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,
107 static void nft_validate_state_update(struct nft_table *table, u8 new_validate_state)
109 switch (table->validate_state) {
110 case NFT_VALIDATE_SKIP:
111 WARN_ON_ONCE(new_validate_state == NFT_VALIDATE_DO);
113 case NFT_VALIDATE_NEED:
115 case NFT_VALIDATE_DO:
116 if (new_validate_state == NFT_VALIDATE_NEED)
120 table->validate_state = new_validate_state;
122 static void nf_tables_trans_destroy_work(struct work_struct *w);
123 static DECLARE_WORK(trans_destroy_work, nf_tables_trans_destroy_work);
125 static void nft_trans_gc_work(struct work_struct *work);
126 static DECLARE_WORK(trans_gc_work, nft_trans_gc_work);
128 static void nft_ctx_init(struct nft_ctx *ctx,
130 const struct sk_buff *skb,
131 const struct nlmsghdr *nlh,
133 struct nft_table *table,
134 struct nft_chain *chain,
135 const struct nlattr * const *nla)
138 ctx->family = family;
143 ctx->portid = NETLINK_CB(skb).portid;
144 ctx->report = nlmsg_report(nlh);
145 ctx->flags = nlh->nlmsg_flags;
146 ctx->seq = nlh->nlmsg_seq;
149 static struct nft_trans *nft_trans_alloc_gfp(const struct nft_ctx *ctx,
150 int msg_type, u32 size, gfp_t gfp)
152 struct nft_trans *trans;
154 trans = kzalloc(sizeof(struct nft_trans) + size, gfp);
158 INIT_LIST_HEAD(&trans->list);
159 INIT_LIST_HEAD(&trans->binding_list);
160 trans->msg_type = msg_type;
166 static struct nft_trans *nft_trans_alloc(const struct nft_ctx *ctx,
167 int msg_type, u32 size)
169 return nft_trans_alloc_gfp(ctx, msg_type, size, GFP_KERNEL);
172 static void nft_trans_list_del(struct nft_trans *trans)
174 list_del(&trans->list);
175 list_del(&trans->binding_list);
178 static void nft_trans_destroy(struct nft_trans *trans)
180 nft_trans_list_del(trans);
184 static void __nft_set_trans_bind(const struct nft_ctx *ctx, struct nft_set *set,
187 struct nftables_pernet *nft_net;
188 struct net *net = ctx->net;
189 struct nft_trans *trans;
191 if (!nft_set_is_anonymous(set))
194 nft_net = nft_pernet(net);
195 list_for_each_entry_reverse(trans, &nft_net->commit_list, list) {
196 switch (trans->msg_type) {
198 if (nft_trans_set(trans) == set)
199 nft_trans_set_bound(trans) = bind;
201 case NFT_MSG_NEWSETELEM:
202 if (nft_trans_elem_set(trans) == set)
203 nft_trans_elem_set_bound(trans) = bind;
209 static void nft_set_trans_bind(const struct nft_ctx *ctx, struct nft_set *set)
211 return __nft_set_trans_bind(ctx, set, true);
214 static void nft_set_trans_unbind(const struct nft_ctx *ctx, struct nft_set *set)
216 return __nft_set_trans_bind(ctx, set, false);
219 static void __nft_chain_trans_bind(const struct nft_ctx *ctx,
220 struct nft_chain *chain, bool bind)
222 struct nftables_pernet *nft_net;
223 struct net *net = ctx->net;
224 struct nft_trans *trans;
226 if (!nft_chain_binding(chain))
229 nft_net = nft_pernet(net);
230 list_for_each_entry_reverse(trans, &nft_net->commit_list, list) {
231 switch (trans->msg_type) {
232 case NFT_MSG_NEWCHAIN:
233 if (nft_trans_chain(trans) == chain)
234 nft_trans_chain_bound(trans) = bind;
236 case NFT_MSG_NEWRULE:
237 if (trans->ctx.chain == chain)
238 nft_trans_rule_bound(trans) = bind;
244 static void nft_chain_trans_bind(const struct nft_ctx *ctx,
245 struct nft_chain *chain)
247 __nft_chain_trans_bind(ctx, chain, true);
250 int nf_tables_bind_chain(const struct nft_ctx *ctx, struct nft_chain *chain)
252 if (!nft_chain_binding(chain))
255 if (nft_chain_binding(ctx->chain))
261 if (!nft_use_inc(&chain->use))
265 nft_chain_trans_bind(ctx, chain);
270 void nf_tables_unbind_chain(const struct nft_ctx *ctx, struct nft_chain *chain)
272 __nft_chain_trans_bind(ctx, chain, false);
275 static int nft_netdev_register_hooks(struct net *net,
276 struct list_head *hook_list)
278 struct nft_hook *hook;
282 list_for_each_entry(hook, hook_list, list) {
283 err = nf_register_net_hook(net, &hook->ops);
292 list_for_each_entry(hook, hook_list, list) {
296 nf_unregister_net_hook(net, &hook->ops);
301 static void nft_netdev_unregister_hooks(struct net *net,
302 struct list_head *hook_list,
305 struct nft_hook *hook, *next;
307 list_for_each_entry_safe(hook, next, hook_list, list) {
308 nf_unregister_net_hook(net, &hook->ops);
309 if (release_netdev) {
310 list_del(&hook->list);
311 kfree_rcu(hook, rcu);
316 static int nf_tables_register_hook(struct net *net,
317 const struct nft_table *table,
318 struct nft_chain *chain)
320 struct nft_base_chain *basechain;
321 const struct nf_hook_ops *ops;
323 if (table->flags & NFT_TABLE_F_DORMANT ||
324 !nft_is_base_chain(chain))
327 basechain = nft_base_chain(chain);
328 ops = &basechain->ops;
330 if (basechain->type->ops_register)
331 return basechain->type->ops_register(net, ops);
333 if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
334 return nft_netdev_register_hooks(net, &basechain->hook_list);
336 return nf_register_net_hook(net, &basechain->ops);
339 static void __nf_tables_unregister_hook(struct net *net,
340 const struct nft_table *table,
341 struct nft_chain *chain,
344 struct nft_base_chain *basechain;
345 const struct nf_hook_ops *ops;
347 if (table->flags & NFT_TABLE_F_DORMANT ||
348 !nft_is_base_chain(chain))
350 basechain = nft_base_chain(chain);
351 ops = &basechain->ops;
353 if (basechain->type->ops_unregister)
354 return basechain->type->ops_unregister(net, ops);
356 if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
357 nft_netdev_unregister_hooks(net, &basechain->hook_list,
360 nf_unregister_net_hook(net, &basechain->ops);
363 static void nf_tables_unregister_hook(struct net *net,
364 const struct nft_table *table,
365 struct nft_chain *chain)
367 return __nf_tables_unregister_hook(net, table, chain, false);
370 static void nft_trans_commit_list_add_tail(struct net *net, struct nft_trans *trans)
372 struct nftables_pernet *nft_net = nft_pernet(net);
374 switch (trans->msg_type) {
376 if (!nft_trans_set_update(trans) &&
377 nft_set_is_anonymous(nft_trans_set(trans)))
378 list_add_tail(&trans->binding_list, &nft_net->binding_list);
380 case NFT_MSG_NEWCHAIN:
381 if (!nft_trans_chain_update(trans) &&
382 nft_chain_binding(nft_trans_chain(trans)))
383 list_add_tail(&trans->binding_list, &nft_net->binding_list);
387 list_add_tail(&trans->list, &nft_net->commit_list);
390 static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type)
392 struct nft_trans *trans;
394 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table));
398 if (msg_type == NFT_MSG_NEWTABLE)
399 nft_activate_next(ctx->net, ctx->table);
401 nft_trans_commit_list_add_tail(ctx->net, trans);
405 static int nft_deltable(struct nft_ctx *ctx)
409 err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE);
413 nft_deactivate_next(ctx->net, ctx->table);
417 static struct nft_trans *nft_trans_chain_add(struct nft_ctx *ctx, int msg_type)
419 struct nft_trans *trans;
421 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain));
423 return ERR_PTR(-ENOMEM);
425 if (msg_type == NFT_MSG_NEWCHAIN) {
426 nft_activate_next(ctx->net, ctx->chain);
428 if (ctx->nla[NFTA_CHAIN_ID]) {
429 nft_trans_chain_id(trans) =
430 ntohl(nla_get_be32(ctx->nla[NFTA_CHAIN_ID]));
433 nft_trans_chain(trans) = ctx->chain;
434 nft_trans_commit_list_add_tail(ctx->net, trans);
439 static int nft_delchain(struct nft_ctx *ctx)
441 struct nft_trans *trans;
443 trans = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN);
445 return PTR_ERR(trans);
447 nft_use_dec(&ctx->table->use);
448 nft_deactivate_next(ctx->net, ctx->chain);
453 void nft_rule_expr_activate(const struct nft_ctx *ctx, struct nft_rule *rule)
455 struct nft_expr *expr;
457 expr = nft_expr_first(rule);
458 while (nft_expr_more(rule, expr)) {
459 if (expr->ops->activate)
460 expr->ops->activate(ctx, expr);
462 expr = nft_expr_next(expr);
466 void nft_rule_expr_deactivate(const struct nft_ctx *ctx, struct nft_rule *rule,
467 enum nft_trans_phase phase)
469 struct nft_expr *expr;
471 expr = nft_expr_first(rule);
472 while (nft_expr_more(rule, expr)) {
473 if (expr->ops->deactivate)
474 expr->ops->deactivate(ctx, expr, phase);
476 expr = nft_expr_next(expr);
481 nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule)
483 /* You cannot delete the same rule twice */
484 if (nft_is_active_next(ctx->net, rule)) {
485 nft_deactivate_next(ctx->net, rule);
486 nft_use_dec(&ctx->chain->use);
492 static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type,
493 struct nft_rule *rule)
495 struct nft_trans *trans;
497 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule));
501 if (msg_type == NFT_MSG_NEWRULE && ctx->nla[NFTA_RULE_ID] != NULL) {
502 nft_trans_rule_id(trans) =
503 ntohl(nla_get_be32(ctx->nla[NFTA_RULE_ID]));
505 nft_trans_rule(trans) = rule;
506 nft_trans_commit_list_add_tail(ctx->net, trans);
511 static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule)
513 struct nft_flow_rule *flow;
514 struct nft_trans *trans;
517 trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule);
521 if (ctx->chain->flags & NFT_CHAIN_HW_OFFLOAD) {
522 flow = nft_flow_rule_create(ctx->net, rule);
524 nft_trans_destroy(trans);
525 return PTR_ERR(flow);
528 nft_trans_flow_rule(trans) = flow;
531 err = nf_tables_delrule_deactivate(ctx, rule);
533 nft_trans_destroy(trans);
536 nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_PREPARE);
541 static int nft_delrule_by_chain(struct nft_ctx *ctx)
543 struct nft_rule *rule;
546 list_for_each_entry(rule, &ctx->chain->rules, list) {
547 if (!nft_is_active_next(ctx->net, rule))
550 err = nft_delrule(ctx, rule);
557 static int __nft_trans_set_add(const struct nft_ctx *ctx, int msg_type,
559 const struct nft_set_desc *desc)
561 struct nft_trans *trans;
563 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
567 if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] && !desc) {
568 nft_trans_set_id(trans) =
569 ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
570 nft_activate_next(ctx->net, set);
572 nft_trans_set(trans) = set;
574 nft_trans_set_update(trans) = true;
575 nft_trans_set_gc_int(trans) = desc->gc_int;
576 nft_trans_set_timeout(trans) = desc->timeout;
577 nft_trans_set_size(trans) = desc->size;
579 nft_trans_commit_list_add_tail(ctx->net, trans);
584 static int nft_trans_set_add(const struct nft_ctx *ctx, int msg_type,
587 return __nft_trans_set_add(ctx, msg_type, set, NULL);
590 static int nft_mapelem_deactivate(const struct nft_ctx *ctx,
592 const struct nft_set_iter *iter,
593 struct nft_set_elem *elem)
595 nft_setelem_data_deactivate(ctx->net, set, elem);
600 struct nft_set_elem_catchall {
601 struct list_head list;
606 static void nft_map_catchall_deactivate(const struct nft_ctx *ctx,
609 u8 genmask = nft_genmask_next(ctx->net);
610 struct nft_set_elem_catchall *catchall;
611 struct nft_set_elem elem;
612 struct nft_set_ext *ext;
614 list_for_each_entry(catchall, &set->catchall_list, list) {
615 ext = nft_set_elem_ext(set, catchall->elem);
616 if (!nft_set_elem_active(ext, genmask))
619 elem.priv = catchall->elem;
620 nft_setelem_data_deactivate(ctx->net, set, &elem);
625 static void nft_map_deactivate(const struct nft_ctx *ctx, struct nft_set *set)
627 struct nft_set_iter iter = {
628 .genmask = nft_genmask_next(ctx->net),
629 .fn = nft_mapelem_deactivate,
632 set->ops->walk(ctx, set, &iter);
633 WARN_ON_ONCE(iter.err);
635 nft_map_catchall_deactivate(ctx, set);
638 static int nft_delset(const struct nft_ctx *ctx, struct nft_set *set)
642 err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set);
646 if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
647 nft_map_deactivate(ctx, set);
649 nft_deactivate_next(ctx->net, set);
650 nft_use_dec(&ctx->table->use);
655 static int nft_trans_obj_add(struct nft_ctx *ctx, int msg_type,
656 struct nft_object *obj)
658 struct nft_trans *trans;
660 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_obj));
664 if (msg_type == NFT_MSG_NEWOBJ)
665 nft_activate_next(ctx->net, obj);
667 nft_trans_obj(trans) = obj;
668 nft_trans_commit_list_add_tail(ctx->net, trans);
673 static int nft_delobj(struct nft_ctx *ctx, struct nft_object *obj)
677 err = nft_trans_obj_add(ctx, NFT_MSG_DELOBJ, obj);
681 nft_deactivate_next(ctx->net, obj);
682 nft_use_dec(&ctx->table->use);
687 static int nft_trans_flowtable_add(struct nft_ctx *ctx, int msg_type,
688 struct nft_flowtable *flowtable)
690 struct nft_trans *trans;
692 trans = nft_trans_alloc(ctx, msg_type,
693 sizeof(struct nft_trans_flowtable));
697 if (msg_type == NFT_MSG_NEWFLOWTABLE)
698 nft_activate_next(ctx->net, flowtable);
700 INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
701 nft_trans_flowtable(trans) = flowtable;
702 nft_trans_commit_list_add_tail(ctx->net, trans);
707 static int nft_delflowtable(struct nft_ctx *ctx,
708 struct nft_flowtable *flowtable)
712 err = nft_trans_flowtable_add(ctx, NFT_MSG_DELFLOWTABLE, flowtable);
716 nft_deactivate_next(ctx->net, flowtable);
717 nft_use_dec(&ctx->table->use);
722 static void __nft_reg_track_clobber(struct nft_regs_track *track, u8 dreg)
726 for (i = track->regs[dreg].num_reg; i > 0; i--)
727 __nft_reg_track_cancel(track, dreg - i);
730 static void __nft_reg_track_update(struct nft_regs_track *track,
731 const struct nft_expr *expr,
734 track->regs[dreg].selector = expr;
735 track->regs[dreg].bitwise = NULL;
736 track->regs[dreg].num_reg = num_reg;
739 void nft_reg_track_update(struct nft_regs_track *track,
740 const struct nft_expr *expr, u8 dreg, u8 len)
742 unsigned int regcount;
745 __nft_reg_track_clobber(track, dreg);
747 regcount = DIV_ROUND_UP(len, NFT_REG32_SIZE);
748 for (i = 0; i < regcount; i++, dreg++)
749 __nft_reg_track_update(track, expr, dreg, i);
751 EXPORT_SYMBOL_GPL(nft_reg_track_update);
753 void nft_reg_track_cancel(struct nft_regs_track *track, u8 dreg, u8 len)
755 unsigned int regcount;
758 __nft_reg_track_clobber(track, dreg);
760 regcount = DIV_ROUND_UP(len, NFT_REG32_SIZE);
761 for (i = 0; i < regcount; i++, dreg++)
762 __nft_reg_track_cancel(track, dreg);
764 EXPORT_SYMBOL_GPL(nft_reg_track_cancel);
766 void __nft_reg_track_cancel(struct nft_regs_track *track, u8 dreg)
768 track->regs[dreg].selector = NULL;
769 track->regs[dreg].bitwise = NULL;
770 track->regs[dreg].num_reg = 0;
772 EXPORT_SYMBOL_GPL(__nft_reg_track_cancel);
778 static struct nft_table *nft_table_lookup(const struct net *net,
779 const struct nlattr *nla,
780 u8 family, u8 genmask, u32 nlpid)
782 struct nftables_pernet *nft_net;
783 struct nft_table *table;
786 return ERR_PTR(-EINVAL);
788 nft_net = nft_pernet(net);
789 list_for_each_entry_rcu(table, &nft_net->tables, list,
790 lockdep_is_held(&nft_net->commit_mutex)) {
791 if (!nla_strcmp(nla, table->name) &&
792 table->family == family &&
793 nft_active_genmask(table, genmask)) {
794 if (nft_table_has_owner(table) &&
795 nlpid && table->nlpid != nlpid)
796 return ERR_PTR(-EPERM);
802 return ERR_PTR(-ENOENT);
805 static struct nft_table *nft_table_lookup_byhandle(const struct net *net,
806 const struct nlattr *nla,
807 u8 genmask, u32 nlpid)
809 struct nftables_pernet *nft_net;
810 struct nft_table *table;
812 nft_net = nft_pernet(net);
813 list_for_each_entry(table, &nft_net->tables, list) {
814 if (be64_to_cpu(nla_get_be64(nla)) == table->handle &&
815 nft_active_genmask(table, genmask)) {
816 if (nft_table_has_owner(table) &&
817 nlpid && table->nlpid != nlpid)
818 return ERR_PTR(-EPERM);
824 return ERR_PTR(-ENOENT);
827 static inline u64 nf_tables_alloc_handle(struct nft_table *table)
829 return ++table->hgenerator;
832 static const struct nft_chain_type *chain_type[NFPROTO_NUMPROTO][NFT_CHAIN_T_MAX];
834 static const struct nft_chain_type *
835 __nft_chain_type_get(u8 family, enum nft_chain_types type)
837 if (family >= NFPROTO_NUMPROTO ||
838 type >= NFT_CHAIN_T_MAX)
841 return chain_type[family][type];
844 static const struct nft_chain_type *
845 __nf_tables_chain_type_lookup(const struct nlattr *nla, u8 family)
847 const struct nft_chain_type *type;
850 for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
851 type = __nft_chain_type_get(family, i);
854 if (!nla_strcmp(nla, type->name))
860 struct nft_module_request {
861 struct list_head list;
862 char module[MODULE_NAME_LEN];
866 #ifdef CONFIG_MODULES
867 __printf(2, 3) int nft_request_module(struct net *net, const char *fmt,
870 char module_name[MODULE_NAME_LEN];
871 struct nftables_pernet *nft_net;
872 struct nft_module_request *req;
877 ret = vsnprintf(module_name, MODULE_NAME_LEN, fmt, args);
879 if (ret >= MODULE_NAME_LEN)
882 nft_net = nft_pernet(net);
883 list_for_each_entry(req, &nft_net->module_list, list) {
884 if (!strcmp(req->module, module_name)) {
888 /* A request to load this module already exists. */
893 req = kmalloc(sizeof(*req), GFP_KERNEL);
898 strscpy(req->module, module_name, MODULE_NAME_LEN);
899 list_add_tail(&req->list, &nft_net->module_list);
903 EXPORT_SYMBOL_GPL(nft_request_module);
906 static void lockdep_nfnl_nft_mutex_not_held(void)
908 #ifdef CONFIG_PROVE_LOCKING
910 WARN_ON_ONCE(lockdep_nfnl_is_held(NFNL_SUBSYS_NFTABLES));
914 static const struct nft_chain_type *
915 nf_tables_chain_type_lookup(struct net *net, const struct nlattr *nla,
916 u8 family, bool autoload)
918 const struct nft_chain_type *type;
920 type = __nf_tables_chain_type_lookup(nla, family);
924 lockdep_nfnl_nft_mutex_not_held();
925 #ifdef CONFIG_MODULES
927 if (nft_request_module(net, "nft-chain-%u-%.*s", family,
929 (const char *)nla_data(nla)) == -EAGAIN)
930 return ERR_PTR(-EAGAIN);
933 return ERR_PTR(-ENOENT);
936 static __be16 nft_base_seq(const struct net *net)
938 struct nftables_pernet *nft_net = nft_pernet(net);
940 return htons(nft_net->base_seq & 0xffff);
943 static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
944 [NFTA_TABLE_NAME] = { .type = NLA_STRING,
945 .len = NFT_TABLE_MAXNAMELEN - 1 },
946 [NFTA_TABLE_FLAGS] = { .type = NLA_U32 },
947 [NFTA_TABLE_HANDLE] = { .type = NLA_U64 },
948 [NFTA_TABLE_USERDATA] = { .type = NLA_BINARY,
949 .len = NFT_USERDATA_MAXLEN }
952 static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
953 u32 portid, u32 seq, int event, u32 flags,
954 int family, const struct nft_table *table)
956 struct nlmsghdr *nlh;
958 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
959 nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
960 NFNETLINK_V0, nft_base_seq(net));
962 goto nla_put_failure;
964 if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
965 nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)) ||
966 nla_put_be64(skb, NFTA_TABLE_HANDLE, cpu_to_be64(table->handle),
968 goto nla_put_failure;
970 if (event == NFT_MSG_DELTABLE) {
975 if (nla_put_be32(skb, NFTA_TABLE_FLAGS,
976 htonl(table->flags & NFT_TABLE_F_MASK)))
977 goto nla_put_failure;
979 if (nft_table_has_owner(table) &&
980 nla_put_be32(skb, NFTA_TABLE_OWNER, htonl(table->nlpid)))
981 goto nla_put_failure;
984 if (nla_put(skb, NFTA_TABLE_USERDATA, table->udlen, table->udata))
985 goto nla_put_failure;
992 nlmsg_trim(skb, nlh);
996 struct nftnl_skb_parms {
999 #define NFT_CB(skb) (*(struct nftnl_skb_parms*)&((skb)->cb))
1001 static void nft_notify_enqueue(struct sk_buff *skb, bool report,
1002 struct list_head *notify_list)
1004 NFT_CB(skb).report = report;
1005 list_add_tail(&skb->list, notify_list);
1008 static void nf_tables_table_notify(const struct nft_ctx *ctx, int event)
1010 struct nftables_pernet *nft_net;
1011 struct sk_buff *skb;
1016 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1019 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1023 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
1024 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
1026 err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
1027 event, flags, ctx->family, ctx->table);
1033 nft_net = nft_pernet(ctx->net);
1034 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
1037 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
1040 static int nf_tables_dump_tables(struct sk_buff *skb,
1041 struct netlink_callback *cb)
1043 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1044 struct nftables_pernet *nft_net;
1045 const struct nft_table *table;
1046 unsigned int idx = 0, s_idx = cb->args[0];
1047 struct net *net = sock_net(skb->sk);
1048 int family = nfmsg->nfgen_family;
1051 nft_net = nft_pernet(net);
1052 cb->seq = READ_ONCE(nft_net->base_seq);
1054 list_for_each_entry_rcu(table, &nft_net->tables, list) {
1055 if (family != NFPROTO_UNSPEC && family != table->family)
1061 memset(&cb->args[1], 0,
1062 sizeof(cb->args) - sizeof(cb->args[0]));
1063 if (!nft_is_active(net, table))
1065 if (nf_tables_fill_table_info(skb, net,
1066 NETLINK_CB(cb->skb).portid,
1068 NFT_MSG_NEWTABLE, NLM_F_MULTI,
1069 table->family, table) < 0)
1072 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1082 static int nft_netlink_dump_start_rcu(struct sock *nlsk, struct sk_buff *skb,
1083 const struct nlmsghdr *nlh,
1084 struct netlink_dump_control *c)
1088 if (!try_module_get(THIS_MODULE))
1092 err = netlink_dump_start(nlsk, skb, nlh, c);
1094 module_put(THIS_MODULE);
1099 /* called with rcu_read_lock held */
1100 static int nf_tables_gettable(struct sk_buff *skb, const struct nfnl_info *info,
1101 const struct nlattr * const nla[])
1103 struct netlink_ext_ack *extack = info->extack;
1104 u8 genmask = nft_genmask_cur(info->net);
1105 u8 family = info->nfmsg->nfgen_family;
1106 const struct nft_table *table;
1107 struct net *net = info->net;
1108 struct sk_buff *skb2;
1111 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
1112 struct netlink_dump_control c = {
1113 .dump = nf_tables_dump_tables,
1114 .module = THIS_MODULE,
1117 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
1120 table = nft_table_lookup(net, nla[NFTA_TABLE_NAME], family, genmask, 0);
1121 if (IS_ERR(table)) {
1122 NL_SET_BAD_ATTR(extack, nla[NFTA_TABLE_NAME]);
1123 return PTR_ERR(table);
1126 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1130 err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
1131 info->nlh->nlmsg_seq, NFT_MSG_NEWTABLE,
1134 goto err_fill_table_info;
1136 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
1138 err_fill_table_info:
1143 static void nft_table_disable(struct net *net, struct nft_table *table, u32 cnt)
1145 struct nft_chain *chain;
1148 list_for_each_entry(chain, &table->chains, list) {
1149 if (!nft_is_active_next(net, chain))
1151 if (!nft_is_base_chain(chain))
1154 if (cnt && i++ == cnt)
1157 nf_tables_unregister_hook(net, table, chain);
1161 static int nf_tables_table_enable(struct net *net, struct nft_table *table)
1163 struct nft_chain *chain;
1166 list_for_each_entry(chain, &table->chains, list) {
1167 if (!nft_is_active_next(net, chain))
1169 if (!nft_is_base_chain(chain))
1172 err = nf_tables_register_hook(net, table, chain);
1174 goto err_register_hooks;
1182 nft_table_disable(net, table, i);
1186 static void nf_tables_table_disable(struct net *net, struct nft_table *table)
1188 table->flags &= ~NFT_TABLE_F_DORMANT;
1189 nft_table_disable(net, table, 0);
1190 table->flags |= NFT_TABLE_F_DORMANT;
1193 #define __NFT_TABLE_F_INTERNAL (NFT_TABLE_F_MASK + 1)
1194 #define __NFT_TABLE_F_WAS_DORMANT (__NFT_TABLE_F_INTERNAL << 0)
1195 #define __NFT_TABLE_F_WAS_AWAKEN (__NFT_TABLE_F_INTERNAL << 1)
1196 #define __NFT_TABLE_F_UPDATE (__NFT_TABLE_F_WAS_DORMANT | \
1197 __NFT_TABLE_F_WAS_AWAKEN)
1199 static int nf_tables_updtable(struct nft_ctx *ctx)
1201 struct nft_trans *trans;
1205 if (!ctx->nla[NFTA_TABLE_FLAGS])
1208 flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
1209 if (flags & ~NFT_TABLE_F_MASK)
1212 if (flags == ctx->table->flags)
1215 if ((nft_table_has_owner(ctx->table) &&
1216 !(flags & NFT_TABLE_F_OWNER)) ||
1217 (!nft_table_has_owner(ctx->table) &&
1218 flags & NFT_TABLE_F_OWNER))
1221 trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
1222 sizeof(struct nft_trans_table));
1226 if ((flags & NFT_TABLE_F_DORMANT) &&
1227 !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
1228 ctx->table->flags |= NFT_TABLE_F_DORMANT;
1229 if (!(ctx->table->flags & __NFT_TABLE_F_UPDATE))
1230 ctx->table->flags |= __NFT_TABLE_F_WAS_AWAKEN;
1231 } else 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 ret = nf_tables_table_enable(ctx->net, ctx->table);
1237 goto err_register_hooks;
1239 ctx->table->flags |= __NFT_TABLE_F_WAS_DORMANT;
1243 nft_trans_table_update(trans) = true;
1244 nft_trans_commit_list_add_tail(ctx->net, trans);
1249 nft_trans_destroy(trans);
1253 static u32 nft_chain_hash(const void *data, u32 len, u32 seed)
1255 const char *name = data;
1257 return jhash(name, strlen(name), seed);
1260 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed)
1262 const struct nft_chain *chain = data;
1264 return nft_chain_hash(chain->name, 0, seed);
1267 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *arg,
1270 const struct nft_chain *chain = ptr;
1271 const char *name = arg->key;
1273 return strcmp(chain->name, name);
1276 static u32 nft_objname_hash(const void *data, u32 len, u32 seed)
1278 const struct nft_object_hash_key *k = data;
1280 seed ^= hash_ptr(k->table, 32);
1282 return jhash(k->name, strlen(k->name), seed);
1285 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed)
1287 const struct nft_object *obj = data;
1289 return nft_objname_hash(&obj->key, 0, seed);
1292 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *arg,
1295 const struct nft_object_hash_key *k = arg->key;
1296 const struct nft_object *obj = ptr;
1298 if (obj->key.table != k->table)
1301 return strcmp(obj->key.name, k->name);
1304 static bool nft_supported_family(u8 family)
1307 #ifdef CONFIG_NF_TABLES_INET
1308 || family == NFPROTO_INET
1310 #ifdef CONFIG_NF_TABLES_IPV4
1311 || family == NFPROTO_IPV4
1313 #ifdef CONFIG_NF_TABLES_ARP
1314 || family == NFPROTO_ARP
1316 #ifdef CONFIG_NF_TABLES_NETDEV
1317 || family == NFPROTO_NETDEV
1319 #if IS_ENABLED(CONFIG_NF_TABLES_BRIDGE)
1320 || family == NFPROTO_BRIDGE
1322 #ifdef CONFIG_NF_TABLES_IPV6
1323 || family == NFPROTO_IPV6
1328 static int nf_tables_newtable(struct sk_buff *skb, const struct nfnl_info *info,
1329 const struct nlattr * const nla[])
1331 struct nftables_pernet *nft_net = nft_pernet(info->net);
1332 struct netlink_ext_ack *extack = info->extack;
1333 u8 genmask = nft_genmask_next(info->net);
1334 u8 family = info->nfmsg->nfgen_family;
1335 struct net *net = info->net;
1336 const struct nlattr *attr;
1337 struct nft_table *table;
1342 if (!nft_supported_family(family))
1345 lockdep_assert_held(&nft_net->commit_mutex);
1346 attr = nla[NFTA_TABLE_NAME];
1347 table = nft_table_lookup(net, attr, family, genmask,
1348 NETLINK_CB(skb).portid);
1349 if (IS_ERR(table)) {
1350 if (PTR_ERR(table) != -ENOENT)
1351 return PTR_ERR(table);
1353 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
1354 NL_SET_BAD_ATTR(extack, attr);
1357 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
1360 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
1362 return nf_tables_updtable(&ctx);
1365 if (nla[NFTA_TABLE_FLAGS]) {
1366 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
1367 if (flags & ~NFT_TABLE_F_MASK)
1372 table = kzalloc(sizeof(*table), GFP_KERNEL_ACCOUNT);
1376 table->validate_state = nft_net->validate_state;
1377 table->name = nla_strdup(attr, GFP_KERNEL_ACCOUNT);
1378 if (table->name == NULL)
1381 if (nla[NFTA_TABLE_USERDATA]) {
1382 table->udata = nla_memdup(nla[NFTA_TABLE_USERDATA], GFP_KERNEL_ACCOUNT);
1383 if (table->udata == NULL)
1384 goto err_table_udata;
1386 table->udlen = nla_len(nla[NFTA_TABLE_USERDATA]);
1389 err = rhltable_init(&table->chains_ht, &nft_chain_ht_params);
1393 INIT_LIST_HEAD(&table->chains);
1394 INIT_LIST_HEAD(&table->sets);
1395 INIT_LIST_HEAD(&table->objects);
1396 INIT_LIST_HEAD(&table->flowtables);
1397 table->family = family;
1398 table->flags = flags;
1399 table->handle = ++nft_net->table_handle;
1400 if (table->flags & NFT_TABLE_F_OWNER)
1401 table->nlpid = NETLINK_CB(skb).portid;
1403 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
1404 err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
1408 list_add_tail_rcu(&table->list, &nft_net->tables);
1411 rhltable_destroy(&table->chains_ht);
1413 kfree(table->udata);
1422 static int nft_flush_table(struct nft_ctx *ctx)
1424 struct nft_flowtable *flowtable, *nft;
1425 struct nft_chain *chain, *nc;
1426 struct nft_object *obj, *ne;
1427 struct nft_set *set, *ns;
1430 list_for_each_entry(chain, &ctx->table->chains, list) {
1431 if (!nft_is_active_next(ctx->net, chain))
1434 if (nft_chain_is_bound(chain))
1439 err = nft_delrule_by_chain(ctx);
1444 list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
1445 if (!nft_is_active_next(ctx->net, set))
1448 if (nft_set_is_anonymous(set) &&
1449 !list_empty(&set->bindings))
1452 err = nft_delset(ctx, set);
1457 list_for_each_entry_safe(flowtable, nft, &ctx->table->flowtables, list) {
1458 if (!nft_is_active_next(ctx->net, flowtable))
1461 err = nft_delflowtable(ctx, flowtable);
1466 list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) {
1467 if (!nft_is_active_next(ctx->net, obj))
1470 err = nft_delobj(ctx, obj);
1475 list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
1476 if (!nft_is_active_next(ctx->net, chain))
1479 if (nft_chain_is_bound(chain))
1484 err = nft_delchain(ctx);
1489 err = nft_deltable(ctx);
1494 static int nft_flush(struct nft_ctx *ctx, int family)
1496 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
1497 const struct nlattr * const *nla = ctx->nla;
1498 struct nft_table *table, *nt;
1501 list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
1502 if (family != AF_UNSPEC && table->family != family)
1505 ctx->family = table->family;
1507 if (!nft_is_active_next(ctx->net, table))
1510 if (nft_table_has_owner(table) && table->nlpid != ctx->portid)
1513 if (nla[NFTA_TABLE_NAME] &&
1514 nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
1519 err = nft_flush_table(ctx);
1527 static int nf_tables_deltable(struct sk_buff *skb, const struct nfnl_info *info,
1528 const struct nlattr * const nla[])
1530 struct netlink_ext_ack *extack = info->extack;
1531 u8 genmask = nft_genmask_next(info->net);
1532 u8 family = info->nfmsg->nfgen_family;
1533 struct net *net = info->net;
1534 const struct nlattr *attr;
1535 struct nft_table *table;
1538 nft_ctx_init(&ctx, net, skb, info->nlh, 0, NULL, NULL, nla);
1539 if (family == AF_UNSPEC ||
1540 (!nla[NFTA_TABLE_NAME] && !nla[NFTA_TABLE_HANDLE]))
1541 return nft_flush(&ctx, family);
1543 if (nla[NFTA_TABLE_HANDLE]) {
1544 attr = nla[NFTA_TABLE_HANDLE];
1545 table = nft_table_lookup_byhandle(net, attr, genmask,
1546 NETLINK_CB(skb).portid);
1548 attr = nla[NFTA_TABLE_NAME];
1549 table = nft_table_lookup(net, attr, family, genmask,
1550 NETLINK_CB(skb).portid);
1553 if (IS_ERR(table)) {
1554 if (PTR_ERR(table) == -ENOENT &&
1555 NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYTABLE)
1558 NL_SET_BAD_ATTR(extack, attr);
1559 return PTR_ERR(table);
1562 if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
