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/route.h>
23 static unsigned int nf_route_table_hook(const struct nf_hook_ops *ops,
25 const struct net_device *in,
26 const struct net_device *out,
27 int (*okfn)(struct sk_buff *))
33 const struct iphdr *iph;
35 /* root is playing with raw sockets. */
36 if (skb->len < sizeof(struct iphdr) ||
37 ip_hdrlen(skb) < sizeof(struct iphdr))
46 ret = nft_do_chain(ops, skb, in, out, okfn);
47 if (ret != NF_DROP && ret != NF_QUEUE) {
50 if (iph->saddr != saddr ||
51 iph->daddr != daddr ||
54 if (ip_route_me_harder(skb, RTN_UNSPEC))
60 static struct nf_chain_type nft_chain_route_ipv4 = {
61 .family = NFPROTO_IPV4,
63 .type = NFT_CHAIN_T_ROUTE,
64 .hook_mask = (1 << NF_INET_LOCAL_OUT),
66 [NF_INET_LOCAL_OUT] = nf_route_table_hook,
71 static int __init nft_chain_route_init(void)
73 return nft_register_chain_type(&nft_chain_route_ipv4);
76 static void __exit nft_chain_route_exit(void)
78 nft_unregister_chain_type(&nft_chain_route_ipv4);
81 module_init(nft_chain_route_init);
82 module_exit(nft_chain_route_exit);
84 MODULE_LICENSE("GPL");
85 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
86 MODULE_ALIAS_NFT_CHAIN(AF_INET, "route");