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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{
61 __u8 proto; /* protocol ID field - varies */
62 __u8 split_flag; /* for use with split packets */
63 __be16 sequence; /* sequence number */
64 __u8 payload[0]; /* space remaining in packet (504 bytes)*/
65};
66#define RFC1201_HDR_SIZE 4
67
68
69/*
70 * The RFC1051-specific components.
71 */
72struct arc_rfc1051
73{
74 __u8 proto; /* ARC_P_RFC1051_ARP/RFC1051_IP */
75 __u8 payload[0]; /* 507 bytes */
76};
77#define RFC1051_HDR_SIZE 1
78
79
80/*
81 * The ethernet-encap-specific components. We have a real ethernet header
82 * and some data.
83 */
84struct arc_eth_encap
85{
86 __u8 proto; /* Always ARC_P_ETHER */
87 struct ethhdr eth; /* standard ethernet header (yuck!) */
88 __u8 payload[0]; /* 493 bytes */
89};
90#define ETH_ENCAP_HDR_SIZE 14
91
92
93struct arc_cap
94{
95 __u8 proto;
96 __u8 cookie[sizeof(int)]; /* Actually NOT sent over the network */
97 union {
98 __u8 ack;
99 __u8 raw[0]; /* 507 bytes */
100 } mes;
101};
102
103/*
104 * The data needed by the actual arcnet hardware.
105 *
106 * Now, in the real arcnet hardware, the third and fourth bytes are the
107 * 'offset' specification instead of the length, and the soft data is at
108 * the _end_ of the 512-byte buffer. We hide this complexity inside the
109 * driver.
110 */
111struct arc_hardware
112{
113 __u8 source, /* source ARCnet - filled in automagically */
114 dest, /* destination ARCnet - 0 for broadcast */
115 offset[2]; /* offset bytes (some weird semantics) */
116};
117#define ARC_HDR_SIZE 4
118
119/*
120 * This is an ARCnet frame header, as seen by the kernel (and userspace,
121 * when you do a raw packet capture).
122 */
123struct archdr
124{
125 /* hardware requirements */
126 struct arc_hardware hard;
127
128 /* arcnet encapsulation-specific bits */
129 union {
130 struct arc_rfc1201 rfc1201;
131 struct arc_rfc1051 rfc1051;
132 struct arc_eth_encap eth_encap;
133 struct arc_cap cap;
134 __u8 raw[0]; /* 508 bytes */
135 } soft;
136};
137
138#endif /* _LINUX_IF_ARCNET_H */