net/ipv4/netfilter/nft_chain_nat_ipv4.c

   1 /*
   2  * Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net>
   3  * Copyright (c) 2012 Pablo Neira Ayuso <pablo@netfilter.org>
   4  * Copyright (c) 2012 Intel Corporation
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  *
  10  * Development of this code funded by Astaro AG (http://www.astaro.com/)
  11  */
  12
  13 #include <linux/module.h>
  14 #include <linux/init.h>
  15 #include <linux/list.h>
  16 #include <linux/skbuff.h>
  17 #include <linux/ip.h>
  18 #include <linux/netfilter.h>
  19 #include <linux/netfilter_ipv4.h>
  20 #include <linux/netfilter/nf_tables.h>
  21 #include <net/netfilter/nf_conntrack.h>
  22 #include <net/netfilter/nf_nat.h>
  23 #include <net/netfilter/nf_nat_core.h>
  24 #include <net/netfilter/nf_tables.h>
  25 #include <net/netfilter/nf_tables_ipv4.h>
  26 #include <net/netfilter/nf_nat_l3proto.h>
  27 #include <net/ip.h>
  28
  29 static unsigned int nft_nat_do_chain(void *priv,
  30                                      struct sk_buff *skb,
  31                                      const struct nf_hook_state *state)
  32 {
  33         struct nft_pktinfo pkt;
  34
  35         nft_set_pktinfo(&pkt, skb, state);
  36         nft_set_pktinfo_ipv4(&pkt, skb);
  37
  38         return nft_do_chain(&pkt, priv);
  39 }
  40
  41 static int nft_nat_ipv4_reg(struct net *net, const struct nf_hook_ops *ops)
  42 {
  43         return nf_nat_l3proto_ipv4_register_fn(net, ops);
  44 }
  45
  46 static void nft_nat_ipv4_unreg(struct net *net, const struct nf_hook_ops *ops)
  47 {
  48         nf_nat_l3proto_ipv4_unregister_fn(net, ops);
  49 }
  50
  51 static const struct nft_chain_type nft_chain_nat_ipv4 = {
  52         .name           = "nat",
  53         .type           = NFT_CHAIN_T_NAT,
  54         .family         = NFPROTO_IPV4,
  55         .owner          = THIS_MODULE,
  56         .hook_mask      = (1 << NF_INET_PRE_ROUTING) |
  57                           (1 << NF_INET_POST_ROUTING) |
  58                           (1 << NF_INET_LOCAL_OUT) |
  59                           (1 << NF_INET_LOCAL_IN),
  60         .hooks          = {
  61                 [NF_INET_PRE_ROUTING]   = nft_nat_do_chain,
  62                 [NF_INET_POST_ROUTING]  = nft_nat_do_chain,
  63                 [NF_INET_LOCAL_OUT]     = nft_nat_do_chain,
  64                 [NF_INET_LOCAL_IN]      = nft_nat_do_chain,
  65         },
  66         .ops_register = nft_nat_ipv4_reg,
  67         .ops_unregister = nft_nat_ipv4_unreg,
  68 };
  69
  70 static int __init nft_chain_nat_init(void)
  71 {
  72         nft_register_chain_type(&nft_chain_nat_ipv4);
  73
  74         return 0;
  75 }
  76
  77 static void __exit nft_chain_nat_exit(void)
  78 {
  79         nft_unregister_chain_type(&nft_chain_nat_ipv4);
  80 }
  81
  82 module_init(nft_chain_nat_init);
  83 module_exit(nft_chain_nat_exit);
  84
  85 MODULE_LICENSE("GPL");
  86 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
  87 MODULE_ALIAS_NFT_CHAIN(AF_INET, "nat");