M2UA support, from Michael Tuexen.

svn path=/trunk/; revision=5160

1 files changed, 1387 insertions, 0 deletions

diff --git a/packet-m2ua.c b/packet-m2ua.c
new file mode 100644
index 0000000000..947d612e5c
--- /dev/null
+++ b/packet-m2ua.c
@@ -0,0 +1,1387 @@
+/* packet-m2ua.c
+ * Routines for MTP2 User Adaptation Layer dissection
+ * It is hopefully (needs testing) compilant to
+ * http://www.ietf.org/internet-drafts/draft-ietf-sigtran-m2ua-15.txt
+ * To do: - clean up the code
+ *        - provide better handling of length parameters
+ *        - provide good information in summary window
+ *
+ * Copyright 2002, Michael Tuexen <Michael.Tuexen@icn.siemens.de>
+ *
+ * $Id: packet-m2ua.c,v 1.1 2002/04/14 22:52:49 guy Exp $
+ *
+ * Ethereal - Network traffic analyzer
+ * By Gerald Combs <gerald@ethereal.com>
+ * Copyright 1998 Gerald Combs
+ *
+ * Copied from README.developer
+ * 
+ * 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>
+
+// #include <string.h>
+// #include <glib.h>
+
+#include <epan/packet.h>
+
+#define SCTP_PORT_M2UA         2904
+#define M2UA_PAYLOAD_PROTO_ID  2
+
+
+
+
+/* Initialize the protocol and registered fields */
+static int proto_m2ua = -1;
+static int hf_m2ua_version = -1;
+static int hf_m2ua_reserved = -1;
+static int hf_m2ua_message_class = -1;
+static int hf_m2ua_message_type = -1;
+static int hf_m2ua_message_length = -1;
+static int hf_m2ua_parameter_tag = -1;
+static int hf_m2ua_parameter_length = -1;
+static int hf_m2ua_parameter_value = -1;
+static int hf_m2ua_parameter_padding = -1;
+static int hf_m2ua_interface_id_int = -1;
+static int hf_m2ua_interface_id_text = -1;
+static int hf_m2ua_info_string = -1;
+static int hf_m2ua_diagnostic_information = -1;
+static int hf_m2ua_interface_id_start = -1;
+static int hf_m2ua_interface_id_stop = -1;
+static int hf_m2ua_heartbeat_data = -1;
+static int hf_m2ua_traffic_mode_type = -1;
+static int hf_m2ua_error_code = -1;
+static int hf_m2ua_status_type = -1;
+static int hf_m2ua_status_info = -1;
+static int hf_m2ua_asp_id = -1;
+static int hf_m2ua_correlation_id = -1;
+static int hf_m2ua_data_2_li = -1;
+static int hf_m2ua_state = -1;
+static int hf_m2ua_event = -1;
+static int hf_m2ua_congestion_status = -1;
+static int hf_m2ua_discard_status = -1;
+static int hf_m2ua_action = -1;
+static int hf_m2ua_sequence_number = -1;
+static int hf_m2ua_retrieval_result = -1;
+static int hf_m2ua_local_lk_id = -1;
+static int hf_m2ua_sdt_reserved = -1;
+static int hf_m2ua_sdt_id = -1;
+static int hf_m2ua_sdl_reserved = -1;
+static int hf_m2ua_sdl_id = -1;
+static int hf_m2ua_registration_status = -1;
+static int hf_m2ua_deregistration_status = -1;
+
+/* Initialize the subtree pointers */
+static gint ett_m2ua = -1;
+static gint ett_m2ua_parameter = -1;
+
+static dissector_handle_t mtp3_handle;
+
+static void
+dissect_m2ua_parameters(tvbuff_t *, packet_info *, proto_tree *, proto_tree *);
+
+static guint 
+nr_of_padding_bytes (guint length)
+{
+  guint remainder;
+
+  remainder = length % 4;
+
+  if (remainder == 0)
+    return 0;
+  else
+    return 4 - remainder;
+}
+
+#define VERSION_LENGTH         1
+#define RESERVED_LENGTH        1
+#define MESSAGE_CLASS_LENGTH   1
+#define MESSAGE_TYPE_LENGTH    1
+#define MESSAGE_LENGTH_LENGTH  4
+#define COMMON_HEADER_LENGTH   (VERSION_LENGTH + RESERVED_LENGTH + MESSAGE_CLASS_LENGTH + \
+                                MESSAGE_TYPE_LENGTH + MESSAGE_LENGTH_LENGTH)
+
+#define VERSION_OFFSET         0
+#define RESERVED_OFFSET        (VERSION_OFFSET + VERSION_LENGTH)
+#define MESSAGE_CLASS_OFFSET   (RESERVED_OFFSET + RESERVED_LENGTH)
+#define MESSAGE_TYPE_OFFSET    (MESSAGE_CLASS_OFFSET + MESSAGE_CLASS_LENGTH)
+#define MESSAGE_LENGTH_OFFSET  (MESSAGE_TYPE_OFFSET + MESSAGE_TYPE_LENGTH)
+
+#define PROTOCOL_VERSION_RELEASE_1             1
+
+static const value_string m2ua_protocol_version_values[] = {
+  { PROTOCOL_VERSION_RELEASE_1,  "Release 1" },
+  { 0,                           NULL } };
+  
+#define MESSAGE_CLASS_MGMT_MESSAGE         0
+#define MESSAGE_CLASS_ASPSM_MESSAGE        3
+#define MESSAGE_CLASS_ASPTM_MESSAGE        4
+#define MESSAGE_CLASS_MAUP_MESSAGE         6
+#define MESSAGE_CLASS_IIM_MESSAGE         10
+
+static const value_string m2ua_message_class_values[] = {
+  { MESSAGE_CLASS_MGMT_MESSAGE,   "Management messages" },
+  { MESSAGE_CLASS_ASPSM_MESSAGE,  "ASP state maintenance messages" },
+  { MESSAGE_CLASS_ASPTM_MESSAGE,  "ASP traffic maintenance messages" },
+  { MESSAGE_CLASS_MAUP_MESSAGE,   "MTP2 user adaptation messages" },
+  { MESSAGE_CLASS_IIM_MESSAGE,    "Interface identifier management messages" },
+  { 0,                            NULL } };
+
+/* MGMT */
+#define MESSAGE_TYPE_ERR                  0
+#define MESSAGE_TYPE_NTFY                 1
+
+/* ASPSM */
+#define MESSAGE_TYPE_UP                   1
+#define MESSAGE_TYPE_DOWN                 2
+#define MESSAGE_TYPE_BEAT                 3
+#define MESSAGE_TYPE_UP_ACK               4
+#define MESSAGE_TYPE_DOWN_ACK             5
+#define MESSAGE_TYPE_BEAT_ACK             6
+
+/* ASPTM */
+#define MESSAGE_TYPE_ACTIVE               1
+#define MESSAGE_TYPE_INACTIVE             2
+#define MESSAGE_TYPE_ACTIVE_ACK           3
+#define MESSAGE_TYPE_INACTIVE_ACK         4
+
+/* MAUP */
+#define MESSAGE_TYPE_DATA                 1
+#define MESSAGE_TYPE_ESTAB_REQ            2
+#define MESSAGE_TYPE_ESTAB_CONF           3
+#define MESSAGE_TYPE_REL_REQ              4
+#define MESSAGE_TYPE_REL_CONF             5
+#define MESSAGE_TYPE_REL_IND              6
+#define MESSAGE_TYPE_STATE_REQ            7
+#define MESSAGE_TYPE_STATE_CONF           8
+#define MESSAGE_TYPE_STATE_IND            9
+#define MESSAGE_TYPE_DATA_RETR_REQ       10
+#define MESSAGE_TYPE_DATA_RETR_CONF      11
+#define MESSAGE_TYPE_DATA_RETR_IND       12
+#define MESSAGE_TYPE_DATA_RETR_COMP_IND  13
+#define MESSAGE_TYPE_CONG_IND            14
+#define MESSAGE_TYPE_DATA_ACK            15
+
+/* IIM */
+#define MESSAGE_TYPE_REG_REQ              1
+#define MESSAGE_TYPE_REG_RSP              2
+#define MESSAGE_TYPE_DEREG_REQ            3
+#define MESSAGE_TYPE_DEREG_RSP            4
+
+static const value_string m2ua_message_class_type_values[] = {
+  { MESSAGE_CLASS_MGMT_MESSAGE  * 256 + MESSAGE_TYPE_ERR,                "Error (ERR)" },
+  { MESSAGE_CLASS_MGMT_MESSAGE  * 256 + MESSAGE_TYPE_NTFY,               "Notify (NTFY)" },
+  { MESSAGE_CLASS_ASPSM_MESSAGE * 256 + MESSAGE_TYPE_UP,                 "ASP up (UP)" },
+  { MESSAGE_CLASS_ASPSM_MESSAGE * 256 + MESSAGE_TYPE_DOWN,               "ASP down (DOWN)" },
+  { MESSAGE_CLASS_ASPSM_MESSAGE * 256 + MESSAGE_TYPE_BEAT,               "Heartbeat (BEAT)" },
+  { MESSAGE_CLASS_ASPSM_MESSAGE * 256 + MESSAGE_TYPE_UP_ACK,             "ASP up ack (UP ACK)" },
