/*
   * 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 */