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/config.h>
  15 #include <linux/module.h>
  16 #include <linux/types.h>
  17 #include <linux/kernel.h>
  18 #include <linux/netdevice.h>
  19 #include <linux/skbuff.h>
  20 #include <net/pkt_sched.h>
  21
  22 static int blackhole_enqueue(struct sk_buff *skb, struct Qdisc *sch)
  23 {
  24         qdisc_drop(skb, sch);
  25         return NET_XMIT_SUCCESS;
  26 }
  27
  28 static struct sk_buff *blackhole_dequeue(struct Qdisc *sch)
  29 {
  30         return NULL;
  31 }
  32
  33 static struct Qdisc_ops blackhole_qdisc_ops = {
  34         .id             = "blackhole",
  35         .priv_size      = 0,
  36         .enqueue        = blackhole_enqueue,
  37         .dequeue        = blackhole_dequeue,
  38         .owner          = THIS_MODULE,
  39 };
  40
  41 static int __init blackhole_module_init(void)
  42 {
  43         return register_qdisc(&blackhole_qdisc_ops);
  44 }
  45
  46 static void __exit blackhole_module_exit(void)
  47 {
  48         unregister_qdisc(&blackhole_qdisc_ops);
  49 }
  50
  51 module_init(blackhole_module_init)
  52 module_exit(blackhole_module_exit)
  53
  54 MODULE_LICENSE("GPL");