![Bill Meier](/assets/img/avatar_default.png)
Also: whiule we're at it: - fix hf[] blurbs as appropriate to use NULL; - fix some indentation svn path=/trunk/; revision=27890
428 lines
16 KiB
C
428 lines
16 KiB
C
/* packet-mtp2.c
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* Routines for MTP2 dissection
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* It is hopefully (needs testing) compliant to
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* ITU-T Q.703 and Q.703 Annex A.
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*
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* Copyright 2001, 2004 Michael Tuexen <tuexen [AT] fh-muenster.de>
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*
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* $Id$
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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* Copied from packet-m2pa.c
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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 <glib.h>
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#include <epan/packet.h>
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#include "epan/prefs.h"
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#include "epan/crc16.h"
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#include "epan/expert.h"
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#define LITTLE_ENDIAN_BYTE_ORDER TRUE
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/* Initialize the protocol and registered fields */
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static int proto_mtp2 = -1;
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static int hf_mtp2_bsn = -1;
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static int hf_mtp2_ext_bsn = -1;
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static int hf_mtp2_ext_res = -1;
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static int hf_mtp2_bib = -1;
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static int hf_mtp2_ext_bib = -1;
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static int hf_mtp2_fsn = -1;
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static int hf_mtp2_ext_fsn = -1;
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static int hf_mtp2_fib = -1;
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static int hf_mtp2_ext_fib = -1;
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static int hf_mtp2_li = -1;
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static int hf_mtp2_ext_li = -1;
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static int hf_mtp2_spare = -1;
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static int hf_mtp2_ext_spare = -1;
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static int hf_mtp2_sf = -1;
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static int hf_mtp2_sf_extra = -1;
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/* Initialize the subtree pointers */
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static gint ett_mtp2 = -1;
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static dissector_handle_t mtp3_handle;
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static gboolean use_extended_sequence_numbers_default = FALSE;
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static gboolean use_extended_sequence_numbers = FALSE;
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#define BSN_BIB_LENGTH 1
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#define FSN_FIB_LENGTH 1
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#define LI_LENGTH 1
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#define HEADER_LENGTH (BSN_BIB_LENGTH + FSN_FIB_LENGTH + LI_LENGTH)
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#define EXTENDED_BSN_BIB_LENGTH 2
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#define EXTENDED_FSN_FIB_LENGTH 2
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#define EXTENDED_LI_LENGTH 2
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#define EXTENDED_HEADER_LENGTH (EXTENDED_BSN_BIB_LENGTH + EXTENDED_FSN_FIB_LENGTH + EXTENDED_LI_LENGTH)
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#define BSN_BIB_OFFSET 0
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#define FSN_FIB_OFFSET (BSN_BIB_OFFSET + BSN_BIB_LENGTH)
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#define LI_OFFSET (FSN_FIB_OFFSET + FSN_FIB_LENGTH)
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#define SIO_OFFSET (LI_OFFSET + LI_LENGTH)
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#define EXTENDED_BSN_BIB_OFFSET 0
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#define EXTENDED_FSN_FIB_OFFSET (EXTENDED_BSN_BIB_OFFSET + EXTENDED_BSN_BIB_LENGTH)
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#define EXTENDED_LI_OFFSET (EXTENDED_FSN_FIB_OFFSET + EXTENDED_FSN_FIB_LENGTH)
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#define EXTENDED_SIO_OFFSET (EXTENDED_LI_OFFSET + EXTENDED_LI_LENGTH)
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#define BSN_MASK 0x7f
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#define BIB_MASK 0x80
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#define FSN_MASK 0x7f
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#define FIB_MASK 0x80
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#define LI_MASK 0x3f
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#define SPARE_MASK 0xc0
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#define EXTENDED_BSN_MASK 0x0fff
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#define EXTENDED_RES_MASK 0x7000
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#define EXTENDED_BIB_MASK 0x8000
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#define EXTENDED_FSN_MASK 0x0fff
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#define EXTENDED_FIB_MASK 0x8000
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#define EXTENDED_LI_MASK 0x01ff
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#define EXTENDED_SPARE_MASK 0xfe00
