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422 giacomo 1
/*
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 * INET         An implementation of the TCP/IP protocol suite for the LINUX
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 *              operating system.  INET is implemented using the  BSD Socket
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 *              interface as the means of communication with the user level.
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 *
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 *              Global definitions for the ARCnet interface.
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 *
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 * Authors:     David Woodhouse and Avery Pennarun
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 *
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 *              This program is free software; you can redistribute it and/or
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 *              modify it under the terms of the GNU General Public License
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 *              as published by the Free Software Foundation; either version
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 *              2 of the License, or (at your option) any later version.
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 */
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#ifndef _LINUX_IF_ARCNET_H
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#define _LINUX_IF_ARCNET_H
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#include <linux/if_ether.h>
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/*
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 *    These are the defined ARCnet Protocol ID's.
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 */
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/* RFC1201 Protocol ID's */
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#define ARC_P_IP                212     /* 0xD4 */
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#define ARC_P_IPV6              196     /* 0xC4: RFC2497 */
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#define ARC_P_ARP               213     /* 0xD5 */
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#define ARC_P_RARP              214     /* 0xD6 */
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#define ARC_P_IPX               250     /* 0xFA */
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#define ARC_P_NOVELL_EC         236     /* 0xEC */
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/* Old RFC1051 Protocol ID's */
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#define ARC_P_IP_RFC1051        240     /* 0xF0 */
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#define ARC_P_ARP_RFC1051       241     /* 0xF1 */
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/* MS LanMan/WfWg "NDIS" encapsulation */
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#define ARC_P_ETHER             232     /* 0xE8 */
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/* Unsupported/indirectly supported protocols */
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#define ARC_P_DATAPOINT_BOOT    0       /* very old Datapoint equipment */
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#define ARC_P_DATAPOINT_MOUNT   1
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#define ARC_P_POWERLAN_BEACON   8       /* Probably ATA-Netbios related */
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#define ARC_P_POWERLAN_BEACON2  243     /* 0xF3 */
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#define ARC_P_LANSOFT           251     /* 0xFB - what is this? */
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#define ARC_P_ATALK             0xDD
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/* Hardware address length */
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#define ARCNET_ALEN     1
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/*
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 * The RFC1201-specific components of an arcnet packet header.
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 */
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struct arc_rfc1201
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{
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    uint8_t  proto;             /* protocol ID field - varies           */
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    uint8_t  split_flag;        /* for use with split packets           */
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    uint16_t sequence;          /* sequence number                      */
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    uint8_t  payload[0];        /* space remaining in packet (504 bytes)*/
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};
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#define RFC1201_HDR_SIZE 4
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/*
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 * The RFC1051-specific components.
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 */
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struct arc_rfc1051
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{
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    uint8_t proto;              /* ARC_P_RFC1051_ARP/RFC1051_IP */
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    uint8_t payload[0];         /* 507 bytes                    */
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};
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#define RFC1051_HDR_SIZE 1
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/*
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 * The ethernet-encap-specific components.  We have a real ethernet header
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 * and some data.
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 */
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struct arc_eth_encap
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{
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    uint8_t proto;              /* Always ARC_P_ETHER                   */
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    struct ethhdr eth;          /* standard ethernet header (yuck!)     */
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    uint8_t payload[0];         /* 493 bytes                            */
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};
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#define ETH_ENCAP_HDR_SIZE 14
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/*
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 * The data needed by the actual arcnet hardware.
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 *
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 * Now, in the real arcnet hardware, the third and fourth bytes are the
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 * 'offset' specification instead of the length, and the soft data is at
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 * the _end_ of the 512-byte buffer.  We hide this complexity inside the
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 * driver.
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 */
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struct arc_hardware
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{
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    uint8_t  source,            /* source ARCnet - filled in automagically */
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             dest,              /* destination ARCnet - 0 for broadcast    */
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             offset[2];         /* offset bytes (some weird semantics)     */
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};
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#define ARC_HDR_SIZE 4
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/*
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 * This is an ARCnet frame header, as seen by the kernel (and userspace,
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 * when you do a raw packet capture).
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 */
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struct archdr
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{
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    /* hardware requirements */
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    struct arc_hardware hard;
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    /* arcnet encapsulation-specific bits */
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    union {
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        struct arc_rfc1201   rfc1201;
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        struct arc_rfc1051   rfc1051;
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        struct arc_eth_encap eth_encap;
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        uint8_t raw[0];         /* 508 bytes                            */
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    } soft;
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};
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#endif                          /* _LINUX_IF_ARCNET_H */