forked from osmocom/wireshark
261 lines
7.3 KiB
C
261 lines
7.3 KiB
C
/* packet-mtp2.c
|
|
* Routines for MTP2 dissection
|
|
* It is hopefully (needs testing) compliant to
|
|
* ITU-T Q.703
|
|
*
|
|
* Copyright 2001, Michael Tuexen <michael.tuexen[AT]icn.siemens.de>
|
|
*
|
|
* $Id: packet-mtp2.c,v 1.4 2002/08/28 21:00:22 jmayer Exp $
|
|
*
|
|
* Ethereal - Network traffic analyzer
|
|
* By Gerald Combs <gerald@ethereal.com>
|
|
* Copyright 1998 Gerald Combs
|
|
*
|
|
* Copied from packet-m2pa.c
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version 2
|
|
* of the License, or (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
|
|
*/
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
# include "config.h"
|
|
#endif
|
|
|
|
#include <glib.h>
|
|
|
|
#include <epan/packet.h>
|
|
|
|
/* Initialize the protocol and registered fields */
|
|
static int proto_mtp2 = -1;
|
|
static int hf_mtp2_bsn = -1;
|
|
static int hf_mtp2_bib = -1;
|
|
static int hf_mtp2_fsn = -1;
|
|
static int hf_mtp2_fib = -1;
|
|
static int hf_mtp2_li = -1;
|
|
static int hf_mtp2_spare = -1;
|
|
static int hf_mtp2_sf = -1;
|
|
static int hf_mtp2_long_sf = -1;
|
|
|
|
/* Initialize the subtree pointers */
|
|
static gint ett_mtp2 = -1;
|
|
|
|
static dissector_handle_t mtp3_handle;
|
|
static int mtp3_proto_id;
|
|
|
|
#define BSN_BIB_LENGTH 1
|
|
#define FSN_FIB_LENGTH 1
|
|
#define LI_LENGTH 1
|
|
#define HEADER_LENGTH (BSN_BIB_LENGTH + FSN_FIB_LENGTH + LI_LENGTH)
|
|
#define SF_LENGTH 1
|
|
#define LONG_SF_LENGTH 2
|
|
|
|
#define BSN_BIB_OFFSET 0
|
|
#define FSN_FIB_OFFSET (BSN_BIB_OFFSET + BSN_BIB_LENGTH)
|
|
#define LI_OFFSET (FSN_FIB_OFFSET + FSN_FIB_LENGTH)
|
|
#define SIO_OFFSET (LI_OFFSET + LI_LENGTH)
|
|
#define SF_OFFSET (LI_OFFSET + LI_LENGTH)
|
|
|
|
#define BSN_MASK 0x7f
|
|
#define BIB_MASK 0x80
|
|
#define FSN_MASK 0x7f
|
|
#define FIB_MASK 0x80
|
|
#define LI_MASK 0x3f
|
|
#define SPARE_MASK 0xc0
|
|
|
|
#define STATUS_O 0x0
|
|
#define STATUS_N 0x1
|
|
#define STATUS_E 0x2
|
|
#define STATUS_OS 0x3
|
|
#define STATUS_PO 0x4
|
|
#define STATUS_B 0x5
|
|
|
|
static const value_string status_field_vals[] = {
|
|
{ STATUS_O, "Status Indication O" },
|
|
{ STATUS_N, "Status Indication N" },
|
|
{ STATUS_E, "Status Indication E" },
|
|
{ STATUS_OS, "Status Indication OS" },
|
|
{ STATUS_PO, "Status Indication PO" },
|
|
{ STATUS_B, "Status Indication BO" },
