_flowtable));
696 return ERR_PTR(-ENOMEM);
698 if (msg_type == NFT_MSG_NEWFLOWTABLE)
699 nft_activate_next(ctx->net, flowtable);
701 INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
702 nft_trans_flowtable(trans) = flowtable;
703 nft_trans_commit_list_add_tail(ctx->net, trans);
708 static int nft_delflowtable(struct nft_ctx *ctx,
709 struct nft_flowtable *flowtable)
711 struct nft_trans *trans;
713 trans = nft_trans_flowtable_add(ctx, NFT_MSG_DELFLOWTABLE, flowtable);
715 return PTR_ERR(trans);
717 nft_deactivate_next(ctx->net, flowtable);
718 nft_use_dec(&ctx->table->use);
723 static void __nft_reg_track_clobber(struct nft_regs_track *track, u8 dreg)
727 for (i = track->regs[dreg].num_reg; i > 0; i--)
728 __nft_reg_track_cancel(track, dreg - i);
731 static void __nft_reg_track_update(struct nft_regs_track *track,
732 const struct nft_expr *expr,
735 track->regs[dreg].selector = expr;
736 track->regs[dreg].bitwise = NULL;
737 track->regs[dreg].num_reg = num_reg;
740 void nft_reg_track_update(struct nft_regs_track *track,
741 const struct nft_expr *expr, u8 dreg, u8 len)
743 unsigned int regcount;
746 __nft_reg_track_clobber(track, dreg);
748 regcount = DIV_ROUND_UP(len, NFT_REG32_SIZE);
749 for (i = 0; i < regcount; i++, dreg++)
750 __nft_reg_track_update(track, expr, dreg, i);
752 EXPORT_SYMBOL_GPL(nft_reg_track_update);
754 void nft_reg_track_cancel(struct nft_regs_track *track, u8 dreg, u8 len)
756 unsigned int regcount;
759 __nft_reg_track_clobber(track, dreg);
761 regcount = DIV_ROUND_UP(len, NFT_REG32_SIZE);
762 for (i = 0; i < regcount; i++, dreg++)
763 __nft_reg_track_cancel(track, dreg);
765 EXPORT_SYMBOL_GPL(nft_reg_track_cancel);
767 void __nft_reg_track_cancel(struct nft_regs_track *track, u8 dreg)
769 track->regs[dreg].selector = NULL;
770 track->regs[dreg].bitwise = NULL;
771 track->regs[dreg].num_reg = 0;
773 EXPORT_SYMBOL_GPL(__nft_reg_track_cancel);
779 static struct nft_table *nft_table_lookup(const struct net *net,
780 const struct nlattr *nla,
781 u8 family, u8 genmask, u32 nlpid)
783 struct nftables_pernet *nft_net;
784 struct nft_table *table;
787 return ERR_PTR(-EINVAL);
789 nft_net = nft_pernet(net);
790 list_for_each_entry_rcu(table, &nft_net->tables, list,
791 lockdep_is_held(&nft_net->commit_mutex)) {
792 if (!nla_strcmp(nla, table->name) &&
793 table->family == family &&
794 nft_active_genmask(table, genmask)) {
795 if (nft_table_has_owner(table) &&
796 nlpid && table->nlpid != nlpid)
797 return ERR_PTR(-EPERM);
803 return ERR_PTR(-ENOENT);
806 static struct nft_table *nft_table_lookup_byhandle(const struct net *net,
807 const struct nlattr *nla,
808 int family, u8 genmask, u32 nlpid)
810 struct nftables_pernet *nft_net;
811 struct nft_table *table;
813 nft_net = nft_pernet(net);
814 list_for_each_entry(table, &nft_net->tables, list) {
815 if (be64_to_cpu(nla_get_be64(nla)) == table->handle &&
816 table->family == family &&
817 nft_active_genmask(table, genmask)) {
818 if (nft_table_has_owner(table) &&
819 nlpid && table->nlpid != nlpid)
820 return ERR_PTR(-EPERM);
826 return ERR_PTR(-ENOENT);
829 static inline u64 nf_tables_alloc_handle(struct nft_table *table)
831 return ++table->hgenerator;
834 static const struct nft_chain_type *chain_type[NFPROTO_NUMPROTO][NFT_CHAIN_T_MAX];
836 static const struct nft_chain_type *
837 __nft_chain_type_get(u8 family, enum nft_chain_types type)
839 if (family >= NFPROTO_NUMPROTO ||
840 type >= NFT_CHAIN_T_MAX)
843 return chain_type[family][type];
846 static const struct nft_chain_type *
847 __nf_tables_chain_type_lookup(const struct nlattr *nla, u8 family)
849 const struct nft_chain_type *type;
852 for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
853 type = __nft_chain_type_get(family, i);
856 if (!nla_strcmp(nla, type->name))
862 struct nft_module_request {
863 struct list_head list;
864 char module[MODULE_NAME_LEN];
868 #ifdef CONFIG_MODULES
869 __printf(2, 3) int nft_request_module(struct net *net, const char *fmt,
872 char module_name[MODULE_NAME_LEN];
873 struct nftables_pernet *nft_net;
874 struct nft_module_request *req;
879 ret = vsnprintf(module_name, MODULE_NAME_LEN, fmt, args);
881 if (ret >= MODULE_NAME_LEN)
884 nft_net = nft_pernet(net);
885 list_for_each_entry(req, &nft_net->module_list, list) {
886 if (!strcmp(req->module, module_name)) {
890 /* A request to load this module already exists. */
895 req = kmalloc(sizeof(*req), GFP_KERNEL);
900 strscpy(req->module, module_name, MODULE_NAME_LEN);
901 list_add_tail(&req->list, &nft_net->module_list);
905 EXPORT_SYMBOL_GPL(nft_request_module);
908 static void lockdep_nfnl_nft_mutex_not_held(void)
910 #ifdef CONFIG_PROVE_LOCKING
912 WARN_ON_ONCE(lockdep_nfnl_is_held(NFNL_SUBSYS_NFTABLES));
916 static const struct nft_chain_type *
917 nf_tables_chain_type_lookup(struct net *net, const struct nlattr *nla,
918 u8 family, bool autoload)
920 const struct nft_chain_type *type;
922 type = __nf_tables_chain_type_lookup(nla, family);
926 lockdep_nfnl_nft_mutex_not_held();
927 #ifdef CONFIG_MODULES
929 if (nft_request_module(net, "nft-chain-%u-%.*s", family,
931 (const char *)nla_data(nla)) == -EAGAIN)
932 return ERR_PTR(-EAGAIN);
935 return ERR_PTR(-ENOENT);
938 static __be16 nft_base_seq(const struct net *net)
940 struct nftables_pernet *nft_net = nft_pernet(net);
942 return htons(nft_net->base_seq & 0xffff);
945 static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
946 [NFTA_TABLE_NAME] = { .type = NLA_STRING,
947 .len = NFT_TABLE_MAXNAMELEN - 1 },
948 [NFTA_TABLE_FLAGS] = { .type = NLA_U32 },
949 [NFTA_TABLE_HANDLE] = { .type = NLA_U64 },
950 [NFTA_TABLE_USERDATA] = { .type = NLA_BINARY,
951 .len = NFT_USERDATA_MAXLEN }
954 static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
955 u32 portid, u32 seq, int event, u32 flags,
956 int family, const struct nft_table *table)
958 struct nlmsghdr *nlh;
960 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
961 nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
962 NFNETLINK_V0, nft_base_seq(net));
964 goto nla_put_failure;
966 if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
967 nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)) ||
968 nla_put_be64(skb, NFTA_TABLE_HANDLE, cpu_to_be64(table->handle),
970 goto nla_put_failure;
972 if (event == NFT_MSG_DELTABLE) {
977 if (nla_put_be32(skb, NFTA_TABLE_FLAGS,
978 htonl(table->flags & NFT_TABLE_F_MASK)))
979 goto nla_put_failure;
981 if (nft_table_has_owner(table) &&
982 nla_put_be32(skb, NFTA_TABLE_OWNER, htonl(table->nlpid)))
983 goto nla_put_failure;
986 if (nla_put(skb, NFTA_TABLE_USERDATA, table->udlen, table->udata))
987 goto nla_put_failure;
994 nlmsg_trim(skb, nlh);
998 struct nftnl_skb_parms {
1001 #define NFT_CB(skb) (*(struct nftnl_skb_parms*)&((skb)->cb))
1003 static void nft_notify_enqueue(struct sk_buff *skb, bool report,
1004 struct list_head *notify_list)
1006 NFT_CB(skb).report = report;
1007 list_add_tail(&skb->list, notify_list);
1010 static void nf_tables_table_notify(const struct nft_ctx *ctx, int event)
1012 struct nftables_pernet *nft_net;
1013 struct sk_buff *skb;
1018 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1021 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1025 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
1026 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
1028 err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
1029 event, flags, ctx->family, ctx->table);
1035 nft_net = nft_pernet(ctx->net);
1036 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
1039 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
1042 static int nf_tables_dump_tables(struct sk_buff *skb,
1043 struct netlink_callback *cb)
1045 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1046 struct nftables_pernet *nft_net;
1047 const struct nft_table *table;
1048 unsigned int idx = 0, s_idx = cb->args[0];
1049 struct net *net = sock_net(skb->sk);
1050 int family = nfmsg->nfgen_family;
1053 nft_net = nft_pernet(net);
1054 cb->seq = READ_ONCE(nft_net->base_seq);
1056 list_for_each_entry_rcu(table, &nft_net->tables, list) {
1057 if (family != NFPROTO_UNSPEC && family != table->family)
1063 memset(&cb->args[1], 0,
1064 sizeof(cb->args) - sizeof(cb->args[0]));
1065 if (!nft_is_active(net, table))
1067 if (nf_tables_fill_table_info(skb, net,
1068 NETLINK_CB(cb->skb).portid,
1070 NFT_MSG_NEWTABLE, NLM_F_MULTI,
1071 table->family, table) < 0)
1074 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1084 static int nft_netlink_dump_start_rcu(struct sock *nlsk, struct sk_buff *skb,
1085 const struct nlmsghdr *nlh,
1086 struct netlink_dump_control *c)
1090 if (!try_module_get(THIS_MODULE))
1094 err = netlink_dump_start(nlsk, skb, nlh, c);
1096 module_put(THIS_MODULE);
1101 /* called with rcu_read_lock held */
1102 static int nf_tables_gettable(struct sk_buff *skb, const struct nfnl_info *info,
1103 const struct nlattr * const nla[])
1105 struct netlink_ext_ack *extack = info->extack;
1106 u8 genmask = nft_genmask_cur(info->net);
1107 u8 family = info->nfmsg->nfgen_family;
1108 const struct nft_table *table;
1109 struct net *net = info->net;
1110 struct sk_buff *skb2;
1113 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
1114 struct netlink_dump_control c = {
1115 .dump = nf_tables_dump_tables,
1116 .module = THIS_MODULE,
1119 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
1122 table = nft_table_lookup(net, nla[NFTA_TABLE_NAME], family, genmask, 0);
1123 if (IS_ERR(table)) {
1124 NL_SET_BAD_ATTR(extack, nla[NFTA_TABLE_NAME]);
1125 return PTR_ERR(table);
1128 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1132 err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
1133 info->nlh->nlmsg_seq, NFT_MSG_NEWTABLE,
1136 goto err_fill_table_info;
1138 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
1140 err_fill_table_info:
1145 static void nft_table_disable(struct net *net, struct nft_table *table, u32 cnt)
1147 struct nft_chain *chain;
1150 list_for_each_entry(chain, &table->chains, list) {
1151 if (!nft_is_active_next(net, chain))
1153 if (!nft_is_base_chain(chain))
1156 if (cnt && i++ == cnt)
1159 nf_tables_unregister_hook(net, table, chain);
1163 static int nf_tables_table_enable(struct net *net, struct nft_table *table)
1165 struct nft_chain *chain;
1168 list_for_each_entry(chain, &table->chains, list) {
1169 if (!nft_is_active_next(net, chain))
1171 if (!nft_is_base_chain(chain))
1174 err = nf_tables_register_hook(net, table, chain);
1176 goto err_register_hooks;
1184 nft_table_disable(net, table, i);
1188 static void nf_tables_table_disable(struct net *net, struct nft_table *table)
1190 table->flags &= ~NFT_TABLE_F_DORMANT;
1191 nft_table_disable(net, table, 0);
1192 table->flags |= NFT_TABLE_F_DORMANT;
1195 #define __NFT_TABLE_F_INTERNAL (NFT_TABLE_F_MASK + 1)
1196 #define __NFT_TABLE_F_WAS_DORMANT (__NFT_TABLE_F_INTERNAL << 0)
1197 #define __NFT_TABLE_F_WAS_AWAKEN (__NFT_TABLE_F_INTERNAL << 1)
1198 #define __NFT_TABLE_F_WAS_ORPHAN (__NFT_TABLE_F_INTERNAL << 2)
1199 #define __NFT_TABLE_F_UPDATE (__NFT_TABLE_F_WAS_DORMANT | \
1200 __NFT_TABLE_F_WAS_AWAKEN | \
1201 __NFT_TABLE_F_WAS_ORPHAN)
1203 static int nf_tables_updtable(struct nft_ctx *ctx)
1205 struct nft_trans *trans;
1209 if (!ctx->nla[NFTA_TABLE_FLAGS])
1212 flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
1213 if (flags & ~NFT_TABLE_F_MASK)
1216 if (flags == ctx->table->flags)
1219 if ((nft_table_has_owner(ctx->table) &&
1220 !(flags & NFT_TABLE_F_OWNER)) ||
1221 (flags & NFT_TABLE_F_OWNER &&
1222 !nft_table_is_orphan(ctx->table)))
1225 if ((flags ^ ctx->table->flags) & NFT_TABLE_F_PERSIST)
1228 /* No dormant off/on/off/on games in single transaction */
1229 if (ctx->table->flags & __NFT_TABLE_F_UPDATE)
1232 trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
1233 sizeof(struct nft_trans_table));
1237 if ((flags & NFT_TABLE_F_DORMANT) &&
1238 !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
1239 ctx->table->flags |= NFT_TABLE_F_DORMANT;
1240 if (!(ctx->table->flags & __NFT_TABLE_F_UPDATE))
1241 ctx->table->flags |= __NFT_TABLE_F_WAS_AWAKEN;
1242 } else if (!(flags & NFT_TABLE_F_DORMANT) &&
1243 ctx->table->flags & NFT_TABLE_F_DORMANT) {
1244 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
1245 if (!(ctx->table->flags & __NFT_TABLE_F_UPDATE)) {
1246 ret = nf_tables_table_enable(ctx->net, ctx->table);
1248 goto err_register_hooks;
1250 ctx->table->flags |= __NFT_TABLE_F_WAS_DORMANT;
1254 if ((flags & NFT_TABLE_F_OWNER) &&
1255 !nft_table_has_owner(ctx->table)) {
1256 ctx->table->nlpid = ctx->portid;
1257 ctx->table->flags |= NFT_TABLE_F_OWNER |
1258 __NFT_TABLE_F_WAS_ORPHAN;
1261 nft_trans_table_update(trans) = true;
1262 nft_trans_commit_list_add_tail(ctx->net, trans);
1267 ctx->table->flags |= NFT_TABLE_F_DORMANT;
1268 nft_trans_destroy(trans);
1272 static u32 nft_chain_hash(const void *data, u32 len, u32 seed)
1274 const char *name = data;
1276 return jhash(name, strlen(name), seed);
1279 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed)
1281 const struct nft_chain *chain = data;
1283 return nft_chain_hash(chain->name, 0, seed);
1286 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *arg,
1289 const struct nft_chain *chain = ptr;
1290 const char *name = arg->key;
1292 return strcmp(chain->name, name);
1295 static u32 nft_objname_hash(const void *data, u32 len, u32 seed)
1297 const struct nft_object_hash_key *k = data;
1299 seed ^= hash_ptr(k->table, 32);
1301 return jhash(k->name, strlen(k->name), seed);
1304 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed)
1306 const struct nft_object *obj = data;
1308 return nft_objname_hash(&obj->key, 0, seed);
1311 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *arg,
1314 const struct nft_object_hash_key *k = arg->key;
1315 const struct nft_object *obj = ptr;
1317 if (obj->key.table != k->table)
1320 return strcmp(obj->key.name, k->name);
1323 static bool nft_supported_family(u8 family)
1326 #ifdef CONFIG_NF_TABLES_INET
1327 || family == NFPROTO_INET
1329 #ifdef CONFIG_NF_TABLES_IPV4
1330 || family == NFPROTO_IPV4
1332 #ifdef CONFIG_NF_TABLES_ARP
1333 || family == NFPROTO_ARP
1335 #ifdef CONFIG_NF_TABLES_NETDEV
1336 || family == NFPROTO_NETDEV
1338 #if IS_ENABLED(CONFIG_NF_TABLES_BRIDGE)
1339 || family == NFPROTO_BRIDGE
1341 #ifdef CONFIG_NF_TABLES_IPV6
1342 || family == NFPROTO_IPV6
1347 static int nf_tables_newtable(struct sk_buff *skb, const struct nfnl_info *info,
1348 const struct nlattr * const nla[])
1350 struct nftables_pernet *nft_net = nft_pernet(info->net);
1351 struct netlink_ext_ack *extack = info->extack;
1352 u8 genmask = nft_genmask_next(info->net);
1353 u8 family = info->nfmsg->nfgen_family;
1354 struct net *net = info->net;
1355 const struct nlattr *attr;
1356 struct nft_table *table;
1361 if (!nft_supported_family(family))
1364 lockdep_assert_held(&nft_net->commit_mutex);
1365 attr = nla[NFTA_TABLE_NAME];
1366 table = nft_table_lookup(net, attr, family, genmask,
1367 NETLINK_CB(skb).portid);
1368 if (IS_ERR(table)) {
1369 if (PTR_ERR(table) != -ENOENT)
1370 return PTR_ERR(table);
1372 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
1373 NL_SET_BAD_ATTR(extack, attr);
1376 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
1379 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
1381 return nf_tables_updtable(&ctx);
1384 if (nla[NFTA_TABLE_FLAGS]) {
1385 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
1386 if (flags & ~NFT_TABLE_F_MASK)
1391 table = kzalloc(sizeof(*table), GFP_KERNEL_ACCOUNT);
1395 table->validate_state = nft_net->validate_state;
1396 table->name = nla_strdup(attr, GFP_KERNEL_ACCOUNT);
1397 if (table->name == NULL)
1400 if (nla[NFTA_TABLE_USERDATA]) {
1401 table->udata = nla_memdup(nla[NFTA_TABLE_USERDATA], GFP_KERNEL_ACCOUNT);
1402 if (table->udata == NULL)
1403 goto err_table_udata;
1405 table->udlen = nla_len(nla[NFTA_TABLE_USERDATA]);
1408 err = rhltable_init(&table->chains_ht, &nft_chain_ht_params);
1412 INIT_LIST_HEAD(&table->chains);
1413 INIT_LIST_HEAD(&table->sets);
1414 INIT_LIST_HEAD(&table->objects);
1415 INIT_LIST_HEAD(&table->flowtables);
1416 table->family = family;
1417 table->flags = flags;
1418 table->handle = ++nft_net->table_handle;
1419 if (table->flags & NFT_TABLE_F_OWNER)
1420 table->nlpid = NETLINK_CB(skb).portid;
1422 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
1423 err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
1427 list_add_tail_rcu(&table->list, &nft_net->tables);
1430 rhltable_destroy(&table->chains_ht);
1432 kfree(table->udata);
1441 static int nft_flush_table(struct nft_ctx *ctx)
1443 struct nft_flowtable *flowtable, *nft;
1444 struct nft_chain *chain, *nc;
1445 struct nft_object *obj, *ne;
1446 struct nft_set *set, *ns;
1449 list_for_each_entry(chain, &ctx->table->chains, list) {
1450 if (!nft_is_active_next(ctx->net, chain))
1453 if (nft_chain_binding(chain))
1458 err = nft_delrule_by_chain(ctx);
1463 list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
1464 if (!nft_is_active_next(ctx->net, set))
1467 if (nft_set_is_anonymous(set))
1470 err = nft_delset(ctx, set);
1475 list_for_each_entry_safe(flowtable, nft, &ctx->table->flowtables, list) {
1476 if (!nft_is_active_next(ctx->net, flowtable))
1479 err = nft_delflowtable(ctx, flowtable);
1484 list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) {
1485 if (!nft_is_active_next(ctx->net, obj))
1488 err = nft_delobj(ctx, obj);
1493 list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
1494 if (!nft_is_active_next(ctx->net, chain))
1497 if (nft_chain_binding(chain))
1502 err = nft_delchain(ctx);
1507 err = nft_deltable(ctx);
1512 static int nft_flush(struct nft_ctx *ctx, int family)
1514 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
1515 const struct nlattr * const *nla = ctx->nla;
1516 struct nft_table *table, *nt;
1519 list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
1520 if (family != AF_UNSPEC && table->family != family)
1523 ctx->family = table->family;
1525 if (!nft_is_active_next(ctx->net, table))
1528 if (nft_table_has_owner(table) && table->nlpid != ctx->portid)
1531 if (nla[NFTA_TABLE_NAME] &&
1532 nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
1537 err = nft_flush_table(ctx);
1545 static int nf_tables_deltable(struct sk_buff *skb, const struct nfnl_info *info,
1546 const struct nlattr * const nla[])
1548 struct netlink_ext_ack *extack = info->extack;
1549 u8 genmask = nft_genmask_next(info->net);
1550 u8 family = info->nfmsg->nfgen_family;
1551 struct net *net = info->net;
1552 const struct nlattr *attr;
1553 struct nft_table *table;
1556 nft_ctx_init(&ctx, net, skb, info->nlh, 0, NULL, NULL, nla);
1557 if (family == AF_UNSPEC ||
1558 (!nla[NFTA_TABLE_NAME] && !nla[NFTA_TABLE_HANDLE]))
1559 return nft_flush(&ctx, family);
1561 if (nla[NFTA_TABLE_HANDLE]) {
1562 attr = nla[NFTA_TABLE_HANDLE];
1563 table = nft_table_lookup_byhandle(net, attr, family, genmask,
1564 NETLINK_CB(skb).portid);
1566 attr = nla[NFTA_TABLE_NAME];
1567 table = nft_table_lookup(net, attr, family, genmask,
1568 NETLINK_CB(skb).portid);
1571 if (IS_ERR(table)) {
1572 if (PTR_ERR(table) == -ENOENT &&
1573 NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYTABLE)
1576 NL_SET_BAD_ATTR(extack, attr);
1577 return PTR_ERR(table);
1580 if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
1584 ctx.family = family;
1587 return nft_flush_table(&ctx);
1590 static void nf_tables_table_destroy(struct nft_ctx *ctx)
1592 if (WARN_ON(ctx->table->use > 0))
1595 rhltable_destroy(&ctx->table->chains_ht);
1596 kfree(ctx->table->name);
1597 kfree(ctx->table->udata);
1601 void nft_register_chain_type(const struct nft_chain_type *ctype)
1603 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1604 if (WARN_ON(__nft_chain_type_get(ctype->family, ctype->type))) {
1605 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1608 chain_type[ctype->family][ctype->type] = ctype;
1609 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1611 EXPORT_SYMBOL_GPL(nft_register_chain_type);
1613 void nft_unregister_chain_type(const struct nft_chain_type *ctype)
1615 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1616 chain_type[ctype->family][ctype->type] = NULL;
1617 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1619 EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
1625 static struct nft_chain *
1626 nft_chain_lookup_byhandle(const struct nft_table *table, u64 handle, u8 genmask)
1628 struct nft_chain *chain;
1630 list_for_each_entry(chain, &table->chains, list) {
1631 if (chain->handle == handle &&
1632 nft_active_genmask(chain, genmask))
1636 return ERR_PTR(-ENOENT);
1639 static bool lockdep_commit_lock_is_held(const struct net *net)
1641 #ifdef CONFIG_PROVE_LOCKING
1642 struct nftables_pernet *nft_net = nft_pernet(net);
1644 return lockdep_is_held(&nft_net->commit_mutex);
1650 static struct nft_chain *nft_chain_lookup(struct net *net,
1651 struct nft_table *table,
1652 const struct nlattr *nla, u8 genmask)
1654 char search[NFT_CHAIN_MAXNAMELEN + 1];
1655 struct rhlist_head *tmp, *list;
1656 struct nft_chain *chain;
1659 return ERR_PTR(-EINVAL);
1661 nla_strscpy(search, nla, sizeof(search));
1663 WARN_ON(!rcu_read_lock_held() &&
1664 !lockdep_commit_lock_is_held(net));
1666 chain = ERR_PTR(-ENOENT);
1668 list = rhltable_lookup(&table->chains_ht, search, nft_chain_ht_params);
1672 rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
1673 if (nft_active_genmask(chain, genmask))
1676 chain = ERR_PTR(-ENOENT);
1682 static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
1683 [NFTA_CHAIN_TABLE] = { .type = NLA_STRING,
1684 .len = NFT_TABLE_MAXNAMELEN - 1 },
1685 [NFTA_CHAIN_HANDLE] = { .type = NLA_U64 },
1686 [NFTA_CHAIN_NAME] = { .type = NLA_STRING,
1687 .len = NFT_CHAIN_MAXNAMELEN - 1 },
1688 [NFTA_CHAIN_HOOK] = { .type = NLA_NESTED },
1689 [NFTA_CHAIN_POLICY] = { .type = NLA_U32 },
1690 [NFTA_CHAIN_TYPE] = { .type = NLA_STRING,
1691 .len = NFT_MODULE_AUTOLOAD_LIMIT },
1692 [NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED },
1693 [NFTA_CHAIN_FLAGS] = { .type = NLA_U32 },
1694 [NFTA_CHAIN_ID] = { .type = NLA_U32 },
1695 [NFTA_CHAIN_USERDATA] = { .type = NLA_BINARY,
1696 .len = NFT_USERDATA_MAXLEN },
1699 static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
1700 [NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 },
1701 [NFTA_HOOK_PRIORITY] = { .type = NLA_U32 },
1702 [NFTA_HOOK_DEV] = { .type = NLA_STRING,
1703 .len = IFNAMSIZ - 1 },
1706 static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
1708 struct nft_stats *cpu_stats, total;
1709 struct nlattr *nest;
1717 memset(&total, 0, sizeof(total));
1718 for_each_possible_cpu(cpu) {
1719 cpu_stats = per_cpu_ptr(stats, cpu);
1721 seq = u64_stats_fetch_begin(&cpu_stats->syncp);
1722 pkts = cpu_stats->pkts;
1723 bytes = cpu_stats->bytes;
1724 } while (u64_stats_fetch_retry(&cpu_stats->syncp, seq));
1726 total.bytes += bytes;
1728 nest = nla_nest_start_noflag(skb, NFTA_CHAIN_COUNTERS);
1730 goto nla_put_failure;
1732 if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts),
1733 NFTA_COUNTER_PAD) ||
1734 nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
1736 goto nla_put_failure;
1738 nla_nest_end(skb, nest);
1745 static int nft_dump_basechain_hook(struct sk_buff *skb, int family,
1746 const struct nft_base_chain *basechain,
1747 const struct list_head *hook_list)
1749 const struct nf_hook_ops *ops = &basechain->ops;
1750 struct nft_hook *hook, *first = NULL;
1751 struct nlattr *nest, *nest_devs;
1754 nest = nla_nest_start_noflag(skb, NFTA_CHAIN_HOOK);
1756 goto nla_put_failure;
1757 if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
1758 goto nla_put_failure;
1759 if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
1760 goto nla_put_failure;
1762 if (nft_base_chain_netdev(family, ops->hooknum)) {
1763 nest_devs = nla_nest_start_noflag(skb, NFTA_HOOK_DEVS);
1765 goto nla_put_failure;
1768 hook_list = &basechain->hook_list;
1770 list_for_each_entry(hook, hook_list, list) {
1774 if (nla_put_string(skb, NFTA_DEVICE_NAME,
1775 hook->ops.dev->name))
1776 goto nla_put_failure;
1779 nla_nest_end(skb, nest_devs);
1782 nla_put_string(skb, NFTA_HOOK_DEV, first->ops.dev->name))
1783 goto nla_put_failure;
1785 nla_nest_end(skb, nest);
1792 static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
1793 u32 portid, u32 seq, int event, u32 flags,
1794 int family, const struct nft_table *table,
1795 const struct nft_chain *chain,
1796 const struct list_head *hook_list)
1798 struct nlmsghdr *nlh;
1800 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
1801 nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
1802 NFNETLINK_V0, nft_base_seq(net));
1804 goto nla_put_failure;
1806 if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name) ||
1807 nla_put_string(skb, NFTA_CHAIN_NAME, chain->name) ||
1808 nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle),
1810 goto nla_put_failure;
1812 if (event == NFT_MSG_DELCHAIN && !hook_list) {
1813 nlmsg_end(skb, nlh);
1817 if (nft_is_base_chain(chain)) {
1818 const struct nft_base_chain *basechain = nft_base_chain(chain);
1819 struct nft_stats __percpu *stats;
1821 if (nft_dump_basechain_hook(skb, family, basechain, hook_list))
1822 goto nla_put_failure;
1824 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
1825 htonl(basechain->policy)))
1826 goto nla_put_failure;
1828 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
1829 goto nla_put_failure;
1831 stats = rcu_dereference_check(basechain->stats,
1832 lockdep_commit_lock_is_held(net));
1833 if (nft_dump_stats(skb, stats))
1834 goto nla_put_failure;
1838 nla_put_be32(skb, NFTA_CHAIN_FLAGS, htonl(chain->flags)))
1839 goto nla_put_failure;
1841 if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
1842 goto nla_put_failure;
1845 nla_put(skb, NFTA_CHAIN_USERDATA, chain->udlen, chain->udata))
1846 goto nla_put_failure;
1848 nlmsg_end(skb, nlh);
1852 nlmsg_trim(skb, nlh);
1856 static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event,
1857 const struct list_head *hook_list)
1859 struct nftables_pernet *nft_net;
1860 struct sk_buff *skb;
1865 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1868 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1872 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
1873 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
1875 err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
1876 event, flags, ctx->family, ctx->table,
1877 ctx->chain, hook_list);
1883 nft_net = nft_pernet(ctx->net);
1884 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
1887 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
1890 static int nf_tables_dump_chains(struct sk_buff *skb,
1891 struct netlink_callback *cb)
1893 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1894 unsigned int idx = 0, s_idx = cb->args[0];
1895 struct net *net = sock_net(skb->sk);
1896 int family = nfmsg->nfgen_family;
1897 struct nftables_pernet *nft_net;
1898 const struct nft_table *table;
1899 const struct nft_chain *chain;
1902 nft_net = nft_pernet(net);
1903 cb->seq = READ_ONCE(nft_net->base_seq);
1905 list_for_each_entry_rcu(table, &nft_net->tables, list) {
1906 if (family != NFPROTO_UNSPEC && family != table->family)
1909 list_for_each_entry_rcu(chain, &table->chains, list) {
1913 memset(&cb->args[1], 0,
1914 sizeof(cb->args) - sizeof(cb->args[0]));
1915 if (!nft_is_active(net, chain))
1917 if (nf_tables_fill_chain_info(skb, net,
1918 NETLINK_CB(cb->skb).portid,
1922 table->family, table,
1926 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1937 /* called with rcu_read_lock held */
1938 static int nf_tables_getchain(struct sk_buff *skb, const struct nfnl_info *info,
1939 const struct nlattr * const nla[])
1941 struct netlink_ext_ack *extack = info->extack;
1942 u8 genmask = nft_genmask_cur(info->net);
1943 u8 family = info->nfmsg->nfgen_family;
1944 const struct nft_chain *chain;
1945 struct net *net = info->net;
1946 struct nft_table *table;
1947 struct sk_buff *skb2;
1950 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
1951 struct netlink_dump_control c = {
1952 .dump = nf_tables_dump_chains,
1953 .module = THIS_MODULE,
1956 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
1959 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask, 0);
1960 if (IS_ERR(table)) {
1961 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
1962 return PTR_ERR(table);
1965 chain = nft_chain_lookup(net, table, nla[NFTA_CHAIN_NAME], genmask);
1966 if (IS_ERR(chain)) {
1967 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
1968 return PTR_ERR(chain);
1971 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1975 err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
1976 info->nlh->nlmsg_seq, NFT_MSG_NEWCHAIN,
1977 0, family, table, chain, NULL);
1979 goto err_fill_chain_info;
1981 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
1983 err_fill_chain_info:
1988 static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
1989 [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 },
1990 [NFTA_COUNTER_BYTES] = { .type = NLA_U64 },
1993 static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
1995 struct nlattr *tb[NFTA_COUNTER_MAX+1];
1996 struct nft_stats __percpu *newstats;
1997 struct nft_stats *stats;
2000 err = nla_parse_nested_deprecated(tb, NFTA_COUNTER_MAX, attr,
2001 nft_counter_policy, NULL);
2003 return ERR_PTR(err);
2005 if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
2006 return ERR_PTR(-EINVAL);
2008 newstats = netdev_alloc_pcpu_stats(struct nft_stats);
2009 if (newstats == NULL)
2010 return ERR_PTR(-ENOMEM);
2012 /* Restore old counters on this cpu, no problem. Per-cpu statistics
2013 * are not exposed to userspace.
