_IFM_ETH_XTMASK
ifr->ifr_media &= ~_IFM_ETH_XTMASK;
*oldwd = (*newwd & ~(_IFM_ETH_XTMASK | IFM_TMASK)) | IFM_OTHER;
(((x) & (_IFM_ETH_XTMASK >> IFM_ETH_XSHIFT)) << IFM_ETH_XSHIFT))
#define IFM_ETHER_SUBTYPE_GET(x) ((x) & (IFM_TMASK | _IFM_ETH_XTMASK))