/*

 * 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.

 */

/* 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

{

    uint8_t  proto;		/* protocol ID field - varies		*/

    uint8_t  split_flag;	/* for use with split packets		*/

    __be16   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

struct arc_cap

{

	uint8_t proto;

	uint8_t cookie[sizeof(int)];   /* Actually NOT sent over the network */

	union {

		uint8_t ack;

		uint8_t 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

{

    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;

	struct arc_cap       cap;

	uint8_t raw[0];		/* 508 bytes				*/

    } soft;

};

#endif				/* _LINUX_IF_ARCNET_H */