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/netfilter/nf_tables_ipv6.h>
23 #include <net/route.h>
25 static unsigned int nf_route_table_hook(void *priv,
27 const struct nf_hook_state *state)
30 struct nft_pktinfo pkt;
31 struct in6_addr saddr, daddr;
36 /* malformed packet, drop it */
37 if (nft_set_pktinfo_ipv6(&pkt, skb, state) < 0)
40 /* save source/dest address, mark, hoplimit, flowlabel, priority */
41 memcpy(&saddr, &ipv6_hdr(skb)->saddr, sizeof(saddr));
42 memcpy(&daddr, &ipv6_hdr(skb)->daddr, sizeof(daddr));
44 hop_limit = ipv6_hdr(skb)->hop_limit;
46 /* flowlabel and prio (includes version, which shouldn't change either */
47 flowlabel = *((u32 *)ipv6_hdr(skb));
49 ret = nft_do_chain(&pkt, priv);
50 if (ret != NF_DROP && ret != NF_STOLEN &&
51 (memcmp(&ipv6_hdr(skb)->saddr, &saddr, sizeof(saddr)) ||
52 memcmp(&ipv6_hdr(skb)->daddr, &daddr, sizeof(daddr)) ||
54 ipv6_hdr(skb)->hop_limit != hop_limit ||
55 flowlabel != *((u_int32_t *)ipv6_hdr(skb)))) {
56 err = ip6_route_me_harder(state->net, skb);
58 ret = NF_DROP_ERR(err);
64 static const struct nf_chain_type nft_chain_route_ipv6 = {
66 .type = NFT_CHAIN_T_ROUTE,
67 .family = NFPROTO_IPV6,
69 .hook_mask = (1 << NF_INET_LOCAL_OUT),
71 [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_ipv6);
80 static void __exit nft_chain_route_exit(void)
82 nft_unregister_chain_type(&nft_chain_route_ipv6);
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_INET6, "route");