1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (c) 2007-2009 Patrick McHardy <kaber@trash.net>
5 * Development of this code funded by Astaro AG (http://www.astaro.com/)
8 #include <linux/module.h>
9 #include <linux/init.h>
10 #include <linux/list.h>
11 #include <linux/skbuff.h>
12 #include <linux/netlink.h>
13 #include <linux/vmalloc.h>
14 #include <linux/rhashtable.h>
15 #include <linux/audit.h>
16 #include <linux/netfilter.h>
17 #include <linux/netfilter/nfnetlink.h>
18 #include <linux/netfilter/nf_tables.h>
19 #include <net/netfilter/nf_flow_table.h>
20 #include <net/netfilter/nf_tables_core.h>
21 #include <net/netfilter/nf_tables.h>
22 #include <net/netfilter/nf_tables_offload.h>
23 #include <net/net_namespace.h>
26 #define NFT_MODULE_AUTOLOAD_LIMIT (MODULE_NAME_LEN - sizeof("nft-expr-255-"))
28 unsigned int nf_tables_net_id __read_mostly;
30 static LIST_HEAD(nf_tables_expressions);
31 static LIST_HEAD(nf_tables_objects);
32 static LIST_HEAD(nf_tables_flowtables);
33 static LIST_HEAD(nf_tables_destroy_list);
34 static LIST_HEAD(nf_tables_gc_list);
35 static DEFINE_SPINLOCK(nf_tables_destroy_list_lock);
36 static DEFINE_SPINLOCK(nf_tables_gc_list_lock);
39 NFT_VALIDATE_SKIP = 0,
44 static struct rhltable nft_objname_ht;
46 static u32 nft_chain_hash(const void *data, u32 len, u32 seed);
47 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed);
48 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *, const void *);
50 static u32 nft_objname_hash(const void *data, u32 len, u32 seed);
51 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed);
52 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *, const void *);
54 static const struct rhashtable_params nft_chain_ht_params = {
55 .head_offset = offsetof(struct nft_chain, rhlhead),
56 .key_offset = offsetof(struct nft_chain, name),
57 .hashfn = nft_chain_hash,
58 .obj_hashfn = nft_chain_hash_obj,
59 .obj_cmpfn = nft_chain_hash_cmp,
60 .automatic_shrinking = true,
63 static const struct rhashtable_params nft_objname_ht_params = {
64 .head_offset = offsetof(struct nft_object, rhlhead),
65 .key_offset = offsetof(struct nft_object, key),
66 .hashfn = nft_objname_hash,
67 .obj_hashfn = nft_objname_hash_obj,
68 .obj_cmpfn = nft_objname_hash_cmp,
69 .automatic_shrinking = true,
72 struct nft_audit_data {
73 struct nft_table *table;
76 struct list_head list;
79 static const u8 nft2audit_op[NFT_MSG_MAX] = { // enum nf_tables_msg_types
80 [NFT_MSG_NEWTABLE] = AUDIT_NFT_OP_TABLE_REGISTER,
81 [NFT_MSG_GETTABLE] = AUDIT_NFT_OP_INVALID,
82 [NFT_MSG_DELTABLE] = AUDIT_NFT_OP_TABLE_UNREGISTER,
83 [NFT_MSG_NEWCHAIN] = AUDIT_NFT_OP_CHAIN_REGISTER,
84 [NFT_MSG_GETCHAIN] = AUDIT_NFT_OP_INVALID,
85 [NFT_MSG_DELCHAIN] = AUDIT_NFT_OP_CHAIN_UNREGISTER,
86 [NFT_MSG_NEWRULE] = AUDIT_NFT_OP_RULE_REGISTER,
87 [NFT_MSG_GETRULE] = AUDIT_NFT_OP_INVALID,
88 [NFT_MSG_DELRULE] = AUDIT_NFT_OP_RULE_UNREGISTER,
89 [NFT_MSG_NEWSET] = AUDIT_NFT_OP_SET_REGISTER,
90 [NFT_MSG_GETSET] = AUDIT_NFT_OP_INVALID,
91 [NFT_MSG_DELSET] = AUDIT_NFT_OP_SET_UNREGISTER,
92 [NFT_MSG_NEWSETELEM] = AUDIT_NFT_OP_SETELEM_REGISTER,
93 [NFT_MSG_GETSETELEM] = AUDIT_NFT_OP_INVALID,
94 [NFT_MSG_DELSETELEM] = AUDIT_NFT_OP_SETELEM_UNREGISTER,
95 [NFT_MSG_NEWGEN] = AUDIT_NFT_OP_GEN_REGISTER,
96 [NFT_MSG_GETGEN] = AUDIT_NFT_OP_INVALID,
97 [NFT_MSG_TRACE] = AUDIT_NFT_OP_INVALID,
98 [NFT_MSG_NEWOBJ] = AUDIT_NFT_OP_OBJ_REGISTER,
99 [NFT_MSG_GETOBJ] = AUDIT_NFT_OP_INVALID,
100 [NFT_MSG_DELOBJ] = AUDIT_NFT_OP_OBJ_UNREGISTER,
101 [NFT_MSG_GETOBJ_RESET] = AUDIT_NFT_OP_OBJ_RESET,
102 [NFT_MSG_NEWFLOWTABLE] = AUDIT_NFT_OP_FLOWTABLE_REGISTER,
103 [NFT_MSG_GETFLOWTABLE] = AUDIT_NFT_OP_INVALID,
104 [NFT_MSG_DELFLOWTABLE] = AUDIT_NFT_OP_FLOWTABLE_UNREGISTER,
105 [NFT_MSG_GETSETELEM_RESET] = AUDIT_NFT_OP_SETELEM_RESET,
108 static void nft_validate_state_update(struct nft_table *table, u8 new_validate_state)
110 switch (table->validate_state) {
111 case NFT_VALIDATE_SKIP:
112 WARN_ON_ONCE(new_validate_state == NFT_VALIDATE_DO);
114 case NFT_VALIDATE_NEED:
116 case NFT_VALIDATE_DO:
117 if (new_validate_state == NFT_VALIDATE_NEED)
121 table->validate_state = new_validate_state;
123 static void nf_tables_trans_destroy_work(struct work_struct *w);
124 static DECLARE_WORK(trans_destroy_work, nf_tables_trans_destroy_work);
126 static void nft_trans_gc_work(struct work_struct *work);
127 static DECLARE_WORK(trans_gc_work, nft_trans_gc_work);
129 static void nft_ctx_init(struct nft_ctx *ctx,
131 const struct sk_buff *skb,
132 const struct nlmsghdr *nlh,
134 struct nft_table *table,
135 struct nft_chain *chain,
136 const struct nlattr * const *nla)
139 ctx->family = family;
144 ctx->portid = NETLINK_CB(skb).portid;
145 ctx->report = nlmsg_report(nlh);
146 ctx->flags = nlh->nlmsg_flags;
147 ctx->seq = nlh->nlmsg_seq;
150 static struct nft_trans *nft_trans_alloc_gfp(const struct nft_ctx *ctx,
151 int msg_type, u32 size, gfp_t gfp)
153 struct nft_trans *trans;
155 trans = kzalloc(sizeof(struct nft_trans) + size, gfp);
159 INIT_LIST_HEAD(&trans->list);
160 INIT_LIST_HEAD(&trans->binding_list);
161 trans->msg_type = msg_type;
167 static struct nft_trans *nft_trans_alloc(const struct nft_ctx *ctx,
168 int msg_type, u32 size)
170 return nft_trans_alloc_gfp(ctx, msg_type, size, GFP_KERNEL);
173 static void nft_trans_list_del(struct nft_trans *trans)
175 list_del(&trans->list);
176 list_del(&trans->binding_list);
179 static void nft_trans_destroy(struct nft_trans *trans)
181 nft_trans_list_del(trans);
185 static void __nft_set_trans_bind(const struct nft_ctx *ctx, struct nft_set *set,
188 struct nftables_pernet *nft_net;
189 struct net *net = ctx->net;
190 struct nft_trans *trans;
192 if (!nft_set_is_anonymous(set))
195 nft_net = nft_pernet(net);
196 list_for_each_entry_reverse(trans, &nft_net->commit_list, list) {
197 switch (trans->msg_type) {
199 if (nft_trans_set(trans) == set)
200 nft_trans_set_bound(trans) = bind;
202 case NFT_MSG_NEWSETELEM:
203 if (nft_trans_elem_set(trans) == set)
204 nft_trans_elem_set_bound(trans) = bind;
210 static void nft_set_trans_bind(const struct nft_ctx *ctx, struct nft_set *set)
212 return __nft_set_trans_bind(ctx, set, true);
215 static void nft_set_trans_unbind(const struct nft_ctx *ctx, struct nft_set *set)
217 return __nft_set_trans_bind(ctx, set, false);
220 static void __nft_chain_trans_bind(const struct nft_ctx *ctx,
221 struct nft_chain *chain, bool bind)
223 struct nftables_pernet *nft_net;
224 struct net *net = ctx->net;
225 struct nft_trans *trans;
227 if (!nft_chain_binding(chain))
230 nft_net = nft_pernet(net);
231 list_for_each_entry_reverse(trans, &nft_net->commit_list, list) {
232 switch (trans->msg_type) {
233 case NFT_MSG_NEWCHAIN:
234 if (nft_trans_chain(trans) == chain)
235 nft_trans_chain_bound(trans) = bind;
237 case NFT_MSG_NEWRULE:
238 if (trans->ctx.chain == chain)
239 nft_trans_rule_bound(trans) = bind;
245 static void nft_chain_trans_bind(const struct nft_ctx *ctx,
246 struct nft_chain *chain)
248 __nft_chain_trans_bind(ctx, chain, true);
251 int nf_tables_bind_chain(const struct nft_ctx *ctx, struct nft_chain *chain)
253 if (!nft_chain_binding(chain))
256 if (nft_chain_binding(ctx->chain))
262 if (!nft_use_inc(&chain->use))
266 nft_chain_trans_bind(ctx, chain);
271 void nf_tables_unbind_chain(const struct nft_ctx *ctx, struct nft_chain *chain)
273 __nft_chain_trans_bind(ctx, chain, false);
276 static int nft_netdev_register_hooks(struct net *net,
277 struct list_head *hook_list)
279 struct nft_hook *hook;
283 list_for_each_entry(hook, hook_list, list) {
284 err = nf_register_net_hook(net, &hook->ops);
293 list_for_each_entry(hook, hook_list, list) {
297 nf_unregister_net_hook(net, &hook->ops);
302 static void nft_netdev_unregister_hooks(struct net *net,
303 struct list_head *hook_list,
306 struct nft_hook *hook, *next;
308 list_for_each_entry_safe(hook, next, hook_list, list) {
309 nf_unregister_net_hook(net, &hook->ops);
310 if (release_netdev) {
311 list_del(&hook->list);
312 kfree_rcu(hook, rcu);
317 static int nf_tables_register_hook(struct net *net,
318 const struct nft_table *table,
319 struct nft_chain *chain)
321 struct nft_base_chain *basechain;
322 const struct nf_hook_ops *ops;
324 if (table->flags & NFT_TABLE_F_DORMANT ||
325 !nft_is_base_chain(chain))
328 basechain = nft_base_chain(chain);
329 ops = &basechain->ops;
331 if (basechain->type->ops_register)
332 return basechain->type->ops_register(net, ops);
334 if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
335 return nft_netdev_register_hooks(net, &basechain->hook_list);
337 return nf_register_net_hook(net, &basechain->ops);
340 static void __nf_tables_unregister_hook(struct net *net,
341 const struct nft_table *table,
342 struct nft_chain *chain,
345 struct nft_base_chain *basechain;
346 const struct nf_hook_ops *ops;
348 if (table->flags & NFT_TABLE_F_DORMANT ||
349 !nft_is_base_chain(chain))
351 basechain = nft_base_chain(chain);
352 ops = &basechain->ops;
354 if (basechain->type->ops_unregister)
355 return basechain->type->ops_unregister(net, ops);
357 if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
358 nft_netdev_unregister_hooks(net, &basechain->hook_list,
361 nf_unregister_net_hook(net, &basechain->ops);
364 static void nf_tables_unregister_hook(struct net *net,
365 const struct nft_table *table,
366 struct nft_chain *chain)
368 return __nf_tables_unregister_hook(net, table, chain, false);
371 static void nft_trans_commit_list_add_tail(struct net *net, struct nft_trans *trans)
373 struct nftables_pernet *nft_net = nft_pernet(net);
375 switch (trans->msg_type) {
377 if (!nft_trans_set_update(trans) &&
378 nft_set_is_anonymous(nft_trans_set(trans)))
379 list_add_tail(&trans->binding_list, &nft_net->binding_list);
381 case NFT_MSG_NEWCHAIN:
382 if (!nft_trans_chain_update(trans) &&
383 nft_chain_binding(nft_trans_chain(trans)))
384 list_add_tail(&trans->binding_list, &nft_net->binding_list);
388 list_add_tail(&trans->list, &nft_net->commit_list);
391 static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type)
393 struct nft_trans *trans;
395 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table));
399 if (msg_type == NFT_MSG_NEWTABLE)
400 nft_activate_next(ctx->net, ctx->table);
402 nft_trans_commit_list_add_tail(ctx->net, trans);
406 static int nft_deltable(struct nft_ctx *ctx)
410 err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE);
414 nft_deactivate_next(ctx->net, ctx->table);
418 static struct nft_trans *nft_trans_chain_add(struct nft_ctx *ctx, int msg_type)
420 struct nft_trans *trans;
422 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain));
424 return ERR_PTR(-ENOMEM);
426 if (msg_type == NFT_MSG_NEWCHAIN) {
427 nft_activate_next(ctx->net, ctx->chain);
429 if (ctx->nla[NFTA_CHAIN_ID]) {
430 nft_trans_chain_id(trans) =
431 ntohl(nla_get_be32(ctx->nla[NFTA_CHAIN_ID]));
434 nft_trans_chain(trans) = ctx->chain;
435 nft_trans_commit_list_add_tail(ctx->net, trans);
440 static int nft_delchain(struct nft_ctx *ctx)
442 struct nft_trans *trans;
444 trans = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN);
446 return PTR_ERR(trans);
448 nft_use_dec(&ctx->table->use);
449 nft_deactivate_next(ctx->net, ctx->chain);
454 void nft_rule_expr_activate(const struct nft_ctx *ctx, struct nft_rule *rule)
456 struct nft_expr *expr;
458 expr = nft_expr_first(rule);
459 while (nft_expr_more(rule, expr)) {
460 if (expr->ops->activate)
461 expr->ops->activate(ctx, expr);
463 expr = nft_expr_next(expr);
467 void nft_rule_expr_deactivate(const struct nft_ctx *ctx, struct nft_rule *rule,
468 enum nft_trans_phase phase)
470 struct nft_expr *expr;
472 expr = nft_expr_first(rule);
473 while (nft_expr_more(rule, expr)) {
474 if (expr->ops->deactivate)
475 expr->ops->deactivate(ctx, expr, phase);
477 expr = nft_expr_next(expr);
482 nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule)
484 /* You cannot delete the same rule twice */
485 if (nft_is_active_next(ctx->net, rule)) {
486 nft_deactivate_next(ctx->net, rule);
487 nft_use_dec(&ctx->chain->use);
493 static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type,
494 struct nft_rule *rule)
496 struct nft_trans *trans;
498 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule));
502 if (msg_type == NFT_MSG_NEWRULE && ctx->nla[NFTA_RULE_ID] != NULL) {
503 nft_trans_rule_id(trans) =
504 ntohl(nla_get_be32(ctx->nla[NFTA_RULE_ID]));
506 nft_trans_rule(trans) = rule;
507 nft_trans_commit_list_add_tail(ctx->net, trans);
512 static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule)
514 struct nft_flow_rule *flow;
515 struct nft_trans *trans;
518 trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule);
522 if (ctx->chain->flags & NFT_CHAIN_HW_OFFLOAD) {
523 flow = nft_flow_rule_create(ctx->net, rule);
525 nft_trans_destroy(trans);
526 return PTR_ERR(flow);
529 nft_trans_flow_rule(trans) = flow;
532 err = nf_tables_delrule_deactivate(ctx, rule);
534 nft_trans_destroy(trans);
537 nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_PREPARE);
542 static int nft_delrule_by_chain(struct nft_ctx *ctx)
544 struct nft_rule *rule;
547 list_for_each_entry(rule, &ctx->chain->rules, list) {
548 if (!nft_is_active_next(ctx->net, rule))
551 err = nft_delrule(ctx, rule);
558 static int __nft_trans_set_add(const struct nft_ctx *ctx, int msg_type,
560 const struct nft_set_desc *desc)
562 struct nft_trans *trans;
564 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
568 if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] && !desc) {
569 nft_trans_set_id(trans) =
570 ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
571 nft_activate_next(ctx->net, set);
573 nft_trans_set(trans) = set;
575 nft_trans_set_update(trans) = true;
576 nft_trans_set_gc_int(trans) = desc->gc_int;
577 nft_trans_set_timeout(trans) = desc->timeout;
578 nft_trans_set_size(trans) = desc->size;
580 nft_trans_commit_list_add_tail(ctx->net, trans);
585 static int nft_trans_set_add(const struct nft_ctx *ctx, int msg_type,
588 return __nft_trans_set_add(ctx, msg_type, set, NULL);
591 static int nft_mapelem_deactivate(const struct nft_ctx *ctx,
593 const struct nft_set_iter *iter,
594 struct nft_set_elem *elem)
596 nft_setelem_data_deactivate(ctx->net, set, elem);
601 struct nft_set_elem_catchall {
602 struct list_head list;
607 static void nft_map_catchall_deactivate(const struct nft_ctx *ctx,
610 u8 genmask = nft_genmask_next(ctx->net);
611 struct nft_set_elem_catchall *catchall;
612 struct nft_set_elem elem;
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 elem.priv = catchall->elem;
621 nft_setelem_data_deactivate(ctx->net, set, &elem);
626 static void nft_map_deactivate(const struct nft_ctx *ctx, struct nft_set *set)
628 struct nft_set_iter iter = {
629 .genmask = nft_genmask_next(ctx->net),
630 .fn = nft_mapelem_deactivate,
633 set->ops->walk(ctx, set, &iter);
634 WARN_ON_ONCE(iter.err);
636 nft_map_catchall_deactivate(ctx, set);
639 static int nft_delset(const struct nft_ctx *ctx, struct nft_set *set)
643 err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set);
647 if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
648 nft_map_deactivate(ctx, set);
650 nft_deactivate_next(ctx->net, set);
651 nft_use_dec(&ctx->table->use);
656 static int nft_trans_obj_add(struct nft_ctx *ctx, int msg_type,
657 struct nft_object *obj)
659 struct nft_trans *trans;
661 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_obj));
665 if (msg_type == NFT_MSG_NEWOBJ)
666 nft_activate_next(ctx->net, obj);
668 nft_trans_obj(trans) = obj;
669 nft_trans_commit_list_add_tail(ctx->net, trans);
674 static int nft_delobj(struct nft_ctx *ctx, struct nft_object *obj)
678 err = nft_trans_obj_add(ctx, NFT_MSG_DELOBJ, obj);
682 nft_deactivate_next(ctx->net, obj);
683 nft_use_dec(&ctx->table->use);
688 static int 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));
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)
713 err = nft_trans_flowtable_add(ctx, NFT_MSG_DELFLOWTABLE, flowtable);
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 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 nft_active_genmask(table, genmask)) {
817 if (nft_table_has_owner(table) &&
818 nlpid && table->nlpid != nlpid)
819 return ERR_PTR(-EPERM);
825 return ERR_PTR(-ENOENT);
828 static inline u64 nf_tables_alloc_handle(struct nft_table *table)
830 return ++table->hgenerator;
833 static const struct nft_chain_type *chain_type[NFPROTO_NUMPROTO][NFT_CHAIN_T_MAX];
835 static const struct nft_chain_type *
836 __nft_chain_type_get(u8 family, enum nft_chain_types type)
838 if (family >= NFPROTO_NUMPROTO ||
839 type >= NFT_CHAIN_T_MAX)
842 return chain_type[family][type];
845 static const struct nft_chain_type *
846 __nf_tables_chain_type_lookup(const struct nlattr *nla, u8 family)
848 const struct nft_chain_type *type;
851 for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
852 type = __nft_chain_type_get(family, i);
855 if (!nla_strcmp(nla, type->name))
861 struct nft_module_request {
862 struct list_head list;
863 char module[MODULE_NAME_LEN];
867 #ifdef CONFIG_MODULES
868 __printf(2, 3) int nft_request_module(struct net *net, const char *fmt,
871 char module_name[MODULE_NAME_LEN];
872 struct nftables_pernet *nft_net;
873 struct nft_module_request *req;
878 ret = vsnprintf(module_name, MODULE_NAME_LEN, fmt, args);
880 if (ret >= MODULE_NAME_LEN)
883 nft_net = nft_pernet(net);
884 list_for_each_entry(req, &nft_net->module_list, list) {
885 if (!strcmp(req->module, module_name)) {
889 /* A request to load this module already exists. */
894 req = kmalloc(sizeof(*req), GFP_KERNEL);
899 strscpy(req->module, module_name, MODULE_NAME_LEN);
900 list_add_tail(&req->list, &nft_net->module_list);
904 EXPORT_SYMBOL_GPL(nft_request_module);
907 static void lockdep_nfnl_nft_mutex_not_held(void)
909 #ifdef CONFIG_PROVE_LOCKING
911 WARN_ON_ONCE(lockdep_nfnl_is_held(NFNL_SUBSYS_NFTABLES));
915 static const struct nft_chain_type *
916 nf_tables_chain_type_lookup(struct net *net, const struct nlattr *nla,
917 u8 family, bool autoload)
919 const struct nft_chain_type *type;
921 type = __nf_tables_chain_type_lookup(nla, family);
925 lockdep_nfnl_nft_mutex_not_held();
926 #ifdef CONFIG_MODULES
928 if (nft_request_module(net, "nft-chain-%u-%.*s", family,
930 (const char *)nla_data(nla)) == -EAGAIN)
931 return ERR_PTR(-EAGAIN);
934 return ERR_PTR(-ENOENT);
937 static __be16 nft_base_seq(const struct net *net)
939 struct nftables_pernet *nft_net = nft_pernet(net);
941 return htons(nft_net->base_seq & 0xffff);
944 static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
945 [NFTA_TABLE_NAME] = { .type = NLA_STRING,
946 .len = NFT_TABLE_MAXNAMELEN - 1 },
947 [NFTA_TABLE_FLAGS] = { .type = NLA_U32 },
948 [NFTA_TABLE_HANDLE] = { .type = NLA_U64 },
949 [NFTA_TABLE_USERDATA] = { .type = NLA_BINARY,
950 .len = NFT_USERDATA_MAXLEN }
953 static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
954 u32 portid, u32 seq, int event, u32 flags,
955 int family, const struct nft_table *table)
957 struct nlmsghdr *nlh;
959 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
960 nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
961 NFNETLINK_V0, nft_base_seq(net));
963 goto nla_put_failure;
965 if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
966 nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)) ||
967 nla_put_be64(skb, NFTA_TABLE_HANDLE, cpu_to_be64(table->handle),
969 goto nla_put_failure;
971 if (event == NFT_MSG_DELTABLE) {
976 if (nla_put_be32(skb, NFTA_TABLE_FLAGS,
977 htonl(table->flags & NFT_TABLE_F_MASK)))
978 goto nla_put_failure;
980 if (nft_table_has_owner(table) &&
981 nla_put_be32(skb, NFTA_TABLE_OWNER, htonl(table->nlpid)))
982 goto nla_put_failure;
985 if (nla_put(skb, NFTA_TABLE_USERDATA, table->udlen, table->udata))
986 goto nla_put_failure;
993 nlmsg_trim(skb, nlh);
997 struct nftnl_skb_parms {
1000 #define NFT_CB(skb) (*(struct nftnl_skb_parms*)&((skb)->cb))
1002 static void nft_notify_enqueue(struct sk_buff *skb, bool report,
1003 struct list_head *notify_list)
1005 NFT_CB(skb).report = report;
1006 list_add_tail(&skb->list, notify_list);
1009 static void nf_tables_table_notify(const struct nft_ctx *ctx, int event)
1011 struct nftables_pernet *nft_net;
1012 struct sk_buff *skb;
1017 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1020 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1024 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
1025 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
1027 err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
1028 event, flags, ctx->family, ctx->table);
1034 nft_net = nft_pernet(ctx->net);
1035 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
1038 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
1041 static int nf_tables_dump_tables(struct sk_buff *skb,
1042 struct netlink_callback *cb)
1044 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1045 struct nftables_pernet *nft_net;
1046 const struct nft_table *table;
1047 unsigned int idx = 0, s_idx = cb->args[0];
1048 struct net *net = sock_net(skb->sk);
1049 int family = nfmsg->nfgen_family;
1052 nft_net = nft_pernet(net);
1053 cb->seq = READ_ONCE(nft_net->base_seq);
1055 list_for_each_entry_rcu(table, &nft_net->tables, list) {
1056 if (family != NFPROTO_UNSPEC && family != table->family)
1062 memset(&cb->args[1], 0,
1063 sizeof(cb->args) - sizeof(cb->args[0]));
1064 if (!nft_is_active(net, table))
1066 if (nf_tables_fill_table_info(skb, net,
1067 NETLINK_CB(cb->skb).portid,
1069 NFT_MSG_NEWTABLE, NLM_F_MULTI,
1070 table->family, table) < 0)
1073 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1083 static int nft_netlink_dump_start_rcu(struct sock *nlsk, struct sk_buff *skb,
1084 const struct nlmsghdr *nlh,
1085 struct netlink_dump_control *c)
1089 if (!try_module_get(THIS_MODULE))
1093 err = netlink_dump_start(nlsk, skb, nlh, c);
1095 module_put(THIS_MODULE);
1100 /* called with rcu_read_lock held */
1101 static int nf_tables_gettable(struct sk_buff *skb, const struct nfnl_info *info,
1102 const struct nlattr * const nla[])
1104 struct netlink_ext_ack *extack = info->extack;
1105 u8 genmask = nft_genmask_cur(info->net);
1106 u8 family = info->nfmsg->nfgen_family;
1107 const struct nft_table *table;
1108 struct net *net = info->net;
1109 struct sk_buff *skb2;
1112 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
1113 struct netlink_dump_control c = {
1114 .dump = nf_tables_dump_tables,
1115 .module = THIS_MODULE,
1118 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
1121 table = nft_table_lookup(net, nla[NFTA_TABLE_NAME], family, genmask, 0);
1122 if (IS_ERR(table)) {
1123 NL_SET_BAD_ATTR(extack, nla[NFTA_TABLE_NAME]);
1124 return PTR_ERR(table);
1127 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1131 err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
1132 info->nlh->nlmsg_seq, NFT_MSG_NEWTABLE,
1135 goto err_fill_table_info;
1137 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
1139 err_fill_table_info:
1144 static void nft_table_disable(struct net *net, struct nft_table *table, u32 cnt)
1146 struct nft_chain *chain;
1149 list_for_each_entry(chain, &table->chains, list) {
1150 if (!nft_is_active_next(net, chain))
1152 if (!nft_is_base_chain(chain))
1155 if (cnt && i++ == cnt)
1158 nf_tables_unregister_hook(net, table, chain);
1162 static int nf_tables_table_enable(struct net *net, struct nft_table *table)
1164 struct nft_chain *chain;
1167 list_for_each_entry(chain, &table->chains, list) {
1168 if (!nft_is_active_next(net, chain))
1170 if (!nft_is_base_chain(chain))
1173 err = nf_tables_register_hook(net, table, chain);
1175 goto err_register_hooks;
1183 nft_table_disable(net, table, i);
1187 static void nf_tables_table_disable(struct net *net, struct nft_table *table)
1189 table->flags &= ~NFT_TABLE_F_DORMANT;
1190 nft_table_disable(net, table, 0);
1191 table->flags |= NFT_TABLE_F_DORMANT;
1194 #define __NFT_TABLE_F_INTERNAL (NFT_TABLE_F_MASK + 1)
1195 #define __NFT_TABLE_F_WAS_DORMANT (__NFT_TABLE_F_INTERNAL << 0)
1196 #define __NFT_TABLE_F_WAS_AWAKEN (__NFT_TABLE_F_INTERNAL << 1)
1197 #define __NFT_TABLE_F_UPDATE (__NFT_TABLE_F_WAS_DORMANT | \
1198 __NFT_TABLE_F_WAS_AWAKEN)
1200 static int nf_tables_updtable(struct nft_ctx *ctx)
1202 struct nft_trans *trans;
1206 if (!ctx->nla[NFTA_TABLE_FLAGS])
1209 flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
1210 if (flags & ~NFT_TABLE_F_MASK)
1213 if (flags == ctx->table->flags)
1216 if ((nft_table_has_owner(ctx->table) &&
1217 !(flags & NFT_TABLE_F_OWNER)) ||
1218 (!nft_table_has_owner(ctx->table) &&
1219 flags & NFT_TABLE_F_OWNER))
1222 /* No dormant off/on/off/on games in single transaction */
1223 if (ctx->table->flags & __NFT_TABLE_F_UPDATE)
1226 trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
1227 sizeof(struct nft_trans_table));
1231 if ((flags & NFT_TABLE_F_DORMANT) &&
1232 !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
1233 ctx->table->flags |= NFT_TABLE_F_DORMANT;
1234 if (!(ctx->table->flags & __NFT_TABLE_F_UPDATE))
1235 ctx->table->flags |= __NFT_TABLE_F_WAS_AWAKEN;
1236 } else if (!(flags & NFT_TABLE_F_DORMANT) &&
1237 ctx->table->flags & NFT_TABLE_F_DORMANT) {
1238 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
1239 if (!(ctx->table->flags & __NFT_TABLE_F_UPDATE)) {
1240 ret = nf_tables_table_enable(ctx->net, ctx->table);
1242 goto err_register_hooks;
1244 ctx->table->flags |= __NFT_TABLE_F_WAS_DORMANT;
1248 nft_trans_table_update(trans) = true;
1249 nft_trans_commit_list_add_tail(ctx->net, trans);
1254 nft_trans_destroy(trans);
1258 static u32 nft_chain_hash(const void *data, u32 len, u32 seed)
1260 const char *name = data;
1262 return jhash(name, strlen(name), seed);
1265 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed)
1267 const struct nft_chain *chain = data;
1269 return nft_chain_hash(chain->name, 0, seed);
1272 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *arg,
1275 const struct nft_chain *chain = ptr;
1276 const char *name = arg->key;
1278 return strcmp(chain->name, name);
1281 static u32 nft_objname_hash(const void *data, u32 len, u32 seed)
1283 const struct nft_object_hash_key *k = data;
1285 seed ^= hash_ptr(k->table, 32);
1287 return jhash(k->name, strlen(k->name), seed);
1290 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed)
1292 const struct nft_object *obj = data;
1294 return nft_objname_hash(&obj->key, 0, seed);
1297 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *arg,
1300 const struct nft_object_hash_key *k = arg->key;
1301 const struct nft_object *obj = ptr;
1303 if (obj->key.table != k->table)
1306 return strcmp(obj->key.name, k->name);
1309 static bool nft_supported_family(u8 family)
1312 #ifdef CONFIG_NF_TABLES_INET
1313 || family == NFPROTO_INET
1315 #ifdef CONFIG_NF_TABLES_IPV4
1316 || family == NFPROTO_IPV4
1318 #ifdef CONFIG_NF_TABLES_ARP
1319 || family == NFPROTO_ARP
1321 #ifdef CONFIG_NF_TABLES_NETDEV
1322 || family == NFPROTO_NETDEV
1324 #if IS_ENABLED(CONFIG_NF_TABLES_BRIDGE)
1325 || family == NFPROTO_BRIDGE
1327 #ifdef CONFIG_NF_TABLES_IPV6
1328 || family == NFPROTO_IPV6
1333 static int nf_tables_newtable(struct sk_buff *skb, const struct nfnl_info *info,
1334 const struct nlattr * const nla[])
1336 struct nftables_pernet *nft_net = nft_pernet(info->net);
1337 struct netlink_ext_ack *extack = info->extack;
1338 u8 genmask = nft_genmask_next(info->net);
1339 u8 family = info->nfmsg->nfgen_family;
1340 struct net *net = info->net;
1341 const struct nlattr *attr;
1342 struct nft_table *table;
1347 if (!nft_supported_family(family))
1350 lockdep_assert_held(&nft_net->commit_mutex);
1351 attr = nla[NFTA_TABLE_NAME];
1352 table = nft_table_lookup(net, attr, family, genmask,
1353 NETLINK_CB(skb).portid);
1354 if (IS_ERR(table)) {
1355 if (PTR_ERR(table) != -ENOENT)
1356 return PTR_ERR(table);
1358 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
1359 NL_SET_BAD_ATTR(extack, attr);
1362 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
1365 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
1367 return nf_tables_updtable(&ctx);
1370 if (nla[NFTA_TABLE_FLAGS]) {
1371 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
1372 if (flags & ~NFT_TABLE_F_MASK)
1377 table = kzalloc(sizeof(*table), GFP_KERNEL_ACCOUNT);
1381 table->validate_state = nft_net->validate_state;
1382 table->name = nla_strdup(attr, GFP_KERNEL_ACCOUNT);
1383 if (table->name == NULL)
1386 if (nla[NFTA_TABLE_USERDATA]) {
1387 table->udata = nla_memdup(nla[NFTA_TABLE_USERDATA], GFP_KERNEL_ACCOUNT);
1388 if (table->udata == NULL)
1389 goto err_table_udata;
1391 table->udlen = nla_len(nla[NFTA_TABLE_USERDATA]);
1394 err = rhltable_init(&table->chains_ht, &nft_chain_ht_params);
1398 INIT_LIST_HEAD(&table->chains);
1399 INIT_LIST_HEAD(&table->sets);
1400 INIT_LIST_HEAD(&table->objects);
1401 INIT_LIST_HEAD(&table->flowtables);
1402 table->family = family;
1403 table->flags = flags;
1404 table->handle = ++nft_net->table_handle;
1405 if (table->flags & NFT_TABLE_F_OWNER)
1406 table->nlpid = NETLINK_CB(skb).portid;
1408 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
1409 err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
1413 list_add_tail_rcu(&table->list, &nft_net->tables);
1416 rhltable_destroy(&table->chains_ht);
1418 kfree(table->udata);
1427 static int nft_flush_table(struct nft_ctx *ctx)
1429 struct nft_flowtable *flowtable, *nft;
1430 struct nft_chain *chain, *nc;
1431 struct nft_object *obj, *ne;
1432 struct nft_set *set, *ns;
1435 list_for_each_entry(chain, &ctx->table->chains, list) {
1436 if (!nft_is_active_next(ctx->net, chain))
1439 if (nft_chain_binding(chain))
1444 err = nft_delrule_by_chain(ctx);
1449 list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
1450 if (!nft_is_active_next(ctx->net, set))
1453 if (nft_set_is_anonymous(set))
1456 err = nft_delset(ctx, set);
1461 list_for_each_entry_safe(flowtable, nft, &ctx->table->flowtables, list) {
1462 if (!nft_is_active_next(ctx->net, flowtable))
1465 err = nft_delflowtable(ctx, flowtable);
1470 list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) {
1471 if (!nft_is_active_next(ctx->net, obj))
1474 err = nft_delobj(ctx, obj);
1479 list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
1480 if (!nft_is_active_next(ctx->net, chain))
1483 if (nft_chain_binding(chain))
1488 err = nft_delchain(ctx);
1493 err = nft_deltable(ctx);
1498 static int nft_flush(struct nft_ctx *ctx, int family)
1500 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
1501 const struct nlattr * const *nla = ctx->nla;
1502 struct nft_table *table, *nt;
1505 list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
1506 if (family != AF_UNSPEC && table->family != family)
1509 ctx->family = table->family;
1511 if (!nft_is_active_next(ctx->net, table))
1514 if (nft_table_has_owner(table) && table->nlpid != ctx->portid)
1517 if (nla[NFTA_TABLE_NAME] &&
1518 nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
1523 err = nft_flush_table(ctx);
1531 static int nf_tables_deltable(struct sk_buff *skb, const struct nfnl_info *info,
1532 const struct nlattr * const nla[])
1534 struct netlink_ext_ack *extack = info->extack;
1535 u8 genmask = nft_genmask_next(info->net);
1536 u8 family = info->nfmsg->nfgen_family;
1537 struct net *net = info->net;
1538 const struct nlattr *attr;
1539 struct nft_table *table;
1542 nft_ctx_init(&ctx, net, skb, info->nlh, 0, NULL, NULL, nla);
1543 if (family == AF_UNSPEC ||
1544 (!nla[NFTA_TABLE_NAME] && !nla[NFTA_TABLE_HANDLE]))
