12874c5fdSThomas Gleixner // SPDX-License-Identifier: GPL-2.0-or-later 263d886c9SThomas Graf /* 363d886c9SThomas Graf * net/sched/sch_blackhole.c Black hole queue 463d886c9SThomas Graf * 563d886c9SThomas Graf * Authors: Thomas Graf <tgraf@suug.ch> 663d886c9SThomas Graf * 763d886c9SThomas Graf * Note: Quantum tunneling is not supported. 863d886c9SThomas Graf */ 963d886c9SThomas Graf 10075640e3SPaul Gortmaker #include <linux/init.h> 1163d886c9SThomas Graf #include <linux/types.h> 1263d886c9SThomas Graf #include <linux/kernel.h> 1363d886c9SThomas Graf #include <linux/skbuff.h> 1463d886c9SThomas Graf #include <net/pkt_sched.h> 1563d886c9SThomas Graf 16*ac5c66f2SPetr Machata static int blackhole_enqueue(struct sk_buff *skb, struct Qdisc *sch, 17520ac30fSEric Dumazet struct sk_buff **to_free) 1863d886c9SThomas Graf { 19520ac30fSEric Dumazet qdisc_drop(skb, sch, to_free); 207e85dc8cSKonstantin Khlebnikov return NET_XMIT_SUCCESS | __NET_XMIT_BYPASS; 2163d886c9SThomas Graf } 2263d886c9SThomas Graf 2363d886c9SThomas Graf static struct sk_buff *blackhole_dequeue(struct Qdisc *sch) 2463d886c9SThomas Graf { 2563d886c9SThomas Graf return NULL; 2663d886c9SThomas Graf } 2763d886c9SThomas Graf 2820fea08bSEric Dumazet static struct Qdisc_ops blackhole_qdisc_ops __read_mostly = { 2963d886c9SThomas Graf .id = "blackhole", 3063d886c9SThomas Graf .priv_size = 0, 3163d886c9SThomas Graf .enqueue = blackhole_enqueue, 3263d886c9SThomas Graf .dequeue = blackhole_dequeue, 338e3af978SJarek Poplawski .peek = blackhole_dequeue, 3463d886c9SThomas Graf .owner = THIS_MODULE, 3563d886c9SThomas Graf }; 3663d886c9SThomas Graf 37075640e3SPaul Gortmaker static int __init blackhole_init(void) 3863d886c9SThomas Graf { 3963d886c9SThomas Graf return register_qdisc(&blackhole_qdisc_ops); 4063d886c9SThomas Graf } 41075640e3SPaul Gortmaker device_initcall(blackhole_init) 42