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     __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  */
  71 struct 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  */
  82 struct 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
  90 struct 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  */
 107 struct 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  */
 118 struct 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 */