projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 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 | * 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> |
| 96518518 PM |
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, | |
| 27 | const struct net_device *in, | |
| 28 | const struct net_device *out, | |
| 29 | int (*okfn)(struct sk_buff *)) | |
| 30 | { | |
| 31 | unsigned int ret; | |
| 0ca743a5 | 32 | struct nft_pktinfo pkt; |
| 96518518 PM |
33 | struct in6_addr saddr, daddr; |
| 34 | u_int8_t hop_limit; | |
| 35 | u32 mark, flowlabel; | |
| 36 | ||
| 0ca743a5 PNA |
37 | /* malformed packet, drop it */ |
| 38 | if (nft_set_pktinfo_ipv6(&pkt, ops, skb, in, out) < 0) | |
| 39 | return NF_DROP; | |
| 40 | ||
| 96518518 PM |
41 | /* save source/dest address, mark, hoplimit, flowlabel, priority */ |
| 42 | memcpy(&saddr, &ipv6_hdr(skb)->saddr, sizeof(saddr)); | |
| 43 | memcpy(&daddr, &ipv6_hdr(skb)->daddr, sizeof(daddr)); | |
| 44 | mark = skb->mark; | |
| 45 | hop_limit = ipv6_hdr(skb)->hop_limit; | |
| 46 | ||
| 47 | /* flowlabel and prio (includes version, which shouldn't change either */ | |
| 48 | flowlabel = *((u32 *)ipv6_hdr(skb)); | |
| 49 | ||
| 0ca743a5 | 50 | ret = nft_do_chain_pktinfo(&pkt, ops); |
| 96518518 PM |
51 | if (ret != NF_DROP && ret != NF_QUEUE && |
| 52 | (memcmp(&ipv6_hdr(skb)->saddr, &saddr, sizeof(saddr)) || | |
| 53 | memcmp(&ipv6_hdr(skb)->daddr, &daddr, sizeof(daddr)) || | |
| 54 | skb->mark != mark || | |
| 55 | ipv6_hdr(skb)->hop_limit != hop_limit || | |
| 56 | flowlabel != *((u_int32_t *)ipv6_hdr(skb)))) | |
| 57 | return ip6_route_me_harder(skb) == 0 ? ret : NF_DROP; | |
| 58 | ||
| 59 | return ret; | |
| 60 | } | |
| 61 | ||
| 9370761c PNA |
62 | static struct nf_chain_type nft_chain_route_ipv6 = { |
| 63 | .family = NFPROTO_IPV6, | |
| 64 | .name = "route", | |
| 65 | .type = NFT_CHAIN_T_ROUTE, | |
| 66 | .hook_mask = (1 << NF_INET_LOCAL_OUT), | |
| 67 | .fn = { | |
| 68 | [NF_INET_LOCAL_OUT] = nf_route_table_hook, | |
| 69 | }, | |
| 70 | .me = THIS_MODULE, | |
| 96518518 PM |
71 | }; |
| 72 | ||
| 9370761c | 73 | static int __init nft_chain_route_init(void) |
| 96518518 | 74 | { |
| 9370761c | 75 | return nft_register_chain_type(&nft_chain_route_ipv6); |
| 96518518 PM |
76 | } |
| 77 | ||
| 9370761c | 78 | static void __exit nft_chain_route_exit(void) |
| 96518518 | 79 | { |
| 9370761c | 80 | nft_unregister_chain_type(&nft_chain_route_ipv6); |
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81 | } |
| 82 | ||
| 9370761c PNA |
83 | module_init(nft_chain_route_init); |
| 84 | module_exit(nft_chain_route_exit); | |
| 96518518 PM |
85 | |
| 86 | MODULE_LICENSE("GPL"); | |
| 87 | MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); | |
| 9370761c | 88 | MODULE_ALIAS_NFT_CHAIN(AF_INET6, "route"); |