include/linux/if_arcnet.h

   1 /*
   2  * INET         An implementation of the TCP/IP protocol suite for the LINUX
   3  *              operating system.  INET is implemented using the  BSD Socket
   4  *              interface as the means of communication with the user level.
   5  *
   6  *              Global definitions for the ARCnet interface.
   7  *
   8  * Authors:     David Woodhouse and Avery Pennarun
   9  *
  10  *              This program is free software; you can redistribute it and/or
  11  *              modify it under the terms of the GNU General Public License
  12  *              as published by the Free Software Foundation; either version
  13  *              2 of the License, or (at your option) any later version.
  14  */
  15
  16 #ifndef _LINUX_IF_ARCNET_H
  17 #define _LINUX_IF_ARCNET_H
  18
  19 #include <linux/if_ether.h>
  20
  21
  22 /*
  23  *    These are the defined ARCnet Protocol ID's.
  24  */
  25
  26 /* CAP mode */
  27 /* No macro but uses 1-8 */
  28
  29 /* RFC1201 Protocol ID's */
  30 #define ARC_P_IP                212     /* 0xD4 */
  31 #define ARC_P_IPV6              196     /* 0xC4: RFC2497 */
  32 #define ARC_P_ARP               213     /* 0xD5 */
  33 #define ARC_P_RARP              214     /* 0xD6 */
  34 #define ARC_P_IPX               250     /* 0xFA */
  35 #define ARC_P_NOVELL_EC         236     /* 0xEC */
  36
  37 /* Old RFC1051 Protocol ID's */
  38 #define ARC_P_IP_RFC1051        240     /* 0xF0 */
  39 #define ARC_P_ARP_RFC1051       241     /* 0xF1 */
  40
  41 /* MS LanMan/WfWg "NDIS" encapsulation */
  42 #define ARC_P_ETHER             232     /* 0xE8 */
  43
  44 /* Unsupported/indirectly supported protocols */
  45 #define ARC_P_DATAPOINT_BOOT    0       /* very old Datapoint equipment */
  46 #define ARC_P_DATAPOINT_MOUNT   1
  47 #define ARC_P_POWERLAN_BEACON   8       /* Probably ATA-Netbios related */
  48 #define ARC_P_POWERLAN_BEACON2  243     /* 0xF3 */
  49 #define ARC_P_LANSOFT           251     /* 0xFB - what is this? */
  50 #define ARC_P_ATALK             0xDD
  51
  52 /* Hardware address length */
  53 #define ARCNET_ALEN     1
  54
  55 /*
  56  * The RFC1201-specific components of an arcnet packet header.
  57  */
  58 struct arc_rfc1201
  59 {
  60     uint8_t  proto;             /* protocol ID field - varies           */
  61     uint8_t  split_flag;        /* for use with split packets           */
  62     __be16   sequence;          /* sequence number                      */
  63     uint8_t  payload[0];        /* space remaining in packet (504 bytes)*/
  64 };
  65 #define RFC1201_HDR_SIZE 4
  66
  67
  68 /*
  69  * The RFC1051-specific components.
  70  */
  71 struct arc_rfc1051
  72 {
  73     uint8_t proto;              /* ARC_P_RFC1051_ARP/RFC1051_IP */
  74     uint8_t payload[0];         /* 507 bytes                    */
  75 };
  76 #define RFC1051_HDR_SIZE 1
  77
  78
  79 /*
  80  * The ethernet-encap-specific components.  We have a real ethernet header
  81  * and some data.
  82  */
  83 struct arc_eth_encap
  84 {
  85     uint8_t proto;              /* Always ARC_P_ETHER                   */
  86     struct ethhdr eth;          /* standard ethernet header (yuck!)     */
  87     uint8_t payload[0];         /* 493 bytes                            */
  88 };
  89 #define ETH_ENCAP_HDR_SIZE 14
  90
  91
  92 struct arc_cap
  93 {
  94         uint8_t proto;
  95         uint8_t cookie[sizeof(int)];   /* Actually NOT sent over the network */
  96         union {
  97                 uint8_t ack;
  98                 uint8_t raw[0];         /* 507 bytes */
  99         } mes;
 100 };
 101
 102 /*
 103  * The data needed by the actual arcnet hardware.
 104  *
 105  * Now, in the real arcnet hardware, the third and fourth bytes are the
 106  * 'offset' specification instead of the length, and the soft data is at
 107  * the _end_ of the 512-byte buffer.  We hide this complexity inside the
 108  * driver.
 109  */
 110 struct arc_hardware
 111 {
 112     uint8_t  source,            /* source ARCnet - filled in automagically */
 113              dest,              /* destination ARCnet - 0 for broadcast    */
 114              offset[2];         /* offset bytes (some weird semantics)     */
 115 };
 116 #define ARC_HDR_SIZE 4
 117
 118 /*
 119  * This is an ARCnet frame header, as seen by the kernel (and userspace,
 120  * when you do a raw packet capture).
 121  */
 122 struct archdr
 123 {
 124     /* hardware requirements */
 125     struct arc_hardware hard;
 126
 127     /* arcnet encapsulation-specific bits */
 128     union {
 129         struct arc_rfc1201   rfc1201;
 130         struct arc_rfc1051   rfc1051;
 131         struct arc_eth_encap eth_encap;
 132         struct arc_cap       cap;
 133         uint8_t raw[0];         /* 508 bytes                            */
 134     } soft;
 135 };
 136
 137 #endif                          /* _LINUX_IF_ARCNET_H */