2016 stats = this_cpu_ptr(newstats);
2017 stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
2018 stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
2024 static void nft_chain_stats_replace(struct nft_trans *trans)
2026 struct nft_base_chain *chain = nft_base_chain(trans->ctx.chain);
2028 if (!nft_trans_chain_stats(trans))
2031 nft_trans_chain_stats(trans) =
2032 rcu_replace_pointer(chain->stats, nft_trans_chain_stats(trans),
2033 lockdep_commit_lock_is_held(trans->ctx.net));
2035 if (!nft_trans_chain_stats(trans))
2036 static_branch_inc(&nft_counters_enabled);
2039 static void nf_tables_chain_free_chain_rules(struct nft_chain *chain)
2041 struct nft_rule_blob *g0 = rcu_dereference_raw(chain->blob_gen_0);
2042 struct nft_rule_blob *g1 = rcu_dereference_raw(chain->blob_gen_1);
2048 /* should be NULL either via abort or via successful commit */
2049 WARN_ON_ONCE(chain->blob_next);
2050 kvfree(chain->blob_next);
2053 void nf_tables_chain_destroy(struct nft_ctx *ctx)
2055 struct nft_chain *chain = ctx->chain;
2056 struct nft_hook *hook, *next;
2058 if (WARN_ON(chain->use > 0))
2061 /* no concurrent access possible anymore */
2062 nf_tables_chain_free_chain_rules(chain);
2064 if (nft_is_base_chain(chain)) {
2065 struct nft_base_chain *basechain = nft_base_chain(chain);
2067 if (nft_base_chain_netdev(ctx->family, basechain->ops.hooknum)) {
2068 list_for_each_entry_safe(hook, next,
2069 &basechain->hook_list, list) {
2070 list_del_rcu(&hook->list);
2071 kfree_rcu(hook, rcu);
2074 module_put(basechain->type->owner);
2075 if (rcu_access_pointer(basechain->stats)) {
2076 static_branch_dec(&nft_counters_enabled);
2077 free_percpu(rcu_dereference_raw(basechain->stats));
2080 kfree(chain->udata);
2084 kfree(chain->udata);
2089 static struct nft_hook *nft_netdev_hook_alloc(struct net *net,
2090 const struct nlattr *attr)
2092 struct net_device *dev;
2093 char ifname[IFNAMSIZ];
2094 struct nft_hook *hook;
2097 hook = kzalloc(sizeof(struct nft_hook), GFP_KERNEL_ACCOUNT);
2100 goto err_hook_alloc;
2103 nla_strscpy(ifname, attr, IFNAMSIZ);
2104 /* nf_tables_netdev_event() is called under rtnl_mutex, this is
2105 * indirectly serializing all the other holders of the commit_mutex with
2108 dev = __dev_get_by_name(net, ifname);
2113 hook->ops.dev = dev;
2120 return ERR_PTR(err);
2123 static struct nft_hook *nft_hook_list_find(struct list_head *hook_list,
2124 const struct nft_hook *this)
2126 struct nft_hook *hook;
2128 list_for_each_entry(hook, hook_list, list) {
2129 if (this->ops.dev == hook->ops.dev)
2136 static int nf_tables_parse_netdev_hooks(struct net *net,
2137 const struct nlattr *attr,
2138 struct list_head *hook_list,
2139 struct netlink_ext_ack *extack)
2141 struct nft_hook *hook, *next;
2142 const struct nlattr *tmp;
2143 int rem, n = 0, err;
2145 nla_for_each_nested(tmp, attr, rem) {
2146 if (nla_type(tmp) != NFTA_DEVICE_NAME) {
2151 hook = nft_netdev_hook_alloc(net, tmp);
2153 NL_SET_BAD_ATTR(extack, tmp);
2154 err = PTR_ERR(hook);
2157 if (nft_hook_list_find(hook_list, hook)) {
2158 NL_SET_BAD_ATTR(extack, tmp);
2163 list_add_tail(&hook->list, hook_list);
2166 if (n == NFT_NETDEVICE_MAX) {
2175 list_for_each_entry_safe(hook, next, hook_list, list) {
2176 list_del(&hook->list);
2182 struct nft_chain_hook {
2185 const struct nft_chain_type *type;
2186 struct list_head list;
2189 static int nft_chain_parse_netdev(struct net *net, struct nlattr *tb[],
2190 struct list_head *hook_list,
2191 struct netlink_ext_ack *extack, u32 flags)
2193 struct nft_hook *hook;
2196 if (tb[NFTA_HOOK_DEV]) {
2197 hook = nft_netdev_hook_alloc(net, tb[NFTA_HOOK_DEV]);
2199 NL_SET_BAD_ATTR(extack, tb[NFTA_HOOK_DEV]);
2200 return PTR_ERR(hook);
2203 list_add_tail(&hook->list, hook_list);
2204 } else if (tb[NFTA_HOOK_DEVS]) {
2205 err = nf_tables_parse_netdev_hooks(net, tb[NFTA_HOOK_DEVS],
2212 if (flags & NFT_CHAIN_HW_OFFLOAD &&
2213 list_empty(hook_list))
2219 static int nft_chain_parse_hook(struct net *net,
2220 struct nft_base_chain *basechain,
2221 const struct nlattr * const nla[],
2222 struct nft_chain_hook *hook, u8 family,
2223 u32 flags, struct netlink_ext_ack *extack)
2225 struct nftables_pernet *nft_net = nft_pernet(net);
2226 struct nlattr *ha[NFTA_HOOK_MAX + 1];
2227 const struct nft_chain_type *type;
2230 lockdep_assert_held(&nft_net->commit_mutex);
2231 lockdep_nfnl_nft_mutex_not_held();
2233 err = nla_parse_nested_deprecated(ha, NFTA_HOOK_MAX,
2234 nla[NFTA_CHAIN_HOOK],
2235 nft_hook_policy, NULL);
2240 if (!ha[NFTA_HOOK_HOOKNUM] ||
2241 !ha[NFTA_HOOK_PRIORITY]) {
2242 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2246 hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
2247 hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
2249 type = __nft_chain_type_get(family, NFT_CHAIN_T_DEFAULT);
2253 if (nla[NFTA_CHAIN_TYPE]) {
2254 type = nf_tables_chain_type_lookup(net, nla[NFTA_CHAIN_TYPE],
2257 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
2258 return PTR_ERR(type);
2261 if (hook->num >= NFT_MAX_HOOKS || !(type->hook_mask & (1 << hook->num)))
2264 if (type->type == NFT_CHAIN_T_NAT &&
2265 hook->priority <= NF_IP_PRI_CONNTRACK)
2268 if (ha[NFTA_HOOK_HOOKNUM]) {
2269 hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
2270 if (hook->num != basechain->ops.hooknum)
2273 if (ha[NFTA_HOOK_PRIORITY]) {
2274 hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
2275 if (hook->priority != basechain->ops.priority)
2279 if (nla[NFTA_CHAIN_TYPE]) {
2280 type = __nf_tables_chain_type_lookup(nla[NFTA_CHAIN_TYPE],
2283 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
2287 type = basechain->type;
2291 if (!try_module_get(type->owner)) {
2292 if (nla[NFTA_CHAIN_TYPE])
2293 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
2299 INIT_LIST_HEAD(&hook->list);
2300 if (nft_base_chain_netdev(family, hook->num)) {
2301 err = nft_chain_parse_netdev(net, ha, &hook->list, extack, flags);
2303 module_put(type->owner);
2306 } else if (ha[NFTA_HOOK_DEV] || ha[NFTA_HOOK_DEVS]) {
2307 module_put(type->owner);
2314 static void nft_chain_release_hook(struct nft_chain_hook *hook)
2316 struct nft_hook *h, *next;
2318 list_for_each_entry_safe(h, next, &hook->list, list) {
2322 module_put(hook->type->owner);
2325 static void nft_last_rule(const struct nft_chain *chain, const void *ptr)
2327 struct nft_rule_dp_last *lrule;
2329 BUILD_BUG_ON(offsetof(struct nft_rule_dp_last, end) != 0);
2331 lrule = (struct nft_rule_dp_last *)ptr;
2332 lrule->end.is_last = 1;
2333 lrule->chain = chain;
2334 /* blob size does not include the trailer rule */
2337 static struct nft_rule_blob *nf_tables_chain_alloc_rules(const struct nft_chain *chain,
2340 struct nft_rule_blob *blob;
2345 size += sizeof(struct nft_rule_blob) + sizeof(struct nft_rule_dp_last);
2347 blob = kvmalloc(size, GFP_KERNEL_ACCOUNT);
2352 nft_last_rule(chain, blob->data);
2357 static void nft_basechain_hook_init(struct nf_hook_ops *ops, u8 family,
2358 const struct nft_chain_hook *hook,
2359 struct nft_chain *chain)
2362 ops->hooknum = hook->num;
2363 ops->priority = hook->priority;
2365 ops->hook = hook->type->hooks[ops->hooknum];
2366 ops->hook_ops_type = NF_HOOK_OP_NF_TABLES;
2369 static int nft_basechain_init(struct nft_base_chain *basechain, u8 family,
2370 struct nft_chain_hook *hook, u32 flags)
2372 struct nft_chain *chain;
2375 basechain->type = hook->type;
2376 INIT_LIST_HEAD(&basechain->hook_list);
2377 chain = &basechain->chain;
2379 if (nft_base_chain_netdev(family, hook->num)) {
2380 list_splice_init(&hook->list, &basechain->hook_list);
2381 list_for_each_entry(h, &basechain->hook_list, list)
2382 nft_basechain_hook_init(&h->ops, family, hook, chain);
2384 nft_basechain_hook_init(&basechain->ops, family, hook, chain);
2386 chain->flags |= NFT_CHAIN_BASE | flags;
2387 basechain->policy = NF_ACCEPT;
2388 if (chain->flags & NFT_CHAIN_HW_OFFLOAD &&
2389 !nft_chain_offload_support(basechain)) {
2390 list_splice_init(&basechain->hook_list, &hook->list);
2394 flow_block_init(&basechain->flow_block);
2399 int nft_chain_add(struct nft_table *table, struct nft_chain *chain)
2403 err = rhltable_insert_key(&table->chains_ht, chain->name,
2404 &chain->rhlhead, nft_chain_ht_params);
2408 list_add_tail_rcu(&chain->list, &table->chains);
2413 static u64 chain_id;
2415 static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask,
2416 u8 policy, u32 flags,
2417 struct netlink_ext_ack *extack)
2419 const struct nlattr * const *nla = ctx->nla;
2420 struct nft_table *table = ctx->table;
2421 struct nft_base_chain *basechain;
2422 struct net *net = ctx->net;
2423 char name[NFT_NAME_MAXLEN];
2424 struct nft_rule_blob *blob;
2425 struct nft_trans *trans;
2426 struct nft_chain *chain;
2429 if (nla[NFTA_CHAIN_HOOK]) {
2430 struct nft_stats __percpu *stats = NULL;
2431 struct nft_chain_hook hook = {};
2433 if (flags & NFT_CHAIN_BINDING)
2436 err = nft_chain_parse_hook(net, NULL, nla, &hook, family, flags,
2441 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL_ACCOUNT);
2442 if (basechain == NULL) {
2443 nft_chain_release_hook(&hook);
2446 chain = &basechain->chain;
2448 if (nla[NFTA_CHAIN_COUNTERS]) {
2449 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2450 if (IS_ERR(stats)) {
2451 nft_chain_release_hook(&hook);
2453 return PTR_ERR(stats);
2455 rcu_assign_pointer(basechain->stats, stats);
2458 err = nft_basechain_init(basechain, family, &hook, flags);
2460 nft_chain_release_hook(&hook);
2466 static_branch_inc(&nft_counters_enabled);
2468 if (flags & NFT_CHAIN_BASE)
2470 if (flags & NFT_CHAIN_HW_OFFLOAD)
2473 chain = kzalloc(sizeof(*chain), GFP_KERNEL_ACCOUNT);
2477 chain->flags = flags;
2481 INIT_LIST_HEAD(&chain->rules);
2482 chain->handle = nf_tables_alloc_handle(table);
2483 chain->table = table;
2485 if (nla[NFTA_CHAIN_NAME]) {
2486 chain->name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL_ACCOUNT);
2488 if (!(flags & NFT_CHAIN_BINDING)) {
2490 goto err_destroy_chain;
2493 snprintf(name, sizeof(name), "__chain%llu", ++chain_id);
2494 chain->name = kstrdup(name, GFP_KERNEL_ACCOUNT);
2499 goto err_destroy_chain;
2502 if (nla[NFTA_CHAIN_USERDATA]) {
2503 chain->udata = nla_memdup(nla[NFTA_CHAIN_USERDATA], GFP_KERNEL_ACCOUNT);
2504 if (chain->udata == NULL) {
2506 goto err_destroy_chain;
2508 chain->udlen = nla_len(nla[NFTA_CHAIN_USERDATA]);
2511 blob = nf_tables_chain_alloc_rules(chain, 0);
2514 goto err_destroy_chain;
2517 RCU_INIT_POINTER(chain->blob_gen_0, blob);
2518 RCU_INIT_POINTER(chain->blob_gen_1, blob);
2520 if (!nft_use_inc(&table->use)) {
2522 goto err_destroy_chain;
2525 trans = nft_trans_chain_add(ctx, NFT_MSG_NEWCHAIN);
2526 if (IS_ERR(trans)) {
2527 err = PTR_ERR(trans);
2531 nft_trans_chain_policy(trans) = NFT_CHAIN_POLICY_UNSET;
2532 if (nft_is_base_chain(chain))
2533 nft_trans_chain_policy(trans) = policy;
2535 err = nft_chain_add(table, chain);
2539 /* This must be LAST to ensure no packets are walking over this chain. */
2540 err = nf_tables_register_hook(net, table, chain);
2542 goto err_register_hook;
2547 nft_chain_del(chain);
2549 nft_trans_destroy(trans);
2551 nft_use_dec_restore(&table->use);
2553 nf_tables_chain_destroy(ctx);
2558 static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
2559 u32 flags, const struct nlattr *attr,
2560 struct netlink_ext_ack *extack)
2562 const struct nlattr * const *nla = ctx->nla;
2563 struct nft_base_chain *basechain = NULL;
2564 struct nft_table *table = ctx->table;
2565 struct nft_chain *chain = ctx->chain;
2566 struct nft_chain_hook hook = {};
2567 struct nft_stats *stats = NULL;
2568 struct nft_hook *h, *next;
2569 struct nf_hook_ops *ops;
2570 struct nft_trans *trans;
2571 bool unregister = false;
2574 if (chain->flags ^ flags)
2577 INIT_LIST_HEAD(&hook.list);
2579 if (nla[NFTA_CHAIN_HOOK]) {
2580 if (!nft_is_base_chain(chain)) {
2581 NL_SET_BAD_ATTR(extack, attr);
2585 basechain = nft_base_chain(chain);
2586 err = nft_chain_parse_hook(ctx->net, basechain, nla, &hook,
2587 ctx->family, flags, extack);
2591 if (basechain->type != hook.type) {
2592 nft_chain_release_hook(&hook);
2593 NL_SET_BAD_ATTR(extack, attr);
2597 if (nft_base_chain_netdev(ctx->family, basechain->ops.hooknum)) {
2598 list_for_each_entry_safe(h, next, &hook.list, list) {
2599 h->ops.pf = basechain->ops.pf;
2600 h->ops.hooknum = basechain->ops.hooknum;
2601 h->ops.priority = basechain->ops.priority;
2602 h->ops.priv = basechain->ops.priv;
2603 h->ops.hook = basechain->ops.hook;
2605 if (nft_hook_list_find(&basechain->hook_list, h)) {
2611 ops = &basechain->ops;
2612 if (ops->hooknum != hook.num ||
2613 ops->priority != hook.priority) {
2614 nft_chain_release_hook(&hook);
2615 NL_SET_BAD_ATTR(extack, attr);
2621 if (nla[NFTA_CHAIN_HANDLE] &&
2622 nla[NFTA_CHAIN_NAME]) {
2623 struct nft_chain *chain2;
2625 chain2 = nft_chain_lookup(ctx->net, table,
2626 nla[NFTA_CHAIN_NAME], genmask);
2627 if (!IS_ERR(chain2)) {
2628 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2634 if (nla[NFTA_CHAIN_COUNTERS]) {
2635 if (!nft_is_base_chain(chain)) {
2640 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2641 if (IS_ERR(stats)) {
2642 err = PTR_ERR(stats);
2647 if (!(table->flags & NFT_TABLE_F_DORMANT) &&
2648 nft_is_base_chain(chain) &&
2649 !list_empty(&hook.list)) {
2650 basechain = nft_base_chain(chain);
2651 ops = &basechain->ops;
2653 if (nft_base_chain_netdev(table->family, basechain->ops.hooknum)) {
2654 err = nft_netdev_register_hooks(ctx->net, &hook.list);
2662 trans = nft_trans_alloc(ctx, NFT_MSG_NEWCHAIN,
2663 sizeof(struct nft_trans_chain));
2667 nft_trans_chain_stats(trans) = stats;
2668 nft_trans_chain_update(trans) = true;
2670 if (nla[NFTA_CHAIN_POLICY])
2671 nft_trans_chain_policy(trans) = policy;
2673 nft_trans_chain_policy(trans) = -1;
2675 if (nla[NFTA_CHAIN_HANDLE] &&
2676 nla[NFTA_CHAIN_NAME]) {
2677 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
2678 struct nft_trans *tmp;
2682 name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL_ACCOUNT);
2687 list_for_each_entry(tmp, &nft_net->commit_list, list) {
2688 if (tmp->msg_type == NFT_MSG_NEWCHAIN &&
2689 tmp->ctx.table == table &&
2690 nft_trans_chain_update(tmp) &&
2691 nft_trans_chain_name(tmp) &&
2692 strcmp(name, nft_trans_chain_name(tmp)) == 0) {
2693 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2699 nft_trans_chain_name(trans) = name;
2702 nft_trans_basechain(trans) = basechain;
2703 INIT_LIST_HEAD(&nft_trans_chain_hooks(trans));
2704 list_splice(&hook.list, &nft_trans_chain_hooks(trans));
2705 if (nla[NFTA_CHAIN_HOOK])
2706 module_put(hook.type->owner);
2708 nft_trans_commit_list_add_tail(ctx->net, trans);
2716 if (nla[NFTA_CHAIN_HOOK]) {
2717 list_for_each_entry_safe(h, next, &hook.list, list) {
2719 nf_unregister_net_hook(ctx->net, &h->ops);
2723 module_put(hook.type->owner);
2729 static struct nft_chain *nft_chain_lookup_byid(const struct net *net,
2730 const struct nft_table *table,
2731 const struct nlattr *nla, u8 genmask)
2733 struct nftables_pernet *nft_net = nft_pernet(net);
2734 u32 id = ntohl(nla_get_be32(nla));
2735 struct nft_trans *trans;
2737 list_for_each_entry(trans, &nft_net->commit_list, list) {
2738 struct nft_chain *chain = trans->ctx.chain;
2740 if (trans->msg_type == NFT_MSG_NEWCHAIN &&
2741 chain->table == table &&
2742 id == nft_trans_chain_id(trans) &&
2743 nft_active_genmask(chain, genmask))
2746 return ERR_PTR(-ENOENT);
2749 static int nf_tables_newchain(struct sk_buff *skb, const struct nfnl_info *info,
2750 const struct nlattr * const nla[])
2752 struct nftables_pernet *nft_net = nft_pernet(info->net);
2753 struct netlink_ext_ack *extack = info->extack;
2754 u8 genmask = nft_genmask_next(info->net);
2755 u8 family = info->nfmsg->nfgen_family;
2756 struct nft_chain *chain = NULL;
2757 struct net *net = info->net;
2758 const struct nlattr *attr;
2759 struct nft_table *table;
2760 u8 policy = NF_ACCEPT;
2765 lockdep_assert_held(&nft_net->commit_mutex);
2767 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2768 NETLINK_CB(skb).portid);
2769 if (IS_ERR(table)) {
2770 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2771 return PTR_ERR(table);
2775 attr = nla[NFTA_CHAIN_NAME];
2777 if (nla[NFTA_CHAIN_HANDLE]) {
2778 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
2779 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2780 if (IS_ERR(chain)) {
2781 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_HANDLE]);
2782 return PTR_ERR(chain);
2784 attr = nla[NFTA_CHAIN_HANDLE];
2785 } else if (nla[NFTA_CHAIN_NAME]) {
2786 chain = nft_chain_lookup(net, table, attr, genmask);
2787 if (IS_ERR(chain)) {
2788 if (PTR_ERR(chain) != -ENOENT) {
2789 NL_SET_BAD_ATTR(extack, attr);
2790 return PTR_ERR(chain);
2794 } else if (!nla[NFTA_CHAIN_ID]) {
2798 if (nla[NFTA_CHAIN_POLICY]) {
2799 if (chain != NULL &&
2800 !nft_is_base_chain(chain)) {
2801 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2805 if (chain == NULL &&
2806 nla[NFTA_CHAIN_HOOK] == NULL) {
2807 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2811 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
2821 if (nla[NFTA_CHAIN_FLAGS])
2822 flags = ntohl(nla_get_be32(nla[NFTA_CHAIN_FLAGS]));
2824 flags = chain->flags;
2826 if (flags & ~NFT_CHAIN_FLAGS)
2829 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
2831 if (chain != NULL) {
2832 if (chain->flags & NFT_CHAIN_BINDING)
2835 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
2836 NL_SET_BAD_ATTR(extack, attr);
2839 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
2842 flags |= chain->flags & NFT_CHAIN_BASE;
2843 return nf_tables_updchain(&ctx, genmask, policy, flags, attr,
2847 return nf_tables_addchain(&ctx, family, genmask, policy, flags, extack);
2850 static int nft_delchain_hook(struct nft_ctx *ctx,
2851 struct nft_base_chain *basechain,
2852 struct netlink_ext_ack *extack)
2854 const struct nft_chain *chain = &basechain->chain;
2855 const struct nlattr * const *nla = ctx->nla;
2856 struct nft_chain_hook chain_hook = {};
2857 struct nft_hook *this, *hook;
2858 LIST_HEAD(chain_del_list);
2859 struct nft_trans *trans;
2862 err = nft_chain_parse_hook(ctx->net, basechain, nla, &chain_hook,
2863 ctx->family, chain->flags, extack);
2867 list_for_each_entry(this, &chain_hook.list, list) {
2868 hook = nft_hook_list_find(&basechain->hook_list, this);
2871 goto err_chain_del_hook;
2873 list_move(&hook->list, &chain_del_list);
2876 trans = nft_trans_alloc(ctx, NFT_MSG_DELCHAIN,
2877 sizeof(struct nft_trans_chain));
2880 goto err_chain_del_hook;
2883 nft_trans_basechain(trans) = basechain;
2884 nft_trans_chain_update(trans) = true;
2885 INIT_LIST_HEAD(&nft_trans_chain_hooks(trans));
2886 list_splice(&chain_del_list, &nft_trans_chain_hooks(trans));
2887 nft_chain_release_hook(&chain_hook);
2889 nft_trans_commit_list_add_tail(ctx->net, trans);
2894 list_splice(&chain_del_list, &basechain->hook_list);
2895 nft_chain_release_hook(&chain_hook);
2900 static int nf_tables_delchain(struct sk_buff *skb, const struct nfnl_info *info,
2901 const struct nlattr * const nla[])
2903 struct netlink_ext_ack *extack = info->extack;
2904 u8 genmask = nft_genmask_next(info->net);
2905 u8 family = info->nfmsg->nfgen_family;
2906 struct net *net = info->net;
2907 const struct nlattr *attr;
2908 struct nft_table *table;
2909 struct nft_chain *chain;
2910 struct nft_rule *rule;
2916 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2917 NETLINK_CB(skb).portid);
2918 if (IS_ERR(table)) {
2919 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2920 return PTR_ERR(table);
2923 if (nla[NFTA_CHAIN_HANDLE]) {
2924 attr = nla[NFTA_CHAIN_HANDLE];
2925 handle = be64_to_cpu(nla_get_be64(attr));
2926 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2928 attr = nla[NFTA_CHAIN_NAME];
2929 chain = nft_chain_lookup(net, table, attr, genmask);
2931 if (IS_ERR(chain)) {
2932 if (PTR_ERR(chain) == -ENOENT &&
2933 NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYCHAIN)
2936 NL_SET_BAD_ATTR(extack, attr);
2937 return PTR_ERR(chain);
2940 if (nft_chain_binding(chain))
2943 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
2945 if (nla[NFTA_CHAIN_HOOK]) {
2946 if (chain->flags & NFT_CHAIN_HW_OFFLOAD)
2949 if (nft_is_base_chain(chain)) {
2950 struct nft_base_chain *basechain = nft_base_chain(chain);
2952 if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
2953 return nft_delchain_hook(&ctx, basechain, extack);
2957 if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
2962 list_for_each_entry(rule, &chain->rules, list) {
2963 if (!nft_is_active_next(net, rule))
2967 err = nft_delrule(&ctx, rule);
2972 /* There are rules and elements that are still holding references to us,
2973 * we cannot do a recursive removal in this case.
2976 NL_SET_BAD_ATTR(extack, attr);
2980 return nft_delchain(&ctx);
2988 * nft_register_expr - register nf_tables expr type
2991 * Registers the expr type for use with nf_tables. Returns zero on
2992 * success or a negative errno code otherwise.
2994 int nft_register_expr(struct nft_expr_type *type)
2996 if (WARN_ON_ONCE(type->maxattr > NFT_EXPR_MAXATTR))
2999 nfnl_lock(NFNL_SUBSYS_NFTABLES);
3000 if (type->family == NFPROTO_UNSPEC)
3001 list_add_tail_rcu(&type->list, &nf_tables_expressions);
3003 list_add_rcu(&type->list, &nf_tables_expressions);
3004 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
3007 EXPORT_SYMBOL_GPL(nft_register_expr);
3010 * nft_unregister_expr - unregister nf_tables expr type
3013 * Unregisters the expr typefor use with nf_tables.
3015 void nft_unregister_expr(struct nft_expr_type *type)
3017 nfnl_lock(NFNL_SUBSYS_NFTABLES);
3018 list_del_rcu(&type->list);
3019 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
3021 EXPORT_SYMBOL_GPL(nft_unregister_expr);
3023 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
3026 const struct nft_expr_type *type, *candidate = NULL;
3028 list_for_each_entry(type, &nf_tables_expressions, list) {
3029 if (!nla_strcmp(nla, type->name)) {
3030 if (!type->family && !candidate)
3032 else if (type->family == family)
3039 #ifdef CONFIG_MODULES
3040 static int nft_expr_type_request_module(struct net *net, u8 family,
3043 if (nft_request_module(net, "nft-expr-%u-%.*s", family,
3044 nla_len(nla), (char *)nla_data(nla)) == -EAGAIN)
3051 static const struct nft_expr_type *nft_expr_type_get(struct net *net,
3055 const struct nft_expr_type *type;
3058 return ERR_PTR(-EINVAL);
3060 type = __nft_expr_type_get(family, nla);
3061 if (type != NULL && try_module_get(type->owner))
3064 lockdep_nfnl_nft_mutex_not_held();
3065 #ifdef CONFIG_MODULES
3067 if (nft_expr_type_request_module(net, family, nla) == -EAGAIN)
3068 return ERR_PTR(-EAGAIN);
3070 if (nft_request_module(net, "nft-expr-%.*s",
3072 (char *)nla_data(nla)) == -EAGAIN)
3073 return ERR_PTR(-EAGAIN);
3076 return ERR_PTR(-ENOENT);
3079 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
3080 [NFTA_EXPR_NAME] = { .type = NLA_STRING,
3081 .len = NFT_MODULE_AUTOLOAD_LIMIT },
3082 [NFTA_EXPR_DATA] = { .type = NLA_NESTED },
3085 static int nf_tables_fill_expr_info(struct sk_buff *skb,
3086 const struct nft_expr *expr, bool reset)
3088 if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
3089 goto nla_put_failure;
3091 if (expr->ops->dump) {
3092 struct nlattr *data = nla_nest_start_noflag(skb,
3095 goto nla_put_failure;
3096 if (expr->ops->dump(skb, expr, reset) < 0)
3097 goto nla_put_failure;
3098 nla_nest_end(skb, data);
3107 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
3108 const struct nft_expr *expr, bool reset)
3110 struct nlattr *nest;
3112 nest = nla_nest_start_noflag(skb, attr);
3114 goto nla_put_failure;
3115 if (nf_tables_fill_expr_info(skb, expr, reset) < 0)
3116 goto nla_put_failure;
3117 nla_nest_end(skb, nest);
3124 struct nft_expr_info {
3125 const struct nft_expr_ops *ops;
3126 const struct nlattr *attr;
3127 struct nlattr *tb[NFT_EXPR_MAXATTR + 1];
3130 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
3131 const struct nlattr *nla,
3132 struct nft_expr_info *info)
3134 const struct nft_expr_type *type;
3135 const struct nft_expr_ops *ops;
3136 struct nlattr *tb[NFTA_EXPR_MAX + 1];
3139 err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
3140 nft_expr_policy, NULL);
3144 type = nft_expr_type_get(ctx->net, ctx->family, tb[NFTA_EXPR_NAME]);
3146 return PTR_ERR(type);
3148 if (tb[NFTA_EXPR_DATA]) {
3149 err = nla_parse_nested_deprecated(info->tb, type->maxattr,
3151 type->policy, NULL);
3155 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
3157 if (type->select_ops != NULL) {
3158 ops = type->select_ops(ctx,
3159 (const struct nlattr * const *)info->tb);
3162 #ifdef CONFIG_MODULES
3164 if (nft_expr_type_request_module(ctx->net,
3166 tb[NFTA_EXPR_NAME]) != -EAGAIN)
3180 module_put(type->owner);
3184 int nft_expr_inner_parse(const struct nft_ctx *ctx, const struct nlattr *nla,
3185 struct nft_expr_info *info)
3187 struct nlattr *tb[NFTA_EXPR_MAX + 1];
3188 const struct nft_expr_type *type;
3191 err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
3192 nft_expr_policy, NULL);
3196 if (!tb[NFTA_EXPR_DATA] || !tb[NFTA_EXPR_NAME])
3199 type = __nft_expr_type_get(ctx->family, tb[NFTA_EXPR_NAME]);
3203 if (!type->inner_ops)
3206 err = nla_parse_nested_deprecated(info->tb, type->maxattr,
3208 type->policy, NULL);
3213 info->ops = type->inner_ops;
3221 static int nf_tables_newexpr(const struct nft_ctx *ctx,
3222 const struct nft_expr_info *expr_info,
3223 struct nft_expr *expr)
3225 const struct nft_expr_ops *ops = expr_info->ops;
3230 err = ops->init(ctx, expr, (const struct nlattr **)expr_info->tb);
3241 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
3242 struct nft_expr *expr)
3244 const struct nft_expr_type *type = expr->ops->type;
3246 if (expr->ops->destroy)
3247 expr->ops->destroy(ctx, expr);
3248 module_put(type->owner);
3251 static struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
3252 const struct nlattr *nla)
3254 struct nft_expr_info expr_info;
3255 struct nft_expr *expr;
3256 struct module *owner;
3259 err = nf_tables_expr_parse(ctx, nla, &expr_info);
3261 goto err_expr_parse;
3264 if (!(expr_info.ops->type->flags & NFT_EXPR_STATEFUL))
3265 goto err_expr_stateful;
3268 expr = kzalloc(expr_info.ops->size, GFP_KERNEL_ACCOUNT);
3270 goto err_expr_stateful;
3272 err = nf_tables_newexpr(ctx, &expr_info, expr);
3280 owner = expr_info.ops->type->owner;
3281 if (expr_info.ops->type->release_ops)
3282 expr_info.ops->type->release_ops(expr_info.ops);
3286 return ERR_PTR(err);
3289 int nft_expr_clone(struct nft_expr *dst, struct nft_expr *src)
3293 if (WARN_ON_ONCE(!src->ops->clone))
3296 dst->ops = src->ops;
3297 err = src->ops->clone(dst, src);
3301 __module_get(src->ops->type->owner);
3306 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
3308 nf_tables_expr_destroy(ctx, expr);
3316 static struct nft_rule *__nft_rule_lookup(const struct nft_chain *chain,
3319 struct nft_rule *rule;
3321 // FIXME: this sucks
3322 list_for_each_entry_rcu(rule, &chain->rules, list) {
3323 if (handle == rule->handle)
3327 return ERR_PTR(-ENOENT);
3330 static struct nft_rule *nft_rule_lookup(const struct nft_chain *chain,
3331 const struct nlattr *nla)
3334 return ERR_PTR(-EINVAL);
3336 return __nft_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
3339 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
3340 [NFTA_RULE_TABLE] = { .type = NLA_STRING,
3341 .len = NFT_TABLE_MAXNAMELEN - 1 },
3342 [NFTA_RULE_CHAIN] = { .type = NLA_STRING,
3343 .len = NFT_CHAIN_MAXNAMELEN - 1 },
3344 [NFTA_RULE_HANDLE] = { .type = NLA_U64 },
3345 [NFTA_RULE_EXPRESSIONS] = NLA_POLICY_NESTED_ARRAY(nft_expr_policy),
3346 [NFTA_RULE_COMPAT] = { .type = NLA_NESTED },
3347 [NFTA_RULE_POSITION] = { .type = NLA_U64 },
3348 [NFTA_RULE_USERDATA] = { .type = NLA_BINARY,
3349 .len = NFT_USERDATA_MAXLEN },
3350 [NFTA_RULE_ID] = { .type = NLA_U32 },
3351 [NFTA_RULE_POSITION_ID] = { .type = NLA_U32 },
3352 [NFTA_RULE_CHAIN_ID] = { .type = NLA_U32 },
3355 static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
3356 u32 portid, u32 seq, int event,
3357 u32 flags, int family,
3358 const struct nft_table *table,
3359 const struct nft_chain *chain,
3360 const struct nft_rule *rule, u64 handle,
3363 struct nlmsghdr *nlh;
3364 const struct nft_expr *expr, *next;
3365 struct nlattr *list;
3366 u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
3368 nlh = nfnl_msg_put(skb, portid, seq, type, flags, family, NFNETLINK_V0,
3371 goto nla_put_failure;
3373 if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
3374 goto nla_put_failure;
3375 if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
3376 goto nla_put_failure;
3377 if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
3379 goto nla_put_failure;
3381 if (event != NFT_MSG_DELRULE && handle) {
3382 if (nla_put_be64(skb, NFTA_RULE_POSITION, cpu_to_be64(handle),
3384 goto nla_put_failure;
3387 if (chain->flags & NFT_CHAIN_HW_OFFLOAD)
3388 nft_flow_rule_stats(chain, rule);
3390 list = nla_nest_start_noflag(skb, NFTA_RULE_EXPRESSIONS);
3392 goto nla_put_failure;
3393 nft_rule_for_each_expr(expr, next, rule) {
3394 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr, reset) < 0)
3395 goto nla_put_failure;
3397 nla_nest_end(skb, list);
3400 struct nft_userdata *udata = nft_userdata(rule);
3401 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
3403 goto nla_put_failure;
3406 nlmsg_end(skb, nlh);
3410 nlmsg_trim(skb, nlh);
3414 static void nf_tables_rule_notify(const struct nft_ctx *ctx,
3415 const struct nft_rule *rule, int event)
3417 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
3418 const struct nft_rule *prule;
3419 struct sk_buff *skb;
3425 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
3428 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3432 if (event == NFT_MSG_NEWRULE &&
3433 !list_is_first(&rule->list, &ctx->chain->rules) &&
3434 !list_is_last(&rule->list, &ctx->chain->rules)) {
3435 prule = list_prev_entry(rule, list);
3436 handle = prule->handle;
3438 if (ctx->flags & (NLM_F_APPEND | NLM_F_REPLACE))
3439 flags |= NLM_F_APPEND;
3440 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
3441 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
3443 err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
3444 event, flags, ctx->family, ctx->table,
3445 ctx->chain, rule, handle, false);
3451 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
3454 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
3457 static void audit_log_rule_reset(const struct nft_table *table,
3458 unsigned int base_seq,
3459 unsigned int nentries)
3461 char *buf = kasprintf(GFP_ATOMIC, "%s:%u",
3462 table->name, base_seq);
3464 audit_log_nfcfg(buf, table->family, nentries,
3465 AUDIT_NFT_OP_RULE_RESET, GFP_ATOMIC);
3469 struct nft_rule_dump_ctx {
3476 static int __nf_tables_dump_rules(struct sk_buff *skb,
3478 struct netlink_callback *cb,
3479 const struct nft_table *table,
3480 const struct nft_chain *chain)
3482 struct nft_rule_dump_ctx *ctx = (void *)cb->ctx;
3483 struct net *net = sock_net(skb->sk);
3484 const struct nft_rule *rule, *prule;
3485 unsigned int entries = 0;
3490 list_for_each_entry_rcu(rule, &chain->rules, list) {
3491 if (!nft_is_active(net, rule))
3493 if (*idx < ctx->s_idx)
3496 handle = prule->handle;
3500 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
3503 NLM_F_MULTI | NLM_F_APPEND,
3505 table, chain, rule, handle, ctx->reset) < 0) {
3510 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3517 if (ctx->reset && entries)
3518 audit_log_rule_reset(table, cb->seq, entries);
3523 static int nf_tables_dump_rules(struct sk_buff *skb,
3524 struct netlink_callback *cb)
3526 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
3527 struct nft_rule_dump_ctx *ctx = (void *)cb->ctx;
3528 struct nft_table *table;
3529 const struct nft_chain *chain;
3530 unsigned int idx = 0;
3531 struct net *net = sock_net(skb->sk);
3532 int family = nfmsg->nfgen_family;
3533 struct nftables_pernet *nft_net;
3536 nft_net = nft_pernet(net);
3537 cb->seq = READ_ONCE(nft_net->base_seq);
3539 list_for_each_entry_rcu(table, &nft_net->tables, list) {
3540 if (family != NFPROTO_UNSPEC && family != table->family)
3543 if (ctx->table && strcmp(ctx->table, table->name) != 0)
3546 if (ctx->table && ctx->chain) {
3547 struct rhlist_head *list, *tmp;
3549 list = rhltable_lookup(&table->chains_ht, ctx->chain,
3550 nft_chain_ht_params);
3554 rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
3555 if (!nft_is_active(net, chain))
3557 __nf_tables_dump_rules(skb, &idx,
3564 list_for_each_entry_rcu(chain, &table->chains, list) {
3565 if (__nf_tables_dump_rules(skb, &idx,
3580 static int nf_tables_dumpreset_rules(struct sk_buff *skb,
3581 struct netlink_callback *cb)
3583 struct nftables_pernet *nft_net = nft_pernet(sock_net(skb->sk));
3586 /* Mutex is held is to prevent that two concurrent dump-and-reset calls
3587 * do not underrun counters and quotas. The commit_mutex is used for
3588 * the lack a better lock, this is not transaction path.
