366 lines
11 KiB
C
366 lines
11 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 1.22 1999/10/12 06:20:05 gram Exp $
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*
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* Ethereal - Network traffic analyzer
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* By Gerald Combs <gerald@zing.org>
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* Copyright 1998 Gerald Combs
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*
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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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#ifdef HAVE_SYS_TYPES_H
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# include <sys/types.h>
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#endif
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#include <stdio.h>
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#include <glib.h>
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#include "packet.h"
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#include "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_dst = -1;
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static int hf_fddi_src = -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 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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/* "swaptab[i]" is the value of "i" with the bits reversed. */
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static u_char swaptab[256] = {
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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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static void
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swap_mac_addr(u_char *swapped_addr, const u_char *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] = swaptab[orig_addr[i]];
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}
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}
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void
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capture_fddi(const u_char *pd, guint32 cap_len, packet_counts *ld) {
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int offset = 0, fc;
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if (cap_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, cap_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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void dissect_fddi(const u_char *pd, frame_data *fd, proto_tree *tree,
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gboolean bitswapped)
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{
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int offset = 0, fc;
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proto_tree *fh_tree;
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proto_item *ti;
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gchar *fc_str;
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u_char src[6], dst[6];
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u_char src_swapped[6], dst_swapped[6];
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if (fd->cap_len < FDDI_HEADER_SIZE) {
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dissect_data(pd, offset, fd, tree);
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return;
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}
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/* Extract the source and destination addresses, possibly bit-swapping
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them. */
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if (bitswapped) {
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swap_mac_addr(dst, (u_char *)&pd[FDDI_P_DHOST]);
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swap_mac_addr(src, (u_char *)&pd[FDDI_P_SHOST]);
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} else {
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memcpy(dst, (u_char *)&pd[FDDI_P_DHOST], sizeof dst);
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memcpy(src, (u_char *)&pd[FDDI_P_SHOST], sizeof src);
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}
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fc = (int) pd[FDDI_P_FC];
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fc_str = fddifc_to_str(fc);
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if (check_col(fd, COL_RES_DL_SRC))
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col_add_str(fd, COL_RES_DL_SRC, get_ether_name(src));
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if (check_col(fd, COL_RES_DL_DST))
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col_add_str(fd, COL_RES_DL_DST, get_ether_name(dst));
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if (check_col(fd, COL_UNRES_DL_SRC))
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col_add_str(fd, COL_UNRES_DL_SRC, ether_to_str(src));
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if (check_col(fd, COL_UNRES_DL_DST))
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col_add_str(fd, COL_UNRES_DL_DST, ether_to_str(dst));
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if (check_col(fd, COL_PROTOCOL))
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col_add_str(fd, COL_PROTOCOL, "FDDI");
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if (check_col(fd, COL_INFO))
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col_add_str(fd, COL_INFO, fc_str);
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offset = FDDI_HEADER_SIZE;
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if (tree) {
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ti = proto_tree_add_item_format(tree, proto_fddi, 0, offset, NULL,
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"Fiber Distributed Data Interface, %s", fc_str);
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swap_mac_addr(dst_swapped, (u_char*)&pd[FDDI_P_DHOST]);
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swap_mac_addr(src_swapped, (u_char*)&pd[FDDI_P_SHOST]);
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fh_tree = proto_item_add_subtree(ti, ETT_FDDI);
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proto_tree_add_item(fh_tree, hf_fddi_fc, FDDI_P_FC, 1, fc);
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proto_tree_add_item(fh_tree, hf_fddi_dst, FDDI_P_DHOST, 6, dst);
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proto_tree_add_item(fh_tree, hf_fddi_src, 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_item_hidden(fh_tree, hf_fddi_dst, FDDI_P_DHOST, 6, dst_swapped);
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proto_tree_add_item_hidden(fh_tree, hf_fddi_dst, FDDI_P_SHOST, 6, src_swapped);
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}
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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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dissect_llc(pd, offset, fd, tree);
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return;
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default :
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dissect_data(pd, offset, fd, tree);
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return;
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} /* fc */
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} /* dissect_fddi */
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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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"" }},
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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" }},
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{ &hf_fddi_src,
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{ "Source", "fddi.src", FT_ETHER, BASE_NONE, NULL, 0x0,
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"" }},
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};
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proto_fddi = proto_register_protocol ("Fiber Distributed Data Interface", "fddi" );
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proto_register_field_array(proto_fddi, hf, array_length(hf));
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}
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