sys/netatalk/ddp.h

   1 /*      $NetBSD: ddp.h,v 1.1 1997/04/02 21:31:08 christos Exp $  */
   2
   3 /*
   4  * Copyright (c) 1990,1991 Regents of The University of Michigan.
   5  * All Rights Reserved.
   6  *
   7  * Permission to use, copy, modify, and distribute this software and
   8  * its documentation for any purpose and without fee is hereby granted,
   9  * provided that the above copyright notice appears in all copies and
  10  * that both that copyright notice and this permission notice appear
  11  * in supporting documentation, and that the name of The University
  12  * of Michigan not be used in advertising or publicity pertaining to
  13  * distribution of the software without specific, written prior
  14  * permission. This software is supplied as is without expressed or
  15  * implied warranties of any kind.
  16  *
  17  * This product includes software developed by the University of
  18  * California, Berkeley and its contributors.
  19  *
  20  *      Research Systems Unix Group
  21  *      The University of Michigan
  22  *      c/o Wesley Craig
  23  *      535 W. William Street
  24  *      Ann Arbor, Michigan
  25  *      +1-313-764-2278
  26  *      netatalk@umich.edu
  27  */
  28
  29 #ifndef _NETATALK_DDP_H_
  30 #define _NETATALK_DDP_H_
  31
  32 #ifndef BYTE_ORDER
  33   #error "Undefined Byte order"
  34 #endif
  35
  36 /*
  37  * <-1byte(8bits) ->
  38  * +---------------+
  39  * | 0 | hopc  |len|
  40  * +---------------+
  41  * | len (cont)    |
  42  * +---------------+
  43  * |               |
  44  * +- DDP csum    -+
  45  * |               |
  46  * +---------------+
  47  * |               |
  48  * +- Dest NET    -+
  49  * |               |
  50  * +---------------+
  51  * |               |
  52  * +- Src NET     -+
  53  * |               |
  54  * +---------------+
  55  * | Dest NODE     |
  56  * +---------------+
  57  * | Src NODE      |
  58  * +---------------+
  59  * | Dest PORT     |
  60  * +---------------+
  61  * | Src PORT      |
  62  * +---------------+
  63  *
  64  * On Apples, there is also a ddp_type field, after src_port. However,
  65  * under this unix implementation, user level processes need to be able
  66  * to set the ddp_type. In later revisions, the ddp_type may only be
  67  * available in a raw_appletalk interface.
  68  */
  69
  70 struct elaphdr {
  71         u_char          el_dnode;
  72         u_char          el_snode;
  73         u_char          el_type;
  74 };
  75
  76 #define SZ_ELAPHDR      3
  77
  78 #define ELAP_DDPSHORT   0x01
  79 #define ELAP_DDPEXTEND  0x02
  80
  81 /*
  82  * Extended DDP header. Includes sickness for dealing with arbitrary
  83  * bitfields on a little-endian arch.
  84  */
  85 struct ddpehdr {
  86         union {
  87                 struct {
  88 #if BYTE_ORDER == BIG_ENDIAN
  89                         unsigned        dub_pad:2;
  90                         unsigned        dub_hops:4;
  91                         unsigned        dub_len:10;
  92                         unsigned        dub_sum:16;
  93 #endif
  94 #if BYTE_ORDER == LITTLE_ENDIAN
  95                         unsigned        dub_sum:16;
  96                         unsigned        dub_len:10;
  97                         unsigned        dub_hops:4;
  98                         unsigned        dub_pad:2;
  99 #endif
 100                 }               du_bits;
 101                 unsigned        du_bytes;
 102         }               deh_u;
 103 #define deh_pad         deh_u.du_bits.dub_pad
 104 #define deh_hops        deh_u.du_bits.dub_hops
 105 #define deh_len         deh_u.du_bits.dub_len
 106 #define deh_sum         deh_u.du_bits.dub_sum
 107 #define deh_bytes       deh_u.du_bytes
 108         u_short         deh_dnet;
 109         u_short         deh_snet;
 110         u_char          deh_dnode;
 111         u_char          deh_snode;
 112         u_char          deh_dport;
 113         u_char          deh_sport;
 114 };
 115
 116 #define DDP_MAXHOPS     15
 117
 118 struct ddpshdr {
 119         union {
 120                 struct {
 121 #if BYTE_ORDER == BIG_ENDIAN
 122                         unsigned        dub_pad:6;
 123                         unsigned        dub_len:10;
 124                         unsigned        dub_dport:8;
 125                         unsigned        dub_sport:8;
 126 #endif
 127 #if BYTE_ORDER == LITTLE_ENDIAN
 128                         unsigned        dub_sport:8;
 129                         unsigned        dub_dport:8;
 130                         unsigned        dub_len:10;
 131                         unsigned        dub_pad:6;
 132 #endif
 133                 }               du_bits;
 134                 unsigned        du_bytes;
 135         }               dsh_u;
 136 #define dsh_pad         dsh_u.du_bits.dub_pad
 137 #define dsh_len         dsh_u.du_bits.dub_len
 138 #define dsh_dport       dsh_u.du_bits.dub_dport
 139 #define dsh_sport       dsh_u.du_bits.dub_sport
 140 #define dsh_bytes       dsh_u.du_bytes
 141 };
 142
 143 #endif /* !_NETATALK_DDP_H_ */