FRM_F_CTL
FRM_F_CTL(x_f), \
if (FRM_F_CTL(frm) & 0x080000) {
(x_fhdr)->f_ctl = FRM_F_CTL(x_frm); \
FFM_F_CTL(FRM_F_CTL(frm), nfrm);
#define FRM_IS_LAST_FRAME(x_frm) (FRM_F_CTL(x_frm) & (1 << 19))
#define FRM_SENDER_IS_XCH_RESPONDER(x_frm) (FRM_F_CTL(x_frm) & (1 << 23))