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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> |
96518518 PM |
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 | ||
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> | |
0ca743a5 | 20 | #include <net/netfilter/nf_tables_ipv4.h> |
96518518 PM |
21 | #include <net/route.h> |
22 | #include <net/ip.h> | |
23 | ||
24 | static unsigned int nf_route_table_hook(const struct nf_hook_ops *ops, | |
25 | struct sk_buff *skb, | |
26 | const struct net_device *in, | |
27 | const struct net_device *out, | |
28 | int (*okfn)(struct sk_buff *)) | |
29 | { | |
30 | unsigned int ret; | |
0ca743a5 | 31 | struct nft_pktinfo pkt; |
96518518 PM |
32 | u32 mark; |
33 | __be32 saddr, daddr; | |
34 | u_int8_t tos; | |
35 | const struct iphdr *iph; | |
36 | ||
37 | /* root is playing with raw sockets. */ | |
38 | if (skb->len < sizeof(struct iphdr) || | |
39 | ip_hdrlen(skb) < sizeof(struct iphdr)) | |
40 | return NF_ACCEPT; | |
41 | ||
0ca743a5 PNA |
42 | nft_set_pktinfo_ipv4(&pkt, ops, skb, in, out); |
43 | ||
96518518 PM |
44 | mark = skb->mark; |
45 | iph = ip_hdr(skb); | |
46 | saddr = iph->saddr; | |
47 | daddr = iph->daddr; | |
48 | tos = iph->tos; | |
49 | ||
3876d22d | 50 | ret = nft_do_chain(&pkt, ops); |
96518518 PM |
51 | if (ret != NF_DROP && ret != NF_QUEUE) { |
52 | iph = ip_hdr(skb); | |
53 | ||
54 | if (iph->saddr != saddr || | |
55 | iph->daddr != daddr || | |
56 | skb->mark != mark || | |
57 | iph->tos != tos) | |
58 | if (ip_route_me_harder(skb, RTN_UNSPEC)) | |
59 | ret = NF_DROP; | |
60 | } | |
61 | return ret; | |
62 | } | |
63 | ||
2a37d755 | 64 | static const struct nf_chain_type nft_chain_route_ipv4 = { |
9370761c PNA |
65 | .name = "route", |
66 | .type = NFT_CHAIN_T_ROUTE, | |
fa2c1de0 PM |
67 | .family = NFPROTO_IPV4, |
68 | .owner = THIS_MODULE, | |
9370761c | 69 | .hook_mask = (1 << NF_INET_LOCAL_OUT), |
fa2c1de0 | 70 | .hooks = { |
9370761c | 71 | [NF_INET_LOCAL_OUT] = nf_route_table_hook, |
96518518 | 72 | }, |
96518518 PM |
73 | }; |
74 | ||
9370761c | 75 | static int __init nft_chain_route_init(void) |
96518518 | 76 | { |
9370761c | 77 | return nft_register_chain_type(&nft_chain_route_ipv4); |
96518518 PM |
78 | } |
79 | ||
9370761c | 80 | static void __exit nft_chain_route_exit(void) |
96518518 | 81 | { |
9370761c | 82 | nft_unregister_chain_type(&nft_chain_route_ipv4); |
96518518 PM |
83 | } |
84 | ||
9370761c PNA |
85 | module_init(nft_chain_route_init); |
86 | module_exit(nft_chain_route_exit); | |
96518518 PM |
87 | |
88 | MODULE_LICENSE("GPL"); | |
89 | MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); | |
9370761c | 90 | MODULE_ALIAS_NFT_CHAIN(AF_INET, "route"); |