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(qops: &blackhole_qdisc_ops); |
40 | } |
41 | device_initcall(blackhole_init) |
42 | |