SIOCSETVLAN
if (ifconfig_ioctlwrap(h, AF_LOCAL, SIOCSETVLAN, &ifr) == -1) {
if (ioctl(s, SIOCSETVLAN, (caddr_t)ifr) == -1)
if (ioctl_ctx(ctx, SIOCSETVLAN, (caddr_t)&ifr) == -1)
if (ifconfig_err_ioctlreq(lifh) == SIOCSETVLAN) {
case SIOCSETVLAN: