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tcpdump/token.h

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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 15:13:49 +08:00
/* @(#) $Header: /tcpdump/master/tcpdump/token.h,v 1.6 2002-12-11 07:14:12 guy Exp $ (LBL) */
Add a token-ring link-layer dissector, made by merging the FreeBSD and NetBSD ones; use it for DLT_IEEE802, which in many OSes is used for token ring.
2000-07-25 13:28:11 +08:00
/*
* Copyright (c) 1998, Larry Lile
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice unmodified, this list of conditions, and the following
* disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*/
#define TOKEN_HDRLEN 14
#define TOKEN_RING_MAC_LEN 6
#define ROUTING_SEGMENT_MAX 16
#define IS_SOURCE_ROUTED(trp) ((trp)->token_shost[0] & 0x80)
#define FRAME_TYPE(trp) (((trp)->token_fc & 0xC0) >> 6)
#define TOKEN_FC_LLC 1
#define BROADCAST(trp) ((ntohs((trp)->token_rcf) & 0xE000) >> 13)
#define RIF_LENGTH(trp) ((ntohs((trp)->token_rcf) & 0x1f00) >> 8)
#define DIRECTION(trp) ((ntohs((trp)->token_rcf) & 0x0080) >> 7)
#define LARGEST_FRAME(trp) ((ntohs((trp)->token_rcf) & 0x0070) >> 4)
#define RING_NUMBER(trp, x) ((ntohs((trp)->token_rseg[x]) & 0xfff0) >> 4)
#define BRIDGE_NUMBER(trp, x) ((ntohs((trp)->token_rseg[x]) & 0x000f))
Add a few more GCC warnings on GCC >= 2 for ".devel" builds. From Neil T. Spring: fixes for many of those warnings: addrtoname.c, configure.in: Linux needs netinet/ether.h for ether_ntohost print-*.c: change char *foo = "bar" to const char *foo = "bar" to appease -Wwrite-strings; should affect no run-time behavior. print-*.c: make some variables unsigned. print-bgp.c: plen ('prefix len') is unsigned, no reason to validate by comparing to zero. print-cnfp.c, print-rx.c: use intoa, provided by addrtoname, instead of inet_ntoa. print-domain.c: unsigned int l; (l=foo()) < 0 is guaranteed to be false, so check for (u_int)-1, which represents failure, explicitly. print-isakmp.c: complete initialization of attrmap objects. print-lwres.c: "if(x); print foo;" seemed much more likely to be intended to be "if(x) { print foo; }". print-smb.c: complete initialization of some structures. In addition, add some fixes for the signed vs. unsigned comparison warnings: extract.h: cast the result of the byte-extraction-and-combining, as, at least for the 16-bit version, C's integral promotions will turn "u_int16_t" into "int" if there are other "int"s nearby. print-*.c: make some more variables unsigned, or add casts to an unsigned type of signed values known not to be negative, or add casts to "int" of unsigned values known to fit in an "int", and make other changes needed to handle the aforementioned variables now being unsigned. print-isakmp.c: clean up the handling of error/status indicators in notify messages. print-ppp.c: get rid of a check that an unsigned quantity is >= 0. print-radius.c: clean up some of the bounds checking. print-smb.c: extract the word count into a "u_int" to avoid the aforementioned problems with C's integral promotions. print-snmp.c: change a check that an unsigned variable is >= 0 to a check that it's != 0. Also, fix some formats to use "%u" rather than "%d" for unsigned quantities.
2002-09-05 08:00:07 +08:00
#define SEGMENT_COUNT(trp) ((int)((RIF_LENGTH(trp) - 2) / 2))
Add a token-ring link-layer dissector, made by merging the FreeBSD and NetBSD ones; use it for DLT_IEEE802, which in many OSes is used for token ring.
2000-07-25 13:28:11 +08:00
struct token_header {
always use u_intXX_t for protocol format declaration. char/short/int may not come with exact size. while at it, correct signedness of ip/udp header field. nuke most of the use of bitfield. TODO: bitfield in namser.h
2000-10-03 10:54:54 +08:00
u_int8_t token_ac;
u_int8_t token_fc;
u_int8_t token_dhost[TOKEN_RING_MAC_LEN];
u_int8_t token_shost[TOKEN_RING_MAC_LEN];
u_int16_t token_rcf;
u_int16_t token_rseg[ROUTING_SEGMENT_MAX];
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 15:13:49 +08:00
};
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