IPVS: Add IPv6 support flag to schedulers

Add 'supports_ipv6' flag to struct ip_vs_scheduler to indicate whether a
scheduler supports IPv6. Set the flag to 1 in schedulers that work with
IPv6, 0 otherwise. This flag is checked in a later patch while trying to
add a service with a specific scheduler. Adjust debug in v6-supporting
schedulers to work with both address families.

Signed-off-by: Julius Volz <juliusv@google.com>
Signed-off-by: Simon Horman <horms@verge.net.au>

include/net/ip_vs.h

@@ -516,6 +516,9 @@ struct ip_vs_scheduler {
 	char			*name;		/* scheduler name */
 	atomic_t		refcnt;		/* reference counter */
 	struct module		*module;	/* THIS_MODULE/NULL */
+#ifdef CONFIG_IP_VS_IPV6
+	int			supports_ipv6;	/* scheduler has IPv6 support */
+#endif
 
 	/* scheduler initializing service */
 	int (*init_service)(struct ip_vs_service *svc);