IPADM_OPT_RELEASE
uint32_t rflags = (atype == IPADM_ADDR_DHCP ? IPADM_OPT_RELEASE : 0);
flags |= IPADM_OPT_RELEASE;
boolean_t release = ((flags & IPADM_OPT_RELEASE) != 0);
(flags & ~(IPADM_COMMON_OPT_MASK|IPADM_OPT_RELEASE))) {