forked from osmocom/wireshark
![Guy Harris](/assets/img/avatar_default.png)
qualifiers as necessary to ensure that we don't have to. "strcmp()", "strcasecmp()", and "memcmp()" don't return booleans; don't test their results as if they did. Use "guint8", not "guchar", for a pointer to (one or more) 8-bit bytes. Update Michael Tuexen's e-mail address. svn path=/trunk/; revision=6726
466 lines
13 KiB
C
466 lines
13 KiB
C
/* packet-fddi.c
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* Routines for FDDI packet disassembly
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*
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* Laurent Deniel <deniel@worldnet.fr>
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*
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* $Id: packet-fddi.c,v 1.59 2002/12/02 23:43:26 guy Exp $
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*
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* Ethereal - Network traffic analyzer
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* By Gerald Combs <gerald@ethereal.com>
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* Copyright 1998 Gerald Combs
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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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 <stdio.h>
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#include <string.h>
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#include <glib.h>
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#include <epan/bitswap.h>
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#include <epan/packet.h>
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#include "packet-fddi.h"
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#include "packet-llc.h"
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#include <epan/resolv.h>
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static int proto_fddi = -1;
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static int hf_fddi_fc = -1;
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static int hf_fddi_fc_clf = -1;
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static int hf_fddi_fc_prio = -1;
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static int hf_fddi_fc_smt_subtype = -1;
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static int hf_fddi_fc_mac_subtype = -1;
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static int hf_fddi_dst = -1;
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static int hf_fddi_src = -1;
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static int hf_fddi_addr = -1;
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static gint ett_fddi = -1;
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static gint ett_fddi_fc = -1;
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/* FDDI Frame Control values */
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#define FDDI_FC_VOID 0x00 /* Void frame */
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#define FDDI_FC_NRT 0x80 /* Nonrestricted token */
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#define FDDI_FC_RT 0xc0 /* Restricted token */
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#define FDDI_FC_MAC 0xc0 /* MAC frame */
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#define FDDI_FC_SMT 0x40 /* SMT frame */
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#define FDDI_FC_SMT_INFO 0x41 /* SMT Info */
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#define FDDI_FC_SMT_NSA 0x4F /* SMT Next station adrs */
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#define FDDI_FC_SMT_MIN FDDI_FC_SMT_INFO
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#define FDDI_FC_SMT_MAX FDDI_FC_SMT_NSA
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#define FDDI_FC_MAC_MIN 0xc1
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#define FDDI_FC_MAC_BEACON 0xc2 /* MAC Beacon frame */
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#define FDDI_FC_MAC_CLAIM 0xc3 /* MAC Claim frame */
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#define FDDI_FC_MAC_MAX 0xcf
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#define FDDI_FC_LLC_ASYNC 0x50 /* Async. LLC frame */
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#define FDDI_FC_LLC_ASYNC_MIN FDDI_FC_LLC_ASYNC
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#define FDDI_FC_LLC_ASYNC_DEF 0x54
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#define FDDI_FC_LLC_ASYNC_MAX 0x5f
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#define FDDI_FC_LLC_SYNC 0xd0 /* Sync. LLC frame */
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#define FDDI_FC_LLC_SYNC_MIN FDDI_FC_LLC_SYNC
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#define FDDI_FC_LLC_SYNC_MAX 0xd7
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#define FDDI_FC_IMP_ASYNC 0x60 /* Implementor Async. */
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#define FDDI_FC_IMP_ASYNC_MIN FDDI_FC_IMP_ASYNC
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#define FDDI_FC_IMP_ASYNC_MAX 0x6f
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#define FDDI_FC_IMP_SYNC 0xe0 /* Implementor Synch. */
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#define FDDI_FC_CLFF 0xF0 /* Class/Length/Format bits */
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#define FDDI_FC_ZZZZ 0x0F /* Control bits */
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/*
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* Async frame ZZZZ bits:
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*/
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#define FDDI_FC_ASYNC_R 0x08 /* Reserved */
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#define FDDI_FC_ASYNC_PRI 0x07 /* Priority */
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#define CLFF_BITS(fc) (((fc) & FDDI_FC_CLFF) >> 4)
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#define ZZZZ_BITS(fc) ((fc) & FDDI_FC_ZZZZ)
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static const value_string clf_vals[] = {
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{ CLFF_BITS(FDDI_FC_VOID), "Void" },
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{ CLFF_BITS(FDDI_FC_SMT), "SMT" },
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{ CLFF_BITS(FDDI_FC_LLC_ASYNC), "Async LLC" },
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{ CLFF_BITS(FDDI_FC_IMP_ASYNC), "Implementor Async" },
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{ CLFF_BITS(FDDI_FC_NRT), "Nonrestricted Token" },
