UNMAP_IPIF_ID
ipifid = UNMAP_IPIF_ID(ifdata);
UNMAP_IPIF_ID((uint_t)ifdata), (family == AF_INET6), ipst);
UNMAP_IPIF_ID((uint_t)ifdata), (family == AF_INET6), ipst);
ipifid = UNMAP_IPIF_ID(ifdata);
oldidx = UNMAP_IPIF_ID(ifdata);