|
|
{ 0, NULL}
|
|
};
|
|
|
|
static void
|
|
dissect_mtp2_header(tvbuff_t *su_tvb, proto_item *mtp2_tree)
|
|
{
|
|
guint8 bsn_bib, fsn_fib, li;
|
|
|
|
bsn_bib = tvb_get_guint8(su_tvb, BSN_BIB_OFFSET);
|
|
fsn_fib = tvb_get_guint8(su_tvb, FSN_FIB_OFFSET);
|
|
li = tvb_get_guint8(su_tvb, LI_OFFSET);
|
|
|
|
if (mtp2_tree) {
|
|
proto_tree_add_uint(mtp2_tree, hf_mtp2_bsn, su_tvb, BSN_BIB_OFFSET, BSN_BIB_LENGTH, bsn_bib);
|
|
proto_tree_add_uint(mtp2_tree, hf_mtp2_bib, su_tvb, BSN_BIB_OFFSET, BSN_BIB_LENGTH, bsn_bib);
|
|
proto_tree_add_uint(mtp2_tree, hf_mtp2_fsn, su_tvb, FSN_FIB_OFFSET, FSN_FIB_LENGTH, fsn_fib);
|
|
proto_tree_add_uint(mtp2_tree, hf_mtp2_fib, su_tvb, FSN_FIB_OFFSET, FSN_FIB_LENGTH, fsn_fib);
|
|
proto_tree_add_uint(mtp2_tree, hf_mtp2_li, su_tvb, LI_OFFSET, LI_LENGTH, li);
|
|
proto_tree_add_uint(mtp2_tree, hf_mtp2_spare, su_tvb, LI_OFFSET, LI_LENGTH, li);
|
|
}
|
|
}
|
|
|
|
static void
|
|
dissect_mtp2_fisu(packet_info *pinfo)
|
|
{
|
|
if (check_col(pinfo->cinfo, COL_INFO))
|
|
col_append_str(pinfo->cinfo, COL_INFO, "FISU");
|
|
}
|
|
|
|
static void
|
|
dissect_mtp2_lssu(tvbuff_t *su_tvb, packet_info *pinfo, proto_item *mtp2_tree)
|
|
{
|
|
guint8 li, sf;
|
|
guint16 long_sf;
|
|
|
|
if (check_col(pinfo->cinfo, COL_INFO))
|
|
col_append_str(pinfo->cinfo, COL_INFO, "LSSU");
|
|
|
|
if (mtp2_tree) {
|
|
li = tvb_get_guint8(su_tvb, LI_OFFSET);
|
|
if ((li & LI_MASK) == 1) {
|
|
sf = tvb_get_guint8(su_tvb, SF_OFFSET);
|
|
proto_tree_add_uint(mtp2_tree, hf_mtp2_sf, su_tvb, SF_OFFSET, SF_LENGTH, sf);
|
|
} else {
|
|
long_sf = tvb_get_letohs(su_tvb, SF_OFFSET);
|
|
proto_tree_add_uint(mtp2_tree, hf_mtp2_long_sf, su_tvb, SF_OFFSET, LONG_SF_LENGTH, long_sf);
|
|
}
|
|
}
|
|
}
|
|
|
|
static void
|
|
dissect_mtp2_msu(tvbuff_t *su_tvb, packet_info *pinfo, proto_item *mtp2_item, proto_item *tree)
|
|
{
|
|
gint sif_sio_length;
|
|
tvbuff_t *sif_sio_tvb;
|
|
|
|
if ((check_col(pinfo->cinfo, COL_INFO)) && (!proto_is_protocol_enabled(mtp3_proto_id)))
|
|
col_append_str(pinfo->cinfo, COL_INFO, "MSU");
|
|
|
|
sif_sio_length = tvb_length(su_tvb) - HEADER_LENGTH;
|
|
sif_sio_tvb = tvb_new_subset(su_tvb, SIO_OFFSET, sif_sio_length, sif_sio_length);
|
|
call_dissector(mtp3_handle, sif_sio_tvb, pinfo, tree);
|
|
|
|
if (tree)
|
|
proto_item_set_len(mtp2_item, HEADER_LENGTH);
|
|
|
|
}
|
|
|
|
static void
|
|