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{ CLFF_BITS(FDDI_FC_MAC), "MAC" },
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{ CLFF_BITS(FDDI_FC_LLC_SYNC), "Sync LLC" },
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{ CLFF_BITS(FDDI_FC_IMP_SYNC), "Implementor Sync" },
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{ 0, NULL }
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};
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static const value_string smt_subtype_vals[] = {
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{ ZZZZ_BITS(FDDI_FC_SMT_INFO), "Info" },
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{ ZZZZ_BITS(FDDI_FC_SMT_NSA), "Next Station Address" },
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{ 0, NULL }
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};
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static const value_string mac_subtype_vals[] = {
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{ ZZZZ_BITS(FDDI_FC_MAC_BEACON), "Beacon" },
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{ ZZZZ_BITS(FDDI_FC_MAC_CLAIM), "Claim" },
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{ 0, NULL }
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};
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#define FDDI_HEADER_SIZE 13
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/* field positions */
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#define FDDI_P_FC 0
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#define FDDI_P_DHOST 1
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#define FDDI_P_SHOST 7
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static dissector_handle_t llc_handle;
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static dissector_handle_t data_handle;
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static void
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swap_mac_addr(guint8 *swapped_addr, const guint8 *orig_addr)
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{
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int i;
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for (i = 0; i < 6; i++) {
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swapped_addr[i] = BIT_SWAP(orig_addr[i]);
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}
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}
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void
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capture_fddi(const guchar *pd, int len, packet_counts *ld)
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{
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int offset = 0, fc;
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if (!BYTES_ARE_IN_FRAME(0, len, FDDI_HEADER_SIZE)) {
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ld->other++;
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return;
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}
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offset = FDDI_HEADER_SIZE;
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fc = (int) pd[FDDI_P_FC];
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switch (fc) {
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/* From now, only 802.2 SNAP (Async. LCC frame) is supported */
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case FDDI_FC_LLC_ASYNC + 0 :
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case FDDI_FC_LLC_ASYNC + 1 :
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case FDDI_FC_LLC_ASYNC + 2 :
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case FDDI_FC_LLC_ASYNC + 3 :
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case FDDI_FC_LLC_ASYNC + 4 :
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case FDDI_FC_LLC_ASYNC + 5 :
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case FDDI_FC_LLC_ASYNC + 6 :
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case FDDI_FC_LLC_ASYNC + 7 :
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case FDDI_FC_LLC_ASYNC + 8 :
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case FDDI_FC_LLC_ASYNC + 9 :
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case FDDI_FC_LLC_ASYNC + 10 :
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case FDDI_FC_LLC_ASYNC + 11 :
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case FDDI_FC_LLC_ASYNC + 12 :
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case FDDI_FC_LLC_ASYNC + 13 :
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case FDDI_FC_LLC_ASYNC + 14 :
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case FDDI_FC_LLC_ASYNC + 15 :
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capture_llc(pd, offset, len, ld);
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return;
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default :
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ld->other++;
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return;
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} /* fc */
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} /* capture_fddi */
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static gchar *
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fddifc_to_str(int fc)
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{
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static gchar strbuf[128+1];
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switch (fc) {
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case FDDI_FC_VOID: /* Void frame */
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return "Void frame";
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case FDDI_FC_NRT: /* Nonrestricted token */
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return "Nonrestricted token";
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case FDDI_FC_RT: /* Restricted token */
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return "Restricted token";
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case FDDI_FC_SMT_INFO: /* SMT Info */
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return "SMT info";
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case FDDI_FC_SMT_NSA: /* SMT Next station adrs */
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return "SMT Next station address";
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case FDDI_FC_MAC_BEACON: /* MAC Beacon frame */
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return "MAC beacon";
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case FDDI_FC_MAC_CLAIM: /* MAC Claim frame */
