BWI_F_PROMISC
if (ic->ic_promisc > 0 && (sc->sc_flags & BWI_F_PROMISC) == 0) {
sc->sc_flags |= BWI_F_PROMISC;
(sc->sc_flags & BWI_F_PROMISC) != 0) {
sc->sc_flags &= ~BWI_F_PROMISC;