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

Move dst entries to a namespace loopback to catch refcounting leaks.
Signed-off-by: NDenis V. Lunev <den@openvz.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/core/dst.c

@@ -279,11 +279,11 @@ static inline void dst_ifdown(struct dst_entry *dst, struct net_device *dev,
 	if (!unregister) {
 		dst->input = dst->output = dst_discard;
 	} else {
-		dst->dev = init_net.loopback_dev;
+		dst->dev = dst->dev->nd_net->loopback_dev;
 		dev_hold(dst->dev);
 		dev_put(dev);
 		if (dst->neighbour && dst->neighbour->dev == dev) {
-			dst->neighbour->dev = init_net.loopback_dev;
+			dst->neighbour->dev = dst->dev;
 			dev_put(dev);
 			dev_hold(dst->neighbour->dev);
 		}

net/ipv4/route.c

@@ -1512,8 +1512,9 @@ static void ipv4_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
 {
 	struct rtable *rt = (struct rtable *) dst;
 	struct in_device *idev = rt->idev;
-	if (dev != init_net.loopback_dev && idev && idev->dev == dev) {
-		struct in_device *loopback_idev = in_dev_get(init_net.loopback_dev);
+	if (dev != dev->nd_net->loopback_dev && idev && idev->dev == dev) {
+		struct in_device *loopback_idev =
+			in_dev_get(dev->nd_net->loopback_dev);
 		if (loopback_idev) {
 			rt->idev = loopback_idev;
 			in_dev_put(idev);

net/ipv4/xfrm4_policy.c

@@ -214,7 +214,8 @@ static void xfrm4_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
 
 	xdst = (struct xfrm_dst *)dst;
 	if (xdst->u.rt.idev->dev == dev) {
-		struct in_device *loopback_idev = in_dev_get(init_net.loopback_dev);
+		struct in_device *loopback_idev =
+			in_dev_get(dev->nd_net->loopback_dev);
 		BUG_ON(!loopback_idev);
 
 		do {

net/ipv6/route.c

@@ -216,9 +216,12 @@ static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
 {
 	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);

net/ipv6/xfrm6_policy.c

@@ -229,7 +229,8 @@ static void xfrm6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
 
 	xdst = (struct xfrm_dst *)dst;
 	if (xdst->u.rt6.rt6i_idev->dev == dev) {
-		struct inet6_dev *loopback_idev = in6_dev_get(init_net.loopback_dev);
+		struct inet6_dev *loopback_idev =
+			in6_dev_get(dev->nd_net->loopback_dev);
 		BUG_ON(!loopback_idev);
 
 		do {

net/xfrm/xfrm_policy.c

@@ -1934,7 +1934,7 @@ static int stale_bundle(struct dst_entry *dst)
 void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev)
 {
 	while ((dst = dst->child) && dst->xfrm && dst->dev == dev) {
-		dst->dev = init_net.loopback_dev;
+		dst->dev = dev->nd_net->loopback_dev;
 		dev_hold(dst->dev);
 		dev_put(dev);
 	}