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- /*
- * if_ppp.h - Point-to-Point Protocol definitions.
- *
- * Copyright (c) 1989 Carnegie Mellon University.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms are permitted
- * provided that the above copyright notice and this paragraph are
- * duplicated in all such forms and that any documentation,
- * advertising materials, and other materials related to such
- * distribution and use acknowledge that the software was developed
- * by Carnegie Mellon University. The name of the
- * University may not be used to endorse or promote products derived
- * from this software without specific prior written permission.
- * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
- * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
- * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
- */
-
- /*
- * Standard PPP header.
- */
- struct ppp_header {
- u_char ph_address; /* Address Field */
- u_char ph_control; /* Control Field */
- u_short ph_protocol; /* Protocol Field */
- };
-
- #define PPP_ALLSTATIONS 0xff /* All-Stations broadcast address */
- #define PPP_UI 0x03 /* Unnumbered Information */
- #define PPP_FLAG 0x7e /* Flag Sequence */
- #define PPP_ESCAPE 0x7d /* Asynchronous Control Escape */
- #define PPP_TRANS 0x20 /* Asynchronous transparency modifier */
-
- /*
- * Protocol types.
- */
- #define PPP_IP 0x21 /* Internet Protocol */
- #define PPP_XNS 0x25 /* Xerox NS */
-
- /*
- * Important FCS values.
- */
- #define PPP_INITFCS 0xffff /* Initial FCS value */
- #define PPP_GOODFCS 0xf0b8 /* Good final FCS value */
- #define PPP_FCS(fcs, c) (((fcs) >> 8) ^ fcstab[((fcs) ^ (c)) & 0xff])
-
- #define PPP_MTU 1500 /* Default MTU (size of Info field) */
- #define PPP_HIWAT 1000 /* Don't start a new packet if HIWAT on queue */
- #define CLISTRESERVE 1000 /* Can't let clists get too low */
-
-
- struct ppp_softc {
- struct ifnet sc_if; /* network-visible interface */
- short sc_flags; /* see below */
- short sc_ilen; /* length of input-packet-so-far */
- struct tty *sc_ttyp; /* pointer to tty structure */
- struct mbuf *sc_m; /* pointer to input mbuf chain */
- struct mbuf *sc_mc; /* pointer to current input mbuf */
- char *sc_mp; /* pointer to next char in input mbuf */
- u_short sc_fcs; /* FCS so far */
- u_long sc_asyncmap; /* async control character map */
- struct ifqueue sc_inq; /* TTY side input queue */
- };
-
- /* flags */
- #define SC_ESCAPED 0x0001 /* saw a PPP_ESCAPE */
- #define SC_FLUSH 0x0002 /* flush input until next PPP_FLAG */
-
- #define t_sc T_LINEP
-