352 lines
11 KiB
C
352 lines
11 KiB
C
/*
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* Copyright (c) 1991, 1992, 1993, 1994, 1995, 1996, 1997
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that: (1) source code distributions
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* retain the above copyright notice and this paragraph in its entirety, (2)
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* distributions including binary code include the above copyright notice and
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* this paragraph in its entirety in the documentation or other materials
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* provided with the distribution, and (3) all advertising materials mentioning
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* features or use of this software display the following acknowledgement:
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* ``This product includes software developed by the University of California,
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* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
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* the University nor the names of its contributors may be used to endorse
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* or promote products derived from this software without specific prior
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* written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*
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* $FreeBSD$
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*/
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#define NETDISSECT_REWORKED
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <tcpdump-stdinc.h>
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#include <string.h>
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#include "interface.h"
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#include "addrtoname.h"
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#include "ether.h"
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/*
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* Based on Ultrix if_fddi.h
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*/
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struct fddi_header {
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u_char fddi_fc; /* frame control */
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u_char fddi_dhost[6];
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u_char fddi_shost[6];
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};
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/*
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* Length of an FDDI header; note that some compilers may pad
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* "struct fddi_header" to a multiple of 4 bytes, for example, so
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* "sizeof (struct fddi_header)" may not give the right
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* answer.
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*/
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#define FDDI_HDRLEN 13
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/* Useful values for fddi_fc (frame control) field */
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/*
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* FDDI Frame Control bits
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*/
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#define FDDIFC_C 0x80 /* Class bit */
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#define FDDIFC_L 0x40 /* Address length bit */
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#define FDDIFC_F 0x30 /* Frame format bits */
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#define FDDIFC_Z 0x0f /* Control bits */
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/*
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* FDDI Frame Control values. (48-bit addressing only).
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*/
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#define FDDIFC_VOID 0x40 /* Void frame */
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#define FDDIFC_NRT 0x80 /* Nonrestricted token */
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#define FDDIFC_RT 0xc0 /* Restricted token */
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#define FDDIFC_SMT_INFO 0x41 /* SMT Info */
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#define FDDIFC_SMT_NSA 0x4F /* SMT Next station adrs */
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#define FDDIFC_MAC_BEACON 0xc2 /* MAC Beacon frame */
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#define FDDIFC_MAC_CLAIM 0xc3 /* MAC Claim frame */
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#define FDDIFC_LLC_ASYNC 0x50 /* Async. LLC frame */
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#define FDDIFC_LLC_SYNC 0xd0 /* Sync. LLC frame */
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#define FDDIFC_IMP_ASYNC 0x60 /* Implementor Async. */
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#define FDDIFC_IMP_SYNC 0xe0 /* Implementor Synch. */
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#define FDDIFC_SMT 0x40 /* SMT frame */
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#define FDDIFC_MAC 0xc0 /* MAC frame */
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#define FDDIFC_CLFF 0xF0 /* Class/Length/Format bits */
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#define FDDIFC_ZZZZ 0x0F /* Control bits */
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/*
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* Some FDDI interfaces use bit-swapped addresses.
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*/
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#if defined(ultrix) || defined(__alpha) || defined(__bsdi) || defined(__NetBSD__) || defined(__linux__)
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int fddi_bitswap = 0;
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#else
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int fddi_bitswap = 1;
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#endif
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/*
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* FDDI support for tcpdump, by Jeffrey Mogul [DECWRL], June 1992
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*
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* Based in part on code by Van Jacobson, which bears this note:
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*
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* NOTE: This is a very preliminary hack for FDDI support.
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* There are all sorts of wired in constants & nothing (yet)
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* to print SMT packets as anything other than hex dumps.
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* Most of the necessary changes are waiting on my redoing
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* the "header" that a kernel fddi driver supplies to bpf: I
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* want it to look like one byte of 'direction' (0 or 1
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* depending on whether the packet was inbound or outbound),
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* two bytes of system/driver dependent data (anything an
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* implementor thinks would be useful to filter on and/or
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* save per-packet, then the real 21-byte FDDI header.
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* Steve McCanne & I have also talked about adding the
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* 'direction' byte to all bpf headers (e.g., in the two
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* bytes of padding on an ethernet header). It's not clear
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* we could do this in a backwards compatible way & we hate
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* the idea of an incompatible bpf change. Discussions are
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* proceeding.
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*
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* Also, to really support FDDI (and better support 802.2
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* over ethernet) we really need to re-think the rather simple
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* minded assumptions about fixed length & fixed format link
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* level headers made in gencode.c. One day...
