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