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(const struct nf_hook_ops *ops,
26 const struct net_device *in,
27 const struct net_device *out,
28 int (*okfn)(struct sk_buff *))
31 struct nft_pktinfo pkt;
35 const struct iphdr *iph;
37 /* root is playing with raw sockets. */
38 if (skb->len < sizeof(struct iphdr) ||
39 ip_hdrlen(skb) < sizeof(struct iphdr))
42 nft_set_pktinfo_ipv4(&pkt, ops, skb, in, out);
50 ret = nft_do_chain_pktinfo(&pkt, ops);
51 if (ret != NF_DROP && ret != NF_QUEUE) {
54 if (iph->saddr != saddr ||
55 iph->daddr != daddr ||
58 if (ip_route_me_harder(skb, RTN_UNSPEC))
64 static struct nf_chain_type nft_chain_route_ipv4 = {
65 .family = NFPROTO_IPV4,
67 .type = NFT_CHAIN_T_ROUTE,
68 .hook_mask = (1 << NF_INET_LOCAL_OUT),
70 [NF_INET_LOCAL_OUT] = nf_route_table_hook,
75 static int __init nft_chain_route_init(void)
77 return nft_register_chain_type(&nft_chain_route_ipv4);
80 static void __exit nft_chain_route_exit(void)
82 nft_unregister_chain_type(&nft_chain_route_ipv4);
85 module_init(nft_chain_route_init);
86 module_exit(nft_chain_route_exit);
88 MODULE_LICENSE("GPL");
89 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
90 MODULE_ALIAS_NFT_CHAIN(AF_INET, "route");