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      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 ANSI FDDI interface.
      7  *
      8  * Version:	@(#)if_fddi.h	1.0.2	Sep 29 2004
      9  *
     10  * Author:	Lawrence V. Stefani, <stefani (at) lkg.dec.com>
     11  *
     12  *		if_fddi.h is based on previous if_ether.h and if_tr.h work by
     13  *			Fred N. van Kempen, <waltje (at) uWalt.NL.Mugnet.ORG>
     14  *			Donald Becker, <becker (at) super.org>
     15  *			Alan Cox, <alan (at) redhat.com>
     16  *			Steve Whitehouse, <gw7rrm (at) eeshack3.swan.ac.uk>
     17  *			Peter De Schrijver, <stud11 (at) cc4.kuleuven.ac.be>
     18  *
     19  *		This program is free software; you can redistribute it and/or
     20  *		modify it under the terms of the GNU General Public License
     21  *		as published by the Free Software Foundation; either version
     22  *		2 of the License, or (at your option) any later version.
     23  */
     24 #ifndef _LINUX_IF_FDDI_H
     25 #define _LINUX_IF_FDDI_H
     26 
     27 #include <linux/types.h>
     28 
     29 /*
     30  *  Define max and min legal sizes.  The frame sizes do not include
     31  *  4 byte FCS/CRC (frame check sequence).
     32  */
     33 #define FDDI_K_ALEN			6		/* Octets in one FDDI address */
     34 #define FDDI_K_8022_HLEN	16		/* Total octets in 802.2 header */
     35 #define FDDI_K_SNAP_HLEN	21		/* Total octets in 802.2 SNAP header */
     36 #define FDDI_K_8022_ZLEN	16		/* Min octets in 802.2 frame sans FCS */
     37 #define FDDI_K_SNAP_ZLEN	21		/* Min octets in 802.2 SNAP frame sans FCS */
     38 #define FDDI_K_8022_DLEN	4475	/* Max octets in 802.2 payload */
     39 #define FDDI_K_SNAP_DLEN	4470	/* Max octets in 802.2 SNAP payload */
     40 #define FDDI_K_LLC_ZLEN		13		/* Min octets in LLC frame sans FCS */
     41 #define FDDI_K_LLC_LEN		4491	/* Max octets in LLC frame sans FCS */
     42 
     43 /* Define FDDI Frame Control (FC) Byte values */
     44 #define FDDI_FC_K_VOID					0x00
     45 #define FDDI_FC_K_NON_RESTRICTED_TOKEN	0x80
     46 #define FDDI_FC_K_RESTRICTED_TOKEN		0xC0
     47 #define FDDI_FC_K_SMT_MIN				0x41
     48 #define FDDI_FC_K_SMT_MAX		   		0x4F
     49 #define FDDI_FC_K_MAC_MIN				0xC1
     50 #define FDDI_FC_K_MAC_MAX		  		0xCF
     51 #define FDDI_FC_K_ASYNC_LLC_MIN			0x50
     52 #define FDDI_FC_K_ASYNC_LLC_DEF			0x54
     53 #define FDDI_FC_K_ASYNC_LLC_MAX			0x5F
     54 #define FDDI_FC_K_SYNC_LLC_MIN			0xD0
     55 #define FDDI_FC_K_SYNC_LLC_MAX			0xD7
     56 #define FDDI_FC_K_IMPLEMENTOR_MIN		0x60
     57 #define FDDI_FC_K_IMPLEMENTOR_MAX  		0x6F
     58 #define FDDI_FC_K_RESERVED_MIN			0x70
     59 #define FDDI_FC_K_RESERVED_MAX			0x7F
     60 
     61 /* Define LLC and SNAP constants */
     62 #define FDDI_EXTENDED_SAP	0xAA
     63 #define FDDI_UI_CMD			0x03
     64 
     65 /* Define 802.2 Type 1 header */
     66 struct fddi_8022_1_hdr
     67 	{
     68 	__u8	dsap;					/* destination service access point */
     69 	__u8	ssap;					/* source service access point */
     70 	__u8	ctrl;					/* control byte #1 */
     71 	} __attribute__ ((packed));
     72 
     73 /* Define 802.2 Type 2 header */
     74 struct fddi_8022_2_hdr
     75 	{
     76 	__u8	dsap;					/* destination service access point */
     77 	__u8	ssap;					/* source service access point */
     78 	__u8	ctrl_1;					/* control byte #1 */
     79 	__u8	ctrl_2;					/* control byte #2 */
     80 	} __attribute__ ((packed));
     81 
     82 /* Define 802.2 SNAP header */
     83 #define FDDI_K_OUI_LEN	3
     84 struct fddi_snap_hdr
     85 	{
     86 	__u8	dsap;					/* always 0xAA */
     87 	__u8	ssap;					/* always 0xAA */
     88 	__u8	ctrl;					/* always 0x03 */
     89 	__u8	oui[FDDI_K_OUI_LEN];	/* organizational universal id */
     90 	__be16	ethertype;				/* packet type ID field */
     91 	} __attribute__ ((packed));
     92 
     93 /* Define FDDI LLC frame header */
     94 struct fddihdr
     95 	{
     96 	__u8	fc;						/* frame control */
     97 	__u8	daddr[FDDI_K_ALEN];		/* destination address */
     98 	__u8	saddr[FDDI_K_ALEN];		/* source address */
     99 	union
    100 		{
    101 		struct fddi_8022_1_hdr		llc_8022_1;
    102 		struct fddi_8022_2_hdr		llc_8022_2;
    103 		struct fddi_snap_hdr		llc_snap;
    104 		} hdr;
    105 	} __attribute__ ((packed));
    106 
    107 
    108 #endif	/* _LINUX_IF_FDDI_H */
    109