IPVS: Add sysctl_sync_ver()

In preparation for not including sysctl_sync_ver in
struct netns_ipvs when CONFIG_SYCTL is not defined.
Signed-off-by: Simon Horman <horms@verge.net.au>

include/net/ip_vs.h

@@ -911,6 +911,7 @@ struct netns_ipvs {
 
 #define DEFAULT_SYNC_THRESHOLD	3
 #define DEFAULT_SYNC_PERIOD	50
+#define DEFAULT_SYNC_VER	1
 
 #ifdef CONFIG_SYSCTL
 
@@ -924,6 +925,11 @@ static inline int sysctl_sync_period(struct netns_ipvs *ipvs)
 	return ipvs->sysctl_sync_threshold[1];
 }
 
+static inline int sysctl_sync_ver(struct netns_ipvs *ipvs)
+{
+	return ipvs->sysctl_sync_ver;
+}
+
 #else
 
 static inline int sysctl_sync_threshold(struct netns_ipvs *ipvs)
@@ -936,6 +942,11 @@ static inline int sysctl_sync_period(struct netns_ipvs *ipvs)
 	return DEFAULT_SYNC_PERIOD;
 }
 
+static inline int sysctl_sync_ver(struct netns_ipvs *ipvs)
+{
+	return DEFAULT_SYNC_VER;
+}
+
 #endif
 
 /*

net/netfilter/ipvs/ip_vs_sync.c

@@ -394,7 +394,7 @@ void ip_vs_sync_switch_mode(struct net *net, int mode)
 
 	if (!(ipvs->sync_state & IP_VS_STATE_MASTER))
 		return;
-	if (mode == ipvs->sysctl_sync_ver || !ipvs->sync_buff)
+	if (mode == sysctl_sync_ver(ipvs) || !ipvs->sync_buff)
 		return;
 
 	spin_lock_bh(&ipvs->sync_buff_lock);
@@ -521,7 +521,7 @@ void ip_vs_sync_conn(struct net *net, struct ip_vs_conn *cp)
 	unsigned int len, pe_name_len, pad;
 
 	/* Handle old version of the protocol */
-	if (ipvs->sysctl_sync_ver == 0) {
+	if (sysctl_sync_ver(ipvs) == 0) {
 		ip_vs_sync_conn_v0(net, cp);
 		return;
 	}