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/netfilter.h>
17 #include <linux/netfilter/nfnetlink.h>
18 #include <linux/netfilter/nf_tables.h>
19 #include <net/netfilter/nf_tables_core.h>
20 #include <net/netfilter/nf_tables.h>
21 #include <net/net_namespace.h>
24 static LIST_HEAD(nf_tables_expressions
);
27 * nft_register_afinfo - register nf_tables address family info
29 * @afi: address family info to register
31 * Register the address family for use with nf_tables. Returns zero on
32 * success or a negative errno code otherwise.
34 int nft_register_afinfo(struct net
*net
, struct nft_af_info
*afi
)
36 INIT_LIST_HEAD(&afi
->tables
);
37 nfnl_lock(NFNL_SUBSYS_NFTABLES
);
38 list_add_tail_rcu(&afi
->list
, &net
->nft
.af_info
);
39 nfnl_unlock(NFNL_SUBSYS_NFTABLES
);
42 EXPORT_SYMBOL_GPL(nft_register_afinfo
);
45 * nft_unregister_afinfo - unregister nf_tables address family info
47 * @afi: address family info to unregister
49 * Unregister the address family for use with nf_tables.
51 void nft_unregister_afinfo(struct nft_af_info
*afi
)
53 nfnl_lock(NFNL_SUBSYS_NFTABLES
);
54 list_del_rcu(&afi
->list
);
55 nfnl_unlock(NFNL_SUBSYS_NFTABLES
);
57 EXPORT_SYMBOL_GPL(nft_unregister_afinfo
);
59 static struct nft_af_info
*nft_afinfo_lookup(struct net
*net
, int family
)
61 struct nft_af_info
*afi
;
63 list_for_each_entry(afi
, &net
->nft
.af_info
, list
) {
64 if (afi
->family
== family
)
70 static struct nft_af_info
*
71 nf_tables_afinfo_lookup(struct net
*net
, int family
, bool autoload
)
73 struct nft_af_info
*afi
;
75 afi
= nft_afinfo_lookup(net
, family
);
80 nfnl_unlock(NFNL_SUBSYS_NFTABLES
);
81 request_module("nft-afinfo-%u", family
);
82 nfnl_lock(NFNL_SUBSYS_NFTABLES
);
83 afi
= nft_afinfo_lookup(net
, family
);
85 return ERR_PTR(-EAGAIN
);
88 return ERR_PTR(-EAFNOSUPPORT
);
91 static void nft_ctx_init(struct nft_ctx
*ctx
,
92 const struct sk_buff
*skb
,
93 const struct nlmsghdr
*nlh
,
94 struct nft_af_info
*afi
,
95 struct nft_table
*table
,
96 struct nft_chain
*chain
,
97 const struct nlattr
* const *nla
)
99 ctx
->net
= sock_net(skb
->sk
);
104 ctx
->portid
= NETLINK_CB(skb
).portid
;
105 ctx
->report
= nlmsg_report(nlh
);
106 ctx
->seq
= nlh
->nlmsg_seq
;
109 static struct nft_trans
*nft_trans_alloc(struct nft_ctx
*ctx
, int msg_type
,
112 struct nft_trans
*trans
;
114 trans
= kzalloc(sizeof(struct nft_trans
) + size
, GFP_KERNEL
);
118 trans
->msg_type
= msg_type
;
124 static void nft_trans_destroy(struct nft_trans
*trans
)
126 list_del(&trans
->list
);
130 static void nf_tables_unregister_hooks(const struct nft_table
*table
,
131 const struct nft_chain
*chain
,
132 unsigned int hook_nops
)
134 if (!(table
->flags
& NFT_TABLE_F_DORMANT
) &&
135 chain
->flags
& NFT_BASE_CHAIN
)
136 nf_unregister_hooks(nft_base_chain(chain
)->ops
, hook_nops
);
139 /* Internal table flags */
140 #define NFT_TABLE_INACTIVE (1 << 15)
142 static int nft_trans_table_add(struct nft_ctx
*ctx
, int msg_type
)
144 struct nft_trans
*trans
;
146 trans
= nft_trans_alloc(ctx
, msg_type
, sizeof(struct nft_trans_table
));
150 if (msg_type
== NFT_MSG_NEWTABLE
)
151 ctx
->table
->flags
|= NFT_TABLE_INACTIVE
;
153 list_add_tail(&trans
->list
, &ctx
->net
->nft
.commit_list
);
157 static int nft_deltable(struct nft_ctx
*ctx
)
161 err
= nft_trans_table_add(ctx
, NFT_MSG_DELTABLE
);
165 list_del_rcu(&ctx
->table
->list
);
169 static int nft_trans_chain_add(struct nft_ctx
*ctx
, int msg_type
)
171 struct nft_trans
*trans
;
173 trans
= nft_trans_alloc(ctx
, msg_type
, sizeof(struct nft_trans_chain
));
177 if (msg_type
== NFT_MSG_NEWCHAIN
)
178 ctx
->chain
->flags
|= NFT_CHAIN_INACTIVE
;
180 list_add_tail(&trans
->list
, &ctx
->net
->nft
.commit_list
);
184 static int nft_delchain(struct nft_ctx
*ctx
)
188 err
= nft_trans_chain_add(ctx
, NFT_MSG_DELCHAIN
);
193 list_del_rcu(&ctx
->chain
->list
);
199 nft_rule_is_active(struct net
*net
, const struct nft_rule
*rule
)
201 return (rule
->genmask
& (1 << net
->nft
.gencursor
)) == 0;
204 static inline int gencursor_next(struct net
*net
)
206 return net
->nft
.gencursor
+1 == 1 ? 1 : 0;
210 nft_rule_is_active_next(struct net
*net
, const struct nft_rule
*rule
)
212 return (rule
->genmask
& (1 << gencursor_next(net
))) == 0;
216 nft_rule_activate_next(struct net
*net
, struct nft_rule
*rule
)
218 /* Now inactive, will be active in the future */
219 rule
->genmask
= (1 << net
->nft
.gencursor
);
223 nft_rule_deactivate_next(struct net
*net
, struct nft_rule
*rule
)
225 rule
->genmask
= (1 << gencursor_next(net
));
228 static inline void nft_rule_clear(struct net
*net
, struct nft_rule
*rule
)
234 nf_tables_delrule_deactivate(struct nft_ctx
*ctx
, struct nft_rule
*rule
)
236 /* You cannot delete the same rule twice */
237 if (nft_rule_is_active_next(ctx
->net
, rule
)) {
238 nft_rule_deactivate_next(ctx
->net
, rule
);
245 static struct nft_trans
*nft_trans_rule_add(struct nft_ctx
*ctx
, int msg_type
,
246 struct nft_rule
*rule
)
248 struct nft_trans
*trans
;
250 trans
= nft_trans_alloc(ctx
, msg_type
, sizeof(struct nft_trans_rule
));
254 nft_trans_rule(trans
) = rule
;
255 list_add_tail(&trans
->list
, &ctx
->net
->nft
.commit_list
);
260 static int nft_delrule(struct nft_ctx
*ctx
, struct nft_rule
*rule
)
262 struct nft_trans
*trans
;
265 trans
= nft_trans_rule_add(ctx
, NFT_MSG_DELRULE
, rule
);
269 err
= nf_tables_delrule_deactivate(ctx
, rule
);
271 nft_trans_destroy(trans
);
278 static int nft_delrule_by_chain(struct nft_ctx
*ctx
)
280 struct nft_rule
*rule
;
283 list_for_each_entry(rule
, &ctx
->chain
->rules
, list
) {
284 err
= nft_delrule(ctx
, rule
);
291 /* Internal set flag */
292 #define NFT_SET_INACTIVE (1 << 15)
294 static int nft_trans_set_add(struct nft_ctx
*ctx
, int msg_type
,
297 struct nft_trans
*trans
;
299 trans
= nft_trans_alloc(ctx
, msg_type
, sizeof(struct nft_trans_set
));
303 if (msg_type
== NFT_MSG_NEWSET
&& ctx
->nla
[NFTA_SET_ID
] != NULL
) {
304 nft_trans_set_id(trans
) =
305 ntohl(nla_get_be32(ctx
->nla
[NFTA_SET_ID
]));
306 set
->flags
|= NFT_SET_INACTIVE
;
308 nft_trans_set(trans
) = set
;
309 list_add_tail(&trans
->list
, &ctx
->net
->nft
.commit_list
);
314 static int nft_delset(struct nft_ctx
*ctx
, struct nft_set
*set
)
318 err
= nft_trans_set_add(ctx
, NFT_MSG_DELSET
, set
);
322 list_del_rcu(&set
->list
);
332 static struct nft_table
*nft_table_lookup(const struct nft_af_info
*afi
,
333 const struct nlattr
*nla
)
335 struct nft_table
*table
;
337 list_for_each_entry(table
, &afi
->tables
, list
) {
338 if (!nla_strcmp(nla
, table
->name
))
344 static struct nft_table
*nf_tables_table_lookup(const struct nft_af_info
*afi
,
345 const struct nlattr
*nla
)
347 struct nft_table
*table
;
350 return ERR_PTR(-EINVAL
);
352 table
= nft_table_lookup(afi
, nla
);
356 return ERR_PTR(-ENOENT
);
359 static inline u64
nf_tables_alloc_handle(struct nft_table
*table
)
361 return ++table
->hgenerator
;
364 static const struct nf_chain_type
*chain_type
[AF_MAX
][NFT_CHAIN_T_MAX
];
366 static const struct nf_chain_type
*
367 __nf_tables_chain_type_lookup(int family
, const struct nlattr
*nla
)
371 for (i
= 0; i
< NFT_CHAIN_T_MAX
; i
++) {
372 if (chain_type
[family
][i
] != NULL
&&
373 !nla_strcmp(nla
, chain_type
[family
][i
]->name
))
374 return chain_type
[family
][i
];
379 static const struct nf_chain_type
*
380 nf_tables_chain_type_lookup(const struct nft_af_info
*afi
,
381 const struct nlattr
*nla
,
384 const struct nf_chain_type
*type
;
386 type
= __nf_tables_chain_type_lookup(afi
->family
, nla
);
389 #ifdef CONFIG_MODULES
391 nfnl_unlock(NFNL_SUBSYS_NFTABLES
);
392 request_module("nft-chain-%u-%.*s", afi
->family
,
393 nla_len(nla
), (const char *)nla_data(nla
));
394 nfnl_lock(NFNL_SUBSYS_NFTABLES
);
395 type
= __nf_tables_chain_type_lookup(afi
->family
, nla
);
397 return ERR_PTR(-EAGAIN
);
400 return ERR_PTR(-ENOENT
);
403 static const struct nla_policy nft_table_policy
[NFTA_TABLE_MAX
+ 1] = {
404 [NFTA_TABLE_NAME
] = { .type
= NLA_STRING
},
405 [NFTA_TABLE_FLAGS
] = { .type
= NLA_U32
},
408 static int nf_tables_fill_table_info(struct sk_buff
*skb
, struct net
*net
,
409 u32 portid
, u32 seq
, int event
, u32 flags
,
410 int family
, const struct nft_table
*table
)
412 struct nlmsghdr
*nlh
;
413 struct nfgenmsg
*nfmsg
;
415 event
|= NFNL_SUBSYS_NFTABLES
<< 8;
416 nlh
= nlmsg_put(skb
, portid
, seq
, event
, sizeof(struct nfgenmsg
), flags
);
418 goto nla_put_failure
;
420 nfmsg
= nlmsg_data(nlh
);
421 nfmsg
->nfgen_family
= family
;
422 nfmsg
->version
= NFNETLINK_V0
;
423 nfmsg
->res_id
= htons(net
->nft
.base_seq
& 0xffff);
425 if (nla_put_string(skb
, NFTA_TABLE_NAME
, table
->name
) ||
426 nla_put_be32(skb
, NFTA_TABLE_FLAGS
, htonl(table
->flags
)) ||
427 nla_put_be32(skb
, NFTA_TABLE_USE
, htonl(table
->use
)))
428 goto nla_put_failure
;
430 return nlmsg_end(skb
, nlh
);
433 nlmsg_trim(skb
, nlh
);
437 static int nf_tables_table_notify(const struct nft_ctx
*ctx
, int event
)
443 !nfnetlink_has_listeners(ctx
->net
, NFNLGRP_NFTABLES
))
447 skb
= nlmsg_new(NLMSG_GOODSIZE
, GFP_KERNEL
);
451 err
= nf_tables_fill_table_info(skb
, ctx
->net
, ctx
->portid
, ctx
->seq
,
452 event
, 0, ctx
->afi
->family
, ctx
->table
);
458 err
= nfnetlink_send(skb
, ctx
->net
, ctx
->portid
, NFNLGRP_NFTABLES
,
459 ctx
->report
, GFP_KERNEL
);
462 nfnetlink_set_err(ctx
->net
, ctx
->portid
, NFNLGRP_NFTABLES
,
468 static int nf_tables_dump_tables(struct sk_buff
*skb
,
469 struct netlink_callback
*cb
)
471 const struct nfgenmsg
*nfmsg
= nlmsg_data(cb
->nlh
);
472 const struct nft_af_info
*afi
;
473 const struct nft_table
*table
;
474 unsigned int idx
= 0, s_idx
= cb
->args
[0];
475 struct net
*net
= sock_net(skb
->sk
);
476 int family
= nfmsg
->nfgen_family
;
479 cb
->seq
= net
->nft
.base_seq
;
481 list_for_each_entry_rcu(afi
, &net
->nft
.af_info
, list
) {
482 if (family
!= NFPROTO_UNSPEC
&& family
!= afi
->family
)
485 list_for_each_entry_rcu(table
, &afi
->tables
, list
) {
489 memset(&cb
->args
[1], 0,
490 sizeof(cb
->args
) - sizeof(cb
->args
[0]));
491 if (nf_tables_fill_table_info(skb
, net
,
492 NETLINK_CB(cb
->skb
).portid
,
496 afi
->family
, table
) < 0)
499 nl_dump_check_consistent(cb
, nlmsg_hdr(skb
));
510 static int nf_tables_gettable(struct sock
*nlsk
, struct sk_buff
*skb
,
511 const struct nlmsghdr
*nlh
,
512 const struct nlattr
* const nla
[])
514 const struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
515 const struct nft_af_info
*afi
;
516 const struct nft_table
*table
;
517 struct sk_buff
*skb2
;
518 struct net
*net
= sock_net(skb
->sk
);
519 int family
= nfmsg
->nfgen_family
;
522 if (nlh
->nlmsg_flags
& NLM_F_DUMP
) {
523 struct netlink_dump_control c
= {
524 .dump
= nf_tables_dump_tables
,
526 return netlink_dump_start(nlsk
, skb
, nlh
, &c
);
529 afi
= nf_tables_afinfo_lookup(net
, family
, false);
533 table
= nf_tables_table_lookup(afi
, nla
[NFTA_TABLE_NAME
]);
535 return PTR_ERR(table
);
536 if (table
->flags
& NFT_TABLE_INACTIVE
)
539 skb2
= alloc_skb(NLMSG_GOODSIZE
, GFP_KERNEL
);
543 err
= nf_tables_fill_table_info(skb2
, net
, NETLINK_CB(skb
).portid
,
544 nlh
->nlmsg_seq
, NFT_MSG_NEWTABLE
, 0,
549 return nlmsg_unicast(nlsk
, skb2
, NETLINK_CB(skb
).portid
);
556 static int nf_tables_table_enable(const struct nft_af_info
*afi
,
557 struct nft_table
*table
)
559 struct nft_chain
*chain
;
562 list_for_each_entry(chain
, &table
->chains
, list
) {
563 if (!(chain
->flags
& NFT_BASE_CHAIN
))
566 err
= nf_register_hooks(nft_base_chain(chain
)->ops
, afi
->nops
);
574 list_for_each_entry(chain
, &table
->chains
, list
) {
575 if (!(chain
->flags
& NFT_BASE_CHAIN
))
581 nf_unregister_hooks(nft_base_chain(chain
)->ops
, afi
->nops
);
586 static void nf_tables_table_disable(const struct nft_af_info
*afi
,
587 struct nft_table
*table
)
589 struct nft_chain
*chain
;
591 list_for_each_entry(chain
, &table
->chains
, list
) {
592 if (chain
->flags
& NFT_BASE_CHAIN
)
593 nf_unregister_hooks(nft_base_chain(chain
)->ops
,
598 static int nf_tables_updtable(struct nft_ctx
*ctx
)
600 struct nft_trans
*trans
;
604 if (!ctx
->nla
[NFTA_TABLE_FLAGS
])