1566 ctx.family = family;
1569 return nft_flush_table(&ctx);
1572 static void nf_tables_table_destroy(struct nft_ctx *ctx)
1574 if (WARN_ON(ctx->table->use > 0))
1577 rhltable_destroy(&ctx->table->chains_ht);
1578 kfree(ctx->table->name);
1579 kfree(ctx->table->udata);
1583 void nft_register_chain_type(const struct nft_chain_type *ctype)
1585 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1586 if (WARN_ON(__nft_chain_type_get(ctype->family, ctype->type))) {
1587 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1590 chain_type[ctype->family][ctype->type] = ctype;
1591 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1593 EXPORT_SYMBOL_GPL(nft_register_chain_type);
1595 void nft_unregister_chain_type(const struct nft_chain_type *ctype)
1597 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1598 chain_type[ctype->family][ctype->type] = NULL;
1599 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1601 EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
1607 static struct nft_chain *
1608 nft_chain_lookup_byhandle(const struct nft_table *table, u64 handle, u8 genmask)
1610 struct nft_chain *chain;
1612 list_for_each_entry(chain, &table->chains, list) {
1613 if (chain->handle == handle &&
1614 nft_active_genmask(chain, genmask))
1618 return ERR_PTR(-ENOENT);
1621 static bool lockdep_commit_lock_is_held(const struct net *net)
1623 #ifdef CONFIG_PROVE_LOCKING
1624 struct nftables_pernet *nft_net = nft_pernet(net);
1626 return lockdep_is_held(&nft_net->commit_mutex);
1632 static struct nft_chain *nft_chain_lookup(struct net *net,
1633 struct nft_table *table,
1634 const struct nlattr *nla, u8 genmask)
1636 char search[NFT_CHAIN_MAXNAMELEN + 1];
1637 struct rhlist_head *tmp, *list;
1638 struct nft_chain *chain;
1641 return ERR_PTR(-EINVAL);
1643 nla_strscpy(search, nla, sizeof(search));
1645 WARN_ON(!rcu_read_lock_held() &&
1646 !lockdep_commit_lock_is_held(net));
1648 chain = ERR_PTR(-ENOENT);
1650 list = rhltable_lookup(&table->chains_ht, search, nft_chain_ht_params);
1654 rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
1655 if (nft_active_genmask(chain, genmask))
1658 chain = ERR_PTR(-ENOENT);
1664 static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
1665 [NFTA_CHAIN_TABLE] = { .type = NLA_STRING,
1666 .len = NFT_TABLE_MAXNAMELEN - 1 },
1667 [NFTA_CHAIN_HANDLE] = { .type = NLA_U64 },
1668 [NFTA_CHAIN_NAME] = { .type = NLA_STRING,
1669 .len = NFT_CHAIN_MAXNAMELEN - 1 },
1670 [NFTA_CHAIN_HOOK] = { .type = NLA_NESTED },
1671 [NFTA_CHAIN_POLICY] = { .type = NLA_U32 },
1672 [NFTA_CHAIN_TYPE] = { .type = NLA_STRING,
1673 .len = NFT_MODULE_AUTOLOAD_LIMIT },
1674 [NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED },
1675 [NFTA_CHAIN_FLAGS] = { .type = NLA_U32 },
1676 [NFTA_CHAIN_ID] = { .type = NLA_U32 },
1677 [NFTA_CHAIN_USERDATA] = { .type = NLA_BINARY,
1678 .len = NFT_USERDATA_MAXLEN },
1681 static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
1682 [NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 },
1683 [NFTA_HOOK_PRIORITY] = { .type = NLA_U32 },
1684 [NFTA_HOOK_DEV] = { .type = NLA_STRING,
1685 .len = IFNAMSIZ - 1 },
1688 static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
1690 struct nft_stats *cpu_stats, total;
1691 struct nlattr *nest;
1699 memset(&total, 0, sizeof(total));
1700 for_each_possible_cpu(cpu) {
1701 cpu_stats = per_cpu_ptr(stats, cpu);
1703 seq = u64_stats_fetch_begin(&cpu_stats->syncp);
1704 pkts = cpu_stats->pkts;
1705 bytes = cpu_stats->bytes;
1706 } while (u64_stats_fetch_retry(&cpu_stats->syncp, seq));
1708 total.bytes += bytes;
1710 nest = nla_nest_start_noflag(skb, NFTA_CHAIN_COUNTERS);
1712 goto nla_put_failure;
1714 if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts),
1715 NFTA_COUNTER_PAD) ||
1716 nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
1718 goto nla_put_failure;
1720 nla_nest_end(skb, nest);
1727 static int nft_dump_basechain_hook(struct sk_buff *skb, int family,
1728 const struct nft_base_chain *basechain,
1729 const struct list_head *hook_list)
1731 const struct nf_hook_ops *ops = &basechain->ops;
1732 struct nft_hook *hook, *first = NULL;
1733 struct nlattr *nest, *nest_devs;
1736 nest = nla_nest_start_noflag(skb, NFTA_CHAIN_HOOK);
1738 goto nla_put_failure;
1739 if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
1740 goto nla_put_failure;
1741 if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
1742 goto nla_put_failure;
1744 if (nft_base_chain_netdev(family, ops->hooknum)) {
1745 nest_devs = nla_nest_start_noflag(skb, NFTA_HOOK_DEVS);
1747 goto nla_put_failure;
1750 hook_list = &basechain->hook_list;
1752 list_for_each_entry(hook, hook_list, list) {
1756 if (nla_put_string(skb, NFTA_DEVICE_NAME,
1757 hook->ops.dev->name))
1758 goto nla_put_failure;
1761 nla_nest_end(skb, nest_devs);
1764 nla_put_string(skb, NFTA_HOOK_DEV, first->ops.dev->name))
1765 goto nla_put_failure;
1767 nla_nest_end(skb, nest);
1774 static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
1775 u32 portid, u32 seq, int event, u32 flags,
1776 int family, const struct nft_table *table,
1777 const struct nft_chain *chain,
1778 const struct list_head *hook_list)
1780 struct nlmsghdr *nlh;
1782 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
1783 nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
1784 NFNETLINK_V0, nft_base_seq(net));
1786 goto nla_put_failure;
1788 if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name) ||
1789 nla_put_string(skb, NFTA_CHAIN_NAME, chain->name) ||
1790 nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle),
1792 goto nla_put_failure;
1794 if (event == NFT_MSG_DELCHAIN && !hook_list) {
1795 nlmsg_end(skb, nlh);
1799 if (nft_is_base_chain(chain)) {
1800 const struct nft_base_chain *basechain = nft_base_chain(chain);
1801 struct nft_stats __percpu *stats;
1803 if (nft_dump_basechain_hook(skb, family, basechain, hook_list))
1804 goto nla_put_failure;
1806 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
1807 htonl(basechain->policy)))
1808 goto nla_put_failure;
1810 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
1811 goto nla_put_failure;
1813 stats = rcu_dereference_check(basechain->stats,
1814 lockdep_commit_lock_is_held(net));
1815 if (nft_dump_stats(skb, stats))
1816 goto nla_put_failure;
1820 nla_put_be32(skb, NFTA_CHAIN_FLAGS, htonl(chain->flags)))
1821 goto nla_put_failure;
1823 if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
1824 goto nla_put_failure;
1827 nla_put(skb, NFTA_CHAIN_USERDATA, chain->udlen, chain->udata))
1828 goto nla_put_failure;
1830 nlmsg_end(skb, nlh);
1834 nlmsg_trim(skb, nlh);
1838 static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event,
1839 const struct list_head *hook_list)
1841 struct nftables_pernet *nft_net;
1842 struct sk_buff *skb;
1847 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1850 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1854 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
1855 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
1857 err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
1858 event, flags, ctx->family, ctx->table,
1859 ctx->chain, hook_list);
1865 nft_net = nft_pernet(ctx->net);
1866 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
1869 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
1872 static int nf_tables_dump_chains(struct sk_buff *skb,
1873 struct netlink_callback *cb)
1875 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1876 unsigned int idx = 0, s_idx = cb->args[0];
1877 struct net *net = sock_net(skb->sk);
1878 int family = nfmsg->nfgen_family;
1879 struct nftables_pernet *nft_net;
1880 const struct nft_table *table;
1881 const struct nft_chain *chain;
1884 nft_net = nft_pernet(net);
1885 cb->seq = READ_ONCE(nft_net->base_seq);
1887 list_for_each_entry_rcu(table, &nft_net->tables, list) {
1888 if (family != NFPROTO_UNSPEC && family != table->family)
1891 list_for_each_entry_rcu(chain, &table->chains, list) {
1895 memset(&cb->args[1], 0,
1896 sizeof(cb->args) - sizeof(cb->args[0]));
1897 if (!nft_is_active(net, chain))
1899 if (nf_tables_fill_chain_info(skb, net,
1900 NETLINK_CB(cb->skb).portid,
1904 table->family, table,
1908 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1919 /* called with rcu_read_lock held */
1920 static int nf_tables_getchain(struct sk_buff *skb, const struct nfnl_info *info,
1921 const struct nlattr * const nla[])
1923 struct netlink_ext_ack *extack = info->extack;
1924 u8 genmask = nft_genmask_cur(info->net);
1925 u8 family = info->nfmsg->nfgen_family;
1926 const struct nft_chain *chain;
1927 struct net *net = info->net;
1928 struct nft_table *table;
1929 struct sk_buff *skb2;
1932 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
1933 struct netlink_dump_control c = {
1934 .dump = nf_tables_dump_chains,
1935 .module = THIS_MODULE,
1938 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
1941 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask, 0);
1942 if (IS_ERR(table)) {
1943 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
1944 return PTR_ERR(table);
1947 chain = nft_chain_lookup(net, table, nla[NFTA_CHAIN_NAME], genmask);
1948 if (IS_ERR(chain)) {
1949 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
1950 return PTR_ERR(chain);
1953 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1957 err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
1958 info->nlh->nlmsg_seq, NFT_MSG_NEWCHAIN,
1959 0, family, table, chain, NULL);
1961 goto err_fill_chain_info;
1963 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
1965 err_fill_chain_info:
1970 static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
1971 [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 },
1972 [NFTA_COUNTER_BYTES] = { .type = NLA_U64 },
1975 static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
1977 struct nlattr *tb[NFTA_COUNTER_MAX+1];
1978 struct nft_stats __percpu *newstats;
1979 struct nft_stats *stats;
1982 err = nla_parse_nested_deprecated(tb, NFTA_COUNTER_MAX, attr,
1983 nft_counter_policy, NULL);
1985 return ERR_PTR(err);
1987 if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
1988 return ERR_PTR(-EINVAL);
1990 newstats = netdev_alloc_pcpu_stats(struct nft_stats);
1991 if (newstats == NULL)
1992 return ERR_PTR(-ENOMEM);
1994 /* Restore old counters on this cpu, no problem. Per-cpu statistics
1995 * are not exposed to userspace.
1998 stats = this_cpu_ptr(newstats);
1999 stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
2000 stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
2006 static void nft_chain_stats_replace(struct nft_trans *trans)
2008 struct nft_base_chain *chain = nft_base_chain(trans->ctx.chain);
2010 if (!nft_trans_chain_stats(trans))
2013 nft_trans_chain_stats(trans) =
2014 rcu_replace_pointer(chain->stats, nft_trans_chain_stats(trans),
2015 lockdep_commit_lock_is_held(trans->ctx.net));
2017 if (!nft_trans_chain_stats(trans))
2018 static_branch_inc(&nft_counters_enabled);
2021 static void nf_tables_chain_free_chain_rules(struct nft_chain *chain)
2023 struct nft_rule_blob *g0 = rcu_dereference_raw(chain->blob_gen_0);
2024 struct nft_rule_blob *g1 = rcu_dereference_raw(chain->blob_gen_1);
2030 /* should be NULL either via abort or via successful commit */
2031 WARN_ON_ONCE(chain->blob_next);
2032 kvfree(chain->blob_next);
2035 void nf_tables_chain_destroy(struct nft_ctx *ctx)
2037 struct nft_chain *chain = ctx->chain;
2038 struct nft_hook *hook, *next;
2040 if (WARN_ON(chain->use > 0))
2043 /* no concurrent access possible anymore */
2044 nf_tables_chain_free_chain_rules(chain);
2046 if (nft_is_base_chain(chain)) {
2047 struct nft_base_chain *basechain = nft_base_chain(chain);
2049 if (nft_base_chain_netdev(ctx->family, basechain->ops.hooknum)) {
2050 list_for_each_entry_safe(hook, next,
2051 &basechain->hook_list, list) {
2052 list_del_rcu(&hook->list);
2053 kfree_rcu(hook, rcu);
2056 module_put(basechain->type->owner);
2057 if (rcu_access_pointer(basechain->stats)) {
2058 static_branch_dec(&nft_counters_enabled);
2059 free_percpu(rcu_dereference_raw(basechain->stats));
2062 kfree(chain->udata);
2066 kfree(chain->udata);
2071 static struct nft_hook *nft_netdev_hook_alloc(struct net *net,
2072 const struct nlattr *attr)
2074 struct net_device *dev;
2075 char ifname[IFNAMSIZ];
2076 struct nft_hook *hook;
2079 hook = kmalloc(sizeof(struct nft_hook), GFP_KERNEL_ACCOUNT);
2082 goto err_hook_alloc;
2085 nla_strscpy(ifname, attr, IFNAMSIZ);
2086 /* nf_tables_netdev_event() is called under rtnl_mutex, this is
2087 * indirectly serializing all the other holders of the commit_mutex with
2090 dev = __dev_get_by_name(net, ifname);
2095 hook->ops.dev = dev;
2102 return ERR_PTR(err);
2105 static struct nft_hook *nft_hook_list_find(struct list_head *hook_list,
2106 const struct nft_hook *this)
2108 struct nft_hook *hook;
2110 list_for_each_entry(hook, hook_list, list) {
2111 if (this->ops.dev == hook->ops.dev)
2118 static int nf_tables_parse_netdev_hooks(struct net *net,
2119 const struct nlattr *attr,
2120 struct list_head *hook_list,
2121 struct netlink_ext_ack *extack)
2123 struct nft_hook *hook, *next;
2124 const struct nlattr *tmp;
2125 int rem, n = 0, err;
2127 nla_for_each_nested(tmp, attr, rem) {
2128 if (nla_type(tmp) != NFTA_DEVICE_NAME) {
2133 hook = nft_netdev_hook_alloc(net, tmp);
2135 NL_SET_BAD_ATTR(extack, tmp);
2136 err = PTR_ERR(hook);
2139 if (nft_hook_list_find(hook_list, hook)) {
2140 NL_SET_BAD_ATTR(extack, tmp);
2145 list_add_tail(&hook->list, hook_list);
2148 if (n == NFT_NETDEVICE_MAX) {
2157 list_for_each_entry_safe(hook, next, hook_list, list) {
2158 list_del(&hook->list);
2164 struct nft_chain_hook {
2167 const struct nft_chain_type *type;
2168 struct list_head list;
2171 static int nft_chain_parse_netdev(struct net *net, struct nlattr *tb[],
2172 struct list_head *hook_list,
2173 struct netlink_ext_ack *extack, u32 flags)
2175 struct nft_hook *hook;
2178 if (tb[NFTA_HOOK_DEV]) {
2179 hook = nft_netdev_hook_alloc(net, tb[NFTA_HOOK_DEV]);
2181 NL_SET_BAD_ATTR(extack, tb[NFTA_HOOK_DEV]);
2182 return PTR_ERR(hook);
2185 list_add_tail(&hook->list, hook_list);
2186 } else if (tb[NFTA_HOOK_DEVS]) {
2187 err = nf_tables_parse_netdev_hooks(net, tb[NFTA_HOOK_DEVS],
2194 if (flags & NFT_CHAIN_HW_OFFLOAD &&
2195 list_empty(hook_list))
2201 static int nft_chain_parse_hook(struct net *net,
2202 struct nft_base_chain *basechain,
2203 const struct nlattr * const nla[],
2204 struct nft_chain_hook *hook, u8 family,
2205 u32 flags, struct netlink_ext_ack *extack)
2207 struct nftables_pernet *nft_net = nft_pernet(net);
2208 struct nlattr *ha[NFTA_HOOK_MAX + 1];
2209 const struct nft_chain_type *type;
2212 lockdep_assert_held(&nft_net->commit_mutex);
2213 lockdep_nfnl_nft_mutex_not_held();
2215 err = nla_parse_nested_deprecated(ha, NFTA_HOOK_MAX,
2216 nla[NFTA_CHAIN_HOOK],
2217 nft_hook_policy, NULL);
2222 if (!ha[NFTA_HOOK_HOOKNUM] ||
2223 !ha[NFTA_HOOK_PRIORITY]) {
2224 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2228 hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
2229 hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
2231 type = __nft_chain_type_get(family, NFT_CHAIN_T_DEFAULT);
2235 if (nla[NFTA_CHAIN_TYPE]) {
2236 type = nf_tables_chain_type_lookup(net, nla[NFTA_CHAIN_TYPE],
2239 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
2240 return PTR_ERR(type);
2243 if (hook->num >= NFT_MAX_HOOKS || !(type->hook_mask & (1 << hook->num)))
2246 if (type->type == NFT_CHAIN_T_NAT &&
2247 hook->priority <= NF_IP_PRI_CONNTRACK)
2250 if (ha[NFTA_HOOK_HOOKNUM]) {
2251 hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
2252 if (hook->num != basechain->ops.hooknum)
2255 if (ha[NFTA_HOOK_PRIORITY]) {
2256 hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
2257 if (hook->priority != basechain->ops.priority)
2261 type = basechain->type;
2264 if (!try_module_get(type->owner)) {
2265 if (nla[NFTA_CHAIN_TYPE])
2266 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
2272 INIT_LIST_HEAD(&hook->list);
2273 if (nft_base_chain_netdev(family, hook->num)) {
2274 err = nft_chain_parse_netdev(net, ha, &hook->list, extack, flags);
2276 module_put(type->owner);
2279 } else if (ha[NFTA_HOOK_DEV] || ha[NFTA_HOOK_DEVS]) {
2280 module_put(type->owner);
2287 static void nft_chain_release_hook(struct nft_chain_hook *hook)
2289 struct nft_hook *h, *next;
2291 list_for_each_entry_safe(h, next, &hook->list, list) {
2295 module_put(hook->type->owner);
2298 static void nft_last_rule(const struct nft_chain *chain, const void *ptr)
2300 struct nft_rule_dp_last *lrule;
2302 BUILD_BUG_ON(offsetof(struct nft_rule_dp_last, end) != 0);
2304 lrule = (struct nft_rule_dp_last *)ptr;
2305 lrule->end.is_last = 1;
2306 lrule->chain = chain;
2307 /* blob size does not include the trailer rule */
2310 static struct nft_rule_blob *nf_tables_chain_alloc_rules(const struct nft_chain *chain,
2313 struct nft_rule_blob *blob;
2318 size += sizeof(struct nft_rule_blob) + sizeof(struct nft_rule_dp_last);
2320 blob = kvmalloc(size, GFP_KERNEL_ACCOUNT);
2325 nft_last_rule(chain, blob->data);
2330 static void nft_basechain_hook_init(struct nf_hook_ops *ops, u8 family,
2331 const struct nft_chain_hook *hook,
2332 struct nft_chain *chain)
2335 ops->hooknum = hook->num;
2336 ops->priority = hook->priority;
2338 ops->hook = hook->type->hooks[ops->hooknum];
2339 ops->hook_ops_type = NF_HOOK_OP_NF_TABLES;
2342 static int nft_basechain_init(struct nft_base_chain *basechain, u8 family,
2343 struct nft_chain_hook *hook, u32 flags)
2345 struct nft_chain *chain;
2348 basechain->type = hook->type;
2349 INIT_LIST_HEAD(&basechain->hook_list);
2350 chain = &basechain->chain;
2352 if (nft_base_chain_netdev(family, hook->num)) {
2353 list_splice_init(&hook->list, &basechain->hook_list);
2354 list_for_each_entry(h, &basechain->hook_list, list)
2355 nft_basechain_hook_init(&h->ops, family, hook, chain);
2357 nft_basechain_hook_init(&basechain->ops, family, hook, chain);
2359 chain->flags |= NFT_CHAIN_BASE | flags;
2360 basechain->policy = NF_ACCEPT;
2361 if (chain->flags & NFT_CHAIN_HW_OFFLOAD &&
2362 !nft_chain_offload_support(basechain)) {
2363 list_splice_init(&basechain->hook_list, &hook->list);
2367 flow_block_init(&basechain->flow_block);
2372 int nft_chain_add(struct nft_table *table, struct nft_chain *chain)
2376 err = rhltable_insert_key(&table->chains_ht, chain->name,
2377 &chain->rhlhead, nft_chain_ht_params);
2381 list_add_tail_rcu(&chain->list, &table->chains);
2386 static u64 chain_id;
2388 static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask,
2389 u8 policy, u32 flags,
2390 struct netlink_ext_ack *extack)
2392 const struct nlattr * const *nla = ctx->nla;
2393 struct nft_table *table = ctx->table;
2394 struct nft_base_chain *basechain;
2395 struct net *net = ctx->net;
2396 char name[NFT_NAME_MAXLEN];
2397 struct nft_rule_blob *blob;
2398 struct nft_trans *trans;
2399 struct nft_chain *chain;
2402 if (nla[NFTA_CHAIN_HOOK]) {
2403 struct nft_stats __percpu *stats = NULL;
2404 struct nft_chain_hook hook = {};
2406 if (flags & NFT_CHAIN_BINDING)
2409 err = nft_chain_parse_hook(net, NULL, nla, &hook, family, flags,
2414 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL_ACCOUNT);
2415 if (basechain == NULL) {
2416 nft_chain_release_hook(&hook);
2419 chain = &basechain->chain;
2421 if (nla[NFTA_CHAIN_COUNTERS]) {
2422 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2423 if (IS_ERR(stats)) {
2424 nft_chain_release_hook(&hook);
2426 return PTR_ERR(stats);
2428 rcu_assign_pointer(basechain->stats, stats);
2431 err = nft_basechain_init(basechain, family, &hook, flags);
2433 nft_chain_release_hook(&hook);
2439 static_branch_inc(&nft_counters_enabled);
2441 if (flags & NFT_CHAIN_BASE)
2443 if (flags & NFT_CHAIN_HW_OFFLOAD)
2446 chain = kzalloc(sizeof(*chain), GFP_KERNEL_ACCOUNT);
2450 chain->flags = flags;
2454 INIT_LIST_HEAD(&chain->rules);
2455 chain->handle = nf_tables_alloc_handle(table);
2456 chain->table = table;
2458 if (nla[NFTA_CHAIN_NAME]) {
2459 chain->name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL_ACCOUNT);
2461 if (!(flags & NFT_CHAIN_BINDING)) {
2463 goto err_destroy_chain;
2466 snprintf(name, sizeof(name), "__chain%llu", ++chain_id);
2467 chain->name = kstrdup(name, GFP_KERNEL_ACCOUNT);
2472 goto err_destroy_chain;
2475 if (nla[NFTA_CHAIN_USERDATA]) {
2476 chain->udata = nla_memdup(nla[NFTA_CHAIN_USERDATA], GFP_KERNEL_ACCOUNT);
2477 if (chain->udata == NULL) {
2479 goto err_destroy_chain;
2481 chain->udlen = nla_len(nla[NFTA_CHAIN_USERDATA]);
2484 blob = nf_tables_chain_alloc_rules(chain, 0);
2487 goto err_destroy_chain;
2490 RCU_INIT_POINTER(chain->blob_gen_0, blob);
2491 RCU_INIT_POINTER(chain->blob_gen_1, blob);
2493 err = nf_tables_register_hook(net, table, chain);
2495 goto err_destroy_chain;
2497 if (!nft_use_inc(&table->use)) {
2502 trans = nft_trans_chain_add(ctx, NFT_MSG_NEWCHAIN);
2503 if (IS_ERR(trans)) {
2504 err = PTR_ERR(trans);
2505 goto err_unregister_hook;
2508 nft_trans_chain_policy(trans) = NFT_CHAIN_POLICY_UNSET;
2509 if (nft_is_base_chain(chain))
2510 nft_trans_chain_policy(trans) = policy;
2512 err = nft_chain_add(table, chain);
2514 nft_trans_destroy(trans);
2515 goto err_unregister_hook;
2520 err_unregister_hook:
2521 nft_use_dec_restore(&table->use);
2523 nf_tables_unregister_hook(net, table, chain);
2525 nf_tables_chain_destroy(ctx);
2530 static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
2531 u32 flags, const struct nlattr *attr,
2532 struct netlink_ext_ack *extack)
2534 const struct nlattr * const *nla = ctx->nla;
2535 struct nft_base_chain *basechain = NULL;
2536 struct nft_table *table = ctx->table;
2537 struct nft_chain *chain = ctx->chain;
2538 struct nft_chain_hook hook = {};
2539 struct nft_stats *stats = NULL;
2540 struct nft_hook *h, *next;
2541 struct nf_hook_ops *ops;
2542 struct nft_trans *trans;
2543 bool unregister = false;
2546 if (chain->flags ^ flags)
2549 INIT_LIST_HEAD(&hook.list);
2551 if (nla[NFTA_CHAIN_HOOK]) {
2552 if (!nft_is_base_chain(chain)) {
2553 NL_SET_BAD_ATTR(extack, attr);
2557 basechain = nft_base_chain(chain);
2558 err = nft_chain_parse_hook(ctx->net, basechain, nla, &hook,
2559 ctx->family, flags, extack);
2563 if (basechain->type != hook.type) {
2564 nft_chain_release_hook(&hook);
2565 NL_SET_BAD_ATTR(extack, attr);
2569 if (nft_base_chain_netdev(ctx->family, basechain->ops.hooknum)) {
2570 list_for_each_entry_safe(h, next, &hook.list, list) {
2571 h->ops.pf = basechain->ops.pf;
2572 h->ops.hooknum = basechain->ops.hooknum;
2573 h->ops.priority = basechain->ops.priority;
2574 h->ops.priv = basechain->ops.priv;
2575 h->ops.hook = basechain->ops.hook;
2577 if (nft_hook_list_find(&basechain->hook_list, h)) {
2583 ops = &basechain->ops;
2584 if (ops->hooknum != hook.num ||
2585 ops->priority != hook.priority) {
2586 nft_chain_release_hook(&hook);
2587 NL_SET_BAD_ATTR(extack, attr);
2593 if (nla[NFTA_CHAIN_HANDLE] &&
2594 nla[NFTA_CHAIN_NAME]) {
2595 struct nft_chain *chain2;
2597 chain2 = nft_chain_lookup(ctx->net, table,
2598 nla[NFTA_CHAIN_NAME], genmask);
2599 if (!IS_ERR(chain2)) {
2600 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2606 if (nla[NFTA_CHAIN_COUNTERS]) {
2607 if (!nft_is_base_chain(chain)) {
2612 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2613 if (IS_ERR(stats)) {
2614 err = PTR_ERR(stats);
2619 if (!(table->flags & NFT_TABLE_F_DORMANT) &&
2620 nft_is_base_chain(chain) &&
2621 !list_empty(&hook.list)) {
2622 basechain = nft_base_chain(chain);
2623 ops = &basechain->ops;
2625 if (nft_base_chain_netdev(table->family, basechain->ops.hooknum)) {
2626 err = nft_netdev_register_hooks(ctx->net, &hook.list);
2634 trans = nft_trans_alloc(ctx, NFT_MSG_NEWCHAIN,
2635 sizeof(struct nft_trans_chain));
2639 nft_trans_chain_stats(trans) = stats;
2640 nft_trans_chain_update(trans) = true;
2642 if (nla[NFTA_CHAIN_POLICY])
2643 nft_trans_chain_policy(trans) = policy;
2645 nft_trans_chain_policy(trans) = -1;
2647 if (nla[NFTA_CHAIN_HANDLE] &&
2648 nla[NFTA_CHAIN_NAME]) {
2649 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
2650 struct nft_trans *tmp;
2654 name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL_ACCOUNT);
2659 list_for_each_entry(tmp, &nft_net->commit_list, list) {
2660 if (tmp->msg_type == NFT_MSG_NEWCHAIN &&
2661 tmp->ctx.table == table &&
2662 nft_trans_chain_update(tmp) &&
2663 nft_trans_chain_name(tmp) &&
2664 strcmp(name, nft_trans_chain_name(tmp)) == 0) {
2665 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2671 nft_trans_chain_name(trans) = name;
2674 nft_trans_basechain(trans) = basechain;
2675 INIT_LIST_HEAD(&nft_trans_chain_hooks(trans));
2676 list_splice(&hook.list, &nft_trans_chain_hooks(trans));
2677 if (nla[NFTA_CHAIN_HOOK])
2678 module_put(hook.type->owner);
2680 nft_trans_commit_list_add_tail(ctx->net, trans);
2688 if (nla[NFTA_CHAIN_HOOK]) {
2689 list_for_each_entry_safe(h, next, &hook.list, list) {
2691 nf_unregister_net_hook(ctx->net, &h->ops);
2695 module_put(hook.type->owner);
2701 static struct nft_chain *nft_chain_lookup_byid(const struct net *net,
2702 const struct nft_table *table,
2703 const struct nlattr *nla, u8 genmask)
2705 struct nftables_pernet *nft_net = nft_pernet(net);
2706 u32 id = ntohl(nla_get_be32(nla));
2707 struct nft_trans *trans;
2709 list_for_each_entry(trans, &nft_net->commit_list, list) {
2710 struct nft_chain *chain = trans->ctx.chain;
2712 if (trans->msg_type == NFT_MSG_NEWCHAIN &&
2713 chain->table == table &&
2714 id == nft_trans_chain_id(trans) &&
2715 nft_active_genmask(chain, genmask))
2718 return ERR_PTR(-ENOENT);
2721 static int nf_tables_newchain(struct sk_buff *skb, const struct nfnl_info *info,
2722 const struct nlattr * const nla[])
2724 struct nftables_pernet *nft_net = nft_pernet(info->net);
2725 struct netlink_ext_ack *extack = info->extack;
2726 u8 genmask = nft_genmask_next(info->net);
2727 u8 family = info->nfmsg->nfgen_family;
2728 struct nft_chain *chain = NULL;
2729 struct net *net = info->net;
2730 const struct nlattr *attr;
2731 struct nft_table *table;
2732 u8 policy = NF_ACCEPT;
2737 lockdep_assert_held(&nft_net->commit_mutex);
2739 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2740 NETLINK_CB(skb).portid);
2741 if (IS_ERR(table)) {
2742 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2743 return PTR_ERR(table);
2747 attr = nla[NFTA_CHAIN_NAME];
2749 if (nla[NFTA_CHAIN_HANDLE]) {
2750 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
2751 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2752 if (IS_ERR(chain)) {
2753 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_HANDLE]);
2754 return PTR_ERR(chain);
2756 attr = nla[NFTA_CHAIN_HANDLE];
2757 } else if (nla[NFTA_CHAIN_NAME]) {
2758 chain = nft_chain_lookup(net, table, attr, genmask);
2759 if (IS_ERR(chain)) {
2760 if (PTR_ERR(chain) != -ENOENT) {
2761 NL_SET_BAD_ATTR(extack, attr);
2762 return PTR_ERR(chain);
2766 } else if (!nla[NFTA_CHAIN_ID]) {
2770 if (nla[NFTA_CHAIN_POLICY]) {
2771 if (chain != NULL &&
2772 !nft_is_base_chain(chain)) {
2773 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2777 if (chain == NULL &&
2778 nla[NFTA_CHAIN_HOOK] == NULL) {
2779 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2783 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
2793 if (nla[NFTA_CHAIN_FLAGS])
2794 flags = ntohl(nla_get_be32(nla[NFTA_CHAIN_FLAGS]));
2796 flags = chain->flags;
2798 if (flags & ~NFT_CHAIN_FLAGS)
2801 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
2803 if (chain != NULL) {
2804 if (chain->flags & NFT_CHAIN_BINDING)
2807 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
2808 NL_SET_BAD_ATTR(extack, attr);
2811 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
2814 flags |= chain->flags & NFT_CHAIN_BASE;
2815 return nf_tables_updchain(&ctx, genmask, policy, flags, attr,
2819 return nf_tables_addchain(&ctx, family, genmask, policy, flags, extack);
2822 static int nft_delchain_hook(struct nft_ctx *ctx,
2823 struct nft_base_chain *basechain,
2824 struct netlink_ext_ack *extack)
2826 const struct nft_chain *chain = &basechain->chain;
2827 const struct nlattr * const *nla = ctx->nla;
2828 struct nft_chain_hook chain_hook = {};
2829 struct nft_hook *this, *hook;
2830 LIST_HEAD(chain_del_list);
2831 struct nft_trans *trans;
2834 err = nft_chain_parse_hook(ctx->net, basechain, nla, &chain_hook,
2835 ctx->family, chain->flags, extack);
2839 list_for_each_entry(this, &chain_hook.list, list) {
2840 hook = nft_hook_list_find(&basechain->hook_list, this);
2843 goto err_chain_del_hook;
2845 list_move(&hook->list, &chain_del_list);
2848 trans = nft_trans_alloc(ctx, NFT_MSG_DELCHAIN,
2849 sizeof(struct nft_trans_chain));
2852 goto err_chain_del_hook;
2855 nft_trans_basechain(trans) = basechain;
2856 nft_trans_chain_update(trans) = true;
2857 INIT_LIST_HEAD(&nft_trans_chain_hooks(trans));
2858 list_splice(&chain_del_list, &nft_trans_chain_hooks(trans));
2859 nft_chain_release_hook(&chain_hook);
2861 nft_trans_commit_list_add_tail(ctx->net, trans);
2866 list_splice(&chain_del_list, &basechain->hook_list);
2867 nft_chain_release_hook(&chain_hook);
2872 static int nf_tables_delchain(struct sk_buff *skb, const struct nfnl_info *info,
2873 const struct nlattr * const nla[])
2875 struct netlink_ext_ack *extack = info->extack;
2876 u8 genmask = nft_genmask_next(info->net);
2877 u8 family = info->nfmsg->nfgen_family;
2878 struct net *net = info->net;
2879 const struct nlattr *attr;
2880 struct nft_table *table;
2881 struct nft_chain *chain;
2882 struct nft_rule *rule;
2888 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2889 NETLINK_CB(skb).portid);
2890 if (IS_ERR(table)) {
2891 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2892 return PTR_ERR(table);
2895 if (nla[NFTA_CHAIN_HANDLE]) {
2896 attr = nla[NFTA_CHAIN_HANDLE];
2897 handle = be64_to_cpu(nla_get_be64(attr));
2898 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2900 attr = nla[NFTA_CHAIN_NAME];
2901 chain = nft_chain_lookup(net, table, attr, genmask);
2903 if (IS_ERR(chain)) {
2904 if (PTR_ERR(chain) == -ENOENT &&
2905 NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYCHAIN)
2908 NL_SET_BAD_ATTR(extack, attr);
2909 return PTR_ERR(chain);
2912 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
2914 if (nla[NFTA_CHAIN_HOOK]) {
2915 if (chain->flags & NFT_CHAIN_HW_OFFLOAD)
2918 if (nft_is_base_chain(chain)) {
2919 struct nft_base_chain *basechain = nft_base_chain(chain);
2921 if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
2922 return nft_delchain_hook(&ctx, basechain, extack);
2926 if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
2931 list_for_each_entry(rule, &chain->rules, list) {
2932 if (!nft_is_active_next(net, rule))
2936 err = nft_delrule(&ctx, rule);
2941 /* There are rules and elements that are still holding references to us,
2942 * we cannot do a recursive removal in this case.
