IFF_ISATAP
if (dev->priv_flags & IFF_ISATAP)
if (dev->priv_flags & IFF_ISATAP) {
if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
dev->priv_flags |= IFF_ISATAP;
if (tunnel->dev->priv_flags & IFF_ISATAP) {
if ((dev->priv_flags & IFF_ISATAP) &&