[NET]: Multiple namespaces in the all dst_ifdown routines.

Move dst entries to a namespace loopback to catch refcounting leaks.

Signed-off-by: Denis V. Lunev <den@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index e2c980d..452111f 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -216,9 +216,12 @@
 {
 	struct rt6_info *rt = (struct rt6_info *)dst;
 	struct inet6_dev *idev = rt->rt6i_idev;
+	struct net_device *loopback_dev =
+		dev->nd_net->loopback_dev;
 
-	if (dev != init_net.loopback_dev && idev != NULL && idev->dev == dev) {
-		struct inet6_dev *loopback_idev = in6_dev_get(init_net.loopback_dev);
+	if (dev != loopback_dev && idev != NULL && idev->dev == dev) {
+		struct inet6_dev *loopback_idev =
+			in6_dev_get(loopback_dev);
 		if (loopback_idev != NULL) {
 			rt->rt6i_idev = loopback_idev;
 			in6_dev_put(idev);