rds_do_ip_ioctl
if ((err = rds_do_ip_ioctl(SIOCGIFNUM, sizeof (int), &nifs)) != 0)
err = rds_do_ip_ioctl(SIOCGLIFCONF, sizeof (struct lifconf), lifcp);
err = rds_do_ip_ioctl(iocp->ioc_cmd, sizeof (struct ifreq),