net: add netnotifier event for upper device change
Now when upper device is changed, event is not propagated via RT Netlink
to userspace. Userspace might never now about the change. Fix this by
adding upper-device-change notifier event.
Signed-off-by: Jiri Pirko <jiri@resnulli.us>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 0ebd63a..ea7b6bc 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -1593,6 +1593,7 @@
#define NETDEV_RELEASE 0x0012
#define NETDEV_NOTIFY_PEERS 0x0013
#define NETDEV_JOIN 0x0014
+#define NETDEV_CHANGEUPPER 0x0015
extern int register_netdevice_notifier(struct notifier_block *nb);
extern int unregister_netdevice_notifier(struct notifier_block *nb);
diff --git a/net/core/dev.c b/net/core/dev.c
index 7229bc3..50c02de 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -4411,7 +4411,7 @@
else
list_add_tail_rcu(&upper->list, &dev->upper_dev_list);
dev_hold(upper_dev);
-
+ call_netdevice_notifiers(NETDEV_CHANGEUPPER, dev);
return 0;
}
@@ -4471,6 +4471,7 @@
list_del_rcu(&upper->list);
dev_put(upper_dev);
kfree_rcu(upper, rcu);
+ call_netdevice_notifiers(NETDEV_CHANGEUPPER, dev);
}
EXPORT_SYMBOL(netdev_upper_dev_unlink);