3590 mutex_lock(&nft_net->commit_mutex);
3591 ret = nf_tables_dump_rules(skb, cb);
3592 mutex_unlock(&nft_net->commit_mutex);
3597 static int nf_tables_dump_rules_start(struct netlink_callback *cb)
3599 struct nft_rule_dump_ctx *ctx = (void *)cb->ctx;
3600 const struct nlattr * const *nla = cb->data;
3602 BUILD_BUG_ON(sizeof(*ctx) > sizeof(cb->ctx));
3604 if (nla[NFTA_RULE_TABLE]) {
3605 ctx->table = nla_strdup(nla[NFTA_RULE_TABLE], GFP_ATOMIC);
3609 if (nla[NFTA_RULE_CHAIN]) {
3610 ctx->chain = nla_strdup(nla[NFTA_RULE_CHAIN], GFP_ATOMIC);
3619 static int nf_tables_dumpreset_rules_start(struct netlink_callback *cb)
3621 struct nft_rule_dump_ctx *ctx = (void *)cb->ctx;
3625 return nf_tables_dump_rules_start(cb);
3628 static int nf_tables_dump_rules_done(struct netlink_callback *cb)
3630 struct nft_rule_dump_ctx *ctx = (void *)cb->ctx;
3637 /* called with rcu_read_lock held */
3638 static struct sk_buff *
3639 nf_tables_getrule_single(u32 portid, const struct nfnl_info *info,
3640 const struct nlattr * const nla[], bool reset)
3642 struct netlink_ext_ack *extack = info->extack;
3643 u8 genmask = nft_genmask_cur(info->net);
3644 u8 family = info->nfmsg->nfgen_family;
3645 const struct nft_chain *chain;
3646 const struct nft_rule *rule;
3647 struct net *net = info->net;
3648 struct nft_table *table;
3649 struct sk_buff *skb2;
3652 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask, 0);
3653 if (IS_ERR(table)) {
3654 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3655 return ERR_CAST(table);
3658 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask);
3659 if (IS_ERR(chain)) {
3660 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3661 return ERR_CAST(chain);
3664 rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
3666 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3667 return ERR_CAST(rule);
3670 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
3672 return ERR_PTR(-ENOMEM);
3674 err = nf_tables_fill_rule_info(skb2, net, portid,
3675 info->nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
3676 family, table, chain, rule, 0, reset);
3679 return ERR_PTR(err);
3685 static int nf_tables_getrule(struct sk_buff *skb, const struct nfnl_info *info,
3686 const struct nlattr * const nla[])
3688 u32 portid = NETLINK_CB(skb).portid;
3689 struct net *net = info->net;
3690 struct sk_buff *skb2;
3692 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
3693 struct netlink_dump_control c = {
3694 .start= nf_tables_dump_rules_start,
3695 .dump = nf_tables_dump_rules,
3696 .done = nf_tables_dump_rules_done,
3697 .module = THIS_MODULE,
3698 .data = (void *)nla,
3701 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
3704 skb2 = nf_tables_getrule_single(portid, info, nla, false);
3706 return PTR_ERR(skb2);
3708 return nfnetlink_unicast(skb2, net, portid);
3711 static int nf_tables_getrule_reset(struct sk_buff *skb,
3712 const struct nfnl_info *info,
3713 const struct nlattr * const nla[])
3715 struct nftables_pernet *nft_net = nft_pernet(info->net);
3716 u32 portid = NETLINK_CB(skb).portid;
3717 struct net *net = info->net;
3718 struct sk_buff *skb2;
3721 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
3722 struct netlink_dump_control c = {
3723 .start= nf_tables_dumpreset_rules_start,
3724 .dump = nf_tables_dumpreset_rules,
3725 .done = nf_tables_dump_rules_done,
3726 .module = THIS_MODULE,
3727 .data = (void *)nla,
3730 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
3733 if (!try_module_get(THIS_MODULE))
3736 mutex_lock(&nft_net->commit_mutex);
3737 skb2 = nf_tables_getrule_single(portid, info, nla, true);
3738 mutex_unlock(&nft_net->commit_mutex);
3740 module_put(THIS_MODULE);
3743 return PTR_ERR(skb2);
3745 buf = kasprintf(GFP_ATOMIC, "%.*s:%u",
3746 nla_len(nla[NFTA_RULE_TABLE]),
3747 (char *)nla_data(nla[NFTA_RULE_TABLE]),
3749 audit_log_nfcfg(buf, info->nfmsg->nfgen_family, 1,
3750 AUDIT_NFT_OP_RULE_RESET, GFP_ATOMIC);
3753 return nfnetlink_unicast(skb2, net, portid);
3756 void nf_tables_rule_destroy(const struct nft_ctx *ctx, struct nft_rule *rule)
3758 struct nft_expr *expr, *next;
3761 * Careful: some expressions might not be initialized in case this
3762 * is called on error from nf_tables_newrule().
3764 expr = nft_expr_first(rule);
3765 while (nft_expr_more(rule, expr)) {
3766 next = nft_expr_next(expr);
3767 nf_tables_expr_destroy(ctx, expr);
3773 static void nf_tables_rule_release(const struct nft_ctx *ctx, struct nft_rule *rule)
3775 nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_RELEASE);
3776 nf_tables_rule_destroy(ctx, rule);
3779 int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain)
3781 struct nft_expr *expr, *last;
3782 const struct nft_data *data;
3783 struct nft_rule *rule;
3786 if (ctx->level == NFT_JUMP_STACK_SIZE)
3789 list_for_each_entry(rule, &chain->rules, list) {
3790 if (fatal_signal_pending(current))
3793 if (!nft_is_active_next(ctx->net, rule))
3796 nft_rule_for_each_expr(expr, last, rule) {
3797 if (!expr->ops->validate)
3800 err = expr->ops->validate(ctx, expr, &data);
3808 EXPORT_SYMBOL_GPL(nft_chain_validate);
3810 static int nft_table_validate(struct net *net, const struct nft_table *table)
3812 struct nft_chain *chain;
3813 struct nft_ctx ctx = {
3815 .family = table->family,
3819 list_for_each_entry(chain, &table->chains, list) {
3820 if (!nft_is_base_chain(chain))
3824 err = nft_chain_validate(&ctx, chain);
3834 int nft_setelem_validate(const struct nft_ctx *ctx, struct nft_set *set,
3835 const struct nft_set_iter *iter,
3836 struct nft_elem_priv *elem_priv)
3838 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem_priv);
3839 struct nft_ctx *pctx = (struct nft_ctx *)ctx;
3840 const struct nft_data *data;
3843 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
3844 *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
3847 data = nft_set_ext_data(ext);
3848 switch (data->verdict.code) {
3852 err = nft_chain_validate(ctx, data->verdict.chain);
3864 int nft_set_catchall_validate(const struct nft_ctx *ctx, struct nft_set *set)
3866 u8 genmask = nft_genmask_next(ctx->net);
3867 struct nft_set_elem_catchall *catchall;
3868 struct nft_set_ext *ext;
3871 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
3872 ext = nft_set_elem_ext(set, catchall->elem);
3873 if (!nft_set_elem_active(ext, genmask))
3876 ret = nft_setelem_validate(ctx, set, NULL, catchall->elem);
3884 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3885 const struct nft_chain *chain,
3886 const struct nlattr *nla);
3888 #define NFT_RULE_MAXEXPRS 128
3890 static int nf_tables_newrule(struct sk_buff *skb, const struct nfnl_info *info,
3891 const struct nlattr * const nla[])
3893 struct nftables_pernet *nft_net = nft_pernet(info->net);
3894 struct netlink_ext_ack *extack = info->extack;
3895 unsigned int size, i, n, ulen = 0, usize = 0;
3896 u8 genmask = nft_genmask_next(info->net);
3897 struct nft_rule *rule, *old_rule = NULL;
3898 struct nft_expr_info *expr_info = NULL;
3899 u8 family = info->nfmsg->nfgen_family;
3900 struct nft_flow_rule *flow = NULL;
3901 struct net *net = info->net;
3902 struct nft_userdata *udata;
3903 struct nft_table *table;
3904 struct nft_chain *chain;
3905 struct nft_trans *trans;
3906 u64 handle, pos_handle;
3907 struct nft_expr *expr;
3912 lockdep_assert_held(&nft_net->commit_mutex);
3914 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
3915 NETLINK_CB(skb).portid);
3916 if (IS_ERR(table)) {
3917 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3918 return PTR_ERR(table);
3921 if (nla[NFTA_RULE_CHAIN]) {
3922 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3924 if (IS_ERR(chain)) {
3925 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3926 return PTR_ERR(chain);
3929 } else if (nla[NFTA_RULE_CHAIN_ID]) {
3930 chain = nft_chain_lookup_byid(net, table, nla[NFTA_RULE_CHAIN_ID],
3932 if (IS_ERR(chain)) {
3933 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN_ID]);
3934 return PTR_ERR(chain);
3940 if (nft_chain_is_bound(chain))
3943 if (nla[NFTA_RULE_HANDLE]) {
3944 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
3945 rule = __nft_rule_lookup(chain, handle);
3947 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3948 return PTR_ERR(rule);
3951 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
3952 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3955 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
3960 if (!(info->nlh->nlmsg_flags & NLM_F_CREATE) ||
3961 info->nlh->nlmsg_flags & NLM_F_REPLACE)
3963 handle = nf_tables_alloc_handle(table);
3965 if (nla[NFTA_RULE_POSITION]) {
3966 pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
3967 old_rule = __nft_rule_lookup(chain, pos_handle);
3968 if (IS_ERR(old_rule)) {
3969 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION]);
3970 return PTR_ERR(old_rule);
3972 } else if (nla[NFTA_RULE_POSITION_ID]) {
3973 old_rule = nft_rule_lookup_byid(net, chain, nla[NFTA_RULE_POSITION_ID]);
3974 if (IS_ERR(old_rule)) {
3975 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION_ID]);
3976 return PTR_ERR(old_rule);
3981 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
3985 if (nla[NFTA_RULE_EXPRESSIONS]) {
3986 expr_info = kvmalloc_array(NFT_RULE_MAXEXPRS,
3987 sizeof(struct nft_expr_info),
3992 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
3994 if (nla_type(tmp) != NFTA_LIST_ELEM)
3995 goto err_release_expr;
3996 if (n == NFT_RULE_MAXEXPRS)
3997 goto err_release_expr;
3998 err = nf_tables_expr_parse(&ctx, tmp, &expr_info[n]);
4000 NL_SET_BAD_ATTR(extack, tmp);
4001 goto err_release_expr;
4003 size += expr_info[n].ops->size;
4007 /* Check for overflow of dlen field */
4009 if (size >= 1 << 12)
4010 goto err_release_expr;
4012 if (nla[NFTA_RULE_USERDATA]) {
4013 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
4015 usize = sizeof(struct nft_userdata) + ulen;
4019 rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL_ACCOUNT);
4021 goto err_release_expr;
4023 nft_activate_next(net, rule);
4025 rule->handle = handle;
4027 rule->udata = ulen ? 1 : 0;
4030 udata = nft_userdata(rule);
4031 udata->len = ulen - 1;
4032 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
4035 expr = nft_expr_first(rule);
4036 for (i = 0; i < n; i++) {
4037 err = nf_tables_newexpr(&ctx, &expr_info[i], expr);
4039 NL_SET_BAD_ATTR(extack, expr_info[i].attr);
4040 goto err_release_rule;
4043 if (expr_info[i].ops->validate)
4044 nft_validate_state_update(table, NFT_VALIDATE_NEED);
4046 expr_info[i].ops = NULL;
4047 expr = nft_expr_next(expr);
4050 if (chain->flags & NFT_CHAIN_HW_OFFLOAD) {
4051 flow = nft_flow_rule_create(net, rule);
4053 err = PTR_ERR(flow);
4054 goto err_release_rule;
4058 if (!nft_use_inc(&chain->use)) {
4060 goto err_release_rule;
4063 if (info->nlh->nlmsg_flags & NLM_F_REPLACE) {
4064 if (nft_chain_binding(chain)) {
4066 goto err_destroy_flow_rule;
4069 err = nft_delrule(&ctx, old_rule);
4071 goto err_destroy_flow_rule;
4073 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
4074 if (trans == NULL) {
4076 goto err_destroy_flow_rule;
4078 list_add_tail_rcu(&rule->list, &old_rule->list);
4080 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
4083 goto err_destroy_flow_rule;
4086 if (info->nlh->nlmsg_flags & NLM_F_APPEND) {
4088 list_add_rcu(&rule->list, &old_rule->list);
4090 list_add_tail_rcu(&rule->list, &chain->rules);
4093 list_add_tail_rcu(&rule->list, &old_rule->list);
4095 list_add_rcu(&rule->list, &chain->rules);
4101 nft_trans_flow_rule(trans) = flow;
4103 if (table->validate_state == NFT_VALIDATE_DO)
4104 return nft_table_validate(net, table);
4108 err_destroy_flow_rule:
4109 nft_use_dec_restore(&chain->use);
4111 nft_flow_rule_destroy(flow);
4113 nft_rule_expr_deactivate(&ctx, rule, NFT_TRANS_PREPARE_ERROR);
4114 nf_tables_rule_destroy(&ctx, rule);
4116 for (i = 0; i < n; i++) {
4117 if (expr_info[i].ops) {
4118 module_put(expr_info[i].ops->type->owner);
4119 if (expr_info[i].ops->type->release_ops)
4120 expr_info[i].ops->type->release_ops(expr_info[i].ops);
4128 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
4129 const struct nft_chain *chain,
4130 const struct nlattr *nla)
4132 struct nftables_pernet *nft_net = nft_pernet(net);
4133 u32 id = ntohl(nla_get_be32(nla));
4134 struct nft_trans *trans;
4136 list_for_each_entry(trans, &nft_net->commit_list, list) {
4137 if (trans->msg_type == NFT_MSG_NEWRULE &&
4138 trans->ctx.chain == chain &&
4139 id == nft_trans_rule_id(trans))
4140 return nft_trans_rule(trans);
4142 return ERR_PTR(-ENOENT);
4145 static int nf_tables_delrule(struct sk_buff *skb, const struct nfnl_info *info,
4146 const struct nlattr * const nla[])
4148 struct netlink_ext_ack *extack = info->extack;
4149 u8 genmask = nft_genmask_next(info->net);
4150 u8 family = info->nfmsg->nfgen_family;
4151 struct nft_chain *chain = NULL;
4152 struct net *net = info->net;
4153 struct nft_table *table;
4154 struct nft_rule *rule;
4158 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
4159 NETLINK_CB(skb).portid);
4160 if (IS_ERR(table)) {
4161 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
4162 return PTR_ERR(table);
4165 if (nla[NFTA_RULE_CHAIN]) {
4166 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
4168 if (IS_ERR(chain)) {
4169 if (PTR_ERR(chain) == -ENOENT &&
4170 NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYRULE)
4173 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
4174 return PTR_ERR(chain);
4176 if (nft_chain_binding(chain))
4180 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
4183 if (nla[NFTA_RULE_HANDLE]) {
4184 rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
4186 if (PTR_ERR(rule) == -ENOENT &&
4187 NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYRULE)
4190 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
4191 return PTR_ERR(rule);
4194 err = nft_delrule(&ctx, rule);
4195 } else if (nla[NFTA_RULE_ID]) {
4196 rule = nft_rule_lookup_byid(net, chain, nla[NFTA_RULE_ID]);
4198 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_ID]);
4199 return PTR_ERR(rule);
4202 err = nft_delrule(&ctx, rule);
4204 err = nft_delrule_by_chain(&ctx);
4207 list_for_each_entry(chain, &table->chains, list) {
4208 if (!nft_is_active_next(net, chain))
4210 if (nft_chain_binding(chain))
4214 err = nft_delrule_by_chain(&ctx);
4226 static const struct nft_set_type *nft_set_types[] = {
4227 &nft_set_hash_fast_type,
4229 &nft_set_rhash_type,
4230 &nft_set_bitmap_type,
4231 &nft_set_rbtree_type,
4232 #if defined(CONFIG_X86_64) && !defined(CONFIG_UML)
4233 &nft_set_pipapo_avx2_type,
4235 &nft_set_pipapo_type,
4238 #define NFT_SET_FEATURES (NFT_SET_INTERVAL | NFT_SET_MAP | \
4239 NFT_SET_TIMEOUT | NFT_SET_OBJECT | \
4242 static bool nft_set_ops_candidate(const struct nft_set_type *type, u32 flags)
4244 return (flags & type->features) == (flags & NFT_SET_FEATURES);
4248 * Select a set implementation based on the data characteristics and the
4249 * given policy. The total memory use might not be known if no size is
4250 * given, in that case the amount of memory per element is used.
4252 static const struct nft_set_ops *
4253 nft_select_set_ops(const struct nft_ctx *ctx, u32 flags,
4254 const struct nft_set_desc *desc)
4256 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
4257 const struct nft_set_ops *ops, *bops;
4258 struct nft_set_estimate est, best;
4259 const struct nft_set_type *type;
4262 lockdep_assert_held(&nft_net->commit_mutex);
4263 lockdep_nfnl_nft_mutex_not_held();
4270 for (i = 0; i < ARRAY_SIZE(nft_set_types); i++) {
4271 type = nft_set_types[i];
4274 if (!nft_set_ops_candidate(type, flags))
4276 if (!ops->estimate(desc, flags, &est))
4279 switch (desc->policy) {
4280 case NFT_SET_POL_PERFORMANCE:
4281 if (est.lookup < best.lookup)
4283 if (est.lookup == best.lookup &&
4284 est.space < best.space)
4287 case NFT_SET_POL_MEMORY:
4289 if (est.space < best.space)
4291 if (est.space == best.space &&
4292 est.lookup < best.lookup)
4294 } else if (est.size < best.size || !bops) {
4309 return ERR_PTR(-EOPNOTSUPP);
4312 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
4313 [NFTA_SET_TABLE] = { .type = NLA_STRING,
4314 .len = NFT_TABLE_MAXNAMELEN - 1 },
4315 [NFTA_SET_NAME] = { .type = NLA_STRING,
4316 .len = NFT_SET_MAXNAMELEN - 1 },
4317 [NFTA_SET_FLAGS] = { .type = NLA_U32 },
4318 [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 },
4319 [NFTA_SET_KEY_LEN] = { .type = NLA_U32 },
4320 [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 },
4321 [NFTA_SET_DATA_LEN] = { .type = NLA_U32 },
4322 [NFTA_SET_POLICY] = { .type = NLA_U32 },
4323 [NFTA_SET_DESC] = { .type = NLA_NESTED },
4324 [NFTA_SET_ID] = { .type = NLA_U32 },
4325 [NFTA_SET_TIMEOUT] = { .type = NLA_U64 },
4326 [NFTA_SET_GC_INTERVAL] = { .type = NLA_U32 },
4327 [NFTA_SET_USERDATA] = { .type = NLA_BINARY,
4328 .len = NFT_USERDATA_MAXLEN },
4329 [NFTA_SET_OBJ_TYPE] = { .type = NLA_U32 },
4330 [NFTA_SET_HANDLE] = { .type = NLA_U64 },
4331 [NFTA_SET_EXPR] = { .type = NLA_NESTED },
4332 [NFTA_SET_EXPRESSIONS] = NLA_POLICY_NESTED_ARRAY(nft_expr_policy),
4335 static const struct nla_policy nft_concat_policy[NFTA_SET_FIELD_MAX + 1] = {
4336 [NFTA_SET_FIELD_LEN] = { .type = NLA_U32 },
4339 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
4340 [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 },
4341 [NFTA_SET_DESC_CONCAT] = NLA_POLICY_NESTED_ARRAY(nft_concat_policy),
4344 static struct nft_set *nft_set_lookup(const struct nft_table *table,
4345 const struct nlattr *nla, u8 genmask)
4347 struct nft_set *set;
4350 return ERR_PTR(-EINVAL);
4352 list_for_each_entry_rcu(set, &table->sets, list) {
4353 if (!nla_strcmp(nla, set->name) &&
4354 nft_active_genmask(set, genmask))
4357 return ERR_PTR(-ENOENT);
4360 static struct nft_set *nft_set_lookup_byhandle(const struct nft_table *table,
4361 const struct nlattr *nla,
4364 struct nft_set *set;
4366 list_for_each_entry(set, &table->sets, list) {
4367 if (be64_to_cpu(nla_get_be64(nla)) == set->handle &&
4368 nft_active_genmask(set, genmask))
4371 return ERR_PTR(-ENOENT);
4374 static struct nft_set *nft_set_lookup_byid(const struct net *net,
4375 const struct nft_table *table,
4376 const struct nlattr *nla, u8 genmask)
4378 struct nftables_pernet *nft_net = nft_pernet(net);
4379 u32 id = ntohl(nla_get_be32(nla));
4380 struct nft_trans *trans;
4382 list_for_each_entry(trans, &nft_net->commit_list, list) {
4383 if (trans->msg_type == NFT_MSG_NEWSET) {
4384 struct nft_set *set = nft_trans_set(trans);
4386 if (id == nft_trans_set_id(trans) &&
4387 set->table == table &&
4388 nft_active_genmask(set, genmask))
4392 return ERR_PTR(-ENOENT);
4395 struct nft_set *nft_set_lookup_global(const struct net *net,
4396 const struct nft_table *table,
4397 const struct nlattr *nla_set_name,
4398 const struct nlattr *nla_set_id,
4401 struct nft_set *set;
4403 set = nft_set_lookup(table, nla_set_name, genmask);
4408 set = nft_set_lookup_byid(net, table, nla_set_id, genmask);
4412 EXPORT_SYMBOL_GPL(nft_set_lookup_global);
4414 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
4417 const struct nft_set *i;
4419 unsigned long *inuse;
4420 unsigned int n = 0, min = 0;
4422 p = strchr(name, '%');
4424 if (p[1] != 'd' || strchr(p + 2, '%'))
4427 if (strnlen(name, NFT_SET_MAX_ANONLEN) >= NFT_SET_MAX_ANONLEN)
4430 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
4434 list_for_each_entry(i, &ctx->table->sets, list) {
4437 if (!nft_is_active_next(ctx->net, i))
4439 if (!sscanf(i->name, name, &tmp))
4441 if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
4444 set_bit(tmp - min, inuse);
4447 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
4448 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
4449 min += BITS_PER_BYTE * PAGE_SIZE;
4450 memset(inuse, 0, PAGE_SIZE);
4453 free_page((unsigned long)inuse);
4456 set->name = kasprintf(GFP_KERNEL_ACCOUNT, name, min + n);
4460 list_for_each_entry(i, &ctx->table->sets, list) {
4461 if (!nft_is_active_next(ctx->net, i))
4463 if (!strcmp(set->name, i->name)) {
4472 int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result)
4474 u64 ms = be64_to_cpu(nla_get_be64(nla));
4475 u64 max = (u64)(~((u64)0));
4477 max = div_u64(max, NSEC_PER_MSEC);
4481 ms *= NSEC_PER_MSEC;
4482 *result = nsecs_to_jiffies64(ms);
4486 __be64 nf_jiffies64_to_msecs(u64 input)
4488 return cpu_to_be64(jiffies64_to_msecs(input));
4491 static int nf_tables_fill_set_concat(struct sk_buff *skb,
4492 const struct nft_set *set)
4494 struct nlattr *concat, *field;
4497 concat = nla_nest_start_noflag(skb, NFTA_SET_DESC_CONCAT);
4501 for (i = 0; i < set->field_count; i++) {
4502 field = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
4506 if (nla_put_be32(skb, NFTA_SET_FIELD_LEN,
4507 htonl(set->field_len[i])))
4510 nla_nest_end(skb, field);
4513 nla_nest_end(skb, concat);
4518 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
4519 const struct nft_set *set, u16 event, u16 flags)
4521 u64 timeout = READ_ONCE(set->timeout);
4522 u32 gc_int = READ_ONCE(set->gc_int);
4523 u32 portid = ctx->portid;
4524 struct nlmsghdr *nlh;
4525 struct nlattr *nest;
4529 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
4530 nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
4531 NFNETLINK_V0, nft_base_seq(ctx->net));
4533 goto nla_put_failure;
4535 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
4536 goto nla_put_failure;
4537 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
4538 goto nla_put_failure;
4539 if (nla_put_be64(skb, NFTA_SET_HANDLE, cpu_to_be64(set->handle),
4541 goto nla_put_failure;
4543 if (event == NFT_MSG_DELSET) {
4544 nlmsg_end(skb, nlh);
4548 if (set->flags != 0)
4549 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
4550 goto nla_put_failure;
4552 if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
4553 goto nla_put_failure;
4554 if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
4555 goto nla_put_failure;
4556 if (set->flags & NFT_SET_MAP) {
4557 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
4558 goto nla_put_failure;
4559 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
4560 goto nla_put_failure;
4562 if (set->flags & NFT_SET_OBJECT &&
4563 nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
4564 goto nla_put_failure;
4567 nla_put_be64(skb, NFTA_SET_TIMEOUT,
4568 nf_jiffies64_to_msecs(timeout),
4570 goto nla_put_failure;
4572 nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(gc_int)))
4573 goto nla_put_failure;
4575 if (set->policy != NFT_SET_POL_PERFORMANCE) {
4576 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
4577 goto nla_put_failure;
4581 nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
4582 goto nla_put_failure;
4584 nest = nla_nest_start_noflag(skb, NFTA_SET_DESC);
4586 goto nla_put_failure;
4588 nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
4589 goto nla_put_failure;
4591 if (set->field_count > 1 &&
4592 nf_tables_fill_set_concat(skb, set))
4593 goto nla_put_failure;
4595 nla_nest_end(skb, nest);
4597 if (set->num_exprs == 1) {
4598 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPR);
4599 if (nf_tables_fill_expr_info(skb, set->exprs[0], false) < 0)
4600 goto nla_put_failure;
4602 nla_nest_end(skb, nest);
4603 } else if (set->num_exprs > 1) {
4604 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPRESSIONS);
4606 goto nla_put_failure;
4608 for (i = 0; i < set->num_exprs; i++) {
4609 if (nft_expr_dump(skb, NFTA_LIST_ELEM,
4610 set->exprs[i], false) < 0)
4611 goto nla_put_failure;
4613 nla_nest_end(skb, nest);
4616 nlmsg_end(skb, nlh);
4620 nlmsg_trim(skb, nlh);
4624 static void nf_tables_set_notify(const struct nft_ctx *ctx,
4625 const struct nft_set *set, int event,
4628 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
4629 u32 portid = ctx->portid;
4630 struct sk_buff *skb;
4635 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
4638 skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
4642 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
4643 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
4645 err = nf_tables_fill_set(skb, ctx, set, event, flags);
4651 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
4654 nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
4657 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
4659 const struct nft_set *set;
4660 unsigned int idx, s_idx = cb->args[0];
4661 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
4662 struct net *net = sock_net(skb->sk);
4663 struct nft_ctx *ctx = cb->data, ctx_set;
4664 struct nftables_pernet *nft_net;
4670 nft_net = nft_pernet(net);
4671 cb->seq = READ_ONCE(nft_net->base_seq);
4673 list_for_each_entry_rcu(table, &nft_net->tables, list) {
4674 if (ctx->family != NFPROTO_UNSPEC &&
4675 ctx->family != table->family)
4678 if (ctx->table && ctx->table != table)
4682 if (cur_table != table)
4688 list_for_each_entry_rcu(set, &table->sets, list) {
4691 if (!nft_is_active(net, set))
4695 ctx_set.table = table;
4696 ctx_set.family = table->family;
4698 if (nf_tables_fill_set(skb, &ctx_set, set,
4702 cb->args[2] = (unsigned long) table;
4705 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4718 static int nf_tables_dump_sets_start(struct netlink_callback *cb)
4720 struct nft_ctx *ctx_dump = NULL;
4722 ctx_dump = kmemdup(cb->data, sizeof(*ctx_dump), GFP_ATOMIC);
4723 if (ctx_dump == NULL)
4726 cb->data = ctx_dump;
4730 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
4736 /* called with rcu_read_lock held */
4737 static int nf_tables_getset(struct sk_buff *skb, const struct nfnl_info *info,
4738 const struct nlattr * const nla[])
4740 struct netlink_ext_ack *extack = info->extack;
4741 u8 genmask = nft_genmask_cur(info->net);
4742 u8 family = info->nfmsg->nfgen_family;
4743 struct nft_table *table = NULL;
4744 struct net *net = info->net;
4745 const struct nft_set *set;
4746 struct sk_buff *skb2;
4750 if (nla[NFTA_SET_TABLE]) {
4751 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
4753 if (IS_ERR(table)) {
4754 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4755 return PTR_ERR(table);
4759 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4761 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
4762 struct netlink_dump_control c = {
4763 .start = nf_tables_dump_sets_start,
4764 .dump = nf_tables_dump_sets,
4765 .done = nf_tables_dump_sets_done,
4767 .module = THIS_MODULE,
4770 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
4773 /* Only accept unspec with dump */
4774 if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
4775 return -EAFNOSUPPORT;
4776 if (!nla[NFTA_SET_TABLE])
4779 set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
4781 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4782 return PTR_ERR(set);
4785 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
4789 err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
4791 goto err_fill_set_info;
4793 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
4800 static int nft_set_desc_concat_parse(const struct nlattr *attr,
4801 struct nft_set_desc *desc)
4803 struct nlattr *tb[NFTA_SET_FIELD_MAX + 1];
4807 if (desc->field_count >= ARRAY_SIZE(desc->field_len))
4810 err = nla_parse_nested_deprecated(tb, NFTA_SET_FIELD_MAX, attr,
4811 nft_concat_policy, NULL);
4815 if (!tb[NFTA_SET_FIELD_LEN])
4818 len = ntohl(nla_get_be32(tb[NFTA_SET_FIELD_LEN]));
4819 if (!len || len > U8_MAX)
4822 desc->field_len[desc->field_count++] = len;
4827 static int nft_set_desc_concat(struct nft_set_desc *desc,
4828 const struct nlattr *nla)
4830 u32 num_regs = 0, key_num_regs = 0;
4831 struct nlattr *attr;
4834 nla_for_each_nested(attr, nla, rem) {
4835 if (nla_type(attr) != NFTA_LIST_ELEM)
4838 err = nft_set_desc_concat_parse(attr, desc);
4843 for (i = 0; i < desc->field_count; i++)
4844 num_regs += DIV_ROUND_UP(desc->field_len[i], sizeof(u32));
4846 key_num_regs = DIV_ROUND_UP(desc->klen, sizeof(u32));
4847 if (key_num_regs != num_regs)
4850 if (num_regs > NFT_REG32_COUNT)
4856 static int nf_tables_set_desc_parse(struct nft_set_desc *desc,
4857 const struct nlattr *nla)
4859 struct nlattr *da[NFTA_SET_DESC_MAX + 1];
4862 err = nla_parse_nested_deprecated(da, NFTA_SET_DESC_MAX, nla,
4863 nft_set_desc_policy, NULL);
4867 if (da[NFTA_SET_DESC_SIZE] != NULL)
4868 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
4869 if (da[NFTA_SET_DESC_CONCAT])
4870 err = nft_set_desc_concat(desc, da[NFTA_SET_DESC_CONCAT]);
4875 static int nft_set_expr_alloc(struct nft_ctx *ctx, struct nft_set *set,
4876 const struct nlattr * const *nla,
4877 struct nft_expr **exprs, int *num_exprs,
4880 struct nft_expr *expr;
4883 if (nla[NFTA_SET_EXPR]) {
4884 expr = nft_set_elem_expr_alloc(ctx, set, nla[NFTA_SET_EXPR]);
4886 err = PTR_ERR(expr);
4887 goto err_set_expr_alloc;
4891 } else if (nla[NFTA_SET_EXPRESSIONS]) {
4895 if (!(flags & NFT_SET_EXPR)) {
4897 goto err_set_expr_alloc;
4900 nla_for_each_nested(tmp, nla[NFTA_SET_EXPRESSIONS], left) {
4901 if (i == NFT_SET_EXPR_MAX) {
4903 goto err_set_expr_alloc;
4905 if (nla_type(tmp) != NFTA_LIST_ELEM) {
4907 goto err_set_expr_alloc;
4909 expr = nft_set_elem_expr_alloc(ctx, set, tmp);
4911 err = PTR_ERR(expr);
4912 goto err_set_expr_alloc;
4922 for (i = 0; i < *num_exprs; i++)
4923 nft_expr_destroy(ctx, exprs[i]);
4928 static bool nft_set_is_same(const struct nft_set *set,
4929 const struct nft_set_desc *desc,
4930 struct nft_expr *exprs[], u32 num_exprs, u32 flags)
4934 if (set->ktype != desc->ktype ||
4935 set->dtype != desc->dtype ||
4936 set->flags != flags ||
4937 set->klen != desc->klen ||
4938 set->dlen != desc->dlen ||
4939 set->field_count != desc->field_count ||
4940 set->num_exprs != num_exprs)
4943 for (i = 0; i < desc->field_count; i++) {
4944 if (set->field_len[i] != desc->field_len[i])
4948 for (i = 0; i < num_exprs; i++) {
4949 if (set->exprs[i]->ops != exprs[i]->ops)
4956 static int nf_tables_newset(struct sk_buff *skb, const struct nfnl_info *info,
4957 const struct nlattr * const nla[])
4959 struct netlink_ext_ack *extack = info->extack;
4960 u8 genmask = nft_genmask_next(info->net);
4961 u8 family = info->nfmsg->nfgen_family;
4962 const struct nft_set_ops *ops;
4963 struct net *net = info->net;
4964 struct nft_set_desc desc;
4965 struct nft_table *table;
4966 unsigned char *udata;
4967 struct nft_set *set;
4977 if (nla[NFTA_SET_TABLE] == NULL ||
4978 nla[NFTA_SET_NAME] == NULL ||
4979 nla[NFTA_SET_KEY_LEN] == NULL ||
4980 nla[NFTA_SET_ID] == NULL)
4983 memset(&desc, 0, sizeof(desc));
4985 desc.ktype = NFT_DATA_VALUE;
4986 if (nla[NFTA_SET_KEY_TYPE] != NULL) {
4987 desc.ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
4988 if ((desc.ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
4992 desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
4993 if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
4997 if (nla[NFTA_SET_FLAGS] != NULL) {
4998 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
4999 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
5000 NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
5001 NFT_SET_MAP | NFT_SET_EVAL |
5002 NFT_SET_OBJECT | NFT_SET_CONCAT | NFT_SET_EXPR))
5004 /* Only one of these operations is supported */
5005 if ((flags & (NFT_SET_MAP | NFT_SET_OBJECT)) ==
5006 (NFT_SET_MAP | NFT_SET_OBJECT))
5008 if ((flags & (NFT_SET_EVAL | NFT_SET_OBJECT)) ==
5009 (NFT_SET_EVAL | NFT_SET_OBJECT))
5011 if ((flags & (NFT_SET_ANONYMOUS | NFT_SET_TIMEOUT | NFT_SET_EVAL)) ==
5012 (NFT_SET_ANONYMOUS | NFT_SET_TIMEOUT))
5014 if ((flags & (NFT_SET_CONSTANT | NFT_SET_TIMEOUT)) ==
5015 (NFT_SET_CONSTANT | NFT_SET_TIMEOUT))
5020 if (nla[NFTA_SET_DATA_TYPE] != NULL) {
5021 if (!(flags & NFT_SET_MAP))
5024 desc.dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
5025 if ((desc.dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
5026 desc.dtype != NFT_DATA_VERDICT)
5029 if (desc.dtype != NFT_DATA_VERDICT) {
5030 if (nla[NFTA_SET_DATA_LEN] == NULL)
5032 desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
5033 if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
5036 desc.dlen = sizeof(struct nft_verdict);
5037 } else if (flags & NFT_SET_MAP)
5040 if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
5041 if (!(flags & NFT_SET_OBJECT))
5044 desc.objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
5045 if (desc.objtype == NFT_OBJECT_UNSPEC ||
5046 desc.objtype > NFT_OBJECT_MAX)
5048 } else if (flags & NFT_SET_OBJECT)
5051 desc.objtype = NFT_OBJECT_UNSPEC;
5054 if (nla[NFTA_SET_TIMEOUT] != NULL) {
5055 if (!(flags & NFT_SET_TIMEOUT))
5058 if (flags & NFT_SET_ANONYMOUS)
5061 err = nf_msecs_to_jiffies64(nla[NFTA_SET_TIMEOUT], &desc.timeout);
5066 if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
5067 if (!(flags & NFT_SET_TIMEOUT))
5070 if (flags & NFT_SET_ANONYMOUS)
5073 desc.gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
5076 desc.policy = NFT_SET_POL_PERFORMANCE;
5077 if (nla[NFTA_SET_POLICY] != NULL) {
5078 desc.policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
5079 switch (desc.policy) {
5080 case NFT_SET_POL_PERFORMANCE:
5081 case NFT_SET_POL_MEMORY:
5088 if (nla[NFTA_SET_DESC] != NULL) {
5089 err = nf_tables_set_desc_parse(&desc, nla[NFTA_SET_DESC]);
5093 if (desc.field_count > 1) {
5094 if (!(flags & NFT_SET_CONCAT))
5096 } else if (flags & NFT_SET_CONCAT) {
5099 } else if (flags & NFT_SET_CONCAT) {
5103 if (nla[NFTA_SET_EXPR] || nla[NFTA_SET_EXPRESSIONS])
5106 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, genmask,
5107 NETLINK_CB(skb).portid);
5108 if (IS_ERR(table)) {
5109 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
5110 return PTR_ERR(table);
5113 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
5115 set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
5117 if (PTR_ERR(set) != -ENOENT) {
5118 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
5119 return PTR_ERR(set);
5122 struct nft_expr *exprs[NFT_SET_EXPR_MAX] = {};
5124 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
5125 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
5128 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
5131 if (nft_set_is_anonymous(set))
5134 err = nft_set_expr_alloc(&ctx, set, nla, exprs, &num_exprs, flags);
5139 if (!nft_set_is_same(set, &desc, exprs, num_exprs, flags)) {
5140 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
5144 for (i = 0; i < num_exprs; i++)
5145 nft_expr_destroy(&ctx, exprs[i]);
5150 return __nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set, &desc);
5153 if (!(info->nlh->nlmsg_flags & NLM_F_CREATE))
5156 ops = nft_select_set_ops(&ctx, flags, &desc);
5158 return PTR_ERR(ops);
5161 if (nla[NFTA_SET_USERDATA])
5162 udlen = nla_len(nla[NFTA_SET_USERDATA]);
5165 if (ops->privsize != NULL)
5166 size = ops->privsize(nla, &desc);
5167 alloc_size = sizeof(*set) + size + udlen;
5168 if (alloc_size < size || alloc_size > INT_MAX)
5171 if (!nft_use_inc(&table->use))
5174 set = kvzalloc(alloc_size, GFP_KERNEL_ACCOUNT);
5180 name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL_ACCOUNT);
5186 err = nf_tables_set_alloc_name(&ctx, set, name);
5193 udata = set->data + size;
5194 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
5197 INIT_LIST_HEAD(&set->bindings);
5198 INIT_LIST_HEAD(&set->catchall_list);
5199 refcount_set(&set->refs, 1);
5201 write_pnet(&set->net, net);
5203 set->ktype = desc.ktype;
5204 set->klen = desc.klen;
5205 set->dtype = desc.dtype;
5206 set->objtype = desc.objtype;
5207 set->dlen = desc.dlen;
5209 set->size = desc.size;
5210 set->policy = desc.policy;
5213 set->timeout = desc.timeout;
5214 set->gc_int = desc.gc_int;
5216 set->field_count = desc.field_count;
5217 for (i = 0; i < desc.field_count; i++)
5218 set->field_len[i] = desc.field_len[i];
5220 err = ops->init(set, &desc, nla);
5224 err = nft_set_expr_alloc(&ctx, set, nla, set->exprs, &num_exprs, flags);
5226 goto err_set_destroy;
5228 set->num_exprs = num_exprs;
5229 set->handle = nf_tables_alloc_handle(table);
5230 INIT_LIST_HEAD(&set->pending_update);
5232 err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
5234 goto err_set_expr_alloc;
5236 list_add_tail_rcu(&set->list, &table->sets);
5241 for (i = 0; i < set->num_exprs; i++)
5242 nft_expr_destroy(&ctx, set->exprs[i]);
5244 ops->destroy(&ctx, set);
5250 nft_use_dec_restore(&table->use);
5255 static void nft_set_catchall_destroy(const struct nft_ctx *ctx,
5256 struct nft_set *set)
5258 struct nft_set_elem_catchall *next, *catchall;
5260 list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
5261 list_del_rcu(&catchall->list);
5262 nf_tables_set_elem_destroy(ctx, set, catchall->elem);
5263 kfree_rcu(catchall, rcu);
5267 static void nft_set_put(struct nft_set *set)
5269 if (refcount_dec_and_test(&set->refs)) {
5275 static void nft_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
5279 if (WARN_ON(set->use > 0))
5282 for (i = 0; i < set->num_exprs; i++)
5283 nft_expr_destroy(ctx, set->exprs[i]);
5285 set->ops->destroy(ctx, set);
5286 nft_set_catchall_destroy(ctx, set);
5290 static int nf_tables_delset(struct sk_buff *skb, const struct nfnl_info *info,
5291 const struct nlattr * const nla[])
5293 struct netlink_ext_ack *extack = info->extack;
5294 u8 genmask = nft_genmask_next(info->net);
5295 u8 family = info->nfmsg->nfgen_family;
5296 struct net *net = info->net;
5297 const struct nlattr *attr;
5298 struct nft_table *table;
5299 struct nft_set *set;
5302 if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
5303 return -EAFNOSUPPORT;
5305 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
5306 genmask, NETLINK_CB(skb).portid);
5307 if (IS_ERR(table)) {
5308 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
5309 return PTR_ERR(table);
5312 if (nla[NFTA_SET_HANDLE]) {
5313 attr = nla[NFTA_SET_HANDLE];
5314 set = nft_set_lookup_byhandle(table, attr, genmask);
5316 attr = nla[NFTA_SET_NAME];
5317 set = nft_set_lookup(table, attr, genmask);
5321 if (PTR_ERR(set) == -ENOENT &&
5322 NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYSET)
5325 NL_SET_BAD_ATTR(extack, attr);
5326 return PTR_ERR(set);
5329 (info->nlh->nlmsg_flags & NLM_F_NONREC &&
5330 atomic_read(&set->nelems) > 0)) {
5331 NL_SET_BAD_ATTR(extack, attr);
5335 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
5337 return nft_delset(&ctx, set);
5340 static int nft_validate_register_store(const struct nft_ctx *ctx,
5341 enum nft_registers reg,
5342 const struct nft_data *data,
5343 enum nft_data_types type,
5346 static int nft_setelem_data_validate(const struct nft_ctx *ctx,
5347 struct nft_set *set,
5348 struct nft_elem_priv *elem_priv)
5350 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem_priv);
5351 enum nft_registers dreg;
5353 dreg = nft_type_to_reg(set->dtype);
5354 return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
5355 set->dtype == NFT_DATA_VERDICT ?
