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      1 /*
      2  * Copyright (c) 1992, 1993, 1994, 1995, 1996
      3  *	The Regents of the University of California.  All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that: (1) source code distributions
      7  * retain the above copyright notice and this paragraph in its entirety, (2)
      8  * distributions including binary code include the above copyright notice and
      9  * this paragraph in its entirety in the documentation or other materials
     10  * provided with the distribution, and (3) all advertising materials mentioning
     11  * features or use of this software display the following acknowledgement:
     12  * ``This product includes software developed by the University of California,
     13  * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
     14  * the University nor the names of its contributors may be used to endorse
     15  * or promote products derived from this software without specific prior
     16  * written permission.
     17  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
     18  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
     19  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
     20  *
     21  * @(#) $Header: /tcpdump/master/tcpdump/fddi.h,v 1.11 2002-12-11 07:13:51 guy Exp $ (LBL)
     22  */
     23 
     24 /*
     25  * Based on Ultrix if_fddi.h
     26  */
     27 
     28 /*
     29  * This stuff should come from a system header file, but there's no
     30  * obviously portable way to do that and it's not really going
     31  * to change from system to system (except for the padding business).
     32  */
     33 
     34 struct fddi_header {
     35 	u_char  fddi_fc;		/* frame control */
     36 	u_char  fddi_dhost[6];
     37 	u_char  fddi_shost[6];
     38 };
     39 
     40 /*
     41  * Length of an FDDI header; note that some compilers may pad
     42  * "struct fddi_header" to a multiple of 4 bytes, for example, so
     43  * "sizeof (struct fddi_header)" may not give the right
     44  * answer.
     45  */
     46 #define FDDI_HDRLEN 13
     47 
     48 /* Useful values for fddi_fc (frame control) field */
     49 
     50 /*
     51  * FDDI Frame Control bits
     52  */
     53 #define	FDDIFC_C		0x80		/* Class bit */
     54 #define	FDDIFC_L		0x40		/* Address length bit */
     55 #define	FDDIFC_F		0x30		/* Frame format bits */
     56 #define	FDDIFC_Z		0x0f		/* Control bits */
     57 
     58 /*
     59  * FDDI Frame Control values. (48-bit addressing only).
     60  */
     61 #define	FDDIFC_VOID		0x40		/* Void frame */
     62 #define	FDDIFC_NRT		0x80		/* Nonrestricted token */
     63 #define	FDDIFC_RT		0xc0		/* Restricted token */
     64 #define	FDDIFC_SMT_INFO		0x41		/* SMT Info */
     65 #define	FDDIFC_SMT_NSA		0x4F		/* SMT Next station adrs */
     66 #define	FDDIFC_MAC_BEACON	0xc2		/* MAC Beacon frame */
     67 #define	FDDIFC_MAC_CLAIM	0xc3		/* MAC Claim frame */
     68 #define	FDDIFC_LLC_ASYNC	0x50		/* Async. LLC frame */
     69 #define	FDDIFC_LLC_SYNC		0xd0		/* Sync. LLC frame */
     70 #define	FDDIFC_IMP_ASYNC	0x60		/* Implementor Async. */
     71 #define	FDDIFC_IMP_SYNC		0xe0		/* Implementor Synch. */
     72 #define FDDIFC_SMT		0x40		/* SMT frame */
     73 #define FDDIFC_MAC		0xc0		/* MAC frame */
     74 
     75 #define	FDDIFC_CLFF		0xF0		/* Class/Length/Format bits */
     76 #define	FDDIFC_ZZZZ		0x0F		/* Control bits */
     77