2 * Copyright (c) 2007-2009 Patrick McHardy <kaber@trash.net>
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
8 * Development of this code funded by Astaro AG (http://www.astaro.com/)
11 #include <linux/module.h>
12 #include <linux/init.h>
13 #include <linux/list.h>
14 #include <linux/skbuff.h>
15 #include <linux/netlink.h>
16 #include <linux/vmalloc.h>
17 #include <linux/netfilter.h>
18 #include <linux/netfilter/nfnetlink.h>
19 #include <linux/netfilter/nf_tables.h>
20 #include <net/netfilter/nf_flow_table.h>
21 #include <net/netfilter/nf_tables_core.h>
22 #include <net/netfilter/nf_tables.h>
23 #include <net/net_namespace.h>
26 static LIST_HEAD(nf_tables_expressions);
27 static LIST_HEAD(nf_tables_objects);
28 static LIST_HEAD(nf_tables_flowtables);
29 static u64 table_handle;
31 static void nft_ctx_init(struct nft_ctx *ctx,
33 const struct sk_buff *skb,
34 const struct nlmsghdr *nlh,
36 struct nft_table *table,
37 struct nft_chain *chain,
38 const struct nlattr * const *nla)
45 ctx->portid = NETLINK_CB(skb).portid;
46 ctx->report = nlmsg_report(nlh);
47 ctx->seq = nlh->nlmsg_seq;
50 static struct nft_trans *nft_trans_alloc_gfp(const struct nft_ctx *ctx,
51 int msg_type, u32 size, gfp_t gfp)
53 struct nft_trans *trans;
55 trans = kzalloc(sizeof(struct nft_trans) + size, gfp);
59 trans->msg_type = msg_type;
65 static struct nft_trans *nft_trans_alloc(const struct nft_ctx *ctx,
66 int msg_type, u32 size)
68 return nft_trans_alloc_gfp(ctx, msg_type, size, GFP_KERNEL);
71 static void nft_trans_destroy(struct nft_trans *trans)
73 list_del(&trans->list);
77 /* removal requests are queued in the commit_list, but not acted upon
78 * until after all new rules are in place.
80 * Therefore, nf_register_net_hook(net, &nat_hook) runs before pending
81 * nf_unregister_net_hook().
83 * nf_register_net_hook thus fails if a nat hook is already in place
84 * even if the conflicting hook is about to be removed.
86 * If collision is detected, search commit_log for DELCHAIN matching
87 * the new nat hooknum; if we find one collision is temporary:
89 * Either transaction is aborted (new/colliding hook is removed), or
90 * transaction is committed (old hook is removed).
92 static bool nf_tables_allow_nat_conflict(const struct net *net,
93 const struct nf_hook_ops *ops)
95 const struct nft_trans *trans;
101 list_for_each_entry(trans, &net->nft.commit_list, list) {
102 const struct nf_hook_ops *pending_ops;
103 const struct nft_chain *pending;
105 if (trans->msg_type != NFT_MSG_NEWCHAIN &&
106 trans->msg_type != NFT_MSG_DELCHAIN)
109 pending = trans->ctx.chain;
110 if (!nft_is_base_chain(pending))
113 pending_ops = &nft_base_chain(pending)->ops;
114 if (pending_ops->nat_hook &&
115 pending_ops->pf == ops->pf &&
116 pending_ops->hooknum == ops->hooknum) {
117 /* other hook registration already pending? */
118 if (trans->msg_type == NFT_MSG_NEWCHAIN)
128 static int nf_tables_register_hook(struct net *net,
129 const struct nft_table *table,
130 struct nft_chain *chain)
132 struct nf_hook_ops *ops;
135 if (table->flags & NFT_TABLE_F_DORMANT ||
136 !nft_is_base_chain(chain))
139 ops = &nft_base_chain(chain)->ops;
140 ret = nf_register_net_hook(net, ops);
141 if (ret == -EBUSY && nf_tables_allow_nat_conflict(net, ops)) {
142 ops->nat_hook = false;
143 ret = nf_register_net_hook(net, ops);
144 ops->nat_hook = true;
150 static void nf_tables_unregister_hook(struct net *net,
151 const struct nft_table *table,
152 struct nft_chain *chain)
154 if (table->flags & NFT_TABLE_F_DORMANT ||
155 !nft_is_base_chain(chain))
158 nf_unregister_net_hook(net, &nft_base_chain(chain)->ops);
161 static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type)
163 struct nft_trans *trans;
165 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table));
169 if (msg_type == NFT_MSG_NEWTABLE)
170 nft_activate_next(ctx->net, ctx->table);
172 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
176 static int nft_deltable(struct nft_ctx *ctx)
180 err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE);
184 nft_deactivate_next(ctx->net, ctx->table);
188 static int nft_trans_chain_add(struct nft_ctx *ctx, int msg_type)
190 struct nft_trans *trans;
192 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain));
196 if (msg_type == NFT_MSG_NEWCHAIN)
197 nft_activate_next(ctx->net, ctx->chain);
199 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
203 static int nft_delchain(struct nft_ctx *ctx)
207 err = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN);
212 nft_deactivate_next(ctx->net, ctx->chain);
217 static void nft_rule_expr_activate(const struct nft_ctx *ctx,
218 struct nft_rule *rule)
220 struct nft_expr *expr;
222 expr = nft_expr_first(rule);
223 while (expr != nft_expr_last(rule) && expr->ops) {
224 if (expr->ops->activate)
225 expr->ops->activate(ctx, expr);
227 expr = nft_expr_next(expr);
231 static void nft_rule_expr_deactivate(const struct nft_ctx *ctx,
232 struct nft_rule *rule)
234 struct nft_expr *expr;
236 expr = nft_expr_first(rule);
237 while (expr != nft_expr_last(rule) && expr->ops) {
238 if (expr->ops->deactivate)
239 expr->ops->deactivate(ctx, expr);
241 expr = nft_expr_next(expr);
246 nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule)
248 /* You cannot delete the same rule twice */
249 if (nft_is_active_next(ctx->net, rule)) {
250 nft_deactivate_next(ctx->net, rule);
257 static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type,
258 struct nft_rule *rule)
260 struct nft_trans *trans;
262 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule));
266 if (msg_type == NFT_MSG_NEWRULE && ctx->nla[NFTA_RULE_ID] != NULL) {
267 nft_trans_rule_id(trans) =
268 ntohl(nla_get_be32(ctx->nla[NFTA_RULE_ID]));
270 nft_trans_rule(trans) = rule;
271 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
276 static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule)
278 struct nft_trans *trans;
281 trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule);
285 err = nf_tables_delrule_deactivate(ctx, rule);
287 nft_trans_destroy(trans);
290 nft_rule_expr_deactivate(ctx, rule);
295 static int nft_delrule_by_chain(struct nft_ctx *ctx)
297 struct nft_rule *rule;
300 list_for_each_entry(rule, &ctx->chain->rules, list) {
301 err = nft_delrule(ctx, rule);
308 static int nft_trans_set_add(struct nft_ctx *ctx, int msg_type,
311 struct nft_trans *trans;
313 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
317 if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] != NULL) {
318 nft_trans_set_id(trans) =
319 ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
320 nft_activate_next(ctx->net, set);
322 nft_trans_set(trans) = set;
323 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
328 static int nft_delset(struct nft_ctx *ctx, struct nft_set *set)
332 err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set);
336 nft_deactivate_next(ctx->net, set);
342 static int nft_trans_obj_add(struct nft_ctx *ctx, int msg_type,
343 struct nft_object *obj)
345 struct nft_trans *trans;
347 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_obj));
351 if (msg_type == NFT_MSG_NEWOBJ)
352 nft_activate_next(ctx->net, obj);
354 nft_trans_obj(trans) = obj;
355 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
360 static int nft_delobj(struct nft_ctx *ctx, struct nft_object *obj)
364 err = nft_trans_obj_add(ctx, NFT_MSG_DELOBJ, obj);
368 nft_deactivate_next(ctx->net, obj);
374 static int nft_trans_flowtable_add(struct nft_ctx *ctx, int msg_type,
375 struct nft_flowtable *flowtable)
377 struct nft_trans *trans;
379 trans = nft_trans_alloc(ctx, msg_type,
380 sizeof(struct nft_trans_flowtable));
384 if (msg_type == NFT_MSG_NEWFLOWTABLE)
385 nft_activate_next(ctx->net, flowtable);
387 nft_trans_flowtable(trans) = flowtable;
388 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
393 static int nft_delflowtable(struct nft_ctx *ctx,
394 struct nft_flowtable *flowtable)
398 err = nft_trans_flowtable_add(ctx, NFT_MSG_DELFLOWTABLE, flowtable);
402 nft_deactivate_next(ctx->net, flowtable);
412 static struct nft_table *nft_table_lookup(const struct net *net,
413 const struct nlattr *nla,
414 u8 family, u8 genmask)
416 struct nft_table *table;
418 list_for_each_entry(table, &net->nft.tables, list) {
419 if (!nla_strcmp(nla, table->name) &&
420 table->family == family &&
421 nft_active_genmask(table, genmask))
427 static struct nft_table *nft_table_lookup_byhandle(const struct net *net,
428 const struct nlattr *nla,
431 struct nft_table *table;
433 list_for_each_entry(table, &net->nft.tables, list) {
434 if (be64_to_cpu(nla_get_be64(nla)) == table->handle &&
435 nft_active_genmask(table, genmask))
441 static struct nft_table *nf_tables_table_lookup(const struct net *net,
442 const struct nlattr *nla,
443 u8 family, u8 genmask)
445 struct nft_table *table;
448 return ERR_PTR(-EINVAL);
450 table = nft_table_lookup(net, nla, family, genmask);
454 return ERR_PTR(-ENOENT);
457 static struct nft_table *nf_tables_table_lookup_byhandle(const struct net *net,
458 const struct nlattr *nla,
461 struct nft_table *table;
464 return ERR_PTR(-EINVAL);
466 table = nft_table_lookup_byhandle(net, nla, genmask);
470 return ERR_PTR(-ENOENT);
473 static inline u64 nf_tables_alloc_handle(struct nft_table *table)
475 return ++table->hgenerator;
478 static const struct nft_chain_type *chain_type[NFPROTO_NUMPROTO][NFT_CHAIN_T_MAX];
480 static const struct nft_chain_type *
481 __nf_tables_chain_type_lookup(const struct nlattr *nla, u8 family)
485 for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
486 if (chain_type[family][i] != NULL &&
487 !nla_strcmp(nla, chain_type[family][i]->name))
488 return chain_type[family][i];
493 static const struct nft_chain_type *
494 nf_tables_chain_type_lookup(const struct nlattr *nla, u8 family, bool autoload)
496 const struct nft_chain_type *type;
498 type = __nf_tables_chain_type_lookup(nla, family);
501 #ifdef CONFIG_MODULES
503 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
504 request_module("nft-chain-%u-%.*s", family,
505 nla_len(nla), (const char *)nla_data(nla));
506 nfnl_lock(NFNL_SUBSYS_NFTABLES);
507 type = __nf_tables_chain_type_lookup(nla, family);
509 return ERR_PTR(-EAGAIN);
512 return ERR_PTR(-ENOENT);
515 static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
516 [NFTA_TABLE_NAME] = { .type = NLA_STRING,
517 .len = NFT_TABLE_MAXNAMELEN - 1 },
518 [NFTA_TABLE_FLAGS] = { .type = NLA_U32 },
519 [NFTA_TABLE_HANDLE] = { .type = NLA_U64 },
522 static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
523 u32 portid, u32 seq, int event, u32 flags,
524 int family, const struct nft_table *table)
526 struct nlmsghdr *nlh;
527 struct nfgenmsg *nfmsg;
529 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
530 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
532 goto nla_put_failure;
534 nfmsg = nlmsg_data(nlh);
535 nfmsg->nfgen_family = family;
536 nfmsg->version = NFNETLINK_V0;
537 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
539 if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
540 nla_put_be32(skb, NFTA_TABLE_FLAGS, htonl(table->flags)) ||
541 nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)) ||
542 nla_put_be64(skb, NFTA_TABLE_HANDLE, cpu_to_be64(table->handle),
544 goto nla_put_failure;
550 nlmsg_trim(skb, nlh);
554 static void nf_tables_table_notify(const struct nft_ctx *ctx, int event)
560 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
563 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
567 err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
568 event, 0, ctx->family, ctx->table);
574 nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
575 ctx->report, GFP_KERNEL);
578 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
581 static int nf_tables_dump_tables(struct sk_buff *skb,
582 struct netlink_callback *cb)
584 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
585 const struct nft_table *table;
586 unsigned int idx = 0, s_idx = cb->args[0];
587 struct net *net = sock_net(skb->sk);
588 int family = nfmsg->nfgen_family;
591 cb->seq = net->nft.base_seq;
593 list_for_each_entry_rcu(table, &net->nft.tables, list) {
594 if (family != NFPROTO_UNSPEC && family != table->family)
600 memset(&cb->args[1], 0,
601 sizeof(cb->args) - sizeof(cb->args[0]));
602 if (!nft_is_active(net, table))
604 if (nf_tables_fill_table_info(skb, net,
605 NETLINK_CB(cb->skb).portid,
607 NFT_MSG_NEWTABLE, NLM_F_MULTI,
608 table->family, table) < 0)
611 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
621 static int nf_tables_gettable(struct net *net, struct sock *nlsk,
622 struct sk_buff *skb, const struct nlmsghdr *nlh,
623 const struct nlattr * const nla[],
624 struct netlink_ext_ack *extack)
626 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
627 u8 genmask = nft_genmask_cur(net);
628 const struct nft_table *table;
629 struct sk_buff *skb2;
630 int family = nfmsg->nfgen_family;
633 if (nlh->nlmsg_flags & NLM_F_DUMP) {
634 struct netlink_dump_control c = {
635 .dump = nf_tables_dump_tables,
637 return netlink_dump_start(nlsk, skb, nlh, &c);
640 table = nf_tables_table_lookup(net, nla[NFTA_TABLE_NAME], family,
643 return PTR_ERR(table);
645 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
649 err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
650 nlh->nlmsg_seq, NFT_MSG_NEWTABLE, 0,
655 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
662 static void nft_table_disable(struct net *net, struct nft_table *table, u32 cnt)
664 struct nft_chain *chain;
667 list_for_each_entry(chain, &table->chains, list) {
668 if (!nft_is_active_next(net, chain))
670 if (!nft_is_base_chain(chain))
673 if (cnt && i++ == cnt)
676 nf_unregister_net_hook(net, &nft_base_chain(chain)->ops);
680 static int nf_tables_table_enable(struct net *net, struct nft_table *table)
682 struct nft_chain *chain;
685 list_for_each_entry(chain, &table->chains, list) {
686 if (!nft_is_active_next(net, chain))
688 if (!nft_is_base_chain(chain))
691 err = nf_register_net_hook(net, &nft_base_chain(chain)->ops);
700 nft_table_disable(net, table, i);
704 static void nf_tables_table_disable(struct net *net, struct nft_table *table)
706 nft_table_disable(net, table, 0);
709 static int nf_tables_updtable(struct nft_ctx *ctx)
711 struct nft_trans *trans;
715 if (!ctx->nla[NFTA_TABLE_FLAGS])
718 flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
719 if (flags & ~NFT_TABLE_F_DORMANT)
722 if (flags == ctx->table->flags)
725 trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
726 sizeof(struct nft_trans_table));
730 if ((flags & NFT_TABLE_F_DORMANT) &&
731 !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
732 nft_trans_table_enable(trans) = false;
733 } else if (!(flags & NFT_TABLE_F_DORMANT) &&
734 ctx->table->flags & NFT_TABLE_F_DORMANT) {
735 ret = nf_tables_table_enable(ctx->net, ctx->table);
737 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
738 nft_trans_table_enable(trans) = true;
744 nft_trans_table_update(trans) = true;
745 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
748 nft_trans_destroy(trans);
752 static int nf_tables_newtable(struct net *net, struct sock *nlsk,
753 struct sk_buff *skb, const struct nlmsghdr *nlh,
754 const struct nlattr * const nla[],
755 struct netlink_ext_ack *extack)
757 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
758 u8 genmask = nft_genmask_next(net);
759 const struct nlattr *name;
760 struct nft_table *table;
761 int family = nfmsg->nfgen_family;
766 name = nla[NFTA_TABLE_NAME];
767 table = nf_tables_table_lookup(net, name, family, genmask);
769 if (PTR_ERR(table) != -ENOENT)
770 return PTR_ERR(table);
772 if (nlh->nlmsg_flags & NLM_F_EXCL)
774 if (nlh->nlmsg_flags & NLM_F_REPLACE)
777 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
778 return nf_tables_updtable(&ctx);
781 if (nla[NFTA_TABLE_FLAGS]) {
782 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
783 if (flags & ~NFT_TABLE_F_DORMANT)
788 table = kzalloc(sizeof(*table), GFP_KERNEL);
792 table->name = nla_strdup(name, GFP_KERNEL);
793 if (table->name == NULL)
796 INIT_LIST_HEAD(&table->chains);
797 INIT_LIST_HEAD(&table->sets);
798 INIT_LIST_HEAD(&table->objects);
799 INIT_LIST_HEAD(&table->flowtables);
800 table->family = family;
801 table->flags = flags;
802 table->handle = ++table_handle;
804 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
805 err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
809 list_add_tail_rcu(&table->list, &net->nft.tables);
819 static int nft_flush_table(struct nft_ctx *ctx)
821 struct nft_flowtable *flowtable, *nft;
822 struct nft_chain *chain, *nc;
823 struct nft_object *obj, *ne;
824 struct nft_set *set, *ns;
827 list_for_each_entry(chain, &ctx->table->chains, list) {
828 if (!nft_is_active_next(ctx->net, chain))
833 err = nft_delrule_by_chain(ctx);
838 list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
839 if (!nft_is_active_next(ctx->net, set))
842 if (nft_set_is_anonymous(set) &&
843 !list_empty(&set->bindings))
846 err = nft_delset(ctx, set);
851 list_for_each_entry_safe(flowtable, nft, &ctx->table->flowtables, list) {
852 err = nft_delflowtable(ctx, flowtable);
857 list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) {
858 err = nft_delobj(ctx, obj);
863 list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
864 if (!nft_is_active_next(ctx->net, chain))
869 err = nft_delchain(ctx);
874 err = nft_deltable(ctx);
879 static int nft_flush(struct nft_ctx *ctx, int family)
881 struct nft_table *table, *nt;
882 const struct nlattr * const *nla = ctx->nla;
885 list_for_each_entry_safe(table, nt, &ctx->net->nft.tables, list) {
886 if (family != AF_UNSPEC && table->family != family)
889 ctx->family = table->family;
891 if (!nft_is_active_next(ctx->net, table))
894 if (nla[NFTA_TABLE_NAME] &&
895 nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
900 err = nft_flush_table(ctx);
908 static int nf_tables_deltable(struct net *net, struct sock *nlsk,
909 struct sk_buff *skb, const struct nlmsghdr *nlh,
910 const struct nlattr * const nla[],
911 struct netlink_ext_ack *extack)
913 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
914 u8 genmask = nft_genmask_next(net);
