1/*
  2 * INET         An implementation of the TCP/IP protocol suite for the LINUX
  3 *              operating system.  INET is implemented using the  BSD Socket
  4 *              interface as the means of communication with the user level.
  5 *
  6 *              Global definitions for the ARCnet interface.
  7 *
  8 * Authors:     David Woodhouse and Avery Pennarun
  9 *
 10 *              This program is free software; you can redistribute it and/or
 11 *              modify it under the terms of the GNU General Public License
 12 *              as published by the Free Software Foundation; either version
 13 *              2 of the License, or (at your option) any later version.
 14 */
 15
 16#ifndef _LINUX_IF_ARCNET_H
 17#define _LINUX_IF_ARCNET_H
 18
 19#include <linux/types.h>
 20#include <linux/if_ether.h>
 21
 22
 23/*
 24 *    These are the defined ARCnet Protocol ID's.
 25 */
 26
 27/* CAP mode */
 28/* No macro but uses 1-8 */
 29
 30/* RFC1201 Protocol ID's */
 31#define ARC_P_IP		212	/* 0xD4 */
 32#define ARC_P_IPV6		196	/* 0xC4: RFC2497 */
 33#define ARC_P_ARP		213	/* 0xD5 */
 34#define ARC_P_RARP		214	/* 0xD6 */
 35#define ARC_P_IPX		250	/* 0xFA */
 36#define ARC_P_NOVELL_EC		236	/* 0xEC */
 37
 38/* Old RFC1051 Protocol ID's */
 39#define ARC_P_IP_RFC1051	240	/* 0xF0 */
 40#define ARC_P_ARP_RFC1051	241	/* 0xF1 */
 41
 42/* MS LanMan/WfWg "NDIS" encapsulation */
 43#define ARC_P_ETHER		232	/* 0xE8 */
 44
 45/* Unsupported/indirectly supported protocols */
 46#define ARC_P_DATAPOINT_BOOT	0	/* very old Datapoint equipment */
 47#define ARC_P_DATAPOINT_MOUNT	1
 48#define ARC_P_POWERLAN_BEACON	8	/* Probably ATA-Netbios related */
 49#define ARC_P_POWERLAN_BEACON2	243	/* 0xF3 */
 50#define ARC_P_LANSOFT		251	/* 0xFB - what is this? */
 51#define ARC_P_ATALK		0xDD
 52
 53/* Hardware address length */
 54#define ARCNET_ALEN	1
 55
 56/*
 57 * The RFC1201-specific components of an arcnet packet header.
 58 */
 59struct arc_rfc1201 {
 60    __u8  proto;		/* protocol ID field - varies		*/
 61    __u8  split_flag;	/* for use with split packets		*/
 62    __be16   sequence;		/* sequence number			*/
 63    __u8  payload[0];	/* space remaining in packet (504 bytes)*/
 64};
 65#define RFC1201_HDR_SIZE 4
 66
 67
 68/*
 69 * The RFC1051-specific components.
 70 */
 71struct arc_rfc1051 {
 72    __u8 proto;		/* ARC_P_RFC1051_ARP/RFC1051_IP	*/
 73    __u8 payload[0];		/* 507 bytes			*/
 74};
 75#define RFC1051_HDR_SIZE 1
 76
 77
 78/*
 79 * The ethernet-encap-specific components.  We have a real ethernet header
 80 * and some data.
 81 */
 82struct arc_eth_encap {
 83    __u8 proto;		/* Always ARC_P_ETHER			*/
 84    struct ethhdr eth;		/* standard ethernet header (yuck!)	*/
 85    __u8 payload[0];		/* 493 bytes				*/
 86};
 87#define ETH_ENCAP_HDR_SIZE 14
 88
 89
 90struct arc_cap {
 91	__u8 proto;
 92	__u8 cookie[sizeof(int)];   /* Actually NOT sent over the network */
 93	union {
 94		__u8 ack;
 95		__u8 raw[0];		/* 507 bytes */
 96	} mes;
 97};
 98
 99/*
100 * The data needed by the actual arcnet hardware.
101 *
102 * Now, in the real arcnet hardware, the third and fourth bytes are the
103 * 'offset' specification instead of the length, and the soft data is at
104 * the _end_ of the 512-byte buffer.  We hide this complexity inside the
105 * driver.
106 */
107struct arc_hardware {
108    __u8  source,		/* source ARCnet - filled in automagically */
109             dest,		/* destination ARCnet - 0 for broadcast    */
110    	     offset[2];		/* offset bytes (some weird semantics)     */
111};
112#define ARC_HDR_SIZE 4
113
114/*
115 * This is an ARCnet frame header, as seen by the kernel (and userspace,
116 * when you do a raw packet capture).
117 */
118struct archdr {
119    /* hardware requirements */
120    struct arc_hardware hard;
121     
122    /* arcnet encapsulation-specific bits */
123    union {
124	struct arc_rfc1201   rfc1201;
125	struct arc_rfc1051   rfc1051;
126	struct arc_eth_encap eth_encap;
127	struct arc_cap       cap;
128	__u8 raw[0];		/* 508 bytes				*/
129    } soft;
130};
131
132#endif				/* _LINUX_IF_ARCNET_H */