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 ANSI FDDI interface.
8 *
9 * Version: @(#)if_fddi.h 1.0.3 Oct 6 2018
10 *
11 * Author: Lawrence V. Stefani, <stefani@yahoo.com>
12 * Maintainer: Maciej W. Rozycki, <macro@orcam.me.uk>
13 *
14 * if_fddi.h is based on previous if_ether.h and if_tr.h work by
15 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
16 * Donald Becker, <becker@super.org>
17 * Alan Cox, <alan@lxorguk.ukuu.org.uk>
18 * Steve Whitehouse, <gw7rrm@eeshack3.swan.ac.uk>
19 * Peter De Schrijver, <stud11@cc4.kuleuven.ac.be>
20 *
21 * This program is free software; you can redistribute it and/or
22 * modify it under the terms of the GNU General Public License
23 * as published by the Free Software Foundation; either version
24 * 2 of the License, or (at your option) any later version.
25 */
26#ifndef _LINUX_IF_FDDI_H
27#define _LINUX_IF_FDDI_H
28
29#include <linux/types.h>
30
31/*
32 * Define max and min legal sizes. The frame sizes do not include
33 * 4 byte FCS/CRC (frame check sequence).
34 */
35#define FDDI_K_ALEN 6 /* Octets in one FDDI address */
36#define FDDI_K_8022_HLEN 16 /* Total octets in 802.2 header */
37#define FDDI_K_SNAP_HLEN 21 /* Total octets in 802.2 SNAP header */
38#define FDDI_K_8022_ZLEN 16 /* Min octets in 802.2 frame sans
39 FCS */
40#define FDDI_K_SNAP_ZLEN 21 /* Min octets in 802.2 SNAP frame sans
41 FCS */
42#define FDDI_K_8022_DLEN 4475 /* Max octets in 802.2 payload */
43#define FDDI_K_SNAP_DLEN 4470 /* Max octets in 802.2 SNAP payload */
44#define FDDI_K_LLC_ZLEN 13 /* Min octets in LLC frame sans FCS */
45#define FDDI_K_LLC_LEN 4491 /* Max octets in LLC frame sans FCS */
46#define FDDI_K_OUI_LEN 3 /* Octets in OUI in 802.2 SNAP
47 header */
48
49/* Define FDDI Frame Control (FC) Byte masks */
50#define FDDI_FC_K_CLASS_MASK 0x80 /* class bit */
51#define FDDI_FC_K_CLASS_SYNC 0x80
52#define FDDI_FC_K_CLASS_ASYNC 0x00
53#define FDDI_FC_K_ALEN_MASK 0x40 /* address length bit */
54#define FDDI_FC_K_ALEN_48 0x40
55#define FDDI_FC_K_ALEN_16 0x00
56#define FDDI_FC_K_FORMAT_MASK 0x30 /* format bits */
57#define FDDI_FC_K_FORMAT_FUTURE 0x30
58#define FDDI_FC_K_FORMAT_IMPLEMENTOR 0x20
59#define FDDI_FC_K_FORMAT_LLC 0x10
60#define FDDI_FC_K_FORMAT_MANAGEMENT 0x00
61#define FDDI_FC_K_CONTROL_MASK 0x0f /* control bits */
62
63/* Define FDDI Frame Control (FC) Byte specific values */
64#define FDDI_FC_K_VOID 0x00
65#define FDDI_FC_K_NON_RESTRICTED_TOKEN 0x80
66#define FDDI_FC_K_RESTRICTED_TOKEN 0xC0
67#define FDDI_FC_K_SMT_MIN 0x41
68#define FDDI_FC_K_SMT_MAX 0x4F
69#define FDDI_FC_K_MAC_MIN 0xC1
70#define FDDI_FC_K_MAC_MAX 0xCF
71#define FDDI_FC_K_ASYNC_LLC_MIN 0x50
72#define FDDI_FC_K_ASYNC_LLC_DEF 0x54
73#define FDDI_FC_K_ASYNC_LLC_MAX 0x5F
74#define FDDI_FC_K_SYNC_LLC_MIN 0xD0
75#define FDDI_FC_K_SYNC_LLC_MAX 0xD7
76#define FDDI_FC_K_IMPLEMENTOR_MIN 0x60
77#define FDDI_FC_K_IMPLEMENTOR_MAX 0x6F
78#define FDDI_FC_K_RESERVED_MIN 0x70
79#define FDDI_FC_K_RESERVED_MAX 0x7F
80
81/* Define LLC and SNAP constants */
82#define FDDI_EXTENDED_SAP 0xAA
83#define FDDI_UI_CMD 0x03
84
85/* Define 802.2 Type 1 header */
86struct fddi_8022_1_hdr {
87 __u8 dsap; /* destination service access point */
88 __u8 ssap; /* source service access point */
89 __u8 ctrl; /* control byte #1 */
90} __attribute__((packed));
91
92/* Define 802.2 Type 2 header */
93struct fddi_8022_2_hdr {
94 __u8 dsap; /* destination service access point */
95 __u8 ssap; /* source service access point */
96 __u8 ctrl_1; /* control byte #1 */
97 __u8 ctrl_2; /* control byte #2 */
98} __attribute__((packed));
99
100/* Define 802.2 SNAP header */
101struct fddi_snap_hdr {
102 __u8 dsap; /* always 0xAA */
103 __u8 ssap; /* always 0xAA */
104 __u8 ctrl; /* always 0x03 */
105 __u8 oui[FDDI_K_OUI_LEN]; /* organizational universal id */
106 __be16 ethertype; /* packet type ID field */
107} __attribute__((packed));
108
109/* Define FDDI LLC frame header */
110struct fddihdr {
111 __u8 fc; /* frame control */
112 __u8 daddr[FDDI_K_ALEN]; /* destination address */
113 __u8 saddr[FDDI_K_ALEN]; /* source address */
114 union {
115 struct fddi_8022_1_hdr llc_8022_1;
116 struct fddi_8022_2_hdr llc_8022_2;
117 struct fddi_snap_hdr llc_snap;
118 } hdr;
119} __attribute__((packed));
120
121
122#endif /* _LINUX_IF_FDDI_H */