915 struct nft_table *table;
916 int family = nfmsg->nfgen_family;
919 nft_ctx_init(&ctx, net, skb, nlh, 0, NULL, NULL, nla);
920 if (family == AF_UNSPEC ||
921 (!nla[NFTA_TABLE_NAME] && !nla[NFTA_TABLE_HANDLE]))
922 return nft_flush(&ctx, family);
924 if (nla[NFTA_TABLE_HANDLE])
925 table = nf_tables_table_lookup_byhandle(net,
926 nla[NFTA_TABLE_HANDLE],
929 table = nf_tables_table_lookup(net, nla[NFTA_TABLE_NAME],
933 return PTR_ERR(table);
935 if (nlh->nlmsg_flags & NLM_F_NONREC &&
942 return nft_flush_table(&ctx);
945 static void nf_tables_table_destroy(struct nft_ctx *ctx)
947 BUG_ON(ctx->table->use > 0);
949 kfree(ctx->table->name);
953 void nft_register_chain_type(const struct nft_chain_type *ctype)
955 if (WARN_ON(ctype->family >= NFPROTO_NUMPROTO))
958 nfnl_lock(NFNL_SUBSYS_NFTABLES);
959 if (WARN_ON(chain_type[ctype->family][ctype->type] != NULL)) {
960 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
963 chain_type[ctype->family][ctype->type] = ctype;
964 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
966 EXPORT_SYMBOL_GPL(nft_register_chain_type);
968 void nft_unregister_chain_type(const struct nft_chain_type *ctype)
970 nfnl_lock(NFNL_SUBSYS_NFTABLES);
971 chain_type[ctype->family][ctype->type] = NULL;
972 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
974 EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
980 static struct nft_chain *
981 nf_tables_chain_lookup_byhandle(const struct nft_table *table, u64 handle,
984 struct nft_chain *chain;
986 list_for_each_entry(chain, &table->chains, list) {
987 if (chain->handle == handle &&
988 nft_active_genmask(chain, genmask))
992 return ERR_PTR(-ENOENT);
995 static struct nft_chain *nf_tables_chain_lookup(const struct nft_table *table,
996 const struct nlattr *nla,
999 struct nft_chain *chain;
1002 return ERR_PTR(-EINVAL);
1004 list_for_each_entry(chain, &table->chains, list) {
1005 if (!nla_strcmp(nla, chain->name) &&
1006 nft_active_genmask(chain, genmask))
1010 return ERR_PTR(-ENOENT);
1013 static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
1014 [NFTA_CHAIN_TABLE] = { .type = NLA_STRING,
1015 .len = NFT_TABLE_MAXNAMELEN - 1 },
1016 [NFTA_CHAIN_HANDLE] = { .type = NLA_U64 },
1017 [NFTA_CHAIN_NAME] = { .type = NLA_STRING,
1018 .len = NFT_CHAIN_MAXNAMELEN - 1 },
1019 [NFTA_CHAIN_HOOK] = { .type = NLA_NESTED },
1020 [NFTA_CHAIN_POLICY] = { .type = NLA_U32 },
1021 [NFTA_CHAIN_TYPE] = { .type = NLA_STRING },
1022 [NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED },
1025 static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
1026 [NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 },
1027 [NFTA_HOOK_PRIORITY] = { .type = NLA_U32 },
1028 [NFTA_HOOK_DEV] = { .type = NLA_STRING,
1029 .len = IFNAMSIZ - 1 },
1032 static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
1034 struct nft_stats *cpu_stats, total;
1035 struct nlattr *nest;
1040 memset(&total, 0, sizeof(total));
1041 for_each_possible_cpu(cpu) {
1042 cpu_stats = per_cpu_ptr(stats, cpu);
1044 seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
1045 pkts = cpu_stats->pkts;
1046 bytes = cpu_stats->bytes;
1047 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq));
1049 total.bytes += bytes;
1051 nest = nla_nest_start(skb, NFTA_CHAIN_COUNTERS);
1053 goto nla_put_failure;
1055 if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts),
1056 NFTA_COUNTER_PAD) ||
1057 nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
1059 goto nla_put_failure;
1061 nla_nest_end(skb, nest);
1068 static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
1069 u32 portid, u32 seq, int event, u32 flags,
1070 int family, const struct nft_table *table,
1071 const struct nft_chain *chain)
1073 struct nlmsghdr *nlh;
1074 struct nfgenmsg *nfmsg;
1076 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
1077 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
1079 goto nla_put_failure;
1081 nfmsg = nlmsg_data(nlh);
1082 nfmsg->nfgen_family = family;
1083 nfmsg->version = NFNETLINK_V0;
1084 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
1086 if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name))
1087 goto nla_put_failure;
1088 if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle),
1090 goto nla_put_failure;
1091 if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name))
1092 goto nla_put_failure;
1094 if (nft_is_base_chain(chain)) {
1095 const struct nft_base_chain *basechain = nft_base_chain(chain);
1096 const struct nf_hook_ops *ops = &basechain->ops;
1097 struct nlattr *nest;
1099 nest = nla_nest_start(skb, NFTA_CHAIN_HOOK);
1101 goto nla_put_failure;
1102 if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
1103 goto nla_put_failure;
1104 if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
1105 goto nla_put_failure;
1106 if (basechain->dev_name[0] &&
1107 nla_put_string(skb, NFTA_HOOK_DEV, basechain->dev_name))
1108 goto nla_put_failure;
1109 nla_nest_end(skb, nest);
1111 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
1112 htonl(basechain->policy)))
1113 goto nla_put_failure;
1115 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
1116 goto nla_put_failure;
1118 if (basechain->stats && nft_dump_stats(skb, basechain->stats))
1119 goto nla_put_failure;
1122 if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
1123 goto nla_put_failure;
1125 nlmsg_end(skb, nlh);
1129 nlmsg_trim(skb, nlh);
1133 static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event)
1135 struct sk_buff *skb;
1139 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1142 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1146 err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
1147 event, 0, ctx->family, ctx->table,
1154 nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1155 ctx->report, GFP_KERNEL);
1158 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
1161 static int nf_tables_dump_chains(struct sk_buff *skb,
1162 struct netlink_callback *cb)
1164 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1165 const struct nft_table *table;
1166 const struct nft_chain *chain;
1167 unsigned int idx = 0, s_idx = cb->args[0];
1168 struct net *net = sock_net(skb->sk);
1169 int family = nfmsg->nfgen_family;
1172 cb->seq = net->nft.base_seq;
1174 list_for_each_entry_rcu(table, &net->nft.tables, list) {
1175 if (family != NFPROTO_UNSPEC && family != table->family)
1178 list_for_each_entry_rcu(chain, &table->chains, list) {
1182 memset(&cb->args[1], 0,
1183 sizeof(cb->args) - sizeof(cb->args[0]));
1184 if (!nft_is_active(net, chain))
1186 if (nf_tables_fill_chain_info(skb, net,
1187 NETLINK_CB(cb->skb).portid,
1191 table->family, table,
1195 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1206 static int nf_tables_getchain(struct net *net, struct sock *nlsk,
1207 struct sk_buff *skb, const struct nlmsghdr *nlh,
1208 const struct nlattr * const nla[],
1209 struct netlink_ext_ack *extack)
1211 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1212 u8 genmask = nft_genmask_cur(net);
1213 const struct nft_table *table;
1214 const struct nft_chain *chain;
1215 struct sk_buff *skb2;
1216 int family = nfmsg->nfgen_family;
1219 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1220 struct netlink_dump_control c = {
1221 .dump = nf_tables_dump_chains,
1223 return netlink_dump_start(nlsk, skb, nlh, &c);
1226 table = nf_tables_table_lookup(net, nla[NFTA_CHAIN_TABLE], family,
1229 return PTR_ERR(table);
1231 chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME], genmask);
1233 return PTR_ERR(chain);
1235 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1239 err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
1240 nlh->nlmsg_seq, NFT_MSG_NEWCHAIN, 0,
1241 family, table, chain);
1245 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
1252 static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
1253 [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 },
1254 [NFTA_COUNTER_BYTES] = { .type = NLA_U64 },
1257 static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
1259 struct nlattr *tb[NFTA_COUNTER_MAX+1];
1260 struct nft_stats __percpu *newstats;
1261 struct nft_stats *stats;
1264 err = nla_parse_nested(tb, NFTA_COUNTER_MAX, attr, nft_counter_policy,
1267 return ERR_PTR(err);
1269 if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
1270 return ERR_PTR(-EINVAL);
1272 newstats = netdev_alloc_pcpu_stats(struct nft_stats);
1273 if (newstats == NULL)
1274 return ERR_PTR(-ENOMEM);
1276 /* Restore old counters on this cpu, no problem. Per-cpu statistics
1277 * are not exposed to userspace.
1280 stats = this_cpu_ptr(newstats);
1281 stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
1282 stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
1288 static void nft_chain_stats_replace(struct nft_base_chain *chain,
1289 struct nft_stats __percpu *newstats)
1291 struct nft_stats __percpu *oldstats;
1293 if (newstats == NULL)
1297 oldstats = nfnl_dereference(chain->stats, NFNL_SUBSYS_NFTABLES);
1298 rcu_assign_pointer(chain->stats, newstats);
1300 free_percpu(oldstats);
1302 rcu_assign_pointer(chain->stats, newstats);
1303 static_branch_inc(&nft_counters_enabled);
1307 static void nf_tables_chain_destroy(struct nft_ctx *ctx)
1309 struct nft_chain *chain = ctx->chain;
1311 BUG_ON(chain->use > 0);
1313 if (nft_is_base_chain(chain)) {
1314 struct nft_base_chain *basechain = nft_base_chain(chain);
1316 if (basechain->type->free)
1317 basechain->type->free(ctx);
1318 module_put(basechain->type->owner);
1319 free_percpu(basechain->stats);
1320 if (basechain->stats)
1321 static_branch_dec(&nft_counters_enabled);
1330 struct nft_chain_hook {
1333 const struct nft_chain_type *type;
1334 struct net_device *dev;
1337 static int nft_chain_parse_hook(struct net *net,
1338 const struct nlattr * const nla[],
1339 struct nft_chain_hook *hook, u8 family,
1342 struct nlattr *ha[NFTA_HOOK_MAX + 1];
1343 const struct nft_chain_type *type;
1344 struct net_device *dev;
1347 err = nla_parse_nested(ha, NFTA_HOOK_MAX, nla[NFTA_CHAIN_HOOK],
1348 nft_hook_policy, NULL);
1352 if (ha[NFTA_HOOK_HOOKNUM] == NULL ||
1353 ha[NFTA_HOOK_PRIORITY] == NULL)
1356 hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
1357 hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
1359 type = chain_type[family][NFT_CHAIN_T_DEFAULT];
1360 if (nla[NFTA_CHAIN_TYPE]) {
1361 type = nf_tables_chain_type_lookup(nla[NFTA_CHAIN_TYPE],
1364 return PTR_ERR(type);
1366 if (!(type->hook_mask & (1 << hook->num)))
1369 if (type->type == NFT_CHAIN_T_NAT &&
1370 hook->priority <= NF_IP_PRI_CONNTRACK)
1373 if (!try_module_get(type->owner))
1379 if (family == NFPROTO_NETDEV) {
1380 char ifname[IFNAMSIZ];
1382 if (!ha[NFTA_HOOK_DEV]) {
1383 module_put(type->owner);
1387 nla_strlcpy(ifname, ha[NFTA_HOOK_DEV], IFNAMSIZ);
1388 dev = __dev_get_by_name(net, ifname);
1390 module_put(type->owner);
1394 } else if (ha[NFTA_HOOK_DEV]) {
1395 module_put(type->owner);
1402 static void nft_chain_release_hook(struct nft_chain_hook *hook)
1404 module_put(hook->type->owner);
1407 static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask,
1408 u8 policy, bool create)
1410 const struct nlattr * const *nla = ctx->nla;
1411 struct nft_table *table = ctx->table;
1412 struct nft_base_chain *basechain;
1413 struct nft_stats __percpu *stats;
1414 struct net *net = ctx->net;
1415 struct nft_chain *chain;
1418 if (table->use == UINT_MAX)
1421 if (nla[NFTA_CHAIN_HOOK]) {
1422 struct nft_chain_hook hook;
1423 struct nf_hook_ops *ops;
1425 err = nft_chain_parse_hook(net, nla, &hook, family, create);
1429 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL);
1430 if (basechain == NULL) {
1431 nft_chain_release_hook(&hook);
1435 if (hook.dev != NULL)
1436 strncpy(basechain->dev_name, hook.dev->name, IFNAMSIZ);
1438 if (nla[NFTA_CHAIN_COUNTERS]) {
1439 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1440 if (IS_ERR(stats)) {
1441 nft_chain_release_hook(&hook);
1443 return PTR_ERR(stats);
1445 basechain->stats = stats;
1446 static_branch_inc(&nft_counters_enabled);
1449 basechain->type = hook.type;
1450 if (basechain->type->init)
1451 basechain->type->init(ctx);
1453 chain = &basechain->chain;
1455 ops = &basechain->ops;
1457 ops->hooknum = hook.num;
1458 ops->priority = hook.priority;
1460 ops->hook = hook.type->hooks[ops->hooknum];
1461 ops->dev = hook.dev;
1463 if (basechain->type->type == NFT_CHAIN_T_NAT)
1464 ops->nat_hook = true;
1466 chain->flags |= NFT_BASE_CHAIN;
1467 basechain->policy = policy;
1469 chain = kzalloc(sizeof(*chain), GFP_KERNEL);
1475 INIT_LIST_HEAD(&chain->rules);
1476 chain->handle = nf_tables_alloc_handle(table);
1477 chain->table = table;
1478 chain->name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL);
1484 err = nf_tables_register_hook(net, table, chain);
1488 err = nft_trans_chain_add(ctx, NFT_MSG_NEWCHAIN);
1493 list_add_tail_rcu(&chain->list, &table->chains);
1497 nf_tables_unregister_hook(net, table, chain);
1499 nf_tables_chain_destroy(ctx);
1504 static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
1507 const struct nlattr * const *nla = ctx->nla;
1508 struct nft_table *table = ctx->table;
1509 struct nft_chain *chain = ctx->chain;
1510 struct nft_base_chain *basechain;
1511 struct nft_stats *stats = NULL;
1512 struct nft_chain_hook hook;
1513 const struct nlattr *name;
1514 struct nf_hook_ops *ops;
1515 struct nft_trans *trans;
1518 if (nla[NFTA_CHAIN_HOOK]) {
1519 if (!nft_is_base_chain(chain))
1522 err = nft_chain_parse_hook(ctx->net, nla, &hook, ctx->family,
1527 basechain = nft_base_chain(chain);
1528 if (basechain->type != hook.type) {
1529 nft_chain_release_hook(&hook);
1533 ops = &basechain->ops;
1534 if (ops->hooknum != hook.num ||
1535 ops->priority != hook.priority ||
1536 ops->dev != hook.dev) {
1537 nft_chain_release_hook(&hook);
1540 nft_chain_release_hook(&hook);
1543 if (nla[NFTA_CHAIN_HANDLE] &&
1544 nla[NFTA_CHAIN_NAME]) {
1545 struct nft_chain *chain2;
1547 chain2 = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME],
1549 if (!IS_ERR(chain2))
1553 if (nla[NFTA_CHAIN_COUNTERS]) {
1554 if (!nft_is_base_chain(chain))
1557 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1559 return PTR_ERR(stats);
1562 trans = nft_trans_alloc(ctx, NFT_MSG_NEWCHAIN,
1563 sizeof(struct nft_trans_chain));
1564 if (trans == NULL) {
1569 nft_trans_chain_stats(trans) = stats;
1570 nft_trans_chain_update(trans) = true;
1572 if (nla[NFTA_CHAIN_POLICY])
1573 nft_trans_chain_policy(trans) = policy;
1575 nft_trans_chain_policy(trans) = -1;
1577 name = nla[NFTA_CHAIN_NAME];
1578 if (nla[NFTA_CHAIN_HANDLE] && name) {
1579 nft_trans_chain_name(trans) =
1580 nla_strdup(name, GFP_KERNEL);
1581 if (!nft_trans_chain_name(trans)) {
1587 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
1592 static int nf_tables_newchain(struct net *net, struct sock *nlsk,
1593 struct sk_buff *skb, const struct nlmsghdr *nlh,
1594 const struct nlattr * const nla[],
1595 struct netlink_ext_ack *extack)
1597 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1598 const struct nlattr * uninitialized_var(name);
1599 u8 genmask = nft_genmask_next(net);
1600 int family = nfmsg->nfgen_family;
1601 struct nft_table *table;
1602 struct nft_chain *chain;
1603 u8 policy = NF_ACCEPT;
1608 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
1610 table = nf_tables_table_lookup(net, nla[NFTA_CHAIN_TABLE], family,
1613 return PTR_ERR(table);
1616 name = nla[NFTA_CHAIN_NAME];
1618 if (nla[NFTA_CHAIN_HANDLE]) {
1619 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
1620 chain = nf_tables_chain_lookup_byhandle(table, handle, genmask);
1622 return PTR_ERR(chain);
1624 chain = nf_tables_chain_lookup(table, name, genmask);
1625 if (IS_ERR(chain)) {
1626 if (PTR_ERR(chain) != -ENOENT)
1627 return PTR_ERR(chain);
1632 if (nla[NFTA_CHAIN_POLICY]) {
1633 if (chain != NULL &&
1634 !nft_is_base_chain(chain))
1637 if (chain == NULL &&
1638 nla[NFTA_CHAIN_HOOK] == NULL)
1641 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
1651 nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
1653 if (chain != NULL) {
1654 if (nlh->nlmsg_flags & NLM_F_EXCL)
1656 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1659 return nf_tables_updchain(&ctx, genmask, policy, create);
1662 return nf_tables_addchain(&ctx, family, genmask, policy, create);
1665 static int nf_tables_delchain(struct net *net, struct sock *nlsk,
1666 struct sk_buff *skb, const struct nlmsghdr *nlh,
1667 const struct nlattr * const nla[],
1668 struct netlink_ext_ack *extack)
1670 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1671 u8 genmask = nft_genmask_next(net);
1672 struct nft_table *table;
1673 struct nft_chain *chain;
1674 struct nft_rule *rule;
1675 int family = nfmsg->nfgen_family;
1681 table = nf_tables_table_lookup(net, nla[NFTA_CHAIN_TABLE], family,
1684 return PTR_ERR(table);
1686 if (nla[NFTA_CHAIN_HANDLE]) {
1687 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
1688 chain = nf_tables_chain_lookup_byhandle(table, handle, genmask);
1690 chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME], genmask);
1693 return PTR_ERR(chain);
1695 if (nlh->nlmsg_flags & NLM_F_NONREC &&
1699 nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
1702 list_for_each_entry(rule, &chain->rules, list) {
1703 if (!nft_is_active_next(net, rule))
1707 err = nft_delrule(&ctx, rule);
1712 /* There are rules and elements that are still holding references to us,
1713 * we cannot do a recursive removal in this case.
1718 return nft_delchain(&ctx);
1726 * nft_register_expr - register nf_tables expr type
1729 * Registers the expr type for use with nf_tables. Returns zero on
1730 * success or a negative errno code otherwise.
1732 int nft_register_expr(struct nft_expr_type *type)
1734 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1735 if (type->family == NFPROTO_UNSPEC)
1736 list_add_tail_rcu(&type->list, &nf_tables_expressions);
1738 list_add_rcu(&type->list, &nf_tables_expressions);
1739 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1742 EXPORT_SYMBOL_GPL(nft_register_expr);
1745 * nft_unregister_expr - unregister nf_tables expr type
1748 * Unregisters the expr typefor use with nf_tables.