5356 NFT_DATA_VERDICT : NFT_DATA_VALUE,
5360 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
5361 struct nft_set *set,
5362 const struct nft_set_iter *iter,
5363 struct nft_elem_priv *elem_priv)
5365 return nft_setelem_data_validate(ctx, set, elem_priv);
5368 static int nft_set_catchall_bind_check(const struct nft_ctx *ctx,
5369 struct nft_set *set)
5371 u8 genmask = nft_genmask_next(ctx->net);
5372 struct nft_set_elem_catchall *catchall;
5373 struct nft_set_ext *ext;
5376 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5377 ext = nft_set_elem_ext(set, catchall->elem);
5378 if (!nft_set_elem_active(ext, genmask))
5381 ret = nft_setelem_data_validate(ctx, set, catchall->elem);
5389 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
5390 struct nft_set_binding *binding)
5392 struct nft_set_binding *i;
5393 struct nft_set_iter iter;
5395 if (!list_empty(&set->bindings) && nft_set_is_anonymous(set))
5398 if (binding->flags & NFT_SET_MAP) {
5399 /* If the set is already bound to the same chain all
5400 * jumps are already validated for that chain.
5402 list_for_each_entry(i, &set->bindings, list) {
5403 if (i->flags & NFT_SET_MAP &&
5404 i->chain == binding->chain)
5408 iter.genmask = nft_genmask_next(ctx->net);
5412 iter.fn = nf_tables_bind_check_setelem;
5414 set->ops->walk(ctx, set, &iter);
5416 iter.err = nft_set_catchall_bind_check(ctx, set);
5422 if (!nft_use_inc(&set->use))
5425 binding->chain = ctx->chain;
5426 list_add_tail_rcu(&binding->list, &set->bindings);
5427 nft_set_trans_bind(ctx, set);
5431 EXPORT_SYMBOL_GPL(nf_tables_bind_set);
5433 static void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
5434 struct nft_set_binding *binding, bool event)
5436 list_del_rcu(&binding->list);
5438 if (list_empty(&set->bindings) && nft_set_is_anonymous(set)) {
5439 list_del_rcu(&set->list);
5442 nf_tables_set_notify(ctx, set, NFT_MSG_DELSET,
5447 static void nft_setelem_data_activate(const struct net *net,
5448 const struct nft_set *set,
5449 struct nft_elem_priv *elem_priv);
5451 static int nft_mapelem_activate(const struct nft_ctx *ctx,
5452 struct nft_set *set,
5453 const struct nft_set_iter *iter,
5454 struct nft_elem_priv *elem_priv)
5456 nft_setelem_data_activate(ctx->net, set, elem_priv);
5461 static void nft_map_catchall_activate(const struct nft_ctx *ctx,
5462 struct nft_set *set)
5464 u8 genmask = nft_genmask_next(ctx->net);
5465 struct nft_set_elem_catchall *catchall;
5466 struct nft_set_ext *ext;
5468 list_for_each_entry(catchall, &set->catchall_list, list) {
5469 ext = nft_set_elem_ext(set, catchall->elem);
5470 if (!nft_set_elem_active(ext, genmask))
5473 nft_setelem_data_activate(ctx->net, set, catchall->elem);
5478 static void nft_map_activate(const struct nft_ctx *ctx, struct nft_set *set)
5480 struct nft_set_iter iter = {
5481 .genmask = nft_genmask_next(ctx->net),
5482 .fn = nft_mapelem_activate,
5485 set->ops->walk(ctx, set, &iter);
5486 WARN_ON_ONCE(iter.err);
5488 nft_map_catchall_activate(ctx, set);
5491 void nf_tables_activate_set(const struct nft_ctx *ctx, struct nft_set *set)
5493 if (nft_set_is_anonymous(set)) {
5494 if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
5495 nft_map_activate(ctx, set);
5497 nft_clear(ctx->net, set);
5500 nft_use_inc_restore(&set->use);
5502 EXPORT_SYMBOL_GPL(nf_tables_activate_set);
5504 void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set,
5505 struct nft_set_binding *binding,
5506 enum nft_trans_phase phase)
5509 case NFT_TRANS_PREPARE_ERROR:
5510 nft_set_trans_unbind(ctx, set);
5511 if (nft_set_is_anonymous(set))
5512 nft_deactivate_next(ctx->net, set);
5514 list_del_rcu(&binding->list);
5516 nft_use_dec(&set->use);
5518 case NFT_TRANS_PREPARE:
5519 if (nft_set_is_anonymous(set)) {
5520 if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
5521 nft_map_deactivate(ctx, set);
5523 nft_deactivate_next(ctx->net, set);
5525 nft_use_dec(&set->use);
5527 case NFT_TRANS_ABORT:
5528 case NFT_TRANS_RELEASE:
5529 if (nft_set_is_anonymous(set) &&
5530 set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
5531 nft_map_deactivate(ctx, set);
5533 nft_use_dec(&set->use);
5536 nf_tables_unbind_set(ctx, set, binding,
5537 phase == NFT_TRANS_COMMIT);
5540 EXPORT_SYMBOL_GPL(nf_tables_deactivate_set);
5542 void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set)
5544 if (list_empty(&set->bindings) && nft_set_is_anonymous(set))
5545 nft_set_destroy(ctx, set);
5547 EXPORT_SYMBOL_GPL(nf_tables_destroy_set);
5549 const struct nft_set_ext_type nft_set_ext_types[] = {
5550 [NFT_SET_EXT_KEY] = {
5551 .align = __alignof__(u32),
5553 [NFT_SET_EXT_DATA] = {
5554 .align = __alignof__(u32),
5556 [NFT_SET_EXT_EXPRESSIONS] = {
5557 .align = __alignof__(struct nft_set_elem_expr),
5559 [NFT_SET_EXT_OBJREF] = {
5560 .len = sizeof(struct nft_object *),
5561 .align = __alignof__(struct nft_object *),
5563 [NFT_SET_EXT_FLAGS] = {
5565 .align = __alignof__(u8),
5567 [NFT_SET_EXT_TIMEOUT] = {
5569 .align = __alignof__(u64),
5571 [NFT_SET_EXT_EXPIRATION] = {
5573 .align = __alignof__(u64),
5575 [NFT_SET_EXT_USERDATA] = {
5576 .len = sizeof(struct nft_userdata),
5577 .align = __alignof__(struct nft_userdata),
5579 [NFT_SET_EXT_KEY_END] = {
5580 .align = __alignof__(u32),
5588 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
5589 [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED },
5590 [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED },
5591 [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 },
5592 [NFTA_SET_ELEM_TIMEOUT] = { .type = NLA_U64 },
5593 [NFTA_SET_ELEM_EXPIRATION] = { .type = NLA_U64 },
5594 [NFTA_SET_ELEM_USERDATA] = { .type = NLA_BINARY,
5595 .len = NFT_USERDATA_MAXLEN },
5596 [NFTA_SET_ELEM_EXPR] = { .type = NLA_NESTED },
5597 [NFTA_SET_ELEM_OBJREF] = { .type = NLA_STRING,
5598 .len = NFT_OBJ_MAXNAMELEN - 1 },
5599 [NFTA_SET_ELEM_KEY_END] = { .type = NLA_NESTED },
5600 [NFTA_SET_ELEM_EXPRESSIONS] = NLA_POLICY_NESTED_ARRAY(nft_expr_policy),
5603 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
5604 [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING,
5605 .len = NFT_TABLE_MAXNAMELEN - 1 },
5606 [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING,
5607 .len = NFT_SET_MAXNAMELEN - 1 },
5608 [NFTA_SET_ELEM_LIST_ELEMENTS] = NLA_POLICY_NESTED_ARRAY(nft_set_elem_policy),
5609 [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 },
5612 static int nft_set_elem_expr_dump(struct sk_buff *skb,
5613 const struct nft_set *set,
5614 const struct nft_set_ext *ext,
5617 struct nft_set_elem_expr *elem_expr;
5618 u32 size, num_exprs = 0;
5619 struct nft_expr *expr;
5620 struct nlattr *nest;
5622 elem_expr = nft_set_ext_expr(ext);
5623 nft_setelem_expr_foreach(expr, elem_expr, size)
5626 if (num_exprs == 1) {
5627 expr = nft_setelem_expr_at(elem_expr, 0);
5628 if (nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, expr, reset) < 0)
5632 } else if (num_exprs > 1) {
5633 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_EXPRESSIONS);
5635 goto nla_put_failure;
5637 nft_setelem_expr_foreach(expr, elem_expr, size) {
5638 expr = nft_setelem_expr_at(elem_expr, size);
5639 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr, reset) < 0)
5640 goto nla_put_failure;
5642 nla_nest_end(skb, nest);
5650 static int nf_tables_fill_setelem(struct sk_buff *skb,
5651 const struct nft_set *set,
5652 const struct nft_elem_priv *elem_priv,
5655 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem_priv);
5656 unsigned char *b = skb_tail_pointer(skb);
5657 struct nlattr *nest;
5659 nest = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
5661 goto nla_put_failure;
5663 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) &&
5664 nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
5665 NFT_DATA_VALUE, set->klen) < 0)
5666 goto nla_put_failure;
5668 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
5669 nft_data_dump(skb, NFTA_SET_ELEM_KEY_END, nft_set_ext_key_end(ext),
5670 NFT_DATA_VALUE, set->klen) < 0)
5671 goto nla_put_failure;
5673 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
5674 nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
5675 set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
5677 goto nla_put_failure;
5679 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS) &&
5680 nft_set_elem_expr_dump(skb, set, ext, reset))
5681 goto nla_put_failure;
5683 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
5684 nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
5685 (*nft_set_ext_obj(ext))->key.name) < 0)
5686 goto nla_put_failure;
5688 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
5689 nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
5690 htonl(*nft_set_ext_flags(ext))))
5691 goto nla_put_failure;
5693 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
5694 nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
5695 nf_jiffies64_to_msecs(*nft_set_ext_timeout(ext)),
5697 goto nla_put_failure;
5699 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
5700 u64 expires, now = get_jiffies_64();
5702 expires = *nft_set_ext_expiration(ext);
5703 if (time_before64(now, expires))
5708 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
5709 nf_jiffies64_to_msecs(expires),
5711 goto nla_put_failure;
5714 if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
5715 struct nft_userdata *udata;
5717 udata = nft_set_ext_userdata(ext);
5718 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
5719 udata->len + 1, udata->data))
5720 goto nla_put_failure;
5723 nla_nest_end(skb, nest);
5731 struct nft_set_dump_args {
5732 const struct netlink_callback *cb;
5733 struct nft_set_iter iter;
5734 struct sk_buff *skb;
5738 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
5739 struct nft_set *set,
5740 const struct nft_set_iter *iter,
5741 struct nft_elem_priv *elem_priv)
5743 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem_priv);
5744 struct nft_set_dump_args *args;
5746 if (nft_set_elem_expired(ext) || nft_set_elem_is_dead(ext))
5749 args = container_of(iter, struct nft_set_dump_args, iter);
5750 return nf_tables_fill_setelem(args->skb, set, elem_priv, args->reset);
5753 static void audit_log_nft_set_reset(const struct nft_table *table,
5754 unsigned int base_seq,
5755 unsigned int nentries)
5757 char *buf = kasprintf(GFP_ATOMIC, "%s:%u", table->name, base_seq);
5759 audit_log_nfcfg(buf, table->family, nentries,
5760 AUDIT_NFT_OP_SETELEM_RESET, GFP_ATOMIC);
5764 struct nft_set_dump_ctx {
5765 const struct nft_set *set;
5770 static int nft_set_catchall_dump(struct net *net, struct sk_buff *skb,
5771 const struct nft_set *set, bool reset,
5772 unsigned int base_seq)
5774 struct nft_set_elem_catchall *catchall;
5775 u8 genmask = nft_genmask_cur(net);
5776 struct nft_set_ext *ext;
5779 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5780 ext = nft_set_elem_ext(set, catchall->elem);
5781 if (!nft_set_elem_active(ext, genmask) ||
5782 nft_set_elem_expired(ext))
5785 ret = nf_tables_fill_setelem(skb, set, catchall->elem, reset);
5787 audit_log_nft_set_reset(set->table, base_seq, 1);
5794 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
5796 struct nft_set_dump_ctx *dump_ctx = cb->data;
5797 struct net *net = sock_net(skb->sk);
5798 struct nftables_pernet *nft_net;
5799 struct nft_table *table;
5800 struct nft_set *set;
5801 struct nft_set_dump_args args;
5802 bool set_found = false;
5803 struct nlmsghdr *nlh;
5804 struct nlattr *nest;
5809 nft_net = nft_pernet(net);
5810 cb->seq = READ_ONCE(nft_net->base_seq);
5812 list_for_each_entry_rcu(table, &nft_net->tables, list) {
5813 if (dump_ctx->ctx.family != NFPROTO_UNSPEC &&
5814 dump_ctx->ctx.family != table->family)
5817 if (table != dump_ctx->ctx.table)
5820 list_for_each_entry_rcu(set, &table->sets, list) {
5821 if (set == dump_ctx->set) {
5834 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM);
5835 portid = NETLINK_CB(cb->skb).portid;
5836 seq = cb->nlh->nlmsg_seq;
5838 nlh = nfnl_msg_put(skb, portid, seq, event, NLM_F_MULTI,
5839 table->family, NFNETLINK_V0, nft_base_seq(net));
5841 goto nla_put_failure;
5843 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name))
5844 goto nla_put_failure;
5845 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
5846 goto nla_put_failure;
5848 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
5850 goto nla_put_failure;
5854 args.reset = dump_ctx->reset;
5855 args.iter.genmask = nft_genmask_cur(net);
5856 args.iter.skip = cb->args[0];
5857 args.iter.count = 0;
5859 args.iter.fn = nf_tables_dump_setelem;
5860 set->ops->walk(&dump_ctx->ctx, set, &args.iter);
5862 if (!args.iter.err && args.iter.count == cb->args[0])
5863 args.iter.err = nft_set_catchall_dump(net, skb, set,
5864 dump_ctx->reset, cb->seq);
5865 nla_nest_end(skb, nest);
5866 nlmsg_end(skb, nlh);
5870 if (args.iter.err && args.iter.err != -EMSGSIZE)
5871 return args.iter.err;
5872 if (args.iter.count == cb->args[0])
5875 cb->args[0] = args.iter.count;
5883 static int nf_tables_dumpreset_set(struct sk_buff *skb,
5884 struct netlink_callback *cb)
5886 struct nftables_pernet *nft_net = nft_pernet(sock_net(skb->sk));
5887 struct nft_set_dump_ctx *dump_ctx = cb->data;
5888 int ret, skip = cb->args[0];
5890 mutex_lock(&nft_net->commit_mutex);
5892 ret = nf_tables_dump_set(skb, cb);
5894 if (cb->args[0] > skip)
5895 audit_log_nft_set_reset(dump_ctx->ctx.table, cb->seq,
5896 cb->args[0] - skip);
5898 mutex_unlock(&nft_net->commit_mutex);
5903 static int nf_tables_dump_set_start(struct netlink_callback *cb)
5905 struct nft_set_dump_ctx *dump_ctx = cb->data;
5907 cb->data = kmemdup(dump_ctx, sizeof(*dump_ctx), GFP_ATOMIC);
5909 return cb->data ? 0 : -ENOMEM;
5912 static int nf_tables_dump_set_done(struct netlink_callback *cb)
5918 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
5919 const struct nft_ctx *ctx, u32 seq,
5920 u32 portid, int event, u16 flags,
5921 const struct nft_set *set,
5922 const struct nft_elem_priv *elem_priv,
5925 struct nlmsghdr *nlh;
5926 struct nlattr *nest;
5929 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
5930 nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
5931 NFNETLINK_V0, nft_base_seq(ctx->net));
5933 goto nla_put_failure;
5935 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
5936 goto nla_put_failure;
5937 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
5938 goto nla_put_failure;
5940 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
5942 goto nla_put_failure;
5944 err = nf_tables_fill_setelem(skb, set, elem_priv, reset);
5946 goto nla_put_failure;
5948 nla_nest_end(skb, nest);
5950 nlmsg_end(skb, nlh);
5954 nlmsg_trim(skb, nlh);
5958 static int nft_setelem_parse_flags(const struct nft_set *set,
5959 const struct nlattr *attr, u32 *flags)
5964 *flags = ntohl(nla_get_be32(attr));
5965 if (*flags & ~(NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL))
5967 if (!(set->flags & NFT_SET_INTERVAL) &&
5968 *flags & NFT_SET_ELEM_INTERVAL_END)
5970 if ((*flags & (NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL)) ==
5971 (NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL))
5977 static int nft_setelem_parse_key(struct nft_ctx *ctx, const struct nft_set *set,
5978 struct nft_data *key, struct nlattr *attr)
5980 struct nft_data_desc desc = {
5981 .type = NFT_DATA_VALUE,
5982 .size = NFT_DATA_VALUE_MAXLEN,
5986 return nft_data_init(ctx, key, &desc, attr);
5989 static int nft_setelem_parse_data(struct nft_ctx *ctx, struct nft_set *set,
5990 struct nft_data_desc *desc,
5991 struct nft_data *data,
5992 struct nlattr *attr)
5996 if (set->dtype == NFT_DATA_VERDICT)
5997 dtype = NFT_DATA_VERDICT;
5999 dtype = NFT_DATA_VALUE;
6002 desc->size = NFT_DATA_VALUE_MAXLEN;
6003 desc->len = set->dlen;
6004 desc->flags = NFT_DATA_DESC_SETELEM;
6006 return nft_data_init(ctx, data, desc, attr);
6009 static void *nft_setelem_catchall_get(const struct net *net,
6010 const struct nft_set *set)
6012 struct nft_set_elem_catchall *catchall;
6013 u8 genmask = nft_genmask_cur(net);
6014 struct nft_set_ext *ext;
6017 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
6018 ext = nft_set_elem_ext(set, catchall->elem);
6019 if (!nft_set_elem_active(ext, genmask) ||
6020 nft_set_elem_expired(ext))
6023 priv = catchall->elem;
6030 static int nft_setelem_get(struct nft_ctx *ctx, const struct nft_set *set,
6031 struct nft_set_elem *elem, u32 flags)
6035 if (!(flags & NFT_SET_ELEM_CATCHALL)) {
6036 priv = set->ops->get(ctx->net, set, elem, flags);
6038 return PTR_ERR(priv);
6040 priv = nft_setelem_catchall_get(ctx->net, set);
6049 static int nft_get_set_elem(struct nft_ctx *ctx, const struct nft_set *set,
6050 const struct nlattr *attr, bool reset)
6052 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
6053 struct nft_set_elem elem;
6054 struct sk_buff *skb;
6058 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
6059 nft_set_elem_policy, NULL);
6063 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
6067 if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
6070 if (nla[NFTA_SET_ELEM_KEY]) {
6071 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
6072 nla[NFTA_SET_ELEM_KEY]);
6077 if (nla[NFTA_SET_ELEM_KEY_END]) {
6078 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
6079 nla[NFTA_SET_ELEM_KEY_END]);
6084 err = nft_setelem_get(ctx, set, &elem, flags);
6089 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
6093 err = nf_tables_fill_setelem_info(skb, ctx, ctx->seq, ctx->portid,
6094 NFT_MSG_NEWSETELEM, 0, set, elem.priv,
6097 goto err_fill_setelem;
6099 return nfnetlink_unicast(skb, ctx->net, ctx->portid);
6106 static int nft_set_dump_ctx_init(struct nft_set_dump_ctx *dump_ctx,
6107 const struct sk_buff *skb,
6108 const struct nfnl_info *info,
6109 const struct nlattr * const nla[],
6112 struct netlink_ext_ack *extack = info->extack;
6113 u8 genmask = nft_genmask_cur(info->net);
6114 u8 family = info->nfmsg->nfgen_family;
6115 struct net *net = info->net;
6116 struct nft_table *table;
6117 struct nft_set *set;
6119 table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
6121 if (IS_ERR(table)) {
6122 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
6123 return PTR_ERR(table);
6126 set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
6128 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_SET]);
6129 return PTR_ERR(set);
6132 nft_ctx_init(&dump_ctx->ctx, net, skb,
6133 info->nlh, family, table, NULL, nla);
6134 dump_ctx->set = set;
6135 dump_ctx->reset = reset;
6139 /* called with rcu_read_lock held */
6140 static int nf_tables_getsetelem(struct sk_buff *skb,
6141 const struct nfnl_info *info,
6142 const struct nlattr * const nla[])
6144 struct netlink_ext_ack *extack = info->extack;
6145 struct nft_set_dump_ctx dump_ctx;
6146 struct nlattr *attr;
6149 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
6150 struct netlink_dump_control c = {
6151 .start = nf_tables_dump_set_start,
6152 .dump = nf_tables_dump_set,
6153 .done = nf_tables_dump_set_done,
6154 .module = THIS_MODULE,
6157 err = nft_set_dump_ctx_init(&dump_ctx, skb, info, nla, false);
6162 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
6165 if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
6168 err = nft_set_dump_ctx_init(&dump_ctx, skb, info, nla, false);
6172 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
6173 err = nft_get_set_elem(&dump_ctx.ctx, dump_ctx.set, attr, false);
6175 NL_SET_BAD_ATTR(extack, attr);
6183 static int nf_tables_getsetelem_reset(struct sk_buff *skb,
6184 const struct nfnl_info *info,
6185 const struct nlattr * const nla[])
6187 struct nftables_pernet *nft_net = nft_pernet(info->net);
6188 struct netlink_ext_ack *extack = info->extack;
6189 struct nft_set_dump_ctx dump_ctx;
6190 int rem, err = 0, nelems = 0;
6191 struct nlattr *attr;
6193 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
6194 struct netlink_dump_control c = {
6195 .start = nf_tables_dump_set_start,
6196 .dump = nf_tables_dumpreset_set,
6197 .done = nf_tables_dump_set_done,
6198 .module = THIS_MODULE,
6201 err = nft_set_dump_ctx_init(&dump_ctx, skb, info, nla, true);
6206 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
6209 if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
6212 if (!try_module_get(THIS_MODULE))
6215 mutex_lock(&nft_net->commit_mutex);
6218 err = nft_set_dump_ctx_init(&dump_ctx, skb, info, nla, true);
6222 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
6223 err = nft_get_set_elem(&dump_ctx.ctx, dump_ctx.set, attr, true);
6225 NL_SET_BAD_ATTR(extack, attr);
6230 audit_log_nft_set_reset(dump_ctx.ctx.table, nft_net->base_seq, nelems);
6234 mutex_unlock(&nft_net->commit_mutex);
6236 module_put(THIS_MODULE);
6241 static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
6242 const struct nft_set *set,
6243 const struct nft_elem_priv *elem_priv,
6246 struct nftables_pernet *nft_net;
6247 struct net *net = ctx->net;
6248 u32 portid = ctx->portid;
6249 struct sk_buff *skb;
6253 if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
6256 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
6260 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
6261 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
6263 err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
6264 set, elem_priv, false);
6270 nft_net = nft_pernet(net);
6271 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
6274 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
6277 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
6279 struct nft_set *set)
6281 struct nft_trans *trans;
6283 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
6287 nft_trans_elem_set(trans) = set;
6291 struct nft_expr *nft_set_elem_expr_alloc(const struct nft_ctx *ctx,
6292 const struct nft_set *set,
6293 const struct nlattr *attr)
6295 struct nft_expr *expr;
6298 expr = nft_expr_init(ctx, attr);
6303 if (expr->ops->type->flags & NFT_EXPR_GC) {
6304 if (set->flags & NFT_SET_TIMEOUT)
6305 goto err_set_elem_expr;
6306 if (!set->ops->gc_init)
6307 goto err_set_elem_expr;
6308 set->ops->gc_init(set);
6314 nft_expr_destroy(ctx, expr);
6315 return ERR_PTR(err);
6318 static int nft_set_ext_check(const struct nft_set_ext_tmpl *tmpl, u8 id, u32 len)
6320 len += nft_set_ext_types[id].len;
6321 if (len > tmpl->ext_len[id] ||
6328 static int nft_set_ext_memcpy(const struct nft_set_ext_tmpl *tmpl, u8 id,
6329 void *to, const void *from, u32 len)
6331 if (nft_set_ext_check(tmpl, id, len) < 0)
6334 memcpy(to, from, len);
6339 struct nft_elem_priv *nft_set_elem_init(const struct nft_set *set,
6340 const struct nft_set_ext_tmpl *tmpl,
6341 const u32 *key, const u32 *key_end,
6343 u64 timeout, u64 expiration, gfp_t gfp)
6345 struct nft_set_ext *ext;
6348 elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
6350 return ERR_PTR(-ENOMEM);
6352 ext = nft_set_elem_ext(set, elem);
6353 nft_set_ext_init(ext, tmpl);
6355 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) &&
6356 nft_set_ext_memcpy(tmpl, NFT_SET_EXT_KEY,
6357 nft_set_ext_key(ext), key, set->klen) < 0)
6360 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
6361 nft_set_ext_memcpy(tmpl, NFT_SET_EXT_KEY_END,
6362 nft_set_ext_key_end(ext), key_end, set->klen) < 0)
6365 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
6366 nft_set_ext_memcpy(tmpl, NFT_SET_EXT_DATA,
6367 nft_set_ext_data(ext), data, set->dlen) < 0)
6370 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
6371 *nft_set_ext_expiration(ext) = get_jiffies_64() + expiration;
6372 if (expiration == 0)
6373 *nft_set_ext_expiration(ext) += timeout;
6375 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
6376 *nft_set_ext_timeout(ext) = timeout;
6383 return ERR_PTR(-EINVAL);
6386 static void __nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
6387 struct nft_expr *expr)
6389 if (expr->ops->destroy_clone) {
6390 expr->ops->destroy_clone(ctx, expr);
6391 module_put(expr->ops->type->owner);
6393 nf_tables_expr_destroy(ctx, expr);
6397 static void nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
6398 struct nft_set_elem_expr *elem_expr)
6400 struct nft_expr *expr;
6403 nft_setelem_expr_foreach(expr, elem_expr, size)
6404 __nft_set_elem_expr_destroy(ctx, expr);
6407 /* Drop references and destroy. Called from gc, dynset and abort path. */
6408 void nft_set_elem_destroy(const struct nft_set *set,
6409 const struct nft_elem_priv *elem_priv,
6412 struct nft_set_ext *ext = nft_set_elem_ext(set, elem_priv);
6413 struct nft_ctx ctx = {
6414 .net = read_pnet(&set->net),
6415 .family = set->table->family,
6418 nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE);
6419 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6420 nft_data_release(nft_set_ext_data(ext), set->dtype);
6421 if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
6422 nft_set_elem_expr_destroy(&ctx, nft_set_ext_expr(ext));
6423 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6424 nft_use_dec(&(*nft_set_ext_obj(ext))->use);
6428 EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
6430 /* Destroy element. References have been already dropped in the preparation
6431 * path via nft_setelem_data_deactivate().
