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wireshark/packet-m2pa.c

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/* packet-m2pa.c
* Routines for MTP2 Peer Adaptation Layer dissection
* It is hopefully (needs testing) compliant to
* http://www.ietf.org/internet-drafts/draft-ietf-sigtran-m2pa-03.txt
*
* Copyright 2001, Jeff Morriss <jeff.morriss[AT]ulticom.com>,
* updated by Michael Tuexen <michael.tuexen[AT]icn.siemens.de>
*
* $Id: packet-m2pa.c,v 1.6 2002/01/21 07:36:37 guy Exp $
*
* Ethereal - Network traffic analyzer
* By Gerald Combs <gerald@ethereal.com>
* Copyright 1998 Gerald Combs
*
* Copied from packet-m3ua.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 <stdio.h>
#include <stdlib.h>
#ifdef HAVE_SYS_TYPES_H
# include <sys/types.h>
#endif
#ifdef HAVE_NETINET_IN_H
# include <netinet/in.h>
#endif
#include <string.h>
#include <glib.h>
#ifdef NEED_SNPRINTF_H
# include "snprintf.h"
#endif
#include <epan/packet.h>
#include "prefs.h"
/* Warning: Neither of these are standardized yet! */
#define SCTP_PORT_M2PA 2904
#define M2PA_PAYLOAD_PROTOCOL_ID 5
#define VERSION_LENGTH 1
#define SPARE_LENGTH 1
#define CLASS_LENGTH 1
#define TYPE_LENGTH 1
#define LENGTH_LENGTH 4
#define COMMON_HEADER_LENGTH (VERSION_LENGTH + SPARE_LENGTH + \
CLASS_LENGTH + TYPE_LENGTH + LENGTH_LENGTH)
#define VERSION_OFFSET 0
#define SPARE_OFFSET (VERSION_OFFSET + VERSION_LENGTH)
#define CLASS_OFFSET (SPARE_OFFSET + SPARE_LENGTH)
#define TYPE_OFFSET (CLASS_OFFSET + CLASS_LENGTH)
#define LENGTH_OFFSET (TYPE_OFFSET + TYPE_LENGTH)
#define COMMON_HEADER_OFFSET VERSION_OFFSET
#define MESSAGE_DATA_OFFSET (COMMON_HEADER_OFFSET + COMMON_HEADER_LENGTH)
#define PROTOCOL_VERSION_RELEASE_1 1
static const value_string m2pa_protocol_version_values[] = {
{ PROTOCOL_VERSION_RELEASE_1, "Release 1" },
{ 0, NULL } };
#define MESSAGE_CLASS_M2PA 0xb
static const value_string m2pa_message_class_values[] = {
{ MESSAGE_CLASS_M2PA, "M2PA" },
{ 0, NULL } };
#define MESSAGE_TYPE_USER_DATA 0x1
#define MESSAGE_TYPE_LINK_STATUS 0x2
#define MESSAGE_TYPE_PROVING_DATA 0x3
static const value_string m2pa_message_type_values[] = {
{ MESSAGE_TYPE_USER_DATA, "User Data" },
{ MESSAGE_TYPE_LINK_STATUS, "Link Status" },
{ MESSAGE_TYPE_PROVING_DATA, "Proving Data" },
{ 0, NULL } };
/* parts of User Data message */
#define LI_OFFSET 0
#define LI_LENGTH 1
#define MTP3_OFFSET (LI_OFFSET + LI_LENGTH)
/* LI is only used for (ITU national) priority in M2PA */
#define LI_SPARE_MASK 0xfc
#define LI_PRIORITY_MASK 0x3
/* parts of Link Status message */
#define STATUS_LENGTH 4
#define STATUS_OFFSET 0
#define STATUS_ALIGNMENT 1
#define STATUS_PROVING_NORMAL 2
#define STATUS_PROVING_EMERGENCY 3
#define STATUS_READY 4
#define STATUS_PROCESSOR_OUTAGE 5