+  { MESSAGE_CLASS_ASPSM_MESSAGE * 256 + MESSAGE_TYPE_DOWN_ACK,           "ASP down ack (DOWN ACK)" },
+  { MESSAGE_CLASS_ASPSM_MESSAGE * 256 + MESSAGE_TYPE_BEAT_ACK,           "Heartbeat ack (BEAT ACK)" },
+  { MESSAGE_CLASS_ASPTM_MESSAGE * 256 + MESSAGE_TYPE_ACTIVE ,            "ASP active (ACTIVE)" },
+  { MESSAGE_CLASS_ASPTM_MESSAGE * 256 + MESSAGE_TYPE_INACTIVE ,          "ASP inactive (INACTIVE)" },
+  { MESSAGE_CLASS_ASPTM_MESSAGE * 256 + MESSAGE_TYPE_ACTIVE_ACK ,        "ASP active ack (ACTIVE ACK)" },
+  { MESSAGE_CLASS_ASPTM_MESSAGE * 256 + MESSAGE_TYPE_INACTIVE_ACK ,      "ASP inactive ack (INACTIVE ACK)" },
+  { MESSAGE_CLASS_MAUP_MESSAGE  * 256 + MESSAGE_TYPE_DATA,               "DATA (DATA)" },
+  { MESSAGE_CLASS_MAUP_MESSAGE  * 256 + MESSAGE_TYPE_ESTAB_REQ,          "Establish request (ESTAB_REQ)" },
+  { MESSAGE_CLASS_MAUP_MESSAGE  * 256 + MESSAGE_TYPE_ESTAB_CONF,         "Establish confirm (ESTAB_CONF)" },
+  { MESSAGE_CLASS_MAUP_MESSAGE  * 256 + MESSAGE_TYPE_REL_REQ,            "Release request (REL_REQ)" },
+  { MESSAGE_CLASS_MAUP_MESSAGE  * 256 + MESSAGE_TYPE_REL_CONF,           "Release confirm (REL_CONF)" },
+  { MESSAGE_CLASS_MAUP_MESSAGE  * 256 + MESSAGE_TYPE_REL_IND,            "Release indication (REL_IND)" },
+  { MESSAGE_CLASS_MAUP_MESSAGE  * 256 + MESSAGE_TYPE_STATE_REQ,          "State request (STATE_REQ)" },
+  { MESSAGE_CLASS_MAUP_MESSAGE  * 256 + MESSAGE_TYPE_STATE_CONF,         "State confirm (STATE_CONF)" },
+  { MESSAGE_CLASS_MAUP_MESSAGE  * 256 + MESSAGE_TYPE_STATE_IND,          "State indication (STATE_IND)" },
+  { MESSAGE_CLASS_MAUP_MESSAGE  * 256 + MESSAGE_TYPE_DATA_RETR_REQ,      "Data retrieval request (DATA_RETR_REQ)" },
+  { MESSAGE_CLASS_MAUP_MESSAGE  * 256 + MESSAGE_TYPE_DATA_RETR_CONF,     "Data retrieval confirm (DATA_RETR_CONF)" },
+  { MESSAGE_CLASS_MAUP_MESSAGE  * 256 + MESSAGE_TYPE_DATA_RETR_IND,      "Data retrieval indication (DATA_RETR_IND)" },
+  { MESSAGE_CLASS_MAUP_MESSAGE  * 256 + MESSAGE_TYPE_DATA_RETR_COMP_IND, "Data retrieval complete indication (DATA_RETR_COMP_IND)" },
+  { MESSAGE_CLASS_MAUP_MESSAGE  * 256 + MESSAGE_TYPE_CONG_IND,           "Congestion indication (CONG_IND)" },
+  { MESSAGE_CLASS_MAUP_MESSAGE  * 256 + MESSAGE_TYPE_DATA_ACK,           "Data acknowledge (DATA_ACK)" },
+  { MESSAGE_CLASS_IIM_MESSAGE   * 256 + MESSAGE_TYPE_REG_REQ ,           "Registration request (REG_REQ)" },
+  { MESSAGE_CLASS_IIM_MESSAGE   * 256 + MESSAGE_TYPE_REG_RSP ,           "Registration response (REG_RSP)" },
+  { MESSAGE_CLASS_IIM_MESSAGE   * 256 + MESSAGE_TYPE_DEREG_REQ ,         "Deregistration request (DEREG_REQ)" },
+  { MESSAGE_CLASS_IIM_MESSAGE   * 256 + MESSAGE_TYPE_DEREG_RSP ,         "Deregistration response (DEREG_RSP)" },
+  { 0,                           NULL } };
+
+static const value_string m2ua_message_class_type_acro_values[] = {
+  { MESSAGE_CLASS_MGMT_MESSAGE  * 256 + MESSAGE_TYPE_ERR,                "ERR" },
+  { MESSAGE_CLASS_MGMT_MESSAGE  * 256 + MESSAGE_TYPE_NTFY,               "NTFY" },
+  { MESSAGE_CLASS_ASPSM_MESSAGE * 256 + MESSAGE_TYPE_UP,                 "ASP_UP" },
+  { MESSAGE_CLASS_ASPSM_MESSAGE * 256 + MESSAGE_TYPE_DOWN,               "ASP_DOWN" },
+  { MESSAGE_CLASS_ASPSM_MESSAGE * 256 + MESSAGE_TYPE_BEAT,               "BEAT" },
+  { MESSAGE_CLASS_ASPSM_MESSAGE * 256 + MESSAGE_TYPE_UP_ACK,             "ASP_UP_ACK" },
+  { MESSAGE_CLASS_ASPSM_MESSAGE * 256 + MESSAGE_TYPE_DOWN_ACK,           "ASP_DOWN_ACK" },
+  { MESSAGE_CLASS_ASPSM_MESSAGE * 256 + MESSAGE_TYPE_BEAT_ACK,           "BEAT_ACK" },
+  { MESSAGE_CLASS_ASPTM_MESSAGE * 256 + MESSAGE_TYPE_ACTIVE ,            "ASP_ACTIVE" },
+  { MESSAGE_CLASS_ASPTM_MESSAGE * 256 + MESSAGE_TYPE_INACTIVE ,          "ASP_INACTIVE" },
+  { MESSAGE_CLASS_ASPTM_MESSAGE * 256 + MESSAGE_TYPE_ACTIVE_ACK ,        "ASP_ACTIVE_ACK" },
+  { MESSAGE_CLASS_ASPTM_MESSAGE * 256 + MESSAGE_TYPE_INACTIVE_ACK ,      "ASP_INACTIVE_ACK" },
+  { MESSAGE_CLASS_MAUP_MESSAGE  * 256 + MESSAGE_TYPE_DATA,               "DATA" },
+  { MESSAGE_CLASS_MAUP_MESSAGE  * 256 + MESSAGE_TYPE_ESTAB_REQ,          "ESTAB_REQ" },
+  { MESSAGE_CLASS_MAUP_MESSAGE  * 256 + MESSAGE_TYPE_ESTAB_CONF,         "ESTAB_CONF" },
+  { MESSAGE_CLASS_MAUP_MESSAGE  * 256 + MESSAGE_TYPE_REL_REQ,            "REL_REQ" },
+  { MESSAGE_CLASS_MAUP_MESSAGE  * 256 + MESSAGE_TYPE_REL_CONF,           "REL_CONF" },
+  { MESSAGE_CLASS_MAUP_MESSAGE  * 256 + MESSAGE_TYPE_REL_IND,            "REL_IND" },
+  { MESSAGE_CLASS_MAUP_MESSAGE  * 256 + MESSAGE_TYPE_STATE_REQ,          "STATE_REQ" },
+  { MESSAGE_CLASS_MAUP_MESSAGE  * 256 + MESSAGE_TYPE_STATE_CONF,         "STATE_CONF" },
+  { MESSAGE_CLASS_MAUP_MESSAGE  * 256 + MESSAGE_TYPE_STATE_IND,          "STATE_IND" },
+  { MESSAGE_CLASS_MAUP_MESSAGE  * 256 + MESSAGE_TYPE_DATA_RETR_REQ,      "DATA_RETR_REQ" },
+  { MESSAGE_CLASS_MAUP_MESSAGE  * 256 + MESSAGE_TYPE_DATA_RETR_CONF,     "DATA_RETR_CONF" },
+  { MESSAGE_CLASS_MAUP_MESSAGE  * 256 + MESSAGE_TYPE_DATA_RETR_IND,      "DATA_RETR_IND" },
+  { MESSAGE_CLASS_MAUP_MESSAGE  * 256 + MESSAGE_TYPE_DATA_RETR_COMP_IND, "DATA_RETR_COMP_IND" },
+  { MESSAGE_CLASS_MAUP_MESSAGE  * 256 + MESSAGE_TYPE_CONG_IND,           "CONG_IND" },
+  { MESSAGE_CLASS_MAUP_MESSAGE  * 256 + MESSAGE_TYPE_DATA_ACK,           "DATA_ACK" },
+  { MESSAGE_CLASS_IIM_MESSAGE   * 256 + MESSAGE_TYPE_REG_REQ ,           "REG_REQ" },
+  { MESSAGE_CLASS_IIM_MESSAGE   * 256 + MESSAGE_TYPE_REG_RSP ,           "REG_RSP" },
+  { MESSAGE_CLASS_IIM_MESSAGE   * 256 + MESSAGE_TYPE_DEREG_REQ ,         "DEREG_REQ" },
+  { MESSAGE_CLASS_IIM_MESSAGE   * 256 + MESSAGE_TYPE_DEREG_RSP ,         "DEREG_RSP" },
+  { 0,                           NULL } };
+
+static void
+dissect_m2ua_common_header(tvbuff_t *common_header_tvb, packet_info *pinfo, proto_tree *m2ua_tree)
+{
+  guint8  version, reserved, message_class, message_type;
+  guint32 message_length;
+  
+  /* Extract the common header */
+  version        = tvb_get_guint8(common_header_tvb, VERSION_OFFSET);
+  reserved       = tvb_get_guint8(common_header_tvb, RESERVED_OFFSET);
+  message_class  = tvb_get_guint8(common_header_tvb, MESSAGE_CLASS_OFFSET);
+  message_type   = tvb_get_guint8(common_header_tvb, MESSAGE_TYPE_OFFSET);
+  message_length = tvb_get_ntohl (common_header_tvb, MESSAGE_LENGTH_OFFSET);
+
+  if (check_col(pinfo->cinfo, COL_INFO)) {
+    col_append_str(pinfo->cinfo, COL_INFO, val_to_str(message_class * 256 + message_type, m2ua_message_class_type_acro_values, "reserved"));
+    col_append_str(pinfo->cinfo, COL_INFO, " ");
+  }
+
+  if (m2ua_tree) {
+    /* add the components of the common header to the protocol tree */
+    proto_tree_add_uint(m2ua_tree, hf_m2ua_version, common_header_tvb, VERSION_OFFSET, VERSION_LENGTH, version);
