--- a/ipv4/ipcomp.c	2011-11-11 13:12:24.000000000 -0500
+++ b/net/ipv4/ipcomp.c	2011-11-08 09:12:37.000000000 -0500
@@ -151,6 +151,7 @@ static const struct net_protocol ipcomp4
 	.handler	=	xfrm4_rcv,
 	.err_handler	=	ipcomp4_err,
 	.no_policy	=	1,
+	.netns_ok		= 1,
 };

 static int __init ipcomp4_init(void)