1750 void nft_unregister_expr(struct nft_expr_type *type)
1752 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1753 list_del_rcu(&type->list);
1754 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1756 EXPORT_SYMBOL_GPL(nft_unregister_expr);
1758 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
1761 const struct nft_expr_type *type;
1763 list_for_each_entry(type, &nf_tables_expressions, list) {
1764 if (!nla_strcmp(nla, type->name) &&
1765 (!type->family || type->family == family))
1771 static const struct nft_expr_type *nft_expr_type_get(u8 family,
1774 const struct nft_expr_type *type;
1777 return ERR_PTR(-EINVAL);
1779 type = __nft_expr_type_get(family, nla);
1780 if (type != NULL && try_module_get(type->owner))
1783 #ifdef CONFIG_MODULES
1785 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1786 request_module("nft-expr-%u-%.*s", family,
1787 nla_len(nla), (char *)nla_data(nla));
1788 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1789 if (__nft_expr_type_get(family, nla))
1790 return ERR_PTR(-EAGAIN);
1792 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1793 request_module("nft-expr-%.*s",
1794 nla_len(nla), (char *)nla_data(nla));
1795 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1796 if (__nft_expr_type_get(family, nla))
1797 return ERR_PTR(-EAGAIN);
1800 return ERR_PTR(-ENOENT);
1803 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
1804 [NFTA_EXPR_NAME] = { .type = NLA_STRING },
1805 [NFTA_EXPR_DATA] = { .type = NLA_NESTED },
1808 static int nf_tables_fill_expr_info(struct sk_buff *skb,
1809 const struct nft_expr *expr)
1811 if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
1812 goto nla_put_failure;
1814 if (expr->ops->dump) {
1815 struct nlattr *data = nla_nest_start(skb, NFTA_EXPR_DATA);
1817 goto nla_put_failure;
1818 if (expr->ops->dump(skb, expr) < 0)
1819 goto nla_put_failure;
1820 nla_nest_end(skb, data);
1829 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
1830 const struct nft_expr *expr)
1832 struct nlattr *nest;
1834 nest = nla_nest_start(skb, attr);
1836 goto nla_put_failure;
1837 if (nf_tables_fill_expr_info(skb, expr) < 0)
1838 goto nla_put_failure;
1839 nla_nest_end(skb, nest);
1846 struct nft_expr_info {
1847 const struct nft_expr_ops *ops;
1848 struct nlattr *tb[NFT_EXPR_MAXATTR + 1];
1851 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
1852 const struct nlattr *nla,
1853 struct nft_expr_info *info)
1855 const struct nft_expr_type *type;
1856 const struct nft_expr_ops *ops;
1857 struct nlattr *tb[NFTA_EXPR_MAX + 1];
1860 err = nla_parse_nested(tb, NFTA_EXPR_MAX, nla, nft_expr_policy, NULL);
1864 type = nft_expr_type_get(ctx->family, tb[NFTA_EXPR_NAME]);
1866 return PTR_ERR(type);
1868 if (tb[NFTA_EXPR_DATA]) {
1869 err = nla_parse_nested(info->tb, type->maxattr,
1870 tb[NFTA_EXPR_DATA], type->policy, NULL);
1874 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
1876 if (type->select_ops != NULL) {
1877 ops = type->select_ops(ctx,
1878 (const struct nlattr * const *)info->tb);
1890 module_put(type->owner);
1894 static int nf_tables_newexpr(const struct nft_ctx *ctx,
1895 const struct nft_expr_info *info,
1896 struct nft_expr *expr)
1898 const struct nft_expr_ops *ops = info->ops;
1903 err = ops->init(ctx, expr, (const struct nlattr **)info->tb);
1908 if (ops->validate) {
1909 const struct nft_data *data = NULL;
1911 err = ops->validate(ctx, expr, &data);
1920 ops->destroy(ctx, expr);
1926 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
1927 struct nft_expr *expr)
1929 if (expr->ops->destroy)
1930 expr->ops->destroy(ctx, expr);
1931 module_put(expr->ops->type->owner);
1934 struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
1935 const struct nlattr *nla)
1937 struct nft_expr_info info;
1938 struct nft_expr *expr;
1941 err = nf_tables_expr_parse(ctx, nla, &info);
1946 expr = kzalloc(info.ops->size, GFP_KERNEL);
1950 err = nf_tables_newexpr(ctx, &info, expr);
1958 module_put(info.ops->type->owner);
1960 return ERR_PTR(err);
1963 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
1965 nf_tables_expr_destroy(ctx, expr);
1973 static struct nft_rule *__nf_tables_rule_lookup(const struct nft_chain *chain,
1976 struct nft_rule *rule;
1978 // FIXME: this sucks
1979 list_for_each_entry(rule, &chain->rules, list) {
1980 if (handle == rule->handle)
1984 return ERR_PTR(-ENOENT);
1987 static struct nft_rule *nf_tables_rule_lookup(const struct nft_chain *chain,
1988 const struct nlattr *nla)
1991 return ERR_PTR(-EINVAL);
1993 return __nf_tables_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
1996 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
1997 [NFTA_RULE_TABLE] = { .type = NLA_STRING,
1998 .len = NFT_TABLE_MAXNAMELEN - 1 },
1999 [NFTA_RULE_CHAIN] = { .type = NLA_STRING,
2000 .len = NFT_CHAIN_MAXNAMELEN - 1 },
2001 [NFTA_RULE_HANDLE] = { .type = NLA_U64 },
2002 [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
2003 [NFTA_RULE_COMPAT] = { .type = NLA_NESTED },
2004 [NFTA_RULE_POSITION] = { .type = NLA_U64 },
2005 [NFTA_RULE_USERDATA] = { .type = NLA_BINARY,
2006 .len = NFT_USERDATA_MAXLEN },
2007 [NFTA_RULE_ID] = { .type = NLA_U32 },
2010 static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
2011 u32 portid, u32 seq, int event,
2012 u32 flags, int family,
2013 const struct nft_table *table,
2014 const struct nft_chain *chain,
2015 const struct nft_rule *rule)
2017 struct nlmsghdr *nlh;
2018 struct nfgenmsg *nfmsg;
2019 const struct nft_expr *expr, *next;
2020 struct nlattr *list;
2021 const struct nft_rule *prule;
2022 u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
2024 nlh = nlmsg_put(skb, portid, seq, type, sizeof(struct nfgenmsg), flags);
2026 goto nla_put_failure;
2028 nfmsg = nlmsg_data(nlh);
2029 nfmsg->nfgen_family = family;
2030 nfmsg->version = NFNETLINK_V0;
2031 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
2033 if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
2034 goto nla_put_failure;
2035 if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
2036 goto nla_put_failure;
2037 if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
2039 goto nla_put_failure;
2041 if ((event != NFT_MSG_DELRULE) && (rule->list.prev != &chain->rules)) {
2042 prule = list_prev_entry(rule, list);
2043 if (nla_put_be64(skb, NFTA_RULE_POSITION,
2044 cpu_to_be64(prule->handle),
2046 goto nla_put_failure;
2049 list = nla_nest_start(skb, NFTA_RULE_EXPRESSIONS);
2051 goto nla_put_failure;
2052 nft_rule_for_each_expr(expr, next, rule) {
2053 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
2054 goto nla_put_failure;
2056 nla_nest_end(skb, list);
2059 struct nft_userdata *udata = nft_userdata(rule);
2060 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
2062 goto nla_put_failure;
2065 nlmsg_end(skb, nlh);
2069 nlmsg_trim(skb, nlh);
2073 static void nf_tables_rule_notify(const struct nft_ctx *ctx,
2074 const struct nft_rule *rule, int event)
2076 struct sk_buff *skb;
2080 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
2083 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
2087 err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
2088 event, 0, ctx->family, ctx->table,
2095 nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
2096 ctx->report, GFP_KERNEL);
2099 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
2102 struct nft_rule_dump_ctx {
2107 static int nf_tables_dump_rules(struct sk_buff *skb,
2108 struct netlink_callback *cb)
2110 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
2111 const struct nft_rule_dump_ctx *ctx = cb->data;
2112 const struct nft_table *table;
2113 const struct nft_chain *chain;
2114 const struct nft_rule *rule;
2115 unsigned int idx = 0, s_idx = cb->args[0];
2116 struct net *net = sock_net(skb->sk);
2117 int family = nfmsg->nfgen_family;
2120 cb->seq = net->nft.base_seq;
2122 list_for_each_entry_rcu(table, &net->nft.tables, list) {
2123 if (family != NFPROTO_UNSPEC && family != table->family)
2126 if (ctx && ctx->table && strcmp(ctx->table, table->name) != 0)
2129 list_for_each_entry_rcu(chain, &table->chains, list) {
2130 if (ctx && ctx->chain &&
2131 strcmp(ctx->chain, chain->name) != 0)
2134 list_for_each_entry_rcu(rule, &chain->rules, list) {
2135 if (!nft_is_active(net, rule))
2140 memset(&cb->args[1], 0,
2141 sizeof(cb->args) - sizeof(cb->args[0]));
2142 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
2145 NLM_F_MULTI | NLM_F_APPEND,
2147 table, chain, rule) < 0)
2150 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
2163 static int nf_tables_dump_rules_done(struct netlink_callback *cb)
2165 struct nft_rule_dump_ctx *ctx = cb->data;
2175 static int nf_tables_getrule(struct net *net, struct sock *nlsk,
2176 struct sk_buff *skb, const struct nlmsghdr *nlh,
2177 const struct nlattr * const nla[],
2178 struct netlink_ext_ack *extack)
2180 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2181 u8 genmask = nft_genmask_cur(net);
2182 const struct nft_table *table;
2183 const struct nft_chain *chain;
2184 const struct nft_rule *rule;
2185 struct sk_buff *skb2;
2186 int family = nfmsg->nfgen_family;
2189 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2190 struct netlink_dump_control c = {
2191 .dump = nf_tables_dump_rules,
2192 .done = nf_tables_dump_rules_done,
2195 if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) {
2196 struct nft_rule_dump_ctx *ctx;
2198 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
2202 if (nla[NFTA_RULE_TABLE]) {
2203 ctx->table = nla_strdup(nla[NFTA_RULE_TABLE],
2210 if (nla[NFTA_RULE_CHAIN]) {
2211 ctx->chain = nla_strdup(nla[NFTA_RULE_CHAIN],
2222 return netlink_dump_start(nlsk, skb, nlh, &c);
2225 table = nf_tables_table_lookup(net, nla[NFTA_RULE_TABLE], family,
2228 return PTR_ERR(table);
2230 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN], genmask);
2232 return PTR_ERR(chain);
2234 rule = nf_tables_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
2236 return PTR_ERR(rule);
2238 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2242 err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
2243 nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
2244 family, table, chain, rule);
2248 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
2255 static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
2256 struct nft_rule *rule)
2258 struct nft_expr *expr;
2261 * Careful: some expressions might not be initialized in case this
2262 * is called on error from nf_tables_newrule().
2264 expr = nft_expr_first(rule);
2265 while (expr != nft_expr_last(rule) && expr->ops) {
2266 nf_tables_expr_destroy(ctx, expr);
2267 expr = nft_expr_next(expr);
2272 static void nf_tables_rule_release(const struct nft_ctx *ctx,
2273 struct nft_rule *rule)
2275 nft_rule_expr_deactivate(ctx, rule);
2276 nf_tables_rule_destroy(ctx, rule);
2279 #define NFT_RULE_MAXEXPRS 128
2281 static struct nft_expr_info *info;
2283 static int nf_tables_newrule(struct net *net, struct sock *nlsk,
2284 struct sk_buff *skb, const struct nlmsghdr *nlh,
2285 const struct nlattr * const nla[],
2286 struct netlink_ext_ack *extack)
2288 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2289 u8 genmask = nft_genmask_next(net);
2290 int family = nfmsg->nfgen_family;
2291 struct nft_table *table;
2292 struct nft_chain *chain;
2293 struct nft_rule *rule, *old_rule = NULL;
2294 struct nft_userdata *udata;
2295 struct nft_trans *trans = NULL;
2296 struct nft_expr *expr;
2299 unsigned int size, i, n, ulen = 0, usize = 0;
2302 u64 handle, pos_handle;
2304 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
2306 table = nf_tables_table_lookup(net, nla[NFTA_RULE_TABLE], family,
2309 return PTR_ERR(table);
2311 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN], genmask);
2313 return PTR_ERR(chain);
2315 if (nla[NFTA_RULE_HANDLE]) {
2316 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
2317 rule = __nf_tables_rule_lookup(chain, handle);
2319 return PTR_ERR(rule);
2321 if (nlh->nlmsg_flags & NLM_F_EXCL)
2323 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2328 if (!create || nlh->nlmsg_flags & NLM_F_REPLACE)
2330 handle = nf_tables_alloc_handle(table);
2332 if (chain->use == UINT_MAX)
2336 if (nla[NFTA_RULE_POSITION]) {
2337 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
2340 pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
2341 old_rule = __nf_tables_rule_lookup(chain, pos_handle);
2342 if (IS_ERR(old_rule))
2343 return PTR_ERR(old_rule);
2346 nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
2350 if (nla[NFTA_RULE_EXPRESSIONS]) {
2351 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
2353 if (nla_type(tmp) != NFTA_LIST_ELEM)
2355 if (n == NFT_RULE_MAXEXPRS)
2357 err = nf_tables_expr_parse(&ctx, tmp, &info[n]);
2360 size += info[n].ops->size;
2364 /* Check for overflow of dlen field */
2366 if (size >= 1 << 12)
2369 if (nla[NFTA_RULE_USERDATA]) {
2370 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
2372 usize = sizeof(struct nft_userdata) + ulen;
2376 rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL);
2380 nft_activate_next(net, rule);
2382 rule->handle = handle;
2384 rule->udata = ulen ? 1 : 0;
2387 udata = nft_userdata(rule);
2388 udata->len = ulen - 1;
2389 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
2392 expr = nft_expr_first(rule);
2393 for (i = 0; i < n; i++) {
2394 err = nf_tables_newexpr(&ctx, &info[i], expr);
2398 expr = nft_expr_next(expr);
2401 if (nlh->nlmsg_flags & NLM_F_REPLACE) {
2402 if (!nft_is_active_next(net, old_rule)) {
2406 trans = nft_trans_rule_add(&ctx, NFT_MSG_DELRULE,
2408 if (trans == NULL) {
2412 nft_deactivate_next(net, old_rule);
2415 if (nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule) == NULL) {
2420 list_add_tail_rcu(&rule->list, &old_rule->list);
2422 if (nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule) == NULL) {
2427 if (nlh->nlmsg_flags & NLM_F_APPEND) {
2429 list_add_rcu(&rule->list, &old_rule->list);
2431 list_add_tail_rcu(&rule->list, &chain->rules);
2434 list_add_tail_rcu(&rule->list, &old_rule->list);
2436 list_add_rcu(&rule->list, &chain->rules);
2443 nf_tables_rule_release(&ctx, rule);
2445 for (i = 0; i < n; i++) {
2446 if (info[i].ops != NULL)
2447 module_put(info[i].ops->type->owner);
2452 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
2453 const struct nlattr *nla)
2455 u32 id = ntohl(nla_get_be32(nla));
2456 struct nft_trans *trans;
2458 list_for_each_entry(trans, &net->nft.commit_list, list) {
2459 struct nft_rule *rule = nft_trans_rule(trans);
2461 if (trans->msg_type == NFT_MSG_NEWRULE &&
2462 id == nft_trans_rule_id(trans))
2465 return ERR_PTR(-ENOENT);
2468 static int nf_tables_delrule(struct net *net, struct sock *nlsk,
2469 struct sk_buff *skb, const struct nlmsghdr *nlh,
2470 const struct nlattr * const nla[],
2471 struct netlink_ext_ack *extack)
2473 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2474 u8 genmask = nft_genmask_next(net);
2475 struct nft_table *table;
2476 struct nft_chain *chain = NULL;
2477 struct nft_rule *rule;
2478 int family = nfmsg->nfgen_family, err = 0;
2481 table = nf_tables_table_lookup(net, nla[NFTA_RULE_TABLE], family,
2484 return PTR_ERR(table);
2486 if (nla[NFTA_RULE_CHAIN]) {
2487 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN],
2490 return PTR_ERR(chain);
2493 nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
2496 if (nla[NFTA_RULE_HANDLE]) {
2497 rule = nf_tables_rule_lookup(chain,
2498 nla[NFTA_RULE_HANDLE]);
2500 return PTR_ERR(rule);
2502 err = nft_delrule(&ctx, rule);
2503 } else if (nla[NFTA_RULE_ID]) {
2504 rule = nft_rule_lookup_byid(net, nla[NFTA_RULE_ID]);
2506 return PTR_ERR(rule);
2508 err = nft_delrule(&ctx, rule);
2510 err = nft_delrule_by_chain(&ctx);
2513 list_for_each_entry(chain, &table->chains, list) {
2514 if (!nft_is_active_next(net, chain))
2518 err = nft_delrule_by_chain(&ctx);
2531 static LIST_HEAD(nf_tables_set_types);
2533 int nft_register_set(struct nft_set_type *type)
2535 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2536 list_add_tail_rcu(&type->list, &nf_tables_set_types);
2537 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2540 EXPORT_SYMBOL_GPL(nft_register_set);
2542 void nft_unregister_set(struct nft_set_type *type)
2544 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2545 list_del_rcu(&type->list);
2546 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2548 EXPORT_SYMBOL_GPL(nft_unregister_set);
2550 #define NFT_SET_FEATURES (NFT_SET_INTERVAL | NFT_SET_MAP | \
2551 NFT_SET_TIMEOUT | NFT_SET_OBJECT)
2553 static bool nft_set_ops_candidate(const struct nft_set_ops *ops, u32 flags)
2555 if ((flags & NFT_SET_EVAL) && !ops->update)
2558 return (flags & ops->features) == (flags & NFT_SET_FEATURES);
2562 * Select a set implementation based on the data characteristics and the
2563 * given policy. The total memory use might not be known if no size is
2564 * given, in that case the amount of memory per element is used.
