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