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 0ebd63ae2cc825e487b55a8fb7ae23e0dab1b864..ea7b6bce9ea07f345b302a2fe466963c88762e50 100644 (file)
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -1593,6 +1593,7 @@ struct packet_offload {
 #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 7229bc30e509d309d1dd5f1be055c95212eaeb69..50c02ded1d69dad8d4ce4f9bd64b4eccef0d416f 100644 (file)
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -4411,7 +4411,7 @@ static int __netdev_upper_dev_link(struct net_device *dev,
        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 @@ void netdev_upper_dev_unlink(struct net_device *dev,
        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);