ipv4: Namespaceify tcp_orphan_retries sysctl knob

Signed-off-by: Nikolay Borisov <kernel@kyup.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/net/netns/ipv4.h b/include/net/netns/ipv4.h
index d92c8e5..0802303 100644
--- a/include/net/netns/ipv4.h
+++ b/include/net/netns/ipv4.h
@@ -104,6 +104,7 @@
 	int sysctl_tcp_reordering;
 	int sysctl_tcp_retries1;
 	int sysctl_tcp_retries2;
+	int sysctl_tcp_orphan_retries;
 
 	struct ping_group_range ping_group_range;