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/*      $Id: ppp_defs.h,v 1.2 1994/09/21 01:31:06 paulus Exp $  */

/*

 * 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.

 */

/*

 *  ==FILEVERSION 20000114==

 *

 *  NOTE TO MAINTAINERS:

 *     If you modify this file at all, please set the above date.

 *     ppp_defs.h is shipped with a PPP distribution as well as with the kernel;

 *     if everyone increases the FILEVERSION number above, then scripts

 *     can do the right thing when deciding whether to install a new ppp_defs.h

 *     file.  Don't change the format of that line otherwise, so the

 *     installation script can recognize it.

 */

#ifndef _PPP_DEFS_H_

#define _PPP_DEFS_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)  (((__u8 *)(p))[0])

#define PPP_CONTROL(p)  (((__u8 *)(p))[1])

#define PPP_PROTOCOL(p) ((((__u8 *)(p))[2] << 8) + ((__u8 *)(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_MP          0x3d    /* Multilink protocol */

#define PPP_IPV6        0x57    /* Internet Protocol Version 6 */

#define PPP_COMPFRAG    0xfb    /* fragment compressed below bundle */

#define PPP_COMP        0xfd    /* compressed packet */

#define PPP_MPLS_UC     0x0281  /* Multi Protocol Label Switching - Unicast */

#define PPP_MPLS_MC     0x0283  /* Multi Protocol Label Switching - Multicast */

#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_CCPFRAG     0x80fb  /* CCP at link level (below MP bundle) */

#define PPP_CCP         0x80fd  /* Compression Control Protocol */

#define PPP_MPLSCP      0x80fd  /* MPLS 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 */

#ifdef __KERNEL__

#include <linux/crc-ccitt.h>

#define PPP_FCS(fcs, c) crc_ccitt_byte(fcs, c)

#endif

/*

 * Extended asyncmap - allows any character to be escaped.

 */

typedef __u32           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 for LQRP and pppstats

 */

struct pppstat  {

    __u32       ppp_discards;   /* # frames discarded */

    __u32       ppp_ibytes;     /* bytes received */

    __u32       ppp_ioctects;   /* bytes received not in error */

    __u32       ppp_ipackets;   /* packets received */

    __u32       ppp_ierrors;    /* receive errors */

    __u32       ppp_ilqrs;      /* # LQR frames received */

    __u32       ppp_obytes;     /* raw bytes sent */

    __u32       ppp_ooctects;   /* frame bytes sent */

    __u32       ppp_opackets;   /* packets sent */

    __u32       ppp_oerrors;    /* transmit errors */

    __u32       ppp_olqrs;      /* # LQR frames sent */

};

struct vjstat {

    __u32       vjs_packets;    /* outbound packets */

    __u32       vjs_compressed; /* outbound compressed packets */

    __u32       vjs_searches;   /* searches for connection state */

    __u32       vjs_misses;     /* times couldn't find conn. state */

    __u32       vjs_uncompressedin; /* inbound uncompressed packets */

    __u32       vjs_compressedin;   /* inbound compressed packets */

    __u32       vjs_errorin;    /* inbound unknown type packets */

    __u32       vjs_tossed;     /* inbound packets tossed because of error */

};

struct compstat {

    __u32       unc_bytes;      /* total uncompressed bytes */

    __u32       unc_packets;    /* total uncompressed packets */

    __u32       comp_bytes;     /* compressed bytes */

    __u32       comp_packets;   /* compressed packets */

    __u32       inc_bytes;      /* incompressible bytes */

    __u32       inc_packets;    /* incompressible packets */

    /* the compression ratio is defined as in_count / bytes_out */

    __u32       in_count;       /* Bytes received */

    __u32       bytes_out;      /* Bytes transmitted */

    double      ratio;          /* not computed in kernel. */

};

struct ppp_stats {

    struct pppstat      p;      /* basic PPP statistics */

    struct vjstat       vj;     /* VJ header compression statistics */

};

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 */

};

#endif /* _PPP_DEFS_H_ */