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