add sockopts config

common/net/dialer/dialer_linux.go

@@ -12,3 +12,10 @@ func bindDevice(fd uintptr, ifceName string) error {
 	}
 	return unix.BindToDevice(int(fd), ifceName)
 }
+
+func setMark(fd uintptr, mark int) error {
+	if mark == 0 {
+		return nil
+	}
+	return unix.SetsockoptInt(int(fd), unix.SOL_SOCKET, unix.SO_MARK, mark)
+}