2945 NL_SET_BAD_ATTR(extack, attr);
2949 return nft_delchain(&ctx);
2957 * nft_register_expr - register nf_tables expr type
2960 * Registers the expr type for use with nf_tables. Returns zero on
2961 * success or a negative errno code otherwise.
2963 int nft_register_expr(struct nft_expr_type *type)
2965 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2966 if (type->family == NFPROTO_UNSPEC)
2967 list_add_tail_rcu(&type->list, &nf_tables_expressions);
2969 list_add_rcu(&type->list, &nf_tables_expressions);
2970 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2973 EXPORT_SYMBOL_GPL(nft_register_expr);
2976 * nft_unregister_expr - unregister nf_tables expr type
2979 * Unregisters the expr typefor use with nf_tables.
2981 void nft_unregister_expr(struct nft_expr_type *type)
2983 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2984 list_del_rcu(&type->list);
2985 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2987 EXPORT_SYMBOL_GPL(nft_unregister_expr);
2989 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
2992 const struct nft_expr_type *type, *candidate = NULL;
2994 list_for_each_entry(type, &nf_tables_expressions, list) {
2995 if (!nla_strcmp(nla, type->name)) {
2996 if (!type->family && !candidate)
2998 else if (type->family == family)
3005 #ifdef CONFIG_MODULES
3006 static int nft_expr_type_request_module(struct net *net, u8 family,
3009 if (nft_request_module(net, "nft-expr-%u-%.*s", family,
3010 nla_len(nla), (char *)nla_data(nla)) == -EAGAIN)
3017 static const struct nft_expr_type *nft_expr_type_get(struct net *net,
3021 const struct nft_expr_type *type;
3024 return ERR_PTR(-EINVAL);
3026 type = __nft_expr_type_get(family, nla);
3027 if (type != NULL && try_module_get(type->owner))
3030 lockdep_nfnl_nft_mutex_not_held();
3031 #ifdef CONFIG_MODULES
3033 if (nft_expr_type_request_module(net, family, nla) == -EAGAIN)
3034 return ERR_PTR(-EAGAIN);
3036 if (nft_request_module(net, "nft-expr-%.*s",
3038 (char *)nla_data(nla)) == -EAGAIN)
3039 return ERR_PTR(-EAGAIN);
3042 return ERR_PTR(-ENOENT);
3045 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
3046 [NFTA_EXPR_NAME] = { .type = NLA_STRING,
3047 .len = NFT_MODULE_AUTOLOAD_LIMIT },
3048 [NFTA_EXPR_DATA] = { .type = NLA_NESTED },
3051 static int nf_tables_fill_expr_info(struct sk_buff *skb,
3052 const struct nft_expr *expr, bool reset)
3054 if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
3055 goto nla_put_failure;
3057 if (expr->ops->dump) {
3058 struct nlattr *data = nla_nest_start_noflag(skb,
3061 goto nla_put_failure;
3062 if (expr->ops->dump(skb, expr, reset) < 0)
3063 goto nla_put_failure;
3064 nla_nest_end(skb, data);
3073 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
3074 const struct nft_expr *expr, bool reset)
3076 struct nlattr *nest;
3078 nest = nla_nest_start_noflag(skb, attr);
3080 goto nla_put_failure;
3081 if (nf_tables_fill_expr_info(skb, expr, reset) < 0)
3082 goto nla_put_failure;
3083 nla_nest_end(skb, nest);
3090 struct nft_expr_info {
3091 const struct nft_expr_ops *ops;
3092 const struct nlattr *attr;
3093 struct nlattr *tb[NFT_EXPR_MAXATTR + 1];
3096 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
3097 const struct nlattr *nla,
3098 struct nft_expr_info *info)
3100 const struct nft_expr_type *type;
3101 const struct nft_expr_ops *ops;
3102 struct nlattr *tb[NFTA_EXPR_MAX + 1];
3105 err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
3106 nft_expr_policy, NULL);
3110 type = nft_expr_type_get(ctx->net, ctx->family, tb[NFTA_EXPR_NAME]);
3112 return PTR_ERR(type);
3114 if (tb[NFTA_EXPR_DATA]) {
3115 err = nla_parse_nested_deprecated(info->tb, type->maxattr,
3117 type->policy, NULL);
3121 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
3123 if (type->select_ops != NULL) {
3124 ops = type->select_ops(ctx,
3125 (const struct nlattr * const *)info->tb);
3128 #ifdef CONFIG_MODULES
3130 if (nft_expr_type_request_module(ctx->net,
3132 tb[NFTA_EXPR_NAME]) != -EAGAIN)
3146 module_put(type->owner);
3150 int nft_expr_inner_parse(const struct nft_ctx *ctx, const struct nlattr *nla,
3151 struct nft_expr_info *info)
3153 struct nlattr *tb[NFTA_EXPR_MAX + 1];
3154 const struct nft_expr_type *type;
3157 err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
3158 nft_expr_policy, NULL);
3162 if (!tb[NFTA_EXPR_DATA])
3165 type = __nft_expr_type_get(ctx->family, tb[NFTA_EXPR_NAME]);
3169 if (!type->inner_ops)
3172 err = nla_parse_nested_deprecated(info->tb, type->maxattr,
3174 type->policy, NULL);
3179 info->ops = type->inner_ops;
3187 static int nf_tables_newexpr(const struct nft_ctx *ctx,
3188 const struct nft_expr_info *expr_info,
3189 struct nft_expr *expr)
3191 const struct nft_expr_ops *ops = expr_info->ops;
3196 err = ops->init(ctx, expr, (const struct nlattr **)expr_info->tb);
3207 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
3208 struct nft_expr *expr)
3210 const struct nft_expr_type *type = expr->ops->type;
3212 if (expr->ops->destroy)
3213 expr->ops->destroy(ctx, expr);
3214 module_put(type->owner);
3217 static struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
3218 const struct nlattr *nla)
3220 struct nft_expr_info expr_info;
3221 struct nft_expr *expr;
3222 struct module *owner;
3225 err = nf_tables_expr_parse(ctx, nla, &expr_info);
3227 goto err_expr_parse;
3230 if (!(expr_info.ops->type->flags & NFT_EXPR_STATEFUL))
3231 goto err_expr_stateful;
3234 expr = kzalloc(expr_info.ops->size, GFP_KERNEL_ACCOUNT);
3236 goto err_expr_stateful;
3238 err = nf_tables_newexpr(ctx, &expr_info, expr);
3246 owner = expr_info.ops->type->owner;
3247 if (expr_info.ops->type->release_ops)
3248 expr_info.ops->type->release_ops(expr_info.ops);
3252 return ERR_PTR(err);
3255 int nft_expr_clone(struct nft_expr *dst, struct nft_expr *src)
3259 if (src->ops->clone) {
3260 dst->ops = src->ops;
3261 err = src->ops->clone(dst, src);
3265 memcpy(dst, src, src->ops->size);
3268 __module_get(src->ops->type->owner);
3273 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
3275 nf_tables_expr_destroy(ctx, expr);
3283 static struct nft_rule *__nft_rule_lookup(const struct nft_chain *chain,
3286 struct nft_rule *rule;
3288 // FIXME: this sucks
3289 list_for_each_entry_rcu(rule, &chain->rules, list) {
3290 if (handle == rule->handle)
3294 return ERR_PTR(-ENOENT);
3297 static struct nft_rule *nft_rule_lookup(const struct nft_chain *chain,
3298 const struct nlattr *nla)
3301 return ERR_PTR(-EINVAL);
3303 return __nft_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
3306 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
3307 [NFTA_RULE_TABLE] = { .type = NLA_STRING,
3308 .len = NFT_TABLE_MAXNAMELEN - 1 },
3309 [NFTA_RULE_CHAIN] = { .type = NLA_STRING,
3310 .len = NFT_CHAIN_MAXNAMELEN - 1 },
3311 [NFTA_RULE_HANDLE] = { .type = NLA_U64 },
3312 [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
3313 [NFTA_RULE_COMPAT] = { .type = NLA_NESTED },
3314 [NFTA_RULE_POSITION] = { .type = NLA_U64 },
3315 [NFTA_RULE_USERDATA] = { .type = NLA_BINARY,
3316 .len = NFT_USERDATA_MAXLEN },
3317 [NFTA_RULE_ID] = { .type = NLA_U32 },
3318 [NFTA_RULE_POSITION_ID] = { .type = NLA_U32 },
3319 [NFTA_RULE_CHAIN_ID] = { .type = NLA_U32 },
3322 static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
3323 u32 portid, u32 seq, int event,
3324 u32 flags, int family,
3325 const struct nft_table *table,
3326 const struct nft_chain *chain,
3327 const struct nft_rule *rule, u64 handle,
3330 struct nlmsghdr *nlh;
3331 const struct nft_expr *expr, *next;
3332 struct nlattr *list;
3333 u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
3335 nlh = nfnl_msg_put(skb, portid, seq, type, flags, family, NFNETLINK_V0,
3338 goto nla_put_failure;
3340 if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
3341 goto nla_put_failure;
3342 if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
3343 goto nla_put_failure;
3344 if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
3346 goto nla_put_failure;
3348 if (event != NFT_MSG_DELRULE && handle) {
3349 if (nla_put_be64(skb, NFTA_RULE_POSITION, cpu_to_be64(handle),
3351 goto nla_put_failure;
3354 if (chain->flags & NFT_CHAIN_HW_OFFLOAD)
3355 nft_flow_rule_stats(chain, rule);
3357 list = nla_nest_start_noflag(skb, NFTA_RULE_EXPRESSIONS);
3359 goto nla_put_failure;
3360 nft_rule_for_each_expr(expr, next, rule) {
3361 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr, reset) < 0)
3362 goto nla_put_failure;
3364 nla_nest_end(skb, list);
3367 struct nft_userdata *udata = nft_userdata(rule);
3368 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
3370 goto nla_put_failure;
3373 nlmsg_end(skb, nlh);
3377 nlmsg_trim(skb, nlh);
3381 static void nf_tables_rule_notify(const struct nft_ctx *ctx,
3382 const struct nft_rule *rule, int event)
3384 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
3385 const struct nft_rule *prule;
3386 struct sk_buff *skb;
3392 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
3395 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3399 if (event == NFT_MSG_NEWRULE &&
3400 !list_is_first(&rule->list, &ctx->chain->rules) &&
3401 !list_is_last(&rule->list, &ctx->chain->rules)) {
3402 prule = list_prev_entry(rule, list);
3403 handle = prule->handle;
3405 if (ctx->flags & (NLM_F_APPEND | NLM_F_REPLACE))
3406 flags |= NLM_F_APPEND;
3407 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
3408 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
3410 err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
3411 event, flags, ctx->family, ctx->table,
3412 ctx->chain, rule, handle, false);
3418 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
3421 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
3424 struct nft_rule_dump_ctx {
3429 static int __nf_tables_dump_rules(struct sk_buff *skb,
3431 struct netlink_callback *cb,
3432 const struct nft_table *table,
3433 const struct nft_chain *chain,
3436 struct net *net = sock_net(skb->sk);
3437 const struct nft_rule *rule, *prule;
3438 unsigned int s_idx = cb->args[0];
3442 list_for_each_entry_rcu(rule, &chain->rules, list) {
3443 if (!nft_is_active(net, rule))
3448 memset(&cb->args[1], 0,
3449 sizeof(cb->args) - sizeof(cb->args[0]));
3452 handle = prule->handle;
3456 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
3459 NLM_F_MULTI | NLM_F_APPEND,
3461 table, chain, rule, handle, reset) < 0)
3464 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3473 static int nf_tables_dump_rules(struct sk_buff *skb,
3474 struct netlink_callback *cb)
3476 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
3477 const struct nft_rule_dump_ctx *ctx = cb->data;
3478 struct nft_table *table;
3479 const struct nft_chain *chain;
3480 unsigned int idx = 0;
3481 struct net *net = sock_net(skb->sk);
3482 int family = nfmsg->nfgen_family;
3483 struct nftables_pernet *nft_net;
3486 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETRULE_RESET)
3490 nft_net = nft_pernet(net);
3491 cb->seq = READ_ONCE(nft_net->base_seq);
3493 list_for_each_entry_rcu(table, &nft_net->tables, list) {
3494 if (family != NFPROTO_UNSPEC && family != table->family)
3497 if (ctx && ctx->table && strcmp(ctx->table, table->name) != 0)
3500 if (ctx && ctx->table && ctx->chain) {
3501 struct rhlist_head *list, *tmp;
3503 list = rhltable_lookup(&table->chains_ht, ctx->chain,
3504 nft_chain_ht_params);
3508 rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
3509 if (!nft_is_active(net, chain))
3511 __nf_tables_dump_rules(skb, &idx,
3512 cb, table, chain, reset);
3518 list_for_each_entry_rcu(chain, &table->chains, list) {
3519 if (__nf_tables_dump_rules(skb, &idx,
3520 cb, table, chain, reset))
3524 if (ctx && ctx->table)
3534 static int nf_tables_dump_rules_start(struct netlink_callback *cb)
3536 const struct nlattr * const *nla = cb->data;
3537 struct nft_rule_dump_ctx *ctx = NULL;
3539 if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) {
3540 ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
3544 if (nla[NFTA_RULE_TABLE]) {
3545 ctx->table = nla_strdup(nla[NFTA_RULE_TABLE],
3552 if (nla[NFTA_RULE_CHAIN]) {
3553 ctx->chain = nla_strdup(nla[NFTA_RULE_CHAIN],
3567 static int nf_tables_dump_rules_done(struct netlink_callback *cb)
3569 struct nft_rule_dump_ctx *ctx = cb->data;
3579 /* called with rcu_read_lock held */
3580 static int nf_tables_getrule(struct sk_buff *skb, const struct nfnl_info *info,
3581 const struct nlattr * const nla[])
3583 struct netlink_ext_ack *extack = info->extack;
3584 u8 genmask = nft_genmask_cur(info->net);
3585 u8 family = info->nfmsg->nfgen_family;
3586 const struct nft_chain *chain;
3587 const struct nft_rule *rule;
3588 struct net *net = info->net;
3589 struct nft_table *table;
3590 struct sk_buff *skb2;
3594 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
3595 struct netlink_dump_control c = {
3596 .start= nf_tables_dump_rules_start,
3597 .dump = nf_tables_dump_rules,
3598 .done = nf_tables_dump_rules_done,
3599 .module = THIS_MODULE,
3600 .data = (void *)nla,
3603 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
3606 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask, 0);
3607 if (IS_ERR(table)) {
3608 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3609 return PTR_ERR(table);
3612 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask);
3613 if (IS_ERR(chain)) {
3614 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3615 return PTR_ERR(chain);
3618 rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
3620 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3621 return PTR_ERR(rule);
3624 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
3628 if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_GETRULE_RESET)
3631 err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
3632 info->nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
3633 family, table, chain, rule, 0, reset);
3635 goto err_fill_rule_info;
3637 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
3644 void nf_tables_rule_destroy(const struct nft_ctx *ctx, struct nft_rule *rule)
3646 struct nft_expr *expr, *next;
3649 * Careful: some expressions might not be initialized in case this
3650 * is called on error from nf_tables_newrule().
3652 expr = nft_expr_first(rule);
3653 while (nft_expr_more(rule, expr)) {
3654 next = nft_expr_next(expr);
3655 nf_tables_expr_destroy(ctx, expr);
3661 static void nf_tables_rule_release(const struct nft_ctx *ctx, struct nft_rule *rule)
3663 nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_RELEASE);
3664 nf_tables_rule_destroy(ctx, rule);
3667 int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain)
3669 struct nft_expr *expr, *last;
3670 const struct nft_data *data;
3671 struct nft_rule *rule;
3674 if (ctx->level == NFT_JUMP_STACK_SIZE)
3677 list_for_each_entry(rule, &chain->rules, list) {
3678 if (!nft_is_active_next(ctx->net, rule))
3681 nft_rule_for_each_expr(expr, last, rule) {
3682 if (!expr->ops->validate)
3685 err = expr->ops->validate(ctx, expr, &data);
3693 EXPORT_SYMBOL_GPL(nft_chain_validate);
3695 static int nft_table_validate(struct net *net, const struct nft_table *table)
3697 struct nft_chain *chain;
3698 struct nft_ctx ctx = {
3700 .family = table->family,
3704 list_for_each_entry(chain, &table->chains, list) {
3705 if (!nft_is_base_chain(chain))
3709 err = nft_chain_validate(&ctx, chain);
3719 int nft_setelem_validate(const struct nft_ctx *ctx, struct nft_set *set,
3720 const struct nft_set_iter *iter,
3721 struct nft_set_elem *elem)
3723 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
3724 struct nft_ctx *pctx = (struct nft_ctx *)ctx;
3725 const struct nft_data *data;
3728 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
3729 *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
3732 data = nft_set_ext_data(ext);
3733 switch (data->verdict.code) {
3737 err = nft_chain_validate(ctx, data->verdict.chain);
3749 int nft_set_catchall_validate(const struct nft_ctx *ctx, struct nft_set *set)
3751 u8 genmask = nft_genmask_next(ctx->net);
3752 struct nft_set_elem_catchall *catchall;
3753 struct nft_set_elem elem;
3754 struct nft_set_ext *ext;
3757 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
3758 ext = nft_set_elem_ext(set, catchall->elem);
3759 if (!nft_set_elem_active(ext, genmask))
3762 elem.priv = catchall->elem;
3763 ret = nft_setelem_validate(ctx, set, NULL, &elem);
3771 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3772 const struct nft_chain *chain,
3773 const struct nlattr *nla);
3775 #define NFT_RULE_MAXEXPRS 128
3777 static int nf_tables_newrule(struct sk_buff *skb, const struct nfnl_info *info,
3778 const struct nlattr * const nla[])
3780 struct nftables_pernet *nft_net = nft_pernet(info->net);
3781 struct netlink_ext_ack *extack = info->extack;
3782 unsigned int size, i, n, ulen = 0, usize = 0;
3783 u8 genmask = nft_genmask_next(info->net);
3784 struct nft_rule *rule, *old_rule = NULL;
3785 struct nft_expr_info *expr_info = NULL;
3786 u8 family = info->nfmsg->nfgen_family;
3787 struct nft_flow_rule *flow = NULL;
3788 struct net *net = info->net;
3789 struct nft_userdata *udata;
3790 struct nft_table *table;
3791 struct nft_chain *chain;
3792 struct nft_trans *trans;
3793 u64 handle, pos_handle;
3794 struct nft_expr *expr;
3799 lockdep_assert_held(&nft_net->commit_mutex);
3801 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
3802 NETLINK_CB(skb).portid);
3803 if (IS_ERR(table)) {
3804 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3805 return PTR_ERR(table);
3808 if (nla[NFTA_RULE_CHAIN]) {
3809 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3811 if (IS_ERR(chain)) {
3812 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3813 return PTR_ERR(chain);
3816 } else if (nla[NFTA_RULE_CHAIN_ID]) {
3817 chain = nft_chain_lookup_byid(net, table, nla[NFTA_RULE_CHAIN_ID],
3819 if (IS_ERR(chain)) {
3820 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN_ID]);
3821 return PTR_ERR(chain);
3827 if (nft_chain_is_bound(chain))
3830 if (nla[NFTA_RULE_HANDLE]) {
3831 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
3832 rule = __nft_rule_lookup(chain, handle);
3834 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3835 return PTR_ERR(rule);
3838 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
3839 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3842 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
3847 if (!(info->nlh->nlmsg_flags & NLM_F_CREATE) ||
3848 info->nlh->nlmsg_flags & NLM_F_REPLACE)
3850 handle = nf_tables_alloc_handle(table);
3852 if (nla[NFTA_RULE_POSITION]) {
3853 pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
3854 old_rule = __nft_rule_lookup(chain, pos_handle);
3855 if (IS_ERR(old_rule)) {
3856 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION]);
3857 return PTR_ERR(old_rule);
3859 } else if (nla[NFTA_RULE_POSITION_ID]) {
3860 old_rule = nft_rule_lookup_byid(net, chain, nla[NFTA_RULE_POSITION_ID]);
3861 if (IS_ERR(old_rule)) {
3862 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION_ID]);
3863 return PTR_ERR(old_rule);
3868 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
3872 if (nla[NFTA_RULE_EXPRESSIONS]) {
3873 expr_info = kvmalloc_array(NFT_RULE_MAXEXPRS,
3874 sizeof(struct nft_expr_info),
3879 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
3881 if (nla_type(tmp) != NFTA_LIST_ELEM)
3882 goto err_release_expr;
3883 if (n == NFT_RULE_MAXEXPRS)
3884 goto err_release_expr;
3885 err = nf_tables_expr_parse(&ctx, tmp, &expr_info[n]);
3887 NL_SET_BAD_ATTR(extack, tmp);
3888 goto err_release_expr;
3890 size += expr_info[n].ops->size;
3894 /* Check for overflow of dlen field */
3896 if (size >= 1 << 12)
3897 goto err_release_expr;
3899 if (nla[NFTA_RULE_USERDATA]) {
3900 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
3902 usize = sizeof(struct nft_userdata) + ulen;
3906 rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL_ACCOUNT);
3908 goto err_release_expr;
3910 nft_activate_next(net, rule);
3912 rule->handle = handle;
3914 rule->udata = ulen ? 1 : 0;
3917 udata = nft_userdata(rule);
3918 udata->len = ulen - 1;
3919 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
3922 expr = nft_expr_first(rule);
3923 for (i = 0; i < n; i++) {
3924 err = nf_tables_newexpr(&ctx, &expr_info[i], expr);
3926 NL_SET_BAD_ATTR(extack, expr_info[i].attr);
3927 goto err_release_rule;
3930 if (expr_info[i].ops->validate)
3931 nft_validate_state_update(table, NFT_VALIDATE_NEED);
3933 expr_info[i].ops = NULL;
3934 expr = nft_expr_next(expr);
3937 if (chain->flags & NFT_CHAIN_HW_OFFLOAD) {
3938 flow = nft_flow_rule_create(net, rule);
3940 err = PTR_ERR(flow);
3941 goto err_release_rule;
3945 if (!nft_use_inc(&chain->use)) {
3947 goto err_release_rule;
3950 if (info->nlh->nlmsg_flags & NLM_F_REPLACE) {
3951 err = nft_delrule(&ctx, old_rule);
3953 goto err_destroy_flow_rule;
3955 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
3956 if (trans == NULL) {
3958 goto err_destroy_flow_rule;
3960 list_add_tail_rcu(&rule->list, &old_rule->list);
3962 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
3965 goto err_destroy_flow_rule;
3968 if (info->nlh->nlmsg_flags & NLM_F_APPEND) {
3970 list_add_rcu(&rule->list, &old_rule->list);
3972 list_add_tail_rcu(&rule->list, &chain->rules);
3975 list_add_tail_rcu(&rule->list, &old_rule->list);
3977 list_add_rcu(&rule->list, &chain->rules);
3983 nft_trans_flow_rule(trans) = flow;
3985 if (table->validate_state == NFT_VALIDATE_DO)
3986 return nft_table_validate(net, table);
3990 err_destroy_flow_rule:
3991 nft_use_dec_restore(&chain->use);
3993 nft_flow_rule_destroy(flow);
3995 nft_rule_expr_deactivate(&ctx, rule, NFT_TRANS_PREPARE_ERROR);
3996 nf_tables_rule_destroy(&ctx, rule);
3998 for (i = 0; i < n; i++) {
3999 if (expr_info[i].ops) {
4000 module_put(expr_info[i].ops->type->owner);
4001 if (expr_info[i].ops->type->release_ops)
4002 expr_info[i].ops->type->release_ops(expr_info[i].ops);
4010 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
4011 const struct nft_chain *chain,
4012 const struct nlattr *nla)
4014 struct nftables_pernet *nft_net = nft_pernet(net);
4015 u32 id = ntohl(nla_get_be32(nla));
4016 struct nft_trans *trans;
4018 list_for_each_entry(trans, &nft_net->commit_list, list) {
4019 if (trans->msg_type == NFT_MSG_NEWRULE &&
4020 trans->ctx.chain == chain &&
4021 id == nft_trans_rule_id(trans))
4022 return nft_trans_rule(trans);
4024 return ERR_PTR(-ENOENT);
4027 static int nf_tables_delrule(struct sk_buff *skb, const struct nfnl_info *info,
4028 const struct nlattr * const nla[])
4030 struct netlink_ext_ack *extack = info->extack;
4031 u8 genmask = nft_genmask_next(info->net);
4032 u8 family = info->nfmsg->nfgen_family;
4033 struct nft_chain *chain = NULL;
4034 struct net *net = info->net;
4035 struct nft_table *table;
4036 struct nft_rule *rule;
4040 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
4041 NETLINK_CB(skb).portid);
4042 if (IS_ERR(table)) {
4043 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
4044 return PTR_ERR(table);
4047 if (nla[NFTA_RULE_CHAIN]) {
4048 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
4050 if (IS_ERR(chain)) {
4051 if (PTR_ERR(chain) == -ENOENT &&
4052 NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYRULE)
4055 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
4056 return PTR_ERR(chain);
4058 if (nft_chain_is_bound(chain))
4062 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
4065 if (nla[NFTA_RULE_HANDLE]) {
4066 rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
4068 if (PTR_ERR(rule) == -ENOENT &&
4069 NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYRULE)
4072 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
4073 return PTR_ERR(rule);
4076 err = nft_delrule(&ctx, rule);
4077 } else if (nla[NFTA_RULE_ID]) {
4078 rule = nft_rule_lookup_byid(net, chain, nla[NFTA_RULE_ID]);
4080 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_ID]);
4081 return PTR_ERR(rule);
4084 err = nft_delrule(&ctx, rule);
4086 err = nft_delrule_by_chain(&ctx);
4089 list_for_each_entry(chain, &table->chains, list) {
4090 if (!nft_is_active_next(net, chain))
4092 if (nft_chain_is_bound(chain))
4096 err = nft_delrule_by_chain(&ctx);
4108 static const struct nft_set_type *nft_set_types[] = {
4109 &nft_set_hash_fast_type,
4111 &nft_set_rhash_type,
4112 &nft_set_bitmap_type,
4113 &nft_set_rbtree_type,
4114 #if defined(CONFIG_X86_64) && !defined(CONFIG_UML)
4115 &nft_set_pipapo_avx2_type,
4117 &nft_set_pipapo_type,
4120 #define NFT_SET_FEATURES (NFT_SET_INTERVAL | NFT_SET_MAP | \
4121 NFT_SET_TIMEOUT | NFT_SET_OBJECT | \
4124 static bool nft_set_ops_candidate(const struct nft_set_type *type, u32 flags)
4126 return (flags & type->features) == (flags & NFT_SET_FEATURES);
4130 * Select a set implementation based on the data characteristics and the
4131 * given policy. The total memory use might not be known if no size is
4132 * given, in that case the amount of memory per element is used.
