403 lines
12 KiB
C
403 lines
12 KiB
C
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/* packet-m2pa.c
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* Routines for MTP2 Peer Adaptation Layer dissection
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* It is hopefully (needs testing) compliant to
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* http://www.ietf.org/internet-drafts/draft-ietf-sigtran-m2pa-02.txt
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*
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* Copyright 2001, Jeff Morriss <jeff.morriss[AT]ulticom.com>
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*
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* $Id: packet-m2pa.c,v 1.1 2001/06/21 22:25:51 guy Exp $
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*
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* Ethereal - Network traffic analyzer
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* By Gerald Combs <gerald@ethereal.com>
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* Copyright 1998 Gerald Combs
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*
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* Copied from packet-m3ua.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 <stdio.h>
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#include <stdlib.h>
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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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#ifdef HAVE_NETINET_IN_H
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# include <netinet/in.h>
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#endif
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#include <string.h>
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#include <glib.h>
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#ifdef NEED_SNPRINTF_H
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# include "snprintf.h"
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#endif
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#include "packet.h"
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#include "prefs.h"
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/* Warning: Neither of these are standardized yet! */
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#define SCTP_PORT_M2PA 2904
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#define M2PA_PAYLOAD_PROTOCOL_ID 5
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#define VERSION_LENGTH 1
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#define SPARE_LENGTH 1
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#define MESSAGE_TYPE_LENGTH 2
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#define MESSAGE_LENGTH_LENGTH 4
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#define COMMON_HEADER_LENGTH (VERSION_LENGTH + SPARE_LENGTH + \
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MESSAGE_TYPE_LENGTH + MESSAGE_LENGTH_LENGTH)
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#define VERSION_OFFSET 0
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#define SPARE_OFFSET (VERSION_OFFSET + VERSION_LENGTH)
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#define MESSAGE_TYPE_OFFSET (SPARE_OFFSET + SPARE_LENGTH)
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#define MESSAGE_LENGTH_OFFSET (MESSAGE_TYPE_OFFSET + MESSAGE_TYPE_LENGTH)
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#define PROTOCOL_VERSION_RELEASE_1 1
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static const value_string m2pa_protocol_version_values[] = {
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{ PROTOCOL_VERSION_RELEASE_1, "Release 1" },
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{ 0, NULL } };
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#define MESSAGE_TYPE_USER_DATA 0x0601
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#define MESSAGE_TYPE_LINK_STATUS 0x0602
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static const value_string m2pa_message_type_values[] = {
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{ MESSAGE_TYPE_USER_DATA, "User Data" },
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{ MESSAGE_TYPE_LINK_STATUS, "Link Status" },
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{ 0, NULL } };
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/* parts of User Data message */
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#define LI_OFFSET 0
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#define LI_LENGTH 1
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#define USER_OFFSET (LI_OFFSET + LI_LENGTH)
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/* LI is only used for (ITU national) priority in M2PA */
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#define LI_SPARE_MASK 0xfc
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#define LI_PRIORITY_MASK 0x3
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/* parts of Link Status message */
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#define STATUS_LENGTH 4
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#define STATUS_OFFSET 0
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#define STATUS_IS 1
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#define STATUS_PO 2
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#define STATUS_POE 3
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#define STATUS_BUSY 4
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#define STATUS_BUSY_E 5
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static const value_string m2pa_link_status_values[] = {
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{ STATUS_IS, "In Service" },
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{ STATUS_PO, "Processor Outage" },
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{ STATUS_POE, "Processor Outage Ended" },
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{ STATUS_BUSY, "Busy" },
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{ STATUS_BUSY_E, "Busy Ended" },
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{ 0, NULL } };
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/* Initialize the protocol and registered fields */
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static int proto_m2pa = -1;
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static int hf_m2pa_version = -1;
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static int hf_m2pa_spare = -1;
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static int hf_m2pa_message_type = -1;
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static int hf_m2pa_message_length = -1;
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static int hf_m2pa_ls_status = -1;
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static int hf_m2pa_data_li = -1;
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static int hf_m2pa_data_li_spare = -1;
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static int hf_m2pa_data_li_prio = -1;
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/* Initialize the subtree pointers */
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static gint ett_m2pa = -1;
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static gint ett_m2pa_message_ud = -1;
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static gint ett_m2pa_message_ud_li = -1;
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static gint ett_m2pa_message_ls = -1;
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static dissector_handle_t mtp3_handle;
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static void
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dissect_m2pa_unknown_message(tvbuff_t *message_tvb, packet_info *pinfo,
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proto_tree *m2pa_tree, guint32 message_length,
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guint16 message_type)
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{
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if (check_col(pinfo->fd, COL_INFO)) {
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col_set_str(pinfo->fd, COL_INFO,
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val_to_str(message_type, m2pa_message_type_values, "Unknown"));
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};
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if (m2pa_tree) {
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proto_tree_add_text(m2pa_tree, message_tvb, 0, message_length,
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"Unknown message (%u byte%s)",
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message_length, plurality(message_length, "", "s"));
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};
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}