1545 return nft_flush(&ctx, family);
1547 if (nla[NFTA_TABLE_HANDLE]) {
1548 attr = nla[NFTA_TABLE_HANDLE];
1549 table = nft_table_lookup_byhandle(net, attr, genmask,
1550 NETLINK_CB(skb).portid);
1552 attr = nla[NFTA_TABLE_NAME];
1553 table = nft_table_lookup(net, attr, family, genmask,
1554 NETLINK_CB(skb).portid);
1557 if (IS_ERR(table)) {
1558 if (PTR_ERR(table) == -ENOENT &&
1559 NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYTABLE)
1562 NL_SET_BAD_ATTR(extack, attr);
1563 return PTR_ERR(table);
1566 if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
1570 ctx.family = family;
1573 return nft_flush_table(&ctx);
1576 static void nf_tables_table_destroy(struct nft_ctx *ctx)
1578 if (WARN_ON(ctx->table->use > 0))
1581 rhltable_destroy(&ctx->table->chains_ht);
1582 kfree(ctx->table->name);
1583 kfree(ctx->table->udata);
1587 void nft_register_chain_type(const struct nft_chain_type *ctype)
1589 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1590 if (WARN_ON(__nft_chain_type_get(ctype->family, ctype->type))) {
1591 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1594 chain_type[ctype->family][ctype->type] = ctype;
1595 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1597 EXPORT_SYMBOL_GPL(nft_register_chain_type);
1599 void nft_unregister_chain_type(const struct nft_chain_type *ctype)
1601 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1602 chain_type[ctype->family][ctype->type] = NULL;
1603 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1605 EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
1611 static struct nft_chain *
1612 nft_chain_lookup_byhandle(const struct nft_table *table, u64 handle, u8 genmask)
1614 struct nft_chain *chain;
1616 list_for_each_entry(chain, &table->chains, list) {
1617 if (chain->handle == handle &&
1618 nft_active_genmask(chain, genmask))
1622 return ERR_PTR(-ENOENT);
1625 static bool lockdep_commit_lock_is_held(const struct net *net)
1627 #ifdef CONFIG_PROVE_LOCKING
1628 struct nftables_pernet *nft_net = nft_pernet(net);
1630 return lockdep_is_held(&nft_net->commit_mutex);
1636 static struct nft_chain *nft_chain_lookup(struct net *net,
1637 struct nft_table *table,
1638 const struct nlattr *nla, u8 genmask)
1640 char search[NFT_CHAIN_MAXNAMELEN + 1];
1641 struct rhlist_head *tmp, *list;
1642 struct nft_chain *chain;
1645 return ERR_PTR(-EINVAL);
1647 nla_strscpy(search, nla, sizeof(search));
1649 WARN_ON(!rcu_read_lock_held() &&
1650 !lockdep_commit_lock_is_held(net));
1652 chain = ERR_PTR(-ENOENT);
1654 list = rhltable_lookup(&table->chains_ht, search, nft_chain_ht_params);
1658 rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
1659 if (nft_active_genmask(chain, genmask))
1662 chain = ERR_PTR(-ENOENT);
1668 static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
1669 [NFTA_CHAIN_TABLE] = { .type = NLA_STRING,
1670 .len = NFT_TABLE_MAXNAMELEN - 1 },
1671 [NFTA_CHAIN_HANDLE] = { .type = NLA_U64 },
1672 [NFTA_CHAIN_NAME] = { .type = NLA_STRING,
1673 .len = NFT_CHAIN_MAXNAMELEN - 1 },
1674 [NFTA_CHAIN_HOOK] = { .type = NLA_NESTED },
1675 [NFTA_CHAIN_POLICY] = { .type = NLA_U32 },
1676 [NFTA_CHAIN_TYPE] = { .type = NLA_STRING,
1677 .len = NFT_MODULE_AUTOLOAD_LIMIT },
1678 [NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED },
1679 [NFTA_CHAIN_FLAGS] = { .type = NLA_U32 },
1680 [NFTA_CHAIN_ID] = { .type = NLA_U32 },
1681 [NFTA_CHAIN_USERDATA] = { .type = NLA_BINARY,
1682 .len = NFT_USERDATA_MAXLEN },
1685 static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
1686 [NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 },
1687 [NFTA_HOOK_PRIORITY] = { .type = NLA_U32 },
1688 [NFTA_HOOK_DEV] = { .type = NLA_STRING,
1689 .len = IFNAMSIZ - 1 },
1692 static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
1694 struct nft_stats *cpu_stats, total;
1695 struct nlattr *nest;
1703 memset(&total, 0, sizeof(total));
1704 for_each_possible_cpu(cpu) {
1705 cpu_stats = per_cpu_ptr(stats, cpu);
1707 seq = u64_stats_fetch_begin(&cpu_stats->syncp);
1708 pkts = cpu_stats->pkts;
1709 bytes = cpu_stats->bytes;
1710 } while (u64_stats_fetch_retry(&cpu_stats->syncp, seq));
1712 total.bytes += bytes;
1714 nest = nla_nest_start_noflag(skb, NFTA_CHAIN_COUNTERS);
1716 goto nla_put_failure;
1718 if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts),
1719 NFTA_COUNTER_PAD) ||
1720 nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
1722 goto nla_put_failure;
1724 nla_nest_end(skb, nest);
1731 static int nft_dump_basechain_hook(struct sk_buff *skb, int family,
1732 const struct nft_base_chain *basechain,
1733 const struct list_head *hook_list)
1735 const struct nf_hook_ops *ops = &basechain->ops;
1736 struct nft_hook *hook, *first = NULL;
1737 struct nlattr *nest, *nest_devs;
1740 nest = nla_nest_start_noflag(skb, NFTA_CHAIN_HOOK);
1742 goto nla_put_failure;
1743 if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
1744 goto nla_put_failure;
1745 if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
1746 goto nla_put_failure;
1748 if (nft_base_chain_netdev(family, ops->hooknum)) {
1749 nest_devs = nla_nest_start_noflag(skb, NFTA_HOOK_DEVS);
1751 goto nla_put_failure;
1754 hook_list = &basechain->hook_list;
1756 list_for_each_entry(hook, hook_list, list) {
1760 if (nla_put_string(skb, NFTA_DEVICE_NAME,
1761 hook->ops.dev->name))
1762 goto nla_put_failure;
1765 nla_nest_end(skb, nest_devs);
1768 nla_put_string(skb, NFTA_HOOK_DEV, first->ops.dev->name))
1769 goto nla_put_failure;
1771 nla_nest_end(skb, nest);
1778 static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
1779 u32 portid, u32 seq, int event, u32 flags,
1780 int family, const struct nft_table *table,
1781 const struct nft_chain *chain,
1782 const struct list_head *hook_list)
1784 struct nlmsghdr *nlh;
1786 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
1787 nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
1788 NFNETLINK_V0, nft_base_seq(net));
1790 goto nla_put_failure;
1792 if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name) ||
1793 nla_put_string(skb, NFTA_CHAIN_NAME, chain->name) ||
1794 nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle),
1796 goto nla_put_failure;
1798 if (event == NFT_MSG_DELCHAIN && !hook_list) {
1799 nlmsg_end(skb, nlh);
1803 if (nft_is_base_chain(chain)) {
1804 const struct nft_base_chain *basechain = nft_base_chain(chain);
1805 struct nft_stats __percpu *stats;
1807 if (nft_dump_basechain_hook(skb, family, basechain, hook_list))
1808 goto nla_put_failure;
1810 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
1811 htonl(basechain->policy)))
1812 goto nla_put_failure;
1814 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
1815 goto nla_put_failure;
1817 stats = rcu_dereference_check(basechain->stats,
1818 lockdep_commit_lock_is_held(net));
1819 if (nft_dump_stats(skb, stats))
1820 goto nla_put_failure;
1824 nla_put_be32(skb, NFTA_CHAIN_FLAGS, htonl(chain->flags)))
1825 goto nla_put_failure;
1827 if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
1828 goto nla_put_failure;
1831 nla_put(skb, NFTA_CHAIN_USERDATA, chain->udlen, chain->udata))
1832 goto nla_put_failure;
1834 nlmsg_end(skb, nlh);
1838 nlmsg_trim(skb, nlh);
1842 static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event,
1843 const struct list_head *hook_list)
1845 struct nftables_pernet *nft_net;
1846 struct sk_buff *skb;
1851 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1854 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1858 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
1859 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
1861 err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
1862 event, flags, ctx->family, ctx->table,
1863 ctx->chain, hook_list);
1869 nft_net = nft_pernet(ctx->net);
1870 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
1873 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
1876 static int nf_tables_dump_chains(struct sk_buff *skb,
1877 struct netlink_callback *cb)
1879 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1880 unsigned int idx = 0, s_idx = cb->args[0];
1881 struct net *net = sock_net(skb->sk);
1882 int family = nfmsg->nfgen_family;
1883 struct nftables_pernet *nft_net;
1884 const struct nft_table *table;
1885 const struct nft_chain *chain;
1888 nft_net = nft_pernet(net);
1889 cb->seq = READ_ONCE(nft_net->base_seq);
1891 list_for_each_entry_rcu(table, &nft_net->tables, list) {
1892 if (family != NFPROTO_UNSPEC && family != table->family)
1895 list_for_each_entry_rcu(chain, &table->chains, list) {
1899 memset(&cb->args[1], 0,
1900 sizeof(cb->args) - sizeof(cb->args[0]));
1901 if (!nft_is_active(net, chain))
1903 if (nf_tables_fill_chain_info(skb, net,
1904 NETLINK_CB(cb->skb).portid,
1908 table->family, table,
1912 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1923 /* called with rcu_read_lock held */
1924 static int nf_tables_getchain(struct sk_buff *skb, const struct nfnl_info *info,
1925 const struct nlattr * const nla[])
1927 struct netlink_ext_ack *extack = info->extack;
1928 u8 genmask = nft_genmask_cur(info->net);
1929 u8 family = info->nfmsg->nfgen_family;
1930 const struct nft_chain *chain;
1931 struct net *net = info->net;
1932 struct nft_table *table;
1933 struct sk_buff *skb2;
1936 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
1937 struct netlink_dump_control c = {
1938 .dump = nf_tables_dump_chains,
1939 .module = THIS_MODULE,
1942 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
1945 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask, 0);
1946 if (IS_ERR(table)) {
1947 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
1948 return PTR_ERR(table);
1951 chain = nft_chain_lookup(net, table, nla[NFTA_CHAIN_NAME], genmask);
1952 if (IS_ERR(chain)) {
1953 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
1954 return PTR_ERR(chain);
1957 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1961 err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
1962 info->nlh->nlmsg_seq, NFT_MSG_NEWCHAIN,
1963 0, family, table, chain, NULL);
1965 goto err_fill_chain_info;
1967 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
1969 err_fill_chain_info:
1974 static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
1975 [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 },
1976 [NFTA_COUNTER_BYTES] = { .type = NLA_U64 },
1979 static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
1981 struct nlattr *tb[NFTA_COUNTER_MAX+1];
1982 struct nft_stats __percpu *newstats;
1983 struct nft_stats *stats;
1986 err = nla_parse_nested_deprecated(tb, NFTA_COUNTER_MAX, attr,
1987 nft_counter_policy, NULL);
1989 return ERR_PTR(err);
1991 if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
1992 return ERR_PTR(-EINVAL);
1994 newstats = netdev_alloc_pcpu_stats(struct nft_stats);
1995 if (newstats == NULL)
1996 return ERR_PTR(-ENOMEM);
1998 /* Restore old counters on this cpu, no problem. Per-cpu statistics
1999 * are not exposed to userspace.
2002 stats = this_cpu_ptr(newstats);
2003 stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
2004 stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
2010 static void nft_chain_stats_replace(struct nft_trans *trans)
2012 struct nft_base_chain *chain = nft_base_chain(trans->ctx.chain);
2014 if (!nft_trans_chain_stats(trans))
2017 nft_trans_chain_stats(trans) =
2018 rcu_replace_pointer(chain->stats, nft_trans_chain_stats(trans),
2019 lockdep_commit_lock_is_held(trans->ctx.net));
2021 if (!nft_trans_chain_stats(trans))
2022 static_branch_inc(&nft_counters_enabled);
2025 static void nf_tables_chain_free_chain_rules(struct nft_chain *chain)
2027 struct nft_rule_blob *g0 = rcu_dereference_raw(chain->blob_gen_0);
2028 struct nft_rule_blob *g1 = rcu_dereference_raw(chain->blob_gen_1);
2034 /* should be NULL either via abort or via successful commit */
2035 WARN_ON_ONCE(chain->blob_next);
2036 kvfree(chain->blob_next);
2039 void nf_tables_chain_destroy(struct nft_ctx *ctx)
2041 struct nft_chain *chain = ctx->chain;
2042 struct nft_hook *hook, *next;
2044 if (WARN_ON(chain->use > 0))
2047 /* no concurrent access possible anymore */
2048 nf_tables_chain_free_chain_rules(chain);
2050 if (nft_is_base_chain(chain)) {
2051 struct nft_base_chain *basechain = nft_base_chain(chain);
2053 if (nft_base_chain_netdev(ctx->family, basechain->ops.hooknum)) {
2054 list_for_each_entry_safe(hook, next,
2055 &basechain->hook_list, list) {
2056 list_del_rcu(&hook->list);
2057 kfree_rcu(hook, rcu);
2060 module_put(basechain->type->owner);
2061 if (rcu_access_pointer(basechain->stats)) {
2062 static_branch_dec(&nft_counters_enabled);
2063 free_percpu(rcu_dereference_raw(basechain->stats));
2066 kfree(chain->udata);
2070 kfree(chain->udata);
2075 static struct nft_hook *nft_netdev_hook_alloc(struct net *net,
2076 const struct nlattr *attr)
2078 struct net_device *dev;
2079 char ifname[IFNAMSIZ];
2080 struct nft_hook *hook;
2083 hook = kmalloc(sizeof(struct nft_hook), GFP_KERNEL_ACCOUNT);
2086 goto err_hook_alloc;
2089 nla_strscpy(ifname, attr, IFNAMSIZ);
2090 /* nf_tables_netdev_event() is called under rtnl_mutex, this is
2091 * indirectly serializing all the other holders of the commit_mutex with
2094 dev = __dev_get_by_name(net, ifname);
2099 hook->ops.dev = dev;
2106 return ERR_PTR(err);
2109 static struct nft_hook *nft_hook_list_find(struct list_head *hook_list,
2110 const struct nft_hook *this)
2112 struct nft_hook *hook;
2114 list_for_each_entry(hook, hook_list, list) {
2115 if (this->ops.dev == hook->ops.dev)
2122 static int nf_tables_parse_netdev_hooks(struct net *net,
2123 const struct nlattr *attr,
2124 struct list_head *hook_list,
2125 struct netlink_ext_ack *extack)
2127 struct nft_hook *hook, *next;
2128 const struct nlattr *tmp;
2129 int rem, n = 0, err;
2131 nla_for_each_nested(tmp, attr, rem) {
2132 if (nla_type(tmp) != NFTA_DEVICE_NAME) {
2137 hook = nft_netdev_hook_alloc(net, tmp);
2139 NL_SET_BAD_ATTR(extack, tmp);
2140 err = PTR_ERR(hook);
2143 if (nft_hook_list_find(hook_list, hook)) {
2144 NL_SET_BAD_ATTR(extack, tmp);
2149 list_add_tail(&hook->list, hook_list);
2152 if (n == NFT_NETDEVICE_MAX) {
2161 list_for_each_entry_safe(hook, next, hook_list, list) {
2162 list_del(&hook->list);
2168 struct nft_chain_hook {
2171 const struct nft_chain_type *type;
2172 struct list_head list;
2175 static int nft_chain_parse_netdev(struct net *net, struct nlattr *tb[],
2176 struct list_head *hook_list,
2177 struct netlink_ext_ack *extack, u32 flags)
2179 struct nft_hook *hook;
2182 if (tb[NFTA_HOOK_DEV]) {
2183 hook = nft_netdev_hook_alloc(net, tb[NFTA_HOOK_DEV]);
2185 NL_SET_BAD_ATTR(extack, tb[NFTA_HOOK_DEV]);
2186 return PTR_ERR(hook);
2189 list_add_tail(&hook->list, hook_list);
2190 } else if (tb[NFTA_HOOK_DEVS]) {
2191 err = nf_tables_parse_netdev_hooks(net, tb[NFTA_HOOK_DEVS],
2198 if (flags & NFT_CHAIN_HW_OFFLOAD &&
2199 list_empty(hook_list))
2205 static int nft_chain_parse_hook(struct net *net,
2206 struct nft_base_chain *basechain,
2207 const struct nlattr * const nla[],
2208 struct nft_chain_hook *hook, u8 family,
2209 u32 flags, struct netlink_ext_ack *extack)
2211 struct nftables_pernet *nft_net = nft_pernet(net);
2212 struct nlattr *ha[NFTA_HOOK_MAX + 1];
2213 const struct nft_chain_type *type;
2216 lockdep_assert_held(&nft_net->commit_mutex);
2217 lockdep_nfnl_nft_mutex_not_held();
2219 err = nla_parse_nested_deprecated(ha, NFTA_HOOK_MAX,
2220 nla[NFTA_CHAIN_HOOK],
2221 nft_hook_policy, NULL);
2226 if (!ha[NFTA_HOOK_HOOKNUM] ||
2227 !ha[NFTA_HOOK_PRIORITY]) {
2228 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2232 hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
2233 hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
2235 type = __nft_chain_type_get(family, NFT_CHAIN_T_DEFAULT);
2239 if (nla[NFTA_CHAIN_TYPE]) {
2240 type = nf_tables_chain_type_lookup(net, nla[NFTA_CHAIN_TYPE],
2243 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
2244 return PTR_ERR(type);
2247 if (hook->num >= NFT_MAX_HOOKS || !(type->hook_mask & (1 << hook->num)))
2250 if (type->type == NFT_CHAIN_T_NAT &&
2251 hook->priority <= NF_IP_PRI_CONNTRACK)
2254 if (ha[NFTA_HOOK_HOOKNUM]) {
2255 hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
2256 if (hook->num != basechain->ops.hooknum)
2259 if (ha[NFTA_HOOK_PRIORITY]) {
2260 hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
2261 if (hook->priority != basechain->ops.priority)
2265 type = basechain->type;
2268 if (!try_module_get(type->owner)) {
2269 if (nla[NFTA_CHAIN_TYPE])
2270 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
2276 INIT_LIST_HEAD(&hook->list);
2277 if (nft_base_chain_netdev(family, hook->num)) {
2278 err = nft_chain_parse_netdev(net, ha, &hook->list, extack, flags);
2280 module_put(type->owner);
2283 } else if (ha[NFTA_HOOK_DEV] || ha[NFTA_HOOK_DEVS]) {
2284 module_put(type->owner);
2291 static void nft_chain_release_hook(struct nft_chain_hook *hook)
2293 struct nft_hook *h, *next;
2295 list_for_each_entry_safe(h, next, &hook->list, list) {
2299 module_put(hook->type->owner);
2302 static void nft_last_rule(const struct nft_chain *chain, const void *ptr)
2304 struct nft_rule_dp_last *lrule;
2306 BUILD_BUG_ON(offsetof(struct nft_rule_dp_last, end) != 0);
2308 lrule = (struct nft_rule_dp_last *)ptr;
2309 lrule->end.is_last = 1;
2310 lrule->chain = chain;
2311 /* blob size does not include the trailer rule */
2314 static struct nft_rule_blob *nf_tables_chain_alloc_rules(const struct nft_chain *chain,
2317 struct nft_rule_blob *blob;
2322 size += sizeof(struct nft_rule_blob) + sizeof(struct nft_rule_dp_last);
2324 blob = kvmalloc(size, GFP_KERNEL_ACCOUNT);
2329 nft_last_rule(chain, blob->data);
2334 static void nft_basechain_hook_init(struct nf_hook_ops *ops, u8 family,
2335 const struct nft_chain_hook *hook,
2336 struct nft_chain *chain)
2339 ops->hooknum = hook->num;
2340 ops->priority = hook->priority;
2342 ops->hook = hook->type->hooks[ops->hooknum];
2343 ops->hook_ops_type = NF_HOOK_OP_NF_TABLES;
2346 static int nft_basechain_init(struct nft_base_chain *basechain, u8 family,
2347 struct nft_chain_hook *hook, u32 flags)
2349 struct nft_chain *chain;
2352 basechain->type = hook->type;
2353 INIT_LIST_HEAD(&basechain->hook_list);
2354 chain = &basechain->chain;
2356 if (nft_base_chain_netdev(family, hook->num)) {
2357 list_splice_init(&hook->list, &basechain->hook_list);
2358 list_for_each_entry(h, &basechain->hook_list, list)
2359 nft_basechain_hook_init(&h->ops, family, hook, chain);
2361 nft_basechain_hook_init(&basechain->ops, family, hook, chain);
2363 chain->flags |= NFT_CHAIN_BASE | flags;
2364 basechain->policy = NF_ACCEPT;
2365 if (chain->flags & NFT_CHAIN_HW_OFFLOAD &&
2366 !nft_chain_offload_support(basechain)) {
2367 list_splice_init(&basechain->hook_list, &hook->list);
2371 flow_block_init(&basechain->flow_block);
2376 int nft_chain_add(struct nft_table *table, struct nft_chain *chain)
2380 err = rhltable_insert_key(&table->chains_ht, chain->name,
2381 &chain->rhlhead, nft_chain_ht_params);
2385 list_add_tail_rcu(&chain->list, &table->chains);
2390 static u64 chain_id;
2392 static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask,
2393 u8 policy, u32 flags,
2394 struct netlink_ext_ack *extack)
2396 const struct nlattr * const *nla = ctx->nla;
2397 struct nft_table *table = ctx->table;
2398 struct nft_base_chain *basechain;
2399 struct net *net = ctx->net;
2400 char name[NFT_NAME_MAXLEN];
2401 struct nft_rule_blob *blob;
2402 struct nft_trans *trans;
2403 struct nft_chain *chain;
2406 if (nla[NFTA_CHAIN_HOOK]) {
2407 struct nft_stats __percpu *stats = NULL;
2408 struct nft_chain_hook hook = {};
2410 if (flags & NFT_CHAIN_BINDING)
2413 err = nft_chain_parse_hook(net, NULL, nla, &hook, family, flags,
2418 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL_ACCOUNT);
2419 if (basechain == NULL) {
2420 nft_chain_release_hook(&hook);
2423 chain = &basechain->chain;
2425 if (nla[NFTA_CHAIN_COUNTERS]) {
2426 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2427 if (IS_ERR(stats)) {
2428 nft_chain_release_hook(&hook);
2430 return PTR_ERR(stats);
2432 rcu_assign_pointer(basechain->stats, stats);
2435 err = nft_basechain_init(basechain, family, &hook, flags);
2437 nft_chain_release_hook(&hook);
2443 static_branch_inc(&nft_counters_enabled);
2445 if (flags & NFT_CHAIN_BASE)
2447 if (flags & NFT_CHAIN_HW_OFFLOAD)
2450 chain = kzalloc(sizeof(*chain), GFP_KERNEL_ACCOUNT);
2454 chain->flags = flags;
2458 INIT_LIST_HEAD(&chain->rules);
2459 chain->handle = nf_tables_alloc_handle(table);
2460 chain->table = table;
2462 if (nla[NFTA_CHAIN_NAME]) {
2463 chain->name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL_ACCOUNT);
2465 if (!(flags & NFT_CHAIN_BINDING)) {
2467 goto err_destroy_chain;
2470 snprintf(name, sizeof(name), "__chain%llu", ++chain_id);
2471 chain->name = kstrdup(name, GFP_KERNEL_ACCOUNT);
2476 goto err_destroy_chain;
2479 if (nla[NFTA_CHAIN_USERDATA]) {
2480 chain->udata = nla_memdup(nla[NFTA_CHAIN_USERDATA], GFP_KERNEL_ACCOUNT);
2481 if (chain->udata == NULL) {
2483 goto err_destroy_chain;
2485 chain->udlen = nla_len(nla[NFTA_CHAIN_USERDATA]);
2488 blob = nf_tables_chain_alloc_rules(chain, 0);
2491 goto err_destroy_chain;
2494 RCU_INIT_POINTER(chain->blob_gen_0, blob);
2495 RCU_INIT_POINTER(chain->blob_gen_1, blob);
2497 err = nf_tables_register_hook(net, table, chain);
2499 goto err_destroy_chain;
2501 if (!nft_use_inc(&table->use)) {
2506 trans = nft_trans_chain_add(ctx, NFT_MSG_NEWCHAIN);
2507 if (IS_ERR(trans)) {
2508 err = PTR_ERR(trans);
2509 goto err_unregister_hook;
2512 nft_trans_chain_policy(trans) = NFT_CHAIN_POLICY_UNSET;
2513 if (nft_is_base_chain(chain))
2514 nft_trans_chain_policy(trans) = policy;
2516 err = nft_chain_add(table, chain);
2518 nft_trans_destroy(trans);
2519 goto err_unregister_hook;
2524 err_unregister_hook:
2525 nft_use_dec_restore(&table->use);
2527 nf_tables_unregister_hook(net, table, chain);
2529 nf_tables_chain_destroy(ctx);
2534 static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
2535 u32 flags, const struct nlattr *attr,
2536 struct netlink_ext_ack *extack)
2538 const struct nlattr * const *nla = ctx->nla;
2539 struct nft_base_chain *basechain = NULL;
2540 struct nft_table *table = ctx->table;
2541 struct nft_chain *chain = ctx->chain;
2542 struct nft_chain_hook hook = {};
2543 struct nft_stats *stats = NULL;
2544 struct nft_hook *h, *next;
2545 struct nf_hook_ops *ops;
2546 struct nft_trans *trans;
2547 bool unregister = false;
2550 if (chain->flags ^ flags)
2553 INIT_LIST_HEAD(&hook.list);
2555 if (nla[NFTA_CHAIN_HOOK]) {
2556 if (!nft_is_base_chain(chain)) {
2557 NL_SET_BAD_ATTR(extack, attr);
2561 basechain = nft_base_chain(chain);
2562 err = nft_chain_parse_hook(ctx->net, basechain, nla, &hook,
2563 ctx->family, flags, extack);
2567 if (basechain->type != hook.type) {
2568 nft_chain_release_hook(&hook);
2569 NL_SET_BAD_ATTR(extack, attr);
2573 if (nft_base_chain_netdev(ctx->family, basechain->ops.hooknum)) {
2574 list_for_each_entry_safe(h, next, &hook.list, list) {
2575 h->ops.pf = basechain->ops.pf;
2576 h->ops.hooknum = basechain->ops.hooknum;
2577 h->ops.priority = basechain->ops.priority;
2578 h->ops.priv = basechain->ops.priv;
2579 h->ops.hook = basechain->ops.hook;
2581 if (nft_hook_list_find(&basechain->hook_list, h)) {
2587 ops = &basechain->ops;
2588 if (ops->hooknum != hook.num ||
2589 ops->priority != hook.priority) {
2590 nft_chain_release_hook(&hook);
2591 NL_SET_BAD_ATTR(extack, attr);
2597 if (nla[NFTA_CHAIN_HANDLE] &&
2598 nla[NFTA_CHAIN_NAME]) {
2599 struct nft_chain *chain2;
2601 chain2 = nft_chain_lookup(ctx->net, table,
2602 nla[NFTA_CHAIN_NAME], genmask);
2603 if (!IS_ERR(chain2)) {
2604 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2610 if (nla[NFTA_CHAIN_COUNTERS]) {
2611 if (!nft_is_base_chain(chain)) {
2616 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2617 if (IS_ERR(stats)) {
2618 err = PTR_ERR(stats);
2623 if (!(table->flags & NFT_TABLE_F_DORMANT) &&
2624 nft_is_base_chain(chain) &&
2625 !list_empty(&hook.list)) {
2626 basechain = nft_base_chain(chain);
2627 ops = &basechain->ops;
2629 if (nft_base_chain_netdev(table->family, basechain->ops.hooknum)) {
2630 err = nft_netdev_register_hooks(ctx->net, &hook.list);
2638 trans = nft_trans_alloc(ctx, NFT_MSG_NEWCHAIN,
2639 sizeof(struct nft_trans_chain));
2643 nft_trans_chain_stats(trans) = stats;
2644 nft_trans_chain_update(trans) = true;
2646 if (nla[NFTA_CHAIN_POLICY])
2647 nft_trans_chain_policy(trans) = policy;
2649 nft_trans_chain_policy(trans) = -1;
2651 if (nla[NFTA_CHAIN_HANDLE] &&
2652 nla[NFTA_CHAIN_NAME]) {
2653 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
2654 struct nft_trans *tmp;
2658 name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL_ACCOUNT);
2663 list_for_each_entry(tmp, &nft_net->commit_list, list) {
2664 if (tmp->msg_type == NFT_MSG_NEWCHAIN &&
2665 tmp->ctx.table == table &&
2666 nft_trans_chain_update(tmp) &&
2667 nft_trans_chain_name(tmp) &&
2668 strcmp(name, nft_trans_chain_name(tmp)) == 0) {
2669 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2675 nft_trans_chain_name(trans) = name;
2678 nft_trans_basechain(trans) = basechain;
2679 INIT_LIST_HEAD(&nft_trans_chain_hooks(trans));
2680 list_splice(&hook.list, &nft_trans_chain_hooks(trans));
2681 if (nla[NFTA_CHAIN_HOOK])
2682 module_put(hook.type->owner);
2684 nft_trans_commit_list_add_tail(ctx->net, trans);
2692 if (nla[NFTA_CHAIN_HOOK]) {
2693 list_for_each_entry_safe(h, next, &hook.list, list) {
2695 nf_unregister_net_hook(ctx->net, &h->ops);
2699 module_put(hook.type->owner);
2705 static struct nft_chain *nft_chain_lookup_byid(const struct net *net,
2706 const struct nft_table *table,
2707 const struct nlattr *nla, u8 genmask)
2709 struct nftables_pernet *nft_net = nft_pernet(net);
2710 u32 id = ntohl(nla_get_be32(nla));
2711 struct nft_trans *trans;
2713 list_for_each_entry(trans, &nft_net->commit_list, list) {
2714 struct nft_chain *chain = trans->ctx.chain;
2716 if (trans->msg_type == NFT_MSG_NEWCHAIN &&
2717 chain->table == table &&
2718 id == nft_trans_chain_id(trans) &&
2719 nft_active_genmask(chain, genmask))
2722 return ERR_PTR(-ENOENT);
2725 static int nf_tables_newchain(struct sk_buff *skb, const struct nfnl_info *info,
2726 const struct nlattr * const nla[])
2728 struct nftables_pernet *nft_net = nft_pernet(info->net);
2729 struct netlink_ext_ack *extack = info->extack;
2730 u8 genmask = nft_genmask_next(info->net);
2731 u8 family = info->nfmsg->nfgen_family;
2732 struct nft_chain *chain = NULL;
2733 struct net *net = info->net;
2734 const struct nlattr *attr;
2735 struct nft_table *table;
2736 u8 policy = NF_ACCEPT;
2741 lockdep_assert_held(&nft_net->commit_mutex);
2743 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2744 NETLINK_CB(skb).portid);
2745 if (IS_ERR(table)) {
2746 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2747 return PTR_ERR(table);
2751 attr = nla[NFTA_CHAIN_NAME];
2753 if (nla[NFTA_CHAIN_HANDLE]) {
2754 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
2755 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2756 if (IS_ERR(chain)) {
2757 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_HANDLE]);
2758 return PTR_ERR(chain);
2760 attr = nla[NFTA_CHAIN_HANDLE];
2761 } else if (nla[NFTA_CHAIN_NAME]) {
2762 chain = nft_chain_lookup(net, table, attr, genmask);
2763 if (IS_ERR(chain)) {
2764 if (PTR_ERR(chain) != -ENOENT) {
2765 NL_SET_BAD_ATTR(extack, attr);
2766 return PTR_ERR(chain);
2770 } else if (!nla[NFTA_CHAIN_ID]) {
2774 if (nla[NFTA_CHAIN_POLICY]) {
2775 if (chain != NULL &&
2776 !nft_is_base_chain(chain)) {
2777 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2781 if (chain == NULL &&
2782 nla[NFTA_CHAIN_HOOK] == NULL) {
2783 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2787 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
2797 if (nla[NFTA_CHAIN_FLAGS])
2798 flags = ntohl(nla_get_be32(nla[NFTA_CHAIN_FLAGS]));
2800 flags = chain->flags;
2802 if (flags & ~NFT_CHAIN_FLAGS)
2805 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
2807 if (chain != NULL) {
2808 if (chain->flags & NFT_CHAIN_BINDING)
2811 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
2812 NL_SET_BAD_ATTR(extack, attr);
2815 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
2818 flags |= chain->flags & NFT_CHAIN_BASE;
2819 return nf_tables_updchain(&ctx, genmask, policy, flags, attr,
2823 return nf_tables_addchain(&ctx, family, genmask, policy, flags, extack);
2826 static int nft_delchain_hook(struct nft_ctx *ctx,
2827 struct nft_base_chain *basechain,
2828 struct netlink_ext_ack *extack)
2830 const struct nft_chain *chain = &basechain->chain;
2831 const struct nlattr * const *nla = ctx->nla;
2832 struct nft_chain_hook chain_hook = {};
2833 struct nft_hook *this, *hook;
2834 LIST_HEAD(chain_del_list);
2835 struct nft_trans *trans;
2838 err = nft_chain_parse_hook(ctx->net, basechain, nla, &chain_hook,
2839 ctx->family, chain->flags, extack);
2843 list_for_each_entry(this, &chain_hook.list, list) {
2844 hook = nft_hook_list_find(&basechain->hook_list, this);
2847 goto err_chain_del_hook;
2849 list_move(&hook->list, &chain_del_list);
2852 trans = nft_trans_alloc(ctx, NFT_MSG_DELCHAIN,
2853 sizeof(struct nft_trans_chain));
2856 goto err_chain_del_hook;
2859 nft_trans_basechain(trans) = basechain;
2860 nft_trans_chain_update(trans) = true;
2861 INIT_LIST_HEAD(&nft_trans_chain_hooks(trans));
2862 list_splice(&chain_del_list, &nft_trans_chain_hooks(trans));
2863 nft_chain_release_hook(&chain_hook);
2865 nft_trans_commit_list_add_tail(ctx->net, trans);
2870 list_splice(&chain_del_list, &basechain->hook_list);
2871 nft_chain_release_hook(&chain_hook);
2876 static int nf_tables_delchain(struct sk_buff *skb, const struct nfnl_info *info,
2877 const struct nlattr * const nla[])
2879 struct netlink_ext_ack *extack = info->extack;
2880 u8 genmask = nft_genmask_next(info->net);
2881 u8 family = info->nfmsg->nfgen_family;
2882 struct net *net = info->net;
2883 const struct nlattr *attr;
2884 struct nft_table *table;
2885 struct nft_chain *chain;
2886 struct nft_rule *rule;
2892 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2893 NETLINK_CB(skb).portid);
2894 if (IS_ERR(table)) {
2895 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2896 return PTR_ERR(table);
2899 if (nla[NFTA_CHAIN_HANDLE]) {
2900 attr = nla[NFTA_CHAIN_HANDLE];
2901 handle = be64_to_cpu(nla_get_be64(attr));
2902 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2904 attr = nla[NFTA_CHAIN_NAME];
2905 chain = nft_chain_lookup(net, table, attr, genmask);
2907 if (IS_ERR(chain)) {
2908 if (PTR_ERR(chain) == -ENOENT &&
2909 NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYCHAIN)
2912 NL_SET_BAD_ATTR(extack, attr);
2913 return PTR_ERR(chain);
2916 if (nft_chain_binding(chain))
2919 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
2921 if (nla[NFTA_CHAIN_HOOK]) {
2922 if (chain->flags & NFT_CHAIN_HW_OFFLOAD)
2925 if (nft_is_base_chain(chain)) {
2926 struct nft_base_chain *basechain = nft_base_chain(chain);
2928 if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
2929 return nft_delchain_hook(&ctx, basechain, extack);
2933 if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
2938 list_for_each_entry(rule, &chain->rules, list) {
2939 if (!nft_is_active_next(net, rule))
2943 err = nft_delrule(&ctx, rule);
2948 /* There are rules and elements that are still holding references to us,
2949 * we cannot do a recursive removal in this case.
