1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (c) 2007-2009 Patrick McHardy <kaber@trash.net>
5 * Development of this code funded by Astaro AG (http://www.astaro.com/)
8 #include <linux/module.h>
9 #include <linux/init.h>
10 #include <linux/list.h>
11 #include <linux/skbuff.h>
12 #include <linux/netlink.h>
13 #include <linux/vmalloc.h>
14 #include <linux/rhashtable.h>
15 #include <linux/audit.h>
16 #include <linux/netfilter.h>
17 #include <linux/netfilter/nfnetlink.h>
18 #include <linux/netfilter/nf_tables.h>
19 #include <net/netfilter/nf_flow_table.h>
20 #include <net/netfilter/nf_tables_core.h>
21 #include <net/netfilter/nf_tables.h>
22 #include <net/netfilter/nf_tables_offload.h>
23 #include <net/net_namespace.h>
26 #define NFT_MODULE_AUTOLOAD_LIMIT (MODULE_NAME_LEN - sizeof("nft-expr-255-"))
28 unsigned int nf_tables_net_id __read_mostly;
30 static LIST_HEAD(nf_tables_expressions);
31 static LIST_HEAD(nf_tables_objects);
32 static LIST_HEAD(nf_tables_flowtables);
33 static LIST_HEAD(nf_tables_destroy_list);
34 static DEFINE_SPINLOCK(nf_tables_destroy_list_lock);
37 NFT_VALIDATE_SKIP = 0,
42 static struct rhltable nft_objname_ht;
44 static u32 nft_chain_hash(const void *data, u32 len, u32 seed);
45 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed);
46 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *, const void *);
48 static u32 nft_objname_hash(const void *data, u32 len, u32 seed);
49 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed);
50 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *, const void *);
52 static const struct rhashtable_params nft_chain_ht_params = {
53 .head_offset = offsetof(struct nft_chain, rhlhead),
54 .key_offset = offsetof(struct nft_chain, name),
55 .hashfn = nft_chain_hash,
56 .obj_hashfn = nft_chain_hash_obj,
57 .obj_cmpfn = nft_chain_hash_cmp,
58 .automatic_shrinking = true,
61 static const struct rhashtable_params nft_objname_ht_params = {
62 .head_offset = offsetof(struct nft_object, rhlhead),
63 .key_offset = offsetof(struct nft_object, key),
64 .hashfn = nft_objname_hash,
65 .obj_hashfn = nft_objname_hash_obj,
66 .obj_cmpfn = nft_objname_hash_cmp,
67 .automatic_shrinking = true,
70 struct nft_audit_data {
71 struct nft_table *table;
74 struct list_head list;
77 static const u8 nft2audit_op[NFT_MSG_MAX] = { // enum nf_tables_msg_types
78 [NFT_MSG_NEWTABLE] = AUDIT_NFT_OP_TABLE_REGISTER,
79 [NFT_MSG_GETTABLE] = AUDIT_NFT_OP_INVALID,
80 [NFT_MSG_DELTABLE] = AUDIT_NFT_OP_TABLE_UNREGISTER,
81 [NFT_MSG_NEWCHAIN] = AUDIT_NFT_OP_CHAIN_REGISTER,
82 [NFT_MSG_GETCHAIN] = AUDIT_NFT_OP_INVALID,
83 [NFT_MSG_DELCHAIN] = AUDIT_NFT_OP_CHAIN_UNREGISTER,
84 [NFT_MSG_NEWRULE] = AUDIT_NFT_OP_RULE_REGISTER,
85 [NFT_MSG_GETRULE] = AUDIT_NFT_OP_INVALID,
86 [NFT_MSG_DELRULE] = AUDIT_NFT_OP_RULE_UNREGISTER,
87 [NFT_MSG_NEWSET] = AUDIT_NFT_OP_SET_REGISTER,
88 [NFT_MSG_GETSET] = AUDIT_NFT_OP_INVALID,
89 [NFT_MSG_DELSET] = AUDIT_NFT_OP_SET_UNREGISTER,
90 [NFT_MSG_NEWSETELEM] = AUDIT_NFT_OP_SETELEM_REGISTER,
91 [NFT_MSG_GETSETELEM] = AUDIT_NFT_OP_INVALID,
92 [NFT_MSG_DELSETELEM] = AUDIT_NFT_OP_SETELEM_UNREGISTER,
93 [NFT_MSG_NEWGEN] = AUDIT_NFT_OP_GEN_REGISTER,
94 [NFT_MSG_GETGEN] = AUDIT_NFT_OP_INVALID,
95 [NFT_MSG_TRACE] = AUDIT_NFT_OP_INVALID,
96 [NFT_MSG_NEWOBJ] = AUDIT_NFT_OP_OBJ_REGISTER,
97 [NFT_MSG_GETOBJ] = AUDIT_NFT_OP_INVALID,
98 [NFT_MSG_DELOBJ] = AUDIT_NFT_OP_OBJ_UNREGISTER,
99 [NFT_MSG_GETOBJ_RESET] = AUDIT_NFT_OP_OBJ_RESET,
100 [NFT_MSG_NEWFLOWTABLE] = AUDIT_NFT_OP_FLOWTABLE_REGISTER,
101 [NFT_MSG_GETFLOWTABLE] = AUDIT_NFT_OP_INVALID,
102 [NFT_MSG_DELFLOWTABLE] = AUDIT_NFT_OP_FLOWTABLE_UNREGISTER,
105 static void nft_validate_state_update(struct nft_table *table, u8 new_validate_state)
107 switch (table->validate_state) {
108 case NFT_VALIDATE_SKIP:
109 WARN_ON_ONCE(new_validate_state == NFT_VALIDATE_DO);
111 case NFT_VALIDATE_NEED:
113 case NFT_VALIDATE_DO:
114 if (new_validate_state == NFT_VALIDATE_NEED)
118 table->validate_state = new_validate_state;
120 static void nf_tables_trans_destroy_work(struct work_struct *w);
121 static DECLARE_WORK(trans_destroy_work, nf_tables_trans_destroy_work);
123 static void nft_ctx_init(struct nft_ctx *ctx,
125 const struct sk_buff *skb,
126 const struct nlmsghdr *nlh,
128 struct nft_table *table,
129 struct nft_chain *chain,
130 const struct nlattr * const *nla)
133 ctx->family = family;
138 ctx->portid = NETLINK_CB(skb).portid;
139 ctx->report = nlmsg_report(nlh);
140 ctx->flags = nlh->nlmsg_flags;
141 ctx->seq = nlh->nlmsg_seq;
144 static struct nft_trans *nft_trans_alloc_gfp(const struct nft_ctx *ctx,
145 int msg_type, u32 size, gfp_t gfp)
147 struct nft_trans *trans;
149 trans = kzalloc(sizeof(struct nft_trans) + size, gfp);
153 INIT_LIST_HEAD(&trans->list);
154 INIT_LIST_HEAD(&trans->binding_list);
155 trans->msg_type = msg_type;
161 static struct nft_trans *nft_trans_alloc(const struct nft_ctx *ctx,
162 int msg_type, u32 size)
164 return nft_trans_alloc_gfp(ctx, msg_type, size, GFP_KERNEL);
167 static void nft_trans_list_del(struct nft_trans *trans)
169 list_del(&trans->list);
170 list_del(&trans->binding_list);
173 static void nft_trans_destroy(struct nft_trans *trans)
175 nft_trans_list_del(trans);
179 static void __nft_set_trans_bind(const struct nft_ctx *ctx, struct nft_set *set,
182 struct nftables_pernet *nft_net;
183 struct net *net = ctx->net;
184 struct nft_trans *trans;
186 if (!nft_set_is_anonymous(set))
189 nft_net = nft_pernet(net);
190 list_for_each_entry_reverse(trans, &nft_net->commit_list, list) {
191 switch (trans->msg_type) {
193 if (nft_trans_set(trans) == set)
194 nft_trans_set_bound(trans) = bind;
196 case NFT_MSG_NEWSETELEM:
197 if (nft_trans_elem_set(trans) == set)
198 nft_trans_elem_set_bound(trans) = bind;
204 static void nft_set_trans_bind(const struct nft_ctx *ctx, struct nft_set *set)
206 return __nft_set_trans_bind(ctx, set, true);
209 static void nft_set_trans_unbind(const struct nft_ctx *ctx, struct nft_set *set)
211 return __nft_set_trans_bind(ctx, set, false);
214 static void __nft_chain_trans_bind(const struct nft_ctx *ctx,
215 struct nft_chain *chain, bool bind)
217 struct nftables_pernet *nft_net;
218 struct net *net = ctx->net;
219 struct nft_trans *trans;
221 if (!nft_chain_binding(chain))
224 nft_net = nft_pernet(net);
225 list_for_each_entry_reverse(trans, &nft_net->commit_list, list) {
226 switch (trans->msg_type) {
227 case NFT_MSG_NEWCHAIN:
228 if (nft_trans_chain(trans) == chain)
229 nft_trans_chain_bound(trans) = bind;
231 case NFT_MSG_NEWRULE:
232 if (trans->ctx.chain == chain)
233 nft_trans_rule_bound(trans) = bind;
239 static void nft_chain_trans_bind(const struct nft_ctx *ctx,
240 struct nft_chain *chain)
242 __nft_chain_trans_bind(ctx, chain, true);
245 int nf_tables_bind_chain(const struct nft_ctx *ctx, struct nft_chain *chain)
247 if (!nft_chain_binding(chain))
250 if (nft_chain_binding(ctx->chain))
258 nft_chain_trans_bind(ctx, chain);
263 void nf_tables_unbind_chain(const struct nft_ctx *ctx, struct nft_chain *chain)
265 __nft_chain_trans_bind(ctx, chain, false);
268 static int nft_netdev_register_hooks(struct net *net,
269 struct list_head *hook_list)
271 struct nft_hook *hook;
275 list_for_each_entry(hook, hook_list, list) {
276 err = nf_register_net_hook(net, &hook->ops);
285 list_for_each_entry(hook, hook_list, list) {
289 nf_unregister_net_hook(net, &hook->ops);
294 static void nft_netdev_unregister_hooks(struct net *net,
295 struct list_head *hook_list,
298 struct nft_hook *hook, *next;
300 list_for_each_entry_safe(hook, next, hook_list, list) {
301 nf_unregister_net_hook(net, &hook->ops);
302 if (release_netdev) {
303 list_del(&hook->list);
304 kfree_rcu(hook, rcu);
309 static int nf_tables_register_hook(struct net *net,
310 const struct nft_table *table,
311 struct nft_chain *chain)
313 struct nft_base_chain *basechain;
314 const struct nf_hook_ops *ops;
316 if (table->flags & NFT_TABLE_F_DORMANT ||
317 !nft_is_base_chain(chain))
320 basechain = nft_base_chain(chain);
321 ops = &basechain->ops;
323 if (basechain->type->ops_register)
324 return basechain->type->ops_register(net, ops);
326 if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
327 return nft_netdev_register_hooks(net, &basechain->hook_list);
329 return nf_register_net_hook(net, &basechain->ops);
332 static void __nf_tables_unregister_hook(struct net *net,
333 const struct nft_table *table,
334 struct nft_chain *chain,
337 struct nft_base_chain *basechain;
338 const struct nf_hook_ops *ops;
340 if (table->flags & NFT_TABLE_F_DORMANT ||
341 !nft_is_base_chain(chain))
343 basechain = nft_base_chain(chain);
344 ops = &basechain->ops;
346 if (basechain->type->ops_unregister)
347 return basechain->type->ops_unregister(net, ops);
349 if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
350 nft_netdev_unregister_hooks(net, &basechain->hook_list,
353 nf_unregister_net_hook(net, &basechain->ops);
356 static void nf_tables_unregister_hook(struct net *net,
357 const struct nft_table *table,
358 struct nft_chain *chain)
360 return __nf_tables_unregister_hook(net, table, chain, false);
363 static void nft_trans_commit_list_add_tail(struct net *net, struct nft_trans *trans)
365 struct nftables_pernet *nft_net = nft_pernet(net);
367 switch (trans->msg_type) {
369 if (!nft_trans_set_update(trans) &&
370 nft_set_is_anonymous(nft_trans_set(trans)))
371 list_add_tail(&trans->binding_list, &nft_net->binding_list);
373 case NFT_MSG_NEWCHAIN:
374 if (!nft_trans_chain_update(trans) &&
375 nft_chain_binding(nft_trans_chain(trans)))
376 list_add_tail(&trans->binding_list, &nft_net->binding_list);
380 list_add_tail(&trans->list, &nft_net->commit_list);
383 static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type)
385 struct nft_trans *trans;
387 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table));
391 if (msg_type == NFT_MSG_NEWTABLE)
392 nft_activate_next(ctx->net, ctx->table);
394 nft_trans_commit_list_add_tail(ctx->net, trans);
398 static int nft_deltable(struct nft_ctx *ctx)
402 err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE);
406 nft_deactivate_next(ctx->net, ctx->table);
410 static struct nft_trans *nft_trans_chain_add(struct nft_ctx *ctx, int msg_type)
412 struct nft_trans *trans;
414 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain));
416 return ERR_PTR(-ENOMEM);
418 if (msg_type == NFT_MSG_NEWCHAIN) {
419 nft_activate_next(ctx->net, ctx->chain);
421 if (ctx->nla[NFTA_CHAIN_ID]) {
422 nft_trans_chain_id(trans) =
423 ntohl(nla_get_be32(ctx->nla[NFTA_CHAIN_ID]));
426 nft_trans_chain(trans) = ctx->chain;
427 nft_trans_commit_list_add_tail(ctx->net, trans);
432 static int nft_delchain(struct nft_ctx *ctx)
434 struct nft_trans *trans;
436 trans = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN);
438 return PTR_ERR(trans);
441 nft_deactivate_next(ctx->net, ctx->chain);
446 void nft_rule_expr_activate(const struct nft_ctx *ctx, struct nft_rule *rule)
448 struct nft_expr *expr;
450 expr = nft_expr_first(rule);
451 while (nft_expr_more(rule, expr)) {
452 if (expr->ops->activate)
453 expr->ops->activate(ctx, expr);
455 expr = nft_expr_next(expr);
459 void nft_rule_expr_deactivate(const struct nft_ctx *ctx, struct nft_rule *rule,
460 enum nft_trans_phase phase)
462 struct nft_expr *expr;
464 expr = nft_expr_first(rule);
465 while (nft_expr_more(rule, expr)) {
466 if (expr->ops->deactivate)
467 expr->ops->deactivate(ctx, expr, phase);
469 expr = nft_expr_next(expr);
474 nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule)
476 /* You cannot delete the same rule twice */
477 if (nft_is_active_next(ctx->net, rule)) {
478 nft_deactivate_next(ctx->net, rule);
485 static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type,
486 struct nft_rule *rule)
488 struct nft_trans *trans;
490 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule));
494 if (msg_type == NFT_MSG_NEWRULE && ctx->nla[NFTA_RULE_ID] != NULL) {
495 nft_trans_rule_id(trans) =
496 ntohl(nla_get_be32(ctx->nla[NFTA_RULE_ID]));
498 nft_trans_rule(trans) = rule;
499 nft_trans_commit_list_add_tail(ctx->net, trans);
504 static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule)
506 struct nft_flow_rule *flow;
507 struct nft_trans *trans;
510 trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule);
514 if (ctx->chain->flags & NFT_CHAIN_HW_OFFLOAD) {
515 flow = nft_flow_rule_create(ctx->net, rule);
517 nft_trans_destroy(trans);
518 return PTR_ERR(flow);
521 nft_trans_flow_rule(trans) = flow;
524 err = nf_tables_delrule_deactivate(ctx, rule);
526 nft_trans_destroy(trans);
529 nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_PREPARE);
534 static int nft_delrule_by_chain(struct nft_ctx *ctx)
536 struct nft_rule *rule;
539 list_for_each_entry(rule, &ctx->chain->rules, list) {
540 if (!nft_is_active_next(ctx->net, rule))
543 err = nft_delrule(ctx, rule);
550 static int __nft_trans_set_add(const struct nft_ctx *ctx, int msg_type,
552 const struct nft_set_desc *desc)
554 struct nft_trans *trans;
556 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
560 if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] && !desc) {
561 nft_trans_set_id(trans) =
562 ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
563 nft_activate_next(ctx->net, set);
565 nft_trans_set(trans) = set;
567 nft_trans_set_update(trans) = true;
568 nft_trans_set_gc_int(trans) = desc->gc_int;
569 nft_trans_set_timeout(trans) = desc->timeout;
570 nft_trans_set_size(trans) = desc->size;
572 nft_trans_commit_list_add_tail(ctx->net, trans);
577 static int nft_trans_set_add(const struct nft_ctx *ctx, int msg_type,
580 return __nft_trans_set_add(ctx, msg_type, set, NULL);
583 static void nft_setelem_data_deactivate(const struct net *net,
584 const struct nft_set *set,
585 struct nft_set_elem *elem);
587 static int nft_mapelem_deactivate(const struct nft_ctx *ctx,
589 const struct nft_set_iter *iter,
590 struct nft_set_elem *elem)
592 nft_setelem_data_deactivate(ctx->net, set, elem);
597 struct nft_set_elem_catchall {
598 struct list_head list;
603 static void nft_map_catchall_deactivate(const struct nft_ctx *ctx,
606 u8 genmask = nft_genmask_next(ctx->net);
607 struct nft_set_elem_catchall *catchall;
608 struct nft_set_elem elem;
609 struct nft_set_ext *ext;
611 list_for_each_entry(catchall, &set->catchall_list, list) {
612 ext = nft_set_elem_ext(set, catchall->elem);
613 if (!nft_set_elem_active(ext, genmask))
616 elem.priv = catchall->elem;
617 nft_setelem_data_deactivate(ctx->net, set, &elem);
622 static void nft_map_deactivate(const struct nft_ctx *ctx, struct nft_set *set)
624 struct nft_set_iter iter = {
625 .genmask = nft_genmask_next(ctx->net),
626 .fn = nft_mapelem_deactivate,
629 set->ops->walk(ctx, set, &iter);
630 WARN_ON_ONCE(iter.err);
632 nft_map_catchall_deactivate(ctx, set);
635 static int nft_delset(const struct nft_ctx *ctx, struct nft_set *set)
639 err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set);
643 if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
644 nft_map_deactivate(ctx, set);
646 nft_deactivate_next(ctx->net, set);
652 static int nft_trans_obj_add(struct nft_ctx *ctx, int msg_type,
653 struct nft_object *obj)
655 struct nft_trans *trans;
657 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_obj));
661 if (msg_type == NFT_MSG_NEWOBJ)
662 nft_activate_next(ctx->net, obj);
664 nft_trans_obj(trans) = obj;
665 nft_trans_commit_list_add_tail(ctx->net, trans);
670 static int nft_delobj(struct nft_ctx *ctx, struct nft_object *obj)
674 err = nft_trans_obj_add(ctx, NFT_MSG_DELOBJ, obj);
678 nft_deactivate_next(ctx->net, obj);
684 static int nft_trans_flowtable_add(struct nft_ctx *ctx, int msg_type,
685 struct nft_flowtable *flowtable)
687 struct nft_trans *trans;
689 trans = nft_trans_alloc(ctx, msg_type,
690 sizeof(struct nft_trans_flowtable));
694 if (msg_type == NFT_MSG_NEWFLOWTABLE)
695 nft_activate_next(ctx->net, flowtable);
697 INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
698 nft_trans_flowtable(trans) = flowtable;
699 nft_trans_commit_list_add_tail(ctx->net, trans);
704 static int nft_delflowtable(struct nft_ctx *ctx,
705 struct nft_flowtable *flowtable)
709 err = nft_trans_flowtable_add(ctx, NFT_MSG_DELFLOWTABLE, flowtable);
713 nft_deactivate_next(ctx->net, flowtable);
719 static void __nft_reg_track_clobber(struct nft_regs_track *track, u8 dreg)
723 for (i = track->regs[dreg].num_reg; i > 0; i--)
724 __nft_reg_track_cancel(track, dreg - i);
727 static void __nft_reg_track_update(struct nft_regs_track *track,
728 const struct nft_expr *expr,
731 track->regs[dreg].selector = expr;
732 track->regs[dreg].bitwise = NULL;
733 track->regs[dreg].num_reg = num_reg;
736 void nft_reg_track_update(struct nft_regs_track *track,
737 const struct nft_expr *expr, u8 dreg, u8 len)
739 unsigned int regcount;
742 __nft_reg_track_clobber(track, dreg);
744 regcount = DIV_ROUND_UP(len, NFT_REG32_SIZE);
745 for (i = 0; i < regcount; i++, dreg++)
746 __nft_reg_track_update(track, expr, dreg, i);
748 EXPORT_SYMBOL_GPL(nft_reg_track_update);
750 void nft_reg_track_cancel(struct nft_regs_track *track, u8 dreg, u8 len)
752 unsigned int regcount;
755 __nft_reg_track_clobber(track, dreg);
757 regcount = DIV_ROUND_UP(len, NFT_REG32_SIZE);
758 for (i = 0; i < regcount; i++, dreg++)
759 __nft_reg_track_cancel(track, dreg);
761 EXPORT_SYMBOL_GPL(nft_reg_track_cancel);
763 void __nft_reg_track_cancel(struct nft_regs_track *track, u8 dreg)
765 track->regs[dreg].selector = NULL;
766 track->regs[dreg].bitwise = NULL;
767 track->regs[dreg].num_reg = 0;
769 EXPORT_SYMBOL_GPL(__nft_reg_track_cancel);
775 static struct nft_table *nft_table_lookup(const struct net *net,
776 const struct nlattr *nla,
777 u8 family, u8 genmask, u32 nlpid)
779 struct nftables_pernet *nft_net;
780 struct nft_table *table;
783 return ERR_PTR(-EINVAL);
785 nft_net = nft_pernet(net);
786 list_for_each_entry_rcu(table, &nft_net->tables, list,
787 lockdep_is_held(&nft_net->commit_mutex)) {
788 if (!nla_strcmp(nla, table->name) &&
789 table->family == family &&
790 nft_active_genmask(table, genmask)) {
791 if (nft_table_has_owner(table) &&
792 nlpid && table->nlpid != nlpid)
793 return ERR_PTR(-EPERM);
799 return ERR_PTR(-ENOENT);
802 static struct nft_table *nft_table_lookup_byhandle(const struct net *net,
803 const struct nlattr *nla,
804 u8 genmask, u32 nlpid)
806 struct nftables_pernet *nft_net;
807 struct nft_table *table;
809 nft_net = nft_pernet(net);
810 list_for_each_entry(table, &nft_net->tables, list) {
811 if (be64_to_cpu(nla_get_be64(nla)) == table->handle &&
812 nft_active_genmask(table, genmask)) {
813 if (nft_table_has_owner(table) &&
814 nlpid && table->nlpid != nlpid)
815 return ERR_PTR(-EPERM);
821 return ERR_PTR(-ENOENT);
824 static inline u64 nf_tables_alloc_handle(struct nft_table *table)
826 return ++table->hgenerator;
829 static const struct nft_chain_type *chain_type[NFPROTO_NUMPROTO][NFT_CHAIN_T_MAX];
831 static const struct nft_chain_type *
832 __nft_chain_type_get(u8 family, enum nft_chain_types type)
834 if (family >= NFPROTO_NUMPROTO ||
835 type >= NFT_CHAIN_T_MAX)
838 return chain_type[family][type];
841 static const struct nft_chain_type *
842 __nf_tables_chain_type_lookup(const struct nlattr *nla, u8 family)
844 const struct nft_chain_type *type;
847 for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
848 type = __nft_chain_type_get(family, i);
851 if (!nla_strcmp(nla, type->name))
857 struct nft_module_request {
858 struct list_head list;
859 char module[MODULE_NAME_LEN];
863 #ifdef CONFIG_MODULES
864 __printf(2, 3) int nft_request_module(struct net *net, const char *fmt,
867 char module_name[MODULE_NAME_LEN];
868 struct nftables_pernet *nft_net;
869 struct nft_module_request *req;
874 ret = vsnprintf(module_name, MODULE_NAME_LEN, fmt, args);
876 if (ret >= MODULE_NAME_LEN)
879 nft_net = nft_pernet(net);
880 list_for_each_entry(req, &nft_net->module_list, list) {
881 if (!strcmp(req->module, module_name)) {
885 /* A request to load this module already exists. */
890 req = kmalloc(sizeof(*req), GFP_KERNEL);
895 strscpy(req->module, module_name, MODULE_NAME_LEN);
896 list_add_tail(&req->list, &nft_net->module_list);
900 EXPORT_SYMBOL_GPL(nft_request_module);
903 static void lockdep_nfnl_nft_mutex_not_held(void)
905 #ifdef CONFIG_PROVE_LOCKING
907 WARN_ON_ONCE(lockdep_nfnl_is_held(NFNL_SUBSYS_NFTABLES));
911 static const struct nft_chain_type *
912 nf_tables_chain_type_lookup(struct net *net, const struct nlattr *nla,
913 u8 family, bool autoload)
915 const struct nft_chain_type *type;
917 type = __nf_tables_chain_type_lookup(nla, family);
921 lockdep_nfnl_nft_mutex_not_held();
922 #ifdef CONFIG_MODULES
924 if (nft_request_module(net, "nft-chain-%u-%.*s", family,
926 (const char *)nla_data(nla)) == -EAGAIN)
927 return ERR_PTR(-EAGAIN);
930 return ERR_PTR(-ENOENT);
933 static __be16 nft_base_seq(const struct net *net)
935 struct nftables_pernet *nft_net = nft_pernet(net);
937 return htons(nft_net->base_seq & 0xffff);
940 static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
941 [NFTA_TABLE_NAME] = { .type = NLA_STRING,
942 .len = NFT_TABLE_MAXNAMELEN - 1 },
943 [NFTA_TABLE_FLAGS] = { .type = NLA_U32 },
944 [NFTA_TABLE_HANDLE] = { .type = NLA_U64 },
945 [NFTA_TABLE_USERDATA] = { .type = NLA_BINARY,
946 .len = NFT_USERDATA_MAXLEN }
949 static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
950 u32 portid, u32 seq, int event, u32 flags,
951 int family, const struct nft_table *table)
953 struct nlmsghdr *nlh;
955 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
956 nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
957 NFNETLINK_V0, nft_base_seq(net));
959 goto nla_put_failure;
961 if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
962 nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)) ||
963 nla_put_be64(skb, NFTA_TABLE_HANDLE, cpu_to_be64(table->handle),
965 goto nla_put_failure;
967 if (event == NFT_MSG_DELTABLE) {
972 if (nla_put_be32(skb, NFTA_TABLE_FLAGS,
973 htonl(table->flags & NFT_TABLE_F_MASK)))
974 goto nla_put_failure;
976 if (nft_table_has_owner(table) &&
977 nla_put_be32(skb, NFTA_TABLE_OWNER, htonl(table->nlpid)))
978 goto nla_put_failure;
981 if (nla_put(skb, NFTA_TABLE_USERDATA, table->udlen, table->udata))
982 goto nla_put_failure;
989 nlmsg_trim(skb, nlh);
993 struct nftnl_skb_parms {
996 #define NFT_CB(skb) (*(struct nftnl_skb_parms*)&((skb)->cb))
998 static void nft_notify_enqueue(struct sk_buff *skb, bool report,
999 struct list_head *notify_list)
1001 NFT_CB(skb).report = report;
1002 list_add_tail(&skb->list, notify_list);
1005 static void nf_tables_table_notify(const struct nft_ctx *ctx, int event)
1007 struct nftables_pernet *nft_net;
1008 struct sk_buff *skb;
1013 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1016 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1020 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
1021 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
1023 err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
1024 event, flags, ctx->family, ctx->table);
1030 nft_net = nft_pernet(ctx->net);
1031 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
1034 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
1037 static int nf_tables_dump_tables(struct sk_buff *skb,
1038 struct netlink_callback *cb)
1040 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1041 struct nftables_pernet *nft_net;
1042 const struct nft_table *table;
1043 unsigned int idx = 0, s_idx = cb->args[0];
1044 struct net *net = sock_net(skb->sk);
1045 int family = nfmsg->nfgen_family;
1048 nft_net = nft_pernet(net);
1049 cb->seq = READ_ONCE(nft_net->base_seq);
1051 list_for_each_entry_rcu(table, &nft_net->tables, list) {
1052 if (family != NFPROTO_UNSPEC && family != table->family)
1058 memset(&cb->args[1], 0,
1059 sizeof(cb->args) - sizeof(cb->args[0]));
1060 if (!nft_is_active(net, table))
1062 if (nf_tables_fill_table_info(skb, net,
1063 NETLINK_CB(cb->skb).portid,
1065 NFT_MSG_NEWTABLE, NLM_F_MULTI,
1066 table->family, table) < 0)
1069 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1079 static int nft_netlink_dump_start_rcu(struct sock *nlsk, struct sk_buff *skb,
1080 const struct nlmsghdr *nlh,
1081 struct netlink_dump_control *c)
1085 if (!try_module_get(THIS_MODULE))
1089 err = netlink_dump_start(nlsk, skb, nlh, c);
1091 module_put(THIS_MODULE);
1096 /* called with rcu_read_lock held */
1097 static int nf_tables_gettable(struct sk_buff *skb, const struct nfnl_info *info,
1098 const struct nlattr * const nla[])
1100 struct netlink_ext_ack *extack = info->extack;
1101 u8 genmask = nft_genmask_cur(info->net);
1102 u8 family = info->nfmsg->nfgen_family;
1103 const struct nft_table *table;
1104 struct net *net = info->net;
1105 struct sk_buff *skb2;
1108 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
1109 struct netlink_dump_control c = {
1110 .dump = nf_tables_dump_tables,
1111 .module = THIS_MODULE,
1114 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
1117 table = nft_table_lookup(net, nla[NFTA_TABLE_NAME], family, genmask, 0);
1118 if (IS_ERR(table)) {
1119 NL_SET_BAD_ATTR(extack, nla[NFTA_TABLE_NAME]);
1120 return PTR_ERR(table);
1123 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1127 err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
1128 info->nlh->nlmsg_seq, NFT_MSG_NEWTABLE,
1131 goto err_fill_table_info;
1133 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
1135 err_fill_table_info:
1140 static void nft_table_disable(struct net *net, struct nft_table *table, u32 cnt)
1142 struct nft_chain *chain;
1145 list_for_each_entry(chain, &table->chains, list) {
1146 if (!nft_is_active_next(net, chain))
1148 if (!nft_is_base_chain(chain))
1151 if (cnt && i++ == cnt)
1154 nf_tables_unregister_hook(net, table, chain);
1158 static int nf_tables_table_enable(struct net *net, struct nft_table *table)
1160 struct nft_chain *chain;
1163 list_for_each_entry(chain, &table->chains, list) {
1164 if (!nft_is_active_next(net, chain))
1166 if (!nft_is_base_chain(chain))
1169 err = nf_tables_register_hook(net, table, chain);
1171 goto err_register_hooks;
1179 nft_table_disable(net, table, i);
1183 static void nf_tables_table_disable(struct net *net, struct nft_table *table)
1185 table->flags &= ~NFT_TABLE_F_DORMANT;
1186 nft_table_disable(net, table, 0);
1187 table->flags |= NFT_TABLE_F_DORMANT;
1190 #define __NFT_TABLE_F_INTERNAL (NFT_TABLE_F_MASK + 1)
1191 #define __NFT_TABLE_F_WAS_DORMANT (__NFT_TABLE_F_INTERNAL << 0)
1192 #define __NFT_TABLE_F_WAS_AWAKEN (__NFT_TABLE_F_INTERNAL << 1)
1193 #define __NFT_TABLE_F_UPDATE (__NFT_TABLE_F_WAS_DORMANT | \
1194 __NFT_TABLE_F_WAS_AWAKEN)
1196 static int nf_tables_updtable(struct nft_ctx *ctx)
1198 struct nft_trans *trans;
1202 if (!ctx->nla[NFTA_TABLE_FLAGS])
1205 flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
1206 if (flags & ~NFT_TABLE_F_MASK)
1209 if (flags == ctx->table->flags)
1212 if ((nft_table_has_owner(ctx->table) &&
1213 !(flags & NFT_TABLE_F_OWNER)) ||
1214 (!nft_table_has_owner(ctx->table) &&
1215 flags & NFT_TABLE_F_OWNER))
1218 trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
1219 sizeof(struct nft_trans_table));
1223 if ((flags & NFT_TABLE_F_DORMANT) &&
1224 !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
1225 ctx->table->flags |= NFT_TABLE_F_DORMANT;
1226 if (!(ctx->table->flags & __NFT_TABLE_F_UPDATE))
1227 ctx->table->flags |= __NFT_TABLE_F_WAS_AWAKEN;
1228 } else if (!(flags & NFT_TABLE_F_DORMANT) &&
1229 ctx->table->flags & NFT_TABLE_F_DORMANT) {
1230 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
1231 if (!(ctx->table->flags & __NFT_TABLE_F_UPDATE)) {
1232 ret = nf_tables_table_enable(ctx->net, ctx->table);
1234 goto err_register_hooks;
1236 ctx->table->flags |= __NFT_TABLE_F_WAS_DORMANT;
1240 nft_trans_table_update(trans) = true;
1241 nft_trans_commit_list_add_tail(ctx->net, trans);
1246 nft_trans_destroy(trans);
1250 static u32 nft_chain_hash(const void *data, u32 len, u32 seed)
1252 const char *name = data;
1254 return jhash(name, strlen(name), seed);
1257 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed)
1259 const struct nft_chain *chain = data;
1261 return nft_chain_hash(chain->name, 0, seed);
1264 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *arg,
1267 const struct nft_chain *chain = ptr;
1268 const char *name = arg->key;
1270 return strcmp(chain->name, name);
1273 static u32 nft_objname_hash(const void *data, u32 len, u32 seed)
1275 const struct nft_object_hash_key *k = data;
1277 seed ^= hash_ptr(k->table, 32);
1279 return jhash(k->name, strlen(k->name), seed);
1282 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed)
1284 const struct nft_object *obj = data;
1286 return nft_objname_hash(&obj->key, 0, seed);
1289 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *arg,
1292 const struct nft_object_hash_key *k = arg->key;
1293 const struct nft_object *obj = ptr;
1295 if (obj->key.table != k->table)
1298 return strcmp(obj->key.name, k->name);
1301 static bool nft_supported_family(u8 family)
1304 #ifdef CONFIG_NF_TABLES_INET
1305 || family == NFPROTO_INET
1307 #ifdef CONFIG_NF_TABLES_IPV4
1308 || family == NFPROTO_IPV4
1310 #ifdef CONFIG_NF_TABLES_ARP
1311 || family == NFPROTO_ARP
1313 #ifdef CONFIG_NF_TABLES_NETDEV
1314 || family == NFPROTO_NETDEV
1316 #if IS_ENABLED(CONFIG_NF_TABLES_BRIDGE)
1317 || family == NFPROTO_BRIDGE
1319 #ifdef CONFIG_NF_TABLES_IPV6
1320 || family == NFPROTO_IPV6
1325 static int nf_tables_newtable(struct sk_buff *skb, const struct nfnl_info *info,
1326 const struct nlattr * const nla[])
1328 struct nftables_pernet *nft_net = nft_pernet(info->net);
1329 struct netlink_ext_ack *extack = info->extack;
1330 u8 genmask = nft_genmask_next(info->net);
1331 u8 family = info->nfmsg->nfgen_family;
1332 struct net *net = info->net;
1333 const struct nlattr *attr;
1334 struct nft_table *table;
1339 if (!nft_supported_family(family))
1342 lockdep_assert_held(&nft_net->commit_mutex);
1343 attr = nla[NFTA_TABLE_NAME];
1344 table = nft_table_lookup(net, attr, family, genmask,
1345 NETLINK_CB(skb).portid);
1346 if (IS_ERR(table)) {
1347 if (PTR_ERR(table) != -ENOENT)
1348 return PTR_ERR(table);
1350 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
1351 NL_SET_BAD_ATTR(extack, attr);
1354 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
1357 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
1359 return nf_tables_updtable(&ctx);
1362 if (nla[NFTA_TABLE_FLAGS]) {
1363 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
1364 if (flags & ~NFT_TABLE_F_MASK)
1369 table = kzalloc(sizeof(*table), GFP_KERNEL_ACCOUNT);
1373 table->validate_state = NFT_VALIDATE_SKIP;
1374 table->name = nla_strdup(attr, GFP_KERNEL_ACCOUNT);
1375 if (table->name == NULL)
1378 if (nla[NFTA_TABLE_USERDATA]) {
1379 table->udata = nla_memdup(nla[NFTA_TABLE_USERDATA], GFP_KERNEL_ACCOUNT);
1380 if (table->udata == NULL)
1381 goto err_table_udata;
1383 table->udlen = nla_len(nla[NFTA_TABLE_USERDATA]);
1386 err = rhltable_init(&table->chains_ht, &nft_chain_ht_params);
1390 INIT_LIST_HEAD(&table->chains);
1391 INIT_LIST_HEAD(&table->sets);
1392 INIT_LIST_HEAD(&table->objects);
1393 INIT_LIST_HEAD(&table->flowtables);
1394 table->family = family;
1395 table->flags = flags;
1396 table->handle = ++nft_net->table_handle;
1397 if (table->flags & NFT_TABLE_F_OWNER)
1398 table->nlpid = NETLINK_CB(skb).portid;
1400 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
1401 err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
1405 list_add_tail_rcu(&table->list, &nft_net->tables);
1408 rhltable_destroy(&table->chains_ht);
1410 kfree(table->udata);
1419 static int nft_flush_table(struct nft_ctx *ctx)
