diff --git a/include/net/net_namespace.h b/include/net/net_namespace.h
index f8f3d1a..c01d45f 100644
--- a/include/net/net_namespace.h
+++ b/include/net/net_namespace.h
@@ -8,6 +8,7 @@
 #include <linux/workqueue.h>
 #include <linux/list.h>
 
+#include <net/netns/core.h>
 #include <net/netns/unix.h>
 #include <net/netns/packet.h>
 #include <net/netns/ipv4.h>
@@ -46,10 +47,7 @@
 
 	struct sock 		*rtnl;			/* rtnetlink socket */
 
-	/* core sysctls */
-	struct ctl_table_header	*sysctl_core_hdr;
-	int			sysctl_somaxconn;
-
+	struct netns_core	core;
 	struct netns_packet	packet;
 	struct netns_unix	unx;
 	struct netns_ipv4	ipv4;
diff --git a/include/net/netns/core.h b/include/net/netns/core.h
new file mode 100644
index 0000000..0e8c0f8
--- /dev/null
+++ b/include/net/netns/core.h
@@ -0,0 +1,13 @@
+#ifndef __NETNS_CORE_H__
+#define __NETNS_CORE_H__
+
+struct ctl_table_header;
+
+struct netns_core {
+	/* core sysctls */
+	struct ctl_table_header	*sysctl_hdr;
+
+	int	sysctl_somaxconn;
+};
+
+#endif
diff --git a/net/core/sysctl_net_core.c b/net/core/sysctl_net_core.c
index 130338f..5fc8010 100644
--- a/net/core/sysctl_net_core.c
+++ b/net/core/sysctl_net_core.c
@@ -127,7 +127,7 @@
 	{
 		.ctl_name	= NET_CORE_SOMAXCONN,
 		.procname	= "somaxconn",
-		.data		= &init_net.sysctl_somaxconn,
+		.data		= &init_net.core.sysctl_somaxconn,
 		.maxlen		= sizeof(int),
 		.mode		= 0644,
 		.proc_handler	= &proc_dointvec
@@ -161,7 +161,7 @@
 {
 	struct ctl_table *tbl, *tmp;
 
-	net->sysctl_somaxconn = SOMAXCONN;
+	net->core.sysctl_somaxconn = SOMAXCONN;
 
 	tbl = net_core_table;
 	if (net != &init_net) {
@@ -178,9 +178,9 @@
 		}
 	}
 
-	net->sysctl_core_hdr = register_net_sysctl_table(net,
+	net->core.sysctl_hdr = register_net_sysctl_table(net,
 			net_core_path, tbl);
-	if (net->sysctl_core_hdr == NULL)
+	if (net->core.sysctl_hdr == NULL)
 		goto err_reg;
 
 	return 0;
@@ -196,8 +196,8 @@
 {
 	struct ctl_table *tbl;
 
-	tbl = net->sysctl_core_hdr->ctl_table_arg;
-	unregister_net_sysctl_table(net->sysctl_core_hdr);
+	tbl = net->core.sysctl_hdr->ctl_table_arg;
+	unregister_net_sysctl_table(net->core.sysctl_hdr);
 	BUG_ON(tbl == net_core_table);
 	kfree(tbl);
 }
diff --git a/net/socket.c b/net/socket.c
index 79e5382..9b5c917 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -1375,7 +1375,7 @@
 
 	sock = sockfd_lookup_light(fd, &err, &fput_needed);
 	if (sock) {
-		somaxconn = sock_net(sock->sk)->sysctl_somaxconn;
+		somaxconn = sock_net(sock->sk)->core.sysctl_somaxconn;
 		if ((unsigned)backlog > somaxconn)
 			backlog = somaxconn;