2952 NL_SET_BAD_ATTR(extack, attr);
2956 return nft_delchain(&ctx);
2964 * nft_register_expr - register nf_tables expr type
2967 * Registers the expr type for use with nf_tables. Returns zero on
2968 * success or a negative errno code otherwise.
2970 int nft_register_expr(struct nft_expr_type *type)
2972 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2973 if (type->family == NFPROTO_UNSPEC)
2974 list_add_tail_rcu(&type->list, &nf_tables_expressions);
2976 list_add_rcu(&type->list, &nf_tables_expressions);
2977 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2980 EXPORT_SYMBOL_GPL(nft_register_expr);
2983 * nft_unregister_expr - unregister nf_tables expr type
2986 * Unregisters the expr typefor use with nf_tables.
2988 void nft_unregister_expr(struct nft_expr_type *type)
2990 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2991 list_del_rcu(&type->list);
2992 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2994 EXPORT_SYMBOL_GPL(nft_unregister_expr);
2996 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
2999 const struct nft_expr_type *type, *candidate = NULL;
3001 list_for_each_entry(type, &nf_tables_expressions, list) {
3002 if (!nla_strcmp(nla, type->name)) {
3003 if (!type->family && !candidate)
3005 else if (type->family == family)
3012 #ifdef CONFIG_MODULES
3013 static int nft_expr_type_request_module(struct net *net, u8 family,
3016 if (nft_request_module(net, "nft-expr-%u-%.*s", family,
3017 nla_len(nla), (char *)nla_data(nla)) == -EAGAIN)
3024 static const struct nft_expr_type *nft_expr_type_get(struct net *net,
3028 const struct nft_expr_type *type;
3031 return ERR_PTR(-EINVAL);
3033 type = __nft_expr_type_get(family, nla);
3034 if (type != NULL && try_module_get(type->owner))
3037 lockdep_nfnl_nft_mutex_not_held();
3038 #ifdef CONFIG_MODULES
3040 if (nft_expr_type_request_module(net, family, nla) == -EAGAIN)
3041 return ERR_PTR(-EAGAIN);
3043 if (nft_request_module(net, "nft-expr-%.*s",
3045 (char *)nla_data(nla)) == -EAGAIN)
3046 return ERR_PTR(-EAGAIN);
3049 return ERR_PTR(-ENOENT);
3052 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
3053 [NFTA_EXPR_NAME] = { .type = NLA_STRING,
3054 .len = NFT_MODULE_AUTOLOAD_LIMIT },
3055 [NFTA_EXPR_DATA] = { .type = NLA_NESTED },
3058 static int nf_tables_fill_expr_info(struct sk_buff *skb,
3059 const struct nft_expr *expr, bool reset)
3061 if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
3062 goto nla_put_failure;
3064 if (expr->ops->dump) {
3065 struct nlattr *data = nla_nest_start_noflag(skb,
3068 goto nla_put_failure;
3069 if (expr->ops->dump(skb, expr, reset) < 0)
3070 goto nla_put_failure;
3071 nla_nest_end(skb, data);
3080 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
3081 const struct nft_expr *expr, bool reset)
3083 struct nlattr *nest;
3085 nest = nla_nest_start_noflag(skb, attr);
3087 goto nla_put_failure;
3088 if (nf_tables_fill_expr_info(skb, expr, reset) < 0)
3089 goto nla_put_failure;
3090 nla_nest_end(skb, nest);
3097 struct nft_expr_info {
3098 const struct nft_expr_ops *ops;
3099 const struct nlattr *attr;
3100 struct nlattr *tb[NFT_EXPR_MAXATTR + 1];
3103 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
3104 const struct nlattr *nla,
3105 struct nft_expr_info *info)
3107 const struct nft_expr_type *type;
3108 const struct nft_expr_ops *ops;
3109 struct nlattr *tb[NFTA_EXPR_MAX + 1];
3112 err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
3113 nft_expr_policy, NULL);
3117 type = nft_expr_type_get(ctx->net, ctx->family, tb[NFTA_EXPR_NAME]);
3119 return PTR_ERR(type);
3121 if (tb[NFTA_EXPR_DATA]) {
3122 err = nla_parse_nested_deprecated(info->tb, type->maxattr,
3124 type->policy, NULL);
3128 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
3130 if (type->select_ops != NULL) {
3131 ops = type->select_ops(ctx,
3132 (const struct nlattr * const *)info->tb);
3135 #ifdef CONFIG_MODULES
3137 if (nft_expr_type_request_module(ctx->net,
3139 tb[NFTA_EXPR_NAME]) != -EAGAIN)
3153 module_put(type->owner);
3157 int nft_expr_inner_parse(const struct nft_ctx *ctx, const struct nlattr *nla,
3158 struct nft_expr_info *info)
3160 struct nlattr *tb[NFTA_EXPR_MAX + 1];
3161 const struct nft_expr_type *type;
3164 err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
3165 nft_expr_policy, NULL);
3169 if (!tb[NFTA_EXPR_DATA] || !tb[NFTA_EXPR_NAME])
3172 type = __nft_expr_type_get(ctx->family, tb[NFTA_EXPR_NAME]);
3176 if (!type->inner_ops)
3179 err = nla_parse_nested_deprecated(info->tb, type->maxattr,
3181 type->policy, NULL);
3186 info->ops = type->inner_ops;
3194 static int nf_tables_newexpr(const struct nft_ctx *ctx,
3195 const struct nft_expr_info *expr_info,
3196 struct nft_expr *expr)
3198 const struct nft_expr_ops *ops = expr_info->ops;
3203 err = ops->init(ctx, expr, (const struct nlattr **)expr_info->tb);
3214 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
3215 struct nft_expr *expr)
3217 const struct nft_expr_type *type = expr->ops->type;
3219 if (expr->ops->destroy)
3220 expr->ops->destroy(ctx, expr);
3221 module_put(type->owner);
3224 static struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
3225 const struct nlattr *nla)
3227 struct nft_expr_info expr_info;
3228 struct nft_expr *expr;
3229 struct module *owner;
3232 err = nf_tables_expr_parse(ctx, nla, &expr_info);
3234 goto err_expr_parse;
3237 if (!(expr_info.ops->type->flags & NFT_EXPR_STATEFUL))
3238 goto err_expr_stateful;
3241 expr = kzalloc(expr_info.ops->size, GFP_KERNEL_ACCOUNT);
3243 goto err_expr_stateful;
3245 err = nf_tables_newexpr(ctx, &expr_info, expr);
3253 owner = expr_info.ops->type->owner;
3254 if (expr_info.ops->type->release_ops)
3255 expr_info.ops->type->release_ops(expr_info.ops);
3259 return ERR_PTR(err);
3262 int nft_expr_clone(struct nft_expr *dst, struct nft_expr *src)
3266 if (src->ops->clone) {
3267 dst->ops = src->ops;
3268 err = src->ops->clone(dst, src);
3272 memcpy(dst, src, src->ops->size);
3275 __module_get(src->ops->type->owner);
3280 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
3282 nf_tables_expr_destroy(ctx, expr);
3290 static struct nft_rule *__nft_rule_lookup(const struct nft_chain *chain,
3293 struct nft_rule *rule;
3295 // FIXME: this sucks
3296 list_for_each_entry_rcu(rule, &chain->rules, list) {
3297 if (handle == rule->handle)
3301 return ERR_PTR(-ENOENT);
3304 static struct nft_rule *nft_rule_lookup(const struct nft_chain *chain,
3305 const struct nlattr *nla)
3308 return ERR_PTR(-EINVAL);
3310 return __nft_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
3313 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
3314 [NFTA_RULE_TABLE] = { .type = NLA_STRING,
3315 .len = NFT_TABLE_MAXNAMELEN - 1 },
3316 [NFTA_RULE_CHAIN] = { .type = NLA_STRING,
3317 .len = NFT_CHAIN_MAXNAMELEN - 1 },
3318 [NFTA_RULE_HANDLE] = { .type = NLA_U64 },
3319 [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
3320 [NFTA_RULE_COMPAT] = { .type = NLA_NESTED },
3321 [NFTA_RULE_POSITION] = { .type = NLA_U64 },
3322 [NFTA_RULE_USERDATA] = { .type = NLA_BINARY,
3323 .len = NFT_USERDATA_MAXLEN },
3324 [NFTA_RULE_ID] = { .type = NLA_U32 },
3325 [NFTA_RULE_POSITION_ID] = { .type = NLA_U32 },
3326 [NFTA_RULE_CHAIN_ID] = { .type = NLA_U32 },
3329 static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
3330 u32 portid, u32 seq, int event,
3331 u32 flags, int family,
3332 const struct nft_table *table,
3333 const struct nft_chain *chain,
3334 const struct nft_rule *rule, u64 handle,
3337 struct nlmsghdr *nlh;
3338 const struct nft_expr *expr, *next;
3339 struct nlattr *list;
3340 u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
3342 nlh = nfnl_msg_put(skb, portid, seq, type, flags, family, NFNETLINK_V0,
3345 goto nla_put_failure;
3347 if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
3348 goto nla_put_failure;
3349 if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
3350 goto nla_put_failure;
3351 if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
3353 goto nla_put_failure;
3355 if (event != NFT_MSG_DELRULE && handle) {
3356 if (nla_put_be64(skb, NFTA_RULE_POSITION, cpu_to_be64(handle),
3358 goto nla_put_failure;
3361 if (chain->flags & NFT_CHAIN_HW_OFFLOAD)
3362 nft_flow_rule_stats(chain, rule);
3364 list = nla_nest_start_noflag(skb, NFTA_RULE_EXPRESSIONS);
3366 goto nla_put_failure;
3367 nft_rule_for_each_expr(expr, next, rule) {
3368 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr, reset) < 0)
3369 goto nla_put_failure;
3371 nla_nest_end(skb, list);
3374 struct nft_userdata *udata = nft_userdata(rule);
3375 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
3377 goto nla_put_failure;
3380 nlmsg_end(skb, nlh);
3384 nlmsg_trim(skb, nlh);
3388 static void nf_tables_rule_notify(const struct nft_ctx *ctx,
3389 const struct nft_rule *rule, int event)
3391 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
3392 const struct nft_rule *prule;
3393 struct sk_buff *skb;
3399 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
3402 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3406 if (event == NFT_MSG_NEWRULE &&
3407 !list_is_first(&rule->list, &ctx->chain->rules) &&
3408 !list_is_last(&rule->list, &ctx->chain->rules)) {
3409 prule = list_prev_entry(rule, list);
3410 handle = prule->handle;
3412 if (ctx->flags & (NLM_F_APPEND | NLM_F_REPLACE))
3413 flags |= NLM_F_APPEND;
3414 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
3415 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
3417 err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
3418 event, flags, ctx->family, ctx->table,
3419 ctx->chain, rule, handle, false);
3425 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
3428 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
3431 static void audit_log_rule_reset(const struct nft_table *table,
3432 unsigned int base_seq,
3433 unsigned int nentries)
3435 char *buf = kasprintf(GFP_ATOMIC, "%s:%u",
3436 table->name, base_seq);
3438 audit_log_nfcfg(buf, table->family, nentries,
3439 AUDIT_NFT_OP_RULE_RESET, GFP_ATOMIC);
3443 struct nft_rule_dump_ctx {
3448 static int __nf_tables_dump_rules(struct sk_buff *skb,
3450 struct netlink_callback *cb,
3451 const struct nft_table *table,
3452 const struct nft_chain *chain,
3455 struct net *net = sock_net(skb->sk);
3456 const struct nft_rule *rule, *prule;
3457 unsigned int s_idx = cb->args[0];
3458 unsigned int entries = 0;
3463 list_for_each_entry_rcu(rule, &chain->rules, list) {
3464 if (!nft_is_active(net, rule))
3469 memset(&cb->args[1], 0,
3470 sizeof(cb->args) - sizeof(cb->args[0]));
3473 handle = prule->handle;
3477 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
3480 NLM_F_MULTI | NLM_F_APPEND,
3482 table, chain, rule, handle, reset) < 0) {
3487 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3494 if (reset && entries)
3495 audit_log_rule_reset(table, cb->seq, entries);
3500 static int nf_tables_dump_rules(struct sk_buff *skb,
3501 struct netlink_callback *cb)
3503 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
3504 const struct nft_rule_dump_ctx *ctx = cb->data;
3505 struct nft_table *table;
3506 const struct nft_chain *chain;
3507 unsigned int idx = 0;
3508 struct net *net = sock_net(skb->sk);
3509 int family = nfmsg->nfgen_family;
3510 struct nftables_pernet *nft_net;
3513 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETRULE_RESET)
3517 nft_net = nft_pernet(net);
3518 cb->seq = READ_ONCE(nft_net->base_seq);
3520 list_for_each_entry_rcu(table, &nft_net->tables, list) {
3521 if (family != NFPROTO_UNSPEC && family != table->family)
3524 if (ctx && ctx->table && strcmp(ctx->table, table->name) != 0)
3527 if (ctx && ctx->table && ctx->chain) {
3528 struct rhlist_head *list, *tmp;
3530 list = rhltable_lookup(&table->chains_ht, ctx->chain,
3531 nft_chain_ht_params);
3535 rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
3536 if (!nft_is_active(net, chain))
3538 __nf_tables_dump_rules(skb, &idx,
3539 cb, table, chain, reset);
3545 list_for_each_entry_rcu(chain, &table->chains, list) {
3546 if (__nf_tables_dump_rules(skb, &idx,
3547 cb, table, chain, reset))
3551 if (ctx && ctx->table)
3561 static int nf_tables_dump_rules_start(struct netlink_callback *cb)
3563 const struct nlattr * const *nla = cb->data;
3564 struct nft_rule_dump_ctx *ctx = NULL;
3566 if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) {
3567 ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
3571 if (nla[NFTA_RULE_TABLE]) {
3572 ctx->table = nla_strdup(nla[NFTA_RULE_TABLE],
3579 if (nla[NFTA_RULE_CHAIN]) {
3580 ctx->chain = nla_strdup(nla[NFTA_RULE_CHAIN],
3594 static int nf_tables_dump_rules_done(struct netlink_callback *cb)
3596 struct nft_rule_dump_ctx *ctx = cb->data;
3606 /* called with rcu_read_lock held */
3607 static int nf_tables_getrule(struct sk_buff *skb, const struct nfnl_info *info,
3608 const struct nlattr * const nla[])
3610 struct netlink_ext_ack *extack = info->extack;
3611 u8 genmask = nft_genmask_cur(info->net);
3612 u8 family = info->nfmsg->nfgen_family;
3613 const struct nft_chain *chain;
3614 const struct nft_rule *rule;
3615 struct net *net = info->net;
3616 struct nft_table *table;
3617 struct sk_buff *skb2;
3621 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
3622 struct netlink_dump_control c = {
3623 .start= nf_tables_dump_rules_start,
3624 .dump = nf_tables_dump_rules,
3625 .done = nf_tables_dump_rules_done,
3626 .module = THIS_MODULE,
3627 .data = (void *)nla,
3630 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
3633 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask, 0);
3634 if (IS_ERR(table)) {
3635 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3636 return PTR_ERR(table);
3639 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask);
3640 if (IS_ERR(chain)) {
3641 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3642 return PTR_ERR(chain);
3645 rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
3647 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3648 return PTR_ERR(rule);
3651 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
3655 if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_GETRULE_RESET)
3658 err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
3659 info->nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
3660 family, table, chain, rule, 0, reset);
3662 goto err_fill_rule_info;
3665 audit_log_rule_reset(table, nft_pernet(net)->base_seq, 1);
3667 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
3674 void nf_tables_rule_destroy(const struct nft_ctx *ctx, struct nft_rule *rule)
3676 struct nft_expr *expr, *next;
3679 * Careful: some expressions might not be initialized in case this
3680 * is called on error from nf_tables_newrule().
3682 expr = nft_expr_first(rule);
3683 while (nft_expr_more(rule, expr)) {
3684 next = nft_expr_next(expr);
3685 nf_tables_expr_destroy(ctx, expr);
3691 static void nf_tables_rule_release(const struct nft_ctx *ctx, struct nft_rule *rule)
3693 nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_RELEASE);
3694 nf_tables_rule_destroy(ctx, rule);
3697 int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain)
3699 struct nft_expr *expr, *last;
3700 const struct nft_data *data;
3701 struct nft_rule *rule;
3704 if (ctx->level == NFT_JUMP_STACK_SIZE)
3707 list_for_each_entry(rule, &chain->rules, list) {
3708 if (fatal_signal_pending(current))
3711 if (!nft_is_active_next(ctx->net, rule))
3714 nft_rule_for_each_expr(expr, last, rule) {
3715 if (!expr->ops->validate)
3718 err = expr->ops->validate(ctx, expr, &data);
3726 EXPORT_SYMBOL_GPL(nft_chain_validate);
3728 static int nft_table_validate(struct net *net, const struct nft_table *table)
3730 struct nft_chain *chain;
3731 struct nft_ctx ctx = {
3733 .family = table->family,
3737 list_for_each_entry(chain, &table->chains, list) {
3738 if (!nft_is_base_chain(chain))
3742 err = nft_chain_validate(&ctx, chain);
3752 int nft_setelem_validate(const struct nft_ctx *ctx, struct nft_set *set,
3753 const struct nft_set_iter *iter,
3754 struct nft_set_elem *elem)
3756 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
3757 struct nft_ctx *pctx = (struct nft_ctx *)ctx;
3758 const struct nft_data *data;
3761 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
3762 *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
3765 data = nft_set_ext_data(ext);
3766 switch (data->verdict.code) {
3770 err = nft_chain_validate(ctx, data->verdict.chain);
3782 int nft_set_catchall_validate(const struct nft_ctx *ctx, struct nft_set *set)
3784 u8 genmask = nft_genmask_next(ctx->net);
3785 struct nft_set_elem_catchall *catchall;
3786 struct nft_set_elem elem;
3787 struct nft_set_ext *ext;
3790 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
3791 ext = nft_set_elem_ext(set, catchall->elem);
3792 if (!nft_set_elem_active(ext, genmask))
3795 elem.priv = catchall->elem;
3796 ret = nft_setelem_validate(ctx, set, NULL, &elem);
3804 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3805 const struct nft_chain *chain,
3806 const struct nlattr *nla);
3808 #define NFT_RULE_MAXEXPRS 128
3810 static int nf_tables_newrule(struct sk_buff *skb, const struct nfnl_info *info,
3811 const struct nlattr * const nla[])
3813 struct nftables_pernet *nft_net = nft_pernet(info->net);
3814 struct netlink_ext_ack *extack = info->extack;
3815 unsigned int size, i, n, ulen = 0, usize = 0;
3816 u8 genmask = nft_genmask_next(info->net);
3817 struct nft_rule *rule, *old_rule = NULL;
3818 struct nft_expr_info *expr_info = NULL;
3819 u8 family = info->nfmsg->nfgen_family;
3820 struct nft_flow_rule *flow = NULL;
3821 struct net *net = info->net;
3822 struct nft_userdata *udata;
3823 struct nft_table *table;
3824 struct nft_chain *chain;
3825 struct nft_trans *trans;
3826 u64 handle, pos_handle;
3827 struct nft_expr *expr;
3832 lockdep_assert_held(&nft_net->commit_mutex);
3834 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
3835 NETLINK_CB(skb).portid);
3836 if (IS_ERR(table)) {
3837 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3838 return PTR_ERR(table);
3841 if (nla[NFTA_RULE_CHAIN]) {
3842 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3844 if (IS_ERR(chain)) {
3845 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3846 return PTR_ERR(chain);
3849 } else if (nla[NFTA_RULE_CHAIN_ID]) {
3850 chain = nft_chain_lookup_byid(net, table, nla[NFTA_RULE_CHAIN_ID],
3852 if (IS_ERR(chain)) {
3853 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN_ID]);
3854 return PTR_ERR(chain);
3860 if (nft_chain_is_bound(chain))
3863 if (nla[NFTA_RULE_HANDLE]) {
3864 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
3865 rule = __nft_rule_lookup(chain, handle);
3867 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3868 return PTR_ERR(rule);
3871 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
3872 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3875 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
3880 if (!(info->nlh->nlmsg_flags & NLM_F_CREATE) ||
3881 info->nlh->nlmsg_flags & NLM_F_REPLACE)
3883 handle = nf_tables_alloc_handle(table);
3885 if (nla[NFTA_RULE_POSITION]) {
3886 pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
3887 old_rule = __nft_rule_lookup(chain, pos_handle);
3888 if (IS_ERR(old_rule)) {
3889 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION]);
3890 return PTR_ERR(old_rule);
3892 } else if (nla[NFTA_RULE_POSITION_ID]) {
3893 old_rule = nft_rule_lookup_byid(net, chain, nla[NFTA_RULE_POSITION_ID]);
3894 if (IS_ERR(old_rule)) {
3895 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION_ID]);
3896 return PTR_ERR(old_rule);
3901 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
3905 if (nla[NFTA_RULE_EXPRESSIONS]) {
3906 expr_info = kvmalloc_array(NFT_RULE_MAXEXPRS,
3907 sizeof(struct nft_expr_info),
3912 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
3914 if (nla_type(tmp) != NFTA_LIST_ELEM)
3915 goto err_release_expr;
3916 if (n == NFT_RULE_MAXEXPRS)
3917 goto err_release_expr;
3918 err = nf_tables_expr_parse(&ctx, tmp, &expr_info[n]);
3920 NL_SET_BAD_ATTR(extack, tmp);
3921 goto err_release_expr;
3923 size += expr_info[n].ops->size;
3927 /* Check for overflow of dlen field */
3929 if (size >= 1 << 12)
3930 goto err_release_expr;
3932 if (nla[NFTA_RULE_USERDATA]) {
3933 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
3935 usize = sizeof(struct nft_userdata) + ulen;
3939 rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL_ACCOUNT);
3941 goto err_release_expr;
3943 nft_activate_next(net, rule);
3945 rule->handle = handle;
3947 rule->udata = ulen ? 1 : 0;
3950 udata = nft_userdata(rule);
3951 udata->len = ulen - 1;
3952 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
3955 expr = nft_expr_first(rule);
3956 for (i = 0; i < n; i++) {
3957 err = nf_tables_newexpr(&ctx, &expr_info[i], expr);
3959 NL_SET_BAD_ATTR(extack, expr_info[i].attr);
3960 goto err_release_rule;
3963 if (expr_info[i].ops->validate)
3964 nft_validate_state_update(table, NFT_VALIDATE_NEED);
3966 expr_info[i].ops = NULL;
3967 expr = nft_expr_next(expr);
3970 if (chain->flags & NFT_CHAIN_HW_OFFLOAD) {
3971 flow = nft_flow_rule_create(net, rule);
3973 err = PTR_ERR(flow);
3974 goto err_release_rule;
3978 if (!nft_use_inc(&chain->use)) {
3980 goto err_release_rule;
3983 if (info->nlh->nlmsg_flags & NLM_F_REPLACE) {
3984 if (nft_chain_binding(chain)) {
3986 goto err_destroy_flow_rule;
3989 err = nft_delrule(&ctx, old_rule);
3991 goto err_destroy_flow_rule;
3993 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
3994 if (trans == NULL) {
3996 goto err_destroy_flow_rule;
3998 list_add_tail_rcu(&rule->list, &old_rule->list);
4000 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
4003 goto err_destroy_flow_rule;
4006 if (info->nlh->nlmsg_flags & NLM_F_APPEND) {
4008 list_add_rcu(&rule->list, &old_rule->list);
4010 list_add_tail_rcu(&rule->list, &chain->rules);
4013 list_add_tail_rcu(&rule->list, &old_rule->list);
4015 list_add_rcu(&rule->list, &chain->rules);
4021 nft_trans_flow_rule(trans) = flow;
4023 if (table->validate_state == NFT_VALIDATE_DO)
4024 return nft_table_validate(net, table);
4028 err_destroy_flow_rule:
4029 nft_use_dec_restore(&chain->use);
4031 nft_flow_rule_destroy(flow);
4033 nft_rule_expr_deactivate(&ctx, rule, NFT_TRANS_PREPARE_ERROR);
4034 nf_tables_rule_destroy(&ctx, rule);
4036 for (i = 0; i < n; i++) {
4037 if (expr_info[i].ops) {
4038 module_put(expr_info[i].ops->type->owner);
4039 if (expr_info[i].ops->type->release_ops)
4040 expr_info[i].ops->type->release_ops(expr_info[i].ops);
4048 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
4049 const struct nft_chain *chain,
4050 const struct nlattr *nla)
4052 struct nftables_pernet *nft_net = nft_pernet(net);
4053 u32 id = ntohl(nla_get_be32(nla));
4054 struct nft_trans *trans;
4056 list_for_each_entry(trans, &nft_net->commit_list, list) {
4057 if (trans->msg_type == NFT_MSG_NEWRULE &&
4058 trans->ctx.chain == chain &&
4059 id == nft_trans_rule_id(trans))
4060 return nft_trans_rule(trans);
4062 return ERR_PTR(-ENOENT);
4065 static int nf_tables_delrule(struct sk_buff *skb, const struct nfnl_info *info,
4066 const struct nlattr * const nla[])
4068 struct netlink_ext_ack *extack = info->extack;
4069 u8 genmask = nft_genmask_next(info->net);
4070 u8 family = info->nfmsg->nfgen_family;
4071 struct nft_chain *chain = NULL;
4072 struct net *net = info->net;
4073 struct nft_table *table;
4074 struct nft_rule *rule;
4078 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
4079 NETLINK_CB(skb).portid);
4080 if (IS_ERR(table)) {
4081 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
4082 return PTR_ERR(table);
4085 if (nla[NFTA_RULE_CHAIN]) {
4086 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
4088 if (IS_ERR(chain)) {
4089 if (PTR_ERR(chain) == -ENOENT &&
4090 NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYRULE)
4093 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
4094 return PTR_ERR(chain);
4096 if (nft_chain_binding(chain))
4100 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
4103 if (nla[NFTA_RULE_HANDLE]) {
4104 rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
4106 if (PTR_ERR(rule) == -ENOENT &&
4107 NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYRULE)
4110 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
4111 return PTR_ERR(rule);
4114 err = nft_delrule(&ctx, rule);
4115 } else if (nla[NFTA_RULE_ID]) {
4116 rule = nft_rule_lookup_byid(net, chain, nla[NFTA_RULE_ID]);
4118 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_ID]);
4119 return PTR_ERR(rule);
4122 err = nft_delrule(&ctx, rule);
4124 err = nft_delrule_by_chain(&ctx);
4127 list_for_each_entry(chain, &table->chains, list) {
4128 if (!nft_is_active_next(net, chain))
4130 if (nft_chain_binding(chain))
4134 err = nft_delrule_by_chain(&ctx);
4146 static const struct nft_set_type *nft_set_types[] = {
4147 &nft_set_hash_fast_type,
4149 &nft_set_rhash_type,
4150 &nft_set_bitmap_type,
4151 &nft_set_rbtree_type,
4152 #if defined(CONFIG_X86_64) && !defined(CONFIG_UML)
4153 &nft_set_pipapo_avx2_type,
4155 &nft_set_pipapo_type,
4158 #define NFT_SET_FEATURES (NFT_SET_INTERVAL | NFT_SET_MAP | \
4159 NFT_SET_TIMEOUT | NFT_SET_OBJECT | \
4162 static bool nft_set_ops_candidate(const struct nft_set_type *type, u32 flags)
4164 return (flags & type->features) == (flags & NFT_SET_FEATURES);
4168 * Select a set implementation based on the data characteristics and the
4169 * given policy. The total memory use might not be known if no size is
4170 * given, in that case the amount of memory per element is used.
