SIOCSIFPHYADDR_IN6
if (ioctl(s, SIOCSIFPHYADDR_IN6, &addreq) < 0)
case SIOCSIFPHYADDR_IN6:
case SIOCSIFPHYADDR_IN6:
case SIOCSIFPHYADDR_IN6:
case SIOCSIFPHYADDR_IN6:
SIOCSIFPHYADDR_IN6, C(in6_addreq), C(in6_ifr) },