2566 static const struct nft_set_ops *
2567 nft_select_set_ops(const struct nft_ctx *ctx,
2568 const struct nlattr * const nla[],
2569 const struct nft_set_desc *desc,
2570 enum nft_set_policies policy)
2572 const struct nft_set_ops *ops, *bops;
2573 struct nft_set_estimate est, best;
2574 const struct nft_set_type *type;
2577 #ifdef CONFIG_MODULES
2578 if (list_empty(&nf_tables_set_types)) {
2579 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2580 request_module("nft-set");
2581 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2582 if (!list_empty(&nf_tables_set_types))
2583 return ERR_PTR(-EAGAIN);
2586 if (nla[NFTA_SET_FLAGS] != NULL)
2587 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
2594 list_for_each_entry(type, &nf_tables_set_types, list) {
2595 if (!type->select_ops)
2598 ops = type->select_ops(ctx, desc, flags);
2602 if (!nft_set_ops_candidate(ops, flags))
2604 if (!ops->estimate(desc, flags, &est))
2608 case NFT_SET_POL_PERFORMANCE:
2609 if (est.lookup < best.lookup)
2611 if (est.lookup == best.lookup &&
2612 est.space < best.space)
2615 case NFT_SET_POL_MEMORY:
2617 if (est.space < best.space)
2619 if (est.space == best.space &&
2620 est.lookup < best.lookup)
2622 } else if (est.size < best.size || !bops) {
2630 if (!try_module_get(type->owner))
2633 module_put(bops->type->owner);
2642 return ERR_PTR(-EOPNOTSUPP);
2645 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
2646 [NFTA_SET_TABLE] = { .type = NLA_STRING,
2647 .len = NFT_TABLE_MAXNAMELEN - 1 },
2648 [NFTA_SET_NAME] = { .type = NLA_STRING,
2649 .len = NFT_SET_MAXNAMELEN - 1 },
2650 [NFTA_SET_FLAGS] = { .type = NLA_U32 },
2651 [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 },
2652 [NFTA_SET_KEY_LEN] = { .type = NLA_U32 },
2653 [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 },
2654 [NFTA_SET_DATA_LEN] = { .type = NLA_U32 },
2655 [NFTA_SET_POLICY] = { .type = NLA_U32 },
2656 [NFTA_SET_DESC] = { .type = NLA_NESTED },
2657 [NFTA_SET_ID] = { .type = NLA_U32 },
2658 [NFTA_SET_TIMEOUT] = { .type = NLA_U64 },
2659 [NFTA_SET_GC_INTERVAL] = { .type = NLA_U32 },
2660 [NFTA_SET_USERDATA] = { .type = NLA_BINARY,
2661 .len = NFT_USERDATA_MAXLEN },
2662 [NFTA_SET_OBJ_TYPE] = { .type = NLA_U32 },
2663 [NFTA_SET_HANDLE] = { .type = NLA_U64 },
2666 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
2667 [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 },
2670 static int nft_ctx_init_from_setattr(struct nft_ctx *ctx, struct net *net,
2671 const struct sk_buff *skb,
2672 const struct nlmsghdr *nlh,
2673 const struct nlattr * const nla[],
2676 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2677 int family = nfmsg->nfgen_family;
2678 struct nft_table *table = NULL;
2680 if (nla[NFTA_SET_TABLE] != NULL) {
2681 table = nf_tables_table_lookup(net, nla[NFTA_SET_TABLE],
2684 return PTR_ERR(table);
2687 nft_ctx_init(ctx, net, skb, nlh, family, table, NULL, nla);
2691 static struct nft_set *nf_tables_set_lookup(const struct nft_table *table,
2692 const struct nlattr *nla, u8 genmask)
2694 struct nft_set *set;
2697 return ERR_PTR(-EINVAL);
2699 list_for_each_entry(set, &table->sets, list) {
2700 if (!nla_strcmp(nla, set->name) &&
2701 nft_active_genmask(set, genmask))
2704 return ERR_PTR(-ENOENT);
2707 static struct nft_set *nf_tables_set_lookup_byhandle(const struct nft_table *table,
2708 const struct nlattr *nla, u8 genmask)
2710 struct nft_set *set;
2713 return ERR_PTR(-EINVAL);
2715 list_for_each_entry(set, &table->sets, list) {
2716 if (be64_to_cpu(nla_get_be64(nla)) == set->handle &&
2717 nft_active_genmask(set, genmask))
2720 return ERR_PTR(-ENOENT);
2723 static struct nft_set *nf_tables_set_lookup_byid(const struct net *net,
2724 const struct nlattr *nla,
2727 struct nft_trans *trans;
2728 u32 id = ntohl(nla_get_be32(nla));
2730 list_for_each_entry(trans, &net->nft.commit_list, list) {
2731 if (trans->msg_type == NFT_MSG_NEWSET) {
2732 struct nft_set *set = nft_trans_set(trans);
2734 if (id == nft_trans_set_id(trans) &&
2735 nft_active_genmask(set, genmask))
2739 return ERR_PTR(-ENOENT);
2742 struct nft_set *nft_set_lookup_global(const struct net *net,
2743 const struct nft_table *table,
2744 const struct nlattr *nla_set_name,
2745 const struct nlattr *nla_set_id,
2748 struct nft_set *set;
2750 set = nf_tables_set_lookup(table, nla_set_name, genmask);
2755 set = nf_tables_set_lookup_byid(net, nla_set_id, genmask);
2759 EXPORT_SYMBOL_GPL(nft_set_lookup_global);
2761 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
2764 const struct nft_set *i;
2766 unsigned long *inuse;
2767 unsigned int n = 0, min = 0;
2769 p = strchr(name, '%');
2771 if (p[1] != 'd' || strchr(p + 2, '%'))
2774 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
2778 list_for_each_entry(i, &ctx->table->sets, list) {
2781 if (!nft_is_active_next(ctx->net, set))
2783 if (!sscanf(i->name, name, &tmp))
2785 if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
2788 set_bit(tmp - min, inuse);
2791 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
2792 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
2793 min += BITS_PER_BYTE * PAGE_SIZE;
2794 memset(inuse, 0, PAGE_SIZE);
2797 free_page((unsigned long)inuse);
2800 set->name = kasprintf(GFP_KERNEL, name, min + n);
2804 list_for_each_entry(i, &ctx->table->sets, list) {
2805 if (!nft_is_active_next(ctx->net, i))
2807 if (!strcmp(set->name, i->name)) {
2815 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
2816 const struct nft_set *set, u16 event, u16 flags)
2818 struct nfgenmsg *nfmsg;
2819 struct nlmsghdr *nlh;
2820 struct nlattr *desc;
2821 u32 portid = ctx->portid;
2824 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
2825 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
2828 goto nla_put_failure;
2830 nfmsg = nlmsg_data(nlh);
2831 nfmsg->nfgen_family = ctx->family;
2832 nfmsg->version = NFNETLINK_V0;
2833 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
2835 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
2836 goto nla_put_failure;
2837 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
2838 goto nla_put_failure;
2839 if (nla_put_be64(skb, NFTA_SET_HANDLE, cpu_to_be64(set->handle),
2841 goto nla_put_failure;
2842 if (set->flags != 0)
2843 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
2844 goto nla_put_failure;
2846 if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
2847 goto nla_put_failure;
2848 if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
2849 goto nla_put_failure;
2850 if (set->flags & NFT_SET_MAP) {
2851 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
2852 goto nla_put_failure;
2853 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
2854 goto nla_put_failure;
2856 if (set->flags & NFT_SET_OBJECT &&
2857 nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
2858 goto nla_put_failure;
2861 nla_put_be64(skb, NFTA_SET_TIMEOUT,
2862 cpu_to_be64(jiffies_to_msecs(set->timeout)),
2864 goto nla_put_failure;
2866 nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(set->gc_int)))
2867 goto nla_put_failure;
2869 if (set->policy != NFT_SET_POL_PERFORMANCE) {
2870 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
2871 goto nla_put_failure;
2874 if (nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
2875 goto nla_put_failure;
2877 desc = nla_nest_start(skb, NFTA_SET_DESC);
2879 goto nla_put_failure;
2881 nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
2882 goto nla_put_failure;
2883 nla_nest_end(skb, desc);
2885 nlmsg_end(skb, nlh);
2889 nlmsg_trim(skb, nlh);
2893 static void nf_tables_set_notify(const struct nft_ctx *ctx,
2894 const struct nft_set *set, int event,
2897 struct sk_buff *skb;
2898 u32 portid = ctx->portid;
2902 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
2905 skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
2909 err = nf_tables_fill_set(skb, ctx, set, event, 0);
2915 nfnetlink_send(skb, ctx->net, portid, NFNLGRP_NFTABLES, ctx->report,
2919 nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
2922 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
2924 const struct nft_set *set;
2925 unsigned int idx, s_idx = cb->args[0];
2926 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
2927 struct net *net = sock_net(skb->sk);
2928 struct nft_ctx *ctx = cb->data, ctx_set;
2934 cb->seq = net->nft.base_seq;
2936 list_for_each_entry_rcu(table, &net->nft.tables, list) {
2937 if (ctx->family != NFPROTO_UNSPEC &&
2938 ctx->family != table->family)
2941 if (ctx->table && ctx->table != table)
2945 if (cur_table != table)
2951 list_for_each_entry_rcu(set, &table->sets, list) {
2954 if (!nft_is_active(net, set))
2958 ctx_set.table = table;
2959 ctx_set.family = table->family;
2961 if (nf_tables_fill_set(skb, &ctx_set, set,
2965 cb->args[2] = (unsigned long) table;
2968 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
2981 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
2987 static int nf_tables_getset(struct net *net, struct sock *nlsk,
2988 struct sk_buff *skb, const struct nlmsghdr *nlh,
2989 const struct nlattr * const nla[],
2990 struct netlink_ext_ack *extack)
2992 u8 genmask = nft_genmask_cur(net);
2993 const struct nft_set *set;
2995 struct sk_buff *skb2;
2996 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2999 /* Verify existence before starting dump */
3000 err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, genmask);
3004 if (nlh->nlmsg_flags & NLM_F_DUMP) {
3005 struct netlink_dump_control c = {
3006 .dump = nf_tables_dump_sets,
3007 .done = nf_tables_dump_sets_done,
3009 struct nft_ctx *ctx_dump;
3011 ctx_dump = kmalloc(sizeof(*ctx_dump), GFP_KERNEL);
3012 if (ctx_dump == NULL)
3018 return netlink_dump_start(nlsk, skb, nlh, &c);
3021 /* Only accept unspec with dump */
3022 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
3023 return -EAFNOSUPPORT;
3024 if (!nla[NFTA_SET_TABLE])
3027 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME], genmask);
3029 return PTR_ERR(set);
3031 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
3035 err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
3039 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
3046 static int nf_tables_set_desc_parse(const struct nft_ctx *ctx,
3047 struct nft_set_desc *desc,
3048 const struct nlattr *nla)
3050 struct nlattr *da[NFTA_SET_DESC_MAX + 1];
3053 err = nla_parse_nested(da, NFTA_SET_DESC_MAX, nla,
3054 nft_set_desc_policy, NULL);
3058 if (da[NFTA_SET_DESC_SIZE] != NULL)
3059 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
3064 static int nf_tables_newset(struct net *net, struct sock *nlsk,
3065 struct sk_buff *skb, const struct nlmsghdr *nlh,
3066 const struct nlattr * const nla[],
3067 struct netlink_ext_ack *extack)
3069 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3070 u8 genmask = nft_genmask_next(net);
3071 int family = nfmsg->nfgen_family;
3072 const struct nft_set_ops *ops;
3073 struct nft_table *table;
3074 struct nft_set *set;
3080 u32 ktype, dtype, flags, policy, gc_int, objtype;
3081 struct nft_set_desc desc;
3082 unsigned char *udata;
3086 if (nla[NFTA_SET_TABLE] == NULL ||
3087 nla[NFTA_SET_NAME] == NULL ||
3088 nla[NFTA_SET_KEY_LEN] == NULL ||
3089 nla[NFTA_SET_ID] == NULL)
3092 memset(&desc, 0, sizeof(desc));
3094 ktype = NFT_DATA_VALUE;
3095 if (nla[NFTA_SET_KEY_TYPE] != NULL) {
3096 ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
3097 if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
3101 desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
3102 if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
3106 if (nla[NFTA_SET_FLAGS] != NULL) {
3107 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
3108 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
3109 NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
3110 NFT_SET_MAP | NFT_SET_EVAL |
3113 /* Only one of these operations is supported */
3114 if ((flags & (NFT_SET_MAP | NFT_SET_EVAL | NFT_SET_OBJECT)) ==
3115 (NFT_SET_MAP | NFT_SET_EVAL | NFT_SET_OBJECT))
3120 if (nla[NFTA_SET_DATA_TYPE] != NULL) {
3121 if (!(flags & NFT_SET_MAP))
3124 dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
3125 if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
3126 dtype != NFT_DATA_VERDICT)
3129 if (dtype != NFT_DATA_VERDICT) {
3130 if (nla[NFTA_SET_DATA_LEN] == NULL)
3132 desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
3133 if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
3136 desc.dlen = sizeof(struct nft_verdict);
3137 } else if (flags & NFT_SET_MAP)
3140 if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
3141 if (!(flags & NFT_SET_OBJECT))
3144 objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
3145 if (objtype == NFT_OBJECT_UNSPEC ||
3146 objtype > NFT_OBJECT_MAX)
3148 } else if (flags & NFT_SET_OBJECT)
3151 objtype = NFT_OBJECT_UNSPEC;
3154 if (nla[NFTA_SET_TIMEOUT] != NULL) {
3155 if (!(flags & NFT_SET_TIMEOUT))
3157 timeout = msecs_to_jiffies(be64_to_cpu(nla_get_be64(
3158 nla[NFTA_SET_TIMEOUT])));
3161 if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
3162 if (!(flags & NFT_SET_TIMEOUT))
3164 gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
3167 policy = NFT_SET_POL_PERFORMANCE;
3168 if (nla[NFTA_SET_POLICY] != NULL)
3169 policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
3171 if (nla[NFTA_SET_DESC] != NULL) {
3172 err = nf_tables_set_desc_parse(&ctx, &desc, nla[NFTA_SET_DESC]);
3177 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
3179 table = nf_tables_table_lookup(net, nla[NFTA_SET_TABLE], family,
3182 return PTR_ERR(table);
3184 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
3186 set = nf_tables_set_lookup(table, nla[NFTA_SET_NAME], genmask);
3188 if (PTR_ERR(set) != -ENOENT)
3189 return PTR_ERR(set);
3191 if (nlh->nlmsg_flags & NLM_F_EXCL)
3193 if (nlh->nlmsg_flags & NLM_F_REPLACE)
3198 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
3201 ops = nft_select_set_ops(&ctx, nla, &desc, policy);
3203 return PTR_ERR(ops);
3206 if (nla[NFTA_SET_USERDATA])
3207 udlen = nla_len(nla[NFTA_SET_USERDATA]);
3210 if (ops->privsize != NULL)
3211 size = ops->privsize(nla, &desc);
3213 set = kvzalloc(sizeof(*set) + size + udlen, GFP_KERNEL);
3219 name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL);
3225 err = nf_tables_set_alloc_name(&ctx, set, name);
3232 udata = set->data + size;
3233 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
3236 INIT_LIST_HEAD(&set->bindings);
3239 set->klen = desc.klen;
3241 set->objtype = objtype;
3242 set->dlen = desc.dlen;
3244 set->size = desc.size;
3245 set->policy = policy;
3248 set->timeout = timeout;
3249 set->gc_int = gc_int;
3250 set->handle = nf_tables_alloc_handle(table);
3252 err = ops->init(set, &desc, nla);
3256 err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
3260 list_add_tail_rcu(&set->list, &table->sets);
3271 module_put(ops->type->owner);
3275 static void nft_set_destroy(struct nft_set *set)
3277 set->ops->destroy(set);
3278 module_put(set->ops->type->owner);
3283 static void nf_tables_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
3285 list_del_rcu(&set->list);
3286 nf_tables_set_notify(ctx, set, NFT_MSG_DELSET, GFP_ATOMIC);
3287 nft_set_destroy(set);
3290 static int nf_tables_delset(struct net *net, struct sock *nlsk,
3291 struct sk_buff *skb, const struct nlmsghdr *nlh,
3292 const struct nlattr * const nla[],
3293 struct netlink_ext_ack *extack)
3295 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3296 u8 genmask = nft_genmask_next(net);
3297 struct nft_set *set;
3301 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
3302 return -EAFNOSUPPORT;
3303 if (nla[NFTA_SET_TABLE] == NULL)
3306 err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, genmask);
3310 if (nla[NFTA_SET_HANDLE])
3311 set = nf_tables_set_lookup_byhandle(ctx.table, nla[NFTA_SET_HANDLE], genmask);
3313 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME], genmask);
3315 return PTR_ERR(set);
3317 if (!list_empty(&set->bindings) ||
3318 (nlh->nlmsg_flags & NLM_F_NONREC && atomic_read(&set->nelems) > 0))
3321 return nft_delset(&ctx, set);
3324 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
3325 struct nft_set *set,
3326 const struct nft_set_iter *iter,
3327 struct nft_set_elem *elem)
3329 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
3330 enum nft_registers dreg;
3332 dreg = nft_type_to_reg(set->dtype);
3333 return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
3334 set->dtype == NFT_DATA_VERDICT ?
3335 NFT_DATA_VERDICT : NFT_DATA_VALUE,
3339 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
3340 struct nft_set_binding *binding)
3342 struct nft_set_binding *i;
3343 struct nft_set_iter iter;
3345 if (!list_empty(&set->bindings) && nft_set_is_anonymous(set))
3348 if (binding->flags & NFT_SET_MAP) {
3349 /* If the set is already bound to the same chain all
3350 * jumps are already validated for that chain.
