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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-02.txt
*
* Copyright 2001, Jeff Morriss <jeff.morriss[AT]ulticom.com>
*
* $Id: packet-m2pa.c,v 1.1 2001/06/21 22:25:51 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 "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 MESSAGE_TYPE_LENGTH 2
#define MESSAGE_LENGTH_LENGTH 4
#define COMMON_HEADER_LENGTH (VERSION_LENGTH + SPARE_LENGTH + \
MESSAGE_TYPE_LENGTH + MESSAGE_LENGTH_LENGTH)
#define VERSION_OFFSET 0
#define SPARE_OFFSET (VERSION_OFFSET + VERSION_LENGTH)
#define MESSAGE_TYPE_OFFSET (SPARE_OFFSET + SPARE_LENGTH)
#define MESSAGE_LENGTH_OFFSET (MESSAGE_TYPE_OFFSET + MESSAGE_TYPE_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_TYPE_USER_DATA 0x0601
#define MESSAGE_TYPE_LINK_STATUS 0x0602
static const value_string m2pa_message_type_values[] = {
{ MESSAGE_TYPE_USER_DATA, "User Data" },
{ MESSAGE_TYPE_LINK_STATUS, "Link Status" },
{ 0, NULL } };
/* parts of User Data message */
#define LI_OFFSET 0
#define LI_LENGTH 1
#define USER_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_IS 1
#define STATUS_PO 2
#define STATUS_POE 3
#define STATUS_BUSY 4
#define STATUS_BUSY_E 5
static const value_string m2pa_link_status_values[] = {
{ STATUS_IS, "In Service" },
{ STATUS_PO, "Processor Outage" },
{ STATUS_POE, "Processor Outage Ended" },
{ STATUS_BUSY, "Busy" },
{ STATUS_BUSY_E, "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_message_type = -1;
static int hf_m2pa_message_length = -1;
static int hf_m2pa_ls_status = -1;
static int hf_m2pa_data_li = -1;
static int hf_m2pa_data_li_spare = -1;
static int hf_m2pa_data_li_prio = -1;
/* Initialize the subtree pointers */
static gint ett_m2pa = -1;
static gint ett_m2pa_message_ud = -1;
static gint ett_m2pa_message_ud_li = -1;
static gint ett_m2pa_message_ls = -1;
static dissector_handle_t mtp3_handle;
static void
dissect_m2pa_unknown_message(tvbuff_t *message_tvb, packet_info *pinfo,
proto_tree *m2pa_tree, guint32 message_length,
guint16 message_type)
{
if (check_col(pinfo->fd, COL_INFO)) {
col_set_str(pinfo->fd, COL_INFO,
val_to_str(message_type, m2pa_message_type_values, "Unknown"));
};
if (m2pa_tree) {
proto_tree_add_text(m2pa_tree, message_tvb, 0, message_length,
"Unknown message (%u byte%s)",
message_length, plurality(message_length, "", "s"));
};
}
static void
dissect_m2pa_link_status_message(tvbuff_t *message_tvb, packet_info *pinfo,
proto_tree *m2pa_tree, guint16 message_type)
{
guint32 status;
proto_item *m2pa_ls_item;
proto_tree *m2pa_ls_tree;
status = tvb_get_ntohl (message_tvb, STATUS_OFFSET);
if (check_col(pinfo->fd, COL_INFO)) {
col_set_str(pinfo->fd, COL_INFO,
val_to_str(message_type, m2pa_message_type_values, "unknown"));
col_append_str(pinfo->fd, COL_INFO, " (");
col_append_str(pinfo->fd, COL_INFO,
val_to_str(status, m2pa_link_status_values, "unknown"));
col_append_str(pinfo->fd, COL_INFO, ")");
};
if (m2pa_tree) {
/* create the link status message tree */
m2pa_ls_item = proto_tree_add_text(m2pa_tree, message_tvb, 0,
STATUS_LENGTH,
val_to_str(message_type,
m2pa_message_type_values,
"Unknown"));
m2pa_ls_tree = proto_item_add_subtree(m2pa_ls_item, ett_m2pa_message_ls);
/* add the components of the link status message to the protocol tree */
proto_tree_add_uint(m2pa_ls_tree, hf_m2pa_ls_status,
message_tvb, STATUS_OFFSET,
STATUS_LENGTH, status);
};
}
static void
dissect_m2pa_user_data_message(tvbuff_t *message_tvb, packet_info *pinfo,
proto_item *m2pa_item, proto_tree *m2pa_tree,
guint32 message_length, proto_tree *tree,
guint16 message_type)
{
proto_item *m2pa_ud_item;
proto_tree *m2pa_ud_tree;
proto_item *m2pa_ud_li_item;
proto_tree *m2pa_ud_li_tree;
tvbuff_t *payload_tvb;
guint8 li;
guint32 payload_length;
li = tvb_get_guint8(message_tvb, LI_OFFSET);
payload_length = message_length - LI_LENGTH;
if (m2pa_tree) {
/* create the user data message tree */
m2pa_ud_item = proto_tree_add_item(m2pa_tree, proto_m2pa, message_tvb, 0,
