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/*
 * INET         An implementation of the TCP/IP protocol suite for the LINUX
 *              operating system.  INET is implemented using the  BSD Socket
 *              interface as the means of communication with the user level.
 *
 *              Global definitions for the ARCnet interface.
 *
 * Authors:     David Woodhouse and Avery Pennarun
 *
 *              This program is free software; you can redistribute it and/or
 *              modify it under the terms of the GNU General Public License
 *              as published by the Free Software Foundation; either version
 *              2 of the License, or (at your option) any later version.
 */

#ifndef _LINUX_IF_ARCNET_H
#define _LINUX_IF_ARCNET_H

#include <linux/if_ether.h>


/*
 *    These are the defined ARCnet Protocol ID's.
 */

/* RFC1201 Protocol ID's */
#define ARC_P_IP                212     /* 0xD4 */
#define ARC_P_IPV6              196     /* 0xC4: RFC2497 */
#define ARC_P_ARP               213     /* 0xD5 */
#define ARC_P_RARP              214     /* 0xD6 */
#define ARC_P_IPX               250     /* 0xFA */
#define ARC_P_NOVELL_EC         236     /* 0xEC */

/* Old RFC1051 Protocol ID's */
#define ARC_P_IP_RFC1051        240     /* 0xF0 */
#define ARC_P_ARP_RFC1051       241     /* 0xF1 */

/* MS LanMan/WfWg "NDIS" encapsulation */
#define ARC_P_ETHER             232     /* 0xE8 */

/* Unsupported/indirectly supported protocols */
#define ARC_P_DATAPOINT_BOOT    0       /* very old Datapoint equipment */
#define ARC_P_DATAPOINT_MOUNT   1
#define ARC_P_POWERLAN_BEACON   8       /* Probably ATA-Netbios related */
#define ARC_P_POWERLAN_BEACON2  243     /* 0xF3 */
#define ARC_P_LANSOFT           251     /* 0xFB - what is this? */
#define ARC_P_ATALK             0xDD

/* Hardware address length */
#define ARCNET_ALEN     1

/*
 * The RFC1201-specific components of an arcnet packet header.
 */
struct arc_rfc1201
{
    uint8_t  proto;             /* protocol ID field - varies           */
    uint8_t  split_flag;        /* for use with split packets           */
    uint16_t sequence;          /* sequence number                      */
    uint8_t  payload[0];        /* space remaining in packet (504 bytes)*/
};
#define RFC1201_HDR_SIZE 4


/*
 * The RFC1051-specific components.
 */
struct arc_rfc1051
{
    uint8_t proto;              /* ARC_P_RFC1051_ARP/RFC1051_IP */
    uint8_t payload[0];         /* 507 bytes                    */
};
#define RFC1051_HDR_SIZE 1


/*
 * The ethernet-encap-specific components.  We have a real ethernet header
 * and some data.
 */
struct arc_eth_encap
{
    uint8_t proto;              /* Always ARC_P_ETHER                   */
    struct ethhdr eth;          /* standard ethernet header (yuck!)     */
    uint8_t payload[0];         /* 493 bytes                            */
};
#define ETH_ENCAP_HDR_SIZE 14


/*
 * The data needed by the actual arcnet hardware.
 *
 * Now, in the real arcnet hardware, the third and fourth bytes are the
 * 'offset' specification instead of the length, and the soft data is at
 * the _end_ of the 512-byte buffer.  We hide this complexity inside the
 * driver.
 */
struct arc_hardware
{
    uint8_t  source,            /* source ARCnet - filled in automagically */
             dest,              /* destination ARCnet - 0 for broadcast    */
             offset[2];         /* offset bytes (some weird semantics)     */
};
#define ARC_HDR_SIZE 4

/*
 * This is an ARCnet frame header, as seen by the kernel (and userspace,
 * when you do a raw packet capture).
 */
struct archdr
{
    /* hardware requirements */
    struct arc_hardware hard;
     
    /* arcnet encapsulation-specific bits */
    union {
        struct arc_rfc1201   rfc1201;
        struct arc_rfc1051   rfc1051;
        struct arc_eth_encap eth_encap;
        uint8_t raw[0];         /* 508 bytes                            */
    } soft;
};

#endif                          /* _LINUX_IF_ARCNET_H */