104 lines
3.7 KiB
C
104 lines
3.7 KiB
C
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/*
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* if_ppp.h - Point-to-Point Protocol definitions.
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*
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* Copyright (c) 1989 Carnegie Mellon University.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms are permitted
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* provided that the above copyright notice and this paragraph are
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* duplicated in all such forms and that any documentation,
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* advertising materials, and other materials related to such
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* distribution and use acknowledge that the software was developed
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* by Carnegie Mellon University. The name of the
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* University may not be used to endorse or promote products derived
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* from this software without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
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* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*
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* Modified by Paul Mackerras (paulus@cs.anu.edu.au)
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* PPP_MRU added, PPP_MTU changed to 296 (default only), added sc_outm.
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*
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* $Id: if_ppp.h,v 1.1 1993/08/14 06:38:38 deraadt Exp $
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*/
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/* Portions Copyright (C) 1990 Brad K. Clements (streams support)
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* (huh? there isn't any streams support in this file)
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*/
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/*
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* Standard PPP header.
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*/
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struct ppp_header {
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u_char ph_address; /* Address Field */
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u_char ph_control; /* Control Field */
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u_short ph_protocol; /* Protocol Field */
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};
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#define PPP_ALLSTATIONS 0xff /* All-Stations broadcast address */
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#define PPP_UI 0x03 /* Unnumbered Information */
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#define PPP_FLAG 0x7e /* Flag Sequence */
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#define PPP_ESCAPE 0x7d /* Asynchronous Control Escape */
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#define PPP_TRANS 0x20 /* Asynchronous transparency modifier */
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/*
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* Protocol types.
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*/
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#define PPP_IP 0x21 /* Internet Protocol */
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#define PPP_XNS 0x25 /* Xerox NS */
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#define PPP_VJC_COMP 0x2d /* VJ compressed TCP */
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#define PPP_VJC_UNCOMP 0x2f /* VJ uncompressed TCP */
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#define PPP_LCP 0xc021 /* Link Control Protocol */
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/*
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* Important FCS values.
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*/
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#define PPP_INITFCS 0xffff /* Initial FCS value */
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#define PPP_GOODFCS 0xf0b8 /* Good final FCS value */
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#define PPP_FCS(fcs, c) (((fcs) >> 8) ^ fcstab[((fcs) ^ (c)) & 0xff])
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#define PPP_MTU 296 /* Default MTU (size of Info field) */
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#define PPP_MRU 1500 /* Default MRU (max receive unit) */
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#define PPP_HIWAT 400 /* Don't start a new packet if HIWAT on que */
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struct ppp_softc {
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struct ifnet sc_if; /* network-visible interface */
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u_int sc_flags; /* see below */
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struct tty *sc_ttyp; /* pointer to tty structure */
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struct mbuf *sc_outm; /* mbuf chain being output currently */
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struct mbuf *sc_m; /* pointer to input mbuf chain */
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struct mbuf *sc_mc; /* pointer to current input mbuf */
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char *sc_mp; /* pointer to next char in input mbuf */
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short sc_ilen; /* length of input-packet-so-far */
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u_short sc_fcs; /* FCS so far */
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u_long sc_asyncmap; /* async control character map */
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struct ifqueue sc_inq; /* TTY side input queue */
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#ifdef VJC
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struct slcompress sc_comp; /* vjc control buffer */
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#endif
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u_int sc_bytessent;
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u_int sc_bytesrcvd;
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};
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/* flags */
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#define SC_ESCAPED 0x00010000 /* saw a PPP_ESCAPE */
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#define SC_FLUSH 0x00020000 /* flush input until next PPP_FLAG */
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#define SC_COMP_PROT 0x00000001 /* protocol compression */
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#define SC_COMP_AC 0x00000002 /* header compression */
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#define SC_COMP_TCP 0x00000004 /* TCP traffic (VJ) compression */
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#define t_sc T_LINEP
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/* this stuff doesn't belong here... */
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#define PPPIOCGFLAGS _IOR('t', 90, int) /* get configuration flags */
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#define PPPIOCSFLAGS _IOW('t', 89, int) /* set configuration flags */
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#define PPPIOCGASYNCMAP _IOR('t', 88, int) /* get async map */
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#define PPPIOCSASYNCMAP _IOW('t', 87, int) /* set async map */
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#define PPPIOCGUNIT _IOR('t', 86, int) /* get ppp unit number */
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/* old copies of PPP may have defined this */
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#if !defined(ifr_mtu)
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#define ifr_mtu ifr_metric
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#endif
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