#define STATUS_PROCESSOR_OUTAGE_ENDED 6
#define STATUS_BUSY 7
#define STATUS_BUSY_ENDED 8
static const value_string m2pa_link_status_values[] = {
{ STATUS_ALIGNMENT, "Alignment" },
{ STATUS_PROVING_NORMAL, "Proving Normal" },
{ STATUS_PROVING_EMERGENCY, "Proving Emergency" },
{ STATUS_READY, "Ready" },
{ STATUS_PROCESSOR_OUTAGE, "Processor Outage" },
{ STATUS_PROCESSOR_OUTAGE_ENDED, "Processor Outage Ended" },
{ STATUS_BUSY, "Busy" },
{ STATUS_BUSY_ENDED, "Busy Ended" },
{ 0, NULL } };
/* Initialize the protocol and registered fields */
static int proto_m2pa = -1;
static int hf_m2pa_version = -1;
static int hf_m2pa_spare = -1;
static int hf_m2pa_type = -1;
static int hf_m2pa_class = -1;
static int hf_m2pa_length = -1;
static int hf_m2pa_status = -1;
static int hf_m2pa_li_spare = -1;
static int hf_m2pa_li_prio = -1;
static int hf_m2pa_proving_data = -1;
static int hf_m2pa_unknown_data = -1;
/* Initialize the subtree pointers */
static gint ett_m2pa = -1;
static gint ett_m2pa_li = -1;
static dissector_handle_t mtp3_handle;
static void
dissect_m2pa_user_data_message(tvbuff_t *message_data_tvb, packet_info *pinfo, proto_item *m2pa_item, proto_tree *m2pa_tree, proto_tree *tree)
{
proto_item *m2pa_li_item;
proto_tree *m2pa_li_tree;
tvbuff_t *payload_tvb;
guint8 li;
guint32 payload_length;
payload_length = tvb_length(message_data_tvb) - LI_LENGTH;
if (m2pa_tree) {
li = tvb_get_guint8(message_data_tvb, LI_OFFSET);
m2pa_li_item = proto_tree_add_text(m2pa_tree, message_data_tvb, LI_OFFSET, LI_LENGTH, "Length Indicator");
m2pa_li_tree = proto_item_add_subtree(m2pa_li_item, ett_m2pa_li);
proto_tree_add_uint(m2pa_li_tree, hf_m2pa_li_spare, message_data_tvb, LI_OFFSET, LI_LENGTH, li);
proto_tree_add_uint(m2pa_li_tree, hf_m2pa_li_prio, message_data_tvb, LI_OFFSET, LI_LENGTH, li);
/* Re-adjust length of M2PA item since it will be dissected as MTP3 */
proto_item_set_len(m2pa_item, COMMON_HEADER_LENGTH + LI_LENGTH);
};
payload_tvb = tvb_new_subset(message_data_tvb, MTP3_OFFSET, payload_length, payload_length);
call_dissector(mtp3_handle, payload_tvb, pinfo, tree);
}
static void
dissect_m2pa_link_status_message(tvbuff_t *message_data_tvb, proto_tree *m2pa_tree)
{
guint32 status;
if (m2pa_tree) {
status = tvb_get_ntohl (message_data_tvb, STATUS_OFFSET);
proto_tree_add_uint(m2pa_tree, hf_m2pa_status, message_data_tvb, STATUS_OFFSET, STATUS_LENGTH, status);
};
}
static void
dissect_m2pa_proving_data_message(tvbuff_t *message_data_tvb, proto_tree *m2pa_tree)
{
guint32 message_data_length;
if (m2pa_tree) {
message_data_length = tvb_length(message_data_tvb);
proto_tree_add_item(m2pa_tree, hf_m2pa_proving_data,
message_data_tvb, 0, message_data_length, FALSE);
};
}
static void
dissect_m2pa_unknown_message(tvbuff_t *message_data_tvb, proto_tree *m2pa_tree)
