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 */
58 struct arc_rfc1201
59 {
60 uint8_t proto; /* protocol ID field - varies */
61 uint8_t split_flag; /* for use with split packets */
62 __be16 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 */
71 struct 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 */
83 struct 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
92 struct 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 */
110 struct 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 */
122 struct 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
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