include/uapi/linux/if_arcnet.h

   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  */
  59 struct 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  */
  70 struct 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  */
  80 struct 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
  87 struct 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  */
 105 struct 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  */
 116 struct 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 */