4172 static const struct nft_set_ops *
4173 nft_select_set_ops(const struct nft_ctx *ctx,
4174 const struct nlattr * const nla[],
4175 const struct nft_set_desc *desc)
4177 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
4178 const struct nft_set_ops *ops, *bops;
4179 struct nft_set_estimate est, best;
4180 const struct nft_set_type *type;
4184 lockdep_assert_held(&nft_net->commit_mutex);
4185 lockdep_nfnl_nft_mutex_not_held();
4187 if (nla[NFTA_SET_FLAGS] != NULL)
4188 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
4195 for (i = 0; i < ARRAY_SIZE(nft_set_types); i++) {
4196 type = nft_set_types[i];
4199 if (!nft_set_ops_candidate(type, flags))
4201 if (!ops->estimate(desc, flags, &est))
4204 switch (desc->policy) {
4205 case NFT_SET_POL_PERFORMANCE:
4206 if (est.lookup < best.lookup)
4208 if (est.lookup == best.lookup &&
4209 est.space < best.space)
4212 case NFT_SET_POL_MEMORY:
4214 if (est.space < best.space)
4216 if (est.space == best.space &&
4217 est.lookup < best.lookup)
4219 } else if (est.size < best.size || !bops) {
4234 return ERR_PTR(-EOPNOTSUPP);
4237 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
4238 [NFTA_SET_TABLE] = { .type = NLA_STRING,
4239 .len = NFT_TABLE_MAXNAMELEN - 1 },
4240 [NFTA_SET_NAME] = { .type = NLA_STRING,
4241 .len = NFT_SET_MAXNAMELEN - 1 },
4242 [NFTA_SET_FLAGS] = { .type = NLA_U32 },
4243 [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 },
4244 [NFTA_SET_KEY_LEN] = { .type = NLA_U32 },
4245 [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 },
4246 [NFTA_SET_DATA_LEN] = { .type = NLA_U32 },
4247 [NFTA_SET_POLICY] = { .type = NLA_U32 },
4248 [NFTA_SET_DESC] = { .type = NLA_NESTED },
4249 [NFTA_SET_ID] = { .type = NLA_U32 },
4250 [NFTA_SET_TIMEOUT] = { .type = NLA_U64 },
4251 [NFTA_SET_GC_INTERVAL] = { .type = NLA_U32 },
4252 [NFTA_SET_USERDATA] = { .type = NLA_BINARY,
4253 .len = NFT_USERDATA_MAXLEN },
4254 [NFTA_SET_OBJ_TYPE] = { .type = NLA_U32 },
4255 [NFTA_SET_HANDLE] = { .type = NLA_U64 },
4256 [NFTA_SET_EXPR] = { .type = NLA_NESTED },
4257 [NFTA_SET_EXPRESSIONS] = { .type = NLA_NESTED },
4260 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
4261 [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 },
4262 [NFTA_SET_DESC_CONCAT] = { .type = NLA_NESTED },
4265 static struct nft_set *nft_set_lookup(const struct nft_table *table,
4266 const struct nlattr *nla, u8 genmask)
4268 struct nft_set *set;
4271 return ERR_PTR(-EINVAL);
4273 list_for_each_entry_rcu(set, &table->sets, list) {
4274 if (!nla_strcmp(nla, set->name) &&
4275 nft_active_genmask(set, genmask))
4278 return ERR_PTR(-ENOENT);
4281 static struct nft_set *nft_set_lookup_byhandle(const struct nft_table *table,
4282 const struct nlattr *nla,
4285 struct nft_set *set;
4287 list_for_each_entry(set, &table->sets, list) {
4288 if (be64_to_cpu(nla_get_be64(nla)) == set->handle &&
4289 nft_active_genmask(set, genmask))
4292 return ERR_PTR(-ENOENT);
4295 static struct nft_set *nft_set_lookup_byid(const struct net *net,
4296 const struct nft_table *table,
4297 const struct nlattr *nla, u8 genmask)
4299 struct nftables_pernet *nft_net = nft_pernet(net);
4300 u32 id = ntohl(nla_get_be32(nla));
4301 struct nft_trans *trans;
4303 list_for_each_entry(trans, &nft_net->commit_list, list) {
4304 if (trans->msg_type == NFT_MSG_NEWSET) {
4305 struct nft_set *set = nft_trans_set(trans);
4307 if (id == nft_trans_set_id(trans) &&
4308 set->table == table &&
4309 nft_active_genmask(set, genmask))
4313 return ERR_PTR(-ENOENT);
4316 struct nft_set *nft_set_lookup_global(const struct net *net,
4317 const struct nft_table *table,
4318 const struct nlattr *nla_set_name,
4319 const struct nlattr *nla_set_id,
4322 struct nft_set *set;
4324 set = nft_set_lookup(table, nla_set_name, genmask);
4329 set = nft_set_lookup_byid(net, table, nla_set_id, genmask);
4333 EXPORT_SYMBOL_GPL(nft_set_lookup_global);
4335 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
4338 const struct nft_set *i;
4340 unsigned long *inuse;
4341 unsigned int n = 0, min = 0;
4343 p = strchr(name, '%');
4345 if (p[1] != 'd' || strchr(p + 2, '%'))
4348 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
4352 list_for_each_entry(i, &ctx->table->sets, list) {
4355 if (!nft_is_active_next(ctx->net, i))
4357 if (!sscanf(i->name, name, &tmp))
4359 if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
4362 set_bit(tmp - min, inuse);
4365 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
4366 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
4367 min += BITS_PER_BYTE * PAGE_SIZE;
4368 memset(inuse, 0, PAGE_SIZE);
4371 free_page((unsigned long)inuse);
4374 set->name = kasprintf(GFP_KERNEL_ACCOUNT, name, min + n);
4378 list_for_each_entry(i, &ctx->table->sets, list) {
4379 if (!nft_is_active_next(ctx->net, i))
4381 if (!strcmp(set->name, i->name)) {
4390 int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result)
4392 u64 ms = be64_to_cpu(nla_get_be64(nla));
4393 u64 max = (u64)(~((u64)0));
4395 max = div_u64(max, NSEC_PER_MSEC);
4399 ms *= NSEC_PER_MSEC;
4400 *result = nsecs_to_jiffies64(ms);
4404 __be64 nf_jiffies64_to_msecs(u64 input)
4406 return cpu_to_be64(jiffies64_to_msecs(input));
4409 static int nf_tables_fill_set_concat(struct sk_buff *skb,
4410 const struct nft_set *set)
4412 struct nlattr *concat, *field;
4415 concat = nla_nest_start_noflag(skb, NFTA_SET_DESC_CONCAT);
4419 for (i = 0; i < set->field_count; i++) {
4420 field = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
4424 if (nla_put_be32(skb, NFTA_SET_FIELD_LEN,
4425 htonl(set->field_len[i])))
4428 nla_nest_end(skb, field);
4431 nla_nest_end(skb, concat);
4436 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
4437 const struct nft_set *set, u16 event, u16 flags)
4439 u64 timeout = READ_ONCE(set->timeout);
4440 u32 gc_int = READ_ONCE(set->gc_int);
4441 u32 portid = ctx->portid;
4442 struct nlmsghdr *nlh;
4443 struct nlattr *nest;
4447 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
4448 nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
4449 NFNETLINK_V0, nft_base_seq(ctx->net));
4451 goto nla_put_failure;
4453 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
4454 goto nla_put_failure;
4455 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
4456 goto nla_put_failure;
4457 if (nla_put_be64(skb, NFTA_SET_HANDLE, cpu_to_be64(set->handle),
4459 goto nla_put_failure;
4461 if (event == NFT_MSG_DELSET) {
4462 nlmsg_end(skb, nlh);
4466 if (set->flags != 0)
4467 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
4468 goto nla_put_failure;
4470 if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
4471 goto nla_put_failure;
4472 if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
4473 goto nla_put_failure;
4474 if (set->flags & NFT_SET_MAP) {
4475 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
4476 goto nla_put_failure;
4477 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
4478 goto nla_put_failure;
4480 if (set->flags & NFT_SET_OBJECT &&
4481 nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
4482 goto nla_put_failure;
4485 nla_put_be64(skb, NFTA_SET_TIMEOUT,
4486 nf_jiffies64_to_msecs(timeout),
4488 goto nla_put_failure;
4490 nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(gc_int)))
4491 goto nla_put_failure;
4493 if (set->policy != NFT_SET_POL_PERFORMANCE) {
4494 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
4495 goto nla_put_failure;
4499 nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
4500 goto nla_put_failure;
4502 nest = nla_nest_start_noflag(skb, NFTA_SET_DESC);
4504 goto nla_put_failure;
4506 nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
4507 goto nla_put_failure;
4509 if (set->field_count > 1 &&
4510 nf_tables_fill_set_concat(skb, set))
4511 goto nla_put_failure;
4513 nla_nest_end(skb, nest);
4515 if (set->num_exprs == 1) {
4516 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPR);
4517 if (nf_tables_fill_expr_info(skb, set->exprs[0], false) < 0)
4518 goto nla_put_failure;
4520 nla_nest_end(skb, nest);
4521 } else if (set->num_exprs > 1) {
4522 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPRESSIONS);
4524 goto nla_put_failure;
4526 for (i = 0; i < set->num_exprs; i++) {
4527 if (nft_expr_dump(skb, NFTA_LIST_ELEM,
4528 set->exprs[i], false) < 0)
4529 goto nla_put_failure;
4531 nla_nest_end(skb, nest);
4534 nlmsg_end(skb, nlh);
4538 nlmsg_trim(skb, nlh);
4542 static void nf_tables_set_notify(const struct nft_ctx *ctx,
4543 const struct nft_set *set, int event,
4546 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
4547 u32 portid = ctx->portid;
4548 struct sk_buff *skb;
4553 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
4556 skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
4560 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
4561 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
4563 err = nf_tables_fill_set(skb, ctx, set, event, flags);
4569 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
4572 nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
4575 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
4577 const struct nft_set *set;
4578 unsigned int idx, s_idx = cb->args[0];
4579 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
4580 struct net *net = sock_net(skb->sk);
4581 struct nft_ctx *ctx = cb->data, ctx_set;
4582 struct nftables_pernet *nft_net;
4588 nft_net = nft_pernet(net);
4589 cb->seq = READ_ONCE(nft_net->base_seq);
4591 list_for_each_entry_rcu(table, &nft_net->tables, list) {
4592 if (ctx->family != NFPROTO_UNSPEC &&
4593 ctx->family != table->family)
4596 if (ctx->table && ctx->table != table)
4600 if (cur_table != table)
4606 list_for_each_entry_rcu(set, &table->sets, list) {
4609 if (!nft_is_active(net, set))
4613 ctx_set.table = table;
4614 ctx_set.family = table->family;
4616 if (nf_tables_fill_set(skb, &ctx_set, set,
4620 cb->args[2] = (unsigned long) table;
4623 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4636 static int nf_tables_dump_sets_start(struct netlink_callback *cb)
4638 struct nft_ctx *ctx_dump = NULL;
4640 ctx_dump = kmemdup(cb->data, sizeof(*ctx_dump), GFP_ATOMIC);
4641 if (ctx_dump == NULL)
4644 cb->data = ctx_dump;
4648 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
4654 /* called with rcu_read_lock held */
4655 static int nf_tables_getset(struct sk_buff *skb, const struct nfnl_info *info,
4656 const struct nlattr * const nla[])
4658 struct netlink_ext_ack *extack = info->extack;
4659 u8 genmask = nft_genmask_cur(info->net);
4660 u8 family = info->nfmsg->nfgen_family;
4661 struct nft_table *table = NULL;
4662 struct net *net = info->net;
4663 const struct nft_set *set;
4664 struct sk_buff *skb2;
4668 if (nla[NFTA_SET_TABLE]) {
4669 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
4671 if (IS_ERR(table)) {
4672 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4673 return PTR_ERR(table);
4677 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4679 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
4680 struct netlink_dump_control c = {
4681 .start = nf_tables_dump_sets_start,
4682 .dump = nf_tables_dump_sets,
4683 .done = nf_tables_dump_sets_done,
4685 .module = THIS_MODULE,
4688 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
4691 /* Only accept unspec with dump */
4692 if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
4693 return -EAFNOSUPPORT;
4694 if (!nla[NFTA_SET_TABLE])
4697 set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
4699 return PTR_ERR(set);
4701 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
4705 err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
4707 goto err_fill_set_info;
4709 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
4716 static const struct nla_policy nft_concat_policy[NFTA_SET_FIELD_MAX + 1] = {
4717 [NFTA_SET_FIELD_LEN] = { .type = NLA_U32 },
4720 static int nft_set_desc_concat_parse(const struct nlattr *attr,
4721 struct nft_set_desc *desc)
4723 struct nlattr *tb[NFTA_SET_FIELD_MAX + 1];
4727 if (desc->field_count >= ARRAY_SIZE(desc->field_len))
4730 err = nla_parse_nested_deprecated(tb, NFTA_SET_FIELD_MAX, attr,
4731 nft_concat_policy, NULL);
4735 if (!tb[NFTA_SET_FIELD_LEN])
4738 len = ntohl(nla_get_be32(tb[NFTA_SET_FIELD_LEN]));
4739 if (!len || len > U8_MAX)
4742 desc->field_len[desc->field_count++] = len;
4747 static int nft_set_desc_concat(struct nft_set_desc *desc,
4748 const struct nlattr *nla)
4750 struct nlattr *attr;
4754 nla_for_each_nested(attr, nla, rem) {
4755 if (nla_type(attr) != NFTA_LIST_ELEM)
4758 err = nft_set_desc_concat_parse(attr, desc);
4763 for (i = 0; i < desc->field_count; i++)
4764 num_regs += DIV_ROUND_UP(desc->field_len[i], sizeof(u32));
4766 if (num_regs > NFT_REG32_COUNT)
4772 static int nf_tables_set_desc_parse(struct nft_set_desc *desc,
4773 const struct nlattr *nla)
4775 struct nlattr *da[NFTA_SET_DESC_MAX + 1];
4778 err = nla_parse_nested_deprecated(da, NFTA_SET_DESC_MAX, nla,
4779 nft_set_desc_policy, NULL);
4783 if (da[NFTA_SET_DESC_SIZE] != NULL)
4784 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
4785 if (da[NFTA_SET_DESC_CONCAT])
4786 err = nft_set_desc_concat(desc, da[NFTA_SET_DESC_CONCAT]);
4791 static int nft_set_expr_alloc(struct nft_ctx *ctx, struct nft_set *set,
4792 const struct nlattr * const *nla,
4793 struct nft_expr **exprs, int *num_exprs,
4796 struct nft_expr *expr;
4799 if (nla[NFTA_SET_EXPR]) {
4800 expr = nft_set_elem_expr_alloc(ctx, set, nla[NFTA_SET_EXPR]);
4802 err = PTR_ERR(expr);
4803 goto err_set_expr_alloc;
4807 } else if (nla[NFTA_SET_EXPRESSIONS]) {
4811 if (!(flags & NFT_SET_EXPR)) {
4813 goto err_set_expr_alloc;
4816 nla_for_each_nested(tmp, nla[NFTA_SET_EXPRESSIONS], left) {
4817 if (i == NFT_SET_EXPR_MAX) {
4819 goto err_set_expr_alloc;
4821 if (nla_type(tmp) != NFTA_LIST_ELEM) {
4823 goto err_set_expr_alloc;
4825 expr = nft_set_elem_expr_alloc(ctx, set, tmp);
4827 err = PTR_ERR(expr);
4828 goto err_set_expr_alloc;
4838 for (i = 0; i < *num_exprs; i++)
4839 nft_expr_destroy(ctx, exprs[i]);
4844 static bool nft_set_is_same(const struct nft_set *set,
4845 const struct nft_set_desc *desc,
4846 struct nft_expr *exprs[], u32 num_exprs, u32 flags)
4850 if (set->ktype != desc->ktype ||
4851 set->dtype != desc->dtype ||
4852 set->flags != flags ||
4853 set->klen != desc->klen ||
4854 set->dlen != desc->dlen ||
4855 set->field_count != desc->field_count ||
4856 set->num_exprs != num_exprs)
4859 for (i = 0; i < desc->field_count; i++) {
4860 if (set->field_len[i] != desc->field_len[i])
4864 for (i = 0; i < num_exprs; i++) {
4865 if (set->exprs[i]->ops != exprs[i]->ops)
4872 static int nf_tables_newset(struct sk_buff *skb, const struct nfnl_info *info,
4873 const struct nlattr * const nla[])
4875 struct netlink_ext_ack *extack = info->extack;
4876 u8 genmask = nft_genmask_next(info->net);
4877 u8 family = info->nfmsg->nfgen_family;
4878 const struct nft_set_ops *ops;
4879 struct net *net = info->net;
4880 struct nft_set_desc desc;
4881 struct nft_table *table;
4882 unsigned char *udata;
4883 struct nft_set *set;
4893 if (nla[NFTA_SET_TABLE] == NULL ||
4894 nla[NFTA_SET_NAME] == NULL ||
4895 nla[NFTA_SET_KEY_LEN] == NULL ||
4896 nla[NFTA_SET_ID] == NULL)
4899 memset(&desc, 0, sizeof(desc));
4901 desc.ktype = NFT_DATA_VALUE;
4902 if (nla[NFTA_SET_KEY_TYPE] != NULL) {
4903 desc.ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
4904 if ((desc.ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
4908 desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
4909 if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
4913 if (nla[NFTA_SET_FLAGS] != NULL) {
4914 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
4915 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
4916 NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
4917 NFT_SET_MAP | NFT_SET_EVAL |
4918 NFT_SET_OBJECT | NFT_SET_CONCAT | NFT_SET_EXPR))
4920 /* Only one of these operations is supported */
4921 if ((flags & (NFT_SET_MAP | NFT_SET_OBJECT)) ==
4922 (NFT_SET_MAP | NFT_SET_OBJECT))
4924 if ((flags & (NFT_SET_EVAL | NFT_SET_OBJECT)) ==
4925 (NFT_SET_EVAL | NFT_SET_OBJECT))
4930 if (nla[NFTA_SET_DATA_TYPE] != NULL) {
4931 if (!(flags & NFT_SET_MAP))
4934 desc.dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
4935 if ((desc.dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
4936 desc.dtype != NFT_DATA_VERDICT)
4939 if (desc.dtype != NFT_DATA_VERDICT) {
4940 if (nla[NFTA_SET_DATA_LEN] == NULL)
4942 desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
4943 if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
4946 desc.dlen = sizeof(struct nft_verdict);
4947 } else if (flags & NFT_SET_MAP)
4950 if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
4951 if (!(flags & NFT_SET_OBJECT))
4954 desc.objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
4955 if (desc.objtype == NFT_OBJECT_UNSPEC ||
4956 desc.objtype > NFT_OBJECT_MAX)
4958 } else if (flags & NFT_SET_OBJECT)
4961 desc.objtype = NFT_OBJECT_UNSPEC;
4964 if (nla[NFTA_SET_TIMEOUT] != NULL) {
4965 if (!(flags & NFT_SET_TIMEOUT))
4968 if (flags & NFT_SET_ANONYMOUS)
4971 err = nf_msecs_to_jiffies64(nla[NFTA_SET_TIMEOUT], &desc.timeout);
4976 if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
4977 if (!(flags & NFT_SET_TIMEOUT))
4980 if (flags & NFT_SET_ANONYMOUS)
4983 desc.gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
4986 desc.policy = NFT_SET_POL_PERFORMANCE;
4987 if (nla[NFTA_SET_POLICY] != NULL)
4988 desc.policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
4990 if (nla[NFTA_SET_DESC] != NULL) {
4991 err = nf_tables_set_desc_parse(&desc, nla[NFTA_SET_DESC]);
4995 if (desc.field_count > 1 && !(flags & NFT_SET_CONCAT))
4997 } else if (flags & NFT_SET_CONCAT) {
5001 if (nla[NFTA_SET_EXPR] || nla[NFTA_SET_EXPRESSIONS])
5004 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, genmask,
5005 NETLINK_CB(skb).portid);
5006 if (IS_ERR(table)) {
5007 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
5008 return PTR_ERR(table);
5011 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
5013 set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
5015 if (PTR_ERR(set) != -ENOENT) {
5016 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
5017 return PTR_ERR(set);
5020 struct nft_expr *exprs[NFT_SET_EXPR_MAX] = {};
5022 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
5023 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
5026 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
5029 if (nft_set_is_anonymous(set))
5032 err = nft_set_expr_alloc(&ctx, set, nla, exprs, &num_exprs, flags);
5037 if (!nft_set_is_same(set, &desc, exprs, num_exprs, flags)) {
5038 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
5042 for (i = 0; i < num_exprs; i++)
5043 nft_expr_destroy(&ctx, exprs[i]);
5048 return __nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set, &desc);
5051 if (!(info->nlh->nlmsg_flags & NLM_F_CREATE))
5054 ops = nft_select_set_ops(&ctx, nla, &desc);
5056 return PTR_ERR(ops);
5059 if (nla[NFTA_SET_USERDATA])
5060 udlen = nla_len(nla[NFTA_SET_USERDATA]);
5063 if (ops->privsize != NULL)
5064 size = ops->privsize(nla, &desc);
5065 alloc_size = sizeof(*set) + size + udlen;
5066 if (alloc_size < size || alloc_size > INT_MAX)
5069 if (!nft_use_inc(&table->use))
5072 set = kvzalloc(alloc_size, GFP_KERNEL_ACCOUNT);
5078 name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL_ACCOUNT);
5084 err = nf_tables_set_alloc_name(&ctx, set, name);
5091 udata = set->data + size;
5092 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
5095 INIT_LIST_HEAD(&set->bindings);
5096 INIT_LIST_HEAD(&set->catchall_list);
5097 refcount_set(&set->refs, 1);
5099 write_pnet(&set->net, net);
5101 set->ktype = desc.ktype;
5102 set->klen = desc.klen;
5103 set->dtype = desc.dtype;
5104 set->objtype = desc.objtype;
5105 set->dlen = desc.dlen;
5107 set->size = desc.size;
5108 set->policy = desc.policy;
5111 set->timeout = desc.timeout;
5112 set->gc_int = desc.gc_int;
5114 set->field_count = desc.field_count;
5115 for (i = 0; i < desc.field_count; i++)
5116 set->field_len[i] = desc.field_len[i];
5118 err = ops->init(set, &desc, nla);
5122 err = nft_set_expr_alloc(&ctx, set, nla, set->exprs, &num_exprs, flags);
5124 goto err_set_destroy;
5126 set->num_exprs = num_exprs;
5127 set->handle = nf_tables_alloc_handle(table);
5128 INIT_LIST_HEAD(&set->pending_update);
5130 err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
5132 goto err_set_expr_alloc;
5134 list_add_tail_rcu(&set->list, &table->sets);
5139 for (i = 0; i < set->num_exprs; i++)
5140 nft_expr_destroy(&ctx, set->exprs[i]);
5142 ops->destroy(&ctx, set);
5148 nft_use_dec_restore(&table->use);
5153 static void nft_set_catchall_destroy(const struct nft_ctx *ctx,
5154 struct nft_set *set)
5156 struct nft_set_elem_catchall *next, *catchall;
5158 list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
5159 list_del_rcu(&catchall->list);
5160 nf_tables_set_elem_destroy(ctx, set, catchall->elem);
5161 kfree_rcu(catchall, rcu);
5165 static void nft_set_put(struct nft_set *set)
5167 if (refcount_dec_and_test(&set->refs)) {
5173 static void nft_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
5177 if (WARN_ON(set->use > 0))
5180 for (i = 0; i < set->num_exprs; i++)
5181 nft_expr_destroy(ctx, set->exprs[i]);
5183 set->ops->destroy(ctx, set);
5184 nft_set_catchall_destroy(ctx, set);
5188 static int nf_tables_delset(struct sk_buff *skb, const struct nfnl_info *info,
5189 const struct nlattr * const nla[])
5191 struct netlink_ext_ack *extack = info->extack;
5192 u8 genmask = nft_genmask_next(info->net);
5193 u8 family = info->nfmsg->nfgen_family;
5194 struct net *net = info->net;
5195 const struct nlattr *attr;
5196 struct nft_table *table;
5197 struct nft_set *set;
5200 if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
5201 return -EAFNOSUPPORT;
5203 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
5204 genmask, NETLINK_CB(skb).portid);
5205 if (IS_ERR(table)) {
5206 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
5207 return PTR_ERR(table);
5210 if (nla[NFTA_SET_HANDLE]) {
5211 attr = nla[NFTA_SET_HANDLE];
5212 set = nft_set_lookup_byhandle(table, attr, genmask);
5214 attr = nla[NFTA_SET_NAME];
5215 set = nft_set_lookup(table, attr, genmask);
5219 if (PTR_ERR(set) == -ENOENT &&
5220 NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYSET)
5223 NL_SET_BAD_ATTR(extack, attr);
5224 return PTR_ERR(set);
5227 (info->nlh->nlmsg_flags & NLM_F_NONREC &&
5228 atomic_read(&set->nelems) > 0)) {
5229 NL_SET_BAD_ATTR(extack, attr);
5233 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
5235 return nft_delset(&ctx, set);
5238 static int nft_validate_register_store(const struct nft_ctx *ctx,
5239 enum nft_registers reg,
5240 const struct nft_data *data,
5241 enum nft_data_types type,
5244 static int nft_setelem_data_validate(const struct nft_ctx *ctx,
5245 struct nft_set *set,
5246 struct nft_set_elem *elem)
5248 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5249 enum nft_registers dreg;
5251 dreg = nft_type_to_reg(set->dtype);
5252 return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
5253 set->dtype == NFT_DATA_VERDICT ?
5254 NFT_DATA_VERDICT : NFT_DATA_VALUE,
5258 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
5259 struct nft_set *set,
5260 const struct nft_set_iter *iter,
5261 struct nft_set_elem *elem)
5263 return nft_setelem_data_validate(ctx, set, elem);
5266 static int nft_set_catchall_bind_check(const struct nft_ctx *ctx,
5267 struct nft_set *set)
5269 u8 genmask = nft_genmask_next(ctx->net);
5270 struct nft_set_elem_catchall *catchall;
5271 struct nft_set_elem elem;
5272 struct nft_set_ext *ext;
5275 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5276 ext = nft_set_elem_ext(set, catchall->elem);
5277 if (!nft_set_elem_active(ext, genmask))
5280 elem.priv = catchall->elem;
5281 ret = nft_setelem_data_validate(ctx, set, &elem);
5289 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
5290 struct nft_set_binding *binding)
5292 struct nft_set_binding *i;
5293 struct nft_set_iter iter;
5295 if (!list_empty(&set->bindings) && nft_set_is_anonymous(set))
5298 if (binding->flags & NFT_SET_MAP) {
5299 /* If the set is already bound to the same chain all
5300 * jumps are already validated for that chain.
5302 list_for_each_entry(i, &set->bindings, list) {
5303 if (i->flags & NFT_SET_MAP &&
5304 i->chain == binding->chain)
5308 iter.genmask = nft_genmask_next(ctx->net);
5312 iter.fn = nf_tables_bind_check_setelem;
5314 set->ops->walk(ctx, set, &iter);
5316 iter.err = nft_set_catchall_bind_check(ctx, set);
5322 if (!nft_use_inc(&set->use))
5325 binding->chain = ctx->chain;
5326 list_add_tail_rcu(&binding->list, &set->bindings);
5327 nft_set_trans_bind(ctx, set);
5331 EXPORT_SYMBOL_GPL(nf_tables_bind_set);
5333 static void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
5334 struct nft_set_binding *binding, bool event)
5336 list_del_rcu(&binding->list);
5338 if (list_empty(&set->bindings) && nft_set_is_anonymous(set)) {
5339 list_del_rcu(&set->list);
5341 nf_tables_set_notify(ctx, set, NFT_MSG_DELSET,
5346 static void nft_setelem_data_activate(const struct net *net,
5347 const struct nft_set *set,
5348 struct nft_set_elem *elem);
5350 static int nft_mapelem_activate(const struct nft_ctx *ctx,
5351 struct nft_set *set,
5352 const struct nft_set_iter *iter,
5353 struct nft_set_elem *elem)
5355 nft_setelem_data_activate(ctx->net, set, elem);
5360 static void nft_map_catchall_activate(const struct nft_ctx *ctx,
5361 struct nft_set *set)
5363 u8 genmask = nft_genmask_next(ctx->net);
5364 struct nft_set_elem_catchall *catchall;
5365 struct nft_set_elem elem;
5366 struct nft_set_ext *ext;
5368 list_for_each_entry(catchall, &set->catchall_list, list) {
5369 ext = nft_set_elem_ext(set, catchall->elem);
5370 if (!nft_set_elem_active(ext, genmask))
5373 elem.priv = catchall->elem;
5374 nft_setelem_data_activate(ctx->net, set, &elem);
5379 static void nft_map_activate(const struct nft_ctx *ctx, struct nft_set *set)
5381 struct nft_set_iter iter = {
5382 .genmask = nft_genmask_next(ctx->net),
5383 .fn = nft_mapelem_activate,
5386 set->ops->walk(ctx, set, &iter);
5387 WARN_ON_ONCE(iter.err);
5389 nft_map_catchall_activate(ctx, set);
5392 void nf_tables_activate_set(const struct nft_ctx *ctx, struct nft_set *set)
5394 if (nft_set_is_anonymous(set)) {
5395 if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
5396 nft_map_activate(ctx, set);
5398 nft_clear(ctx->net, set);
5401 nft_use_inc_restore(&set->use);
5403 EXPORT_SYMBOL_GPL(nf_tables_activate_set);
5405 void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set,
5406 struct nft_set_binding *binding,
5407 enum nft_trans_phase phase)
5410 case NFT_TRANS_PREPARE_ERROR:
5411 nft_set_trans_unbind(ctx, set);
5412 if (nft_set_is_anonymous(set))
5413 nft_deactivate_next(ctx->net, set);
5415 list_del_rcu(&binding->list);
5417 nft_use_dec(&set->use);
5419 case NFT_TRANS_PREPARE:
5420 if (nft_set_is_anonymous(set)) {
5421 if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
5422 nft_map_deactivate(ctx, set);
5424 nft_deactivate_next(ctx->net, set);
5426 nft_use_dec(&set->use);
5428 case NFT_TRANS_ABORT:
5429 case NFT_TRANS_RELEASE:
5430 if (nft_set_is_anonymous(set) &&
5431 set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
5432 nft_map_deactivate(ctx, set);
5434 nft_use_dec(&set->use);
5437 nf_tables_unbind_set(ctx, set, binding,
5438 phase == NFT_TRANS_COMMIT);
5441 EXPORT_SYMBOL_GPL(nf_tables_deactivate_set);
5443 void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set)
5445 if (list_empty(&set->bindings) && nft_set_is_anonymous(set))
5446 nft_set_destroy(ctx, set);
5448 EXPORT_SYMBOL_GPL(nf_tables_destroy_set);
5450 const struct nft_set_ext_type nft_set_ext_types[] = {
5451 [NFT_SET_EXT_KEY] = {
5452 .align = __alignof__(u32),
5454 [NFT_SET_EXT_DATA] = {
5455 .align = __alignof__(u32),
5457 [NFT_SET_EXT_EXPRESSIONS] = {
5458 .align = __alignof__(struct nft_set_elem_expr),
5460 [NFT_SET_EXT_OBJREF] = {
5461 .len = sizeof(struct nft_object *),
5462 .align = __alignof__(struct nft_object *),
5464 [NFT_SET_EXT_FLAGS] = {
5466 .align = __alignof__(u8),
5468 [NFT_SET_EXT_TIMEOUT] = {
5470 .align = __alignof__(u64),
5472 [NFT_SET_EXT_EXPIRATION] = {
5474 .align = __alignof__(u64),
5476 [NFT_SET_EXT_USERDATA] = {
5477 .len = sizeof(struct nft_userdata),
5478 .align = __alignof__(struct nft_userdata),
5480 [NFT_SET_EXT_KEY_END] = {
5481 .align = __alignof__(u32),
5489 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
5490 [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED },
5491 [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED },
5492 [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 },
5493 [NFTA_SET_ELEM_TIMEOUT] = { .type = NLA_U64 },
5494 [NFTA_SET_ELEM_EXPIRATION] = { .type = NLA_U64 },
5495 [NFTA_SET_ELEM_USERDATA] = { .type = NLA_BINARY,
5496 .len = NFT_USERDATA_MAXLEN },
5497 [NFTA_SET_ELEM_EXPR] = { .type = NLA_NESTED },
5498 [NFTA_SET_ELEM_OBJREF] = { .type = NLA_STRING,
5499 .len = NFT_OBJ_MAXNAMELEN - 1 },
5500 [NFTA_SET_ELEM_KEY_END] = { .type = NLA_NESTED },
5501 [NFTA_SET_ELEM_EXPRESSIONS] = { .type = NLA_NESTED },
5504 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
5505 [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING,
5506 .len = NFT_TABLE_MAXNAMELEN - 1 },
5507 [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING,
5508 .len = NFT_SET_MAXNAMELEN - 1 },
5509 [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED },
5510 [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 },
5513 static int nft_set_elem_expr_dump(struct sk_buff *skb,
5514 const struct nft_set *set,
5515 const struct nft_set_ext *ext,
5518 struct nft_set_elem_expr *elem_expr;
5519 u32 size, num_exprs = 0;
5520 struct nft_expr *expr;
5521 struct nlattr *nest;
5523 elem_expr = nft_set_ext_expr(ext);
5524 nft_setelem_expr_foreach(expr, elem_expr, size)
5527 if (num_exprs == 1) {
5528 expr = nft_setelem_expr_at(elem_expr, 0);
5529 if (nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, expr, reset) < 0)
5533 } else if (num_exprs > 1) {
5534 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_EXPRESSIONS);
5536 goto nla_put_failure;
5538 nft_setelem_expr_foreach(expr, elem_expr, size) {
5539 expr = nft_setelem_expr_at(elem_expr, size);
5540 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr, reset) < 0)
5541 goto nla_put_failure;
5543 nla_nest_end(skb, nest);
5551 static int nf_tables_fill_setelem(struct sk_buff *skb,
5552 const struct nft_set *set,
5553 const struct nft_set_elem *elem,
5556 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5557 unsigned char *b = skb_tail_pointer(skb);
5558 struct nlattr *nest;
5560 nest = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
5562 goto nla_put_failure;
5564 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) &&
5565 nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
5566 NFT_DATA_VALUE, set->klen) < 0)
5567 goto nla_put_failure;
5569 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
5570 nft_data_dump(skb, NFTA_SET_ELEM_KEY_END, nft_set_ext_key_end(ext),
5571 NFT_DATA_VALUE, set->klen) < 0)
5572 goto nla_put_failure;
5574 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
5575 nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
5576 set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
5578 goto nla_put_failure;
5580 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS) &&
5581 nft_set_elem_expr_dump(skb, set, ext, reset))
5582 goto nla_put_failure;
5584 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
5585 nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
5586 (*nft_set_ext_obj(ext))->key.name) < 0)
5587 goto nla_put_failure;
5589 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
5590 nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
5591 htonl(*nft_set_ext_flags(ext))))
5592 goto nla_put_failure;
5594 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
5595 nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
5596 nf_jiffies64_to_msecs(*nft_set_ext_timeout(ext)),
5598 goto nla_put_failure;
5600 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
5601 u64 expires, now = get_jiffies_64();
5603 expires = *nft_set_ext_expiration(ext);
5604 if (time_before64(now, expires))
5609 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
5610 nf_jiffies64_to_msecs(expires),
5612 goto nla_put_failure;
5615 if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
5616 struct nft_userdata *udata;
5618 udata = nft_set_ext_userdata(ext);
5619 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
5620 udata->len + 1, udata->data))
5621 goto nla_put_failure;
5624 nla_nest_end(skb, nest);
5632 struct nft_set_dump_args {
5633 const struct netlink_callback *cb;
5634 struct nft_set_iter iter;
5635 struct sk_buff *skb;
5639 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
5640 struct nft_set *set,
5641 const struct nft_set_iter *iter,
5642 struct nft_set_elem *elem)
5644 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5645 struct nft_set_dump_args *args;
5647 if (nft_set_elem_expired(ext))
5650 args = container_of(iter, struct nft_set_dump_args, iter);
5651 return nf_tables_fill_setelem(args->skb, set, elem, args->reset);
5654 static void audit_log_nft_set_reset(const struct nft_table *table,
5655 unsigned int base_seq,
5656 unsigned int nentries)
5658 char *buf = kasprintf(GFP_ATOMIC, "%s:%u", table->name, base_seq);
5660 audit_log_nfcfg(buf, table->family, nentries,
5661 AUDIT_NFT_OP_SETELEM_RESET, GFP_ATOMIC);
5665 struct nft_set_dump_ctx {
5666 const struct nft_set *set;
5670 static int nft_set_catchall_dump(struct net *net, struct sk_buff *skb,
5671 const struct nft_set *set, bool reset,
5672 unsigned int base_seq)
5674 struct nft_set_elem_catchall *catchall;
5675 u8 genmask = nft_genmask_cur(net);
5676 struct nft_set_elem elem;
5677 struct nft_set_ext *ext;
5680 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5681 ext = nft_set_elem_ext(set, catchall->elem);
5682 if (!nft_set_elem_active(ext, genmask) ||
5683 nft_set_elem_expired(ext))
5686 elem.priv = catchall->elem;
5687 ret = nf_tables_fill_setelem(skb, set, &elem, reset);
5689 audit_log_nft_set_reset(set->table, base_seq, 1);
5696 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
5698 struct nft_set_dump_ctx *dump_ctx = cb->data;
5699 struct net *net = sock_net(skb->sk);
5700 struct nftables_pernet *nft_net;
5701 struct nft_table *table;
5702 struct nft_set *set;
5703 struct nft_set_dump_args args;
5704 bool set_found = false;
5705 struct nlmsghdr *nlh;
5706 struct nlattr *nest;
5712 nft_net = nft_pernet(net);
5713 cb->seq = READ_ONCE(nft_net->base_seq);
5715 list_for_each_entry_rcu(table, &nft_net->tables, list) {
5716 if (dump_ctx->ctx.family != NFPROTO_UNSPEC &&
5717 dump_ctx->ctx.family != table->family)
5720 if (table != dump_ctx->ctx.table)
5723 list_for_each_entry_rcu(set, &table->sets, list) {
5724 if (set == dump_ctx->set) {
5737 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM);
5738 portid = NETLINK_CB(cb->skb).portid;
5739 seq = cb->nlh->nlmsg_seq;
5741 nlh = nfnl_msg_put(skb, portid, seq, event, NLM_F_MULTI,
5742 table->family, NFNETLINK_V0, nft_base_seq(net));
5744 goto nla_put_failure;
5746 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name))
5747 goto nla_put_failure;
5748 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
5749 goto nla_put_failure;
5751 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
5753 goto nla_put_failure;
5755 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETSETELEM_RESET)
5761 args.iter.genmask = nft_genmask_cur(net);
5762 args.iter.skip = cb->args[0];
5763 args.iter.count = 0;
5765 args.iter.fn = nf_tables_dump_setelem;
5766 set->ops->walk(&dump_ctx->ctx, set, &args.iter);
5768 if (!args.iter.err && args.iter.count == cb->args[0])
5769 args.iter.err = nft_set_catchall_dump(net, skb, set,
5771 nla_nest_end(skb, nest);
5772 nlmsg_end(skb, nlh);
5774 if (reset && args.iter.count > args.iter.skip)
5775 audit_log_nft_set_reset(table, cb->seq,
5776 args.iter.count - args.iter.skip);
5780 if (args.iter.err && args.iter.err != -EMSGSIZE)
5781 return args.iter.err;
5782 if (args.iter.count == cb->args[0])
5785 cb->args[0] = args.iter.count;
5793 static int nf_tables_dump_set_start(struct netlink_callback *cb)
5795 struct nft_set_dump_ctx *dump_ctx = cb->data;
5797 cb->data = kmemdup(dump_ctx, sizeof(*dump_ctx), GFP_ATOMIC);
5799 return cb->data ? 0 : -ENOMEM;
5802 static int nf_tables_dump_set_done(struct netlink_callback *cb)
5808 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
5809 const struct nft_ctx *ctx, u32 seq,
5810 u32 portid, int event, u16 flags,
5811 const struct nft_set *set,
5812 const struct nft_set_elem *elem,
5815 struct nlmsghdr *nlh;
5816 struct nlattr *nest;
5819 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
5820 nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
5821 NFNETLINK_V0, nft_base_seq(ctx->net));
5823 goto nla_put_failure;
5825 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
5826 goto nla_put_failure;
5827 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
5828 goto nla_put_failure;
5830 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
5832 goto nla_put_failure;
5834 err = nf_tables_fill_setelem(skb, set, elem, reset);
5836 goto nla_put_failure;
5838 nla_nest_end(skb, nest);
5840 nlmsg_end(skb, nlh);
5844 nlmsg_trim(skb, nlh);
5848 static int nft_setelem_parse_flags(const struct nft_set *set,
5849 const struct nlattr *attr, u32 *flags)
5854 *flags = ntohl(nla_get_be32(attr));
5855 if (*flags & ~(NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL))
5857 if (!(set->flags & NFT_SET_INTERVAL) &&
5858 *flags & NFT_SET_ELEM_INTERVAL_END)
5860 if ((*flags & (NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL)) ==
5861 (NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL))
5867 static int nft_setelem_parse_key(struct nft_ctx *ctx, struct nft_set *set,
5868 struct nft_data *key, struct nlattr *attr)
5870 struct nft_data_desc desc = {
5871 .type = NFT_DATA_VALUE,
5872 .size = NFT_DATA_VALUE_MAXLEN,
5876 return nft_data_init(ctx, key, &desc, attr);
5879 static int nft_setelem_parse_data(struct nft_ctx *ctx, struct nft_set *set,
5880 struct nft_data_desc *desc,
5881 struct nft_data *data,
5882 struct nlattr *attr)
5886 if (set->dtype == NFT_DATA_VERDICT)
5887 dtype = NFT_DATA_VERDICT;
5889 dtype = NFT_DATA_VALUE;
5892 desc->size = NFT_DATA_VALUE_MAXLEN;
5893 desc->len = set->dlen;
5894 desc->flags = NFT_DATA_DESC_SETELEM;
5896 return nft_data_init(ctx, data, desc, attr);
5899 static void *nft_setelem_catchall_get(const struct net *net,
5900 const struct nft_set *set)
5902 struct nft_set_elem_catchall *catchall;
5903 u8 genmask = nft_genmask_cur(net);
5904 struct nft_set_ext *ext;
5907 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5908 ext = nft_set_elem_ext(set, catchall->elem);
5909 if (!nft_set_elem_active(ext, genmask) ||
5910 nft_set_elem_expired(ext))
5913 priv = catchall->elem;
5920 static int nft_setelem_get(struct nft_ctx *ctx, struct nft_set *set,
5921 struct nft_set_elem *elem, u32 flags)
5925 if (!(flags & NFT_SET_ELEM_CATCHALL)) {
5926 priv = set->ops->get(ctx->net, set, elem, flags);
5928 return PTR_ERR(priv);
5930 priv = nft_setelem_catchall_get(ctx->net, set);
5939 static int nft_get_set_elem(struct nft_ctx *ctx, struct nft_set *set,
5940 const struct nlattr *attr, bool reset)
5942 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
5943 struct nft_set_elem elem;
5944 struct sk_buff *skb;
5948 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
5949 nft_set_elem_policy, NULL);
5953 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
5957 if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
5960 if (nla[NFTA_SET_ELEM_KEY]) {
5961 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
5962 nla[NFTA_SET_ELEM_KEY]);
5967 if (nla[NFTA_SET_ELEM_KEY_END]) {
5968 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
5969 nla[NFTA_SET_ELEM_KEY_END]);
5974 err = nft_setelem_get(ctx, set, &elem, flags);
5979 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
5983 err = nf_tables_fill_setelem_info(skb, ctx, ctx->seq, ctx->portid,
5984 NFT_MSG_NEWSETELEM, 0, set, &elem,
5987 goto err_fill_setelem;
5989 return nfnetlink_unicast(skb, ctx->net, ctx->portid);
5996 /* called with rcu_read_lock held */
5997 static int nf_tables_getsetelem(struct sk_buff *skb,
5998 const struct nfnl_info *info,
5999 const struct nlattr * const nla[])
6001 struct netlink_ext_ack *extack = info->extack;
6002 u8 genmask = nft_genmask_cur(info->net);
6003 u8 family = info->nfmsg->nfgen_family;
6004 int rem, err = 0, nelems = 0;
6005 struct net *net = info->net;
6006 struct nft_table *table;
6007 struct nft_set *set;
6008 struct nlattr *attr;
6012 table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
6014 if (IS_ERR(table)) {
6015 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
6016 return PTR_ERR(table);
6019 set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
6021 return PTR_ERR(set);
6023 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6025 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
6026 struct netlink_dump_control c = {
6027 .start = nf_tables_dump_set_start,
6028 .dump = nf_tables_dump_set,
6029 .done = nf_tables_dump_set_done,
6030 .module = THIS_MODULE,
6032 struct nft_set_dump_ctx dump_ctx = {
6038 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
6041 if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
6044 if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_GETSETELEM_RESET)
6047 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
6048 err = nft_get_set_elem(&ctx, set, attr, reset);
6050 NL_SET_BAD_ATTR(extack, attr);
6057 audit_log_nft_set_reset(table, nft_pernet(net)->base_seq,
6063 static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
6064 const struct nft_set *set,
6065 const struct nft_set_elem *elem,
6068 struct nftables_pernet *nft_net;
6069 struct net *net = ctx->net;
6070 u32 portid = ctx->portid;
6071 struct sk_buff *skb;
6075 if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
6078 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
6082 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
6083 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
6085 err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
6092 nft_net = nft_pernet(net);
6093 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
6096 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
6099 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
6101 struct nft_set *set)
6103 struct nft_trans *trans;
6105 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
6109 nft_trans_elem_set(trans) = set;
6113 struct nft_expr *nft_set_elem_expr_alloc(const struct nft_ctx *ctx,
6114 const struct nft_set *set,
6115 const struct nlattr *attr)
6117 struct nft_expr *expr;
6120 expr = nft_expr_init(ctx, attr);
6125 if (expr->ops->type->flags & NFT_EXPR_GC) {
6126 if (set->flags & NFT_SET_TIMEOUT)
6127 goto err_set_elem_expr;
6128 if (!set->ops->gc_init)
6129 goto err_set_elem_expr;
6130 set->ops->gc_init(set);
6136 nft_expr_destroy(ctx, expr);
6137 return ERR_PTR(err);
6140 static int nft_set_ext_check(const struct nft_set_ext_tmpl *tmpl, u8 id, u32 len)
6142 len += nft_set_ext_types[id].len;
6143 if (len > tmpl->ext_len[id] ||
6150 static int nft_set_ext_memcpy(const struct nft_set_ext_tmpl *tmpl, u8 id,
6151 void *to, const void *from, u32 len)
6153 if (nft_set_ext_check(tmpl, id, len) < 0)
6156 memcpy(to, from, len);
6161 void *nft_set_elem_init(const struct nft_set *set,
6162 const struct nft_set_ext_tmpl *tmpl,
6163 const u32 *key, const u32 *key_end,
6164 const u32 *data, u64 timeout, u64 expiration, gfp_t gfp)
6166 struct nft_set_ext *ext;
6169 elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
6171 return ERR_PTR(-ENOMEM);
6173 ext = nft_set_elem_ext(set, elem);
6174 nft_set_ext_init(ext, tmpl);
6176 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) &&
6177 nft_set_ext_memcpy(tmpl, NFT_SET_EXT_KEY,
6178 nft_set_ext_key(ext), key, set->klen) < 0)
6181 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
6182 nft_set_ext_memcpy(tmpl, NFT_SET_EXT_KEY_END,
6183 nft_set_ext_key_end(ext), key_end, set->klen) < 0)
6186 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
6187 nft_set_ext_memcpy(tmpl, NFT_SET_EXT_DATA,
6188 nft_set_ext_data(ext), data, set->dlen) < 0)
6191 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
6192 *nft_set_ext_expiration(ext) = get_jiffies_64() + expiration;
6193 if (expiration == 0)
6194 *nft_set_ext_expiration(ext) += timeout;
6196 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
6197 *nft_set_ext_timeout(ext) = timeout;
6204 return ERR_PTR(-EINVAL);
6207 static void __nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
6208 struct nft_expr *expr)
6210 if (expr->ops->destroy_clone) {
6211 expr->ops->destroy_clone(ctx, expr);
6212 module_put(expr->ops->type->owner);
6214 nf_tables_expr_destroy(ctx, expr);
6218 static void nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
6219 struct nft_set_elem_expr *elem_expr)
6221 struct nft_expr *expr;
6224 nft_setelem_expr_foreach(expr, elem_expr, size)
6225 __nft_set_elem_expr_destroy(ctx, expr);
6228 /* Drop references and destroy. Called from gc, dynset and abort path. */
6229 void nft_set_elem_destroy(const struct nft_set *set, void *elem,
6232 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
6233 struct nft_ctx ctx = {
6234 .net = read_pnet(&set->net),
6235 .family = set->table->family,
6238 nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE);
6239 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6240 nft_data_release(nft_set_ext_data(ext), set->dtype);
6241 if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
6242 nft_set_elem_expr_destroy(&ctx, nft_set_ext_expr(ext));
6244 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6245 nft_use_dec(&(*nft_set_ext_obj(ext))->use);
6248 EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
6250 /* Destroy element. References have been already dropped in the preparation
6251 * path via nft_setelem_data_deactivate().
