INETADDRESSTYPE_IPV4
if (af < INETADDRESSTYPE_IPV4 ||
(af == INETADDRESSTYPE_IPV4 && alen < 4)) {
} else if (af > INETADDRESSTYPE_IPV4 ||
(af == INETADDRESSTYPE_IPV4 && alen > 4)) {
INETADDRESSTYPE_IPV4);
INETADDRESSTYPE_IPV4);