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authorThomas Graf <tgraf@suug.ch>2005-07-05 18:29:16 -0400
committerDavid S. Miller <davem@davemloft.net>2005-07-05 18:29:16 -0400
commit63d886c96b2a580b1bf764de238ba3c63515b5ee (patch)
treedf855d79c4d956f5db562c0793ce307dd22f62b4 /net/sched/sch_blackhole.c
parentc1b4a7e69576d65efc31a8cea0714173c2841244 (diff)
[PKT_SCHED]: Blackhole queueing discipline
Useful in combination with classful qdiscs to drop or temporary disable certain flows, e.g. one could block specific ds flows with dsmark. Unlike the noop qdisc it can be controlled by the user and statistic accounting is done. Signed-off-by: Thomas Graf <tgraf@suug.ch> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/sched/sch_blackhole.c')
-rw-r--r--net/sched/sch_blackhole.c54
1 files changed, 54 insertions, 0 deletions
diff --git a/net/sched/sch_blackhole.c b/net/sched/sch_blackhole.c
new file mode 100644
index 000000000000..81f0b8346d17
--- /dev/null
+++ b/net/sched/sch_blackhole.c
@@ -0,0 +1,54 @@
1/*
2 * net/sched/sch_blackhole.c Black hole queue
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
8 *
9 * Authors: Thomas Graf <tgraf@suug.ch>
10 *
11 * Note: Quantum tunneling is not supported.
12 */
13
14#include <linux/config.h>
15#include <linux/module.h>
16#include <linux/types.h>
17#include <linux/kernel.h>
18#include <linux/netdevice.h>
19#include <linux/skbuff.h>
20#include <net/pkt_sched.h>
21
22static int blackhole_enqueue(struct sk_buff *skb, struct Qdisc *sch)
23{
24 qdisc_drop(skb, sch);
25 return NET_XMIT_SUCCESS;
26}
27
28static struct sk_buff *blackhole_dequeue(struct Qdisc *sch)
29{
30 return NULL;
31}
32
33static struct Qdisc_ops blackhole_qdisc_ops = {
34 .id = "blackhole",
35 .priv_size = 0,
36 .enqueue = blackhole_enqueue,
37 .dequeue = blackhole_dequeue,
38 .owner = THIS_MODULE,
39};
40
41static int __init blackhole_module_init(void)
42{
43 return register_qdisc(&blackhole_qdisc_ops);
44}
45
46static void __exit blackhole_module_exit(void)
47{
48 unregister_qdisc(&blackhole_qdisc_ops);
49}
50
51module_init(blackhole_module_init)
52module_exit(blackhole_module_exit)
53
54MODULE_LICENSE("GPL");