ipv4: Namespaceify tcp_retries1 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 eb4cd0a..dee6ba6 100644
--- a/include/net/netns/ipv4.h
+++ b/include/net/netns/ipv4.h
@@ -102,6 +102,7 @@
 	int sysctl_tcp_synack_retries;
 	int sysctl_tcp_syncookies;
 	int sysctl_tcp_reordering;
+	int sysctl_tcp_retries1;
 
 	struct ping_group_range ping_group_range;