4134 static const struct nft_set_ops *
4135 nft_select_set_ops(const struct nft_ctx *ctx,
4136 const struct nlattr * const nla[],
4137 const struct nft_set_desc *desc)
4139 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
4140 const struct nft_set_ops *ops, *bops;
4141 struct nft_set_estimate est, best;
4142 const struct nft_set_type *type;
4146 lockdep_assert_held(&nft_net->commit_mutex);
4147 lockdep_nfnl_nft_mutex_not_held();
4149 if (nla[NFTA_SET_FLAGS] != NULL)
4150 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
4157 for (i = 0; i < ARRAY_SIZE(nft_set_types); i++) {
4158 type = nft_set_types[i];
4161 if (!nft_set_ops_candidate(type, flags))
4163 if (!ops->estimate(desc, flags, &est))
4166 switch (desc->policy) {
4167 case NFT_SET_POL_PERFORMANCE:
4168 if (est.lookup < best.lookup)
4170 if (est.lookup == best.lookup &&
4171 est.space < best.space)
4174 case NFT_SET_POL_MEMORY:
4176 if (est.space < best.space)
4178 if (est.space == best.space &&
4179 est.lookup < best.lookup)
4181 } else if (est.size < best.size || !bops) {
4196 return ERR_PTR(-EOPNOTSUPP);
4199 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
4200 [NFTA_SET_TABLE] = { .type = NLA_STRING,
4201 .len = NFT_TABLE_MAXNAMELEN - 1 },
4202 [NFTA_SET_NAME] = { .type = NLA_STRING,
4203 .len = NFT_SET_MAXNAMELEN - 1 },
4204 [NFTA_SET_FLAGS] = { .type = NLA_U32 },
4205 [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 },
4206 [NFTA_SET_KEY_LEN] = { .type = NLA_U32 },
4207 [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 },
4208 [NFTA_SET_DATA_LEN] = { .type = NLA_U32 },
4209 [NFTA_SET_POLICY] = { .type = NLA_U32 },
4210 [NFTA_SET_DESC] = { .type = NLA_NESTED },
4211 [NFTA_SET_ID] = { .type = NLA_U32 },
4212 [NFTA_SET_TIMEOUT] = { .type = NLA_U64 },
4213 [NFTA_SET_GC_INTERVAL] = { .type = NLA_U32 },
4214 [NFTA_SET_USERDATA] = { .type = NLA_BINARY,
4215 .len = NFT_USERDATA_MAXLEN },
4216 [NFTA_SET_OBJ_TYPE] = { .type = NLA_U32 },
4217 [NFTA_SET_HANDLE] = { .type = NLA_U64 },
4218 [NFTA_SET_EXPR] = { .type = NLA_NESTED },
4219 [NFTA_SET_EXPRESSIONS] = { .type = NLA_NESTED },
4222 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
4223 [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 },
4224 [NFTA_SET_DESC_CONCAT] = { .type = NLA_NESTED },
4227 static struct nft_set *nft_set_lookup(const struct nft_table *table,
4228 const struct nlattr *nla, u8 genmask)
4230 struct nft_set *set;
4233 return ERR_PTR(-EINVAL);
4235 list_for_each_entry_rcu(set, &table->sets, list) {
4236 if (!nla_strcmp(nla, set->name) &&
4237 nft_active_genmask(set, genmask))
4240 return ERR_PTR(-ENOENT);
4243 static struct nft_set *nft_set_lookup_byhandle(const struct nft_table *table,
4244 const struct nlattr *nla,
4247 struct nft_set *set;
4249 list_for_each_entry(set, &table->sets, list) {
4250 if (be64_to_cpu(nla_get_be64(nla)) == set->handle &&
4251 nft_active_genmask(set, genmask))
4254 return ERR_PTR(-ENOENT);
4257 static struct nft_set *nft_set_lookup_byid(const struct net *net,
4258 const struct nft_table *table,
4259 const struct nlattr *nla, u8 genmask)
4261 struct nftables_pernet *nft_net = nft_pernet(net);
4262 u32 id = ntohl(nla_get_be32(nla));
4263 struct nft_trans *trans;
4265 list_for_each_entry(trans, &nft_net->commit_list, list) {
4266 if (trans->msg_type == NFT_MSG_NEWSET) {
4267 struct nft_set *set = nft_trans_set(trans);
4269 if (id == nft_trans_set_id(trans) &&
4270 set->table == table &&
4271 nft_active_genmask(set, genmask))
4275 return ERR_PTR(-ENOENT);
4278 struct nft_set *nft_set_lookup_global(const struct net *net,
4279 const struct nft_table *table,
4280 const struct nlattr *nla_set_name,
4281 const struct nlattr *nla_set_id,
4284 struct nft_set *set;
4286 set = nft_set_lookup(table, nla_set_name, genmask);
4291 set = nft_set_lookup_byid(net, table, nla_set_id, genmask);
4295 EXPORT_SYMBOL_GPL(nft_set_lookup_global);
4297 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
4300 const struct nft_set *i;
4302 unsigned long *inuse;
4303 unsigned int n = 0, min = 0;
4305 p = strchr(name, '%');
4307 if (p[1] != 'd' || strchr(p + 2, '%'))
4310 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
4314 list_for_each_entry(i, &ctx->table->sets, list) {
4317 if (!nft_is_active_next(ctx->net, i))
4319 if (!sscanf(i->name, name, &tmp))
4321 if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
4324 set_bit(tmp - min, inuse);
4327 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
4328 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
4329 min += BITS_PER_BYTE * PAGE_SIZE;
4330 memset(inuse, 0, PAGE_SIZE);
4333 free_page((unsigned long)inuse);
4336 set->name = kasprintf(GFP_KERNEL_ACCOUNT, name, min + n);
4340 list_for_each_entry(i, &ctx->table->sets, list) {
4341 if (!nft_is_active_next(ctx->net, i))
4343 if (!strcmp(set->name, i->name)) {
4352 int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result)
4354 u64 ms = be64_to_cpu(nla_get_be64(nla));
4355 u64 max = (u64)(~((u64)0));
4357 max = div_u64(max, NSEC_PER_MSEC);
4361 ms *= NSEC_PER_MSEC;
4362 *result = nsecs_to_jiffies64(ms);
4366 __be64 nf_jiffies64_to_msecs(u64 input)
4368 return cpu_to_be64(jiffies64_to_msecs(input));
4371 static int nf_tables_fill_set_concat(struct sk_buff *skb,
4372 const struct nft_set *set)
4374 struct nlattr *concat, *field;
4377 concat = nla_nest_start_noflag(skb, NFTA_SET_DESC_CONCAT);
4381 for (i = 0; i < set->field_count; i++) {
4382 field = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
4386 if (nla_put_be32(skb, NFTA_SET_FIELD_LEN,
4387 htonl(set->field_len[i])))
4390 nla_nest_end(skb, field);
4393 nla_nest_end(skb, concat);
4398 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
4399 const struct nft_set *set, u16 event, u16 flags)
4401 u64 timeout = READ_ONCE(set->timeout);
4402 u32 gc_int = READ_ONCE(set->gc_int);
4403 u32 portid = ctx->portid;
4404 struct nlmsghdr *nlh;
4405 struct nlattr *nest;
4409 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
4410 nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
4411 NFNETLINK_V0, nft_base_seq(ctx->net));
4413 goto nla_put_failure;
4415 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
4416 goto nla_put_failure;
4417 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
4418 goto nla_put_failure;
4419 if (nla_put_be64(skb, NFTA_SET_HANDLE, cpu_to_be64(set->handle),
4421 goto nla_put_failure;
4423 if (event == NFT_MSG_DELSET) {
4424 nlmsg_end(skb, nlh);
4428 if (set->flags != 0)
4429 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
4430 goto nla_put_failure;
4432 if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
4433 goto nla_put_failure;
4434 if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
4435 goto nla_put_failure;
4436 if (set->flags & NFT_SET_MAP) {
4437 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
4438 goto nla_put_failure;
4439 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
4440 goto nla_put_failure;
4442 if (set->flags & NFT_SET_OBJECT &&
4443 nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
4444 goto nla_put_failure;
4447 nla_put_be64(skb, NFTA_SET_TIMEOUT,
4448 nf_jiffies64_to_msecs(timeout),
4450 goto nla_put_failure;
4452 nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(gc_int)))
4453 goto nla_put_failure;
4455 if (set->policy != NFT_SET_POL_PERFORMANCE) {
4456 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
4457 goto nla_put_failure;
4461 nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
4462 goto nla_put_failure;
4464 nest = nla_nest_start_noflag(skb, NFTA_SET_DESC);
4466 goto nla_put_failure;
4468 nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
4469 goto nla_put_failure;
4471 if (set->field_count > 1 &&
4472 nf_tables_fill_set_concat(skb, set))
4473 goto nla_put_failure;
4475 nla_nest_end(skb, nest);
4477 if (set->num_exprs == 1) {
4478 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPR);
4479 if (nf_tables_fill_expr_info(skb, set->exprs[0], false) < 0)
4480 goto nla_put_failure;
4482 nla_nest_end(skb, nest);
4483 } else if (set->num_exprs > 1) {
4484 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPRESSIONS);
4486 goto nla_put_failure;
4488 for (i = 0; i < set->num_exprs; i++) {
4489 if (nft_expr_dump(skb, NFTA_LIST_ELEM,
4490 set->exprs[i], false) < 0)
4491 goto nla_put_failure;
4493 nla_nest_end(skb, nest);
4496 nlmsg_end(skb, nlh);
4500 nlmsg_trim(skb, nlh);
4504 static void nf_tables_set_notify(const struct nft_ctx *ctx,
4505 const struct nft_set *set, int event,
4508 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
4509 u32 portid = ctx->portid;
4510 struct sk_buff *skb;
4515 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
4518 skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
4522 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
4523 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
4525 err = nf_tables_fill_set(skb, ctx, set, event, flags);
4531 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
4534 nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
4537 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
4539 const struct nft_set *set;
4540 unsigned int idx, s_idx = cb->args[0];
4541 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
4542 struct net *net = sock_net(skb->sk);
4543 struct nft_ctx *ctx = cb->data, ctx_set;
4544 struct nftables_pernet *nft_net;
4550 nft_net = nft_pernet(net);
4551 cb->seq = READ_ONCE(nft_net->base_seq);
4553 list_for_each_entry_rcu(table, &nft_net->tables, list) {
4554 if (ctx->family != NFPROTO_UNSPEC &&
4555 ctx->family != table->family)
4558 if (ctx->table && ctx->table != table)
4562 if (cur_table != table)
4568 list_for_each_entry_rcu(set, &table->sets, list) {
4571 if (!nft_is_active(net, set))
4575 ctx_set.table = table;
4576 ctx_set.family = table->family;
4578 if (nf_tables_fill_set(skb, &ctx_set, set,
4582 cb->args[2] = (unsigned long) table;
4585 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4598 static int nf_tables_dump_sets_start(struct netlink_callback *cb)
4600 struct nft_ctx *ctx_dump = NULL;
4602 ctx_dump = kmemdup(cb->data, sizeof(*ctx_dump), GFP_ATOMIC);
4603 if (ctx_dump == NULL)
4606 cb->data = ctx_dump;
4610 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
4616 /* called with rcu_read_lock held */
4617 static int nf_tables_getset(struct sk_buff *skb, const struct nfnl_info *info,
4618 const struct nlattr * const nla[])
4620 struct netlink_ext_ack *extack = info->extack;
4621 u8 genmask = nft_genmask_cur(info->net);
4622 u8 family = info->nfmsg->nfgen_family;
4623 struct nft_table *table = NULL;
4624 struct net *net = info->net;
4625 const struct nft_set *set;
4626 struct sk_buff *skb2;
4630 if (nla[NFTA_SET_TABLE]) {
4631 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
4633 if (IS_ERR(table)) {
4634 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4635 return PTR_ERR(table);
4639 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4641 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
4642 struct netlink_dump_control c = {
4643 .start = nf_tables_dump_sets_start,
4644 .dump = nf_tables_dump_sets,
4645 .done = nf_tables_dump_sets_done,
4647 .module = THIS_MODULE,
4650 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
4653 /* Only accept unspec with dump */
4654 if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
4655 return -EAFNOSUPPORT;
4656 if (!nla[NFTA_SET_TABLE])
4659 set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
4661 return PTR_ERR(set);
4663 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
4667 err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
4669 goto err_fill_set_info;
4671 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
4678 static const struct nla_policy nft_concat_policy[NFTA_SET_FIELD_MAX + 1] = {
4679 [NFTA_SET_FIELD_LEN] = { .type = NLA_U32 },
4682 static int nft_set_desc_concat_parse(const struct nlattr *attr,
4683 struct nft_set_desc *desc)
4685 struct nlattr *tb[NFTA_SET_FIELD_MAX + 1];
4689 if (desc->field_count >= ARRAY_SIZE(desc->field_len))
4692 err = nla_parse_nested_deprecated(tb, NFTA_SET_FIELD_MAX, attr,
4693 nft_concat_policy, NULL);
4697 if (!tb[NFTA_SET_FIELD_LEN])
4700 len = ntohl(nla_get_be32(tb[NFTA_SET_FIELD_LEN]));
4701 if (!len || len > U8_MAX)
4704 desc->field_len[desc->field_count++] = len;
4709 static int nft_set_desc_concat(struct nft_set_desc *desc,
4710 const struct nlattr *nla)
4712 struct nlattr *attr;
4716 nla_for_each_nested(attr, nla, rem) {
4717 if (nla_type(attr) != NFTA_LIST_ELEM)
4720 err = nft_set_desc_concat_parse(attr, desc);
4725 for (i = 0; i < desc->field_count; i++)
4726 num_regs += DIV_ROUND_UP(desc->field_len[i], sizeof(u32));
4728 if (num_regs > NFT_REG32_COUNT)
4734 static int nf_tables_set_desc_parse(struct nft_set_desc *desc,
4735 const struct nlattr *nla)
4737 struct nlattr *da[NFTA_SET_DESC_MAX + 1];
4740 err = nla_parse_nested_deprecated(da, NFTA_SET_DESC_MAX, nla,
4741 nft_set_desc_policy, NULL);
4745 if (da[NFTA_SET_DESC_SIZE] != NULL)
4746 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
4747 if (da[NFTA_SET_DESC_CONCAT])
4748 err = nft_set_desc_concat(desc, da[NFTA_SET_DESC_CONCAT]);
4753 static int nft_set_expr_alloc(struct nft_ctx *ctx, struct nft_set *set,
4754 const struct nlattr * const *nla,
4755 struct nft_expr **exprs, int *num_exprs,
4758 struct nft_expr *expr;
4761 if (nla[NFTA_SET_EXPR]) {
4762 expr = nft_set_elem_expr_alloc(ctx, set, nla[NFTA_SET_EXPR]);
4764 err = PTR_ERR(expr);
4765 goto err_set_expr_alloc;
4769 } else if (nla[NFTA_SET_EXPRESSIONS]) {
4773 if (!(flags & NFT_SET_EXPR)) {
4775 goto err_set_expr_alloc;
4778 nla_for_each_nested(tmp, nla[NFTA_SET_EXPRESSIONS], left) {
4779 if (i == NFT_SET_EXPR_MAX) {
4781 goto err_set_expr_alloc;
4783 if (nla_type(tmp) != NFTA_LIST_ELEM) {
4785 goto err_set_expr_alloc;
4787 expr = nft_set_elem_expr_alloc(ctx, set, tmp);
4789 err = PTR_ERR(expr);
4790 goto err_set_expr_alloc;
4800 for (i = 0; i < *num_exprs; i++)
4801 nft_expr_destroy(ctx, exprs[i]);
4806 static bool nft_set_is_same(const struct nft_set *set,
4807 const struct nft_set_desc *desc,
4808 struct nft_expr *exprs[], u32 num_exprs, u32 flags)
4812 if (set->ktype != desc->ktype ||
4813 set->dtype != desc->dtype ||
4814 set->flags != flags ||
4815 set->klen != desc->klen ||
4816 set->dlen != desc->dlen ||
4817 set->field_count != desc->field_count ||
4818 set->num_exprs != num_exprs)
4821 for (i = 0; i < desc->field_count; i++) {
4822 if (set->field_len[i] != desc->field_len[i])
4826 for (i = 0; i < num_exprs; i++) {
4827 if (set->exprs[i]->ops != exprs[i]->ops)
4834 static int nf_tables_newset(struct sk_buff *skb, const struct nfnl_info *info,
4835 const struct nlattr * const nla[])
4837 struct netlink_ext_ack *extack = info->extack;
4838 u8 genmask = nft_genmask_next(info->net);
4839 u8 family = info->nfmsg->nfgen_family;
4840 const struct nft_set_ops *ops;
4841 struct net *net = info->net;
4842 struct nft_set_desc desc;
4843 struct nft_table *table;
4844 unsigned char *udata;
4845 struct nft_set *set;
4855 if (nla[NFTA_SET_TABLE] == NULL ||
4856 nla[NFTA_SET_NAME] == NULL ||
4857 nla[NFTA_SET_KEY_LEN] == NULL ||
4858 nla[NFTA_SET_ID] == NULL)
4861 memset(&desc, 0, sizeof(desc));
4863 desc.ktype = NFT_DATA_VALUE;
4864 if (nla[NFTA_SET_KEY_TYPE] != NULL) {
4865 desc.ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
4866 if ((desc.ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
4870 desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
4871 if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
4875 if (nla[NFTA_SET_FLAGS] != NULL) {
4876 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
4877 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
4878 NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
4879 NFT_SET_MAP | NFT_SET_EVAL |
4880 NFT_SET_OBJECT | NFT_SET_CONCAT | NFT_SET_EXPR))
4882 /* Only one of these operations is supported */
4883 if ((flags & (NFT_SET_MAP | NFT_SET_OBJECT)) ==
4884 (NFT_SET_MAP | NFT_SET_OBJECT))
4886 if ((flags & (NFT_SET_EVAL | NFT_SET_OBJECT)) ==
4887 (NFT_SET_EVAL | NFT_SET_OBJECT))
4892 if (nla[NFTA_SET_DATA_TYPE] != NULL) {
4893 if (!(flags & NFT_SET_MAP))
4896 desc.dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
4897 if ((desc.dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
4898 desc.dtype != NFT_DATA_VERDICT)
4901 if (desc.dtype != NFT_DATA_VERDICT) {
4902 if (nla[NFTA_SET_DATA_LEN] == NULL)
4904 desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
4905 if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
4908 desc.dlen = sizeof(struct nft_verdict);
4909 } else if (flags & NFT_SET_MAP)
4912 if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
4913 if (!(flags & NFT_SET_OBJECT))
4916 desc.objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
4917 if (desc.objtype == NFT_OBJECT_UNSPEC ||
4918 desc.objtype > NFT_OBJECT_MAX)
4920 } else if (flags & NFT_SET_OBJECT)
4923 desc.objtype = NFT_OBJECT_UNSPEC;
4926 if (nla[NFTA_SET_TIMEOUT] != NULL) {
4927 if (!(flags & NFT_SET_TIMEOUT))
4930 if (flags & NFT_SET_ANONYMOUS)
4933 err = nf_msecs_to_jiffies64(nla[NFTA_SET_TIMEOUT], &desc.timeout);
4938 if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
4939 if (!(flags & NFT_SET_TIMEOUT))
4942 if (flags & NFT_SET_ANONYMOUS)
4945 desc.gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
4948 desc.policy = NFT_SET_POL_PERFORMANCE;
4949 if (nla[NFTA_SET_POLICY] != NULL)
4950 desc.policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
4952 if (nla[NFTA_SET_DESC] != NULL) {
4953 err = nf_tables_set_desc_parse(&desc, nla[NFTA_SET_DESC]);
4957 if (desc.field_count > 1 && !(flags & NFT_SET_CONCAT))
4959 } else if (flags & NFT_SET_CONCAT) {
4963 if (nla[NFTA_SET_EXPR] || nla[NFTA_SET_EXPRESSIONS])
4966 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, genmask,
4967 NETLINK_CB(skb).portid);
4968 if (IS_ERR(table)) {
4969 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4970 return PTR_ERR(table);
4973 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4975 set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
4977 if (PTR_ERR(set) != -ENOENT) {
4978 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4979 return PTR_ERR(set);
4982 struct nft_expr *exprs[NFT_SET_EXPR_MAX] = {};
4984 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
4985 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4988 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
4991 if (nft_set_is_anonymous(set))
4994 err = nft_set_expr_alloc(&ctx, set, nla, exprs, &num_exprs, flags);
4999 if (!nft_set_is_same(set, &desc, exprs, num_exprs, flags)) {
5000 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
5004 for (i = 0; i < num_exprs; i++)
5005 nft_expr_destroy(&ctx, exprs[i]);
5010 return __nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set, &desc);
5013 if (!(info->nlh->nlmsg_flags & NLM_F_CREATE))
5016 ops = nft_select_set_ops(&ctx, nla, &desc);
5018 return PTR_ERR(ops);
5021 if (nla[NFTA_SET_USERDATA])
5022 udlen = nla_len(nla[NFTA_SET_USERDATA]);
5025 if (ops->privsize != NULL)
5026 size = ops->privsize(nla, &desc);
5027 alloc_size = sizeof(*set) + size + udlen;
5028 if (alloc_size < size || alloc_size > INT_MAX)
5031 if (!nft_use_inc(&table->use))
5034 set = kvzalloc(alloc_size, GFP_KERNEL_ACCOUNT);
5040 name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL_ACCOUNT);
5046 err = nf_tables_set_alloc_name(&ctx, set, name);
5053 udata = set->data + size;
5054 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
5057 INIT_LIST_HEAD(&set->bindings);
5058 INIT_LIST_HEAD(&set->catchall_list);
5059 refcount_set(&set->refs, 1);
5061 write_pnet(&set->net, net);
5063 set->ktype = desc.ktype;
5064 set->klen = desc.klen;
5065 set->dtype = desc.dtype;
5066 set->objtype = desc.objtype;
5067 set->dlen = desc.dlen;
5069 set->size = desc.size;
5070 set->policy = desc.policy;
5073 set->timeout = desc.timeout;
5074 set->gc_int = desc.gc_int;
5076 set->field_count = desc.field_count;
5077 for (i = 0; i < desc.field_count; i++)
5078 set->field_len[i] = desc.field_len[i];
5080 err = ops->init(set, &desc, nla);
5084 err = nft_set_expr_alloc(&ctx, set, nla, set->exprs, &num_exprs, flags);
5086 goto err_set_destroy;
5088 set->num_exprs = num_exprs;
5089 set->handle = nf_tables_alloc_handle(table);
5090 INIT_LIST_HEAD(&set->pending_update);
5092 err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
5094 goto err_set_expr_alloc;
5096 list_add_tail_rcu(&set->list, &table->sets);
5101 for (i = 0; i < set->num_exprs; i++)
5102 nft_expr_destroy(&ctx, set->exprs[i]);
5104 ops->destroy(&ctx, set);
5110 nft_use_dec_restore(&table->use);
5115 static void nft_set_catchall_destroy(const struct nft_ctx *ctx,
5116 struct nft_set *set)
5118 struct nft_set_elem_catchall *next, *catchall;
5120 list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
5121 list_del_rcu(&catchall->list);
5122 nf_tables_set_elem_destroy(ctx, set, catchall->elem);
5123 kfree_rcu(catchall, rcu);
5127 static void nft_set_put(struct nft_set *set)
5129 if (refcount_dec_and_test(&set->refs)) {
5135 static void nft_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
5139 if (WARN_ON(set->use > 0))
5142 for (i = 0; i < set->num_exprs; i++)
5143 nft_expr_destroy(ctx, set->exprs[i]);
5145 set->ops->destroy(ctx, set);
5146 nft_set_catchall_destroy(ctx, set);
5150 static int nf_tables_delset(struct sk_buff *skb, const struct nfnl_info *info,
5151 const struct nlattr * const nla[])
5153 struct netlink_ext_ack *extack = info->extack;
5154 u8 genmask = nft_genmask_next(info->net);
5155 u8 family = info->nfmsg->nfgen_family;
5156 struct net *net = info->net;
5157 const struct nlattr *attr;
5158 struct nft_table *table;
5159 struct nft_set *set;
5162 if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
5163 return -EAFNOSUPPORT;
5165 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
5166 genmask, NETLINK_CB(skb).portid);
5167 if (IS_ERR(table)) {
5168 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
5169 return PTR_ERR(table);
5172 if (nla[NFTA_SET_HANDLE]) {
5173 attr = nla[NFTA_SET_HANDLE];
5174 set = nft_set_lookup_byhandle(table, attr, genmask);
5176 attr = nla[NFTA_SET_NAME];
5177 set = nft_set_lookup(table, attr, genmask);
5181 if (PTR_ERR(set) == -ENOENT &&
5182 NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYSET)
5185 NL_SET_BAD_ATTR(extack, attr);
5186 return PTR_ERR(set);
5189 (info->nlh->nlmsg_flags & NLM_F_NONREC &&
5190 atomic_read(&set->nelems) > 0)) {
5191 NL_SET_BAD_ATTR(extack, attr);
5195 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
5197 return nft_delset(&ctx, set);
5200 static int nft_validate_register_store(const struct nft_ctx *ctx,
5201 enum nft_registers reg,
5202 const struct nft_data *data,
5203 enum nft_data_types type,
5206 static int nft_setelem_data_validate(const struct nft_ctx *ctx,
5207 struct nft_set *set,
5208 struct nft_set_elem *elem)
5210 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5211 enum nft_registers dreg;
5213 dreg = nft_type_to_reg(set->dtype);
5214 return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
5215 set->dtype == NFT_DATA_VERDICT ?
5216 NFT_DATA_VERDICT : NFT_DATA_VALUE,
5220 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
5221 struct nft_set *set,
5222 const struct nft_set_iter *iter,
5223 struct nft_set_elem *elem)
5225 return nft_setelem_data_validate(ctx, set, elem);
5228 static int nft_set_catchall_bind_check(const struct nft_ctx *ctx,
5229 struct nft_set *set)
5231 u8 genmask = nft_genmask_next(ctx->net);
5232 struct nft_set_elem_catchall *catchall;
5233 struct nft_set_elem elem;
5234 struct nft_set_ext *ext;
5237 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5238 ext = nft_set_elem_ext(set, catchall->elem);
5239 if (!nft_set_elem_active(ext, genmask))
5242 elem.priv = catchall->elem;
5243 ret = nft_setelem_data_validate(ctx, set, &elem);
5251 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
5252 struct nft_set_binding *binding)
5254 struct nft_set_binding *i;
5255 struct nft_set_iter iter;
5257 if (!list_empty(&set->bindings) && nft_set_is_anonymous(set))
5260 if (binding->flags & NFT_SET_MAP) {
5261 /* If the set is already bound to the same chain all
5262 * jumps are already validated for that chain.
5264 list_for_each_entry(i, &set->bindings, list) {
5265 if (i->flags & NFT_SET_MAP &&
5266 i->chain == binding->chain)
5270 iter.genmask = nft_genmask_next(ctx->net);
5274 iter.fn = nf_tables_bind_check_setelem;
5276 set->ops->walk(ctx, set, &iter);
5278 iter.err = nft_set_catchall_bind_check(ctx, set);
5284 if (!nft_use_inc(&set->use))
5287 binding->chain = ctx->chain;
5288 list_add_tail_rcu(&binding->list, &set->bindings);
5289 nft_set_trans_bind(ctx, set);
5293 EXPORT_SYMBOL_GPL(nf_tables_bind_set);
5295 static void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
5296 struct nft_set_binding *binding, bool event)
5298 list_del_rcu(&binding->list);
5300 if (list_empty(&set->bindings) && nft_set_is_anonymous(set)) {
5301 list_del_rcu(&set->list);
5303 nf_tables_set_notify(ctx, set, NFT_MSG_DELSET,
5308 static void nft_setelem_data_activate(const struct net *net,
5309 const struct nft_set *set,
5310 struct nft_set_elem *elem);
5312 static int nft_mapelem_activate(const struct nft_ctx *ctx,
5313 struct nft_set *set,
5314 const struct nft_set_iter *iter,
5315 struct nft_set_elem *elem)
5317 nft_setelem_data_activate(ctx->net, set, elem);
5322 static void nft_map_catchall_activate(const struct nft_ctx *ctx,
5323 struct nft_set *set)
5325 u8 genmask = nft_genmask_next(ctx->net);
5326 struct nft_set_elem_catchall *catchall;
5327 struct nft_set_elem elem;
5328 struct nft_set_ext *ext;
5330 list_for_each_entry(catchall, &set->catchall_list, list) {
5331 ext = nft_set_elem_ext(set, catchall->elem);
5332 if (!nft_set_elem_active(ext, genmask))
5335 elem.priv = catchall->elem;
5336 nft_setelem_data_activate(ctx->net, set, &elem);
5341 static void nft_map_activate(const struct nft_ctx *ctx, struct nft_set *set)
5343 struct nft_set_iter iter = {
5344 .genmask = nft_genmask_next(ctx->net),
5345 .fn = nft_mapelem_activate,
5348 set->ops->walk(ctx, set, &iter);
5349 WARN_ON_ONCE(iter.err);
5351 nft_map_catchall_activate(ctx, set);
5354 void nf_tables_activate_set(const struct nft_ctx *ctx, struct nft_set *set)
5356 if (nft_set_is_anonymous(set)) {
5357 if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
5358 nft_map_activate(ctx, set);
5360 nft_clear(ctx->net, set);
5363 nft_use_inc_restore(&set->use);
5365 EXPORT_SYMBOL_GPL(nf_tables_activate_set);
5367 void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set,
5368 struct nft_set_binding *binding,
5369 enum nft_trans_phase phase)
5372 case NFT_TRANS_PREPARE_ERROR:
5373 nft_set_trans_unbind(ctx, set);
5374 if (nft_set_is_anonymous(set))
5375 nft_deactivate_next(ctx->net, set);
5377 list_del_rcu(&binding->list);
5379 nft_use_dec(&set->use);
5381 case NFT_TRANS_PREPARE:
5382 if (nft_set_is_anonymous(set)) {
5383 if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
5384 nft_map_deactivate(ctx, set);
5386 nft_deactivate_next(ctx->net, set);
5388 nft_use_dec(&set->use);
5390 case NFT_TRANS_ABORT:
5391 case NFT_TRANS_RELEASE:
5392 if (nft_set_is_anonymous(set) &&
5393 set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
5394 nft_map_deactivate(ctx, set);
5396 nft_use_dec(&set->use);
5399 nf_tables_unbind_set(ctx, set, binding,
5400 phase == NFT_TRANS_COMMIT);
5403 EXPORT_SYMBOL_GPL(nf_tables_deactivate_set);
5405 void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set)
5407 if (list_empty(&set->bindings) && nft_set_is_anonymous(set))
5408 nft_set_destroy(ctx, set);
5410 EXPORT_SYMBOL_GPL(nf_tables_destroy_set);
5412 const struct nft_set_ext_type nft_set_ext_types[] = {
5413 [NFT_SET_EXT_KEY] = {
5414 .align = __alignof__(u32),
5416 [NFT_SET_EXT_DATA] = {
5417 .align = __alignof__(u32),
5419 [NFT_SET_EXT_EXPRESSIONS] = {
5420 .align = __alignof__(struct nft_set_elem_expr),
5422 [NFT_SET_EXT_OBJREF] = {
5423 .len = sizeof(struct nft_object *),
5424 .align = __alignof__(struct nft_object *),
5426 [NFT_SET_EXT_FLAGS] = {
5428 .align = __alignof__(u8),
5430 [NFT_SET_EXT_TIMEOUT] = {
5432 .align = __alignof__(u64),
5434 [NFT_SET_EXT_EXPIRATION] = {
5436 .align = __alignof__(u64),
5438 [NFT_SET_EXT_USERDATA] = {
5439 .len = sizeof(struct nft_userdata),
5440 .align = __alignof__(struct nft_userdata),
5442 [NFT_SET_EXT_KEY_END] = {
5443 .align = __alignof__(u32),
5451 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
5452 [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED },
5453 [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED },
5454 [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 },
5455 [NFTA_SET_ELEM_TIMEOUT] = { .type = NLA_U64 },
5456 [NFTA_SET_ELEM_EXPIRATION] = { .type = NLA_U64 },
5457 [NFTA_SET_ELEM_USERDATA] = { .type = NLA_BINARY,
5458 .len = NFT_USERDATA_MAXLEN },
5459 [NFTA_SET_ELEM_EXPR] = { .type = NLA_NESTED },
5460 [NFTA_SET_ELEM_OBJREF] = { .type = NLA_STRING,
5461 .len = NFT_OBJ_MAXNAMELEN - 1 },
5462 [NFTA_SET_ELEM_KEY_END] = { .type = NLA_NESTED },
5463 [NFTA_SET_ELEM_EXPRESSIONS] = { .type = NLA_NESTED },
5466 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
5467 [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING,
5468 .len = NFT_TABLE_MAXNAMELEN - 1 },
5469 [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING,
5470 .len = NFT_SET_MAXNAMELEN - 1 },
5471 [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED },
5472 [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 },
5475 static int nft_set_elem_expr_dump(struct sk_buff *skb,
5476 const struct nft_set *set,
5477 const struct nft_set_ext *ext,
5480 struct nft_set_elem_expr *elem_expr;
5481 u32 size, num_exprs = 0;
5482 struct nft_expr *expr;
5483 struct nlattr *nest;
5485 elem_expr = nft_set_ext_expr(ext);
5486 nft_setelem_expr_foreach(expr, elem_expr, size)
5489 if (num_exprs == 1) {
5490 expr = nft_setelem_expr_at(elem_expr, 0);
5491 if (nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, expr, reset) < 0)
5495 } else if (num_exprs > 1) {
5496 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_EXPRESSIONS);
5498 goto nla_put_failure;
5500 nft_setelem_expr_foreach(expr, elem_expr, size) {
5501 expr = nft_setelem_expr_at(elem_expr, size);
5502 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr, reset) < 0)
5503 goto nla_put_failure;
5505 nla_nest_end(skb, nest);
5513 static int nf_tables_fill_setelem(struct sk_buff *skb,
5514 const struct nft_set *set,
5515 const struct nft_set_elem *elem,
5518 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5519 unsigned char *b = skb_tail_pointer(skb);
5520 struct nlattr *nest;
5523 nest = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
5525 goto nla_put_failure;
5527 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) &&
5528 nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
5529 NFT_DATA_VALUE, set->klen) < 0)
5530 goto nla_put_failure;
5532 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
5533 nft_data_dump(skb, NFTA_SET_ELEM_KEY_END, nft_set_ext_key_end(ext),
5534 NFT_DATA_VALUE, set->klen) < 0)
5535 goto nla_put_failure;
5537 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
5538 nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
5539 set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
5541 goto nla_put_failure;
5543 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS) &&
5544 nft_set_elem_expr_dump(skb, set, ext, reset))
5545 goto nla_put_failure;
5547 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
5548 nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
5549 (*nft_set_ext_obj(ext))->key.name) < 0)
5550 goto nla_put_failure;
5552 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
5553 nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
5554 htonl(*nft_set_ext_flags(ext))))
5555 goto nla_put_failure;
5557 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT)) {
5558 timeout = *nft_set_ext_timeout(ext);
5559 if (nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
5560 nf_jiffies64_to_msecs(timeout),
5562 goto nla_put_failure;
5563 } else if (set->flags & NFT_SET_TIMEOUT) {
5564 timeout = READ_ONCE(set->timeout);
5567 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
5568 u64 expires, now = get_jiffies_64();
5570 expires = *nft_set_ext_expiration(ext);
5571 if (time_before64(now, expires))
5576 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
5577 nf_jiffies64_to_msecs(expires),
5579 goto nla_put_failure;
5582 *nft_set_ext_expiration(ext) = now + timeout;
5585 if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
5586 struct nft_userdata *udata;
5588 udata = nft_set_ext_userdata(ext);
5589 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
5590 udata->len + 1, udata->data))
5591 goto nla_put_failure;
5594 nla_nest_end(skb, nest);
5602 struct nft_set_dump_args {
5603 const struct netlink_callback *cb;
5604 struct nft_set_iter iter;
5605 struct sk_buff *skb;
5609 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
5610 struct nft_set *set,
5611 const struct nft_set_iter *iter,
5612 struct nft_set_elem *elem)
5614 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5615 struct nft_set_dump_args *args;
5617 if (nft_set_elem_expired(ext))
5620 args = container_of(iter, struct nft_set_dump_args, iter);
5621 return nf_tables_fill_setelem(args->skb, set, elem, args->reset);
5624 struct nft_set_dump_ctx {
5625 const struct nft_set *set;
5629 static int nft_set_catchall_dump(struct net *net, struct sk_buff *skb,
5630 const struct nft_set *set, bool reset)
5632 struct nft_set_elem_catchall *catchall;
5633 u8 genmask = nft_genmask_cur(net);
5634 struct nft_set_elem elem;
5635 struct nft_set_ext *ext;
5638 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5639 ext = nft_set_elem_ext(set, catchall->elem);
5640 if (!nft_set_elem_active(ext, genmask) ||
5641 nft_set_elem_expired(ext))
5644 elem.priv = catchall->elem;
5645 ret = nf_tables_fill_setelem(skb, set, &elem, reset);
5652 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
5654 struct nft_set_dump_ctx *dump_ctx = cb->data;
5655 struct net *net = sock_net(skb->sk);
5656 struct nftables_pernet *nft_net;
5657 struct nft_table *table;
5658 struct nft_set *set;
5659 struct nft_set_dump_args args;
5660 bool set_found = false;
5661 struct nlmsghdr *nlh;
5662 struct nlattr *nest;
5668 nft_net = nft_pernet(net);
5669 cb->seq = READ_ONCE(nft_net->base_seq);
5671 list_for_each_entry_rcu(table, &nft_net->tables, list) {
5672 if (dump_ctx->ctx.family != NFPROTO_UNSPEC &&
5673 dump_ctx->ctx.family != table->family)
5676 if (table != dump_ctx->ctx.table)
5679 list_for_each_entry_rcu(set, &table->sets, list) {
5680 if (set == dump_ctx->set) {
5693 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM);
5694 portid = NETLINK_CB(cb->skb).portid;
5695 seq = cb->nlh->nlmsg_seq;
5697 nlh = nfnl_msg_put(skb, portid, seq, event, NLM_F_MULTI,
5698 table->family, NFNETLINK_V0, nft_base_seq(net));
5700 goto nla_put_failure;
5702 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name))
5703 goto nla_put_failure;
5704 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
5705 goto nla_put_failure;
5707 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
5709 goto nla_put_failure;
5711 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETSETELEM_RESET)
5717 args.iter.genmask = nft_genmask_cur(net);
5718 args.iter.skip = cb->args[0];
5719 args.iter.count = 0;
5721 args.iter.fn = nf_tables_dump_setelem;
5722 set->ops->walk(&dump_ctx->ctx, set, &args.iter);
5724 if (!args.iter.err && args.iter.count == cb->args[0])
5725 args.iter.err = nft_set_catchall_dump(net, skb, set, reset);
5728 nla_nest_end(skb, nest);
5729 nlmsg_end(skb, nlh);
5731 if (args.iter.err && args.iter.err != -EMSGSIZE)
5732 return args.iter.err;
5733 if (args.iter.count == cb->args[0])
5736 cb->args[0] = args.iter.count;
5744 static int nf_tables_dump_set_start(struct netlink_callback *cb)
5746 struct nft_set_dump_ctx *dump_ctx = cb->data;
5748 cb->data = kmemdup(dump_ctx, sizeof(*dump_ctx), GFP_ATOMIC);
5750 return cb->data ? 0 : -ENOMEM;
5753 static int nf_tables_dump_set_done(struct netlink_callback *cb)
5759 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
5760 const struct nft_ctx *ctx, u32 seq,
5761 u32 portid, int event, u16 flags,
5762 const struct nft_set *set,
5763 const struct nft_set_elem *elem,
5766 struct nlmsghdr *nlh;
5767 struct nlattr *nest;
5770 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
5771 nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
5772 NFNETLINK_V0, nft_base_seq(ctx->net));
5774 goto nla_put_failure;
5776 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
5777 goto nla_put_failure;
5778 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
5779 goto nla_put_failure;
5781 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
5783 goto nla_put_failure;
5785 err = nf_tables_fill_setelem(skb, set, elem, reset);
5787 goto nla_put_failure;
5789 nla_nest_end(skb, nest);
5791 nlmsg_end(skb, nlh);
5795 nlmsg_trim(skb, nlh);
5799 static int nft_setelem_parse_flags(const struct nft_set *set,
5800 const struct nlattr *attr, u32 *flags)
5805 *flags = ntohl(nla_get_be32(attr));
5806 if (*flags & ~(NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL))
5808 if (!(set->flags & NFT_SET_INTERVAL) &&
5809 *flags & NFT_SET_ELEM_INTERVAL_END)
5811 if ((*flags & (NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL)) ==
5812 (NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL))
5818 static int nft_setelem_parse_key(struct nft_ctx *ctx, struct nft_set *set,
5819 struct nft_data *key, struct nlattr *attr)
5821 struct nft_data_desc desc = {
5822 .type = NFT_DATA_VALUE,
5823 .size = NFT_DATA_VALUE_MAXLEN,
5827 return nft_data_init(ctx, key, &desc, attr);
5830 static int nft_setelem_parse_data(struct nft_ctx *ctx, struct nft_set *set,
5831 struct nft_data_desc *desc,
5832 struct nft_data *data,
5833 struct nlattr *attr)
5837 if (set->dtype == NFT_DATA_VERDICT)
5838 dtype = NFT_DATA_VERDICT;
5840 dtype = NFT_DATA_VALUE;
5843 desc->size = NFT_DATA_VALUE_MAXLEN;
5844 desc->len = set->dlen;
5845 desc->flags = NFT_DATA_DESC_SETELEM;
5847 return nft_data_init(ctx, data, desc, attr);
5850 static void *nft_setelem_catchall_get(const struct net *net,
5851 const struct nft_set *set)
5853 struct nft_set_elem_catchall *catchall;
5854 u8 genmask = nft_genmask_cur(net);
5855 struct nft_set_ext *ext;
5858 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5859 ext = nft_set_elem_ext(set, catchall->elem);
5860 if (!nft_set_elem_active(ext, genmask) ||
5861 nft_set_elem_expired(ext))
5864 priv = catchall->elem;
5871 static int nft_setelem_get(struct nft_ctx *ctx, struct nft_set *set,
5872 struct nft_set_elem *elem, u32 flags)
5876 if (!(flags & NFT_SET_ELEM_CATCHALL)) {
5877 priv = set->ops->get(ctx->net, set, elem, flags);
5879 return PTR_ERR(priv);
5881 priv = nft_setelem_catchall_get(ctx->net, set);
5890 static int nft_get_set_elem(struct nft_ctx *ctx, struct nft_set *set,
5891 const struct nlattr *attr, bool reset)
5893 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
5894 struct nft_set_elem elem;
5895 struct sk_buff *skb;
5899 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
5900 nft_set_elem_policy, NULL);
5904 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
5908 if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
5911 if (nla[NFTA_SET_ELEM_KEY]) {
5912 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
5913 nla[NFTA_SET_ELEM_KEY]);
5918 if (nla[NFTA_SET_ELEM_KEY_END]) {
5919 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
5920 nla[NFTA_SET_ELEM_KEY_END]);
5925 err = nft_setelem_get(ctx, set, &elem, flags);
5930 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
5934 err = nf_tables_fill_setelem_info(skb, ctx, ctx->seq, ctx->portid,
5935 NFT_MSG_NEWSETELEM, 0, set, &elem,
5938 goto err_fill_setelem;
5940 return nfnetlink_unicast(skb, ctx->net, ctx->portid);
5947 /* called with rcu_read_lock held */
5948 static int nf_tables_getsetelem(struct sk_buff *skb,
5949 const struct nfnl_info *info,
5950 const struct nlattr * const nla[])
5952 struct netlink_ext_ack *extack = info->extack;
5953 u8 genmask = nft_genmask_cur(info->net);
5954 u8 family = info->nfmsg->nfgen_family;
5955 struct net *net = info->net;
5956 struct nft_table *table;
5957 struct nft_set *set;
5958 struct nlattr *attr;
5963 table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
5965 if (IS_ERR(table)) {
5966 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
5967 return PTR_ERR(table);
5970 set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
5972 return PTR_ERR(set);
5974 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
5976 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
5977 struct netlink_dump_control c = {
5978 .start = nf_tables_dump_set_start,
5979 .dump = nf_tables_dump_set,
5980 .done = nf_tables_dump_set_done,
5981 .module = THIS_MODULE,
5983 struct nft_set_dump_ctx dump_ctx = {
5989 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
5992 if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
5995 if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_GETSETELEM_RESET)
5998 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
5999 err = nft_get_set_elem(&ctx, set, attr, reset);
6001 NL_SET_BAD_ATTR(extack, attr);
6009 static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
6010 const struct nft_set *set,
6011 const struct nft_set_elem *elem,
6014 struct nftables_pernet *nft_net;
6015 struct net *net = ctx->net;
6016 u32 portid = ctx->portid;
6017 struct sk_buff *skb;
6021 if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
6024 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
6028 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
6029 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
6031 err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
6038 nft_net = nft_pernet(net);
6039 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
6042 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
6045 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
6047 struct nft_set *set)
6049 struct nft_trans *trans;
6051 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
6055 nft_trans_elem_set(trans) = set;
6059 struct nft_expr *nft_set_elem_expr_alloc(const struct nft_ctx *ctx,
6060 const struct nft_set *set,
6061 const struct nlattr *attr)
6063 struct nft_expr *expr;
6066 expr = nft_expr_init(ctx, attr);
6071 if (expr->ops->type->flags & NFT_EXPR_GC) {
6072 if (set->flags & NFT_SET_TIMEOUT)
6073 goto err_set_elem_expr;
6074 if (!set->ops->gc_init)
6075 goto err_set_elem_expr;
6076 set->ops->gc_init(set);
6082 nft_expr_destroy(ctx, expr);
6083 return ERR_PTR(err);
6086 static int nft_set_ext_check(const struct nft_set_ext_tmpl *tmpl, u8 id, u32 len)
6088 len += nft_set_ext_types[id].len;
6089 if (len > tmpl->ext_len[id] ||
6096 static int nft_set_ext_memcpy(const struct nft_set_ext_tmpl *tmpl, u8 id,
6097 void *to, const void *from, u32 len)
6099 if (nft_set_ext_check(tmpl, id, len) < 0)
6102 memcpy(to, from, len);
6107 void *nft_set_elem_init(const struct nft_set *set,
6108 const struct nft_set_ext_tmpl *tmpl,
6109 const u32 *key, const u32 *key_end,
6110 const u32 *data, u64 timeout, u64 expiration, gfp_t gfp)
6112 struct nft_set_ext *ext;
6115 elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
6117 return ERR_PTR(-ENOMEM);
6119 ext = nft_set_elem_ext(set, elem);
6120 nft_set_ext_init(ext, tmpl);
6122 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) &&
6123 nft_set_ext_memcpy(tmpl, NFT_SET_EXT_KEY,
6124 nft_set_ext_key(ext), key, set->klen) < 0)
6127 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
6128 nft_set_ext_memcpy(tmpl, NFT_SET_EXT_KEY_END,
6129 nft_set_ext_key_end(ext), key_end, set->klen) < 0)
6132 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
6133 nft_set_ext_memcpy(tmpl, NFT_SET_EXT_DATA,
6134 nft_set_ext_data(ext), data, set->dlen) < 0)
6137 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
6138 *nft_set_ext_expiration(ext) = get_jiffies_64() + expiration;
6139 if (expiration == 0)
6140 *nft_set_ext_expiration(ext) += timeout;
6142 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
6143 *nft_set_ext_timeout(ext) = timeout;
6150 return ERR_PTR(-EINVAL);
6153 static void __nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
6154 struct nft_expr *expr)
6156 if (expr->ops->destroy_clone) {
6157 expr->ops->destroy_clone(ctx, expr);
6158 module_put(expr->ops->type->owner);
6160 nf_tables_expr_destroy(ctx, expr);
6164 static void nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
6165 struct nft_set_elem_expr *elem_expr)
6167 struct nft_expr *expr;
6170 nft_setelem_expr_foreach(expr, elem_expr, size)
6171 __nft_set_elem_expr_destroy(ctx, expr);
6174 /* Drop references and destroy. Called from gc, dynset and abort path. */
6175 void nft_set_elem_destroy(const struct nft_set *set, void *elem,
6178 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
6179 struct nft_ctx ctx = {
6180 .net = read_pnet(&set->net),
6181 .family = set->table->family,
6184 nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE);
6185 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6186 nft_data_release(nft_set_ext_data(ext), set->dtype);
6187 if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
6188 nft_set_elem_expr_destroy(&ctx, nft_set_ext_expr(ext));
6190 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6191 nft_use_dec(&(*nft_set_ext_obj(ext))->use);
6194 EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
6196 /* Destroy element. References have been already dropped in the preparation
6197 * path via nft_setelem_data_deactivate().