+    proto_tree_add_uint(m2ua_tree, hf_m2ua_reserved, common_header_tvb, RESERVED_OFFSET, RESERVED_LENGTH, reserved);
+    proto_tree_add_uint(m2ua_tree, hf_m2ua_message_class, common_header_tvb, MESSAGE_CLASS_OFFSET, MESSAGE_CLASS_LENGTH, message_class);
+    proto_tree_add_uint_format(m2ua_tree, hf_m2ua_message_type, common_header_tvb, MESSAGE_TYPE_OFFSET, MESSAGE_TYPE_LENGTH, message_type,
+                               "Message type: %s (%u)", 
+                               val_to_str(message_class * 256 + message_type, m2ua_message_class_type_values, "reserved"), message_type);
+    proto_tree_add_uint(m2ua_tree, hf_m2ua_message_length, common_header_tvb, MESSAGE_LENGTH_OFFSET, MESSAGE_LENGTH_LENGTH, message_length);
+  }
+}
+
+#define PARAMETER_TAG_LENGTH    2
+#define PARAMETER_LENGTH_LENGTH 2
+#define PARAMETER_HEADER_LENGTH (PARAMETER_TAG_LENGTH + PARAMETER_LENGTH_LENGTH)
+
+#define PARAMETER_TAG_OFFSET    0
+#define PARAMETER_LENGTH_OFFSET (PARAMETER_TAG_OFFSET + PARAMETER_TAG_LENGTH)
+#define PARAMETER_VALUE_OFFSET  (PARAMETER_LENGTH_OFFSET + PARAMETER_LENGTH_LENGTH)
+#define PARAMETER_HEADER_OFFSET PARAMETER_TAG_OFFSET
+
+
+#define INTERFACE_IDENTIFIER_INT_LENGTH 4
+#define INTERFACE_IDENTIFIER_INT_OFFSET PARAMETER_VALUE_OFFSET
+
+static void
+dissect_m2ua_interface_identifier_int_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item)
+{
+  guint32 id;
+
+  id = tvb_get_ntohl(parameter_tvb, INTERFACE_IDENTIFIER_INT_OFFSET);
+  proto_tree_add_uint(parameter_tree, hf_m2ua_interface_id_int, parameter_tvb, INTERFACE_IDENTIFIER_INT_OFFSET, INTERFACE_IDENTIFIER_INT_LENGTH, id);
+  proto_item_set_text(parameter_item, "Interface identifier parameter (integer: %u)", id);
+}
+
+#define INTERFACE_IDENTIFIER_TEXT_OFFSET PARAMETER_VALUE_OFFSET
+
+static void
+dissect_m2ua_interface_identifier_text_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item)
+{
+  guint16 length, id_length;
+  char *id;
+
+  length = tvb_get_ntohs(parameter_tvb, PARAMETER_LENGTH_OFFSET);
+  
+  id_length = length - PARAMETER_HEADER_LENGTH;
+  id        = (char *)tvb_get_ptr(parameter_tvb, INTERFACE_IDENTIFIER_TEXT_OFFSET, id_length);
+  proto_tree_add_string(parameter_tree, hf_m2ua_interface_id_text, parameter_tvb, INTERFACE_IDENTIFIER_TEXT_OFFSET, id_length, id);
+  proto_item_set_text(parameter_item, "Interface identifier (Text: %.*s)", id_length, id);
+}
+
+#define INFO_STRING_OFFSET PARAMETER_VALUE_OFFSET
+
+static void
+dissect_m2ua_info_string_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item)
+{
+  guint16 length, info_string_length;
+  char *info_string;
+
+  length = tvb_get_ntohs(parameter_tvb, PARAMETER_LENGTH_OFFSET);
+  
+  info_string_length = length - PARAMETER_HEADER_LENGTH;
+  info_string        = (char *)tvb_get_ptr(parameter_tvb, INFO_STRING_OFFSET, info_string_length);
+  proto_tree_add_string(parameter_tree, hf_m2ua_info_string, parameter_tvb, INFO_STRING_OFFSET, info_string_length, info_string);
+  proto_item_set_text(parameter_item, "Info String (%.*s)", info_string_length, info_string);
+}
+
+#define DIAGNOSTIC_INFO_OFFSET PARAMETER_VALUE_OFFSET
+
+static void
+dissect_m2ua_diagnostic_information_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item)
+{
+  guint16 length, diagnostic_info_length;
+  
+  length                 = tvb_get_ntohs(parameter_tvb, PARAMETER_LENGTH_OFFSET);
+  diagnostic_info_length = length - PARAMETER_HEADER_LENGTH;
+
+  if (diagnostic_info_length > 0)
+    proto_tree_add_bytes(parameter_tree, hf_m2ua_diagnostic_information, parameter_tvb, DIAGNOSTIC_INFO_OFFSET, diagnostic_info_length,
+                         tvb_get_ptr(parameter_tvb, DIAGNOSTIC_INFO_OFFSET, diagnostic_info_length));
+
+  proto_item_set_text(parameter_item, "Diagnostic information (%u byte%s)", diagnostic_info_length, plurality(diagnostic_info_length, "", "s"));
+}
+
+#define START_OFFSET 0
+#define STOP_OFFSET  (START_OFFSET + INTERFACE_IDENTIFIER_INT_LENGTH)
+
+static void
+dissect_m2ua_interface_identifier_range_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item)
+{
+  guint16 length, number_of_ranges, range_number;
+  guint32 start, stop;
+  gint range_offset;
+
+  length = tvb_get_ntohs(parameter_tvb, PARAMETER_LENGTH_OFFSET);
+  number_of_ranges = (length - PARAMETER_HEADER_LENGTH) / (2 * INTERFACE_IDENTIFIER_INT_LENGTH);
+  range_offset = PARAMETER_VALUE_OFFSET;
+  for(range_number=1; range_number <= number_of_ranges; range_number++) {
+    start = tvb_get_ntohl(parameter_tvb, range_offset + START_OFFSET);
+    stop  = tvb_get_ntohl(parameter_tvb, range_offset + STOP_OFFSET);
+    proto_tree_add_uint(parameter_tree, hf_m2ua_interface_id_start, parameter_tvb, range_offset + START_OFFSET, INTERFACE_IDENTIFIER_INT_LENGTH, start);
+    proto_tree_add_uint(parameter_tree, hf_m2ua_interface_id_stop,  parameter_tvb, range_offset + STOP_OFFSET,  INTERFACE_IDENTIFIER_INT_LENGTH, stop);
+    range_offset += 2 * INTERFACE_IDENTIFIER_INT_LENGTH;
+  }
+  proto_item_set_text(parameter_item, "Interface identifier (%u range%s)", number_of_ranges, plurality(number_of_ranges, "", "s"));
+}
+
+#define HEARTBEAT_DATA_OFFSET PARAMETER_VALUE_OFFSET
+
+static void
+dissect_m2ua_heartbeat_data_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item)
+{
+  guint16 length, heartbeat_data_length;
+  
+  length                = tvb_get_ntohs(parameter_tvb, PARAMETER_LENGTH_OFFSET);
+  heartbeat_data_length = length - PARAMETER_HEADER_LENGTH;
+
+  if (heartbeat_data_length > 0) 
+    proto_tree_add_bytes(parameter_tree, hf_m2ua_heartbeat_data, parameter_tvb, HEARTBEAT_DATA_OFFSET, heartbeat_data_length,
+      	                 tvb_get_ptr(parameter_tvb, HEARTBEAT_DATA_OFFSET, heartbeat_data_length));
+
+  proto_item_set_text(parameter_item, "Heartbeat data (%u byte%s)", heartbeat_data_length, plurality(heartbeat_data_length, "", "s"));
+}
+
+#define OVER_RIDE_TYPE   1
+#define LOAD_SHARE_TYPE  2
+#define BROADCAST_TYPE   3
+
+static const value_string m2ua_traffic_mode_type_values[] = {
+  { OVER_RIDE_TYPE ,                             "Over-ride" },
+  { LOAD_SHARE_TYPE,                             "Load-share" },
+  { BROADCAST_TYPE,                              "Broadcast" },
+  {0,                           NULL } };
+
+#define TRAFFIC_MODE_TYPE_LENGTH 4
+#define TRAFFIC_MODE_TYPE_OFFSET PARAMETER_VALUE_OFFSET
+
+static void
+dissect_m2ua_traffic_mode_type_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item)
+{
+  guint32 traffic_mode_type;
+
+  traffic_mode_type = tvb_get_ntohl(parameter_tvb, TRAFFIC_MODE_TYPE_OFFSET);
+  proto_tree_add_uint(parameter_tree, hf_m2ua_traffic_mode_type, parameter_tvb, TRAFFIC_MODE_TYPE_OFFSET, TRAFFIC_MODE_TYPE_LENGTH, traffic_mode_type);
+   
