MSG_BYTE
code = MSG_BYTE(mp, 0);
if (MSG_BYTE(mp, 1) == PPP_UI) {
code = MSG_BYTE(mp, 2);
MSG_BYTE(mp, 3) == (PPP_LCP & 0xFF)) {
#define LCP_USE_DFLT(mp) ((code = MSG_BYTE((mp), 4)) < 9 || code > 11)
proto = MSG_BYTE(mp, i);
proto = MSG_BYTE(mp, i);
proto = (proto << 8) + MSG_BYTE(mp, i);
proto = MSG_BYTE(mp, 0);
proto = (proto << 8) + MSG_BYTE(mp, 1);
proto = MSG_BYTE(mp, 0);
proto = MSG_BYTE(mp, 2);
proto = (proto << 8) + MSG_BYTE(mp, i);
MSG_BYTE(mp, PPP_HDRLEN+offsetof(struct ip, ip_p)) ==