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 operations");
  22MODULE_ALIAS("ipt_mark");
  23MODULE_ALIAS("ip6t_mark");
  24MODULE_ALIAS("ipt_MARK");
  25MODULE_ALIAS("ip6t_MARK");
  26MODULE_ALIAS("arpt_MARK");
  27
  28static unsigned int
  29mark_tg(struct sk_buff *skb, const struct xt_action_param *par)
  30{
  31        const struct xt_mark_tginfo2 *info = par->targinfo;
  32
  33        skb->mark = (skb->mark & ~info->mask) ^ info->mark;
  34        return XT_CONTINUE;
  35}
  36
  37static bool
  38mark_mt(const struct sk_buff *skb, struct xt_action_param *par)
  39{
  40        const struct xt_mark_mtinfo1 *info = par->matchinfo;
  41
  42        return ((skb->mark & info->mask) == info->mark) ^ info->invert;
  43}
  44
  45static struct xt_target mark_tg_reg __read_mostly = {
  46        .name           = "MARK",
  47        .revision       = 2,
  48        .family         = NFPROTO_UNSPEC,
  49        .target         = mark_tg,
  50        .targetsize     = sizeof(struct xt_mark_tginfo2),
  51        .me             = THIS_MODULE,
  52};
  53
  54static struct xt_match mark_mt_reg __read_mostly = {
  55        .name           = "mark",
  56        .revision       = 1,
  57        .family         = NFPROTO_UNSPEC,
  58        .match          = mark_mt,
  59        .matchsize      = sizeof(struct xt_mark_mtinfo1),
  60        .me             = THIS_MODULE,
  61};
  62
  63static int __init mark_mt_init(void)
  64{
  65        int ret;
  66
  67        ret = xt_register_target(&mark_tg_reg);
  68        if (ret < 0)
  69                return ret;
  70        ret = xt_register_match(&mark_mt_reg);
  71        if (ret < 0) {
  72                xt_unregister_target(&mark_tg_reg);
  73                return ret;
  74        }
  75        return 0;
  76}
  77
  78static void __exit mark_mt_exit(void)
  79{
  80        xt_unregister_match(&mark_mt_reg);
  81        xt_unregister_target(&mark_tg_reg);
  82}
  83
  84module_init(mark_mt_init);
  85module_exit(mark_mt_exit);
  86