607 flags
= ntohl(nla_get_be32(ctx
->nla
[NFTA_TABLE_FLAGS
]));
608 if (flags
& ~NFT_TABLE_F_DORMANT
)
611 if (flags
== ctx
->table
->flags
)
614 trans
= nft_trans_alloc(ctx
, NFT_MSG_NEWTABLE
,
615 sizeof(struct nft_trans_table
));
619 if ((flags
& NFT_TABLE_F_DORMANT
) &&
620 !(ctx
->table
->flags
& NFT_TABLE_F_DORMANT
)) {
621 nft_trans_table_enable(trans
) = false;
622 } else if (!(flags
& NFT_TABLE_F_DORMANT
) &&
623 ctx
->table
->flags
& NFT_TABLE_F_DORMANT
) {
624 ret
= nf_tables_table_enable(ctx
->afi
, ctx
->table
);
626 ctx
->table
->flags
&= ~NFT_TABLE_F_DORMANT
;
627 nft_trans_table_enable(trans
) = true;
633 nft_trans_table_update(trans
) = true;
634 list_add_tail(&trans
->list
, &ctx
->net
->nft
.commit_list
);
637 nft_trans_destroy(trans
);
641 static int nf_tables_newtable(struct sock
*nlsk
, struct sk_buff
*skb
,
642 const struct nlmsghdr
*nlh
,
643 const struct nlattr
* const nla
[])
645 const struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
646 const struct nlattr
*name
;
647 struct nft_af_info
*afi
;
648 struct nft_table
*table
;
649 struct net
*net
= sock_net(skb
->sk
);
650 int family
= nfmsg
->nfgen_family
;
655 afi
= nf_tables_afinfo_lookup(net
, family
, true);
659 name
= nla
[NFTA_TABLE_NAME
];
660 table
= nf_tables_table_lookup(afi
, name
);
662 if (PTR_ERR(table
) != -ENOENT
)
663 return PTR_ERR(table
);
668 if (table
->flags
& NFT_TABLE_INACTIVE
)
670 if (nlh
->nlmsg_flags
& NLM_F_EXCL
)
672 if (nlh
->nlmsg_flags
& NLM_F_REPLACE
)
675 nft_ctx_init(&ctx
, skb
, nlh
, afi
, table
, NULL
, nla
);
676 return nf_tables_updtable(&ctx
);
679 if (nla
[NFTA_TABLE_FLAGS
]) {
680 flags
= ntohl(nla_get_be32(nla
[NFTA_TABLE_FLAGS
]));
681 if (flags
& ~NFT_TABLE_F_DORMANT
)
685 if (!try_module_get(afi
->owner
))
686 return -EAFNOSUPPORT
;
688 table
= kzalloc(sizeof(*table
) + nla_len(name
), GFP_KERNEL
);
690 module_put(afi
->owner
);
694 nla_strlcpy(table
->name
, name
, nla_len(name
));
695 INIT_LIST_HEAD(&table
->chains
);
696 INIT_LIST_HEAD(&table
->sets
);
697 table
->flags
= flags
;
699 nft_ctx_init(&ctx
, skb
, nlh
, afi
, table
, NULL
, nla
);
700 err
= nft_trans_table_add(&ctx
, NFT_MSG_NEWTABLE
);
703 module_put(afi
->owner
);
706 list_add_tail_rcu(&table
->list
, &afi
->tables
);
710 static int nft_flush_table(struct nft_ctx
*ctx
)
713 struct nft_chain
*chain
, *nc
;
714 struct nft_set
*set
, *ns
;
716 list_for_each_entry(chain
, &ctx
->table
->chains
, list
) {
719 err
= nft_delrule_by_chain(ctx
);
724 list_for_each_entry_safe(set
, ns
, &ctx
->table
->sets
, list
) {
725 if (set
->flags
& NFT_SET_ANONYMOUS
&&
726 !list_empty(&set
->bindings
))
729 err
= nft_delset(ctx
, set
);
734 list_for_each_entry_safe(chain
, nc
, &ctx
->table
->chains
, list
) {
737 err
= nft_delchain(ctx
);
742 err
= nft_deltable(ctx
);
747 static int nft_flush(struct nft_ctx
*ctx
, int family
)
749 struct nft_af_info
*afi
;
750 struct nft_table
*table
, *nt
;
751 const struct nlattr
* const *nla
= ctx
->nla
;
754 list_for_each_entry(afi
, &ctx
->net
->nft
.af_info
, list
) {
755 if (family
!= AF_UNSPEC
&& afi
->family
!= family
)
759 list_for_each_entry_safe(table
, nt
, &afi
->tables
, list
) {
760 if (nla
[NFTA_TABLE_NAME
] &&
761 nla_strcmp(nla
[NFTA_TABLE_NAME
], table
->name
) != 0)
766 err
= nft_flush_table(ctx
);
775 static int nf_tables_deltable(struct sock
*nlsk
, struct sk_buff
*skb
,
776 const struct nlmsghdr
*nlh
,
777 const struct nlattr
* const nla
[])
779 const struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
780 struct nft_af_info
*afi
;
781 struct nft_table
*table
;
782 struct net
*net
= sock_net(skb
->sk
);
783 int family
= nfmsg
->nfgen_family
;
786 nft_ctx_init(&ctx
, skb
, nlh
, NULL
, NULL
, NULL
, nla
);
787 if (family
== AF_UNSPEC
|| nla
[NFTA_TABLE_NAME
] == NULL
)
788 return nft_flush(&ctx
, family
);
790 afi
= nf_tables_afinfo_lookup(net
, family
, false);
794 table
= nf_tables_table_lookup(afi
, nla
[NFTA_TABLE_NAME
]);
796 return PTR_ERR(table
);
797 if (table
->flags
& NFT_TABLE_INACTIVE
)
803 return nft_flush_table(&ctx
);
806 static void nf_tables_table_destroy(struct nft_ctx
*ctx
)
808 BUG_ON(ctx
->table
->use
> 0);
811 module_put(ctx
->afi
->owner
);
814 int nft_register_chain_type(const struct nf_chain_type
*ctype
)
818 nfnl_lock(NFNL_SUBSYS_NFTABLES
);
819 if (chain_type
[ctype
->family
][ctype
->type
] != NULL
) {
823 chain_type
[ctype
->family
][ctype
->type
] = ctype
;
825 nfnl_unlock(NFNL_SUBSYS_NFTABLES
);
828 EXPORT_SYMBOL_GPL(nft_register_chain_type
);
830 void nft_unregister_chain_type(const struct nf_chain_type
*ctype
)
832 nfnl_lock(NFNL_SUBSYS_NFTABLES
);
833 chain_type
[ctype
->family
][ctype
->type
] = NULL
;
834 nfnl_unlock(NFNL_SUBSYS_NFTABLES
);
836 EXPORT_SYMBOL_GPL(nft_unregister_chain_type
);
842 static struct nft_chain
*
843 nf_tables_chain_lookup_byhandle(const struct nft_table
*table
, u64 handle
)
845 struct nft_chain
*chain
;
847 list_for_each_entry(chain
, &table
->chains
, list
) {
848 if (chain
->handle
== handle
)
852 return ERR_PTR(-ENOENT
);
855 static struct nft_chain
*nf_tables_chain_lookup(const struct nft_table
*table
,
856 const struct nlattr
*nla
)
858 struct nft_chain
*chain
;
861 return ERR_PTR(-EINVAL
);
863 list_for_each_entry(chain
, &table
->chains
, list
) {
864 if (!nla_strcmp(nla
, chain
->name
))
868 return ERR_PTR(-ENOENT
);
871 static const struct nla_policy nft_chain_policy
[NFTA_CHAIN_MAX
+ 1] = {
872 [NFTA_CHAIN_TABLE
] = { .type
= NLA_STRING
},
873 [NFTA_CHAIN_HANDLE
] = { .type
= NLA_U64
},
874 [NFTA_CHAIN_NAME
] = { .type
= NLA_STRING
,
875 .len
= NFT_CHAIN_MAXNAMELEN
- 1 },
876 [NFTA_CHAIN_HOOK
] = { .type
= NLA_NESTED
},
877 [NFTA_CHAIN_POLICY
] = { .type
= NLA_U32
},
878 [NFTA_CHAIN_TYPE
] = { .type
= NLA_STRING
},
879 [NFTA_CHAIN_COUNTERS
] = { .type
= NLA_NESTED
},
882 static const struct nla_policy nft_hook_policy
[NFTA_HOOK_MAX
+ 1] = {
883 [NFTA_HOOK_HOOKNUM
] = { .type
= NLA_U32
},
884 [NFTA_HOOK_PRIORITY
] = { .type
= NLA_U32
},
887 static int nft_dump_stats(struct sk_buff
*skb
, struct nft_stats __percpu
*stats
)
889 struct nft_stats
*cpu_stats
, total
;
895 memset(&total
, 0, sizeof(total
));
896 for_each_possible_cpu(cpu
) {
897 cpu_stats
= per_cpu_ptr(stats
, cpu
);
899 seq
= u64_stats_fetch_begin_irq(&cpu_stats
->syncp
);
900 pkts
= cpu_stats
->pkts
;
901 bytes
= cpu_stats
->bytes
;
902 } while (u64_stats_fetch_retry_irq(&cpu_stats
->syncp
, seq
));
904 total
.bytes
+= bytes
;
906 nest
= nla_nest_start(skb
, NFTA_CHAIN_COUNTERS
);
908 goto nla_put_failure
;
910 if (nla_put_be64(skb
, NFTA_COUNTER_PACKETS
, cpu_to_be64(total
.pkts
)) ||
911 nla_put_be64(skb
, NFTA_COUNTER_BYTES
, cpu_to_be64(total
.bytes
)))
912 goto nla_put_failure
;
914 nla_nest_end(skb
, nest
);
921 static int nf_tables_fill_chain_info(struct sk_buff
*skb
, struct net
*net
,
922 u32 portid
, u32 seq
, int event
, u32 flags
,
923 int family
, const struct nft_table
*table
,
924 const struct nft_chain
*chain
)
926 struct nlmsghdr
*nlh
;
927 struct nfgenmsg
*nfmsg
;
929 event
|= NFNL_SUBSYS_NFTABLES
<< 8;
930 nlh
= nlmsg_put(skb
, portid
, seq
, event
, sizeof(struct nfgenmsg
), flags
);
932 goto nla_put_failure
;
934 nfmsg
= nlmsg_data(nlh
);
935 nfmsg
->nfgen_family
= family
;
936 nfmsg
->version
= NFNETLINK_V0
;
937 nfmsg
->res_id
= htons(net
->nft
.base_seq
& 0xffff);
939 if (nla_put_string(skb
, NFTA_CHAIN_TABLE
, table
->name
))
940 goto nla_put_failure
;
941 if (nla_put_be64(skb
, NFTA_CHAIN_HANDLE
, cpu_to_be64(chain
->handle
)))
942 goto nla_put_failure
;
943 if (nla_put_string(skb
, NFTA_CHAIN_NAME
, chain
->name
))
944 goto nla_put_failure
;
946 if (chain
->flags
& NFT_BASE_CHAIN
) {
947 const struct nft_base_chain
*basechain
= nft_base_chain(chain
);
948 const struct nf_hook_ops
*ops
= &basechain
->ops
[0];
951 nest
= nla_nest_start(skb
, NFTA_CHAIN_HOOK
);
953 goto nla_put_failure
;
954 if (nla_put_be32(skb
, NFTA_HOOK_HOOKNUM
, htonl(ops
->hooknum
)))
955 goto nla_put_failure
;
956 if (nla_put_be32(skb
, NFTA_HOOK_PRIORITY
, htonl(ops
->priority
)))
957 goto nla_put_failure
;
958 nla_nest_end(skb
, nest
);
960 if (nla_put_be32(skb
, NFTA_CHAIN_POLICY
,
961 htonl(basechain
->policy
)))
962 goto nla_put_failure
;
964 if (nla_put_string(skb
, NFTA_CHAIN_TYPE
, basechain
->type
->name
))
965 goto nla_put_failure
;
967 if (nft_dump_stats(skb
, nft_base_chain(chain
)->stats
))
968 goto nla_put_failure
;
971 if (nla_put_be32(skb
, NFTA_CHAIN_USE
, htonl(chain
->use
)))
972 goto nla_put_failure
;
974 return nlmsg_end(skb
, nlh
);
977 nlmsg_trim(skb
, nlh
);
981 static int nf_tables_chain_notify(const struct nft_ctx
*ctx
, int event
)
987 !nfnetlink_has_listeners(ctx
->net
, NFNLGRP_NFTABLES
))
991 skb
= nlmsg_new(NLMSG_GOODSIZE
, GFP_KERNEL
);
995 err
= nf_tables_fill_chain_info(skb
, ctx
->net
, ctx
->portid
, ctx
->seq
,
996 event
, 0, ctx
->afi
->family
, ctx
->table
,
1003 err
= nfnetlink_send(skb
, ctx
->net
, ctx
->portid
, NFNLGRP_NFTABLES
,
1004 ctx
->report
, GFP_KERNEL
);
1007 nfnetlink_set_err(ctx
->net
, ctx
->portid
, NFNLGRP_NFTABLES
,
1013 static int nf_tables_dump_chains(struct sk_buff
*skb
,
1014 struct netlink_callback
*cb
)
1016 const struct nfgenmsg
*nfmsg
= nlmsg_data(cb
->nlh
);
1017 const struct nft_af_info
*afi
;
1018 const struct nft_table
*table
;
1019 const struct nft_chain
*chain
;
1020 unsigned int idx
= 0, s_idx
= cb
->args
[0];
1021 struct net
*net
= sock_net(skb
->sk
);
1022 int family
= nfmsg
->nfgen_family
;
1025 cb
->seq
= net
->nft
.base_seq
;
1027 list_for_each_entry_rcu(afi
, &net
->nft
.af_info
, list
) {
1028 if (family
!= NFPROTO_UNSPEC
&& family
!= afi
->family
)
1031 list_for_each_entry_rcu(table
, &afi
->tables
, list
) {
1032 list_for_each_entry_rcu(chain
, &table
->chains
, list
) {
1036 memset(&cb
->args
[1], 0,
1037 sizeof(cb
->args
) - sizeof(cb
->args
[0]));
1038 if (nf_tables_fill_chain_info(skb
, net
,
1039 NETLINK_CB(cb
->skb
).portid
,
1043 afi
->family
, table
, chain
) < 0)
1046 nl_dump_check_consistent(cb
, nlmsg_hdr(skb
));
1058 static int nf_tables_getchain(struct sock
*nlsk
, struct sk_buff
*skb
,
1059 const struct nlmsghdr
*nlh
,
1060 const struct nlattr
* const nla
[])
1062 const struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
1063 const struct nft_af_info
*afi
;
1064 const struct nft_table
*table
;
1065 const struct nft_chain
*chain
;
1066 struct sk_buff
*skb2
;
1067 struct net
*net
= sock_net(skb
->sk
);
1068 int family
= nfmsg
->nfgen_family
;
1071 if (nlh
->nlmsg_flags
& NLM_F_DUMP
) {
1072 struct netlink_dump_control c
= {
1073 .dump
= nf_tables_dump_chains
,
1075 return netlink_dump_start(nlsk
, skb
, nlh
, &c
);
1078 afi
= nf_tables_afinfo_lookup(net
, family
, false);
1080 return PTR_ERR(afi
);
1082 table
= nf_tables_table_lookup(afi
, nla
[NFTA_CHAIN_TABLE
]);
1084 return PTR_ERR(table
);
1085 if (table
->flags
& NFT_TABLE_INACTIVE
)
1088 chain
= nf_tables_chain_lookup(table
, nla
[NFTA_CHAIN_NAME
]);
1090 return PTR_ERR(chain
);
1091 if (chain
->flags
& NFT_CHAIN_INACTIVE
)
1094 skb2
= alloc_skb(NLMSG_GOODSIZE
, GFP_KERNEL
);
1098 err
= nf_tables_fill_chain_info(skb2
, net
, NETLINK_CB(skb
).portid
,
1099 nlh
->nlmsg_seq
, NFT_MSG_NEWCHAIN
, 0,
1100 family
, table
, chain
);
1104 return nlmsg_unicast(nlsk
, skb2
, NETLINK_CB(skb
).portid
);
1111 static const struct nla_policy nft_counter_policy
[NFTA_COUNTER_MAX
+ 1] = {
1112 [NFTA_COUNTER_PACKETS
] = { .type
= NLA_U64
},
1113 [NFTA_COUNTER_BYTES
] = { .type
= NLA_U64
},
1116 static struct nft_stats __percpu
*nft_stats_alloc(const struct nlattr
*attr
)
1118 struct nlattr
*tb
[NFTA_COUNTER_MAX
+1];
1119 struct nft_stats __percpu
*newstats
;
1120 struct nft_stats
*stats
;
1123 err
= nla_parse_nested(tb
, NFTA_COUNTER_MAX
, attr
, nft_counter_policy
);
1125 return ERR_PTR(err
);
1127 if (!tb
[NFTA_COUNTER_BYTES
] || !tb
[NFTA_COUNTER_PACKETS
])
1128 return ERR_PTR(-EINVAL
);
1130 newstats
= netdev_alloc_pcpu_stats(struct nft_stats
);
1131 if (newstats
== NULL
)
1132 return ERR_PTR(-ENOMEM
);
1134 /* Restore old counters on this cpu, no problem. Per-cpu statistics
1135 * are not exposed to userspace.