6199 void nf_tables_set_elem_destroy(const struct nft_ctx *ctx,
6200 const struct nft_set *set, void *elem)
6202 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
6204 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
6205 nft_set_elem_expr_destroy(ctx, nft_set_ext_expr(ext));
6210 int nft_set_elem_expr_clone(const struct nft_ctx *ctx, struct nft_set *set,
6211 struct nft_expr *expr_array[])
6213 struct nft_expr *expr;
6216 for (i = 0; i < set->num_exprs; i++) {
6217 expr = kzalloc(set->exprs[i]->ops->size, GFP_KERNEL_ACCOUNT);
6221 err = nft_expr_clone(expr, set->exprs[i]);
6226 expr_array[i] = expr;
6232 for (k = i - 1; k >= 0; k--)
6233 nft_expr_destroy(ctx, expr_array[k]);
6238 static int nft_set_elem_expr_setup(struct nft_ctx *ctx,
6239 const struct nft_set_ext_tmpl *tmpl,
6240 const struct nft_set_ext *ext,
6241 struct nft_expr *expr_array[],
6244 struct nft_set_elem_expr *elem_expr = nft_set_ext_expr(ext);
6245 u32 len = sizeof(struct nft_set_elem_expr);
6246 struct nft_expr *expr;
6252 for (i = 0; i < num_exprs; i++)
6253 len += expr_array[i]->ops->size;
6255 if (nft_set_ext_check(tmpl, NFT_SET_EXT_EXPRESSIONS, len) < 0)
6258 for (i = 0; i < num_exprs; i++) {
6259 expr = nft_setelem_expr_at(elem_expr, elem_expr->size);
6260 err = nft_expr_clone(expr, expr_array[i]);
6262 goto err_elem_expr_setup;
6264 elem_expr->size += expr_array[i]->ops->size;
6265 nft_expr_destroy(ctx, expr_array[i]);
6266 expr_array[i] = NULL;
6271 err_elem_expr_setup:
6272 for (; i < num_exprs; i++) {
6273 nft_expr_destroy(ctx, expr_array[i]);
6274 expr_array[i] = NULL;
6280 struct nft_set_ext *nft_set_catchall_lookup(const struct net *net,
6281 const struct nft_set *set)
6283 struct nft_set_elem_catchall *catchall;
6284 u8 genmask = nft_genmask_cur(net);
6285 struct nft_set_ext *ext;
6287 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
6288 ext = nft_set_elem_ext(set, catchall->elem);
6289 if (nft_set_elem_active(ext, genmask) &&
6290 !nft_set_elem_expired(ext) &&
6291 !nft_set_elem_is_dead(ext))
6297 EXPORT_SYMBOL_GPL(nft_set_catchall_lookup);
6299 static int nft_setelem_catchall_insert(const struct net *net,
6300 struct nft_set *set,
6301 const struct nft_set_elem *elem,
6302 struct nft_set_ext **pext)
6304 struct nft_set_elem_catchall *catchall;
6305 u8 genmask = nft_genmask_next(net);
6306 struct nft_set_ext *ext;
6308 list_for_each_entry(catchall, &set->catchall_list, list) {
6309 ext = nft_set_elem_ext(set, catchall->elem);
6310 if (nft_set_elem_active(ext, genmask)) {
6316 catchall = kmalloc(sizeof(*catchall), GFP_KERNEL);
6320 catchall->elem = elem->priv;
6321 list_add_tail_rcu(&catchall->list, &set->catchall_list);
6326 static int nft_setelem_insert(const struct net *net,
6327 struct nft_set *set,
6328 const struct nft_set_elem *elem,
6329 struct nft_set_ext **ext, unsigned int flags)
6333 if (flags & NFT_SET_ELEM_CATCHALL)
6334 ret = nft_setelem_catchall_insert(net, set, elem, ext);
6336 ret = set->ops->insert(net, set, elem, ext);
6341 static bool nft_setelem_is_catchall(const struct nft_set *set,
6342 const struct nft_set_elem *elem)
6344 struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6346 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
6347 *nft_set_ext_flags(ext) & NFT_SET_ELEM_CATCHALL)
6353 static void nft_setelem_activate(struct net *net, struct nft_set *set,
6354 struct nft_set_elem *elem)
6356 struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6358 if (nft_setelem_is_catchall(set, elem)) {
6359 nft_set_elem_change_active(net, set, ext);
6361 set->ops->activate(net, set, elem);
6365 static int nft_setelem_catchall_deactivate(const struct net *net,
6366 struct nft_set *set,
6367 struct nft_set_elem *elem)
6369 struct nft_set_elem_catchall *catchall;
6370 struct nft_set_ext *ext;
6372 list_for_each_entry(catchall, &set->catchall_list, list) {
6373 ext = nft_set_elem_ext(set, catchall->elem);
6374 if (!nft_is_active(net, ext))
6378 elem->priv = catchall->elem;
6379 nft_set_elem_change_active(net, set, ext);
6386 static int __nft_setelem_deactivate(const struct net *net,
6387 struct nft_set *set,
6388 struct nft_set_elem *elem)
6392 priv = set->ops->deactivate(net, set, elem);
6403 static int nft_setelem_deactivate(const struct net *net,
6404 struct nft_set *set,
6405 struct nft_set_elem *elem, u32 flags)
6409 if (flags & NFT_SET_ELEM_CATCHALL)
6410 ret = nft_setelem_catchall_deactivate(net, set, elem);
6412 ret = __nft_setelem_deactivate(net, set, elem);
6417 static void nft_setelem_catchall_remove(const struct net *net,
6418 const struct nft_set *set,
6419 const struct nft_set_elem *elem)
6421 struct nft_set_elem_catchall *catchall, *next;
6423 list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
6424 if (catchall->elem == elem->priv) {
6425 list_del_rcu(&catchall->list);
6426 kfree_rcu(catchall, rcu);
6432 static void nft_setelem_remove(const struct net *net,
6433 const struct nft_set *set,
6434 const struct nft_set_elem *elem)
6436 if (nft_setelem_is_catchall(set, elem))
6437 nft_setelem_catchall_remove(net, set, elem);
6439 set->ops->remove(net, set, elem);
6442 static bool nft_setelem_valid_key_end(const struct nft_set *set,
6443 struct nlattr **nla, u32 flags)
6445 if ((set->flags & (NFT_SET_CONCAT | NFT_SET_INTERVAL)) ==
6446 (NFT_SET_CONCAT | NFT_SET_INTERVAL)) {
6447 if (flags & NFT_SET_ELEM_INTERVAL_END)
6450 if (nla[NFTA_SET_ELEM_KEY_END] &&
6451 flags & NFT_SET_ELEM_CATCHALL)
6454 if (nla[NFTA_SET_ELEM_KEY_END])
6461 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
6462 const struct nlattr *attr, u32 nlmsg_flags)
6464 struct nft_expr *expr_array[NFT_SET_EXPR_MAX] = {};
6465 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
6466 u8 genmask = nft_genmask_next(ctx->net);
6467 u32 flags = 0, size = 0, num_exprs = 0;
6468 struct nft_set_ext_tmpl tmpl;
6469 struct nft_set_ext *ext, *ext2;
6470 struct nft_set_elem elem;
6471 struct nft_set_binding *binding;
6472 struct nft_object *obj = NULL;
6473 struct nft_userdata *udata;
6474 struct nft_data_desc desc;
6475 enum nft_registers dreg;
6476 struct nft_trans *trans;
6482 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
6483 nft_set_elem_policy, NULL);
6487 nft_set_ext_prepare(&tmpl);
6489 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
6493 if (((flags & NFT_SET_ELEM_CATCHALL) && nla[NFTA_SET_ELEM_KEY]) ||
6494 (!(flags & NFT_SET_ELEM_CATCHALL) && !nla[NFTA_SET_ELEM_KEY]))
6498 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
6503 if (set->flags & NFT_SET_MAP) {
6504 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
6505 !(flags & NFT_SET_ELEM_INTERVAL_END))
6508 if (nla[NFTA_SET_ELEM_DATA] != NULL)
6512 if (set->flags & NFT_SET_OBJECT) {
6513 if (!nla[NFTA_SET_ELEM_OBJREF] &&
6514 !(flags & NFT_SET_ELEM_INTERVAL_END))
6517 if (nla[NFTA_SET_ELEM_OBJREF])
6521 if (!nft_setelem_valid_key_end(set, nla, flags))
6524 if ((flags & NFT_SET_ELEM_INTERVAL_END) &&
6525 (nla[NFTA_SET_ELEM_DATA] ||
6526 nla[NFTA_SET_ELEM_OBJREF] ||
6527 nla[NFTA_SET_ELEM_TIMEOUT] ||
6528 nla[NFTA_SET_ELEM_EXPIRATION] ||
6529 nla[NFTA_SET_ELEM_USERDATA] ||
6530 nla[NFTA_SET_ELEM_EXPR] ||
6531 nla[NFTA_SET_ELEM_KEY_END] ||
6532 nla[NFTA_SET_ELEM_EXPRESSIONS]))
6536 if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
6537 if (!(set->flags & NFT_SET_TIMEOUT))
6539 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_TIMEOUT],
6543 } else if (set->flags & NFT_SET_TIMEOUT &&
6544 !(flags & NFT_SET_ELEM_INTERVAL_END)) {
6545 timeout = READ_ONCE(set->timeout);
6549 if (nla[NFTA_SET_ELEM_EXPIRATION] != NULL) {
6550 if (!(set->flags & NFT_SET_TIMEOUT))
6552 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_EXPIRATION],
6558 if (nla[NFTA_SET_ELEM_EXPR]) {
6559 struct nft_expr *expr;
6561 if (set->num_exprs && set->num_exprs != 1)
6564 expr = nft_set_elem_expr_alloc(ctx, set,
6565 nla[NFTA_SET_ELEM_EXPR]);
6567 return PTR_ERR(expr);
6569 expr_array[0] = expr;
6572 if (set->num_exprs && set->exprs[0]->ops != expr->ops) {
6574 goto err_set_elem_expr;
6576 } else if (nla[NFTA_SET_ELEM_EXPRESSIONS]) {
6577 struct nft_expr *expr;
6582 nla_for_each_nested(tmp, nla[NFTA_SET_ELEM_EXPRESSIONS], left) {
6583 if (i == NFT_SET_EXPR_MAX ||
6584 (set->num_exprs && set->num_exprs == i)) {
6586 goto err_set_elem_expr;
6588 if (nla_type(tmp) != NFTA_LIST_ELEM) {
6590 goto err_set_elem_expr;
6592 expr = nft_set_elem_expr_alloc(ctx, set, tmp);
6594 err = PTR_ERR(expr);
6595 goto err_set_elem_expr;
6597 expr_array[i] = expr;
6600 if (set->num_exprs && expr->ops != set->exprs[i]->ops) {
6602 goto err_set_elem_expr;
6606 if (set->num_exprs && set->num_exprs != i) {
6608 goto err_set_elem_expr;
6610 } else if (set->num_exprs > 0 &&
6611 !(flags & NFT_SET_ELEM_INTERVAL_END)) {
6612 err = nft_set_elem_expr_clone(ctx, set, expr_array);
6614 goto err_set_elem_expr_clone;
6616 num_exprs = set->num_exprs;
6619 if (nla[NFTA_SET_ELEM_KEY]) {
6620 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
6621 nla[NFTA_SET_ELEM_KEY]);
6623 goto err_set_elem_expr;
6625 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
6630 if (nla[NFTA_SET_ELEM_KEY_END]) {
6631 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
6632 nla[NFTA_SET_ELEM_KEY_END]);
6636 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
6638 goto err_parse_key_end;
6642 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
6644 goto err_parse_key_end;
6646 if (timeout != READ_ONCE(set->timeout)) {
6647 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
6649 goto err_parse_key_end;
6654 for (i = 0; i < num_exprs; i++)
6655 size += expr_array[i]->ops->size;
6657 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_EXPRESSIONS,
6658 sizeof(struct nft_set_elem_expr) + size);
6660 goto err_parse_key_end;
6663 if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
6664 obj = nft_obj_lookup(ctx->net, ctx->table,
6665 nla[NFTA_SET_ELEM_OBJREF],
6666 set->objtype, genmask);
6670 goto err_parse_key_end;
6673 if (!nft_use_inc(&obj->use)) {
6676 goto err_parse_key_end;
6679 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
6681 goto err_parse_key_end;
6684 if (nla[NFTA_SET_ELEM_DATA] != NULL) {
6685 err = nft_setelem_parse_data(ctx, set, &desc, &elem.data.val,
6686 nla[NFTA_SET_ELEM_DATA]);
6688 goto err_parse_key_end;
6690 dreg = nft_type_to_reg(set->dtype);
6691 list_for_each_entry(binding, &set->bindings, list) {
6692 struct nft_ctx bind_ctx = {
6694 .family = ctx->family,
6695 .table = ctx->table,
6696 .chain = (struct nft_chain *)binding->chain,
6699 if (!(binding->flags & NFT_SET_MAP))
6702 err = nft_validate_register_store(&bind_ctx, dreg,
6704 desc.type, desc.len);
6706 goto err_parse_data;
6708 if (desc.type == NFT_DATA_VERDICT &&
6709 (elem.data.val.verdict.code == NFT_GOTO ||
6710 elem.data.val.verdict.code == NFT_JUMP))
6711 nft_validate_state_update(ctx->table,
6715 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, desc.len);
6717 goto err_parse_data;
6720 /* The full maximum length of userdata can exceed the maximum
6721 * offset value (U8_MAX) for following extensions, therefor it
6722 * must be the last extension added.
6725 if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
6726 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
6728 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
6731 goto err_parse_data;
6735 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
6736 elem.key_end.val.data, elem.data.val.data,
6737 timeout, expiration, GFP_KERNEL_ACCOUNT);
6738 if (IS_ERR(elem.priv)) {
6739 err = PTR_ERR(elem.priv);
6740 goto err_parse_data;
6743 ext = nft_set_elem_ext(set, elem.priv);
6745 *nft_set_ext_flags(ext) = flags;
6748 *nft_set_ext_obj(ext) = obj;
6751 if (nft_set_ext_check(&tmpl, NFT_SET_EXT_USERDATA, ulen) < 0) {
6755 udata = nft_set_ext_userdata(ext);
6756 udata->len = ulen - 1;
6757 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
6759 err = nft_set_elem_expr_setup(ctx, &tmpl, ext, expr_array, num_exprs);
6763 trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
6764 if (trans == NULL) {
6769 ext->genmask = nft_genmask_cur(ctx->net);
6771 err = nft_setelem_insert(ctx->net, set, &elem, &ext2, flags);
6773 if (err == -EEXIST) {
6774 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^
6775 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) ||
6776 nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^
6777 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF))
6778 goto err_element_clash;
6779 if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
6780 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
6781 memcmp(nft_set_ext_data(ext),
6782 nft_set_ext_data(ext2), set->dlen) != 0) ||
6783 (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
6784 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
6785 *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
6786 goto err_element_clash;
6787 else if (!(nlmsg_flags & NLM_F_EXCL))
6789 } else if (err == -ENOTEMPTY) {
6790 /* ENOTEMPTY reports overlapping between this element
6791 * and an existing one.
6795 goto err_element_clash;
6798 if (!(flags & NFT_SET_ELEM_CATCHALL)) {
6799 unsigned int max = set->size ? set->size + set->ndeact : UINT_MAX;
6801 if (!atomic_add_unless(&set->nelems, 1, max)) {
6807 nft_trans_elem(trans) = elem;
6808 nft_trans_commit_list_add_tail(ctx->net, trans);
6812 nft_setelem_remove(ctx->net, set, &elem);
6816 nf_tables_set_elem_destroy(ctx, set, elem.priv);
6818 if (nla[NFTA_SET_ELEM_DATA] != NULL)
6819 nft_data_release(&elem.data.val, desc.type);
6822 nft_use_dec_restore(&obj->use);
6824 nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
6826 nft_data_release(&elem.key.val, NFT_DATA_VALUE);
6828 for (i = 0; i < num_exprs && expr_array[i]; i++)
6829 nft_expr_destroy(ctx, expr_array[i]);
6830 err_set_elem_expr_clone:
6834 static int nf_tables_newsetelem(struct sk_buff *skb,
6835 const struct nfnl_info *info,
6836 const struct nlattr * const nla[])
6838 struct netlink_ext_ack *extack = info->extack;
6839 u8 genmask = nft_genmask_next(info->net);
6840 u8 family = info->nfmsg->nfgen_family;
6841 struct net *net = info->net;
6842 const struct nlattr *attr;
6843 struct nft_table *table;
6844 struct nft_set *set;
6848 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
6851 table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
6852 genmask, NETLINK_CB(skb).portid);
6853 if (IS_ERR(table)) {
6854 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
6855 return PTR_ERR(table);
6858 set = nft_set_lookup_global(net, table, nla[NFTA_SET_ELEM_LIST_SET],
6859 nla[NFTA_SET_ELEM_LIST_SET_ID], genmask);
6861 return PTR_ERR(set);
6863 if (!list_empty(&set->bindings) &&
6864 (set->flags & (NFT_SET_CONSTANT | NFT_SET_ANONYMOUS)))
6867 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6869 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
6870 err = nft_add_set_elem(&ctx, set, attr, info->nlh->nlmsg_flags);
6872 NL_SET_BAD_ATTR(extack, attr);
6877 if (table->validate_state == NFT_VALIDATE_DO)
6878 return nft_table_validate(net, table);
6884 * nft_data_hold - hold a nft_data item
6886 * @data: struct nft_data to release
6887 * @type: type of data
6889 * Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded,
6890 * NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and
6891 * NFT_GOTO verdicts. This function must be called on active data objects
6892 * from the second phase of the commit protocol.
6894 void nft_data_hold(const struct nft_data *data, enum nft_data_types type)
6896 struct nft_chain *chain;
6898 if (type == NFT_DATA_VERDICT) {
6899 switch (data->verdict.code) {
6902 chain = data->verdict.chain;
6903 nft_use_inc_restore(&chain->use);
6909 static void nft_setelem_data_activate(const struct net *net,
6910 const struct nft_set *set,
6911 struct nft_set_elem *elem)
6913 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6915 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6916 nft_data_hold(nft_set_ext_data(ext), set->dtype);
6917 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6918 nft_use_inc_restore(&(*nft_set_ext_obj(ext))->use);
6921 void nft_setelem_data_deactivate(const struct net *net,
6922 const struct nft_set *set,
6923 struct nft_set_elem *elem)
6925 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6927 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6928 nft_data_release(nft_set_ext_data(ext), set->dtype);
6929 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6930 nft_use_dec(&(*nft_set_ext_obj(ext))->use);
6933 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
6934 const struct nlattr *attr)
6936 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
6937 struct nft_set_ext_tmpl tmpl;
6938 struct nft_set_elem elem;
6939 struct nft_set_ext *ext;
6940 struct nft_trans *trans;
6944 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
6945 nft_set_elem_policy, NULL);
6949 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
6953 if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
6956 if (!nft_setelem_valid_key_end(set, nla, flags))
6959 nft_set_ext_prepare(&tmpl);
6962 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
6967 if (nla[NFTA_SET_ELEM_KEY]) {
6968 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
6969 nla[NFTA_SET_ELEM_KEY]);
6973 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
6978 if (nla[NFTA_SET_ELEM_KEY_END]) {
6979 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
6980 nla[NFTA_SET_ELEM_KEY_END]);
6984 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
6986 goto fail_elem_key_end;
6990 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
6991 elem.key_end.val.data, NULL, 0, 0,
6992 GFP_KERNEL_ACCOUNT);
6993 if (IS_ERR(elem.priv)) {
6994 err = PTR_ERR(elem.priv);
6995 goto fail_elem_key_end;
6998 ext = nft_set_elem_ext(set, elem.priv);
7000 *nft_set_ext_flags(ext) = flags;
7002 trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
7006 err = nft_setelem_deactivate(ctx->net, set, &elem, flags);
7010 nft_setelem_data_deactivate(ctx->net, set, &elem);
7012 nft_trans_elem(trans) = elem;
7013 nft_trans_commit_list_add_tail(ctx->net, trans);
7021 nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
7023 nft_data_release(&elem.key.val, NFT_DATA_VALUE);
7027 static int nft_setelem_flush(const struct nft_ctx *ctx,
7028 struct nft_set *set,
7029 const struct nft_set_iter *iter,
7030 struct nft_set_elem *elem)
7032 struct nft_trans *trans;
7035 trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
7036 sizeof(struct nft_trans_elem), GFP_ATOMIC);
7040 if (!set->ops->flush(ctx->net, set, elem->priv)) {
7046 nft_setelem_data_deactivate(ctx->net, set, elem);
7047 nft_trans_elem_set(trans) = set;
7048 nft_trans_elem(trans) = *elem;
7049 nft_trans_commit_list_add_tail(ctx->net, trans);
7057 static int __nft_set_catchall_flush(const struct nft_ctx *ctx,
7058 struct nft_set *set,
7059 struct nft_set_elem *elem)
7061 struct nft_trans *trans;
7063 trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
7064 sizeof(struct nft_trans_elem), GFP_KERNEL);
7068 nft_setelem_data_deactivate(ctx->net, set, elem);
7069 nft_trans_elem_set(trans) = set;
7070 nft_trans_elem(trans) = *elem;
7071 nft_trans_commit_list_add_tail(ctx->net, trans);
7076 static int nft_set_catchall_flush(const struct nft_ctx *ctx,
7077 struct nft_set *set)
7079 u8 genmask = nft_genmask_next(ctx->net);
7080 struct nft_set_elem_catchall *catchall;
7081 struct nft_set_elem elem;
7082 struct nft_set_ext *ext;
7085 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
7086 ext = nft_set_elem_ext(set, catchall->elem);
7087 if (!nft_set_elem_active(ext, genmask))
7090 elem.priv = catchall->elem;
7091 ret = __nft_set_catchall_flush(ctx, set, &elem);
7094 nft_set_elem_change_active(ctx->net, set, ext);
7100 static int nft_set_flush(struct nft_ctx *ctx, struct nft_set *set, u8 genmask)
7102 struct nft_set_iter iter = {
7104 .fn = nft_setelem_flush,
7107 set->ops->walk(ctx, set, &iter);
7109 iter.err = nft_set_catchall_flush(ctx, set);
7114 static int nf_tables_delsetelem(struct sk_buff *skb,
7115 const struct nfnl_info *info,
7116 const struct nlattr * const nla[])
7118 struct netlink_ext_ack *extack = info->extack;
7119 u8 genmask = nft_genmask_next(info->net);
7120 u8 family = info->nfmsg->nfgen_family;
7121 struct net *net = info->net;
7122 const struct nlattr *attr;
7123 struct nft_table *table;
7124 struct nft_set *set;
7128 table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
7129 genmask, NETLINK_CB(skb).portid);
7130 if (IS_ERR(table)) {
7131 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
7132 return PTR_ERR(table);
7135 set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
7137 return PTR_ERR(set);
7139 if (!list_empty(&set->bindings) &&
7140 (set->flags & (NFT_SET_CONSTANT | NFT_SET_ANONYMOUS)))
7143 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7145 if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
7146 return nft_set_flush(&ctx, set, genmask);
7148 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
7149 err = nft_del_setelem(&ctx, set, attr);
7150 if (err == -ENOENT &&
7151 NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYSETELEM)
7155 NL_SET_BAD_ATTR(extack, attr);
7167 * nft_register_obj- register nf_tables stateful object type
7168 * @obj_type: object type
7170 * Registers the object type for use with nf_tables. Returns zero on
7171 * success or a negative errno code otherwise.
7173 int nft_register_obj(struct nft_object_type *obj_type)
7175 if (obj_type->type == NFT_OBJECT_UNSPEC)
7178 nfnl_lock(NFNL_SUBSYS_NFTABLES);
7179 list_add_rcu(&obj_type->list, &nf_tables_objects);
7180 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7183 EXPORT_SYMBOL_GPL(nft_register_obj);
7186 * nft_unregister_obj - unregister nf_tables object type
7187 * @obj_type: object type
7189 * Unregisters the object type for use with nf_tables.