3352 list_for_each_entry(i, &set->bindings, list) {
3353 if (i->flags & NFT_SET_MAP &&
3354 i->chain == binding->chain)
3358 iter.genmask = nft_genmask_next(ctx->net);
3362 iter.fn = nf_tables_bind_check_setelem;
3364 set->ops->walk(ctx, set, &iter);
3369 binding->chain = ctx->chain;
3370 list_add_tail_rcu(&binding->list, &set->bindings);
3373 EXPORT_SYMBOL_GPL(nf_tables_bind_set);
3375 void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
3376 struct nft_set_binding *binding)
3378 list_del_rcu(&binding->list);
3380 if (list_empty(&set->bindings) && nft_set_is_anonymous(set) &&
3381 nft_is_active(ctx->net, set))
3382 nf_tables_set_destroy(ctx, set);
3384 EXPORT_SYMBOL_GPL(nf_tables_unbind_set);
3386 const struct nft_set_ext_type nft_set_ext_types[] = {
3387 [NFT_SET_EXT_KEY] = {
3388 .align = __alignof__(u32),
3390 [NFT_SET_EXT_DATA] = {
3391 .align = __alignof__(u32),
3393 [NFT_SET_EXT_EXPR] = {
3394 .align = __alignof__(struct nft_expr),
3396 [NFT_SET_EXT_OBJREF] = {
3397 .len = sizeof(struct nft_object *),
3398 .align = __alignof__(struct nft_object *),
3400 [NFT_SET_EXT_FLAGS] = {
3402 .align = __alignof__(u8),
3404 [NFT_SET_EXT_TIMEOUT] = {
3406 .align = __alignof__(u64),
3408 [NFT_SET_EXT_EXPIRATION] = {
3409 .len = sizeof(unsigned long),
3410 .align = __alignof__(unsigned long),
3412 [NFT_SET_EXT_USERDATA] = {
3413 .len = sizeof(struct nft_userdata),
3414 .align = __alignof__(struct nft_userdata),
3417 EXPORT_SYMBOL_GPL(nft_set_ext_types);
3423 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
3424 [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED },
3425 [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED },
3426 [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 },
3427 [NFTA_SET_ELEM_TIMEOUT] = { .type = NLA_U64 },
3428 [NFTA_SET_ELEM_USERDATA] = { .type = NLA_BINARY,
3429 .len = NFT_USERDATA_MAXLEN },
3430 [NFTA_SET_ELEM_EXPR] = { .type = NLA_NESTED },
3431 [NFTA_SET_ELEM_OBJREF] = { .type = NLA_STRING },
3434 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
3435 [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING,
3436 .len = NFT_TABLE_MAXNAMELEN - 1 },
3437 [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING,
3438 .len = NFT_SET_MAXNAMELEN - 1 },
3439 [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED },
3440 [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 },
3443 static int nft_ctx_init_from_elemattr(struct nft_ctx *ctx, struct net *net,
3444 const struct sk_buff *skb,
3445 const struct nlmsghdr *nlh,
3446 const struct nlattr * const nla[],
3449 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3450 int family = nfmsg->nfgen_family;
3451 struct nft_table *table;
3453 table = nf_tables_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE],
3456 return PTR_ERR(table);
3458 nft_ctx_init(ctx, net, skb, nlh, family, table, NULL, nla);
3462 static int nf_tables_fill_setelem(struct sk_buff *skb,
3463 const struct nft_set *set,
3464 const struct nft_set_elem *elem)
3466 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
3467 unsigned char *b = skb_tail_pointer(skb);
3468 struct nlattr *nest;
3470 nest = nla_nest_start(skb, NFTA_LIST_ELEM);
3472 goto nla_put_failure;
3474 if (nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
3475 NFT_DATA_VALUE, set->klen) < 0)
3476 goto nla_put_failure;
3478 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
3479 nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
3480 set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
3482 goto nla_put_failure;
3484 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR) &&
3485 nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, nft_set_ext_expr(ext)) < 0)
3486 goto nla_put_failure;
3488 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
3489 nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
3490 (*nft_set_ext_obj(ext))->name) < 0)
3491 goto nla_put_failure;
3493 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
3494 nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
3495 htonl(*nft_set_ext_flags(ext))))
3496 goto nla_put_failure;
3498 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
3499 nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
3500 cpu_to_be64(jiffies_to_msecs(
3501 *nft_set_ext_timeout(ext))),
3503 goto nla_put_failure;
3505 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
3506 unsigned long expires, now = jiffies;
3508 expires = *nft_set_ext_expiration(ext);
3509 if (time_before(now, expires))
3514 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
3515 cpu_to_be64(jiffies_to_msecs(expires)),
3517 goto nla_put_failure;
3520 if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
3521 struct nft_userdata *udata;
3523 udata = nft_set_ext_userdata(ext);
3524 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
3525 udata->len + 1, udata->data))
3526 goto nla_put_failure;
3529 nla_nest_end(skb, nest);
3537 struct nft_set_dump_args {
3538 const struct netlink_callback *cb;
3539 struct nft_set_iter iter;
3540 struct sk_buff *skb;
3543 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
3544 struct nft_set *set,
3545 const struct nft_set_iter *iter,
3546 struct nft_set_elem *elem)
3548 struct nft_set_dump_args *args;
3550 args = container_of(iter, struct nft_set_dump_args, iter);
3551 return nf_tables_fill_setelem(args->skb, set, elem);
3554 struct nft_set_dump_ctx {
3555 const struct nft_set *set;
3559 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
3561 struct nft_set_dump_ctx *dump_ctx = cb->data;
3562 struct net *net = sock_net(skb->sk);
3563 struct nft_table *table;
3564 struct nft_set *set;
3565 struct nft_set_dump_args args;
3566 bool set_found = false;
3567 struct nfgenmsg *nfmsg;
3568 struct nlmsghdr *nlh;
3569 struct nlattr *nest;
3574 list_for_each_entry_rcu(table, &net->nft.tables, list) {
3575 if (dump_ctx->ctx.family != NFPROTO_UNSPEC &&
3576 dump_ctx->ctx.family != table->family)
3579 if (table != dump_ctx->ctx.table)
3582 list_for_each_entry_rcu(set, &table->sets, list) {
3583 if (set == dump_ctx->set) {
3596 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM);
3597 portid = NETLINK_CB(cb->skb).portid;
3598 seq = cb->nlh->nlmsg_seq;
3600 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3603 goto nla_put_failure;
3605 nfmsg = nlmsg_data(nlh);
3606 nfmsg->nfgen_family = table->family;
3607 nfmsg->version = NFNETLINK_V0;
3608 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
3610 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name))
3611 goto nla_put_failure;
3612 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
3613 goto nla_put_failure;
3615 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
3617 goto nla_put_failure;
3621 args.iter.genmask = nft_genmask_cur(net);
3622 args.iter.skip = cb->args[0];
3623 args.iter.count = 0;
3625 args.iter.fn = nf_tables_dump_setelem;
3626 set->ops->walk(&dump_ctx->ctx, set, &args.iter);
3629 nla_nest_end(skb, nest);
3630 nlmsg_end(skb, nlh);
3632 if (args.iter.err && args.iter.err != -EMSGSIZE)
3633 return args.iter.err;
3634 if (args.iter.count == cb->args[0])
3637 cb->args[0] = args.iter.count;
3645 static int nf_tables_dump_set_done(struct netlink_callback *cb)
3651 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
3652 const struct nft_ctx *ctx, u32 seq,
3653 u32 portid, int event, u16 flags,
3654 const struct nft_set *set,
3655 const struct nft_set_elem *elem)
3657 struct nfgenmsg *nfmsg;
3658 struct nlmsghdr *nlh;
3659 struct nlattr *nest;
3662 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
3663 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3666 goto nla_put_failure;
3668 nfmsg = nlmsg_data(nlh);
3669 nfmsg->nfgen_family = ctx->family;
3670 nfmsg->version = NFNETLINK_V0;
3671 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
3673 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
3674 goto nla_put_failure;
3675 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
3676 goto nla_put_failure;
3678 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
3680 goto nla_put_failure;
3682 err = nf_tables_fill_setelem(skb, set, elem);
3684 goto nla_put_failure;
3686 nla_nest_end(skb, nest);
3688 nlmsg_end(skb, nlh);
3692 nlmsg_trim(skb, nlh);
3696 static int nft_setelem_parse_flags(const struct nft_set *set,
3697 const struct nlattr *attr, u32 *flags)
3702 *flags = ntohl(nla_get_be32(attr));
3703 if (*flags & ~NFT_SET_ELEM_INTERVAL_END)
3705 if (!(set->flags & NFT_SET_INTERVAL) &&
3706 *flags & NFT_SET_ELEM_INTERVAL_END)
3712 static int nft_get_set_elem(struct nft_ctx *ctx, struct nft_set *set,
3713 const struct nlattr *attr)
3715 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
3716 const struct nft_set_ext *ext;
3717 struct nft_data_desc desc;
3718 struct nft_set_elem elem;
3719 struct sk_buff *skb;
3724 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
3725 nft_set_elem_policy, NULL);
3729 if (!nla[NFTA_SET_ELEM_KEY])
3732 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
3736 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &desc,
3737 nla[NFTA_SET_ELEM_KEY]);
3742 if (desc.type != NFT_DATA_VALUE || desc.len != set->klen)
3745 priv = set->ops->get(ctx->net, set, &elem, flags);
3747 return PTR_ERR(priv);
3750 ext = nft_set_elem_ext(set, &elem);
3753 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3757 err = nf_tables_fill_setelem_info(skb, ctx, ctx->seq, ctx->portid,
3758 NFT_MSG_NEWSETELEM, 0, set, &elem);
3762 err = nfnetlink_unicast(skb, ctx->net, ctx->portid, MSG_DONTWAIT);
3763 /* This avoids a loop in nfnetlink. */
3771 /* this avoids a loop in nfnetlink. */
3772 return err == -EAGAIN ? -ENOBUFS : err;
3775 static int nf_tables_getsetelem(struct net *net, struct sock *nlsk,
3776 struct sk_buff *skb, const struct nlmsghdr *nlh,
3777 const struct nlattr * const nla[],
3778 struct netlink_ext_ack *extack)
3780 u8 genmask = nft_genmask_cur(net);
3781 struct nft_set *set;
3782 struct nlattr *attr;
3786 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, genmask);
3790 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
3793 return PTR_ERR(set);
3795 if (nlh->nlmsg_flags & NLM_F_DUMP) {
3796 struct netlink_dump_control c = {
3797 .dump = nf_tables_dump_set,
3798 .done = nf_tables_dump_set_done,
3800 struct nft_set_dump_ctx *dump_ctx;
3802 dump_ctx = kmalloc(sizeof(*dump_ctx), GFP_KERNEL);
3806 dump_ctx->set = set;
3807 dump_ctx->ctx = ctx;
3810 return netlink_dump_start(nlsk, skb, nlh, &c);
3813 if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
3816 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
3817 err = nft_get_set_elem(&ctx, set, attr);
3825 static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
3826 const struct nft_set *set,
3827 const struct nft_set_elem *elem,
3828 int event, u16 flags)
3830 struct net *net = ctx->net;
3831 u32 portid = ctx->portid;
3832 struct sk_buff *skb;
3835 if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
3838 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3842 err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
3849 nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, ctx->report,
3853 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
3856 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
3858 struct nft_set *set)
3860 struct nft_trans *trans;
3862 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
3866 nft_trans_elem_set(trans) = set;
3870 void *nft_set_elem_init(const struct nft_set *set,
3871 const struct nft_set_ext_tmpl *tmpl,
3872 const u32 *key, const u32 *data,
3873 u64 timeout, gfp_t gfp)
3875 struct nft_set_ext *ext;
3878 elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
3882 ext = nft_set_elem_ext(set, elem);
3883 nft_set_ext_init(ext, tmpl);
3885 memcpy(nft_set_ext_key(ext), key, set->klen);
3886 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
3887 memcpy(nft_set_ext_data(ext), data, set->dlen);
3888 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION))
3889 *nft_set_ext_expiration(ext) =
3891 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
3892 *nft_set_ext_timeout(ext) = timeout;
3897 void nft_set_elem_destroy(const struct nft_set *set, void *elem,
3900 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
3902 nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE);
3903 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
3904 nft_data_release(nft_set_ext_data(ext), set->dtype);
3905 if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPR))
3906 nf_tables_expr_destroy(NULL, nft_set_ext_expr(ext));
3907 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
3908 (*nft_set_ext_obj(ext))->use--;
3911 EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
3913 /* Only called from commit path, nft_set_elem_deactivate() already deals with
3914 * the refcounting from the preparation phase.
3916 static void nf_tables_set_elem_destroy(const struct nft_set *set, void *elem)
3918 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
3920 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR))
3921 nf_tables_expr_destroy(NULL, nft_set_ext_expr(ext));
3925 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
3926 const struct nlattr *attr, u32 nlmsg_flags)
3928 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
3929 u8 genmask = nft_genmask_next(ctx->net);
3930 struct nft_data_desc d1, d2;
3931 struct nft_set_ext_tmpl tmpl;
3932 struct nft_set_ext *ext, *ext2;
3933 struct nft_set_elem elem;
3934 struct nft_set_binding *binding;
3935 struct nft_object *obj = NULL;
3936 struct nft_userdata *udata;
3937 struct nft_data data;
3938 enum nft_registers dreg;
3939 struct nft_trans *trans;
3945 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
3946 nft_set_elem_policy, NULL);
3950 if (nla[NFTA_SET_ELEM_KEY] == NULL)
3953 nft_set_ext_prepare(&tmpl);
3955 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
3959 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
3961 if (set->flags & NFT_SET_MAP) {
3962 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
3963 !(flags & NFT_SET_ELEM_INTERVAL_END))
3965 if (nla[NFTA_SET_ELEM_DATA] != NULL &&
3966 flags & NFT_SET_ELEM_INTERVAL_END)
3969 if (nla[NFTA_SET_ELEM_DATA] != NULL)
3974 if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
3975 if (!(set->flags & NFT_SET_TIMEOUT))
3977 timeout = msecs_to_jiffies(be64_to_cpu(nla_get_be64(
3978 nla[NFTA_SET_ELEM_TIMEOUT])));
3979 } else if (set->flags & NFT_SET_TIMEOUT) {
3980 timeout = set->timeout;
3983 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &d1,
3984 nla[NFTA_SET_ELEM_KEY]);
3988 if (d1.type != NFT_DATA_VALUE || d1.len != set->klen)
3991 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, d1.len);
3993 nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
3994 if (timeout != set->timeout)
3995 nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
3998 if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
3999 if (!(set->flags & NFT_SET_OBJECT)) {
4003 obj = nf_tables_obj_lookup(ctx->table, nla[NFTA_SET_ELEM_OBJREF],
4004 set->objtype, genmask);
4009 nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
4012 if (nla[NFTA_SET_ELEM_DATA] != NULL) {
4013 err = nft_data_init(ctx, &data, sizeof(data), &d2,
4014 nla[NFTA_SET_ELEM_DATA]);
4019 if (set->dtype != NFT_DATA_VERDICT && d2.len != set->dlen)
4022 dreg = nft_type_to_reg(set->dtype);
4023 list_for_each_entry(binding, &set->bindings, list) {
4024 struct nft_ctx bind_ctx = {
4026 .family = ctx->family,
4027 .table = ctx->table,
4028 .chain = (struct nft_chain *)binding->chain,
4031 if (!(binding->flags & NFT_SET_MAP))
4034 err = nft_validate_register_store(&bind_ctx, dreg,
4041 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, d2.len);
4044 /* The full maximum length of userdata can exceed the maximum
4045 * offset value (U8_MAX) for following extensions, therefor it
4046 * must be the last extension added.
4049 if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
4050 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
4052 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
4057 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, data.data,
4058 timeout, GFP_KERNEL);
4059 if (elem.priv == NULL)
4062 ext = nft_set_elem_ext(set, elem.priv);
4064 *nft_set_ext_flags(ext) = flags;
4066 udata = nft_set_ext_userdata(ext);
4067 udata->len = ulen - 1;
4068 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
4071 *nft_set_ext_obj(ext) = obj;
4075 trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
4079 ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK;
4080 err = set->ops->insert(ctx->net, set, &elem, &ext2);
4082 if (err == -EEXIST) {
4083 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^
4084 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) ||
4085 nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^
4086 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF)) {
4090 if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
4091 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
4092 memcmp(nft_set_ext_data(ext),
4093 nft_set_ext_data(ext2), set->dlen) != 0) ||
4094 (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
4095 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
4096 *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
4098 else if (!(nlmsg_flags & NLM_F_EXCL))
4105 !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact)) {
4110 nft_trans_elem(trans) = elem;
4111 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
4115 set->ops->remove(ctx->net, set, &elem);
4121 if (nla[NFTA_SET_ELEM_DATA] != NULL)
4122 nft_data_release(&data, d2.type);
4124 nft_data_release(&elem.key.val, d1.type);
4129 static int nf_tables_newsetelem(struct net *net, struct sock *nlsk,
4130 struct sk_buff *skb, const struct nlmsghdr *nlh,
4131 const struct nlattr * const nla[],
4132 struct netlink_ext_ack *extack)
4134 u8 genmask = nft_genmask_next(net);
4135 const struct nlattr *attr;
4136 struct nft_set *set;
4140 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
4143 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, genmask);
4147 set = nft_set_lookup_global(net, ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
4148 nla[NFTA_SET_ELEM_LIST_SET_ID], genmask);
4150 return PTR_ERR(set);
4152 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
4155 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
4156 err = nft_add_set_elem(&ctx, set, attr, nlh->nlmsg_flags);
4164 * nft_data_hold - hold a nft_data item
4166 * @data: struct nft_data to release
4167 * @type: type of data
4169 * Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded,
4170 * NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and
4171 * NFT_GOTO verdicts. This function must be called on active data objects
4172 * from the second phase of the commit protocol.
4174 void nft_data_hold(const struct nft_data *data, enum nft_data_types type)
4176 if (type == NFT_DATA_VERDICT) {
4177 switch (data->verdict.code) {
4180 data->verdict.chain->use++;
4186 static void nft_set_elem_activate(const struct net *net,
4187 const struct nft_set *set,
4188 struct nft_set_elem *elem)
4190 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4192 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
4193 nft_data_hold(nft_set_ext_data(ext), set->dtype);
4194 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
4195 (*nft_set_ext_obj(ext))->use++;
4198 static void nft_set_elem_deactivate(const struct net *net,
4199 const struct nft_set *set,
4200 struct nft_set_elem *elem)
4202 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4204 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
4205 nft_data_release(nft_set_ext_data(ext), set->dtype);
4206 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
4207 (*nft_set_ext_obj(ext))->use--;
4210 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
4211 const struct nlattr *attr)
4213 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
4214 struct nft_set_ext_tmpl tmpl;
4215 struct nft_data_desc desc;
4216 struct nft_set_elem elem;
4217 struct nft_set_ext *ext;
4218 struct nft_trans *trans;
4223 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
4224 nft_set_elem_policy, NULL);
4229 if (nla[NFTA_SET_ELEM_KEY] == NULL)
4232 nft_set_ext_prepare(&tmpl);
4234 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
4238 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
4240 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &desc,
4241 nla[NFTA_SET_ELEM_KEY]);
4246 if (desc.type != NFT_DATA_VALUE || desc.len != set->klen)
4249 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, desc.len);
4252 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, NULL, 0,
4254 if (elem.priv == NULL)
4257 ext = nft_set_elem_ext(set, elem.priv);
4259 *nft_set_ext_flags(ext) = flags;
4261 trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
4262 if (trans == NULL) {
4267 priv = set->ops->deactivate(ctx->net, set, &elem);
4275 nft_set_elem_deactivate(ctx->net, set, &elem);
4277 nft_trans_elem(trans) = elem;
4278 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
4286 nft_data_release(&elem.key.val, desc.type);
4291 static int nft_flush_set(const struct nft_ctx *ctx,
4292 struct nft_set *set,
4293 const struct nft_set_iter *iter,
4294 struct nft_set_elem *elem)
4296 struct nft_trans *trans;
4299 trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
4300 sizeof(struct nft_trans_elem), GFP_ATOMIC);
4304 if (!set->ops->flush(ctx->net, set, elem->priv)) {
4310 nft_trans_elem_set(trans) = set;
4311 nft_trans_elem(trans) = *elem;
4312 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
4320 static int nf_tables_delsetelem(struct net *net, struct sock *nlsk,
4321 struct sk_buff *skb, const struct nlmsghdr *nlh,
4322 const struct nlattr * const nla[],
4323 struct netlink_ext_ack *extack)
4325 u8 genmask = nft_genmask_next(net);
4326 const struct nlattr *attr;
4327 struct nft_set *set;
4331 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, genmask);
4335 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
4338 return PTR_ERR(set);
4339 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
4342 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL) {
4343 struct nft_set_iter iter = {
4345 .fn = nft_flush_set,
4347 set->ops->walk(&ctx, set, &iter);
4352 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
4353 err = nft_del_setelem(&ctx, set, attr);
4362 void nft_set_gc_batch_release(struct rcu_head *rcu)
4364 struct nft_set_gc_batch *gcb;
4367 gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu);
4368 for (i = 0; i < gcb->head.cnt; i++)
4369 nft_set_elem_destroy(gcb->head.set, gcb->elems[i], true);
4372 EXPORT_SYMBOL_GPL(nft_set_gc_batch_release);
4374 struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
4377 struct nft_set_gc_batch *gcb;
4379 gcb = kzalloc(sizeof(*gcb), gfp);
4382 gcb->head.set = set;
4385 EXPORT_SYMBOL_GPL(nft_set_gc_batch_alloc);
4392 * nft_register_obj- register nf_tables stateful object type
4395 * Registers the object type for use with nf_tables. Returns zero on
4396 * success or a negative errno code otherwise.
4398 int nft_register_obj(struct nft_object_type *obj_type)
4400 if (obj_type->type == NFT_OBJECT_UNSPEC)
4403 nfnl_lock(NFNL_SUBSYS_NFTABLES);
4404 list_add_rcu(&obj_type->list, &nf_tables_objects);
4405 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
4408 EXPORT_SYMBOL_GPL(nft_register_obj);
4411 * nft_unregister_obj - unregister nf_tables object type
4414 * Unregisters the object type for use with nf_tables.
