LXR linux/net/ipv6/netfilter/nft_chain_nat

   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
  27static 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
  39static 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
  46static 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
  53static 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
  60static 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
  67static 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
  84static 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
  95static void __exit nft_chain_nat_ipv6_exit(void)
  96{
  97        nft_unregister_chain_type(&nft_chain_nat_ipv6);
  98}
  99
 100module_init(nft_chain_nat_ipv6_init);
 101module_exit(nft_chain_nat_ipv6_exit);
 102
 103MODULE_LICENSE("GPL");
 104MODULE_AUTHOR("Tomasz Bursztyka <tomasz.bursztyka@linux.intel.com>");
 105MODULE_ALIAS_NFT_CHAIN(AF_INET6, "nat");
 106