/*
   * Transparent proxy support for Linux/iptables
   *
   * Copyright (c) 2006-2007 BalaBit IT Ltd.
   * Author: Balazs Scheidler, Krisztian Kovacs
   *
   * This program is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License version 2 as
   * published by the Free Software Foundation.
   *
   */

  #include <linux/module.h>
  
  #include <linux/net.h>
  #include <linux/if.h>
  #include <linux/netdevice.h>
  #include <net/udp.h>
  #include <net/netfilter/nf_tproxy_core.h>

  
  static void
  nf_tproxy_destructor(struct sk_buff *skb)
  {
  	struct sock *sk = skb->sk;
  
  	skb->sk = NULL;
  	skb->destructor = NULL;
  
  	if (sk)

  		sock_put(sk);

  }
  
  /* consumes sk */

  void

  nf_tproxy_assign_sock(struct sk_buff *skb, struct sock *sk)
  {

  	/* assigning tw sockets complicates things; most
  	 * skb->sk->X checks would have to test sk->sk_state first */
  	if (sk->sk_state == TCP_TIME_WAIT) {
  		inet_twsk_put(inet_twsk(sk));
  		return;
  	}
  
  	skb_orphan(skb);
  	skb->sk = sk;
  	skb->destructor = nf_tproxy_destructor;

  }
  EXPORT_SYMBOL_GPL(nf_tproxy_assign_sock);
  
  static int __init nf_tproxy_init(void)
  {
  	pr_info("NF_TPROXY: Transparent proxy support initialized, version 4.1.0
  ");
  	pr_info("NF_TPROXY: Copyright (c) 2006-2007 BalaBit IT Ltd.
  ");
  	return 0;
  }
  
  module_init(nf_tproxy_init);
  
  MODULE_LICENSE("GPL");
  MODULE_AUTHOR("Krisztian Kovacs");
  MODULE_DESCRIPTION("Transparent proxy support core routines");