2 * Copyright (c) 2008 Patrick McHardy <kaber@trash.net>
3 * Copyright (c) 2012 Pablo Neira Ayuso <pablo@netfilter.org>
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
10 #include <linux/module.h>
11 #include <linux/init.h>
12 #include <linux/list.h>
13 #include <linux/skbuff.h>
14 #include <linux/netlink.h>
15 #include <linux/netfilter.h>
16 #include <linux/netfilter_ipv4.h>
17 #include <linux/netfilter/nfnetlink.h>
18 #include <linux/netfilter/nf_tables.h>
19 #include <net/netfilter/nf_tables.h>
20 #include <net/netfilter/nf_tables_ipv4.h>
21 #include <net/route.h>
24 static unsigned int nf_route_table_hook(void *priv
,
26 const struct nf_hook_state
*state
)
29 struct nft_pktinfo pkt
;
33 const struct iphdr
*iph
;
36 /* root is playing with raw sockets. */
37 if (skb
->len
< sizeof(struct iphdr
) ||
38 ip_hdrlen(skb
) < sizeof(struct iphdr
))
41 nft_set_pktinfo_ipv4(&pkt
, skb
, state
);
49 ret
= nft_do_chain(&pkt
, priv
);
50 if (ret
!= NF_DROP
&& ret
!= NF_STOLEN
) {
53 if (iph
->saddr
!= saddr
||
54 iph
->daddr
!= daddr
||
57 err
= ip_route_me_harder(state
->net
, skb
, RTN_UNSPEC
);
59 ret
= NF_DROP_ERR(err
);
65 static const struct nf_chain_type nft_chain_route_ipv4
= {
67 .type
= NFT_CHAIN_T_ROUTE
,
68 .family
= NFPROTO_IPV4
,
70 .hook_mask
= (1 << NF_INET_LOCAL_OUT
),
72 [NF_INET_LOCAL_OUT
] = nf_route_table_hook
,
76 static int __init
nft_chain_route_init(void)
78 return nft_register_chain_type(&nft_chain_route_ipv4
);
81 static void __exit
nft_chain_route_exit(void)
83 nft_unregister_chain_type(&nft_chain_route_ipv4
);
86 module_init(nft_chain_route_init
);
87 module_exit(nft_chain_route_exit
);
89 MODULE_LICENSE("GPL");
90 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
91 MODULE_ALIAS_NFT_CHAIN(AF_INET
, "route");