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.
9 * Development of this code funded by Astaro AG (http://www.astaro.com/)
12 #include <linux/module.h>
13 #include <linux/init.h>
14 #include <linux/list.h>
15 #include <linux/skbuff.h>
16 #include <linux/netlink.h>
17 #include <linux/netfilter.h>
18 #include <linux/netfilter_ipv6.h>
19 #include <linux/netfilter/nfnetlink.h>
20 #include <linux/netfilter/nf_tables.h>
21 #include <net/netfilter/nf_tables.h>
22 #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 in6_addr saddr, daddr;
35 /* save source/dest address, mark, hoplimit, flowlabel, priority */
36 memcpy(&saddr, &ipv6_hdr(skb)->saddr, sizeof(saddr));
37 memcpy(&daddr, &ipv6_hdr(skb)->daddr, sizeof(daddr));
39 hop_limit = ipv6_hdr(skb)->hop_limit;
41 /* flowlabel and prio (includes version, which shouldn't change either */
42 flowlabel = *((u32 *)ipv6_hdr(skb));
44 ret = nft_do_chain(ops, skb, in, out, okfn);
45 if (ret != NF_DROP && ret != NF_QUEUE &&
46 (memcmp(&ipv6_hdr(skb)->saddr, &saddr, sizeof(saddr)) ||
47 memcmp(&ipv6_hdr(skb)->daddr, &daddr, sizeof(daddr)) ||
49 ipv6_hdr(skb)->hop_limit != hop_limit ||
50 flowlabel != *((u_int32_t *)ipv6_hdr(skb))))
51 return ip6_route_me_harder(skb) == 0 ? ret : NF_DROP;
56 static struct nf_chain_type nft_chain_route_ipv6 = {
57 .family = NFPROTO_IPV6,
59 .type = NFT_CHAIN_T_ROUTE,
60 .hook_mask = (1 << NF_INET_LOCAL_OUT),
62 [NF_INET_LOCAL_OUT] = nf_route_table_hook,
67 static int __init nft_chain_route_init(void)
69 return nft_register_chain_type(&nft_chain_route_ipv6);
72 static void __exit nft_chain_route_exit(void)
74 nft_unregister_chain_type(&nft_chain_route_ipv6);
77 module_init(nft_chain_route_init);
78 module_exit(nft_chain_route_exit);
80 MODULE_LICENSE("GPL");
81 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
82 MODULE_ALIAS_NFT_CHAIN(AF_INET6, "route");