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Linux/net/ipv6/netfilter/nft_chain_route_ipv6.c

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  1 /*
  2  * Copyright (c) 2008 Patrick McHardy <kaber@trash.net>
  3  * Copyright (c) 2012 Pablo Neira Ayuso <pablo@netfilter.org>
  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>
 22 #include <net/netfilter/nf_tables_ipv6.h>
 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 nf_hook_state *state)
 28 {
 29         unsigned int ret;
 30         struct nft_pktinfo pkt;
 31         struct in6_addr saddr, daddr;
 32         u_int8_t hop_limit;
 33         u32 mark, flowlabel;
 34 
 35         /* malformed packet, drop it */
 36         if (nft_set_pktinfo_ipv6(&pkt, ops, skb, state) < 0)
 37                 return NF_DROP;
 38 
 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 
 48         ret = nft_do_chain(&pkt, ops);
 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 
 60 static const struct nf_chain_type nft_chain_route_ipv6 = {
 61         .name           = "route",
 62         .type           = NFT_CHAIN_T_ROUTE,
 63         .family         = NFPROTO_IPV6,
 64         .owner          = THIS_MODULE,
 65         .hook_mask      = (1 << NF_INET_LOCAL_OUT),
 66         .hooks          = {
 67                 [NF_INET_LOCAL_OUT]     = nf_route_table_hook,
 68         },
 69 };
 70 
 71 static int __init nft_chain_route_init(void)
 72 {
 73         return nft_register_chain_type(&nft_chain_route_ipv6);
 74 }
 75 
 76 static void __exit nft_chain_route_exit(void)
 77 {
 78         nft_unregister_chain_type(&nft_chain_route_ipv6);
 79 }
 80 
 81 module_init(nft_chain_route_init);
 82 module_exit(nft_chain_route_exit);
 83 
 84 MODULE_LICENSE("GPL");
 85 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
 86 MODULE_ALIAS_NFT_CHAIN(AF_INET6, "route");
 87 

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