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_do_chain_ipv6(void *priv,
  20                                       struct sk_buff *skb,
  21                                       const struct nf_hook_state *state)
  22 {
  23         struct nft_pktinfo pkt;
  24
  25         nft_set_pktinfo_ipv6(&pkt, skb, state);
  26
  27         return nft_do_chain(&pkt, priv);
  28 }
  29
  30 static unsigned int nft_ipv6_output(void *priv,
  31                                     struct sk_buff *skb,
  32                                     const struct nf_hook_state *state)
  33 {
  34         if (unlikely(skb->len < sizeof(struct ipv6hdr))) {
  35                 if (net_ratelimit())
  36                         pr_info("nf_tables_ipv6: ignoring short SOCK_RAW "
  37                                 "packet\n");
  38                 return NF_ACCEPT;
  39         }
  40
  41         return nft_do_chain_ipv6(priv, skb, state);
  42 }
  43
  44 struct nft_af_info nft_af_ipv6 __read_mostly = {
  45         .family         = NFPROTO_IPV6,
  46         .nhooks         = NF_INET_NUMHOOKS,
  47         .owner          = THIS_MODULE,
  48         .nops           = 1,
  49         .hooks          = {
  50                 [NF_INET_LOCAL_IN]      = nft_do_chain_ipv6,
  51                 [NF_INET_LOCAL_OUT]     = nft_ipv6_output,
  52                 [NF_INET_FORWARD]       = nft_do_chain_ipv6,
  53                 [NF_INET_PRE_ROUTING]   = nft_do_chain_ipv6,
  54                 [NF_INET_POST_ROUTING]  = nft_do_chain_ipv6,
  55         },
  56 };
  57 EXPORT_SYMBOL_GPL(nft_af_ipv6);
  58
  59 static int nf_tables_ipv6_init_net(struct net *net)
  60 {
  61         net->nft.ipv6 = kmalloc(sizeof(struct nft_af_info), GFP_KERNEL);
  62         if (net->nft.ipv6 == NULL)
  63                 return -ENOMEM;
  64
  65         memcpy(net->nft.ipv6, &nft_af_ipv6, sizeof(nft_af_ipv6));
  66
  67         if (nft_register_afinfo(net, net->nft.ipv6) < 0)
  68                 goto err;
  69
  70         return 0;
  71 err:
  72         kfree(net->nft.ipv6);
  73         return -ENOMEM;
  74 }
  75
  76 static void nf_tables_ipv6_exit_net(struct net *net)
  77 {
  78         nft_unregister_afinfo(net, net->nft.ipv6);
  79         kfree(net->nft.ipv6);
  80 }
  81
  82 static struct pernet_operations nf_tables_ipv6_net_ops = {
  83         .init   = nf_tables_ipv6_init_net,
  84         .exit   = nf_tables_ipv6_exit_net,
  85 };
  86
  87 static const struct nf_chain_type filter_ipv6 = {
  88         .name           = "filter",
  89         .type           = NFT_CHAIN_T_DEFAULT,
  90         .family         = NFPROTO_IPV6,
  91         .owner          = THIS_MODULE,
  92         .hook_mask      = (1 << NF_INET_LOCAL_IN) |
  93                           (1 << NF_INET_LOCAL_OUT) |
  94                           (1 << NF_INET_FORWARD) |
  95                           (1 << NF_INET_PRE_ROUTING) |
  96                           (1 << NF_INET_POST_ROUTING),
  97 };
  98
  99 static int __init nf_tables_ipv6_init(void)
 100 {
 101         int ret;
 102
 103         ret = nft_register_chain_type(&filter_ipv6);
 104         if (ret < 0)
 105                 return ret;
 106
 107         ret = register_pernet_subsys(&nf_tables_ipv6_net_ops);
 108         if (ret < 0)
 109                 nft_unregister_chain_type(&filter_ipv6);
 110
 111         return ret;
 112 }
 113
 114 static void __exit nf_tables_ipv6_exit(void)
 115 {
 116         unregister_pernet_subsys(&nf_tables_ipv6_net_ops);
 117         nft_unregister_chain_type(&filter_ipv6);
 118 }
 119
 120 module_init(nf_tables_ipv6_init);
 121 module_exit(nf_tables_ipv6_exit);
 122
 123 MODULE_LICENSE("GPL");
 124 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
 125 MODULE_ALIAS_NFT_FAMILY(AF_INET6);