+  proto_item_set_text(parameter_item, "Traffic mode type parameter (%s)", val_to_str(traffic_mode_type, m2ua_traffic_mode_type_values, "unknown"));
+
+}
+
+#define INVALID_VERSION_ERROR_CODE                       0x01
+#define INVALID_INTERFACE_IDENTIFIER_ERROR_CODE          0x02
+#define UNSUPPORTED_MESSAGE_CLASS_ERROR_CODE             0x03
+#define UNSUPPORTED_MESSAGE_TYPE_ERROR_CODE              0x04
+#define UNSUPPORTED_TRAFFIC_HANDLING_MODE_ERROR_CODE     0x05
+#define UNEXPECTED_MESSAGE_ERROR_CODE                    0x06
+#define PROTOCOL_ERROR_ERROR_CODE                        0x07
+#define UNSUPPORTED_INTERFACE_IDENTIFIER_TYPE_ERROR_CODE 0x08
+#define INVALID_STREAM_IDENTIFIER_ERROR_CODE             0x09
+#define REFUSED_ERROR_CODE                               0x0d
+#define ASP_IDENTIFIER_REQUIRED_ERROR_CODE               0x0e
+#define INVALID_ASP_IDENTIFIER_ERROR_CODE                0x0f
+#define ASP_ACTIVE_FOR_INTERFACE_IDENTIFIER_ERROR_CODE   0x10
+#define INVALID_PARAMETER_VALUE_ERROR_CODE               0x11
+#define PARAMETER_FIELD_ERROR_CODE                       0x12
+#define UNEXPECTED_PARAMETER_ERROR_CODE                  0x13
+#define MISSING_PARAMETER_ERROR_CODE                     0x16
+
+static const value_string m2ua_error_code_values[] = {
+  { INVALID_VERSION_ERROR_CODE,                       "Invalid version" },
+  { INVALID_INTERFACE_IDENTIFIER_ERROR_CODE,          "Invalid interface identifier" },
+  { UNSUPPORTED_MESSAGE_CLASS_ERROR_CODE,             "Unsupported message class" },
+  { UNSUPPORTED_MESSAGE_TYPE_ERROR_CODE,              "Unsupported message type" },
+  { UNSUPPORTED_TRAFFIC_HANDLING_MODE_ERROR_CODE,     "Unsupported traffic handling mode" },
+  { UNEXPECTED_MESSAGE_ERROR_CODE,                    "Unexpected message" },
+  { PROTOCOL_ERROR_ERROR_CODE,                        "Protocol error" },
+  { UNSUPPORTED_INTERFACE_IDENTIFIER_TYPE_ERROR_CODE, "Unsupported interface identifertype" },
+  { INVALID_STREAM_IDENTIFIER_ERROR_CODE,             "Invalid stream identifier" },
+  { REFUSED_ERROR_CODE,                               "Refused - management blocking" },
+  { ASP_IDENTIFIER_REQUIRED_ERROR_CODE,               "ASP identifier required" },
+  { INVALID_ASP_IDENTIFIER_ERROR_CODE,                "Invalid ASP identifier" },
+  { ASP_ACTIVE_FOR_INTERFACE_IDENTIFIER_ERROR_CODE,   "ASP active for interface identifer" },
+  { INVALID_PARAMETER_VALUE_ERROR_CODE,               "Invalid parameter value" },
+  { PARAMETER_FIELD_ERROR_CODE,                       "Parameter field error" },
+  { UNEXPECTED_PARAMETER_ERROR_CODE,                  "Unexpected parameter" },
+  { MISSING_PARAMETER_ERROR_CODE,                     "Missing parameter" },
+  { 0,                                                NULL } };
+
+#define ERROR_CODE_LENGTH 4
+#define ERROR_CODE_OFFSET PARAMETER_VALUE_OFFSET
+
+static void
+dissect_m2ua_error_code_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item)
+{
+  guint32 error_code;
+
+  error_code = tvb_get_ntohl(parameter_tvb, ERROR_CODE_OFFSET);
+  proto_tree_add_uint(parameter_tree, hf_m2ua_error_code, parameter_tvb, ERROR_CODE_OFFSET, ERROR_CODE_LENGTH, error_code);
+  proto_item_set_text(parameter_item, "Error code parameter (%s)", val_to_str(error_code, m2ua_error_code_values, "unknown"));
+}
+
+#define AS_STATE_CHANGE_TYPE       1
+#define OTHER_TYPE                 2
+
+static const value_string m2ua_status_type_values[] = {
+  { AS_STATE_CHANGE_TYPE,            "Application server state change" },
+  { OTHER_TYPE,                      "Other" },
+  { 0,                           NULL } };
+
+#define RESERVED_INFO              1
+#define AS_INACTIVE_INFO           2
+#define AS_ACTIVE_INFO             3
+#define AS_PENDING_INFO            4
+
+#define INSUFFICIENT_ASP_RES_INFO  1
+#define ALTERNATE_ASP_ACTIVE_INFO  2
+#define ASP_FAILURE_INFO           3
+
+static const value_string m2ua_status_type_info_values[] = {
+  { AS_STATE_CHANGE_TYPE * 256 * 256 + RESERVED_INFO,             "Reserved" },
+  { AS_STATE_CHANGE_TYPE * 256 * 256 + AS_INACTIVE_INFO,          "Application server inactive" },
+  { AS_STATE_CHANGE_TYPE * 256 * 256 + AS_ACTIVE_INFO,            "Application server active" },
+  { AS_STATE_CHANGE_TYPE * 256 * 256 + AS_PENDING_INFO,           "Application server pending" },
+  { OTHER_TYPE           * 256 * 256 + INSUFFICIENT_ASP_RES_INFO, "Insufficient ASP resources active in AS" },
+  { OTHER_TYPE           * 256 * 256 + ALTERNATE_ASP_ACTIVE_INFO, "Alternate ASP active" },
+  { OTHER_TYPE           * 256 * 256 + ASP_FAILURE_INFO,          "ASP Failure" },
+  {0,                           NULL } };
+
+#define STATUS_TYPE_LENGTH 2
+#define STATUS_INFO_LENGTH 2
+
+#define STATUS_TYPE_OFFSET PARAMETER_VALUE_OFFSET
+#define STATUS_INFO_OFFSET (STATUS_TYPE_OFFSET + STATUS_TYPE_LENGTH)
+
+static void
+dissect_m2ua_status_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item)
+{
+  guint16 status_type, status_info;
+
+  status_type = tvb_get_ntohs(parameter_tvb, STATUS_TYPE_OFFSET);
+  status_info = tvb_get_ntohs(parameter_tvb, STATUS_INFO_OFFSET);
+
+  proto_tree_add_uint(parameter_tree, hf_m2ua_status_type, parameter_tvb, STATUS_TYPE_OFFSET, STATUS_TYPE_LENGTH, status_type);
+  proto_tree_add_uint_format(parameter_tree, hf_m2ua_status_info, parameter_tvb, STATUS_INFO_OFFSET, STATUS_INFO_LENGTH, status_info,
+                             "Status info: %s (%u)", val_to_str(status_type * 256 * 256 + status_info, m2ua_status_type_info_values, "unknown"), status_info);
+
+  proto_item_set_text(parameter_item, 
+                      "Status type / ID (%s)", val_to_str(status_type * 256 * 256 + status_info, m2ua_status_type_info_values, "unknown status information"));
+}
+
+#define ASP_IDENTIFIER_OFFSET PARAMETER_VALUE_OFFSET
+#define ASP_IDENTIFIER_LENGTH  4
+
+static void
+dissect_m2ua_asp_identifier_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item)
+{
+  guint32 id;
+  
+  id = tvb_get_ntohl(parameter_tvb, ASP_IDENTIFIER_OFFSET);
+  proto_tree_add_uint(parameter_tree, hf_m2ua_asp_id, parameter_tvb, ASP_IDENTIFIER_OFFSET, ASP_IDENTIFIER_LENGTH, id);
+  proto_item_set_text(parameter_item, "ASP identifier (%u)", id);
+}
+
+#define CORRELATION_ID_LENGTH 4
+#define CORRELATION_ID_OFFSET PARAMETER_VALUE_OFFSET
+
+static void
+dissect_m2ua_correlation_identifier_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item)
+{
+  guint32 id;
+
+  id = tvb_get_ntohl(parameter_tvb, CORRELATION_ID_OFFSET);
+  proto_tree_add_uint(parameter_tree, hf_m2ua_correlation_id, parameter_tvb, CORRELATION_ID_OFFSET, CORRELATION_ID_LENGTH, id);
+   
+  proto_item_set_text(parameter_item, "Correlation identifier parameter (%u)", id);
+}
+
+#define DATA_1_MTP3_OFFSET PARAMETER_VALUE_OFFSET
