FDDI_MAC_HDR_LEN
cp = virt + FDDI_MAC_HDR_LEN; // Point behind MAC header.
if (len < (int) (FDDI_MAC_HDR_LEN + RifLength)) {
for (n = FDDI_MAC_HDR_LEN; n; n--)
if (len != la_len || len < FDDI_MAC_HDR_LEN || !look_ahead) {