1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * net/sched/sch_blackhole.c Black hole queue
4 *
5 * Authors: Thomas Graf <tgraf@suug.ch>
6 *
7 * Note: Quantum tunneling is not supported.
8 */
9
10 #include <linux/init.h>
11 #include <linux/types.h>
12 #include <linux/kernel.h>
13 #include <linux/skbuff.h>
14 #include <net/pkt_sched.h>
15
16 static int blackhole_enqueue(struct sk_buff *skb, struct Qdisc *sch,
17 struct sk_buff **to_free)
18 {
19 qdisc_drop(skb, sch, to_free);
20 return NET_XMIT_SUCCESS | __NET_XMIT_BYPASS;
21 }
22
23 static struct sk_buff *blackhole_dequeue(struct Qdisc *sch)
24 {
25 return NULL;
26 }
27
28 static struct Qdisc_ops blackhole_qdisc_ops __read_mostly = {
29 .id = "blackhole",
30 .priv_size = 0,
31 .enqueue = blackhole_enqueue,
32 .dequeue = blackhole_dequeue,
33 .peek = blackhole_dequeue,
34 .owner = THIS_MODULE,
35 };
36
37 static int __init blackhole_init(void)
38 {
39 return register_qdisc(&blackhole_qdisc_ops);
40 }
41 device_initcall(blackhole_init)
42
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