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 nft_set_pktinfo(&pkt, skb, state);
37 nft_set_pktinfo_ipv4(&pkt, skb);
45 ret = nft_do_chain(&pkt, priv);
46 if (ret != NF_DROP && ret != NF_STOLEN) {
49 if (iph->saddr != saddr ||
50 iph->daddr != daddr ||
53 err = ip_route_me_harder(state->net, skb, RTN_UNSPEC);
55 ret = NF_DROP_ERR(err);
61 static const struct nft_chain_type nft_chain_route_ipv4 = {
63 .type = NFT_CHAIN_T_ROUTE,
64 .family = NFPROTO_IPV4,
66 .hook_mask = (1 << NF_INET_LOCAL_OUT),
68 [NF_INET_LOCAL_OUT] = nf_route_table_hook,
72 static int __init nft_chain_route_init(void)
74 nft_register_chain_type(&nft_chain_route_ipv4);
79 static void __exit nft_chain_route_exit(void)
81 nft_unregister_chain_type(&nft_chain_route_ipv4);
84 module_init(nft_chain_route_init);
85 module_exit(nft_chain_route_exit);
87 MODULE_LICENSE("GPL");
88 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
89 MODULE_ALIAS_NFT_CHAIN(AF_INET, "route");