+
+static void
+dissect_m2ua_protocol_data_1_parameter(tvbuff_t *parameter_tvb, packet_info *pinfo, proto_tree *tree, proto_tree *parameter_tree, proto_item *parameter_item)
+{
+  tvbuff_t *payload_tvb;
+  guint32 payload_length;
+
+  payload_length = tvb_length(parameter_tvb) - PARAMETER_HEADER_LENGTH;
+
+  payload_tvb = tvb_new_subset(parameter_tvb, DATA_1_MTP3_OFFSET, payload_length, payload_length);
+  proto_item_set_len(parameter_item, PARAMETER_HEADER_LENGTH);
+  call_dissector(mtp3_handle, payload_tvb, pinfo, tree);
+
+  proto_item_set_text(parameter_item, "Data 1 parameter");
+}
+
+#define DATA_2_LI_LENGTH   1
+#define DATA_2_LI_OFFSET   PARAMETER_VALUE_OFFSET
+#define DATA_2_MTP3_OFFSET (DATA_2_LI_OFFSET + DATA_2_LI_LENGTH)
+
+static void
+dissect_m2ua_protocol_data_2_parameter(tvbuff_t *parameter_tvb, packet_info *pinfo, proto_tree *tree, proto_tree *parameter_tree, proto_item *parameter_item)
+{
+  tvbuff_t *payload_tvb;
+  guint32 payload_length;
+  guint8  li;
+  
+  payload_length = tvb_length(parameter_tvb) - PARAMETER_HEADER_LENGTH - DATA_2_LI_LENGTH;
+  li = tvb_get_guint8(parameter_tvb, DATA_2_LI_OFFSET);
+  
+  proto_tree_add_uint(parameter_tree, hf_m2ua_data_2_li, parameter_tvb, DATA_2_LI_OFFSET, DATA_2_LI_LENGTH, li);
+  payload_tvb = tvb_new_subset(parameter_tvb, DATA_2_MTP3_OFFSET, payload_length, payload_length);
+  proto_item_set_len(parameter_item, PARAMETER_HEADER_LENGTH + DATA_2_LI_LENGTH);
+  call_dissector(mtp3_handle, payload_tvb, pinfo, tree);
+
+  proto_item_set_text(parameter_item, "Data 2 parameter");
+}
+
+
+#define STATUS_LPO_SET          0x0
+#define STATUS_LPO_CLEAR        0x1
+#define STATUS_EMER_SET         0x2
+#define STATUS_EMER_CLEAR       0x3
+#define STATUS_FLUSH_BUFFERS    0x4
+#define STATUS_CONTINUE         0x5
+#define STATUS_CLEAR_RTB        0x6
+#define STATUS_AUDIT            0x7
+#define STATUS_CONG_CLEAR       0x8
+#define STATUS_CONG_ACCEPT      0x9
+#define STATUS_CONG_DISCARD     0xa
+
+static const value_string m2ua_state_values[] = {
+  { STATUS_LPO_SET,        "Request local processor outage" },
+  { STATUS_LPO_CLEAR,      "Request local processor outage recovered" },
+  { STATUS_EMER_SET,       "Request emergency alignment" },
+  { STATUS_EMER_CLEAR,     "Request normal alignment (cancel emergency)" },
+  { STATUS_FLUSH_BUFFERS,  "Flush or clear receive, transmit and retransmit queues" },
+  { STATUS_CONTINUE,       "Continue or Resume" },
+  { STATUS_CLEAR_RTB,      "Clear the retransmit queue" },
+  { STATUS_AUDIT,          "Audit state of link" },
+  { STATUS_CONG_CLEAR,     "Congestion cleared" },
+  { STATUS_CONG_ACCEPT,    "Congestion accept" },
+  { STATUS_CONG_DISCARD,   "Congestion discard" },
+  {0,                       NULL } };
+  
+#define STATE_LENGTH 4
+#define STATE_OFFSET PARAMETER_VALUE_OFFSET
+
+static void
+dissect_m2ua_state_request_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item)
+{
+  guint32 state;
+
+  state = tvb_get_ntohl(parameter_tvb, STATE_OFFSET);
+  proto_tree_add_uint(parameter_tree, hf_m2ua_state, parameter_tvb, STATE_OFFSET, STATE_LENGTH, state);
+   
+  proto_item_set_text(parameter_item, "State request parameter (%s)", val_to_str(state, m2ua_state_values, "unknown"));
+}
+
+#define EVENT_RPO_ENTER        0x1
+#define EVENT_RPO_EXIT         0x2
+#define EVENT_LPO_ENTER        0x3
+#define EVENT_LPO_EXIT         0x4
+
+static const value_string m2ua_event_values[] = {
+  { EVENT_RPO_ENTER, "Remote entered processor outage" },
+  { EVENT_RPO_EXIT,  "Remote exited processor outage" },
+  { EVENT_LPO_ENTER, "Link entered processor outage" },
+  { EVENT_LPO_EXIT,  "Link exited processor outage" },
+  {0,                NULL } };
+
+#define EVENT_LENGTH 4
+#define EVENT_OFFSET PARAMETER_VALUE_OFFSET
+
+static void
+dissect_m2ua_event_request_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item)
+{
+  guint32 event;
+
+  event = tvb_get_ntohl(parameter_tvb, STATE_OFFSET);
+  proto_tree_add_uint(parameter_tree, hf_m2ua_event, parameter_tvb, EVENT_OFFSET, EVENT_LENGTH, event);
+   
+  proto_item_set_text(parameter_item, "State event parameter (%s)", val_to_str(event, m2ua_event_values, "unknown"));
+}
+
+#define LEVEL_NONE       0x0
+#define LEVEL_1          0x1
+#define LEVEL_2          0x2
+#define LEVEL_3          0x3
+
+static const value_string m2ua_level_values[] = {
+  { LEVEL_NONE, "No congestion" },
+  { LEVEL_1,    "Congestion Level 1" },
+  { LEVEL_2,    "Congestion Level 2" },
+  { LEVEL_3,    "Congestion Level 3" },
+  {0,           NULL } };
+
+#define CONGESTION_STATUS_LENGTH 4
+#define CONGESTION_STATUS_OFFSET PARAMETER_VALUE_OFFSET
+
+static void
+dissect_m2ua_congestion_status_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item)
+{
+  guint32 status;
+
+  status = tvb_get_ntohl(parameter_tvb, CONGESTION_STATUS_OFFSET);
+  proto_tree_add_uint(parameter_tree, hf_m2ua_congestion_status, parameter_tvb, CONGESTION_STATUS_OFFSET, CONGESTION_STATUS_LENGTH, status);
+   
+  proto_item_set_text(parameter_item, "Congestion status parameter (%s)", val_to_str(status, m2ua_level_values, "unknown"));
+}
+
+#define DISCARD_STATUS_LENGTH 4
+#define DISCARD_STATUS_OFFSET PARAMETER_VALUE_OFFSET
+
+static void
+dissect_m2ua_discard_status_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item)
+{
+  guint32 status;
+
+  status = tvb_get_ntohl(parameter_tvb, DISCARD_STATUS_OFFSET);
+  proto_tree_add_uint(parameter_tree, hf_m2ua_discard_status, parameter_tvb, DISCARD_STATUS_OFFSET, DISCARD_STATUS_LENGTH, status);
+   
+  proto_item_set_text(parameter_item, "Discard status parameter (%s)", val_to_str(status, m2ua_level_values, "unknown"));
+}
+
+#define ACTION_RTRV_BSN      0x1
+#define ACTION_RTRV_MSGS     0x2
+
+static const value_string m2ua_action_values[] = {
+  { ACTION_RTRV_BSN,  "Retrieve the backward sequence number" },
+  { ACTION_RTRV_MSGS, "Retrieve the PDUs from the transmit and retransmit queues" },
+  {0,                  NULL } };
+
+
+#define ACTION_LENGTH 4
+#define ACTION_OFFSET PARAMETER_VALUE_OFFSET
+
+static void
+dissect_m2ua_action_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item)
+{
+  guint32 action;
+
+  action = tvb_get_ntohl(parameter_tvb, ACTION_OFFSET);
+  proto_tree_add_uint(parameter_tree, hf_m2ua_action, parameter_tvb, ACTION_OFFSET, ACTION_LENGTH, action);
+   
+  proto_item_set_text(parameter_item, "Action parameter (%s)", val_to_str(action, m2ua_action_values, "unknown"));
+}
+
+#define SEQUENCE_NUMBER_LENGTH 4
+#define SEQUENCE_NUMBER_OFFSET PARAMETER_VALUE_OFFSET
+
+static void
+dissect_m2ua_sequence_number_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item)
+{
+  guint32 number;
+
+  number = tvb_get_ntohl(parameter_tvb, SEQUENCE_NUMBER_OFFSET);