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static void
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dissect_m2pa_link_status_message(tvbuff_t *message_tvb, packet_info *pinfo,
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proto_tree *m2pa_tree, guint16 message_type)
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{
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guint32 status;
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proto_item *m2pa_ls_item;
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proto_tree *m2pa_ls_tree;
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status = tvb_get_ntohl (message_tvb, STATUS_OFFSET);
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if (check_col(pinfo->fd, COL_INFO)) {
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col_set_str(pinfo->fd, COL_INFO,
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val_to_str(message_type, m2pa_message_type_values, "unknown"));
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col_append_str(pinfo->fd, COL_INFO, " (");
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col_append_str(pinfo->fd, COL_INFO,
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val_to_str(status, m2pa_link_status_values, "unknown"));
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col_append_str(pinfo->fd, COL_INFO, ")");
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};
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if (m2pa_tree) {
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/* create the link status message tree */
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m2pa_ls_item = proto_tree_add_text(m2pa_tree, message_tvb, 0,
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STATUS_LENGTH,
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val_to_str(message_type,
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m2pa_message_type_values,
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"Unknown"));
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m2pa_ls_tree = proto_item_add_subtree(m2pa_ls_item, ett_m2pa_message_ls);
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/* add the components of the link status message to the protocol tree */
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proto_tree_add_uint(m2pa_ls_tree, hf_m2pa_ls_status,
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message_tvb, STATUS_OFFSET,
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STATUS_LENGTH, status);
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};
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}
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static void
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dissect_m2pa_user_data_message(tvbuff_t *message_tvb, packet_info *pinfo,
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proto_item *m2pa_item, proto_tree *m2pa_tree,
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guint32 message_length, proto_tree *tree,
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guint16 message_type)
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{
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proto_item *m2pa_ud_item;
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proto_tree *m2pa_ud_tree;
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proto_item *m2pa_ud_li_item;
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proto_tree *m2pa_ud_li_tree;
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tvbuff_t *payload_tvb;
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guint8 li;
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guint32 payload_length;
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li = tvb_get_guint8(message_tvb, LI_OFFSET);
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payload_length = message_length - LI_LENGTH;
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if (m2pa_tree) {
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/* create the user data message tree */
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m2pa_ud_item = proto_tree_add_item(m2pa_tree, proto_m2pa, message_tvb, 0,
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tvb_length(message_tvb), FALSE);
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m2pa_ud_tree = proto_item_add_subtree(m2pa_ud_item, ett_m2pa_message_ud);
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/* add the components of the user data message to the protocol tree */
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/* LI */
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m2pa_ud_li_item = proto_tree_add_uint(m2pa_ud_tree, hf_m2pa_data_li,
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message_tvb, LI_OFFSET, LI_LENGTH,
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li);
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m2pa_ud_li_tree = proto_item_add_subtree(m2pa_ud_li_item,
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ett_m2pa_message_ud_li);
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proto_tree_add_uint(m2pa_ud_li_tree, hf_m2pa_data_li_spare, message_tvb,
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LI_OFFSET, LI_LENGTH, li);
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proto_tree_add_uint(m2pa_ud_li_tree, hf_m2pa_data_li_prio, message_tvb,
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LI_OFFSET, LI_LENGTH, li);
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proto_item_set_text(m2pa_ud_item, "Protocol data (SS7 message of %u byte%s)",
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payload_length, plurality(payload_length, "", "s"));
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/* Re-adjust length of M2PA item since it will be dissected as MTP3 */
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proto_item_set_len(m2pa_item, COMMON_HEADER_LENGTH + LI_LENGTH);
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};
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payload_tvb = tvb_new_subset(message_tvb, USER_OFFSET, payload_length,
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payload_length);
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call_dissector(mtp3_handle, payload_tvb, pinfo, tree);
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}
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static void
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dissect_m2pa_message(tvbuff_t *tvb, packet_info *pinfo, proto_item *m2pa_item,
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proto_tree *m2pa_tree, proto_tree *tree)
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{
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guint8 version, spare;
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guint16 message_type;
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guint32 message_length;
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tvbuff_t *message_tvb;
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/* Extract the common header */
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version = tvb_get_guint8(tvb, VERSION_OFFSET);
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spare = tvb_get_guint8(tvb, SPARE_OFFSET);
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message_type = tvb_get_ntohs(tvb, MESSAGE_TYPE_OFFSET);
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message_length = tvb_get_ntohl(tvb, MESSAGE_LENGTH_OFFSET);
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if (m2pa_tree) {
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/* add the components of the common header to the protocol tree */
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proto_tree_add_uint(m2pa_tree, hf_m2pa_version, tvb, VERSION_OFFSET,
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VERSION_LENGTH, version);
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proto_tree_add_uint(m2pa_tree, hf_m2pa_spare,
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tvb, SPARE_OFFSET, SPARE_LENGTH,
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spare);
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proto_tree_add_uint(m2pa_tree, hf_m2pa_message_type, tvb,
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MESSAGE_TYPE_OFFSET, MESSAGE_TYPE_LENGTH,
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message_type);
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proto_tree_add_uint(m2pa_tree, hf_m2pa_message_length,
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tvb, MESSAGE_LENGTH_OFFSET, MESSAGE_LENGTH_LENGTH,
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message_length);
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};
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/* create a tvb for the message */