6253 void nf_tables_set_elem_destroy(const struct nft_ctx *ctx,
6254 const struct nft_set *set, void *elem)
6256 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
6258 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
6259 nft_set_elem_expr_destroy(ctx, nft_set_ext_expr(ext));
6264 int nft_set_elem_expr_clone(const struct nft_ctx *ctx, struct nft_set *set,
6265 struct nft_expr *expr_array[])
6267 struct nft_expr *expr;
6270 for (i = 0; i < set->num_exprs; i++) {
6271 expr = kzalloc(set->exprs[i]->ops->size, GFP_KERNEL_ACCOUNT);
6275 err = nft_expr_clone(expr, set->exprs[i]);
6280 expr_array[i] = expr;
6286 for (k = i - 1; k >= 0; k--)
6287 nft_expr_destroy(ctx, expr_array[k]);
6292 static int nft_set_elem_expr_setup(struct nft_ctx *ctx,
6293 const struct nft_set_ext_tmpl *tmpl,
6294 const struct nft_set_ext *ext,
6295 struct nft_expr *expr_array[],
6298 struct nft_set_elem_expr *elem_expr = nft_set_ext_expr(ext);
6299 u32 len = sizeof(struct nft_set_elem_expr);
6300 struct nft_expr *expr;
6306 for (i = 0; i < num_exprs; i++)
6307 len += expr_array[i]->ops->size;
6309 if (nft_set_ext_check(tmpl, NFT_SET_EXT_EXPRESSIONS, len) < 0)
6312 for (i = 0; i < num_exprs; i++) {
6313 expr = nft_setelem_expr_at(elem_expr, elem_expr->size);
6314 err = nft_expr_clone(expr, expr_array[i]);
6316 goto err_elem_expr_setup;
6318 elem_expr->size += expr_array[i]->ops->size;
6319 nft_expr_destroy(ctx, expr_array[i]);
6320 expr_array[i] = NULL;
6325 err_elem_expr_setup:
6326 for (; i < num_exprs; i++) {
6327 nft_expr_destroy(ctx, expr_array[i]);
6328 expr_array[i] = NULL;
6334 struct nft_set_ext *nft_set_catchall_lookup(const struct net *net,
6335 const struct nft_set *set)
6337 struct nft_set_elem_catchall *catchall;
6338 u8 genmask = nft_genmask_cur(net);
6339 struct nft_set_ext *ext;
6341 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
6342 ext = nft_set_elem_ext(set, catchall->elem);
6343 if (nft_set_elem_active(ext, genmask) &&
6344 !nft_set_elem_expired(ext) &&
6345 !nft_set_elem_is_dead(ext))
6351 EXPORT_SYMBOL_GPL(nft_set_catchall_lookup);
6353 static int nft_setelem_catchall_insert(const struct net *net,
6354 struct nft_set *set,
6355 const struct nft_set_elem *elem,
6356 struct nft_set_ext **pext)
6358 struct nft_set_elem_catchall *catchall;
6359 u8 genmask = nft_genmask_next(net);
6360 struct nft_set_ext *ext;
6362 list_for_each_entry(catchall, &set->catchall_list, list) {
6363 ext = nft_set_elem_ext(set, catchall->elem);
6364 if (nft_set_elem_active(ext, genmask)) {
6370 catchall = kmalloc(sizeof(*catchall), GFP_KERNEL);
6374 catchall->elem = elem->priv;
6375 list_add_tail_rcu(&catchall->list, &set->catchall_list);
6380 static int nft_setelem_insert(const struct net *net,
6381 struct nft_set *set,
6382 const struct nft_set_elem *elem,
6383 struct nft_set_ext **ext, unsigned int flags)
6387 if (flags & NFT_SET_ELEM_CATCHALL)
6388 ret = nft_setelem_catchall_insert(net, set, elem, ext);
6390 ret = set->ops->insert(net, set, elem, ext);
6395 static bool nft_setelem_is_catchall(const struct nft_set *set,
6396 const struct nft_set_elem *elem)
6398 struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6400 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
6401 *nft_set_ext_flags(ext) & NFT_SET_ELEM_CATCHALL)
6407 static void nft_setelem_activate(struct net *net, struct nft_set *set,
6408 struct nft_set_elem *elem)
6410 struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6412 if (nft_setelem_is_catchall(set, elem)) {
6413 nft_set_elem_change_active(net, set, ext);
6415 set->ops->activate(net, set, elem);
6419 static int nft_setelem_catchall_deactivate(const struct net *net,
6420 struct nft_set *set,
6421 struct nft_set_elem *elem)
6423 struct nft_set_elem_catchall *catchall;
6424 struct nft_set_ext *ext;
6426 list_for_each_entry(catchall, &set->catchall_list, list) {
6427 ext = nft_set_elem_ext(set, catchall->elem);
6428 if (!nft_is_active(net, ext))
6432 elem->priv = catchall->elem;
6433 nft_set_elem_change_active(net, set, ext);
6440 static int __nft_setelem_deactivate(const struct net *net,
6441 struct nft_set *set,
6442 struct nft_set_elem *elem)
6446 priv = set->ops->deactivate(net, set, elem);
6457 static int nft_setelem_deactivate(const struct net *net,
6458 struct nft_set *set,
6459 struct nft_set_elem *elem, u32 flags)
6463 if (flags & NFT_SET_ELEM_CATCHALL)
6464 ret = nft_setelem_catchall_deactivate(net, set, elem);
6466 ret = __nft_setelem_deactivate(net, set, elem);
6471 static void nft_setelem_catchall_remove(const struct net *net,
6472 const struct nft_set *set,
6473 const struct nft_set_elem *elem)
6475 struct nft_set_elem_catchall *catchall, *next;
6477 list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
6478 if (catchall->elem == elem->priv) {
6479 list_del_rcu(&catchall->list);
6480 kfree_rcu(catchall, rcu);
6486 static void nft_setelem_remove(const struct net *net,
6487 const struct nft_set *set,
6488 const struct nft_set_elem *elem)
6490 if (nft_setelem_is_catchall(set, elem))
6491 nft_setelem_catchall_remove(net, set, elem);
6493 set->ops->remove(net, set, elem);
6496 static bool nft_setelem_valid_key_end(const struct nft_set *set,
6497 struct nlattr **nla, u32 flags)
6499 if ((set->flags & (NFT_SET_CONCAT | NFT_SET_INTERVAL)) ==
6500 (NFT_SET_CONCAT | NFT_SET_INTERVAL)) {
6501 if (flags & NFT_SET_ELEM_INTERVAL_END)
6504 if (nla[NFTA_SET_ELEM_KEY_END] &&
6505 flags & NFT_SET_ELEM_CATCHALL)
6508 if (nla[NFTA_SET_ELEM_KEY_END])
6515 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
6516 const struct nlattr *attr, u32 nlmsg_flags)
6518 struct nft_expr *expr_array[NFT_SET_EXPR_MAX] = {};
6519 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
6520 u8 genmask = nft_genmask_next(ctx->net);
6521 u32 flags = 0, size = 0, num_exprs = 0;
6522 struct nft_set_ext_tmpl tmpl;
6523 struct nft_set_ext *ext, *ext2;
6524 struct nft_set_elem elem;
6525 struct nft_set_binding *binding;
6526 struct nft_object *obj = NULL;
6527 struct nft_userdata *udata;
6528 struct nft_data_desc desc;
6529 enum nft_registers dreg;
6530 struct nft_trans *trans;
6536 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
6537 nft_set_elem_policy, NULL);
6541 nft_set_ext_prepare(&tmpl);
6543 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
6547 if (((flags & NFT_SET_ELEM_CATCHALL) && nla[NFTA_SET_ELEM_KEY]) ||
6548 (!(flags & NFT_SET_ELEM_CATCHALL) && !nla[NFTA_SET_ELEM_KEY]))
6552 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
6557 if (set->flags & NFT_SET_MAP) {
6558 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
6559 !(flags & NFT_SET_ELEM_INTERVAL_END))
6562 if (nla[NFTA_SET_ELEM_DATA] != NULL)
6566 if (set->flags & NFT_SET_OBJECT) {
6567 if (!nla[NFTA_SET_ELEM_OBJREF] &&
6568 !(flags & NFT_SET_ELEM_INTERVAL_END))
6571 if (nla[NFTA_SET_ELEM_OBJREF])
6575 if (!nft_setelem_valid_key_end(set, nla, flags))
6578 if ((flags & NFT_SET_ELEM_INTERVAL_END) &&
6579 (nla[NFTA_SET_ELEM_DATA] ||
6580 nla[NFTA_SET_ELEM_OBJREF] ||
6581 nla[NFTA_SET_ELEM_TIMEOUT] ||
6582 nla[NFTA_SET_ELEM_EXPIRATION] ||
6583 nla[NFTA_SET_ELEM_USERDATA] ||
6584 nla[NFTA_SET_ELEM_EXPR] ||
6585 nla[NFTA_SET_ELEM_KEY_END] ||
6586 nla[NFTA_SET_ELEM_EXPRESSIONS]))
6590 if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
6591 if (!(set->flags & NFT_SET_TIMEOUT))
6593 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_TIMEOUT],
6597 } else if (set->flags & NFT_SET_TIMEOUT &&
6598 !(flags & NFT_SET_ELEM_INTERVAL_END)) {
6599 timeout = READ_ONCE(set->timeout);
6603 if (nla[NFTA_SET_ELEM_EXPIRATION] != NULL) {
6604 if (!(set->flags & NFT_SET_TIMEOUT))
6606 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_EXPIRATION],
6612 if (nla[NFTA_SET_ELEM_EXPR]) {
6613 struct nft_expr *expr;
6615 if (set->num_exprs && set->num_exprs != 1)
6618 expr = nft_set_elem_expr_alloc(ctx, set,
6619 nla[NFTA_SET_ELEM_EXPR]);
6621 return PTR_ERR(expr);
6623 expr_array[0] = expr;
6626 if (set->num_exprs && set->exprs[0]->ops != expr->ops) {
6628 goto err_set_elem_expr;
6630 } else if (nla[NFTA_SET_ELEM_EXPRESSIONS]) {
6631 struct nft_expr *expr;
6636 nla_for_each_nested(tmp, nla[NFTA_SET_ELEM_EXPRESSIONS], left) {
6637 if (i == NFT_SET_EXPR_MAX ||
6638 (set->num_exprs && set->num_exprs == i)) {
6640 goto err_set_elem_expr;
6642 if (nla_type(tmp) != NFTA_LIST_ELEM) {
6644 goto err_set_elem_expr;
6646 expr = nft_set_elem_expr_alloc(ctx, set, tmp);
6648 err = PTR_ERR(expr);
6649 goto err_set_elem_expr;
6651 expr_array[i] = expr;
6654 if (set->num_exprs && expr->ops != set->exprs[i]->ops) {
6656 goto err_set_elem_expr;
6660 if (set->num_exprs && set->num_exprs != i) {
6662 goto err_set_elem_expr;
6664 } else if (set->num_exprs > 0 &&
6665 !(flags & NFT_SET_ELEM_INTERVAL_END)) {
6666 err = nft_set_elem_expr_clone(ctx, set, expr_array);
6668 goto err_set_elem_expr_clone;
6670 num_exprs = set->num_exprs;
6673 if (nla[NFTA_SET_ELEM_KEY]) {
6674 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
6675 nla[NFTA_SET_ELEM_KEY]);
6677 goto err_set_elem_expr;
6679 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
6684 if (nla[NFTA_SET_ELEM_KEY_END]) {
6685 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
6686 nla[NFTA_SET_ELEM_KEY_END]);
6690 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
6692 goto err_parse_key_end;
6696 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
6698 goto err_parse_key_end;
6700 if (timeout != READ_ONCE(set->timeout)) {
6701 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
6703 goto err_parse_key_end;
6708 for (i = 0; i < num_exprs; i++)
6709 size += expr_array[i]->ops->size;
6711 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_EXPRESSIONS,
6712 sizeof(struct nft_set_elem_expr) + size);
6714 goto err_parse_key_end;
6717 if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
6718 obj = nft_obj_lookup(ctx->net, ctx->table,
6719 nla[NFTA_SET_ELEM_OBJREF],
6720 set->objtype, genmask);
6724 goto err_parse_key_end;
6727 if (!nft_use_inc(&obj->use)) {
6730 goto err_parse_key_end;
6733 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
6735 goto err_parse_key_end;
6738 if (nla[NFTA_SET_ELEM_DATA] != NULL) {
6739 err = nft_setelem_parse_data(ctx, set, &desc, &elem.data.val,
6740 nla[NFTA_SET_ELEM_DATA]);
6742 goto err_parse_key_end;
6744 dreg = nft_type_to_reg(set->dtype);
6745 list_for_each_entry(binding, &set->bindings, list) {
6746 struct nft_ctx bind_ctx = {
6748 .family = ctx->family,
6749 .table = ctx->table,
6750 .chain = (struct nft_chain *)binding->chain,
6753 if (!(binding->flags & NFT_SET_MAP))
6756 err = nft_validate_register_store(&bind_ctx, dreg,
6758 desc.type, desc.len);
6760 goto err_parse_data;
6762 if (desc.type == NFT_DATA_VERDICT &&
6763 (elem.data.val.verdict.code == NFT_GOTO ||
6764 elem.data.val.verdict.code == NFT_JUMP))
6765 nft_validate_state_update(ctx->table,
6769 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, desc.len);
6771 goto err_parse_data;
6774 /* The full maximum length of userdata can exceed the maximum
6775 * offset value (U8_MAX) for following extensions, therefor it
6776 * must be the last extension added.
6779 if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
6780 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
6782 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
6785 goto err_parse_data;
6789 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
6790 elem.key_end.val.data, elem.data.val.data,
6791 timeout, expiration, GFP_KERNEL_ACCOUNT);
6792 if (IS_ERR(elem.priv)) {
6793 err = PTR_ERR(elem.priv);
6794 goto err_parse_data;
6797 ext = nft_set_elem_ext(set, elem.priv);
6799 *nft_set_ext_flags(ext) = flags;
6802 *nft_set_ext_obj(ext) = obj;
6805 if (nft_set_ext_check(&tmpl, NFT_SET_EXT_USERDATA, ulen) < 0) {
6809 udata = nft_set_ext_userdata(ext);
6810 udata->len = ulen - 1;
6811 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
6813 err = nft_set_elem_expr_setup(ctx, &tmpl, ext, expr_array, num_exprs);
6817 trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
6818 if (trans == NULL) {
6823 ext->genmask = nft_genmask_cur(ctx->net);
6825 err = nft_setelem_insert(ctx->net, set, &elem, &ext2, flags);
6827 if (err == -EEXIST) {
6828 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^
6829 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) ||
6830 nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^
6831 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF))
6832 goto err_element_clash;
6833 if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
6834 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
6835 memcmp(nft_set_ext_data(ext),
6836 nft_set_ext_data(ext2), set->dlen) != 0) ||
6837 (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
6838 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
6839 *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
6840 goto err_element_clash;
6841 else if (!(nlmsg_flags & NLM_F_EXCL))
6843 } else if (err == -ENOTEMPTY) {
6844 /* ENOTEMPTY reports overlapping between this element
6845 * and an existing one.
6849 goto err_element_clash;
6852 if (!(flags & NFT_SET_ELEM_CATCHALL)) {
6853 unsigned int max = set->size ? set->size + set->ndeact : UINT_MAX;
6855 if (!atomic_add_unless(&set->nelems, 1, max)) {
6861 nft_trans_elem(trans) = elem;
6862 nft_trans_commit_list_add_tail(ctx->net, trans);
6866 nft_setelem_remove(ctx->net, set, &elem);
6870 nf_tables_set_elem_destroy(ctx, set, elem.priv);
6872 if (nla[NFTA_SET_ELEM_DATA] != NULL)
6873 nft_data_release(&elem.data.val, desc.type);
6876 nft_use_dec_restore(&obj->use);
6878 nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
6880 nft_data_release(&elem.key.val, NFT_DATA_VALUE);
6882 for (i = 0; i < num_exprs && expr_array[i]; i++)
6883 nft_expr_destroy(ctx, expr_array[i]);
6884 err_set_elem_expr_clone:
6888 static int nf_tables_newsetelem(struct sk_buff *skb,
6889 const struct nfnl_info *info,
6890 const struct nlattr * const nla[])
6892 struct netlink_ext_ack *extack = info->extack;
6893 u8 genmask = nft_genmask_next(info->net);
6894 u8 family = info->nfmsg->nfgen_family;
6895 struct net *net = info->net;
6896 const struct nlattr *attr;
6897 struct nft_table *table;
6898 struct nft_set *set;
6902 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
6905 table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
6906 genmask, NETLINK_CB(skb).portid);
6907 if (IS_ERR(table)) {
6908 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
6909 return PTR_ERR(table);
6912 set = nft_set_lookup_global(net, table, nla[NFTA_SET_ELEM_LIST_SET],
6913 nla[NFTA_SET_ELEM_LIST_SET_ID], genmask);
6915 return PTR_ERR(set);
6917 if (!list_empty(&set->bindings) &&
6918 (set->flags & (NFT_SET_CONSTANT | NFT_SET_ANONYMOUS)))
6921 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6923 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
6924 err = nft_add_set_elem(&ctx, set, attr, info->nlh->nlmsg_flags);
6926 NL_SET_BAD_ATTR(extack, attr);
6931 if (table->validate_state == NFT_VALIDATE_DO)
6932 return nft_table_validate(net, table);
6938 * nft_data_hold - hold a nft_data item
6940 * @data: struct nft_data to release
6941 * @type: type of data
6943 * Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded,
6944 * NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and
6945 * NFT_GOTO verdicts. This function must be called on active data objects
6946 * from the second phase of the commit protocol.
6948 void nft_data_hold(const struct nft_data *data, enum nft_data_types type)
6950 struct nft_chain *chain;
6952 if (type == NFT_DATA_VERDICT) {
6953 switch (data->verdict.code) {
6956 chain = data->verdict.chain;
6957 nft_use_inc_restore(&chain->use);
6963 static void nft_setelem_data_activate(const struct net *net,
6964 const struct nft_set *set,
6965 struct nft_set_elem *elem)
6967 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6969 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6970 nft_data_hold(nft_set_ext_data(ext), set->dtype);
6971 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6972 nft_use_inc_restore(&(*nft_set_ext_obj(ext))->use);
6975 void nft_setelem_data_deactivate(const struct net *net,
6976 const struct nft_set *set,
6977 struct nft_set_elem *elem)
6979 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6981 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6982 nft_data_release(nft_set_ext_data(ext), set->dtype);
6983 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6984 nft_use_dec(&(*nft_set_ext_obj(ext))->use);
6987 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
6988 const struct nlattr *attr)
6990 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
6991 struct nft_set_ext_tmpl tmpl;
6992 struct nft_set_elem elem;
6993 struct nft_set_ext *ext;
6994 struct nft_trans *trans;
6998 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
6999 nft_set_elem_policy, NULL);
7003 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
7007 if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
7010 if (!nft_setelem_valid_key_end(set, nla, flags))
7013 nft_set_ext_prepare(&tmpl);
7016 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
7021 if (nla[NFTA_SET_ELEM_KEY]) {
7022 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
7023 nla[NFTA_SET_ELEM_KEY]);
7027 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
7032 if (nla[NFTA_SET_ELEM_KEY_END]) {
7033 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
7034 nla[NFTA_SET_ELEM_KEY_END]);
7038 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
7040 goto fail_elem_key_end;
7044 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
7045 elem.key_end.val.data, NULL, 0, 0,
7046 GFP_KERNEL_ACCOUNT);
7047 if (IS_ERR(elem.priv)) {
7048 err = PTR_ERR(elem.priv);
7049 goto fail_elem_key_end;
7052 ext = nft_set_elem_ext(set, elem.priv);
7054 *nft_set_ext_flags(ext) = flags;
7056 trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
7060 err = nft_setelem_deactivate(ctx->net, set, &elem, flags);
7064 nft_setelem_data_deactivate(ctx->net, set, &elem);
7066 nft_trans_elem(trans) = elem;
7067 nft_trans_commit_list_add_tail(ctx->net, trans);
7075 nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
7077 nft_data_release(&elem.key.val, NFT_DATA_VALUE);
7081 static int nft_setelem_flush(const struct nft_ctx *ctx,
7082 struct nft_set *set,
7083 const struct nft_set_iter *iter,
7084 struct nft_set_elem *elem)
7086 struct nft_trans *trans;
7089 trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
7090 sizeof(struct nft_trans_elem), GFP_ATOMIC);
7094 if (!set->ops->flush(ctx->net, set, elem->priv)) {
7100 nft_setelem_data_deactivate(ctx->net, set, elem);
7101 nft_trans_elem_set(trans) = set;
7102 nft_trans_elem(trans) = *elem;
7103 nft_trans_commit_list_add_tail(ctx->net, trans);
7111 static int __nft_set_catchall_flush(const struct nft_ctx *ctx,
7112 struct nft_set *set,
7113 struct nft_set_elem *elem)
7115 struct nft_trans *trans;
7117 trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
7118 sizeof(struct nft_trans_elem), GFP_KERNEL);
7122 nft_setelem_data_deactivate(ctx->net, set, elem);
7123 nft_trans_elem_set(trans) = set;
7124 nft_trans_elem(trans) = *elem;
7125 nft_trans_commit_list_add_tail(ctx->net, trans);
7130 static int nft_set_catchall_flush(const struct nft_ctx *ctx,
7131 struct nft_set *set)
7133 u8 genmask = nft_genmask_next(ctx->net);
7134 struct nft_set_elem_catchall *catchall;
7135 struct nft_set_elem elem;
7136 struct nft_set_ext *ext;
7139 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
7140 ext = nft_set_elem_ext(set, catchall->elem);
7141 if (!nft_set_elem_active(ext, genmask))
7144 elem.priv = catchall->elem;
7145 ret = __nft_set_catchall_flush(ctx, set, &elem);
7148 nft_set_elem_change_active(ctx->net, set, ext);
7154 static int nft_set_flush(struct nft_ctx *ctx, struct nft_set *set, u8 genmask)
7156 struct nft_set_iter iter = {
7158 .fn = nft_setelem_flush,
7161 set->ops->walk(ctx, set, &iter);
7163 iter.err = nft_set_catchall_flush(ctx, set);
7168 static int nf_tables_delsetelem(struct sk_buff *skb,
7169 const struct nfnl_info *info,
7170 const struct nlattr * const nla[])
7172 struct netlink_ext_ack *extack = info->extack;
7173 u8 genmask = nft_genmask_next(info->net);
7174 u8 family = info->nfmsg->nfgen_family;
7175 struct net *net = info->net;
7176 const struct nlattr *attr;
7177 struct nft_table *table;
7178 struct nft_set *set;
7182 table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
7183 genmask, NETLINK_CB(skb).portid);
7184 if (IS_ERR(table)) {
7185 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
7186 return PTR_ERR(table);
7189 set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
7191 return PTR_ERR(set);
7193 if (nft_set_is_anonymous(set))
7196 if (!list_empty(&set->bindings) && (set->flags & NFT_SET_CONSTANT))
7199 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7201 if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
7202 return nft_set_flush(&ctx, set, genmask);
7204 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
7205 err = nft_del_setelem(&ctx, set, attr);
7206 if (err == -ENOENT &&
7207 NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYSETELEM)
7211 NL_SET_BAD_ATTR(extack, attr);
7223 * nft_register_obj- register nf_tables stateful object type
7224 * @obj_type: object type
7226 * Registers the object type for use with nf_tables. Returns zero on
7227 * success or a negative errno code otherwise.
7229 int nft_register_obj(struct nft_object_type *obj_type)
7231 if (obj_type->type == NFT_OBJECT_UNSPEC)
7234 nfnl_lock(NFNL_SUBSYS_NFTABLES);
7235 list_add_rcu(&obj_type->list, &nf_tables_objects);
7236 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7239 EXPORT_SYMBOL_GPL(nft_register_obj);
7242 * nft_unregister_obj - unregister nf_tables object type
7243 * @obj_type: object type
7245 * Unregisters the object type for use with nf_tables.
