ppp_defs.h

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/*
 * ppp_defs.h - PPP definitions.
 *
 * Copyright (c) 1994 The Australian National University.
 * All rights reserved.
 *
 * Permission to use, copy, modify, and distribute this software and its
 * documentation is hereby granted, provided that the above copyright
 * notice appears in all copies.  This software is provided without any
 * warranty, express or implied. The Australian National University
 * makes no representations about the suitability of this software for
 * any purpose.
 *
 * IN NO EVENT SHALL THE AUSTRALIAN NATIONAL UNIVERSITY BE LIABLE TO ANY
 * PARTY FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF
 * THE AUSTRALIAN NATIONAL UNIVERSITY HAVE BEEN ADVISED OF THE POSSIBILITY
 * OF SUCH DAMAGE.
 *
 * THE AUSTRALIAN NATIONAL UNIVERSITY SPECIFICALLY DISCLAIMS ANY WARRANTIES,
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
 * AND FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
 * ON AN "AS IS" BASIS, AND THE AUSTRALIAN NATIONAL UNIVERSITY HAS NO
 * OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS,
 * OR MODIFICATIONS.
 *
 * $FreeBSD: src/sys/net/ppp_defs.h,v 1.8 2005/01/07 01:45:35 imp Exp $
 */


#ifndef _PPP_DEFS_H_
#define _PPP_DEFS_H_

#include <stdint.h>

/*
 * The basic PPP frame.
 */
#define PPP_HDRLEN      4       /* octets for standard ppp header */
#define PPP_FCSLEN      2       /* octets for FCS */
#define PPP_MRU         1500    /* default MRU = max length of info field */

#define PPP_ADDRESS(p)  (((u_char *)(p))[0])
#define PPP_CONTROL(p)  (((u_char *)(p))[1])
#define PPP_PROTOCOL(p) ((((u_char *)(p))[2] << 8) + ((u_char *)(p))[3])

/*
 * Significant octet values.
 */
#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 field values.
 */
#define PPP_IP          0x21    /* Internet Protocol */
#define PPP_AT          0x29    /* AppleTalk Protocol */
#define PPP_IPX         0x2b    /* IPX protocol */
#define PPP_VJC_COMP    0x2d    /* VJ compressed TCP */
#define PPP_VJC_UNCOMP  0x2f    /* VJ uncompressed TCP */
#define PPP_IPV6        0x57    /* Internet Protocol Version 6 */
#define PPP_COMP        0xfd    /* compressed packet */
#define PPP_IPCP        0x8021  /* IP Control Protocol */
#define PPP_ATCP        0x8029  /* AppleTalk Control Protocol */
#define PPP_IPXCP       0x802b  /* IPX Control Protocol */
#define PPP_IPV6CP      0x8057  /* IPv6 Control Protocol */
#define PPP_CCP         0x80fd  /* Compression Control Protocol */
#define PPP_LCP         0xc021  /* Link Control Protocol */
#define PPP_PAP         0xc023  /* Password Authentication Protocol */
#define PPP_LQR         0xc025  /* Link Quality Report protocol */
#define PPP_CHAP        0xc223  /* Cryptographic Handshake Auth. Protocol */
#define PPP_CBCP        0xc029  /* Callback Control Protocol */

/*
 * Values for FCS calculations.
 */
#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])

/*
 * Extended asyncmap - allows any character to be escaped.
 */
typedef uint32_t        ext_accm[8];

/*
 * What to do with network protocol (NP) packets.
 */
enum NPmode {
    NPMODE_PASS,                /* pass the packet through */
    NPMODE_DROP,                /* silently drop the packet */
    NPMODE_ERROR,               /* return an error */
    NPMODE_QUEUE                /* save it up for later. */
};

/*
 * Statistics.
 */
struct pppstat  {
    unsigned int ppp_ibytes;    /* bytes received */
    unsigned int ppp_ipackets;  /* packets received */
    unsigned int ppp_ierrors;   /* receive errors */
    unsigned int ppp_obytes;    /* bytes sent */
    unsigned int ppp_opackets;  /* packets sent */
    unsigned int ppp_oerrors;   /* transmit errors */
};

struct vjstat {
    unsigned int vjs_packets;   /* outbound packets */
    unsigned int vjs_compressed; /* outbound compressed packets */
    unsigned int vjs_searches;  /* searches for connection state */
    unsigned int vjs_misses;    /* times couldn't find conn. state */
    unsigned int vjs_uncompressedin; /* inbound uncompressed packets */
    unsigned int vjs_compressedin; /* inbound compressed packets */
    unsigned int vjs_errorin;   /* inbound unknown type packets */
    unsigned int vjs_tossed;    /* inbound packets tossed because of error */
};

struct ppp_stats {
    struct pppstat p;           /* basic PPP statistics */
    struct vjstat vj;           /* VJ header compression statistics */
};

struct compstat {
    unsigned int unc_bytes;     /* total uncompressed bytes */
    unsigned int unc_packets;   /* total uncompressed packets */
    unsigned int comp_bytes;    /* compressed bytes */
    unsigned int comp_packets;  /* compressed packets */
    unsigned int inc_bytes;     /* incompressible bytes */
    unsigned int inc_packets;   /* incompressible packets */
    unsigned int ratio;         /* recent compression ratio << 8 */
};

struct ppp_comp_stats {
    struct compstat c;          /* packet compression statistics */
    struct compstat d;          /* packet decompression statistics */
};

/*
 * The following structure records the time in seconds since
 * the last NP packet was sent or received.
 */
struct ppp_idle {
    time_t xmit_idle;           /* time since last NP packet sent */
    time_t recv_idle;           /* time since last NP packet received */
};

#ifndef __P
#ifdef __STDC__
#define __P(x)  x
#else
#define __P(x)  ()
#endif
#endif

#endif /* _PPP_DEFS_H_ */