1421 struct nft_flowtable *flowtable, *nft;
1422 struct nft_chain *chain, *nc;
1423 struct nft_object *obj, *ne;
1424 struct nft_set *set, *ns;
1427 list_for_each_entry(chain, &ctx->table->chains, list) {
1428 if (!nft_is_active_next(ctx->net, chain))
1431 if (nft_chain_is_bound(chain))
1436 err = nft_delrule_by_chain(ctx);
1441 list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
1442 if (!nft_is_active_next(ctx->net, set))
1445 if (nft_set_is_anonymous(set) &&
1446 !list_empty(&set->bindings))
1449 err = nft_delset(ctx, set);
1454 list_for_each_entry_safe(flowtable, nft, &ctx->table->flowtables, list) {
1455 if (!nft_is_active_next(ctx->net, flowtable))
1458 err = nft_delflowtable(ctx, flowtable);
1463 list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) {
1464 if (!nft_is_active_next(ctx->net, obj))
1467 err = nft_delobj(ctx, obj);
1472 list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
1473 if (!nft_is_active_next(ctx->net, chain))
1476 if (nft_chain_is_bound(chain))
1481 err = nft_delchain(ctx);
1486 err = nft_deltable(ctx);
1491 static int nft_flush(struct nft_ctx *ctx, int family)
1493 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
1494 const struct nlattr * const *nla = ctx->nla;
1495 struct nft_table *table, *nt;
1498 list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
1499 if (family != AF_UNSPEC && table->family != family)
1502 ctx->family = table->family;
1504 if (!nft_is_active_next(ctx->net, table))
1507 if (nft_table_has_owner(table) && table->nlpid != ctx->portid)
1510 if (nla[NFTA_TABLE_NAME] &&
1511 nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
1516 err = nft_flush_table(ctx);
1524 static int nf_tables_deltable(struct sk_buff *skb, const struct nfnl_info *info,
1525 const struct nlattr * const nla[])
1527 struct netlink_ext_ack *extack = info->extack;
1528 u8 genmask = nft_genmask_next(info->net);
1529 u8 family = info->nfmsg->nfgen_family;
1530 struct net *net = info->net;
1531 const struct nlattr *attr;
1532 struct nft_table *table;
1535 nft_ctx_init(&ctx, net, skb, info->nlh, 0, NULL, NULL, nla);
1536 if (family == AF_UNSPEC ||
1537 (!nla[NFTA_TABLE_NAME] && !nla[NFTA_TABLE_HANDLE]))
1538 return nft_flush(&ctx, family);
1540 if (nla[NFTA_TABLE_HANDLE]) {
1541 attr = nla[NFTA_TABLE_HANDLE];
1542 table = nft_table_lookup_byhandle(net, attr, genmask,
1543 NETLINK_CB(skb).portid);
1545 attr = nla[NFTA_TABLE_NAME];
1546 table = nft_table_lookup(net, attr, family, genmask,
1547 NETLINK_CB(skb).portid);
1550 if (IS_ERR(table)) {
1551 if (PTR_ERR(table) == -ENOENT &&
1552 NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYTABLE)
1555 NL_SET_BAD_ATTR(extack, attr);
1556 return PTR_ERR(table);
1559 if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
1563 ctx.family = family;
1566 return nft_flush_table(&ctx);
1569 static void nf_tables_table_destroy(struct nft_ctx *ctx)
1571 if (WARN_ON(ctx->table->use > 0))
1574 rhltable_destroy(&ctx->table->chains_ht);
1575 kfree(ctx->table->name);
1576 kfree(ctx->table->udata);
1580 void nft_register_chain_type(const struct nft_chain_type *ctype)
1582 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1583 if (WARN_ON(__nft_chain_type_get(ctype->family, ctype->type))) {
1584 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1587 chain_type[ctype->family][ctype->type] = ctype;
1588 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1590 EXPORT_SYMBOL_GPL(nft_register_chain_type);
1592 void nft_unregister_chain_type(const struct nft_chain_type *ctype)
1594 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1595 chain_type[ctype->family][ctype->type] = NULL;
1596 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1598 EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
1604 static struct nft_chain *
1605 nft_chain_lookup_byhandle(const struct nft_table *table, u64 handle, u8 genmask)
1607 struct nft_chain *chain;
1609 list_for_each_entry(chain, &table->chains, list) {
1610 if (chain->handle == handle &&
1611 nft_active_genmask(chain, genmask))
1615 return ERR_PTR(-ENOENT);
1618 static bool lockdep_commit_lock_is_held(const struct net *net)
1620 #ifdef CONFIG_PROVE_LOCKING
1621 struct nftables_pernet *nft_net = nft_pernet(net);
1623 return lockdep_is_held(&nft_net->commit_mutex);
1629 static struct nft_chain *nft_chain_lookup(struct net *net,
1630 struct nft_table *table,
1631 const struct nlattr *nla, u8 genmask)
1633 char search[NFT_CHAIN_MAXNAMELEN + 1];
1634 struct rhlist_head *tmp, *list;
1635 struct nft_chain *chain;
1638 return ERR_PTR(-EINVAL);
1640 nla_strscpy(search, nla, sizeof(search));
1642 WARN_ON(!rcu_read_lock_held() &&
1643 !lockdep_commit_lock_is_held(net));
1645 chain = ERR_PTR(-ENOENT);
1647 list = rhltable_lookup(&table->chains_ht, search, nft_chain_ht_params);
1651 rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
1652 if (nft_active_genmask(chain, genmask))
1655 chain = ERR_PTR(-ENOENT);
1661 static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
1662 [NFTA_CHAIN_TABLE] = { .type = NLA_STRING,
1663 .len = NFT_TABLE_MAXNAMELEN - 1 },
1664 [NFTA_CHAIN_HANDLE] = { .type = NLA_U64 },
1665 [NFTA_CHAIN_NAME] = { .type = NLA_STRING,
1666 .len = NFT_CHAIN_MAXNAMELEN - 1 },
1667 [NFTA_CHAIN_HOOK] = { .type = NLA_NESTED },
1668 [NFTA_CHAIN_POLICY] = { .type = NLA_U32 },
1669 [NFTA_CHAIN_TYPE] = { .type = NLA_STRING,
1670 .len = NFT_MODULE_AUTOLOAD_LIMIT },
1671 [NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED },
1672 [NFTA_CHAIN_FLAGS] = { .type = NLA_U32 },
1673 [NFTA_CHAIN_ID] = { .type = NLA_U32 },
1674 [NFTA_CHAIN_USERDATA] = { .type = NLA_BINARY,
1675 .len = NFT_USERDATA_MAXLEN },
1678 static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
1679 [NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 },
1680 [NFTA_HOOK_PRIORITY] = { .type = NLA_U32 },
1681 [NFTA_HOOK_DEV] = { .type = NLA_STRING,
1682 .len = IFNAMSIZ - 1 },
1685 static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
1687 struct nft_stats *cpu_stats, total;
1688 struct nlattr *nest;
1696 memset(&total, 0, sizeof(total));
1697 for_each_possible_cpu(cpu) {
1698 cpu_stats = per_cpu_ptr(stats, cpu);
1700 seq = u64_stats_fetch_begin(&cpu_stats->syncp);
1701 pkts = cpu_stats->pkts;
1702 bytes = cpu_stats->bytes;
1703 } while (u64_stats_fetch_retry(&cpu_stats->syncp, seq));
1705 total.bytes += bytes;
1707 nest = nla_nest_start_noflag(skb, NFTA_CHAIN_COUNTERS);
1709 goto nla_put_failure;
1711 if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts),
1712 NFTA_COUNTER_PAD) ||
1713 nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
1715 goto nla_put_failure;
1717 nla_nest_end(skb, nest);
1724 static int nft_dump_basechain_hook(struct sk_buff *skb, int family,
1725 const struct nft_base_chain *basechain,
1726 const struct list_head *hook_list)
1728 const struct nf_hook_ops *ops = &basechain->ops;
1729 struct nft_hook *hook, *first = NULL;
1730 struct nlattr *nest, *nest_devs;
1733 nest = nla_nest_start_noflag(skb, NFTA_CHAIN_HOOK);
1735 goto nla_put_failure;
1736 if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
1737 goto nla_put_failure;
1738 if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
1739 goto nla_put_failure;
1741 if (nft_base_chain_netdev(family, ops->hooknum)) {
1742 nest_devs = nla_nest_start_noflag(skb, NFTA_HOOK_DEVS);
1744 goto nla_put_failure;
1747 hook_list = &basechain->hook_list;
1749 list_for_each_entry(hook, hook_list, list) {
1753 if (nla_put_string(skb, NFTA_DEVICE_NAME,
1754 hook->ops.dev->name))
1755 goto nla_put_failure;
1758 nla_nest_end(skb, nest_devs);
1761 nla_put_string(skb, NFTA_HOOK_DEV, first->ops.dev->name))
1762 goto nla_put_failure;
1764 nla_nest_end(skb, nest);
1771 static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
1772 u32 portid, u32 seq, int event, u32 flags,
1773 int family, const struct nft_table *table,
1774 const struct nft_chain *chain,
1775 const struct list_head *hook_list)
1777 struct nlmsghdr *nlh;
1779 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
1780 nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
1781 NFNETLINK_V0, nft_base_seq(net));
1783 goto nla_put_failure;
1785 if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name) ||
1786 nla_put_string(skb, NFTA_CHAIN_NAME, chain->name) ||
1787 nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle),
1789 goto nla_put_failure;
1791 if (event == NFT_MSG_DELCHAIN && !hook_list) {
1792 nlmsg_end(skb, nlh);
1796 if (nft_is_base_chain(chain)) {
1797 const struct nft_base_chain *basechain = nft_base_chain(chain);
1798 struct nft_stats __percpu *stats;
1800 if (nft_dump_basechain_hook(skb, family, basechain, hook_list))
1801 goto nla_put_failure;
1803 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
1804 htonl(basechain->policy)))
1805 goto nla_put_failure;
1807 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
1808 goto nla_put_failure;
1810 stats = rcu_dereference_check(basechain->stats,
1811 lockdep_commit_lock_is_held(net));
1812 if (nft_dump_stats(skb, stats))
1813 goto nla_put_failure;
1817 nla_put_be32(skb, NFTA_CHAIN_FLAGS, htonl(chain->flags)))
1818 goto nla_put_failure;
1820 if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
1821 goto nla_put_failure;
1824 nla_put(skb, NFTA_CHAIN_USERDATA, chain->udlen, chain->udata))
1825 goto nla_put_failure;
1827 nlmsg_end(skb, nlh);
1831 nlmsg_trim(skb, nlh);
1835 static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event,
1836 const struct list_head *hook_list)
1838 struct nftables_pernet *nft_net;
1839 struct sk_buff *skb;
1844 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1847 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1851 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
1852 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
1854 err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
1855 event, flags, ctx->family, ctx->table,
1856 ctx->chain, hook_list);
1862 nft_net = nft_pernet(ctx->net);
1863 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
1866 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
1869 static int nf_tables_dump_chains(struct sk_buff *skb,
1870 struct netlink_callback *cb)
1872 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1873 unsigned int idx = 0, s_idx = cb->args[0];
1874 struct net *net = sock_net(skb->sk);
1875 int family = nfmsg->nfgen_family;
1876 struct nftables_pernet *nft_net;
1877 const struct nft_table *table;
1878 const struct nft_chain *chain;
1881 nft_net = nft_pernet(net);
1882 cb->seq = READ_ONCE(nft_net->base_seq);
1884 list_for_each_entry_rcu(table, &nft_net->tables, list) {
1885 if (family != NFPROTO_UNSPEC && family != table->family)
1888 list_for_each_entry_rcu(chain, &table->chains, list) {
1892 memset(&cb->args[1], 0,
1893 sizeof(cb->args) - sizeof(cb->args[0]));
1894 if (!nft_is_active(net, chain))
1896 if (nf_tables_fill_chain_info(skb, net,
1897 NETLINK_CB(cb->skb).portid,
1901 table->family, table,
1905 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1916 /* called with rcu_read_lock held */
1917 static int nf_tables_getchain(struct sk_buff *skb, const struct nfnl_info *info,
1918 const struct nlattr * const nla[])
1920 struct netlink_ext_ack *extack = info->extack;
1921 u8 genmask = nft_genmask_cur(info->net);
1922 u8 family = info->nfmsg->nfgen_family;
1923 const struct nft_chain *chain;
1924 struct net *net = info->net;
1925 struct nft_table *table;
1926 struct sk_buff *skb2;
1929 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
1930 struct netlink_dump_control c = {
1931 .dump = nf_tables_dump_chains,
1932 .module = THIS_MODULE,
1935 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
1938 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask, 0);
1939 if (IS_ERR(table)) {
1940 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
1941 return PTR_ERR(table);
1944 chain = nft_chain_lookup(net, table, nla[NFTA_CHAIN_NAME], genmask);
1945 if (IS_ERR(chain)) {
1946 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
1947 return PTR_ERR(chain);
1950 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1954 err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
1955 info->nlh->nlmsg_seq, NFT_MSG_NEWCHAIN,
1956 0, family, table, chain, NULL);
1958 goto err_fill_chain_info;
1960 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
1962 err_fill_chain_info:
1967 static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
1968 [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 },
1969 [NFTA_COUNTER_BYTES] = { .type = NLA_U64 },
1972 static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
1974 struct nlattr *tb[NFTA_COUNTER_MAX+1];
1975 struct nft_stats __percpu *newstats;
1976 struct nft_stats *stats;
1979 err = nla_parse_nested_deprecated(tb, NFTA_COUNTER_MAX, attr,
1980 nft_counter_policy, NULL);
1982 return ERR_PTR(err);
1984 if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
1985 return ERR_PTR(-EINVAL);
1987 newstats = netdev_alloc_pcpu_stats(struct nft_stats);
1988 if (newstats == NULL)
1989 return ERR_PTR(-ENOMEM);
1991 /* Restore old counters on this cpu, no problem. Per-cpu statistics
1992 * are not exposed to userspace.
1995 stats = this_cpu_ptr(newstats);
1996 stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
1997 stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
2003 static void nft_chain_stats_replace(struct nft_trans *trans)
2005 struct nft_base_chain *chain = nft_base_chain(trans->ctx.chain);
2007 if (!nft_trans_chain_stats(trans))
2010 nft_trans_chain_stats(trans) =
2011 rcu_replace_pointer(chain->stats, nft_trans_chain_stats(trans),
2012 lockdep_commit_lock_is_held(trans->ctx.net));
2014 if (!nft_trans_chain_stats(trans))
2015 static_branch_inc(&nft_counters_enabled);
2018 static void nf_tables_chain_free_chain_rules(struct nft_chain *chain)
2020 struct nft_rule_blob *g0 = rcu_dereference_raw(chain->blob_gen_0);
2021 struct nft_rule_blob *g1 = rcu_dereference_raw(chain->blob_gen_1);
2027 /* should be NULL either via abort or via successful commit */
2028 WARN_ON_ONCE(chain->blob_next);
2029 kvfree(chain->blob_next);
2032 void nf_tables_chain_destroy(struct nft_ctx *ctx)
2034 struct nft_chain *chain = ctx->chain;
2035 struct nft_hook *hook, *next;
2037 if (WARN_ON(chain->use > 0))
2040 /* no concurrent access possible anymore */
2041 nf_tables_chain_free_chain_rules(chain);
2043 if (nft_is_base_chain(chain)) {
2044 struct nft_base_chain *basechain = nft_base_chain(chain);
2046 if (nft_base_chain_netdev(ctx->family, basechain->ops.hooknum)) {
2047 list_for_each_entry_safe(hook, next,
2048 &basechain->hook_list, list) {
2049 list_del_rcu(&hook->list);
2050 kfree_rcu(hook, rcu);
2053 module_put(basechain->type->owner);
2054 if (rcu_access_pointer(basechain->stats)) {
2055 static_branch_dec(&nft_counters_enabled);
2056 free_percpu(rcu_dereference_raw(basechain->stats));
2059 kfree(chain->udata);
2063 kfree(chain->udata);
2068 static struct nft_hook *nft_netdev_hook_alloc(struct net *net,
2069 const struct nlattr *attr)
2071 struct net_device *dev;
2072 char ifname[IFNAMSIZ];
2073 struct nft_hook *hook;
2076 hook = kmalloc(sizeof(struct nft_hook), GFP_KERNEL_ACCOUNT);
2079 goto err_hook_alloc;
2082 nla_strscpy(ifname, attr, IFNAMSIZ);
2083 /* nf_tables_netdev_event() is called under rtnl_mutex, this is
2084 * indirectly serializing all the other holders of the commit_mutex with
2087 dev = __dev_get_by_name(net, ifname);
2092 hook->ops.dev = dev;
2099 return ERR_PTR(err);
2102 static struct nft_hook *nft_hook_list_find(struct list_head *hook_list,
2103 const struct nft_hook *this)
2105 struct nft_hook *hook;
2107 list_for_each_entry(hook, hook_list, list) {
2108 if (this->ops.dev == hook->ops.dev)
2115 static int nf_tables_parse_netdev_hooks(struct net *net,
2116 const struct nlattr *attr,
2117 struct list_head *hook_list,
2118 struct netlink_ext_ack *extack)
2120 struct nft_hook *hook, *next;
2121 const struct nlattr *tmp;
2122 int rem, n = 0, err;
2124 nla_for_each_nested(tmp, attr, rem) {
2125 if (nla_type(tmp) != NFTA_DEVICE_NAME) {
2130 hook = nft_netdev_hook_alloc(net, tmp);
2132 NL_SET_BAD_ATTR(extack, tmp);
2133 err = PTR_ERR(hook);
2136 if (nft_hook_list_find(hook_list, hook)) {
2137 NL_SET_BAD_ATTR(extack, tmp);
2142 list_add_tail(&hook->list, hook_list);
2145 if (n == NFT_NETDEVICE_MAX) {
2154 list_for_each_entry_safe(hook, next, hook_list, list) {
2155 list_del(&hook->list);
2161 struct nft_chain_hook {
2164 const struct nft_chain_type *type;
2165 struct list_head list;
2168 static int nft_chain_parse_netdev(struct net *net, struct nlattr *tb[],
2169 struct list_head *hook_list,
2170 struct netlink_ext_ack *extack, u32 flags)
2172 struct nft_hook *hook;
2175 if (tb[NFTA_HOOK_DEV]) {
2176 hook = nft_netdev_hook_alloc(net, tb[NFTA_HOOK_DEV]);
2178 NL_SET_BAD_ATTR(extack, tb[NFTA_HOOK_DEV]);
2179 return PTR_ERR(hook);
2182 list_add_tail(&hook->list, hook_list);
2183 } else if (tb[NFTA_HOOK_DEVS]) {
2184 err = nf_tables_parse_netdev_hooks(net, tb[NFTA_HOOK_DEVS],
2191 if (flags & NFT_CHAIN_HW_OFFLOAD &&
2192 list_empty(hook_list))
2198 static int nft_chain_parse_hook(struct net *net,
2199 struct nft_base_chain *basechain,
2200 const struct nlattr * const nla[],
2201 struct nft_chain_hook *hook, u8 family,
2202 u32 flags, struct netlink_ext_ack *extack)
2204 struct nftables_pernet *nft_net = nft_pernet(net);
2205 struct nlattr *ha[NFTA_HOOK_MAX + 1];
2206 const struct nft_chain_type *type;
2209 lockdep_assert_held(&nft_net->commit_mutex);
2210 lockdep_nfnl_nft_mutex_not_held();
2212 err = nla_parse_nested_deprecated(ha, NFTA_HOOK_MAX,
2213 nla[NFTA_CHAIN_HOOK],
2214 nft_hook_policy, NULL);
2219 if (!ha[NFTA_HOOK_HOOKNUM] ||
2220 !ha[NFTA_HOOK_PRIORITY]) {
2221 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2225 hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
2226 hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
2228 type = __nft_chain_type_get(family, NFT_CHAIN_T_DEFAULT);
2232 if (nla[NFTA_CHAIN_TYPE]) {
2233 type = nf_tables_chain_type_lookup(net, nla[NFTA_CHAIN_TYPE],
2236 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
2237 return PTR_ERR(type);
2240 if (hook->num >= NFT_MAX_HOOKS || !(type->hook_mask & (1 << hook->num)))
2243 if (type->type == NFT_CHAIN_T_NAT &&
2244 hook->priority <= NF_IP_PRI_CONNTRACK)
2247 if (ha[NFTA_HOOK_HOOKNUM]) {
2248 hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
2249 if (hook->num != basechain->ops.hooknum)
2252 if (ha[NFTA_HOOK_PRIORITY]) {
2253 hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
2254 if (hook->priority != basechain->ops.priority)
2258 type = basechain->type;
2261 if (!try_module_get(type->owner)) {
2262 if (nla[NFTA_CHAIN_TYPE])
2263 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
2269 INIT_LIST_HEAD(&hook->list);
2270 if (nft_base_chain_netdev(family, hook->num)) {
2271 err = nft_chain_parse_netdev(net, ha, &hook->list, extack, flags);
2273 module_put(type->owner);
2276 } else if (ha[NFTA_HOOK_DEV] || ha[NFTA_HOOK_DEVS]) {
2277 module_put(type->owner);
2284 static void nft_chain_release_hook(struct nft_chain_hook *hook)
2286 struct nft_hook *h, *next;
2288 list_for_each_entry_safe(h, next, &hook->list, list) {
2292 module_put(hook->type->owner);
2295 static void nft_last_rule(const struct nft_chain *chain, const void *ptr)
2297 struct nft_rule_dp_last *lrule;
2299 BUILD_BUG_ON(offsetof(struct nft_rule_dp_last, end) != 0);
2301 lrule = (struct nft_rule_dp_last *)ptr;
2302 lrule->end.is_last = 1;
2303 lrule->chain = chain;
2304 /* blob size does not include the trailer rule */
2307 static struct nft_rule_blob *nf_tables_chain_alloc_rules(const struct nft_chain *chain,
2310 struct nft_rule_blob *blob;
2315 size += sizeof(struct nft_rule_blob) + sizeof(struct nft_rule_dp_last);
2317 blob = kvmalloc(size, GFP_KERNEL_ACCOUNT);
2322 nft_last_rule(chain, blob->data);
2327 static void nft_basechain_hook_init(struct nf_hook_ops *ops, u8 family,
2328 const struct nft_chain_hook *hook,
2329 struct nft_chain *chain)
2332 ops->hooknum = hook->num;
2333 ops->priority = hook->priority;
2335 ops->hook = hook->type->hooks[ops->hooknum];
2336 ops->hook_ops_type = NF_HOOK_OP_NF_TABLES;
2339 static int nft_basechain_init(struct nft_base_chain *basechain, u8 family,
2340 struct nft_chain_hook *hook, u32 flags)
2342 struct nft_chain *chain;
2345 basechain->type = hook->type;
2346 INIT_LIST_HEAD(&basechain->hook_list);
2347 chain = &basechain->chain;
2349 if (nft_base_chain_netdev(family, hook->num)) {
2350 list_splice_init(&hook->list, &basechain->hook_list);
2351 list_for_each_entry(h, &basechain->hook_list, list)
2352 nft_basechain_hook_init(&h->ops, family, hook, chain);
2354 nft_basechain_hook_init(&basechain->ops, family, hook, chain);
2356 chain->flags |= NFT_CHAIN_BASE | flags;
2357 basechain->policy = NF_ACCEPT;
2358 if (chain->flags & NFT_CHAIN_HW_OFFLOAD &&
2359 !nft_chain_offload_support(basechain)) {
2360 list_splice_init(&basechain->hook_list, &hook->list);
2364 flow_block_init(&basechain->flow_block);
2369 int nft_chain_add(struct nft_table *table, struct nft_chain *chain)
2373 err = rhltable_insert_key(&table->chains_ht, chain->name,
2374 &chain->rhlhead, nft_chain_ht_params);
2378 list_add_tail_rcu(&chain->list, &table->chains);
2383 static u64 chain_id;
2385 static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask,
2386 u8 policy, u32 flags,
2387 struct netlink_ext_ack *extack)
2389 const struct nlattr * const *nla = ctx->nla;
2390 struct nft_table *table = ctx->table;
2391 struct nft_base_chain *basechain;
2392 struct net *net = ctx->net;
2393 char name[NFT_NAME_MAXLEN];
2394 struct nft_rule_blob *blob;
2395 struct nft_trans *trans;
2396 struct nft_chain *chain;
2399 if (table->use == UINT_MAX)
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 trans = nft_trans_chain_add(ctx, NFT_MSG_NEWCHAIN);
2498 if (IS_ERR(trans)) {
2499 err = PTR_ERR(trans);
2500 goto err_unregister_hook;
2503 nft_trans_chain_policy(trans) = NFT_CHAIN_POLICY_UNSET;
2504 if (nft_is_base_chain(chain))
2505 nft_trans_chain_policy(trans) = policy;
2507 err = nft_chain_add(table, chain);
2509 nft_trans_destroy(trans);
2510 goto err_unregister_hook;
2516 err_unregister_hook:
2517 nf_tables_unregister_hook(net, table, chain);
2519 nf_tables_chain_destroy(ctx);
2524 static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
2525 u32 flags, const struct nlattr *attr,
2526 struct netlink_ext_ack *extack)
2528 const struct nlattr * const *nla = ctx->nla;
2529 struct nft_base_chain *basechain = NULL;
2530 struct nft_table *table = ctx->table;
2531 struct nft_chain *chain = ctx->chain;
2532 struct nft_chain_hook hook = {};
2533 struct nft_stats *stats = NULL;
2534 struct nft_hook *h, *next;
2535 struct nf_hook_ops *ops;
2536 struct nft_trans *trans;
2537 bool unregister = false;
2540 if (chain->flags ^ flags)
2543 INIT_LIST_HEAD(&hook.list);
2545 if (nla[NFTA_CHAIN_HOOK]) {
2546 if (!nft_is_base_chain(chain)) {
2547 NL_SET_BAD_ATTR(extack, attr);
2551 basechain = nft_base_chain(chain);
2552 err = nft_chain_parse_hook(ctx->net, basechain, nla, &hook,
2553 ctx->family, flags, extack);
2557 if (basechain->type != hook.type) {
2558 nft_chain_release_hook(&hook);
2559 NL_SET_BAD_ATTR(extack, attr);
2563 if (nft_base_chain_netdev(ctx->family, basechain->ops.hooknum)) {
2564 list_for_each_entry_safe(h, next, &hook.list, list) {
2565 h->ops.pf = basechain->ops.pf;
2566 h->ops.hooknum = basechain->ops.hooknum;
2567 h->ops.priority = basechain->ops.priority;
2568 h->ops.priv = basechain->ops.priv;
2569 h->ops.hook = basechain->ops.hook;
2571 if (nft_hook_list_find(&basechain->hook_list, h)) {
2577 ops = &basechain->ops;
2578 if (ops->hooknum != hook.num ||
2579 ops->priority != hook.priority) {
2580 nft_chain_release_hook(&hook);
2581 NL_SET_BAD_ATTR(extack, attr);
2587 if (nla[NFTA_CHAIN_HANDLE] &&
2588 nla[NFTA_CHAIN_NAME]) {
2589 struct nft_chain *chain2;
2591 chain2 = nft_chain_lookup(ctx->net, table,
2592 nla[NFTA_CHAIN_NAME], genmask);
2593 if (!IS_ERR(chain2)) {
2594 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2600 if (nla[NFTA_CHAIN_COUNTERS]) {
2601 if (!nft_is_base_chain(chain)) {
2606 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2607 if (IS_ERR(stats)) {
2608 err = PTR_ERR(stats);
2613 if (!(table->flags & NFT_TABLE_F_DORMANT) &&
2614 nft_is_base_chain(chain) &&
2615 !list_empty(&hook.list)) {
2616 basechain = nft_base_chain(chain);
2617 ops = &basechain->ops;
2619 if (nft_base_chain_netdev(table->family, basechain->ops.hooknum)) {
2620 err = nft_netdev_register_hooks(ctx->net, &hook.list);
2628 trans = nft_trans_alloc(ctx, NFT_MSG_NEWCHAIN,
2629 sizeof(struct nft_trans_chain));
2633 nft_trans_chain_stats(trans) = stats;
2634 nft_trans_chain_update(trans) = true;
2636 if (nla[NFTA_CHAIN_POLICY])
2637 nft_trans_chain_policy(trans) = policy;
2639 nft_trans_chain_policy(trans) = -1;
2641 if (nla[NFTA_CHAIN_HANDLE] &&
2642 nla[NFTA_CHAIN_NAME]) {
2643 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
2644 struct nft_trans *tmp;
2648 name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL_ACCOUNT);
2653 list_for_each_entry(tmp, &nft_net->commit_list, list) {
2654 if (tmp->msg_type == NFT_MSG_NEWCHAIN &&
2655 tmp->ctx.table == table &&
2656 nft_trans_chain_update(tmp) &&
2657 nft_trans_chain_name(tmp) &&
2658 strcmp(name, nft_trans_chain_name(tmp)) == 0) {
2659 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2665 nft_trans_chain_name(trans) = name;
2668 nft_trans_basechain(trans) = basechain;
2669 INIT_LIST_HEAD(&nft_trans_chain_hooks(trans));
2670 list_splice(&hook.list, &nft_trans_chain_hooks(trans));
2671 if (nla[NFTA_CHAIN_HOOK])
2672 module_put(hook.type->owner);
2674 nft_trans_commit_list_add_tail(ctx->net, trans);
2682 if (nla[NFTA_CHAIN_HOOK]) {
2683 list_for_each_entry_safe(h, next, &hook.list, list) {
2685 nf_unregister_net_hook(ctx->net, &h->ops);
2689 module_put(hook.type->owner);
2695 static struct nft_chain *nft_chain_lookup_byid(const struct net *net,
2696 const struct nft_table *table,
2697 const struct nlattr *nla)
2699 struct nftables_pernet *nft_net = nft_pernet(net);
2700 u32 id = ntohl(nla_get_be32(nla));
2701 struct nft_trans *trans;
2703 list_for_each_entry(trans, &nft_net->commit_list, list) {
2704 struct nft_chain *chain = trans->ctx.chain;
2706 if (trans->msg_type == NFT_MSG_NEWCHAIN &&
2707 chain->table == table &&
2708 id == nft_trans_chain_id(trans))
2711 return ERR_PTR(-ENOENT);
2714 static int nf_tables_newchain(struct sk_buff *skb, const struct nfnl_info *info,
2715 const struct nlattr * const nla[])
2717 struct nftables_pernet *nft_net = nft_pernet(info->net);
2718 struct netlink_ext_ack *extack = info->extack;
2719 u8 genmask = nft_genmask_next(info->net);
2720 u8 family = info->nfmsg->nfgen_family;
2721 struct nft_chain *chain = NULL;
2722 struct net *net = info->net;
2723 const struct nlattr *attr;
2724 struct nft_table *table;
2725 u8 policy = NF_ACCEPT;
2730 lockdep_assert_held(&nft_net->commit_mutex);
2732 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2733 NETLINK_CB(skb).portid);
2734 if (IS_ERR(table)) {
2735 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2736 return PTR_ERR(table);
2740 attr = nla[NFTA_CHAIN_NAME];
2742 if (nla[NFTA_CHAIN_HANDLE]) {
2743 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
2744 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2745 if (IS_ERR(chain)) {
2746 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_HANDLE]);
2747 return PTR_ERR(chain);
2749 attr = nla[NFTA_CHAIN_HANDLE];
2750 } else if (nla[NFTA_CHAIN_NAME]) {
2751 chain = nft_chain_lookup(net, table, attr, genmask);
2752 if (IS_ERR(chain)) {
2753 if (PTR_ERR(chain) != -ENOENT) {
2754 NL_SET_BAD_ATTR(extack, attr);
2755 return PTR_ERR(chain);
2759 } else if (!nla[NFTA_CHAIN_ID]) {
2763 if (nla[NFTA_CHAIN_POLICY]) {
2764 if (chain != NULL &&
2765 !nft_is_base_chain(chain)) {
2766 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2770 if (chain == NULL &&
2771 nla[NFTA_CHAIN_HOOK] == NULL) {
2772 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2776 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
2786 if (nla[NFTA_CHAIN_FLAGS])
2787 flags = ntohl(nla_get_be32(nla[NFTA_CHAIN_FLAGS]));
2789 flags = chain->flags;
2791 if (flags & ~NFT_CHAIN_FLAGS)
2794 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
2796 if (chain != NULL) {
2797 if (chain->flags & NFT_CHAIN_BINDING)
2800 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
2801 NL_SET_BAD_ATTR(extack, attr);
2804 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
2807 flags |= chain->flags & NFT_CHAIN_BASE;
2808 return nf_tables_updchain(&ctx, genmask, policy, flags, attr,
2812 return nf_tables_addchain(&ctx, family, genmask, policy, flags, extack);
2815 static int nft_delchain_hook(struct nft_ctx *ctx,
2816 struct nft_base_chain *basechain,
2817 struct netlink_ext_ack *extack)
2819 const struct nft_chain *chain = &basechain->chain;
2820 const struct nlattr * const *nla = ctx->nla;
2821 struct nft_chain_hook chain_hook = {};
2822 struct nft_hook *this, *hook;
2823 LIST_HEAD(chain_del_list);
2824 struct nft_trans *trans;
2827 err = nft_chain_parse_hook(ctx->net, basechain, nla, &chain_hook,
2828 ctx->family, chain->flags, extack);
2832 list_for_each_entry(this, &chain_hook.list, list) {
2833 hook = nft_hook_list_find(&basechain->hook_list, this);
2836 goto err_chain_del_hook;
2838 list_move(&hook->list, &chain_del_list);
2841 trans = nft_trans_alloc(ctx, NFT_MSG_DELCHAIN,
2842 sizeof(struct nft_trans_chain));
2845 goto err_chain_del_hook;
2848 nft_trans_basechain(trans) = basechain;
2849 nft_trans_chain_update(trans) = true;
2850 INIT_LIST_HEAD(&nft_trans_chain_hooks(trans));
2851 list_splice(&chain_del_list, &nft_trans_chain_hooks(trans));
2852 nft_chain_release_hook(&chain_hook);
2854 nft_trans_commit_list_add_tail(ctx->net, trans);
2859 list_splice(&chain_del_list, &basechain->hook_list);
2860 nft_chain_release_hook(&chain_hook);
2865 static int nf_tables_delchain(struct sk_buff *skb, const struct nfnl_info *info,
2866 const struct nlattr * const nla[])
2868 struct netlink_ext_ack *extack = info->extack;
2869 u8 genmask = nft_genmask_next(info->net);
2870 u8 family = info->nfmsg->nfgen_family;
2871 struct net *net = info->net;
2872 const struct nlattr *attr;
2873 struct nft_table *table;
2874 struct nft_chain *chain;
2875 struct nft_rule *rule;
2881 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2882 NETLINK_CB(skb).portid);
2883 if (IS_ERR(table)) {
2884 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2885 return PTR_ERR(table);
2888 if (nla[NFTA_CHAIN_HANDLE]) {
2889 attr = nla[NFTA_CHAIN_HANDLE];
2890 handle = be64_to_cpu(nla_get_be64(attr));
2891 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2893 attr = nla[NFTA_CHAIN_NAME];
2894 chain = nft_chain_lookup(net, table, attr, genmask);
2896 if (IS_ERR(chain)) {
2897 if (PTR_ERR(chain) == -ENOENT &&
2898 NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYCHAIN)
2901 NL_SET_BAD_ATTR(extack, attr);
2902 return PTR_ERR(chain);
2905 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
2907 if (nla[NFTA_CHAIN_HOOK]) {
2908 if (chain->flags & NFT_CHAIN_HW_OFFLOAD)
2911 if (nft_is_base_chain(chain)) {
2912 struct nft_base_chain *basechain = nft_base_chain(chain);
2914 if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
2915 return nft_delchain_hook(&ctx, basechain, extack);
2919 if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
2924 list_for_each_entry(rule, &chain->rules, list) {
2925 if (!nft_is_active_next(net, rule))
2929 err = nft_delrule(&ctx, rule);
2934 /* There are rules and elements that are still holding references to us,
2935 * we cannot do a recursive removal in this case.
