完善主程序

upper/data.go

@@ -2,7 +2,15 @@ package upper
 
 import "io"
 
+// 常用服务端口
+const (
+	// ServiceNull 不在意端口号的服务
+	ServiceNull = iota
+	// ServiceTunnel 管道通信服务
+	ServiceTunnel
+)
+
 type Service interface {
-	Create(peer string, srcport uint16, destport uint16) (Service, error)
+	Create(peer string, srcport, destport, mtu uint16) (Service, error)
 	io.ReadWriteCloser
 }