rtnetlink: Add missing manual netlink notification in dev_change_net_namespaces

BugLink: http://bugs.launchpad.net/bugs/890952

commit d2237d35748e7f448a9c2d9dc6a85ef637466e24 upstream.

Renato Westphal noticed that since commit a2835763e130c343ace5320c20d33c281e7097b7
"rtnetlink: handle rtnl_link netlink notifications manually" was merged
we no longer send a netlink message when a networking device is moved
from one network namespace to another.

Fix this by adding the missing manual notification in dev_change_net_namespaces.

Since all network devices that are processed by dev_change_net_namspaces are
in the initialized state the complicated tests that guard the manual
rtmsg_ifinfo calls in rollback_registered and register_netdevice are
unnecessary and we can just perform a plain notification.

Tested-by: Renato Westphal <renatowestphal@gmail.com>
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Tim Gardner <tim.gardner@canonical.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/net/core/dev.c b/net/core/dev.c
index 9c58c1ec41a..f14f6015a7a 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -6105,6 +6105,7 @@ int dev_change_net_namespace(struct net_device *dev, struct net *net, const char
         */
         call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
         call_netdevice_notifiers(NETDEV_UNREGISTER_BATCH, dev);
+        rtmsg_ifinfo(RTM_DELLINK, dev, ~0U);
 
         /*
          *      Flush the unicast and multicast chains