kernel/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(const struct nf_hook_ops *ops,
  30                                       struct sk_buff *skb,
  31                                       const struct nf_hook_state *state,
  32                                       struct nf_conn *ct)
  33 {
  34         struct nft_pktinfo pkt;
  35
  36         nft_set_pktinfo_ipv4(&pkt, ops, skb, state);
  37
  38         return nft_do_chain(&pkt, ops);
  39 }
  40
  41 static unsigned int nft_nat_ipv4_fn(const struct nf_hook_ops *ops,
  42                                     struct sk_buff *skb,
  43                                     const struct nf_hook_state *state)
  44 {
  45         return nf_nat_ipv4_fn(ops, skb, state, nft_nat_do_chain);
  46 }
  47
  48 static unsigned int nft_nat_ipv4_in(const struct nf_hook_ops *ops,
  49                                     struct sk_buff *skb,
  50                                     const struct nf_hook_state *state)
  51 {
  52         return nf_nat_ipv4_in(ops, skb, state, nft_nat_do_chain);
  53 }
  54
  55 static unsigned int nft_nat_ipv4_out(const struct nf_hook_ops *ops,
  56                                      struct sk_buff *skb,
  57                                      const struct nf_hook_state *state)
  58 {
  59         return nf_nat_ipv4_out(ops, skb, state, nft_nat_do_chain);
  60 }
  61
  62 static unsigned int nft_nat_ipv4_local_fn(const struct nf_hook_ops *ops,
  63                                           struct sk_buff *skb,
  64                                           const struct nf_hook_state *state)
  65 {
  66         return nf_nat_ipv4_local_fn(ops, skb, state, nft_nat_do_chain);
  67 }
  68
  69 static const struct nf_chain_type nft_chain_nat_ipv4 = {
  70         .name           = "nat",
  71         .type           = NFT_CHAIN_T_NAT,
  72         .family         = NFPROTO_IPV4,
  73         .owner          = THIS_MODULE,
  74         .hook_mask      = (1 << NF_INET_PRE_ROUTING) |
  75                           (1 << NF_INET_POST_ROUTING) |
  76                           (1 << NF_INET_LOCAL_OUT) |
  77                           (1 << NF_INET_LOCAL_IN),
  78         .hooks          = {
  79                 [NF_INET_PRE_ROUTING]   = nft_nat_ipv4_in,
  80                 [NF_INET_POST_ROUTING]  = nft_nat_ipv4_out,
  81                 [NF_INET_LOCAL_OUT]     = nft_nat_ipv4_local_fn,
  82                 [NF_INET_LOCAL_IN]      = nft_nat_ipv4_fn,
  83         },
  84 };
  85
  86 static int __init nft_chain_nat_init(void)
  87 {
  88         int err;
  89
  90         err = nft_register_chain_type(&nft_chain_nat_ipv4);
  91         if (err < 0)
  92                 return err;
  93
  94         return 0;
  95 }
  96
  97 static void __exit nft_chain_nat_exit(void)
  98 {
  99         nft_unregister_chain_type(&nft_chain_nat_ipv4);
 100 }
 101
 102 module_init(nft_chain_nat_init);
 103 module_exit(nft_chain_nat_exit);
 104
 105 MODULE_LICENSE("GPL");
 106 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
 107 MODULE_ALIAS_NFT_CHAIN(AF_INET, "nat");