Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2008 Patrick McHardy <kaber@trash.net> |
Pablo Neira Ayuso | 9370761 | 2013-10-10 23:21:26 +0200 | [diff] [blame] | 3 | * Copyright (c) 2012 Pablo Neira Ayuso <pablo@netfilter.org> |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 4 | * |
| 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. |
| 8 | * |
| 9 | * Development of this code funded by Astaro AG (http://www.astaro.com/) |
| 10 | */ |
| 11 | |
| 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> |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 22 | #include <net/netfilter/nf_tables_ipv6.h> |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 23 | #include <net/route.h> |
| 24 | |
| 25 | static unsigned int nf_route_table_hook(const struct nf_hook_ops *ops, |
| 26 | struct sk_buff *skb, |
David S. Miller | 238e54c | 2015-04-03 20:32:56 -0400 | [diff] [blame^] | 27 | const struct nf_hook_state *state) |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 28 | { |
| 29 | unsigned int ret; |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 30 | struct nft_pktinfo pkt; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 31 | struct in6_addr saddr, daddr; |
| 32 | u_int8_t hop_limit; |
| 33 | u32 mark, flowlabel; |
| 34 | |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 35 | /* malformed packet, drop it */ |
David S. Miller | 238e54c | 2015-04-03 20:32:56 -0400 | [diff] [blame^] | 36 | if (nft_set_pktinfo_ipv6(&pkt, ops, skb, state->in, state->out) < 0) |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 37 | return NF_DROP; |
| 38 | |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 39 | /* save source/dest address, mark, hoplimit, flowlabel, priority */ |
| 40 | memcpy(&saddr, &ipv6_hdr(skb)->saddr, sizeof(saddr)); |
| 41 | memcpy(&daddr, &ipv6_hdr(skb)->daddr, sizeof(daddr)); |
| 42 | mark = skb->mark; |
| 43 | hop_limit = ipv6_hdr(skb)->hop_limit; |
| 44 | |
| 45 | /* flowlabel and prio (includes version, which shouldn't change either */ |
| 46 | flowlabel = *((u32 *)ipv6_hdr(skb)); |
| 47 | |
Patrick McHardy | 3876d22 | 2014-01-09 18:42:43 +0000 | [diff] [blame] | 48 | ret = nft_do_chain(&pkt, ops); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 49 | if (ret != NF_DROP && ret != NF_QUEUE && |
| 50 | (memcmp(&ipv6_hdr(skb)->saddr, &saddr, sizeof(saddr)) || |
| 51 | memcmp(&ipv6_hdr(skb)->daddr, &daddr, sizeof(daddr)) || |
| 52 | skb->mark != mark || |
| 53 | ipv6_hdr(skb)->hop_limit != hop_limit || |
| 54 | flowlabel != *((u_int32_t *)ipv6_hdr(skb)))) |
| 55 | return ip6_route_me_harder(skb) == 0 ? ret : NF_DROP; |
| 56 | |
| 57 | return ret; |
| 58 | } |
| 59 | |
Patrick McHardy | 2a37d75 | 2014-01-09 18:42:37 +0000 | [diff] [blame] | 60 | static const struct nf_chain_type nft_chain_route_ipv6 = { |
Pablo Neira Ayuso | 9370761 | 2013-10-10 23:21:26 +0200 | [diff] [blame] | 61 | .name = "route", |
| 62 | .type = NFT_CHAIN_T_ROUTE, |
Patrick McHardy | fa2c1de | 2014-01-09 18:42:38 +0000 | [diff] [blame] | 63 | .family = NFPROTO_IPV6, |
| 64 | .owner = THIS_MODULE, |
Pablo Neira Ayuso | 9370761 | 2013-10-10 23:21:26 +0200 | [diff] [blame] | 65 | .hook_mask = (1 << NF_INET_LOCAL_OUT), |
Patrick McHardy | fa2c1de | 2014-01-09 18:42:38 +0000 | [diff] [blame] | 66 | .hooks = { |
Pablo Neira Ayuso | 9370761 | 2013-10-10 23:21:26 +0200 | [diff] [blame] | 67 | [NF_INET_LOCAL_OUT] = nf_route_table_hook, |
| 68 | }, |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 69 | }; |
| 70 | |
Pablo Neira Ayuso | 9370761 | 2013-10-10 23:21:26 +0200 | [diff] [blame] | 71 | static int __init nft_chain_route_init(void) |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 72 | { |
Pablo Neira Ayuso | 9370761 | 2013-10-10 23:21:26 +0200 | [diff] [blame] | 73 | return nft_register_chain_type(&nft_chain_route_ipv6); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 74 | } |
| 75 | |
Pablo Neira Ayuso | 9370761 | 2013-10-10 23:21:26 +0200 | [diff] [blame] | 76 | static void __exit nft_chain_route_exit(void) |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 77 | { |
Pablo Neira Ayuso | 9370761 | 2013-10-10 23:21:26 +0200 | [diff] [blame] | 78 | nft_unregister_chain_type(&nft_chain_route_ipv6); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 79 | } |
| 80 | |
Pablo Neira Ayuso | 9370761 | 2013-10-10 23:21:26 +0200 | [diff] [blame] | 81 | module_init(nft_chain_route_init); |
| 82 | module_exit(nft_chain_route_exit); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 83 | |
| 84 | MODULE_LICENSE("GPL"); |
| 85 | MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); |
Pablo Neira Ayuso | 9370761 | 2013-10-10 23:21:26 +0200 | [diff] [blame] | 86 | MODULE_ALIAS_NFT_CHAIN(AF_INET6, "route"); |