IFM_MMASK
ifr.ifr_media = (ifmr->ifm_current & ~IFM_MMASK) | mode;
ifmr->ifm_current = (ifmr->ifm_current & ~IFM_MMASK) | mode;
#define IFM_MODE(x) ((x) & IFM_MMASK)
(((mode) << IFM_MSHIFT) & IFM_MMASK)
imr.ifm_active &~ (IFM_MMASK | IFM_IEEE80211_TURBO));