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/types.h>
  20 #include <linux/if_ether.h>
  21
  22
  23 /*
  24  *    These are the defined ARCnet Protocol ID's.
  25  */
  26
  27 /* CAP mode */
  28 /* No macro but uses 1-8 */
  29
  30 /* RFC1201 Protocol ID's */
  31 #define ARC_P_IP                212     /* 0xD4 */
  32 #define ARC_P_IPV6              196     /* 0xC4: RFC2497 */
  33 #define ARC_P_ARP               213     /* 0xD5 */
  34 #define ARC_P_RARP              214     /* 0xD6 */
  35 #define ARC_P_IPX               250     /* 0xFA */
  36 #define ARC_P_NOVELL_EC         236     /* 0xEC */
  37
  38 /* Old RFC1051 Protocol ID's */
  39 #define ARC_P_IP_RFC1051        240     /* 0xF0 */
  40 #define ARC_P_ARP_RFC1051       241     /* 0xF1 */
  41
  42 /* MS LanMan/WfWg "NDIS" encapsulation */
  43 #define ARC_P_ETHER             232     /* 0xE8 */
  44
  45 /* Unsupported/indirectly supported protocols */
  46 #define ARC_P_DATAPOINT_BOOT    0       /* very old Datapoint equipment */
  47 #define ARC_P_DATAPOINT_MOUNT   1
  48 #define ARC_P_POWERLAN_BEACON   8       /* Probably ATA-Netbios related */
  49 #define ARC_P_POWERLAN_BEACON2  243     /* 0xF3 */
  50 #define ARC_P_LANSOFT           251     /* 0xFB - what is this? */
  51 #define ARC_P_ATALK             0xDD
  52
  53 /* Hardware address length */
  54 #define ARCNET_ALEN     1
  55
  56 /*
  57  * The RFC1201-specific components of an arcnet packet header.
  58  */
  59 struct arc_rfc1201
  60 {
  61     __u8  proto;                /* protocol ID field - varies           */
  62     __u8  split_flag;   /* for use with split packets           */
  63     __be16   sequence;          /* sequence number                      */
  64     __u8  payload[0];   /* space remaining in packet (504 bytes)*/
  65 };
  66 #define RFC1201_HDR_SIZE 4
  67
  68
  69 /*
  70  * The RFC1051-specific components.
  71  */
  72 struct arc_rfc1051
  73 {
  74     __u8 proto;         /* ARC_P_RFC1051_ARP/RFC1051_IP */
  75     __u8 payload[0];            /* 507 bytes                    */
  76 };
  77 #define RFC1051_HDR_SIZE 1
  78
  79
  80 /*
  81  * The ethernet-encap-specific components.  We have a real ethernet header
  82  * and some data.
  83  */
  84 struct arc_eth_encap
  85 {
  86     __u8 proto;         /* Always ARC_P_ETHER                   */
  87     struct ethhdr eth;          /* standard ethernet header (yuck!)     */
  88     __u8 payload[0];            /* 493 bytes                            */
  89 };
  90 #define ETH_ENCAP_HDR_SIZE 14
  91
  92
  93 struct arc_cap
  94 {
  95         __u8 proto;
  96         __u8 cookie[sizeof(int)];   /* Actually NOT sent over the network */
  97         union {
  98                 __u8 ack;
  99                 __u8 raw[0];            /* 507 bytes */
 100         } mes;
 101 };
 102
 103 /*
 104  * The data needed by the actual arcnet hardware.
 105  *
 106  * Now, in the real arcnet hardware, the third and fourth bytes are the
 107  * 'offset' specification instead of the length, and the soft data is at
 108  * the _end_ of the 512-byte buffer.  We hide this complexity inside the
 109  * driver.
 110  */
 111 struct arc_hardware
 112 {
 113     __u8  source,               /* source ARCnet - filled in automagically */
 114              dest,              /* destination ARCnet - 0 for broadcast    */
 115              offset[2];         /* offset bytes (some weird semantics)     */
 116 };
 117 #define ARC_HDR_SIZE 4
 118
 119 /*
 120  * This is an ARCnet frame header, as seen by the kernel (and userspace,
 121  * when you do a raw packet capture).
 122  */
 123 struct archdr
 124 {
 125     /* hardware requirements */
 126     struct arc_hardware hard;
 127
 128     /* arcnet encapsulation-specific bits */
 129     union {
 130         struct arc_rfc1201   rfc1201;
 131         struct arc_rfc1051   rfc1051;
 132         struct arc_eth_encap eth_encap;
 133         struct arc_cap       cap;
 134         __u8 raw[0];            /* 508 bytes                            */
 135     } soft;
 136 };
 137
 138 #endif                          /* _LINUX_IF_ARCNET_H */