2938 NL_SET_BAD_ATTR(extack, attr);
2942 return nft_delchain(&ctx);
2950 * nft_register_expr - register nf_tables expr type
2953 * Registers the expr type for use with nf_tables. Returns zero on
2954 * success or a negative errno code otherwise.
2956 int nft_register_expr(struct nft_expr_type *type)
2958 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2959 if (type->family == NFPROTO_UNSPEC)
2960 list_add_tail_rcu(&type->list, &nf_tables_expressions);
2962 list_add_rcu(&type->list, &nf_tables_expressions);
2963 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2966 EXPORT_SYMBOL_GPL(nft_register_expr);
2969 * nft_unregister_expr - unregister nf_tables expr type
2972 * Unregisters the expr typefor use with nf_tables.
2974 void nft_unregister_expr(struct nft_expr_type *type)
2976 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2977 list_del_rcu(&type->list);
2978 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2980 EXPORT_SYMBOL_GPL(nft_unregister_expr);
2982 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
2985 const struct nft_expr_type *type, *candidate = NULL;
2987 list_for_each_entry(type, &nf_tables_expressions, list) {
2988 if (!nla_strcmp(nla, type->name)) {
2989 if (!type->family && !candidate)
2991 else if (type->family == family)
2998 #ifdef CONFIG_MODULES
2999 static int nft_expr_type_request_module(struct net *net, u8 family,
3002 if (nft_request_module(net, "nft-expr-%u-%.*s", family,
3003 nla_len(nla), (char *)nla_data(nla)) == -EAGAIN)
3010 static const struct nft_expr_type *nft_expr_type_get(struct net *net,
3014 const struct nft_expr_type *type;
3017 return ERR_PTR(-EINVAL);
3019 type = __nft_expr_type_get(family, nla);
3020 if (type != NULL && try_module_get(type->owner))
3023 lockdep_nfnl_nft_mutex_not_held();
3024 #ifdef CONFIG_MODULES
3026 if (nft_expr_type_request_module(net, family, nla) == -EAGAIN)
3027 return ERR_PTR(-EAGAIN);
3029 if (nft_request_module(net, "nft-expr-%.*s",
3031 (char *)nla_data(nla)) == -EAGAIN)
3032 return ERR_PTR(-EAGAIN);
3035 return ERR_PTR(-ENOENT);
3038 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
3039 [NFTA_EXPR_NAME] = { .type = NLA_STRING,
3040 .len = NFT_MODULE_AUTOLOAD_LIMIT },
3041 [NFTA_EXPR_DATA] = { .type = NLA_NESTED },
3044 static int nf_tables_fill_expr_info(struct sk_buff *skb,
3045 const struct nft_expr *expr, bool reset)
3047 if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
3048 goto nla_put_failure;
3050 if (expr->ops->dump) {
3051 struct nlattr *data = nla_nest_start_noflag(skb,
3054 goto nla_put_failure;
3055 if (expr->ops->dump(skb, expr, reset) < 0)
3056 goto nla_put_failure;
3057 nla_nest_end(skb, data);
3066 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
3067 const struct nft_expr *expr, bool reset)
3069 struct nlattr *nest;
3071 nest = nla_nest_start_noflag(skb, attr);
3073 goto nla_put_failure;
3074 if (nf_tables_fill_expr_info(skb, expr, reset) < 0)
3075 goto nla_put_failure;
3076 nla_nest_end(skb, nest);
3083 struct nft_expr_info {
3084 const struct nft_expr_ops *ops;
3085 const struct nlattr *attr;
3086 struct nlattr *tb[NFT_EXPR_MAXATTR + 1];
3089 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
3090 const struct nlattr *nla,
3091 struct nft_expr_info *info)
3093 const struct nft_expr_type *type;
3094 const struct nft_expr_ops *ops;
3095 struct nlattr *tb[NFTA_EXPR_MAX + 1];
3098 err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
3099 nft_expr_policy, NULL);
3103 type = nft_expr_type_get(ctx->net, ctx->family, tb[NFTA_EXPR_NAME]);
3105 return PTR_ERR(type);
3107 if (tb[NFTA_EXPR_DATA]) {
3108 err = nla_parse_nested_deprecated(info->tb, type->maxattr,
3110 type->policy, NULL);
3114 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
3116 if (type->select_ops != NULL) {
3117 ops = type->select_ops(ctx,
3118 (const struct nlattr * const *)info->tb);
3121 #ifdef CONFIG_MODULES
3123 if (nft_expr_type_request_module(ctx->net,
3125 tb[NFTA_EXPR_NAME]) != -EAGAIN)
3139 module_put(type->owner);
3143 int nft_expr_inner_parse(const struct nft_ctx *ctx, const struct nlattr *nla,
3144 struct nft_expr_info *info)
3146 struct nlattr *tb[NFTA_EXPR_MAX + 1];
3147 const struct nft_expr_type *type;
3150 err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
3151 nft_expr_policy, NULL);
3155 if (!tb[NFTA_EXPR_DATA])
3158 type = __nft_expr_type_get(ctx->family, tb[NFTA_EXPR_NAME]);
3162 if (!type->inner_ops)
3165 err = nla_parse_nested_deprecated(info->tb, type->maxattr,
3167 type->policy, NULL);
3172 info->ops = type->inner_ops;
3180 static int nf_tables_newexpr(const struct nft_ctx *ctx,
3181 const struct nft_expr_info *expr_info,
3182 struct nft_expr *expr)
3184 const struct nft_expr_ops *ops = expr_info->ops;
3189 err = ops->init(ctx, expr, (const struct nlattr **)expr_info->tb);
3200 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
3201 struct nft_expr *expr)
3203 const struct nft_expr_type *type = expr->ops->type;
3205 if (expr->ops->destroy)
3206 expr->ops->destroy(ctx, expr);
3207 module_put(type->owner);
3210 static struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
3211 const struct nlattr *nla)
3213 struct nft_expr_info expr_info;
3214 struct nft_expr *expr;
3215 struct module *owner;
3218 err = nf_tables_expr_parse(ctx, nla, &expr_info);
3220 goto err_expr_parse;
3223 if (!(expr_info.ops->type->flags & NFT_EXPR_STATEFUL))
3224 goto err_expr_stateful;
3227 expr = kzalloc(expr_info.ops->size, GFP_KERNEL_ACCOUNT);
3229 goto err_expr_stateful;
3231 err = nf_tables_newexpr(ctx, &expr_info, expr);
3239 owner = expr_info.ops->type->owner;
3240 if (expr_info.ops->type->release_ops)
3241 expr_info.ops->type->release_ops(expr_info.ops);
3245 return ERR_PTR(err);
3248 int nft_expr_clone(struct nft_expr *dst, struct nft_expr *src)
3252 if (src->ops->clone) {
3253 dst->ops = src->ops;
3254 err = src->ops->clone(dst, src);
3258 memcpy(dst, src, src->ops->size);
3261 __module_get(src->ops->type->owner);
3266 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
3268 nf_tables_expr_destroy(ctx, expr);
3276 static struct nft_rule *__nft_rule_lookup(const struct nft_chain *chain,
3279 struct nft_rule *rule;
3281 // FIXME: this sucks
3282 list_for_each_entry_rcu(rule, &chain->rules, list) {
3283 if (handle == rule->handle)
3287 return ERR_PTR(-ENOENT);
3290 static struct nft_rule *nft_rule_lookup(const struct nft_chain *chain,
3291 const struct nlattr *nla)
3294 return ERR_PTR(-EINVAL);
3296 return __nft_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
3299 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
3300 [NFTA_RULE_TABLE] = { .type = NLA_STRING,
3301 .len = NFT_TABLE_MAXNAMELEN - 1 },
3302 [NFTA_RULE_CHAIN] = { .type = NLA_STRING,
3303 .len = NFT_CHAIN_MAXNAMELEN - 1 },
3304 [NFTA_RULE_HANDLE] = { .type = NLA_U64 },
3305 [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
3306 [NFTA_RULE_COMPAT] = { .type = NLA_NESTED },
3307 [NFTA_RULE_POSITION] = { .type = NLA_U64 },
3308 [NFTA_RULE_USERDATA] = { .type = NLA_BINARY,
3309 .len = NFT_USERDATA_MAXLEN },
3310 [NFTA_RULE_ID] = { .type = NLA_U32 },
3311 [NFTA_RULE_POSITION_ID] = { .type = NLA_U32 },
3312 [NFTA_RULE_CHAIN_ID] = { .type = NLA_U32 },
3315 static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
3316 u32 portid, u32 seq, int event,
3317 u32 flags, int family,
3318 const struct nft_table *table,
3319 const struct nft_chain *chain,
3320 const struct nft_rule *rule, u64 handle,
3323 struct nlmsghdr *nlh;
3324 const struct nft_expr *expr, *next;
3325 struct nlattr *list;
3326 u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
3328 nlh = nfnl_msg_put(skb, portid, seq, type, flags, family, NFNETLINK_V0,
3331 goto nla_put_failure;
3333 if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
3334 goto nla_put_failure;
3335 if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
3336 goto nla_put_failure;
3337 if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
3339 goto nla_put_failure;
3341 if (event != NFT_MSG_DELRULE && handle) {
3342 if (nla_put_be64(skb, NFTA_RULE_POSITION, cpu_to_be64(handle),
3344 goto nla_put_failure;
3347 if (chain->flags & NFT_CHAIN_HW_OFFLOAD)
3348 nft_flow_rule_stats(chain, rule);
3350 list = nla_nest_start_noflag(skb, NFTA_RULE_EXPRESSIONS);
3352 goto nla_put_failure;
3353 nft_rule_for_each_expr(expr, next, rule) {
3354 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr, reset) < 0)
3355 goto nla_put_failure;
3357 nla_nest_end(skb, list);
3360 struct nft_userdata *udata = nft_userdata(rule);
3361 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
3363 goto nla_put_failure;
3366 nlmsg_end(skb, nlh);
3370 nlmsg_trim(skb, nlh);
3374 static void nf_tables_rule_notify(const struct nft_ctx *ctx,
3375 const struct nft_rule *rule, int event)
3377 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
3378 const struct nft_rule *prule;
3379 struct sk_buff *skb;
3385 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
3388 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3392 if (event == NFT_MSG_NEWRULE &&
3393 !list_is_first(&rule->list, &ctx->chain->rules) &&
3394 !list_is_last(&rule->list, &ctx->chain->rules)) {
3395 prule = list_prev_entry(rule, list);
3396 handle = prule->handle;
3398 if (ctx->flags & (NLM_F_APPEND | NLM_F_REPLACE))
3399 flags |= NLM_F_APPEND;
3400 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
3401 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
3403 err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
3404 event, flags, ctx->family, ctx->table,
3405 ctx->chain, rule, handle, false);
3411 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
3414 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
3417 struct nft_rule_dump_ctx {
3422 static int __nf_tables_dump_rules(struct sk_buff *skb,
3424 struct netlink_callback *cb,
3425 const struct nft_table *table,
3426 const struct nft_chain *chain,
3429 struct net *net = sock_net(skb->sk);
3430 const struct nft_rule *rule, *prule;
3431 unsigned int s_idx = cb->args[0];
3435 list_for_each_entry_rcu(rule, &chain->rules, list) {
3436 if (!nft_is_active(net, rule))
3441 memset(&cb->args[1], 0,
3442 sizeof(cb->args) - sizeof(cb->args[0]));
3445 handle = prule->handle;
3449 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
3452 NLM_F_MULTI | NLM_F_APPEND,
3454 table, chain, rule, handle, reset) < 0)
3457 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3466 static int nf_tables_dump_rules(struct sk_buff *skb,
3467 struct netlink_callback *cb)
3469 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
3470 const struct nft_rule_dump_ctx *ctx = cb->data;
3471 struct nft_table *table;
3472 const struct nft_chain *chain;
3473 unsigned int idx = 0;
3474 struct net *net = sock_net(skb->sk);
3475 int family = nfmsg->nfgen_family;
3476 struct nftables_pernet *nft_net;
3479 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETRULE_RESET)
3483 nft_net = nft_pernet(net);
3484 cb->seq = READ_ONCE(nft_net->base_seq);
3486 list_for_each_entry_rcu(table, &nft_net->tables, list) {
3487 if (family != NFPROTO_UNSPEC && family != table->family)
3490 if (ctx && ctx->table && strcmp(ctx->table, table->name) != 0)
3493 if (ctx && ctx->table && ctx->chain) {
3494 struct rhlist_head *list, *tmp;
3496 list = rhltable_lookup(&table->chains_ht, ctx->chain,
3497 nft_chain_ht_params);
3501 rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
3502 if (!nft_is_active(net, chain))
3504 __nf_tables_dump_rules(skb, &idx,
3505 cb, table, chain, reset);
3511 list_for_each_entry_rcu(chain, &table->chains, list) {
3512 if (__nf_tables_dump_rules(skb, &idx,
3513 cb, table, chain, reset))
3517 if (ctx && ctx->table)
3527 static int nf_tables_dump_rules_start(struct netlink_callback *cb)
3529 const struct nlattr * const *nla = cb->data;
3530 struct nft_rule_dump_ctx *ctx = NULL;
3532 if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) {
3533 ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
3537 if (nla[NFTA_RULE_TABLE]) {
3538 ctx->table = nla_strdup(nla[NFTA_RULE_TABLE],
3545 if (nla[NFTA_RULE_CHAIN]) {
3546 ctx->chain = nla_strdup(nla[NFTA_RULE_CHAIN],
3560 static int nf_tables_dump_rules_done(struct netlink_callback *cb)
3562 struct nft_rule_dump_ctx *ctx = cb->data;
3572 /* called with rcu_read_lock held */
3573 static int nf_tables_getrule(struct sk_buff *skb, const struct nfnl_info *info,
3574 const struct nlattr * const nla[])
3576 struct netlink_ext_ack *extack = info->extack;
3577 u8 genmask = nft_genmask_cur(info->net);
3578 u8 family = info->nfmsg->nfgen_family;
3579 const struct nft_chain *chain;
3580 const struct nft_rule *rule;
3581 struct net *net = info->net;
3582 struct nft_table *table;
3583 struct sk_buff *skb2;
3587 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
3588 struct netlink_dump_control c = {
3589 .start= nf_tables_dump_rules_start,
3590 .dump = nf_tables_dump_rules,
3591 .done = nf_tables_dump_rules_done,
3592 .module = THIS_MODULE,
3593 .data = (void *)nla,
3596 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
3599 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask, 0);
3600 if (IS_ERR(table)) {
3601 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3602 return PTR_ERR(table);
3605 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask);
3606 if (IS_ERR(chain)) {
3607 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3608 return PTR_ERR(chain);
3611 rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
3613 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3614 return PTR_ERR(rule);
3617 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
3621 if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_GETRULE_RESET)
3624 err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
3625 info->nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
3626 family, table, chain, rule, 0, reset);
3628 goto err_fill_rule_info;
3630 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
3637 void nf_tables_rule_destroy(const struct nft_ctx *ctx, struct nft_rule *rule)
3639 struct nft_expr *expr, *next;
3642 * Careful: some expressions might not be initialized in case this
3643 * is called on error from nf_tables_newrule().
3645 expr = nft_expr_first(rule);
3646 while (nft_expr_more(rule, expr)) {
3647 next = nft_expr_next(expr);
3648 nf_tables_expr_destroy(ctx, expr);
3654 static void nf_tables_rule_release(const struct nft_ctx *ctx, struct nft_rule *rule)
3656 nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_RELEASE);
3657 nf_tables_rule_destroy(ctx, rule);
3660 int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain)
3662 struct nft_expr *expr, *last;
3663 const struct nft_data *data;
3664 struct nft_rule *rule;
3667 if (ctx->level == NFT_JUMP_STACK_SIZE)
3670 list_for_each_entry(rule, &chain->rules, list) {
3671 if (!nft_is_active_next(ctx->net, rule))
3674 nft_rule_for_each_expr(expr, last, rule) {
3675 if (!expr->ops->validate)
3678 err = expr->ops->validate(ctx, expr, &data);
3688 EXPORT_SYMBOL_GPL(nft_chain_validate);
3690 static int nft_table_validate(struct net *net, const struct nft_table *table)
3692 struct nft_chain *chain;
3693 struct nft_ctx ctx = {
3695 .family = table->family,
3699 list_for_each_entry(chain, &table->chains, list) {
3700 if (!nft_is_base_chain(chain))
3704 err = nft_chain_validate(&ctx, chain);
3712 int nft_setelem_validate(const struct nft_ctx *ctx, struct nft_set *set,
3713 const struct nft_set_iter *iter,
3714 struct nft_set_elem *elem)
3716 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
3717 struct nft_ctx *pctx = (struct nft_ctx *)ctx;
3718 const struct nft_data *data;
3721 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
3722 *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
3725 data = nft_set_ext_data(ext);
3726 switch (data->verdict.code) {
3730 err = nft_chain_validate(ctx, data->verdict.chain);
3742 int nft_set_catchall_validate(const struct nft_ctx *ctx, struct nft_set *set)
3744 u8 genmask = nft_genmask_next(ctx->net);
3745 struct nft_set_elem_catchall *catchall;
3746 struct nft_set_elem elem;
3747 struct nft_set_ext *ext;
3750 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
3751 ext = nft_set_elem_ext(set, catchall->elem);
3752 if (!nft_set_elem_active(ext, genmask))
3755 elem.priv = catchall->elem;
3756 ret = nft_setelem_validate(ctx, set, NULL, &elem);
3764 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3765 const struct nft_chain *chain,
3766 const struct nlattr *nla);
3768 #define NFT_RULE_MAXEXPRS 128
3770 static int nf_tables_newrule(struct sk_buff *skb, const struct nfnl_info *info,
3771 const struct nlattr * const nla[])
3773 struct nftables_pernet *nft_net = nft_pernet(info->net);
3774 struct netlink_ext_ack *extack = info->extack;
3775 unsigned int size, i, n, ulen = 0, usize = 0;
3776 u8 genmask = nft_genmask_next(info->net);
3777 struct nft_rule *rule, *old_rule = NULL;
3778 struct nft_expr_info *expr_info = NULL;
3779 u8 family = info->nfmsg->nfgen_family;
3780 struct nft_flow_rule *flow = NULL;
3781 struct net *net = info->net;
3782 struct nft_userdata *udata;
3783 struct nft_table *table;
3784 struct nft_chain *chain;
3785 struct nft_trans *trans;
3786 u64 handle, pos_handle;
3787 struct nft_expr *expr;
3792 lockdep_assert_held(&nft_net->commit_mutex);
3794 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
3795 NETLINK_CB(skb).portid);
3796 if (IS_ERR(table)) {
3797 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3798 return PTR_ERR(table);
3801 if (nla[NFTA_RULE_CHAIN]) {
3802 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3804 if (IS_ERR(chain)) {
3805 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3806 return PTR_ERR(chain);
3808 if (nft_chain_is_bound(chain))
3811 } else if (nla[NFTA_RULE_CHAIN_ID]) {
3812 chain = nft_chain_lookup_byid(net, table, nla[NFTA_RULE_CHAIN_ID]);
3813 if (IS_ERR(chain)) {
3814 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN_ID]);
3815 return PTR_ERR(chain);
3821 if (nla[NFTA_RULE_HANDLE]) {
3822 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
3823 rule = __nft_rule_lookup(chain, handle);
3825 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3826 return PTR_ERR(rule);
3829 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
3830 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3833 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
3838 if (!(info->nlh->nlmsg_flags & NLM_F_CREATE) ||
3839 info->nlh->nlmsg_flags & NLM_F_REPLACE)
3841 handle = nf_tables_alloc_handle(table);
3843 if (chain->use == UINT_MAX)
3846 if (nla[NFTA_RULE_POSITION]) {
3847 pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
3848 old_rule = __nft_rule_lookup(chain, pos_handle);
3849 if (IS_ERR(old_rule)) {
3850 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION]);
3851 return PTR_ERR(old_rule);
3853 } else if (nla[NFTA_RULE_POSITION_ID]) {
3854 old_rule = nft_rule_lookup_byid(net, chain, nla[NFTA_RULE_POSITION_ID]);
3855 if (IS_ERR(old_rule)) {
3856 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION_ID]);
3857 return PTR_ERR(old_rule);
3862 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
3866 if (nla[NFTA_RULE_EXPRESSIONS]) {
3867 expr_info = kvmalloc_array(NFT_RULE_MAXEXPRS,
3868 sizeof(struct nft_expr_info),
3873 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
3875 if (nla_type(tmp) != NFTA_LIST_ELEM)
3876 goto err_release_expr;
3877 if (n == NFT_RULE_MAXEXPRS)
3878 goto err_release_expr;
3879 err = nf_tables_expr_parse(&ctx, tmp, &expr_info[n]);
3881 NL_SET_BAD_ATTR(extack, tmp);
3882 goto err_release_expr;
3884 size += expr_info[n].ops->size;
3888 /* Check for overflow of dlen field */
3890 if (size >= 1 << 12)
3891 goto err_release_expr;
3893 if (nla[NFTA_RULE_USERDATA]) {
3894 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
3896 usize = sizeof(struct nft_userdata) + ulen;
3900 rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL_ACCOUNT);
3902 goto err_release_expr;
3904 nft_activate_next(net, rule);
3906 rule->handle = handle;
3908 rule->udata = ulen ? 1 : 0;
3911 udata = nft_userdata(rule);
3912 udata->len = ulen - 1;
3913 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
3916 expr = nft_expr_first(rule);
3917 for (i = 0; i < n; i++) {
3918 err = nf_tables_newexpr(&ctx, &expr_info[i], expr);
3920 NL_SET_BAD_ATTR(extack, expr_info[i].attr);
3921 goto err_release_rule;
3924 if (expr_info[i].ops->validate)
3925 nft_validate_state_update(table, NFT_VALIDATE_NEED);
3927 expr_info[i].ops = NULL;
3928 expr = nft_expr_next(expr);
3931 if (chain->flags & NFT_CHAIN_HW_OFFLOAD) {
3932 flow = nft_flow_rule_create(net, rule);
3934 err = PTR_ERR(flow);
3935 goto err_release_rule;
3939 if (info->nlh->nlmsg_flags & NLM_F_REPLACE) {
3940 err = nft_delrule(&ctx, old_rule);
3942 goto err_destroy_flow_rule;
3944 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
3945 if (trans == NULL) {
3947 goto err_destroy_flow_rule;
3949 list_add_tail_rcu(&rule->list, &old_rule->list);
3951 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
3954 goto err_destroy_flow_rule;
3957 if (info->nlh->nlmsg_flags & NLM_F_APPEND) {
3959 list_add_rcu(&rule->list, &old_rule->list);
3961 list_add_tail_rcu(&rule->list, &chain->rules);
3964 list_add_tail_rcu(&rule->list, &old_rule->list);
3966 list_add_rcu(&rule->list, &chain->rules);
3973 nft_trans_flow_rule(trans) = flow;
3975 if (table->validate_state == NFT_VALIDATE_DO)
3976 return nft_table_validate(net, table);
3980 err_destroy_flow_rule:
3982 nft_flow_rule_destroy(flow);
3984 nft_rule_expr_deactivate(&ctx, rule, NFT_TRANS_PREPARE_ERROR);
3985 nf_tables_rule_destroy(&ctx, rule);
3987 for (i = 0; i < n; i++) {
3988 if (expr_info[i].ops) {
3989 module_put(expr_info[i].ops->type->owner);
3990 if (expr_info[i].ops->type->release_ops)
3991 expr_info[i].ops->type->release_ops(expr_info[i].ops);
3999 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
4000 const struct nft_chain *chain,
4001 const struct nlattr *nla)
4003 struct nftables_pernet *nft_net = nft_pernet(net);
4004 u32 id = ntohl(nla_get_be32(nla));
4005 struct nft_trans *trans;
4007 list_for_each_entry(trans, &nft_net->commit_list, list) {
4008 if (trans->msg_type == NFT_MSG_NEWRULE &&
4009 trans->ctx.chain == chain &&
4010 id == nft_trans_rule_id(trans))
4011 return nft_trans_rule(trans);
4013 return ERR_PTR(-ENOENT);
4016 static int nf_tables_delrule(struct sk_buff *skb, const struct nfnl_info *info,
4017 const struct nlattr * const nla[])
4019 struct netlink_ext_ack *extack = info->extack;
4020 u8 genmask = nft_genmask_next(info->net);
4021 u8 family = info->nfmsg->nfgen_family;
4022 struct nft_chain *chain = NULL;
4023 struct net *net = info->net;
4024 struct nft_table *table;
4025 struct nft_rule *rule;
4029 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
4030 NETLINK_CB(skb).portid);
4031 if (IS_ERR(table)) {
4032 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
4033 return PTR_ERR(table);
4036 if (nla[NFTA_RULE_CHAIN]) {
4037 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
4039 if (IS_ERR(chain)) {
4040 if (PTR_ERR(chain) == -ENOENT &&
4041 NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYRULE)
4044 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
4045 return PTR_ERR(chain);
4047 if (nft_chain_is_bound(chain))
4051 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
4054 if (nla[NFTA_RULE_HANDLE]) {
4055 rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
4057 if (PTR_ERR(rule) == -ENOENT &&
4058 NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYRULE)
4061 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
4062 return PTR_ERR(rule);
4065 err = nft_delrule(&ctx, rule);
4066 } else if (nla[NFTA_RULE_ID]) {
4067 rule = nft_rule_lookup_byid(net, chain, nla[NFTA_RULE_ID]);
4069 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_ID]);
4070 return PTR_ERR(rule);
4073 err = nft_delrule(&ctx, rule);
4075 err = nft_delrule_by_chain(&ctx);
4078 list_for_each_entry(chain, &table->chains, list) {
4079 if (!nft_is_active_next(net, chain))
4083 err = nft_delrule_by_chain(&ctx);
4095 static const struct nft_set_type *nft_set_types[] = {
4096 &nft_set_hash_fast_type,
4098 &nft_set_rhash_type,
4099 &nft_set_bitmap_type,
4100 &nft_set_rbtree_type,
4101 #if defined(CONFIG_X86_64) && !defined(CONFIG_UML)
4102 &nft_set_pipapo_avx2_type,
4104 &nft_set_pipapo_type,
4107 #define NFT_SET_FEATURES (NFT_SET_INTERVAL | NFT_SET_MAP | \
4108 NFT_SET_TIMEOUT | NFT_SET_OBJECT | \
4111 static bool nft_set_ops_candidate(const struct nft_set_type *type, u32 flags)
4113 return (flags & type->features) == (flags & NFT_SET_FEATURES);
4117 * Select a set implementation based on the data characteristics and the
4118 * given policy. The total memory use might not be known if no size is
4119 * given, in that case the amount of memory per element is used.
