kernel/net/ipv6/netfilter/nft_chain_nat_ipv6.c

   1 /*
   2  * Copyright (c) 2011 Patrick McHardy <kaber@trash.net>
   3  * Copyright (c) 2012 Intel Corporation
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms and conditions of the GNU General Public License,
   7  * version 2, as published by the Free Software Foundation.
   8  *
   9  */
  10
  11 #include <linux/module.h>
  12 #include <linux/init.h>
  13 #include <linux/list.h>
  14 #include <linux/skbuff.h>
  15 #include <linux/ip.h>
  16 #include <linux/netfilter.h>
  17 #include <linux/netfilter_ipv6.h>
  18 #include <linux/netfilter/nf_tables.h>
  19 #include <net/netfilter/nf_conntrack.h>
  20 #include <net/netfilter/nf_nat.h>
  21 #include <net/netfilter/nf_nat_core.h>
  22 #include <net/netfilter/nf_tables.h>
  23 #include <net/netfilter/nf_tables_ipv6.h>
  24 #include <net/netfilter/nf_nat_l3proto.h>
  25 #include <net/ipv6.h>
  26
  27 static unsigned int nft_nat_do_chain(const struct nf_hook_ops *ops,
  28                                      struct sk_buff *skb,
  29                                      const struct nf_hook_state *state,
  30                                      struct nf_conn *ct)
  31 {
  32         struct nft_pktinfo pkt;
  33
  34         nft_set_pktinfo_ipv6(&pkt, ops, skb, state);
  35
  36         return nft_do_chain(&pkt, ops);
  37 }
  38
  39 static unsigned int nft_nat_ipv6_fn(const struct nf_hook_ops *ops,
  40                                     struct sk_buff *skb,
  41                                     const struct nf_hook_state *state)
  42 {
  43         return nf_nat_ipv6_fn(ops, skb, state, nft_nat_do_chain);
  44 }
  45
  46 static unsigned int nft_nat_ipv6_in(const struct nf_hook_ops *ops,
  47                                     struct sk_buff *skb,
  48                                     const struct nf_hook_state *state)
  49 {
  50         return nf_nat_ipv6_in(ops, skb, state, nft_nat_do_chain);
  51 }
  52
  53 static unsigned int nft_nat_ipv6_out(const struct nf_hook_ops *ops,
  54                                      struct sk_buff *skb,
  55                                      const struct nf_hook_state *state)
  56 {
  57         return nf_nat_ipv6_out(ops, skb, state, nft_nat_do_chain);
  58 }
  59
  60 static unsigned int nft_nat_ipv6_local_fn(const struct nf_hook_ops *ops,
  61                                           struct sk_buff *skb,
  62                                           const struct nf_hook_state *state)
  63 {
  64         return nf_nat_ipv6_local_fn(ops, skb, state, nft_nat_do_chain);
  65 }
  66
  67 static const struct nf_chain_type nft_chain_nat_ipv6 = {
  68         .name           = "nat",
  69         .type           = NFT_CHAIN_T_NAT,
  70         .family         = NFPROTO_IPV6,
  71         .owner          = THIS_MODULE,
  72         .hook_mask      = (1 << NF_INET_PRE_ROUTING) |
  73                           (1 << NF_INET_POST_ROUTING) |
  74                           (1 << NF_INET_LOCAL_OUT) |
  75                           (1 << NF_INET_LOCAL_IN),
  76         .hooks          = {
  77                 [NF_INET_PRE_ROUTING]   = nft_nat_ipv6_in,
  78                 [NF_INET_POST_ROUTING]  = nft_nat_ipv6_out,
  79                 [NF_INET_LOCAL_OUT]     = nft_nat_ipv6_local_fn,
  80                 [NF_INET_LOCAL_IN]      = nft_nat_ipv6_fn,
  81         },
  82 };
  83
  84 static int __init nft_chain_nat_ipv6_init(void)
  85 {
  86         int err;
  87
  88         err = nft_register_chain_type(&nft_chain_nat_ipv6);
  89         if (err < 0)
  90                 return err;
  91
  92         return 0;
  93 }
  94
  95 static void __exit nft_chain_nat_ipv6_exit(void)
  96 {
  97         nft_unregister_chain_type(&nft_chain_nat_ipv6);
  98 }
  99
 100 module_init(nft_chain_nat_ipv6_init);
 101 module_exit(nft_chain_nat_ipv6_exit);
 102
 103 MODULE_LICENSE("GPL");
 104 MODULE_AUTHOR("Tomasz Bursztyka <tomasz.bursztyka@linux.intel.com>");
 105 MODULE_ALIAS_NFT_CHAIN(AF_INET6, "nat");