def METHOD_NAME(self):
    """
    Return tcp-ipv6 attribute dict
    :return: None if no tcp-ipv6 in xml, dict of tcp-ipv6's attributes.
    """
    try:
        tcp_node = self.xmltreefile.reroot('/tcp-ipv6')
    except KeyError as detail:
        raise xcepts.LibvirtXMLError(detail)
    node = tcp_node.getroot()
    tcp_attr = dict(list(node.items()))
    return tcp_attr