dissect_mtp2_su(tvbuff_t *su_tvb, packet_info *pinfo, proto_item *mtp2_item, proto_item *mtp2_tree, proto_tree *tree)
|
|
{
|
|
guint8 li;
|
|
|
|
dissect_mtp2_header(su_tvb, mtp2_tree);
|
|
li = tvb_get_guint8(su_tvb, LI_OFFSET);
|
|
switch(li & LI_MASK) {
|
|
case 0:
|
|
dissect_mtp2_fisu(pinfo);
|
|
break;
|
|
case 1:
|
|
case 2:
|
|
dissect_mtp2_lssu(su_tvb, pinfo, mtp2_tree);
|
|
break;
|
|
default:
|
|
dissect_mtp2_msu(su_tvb, pinfo, mtp2_item, tree);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void
|
|
dissect_mtp2(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
|
|
{
|
|
proto_item *mtp2_item = NULL;
|
|
proto_tree *mtp2_tree = NULL;
|
|
|
|
if (check_col(pinfo->cinfo, COL_PROTOCOL))
|
|
col_set_str(pinfo->cinfo, COL_PROTOCOL, "MTP2");
|
|
|
|
if (tree) {
|
|
mtp2_item = proto_tree_add_item(tree, proto_mtp2, tvb, 0, -1, FALSE);
|
|
mtp2_tree = proto_item_add_subtree(mtp2_item, ett_mtp2);
|
|
};
|
|
|
|
dissect_mtp2_su(tvb, pinfo, mtp2_item, mtp2_tree, tree);
|
|
}
|
|
|
|
void
|
|
proto_register_mtp2(void)
|
|
{
|
|
|
|
static hf_register_info hf[] = {
|
|
{ &hf_mtp2_bsn,
|
|
{ "Backward sequence number", "mtp2.bsn",
|
|
FT_UINT8, BASE_DEC, NULL, BSN_MASK,
|
|
"", HFILL }
|
|
},
|
|
{ &hf_mtp2_bib,
|
|
{ "Backward indicator bit", "mtp2.bib",
|
|
FT_UINT8, BASE_DEC, NULL, BIB_MASK,
|
|
"", HFILL }
|
|
},
|
|
{ &hf_mtp2_fsn,
|
|
{ "Forward sequence number", "mtp2.fsn",
|
|
FT_UINT8, BASE_DEC, NULL, FSN_MASK,
|
|
"", HFILL }
|
|
},
|
|
{ &hf_mtp2_fib,
|
|
{ "Forward indicator bit", "mtp2.fib",
|
|
FT_UINT8, BASE_DEC, NULL, FIB_MASK,
|
|
"", HFILL }
|
|
},
|
|
{ &hf_mtp2_li,
|
|
{ "Length Indicator", "mtp2.li",
|
|
FT_UINT8, BASE_DEC, NULL, LI_MASK,
|
|
"", HFILL }
|
|
},
|
|
{ &hf_mtp2_spare,
|
|
{ "Spare", "mtp2.spare",
|
|
FT_UINT8, BASE_DEC, NULL, SPARE_MASK,
|
|
"", HFILL }
|
|
},
|
|
{ &hf_mtp2_sf,
|
|
{ "Status field", "mtp2.sf",
|
|
FT_UINT8, BASE_DEC, VALS(status_field_vals), 0x0,
|
|
"", HFILL }
|
|
},
|
|
{ &hf_mtp2_long_sf,
|
|
{ "Status field", "mtp2.long_sf",
|
|
FT_UINT16, BASE_HEX, NULL, 0x0,
|
|
"", HFILL }
|
|
}
|
|
};
|
|
|
|
static gint *ett[] = {
|
|
&ett_mtp2
|
|
};
|
|
|
|
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));
|
|
|
|
};
|
|
|
|
void
|
|
proto_reg_handoff_mtp2(void)
|
|
{
|
|
mtp3_handle = find_dissector("mtp3");
|
|
mtp3_proto_id = proto_get_id_by_filter_name("mtp3");
|
|
}
|