{
guint32 message_data_length;
if (m2pa_tree) {
message_data_length = tvb_length(message_data_tvb);
proto_tree_add_item(m2pa_tree, hf_m2pa_unknown_data,
message_data_tvb, 0, message_data_length, FALSE);
};
}
static void
dissect_m2pa_common_header(tvbuff_t *common_header_tvb, packet_info *pinfo, proto_tree *m2pa_tree)
{
guint8 version, spare, class, type;
guint32 length;
version = tvb_get_guint8(common_header_tvb, VERSION_OFFSET);
spare = tvb_get_guint8(common_header_tvb, SPARE_OFFSET);
class = tvb_get_guint8(common_header_tvb, CLASS_OFFSET);
type = tvb_get_guint8(common_header_tvb, TYPE_OFFSET);
length = tvb_get_ntohl(common_header_tvb, LENGTH_OFFSET);
if (check_col(pinfo->cinfo, COL_INFO)) {
col_append_str(pinfo->cinfo, COL_INFO, val_to_str(type, m2pa_message_type_values, "Invalid"));
col_append_str(pinfo->cinfo, COL_INFO, " ");
};
if (m2pa_tree) {
proto_tree_add_uint(m2pa_tree, hf_m2pa_version, common_header_tvb, VERSION_OFFSET, VERSION_LENGTH, version);
proto_tree_add_uint(m2pa_tree, hf_m2pa_spare, common_header_tvb, SPARE_OFFSET, SPARE_LENGTH, spare);
proto_tree_add_uint(m2pa_tree, hf_m2pa_type, common_header_tvb, TYPE_OFFSET, TYPE_LENGTH, type);
proto_tree_add_uint(m2pa_tree, hf_m2pa_class, common_header_tvb, CLASS_OFFSET, CLASS_LENGTH, class);
proto_tree_add_uint(m2pa_tree, hf_m2pa_length, common_header_tvb, LENGTH_OFFSET, LENGTH_LENGTH, length);
};
}
static void
dissect_m2pa_message_data(tvbuff_t *message_tvb, packet_info *pinfo, proto_item *m2pa_item, proto_tree *m2pa_tree, proto_tree *tree)
{
guint32 message_data_length;
guint8 type;
tvbuff_t *message_data_tvb;
message_data_length = tvb_get_ntohl(message_tvb, LENGTH_OFFSET) - COMMON_HEADER_LENGTH;
message_data_tvb = tvb_new_subset(message_tvb, MESSAGE_DATA_OFFSET, message_data_length, message_data_length);
type = tvb_get_guint8(message_tvb, TYPE_OFFSET);
switch(type) {
case MESSAGE_TYPE_USER_DATA:
dissect_m2pa_user_data_message(message_data_tvb, pinfo, m2pa_item, m2pa_tree, tree);
break;
case MESSAGE_TYPE_LINK_STATUS:
dissect_m2pa_link_status_message(message_data_tvb, m2pa_tree);
break;
case MESSAGE_TYPE_PROVING_DATA:
dissect_m2pa_proving_data_message(message_data_tvb, m2pa_tree);
break;
default:
dissect_m2pa_unknown_message(message_data_tvb, m2pa_tree);
}
}
static void
dissect_m2pa_message(tvbuff_t *message_tvb, packet_info *pinfo, proto_item *m2pa_item, proto_tree *m2pa_tree, proto_tree *tree)
{
tvbuff_t *common_header_tvb;
common_header_tvb = tvb_new_subset(message_tvb, COMMON_HEADER_OFFSET, COMMON_HEADER_LENGTH, COMMON_HEADER_LENGTH);
dissect_m2pa_common_header(common_header_tvb, pinfo, m2pa_tree);
dissect_m2pa_message_data(message_tvb, pinfo, m2pa_item, m2pa_tree, tree);
}
static void
