The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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

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    1 /*
    2  * ppp_defs.h - PPP definitions.
    3  */
    4 /*-
    5  * Copyright (c) 1994 The Australian National University.
    6  * All rights reserved.
    7  *
    8  * Permission to use, copy, modify, and distribute this software and its
    9  * documentation is hereby granted, provided that the above copyright
   10  * notice appears in all copies.  This software is provided without any
   11  * warranty, express or implied. The Australian National University
   12  * makes no representations about the suitability of this software for
   13  * any purpose.
   14  *
   15  * IN NO EVENT SHALL THE AUSTRALIAN NATIONAL UNIVERSITY BE LIABLE TO ANY
   16  * PARTY FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
   17  * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF
   18  * THE AUSTRALIAN NATIONAL UNIVERSITY HAVE BEEN ADVISED OF THE POSSIBILITY
   19  * OF SUCH DAMAGE.
   20  *
   21  * THE AUSTRALIAN NATIONAL UNIVERSITY SPECIFICALLY DISCLAIMS ANY WARRANTIES,
   22  * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
   23  * AND FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
   24  * ON AN "AS IS" BASIS, AND THE AUSTRALIAN NATIONAL UNIVERSITY HAS NO
   25  * OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS,
   26  * OR MODIFICATIONS.
   27  *
   28  * $FreeBSD$
   29  */
   30 
   31 #ifndef _PPP_DEFS_H_
   32 #define _PPP_DEFS_H_
   33 
   34 /*
   35  * The basic PPP frame.
   36  */
   37 #define PPP_HDRLEN      4       /* octets for standard ppp header */
   38 #define PPP_FCSLEN      2       /* octets for FCS */
   39 #define PPP_MRU         1500    /* default MRU = max length of info field */
   40 
   41 #define PPP_ADDRESS(p)  (((u_char *)(p))[0])
   42 #define PPP_CONTROL(p)  (((u_char *)(p))[1])
   43 #define PPP_PROTOCOL(p) ((((u_char *)(p))[2] << 8) + ((u_char *)(p))[3])
   44 
   45 /*
   46  * Significant octet values.
   47  */
   48 #define PPP_ALLSTATIONS 0xff    /* All-Stations broadcast address */
   49 #define PPP_UI          0x03    /* Unnumbered Information */
   50 #define PPP_FLAG        0x7e    /* Flag Sequence */
   51 #define PPP_ESCAPE      0x7d    /* Asynchronous Control Escape */
   52 #define PPP_TRANS       0x20    /* Asynchronous transparency modifier */
   53 
   54 /*
   55  * Protocol field values.
   56  */
   57 #define PPP_IP          0x21    /* Internet Protocol */
   58 #define PPP_XNS         0x25    /* Xerox NS */
   59 #define PPP_AT          0x29    /* AppleTalk Protocol */
   60 #define PPP_IPX         0x2b    /* IPX Datagram (RFC1552) */
   61 #define PPP_VJC_COMP    0x2d    /* VJ compressed TCP */
   62 #define PPP_VJC_UNCOMP  0x2f    /* VJ uncompressed TCP */
   63 #define PPP_COMP        0xfd    /* compressed packet */
   64 #define PPP_IPCP        0x8021  /* IP Control Protocol */
   65 #define PPP_ATCP        0x8029  /* AppleTalk Control Protocol */
   66 #define PPP_IPXCP       0x802b  /* IPX Control Protocol (RFC1552) */
   67 #define PPP_CCP         0x80fd  /* Compression Control Protocol */
   68 #define PPP_LCP         0xc021  /* Link Control Protocol */
   69 #define PPP_PAP         0xc023  /* Password Authentication Protocol */
   70 #define PPP_LQR         0xc025  /* Link Quality Report protocol */
   71 #define PPP_CHAP        0xc223  /* Cryptographic Handshake Auth. Protocol */
   72 #define PPP_CBCP        0xc029  /* Callback Control Protocol */
   73 #define PPP_IPV6        0x57    /* Internet Protocol version 6*/
   74 #define PPP_IPV6CP      0x8057  /* IPv6 Control Protocol */
   75 
   76 /*
   77  * Values for FCS calculations.
   78  */
   79 #define PPP_INITFCS     0xffff  /* Initial FCS value */
   80 #define PPP_GOODFCS     0xf0b8  /* Good final FCS value */
   81 #define PPP_FCS(fcs, c) (((fcs) >> 8) ^ fcstab[((fcs) ^ (c)) & 0xff])
   82 
   83 /*
   84  * Extended asyncmap - allows any character to be escaped.
   85  */
   86 typedef u_int32_t       ext_accm[8];
   87 
   88 /*
   89  * What to do with network protocol (NP) packets.
   90  */
   91 enum NPmode {
   92     NPMODE_PASS,                /* pass the packet through */
   93     NPMODE_DROP,                /* silently drop the packet */
   94     NPMODE_ERROR,               /* return an error */
   95     NPMODE_QUEUE                /* save it up for later. */
   96 };
   97 
   98 /*
   99  * Statistics.
  100  */
  101 struct pppstat  {
  102     unsigned int ppp_ibytes;    /* bytes received */
  103     unsigned int ppp_ipackets;  /* packets received */
  104     unsigned int ppp_ierrors;   /* receive errors */
  105     unsigned int ppp_obytes;    /* bytes sent */
  106     unsigned int ppp_opackets;  /* packets sent */
  107     unsigned int ppp_oerrors;   /* transmit errors */
  108 };
  109 
  110 struct vjstat {
  111     unsigned int vjs_packets;   /* outbound packets */
  112     unsigned int vjs_compressed; /* outbound compressed packets */
  113     unsigned int vjs_searches;  /* searches for connection state */
  114     unsigned int vjs_misses;    /* times couldn't find conn. state */
  115     unsigned int vjs_uncompressedin; /* inbound uncompressed packets */
  116     unsigned int vjs_compressedin; /* inbound compressed packets */
  117     unsigned int vjs_errorin;   /* inbound unknown type packets */
  118     unsigned int vjs_tossed;    /* inbound packets tossed because of error */
  119 };
  120 
  121 struct ppp_stats {
  122     struct pppstat p;           /* basic PPP statistics */
  123     struct vjstat vj;           /* VJ header compression statistics */
  124 };
  125 
  126 struct compstat {
  127     unsigned int unc_bytes;     /* total uncompressed bytes */
  128     unsigned int unc_packets;   /* total uncompressed packets */
  129     unsigned int comp_bytes;    /* compressed bytes */
  130     unsigned int comp_packets;  /* compressed packets */
  131     unsigned int inc_bytes;     /* incompressible bytes */
  132     unsigned int inc_packets;   /* incompressible packets */
  133     unsigned int ratio;         /* recent compression ratio << 8 */
  134 };
  135 
  136 struct ppp_comp_stats {
  137     struct compstat c;          /* packet compression statistics */
  138     struct compstat d;          /* packet decompression statistics */
  139 };
  140 
  141 /*
  142  * The following structure records the time in seconds since
  143  * the last NP packet was sent or received.
  144  */
  145 struct ppp_idle {
  146     time_t xmit_idle;           /* time since last NP packet sent */
  147     time_t recv_idle;           /* time since last NP packet received */
  148 };
  149 
  150 #ifndef __P
  151 #ifdef __STDC__
  152 #define __P(x)  x
  153 #else
  154 #define __P(x)  ()
  155 #endif
  156 #endif
  157 
  158 #endif /* _PPP_DEFS_H_ */

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