1137 stats
= this_cpu_ptr(newstats
);
1138 stats
->bytes
= be64_to_cpu(nla_get_be64(tb
[NFTA_COUNTER_BYTES
]));
1139 stats
->pkts
= be64_to_cpu(nla_get_be64(tb
[NFTA_COUNTER_PACKETS
]));
1144 static void nft_chain_stats_replace(struct nft_base_chain
*chain
,
1145 struct nft_stats __percpu
*newstats
)
1147 if (newstats
== NULL
)
1151 struct nft_stats __percpu
*oldstats
=
1152 nft_dereference(chain
->stats
);
1154 rcu_assign_pointer(chain
->stats
, newstats
);
1156 free_percpu(oldstats
);
1158 rcu_assign_pointer(chain
->stats
, newstats
);
1161 static void nf_tables_chain_destroy(struct nft_chain
*chain
)
1163 BUG_ON(chain
->use
> 0);
1165 if (chain
->flags
& NFT_BASE_CHAIN
) {
1166 module_put(nft_base_chain(chain
)->type
->owner
);
1167 free_percpu(nft_base_chain(chain
)->stats
);
1168 kfree(nft_base_chain(chain
));
1174 static int nf_tables_newchain(struct sock
*nlsk
, struct sk_buff
*skb
,
1175 const struct nlmsghdr
*nlh
,
1176 const struct nlattr
* const nla
[])
1178 const struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
1179 const struct nlattr
* uninitialized_var(name
);
1180 struct nft_af_info
*afi
;
1181 struct nft_table
*table
;
1182 struct nft_chain
*chain
;
1183 struct nft_base_chain
*basechain
= NULL
;
1184 struct nlattr
*ha
[NFTA_HOOK_MAX
+ 1];
1185 struct net
*net
= sock_net(skb
->sk
);
1186 int family
= nfmsg
->nfgen_family
;
1187 u8 policy
= NF_ACCEPT
;
1190 struct nft_stats __percpu
*stats
;
1195 create
= nlh
->nlmsg_flags
& NLM_F_CREATE
? true : false;
1197 afi
= nf_tables_afinfo_lookup(net
, family
, true);
1199 return PTR_ERR(afi
);
1201 table
= nf_tables_table_lookup(afi
, nla
[NFTA_CHAIN_TABLE
]);
1203 return PTR_ERR(table
);
1206 name
= nla
[NFTA_CHAIN_NAME
];
1208 if (nla
[NFTA_CHAIN_HANDLE
]) {
1209 handle
= be64_to_cpu(nla_get_be64(nla
[NFTA_CHAIN_HANDLE
]));
1210 chain
= nf_tables_chain_lookup_byhandle(table
, handle
);
1212 return PTR_ERR(chain
);
1214 chain
= nf_tables_chain_lookup(table
, name
);
1215 if (IS_ERR(chain
)) {
1216 if (PTR_ERR(chain
) != -ENOENT
)
1217 return PTR_ERR(chain
);
1222 if (nla
[NFTA_CHAIN_POLICY
]) {
1223 if ((chain
!= NULL
&&
1224 !(chain
->flags
& NFT_BASE_CHAIN
)) ||
1225 nla
[NFTA_CHAIN_HOOK
] == NULL
)
1228 policy
= ntohl(nla_get_be32(nla
[NFTA_CHAIN_POLICY
]));
1238 if (chain
!= NULL
) {
1239 struct nft_stats
*stats
= NULL
;
1240 struct nft_trans
*trans
;
1242 if (chain
->flags
& NFT_CHAIN_INACTIVE
)
1244 if (nlh
->nlmsg_flags
& NLM_F_EXCL
)
1246 if (nlh
->nlmsg_flags
& NLM_F_REPLACE
)
1249 if (nla
[NFTA_CHAIN_HANDLE
] && name
&&
1250 !IS_ERR(nf_tables_chain_lookup(table
, nla
[NFTA_CHAIN_NAME
])))
1253 if (nla
[NFTA_CHAIN_COUNTERS
]) {
1254 if (!(chain
->flags
& NFT_BASE_CHAIN
))
1257 stats
= nft_stats_alloc(nla
[NFTA_CHAIN_COUNTERS
]);
1259 return PTR_ERR(stats
);
1262 nft_ctx_init(&ctx
, skb
, nlh
, afi
, table
, chain
, nla
);
1263 trans
= nft_trans_alloc(&ctx
, NFT_MSG_NEWCHAIN
,
1264 sizeof(struct nft_trans_chain
));
1268 nft_trans_chain_stats(trans
) = stats
;
1269 nft_trans_chain_update(trans
) = true;
1271 if (nla
[NFTA_CHAIN_POLICY
])
1272 nft_trans_chain_policy(trans
) = policy
;
1274 nft_trans_chain_policy(trans
) = -1;
1276 if (nla
[NFTA_CHAIN_HANDLE
] && name
) {
1277 nla_strlcpy(nft_trans_chain_name(trans
), name
,
1278 NFT_CHAIN_MAXNAMELEN
);
1280 list_add_tail(&trans
->list
, &net
->nft
.commit_list
);
1284 if (table
->use
== UINT_MAX
)
1287 if (nla
[NFTA_CHAIN_HOOK
]) {
1288 const struct nf_chain_type
*type
;
1289 struct nf_hook_ops
*ops
;
1291 u32 hooknum
, priority
;
1293 type
= chain_type
[family
][NFT_CHAIN_T_DEFAULT
];
1294 if (nla
[NFTA_CHAIN_TYPE
]) {
1295 type
= nf_tables_chain_type_lookup(afi
,
1296 nla
[NFTA_CHAIN_TYPE
],
1299 return PTR_ERR(type
);
1302 err
= nla_parse_nested(ha
, NFTA_HOOK_MAX
, nla
[NFTA_CHAIN_HOOK
],
1306 if (ha
[NFTA_HOOK_HOOKNUM
] == NULL
||
1307 ha
[NFTA_HOOK_PRIORITY
] == NULL
)
1310 hooknum
= ntohl(nla_get_be32(ha
[NFTA_HOOK_HOOKNUM
]));
1311 if (hooknum
>= afi
->nhooks
)
1313 priority
= ntohl(nla_get_be32(ha
[NFTA_HOOK_PRIORITY
]));
1315 if (!(type
->hook_mask
& (1 << hooknum
)))
1317 if (!try_module_get(type
->owner
))
1319 hookfn
= type
->hooks
[hooknum
];
1321 basechain
= kzalloc(sizeof(*basechain
), GFP_KERNEL
);
1322 if (basechain
== NULL
)
1325 if (nla
[NFTA_CHAIN_COUNTERS
]) {
1326 stats
= nft_stats_alloc(nla
[NFTA_CHAIN_COUNTERS
]);
1327 if (IS_ERR(stats
)) {
1328 module_put(type
->owner
);
1330 return PTR_ERR(stats
);
1332 basechain
->stats
= stats
;
1334 stats
= netdev_alloc_pcpu_stats(struct nft_stats
);
1335 if (stats
== NULL
) {
1336 module_put(type
->owner
);
1340 rcu_assign_pointer(basechain
->stats
, stats
);
1343 basechain
->type
= type
;
1344 chain
= &basechain
->chain
;
1346 for (i
= 0; i
< afi
->nops
; i
++) {
1347 ops
= &basechain
->ops
[i
];
1349 ops
->owner
= afi
->owner
;
1350 ops
->hooknum
= hooknum
;
1351 ops
->priority
= priority
;
1353 ops
->hook
= afi
->hooks
[ops
->hooknum
];
1356 if (afi
->hook_ops_init
)
1357 afi
->hook_ops_init(ops
, i
);
1360 chain
->flags
|= NFT_BASE_CHAIN
;
1361 basechain
->policy
= policy
;
1363 chain
= kzalloc(sizeof(*chain
), GFP_KERNEL
);
1368 INIT_LIST_HEAD(&chain
->rules
);
1369 chain
->handle
= nf_tables_alloc_handle(table
);
1371 chain
->table
= table
;
1372 nla_strlcpy(chain
->name
, name
, NFT_CHAIN_MAXNAMELEN
);
1374 if (!(table
->flags
& NFT_TABLE_F_DORMANT
) &&
1375 chain
->flags
& NFT_BASE_CHAIN
) {
1376 err
= nf_register_hooks(nft_base_chain(chain
)->ops
, afi
->nops
);
1381 nft_ctx_init(&ctx
, skb
, nlh
, afi
, table
, chain
, nla
);
1382 err
= nft_trans_chain_add(&ctx
, NFT_MSG_NEWCHAIN
);
1387 list_add_tail_rcu(&chain
->list
, &table
->chains
);
1390 nf_tables_unregister_hooks(table
, chain
, afi
->nops
);
1392 nf_tables_chain_destroy(chain
);
1396 static int nf_tables_delchain(struct sock
*nlsk
, struct sk_buff
*skb
,
1397 const struct nlmsghdr
*nlh
,
1398 const struct nlattr
* const nla
[])
1400 const struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
1401 struct nft_af_info
*afi
;
1402 struct nft_table
*table
;
1403 struct nft_chain
*chain
;
1404 struct net
*net
= sock_net(skb
->sk
);
1405 int family
= nfmsg
->nfgen_family
;
1408 afi
= nf_tables_afinfo_lookup(net
, family
, false);
1410 return PTR_ERR(afi
);
1412 table
= nf_tables_table_lookup(afi
, nla
[NFTA_CHAIN_TABLE
]);
1414 return PTR_ERR(table
);
1415 if (table
->flags
& NFT_TABLE_INACTIVE
)
1418 chain
= nf_tables_chain_lookup(table
, nla
[NFTA_CHAIN_NAME
]);
1420 return PTR_ERR(chain
);
1421 if (chain
->flags
& NFT_CHAIN_INACTIVE
)
1426 nft_ctx_init(&ctx
, skb
, nlh
, afi
, table
, chain
, nla
);
1428 return nft_delchain(&ctx
);
1436 * nft_register_expr - register nf_tables expr type
1439 * Registers the expr type for use with nf_tables. Returns zero on
1440 * success or a negative errno code otherwise.
1442 int nft_register_expr(struct nft_expr_type
*type
)
1444 nfnl_lock(NFNL_SUBSYS_NFTABLES
);
1445 if (type
->family
== NFPROTO_UNSPEC
)
1446 list_add_tail_rcu(&type
->list
, &nf_tables_expressions
);
1448 list_add_rcu(&type
->list
, &nf_tables_expressions
);
1449 nfnl_unlock(NFNL_SUBSYS_NFTABLES
);
1452 EXPORT_SYMBOL_GPL(nft_register_expr
);
1455 * nft_unregister_expr - unregister nf_tables expr type
1458 * Unregisters the expr typefor use with nf_tables.
1460 void nft_unregister_expr(struct nft_expr_type
*type
)
1462 nfnl_lock(NFNL_SUBSYS_NFTABLES
);
1463 list_del_rcu(&type
->list
);
1464 nfnl_unlock(NFNL_SUBSYS_NFTABLES
);
1466 EXPORT_SYMBOL_GPL(nft_unregister_expr
);
1468 static const struct nft_expr_type
*__nft_expr_type_get(u8 family
,
1471 const struct nft_expr_type
*type
;
1473 list_for_each_entry(type
, &nf_tables_expressions
, list
) {
1474 if (!nla_strcmp(nla
, type
->name
) &&
1475 (!type
->family
|| type
->family
== family
))
1481 static const struct nft_expr_type
*nft_expr_type_get(u8 family
,
1484 const struct nft_expr_type
*type
;
1487 return ERR_PTR(-EINVAL
);
1489 type
= __nft_expr_type_get(family
, nla
);
1490 if (type
!= NULL
&& try_module_get(type
->owner
))
1493 #ifdef CONFIG_MODULES
1495 nfnl_unlock(NFNL_SUBSYS_NFTABLES
);
1496 request_module("nft-expr-%u-%.*s", family
,
1497 nla_len(nla
), (char *)nla_data(nla
));
1498 nfnl_lock(NFNL_SUBSYS_NFTABLES
);
1499 if (__nft_expr_type_get(family
, nla
))
1500 return ERR_PTR(-EAGAIN
);
1502 nfnl_unlock(NFNL_SUBSYS_NFTABLES
);
1503 request_module("nft-expr-%.*s",
1504 nla_len(nla
), (char *)nla_data(nla
));
1505 nfnl_lock(NFNL_SUBSYS_NFTABLES
);
1506 if (__nft_expr_type_get(family
, nla
))
1507 return ERR_PTR(-EAGAIN
);
1510 return ERR_PTR(-ENOENT
);
1513 static const struct nla_policy nft_expr_policy
[NFTA_EXPR_MAX
+ 1] = {
1514 [NFTA_EXPR_NAME
] = { .type
= NLA_STRING
},
1515 [NFTA_EXPR_DATA
] = { .type
= NLA_NESTED
},
1518 static int nf_tables_fill_expr_info(struct sk_buff
*skb
,
1519 const struct nft_expr
*expr
)
1521 if (nla_put_string(skb
, NFTA_EXPR_NAME
, expr
->ops
->type
->name
))
1522 goto nla_put_failure
;
1524 if (expr
->ops
->dump
) {
1525 struct nlattr
*data
= nla_nest_start(skb
, NFTA_EXPR_DATA
);
1527 goto nla_put_failure
;
1528 if (expr
->ops
->dump(skb
, expr
) < 0)
1529 goto nla_put_failure
;
1530 nla_nest_end(skb
, data
);
1539 struct nft_expr_info
{
1540 const struct nft_expr_ops
*ops
;
1541 struct nlattr
*tb
[NFT_EXPR_MAXATTR
+ 1];
1544 static int nf_tables_expr_parse(const struct nft_ctx
*ctx
,
1545 const struct nlattr
*nla
,
1546 struct nft_expr_info
*info
)
1548 const struct nft_expr_type
*type
;
1549 const struct nft_expr_ops
*ops
;
1550 struct nlattr
*tb
[NFTA_EXPR_MAX
+ 1];
1553 err
= nla_parse_nested(tb
, NFTA_EXPR_MAX
, nla
, nft_expr_policy
);
1557 type
= nft_expr_type_get(ctx
->afi
->family
, tb
[NFTA_EXPR_NAME
]);
1559 return PTR_ERR(type
);
1561 if (tb
[NFTA_EXPR_DATA
]) {
1562 err
= nla_parse_nested(info
->tb
, type
->maxattr
,
1563 tb
[NFTA_EXPR_DATA
], type
->policy
);
1567 memset(info
->tb
, 0, sizeof(info
->tb
[0]) * (type
->maxattr
+ 1));
1569 if (type
->select_ops
!= NULL
) {
1570 ops
= type
->select_ops(ctx
,
1571 (const struct nlattr
* const *)info
->tb
);
1583 module_put(type
->owner
);
1587 static int nf_tables_newexpr(const struct nft_ctx
*ctx
,
1588 const struct nft_expr_info
*info
,
1589 struct nft_expr
*expr
)
1591 const struct nft_expr_ops
*ops
= info
->ops
;
1596 err
= ops
->init(ctx
, expr
, (const struct nlattr
**)info
->tb
);
1608 static void nf_tables_expr_destroy(const struct nft_ctx
*ctx
,
1609 struct nft_expr
*expr
)
1611 if (expr
->ops
->destroy
)
1612 expr
->ops
->destroy(ctx
, expr
);
1613 module_put(expr
->ops
->type
->owner
);
1620 static struct nft_rule
*__nf_tables_rule_lookup(const struct nft_chain
*chain
,
1623 struct nft_rule
*rule
;
1625 // FIXME: this sucks
1626 list_for_each_entry(rule
, &chain
->rules
, list
) {
1627 if (handle
== rule
->handle
)
1631 return ERR_PTR(-ENOENT
);
1634 static struct nft_rule
*nf_tables_rule_lookup(const struct nft_chain
*chain
,
1635 const struct nlattr
*nla
)
1638 return ERR_PTR(-EINVAL
);
1640 return __nf_tables_rule_lookup(chain
, be64_to_cpu(nla_get_be64(nla
)));
1643 static const struct nla_policy nft_rule_policy
[NFTA_RULE_MAX
+ 1] = {