7247 void nft_unregister_obj(struct nft_object_type *obj_type)
7249 nfnl_lock(NFNL_SUBSYS_NFTABLES);
7250 list_del_rcu(&obj_type->list);
7251 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7253 EXPORT_SYMBOL_GPL(nft_unregister_obj);
7255 struct nft_object *nft_obj_lookup(const struct net *net,
7256 const struct nft_table *table,
7257 const struct nlattr *nla, u32 objtype,
7260 struct nft_object_hash_key k = { .table = table };
7261 char search[NFT_OBJ_MAXNAMELEN];
7262 struct rhlist_head *tmp, *list;
7263 struct nft_object *obj;
7265 nla_strscpy(search, nla, sizeof(search));
7268 WARN_ON_ONCE(!rcu_read_lock_held() &&
7269 !lockdep_commit_lock_is_held(net));
7272 list = rhltable_lookup(&nft_objname_ht, &k, nft_objname_ht_params);
7276 rhl_for_each_entry_rcu(obj, tmp, list, rhlhead) {
7277 if (objtype == obj->ops->type->type &&
7278 nft_active_genmask(obj, genmask)) {
7285 return ERR_PTR(-ENOENT);
7287 EXPORT_SYMBOL_GPL(nft_obj_lookup);
7289 static struct nft_object *nft_obj_lookup_byhandle(const struct nft_table *table,
7290 const struct nlattr *nla,
7291 u32 objtype, u8 genmask)
7293 struct nft_object *obj;
7295 list_for_each_entry(obj, &table->objects, list) {
7296 if (be64_to_cpu(nla_get_be64(nla)) == obj->handle &&
7297 objtype == obj->ops->type->type &&
7298 nft_active_genmask(obj, genmask))
7301 return ERR_PTR(-ENOENT);
7304 static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
7305 [NFTA_OBJ_TABLE] = { .type = NLA_STRING,
7306 .len = NFT_TABLE_MAXNAMELEN - 1 },
7307 [NFTA_OBJ_NAME] = { .type = NLA_STRING,
7308 .len = NFT_OBJ_MAXNAMELEN - 1 },
7309 [NFTA_OBJ_TYPE] = { .type = NLA_U32 },
7310 [NFTA_OBJ_DATA] = { .type = NLA_NESTED },
7311 [NFTA_OBJ_HANDLE] = { .type = NLA_U64},
7312 [NFTA_OBJ_USERDATA] = { .type = NLA_BINARY,
7313 .len = NFT_USERDATA_MAXLEN },
7316 static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,
7317 const struct nft_object_type *type,
7318 const struct nlattr *attr)
7321 const struct nft_object_ops *ops;
7322 struct nft_object *obj;
7325 tb = kmalloc_array(type->maxattr + 1, sizeof(*tb), GFP_KERNEL);
7330 err = nla_parse_nested_deprecated(tb, type->maxattr, attr,
7331 type->policy, NULL);
7335 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
7338 if (type->select_ops) {
7339 ops = type->select_ops(ctx, (const struct nlattr * const *)tb);
7349 obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL_ACCOUNT);
7353 err = ops->init(ctx, (const struct nlattr * const *)tb, obj);
7366 return ERR_PTR(err);
7369 static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
7370 struct nft_object *obj, bool reset)
7372 struct nlattr *nest;
7374 nest = nla_nest_start_noflag(skb, attr);
7376 goto nla_put_failure;
7377 if (obj->ops->dump(skb, obj, reset) < 0)
7378 goto nla_put_failure;
7379 nla_nest_end(skb, nest);
7386 static const struct nft_object_type *__nft_obj_type_get(u32 objtype)
7388 const struct nft_object_type *type;
7390 list_for_each_entry(type, &nf_tables_objects, list) {
7391 if (objtype == type->type)
7397 static const struct nft_object_type *
7398 nft_obj_type_get(struct net *net, u32 objtype)
7400 const struct nft_object_type *type;
7402 type = __nft_obj_type_get(objtype);
7403 if (type != NULL && try_module_get(type->owner))
7406 lockdep_nfnl_nft_mutex_not_held();
7407 #ifdef CONFIG_MODULES
7409 if (nft_request_module(net, "nft-obj-%u", objtype) == -EAGAIN)
7410 return ERR_PTR(-EAGAIN);
7413 return ERR_PTR(-ENOENT);
7416 static int nf_tables_updobj(const struct nft_ctx *ctx,
7417 const struct nft_object_type *type,
7418 const struct nlattr *attr,
7419 struct nft_object *obj)
7421 struct nft_object *newobj;
7422 struct nft_trans *trans;
7425 if (!try_module_get(type->owner))
7428 trans = nft_trans_alloc(ctx, NFT_MSG_NEWOBJ,
7429 sizeof(struct nft_trans_obj));
7433 newobj = nft_obj_init(ctx, type, attr);
7434 if (IS_ERR(newobj)) {
7435 err = PTR_ERR(newobj);
7436 goto err_free_trans;
7439 nft_trans_obj(trans) = obj;
7440 nft_trans_obj_update(trans) = true;
7441 nft_trans_obj_newobj(trans) = newobj;
7442 nft_trans_commit_list_add_tail(ctx->net, trans);
7449 module_put(type->owner);
7453 static int nf_tables_newobj(struct sk_buff *skb, const struct nfnl_info *info,
7454 const struct nlattr * const nla[])
7456 struct netlink_ext_ack *extack = info->extack;
7457 u8 genmask = nft_genmask_next(info->net);
7458 u8 family = info->nfmsg->nfgen_family;
7459 const struct nft_object_type *type;
7460 struct net *net = info->net;
7461 struct nft_table *table;
7462 struct nft_object *obj;
7467 if (!nla[NFTA_OBJ_TYPE] ||
7468 !nla[NFTA_OBJ_NAME] ||
7469 !nla[NFTA_OBJ_DATA])
7472 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
7473 NETLINK_CB(skb).portid);
7474 if (IS_ERR(table)) {
7475 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7476 return PTR_ERR(table);
7479 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7480 obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
7483 if (err != -ENOENT) {
7484 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7488 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
7489 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7492 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
7495 type = __nft_obj_type_get(objtype);
7496 if (WARN_ON_ONCE(!type))
7499 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7501 return nf_tables_updobj(&ctx, type, nla[NFTA_OBJ_DATA], obj);
7504 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7506 if (!nft_use_inc(&table->use))
7509 type = nft_obj_type_get(net, objtype);
7511 err = PTR_ERR(type);
7515 obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]);
7520 obj->key.table = table;
7521 obj->handle = nf_tables_alloc_handle(table);
7523 obj->key.name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL_ACCOUNT);
7524 if (!obj->key.name) {
7529 if (nla[NFTA_OBJ_USERDATA]) {
7530 obj->udata = nla_memdup(nla[NFTA_OBJ_USERDATA], GFP_KERNEL_ACCOUNT);
7531 if (obj->udata == NULL)
7534 obj->udlen = nla_len(nla[NFTA_OBJ_USERDATA]);
7537 err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
7541 err = rhltable_insert(&nft_objname_ht, &obj->rhlhead,
7542 nft_objname_ht_params);
7546 list_add_tail_rcu(&obj->list, &table->objects);
7550 /* queued in transaction log */
7551 INIT_LIST_HEAD(&obj->list);
7556 kfree(obj->key.name);
7558 if (obj->ops->destroy)
7559 obj->ops->destroy(&ctx, obj);
7562 module_put(type->owner);
7564 nft_use_dec_restore(&table->use);
7569 static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
7570 u32 portid, u32 seq, int event, u32 flags,
7571 int family, const struct nft_table *table,
7572 struct nft_object *obj, bool reset)
7574 struct nlmsghdr *nlh;
7576 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
7577 nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
7578 NFNETLINK_V0, nft_base_seq(net));
7580 goto nla_put_failure;
7582 if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
7583 nla_put_string(skb, NFTA_OBJ_NAME, obj->key.name) ||
7584 nla_put_be64(skb, NFTA_OBJ_HANDLE, cpu_to_be64(obj->handle),
7586 goto nla_put_failure;
7588 if (event == NFT_MSG_DELOBJ) {
7589 nlmsg_end(skb, nlh);
7593 if (nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) ||
7594 nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
7595 nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset))
7596 goto nla_put_failure;
7599 nla_put(skb, NFTA_OBJ_USERDATA, obj->udlen, obj->udata))
7600 goto nla_put_failure;
7602 nlmsg_end(skb, nlh);
7606 nlmsg_trim(skb, nlh);
7610 static void audit_log_obj_reset(const struct nft_table *table,
7611 unsigned int base_seq, unsigned int nentries)
7613 char *buf = kasprintf(GFP_ATOMIC, "%s:%u", table->name, base_seq);
7615 audit_log_nfcfg(buf, table->family, nentries,
7616 AUDIT_NFT_OP_OBJ_RESET, GFP_ATOMIC);
7620 struct nft_obj_filter {
7625 static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
7627 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
7628 const struct nft_table *table;
7629 unsigned int idx = 0, s_idx = cb->args[0];
7630 struct nft_obj_filter *filter = cb->data;
7631 struct net *net = sock_net(skb->sk);
7632 int family = nfmsg->nfgen_family;
7633 struct nftables_pernet *nft_net;
7634 unsigned int entries = 0;
7635 struct nft_object *obj;
7639 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
7643 nft_net = nft_pernet(net);
7644 cb->seq = READ_ONCE(nft_net->base_seq);
7646 list_for_each_entry_rcu(table, &nft_net->tables, list) {
7647 if (family != NFPROTO_UNSPEC && family != table->family)
7651 list_for_each_entry_rcu(obj, &table->objects, list) {
7652 if (!nft_is_active(net, obj))
7657 memset(&cb->args[1], 0,
7658 sizeof(cb->args) - sizeof(cb->args[0]));
7659 if (filter && filter->table &&
7660 strcmp(filter->table, table->name))
7663 filter->type != NFT_OBJECT_UNSPEC &&
7664 obj->ops->type->type != filter->type)
7667 rc = nf_tables_fill_obj_info(skb, net,
7668 NETLINK_CB(cb->skb).portid,
7671 NLM_F_MULTI | NLM_F_APPEND,
7672 table->family, table,
7678 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7682 if (reset && entries)
7683 audit_log_obj_reset(table, nft_net->base_seq, entries);
7693 static int nf_tables_dump_obj_start(struct netlink_callback *cb)
7695 const struct nlattr * const *nla = cb->data;
7696 struct nft_obj_filter *filter = NULL;
7698 if (nla[NFTA_OBJ_TABLE] || nla[NFTA_OBJ_TYPE]) {
7699 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
7703 if (nla[NFTA_OBJ_TABLE]) {
7704 filter->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_ATOMIC);
7705 if (!filter->table) {
7711 if (nla[NFTA_OBJ_TYPE])
7712 filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7719 static int nf_tables_dump_obj_done(struct netlink_callback *cb)
7721 struct nft_obj_filter *filter = cb->data;
7724 kfree(filter->table);
7731 /* called with rcu_read_lock held */
7732 static int nf_tables_getobj(struct sk_buff *skb, const struct nfnl_info *info,
7733 const struct nlattr * const nla[])
7735 struct netlink_ext_ack *extack = info->extack;
7736 u8 genmask = nft_genmask_cur(info->net);
7737 u8 family = info->nfmsg->nfgen_family;
7738 const struct nft_table *table;
7739 struct net *net = info->net;
7740 struct nft_object *obj;
7741 struct sk_buff *skb2;
7746 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
7747 struct netlink_dump_control c = {
7748 .start = nf_tables_dump_obj_start,
7749 .dump = nf_tables_dump_obj,
7750 .done = nf_tables_dump_obj_done,
7751 .module = THIS_MODULE,
7752 .data = (void *)nla,
7755 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
7758 if (!nla[NFTA_OBJ_NAME] ||
7759 !nla[NFTA_OBJ_TYPE])
7762 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask, 0);
7763 if (IS_ERR(table)) {
7764 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7765 return PTR_ERR(table);
7768 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7769 obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
7771 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7772 return PTR_ERR(obj);
7775 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
7779 if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
7783 const struct nftables_pernet *nft_net;
7786 nft_net = nft_pernet(net);
7787 buf = kasprintf(GFP_ATOMIC, "%s:%u", table->name, nft_net->base_seq);
7789 audit_log_nfcfg(buf,
7792 AUDIT_NFT_OP_OBJ_RESET,
7797 err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
7798 info->nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
7799 family, table, obj, reset);
7801 goto err_fill_obj_info;
7803 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
7810 static void nft_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj)
7812 if (obj->ops->destroy)
7813 obj->ops->destroy(ctx, obj);
7815 module_put(obj->ops->type->owner);
7816 kfree(obj->key.name);
7821 static int nf_tables_delobj(struct sk_buff *skb, const struct nfnl_info *info,
7822 const struct nlattr * const nla[])
7824 struct netlink_ext_ack *extack = info->extack;
7825 u8 genmask = nft_genmask_next(info->net);
7826 u8 family = info->nfmsg->nfgen_family;
7827 struct net *net = info->net;
7828 const struct nlattr *attr;
7829 struct nft_table *table;
7830 struct nft_object *obj;
7834 if (!nla[NFTA_OBJ_TYPE] ||
7835 (!nla[NFTA_OBJ_NAME] && !nla[NFTA_OBJ_HANDLE]))
7838 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
7839 NETLINK_CB(skb).portid);
7840 if (IS_ERR(table)) {
7841 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7842 return PTR_ERR(table);
7845 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7846 if (nla[NFTA_OBJ_HANDLE]) {
7847 attr = nla[NFTA_OBJ_HANDLE];
7848 obj = nft_obj_lookup_byhandle(table, attr, objtype, genmask);
7850 attr = nla[NFTA_OBJ_NAME];
7851 obj = nft_obj_lookup(net, table, attr, objtype, genmask);
7855 if (PTR_ERR(obj) == -ENOENT &&
7856 NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYOBJ)
7859 NL_SET_BAD_ATTR(extack, attr);
7860 return PTR_ERR(obj);
7863 NL_SET_BAD_ATTR(extack, attr);
7867 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7869 return nft_delobj(&ctx, obj);
7873 __nft_obj_notify(struct net *net, const struct nft_table *table,
7874 struct nft_object *obj, u32 portid, u32 seq, int event,
7875 u16 flags, int family, int report, gfp_t gfp)
7877 struct nftables_pernet *nft_net = nft_pernet(net);
7878 struct sk_buff *skb;
7882 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
7885 skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
7889 err = nf_tables_fill_obj_info(skb, net, portid, seq, event,
7890 flags & (NLM_F_CREATE | NLM_F_EXCL),
7891 family, table, obj, false);
7897 nft_notify_enqueue(skb, report, &nft_net->notify_list);
7900 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
7903 void nft_obj_notify(struct net *net, const struct nft_table *table,
7904 struct nft_object *obj, u32 portid, u32 seq, int event,
7905 u16 flags, int family, int report, gfp_t gfp)
7907 struct nftables_pernet *nft_net = nft_pernet(net);
7908 char *buf = kasprintf(gfp, "%s:%u",
7909 table->name, nft_net->base_seq);
7911 audit_log_nfcfg(buf,
7914 event == NFT_MSG_NEWOBJ ?
7915 AUDIT_NFT_OP_OBJ_REGISTER :
7916 AUDIT_NFT_OP_OBJ_UNREGISTER,
7920 __nft_obj_notify(net, table, obj, portid, seq, event,
7921 flags, family, report, gfp);
7923 EXPORT_SYMBOL_GPL(nft_obj_notify);
7925 static void nf_tables_obj_notify(const struct nft_ctx *ctx,
7926 struct nft_object *obj, int event)
7928 __nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid,
7929 ctx->seq, event, ctx->flags, ctx->family,
7930 ctx->report, GFP_KERNEL);
7936 void nft_register_flowtable_type(struct nf_flowtable_type *type)
7938 nfnl_lock(NFNL_SUBSYS_NFTABLES);
7939 list_add_tail_rcu(&type->list, &nf_tables_flowtables);
7940 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7942 EXPORT_SYMBOL_GPL(nft_register_flowtable_type);
7944 void nft_unregister_flowtable_type(struct nf_flowtable_type *type)
7946 nfnl_lock(NFNL_SUBSYS_NFTABLES);
7947 list_del_rcu(&type->list);
7948 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7950 EXPORT_SYMBOL_GPL(nft_unregister_flowtable_type);
7952 static const struct nla_policy nft_flowtable_policy[NFTA_FLOWTABLE_MAX + 1] = {
7953 [NFTA_FLOWTABLE_TABLE] = { .type = NLA_STRING,
7954 .len = NFT_NAME_MAXLEN - 1 },
7955 [NFTA_FLOWTABLE_NAME] = { .type = NLA_STRING,
7956 .len = NFT_NAME_MAXLEN - 1 },
7957 [NFTA_FLOWTABLE_HOOK] = { .type = NLA_NESTED },
7958 [NFTA_FLOWTABLE_HANDLE] = { .type = NLA_U64 },
7959 [NFTA_FLOWTABLE_FLAGS] = { .type = NLA_U32 },
7962 struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table,
7963 const struct nlattr *nla, u8 genmask)
7965 struct nft_flowtable *flowtable;
7967 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
7968 if (!nla_strcmp(nla, flowtable->name) &&
7969 nft_active_genmask(flowtable, genmask))
7972 return ERR_PTR(-ENOENT);
7974 EXPORT_SYMBOL_GPL(nft_flowtable_lookup);
7976 void nf_tables_deactivate_flowtable(const struct nft_ctx *ctx,
7977 struct nft_flowtable *flowtable,
7978 enum nft_trans_phase phase)
7981 case NFT_TRANS_PREPARE_ERROR:
7982 case NFT_TRANS_PREPARE:
7983 case NFT_TRANS_ABORT:
7984 case NFT_TRANS_RELEASE:
7985 nft_use_dec(&flowtable->use);
7991 EXPORT_SYMBOL_GPL(nf_tables_deactivate_flowtable);
7993 static struct nft_flowtable *
7994 nft_flowtable_lookup_byhandle(const struct nft_table *table,
7995 const struct nlattr *nla, u8 genmask)
7997 struct nft_flowtable *flowtable;
7999 list_for_each_entry(flowtable, &table->flowtables, list) {
8000 if (be64_to_cpu(nla_get_be64(nla)) == flowtable->handle &&
8001 nft_active_genmask(flowtable, genmask))
8004 return ERR_PTR(-ENOENT);
8007 struct nft_flowtable_hook {
8010 struct list_head list;
8013 static const struct nla_policy nft_flowtable_hook_policy[NFTA_FLOWTABLE_HOOK_MAX + 1] = {
8014 [NFTA_FLOWTABLE_HOOK_NUM] = { .type = NLA_U32 },
8015 [NFTA_FLOWTABLE_HOOK_PRIORITY] = { .type = NLA_U32 },
8016 [NFTA_FLOWTABLE_HOOK_DEVS] = { .type = NLA_NESTED },
8019 static int nft_flowtable_parse_hook(const struct nft_ctx *ctx,
8020 const struct nlattr * const nla[],
8021 struct nft_flowtable_hook *flowtable_hook,
8022 struct nft_flowtable *flowtable,
8023 struct netlink_ext_ack *extack, bool add)
8025 struct nlattr *tb[NFTA_FLOWTABLE_HOOK_MAX + 1];
8026 struct nft_hook *hook;
8027 int hooknum, priority;
8030 INIT_LIST_HEAD(&flowtable_hook->list);
8032 err = nla_parse_nested_deprecated(tb, NFTA_FLOWTABLE_HOOK_MAX,
8033 nla[NFTA_FLOWTABLE_HOOK],
8034 nft_flowtable_hook_policy, NULL);
8039 if (!tb[NFTA_FLOWTABLE_HOOK_NUM] ||
8040 !tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) {
8041 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
8045 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
8046 if (hooknum != NF_NETDEV_INGRESS)
8049 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
8051 flowtable_hook->priority = priority;
8052 flowtable_hook->num = hooknum;
8054 if (tb[NFTA_FLOWTABLE_HOOK_NUM]) {
8055 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
8056 if (hooknum != flowtable->hooknum)
8060 if (tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) {
8061 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
8062 if (priority != flowtable->data.priority)
8066 flowtable_hook->priority = flowtable->data.priority;
8067 flowtable_hook->num = flowtable->hooknum;
8070 if (tb[NFTA_FLOWTABLE_HOOK_DEVS]) {
8071 err = nf_tables_parse_netdev_hooks(ctx->net,
8072 tb[NFTA_FLOWTABLE_HOOK_DEVS],
8073 &flowtable_hook->list,
8079 list_for_each_entry(hook, &flowtable_hook->list, list) {
8080 hook->ops.pf = NFPROTO_NETDEV;
8081 hook->ops.hooknum = flowtable_hook->num;
8082 hook->ops.priority = flowtable_hook->priority;
8083 hook->ops.priv = &flowtable->data;
8084 hook->ops.hook = flowtable->data.type->hook;
8090 static const struct nf_flowtable_type *__nft_flowtable_type_get(u8 family)
8092 const struct nf_flowtable_type *type;
8094 list_for_each_entry(type, &nf_tables_flowtables, list) {
8095 if (family == type->family)
8101 static const struct nf_flowtable_type *
8102 nft_flowtable_type_get(struct net *net, u8 family)
8104 const struct nf_flowtable_type *type;
8106 type = __nft_flowtable_type_get(family);
8107 if (type != NULL && try_module_get(type->owner))
8110 lockdep_nfnl_nft_mutex_not_held();
8111 #ifdef CONFIG_MODULES
8113 if (nft_request_module(net, "nf-flowtable-%u", family) == -EAGAIN)
8114 return ERR_PTR(-EAGAIN);
8117 return ERR_PTR(-ENOENT);
8120 /* Only called from error and netdev event paths. */
8121 static void nft_unregister_flowtable_hook(struct net *net,
8122 struct nft_flowtable *flowtable,
8123 struct nft_hook *hook)
8125 nf_unregister_net_hook(net, &hook->ops);
8126 flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
8130 static void __nft_unregister_flowtable_net_hooks(struct net *net,
8131 struct list_head *hook_list,
8132 bool release_netdev)
8134 struct nft_hook *hook, *next;
8136 list_for_each_entry_safe(hook, next, hook_list, list) {
8137 nf_unregister_net_hook(net, &hook->ops);
8138 if (release_netdev) {
8139 list_del(&hook->list);
8140 kfree_rcu(hook, rcu);
8145 static void nft_unregister_flowtable_net_hooks(struct net *net,
8146 struct list_head *hook_list)
8148 __nft_unregister_flowtable_net_hooks(net, hook_list, false);
8151 static int nft_register_flowtable_net_hooks(struct net *net,
8152 struct nft_table *table,
8153 struct list_head *hook_list,
8154 struct nft_flowtable *flowtable)
8156 struct nft_hook *hook, *hook2, *next;
8157 struct nft_flowtable *ft;
8160 list_for_each_entry(hook, hook_list, list) {
8161 list_for_each_entry(ft, &table->flowtables, list) {
8162 if (!nft_is_active_next(net, ft))
8165 list_for_each_entry(hook2, &ft->hook_list, list) {
8166 if (hook->ops.dev == hook2->ops.dev &&
8167 hook->ops.pf == hook2->ops.pf) {
8169 goto err_unregister_net_hooks;
8174 err = flowtable->data.type->setup(&flowtable->data,
8178 goto err_unregister_net_hooks;
8180 err = nf_register_net_hook(net, &hook->ops);
8182 flowtable->data.type->setup(&flowtable->data,
8185 goto err_unregister_net_hooks;
8193 err_unregister_net_hooks:
8194 list_for_each_entry_safe(hook, next, hook_list, list) {
8198 nft_unregister_flowtable_hook(net, flowtable, hook);
8199 list_del_rcu(&hook->list);
8200 kfree_rcu(hook, rcu);
8206 static void nft_hooks_destroy(struct list_head *hook_list)
8208 struct nft_hook *hook, *next;
8210 list_for_each_entry_safe(hook, next, hook_list, list) {
8211 list_del_rcu(&hook->list);
8212 kfree_rcu(hook, rcu);
8216 static int nft_flowtable_update(struct nft_ctx *ctx, const struct nlmsghdr *nlh,
8217 struct nft_flowtable *flowtable,
8218 struct netlink_ext_ack *extack)
8220 const struct nlattr * const *nla = ctx->nla;
8221 struct nft_flowtable_hook flowtable_hook;
8222 struct nft_hook *hook, *next;
8223 struct nft_trans *trans;
8224 bool unregister = false;
8228 err = nft_flowtable_parse_hook(ctx, nla, &flowtable_hook, flowtable,
8233 list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
8234 if (nft_hook_list_find(&flowtable->hook_list, hook)) {
8235 list_del(&hook->list);
8240 if (nla[NFTA_FLOWTABLE_FLAGS]) {
8241 flags = ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
8242 if (flags & ~NFT_FLOWTABLE_MASK) {
8244 goto err_flowtable_update_hook;
8246 if ((flowtable->data.flags & NFT_FLOWTABLE_HW_OFFLOAD) ^
8247 (flags & NFT_FLOWTABLE_HW_OFFLOAD)) {
8249 goto err_flowtable_update_hook;
8252 flags = flowtable->data.flags;
8255 err = nft_register_flowtable_net_hooks(ctx->net, ctx->table,
8256 &flowtable_hook.list, flowtable);
8258 goto err_flowtable_update_hook;
8260 trans = nft_trans_alloc(ctx, NFT_MSG_NEWFLOWTABLE,
8261 sizeof(struct nft_trans_flowtable));
8265 goto err_flowtable_update_hook;
8268 nft_trans_flowtable_flags(trans) = flags;
8269 nft_trans_flowtable(trans) = flowtable;
8270 nft_trans_flowtable_update(trans) = true;
8271 INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
8272 list_splice(&flowtable_hook.list, &nft_trans_flowtable_hooks(trans));
8274 nft_trans_commit_list_add_tail(ctx->net, trans);
8278 err_flowtable_update_hook:
8279 list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
8281 nft_unregister_flowtable_hook(ctx->net, flowtable, hook);
8282 list_del_rcu(&hook->list);
8283 kfree_rcu(hook, rcu);
8290 static int nf_tables_newflowtable(struct sk_buff *skb,
8291 const struct nfnl_info *info,
8292 const struct nlattr * const nla[])
8294 struct netlink_ext_ack *extack = info->extack;
8295 struct nft_flowtable_hook flowtable_hook;
8296 u8 genmask = nft_genmask_next(info->net);
8297 u8 family = info->nfmsg->nfgen_family;
8298 const struct nf_flowtable_type *type;
8299 struct nft_flowtable *flowtable;
8300 struct nft_hook *hook, *next;
8301 struct net *net = info->net;
8302 struct nft_table *table;
8306 if (!nla[NFTA_FLOWTABLE_TABLE] ||
8307 !nla[NFTA_FLOWTABLE_NAME] ||
8308 !nla[NFTA_FLOWTABLE_HOOK])
8311 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
8312 genmask, NETLINK_CB(skb).portid);
8313 if (IS_ERR(table)) {
8314 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
8315 return PTR_ERR(table);
8318 flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
8320 if (IS_ERR(flowtable)) {
8321 err = PTR_ERR(flowtable);
8322 if (err != -ENOENT) {
8323 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
8327 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
8328 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
8332 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
8334 return nft_flowtable_update(&ctx, info->nlh, flowtable, extack);
8337 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
8339 if (!nft_use_inc(&table->use))
8342 flowtable = kzalloc(sizeof(*flowtable), GFP_KERNEL_ACCOUNT);
8345 goto flowtable_alloc;
8348 flowtable->table = table;
8349 flowtable->handle = nf_tables_alloc_handle(table);
8350 INIT_LIST_HEAD(&flowtable->hook_list);
8352 flowtable->name = nla_strdup(nla[NFTA_FLOWTABLE_NAME], GFP_KERNEL_ACCOUNT);
8353 if (!flowtable->name) {
8358 type = nft_flowtable_type_get(net, family);
8360 err = PTR_ERR(type);
8364 if (nla[NFTA_FLOWTABLE_FLAGS]) {
8365 flowtable->data.flags =
8366 ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
8367 if (flowtable->data.flags & ~NFT_FLOWTABLE_MASK) {
8373 write_pnet(&flowtable->data.net, net);
8374 flowtable->data.type = type;
8375 err = type->init(&flowtable->data);
8379 err = nft_flowtable_parse_hook(&ctx, nla, &flowtable_hook, flowtable,
8384 list_splice(&flowtable_hook.list, &flowtable->hook_list);
8385 flowtable->data.priority = flowtable_hook.priority;
8386 flowtable->hooknum = flowtable_hook.num;
8388 err = nft_register_flowtable_net_hooks(ctx.net, table,
8389 &flowtable->hook_list,
8392 nft_hooks_destroy(&flowtable->hook_list);
8396 err = nft_trans_flowtable_add(&ctx, NFT_MSG_NEWFLOWTABLE, flowtable);
8400 list_add_tail_rcu(&flowtable->list, &table->flowtables);
8404 list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
8405 nft_unregister_flowtable_hook(net, flowtable, hook);
8406 list_del_rcu(&hook->list);
8407 kfree_rcu(hook, rcu);
8410 flowtable->data.type->free(&flowtable->data);
8412 module_put(type->owner);
8414 kfree(flowtable->name);
8418 nft_use_dec_restore(&table->use);
8423 static void nft_flowtable_hook_release(struct nft_flowtable_hook *flowtable_hook)
8425 struct nft_hook *this, *next;
8427 list_for_each_entry_safe(this, next, &flowtable_hook->list, list) {
8428 list_del(&this->list);
8433 static int nft_delflowtable_hook(struct nft_ctx *ctx,
8434 struct nft_flowtable *flowtable,
8435 struct netlink_ext_ack *extack)
8437 const struct nlattr * const *nla = ctx->nla;
8438 struct nft_flowtable_hook flowtable_hook;
8439 LIST_HEAD(flowtable_del_list);
8440 struct nft_hook *this, *hook;
8441 struct nft_trans *trans;
8444 err = nft_flowtable_parse_hook(ctx, nla, &flowtable_hook, flowtable,
8449 list_for_each_entry(this, &flowtable_hook.list, list) {
8450 hook = nft_hook_list_find(&flowtable->hook_list, this);
8453 goto err_flowtable_del_hook;
8455 list_move(&hook->list, &flowtable_del_list);
8458 trans = nft_trans_alloc(ctx, NFT_MSG_DELFLOWTABLE,
8459 sizeof(struct nft_trans_flowtable));
8462 goto err_flowtable_del_hook;
8465 nft_trans_flowtable(trans) = flowtable;
8466 nft_trans_flowtable_update(trans) = true;
8467 INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
8468 list_splice(&flowtable_del_list, &nft_trans_flowtable_hooks(trans));
8469 nft_flowtable_hook_release(&flowtable_hook);
8471 nft_trans_commit_list_add_tail(ctx->net, trans);
8475 err_flowtable_del_hook:
8476 list_splice(&flowtable_del_list, &flowtable->hook_list);
8477 nft_flowtable_hook_release(&flowtable_hook);
8482 static int nf_tables_delflowtable(struct sk_buff *skb,
8483 const struct nfnl_info *info,
8484 const struct nlattr * const nla[])
8486 struct netlink_ext_ack *extack = info->extack;
8487 u8 genmask = nft_genmask_next(info->net);
8488 u8 family = info->nfmsg->nfgen_family;
8489 struct nft_flowtable *flowtable;
8490 struct net *net = info->net;
8491 const struct nlattr *attr;
8492 struct nft_table *table;
8495 if (!nla[NFTA_FLOWTABLE_TABLE] ||
8496 (!nla[NFTA_FLOWTABLE_NAME] &&
8497 !nla[NFTA_FLOWTABLE_HANDLE]))
8500 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
8501 genmask, NETLINK_CB(skb).portid);
8502 if (IS_ERR(table)) {
8503 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
8504 return PTR_ERR(table);
8507 if (nla[NFTA_FLOWTABLE_HANDLE]) {
8508 attr = nla[NFTA_FLOWTABLE_HANDLE];
8509 flowtable = nft_flowtable_lookup_byhandle(table, attr, genmask);
8511 attr = nla[NFTA_FLOWTABLE_NAME];
8512 flowtable = nft_flowtable_lookup(table, attr, genmask);
8515 if (IS_ERR(flowtable)) {
8516 if (PTR_ERR(flowtable) == -ENOENT &&
8517 NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYFLOWTABLE)
8520 NL_SET_BAD_ATTR(extack, attr);
8521 return PTR_ERR(flowtable);
8524 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
8526 if (nla[NFTA_FLOWTABLE_HOOK])
8527 return nft_delflowtable_hook(&ctx, flowtable, extack);
8529 if (flowtable->use > 0) {
8530 NL_SET_BAD_ATTR(extack, attr);
8534 return nft_delflowtable(&ctx, flowtable);
8537 static int nf_tables_fill_flowtable_info(struct sk_buff *skb, struct net *net,
8538 u32 portid, u32 seq, int event,
8539 u32 flags, int family,
8540 struct nft_flowtable *flowtable,
8541 struct list_head *hook_list)
8543 struct nlattr *nest, *nest_devs;
8544 struct nft_hook *hook;
8545 struct nlmsghdr *nlh;
8547 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
8548 nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
8549 NFNETLINK_V0, nft_base_seq(net));
8551 goto nla_put_failure;
8553 if (nla_put_string(skb, NFTA_FLOWTABLE_TABLE, flowtable->table->name) ||
8554 nla_put_string(skb, NFTA_FLOWTABLE_NAME, flowtable->name) ||
8555 nla_put_be64(skb, NFTA_FLOWTABLE_HANDLE, cpu_to_be64(flowtable->handle),
8556 NFTA_FLOWTABLE_PAD))
8557 goto nla_put_failure;
8559 if (event == NFT_MSG_DELFLOWTABLE && !hook_list) {
8560 nlmsg_end(skb, nlh);
8564 if (nla_put_be32(skb, NFTA_FLOWTABLE_USE, htonl(flowtable->use)) ||
8565 nla_put_be32(skb, NFTA_FLOWTABLE_FLAGS, htonl(flowtable->data.flags)))
8566 goto nla_put_failure;
8568 nest = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK);
8570 goto nla_put_failure;
8571 if (nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_NUM, htonl(flowtable->hooknum)) ||
8572 nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_PRIORITY, htonl(flowtable->data.priority)))
8573 goto nla_put_failure;
8575 nest_devs = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK_DEVS);
8577 goto nla_put_failure;
8580 hook_list = &flowtable->hook_list;
8582 list_for_each_entry_rcu(hook, hook_list, list) {
8583 if (nla_put_string(skb, NFTA_DEVICE_NAME, hook->ops.dev->name))
8584 goto nla_put_failure;
8586 nla_nest_end(skb, nest_devs);
8587 nla_nest_end(skb, nest);
8589 nlmsg_end(skb, nlh);
8593 nlmsg_trim(skb, nlh);
8597 struct nft_flowtable_filter {
8601 static int nf_tables_dump_flowtable(struct sk_buff *skb,
8602 struct netlink_callback *cb)
8604 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
8605 struct nft_flowtable_filter *filter = cb->data;
8606 unsigned int idx = 0, s_idx = cb->args[0];
8607 struct net *net = sock_net(skb->sk);
8608 int family = nfmsg->nfgen_family;
8609 struct nft_flowtable *flowtable;
8610 struct nftables_pernet *nft_net;
8611 const struct nft_table *table;
8614 nft_net = nft_pernet(net);
8615 cb->seq = READ_ONCE(nft_net->base_seq);
8617 list_for_each_entry_rcu(table, &nft_net->tables, list) {
8618 if (family != NFPROTO_UNSPEC && family != table->family)
8621 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
8622 if (!nft_is_active(net, flowtable))
8627 memset(&cb->args[1], 0,
8628 sizeof(cb->args) - sizeof(cb->args[0]));
8629 if (filter && filter->table &&
8630 strcmp(filter->table, table->name))
8633 if (nf_tables_fill_flowtable_info(skb, net, NETLINK_CB(cb->skb).portid,
8635 NFT_MSG_NEWFLOWTABLE,
8636 NLM_F_MULTI | NLM_F_APPEND,
8638 flowtable, NULL) < 0)
8641 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
8653 static int nf_tables_dump_flowtable_start(struct netlink_callback *cb)
8655 const struct nlattr * const *nla = cb->data;
8656 struct nft_flowtable_filter *filter = NULL;
8658 if (nla[NFTA_FLOWTABLE_TABLE]) {
8659 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
8663 filter->table = nla_strdup(nla[NFTA_FLOWTABLE_TABLE],
8665 if (!filter->table) {
8675 static int nf_tables_dump_flowtable_done(struct netlink_callback *cb)
8677 struct nft_flowtable_filter *filter = cb->data;
8682 kfree(filter->table);
8688 /* called with rcu_read_lock held */
8689 static int nf_tables_getflowtable(struct sk_buff *skb,
8690 const struct nfnl_info *info,
8691 const struct nlattr * const nla[])
8693 u8 genmask = nft_genmask_cur(info->net);
8694 u8 family = info->nfmsg->nfgen_family;
8695 struct nft_flowtable *flowtable;
8696 const struct nft_table *table;
8697 struct net *net = info->net;
8698 struct sk_buff *skb2;
8701 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
8702 struct netlink_dump_control c = {
8703 .start = nf_tables_dump_flowtable_start,
8704 .dump = nf_tables_dump_flowtable,
8705 .done = nf_tables_dump_flowtable_done,
8706 .module = THIS_MODULE,
8707 .data = (void *)nla,
8710 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
8713 if (!nla[NFTA_FLOWTABLE_NAME])
8716 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
8719 return PTR_ERR(table);
8721 flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
8723 if (IS_ERR(flowtable))
8724 return PTR_ERR(flowtable);
8726 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
8730 err = nf_tables_fill_flowtable_info(skb2, net, NETLINK_CB(skb).portid,
8731 info->nlh->nlmsg_seq,
8732 NFT_MSG_NEWFLOWTABLE, 0, family,
8735 goto err_fill_flowtable_info;
8737 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
8739 err_fill_flowtable_info:
8744 static void nf_tables_flowtable_notify(struct nft_ctx *ctx,
8745 struct nft_flowtable *flowtable,
8746 struct list_head *hook_list, int event)
8748 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
8749 struct sk_buff *skb;
8754 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
8757 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
8761 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
8762 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
8764 err = nf_tables_fill_flowtable_info(skb, ctx->net, ctx->portid,
8765 ctx->seq, event, flags,
8766 ctx->family, flowtable, hook_list);
8772 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
8775 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
8778 static void nf_tables_flowtable_destroy(struct nft_flowtable *flowtable)
8780 struct nft_hook *hook, *next;
8782 flowtable->data.type->free(&flowtable->data);
8783 list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
8784 flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
8786 list_del_rcu(&hook->list);
8789 kfree(flowtable->name);
8790 module_put(flowtable->data.type->owner);
8794 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
8795 u32 portid, u32 seq)
8797 struct nftables_pernet *nft_net = nft_pernet(net);
8798 struct nlmsghdr *nlh;
8799 char buf[TASK_COMM_LEN];
8800 int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN);
8802 nlh = nfnl_msg_put(skb, portid, seq, event, 0, AF_UNSPEC,
8803 NFNETLINK_V0, nft_base_seq(net));
8805 goto nla_put_failure;
8807 if (nla_put_be32(skb, NFTA_GEN_ID, htonl(nft_net->base_seq)) ||
8808 nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) ||
8809 nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current)))
8810 goto nla_put_failure;
8812 nlmsg_end(skb, nlh);
8816 nlmsg_trim(skb, nlh);
8820 static void nft_flowtable_event(unsigned long event, struct net_device *dev,
8821 struct nft_flowtable *flowtable)
8823 struct nft_hook *hook;
8825 list_for_each_entry(hook, &flowtable->hook_list, list) {
8826 if (hook->ops.dev != dev)
8829 /* flow_offload_netdev_event() cleans up entries for us. */
8830 nft_unregister_flowtable_hook(dev_net(dev), flowtable, hook);
8831 list_del_rcu(&hook->list);
8832 kfree_rcu(hook, rcu);
8837 static int nf_tables_flowtable_event(struct notifier_block *this,
8838 unsigned long event, void *ptr)
8840 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
8841 struct nft_flowtable *flowtable;
8842 struct nftables_pernet *nft_net;
8843 struct nft_table *table;
8846 if (event != NETDEV_UNREGISTER)
8850 nft_net = nft_pernet(net);
8851 mutex_lock(&nft_net->commit_mutex);
8852 list_for_each_entry(table, &nft_net->tables, list) {
8853 list_for_each_entry(flowtable, &table->flowtables, list) {
8854 nft_flowtable_event(event, dev, flowtable);
8857 mutex_unlock(&nft_net->commit_mutex);
8862 static struct notifier_block nf_tables_flowtable_notifier = {
8863 .notifier_call = nf_tables_flowtable_event,
8866 static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
8869 struct nlmsghdr *nlh = nlmsg_hdr(skb);
8870 struct sk_buff *skb2;
8873 if (!nlmsg_report(nlh) &&
8874 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
8877 skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
8881 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
8888 nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
8889 nlmsg_report(nlh), GFP_KERNEL);
8892 nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
8896 static int nf_tables_getgen(struct sk_buff *skb, const struct nfnl_info *info,
8897 const struct nlattr * const nla[])
8899 struct sk_buff *skb2;
8902 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
8906 err = nf_tables_fill_gen_info(skb2, info->net, NETLINK_CB(skb).portid,
8907 info->nlh->nlmsg_seq);
8909 goto err_fill_gen_info;
8911 return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid);
8918 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
8919 [NFT_MSG_NEWTABLE] = {
8920 .call = nf_tables_newtable,
8921 .type = NFNL_CB_BATCH,
8922 .attr_count = NFTA_TABLE_MAX,
8923 .policy = nft_table_policy,
8925 [NFT_MSG_GETTABLE] = {
8926 .call = nf_tables_gettable,
8927 .type = NFNL_CB_RCU,
8928 .attr_count = NFTA_TABLE_MAX,
8929 .policy = nft_table_policy,
8931 [NFT_MSG_DELTABLE] = {
8932 .call = nf_tables_deltable,
8933 .type = NFNL_CB_BATCH,
8934 .attr_count = NFTA_TABLE_MAX,
8935 .policy = nft_table_policy,
8937 [NFT_MSG_DESTROYTABLE] = {
8938 .call = nf_tables_deltable,
8939 .type = NFNL_CB_BATCH,
8940 .attr_count = NFTA_TABLE_MAX,
8941 .policy = nft_table_policy,
8943 [NFT_MSG_NEWCHAIN] = {
8944 .call = nf_tables_newchain,
8945 .type = NFNL_CB_BATCH,
8946 .attr_count = NFTA_CHAIN_MAX,
8947 .policy = nft_chain_policy,
8949 [NFT_MSG_GETCHAIN] = {
8950 .call = nf_tables_getchain,
8951 .type = NFNL_CB_RCU,
8952 .attr_count = NFTA_CHAIN_MAX,
8953 .policy = nft_chain_policy,
8955 [NFT_MSG_DELCHAIN] = {
8956 .call = nf_tables_delchain,
8957 .type = NFNL_CB_BATCH,
8958 .attr_count = NFTA_CHAIN_MAX,
8959 .policy = nft_chain_policy,
8961 [NFT_MSG_DESTROYCHAIN] = {
8962 .call = nf_tables_delchain,
8963 .type = NFNL_CB_BATCH,
8964 .attr_count = NFTA_CHAIN_MAX,
8965 .policy = nft_chain_policy,
8967 [NFT_MSG_NEWRULE] = {
8968 .call = nf_tables_newrule,
8969 .type = NFNL_CB_BATCH,
8970 .attr_count = NFTA_RULE_MAX,
8971 .policy = nft_rule_policy,
8973 [NFT_MSG_GETRULE] = {
8974 .call = nf_tables_getrule,
8975 .type = NFNL_CB_RCU,
8976 .attr_count = NFTA_RULE_MAX,
8977 .policy = nft_rule_policy,
8979 [NFT_MSG_GETRULE_RESET] = {
8980 .call = nf_tables_getrule,
8981 .type = NFNL_CB_RCU,
8982 .attr_count = NFTA_RULE_MAX,
8983 .policy = nft_rule_policy,
8985 [NFT_MSG_DELRULE] = {
8986 .call = nf_tables_delrule,
8987 .type = NFNL_CB_BATCH,
8988 .attr_count = NFTA_RULE_MAX,
8989 .policy = nft_rule_policy,
8991 [NFT_MSG_DESTROYRULE] = {
8992 .call = nf_tables_delrule,
8993 .type = NFNL_CB_BATCH,
8994 .attr_count = NFTA_RULE_MAX,
8995 .policy = nft_rule_policy,
8997 [NFT_MSG_NEWSET] = {
8998 .call = nf_tables_newset,
8999 .type = NFNL_CB_BATCH,
9000 .attr_count = NFTA_SET_MAX,
9001 .policy = nft_set_policy,
9003 [NFT_MSG_GETSET] = {
9004 .call = nf_tables_getset,
9005 .type = NFNL_CB_RCU,
9006 .attr_count = NFTA_SET_MAX,
9007 .policy = nft_set_policy,
9009 [NFT_MSG_DELSET] = {
9010 .call = nf_tables_delset,
9011 .type = NFNL_CB_BATCH,
9012 .attr_count = NFTA_SET_MAX,
9013 .policy = nft_set_policy,
9015 [NFT_MSG_DESTROYSET] = {
9016 .call = nf_tables_delset,
9017 .type = NFNL_CB_BATCH,
9018 .attr_count = NFTA_SET_MAX,
9019 .policy = nft_set_policy,
9021 [NFT_MSG_NEWSETELEM] = {
9022 .call = nf_tables_newsetelem,
9023 .type = NFNL_CB_BATCH,
9024 .attr_count = NFTA_SET_ELEM_LIST_MAX,
9025 .policy = nft_set_elem_list_policy,
9027 [NFT_MSG_GETSETELEM] = {
9028 .call = nf_tables_getsetelem,
9029 .type = NFNL_CB_RCU,
9030 .attr_count = NFTA_SET_ELEM_LIST_MAX,
9031 .policy = nft_set_elem_list_policy,
9033 [NFT_MSG_GETSETELEM_RESET] = {
9034 .call = nf_tables_getsetelem,
9035 .type = NFNL_CB_RCU,
9036 .attr_count = NFTA_SET_ELEM_LIST_MAX,
9037 .policy = nft_set_elem_list_policy,
9039 [NFT_MSG_DELSETELEM] = {
9040 .call = nf_tables_delsetelem,
9041 .type = NFNL_CB_BATCH,
9042 .attr_count = NFTA_SET_ELEM_LIST_MAX,
9043 .policy = nft_set_elem_list_policy,
9045 [NFT_MSG_DESTROYSETELEM] = {
9046 .call = nf_tables_delsetelem,
9047 .type = NFNL_CB_BATCH,
9048 .attr_count = NFTA_SET_ELEM_LIST_MAX,
9049 .policy = nft_set_elem_list_policy,
9051 [NFT_MSG_GETGEN] = {
9052 .call = nf_tables_getgen,
9053 .type = NFNL_CB_RCU,
9055 [NFT_MSG_NEWOBJ] = {
9056 .call = nf_tables_newobj,
9057 .type = NFNL_CB_BATCH,
9058 .attr_count = NFTA_OBJ_MAX,
9059 .policy = nft_obj_policy,
9061 [NFT_MSG_GETOBJ] = {
9062 .call = nf_tables_getobj,
9063 .type = NFNL_CB_RCU,
9064 .attr_count = NFTA_OBJ_MAX,
9065 .policy = nft_obj_policy,
9067 [NFT_MSG_DELOBJ] = {
9068 .call = nf_tables_delobj,
9069 .type = NFNL_CB_BATCH,
9070 .attr_count = NFTA_OBJ_MAX,
9071 .policy = nft_obj_policy,
9073 [NFT_MSG_DESTROYOBJ] = {
9074 .call = nf_tables_delobj,
9075 .type = NFNL_CB_BATCH,
9076 .attr_count = NFTA_OBJ_MAX,
9077 .policy = nft_obj_policy,
9079 [NFT_MSG_GETOBJ_RESET] = {
9080 .call = nf_tables_getobj,
9081 .type = NFNL_CB_RCU,
9082 .attr_count = NFTA_OBJ_MAX,
9083 .policy = nft_obj_policy,
9085 [NFT_MSG_NEWFLOWTABLE] = {
9086 .call = nf_tables_newflowtable,
9087 .type = NFNL_CB_BATCH,
9088 .attr_count = NFTA_FLOWTABLE_MAX,
9089 .policy = nft_flowtable_policy,
9091 [NFT_MSG_GETFLOWTABLE] = {
9092 .call = nf_tables_getflowtable,
9093 .type = NFNL_CB_RCU,
9094 .attr_count = NFTA_FLOWTABLE_MAX,
9095 .policy = nft_flowtable_policy,
9097 [NFT_MSG_DELFLOWTABLE] = {
9098 .call = nf_tables_delflowtable,
9099 .type = NFNL_CB_BATCH,
9100 .attr_count = NFTA_FLOWTABLE_MAX,
9101 .policy = nft_flowtable_policy,
9103 [NFT_MSG_DESTROYFLOWTABLE] = {
9104 .call = nf_tables_delflowtable,
9105 .type = NFNL_CB_BATCH,
9106 .attr_count = NFTA_FLOWTABLE_MAX,
9107 .policy = nft_flowtable_policy,
9111 static int nf_tables_validate(struct net *net)
9113 struct nftables_pernet *nft_net = nft_pernet(net);
9114 struct nft_table *table;
9116 list_for_each_entry(table, &nft_net->tables, list) {
9117 switch (table->validate_state) {
9118 case NFT_VALIDATE_SKIP:
9120 case NFT_VALIDATE_NEED:
9121 nft_validate_state_update(table, NFT_VALIDATE_DO);
9123 case NFT_VALIDATE_DO:
9124 if (nft_table_validate(net, table) < 0)
9127 nft_validate_state_update(table, NFT_VALIDATE_SKIP);
9135 /* a drop policy has to be deferred until all rules have been activated,
9136 * otherwise a large ruleset that contains a drop-policy base chain will
9137 * cause all packets to get dropped until the full transaction has been
9140 * We defer the drop policy until the transaction has been finalized.