4416 void nft_unregister_obj(struct nft_object_type *obj_type)
4418 nfnl_lock(NFNL_SUBSYS_NFTABLES);
4419 list_del_rcu(&obj_type->list);
4420 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
4422 EXPORT_SYMBOL_GPL(nft_unregister_obj);
4424 struct nft_object *nf_tables_obj_lookup(const struct nft_table *table,
4425 const struct nlattr *nla,
4426 u32 objtype, u8 genmask)
4428 struct nft_object *obj;
4430 list_for_each_entry(obj, &table->objects, list) {
4431 if (!nla_strcmp(nla, obj->name) &&
4432 objtype == obj->ops->type->type &&
4433 nft_active_genmask(obj, genmask))
4436 return ERR_PTR(-ENOENT);
4438 EXPORT_SYMBOL_GPL(nf_tables_obj_lookup);
4440 static struct nft_object *nf_tables_obj_lookup_byhandle(const struct nft_table *table,
4441 const struct nlattr *nla,
4442 u32 objtype, u8 genmask)
4444 struct nft_object *obj;
4446 list_for_each_entry(obj, &table->objects, list) {
4447 if (be64_to_cpu(nla_get_be64(nla)) == obj->handle &&
4448 objtype == obj->ops->type->type &&
4449 nft_active_genmask(obj, genmask))
4452 return ERR_PTR(-ENOENT);
4455 static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
4456 [NFTA_OBJ_TABLE] = { .type = NLA_STRING,
4457 .len = NFT_TABLE_MAXNAMELEN - 1 },
4458 [NFTA_OBJ_NAME] = { .type = NLA_STRING,
4459 .len = NFT_OBJ_MAXNAMELEN - 1 },
4460 [NFTA_OBJ_TYPE] = { .type = NLA_U32 },
4461 [NFTA_OBJ_DATA] = { .type = NLA_NESTED },
4462 [NFTA_OBJ_HANDLE] = { .type = NLA_U64},
4465 static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,
4466 const struct nft_object_type *type,
4467 const struct nlattr *attr)
4470 const struct nft_object_ops *ops;
4471 struct nft_object *obj;
4474 tb = kmalloc_array(type->maxattr + 1, sizeof(*tb), GFP_KERNEL);
4479 err = nla_parse_nested(tb, type->maxattr, attr, type->policy,
4484 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
4487 if (type->select_ops) {
4488 ops = type->select_ops(ctx, (const struct nlattr * const *)tb);
4498 obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL);
4502 err = ops->init(ctx, (const struct nlattr * const *)tb, obj);
4515 return ERR_PTR(err);
4518 static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
4519 struct nft_object *obj, bool reset)
4521 struct nlattr *nest;
4523 nest = nla_nest_start(skb, attr);
4525 goto nla_put_failure;
4526 if (obj->ops->dump(skb, obj, reset) < 0)
4527 goto nla_put_failure;
4528 nla_nest_end(skb, nest);
4535 static const struct nft_object_type *__nft_obj_type_get(u32 objtype)
4537 const struct nft_object_type *type;
4539 list_for_each_entry(type, &nf_tables_objects, list) {
4540 if (objtype == type->type)
4546 static const struct nft_object_type *nft_obj_type_get(u32 objtype)
4548 const struct nft_object_type *type;
4550 type = __nft_obj_type_get(objtype);
4551 if (type != NULL && try_module_get(type->owner))
4554 #ifdef CONFIG_MODULES
4556 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
4557 request_module("nft-obj-%u", objtype);
4558 nfnl_lock(NFNL_SUBSYS_NFTABLES);
4559 if (__nft_obj_type_get(objtype))
4560 return ERR_PTR(-EAGAIN);
4563 return ERR_PTR(-ENOENT);
4566 static int nf_tables_newobj(struct net *net, struct sock *nlsk,
4567 struct sk_buff *skb, const struct nlmsghdr *nlh,
4568 const struct nlattr * const nla[],
4569 struct netlink_ext_ack *extack)
4571 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4572 const struct nft_object_type *type;
4573 u8 genmask = nft_genmask_next(net);
4574 int family = nfmsg->nfgen_family;
4575 struct nft_table *table;
4576 struct nft_object *obj;
4581 if (!nla[NFTA_OBJ_TYPE] ||
4582 !nla[NFTA_OBJ_NAME] ||
4583 !nla[NFTA_OBJ_DATA])
4586 table = nf_tables_table_lookup(net, nla[NFTA_OBJ_TABLE], family,
4589 return PTR_ERR(table);
4591 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
4592 obj = nf_tables_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask);
4599 if (nlh->nlmsg_flags & NLM_F_EXCL)
4605 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
4607 type = nft_obj_type_get(objtype);
4609 return PTR_ERR(type);
4611 obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]);
4617 obj->handle = nf_tables_alloc_handle(table);
4619 obj->name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL);
4625 err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
4629 list_add_tail_rcu(&obj->list, &table->objects);
4635 if (obj->ops->destroy)
4636 obj->ops->destroy(obj);
4639 module_put(type->owner);
4643 static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
4644 u32 portid, u32 seq, int event, u32 flags,
4645 int family, const struct nft_table *table,
4646 struct nft_object *obj, bool reset)
4648 struct nfgenmsg *nfmsg;
4649 struct nlmsghdr *nlh;
4651 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
4652 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
4654 goto nla_put_failure;
4656 nfmsg = nlmsg_data(nlh);
4657 nfmsg->nfgen_family = family;
4658 nfmsg->version = NFNETLINK_V0;
4659 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
4661 if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
4662 nla_put_string(skb, NFTA_OBJ_NAME, obj->name) ||
4663 nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) ||
4664 nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
4665 nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset) ||
4666 nla_put_be64(skb, NFTA_OBJ_HANDLE, cpu_to_be64(obj->handle),
4668 goto nla_put_failure;
4670 nlmsg_end(skb, nlh);
4674 nlmsg_trim(skb, nlh);
4678 struct nft_obj_filter {
4683 static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
4685 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
4686 const struct nft_table *table;
4687 unsigned int idx = 0, s_idx = cb->args[0];
4688 struct nft_obj_filter *filter = cb->data;
4689 struct net *net = sock_net(skb->sk);
4690 int family = nfmsg->nfgen_family;
4691 struct nft_object *obj;
4694 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
4698 cb->seq = net->nft.base_seq;
4700 list_for_each_entry_rcu(table, &net->nft.tables, list) {
4701 if (family != NFPROTO_UNSPEC && family != table->family)
4704 list_for_each_entry_rcu(obj, &table->objects, list) {
4705 if (!nft_is_active(net, obj))
4710 memset(&cb->args[1], 0,
4711 sizeof(cb->args) - sizeof(cb->args[0]));
4712 if (filter && filter->table &&
4713 strcmp(filter->table, table->name))
4716 filter->type != NFT_OBJECT_UNSPEC &&
4717 obj->ops->type->type != filter->type)
4720 if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid,
4723 NLM_F_MULTI | NLM_F_APPEND,
4724 table->family, table,
4728 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4740 static int nf_tables_dump_obj_done(struct netlink_callback *cb)
4742 struct nft_obj_filter *filter = cb->data;
4745 kfree(filter->table);
4752 static struct nft_obj_filter *
4753 nft_obj_filter_alloc(const struct nlattr * const nla[])
4755 struct nft_obj_filter *filter;
4757 filter = kzalloc(sizeof(*filter), GFP_KERNEL);
4759 return ERR_PTR(-ENOMEM);
4761 if (nla[NFTA_OBJ_TABLE]) {
4762 filter->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_KERNEL);
4763 if (!filter->table) {
4765 return ERR_PTR(-ENOMEM);
4768 if (nla[NFTA_OBJ_TYPE])
4769 filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
4774 static int nf_tables_getobj(struct net *net, struct sock *nlsk,
4775 struct sk_buff *skb, const struct nlmsghdr *nlh,
4776 const struct nlattr * const nla[],
4777 struct netlink_ext_ack *extack)
4779 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4780 u8 genmask = nft_genmask_cur(net);
4781 int family = nfmsg->nfgen_family;
4782 const struct nft_table *table;
4783 struct nft_object *obj;
4784 struct sk_buff *skb2;
4789 if (nlh->nlmsg_flags & NLM_F_DUMP) {
4790 struct netlink_dump_control c = {
4791 .dump = nf_tables_dump_obj,
4792 .done = nf_tables_dump_obj_done,
4795 if (nla[NFTA_OBJ_TABLE] ||
4796 nla[NFTA_OBJ_TYPE]) {
4797 struct nft_obj_filter *filter;
4799 filter = nft_obj_filter_alloc(nla);
4805 return netlink_dump_start(nlsk, skb, nlh, &c);
4808 if (!nla[NFTA_OBJ_NAME] ||
4809 !nla[NFTA_OBJ_TYPE])
4812 table = nf_tables_table_lookup(net, nla[NFTA_OBJ_TABLE], family,
4815 return PTR_ERR(table);
4817 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
4818 obj = nf_tables_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask);
4820 return PTR_ERR(obj);
4822 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
4826 if (NFNL_MSG_TYPE(nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
4829 err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
4830 nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
4831 family, table, obj, reset);
4835 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
4841 static void nft_obj_destroy(struct nft_object *obj)
4843 if (obj->ops->destroy)
4844 obj->ops->destroy(obj);
4846 module_put(obj->ops->type->owner);
4851 static int nf_tables_delobj(struct net *net, struct sock *nlsk,
4852 struct sk_buff *skb, const struct nlmsghdr *nlh,
4853 const struct nlattr * const nla[],
4854 struct netlink_ext_ack *extack)
4856 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4857 u8 genmask = nft_genmask_next(net);
4858 int family = nfmsg->nfgen_family;
4859 struct nft_table *table;
4860 struct nft_object *obj;
4864 if (!nla[NFTA_OBJ_TYPE] ||
4865 (!nla[NFTA_OBJ_NAME] && !nla[NFTA_OBJ_HANDLE]))
4868 table = nf_tables_table_lookup(net, nla[NFTA_OBJ_TABLE], family,
4871 return PTR_ERR(table);
4873 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
4874 if (nla[NFTA_OBJ_HANDLE])
4875 obj = nf_tables_obj_lookup_byhandle(table, nla[NFTA_OBJ_HANDLE],
4878 obj = nf_tables_obj_lookup(table, nla[NFTA_OBJ_NAME],
4881 return PTR_ERR(obj);
4885 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
4887 return nft_delobj(&ctx, obj);
4890 void nft_obj_notify(struct net *net, struct nft_table *table,
4891 struct nft_object *obj, u32 portid, u32 seq, int event,
4892 int family, int report, gfp_t gfp)
4894 struct sk_buff *skb;
4898 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
4901 skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
4905 err = nf_tables_fill_obj_info(skb, net, portid, seq, event, 0, family,
4912 nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, report, gfp);
4915 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
4917 EXPORT_SYMBOL_GPL(nft_obj_notify);
4919 static void nf_tables_obj_notify(const struct nft_ctx *ctx,
4920 struct nft_object *obj, int event)
4922 nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid, ctx->seq, event,
4923 ctx->family, ctx->report, GFP_KERNEL);
4929 void nft_register_flowtable_type(struct nf_flowtable_type *type)
4931 nfnl_lock(NFNL_SUBSYS_NFTABLES);
4932 list_add_tail_rcu(&type->list, &nf_tables_flowtables);
4933 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
4935 EXPORT_SYMBOL_GPL(nft_register_flowtable_type);
4937 void nft_unregister_flowtable_type(struct nf_flowtable_type *type)
4939 nfnl_lock(NFNL_SUBSYS_NFTABLES);
4940 list_del_rcu(&type->list);
4941 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
4943 EXPORT_SYMBOL_GPL(nft_unregister_flowtable_type);
4945 static const struct nla_policy nft_flowtable_policy[NFTA_FLOWTABLE_MAX + 1] = {
4946 [NFTA_FLOWTABLE_TABLE] = { .type = NLA_STRING,
4947 .len = NFT_NAME_MAXLEN - 1 },
4948 [NFTA_FLOWTABLE_NAME] = { .type = NLA_STRING,
4949 .len = NFT_NAME_MAXLEN - 1 },
4950 [NFTA_FLOWTABLE_HOOK] = { .type = NLA_NESTED },
4951 [NFTA_FLOWTABLE_HANDLE] = { .type = NLA_U64 },
4954 struct nft_flowtable *nf_tables_flowtable_lookup(const struct nft_table *table,
4955 const struct nlattr *nla,
4958 struct nft_flowtable *flowtable;
4960 list_for_each_entry(flowtable, &table->flowtables, list) {
4961 if (!nla_strcmp(nla, flowtable->name) &&
4962 nft_active_genmask(flowtable, genmask))
4965 return ERR_PTR(-ENOENT);
4967 EXPORT_SYMBOL_GPL(nf_tables_flowtable_lookup);
4969 static struct nft_flowtable *
4970 nf_tables_flowtable_lookup_byhandle(const struct nft_table *table,
4971 const struct nlattr *nla, u8 genmask)
4973 struct nft_flowtable *flowtable;
4975 list_for_each_entry(flowtable, &table->flowtables, list) {
4976 if (be64_to_cpu(nla_get_be64(nla)) == flowtable->handle &&
4977 nft_active_genmask(flowtable, genmask))
4980 return ERR_PTR(-ENOENT);
4983 static int nf_tables_parse_devices(const struct nft_ctx *ctx,
4984 const struct nlattr *attr,
4985 struct net_device *dev_array[], int *len)
4987 const struct nlattr *tmp;
4988 struct net_device *dev;
4989 char ifname[IFNAMSIZ];
4990 int rem, n = 0, err;
4992 nla_for_each_nested(tmp, attr, rem) {
4993 if (nla_type(tmp) != NFTA_DEVICE_NAME) {
4998 nla_strlcpy(ifname, tmp, IFNAMSIZ);
4999 dev = __dev_get_by_name(ctx->net, ifname);
5005 dev_array[n++] = dev;
5006 if (n == NFT_FLOWTABLE_DEVICE_MAX) {
5020 static const struct nla_policy nft_flowtable_hook_policy[NFTA_FLOWTABLE_HOOK_MAX + 1] = {
5021 [NFTA_FLOWTABLE_HOOK_NUM] = { .type = NLA_U32 },
5022 [NFTA_FLOWTABLE_HOOK_PRIORITY] = { .type = NLA_U32 },
5023 [NFTA_FLOWTABLE_HOOK_DEVS] = { .type = NLA_NESTED },
5026 static int nf_tables_flowtable_parse_hook(const struct nft_ctx *ctx,
5027 const struct nlattr *attr,
5028 struct nft_flowtable *flowtable)
5030 struct net_device *dev_array[NFT_FLOWTABLE_DEVICE_MAX];
5031 struct nlattr *tb[NFTA_FLOWTABLE_HOOK_MAX + 1];
5032 struct nf_hook_ops *ops;
5033 int hooknum, priority;
5036 err = nla_parse_nested(tb, NFTA_FLOWTABLE_HOOK_MAX, attr,
5037 nft_flowtable_hook_policy, NULL);
5041 if (!tb[NFTA_FLOWTABLE_HOOK_NUM] ||
5042 !tb[NFTA_FLOWTABLE_HOOK_PRIORITY] ||
5043 !tb[NFTA_FLOWTABLE_HOOK_DEVS])
5046 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
5047 if (hooknum != NF_NETDEV_INGRESS)
5050 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
5052 err = nf_tables_parse_devices(ctx, tb[NFTA_FLOWTABLE_HOOK_DEVS],
5057 ops = kzalloc(sizeof(struct nf_hook_ops) * n, GFP_KERNEL);
5061 flowtable->hooknum = hooknum;
5062 flowtable->priority = priority;
5063 flowtable->ops = ops;
5064 flowtable->ops_len = n;
5066 for (i = 0; i < n; i++) {
5067 flowtable->ops[i].pf = NFPROTO_NETDEV;
5068 flowtable->ops[i].hooknum = hooknum;
5069 flowtable->ops[i].priority = priority;
5070 flowtable->ops[i].priv = &flowtable->data.rhashtable;
5071 flowtable->ops[i].hook = flowtable->data.type->hook;
5072 flowtable->ops[i].dev = dev_array[i];
5073 flowtable->dev_name[i] = kstrdup(dev_array[i]->name,
5080 static const struct nf_flowtable_type *__nft_flowtable_type_get(u8 family)
5082 const struct nf_flowtable_type *type;
5084 list_for_each_entry(type, &nf_tables_flowtables, list) {
5085 if (family == type->family)
5091 static const struct nf_flowtable_type *nft_flowtable_type_get(u8 family)
5093 const struct nf_flowtable_type *type;
5095 type = __nft_flowtable_type_get(family);
5096 if (type != NULL && try_module_get(type->owner))
5099 #ifdef CONFIG_MODULES
5101 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
5102 request_module("nf-flowtable-%u", family);
5103 nfnl_lock(NFNL_SUBSYS_NFTABLES);
5104 if (__nft_flowtable_type_get(family))
5105 return ERR_PTR(-EAGAIN);
5108 return ERR_PTR(-ENOENT);
5111 void nft_flow_table_iterate(struct net *net,
5112 void (*iter)(struct nf_flowtable *flowtable, void *data),
5115 struct nft_flowtable *flowtable;
5116 const struct nft_table *table;
5118 nfnl_lock(NFNL_SUBSYS_NFTABLES);
5119 list_for_each_entry(table, &net->nft.tables, list) {
5120 list_for_each_entry(flowtable, &table->flowtables, list) {
5121 iter(&flowtable->data, data);
5124 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
5126 EXPORT_SYMBOL_GPL(nft_flow_table_iterate);
5128 static void nft_unregister_flowtable_net_hooks(struct net *net,
5129 struct nft_flowtable *flowtable)
5133 for (i = 0; i < flowtable->ops_len; i++) {
5134 if (!flowtable->ops[i].dev)
5137 nf_unregister_net_hook(net, &flowtable->ops[i]);
5141 static int nf_tables_newflowtable(struct net *net, struct sock *nlsk,
5142 struct sk_buff *skb,
5143 const struct nlmsghdr *nlh,
5144 const struct nlattr * const nla[],
5145 struct netlink_ext_ack *extack)
5147 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
5148 const struct nf_flowtable_type *type;
5149 struct nft_flowtable *flowtable, *ft;
5150 u8 genmask = nft_genmask_next(net);
5151 int family = nfmsg->nfgen_family;
5152 struct nft_table *table;
5156 if (!nla[NFTA_FLOWTABLE_TABLE] ||
5157 !nla[NFTA_FLOWTABLE_NAME] ||
5158 !nla[NFTA_FLOWTABLE_HOOK])
5161 table = nf_tables_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE],
5164 return PTR_ERR(table);
5166 flowtable = nf_tables_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
5168 if (IS_ERR(flowtable)) {
5169 err = PTR_ERR(flowtable);
5173 if (nlh->nlmsg_flags & NLM_F_EXCL)
5179 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
5181 flowtable = kzalloc(sizeof(*flowtable), GFP_KERNEL);
5185 flowtable->table = table;
5186 flowtable->handle = nf_tables_alloc_handle(table);
