LXR linux/include/uapi/linux/if

   1/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
   2/*
   3 * INET         An implementation of the TCP/IP protocol suite for the LINUX
   4 *              operating system.  INET is implemented using the  BSD Socket
   5 *              interface as the means of communication with the user level.
   6 *
   7 *              Global definitions for the ARCnet interface.
   8 *
   9 * Authors:     David Woodhouse and Avery Pennarun
  10 *
  11 *              This program is free software; you can redistribute it and/or
  12 *              modify it under the terms of the GNU General Public License
  13 *              as published by the Free Software Foundation; either version
  14 *              2 of the License, or (at your option) any later version.
  15 */
  16
  17#ifndef _LINUX_IF_ARCNET_H
  18#define _LINUX_IF_ARCNET_H
  19
  20#include <linux/types.h>
  21#include <linux/if_ether.h>
  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 * The RFC1051-specific components.
  69 */
  70struct arc_rfc1051 {
  71        __u8 proto;             /* ARC_P_RFC1051_ARP/RFC1051_IP */
  72        __u8 payload[0];        /* 507 bytes                    */
  73};
  74#define RFC1051_HDR_SIZE 1
  75
  76/*
  77 * The ethernet-encap-specific components.  We have a real ethernet header
  78 * and some data.
  79 */
  80struct arc_eth_encap {
  81        __u8 proto;             /* Always ARC_P_ETHER                   */
  82        struct ethhdr eth;      /* standard ethernet header (yuck!)     */
  83        __u8 payload[0];        /* 493 bytes                            */
  84};
  85#define ETH_ENCAP_HDR_SIZE 14
  86
  87struct arc_cap {
  88        __u8 proto;
  89        __u8 cookie[sizeof(int)];
  90                                /* Actually NOT sent over the network */
  91        union {
  92                __u8 ack;
  93                __u8 raw[0];    /* 507 bytes */
  94        } mes;
  95};
  96
  97/*
  98 * The data needed by the actual arcnet hardware.
  99 *
 100 * Now, in the real arcnet hardware, the third and fourth bytes are the
 101 * 'offset' specification instead of the length, and the soft data is at
 102 * the _end_ of the 512-byte buffer.  We hide this complexity inside the
 103 * driver.
 104 */
 105struct arc_hardware {
 106        __u8 source;            /* source ARCnet - filled in automagically */
 107        __u8 dest;              /* destination ARCnet - 0 for broadcast    */
 108        __u8 offset[2];         /* offset bytes (some weird semantics)     */
 109};
 110#define ARC_HDR_SIZE 4
 111
 112/*
 113 * This is an ARCnet frame header, as seen by the kernel (and userspace,
 114 * when you do a raw packet capture).
 115 */
 116struct archdr {
 117        /* hardware requirements */
 118        struct arc_hardware hard;
 119
 120        /* arcnet encapsulation-specific bits */
 121        union {
 122                struct arc_rfc1201   rfc1201;
 123                struct arc_rfc1051   rfc1051;
 124                struct arc_eth_encap eth_encap;
 125                struct arc_cap       cap;
 126                __u8 raw[0];    /* 508 bytes                            */
 127        } soft;
 128};
 129
 130#endif                          /* _LINUX_IF_ARCNET_H */
 131