net/ipv6/netfilter/nf_tables_ipv6.c

   1 /*
   2  * Copyright (c) 2008 Patrick McHardy <kaber@trash.net>
   3  * Copyright (c) 2012-2013 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/init.h>
  13 #include <linux/module.h>
  14 #include <linux/ipv6.h>
  15 #include <linux/netfilter_ipv6.h>
  16 #include <net/netfilter/nf_tables.h>
  17 #include <net/netfilter/nf_tables_ipv6.h>
  18
  19 static unsigned int nft_ipv6_output(const struct nf_hook_ops *ops,
  20                                     struct sk_buff *skb,
  21                                     const struct net_device *in,
  22                                     const struct net_device *out,
  23                                     int (*okfn)(struct sk_buff *))
  24 {
  25         struct nft_pktinfo pkt;
  26
  27         if (unlikely(skb->len < sizeof(struct ipv6hdr))) {
  28                 if (net_ratelimit())
  29                         pr_info("nf_tables_ipv6: ignoring short SOCK_RAW "
  30                                 "packet\n");
  31                 return NF_ACCEPT;
  32         }
  33         if (nft_set_pktinfo_ipv6(&pkt, ops, skb, in, out) < 0)
  34                 return NF_DROP;
  35
  36         return nft_do_chain_pktinfo(&pkt, ops);
  37 }
  38
  39 static struct nft_af_info nft_af_ipv6 __read_mostly = {
  40         .family         = NFPROTO_IPV6,
  41         .nhooks         = NF_INET_NUMHOOKS,
  42         .owner          = THIS_MODULE,
  43         .hooks          = {
  44                 [NF_INET_LOCAL_OUT]     = nft_ipv6_output,
  45         },
  46 };
  47
  48 static unsigned int
  49 nft_do_chain_ipv6(const struct nf_hook_ops *ops,
  50                   struct sk_buff *skb,
  51                   const struct net_device *in,
  52                   const struct net_device *out,
  53                   int (*okfn)(struct sk_buff *))
  54 {
  55         struct nft_pktinfo pkt;
  56
  57         /* malformed packet, drop it */
  58         if (nft_set_pktinfo_ipv6(&pkt, ops, skb, in, out) < 0)
  59                 return NF_DROP;
  60
  61         return nft_do_chain_pktinfo(&pkt, ops);
  62 }
  63
  64 static struct nf_chain_type filter_ipv6 = {
  65         .family         = NFPROTO_IPV6,
  66         .name           = "filter",
  67         .type           = NFT_CHAIN_T_DEFAULT,
  68         .hook_mask      = (1 << NF_INET_LOCAL_IN) |
  69                           (1 << NF_INET_LOCAL_OUT) |
  70                           (1 << NF_INET_FORWARD) |
  71                           (1 << NF_INET_PRE_ROUTING) |
  72                           (1 << NF_INET_POST_ROUTING),
  73         .fn             = {
  74                 [NF_INET_LOCAL_IN]      = nft_do_chain_ipv6,
  75                 [NF_INET_LOCAL_OUT]     = nft_ipv6_output,
  76                 [NF_INET_FORWARD]       = nft_do_chain_ipv6,
  77                 [NF_INET_PRE_ROUTING]   = nft_do_chain_ipv6,
  78                 [NF_INET_POST_ROUTING]  = nft_do_chain_ipv6,
  79         },
  80 };
  81
  82 static int __init nf_tables_ipv6_init(void)
  83 {
  84         nft_register_chain_type(&filter_ipv6);
  85         return nft_register_afinfo(&nft_af_ipv6);
  86 }
  87 static void __exit nf_tables_ipv6_exit(void)
  88 {
  89         nft_unregister_afinfo(&nft_af_ipv6);
  90         nft_unregister_chain_type(&filter_ipv6);
  91 }
  92
  93 module_init(nf_tables_ipv6_init);
  94 module_exit(nf_tables_ipv6_exit);
  95
  96 MODULE_LICENSE("GPL");
  97 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
  98 MODULE_ALIAS_NFT_FAMILY(AF_INET6);