IP_DROP_MEMBERSHIP
|| option == IP_DROP_MEMBERSHIP
if (option == IP_ADD_MEMBERSHIP || option == IP_DROP_MEMBERSHIP) {
case IP_DROP_MEMBERSHIP:
case IP_DROP_MEMBERSHIP:
if (option == IP_DROP_MEMBERSHIP
return IP_DROP_MEMBERSHIP;
SOCKET_OPTION_INFO_ENTRY(IPPROTO_IP, IP_DROP_MEMBERSHIP),