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return "MAC claim token";
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default:
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switch (fc & FDDI_FC_CLFF) {
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case FDDI_FC_MAC:
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sprintf(strbuf, "MAC frame, control %x", fc & FDDI_FC_ZZZZ);
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return strbuf;
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case FDDI_FC_SMT:
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sprintf(strbuf, "SMT frame, control %x", fc & FDDI_FC_ZZZZ);
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return strbuf;
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case FDDI_FC_LLC_ASYNC:
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if (fc & FDDI_FC_ASYNC_R)
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sprintf(strbuf, "Async LLC frame, control %x", fc & FDDI_FC_ZZZZ);
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else
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sprintf(strbuf, "Async LLC frame, priority %d",
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fc & FDDI_FC_ASYNC_PRI);
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return strbuf;
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case FDDI_FC_LLC_SYNC:
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if (fc & FDDI_FC_ZZZZ) {
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sprintf(strbuf, "Sync LLC frame, control %x", fc & FDDI_FC_ZZZZ);
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return strbuf;
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} else
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return "Sync LLC frame";
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case FDDI_FC_IMP_ASYNC:
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sprintf(strbuf, "Implementor async frame, control %x",
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fc & FDDI_FC_ZZZZ);
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return strbuf;
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case FDDI_FC_IMP_SYNC:
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sprintf(strbuf, "Implementor sync frame, control %x",
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fc & FDDI_FC_ZZZZ);
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return strbuf;
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break;
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default:
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return "Unknown frame type";
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}
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}
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}
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static void
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dissect_fddi(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
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gboolean bitswapped)
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{
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int fc;
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proto_tree *fh_tree = NULL;
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proto_item *ti;
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gchar *fc_str;
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proto_tree *fc_tree;
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static guchar src[6], dst[6];
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guchar src_swapped[6], dst_swapped[6];
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tvbuff_t *next_tvb;
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if (check_col(pinfo->cinfo, COL_PROTOCOL))
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "FDDI");
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fc = (int) tvb_get_guint8(tvb, FDDI_P_FC);
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fc_str = fddifc_to_str(fc);
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if (check_col(pinfo->cinfo, COL_INFO))
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col_add_str(pinfo->cinfo, COL_INFO, fc_str);
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if (tree) {
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ti = proto_tree_add_protocol_format(tree, proto_fddi, tvb, 0, FDDI_HEADER_SIZE,
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"Fiber Distributed Data Interface, %s", fc_str);
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fh_tree = proto_item_add_subtree(ti, ett_fddi);
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ti = proto_tree_add_uint_format(fh_tree, hf_fddi_fc, tvb, FDDI_P_FC, 1, fc,
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"Frame Control: 0x%02x (%s)", fc, fc_str);
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fc_tree = proto_item_add_subtree(ti, ett_fddi_fc);
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proto_tree_add_uint(fc_tree, hf_fddi_fc_clf, tvb, FDDI_P_FC, 1, fc);
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switch (fc & FDDI_FC_CLFF) {
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case FDDI_FC_SMT:
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proto_tree_add_uint(fc_tree, hf_fddi_fc_smt_subtype, tvb, FDDI_P_FC, 1, fc);
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break;
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case FDDI_FC_MAC:
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if (fc != FDDI_FC_RT)
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proto_tree_add_uint(fc_tree, hf_fddi_fc_mac_subtype, tvb, FDDI_P_FC, 1, fc);
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break;
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case FDDI_FC_LLC_ASYNC:
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if (!(fc & FDDI_FC_ASYNC_R))
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proto_tree_add_uint(fc_tree, hf_fddi_fc_prio, tvb, FDDI_P_FC, 1, fc);
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break;
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}
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}
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/* Extract the destination address, possibly bit-swapping it. */
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if (bitswapped)
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swap_mac_addr(dst, tvb_get_ptr(tvb, FDDI_P_DHOST, 6));
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else
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memcpy(dst, tvb_get_ptr(tvb, FDDI_P_DHOST, 6), sizeof dst);