9142 static void nft_chain_commit_drop_policy(struct nft_trans *trans)
9144 struct nft_base_chain *basechain;
9146 if (nft_trans_chain_policy(trans) != NF_DROP)
9149 if (!nft_is_base_chain(trans->ctx.chain))
9152 basechain = nft_base_chain(trans->ctx.chain);
9153 basechain->policy = NF_DROP;
9156 static void nft_chain_commit_update(struct nft_trans *trans)
9158 struct nft_base_chain *basechain;
9160 if (nft_trans_chain_name(trans)) {
9161 rhltable_remove(&trans->ctx.table->chains_ht,
9162 &trans->ctx.chain->rhlhead,
9163 nft_chain_ht_params);
9164 swap(trans->ctx.chain->name, nft_trans_chain_name(trans));
9165 rhltable_insert_key(&trans->ctx.table->chains_ht,
9166 trans->ctx.chain->name,
9167 &trans->ctx.chain->rhlhead,
9168 nft_chain_ht_params);
9171 if (!nft_is_base_chain(trans->ctx.chain))
9174 nft_chain_stats_replace(trans);
9176 basechain = nft_base_chain(trans->ctx.chain);
9178 switch (nft_trans_chain_policy(trans)) {
9181 basechain->policy = nft_trans_chain_policy(trans);
9186 static void nft_obj_commit_update(struct nft_trans *trans)
9188 struct nft_object *newobj;
9189 struct nft_object *obj;
9191 obj = nft_trans_obj(trans);
9192 newobj = nft_trans_obj_newobj(trans);
9194 if (obj->ops->update)
9195 obj->ops->update(obj, newobj);
9197 nft_obj_destroy(&trans->ctx, newobj);
9200 static void nft_commit_release(struct nft_trans *trans)
9202 switch (trans->msg_type) {
9203 case NFT_MSG_DELTABLE:
9204 case NFT_MSG_DESTROYTABLE:
9205 nf_tables_table_destroy(&trans->ctx);
9207 case NFT_MSG_NEWCHAIN:
9208 free_percpu(nft_trans_chain_stats(trans));
9209 kfree(nft_trans_chain_name(trans));
9211 case NFT_MSG_DELCHAIN:
9212 case NFT_MSG_DESTROYCHAIN:
9213 if (nft_trans_chain_update(trans))
9214 nft_hooks_destroy(&nft_trans_chain_hooks(trans));
9216 nf_tables_chain_destroy(&trans->ctx);
9218 case NFT_MSG_DELRULE:
9219 case NFT_MSG_DESTROYRULE:
9220 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
9222 case NFT_MSG_DELSET:
9223 case NFT_MSG_DESTROYSET:
9224 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
9226 case NFT_MSG_DELSETELEM:
9227 case NFT_MSG_DESTROYSETELEM:
9228 nf_tables_set_elem_destroy(&trans->ctx,
9229 nft_trans_elem_set(trans),
9230 nft_trans_elem(trans).priv);
9232 case NFT_MSG_DELOBJ:
9233 case NFT_MSG_DESTROYOBJ:
9234 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
9236 case NFT_MSG_DELFLOWTABLE:
9237 case NFT_MSG_DESTROYFLOWTABLE:
9238 if (nft_trans_flowtable_update(trans))
9239 nft_hooks_destroy(&nft_trans_flowtable_hooks(trans));
9241 nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
9246 put_net(trans->ctx.net);
9251 static void nf_tables_trans_destroy_work(struct work_struct *w)
9253 struct nft_trans *trans, *next;
9256 spin_lock(&nf_tables_destroy_list_lock);
9257 list_splice_init(&nf_tables_destroy_list, &head);
9258 spin_unlock(&nf_tables_destroy_list_lock);
9260 if (list_empty(&head))
9265 list_for_each_entry_safe(trans, next, &head, list) {
9266 nft_trans_list_del(trans);
9267 nft_commit_release(trans);
9271 void nf_tables_trans_destroy_flush_work(void)
9273 flush_work(&trans_destroy_work);
9275 EXPORT_SYMBOL_GPL(nf_tables_trans_destroy_flush_work);
9277 static bool nft_expr_reduce(struct nft_regs_track *track,
9278 const struct nft_expr *expr)
9283 static int nf_tables_commit_chain_prepare(struct net *net, struct nft_chain *chain)
9285 const struct nft_expr *expr, *last;
9286 struct nft_regs_track track = {};
9287 unsigned int size, data_size;
9288 void *data, *data_boundary;
9289 struct nft_rule_dp *prule;
9290 struct nft_rule *rule;
9292 /* already handled or inactive chain? */
9293 if (chain->blob_next || !nft_is_active_next(net, chain))
9297 list_for_each_entry(rule, &chain->rules, list) {
9298 if (nft_is_active_next(net, rule)) {
9299 data_size += sizeof(*prule) + rule->dlen;
9300 if (data_size > INT_MAX)
9305 chain->blob_next = nf_tables_chain_alloc_rules(chain, data_size);
9306 if (!chain->blob_next)
9309 data = (void *)chain->blob_next->data;
9310 data_boundary = data + data_size;
9313 list_for_each_entry(rule, &chain->rules, list) {
9314 if (!nft_is_active_next(net, rule))
9317 prule = (struct nft_rule_dp *)data;
9318 data += offsetof(struct nft_rule_dp, data);
9319 if (WARN_ON_ONCE(data > data_boundary))
9323 track.last = nft_expr_last(rule);
9324 nft_rule_for_each_expr(expr, last, rule) {
9327 if (nft_expr_reduce(&track, expr)) {
9332 if (WARN_ON_ONCE(data + size + expr->ops->size > data_boundary))
9335 memcpy(data + size, expr, expr->ops->size);
9336 size += expr->ops->size;
9338 if (WARN_ON_ONCE(size >= 1 << 12))
9341 prule->handle = rule->handle;
9347 chain->blob_next->size += (unsigned long)(data - (void *)prule);
9350 if (WARN_ON_ONCE(data > data_boundary))
9353 prule = (struct nft_rule_dp *)data;
9354 nft_last_rule(chain, prule);
9359 static void nf_tables_commit_chain_prepare_cancel(struct net *net)
9361 struct nftables_pernet *nft_net = nft_pernet(net);
9362 struct nft_trans *trans, *next;
9364 list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
9365 struct nft_chain *chain = trans->ctx.chain;
9367 if (trans->msg_type == NFT_MSG_NEWRULE ||
9368 trans->msg_type == NFT_MSG_DELRULE) {
9369 kvfree(chain->blob_next);
9370 chain->blob_next = NULL;
9375 static void __nf_tables_commit_chain_free_rules(struct rcu_head *h)
9377 struct nft_rule_dp_last *l = container_of(h, struct nft_rule_dp_last, h);
9382 static void nf_tables_commit_chain_free_rules_old(struct nft_rule_blob *blob)
9384 struct nft_rule_dp_last *last;
9386 /* last rule trailer is after end marker */
9387 last = (void *)blob + sizeof(*blob) + blob->size;
9390 call_rcu(&last->h, __nf_tables_commit_chain_free_rules);
9393 static void nf_tables_commit_chain(struct net *net, struct nft_chain *chain)
9395 struct nft_rule_blob *g0, *g1;
9398 next_genbit = nft_gencursor_next(net);
9400 g0 = rcu_dereference_protected(chain->blob_gen_0,
9401 lockdep_commit_lock_is_held(net));
9402 g1 = rcu_dereference_protected(chain->blob_gen_1,
9403 lockdep_commit_lock_is_held(net));
9405 /* No changes to this chain? */
9406 if (chain->blob_next == NULL) {
9407 /* chain had no change in last or next generation */
9411 * chain had no change in this generation; make sure next
9412 * one uses same rules as current generation.
9415 rcu_assign_pointer(chain->blob_gen_1, g0);
9416 nf_tables_commit_chain_free_rules_old(g1);
9418 rcu_assign_pointer(chain->blob_gen_0, g1);
9419 nf_tables_commit_chain_free_rules_old(g0);
9426 rcu_assign_pointer(chain->blob_gen_1, chain->blob_next);
9428 rcu_assign_pointer(chain->blob_gen_0, chain->blob_next);
9430 chain->blob_next = NULL;
9436 nf_tables_commit_chain_free_rules_old(g1);
9438 nf_tables_commit_chain_free_rules_old(g0);
9441 static void nft_obj_del(struct nft_object *obj)
9443 rhltable_remove(&nft_objname_ht, &obj->rhlhead, nft_objname_ht_params);
9444 list_del_rcu(&obj->list);
9447 void nft_chain_del(struct nft_chain *chain)
9449 struct nft_table *table = chain->table;
9451 WARN_ON_ONCE(rhltable_remove(&table->chains_ht, &chain->rhlhead,
9452 nft_chain_ht_params));
9453 list_del_rcu(&chain->list);
9456 static void nft_trans_gc_setelem_remove(struct nft_ctx *ctx,
9457 struct nft_trans_gc *trans)
9459 void **priv = trans->priv;
9462 for (i = 0; i < trans->count; i++) {
9463 struct nft_set_elem elem = {
9467 nft_setelem_data_deactivate(ctx->net, trans->set, &elem);
9468 nft_setelem_remove(ctx->net, trans->set, &elem);
9472 void nft_trans_gc_destroy(struct nft_trans_gc *trans)
9474 nft_set_put(trans->set);
9475 put_net(trans->net);
9479 static void nft_trans_gc_trans_free(struct rcu_head *rcu)
9481 struct nft_set_elem elem = {};
9482 struct nft_trans_gc *trans;
9483 struct nft_ctx ctx = {};
9486 trans = container_of(rcu, struct nft_trans_gc, rcu);
9487 ctx.net = read_pnet(&trans->set->net);
9489 for (i = 0; i < trans->count; i++) {
9490 elem.priv = trans->priv[i];
9491 if (!nft_setelem_is_catchall(trans->set, &elem))
9492 atomic_dec(&trans->set->nelems);
9494 nf_tables_set_elem_destroy(&ctx, trans->set, elem.priv);
9497 nft_trans_gc_destroy(trans);
9500 static bool nft_trans_gc_work_done(struct nft_trans_gc *trans)
9502 struct nftables_pernet *nft_net;
9503 struct nft_ctx ctx = {};
9505 nft_net = nft_pernet(trans->net);
9507 mutex_lock(&nft_net->commit_mutex);
9509 /* Check for race with transaction, otherwise this batch refers to
9510 * stale objects that might not be there anymore. Skip transaction if
9511 * set has been destroyed from control plane transaction in case gc
9512 * worker loses race.
9514 if (READ_ONCE(nft_net->gc_seq) != trans->seq || trans->set->dead) {
9515 mutex_unlock(&nft_net->commit_mutex);
9519 ctx.net = trans->net;
9520 ctx.table = trans->set->table;
9522 nft_trans_gc_setelem_remove(&ctx, trans);
9523 mutex_unlock(&nft_net->commit_mutex);
9528 static void nft_trans_gc_work(struct work_struct *work)
9530 struct nft_trans_gc *trans, *next;
9531 LIST_HEAD(trans_gc_list);
9533 spin_lock(&nf_tables_gc_list_lock);
9534 list_splice_init(&nf_tables_gc_list, &trans_gc_list);
9535 spin_unlock(&nf_tables_gc_list_lock);
9537 list_for_each_entry_safe(trans, next, &trans_gc_list, list) {
9538 list_del(&trans->list);
9539 if (!nft_trans_gc_work_done(trans)) {
9540 nft_trans_gc_destroy(trans);
9543 call_rcu(&trans->rcu, nft_trans_gc_trans_free);
9547 struct nft_trans_gc *nft_trans_gc_alloc(struct nft_set *set,
9548 unsigned int gc_seq, gfp_t gfp)
9550 struct net *net = read_pnet(&set->net);
9551 struct nft_trans_gc *trans;
9553 trans = kzalloc(sizeof(*trans), gfp);
9557 trans->net = maybe_get_net(net);
9563 refcount_inc(&set->refs);
9565 trans->seq = gc_seq;
9570 void nft_trans_gc_elem_add(struct nft_trans_gc *trans, void *priv)
9572 trans->priv[trans->count++] = priv;
9575 static void nft_trans_gc_queue_work(struct nft_trans_gc *trans)
9577 spin_lock(&nf_tables_gc_list_lock);
9578 list_add_tail(&trans->list, &nf_tables_gc_list);
9579 spin_unlock(&nf_tables_gc_list_lock);
9581 schedule_work(&trans_gc_work);
9584 static int nft_trans_gc_space(struct nft_trans_gc *trans)
9586 return NFT_TRANS_GC_BATCHCOUNT - trans->count;
9589 struct nft_trans_gc *nft_trans_gc_queue_async(struct nft_trans_gc *gc,
9590 unsigned int gc_seq, gfp_t gfp)
9592 struct nft_set *set;
9594 if (nft_trans_gc_space(gc))
9598 nft_trans_gc_queue_work(gc);
9600 return nft_trans_gc_alloc(set, gc_seq, gfp);
9603 void nft_trans_gc_queue_async_done(struct nft_trans_gc *trans)
9605 if (trans->count == 0) {
9606 nft_trans_gc_destroy(trans);
9610 nft_trans_gc_queue_work(trans);
9613 struct nft_trans_gc *nft_trans_gc_queue_sync(struct nft_trans_gc *gc, gfp_t gfp)
9615 struct nft_set *set;
9617 if (WARN_ON_ONCE(!lockdep_commit_lock_is_held(gc->net)))
9620 if (nft_trans_gc_space(gc))
9624 call_rcu(&gc->rcu, nft_trans_gc_trans_free);
9626 return nft_trans_gc_alloc(set, 0, gfp);
9629 void nft_trans_gc_queue_sync_done(struct nft_trans_gc *trans)
9631 WARN_ON_ONCE(!lockdep_commit_lock_is_held(trans->net));
9633 if (trans->count == 0) {
9634 nft_trans_gc_destroy(trans);
9638 call_rcu(&trans->rcu, nft_trans_gc_trans_free);
9641 static struct nft_trans_gc *nft_trans_gc_catchall(struct nft_trans_gc *gc,
9642 unsigned int gc_seq,
9645 struct nft_set_elem_catchall *catchall;
9646 const struct nft_set *set = gc->set;
9647 struct nft_set_ext *ext;
9649 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
9650 ext = nft_set_elem_ext(set, catchall->elem);
9652 if (!nft_set_elem_expired(ext))
9654 if (nft_set_elem_is_dead(ext))
9657 nft_set_elem_dead(ext);
9660 gc = nft_trans_gc_queue_sync(gc, GFP_ATOMIC);
9662 gc = nft_trans_gc_queue_async(gc, gc_seq, GFP_ATOMIC);
9667 nft_trans_gc_elem_add(gc, catchall->elem);
9673 struct nft_trans_gc *nft_trans_gc_catchall_async(struct nft_trans_gc *gc,
9674 unsigned int gc_seq)
9676 return nft_trans_gc_catchall(gc, gc_seq, false);
9679 struct nft_trans_gc *nft_trans_gc_catchall_sync(struct nft_trans_gc *gc)
9681 return nft_trans_gc_catchall(gc, 0, true);
9684 static void nf_tables_module_autoload_cleanup(struct net *net)
9686 struct nftables_pernet *nft_net = nft_pernet(net);
9687 struct nft_module_request *req, *next;
9689 WARN_ON_ONCE(!list_empty(&nft_net->commit_list));
9690 list_for_each_entry_safe(req, next, &nft_net->module_list, list) {
9691 WARN_ON_ONCE(!req->done);
9692 list_del(&req->list);
9697 static void nf_tables_commit_release(struct net *net)
9699 struct nftables_pernet *nft_net = nft_pernet(net);
9700 struct nft_trans *trans;
9702 /* all side effects have to be made visible.
9703 * For example, if a chain named 'foo' has been deleted, a
9704 * new transaction must not find it anymore.
9706 * Memory reclaim happens asynchronously from work queue
9707 * to prevent expensive synchronize_rcu() in commit phase.
9709 if (list_empty(&nft_net->commit_list)) {
9710 nf_tables_module_autoload_cleanup(net);
9711 mutex_unlock(&nft_net->commit_mutex);
9715 trans = list_last_entry(&nft_net->commit_list,
9716 struct nft_trans, list);
9717 get_net(trans->ctx.net);
9718 WARN_ON_ONCE(trans->put_net);
9720 trans->put_net = true;
9721 spin_lock(&nf_tables_destroy_list_lock);
9722 list_splice_tail_init(&nft_net->commit_list, &nf_tables_destroy_list);
9723 spin_unlock(&nf_tables_destroy_list_lock);
9725 nf_tables_module_autoload_cleanup(net);
9726 schedule_work(&trans_destroy_work);
9728 mutex_unlock(&nft_net->commit_mutex);
9731 static void nft_commit_notify(struct net *net, u32 portid)
9733 struct nftables_pernet *nft_net = nft_pernet(net);
9734 struct sk_buff *batch_skb = NULL, *nskb, *skb;
9735 unsigned char *data;
9738 list_for_each_entry_safe(skb, nskb, &nft_net->notify_list, list) {
9742 len = NLMSG_GOODSIZE - skb->len;
9743 list_del(&skb->list);
9747 if (len > 0 && NFT_CB(skb).report == NFT_CB(batch_skb).report) {
9748 data = skb_put(batch_skb, skb->len);
9749 memcpy(data, skb->data, skb->len);
9750 list_del(&skb->list);
9754 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
9755 NFT_CB(batch_skb).report, GFP_KERNEL);
9760 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
9761 NFT_CB(batch_skb).report, GFP_KERNEL);
9764 WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
9767 static int nf_tables_commit_audit_alloc(struct list_head *adl,
9768 struct nft_table *table)
9770 struct nft_audit_data *adp;
9772 list_for_each_entry(adp, adl, list) {
9773 if (adp->table == table)
9776 adp = kzalloc(sizeof(*adp), GFP_KERNEL);
9780 list_add(&adp->list, adl);
9784 static void nf_tables_commit_audit_free(struct list_head *adl)
9786 struct nft_audit_data *adp, *adn;
9788 list_for_each_entry_safe(adp, adn, adl, list) {
9789 list_del(&adp->list);
9794 static void nf_tables_commit_audit_collect(struct list_head *adl,
9795 struct nft_table *table, u32 op)
9797 struct nft_audit_data *adp;
9799 list_for_each_entry(adp, adl, list) {
9800 if (adp->table == table)
9803 WARN_ONCE(1, "table=%s not expected in commit list", table->name);
9807 if (!adp->op || adp->op > op)
9811 #define AUNFTABLENAMELEN (NFT_TABLE_MAXNAMELEN + 22)
9813 static void nf_tables_commit_audit_log(struct list_head *adl, u32 generation)
9815 struct nft_audit_data *adp, *adn;
9816 char aubuf[AUNFTABLENAMELEN];
9818 list_for_each_entry_safe(adp, adn, adl, list) {
9819 snprintf(aubuf, AUNFTABLENAMELEN, "%s:%u", adp->table->name,
9821 audit_log_nfcfg(aubuf, adp->table->family, adp->entries,
9822 nft2audit_op[adp->op], GFP_KERNEL);
9823 list_del(&adp->list);
9828 static void nft_set_commit_update(struct list_head *set_update_list)
9830 struct nft_set *set, *next;
9832 list_for_each_entry_safe(set, next, set_update_list, pending_update) {
9833 list_del_init(&set->pending_update);
9835 if (!set->ops->commit)
9838 set->ops->commit(set);
9842 static unsigned int nft_gc_seq_begin(struct nftables_pernet *nft_net)
9844 unsigned int gc_seq;
9846 /* Bump gc counter, it becomes odd, this is the busy mark. */
9847 gc_seq = READ_ONCE(nft_net->gc_seq);
9848 WRITE_ONCE(nft_net->gc_seq, ++gc_seq);
9853 static void nft_gc_seq_end(struct nftables_pernet *nft_net, unsigned int gc_seq)
9855 WRITE_ONCE(nft_net->gc_seq, ++gc_seq);
9858 static int nf_tables_commit(struct net *net, struct sk_buff *skb)
9860 struct nftables_pernet *nft_net = nft_pernet(net);
9861 struct nft_trans *trans, *next;
9862 unsigned int base_seq, gc_seq;
9863 LIST_HEAD(set_update_list);
9864 struct nft_trans_elem *te;
9865 struct nft_chain *chain;
9866 struct nft_table *table;
9870 if (list_empty(&nft_net->commit_list)) {
9871 mutex_unlock(&nft_net->commit_mutex);
9875 list_for_each_entry(trans, &nft_net->binding_list, binding_list) {
9876 switch (trans->msg_type) {
9877 case NFT_MSG_NEWSET:
9878 if (!nft_trans_set_update(trans) &&
9879 nft_set_is_anonymous(nft_trans_set(trans)) &&
9880 !nft_trans_set_bound(trans)) {
9881 pr_warn_once("nftables ruleset with unbound set\n");
9885 case NFT_MSG_NEWCHAIN:
9886 if (!nft_trans_chain_update(trans) &&
9887 nft_chain_binding(nft_trans_chain(trans)) &&
9888 !nft_trans_chain_bound(trans)) {
9889 pr_warn_once("nftables ruleset with unbound chain\n");
9896 /* 0. Validate ruleset, otherwise roll back for error reporting. */
9897 if (nf_tables_validate(net) < 0) {
9898 nft_net->validate_state = NFT_VALIDATE_DO;
9902 err = nft_flow_rule_offload_commit(net);
9906 /* 1. Allocate space for next generation rules_gen_X[] */
9907 list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
9910 ret = nf_tables_commit_audit_alloc(&adl, trans->ctx.table);
9912 nf_tables_commit_chain_prepare_cancel(net);
9913 nf_tables_commit_audit_free(&adl);
9916 if (trans->msg_type == NFT_MSG_NEWRULE ||
9917 trans->msg_type == NFT_MSG_DELRULE) {
9918 chain = trans->ctx.chain;
9920 ret = nf_tables_commit_chain_prepare(net, chain);
9922 nf_tables_commit_chain_prepare_cancel(net);
9923 nf_tables_commit_audit_free(&adl);
9929 /* step 2. Make rules_gen_X visible to packet path */
9930 list_for_each_entry(table, &nft_net->tables, list) {
9931 list_for_each_entry(chain, &table->chains, list)
9932 nf_tables_commit_chain(net, chain);
9936 * Bump generation counter, invalidate any dump in progress.
9937 * Cannot fail after this point.
9939 base_seq = READ_ONCE(nft_net->base_seq);
9940 while (++base_seq == 0)
9943 WRITE_ONCE(nft_net->base_seq, base_seq);
9945 gc_seq = nft_gc_seq_begin(nft_net);
9947 /* step 3. Start new generation, rules_gen_X now in use. */
9948 net->nft.gencursor = nft_gencursor_next(net);
9950 list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
9951 nf_tables_commit_audit_collect(&adl, trans->ctx.table,
9953 switch (trans->msg_type) {
9954 case NFT_MSG_NEWTABLE:
9955 if (nft_trans_table_update(trans)) {
9956 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
9957 nft_trans_destroy(trans);
9960 if (trans->ctx.table->flags & NFT_TABLE_F_DORMANT)
9961 nf_tables_table_disable(net, trans->ctx.table);
9963 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
9965 nft_clear(net, trans->ctx.table);
9967 nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
9968 nft_trans_destroy(trans);
9970 case NFT_MSG_DELTABLE:
9971 case NFT_MSG_DESTROYTABLE:
9972 list_del_rcu(&trans->ctx.table->list);
9973 nf_tables_table_notify(&trans->ctx, trans->msg_type);
9975 case NFT_MSG_NEWCHAIN:
9976 if (nft_trans_chain_update(trans)) {
9977 nft_chain_commit_update(trans);
9978 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN,
9979 &nft_trans_chain_hooks(trans));
9980 list_splice(&nft_trans_chain_hooks(trans),
9981 &nft_trans_basechain(trans)->hook_list);
9982 /* trans destroyed after rcu grace period */
9984 nft_chain_commit_drop_policy(trans);
9985 nft_clear(net, trans->ctx.chain);
9986 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN, NULL);
9987 nft_trans_destroy(trans);
9990 case NFT_MSG_DELCHAIN:
9991 case NFT_MSG_DESTROYCHAIN:
9992 if (nft_trans_chain_update(trans)) {
9993 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN,
9994 &nft_trans_chain_hooks(trans));
9995 nft_netdev_unregister_hooks(net,
9996 &nft_trans_chain_hooks(trans),
9999 nft_chain_del(trans->ctx.chain);
10000 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN,
10002 nf_tables_unregister_hook(trans->ctx.net,
10007 case NFT_MSG_NEWRULE:
10008 nft_clear(trans->ctx.net, nft_trans_rule(trans));
10009 nf_tables_rule_notify(&trans->ctx,
10010 nft_trans_rule(trans),
10012 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
10013 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
10015 nft_trans_destroy(trans);
10017 case NFT_MSG_DELRULE:
10018 case NFT_MSG_DESTROYRULE:
10019 list_del_rcu(&nft_trans_rule(trans)->list);
10020 nf_tables_rule_notify(&trans->ctx,
10021 nft_trans_rule(trans),
10023 nft_rule_expr_deactivate(&trans->ctx,
10024 nft_trans_rule(trans),
10027 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
10028 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
10030 case NFT_MSG_NEWSET:
10031 if (nft_trans_set_update(trans)) {
10032 struct nft_set *set = nft_trans_set(trans);
10034 WRITE_ONCE(set->timeout, nft_trans_set_timeout(trans));
10035 WRITE_ONCE(set->gc_int, nft_trans_set_gc_int(trans));
10037 if (nft_trans_set_size(trans))
10038 WRITE_ONCE(set->size, nft_trans_set_size(trans));
10040 nft_clear(net, nft_trans_set(trans));
10041 /* This avoids hitting -EBUSY when deleting the table
10042 * from the transaction.