1644 [NFTA_RULE_TABLE
] = { .type
= NLA_STRING
},
1645 [NFTA_RULE_CHAIN
] = { .type
= NLA_STRING
,
1646 .len
= NFT_CHAIN_MAXNAMELEN
- 1 },
1647 [NFTA_RULE_HANDLE
] = { .type
= NLA_U64
},
1648 [NFTA_RULE_EXPRESSIONS
] = { .type
= NLA_NESTED
},
1649 [NFTA_RULE_COMPAT
] = { .type
= NLA_NESTED
},
1650 [NFTA_RULE_POSITION
] = { .type
= NLA_U64
},
1651 [NFTA_RULE_USERDATA
] = { .type
= NLA_BINARY
,
1652 .len
= NFT_USERDATA_MAXLEN
},
1655 static int nf_tables_fill_rule_info(struct sk_buff
*skb
, struct net
*net
,
1656 u32 portid
, u32 seq
, int event
,
1657 u32 flags
, int family
,
1658 const struct nft_table
*table
,
1659 const struct nft_chain
*chain
,
1660 const struct nft_rule
*rule
)
1662 struct nlmsghdr
*nlh
;
1663 struct nfgenmsg
*nfmsg
;
1664 const struct nft_expr
*expr
, *next
;
1665 struct nlattr
*list
;
1666 const struct nft_rule
*prule
;
1667 int type
= event
| NFNL_SUBSYS_NFTABLES
<< 8;
1669 nlh
= nlmsg_put(skb
, portid
, seq
, type
, sizeof(struct nfgenmsg
),
1672 goto nla_put_failure
;
1674 nfmsg
= nlmsg_data(nlh
);
1675 nfmsg
->nfgen_family
= family
;
1676 nfmsg
->version
= NFNETLINK_V0
;
1677 nfmsg
->res_id
= htons(net
->nft
.base_seq
& 0xffff);
1679 if (nla_put_string(skb
, NFTA_RULE_TABLE
, table
->name
))
1680 goto nla_put_failure
;
1681 if (nla_put_string(skb
, NFTA_RULE_CHAIN
, chain
->name
))
1682 goto nla_put_failure
;
1683 if (nla_put_be64(skb
, NFTA_RULE_HANDLE
, cpu_to_be64(rule
->handle
)))
1684 goto nla_put_failure
;
1686 if ((event
!= NFT_MSG_DELRULE
) && (rule
->list
.prev
!= &chain
->rules
)) {
1687 prule
= list_entry(rule
->list
.prev
, struct nft_rule
, list
);
1688 if (nla_put_be64(skb
, NFTA_RULE_POSITION
,
1689 cpu_to_be64(prule
->handle
)))
1690 goto nla_put_failure
;
1693 list
= nla_nest_start(skb
, NFTA_RULE_EXPRESSIONS
);
1695 goto nla_put_failure
;
1696 nft_rule_for_each_expr(expr
, next
, rule
) {
1697 struct nlattr
*elem
= nla_nest_start(skb
, NFTA_LIST_ELEM
);
1699 goto nla_put_failure
;
1700 if (nf_tables_fill_expr_info(skb
, expr
) < 0)
1701 goto nla_put_failure
;
1702 nla_nest_end(skb
, elem
);
1704 nla_nest_end(skb
, list
);
1707 nla_put(skb
, NFTA_RULE_USERDATA
, rule
->ulen
, nft_userdata(rule
)))
1708 goto nla_put_failure
;
1710 return nlmsg_end(skb
, nlh
);
1713 nlmsg_trim(skb
, nlh
);
1717 static int nf_tables_rule_notify(const struct nft_ctx
*ctx
,
1718 const struct nft_rule
*rule
,
1721 struct sk_buff
*skb
;
1725 !nfnetlink_has_listeners(ctx
->net
, NFNLGRP_NFTABLES
))
1729 skb
= nlmsg_new(NLMSG_GOODSIZE
, GFP_KERNEL
);
1733 err
= nf_tables_fill_rule_info(skb
, ctx
->net
, ctx
->portid
, ctx
->seq
,
1734 event
, 0, ctx
->afi
->family
, ctx
->table
,
1741 err
= nfnetlink_send(skb
, ctx
->net
, ctx
->portid
, NFNLGRP_NFTABLES
,
1742 ctx
->report
, GFP_KERNEL
);
1745 nfnetlink_set_err(ctx
->net
, ctx
->portid
, NFNLGRP_NFTABLES
,
1751 static int nf_tables_dump_rules(struct sk_buff
*skb
,
1752 struct netlink_callback
*cb
)
1754 const struct nfgenmsg
*nfmsg
= nlmsg_data(cb
->nlh
);
1755 const struct nft_af_info
*afi
;
1756 const struct nft_table
*table
;
1757 const struct nft_chain
*chain
;
1758 const struct nft_rule
*rule
;
1759 unsigned int idx
= 0, s_idx
= cb
->args
[0];
1760 struct net
*net
= sock_net(skb
->sk
);
1761 int family
= nfmsg
->nfgen_family
;
1764 cb
->seq
= net
->nft
.base_seq
;
1766 list_for_each_entry_rcu(afi
, &net
->nft
.af_info
, list
) {
1767 if (family
!= NFPROTO_UNSPEC
&& family
!= afi
->family
)
1770 list_for_each_entry_rcu(table
, &afi
->tables
, list
) {
1771 list_for_each_entry_rcu(chain
, &table
->chains
, list
) {
1772 list_for_each_entry_rcu(rule
, &chain
->rules
, list
) {
1773 if (!nft_rule_is_active(net
, rule
))
1778 memset(&cb
->args
[1], 0,
1779 sizeof(cb
->args
) - sizeof(cb
->args
[0]));
1780 if (nf_tables_fill_rule_info(skb
, net
, NETLINK_CB(cb
->skb
).portid
,
1783 NLM_F_MULTI
| NLM_F_APPEND
,
1784 afi
->family
, table
, chain
, rule
) < 0)
1787 nl_dump_check_consistent(cb
, nlmsg_hdr(skb
));
1801 static int nf_tables_getrule(struct sock
*nlsk
, struct sk_buff
*skb
,
1802 const struct nlmsghdr
*nlh
,
1803 const struct nlattr
* const nla
[])
1805 const struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
1806 const struct nft_af_info
*afi
;
1807 const struct nft_table
*table
;
1808 const struct nft_chain
*chain
;
1809 const struct nft_rule
*rule
;
1810 struct sk_buff
*skb2
;
1811 struct net
*net
= sock_net(skb
->sk
);
1812 int family
= nfmsg
->nfgen_family
;
1815 if (nlh
->nlmsg_flags
& NLM_F_DUMP
) {
1816 struct netlink_dump_control c
= {
1817 .dump
= nf_tables_dump_rules
,
1819 return netlink_dump_start(nlsk
, skb
, nlh
, &c
);
1822 afi
= nf_tables_afinfo_lookup(net
, family
, false);
1824 return PTR_ERR(afi
);
1826 table
= nf_tables_table_lookup(afi
, nla
[NFTA_RULE_TABLE
]);
1828 return PTR_ERR(table
);
1829 if (table
->flags
& NFT_TABLE_INACTIVE
)
1832 chain
= nf_tables_chain_lookup(table
, nla
[NFTA_RULE_CHAIN
]);
1834 return PTR_ERR(chain
);
1835 if (chain
->flags
& NFT_CHAIN_INACTIVE
)
1838 rule
= nf_tables_rule_lookup(chain
, nla
[NFTA_RULE_HANDLE
]);
1840 return PTR_ERR(rule
);
1842 skb2
= alloc_skb(NLMSG_GOODSIZE
, GFP_KERNEL
);
1846 err
= nf_tables_fill_rule_info(skb2
, net
, NETLINK_CB(skb
).portid
,
1847 nlh
->nlmsg_seq
, NFT_MSG_NEWRULE
, 0,
1848 family
, table
, chain
, rule
);
1852 return nlmsg_unicast(nlsk
, skb2
, NETLINK_CB(skb
).portid
);
1859 static void nf_tables_rule_destroy(const struct nft_ctx
*ctx
,
1860 struct nft_rule
*rule
)
1862 struct nft_expr
*expr
;
1865 * Careful: some expressions might not be initialized in case this
1866 * is called on error from nf_tables_newrule().
1868 expr
= nft_expr_first(rule
);
1869 while (expr
->ops
&& expr
!= nft_expr_last(rule
)) {
1870 nf_tables_expr_destroy(ctx
, expr
);
1871 expr
= nft_expr_next(expr
);
1876 #define NFT_RULE_MAXEXPRS 128
1878 static struct nft_expr_info
*info
;
1880 static int nf_tables_newrule(struct sock
*nlsk
, struct sk_buff
*skb
,
1881 const struct nlmsghdr
*nlh
,
1882 const struct nlattr
* const nla
[])
1884 const struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
1885 struct nft_af_info
*afi
;
1886 struct net
*net
= sock_net(skb
->sk
);
1887 struct nft_table
*table
;
1888 struct nft_chain
*chain
;
1889 struct nft_rule
*rule
, *old_rule
= NULL
;
1890 struct nft_trans
*trans
= NULL
;
1891 struct nft_expr
*expr
;
1894 unsigned int size
, i
, n
, ulen
= 0;
1897 u64 handle
, pos_handle
;
1899 create
= nlh
->nlmsg_flags
& NLM_F_CREATE
? true : false;
1901 afi
= nf_tables_afinfo_lookup(net
, nfmsg
->nfgen_family
, create
);
1903 return PTR_ERR(afi
);
1905 table
= nf_tables_table_lookup(afi
, nla
[NFTA_RULE_TABLE
]);
1907 return PTR_ERR(table
);
1909 chain
= nf_tables_chain_lookup(table
, nla
[NFTA_RULE_CHAIN
]);
1911 return PTR_ERR(chain
);
1913 if (nla
[NFTA_RULE_HANDLE
]) {
1914 handle
= be64_to_cpu(nla_get_be64(nla
[NFTA_RULE_HANDLE
]));
1915 rule
= __nf_tables_rule_lookup(chain
, handle
);
1917 return PTR_ERR(rule
);
1919 if (nlh
->nlmsg_flags
& NLM_F_EXCL
)
1921 if (nlh
->nlmsg_flags
& NLM_F_REPLACE
)
1926 if (!create
|| nlh
->nlmsg_flags
& NLM_F_REPLACE
)
1928 handle
= nf_tables_alloc_handle(table
);
1930 if (chain
->use
== UINT_MAX
)
1934 if (nla
[NFTA_RULE_POSITION
]) {
1935 if (!(nlh
->nlmsg_flags
& NLM_F_CREATE
))
1938 pos_handle
= be64_to_cpu(nla_get_be64(nla
[NFTA_RULE_POSITION
]));
1939 old_rule
= __nf_tables_rule_lookup(chain
, pos_handle
);
1940 if (IS_ERR(old_rule
))
1941 return PTR_ERR(old_rule
);
1944 nft_ctx_init(&ctx
, skb
, nlh
, afi
, table
, chain
, nla
);
1948 if (nla
[NFTA_RULE_EXPRESSIONS
]) {
1949 nla_for_each_nested(tmp
, nla
[NFTA_RULE_EXPRESSIONS
], rem
) {
1951 if (nla_type(tmp
) != NFTA_LIST_ELEM
)
1953 if (n
== NFT_RULE_MAXEXPRS
)
1955 err
= nf_tables_expr_parse(&ctx
, tmp
, &info
[n
]);
1958 size
+= info
[n
].ops
->size
;
1963 if (nla
[NFTA_RULE_USERDATA
])
1964 ulen
= nla_len(nla
[NFTA_RULE_USERDATA
]);
1967 rule
= kzalloc(sizeof(*rule
) + size
+ ulen
, GFP_KERNEL
);
1971 nft_rule_activate_next(net
, rule
);
1973 rule
->handle
= handle
;
1978 nla_memcpy(nft_userdata(rule
), nla
[NFTA_RULE_USERDATA
], ulen
);
1980 expr
= nft_expr_first(rule
);
1981 for (i
= 0; i
< n
; i
++) {
1982 err
= nf_tables_newexpr(&ctx
, &info
[i
], expr
);
1986 expr
= nft_expr_next(expr
);
1989 if (nlh
->nlmsg_flags
& NLM_F_REPLACE
) {
1990 if (nft_rule_is_active_next(net
, old_rule
)) {
1991 trans
= nft_trans_rule_add(&ctx
, NFT_MSG_DELRULE
,
1993 if (trans
== NULL
) {
1997 nft_rule_deactivate_next(net
, old_rule
);
1999 list_add_tail_rcu(&rule
->list
, &old_rule
->list
);
2004 } else if (nlh
->nlmsg_flags
& NLM_F_APPEND
)
2006 list_add_rcu(&rule
->list
, &old_rule
->list
);
2008 list_add_tail_rcu(&rule
->list
, &chain
->rules
);
2011 list_add_tail_rcu(&rule
->list
, &old_rule
->list
);
2013 list_add_rcu(&rule
->list
, &chain
->rules
);
2016 if (nft_trans_rule_add(&ctx
, NFT_MSG_NEWRULE
, rule
) == NULL
) {
2024 list_del_rcu(&rule
->list
);
2026 list_del_rcu(&nft_trans_rule(trans
)->list
);
2027 nft_rule_clear(net
, nft_trans_rule(trans
));
2028 nft_trans_destroy(trans
);
2032 nf_tables_rule_destroy(&ctx
, rule
);
2034 for (i
= 0; i
< n
; i
++) {
2035 if (info
[i
].ops
!= NULL
)
2036 module_put(info
[i
].ops
->type
->owner
);
2041 static int nf_tables_delrule(struct sock
*nlsk
, struct sk_buff
*skb
,
2042 const struct nlmsghdr
*nlh
,
2043 const struct nlattr
* const nla
[])
2045 const struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
2046 struct nft_af_info
*afi
;
2047 struct net
*net
= sock_net(skb
->sk
);
2048 struct nft_table
*table
;
2049 struct nft_chain
*chain
= NULL
;
2050 struct nft_rule
*rule
;
2051 int family
= nfmsg
->nfgen_family
, err
= 0;
2054 afi
= nf_tables_afinfo_lookup(net
, family
, false);
2056 return PTR_ERR(afi
);
2058 table
= nf_tables_table_lookup(afi
, nla
[NFTA_RULE_TABLE
]);
2060 return PTR_ERR(table
);
2061 if (table
->flags
& NFT_TABLE_INACTIVE
)
2064 if (nla
[NFTA_RULE_CHAIN
]) {
2065 chain
= nf_tables_chain_lookup(table
, nla
[NFTA_RULE_CHAIN
]);
2067 return PTR_ERR(chain
);
2070 nft_ctx_init(&ctx
, skb
, nlh
, afi
, table
, chain
, nla
);
2073 if (nla
[NFTA_RULE_HANDLE
]) {
2074 rule
= nf_tables_rule_lookup(chain
,
2075 nla
[NFTA_RULE_HANDLE
]);
2077 return PTR_ERR(rule
);
2079 err
= nft_delrule(&ctx
, rule
);
2081 err
= nft_delrule_by_chain(&ctx
);
2084 list_for_each_entry(chain
, &table
->chains
, list
) {
2086 err
= nft_delrule_by_chain(&ctx
);
2099 static LIST_HEAD(nf_tables_set_ops
);
2101 int nft_register_set(struct nft_set_ops
*ops
)
2103 nfnl_lock(NFNL_SUBSYS_NFTABLES
);
2104 list_add_tail_rcu(&ops
->list
, &nf_tables_set_ops
);
2105 nfnl_unlock(NFNL_SUBSYS_NFTABLES
);
2108 EXPORT_SYMBOL_GPL(nft_register_set
);
2110 void nft_unregister_set(struct nft_set_ops
*ops
)
2112 nfnl_lock(NFNL_SUBSYS_NFTABLES
);
2113 list_del_rcu(&ops
->list
);
2114 nfnl_unlock(NFNL_SUBSYS_NFTABLES
);
2116 EXPORT_SYMBOL_GPL(nft_unregister_set
);
2119 * Select a set implementation based on the data characteristics and the
2120 * given policy. The total memory use might not be known if no size is
2121 * given, in that case the amount of memory per element is used.
