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