sch_blackhole.c

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/*
 * net/sched/sch_blackhole.c    Black hole queue
 *
 *      This program is free software; you can redistribute it and/or
 *      modify it under the terms of the GNU General Public License
 *      as published by the Free Software Foundation; either version
 *      2 of the License, or (at your option) any later version.
 *
 * Authors: Thomas Graf <[email protected]>
 *
 * Note: Quantum tunneling is not supported.
 */

#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/skbuff.h>
#include <net/pkt_sched.h>

static int blackhole_enqueue(struct sk_buff *skb, struct Qdisc *sch)
{
    qdisc_drop(skb, sch);
    return NET_XMIT_SUCCESS;
}

static struct sk_buff *blackhole_dequeue(struct Qdisc *sch)
{
    return NULL;
}

static struct Qdisc_ops blackhole_qdisc_ops __read_mostly = {
    .id     = "blackhole",
    .priv_size  = 0,
    .enqueue    = blackhole_enqueue,
    .dequeue    = blackhole_dequeue,
    .peek       = blackhole_dequeue,
    .owner      = THIS_MODULE,
};

static int __init blackhole_module_init(void)
{
    return register_qdisc(&blackhole_qdisc_ops);
}

static void __exit blackhole_module_exit(void)
{
    unregister_qdisc(&blackhole_qdisc_ops);
}

module_init(blackhole_module_init)
module_exit(blackhole_module_exit)

MODULE_LICENSE("GPL");