IPVS: Add sysctl_expire_nodest_conn()

In preparation for not including sysctl_expire_nodest_conn in
struct netns_ipvs when CONFIG_SYCTL is not defined.

Signed-off-by: Simon Horman <horms@verge.net.au>

net/netfilter/ipvs/ip_vs_core.c

@@ -613,10 +613,16 @@ static int sysctl_nat_icmp_send(struct net *net)
 	return ipvs->sysctl_nat_icmp_send;
 }
 
+static int sysctl_expire_nodest_conn(struct netns_ipvs *ipvs)
+{
+	return ipvs->sysctl_expire_nodest_conn;
+}
+
 #else
 
 static int sysctl_snat_reroute(struct sk_buff *skb) { return 0; }
 static int sysctl_nat_icmp_send(struct net *net) { return 0; }
+static int sysctl_expire_nodest_conn(struct netns_ipvs *ipvs) { return 0; }
 
 #endif
 
@@ -1583,7 +1589,7 @@ ip_vs_in(unsigned int hooknum, struct sk_buff *skb, int af)
 	if (cp->dest && !(cp->dest->flags & IP_VS_DEST_F_AVAILABLE)) {
 		/* the destination server is not available */
 
-		if (ipvs->sysctl_expire_nodest_conn) {
+		if (sysctl_expire_nodest_conn(ipvs)) {
 			/* try to expire the connection immediately */
 			ip_vs_conn_expire_now(cp);
 		}