tcpdump/fddi.h
guy fcc82f451d The "__attribute__((packed))" tag on structures causes some files not to
compile with Sun C, as "interface.h" isn't being included before the
structures are being declared.

Furthermore, in the files that Sun C *can* compile, it doesn't cause Sun
C to generate code that's safe with unaligned accesses, as
"__attribute__" is defined as a do-nothing macro with compilers that
don't support it.

Therefore, we get rid of that tag on the structures to which it was
added, and instead use "EXTRACT_16BIT()" and "EXTRACT_32BIT()" to fetch
16-bit and 32-bit big-endian quantities from packets.  We also fix some
other references to multi-byte quantities to get rid of code that tries
to do unaligned loads on platforms that don't support them.

We also throw in a hack that makes those macros use
"__attribute__((packed))" on structures containing only one 16-bit or
32-bit integer to get the compiler to generate unaligned-safe code
rather than doing it by hand.  (GCC on SPARC produces the same code that
doing it by hand does; I don't know if GCC on any other big-endian
strict-alignment processor generates better code for that case.  On
little-endian processors, as "ntohs()" and "ntohl()" might be functions,
that might actually produce worse code.)

Fix some places to use "%u" rather than "%d" to print unsigned
quantities.
2002-12-11 07:13:49 +00:00

77 lines
2.9 KiB
C

/*
* Copyright (c) 1992, 1993, 1994, 1995, 1996
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that: (1) source code distributions
* retain the above copyright notice and this paragraph in its entirety, (2)
* distributions including binary code include the above copyright notice and
* this paragraph in its entirety in the documentation or other materials
* provided with the distribution, and (3) all advertising materials mentioning
* features or use of this software display the following acknowledgement:
* ``This product includes software developed by the University of California,
* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
* the University nor the names of its contributors may be used to endorse
* or promote products derived from this software without specific prior
* written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*
* @(#) $Header: /tcpdump/master/tcpdump/fddi.h,v 1.11 2002-12-11 07:13:51 guy Exp $ (LBL)
*/
/*
* Based on Ultrix if_fddi.h
*/
/*
* This stuff should come from a system header file, but there's no
* obviously portable way to do that and it's not really going
* to change from system to system (except for the padding business).
*/
struct fddi_header {
u_char fddi_fc; /* frame control */
u_char fddi_dhost[6];
u_char fddi_shost[6];
};
/*
* Length of an FDDI header; note that some compilers may pad
* "struct fddi_header" to a multiple of 4 bytes, for example, so
* "sizeof (struct fddi_header)" may not give the right
* answer.
*/
#define FDDI_HDRLEN 13
/* Useful values for fddi_fc (frame control) field */
/*
* FDDI Frame Control bits
*/
#define FDDIFC_C 0x80 /* Class bit */
#define FDDIFC_L 0x40 /* Address length bit */
#define FDDIFC_F 0x30 /* Frame format bits */
#define FDDIFC_Z 0x0f /* Control bits */
/*
* FDDI Frame Control values. (48-bit addressing only).
*/
#define FDDIFC_VOID 0x40 /* Void frame */
#define FDDIFC_NRT 0x80 /* Nonrestricted token */
#define FDDIFC_RT 0xc0 /* Restricted token */
#define FDDIFC_SMT_INFO 0x41 /* SMT Info */
#define FDDIFC_SMT_NSA 0x4F /* SMT Next station adrs */
#define FDDIFC_MAC_BEACON 0xc2 /* MAC Beacon frame */
#define FDDIFC_MAC_CLAIM 0xc3 /* MAC Claim frame */
#define FDDIFC_LLC_ASYNC 0x50 /* Async. LLC frame */
#define FDDIFC_LLC_SYNC 0xd0 /* Sync. LLC frame */
#define FDDIFC_IMP_ASYNC 0x60 /* Implementor Async. */
#define FDDIFC_IMP_SYNC 0xe0 /* Implementor Synch. */
#define FDDIFC_SMT 0x40 /* SMT frame */
#define FDDIFC_MAC 0xc0 /* MAC frame */
#define FDDIFC_CLFF 0xF0 /* Class/Length/Format bits */
#define FDDIFC_ZZZZ 0x0F /* Control bits */