+  proto_tree_add_uint(parameter_tree, hf_m2ua_sequence_number, parameter_tvb, SEQUENCE_NUMBER_OFFSET, SEQUENCE_NUMBER_LENGTH, number);
+   
+  proto_item_set_text(parameter_item, "Sequence number parameter (%u)", number);
+}
+
+#define RESULT_SUCCESS       0x0
+#define RESULT_FAILURE       0x1
+
+static const value_string m2ua_retrieval_result_values[] = {
+  { RESULT_SUCCESS,    "Action successful" },
+  { RESULT_FAILURE ,   "Action failed" },
+  { 0,                  NULL } };
+
+
+#define RETRIEVAL_RESULT_LENGTH 4
+#define RETRIEVAL_RESULT_OFFSET PARAMETER_VALUE_OFFSET
+
+static void
+dissect_m2ua_retrieval_result_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item)
+{
+  guint32 result;
+
+  result = tvb_get_ntohl(parameter_tvb, RETRIEVAL_RESULT_OFFSET);
+  proto_tree_add_uint(parameter_tree, hf_m2ua_retrieval_result, parameter_tvb, RETRIEVAL_RESULT_OFFSET, RETRIEVAL_RESULT_LENGTH, result);
+   
+  proto_item_set_text(parameter_item, "Retrieval result parameter (%s)",  val_to_str(result, m2ua_retrieval_result_values, "unknown"));
+}
+
+static void
+dissect_m2ua_link_key_parameter(tvbuff_t *parameter_tvb, packet_info *pinfo, proto_tree *tree, proto_tree *parameter_tree, proto_item *parameter_item)
+{
+  tvbuff_t *parameters_tvb;
+  guint16 length, parameters_length;
+  
+  length            = tvb_get_ntohs(parameter_tvb, PARAMETER_LENGTH_OFFSET);
+  parameters_length = length - PARAMETER_HEADER_LENGTH;
+  parameters_tvb    = tvb_new_subset(parameter_tvb, PARAMETER_VALUE_OFFSET, parameters_length, parameters_length);
+  dissect_m2ua_parameters(parameters_tvb, pinfo, tree, parameter_tree);
+  proto_item_set_text(parameter_item, "Link key parameter");
+}
+
+#define LOCAL_LK_ID_LENGTH 4
+#define LOCAL_LK_ID_OFFSET PARAMETER_VALUE_OFFSET
+
+static void
+dissect_m2ua_local_lk_identifier_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item)
+{
+  guint32 id;
+
+  id = tvb_get_ntohl(parameter_tvb, LOCAL_LK_ID_OFFSET);
+  proto_tree_add_uint(parameter_tree, hf_m2ua_local_lk_id, parameter_tvb, LOCAL_LK_ID_OFFSET, LOCAL_LK_ID_LENGTH, id);
+   
+  proto_item_set_text(parameter_item, "Local KL identifier parameter (%u)",  id);
+}
+
+#define SDT_RESERVED_LENGTH 2
+#define SDT_ID_LENGTH       2  
+#define SDT_RESERVED_OFFSET PARAMETER_VALUE_OFFSET
+#define SDT_ID_OFFSET       (SDT_RESERVED_OFFSET + SDT_RESERVED_LENGTH)
+
+static void
+dissect_m2ua_sdt_identifier_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item)
+{
+  guint16 reserved, id;
+
+  reserved = tvb_get_ntohs(parameter_tvb, SDT_RESERVED_OFFSET);
+  id       = tvb_get_ntohs(parameter_tvb, SDT_ID_OFFSET);
+  
+  proto_tree_add_uint(parameter_tree, hf_m2ua_sdt_reserved, parameter_tvb, SDT_RESERVED_OFFSET, SDT_RESERVED_LENGTH, reserved);
+  proto_tree_add_uint(parameter_tree, hf_m2ua_sdt_id, parameter_tvb, SDT_ID_OFFSET, SDT_ID_LENGTH, id);
+
+  proto_item_set_text(parameter_item, "SDT identifier parameter (%u)",  id);
+}
+
+#define SDL_RESERVED_LENGTH 2
+#define SDL_ID_LENGTH       2  
+#define SDL_RESERVED_OFFSET PARAMETER_VALUE_OFFSET
+#define SDL_ID_OFFSET       (SDL_RESERVED_OFFSET + SDL_RESERVED_LENGTH)
+
+static void
+dissect_m2ua_sdl_identifier_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item)
+{
+  guint16 reserved, id;
+
+  reserved = tvb_get_ntohs(parameter_tvb, SDT_RESERVED_OFFSET);
+  id       = tvb_get_ntohs(parameter_tvb, SDT_ID_OFFSET);
+  
+  proto_tree_add_uint(parameter_tree, hf_m2ua_sdl_reserved, parameter_tvb, SDL_RESERVED_OFFSET, SDL_RESERVED_LENGTH, reserved);
+  proto_tree_add_uint(parameter_tree, hf_m2ua_sdl_id, parameter_tvb, SDL_ID_OFFSET, SDL_ID_LENGTH, id);
+
+  proto_item_set_text(parameter_item, "SDL identifier parameter (%u)",  id);
+}
+
+static void
+dissect_m2ua_registration_result_parameter(tvbuff_t *parameter_tvb, packet_info *pinfo, proto_tree *tree, proto_tree *parameter_tree, proto_item *parameter_item)
+{
+  tvbuff_t *parameters_tvb;
+  guint16 length, parameters_length;
+  
+  length            = tvb_get_ntohs(parameter_tvb, PARAMETER_LENGTH_OFFSET);
+  parameters_length = length - PARAMETER_HEADER_LENGTH;
+  parameters_tvb    = tvb_new_subset(parameter_tvb, PARAMETER_VALUE_OFFSET, parameters_length, parameters_length);
+  dissect_m2ua_parameters(parameters_tvb, pinfo, tree, parameter_tree);
+  proto_item_set_text(parameter_item, "Registration result parameter");
+}
+
+#define SUCCESSFULL_REGISTRATION_STATUS               0
+#define UNKNOWN_REGISTRATION_STATUS                   1
+#define INVALID_SDLI_REGISTRATION_STATUS              2
+#define INVALID_SDTI_REGISTRATION_STATUS              3
+#define INVALID_LINK_KEY_REGISTRATION_STATUS          4
+#define PERMISSION_DENIED_REGISTRATION_STATUS         5
+#define OVERLAPPING_LINK_KEY_REGISTRATION_STATUS      6
+#define LINK_KEY_NOT_PROVISIONED_REGISTRATION_STATUS  7
+#define INSUFFICIENT_RESOURCES_REGISTRATION_STATUS    8
+
+static const value_string m2ua_registration_status_values[] = {
+  { SUCCESSFULL_REGISTRATION_STATUS,              "Successfully Registered" },
+  { UNKNOWN_REGISTRATION_STATUS,                  "Error - Unknown" },
+  { INVALID_SDLI_REGISTRATION_STATUS,             "Error - Invalid SDLI" },
+  { INVALID_SDTI_REGISTRATION_STATUS,             "Error - Invalid SDTI" },
+  { INVALID_LINK_KEY_REGISTRATION_STATUS,         "Error - Invalid Link Key" },
+  { PERMISSION_DENIED_REGISTRATION_STATUS,        "Error - Permission Denied" },
+  { OVERLAPPING_LINK_KEY_REGISTRATION_STATUS,     "Error - Overlapping (Non-unique) Link Key" },
+  { LINK_KEY_NOT_PROVISIONED_REGISTRATION_STATUS, "Error - Link Key not Provisioned" },
+  { INSUFFICIENT_RESOURCES_REGISTRATION_STATUS,   "Error - Insufficient Resources" },
+  { 0,                  NULL } };
+
+#define REGISTRATION_STATUS_LENGTH 4
+#define REGISTRATION_STATUS_OFFSET PARAMETER_VALUE_OFFSET
+
+static void
+dissect_m2ua_registration_status_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item)
+{
+  guint32 status;
+
+  status = tvb_get_ntohl(parameter_tvb, REGISTRATION_STATUS_OFFSET);
+  proto_tree_add_uint(parameter_tree, hf_m2ua_registration_status, parameter_tvb, REGISTRATION_STATUS_OFFSET, REGISTRATION_STATUS_LENGTH, status);
+   
+  proto_item_set_text(parameter_item, "Registration status parameter (%s)",  val_to_str(status, m2ua_registration_status_values, "unknown"));
+}
+
+static void
+dissect_m2ua_deregistration_result_parameter(tvbuff_t *parameter_tvb, packet_info *pinfo, proto_tree *tree, proto_tree *parameter_tree, proto_item *parameter_item)
+{
+  tvbuff_t *parameters_tvb;
+  guint16 length, parameters_length;
+  
+  length            = tvb_get_ntohs(parameter_tvb, PARAMETER_LENGTH_OFFSET);
+  parameters_length = length - PARAMETER_HEADER_LENGTH;