2123 static const struct nft_set_ops
*
2124 nft_select_set_ops(const struct nlattr
* const nla
[],
2125 const struct nft_set_desc
*desc
,
2126 enum nft_set_policies policy
)
2128 const struct nft_set_ops
*ops
, *bops
;
2129 struct nft_set_estimate est
, best
;
2132 #ifdef CONFIG_MODULES
2133 if (list_empty(&nf_tables_set_ops
)) {
2134 nfnl_unlock(NFNL_SUBSYS_NFTABLES
);
2135 request_module("nft-set");
2136 nfnl_lock(NFNL_SUBSYS_NFTABLES
);
2137 if (!list_empty(&nf_tables_set_ops
))
2138 return ERR_PTR(-EAGAIN
);
2142 if (nla
[NFTA_SET_FLAGS
] != NULL
) {
2143 features
= ntohl(nla_get_be32(nla
[NFTA_SET_FLAGS
]));
2144 features
&= NFT_SET_INTERVAL
| NFT_SET_MAP
;
2151 list_for_each_entry(ops
, &nf_tables_set_ops
, list
) {
2152 if ((ops
->features
& features
) != features
)
2154 if (!ops
->estimate(desc
, features
, &est
))
2158 case NFT_SET_POL_PERFORMANCE
:
2159 if (est
.class < best
.class)
2161 if (est
.class == best
.class && est
.size
< best
.size
)
2164 case NFT_SET_POL_MEMORY
:
2165 if (est
.size
< best
.size
)
2167 if (est
.size
== best
.size
&& est
.class < best
.class)
2174 if (!try_module_get(ops
->owner
))
2177 module_put(bops
->owner
);
2186 return ERR_PTR(-EOPNOTSUPP
);
2189 static const struct nla_policy nft_set_policy
[NFTA_SET_MAX
+ 1] = {
2190 [NFTA_SET_TABLE
] = { .type
= NLA_STRING
},
2191 [NFTA_SET_NAME
] = { .type
= NLA_STRING
,
2192 .len
= IFNAMSIZ
- 1 },
2193 [NFTA_SET_FLAGS
] = { .type
= NLA_U32
},
2194 [NFTA_SET_KEY_TYPE
] = { .type
= NLA_U32
},
2195 [NFTA_SET_KEY_LEN
] = { .type
= NLA_U32
},
2196 [NFTA_SET_DATA_TYPE
] = { .type
= NLA_U32
},
2197 [NFTA_SET_DATA_LEN
] = { .type
= NLA_U32
},
2198 [NFTA_SET_POLICY
] = { .type
= NLA_U32
},
2199 [NFTA_SET_DESC
] = { .type
= NLA_NESTED
},
2200 [NFTA_SET_ID
] = { .type
= NLA_U32
},
2203 static const struct nla_policy nft_set_desc_policy
[NFTA_SET_DESC_MAX
+ 1] = {
2204 [NFTA_SET_DESC_SIZE
] = { .type
= NLA_U32
},
2207 static int nft_ctx_init_from_setattr(struct nft_ctx
*ctx
,
2208 const struct sk_buff
*skb
,
2209 const struct nlmsghdr
*nlh
,
2210 const struct nlattr
* const nla
[])
2212 struct net
*net
= sock_net(skb
->sk
);
2213 const struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
2214 struct nft_af_info
*afi
= NULL
;
2215 struct nft_table
*table
= NULL
;
2217 if (nfmsg
->nfgen_family
!= NFPROTO_UNSPEC
) {
2218 afi
= nf_tables_afinfo_lookup(net
, nfmsg
->nfgen_family
, false);
2220 return PTR_ERR(afi
);
2223 if (nla
[NFTA_SET_TABLE
] != NULL
) {
2225 return -EAFNOSUPPORT
;
2227 table
= nf_tables_table_lookup(afi
, nla
[NFTA_SET_TABLE
]);
2229 return PTR_ERR(table
);
2230 if (table
->flags
& NFT_TABLE_INACTIVE
)
2234 nft_ctx_init(ctx
, skb
, nlh
, afi
, table
, NULL
, nla
);
2238 struct nft_set
*nf_tables_set_lookup(const struct nft_table
*table
,
2239 const struct nlattr
*nla
)
2241 struct nft_set
*set
;
2244 return ERR_PTR(-EINVAL
);
2246 list_for_each_entry(set
, &table
->sets
, list
) {
2247 if (!nla_strcmp(nla
, set
->name
))
2250 return ERR_PTR(-ENOENT
);
2253 struct nft_set
*nf_tables_set_lookup_byid(const struct net
*net
,
2254 const struct nlattr
*nla
)
2256 struct nft_trans
*trans
;
2257 u32 id
= ntohl(nla_get_be32(nla
));
2259 list_for_each_entry(trans
, &net
->nft
.commit_list
, list
) {
2260 if (trans
->msg_type
== NFT_MSG_NEWSET
&&
2261 id
== nft_trans_set_id(trans
))
2262 return nft_trans_set(trans
);
2264 return ERR_PTR(-ENOENT
);
2267 static int nf_tables_set_alloc_name(struct nft_ctx
*ctx
, struct nft_set
*set
,
2270 const struct nft_set
*i
;
2272 unsigned long *inuse
;
2273 unsigned int n
= 0, min
= 0;
2275 p
= strnchr(name
, IFNAMSIZ
, '%');
2277 if (p
[1] != 'd' || strchr(p
+ 2, '%'))
2280 inuse
= (unsigned long *)get_zeroed_page(GFP_KERNEL
);
2284 list_for_each_entry(i
, &ctx
->table
->sets
, list
) {
2287 if (!sscanf(i
->name
, name
, &tmp
))
2289 if (tmp
< min
|| tmp
>= min
+ BITS_PER_BYTE
* PAGE_SIZE
)
2292 set_bit(tmp
- min
, inuse
);
2295 n
= find_first_zero_bit(inuse
, BITS_PER_BYTE
* PAGE_SIZE
);
2296 if (n
>= BITS_PER_BYTE
* PAGE_SIZE
) {
2297 min
+= BITS_PER_BYTE
* PAGE_SIZE
;
2298 memset(inuse
, 0, PAGE_SIZE
);
2301 free_page((unsigned long)inuse
);
2304 snprintf(set
->name
, sizeof(set
->name
), name
, min
+ n
);
2305 list_for_each_entry(i
, &ctx
->table
->sets
, list
) {
2306 if (!strcmp(set
->name
, i
->name
))
2312 static int nf_tables_fill_set(struct sk_buff
*skb
, const struct nft_ctx
*ctx
,
2313 const struct nft_set
*set
, u16 event
, u16 flags
)
2315 struct nfgenmsg
*nfmsg
;
2316 struct nlmsghdr
*nlh
;
2317 struct nlattr
*desc
;
2318 u32 portid
= ctx
->portid
;
2321 event
|= NFNL_SUBSYS_NFTABLES
<< 8;
2322 nlh
= nlmsg_put(skb
, portid
, seq
, event
, sizeof(struct nfgenmsg
),
2325 goto nla_put_failure
;
2327 nfmsg
= nlmsg_data(nlh
);
2328 nfmsg
->nfgen_family
= ctx
->afi
->family
;
2329 nfmsg
->version
= NFNETLINK_V0
;
2330 nfmsg
->res_id
= htons(ctx
->net
->nft
.base_seq
& 0xffff);
2332 if (nla_put_string(skb
, NFTA_SET_TABLE
, ctx
->table
->name
))
2333 goto nla_put_failure
;
2334 if (nla_put_string(skb
, NFTA_SET_NAME
, set
->name
))
2335 goto nla_put_failure
;
2336 if (set
->flags
!= 0)
2337 if (nla_put_be32(skb
, NFTA_SET_FLAGS
, htonl(set
->flags
)))
2338 goto nla_put_failure
;
2340 if (nla_put_be32(skb
, NFTA_SET_KEY_TYPE
, htonl(set
->ktype
)))
2341 goto nla_put_failure
;
2342 if (nla_put_be32(skb
, NFTA_SET_KEY_LEN
, htonl(set
->klen
)))
2343 goto nla_put_failure
;
2344 if (set
->flags
& NFT_SET_MAP
) {
2345 if (nla_put_be32(skb
, NFTA_SET_DATA_TYPE
, htonl(set
->dtype
)))
2346 goto nla_put_failure
;
2347 if (nla_put_be32(skb
, NFTA_SET_DATA_LEN
, htonl(set
->dlen
)))
2348 goto nla_put_failure
;
2351 if (set
->policy
!= NFT_SET_POL_PERFORMANCE
) {
2352 if (nla_put_be32(skb
, NFTA_SET_POLICY
, htonl(set
->policy
)))
2353 goto nla_put_failure
;
2356 desc
= nla_nest_start(skb
, NFTA_SET_DESC
);
2358 goto nla_put_failure
;
2360 nla_put_be32(skb
, NFTA_SET_DESC_SIZE
, htonl(set
->size
)))
2361 goto nla_put_failure
;
2362 nla_nest_end(skb
, desc
);
2364 return nlmsg_end(skb
, nlh
);
2367 nlmsg_trim(skb
, nlh
);
2371 static int nf_tables_set_notify(const struct nft_ctx
*ctx
,
2372 const struct nft_set
*set
,
2373 int event
, gfp_t gfp_flags
)
2375 struct sk_buff
*skb
;
2376 u32 portid
= ctx
->portid
;
2380 !nfnetlink_has_listeners(ctx
->net
, NFNLGRP_NFTABLES
))
2384 skb
= nlmsg_new(NLMSG_GOODSIZE
, gfp_flags
);
2388 err
= nf_tables_fill_set(skb
, ctx
, set
, event
, 0);
2394 err
= nfnetlink_send(skb
, ctx
->net
, portid
, NFNLGRP_NFTABLES
,
2395 ctx
->report
, gfp_flags
);
2398 nfnetlink_set_err(ctx
->net
, portid
, NFNLGRP_NFTABLES
, err
);
2402 static int nf_tables_dump_sets(struct sk_buff
*skb
, struct netlink_callback
*cb
)
2404 const struct nft_set
*set
;
2405 unsigned int idx
, s_idx
= cb
->args
[0];
2406 struct nft_af_info
*afi
;
2407 struct nft_table
*table
, *cur_table
= (struct nft_table
*)cb
->args
[2];
2408 struct net
*net
= sock_net(skb
->sk
);
2409 int cur_family
= cb
->args
[3];
2410 struct nft_ctx
*ctx
= cb
->data
, ctx_set
;
2416 cb
->seq
= net
->nft
.base_seq
;
2418 list_for_each_entry_rcu(afi
, &net
->nft
.af_info
, list
) {
2419 if (ctx
->afi
&& ctx
->afi
!= afi
)
2423 if (afi
->family
!= cur_family
)
2428 list_for_each_entry_rcu(table
, &afi
->tables
, list
) {
2429 if (ctx
->table
&& ctx
->table
!= table
)
2433 if (cur_table
!= table
)
2439 list_for_each_entry_rcu(set
, &table
->sets
, list
) {
2444 ctx_set
.table
= table
;
2446 if (nf_tables_fill_set(skb
, &ctx_set
, set
,
2450 cb
->args
[2] = (unsigned long) table
;
2451 cb
->args
[3] = afi
->family
;
2454 nl_dump_check_consistent(cb
, nlmsg_hdr(skb
));
2468 static int nf_tables_dump_sets_done(struct netlink_callback
*cb
)
2474 static int nf_tables_getset(struct sock
*nlsk
, struct sk_buff
*skb
,
2475 const struct nlmsghdr
*nlh
,
2476 const struct nlattr
* const nla
[])
2478 const struct nft_set
*set
;
2480 struct sk_buff
*skb2
;
2481 const struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
2484 /* Verify existence before starting dump */
2485 err
= nft_ctx_init_from_setattr(&ctx
, skb
, nlh
, nla
);
2489 if (nlh
->nlmsg_flags
& NLM_F_DUMP
) {
2490 struct netlink_dump_control c
= {
2491 .dump
= nf_tables_dump_sets
,
2492 .done
= nf_tables_dump_sets_done
,
2494 struct nft_ctx
*ctx_dump
;
2496 ctx_dump
= kmalloc(sizeof(*ctx_dump
), GFP_KERNEL
);
2497 if (ctx_dump
== NULL
)
2503 return netlink_dump_start(nlsk
, skb
, nlh
, &c
);
2506 /* Only accept unspec with dump */
2507 if (nfmsg
->nfgen_family
== NFPROTO_UNSPEC
)
2508 return -EAFNOSUPPORT
;
2510 set
= nf_tables_set_lookup(ctx
.table
, nla
[NFTA_SET_NAME
]);
2512 return PTR_ERR(set
);
2513 if (set
->flags
& NFT_SET_INACTIVE
)
2516 skb2
= alloc_skb(NLMSG_GOODSIZE
, GFP_KERNEL
);
2520 err
= nf_tables_fill_set(skb2
, &ctx
, set
, NFT_MSG_NEWSET
, 0);
2524 return nlmsg_unicast(nlsk
, skb2
, NETLINK_CB(skb
).portid
);
2531 static int nf_tables_set_desc_parse(const struct nft_ctx
*ctx
,
2532 struct nft_set_desc
*desc
,
2533 const struct nlattr
*nla
)
2535 struct nlattr
*da
[NFTA_SET_DESC_MAX
+ 1];
2538 err
= nla_parse_nested(da
, NFTA_SET_DESC_MAX
, nla
, nft_set_desc_policy
);
2542 if (da
[NFTA_SET_DESC_SIZE
] != NULL
)
2543 desc
->size
= ntohl(nla_get_be32(da
[NFTA_SET_DESC_SIZE
]));
2548 static int nf_tables_newset(struct sock
*nlsk
, struct sk_buff
*skb
,
2549 const struct nlmsghdr
*nlh
,
2550 const struct nlattr
* const nla
[])
2552 const struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
2553 const struct nft_set_ops
*ops
;
2554 struct nft_af_info
*afi
;
2555 struct net
*net
= sock_net(skb
->sk
);
2556 struct nft_table
*table
;
2557 struct nft_set
*set
;
2559 char name
[IFNAMSIZ
];
2562 u32 ktype
, dtype
, flags
, policy
;
2563 struct nft_set_desc desc
;
2566 if (nla
[NFTA_SET_TABLE
] == NULL
||
2567 nla
[NFTA_SET_NAME
] == NULL
||
2568 nla
[NFTA_SET_KEY_LEN
] == NULL
||
2569 nla
[NFTA_SET_ID
] == NULL
)
2572 memset(&desc
, 0, sizeof(desc
));
2574 ktype
= NFT_DATA_VALUE
;
2575 if (nla
[NFTA_SET_KEY_TYPE
] != NULL
) {
2576 ktype
= ntohl(nla_get_be32(nla
[NFTA_SET_KEY_TYPE
]));
2577 if ((ktype
& NFT_DATA_RESERVED_MASK
) == NFT_DATA_RESERVED_MASK
)
2581 desc
.klen
= ntohl(nla_get_be32(nla
[NFTA_SET_KEY_LEN
]));
2582 if (desc
.klen
== 0 || desc
.klen
> FIELD_SIZEOF(struct nft_data
, data
))
2586 if (nla
[NFTA_SET_FLAGS
] != NULL
) {
2587 flags
= ntohl(nla_get_be32(nla
[NFTA_SET_FLAGS
]));
2588 if (flags
& ~(NFT_SET_ANONYMOUS
| NFT_SET_CONSTANT
|
2589 NFT_SET_INTERVAL
| NFT_SET_MAP
))
2594 if (nla
[NFTA_SET_DATA_TYPE
] != NULL
) {
2595 if (!(flags
& NFT_SET_MAP
))
2598 dtype
= ntohl(nla_get_be32(nla
[NFTA_SET_DATA_TYPE
]));
2599 if ((dtype
& NFT_DATA_RESERVED_MASK
) == NFT_DATA_RESERVED_MASK
&&
2600 dtype
!= NFT_DATA_VERDICT
)
2603 if (dtype
!= NFT_DATA_VERDICT
) {
2604 if (nla
[NFTA_SET_DATA_LEN
] == NULL
)
2606 desc
.dlen
= ntohl(nla_get_be32(nla
[NFTA_SET_DATA_LEN
]));
2607 if (desc
.dlen
== 0 ||
2608 desc
.dlen
> FIELD_SIZEOF(struct nft_data
, data
))
2611 desc
.dlen
= sizeof(struct nft_data
);
2612 } else if (flags
& NFT_SET_MAP
)
2615 policy
= NFT_SET_POL_PERFORMANCE
;
2616 if (nla
[NFTA_SET_POLICY
] != NULL
)
2617 policy
= ntohl(nla_get_be32(nla
[NFTA_SET_POLICY
]));
2619 if (nla
[NFTA_SET_DESC
] != NULL
) {
2620 err
= nf_tables_set_desc_parse(&ctx
, &desc
, nla
[NFTA_SET_DESC
]);
2625 create
= nlh
->nlmsg_flags
& NLM_F_CREATE
? true : false;
2627 afi
= nf_tables_afinfo_lookup(net
, nfmsg
->nfgen_family
, create
);
2629 return PTR_ERR(afi
);
2631 table
= nf_tables_table_lookup(afi
, nla
[NFTA_SET_TABLE
]);
2633 return PTR_ERR(table
);
2635 nft_ctx_init(&ctx
, skb
, nlh
, afi
, table
, NULL
, nla
);
2637 set
= nf_tables_set_lookup(table
, nla
[NFTA_SET_NAME
]);
2639 if (PTR_ERR(set
) != -ENOENT
)
2640 return PTR_ERR(set
);
2645 if (nlh
->nlmsg_flags
& NLM_F_EXCL
)
2647 if (nlh
->nlmsg_flags
& NLM_F_REPLACE
)
2652 if (!(nlh
->nlmsg_flags
& NLM_F_CREATE
))
2655 ops
= nft_select_set_ops(nla
, &desc
, policy
);
2657 return PTR_ERR(ops
);
2660 if (ops
->privsize
!= NULL
)
2661 size
= ops
->privsize(nla
);
2664 set
= kzalloc(sizeof(*set
) + size
, GFP_KERNEL
);
2668 nla_strlcpy(name
, nla
[NFTA_SET_NAME
], sizeof(set
->name
));
2669 err
= nf_tables_set_alloc_name(&ctx
, set
, name
);
2673 INIT_LIST_HEAD(&set
->bindings
);
2676 set
->klen
= desc
.klen
;
2678 set
->dlen
= desc
.dlen
;
2680 set
->size
= desc
.size
;
2681 set
->policy
= policy
;
2683 err
= ops
->init(set
, &desc
, nla
);
2687 err
= nft_trans_set_add(&ctx
, NFT_MSG_NEWSET
, set
);
2691 list_add_tail_rcu(&set
->list
, &table
->sets
);
2698 module_put(ops
->owner
);
2702 static void nft_set_destroy(struct nft_set
*set
)
2704 set
->ops
->destroy(set
);
2705 module_put(set
->ops
->owner
);
2709 static void nf_tables_set_destroy(const struct nft_ctx
*ctx
, struct nft_set
*set
)
2711 list_del_rcu(&set
->list
);
2712 nf_tables_set_notify(ctx
, set
, NFT_MSG_DELSET
, GFP_ATOMIC
);
2713 nft_set_destroy(set
);
2716 static int nf_tables_delset(struct sock
*nlsk
, struct sk_buff
*skb
,
2717 const struct nlmsghdr
*nlh
,
2718 const struct nlattr
* const nla
[])
2720 const struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
2721 struct nft_set
*set
;
2725 if (nfmsg
->nfgen_family
== NFPROTO_UNSPEC
)
2726 return -EAFNOSUPPORT
;
2727 if (nla
[NFTA_SET_TABLE
] == NULL
)
2730 err
= nft_ctx_init_from_setattr(&ctx
, skb
, nlh
, nla
);
2734 set
= nf_tables_set_lookup(ctx
.table
, nla
[NFTA_SET_NAME
]);
2736 return PTR_ERR(set
);
2737 if (set
->flags
& NFT_SET_INACTIVE
)
2739 if (!list_empty(&set
->bindings
))
2742 return nft_delset(&ctx
, set
);
2745 static int nf_tables_bind_check_setelem(const struct nft_ctx
*ctx
,
2746 const struct nft_set
*set
,
2747 const struct nft_set_iter
*iter
,
2748 const struct nft_set_elem
*elem
)
2750 enum nft_registers dreg
;
2752 dreg
= nft_type_to_reg(set
->dtype
);
2753 return nft_validate_data_load(ctx
, dreg
, &elem
->data
,
2754 set
->dtype
== NFT_DATA_VERDICT
?
