linux/net/netfilter/nf_tproxy_core.c
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   1/*
   2 * Transparent proxy support for Linux/iptables
   3 *
   4 * Copyright (c) 2006-2007 BalaBit IT Ltd.
   5 * Author: Balazs Scheidler, Krisztian Kovacs
   6 *
   7 * This program is free software; you can redistribute it and/or modify
   8 * it under the terms of the GNU General Public License version 2 as
   9 * published by the Free Software Foundation.
  10 *
  11 */
  12
  13#include <linux/module.h>
  14
  15#include <linux/net.h>
  16#include <linux/if.h>
  17#include <linux/netdevice.h>
  18#include <net/udp.h>
  19#include <net/netfilter/nf_tproxy_core.h>
  20
  21
  22static void
  23nf_tproxy_destructor(struct sk_buff *skb)
  24{
  25        struct sock *sk = skb->sk;
  26
  27        skb->sk = NULL;
  28        skb->destructor = NULL;
  29
  30        if (sk)
  31                sock_put(sk);
  32}
  33
  34/* consumes sk */
  35void
  36nf_tproxy_assign_sock(struct sk_buff *skb, struct sock *sk)
  37{
  38        /* assigning tw sockets complicates things; most
  39         * skb->sk->X checks would have to test sk->sk_state first */
  40        if (sk->sk_state == TCP_TIME_WAIT) {
  41                inet_twsk_put(inet_twsk(sk));
  42                return;
  43        }
  44
  45        skb_orphan(skb);
  46        skb->sk = sk;
  47        skb->destructor = nf_tproxy_destructor;
  48}
  49EXPORT_SYMBOL_GPL(nf_tproxy_assign_sock);
  50
  51static int __init nf_tproxy_init(void)
  52{
  53        pr_info("NF_TPROXY: Transparent proxy support initialized, version 4.1.0\n");
  54        pr_info("NF_TPROXY: Copyright (c) 2006-2007 BalaBit IT Ltd.\n");
  55        return 0;
  56}
  57
  58module_init(nf_tproxy_init);
  59
  60MODULE_LICENSE("GPL");
  61MODULE_AUTHOR("Krisztian Kovacs");
  62MODULE_DESCRIPTION("Transparent proxy support core routines");
  63
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