18c2ecf20Sopenharmony_ci// SPDX-License-Identifier: GPL-2.0-or-later 28c2ecf20Sopenharmony_ci/* 38c2ecf20Sopenharmony_ci * net/sched/sch_blackhole.c Black hole queue 48c2ecf20Sopenharmony_ci * 58c2ecf20Sopenharmony_ci * Authors: Thomas Graf <tgraf@suug.ch> 68c2ecf20Sopenharmony_ci * 78c2ecf20Sopenharmony_ci * Note: Quantum tunneling is not supported. 88c2ecf20Sopenharmony_ci */ 98c2ecf20Sopenharmony_ci 108c2ecf20Sopenharmony_ci#include <linux/init.h> 118c2ecf20Sopenharmony_ci#include <linux/types.h> 128c2ecf20Sopenharmony_ci#include <linux/kernel.h> 138c2ecf20Sopenharmony_ci#include <linux/skbuff.h> 148c2ecf20Sopenharmony_ci#include <net/pkt_sched.h> 158c2ecf20Sopenharmony_ci 168c2ecf20Sopenharmony_cistatic int blackhole_enqueue(struct sk_buff *skb, struct Qdisc *sch, 178c2ecf20Sopenharmony_ci struct sk_buff **to_free) 188c2ecf20Sopenharmony_ci{ 198c2ecf20Sopenharmony_ci qdisc_drop(skb, sch, to_free); 208c2ecf20Sopenharmony_ci return NET_XMIT_SUCCESS | __NET_XMIT_BYPASS; 218c2ecf20Sopenharmony_ci} 228c2ecf20Sopenharmony_ci 238c2ecf20Sopenharmony_cistatic struct sk_buff *blackhole_dequeue(struct Qdisc *sch) 248c2ecf20Sopenharmony_ci{ 258c2ecf20Sopenharmony_ci return NULL; 268c2ecf20Sopenharmony_ci} 278c2ecf20Sopenharmony_ci 288c2ecf20Sopenharmony_cistatic struct Qdisc_ops blackhole_qdisc_ops __read_mostly = { 298c2ecf20Sopenharmony_ci .id = "blackhole", 308c2ecf20Sopenharmony_ci .priv_size = 0, 318c2ecf20Sopenharmony_ci .enqueue = blackhole_enqueue, 328c2ecf20Sopenharmony_ci .dequeue = blackhole_dequeue, 338c2ecf20Sopenharmony_ci .peek = blackhole_dequeue, 348c2ecf20Sopenharmony_ci .owner = THIS_MODULE, 358c2ecf20Sopenharmony_ci}; 368c2ecf20Sopenharmony_ci 378c2ecf20Sopenharmony_cistatic int __init blackhole_init(void) 388c2ecf20Sopenharmony_ci{ 398c2ecf20Sopenharmony_ci return register_qdisc(&blackhole_qdisc_ops); 408c2ecf20Sopenharmony_ci} 418c2ecf20Sopenharmony_cidevice_initcall(blackhole_init) 42