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

     /*      $NetBSD: ppp_defs.h,v 1.14 2020/04/04 19:46:01 is Exp $ */
     /*      Id: ppp_defs.h,v 1.11 1997/04/30 05:46:24 paulus Exp    */
     
     /*
      * ppp_defs.h - PPP definitions.
      *
      * Copyright (c) 1989-2002 Paul Mackerras. All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
     * are met:
     *
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     *
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in
     *    the documentation and/or other materials provided with the
     *    distribution.
     *
     * 3. The name(s) of the authors of this software must not be used to
     *    endorse or promote products derived from this software without
     *    prior written permission.
     *
     * 4. Redistributions of any form whatsoever must retain the following
     *    acknowledgment:
     *    "This product includes software developed by Paul Mackerras
     *     <paulus@samba.org>".
     *
     * THE AUTHORS OF THIS SOFTWARE DISCLAIM ALL WARRANTIES WITH REGARD TO
     * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
     * AND FITNESS, IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
     * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
     * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
     * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
     * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
     */
    
    #ifndef _NET_PPP_DEFS_H_
    #define _NET_PPP_DEFS_H_
    
    /*
     * The basic PPP frame.
     */
    #define PPP_HDRLEN      4       /* octets for standard ppp header */
    #define PPP_FCSLEN      2       /* octets for FCS */
    
    /*
     * Packet sizes
     *
     * Note - lcp shouldn't be allowed to negotiate stuff outside these
     *        limits.  See lcp.h in the pppd directory.
     * (XXX - these constants should simply be shared by lcp.c instead
     *        of living in lcp.h)
     */
    #define PPP_MTU         1500    /* Default MTU (size of Info field) */
    #define PPP_MAXMTU      65535 - (PPP_HDRLEN + PPP_FCSLEN)
    #define PPP_MINMTU      64
    #define PPP_MRU         1500    /* default MRU = max length of info field */
    #define PPP_MAXMRU      65000   /* Largest MRU we allow */
    #define PPP_MINMRU      128
    
    #define PPP_ADDRESS(p)  (((const u_char *)(p))[0])
    #define PPP_CONTROL(p)  (((const u_char *)(p))[1])
    #define PPP_PROTOCOL(p) \
        ((((const u_char *)(p))[2] << 8) + ((const 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          0x0021          /* Internet Protocol */
    #define PPP_ISO         0x0023          /* ISO OSI Protocol */
    #define PPP_XNS         0x0025          /* Xerox NS Protocol */
    #define PPP_AT          0x0029          /* AppleTalk Protocol */
    #define PPP_IPX         0x002b          /* IPX protocol */
    #define PPP_VJC_COMP    0x002d          /* VJ compressed TCP */
    #define PPP_VJC_UNCOMP  0x002f          /* VJ uncompressed TCP */
    #define PPP_MP          0x003d          /* Multilink PPP Fragment */
    #define PPP_IPV6        0x0057          /* Internet Protocol Version 6 */
    #define PPP_COMP        0x00fd          /* 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_ECP         0x8053          /* Encryption 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          /* Crypto Handshake Auth. Protocol */
   #define PPP_CBCP        0xc029          /* Callback Control Protocol */
   #define PPP_EAP         0xc227          /* Extensible Authentication 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 */
   };
   
   #endif /* !_NET_PPP_DEFS_H_ */

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