6433 void nf_tables_set_elem_destroy(const struct nft_ctx *ctx,
6434 const struct nft_set *set,
6435 const struct nft_elem_priv *elem_priv)
6437 struct nft_set_ext *ext = nft_set_elem_ext(set, elem_priv);
6439 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
6440 nft_set_elem_expr_destroy(ctx, nft_set_ext_expr(ext));
6445 int nft_set_elem_expr_clone(const struct nft_ctx *ctx, struct nft_set *set,
6446 struct nft_expr *expr_array[])
6448 struct nft_expr *expr;
6451 for (i = 0; i < set->num_exprs; i++) {
6452 expr = kzalloc(set->exprs[i]->ops->size, GFP_KERNEL_ACCOUNT);
6456 err = nft_expr_clone(expr, set->exprs[i]);
6461 expr_array[i] = expr;
6467 for (k = i - 1; k >= 0; k--)
6468 nft_expr_destroy(ctx, expr_array[k]);
6473 static int nft_set_elem_expr_setup(struct nft_ctx *ctx,
6474 const struct nft_set_ext_tmpl *tmpl,
6475 const struct nft_set_ext *ext,
6476 struct nft_expr *expr_array[],
6479 struct nft_set_elem_expr *elem_expr = nft_set_ext_expr(ext);
6480 u32 len = sizeof(struct nft_set_elem_expr);
6481 struct nft_expr *expr;
6487 for (i = 0; i < num_exprs; i++)
6488 len += expr_array[i]->ops->size;
6490 if (nft_set_ext_check(tmpl, NFT_SET_EXT_EXPRESSIONS, len) < 0)
6493 for (i = 0; i < num_exprs; i++) {
6494 expr = nft_setelem_expr_at(elem_expr, elem_expr->size);
6495 err = nft_expr_clone(expr, expr_array[i]);
6497 goto err_elem_expr_setup;
6499 elem_expr->size += expr_array[i]->ops->size;
6500 nft_expr_destroy(ctx, expr_array[i]);
6501 expr_array[i] = NULL;
6506 err_elem_expr_setup:
6507 for (; i < num_exprs; i++) {
6508 nft_expr_destroy(ctx, expr_array[i]);
6509 expr_array[i] = NULL;
6515 struct nft_set_ext *nft_set_catchall_lookup(const struct net *net,
6516 const struct nft_set *set)
6518 struct nft_set_elem_catchall *catchall;
6519 u8 genmask = nft_genmask_cur(net);
6520 struct nft_set_ext *ext;
6522 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
6523 ext = nft_set_elem_ext(set, catchall->elem);
6524 if (nft_set_elem_active(ext, genmask) &&
6525 !nft_set_elem_expired(ext) &&
6526 !nft_set_elem_is_dead(ext))
6532 EXPORT_SYMBOL_GPL(nft_set_catchall_lookup);
6534 static int nft_setelem_catchall_insert(const struct net *net,
6535 struct nft_set *set,
6536 const struct nft_set_elem *elem,
6537 struct nft_elem_priv **priv)
6539 struct nft_set_elem_catchall *catchall;
6540 u8 genmask = nft_genmask_next(net);
6541 struct nft_set_ext *ext;
6543 list_for_each_entry(catchall, &set->catchall_list, list) {
6544 ext = nft_set_elem_ext(set, catchall->elem);
6545 if (nft_set_elem_active(ext, genmask)) {
6546 *priv = catchall->elem;
6551 catchall = kmalloc(sizeof(*catchall), GFP_KERNEL);
6555 catchall->elem = elem->priv;
6556 list_add_tail_rcu(&catchall->list, &set->catchall_list);
6561 static int nft_setelem_insert(const struct net *net,
6562 struct nft_set *set,
6563 const struct nft_set_elem *elem,
6564 struct nft_elem_priv **elem_priv,
6569 if (flags & NFT_SET_ELEM_CATCHALL)
6570 ret = nft_setelem_catchall_insert(net, set, elem, elem_priv);
6572 ret = set->ops->insert(net, set, elem, elem_priv);
6577 static bool nft_setelem_is_catchall(const struct nft_set *set,
6578 const struct nft_elem_priv *elem_priv)
6580 struct nft_set_ext *ext = nft_set_elem_ext(set, elem_priv);
6582 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
6583 *nft_set_ext_flags(ext) & NFT_SET_ELEM_CATCHALL)
6589 static void nft_setelem_activate(struct net *net, struct nft_set *set,
6590 struct nft_elem_priv *elem_priv)
6592 struct nft_set_ext *ext = nft_set_elem_ext(set, elem_priv);
6594 if (nft_setelem_is_catchall(set, elem_priv)) {
6595 nft_set_elem_change_active(net, set, ext);
6597 set->ops->activate(net, set, elem_priv);
6601 static int nft_setelem_catchall_deactivate(const struct net *net,
6602 struct nft_set *set,
6603 struct nft_set_elem *elem)
6605 struct nft_set_elem_catchall *catchall;
6606 struct nft_set_ext *ext;
6608 list_for_each_entry(catchall, &set->catchall_list, list) {
6609 ext = nft_set_elem_ext(set, catchall->elem);
6610 if (!nft_is_active_next(net, ext))
6614 elem->priv = catchall->elem;
6615 nft_set_elem_change_active(net, set, ext);
6622 static int __nft_setelem_deactivate(const struct net *net,
6623 struct nft_set *set,
6624 struct nft_set_elem *elem)
6628 priv = set->ops->deactivate(net, set, elem);
6639 static int nft_setelem_deactivate(const struct net *net,
6640 struct nft_set *set,
6641 struct nft_set_elem *elem, u32 flags)
6645 if (flags & NFT_SET_ELEM_CATCHALL)
6646 ret = nft_setelem_catchall_deactivate(net, set, elem);
6648 ret = __nft_setelem_deactivate(net, set, elem);
6653 static void nft_setelem_catchall_destroy(struct nft_set_elem_catchall *catchall)
6655 list_del_rcu(&catchall->list);
6656 kfree_rcu(catchall, rcu);
6659 static void nft_setelem_catchall_remove(const struct net *net,
6660 const struct nft_set *set,
6661 struct nft_elem_priv *elem_priv)
6663 struct nft_set_elem_catchall *catchall, *next;
6665 list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
6666 if (catchall->elem == elem_priv) {
6667 nft_setelem_catchall_destroy(catchall);
6673 static void nft_setelem_remove(const struct net *net,
6674 const struct nft_set *set,
6675 struct nft_elem_priv *elem_priv)
6677 if (nft_setelem_is_catchall(set, elem_priv))
6678 nft_setelem_catchall_remove(net, set, elem_priv);
6680 set->ops->remove(net, set, elem_priv);
6683 static bool nft_setelem_valid_key_end(const struct nft_set *set,
6684 struct nlattr **nla, u32 flags)
6686 if ((set->flags & (NFT_SET_CONCAT | NFT_SET_INTERVAL)) ==
6687 (NFT_SET_CONCAT | NFT_SET_INTERVAL)) {
6688 if (flags & NFT_SET_ELEM_INTERVAL_END)
6691 if (nla[NFTA_SET_ELEM_KEY_END] &&
6692 flags & NFT_SET_ELEM_CATCHALL)
6695 if (nla[NFTA_SET_ELEM_KEY_END])
6702 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
6703 const struct nlattr *attr, u32 nlmsg_flags)
6705 struct nft_expr *expr_array[NFT_SET_EXPR_MAX] = {};
6706 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
6707 u8 genmask = nft_genmask_next(ctx->net);
6708 u32 flags = 0, size = 0, num_exprs = 0;
6709 struct nft_set_ext_tmpl tmpl;
6710 struct nft_set_ext *ext, *ext2;
6711 struct nft_set_elem elem;
6712 struct nft_set_binding *binding;
6713 struct nft_elem_priv *elem_priv;
6714 struct nft_object *obj = NULL;
6715 struct nft_userdata *udata;
6716 struct nft_data_desc desc;
6717 enum nft_registers dreg;
6718 struct nft_trans *trans;
6724 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
6725 nft_set_elem_policy, NULL);
6729 nft_set_ext_prepare(&tmpl);
6731 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
6735 if (((flags & NFT_SET_ELEM_CATCHALL) && nla[NFTA_SET_ELEM_KEY]) ||
6736 (!(flags & NFT_SET_ELEM_CATCHALL) && !nla[NFTA_SET_ELEM_KEY]))
6740 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
6745 if (set->flags & NFT_SET_MAP) {
6746 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
6747 !(flags & NFT_SET_ELEM_INTERVAL_END))
6750 if (nla[NFTA_SET_ELEM_DATA] != NULL)
6754 if (set->flags & NFT_SET_OBJECT) {
6755 if (!nla[NFTA_SET_ELEM_OBJREF] &&
6756 !(flags & NFT_SET_ELEM_INTERVAL_END))
6759 if (nla[NFTA_SET_ELEM_OBJREF])
6763 if (!nft_setelem_valid_key_end(set, nla, flags))
6766 if ((flags & NFT_SET_ELEM_INTERVAL_END) &&
6767 (nla[NFTA_SET_ELEM_DATA] ||
6768 nla[NFTA_SET_ELEM_OBJREF] ||
6769 nla[NFTA_SET_ELEM_TIMEOUT] ||
6770 nla[NFTA_SET_ELEM_EXPIRATION] ||
6771 nla[NFTA_SET_ELEM_USERDATA] ||
6772 nla[NFTA_SET_ELEM_EXPR] ||
6773 nla[NFTA_SET_ELEM_KEY_END] ||
6774 nla[NFTA_SET_ELEM_EXPRESSIONS]))
6778 if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
6779 if (!(set->flags & NFT_SET_TIMEOUT))
6781 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_TIMEOUT],
6785 } else if (set->flags & NFT_SET_TIMEOUT &&
6786 !(flags & NFT_SET_ELEM_INTERVAL_END)) {
6787 timeout = READ_ONCE(set->timeout);
6791 if (nla[NFTA_SET_ELEM_EXPIRATION] != NULL) {
6792 if (!(set->flags & NFT_SET_TIMEOUT))
6794 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_EXPIRATION],
6800 if (nla[NFTA_SET_ELEM_EXPR]) {
6801 struct nft_expr *expr;
6803 if (set->num_exprs && set->num_exprs != 1)
6806 expr = nft_set_elem_expr_alloc(ctx, set,
6807 nla[NFTA_SET_ELEM_EXPR]);
6809 return PTR_ERR(expr);
6811 expr_array[0] = expr;
6814 if (set->num_exprs && set->exprs[0]->ops != expr->ops) {
6816 goto err_set_elem_expr;
6818 } else if (nla[NFTA_SET_ELEM_EXPRESSIONS]) {
6819 struct nft_expr *expr;
6824 nla_for_each_nested(tmp, nla[NFTA_SET_ELEM_EXPRESSIONS], left) {
6825 if (i == NFT_SET_EXPR_MAX ||
6826 (set->num_exprs && set->num_exprs == i)) {
6828 goto err_set_elem_expr;
6830 if (nla_type(tmp) != NFTA_LIST_ELEM) {
6832 goto err_set_elem_expr;
6834 expr = nft_set_elem_expr_alloc(ctx, set, tmp);
6836 err = PTR_ERR(expr);
6837 goto err_set_elem_expr;
6839 expr_array[i] = expr;
6842 if (set->num_exprs && expr->ops != set->exprs[i]->ops) {
6844 goto err_set_elem_expr;
6848 if (set->num_exprs && set->num_exprs != i) {
6850 goto err_set_elem_expr;
6852 } else if (set->num_exprs > 0 &&
6853 !(flags & NFT_SET_ELEM_INTERVAL_END)) {
6854 err = nft_set_elem_expr_clone(ctx, set, expr_array);
6856 goto err_set_elem_expr_clone;
6858 num_exprs = set->num_exprs;
6861 if (nla[NFTA_SET_ELEM_KEY]) {
6862 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
6863 nla[NFTA_SET_ELEM_KEY]);
6865 goto err_set_elem_expr;
6867 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
6872 if (nla[NFTA_SET_ELEM_KEY_END]) {
6873 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
6874 nla[NFTA_SET_ELEM_KEY_END]);
6878 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
6880 goto err_parse_key_end;
6884 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
6886 goto err_parse_key_end;
6888 if (timeout != READ_ONCE(set->timeout)) {
6889 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
6891 goto err_parse_key_end;
6896 for (i = 0; i < num_exprs; i++)
6897 size += expr_array[i]->ops->size;
6899 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_EXPRESSIONS,
6900 sizeof(struct nft_set_elem_expr) + size);
6902 goto err_parse_key_end;
6905 if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
6906 obj = nft_obj_lookup(ctx->net, ctx->table,
6907 nla[NFTA_SET_ELEM_OBJREF],
6908 set->objtype, genmask);
6912 goto err_parse_key_end;
6915 if (!nft_use_inc(&obj->use)) {
6918 goto err_parse_key_end;
6921 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
6923 goto err_parse_key_end;
6926 if (nla[NFTA_SET_ELEM_DATA] != NULL) {
6927 err = nft_setelem_parse_data(ctx, set, &desc, &elem.data.val,
6928 nla[NFTA_SET_ELEM_DATA]);
6930 goto err_parse_key_end;
6932 dreg = nft_type_to_reg(set->dtype);
6933 list_for_each_entry(binding, &set->bindings, list) {
6934 struct nft_ctx bind_ctx = {
6936 .family = ctx->family,
6937 .table = ctx->table,
6938 .chain = (struct nft_chain *)binding->chain,
6941 if (!(binding->flags & NFT_SET_MAP))
6944 err = nft_validate_register_store(&bind_ctx, dreg,
6946 desc.type, desc.len);
6948 goto err_parse_data;
6950 if (desc.type == NFT_DATA_VERDICT &&
6951 (elem.data.val.verdict.code == NFT_GOTO ||
6952 elem.data.val.verdict.code == NFT_JUMP))
6953 nft_validate_state_update(ctx->table,
6957 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, desc.len);
6959 goto err_parse_data;
6962 /* The full maximum length of userdata can exceed the maximum
6963 * offset value (U8_MAX) for following extensions, therefor it
6964 * must be the last extension added.
6967 if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
6968 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
6970 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
6973 goto err_parse_data;
6977 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
6978 elem.key_end.val.data, elem.data.val.data,
6979 timeout, expiration, GFP_KERNEL_ACCOUNT);
6980 if (IS_ERR(elem.priv)) {
6981 err = PTR_ERR(elem.priv);
6982 goto err_parse_data;
6985 ext = nft_set_elem_ext(set, elem.priv);
6987 *nft_set_ext_flags(ext) = flags;
6990 *nft_set_ext_obj(ext) = obj;
6993 if (nft_set_ext_check(&tmpl, NFT_SET_EXT_USERDATA, ulen) < 0) {
6997 udata = nft_set_ext_userdata(ext);
6998 udata->len = ulen - 1;
6999 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
7001 err = nft_set_elem_expr_setup(ctx, &tmpl, ext, expr_array, num_exprs);
7005 trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
7006 if (trans == NULL) {
7011 ext->genmask = nft_genmask_cur(ctx->net);
7013 err = nft_setelem_insert(ctx->net, set, &elem, &elem_priv, flags);
7015 if (err == -EEXIST) {
7016 ext2 = nft_set_elem_ext(set, elem_priv);
7017 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^
7018 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) ||
7019 nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^
7020 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF))
7021 goto err_element_clash;
7022 if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
7023 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
7024 memcmp(nft_set_ext_data(ext),
7025 nft_set_ext_data(ext2), set->dlen) != 0) ||
7026 (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
7027 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
7028 *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
7029 goto err_element_clash;
7030 else if (!(nlmsg_flags & NLM_F_EXCL))
7032 } else if (err == -ENOTEMPTY) {
7033 /* ENOTEMPTY reports overlapping between this element
7034 * and an existing one.
7038 goto err_element_clash;
7041 if (!(flags & NFT_SET_ELEM_CATCHALL)) {
7042 unsigned int max = set->size ? set->size + set->ndeact : UINT_MAX;
7044 if (!atomic_add_unless(&set->nelems, 1, max)) {
7050 nft_trans_elem_priv(trans) = elem.priv;
7051 nft_trans_commit_list_add_tail(ctx->net, trans);
7055 nft_setelem_remove(ctx->net, set, elem.priv);
7059 nf_tables_set_elem_destroy(ctx, set, elem.priv);
7061 if (nla[NFTA_SET_ELEM_DATA] != NULL)
7062 nft_data_release(&elem.data.val, desc.type);
7065 nft_use_dec_restore(&obj->use);
7067 nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
7069 nft_data_release(&elem.key.val, NFT_DATA_VALUE);
7071 for (i = 0; i < num_exprs && expr_array[i]; i++)
7072 nft_expr_destroy(ctx, expr_array[i]);
7073 err_set_elem_expr_clone:
7077 static int nf_tables_newsetelem(struct sk_buff *skb,
7078 const struct nfnl_info *info,
7079 const struct nlattr * const nla[])
7081 struct netlink_ext_ack *extack = info->extack;
7082 u8 genmask = nft_genmask_next(info->net);
7083 u8 family = info->nfmsg->nfgen_family;
7084 struct net *net = info->net;
7085 const struct nlattr *attr;
7086 struct nft_table *table;
7087 struct nft_set *set;
7091 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
7094 table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
7095 genmask, NETLINK_CB(skb).portid);
7096 if (IS_ERR(table)) {
7097 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
7098 return PTR_ERR(table);
7101 set = nft_set_lookup_global(net, table, nla[NFTA_SET_ELEM_LIST_SET],
7102 nla[NFTA_SET_ELEM_LIST_SET_ID], genmask);
7104 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_SET]);
7105 return PTR_ERR(set);
7108 if (!list_empty(&set->bindings) &&
7109 (set->flags & (NFT_SET_CONSTANT | NFT_SET_ANONYMOUS)))
7112 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7114 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
7115 err = nft_add_set_elem(&ctx, set, attr, info->nlh->nlmsg_flags);
7117 NL_SET_BAD_ATTR(extack, attr);
7122 if (table->validate_state == NFT_VALIDATE_DO)
7123 return nft_table_validate(net, table);
7129 * nft_data_hold - hold a nft_data item
7131 * @data: struct nft_data to release
7132 * @type: type of data
7134 * Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded,
7135 * NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and
7136 * NFT_GOTO verdicts. This function must be called on active data objects
7137 * from the second phase of the commit protocol.
7139 void nft_data_hold(const struct nft_data *data, enum nft_data_types type)
7141 struct nft_chain *chain;
7143 if (type == NFT_DATA_VERDICT) {
7144 switch (data->verdict.code) {
7147 chain = data->verdict.chain;
7148 nft_use_inc_restore(&chain->use);
7154 static void nft_setelem_data_activate(const struct net *net,
7155 const struct nft_set *set,
7156 struct nft_elem_priv *elem_priv)
7158 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem_priv);
7160 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
7161 nft_data_hold(nft_set_ext_data(ext), set->dtype);
7162 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
7163 nft_use_inc_restore(&(*nft_set_ext_obj(ext))->use);
7166 void nft_setelem_data_deactivate(const struct net *net,
7167 const struct nft_set *set,
7168 struct nft_elem_priv *elem_priv)
7170 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem_priv);
7172 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
7173 nft_data_release(nft_set_ext_data(ext), set->dtype);
7174 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
7175 nft_use_dec(&(*nft_set_ext_obj(ext))->use);
7178 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
7179 const struct nlattr *attr)
7181 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
7182 struct nft_set_ext_tmpl tmpl;
7183 struct nft_set_elem elem;
7184 struct nft_set_ext *ext;
7185 struct nft_trans *trans;
7189 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
7190 nft_set_elem_policy, NULL);
7194 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
7198 if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
7201 if (!nft_setelem_valid_key_end(set, nla, flags))
7204 nft_set_ext_prepare(&tmpl);
7207 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
7212 if (nla[NFTA_SET_ELEM_KEY]) {
7213 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
7214 nla[NFTA_SET_ELEM_KEY]);
7218 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
7223 if (nla[NFTA_SET_ELEM_KEY_END]) {
7224 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
7225 nla[NFTA_SET_ELEM_KEY_END]);
7229 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
7231 goto fail_elem_key_end;
7235 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
7236 elem.key_end.val.data, NULL, 0, 0,
7237 GFP_KERNEL_ACCOUNT);
7238 if (IS_ERR(elem.priv)) {
7239 err = PTR_ERR(elem.priv);
7240 goto fail_elem_key_end;
7243 ext = nft_set_elem_ext(set, elem.priv);
7245 *nft_set_ext_flags(ext) = flags;
7247 trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
7251 err = nft_setelem_deactivate(ctx->net, set, &elem, flags);
7255 nft_setelem_data_deactivate(ctx->net, set, elem.priv);
7257 nft_trans_elem_priv(trans) = elem.priv;
7258 nft_trans_commit_list_add_tail(ctx->net, trans);
7266 nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
7268 nft_data_release(&elem.key.val, NFT_DATA_VALUE);
7272 static int nft_setelem_flush(const struct nft_ctx *ctx,
7273 struct nft_set *set,
7274 const struct nft_set_iter *iter,
7275 struct nft_elem_priv *elem_priv)
7277 struct nft_trans *trans;
7279 trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
7280 sizeof(struct nft_trans_elem), GFP_ATOMIC);
7284 set->ops->flush(ctx->net, set, elem_priv);
7287 nft_setelem_data_deactivate(ctx->net, set, elem_priv);
7288 nft_trans_elem_set(trans) = set;
7289 nft_trans_elem_priv(trans) = elem_priv;
7290 nft_trans_commit_list_add_tail(ctx->net, trans);
7295 static int __nft_set_catchall_flush(const struct nft_ctx *ctx,
7296 struct nft_set *set,
7297 struct nft_elem_priv *elem_priv)
7299 struct nft_trans *trans;
7301 trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
7302 sizeof(struct nft_trans_elem), GFP_KERNEL);
7306 nft_setelem_data_deactivate(ctx->net, set, elem_priv);
7307 nft_trans_elem_set(trans) = set;
7308 nft_trans_elem_priv(trans) = elem_priv;
7309 nft_trans_commit_list_add_tail(ctx->net, trans);
7314 static int nft_set_catchall_flush(const struct nft_ctx *ctx,
7315 struct nft_set *set)
7317 u8 genmask = nft_genmask_next(ctx->net);
7318 struct nft_set_elem_catchall *catchall;
7319 struct nft_set_ext *ext;
7322 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
7323 ext = nft_set_elem_ext(set, catchall->elem);
7324 if (!nft_set_elem_active(ext, genmask))
7327 ret = __nft_set_catchall_flush(ctx, set, catchall->elem);
7330 nft_set_elem_change_active(ctx->net, set, ext);
7336 static int nft_set_flush(struct nft_ctx *ctx, struct nft_set *set, u8 genmask)
7338 struct nft_set_iter iter = {
7340 .fn = nft_setelem_flush,
7343 set->ops->walk(ctx, set, &iter);
7345 iter.err = nft_set_catchall_flush(ctx, set);
7350 static int nf_tables_delsetelem(struct sk_buff *skb,
7351 const struct nfnl_info *info,
7352 const struct nlattr * const nla[])
7354 struct netlink_ext_ack *extack = info->extack;
7355 u8 genmask = nft_genmask_next(info->net);
7356 u8 family = info->nfmsg->nfgen_family;
7357 struct net *net = info->net;
7358 const struct nlattr *attr;
7359 struct nft_table *table;
7360 struct nft_set *set;
7364 table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
7365 genmask, NETLINK_CB(skb).portid);
7366 if (IS_ERR(table)) {
7367 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
7368 return PTR_ERR(table);
7371 set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
7373 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_SET]);
7374 return PTR_ERR(set);
7377 if (nft_set_is_anonymous(set))
7380 if (!list_empty(&set->bindings) && (set->flags & NFT_SET_CONSTANT))
7383 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7385 if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
7386 return nft_set_flush(&ctx, set, genmask);
7388 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
7389 err = nft_del_setelem(&ctx, set, attr);
7390 if (err == -ENOENT &&
7391 NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYSETELEM)
7395 NL_SET_BAD_ATTR(extack, attr);
7408 * nft_register_obj- register nf_tables stateful object type
7409 * @obj_type: object type
7411 * Registers the object type for use with nf_tables. Returns zero on
7412 * success or a negative errno code otherwise.
7414 int nft_register_obj(struct nft_object_type *obj_type)
7416 if (obj_type->type == NFT_OBJECT_UNSPEC)
7419 nfnl_lock(NFNL_SUBSYS_NFTABLES);
7420 list_add_rcu(&obj_type->list, &nf_tables_objects);
7421 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7424 EXPORT_SYMBOL_GPL(nft_register_obj);
7427 * nft_unregister_obj - unregister nf_tables object type
7428 * @obj_type: object type
7430 * Unregisters the object type for use with nf_tables.
7432 void nft_unregister_obj(struct nft_object_type *obj_type)
7434 nfnl_lock(NFNL_SUBSYS_NFTABLES);
7435 list_del_rcu(&obj_type->list);
7436 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7438 EXPORT_SYMBOL_GPL(nft_unregister_obj);
7440 struct nft_object *nft_obj_lookup(const struct net *net,
7441 const struct nft_table *table,
7442 const struct nlattr *nla, u32 objtype,
7445 struct nft_object_hash_key k = { .table = table };
7446 char search[NFT_OBJ_MAXNAMELEN];
7447 struct rhlist_head *tmp, *list;
7448 struct nft_object *obj;
7450 nla_strscpy(search, nla, sizeof(search));
7453 WARN_ON_ONCE(!rcu_read_lock_held() &&
7454 !lockdep_commit_lock_is_held(net));
7457 list = rhltable_lookup(&nft_objname_ht, &k, nft_objname_ht_params);
7461 rhl_for_each_entry_rcu(obj, tmp, list, rhlhead) {
7462 if (objtype == obj->ops->type->type &&
7463 nft_active_genmask(obj, genmask)) {
7470 return ERR_PTR(-ENOENT);
7472 EXPORT_SYMBOL_GPL(nft_obj_lookup);
7474 static struct nft_object *nft_obj_lookup_byhandle(const struct nft_table *table,
7475 const struct nlattr *nla,
7476 u32 objtype, u8 genmask)
7478 struct nft_object *obj;
7480 list_for_each_entry(obj, &table->objects, list) {
7481 if (be64_to_cpu(nla_get_be64(nla)) == obj->handle &&
7482 objtype == obj->ops->type->type &&
7483 nft_active_genmask(obj, genmask))
7486 return ERR_PTR(-ENOENT);
7489 static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
7490 [NFTA_OBJ_TABLE] = { .type = NLA_STRING,
7491 .len = NFT_TABLE_MAXNAMELEN - 1 },
7492 [NFTA_OBJ_NAME] = { .type = NLA_STRING,
7493 .len = NFT_OBJ_MAXNAMELEN - 1 },
7494 [NFTA_OBJ_TYPE] = { .type = NLA_U32 },
7495 [NFTA_OBJ_DATA] = { .type = NLA_NESTED },
7496 [NFTA_OBJ_HANDLE] = { .type = NLA_U64},
7497 [NFTA_OBJ_USERDATA] = { .type = NLA_BINARY,
7498 .len = NFT_USERDATA_MAXLEN },
7501 static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,
7502 const struct nft_object_type *type,
7503 const struct nlattr *attr)
7506 const struct nft_object_ops *ops;
7507 struct nft_object *obj;
7510 tb = kmalloc_array(type->maxattr + 1, sizeof(*tb), GFP_KERNEL);
7515 err = nla_parse_nested_deprecated(tb, type->maxattr, attr,
7516 type->policy, NULL);
7520 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
7523 if (type->select_ops) {
7524 ops = type->select_ops(ctx, (const struct nlattr * const *)tb);
7534 obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL_ACCOUNT);
7538 err = ops->init(ctx, (const struct nlattr * const *)tb, obj);
7551 return ERR_PTR(err);
7554 static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
7555 struct nft_object *obj, bool reset)
7557 struct nlattr *nest;
7559 nest = nla_nest_start_noflag(skb, attr);
7561 goto nla_put_failure;
7562 if (obj->ops->dump(skb, obj, reset) < 0)
7563 goto nla_put_failure;
7564 nla_nest_end(skb, nest);
7571 static const struct nft_object_type *__nft_obj_type_get(u32 objtype, u8 family)
7573 const struct nft_object_type *type;
7575 list_for_each_entry(type, &nf_tables_objects, list) {
7576 if (type->family != NFPROTO_UNSPEC &&
7577 type->family != family)
7580 if (objtype == type->type)
7586 static const struct nft_object_type *
7587 nft_obj_type_get(struct net *net, u32 objtype, u8 family)
7589 const struct nft_object_type *type;
7591 type = __nft_obj_type_get(objtype, family);
7592 if (type != NULL && try_module_get(type->owner))
7595 lockdep_nfnl_nft_mutex_not_held();
7596 #ifdef CONFIG_MODULES
7598 if (nft_request_module(net, "nft-obj-%u", objtype) == -EAGAIN)
7599 return ERR_PTR(-EAGAIN);
7602 return ERR_PTR(-ENOENT);
7605 static int nf_tables_updobj(const struct nft_ctx *ctx,
7606 const struct nft_object_type *type,
7607 const struct nlattr *attr,
7608 struct nft_object *obj)
7610 struct nft_object *newobj;
7611 struct nft_trans *trans;
7614 if (!try_module_get(type->owner))
7617 trans = nft_trans_alloc(ctx, NFT_MSG_NEWOBJ,
7618 sizeof(struct nft_trans_obj));
7622 newobj = nft_obj_init(ctx, type, attr);
7623 if (IS_ERR(newobj)) {
7624 err = PTR_ERR(newobj);
7625 goto err_free_trans;
7628 nft_trans_obj(trans) = obj;
7629 nft_trans_obj_update(trans) = true;
7630 nft_trans_obj_newobj(trans) = newobj;
7631 nft_trans_commit_list_add_tail(ctx->net, trans);
7638 module_put(type->owner);
7642 static int nf_tables_newobj(struct sk_buff *skb, const struct nfnl_info *info,
7643 const struct nlattr * const nla[])
7645 struct netlink_ext_ack *extack = info->extack;
7646 u8 genmask = nft_genmask_next(info->net);
7647 u8 family = info->nfmsg->nfgen_family;
7648 const struct nft_object_type *type;
7649 struct net *net = info->net;
7650 struct nft_table *table;
7651 struct nft_object *obj;
7656 if (!nla[NFTA_OBJ_TYPE] ||
7657 !nla[NFTA_OBJ_NAME] ||
7658 !nla[NFTA_OBJ_DATA])
7661 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
7662 NETLINK_CB(skb).portid);
7663 if (IS_ERR(table)) {
7664 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7665 return PTR_ERR(table);
7668 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7669 obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
7672 if (err != -ENOENT) {
7673 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7677 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
7678 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7681 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
7684 type = __nft_obj_type_get(objtype, family);
7685 if (WARN_ON_ONCE(!type))
7688 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7690 return nf_tables_updobj(&ctx, type, nla[NFTA_OBJ_DATA], obj);
7693 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7695 if (!nft_use_inc(&table->use))
7698 type = nft_obj_type_get(net, objtype, family);
7700 err = PTR_ERR(type);
7704 obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]);
7709 obj->key.table = table;
7710 obj->handle = nf_tables_alloc_handle(table);
7712 obj->key.name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL_ACCOUNT);
7713 if (!obj->key.name) {
7718 if (nla[NFTA_OBJ_USERDATA]) {
7719 obj->udata = nla_memdup(nla[NFTA_OBJ_USERDATA], GFP_KERNEL_ACCOUNT);
7720 if (obj->udata == NULL)
7723 obj->udlen = nla_len(nla[NFTA_OBJ_USERDATA]);
7726 err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
7730 err = rhltable_insert(&nft_objname_ht, &obj->rhlhead,
7731 nft_objname_ht_params);
7735 list_add_tail_rcu(&obj->list, &table->objects);
7739 /* queued in transaction log */
7740 INIT_LIST_HEAD(&obj->list);
7745 kfree(obj->key.name);
7747 if (obj->ops->destroy)
7748 obj->ops->destroy(&ctx, obj);
7751 module_put(type->owner);
7753 nft_use_dec_restore(&table->use);
7758 static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
7759 u32 portid, u32 seq, int event, u32 flags,
7760 int family, const struct nft_table *table,
7761 struct nft_object *obj, bool reset)
7763 struct nlmsghdr *nlh;
7765 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
7766 nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
7767 NFNETLINK_V0, nft_base_seq(net));
7769 goto nla_put_failure;
7771 if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
7772 nla_put_string(skb, NFTA_OBJ_NAME, obj->key.name) ||
7773 nla_put_be64(skb, NFTA_OBJ_HANDLE, cpu_to_be64(obj->handle),
7775 goto nla_put_failure;
7777 if (event == NFT_MSG_DELOBJ) {
7778 nlmsg_end(skb, nlh);
7782 if (nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) ||
7783 nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
7784 nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset))
7785 goto nla_put_failure;
7788 nla_put(skb, NFTA_OBJ_USERDATA, obj->udlen, obj->udata))
7789 goto nla_put_failure;
7791 nlmsg_end(skb, nlh);
7795 nlmsg_trim(skb, nlh);
7799 static void audit_log_obj_reset(const struct nft_table *table,
7800 unsigned int base_seq, unsigned int nentries)
7802 char *buf = kasprintf(GFP_ATOMIC, "%s:%u", table->name, base_seq);
7804 audit_log_nfcfg(buf, table->family, nentries,
7805 AUDIT_NFT_OP_OBJ_RESET, GFP_ATOMIC);
7809 struct nft_obj_dump_ctx {
7816 static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
7818 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
7819 struct nft_obj_dump_ctx *ctx = (void *)cb->ctx;
7820 struct net *net = sock_net(skb->sk);
7821 int family = nfmsg->nfgen_family;
7822 struct nftables_pernet *nft_net;
7823 const struct nft_table *table;
7824 unsigned int entries = 0;
7825 struct nft_object *obj;
7826 unsigned int idx = 0;
7830 nft_net = nft_pernet(net);
7831 cb->seq = READ_ONCE(nft_net->base_seq);
7833 list_for_each_entry_rcu(table, &nft_net->tables, list) {
7834 if (family != NFPROTO_UNSPEC && family != table->family)
7838 list_for_each_entry_rcu(obj, &table->objects, list) {
7839 if (!nft_is_active(net, obj))
7841 if (idx < ctx->s_idx)
7843 if (ctx->table && strcmp(ctx->table, table->name))
7845 if (ctx->type != NFT_OBJECT_UNSPEC &&
7846 obj->ops->type->type != ctx->type)
7849 rc = nf_tables_fill_obj_info(skb, net,
7850 NETLINK_CB(cb->skb).portid,
7853 NLM_F_MULTI | NLM_F_APPEND,
7854 table->family, table,
7860 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7864 if (ctx->reset && entries)
7865 audit_log_obj_reset(table, nft_net->base_seq, entries);
7875 static int nf_tables_dump_obj_start(struct netlink_callback *cb)
7877 struct nft_obj_dump_ctx *ctx = (void *)cb->ctx;
7878 const struct nlattr * const *nla = cb->data;
7880 BUILD_BUG_ON(sizeof(*ctx) > sizeof(cb->ctx));
7882 if (nla[NFTA_OBJ_TABLE]) {
7883 ctx->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_ATOMIC);
7888 if (nla[NFTA_OBJ_TYPE])
7889 ctx->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7891 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
7897 static int nf_tables_dump_obj_done(struct netlink_callback *cb)
7899 struct nft_obj_dump_ctx *ctx = (void *)cb->ctx;
7906 /* called with rcu_read_lock held */
7907 static int nf_tables_getobj(struct sk_buff *skb, const struct nfnl_info *info,
7908 const struct nlattr * const nla[])
7910 struct netlink_ext_ack *extack = info->extack;
7911 u8 genmask = nft_genmask_cur(info->net);
7912 u8 family = info->nfmsg->nfgen_family;
7913 const struct nft_table *table;
7914 struct net *net = info->net;
7915 struct nft_object *obj;
7916 struct sk_buff *skb2;
7921 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
7922 struct netlink_dump_control c = {
7923 .start = nf_tables_dump_obj_start,
7924 .dump = nf_tables_dump_obj,
7925 .done = nf_tables_dump_obj_done,
7926 .module = THIS_MODULE,
7927 .data = (void *)nla,
7930 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
7933 if (!nla[NFTA_OBJ_NAME] ||
7934 !nla[NFTA_OBJ_TYPE])
7937 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask, 0);
7938 if (IS_ERR(table)) {
7939 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7940 return PTR_ERR(table);
7943 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7944 obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
7946 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7947 return PTR_ERR(obj);
7950 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
7954 if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
7958 const struct nftables_pernet *nft_net;
7961 nft_net = nft_pernet(net);
7962 buf = kasprintf(GFP_ATOMIC, "%s:%u", table->name, nft_net->base_seq);
7964 audit_log_nfcfg(buf,
7967 AUDIT_NFT_OP_OBJ_RESET,
7972 err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
7973 info->nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
7974 family, table, obj, reset);
7976 goto err_fill_obj_info;
7978 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
7985 static void nft_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj)
7987 if (obj->ops->destroy)
7988 obj->ops->destroy(ctx, obj);
7990 module_put(obj->ops->type->owner);
7991 kfree(obj->key.name);
7996 static int nf_tables_delobj(struct sk_buff *skb, const struct nfnl_info *info,
7997 const struct nlattr * const nla[])
7999 struct netlink_ext_ack *extack = info->extack;
8000 u8 genmask = nft_genmask_next(info->net);
8001 u8 family = info->nfmsg->nfgen_family;
8002 struct net *net = info->net;
8003 const struct nlattr *attr;
8004 struct nft_table *table;
8005 struct nft_object *obj;
8009 if (!nla[NFTA_OBJ_TYPE] ||
8010 (!nla[NFTA_OBJ_NAME] && !nla[NFTA_OBJ_HANDLE]))
8013 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
8014 NETLINK_CB(skb).portid);
8015 if (IS_ERR(table)) {
8016 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
8017 return PTR_ERR(table);
8020 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
8021 if (nla[NFTA_OBJ_HANDLE]) {
8022 attr = nla[NFTA_OBJ_HANDLE];
8023 obj = nft_obj_lookup_byhandle(table, attr, objtype, genmask);
8025 attr = nla[NFTA_OBJ_NAME];
8026 obj = nft_obj_lookup(net, table, attr, objtype, genmask);
8030 if (PTR_ERR(obj) == -ENOENT &&
8031 NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYOBJ)
8034 NL_SET_BAD_ATTR(extack, attr);
8035 return PTR_ERR(obj);
8038 NL_SET_BAD_ATTR(extack, attr);
8042 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
8044 return nft_delobj(&ctx, obj);
8048 __nft_obj_notify(struct net *net, const struct nft_table *table,
8049 struct nft_object *obj, u32 portid, u32 seq, int event,
8050 u16 flags, int family, int report, gfp_t gfp)
8052 struct nftables_pernet *nft_net = nft_pernet(net);
8053 struct sk_buff *skb;
8057 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
8060 skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
8064 err = nf_tables_fill_obj_info(skb, net, portid, seq, event,
8065 flags & (NLM_F_CREATE | NLM_F_EXCL),
8066 family, table, obj, false);
8072 nft_notify_enqueue(skb, report, &nft_net->notify_list);
8075 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
8078 void nft_obj_notify(struct net *net, const struct nft_table *table,
8079 struct nft_object *obj, u32 portid, u32 seq, int event,
8080 u16 flags, int family, int report, gfp_t gfp)
8082 struct nftables_pernet *nft_net = nft_pernet(net);
8083 char *buf = kasprintf(gfp, "%s:%u",
8084 table->name, nft_net->base_seq);
8086 audit_log_nfcfg(buf,
8089 event == NFT_MSG_NEWOBJ ?
