1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-or-later
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * net/sched/sch_blackhole.c Black hole queue
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * Authors: Thomas Graf <tgraf@suug.ch>
6*4882a593Smuzhiyun *
7*4882a593Smuzhiyun * Note: Quantum tunneling is not supported.
8*4882a593Smuzhiyun */
9*4882a593Smuzhiyun
10*4882a593Smuzhiyun #include <linux/init.h>
11*4882a593Smuzhiyun #include <linux/types.h>
12*4882a593Smuzhiyun #include <linux/kernel.h>
13*4882a593Smuzhiyun #include <linux/skbuff.h>
14*4882a593Smuzhiyun #include <net/pkt_sched.h>
15*4882a593Smuzhiyun
blackhole_enqueue(struct sk_buff * skb,struct Qdisc * sch,struct sk_buff ** to_free)16*4882a593Smuzhiyun static int blackhole_enqueue(struct sk_buff *skb, struct Qdisc *sch,
17*4882a593Smuzhiyun struct sk_buff **to_free)
18*4882a593Smuzhiyun {
19*4882a593Smuzhiyun qdisc_drop(skb, sch, to_free);
20*4882a593Smuzhiyun return NET_XMIT_SUCCESS | __NET_XMIT_BYPASS;
21*4882a593Smuzhiyun }
22*4882a593Smuzhiyun
blackhole_dequeue(struct Qdisc * sch)23*4882a593Smuzhiyun static struct sk_buff *blackhole_dequeue(struct Qdisc *sch)
24*4882a593Smuzhiyun {
25*4882a593Smuzhiyun return NULL;
26*4882a593Smuzhiyun }
27*4882a593Smuzhiyun
28*4882a593Smuzhiyun static struct Qdisc_ops blackhole_qdisc_ops __read_mostly = {
29*4882a593Smuzhiyun .id = "blackhole",
30*4882a593Smuzhiyun .priv_size = 0,
31*4882a593Smuzhiyun .enqueue = blackhole_enqueue,
32*4882a593Smuzhiyun .dequeue = blackhole_dequeue,
33*4882a593Smuzhiyun .peek = blackhole_dequeue,
34*4882a593Smuzhiyun .owner = THIS_MODULE,
35*4882a593Smuzhiyun };
36*4882a593Smuzhiyun
blackhole_init(void)37*4882a593Smuzhiyun static int __init blackhole_init(void)
38*4882a593Smuzhiyun {
39*4882a593Smuzhiyun return register_qdisc(&blackhole_qdisc_ops);
40*4882a593Smuzhiyun }
41*4882a593Smuzhiyun device_initcall(blackhole_init)
42