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message_tvb = tvb_new_subset(tvb, COMMON_HEADER_LENGTH, message_length,
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message_length);
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switch(message_type) {
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case MESSAGE_TYPE_USER_DATA:
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dissect_m2pa_user_data_message(message_tvb, pinfo, m2pa_item, m2pa_tree,
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message_length, tree, message_type);
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break;
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case MESSAGE_TYPE_LINK_STATUS:
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dissect_m2pa_link_status_message(message_tvb, pinfo, m2pa_tree,
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message_type);
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break;
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default:
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dissect_m2pa_unknown_message(message_tvb, pinfo, m2pa_tree,
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message_length, message_type);
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}
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}
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static void
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dissect_m2pa(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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proto_item *m2pa_item;
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proto_tree *m2pa_tree;
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/* make entry in the Protocol column on summary display */
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if (check_col(pinfo->fd, COL_PROTOCOL))
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col_set_str(pinfo->fd, COL_PROTOCOL, "M2PA");
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/* Clear entries in Info column on summary display */
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if (check_col(pinfo->fd, COL_INFO))
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col_clear(pinfo->fd, COL_INFO);
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/* In the interest of speed, if "tree" is NULL, don't do any work not
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necessary to generate protocol tree items. */
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if (tree) {
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/* create the m2pa protocol tree */
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m2pa_item = proto_tree_add_item(tree, proto_m2pa, tvb, 0,
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COMMON_HEADER_LENGTH, FALSE);
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m2pa_tree = proto_item_add_subtree(m2pa_item, ett_m2pa);
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} else {
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m2pa_item = NULL;
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m2pa_tree = NULL;
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};
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/* dissect the message */
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dissect_m2pa_message(tvb, pinfo, m2pa_item, m2pa_tree, tree);
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}
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/* Register the protocol with Ethereal */
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void
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proto_register_m2pa(void)
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{
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/* Setup list of header fields */
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static hf_register_info hf[] = {
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{ &hf_m2pa_version,
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{ "Version", "m2pa.version",
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FT_UINT8, BASE_DEC, VALS(m2pa_protocol_version_values), 0x0,
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"", HFILL}
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},
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{ &hf_m2pa_spare,
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{ "Spare", "m2pa.spare",
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FT_UINT8, BASE_HEX, NULL, 0x0,
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"", HFILL}
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},
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{ &hf_m2pa_message_type,
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{ "Message Type", "m2pa.message_type",
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FT_UINT16, BASE_HEX, VALS(m2pa_message_type_values), 0x0,
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"", HFILL}
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},
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{ &hf_m2pa_message_length,
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{ "Message length", "m2pa.message_length",
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FT_UINT32, BASE_DEC, NULL, 0x0,
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"", HFILL}
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},
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{ &hf_m2pa_ls_status,
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{ "Link Status Status", "m2pa.status",
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FT_UINT32, BASE_DEC, VALS(m2pa_link_status_values), 0x0,
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"", HFILL}
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},
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{ &hf_m2pa_data_li,
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{ "Length Indicator", "m2pa.li",
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FT_UINT8, BASE_HEX, NULL, 0x0,
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"", HFILL}
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},
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{ &hf_m2pa_data_li_spare,
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{ "Spare", "m2pa.li.spare",
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FT_UINT8, BASE_HEX, NULL, LI_SPARE_MASK,
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"", HFILL}
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},
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{ &hf_m2pa_data_li_prio,
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{ "Priority", "m2pa.li.prio",
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FT_UINT8, BASE_HEX, NULL, LI_PRIORITY_MASK,
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"", HFILL}
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}
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};
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/* Setup protocol subtree array */
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static gint *ett[] = {
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&ett_m2pa,
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&ett_m2pa_message_ud,
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&ett_m2pa_message_ud_li,
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&ett_m2pa_message_ls
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};
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/* Register the protocol name and description */
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proto_m2pa = proto_register_protocol("MTP2 Peer Adaptation Layer",
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"M2PA", "m2pa");
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/* Required function calls to register the header fields and subtrees used */
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proto_register_field_array(proto_m2pa, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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};
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void
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proto_reg_handoff_m2pa(void)
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{
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/*
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* Get a handle for the MTP3 dissector.
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*/
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mtp3_handle = find_dissector("mtp3");
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dissector_add("sctp.ppi", M2PA_PAYLOAD_PROTOCOL_ID,
|
||
|
dissect_m2pa, proto_m2pa);
|
||
|
dissector_add("sctp.port", SCTP_PORT_M2PA, dissect_m2pa, proto_m2pa);
|
||
|
}
|