FreeBSD/Linux Kernel Cross Reference
sys/net/ppp_defs.h

     /*
      * 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: releng/5.0/sys/net/ppp_defs.h 78064 2001-06-11 12:39:29Z ume $
     */
    
    #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)  (((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_XNS         0x25    /* Xerox NS */
    #define PPP_AT          0x29    /* AppleTalk Protocol */
    #define PPP_IPX         0x2b    /* IPX Datagram (RFC1552) */
    #define PPP_VJC_COMP    0x2d    /* VJ compressed TCP */
    #define PPP_VJC_UNCOMP  0x2f    /* VJ uncompressed TCP */
    #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 (RFC1552) */
    #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 */
    #define PPP_IPV6        0x57    /* Internet Protocol version 6*/
    #define PPP_IPV6CP      0x8057  /* IPv6 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 u_int32_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_ */

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