8090 AUDIT_NFT_OP_OBJ_REGISTER :
8091 AUDIT_NFT_OP_OBJ_UNREGISTER,
8095 __nft_obj_notify(net, table, obj, portid, seq, event,
8096 flags, family, report, gfp);
8098 EXPORT_SYMBOL_GPL(nft_obj_notify);
8100 static void nf_tables_obj_notify(const struct nft_ctx *ctx,
8101 struct nft_object *obj, int event)
8103 __nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid,
8104 ctx->seq, event, ctx->flags, ctx->family,
8105 ctx->report, GFP_KERNEL);
8111 void nft_register_flowtable_type(struct nf_flowtable_type *type)
8113 nfnl_lock(NFNL_SUBSYS_NFTABLES);
8114 list_add_tail_rcu(&type->list, &nf_tables_flowtables);
8115 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
8117 EXPORT_SYMBOL_GPL(nft_register_flowtable_type);
8119 void nft_unregister_flowtable_type(struct nf_flowtable_type *type)
8121 nfnl_lock(NFNL_SUBSYS_NFTABLES);
8122 list_del_rcu(&type->list);
8123 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
8125 EXPORT_SYMBOL_GPL(nft_unregister_flowtable_type);
8127 static const struct nla_policy nft_flowtable_policy[NFTA_FLOWTABLE_MAX + 1] = {
8128 [NFTA_FLOWTABLE_TABLE] = { .type = NLA_STRING,
8129 .len = NFT_NAME_MAXLEN - 1 },
8130 [NFTA_FLOWTABLE_NAME] = { .type = NLA_STRING,
8131 .len = NFT_NAME_MAXLEN - 1 },
8132 [NFTA_FLOWTABLE_HOOK] = { .type = NLA_NESTED },
8133 [NFTA_FLOWTABLE_HANDLE] = { .type = NLA_U64 },
8134 [NFTA_FLOWTABLE_FLAGS] = { .type = NLA_U32 },
8137 struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table,
8138 const struct nlattr *nla, u8 genmask)
8140 struct nft_flowtable *flowtable;
8142 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
8143 if (!nla_strcmp(nla, flowtable->name) &&
8144 nft_active_genmask(flowtable, genmask))
8147 return ERR_PTR(-ENOENT);
8149 EXPORT_SYMBOL_GPL(nft_flowtable_lookup);
8151 void nf_tables_deactivate_flowtable(const struct nft_ctx *ctx,
8152 struct nft_flowtable *flowtable,
8153 enum nft_trans_phase phase)
8156 case NFT_TRANS_PREPARE_ERROR:
8157 case NFT_TRANS_PREPARE:
8158 case NFT_TRANS_ABORT:
8159 case NFT_TRANS_RELEASE:
8160 nft_use_dec(&flowtable->use);
8166 EXPORT_SYMBOL_GPL(nf_tables_deactivate_flowtable);
8168 static struct nft_flowtable *
8169 nft_flowtable_lookup_byhandle(const struct nft_table *table,
8170 const struct nlattr *nla, u8 genmask)
8172 struct nft_flowtable *flowtable;
8174 list_for_each_entry(flowtable, &table->flowtables, list) {
8175 if (be64_to_cpu(nla_get_be64(nla)) == flowtable->handle &&
8176 nft_active_genmask(flowtable, genmask))
8179 return ERR_PTR(-ENOENT);
8182 struct nft_flowtable_hook {
8185 struct list_head list;
8188 static const struct nla_policy nft_flowtable_hook_policy[NFTA_FLOWTABLE_HOOK_MAX + 1] = {
8189 [NFTA_FLOWTABLE_HOOK_NUM] = { .type = NLA_U32 },
8190 [NFTA_FLOWTABLE_HOOK_PRIORITY] = { .type = NLA_U32 },
8191 [NFTA_FLOWTABLE_HOOK_DEVS] = { .type = NLA_NESTED },
8194 static int nft_flowtable_parse_hook(const struct nft_ctx *ctx,
8195 const struct nlattr * const nla[],
8196 struct nft_flowtable_hook *flowtable_hook,
8197 struct nft_flowtable *flowtable,
8198 struct netlink_ext_ack *extack, bool add)
8200 struct nlattr *tb[NFTA_FLOWTABLE_HOOK_MAX + 1];
8201 struct nft_hook *hook;
8202 int hooknum, priority;
8205 INIT_LIST_HEAD(&flowtable_hook->list);
8207 err = nla_parse_nested_deprecated(tb, NFTA_FLOWTABLE_HOOK_MAX,
8208 nla[NFTA_FLOWTABLE_HOOK],
8209 nft_flowtable_hook_policy, NULL);
8214 if (!tb[NFTA_FLOWTABLE_HOOK_NUM] ||
8215 !tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) {
8216 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
8220 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
8221 if (hooknum != NF_NETDEV_INGRESS)
8224 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
8226 flowtable_hook->priority = priority;
8227 flowtable_hook->num = hooknum;
8229 if (tb[NFTA_FLOWTABLE_HOOK_NUM]) {
8230 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
8231 if (hooknum != flowtable->hooknum)
8235 if (tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) {
8236 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
8237 if (priority != flowtable->data.priority)
8241 flowtable_hook->priority = flowtable->data.priority;
8242 flowtable_hook->num = flowtable->hooknum;
8245 if (tb[NFTA_FLOWTABLE_HOOK_DEVS]) {
8246 err = nf_tables_parse_netdev_hooks(ctx->net,
8247 tb[NFTA_FLOWTABLE_HOOK_DEVS],
8248 &flowtable_hook->list,
8254 list_for_each_entry(hook, &flowtable_hook->list, list) {
8255 hook->ops.pf = NFPROTO_NETDEV;
8256 hook->ops.hooknum = flowtable_hook->num;
8257 hook->ops.priority = flowtable_hook->priority;
8258 hook->ops.priv = &flowtable->data;
8259 hook->ops.hook = flowtable->data.type->hook;
8265 static const struct nf_flowtable_type *__nft_flowtable_type_get(u8 family)
8267 const struct nf_flowtable_type *type;
8269 list_for_each_entry(type, &nf_tables_flowtables, list) {
8270 if (family == type->family)
8276 static const struct nf_flowtable_type *
8277 nft_flowtable_type_get(struct net *net, u8 family)
8279 const struct nf_flowtable_type *type;
8281 type = __nft_flowtable_type_get(family);
8282 if (type != NULL && try_module_get(type->owner))
8285 lockdep_nfnl_nft_mutex_not_held();
8286 #ifdef CONFIG_MODULES
8288 if (nft_request_module(net, "nf-flowtable-%u", family) == -EAGAIN)
8289 return ERR_PTR(-EAGAIN);
8292 return ERR_PTR(-ENOENT);
8295 /* Only called from error and netdev event paths. */
8296 static void nft_unregister_flowtable_hook(struct net *net,
8297 struct nft_flowtable *flowtable,
8298 struct nft_hook *hook)
8300 nf_unregister_net_hook(net, &hook->ops);
8301 flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
8305 static void __nft_unregister_flowtable_net_hooks(struct net *net,
8306 struct list_head *hook_list,
8307 bool release_netdev)
8309 struct nft_hook *hook, *next;
8311 list_for_each_entry_safe(hook, next, hook_list, list) {
8312 nf_unregister_net_hook(net, &hook->ops);
8313 if (release_netdev) {
8314 list_del(&hook->list);
8315 kfree_rcu(hook, rcu);
8320 static void nft_unregister_flowtable_net_hooks(struct net *net,
8321 struct list_head *hook_list)
8323 __nft_unregister_flowtable_net_hooks(net, hook_list, false);
8326 static int nft_register_flowtable_net_hooks(struct net *net,
8327 struct nft_table *table,
8328 struct list_head *hook_list,
8329 struct nft_flowtable *flowtable)
8331 struct nft_hook *hook, *hook2, *next;
8332 struct nft_flowtable *ft;
8335 list_for_each_entry(hook, hook_list, list) {
8336 list_for_each_entry(ft, &table->flowtables, list) {
8337 if (!nft_is_active_next(net, ft))
8340 list_for_each_entry(hook2, &ft->hook_list, list) {
8341 if (hook->ops.dev == hook2->ops.dev &&
8342 hook->ops.pf == hook2->ops.pf) {
8344 goto err_unregister_net_hooks;
8349 err = flowtable->data.type->setup(&flowtable->data,
8353 goto err_unregister_net_hooks;
8355 err = nf_register_net_hook(net, &hook->ops);
8357 flowtable->data.type->setup(&flowtable->data,
8360 goto err_unregister_net_hooks;
8368 err_unregister_net_hooks:
8369 list_for_each_entry_safe(hook, next, hook_list, list) {
8373 nft_unregister_flowtable_hook(net, flowtable, hook);
8374 list_del_rcu(&hook->list);
8375 kfree_rcu(hook, rcu);
8381 static void nft_hooks_destroy(struct list_head *hook_list)
8383 struct nft_hook *hook, *next;
8385 list_for_each_entry_safe(hook, next, hook_list, list) {
8386 list_del_rcu(&hook->list);
8387 kfree_rcu(hook, rcu);
8391 static int nft_flowtable_update(struct nft_ctx *ctx, const struct nlmsghdr *nlh,
8392 struct nft_flowtable *flowtable,
8393 struct netlink_ext_ack *extack)
8395 const struct nlattr * const *nla = ctx->nla;
8396 struct nft_flowtable_hook flowtable_hook;
8397 struct nft_hook *hook, *next;
8398 struct nft_trans *trans;
8399 bool unregister = false;
8403 err = nft_flowtable_parse_hook(ctx, nla, &flowtable_hook, flowtable,
8408 list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
8409 if (nft_hook_list_find(&flowtable->hook_list, hook)) {
8410 list_del(&hook->list);
8415 if (nla[NFTA_FLOWTABLE_FLAGS]) {
8416 flags = ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
8417 if (flags & ~NFT_FLOWTABLE_MASK) {
8419 goto err_flowtable_update_hook;
8421 if ((flowtable->data.flags & NFT_FLOWTABLE_HW_OFFLOAD) ^
8422 (flags & NFT_FLOWTABLE_HW_OFFLOAD)) {
8424 goto err_flowtable_update_hook;
8427 flags = flowtable->data.flags;
8430 err = nft_register_flowtable_net_hooks(ctx->net, ctx->table,
8431 &flowtable_hook.list, flowtable);
8433 goto err_flowtable_update_hook;
8435 trans = nft_trans_alloc(ctx, NFT_MSG_NEWFLOWTABLE,
8436 sizeof(struct nft_trans_flowtable));
8440 goto err_flowtable_update_hook;
8443 nft_trans_flowtable_flags(trans) = flags;
8444 nft_trans_flowtable(trans) = flowtable;
8445 nft_trans_flowtable_update(trans) = true;
8446 INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
8447 list_splice(&flowtable_hook.list, &nft_trans_flowtable_hooks(trans));
8449 nft_trans_commit_list_add_tail(ctx->net, trans);
8453 err_flowtable_update_hook:
8454 list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
8456 nft_unregister_flowtable_hook(ctx->net, flowtable, hook);
8457 list_del_rcu(&hook->list);
8458 kfree_rcu(hook, rcu);
8465 static int nf_tables_newflowtable(struct sk_buff *skb,
8466 const struct nfnl_info *info,
8467 const struct nlattr * const nla[])
8469 struct netlink_ext_ack *extack = info->extack;
8470 struct nft_flowtable_hook flowtable_hook;
8471 u8 genmask = nft_genmask_next(info->net);
8472 u8 family = info->nfmsg->nfgen_family;
8473 const struct nf_flowtable_type *type;
8474 struct nft_flowtable *flowtable;
8475 struct net *net = info->net;
8476 struct nft_table *table;
8477 struct nft_trans *trans;
8481 if (!nla[NFTA_FLOWTABLE_TABLE] ||
8482 !nla[NFTA_FLOWTABLE_NAME] ||
8483 !nla[NFTA_FLOWTABLE_HOOK])
8486 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
8487 genmask, NETLINK_CB(skb).portid);
8488 if (IS_ERR(table)) {
8489 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
8490 return PTR_ERR(table);
8493 flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
8495 if (IS_ERR(flowtable)) {
8496 err = PTR_ERR(flowtable);
8497 if (err != -ENOENT) {
8498 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
8502 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
8503 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
8507 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
8509 return nft_flowtable_update(&ctx, info->nlh, flowtable, extack);
8512 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
8514 if (!nft_use_inc(&table->use))
8517 flowtable = kzalloc(sizeof(*flowtable), GFP_KERNEL_ACCOUNT);
8520 goto flowtable_alloc;
8523 flowtable->table = table;
8524 flowtable->handle = nf_tables_alloc_handle(table);
8525 INIT_LIST_HEAD(&flowtable->hook_list);
8527 flowtable->name = nla_strdup(nla[NFTA_FLOWTABLE_NAME], GFP_KERNEL_ACCOUNT);
8528 if (!flowtable->name) {
8533 type = nft_flowtable_type_get(net, family);
8535 err = PTR_ERR(type);
8539 if (nla[NFTA_FLOWTABLE_FLAGS]) {
8540 flowtable->data.flags =
8541 ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
8542 if (flowtable->data.flags & ~NFT_FLOWTABLE_MASK) {
8548 write_pnet(&flowtable->data.net, net);
8549 flowtable->data.type = type;
8550 err = type->init(&flowtable->data);
8554 err = nft_flowtable_parse_hook(&ctx, nla, &flowtable_hook, flowtable,
8557 goto err_flowtable_parse_hooks;
8559 list_splice(&flowtable_hook.list, &flowtable->hook_list);
8560 flowtable->data.priority = flowtable_hook.priority;
8561 flowtable->hooknum = flowtable_hook.num;
8563 trans = nft_trans_flowtable_add(&ctx, NFT_MSG_NEWFLOWTABLE, flowtable);
8564 if (IS_ERR(trans)) {
8565 err = PTR_ERR(trans);
8566 goto err_flowtable_trans;
8569 /* This must be LAST to ensure no packets are walking over this flowtable. */
8570 err = nft_register_flowtable_net_hooks(ctx.net, table,
8571 &flowtable->hook_list,
8574 goto err_flowtable_hooks;
8576 list_add_tail_rcu(&flowtable->list, &table->flowtables);
8580 err_flowtable_hooks:
8581 nft_trans_destroy(trans);
8582 err_flowtable_trans:
8583 nft_hooks_destroy(&flowtable->hook_list);
8584 err_flowtable_parse_hooks:
8585 flowtable->data.type->free(&flowtable->data);
8587 module_put(type->owner);
8589 kfree(flowtable->name);
8593 nft_use_dec_restore(&table->use);
8598 static void nft_flowtable_hook_release(struct nft_flowtable_hook *flowtable_hook)
8600 struct nft_hook *this, *next;
8602 list_for_each_entry_safe(this, next, &flowtable_hook->list, list) {
8603 list_del(&this->list);
8608 static int nft_delflowtable_hook(struct nft_ctx *ctx,
8609 struct nft_flowtable *flowtable,
8610 struct netlink_ext_ack *extack)
8612 const struct nlattr * const *nla = ctx->nla;
8613 struct nft_flowtable_hook flowtable_hook;
8614 LIST_HEAD(flowtable_del_list);
8615 struct nft_hook *this, *hook;
8616 struct nft_trans *trans;
8619 err = nft_flowtable_parse_hook(ctx, nla, &flowtable_hook, flowtable,
8624 list_for_each_entry(this, &flowtable_hook.list, list) {
8625 hook = nft_hook_list_find(&flowtable->hook_list, this);
8628 goto err_flowtable_del_hook;
8630 list_move(&hook->list, &flowtable_del_list);
8633 trans = nft_trans_alloc(ctx, NFT_MSG_DELFLOWTABLE,
8634 sizeof(struct nft_trans_flowtable));
8637 goto err_flowtable_del_hook;
8640 nft_trans_flowtable(trans) = flowtable;
8641 nft_trans_flowtable_update(trans) = true;
8642 INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
8643 list_splice(&flowtable_del_list, &nft_trans_flowtable_hooks(trans));
8644 nft_flowtable_hook_release(&flowtable_hook);
8646 nft_trans_commit_list_add_tail(ctx->net, trans);
8650 err_flowtable_del_hook:
8651 list_splice(&flowtable_del_list, &flowtable->hook_list);
8652 nft_flowtable_hook_release(&flowtable_hook);
8657 static int nf_tables_delflowtable(struct sk_buff *skb,
8658 const struct nfnl_info *info,
8659 const struct nlattr * const nla[])
8661 struct netlink_ext_ack *extack = info->extack;
8662 u8 genmask = nft_genmask_next(info->net);
8663 u8 family = info->nfmsg->nfgen_family;
8664 struct nft_flowtable *flowtable;
8665 struct net *net = info->net;
8666 const struct nlattr *attr;
8667 struct nft_table *table;
8670 if (!nla[NFTA_FLOWTABLE_TABLE] ||
8671 (!nla[NFTA_FLOWTABLE_NAME] &&
8672 !nla[NFTA_FLOWTABLE_HANDLE]))
8675 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
8676 genmask, NETLINK_CB(skb).portid);
8677 if (IS_ERR(table)) {
8678 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
8679 return PTR_ERR(table);
8682 if (nla[NFTA_FLOWTABLE_HANDLE]) {
8683 attr = nla[NFTA_FLOWTABLE_HANDLE];
8684 flowtable = nft_flowtable_lookup_byhandle(table, attr, genmask);
8686 attr = nla[NFTA_FLOWTABLE_NAME];
8687 flowtable = nft_flowtable_lookup(table, attr, genmask);
8690 if (IS_ERR(flowtable)) {
8691 if (PTR_ERR(flowtable) == -ENOENT &&
8692 NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYFLOWTABLE)
8695 NL_SET_BAD_ATTR(extack, attr);
8696 return PTR_ERR(flowtable);
8699 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
8701 if (nla[NFTA_FLOWTABLE_HOOK])
8702 return nft_delflowtable_hook(&ctx, flowtable, extack);
8704 if (flowtable->use > 0) {
8705 NL_SET_BAD_ATTR(extack, attr);
8709 return nft_delflowtable(&ctx, flowtable);
8712 static int nf_tables_fill_flowtable_info(struct sk_buff *skb, struct net *net,
8713 u32 portid, u32 seq, int event,
8714 u32 flags, int family,
8715 struct nft_flowtable *flowtable,
8716 struct list_head *hook_list)
8718 struct nlattr *nest, *nest_devs;
8719 struct nft_hook *hook;
8720 struct nlmsghdr *nlh;
8722 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
8723 nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
8724 NFNETLINK_V0, nft_base_seq(net));
8726 goto nla_put_failure;
8728 if (nla_put_string(skb, NFTA_FLOWTABLE_TABLE, flowtable->table->name) ||
8729 nla_put_string(skb, NFTA_FLOWTABLE_NAME, flowtable->name) ||
8730 nla_put_be64(skb, NFTA_FLOWTABLE_HANDLE, cpu_to_be64(flowtable->handle),
8731 NFTA_FLOWTABLE_PAD))
8732 goto nla_put_failure;
8734 if (event == NFT_MSG_DELFLOWTABLE && !hook_list) {
8735 nlmsg_end(skb, nlh);
8739 if (nla_put_be32(skb, NFTA_FLOWTABLE_USE, htonl(flowtable->use)) ||
8740 nla_put_be32(skb, NFTA_FLOWTABLE_FLAGS, htonl(flowtable->data.flags)))
8741 goto nla_put_failure;
8743 nest = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK);
8745 goto nla_put_failure;
8746 if (nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_NUM, htonl(flowtable->hooknum)) ||
8747 nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_PRIORITY, htonl(flowtable->data.priority)))
8748 goto nla_put_failure;
8750 nest_devs = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK_DEVS);
8752 goto nla_put_failure;
8755 hook_list = &flowtable->hook_list;
8757 list_for_each_entry_rcu(hook, hook_list, list) {
8758 if (nla_put_string(skb, NFTA_DEVICE_NAME, hook->ops.dev->name))
8759 goto nla_put_failure;
8761 nla_nest_end(skb, nest_devs);
8762 nla_nest_end(skb, nest);
8764 nlmsg_end(skb, nlh);
8768 nlmsg_trim(skb, nlh);
8772 struct nft_flowtable_filter {
8776 static int nf_tables_dump_flowtable(struct sk_buff *skb,
8777 struct netlink_callback *cb)
8779 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
8780 struct nft_flowtable_filter *filter = cb->data;
8781 unsigned int idx = 0, s_idx = cb->args[0];
8782 struct net *net = sock_net(skb->sk);
8783 int family = nfmsg->nfgen_family;
8784 struct nft_flowtable *flowtable;
8785 struct nftables_pernet *nft_net;
8786 const struct nft_table *table;
8789 nft_net = nft_pernet(net);
8790 cb->seq = READ_ONCE(nft_net->base_seq);
8792 list_for_each_entry_rcu(table, &nft_net->tables, list) {
8793 if (family != NFPROTO_UNSPEC && family != table->family)
8796 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
8797 if (!nft_is_active(net, flowtable))
8802 memset(&cb->args[1], 0,
8803 sizeof(cb->args) - sizeof(cb->args[0]));
8804 if (filter && filter->table &&
8805 strcmp(filter->table, table->name))
8808 if (nf_tables_fill_flowtable_info(skb, net, NETLINK_CB(cb->skb).portid,
8810 NFT_MSG_NEWFLOWTABLE,
8811 NLM_F_MULTI | NLM_F_APPEND,
8813 flowtable, NULL) < 0)
8816 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
8828 static int nf_tables_dump_flowtable_start(struct netlink_callback *cb)
8830 const struct nlattr * const *nla = cb->data;
8831 struct nft_flowtable_filter *filter = NULL;
8833 if (nla[NFTA_FLOWTABLE_TABLE]) {
8834 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
8838 filter->table = nla_strdup(nla[NFTA_FLOWTABLE_TABLE],
8840 if (!filter->table) {
8850 static int nf_tables_dump_flowtable_done(struct netlink_callback *cb)
8852 struct nft_flowtable_filter *filter = cb->data;
8857 kfree(filter->table);
8863 /* called with rcu_read_lock held */
8864 static int nf_tables_getflowtable(struct sk_buff *skb,
8865 const struct nfnl_info *info,
8866 const struct nlattr * const nla[])
8868 struct netlink_ext_ack *extack = info->extack;
8869 u8 genmask = nft_genmask_cur(info->net);
8870 u8 family = info->nfmsg->nfgen_family;
8871 struct nft_flowtable *flowtable;
8872 const struct nft_table *table;
8873 struct net *net = info->net;
8874 struct sk_buff *skb2;
8877 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
8878 struct netlink_dump_control c = {
8879 .start = nf_tables_dump_flowtable_start,
8880 .dump = nf_tables_dump_flowtable,
8881 .done = nf_tables_dump_flowtable_done,
8882 .module = THIS_MODULE,
8883 .data = (void *)nla,
8886 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
8889 if (!nla[NFTA_FLOWTABLE_NAME])
8892 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
8894 if (IS_ERR(table)) {
8895 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
8896 return PTR_ERR(table);
8899 flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
8901 if (IS_ERR(flowtable)) {
8902 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
8903 return PTR_ERR(flowtable);
8906 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
8910 err = nf_tables_fill_flowtable_info(skb2, net, NETLINK_CB(skb).portid,
8911 info->nlh->nlmsg_seq,
8912 NFT_MSG_NEWFLOWTABLE, 0, family,
8915 goto err_fill_flowtable_info;
8917 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
8919 err_fill_flowtable_info:
8924 static void nf_tables_flowtable_notify(struct nft_ctx *ctx,
8925 struct nft_flowtable *flowtable,
8926 struct list_head *hook_list, int event)
8928 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
8929 struct sk_buff *skb;
8934 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
8937 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
8941 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
8942 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
8944 err = nf_tables_fill_flowtable_info(skb, ctx->net, ctx->portid,
8945 ctx->seq, event, flags,
8946 ctx->family, flowtable, hook_list);
8952 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
8955 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
8958 static void nf_tables_flowtable_destroy(struct nft_flowtable *flowtable)
8960 struct nft_hook *hook, *next;
8962 flowtable->data.type->free(&flowtable->data);
8963 list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
8964 flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
8966 list_del_rcu(&hook->list);
8969 kfree(flowtable->name);
8970 module_put(flowtable->data.type->owner);
8974 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
8975 u32 portid, u32 seq)
8977 struct nftables_pernet *nft_net = nft_pernet(net);
8978 struct nlmsghdr *nlh;
8979 char buf[TASK_COMM_LEN];
8980 int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN);
8982 nlh = nfnl_msg_put(skb, portid, seq, event, 0, AF_UNSPEC,
8983 NFNETLINK_V0, nft_base_seq(net));
8985 goto nla_put_failure;
8987 if (nla_put_be32(skb, NFTA_GEN_ID, htonl(nft_net->base_seq)) ||
8988 nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) ||
8989 nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current)))
8990 goto nla_put_failure;
8992 nlmsg_end(skb, nlh);
8996 nlmsg_trim(skb, nlh);
9000 static void nft_flowtable_event(unsigned long event, struct net_device *dev,
9001 struct nft_flowtable *flowtable)
9003 struct nft_hook *hook;
9005 list_for_each_entry(hook, &flowtable->hook_list, list) {
9006 if (hook->ops.dev != dev)
9009 /* flow_offload_netdev_event() cleans up entries for us. */
9010 nft_unregister_flowtable_hook(dev_net(dev), flowtable, hook);
9011 list_del_rcu(&hook->list);
9012 kfree_rcu(hook, rcu);
9017 static int nf_tables_flowtable_event(struct notifier_block *this,
9018 unsigned long event, void *ptr)
9020 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
9021 struct nft_flowtable *flowtable;
9022 struct nftables_pernet *nft_net;
9023 struct nft_table *table;
9026 if (event != NETDEV_UNREGISTER)
9030 nft_net = nft_pernet(net);
9031 mutex_lock(&nft_net->commit_mutex);
9032 list_for_each_entry(table, &nft_net->tables, list) {
9033 list_for_each_entry(flowtable, &table->flowtables, list) {
9034 nft_flowtable_event(event, dev, flowtable);
9037 mutex_unlock(&nft_net->commit_mutex);
9042 static struct notifier_block nf_tables_flowtable_notifier = {
9043 .notifier_call = nf_tables_flowtable_event,
9046 static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
9049 struct nlmsghdr *nlh = nlmsg_hdr(skb);
9050 struct sk_buff *skb2;
9053 if (!nlmsg_report(nlh) &&
9054 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
9057 skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
9061 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
9068 nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
9069 nlmsg_report(nlh), GFP_KERNEL);
9072 nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
9076 static int nf_tables_getgen(struct sk_buff *skb, const struct nfnl_info *info,
9077 const struct nlattr * const nla[])
9079 struct sk_buff *skb2;
9082 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
9086 err = nf_tables_fill_gen_info(skb2, info->net, NETLINK_CB(skb).portid,
9087 info->nlh->nlmsg_seq);
9089 goto err_fill_gen_info;
9091 return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid);
9098 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
9099 [NFT_MSG_NEWTABLE] = {
9100 .call = nf_tables_newtable,
9101 .type = NFNL_CB_BATCH,
9102 .attr_count = NFTA_TABLE_MAX,
9103 .policy = nft_table_policy,
9105 [NFT_MSG_GETTABLE] = {
9106 .call = nf_tables_gettable,
9107 .type = NFNL_CB_RCU,
9108 .attr_count = NFTA_TABLE_MAX,
9109 .policy = nft_table_policy,
9111 [NFT_MSG_DELTABLE] = {
9112 .call = nf_tables_deltable,
9113 .type = NFNL_CB_BATCH,
9114 .attr_count = NFTA_TABLE_MAX,
9115 .policy = nft_table_policy,
9117 [NFT_MSG_DESTROYTABLE] = {
9118 .call = nf_tables_deltable,
9119 .type = NFNL_CB_BATCH,
9120 .attr_count = NFTA_TABLE_MAX,
9121 .policy = nft_table_policy,
9123 [NFT_MSG_NEWCHAIN] = {
9124 .call = nf_tables_newchain,
9125 .type = NFNL_CB_BATCH,
9126 .attr_count = NFTA_CHAIN_MAX,
9127 .policy = nft_chain_policy,
9129 [NFT_MSG_GETCHAIN] = {
9130 .call = nf_tables_getchain,
9131 .type = NFNL_CB_RCU,
9132 .attr_count = NFTA_CHAIN_MAX,
9133 .policy = nft_chain_policy,
9135 [NFT_MSG_DELCHAIN] = {
9136 .call = nf_tables_delchain,
9137 .type = NFNL_CB_BATCH,
9138 .attr_count = NFTA_CHAIN_MAX,
9139 .policy = nft_chain_policy,
9141 [NFT_MSG_DESTROYCHAIN] = {
9142 .call = nf_tables_delchain,
9143 .type = NFNL_CB_BATCH,
9144 .attr_count = NFTA_CHAIN_MAX,
9145 .policy = nft_chain_policy,
9147 [NFT_MSG_NEWRULE] = {
9148 .call = nf_tables_newrule,
9149 .type = NFNL_CB_BATCH,
9150 .attr_count = NFTA_RULE_MAX,
9151 .policy = nft_rule_policy,
9153 [NFT_MSG_GETRULE] = {
9154 .call = nf_tables_getrule,
9155 .type = NFNL_CB_RCU,
9156 .attr_count = NFTA_RULE_MAX,
9157 .policy = nft_rule_policy,
9159 [NFT_MSG_GETRULE_RESET] = {
9160 .call = nf_tables_getrule_reset,
9161 .type = NFNL_CB_RCU,
9162 .attr_count = NFTA_RULE_MAX,
9163 .policy = nft_rule_policy,
9165 [NFT_MSG_DELRULE] = {
9166 .call = nf_tables_delrule,
9167 .type = NFNL_CB_BATCH,
9168 .attr_count = NFTA_RULE_MAX,
9169 .policy = nft_rule_policy,
9171 [NFT_MSG_DESTROYRULE] = {
9172 .call = nf_tables_delrule,
9173 .type = NFNL_CB_BATCH,
9174 .attr_count = NFTA_RULE_MAX,
9175 .policy = nft_rule_policy,
9177 [NFT_MSG_NEWSET] = {
9178 .call = nf_tables_newset,
9179 .type = NFNL_CB_BATCH,
9180 .attr_count = NFTA_SET_MAX,
9181 .policy = nft_set_policy,
9183 [NFT_MSG_GETSET] = {
9184 .call = nf_tables_getset,
9185 .type = NFNL_CB_RCU,
9186 .attr_count = NFTA_SET_MAX,
9187 .policy = nft_set_policy,
9189 [NFT_MSG_DELSET] = {
9190 .call = nf_tables_delset,
9191 .type = NFNL_CB_BATCH,
9192 .attr_count = NFTA_SET_MAX,
9193 .policy = nft_set_policy,
9195 [NFT_MSG_DESTROYSET] = {
9196 .call = nf_tables_delset,
9197 .type = NFNL_CB_BATCH,
9198 .attr_count = NFTA_SET_MAX,
9199 .policy = nft_set_policy,
9201 [NFT_MSG_NEWSETELEM] = {
9202 .call = nf_tables_newsetelem,
9203 .type = NFNL_CB_BATCH,
9204 .attr_count = NFTA_SET_ELEM_LIST_MAX,
9205 .policy = nft_set_elem_list_policy,
9207 [NFT_MSG_GETSETELEM] = {
9208 .call = nf_tables_getsetelem,
9209 .type = NFNL_CB_RCU,
9210 .attr_count = NFTA_SET_ELEM_LIST_MAX,
9211 .policy = nft_set_elem_list_policy,
9213 [NFT_MSG_GETSETELEM_RESET] = {
9214 .call = nf_tables_getsetelem_reset,
9215 .type = NFNL_CB_RCU,
9216 .attr_count = NFTA_SET_ELEM_LIST_MAX,
9217 .policy = nft_set_elem_list_policy,
9219 [NFT_MSG_DELSETELEM] = {
9220 .call = nf_tables_delsetelem,
9221 .type = NFNL_CB_BATCH,
9222 .attr_count = NFTA_SET_ELEM_LIST_MAX,
9223 .policy = nft_set_elem_list_policy,
9225 [NFT_MSG_DESTROYSETELEM] = {
9226 .call = nf_tables_delsetelem,
9227 .type = NFNL_CB_BATCH,
9228 .attr_count = NFTA_SET_ELEM_LIST_MAX,
9229 .policy = nft_set_elem_list_policy,
9231 [NFT_MSG_GETGEN] = {
9232 .call = nf_tables_getgen,
9233 .type = NFNL_CB_RCU,
9235 [NFT_MSG_NEWOBJ] = {
9236 .call = nf_tables_newobj,
9237 .type = NFNL_CB_BATCH,
9238 .attr_count = NFTA_OBJ_MAX,
9239 .policy = nft_obj_policy,
9241 [NFT_MSG_GETOBJ] = {
9242 .call = nf_tables_getobj,
9243 .type = NFNL_CB_RCU,
9244 .attr_count = NFTA_OBJ_MAX,
9245 .policy = nft_obj_policy,
9247 [NFT_MSG_DELOBJ] = {
9248 .call = nf_tables_delobj,
9249 .type = NFNL_CB_BATCH,
9250 .attr_count = NFTA_OBJ_MAX,
9251 .policy = nft_obj_policy,
9253 [NFT_MSG_DESTROYOBJ] = {
9254 .call = nf_tables_delobj,
9255 .type = NFNL_CB_BATCH,
9256 .attr_count = NFTA_OBJ_MAX,
9257 .policy = nft_obj_policy,
9259 [NFT_MSG_GETOBJ_RESET] = {
9260 .call = nf_tables_getobj,
9261 .type = NFNL_CB_RCU,
9262 .attr_count = NFTA_OBJ_MAX,
9263 .policy = nft_obj_policy,
9265 [NFT_MSG_NEWFLOWTABLE] = {
9266 .call = nf_tables_newflowtable,
9267 .type = NFNL_CB_BATCH,
9268 .attr_count = NFTA_FLOWTABLE_MAX,
9269 .policy = nft_flowtable_policy,
9271 [NFT_MSG_GETFLOWTABLE] = {
9272 .call = nf_tables_getflowtable,
9273 .type = NFNL_CB_RCU,
9274 .attr_count = NFTA_FLOWTABLE_MAX,
9275 .policy = nft_flowtable_policy,
9277 [NFT_MSG_DELFLOWTABLE] = {
9278 .call = nf_tables_delflowtable,
9279 .type = NFNL_CB_BATCH,
9280 .attr_count = NFTA_FLOWTABLE_MAX,
9281 .policy = nft_flowtable_policy,
9283 [NFT_MSG_DESTROYFLOWTABLE] = {
9284 .call = nf_tables_delflowtable,
9285 .type = NFNL_CB_BATCH,
9286 .attr_count = NFTA_FLOWTABLE_MAX,
9287 .policy = nft_flowtable_policy,
9291 static int nf_tables_validate(struct net *net)
9293 struct nftables_pernet *nft_net = nft_pernet(net);
9294 struct nft_table *table;
9296 list_for_each_entry(table, &nft_net->tables, list) {
9297 switch (table->validate_state) {
9298 case NFT_VALIDATE_SKIP:
9300 case NFT_VALIDATE_NEED:
9301 nft_validate_state_update(table, NFT_VALIDATE_DO);
9303 case NFT_VALIDATE_DO:
9304 if (nft_table_validate(net, table) < 0)
9307 nft_validate_state_update(table, NFT_VALIDATE_SKIP);
9315 /* a drop policy has to be deferred until all rules have been activated,
9316 * otherwise a large ruleset that contains a drop-policy base chain will
9317 * cause all packets to get dropped until the full transaction has been
9320 * We defer the drop policy until the transaction has been finalized.
