1/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
2/*
3 * INET         An implementation of the TCP/IP protocol suite for the LINUX
4 *              operating system.  INET is implemented using the  BSD Socket
5 *              interface as the means of communication with the user level.
6 *
7 *              Global definitions for the ARCnet interface.
8 *
9 * Authors:     David Woodhouse and Avery Pennarun
10 *
11 *              This program is free software; you can redistribute it and/or
12 *              modify it under the terms of the GNU General Public License
13 *              as published by the Free Software Foundation; either version
14 *              2 of the License, or (at your option) any later version.
15 */
16
17#ifndef _LINUX_IF_ARCNET_H
18#define _LINUX_IF_ARCNET_H
19
20#include <linux/types.h>
21#include <linux/if_ether.h>
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[];	/* space remaining in packet (504 bytes)*/
64};
65#define RFC1201_HDR_SIZE 4
66
67/*
68 * The RFC1051-specific components.
69 */
70struct arc_rfc1051 {
71	__u8 proto;		/* ARC_P_RFC1051_ARP/RFC1051_IP	*/
72	__u8 payload[];	/* 507 bytes			*/
73};
74#define RFC1051_HDR_SIZE 1
75
76/*
77 * The ethernet-encap-specific components.  We have a real ethernet header
78 * and some data.
79 */
80struct arc_eth_encap {
81	__u8 proto;		/* Always ARC_P_ETHER			*/
82	struct ethhdr eth;	/* standard ethernet header (yuck!)	*/
83	__u8 payload[];	/* 493 bytes				*/
84};
85#define ETH_ENCAP_HDR_SIZE 14
86
87struct arc_cap {
88	__u8 proto;
89	__u8 cookie[sizeof(int)];
90				/* Actually NOT sent over the network */
91	union {
92		__u8 ack;
93		__u8 raw[0];	/* 507 bytes */
94	} mes;
95};
96
97/*
98 * The data needed by the actual arcnet hardware.
99 *
100 * Now, in the real arcnet hardware, the third and fourth bytes are the
101 * 'offset' specification instead of the length, and the soft data is at
102 * the _end_ of the 512-byte buffer.  We hide this complexity inside the
103 * driver.
104 */
105struct arc_hardware {
106	__u8 source;		/* source ARCnet - filled in automagically */
107	__u8 dest;		/* destination ARCnet - 0 for broadcast    */
108	__u8 offset[2];		/* offset bytes (some weird semantics)     */
109};
110#define ARC_HDR_SIZE 4
111
112/*
113 * This is an ARCnet frame header, as seen by the kernel (and userspace,
114 * when you do a raw packet capture).
115 */
116struct archdr {
117	/* hardware requirements */
118	struct arc_hardware hard;
119
120	/* arcnet encapsulation-specific bits */
121	union {
122		struct arc_rfc1201   rfc1201;
123		struct arc_rfc1051   rfc1051;
124		struct arc_eth_encap eth_encap;
125		struct arc_cap       cap;
126		__u8 raw[0];	/* 508 bytes				*/
127	} soft;
128};
129
130#endif				/* _LINUX_IF_ARCNET_H */
131