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 */
71 struct 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 */
78 struct 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 */
86 struct 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 */
95 struct 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 */
108