4121 static const struct nft_set_ops *
4122 nft_select_set_ops(const struct nft_ctx *ctx,
4123 const struct nlattr * const nla[],
4124 const struct nft_set_desc *desc)
4126 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
4127 const struct nft_set_ops *ops, *bops;
4128 struct nft_set_estimate est, best;
4129 const struct nft_set_type *type;
4133 lockdep_assert_held(&nft_net->commit_mutex);
4134 lockdep_nfnl_nft_mutex_not_held();
4136 if (nla[NFTA_SET_FLAGS] != NULL)
4137 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
4144 for (i = 0; i < ARRAY_SIZE(nft_set_types); i++) {
4145 type = nft_set_types[i];
4148 if (!nft_set_ops_candidate(type, flags))
4150 if (!ops->estimate(desc, flags, &est))
4153 switch (desc->policy) {
4154 case NFT_SET_POL_PERFORMANCE:
4155 if (est.lookup < best.lookup)
4157 if (est.lookup == best.lookup &&
4158 est.space < best.space)
4161 case NFT_SET_POL_MEMORY:
4163 if (est.space < best.space)
4165 if (est.space == best.space &&
4166 est.lookup < best.lookup)
4168 } else if (est.size < best.size || !bops) {
4183 return ERR_PTR(-EOPNOTSUPP);
4186 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
4187 [NFTA_SET_TABLE] = { .type = NLA_STRING,
4188 .len = NFT_TABLE_MAXNAMELEN - 1 },
4189 [NFTA_SET_NAME] = { .type = NLA_STRING,
4190 .len = NFT_SET_MAXNAMELEN - 1 },
4191 [NFTA_SET_FLAGS] = { .type = NLA_U32 },
4192 [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 },
4193 [NFTA_SET_KEY_LEN] = { .type = NLA_U32 },
4194 [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 },
4195 [NFTA_SET_DATA_LEN] = { .type = NLA_U32 },
4196 [NFTA_SET_POLICY] = { .type = NLA_U32 },
4197 [NFTA_SET_DESC] = { .type = NLA_NESTED },
4198 [NFTA_SET_ID] = { .type = NLA_U32 },
4199 [NFTA_SET_TIMEOUT] = { .type = NLA_U64 },
4200 [NFTA_SET_GC_INTERVAL] = { .type = NLA_U32 },
4201 [NFTA_SET_USERDATA] = { .type = NLA_BINARY,
4202 .len = NFT_USERDATA_MAXLEN },
4203 [NFTA_SET_OBJ_TYPE] = { .type = NLA_U32 },
4204 [NFTA_SET_HANDLE] = { .type = NLA_U64 },
4205 [NFTA_SET_EXPR] = { .type = NLA_NESTED },
4206 [NFTA_SET_EXPRESSIONS] = { .type = NLA_NESTED },
4209 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
4210 [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 },
4211 [NFTA_SET_DESC_CONCAT] = { .type = NLA_NESTED },
4214 static struct nft_set *nft_set_lookup(const struct nft_table *table,
4215 const struct nlattr *nla, u8 genmask)
4217 struct nft_set *set;
4220 return ERR_PTR(-EINVAL);
4222 list_for_each_entry_rcu(set, &table->sets, list) {
4223 if (!nla_strcmp(nla, set->name) &&
4224 nft_active_genmask(set, genmask))
4227 return ERR_PTR(-ENOENT);
4230 static struct nft_set *nft_set_lookup_byhandle(const struct nft_table *table,
4231 const struct nlattr *nla,
4234 struct nft_set *set;
4236 list_for_each_entry(set, &table->sets, list) {
4237 if (be64_to_cpu(nla_get_be64(nla)) == set->handle &&
4238 nft_active_genmask(set, genmask))
4241 return ERR_PTR(-ENOENT);
4244 static struct nft_set *nft_set_lookup_byid(const struct net *net,
4245 const struct nft_table *table,
4246 const struct nlattr *nla, u8 genmask)
4248 struct nftables_pernet *nft_net = nft_pernet(net);
4249 u32 id = ntohl(nla_get_be32(nla));
4250 struct nft_trans *trans;
4252 list_for_each_entry(trans, &nft_net->commit_list, list) {
4253 if (trans->msg_type == NFT_MSG_NEWSET) {
4254 struct nft_set *set = nft_trans_set(trans);
4256 if (id == nft_trans_set_id(trans) &&
4257 set->table == table &&
4258 nft_active_genmask(set, genmask))
4262 return ERR_PTR(-ENOENT);
4265 struct nft_set *nft_set_lookup_global(const struct net *net,
4266 const struct nft_table *table,
4267 const struct nlattr *nla_set_name,
4268 const struct nlattr *nla_set_id,
4271 struct nft_set *set;
4273 set = nft_set_lookup(table, nla_set_name, genmask);
4278 set = nft_set_lookup_byid(net, table, nla_set_id, genmask);
4282 EXPORT_SYMBOL_GPL(nft_set_lookup_global);
4284 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
4287 const struct nft_set *i;
4289 unsigned long *inuse;
4290 unsigned int n = 0, min = 0;
4292 p = strchr(name, '%');
4294 if (p[1] != 'd' || strchr(p + 2, '%'))
4297 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
4301 list_for_each_entry(i, &ctx->table->sets, list) {
4304 if (!nft_is_active_next(ctx->net, i))
4306 if (!sscanf(i->name, name, &tmp))
4308 if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
4311 set_bit(tmp - min, inuse);
4314 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
4315 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
4316 min += BITS_PER_BYTE * PAGE_SIZE;
4317 memset(inuse, 0, PAGE_SIZE);
4320 free_page((unsigned long)inuse);
4323 set->name = kasprintf(GFP_KERNEL_ACCOUNT, name, min + n);
4327 list_for_each_entry(i, &ctx->table->sets, list) {
4328 if (!nft_is_active_next(ctx->net, i))
4330 if (!strcmp(set->name, i->name)) {
4339 int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result)
4341 u64 ms = be64_to_cpu(nla_get_be64(nla));
4342 u64 max = (u64)(~((u64)0));
4344 max = div_u64(max, NSEC_PER_MSEC);
4348 ms *= NSEC_PER_MSEC;
4349 *result = nsecs_to_jiffies64(ms);
4353 __be64 nf_jiffies64_to_msecs(u64 input)
4355 return cpu_to_be64(jiffies64_to_msecs(input));
4358 static int nf_tables_fill_set_concat(struct sk_buff *skb,
4359 const struct nft_set *set)
4361 struct nlattr *concat, *field;
4364 concat = nla_nest_start_noflag(skb, NFTA_SET_DESC_CONCAT);
4368 for (i = 0; i < set->field_count; i++) {
4369 field = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
4373 if (nla_put_be32(skb, NFTA_SET_FIELD_LEN,
4374 htonl(set->field_len[i])))
4377 nla_nest_end(skb, field);
4380 nla_nest_end(skb, concat);
4385 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
4386 const struct nft_set *set, u16 event, u16 flags)
4388 u64 timeout = READ_ONCE(set->timeout);
4389 u32 gc_int = READ_ONCE(set->gc_int);
4390 u32 portid = ctx->portid;
4391 struct nlmsghdr *nlh;
4392 struct nlattr *nest;
4396 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
4397 nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
4398 NFNETLINK_V0, nft_base_seq(ctx->net));
4400 goto nla_put_failure;
4402 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
4403 goto nla_put_failure;
4404 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
4405 goto nla_put_failure;
4406 if (nla_put_be64(skb, NFTA_SET_HANDLE, cpu_to_be64(set->handle),
4408 goto nla_put_failure;
4410 if (event == NFT_MSG_DELSET) {
4411 nlmsg_end(skb, nlh);
4415 if (set->flags != 0)
4416 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
4417 goto nla_put_failure;
4419 if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
4420 goto nla_put_failure;
4421 if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
4422 goto nla_put_failure;
4423 if (set->flags & NFT_SET_MAP) {
4424 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
4425 goto nla_put_failure;
4426 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
4427 goto nla_put_failure;
4429 if (set->flags & NFT_SET_OBJECT &&
4430 nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
4431 goto nla_put_failure;
4434 nla_put_be64(skb, NFTA_SET_TIMEOUT,
4435 nf_jiffies64_to_msecs(timeout),
4437 goto nla_put_failure;
4439 nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(gc_int)))
4440 goto nla_put_failure;
4442 if (set->policy != NFT_SET_POL_PERFORMANCE) {
4443 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
4444 goto nla_put_failure;
4448 nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
4449 goto nla_put_failure;
4451 nest = nla_nest_start_noflag(skb, NFTA_SET_DESC);
4453 goto nla_put_failure;
4455 nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
4456 goto nla_put_failure;
4458 if (set->field_count > 1 &&
4459 nf_tables_fill_set_concat(skb, set))
4460 goto nla_put_failure;
4462 nla_nest_end(skb, nest);
4464 if (set->num_exprs == 1) {
4465 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPR);
4466 if (nf_tables_fill_expr_info(skb, set->exprs[0], false) < 0)
4467 goto nla_put_failure;
4469 nla_nest_end(skb, nest);
4470 } else if (set->num_exprs > 1) {
4471 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPRESSIONS);
4473 goto nla_put_failure;
4475 for (i = 0; i < set->num_exprs; i++) {
4476 if (nft_expr_dump(skb, NFTA_LIST_ELEM,
4477 set->exprs[i], false) < 0)
4478 goto nla_put_failure;
4480 nla_nest_end(skb, nest);
4483 nlmsg_end(skb, nlh);
4487 nlmsg_trim(skb, nlh);
4491 static void nf_tables_set_notify(const struct nft_ctx *ctx,
4492 const struct nft_set *set, int event,
4495 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
4496 u32 portid = ctx->portid;
4497 struct sk_buff *skb;
4502 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
4505 skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
4509 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
4510 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
4512 err = nf_tables_fill_set(skb, ctx, set, event, flags);
4518 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
4521 nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
4524 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
4526 const struct nft_set *set;
4527 unsigned int idx, s_idx = cb->args[0];
4528 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
4529 struct net *net = sock_net(skb->sk);
4530 struct nft_ctx *ctx = cb->data, ctx_set;
4531 struct nftables_pernet *nft_net;
4537 nft_net = nft_pernet(net);
4538 cb->seq = READ_ONCE(nft_net->base_seq);
4540 list_for_each_entry_rcu(table, &nft_net->tables, list) {
4541 if (ctx->family != NFPROTO_UNSPEC &&
4542 ctx->family != table->family)
4545 if (ctx->table && ctx->table != table)
4549 if (cur_table != table)
4555 list_for_each_entry_rcu(set, &table->sets, list) {
4558 if (!nft_is_active(net, set))
4562 ctx_set.table = table;
4563 ctx_set.family = table->family;
4565 if (nf_tables_fill_set(skb, &ctx_set, set,
4569 cb->args[2] = (unsigned long) table;
4572 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4585 static int nf_tables_dump_sets_start(struct netlink_callback *cb)
4587 struct nft_ctx *ctx_dump = NULL;
4589 ctx_dump = kmemdup(cb->data, sizeof(*ctx_dump), GFP_ATOMIC);
4590 if (ctx_dump == NULL)
4593 cb->data = ctx_dump;
4597 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
4603 /* called with rcu_read_lock held */
4604 static int nf_tables_getset(struct sk_buff *skb, const struct nfnl_info *info,
4605 const struct nlattr * const nla[])
4607 struct netlink_ext_ack *extack = info->extack;
4608 u8 genmask = nft_genmask_cur(info->net);
4609 u8 family = info->nfmsg->nfgen_family;
4610 struct nft_table *table = NULL;
4611 struct net *net = info->net;
4612 const struct nft_set *set;
4613 struct sk_buff *skb2;
4617 if (nla[NFTA_SET_TABLE]) {
4618 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
4620 if (IS_ERR(table)) {
4621 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4622 return PTR_ERR(table);
4626 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4628 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
4629 struct netlink_dump_control c = {
4630 .start = nf_tables_dump_sets_start,
4631 .dump = nf_tables_dump_sets,
4632 .done = nf_tables_dump_sets_done,
4634 .module = THIS_MODULE,
4637 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
4640 /* Only accept unspec with dump */
4641 if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
4642 return -EAFNOSUPPORT;
4643 if (!nla[NFTA_SET_TABLE])
4646 set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
4648 return PTR_ERR(set);
4650 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
4654 err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
4656 goto err_fill_set_info;
4658 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
4665 static const struct nla_policy nft_concat_policy[NFTA_SET_FIELD_MAX + 1] = {
4666 [NFTA_SET_FIELD_LEN] = { .type = NLA_U32 },
4669 static int nft_set_desc_concat_parse(const struct nlattr *attr,
4670 struct nft_set_desc *desc)
4672 struct nlattr *tb[NFTA_SET_FIELD_MAX + 1];
4676 if (desc->field_count >= ARRAY_SIZE(desc->field_len))
4679 err = nla_parse_nested_deprecated(tb, NFTA_SET_FIELD_MAX, attr,
4680 nft_concat_policy, NULL);
4684 if (!tb[NFTA_SET_FIELD_LEN])
4687 len = ntohl(nla_get_be32(tb[NFTA_SET_FIELD_LEN]));
4688 if (!len || len > U8_MAX)
4691 desc->field_len[desc->field_count++] = len;
4696 static int nft_set_desc_concat(struct nft_set_desc *desc,
4697 const struct nlattr *nla)
4699 struct nlattr *attr;
4703 nla_for_each_nested(attr, nla, rem) {
4704 if (nla_type(attr) != NFTA_LIST_ELEM)
4707 err = nft_set_desc_concat_parse(attr, desc);
4712 for (i = 0; i < desc->field_count; i++)
4713 num_regs += DIV_ROUND_UP(desc->field_len[i], sizeof(u32));
4715 if (num_regs > NFT_REG32_COUNT)
4721 static int nf_tables_set_desc_parse(struct nft_set_desc *desc,
4722 const struct nlattr *nla)
4724 struct nlattr *da[NFTA_SET_DESC_MAX + 1];
4727 err = nla_parse_nested_deprecated(da, NFTA_SET_DESC_MAX, nla,
4728 nft_set_desc_policy, NULL);
4732 if (da[NFTA_SET_DESC_SIZE] != NULL)
4733 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
4734 if (da[NFTA_SET_DESC_CONCAT])
4735 err = nft_set_desc_concat(desc, da[NFTA_SET_DESC_CONCAT]);
4740 static int nft_set_expr_alloc(struct nft_ctx *ctx, struct nft_set *set,
4741 const struct nlattr * const *nla,
4742 struct nft_expr **exprs, int *num_exprs,
4745 struct nft_expr *expr;
4748 if (nla[NFTA_SET_EXPR]) {
4749 expr = nft_set_elem_expr_alloc(ctx, set, nla[NFTA_SET_EXPR]);
4751 err = PTR_ERR(expr);
4752 goto err_set_expr_alloc;
4756 } else if (nla[NFTA_SET_EXPRESSIONS]) {
4760 if (!(flags & NFT_SET_EXPR)) {
4762 goto err_set_expr_alloc;
4765 nla_for_each_nested(tmp, nla[NFTA_SET_EXPRESSIONS], left) {
4766 if (i == NFT_SET_EXPR_MAX) {
4768 goto err_set_expr_alloc;
4770 if (nla_type(tmp) != NFTA_LIST_ELEM) {
4772 goto err_set_expr_alloc;
4774 expr = nft_set_elem_expr_alloc(ctx, set, tmp);
4776 err = PTR_ERR(expr);
4777 goto err_set_expr_alloc;
4787 for (i = 0; i < *num_exprs; i++)
4788 nft_expr_destroy(ctx, exprs[i]);
4793 static bool nft_set_is_same(const struct nft_set *set,
4794 const struct nft_set_desc *desc,
4795 struct nft_expr *exprs[], u32 num_exprs, u32 flags)
4799 if (set->ktype != desc->ktype ||
4800 set->dtype != desc->dtype ||
4801 set->flags != flags ||
4802 set->klen != desc->klen ||
4803 set->dlen != desc->dlen ||
4804 set->field_count != desc->field_count ||
4805 set->num_exprs != num_exprs)
4808 for (i = 0; i < desc->field_count; i++) {
4809 if (set->field_len[i] != desc->field_len[i])
4813 for (i = 0; i < num_exprs; i++) {
4814 if (set->exprs[i]->ops != exprs[i]->ops)
4821 static int nf_tables_newset(struct sk_buff *skb, const struct nfnl_info *info,
4822 const struct nlattr * const nla[])
4824 struct netlink_ext_ack *extack = info->extack;
4825 u8 genmask = nft_genmask_next(info->net);
4826 u8 family = info->nfmsg->nfgen_family;
4827 const struct nft_set_ops *ops;
4828 struct net *net = info->net;
4829 struct nft_set_desc desc;
4830 struct nft_table *table;
4831 unsigned char *udata;
4832 struct nft_set *set;
4842 if (nla[NFTA_SET_TABLE] == NULL ||
4843 nla[NFTA_SET_NAME] == NULL ||
4844 nla[NFTA_SET_KEY_LEN] == NULL ||
4845 nla[NFTA_SET_ID] == NULL)
4848 memset(&desc, 0, sizeof(desc));
4850 desc.ktype = NFT_DATA_VALUE;
4851 if (nla[NFTA_SET_KEY_TYPE] != NULL) {
4852 desc.ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
4853 if ((desc.ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
4857 desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
4858 if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
4862 if (nla[NFTA_SET_FLAGS] != NULL) {
4863 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
4864 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
4865 NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
4866 NFT_SET_MAP | NFT_SET_EVAL |
4867 NFT_SET_OBJECT | NFT_SET_CONCAT | NFT_SET_EXPR))
4869 /* Only one of these operations is supported */
4870 if ((flags & (NFT_SET_MAP | NFT_SET_OBJECT)) ==
4871 (NFT_SET_MAP | NFT_SET_OBJECT))
4873 if ((flags & (NFT_SET_EVAL | NFT_SET_OBJECT)) ==
4874 (NFT_SET_EVAL | NFT_SET_OBJECT))
4879 if (nla[NFTA_SET_DATA_TYPE] != NULL) {
4880 if (!(flags & NFT_SET_MAP))
4883 desc.dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
4884 if ((desc.dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
4885 desc.dtype != NFT_DATA_VERDICT)
4888 if (desc.dtype != NFT_DATA_VERDICT) {
4889 if (nla[NFTA_SET_DATA_LEN] == NULL)
4891 desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
4892 if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
4895 desc.dlen = sizeof(struct nft_verdict);
4896 } else if (flags & NFT_SET_MAP)
4899 if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
4900 if (!(flags & NFT_SET_OBJECT))
4903 desc.objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
4904 if (desc.objtype == NFT_OBJECT_UNSPEC ||
4905 desc.objtype > NFT_OBJECT_MAX)
4907 } else if (flags & NFT_SET_OBJECT)
4910 desc.objtype = NFT_OBJECT_UNSPEC;
4913 if (nla[NFTA_SET_TIMEOUT] != NULL) {
4914 if (!(flags & NFT_SET_TIMEOUT))
4917 if (flags & NFT_SET_ANONYMOUS)
4920 err = nf_msecs_to_jiffies64(nla[NFTA_SET_TIMEOUT], &desc.timeout);
4925 if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
4926 if (!(flags & NFT_SET_TIMEOUT))
4929 if (flags & NFT_SET_ANONYMOUS)
4932 desc.gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
4935 desc.policy = NFT_SET_POL_PERFORMANCE;
4936 if (nla[NFTA_SET_POLICY] != NULL)
4937 desc.policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
4939 if (nla[NFTA_SET_DESC] != NULL) {
4940 err = nf_tables_set_desc_parse(&desc, nla[NFTA_SET_DESC]);
4944 if (desc.field_count > 1 && !(flags & NFT_SET_CONCAT))
4946 } else if (flags & NFT_SET_CONCAT) {
4950 if (nla[NFTA_SET_EXPR] || nla[NFTA_SET_EXPRESSIONS])
4953 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, genmask,
4954 NETLINK_CB(skb).portid);
4955 if (IS_ERR(table)) {
4956 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4957 return PTR_ERR(table);
4960 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4962 set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
4964 if (PTR_ERR(set) != -ENOENT) {
4965 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4966 return PTR_ERR(set);
4969 struct nft_expr *exprs[NFT_SET_EXPR_MAX] = {};
4971 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
4972 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4975 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
4978 if (nft_set_is_anonymous(set))
4981 err = nft_set_expr_alloc(&ctx, set, nla, exprs, &num_exprs, flags);
4986 if (!nft_set_is_same(set, &desc, exprs, num_exprs, flags)) {
4987 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4991 for (i = 0; i < num_exprs; i++)
4992 nft_expr_destroy(&ctx, exprs[i]);
4997 return __nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set, &desc);
5000 if (!(info->nlh->nlmsg_flags & NLM_F_CREATE))
5003 ops = nft_select_set_ops(&ctx, nla, &desc);
5005 return PTR_ERR(ops);
5008 if (nla[NFTA_SET_USERDATA])
5009 udlen = nla_len(nla[NFTA_SET_USERDATA]);
5012 if (ops->privsize != NULL)
5013 size = ops->privsize(nla, &desc);
5014 alloc_size = sizeof(*set) + size + udlen;
5015 if (alloc_size < size || alloc_size > INT_MAX)
5017 set = kvzalloc(alloc_size, GFP_KERNEL_ACCOUNT);
5021 name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL_ACCOUNT);
5027 err = nf_tables_set_alloc_name(&ctx, set, name);
5034 udata = set->data + size;
5035 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
5038 INIT_LIST_HEAD(&set->bindings);
5039 INIT_LIST_HEAD(&set->catchall_list);
5041 write_pnet(&set->net, net);
5043 set->ktype = desc.ktype;
5044 set->klen = desc.klen;
5045 set->dtype = desc.dtype;
5046 set->objtype = desc.objtype;
5047 set->dlen = desc.dlen;
5049 set->size = desc.size;
5050 set->policy = desc.policy;
5053 set->timeout = desc.timeout;
5054 set->gc_int = desc.gc_int;
5056 set->field_count = desc.field_count;
5057 for (i = 0; i < desc.field_count; i++)
5058 set->field_len[i] = desc.field_len[i];
5060 err = ops->init(set, &desc, nla);
5064 err = nft_set_expr_alloc(&ctx, set, nla, set->exprs, &num_exprs, flags);
5066 goto err_set_destroy;
5068 set->num_exprs = num_exprs;
5069 set->handle = nf_tables_alloc_handle(table);
5070 INIT_LIST_HEAD(&set->pending_update);
5072 err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
5074 goto err_set_expr_alloc;
5076 list_add_tail_rcu(&set->list, &table->sets);
5081 for (i = 0; i < set->num_exprs; i++)
5082 nft_expr_destroy(&ctx, set->exprs[i]);
5084 ops->destroy(&ctx, set);
5092 static void nft_set_catchall_destroy(const struct nft_ctx *ctx,
5093 struct nft_set *set)
5095 struct nft_set_elem_catchall *next, *catchall;
5097 list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
5098 list_del_rcu(&catchall->list);
5099 nf_tables_set_elem_destroy(ctx, set, catchall->elem);
5100 kfree_rcu(catchall, rcu);
5104 static void nft_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
5108 if (WARN_ON(set->use > 0))
5111 for (i = 0; i < set->num_exprs; i++)
5112 nft_expr_destroy(ctx, set->exprs[i]);
5114 set->ops->destroy(ctx, set);
5115 nft_set_catchall_destroy(ctx, set);
5120 static int nf_tables_delset(struct sk_buff *skb, const struct nfnl_info *info,
5121 const struct nlattr * const nla[])
5123 struct netlink_ext_ack *extack = info->extack;
5124 u8 genmask = nft_genmask_next(info->net);
5125 u8 family = info->nfmsg->nfgen_family;
5126 struct net *net = info->net;
5127 const struct nlattr *attr;
5128 struct nft_table *table;
5129 struct nft_set *set;
5132 if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
5133 return -EAFNOSUPPORT;
5135 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
5136 genmask, NETLINK_CB(skb).portid);
5137 if (IS_ERR(table)) {
5138 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
5139 return PTR_ERR(table);
5142 if (nla[NFTA_SET_HANDLE]) {
5143 attr = nla[NFTA_SET_HANDLE];
5144 set = nft_set_lookup_byhandle(table, attr, genmask);
5146 attr = nla[NFTA_SET_NAME];
5147 set = nft_set_lookup(table, attr, genmask);
5151 if (PTR_ERR(set) == -ENOENT &&
5152 NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYSET)
5155 NL_SET_BAD_ATTR(extack, attr);
5156 return PTR_ERR(set);
5159 (info->nlh->nlmsg_flags & NLM_F_NONREC &&
5160 atomic_read(&set->nelems) > 0)) {
5161 NL_SET_BAD_ATTR(extack, attr);
5165 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
5167 return nft_delset(&ctx, set);
5170 static int nft_validate_register_store(const struct nft_ctx *ctx,
5171 enum nft_registers reg,
5172 const struct nft_data *data,
5173 enum nft_data_types type,
5176 static int nft_setelem_data_validate(const struct nft_ctx *ctx,
5177 struct nft_set *set,
5178 struct nft_set_elem *elem)
5180 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5181 enum nft_registers dreg;
5183 dreg = nft_type_to_reg(set->dtype);
5184 return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
5185 set->dtype == NFT_DATA_VERDICT ?
5186 NFT_DATA_VERDICT : NFT_DATA_VALUE,
5190 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
5191 struct nft_set *set,
5192 const struct nft_set_iter *iter,
5193 struct nft_set_elem *elem)
5195 return nft_setelem_data_validate(ctx, set, elem);
5198 static int nft_set_catchall_bind_check(const struct nft_ctx *ctx,
5199 struct nft_set *set)
5201 u8 genmask = nft_genmask_next(ctx->net);
5202 struct nft_set_elem_catchall *catchall;
5203 struct nft_set_elem elem;
5204 struct nft_set_ext *ext;
5207 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5208 ext = nft_set_elem_ext(set, catchall->elem);
5209 if (!nft_set_elem_active(ext, genmask))
5212 elem.priv = catchall->elem;
5213 ret = nft_setelem_data_validate(ctx, set, &elem);
5221 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
5222 struct nft_set_binding *binding)
5224 struct nft_set_binding *i;
5225 struct nft_set_iter iter;
5227 if (set->use == UINT_MAX)
5230 if (!list_empty(&set->bindings) && nft_set_is_anonymous(set))
5233 if (binding->flags & NFT_SET_MAP) {
5234 /* If the set is already bound to the same chain all
5235 * jumps are already validated for that chain.
5237 list_for_each_entry(i, &set->bindings, list) {
5238 if (i->flags & NFT_SET_MAP &&
5239 i->chain == binding->chain)
5243 iter.genmask = nft_genmask_next(ctx->net);
5247 iter.fn = nf_tables_bind_check_setelem;
5249 set->ops->walk(ctx, set, &iter);
5251 iter.err = nft_set_catchall_bind_check(ctx, set);
5257 binding->chain = ctx->chain;
5258 list_add_tail_rcu(&binding->list, &set->bindings);
5259 nft_set_trans_bind(ctx, set);
5264 EXPORT_SYMBOL_GPL(nf_tables_bind_set);
5266 static void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
5267 struct nft_set_binding *binding, bool event)
5269 list_del_rcu(&binding->list);
5271 if (list_empty(&set->bindings) && nft_set_is_anonymous(set)) {
5272 list_del_rcu(&set->list);
5274 nf_tables_set_notify(ctx, set, NFT_MSG_DELSET,
5279 static void nft_setelem_data_activate(const struct net *net,
5280 const struct nft_set *set,
5281 struct nft_set_elem *elem);
5283 static int nft_mapelem_activate(const struct nft_ctx *ctx,
5284 struct nft_set *set,
5285 const struct nft_set_iter *iter,
5286 struct nft_set_elem *elem)
5288 nft_setelem_data_activate(ctx->net, set, elem);
5293 static void nft_map_catchall_activate(const struct nft_ctx *ctx,
5294 struct nft_set *set)
5296 u8 genmask = nft_genmask_next(ctx->net);
5297 struct nft_set_elem_catchall *catchall;
5298 struct nft_set_elem elem;
5299 struct nft_set_ext *ext;
5301 list_for_each_entry(catchall, &set->catchall_list, list) {
5302 ext = nft_set_elem_ext(set, catchall->elem);
5303 if (!nft_set_elem_active(ext, genmask))
5306 elem.priv = catchall->elem;
5307 nft_setelem_data_activate(ctx->net, set, &elem);
5312 static void nft_map_activate(const struct nft_ctx *ctx, struct nft_set *set)
5314 struct nft_set_iter iter = {
5315 .genmask = nft_genmask_next(ctx->net),
5316 .fn = nft_mapelem_activate,
5319 set->ops->walk(ctx, set, &iter);
5320 WARN_ON_ONCE(iter.err);
5322 nft_map_catchall_activate(ctx, set);
5325 void nf_tables_activate_set(const struct nft_ctx *ctx, struct nft_set *set)
5327 if (nft_set_is_anonymous(set)) {
5328 if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
5329 nft_map_activate(ctx, set);
5331 nft_clear(ctx->net, set);
5336 EXPORT_SYMBOL_GPL(nf_tables_activate_set);
5338 void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set,
5339 struct nft_set_binding *binding,
5340 enum nft_trans_phase phase)
5343 case NFT_TRANS_PREPARE_ERROR:
5344 nft_set_trans_unbind(ctx, set);
5345 if (nft_set_is_anonymous(set))
5346 nft_deactivate_next(ctx->net, set);
5348 list_del_rcu(&binding->list);
5352 case NFT_TRANS_PREPARE:
5353 if (nft_set_is_anonymous(set)) {
5354 if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
5355 nft_map_deactivate(ctx, set);
5357 nft_deactivate_next(ctx->net, set);
5361 case NFT_TRANS_ABORT:
5362 case NFT_TRANS_RELEASE:
5363 if (nft_set_is_anonymous(set) &&
5364 set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
5365 nft_map_deactivate(ctx, set);
5370 nf_tables_unbind_set(ctx, set, binding,
5371 phase == NFT_TRANS_COMMIT);
5374 EXPORT_SYMBOL_GPL(nf_tables_deactivate_set);
5376 void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set)
5378 if (list_empty(&set->bindings) && nft_set_is_anonymous(set))
5379 nft_set_destroy(ctx, set);
5381 EXPORT_SYMBOL_GPL(nf_tables_destroy_set);
5383 const struct nft_set_ext_type nft_set_ext_types[] = {
5384 [NFT_SET_EXT_KEY] = {
5385 .align = __alignof__(u32),
5387 [NFT_SET_EXT_DATA] = {
5388 .align = __alignof__(u32),
5390 [NFT_SET_EXT_EXPRESSIONS] = {
5391 .align = __alignof__(struct nft_set_elem_expr),
5393 [NFT_SET_EXT_OBJREF] = {
5394 .len = sizeof(struct nft_object *),
5395 .align = __alignof__(struct nft_object *),
5397 [NFT_SET_EXT_FLAGS] = {
5399 .align = __alignof__(u8),
5401 [NFT_SET_EXT_TIMEOUT] = {
5403 .align = __alignof__(u64),
5405 [NFT_SET_EXT_EXPIRATION] = {
5407 .align = __alignof__(u64),
5409 [NFT_SET_EXT_USERDATA] = {
5410 .len = sizeof(struct nft_userdata),
5411 .align = __alignof__(struct nft_userdata),
5413 [NFT_SET_EXT_KEY_END] = {
5414 .align = __alignof__(u32),
5422 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
5423 [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED },
5424 [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED },
5425 [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 },
5426 [NFTA_SET_ELEM_TIMEOUT] = { .type = NLA_U64 },
5427 [NFTA_SET_ELEM_EXPIRATION] = { .type = NLA_U64 },
5428 [NFTA_SET_ELEM_USERDATA] = { .type = NLA_BINARY,
5429 .len = NFT_USERDATA_MAXLEN },
5430 [NFTA_SET_ELEM_EXPR] = { .type = NLA_NESTED },
5431 [NFTA_SET_ELEM_OBJREF] = { .type = NLA_STRING,
5432 .len = NFT_OBJ_MAXNAMELEN - 1 },
5433 [NFTA_SET_ELEM_KEY_END] = { .type = NLA_NESTED },
5434 [NFTA_SET_ELEM_EXPRESSIONS] = { .type = NLA_NESTED },
5437 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
5438 [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING,
5439 .len = NFT_TABLE_MAXNAMELEN - 1 },
5440 [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING,
5441 .len = NFT_SET_MAXNAMELEN - 1 },
5442 [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED },
5443 [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 },
5446 static int nft_set_elem_expr_dump(struct sk_buff *skb,
5447 const struct nft_set *set,
5448 const struct nft_set_ext *ext,
5451 struct nft_set_elem_expr *elem_expr;
5452 u32 size, num_exprs = 0;
5453 struct nft_expr *expr;
5454 struct nlattr *nest;
5456 elem_expr = nft_set_ext_expr(ext);
5457 nft_setelem_expr_foreach(expr, elem_expr, size)
5460 if (num_exprs == 1) {
5461 expr = nft_setelem_expr_at(elem_expr, 0);
5462 if (nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, expr, reset) < 0)
5466 } else if (num_exprs > 1) {
5467 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_EXPRESSIONS);
5469 goto nla_put_failure;
5471 nft_setelem_expr_foreach(expr, elem_expr, size) {
5472 expr = nft_setelem_expr_at(elem_expr, size);
5473 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr, reset) < 0)
5474 goto nla_put_failure;
5476 nla_nest_end(skb, nest);
5484 static int nf_tables_fill_setelem(struct sk_buff *skb,
5485 const struct nft_set *set,
5486 const struct nft_set_elem *elem,
5489 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5490 unsigned char *b = skb_tail_pointer(skb);
5491 struct nlattr *nest;
5494 nest = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
5496 goto nla_put_failure;
5498 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) &&
5499 nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
5500 NFT_DATA_VALUE, set->klen) < 0)
5501 goto nla_put_failure;
5503 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
5504 nft_data_dump(skb, NFTA_SET_ELEM_KEY_END, nft_set_ext_key_end(ext),
5505 NFT_DATA_VALUE, set->klen) < 0)
5506 goto nla_put_failure;
5508 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
5509 nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
5510 set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
5512 goto nla_put_failure;
5514 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS) &&
5515 nft_set_elem_expr_dump(skb, set, ext, reset))
5516 goto nla_put_failure;
5518 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
5519 nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
5520 (*nft_set_ext_obj(ext))->key.name) < 0)
5521 goto nla_put_failure;
5523 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
5524 nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
5525 htonl(*nft_set_ext_flags(ext))))
5526 goto nla_put_failure;
5528 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT)) {
5529 timeout = *nft_set_ext_timeout(ext);
5530 if (nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
5531 nf_jiffies64_to_msecs(timeout),
5533 goto nla_put_failure;
5534 } else if (set->flags & NFT_SET_TIMEOUT) {
5535 timeout = READ_ONCE(set->timeout);
5538 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
5539 u64 expires, now = get_jiffies_64();
5541 expires = *nft_set_ext_expiration(ext);
5542 if (time_before64(now, expires))
5547 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
5548 nf_jiffies64_to_msecs(expires),
5550 goto nla_put_failure;
5553 *nft_set_ext_expiration(ext) = now + timeout;
5556 if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
5557 struct nft_userdata *udata;
5559 udata = nft_set_ext_userdata(ext);
5560 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
5561 udata->len + 1, udata->data))
5562 goto nla_put_failure;
5565 nla_nest_end(skb, nest);
5573 struct nft_set_dump_args {
5574 const struct netlink_callback *cb;
5575 struct nft_set_iter iter;
5576 struct sk_buff *skb;
5580 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
5581 struct nft_set *set,
5582 const struct nft_set_iter *iter,
5583 struct nft_set_elem *elem)
5585 struct nft_set_dump_args *args;
5587 args = container_of(iter, struct nft_set_dump_args, iter);
5588 return nf_tables_fill_setelem(args->skb, set, elem, args->reset);
5591 struct nft_set_dump_ctx {
5592 const struct nft_set *set;
5596 static int nft_set_catchall_dump(struct net *net, struct sk_buff *skb,
5597 const struct nft_set *set, bool reset)
5599 struct nft_set_elem_catchall *catchall;
5600 u8 genmask = nft_genmask_cur(net);
5601 struct nft_set_elem elem;
5602 struct nft_set_ext *ext;
5605 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5606 ext = nft_set_elem_ext(set, catchall->elem);
5607 if (!nft_set_elem_active(ext, genmask) ||
5608 nft_set_elem_expired(ext))
5611 elem.priv = catchall->elem;
5612 ret = nf_tables_fill_setelem(skb, set, &elem, reset);
5619 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
5621 struct nft_set_dump_ctx *dump_ctx = cb->data;
5622 struct net *net = sock_net(skb->sk);
