release/src-rt-6.x.4708/linux/linux-2.6.36/net/netfilter/xt_mark.c

   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
  19 MODULE_LICENSE("GPL");
  20 MODULE_AUTHOR("Marc Boucher <marc@mbsi.ca>");
  21 MODULE_DESCRIPTION("Xtables: packet mark operations");
  22 MODULE_ALIAS("ipt_mark");
  23 MODULE_ALIAS("ip6t_mark");
  24 MODULE_ALIAS("ipt_MARK");
  25 MODULE_ALIAS("ip6t_MARK");
  26
  27 static unsigned int
  28 mark_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
  36 static bool
  37 mark_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
  44 static 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
  53 static 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
  62 static 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
  77 static void __exit mark_mt_exit(void)
  78 {
  79         xt_unregister_match(&mark_mt_reg);
  80         xt_unregister_target(&mark_tg_reg);
  81 }
  82
  83 module_init(mark_mt_init);
  84 module_exit(mark_mt_exit);