SIOCSLIFPREFIX
{ (uint_t)SIOCSLIFPREFIX, "SIOCSLIFPREFIX", "lifreq" }, /* 191 */
err = ioctl(iph->iph_sock6, SIOCSLIFPREFIX, (caddr_t)&lifr);
/* 191 */ { SIOCSLIFPREFIX, sizeof (struct lifreq), IPI_PRIV | IPI_WR,