7191 void nft_unregister_obj(struct nft_object_type *obj_type)
7193 nfnl_lock(NFNL_SUBSYS_NFTABLES);
7194 list_del_rcu(&obj_type->list);
7195 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7197 EXPORT_SYMBOL_GPL(nft_unregister_obj);
7199 struct nft_object *nft_obj_lookup(const struct net *net,
7200 const struct nft_table *table,
7201 const struct nlattr *nla, u32 objtype,
7204 struct nft_object_hash_key k = { .table = table };
7205 char search[NFT_OBJ_MAXNAMELEN];
7206 struct rhlist_head *tmp, *list;
7207 struct nft_object *obj;
7209 nla_strscpy(search, nla, sizeof(search));
7212 WARN_ON_ONCE(!rcu_read_lock_held() &&
7213 !lockdep_commit_lock_is_held(net));
7216 list = rhltable_lookup(&nft_objname_ht, &k, nft_objname_ht_params);
7220 rhl_for_each_entry_rcu(obj, tmp, list, rhlhead) {
7221 if (objtype == obj->ops->type->type &&
7222 nft_active_genmask(obj, genmask)) {
7229 return ERR_PTR(-ENOENT);
7231 EXPORT_SYMBOL_GPL(nft_obj_lookup);
7233 static struct nft_object *nft_obj_lookup_byhandle(const struct nft_table *table,
7234 const struct nlattr *nla,
7235 u32 objtype, u8 genmask)
7237 struct nft_object *obj;
7239 list_for_each_entry(obj, &table->objects, list) {
7240 if (be64_to_cpu(nla_get_be64(nla)) == obj->handle &&
7241 objtype == obj->ops->type->type &&
7242 nft_active_genmask(obj, genmask))
7245 return ERR_PTR(-ENOENT);
7248 static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
7249 [NFTA_OBJ_TABLE] = { .type = NLA_STRING,
7250 .len = NFT_TABLE_MAXNAMELEN - 1 },
7251 [NFTA_OBJ_NAME] = { .type = NLA_STRING,
7252 .len = NFT_OBJ_MAXNAMELEN - 1 },
7253 [NFTA_OBJ_TYPE] = { .type = NLA_U32 },
7254 [NFTA_OBJ_DATA] = { .type = NLA_NESTED },
7255 [NFTA_OBJ_HANDLE] = { .type = NLA_U64},
7256 [NFTA_OBJ_USERDATA] = { .type = NLA_BINARY,
7257 .len = NFT_USERDATA_MAXLEN },
7260 static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,
7261 const struct nft_object_type *type,
7262 const struct nlattr *attr)
7265 const struct nft_object_ops *ops;
7266 struct nft_object *obj;
7269 tb = kmalloc_array(type->maxattr + 1, sizeof(*tb), GFP_KERNEL);
7274 err = nla_parse_nested_deprecated(tb, type->maxattr, attr,
7275 type->policy, NULL);
7279 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
7282 if (type->select_ops) {
7283 ops = type->select_ops(ctx, (const struct nlattr * const *)tb);
7293 obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL_ACCOUNT);
7297 err = ops->init(ctx, (const struct nlattr * const *)tb, obj);
7310 return ERR_PTR(err);
7313 static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
7314 struct nft_object *obj, bool reset)
7316 struct nlattr *nest;
7318 nest = nla_nest_start_noflag(skb, attr);
7320 goto nla_put_failure;
7321 if (obj->ops->dump(skb, obj, reset) < 0)
7322 goto nla_put_failure;
7323 nla_nest_end(skb, nest);
7330 static const struct nft_object_type *__nft_obj_type_get(u32 objtype)
7332 const struct nft_object_type *type;
7334 list_for_each_entry(type, &nf_tables_objects, list) {
7335 if (objtype == type->type)
7341 static const struct nft_object_type *
7342 nft_obj_type_get(struct net *net, u32 objtype)
7344 const struct nft_object_type *type;
7346 type = __nft_obj_type_get(objtype);
7347 if (type != NULL && try_module_get(type->owner))
7350 lockdep_nfnl_nft_mutex_not_held();
7351 #ifdef CONFIG_MODULES
7353 if (nft_request_module(net, "nft-obj-%u", objtype) == -EAGAIN)
7354 return ERR_PTR(-EAGAIN);
7357 return ERR_PTR(-ENOENT);
7360 static int nf_tables_updobj(const struct nft_ctx *ctx,
7361 const struct nft_object_type *type,
7362 const struct nlattr *attr,
7363 struct nft_object *obj)
7365 struct nft_object *newobj;
7366 struct nft_trans *trans;
7369 if (!try_module_get(type->owner))
7372 trans = nft_trans_alloc(ctx, NFT_MSG_NEWOBJ,
7373 sizeof(struct nft_trans_obj));
7377 newobj = nft_obj_init(ctx, type, attr);
7378 if (IS_ERR(newobj)) {
7379 err = PTR_ERR(newobj);
7380 goto err_free_trans;
7383 nft_trans_obj(trans) = obj;
7384 nft_trans_obj_update(trans) = true;
7385 nft_trans_obj_newobj(trans) = newobj;
7386 nft_trans_commit_list_add_tail(ctx->net, trans);
7393 module_put(type->owner);
7397 static int nf_tables_newobj(struct sk_buff *skb, const struct nfnl_info *info,
7398 const struct nlattr * const nla[])
7400 struct netlink_ext_ack *extack = info->extack;
7401 u8 genmask = nft_genmask_next(info->net);
7402 u8 family = info->nfmsg->nfgen_family;
7403 const struct nft_object_type *type;
7404 struct net *net = info->net;
7405 struct nft_table *table;
7406 struct nft_object *obj;
7411 if (!nla[NFTA_OBJ_TYPE] ||
7412 !nla[NFTA_OBJ_NAME] ||
7413 !nla[NFTA_OBJ_DATA])
7416 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
7417 NETLINK_CB(skb).portid);
7418 if (IS_ERR(table)) {
7419 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7420 return PTR_ERR(table);
7423 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7424 obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
7427 if (err != -ENOENT) {
7428 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7432 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
7433 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7436 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
7439 type = __nft_obj_type_get(objtype);
7440 if (WARN_ON_ONCE(!type))
7443 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7445 return nf_tables_updobj(&ctx, type, nla[NFTA_OBJ_DATA], obj);
7448 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7450 if (!nft_use_inc(&table->use))
7453 type = nft_obj_type_get(net, objtype);
7455 err = PTR_ERR(type);
7459 obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]);
7464 obj->key.table = table;
7465 obj->handle = nf_tables_alloc_handle(table);
7467 obj->key.name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL_ACCOUNT);
7468 if (!obj->key.name) {
7473 if (nla[NFTA_OBJ_USERDATA]) {
7474 obj->udata = nla_memdup(nla[NFTA_OBJ_USERDATA], GFP_KERNEL_ACCOUNT);
7475 if (obj->udata == NULL)
7478 obj->udlen = nla_len(nla[NFTA_OBJ_USERDATA]);
7481 err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
7485 err = rhltable_insert(&nft_objname_ht, &obj->rhlhead,
7486 nft_objname_ht_params);
7490 list_add_tail_rcu(&obj->list, &table->objects);
7494 /* queued in transaction log */
7495 INIT_LIST_HEAD(&obj->list);
7500 kfree(obj->key.name);
7502 if (obj->ops->destroy)
7503 obj->ops->destroy(&ctx, obj);
7506 module_put(type->owner);
7508 nft_use_dec_restore(&table->use);
7513 static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
7514 u32 portid, u32 seq, int event, u32 flags,
7515 int family, const struct nft_table *table,
7516 struct nft_object *obj, bool reset)
7518 struct nlmsghdr *nlh;
7520 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
7521 nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
7522 NFNETLINK_V0, nft_base_seq(net));
7524 goto nla_put_failure;
7526 if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
7527 nla_put_string(skb, NFTA_OBJ_NAME, obj->key.name) ||
7528 nla_put_be64(skb, NFTA_OBJ_HANDLE, cpu_to_be64(obj->handle),
7530 goto nla_put_failure;
7532 if (event == NFT_MSG_DELOBJ) {
7533 nlmsg_end(skb, nlh);
7537 if (nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) ||
7538 nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
7539 nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset))
7540 goto nla_put_failure;
7543 nla_put(skb, NFTA_OBJ_USERDATA, obj->udlen, obj->udata))
7544 goto nla_put_failure;
7546 nlmsg_end(skb, nlh);
7550 nlmsg_trim(skb, nlh);
7554 struct nft_obj_filter {
7559 static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
7561 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
7562 const struct nft_table *table;
7563 unsigned int idx = 0, s_idx = cb->args[0];
7564 struct nft_obj_filter *filter = cb->data;
7565 struct net *net = sock_net(skb->sk);
7566 int family = nfmsg->nfgen_family;
7567 struct nftables_pernet *nft_net;
7568 struct nft_object *obj;
7571 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
7575 nft_net = nft_pernet(net);
7576 cb->seq = READ_ONCE(nft_net->base_seq);
7578 list_for_each_entry_rcu(table, &nft_net->tables, list) {
7579 if (family != NFPROTO_UNSPEC && family != table->family)
7582 list_for_each_entry_rcu(obj, &table->objects, list) {
7583 if (!nft_is_active(net, obj))
7588 memset(&cb->args[1], 0,
7589 sizeof(cb->args) - sizeof(cb->args[0]));
7590 if (filter && filter->table &&
7591 strcmp(filter->table, table->name))
7594 filter->type != NFT_OBJECT_UNSPEC &&
7595 obj->ops->type->type != filter->type)
7598 char *buf = kasprintf(GFP_ATOMIC,
7603 audit_log_nfcfg(buf,
7606 AUDIT_NFT_OP_OBJ_RESET,
7611 if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid,
7614 NLM_F_MULTI | NLM_F_APPEND,
7615 table->family, table,
7619 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7631 static int nf_tables_dump_obj_start(struct netlink_callback *cb)
7633 const struct nlattr * const *nla = cb->data;
7634 struct nft_obj_filter *filter = NULL;
7636 if (nla[NFTA_OBJ_TABLE] || nla[NFTA_OBJ_TYPE]) {
7637 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
7641 if (nla[NFTA_OBJ_TABLE]) {
7642 filter->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_ATOMIC);
7643 if (!filter->table) {
7649 if (nla[NFTA_OBJ_TYPE])
7650 filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7657 static int nf_tables_dump_obj_done(struct netlink_callback *cb)
7659 struct nft_obj_filter *filter = cb->data;
7662 kfree(filter->table);
7669 /* called with rcu_read_lock held */
7670 static int nf_tables_getobj(struct sk_buff *skb, const struct nfnl_info *info,
7671 const struct nlattr * const nla[])
7673 struct netlink_ext_ack *extack = info->extack;
7674 u8 genmask = nft_genmask_cur(info->net);
7675 u8 family = info->nfmsg->nfgen_family;
7676 const struct nft_table *table;
7677 struct net *net = info->net;
7678 struct nft_object *obj;
7679 struct sk_buff *skb2;
7684 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
7685 struct netlink_dump_control c = {
7686 .start = nf_tables_dump_obj_start,
7687 .dump = nf_tables_dump_obj,
7688 .done = nf_tables_dump_obj_done,
7689 .module = THIS_MODULE,
7690 .data = (void *)nla,
7693 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
7696 if (!nla[NFTA_OBJ_NAME] ||
7697 !nla[NFTA_OBJ_TYPE])
7700 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask, 0);
7701 if (IS_ERR(table)) {
7702 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7703 return PTR_ERR(table);
7706 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7707 obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
7709 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7710 return PTR_ERR(obj);
7713 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
7717 if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
7721 const struct nftables_pernet *nft_net;
7724 nft_net = nft_pernet(net);
7725 buf = kasprintf(GFP_ATOMIC, "%s:%u", table->name, nft_net->base_seq);
7727 audit_log_nfcfg(buf,
7730 AUDIT_NFT_OP_OBJ_RESET,
7735 err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
7736 info->nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
7737 family, table, obj, reset);
7739 goto err_fill_obj_info;
7741 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
7748 static void nft_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj)
7750 if (obj->ops->destroy)
7751 obj->ops->destroy(ctx, obj);
7753 module_put(obj->ops->type->owner);
7754 kfree(obj->key.name);
7759 static int nf_tables_delobj(struct sk_buff *skb, const struct nfnl_info *info,
7760 const struct nlattr * const nla[])
7762 struct netlink_ext_ack *extack = info->extack;
7763 u8 genmask = nft_genmask_next(info->net);
7764 u8 family = info->nfmsg->nfgen_family;
7765 struct net *net = info->net;
7766 const struct nlattr *attr;
7767 struct nft_table *table;
7768 struct nft_object *obj;
7772 if (!nla[NFTA_OBJ_TYPE] ||
7773 (!nla[NFTA_OBJ_NAME] && !nla[NFTA_OBJ_HANDLE]))
7776 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
7777 NETLINK_CB(skb).portid);
7778 if (IS_ERR(table)) {
7779 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7780 return PTR_ERR(table);
7783 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7784 if (nla[NFTA_OBJ_HANDLE]) {
7785 attr = nla[NFTA_OBJ_HANDLE];
7786 obj = nft_obj_lookup_byhandle(table, attr, objtype, genmask);
7788 attr = nla[NFTA_OBJ_NAME];
7789 obj = nft_obj_lookup(net, table, attr, objtype, genmask);
7793 if (PTR_ERR(obj) == -ENOENT &&
7794 NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYOBJ)
7797 NL_SET_BAD_ATTR(extack, attr);
7798 return PTR_ERR(obj);
7801 NL_SET_BAD_ATTR(extack, attr);
7805 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7807 return nft_delobj(&ctx, obj);
7810 void nft_obj_notify(struct net *net, const struct nft_table *table,
7811 struct nft_object *obj, u32 portid, u32 seq, int event,
7812 u16 flags, int family, int report, gfp_t gfp)
7814 struct nftables_pernet *nft_net = nft_pernet(net);
7815 struct sk_buff *skb;
7817 char *buf = kasprintf(gfp, "%s:%u",
7818 table->name, nft_net->base_seq);
7820 audit_log_nfcfg(buf,
7823 event == NFT_MSG_NEWOBJ ?
7824 AUDIT_NFT_OP_OBJ_REGISTER :
7825 AUDIT_NFT_OP_OBJ_UNREGISTER,
7830 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
7833 skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
7837 err = nf_tables_fill_obj_info(skb, net, portid, seq, event,
7838 flags & (NLM_F_CREATE | NLM_F_EXCL),
7839 family, table, obj, false);
7845 nft_notify_enqueue(skb, report, &nft_net->notify_list);
7848 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
7850 EXPORT_SYMBOL_GPL(nft_obj_notify);
7852 static void nf_tables_obj_notify(const struct nft_ctx *ctx,
7853 struct nft_object *obj, int event)
7855 nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid, ctx->seq, event,
7856 ctx->flags, ctx->family, ctx->report, GFP_KERNEL);
7862 void nft_register_flowtable_type(struct nf_flowtable_type *type)
7864 nfnl_lock(NFNL_SUBSYS_NFTABLES);
7865 list_add_tail_rcu(&type->list, &nf_tables_flowtables);
7866 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7868 EXPORT_SYMBOL_GPL(nft_register_flowtable_type);
7870 void nft_unregister_flowtable_type(struct nf_flowtable_type *type)
7872 nfnl_lock(NFNL_SUBSYS_NFTABLES);
7873 list_del_rcu(&type->list);
7874 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7876 EXPORT_SYMBOL_GPL(nft_unregister_flowtable_type);
7878 static const struct nla_policy nft_flowtable_policy[NFTA_FLOWTABLE_MAX + 1] = {
7879 [NFTA_FLOWTABLE_TABLE] = { .type = NLA_STRING,
7880 .len = NFT_NAME_MAXLEN - 1 },
7881 [NFTA_FLOWTABLE_NAME] = { .type = NLA_STRING,
7882 .len = NFT_NAME_MAXLEN - 1 },
7883 [NFTA_FLOWTABLE_HOOK] = { .type = NLA_NESTED },
7884 [NFTA_FLOWTABLE_HANDLE] = { .type = NLA_U64 },
7885 [NFTA_FLOWTABLE_FLAGS] = { .type = NLA_U32 },
7888 struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table,
7889 const struct nlattr *nla, u8 genmask)
7891 struct nft_flowtable *flowtable;
7893 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
7894 if (!nla_strcmp(nla, flowtable->name) &&
7895 nft_active_genmask(flowtable, genmask))
7898 return ERR_PTR(-ENOENT);
7900 EXPORT_SYMBOL_GPL(nft_flowtable_lookup);
7902 void nf_tables_deactivate_flowtable(const struct nft_ctx *ctx,
7903 struct nft_flowtable *flowtable,
7904 enum nft_trans_phase phase)
7907 case NFT_TRANS_PREPARE_ERROR:
7908 case NFT_TRANS_PREPARE:
7909 case NFT_TRANS_ABORT:
7910 case NFT_TRANS_RELEASE:
7911 nft_use_dec(&flowtable->use);
7917 EXPORT_SYMBOL_GPL(nf_tables_deactivate_flowtable);
7919 static struct nft_flowtable *
7920 nft_flowtable_lookup_byhandle(const struct nft_table *table,
7921 const struct nlattr *nla, u8 genmask)
7923 struct nft_flowtable *flowtable;
7925 list_for_each_entry(flowtable, &table->flowtables, list) {
7926 if (be64_to_cpu(nla_get_be64(nla)) == flowtable->handle &&
7927 nft_active_genmask(flowtable, genmask))
7930 return ERR_PTR(-ENOENT);
7933 struct nft_flowtable_hook {
7936 struct list_head list;
7939 static const struct nla_policy nft_flowtable_hook_policy[NFTA_FLOWTABLE_HOOK_MAX + 1] = {
7940 [NFTA_FLOWTABLE_HOOK_NUM] = { .type = NLA_U32 },
7941 [NFTA_FLOWTABLE_HOOK_PRIORITY] = { .type = NLA_U32 },
7942 [NFTA_FLOWTABLE_HOOK_DEVS] = { .type = NLA_NESTED },
7945 static int nft_flowtable_parse_hook(const struct nft_ctx *ctx,
7946 const struct nlattr * const nla[],
7947 struct nft_flowtable_hook *flowtable_hook,
7948 struct nft_flowtable *flowtable,
7949 struct netlink_ext_ack *extack, bool add)
7951 struct nlattr *tb[NFTA_FLOWTABLE_HOOK_MAX + 1];
7952 struct nft_hook *hook;
7953 int hooknum, priority;
7956 INIT_LIST_HEAD(&flowtable_hook->list);
7958 err = nla_parse_nested_deprecated(tb, NFTA_FLOWTABLE_HOOK_MAX,
7959 nla[NFTA_FLOWTABLE_HOOK],
7960 nft_flowtable_hook_policy, NULL);
7965 if (!tb[NFTA_FLOWTABLE_HOOK_NUM] ||
7966 !tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) {
7967 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
7971 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
7972 if (hooknum != NF_NETDEV_INGRESS)
7975 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
7977 flowtable_hook->priority = priority;
7978 flowtable_hook->num = hooknum;
7980 if (tb[NFTA_FLOWTABLE_HOOK_NUM]) {
7981 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
7982 if (hooknum != flowtable->hooknum)
7986 if (tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) {
7987 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
7988 if (priority != flowtable->data.priority)
7992 flowtable_hook->priority = flowtable->data.priority;
7993 flowtable_hook->num = flowtable->hooknum;
7996 if (tb[NFTA_FLOWTABLE_HOOK_DEVS]) {
7997 err = nf_tables_parse_netdev_hooks(ctx->net,
7998 tb[NFTA_FLOWTABLE_HOOK_DEVS],
7999 &flowtable_hook->list,
8005 list_for_each_entry(hook, &flowtable_hook->list, list) {
8006 hook->ops.pf = NFPROTO_NETDEV;
8007 hook->ops.hooknum = flowtable_hook->num;
8008 hook->ops.priority = flowtable_hook->priority;
8009 hook->ops.priv = &flowtable->data;
8010 hook->ops.hook = flowtable->data.type->hook;
8016 static const struct nf_flowtable_type *__nft_flowtable_type_get(u8 family)
8018 const struct nf_flowtable_type *type;
8020 list_for_each_entry(type, &nf_tables_flowtables, list) {
8021 if (family == type->family)
8027 static const struct nf_flowtable_type *
8028 nft_flowtable_type_get(struct net *net, u8 family)
8030 const struct nf_flowtable_type *type;
8032 type = __nft_flowtable_type_get(family);
8033 if (type != NULL && try_module_get(type->owner))
8036 lockdep_nfnl_nft_mutex_not_held();
8037 #ifdef CONFIG_MODULES
8039 if (nft_request_module(net, "nf-flowtable-%u", family) == -EAGAIN)
8040 return ERR_PTR(-EAGAIN);
8043 return ERR_PTR(-ENOENT);
8046 /* Only called from error and netdev event paths. */
8047 static void nft_unregister_flowtable_hook(struct net *net,
8048 struct nft_flowtable *flowtable,
8049 struct nft_hook *hook)
8051 nf_unregister_net_hook(net, &hook->ops);
8052 flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
8056 static void __nft_unregister_flowtable_net_hooks(struct net *net,
8057 struct list_head *hook_list,
8058 bool release_netdev)
8060 struct nft_hook *hook, *next;
8062 list_for_each_entry_safe(hook, next, hook_list, list) {
8063 nf_unregister_net_hook(net, &hook->ops);
8064 if (release_netdev) {
8065 list_del(&hook->list);
8066 kfree_rcu(hook, rcu);
8071 static void nft_unregister_flowtable_net_hooks(struct net *net,
8072 struct list_head *hook_list)
8074 __nft_unregister_flowtable_net_hooks(net, hook_list, false);
8077 static int nft_register_flowtable_net_hooks(struct net *net,
8078 struct nft_table *table,
8079 struct list_head *hook_list,
8080 struct nft_flowtable *flowtable)
8082 struct nft_hook *hook, *hook2, *next;
8083 struct nft_flowtable *ft;
8086 list_for_each_entry(hook, hook_list, list) {
8087 list_for_each_entry(ft, &table->flowtables, list) {
8088 if (!nft_is_active_next(net, ft))
8091 list_for_each_entry(hook2, &ft->hook_list, list) {
8092 if (hook->ops.dev == hook2->ops.dev &&
8093 hook->ops.pf == hook2->ops.pf) {
8095 goto err_unregister_net_hooks;
8100 err = flowtable->data.type->setup(&flowtable->data,
8104 goto err_unregister_net_hooks;
8106 err = nf_register_net_hook(net, &hook->ops);
8108 flowtable->data.type->setup(&flowtable->data,
8111 goto err_unregister_net_hooks;
8119 err_unregister_net_hooks:
8120 list_for_each_entry_safe(hook, next, hook_list, list) {
8124 nft_unregister_flowtable_hook(net, flowtable, hook);
8125 list_del_rcu(&hook->list);
8126 kfree_rcu(hook, rcu);
8132 static void nft_hooks_destroy(struct list_head *hook_list)
8134 struct nft_hook *hook, *next;
8136 list_for_each_entry_safe(hook, next, hook_list, list) {
8137 list_del_rcu(&hook->list);
8138 kfree_rcu(hook, rcu);
8142 static int nft_flowtable_update(struct nft_ctx *ctx, const struct nlmsghdr *nlh,
8143 struct nft_flowtable *flowtable,
8144 struct netlink_ext_ack *extack)
8146 const struct nlattr * const *nla = ctx->nla;
8147 struct nft_flowtable_hook flowtable_hook;
8148 struct nft_hook *hook, *next;
8149 struct nft_trans *trans;
8150 bool unregister = false;
8154 err = nft_flowtable_parse_hook(ctx, nla, &flowtable_hook, flowtable,
8159 list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
8160 if (nft_hook_list_find(&flowtable->hook_list, hook)) {
8161 list_del(&hook->list);
8166 if (nla[NFTA_FLOWTABLE_FLAGS]) {
8167 flags = ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
8168 if (flags & ~NFT_FLOWTABLE_MASK) {
8170 goto err_flowtable_update_hook;
8172 if ((flowtable->data.flags & NFT_FLOWTABLE_HW_OFFLOAD) ^
8173 (flags & NFT_FLOWTABLE_HW_OFFLOAD)) {
8175 goto err_flowtable_update_hook;
8178 flags = flowtable->data.flags;
8181 err = nft_register_flowtable_net_hooks(ctx->net, ctx->table,
8182 &flowtable_hook.list, flowtable);
8184 goto err_flowtable_update_hook;
8186 trans = nft_trans_alloc(ctx, NFT_MSG_NEWFLOWTABLE,
8187 sizeof(struct nft_trans_flowtable));
8191 goto err_flowtable_update_hook;
8194 nft_trans_flowtable_flags(trans) = flags;
8195 nft_trans_flowtable(trans) = flowtable;
8196 nft_trans_flowtable_update(trans) = true;
8197 INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
8198 list_splice(&flowtable_hook.list, &nft_trans_flowtable_hooks(trans));
8200 nft_trans_commit_list_add_tail(ctx->net, trans);
8204 err_flowtable_update_hook:
8205 list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
8207 nft_unregister_flowtable_hook(ctx->net, flowtable, hook);
8208 list_del_rcu(&hook->list);
8209 kfree_rcu(hook, rcu);
8216 static int nf_tables_newflowtable(struct sk_buff *skb,
8217 const struct nfnl_info *info,
8218 const struct nlattr * const nla[])
8220 struct netlink_ext_ack *extack = info->extack;
8221 struct nft_flowtable_hook flowtable_hook;
8222 u8 genmask = nft_genmask_next(info->net);
8223 u8 family = info->nfmsg->nfgen_family;
8224 const struct nf_flowtable_type *type;
8225 struct nft_flowtable *flowtable;
8226 struct nft_hook *hook, *next;
8227 struct net *net = info->net;
8228 struct nft_table *table;
8232 if (!nla[NFTA_FLOWTABLE_TABLE] ||
8233 !nla[NFTA_FLOWTABLE_NAME] ||
8234 !nla[NFTA_FLOWTABLE_HOOK])
8237 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
8238 genmask, NETLINK_CB(skb).portid);
8239 if (IS_ERR(table)) {
8240 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
8241 return PTR_ERR(table);
8244 flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
8246 if (IS_ERR(flowtable)) {
8247 err = PTR_ERR(flowtable);
8248 if (err != -ENOENT) {
8249 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
8253 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
8254 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
8258 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
8260 return nft_flowtable_update(&ctx, info->nlh, flowtable, extack);
8263 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
8265 if (!nft_use_inc(&table->use))
8268 flowtable = kzalloc(sizeof(*flowtable), GFP_KERNEL_ACCOUNT);
8271 goto flowtable_alloc;
8274 flowtable->table = table;
8275 flowtable->handle = nf_tables_alloc_handle(table);
8276 INIT_LIST_HEAD(&flowtable->hook_list);
8278 flowtable->name = nla_strdup(nla[NFTA_FLOWTABLE_NAME], GFP_KERNEL_ACCOUNT);
8279 if (!flowtable->name) {
8284 type = nft_flowtable_type_get(net, family);
8286 err = PTR_ERR(type);
8290 if (nla[NFTA_FLOWTABLE_FLAGS]) {
8291 flowtable->data.flags =
8292 ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
8293 if (flowtable->data.flags & ~NFT_FLOWTABLE_MASK) {
8299 write_pnet(&flowtable->data.net, net);
8300 flowtable->data.type = type;
8301 err = type->init(&flowtable->data);
8305 err = nft_flowtable_parse_hook(&ctx, nla, &flowtable_hook, flowtable,
8310 list_splice(&flowtable_hook.list, &flowtable->hook_list);
8311 flowtable->data.priority = flowtable_hook.priority;
8312 flowtable->hooknum = flowtable_hook.num;
8314 err = nft_register_flowtable_net_hooks(ctx.net, table,
8315 &flowtable->hook_list,
8318 nft_hooks_destroy(&flowtable->hook_list);
8322 err = nft_trans_flowtable_add(&ctx, NFT_MSG_NEWFLOWTABLE, flowtable);
8326 list_add_tail_rcu(&flowtable->list, &table->flowtables);
8330 list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
8331 nft_unregister_flowtable_hook(net, flowtable, hook);
8332 list_del_rcu(&hook->list);
8333 kfree_rcu(hook, rcu);
8336 flowtable->data.type->free(&flowtable->data);
8338 module_put(type->owner);
8340 kfree(flowtable->name);
8344 nft_use_dec_restore(&table->use);
8349 static void nft_flowtable_hook_release(struct nft_flowtable_hook *flowtable_hook)
8351 struct nft_hook *this, *next;
8353 list_for_each_entry_safe(this, next, &flowtable_hook->list, list) {
8354 list_del(&this->list);
8359 static int nft_delflowtable_hook(struct nft_ctx *ctx,
8360 struct nft_flowtable *flowtable,
8361 struct netlink_ext_ack *extack)
8363 const struct nlattr * const *nla = ctx->nla;
8364 struct nft_flowtable_hook flowtable_hook;
8365 LIST_HEAD(flowtable_del_list);
8366 struct nft_hook *this, *hook;
8367 struct nft_trans *trans;
8370 err = nft_flowtable_parse_hook(ctx, nla, &flowtable_hook, flowtable,
8375 list_for_each_entry(this, &flowtable_hook.list, list) {
8376 hook = nft_hook_list_find(&flowtable->hook_list, this);
8379 goto err_flowtable_del_hook;
8381 list_move(&hook->list, &flowtable_del_list);
8384 trans = nft_trans_alloc(ctx, NFT_MSG_DELFLOWTABLE,
8385 sizeof(struct nft_trans_flowtable));
8388 goto err_flowtable_del_hook;
8391 nft_trans_flowtable(trans) = flowtable;
8392 nft_trans_flowtable_update(trans) = true;
8393 INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
8394 list_splice(&flowtable_del_list, &nft_trans_flowtable_hooks(trans));
8395 nft_flowtable_hook_release(&flowtable_hook);
8397 nft_trans_commit_list_add_tail(ctx->net, trans);
8401 err_flowtable_del_hook:
8402 list_splice(&flowtable_del_list, &flowtable->hook_list);
8403 nft_flowtable_hook_release(&flowtable_hook);
8408 static int nf_tables_delflowtable(struct sk_buff *skb,
8409 const struct nfnl_info *info,
8410 const struct nlattr * const nla[])
8412 struct netlink_ext_ack *extack = info->extack;
8413 u8 genmask = nft_genmask_next(info->net);
8414 u8 family = info->nfmsg->nfgen_family;
8415 struct nft_flowtable *flowtable;
8416 struct net *net = info->net;
8417 const struct nlattr *attr;
8418 struct nft_table *table;
8421 if (!nla[NFTA_FLOWTABLE_TABLE] ||
8422 (!nla[NFTA_FLOWTABLE_NAME] &&
8423 !nla[NFTA_FLOWTABLE_HANDLE]))
8426 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
8427 genmask, NETLINK_CB(skb).portid);
8428 if (IS_ERR(table)) {
8429 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
8430 return PTR_ERR(table);
8433 if (nla[NFTA_FLOWTABLE_HANDLE]) {
8434 attr = nla[NFTA_FLOWTABLE_HANDLE];
8435 flowtable = nft_flowtable_lookup_byhandle(table, attr, genmask);
8437 attr = nla[NFTA_FLOWTABLE_NAME];
8438 flowtable = nft_flowtable_lookup(table, attr, genmask);
8441 if (IS_ERR(flowtable)) {
8442 if (PTR_ERR(flowtable) == -ENOENT &&
8443 NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYFLOWTABLE)
8446 NL_SET_BAD_ATTR(extack, attr);
8447 return PTR_ERR(flowtable);
8450 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
8452 if (nla[NFTA_FLOWTABLE_HOOK])
8453 return nft_delflowtable_hook(&ctx, flowtable, extack);
8455 if (flowtable->use > 0) {
8456 NL_SET_BAD_ATTR(extack, attr);
8460 return nft_delflowtable(&ctx, flowtable);
8463 static int nf_tables_fill_flowtable_info(struct sk_buff *skb, struct net *net,
8464 u32 portid, u32 seq, int event,
8465 u32 flags, int family,
8466 struct nft_flowtable *flowtable,
8467 struct list_head *hook_list)
8469 struct nlattr *nest, *nest_devs;
8470 struct nft_hook *hook;
8471 struct nlmsghdr *nlh;
8473 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
8474 nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
8475 NFNETLINK_V0, nft_base_seq(net));
8477 goto nla_put_failure;
8479 if (nla_put_string(skb, NFTA_FLOWTABLE_TABLE, flowtable->table->name) ||
8480 nla_put_string(skb, NFTA_FLOWTABLE_NAME, flowtable->name) ||
8481 nla_put_be64(skb, NFTA_FLOWTABLE_HANDLE, cpu_to_be64(flowtable->handle),
8482 NFTA_FLOWTABLE_PAD))
8483 goto nla_put_failure;
8485 if (event == NFT_MSG_DELFLOWTABLE && !hook_list) {
8486 nlmsg_end(skb, nlh);
8490 if (nla_put_be32(skb, NFTA_FLOWTABLE_USE, htonl(flowtable->use)) ||
8491 nla_put_be32(skb, NFTA_FLOWTABLE_FLAGS, htonl(flowtable->data.flags)))
8492 goto nla_put_failure;
8494 nest = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK);
8496 goto nla_put_failure;
8497 if (nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_NUM, htonl(flowtable->hooknum)) ||
8498 nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_PRIORITY, htonl(flowtable->data.priority)))
8499 goto nla_put_failure;
8501 nest_devs = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK_DEVS);
8503 goto nla_put_failure;
8506 hook_list = &flowtable->hook_list;
8508 list_for_each_entry_rcu(hook, hook_list, list) {
8509 if (nla_put_string(skb, NFTA_DEVICE_NAME, hook->ops.dev->name))
8510 goto nla_put_failure;
8512 nla_nest_end(skb, nest_devs);
8513 nla_nest_end(skb, nest);
8515 nlmsg_end(skb, nlh);
8519 nlmsg_trim(skb, nlh);
8523 struct nft_flowtable_filter {
8527 static int nf_tables_dump_flowtable(struct sk_buff *skb,
8528 struct netlink_callback *cb)
8530 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
8531 struct nft_flowtable_filter *filter = cb->data;
8532 unsigned int idx = 0, s_idx = cb->args[0];
8533 struct net *net = sock_net(skb->sk);
8534 int family = nfmsg->nfgen_family;
8535 struct nft_flowtable *flowtable;
8536 struct nftables_pernet *nft_net;
8537 const struct nft_table *table;
8540 nft_net = nft_pernet(net);
8541 cb->seq = READ_ONCE(nft_net->base_seq);
8543 list_for_each_entry_rcu(table, &nft_net->tables, list) {
8544 if (family != NFPROTO_UNSPEC && family != table->family)
8547 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
8548 if (!nft_is_active(net, flowtable))
8553 memset(&cb->args[1], 0,
8554 sizeof(cb->args) - sizeof(cb->args[0]));
8555 if (filter && filter->table &&
8556 strcmp(filter->table, table->name))
8559 if (nf_tables_fill_flowtable_info(skb, net, NETLINK_CB(cb->skb).portid,
8561 NFT_MSG_NEWFLOWTABLE,
8562 NLM_F_MULTI | NLM_F_APPEND,
8564 flowtable, NULL) < 0)
8567 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
8579 static int nf_tables_dump_flowtable_start(struct netlink_callback *cb)
8581 const struct nlattr * const *nla = cb->data;
8582 struct nft_flowtable_filter *filter = NULL;
8584 if (nla[NFTA_FLOWTABLE_TABLE]) {
8585 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
8589 filter->table = nla_strdup(nla[NFTA_FLOWTABLE_TABLE],
8591 if (!filter->table) {
8601 static int nf_tables_dump_flowtable_done(struct netlink_callback *cb)
8603 struct nft_flowtable_filter *filter = cb->data;
8608 kfree(filter->table);
8614 /* called with rcu_read_lock held */
8615 static int nf_tables_getflowtable(struct sk_buff *skb,
8616 const struct nfnl_info *info,
8617 const struct nlattr * const nla[])
8619 u8 genmask = nft_genmask_cur(info->net);
8620 u8 family = info->nfmsg->nfgen_family;
8621 struct nft_flowtable *flowtable;
8622 const struct nft_table *table;
8623 struct net *net = info->net;
8624 struct sk_buff *skb2;
8627 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
8628 struct netlink_dump_control c = {
8629 .start = nf_tables_dump_flowtable_start,
8630 .dump = nf_tables_dump_flowtable,
8631 .done = nf_tables_dump_flowtable_done,
8632 .module = THIS_MODULE,
8633 .data = (void *)nla,
8636 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
8639 if (!nla[NFTA_FLOWTABLE_NAME])
8642 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
8645 return PTR_ERR(table);
8647 flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
8649 if (IS_ERR(flowtable))
8650 return PTR_ERR(flowtable);
8652 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
8656 err = nf_tables_fill_flowtable_info(skb2, net, NETLINK_CB(skb).portid,
8657 info->nlh->nlmsg_seq,
8658 NFT_MSG_NEWFLOWTABLE, 0, family,
8661 goto err_fill_flowtable_info;
8663 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
8665 err_fill_flowtable_info:
8670 static void nf_tables_flowtable_notify(struct nft_ctx *ctx,
8671 struct nft_flowtable *flowtable,
8672 struct list_head *hook_list, int event)
8674 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
8675 struct sk_buff *skb;
8680 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
8683 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
8687 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
8688 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
8690 err = nf_tables_fill_flowtable_info(skb, ctx->net, ctx->portid,
8691 ctx->seq, event, flags,
8692 ctx->family, flowtable, hook_list);
8698 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
8701 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
8704 static void nf_tables_flowtable_destroy(struct nft_flowtable *flowtable)
8706 struct nft_hook *hook, *next;
8708 flowtable->data.type->free(&flowtable->data);
8709 list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
8710 flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
8712 list_del_rcu(&hook->list);
8715 kfree(flowtable->name);
8716 module_put(flowtable->data.type->owner);
8720 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
8721 u32 portid, u32 seq)
8723 struct nftables_pernet *nft_net = nft_pernet(net);
8724 struct nlmsghdr *nlh;
8725 char buf[TASK_COMM_LEN];
8726 int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN);
8728 nlh = nfnl_msg_put(skb, portid, seq, event, 0, AF_UNSPEC,
8729 NFNETLINK_V0, nft_base_seq(net));
8731 goto nla_put_failure;
8733 if (nla_put_be32(skb, NFTA_GEN_ID, htonl(nft_net->base_seq)) ||
8734 nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) ||
8735 nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current)))
8736 goto nla_put_failure;
8738 nlmsg_end(skb, nlh);
8742 nlmsg_trim(skb, nlh);
8746 static void nft_flowtable_event(unsigned long event, struct net_device *dev,
8747 struct nft_flowtable *flowtable)
8749 struct nft_hook *hook;
8751 list_for_each_entry(hook, &flowtable->hook_list, list) {
8752 if (hook->ops.dev != dev)
8755 /* flow_offload_netdev_event() cleans up entries for us. */
8756 nft_unregister_flowtable_hook(dev_net(dev), flowtable, hook);
8757 list_del_rcu(&hook->list);
8758 kfree_rcu(hook, rcu);
8763 static int nf_tables_flowtable_event(struct notifier_block *this,
8764 unsigned long event, void *ptr)
8766 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
8767 struct nft_flowtable *flowtable;
8768 struct nftables_pernet *nft_net;
8769 struct nft_table *table;
8772 if (event != NETDEV_UNREGISTER)
8776 nft_net = nft_pernet(net);
8777 mutex_lock(&nft_net->commit_mutex);
8778 list_for_each_entry(table, &nft_net->tables, list) {
8779 list_for_each_entry(flowtable, &table->flowtables, list) {
8780 nft_flowtable_event(event, dev, flowtable);
8783 mutex_unlock(&nft_net->commit_mutex);
8788 static struct notifier_block nf_tables_flowtable_notifier = {
8789 .notifier_call = nf_tables_flowtable_event,
8792 static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
8795 struct nlmsghdr *nlh = nlmsg_hdr(skb);
8796 struct sk_buff *skb2;
8799 if (!nlmsg_report(nlh) &&
8800 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
8803 skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
8807 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
8814 nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
8815 nlmsg_report(nlh), GFP_KERNEL);
8818 nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
8822 static int nf_tables_getgen(struct sk_buff *skb, const struct nfnl_info *info,
8823 const struct nlattr * const nla[])
8825 struct sk_buff *skb2;
8828 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
8832 err = nf_tables_fill_gen_info(skb2, info->net, NETLINK_CB(skb).portid,
8833 info->nlh->nlmsg_seq);
8835 goto err_fill_gen_info;
8837 return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid);
8844 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
8845 [NFT_MSG_NEWTABLE] = {
8846 .call = nf_tables_newtable,
8847 .type = NFNL_CB_BATCH,
8848 .attr_count = NFTA_TABLE_MAX,
8849 .policy = nft_table_policy,
8851 [NFT_MSG_GETTABLE] = {
8852 .call = nf_tables_gettable,
8853 .type = NFNL_CB_RCU,
8854 .attr_count = NFTA_TABLE_MAX,
8855 .policy = nft_table_policy,
8857 [NFT_MSG_DELTABLE] = {
8858 .call = nf_tables_deltable,
8859 .type = NFNL_CB_BATCH,
8860 .attr_count = NFTA_TABLE_MAX,
8861 .policy = nft_table_policy,
8863 [NFT_MSG_DESTROYTABLE] = {
8864 .call = nf_tables_deltable,
8865 .type = NFNL_CB_BATCH,
8866 .attr_count = NFTA_TABLE_MAX,
8867 .policy = nft_table_policy,
8869 [NFT_MSG_NEWCHAIN] = {
8870 .call = nf_tables_newchain,
8871 .type = NFNL_CB_BATCH,
8872 .attr_count = NFTA_CHAIN_MAX,
8873 .policy = nft_chain_policy,
8875 [NFT_MSG_GETCHAIN] = {
8876 .call = nf_tables_getchain,
8877 .type = NFNL_CB_RCU,
8878 .attr_count = NFTA_CHAIN_MAX,
8879 .policy = nft_chain_policy,
8881 [NFT_MSG_DELCHAIN] = {
8882 .call = nf_tables_delchain,
8883 .type = NFNL_CB_BATCH,
8884 .attr_count = NFTA_CHAIN_MAX,
8885 .policy = nft_chain_policy,
8887 [NFT_MSG_DESTROYCHAIN] = {
8888 .call = nf_tables_delchain,
8889 .type = NFNL_CB_BATCH,
8890 .attr_count = NFTA_CHAIN_MAX,
8891 .policy = nft_chain_policy,
8893 [NFT_MSG_NEWRULE] = {
8894 .call = nf_tables_newrule,
8895 .type = NFNL_CB_BATCH,
8896 .attr_count = NFTA_RULE_MAX,
8897 .policy = nft_rule_policy,
8899 [NFT_MSG_GETRULE] = {
8900 .call = nf_tables_getrule,
8901 .type = NFNL_CB_RCU,
8902 .attr_count = NFTA_RULE_MAX,
8903 .policy = nft_rule_policy,
8905 [NFT_MSG_GETRULE_RESET] = {
8906 .call = nf_tables_getrule,
8907 .type = NFNL_CB_RCU,
8908 .attr_count = NFTA_RULE_MAX,
8909 .policy = nft_rule_policy,
8911 [NFT_MSG_DELRULE] = {
8912 .call = nf_tables_delrule,
8913 .type = NFNL_CB_BATCH,
8914 .attr_count = NFTA_RULE_MAX,
8915 .policy = nft_rule_policy,
8917 [NFT_MSG_DESTROYRULE] = {
8918 .call = nf_tables_delrule,
8919 .type = NFNL_CB_BATCH,
8920 .attr_count = NFTA_RULE_MAX,
8921 .policy = nft_rule_policy,
8923 [NFT_MSG_NEWSET] = {
8924 .call = nf_tables_newset,
8925 .type = NFNL_CB_BATCH,
8926 .attr_count = NFTA_SET_MAX,
8927 .policy = nft_set_policy,
8929 [NFT_MSG_GETSET] = {
8930 .call = nf_tables_getset,
8931 .type = NFNL_CB_RCU,
8932 .attr_count = NFTA_SET_MAX,
8933 .policy = nft_set_policy,
8935 [NFT_MSG_DELSET] = {
8936 .call = nf_tables_delset,
8937 .type = NFNL_CB_BATCH,
8938 .attr_count = NFTA_SET_MAX,
8939 .policy = nft_set_policy,
8941 [NFT_MSG_DESTROYSET] = {
8942 .call = nf_tables_delset,
8943 .type = NFNL_CB_BATCH,
8944 .attr_count = NFTA_SET_MAX,
8945 .policy = nft_set_policy,
8947 [NFT_MSG_NEWSETELEM] = {
8948 .call = nf_tables_newsetelem,
8949 .type = NFNL_CB_BATCH,
8950 .attr_count = NFTA_SET_ELEM_LIST_MAX,
8951 .policy = nft_set_elem_list_policy,
8953 [NFT_MSG_GETSETELEM] = {
8954 .call = nf_tables_getsetelem,
8955 .type = NFNL_CB_RCU,
8956 .attr_count = NFTA_SET_ELEM_LIST_MAX,
8957 .policy = nft_set_elem_list_policy,
8959 [NFT_MSG_GETSETELEM_RESET] = {
8960 .call = nf_tables_getsetelem,
8961 .type = NFNL_CB_RCU,
8962 .attr_count = NFTA_SET_ELEM_LIST_MAX,
8963 .policy = nft_set_elem_list_policy,
8965 [NFT_MSG_DELSETELEM] = {
8966 .call = nf_tables_delsetelem,
8967 .type = NFNL_CB_BATCH,
8968 .attr_count = NFTA_SET_ELEM_LIST_MAX,
8969 .policy = nft_set_elem_list_policy,
8971 [NFT_MSG_DESTROYSETELEM] = {
8972 .call = nf_tables_delsetelem,
8973 .type = NFNL_CB_BATCH,
8974 .attr_count = NFTA_SET_ELEM_LIST_MAX,
8975 .policy = nft_set_elem_list_policy,
8977 [NFT_MSG_GETGEN] = {
8978 .call = nf_tables_getgen,
8979 .type = NFNL_CB_RCU,
8981 [NFT_MSG_NEWOBJ] = {
8982 .call = nf_tables_newobj,
8983 .type = NFNL_CB_BATCH,
8984 .attr_count = NFTA_OBJ_MAX,
8985 .policy = nft_obj_policy,
8987 [NFT_MSG_GETOBJ] = {
8988 .call = nf_tables_getobj,
8989 .type = NFNL_CB_RCU,
8990 .attr_count = NFTA_OBJ_MAX,
8991 .policy = nft_obj_policy,
8993 [NFT_MSG_DELOBJ] = {
8994 .call = nf_tables_delobj,
8995 .type = NFNL_CB_BATCH,
8996 .attr_count = NFTA_OBJ_MAX,
8997 .policy = nft_obj_policy,
8999 [NFT_MSG_DESTROYOBJ] = {
9000 .call = nf_tables_delobj,
9001 .type = NFNL_CB_BATCH,
9002 .attr_count = NFTA_OBJ_MAX,
9003 .policy = nft_obj_policy,
9005 [NFT_MSG_GETOBJ_RESET] = {
9006 .call = nf_tables_getobj,
9007 .type = NFNL_CB_RCU,
9008 .attr_count = NFTA_OBJ_MAX,
9009 .policy = nft_obj_policy,
9011 [NFT_MSG_NEWFLOWTABLE] = {
9012 .call = nf_tables_newflowtable,
9013 .type = NFNL_CB_BATCH,
9014 .attr_count = NFTA_FLOWTABLE_MAX,
9015 .policy = nft_flowtable_policy,
9017 [NFT_MSG_GETFLOWTABLE] = {
9018 .call = nf_tables_getflowtable,
9019 .type = NFNL_CB_RCU,
9020 .attr_count = NFTA_FLOWTABLE_MAX,
9021 .policy = nft_flowtable_policy,
9023 [NFT_MSG_DELFLOWTABLE] = {
9024 .call = nf_tables_delflowtable,
9025 .type = NFNL_CB_BATCH,
9026 .attr_count = NFTA_FLOWTABLE_MAX,
9027 .policy = nft_flowtable_policy,
9029 [NFT_MSG_DESTROYFLOWTABLE] = {
9030 .call = nf_tables_delflowtable,
9031 .type = NFNL_CB_BATCH,
9032 .attr_count = NFTA_FLOWTABLE_MAX,
9033 .policy = nft_flowtable_policy,
9037 static int nf_tables_validate(struct net *net)
9039 struct nftables_pernet *nft_net = nft_pernet(net);
9040 struct nft_table *table;
9042 list_for_each_entry(table, &nft_net->tables, list) {
9043 switch (table->validate_state) {
9044 case NFT_VALIDATE_SKIP:
9046 case NFT_VALIDATE_NEED:
9047 nft_validate_state_update(table, NFT_VALIDATE_DO);
9049 case NFT_VALIDATE_DO:
9050 if (nft_table_validate(net, table) < 0)
9053 nft_validate_state_update(table, NFT_VALIDATE_SKIP);
9061 /* a drop policy has to be deferred until all rules have been activated,
9062 * otherwise a large ruleset that contains a drop-policy base chain will
9063 * cause all packets to get dropped until the full transaction has been
9066 * We defer the drop policy until the transaction has been finalized.