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static void
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dissect_mtp2_header(tvbuff_t *su_tvb, proto_item *mtp2_tree)
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{
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if (mtp2_tree) {
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if (use_extended_sequence_numbers) {
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proto_tree_add_item(mtp2_tree, hf_mtp2_ext_bsn, su_tvb, EXTENDED_BSN_BIB_OFFSET, EXTENDED_BSN_BIB_LENGTH, LITTLE_ENDIAN_BYTE_ORDER);
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proto_tree_add_item(mtp2_tree, hf_mtp2_ext_res, su_tvb, EXTENDED_BSN_BIB_OFFSET, EXTENDED_BSN_BIB_LENGTH, LITTLE_ENDIAN_BYTE_ORDER);
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proto_tree_add_item(mtp2_tree, hf_mtp2_ext_bib, su_tvb, EXTENDED_BSN_BIB_OFFSET, EXTENDED_BSN_BIB_LENGTH, LITTLE_ENDIAN_BYTE_ORDER);
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proto_tree_add_item(mtp2_tree, hf_mtp2_ext_fsn, su_tvb, EXTENDED_FSN_FIB_OFFSET, EXTENDED_FSN_FIB_LENGTH, LITTLE_ENDIAN_BYTE_ORDER);
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proto_tree_add_item(mtp2_tree, hf_mtp2_ext_res, su_tvb, EXTENDED_BSN_BIB_OFFSET, EXTENDED_BSN_BIB_LENGTH, LITTLE_ENDIAN_BYTE_ORDER);
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proto_tree_add_item(mtp2_tree, hf_mtp2_ext_fib, su_tvb, EXTENDED_FSN_FIB_OFFSET, EXTENDED_FSN_FIB_LENGTH, LITTLE_ENDIAN_BYTE_ORDER);
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proto_tree_add_item(mtp2_tree, hf_mtp2_ext_li, su_tvb, EXTENDED_LI_OFFSET, EXTENDED_LI_LENGTH, LITTLE_ENDIAN_BYTE_ORDER);
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proto_tree_add_item(mtp2_tree, hf_mtp2_ext_spare, su_tvb, EXTENDED_LI_OFFSET, EXTENDED_LI_LENGTH, LITTLE_ENDIAN_BYTE_ORDER);
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} else {
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proto_tree_add_item(mtp2_tree, hf_mtp2_bsn, su_tvb, BSN_BIB_OFFSET, BSN_BIB_LENGTH, LITTLE_ENDIAN_BYTE_ORDER);
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proto_tree_add_item(mtp2_tree, hf_mtp2_bib, su_tvb, BSN_BIB_OFFSET, BSN_BIB_LENGTH, LITTLE_ENDIAN_BYTE_ORDER);
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proto_tree_add_item(mtp2_tree, hf_mtp2_fsn, su_tvb, FSN_FIB_OFFSET, FSN_FIB_LENGTH, LITTLE_ENDIAN_BYTE_ORDER);
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proto_tree_add_item(mtp2_tree, hf_mtp2_fib, su_tvb, FSN_FIB_OFFSET, FSN_FIB_LENGTH, LITTLE_ENDIAN_BYTE_ORDER);
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proto_tree_add_item(mtp2_tree, hf_mtp2_li, su_tvb, LI_OFFSET, LI_LENGTH, LITTLE_ENDIAN_BYTE_ORDER);
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proto_tree_add_item(mtp2_tree, hf_mtp2_spare, su_tvb, LI_OFFSET, LI_LENGTH, LITTLE_ENDIAN_BYTE_ORDER);
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}
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}
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}
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/*
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*******************************************************************************
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* DETAILS : Calculate a new FCS-16 given the current FCS-16 and the new data.
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*******************************************************************************
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*/
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static guint16
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mtp2_fcs16(tvbuff_t * tvbuff)
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{
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guint len = tvb_length(tvbuff)-2;
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/* Check for Invalid Length */
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if (len == 0)
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return (0x0000);
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return crc16_ccitt_tvb(tvbuff, len);
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}
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/*
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* This function for CRC16 only is based on the decode_fcs of packet_ppp.c
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*/
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static tvbuff_t *
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mtp2_decode_crc16(tvbuff_t *tvb, proto_tree *fh_tree, packet_info *pinfo)
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{
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tvbuff_t *next_tvb;
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gint len, reported_len;
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int rx_fcs_offset;
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guint32 rx_fcs_exp;
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guint32 rx_fcs_got;
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int proto_offset=0;
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proto_item *cause;
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/*
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* Do we have the entire packet, and does it include a 2-byte FCS?
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*/
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len = tvb_length_remaining(tvb, proto_offset);
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reported_len = tvb_reported_length_remaining(tvb, proto_offset);
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if (reported_len < 2 || len < 0) {
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/*
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* The packet is claimed not to even have enough data for a 2-byte FCS,
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* or we're already past the end of the captured data.
