[IPIP]: Allow for IPPROTO_IPIP protocol in namespaces.

This one was disabled by default for sanity.

Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv4/tunnel4.c b/net/ipv4/tunnel4.c
index 978b3fd..cc4cd0e 100644
--- a/net/ipv4/tunnel4.c
+++ b/net/ipv4/tunnel4.c
@@ -136,6 +136,7 @@
 	.handler	=	tunnel4_rcv,
 	.err_handler	=	tunnel4_err,
 	.no_policy	=	1,
+	.netns_ok	=	1,
 };
 
 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)