9068 static void nft_chain_commit_drop_policy(struct nft_trans *trans)
9070 struct nft_base_chain *basechain;
9072 if (nft_trans_chain_policy(trans) != NF_DROP)
9075 if (!nft_is_base_chain(trans->ctx.chain))
9078 basechain = nft_base_chain(trans->ctx.chain);
9079 basechain->policy = NF_DROP;
9082 static void nft_chain_commit_update(struct nft_trans *trans)
9084 struct nft_base_chain *basechain;
9086 if (nft_trans_chain_name(trans)) {
9087 rhltable_remove(&trans->ctx.table->chains_ht,
9088 &trans->ctx.chain->rhlhead,
9089 nft_chain_ht_params);
9090 swap(trans->ctx.chain->name, nft_trans_chain_name(trans));
9091 rhltable_insert_key(&trans->ctx.table->chains_ht,
9092 trans->ctx.chain->name,
9093 &trans->ctx.chain->rhlhead,
9094 nft_chain_ht_params);
9097 if (!nft_is_base_chain(trans->ctx.chain))
9100 nft_chain_stats_replace(trans);
9102 basechain = nft_base_chain(trans->ctx.chain);
9104 switch (nft_trans_chain_policy(trans)) {
9107 basechain->policy = nft_trans_chain_policy(trans);
9112 static void nft_obj_commit_update(struct nft_trans *trans)
9114 struct nft_object *newobj;
9115 struct nft_object *obj;
9117 obj = nft_trans_obj(trans);
9118 newobj = nft_trans_obj_newobj(trans);
9120 if (obj->ops->update)
9121 obj->ops->update(obj, newobj);
9123 nft_obj_destroy(&trans->ctx, newobj);
9126 static void nft_commit_release(struct nft_trans *trans)
9128 switch (trans->msg_type) {
9129 case NFT_MSG_DELTABLE:
9130 case NFT_MSG_DESTROYTABLE:
9131 nf_tables_table_destroy(&trans->ctx);
9133 case NFT_MSG_NEWCHAIN:
9134 free_percpu(nft_trans_chain_stats(trans));
9135 kfree(nft_trans_chain_name(trans));
9137 case NFT_MSG_DELCHAIN:
9138 case NFT_MSG_DESTROYCHAIN:
9139 if (nft_trans_chain_update(trans))
9140 nft_hooks_destroy(&nft_trans_chain_hooks(trans));
9142 nf_tables_chain_destroy(&trans->ctx);
9144 case NFT_MSG_DELRULE:
9145 case NFT_MSG_DESTROYRULE:
9146 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
9148 case NFT_MSG_DELSET:
9149 case NFT_MSG_DESTROYSET:
9150 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
9152 case NFT_MSG_DELSETELEM:
9153 case NFT_MSG_DESTROYSETELEM:
9154 nf_tables_set_elem_destroy(&trans->ctx,
9155 nft_trans_elem_set(trans),
9156 nft_trans_elem(trans).priv);
9158 case NFT_MSG_DELOBJ:
9159 case NFT_MSG_DESTROYOBJ:
9160 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
9162 case NFT_MSG_DELFLOWTABLE:
9163 case NFT_MSG_DESTROYFLOWTABLE:
9164 if (nft_trans_flowtable_update(trans))
9165 nft_hooks_destroy(&nft_trans_flowtable_hooks(trans));
9167 nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
9172 put_net(trans->ctx.net);
9177 static void nf_tables_trans_destroy_work(struct work_struct *w)
9179 struct nft_trans *trans, *next;
9182 spin_lock(&nf_tables_destroy_list_lock);
9183 list_splice_init(&nf_tables_destroy_list, &head);
9184 spin_unlock(&nf_tables_destroy_list_lock);
9186 if (list_empty(&head))
9191 list_for_each_entry_safe(trans, next, &head, list) {
9192 nft_trans_list_del(trans);
9193 nft_commit_release(trans);
9197 void nf_tables_trans_destroy_flush_work(void)
9199 flush_work(&trans_destroy_work);
9201 EXPORT_SYMBOL_GPL(nf_tables_trans_destroy_flush_work);
9203 static bool nft_expr_reduce(struct nft_regs_track *track,
9204 const struct nft_expr *expr)
9209 static int nf_tables_commit_chain_prepare(struct net *net, struct nft_chain *chain)
9211 const struct nft_expr *expr, *last;
9212 struct nft_regs_track track = {};
9213 unsigned int size, data_size;
9214 void *data, *data_boundary;
9215 struct nft_rule_dp *prule;
9216 struct nft_rule *rule;
9218 /* already handled or inactive chain? */
9219 if (chain->blob_next || !nft_is_active_next(net, chain))
9223 list_for_each_entry(rule, &chain->rules, list) {
9224 if (nft_is_active_next(net, rule)) {
9225 data_size += sizeof(*prule) + rule->dlen;
9226 if (data_size > INT_MAX)
9231 chain->blob_next = nf_tables_chain_alloc_rules(chain, data_size);
9232 if (!chain->blob_next)
9235 data = (void *)chain->blob_next->data;
9236 data_boundary = data + data_size;
9239 list_for_each_entry(rule, &chain->rules, list) {
9240 if (!nft_is_active_next(net, rule))
9243 prule = (struct nft_rule_dp *)data;
9244 data += offsetof(struct nft_rule_dp, data);
9245 if (WARN_ON_ONCE(data > data_boundary))
9249 track.last = nft_expr_last(rule);
9250 nft_rule_for_each_expr(expr, last, rule) {
9253 if (nft_expr_reduce(&track, expr)) {
9258 if (WARN_ON_ONCE(data + size + expr->ops->size > data_boundary))
9261 memcpy(data + size, expr, expr->ops->size);
9262 size += expr->ops->size;
9264 if (WARN_ON_ONCE(size >= 1 << 12))
9267 prule->handle = rule->handle;
9273 chain->blob_next->size += (unsigned long)(data - (void *)prule);
9276 if (WARN_ON_ONCE(data > data_boundary))
9279 prule = (struct nft_rule_dp *)data;
9280 nft_last_rule(chain, prule);
9285 static void nf_tables_commit_chain_prepare_cancel(struct net *net)
9287 struct nftables_pernet *nft_net = nft_pernet(net);
9288 struct nft_trans *trans, *next;
9290 list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
9291 struct nft_chain *chain = trans->ctx.chain;
9293 if (trans->msg_type == NFT_MSG_NEWRULE ||
9294 trans->msg_type == NFT_MSG_DELRULE) {
9295 kvfree(chain->blob_next);
9296 chain->blob_next = NULL;
9301 static void __nf_tables_commit_chain_free_rules(struct rcu_head *h)
9303 struct nft_rule_dp_last *l = container_of(h, struct nft_rule_dp_last, h);
9308 static void nf_tables_commit_chain_free_rules_old(struct nft_rule_blob *blob)
9310 struct nft_rule_dp_last *last;
9312 /* last rule trailer is after end marker */
9313 last = (void *)blob + sizeof(*blob) + blob->size;
9316 call_rcu(&last->h, __nf_tables_commit_chain_free_rules);
9319 static void nf_tables_commit_chain(struct net *net, struct nft_chain *chain)
9321 struct nft_rule_blob *g0, *g1;
9324 next_genbit = nft_gencursor_next(net);
9326 g0 = rcu_dereference_protected(chain->blob_gen_0,
9327 lockdep_commit_lock_is_held(net));
9328 g1 = rcu_dereference_protected(chain->blob_gen_1,
9329 lockdep_commit_lock_is_held(net));
9331 /* No changes to this chain? */
9332 if (chain->blob_next == NULL) {
9333 /* chain had no change in last or next generation */
9337 * chain had no change in this generation; make sure next
9338 * one uses same rules as current generation.
9341 rcu_assign_pointer(chain->blob_gen_1, g0);
9342 nf_tables_commit_chain_free_rules_old(g1);
9344 rcu_assign_pointer(chain->blob_gen_0, g1);
9345 nf_tables_commit_chain_free_rules_old(g0);
9352 rcu_assign_pointer(chain->blob_gen_1, chain->blob_next);
9354 rcu_assign_pointer(chain->blob_gen_0, chain->blob_next);
9356 chain->blob_next = NULL;
9362 nf_tables_commit_chain_free_rules_old(g1);
9364 nf_tables_commit_chain_free_rules_old(g0);
9367 static void nft_obj_del(struct nft_object *obj)
9369 rhltable_remove(&nft_objname_ht, &obj->rhlhead, nft_objname_ht_params);
9370 list_del_rcu(&obj->list);
9373 void nft_chain_del(struct nft_chain *chain)
9375 struct nft_table *table = chain->table;
9377 WARN_ON_ONCE(rhltable_remove(&table->chains_ht, &chain->rhlhead,
9378 nft_chain_ht_params));
9379 list_del_rcu(&chain->list);
9382 static void nft_trans_gc_setelem_remove(struct nft_ctx *ctx,
9383 struct nft_trans_gc *trans)
9385 void **priv = trans->priv;
9388 for (i = 0; i < trans->count; i++) {
9389 struct nft_set_elem elem = {
9393 nft_setelem_data_deactivate(ctx->net, trans->set, &elem);
9394 nft_setelem_remove(ctx->net, trans->set, &elem);
9398 void nft_trans_gc_destroy(struct nft_trans_gc *trans)
9400 nft_set_put(trans->set);
9401 put_net(trans->net);
9405 static void nft_trans_gc_trans_free(struct rcu_head *rcu)
9407 struct nft_set_elem elem = {};
9408 struct nft_trans_gc *trans;
9409 struct nft_ctx ctx = {};
9412 trans = container_of(rcu, struct nft_trans_gc, rcu);
9413 ctx.net = read_pnet(&trans->set->net);
9415 for (i = 0; i < trans->count; i++) {
9416 elem.priv = trans->priv[i];
9417 if (!nft_setelem_is_catchall(trans->set, &elem))
9418 atomic_dec(&trans->set->nelems);
9420 nf_tables_set_elem_destroy(&ctx, trans->set, elem.priv);
9423 nft_trans_gc_destroy(trans);
9426 static bool nft_trans_gc_work_done(struct nft_trans_gc *trans)
9428 struct nftables_pernet *nft_net;
9429 struct nft_ctx ctx = {};
9431 nft_net = nft_pernet(trans->net);
9433 mutex_lock(&nft_net->commit_mutex);
9435 /* Check for race with transaction, otherwise this batch refers to
9436 * stale objects that might not be there anymore. Skip transaction if
9437 * set has been destroyed from control plane transaction in case gc
9438 * worker loses race.
9440 if (READ_ONCE(nft_net->gc_seq) != trans->seq || trans->set->dead) {
9441 mutex_unlock(&nft_net->commit_mutex);
9445 ctx.net = trans->net;
9446 ctx.table = trans->set->table;
9448 nft_trans_gc_setelem_remove(&ctx, trans);
9449 mutex_unlock(&nft_net->commit_mutex);
9454 static void nft_trans_gc_work(struct work_struct *work)
9456 struct nft_trans_gc *trans, *next;
9457 LIST_HEAD(trans_gc_list);
9459 spin_lock(&nf_tables_gc_list_lock);
9460 list_splice_init(&nf_tables_gc_list, &trans_gc_list);
9461 spin_unlock(&nf_tables_gc_list_lock);
9463 list_for_each_entry_safe(trans, next, &trans_gc_list, list) {
9464 list_del(&trans->list);
9465 if (!nft_trans_gc_work_done(trans)) {
9466 nft_trans_gc_destroy(trans);
9469 call_rcu(&trans->rcu, nft_trans_gc_trans_free);
9473 struct nft_trans_gc *nft_trans_gc_alloc(struct nft_set *set,
9474 unsigned int gc_seq, gfp_t gfp)
9476 struct net *net = read_pnet(&set->net);
9477 struct nft_trans_gc *trans;
9479 trans = kzalloc(sizeof(*trans), gfp);
9483 trans->net = maybe_get_net(net);
9489 refcount_inc(&set->refs);
9491 trans->seq = gc_seq;
9496 void nft_trans_gc_elem_add(struct nft_trans_gc *trans, void *priv)
9498 trans->priv[trans->count++] = priv;
9501 static void nft_trans_gc_queue_work(struct nft_trans_gc *trans)
9503 spin_lock(&nf_tables_gc_list_lock);
9504 list_add_tail(&trans->list, &nf_tables_gc_list);
9505 spin_unlock(&nf_tables_gc_list_lock);
9507 schedule_work(&trans_gc_work);
9510 static int nft_trans_gc_space(struct nft_trans_gc *trans)
9512 return NFT_TRANS_GC_BATCHCOUNT - trans->count;
9515 struct nft_trans_gc *nft_trans_gc_queue_async(struct nft_trans_gc *gc,
9516 unsigned int gc_seq, gfp_t gfp)
9518 if (nft_trans_gc_space(gc))
9521 nft_trans_gc_queue_work(gc);
9523 return nft_trans_gc_alloc(gc->set, gc_seq, gfp);
9526 void nft_trans_gc_queue_async_done(struct nft_trans_gc *trans)
9528 if (trans->count == 0) {
9529 nft_trans_gc_destroy(trans);
9533 nft_trans_gc_queue_work(trans);
9536 struct nft_trans_gc *nft_trans_gc_queue_sync(struct nft_trans_gc *gc, gfp_t gfp)
9538 if (WARN_ON_ONCE(!lockdep_commit_lock_is_held(gc->net)))
9541 if (nft_trans_gc_space(gc))
9544 call_rcu(&gc->rcu, nft_trans_gc_trans_free);
9546 return nft_trans_gc_alloc(gc->set, 0, gfp);
9549 void nft_trans_gc_queue_sync_done(struct nft_trans_gc *trans)
9551 WARN_ON_ONCE(!lockdep_commit_lock_is_held(trans->net));
9553 if (trans->count == 0) {
9554 nft_trans_gc_destroy(trans);
9558 call_rcu(&trans->rcu, nft_trans_gc_trans_free);
9561 struct nft_trans_gc *nft_trans_gc_catchall(struct nft_trans_gc *gc,
9562 unsigned int gc_seq)
9564 struct nft_set_elem_catchall *catchall;
9565 const struct nft_set *set = gc->set;
9566 struct nft_set_ext *ext;
9568 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
9569 ext = nft_set_elem_ext(set, catchall->elem);
9571 if (!nft_set_elem_expired(ext))
9573 if (nft_set_elem_is_dead(ext))
9576 nft_set_elem_dead(ext);
9578 gc = nft_trans_gc_queue_async(gc, gc_seq, GFP_ATOMIC);
9582 nft_trans_gc_elem_add(gc, catchall->elem);
9588 static void nf_tables_module_autoload_cleanup(struct net *net)
9590 struct nftables_pernet *nft_net = nft_pernet(net);
9591 struct nft_module_request *req, *next;
9593 WARN_ON_ONCE(!list_empty(&nft_net->commit_list));
9594 list_for_each_entry_safe(req, next, &nft_net->module_list, list) {
9595 WARN_ON_ONCE(!req->done);
9596 list_del(&req->list);
9601 static void nf_tables_commit_release(struct net *net)
9603 struct nftables_pernet *nft_net = nft_pernet(net);
9604 struct nft_trans *trans;
9606 /* all side effects have to be made visible.
9607 * For example, if a chain named 'foo' has been deleted, a
9608 * new transaction must not find it anymore.
9610 * Memory reclaim happens asynchronously from work queue
9611 * to prevent expensive synchronize_rcu() in commit phase.
9613 if (list_empty(&nft_net->commit_list)) {
9614 nf_tables_module_autoload_cleanup(net);
9615 mutex_unlock(&nft_net->commit_mutex);
9619 trans = list_last_entry(&nft_net->commit_list,
9620 struct nft_trans, list);
9621 get_net(trans->ctx.net);
9622 WARN_ON_ONCE(trans->put_net);
9624 trans->put_net = true;
9625 spin_lock(&nf_tables_destroy_list_lock);
9626 list_splice_tail_init(&nft_net->commit_list, &nf_tables_destroy_list);
9627 spin_unlock(&nf_tables_destroy_list_lock);
9629 nf_tables_module_autoload_cleanup(net);
9630 schedule_work(&trans_destroy_work);
9632 mutex_unlock(&nft_net->commit_mutex);
9635 static void nft_commit_notify(struct net *net, u32 portid)
9637 struct nftables_pernet *nft_net = nft_pernet(net);
9638 struct sk_buff *batch_skb = NULL, *nskb, *skb;
9639 unsigned char *data;
9642 list_for_each_entry_safe(skb, nskb, &nft_net->notify_list, list) {
9646 len = NLMSG_GOODSIZE - skb->len;
9647 list_del(&skb->list);
9651 if (len > 0 && NFT_CB(skb).report == NFT_CB(batch_skb).report) {
9652 data = skb_put(batch_skb, skb->len);
9653 memcpy(data, skb->data, skb->len);
9654 list_del(&skb->list);
9658 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
9659 NFT_CB(batch_skb).report, GFP_KERNEL);
9664 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
9665 NFT_CB(batch_skb).report, GFP_KERNEL);
9668 WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
9671 static int nf_tables_commit_audit_alloc(struct list_head *adl,
9672 struct nft_table *table)
9674 struct nft_audit_data *adp;
9676 list_for_each_entry(adp, adl, list) {
9677 if (adp->table == table)
9680 adp = kzalloc(sizeof(*adp), GFP_KERNEL);
9684 list_add(&adp->list, adl);
9688 static void nf_tables_commit_audit_free(struct list_head *adl)
9690 struct nft_audit_data *adp, *adn;
9692 list_for_each_entry_safe(adp, adn, adl, list) {
9693 list_del(&adp->list);
9698 static void nf_tables_commit_audit_collect(struct list_head *adl,
9699 struct nft_table *table, u32 op)
9701 struct nft_audit_data *adp;
9703 list_for_each_entry(adp, adl, list) {
9704 if (adp->table == table)
9707 WARN_ONCE(1, "table=%s not expected in commit list", table->name);
9711 if (!adp->op || adp->op > op)
9715 #define AUNFTABLENAMELEN (NFT_TABLE_MAXNAMELEN + 22)
9717 static void nf_tables_commit_audit_log(struct list_head *adl, u32 generation)
9719 struct nft_audit_data *adp, *adn;
9720 char aubuf[AUNFTABLENAMELEN];
9722 list_for_each_entry_safe(adp, adn, adl, list) {
9723 snprintf(aubuf, AUNFTABLENAMELEN, "%s:%u", adp->table->name,
9725 audit_log_nfcfg(aubuf, adp->table->family, adp->entries,
9726 nft2audit_op[adp->op], GFP_KERNEL);
9727 list_del(&adp->list);
9732 static void nft_set_commit_update(struct list_head *set_update_list)
9734 struct nft_set *set, *next;
9736 list_for_each_entry_safe(set, next, set_update_list, pending_update) {
9737 list_del_init(&set->pending_update);
9739 if (!set->ops->commit)
9742 set->ops->commit(set);
9746 static unsigned int nft_gc_seq_begin(struct nftables_pernet *nft_net)
9748 unsigned int gc_seq;
9750 /* Bump gc counter, it becomes odd, this is the busy mark. */
9751 gc_seq = READ_ONCE(nft_net->gc_seq);
9752 WRITE_ONCE(nft_net->gc_seq, ++gc_seq);
9757 static void nft_gc_seq_end(struct nftables_pernet *nft_net, unsigned int gc_seq)
9759 WRITE_ONCE(nft_net->gc_seq, ++gc_seq);
9762 static int nf_tables_commit(struct net *net, struct sk_buff *skb)
9764 struct nftables_pernet *nft_net = nft_pernet(net);
9765 struct nft_trans *trans, *next;
9766 unsigned int base_seq, gc_seq;
9767 LIST_HEAD(set_update_list);
9768 struct nft_trans_elem *te;
9769 struct nft_chain *chain;
9770 struct nft_table *table;
9774 if (list_empty(&nft_net->commit_list)) {
9775 mutex_unlock(&nft_net->commit_mutex);
9779 list_for_each_entry(trans, &nft_net->binding_list, binding_list) {
9780 switch (trans->msg_type) {
9781 case NFT_MSG_NEWSET:
9782 if (!nft_trans_set_update(trans) &&
9783 nft_set_is_anonymous(nft_trans_set(trans)) &&
9784 !nft_trans_set_bound(trans)) {
9785 pr_warn_once("nftables ruleset with unbound set\n");
9789 case NFT_MSG_NEWCHAIN:
9790 if (!nft_trans_chain_update(trans) &&
9791 nft_chain_binding(nft_trans_chain(trans)) &&
9792 !nft_trans_chain_bound(trans)) {
9793 pr_warn_once("nftables ruleset with unbound chain\n");
9800 /* 0. Validate ruleset, otherwise roll back for error reporting. */
9801 if (nf_tables_validate(net) < 0) {
9802 nft_net->validate_state = NFT_VALIDATE_DO;
9806 err = nft_flow_rule_offload_commit(net);
9810 /* 1. Allocate space for next generation rules_gen_X[] */
9811 list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
9814 ret = nf_tables_commit_audit_alloc(&adl, trans->ctx.table);
9816 nf_tables_commit_chain_prepare_cancel(net);
9817 nf_tables_commit_audit_free(&adl);
9820 if (trans->msg_type == NFT_MSG_NEWRULE ||
9821 trans->msg_type == NFT_MSG_DELRULE) {
9822 chain = trans->ctx.chain;
9824 ret = nf_tables_commit_chain_prepare(net, chain);
9826 nf_tables_commit_chain_prepare_cancel(net);
9827 nf_tables_commit_audit_free(&adl);
9833 /* step 2. Make rules_gen_X visible to packet path */
9834 list_for_each_entry(table, &nft_net->tables, list) {
9835 list_for_each_entry(chain, &table->chains, list)
9836 nf_tables_commit_chain(net, chain);
9840 * Bump generation counter, invalidate any dump in progress.
9841 * Cannot fail after this point.
9843 base_seq = READ_ONCE(nft_net->base_seq);
9844 while (++base_seq == 0)
9847 WRITE_ONCE(nft_net->base_seq, base_seq);
9849 gc_seq = nft_gc_seq_begin(nft_net);
9851 /* step 3. Start new generation, rules_gen_X now in use. */
9852 net->nft.gencursor = nft_gencursor_next(net);
9854 list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
9855 nf_tables_commit_audit_collect(&adl, trans->ctx.table,
9857 switch (trans->msg_type) {
9858 case NFT_MSG_NEWTABLE:
9859 if (nft_trans_table_update(trans)) {
9860 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
9861 nft_trans_destroy(trans);
9864 if (trans->ctx.table->flags & NFT_TABLE_F_DORMANT)
9865 nf_tables_table_disable(net, trans->ctx.table);
9867 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
9869 nft_clear(net, trans->ctx.table);
9871 nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
9872 nft_trans_destroy(trans);
9874 case NFT_MSG_DELTABLE:
9875 case NFT_MSG_DESTROYTABLE:
9876 list_del_rcu(&trans->ctx.table->list);
9877 nf_tables_table_notify(&trans->ctx, trans->msg_type);
9879 case NFT_MSG_NEWCHAIN:
9880 if (nft_trans_chain_update(trans)) {
9881 nft_chain_commit_update(trans);
9882 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN,
9883 &nft_trans_chain_hooks(trans));
9884 list_splice(&nft_trans_chain_hooks(trans),
9885 &nft_trans_basechain(trans)->hook_list);
9886 /* trans destroyed after rcu grace period */
9888 nft_chain_commit_drop_policy(trans);
9889 nft_clear(net, trans->ctx.chain);
9890 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN, NULL);
9891 nft_trans_destroy(trans);
9894 case NFT_MSG_DELCHAIN:
9895 case NFT_MSG_DESTROYCHAIN:
9896 if (nft_trans_chain_update(trans)) {
9897 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN,
9898 &nft_trans_chain_hooks(trans));
9899 nft_netdev_unregister_hooks(net,
9900 &nft_trans_chain_hooks(trans),
9903 nft_chain_del(trans->ctx.chain);
9904 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN,
9906 nf_tables_unregister_hook(trans->ctx.net,
9911 case NFT_MSG_NEWRULE:
9912 nft_clear(trans->ctx.net, nft_trans_rule(trans));
9913 nf_tables_rule_notify(&trans->ctx,
9914 nft_trans_rule(trans),
9916 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
9917 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
9919 nft_trans_destroy(trans);
9921 case NFT_MSG_DELRULE:
9922 case NFT_MSG_DESTROYRULE:
9923 list_del_rcu(&nft_trans_rule(trans)->list);
9924 nf_tables_rule_notify(&trans->ctx,
9925 nft_trans_rule(trans),
9927 nft_rule_expr_deactivate(&trans->ctx,
9928 nft_trans_rule(trans),
9931 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
9932 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
9934 case NFT_MSG_NEWSET:
9935 if (nft_trans_set_update(trans)) {
9936 struct nft_set *set = nft_trans_set(trans);
9938 WRITE_ONCE(set->timeout, nft_trans_set_timeout(trans));
9939 WRITE_ONCE(set->gc_int, nft_trans_set_gc_int(trans));
9941 if (nft_trans_set_size(trans))
9942 WRITE_ONCE(set->size, nft_trans_set_size(trans));
9944 nft_clear(net, nft_trans_set(trans));
9945 /* This avoids hitting -EBUSY when deleting the table
9946 * from the transaction.