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* Don't slice anything off.
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*/
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next_tvb = tvb_new_subset(tvb, proto_offset, -1, -1);
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} else if (len < reported_len) {
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/*
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* The packet is claimed to have enough data for a 2-byte FCS, but
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* we didn't capture all of the packet.
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* Slice off the 2-byte FCS from the reported length, and trim the
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* captured length so it's no more than the reported length; that
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* will slice off what of the FCS, if any, is in the captured
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* length.
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*/
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reported_len -= 2;
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if (len > reported_len)
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len = reported_len;
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next_tvb = tvb_new_subset(tvb, proto_offset, len, reported_len);
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} else {
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/*
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* We have the entire packet, and it includes a 2-byte FCS.
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* Slice it off.
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*/
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len -= 2;
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reported_len -= 2;
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next_tvb = tvb_new_subset(tvb, proto_offset, len, reported_len);
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/*
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* Compute the FCS and put it into the tree.
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*/
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rx_fcs_offset = proto_offset + len;
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rx_fcs_exp = mtp2_fcs16(tvb);
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rx_fcs_got = tvb_get_letohs(tvb, rx_fcs_offset);
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if (rx_fcs_got != rx_fcs_exp) {
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cause=proto_tree_add_text(fh_tree, tvb, rx_fcs_offset, 2,
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"FCS 16: 0x%04x [incorrect, should be 0x%04x]",
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rx_fcs_got, rx_fcs_exp);
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proto_item_set_expert_flags(cause, PI_MALFORMED, PI_WARN);
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expert_add_info_format(pinfo, cause, PI_MALFORMED, PI_WARN, "MTP2 Frame CheckFCS 16 Error");
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} else {
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proto_tree_add_text(fh_tree, tvb, rx_fcs_offset, 2,
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"FCS 16: 0x%04x [correct]",
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rx_fcs_got);
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}
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}
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return next_tvb;
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}
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static void
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dissect_mtp2_fisu(packet_info *pinfo)
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{
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if (check_col(pinfo->cinfo, COL_INFO))
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col_set_str(pinfo->cinfo, COL_INFO, "FISU ");
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}
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static const value_string status_field_vals[] = {
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{ 0x0, "Status Indication O" },
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{ 0x1, "Status Indication N" },
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{ 0x2, "Status Indication E" },
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{ 0x3, "Status Indication OS" },
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{ 0x4, "Status Indication PO" },
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{ 0x5, "Status Indication B" },
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{ 0, NULL}
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};
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/* Same as above but in acronym form (for the Info column) */
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static const value_string status_field_acro_vals[] = {
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{ 0x0, "SIO" },
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{ 0x1, "SIN" },
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{ 0x2, "SIE" },
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{ 0x3, "SIOS" },
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{ 0x4, "SIPO" },
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{ 0x5, "SIB" },
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{ 0, NULL}
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};
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#define SF_OFFSET (LI_OFFSET + LI_LENGTH)
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#define EXTENDED_SF_OFFSET (EXTENDED_LI_OFFSET + EXTENDED_LI_LENGTH)
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#define SF_LENGTH 1
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#define SF_EXTRA_OFFSET (SF_OFFSET + SF_LENGTH)
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#define EXTENDED_SF_EXTRA_OFFSET (EXTENDED_SF_OFFSET + SF_LENGTH)
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#define SF_EXTRA_LENGTH 1
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static void
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dissect_mtp2_lssu(tvbuff_t *su_tvb, packet_info *pinfo, proto_item *mtp2_tree)
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{
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guint8 sf = 0xFF;
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guint8 sf_offset, sf_extra_offset;
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if (use_extended_sequence_numbers) {
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sf_offset = EXTENDED_SF_OFFSET;
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sf_extra_offset = EXTENDED_SF_EXTRA_OFFSET;
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} else {
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sf_offset = SF_OFFSET;
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sf_extra_offset = SF_EXTRA_OFFSET;
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}
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proto_tree_add_item(mtp2_tree, hf_mtp2_sf, su_tvb, sf_offset, SF_LENGTH, LITTLE_ENDIAN_BYTE_ORDER);
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sf = tvb_get_guint8(su_tvb, SF_OFFSET);
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/* If the LI is 2 then there is an extra octet following the standard SF
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* field but it is not defined what this octet is.
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* (In any case the first byte of the SF always has the same meaning.)