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swap_mac_addr(dst_swapped, tvb_get_ptr(tvb, FDDI_P_DHOST, 6));
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/* XXX - copy them to some buffer associated with "pi", rather than
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just making "dst" static? */
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SET_ADDRESS(&pinfo->dl_dst, AT_ETHER, 6, &dst[0]);
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SET_ADDRESS(&pinfo->dst, AT_ETHER, 6, &dst[0]);
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if (fh_tree) {
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proto_tree_add_ether(fh_tree, hf_fddi_dst, tvb, FDDI_P_DHOST, 6, dst);
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proto_tree_add_ether_hidden(fh_tree, hf_fddi_addr, tvb, FDDI_P_DHOST, 6, dst);
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/* hide some bit-swapped mac address fields in the proto_tree, just in case */
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proto_tree_add_ether_hidden(fh_tree, hf_fddi_dst, tvb, FDDI_P_DHOST, 6, dst_swapped);
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proto_tree_add_ether_hidden(fh_tree, hf_fddi_addr, tvb, FDDI_P_DHOST, 6, dst_swapped);
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}
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/* Extract the source address, possibly bit-swapping it. */
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if (bitswapped)
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swap_mac_addr(src, tvb_get_ptr(tvb, FDDI_P_SHOST, 6));
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else
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memcpy(src, tvb_get_ptr(tvb, FDDI_P_SHOST, 6), sizeof src);
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swap_mac_addr(src_swapped, tvb_get_ptr(tvb, FDDI_P_SHOST, 6));
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/* XXX - copy them to some buffer associated with "pi", rather than
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just making "src" static? */
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SET_ADDRESS(&pinfo->dl_src, AT_ETHER, 6, &src[0]);
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SET_ADDRESS(&pinfo->src, AT_ETHER, 6, &src[0]);
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if (fh_tree) {
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proto_tree_add_ether(fh_tree, hf_fddi_src, tvb, FDDI_P_SHOST, 6, src);
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proto_tree_add_ether_hidden(fh_tree, hf_fddi_addr, tvb, FDDI_P_SHOST, 6, src);
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/* hide some bit-swapped mac address fields in the proto_tree, just in case */
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proto_tree_add_ether_hidden(fh_tree, hf_fddi_src, tvb, FDDI_P_SHOST, 6, src_swapped);
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proto_tree_add_ether_hidden(fh_tree, hf_fddi_addr, tvb, FDDI_P_SHOST, 6, src_swapped);
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}
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next_tvb = tvb_new_subset(tvb, FDDI_HEADER_SIZE, -1, -1);
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switch (fc) {
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/* From now, only 802.2 SNAP (Async. LCC frame) is supported */
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case FDDI_FC_LLC_ASYNC + 0 :
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case FDDI_FC_LLC_ASYNC + 1 :
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case FDDI_FC_LLC_ASYNC + 2 :
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case FDDI_FC_LLC_ASYNC + 3 :
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case FDDI_FC_LLC_ASYNC + 4 :
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case FDDI_FC_LLC_ASYNC + 5 :
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case FDDI_FC_LLC_ASYNC + 6 :
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case FDDI_FC_LLC_ASYNC + 7 :
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case FDDI_FC_LLC_ASYNC + 8 :
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case FDDI_FC_LLC_ASYNC + 9 :
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case FDDI_FC_LLC_ASYNC + 10 :
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case FDDI_FC_LLC_ASYNC + 11 :
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case FDDI_FC_LLC_ASYNC + 12 :
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case FDDI_FC_LLC_ASYNC + 13 :
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case FDDI_FC_LLC_ASYNC + 14 :
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case FDDI_FC_LLC_ASYNC + 15 :
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call_dissector(llc_handle, next_tvb, pinfo, tree);
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return;
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default :
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call_dissector(data_handle,next_tvb, pinfo, tree);
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return;
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} /* fc */
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} /* dissect_fddi */
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static void
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dissect_fddi_bitswapped(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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dissect_fddi(tvb, pinfo, tree, TRUE);
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}
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static void
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dissect_fddi_not_bitswapped(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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dissect_fddi(tvb, pinfo, tree, FALSE);
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}
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void
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proto_register_fddi(void)
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{
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static hf_register_info hf[] = {
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/*
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* XXX - we want this guy to have his own private formatting
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* routine, using "fc_to_str()"; if "fc_to_str()" returns
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* NULL, just show the hex value, else show the string.