5623 struct nftables_pernet *nft_net;
5624 struct nft_table *table;
5625 struct nft_set *set;
5626 struct nft_set_dump_args args;
5627 bool set_found = false;
5628 struct nlmsghdr *nlh;
5629 struct nlattr *nest;
5635 nft_net = nft_pernet(net);
5636 cb->seq = READ_ONCE(nft_net->base_seq);
5638 list_for_each_entry_rcu(table, &nft_net->tables, list) {
5639 if (dump_ctx->ctx.family != NFPROTO_UNSPEC &&
5640 dump_ctx->ctx.family != table->family)
5643 if (table != dump_ctx->ctx.table)
5646 list_for_each_entry_rcu(set, &table->sets, list) {
5647 if (set == dump_ctx->set) {
5660 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM);
5661 portid = NETLINK_CB(cb->skb).portid;
5662 seq = cb->nlh->nlmsg_seq;
5664 nlh = nfnl_msg_put(skb, portid, seq, event, NLM_F_MULTI,
5665 table->family, NFNETLINK_V0, nft_base_seq(net));
5667 goto nla_put_failure;
5669 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name))
5670 goto nla_put_failure;
5671 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
5672 goto nla_put_failure;
5674 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
5676 goto nla_put_failure;
5678 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETSETELEM_RESET)
5684 args.iter.genmask = nft_genmask_cur(net);
5685 args.iter.skip = cb->args[0];
5686 args.iter.count = 0;
5688 args.iter.fn = nf_tables_dump_setelem;
5689 set->ops->walk(&dump_ctx->ctx, set, &args.iter);
5691 if (!args.iter.err && args.iter.count == cb->args[0])
5692 args.iter.err = nft_set_catchall_dump(net, skb, set, reset);
5695 nla_nest_end(skb, nest);
5696 nlmsg_end(skb, nlh);
5698 if (args.iter.err && args.iter.err != -EMSGSIZE)
5699 return args.iter.err;
5700 if (args.iter.count == cb->args[0])
5703 cb->args[0] = args.iter.count;
5711 static int nf_tables_dump_set_start(struct netlink_callback *cb)
5713 struct nft_set_dump_ctx *dump_ctx = cb->data;
5715 cb->data = kmemdup(dump_ctx, sizeof(*dump_ctx), GFP_ATOMIC);
5717 return cb->data ? 0 : -ENOMEM;
5720 static int nf_tables_dump_set_done(struct netlink_callback *cb)
5726 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
5727 const struct nft_ctx *ctx, u32 seq,
5728 u32 portid, int event, u16 flags,
5729 const struct nft_set *set,
5730 const struct nft_set_elem *elem,
5733 struct nlmsghdr *nlh;
5734 struct nlattr *nest;
5737 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
5738 nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
5739 NFNETLINK_V0, nft_base_seq(ctx->net));
5741 goto nla_put_failure;
5743 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
5744 goto nla_put_failure;
5745 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
5746 goto nla_put_failure;
5748 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
5750 goto nla_put_failure;
5752 err = nf_tables_fill_setelem(skb, set, elem, reset);
5754 goto nla_put_failure;
5756 nla_nest_end(skb, nest);
5758 nlmsg_end(skb, nlh);
5762 nlmsg_trim(skb, nlh);
5766 static int nft_setelem_parse_flags(const struct nft_set *set,
5767 const struct nlattr *attr, u32 *flags)
5772 *flags = ntohl(nla_get_be32(attr));
5773 if (*flags & ~(NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL))
5775 if (!(set->flags & NFT_SET_INTERVAL) &&
5776 *flags & NFT_SET_ELEM_INTERVAL_END)
5778 if ((*flags & (NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL)) ==
5779 (NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL))
5785 static int nft_setelem_parse_key(struct nft_ctx *ctx, struct nft_set *set,
5786 struct nft_data *key, struct nlattr *attr)
5788 struct nft_data_desc desc = {
5789 .type = NFT_DATA_VALUE,
5790 .size = NFT_DATA_VALUE_MAXLEN,
5794 return nft_data_init(ctx, key, &desc, attr);
5797 static int nft_setelem_parse_data(struct nft_ctx *ctx, struct nft_set *set,
5798 struct nft_data_desc *desc,
5799 struct nft_data *data,
5800 struct nlattr *attr)
5804 if (set->dtype == NFT_DATA_VERDICT)
5805 dtype = NFT_DATA_VERDICT;
5807 dtype = NFT_DATA_VALUE;
5810 desc->size = NFT_DATA_VALUE_MAXLEN;
5811 desc->len = set->dlen;
5812 desc->flags = NFT_DATA_DESC_SETELEM;
5814 return nft_data_init(ctx, data, desc, attr);
5817 static void *nft_setelem_catchall_get(const struct net *net,
5818 const struct nft_set *set)
5820 struct nft_set_elem_catchall *catchall;
5821 u8 genmask = nft_genmask_cur(net);
5822 struct nft_set_ext *ext;
5825 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5826 ext = nft_set_elem_ext(set, catchall->elem);
5827 if (!nft_set_elem_active(ext, genmask) ||
5828 nft_set_elem_expired(ext))
5831 priv = catchall->elem;
5838 static int nft_setelem_get(struct nft_ctx *ctx, struct nft_set *set,
5839 struct nft_set_elem *elem, u32 flags)
5843 if (!(flags & NFT_SET_ELEM_CATCHALL)) {
5844 priv = set->ops->get(ctx->net, set, elem, flags);
5846 return PTR_ERR(priv);
5848 priv = nft_setelem_catchall_get(ctx->net, set);
5857 static int nft_get_set_elem(struct nft_ctx *ctx, struct nft_set *set,
5858 const struct nlattr *attr, bool reset)
5860 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
5861 struct nft_set_elem elem;
5862 struct sk_buff *skb;
5866 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
5867 nft_set_elem_policy, NULL);
5871 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
5875 if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
5878 if (nla[NFTA_SET_ELEM_KEY]) {
5879 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
5880 nla[NFTA_SET_ELEM_KEY]);
5885 if (nla[NFTA_SET_ELEM_KEY_END]) {
5886 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
5887 nla[NFTA_SET_ELEM_KEY_END]);
5892 err = nft_setelem_get(ctx, set, &elem, flags);
5897 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
5901 err = nf_tables_fill_setelem_info(skb, ctx, ctx->seq, ctx->portid,
5902 NFT_MSG_NEWSETELEM, 0, set, &elem,
5905 goto err_fill_setelem;
5907 return nfnetlink_unicast(skb, ctx->net, ctx->portid);
5914 /* called with rcu_read_lock held */
5915 static int nf_tables_getsetelem(struct sk_buff *skb,
5916 const struct nfnl_info *info,
5917 const struct nlattr * const nla[])
5919 struct netlink_ext_ack *extack = info->extack;
5920 u8 genmask = nft_genmask_cur(info->net);
5921 u8 family = info->nfmsg->nfgen_family;
5922 struct net *net = info->net;
5923 struct nft_table *table;
5924 struct nft_set *set;
5925 struct nlattr *attr;
5930 table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
5932 if (IS_ERR(table)) {
5933 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
5934 return PTR_ERR(table);
5937 set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
5939 return PTR_ERR(set);
5941 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
5943 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
5944 struct netlink_dump_control c = {
5945 .start = nf_tables_dump_set_start,
5946 .dump = nf_tables_dump_set,
5947 .done = nf_tables_dump_set_done,
5948 .module = THIS_MODULE,
5950 struct nft_set_dump_ctx dump_ctx = {
5956 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
5959 if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
5962 if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_GETSETELEM_RESET)
5965 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
5966 err = nft_get_set_elem(&ctx, set, attr, reset);
5968 NL_SET_BAD_ATTR(extack, attr);
5976 static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
5977 const struct nft_set *set,
5978 const struct nft_set_elem *elem,
5981 struct nftables_pernet *nft_net;
5982 struct net *net = ctx->net;
5983 u32 portid = ctx->portid;
5984 struct sk_buff *skb;
5988 if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
5991 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
5995 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
5996 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
5998 err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
6005 nft_net = nft_pernet(net);
6006 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
6009 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
6012 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
6014 struct nft_set *set)
6016 struct nft_trans *trans;
6018 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
6022 nft_trans_elem_set(trans) = set;
6026 struct nft_expr *nft_set_elem_expr_alloc(const struct nft_ctx *ctx,
6027 const struct nft_set *set,
6028 const struct nlattr *attr)
6030 struct nft_expr *expr;
6033 expr = nft_expr_init(ctx, attr);
6038 if (expr->ops->type->flags & NFT_EXPR_GC) {
6039 if (set->flags & NFT_SET_TIMEOUT)
6040 goto err_set_elem_expr;
6041 if (!set->ops->gc_init)
6042 goto err_set_elem_expr;
6043 set->ops->gc_init(set);
6049 nft_expr_destroy(ctx, expr);
6050 return ERR_PTR(err);
6053 static int nft_set_ext_check(const struct nft_set_ext_tmpl *tmpl, u8 id, u32 len)
6055 len += nft_set_ext_types[id].len;
6056 if (len > tmpl->ext_len[id] ||
6063 static int nft_set_ext_memcpy(const struct nft_set_ext_tmpl *tmpl, u8 id,
6064 void *to, const void *from, u32 len)
6066 if (nft_set_ext_check(tmpl, id, len) < 0)
6069 memcpy(to, from, len);
6074 void *nft_set_elem_init(const struct nft_set *set,
6075 const struct nft_set_ext_tmpl *tmpl,
6076 const u32 *key, const u32 *key_end,
6077 const u32 *data, u64 timeout, u64 expiration, gfp_t gfp)
6079 struct nft_set_ext *ext;
6082 elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
6084 return ERR_PTR(-ENOMEM);
6086 ext = nft_set_elem_ext(set, elem);
6087 nft_set_ext_init(ext, tmpl);
6089 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) &&
6090 nft_set_ext_memcpy(tmpl, NFT_SET_EXT_KEY,
6091 nft_set_ext_key(ext), key, set->klen) < 0)
6094 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
6095 nft_set_ext_memcpy(tmpl, NFT_SET_EXT_KEY_END,
6096 nft_set_ext_key_end(ext), key_end, set->klen) < 0)
6099 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
6100 nft_set_ext_memcpy(tmpl, NFT_SET_EXT_DATA,
6101 nft_set_ext_data(ext), data, set->dlen) < 0)
6104 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
6105 *nft_set_ext_expiration(ext) = get_jiffies_64() + expiration;
6106 if (expiration == 0)
6107 *nft_set_ext_expiration(ext) += timeout;
6109 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
6110 *nft_set_ext_timeout(ext) = timeout;
6117 return ERR_PTR(-EINVAL);
6120 static void __nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
6121 struct nft_expr *expr)
6123 if (expr->ops->destroy_clone) {
6124 expr->ops->destroy_clone(ctx, expr);
6125 module_put(expr->ops->type->owner);
6127 nf_tables_expr_destroy(ctx, expr);
6131 static void nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
6132 struct nft_set_elem_expr *elem_expr)
6134 struct nft_expr *expr;
6137 nft_setelem_expr_foreach(expr, elem_expr, size)
6138 __nft_set_elem_expr_destroy(ctx, expr);
6141 /* Drop references and destroy. Called from gc, dynset and abort path. */
6142 void nft_set_elem_destroy(const struct nft_set *set, void *elem,
6145 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
6146 struct nft_ctx ctx = {
6147 .net = read_pnet(&set->net),
6148 .family = set->table->family,
6151 nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE);
6152 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6153 nft_data_release(nft_set_ext_data(ext), set->dtype);
6154 if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
6155 nft_set_elem_expr_destroy(&ctx, nft_set_ext_expr(ext));
6157 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6158 (*nft_set_ext_obj(ext))->use--;
6161 EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
6163 /* Destroy element. References have been already dropped in the preparation
6164 * path via nft_setelem_data_deactivate().
6166 void nf_tables_set_elem_destroy(const struct nft_ctx *ctx,
6167 const struct nft_set *set, void *elem)
6169 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
6171 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
6172 nft_set_elem_expr_destroy(ctx, nft_set_ext_expr(ext));
6177 int nft_set_elem_expr_clone(const struct nft_ctx *ctx, struct nft_set *set,
6178 struct nft_expr *expr_array[])
6180 struct nft_expr *expr;
6183 for (i = 0; i < set->num_exprs; i++) {
6184 expr = kzalloc(set->exprs[i]->ops->size, GFP_KERNEL_ACCOUNT);
6188 err = nft_expr_clone(expr, set->exprs[i]);
6193 expr_array[i] = expr;
6199 for (k = i - 1; k >= 0; k--)
6200 nft_expr_destroy(ctx, expr_array[k]);
6205 static int nft_set_elem_expr_setup(struct nft_ctx *ctx,
6206 const struct nft_set_ext_tmpl *tmpl,
6207 const struct nft_set_ext *ext,
6208 struct nft_expr *expr_array[],
6211 struct nft_set_elem_expr *elem_expr = nft_set_ext_expr(ext);
6212 u32 len = sizeof(struct nft_set_elem_expr);
6213 struct nft_expr *expr;
6219 for (i = 0; i < num_exprs; i++)
6220 len += expr_array[i]->ops->size;
6222 if (nft_set_ext_check(tmpl, NFT_SET_EXT_EXPRESSIONS, len) < 0)
6225 for (i = 0; i < num_exprs; i++) {
6226 expr = nft_setelem_expr_at(elem_expr, elem_expr->size);
6227 err = nft_expr_clone(expr, expr_array[i]);
6229 goto err_elem_expr_setup;
6231 elem_expr->size += expr_array[i]->ops->size;
6232 nft_expr_destroy(ctx, expr_array[i]);
6233 expr_array[i] = NULL;
6238 err_elem_expr_setup:
6239 for (; i < num_exprs; i++) {
6240 nft_expr_destroy(ctx, expr_array[i]);
6241 expr_array[i] = NULL;
6247 struct nft_set_ext *nft_set_catchall_lookup(const struct net *net,
6248 const struct nft_set *set)
6250 struct nft_set_elem_catchall *catchall;
6251 u8 genmask = nft_genmask_cur(net);
6252 struct nft_set_ext *ext;
6254 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
6255 ext = nft_set_elem_ext(set, catchall->elem);
6256 if (nft_set_elem_active(ext, genmask) &&
6257 !nft_set_elem_expired(ext))
6263 EXPORT_SYMBOL_GPL(nft_set_catchall_lookup);
6265 void *nft_set_catchall_gc(const struct nft_set *set)
6267 struct nft_set_elem_catchall *catchall, *next;
6268 struct nft_set_ext *ext;
6271 list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
6272 ext = nft_set_elem_ext(set, catchall->elem);
6274 if (!nft_set_elem_expired(ext) ||
6275 nft_set_elem_mark_busy(ext))
6278 elem = catchall->elem;
6279 list_del_rcu(&catchall->list);
6280 kfree_rcu(catchall, rcu);
6286 EXPORT_SYMBOL_GPL(nft_set_catchall_gc);
6288 static int nft_setelem_catchall_insert(const struct net *net,
6289 struct nft_set *set,
6290 const struct nft_set_elem *elem,
6291 struct nft_set_ext **pext)
6293 struct nft_set_elem_catchall *catchall;
6294 u8 genmask = nft_genmask_next(net);
6295 struct nft_set_ext *ext;
6297 list_for_each_entry(catchall, &set->catchall_list, list) {
6298 ext = nft_set_elem_ext(set, catchall->elem);
6299 if (nft_set_elem_active(ext, genmask)) {
6305 catchall = kmalloc(sizeof(*catchall), GFP_KERNEL);
6309 catchall->elem = elem->priv;
6310 list_add_tail_rcu(&catchall->list, &set->catchall_list);
6315 static int nft_setelem_insert(const struct net *net,
6316 struct nft_set *set,
6317 const struct nft_set_elem *elem,
6318 struct nft_set_ext **ext, unsigned int flags)
6322 if (flags & NFT_SET_ELEM_CATCHALL)
6323 ret = nft_setelem_catchall_insert(net, set, elem, ext);
6325 ret = set->ops->insert(net, set, elem, ext);
6330 static bool nft_setelem_is_catchall(const struct nft_set *set,
6331 const struct nft_set_elem *elem)
6333 struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6335 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
6336 *nft_set_ext_flags(ext) & NFT_SET_ELEM_CATCHALL)
6342 static void nft_setelem_activate(struct net *net, struct nft_set *set,
6343 struct nft_set_elem *elem)
6345 struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6347 if (nft_setelem_is_catchall(set, elem)) {
6348 nft_set_elem_change_active(net, set, ext);
6349 nft_set_elem_clear_busy(ext);
6351 set->ops->activate(net, set, elem);
6355 static int nft_setelem_catchall_deactivate(const struct net *net,
6356 struct nft_set *set,
6357 struct nft_set_elem *elem)
6359 struct nft_set_elem_catchall *catchall;
6360 struct nft_set_ext *ext;
6362 list_for_each_entry(catchall, &set->catchall_list, list) {
6363 ext = nft_set_elem_ext(set, catchall->elem);
6364 if (!nft_is_active(net, ext) ||
6365 nft_set_elem_mark_busy(ext))
6369 elem->priv = catchall->elem;
6370 nft_set_elem_change_active(net, set, ext);
6377 static int __nft_setelem_deactivate(const struct net *net,
6378 struct nft_set *set,
6379 struct nft_set_elem *elem)
6383 priv = set->ops->deactivate(net, set, elem);
6394 static int nft_setelem_deactivate(const struct net *net,
6395 struct nft_set *set,
6396 struct nft_set_elem *elem, u32 flags)
6400 if (flags & NFT_SET_ELEM_CATCHALL)
6401 ret = nft_setelem_catchall_deactivate(net, set, elem);
6403 ret = __nft_setelem_deactivate(net, set, elem);
6408 static void nft_setelem_catchall_remove(const struct net *net,
6409 const struct nft_set *set,
6410 const struct nft_set_elem *elem)
6412 struct nft_set_elem_catchall *catchall, *next;
6414 list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
6415 if (catchall->elem == elem->priv) {
6416 list_del_rcu(&catchall->list);
6417 kfree_rcu(catchall, rcu);
6423 static void nft_setelem_remove(const struct net *net,
6424 const struct nft_set *set,
6425 const struct nft_set_elem *elem)
6427 if (nft_setelem_is_catchall(set, elem))
6428 nft_setelem_catchall_remove(net, set, elem);
6430 set->ops->remove(net, set, elem);
6433 static bool nft_setelem_valid_key_end(const struct nft_set *set,
6434 struct nlattr **nla, u32 flags)
6436 if ((set->flags & (NFT_SET_CONCAT | NFT_SET_INTERVAL)) ==
6437 (NFT_SET_CONCAT | NFT_SET_INTERVAL)) {
6438 if (flags & NFT_SET_ELEM_INTERVAL_END)
6441 if (nla[NFTA_SET_ELEM_KEY_END] &&
6442 flags & NFT_SET_ELEM_CATCHALL)
6445 if (nla[NFTA_SET_ELEM_KEY_END])
6452 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
6453 const struct nlattr *attr, u32 nlmsg_flags)
6455 struct nft_expr *expr_array[NFT_SET_EXPR_MAX] = {};
6456 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
6457 u8 genmask = nft_genmask_next(ctx->net);
6458 u32 flags = 0, size = 0, num_exprs = 0;
6459 struct nft_set_ext_tmpl tmpl;
6460 struct nft_set_ext *ext, *ext2;
6461 struct nft_set_elem elem;
6462 struct nft_set_binding *binding;
6463 struct nft_object *obj = NULL;
6464 struct nft_userdata *udata;
6465 struct nft_data_desc desc;
6466 enum nft_registers dreg;
6467 struct nft_trans *trans;
6473 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
6474 nft_set_elem_policy, NULL);
6478 nft_set_ext_prepare(&tmpl);
6480 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
6484 if (((flags & NFT_SET_ELEM_CATCHALL) && nla[NFTA_SET_ELEM_KEY]) ||
6485 (!(flags & NFT_SET_ELEM_CATCHALL) && !nla[NFTA_SET_ELEM_KEY]))
6489 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
6494 if (set->flags & NFT_SET_MAP) {
6495 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
6496 !(flags & NFT_SET_ELEM_INTERVAL_END))
6499 if (nla[NFTA_SET_ELEM_DATA] != NULL)
6503 if (set->flags & NFT_SET_OBJECT) {
6504 if (!nla[NFTA_SET_ELEM_OBJREF] &&
6505 !(flags & NFT_SET_ELEM_INTERVAL_END))
6508 if (nla[NFTA_SET_ELEM_OBJREF])
6512 if (!nft_setelem_valid_key_end(set, nla, flags))
6515 if ((flags & NFT_SET_ELEM_INTERVAL_END) &&
6516 (nla[NFTA_SET_ELEM_DATA] ||
6517 nla[NFTA_SET_ELEM_OBJREF] ||
6518 nla[NFTA_SET_ELEM_TIMEOUT] ||
6519 nla[NFTA_SET_ELEM_EXPIRATION] ||
6520 nla[NFTA_SET_ELEM_USERDATA] ||
6521 nla[NFTA_SET_ELEM_EXPR] ||
6522 nla[NFTA_SET_ELEM_KEY_END] ||
6523 nla[NFTA_SET_ELEM_EXPRESSIONS]))
6527 if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
6528 if (!(set->flags & NFT_SET_TIMEOUT))
6530 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_TIMEOUT],
6534 } else if (set->flags & NFT_SET_TIMEOUT &&
6535 !(flags & NFT_SET_ELEM_INTERVAL_END)) {
6536 timeout = READ_ONCE(set->timeout);
6540 if (nla[NFTA_SET_ELEM_EXPIRATION] != NULL) {
6541 if (!(set->flags & NFT_SET_TIMEOUT))
6543 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_EXPIRATION],
6549 if (nla[NFTA_SET_ELEM_EXPR]) {
6550 struct nft_expr *expr;
6552 if (set->num_exprs && set->num_exprs != 1)
6555 expr = nft_set_elem_expr_alloc(ctx, set,
6556 nla[NFTA_SET_ELEM_EXPR]);
6558 return PTR_ERR(expr);
6560 expr_array[0] = expr;
6563 if (set->num_exprs && set->exprs[0]->ops != expr->ops) {
6565 goto err_set_elem_expr;
6567 } else if (nla[NFTA_SET_ELEM_EXPRESSIONS]) {
6568 struct nft_expr *expr;
6573 nla_for_each_nested(tmp, nla[NFTA_SET_ELEM_EXPRESSIONS], left) {
6574 if (i == NFT_SET_EXPR_MAX ||
6575 (set->num_exprs && set->num_exprs == i)) {
6577 goto err_set_elem_expr;
6579 if (nla_type(tmp) != NFTA_LIST_ELEM) {
6581 goto err_set_elem_expr;
6583 expr = nft_set_elem_expr_alloc(ctx, set, tmp);
6585 err = PTR_ERR(expr);
6586 goto err_set_elem_expr;
6588 expr_array[i] = expr;
6591 if (set->num_exprs && expr->ops != set->exprs[i]->ops) {
6593 goto err_set_elem_expr;
6597 if (set->num_exprs && set->num_exprs != i) {
6599 goto err_set_elem_expr;
6601 } else if (set->num_exprs > 0 &&
6602 !(flags & NFT_SET_ELEM_INTERVAL_END)) {
6603 err = nft_set_elem_expr_clone(ctx, set, expr_array);
6605 goto err_set_elem_expr_clone;
6607 num_exprs = set->num_exprs;
6610 if (nla[NFTA_SET_ELEM_KEY]) {
6611 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
6612 nla[NFTA_SET_ELEM_KEY]);
6614 goto err_set_elem_expr;
6616 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
6621 if (nla[NFTA_SET_ELEM_KEY_END]) {
6622 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
6623 nla[NFTA_SET_ELEM_KEY_END]);
6627 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
6629 goto err_parse_key_end;
6633 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
6635 goto err_parse_key_end;
6637 if (timeout != READ_ONCE(set->timeout)) {
6638 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
6640 goto err_parse_key_end;
6645 for (i = 0; i < num_exprs; i++)
6646 size += expr_array[i]->ops->size;
6648 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_EXPRESSIONS,
6649 sizeof(struct nft_set_elem_expr) + size);
6651 goto err_parse_key_end;
6654 if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
6655 obj = nft_obj_lookup(ctx->net, ctx->table,
6656 nla[NFTA_SET_ELEM_OBJREF],
6657 set->objtype, genmask);
6660 goto err_parse_key_end;
6662 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
6664 goto err_parse_key_end;
6667 if (nla[NFTA_SET_ELEM_DATA] != NULL) {
6668 err = nft_setelem_parse_data(ctx, set, &desc, &elem.data.val,
6669 nla[NFTA_SET_ELEM_DATA]);
6671 goto err_parse_key_end;
6673 dreg = nft_type_to_reg(set->dtype);
6674 list_for_each_entry(binding, &set->bindings, list) {
6675 struct nft_ctx bind_ctx = {
6677 .family = ctx->family,
6678 .table = ctx->table,
6679 .chain = (struct nft_chain *)binding->chain,
6682 if (!(binding->flags & NFT_SET_MAP))
6685 err = nft_validate_register_store(&bind_ctx, dreg,
6687 desc.type, desc.len);
6689 goto err_parse_data;
6691 if (desc.type == NFT_DATA_VERDICT &&
6692 (elem.data.val.verdict.code == NFT_GOTO ||
6693 elem.data.val.verdict.code == NFT_JUMP))
6694 nft_validate_state_update(ctx->table,
6698 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, desc.len);
6700 goto err_parse_data;
6703 /* The full maximum length of userdata can exceed the maximum
6704 * offset value (U8_MAX) for following extensions, therefor it
6705 * must be the last extension added.
6708 if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
6709 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
6711 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
6714 goto err_parse_data;
6718 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
6719 elem.key_end.val.data, elem.data.val.data,
6720 timeout, expiration, GFP_KERNEL_ACCOUNT);
6721 if (IS_ERR(elem.priv)) {
6722 err = PTR_ERR(elem.priv);
6723 goto err_parse_data;
6726 ext = nft_set_elem_ext(set, elem.priv);
6728 *nft_set_ext_flags(ext) = flags;
6731 *nft_set_ext_obj(ext) = obj;
6735 if (nft_set_ext_check(&tmpl, NFT_SET_EXT_USERDATA, ulen) < 0) {
6739 udata = nft_set_ext_userdata(ext);
6740 udata->len = ulen - 1;
6741 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
6743 err = nft_set_elem_expr_setup(ctx, &tmpl, ext, expr_array, num_exprs);
6747 trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
6748 if (trans == NULL) {
6753 ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK;
6755 err = nft_setelem_insert(ctx->net, set, &elem, &ext2, flags);
6757 if (err == -EEXIST) {
6758 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^
6759 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) ||
6760 nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^
6761 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF))
6762 goto err_element_clash;
6763 if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
6764 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
6765 memcmp(nft_set_ext_data(ext),
6766 nft_set_ext_data(ext2), set->dlen) != 0) ||
6767 (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
6768 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
6769 *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
6770 goto err_element_clash;
6771 else if (!(nlmsg_flags & NLM_F_EXCL))
6773 } else if (err == -ENOTEMPTY) {
6774 /* ENOTEMPTY reports overlapping between this element
6775 * and an existing one.
6779 goto err_element_clash;
6782 if (!(flags & NFT_SET_ELEM_CATCHALL)) {
6783 unsigned int max = set->size ? set->size + set->ndeact : UINT_MAX;
6785 if (!atomic_add_unless(&set->nelems, 1, max)) {
6791 nft_trans_elem(trans) = elem;
6792 nft_trans_commit_list_add_tail(ctx->net, trans);
6796 nft_setelem_remove(ctx->net, set, &elem);
6800 nf_tables_set_elem_destroy(ctx, set, elem.priv);
6804 if (nla[NFTA_SET_ELEM_DATA] != NULL)
6805 nft_data_release(&elem.data.val, desc.type);
6807 nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
6809 nft_data_release(&elem.key.val, NFT_DATA_VALUE);
6811 for (i = 0; i < num_exprs && expr_array[i]; i++)
6812 nft_expr_destroy(ctx, expr_array[i]);
6813 err_set_elem_expr_clone:
6817 static int nf_tables_newsetelem(struct sk_buff *skb,
6818 const struct nfnl_info *info,
6819 const struct nlattr * const nla[])
6821 struct netlink_ext_ack *extack = info->extack;
6822 u8 genmask = nft_genmask_next(info->net);
6823 u8 family = info->nfmsg->nfgen_family;
6824 struct net *net = info->net;
6825 const struct nlattr *attr;
6826 struct nft_table *table;
6827 struct nft_set *set;
6831 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
6834 table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
6835 genmask, NETLINK_CB(skb).portid);
6836 if (IS_ERR(table)) {
6837 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
6838 return PTR_ERR(table);
6841 set = nft_set_lookup_global(net, table, nla[NFTA_SET_ELEM_LIST_SET],
6842 nla[NFTA_SET_ELEM_LIST_SET_ID], genmask);
6844 return PTR_ERR(set);
6846 if (!list_empty(&set->bindings) &&
6847 (set->flags & (NFT_SET_CONSTANT | NFT_SET_ANONYMOUS)))
6850 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6852 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
6853 err = nft_add_set_elem(&ctx, set, attr, info->nlh->nlmsg_flags);
6855 NL_SET_BAD_ATTR(extack, attr);
6860 if (table->validate_state == NFT_VALIDATE_DO)
6861 return nft_table_validate(net, table);
6867 * nft_data_hold - hold a nft_data item
6869 * @data: struct nft_data to release
6870 * @type: type of data
6872 * Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded,
6873 * NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and
6874 * NFT_GOTO verdicts. This function must be called on active data objects
6875 * from the second phase of the commit protocol.
6877 void nft_data_hold(const struct nft_data *data, enum nft_data_types type)
6879 struct nft_chain *chain;
6881 if (type == NFT_DATA_VERDICT) {
6882 switch (data->verdict.code) {
6885 chain = data->verdict.chain;
6892 static void nft_setelem_data_activate(const struct net *net,
6893 const struct nft_set *set,
6894 struct nft_set_elem *elem)
6896 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6898 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6899 nft_data_hold(nft_set_ext_data(ext), set->dtype);
6900 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6901 (*nft_set_ext_obj(ext))->use++;
6904 static void nft_setelem_data_deactivate(const struct net *net,
6905 const struct nft_set *set,
6906 struct nft_set_elem *elem)
6908 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6910 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6911 nft_data_release(nft_set_ext_data(ext), set->dtype);
6912 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6913 (*nft_set_ext_obj(ext))->use--;
6916 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
6917 const struct nlattr *attr)
6919 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
6920 struct nft_set_ext_tmpl tmpl;
6921 struct nft_set_elem elem;
6922 struct nft_set_ext *ext;
6923 struct nft_trans *trans;
6927 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
6928 nft_set_elem_policy, NULL);
6932 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
6936 if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
6939 if (!nft_setelem_valid_key_end(set, nla, flags))
6942 nft_set_ext_prepare(&tmpl);
6945 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
6950 if (nla[NFTA_SET_ELEM_KEY]) {
6951 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
6952 nla[NFTA_SET_ELEM_KEY]);
6956 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
6961 if (nla[NFTA_SET_ELEM_KEY_END]) {
6962 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
6963 nla[NFTA_SET_ELEM_KEY_END]);
6967 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
6969 goto fail_elem_key_end;
6973 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
6974 elem.key_end.val.data, NULL, 0, 0,
6975 GFP_KERNEL_ACCOUNT);
6976 if (IS_ERR(elem.priv)) {
6977 err = PTR_ERR(elem.priv);
6978 goto fail_elem_key_end;
6981 ext = nft_set_elem_ext(set, elem.priv);
6983 *nft_set_ext_flags(ext) = flags;
6985 trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
6989 err = nft_setelem_deactivate(ctx->net, set, &elem, flags);
6993 nft_setelem_data_deactivate(ctx->net, set, &elem);
6995 nft_trans_elem(trans) = elem;
6996 nft_trans_commit_list_add_tail(ctx->net, trans);
7004 nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
7006 nft_data_release(&elem.key.val, NFT_DATA_VALUE);
7010 static int nft_setelem_flush(const struct nft_ctx *ctx,
7011 struct nft_set *set,
7012 const struct nft_set_iter *iter,
7013 struct nft_set_elem *elem)
7015 struct nft_trans *trans;
7018 trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
7019 sizeof(struct nft_trans_elem), GFP_ATOMIC);
7023 if (!set->ops->flush(ctx->net, set, elem->priv)) {
7029 nft_setelem_data_deactivate(ctx->net, set, elem);
7030 nft_trans_elem_set(trans) = set;
7031 nft_trans_elem(trans) = *elem;
7032 nft_trans_commit_list_add_tail(ctx->net, trans);
7040 static int __nft_set_catchall_flush(const struct nft_ctx *ctx,
7041 struct nft_set *set,
7042 struct nft_set_elem *elem)
7044 struct nft_trans *trans;
7046 trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
7047 sizeof(struct nft_trans_elem), GFP_KERNEL);
7051 nft_setelem_data_deactivate(ctx->net, set, elem);
7052 nft_trans_elem_set(trans) = set;
7053 nft_trans_elem(trans) = *elem;
7054 nft_trans_commit_list_add_tail(ctx->net, trans);
7059 static int nft_set_catchall_flush(const struct nft_ctx *ctx,
7060 struct nft_set *set)
7062 u8 genmask = nft_genmask_next(ctx->net);
7063 struct nft_set_elem_catchall *catchall;
7064 struct nft_set_elem elem;
7065 struct nft_set_ext *ext;
7068 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
7069 ext = nft_set_elem_ext(set, catchall->elem);
7070 if (!nft_set_elem_active(ext, genmask) ||
7071 nft_set_elem_mark_busy(ext))
7074 elem.priv = catchall->elem;
7075 ret = __nft_set_catchall_flush(ctx, set, &elem);
7083 static int nft_set_flush(struct nft_ctx *ctx, struct nft_set *set, u8 genmask)
7085 struct nft_set_iter iter = {
7087 .fn = nft_setelem_flush,
7090 set->ops->walk(ctx, set, &iter);
7092 iter.err = nft_set_catchall_flush(ctx, set);
7097 static int nf_tables_delsetelem(struct sk_buff *skb,
7098 const struct nfnl_info *info,
7099 const struct nlattr * const nla[])
7101 struct netlink_ext_ack *extack = info->extack;
7102 u8 genmask = nft_genmask_next(info->net);
7103 u8 family = info->nfmsg->nfgen_family;
7104 struct net *net = info->net;
7105 const struct nlattr *attr;
7106 struct nft_table *table;
7107 struct nft_set *set;
7111 table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
7112 genmask, NETLINK_CB(skb).portid);
7113 if (IS_ERR(table)) {
7114 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
7115 return PTR_ERR(table);
7118 set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
7120 return PTR_ERR(set);
7122 if (!list_empty(&set->bindings) &&
7123 (set->flags & (NFT_SET_CONSTANT | NFT_SET_ANONYMOUS)))
7126 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7128 if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
7129 return nft_set_flush(&ctx, set, genmask);
7131 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
7132 err = nft_del_setelem(&ctx, set, attr);
7133 if (err == -ENOENT &&
7134 NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYSETELEM)
7138 NL_SET_BAD_ATTR(extack, attr);
7145 void nft_set_gc_batch_release(struct rcu_head *rcu)
7147 struct nft_set_gc_batch *gcb;
7150 gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu);
7151 for (i = 0; i < gcb->head.cnt; i++)
7152 nft_set_elem_destroy(gcb->head.set, gcb->elems[i], true);
7156 struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
7159 struct nft_set_gc_batch *gcb;
7161 gcb = kzalloc(sizeof(*gcb), gfp);
7164 gcb->head.set = set;
7173 * nft_register_obj- register nf_tables stateful object type
7174 * @obj_type: object type
7176 * Registers the object type for use with nf_tables. Returns zero on
7177 * success or a negative errno code otherwise.