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*/
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if ((tvb_get_guint8(su_tvb, LI_OFFSET) & LI_MASK) == 2)
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proto_tree_add_item(mtp2_tree, hf_mtp2_sf_extra, su_tvb, sf_extra_offset, SF_EXTRA_LENGTH, LITTLE_ENDIAN_BYTE_ORDER);
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if (check_col(pinfo->cinfo, COL_INFO))
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col_set_str(pinfo->cinfo, COL_INFO, val_to_str(sf, status_field_acro_vals, "Unknown"));
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}
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static void
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dissect_mtp2_msu(tvbuff_t *su_tvb, packet_info *pinfo, proto_item *mtp2_item, proto_item *tree)
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{
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gint sif_sio_length;
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tvbuff_t *sif_sio_tvb;
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if (check_col(pinfo->cinfo, COL_INFO))
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col_set_str(pinfo->cinfo, COL_INFO, "MSU ");
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if (use_extended_sequence_numbers) {
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sif_sio_length = tvb_length(su_tvb) - EXTENDED_HEADER_LENGTH;
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sif_sio_tvb = tvb_new_subset(su_tvb, EXTENDED_SIO_OFFSET, sif_sio_length, sif_sio_length);
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} else {
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sif_sio_length = tvb_length(su_tvb) - HEADER_LENGTH;
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sif_sio_tvb = tvb_new_subset(su_tvb, SIO_OFFSET, sif_sio_length, sif_sio_length);
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}
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call_dissector(mtp3_handle, sif_sio_tvb, pinfo, tree);
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if (tree) {
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if (use_extended_sequence_numbers)
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proto_item_set_len(mtp2_item, EXTENDED_HEADER_LENGTH);
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else
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proto_item_set_len(mtp2_item, HEADER_LENGTH);
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}
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}
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static void
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dissect_mtp2_su(tvbuff_t *su_tvb, packet_info *pinfo, proto_item *mtp2_item, proto_item *mtp2_tree, proto_tree *tree,gboolean validate_crc)
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{
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guint16 li;
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tvbuff_t *next_tvb = NULL;
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dissect_mtp2_header(su_tvb, mtp2_tree);
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if (validate_crc)
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next_tvb = mtp2_decode_crc16(su_tvb, mtp2_tree, pinfo);
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if (use_extended_sequence_numbers)
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li = tvb_get_letohs(su_tvb, EXTENDED_LI_OFFSET) & EXTENDED_LI_MASK;
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else
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li = tvb_get_guint8(su_tvb, LI_OFFSET) & LI_MASK;
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switch(li) {
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case 0:
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dissect_mtp2_fisu(pinfo);
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break;
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case 1:
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case 2:
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if (validate_crc)
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dissect_mtp2_lssu(next_tvb, pinfo, mtp2_tree);
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else
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dissect_mtp2_lssu(su_tvb, pinfo, mtp2_tree);
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break;
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default:
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/* In some capture files (like .rf5), CRC are not present */
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/* So, to avoid trouble, give the complete buffer if CRC validation is disabled */
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if (validate_crc)
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dissect_mtp2_msu(next_tvb, pinfo, mtp2_item, tree);
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else
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dissect_mtp2_msu(su_tvb, pinfo, mtp2_item, tree);
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break;
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}
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}
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static void
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dissect_mtp2_common(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, gboolean validate_crc)
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{
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proto_item *mtp2_item = NULL;
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proto_tree *mtp2_tree = NULL;
