release/src-rt-6.x.4708/linux/linux-2.6.36/net/sched/sch_blackhole.c

   1 /*
   2  * net/sched/sch_blackhole.c    Black hole queue
   3  *
   4  *              This program is free software; you can redistribute it and/or
   5  *              modify it under the terms of the GNU General Public License
   6  *              as published by the Free Software Foundation; either version
   7  *              2 of the License, or (at your option) any later version.
   8  *
   9  * Authors:     Thomas Graf <tgraf@suug.ch>
  10  *
  11  * Note: Quantum tunneling is not supported.
  12  */
  13
  14 #include <linux/module.h>
  15 #include <linux/types.h>
  16 #include <linux/kernel.h>
  17 #include <linux/skbuff.h>
  18 #include <net/pkt_sched.h>
  19
  20 static int blackhole_enqueue(struct sk_buff *skb, struct Qdisc *sch)
  21 {
  22         qdisc_drop(skb, sch);
  23         return NET_XMIT_SUCCESS;
  24 }
  25
  26 static struct sk_buff *blackhole_dequeue(struct Qdisc *sch)
  27 {
  28         return NULL;
  29 }
  30
  31 static struct Qdisc_ops blackhole_qdisc_ops __read_mostly = {
  32         .id             = "blackhole",
  33         .priv_size      = 0,
  34         .enqueue        = blackhole_enqueue,
  35         .dequeue        = blackhole_dequeue,
  36         .peek           = blackhole_dequeue,
  37         .owner          = THIS_MODULE,
  38 };
  39
  40 static int __init blackhole_module_init(void)
  41 {
  42         return register_qdisc(&blackhole_qdisc_ops);
  43 }
  44
  45 static void __exit blackhole_module_exit(void)
  46 {
  47         unregister_qdisc(&blackhole_qdisc_ops);
  48 }
  49
  50 module_init(blackhole_module_init)
  51 module_exit(blackhole_module_exit)
  52
  53 MODULE_LICENSE("GPL");