ifstate_is_up
depend_ok = ifstate_is_up(iface);
int ifstate_is_up(struct iface *iface);
ifstate_is_up(ifp);
if (ifstate_is_up(i))
iface->depend_ok = ifstate_is_up(depend_if);
ifstate_is_up(ifp);
if (ifstate_is_up(i))
depend_ok = ifstate_is_up(kif);
int ifstate_is_up(struct kif *kif);
ifstate_is_up(kif);
iface->depend_ok = ifstate_is_up(kif);