[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>

diff --git a/net/sched/Makefile b/net/sched/Makefile
index 8f58cecd6266eedae186f08f6eb86c31bfc7a391..e48d0d456b3ebfe0727eca1f116b9f2d1160ec33 100644 (file)
--- a/net/sched/Makefile
+++ b/net/sched/Makefile
@@ -4,7 +4,7 @@
 
 obj-y  := sch_generic.o
 
-obj-$(CONFIG_NET_SCHED)                += sch_api.o sch_fifo.o
+obj-$(CONFIG_NET_SCHED)                += sch_api.o sch_fifo.o sch_blackhole.o
 obj-$(CONFIG_NET_CLS)          += cls_api.o
 obj-$(CONFIG_NET_CLS_ACT)      += act_api.o
 obj-$(CONFIG_NET_ACT_POLICE)   += police.o

diff --git a/net/sched/sch_blackhole.c b/net/sched/sch_blackhole.c
new file mode 100644 (file)
index 0000000..81f0b83
--- /dev/null
+++ b/net/sched/sch_blackhole.c
@@ -0,0 +1,54 @@
+/*
+ * 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 <tgraf@suug.ch>
+ *
+ * Note: Quantum tunneling is not supported.
+ */
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/netdevice.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 = {
+       .id             = "blackhole",
+       .priv_size      = 0,
+       .enqueue        = blackhole_enqueue,
+       .dequeue        = 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");