2755 NFT_DATA_VERDICT
: NFT_DATA_VALUE
);
2758 int nf_tables_bind_set(const struct nft_ctx
*ctx
, struct nft_set
*set
,
2759 struct nft_set_binding
*binding
)
2761 struct nft_set_binding
*i
;
2762 struct nft_set_iter iter
;
2764 if (!list_empty(&set
->bindings
) && set
->flags
& NFT_SET_ANONYMOUS
)
2767 if (set
->flags
& NFT_SET_MAP
) {
2768 /* If the set is already bound to the same chain all
2769 * jumps are already validated for that chain.
2771 list_for_each_entry(i
, &set
->bindings
, list
) {
2772 if (i
->chain
== binding
->chain
)
2779 iter
.fn
= nf_tables_bind_check_setelem
;
2781 set
->ops
->walk(ctx
, set
, &iter
);
2783 /* Destroy anonymous sets if binding fails */
2784 if (set
->flags
& NFT_SET_ANONYMOUS
)
2785 nf_tables_set_destroy(ctx
, set
);
2791 binding
->chain
= ctx
->chain
;
2792 list_add_tail_rcu(&binding
->list
, &set
->bindings
);
2796 void nf_tables_unbind_set(const struct nft_ctx
*ctx
, struct nft_set
*set
,
2797 struct nft_set_binding
*binding
)
2799 list_del_rcu(&binding
->list
);
2801 if (list_empty(&set
->bindings
) && set
->flags
& NFT_SET_ANONYMOUS
&&
2802 !(set
->flags
& NFT_SET_INACTIVE
))
2803 nf_tables_set_destroy(ctx
, set
);
2810 static const struct nla_policy nft_set_elem_policy
[NFTA_SET_ELEM_MAX
+ 1] = {
2811 [NFTA_SET_ELEM_KEY
] = { .type
= NLA_NESTED
},
2812 [NFTA_SET_ELEM_DATA
] = { .type
= NLA_NESTED
},
2813 [NFTA_SET_ELEM_FLAGS
] = { .type
= NLA_U32
},
2816 static const struct nla_policy nft_set_elem_list_policy
[NFTA_SET_ELEM_LIST_MAX
+ 1] = {
2817 [NFTA_SET_ELEM_LIST_TABLE
] = { .type
= NLA_STRING
},
2818 [NFTA_SET_ELEM_LIST_SET
] = { .type
= NLA_STRING
},
2819 [NFTA_SET_ELEM_LIST_ELEMENTS
] = { .type
= NLA_NESTED
},
2820 [NFTA_SET_ELEM_LIST_SET_ID
] = { .type
= NLA_U32
},
2823 static int nft_ctx_init_from_elemattr(struct nft_ctx
*ctx
,
2824 const struct sk_buff
*skb
,
2825 const struct nlmsghdr
*nlh
,
2826 const struct nlattr
* const nla
[],
2829 const struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
2830 struct nft_af_info
*afi
;
2831 struct nft_table
*table
;
2832 struct net
*net
= sock_net(skb
->sk
);
2834 afi
= nf_tables_afinfo_lookup(net
, nfmsg
->nfgen_family
, false);
2836 return PTR_ERR(afi
);
2838 table
= nf_tables_table_lookup(afi
, nla
[NFTA_SET_ELEM_LIST_TABLE
]);
2840 return PTR_ERR(table
);
2841 if (!trans
&& (table
->flags
& NFT_TABLE_INACTIVE
))
2844 nft_ctx_init(ctx
, skb
, nlh
, afi
, table
, NULL
, nla
);
2848 static int nf_tables_fill_setelem(struct sk_buff
*skb
,
2849 const struct nft_set
*set
,
2850 const struct nft_set_elem
*elem
)
2852 unsigned char *b
= skb_tail_pointer(skb
);
2853 struct nlattr
*nest
;
2855 nest
= nla_nest_start(skb
, NFTA_LIST_ELEM
);
2857 goto nla_put_failure
;
2859 if (nft_data_dump(skb
, NFTA_SET_ELEM_KEY
, &elem
->key
, NFT_DATA_VALUE
,
2861 goto nla_put_failure
;
2863 if (set
->flags
& NFT_SET_MAP
&&
2864 !(elem
->flags
& NFT_SET_ELEM_INTERVAL_END
) &&
2865 nft_data_dump(skb
, NFTA_SET_ELEM_DATA
, &elem
->data
,
2866 set
->dtype
== NFT_DATA_VERDICT
? NFT_DATA_VERDICT
: NFT_DATA_VALUE
,
2868 goto nla_put_failure
;
2870 if (elem
->flags
!= 0)
2871 if (nla_put_be32(skb
, NFTA_SET_ELEM_FLAGS
, htonl(elem
->flags
)))
2872 goto nla_put_failure
;
2874 nla_nest_end(skb
, nest
);
2882 struct nft_set_dump_args
{
2883 const struct netlink_callback
*cb
;
2884 struct nft_set_iter iter
;
2885 struct sk_buff
*skb
;
2888 static int nf_tables_dump_setelem(const struct nft_ctx
*ctx
,
2889 const struct nft_set
*set
,
2890 const struct nft_set_iter
*iter
,
2891 const struct nft_set_elem
*elem
)
2893 struct nft_set_dump_args
*args
;
2895 args
= container_of(iter
, struct nft_set_dump_args
, iter
);
2896 return nf_tables_fill_setelem(args
->skb
, set
, elem
);
2899 static int nf_tables_dump_set(struct sk_buff
*skb
, struct netlink_callback
*cb
)
2901 const struct nft_set
*set
;
2902 struct nft_set_dump_args args
;
2904 struct nlattr
*nla
[NFTA_SET_ELEM_LIST_MAX
+ 1];
2905 struct nfgenmsg
*nfmsg
;
2906 struct nlmsghdr
*nlh
;
2907 struct nlattr
*nest
;
2911 err
= nlmsg_parse(cb
->nlh
, sizeof(struct nfgenmsg
), nla
,
2912 NFTA_SET_ELEM_LIST_MAX
, nft_set_elem_list_policy
);
2916 err
= nft_ctx_init_from_elemattr(&ctx
, cb
->skb
, cb
->nlh
, (void *)nla
,
2921 set
= nf_tables_set_lookup(ctx
.table
, nla
[NFTA_SET_ELEM_LIST_SET
]);
2923 return PTR_ERR(set
);
2924 if (set
->flags
& NFT_SET_INACTIVE
)
2927 event
= NFT_MSG_NEWSETELEM
;
2928 event
|= NFNL_SUBSYS_NFTABLES
<< 8;
2929 portid
= NETLINK_CB(cb
->skb
).portid
;
2930 seq
= cb
->nlh
->nlmsg_seq
;
2932 nlh
= nlmsg_put(skb
, portid
, seq
, event
, sizeof(struct nfgenmsg
),
2935 goto nla_put_failure
;
2937 nfmsg
= nlmsg_data(nlh
);
2938 nfmsg
->nfgen_family
= ctx
.afi
->family
;
2939 nfmsg
->version
= NFNETLINK_V0
;
2940 nfmsg
->res_id
= htons(ctx
.net
->nft
.base_seq
& 0xffff);
2942 if (nla_put_string(skb
, NFTA_SET_ELEM_LIST_TABLE
, ctx
.table
->name
))
2943 goto nla_put_failure
;
2944 if (nla_put_string(skb
, NFTA_SET_ELEM_LIST_SET
, set
->name
))
2945 goto nla_put_failure
;
2947 nest
= nla_nest_start(skb
, NFTA_SET_ELEM_LIST_ELEMENTS
);
2949 goto nla_put_failure
;
2953 args
.iter
.skip
= cb
->args
[0];
2954 args
.iter
.count
= 0;
2956 args
.iter
.fn
= nf_tables_dump_setelem
;
2957 set
->ops
->walk(&ctx
, set
, &args
.iter
);
2959 nla_nest_end(skb
, nest
);
2960 nlmsg_end(skb
, nlh
);
2962 if (args
.iter
.err
&& args
.iter
.err
!= -EMSGSIZE
)
2963 return args
.iter
.err
;
2964 if (args
.iter
.count
== cb
->args
[0])
2967 cb
->args
[0] = args
.iter
.count
;
2974 static int nf_tables_getsetelem(struct sock
*nlsk
, struct sk_buff
*skb
,
2975 const struct nlmsghdr
*nlh
,
2976 const struct nlattr
* const nla
[])
2978 const struct nft_set
*set
;
2982 err
= nft_ctx_init_from_elemattr(&ctx
, skb
, nlh
, nla
, false);
2986 set
= nf_tables_set_lookup(ctx
.table
, nla
[NFTA_SET_ELEM_LIST_SET
]);
2988 return PTR_ERR(set
);
2989 if (set
->flags
& NFT_SET_INACTIVE
)
2992 if (nlh
->nlmsg_flags
& NLM_F_DUMP
) {
2993 struct netlink_dump_control c
= {
2994 .dump
= nf_tables_dump_set
,
2996 return netlink_dump_start(nlsk
, skb
, nlh
, &c
);
3001 static int nf_tables_fill_setelem_info(struct sk_buff
*skb
,
3002 const struct nft_ctx
*ctx
, u32 seq
,
3003 u32 portid
, int event
, u16 flags
,
3004 const struct nft_set
*set
,
3005 const struct nft_set_elem
*elem
)
3007 struct nfgenmsg
*nfmsg
;
3008 struct nlmsghdr
*nlh
;
3009 struct nlattr
*nest
;
3012 event
|= NFNL_SUBSYS_NFTABLES
<< 8;
3013 nlh
= nlmsg_put(skb
, portid
, seq
, event
, sizeof(struct nfgenmsg
),
3016 goto nla_put_failure
;
3018 nfmsg
= nlmsg_data(nlh
);
3019 nfmsg
->nfgen_family
= ctx
->afi
->family
;
3020 nfmsg
->version
= NFNETLINK_V0
;
3021 nfmsg
->res_id
= htons(ctx
->net
->nft
.base_seq
& 0xffff);
3023 if (nla_put_string(skb
, NFTA_SET_TABLE
, ctx
->table
->name
))
3024 goto nla_put_failure
;
3025 if (nla_put_string(skb
, NFTA_SET_NAME
, set
->name
))
3026 goto nla_put_failure
;
3028 nest
= nla_nest_start(skb
, NFTA_SET_ELEM_LIST_ELEMENTS
);
3030 goto nla_put_failure
;
3032 err
= nf_tables_fill_setelem(skb
, set
, elem
);
3034 goto nla_put_failure
;
3036 nla_nest_end(skb
, nest
);
3038 return nlmsg_end(skb
, nlh
);
3041 nlmsg_trim(skb
, nlh
);
3045 static int nf_tables_setelem_notify(const struct nft_ctx
*ctx
,
3046 const struct nft_set
*set
,
3047 const struct nft_set_elem
*elem
,
3048 int event
, u16 flags
)
3050 struct net
*net
= ctx
->net
;
3051 u32 portid
= ctx
->portid
;
3052 struct sk_buff
*skb
;
3055 if (!ctx
->report
&& !nfnetlink_has_listeners(net
, NFNLGRP_NFTABLES
))
3059 skb
= nlmsg_new(NLMSG_GOODSIZE
, GFP_KERNEL
);
3063 err
= nf_tables_fill_setelem_info(skb
, ctx
, 0, portid
, event
, flags
,
3070 err
= nfnetlink_send(skb
, net
, portid
, NFNLGRP_NFTABLES
, ctx
->report
,
3074 nfnetlink_set_err(net
, portid
, NFNLGRP_NFTABLES
, err
);
3078 static struct nft_trans
*nft_trans_elem_alloc(struct nft_ctx
*ctx
,
3080 struct nft_set
*set
)
3082 struct nft_trans
*trans
;
3084 trans
= nft_trans_alloc(ctx
, msg_type
, sizeof(struct nft_trans_elem
));
3088 nft_trans_elem_set(trans
) = set
;
3092 static int nft_add_set_elem(struct nft_ctx
*ctx
, struct nft_set
*set
,
3093 const struct nlattr
*attr
)
3095 struct nlattr
*nla
[NFTA_SET_ELEM_MAX
+ 1];
3096 struct nft_data_desc d1
, d2
;
3097 struct nft_set_elem elem
;
3098 struct nft_set_binding
*binding
;
3099 enum nft_registers dreg
;
3100 struct nft_trans
*trans
;
3103 if (set
->size
&& set
->nelems
== set
->size
)
3106 err
= nla_parse_nested(nla
, NFTA_SET_ELEM_MAX
, attr
,
3107 nft_set_elem_policy
);
3111 if (nla
[NFTA_SET_ELEM_KEY
] == NULL
)
3115 if (nla
[NFTA_SET_ELEM_FLAGS
] != NULL
) {
3116 elem
.flags
= ntohl(nla_get_be32(nla
[NFTA_SET_ELEM_FLAGS
]));
3117 if (elem
.flags
& ~NFT_SET_ELEM_INTERVAL_END
)
3121 if (set
->flags
& NFT_SET_MAP
) {
3122 if (nla
[NFTA_SET_ELEM_DATA
] == NULL
&&
3123 !(elem
.flags
& NFT_SET_ELEM_INTERVAL_END
))
3125 if (nla
[NFTA_SET_ELEM_DATA
] != NULL
&&
3126 elem
.flags
& NFT_SET_ELEM_INTERVAL_END
)
3129 if (nla
[NFTA_SET_ELEM_DATA
] != NULL
)
3133 err
= nft_data_init(ctx
, &elem
.key
, &d1
, nla
[NFTA_SET_ELEM_KEY
]);
3137 if (d1
.type
!= NFT_DATA_VALUE
|| d1
.len
!= set
->klen
)
3141 if (set
->ops
->get(set
, &elem
) == 0)
3144 if (nla
[NFTA_SET_ELEM_DATA
] != NULL
) {
3145 err
= nft_data_init(ctx
, &elem
.data
, &d2
, nla
[NFTA_SET_ELEM_DATA
]);
3150 if (set
->dtype
!= NFT_DATA_VERDICT
&& d2
.len
!= set
->dlen
)
3153 dreg
= nft_type_to_reg(set
->dtype
);
3154 list_for_each_entry(binding
, &set
->bindings
, list
) {
3155 struct nft_ctx bind_ctx
= {
3157 .table
= ctx
->table
,
3158 .chain
= (struct nft_chain