tvb_length(message_tvb), FALSE);
m2pa_ud_tree = proto_item_add_subtree(m2pa_ud_item, ett_m2pa_message_ud);
/* add the components of the user data message to the protocol tree */
/* LI */
m2pa_ud_li_item = proto_tree_add_uint(m2pa_ud_tree, hf_m2pa_data_li,
message_tvb, LI_OFFSET, LI_LENGTH,
li);
m2pa_ud_li_tree = proto_item_add_subtree(m2pa_ud_li_item,
ett_m2pa_message_ud_li);
proto_tree_add_uint(m2pa_ud_li_tree, hf_m2pa_data_li_spare, message_tvb,
LI_OFFSET, LI_LENGTH, li);
proto_tree_add_uint(m2pa_ud_li_tree, hf_m2pa_data_li_prio, message_tvb,
LI_OFFSET, LI_LENGTH, li);
proto_item_set_text(m2pa_ud_item, "Protocol data (SS7 message of %u byte%s)",
payload_length, plurality(payload_length, "", "s"));
/* 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_tvb, USER_OFFSET, payload_length,
payload_length);
call_dissector(mtp3_handle, payload_tvb, pinfo, tree);
}
static void
dissect_m2pa_message(tvbuff_t *tvb, packet_info *pinfo, proto_item *m2pa_item,
proto_tree *m2pa_tree, proto_tree *tree)
{
guint8 version, spare;
guint16 message_type;
guint32 message_length;
tvbuff_t *message_tvb;
/* Extract the common header */
version = tvb_get_guint8(tvb, VERSION_OFFSET);
spare = tvb_get_guint8(tvb, SPARE_OFFSET);
message_type = tvb_get_ntohs(tvb, MESSAGE_TYPE_OFFSET);
message_length = tvb_get_ntohl(tvb, MESSAGE_LENGTH_OFFSET);
if (m2pa_tree) {
/* add the components of the common header to the protocol tree */
proto_tree_add_uint(m2pa_tree, hf_m2pa_version, tvb, VERSION_OFFSET,
VERSION_LENGTH, version);
proto_tree_add_uint(m2pa_tree, hf_m2pa_spare,
tvb, SPARE_OFFSET, SPARE_LENGTH,
spare);
proto_tree_add_uint(m2pa_tree, hf_m2pa_message_type, tvb,
MESSAGE_TYPE_OFFSET, MESSAGE_TYPE_LENGTH,
message_type);
proto_tree_add_uint(m2pa_tree, hf_m2pa_message_length,
tvb, MESSAGE_LENGTH_OFFSET, MESSAGE_LENGTH_LENGTH,
message_length);
};
/* create a tvb for the message */
message_tvb = tvb_new_subset(tvb, COMMON_HEADER_LENGTH, message_length,
message_length);
switch(message_type) {
case MESSAGE_TYPE_USER_DATA:
dissect_m2pa_user_data_message(message_tvb, pinfo, m2pa_item, m2pa_tree,
message_length, tree, message_type);
break;
case MESSAGE_TYPE_LINK_STATUS:
dissect_m2pa_link_status_message(message_tvb, pinfo, m2pa_tree,
message_type);
break;
default:
dissect_m2pa_unknown_message(message_tvb, pinfo, m2pa_tree,
message_length, message_type);
}
}
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->fd, COL_PROTOCOL))
col_set_str(pinfo->fd, COL_PROTOCOL, "M2PA");
/* Clear entries in Info column on summary display */
if (check_col(pinfo->fd, COL_INFO))
col_clear(pinfo->fd, COL_INFO);
/* 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,
COMMON_HEADER_LENGTH, 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_message_type,
{ "Message Type", "m2pa.message_type",
FT_UINT16, BASE_HEX, VALS(m2pa_message_type_values), 0x0,
"", HFILL}
},
{ &hf_m2pa_message_length,
{ "Message length", "m2pa.message_length",
FT_UINT32, BASE_DEC, NULL, 0x0,
"", HFILL}
},
{ &hf_m2pa_ls_status,
{ "Link Status Status", "m2pa.status",
FT_UINT32, BASE_DEC, VALS(m2pa_link_status_values), 0x0,
"", HFILL}
},
{ &hf_m2pa_data_li,
{ "Length Indicator", "m2pa.li",
FT_UINT8, BASE_HEX, NULL, 0x0,
"", HFILL}
},
{ &hf_m2pa_data_li_spare,
{ "Spare", "m2pa.li.spare",
FT_UINT8, BASE_HEX, NULL, LI_SPARE_MASK,
"", HFILL}
},
{ &hf_m2pa_data_li_prio,
{ "Priority", "m2pa.li.prio",
FT_UINT8, BASE_HEX, NULL, LI_PRIORITY_MASK,
"", HFILL}
}
};
/* Setup protocol subtree array */
static gint *ett[] = {
&ett_m2pa,
&ett_m2pa_message_ud,
&ett_m2pa_message_ud_li,
&ett_m2pa_message_ls
};
/* 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)
{
/*
* Get a handle for the MTP3 dissector.
*/
mtp3_handle = find_dissector("mtp3");
dissector_add("sctp.ppi", M2PA_PAYLOAD_PROTOCOL_ID,
dissect_m2pa, proto_m2pa);
dissector_add("sctp.port", SCTP_PORT_M2PA, dissect_m2pa, proto_m2pa);
}
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