dissect_m2pa(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
proto_item *m2pa_item;
proto_tree *m2pa_tree;
/* make entry in the Protocol column on summary display */
if (check_col(pinfo->cinfo, COL_PROTOCOL))
col_set_str(pinfo->cinfo, COL_PROTOCOL, "M2PA");
/* In the interest of speed, if "tree" is NULL, don't do any work not
necessary to generate protocol tree items. */
if (tree) {
/* create the m2pa protocol tree */
m2pa_item = proto_tree_add_item(tree, proto_m2pa, tvb, 0, -1, FALSE);
m2pa_tree = proto_item_add_subtree(m2pa_item, ett_m2pa);
} else {
m2pa_item = NULL;
m2pa_tree = NULL;
};
/* dissect the message */
dissect_m2pa_message(tvb, pinfo, m2pa_item, m2pa_tree, tree);
}
/* Register the protocol with Ethereal */
void
proto_register_m2pa(void)
{
/* Setup list of header fields */
static hf_register_info hf[] = {
{ &hf_m2pa_version,
{ "Version", "m2pa.version",
FT_UINT8, BASE_DEC, VALS(m2pa_protocol_version_values), 0x0,
"", HFILL}
},
{ &hf_m2pa_spare,
{ "Spare", "m2pa.spare",
FT_UINT8, BASE_HEX, NULL, 0x0,
"", HFILL}
},
{ &hf_m2pa_type,
{ "Message Type", "m2pa.type",
FT_UINT8, BASE_DEC, VALS(m2pa_message_type_values), 0x0,
"", HFILL}
},
{ &hf_m2pa_class,
{ "Message Class", "m2pa.class",
FT_UINT8, BASE_DEC, VALS(m2pa_message_class_values), 0x0,
"", HFILL}
},
{ &hf_m2pa_length,
{ "Message length", "m2pa.length",
FT_UINT32, BASE_DEC, NULL, 0x0,
"", HFILL}
},
{ &hf_m2pa_li_spare,
{ "Spare", "m2pa.li_spare",
FT_UINT8, BASE_HEX, NULL, LI_SPARE_MASK,
"", HFILL}
},
{ &hf_m2pa_li_prio,
{ "Priority", "m2pa.li_priority",
FT_UINT8, BASE_HEX, NULL, LI_PRIORITY_MASK,
"", HFILL}
},
{ &hf_m2pa_status,
{ "Link Status Status", "m2pa.status",
FT_UINT32, BASE_DEC, VALS(m2pa_link_status_values), 0x0,
"", HFILL}
},
{ &hf_m2pa_proving_data,
{ "Proving Data", "m2pa.proving_data",
FT_BYTES, BASE_NONE, NULL, 0x0,
"", HFILL }
},
{ &hf_m2pa_unknown_data,
{ "Unknown Data", "m2pa.unknown_data",
FT_BYTES, BASE_NONE, NULL, 0x0,
"", HFILL }
}
};
/* Setup protocol subtree array */
static gint *ett[] = {
&ett_m2pa,
&ett_m2pa_li
};
/* Register the protocol name and description */
proto_m2pa = proto_register_protocol("MTP2 Peer Adaptation Layer", "M2PA", "m2pa");
/* Required function calls to register the header fields and subtrees used */
proto_register_field_array(proto_m2pa, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
};
void
proto_reg_handoff_m2pa(void)
{
dissector_handle_t m2pa_handle;
/*
* Get a handle for the MTP3 dissector.
*/
mtp3_handle = find_dissector("mtp3");
m2pa_handle = create_dissector_handle(dissect_m2pa, proto_m2pa);
dissector_add("sctp.ppi", M2PA_PAYLOAD_PROTOCOL_ID, m2pa_handle);
dissector_add("sctp.port", SCTP_PORT_M2PA, m2pa_handle);
}
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