5188 flowtable->name = nla_strdup(nla[NFTA_FLOWTABLE_NAME], GFP_KERNEL);
5189 if (!flowtable->name) {
5194 type = nft_flowtable_type_get(family);
5196 err = PTR_ERR(type);
5200 flowtable->data.type = type;
5201 err = rhashtable_init(&flowtable->data.rhashtable, type->params);
5205 err = nf_tables_flowtable_parse_hook(&ctx, nla[NFTA_FLOWTABLE_HOOK],
5210 for (i = 0; i < flowtable->ops_len; i++) {
5211 if (!flowtable->ops[i].dev)
5214 list_for_each_entry(ft, &table->flowtables, list) {
5215 for (k = 0; k < ft->ops_len; k++) {
5216 if (!ft->ops[k].dev)
5219 if (flowtable->ops[i].dev == ft->ops[k].dev &&
5220 flowtable->ops[i].pf == ft->ops[k].pf) {
5227 err = nf_register_net_hook(net, &flowtable->ops[i]);
5232 err = nft_trans_flowtable_add(&ctx, NFT_MSG_NEWFLOWTABLE, flowtable);
5236 INIT_DEFERRABLE_WORK(&flowtable->data.gc_work, type->gc);
5237 queue_delayed_work(system_power_efficient_wq,
5238 &flowtable->data.gc_work, HZ);
5240 list_add_tail_rcu(&flowtable->list, &table->flowtables);
5245 i = flowtable->ops_len;
5247 for (k = i - 1; k >= 0; k--) {
5248 kfree(flowtable->dev_name[k]);
5249 nf_unregister_net_hook(net, &flowtable->ops[k]);
5252 kfree(flowtable->ops);
5254 module_put(type->owner);
5256 kfree(flowtable->name);
5262 static int nf_tables_delflowtable(struct net *net, struct sock *nlsk,
5263 struct sk_buff *skb,
5264 const struct nlmsghdr *nlh,
5265 const struct nlattr * const nla[],
5266 struct netlink_ext_ack *extack)
5268 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
5269 u8 genmask = nft_genmask_next(net);
5270 int family = nfmsg->nfgen_family;
5271 struct nft_flowtable *flowtable;
5272 struct nft_table *table;
5275 if (!nla[NFTA_FLOWTABLE_TABLE] ||
5276 (!nla[NFTA_FLOWTABLE_NAME] &&
5277 !nla[NFTA_FLOWTABLE_HANDLE]))
5280 table = nf_tables_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE],
5283 return PTR_ERR(table);
5285 if (nla[NFTA_FLOWTABLE_HANDLE])
5286 flowtable = nf_tables_flowtable_lookup_byhandle(table,
5287 nla[NFTA_FLOWTABLE_HANDLE],
5290 flowtable = nf_tables_flowtable_lookup(table,
5291 nla[NFTA_FLOWTABLE_NAME],
5293 if (IS_ERR(flowtable))
5294 return PTR_ERR(flowtable);
5295 if (flowtable->use > 0)
5298 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
5300 return nft_delflowtable(&ctx, flowtable);
5303 static int nf_tables_fill_flowtable_info(struct sk_buff *skb, struct net *net,
5304 u32 portid, u32 seq, int event,
5305 u32 flags, int family,
5306 struct nft_flowtable *flowtable)
5308 struct nlattr *nest, *nest_devs;
5309 struct nfgenmsg *nfmsg;
5310 struct nlmsghdr *nlh;
5313 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
5314 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
5316 goto nla_put_failure;
5318 nfmsg = nlmsg_data(nlh);
5319 nfmsg->nfgen_family = family;
5320 nfmsg->version = NFNETLINK_V0;
5321 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
5323 if (nla_put_string(skb, NFTA_FLOWTABLE_TABLE, flowtable->table->name) ||
5324 nla_put_string(skb, NFTA_FLOWTABLE_NAME, flowtable->name) ||
5325 nla_put_be32(skb, NFTA_FLOWTABLE_USE, htonl(flowtable->use)) ||
5326 nla_put_be64(skb, NFTA_FLOWTABLE_HANDLE, cpu_to_be64(flowtable->handle),
5327 NFTA_FLOWTABLE_PAD))
5328 goto nla_put_failure;
5330 nest = nla_nest_start(skb, NFTA_FLOWTABLE_HOOK);
5331 if (nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_NUM, htonl(flowtable->hooknum)) ||
5332 nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_PRIORITY, htonl(flowtable->priority)))
5333 goto nla_put_failure;
5335 nest_devs = nla_nest_start(skb, NFTA_FLOWTABLE_HOOK_DEVS);
5337 goto nla_put_failure;
5339 for (i = 0; i < flowtable->ops_len; i++) {
5340 if (flowtable->dev_name[i][0] &&
5341 nla_put_string(skb, NFTA_DEVICE_NAME,
5342 flowtable->dev_name[i]))
5343 goto nla_put_failure;
5345 nla_nest_end(skb, nest_devs);
5346 nla_nest_end(skb, nest);
5348 nlmsg_end(skb, nlh);
5352 nlmsg_trim(skb, nlh);
5356 struct nft_flowtable_filter {
5360 static int nf_tables_dump_flowtable(struct sk_buff *skb,
5361 struct netlink_callback *cb)
5363 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
5364 struct nft_flowtable_filter *filter = cb->data;
5365 unsigned int idx = 0, s_idx = cb->args[0];
5366 struct net *net = sock_net(skb->sk);
5367 int family = nfmsg->nfgen_family;
5368 struct nft_flowtable *flowtable;
5369 const struct nft_table *table;
5372 cb->seq = net->nft.base_seq;
5374 list_for_each_entry_rcu(table, &net->nft.tables, list) {
5375 if (family != NFPROTO_UNSPEC && family != table->family)
5378 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
5379 if (!nft_is_active(net, flowtable))
5384 memset(&cb->args[1], 0,
5385 sizeof(cb->args) - sizeof(cb->args[0]));
5386 if (filter && filter->table &&
5387 strcmp(filter->table, table->name))
5390 if (nf_tables_fill_flowtable_info(skb, net, NETLINK_CB(cb->skb).portid,
5392 NFT_MSG_NEWFLOWTABLE,
5393 NLM_F_MULTI | NLM_F_APPEND,
5394 table->family, flowtable) < 0)
5397 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
5409 static int nf_tables_dump_flowtable_done(struct netlink_callback *cb)
5411 struct nft_flowtable_filter *filter = cb->data;
5416 kfree(filter->table);
5422 static struct nft_flowtable_filter *
5423 nft_flowtable_filter_alloc(const struct nlattr * const nla[])
5425 struct nft_flowtable_filter *filter;
5427 filter = kzalloc(sizeof(*filter), GFP_KERNEL);
5429 return ERR_PTR(-ENOMEM);
5431 if (nla[NFTA_FLOWTABLE_TABLE]) {
5432 filter->table = nla_strdup(nla[NFTA_FLOWTABLE_TABLE],
5434 if (!filter->table) {
5436 return ERR_PTR(-ENOMEM);
5442 static int nf_tables_getflowtable(struct net *net, struct sock *nlsk,
5443 struct sk_buff *skb,
5444 const struct nlmsghdr *nlh,
5445 const struct nlattr * const nla[],
5446 struct netlink_ext_ack *extack)
5448 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
5449 u8 genmask = nft_genmask_cur(net);
5450 int family = nfmsg->nfgen_family;
5451 struct nft_flowtable *flowtable;
5452 const struct nft_table *table;
5453 struct sk_buff *skb2;
5456 if (nlh->nlmsg_flags & NLM_F_DUMP) {
5457 struct netlink_dump_control c = {
5458 .dump = nf_tables_dump_flowtable,
5459 .done = nf_tables_dump_flowtable_done,
5462 if (nla[NFTA_FLOWTABLE_TABLE]) {
5463 struct nft_flowtable_filter *filter;
5465 filter = nft_flowtable_filter_alloc(nla);
5471 return netlink_dump_start(nlsk, skb, nlh, &c);
5474 if (!nla[NFTA_FLOWTABLE_NAME])
5477 table = nf_tables_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE],
5480 return PTR_ERR(table);
5482 flowtable = nf_tables_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
5484 if (IS_ERR(flowtable))
5485 return PTR_ERR(flowtable);
5487 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
5491 err = nf_tables_fill_flowtable_info(skb2, net, NETLINK_CB(skb).portid,
5493 NFT_MSG_NEWFLOWTABLE, 0, family,
5498 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
5504 static void nf_tables_flowtable_notify(struct nft_ctx *ctx,
5505 struct nft_flowtable *flowtable,
5508 struct sk_buff *skb;
5512 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
5515 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
5519 err = nf_tables_fill_flowtable_info(skb, ctx->net, ctx->portid,
5521 ctx->family, flowtable);
5527 nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
5528 ctx->report, GFP_KERNEL);
5531 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
5534 static void nf_tables_flowtable_destroy(struct nft_flowtable *flowtable)
5536 cancel_delayed_work_sync(&flowtable->data.gc_work);
5537 kfree(flowtable->ops);
5538 kfree(flowtable->name);
5539 flowtable->data.type->free(&flowtable->data);
5540 rhashtable_destroy(&flowtable->data.rhashtable);
5541 module_put(flowtable->data.type->owner);
5544 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
5545 u32 portid, u32 seq)
5547 struct nlmsghdr *nlh;
5548 struct nfgenmsg *nfmsg;
5549 char buf[TASK_COMM_LEN];
5550 int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN);
5552 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), 0);
5554 goto nla_put_failure;
5556 nfmsg = nlmsg_data(nlh);
5557 nfmsg->nfgen_family = AF_UNSPEC;
5558 nfmsg->version = NFNETLINK_V0;
5559 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
5561 if (nla_put_be32(skb, NFTA_GEN_ID, htonl(net->nft.base_seq)) ||
5562 nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) ||
5563 nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current)))
5564 goto nla_put_failure;
5566 nlmsg_end(skb, nlh);
5570 nlmsg_trim(skb, nlh);
5574 static void nft_flowtable_event(unsigned long event, struct net_device *dev,
5575 struct nft_flowtable *flowtable)
5579 for (i = 0; i < flowtable->ops_len; i++) {
5580 if (flowtable->ops[i].dev != dev)
5583 nf_unregister_net_hook(dev_net(dev), &flowtable->ops[i]);
5584 flowtable->dev_name[i][0] = '\0';
5585 flowtable->ops[i].dev = NULL;
5590 static int nf_tables_flowtable_event(struct notifier_block *this,
5591 unsigned long event, void *ptr)
5593 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
5594 struct nft_flowtable *flowtable;
5595 struct nft_table *table;
5597 if (event != NETDEV_UNREGISTER)
5600 nfnl_lock(NFNL_SUBSYS_NFTABLES);
5601 list_for_each_entry(table, &dev_net(dev)->nft.tables, list) {
5602 list_for_each_entry(flowtable, &table->flowtables, list) {
5603 nft_flowtable_event(event, dev, flowtable);
5606 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
5611 static struct notifier_block nf_tables_flowtable_notifier = {
5612 .notifier_call = nf_tables_flowtable_event,
5615 static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
5618 struct nlmsghdr *nlh = nlmsg_hdr(skb);
5619 struct sk_buff *skb2;
5622 if (nlmsg_report(nlh) &&
5623 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
5626 skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
5630 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
5637 nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
5638 nlmsg_report(nlh), GFP_KERNEL);
5641 nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
5645 static int nf_tables_getgen(struct net *net, struct sock *nlsk,
5646 struct sk_buff *skb, const struct nlmsghdr *nlh,
5647 const struct nlattr * const nla[],
5648 struct netlink_ext_ack *extack)
5650 struct sk_buff *skb2;
5653 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
5657 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
5662 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
5668 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
5669 [NFT_MSG_NEWTABLE] = {
5670 .call_batch = nf_tables_newtable,
5671 .attr_count = NFTA_TABLE_MAX,
5672 .policy = nft_table_policy,
5674 [NFT_MSG_GETTABLE] = {
5675 .call = nf_tables_gettable,
5676 .attr_count = NFTA_TABLE_MAX,
5677 .policy = nft_table_policy,
5679 [NFT_MSG_DELTABLE] = {
5680 .call_batch = nf_tables_deltable,
5681 .attr_count = NFTA_TABLE_MAX,
5682 .policy = nft_table_policy,
5684 [NFT_MSG_NEWCHAIN] = {
5685 .call_batch = nf_tables_newchain,
5686 .attr_count = NFTA_CHAIN_MAX,
5687 .policy = nft_chain_policy,
5689 [NFT_MSG_GETCHAIN] = {
5690 .call = nf_tables_getchain,
5691 .attr_count = NFTA_CHAIN_MAX,
5692 .policy = nft_chain_policy,
5694 [NFT_MSG_DELCHAIN] = {
5695 .call_batch = nf_tables_delchain,
5696 .attr_count = NFTA_CHAIN_MAX,
5697 .policy = nft_chain_policy,
5699 [NFT_MSG_NEWRULE] = {
5700 .call_batch = nf_tables_newrule,
5701 .attr_count = NFTA_RULE_MAX,
5702 .policy = nft_rule_policy,
5704 [NFT_MSG_GETRULE] = {
5705 .call = nf_tables_getrule,
5706 .attr_count = NFTA_RULE_MAX,
5707 .policy = nft_rule_policy,
5709 [NFT_MSG_DELRULE] = {
5710 .call_batch = nf_tables_delrule,
5711 .attr_count = NFTA_RULE_MAX,
5712 .policy = nft_rule_policy,
5714 [NFT_MSG_NEWSET] = {
5715 .call_batch = nf_tables_newset,
5716 .attr_count = NFTA_SET_MAX,
5717 .policy = nft_set_policy,
5719 [NFT_MSG_GETSET] = {
5720 .call = nf_tables_getset,
5721 .attr_count = NFTA_SET_MAX,
5722 .policy = nft_set_policy,
5724 [NFT_MSG_DELSET] = {
5725 .call_batch = nf_tables_delset,
5726 .attr_count = NFTA_SET_MAX,
5727 .policy = nft_set_policy,
5729 [NFT_MSG_NEWSETELEM] = {
5730 .call_batch = nf_tables_newsetelem,
5731 .attr_count = NFTA_SET_ELEM_LIST_MAX,
5732 .policy = nft_set_elem_list_policy,
5734 [NFT_MSG_GETSETELEM] = {
5735 .call = nf_tables_getsetelem,
5736 .attr_count = NFTA_SET_ELEM_LIST_MAX,
5737 .policy = nft_set_elem_list_policy,
5739 [NFT_MSG_DELSETELEM] = {
5740 .call_batch = nf_tables_delsetelem,
5741 .attr_count = NFTA_SET_ELEM_LIST_MAX,
5742 .policy = nft_set_elem_list_policy,
5744 [NFT_MSG_GETGEN] = {
5745 .call = nf_tables_getgen,
5747 [NFT_MSG_NEWOBJ] = {
5748 .call_batch = nf_tables_newobj,
5749 .attr_count = NFTA_OBJ_MAX,
5750 .policy = nft_obj_policy,
5752 [NFT_MSG_GETOBJ] = {
5753 .call = nf_tables_getobj,
5754 .attr_count = NFTA_OBJ_MAX,
5755 .policy = nft_obj_policy,
5757 [NFT_MSG_DELOBJ] = {
5758 .call_batch = nf_tables_delobj,
5759 .attr_count = NFTA_OBJ_MAX,
5760 .policy = nft_obj_policy,
5762 [NFT_MSG_GETOBJ_RESET] = {
5763 .call = nf_tables_getobj,
5764 .attr_count = NFTA_OBJ_MAX,
5765 .policy = nft_obj_policy,
5767 [NFT_MSG_NEWFLOWTABLE] = {
5768 .call_batch = nf_tables_newflowtable,
5769 .attr_count = NFTA_FLOWTABLE_MAX,
5770 .policy = nft_flowtable_policy,
5772 [NFT_MSG_GETFLOWTABLE] = {
5773 .call = nf_tables_getflowtable,
5774 .attr_count = NFTA_FLOWTABLE_MAX,
5775 .policy = nft_flowtable_policy,
5777 [NFT_MSG_DELFLOWTABLE] = {
5778 .call_batch = nf_tables_delflowtable,
5779 .attr_count = NFTA_FLOWTABLE_MAX,
5780 .policy = nft_flowtable_policy,
5784 static void nft_chain_commit_update(struct nft_trans *trans)
5786 struct nft_base_chain *basechain;
5788 if (nft_trans_chain_name(trans))
5789 swap(trans->ctx.chain->name, nft_trans_chain_name(trans));
5791 if (!nft_is_base_chain(trans->ctx.chain))
5794 basechain = nft_base_chain(trans->ctx.chain);
5795 nft_chain_stats_replace(basechain, nft_trans_chain_stats(trans));
5797 switch (nft_trans_chain_policy(trans)) {
5800 basechain->policy = nft_trans_chain_policy(trans);
5805 static void nft_commit_release(struct nft_trans *trans)
5807 switch (trans->msg_type) {
5808 case NFT_MSG_DELTABLE:
5809 nf_tables_table_destroy(&trans->ctx);
5811 case NFT_MSG_DELCHAIN:
5812 nf_tables_chain_destroy(&trans->ctx);
5814 case NFT_MSG_DELRULE:
5815 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
5817 case NFT_MSG_DELSET:
5818 nft_set_destroy(nft_trans_set(trans));
5820 case NFT_MSG_DELSETELEM:
5821 nf_tables_set_elem_destroy(nft_trans_elem_set(trans),
5822 nft_trans_elem(trans).priv);
5824 case NFT_MSG_DELOBJ:
5825 nft_obj_destroy(nft_trans_obj(trans));
5827 case NFT_MSG_DELFLOWTABLE:
5828 nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
5834 static void nf_tables_commit_release(struct net *net)
5836 struct nft_trans *trans, *next;
5838 if (list_empty(&net->nft.commit_list))
5843 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
5844 list_del(&trans->list);
5845 nft_commit_release(trans);
5849 static int nf_tables_commit(struct net *net, struct sk_buff *skb)
5851 struct nft_trans *trans, *next;
5852 struct nft_trans_elem *te;
5854 /* Bump generation counter, invalidate any dump in progress */
5855 while (++net->nft.base_seq == 0);
5857 /* A new generation has just started */
5858 net->nft.gencursor = nft_gencursor_next(net);
5860 /* Make sure all packets have left the previous generation before
5861 * purging old rules.
5865 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
5866 switch (trans->msg_type) {
5867 case NFT_MSG_NEWTABLE:
5868 if (nft_trans_table_update(trans)) {
5869 if (!nft_trans_table_enable(trans)) {
5870 nf_tables_table_disable(net,
5872 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
5875 nft_clear(net, trans->ctx.table);
5877 nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
5878 nft_trans_destroy(trans);
5880 case NFT_MSG_DELTABLE:
5881 list_del_rcu(&trans->ctx.table->list);
5882 nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE);
5884 case NFT_MSG_NEWCHAIN:
5885 if (nft_trans_chain_update(trans))
5886 nft_chain_commit_update(trans);
5888 nft_clear(net, trans->ctx.chain);
5890 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
5891 nft_trans_destroy(trans);
5893 case NFT_MSG_DELCHAIN:
5894 list_del_rcu(&trans->ctx.chain->list);
5895 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN);
5896 nf_tables_unregister_hook(trans->ctx.net,
5900 case NFT_MSG_NEWRULE:
5901 nft_clear(trans->ctx.net, nft_trans_rule(trans));
5902 nf_tables_rule_notify(&trans->ctx,
5903 nft_trans_rule(trans),
5905 nft_trans_destroy(trans);
5907 case NFT_MSG_DELRULE:
5908 list_del_rcu(&nft_trans_rule(trans)->list);
5909 nf_tables_rule_notify(&trans->ctx,
5910 nft_trans_rule(trans),
5913 case NFT_MSG_NEWSET:
5914 nft_clear(net, nft_trans_set(trans));
5915 /* This avoids hitting -EBUSY when deleting the table
5916 * from the transaction.
