LXR linux/net/netfilter/xt

   1/*
   2 *      xt_mark - Netfilter module to match NFMARK value
   3 *
   4 *      (C) 1999-2001 Marc Boucher <marc@mbsi.ca>
   5 *      Copyright © CC Computer Consultants GmbH, 2007 - 2008
   6 *      Jan Engelhardt <jengelh@medozas.de>
   7 *
   8 *      This program is free software; you can redistribute it and/or modify
   9 *      it under the terms of the GNU General Public License version 2 as
  10 *      published by the Free Software Foundation.
  11 */
  12
  13#include <linux/module.h>
  14#include <linux/skbuff.h>
  15
  16#include <linux/netfilter/xt_mark.h>
  17#include <linux/netfilter/x_tables.h>
  18
  19MODULE_LICENSE("GPL");
  20MODULE_AUTHOR("Marc Boucher <marc@mbsi.ca>");
  21MODULE_DESCRIPTION("Xtables: packet mark match");
  22MODULE_ALIAS("ipt_mark");
  23MODULE_ALIAS("ip6t_mark");
  24
  25static bool
  26mark_mt(const struct sk_buff *skb, const struct xt_match_param *par)
  27{
  28        const struct xt_mark_mtinfo1 *info = par->matchinfo;
  29
  30        return ((skb->mark & info->mask) == info->mark) ^ info->invert;
  31}
  32
  33static struct xt_match mark_mt_reg __read_mostly = {
  34        .name           = "mark",
  35        .revision       = 1,
  36        .family         = NFPROTO_UNSPEC,
  37        .match          = mark_mt,
  38        .matchsize      = sizeof(struct xt_mark_mtinfo1),
  39        .me             = THIS_MODULE,
  40};
  41
  42static int __init mark_mt_init(void)
  43{
  44        return xt_register_match(&mark_mt_reg);
  45}
  46
  47static void __exit mark_mt_exit(void)
  48{
  49        xt_unregister_match(&mark_mt_reg);
  50}
  51
  52module_init(mark_mt_init);
  53module_exit(mark_mt_exit);
  54