linux/include/linux/if_arcnet.h
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   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 */
  59struct arc_rfc1201 {
  60    __u8  proto;                /* protocol ID field - varies           */
  61    __u8  split_flag;   /* for use with split packets           */
  62    __be16   sequence;          /* sequence number                      */
  63    __u8  payload[0];   /* space remaining in packet (504 bytes)*/
  64};
  65#define RFC1201_HDR_SIZE 4
  66
  67
  68/*
  69 * The RFC1051-specific components.
  70 */
  71struct arc_rfc1051 {
  72    __u8 proto;         /* ARC_P_RFC1051_ARP/RFC1051_IP */
  73    __u8 payload[0];            /* 507 bytes                    */
  74};
  75#define RFC1051_HDR_SIZE 1
  76
  77
  78/*
  79 * The ethernet-encap-specific components.  We have a real ethernet header
  80 * and some data.
  81 */
  82struct arc_eth_encap {
  83    __u8 proto;         /* Always ARC_P_ETHER                   */
  84    struct ethhdr eth;          /* standard ethernet header (yuck!)     */
  85    __u8 payload[0];            /* 493 bytes                            */
  86};
  87#define ETH_ENCAP_HDR_SIZE 14
  88
  89
  90struct arc_cap {
  91        __u8 proto;
  92        __u8 cookie[sizeof(int)];   /* Actually NOT sent over the network */
  93        union {
  94                __u8 ack;
  95                __u8 raw[0];            /* 507 bytes */
  96        } mes;
  97};
  98
  99/*
 100 * The data needed by the actual arcnet hardware.
 101 *
 102 * Now, in the real arcnet hardware, the third and fourth bytes are the
 103 * 'offset' specification instead of the length, and the soft data is at
 104 * the _end_ of the 512-byte buffer.  We hide this complexity inside the
 105 * driver.
 106 */
 107struct arc_hardware {
 108    __u8  source,               /* source ARCnet - filled in automagically */
 109             dest,              /* destination ARCnet - 0 for broadcast    */
 110             offset[2];         /* offset bytes (some weird semantics)     */
 111};
 112#define ARC_HDR_SIZE 4
 113
 114/*
 115 * This is an ARCnet frame header, as seen by the kernel (and userspace,
 116 * when you do a raw packet capture).
 117 */
 118struct archdr {
 119    /* hardware requirements */
 120    struct arc_hardware hard;
 121     
 122    /* arcnet encapsulation-specific bits */
 123    union {
 124        struct arc_rfc1201   rfc1201;
 125        struct arc_rfc1051   rfc1051;
 126        struct arc_eth_encap eth_encap;
 127        struct arc_cap       cap;
 128        __u8 raw[0];            /* 508 bytes                            */
 129    } soft;
 130};
 131
 132#endif                          /* _LINUX_IF_ARCNET_H */
 133
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