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*/
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{ &hf_fddi_fc,
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{ "Frame Control", "fddi.fc", FT_UINT8, BASE_HEX, NULL, 0x0,
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"", HFILL }},
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{ &hf_fddi_fc_clf,
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{ "Class/Length/Format", "fddi.fc.clf", FT_UINT8, BASE_HEX, VALS(clf_vals), FDDI_FC_CLFF,
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"", HFILL }},
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{ &hf_fddi_fc_prio,
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{ "Priority", "fddi.fc.prio", FT_UINT8, BASE_DEC, NULL, FDDI_FC_ASYNC_PRI,
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"", HFILL }},
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{ &hf_fddi_fc_smt_subtype,
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{ "SMT Subtype", "fddi.fc.smt_subtype", FT_UINT8, BASE_DEC, VALS(smt_subtype_vals), FDDI_FC_ZZZZ,
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"", HFILL }},
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{ &hf_fddi_fc_mac_subtype,
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{ "MAC Subtype", "fddi.fc.mac_subtype", FT_UINT8, BASE_DEC, VALS(mac_subtype_vals), FDDI_FC_ZZZZ,
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"", HFILL }},
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{ &hf_fddi_dst,
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{ "Destination", "fddi.dst", FT_ETHER, BASE_NONE, NULL, 0x0,
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"Destination Hardware Address", HFILL }},
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{ &hf_fddi_src,
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{ "Source", "fddi.src", FT_ETHER, BASE_NONE, NULL, 0x0,
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"", HFILL }},
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{ &hf_fddi_addr,
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{ "Source or Destination Address", "fddi.addr", FT_ETHER, BASE_NONE, NULL, 0x0,
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"Source or Destination Hardware Address", HFILL }},
|
|
|
|
};
|
|
static gint *ett[] = {
|
|
&ett_fddi,
|
|
&ett_fddi_fc,
|
|
};
|
|
|
|
proto_fddi = proto_register_protocol("Fiber Distributed Data Interface",
|
|
"FDDI", "fddi");
|
|
proto_register_field_array(proto_fddi, hf, array_length(hf));
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
|
|
/*
|
|
* Called from various dissectors for encapsulated FDDI frames.
|
|
* We assume the MAC addresses in them aren't bitswapped.
|
|
*/
|
|
register_dissector("fddi", dissect_fddi_not_bitswapped, proto_fddi);
|
|
}
|
|
|
|
void
|
|
proto_reg_handoff_fddi(void)
|
|
{
|
|
dissector_handle_t fddi_handle, fddi_bitswapped_handle;
|
|
|
|
/*
|
|
* Get a handle for the LLC dissector.
|
|
*/
|
|
llc_handle = find_dissector("llc");
|
|
data_handle = find_dissector("data");
|
|
|
|
fddi_handle = find_dissector("fddi");
|
|
dissector_add("wtap_encap", WTAP_ENCAP_FDDI, fddi_handle);
|
|
fddi_bitswapped_handle =
|
|
create_dissector_handle(dissect_fddi_bitswapped, proto_fddi);
|
|
dissector_add("wtap_encap", WTAP_ENCAP_FDDI_BITSWAPPED,
|
|
fddi_bitswapped_handle);
|
|
}
|