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/if_ether.h>
20
21
22/*
23 *    These are the defined ARCnet Protocol ID's.
24 */
25
26/* CAP mode */
27/* No macro but uses 1-8 */
28
29/* RFC1201 Protocol ID's */
30#define ARC_P_IP		212	/* 0xD4 */
31#define ARC_P_IPV6		196	/* 0xC4: RFC2497 */
32#define ARC_P_ARP		213	/* 0xD5 */
33#define ARC_P_RARP		214	/* 0xD6 */
34#define ARC_P_IPX		250	/* 0xFA */
35#define ARC_P_NOVELL_EC		236	/* 0xEC */
36
37/* Old RFC1051 Protocol ID's */
38#define ARC_P_IP_RFC1051	240	/* 0xF0 */
39#define ARC_P_ARP_RFC1051	241	/* 0xF1 */
40
41/* MS LanMan/WfWg "NDIS" encapsulation */
42#define ARC_P_ETHER		232	/* 0xE8 */
43
44/* Unsupported/indirectly supported protocols */
45#define ARC_P_DATAPOINT_BOOT	0	/* very old Datapoint equipment */
46#define ARC_P_DATAPOINT_MOUNT	1
47#define ARC_P_POWERLAN_BEACON	8	/* Probably ATA-Netbios related */
48#define ARC_P_POWERLAN_BEACON2	243	/* 0xF3 */
49#define ARC_P_LANSOFT		251	/* 0xFB - what is this? */
50#define ARC_P_ATALK		0xDD
51
52/* Hardware address length */
53#define ARCNET_ALEN	1
54
55/*
56 * The RFC1201-specific components of an arcnet packet header.
57 */
58struct arc_rfc1201
59{
60    uint8_t  proto;		/* protocol ID field - varies		*/
61    uint8_t  split_flag;	/* for use with split packets		*/
62    uint16_t sequence;		/* sequence number			*/
63    uint8_t  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{
73    uint8_t proto;		/* ARC_P_RFC1051_ARP/RFC1051_IP	*/
74    uint8_t payload[0];		/* 507 bytes			*/
75};
76#define RFC1051_HDR_SIZE 1
77
78
79/*
80 * The ethernet-encap-specific components.  We have a real ethernet header
81 * and some data.
82 */
83struct arc_eth_encap
84{
85    uint8_t proto;		/* Always ARC_P_ETHER			*/
86    struct ethhdr eth;		/* standard ethernet header (yuck!)	*/
87    uint8_t payload[0];		/* 493 bytes				*/
88};
89#define ETH_ENCAP_HDR_SIZE 14
90
91
92struct arc_cap
93{
94	uint8_t proto;
95	uint8_t cookie[sizeof(int)];   /* Actually NOT sent over the network */
96	union {
97		uint8_t ack;
98		uint8_t raw[0];		/* 507 bytes */
99	} mes;
100};
101
102/*
103 * The data needed by the actual arcnet hardware.
104 *
105 * Now, in the real arcnet hardware, the third and fourth bytes are the
106 * 'offset' specification instead of the length, and the soft data is at
107 * the _end_ of the 512-byte buffer.  We hide this complexity inside the
108 * driver.
109 */
110struct arc_hardware
111{
112    uint8_t  source,		/* source ARCnet - filled in automagically */
113             dest,		/* destination ARCnet - 0 for broadcast    */
114    	     offset[2];		/* offset bytes (some weird semantics)     */
115};
116#define ARC_HDR_SIZE 4
117
118/*
119 * This is an ARCnet frame header, as seen by the kernel (and userspace,
120 * when you do a raw packet capture).
121 */
122struct archdr
123{
124    /* hardware requirements */
125    struct arc_hardware hard;
126
127    /* arcnet encapsulation-specific bits */
128    union {
129	struct arc_rfc1201   rfc1201;
130	struct arc_rfc1051   rfc1051;
131	struct arc_eth_encap eth_encap;
132	struct arc_cap       cap;
133	uint8_t raw[0];		/* 508 bytes				*/
134    } soft;
135};
136
137#endif				/* _LINUX_IF_ARCNET_H */
138