5918 if (nft_set_is_anonymous(nft_trans_set(trans)) &&
5919 !list_empty(&nft_trans_set(trans)->bindings))
5920 trans->ctx.table->use--;
5922 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
5923 NFT_MSG_NEWSET, GFP_KERNEL);
5924 nft_trans_destroy(trans);
5926 case NFT_MSG_DELSET:
5927 list_del_rcu(&nft_trans_set(trans)->list);
5928 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
5929 NFT_MSG_DELSET, GFP_KERNEL);
5931 case NFT_MSG_NEWSETELEM:
5932 te = (struct nft_trans_elem *)trans->data;
5934 te->set->ops->activate(net, te->set, &te->elem);
5935 nf_tables_setelem_notify(&trans->ctx, te->set,
5937 NFT_MSG_NEWSETELEM, 0);
5938 nft_trans_destroy(trans);
5940 case NFT_MSG_DELSETELEM:
5941 te = (struct nft_trans_elem *)trans->data;
5943 nf_tables_setelem_notify(&trans->ctx, te->set,
5945 NFT_MSG_DELSETELEM, 0);
5946 te->set->ops->remove(net, te->set, &te->elem);
5947 atomic_dec(&te->set->nelems);
5950 case NFT_MSG_NEWOBJ:
5951 nft_clear(net, nft_trans_obj(trans));
5952 nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
5954 nft_trans_destroy(trans);
5956 case NFT_MSG_DELOBJ:
5957 list_del_rcu(&nft_trans_obj(trans)->list);
5958 nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
5961 case NFT_MSG_NEWFLOWTABLE:
5962 nft_clear(net, nft_trans_flowtable(trans));
5963 nf_tables_flowtable_notify(&trans->ctx,
5964 nft_trans_flowtable(trans),
5965 NFT_MSG_NEWFLOWTABLE);
5966 nft_trans_destroy(trans);
5968 case NFT_MSG_DELFLOWTABLE:
5969 list_del_rcu(&nft_trans_flowtable(trans)->list);
5970 nf_tables_flowtable_notify(&trans->ctx,
5971 nft_trans_flowtable(trans),
5972 NFT_MSG_DELFLOWTABLE);
5973 nft_unregister_flowtable_net_hooks(net,
5974 nft_trans_flowtable(trans));
5979 nf_tables_commit_release(net);
5980 nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
5985 static void nf_tables_abort_release(struct nft_trans *trans)
5987 switch (trans->msg_type) {
5988 case NFT_MSG_NEWTABLE:
5989 nf_tables_table_destroy(&trans->ctx);
5991 case NFT_MSG_NEWCHAIN:
5992 nf_tables_chain_destroy(&trans->ctx);
5994 case NFT_MSG_NEWRULE:
5995 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
5997 case NFT_MSG_NEWSET:
5998 nft_set_destroy(nft_trans_set(trans));
6000 case NFT_MSG_NEWSETELEM:
6001 nft_set_elem_destroy(nft_trans_elem_set(trans),
6002 nft_trans_elem(trans).priv, true);
6004 case NFT_MSG_NEWOBJ:
6005 nft_obj_destroy(nft_trans_obj(trans));
6007 case NFT_MSG_NEWFLOWTABLE:
6008 nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
6014 static int nf_tables_abort(struct net *net, struct sk_buff *skb)
6016 struct nft_trans *trans, *next;
6017 struct nft_trans_elem *te;
6019 list_for_each_entry_safe_reverse(trans, next, &net->nft.commit_list,
6021 switch (trans->msg_type) {
6022 case NFT_MSG_NEWTABLE:
6023 if (nft_trans_table_update(trans)) {
6024 if (nft_trans_table_enable(trans)) {
6025 nf_tables_table_disable(net,
6027 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
6029 nft_trans_destroy(trans);
6031 list_del_rcu(&trans->ctx.table->list);
6034 case NFT_MSG_DELTABLE:
6035 nft_clear(trans->ctx.net, trans->ctx.table);
6036 nft_trans_destroy(trans);
6038 case NFT_MSG_NEWCHAIN:
6039 if (nft_trans_chain_update(trans)) {
6040 free_percpu(nft_trans_chain_stats(trans));
6042 nft_trans_destroy(trans);
6044 trans->ctx.table->use--;
6045 list_del_rcu(&trans->ctx.chain->list);
6046 nf_tables_unregister_hook(trans->ctx.net,
6051 case NFT_MSG_DELCHAIN:
6052 trans->ctx.table->use++;
6053 nft_clear(trans->ctx.net, trans->ctx.chain);
6054 nft_trans_destroy(trans);
6056 case NFT_MSG_NEWRULE:
6057 trans->ctx.chain->use--;
6058 list_del_rcu(&nft_trans_rule(trans)->list);
6059 nft_rule_expr_deactivate(&trans->ctx, nft_trans_rule(trans));
6061 case NFT_MSG_DELRULE:
6062 trans->ctx.chain->use++;
6063 nft_clear(trans->ctx.net, nft_trans_rule(trans));
6064 nft_rule_expr_activate(&trans->ctx, nft_trans_rule(trans));
6065 nft_trans_destroy(trans);
6067 case NFT_MSG_NEWSET:
6068 trans->ctx.table->use--;
6069 list_del_rcu(&nft_trans_set(trans)->list);
6071 case NFT_MSG_DELSET:
6072 trans->ctx.table->use++;
6073 nft_clear(trans->ctx.net, nft_trans_set(trans));
6074 nft_trans_destroy(trans);
6076 case NFT_MSG_NEWSETELEM:
6077 te = (struct nft_trans_elem *)trans->data;
6079 te->set->ops->remove(net, te->set, &te->elem);
6080 atomic_dec(&te->set->nelems);
6082 case NFT_MSG_DELSETELEM:
6083 te = (struct nft_trans_elem *)trans->data;
6085 nft_set_elem_activate(net, te->set, &te->elem);
6086 te->set->ops->activate(net, te->set, &te->elem);
6089 nft_trans_destroy(trans);
6091 case NFT_MSG_NEWOBJ:
6092 trans->ctx.table->use--;
6093 list_del_rcu(&nft_trans_obj(trans)->list);
6095 case NFT_MSG_DELOBJ:
6096 trans->ctx.table->use++;
6097 nft_clear(trans->ctx.net, nft_trans_obj(trans));
6098 nft_trans_destroy(trans);
6100 case NFT_MSG_NEWFLOWTABLE:
6101 trans->ctx.table->use--;
6102 list_del_rcu(&nft_trans_flowtable(trans)->list);
6103 nft_unregister_flowtable_net_hooks(net,
6104 nft_trans_flowtable(trans));
6106 case NFT_MSG_DELFLOWTABLE:
6107 trans->ctx.table->use++;
6108 nft_clear(trans->ctx.net, nft_trans_flowtable(trans));
6109 nft_trans_destroy(trans);
6116 list_for_each_entry_safe_reverse(trans, next,
6117 &net->nft.commit_list, list) {
6118 list_del(&trans->list);
6119 nf_tables_abort_release(trans);
6125 static bool nf_tables_valid_genid(struct net *net, u32 genid)
6127 return net->nft.base_seq == genid;
6130 static const struct nfnetlink_subsystem nf_tables_subsys = {
6131 .name = "nf_tables",
6132 .subsys_id = NFNL_SUBSYS_NFTABLES,
6133 .cb_count = NFT_MSG_MAX,
6135 .commit = nf_tables_commit,
6136 .abort = nf_tables_abort,
6137 .valid_genid = nf_tables_valid_genid,
6140 int nft_chain_validate_dependency(const struct nft_chain *chain,
6141 enum nft_chain_types type)
6143 const struct nft_base_chain *basechain;
6145 if (nft_is_base_chain(chain)) {
6146 basechain = nft_base_chain(chain);
6147 if (basechain->type->type != type)
6152 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
6154 int nft_chain_validate_hooks(const struct nft_chain *chain,
6155 unsigned int hook_flags)
6157 struct nft_base_chain *basechain;
6159 if (nft_is_base_chain(chain)) {
6160 basechain = nft_base_chain(chain);
6162 if ((1 << basechain->ops.hooknum) & hook_flags)
6170 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
6173 * Loop detection - walk through the ruleset beginning at the destination chain
6174 * of a new jump until either the source chain is reached (loop) or all
6175 * reachable chains have been traversed.
6177 * The loop check is performed whenever a new jump verdict is added to an
6178 * expression or verdict map or a verdict map is bound to a new chain.
6181 static int nf_tables_check_loops(const struct nft_ctx *ctx,
6182 const struct nft_chain *chain);
6184 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
6185 struct nft_set *set,
6186 const struct nft_set_iter *iter,
6187 struct nft_set_elem *elem)
6189 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6190 const struct nft_data *data;
6192 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
6193 *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
6196 data = nft_set_ext_data(ext);
6197 switch (data->verdict.code) {
6200 return nf_tables_check_loops(ctx, data->verdict.chain);
6206 static int nf_tables_check_loops(const struct nft_ctx *ctx,
6207 const struct nft_chain *chain)
6209 const struct nft_rule *rule;
6210 const struct nft_expr *expr, *last;
6211 struct nft_set *set;
6212 struct nft_set_binding *binding;
6213 struct nft_set_iter iter;
6215 if (ctx->chain == chain)
6218 list_for_each_entry(rule, &chain->rules, list) {
6219 nft_rule_for_each_expr(expr, last, rule) {
6220 const struct nft_data *data = NULL;
6223 if (!expr->ops->validate)
6226 err = expr->ops->validate(ctx, expr, &data);
6233 switch (data->verdict.code) {
6236 err = nf_tables_check_loops(ctx,
6237 data->verdict.chain);
6246 list_for_each_entry(set, &ctx->table->sets, list) {
6247 if (!nft_is_active_next(ctx->net, set))
6249 if (!(set->flags & NFT_SET_MAP) ||
6250 set->dtype != NFT_DATA_VERDICT)
6253 list_for_each_entry(binding, &set->bindings, list) {
6254 if (!(binding->flags & NFT_SET_MAP) ||
6255 binding->chain != chain)
6258 iter.genmask = nft_genmask_next(ctx->net);
6262 iter.fn = nf_tables_loop_check_setelem;
6264 set->ops->walk(ctx, set, &iter);
6274 * nft_parse_u32_check - fetch u32 attribute and check for maximum value
6276 * @attr: netlink attribute to fetch value from
6277 * @max: maximum value to be stored in dest
6278 * @dest: pointer to the variable
6280 * Parse, check and store a given u32 netlink attribute into variable.
6281 * This function returns -ERANGE if the value goes over maximum value.
6282 * Otherwise a 0 is returned and the attribute value is stored in the
6283 * destination variable.
6285 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
6289 val = ntohl(nla_get_be32(attr));
6296 EXPORT_SYMBOL_GPL(nft_parse_u32_check);
6299 * nft_parse_register - parse a register value from a netlink attribute
6301 * @attr: netlink attribute
6303 * Parse and translate a register value from a netlink attribute.
6304 * Registers used to be 128 bit wide, these register numbers will be
6305 * mapped to the corresponding 32 bit register numbers.
6307 unsigned int nft_parse_register(const struct nlattr *attr)
6311 reg = ntohl(nla_get_be32(attr));
6313 case NFT_REG_VERDICT...NFT_REG_4:
6314 return reg * NFT_REG_SIZE / NFT_REG32_SIZE;
6316 return reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
6319 EXPORT_SYMBOL_GPL(nft_parse_register);
6322 * nft_dump_register - dump a register value to a netlink attribute
6324 * @skb: socket buffer
6325 * @attr: attribute number
6326 * @reg: register number
6328 * Construct a netlink attribute containing the register number. For
6329 * compatibility reasons, register numbers being a multiple of 4 are
6330 * translated to the corresponding 128 bit register numbers.
6332 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
6334 if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
6335 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
6337 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
6339 return nla_put_be32(skb, attr, htonl(reg));
6341 EXPORT_SYMBOL_GPL(nft_dump_register);
6344 * nft_validate_register_load - validate a load from a register
6346 * @reg: the register number
6347 * @len: the length of the data
6349 * Validate that the input register is one of the general purpose
6350 * registers and that the length of the load is within the bounds.
6352 int nft_validate_register_load(enum nft_registers reg, unsigned int len)
6354 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
6358 if (reg * NFT_REG32_SIZE + len > FIELD_SIZEOF(struct nft_regs, data))
6363 EXPORT_SYMBOL_GPL(nft_validate_register_load);
6366 * nft_validate_register_store - validate an expressions' register store
6368 * @ctx: context of the expression performing the load
6369 * @reg: the destination register number
6370 * @data: the data to load
6371 * @type: the data type
6372 * @len: the length of the data
6374 * Validate that a data load uses the appropriate data type for
6375 * the destination register and the length is within the bounds.
6376 * A value of NULL for the data means that its runtime gathered
6379 int nft_validate_register_store(const struct nft_ctx *ctx,
6380 enum nft_registers reg,
6381 const struct nft_data *data,
6382 enum nft_data_types type, unsigned int len)
6387 case NFT_REG_VERDICT:
6388 if (type != NFT_DATA_VERDICT)
6392 (data->verdict.code == NFT_GOTO ||
6393 data->verdict.code == NFT_JUMP)) {
6394 err = nf_tables_check_loops(ctx, data->verdict.chain);
6398 if (ctx->chain->level + 1 >
6399 data->verdict.chain->level) {
6400 if (ctx->chain->level + 1 == NFT_JUMP_STACK_SIZE)
6402 data->verdict.chain->level = ctx->chain->level + 1;
6408 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
6412 if (reg * NFT_REG32_SIZE + len >
6413 FIELD_SIZEOF(struct nft_regs, data))
6416 if (data != NULL && type != NFT_DATA_VALUE)
6421 EXPORT_SYMBOL_GPL(nft_validate_register_store);
6423 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
6424 [NFTA_VERDICT_CODE] = { .type = NLA_U32 },
6425 [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING,
6426 .len = NFT_CHAIN_MAXNAMELEN - 1 },
6429 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
6430 struct nft_data_desc *desc, const struct nlattr *nla)
6432 u8 genmask = nft_genmask_next(ctx->net);
6433 struct nlattr *tb[NFTA_VERDICT_MAX + 1];
6434 struct nft_chain *chain;
6437 err = nla_parse_nested(tb, NFTA_VERDICT_MAX, nla, nft_verdict_policy,
6442 if (!tb[NFTA_VERDICT_CODE])
6444 data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
6446 switch (data->verdict.code) {
6448 switch (data->verdict.code & NF_VERDICT_MASK) {
6463 if (!tb[NFTA_VERDICT_CHAIN])
6465 chain = nf_tables_chain_lookup(ctx->table,
6466 tb[NFTA_VERDICT_CHAIN], genmask);
6468 return PTR_ERR(chain);
6469 if (nft_is_base_chain(chain))
6473 data->verdict.chain = chain;
6477 desc->len = sizeof(data->verdict);
6478 desc->type = NFT_DATA_VERDICT;
6482 static void nft_verdict_uninit(const struct nft_data *data)
6484 switch (data->verdict.code) {
6487 data->verdict.chain->use--;
6492 int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
6494 struct nlattr *nest;
6496 nest = nla_nest_start(skb, type);
6498 goto nla_put_failure;
6500 if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
6501 goto nla_put_failure;
6506 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
6508 goto nla_put_failure;
6510 nla_nest_end(skb, nest);
6517 static int nft_value_init(const struct nft_ctx *ctx,
6518 struct nft_data *data, unsigned int size,
6519 struct nft_data_desc *desc, const struct nlattr *nla)
6529 nla_memcpy(data->data, nla, len);
6530 desc->type = NFT_DATA_VALUE;
6535 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
6538 return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
6541 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
6542 [NFTA_DATA_VALUE] = { .type = NLA_BINARY },
6543 [NFTA_DATA_VERDICT] = { .type = NLA_NESTED },
6547 * nft_data_init - parse nf_tables data netlink attributes
6549 * @ctx: context of the expression using the data
6550 * @data: destination struct nft_data
6551 * @size: maximum data length
6552 * @desc: data description
6553 * @nla: netlink attribute containing data
6555 * Parse the netlink data attributes and initialize a struct nft_data.
6556 * The type and length of data are returned in the data description.
6558 * The caller can indicate that it only wants to accept data of type
6559 * NFT_DATA_VALUE by passing NULL for the ctx argument.
6561 int nft_data_init(const struct nft_ctx *ctx,
6562 struct nft_data *data, unsigned int size,
6563 struct nft_data_desc *desc, const struct nlattr *nla)
6565 struct nlattr *tb[NFTA_DATA_MAX + 1];
6568 err = nla_parse_nested(tb, NFTA_DATA_MAX, nla, nft_data_policy, NULL);
6572 if (tb[NFTA_DATA_VALUE])
6573 return nft_value_init(ctx, data, size, desc,
6574 tb[NFTA_DATA_VALUE]);
6575 if (tb[NFTA_DATA_VERDICT] && ctx != NULL)
6576 return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
6579 EXPORT_SYMBOL_GPL(nft_data_init);
6582 * nft_data_release - release a nft_data item
6584 * @data: struct nft_data to release
6585 * @type: type of data
6587 * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
6588 * all others need to be released by calling this function.
6590 void nft_data_release(const struct nft_data *data, enum nft_data_types type)
6592 if (type < NFT_DATA_VERDICT)
6595 case NFT_DATA_VERDICT:
6596 return nft_verdict_uninit(data);
6601 EXPORT_SYMBOL_GPL(nft_data_release);
6603 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
6604 enum nft_data_types type, unsigned int len)
6606 struct nlattr *nest;
6609 nest = nla_nest_start(skb, attr);
6614 case NFT_DATA_VALUE:
6615 err = nft_value_dump(skb, data, len);
6617 case NFT_DATA_VERDICT:
6618 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
6625 nla_nest_end(skb, nest);
6628 EXPORT_SYMBOL_GPL(nft_data_dump);
6630 int __nft_release_basechain(struct nft_ctx *ctx)
6632 struct nft_rule *rule, *nr;
6634 BUG_ON(!nft_is_base_chain(ctx->chain));
6636 nf_tables_unregister_hook(ctx->net, ctx->chain->table, ctx->chain);
6637 list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
6638 list_del(&rule->list);
6640 nf_tables_rule_release(ctx, rule);
6642 list_del(&ctx->chain->list);
6644 nf_tables_chain_destroy(ctx);
6648 EXPORT_SYMBOL_GPL(__nft_release_basechain);
6650 static void __nft_release_tables(struct net *net)
6652 struct nft_flowtable *flowtable, *nf;
6653 struct nft_table *table, *nt;
6654 struct nft_chain *chain, *nc;
6655 struct nft_object *obj, *ne;
6656 struct nft_rule *rule, *nr;
6657 struct nft_set *set, *ns;
6658 struct nft_ctx ctx = {
6660 .family = NFPROTO_NETDEV,
6663 list_for_each_entry_safe(table, nt, &net->nft.tables, list) {
6664 ctx.family = table->family;
6666 list_for_each_entry(chain, &table->chains, list)
6667 nf_tables_unregister_hook(net, table, chain);
6668 list_for_each_entry(flowtable, &table->flowtables, list)
6669 nf_unregister_net_hooks(net, flowtable->ops,
6670 flowtable->ops_len);
6671 /* No packets are walking on these chains anymore. */
6673 list_for_each_entry(chain, &table->chains, list) {
6675 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
6676 list_del(&rule->list);
6678 nf_tables_rule_release(&ctx, rule);
6681 list_for_each_entry_safe(flowtable, nf, &table->flowtables, list) {
6682 list_del(&flowtable->list);
6684 nf_tables_flowtable_destroy(flowtable);
6686 list_for_each_entry_safe(set, ns, &table->sets, list) {
6687 list_del(&set->list);
6689 nft_set_destroy(set);
6691 list_for_each_entry_safe(obj, ne, &table->objects, list) {
6692 list_del(&obj->list);
6694 nft_obj_destroy(obj);
6696 list_for_each_entry_safe(chain, nc, &table->chains, list) {
6698 list_del(&chain->list);
6700 nf_tables_chain_destroy(&ctx);
6702 list_del(&table->list);
6703 nf_tables_table_destroy(&ctx);
6707 static int __net_init nf_tables_init_net(struct net *net)
6709 INIT_LIST_HEAD(&net->nft.tables);
6710 INIT_LIST_HEAD(&net->nft.commit_list);
6711 net->nft.base_seq = 1;
6715 static void __net_exit nf_tables_exit_net(struct net *net)
6717 __nft_release_tables(net);
6718 WARN_ON_ONCE(!list_empty(&net->nft.tables));
6719 WARN_ON_ONCE(!list_empty(&net->nft.commit_list));
6722 static struct pernet_operations nf_tables_net_ops = {
6723 .init = nf_tables_init_net,
6724 .exit = nf_tables_exit_net,
6727 static int __init nf_tables_module_init(void)
6731 nft_chain_filter_init();
6733 info = kmalloc(sizeof(struct nft_expr_info) * NFT_RULE_MAXEXPRS,
6740 err = nf_tables_core_module_init();
6744 err = nfnetlink_subsys_register(&nf_tables_subsys);
6748 register_netdevice_notifier(&nf_tables_flowtable_notifier);
6750 return register_pernet_subsys(&nf_tables_net_ops);
6752 nf_tables_core_module_exit();
6759 static void __exit nf_tables_module_exit(void)
6761 unregister_pernet_subsys(&nf_tables_net_ops);
6762 nfnetlink_subsys_unregister(&nf_tables_subsys);
6763 unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
6765 nf_tables_core_module_exit();
6767 nft_chain_filter_fini();
6770 module_init(nf_tables_module_init);
6771 module_exit(nf_tables_module_exit);
6773 MODULE_LICENSE("GPL");
6774 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
6775 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);