+  parameters_tvb    = tvb_new_subset(parameter_tvb, PARAMETER_VALUE_OFFSET, parameters_length, parameters_length);
+  dissect_m2ua_parameters(parameters_tvb, pinfo, tree, parameter_tree);
+  proto_item_set_text(parameter_item, "Deregistration result parameter");
+}
+
+#define SUCCESSFULL_DEREGISTRATION_STATUS                  0
+#define UNKNOWN_DEREGISTRATION_STATUS                      1
+#define INVALID_INTERFACE_IDENTIFIER_DEREGISTRATION_STATUS 2
+#define PERMISSION_DENIED_DEREGISTRATION_STATUS            3
+#define NOT_REGISTRED_DEREGISTRATION_STATUS                4
+
+static const value_string m2ua_deregistration_status_values[] = {
+  { SUCCESSFULL_DEREGISTRATION_STATUS,                  "Successfully Registered" },
+  { UNKNOWN_DEREGISTRATION_STATUS,                      "Error - Unknown" },
+  { INVALID_INTERFACE_IDENTIFIER_DEREGISTRATION_STATUS, "Error - Invalid interface identifier" },
+  { PERMISSION_DENIED_DEREGISTRATION_STATUS,            "Error - Permission Denied" },
+  { NOT_REGISTRED_DEREGISTRATION_STATUS,                "Error - Not registered" },
+  { 0,                                                  NULL } };
+
+#define DEREGISTRATION_STATUS_LENGTH 4
+#define DEREGISTRATION_STATUS_OFFSET PARAMETER_VALUE_OFFSET
+
+static void
+dissect_m2ua_deregistration_status_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item)
+{
+  guint32 status;
+
+  status = tvb_get_ntohl(parameter_tvb, DEREGISTRATION_STATUS_OFFSET);
+  proto_tree_add_uint(parameter_tree, hf_m2ua_deregistration_status, parameter_tvb, DEREGISTRATION_STATUS_OFFSET, DEREGISTRATION_STATUS_LENGTH, status);
+   
+  proto_item_set_text(parameter_item, "Deregistration status parameter (%s)",  val_to_str(status, m2ua_deregistration_status_values, "unknown"));
+}
+
+static void
+dissect_m2ua_unknown_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item)
+{
+  guint16 tag, length, parameter_value_length;
+  
+  tag    = tvb_get_ntohs(parameter_tvb, PARAMETER_TAG_OFFSET);
+  length = tvb_get_ntohs(parameter_tvb, PARAMETER_LENGTH_OFFSET);
+  
+  parameter_value_length = length - PARAMETER_HEADER_LENGTH;
+
+  if (parameter_value_length > 0)
+    proto_tree_add_bytes(parameter_tree, hf_m2ua_parameter_value, parameter_tvb, PARAMETER_VALUE_OFFSET, parameter_value_length, 
+                         tvb_get_ptr(parameter_tvb, PARAMETER_VALUE_OFFSET, parameter_value_length));
+
+  proto_item_set_text(parameter_item, "Parameter with tag %u and %u byte%s value", tag, parameter_value_length, plurality(parameter_value_length, "", "s"));
+}
+
+/* Common parameter tags */
+#define INTERFACE_IDENTIFIER_INT_PARAMETER_TAG     0x0001
+#define INTERFACE_IDENTIFIER_TEXT_PARAMETER_TAG    0x0003
+#define INFO_STRING_PARAMETER_TAG                  0x0004
+#define DIAGNOSTIC_INFORMATION_PARAMETER_TAG       0x0007
+#define INTERFACE_IDENTIFIER_RANGE_PARAMETER_TAG   0x0008
+#define HEARTBEAT_DATA_PARAMETER_TAG               0x0009
+#define TRAFFIC_MODE_TYPE_PARAMETER_TAG            0x000b
+#define ERROR_CODE_PARAMETER_TAG                   0x000c
+#define STATUS_PARAMETER_TAG                       0x000d
+#define ASP_IDENTIFIER_PARAMETER_TAG               0x0011
+#define CORRELATION_IDENTIFIER_PARAMETER_TAG       0x0013
+
+/* M2PA specific parameter tags */
+#define PROTOCOL_DATA_1_PARAMETER_TAG              0x0300
+#define PROTOCOL_DATA_2_PARAMETER_TAG              0x0301
+#define STATE_REQUEST_PARAMETER_TAG                0x0302
+#define STATE_EVENT_PARAMETER_TAG                  0x0303
+#define CONGESTION_STATUS_PARAMETER_TAG            0x0304
+#define DISCARD_STATUS_PARAMETER_TAG               0x0305
+#define ACTION_PARAMETER_TAG                       0x0306
+#define SEQUENCE_NUMBER_PARAMETER_TAG              0x0307
+#define RETRIEVAL_RESULT_PARAMETER_TAG             0x0308
+#define LINK_KEY_PARAMETER_TAG                     0x0309
+#define LOCAL_LK_IDENTIFIER_PARAMETER_TAG          0x030a
+#define SDT_IDENTIFIER_PARAMETER_TAG               0x030b
+#define SDL_IDENTIFIER_PARAMETER_TAG               0x030c
+#define REG_RESULT_PARAMETER_TAG                   0x030d
+#define REG_STATUS_PARAMETER_TAG                   0x030e
+#define DEREG_RESULT_PARAMETER_TAG                 0x030f
+#define DEREG_STATUS_PARAMETER_TAG                 0x0310
+
+static const value_string m2ua_parameter_tag_values[] = {
+  { INTERFACE_IDENTIFIER_INT_PARAMETER_TAG,        "Interface identifier (interger)" },
+  { INTERFACE_IDENTIFIER_TEXT_PARAMETER_TAG,       "Interface identifier (text)" },
+  { INFO_STRING_PARAMETER_TAG,                     "Info string" },
+  { DIAGNOSTIC_INFORMATION_PARAMETER_TAG,          "Diagnostic information" },
+  { INTERFACE_IDENTIFIER_RANGE_PARAMETER_TAG,      "Interface identifier (interger range)" },
+  { HEARTBEAT_DATA_PARAMETER_TAG,                  "Heartbeat data" },
+  { TRAFFIC_MODE_TYPE_PARAMETER_TAG,               "Traffic mode type" },
+  { ERROR_CODE_PARAMETER_TAG,                      "Error code" },
+  { STATUS_PARAMETER_TAG,                          "Status type / information" },
+  { ASP_IDENTIFIER_PARAMETER_TAG,                  "ASP identifier" },
+  { CORRELATION_IDENTIFIER_PARAMETER_TAG,          "Correlation identifier" },
+  { PROTOCOL_DATA_1_PARAMETER_TAG,                 "Protocol data 1" },
+  { PROTOCOL_DATA_2_PARAMETER_TAG,                 "Protocol data 2" },
+  { STATE_REQUEST_PARAMETER_TAG,                   "State request" },
+  { STATE_EVENT_PARAMETER_TAG,                     "State event" },
+  { CONGESTION_STATUS_PARAMETER_TAG,               "Congestion state" },
+  { DISCARD_STATUS_PARAMETER_TAG,                  "Discard state" },
+  { ACTION_PARAMETER_TAG,                          "Action" },
+  { SEQUENCE_NUMBER_PARAMETER_TAG,                 "Sequence number" },
+  { RETRIEVAL_RESULT_PARAMETER_TAG,                "Retrieval result" },
+  { LINK_KEY_PARAMETER_TAG,                        "Link key" },
+  { LOCAL_LK_IDENTIFIER_PARAMETER_TAG,             "Local LK identifier" },
+  { SDT_IDENTIFIER_PARAMETER_TAG,                  "SDT identifier" },
+  { SDL_IDENTIFIER_PARAMETER_TAG,                  "SDL identifer" },
+  { REG_RESULT_PARAMETER_TAG,                      "Registration result" },
+  { REG_STATUS_PARAMETER_TAG,                      "Registration status" },
+  { DEREG_RESULT_PARAMETER_TAG,                    "Deregistration result" },
+  { DEREG_STATUS_PARAMETER_TAG,                    "Deregistration status" },
+  { 0,                           NULL } };
+
+static void
+dissect_m2ua_parameter(tvbuff_t *parameter_tvb, packet_info *pinfo, proto_tree *tree, proto_tree *m2ua_tree)
+{
+  guint16 tag, length, padding_length, total_length;
+  proto_item *parameter_item;
+  proto_tree *parameter_tree;
+
+  /* extract tag and length from the parameter */