9948 if (nft_set_is_anonymous(nft_trans_set(trans)) &&
9949 !list_empty(&nft_trans_set(trans)->bindings))
9950 nft_use_dec(&trans->ctx.table->use);
9952 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
9953 NFT_MSG_NEWSET, GFP_KERNEL);
9954 nft_trans_destroy(trans);
9956 case NFT_MSG_DELSET:
9957 case NFT_MSG_DESTROYSET:
9958 nft_trans_set(trans)->dead = 1;
9959 list_del_rcu(&nft_trans_set(trans)->list);
9960 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
9961 trans->msg_type, GFP_KERNEL);
9963 case NFT_MSG_NEWSETELEM:
9964 te = (struct nft_trans_elem *)trans->data;
9966 nft_setelem_activate(net, te->set, &te->elem);
9967 nf_tables_setelem_notify(&trans->ctx, te->set,
9969 NFT_MSG_NEWSETELEM);
9970 if (te->set->ops->commit &&
9971 list_empty(&te->set->pending_update)) {
9972 list_add_tail(&te->set->pending_update,
9975 nft_trans_destroy(trans);
9977 case NFT_MSG_DELSETELEM:
9978 case NFT_MSG_DESTROYSETELEM:
9979 te = (struct nft_trans_elem *)trans->data;
9981 nf_tables_setelem_notify(&trans->ctx, te->set,
9984 nft_setelem_remove(net, te->set, &te->elem);
9985 if (!nft_setelem_is_catchall(te->set, &te->elem)) {
9986 atomic_dec(&te->set->nelems);
9989 if (te->set->ops->commit &&
9990 list_empty(&te->set->pending_update)) {
9991 list_add_tail(&te->set->pending_update,
9995 case NFT_MSG_NEWOBJ:
9996 if (nft_trans_obj_update(trans)) {
9997 nft_obj_commit_update(trans);
9998 nf_tables_obj_notify(&trans->ctx,
9999 nft_trans_obj(trans),
10002 nft_clear(net, nft_trans_obj(trans));
10003 nf_tables_obj_notify(&trans->ctx,
10004 nft_trans_obj(trans),
10006 nft_trans_destroy(trans);
10009 case NFT_MSG_DELOBJ:
10010 case NFT_MSG_DESTROYOBJ:
10011 nft_obj_del(nft_trans_obj(trans));
10012 nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
10015 case NFT_MSG_NEWFLOWTABLE:
10016 if (nft_trans_flowtable_update(trans)) {
10017 nft_trans_flowtable(trans)->data.flags =
10018 nft_trans_flowtable_flags(trans);
10019 nf_tables_flowtable_notify(&trans->ctx,
10020 nft_trans_flowtable(trans),
10021 &nft_trans_flowtable_hooks(trans),
10022 NFT_MSG_NEWFLOWTABLE);
10023 list_splice(&nft_trans_flowtable_hooks(trans),
10024 &nft_trans_flowtable(trans)->hook_list);
10026 nft_clear(net, nft_trans_flowtable(trans));
10027 nf_tables_flowtable_notify(&trans->ctx,
10028 nft_trans_flowtable(trans),
10030 NFT_MSG_NEWFLOWTABLE);
10032 nft_trans_destroy(trans);
10034 case NFT_MSG_DELFLOWTABLE:
10035 case NFT_MSG_DESTROYFLOWTABLE:
10036 if (nft_trans_flowtable_update(trans)) {
10037 nf_tables_flowtable_notify(&trans->ctx,
10038 nft_trans_flowtable(trans),
10039 &nft_trans_flowtable_hooks(trans),
10041 nft_unregister_flowtable_net_hooks(net,
10042 &nft_trans_flowtable_hooks(trans));
10044 list_del_rcu(&nft_trans_flowtable(trans)->list);
10045 nf_tables_flowtable_notify(&trans->ctx,
10046 nft_trans_flowtable(trans),
10049 nft_unregister_flowtable_net_hooks(net,
10050 &nft_trans_flowtable(trans)->hook_list);
10056 nft_set_commit_update(&set_update_list);
10058 nft_commit_notify(net, NETLINK_CB(skb).portid);
10059 nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
10060 nf_tables_commit_audit_log(&adl, nft_net->base_seq);
10062 nft_gc_seq_end(nft_net, gc_seq);
10063 nft_net->validate_state = NFT_VALIDATE_SKIP;
10064 nf_tables_commit_release(net);
10069 static void nf_tables_module_autoload(struct net *net)
10071 struct nftables_pernet *nft_net = nft_pernet(net);
10072 struct nft_module_request *req, *next;
10073 LIST_HEAD(module_list);
10075 list_splice_init(&nft_net->module_list, &module_list);
10076 mutex_unlock(&nft_net->commit_mutex);
10077 list_for_each_entry_safe(req, next, &module_list, list) {
10078 request_module("%s", req->module);
10081 mutex_lock(&nft_net->commit_mutex);
10082 list_splice(&module_list, &nft_net->module_list);
10085 static void nf_tables_abort_release(struct nft_trans *trans)
10087 switch (trans->msg_type) {
10088 case NFT_MSG_NEWTABLE:
10089 nf_tables_table_destroy(&trans->ctx);
10091 case NFT_MSG_NEWCHAIN:
10092 if (nft_trans_chain_update(trans))
10093 nft_hooks_destroy(&nft_trans_chain_hooks(trans));
10095 nf_tables_chain_destroy(&trans->ctx);
10097 case NFT_MSG_NEWRULE:
10098 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
10100 case NFT_MSG_NEWSET:
10101 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
10103 case NFT_MSG_NEWSETELEM:
10104 nft_set_elem_destroy(nft_trans_elem_set(trans),
10105 nft_trans_elem(trans).priv, true);
10107 case NFT_MSG_NEWOBJ:
10108 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
10110 case NFT_MSG_NEWFLOWTABLE:
10111 if (nft_trans_flowtable_update(trans))
10112 nft_hooks_destroy(&nft_trans_flowtable_hooks(trans));
10114 nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
10120 static void nft_set_abort_update(struct list_head *set_update_list)
10122 struct nft_set *set, *next;
10124 list_for_each_entry_safe(set, next, set_update_list, pending_update) {
10125 list_del_init(&set->pending_update);
10127 if (!set->ops->abort)
10130 set->ops->abort(set);
10134 static int __nf_tables_abort(struct net *net, enum nfnl_abort_action action)
10136 struct nftables_pernet *nft_net = nft_pernet(net);
10137 struct nft_trans *trans, *next;
10138 LIST_HEAD(set_update_list);
10139 struct nft_trans_elem *te;
10141 if (action == NFNL_ABORT_VALIDATE &&
10142 nf_tables_validate(net) < 0)
10145 list_for_each_entry_safe_reverse(trans, next, &nft_net->commit_list,
10147 switch (trans->msg_type) {
10148 case NFT_MSG_NEWTABLE:
10149 if (nft_trans_table_update(trans)) {
10150 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
10151 nft_trans_destroy(trans);
10154 if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_DORMANT) {
10155 nf_tables_table_disable(net, trans->ctx.table);
10156 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
10157 } else if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_AWAKEN) {
10158 trans->ctx.table->flags &= ~NFT_TABLE_F_DORMANT;
10160 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
10161 nft_trans_destroy(trans);
10163 list_del_rcu(&trans->ctx.table->list);
10166 case NFT_MSG_DELTABLE:
10167 case NFT_MSG_DESTROYTABLE:
10168 nft_clear(trans->ctx.net, trans->ctx.table);
10169 nft_trans_destroy(trans);
10171 case NFT_MSG_NEWCHAIN:
10172 if (nft_trans_chain_update(trans)) {
10173 nft_netdev_unregister_hooks(net,
10174 &nft_trans_chain_hooks(trans),
10176 free_percpu(nft_trans_chain_stats(trans));
10177 kfree(nft_trans_chain_name(trans));
10178 nft_trans_destroy(trans);
10180 if (nft_trans_chain_bound(trans)) {
10181 nft_trans_destroy(trans);
10184 nft_use_dec_restore(&trans->ctx.table->use);
10185 nft_chain_del(trans->ctx.chain);
10186 nf_tables_unregister_hook(trans->ctx.net,
10191 case NFT_MSG_DELCHAIN:
10192 case NFT_MSG_DESTROYCHAIN:
10193 if (nft_trans_chain_update(trans)) {
10194 list_splice(&nft_trans_chain_hooks(trans),
10195 &nft_trans_basechain(trans)->hook_list);
10197 nft_use_inc_restore(&trans->ctx.table->use);
10198 nft_clear(trans->ctx.net, trans->ctx.chain);
10200 nft_trans_destroy(trans);
10202 case NFT_MSG_NEWRULE:
10203 if (nft_trans_rule_bound(trans)) {
10204 nft_trans_destroy(trans);
10207 nft_use_dec_restore(&trans->ctx.chain->use);
10208 list_del_rcu(&nft_trans_rule(trans)->list);
10209 nft_rule_expr_deactivate(&trans->ctx,
10210 nft_trans_rule(trans),
10212 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
10213 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
10215 case NFT_MSG_DELRULE:
10216 case NFT_MSG_DESTROYRULE:
10217 nft_use_inc_restore(&trans->ctx.chain->use);
10218 nft_clear(trans->ctx.net, nft_trans_rule(trans));
10219 nft_rule_expr_activate(&trans->ctx, nft_trans_rule(trans));
10220 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
10221 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
10223 nft_trans_destroy(trans);
10225 case NFT_MSG_NEWSET:
10226 if (nft_trans_set_update(trans)) {
10227 nft_trans_destroy(trans);
10230 nft_use_dec_restore(&trans->ctx.table->use);
10231 if (nft_trans_set_bound(trans)) {
10232 nft_trans_destroy(trans);
10235 list_del_rcu(&nft_trans_set(trans)->list);
10237 case NFT_MSG_DELSET:
10238 case NFT_MSG_DESTROYSET:
10239 nft_use_inc_restore(&trans->ctx.table->use);
10240 nft_clear(trans->ctx.net, nft_trans_set(trans));
10241 if (nft_trans_set(trans)->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
10242 nft_map_activate(&trans->ctx, nft_trans_set(trans));
10244 nft_trans_destroy(trans);
10246 case NFT_MSG_NEWSETELEM:
10247 if (nft_trans_elem_set_bound(trans)) {
10248 nft_trans_destroy(trans);
10251 te = (struct nft_trans_elem *)trans->data;
10252 nft_setelem_remove(net, te->set, &te->elem);
10253 if (!nft_setelem_is_catchall(te->set, &te->elem))
10254 atomic_dec(&te->set->nelems);
10256 if (te->set->ops->abort &&
10257 list_empty(&te->set->pending_update)) {
10258 list_add_tail(&te->set->pending_update,
10262 case NFT_MSG_DELSETELEM:
10263 case NFT_MSG_DESTROYSETELEM:
10264 te = (struct nft_trans_elem *)trans->data;
10266 nft_setelem_data_activate(net, te->set, &te->elem);
10267 nft_setelem_activate(net, te->set, &te->elem);
10268 if (!nft_setelem_is_catchall(te->set, &te->elem))
10271 if (te->set->ops->abort &&
10272 list_empty(&te->set->pending_update)) {
10273 list_add_tail(&te->set->pending_update,
10276 nft_trans_destroy(trans);
10278 case NFT_MSG_NEWOBJ:
10279 if (nft_trans_obj_update(trans)) {
10280 nft_obj_destroy(&trans->ctx, nft_trans_obj_newobj(trans));
10281 nft_trans_destroy(trans);
10283 nft_use_dec_restore(&trans->ctx.table->use);
10284 nft_obj_del(nft_trans_obj(trans));
10287 case NFT_MSG_DELOBJ:
10288 case NFT_MSG_DESTROYOBJ:
10289 nft_use_inc_restore(&trans->ctx.table->use);
10290 nft_clear(trans->ctx.net, nft_trans_obj(trans));
10291 nft_trans_destroy(trans);
10293 case NFT_MSG_NEWFLOWTABLE:
10294 if (nft_trans_flowtable_update(trans)) {
10295 nft_unregister_flowtable_net_hooks(net,
10296 &nft_trans_flowtable_hooks(trans));
10298 nft_use_dec_restore(&trans->ctx.table->use);
10299 list_del_rcu(&nft_trans_flowtable(trans)->list);
10300 nft_unregister_flowtable_net_hooks(net,
10301 &nft_trans_flowtable(trans)->hook_list);
10304 case NFT_MSG_DELFLOWTABLE:
10305 case NFT_MSG_DESTROYFLOWTABLE:
10306 if (nft_trans_flowtable_update(trans)) {
10307 list_splice(&nft_trans_flowtable_hooks(trans),
10308 &nft_trans_flowtable(trans)->hook_list);
10310 nft_use_inc_restore(&trans->ctx.table->use);
10311 nft_clear(trans->ctx.net, nft_trans_flowtable(trans));
10313 nft_trans_destroy(trans);
10318 nft_set_abort_update(&set_update_list);
10322 list_for_each_entry_safe_reverse(trans, next,
10323 &nft_net->commit_list, list) {
10324 nft_trans_list_del(trans);
10325 nf_tables_abort_release(trans);
10328 if (action == NFNL_ABORT_AUTOLOAD)
10329 nf_tables_module_autoload(net);
10331 nf_tables_module_autoload_cleanup(net);
10336 static int nf_tables_abort(struct net *net, struct sk_buff *skb,
10337 enum nfnl_abort_action action)
10339 struct nftables_pernet *nft_net = nft_pernet(net);
10340 unsigned int gc_seq;
10343 gc_seq = nft_gc_seq_begin(nft_net);
10344 ret = __nf_tables_abort(net, action);
10345 nft_gc_seq_end(nft_net, gc_seq);
10346 mutex_unlock(&nft_net->commit_mutex);
10351 static bool nf_tables_valid_genid(struct net *net, u32 genid)
10353 struct nftables_pernet *nft_net = nft_pernet(net);
10356 mutex_lock(&nft_net->commit_mutex);
10358 genid_ok = genid == 0 || nft_net->base_seq == genid;
10360 mutex_unlock(&nft_net->commit_mutex);
10362 /* else, commit mutex has to be released by commit or abort function */
10366 static const struct nfnetlink_subsystem nf_tables_subsys = {
10367 .name = "nf_tables",
10368 .subsys_id = NFNL_SUBSYS_NFTABLES,
10369 .cb_count = NFT_MSG_MAX,
10370 .cb = nf_tables_cb,
10371 .commit = nf_tables_commit,
10372 .abort = nf_tables_abort,
10373 .valid_genid = nf_tables_valid_genid,
10374 .owner = THIS_MODULE,
10377 int nft_chain_validate_dependency(const struct nft_chain *chain,
10378 enum nft_chain_types type)
10380 const struct nft_base_chain *basechain;
10382 if (nft_is_base_chain(chain)) {
10383 basechain = nft_base_chain(chain);
10384 if (basechain->type->type != type)
10385 return -EOPNOTSUPP;
10389 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
10391 int nft_chain_validate_hooks(const struct nft_chain *chain,
10392 unsigned int hook_flags)
10394 struct nft_base_chain *basechain;
10396 if (nft_is_base_chain(chain)) {
10397 basechain = nft_base_chain(chain);
10399 if ((1 << basechain->ops.hooknum) & hook_flags)
10402 return -EOPNOTSUPP;
10407 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
10410 * Loop detection - walk through the ruleset beginning at the destination chain
10411 * of a new jump until either the source chain is reached (loop) or all
10412 * reachable chains have been traversed.
10414 * The loop check is performed whenever a new jump verdict is added to an
10415 * expression or verdict map or a verdict map is bound to a new chain.
10418 static int nf_tables_check_loops(const struct nft_ctx *ctx,
10419 const struct nft_chain *chain);
10421 static int nft_check_loops(const struct nft_ctx *ctx,
10422 const struct nft_set_ext *ext)
10424 const struct nft_data *data;
10427 data = nft_set_ext_data(ext);
10428 switch (data->verdict.code) {
10431 ret = nf_tables_check_loops(ctx, data->verdict.chain);
10441 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
10442 struct nft_set *set,
10443 const struct nft_set_iter *iter,
10444 struct nft_set_elem *elem)
10446 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
10448 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
10449 *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
10452 return nft_check_loops(ctx, ext);
10455 static int nft_set_catchall_loops(const struct nft_ctx *ctx,
10456 struct nft_set *set)
10458 u8 genmask = nft_genmask_next(ctx->net);
10459 struct nft_set_elem_catchall *catchall;
10460 struct nft_set_ext *ext;
10463 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
10464 ext = nft_set_elem_ext(set, catchall->elem);
10465 if (!nft_set_elem_active(ext, genmask))
10468 ret = nft_check_loops(ctx, ext);
10476 static int nf_tables_check_loops(const struct nft_ctx *ctx,
10477 const struct nft_chain *chain)
10479 const struct nft_rule *rule;
10480 const struct nft_expr *expr, *last;
10481 struct nft_set *set;
10482 struct nft_set_binding *binding;
10483 struct nft_set_iter iter;
10485 if (ctx->chain == chain)
10488 list_for_each_entry(rule, &chain->rules, list) {
10489 nft_rule_for_each_expr(expr, last, rule) {
10490 struct nft_immediate_expr *priv;
10491 const struct nft_data *data;
10494 if (strcmp(expr->ops->type->name, "immediate"))
10497 priv = nft_expr_priv(expr);
10498 if (priv->dreg != NFT_REG_VERDICT)
10501 data = &priv->data;
10502 switch (data->verdict.code) {
10505 err = nf_tables_check_loops(ctx,
10506 data->verdict.chain);
10516 list_for_each_entry(set, &ctx->table->sets, list) {
10517 if (!nft_is_active_next(ctx->net, set))
10519 if (!(set->flags & NFT_SET_MAP) ||
10520 set->dtype != NFT_DATA_VERDICT)
10523 list_for_each_entry(binding, &set->bindings, list) {
10524 if (!(binding->flags & NFT_SET_MAP) ||
10525 binding->chain != chain)
10528 iter.genmask = nft_genmask_next(ctx->net);
10532 iter.fn = nf_tables_loop_check_setelem;
10534 set->ops->walk(ctx, set, &iter);
10536 iter.err = nft_set_catchall_loops(ctx, set);
10547 * nft_parse_u32_check - fetch u32 attribute and check for maximum value
10549 * @attr: netlink attribute to fetch value from
10550 * @max: maximum value to be stored in dest
10551 * @dest: pointer to the variable
10553 * Parse, check and store a given u32 netlink attribute into variable.
10554 * This function returns -ERANGE if the value goes over maximum value.
10555 * Otherwise a 0 is returned and the attribute value is stored in the
10556 * destination variable.
10558 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
10562 val = ntohl(nla_get_be32(attr));
10569 EXPORT_SYMBOL_GPL(nft_parse_u32_check);
10571 static int nft_parse_register(const struct nlattr *attr, u32 *preg)
10575 reg = ntohl(nla_get_be32(attr));
10577 case NFT_REG_VERDICT...NFT_REG_4:
10578 *preg = reg * NFT_REG_SIZE / NFT_REG32_SIZE;
10580 case NFT_REG32_00...NFT_REG32_15:
10581 *preg = reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
10591 * nft_dump_register - dump a register value to a netlink attribute
10593 * @skb: socket buffer
10594 * @attr: attribute number
10595 * @reg: register number
10597 * Construct a netlink attribute containing the register number. For
10598 * compatibility reasons, register numbers being a multiple of 4 are
10599 * translated to the corresponding 128 bit register numbers.
10601 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
10603 if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
10604 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
10606 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
10608 return nla_put_be32(skb, attr, htonl(reg));
10610 EXPORT_SYMBOL_GPL(nft_dump_register);
10612 static int nft_validate_register_load(enum nft_registers reg, unsigned int len)
10614 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
10618 if (reg * NFT_REG32_SIZE + len > sizeof_field(struct nft_regs, data))
10624 int nft_parse_register_load(const struct nlattr *attr, u8 *sreg, u32 len)
10629 err = nft_parse_register(attr, ®);
10633 err = nft_validate_register_load(reg, len);
10640 EXPORT_SYMBOL_GPL(nft_parse_register_load);
10642 static int nft_validate_register_store(const struct nft_ctx *ctx,
10643 enum nft_registers reg,
10644 const struct nft_data *data,
10645 enum nft_data_types type,
10651 case NFT_REG_VERDICT:
10652 if (type != NFT_DATA_VERDICT)
10655 if (data != NULL &&
10656 (data->verdict.code == NFT_GOTO ||
10657 data->verdict.code == NFT_JUMP)) {
10658 err = nf_tables_check_loops(ctx, data->verdict.chain);
10665 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
10669 if (reg * NFT_REG32_SIZE + len >
10670 sizeof_field(struct nft_regs, data))
10673 if (data != NULL && type != NFT_DATA_VALUE)
10679 int nft_parse_register_store(const struct nft_ctx *ctx,
10680 const struct nlattr *attr, u8 *dreg,
10681 const struct nft_data *data,
10682 enum nft_data_types type, unsigned int len)
10687 err = nft_parse_register(attr, ®);
10691 err = nft_validate_register_store(ctx, reg, data, type, len);
10698 EXPORT_SYMBOL_GPL(nft_parse_register_store);
10700 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
10701 [NFTA_VERDICT_CODE] = { .type = NLA_U32 },
10702 [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING,
10703 .len = NFT_CHAIN_MAXNAMELEN - 1 },
10704 [NFTA_VERDICT_CHAIN_ID] = { .type = NLA_U32 },
10707 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
10708 struct nft_data_desc *desc, const struct nlattr *nla)
10710 u8 genmask = nft_genmask_next(ctx->net);
10711 struct nlattr *tb[NFTA_VERDICT_MAX + 1];
10712 struct nft_chain *chain;
10715 err = nla_parse_nested_deprecated(tb, NFTA_VERDICT_MAX, nla,
10716 nft_verdict_policy, NULL);
10720 if (!tb[NFTA_VERDICT_CODE])
10723 /* zero padding hole for memcmp */
10724 memset(data, 0, sizeof(*data));
10725 data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
10727 switch (data->verdict.code) {
10729 switch (data->verdict.code & NF_VERDICT_MASK) {
10744 if (tb[NFTA_VERDICT_CHAIN]) {
10745 chain = nft_chain_lookup(ctx->net, ctx->table,
10746 tb[NFTA_VERDICT_CHAIN],
10748 } else if (tb[NFTA_VERDICT_CHAIN_ID]) {
10749 chain = nft_chain_lookup_byid(ctx->net, ctx->table,
10750 tb[NFTA_VERDICT_CHAIN_ID],
10753 return PTR_ERR(chain);
10759 return PTR_ERR(chain);
10760 if (nft_is_base_chain(chain))
10761 return -EOPNOTSUPP;
10762 if (nft_chain_is_bound(chain))
10764 if (desc->flags & NFT_DATA_DESC_SETELEM &&
10765 chain->flags & NFT_CHAIN_BINDING)
10767 if (!nft_use_inc(&chain->use))
10770 data->verdict.chain = chain;
10774 desc->len = sizeof(data->verdict);
10779 static void nft_verdict_uninit(const struct nft_data *data)
10781 struct nft_chain *chain;
10783 switch (data->verdict.code) {
10786 chain = data->verdict.chain;
10787 nft_use_dec(&chain->use);
10792 int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
10794 struct nlattr *nest;
10796 nest = nla_nest_start_noflag(skb, type);
10798 goto nla_put_failure;
10800 if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
10801 goto nla_put_failure;
10806 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
10808 goto nla_put_failure;
10810 nla_nest_end(skb, nest);
10817 static int nft_value_init(const struct nft_ctx *ctx,
10818 struct nft_data *data, struct nft_data_desc *desc,
10819 const struct nlattr *nla)
10823 len = nla_len(nla);
10826 if (len > desc->size)
10829 if (len != desc->len)
10835 nla_memcpy(data->data, nla, len);
10840 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
10843 return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
10846 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
10847 [NFTA_DATA_VALUE] = { .type = NLA_BINARY },
10848 [NFTA_DATA_VERDICT] = { .type = NLA_NESTED },
10852 * nft_data_init - parse nf_tables data netlink attributes
10854 * @ctx: context of the expression using the data
10855 * @data: destination struct nft_data
10856 * @desc: data description
10857 * @nla: netlink attribute containing data
10859 * Parse the netlink data attributes and initialize a struct nft_data.
10860 * The type and length of data are returned in the data description.
10862 * The caller can indicate that it only wants to accept data of type
10863 * NFT_DATA_VALUE by passing NULL for the ctx argument.
10865 int nft_data_init(const struct nft_ctx *ctx, struct nft_data *data,
10866 struct nft_data_desc *desc, const struct nlattr *nla)
10868 struct nlattr *tb[NFTA_DATA_MAX + 1];
10871 if (WARN_ON_ONCE(!desc->size))
10874 err = nla_parse_nested_deprecated(tb, NFTA_DATA_MAX, nla,
10875 nft_data_policy, NULL);
10879 if (tb[NFTA_DATA_VALUE]) {
10880 if (desc->type != NFT_DATA_VALUE)
10883 err = nft_value_init(ctx, data, desc, tb[NFTA_DATA_VALUE]);
10884 } else if (tb[NFTA_DATA_VERDICT] && ctx != NULL) {
10885 if (desc->type != NFT_DATA_VERDICT)
10888 err = nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
10895 EXPORT_SYMBOL_GPL(nft_data_init);
10898 * nft_data_release - release a nft_data item
10900 * @data: struct nft_data to release
10901 * @type: type of data
10903 * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
10904 * all others need to be released by calling this function.
10906 void nft_data_release(const struct nft_data *data, enum nft_data_types type)
10908 if (type < NFT_DATA_VERDICT)
10911 case NFT_DATA_VERDICT:
10912 return nft_verdict_uninit(data);
10917 EXPORT_SYMBOL_GPL(nft_data_release);
10919 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
10920 enum nft_data_types type, unsigned int len)
10922 struct nlattr *nest;
10925 nest = nla_nest_start_noflag(skb, attr);
10930 case NFT_DATA_VALUE:
10931 err = nft_value_dump(skb, data, len);
10933 case NFT_DATA_VERDICT:
10934 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
10941 nla_nest_end(skb, nest);
10944 EXPORT_SYMBOL_GPL(nft_data_dump);
10946 int __nft_release_basechain(struct nft_ctx *ctx)
10948 struct nft_rule *rule, *nr;
10950 if (WARN_ON(!nft_is_base_chain(ctx->chain)))
10953 nf_tables_unregister_hook(ctx->net, ctx->chain->table, ctx->chain);
10954 list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
10955 list_del(&rule->list);
10956 nft_use_dec(&ctx->chain->use);
10957 nf_tables_rule_release(ctx, rule);
10959 nft_chain_del(ctx->chain);
10960 nft_use_dec(&ctx->table->use);
10961 nf_tables_chain_destroy(ctx);
10965 EXPORT_SYMBOL_GPL(__nft_release_basechain);
10967 static void __nft_release_hook(struct net *net, struct nft_table *table)
10969 struct nft_flowtable *flowtable;
10970 struct nft_chain *chain;
10972 list_for_each_entry(chain, &table->chains, list)
10973 __nf_tables_unregister_hook(net, table, chain, true);
10974 list_for_each_entry(flowtable, &table->flowtables, list)
10975 __nft_unregister_flowtable_net_hooks(net, &flowtable->hook_list,
10979 static void __nft_release_hooks(struct net *net)
10981 struct nftables_pernet *nft_net = nft_pernet(net);
10982 struct nft_table *table;
10984 list_for_each_entry(table, &nft_net->tables, list) {
10985 if (nft_table_has_owner(table))
10988 __nft_release_hook(net, table);
10992 static void __nft_release_table(struct net *net, struct nft_table *table)
10994 struct nft_flowtable *flowtable, *nf;
10995 struct nft_chain *chain, *nc;
10996 struct nft_object *obj, *ne;
10997 struct nft_rule *rule, *nr;
10998 struct nft_set *set, *ns;
10999 struct nft_ctx ctx = {
11001 .family = NFPROTO_NETDEV,
11004 ctx.family = table->family;
11006 list_for_each_entry(chain, &table->chains, list) {
11007 if (nft_chain_is_bound(chain))
11011 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
11012 list_del(&rule->list);
11013 nft_use_dec(&chain->use);
11014 nf_tables_rule_release(&ctx, rule);
11017 list_for_each_entry_safe(flowtable, nf, &table->flowtables, list) {
11018 list_del(&flowtable->list);
11019 nft_use_dec(&table->use);
11020 nf_tables_flowtable_destroy(flowtable);
11022 list_for_each_entry_safe(set, ns, &table->sets, list) {
11023 list_del(&set->list);
11024 nft_use_dec(&table->use);
11025 if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
11026 nft_map_deactivate(&ctx, set);
11028 nft_set_destroy(&ctx, set);
11030 list_for_each_entry_safe(obj, ne, &table->objects, list) {
11032 nft_use_dec(&table->use);
11033 nft_obj_destroy(&ctx, obj);
11035 list_for_each_entry_safe(chain, nc, &table->chains, list) {
11037 nft_chain_del(chain);
11038 nft_use_dec(&table->use);
11039 nf_tables_chain_destroy(&ctx);
11041 nf_tables_table_destroy(&ctx);
11044 static void __nft_release_tables(struct net *net)
11046 struct nftables_pernet *nft_net = nft_pernet(net);
11047 struct nft_table *table, *nt;
11049 list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
11050 if (nft_table_has_owner(table))
11053 list_del(&table->list);
11055 __nft_release_table(net, table);
11059 static int nft_rcv_nl_event(struct notifier_block *this, unsigned long event,
11062 struct nft_table *table, *to_delete[8];
11063 struct nftables_pernet *nft_net;
11064 struct netlink_notify *n = ptr;
11065 struct net *net = n->net;
11066 unsigned int deleted;
11067 bool restart = false;
11068 unsigned int gc_seq;
11070 if (event != NETLINK_URELEASE || n->protocol != NETLINK_NETFILTER)
11071 return NOTIFY_DONE;
11073 nft_net = nft_pernet(net);
11075 mutex_lock(&nft_net->commit_mutex);
11077 gc_seq = nft_gc_seq_begin(nft_net);
11079 if (!list_empty(&nf_tables_destroy_list))
11080 nf_tables_trans_destroy_flush_work();
11082 list_for_each_entry(table, &nft_net->tables, list) {
11083 if (nft_table_has_owner(table) &&
11084 n->portid == table->nlpid) {
11085 __nft_release_hook(net, table);
11086 list_del_rcu(&table->list);
11087 to_delete[deleted++] = table;
11088 if (deleted >= ARRAY_SIZE(to_delete))
11093 restart = deleted >= ARRAY_SIZE(to_delete);
11096 __nft_release_table(net, to_delete[--deleted]);
11101 nft_gc_seq_end(nft_net, gc_seq);
11103 mutex_unlock(&nft_net->commit_mutex);
11105 return NOTIFY_DONE;
11108 static struct notifier_block nft_nl_notifier = {
11109 .notifier_call = nft_rcv_nl_event,
11112 static int __net_init nf_tables_init_net(struct net *net)
11114 struct nftables_pernet *nft_net = nft_pernet(net);
11116 INIT_LIST_HEAD(&nft_net->tables);
11117 INIT_LIST_HEAD(&nft_net->commit_list);
11118 INIT_LIST_HEAD(&nft_net->binding_list);
11119 INIT_LIST_HEAD(&nft_net->module_list);
11120 INIT_LIST_HEAD(&nft_net->notify_list);
11121 mutex_init(&nft_net->commit_mutex);
11122 nft_net->base_seq = 1;
11123 nft_net->gc_seq = 0;
11124 nft_net->validate_state = NFT_VALIDATE_SKIP;
11129 static void __net_exit nf_tables_pre_exit_net(struct net *net)
11131 struct nftables_pernet *nft_net = nft_pernet(net);
11133 mutex_lock(&nft_net->commit_mutex);
11134 __nft_release_hooks(net);
11135 mutex_unlock(&nft_net->commit_mutex);
11138 static void __net_exit nf_tables_exit_net(struct net *net)
11140 struct nftables_pernet *nft_net = nft_pernet(net);
11141 unsigned int gc_seq;
11143 mutex_lock(&nft_net->commit_mutex);
11145 gc_seq = nft_gc_seq_begin(nft_net);
11147 if (!list_empty(&nft_net->commit_list) ||
11148 !list_empty(&nft_net->module_list))
11149 __nf_tables_abort(net, NFNL_ABORT_NONE);
11151 __nft_release_tables(net);
11153 nft_gc_seq_end(nft_net, gc_seq);
11155 mutex_unlock(&nft_net->commit_mutex);
11156 WARN_ON_ONCE(!list_empty(&nft_net->tables));
11157 WARN_ON_ONCE(!list_empty(&nft_net->module_list));
11158 WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
11161 static void nf_tables_exit_batch(struct list_head *net_exit_list)
11163 flush_work(&trans_gc_work);
11166 static struct pernet_operations nf_tables_net_ops = {
11167 .init = nf_tables_init_net,
11168 .pre_exit = nf_tables_pre_exit_net,
11169 .exit = nf_tables_exit_net,
11170 .exit_batch = nf_tables_exit_batch,
11171 .id = &nf_tables_net_id,
11172 .size = sizeof(struct nftables_pernet),
11175 static int __init nf_tables_module_init(void)
11179 err = register_pernet_subsys(&nf_tables_net_ops);
11183 err = nft_chain_filter_init();
11185 goto err_chain_filter;
11187 err = nf_tables_core_module_init();
11189 goto err_core_module;
11191 err = register_netdevice_notifier(&nf_tables_flowtable_notifier);
11193 goto err_netdev_notifier;
11195 err = rhltable_init(&nft_objname_ht, &nft_objname_ht_params);
11197 goto err_rht_objname;
11199 err = nft_offload_init();
11203 err = netlink_register_notifier(&nft_nl_notifier);
11205 goto err_netlink_notifier;
11208 err = nfnetlink_subsys_register(&nf_tables_subsys);
11210 goto err_nfnl_subsys;
11212 nft_chain_route_init();
11217 netlink_unregister_notifier(&nft_nl_notifier);
11218 err_netlink_notifier:
11219 nft_offload_exit();
11221 rhltable_destroy(&nft_objname_ht);
11223 unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
11224 err_netdev_notifier:
11225 nf_tables_core_module_exit();
11227 nft_chain_filter_fini();
11229 unregister_pernet_subsys(&nf_tables_net_ops);
11233 static void __exit nf_tables_module_exit(void)
11235 nfnetlink_subsys_unregister(&nf_tables_subsys);
11236 netlink_unregister_notifier(&nft_nl_notifier);
11237 nft_offload_exit();
11238 unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
11239 nft_chain_filter_fini();
11240 nft_chain_route_fini();
11241 unregister_pernet_subsys(&nf_tables_net_ops);
11242 cancel_work_sync(&trans_gc_work);
11243 cancel_work_sync(&trans_destroy_work);
11245 rhltable_destroy(&nft_objname_ht);
11246 nf_tables_core_module_exit();
11249 module_init(nf_tables_module_init);
11250 module_exit(nf_tables_module_exit);
11252 MODULE_LICENSE("GPL");
11253 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
11254 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);