[NETNS]: Process IP layer in the context of the correct namespace.

Replace all the rest of the init_net with a proper net on the IP layer.

Signed-off-by: Denis V. Lunev <den@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv4/ip_fragment.c b/net/ipv4/ip_fragment.c
index 3b2e5ad..8b448c4 100644
--- a/net/ipv4/ip_fragment.c
+++ b/net/ipv4/ip_fragment.c
@@ -204,8 +204,11 @@
 
 	if ((qp->q.last_in&FIRST_IN) && qp->q.fragments != NULL) {
 		struct sk_buff *head = qp->q.fragments;
+		struct net *net;
+
+		net = container_of(qp->q.net, struct net, ipv4.frags);
 		/* Send an ICMP "Fragment Reassembly Timeout" message. */
-		if ((head->dev = dev_get_by_index(&init_net, qp->iif)) != NULL) {
+		if ((head->dev = dev_get_by_index(net, qp->iif)) != NULL) {
 			icmp_send(head, ICMP_TIME_EXCEEDED, ICMP_EXC_FRAGTIME, 0);
 			dev_put(head->dev);
 		}