if_arcnet.h

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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/types.h>
#include <linux/if_ether.h>


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

/* CAP mode */
/* No macro but uses 1-8 */

/* 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 {
    __u8  proto;        /* protocol ID field - varies       */
    __u8  split_flag;   /* for use with split packets       */
    __be16   sequence;      /* sequence number          */
    __u8  payload[0];   /* space remaining in packet (504 bytes)*/
};
#define RFC1201_HDR_SIZE 4


/*
 * The RFC1051-specific components.
 */
struct arc_rfc1051 {
    __u8 proto;     /* ARC_P_RFC1051_ARP/RFC1051_IP */
    __u8 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 {
    __u8 proto;     /* Always ARC_P_ETHER           */
    struct ethhdr eth;      /* standard ethernet header (yuck!) */
    __u8 payload[0];        /* 493 bytes                */
};
#define ETH_ENCAP_HDR_SIZE 14


struct arc_cap {
    __u8 proto;
    __u8 cookie[sizeof(int)];   /* Actually NOT sent over the network */
    union {
        __u8 ack;
        __u8 raw[0];        /* 507 bytes */
    } mes;
};

/*
 * 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 {
    __u8  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;
    struct arc_cap       cap;
    __u8 raw[0];        /* 508 bytes                */
    } soft;
};

#endif              /* _LINUX_IF_ARCNET_H */