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if (pinfo->annex_a_used == MTP2_ANNEX_A_USED_UNKNOWN)
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use_extended_sequence_numbers = use_extended_sequence_numbers_default;
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else
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use_extended_sequence_numbers = (pinfo->annex_a_used == MTP2_ANNEX_A_USED);
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if (check_col(pinfo->cinfo, COL_PROTOCOL))
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "MTP2");
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if (tree) {
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mtp2_item = proto_tree_add_item(tree, proto_mtp2, tvb, 0, -1, FALSE);
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mtp2_tree = proto_item_add_subtree(mtp2_item, ett_mtp2);
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};
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dissect_mtp2_su(tvb, pinfo, mtp2_item, mtp2_tree, tree, validate_crc);
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}
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/* Dissect MTP2 frame with/without CRC16 included at end of payload */
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static void
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dissect_mtp2(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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/* If the link extention indicate the FCS presence, then the Checkbits
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* have to be proceeded in the MTP2 dissector */
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if ( pinfo->fd->lnk_t == WTAP_ENCAP_ERF ) {
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dissect_mtp2_common(tvb, pinfo, tree, TRUE);
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} else {
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dissect_mtp2_common(tvb, pinfo, tree, FALSE);
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}
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}
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void
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proto_register_mtp2(void)
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{
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static hf_register_info hf[] = {
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{ &hf_mtp2_bsn, { "Backward sequence number", "mtp2.bsn", FT_UINT8, BASE_DEC, NULL, BSN_MASK, NULL, HFILL } },
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{ &hf_mtp2_ext_bsn, { "Backward sequence number", "mtp2.bsn", FT_UINT16, BASE_DEC, NULL, EXTENDED_BSN_MASK, NULL, HFILL } },
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{ &hf_mtp2_ext_res, { "Reserved", "mtp2.res", FT_UINT16, BASE_DEC, NULL, EXTENDED_RES_MASK, NULL, HFILL } },
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{ &hf_mtp2_bib, { "Backward indicator bit", "mtp2.bib", FT_UINT8, BASE_DEC, NULL, BIB_MASK, NULL, HFILL } },
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{ &hf_mtp2_ext_bib, { "Backward indicator bit", "mtp2.bib", FT_UINT16, BASE_DEC, NULL, EXTENDED_BIB_MASK, NULL, HFILL } },
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{ &hf_mtp2_fsn, { "Forward sequence number", "mtp2.fsn", FT_UINT8, BASE_DEC, NULL, FSN_MASK, NULL, HFILL } },
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{ &hf_mtp2_ext_fsn, { "Forward sequence number", "mtp2.fsn", FT_UINT16, BASE_DEC, NULL, EXTENDED_FSN_MASK, NULL, HFILL } },
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|
{ &hf_mtp2_fib, { "Forward indicator bit", "mtp2.fib", FT_UINT8, BASE_DEC, NULL, FIB_MASK, NULL, HFILL } },
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|
{ &hf_mtp2_ext_fib, { "Forward indicator bit", "mtp2.fib", FT_UINT16, BASE_DEC, NULL, EXTENDED_FIB_MASK, NULL, HFILL } },
|
|
{ &hf_mtp2_li, { "Length Indicator", "mtp2.li", FT_UINT8, BASE_DEC, NULL, LI_MASK, NULL, HFILL } },
|
|
{ &hf_mtp2_ext_li, { "Length Indicator", "mtp2.li", FT_UINT16, BASE_DEC, NULL, EXTENDED_LI_MASK, NULL, HFILL } },
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|
{ &hf_mtp2_spare, { "Spare", "mtp2.spare", FT_UINT8, BASE_DEC, NULL, SPARE_MASK, NULL, HFILL } },
|
|
{ &hf_mtp2_ext_spare, { "Spare", "mtp2.spare", FT_UINT16, BASE_DEC, NULL, EXTENDED_SPARE_MASK, NULL, HFILL } },
|
|
{ &hf_mtp2_sf, { "Status field", "mtp2.sf", FT_UINT8, BASE_DEC, VALS(status_field_vals), 0x0, NULL, HFILL } },
|
|
{ &hf_mtp2_sf_extra, { "Status field extra octet", "mtp2.sf_extra", FT_UINT8, BASE_HEX, NULL, 0x0, NULL, HFILL } }
|
|
};
|
|
|
|
static gint *ett[] = {
|
|
&ett_mtp2
|
|
};
|
|
|
|
module_t *mtp2_module;
|
|
|
|
proto_mtp2 = proto_register_protocol("Message Transfer Part Level 2", "MTP2", "mtp2");
|
|
register_dissector("mtp2", dissect_mtp2, proto_mtp2);
|
|
|
|
proto_register_field_array(proto_mtp2, hf, array_length(hf));
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
|
|
mtp2_module = prefs_register_protocol(proto_mtp2, NULL);
|
|
prefs_register_bool_preference(mtp2_module,
|
|
"use_extended_sequence_numbers",
|
|
"Use extended sequence numbers",
|
|
"Whether the MTP2 dissector should use extended sequence numbers as described in Q.703, Annex A as a default.",
|
|
&use_extended_sequence_numbers_default);
|
|
|
|
|
|
}
|
|
|
|
void
|
|
proto_reg_handoff_mtp2(void)
|
|
{
|
|
dissector_handle_t mtp2_handle;
|
|
|
|
mtp2_handle = find_dissector("mtp2");
|
|
dissector_add("wtap_encap", WTAP_ENCAP_MTP2, mtp2_handle);
|
|
dissector_add("wtap_encap", WTAP_ENCAP_MTP2_WITH_PHDR, mtp2_handle);
|
|
|
|
mtp3_handle = find_dissector("mtp3");
|
|
}
|