7179 int nft_register_obj(struct nft_object_type *obj_type)
7181 if (obj_type->type == NFT_OBJECT_UNSPEC)
7184 nfnl_lock(NFNL_SUBSYS_NFTABLES);
7185 list_add_rcu(&obj_type->list, &nf_tables_objects);
7186 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7189 EXPORT_SYMBOL_GPL(nft_register_obj);
7192 * nft_unregister_obj - unregister nf_tables object type
7193 * @obj_type: object type
7195 * Unregisters the object type for use with nf_tables.
7197 void nft_unregister_obj(struct nft_object_type *obj_type)
7199 nfnl_lock(NFNL_SUBSYS_NFTABLES);
7200 list_del_rcu(&obj_type->list);
7201 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7203 EXPORT_SYMBOL_GPL(nft_unregister_obj);
7205 struct nft_object *nft_obj_lookup(const struct net *net,
7206 const struct nft_table *table,
7207 const struct nlattr *nla, u32 objtype,
7210 struct nft_object_hash_key k = { .table = table };
7211 char search[NFT_OBJ_MAXNAMELEN];
7212 struct rhlist_head *tmp, *list;
7213 struct nft_object *obj;
7215 nla_strscpy(search, nla, sizeof(search));
7218 WARN_ON_ONCE(!rcu_read_lock_held() &&
7219 !lockdep_commit_lock_is_held(net));
7222 list = rhltable_lookup(&nft_objname_ht, &k, nft_objname_ht_params);
7226 rhl_for_each_entry_rcu(obj, tmp, list, rhlhead) {
7227 if (objtype == obj->ops->type->type &&
7228 nft_active_genmask(obj, genmask)) {
7235 return ERR_PTR(-ENOENT);
7237 EXPORT_SYMBOL_GPL(nft_obj_lookup);
7239 static struct nft_object *nft_obj_lookup_byhandle(const struct nft_table *table,
7240 const struct nlattr *nla,
7241 u32 objtype, u8 genmask)
7243 struct nft_object *obj;
7245 list_for_each_entry(obj, &table->objects, list) {
7246 if (be64_to_cpu(nla_get_be64(nla)) == obj->handle &&
7247 objtype == obj->ops->type->type &&
7248 nft_active_genmask(obj, genmask))
7251 return ERR_PTR(-ENOENT);
7254 static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
7255 [NFTA_OBJ_TABLE] = { .type = NLA_STRING,
7256 .len = NFT_TABLE_MAXNAMELEN - 1 },
7257 [NFTA_OBJ_NAME] = { .type = NLA_STRING,
7258 .len = NFT_OBJ_MAXNAMELEN - 1 },
7259 [NFTA_OBJ_TYPE] = { .type = NLA_U32 },
7260 [NFTA_OBJ_DATA] = { .type = NLA_NESTED },
7261 [NFTA_OBJ_HANDLE] = { .type = NLA_U64},
7262 [NFTA_OBJ_USERDATA] = { .type = NLA_BINARY,
7263 .len = NFT_USERDATA_MAXLEN },
7266 static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,
7267 const struct nft_object_type *type,
7268 const struct nlattr *attr)
7271 const struct nft_object_ops *ops;
7272 struct nft_object *obj;
7275 tb = kmalloc_array(type->maxattr + 1, sizeof(*tb), GFP_KERNEL);
7280 err = nla_parse_nested_deprecated(tb, type->maxattr, attr,
7281 type->policy, NULL);
7285 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
7288 if (type->select_ops) {
7289 ops = type->select_ops(ctx, (const struct nlattr * const *)tb);
7299 obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL_ACCOUNT);
7303 err = ops->init(ctx, (const struct nlattr * const *)tb, obj);
7316 return ERR_PTR(err);
7319 static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
7320 struct nft_object *obj, bool reset)
7322 struct nlattr *nest;
7324 nest = nla_nest_start_noflag(skb, attr);
7326 goto nla_put_failure;
7327 if (obj->ops->dump(skb, obj, reset) < 0)
7328 goto nla_put_failure;
7329 nla_nest_end(skb, nest);
7336 static const struct nft_object_type *__nft_obj_type_get(u32 objtype)
7338 const struct nft_object_type *type;
7340 list_for_each_entry(type, &nf_tables_objects, list) {
7341 if (objtype == type->type)
7347 static const struct nft_object_type *
7348 nft_obj_type_get(struct net *net, u32 objtype)
7350 const struct nft_object_type *type;
7352 type = __nft_obj_type_get(objtype);
7353 if (type != NULL && try_module_get(type->owner))
7356 lockdep_nfnl_nft_mutex_not_held();
7357 #ifdef CONFIG_MODULES
7359 if (nft_request_module(net, "nft-obj-%u", objtype) == -EAGAIN)
7360 return ERR_PTR(-EAGAIN);
7363 return ERR_PTR(-ENOENT);
7366 static int nf_tables_updobj(const struct nft_ctx *ctx,
7367 const struct nft_object_type *type,
7368 const struct nlattr *attr,
7369 struct nft_object *obj)
7371 struct nft_object *newobj;
7372 struct nft_trans *trans;
7375 if (!try_module_get(type->owner))
7378 trans = nft_trans_alloc(ctx, NFT_MSG_NEWOBJ,
7379 sizeof(struct nft_trans_obj));
7383 newobj = nft_obj_init(ctx, type, attr);
7384 if (IS_ERR(newobj)) {
7385 err = PTR_ERR(newobj);
7386 goto err_free_trans;
7389 nft_trans_obj(trans) = obj;
7390 nft_trans_obj_update(trans) = true;
7391 nft_trans_obj_newobj(trans) = newobj;
7392 nft_trans_commit_list_add_tail(ctx->net, trans);
7399 module_put(type->owner);
7403 static int nf_tables_newobj(struct sk_buff *skb, const struct nfnl_info *info,
7404 const struct nlattr * const nla[])
7406 struct netlink_ext_ack *extack = info->extack;
7407 u8 genmask = nft_genmask_next(info->net);
7408 u8 family = info->nfmsg->nfgen_family;
7409 const struct nft_object_type *type;
7410 struct net *net = info->net;
7411 struct nft_table *table;
7412 struct nft_object *obj;
7417 if (!nla[NFTA_OBJ_TYPE] ||
7418 !nla[NFTA_OBJ_NAME] ||
7419 !nla[NFTA_OBJ_DATA])
7422 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
7423 NETLINK_CB(skb).portid);
7424 if (IS_ERR(table)) {
7425 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7426 return PTR_ERR(table);
7429 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7430 obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
7433 if (err != -ENOENT) {
7434 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7438 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
7439 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7442 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
7445 type = __nft_obj_type_get(objtype);
7446 if (WARN_ON_ONCE(!type))
7449 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7451 return nf_tables_updobj(&ctx, type, nla[NFTA_OBJ_DATA], obj);
7454 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7456 type = nft_obj_type_get(net, objtype);
7458 return PTR_ERR(type);
7460 obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]);
7465 obj->key.table = table;
7466 obj->handle = nf_tables_alloc_handle(table);
7468 obj->key.name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL_ACCOUNT);
7469 if (!obj->key.name) {
7474 if (nla[NFTA_OBJ_USERDATA]) {
7475 obj->udata = nla_memdup(nla[NFTA_OBJ_USERDATA], GFP_KERNEL_ACCOUNT);
7476 if (obj->udata == NULL)
7479 obj->udlen = nla_len(nla[NFTA_OBJ_USERDATA]);
7482 err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
7486 err = rhltable_insert(&nft_objname_ht, &obj->rhlhead,
7487 nft_objname_ht_params);
7491 list_add_tail_rcu(&obj->list, &table->objects);
7495 /* queued in transaction log */
7496 INIT_LIST_HEAD(&obj->list);
7501 kfree(obj->key.name);
7503 if (obj->ops->destroy)
7504 obj->ops->destroy(&ctx, obj);
7507 module_put(type->owner);
7511 static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
7512 u32 portid, u32 seq, int event, u32 flags,
7513 int family, const struct nft_table *table,
7514 struct nft_object *obj, bool reset)
7516 struct nlmsghdr *nlh;
7518 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
7519 nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
7520 NFNETLINK_V0, nft_base_seq(net));
7522 goto nla_put_failure;
7524 if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
7525 nla_put_string(skb, NFTA_OBJ_NAME, obj->key.name) ||
7526 nla_put_be64(skb, NFTA_OBJ_HANDLE, cpu_to_be64(obj->handle),
7528 goto nla_put_failure;
7530 if (event == NFT_MSG_DELOBJ) {
7531 nlmsg_end(skb, nlh);
7535 if (nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) ||
7536 nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
7537 nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset))
7538 goto nla_put_failure;
7541 nla_put(skb, NFTA_OBJ_USERDATA, obj->udlen, obj->udata))
7542 goto nla_put_failure;
7544 nlmsg_end(skb, nlh);
7548 nlmsg_trim(skb, nlh);
7552 struct nft_obj_filter {
7557 static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
7559 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
7560 const struct nft_table *table;
7561 unsigned int idx = 0, s_idx = cb->args[0];
7562 struct nft_obj_filter *filter = cb->data;
7563 struct net *net = sock_net(skb->sk);
7564 int family = nfmsg->nfgen_family;
7565 struct nftables_pernet *nft_net;
7566 struct nft_object *obj;
7569 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
7573 nft_net = nft_pernet(net);
7574 cb->seq = READ_ONCE(nft_net->base_seq);
7576 list_for_each_entry_rcu(table, &nft_net->tables, list) {
7577 if (family != NFPROTO_UNSPEC && family != table->family)
7580 list_for_each_entry_rcu(obj, &table->objects, list) {
7581 if (!nft_is_active(net, obj))
7586 memset(&cb->args[1], 0,
7587 sizeof(cb->args) - sizeof(cb->args[0]));
7588 if (filter && filter->table &&
7589 strcmp(filter->table, table->name))
7592 filter->type != NFT_OBJECT_UNSPEC &&
7593 obj->ops->type->type != filter->type)
7596 char *buf = kasprintf(GFP_ATOMIC,
7601 audit_log_nfcfg(buf,
7604 AUDIT_NFT_OP_OBJ_RESET,
7609 if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid,
7612 NLM_F_MULTI | NLM_F_APPEND,
7613 table->family, table,
7617 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7629 static int nf_tables_dump_obj_start(struct netlink_callback *cb)
7631 const struct nlattr * const *nla = cb->data;
7632 struct nft_obj_filter *filter = NULL;
7634 if (nla[NFTA_OBJ_TABLE] || nla[NFTA_OBJ_TYPE]) {
7635 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
7639 if (nla[NFTA_OBJ_TABLE]) {
7640 filter->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_ATOMIC);
7641 if (!filter->table) {
7647 if (nla[NFTA_OBJ_TYPE])
7648 filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7655 static int nf_tables_dump_obj_done(struct netlink_callback *cb)
7657 struct nft_obj_filter *filter = cb->data;
7660 kfree(filter->table);
7667 /* called with rcu_read_lock held */
7668 static int nf_tables_getobj(struct sk_buff *skb, const struct nfnl_info *info,
7669 const struct nlattr * const nla[])
7671 struct netlink_ext_ack *extack = info->extack;
7672 u8 genmask = nft_genmask_cur(info->net);
7673 u8 family = info->nfmsg->nfgen_family;
7674 const struct nft_table *table;
7675 struct net *net = info->net;
7676 struct nft_object *obj;
7677 struct sk_buff *skb2;
7682 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
7683 struct netlink_dump_control c = {
7684 .start = nf_tables_dump_obj_start,
7685 .dump = nf_tables_dump_obj,
7686 .done = nf_tables_dump_obj_done,
7687 .module = THIS_MODULE,
7688 .data = (void *)nla,
7691 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
7694 if (!nla[NFTA_OBJ_NAME] ||
7695 !nla[NFTA_OBJ_TYPE])
7698 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask, 0);
7699 if (IS_ERR(table)) {
7700 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7701 return PTR_ERR(table);
7704 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7705 obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
7707 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7708 return PTR_ERR(obj);
7711 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
7715 if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
7719 const struct nftables_pernet *nft_net;
7722 nft_net = nft_pernet(net);
7723 buf = kasprintf(GFP_ATOMIC, "%s:%u", table->name, nft_net->base_seq);
7725 audit_log_nfcfg(buf,
7728 AUDIT_NFT_OP_OBJ_RESET,
7733 err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
7734 info->nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
7735 family, table, obj, reset);
7737 goto err_fill_obj_info;
7739 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
7746 static void nft_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj)
7748 if (obj->ops->destroy)
7749 obj->ops->destroy(ctx, obj);
7751 module_put(obj->ops->type->owner);
7752 kfree(obj->key.name);
7757 static int nf_tables_delobj(struct sk_buff *skb, const struct nfnl_info *info,
7758 const struct nlattr * const nla[])
7760 struct netlink_ext_ack *extack = info->extack;
7761 u8 genmask = nft_genmask_next(info->net);
7762 u8 family = info->nfmsg->nfgen_family;
7763 struct net *net = info->net;
7764 const struct nlattr *attr;
7765 struct nft_table *table;
7766 struct nft_object *obj;
7770 if (!nla[NFTA_OBJ_TYPE] ||
7771 (!nla[NFTA_OBJ_NAME] && !nla[NFTA_OBJ_HANDLE]))
7774 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
7775 NETLINK_CB(skb).portid);
7776 if (IS_ERR(table)) {
7777 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7778 return PTR_ERR(table);
7781 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7782 if (nla[NFTA_OBJ_HANDLE]) {
7783 attr = nla[NFTA_OBJ_HANDLE];
7784 obj = nft_obj_lookup_byhandle(table, attr, objtype, genmask);
7786 attr = nla[NFTA_OBJ_NAME];
7787 obj = nft_obj_lookup(net, table, attr, objtype, genmask);
7791 if (PTR_ERR(obj) == -ENOENT &&
7792 NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYOBJ)
7795 NL_SET_BAD_ATTR(extack, attr);
7796 return PTR_ERR(obj);
7799 NL_SET_BAD_ATTR(extack, attr);
7803 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7805 return nft_delobj(&ctx, obj);
7808 void nft_obj_notify(struct net *net, const struct nft_table *table,
7809 struct nft_object *obj, u32 portid, u32 seq, int event,
7810 u16 flags, int family, int report, gfp_t gfp)
7812 struct nftables_pernet *nft_net = nft_pernet(net);
7813 struct sk_buff *skb;
7815 char *buf = kasprintf(gfp, "%s:%u",
7816 table->name, nft_net->base_seq);
7818 audit_log_nfcfg(buf,
7821 event == NFT_MSG_NEWOBJ ?
7822 AUDIT_NFT_OP_OBJ_REGISTER :
7823 AUDIT_NFT_OP_OBJ_UNREGISTER,
7828 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
7831 skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
7835 err = nf_tables_fill_obj_info(skb, net, portid, seq, event,
7836 flags & (NLM_F_CREATE | NLM_F_EXCL),
7837 family, table, obj, false);
7843 nft_notify_enqueue(skb, report, &nft_net->notify_list);
7846 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
7848 EXPORT_SYMBOL_GPL(nft_obj_notify);
7850 static void nf_tables_obj_notify(const struct nft_ctx *ctx,
7851 struct nft_object *obj, int event)
7853 nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid, ctx->seq, event,
7854 ctx->flags, ctx->family, ctx->report, GFP_KERNEL);
7860 void nft_register_flowtable_type(struct nf_flowtable_type *type)
7862 nfnl_lock(NFNL_SUBSYS_NFTABLES);
7863 list_add_tail_rcu(&type->list, &nf_tables_flowtables);
7864 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7866 EXPORT_SYMBOL_GPL(nft_register_flowtable_type);
7868 void nft_unregister_flowtable_type(struct nf_flowtable_type *type)
7870 nfnl_lock(NFNL_SUBSYS_NFTABLES);
7871 list_del_rcu(&type->list);
7872 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7874 EXPORT_SYMBOL_GPL(nft_unregister_flowtable_type);
7876 static const struct nla_policy nft_flowtable_policy[NFTA_FLOWTABLE_MAX + 1] = {
7877 [NFTA_FLOWTABLE_TABLE] = { .type = NLA_STRING,
7878 .len = NFT_NAME_MAXLEN - 1 },
7879 [NFTA_FLOWTABLE_NAME] = { .type = NLA_STRING,
7880 .len = NFT_NAME_MAXLEN - 1 },
7881 [NFTA_FLOWTABLE_HOOK] = { .type = NLA_NESTED },
7882 [NFTA_FLOWTABLE_HANDLE] = { .type = NLA_U64 },
7883 [NFTA_FLOWTABLE_FLAGS] = { .type = NLA_U32 },
7886 struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table,
7887 const struct nlattr *nla, u8 genmask)
7889 struct nft_flowtable *flowtable;
7891 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
7892 if (!nla_strcmp(nla, flowtable->name) &&
7893 nft_active_genmask(flowtable, genmask))
7896 return ERR_PTR(-ENOENT);
7898 EXPORT_SYMBOL_GPL(nft_flowtable_lookup);
7900 void nf_tables_deactivate_flowtable(const struct nft_ctx *ctx,
7901 struct nft_flowtable *flowtable,
7902 enum nft_trans_phase phase)
7905 case NFT_TRANS_PREPARE_ERROR:
7906 case NFT_TRANS_PREPARE:
7907 case NFT_TRANS_ABORT:
7908 case NFT_TRANS_RELEASE:
7915 EXPORT_SYMBOL_GPL(nf_tables_deactivate_flowtable);
7917 static struct nft_flowtable *
7918 nft_flowtable_lookup_byhandle(const struct nft_table *table,
7919 const struct nlattr *nla, u8 genmask)
7921 struct nft_flowtable *flowtable;
7923 list_for_each_entry(flowtable, &table->flowtables, list) {
7924 if (be64_to_cpu(nla_get_be64(nla)) == flowtable->handle &&
7925 nft_active_genmask(flowtable, genmask))
7928 return ERR_PTR(-ENOENT);
7931 struct nft_flowtable_hook {
7934 struct list_head list;
7937 static const struct nla_policy nft_flowtable_hook_policy[NFTA_FLOWTABLE_HOOK_MAX + 1] = {
7938 [NFTA_FLOWTABLE_HOOK_NUM] = { .type = NLA_U32 },
7939 [NFTA_FLOWTABLE_HOOK_PRIORITY] = { .type = NLA_U32 },
7940 [NFTA_FLOWTABLE_HOOK_DEVS] = { .type = NLA_NESTED },
7943 static int nft_flowtable_parse_hook(const struct nft_ctx *ctx,
7944 const struct nlattr * const nla[],
7945 struct nft_flowtable_hook *flowtable_hook,
7946 struct nft_flowtable *flowtable,
7947 struct netlink_ext_ack *extack, bool add)
7949 struct nlattr *tb[NFTA_FLOWTABLE_HOOK_MAX + 1];
7950 struct nft_hook *hook;
7951 int hooknum, priority;
7954 INIT_LIST_HEAD(&flowtable_hook->list);
7956 err = nla_parse_nested_deprecated(tb, NFTA_FLOWTABLE_HOOK_MAX,
7957 nla[NFTA_FLOWTABLE_HOOK],
7958 nft_flowtable_hook_policy, NULL);
7963 if (!tb[NFTA_FLOWTABLE_HOOK_NUM] ||
7964 !tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) {
7965 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
7969 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
7970 if (hooknum != NF_NETDEV_INGRESS)
7973 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
7975 flowtable_hook->priority = priority;
7976 flowtable_hook->num = hooknum;
7978 if (tb[NFTA_FLOWTABLE_HOOK_NUM]) {
7979 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
7980 if (hooknum != flowtable->hooknum)
7984 if (tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) {
7985 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
7986 if (priority != flowtable->data.priority)
7990 flowtable_hook->priority = flowtable->data.priority;
7991 flowtable_hook->num = flowtable->hooknum;
7994 if (tb[NFTA_FLOWTABLE_HOOK_DEVS]) {
7995 err = nf_tables_parse_netdev_hooks(ctx->net,
7996 tb[NFTA_FLOWTABLE_HOOK_DEVS],
7997 &flowtable_hook->list,
8003 list_for_each_entry(hook, &flowtable_hook->list, list) {
8004 hook->ops.pf = NFPROTO_NETDEV;
8005 hook->ops.hooknum = flowtable_hook->num;
8006 hook->ops.priority = flowtable_hook->priority;
8007 hook->ops.priv = &flowtable->data;
8008 hook->ops.hook = flowtable->data.type->hook;
8014 static const struct nf_flowtable_type *__nft_flowtable_type_get(u8 family)
8016 const struct nf_flowtable_type *type;
8018 list_for_each_entry(type, &nf_tables_flowtables, list) {
8019 if (family == type->family)
8025 static const struct nf_flowtable_type *
8026 nft_flowtable_type_get(struct net *net, u8 family)
8028 const struct nf_flowtable_type *type;
8030 type = __nft_flowtable_type_get(family);
8031 if (type != NULL && try_module_get(type->owner))
8034 lockdep_nfnl_nft_mutex_not_held();
8035 #ifdef CONFIG_MODULES
8037 if (nft_request_module(net, "nf-flowtable-%u", family) == -EAGAIN)
8038 return ERR_PTR(-EAGAIN);
8041 return ERR_PTR(-ENOENT);
8044 /* Only called from error and netdev event paths. */
8045 static void nft_unregister_flowtable_hook(struct net *net,
8046 struct nft_flowtable *flowtable,
8047 struct nft_hook *hook)
8049 nf_unregister_net_hook(net, &hook->ops);
8050 flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
8054 static void __nft_unregister_flowtable_net_hooks(struct net *net,
8055 struct list_head *hook_list,
8056 bool release_netdev)
8058 struct nft_hook *hook, *next;
8060 list_for_each_entry_safe(hook, next, hook_list, list) {
8061 nf_unregister_net_hook(net, &hook->ops);
8062 if (release_netdev) {
8063 list_del(&hook->list);
8064 kfree_rcu(hook, rcu);
8069 static void nft_unregister_flowtable_net_hooks(struct net *net,
8070 struct list_head *hook_list)
8072 __nft_unregister_flowtable_net_hooks(net, hook_list, false);
8075 static int nft_register_flowtable_net_hooks(struct net *net,
8076 struct nft_table *table,
8077 struct list_head *hook_list,
8078 struct nft_flowtable *flowtable)
8080 struct nft_hook *hook, *hook2, *next;
8081 struct nft_flowtable *ft;
8084 list_for_each_entry(hook, hook_list, list) {
8085 list_for_each_entry(ft, &table->flowtables, list) {
8086 if (!nft_is_active_next(net, ft))
8089 list_for_each_entry(hook2, &ft->hook_list, list) {
8090 if (hook->ops.dev == hook2->ops.dev &&
8091 hook->ops.pf == hook2->ops.pf) {
8093 goto err_unregister_net_hooks;
8098 err = flowtable->data.type->setup(&flowtable->data,
8102 goto err_unregister_net_hooks;
8104 err = nf_register_net_hook(net, &hook->ops);
8106 flowtable->data.type->setup(&flowtable->data,
8109 goto err_unregister_net_hooks;
8117 err_unregister_net_hooks:
8118 list_for_each_entry_safe(hook, next, hook_list, list) {
8122 nft_unregister_flowtable_hook(net, flowtable, hook);
8123 list_del_rcu(&hook->list);
8124 kfree_rcu(hook, rcu);
8130 static void nft_hooks_destroy(struct list_head *hook_list)
8132 struct nft_hook *hook, *next;
8134 list_for_each_entry_safe(hook, next, hook_list, list) {
8135 list_del_rcu(&hook->list);
8136 kfree_rcu(hook, rcu);
8140 static int nft_flowtable_update(struct nft_ctx *ctx, const struct nlmsghdr *nlh,
8141 struct nft_flowtable *flowtable,
8142 struct netlink_ext_ack *extack)
8144 const struct nlattr * const *nla = ctx->nla;
8145 struct nft_flowtable_hook flowtable_hook;
8146 struct nft_hook *hook, *next;
8147 struct nft_trans *trans;
8148 bool unregister = false;
8152 err = nft_flowtable_parse_hook(ctx, nla, &flowtable_hook, flowtable,
8157 list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
8158 if (nft_hook_list_find(&flowtable->hook_list, hook)) {
8159 list_del(&hook->list);
8164 if (nla[NFTA_FLOWTABLE_FLAGS]) {
8165 flags = ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
8166 if (flags & ~NFT_FLOWTABLE_MASK) {
8168 goto err_flowtable_update_hook;
8170 if ((flowtable->data.flags & NFT_FLOWTABLE_HW_OFFLOAD) ^
8171 (flags & NFT_FLOWTABLE_HW_OFFLOAD)) {
8173 goto err_flowtable_update_hook;
8176 flags = flowtable->data.flags;
8179 err = nft_register_flowtable_net_hooks(ctx->net, ctx->table,
8180 &flowtable_hook.list, flowtable);
8182 goto err_flowtable_update_hook;
8184 trans = nft_trans_alloc(ctx, NFT_MSG_NEWFLOWTABLE,
8185 sizeof(struct nft_trans_flowtable));
8189 goto err_flowtable_update_hook;
8192 nft_trans_flowtable_flags(trans) = flags;
8193 nft_trans_flowtable(trans) = flowtable;
8194 nft_trans_flowtable_update(trans) = true;
8195 INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
8196 list_splice(&flowtable_hook.list, &nft_trans_flowtable_hooks(trans));
8198 nft_trans_commit_list_add_tail(ctx->net, trans);
8202 err_flowtable_update_hook:
8203 list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
8205 nft_unregister_flowtable_hook(ctx->net, flowtable, hook);
8206 list_del_rcu(&hook->list);
8207 kfree_rcu(hook, rcu);
8214 static int nf_tables_newflowtable(struct sk_buff *skb,
8215 const struct nfnl_info *info,
8216 const struct nlattr * const nla[])
8218 struct netlink_ext_ack *extack = info->extack;
8219 struct nft_flowtable_hook flowtable_hook;
8220 u8 genmask = nft_genmask_next(info->net);
8221 u8 family = info->nfmsg->nfgen_family;
8222 const struct nf_flowtable_type *type;
8223 struct nft_flowtable *flowtable;
8224 struct nft_hook *hook, *next;
8225 struct net *net = info->net;
8226 struct nft_table *table;
8230 if (!nla[NFTA_FLOWTABLE_TABLE] ||
8231 !nla[NFTA_FLOWTABLE_NAME] ||
8232 !nla[NFTA_FLOWTABLE_HOOK])
8235 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
8236 genmask, NETLINK_CB(skb).portid);
8237 if (IS_ERR(table)) {
8238 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
8239 return PTR_ERR(table);
8242 flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
8244 if (IS_ERR(flowtable)) {
8245 err = PTR_ERR(flowtable);
8246 if (err != -ENOENT) {
8247 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
8251 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
8252 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
8256 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
8258 return nft_flowtable_update(&ctx, info->nlh, flowtable, extack);
8261 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
8263 flowtable = kzalloc(sizeof(*flowtable), GFP_KERNEL_ACCOUNT);
8267 flowtable->table = table;
8268 flowtable->handle = nf_tables_alloc_handle(table);
8269 INIT_LIST_HEAD(&flowtable->hook_list);
8271 flowtable->name = nla_strdup(nla[NFTA_FLOWTABLE_NAME], GFP_KERNEL_ACCOUNT);
8272 if (!flowtable->name) {
8277 type = nft_flowtable_type_get(net, family);
8279 err = PTR_ERR(type);
8283 if (nla[NFTA_FLOWTABLE_FLAGS]) {
8284 flowtable->data.flags =
8285 ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
8286 if (flowtable->data.flags & ~NFT_FLOWTABLE_MASK) {
8292 write_pnet(&flowtable->data.net, net);
8293 flowtable->data.type = type;
8294 err = type->init(&flowtable->data);
8298 err = nft_flowtable_parse_hook(&ctx, nla, &flowtable_hook, flowtable,
8303 list_splice(&flowtable_hook.list, &flowtable->hook_list);
8304 flowtable->data.priority = flowtable_hook.priority;
8305 flowtable->hooknum = flowtable_hook.num;
8307 err = nft_register_flowtable_net_hooks(ctx.net, table,
8308 &flowtable->hook_list,
8311 nft_hooks_destroy(&flowtable->hook_list);
8315 err = nft_trans_flowtable_add(&ctx, NFT_MSG_NEWFLOWTABLE, flowtable);
8319 list_add_tail_rcu(&flowtable->list, &table->flowtables);
8324 list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
8325 nft_unregister_flowtable_hook(net, flowtable, hook);
8326 list_del_rcu(&hook->list);
8327 kfree_rcu(hook, rcu);
8330 flowtable->data.type->free(&flowtable->data);
8332 module_put(type->owner);
8334 kfree(flowtable->name);
8340 static void nft_flowtable_hook_release(struct nft_flowtable_hook *flowtable_hook)
8342 struct nft_hook *this, *next;
8344 list_for_each_entry_safe(this, next, &flowtable_hook->list, list) {
8345 list_del(&this->list);
8350 static int nft_delflowtable_hook(struct nft_ctx *ctx,
8351 struct nft_flowtable *flowtable,
8352 struct netlink_ext_ack *extack)
8354 const struct nlattr * const *nla = ctx->nla;
8355 struct nft_flowtable_hook flowtable_hook;
8356 LIST_HEAD(flowtable_del_list);
8357 struct nft_hook *this, *hook;
8358 struct nft_trans *trans;
8361 err = nft_flowtable_parse_hook(ctx, nla, &flowtable_hook, flowtable,
8366 list_for_each_entry(this, &flowtable_hook.list, list) {
8367 hook = nft_hook_list_find(&flowtable->hook_list, this);
8370 goto err_flowtable_del_hook;
8372 list_move(&hook->list, &flowtable_del_list);
8375 trans = nft_trans_alloc(ctx, NFT_MSG_DELFLOWTABLE,
8376 sizeof(struct nft_trans_flowtable));
8379 goto err_flowtable_del_hook;
8382 nft_trans_flowtable(trans) = flowtable;
8383 nft_trans_flowtable_update(trans) = true;
8384 INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
8385 list_splice(&flowtable_del_list, &nft_trans_flowtable_hooks(trans));
8386 nft_flowtable_hook_release(&flowtable_hook);
8388 nft_trans_commit_list_add_tail(ctx->net, trans);
8392 err_flowtable_del_hook:
8393 list_splice(&flowtable_del_list, &flowtable->hook_list);
8394 nft_flowtable_hook_release(&flowtable_hook);
8399 static int nf_tables_delflowtable(struct sk_buff *skb,
8400 const struct nfnl_info *info,
8401 const struct nlattr * const nla[])
8403 struct netlink_ext_ack *extack = info->extack;
8404 u8 genmask = nft_genmask_next(info->net);
8405 u8 family = info->nfmsg->nfgen_family;
8406 struct nft_flowtable *flowtable;
8407 struct net *net = info->net;
8408 const struct nlattr *attr;
8409 struct nft_table *table;
8412 if (!nla[NFTA_FLOWTABLE_TABLE] ||
8413 (!nla[NFTA_FLOWTABLE_NAME] &&
8414 !nla[NFTA_FLOWTABLE_HANDLE]))
8417 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
8418 genmask, NETLINK_CB(skb).portid);
8419 if (IS_ERR(table)) {
8420 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
8421 return PTR_ERR(table);
8424 if (nla[NFTA_FLOWTABLE_HANDLE]) {
8425 attr = nla[NFTA_FLOWTABLE_HANDLE];
8426 flowtable = nft_flowtable_lookup_byhandle(table, attr, genmask);
8428 attr = nla[NFTA_FLOWTABLE_NAME];
8429 flowtable = nft_flowtable_lookup(table, attr, genmask);
8432 if (IS_ERR(flowtable)) {
8433 if (PTR_ERR(flowtable) == -ENOENT &&
8434 NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYFLOWTABLE)
8437 NL_SET_BAD_ATTR(extack, attr);
8438 return PTR_ERR(flowtable);
8441 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
8443 if (nla[NFTA_FLOWTABLE_HOOK])
8444 return nft_delflowtable_hook(&ctx, flowtable, extack);
8446 if (flowtable->use > 0) {
8447 NL_SET_BAD_ATTR(extack, attr);
8451 return nft_delflowtable(&ctx, flowtable);
8454 static int nf_tables_fill_flowtable_info(struct sk_buff *skb, struct net *net,
8455 u32 portid, u32 seq, int event,
8456 u32 flags, int family,
8457 struct nft_flowtable *flowtable,
8458 struct list_head *hook_list)
8460 struct nlattr *nest, *nest_devs;
8461 struct nft_hook *hook;
8462 struct nlmsghdr *nlh;
8464 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
8465 nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
8466 NFNETLINK_V0, nft_base_seq(net));
8468 goto nla_put_failure;
8470 if (nla_put_string(skb, NFTA_FLOWTABLE_TABLE, flowtable->table->name) ||
8471 nla_put_string(skb, NFTA_FLOWTABLE_NAME, flowtable->name) ||
8472 nla_put_be64(skb, NFTA_FLOWTABLE_HANDLE, cpu_to_be64(flowtable->handle),
8473 NFTA_FLOWTABLE_PAD))
8474 goto nla_put_failure;
8476 if (event == NFT_MSG_DELFLOWTABLE && !hook_list) {
8477 nlmsg_end(skb, nlh);
8481 if (nla_put_be32(skb, NFTA_FLOWTABLE_USE, htonl(flowtable->use)) ||