9322 static void nft_chain_commit_drop_policy(struct nft_trans *trans)
9324 struct nft_base_chain *basechain;
9326 if (nft_trans_chain_policy(trans) != NF_DROP)
9329 if (!nft_is_base_chain(trans->ctx.chain))
9332 basechain = nft_base_chain(trans->ctx.chain);
9333 basechain->policy = NF_DROP;
9336 static void nft_chain_commit_update(struct nft_trans *trans)
9338 struct nft_base_chain *basechain;
9340 if (nft_trans_chain_name(trans)) {
9341 rhltable_remove(&trans->ctx.table->chains_ht,
9342 &trans->ctx.chain->rhlhead,
9343 nft_chain_ht_params);
9344 swap(trans->ctx.chain->name, nft_trans_chain_name(trans));
9345 rhltable_insert_key(&trans->ctx.table->chains_ht,
9346 trans->ctx.chain->name,
9347 &trans->ctx.chain->rhlhead,
9348 nft_chain_ht_params);
9351 if (!nft_is_base_chain(trans->ctx.chain))
9354 nft_chain_stats_replace(trans);
9356 basechain = nft_base_chain(trans->ctx.chain);
9358 switch (nft_trans_chain_policy(trans)) {
9361 basechain->policy = nft_trans_chain_policy(trans);
9366 static void nft_obj_commit_update(struct nft_trans *trans)
9368 struct nft_object *newobj;
9369 struct nft_object *obj;
9371 obj = nft_trans_obj(trans);
9372 newobj = nft_trans_obj_newobj(trans);
9374 if (obj->ops->update)
9375 obj->ops->update(obj, newobj);
9377 nft_obj_destroy(&trans->ctx, newobj);
9380 static void nft_commit_release(struct nft_trans *trans)
9382 switch (trans->msg_type) {
9383 case NFT_MSG_DELTABLE:
9384 case NFT_MSG_DESTROYTABLE:
9385 nf_tables_table_destroy(&trans->ctx);
9387 case NFT_MSG_NEWCHAIN:
9388 free_percpu(nft_trans_chain_stats(trans));
9389 kfree(nft_trans_chain_name(trans));
9391 case NFT_MSG_DELCHAIN:
9392 case NFT_MSG_DESTROYCHAIN:
9393 if (nft_trans_chain_update(trans))
9394 nft_hooks_destroy(&nft_trans_chain_hooks(trans));
9396 nf_tables_chain_destroy(&trans->ctx);
9398 case NFT_MSG_DELRULE:
9399 case NFT_MSG_DESTROYRULE:
9400 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
9402 case NFT_MSG_DELSET:
9403 case NFT_MSG_DESTROYSET:
9404 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
9406 case NFT_MSG_DELSETELEM:
9407 case NFT_MSG_DESTROYSETELEM:
9408 nf_tables_set_elem_destroy(&trans->ctx,
9409 nft_trans_elem_set(trans),
9410 nft_trans_elem_priv(trans));
9412 case NFT_MSG_DELOBJ:
9413 case NFT_MSG_DESTROYOBJ:
9414 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
9416 case NFT_MSG_DELFLOWTABLE:
9417 case NFT_MSG_DESTROYFLOWTABLE:
9418 if (nft_trans_flowtable_update(trans))
9419 nft_hooks_destroy(&nft_trans_flowtable_hooks(trans));
9421 nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
9426 put_net(trans->ctx.net);
9431 static void nf_tables_trans_destroy_work(struct work_struct *w)
9433 struct nft_trans *trans, *next;
9436 spin_lock(&nf_tables_destroy_list_lock);
9437 list_splice_init(&nf_tables_destroy_list, &head);
9438 spin_unlock(&nf_tables_destroy_list_lock);
9440 if (list_empty(&head))
9445 list_for_each_entry_safe(trans, next, &head, list) {
9446 nft_trans_list_del(trans);
9447 nft_commit_release(trans);
9451 void nf_tables_trans_destroy_flush_work(void)
9453 flush_work(&trans_destroy_work);
9455 EXPORT_SYMBOL_GPL(nf_tables_trans_destroy_flush_work);
9457 static bool nft_expr_reduce(struct nft_regs_track *track,
9458 const struct nft_expr *expr)
9463 static int nf_tables_commit_chain_prepare(struct net *net, struct nft_chain *chain)
9465 const struct nft_expr *expr, *last;
9466 struct nft_regs_track track = {};
9467 unsigned int size, data_size;
9468 void *data, *data_boundary;
9469 struct nft_rule_dp *prule;
9470 struct nft_rule *rule;
9472 /* already handled or inactive chain? */
9473 if (chain->blob_next || !nft_is_active_next(net, chain))
9477 list_for_each_entry(rule, &chain->rules, list) {
9478 if (nft_is_active_next(net, rule)) {
9479 data_size += sizeof(*prule) + rule->dlen;
9480 if (data_size > INT_MAX)
9485 chain->blob_next = nf_tables_chain_alloc_rules(chain, data_size);
9486 if (!chain->blob_next)
9489 data = (void *)chain->blob_next->data;
9490 data_boundary = data + data_size;
9493 list_for_each_entry(rule, &chain->rules, list) {
9494 if (!nft_is_active_next(net, rule))
9497 prule = (struct nft_rule_dp *)data;
9498 data += offsetof(struct nft_rule_dp, data);
9499 if (WARN_ON_ONCE(data > data_boundary))
9503 track.last = nft_expr_last(rule);
9504 nft_rule_for_each_expr(expr, last, rule) {
9507 if (nft_expr_reduce(&track, expr)) {
9512 if (WARN_ON_ONCE(data + size + expr->ops->size > data_boundary))
9515 memcpy(data + size, expr, expr->ops->size);
9516 size += expr->ops->size;
9518 if (WARN_ON_ONCE(size >= 1 << 12))
9521 prule->handle = rule->handle;
9527 chain->blob_next->size += (unsigned long)(data - (void *)prule);
9530 if (WARN_ON_ONCE(data > data_boundary))
9533 prule = (struct nft_rule_dp *)data;
9534 nft_last_rule(chain, prule);
9539 static void nf_tables_commit_chain_prepare_cancel(struct net *net)
9541 struct nftables_pernet *nft_net = nft_pernet(net);
9542 struct nft_trans *trans, *next;
9544 list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
9545 struct nft_chain *chain = trans->ctx.chain;
9547 if (trans->msg_type == NFT_MSG_NEWRULE ||
9548 trans->msg_type == NFT_MSG_DELRULE) {
9549 kvfree(chain->blob_next);
9550 chain->blob_next = NULL;
9555 static void __nf_tables_commit_chain_free_rules(struct rcu_head *h)
9557 struct nft_rule_dp_last *l = container_of(h, struct nft_rule_dp_last, h);
9562 static void nf_tables_commit_chain_free_rules_old(struct nft_rule_blob *blob)
9564 struct nft_rule_dp_last *last;
9566 /* last rule trailer is after end marker */
9567 last = (void *)blob + sizeof(*blob) + blob->size;
9570 call_rcu(&last->h, __nf_tables_commit_chain_free_rules);
9573 static void nf_tables_commit_chain(struct net *net, struct nft_chain *chain)
9575 struct nft_rule_blob *g0, *g1;
9578 next_genbit = nft_gencursor_next(net);
9580 g0 = rcu_dereference_protected(chain->blob_gen_0,
9581 lockdep_commit_lock_is_held(net));
9582 g1 = rcu_dereference_protected(chain->blob_gen_1,
9583 lockdep_commit_lock_is_held(net));
9585 /* No changes to this chain? */
9586 if (chain->blob_next == NULL) {
9587 /* chain had no change in last or next generation */
9591 * chain had no change in this generation; make sure next
9592 * one uses same rules as current generation.
9595 rcu_assign_pointer(chain->blob_gen_1, g0);
9596 nf_tables_commit_chain_free_rules_old(g1);
9598 rcu_assign_pointer(chain->blob_gen_0, g1);
9599 nf_tables_commit_chain_free_rules_old(g0);
9606 rcu_assign_pointer(chain->blob_gen_1, chain->blob_next);
9608 rcu_assign_pointer(chain->blob_gen_0, chain->blob_next);
9610 chain->blob_next = NULL;
9616 nf_tables_commit_chain_free_rules_old(g1);
9618 nf_tables_commit_chain_free_rules_old(g0);
9621 static void nft_obj_del(struct nft_object *obj)
9623 rhltable_remove(&nft_objname_ht, &obj->rhlhead, nft_objname_ht_params);
9624 list_del_rcu(&obj->list);
9627 void nft_chain_del(struct nft_chain *chain)
9629 struct nft_table *table = chain->table;
9631 WARN_ON_ONCE(rhltable_remove(&table->chains_ht, &chain->rhlhead,
9632 nft_chain_ht_params));
9633 list_del_rcu(&chain->list);
9636 static void nft_trans_gc_setelem_remove(struct nft_ctx *ctx,
9637 struct nft_trans_gc *trans)
9639 struct nft_elem_priv **priv = trans->priv;
9642 for (i = 0; i < trans->count; i++) {
9643 nft_setelem_data_deactivate(ctx->net, trans->set, priv[i]);
9644 nft_setelem_remove(ctx->net, trans->set, priv[i]);
9648 void nft_trans_gc_destroy(struct nft_trans_gc *trans)
9650 nft_set_put(trans->set);
9651 put_net(trans->net);
9655 static void nft_trans_gc_trans_free(struct rcu_head *rcu)
9657 struct nft_elem_priv *elem_priv;
9658 struct nft_trans_gc *trans;
9659 struct nft_ctx ctx = {};
9662 trans = container_of(rcu, struct nft_trans_gc, rcu);
9663 ctx.net = read_pnet(&trans->set->net);
9665 for (i = 0; i < trans->count; i++) {
9666 elem_priv = trans->priv[i];
9667 if (!nft_setelem_is_catchall(trans->set, elem_priv))
9668 atomic_dec(&trans->set->nelems);
9670 nf_tables_set_elem_destroy(&ctx, trans->set, elem_priv);
9673 nft_trans_gc_destroy(trans);
9676 static bool nft_trans_gc_work_done(struct nft_trans_gc *trans)
9678 struct nftables_pernet *nft_net;
9679 struct nft_ctx ctx = {};
9681 nft_net = nft_pernet(trans->net);
9683 mutex_lock(&nft_net->commit_mutex);
9685 /* Check for race with transaction, otherwise this batch refers to
9686 * stale objects that might not be there anymore. Skip transaction if
9687 * set has been destroyed from control plane transaction in case gc
9688 * worker loses race.
9690 if (READ_ONCE(nft_net->gc_seq) != trans->seq || trans->set->dead) {
9691 mutex_unlock(&nft_net->commit_mutex);
9695 ctx.net = trans->net;
9696 ctx.table = trans->set->table;
9698 nft_trans_gc_setelem_remove(&ctx, trans);
9699 mutex_unlock(&nft_net->commit_mutex);
9704 static void nft_trans_gc_work(struct work_struct *work)
9706 struct nft_trans_gc *trans, *next;
9707 LIST_HEAD(trans_gc_list);
9709 spin_lock(&nf_tables_gc_list_lock);
9710 list_splice_init(&nf_tables_gc_list, &trans_gc_list);
9711 spin_unlock(&nf_tables_gc_list_lock);
9713 list_for_each_entry_safe(trans, next, &trans_gc_list, list) {
9714 list_del(&trans->list);
9715 if (!nft_trans_gc_work_done(trans)) {
9716 nft_trans_gc_destroy(trans);
9719 call_rcu(&trans->rcu, nft_trans_gc_trans_free);
9723 struct nft_trans_gc *nft_trans_gc_alloc(struct nft_set *set,
9724 unsigned int gc_seq, gfp_t gfp)
9726 struct net *net = read_pnet(&set->net);
9727 struct nft_trans_gc *trans;
9729 trans = kzalloc(sizeof(*trans), gfp);
9733 trans->net = maybe_get_net(net);
9739 refcount_inc(&set->refs);
9741 trans->seq = gc_seq;
9746 void nft_trans_gc_elem_add(struct nft_trans_gc *trans, void *priv)
9748 trans->priv[trans->count++] = priv;
9751 static void nft_trans_gc_queue_work(struct nft_trans_gc *trans)
9753 spin_lock(&nf_tables_gc_list_lock);
9754 list_add_tail(&trans->list, &nf_tables_gc_list);
9755 spin_unlock(&nf_tables_gc_list_lock);
9757 schedule_work(&trans_gc_work);
9760 static int nft_trans_gc_space(struct nft_trans_gc *trans)
9762 return NFT_TRANS_GC_BATCHCOUNT - trans->count;
9765 struct nft_trans_gc *nft_trans_gc_queue_async(struct nft_trans_gc *gc,
9766 unsigned int gc_seq, gfp_t gfp)
9768 struct nft_set *set;
9770 if (nft_trans_gc_space(gc))
9774 nft_trans_gc_queue_work(gc);
9776 return nft_trans_gc_alloc(set, gc_seq, gfp);
9779 void nft_trans_gc_queue_async_done(struct nft_trans_gc *trans)
9781 if (trans->count == 0) {
9782 nft_trans_gc_destroy(trans);
9786 nft_trans_gc_queue_work(trans);
9789 struct nft_trans_gc *nft_trans_gc_queue_sync(struct nft_trans_gc *gc, gfp_t gfp)
9791 struct nft_set *set;
9793 if (WARN_ON_ONCE(!lockdep_commit_lock_is_held(gc->net)))
9796 if (nft_trans_gc_space(gc))
9800 call_rcu(&gc->rcu, nft_trans_gc_trans_free);
9802 return nft_trans_gc_alloc(set, 0, gfp);
9805 void nft_trans_gc_queue_sync_done(struct nft_trans_gc *trans)
9807 WARN_ON_ONCE(!lockdep_commit_lock_is_held(trans->net));
9809 if (trans->count == 0) {
9810 nft_trans_gc_destroy(trans);
9814 call_rcu(&trans->rcu, nft_trans_gc_trans_free);
9817 struct nft_trans_gc *nft_trans_gc_catchall_async(struct nft_trans_gc *gc,
9818 unsigned int gc_seq)
9820 struct nft_set_elem_catchall *catchall;
9821 const struct nft_set *set = gc->set;
9822 struct nft_set_ext *ext;
9824 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
9825 ext = nft_set_elem_ext(set, catchall->elem);
9827 if (!nft_set_elem_expired(ext))
9829 if (nft_set_elem_is_dead(ext))
9832 nft_set_elem_dead(ext);
9834 gc = nft_trans_gc_queue_async(gc, gc_seq, GFP_ATOMIC);
9838 nft_trans_gc_elem_add(gc, catchall->elem);
9844 struct nft_trans_gc *nft_trans_gc_catchall_sync(struct nft_trans_gc *gc)
9846 struct nft_set_elem_catchall *catchall, *next;
9847 u64 tstamp = nft_net_tstamp(gc->net);
9848 const struct nft_set *set = gc->set;
9849 struct nft_elem_priv *elem_priv;
9850 struct nft_set_ext *ext;
9852 WARN_ON_ONCE(!lockdep_commit_lock_is_held(gc->net));
9854 list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
9855 ext = nft_set_elem_ext(set, catchall->elem);
9857 if (!__nft_set_elem_expired(ext, tstamp))
9860 gc = nft_trans_gc_queue_sync(gc, GFP_KERNEL);
9864 elem_priv = catchall->elem;
9865 nft_setelem_data_deactivate(gc->net, gc->set, elem_priv);
9866 nft_setelem_catchall_destroy(catchall);
9867 nft_trans_gc_elem_add(gc, elem_priv);
9873 static void nf_tables_module_autoload_cleanup(struct net *net)
9875 struct nftables_pernet *nft_net = nft_pernet(net);
9876 struct nft_module_request *req, *next;
9878 WARN_ON_ONCE(!list_empty(&nft_net->commit_list));
9879 list_for_each_entry_safe(req, next, &nft_net->module_list, list) {
9880 WARN_ON_ONCE(!req->done);
9881 list_del(&req->list);
9886 static void nf_tables_commit_release(struct net *net)
9888 struct nftables_pernet *nft_net = nft_pernet(net);
9889 struct nft_trans *trans;
9891 /* all side effects have to be made visible.
9892 * For example, if a chain named 'foo' has been deleted, a
9893 * new transaction must not find it anymore.
9895 * Memory reclaim happens asynchronously from work queue
9896 * to prevent expensive synchronize_rcu() in commit phase.
9898 if (list_empty(&nft_net->commit_list)) {
9899 nf_tables_module_autoload_cleanup(net);
9900 mutex_unlock(&nft_net->commit_mutex);
9904 trans = list_last_entry(&nft_net->commit_list,
9905 struct nft_trans, list);
9906 get_net(trans->ctx.net);
9907 WARN_ON_ONCE(trans->put_net);
9909 trans->put_net = true;
9910 spin_lock(&nf_tables_destroy_list_lock);
9911 list_splice_tail_init(&nft_net->commit_list, &nf_tables_destroy_list);
9912 spin_unlock(&nf_tables_destroy_list_lock);
9914 nf_tables_module_autoload_cleanup(net);
9915 schedule_work(&trans_destroy_work);
9917 mutex_unlock(&nft_net->commit_mutex);
9920 static void nft_commit_notify(struct net *net, u32 portid)
9922 struct nftables_pernet *nft_net = nft_pernet(net);
9923 struct sk_buff *batch_skb = NULL, *nskb, *skb;
9924 unsigned char *data;
9927 list_for_each_entry_safe(skb, nskb, &nft_net->notify_list, list) {
9931 len = NLMSG_GOODSIZE - skb->len;
9932 list_del(&skb->list);
9936 if (len > 0 && NFT_CB(skb).report == NFT_CB(batch_skb).report) {
9937 data = skb_put(batch_skb, skb->len);
9938 memcpy(data, skb->data, skb->len);
9939 list_del(&skb->list);
9943 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
9944 NFT_CB(batch_skb).report, GFP_KERNEL);
9949 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
9950 NFT_CB(batch_skb).report, GFP_KERNEL);
9953 WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
9956 static int nf_tables_commit_audit_alloc(struct list_head *adl,
9957 struct nft_table *table)
9959 struct nft_audit_data *adp;
9961 list_for_each_entry(adp, adl, list) {
9962 if (adp->table == table)
9965 adp = kzalloc(sizeof(*adp), GFP_KERNEL);
9969 list_add(&adp->list, adl);
9973 static void nf_tables_commit_audit_free(struct list_head *adl)
9975 struct nft_audit_data *adp, *adn;
9977 list_for_each_entry_safe(adp, adn, adl, list) {
9978 list_del(&adp->list);
9983 static void nf_tables_commit_audit_collect(struct list_head *adl,
9984 struct nft_table *table, u32 op)
9986 struct nft_audit_data *adp;
9988 list_for_each_entry(adp, adl, list) {
9989 if (adp->table == table)
9992 WARN_ONCE(1, "table=%s not expected in commit list", table->name);
9996 if (!adp->op || adp->op > op)
10000 #define AUNFTABLENAMELEN (NFT_TABLE_MAXNAMELEN + 22)
10002 static void nf_tables_commit_audit_log(struct list_head *adl, u32 generation)
10004 struct nft_audit_data *adp, *adn;
10005 char aubuf[AUNFTABLENAMELEN];
10007 list_for_each_entry_safe(adp, adn, adl, list) {
10008 snprintf(aubuf, AUNFTABLENAMELEN, "%s:%u", adp->table->name,
10010 audit_log_nfcfg(aubuf, adp->table->family, adp->entries,
10011 nft2audit_op[adp->op], GFP_KERNEL);
10012 list_del(&adp->list);
10017 static void nft_set_commit_update(struct list_head *set_update_list)
10019 struct nft_set *set, *next;
10021 list_for_each_entry_safe(set, next, set_update_list, pending_update) {
10022 list_del_init(&set->pending_update);
10024 if (!set->ops->commit || set->dead)
10027 set->ops->commit(set);
10031 static unsigned int nft_gc_seq_begin(struct nftables_pernet *nft_net)
10033 unsigned int gc_seq;
10035 /* Bump gc counter, it becomes odd, this is the busy mark. */
10036 gc_seq = READ_ONCE(nft_net->gc_seq);
10037 WRITE_ONCE(nft_net->gc_seq, ++gc_seq);
10042 static void nft_gc_seq_end(struct nftables_pernet *nft_net, unsigned int gc_seq)
10044 WRITE_ONCE(nft_net->gc_seq, ++gc_seq);
10047 static int nf_tables_commit(struct net *net, struct sk_buff *skb)
10049 struct nftables_pernet *nft_net = nft_pernet(net);
10050 struct nft_trans *trans, *next;
10051 unsigned int base_seq, gc_seq;
10052 LIST_HEAD(set_update_list);
10053 struct nft_trans_elem *te;
10054 struct nft_chain *chain;
10055 struct nft_table *table;
10059 if (list_empty(&nft_net->commit_list)) {
10060 mutex_unlock(&nft_net->commit_mutex);
10064 list_for_each_entry(trans, &nft_net->binding_list, binding_list) {
10065 switch (trans->msg_type) {
10066 case NFT_MSG_NEWSET:
10067 if (!nft_trans_set_update(trans) &&
10068 nft_set_is_anonymous(nft_trans_set(trans)) &&
10069 !nft_trans_set_bound(trans)) {
10070 pr_warn_once("nftables ruleset with unbound set\n");
10074 case NFT_MSG_NEWCHAIN:
10075 if (!nft_trans_chain_update(trans) &&
10076 nft_chain_binding(nft_trans_chain(trans)) &&
10077 !nft_trans_chain_bound(trans)) {
10078 pr_warn_once("nftables ruleset with unbound chain\n");
10085 /* 0. Validate ruleset, otherwise roll back for error reporting. */
10086 if (nf_tables_validate(net) < 0) {
10087 nft_net->validate_state = NFT_VALIDATE_DO;
10091 err = nft_flow_rule_offload_commit(net);
10095 /* 1. Allocate space for next generation rules_gen_X[] */
10096 list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
10099 ret = nf_tables_commit_audit_alloc(&adl, trans->ctx.table);
10101 nf_tables_commit_chain_prepare_cancel(net);
10102 nf_tables_commit_audit_free(&adl);
10105 if (trans->msg_type == NFT_MSG_NEWRULE ||
10106 trans->msg_type == NFT_MSG_DELRULE) {
10107 chain = trans->ctx.chain;
10109 ret = nf_tables_commit_chain_prepare(net, chain);
10111 nf_tables_commit_chain_prepare_cancel(net);
10112 nf_tables_commit_audit_free(&adl);
10118 /* step 2. Make rules_gen_X visible to packet path */
10119 list_for_each_entry(table, &nft_net->tables, list) {
10120 list_for_each_entry(chain, &table->chains, list)
10121 nf_tables_commit_chain(net, chain);
10125 * Bump generation counter, invalidate any dump in progress.
10126 * Cannot fail after this point.
10128 base_seq = READ_ONCE(nft_net->base_seq);
10129 while (++base_seq == 0)
10132 WRITE_ONCE(nft_net->base_seq, base_seq);
10134 gc_seq = nft_gc_seq_begin(nft_net);
10136 /* step 3. Start new generation, rules_gen_X now in use. */
10137 net->nft.gencursor = nft_gencursor_next(net);
10139 list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
10140 nf_tables_commit_audit_collect(&adl, trans->ctx.table,
10142 switch (trans->msg_type) {
10143 case NFT_MSG_NEWTABLE:
10144 if (nft_trans_table_update(trans)) {
10145 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
10146 nft_trans_destroy(trans);
10149 if (trans->ctx.table->flags & NFT_TABLE_F_DORMANT)
10150 nf_tables_table_disable(net, trans->ctx.table);
10152 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
10154 nft_clear(net, trans->ctx.table);
10156 nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
10157 nft_trans_destroy(trans);
10159 case NFT_MSG_DELTABLE:
10160 case NFT_MSG_DESTROYTABLE:
10161 list_del_rcu(&trans->ctx.table->list);
10162 nf_tables_table_notify(&trans->ctx, trans->msg_type);
10164 case NFT_MSG_NEWCHAIN:
10165 if (nft_trans_chain_update(trans)) {
10166 nft_chain_commit_update(trans);
10167 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN,
10168 &nft_trans_chain_hooks(trans));
10169 list_splice(&nft_trans_chain_hooks(trans),
10170 &nft_trans_basechain(trans)->hook_list);
10171 /* trans destroyed after rcu grace period */
10173 nft_chain_commit_drop_policy(trans);
10174 nft_clear(net, trans->ctx.chain);
10175 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN, NULL);
10176 nft_trans_destroy(trans);
10179 case NFT_MSG_DELCHAIN:
10180 case NFT_MSG_DESTROYCHAIN:
10181 if (nft_trans_chain_update(trans)) {
10182 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN,
10183 &nft_trans_chain_hooks(trans));
10184 nft_netdev_unregister_hooks(net,
10185 &nft_trans_chain_hooks(trans),
10188 nft_chain_del(trans->ctx.chain);
10189 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN,
10191 nf_tables_unregister_hook(trans->ctx.net,
10196 case NFT_MSG_NEWRULE:
10197 nft_clear(trans->ctx.net, nft_trans_rule(trans));
10198 nf_tables_rule_notify(&trans->ctx,
10199 nft_trans_rule(trans),
10201 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
10202 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
10204 nft_trans_destroy(trans);
10206 case NFT_MSG_DELRULE:
10207 case NFT_MSG_DESTROYRULE:
10208 list_del_rcu(&nft_trans_rule(trans)->list);
10209 nf_tables_rule_notify(&trans->ctx,
10210 nft_trans_rule(trans),
10212 nft_rule_expr_deactivate(&trans->ctx,
10213 nft_trans_rule(trans),
10216 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
10217 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
10219 case NFT_MSG_NEWSET:
10220 if (nft_trans_set_update(trans)) {
10221 struct nft_set *set = nft_trans_set(trans);
10223 WRITE_ONCE(set->timeout, nft_trans_set_timeout(trans));
10224 WRITE_ONCE(set->gc_int, nft_trans_set_gc_int(trans));
10226 if (nft_trans_set_size(trans))
10227 WRITE_ONCE(set->size, nft_trans_set_size(trans));
10229 nft_clear(net, nft_trans_set(trans));
10230 /* This avoids hitting -EBUSY when deleting the table
10231 * from the transaction.
