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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 1.0.2 Sep 29 2004
10 *
11 * Author: Lawrence V. Stefani, <stefani@lkg.dec.com>
12 *
13 * if_fddi.h is based on previous if_ether.h and if_tr.h work by
14 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
15 * Donald Becker, <becker@super.org>
16 * Alan Cox, <alan@lxorguk.ukuu.org.uk>
17 * Steve Whitehouse, <gw7rrm@eeshack3.swan.ac.uk>
18 * Peter De Schrijver, <stud11@cc4.kuleuven.ac.be>
19 *
20 * This program is free software; you can redistribute it and/or
21 * modify it under the terms of the GNU General Public License
22 * as published by the Free Software Foundation; either version
23 * 2 of the License, or (at your option) any later version.
24 */
25#ifndef _UAPI_LINUX_IF_FDDI_H
26#define _UAPI_LINUX_IF_FDDI_H
27
28#include <linux/types.h>
29
30/*
31 * Define max and min legal sizes. The frame sizes do not include
32 * 4 byte FCS/CRC (frame check sequence).
33 */
34#define FDDI_K_ALEN 6 /* Octets in one FDDI address */
35#define FDDI_K_8022_HLEN 16 /* Total octets in 802.2 header */
36#define FDDI_K_SNAP_HLEN 21 /* Total octets in 802.2 SNAP header */
37#define FDDI_K_8022_ZLEN 16 /* Min octets in 802.2 frame sans
38 FCS */
39#define FDDI_K_SNAP_ZLEN 21 /* Min octets in 802.2 SNAP frame sans
40 FCS */
41#define FDDI_K_8022_DLEN 4475 /* Max octets in 802.2 payload */
42#define FDDI_K_SNAP_DLEN 4470 /* Max octets in 802.2 SNAP payload */
43#define FDDI_K_LLC_ZLEN 13 /* Min octets in LLC frame sans FCS */
44#define FDDI_K_LLC_LEN 4491 /* Max octets in LLC frame sans FCS */
45#define FDDI_K_OUI_LEN 3 /* Octets in OUI in 802.2 SNAP
46 header */
47
48/* Define FDDI Frame Control (FC) Byte values */
49#define FDDI_FC_K_VOID 0x00
50#define FDDI_FC_K_NON_RESTRICTED_TOKEN 0x80
51#define FDDI_FC_K_RESTRICTED_TOKEN 0xC0
52#define FDDI_FC_K_SMT_MIN 0x41
53#define FDDI_FC_K_SMT_MAX 0x4F
54#define FDDI_FC_K_MAC_MIN 0xC1
55#define FDDI_FC_K_MAC_MAX 0xCF
56#define FDDI_FC_K_ASYNC_LLC_MIN 0x50
57#define FDDI_FC_K_ASYNC_LLC_DEF 0x54
58#define FDDI_FC_K_ASYNC_LLC_MAX 0x5F
59#define FDDI_FC_K_SYNC_LLC_MIN 0xD0
60#define FDDI_FC_K_SYNC_LLC_MAX 0xD7
61#define FDDI_FC_K_IMPLEMENTOR_MIN 0x60
62#define FDDI_FC_K_IMPLEMENTOR_MAX 0x6F
63#define FDDI_FC_K_RESERVED_MIN 0x70
64#define FDDI_FC_K_RESERVED_MAX 0x7F
65
66/* Define LLC and SNAP constants */
67#define FDDI_EXTENDED_SAP 0xAA
68#define FDDI_UI_CMD 0x03
69
70/* Define 802.2 Type 1 header */
71struct fddi_8022_1_hdr {
72 __u8 dsap; /* destination service access point */
73 __u8 ssap; /* source service access point */
74 __u8 ctrl; /* control byte #1 */
75} __attribute__((packed));
76
77/* Define 802.2 Type 2 header */
78struct fddi_8022_2_hdr {
79 __u8 dsap; /* destination service access point */
80 __u8 ssap; /* source service access point */
81 __u8 ctrl_1; /* control byte #1 */
82 __u8 ctrl_2; /* control byte #2 */
83} __attribute__((packed));
84
85/* Define 802.2 SNAP header */
86struct fddi_snap_hdr {
87 __u8 dsap; /* always 0xAA */
88 __u8 ssap; /* always 0xAA */
89 __u8 ctrl; /* always 0x03 */
90 __u8 oui[FDDI_K_OUI_LEN]; /* organizational universal id */
91 __be16 ethertype; /* packet type ID field */
92} __attribute__((packed));
93
94/* Define FDDI LLC frame header */
95struct fddihdr {
96 __u8 fc; /* frame control */
97 __u8 daddr[FDDI_K_ALEN]; /* destination address */
98 __u8 saddr[FDDI_K_ALEN]; /* source address */
99 union {
100 struct fddi_8022_1_hdr llc_8022_1;
101 struct fddi_8022_2_hdr llc_8022_2;
102 struct fddi_snap_hdr llc_snap;
103 } hdr;
104} __attribute__((packed));
105
106
107#endif /* _UAPI_LINUX_IF_FDDI_H */