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��?�����N����m?����j����EP��https/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
/*
 * 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

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