/*
   *	xt_mark - Netfilter module to match NFMARK value
   *
   *	(C) 1999-2001 Marc Boucher <marc@mbsi.ca>
   *	Copyright © CC Computer Consultants GmbH, 2007 - 2008

   *	Jan Engelhardt <jengelh@medozas.de>

   *

   *	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/skbuff.h>

  #include <linux/netfilter/xt_mark.h>
  #include <linux/netfilter/x_tables.h>

  
  MODULE_LICENSE("GPL");
  MODULE_AUTHOR("Marc Boucher <marc@mbsi.ca>");

  MODULE_DESCRIPTION("Xtables: packet mark operations");

  MODULE_ALIAS("ipt_mark");
  MODULE_ALIAS("ip6t_mark");

  MODULE_ALIAS("ipt_MARK");
  MODULE_ALIAS("ip6t_MARK");

  MODULE_ALIAS("arpt_MARK");

  
  static unsigned int

  mark_tg(struct sk_buff *skb, const struct xt_action_param *par)

  {
  	const struct xt_mark_tginfo2 *info = par->targinfo;
  
  	skb->mark = (skb->mark & ~info->mask) ^ info->mark;
  	return XT_CONTINUE;
  }

  static bool

  mark_mt(const struct sk_buff *skb, struct xt_action_param *par)

  {

  	const struct xt_mark_mtinfo1 *info = par->matchinfo;

  	return ((skb->mark & info->mask) == info->mark) ^ info->invert;

  }

  static struct xt_target mark_tg_reg __read_mostly = {
  	.name           = "MARK",
  	.revision       = 2,
  	.family         = NFPROTO_UNSPEC,
  	.target         = mark_tg,
  	.targetsize     = sizeof(struct xt_mark_tginfo2),
  	.me             = THIS_MODULE,
  };

  static struct xt_match mark_mt_reg __read_mostly = {
  	.name           = "mark",
  	.revision       = 1,
  	.family         = NFPROTO_UNSPEC,
  	.match          = mark_mt,
  	.matchsize      = sizeof(struct xt_mark_mtinfo1),
  	.me             = THIS_MODULE,

  };

  static int __init mark_mt_init(void)

  {

  	int ret;
  
  	ret = xt_register_target(&mark_tg_reg);
  	if (ret < 0)
  		return ret;
  	ret = xt_register_match(&mark_mt_reg);
  	if (ret < 0) {
  		xt_unregister_target(&mark_tg_reg);
  		return ret;
  	}
  	return 0;

  }

  static void __exit mark_mt_exit(void)

  {

  	xt_unregister_match(&mark_mt_reg);

  	xt_unregister_target(&mark_tg_reg);

  }

  module_init(mark_mt_init);
  module_exit(mark_mt_exit);