*)binding
->chain
,
3161 err
= nft_validate_data_load(&bind_ctx
, dreg
,
3162 &elem
.data
, d2
.type
);
3168 trans
= nft_trans_elem_alloc(ctx
, NFT_MSG_NEWSETELEM
, set
);
3172 err
= set
->ops
->insert(set
, &elem
);
3176 nft_trans_elem(trans
) = elem
;
3177 list_add_tail(&trans
->list
, &ctx
->net
->nft
.commit_list
);
3183 if (nla
[NFTA_SET_ELEM_DATA
] != NULL
)
3184 nft_data_uninit(&elem
.data
, d2
.type
);
3186 nft_data_uninit(&elem
.key
, d1
.type
);
3191 static int nf_tables_newsetelem(struct sock
*nlsk
, struct sk_buff
*skb
,
3192 const struct nlmsghdr
*nlh
,
3193 const struct nlattr
* const nla
[])
3195 struct net
*net
= sock_net(skb
->sk
);
3196 const struct nlattr
*attr
;
3197 struct nft_set
*set
;
3201 if (nla
[NFTA_SET_ELEM_LIST_ELEMENTS
] == NULL
)
3204 err
= nft_ctx_init_from_elemattr(&ctx
, skb
, nlh
, nla
, true);
3208 set
= nf_tables_set_lookup(ctx
.table
, nla
[NFTA_SET_ELEM_LIST_SET
]);
3210 if (nla
[NFTA_SET_ELEM_LIST_SET_ID
]) {
3211 set
= nf_tables_set_lookup_byid(net
,
3212 nla
[NFTA_SET_ELEM_LIST_SET_ID
]);
3215 return PTR_ERR(set
);
3218 if (!list_empty(&set
->bindings
) && set
->flags
& NFT_SET_CONSTANT
)
3221 nla_for_each_nested(attr
, nla
[NFTA_SET_ELEM_LIST_ELEMENTS
], rem
) {
3222 err
= nft_add_set_elem(&ctx
, set
, attr
);
3231 static int nft_del_setelem(struct nft_ctx
*ctx
, struct nft_set
*set
,
3232 const struct nlattr
*attr
)
3234 struct nlattr
*nla
[NFTA_SET_ELEM_MAX
+ 1];
3235 struct nft_data_desc desc
;
3236 struct nft_set_elem elem
;
3237 struct nft_trans
*trans
;
3240 err
= nla_parse_nested(nla
, NFTA_SET_ELEM_MAX
, attr
,
3241 nft_set_elem_policy
);
3246 if (nla
[NFTA_SET_ELEM_KEY
] == NULL
)
3249 err
= nft_data_init(ctx
, &elem
.key
, &desc
, nla
[NFTA_SET_ELEM_KEY
]);
3254 if (desc
.type
!= NFT_DATA_VALUE
|| desc
.len
!= set
->klen
)
3257 err
= set
->ops
->get(set
, &elem
);
3261 trans
= nft_trans_elem_alloc(ctx
, NFT_MSG_DELSETELEM
, set
);
3262 if (trans
== NULL
) {
3267 nft_trans_elem(trans
) = elem
;
3268 list_add_tail(&trans
->list
, &ctx
->net
->nft
.commit_list
);
3271 nft_data_uninit(&elem
.key
, desc
.type
);
3276 static int nf_tables_delsetelem(struct sock
*nlsk
, struct sk_buff
*skb
,
3277 const struct nlmsghdr
*nlh
,
3278 const struct nlattr
* const nla
[])
3280 const struct nlattr
*attr
;
3281 struct nft_set
*set
;
3285 if (nla
[NFTA_SET_ELEM_LIST_ELEMENTS
] == NULL
)
3288 err
= nft_ctx_init_from_elemattr(&ctx
, skb
, nlh
, nla
, false);
3292 set
= nf_tables_set_lookup(ctx
.table
, nla
[NFTA_SET_ELEM_LIST_SET
]);
3294 return PTR_ERR(set
);
3295 if (!list_empty(&set
->bindings
) && set
->flags
& NFT_SET_CONSTANT
)
3298 nla_for_each_nested(attr
, nla
[NFTA_SET_ELEM_LIST_ELEMENTS
], rem
) {
3299 err
= nft_del_setelem(&ctx
, set
, attr
);
3308 static int nf_tables_fill_gen_info(struct sk_buff
*skb
, struct net
*net
,
3309 u32 portid
, u32 seq
)
3311 struct nlmsghdr
*nlh
;
3312 struct nfgenmsg
*nfmsg
;
3313 int event
= (NFNL_SUBSYS_NFTABLES
<< 8) | NFT_MSG_NEWGEN
;
3315 nlh
= nlmsg_put(skb
, portid
, seq
, event
, sizeof(struct nfgenmsg
), 0);
3317 goto nla_put_failure
;
3319 nfmsg
= nlmsg_data(nlh
);
3320 nfmsg
->nfgen_family
= AF_UNSPEC
;
3321 nfmsg
->version
= NFNETLINK_V0
;
3322 nfmsg
->res_id
= htons(net
->nft
.base_seq
& 0xffff);
3324 if (nla_put_be32(skb
, NFTA_GEN_ID
, htonl(net
->nft
.base_seq
)))
3325 goto nla_put_failure
;
3327 return nlmsg_end(skb
, nlh
);
3330 nlmsg_trim(skb
, nlh
);
3334 static int nf_tables_gen_notify(struct net
*net
, struct sk_buff
*skb
, int event
)
3336 struct nlmsghdr
*nlh
= nlmsg_hdr(skb
);
3337 struct sk_buff
*skb2
;
3340 if (nlmsg_report(nlh
) &&
3341 !nfnetlink_has_listeners(net
, NFNLGRP_NFTABLES
))
3345 skb2
= nlmsg_new(NLMSG_GOODSIZE
, GFP_KERNEL
);
3349 err
= nf_tables_fill_gen_info(skb2
, net
, NETLINK_CB(skb
).portid
,
3356 err
= nfnetlink_send(skb2
, net
, NETLINK_CB(skb
).portid
,
3357 NFNLGRP_NFTABLES
, nlmsg_report(nlh
), GFP_KERNEL
);
3360 nfnetlink_set_err(net
, NETLINK_CB(skb
).portid
, NFNLGRP_NFTABLES
,
3366 static int nf_tables_getgen(struct sock
*nlsk
, struct sk_buff
*skb
,
3367 const struct nlmsghdr
*nlh
,
3368 const struct nlattr
* const nla
[])
3370 struct net
*net
= sock_net(skb
->sk
);
3371 struct sk_buff
*skb2
;
3374 skb2
= alloc_skb(NLMSG_GOODSIZE
, GFP_KERNEL
);
3378 err
= nf_tables_fill_gen_info(skb2
, net
, NETLINK_CB(skb
).portid
,
3383 return nlmsg_unicast(nlsk
, skb2
, NETLINK_CB(skb
).portid
);
3389 static const struct nfnl_callback nf_tables_cb
[NFT_MSG_MAX
] = {
3390 [NFT_MSG_NEWTABLE
] = {
3391 .call_batch
= nf_tables_newtable
,
3392 .attr_count
= NFTA_TABLE_MAX
,
3393 .policy
= nft_table_policy
,
3395 [NFT_MSG_GETTABLE
] = {
3396 .call
= nf_tables_gettable
,
3397 .attr_count
= NFTA_TABLE_MAX
,
3398 .policy
= nft_table_policy
,
3400 [NFT_MSG_DELTABLE
] = {
3401 .call_batch
= nf_tables_deltable
,
3402 .attr_count
= NFTA_TABLE_MAX
,
3403 .policy
= nft_table_policy
,
3405 [NFT_MSG_NEWCHAIN
] = {
3406 .call_batch
= nf_tables_newchain
,
3407 .attr_count
= NFTA_CHAIN_MAX
,
3408 .policy
= nft_chain_policy
,
3410 [NFT_MSG_GETCHAIN
] = {
3411 .call
= nf_tables_getchain
,
3412 .attr_count
= NFTA_CHAIN_MAX
,
3413 .policy
= nft_chain_policy
,
3415 [NFT_MSG_DELCHAIN
] = {
3416 .call_batch
= nf_tables_delchain
,
3417 .attr_count
= NFTA_CHAIN_MAX
,
3418 .policy
= nft_chain_policy
,
3420 [NFT_MSG_NEWRULE
] = {
3421 .call_batch
= nf_tables_newrule
,
3422 .attr_count
= NFTA_RULE_MAX
,
3423 .policy
= nft_rule_policy
,
3425 [NFT_MSG_GETRULE
] = {
3426 .call
= nf_tables_getrule
,
3427 .attr_count
= NFTA_RULE_MAX
,
3428 .policy
= nft_rule_policy
,
3430 [NFT_MSG_DELRULE
] = {
3431 .call_batch
= nf_tables_delrule
,
3432 .attr_count
= NFTA_RULE_MAX
,
3433 .policy
= nft_rule_policy
,
3435 [NFT_MSG_NEWSET
] = {
3436 .call_batch
= nf_tables_newset
,
3437 .attr_count
= NFTA_SET_MAX
,
3438 .policy
= nft_set_policy
,
3440 [NFT_MSG_GETSET
] = {
3441 .call
= nf_tables_getset
,
3442 .attr_count
= NFTA_SET_MAX
,
3443 .policy
= nft_set_policy
,
3445 [NFT_MSG_DELSET
] = {
3446 .call_batch
= nf_tables_delset
,
3447 .attr_count
= NFTA_SET_MAX
,
3448 .policy
= nft_set_policy
,
3450 [NFT_MSG_NEWSETELEM
] = {
3451 .call_batch
= nf_tables_newsetelem
,
3452 .attr_count
= NFTA_SET_ELEM_LIST_MAX
,
3453 .policy
= nft_set_elem_list_policy
,
3455 [NFT_MSG_GETSETELEM
] = {
3456 .call
= nf_tables_getsetelem
,
3457 .attr_count
= NFTA_SET_ELEM_LIST_MAX
,
3458 .policy
= nft_set_elem_list_policy
,
3460 [NFT_MSG_DELSETELEM
] = {
3461 .call_batch
= nf_tables_delsetelem
,
3462 .attr_count
= NFTA_SET_ELEM_LIST_MAX
,
3463 .policy
= nft_set_elem_list_policy
,
3465 [NFT_MSG_GETGEN
] = {
3466 .call
= nf_tables_getgen
,
3470 static void nft_chain_commit_update(struct nft_trans
*trans
)
3472 struct nft_base_chain
*basechain
;
3474 if (nft_trans_chain_name(trans
)[0])
3475 strcpy(trans
->ctx
.chain
->name
, nft_trans_chain_name(trans
));
3477 if (!(trans
->ctx
.chain
->flags
& NFT_BASE_CHAIN
))
3480 basechain
= nft_base_chain(trans
->ctx
.chain
);
3481 nft_chain_stats_replace(basechain
, nft_trans_chain_stats(trans
));
3483 switch (nft_trans_chain_policy(trans
)) {
3486 basechain
->policy
= nft_trans_chain_policy(trans
);
3491 static void nf_tables_commit_release(struct nft_trans
*trans
)
3493 switch (trans
->msg_type
) {
3494 case NFT_MSG_DELTABLE
:
3495 nf_tables_table_destroy(&trans
->ctx
);
3497 case NFT_MSG_DELCHAIN
:
3498 nf_tables_chain_destroy(trans
->ctx
.chain
);
3500 case NFT_MSG_DELRULE
:
3501 nf_tables_rule_destroy(&trans
->ctx
, nft_trans_rule(trans
));
3503 case NFT_MSG_DELSET
:
3504 nft_set_destroy(nft_trans_set(trans
));
3510 static int nf_tables_commit(struct sk_buff
*skb
)
3512 struct net
*net
= sock_net(skb
->sk
);
3513 struct nft_trans
*trans
, *next
;
3514 struct nft_trans_elem
*te
;
3516 /* Bump generation counter, invalidate any dump in progress */
3517 while (++net
->nft
.base_seq
== 0);
3519 /* A new generation has just started */
3520 net
->nft
.gencursor
= gencursor_next(net
);
3522 /* Make sure all packets have left the previous generation before
3523 * purging old rules.
3527 list_for_each_entry_safe(trans
, next
, &net
->nft
.commit_list
, list
) {
3528 switch (trans
->msg_type
) {
3529 case NFT_MSG_NEWTABLE
:
3530 if (nft_trans_table_update(trans
)) {
3531 if (!nft_trans_table_enable(trans
)) {
3532 nf_tables_table_disable(trans
->ctx
.afi
,
3534 trans
->ctx
.table
->flags
|= NFT_TABLE_F_DORMANT
;
3537 trans
->ctx
.table
->flags
&= ~NFT_TABLE_INACTIVE
;
3539 nf_tables_table_notify(&trans
->ctx
, NFT_MSG_NEWTABLE
);
3540 nft_trans_destroy(trans
);
3542 case NFT_MSG_DELTABLE
:
3543 nf_tables_table_notify(&trans
->ctx
, NFT_MSG_DELTABLE
);
3545 case NFT_MSG_NEWCHAIN
:
3546 if (nft_trans_chain_update(trans
))
3547 nft_chain_commit_update(trans
);
3549 trans
->ctx
.chain
->flags
&= ~NFT_CHAIN_INACTIVE
;
3551 nf_tables_chain_notify(&trans
->ctx
, NFT_MSG_NEWCHAIN
);
3552 nft_trans_destroy(trans
);
3554 case NFT_MSG_DELCHAIN
:
3555 nf_tables_chain_notify(&trans
->ctx
, NFT_MSG_DELCHAIN
);
3556 nf_tables_unregister_hooks(trans
->ctx
.table
,
3558 trans
->ctx
.afi
->nops
);
3560 case NFT_MSG_NEWRULE
:
3561 nft_rule_clear(trans
->ctx
.net
, nft_trans_rule(trans
));
3562 nf_tables_rule_notify(&trans
->ctx
,
3563 nft_trans_rule(trans
),
3565 nft_trans_destroy(trans
);
3567 case NFT_MSG_DELRULE
:
3568 list_del_rcu(&nft_trans_rule(trans
)->list
);
3569 nf_tables_rule_notify(&trans
->ctx
,
3570 nft_trans_rule(trans
),
3573 case NFT_MSG_NEWSET
:
3574 nft_trans_set(trans
)->flags
&= ~NFT_SET_INACTIVE
;
3575 /* This avoids hitting -EBUSY when deleting the table
3576 * from the transaction.