8482 nla_put_be32(skb, NFTA_FLOWTABLE_FLAGS, htonl(flowtable->data.flags)))
8483 goto nla_put_failure;
8485 nest = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK);
8487 goto nla_put_failure;
8488 if (nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_NUM, htonl(flowtable->hooknum)) ||
8489 nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_PRIORITY, htonl(flowtable->data.priority)))
8490 goto nla_put_failure;
8492 nest_devs = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK_DEVS);
8494 goto nla_put_failure;
8497 hook_list = &flowtable->hook_list;
8499 list_for_each_entry_rcu(hook, hook_list, list) {
8500 if (nla_put_string(skb, NFTA_DEVICE_NAME, hook->ops.dev->name))
8501 goto nla_put_failure;
8503 nla_nest_end(skb, nest_devs);
8504 nla_nest_end(skb, nest);
8506 nlmsg_end(skb, nlh);
8510 nlmsg_trim(skb, nlh);
8514 struct nft_flowtable_filter {
8518 static int nf_tables_dump_flowtable(struct sk_buff *skb,
8519 struct netlink_callback *cb)
8521 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
8522 struct nft_flowtable_filter *filter = cb->data;
8523 unsigned int idx = 0, s_idx = cb->args[0];
8524 struct net *net = sock_net(skb->sk);
8525 int family = nfmsg->nfgen_family;
8526 struct nft_flowtable *flowtable;
8527 struct nftables_pernet *nft_net;
8528 const struct nft_table *table;
8531 nft_net = nft_pernet(net);
8532 cb->seq = READ_ONCE(nft_net->base_seq);
8534 list_for_each_entry_rcu(table, &nft_net->tables, list) {
8535 if (family != NFPROTO_UNSPEC && family != table->family)
8538 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
8539 if (!nft_is_active(net, flowtable))
8544 memset(&cb->args[1], 0,
8545 sizeof(cb->args) - sizeof(cb->args[0]));
8546 if (filter && filter->table &&
8547 strcmp(filter->table, table->name))
8550 if (nf_tables_fill_flowtable_info(skb, net, NETLINK_CB(cb->skb).portid,
8552 NFT_MSG_NEWFLOWTABLE,
8553 NLM_F_MULTI | NLM_F_APPEND,
8555 flowtable, NULL) < 0)
8558 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
8570 static int nf_tables_dump_flowtable_start(struct netlink_callback *cb)
8572 const struct nlattr * const *nla = cb->data;
8573 struct nft_flowtable_filter *filter = NULL;
8575 if (nla[NFTA_FLOWTABLE_TABLE]) {
8576 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
8580 filter->table = nla_strdup(nla[NFTA_FLOWTABLE_TABLE],
8582 if (!filter->table) {
8592 static int nf_tables_dump_flowtable_done(struct netlink_callback *cb)
8594 struct nft_flowtable_filter *filter = cb->data;
8599 kfree(filter->table);
8605 /* called with rcu_read_lock held */
8606 static int nf_tables_getflowtable(struct sk_buff *skb,
8607 const struct nfnl_info *info,
8608 const struct nlattr * const nla[])
8610 u8 genmask = nft_genmask_cur(info->net);
8611 u8 family = info->nfmsg->nfgen_family;
8612 struct nft_flowtable *flowtable;
8613 const struct nft_table *table;
8614 struct net *net = info->net;
8615 struct sk_buff *skb2;
8618 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
8619 struct netlink_dump_control c = {
8620 .start = nf_tables_dump_flowtable_start,
8621 .dump = nf_tables_dump_flowtable,
8622 .done = nf_tables_dump_flowtable_done,
8623 .module = THIS_MODULE,
8624 .data = (void *)nla,
8627 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
8630 if (!nla[NFTA_FLOWTABLE_NAME])
8633 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
8636 return PTR_ERR(table);
8638 flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
8640 if (IS_ERR(flowtable))
8641 return PTR_ERR(flowtable);
8643 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
8647 err = nf_tables_fill_flowtable_info(skb2, net, NETLINK_CB(skb).portid,
8648 info->nlh->nlmsg_seq,
8649 NFT_MSG_NEWFLOWTABLE, 0, family,
8652 goto err_fill_flowtable_info;
8654 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
8656 err_fill_flowtable_info:
8661 static void nf_tables_flowtable_notify(struct nft_ctx *ctx,
8662 struct nft_flowtable *flowtable,
8663 struct list_head *hook_list, int event)
8665 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
8666 struct sk_buff *skb;
8671 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
8674 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
8678 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
8679 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
8681 err = nf_tables_fill_flowtable_info(skb, ctx->net, ctx->portid,
8682 ctx->seq, event, flags,
8683 ctx->family, flowtable, hook_list);
8689 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
8692 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
8695 static void nf_tables_flowtable_destroy(struct nft_flowtable *flowtable)
8697 struct nft_hook *hook, *next;
8699 flowtable->data.type->free(&flowtable->data);
8700 list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
8701 flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
8703 list_del_rcu(&hook->list);
8706 kfree(flowtable->name);
8707 module_put(flowtable->data.type->owner);
8711 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
8712 u32 portid, u32 seq)
8714 struct nftables_pernet *nft_net = nft_pernet(net);
8715 struct nlmsghdr *nlh;
8716 char buf[TASK_COMM_LEN];
8717 int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN);
8719 nlh = nfnl_msg_put(skb, portid, seq, event, 0, AF_UNSPEC,
8720 NFNETLINK_V0, nft_base_seq(net));
8722 goto nla_put_failure;
8724 if (nla_put_be32(skb, NFTA_GEN_ID, htonl(nft_net->base_seq)) ||
8725 nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) ||
8726 nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current)))
8727 goto nla_put_failure;
8729 nlmsg_end(skb, nlh);
8733 nlmsg_trim(skb, nlh);
8737 static void nft_flowtable_event(unsigned long event, struct net_device *dev,
8738 struct nft_flowtable *flowtable)
8740 struct nft_hook *hook;
8742 list_for_each_entry(hook, &flowtable->hook_list, list) {
8743 if (hook->ops.dev != dev)
8746 /* flow_offload_netdev_event() cleans up entries for us. */
8747 nft_unregister_flowtable_hook(dev_net(dev), flowtable, hook);
8748 list_del_rcu(&hook->list);
8749 kfree_rcu(hook, rcu);
8754 static int nf_tables_flowtable_event(struct notifier_block *this,
8755 unsigned long event, void *ptr)
8757 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
8758 struct nft_flowtable *flowtable;
8759 struct nftables_pernet *nft_net;
8760 struct nft_table *table;
8763 if (event != NETDEV_UNREGISTER)
8767 nft_net = nft_pernet(net);
8768 mutex_lock(&nft_net->commit_mutex);
8769 list_for_each_entry(table, &nft_net->tables, list) {
8770 list_for_each_entry(flowtable, &table->flowtables, list) {
8771 nft_flowtable_event(event, dev, flowtable);
8774 mutex_unlock(&nft_net->commit_mutex);
8779 static struct notifier_block nf_tables_flowtable_notifier = {
8780 .notifier_call = nf_tables_flowtable_event,
8783 static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
8786 struct nlmsghdr *nlh = nlmsg_hdr(skb);
8787 struct sk_buff *skb2;
8790 if (!nlmsg_report(nlh) &&
8791 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
8794 skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
8798 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
8805 nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
8806 nlmsg_report(nlh), GFP_KERNEL);
8809 nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
8813 static int nf_tables_getgen(struct sk_buff *skb, const struct nfnl_info *info,
8814 const struct nlattr * const nla[])
8816 struct sk_buff *skb2;
8819 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
8823 err = nf_tables_fill_gen_info(skb2, info->net, NETLINK_CB(skb).portid,
8824 info->nlh->nlmsg_seq);
8826 goto err_fill_gen_info;
8828 return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid);
8835 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
8836 [NFT_MSG_NEWTABLE] = {
8837 .call = nf_tables_newtable,
8838 .type = NFNL_CB_BATCH,
8839 .attr_count = NFTA_TABLE_MAX,
8840 .policy = nft_table_policy,
8842 [NFT_MSG_GETTABLE] = {
8843 .call = nf_tables_gettable,
8844 .type = NFNL_CB_RCU,
8845 .attr_count = NFTA_TABLE_MAX,
8846 .policy = nft_table_policy,
8848 [NFT_MSG_DELTABLE] = {
8849 .call = nf_tables_deltable,
8850 .type = NFNL_CB_BATCH,
8851 .attr_count = NFTA_TABLE_MAX,
8852 .policy = nft_table_policy,
8854 [NFT_MSG_DESTROYTABLE] = {
8855 .call = nf_tables_deltable,
8856 .type = NFNL_CB_BATCH,
8857 .attr_count = NFTA_TABLE_MAX,
8858 .policy = nft_table_policy,
8860 [NFT_MSG_NEWCHAIN] = {
8861 .call = nf_tables_newchain,
8862 .type = NFNL_CB_BATCH,
8863 .attr_count = NFTA_CHAIN_MAX,
8864 .policy = nft_chain_policy,
8866 [NFT_MSG_GETCHAIN] = {
8867 .call = nf_tables_getchain,
8868 .type = NFNL_CB_RCU,
8869 .attr_count = NFTA_CHAIN_MAX,
8870 .policy = nft_chain_policy,
8872 [NFT_MSG_DELCHAIN] = {
8873 .call = nf_tables_delchain,
8874 .type = NFNL_CB_BATCH,
8875 .attr_count = NFTA_CHAIN_MAX,
8876 .policy = nft_chain_policy,
8878 [NFT_MSG_DESTROYCHAIN] = {
8879 .call = nf_tables_delchain,
8880 .type = NFNL_CB_BATCH,
8881 .attr_count = NFTA_CHAIN_MAX,
8882 .policy = nft_chain_policy,
8884 [NFT_MSG_NEWRULE] = {
8885 .call = nf_tables_newrule,
8886 .type = NFNL_CB_BATCH,
8887 .attr_count = NFTA_RULE_MAX,
8888 .policy = nft_rule_policy,
8890 [NFT_MSG_GETRULE] = {
8891 .call = nf_tables_getrule,
8892 .type = NFNL_CB_RCU,
8893 .attr_count = NFTA_RULE_MAX,
8894 .policy = nft_rule_policy,
8896 [NFT_MSG_GETRULE_RESET] = {
8897 .call = nf_tables_getrule,
8898 .type = NFNL_CB_RCU,
8899 .attr_count = NFTA_RULE_MAX,
8900 .policy = nft_rule_policy,
8902 [NFT_MSG_DELRULE] = {
8903 .call = nf_tables_delrule,
8904 .type = NFNL_CB_BATCH,
8905 .attr_count = NFTA_RULE_MAX,
8906 .policy = nft_rule_policy,
8908 [NFT_MSG_DESTROYRULE] = {
8909 .call = nf_tables_delrule,
8910 .type = NFNL_CB_BATCH,
8911 .attr_count = NFTA_RULE_MAX,
8912 .policy = nft_rule_policy,
8914 [NFT_MSG_NEWSET] = {
8915 .call = nf_tables_newset,
8916 .type = NFNL_CB_BATCH,
8917 .attr_count = NFTA_SET_MAX,
8918 .policy = nft_set_policy,
8920 [NFT_MSG_GETSET] = {
8921 .call = nf_tables_getset,
8922 .type = NFNL_CB_RCU,
8923 .attr_count = NFTA_SET_MAX,
8924 .policy = nft_set_policy,
8926 [NFT_MSG_DELSET] = {
8927 .call = nf_tables_delset,
8928 .type = NFNL_CB_BATCH,
8929 .attr_count = NFTA_SET_MAX,
8930 .policy = nft_set_policy,
8932 [NFT_MSG_DESTROYSET] = {
8933 .call = nf_tables_delset,
8934 .type = NFNL_CB_BATCH,
8935 .attr_count = NFTA_SET_MAX,
8936 .policy = nft_set_policy,
8938 [NFT_MSG_NEWSETELEM] = {
8939 .call = nf_tables_newsetelem,
8940 .type = NFNL_CB_BATCH,
8941 .attr_count = NFTA_SET_ELEM_LIST_MAX,
8942 .policy = nft_set_elem_list_policy,
8944 [NFT_MSG_GETSETELEM] = {
8945 .call = nf_tables_getsetelem,
8946 .type = NFNL_CB_RCU,
8947 .attr_count = NFTA_SET_ELEM_LIST_MAX,
8948 .policy = nft_set_elem_list_policy,
8950 [NFT_MSG_GETSETELEM_RESET] = {
8951 .call = nf_tables_getsetelem,
8952 .type = NFNL_CB_RCU,
8953 .attr_count = NFTA_SET_ELEM_LIST_MAX,
8954 .policy = nft_set_elem_list_policy,
8956 [NFT_MSG_DELSETELEM] = {
8957 .call = nf_tables_delsetelem,
8958 .type = NFNL_CB_BATCH,
8959 .attr_count = NFTA_SET_ELEM_LIST_MAX,
8960 .policy = nft_set_elem_list_policy,
8962 [NFT_MSG_DESTROYSETELEM] = {
8963 .call = nf_tables_delsetelem,
8964 .type = NFNL_CB_BATCH,
8965 .attr_count = NFTA_SET_ELEM_LIST_MAX,
8966 .policy = nft_set_elem_list_policy,
8968 [NFT_MSG_GETGEN] = {
8969 .call = nf_tables_getgen,
8970 .type = NFNL_CB_RCU,
8972 [NFT_MSG_NEWOBJ] = {
8973 .call = nf_tables_newobj,
8974 .type = NFNL_CB_BATCH,
8975 .attr_count = NFTA_OBJ_MAX,
8976 .policy = nft_obj_policy,
8978 [NFT_MSG_GETOBJ] = {
8979 .call = nf_tables_getobj,
8980 .type = NFNL_CB_RCU,
8981 .attr_count = NFTA_OBJ_MAX,
8982 .policy = nft_obj_policy,
8984 [NFT_MSG_DELOBJ] = {
8985 .call = nf_tables_delobj,
8986 .type = NFNL_CB_BATCH,
8987 .attr_count = NFTA_OBJ_MAX,
8988 .policy = nft_obj_policy,
8990 [NFT_MSG_DESTROYOBJ] = {
8991 .call = nf_tables_delobj,
8992 .type = NFNL_CB_BATCH,
8993 .attr_count = NFTA_OBJ_MAX,
8994 .policy = nft_obj_policy,
8996 [NFT_MSG_GETOBJ_RESET] = {
8997 .call = nf_tables_getobj,
8998 .type = NFNL_CB_RCU,
8999 .attr_count = NFTA_OBJ_MAX,
9000 .policy = nft_obj_policy,
9002 [NFT_MSG_NEWFLOWTABLE] = {
9003 .call = nf_tables_newflowtable,
9004 .type = NFNL_CB_BATCH,
9005 .attr_count = NFTA_FLOWTABLE_MAX,
9006 .policy = nft_flowtable_policy,
9008 [NFT_MSG_GETFLOWTABLE] = {
9009 .call = nf_tables_getflowtable,
9010 .type = NFNL_CB_RCU,
9011 .attr_count = NFTA_FLOWTABLE_MAX,
9012 .policy = nft_flowtable_policy,
9014 [NFT_MSG_DELFLOWTABLE] = {
9015 .call = nf_tables_delflowtable,
9016 .type = NFNL_CB_BATCH,
9017 .attr_count = NFTA_FLOWTABLE_MAX,
9018 .policy = nft_flowtable_policy,
9020 [NFT_MSG_DESTROYFLOWTABLE] = {
9021 .call = nf_tables_delflowtable,
9022 .type = NFNL_CB_BATCH,
9023 .attr_count = NFTA_FLOWTABLE_MAX,
9024 .policy = nft_flowtable_policy,
9028 static int nf_tables_validate(struct net *net)
9030 struct nftables_pernet *nft_net = nft_pernet(net);
9031 struct nft_table *table;
9033 list_for_each_entry(table, &nft_net->tables, list) {
9034 switch (table->validate_state) {
9035 case NFT_VALIDATE_SKIP:
9037 case NFT_VALIDATE_NEED:
9038 nft_validate_state_update(table, NFT_VALIDATE_DO);
9040 case NFT_VALIDATE_DO:
9041 if (nft_table_validate(net, table) < 0)
9044 nft_validate_state_update(table, NFT_VALIDATE_SKIP);
9053 /* a drop policy has to be deferred until all rules have been activated,
9054 * otherwise a large ruleset that contains a drop-policy base chain will
9055 * cause all packets to get dropped until the full transaction has been
9058 * We defer the drop policy until the transaction has been finalized.
9060 static void nft_chain_commit_drop_policy(struct nft_trans *trans)
9062 struct nft_base_chain *basechain;
9064 if (nft_trans_chain_policy(trans) != NF_DROP)
9067 if (!nft_is_base_chain(trans->ctx.chain))
9070 basechain = nft_base_chain(trans->ctx.chain);
9071 basechain->policy = NF_DROP;
9074 static void nft_chain_commit_update(struct nft_trans *trans)
9076 struct nft_base_chain *basechain;
9078 if (nft_trans_chain_name(trans)) {
9079 rhltable_remove(&trans->ctx.table->chains_ht,
9080 &trans->ctx.chain->rhlhead,
9081 nft_chain_ht_params);
9082 swap(trans->ctx.chain->name, nft_trans_chain_name(trans));
9083 rhltable_insert_key(&trans->ctx.table->chains_ht,
9084 trans->ctx.chain->name,
9085 &trans->ctx.chain->rhlhead,
9086 nft_chain_ht_params);
9089 if (!nft_is_base_chain(trans->ctx.chain))
9092 nft_chain_stats_replace(trans);
9094 basechain = nft_base_chain(trans->ctx.chain);
9096 switch (nft_trans_chain_policy(trans)) {
9099 basechain->policy = nft_trans_chain_policy(trans);
9104 static void nft_obj_commit_update(struct nft_trans *trans)
9106 struct nft_object *newobj;
9107 struct nft_object *obj;
9109 obj = nft_trans_obj(trans);
9110 newobj = nft_trans_obj_newobj(trans);
9112 if (obj->ops->update)
9113 obj->ops->update(obj, newobj);
9115 nft_obj_destroy(&trans->ctx, newobj);
9118 static void nft_commit_release(struct nft_trans *trans)
9120 switch (trans->msg_type) {
9121 case NFT_MSG_DELTABLE:
9122 case NFT_MSG_DESTROYTABLE:
9123 nf_tables_table_destroy(&trans->ctx);
9125 case NFT_MSG_NEWCHAIN:
9126 free_percpu(nft_trans_chain_stats(trans));
9127 kfree(nft_trans_chain_name(trans));
9129 case NFT_MSG_DELCHAIN:
9130 case NFT_MSG_DESTROYCHAIN:
9131 if (nft_trans_chain_update(trans))
9132 nft_hooks_destroy(&nft_trans_chain_hooks(trans));
9134 nf_tables_chain_destroy(&trans->ctx);
9136 case NFT_MSG_DELRULE:
9137 case NFT_MSG_DESTROYRULE:
9138 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
9140 case NFT_MSG_DELSET:
9141 case NFT_MSG_DESTROYSET:
9142 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
9144 case NFT_MSG_DELSETELEM:
9145 case NFT_MSG_DESTROYSETELEM:
9146 nf_tables_set_elem_destroy(&trans->ctx,
9147 nft_trans_elem_set(trans),
9148 nft_trans_elem(trans).priv);
9150 case NFT_MSG_DELOBJ:
9151 case NFT_MSG_DESTROYOBJ:
9152 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
9154 case NFT_MSG_DELFLOWTABLE:
9155 case NFT_MSG_DESTROYFLOWTABLE:
9156 if (nft_trans_flowtable_update(trans))
9157 nft_hooks_destroy(&nft_trans_flowtable_hooks(trans));
9159 nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
9164 put_net(trans->ctx.net);
9169 static void nf_tables_trans_destroy_work(struct work_struct *w)
9171 struct nft_trans *trans, *next;
9174 spin_lock(&nf_tables_destroy_list_lock);
9175 list_splice_init(&nf_tables_destroy_list, &head);
9176 spin_unlock(&nf_tables_destroy_list_lock);
9178 if (list_empty(&head))
9183 list_for_each_entry_safe(trans, next, &head, list) {
9184 nft_trans_list_del(trans);
9185 nft_commit_release(trans);
9189 void nf_tables_trans_destroy_flush_work(void)
9191 flush_work(&trans_destroy_work);
9193 EXPORT_SYMBOL_GPL(nf_tables_trans_destroy_flush_work);
9195 static bool nft_expr_reduce(struct nft_regs_track *track,
9196 const struct nft_expr *expr)
9201 static int nf_tables_commit_chain_prepare(struct net *net, struct nft_chain *chain)
9203 const struct nft_expr *expr, *last;
9204 struct nft_regs_track track = {};
9205 unsigned int size, data_size;
9206 void *data, *data_boundary;
9207 struct nft_rule_dp *prule;
9208 struct nft_rule *rule;
9210 /* already handled or inactive chain? */
9211 if (chain->blob_next || !nft_is_active_next(net, chain))
9215 list_for_each_entry(rule, &chain->rules, list) {
9216 if (nft_is_active_next(net, rule)) {
9217 data_size += sizeof(*prule) + rule->dlen;
9218 if (data_size > INT_MAX)
9223 chain->blob_next = nf_tables_chain_alloc_rules(chain, data_size);
9224 if (!chain->blob_next)
9227 data = (void *)chain->blob_next->data;
9228 data_boundary = data + data_size;
9231 list_for_each_entry(rule, &chain->rules, list) {
9232 if (!nft_is_active_next(net, rule))
9235 prule = (struct nft_rule_dp *)data;
9236 data += offsetof(struct nft_rule_dp, data);
9237 if (WARN_ON_ONCE(data > data_boundary))
9241 track.last = nft_expr_last(rule);
9242 nft_rule_for_each_expr(expr, last, rule) {
9245 if (nft_expr_reduce(&track, expr)) {
9250 if (WARN_ON_ONCE(data + size + expr->ops->size > data_boundary))
9253 memcpy(data + size, expr, expr->ops->size);
9254 size += expr->ops->size;
9256 if (WARN_ON_ONCE(size >= 1 << 12))
9259 prule->handle = rule->handle;
9265 chain->blob_next->size += (unsigned long)(data - (void *)prule);
9268 if (WARN_ON_ONCE(data > data_boundary))
9271 prule = (struct nft_rule_dp *)data;
9272 nft_last_rule(chain, prule);
9277 static void nf_tables_commit_chain_prepare_cancel(struct net *net)
9279 struct nftables_pernet *nft_net = nft_pernet(net);
9280 struct nft_trans *trans, *next;
9282 list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
9283 struct nft_chain *chain = trans->ctx.chain;
9285 if (trans->msg_type == NFT_MSG_NEWRULE ||
9286 trans->msg_type == NFT_MSG_DELRULE) {
9287 kvfree(chain->blob_next);
9288 chain->blob_next = NULL;
9293 static void __nf_tables_commit_chain_free_rules(struct rcu_head *h)
9295 struct nft_rule_dp_last *l = container_of(h, struct nft_rule_dp_last, h);
9300 static void nf_tables_commit_chain_free_rules_old(struct nft_rule_blob *blob)
9302 struct nft_rule_dp_last *last;
9304 /* last rule trailer is after end marker */
9305 last = (void *)blob + sizeof(*blob) + blob->size;
9308 call_rcu(&last->h, __nf_tables_commit_chain_free_rules);
9311 static void nf_tables_commit_chain(struct net *net, struct nft_chain *chain)
9313 struct nft_rule_blob *g0, *g1;
9316 next_genbit = nft_gencursor_next(net);
9318 g0 = rcu_dereference_protected(chain->blob_gen_0,
9319 lockdep_commit_lock_is_held(net));
9320 g1 = rcu_dereference_protected(chain->blob_gen_1,
9321 lockdep_commit_lock_is_held(net));
9323 /* No changes to this chain? */
9324 if (chain->blob_next == NULL) {
9325 /* chain had no change in last or next generation */
9329 * chain had no change in this generation; make sure next
9330 * one uses same rules as current generation.
9333 rcu_assign_pointer(chain->blob_gen_1, g0);
9334 nf_tables_commit_chain_free_rules_old(g1);
9336 rcu_assign_pointer(chain->blob_gen_0, g1);
9337 nf_tables_commit_chain_free_rules_old(g0);
9344 rcu_assign_pointer(chain->blob_gen_1, chain->blob_next);
9346 rcu_assign_pointer(chain->blob_gen_0, chain->blob_next);
9348 chain->blob_next = NULL;
9354 nf_tables_commit_chain_free_rules_old(g1);
9356 nf_tables_commit_chain_free_rules_old(g0);
9359 static void nft_obj_del(struct nft_object *obj)
9361 rhltable_remove(&nft_objname_ht, &obj->rhlhead, nft_objname_ht_params);
9362 list_del_rcu(&obj->list);
9365 void nft_chain_del(struct nft_chain *chain)
9367 struct nft_table *table = chain->table;
9369 WARN_ON_ONCE(rhltable_remove(&table->chains_ht, &chain->rhlhead,
9370 nft_chain_ht_params));
9371 list_del_rcu(&chain->list);
9374 static void nf_tables_module_autoload_cleanup(struct net *net)
9376 struct nftables_pernet *nft_net = nft_pernet(net);
9377 struct nft_module_request *req, *next;
9379 WARN_ON_ONCE(!list_empty(&nft_net->commit_list));
9380 list_for_each_entry_safe(req, next, &nft_net->module_list, list) {
9381 WARN_ON_ONCE(!req->done);
9382 list_del(&req->list);
9387 static void nf_tables_commit_release(struct net *net)
9389 struct nftables_pernet *nft_net = nft_pernet(net);
9390 struct nft_trans *trans;
9392 /* all side effects have to be made visible.
9393 * For example, if a chain named 'foo' has been deleted, a
9394 * new transaction must not find it anymore.
9396 * Memory reclaim happens asynchronously from work queue
9397 * to prevent expensive synchronize_rcu() in commit phase.
9399 if (list_empty(&nft_net->commit_list)) {
9400 nf_tables_module_autoload_cleanup(net);
9401 mutex_unlock(&nft_net->commit_mutex);
9405 trans = list_last_entry(&nft_net->commit_list,
9406 struct nft_trans, list);
9407 get_net(trans->ctx.net);
9408 WARN_ON_ONCE(trans->put_net);
9410 trans->put_net = true;
9411 spin_lock(&nf_tables_destroy_list_lock);
9412 list_splice_tail_init(&nft_net->commit_list, &nf_tables_destroy_list);
9413 spin_unlock(&nf_tables_destroy_list_lock);
9415 nf_tables_module_autoload_cleanup(net);
9416 schedule_work(&trans_destroy_work);
9418 mutex_unlock(&nft_net->commit_mutex);
9421 static void nft_commit_notify(struct net *net, u32 portid)
9423 struct nftables_pernet *nft_net = nft_pernet(net);
9424 struct sk_buff *batch_skb = NULL, *nskb, *skb;
9425 unsigned char *data;
9428 list_for_each_entry_safe(skb, nskb, &nft_net->notify_list, list) {
9432 len = NLMSG_GOODSIZE - skb->len;
9433 list_del(&skb->list);
9437 if (len > 0 && NFT_CB(skb).report == NFT_CB(batch_skb).report) {
9438 data = skb_put(batch_skb, skb->len);
9439 memcpy(data, skb->data, skb->len);
9440 list_del(&skb->list);
9444 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
9445 NFT_CB(batch_skb).report, GFP_KERNEL);
9450 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
9451 NFT_CB(batch_skb).report, GFP_KERNEL);
9454 WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
9457 static int nf_tables_commit_audit_alloc(struct list_head *adl,
9458 struct nft_table *table)
9460 struct nft_audit_data *adp;
9462 list_for_each_entry(adp, adl, list) {
9463 if (adp->table == table)
9466 adp = kzalloc(sizeof(*adp), GFP_KERNEL);
9470 list_add(&adp->list, adl);
9474 static void nf_tables_commit_audit_free(struct list_head *adl)
9476 struct nft_audit_data *adp, *adn;
9478 list_for_each_entry_safe(adp, adn, adl, list) {
9479 list_del(&adp->list);
9484 static void nf_tables_commit_audit_collect(struct list_head *adl,
9485 struct nft_table *table, u32 op)
9487 struct nft_audit_data *adp;
9489 list_for_each_entry(adp, adl, list) {
9490 if (adp->table == table)
9493 WARN_ONCE(1, "table=%s not expected in commit list", table->name);
9497 if (!adp->op || adp->op > op)
9501 #define AUNFTABLENAMELEN (NFT_TABLE_MAXNAMELEN + 22)
9503 static void nf_tables_commit_audit_log(struct list_head *adl, u32 generation)
9505 struct nft_audit_data *adp, *adn;
9506 char aubuf[AUNFTABLENAMELEN];
9508 list_for_each_entry_safe(adp, adn, adl, list) {
9509 snprintf(aubuf, AUNFTABLENAMELEN, "%s:%u", adp->table->name,
9511 audit_log_nfcfg(aubuf, adp->table->family, adp->entries,
9512 nft2audit_op[adp->op], GFP_KERNEL);
9513 list_del(&adp->list);
9518 static void nft_set_commit_update(struct list_head *set_update_list)
9520 struct nft_set *set, *next;
9522 list_for_each_entry_safe(set, next, set_update_list, pending_update) {
9523 list_del_init(&set->pending_update);
9525 if (!set->ops->commit)
9528 set->ops->commit(set);
9532 static int nf_tables_commit(struct net *net, struct sk_buff *skb)
9534 struct nftables_pernet *nft_net = nft_pernet(net);
9535 struct nft_trans *trans, *next;
9536 LIST_HEAD(set_update_list);
9537 struct nft_trans_elem *te;
9538 struct nft_chain *chain;
9539 struct nft_table *table;
9540 unsigned int base_seq;
9544 if (list_empty(&nft_net->commit_list)) {
9545 mutex_unlock(&nft_net->commit_mutex);
9549 list_for_each_entry(trans, &nft_net->binding_list, binding_list) {
9550 switch (trans->msg_type) {
9551 case NFT_MSG_NEWSET:
9552 if (!nft_trans_set_update(trans) &&
9553 nft_set_is_anonymous(nft_trans_set(trans)) &&
9554 !nft_trans_set_bound(trans)) {
9555 pr_warn_once("nftables ruleset with unbound set\n");
9559 case NFT_MSG_NEWCHAIN:
9560 if (!nft_trans_chain_update(trans) &&
9561 nft_chain_binding(nft_trans_chain(trans)) &&
9562 !nft_trans_chain_bound(trans)) {
9563 pr_warn_once("nftables ruleset with unbound chain\n");
9570 /* 0. Validate ruleset, otherwise roll back for error reporting. */
9571 if (nf_tables_validate(net) < 0)
9574 err = nft_flow_rule_offload_commit(net);
9578 /* 1. Allocate space for next generation rules_gen_X[] */
9579 list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
9582 ret = nf_tables_commit_audit_alloc(&adl, trans->ctx.table);
9584 nf_tables_commit_chain_prepare_cancel(net);
9585 nf_tables_commit_audit_free(&adl);
9588 if (trans->msg_type == NFT_MSG_NEWRULE ||
9589 trans->msg_type == NFT_MSG_DELRULE) {
9590 chain = trans->ctx.chain;
9592 ret = nf_tables_commit_chain_prepare(net, chain);
9594 nf_tables_commit_chain_prepare_cancel(net);
9595 nf_tables_commit_audit_free(&adl);
9601 /* step 2. Make rules_gen_X visible to packet path */
9602 list_for_each_entry(table, &nft_net->tables, list) {
9603 list_for_each_entry(chain, &table->chains, list)
9604 nf_tables_commit_chain(net, chain);
9608 * Bump generation counter, invalidate any dump in progress.
9609 * Cannot fail after this point.
9611 base_seq = READ_ONCE(nft_net->base_seq);
9612 while (++base_seq == 0)
9615 WRITE_ONCE(nft_net->base_seq, base_seq);
9617 /* step 3. Start new generation, rules_gen_X now in use. */
9618 net->nft.gencursor = nft_gencursor_next(net);
9620 list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
9621 nf_tables_commit_audit_collect(&adl, trans->ctx.table,
9623 switch (trans->msg_type) {
9624 case NFT_MSG_NEWTABLE:
9625 if (nft_trans_table_update(trans)) {
9626 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
9627 nft_trans_destroy(trans);
9630 if (trans->ctx.table->flags & NFT_TABLE_F_DORMANT)
9631 nf_tables_table_disable(net, trans->ctx.table);
9633 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
9635 nft_clear(net, trans->ctx.table);
9637 nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
9638 nft_trans_destroy(trans);
9640 case NFT_MSG_DELTABLE:
9641 case NFT_MSG_DESTROYTABLE:
9642 list_del_rcu(&trans->ctx.table->list);
9643 nf_tables_table_notify(&trans->ctx, trans->msg_type);
9645 case NFT_MSG_NEWCHAIN:
9646 if (nft_trans_chain_update(trans)) {
9647 nft_chain_commit_update(trans);
9648 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN,
9649 &nft_trans_chain_hooks(trans));
9650 list_splice(&nft_trans_chain_hooks(trans),
9651 &nft_trans_basechain(trans)->hook_list);
9652 /* trans destroyed after rcu grace period */
9654 nft_chain_commit_drop_policy(trans);
9655 nft_clear(net, trans->ctx.chain);
9656 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN, NULL);
9657 nft_trans_destroy(trans);
9660 case NFT_MSG_DELCHAIN:
9661 case NFT_MSG_DESTROYCHAIN:
9662 if (nft_trans_chain_update(trans)) {
9663 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN,
9664 &nft_trans_chain_hooks(trans));
9665 nft_netdev_unregister_hooks(net,
9666 &nft_trans_chain_hooks(trans),
9669 nft_chain_del(trans->ctx.chain);
9670 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN,
9672 nf_tables_unregister_hook(trans->ctx.net,
9677 case NFT_MSG_NEWRULE:
9678 nft_clear(trans->ctx.net, nft_trans_rule(trans));
9679 nf_tables_rule_notify(&trans->ctx,
9680 nft_trans_rule(trans),
9682 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
9683 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
9685 nft_trans_destroy(trans);
9687 case NFT_MSG_DELRULE:
9688 case NFT_MSG_DESTROYRULE:
9689 list_del_rcu(&nft_trans_rule(trans)->list);
9690 nf_tables_rule_notify(&trans->ctx,
9691 nft_trans_rule(trans),
9693 nft_rule_expr_deactivate(&trans->ctx,
9694 nft_trans_rule(trans),
9697 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
9698 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
9700 case NFT_MSG_NEWSET:
9701 if (nft_trans_set_update(trans)) {
9702 struct nft_set *set = nft_trans_set(trans);
9704 WRITE_ONCE(set->timeout, nft_trans_set_timeout(trans));
9705 WRITE_ONCE(set->gc_int, nft_trans_set_gc_int(trans));
9707 if (nft_trans_set_size(trans))
9708 WRITE_ONCE(set->size, nft_trans_set_size(trans));
9710 nft_clear(net, nft_trans_set(trans));
9711 /* This avoids hitting -EBUSY when deleting the table
9712 * from the transaction.
