xref: /openbmc/linux/net/sched/sch_blackhole.c (revision 5a1ea477)
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/init.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 			     struct sk_buff **to_free)
22 {
23 	qdisc_drop(skb, sch, to_free);
24 	return NET_XMIT_SUCCESS | __NET_XMIT_BYPASS;
25 }
26 
27 static struct sk_buff *blackhole_dequeue(struct Qdisc *sch)
28 {
29 	return NULL;
30 }
31 
32 static struct Qdisc_ops blackhole_qdisc_ops __read_mostly = {
33 	.id		= "blackhole",
34 	.priv_size	= 0,
35 	.enqueue	= blackhole_enqueue,
36 	.dequeue	= blackhole_dequeue,
37 	.peek		= blackhole_dequeue,
38 	.owner		= THIS_MODULE,
39 };
40 
41 static int __init blackhole_init(void)
42 {
43 	return register_qdisc(&blackhole_qdisc_ops);
44 }
45 device_initcall(blackhole_init)
46