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 /* RFC1201 Protocol ID's */
  27 #define ARC_P_IP                212     /* 0xD4 */
  28 #define ARC_P_IPV6              196     /* 0xC4: RFC2497 */
  29 #define ARC_P_ARP               213     /* 0xD5 */
  30 #define ARC_P_RARP              214     /* 0xD6 */
  31 #define ARC_P_IPX               250     /* 0xFA */
  32 #define ARC_P_NOVELL_EC         236     /* 0xEC */
  33
  34 /* Old RFC1051 Protocol ID's */
  35 #define ARC_P_IP_RFC1051        240     /* 0xF0 */
  36 #define ARC_P_ARP_RFC1051       241     /* 0xF1 */
  37
  38 /* MS LanMan/WfWg "NDIS" encapsulation */
  39 #define ARC_P_ETHER             232     /* 0xE8 */
  40
  41 /* Unsupported/indirectly supported protocols */
  42 #define ARC_P_DATAPOINT_BOOT    0       /* very old Datapoint equipment */
  43 #define ARC_P_DATAPOINT_MOUNT   1
  44 #define ARC_P_POWERLAN_BEACON   8       /* Probably ATA-Netbios related */
  45 #define ARC_P_POWERLAN_BEACON2  243     /* 0xF3 */
  46 #define ARC_P_LANSOFT           251     /* 0xFB - what is this? */
  47 #define ARC_P_ATALK             0xDD
  48
  49 /* Hardware address length */
  50 #define ARCNET_ALEN     1
  51
  52 /*
  53  * The RFC1201-specific components of an arcnet packet header.
  54  */
  55 struct arc_rfc1201
  56 {
  57     uint8_t  proto;             /* protocol ID field - varies           */
  58     uint8_t  split_flag;        /* for use with split packets           */
  59     uint16_t sequence;          /* sequence number                      */
  60     uint8_t  payload[0];        /* space remaining in packet (504 bytes)*/
  61 };
  62 #define RFC1201_HDR_SIZE 4
  63
  64
  65 /*
  66  * The RFC1051-specific components.
  67  */
  68 struct arc_rfc1051
  69 {
  70     uint8_t proto;              /* ARC_P_RFC1051_ARP/RFC1051_IP */
  71     uint8_t payload[0];         /* 507 bytes                    */
  72 };
  73 #define RFC1051_HDR_SIZE 1
  74
  75
  76 /*
  77  * The ethernet-encap-specific components.  We have a real ethernet header
  78  * and some data.
  79  */
  80 struct arc_eth_encap
  81 {
  82     uint8_t proto;              /* Always ARC_P_ETHER                   */
  83     struct ethhdr eth;          /* standard ethernet header (yuck!)     */
  84     uint8_t payload[0];         /* 493 bytes                            */
  85 };
  86 #define ETH_ENCAP_HDR_SIZE 14
  87
  88
  89 /*
  90  * The data needed by the actual arcnet hardware.
  91  *
  92  * Now, in the real arcnet hardware, the third and fourth bytes are the
  93  * 'offset' specification instead of the length, and the soft data is at
  94  * the _end_ of the 512-byte buffer.  We hide this complexity inside the
  95  * driver.
  96  */
  97 struct arc_hardware
  98 {
  99     uint8_t  source,            /* source ARCnet - filled in automagically */
 100              dest,              /* destination ARCnet - 0 for broadcast    */
 101              offset[2];         /* offset bytes (some weird semantics)     */
 102 };
 103 #define ARC_HDR_SIZE 4
 104
 105 /*
 106  * This is an ARCnet frame header, as seen by the kernel (and userspace,
 107  * when you do a raw packet capture).
 108  */
 109 struct archdr
 110 {
 111     /* hardware requirements */
 112     struct arc_hardware hard;
 113
 114     /* arcnet encapsulation-specific bits */
 115     union {
 116         struct arc_rfc1201   rfc1201;
 117         struct arc_rfc1051   rfc1051;
 118         struct arc_eth_encap eth_encap;
 119         uint8_t raw[0];         /* 508 bytes                            */
 120     } soft;
 121 };
 122
 123 #endif                          /* _LINUX_IF_ARCNET_H */