9714 if (nft_set_is_anonymous(nft_trans_set(trans)) &&
9715 !list_empty(&nft_trans_set(trans)->bindings))
9716 trans->ctx.table->use--;
9718 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
9719 NFT_MSG_NEWSET, GFP_KERNEL);
9720 nft_trans_destroy(trans);
9722 case NFT_MSG_DELSET:
9723 case NFT_MSG_DESTROYSET:
9724 list_del_rcu(&nft_trans_set(trans)->list);
9725 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
9726 trans->msg_type, GFP_KERNEL);
9728 case NFT_MSG_NEWSETELEM:
9729 te = (struct nft_trans_elem *)trans->data;
9731 nft_setelem_activate(net, te->set, &te->elem);
9732 nf_tables_setelem_notify(&trans->ctx, te->set,
9734 NFT_MSG_NEWSETELEM);
9735 if (te->set->ops->commit &&
9736 list_empty(&te->set->pending_update)) {
9737 list_add_tail(&te->set->pending_update,
9740 nft_trans_destroy(trans);
9742 case NFT_MSG_DELSETELEM:
9743 case NFT_MSG_DESTROYSETELEM:
9744 te = (struct nft_trans_elem *)trans->data;
9746 nf_tables_setelem_notify(&trans->ctx, te->set,
9749 nft_setelem_remove(net, te->set, &te->elem);
9750 if (!nft_setelem_is_catchall(te->set, &te->elem)) {
9751 atomic_dec(&te->set->nelems);
9754 if (te->set->ops->commit &&
9755 list_empty(&te->set->pending_update)) {
9756 list_add_tail(&te->set->pending_update,
9760 case NFT_MSG_NEWOBJ:
9761 if (nft_trans_obj_update(trans)) {
9762 nft_obj_commit_update(trans);
9763 nf_tables_obj_notify(&trans->ctx,
9764 nft_trans_obj(trans),
9767 nft_clear(net, nft_trans_obj(trans));
9768 nf_tables_obj_notify(&trans->ctx,
9769 nft_trans_obj(trans),
9771 nft_trans_destroy(trans);
9774 case NFT_MSG_DELOBJ:
9775 case NFT_MSG_DESTROYOBJ:
9776 nft_obj_del(nft_trans_obj(trans));
9777 nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
9780 case NFT_MSG_NEWFLOWTABLE:
9781 if (nft_trans_flowtable_update(trans)) {
9782 nft_trans_flowtable(trans)->data.flags =
9783 nft_trans_flowtable_flags(trans);
9784 nf_tables_flowtable_notify(&trans->ctx,
9785 nft_trans_flowtable(trans),
9786 &nft_trans_flowtable_hooks(trans),
9787 NFT_MSG_NEWFLOWTABLE);
9788 list_splice(&nft_trans_flowtable_hooks(trans),
9789 &nft_trans_flowtable(trans)->hook_list);
9791 nft_clear(net, nft_trans_flowtable(trans));
9792 nf_tables_flowtable_notify(&trans->ctx,
9793 nft_trans_flowtable(trans),
9795 NFT_MSG_NEWFLOWTABLE);
9797 nft_trans_destroy(trans);
9799 case NFT_MSG_DELFLOWTABLE:
9800 case NFT_MSG_DESTROYFLOWTABLE:
9801 if (nft_trans_flowtable_update(trans)) {
9802 nf_tables_flowtable_notify(&trans->ctx,
9803 nft_trans_flowtable(trans),
9804 &nft_trans_flowtable_hooks(trans),
9806 nft_unregister_flowtable_net_hooks(net,
9807 &nft_trans_flowtable_hooks(trans));
9809 list_del_rcu(&nft_trans_flowtable(trans)->list);
9810 nf_tables_flowtable_notify(&trans->ctx,
9811 nft_trans_flowtable(trans),
9814 nft_unregister_flowtable_net_hooks(net,
9815 &nft_trans_flowtable(trans)->hook_list);
9821 nft_set_commit_update(&set_update_list);
9823 nft_commit_notify(net, NETLINK_CB(skb).portid);
9824 nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
9825 nf_tables_commit_audit_log(&adl, nft_net->base_seq);
9826 nf_tables_commit_release(net);
9831 static void nf_tables_module_autoload(struct net *net)
9833 struct nftables_pernet *nft_net = nft_pernet(net);
9834 struct nft_module_request *req, *next;
9835 LIST_HEAD(module_list);
9837 list_splice_init(&nft_net->module_list, &module_list);
9838 mutex_unlock(&nft_net->commit_mutex);
9839 list_for_each_entry_safe(req, next, &module_list, list) {
9840 request_module("%s", req->module);
9843 mutex_lock(&nft_net->commit_mutex);
9844 list_splice(&module_list, &nft_net->module_list);
9847 static void nf_tables_abort_release(struct nft_trans *trans)
9849 switch (trans->msg_type) {
9850 case NFT_MSG_NEWTABLE:
9851 nf_tables_table_destroy(&trans->ctx);
9853 case NFT_MSG_NEWCHAIN:
9854 if (nft_trans_chain_update(trans))
9855 nft_hooks_destroy(&nft_trans_chain_hooks(trans));
9857 nf_tables_chain_destroy(&trans->ctx);
9859 case NFT_MSG_NEWRULE:
9860 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
9862 case NFT_MSG_NEWSET:
9863 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
9865 case NFT_MSG_NEWSETELEM:
9866 nft_set_elem_destroy(nft_trans_elem_set(trans),
9867 nft_trans_elem(trans).priv, true);
9869 case NFT_MSG_NEWOBJ:
9870 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
9872 case NFT_MSG_NEWFLOWTABLE:
9873 if (nft_trans_flowtable_update(trans))
9874 nft_hooks_destroy(&nft_trans_flowtable_hooks(trans));
9876 nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
9882 static void nft_set_abort_update(struct list_head *set_update_list)
9884 struct nft_set *set, *next;
9886 list_for_each_entry_safe(set, next, set_update_list, pending_update) {
9887 list_del_init(&set->pending_update);
9889 if (!set->ops->abort)
9892 set->ops->abort(set);
9896 static int __nf_tables_abort(struct net *net, enum nfnl_abort_action action)
9898 struct nftables_pernet *nft_net = nft_pernet(net);
9899 struct nft_trans *trans, *next;
9900 LIST_HEAD(set_update_list);
9901 struct nft_trans_elem *te;
9903 if (action == NFNL_ABORT_VALIDATE &&
9904 nf_tables_validate(net) < 0)
9907 list_for_each_entry_safe_reverse(trans, next, &nft_net->commit_list,
9909 switch (trans->msg_type) {
9910 case NFT_MSG_NEWTABLE:
9911 if (nft_trans_table_update(trans)) {
9912 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
9913 nft_trans_destroy(trans);
9916 if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_DORMANT) {
9917 nf_tables_table_disable(net, trans->ctx.table);
9918 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
9919 } else if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_AWAKEN) {
9920 trans->ctx.table->flags &= ~NFT_TABLE_F_DORMANT;
9922 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
9923 nft_trans_destroy(trans);
9925 list_del_rcu(&trans->ctx.table->list);
9928 case NFT_MSG_DELTABLE:
9929 case NFT_MSG_DESTROYTABLE:
9930 nft_clear(trans->ctx.net, trans->ctx.table);
9931 nft_trans_destroy(trans);
9933 case NFT_MSG_NEWCHAIN:
9934 if (nft_trans_chain_update(trans)) {
9935 nft_netdev_unregister_hooks(net,
9936 &nft_trans_chain_hooks(trans),
9938 free_percpu(nft_trans_chain_stats(trans));
9939 kfree(nft_trans_chain_name(trans));
9940 nft_trans_destroy(trans);
9942 if (nft_trans_chain_bound(trans)) {
9943 nft_trans_destroy(trans);
9946 trans->ctx.table->use--;
9947 nft_chain_del(trans->ctx.chain);
9948 nf_tables_unregister_hook(trans->ctx.net,
9953 case NFT_MSG_DELCHAIN:
9954 case NFT_MSG_DESTROYCHAIN:
9955 if (nft_trans_chain_update(trans)) {
9956 list_splice(&nft_trans_chain_hooks(trans),
9957 &nft_trans_basechain(trans)->hook_list);
9959 trans->ctx.table->use++;
9960 nft_clear(trans->ctx.net, trans->ctx.chain);
9962 nft_trans_destroy(trans);
9964 case NFT_MSG_NEWRULE:
9965 if (nft_trans_rule_bound(trans)) {
9966 nft_trans_destroy(trans);
9969 trans->ctx.chain->use--;
9970 list_del_rcu(&nft_trans_rule(trans)->list);
9971 nft_rule_expr_deactivate(&trans->ctx,
9972 nft_trans_rule(trans),
9974 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
9975 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
9977 case NFT_MSG_DELRULE:
9978 case NFT_MSG_DESTROYRULE:
9979 trans->ctx.chain->use++;
9980 nft_clear(trans->ctx.net, nft_trans_rule(trans));
9981 nft_rule_expr_activate(&trans->ctx, nft_trans_rule(trans));
9982 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
9983 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
9985 nft_trans_destroy(trans);
9987 case NFT_MSG_NEWSET:
9988 if (nft_trans_set_update(trans)) {
9989 nft_trans_destroy(trans);
9992 trans->ctx.table->use--;
9993 if (nft_trans_set_bound(trans)) {
9994 nft_trans_destroy(trans);
9997 list_del_rcu(&nft_trans_set(trans)->list);
9999 case NFT_MSG_DELSET:
10000 case NFT_MSG_DESTROYSET:
10001 trans->ctx.table->use++;
10002 nft_clear(trans->ctx.net, nft_trans_set(trans));
10003 if (nft_trans_set(trans)->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
10004 nft_map_activate(&trans->ctx, nft_trans_set(trans));
10006 nft_trans_destroy(trans);
10008 case NFT_MSG_NEWSETELEM:
10009 if (nft_trans_elem_set_bound(trans)) {
10010 nft_trans_destroy(trans);
10013 te = (struct nft_trans_elem *)trans->data;
10014 nft_setelem_remove(net, te->set, &te->elem);
10015 if (!nft_setelem_is_catchall(te->set, &te->elem))
10016 atomic_dec(&te->set->nelems);
10018 if (te->set->ops->abort &&
10019 list_empty(&te->set->pending_update)) {
10020 list_add_tail(&te->set->pending_update,
10024 case NFT_MSG_DELSETELEM:
10025 case NFT_MSG_DESTROYSETELEM:
10026 te = (struct nft_trans_elem *)trans->data;
10028 nft_setelem_data_activate(net, te->set, &te->elem);
10029 nft_setelem_activate(net, te->set, &te->elem);
10030 if (!nft_setelem_is_catchall(te->set, &te->elem))
10033 if (te->set->ops->abort &&
10034 list_empty(&te->set->pending_update)) {
10035 list_add_tail(&te->set->pending_update,
10038 nft_trans_destroy(trans);
10040 case NFT_MSG_NEWOBJ:
10041 if (nft_trans_obj_update(trans)) {
10042 nft_obj_destroy(&trans->ctx, nft_trans_obj_newobj(trans));
10043 nft_trans_destroy(trans);
10045 trans->ctx.table->use--;
10046 nft_obj_del(nft_trans_obj(trans));
10049 case NFT_MSG_DELOBJ:
10050 case NFT_MSG_DESTROYOBJ:
10051 trans->ctx.table->use++;
10052 nft_clear(trans->ctx.net, nft_trans_obj(trans));
10053 nft_trans_destroy(trans);
10055 case NFT_MSG_NEWFLOWTABLE:
10056 if (nft_trans_flowtable_update(trans)) {
10057 nft_unregister_flowtable_net_hooks(net,
10058 &nft_trans_flowtable_hooks(trans));
10060 trans->ctx.table->use--;
10061 list_del_rcu(&nft_trans_flowtable(trans)->list);
10062 nft_unregister_flowtable_net_hooks(net,
10063 &nft_trans_flowtable(trans)->hook_list);
10066 case NFT_MSG_DELFLOWTABLE:
10067 case NFT_MSG_DESTROYFLOWTABLE:
10068 if (nft_trans_flowtable_update(trans)) {
10069 list_splice(&nft_trans_flowtable_hooks(trans),
10070 &nft_trans_flowtable(trans)->hook_list);
10072 trans->ctx.table->use++;
10073 nft_clear(trans->ctx.net, nft_trans_flowtable(trans));
10075 nft_trans_destroy(trans);
10080 nft_set_abort_update(&set_update_list);
10084 list_for_each_entry_safe_reverse(trans, next,
10085 &nft_net->commit_list, list) {
10086 nft_trans_list_del(trans);
10087 nf_tables_abort_release(trans);
10090 if (action == NFNL_ABORT_AUTOLOAD)
10091 nf_tables_module_autoload(net);
10093 nf_tables_module_autoload_cleanup(net);
10098 static int nf_tables_abort(struct net *net, struct sk_buff *skb,
10099 enum nfnl_abort_action action)
10101 struct nftables_pernet *nft_net = nft_pernet(net);
10102 int ret = __nf_tables_abort(net, action);
10104 mutex_unlock(&nft_net->commit_mutex);
10109 static bool nf_tables_valid_genid(struct net *net, u32 genid)
10111 struct nftables_pernet *nft_net = nft_pernet(net);
10114 mutex_lock(&nft_net->commit_mutex);
10116 genid_ok = genid == 0 || nft_net->base_seq == genid;
10118 mutex_unlock(&nft_net->commit_mutex);
10120 /* else, commit mutex has to be released by commit or abort function */
10124 static const struct nfnetlink_subsystem nf_tables_subsys = {
10125 .name = "nf_tables",
10126 .subsys_id = NFNL_SUBSYS_NFTABLES,
10127 .cb_count = NFT_MSG_MAX,
10128 .cb = nf_tables_cb,
10129 .commit = nf_tables_commit,
10130 .abort = nf_tables_abort,
10131 .valid_genid = nf_tables_valid_genid,
10132 .owner = THIS_MODULE,
10135 int nft_chain_validate_dependency(const struct nft_chain *chain,
10136 enum nft_chain_types type)
10138 const struct nft_base_chain *basechain;
10140 if (nft_is_base_chain(chain)) {
10141 basechain = nft_base_chain(chain);
10142 if (basechain->type->type != type)
10143 return -EOPNOTSUPP;
10147 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
10149 int nft_chain_validate_hooks(const struct nft_chain *chain,
10150 unsigned int hook_flags)
10152 struct nft_base_chain *basechain;
10154 if (nft_is_base_chain(chain)) {
10155 basechain = nft_base_chain(chain);
10157 if ((1 << basechain->ops.hooknum) & hook_flags)
10160 return -EOPNOTSUPP;
10165 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
10168 * Loop detection - walk through the ruleset beginning at the destination chain
10169 * of a new jump until either the source chain is reached (loop) or all
10170 * reachable chains have been traversed.
10172 * The loop check is performed whenever a new jump verdict is added to an
10173 * expression or verdict map or a verdict map is bound to a new chain.
10176 static int nf_tables_check_loops(const struct nft_ctx *ctx,
10177 const struct nft_chain *chain);
10179 static int nft_check_loops(const struct nft_ctx *ctx,
10180 const struct nft_set_ext *ext)
10182 const struct nft_data *data;
10185 data = nft_set_ext_data(ext);
10186 switch (data->verdict.code) {
10189 ret = nf_tables_check_loops(ctx, data->verdict.chain);
10199 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
10200 struct nft_set *set,
10201 const struct nft_set_iter *iter,
10202 struct nft_set_elem *elem)
10204 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
10206 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
10207 *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
10210 return nft_check_loops(ctx, ext);
10213 static int nft_set_catchall_loops(const struct nft_ctx *ctx,
10214 struct nft_set *set)
10216 u8 genmask = nft_genmask_next(ctx->net);
10217 struct nft_set_elem_catchall *catchall;
10218 struct nft_set_ext *ext;
10221 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
10222 ext = nft_set_elem_ext(set, catchall->elem);
10223 if (!nft_set_elem_active(ext, genmask))
10226 ret = nft_check_loops(ctx, ext);
10234 static int nf_tables_check_loops(const struct nft_ctx *ctx,
10235 const struct nft_chain *chain)
10237 const struct nft_rule *rule;
10238 const struct nft_expr *expr, *last;
10239 struct nft_set *set;
10240 struct nft_set_binding *binding;
10241 struct nft_set_iter iter;
10243 if (ctx->chain == chain)
10246 list_for_each_entry(rule, &chain->rules, list) {
10247 nft_rule_for_each_expr(expr, last, rule) {
10248 struct nft_immediate_expr *priv;
10249 const struct nft_data *data;
10252 if (strcmp(expr->ops->type->name, "immediate"))
10255 priv = nft_expr_priv(expr);
10256 if (priv->dreg != NFT_REG_VERDICT)
10259 data = &priv->data;
10260 switch (data->verdict.code) {
10263 err = nf_tables_check_loops(ctx,
10264 data->verdict.chain);
10274 list_for_each_entry(set, &ctx->table->sets, list) {
10275 if (!nft_is_active_next(ctx->net, set))
10277 if (!(set->flags & NFT_SET_MAP) ||
10278 set->dtype != NFT_DATA_VERDICT)
10281 list_for_each_entry(binding, &set->bindings, list) {
10282 if (!(binding->flags & NFT_SET_MAP) ||
10283 binding->chain != chain)
10286 iter.genmask = nft_genmask_next(ctx->net);
10290 iter.fn = nf_tables_loop_check_setelem;
10292 set->ops->walk(ctx, set, &iter);
10294 iter.err = nft_set_catchall_loops(ctx, set);
10305 * nft_parse_u32_check - fetch u32 attribute and check for maximum value
10307 * @attr: netlink attribute to fetch value from
10308 * @max: maximum value to be stored in dest
10309 * @dest: pointer to the variable
10311 * Parse, check and store a given u32 netlink attribute into variable.
10312 * This function returns -ERANGE if the value goes over maximum value.
10313 * Otherwise a 0 is returned and the attribute value is stored in the
10314 * destination variable.
10316 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
10320 val = ntohl(nla_get_be32(attr));
10327 EXPORT_SYMBOL_GPL(nft_parse_u32_check);
10329 static int nft_parse_register(const struct nlattr *attr, u32 *preg)
10333 reg = ntohl(nla_get_be32(attr));
10335 case NFT_REG_VERDICT...NFT_REG_4:
10336 *preg = reg * NFT_REG_SIZE / NFT_REG32_SIZE;
10338 case NFT_REG32_00...NFT_REG32_15:
10339 *preg = reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
10349 * nft_dump_register - dump a register value to a netlink attribute
10351 * @skb: socket buffer
10352 * @attr: attribute number
10353 * @reg: register number
10355 * Construct a netlink attribute containing the register number. For
10356 * compatibility reasons, register numbers being a multiple of 4 are
10357 * translated to the corresponding 128 bit register numbers.
10359 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
10361 if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
10362 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
10364 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
10366 return nla_put_be32(skb, attr, htonl(reg));
10368 EXPORT_SYMBOL_GPL(nft_dump_register);
10370 static int nft_validate_register_load(enum nft_registers reg, unsigned int len)
10372 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
10376 if (reg * NFT_REG32_SIZE + len > sizeof_field(struct nft_regs, data))
10382 int nft_parse_register_load(const struct nlattr *attr, u8 *sreg, u32 len)
10387 err = nft_parse_register(attr, ®);
10391 err = nft_validate_register_load(reg, len);
10398 EXPORT_SYMBOL_GPL(nft_parse_register_load);
10400 static int nft_validate_register_store(const struct nft_ctx *ctx,
10401 enum nft_registers reg,
10402 const struct nft_data *data,
10403 enum nft_data_types type,
10409 case NFT_REG_VERDICT:
10410 if (type != NFT_DATA_VERDICT)
10413 if (data != NULL &&
10414 (data->verdict.code == NFT_GOTO ||
10415 data->verdict.code == NFT_JUMP)) {
10416 err = nf_tables_check_loops(ctx, data->verdict.chain);
10423 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
10427 if (reg * NFT_REG32_SIZE + len >
10428 sizeof_field(struct nft_regs, data))
10431 if (data != NULL && type != NFT_DATA_VALUE)
10437 int nft_parse_register_store(const struct nft_ctx *ctx,
10438 const struct nlattr *attr, u8 *dreg,
10439 const struct nft_data *data,
10440 enum nft_data_types type, unsigned int len)
10445 err = nft_parse_register(attr, ®);
10449 err = nft_validate_register_store(ctx, reg, data, type, len);
10456 EXPORT_SYMBOL_GPL(nft_parse_register_store);
10458 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
10459 [NFTA_VERDICT_CODE] = { .type = NLA_U32 },
10460 [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING,
10461 .len = NFT_CHAIN_MAXNAMELEN - 1 },
10462 [NFTA_VERDICT_CHAIN_ID] = { .type = NLA_U32 },
10465 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
10466 struct nft_data_desc *desc, const struct nlattr *nla)
10468 u8 genmask = nft_genmask_next(ctx->net);
10469 struct nlattr *tb[NFTA_VERDICT_MAX + 1];
10470 struct nft_chain *chain;
10473 err = nla_parse_nested_deprecated(tb, NFTA_VERDICT_MAX, nla,
10474 nft_verdict_policy, NULL);
10478 if (!tb[NFTA_VERDICT_CODE])
10480 data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
10482 switch (data->verdict.code) {
10484 switch (data->verdict.code & NF_VERDICT_MASK) {
10499 if (tb[NFTA_VERDICT_CHAIN]) {
10500 chain = nft_chain_lookup(ctx->net, ctx->table,
10501 tb[NFTA_VERDICT_CHAIN],
10503 } else if (tb[NFTA_VERDICT_CHAIN_ID]) {
10504 chain = nft_chain_lookup_byid(ctx->net, ctx->table,
10505 tb[NFTA_VERDICT_CHAIN_ID]);
10507 return PTR_ERR(chain);
10513 return PTR_ERR(chain);
10514 if (nft_is_base_chain(chain))
10515 return -EOPNOTSUPP;
10516 if (nft_chain_is_bound(chain))
10518 if (desc->flags & NFT_DATA_DESC_SETELEM &&
10519 chain->flags & NFT_CHAIN_BINDING)
10523 data->verdict.chain = chain;
10527 desc->len = sizeof(data->verdict);
10532 static void nft_verdict_uninit(const struct nft_data *data)
10534 struct nft_chain *chain;
10536 switch (data->verdict.code) {
10539 chain = data->verdict.chain;
10545 int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
10547 struct nlattr *nest;
10549 nest = nla_nest_start_noflag(skb, type);
10551 goto nla_put_failure;
10553 if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
10554 goto nla_put_failure;
10559 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
10561 goto nla_put_failure;
10563 nla_nest_end(skb, nest);
10570 static int nft_value_init(const struct nft_ctx *ctx,
10571 struct nft_data *data, struct nft_data_desc *desc,
10572 const struct nlattr *nla)
10576 len = nla_len(nla);
10579 if (len > desc->size)
10582 if (len != desc->len)
10588 nla_memcpy(data->data, nla, len);
10593 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
10596 return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
10599 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
10600 [NFTA_DATA_VALUE] = { .type = NLA_BINARY },
10601 [NFTA_DATA_VERDICT] = { .type = NLA_NESTED },
10605 * nft_data_init - parse nf_tables data netlink attributes
10607 * @ctx: context of the expression using the data
10608 * @data: destination struct nft_data
10609 * @desc: data description
10610 * @nla: netlink attribute containing data
10612 * Parse the netlink data attributes and initialize a struct nft_data.
10613 * The type and length of data are returned in the data description.
10615 * The caller can indicate that it only wants to accept data of type
10616 * NFT_DATA_VALUE by passing NULL for the ctx argument.
10618 int nft_data_init(const struct nft_ctx *ctx, struct nft_data *data,
10619 struct nft_data_desc *desc, const struct nlattr *nla)
10621 struct nlattr *tb[NFTA_DATA_MAX + 1];
10624 if (WARN_ON_ONCE(!desc->size))
10627 err = nla_parse_nested_deprecated(tb, NFTA_DATA_MAX, nla,
10628 nft_data_policy, NULL);
10632 if (tb[NFTA_DATA_VALUE]) {
10633 if (desc->type != NFT_DATA_VALUE)
10636 err = nft_value_init(ctx, data, desc, tb[NFTA_DATA_VALUE]);
10637 } else if (tb[NFTA_DATA_VERDICT] && ctx != NULL) {
10638 if (desc->type != NFT_DATA_VERDICT)
10641 err = nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
10648 EXPORT_SYMBOL_GPL(nft_data_init);
10651 * nft_data_release - release a nft_data item
10653 * @data: struct nft_data to release
10654 * @type: type of data
10656 * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
10657 * all others need to be released by calling this function.
10659 void nft_data_release(const struct nft_data *data, enum nft_data_types type)
10661 if (type < NFT_DATA_VERDICT)
10664 case NFT_DATA_VERDICT:
10665 return nft_verdict_uninit(data);
10670 EXPORT_SYMBOL_GPL(nft_data_release);
10672 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
10673 enum nft_data_types type, unsigned int len)
10675 struct nlattr *nest;
10678 nest = nla_nest_start_noflag(skb, attr);
10683 case NFT_DATA_VALUE:
10684 err = nft_value_dump(skb, data, len);
10686 case NFT_DATA_VERDICT:
10687 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
10694 nla_nest_end(skb, nest);
10697 EXPORT_SYMBOL_GPL(nft_data_dump);
10699 int __nft_release_basechain(struct nft_ctx *ctx)
10701 struct nft_rule *rule, *nr;
10703 if (WARN_ON(!nft_is_base_chain(ctx->chain)))
10706 nf_tables_unregister_hook(ctx->net, ctx->chain->table, ctx->chain);
10707 list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
10708 list_del(&rule->list);
10710 nf_tables_rule_release(ctx, rule);
10712 nft_chain_del(ctx->chain);
10714 nf_tables_chain_destroy(ctx);
10718 EXPORT_SYMBOL_GPL(__nft_release_basechain);
10720 static void __nft_release_hook(struct net *net, struct nft_table *table)
10722 struct nft_flowtable *flowtable;
10723 struct nft_chain *chain;
10725 list_for_each_entry(chain, &table->chains, list)
10726 __nf_tables_unregister_hook(net, table, chain, true);
10727 list_for_each_entry(flowtable, &table->flowtables, list)
10728 __nft_unregister_flowtable_net_hooks(net, &flowtable->hook_list,
10732 static void __nft_release_hooks(struct net *net)
10734 struct nftables_pernet *nft_net = nft_pernet(net);
10735 struct nft_table *table;
10737 list_for_each_entry(table, &nft_net->tables, list) {
10738 if (nft_table_has_owner(table))
10741 __nft_release_hook(net, table);
10745 static void __nft_release_table(struct net *net, struct nft_table *table)
10747 struct nft_flowtable *flowtable, *nf;
10748 struct nft_chain *chain, *nc;
10749 struct nft_object *obj, *ne;
10750 struct nft_rule *rule, *nr;
10751 struct nft_set *set, *ns;
10752 struct nft_ctx ctx = {
10754 .family = NFPROTO_NETDEV,
10757 ctx.family = table->family;
10759 list_for_each_entry(chain, &table->chains, list) {
10761 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
10762 list_del(&rule->list);
10764 nf_tables_rule_release(&ctx, rule);
10767 list_for_each_entry_safe(flowtable, nf, &table->flowtables, list) {
10768 list_del(&flowtable->list);
10770 nf_tables_flowtable_destroy(flowtable);
10772 list_for_each_entry_safe(set, ns, &table->sets, list) {
10773 list_del(&set->list);
10775 if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
10776 nft_map_deactivate(&ctx, set);
10778 nft_set_destroy(&ctx, set);
10780 list_for_each_entry_safe(obj, ne, &table->objects, list) {
10783 nft_obj_destroy(&ctx, obj);
10785 list_for_each_entry_safe(chain, nc, &table->chains, list) {
10787 nft_chain_del(chain);
10789 nf_tables_chain_destroy(&ctx);
10791 nf_tables_table_destroy(&ctx);
10794 static void __nft_release_tables(struct net *net)
10796 struct nftables_pernet *nft_net = nft_pernet(net);
10797 struct nft_table *table, *nt;
10799 list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
10800 if (nft_table_has_owner(table))
10803 list_del(&table->list);
10805 __nft_release_table(net, table);
10809 static int nft_rcv_nl_event(struct notifier_block *this, unsigned long event,
10812 struct nft_table *table, *to_delete[8];
10813 struct nftables_pernet *nft_net;
10814 struct netlink_notify *n = ptr;
10815 struct net *net = n->net;
10816 unsigned int deleted;
10817 bool restart = false;
10819 if (event != NETLINK_URELEASE || n->protocol != NETLINK_NETFILTER)
10820 return NOTIFY_DONE;
10822 nft_net = nft_pernet(net);
10824 mutex_lock(&nft_net->commit_mutex);
10825 if (!list_empty(&nf_tables_destroy_list))
10828 list_for_each_entry(table, &nft_net->tables, list) {
10829 if (nft_table_has_owner(table) &&
10830 n->portid == table->nlpid) {
10831 __nft_release_hook(net, table);
10832 list_del_rcu(&table->list);
10833 to_delete[deleted++] = table;
10834 if (deleted >= ARRAY_SIZE(to_delete))
10839 restart = deleted >= ARRAY_SIZE(to_delete);
10842 __nft_release_table(net, to_delete[--deleted]);
10847 mutex_unlock(&nft_net->commit_mutex);
10849 return NOTIFY_DONE;
10852 static struct notifier_block nft_nl_notifier = {
10853 .notifier_call = nft_rcv_nl_event,
10856 static int __net_init nf_tables_init_net(struct net *net)
10858 struct nftables_pernet *nft_net = nft_pernet(net);
10860 INIT_LIST_HEAD(&nft_net->tables);
10861 INIT_LIST_HEAD(&nft_net->commit_list);
10862 INIT_LIST_HEAD(&nft_net->binding_list);
10863 INIT_LIST_HEAD(&nft_net->module_list);
10864 INIT_LIST_HEAD(&nft_net->notify_list);
10865 mutex_init(&nft_net->commit_mutex);
10866 nft_net->base_seq = 1;
10871 static void __net_exit nf_tables_pre_exit_net(struct net *net)
10873 struct nftables_pernet *nft_net = nft_pernet(net);
10875 mutex_lock(&nft_net->commit_mutex);
10876 __nft_release_hooks(net);
10877 mutex_unlock(&nft_net->commit_mutex);
10880 static void __net_exit nf_tables_exit_net(struct net *net)
10882 struct nftables_pernet *nft_net = nft_pernet(net);
10884 mutex_lock(&nft_net->commit_mutex);
10885 if (!list_empty(&nft_net->commit_list) ||
10886 !list_empty(&nft_net->module_list))
10887 __nf_tables_abort(net, NFNL_ABORT_NONE);
10888 __nft_release_tables(net);
10889 mutex_unlock(&nft_net->commit_mutex);
10890 WARN_ON_ONCE(!list_empty(&nft_net->tables));
10891 WARN_ON_ONCE(!list_empty(&nft_net->module_list));
10892 WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
10895 static struct pernet_operations nf_tables_net_ops = {
10896 .init = nf_tables_init_net,
10897 .pre_exit = nf_tables_pre_exit_net,
10898 .exit = nf_tables_exit_net,
10899 .id = &nf_tables_net_id,
10900 .size = sizeof(struct nftables_pernet),
10903 static int __init nf_tables_module_init(void)
10907 err = register_pernet_subsys(&nf_tables_net_ops);
10911 err = nft_chain_filter_init();
10913 goto err_chain_filter;
10915 err = nf_tables_core_module_init();
10917 goto err_core_module;
10919 err = register_netdevice_notifier(&nf_tables_flowtable_notifier);
10921 goto err_netdev_notifier;
10923 err = rhltable_init(&nft_objname_ht, &nft_objname_ht_params);
10925 goto err_rht_objname;
10927 err = nft_offload_init();
10931 err = netlink_register_notifier(&nft_nl_notifier);
10933 goto err_netlink_notifier;
10936 err = nfnetlink_subsys_register(&nf_tables_subsys);
10938 goto err_nfnl_subsys;
10940 nft_chain_route_init();
10945 netlink_unregister_notifier(&nft_nl_notifier);
10946 err_netlink_notifier:
10947 nft_offload_exit();
10949 rhltable_destroy(&nft_objname_ht);
10951 unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
10952 err_netdev_notifier:
10953 nf_tables_core_module_exit();
10955 nft_chain_filter_fini();
10957 unregister_pernet_subsys(&nf_tables_net_ops);
10961 static void __exit nf_tables_module_exit(void)
10963 nfnetlink_subsys_unregister(&nf_tables_subsys);
10964 netlink_unregister_notifier(&nft_nl_notifier);
10965 nft_offload_exit();
10966 unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
10967 nft_chain_filter_fini();
10968 nft_chain_route_fini();
10969 unregister_pernet_subsys(&nf_tables_net_ops);
10970 cancel_work_sync(&trans_destroy_work);
10972 rhltable_destroy(&nft_objname_ht);
10973 nf_tables_core_module_exit();
10976 module_init(nf_tables_module_init);
10977 module_exit(nf_tables_module_exit);
10979 MODULE_LICENSE("GPL");
10980 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
10981 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);