10233 if (nft_set_is_anonymous(nft_trans_set(trans)) &&
10234 !list_empty(&nft_trans_set(trans)->bindings))
10235 nft_use_dec(&trans->ctx.table->use);
10237 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
10238 NFT_MSG_NEWSET, GFP_KERNEL);
10239 nft_trans_destroy(trans);
10241 case NFT_MSG_DELSET:
10242 case NFT_MSG_DESTROYSET:
10243 nft_trans_set(trans)->dead = 1;
10244 list_del_rcu(&nft_trans_set(trans)->list);
10245 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
10246 trans->msg_type, GFP_KERNEL);
10248 case NFT_MSG_NEWSETELEM:
10249 te = (struct nft_trans_elem *)trans->data;
10251 nft_setelem_activate(net, te->set, te->elem_priv);
10252 nf_tables_setelem_notify(&trans->ctx, te->set,
10254 NFT_MSG_NEWSETELEM);
10255 if (te->set->ops->commit &&
10256 list_empty(&te->set->pending_update)) {
10257 list_add_tail(&te->set->pending_update,
10260 nft_trans_destroy(trans);
10262 case NFT_MSG_DELSETELEM:
10263 case NFT_MSG_DESTROYSETELEM:
10264 te = (struct nft_trans_elem *)trans->data;
10266 nf_tables_setelem_notify(&trans->ctx, te->set,
10269 nft_setelem_remove(net, te->set, te->elem_priv);
10270 if (!nft_setelem_is_catchall(te->set, te->elem_priv)) {
10271 atomic_dec(&te->set->nelems);
10274 if (te->set->ops->commit &&
10275 list_empty(&te->set->pending_update)) {
10276 list_add_tail(&te->set->pending_update,
10280 case NFT_MSG_NEWOBJ:
10281 if (nft_trans_obj_update(trans)) {
10282 nft_obj_commit_update(trans);
10283 nf_tables_obj_notify(&trans->ctx,
10284 nft_trans_obj(trans),
10287 nft_clear(net, nft_trans_obj(trans));
10288 nf_tables_obj_notify(&trans->ctx,
10289 nft_trans_obj(trans),
10291 nft_trans_destroy(trans);
10294 case NFT_MSG_DELOBJ:
10295 case NFT_MSG_DESTROYOBJ:
10296 nft_obj_del(nft_trans_obj(trans));
10297 nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
10300 case NFT_MSG_NEWFLOWTABLE:
10301 if (nft_trans_flowtable_update(trans)) {
10302 nft_trans_flowtable(trans)->data.flags =
10303 nft_trans_flowtable_flags(trans);
10304 nf_tables_flowtable_notify(&trans->ctx,
10305 nft_trans_flowtable(trans),
10306 &nft_trans_flowtable_hooks(trans),
10307 NFT_MSG_NEWFLOWTABLE);
10308 list_splice(&nft_trans_flowtable_hooks(trans),
10309 &nft_trans_flowtable(trans)->hook_list);
10311 nft_clear(net, nft_trans_flowtable(trans));
10312 nf_tables_flowtable_notify(&trans->ctx,
10313 nft_trans_flowtable(trans),
10315 NFT_MSG_NEWFLOWTABLE);
10317 nft_trans_destroy(trans);
10319 case NFT_MSG_DELFLOWTABLE:
10320 case NFT_MSG_DESTROYFLOWTABLE:
10321 if (nft_trans_flowtable_update(trans)) {
10322 nf_tables_flowtable_notify(&trans->ctx,
10323 nft_trans_flowtable(trans),
10324 &nft_trans_flowtable_hooks(trans),
10326 nft_unregister_flowtable_net_hooks(net,
10327 &nft_trans_flowtable_hooks(trans));
10329 list_del_rcu(&nft_trans_flowtable(trans)->list);
10330 nf_tables_flowtable_notify(&trans->ctx,
10331 nft_trans_flowtable(trans),
10334 nft_unregister_flowtable_net_hooks(net,
10335 &nft_trans_flowtable(trans)->hook_list);
10341 nft_set_commit_update(&set_update_list);
10343 nft_commit_notify(net, NETLINK_CB(skb).portid);
10344 nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
10345 nf_tables_commit_audit_log(&adl, nft_net->base_seq);
10347 nft_gc_seq_end(nft_net, gc_seq);
10348 nft_net->validate_state = NFT_VALIDATE_SKIP;
10349 nf_tables_commit_release(net);
10354 static void nf_tables_module_autoload(struct net *net)
10356 struct nftables_pernet *nft_net = nft_pernet(net);
10357 struct nft_module_request *req, *next;
10358 LIST_HEAD(module_list);
10360 list_splice_init(&nft_net->module_list, &module_list);
10361 mutex_unlock(&nft_net->commit_mutex);
10362 list_for_each_entry_safe(req, next, &module_list, list) {
10363 request_module("%s", req->module);
10366 mutex_lock(&nft_net->commit_mutex);
10367 list_splice(&module_list, &nft_net->module_list);
10370 static void nf_tables_abort_release(struct nft_trans *trans)
10372 switch (trans->msg_type) {
10373 case NFT_MSG_NEWTABLE:
10374 nf_tables_table_destroy(&trans->ctx);
10376 case NFT_MSG_NEWCHAIN:
10377 if (nft_trans_chain_update(trans))
10378 nft_hooks_destroy(&nft_trans_chain_hooks(trans));
10380 nf_tables_chain_destroy(&trans->ctx);
10382 case NFT_MSG_NEWRULE:
10383 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
10385 case NFT_MSG_NEWSET:
10386 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
10388 case NFT_MSG_NEWSETELEM:
10389 nft_set_elem_destroy(nft_trans_elem_set(trans),
10390 nft_trans_elem_priv(trans), true);
10392 case NFT_MSG_NEWOBJ:
10393 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
10395 case NFT_MSG_NEWFLOWTABLE:
10396 if (nft_trans_flowtable_update(trans))
10397 nft_hooks_destroy(&nft_trans_flowtable_hooks(trans));
10399 nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
10405 static void nft_set_abort_update(struct list_head *set_update_list)
10407 struct nft_set *set, *next;
10409 list_for_each_entry_safe(set, next, set_update_list, pending_update) {
10410 list_del_init(&set->pending_update);
10412 if (!set->ops->abort)
10415 set->ops->abort(set);
10419 static int __nf_tables_abort(struct net *net, enum nfnl_abort_action action)
10421 struct nftables_pernet *nft_net = nft_pernet(net);
10422 struct nft_trans *trans, *next;
10423 LIST_HEAD(set_update_list);
10424 struct nft_trans_elem *te;
10426 if (action == NFNL_ABORT_VALIDATE &&
10427 nf_tables_validate(net) < 0)
10430 list_for_each_entry_safe_reverse(trans, next, &nft_net->commit_list,
10432 switch (trans->msg_type) {
10433 case NFT_MSG_NEWTABLE:
10434 if (nft_trans_table_update(trans)) {
10435 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
10436 nft_trans_destroy(trans);
10439 if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_DORMANT) {
10440 nf_tables_table_disable(net, trans->ctx.table);
10441 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
10442 } else if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_AWAKEN) {
10443 trans->ctx.table->flags &= ~NFT_TABLE_F_DORMANT;
10445 if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_ORPHAN) {
10446 trans->ctx.table->flags &= ~NFT_TABLE_F_OWNER;
10447 trans->ctx.table->nlpid = 0;
10449 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
10450 nft_trans_destroy(trans);
10452 list_del_rcu(&trans->ctx.table->list);
10455 case NFT_MSG_DELTABLE:
10456 case NFT_MSG_DESTROYTABLE:
10457 nft_clear(trans->ctx.net, trans->ctx.table);
10458 nft_trans_destroy(trans);
10460 case NFT_MSG_NEWCHAIN:
10461 if (nft_trans_chain_update(trans)) {
10462 nft_netdev_unregister_hooks(net,
10463 &nft_trans_chain_hooks(trans),
10465 free_percpu(nft_trans_chain_stats(trans));
10466 kfree(nft_trans_chain_name(trans));
10467 nft_trans_destroy(trans);
10469 if (nft_trans_chain_bound(trans)) {
10470 nft_trans_destroy(trans);
10473 nft_use_dec_restore(&trans->ctx.table->use);
10474 nft_chain_del(trans->ctx.chain);
10475 nf_tables_unregister_hook(trans->ctx.net,
10480 case NFT_MSG_DELCHAIN:
10481 case NFT_MSG_DESTROYCHAIN:
10482 if (nft_trans_chain_update(trans)) {
10483 list_splice(&nft_trans_chain_hooks(trans),
10484 &nft_trans_basechain(trans)->hook_list);
10486 nft_use_inc_restore(&trans->ctx.table->use);
10487 nft_clear(trans->ctx.net, trans->ctx.chain);
10489 nft_trans_destroy(trans);
10491 case NFT_MSG_NEWRULE:
10492 if (nft_trans_rule_bound(trans)) {
10493 nft_trans_destroy(trans);
10496 nft_use_dec_restore(&trans->ctx.chain->use);
10497 list_del_rcu(&nft_trans_rule(trans)->list);
10498 nft_rule_expr_deactivate(&trans->ctx,
10499 nft_trans_rule(trans),
10501 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
10502 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
10504 case NFT_MSG_DELRULE:
10505 case NFT_MSG_DESTROYRULE:
10506 nft_use_inc_restore(&trans->ctx.chain->use);
10507 nft_clear(trans->ctx.net, nft_trans_rule(trans));
10508 nft_rule_expr_activate(&trans->ctx, nft_trans_rule(trans));
10509 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
10510 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
10512 nft_trans_destroy(trans);
10514 case NFT_MSG_NEWSET:
10515 if (nft_trans_set_update(trans)) {
10516 nft_trans_destroy(trans);
10519 nft_use_dec_restore(&trans->ctx.table->use);
10520 if (nft_trans_set_bound(trans)) {
10521 nft_trans_destroy(trans);
10524 nft_trans_set(trans)->dead = 1;
10525 list_del_rcu(&nft_trans_set(trans)->list);
10527 case NFT_MSG_DELSET:
10528 case NFT_MSG_DESTROYSET:
10529 nft_use_inc_restore(&trans->ctx.table->use);
10530 nft_clear(trans->ctx.net, nft_trans_set(trans));
10531 if (nft_trans_set(trans)->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
10532 nft_map_activate(&trans->ctx, nft_trans_set(trans));
10534 nft_trans_destroy(trans);
10536 case NFT_MSG_NEWSETELEM:
10537 if (nft_trans_elem_set_bound(trans)) {
10538 nft_trans_destroy(trans);
10541 te = (struct nft_trans_elem *)trans->data;
10542 nft_setelem_remove(net, te->set, te->elem_priv);
10543 if (!nft_setelem_is_catchall(te->set, te->elem_priv))
10544 atomic_dec(&te->set->nelems);
10546 if (te->set->ops->abort &&
10547 list_empty(&te->set->pending_update)) {
10548 list_add_tail(&te->set->pending_update,
10552 case NFT_MSG_DELSETELEM:
10553 case NFT_MSG_DESTROYSETELEM:
10554 te = (struct nft_trans_elem *)trans->data;
10556 nft_setelem_data_activate(net, te->set, te->elem_priv);
10557 nft_setelem_activate(net, te->set, te->elem_priv);
10558 if (!nft_setelem_is_catchall(te->set, te->elem_priv))
10561 if (te->set->ops->abort &&
10562 list_empty(&te->set->pending_update)) {
10563 list_add_tail(&te->set->pending_update,
10566 nft_trans_destroy(trans);
10568 case NFT_MSG_NEWOBJ:
10569 if (nft_trans_obj_update(trans)) {
10570 nft_obj_destroy(&trans->ctx, nft_trans_obj_newobj(trans));
10571 nft_trans_destroy(trans);
10573 nft_use_dec_restore(&trans->ctx.table->use);
10574 nft_obj_del(nft_trans_obj(trans));
10577 case NFT_MSG_DELOBJ:
10578 case NFT_MSG_DESTROYOBJ:
10579 nft_use_inc_restore(&trans->ctx.table->use);
10580 nft_clear(trans->ctx.net, nft_trans_obj(trans));
10581 nft_trans_destroy(trans);
10583 case NFT_MSG_NEWFLOWTABLE:
10584 if (nft_trans_flowtable_update(trans)) {
10585 nft_unregister_flowtable_net_hooks(net,
10586 &nft_trans_flowtable_hooks(trans));
10588 nft_use_dec_restore(&trans->ctx.table->use);
10589 list_del_rcu(&nft_trans_flowtable(trans)->list);
10590 nft_unregister_flowtable_net_hooks(net,
10591 &nft_trans_flowtable(trans)->hook_list);
10594 case NFT_MSG_DELFLOWTABLE:
10595 case NFT_MSG_DESTROYFLOWTABLE:
10596 if (nft_trans_flowtable_update(trans)) {
10597 list_splice(&nft_trans_flowtable_hooks(trans),
10598 &nft_trans_flowtable(trans)->hook_list);
10600 nft_use_inc_restore(&trans->ctx.table->use);
10601 nft_clear(trans->ctx.net, nft_trans_flowtable(trans));
10603 nft_trans_destroy(trans);
10608 nft_set_abort_update(&set_update_list);
10612 list_for_each_entry_safe_reverse(trans, next,
10613 &nft_net->commit_list, list) {
10614 nft_trans_list_del(trans);
10615 nf_tables_abort_release(trans);
10618 if (action == NFNL_ABORT_AUTOLOAD)
10619 nf_tables_module_autoload(net);
10621 nf_tables_module_autoload_cleanup(net);
10626 static int nf_tables_abort(struct net *net, struct sk_buff *skb,
10627 enum nfnl_abort_action action)
10629 struct nftables_pernet *nft_net = nft_pernet(net);
10630 unsigned int gc_seq;
10633 gc_seq = nft_gc_seq_begin(nft_net);
10634 ret = __nf_tables_abort(net, action);
10635 nft_gc_seq_end(nft_net, gc_seq);
10636 mutex_unlock(&nft_net->commit_mutex);
10641 static bool nf_tables_valid_genid(struct net *net, u32 genid)
10643 struct nftables_pernet *nft_net = nft_pernet(net);
10646 mutex_lock(&nft_net->commit_mutex);
10647 nft_net->tstamp = get_jiffies_64();
10649 genid_ok = genid == 0 || nft_net->base_seq == genid;
10651 mutex_unlock(&nft_net->commit_mutex);
10653 /* else, commit mutex has to be released by commit or abort function */
10657 static const struct nfnetlink_subsystem nf_tables_subsys = {
10658 .name = "nf_tables",
10659 .subsys_id = NFNL_SUBSYS_NFTABLES,
10660 .cb_count = NFT_MSG_MAX,
10661 .cb = nf_tables_cb,
10662 .commit = nf_tables_commit,
10663 .abort = nf_tables_abort,
10664 .valid_genid = nf_tables_valid_genid,
10665 .owner = THIS_MODULE,
10668 int nft_chain_validate_dependency(const struct nft_chain *chain,
10669 enum nft_chain_types type)
10671 const struct nft_base_chain *basechain;
10673 if (nft_is_base_chain(chain)) {
10674 basechain = nft_base_chain(chain);
10675 if (basechain->type->type != type)
10676 return -EOPNOTSUPP;
10680 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
10682 int nft_chain_validate_hooks(const struct nft_chain *chain,
10683 unsigned int hook_flags)
10685 struct nft_base_chain *basechain;
10687 if (nft_is_base_chain(chain)) {
10688 basechain = nft_base_chain(chain);
10690 if ((1 << basechain->ops.hooknum) & hook_flags)
10693 return -EOPNOTSUPP;
10698 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
10701 * Loop detection - walk through the ruleset beginning at the destination chain
10702 * of a new jump until either the source chain is reached (loop) or all
10703 * reachable chains have been traversed.
10705 * The loop check is performed whenever a new jump verdict is added to an
10706 * expression or verdict map or a verdict map is bound to a new chain.
10709 static int nf_tables_check_loops(const struct nft_ctx *ctx,
10710 const struct nft_chain *chain);
10712 static int nft_check_loops(const struct nft_ctx *ctx,
10713 const struct nft_set_ext *ext)
10715 const struct nft_data *data;
10718 data = nft_set_ext_data(ext);
10719 switch (data->verdict.code) {
10722 ret = nf_tables_check_loops(ctx, data->verdict.chain);
10732 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
10733 struct nft_set *set,
10734 const struct nft_set_iter *iter,
10735 struct nft_elem_priv *elem_priv)
10737 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem_priv);
10739 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
10740 *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
10743 return nft_check_loops(ctx, ext);
10746 static int nft_set_catchall_loops(const struct nft_ctx *ctx,
10747 struct nft_set *set)
10749 u8 genmask = nft_genmask_next(ctx->net);
10750 struct nft_set_elem_catchall *catchall;
10751 struct nft_set_ext *ext;
10754 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
10755 ext = nft_set_elem_ext(set, catchall->elem);
10756 if (!nft_set_elem_active(ext, genmask))
10759 ret = nft_check_loops(ctx, ext);
10767 static int nf_tables_check_loops(const struct nft_ctx *ctx,
10768 const struct nft_chain *chain)
10770 const struct nft_rule *rule;
10771 const struct nft_expr *expr, *last;
10772 struct nft_set *set;
10773 struct nft_set_binding *binding;
10774 struct nft_set_iter iter;
10776 if (ctx->chain == chain)
10779 if (fatal_signal_pending(current))
10782 list_for_each_entry(rule, &chain->rules, list) {
10783 nft_rule_for_each_expr(expr, last, rule) {
10784 struct nft_immediate_expr *priv;
10785 const struct nft_data *data;
10788 if (strcmp(expr->ops->type->name, "immediate"))
10791 priv = nft_expr_priv(expr);
10792 if (priv->dreg != NFT_REG_VERDICT)
10795 data = &priv->data;
10796 switch (data->verdict.code) {
10799 err = nf_tables_check_loops(ctx,
10800 data->verdict.chain);
10810 list_for_each_entry(set, &ctx->table->sets, list) {
10811 if (!nft_is_active_next(ctx->net, set))
10813 if (!(set->flags & NFT_SET_MAP) ||
10814 set->dtype != NFT_DATA_VERDICT)
10817 list_for_each_entry(binding, &set->bindings, list) {
10818 if (!(binding->flags & NFT_SET_MAP) ||
10819 binding->chain != chain)
10822 iter.genmask = nft_genmask_next(ctx->net);
10826 iter.fn = nf_tables_loop_check_setelem;
10828 set->ops->walk(ctx, set, &iter);
10830 iter.err = nft_set_catchall_loops(ctx, set);
10841 * nft_parse_u32_check - fetch u32 attribute and check for maximum value
10843 * @attr: netlink attribute to fetch value from
10844 * @max: maximum value to be stored in dest
10845 * @dest: pointer to the variable
10847 * Parse, check and store a given u32 netlink attribute into variable.
10848 * This function returns -ERANGE if the value goes over maximum value.
10849 * Otherwise a 0 is returned and the attribute value is stored in the
10850 * destination variable.
10852 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
10856 val = ntohl(nla_get_be32(attr));
10863 EXPORT_SYMBOL_GPL(nft_parse_u32_check);
10865 static int nft_parse_register(const struct nlattr *attr, u32 *preg)
10869 reg = ntohl(nla_get_be32(attr));
10871 case NFT_REG_VERDICT...NFT_REG_4:
10872 *preg = reg * NFT_REG_SIZE / NFT_REG32_SIZE;
10874 case NFT_REG32_00...NFT_REG32_15:
10875 *preg = reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
10885 * nft_dump_register - dump a register value to a netlink attribute
10887 * @skb: socket buffer
10888 * @attr: attribute number
10889 * @reg: register number
10891 * Construct a netlink attribute containing the register number. For
10892 * compatibility reasons, register numbers being a multiple of 4 are
10893 * translated to the corresponding 128 bit register numbers.
10895 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
10897 if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
10898 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
10900 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
10902 return nla_put_be32(skb, attr, htonl(reg));
10904 EXPORT_SYMBOL_GPL(nft_dump_register);
10906 static int nft_validate_register_load(enum nft_registers reg, unsigned int len)
10908 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
10912 if (reg * NFT_REG32_SIZE + len > sizeof_field(struct nft_regs, data))
10918 int nft_parse_register_load(const struct nlattr *attr, u8 *sreg, u32 len)
10923 err = nft_parse_register(attr, ®);
10927 err = nft_validate_register_load(reg, len);
10934 EXPORT_SYMBOL_GPL(nft_parse_register_load);
10936 static int nft_validate_register_store(const struct nft_ctx *ctx,
10937 enum nft_registers reg,
10938 const struct nft_data *data,
10939 enum nft_data_types type,
10945 case NFT_REG_VERDICT:
10946 if (type != NFT_DATA_VERDICT)
10949 if (data != NULL &&
10950 (data->verdict.code == NFT_GOTO ||
10951 data->verdict.code == NFT_JUMP)) {
10952 err = nf_tables_check_loops(ctx, data->verdict.chain);
10959 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
10963 if (reg * NFT_REG32_SIZE + len >
10964 sizeof_field(struct nft_regs, data))
10967 if (data != NULL && type != NFT_DATA_VALUE)
10973 int nft_parse_register_store(const struct nft_ctx *ctx,
10974 const struct nlattr *attr, u8 *dreg,
10975 const struct nft_data *data,
10976 enum nft_data_types type, unsigned int len)
10981 err = nft_parse_register(attr, ®);
10985 err = nft_validate_register_store(ctx, reg, data, type, len);
10992 EXPORT_SYMBOL_GPL(nft_parse_register_store);
10994 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
10995 [NFTA_VERDICT_CODE] = { .type = NLA_U32 },
10996 [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING,
10997 .len = NFT_CHAIN_MAXNAMELEN - 1 },
10998 [NFTA_VERDICT_CHAIN_ID] = { .type = NLA_U32 },
11001 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
11002 struct nft_data_desc *desc, const struct nlattr *nla)
11004 u8 genmask = nft_genmask_next(ctx->net);
11005 struct nlattr *tb[NFTA_VERDICT_MAX + 1];
11006 struct nft_chain *chain;
11009 err = nla_parse_nested_deprecated(tb, NFTA_VERDICT_MAX, nla,
11010 nft_verdict_policy, NULL);
11014 if (!tb[NFTA_VERDICT_CODE])
11017 /* zero padding hole for memcmp */
11018 memset(data, 0, sizeof(*data));
11019 data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
11021 switch (data->verdict.code) {
11032 if (tb[NFTA_VERDICT_CHAIN]) {
11033 chain = nft_chain_lookup(ctx->net, ctx->table,
11034 tb[NFTA_VERDICT_CHAIN],
11036 } else if (tb[NFTA_VERDICT_CHAIN_ID]) {
11037 chain = nft_chain_lookup_byid(ctx->net, ctx->table,
11038 tb[NFTA_VERDICT_CHAIN_ID],
11041 return PTR_ERR(chain);
11047 return PTR_ERR(chain);
11048 if (nft_is_base_chain(chain))
11049 return -EOPNOTSUPP;
11050 if (nft_chain_is_bound(chain))
11052 if (desc->flags & NFT_DATA_DESC_SETELEM &&
11053 chain->flags & NFT_CHAIN_BINDING)
11055 if (!nft_use_inc(&chain->use))
11058 data->verdict.chain = chain;
11064 desc->len = sizeof(data->verdict);
11069 static void nft_verdict_uninit(const struct nft_data *data)
11071 struct nft_chain *chain;
11073 switch (data->verdict.code) {
11076 chain = data->verdict.chain;
11077 nft_use_dec(&chain->use);
11082 int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
11084 struct nlattr *nest;
11086 nest = nla_nest_start_noflag(skb, type);
11088 goto nla_put_failure;
11090 if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
11091 goto nla_put_failure;
11096 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
11098 goto nla_put_failure;
11100 nla_nest_end(skb, nest);
11107 static int nft_value_init(const struct nft_ctx *ctx,
11108 struct nft_data *data, struct nft_data_desc *desc,
11109 const struct nlattr *nla)
11113 len = nla_len(nla);
11116 if (len > desc->size)
11119 if (len != desc->len)
11125 nla_memcpy(data->data, nla, len);
11130 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
11133 return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
11136 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
11137 [NFTA_DATA_VALUE] = { .type = NLA_BINARY },
11138 [NFTA_DATA_VERDICT] = { .type = NLA_NESTED },
11142 * nft_data_init - parse nf_tables data netlink attributes
11144 * @ctx: context of the expression using the data
11145 * @data: destination struct nft_data
11146 * @desc: data description
11147 * @nla: netlink attribute containing data
11149 * Parse the netlink data attributes and initialize a struct nft_data.
11150 * The type and length of data are returned in the data description.
11152 * The caller can indicate that it only wants to accept data of type
11153 * NFT_DATA_VALUE by passing NULL for the ctx argument.
11155 int nft_data_init(const struct nft_ctx *ctx, struct nft_data *data,
11156 struct nft_data_desc *desc, const struct nlattr *nla)
11158 struct nlattr *tb[NFTA_DATA_MAX + 1];
11161 if (WARN_ON_ONCE(!desc->size))
11164 err = nla_parse_nested_deprecated(tb, NFTA_DATA_MAX, nla,
11165 nft_data_policy, NULL);
11169 if (tb[NFTA_DATA_VALUE]) {
11170 if (desc->type != NFT_DATA_VALUE)
11173 err = nft_value_init(ctx, data, desc, tb[NFTA_DATA_VALUE]);
11174 } else if (tb[NFTA_DATA_VERDICT] && ctx != NULL) {
11175 if (desc->type != NFT_DATA_VERDICT)
11178 err = nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
11185 EXPORT_SYMBOL_GPL(nft_data_init);
11188 * nft_data_release - release a nft_data item
11190 * @data: struct nft_data to release
11191 * @type: type of data
11193 * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
11194 * all others need to be released by calling this function.
11196 void nft_data_release(const struct nft_data *data, enum nft_data_types type)
11198 if (type < NFT_DATA_VERDICT)
11201 case NFT_DATA_VERDICT:
11202 return nft_verdict_uninit(data);
11207 EXPORT_SYMBOL_GPL(nft_data_release);
11209 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
11210 enum nft_data_types type, unsigned int len)
11212 struct nlattr *nest;
11215 nest = nla_nest_start_noflag(skb, attr);
11220 case NFT_DATA_VALUE:
11221 err = nft_value_dump(skb, data, len);
11223 case NFT_DATA_VERDICT:
11224 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
11231 nla_nest_end(skb, nest);
11234 EXPORT_SYMBOL_GPL(nft_data_dump);
11236 int __nft_release_basechain(struct nft_ctx *ctx)
11238 struct nft_rule *rule, *nr;
11240 if (WARN_ON(!nft_is_base_chain(ctx->chain)))
11243 nf_tables_unregister_hook(ctx->net, ctx->chain->table, ctx->chain);
11244 list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
11245 list_del(&rule->list);
11246 nft_use_dec(&ctx->chain->use);
11247 nf_tables_rule_release(ctx, rule);
11249 nft_chain_del(ctx->chain);
11250 nft_use_dec(&ctx->table->use);
11251 nf_tables_chain_destroy(ctx);
11255 EXPORT_SYMBOL_GPL(__nft_release_basechain);
11257 static void __nft_release_hook(struct net *net, struct nft_table *table)
11259 struct nft_flowtable *flowtable;
11260 struct nft_chain *chain;
11262 list_for_each_entry(chain, &table->chains, list)
11263 __nf_tables_unregister_hook(net, table, chain, true);
11264 list_for_each_entry(flowtable, &table->flowtables, list)
11265 __nft_unregister_flowtable_net_hooks(net, &flowtable->hook_list,
11269 static void __nft_release_hooks(struct net *net)
11271 struct nftables_pernet *nft_net = nft_pernet(net);
11272 struct nft_table *table;
11274 list_for_each_entry(table, &nft_net->tables, list) {
11275 if (nft_table_has_owner(table))
11278 __nft_release_hook(net, table);
11282 static void __nft_release_table(struct net *net, struct nft_table *table)
11284 struct nft_flowtable *flowtable, *nf;
11285 struct nft_chain *chain, *nc;
11286 struct nft_object *obj, *ne;
11287 struct nft_rule *rule, *nr;
11288 struct nft_set *set, *ns;
11289 struct nft_ctx ctx = {
11291 .family = NFPROTO_NETDEV,
11294 ctx.family = table->family;
11296 list_for_each_entry(chain, &table->chains, list) {
11297 if (nft_chain_binding(chain))
11301 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
11302 list_del(&rule->list);
11303 nft_use_dec(&chain->use);
11304 nf_tables_rule_release(&ctx, rule);
11307 list_for_each_entry_safe(flowtable, nf, &table->flowtables, list) {
11308 list_del(&flowtable->list);
11309 nft_use_dec(&table->use);
11310 nf_tables_flowtable_destroy(flowtable);
11312 list_for_each_entry_safe(set, ns, &table->sets, list) {
11313 list_del(&set->list);
11314 nft_use_dec(&table->use);
11315 if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
11316 nft_map_deactivate(&ctx, set);
11318 nft_set_destroy(&ctx, set);
11320 list_for_each_entry_safe(obj, ne, &table->objects, list) {
11322 nft_use_dec(&table->use);
11323 nft_obj_destroy(&ctx, obj);
11325 list_for_each_entry_safe(chain, nc, &table->chains, list) {
11327 nft_chain_del(chain);
11328 nft_use_dec(&table->use);
11329 nf_tables_chain_destroy(&ctx);
11331 nf_tables_table_destroy(&ctx);
11334 static void __nft_release_tables(struct net *net)
11336 struct nftables_pernet *nft_net = nft_pernet(net);
11337 struct nft_table *table, *nt;
11339 list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
11340 if (nft_table_has_owner(table))
11343 list_del(&table->list);
11345 __nft_release_table(net, table);
11349 static int nft_rcv_nl_event(struct notifier_block *this, unsigned long event,
11352 struct nft_table *table, *to_delete[8];
11353 struct nftables_pernet *nft_net;
11354 struct netlink_notify *n = ptr;
11355 struct net *net = n->net;
11356 unsigned int deleted;
11357 bool restart = false;
11358 unsigned int gc_seq;
11360 if (event != NETLINK_URELEASE || n->protocol != NETLINK_NETFILTER)
11361 return NOTIFY_DONE;
11363 nft_net = nft_pernet(net);
11365 mutex_lock(&nft_net->commit_mutex);
11367 gc_seq = nft_gc_seq_begin(nft_net);
11369 if (!list_empty(&nf_tables_destroy_list))
11370 nf_tables_trans_destroy_flush_work();
11372 list_for_each_entry(table, &nft_net->tables, list) {
11373 if (nft_table_has_owner(table) &&
11374 n->portid == table->nlpid) {
11375 if (table->flags & NFT_TABLE_F_PERSIST) {
11376 table->flags &= ~NFT_TABLE_F_OWNER;
11379 __nft_release_hook(net, table);
11380 list_del_rcu(&table->list);
11381 to_delete[deleted++] = table;
11382 if (deleted >= ARRAY_SIZE(to_delete))
11387 restart = deleted >= ARRAY_SIZE(to_delete);
11390 __nft_release_table(net, to_delete[--deleted]);
11395 nft_gc_seq_end(nft_net, gc_seq);
11397 mutex_unlock(&nft_net->commit_mutex);
11399 return NOTIFY_DONE;
11402 static struct notifier_block nft_nl_notifier = {
11403 .notifier_call = nft_rcv_nl_event,
11406 static int __net_init nf_tables_init_net(struct net *net)
11408 struct nftables_pernet *nft_net = nft_pernet(net);
11410 INIT_LIST_HEAD(&nft_net->tables);
11411 INIT_LIST_HEAD(&nft_net->commit_list);
11412 INIT_LIST_HEAD(&nft_net->binding_list);
11413 INIT_LIST_HEAD(&nft_net->module_list);
11414 INIT_LIST_HEAD(&nft_net->notify_list);
11415 mutex_init(&nft_net->commit_mutex);
11416 nft_net->base_seq = 1;
11417 nft_net->gc_seq = 0;
11418 nft_net->validate_state = NFT_VALIDATE_SKIP;
11423 static void __net_exit nf_tables_pre_exit_net(struct net *net)
11425 struct nftables_pernet *nft_net = nft_pernet(net);
11427 mutex_lock(&nft_net->commit_mutex);
11428 __nft_release_hooks(net);
11429 mutex_unlock(&nft_net->commit_mutex);
11432 static void __net_exit nf_tables_exit_net(struct net *net)
11434 struct nftables_pernet *nft_net = nft_pernet(net);
11435 unsigned int gc_seq;
11437 mutex_lock(&nft_net->commit_mutex);
11439 gc_seq = nft_gc_seq_begin(nft_net);
11441 if (!list_empty(&nft_net->commit_list) ||
11442 !list_empty(&nft_net->module_list))
11443 __nf_tables_abort(net, NFNL_ABORT_NONE);
11445 __nft_release_tables(net);
11447 nft_gc_seq_end(nft_net, gc_seq);
11449 mutex_unlock(&nft_net->commit_mutex);
11450 WARN_ON_ONCE(!list_empty(&nft_net->tables));
11451 WARN_ON_ONCE(!list_empty(&nft_net->module_list));
11452 WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
11455 static void nf_tables_exit_batch(struct list_head *net_exit_list)
11457 flush_work(&trans_gc_work);
11460 static struct pernet_operations nf_tables_net_ops = {
11461 .init = nf_tables_init_net,
11462 .pre_exit = nf_tables_pre_exit_net,
11463 .exit = nf_tables_exit_net,
11464 .exit_batch = nf_tables_exit_batch,
11465 .id = &nf_tables_net_id,
11466 .size = sizeof(struct nftables_pernet),
11469 static int __init nf_tables_module_init(void)
11473 err = register_pernet_subsys(&nf_tables_net_ops);
11477 err = nft_chain_filter_init();
11479 goto err_chain_filter;
11481 err = nf_tables_core_module_init();
11483 goto err_core_module;
11485 err = register_netdevice_notifier(&nf_tables_flowtable_notifier);
11487 goto err_netdev_notifier;
11489 err = rhltable_init(&nft_objname_ht, &nft_objname_ht_params);
11491 goto err_rht_objname;
11493 err = nft_offload_init();
11497 err = netlink_register_notifier(&nft_nl_notifier);
11499 goto err_netlink_notifier;
11502 err = nfnetlink_subsys_register(&nf_tables_subsys);
11504 goto err_nfnl_subsys;
11506 nft_chain_route_init();
11511 netlink_unregister_notifier(&nft_nl_notifier);
11512 err_netlink_notifier:
11513 nft_offload_exit();
11515 rhltable_destroy(&nft_objname_ht);
11517 unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
11518 err_netdev_notifier:
11519 nf_tables_core_module_exit();
11521 nft_chain_filter_fini();
11523 unregister_pernet_subsys(&nf_tables_net_ops);
11527 static void __exit nf_tables_module_exit(void)
11529 nfnetlink_subsys_unregister(&nf_tables_subsys);
11530 netlink_unregister_notifier(&nft_nl_notifier);
11531 nft_offload_exit();
11532 unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
11533 nft_chain_filter_fini();
11534 nft_chain_route_fini();
11535 unregister_pernet_subsys(&nf_tables_net_ops);
11536 cancel_work_sync(&trans_gc_work);
11537 cancel_work_sync(&trans_destroy_work);
11539 rhltable_destroy(&nft_objname_ht);
11540 nf_tables_core_module_exit();
11543 module_init(nf_tables_module_init);
11544 module_exit(nf_tables_module_exit);
11546 MODULE_LICENSE("GPL");
11547 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
11548 MODULE_DESCRIPTION("Framework for packet filtering and classification");
11549 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);