3578 if (nft_trans_set(trans
)->flags
& NFT_SET_ANONYMOUS
&&
3579 !list_empty(&nft_trans_set(trans
)->bindings
))
3580 trans
->ctx
.table
->use
--;
3582 nf_tables_set_notify(&trans
->ctx
, nft_trans_set(trans
),
3583 NFT_MSG_NEWSET
, GFP_KERNEL
);
3584 nft_trans_destroy(trans
);
3586 case NFT_MSG_DELSET
:
3587 nf_tables_set_notify(&trans
->ctx
, nft_trans_set(trans
),
3588 NFT_MSG_DELSET
, GFP_KERNEL
);
3590 case NFT_MSG_NEWSETELEM
:
3591 nf_tables_setelem_notify(&trans
->ctx
,
3592 nft_trans_elem_set(trans
),
3593 &nft_trans_elem(trans
),
3594 NFT_MSG_NEWSETELEM
, 0);
3595 nft_trans_destroy(trans
);
3597 case NFT_MSG_DELSETELEM
:
3598 te
= (struct nft_trans_elem
*)trans
->data
;
3599 nf_tables_setelem_notify(&trans
->ctx
, te
->set
,
3601 NFT_MSG_DELSETELEM
, 0);
3602 te
->set
->ops
->get(te
->set
, &te
->elem
);
3603 te
->set
->ops
->remove(te
->set
, &te
->elem
);
3604 nft_data_uninit(&te
->elem
.key
, NFT_DATA_VALUE
);
3605 if (te
->elem
.flags
& NFT_SET_MAP
) {
3606 nft_data_uninit(&te
->elem
.data
,
3609 nft_trans_destroy(trans
);
3616 list_for_each_entry_safe(trans
, next
, &net
->nft
.commit_list
, list
) {
3617 list_del(&trans
->list
);
3618 nf_tables_commit_release(trans
);
3621 nf_tables_gen_notify(net
, skb
, NFT_MSG_NEWGEN
);
3626 static void nf_tables_abort_release(struct nft_trans
*trans
)
3628 switch (trans
->msg_type
) {
3629 case NFT_MSG_NEWTABLE
:
3630 nf_tables_table_destroy(&trans
->ctx
);
3632 case NFT_MSG_NEWCHAIN
:
3633 nf_tables_chain_destroy(trans
->ctx
.chain
);
3635 case NFT_MSG_NEWRULE
:
3636 nf_tables_rule_destroy(&trans
->ctx
, nft_trans_rule(trans
));
3638 case NFT_MSG_NEWSET
:
3639 nft_set_destroy(nft_trans_set(trans
));
3645 static int nf_tables_abort(struct sk_buff
*skb
)
3647 struct net
*net
= sock_net(skb
->sk
);
3648 struct nft_trans
*trans
, *next
;
3649 struct nft_set
*set
;
3651 list_for_each_entry_safe(trans
, next
, &net
->nft
.commit_list
, list
) {
3652 switch (trans
->msg_type
) {
3653 case NFT_MSG_NEWTABLE
:
3654 if (nft_trans_table_update(trans
)) {
3655 if (nft_trans_table_enable(trans
)) {
3656 nf_tables_table_disable(trans
->ctx
.afi
,
3658 trans
->ctx
.table
->flags
|= NFT_TABLE_F_DORMANT
;
3660 nft_trans_destroy(trans
);
3662 list_del_rcu(&trans
->ctx
.table
->list
);
3665 case NFT_MSG_DELTABLE
:
3666 list_add_tail_rcu(&trans
->ctx
.table
->list
,
3667 &trans
->ctx
.afi
->tables
);
3668 nft_trans_destroy(trans
);
3670 case NFT_MSG_NEWCHAIN
:
3671 if (nft_trans_chain_update(trans
)) {
3672 free_percpu(nft_trans_chain_stats(trans
));
3674 nft_trans_destroy(trans
);
3676 trans
->ctx
.table
->use
--;
3677 list_del_rcu(&trans
->ctx
.chain
->list
);
3678 nf_tables_unregister_hooks(trans
->ctx
.table
,
3680 trans
->ctx
.afi
->nops
);
3683 case NFT_MSG_DELCHAIN
:
3684 trans
->ctx
.table
->use
++;
3685 list_add_tail_rcu(&trans
->ctx
.chain
->list
,
3686 &trans
->ctx
.table
->chains
);
3687 nft_trans_destroy(trans
);
3689 case NFT_MSG_NEWRULE
:
3690 trans
->ctx
.chain
->use
--;
3691 list_del_rcu(&nft_trans_rule(trans
)->list
);
3693 case NFT_MSG_DELRULE
:
3694 trans
->ctx
.chain
->use
++;
3695 nft_rule_clear(trans
->ctx
.net
, nft_trans_rule(trans
));
3696 nft_trans_destroy(trans
);
3698 case NFT_MSG_NEWSET
:
3699 trans
->ctx
.table
->use
--;
3700 list_del_rcu(&nft_trans_set(trans
)->list
);
3702 case NFT_MSG_DELSET
:
3703 trans
->ctx
.table
->use
++;
3704 list_add_tail_rcu(&nft_trans_set(trans
)->list
,
3705 &trans
->ctx
.table
->sets
);
3706 nft_trans_destroy(trans
);
3708 case NFT_MSG_NEWSETELEM
:
3709 nft_trans_elem_set(trans
)->nelems
--;
3710 set
= nft_trans_elem_set(trans
);
3711 set
->ops
->get(set
, &nft_trans_elem(trans
));
3712 set
->ops
->remove(set
, &nft_trans_elem(trans
));
3713 nft_trans_destroy(trans
);
3715 case NFT_MSG_DELSETELEM
:
3716 nft_trans_elem_set(trans
)->nelems
++;
3717 nft_trans_destroy(trans
);
3724 list_for_each_entry_safe_reverse(trans
, next
,
3725 &net
->nft
.commit_list
, list
) {
3726 list_del(&trans
->list
);
3727 nf_tables_abort_release(trans
);
3733 static const struct nfnetlink_subsystem nf_tables_subsys
= {
3734 .name
= "nf_tables",
3735 .subsys_id
= NFNL_SUBSYS_NFTABLES
,
3736 .cb_count
= NFT_MSG_MAX
,
3738 .commit
= nf_tables_commit
,
3739 .abort
= nf_tables_abort
,
3742 int nft_chain_validate_dependency(const struct nft_chain
*chain
,
3743 enum nft_chain_type type
)
3745 const struct nft_base_chain
*basechain
;
3747 if (chain
->flags
& NFT_BASE_CHAIN
) {
3748 basechain
= nft_base_chain(chain
);
3749 if (basechain
->type
->type
!= type
)
3754 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency
);
3757 * Loop detection - walk through the ruleset beginning at the destination chain
3758 * of a new jump until either the source chain is reached (loop) or all
3759 * reachable chains have been traversed.
3761 * The loop check is performed whenever a new jump verdict is added to an
3762 * expression or verdict map or a verdict map is bound to a new chain.
3765 static int nf_tables_check_loops(const struct nft_ctx
*ctx
,
3766 const struct nft_chain
*chain
);
3768 static int nf_tables_loop_check_setelem(const struct nft_ctx
*ctx
,
3769 const struct nft_set
*set
,
3770 const struct nft_set_iter
*iter
,
3771 const struct nft_set_elem
*elem
)
3773 if (elem
->flags
& NFT_SET_ELEM_INTERVAL_END
)
3776 switch (elem
->data
.verdict
) {
3779 return nf_tables_check_loops(ctx
, elem
->data
.chain
);
3785 static int nf_tables_check_loops(const struct nft_ctx
*ctx
,
3786 const struct nft_chain
*chain
)
3788 const struct nft_rule
*rule
;
3789 const struct nft_expr
*expr
, *last
;
3790 const struct nft_set
*set
;
3791 struct nft_set_binding
*binding
;
3792 struct nft_set_iter iter
;
3794 if (ctx
->chain
== chain
)
3797 list_for_each_entry(rule
, &chain
->rules
, list
) {
3798 nft_rule_for_each_expr(expr
, last
, rule
) {
3799 const struct nft_data
*data
= NULL
;
3802 if (!expr
->ops
->validate
)
3805 err
= expr
->ops
->validate(ctx
, expr
, &data
);
3812 switch (data
->verdict
) {
3815 err
= nf_tables_check_loops(ctx
, data
->chain
);
3824 list_for_each_entry(set
, &ctx
->table
->sets
, list
) {
3825 if (!(set
->flags
& NFT_SET_MAP
) ||
3826 set
->dtype
!= NFT_DATA_VERDICT
)
3829 list_for_each_entry(binding
, &set
->bindings
, list
) {
3830 if (binding
->chain
!= chain
)
3836 iter
.fn
= nf_tables_loop_check_setelem
;
3838 set
->ops
->walk(ctx
, set
, &iter
);
3848 * nft_validate_input_register - validate an expressions' input register
3850 * @reg: the register number
3852 * Validate that the input register is one of the general purpose
3855 int nft_validate_input_register(enum nft_registers reg
)
3857 if (reg
<= NFT_REG_VERDICT
)
3859 if (reg
> NFT_REG_MAX
)
3863 EXPORT_SYMBOL_GPL(nft_validate_input_register
);
3866 * nft_validate_output_register - validate an expressions' output register
3868 * @reg: the register number
3870 * Validate that the output register is one of the general purpose
3871 * registers or the verdict register.
3873 int nft_validate_output_register(enum nft_registers reg
)
3875 if (reg
< NFT_REG_VERDICT
)
3877 if (reg
> NFT_REG_MAX
)
3881 EXPORT_SYMBOL_GPL(nft_validate_output_register
);
3884 * nft_validate_data_load - validate an expressions' data load
3886 * @ctx: context of the expression performing the load
3887 * @reg: the destination register number
3888 * @data: the data to load
3889 * @type: the data type
3891 * Validate that a data load uses the appropriate data type for
3892 * the destination register. A value of NULL for the data means
3893 * that its runtime gathered data, which is always of type
3896 int nft_validate_data_load(const struct nft_ctx
*ctx
, enum nft_registers reg
,
3897 const struct nft_data
*data
,
3898 enum nft_data_types type
)
3903 case NFT_REG_VERDICT
:
3904 if (data
== NULL
|| type
!= NFT_DATA_VERDICT
)
3907 if (data
->verdict
== NFT_GOTO
|| data
->verdict
== NFT_JUMP
) {
3908 err
= nf_tables_check_loops(ctx
, data
->chain
);
3912 if (ctx
->chain
->level
+ 1 > data
->chain
->level
) {
3913 if (ctx
->chain
->level
+ 1 == NFT_JUMP_STACK_SIZE
)
3915 data
->chain
->level
= ctx
->chain
->level
+ 1;
3921 if (data
!= NULL
&& type
!= NFT_DATA_VALUE
)
3926 EXPORT_SYMBOL_GPL(nft_validate_data_load
);
3928 static const struct nla_policy nft_verdict_policy
[NFTA_VERDICT_MAX
+ 1] = {
3929 [NFTA_VERDICT_CODE
] = { .type
= NLA_U32
},
3930 [NFTA_VERDICT_CHAIN
] = { .type
= NLA_STRING
,
3931 .len
= NFT_CHAIN_MAXNAMELEN
- 1 },
3934 static int nft_verdict_init(const struct nft_ctx
*ctx
, struct nft_data
*data
,
3935 struct nft_data_desc
*desc
, const struct nlattr
*nla
)
3937 struct nlattr
*tb
[NFTA_VERDICT_MAX
+ 1];
3938 struct nft_chain
*chain
;
3941 err
= nla_parse_nested(tb
, NFTA_VERDICT_MAX
, nla
, nft_verdict_policy
);
3945 if (!tb
[NFTA_VERDICT_CODE
])
3947 data
->verdict
= ntohl(nla_get_be32(tb
[NFTA_VERDICT_CODE
]));
3949 switch (data
->verdict
) {
3951 switch (data
->verdict
& NF_VERDICT_MASK
) {
3963 desc
->len
= sizeof(data
->verdict
);
3967 if (!tb
[NFTA_VERDICT_CHAIN
])
3969 chain
= nf_tables_chain_lookup(ctx
->table
,
3970 tb
[NFTA_VERDICT_CHAIN
]);
3972 return PTR_ERR(chain
);
3973 if (chain
->flags
& NFT_BASE_CHAIN
)
3977 data
->chain
= chain
;
3978 desc
->len
= sizeof(data
);
3982 desc
->type
= NFT_DATA_VERDICT
;
3986 static void nft_verdict_uninit(const struct nft_data
*data
)
3988 switch (data
->verdict
) {
3996 static int nft_verdict_dump(struct sk_buff
*skb
, const struct nft_data
*data
)
3998 struct nlattr
*nest
;
4000 nest
= nla_nest_start(skb
, NFTA_DATA_VERDICT
);
4002 goto nla_put_failure
;
4004 if (nla_put_be32(skb
, NFTA_VERDICT_CODE
, htonl(data
->verdict
)))
4005 goto nla_put_failure
;
4007 switch (data
->verdict
) {
4010 if (nla_put_string(skb
, NFTA_VERDICT_CHAIN
, data
->chain
->name
))
4011 goto nla_put_failure
;
4013 nla_nest_end(skb
, nest
);
4020 static int nft_value_init(const struct nft_ctx
*ctx
, struct nft_data
*data
,
4021 struct nft_data_desc
*desc
, const struct nlattr
*nla
)
4028 if (len
> sizeof(data
->data
))
4031 nla_memcpy(data
->data
, nla
, sizeof(data
->data
));
4032 desc
->type
= NFT_DATA_VALUE
;
4037 static int nft_value_dump(struct sk_buff
*skb
, const struct nft_data
*data
,
4040 return nla_put(skb
, NFTA_DATA_VALUE
, len
, data
->data
);
4043 static const struct nla_policy nft_data_policy
[NFTA_DATA_MAX
+ 1] = {
4044 [NFTA_DATA_VALUE
] = { .type
= NLA_BINARY
,
4045 .len
= FIELD_SIZEOF(struct nft_data
, data
) },
4046 [NFTA_DATA_VERDICT
] = { .type
= NLA_NESTED
},
4050 * nft_data_init - parse nf_tables data netlink attributes
4052 * @ctx: context of the expression using the data
4053 * @data: destination struct nft_data
4054 * @desc: data description
4055 * @nla: netlink attribute containing data
4057 * Parse the netlink data attributes and initialize a struct nft_data.
4058 * The type and length of data are returned in the data description.
4060 * The caller can indicate that it only wants to accept data of type
4061 * NFT_DATA_VALUE by passing NULL for the ctx argument.
4063 int nft_data_init(const struct nft_ctx
*ctx
, struct nft_data
*data
,
4064 struct nft_data_desc
*desc
, const struct nlattr
*nla
)
4066 struct nlattr
*tb
[NFTA_DATA_MAX
+ 1];
4069 err
= nla_parse_nested(tb
, NFTA_DATA_MAX
, nla
, nft_data_policy
);
4073 if (tb
[NFTA_DATA_VALUE
])
4074 return nft_value_init(ctx
, data
, desc
, tb
[NFTA_DATA_VALUE
]);
4075 if (tb
[NFTA_DATA_VERDICT
] && ctx
!= NULL
)
4076 return nft_verdict_init(ctx
, data
, desc
, tb
[NFTA_DATA_VERDICT
]);
4079 EXPORT_SYMBOL_GPL(nft_data_init
);
4082 * nft_data_uninit - release a nft_data item
4084 * @data: struct nft_data to release
4085 * @type: type of data
4087 * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
4088 * all others need to be released by calling this function.
4090 void nft_data_uninit(const struct nft_data
*data
, enum nft_data_types type
)
4093 case NFT_DATA_VALUE
:
4095 case NFT_DATA_VERDICT
:
4096 return nft_verdict_uninit(data
);
4101 EXPORT_SYMBOL_GPL(nft_data_uninit
);
4103 int nft_data_dump(struct sk_buff
*skb
, int attr
, const struct nft_data
*data
,
4104 enum nft_data_types type
, unsigned int len
)
4106 struct nlattr
*nest
;
4109 nest
= nla_nest_start(skb
, attr
);
4114 case NFT_DATA_VALUE
:
4115 err
= nft_value_dump(skb
, data
, len
);
4117 case NFT_DATA_VERDICT
:
4118 err
= nft_verdict_dump(skb
, data
);
4125 nla_nest_end(skb
, nest
);
4128 EXPORT_SYMBOL_GPL(nft_data_dump
);
4130 static int nf_tables_init_net(struct net
*net
)
4132 INIT_LIST_HEAD(&net
->nft
.af_info
);
4133 INIT_LIST_HEAD(&net
->nft
.commit_list
);
4134 net
->nft
.base_seq
= 1;
4138 static struct pernet_operations nf_tables_net_ops
= {
4139 .init
= nf_tables_init_net
,
4142 static int __init
nf_tables_module_init(void)
4146 info
= kmalloc(sizeof(struct nft_expr_info
) * NFT_RULE_MAXEXPRS
,
4153 err
= nf_tables_core_module_init();
4157 err
= nfnetlink_subsys_register(&nf_tables_subsys
);
4161 pr_info("nf_tables: (c) 2007-2009 Patrick McHardy <kaber@trash.net>\n");
4162 return register_pernet_subsys(&nf_tables_net_ops
);
4164 nf_tables_core_module_exit();
4171 static void __exit
nf_tables_module_exit(void)
4173 unregister_pernet_subsys(&nf_tables_net_ops
);
4174 nfnetlink_subsys_unregister(&nf_tables_subsys
);
4176 nf_tables_core_module_exit();
4180 module_init(nf_tables_module_init
);
4181 module_exit(nf_tables_module_exit
);
4183 MODULE_LICENSE("GPL");
4184 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
4185 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES
);