IPVS: Add internal versions of sockopt interface structs

Add extended internal versions of struct ip_vs_service_user and struct
ip_vs_dest_user (the originals can't be modified as they are part
of the old sockopt interface). Adjust ip_vs_ctl.c to work with the new
data structures and add some minor AF-awareness.
Signed-off-by: Julius Volz <juliusv@google.com>
Signed-off-by: Simon Horman <horms@verge.net.au>

include/net/ip_vs.h

@@ -399,6 +399,45 @@ struct ip_vs_conn {
 };
 
 
+/*
+ *	Extended internal versions of struct ip_vs_service_user and
+ *	ip_vs_dest_user for IPv6 support.
+ *
+ *	We need these to conveniently pass around service and destination
+ *	options, but unfortunately, we also need to keep the old definitions to
+ *	maintain userspace backwards compatibility for the setsockopt interface.
+ */
+struct ip_vs_service_user_kern {
+	/* virtual service addresses */
+	u16			af;
+	u16			protocol;
+	union nf_inet_addr	addr;		/* virtual ip address */
+	u16			port;
+	u32			fwmark;		/* firwall mark of service */
+
+	/* virtual service options */
+	char			*sched_name;
+	unsigned		flags;		/* virtual service flags */
+	unsigned		timeout;	/* persistent timeout in sec */
+	u32			netmask;	/* persistent netmask */
+};
+
+
+struct ip_vs_dest_user_kern {
+	/* destination server address */
+	union nf_inet_addr	addr;
+	u16			port;
+
+	/* real server options */
+	unsigned		conn_flags;	/* connection flags */
+	int			weight;		/* destination weight */
+
+	/* thresholds for active connections */
+	u32			u_threshold;	/* upper threshold */
+	u32			l_threshold;	/* lower threshold */
+};
+
+
 /*
  *	The information about the virtual service offered to the net
  *	and the forwarding entries