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 net_device *in,
  32                                       const struct net_device *out,
  33                                       struct nf_conn *ct)
  34 {
  35         struct nft_pktinfo pkt;
  36
  37         nft_set_pktinfo_ipv4(&pkt, ops, skb, in, out);
  38
  39         return nft_do_chain(&pkt, ops);
  40 }
  41
  42 static unsigned int nft_nat_ipv4_fn(const struct nf_hook_ops *ops,
  43                                     struct sk_buff *skb,
  44                                     const struct net_device *in,
  45                                     const struct net_device *out,
  46                                     int (*okfn)(struct sk_buff *))
  47 {
  48         return nf_nat_ipv4_fn(ops, skb, in, out, nft_nat_do_chain);
  49 }
  50
  51 static unsigned int nft_nat_ipv4_in(const struct nf_hook_ops *ops,
  52                                     struct sk_buff *skb,
  53                                     const struct net_device *in,
  54                                     const struct net_device *out,
  55                                     int (*okfn)(struct sk_buff *))
  56 {
  57         return nf_nat_ipv4_in(ops, skb, in, out, nft_nat_do_chain);
  58 }
  59
  60 static unsigned int nft_nat_ipv4_out(const struct nf_hook_ops *ops,
  61                                      struct sk_buff *skb,
  62                                      const struct net_device *in,
  63                                      const struct net_device *out,
  64                                      int (*okfn)(struct sk_buff *))
  65 {
  66         return nf_nat_ipv4_out(ops, skb, in, out, nft_nat_do_chain);
  67 }
  68
  69 static unsigned int nft_nat_ipv4_local_fn(const struct nf_hook_ops *ops,
  70                                           struct sk_buff *skb,
  71                                           const struct net_device *in,
  72                                           const struct net_device *out,
  73                                           int (*okfn)(struct sk_buff *))
  74 {
  75         return nf_nat_ipv4_local_fn(ops, skb, in, out, nft_nat_do_chain);
  76 }
  77
  78 static const struct nf_chain_type nft_chain_nat_ipv4 = {
  79         .name           = "nat",
  80         .type           = NFT_CHAIN_T_NAT,
  81         .family         = NFPROTO_IPV4,
  82         .owner          = THIS_MODULE,
  83         .hook_mask      = (1 << NF_INET_PRE_ROUTING) |
  84                           (1 << NF_INET_POST_ROUTING) |
  85                           (1 << NF_INET_LOCAL_OUT) |
  86                           (1 << NF_INET_LOCAL_IN),
  87         .hooks          = {
  88                 [NF_INET_PRE_ROUTING]   = nft_nat_ipv4_in,
  89                 [NF_INET_POST_ROUTING]  = nft_nat_ipv4_out,
  90                 [NF_INET_LOCAL_OUT]     = nft_nat_ipv4_local_fn,
  91                 [NF_INET_LOCAL_IN]      = nft_nat_ipv4_fn,
  92         },
  93 };
  94
  95 static int __init nft_chain_nat_init(void)
  96 {
  97         int err;
  98
  99         err = nft_register_chain_type(&nft_chain_nat_ipv4);
 100         if (err < 0)
 101                 return err;
 102
 103         return 0;
 104 }
 105
 106 static void __exit nft_chain_nat_exit(void)
 107 {
 108         nft_unregister_chain_type(&nft_chain_nat_ipv4);
 109 }
 110
 111 module_init(nft_chain_nat_init);
 112 module_exit(nft_chain_nat_exit);
 113
 114 MODULE_LICENSE("GPL");
 115 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
 116 MODULE_ALIAS_NFT_CHAIN(AF_INET, "nat");