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 int nf_tables_ipv6_init_net(struct net *net)
  49 {
  50         net->nft.ipv6 = kmalloc(sizeof(struct nft_af_info), GFP_KERNEL);
  51         if (net->nft.ipv6 == NULL)
  52                 return -ENOMEM;
  53
  54         memcpy(net->nft.ipv6, &nft_af_ipv6, sizeof(nft_af_ipv6));
  55
  56         if (nft_register_afinfo(net, net->nft.ipv6) < 0)
  57                 goto err;
  58
  59         return 0;
  60 err:
  61         kfree(net->nft.ipv6);
  62         return -ENOMEM;
  63 }
  64
  65 static void nf_tables_ipv6_exit_net(struct net *net)
  66 {
  67         nft_unregister_afinfo(net->nft.ipv6);
  68         kfree(net->nft.ipv6);
  69 }
  70
  71 static struct pernet_operations nf_tables_ipv6_net_ops = {
  72         .init   = nf_tables_ipv6_init_net,
  73         .exit   = nf_tables_ipv6_exit_net,
  74 };
  75
  76 static unsigned int
  77 nft_do_chain_ipv6(const struct nf_hook_ops *ops,
  78                   struct sk_buff *skb,
  79                   const struct net_device *in,
  80                   const struct net_device *out,
  81                   int (*okfn)(struct sk_buff *))
  82 {
  83         struct nft_pktinfo pkt;
  84
  85         /* malformed packet, drop it */
  86         if (nft_set_pktinfo_ipv6(&pkt, ops, skb, in, out) < 0)
  87                 return NF_DROP;
  88
  89         return nft_do_chain_pktinfo(&pkt, ops);
  90 }
  91
  92 static struct nf_chain_type filter_ipv6 = {
  93         .family         = NFPROTO_IPV6,
  94         .name           = "filter",
  95         .type           = NFT_CHAIN_T_DEFAULT,
  96         .hook_mask      = (1 << NF_INET_LOCAL_IN) |
  97                           (1 << NF_INET_LOCAL_OUT) |
  98                           (1 << NF_INET_FORWARD) |
  99                           (1 << NF_INET_PRE_ROUTING) |
 100                           (1 << NF_INET_POST_ROUTING),
 101         .fn             = {
 102                 [NF_INET_LOCAL_IN]      = nft_do_chain_ipv6,
 103                 [NF_INET_LOCAL_OUT]     = nft_ipv6_output,
 104                 [NF_INET_FORWARD]       = nft_do_chain_ipv6,
 105                 [NF_INET_PRE_ROUTING]   = nft_do_chain_ipv6,
 106                 [NF_INET_POST_ROUTING]  = nft_do_chain_ipv6,
 107         },
 108 };
 109
 110 static int __init nf_tables_ipv6_init(void)
 111 {
 112         nft_register_chain_type(&filter_ipv6);
 113         return register_pernet_subsys(&nf_tables_ipv6_net_ops);
 114 }
 115
 116 static void __exit nf_tables_ipv6_exit(void)
 117 {
 118         unregister_pernet_subsys(&nf_tables_ipv6_net_ops);
 119         nft_unregister_chain_type(&filter_ipv6);
 120 }
 121
 122 module_init(nf_tables_ipv6_init);
 123 module_exit(nf_tables_ipv6_exit);
 124
 125 MODULE_LICENSE("GPL");
 126 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
 127 MODULE_ALIAS_NFT_FAMILY(AF_INET6);