Perhaps the following would make it easier for applications to
track network device events without having to use netlink.
Compile tested only so far. The implementation is almost trivial...
--- a/net/core/Makefile 2008-11-21 12:25:31.000000000 -0800
+++ b/net/core/Makefile 2008-11-21 13:32:30.000000000 -0800
@@ -17,3 +17,4 @@ obj-$(CONFIG_NET_PKTGEN) += pktgen.o
obj-$(CONFIG_NETPOLL) += netpoll.o
obj-$(CONFIG_NET_DMA) += user_dma.o
obj-$(CONFIG_FIB_RULES) += fib_rules.o
+obj-$(CONFIG_HOTPLUG) += uevent.o
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ b/net/core/uevent.c 2008-11-21 13:42:13.000000000 -0800
@@ -0,0 +1,45 @@
+/*
+ * Linux network device event notification
+ *
+ * Author:
+ * Stephen Hemminger <shemminger@xxxxxxxxxx>
+ */
+
+#include <linux/kernel.h>
+#include <linux/netdevice.h>
+#include <linux/kobject.h>
+#include <linux/notifier.h>
+
+static int netdev_event(struct notifier_block *this, unsigned long event, void *ptr)
+{
+ struct net_device *netdev = ptr;
+
+ switch (event) {
+ case NETDEV_UNREGISTER:
+ kobject_uevent(&netdev->dev.kobj, KOBJ_REMOVE);
+ break;
+ case NETDEV_REGISTER:
+ kobject_uevent(&netdev->dev.kobj, KOBJ_ADD);
+ break;
+ case NETDEV_UP:
+ kobject_uevent(&netdev->dev.kobj, KOBJ_ONLINE);
+ break;
+ case NETDEV_DOWN:
+ kobject_uevent(&netdev->dev.kobj, KOBJ_OFFLINE);
+ break;
+ case NETDEV_CHANGE:
+ kobject_uevent(&netdev->dev.kobj, KOBJ_CHANGE);
+ break;
+ }
+ return NOTIFY_DONE;
+}
+
+static struct notifier_block netdev_uevent_notifier = {
+ .notifier_call = netdev_event,
+};
+
+static int __init netdev_uevent_init(void)
+{
+ return register_netdevice_notifier(&netdev_uevent_notifier);
+}
+device_initcall(netdev_uevent_init);
--
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