10044 if (nft_set_is_anonymous(nft_trans_set(trans)) &&
10045 !list_empty(&nft_trans_set(trans)->bindings))
10046 nft_use_dec(&trans->ctx.table->use);
10048 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
10049 NFT_MSG_NEWSET, GFP_KERNEL);
10050 nft_trans_destroy(trans);
10052 case NFT_MSG_DELSET:
10053 case NFT_MSG_DESTROYSET:
10054 nft_trans_set(trans)->dead = 1;
10055 list_del_rcu(&nft_trans_set(trans)->list);
10056 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
10057 trans->msg_type, GFP_KERNEL);
10059 case NFT_MSG_NEWSETELEM:
10060 te = (struct nft_trans_elem *)trans->data;
10062 nft_setelem_activate(net, te->set, &te->elem);
10063 nf_tables_setelem_notify(&trans->ctx, te->set,
10065 NFT_MSG_NEWSETELEM);
10066 if (te->set->ops->commit &&
10067 list_empty(&te->set->pending_update)) {
10068 list_add_tail(&te->set->pending_update,
10071 nft_trans_destroy(trans);
10073 case NFT_MSG_DELSETELEM:
10074 case NFT_MSG_DESTROYSETELEM:
10075 te = (struct nft_trans_elem *)trans->data;
10077 nf_tables_setelem_notify(&trans->ctx, te->set,
10080 nft_setelem_remove(net, te->set, &te->elem);
10081 if (!nft_setelem_is_catchall(te->set, &te->elem)) {
10082 atomic_dec(&te->set->nelems);
10085 if (te->set->ops->commit &&
10086 list_empty(&te->set->pending_update)) {
10087 list_add_tail(&te->set->pending_update,
10091 case NFT_MSG_NEWOBJ:
10092 if (nft_trans_obj_update(trans)) {
10093 nft_obj_commit_update(trans);
10094 nf_tables_obj_notify(&trans->ctx,
10095 nft_trans_obj(trans),
10098 nft_clear(net, nft_trans_obj(trans));
10099 nf_tables_obj_notify(&trans->ctx,
10100 nft_trans_obj(trans),
10102 nft_trans_destroy(trans);
10105 case NFT_MSG_DELOBJ:
10106 case NFT_MSG_DESTROYOBJ:
10107 nft_obj_del(nft_trans_obj(trans));
10108 nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
10111 case NFT_MSG_NEWFLOWTABLE:
10112 if (nft_trans_flowtable_update(trans)) {
10113 nft_trans_flowtable(trans)->data.flags =
10114 nft_trans_flowtable_flags(trans);
10115 nf_tables_flowtable_notify(&trans->ctx,
10116 nft_trans_flowtable(trans),
10117 &nft_trans_flowtable_hooks(trans),
10118 NFT_MSG_NEWFLOWTABLE);
10119 list_splice(&nft_trans_flowtable_hooks(trans),
10120 &nft_trans_flowtable(trans)->hook_list);
10122 nft_clear(net, nft_trans_flowtable(trans));
10123 nf_tables_flowtable_notify(&trans->ctx,
10124 nft_trans_flowtable(trans),
10126 NFT_MSG_NEWFLOWTABLE);
10128 nft_trans_destroy(trans);
10130 case NFT_MSG_DELFLOWTABLE:
10131 case NFT_MSG_DESTROYFLOWTABLE:
10132 if (nft_trans_flowtable_update(trans)) {
10133 nf_tables_flowtable_notify(&trans->ctx,
10134 nft_trans_flowtable(trans),
10135 &nft_trans_flowtable_hooks(trans),
10137 nft_unregister_flowtable_net_hooks(net,
10138 &nft_trans_flowtable_hooks(trans));
10140 list_del_rcu(&nft_trans_flowtable(trans)->list);
10141 nf_tables_flowtable_notify(&trans->ctx,
10142 nft_trans_flowtable(trans),
10145 nft_unregister_flowtable_net_hooks(net,
10146 &nft_trans_flowtable(trans)->hook_list);
10152 nft_set_commit_update(&set_update_list);
10154 nft_commit_notify(net, NETLINK_CB(skb).portid);
10155 nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
10156 nf_tables_commit_audit_log(&adl, nft_net->base_seq);
10158 nft_gc_seq_end(nft_net, gc_seq);
10159 nft_net->validate_state = NFT_VALIDATE_SKIP;
10160 nf_tables_commit_release(net);
10165 static void nf_tables_module_autoload(struct net *net)
10167 struct nftables_pernet *nft_net = nft_pernet(net);
10168 struct nft_module_request *req, *next;
10169 LIST_HEAD(module_list);
10171 list_splice_init(&nft_net->module_list, &module_list);
10172 mutex_unlock(&nft_net->commit_mutex);
10173 list_for_each_entry_safe(req, next, &module_list, list) {
10174 request_module("%s", req->module);
10177 mutex_lock(&nft_net->commit_mutex);
10178 list_splice(&module_list, &nft_net->module_list);
10181 static void nf_tables_abort_release(struct nft_trans *trans)
10183 switch (trans->msg_type) {
10184 case NFT_MSG_NEWTABLE:
10185 nf_tables_table_destroy(&trans->ctx);
10187 case NFT_MSG_NEWCHAIN:
10188 if (nft_trans_chain_update(trans))
10189 nft_hooks_destroy(&nft_trans_chain_hooks(trans));
10191 nf_tables_chain_destroy(&trans->ctx);
10193 case NFT_MSG_NEWRULE:
10194 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
10196 case NFT_MSG_NEWSET:
10197 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
10199 case NFT_MSG_NEWSETELEM:
10200 nft_set_elem_destroy(nft_trans_elem_set(trans),
10201 nft_trans_elem(trans).priv, true);
10203 case NFT_MSG_NEWOBJ:
10204 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
10206 case NFT_MSG_NEWFLOWTABLE:
10207 if (nft_trans_flowtable_update(trans))
10208 nft_hooks_destroy(&nft_trans_flowtable_hooks(trans));
10210 nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
10216 static void nft_set_abort_update(struct list_head *set_update_list)
10218 struct nft_set *set, *next;
10220 list_for_each_entry_safe(set, next, set_update_list, pending_update) {
10221 list_del_init(&set->pending_update);
10223 if (!set->ops->abort)
10226 set->ops->abort(set);
10230 static int __nf_tables_abort(struct net *net, enum nfnl_abort_action action)
10232 struct nftables_pernet *nft_net = nft_pernet(net);
10233 struct nft_trans *trans, *next;
10234 LIST_HEAD(set_update_list);
10235 struct nft_trans_elem *te;
10237 if (action == NFNL_ABORT_VALIDATE &&
10238 nf_tables_validate(net) < 0)
10241 list_for_each_entry_safe_reverse(trans, next, &nft_net->commit_list,
10243 switch (trans->msg_type) {
10244 case NFT_MSG_NEWTABLE:
10245 if (nft_trans_table_update(trans)) {
10246 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
10247 nft_trans_destroy(trans);
10250 if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_DORMANT) {
10251 nf_tables_table_disable(net, trans->ctx.table);
10252 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
10253 } else if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_AWAKEN) {
10254 trans->ctx.table->flags &= ~NFT_TABLE_F_DORMANT;
10256 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
10257 nft_trans_destroy(trans);
10259 list_del_rcu(&trans->ctx.table->list);
10262 case NFT_MSG_DELTABLE:
10263 case NFT_MSG_DESTROYTABLE:
10264 nft_clear(trans->ctx.net, trans->ctx.table);
10265 nft_trans_destroy(trans);
10267 case NFT_MSG_NEWCHAIN:
10268 if (nft_trans_chain_update(trans)) {
10269 nft_netdev_unregister_hooks(net,
10270 &nft_trans_chain_hooks(trans),
10272 free_percpu(nft_trans_chain_stats(trans));
10273 kfree(nft_trans_chain_name(trans));
10274 nft_trans_destroy(trans);
10276 if (nft_trans_chain_bound(trans)) {
10277 nft_trans_destroy(trans);
10280 nft_use_dec_restore(&trans->ctx.table->use);
10281 nft_chain_del(trans->ctx.chain);
10282 nf_tables_unregister_hook(trans->ctx.net,
10287 case NFT_MSG_DELCHAIN:
10288 case NFT_MSG_DESTROYCHAIN:
10289 if (nft_trans_chain_update(trans)) {
10290 list_splice(&nft_trans_chain_hooks(trans),
10291 &nft_trans_basechain(trans)->hook_list);
10293 nft_use_inc_restore(&trans->ctx.table->use);
10294 nft_clear(trans->ctx.net, trans->ctx.chain);
10296 nft_trans_destroy(trans);
10298 case NFT_MSG_NEWRULE:
10299 if (nft_trans_rule_bound(trans)) {
10300 nft_trans_destroy(trans);
10303 nft_use_dec_restore(&trans->ctx.chain->use);
10304 list_del_rcu(&nft_trans_rule(trans)->list);
10305 nft_rule_expr_deactivate(&trans->ctx,
10306 nft_trans_rule(trans),
10308 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
10309 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
10311 case NFT_MSG_DELRULE:
10312 case NFT_MSG_DESTROYRULE:
10313 nft_use_inc_restore(&trans->ctx.chain->use);
10314 nft_clear(trans->ctx.net, nft_trans_rule(trans));
10315 nft_rule_expr_activate(&trans->ctx, nft_trans_rule(trans));
10316 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
10317 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
10319 nft_trans_destroy(trans);
10321 case NFT_MSG_NEWSET:
10322 if (nft_trans_set_update(trans)) {
10323 nft_trans_destroy(trans);
10326 nft_use_dec_restore(&trans->ctx.table->use);
10327 if (nft_trans_set_bound(trans)) {
10328 nft_trans_destroy(trans);
10331 list_del_rcu(&nft_trans_set(trans)->list);
10333 case NFT_MSG_DELSET:
10334 case NFT_MSG_DESTROYSET:
10335 nft_use_inc_restore(&trans->ctx.table->use);
10336 nft_clear(trans->ctx.net, nft_trans_set(trans));
10337 if (nft_trans_set(trans)->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
10338 nft_map_activate(&trans->ctx, nft_trans_set(trans));
10340 nft_trans_destroy(trans);
10342 case NFT_MSG_NEWSETELEM:
10343 if (nft_trans_elem_set_bound(trans)) {
10344 nft_trans_destroy(trans);
10347 te = (struct nft_trans_elem *)trans->data;
10348 nft_setelem_remove(net, te->set, &te->elem);
10349 if (!nft_setelem_is_catchall(te->set, &te->elem))
10350 atomic_dec(&te->set->nelems);
10352 if (te->set->ops->abort &&
10353 list_empty(&te->set->pending_update)) {
10354 list_add_tail(&te->set->pending_update,
10358 case NFT_MSG_DELSETELEM:
10359 case NFT_MSG_DESTROYSETELEM:
10360 te = (struct nft_trans_elem *)trans->data;
10362 nft_setelem_data_activate(net, te->set, &te->elem);
10363 nft_setelem_activate(net, te->set, &te->elem);
10364 if (!nft_setelem_is_catchall(te->set, &te->elem))
10367 if (te->set->ops->abort &&
10368 list_empty(&te->set->pending_update)) {
10369 list_add_tail(&te->set->pending_update,
10372 nft_trans_destroy(trans);
10374 case NFT_MSG_NEWOBJ:
10375 if (nft_trans_obj_update(trans)) {
10376 nft_obj_destroy(&trans->ctx, nft_trans_obj_newobj(trans));
10377 nft_trans_destroy(trans);
10379 nft_use_dec_restore(&trans->ctx.table->use);
10380 nft_obj_del(nft_trans_obj(trans));
10383 case NFT_MSG_DELOBJ:
10384 case NFT_MSG_DESTROYOBJ:
10385 nft_use_inc_restore(&trans->ctx.table->use);
10386 nft_clear(trans->ctx.net, nft_trans_obj(trans));
10387 nft_trans_destroy(trans);
10389 case NFT_MSG_NEWFLOWTABLE:
10390 if (nft_trans_flowtable_update(trans)) {
10391 nft_unregister_flowtable_net_hooks(net,
10392 &nft_trans_flowtable_hooks(trans));
10394 nft_use_dec_restore(&trans->ctx.table->use);
10395 list_del_rcu(&nft_trans_flowtable(trans)->list);
10396 nft_unregister_flowtable_net_hooks(net,
10397 &nft_trans_flowtable(trans)->hook_list);
10400 case NFT_MSG_DELFLOWTABLE:
10401 case NFT_MSG_DESTROYFLOWTABLE:
10402 if (nft_trans_flowtable_update(trans)) {
10403 list_splice(&nft_trans_flowtable_hooks(trans),
10404 &nft_trans_flowtable(trans)->hook_list);
10406 nft_use_inc_restore(&trans->ctx.table->use);
10407 nft_clear(trans->ctx.net, nft_trans_flowtable(trans));
10409 nft_trans_destroy(trans);
10414 nft_set_abort_update(&set_update_list);
10418 list_for_each_entry_safe_reverse(trans, next,
10419 &nft_net->commit_list, list) {
10420 nft_trans_list_del(trans);
10421 nf_tables_abort_release(trans);
10424 if (action == NFNL_ABORT_AUTOLOAD)
10425 nf_tables_module_autoload(net);
10427 nf_tables_module_autoload_cleanup(net);
10432 static int nf_tables_abort(struct net *net, struct sk_buff *skb,
10433 enum nfnl_abort_action action)
10435 struct nftables_pernet *nft_net = nft_pernet(net);
10436 unsigned int gc_seq;
10439 gc_seq = nft_gc_seq_begin(nft_net);
10440 ret = __nf_tables_abort(net, action);
10441 nft_gc_seq_end(nft_net, gc_seq);
10442 mutex_unlock(&nft_net->commit_mutex);
10447 static bool nf_tables_valid_genid(struct net *net, u32 genid)
10449 struct nftables_pernet *nft_net = nft_pernet(net);
10452 mutex_lock(&nft_net->commit_mutex);
10454 genid_ok = genid == 0 || nft_net->base_seq == genid;
10456 mutex_unlock(&nft_net->commit_mutex);
10458 /* else, commit mutex has to be released by commit or abort function */
10462 static const struct nfnetlink_subsystem nf_tables_subsys = {
10463 .name = "nf_tables",
10464 .subsys_id = NFNL_SUBSYS_NFTABLES,
10465 .cb_count = NFT_MSG_MAX,
10466 .cb = nf_tables_cb,
10467 .commit = nf_tables_commit,
10468 .abort = nf_tables_abort,
10469 .valid_genid = nf_tables_valid_genid,
10470 .owner = THIS_MODULE,
10473 int nft_chain_validate_dependency(const struct nft_chain *chain,
10474 enum nft_chain_types type)
10476 const struct nft_base_chain *basechain;
10478 if (nft_is_base_chain(chain)) {
10479 basechain = nft_base_chain(chain);
10480 if (basechain->type->type != type)
10481 return -EOPNOTSUPP;
10485 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
10487 int nft_chain_validate_hooks(const struct nft_chain *chain,
10488 unsigned int hook_flags)
10490 struct nft_base_chain *basechain;
10492 if (nft_is_base_chain(chain)) {
10493 basechain = nft_base_chain(chain);
10495 if ((1 << basechain->ops.hooknum) & hook_flags)
10498 return -EOPNOTSUPP;
10503 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
10506 * Loop detection - walk through the ruleset beginning at the destination chain
10507 * of a new jump until either the source chain is reached (loop) or all
10508 * reachable chains have been traversed.
10510 * The loop check is performed whenever a new jump verdict is added to an
10511 * expression or verdict map or a verdict map is bound to a new chain.
10514 static int nf_tables_check_loops(const struct nft_ctx *ctx,
10515 const struct nft_chain *chain);
10517 static int nft_check_loops(const struct nft_ctx *ctx,
10518 const struct nft_set_ext *ext)
10520 const struct nft_data *data;
10523 data = nft_set_ext_data(ext);
10524 switch (data->verdict.code) {
10527 ret = nf_tables_check_loops(ctx, data->verdict.chain);
10537 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
10538 struct nft_set *set,
10539 const struct nft_set_iter *iter,
10540 struct nft_set_elem *elem)
10542 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
10544 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
10545 *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
10548 return nft_check_loops(ctx, ext);
10551 static int nft_set_catchall_loops(const struct nft_ctx *ctx,
10552 struct nft_set *set)
10554 u8 genmask = nft_genmask_next(ctx->net);
10555 struct nft_set_elem_catchall *catchall;
10556 struct nft_set_ext *ext;
10559 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
10560 ext = nft_set_elem_ext(set, catchall->elem);
10561 if (!nft_set_elem_active(ext, genmask))
10564 ret = nft_check_loops(ctx, ext);
10572 static int nf_tables_check_loops(const struct nft_ctx *ctx,
10573 const struct nft_chain *chain)
10575 const struct nft_rule *rule;
10576 const struct nft_expr *expr, *last;
10577 struct nft_set *set;
10578 struct nft_set_binding *binding;
10579 struct nft_set_iter iter;
10581 if (ctx->chain == chain)
10584 if (fatal_signal_pending(current))
10587 list_for_each_entry(rule, &chain->rules, list) {
10588 nft_rule_for_each_expr(expr, last, rule) {
10589 struct nft_immediate_expr *priv;
10590 const struct nft_data *data;
10593 if (strcmp(expr->ops->type->name, "immediate"))
10596 priv = nft_expr_priv(expr);
10597 if (priv->dreg != NFT_REG_VERDICT)
10600 data = &priv->data;
10601 switch (data->verdict.code) {
10604 err = nf_tables_check_loops(ctx,
10605 data->verdict.chain);
10615 list_for_each_entry(set, &ctx->table->sets, list) {
10616 if (!nft_is_active_next(ctx->net, set))
10618 if (!(set->flags & NFT_SET_MAP) ||
10619 set->dtype != NFT_DATA_VERDICT)
10622 list_for_each_entry(binding, &set->bindings, list) {
10623 if (!(binding->flags & NFT_SET_MAP) ||
10624 binding->chain != chain)
10627 iter.genmask = nft_genmask_next(ctx->net);
10631 iter.fn = nf_tables_loop_check_setelem;
10633 set->ops->walk(ctx, set, &iter);
10635 iter.err = nft_set_catchall_loops(ctx, set);
10646 * nft_parse_u32_check - fetch u32 attribute and check for maximum value
10648 * @attr: netlink attribute to fetch value from
10649 * @max: maximum value to be stored in dest
10650 * @dest: pointer to the variable
10652 * Parse, check and store a given u32 netlink attribute into variable.
10653 * This function returns -ERANGE if the value goes over maximum value.
10654 * Otherwise a 0 is returned and the attribute value is stored in the
10655 * destination variable.
10657 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
10661 val = ntohl(nla_get_be32(attr));
10668 EXPORT_SYMBOL_GPL(nft_parse_u32_check);
10670 static int nft_parse_register(const struct nlattr *attr, u32 *preg)
10674 reg = ntohl(nla_get_be32(attr));
10676 case NFT_REG_VERDICT...NFT_REG_4:
10677 *preg = reg * NFT_REG_SIZE / NFT_REG32_SIZE;
10679 case NFT_REG32_00...NFT_REG32_15:
10680 *preg = reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
10690 * nft_dump_register - dump a register value to a netlink attribute
10692 * @skb: socket buffer
10693 * @attr: attribute number
10694 * @reg: register number
10696 * Construct a netlink attribute containing the register number. For
10697 * compatibility reasons, register numbers being a multiple of 4 are
10698 * translated to the corresponding 128 bit register numbers.
10700 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
10702 if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
10703 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
10705 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
10707 return nla_put_be32(skb, attr, htonl(reg));
10709 EXPORT_SYMBOL_GPL(nft_dump_register);
10711 static int nft_validate_register_load(enum nft_registers reg, unsigned int len)
10713 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
10717 if (reg * NFT_REG32_SIZE + len > sizeof_field(struct nft_regs, data))
10723 int nft_parse_register_load(const struct nlattr *attr, u8 *sreg, u32 len)
10728 err = nft_parse_register(attr, ®);
10732 err = nft_validate_register_load(reg, len);
10739 EXPORT_SYMBOL_GPL(nft_parse_register_load);
10741 static int nft_validate_register_store(const struct nft_ctx *ctx,
10742 enum nft_registers reg,
10743 const struct nft_data *data,
10744 enum nft_data_types type,
10750 case NFT_REG_VERDICT:
10751 if (type != NFT_DATA_VERDICT)
10754 if (data != NULL &&
10755 (data->verdict.code == NFT_GOTO ||
10756 data->verdict.code == NFT_JUMP)) {
10757 err = nf_tables_check_loops(ctx, data->verdict.chain);
10764 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
10768 if (reg * NFT_REG32_SIZE + len >
10769 sizeof_field(struct nft_regs, data))
10772 if (data != NULL && type != NFT_DATA_VALUE)
10778 int nft_parse_register_store(const struct nft_ctx *ctx,
10779 const struct nlattr *attr, u8 *dreg,
10780 const struct nft_data *data,
10781 enum nft_data_types type, unsigned int len)
10786 err = nft_parse_register(attr, ®);
10790 err = nft_validate_register_store(ctx, reg, data, type, len);
10797 EXPORT_SYMBOL_GPL(nft_parse_register_store);
10799 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
10800 [NFTA_VERDICT_CODE] = { .type = NLA_U32 },
10801 [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING,
10802 .len = NFT_CHAIN_MAXNAMELEN - 1 },
10803 [NFTA_VERDICT_CHAIN_ID] = { .type = NLA_U32 },
10806 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
10807 struct nft_data_desc *desc, const struct nlattr *nla)
10809 u8 genmask = nft_genmask_next(ctx->net);
10810 struct nlattr *tb[NFTA_VERDICT_MAX + 1];
10811 struct nft_chain *chain;
10814 err = nla_parse_nested_deprecated(tb, NFTA_VERDICT_MAX, nla,
10815 nft_verdict_policy, NULL);
10819 if (!tb[NFTA_VERDICT_CODE])
10822 /* zero padding hole for memcmp */
10823 memset(data, 0, sizeof(*data));
10824 data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
10826 switch (data->verdict.code) {
10828 switch (data->verdict.code & NF_VERDICT_MASK) {
10843 if (tb[NFTA_VERDICT_CHAIN]) {
10844 chain = nft_chain_lookup(ctx->net, ctx->table,
10845 tb[NFTA_VERDICT_CHAIN],
10847 } else if (tb[NFTA_VERDICT_CHAIN_ID]) {
10848 chain = nft_chain_lookup_byid(ctx->net, ctx->table,
10849 tb[NFTA_VERDICT_CHAIN_ID],
10852 return PTR_ERR(chain);
10858 return PTR_ERR(chain);
10859 if (nft_is_base_chain(chain))
10860 return -EOPNOTSUPP;
10861 if (nft_chain_is_bound(chain))
10863 if (desc->flags & NFT_DATA_DESC_SETELEM &&
10864 chain->flags & NFT_CHAIN_BINDING)
10866 if (!nft_use_inc(&chain->use))
10869 data->verdict.chain = chain;
10873 desc->len = sizeof(data->verdict);
10878 static void nft_verdict_uninit(const struct nft_data *data)
10880 struct nft_chain *chain;
10882 switch (data->verdict.code) {
10885 chain = data->verdict.chain;
10886 nft_use_dec(&chain->use);
10891 int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
10893 struct nlattr *nest;
10895 nest = nla_nest_start_noflag(skb, type);
10897 goto nla_put_failure;
10899 if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
10900 goto nla_put_failure;
10905 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
10907 goto nla_put_failure;
10909 nla_nest_end(skb, nest);
10916 static int nft_value_init(const struct nft_ctx *ctx,
10917 struct nft_data *data, struct nft_data_desc *desc,
10918 const struct nlattr *nla)
10922 len = nla_len(nla);
10925 if (len > desc->size)
10928 if (len != desc->len)
10934 nla_memcpy(data->data, nla, len);
10939 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
10942 return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
10945 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
10946 [NFTA_DATA_VALUE] = { .type = NLA_BINARY },
10947 [NFTA_DATA_VERDICT] = { .type = NLA_NESTED },
10951 * nft_data_init - parse nf_tables data netlink attributes
10953 * @ctx: context of the expression using the data
10954 * @data: destination struct nft_data
10955 * @desc: data description
10956 * @nla: netlink attribute containing data
10958 * Parse the netlink data attributes and initialize a struct nft_data.
10959 * The type and length of data are returned in the data description.
10961 * The caller can indicate that it only wants to accept data of type
10962 * NFT_DATA_VALUE by passing NULL for the ctx argument.
10964 int nft_data_init(const struct nft_ctx *ctx, struct nft_data *data,
10965 struct nft_data_desc *desc, const struct nlattr *nla)
10967 struct nlattr *tb[NFTA_DATA_MAX + 1];
10970 if (WARN_ON_ONCE(!desc->size))
10973 err = nla_parse_nested_deprecated(tb, NFTA_DATA_MAX, nla,
10974 nft_data_policy, NULL);
10978 if (tb[NFTA_DATA_VALUE]) {
10979 if (desc->type != NFT_DATA_VALUE)
10982 err = nft_value_init(ctx, data, desc, tb[NFTA_DATA_VALUE]);
10983 } else if (tb[NFTA_DATA_VERDICT] && ctx != NULL) {
10984 if (desc->type != NFT_DATA_VERDICT)
10987 err = nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
10994 EXPORT_SYMBOL_GPL(nft_data_init);
10997 * nft_data_release - release a nft_data item
10999 * @data: struct nft_data to release
11000 * @type: type of data
11002 * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
11003 * all others need to be released by calling this function.
11005 void nft_data_release(const struct nft_data *data, enum nft_data_types type)
11007 if (type < NFT_DATA_VERDICT)
11010 case NFT_DATA_VERDICT:
11011 return nft_verdict_uninit(data);
11016 EXPORT_SYMBOL_GPL(nft_data_release);
11018 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
11019 enum nft_data_types type, unsigned int len)
11021 struct nlattr *nest;
11024 nest = nla_nest_start_noflag(skb, attr);
11029 case NFT_DATA_VALUE:
11030 err = nft_value_dump(skb, data, len);
11032 case NFT_DATA_VERDICT:
11033 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
11040 nla_nest_end(skb, nest);
11043 EXPORT_SYMBOL_GPL(nft_data_dump);
11045 int __nft_release_basechain(struct nft_ctx *ctx)
11047 struct nft_rule *rule, *nr;
11049 if (WARN_ON(!nft_is_base_chain(ctx->chain)))
11052 nf_tables_unregister_hook(ctx->net, ctx->chain->table, ctx->chain);
11053 list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
11054 list_del(&rule->list);
11055 nft_use_dec(&ctx->chain->use);
11056 nf_tables_rule_release(ctx, rule);
11058 nft_chain_del(ctx->chain);
11059 nft_use_dec(&ctx->table->use);
11060 nf_tables_chain_destroy(ctx);
11064 EXPORT_SYMBOL_GPL(__nft_release_basechain);
11066 static void __nft_release_hook(struct net *net, struct nft_table *table)
11068 struct nft_flowtable *flowtable;
11069 struct nft_chain *chain;
11071 list_for_each_entry(chain, &table->chains, list)
11072 __nf_tables_unregister_hook(net, table, chain, true);
11073 list_for_each_entry(flowtable, &table->flowtables, list)
11074 __nft_unregister_flowtable_net_hooks(net, &flowtable->hook_list,
11078 static void __nft_release_hooks(struct net *net)
11080 struct nftables_pernet *nft_net = nft_pernet(net);
11081 struct nft_table *table;
11083 list_for_each_entry(table, &nft_net->tables, list) {
11084 if (nft_table_has_owner(table))
11087 __nft_release_hook(net, table);
11091 static void __nft_release_table(struct net *net, struct nft_table *table)
11093 struct nft_flowtable *flowtable, *nf;
11094 struct nft_chain *chain, *nc;
11095 struct nft_object *obj, *ne;
11096 struct nft_rule *rule, *nr;
11097 struct nft_set *set, *ns;
11098 struct nft_ctx ctx = {
11100 .family = NFPROTO_NETDEV,
11103 ctx.family = table->family;
11105 list_for_each_entry(chain, &table->chains, list) {
11106 if (nft_chain_binding(chain))
11110 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
11111 list_del(&rule->list);
11112 nft_use_dec(&chain->use);
11113 nf_tables_rule_release(&ctx, rule);
11116 list_for_each_entry_safe(flowtable, nf, &table->flowtables, list) {
11117 list_del(&flowtable->list);
11118 nft_use_dec(&table->use);
11119 nf_tables_flowtable_destroy(flowtable);
11121 list_for_each_entry_safe(set, ns, &table->sets, list) {
11122 list_del(&set->list);
11123 nft_use_dec(&table->use);
11124 if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
11125 nft_map_deactivate(&ctx, set);
11127 nft_set_destroy(&ctx, set);
11129 list_for_each_entry_safe(obj, ne, &table->objects, list) {
11131 nft_use_dec(&table->use);
11132 nft_obj_destroy(&ctx, obj);
11134 list_for_each_entry_safe(chain, nc, &table->chains, list) {
11136 nft_chain_del(chain);
11137 nft_use_dec(&table->use);
11138 nf_tables_chain_destroy(&ctx);
11140 nf_tables_table_destroy(&ctx);
11143 static void __nft_release_tables(struct net *net)
11145 struct nftables_pernet *nft_net = nft_pernet(net);
11146 struct nft_table *table, *nt;
11148 list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
11149 if (nft_table_has_owner(table))
11152 list_del(&table->list);
11154 __nft_release_table(net, table);
11158 static int nft_rcv_nl_event(struct notifier_block *this, unsigned long event,
11161 struct nft_table *table, *to_delete[8];
11162 struct nftables_pernet *nft_net;
11163 struct netlink_notify *n = ptr;
11164 struct net *net = n->net;
11165 unsigned int deleted;
11166 bool restart = false;
11167 unsigned int gc_seq;
11169 if (event != NETLINK_URELEASE || n->protocol != NETLINK_NETFILTER)
11170 return NOTIFY_DONE;
11172 nft_net = nft_pernet(net);
11174 mutex_lock(&nft_net->commit_mutex);
11176 gc_seq = nft_gc_seq_begin(nft_net);
11178 if (!list_empty(&nf_tables_destroy_list))
11179 nf_tables_trans_destroy_flush_work();
11181 list_for_each_entry(table, &nft_net->tables, list) {
11182 if (nft_table_has_owner(table) &&
11183 n->portid == table->nlpid) {
11184 __nft_release_hook(net, table);
11185 list_del_rcu(&table->list);
11186 to_delete[deleted++] = table;
11187 if (deleted >= ARRAY_SIZE(to_delete))
11192 restart = deleted >= ARRAY_SIZE(to_delete);
11195 __nft_release_table(net, to_delete[--deleted]);
11200 nft_gc_seq_end(nft_net, gc_seq);
11202 mutex_unlock(&nft_net->commit_mutex);
11204 return NOTIFY_DONE;
11207 static struct notifier_block nft_nl_notifier = {
11208 .notifier_call = nft_rcv_nl_event,
11211 static int __net_init nf_tables_init_net(struct net *net)
11213 struct nftables_pernet *nft_net = nft_pernet(net);
11215 INIT_LIST_HEAD(&nft_net->tables);
11216 INIT_LIST_HEAD(&nft_net->commit_list);
11217 INIT_LIST_HEAD(&nft_net->binding_list);
11218 INIT_LIST_HEAD(&nft_net->module_list);
11219 INIT_LIST_HEAD(&nft_net->notify_list);
11220 mutex_init(&nft_net->commit_mutex);
11221 nft_net->base_seq = 1;
11222 nft_net->gc_seq = 0;
11223 nft_net->validate_state = NFT_VALIDATE_SKIP;
11228 static void __net_exit nf_tables_pre_exit_net(struct net *net)
11230 struct nftables_pernet *nft_net = nft_pernet(net);
11232 mutex_lock(&nft_net->commit_mutex);
11233 __nft_release_hooks(net);
11234 mutex_unlock(&nft_net->commit_mutex);
11237 static void __net_exit nf_tables_exit_net(struct net *net)
11239 struct nftables_pernet *nft_net = nft_pernet(net);
11240 unsigned int gc_seq;
11242 mutex_lock(&nft_net->commit_mutex);
11244 gc_seq = nft_gc_seq_begin(nft_net);
11246 if (!list_empty(&nft_net->commit_list) ||
11247 !list_empty(&nft_net->module_list))
11248 __nf_tables_abort(net, NFNL_ABORT_NONE);
11250 __nft_release_tables(net);
11252 nft_gc_seq_end(nft_net, gc_seq);
11254 mutex_unlock(&nft_net->commit_mutex);
11255 WARN_ON_ONCE(!list_empty(&nft_net->tables));
11256 WARN_ON_ONCE(!list_empty(&nft_net->module_list));
11257 WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
11260 static void nf_tables_exit_batch(struct list_head *net_exit_list)
11262 flush_work(&trans_gc_work);
11265 static struct pernet_operations nf_tables_net_ops = {
11266 .init = nf_tables_init_net,
11267 .pre_exit = nf_tables_pre_exit_net,
11268 .exit = nf_tables_exit_net,
11269 .exit_batch = nf_tables_exit_batch,
11270 .id = &nf_tables_net_id,
11271 .size = sizeof(struct nftables_pernet),
11274 static int __init nf_tables_module_init(void)
11278 err = register_pernet_subsys(&nf_tables_net_ops);
11282 err = nft_chain_filter_init();
11284 goto err_chain_filter;
11286 err = nf_tables_core_module_init();
11288 goto err_core_module;
11290 err = register_netdevice_notifier(&nf_tables_flowtable_notifier);
11292 goto err_netdev_notifier;
11294 err = rhltable_init(&nft_objname_ht, &nft_objname_ht_params);
11296 goto err_rht_objname;
11298 err = nft_offload_init();
11302 err = netlink_register_notifier(&nft_nl_notifier);
11304 goto err_netlink_notifier;
11307 err = nfnetlink_subsys_register(&nf_tables_subsys);
11309 goto err_nfnl_subsys;
11311 nft_chain_route_init();
11316 netlink_unregister_notifier(&nft_nl_notifier);
11317 err_netlink_notifier:
11318 nft_offload_exit();
11320 rhltable_destroy(&nft_objname_ht);
11322 unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
11323 err_netdev_notifier:
11324 nf_tables_core_module_exit();
11326 nft_chain_filter_fini();
11328 unregister_pernet_subsys(&nf_tables_net_ops);
11332 static void __exit nf_tables_module_exit(void)
11334 nfnetlink_subsys_unregister(&nf_tables_subsys);
11335 netlink_unregister_notifier(&nft_nl_notifier);
11336 nft_offload_exit();
11337 unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
11338 nft_chain_filter_fini();
11339 nft_chain_route_fini();
11340 unregister_pernet_subsys(&nf_tables_net_ops);
11341 cancel_work_sync(&trans_gc_work);
11342 cancel_work_sync(&trans_destroy_work);
11344 rhltable_destroy(&nft_objname_ht);
11345 nf_tables_core_module_exit();
11348 module_init(nf_tables_module_init);
11349 module_exit(nf_tables_module_exit);
11351 MODULE_LICENSE("GPL");
11352 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
11353 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);