IFM_NMASK
switch (ifmr.ifm_active & IFM_NMASK) {
switch (ifmr.ifm_active & IFM_NMASK) {
int ifmedia_masked = ifmedia & (IFM_GMASK | IFM_NMASK | IFM_TMASK);
#define IFM_TYPE(x) ((x) & IFM_NMASK)
switch (ifmr.ifm_active & IFM_NMASK) {