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*
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* - vj
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*/
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static const u_char fddi_bit_swap[] = {
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0x00, 0x80, 0x40, 0xc0, 0x20, 0xa0, 0x60, 0xe0,
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0x10, 0x90, 0x50, 0xd0, 0x30, 0xb0, 0x70, 0xf0,
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0x08, 0x88, 0x48, 0xc8, 0x28, 0xa8, 0x68, 0xe8,
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0x18, 0x98, 0x58, 0xd8, 0x38, 0xb8, 0x78, 0xf8,
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0x04, 0x84, 0x44, 0xc4, 0x24, 0xa4, 0x64, 0xe4,
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0x14, 0x94, 0x54, 0xd4, 0x34, 0xb4, 0x74, 0xf4,
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0x0c, 0x8c, 0x4c, 0xcc, 0x2c, 0xac, 0x6c, 0xec,
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0x1c, 0x9c, 0x5c, 0xdc, 0x3c, 0xbc, 0x7c, 0xfc,
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0x02, 0x82, 0x42, 0xc2, 0x22, 0xa2, 0x62, 0xe2,
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0x12, 0x92, 0x52, 0xd2, 0x32, 0xb2, 0x72, 0xf2,
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0x0a, 0x8a, 0x4a, 0xca, 0x2a, 0xaa, 0x6a, 0xea,
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0x1a, 0x9a, 0x5a, 0xda, 0x3a, 0xba, 0x7a, 0xfa,
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0x06, 0x86, 0x46, 0xc6, 0x26, 0xa6, 0x66, 0xe6,
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0x16, 0x96, 0x56, 0xd6, 0x36, 0xb6, 0x76, 0xf6,
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0x0e, 0x8e, 0x4e, 0xce, 0x2e, 0xae, 0x6e, 0xee,
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0x1e, 0x9e, 0x5e, 0xde, 0x3e, 0xbe, 0x7e, 0xfe,
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0x01, 0x81, 0x41, 0xc1, 0x21, 0xa1, 0x61, 0xe1,
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0x11, 0x91, 0x51, 0xd1, 0x31, 0xb1, 0x71, 0xf1,
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0x09, 0x89, 0x49, 0xc9, 0x29, 0xa9, 0x69, 0xe9,
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0x19, 0x99, 0x59, 0xd9, 0x39, 0xb9, 0x79, 0xf9,
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0x05, 0x85, 0x45, 0xc5, 0x25, 0xa5, 0x65, 0xe5,
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0x15, 0x95, 0x55, 0xd5, 0x35, 0xb5, 0x75, 0xf5,
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0x0d, 0x8d, 0x4d, 0xcd, 0x2d, 0xad, 0x6d, 0xed,
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0x1d, 0x9d, 0x5d, 0xdd, 0x3d, 0xbd, 0x7d, 0xfd,
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0x03, 0x83, 0x43, 0xc3, 0x23, 0xa3, 0x63, 0xe3,
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0x13, 0x93, 0x53, 0xd3, 0x33, 0xb3, 0x73, 0xf3,
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0x0b, 0x8b, 0x4b, 0xcb, 0x2b, 0xab, 0x6b, 0xeb,
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0x1b, 0x9b, 0x5b, 0xdb, 0x3b, 0xbb, 0x7b, 0xfb,
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0x07, 0x87, 0x47, 0xc7, 0x27, 0xa7, 0x67, 0xe7,
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0x17, 0x97, 0x57, 0xd7, 0x37, 0xb7, 0x77, 0xf7,
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0x0f, 0x8f, 0x4f, 0xcf, 0x2f, 0xaf, 0x6f, 0xef,
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0x1f, 0x9f, 0x5f, 0xdf, 0x3f, 0xbf, 0x7f, 0xff,
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};
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/*
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* Print FDDI frame-control bits
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*/
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static inline void
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print_fddi_fc(netdissect_options *ndo, u_char fc)
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{
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switch (fc) {
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case FDDIFC_VOID: /* Void frame */
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ND_PRINT((ndo, "void "));
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break;
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case FDDIFC_NRT: /* Nonrestricted token */
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ND_PRINT((ndo, "nrt "));
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break;
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case FDDIFC_RT: /* Restricted token */
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ND_PRINT((ndo, "rt "));
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break;
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case FDDIFC_SMT_INFO: /* SMT Info */
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ND_PRINT((ndo, "info "));
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break;
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case FDDIFC_SMT_NSA: /* SMT Next station adrs */
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ND_PRINT((ndo, "nsa "));
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break;
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case FDDIFC_MAC_BEACON: /* MAC Beacon frame */
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ND_PRINT((ndo, "beacon "));
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break;
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case FDDIFC_MAC_CLAIM: /* MAC Claim frame */
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ND_PRINT((ndo, "claim "));
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break;
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default:
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switch (fc & FDDIFC_CLFF) {
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case FDDIFC_MAC:
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ND_PRINT((ndo, "mac%1x ", fc & FDDIFC_ZZZZ));
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break;
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case FDDIFC_SMT:
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ND_PRINT((ndo, "smt%1x ", fc & FDDIFC_ZZZZ));
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break;
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case FDDIFC_LLC_ASYNC:
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ND_PRINT((ndo, "async%1x ", fc & FDDIFC_ZZZZ));
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break;
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case FDDIFC_LLC_SYNC:
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ND_PRINT((ndo, "sync%1x ", fc & FDDIFC_ZZZZ));
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break;
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case FDDIFC_IMP_ASYNC:
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ND_PRINT((ndo, "imp_async%1x ", fc & FDDIFC_ZZZZ));
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break;
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case FDDIFC_IMP_SYNC:
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ND_PRINT((ndo, "imp_sync%1x ", fc & FDDIFC_ZZZZ));
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break;
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default:
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ND_PRINT((ndo, "%02x ", fc));
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break;
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}
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}
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}
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/* Extract src, dst addresses */
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static inline void
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extract_fddi_addrs(const struct fddi_header *fddip, char *fsrc, char *fdst)
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{
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register int i;
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if (fddi_bitswap) {
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/*
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* bit-swap the fddi addresses (isn't the IEEE standards
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* process wonderful!) then convert them to names.
