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96518518 PM |
1 | /* |
2 | * Copyright (c) 2008 Patrick McHardy <kaber@trash.net> | |
9370761c | 3 | * Copyright (c) 2012 Pablo Neira Ayuso <pablo@netfilter.org> |
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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> | |
0ca743a5 | 22 | #include <net/netfilter/nf_tables_ipv6.h> |
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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, | |
238e54c9 | 27 | const struct nf_hook_state *state) |
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28 | { |
29 | unsigned int ret; | |
0ca743a5 | 30 | struct nft_pktinfo pkt; |
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31 | struct in6_addr saddr, daddr; |
32 | u_int8_t hop_limit; | |
33 | u32 mark, flowlabel; | |
34 | ||
0ca743a5 | 35 | /* malformed packet, drop it */ |
073bfd56 | 36 | if (nft_set_pktinfo_ipv6(&pkt, ops, skb, state) < 0) |
0ca743a5 PNA |
37 | return NF_DROP; |
38 | ||
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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 | ||
3876d22d | 48 | ret = nft_do_chain(&pkt, ops); |
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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 | ||
2a37d755 | 60 | static const struct nf_chain_type nft_chain_route_ipv6 = { |
9370761c PNA |
61 | .name = "route", |
62 | .type = NFT_CHAIN_T_ROUTE, | |
fa2c1de0 PM |
63 | .family = NFPROTO_IPV6, |
64 | .owner = THIS_MODULE, | |
9370761c | 65 | .hook_mask = (1 << NF_INET_LOCAL_OUT), |
fa2c1de0 | 66 | .hooks = { |
9370761c PNA |
67 | [NF_INET_LOCAL_OUT] = nf_route_table_hook, |
68 | }, | |
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69 | }; |
70 | ||
9370761c | 71 | static int __init nft_chain_route_init(void) |
96518518 | 72 | { |
9370761c | 73 | return nft_register_chain_type(&nft_chain_route_ipv6); |
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74 | } |
75 | ||
9370761c | 76 | static void __exit nft_chain_route_exit(void) |
96518518 | 77 | { |
9370761c | 78 | nft_unregister_chain_type(&nft_chain_route_ipv6); |
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79 | } |
80 | ||
9370761c PNA |
81 | module_init(nft_chain_route_init); |
82 | module_exit(nft_chain_route_exit); | |
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83 | |
84 | MODULE_LICENSE("GPL"); | |
85 | MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); | |
9370761c | 86 | MODULE_ALIAS_NFT_CHAIN(AF_INET6, "route"); |