write only the data we receive

Change-Id: I290d289dacece0b00b18b3d90f2d1807f0ada636

Author: aojea

pkg/loadbalancer/tunnel.go

@@ -211,7 +211,7 @@ func (t *tunnel) handleUDPConnection(conn *net.UDPConn) error {
 	}
 	defer remoteConn.Close()
 
-	nWrite, err := remoteConn.Write(buf)
+	nWrite, err := remoteConn.Write(buf[:nRead])
 	if err != nil {
 		return fmt.Errorf("fail to write to remote %s: %s", remoteConn.RemoteAddr(), err)
 	} else if nWrite < nRead {
@@ -230,7 +230,7 @@ func (t *tunnel) handleUDPConnection(conn *net.UDPConn) error {
 	}
 	klog.V(4).Infof("Read %d bytes from %s", nRead, remoteConn.RemoteAddr().String())
 
-	_, err = conn.WriteToUDP(buf, srcAddr)
+	_, err = conn.WriteToUDP(buf[:nRead], srcAddr)
 
 	return err
 }