kernel/2.6.29.6-aldebaran-rt/net/bridge/netfilter/ebt_mark_m.c

   1 /*
   2  *  ebt_mark_m
   3  *
   4  *      Authors:
   5  *      Bart De Schuymer <bdschuym@pandora.be>
   6  *
   7  *  July, 2002
   8  *
   9  */
  10 #include <linux/module.h>
  11 #include <linux/netfilter/x_tables.h>
  12 #include <linux/netfilter_bridge/ebtables.h>
  13 #include <linux/netfilter_bridge/ebt_mark_m.h>
  14
  15 static bool
  16 ebt_mark_mt(const struct sk_buff *skb, const struct xt_match_param *par)
  17 {
  18         const struct ebt_mark_m_info *info = par->matchinfo;
  19
  20         if (info->bitmask & EBT_MARK_OR)
  21                 return !!(skb->mark & info->mask) ^ info->invert;
  22         return ((skb->mark & info->mask) == info->mark) ^ info->invert;
  23 }
  24
  25 static bool ebt_mark_mt_check(const struct xt_mtchk_param *par)
  26 {
  27         const struct ebt_mark_m_info *info = par->matchinfo;
  28
  29         if (info->bitmask & ~EBT_MARK_MASK)
  30                 return false;
  31         if ((info->bitmask & EBT_MARK_OR) && (info->bitmask & EBT_MARK_AND))
  32                 return false;
  33         if (!info->bitmask)
  34                 return false;
  35         return true;
  36 }
  37
  38 static struct xt_match ebt_mark_mt_reg __read_mostly = {
  39         .name           = "mark_m",
  40         .revision       = 0,
  41         .family         = NFPROTO_BRIDGE,
  42         .match          = ebt_mark_mt,
  43         .checkentry     = ebt_mark_mt_check,
  44         .matchsize      = XT_ALIGN(sizeof(struct ebt_mark_m_info)),
  45         .me             = THIS_MODULE,
  46 };
  47
  48 static int __init ebt_mark_m_init(void)
  49 {
  50         return xt_register_match(&ebt_mark_mt_reg);
  51 }
  52
  53 static void __exit ebt_mark_m_fini(void)
  54 {
  55         xt_unregister_match(&ebt_mark_mt_reg);
  56 }
  57
  58 module_init(ebt_mark_m_init);
  59 module_exit(ebt_mark_m_fini);
  60 MODULE_DESCRIPTION("Ebtables: Packet mark match");
  61 MODULE_LICENSE("GPL");