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*/
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for (i = 0; i < 6; ++i)
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fdst[i] = fddi_bit_swap[fddip->fddi_dhost[i]];
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for (i = 0; i < 6; ++i)
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fsrc[i] = fddi_bit_swap[fddip->fddi_shost[i]];
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}
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else {
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memcpy(fdst, (const char *)fddip->fddi_dhost, 6);
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memcpy(fsrc, (const char *)fddip->fddi_shost, 6);
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}
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}
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/*
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* Print the FDDI MAC header
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*/
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static inline void
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fddi_hdr_print(netdissect_options *ndo,
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register const struct fddi_header *fddip, register u_int length,
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register const u_char *fsrc, register const u_char *fdst)
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{
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const char *srcname, *dstname;
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srcname = etheraddr_string(ndo, fsrc);
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dstname = etheraddr_string(ndo, fdst);
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if (ndo->ndo_vflag)
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ND_PRINT((ndo, "%02x %s %s %d: ",
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fddip->fddi_fc,
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srcname, dstname,
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length));
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else if (ndo->ndo_qflag)
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ND_PRINT((ndo, "%s %s %d: ", srcname, dstname, length));
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else {
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print_fddi_fc(ndo, fddip->fddi_fc);
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ND_PRINT((ndo, "%s %s %d: ", srcname, dstname, length));
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}
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}
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static inline void
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fddi_smt_print(netdissect_options *ndo, const u_char *p _U_, u_int length _U_)
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{
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ND_PRINT((ndo, "<SMT printer not yet implemented>"));
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}
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void
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fddi_print(netdissect_options *ndo, const u_char *p, u_int length, u_int caplen)
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{
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const struct fddi_header *fddip = (const struct fddi_header *)p;
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struct ether_header ehdr;
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u_short extracted_ethertype;
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if (caplen < FDDI_HDRLEN) {
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ND_PRINT((ndo, "[|fddi]"));
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return;
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}
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/*
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* Get the FDDI addresses into a canonical form
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*/
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extract_fddi_addrs(fddip, (char *)ESRC(&ehdr), (char *)EDST(&ehdr));
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if (ndo->ndo_eflag)
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fddi_hdr_print(ndo, fddip, length, ESRC(&ehdr), EDST(&ehdr));
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/* Skip over FDDI MAC header */
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length -= FDDI_HDRLEN;
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p += FDDI_HDRLEN;
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caplen -= FDDI_HDRLEN;
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/* Frame Control field determines interpretation of packet */
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if ((fddip->fddi_fc & FDDIFC_CLFF) == FDDIFC_LLC_ASYNC) {
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/* Try to print the LLC-layer header & higher layers */
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if (llc_print(ndo, p, length, caplen, ESRC(&ehdr), EDST(&ehdr),
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&extracted_ethertype) == 0) {
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/*
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* Some kinds of LLC packet we cannot
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* handle intelligently
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*/
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if (!ndo->ndo_eflag)
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fddi_hdr_print(ndo, fddip, length + FDDI_HDRLEN,
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ESRC(&ehdr), EDST(&ehdr));
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if (extracted_ethertype) {
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ND_PRINT((ndo, "(LLC %s) ",
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etherproto_string(htons(extracted_ethertype))));
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}
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if (!ndo->ndo_suppress_default_print)
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ND_DEFAULTPRINT(p, caplen);
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}
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} else if ((fddip->fddi_fc & FDDIFC_CLFF) == FDDIFC_SMT)
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fddi_smt_print(ndo, p, caplen);
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else {
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/* Some kinds of FDDI packet we cannot handle intelligently */
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if (!ndo->ndo_eflag)
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fddi_hdr_print(ndo, fddip, length + FDDI_HDRLEN, ESRC(&ehdr),
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EDST(&ehdr));
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if (!ndo->ndo_suppress_default_print)
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ND_DEFAULTPRINT(p, caplen);
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}
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}
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/*
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* This is the top level routine of the printer. 'p' points
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* to the FDDI header of the packet, 'h->ts' is the timestamp,
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* 'h->len' is the length of the packet off the wire, and 'h->caplen'
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* is the number of bytes actually captured.
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*/
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u_int
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fddi_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h, register const u_char *p)
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{
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fddi_print(ndo, p, h->len, h->caplen);
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return (FDDI_HDRLEN);
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}
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