+  tag            = tvb_get_ntohs(parameter_tvb, PARAMETER_TAG_OFFSET);
+  length         = tvb_get_ntohs(parameter_tvb, PARAMETER_LENGTH_OFFSET);
+
+  /* calculate padding and total length */
+  padding_length = tvb_length(parameter_tvb) - length;
+  total_length   = length + padding_length;
+
+  /* create proto_tree stuff */
+  parameter_item   = proto_tree_add_text(m2ua_tree, parameter_tvb, PARAMETER_HEADER_OFFSET, total_length, "Incomplete parameter");
+  parameter_tree   = proto_item_add_subtree(parameter_item, ett_m2ua_parameter);
+
+  /* add tag and length to the m2ua tree */
+  proto_tree_add_uint(parameter_tree, hf_m2ua_parameter_tag, parameter_tvb, PARAMETER_TAG_OFFSET, PARAMETER_TAG_LENGTH, tag);
+  proto_tree_add_uint(parameter_tree, hf_m2ua_parameter_length, parameter_tvb, PARAMETER_LENGTH_OFFSET, PARAMETER_LENGTH_LENGTH, length);
+
+  switch(tag) {
+  case INTERFACE_IDENTIFIER_INT_PARAMETER_TAG:
+    dissect_m2ua_interface_identifier_int_parameter(parameter_tvb, parameter_tree, parameter_item);
+    break;
+  case INTERFACE_IDENTIFIER_TEXT_PARAMETER_TAG:
+    dissect_m2ua_interface_identifier_text_parameter(parameter_tvb, parameter_tree, parameter_item);
+    break;
+  case INFO_STRING_PARAMETER_TAG:
+    dissect_m2ua_info_string_parameter(parameter_tvb, parameter_tree, parameter_item);
+    break;
+  case DIAGNOSTIC_INFORMATION_PARAMETER_TAG:
+    dissect_m2ua_diagnostic_information_parameter(parameter_tvb, parameter_tree, parameter_item);
+    break;
+  case INTERFACE_IDENTIFIER_RANGE_PARAMETER_TAG:
+    dissect_m2ua_interface_identifier_range_parameter(parameter_tvb, parameter_tree, parameter_item);
+    break;
+  case HEARTBEAT_DATA_PARAMETER_TAG:
+    dissect_m2ua_heartbeat_data_parameter(parameter_tvb, parameter_tree, parameter_item);
+    break;
+  case TRAFFIC_MODE_TYPE_PARAMETER_TAG:
+    dissect_m2ua_traffic_mode_type_parameter(parameter_tvb, parameter_tree, parameter_item);
+    break;
+  case ERROR_CODE_PARAMETER_TAG:
+    dissect_m2ua_error_code_parameter(parameter_tvb, parameter_tree, parameter_item);
+    break;
+  case STATUS_PARAMETER_TAG:
+    dissect_m2ua_status_parameter(parameter_tvb, parameter_tree, parameter_item);
+    break;
+  case ASP_IDENTIFIER_PARAMETER_TAG:
+    dissect_m2ua_asp_identifier_parameter(parameter_tvb, parameter_tree, parameter_item);
+    break;
+  case CORRELATION_IDENTIFIER_PARAMETER_TAG:
+    dissect_m2ua_correlation_identifier_parameter(parameter_tvb, parameter_tree, parameter_item);
+    break;
+  case PROTOCOL_DATA_1_PARAMETER_TAG:
+    dissect_m2ua_protocol_data_1_parameter(parameter_tvb, pinfo, tree, parameter_tree, parameter_item);
+    break;
+  case PROTOCOL_DATA_2_PARAMETER_TAG:
+    dissect_m2ua_protocol_data_2_parameter(parameter_tvb, pinfo, tree, parameter_tree, parameter_item);
+    break;
+  case STATE_REQUEST_PARAMETER_TAG:
+    dissect_m2ua_state_request_parameter(parameter_tvb, parameter_tree, parameter_item);
+    break;
+  case STATE_EVENT_PARAMETER_TAG:
+    dissect_m2ua_event_request_parameter(parameter_tvb, parameter_tree, parameter_item);
+    break;
+  case CONGESTION_STATUS_PARAMETER_TAG:
+    dissect_m2ua_congestion_status_parameter(parameter_tvb, parameter_tree, parameter_item);
+    break;
+  case DISCARD_STATUS_PARAMETER_TAG:
+    dissect_m2ua_discard_status_parameter(parameter_tvb, parameter_tree, parameter_item);
+    break;
+  case ACTION_PARAMETER_TAG:
+    dissect_m2ua_action_parameter(parameter_tvb, parameter_tree, parameter_item);
+    break;
+  case SEQUENCE_NUMBER_PARAMETER_TAG:
+    dissect_m2ua_sequence_number_parameter(parameter_tvb, parameter_tree, parameter_item);
+    break;
+  case RETRIEVAL_RESULT_PARAMETER_TAG:
+    dissect_m2ua_retrieval_result_parameter(parameter_tvb, parameter_tree, parameter_item);
+    break;
+  case LINK_KEY_PARAMETER_TAG:
+    dissect_m2ua_link_key_parameter(parameter_tvb, pinfo, tree, parameter_tree, parameter_item);
+    break;
+  case LOCAL_LK_IDENTIFIER_PARAMETER_TAG:
+    dissect_m2ua_local_lk_identifier_parameter(parameter_tvb, parameter_tree, parameter_item);
+    break;
+  case SDT_IDENTIFIER_PARAMETER_TAG:
+    dissect_m2ua_sdt_identifier_parameter(parameter_tvb, parameter_tree, parameter_item);
+    break;
+  case SDL_IDENTIFIER_PARAMETER_TAG:
+    dissect_m2ua_sdl_identifier_parameter(parameter_tvb, parameter_tree, parameter_item);
+    break;
+  case REG_RESULT_PARAMETER_TAG:
+    dissect_m2ua_registration_result_parameter(parameter_tvb, pinfo, tree, parameter_tree, parameter_item);
+    break;
+  case REG_STATUS_PARAMETER_TAG:
+    dissect_m2ua_registration_status_parameter(parameter_tvb, parameter_tree, parameter_item);
+    break;
+  case DEREG_RESULT_PARAMETER_TAG:
+    dissect_m2ua_deregistration_result_parameter(parameter_tvb, pinfo, tree, parameter_tree, parameter_item);
+    break;
+  case DEREG_STATUS_PARAMETER_TAG:
+    dissect_m2ua_deregistration_status_parameter(parameter_tvb, parameter_tree, parameter_item);
+    break;
+  default:
+    dissect_m2ua_unknown_parameter(parameter_tvb, parameter_tree, parameter_item);
+    break;
+  };
+
+  if (padding_length > 0)
+    proto_tree_add_bytes(parameter_tree, hf_m2ua_parameter_padding, parameter_tvb, PARAMETER_HEADER_OFFSET + length, padding_length, 
+                         tvb_get_ptr(parameter_tvb, PARAMETER_HEADER_OFFSET + length, padding_length));
+}
+
+
+static void
+dissect_m2ua_parameters(tvbuff_t *parameters_tvb, packet_info *pinfo, proto_tree *tree, proto_tree *m2ua_tree)
+{
+  gint offset, length, padding_length, total_length, remaining_length;
+  tvbuff_t *parameter_tvb;
+
+  offset = 0;
+  while((remaining_length = tvb_reported_length_remaining(parameters_tvb, offset))) {
+    length         = tvb_get_ntohs(parameters_tvb, offset + PARAMETER_LENGTH_OFFSET);
+    padding_length = nr_of_padding_bytes(length);
+    if (remaining_length >= length)
+      total_length = MIN(length + padding_length, remaining_length);
+    else
+      total_length = length + padding_length;
+    /* create a tvb for the parameter including the padding bytes */
+    parameter_tvb    = tvb_new_subset(parameters_tvb, offset, total_length, total_length);
+    dissect_m2ua_parameter(parameter_tvb, pinfo, tree, m2ua_tree); 
+    /* get rid of the handled parameter */
+    offset += total_length;
+  }
+}
+
+
+static void
+dissect_m2ua_message(tvbuff_t *message_tvb, packet_info *pinfo, proto_tree *tree, proto_tree *m2ua_tree)
+{
+  tvbuff_t *common_header_tvb, *parameters_tvb;
+
+  common_header_tvb = tvb_new_subset(message_tvb, 0, COMMON_HEADER_LENGTH, COMMON_HEADER_LENGTH);
+  parameters_tvb    = tvb_new_subset(message_tvb, COMMON_HEADER_LENGTH, -1, -1);
+  dissect_m2ua_common_header(common_header_tvb, pinfo, m2ua_tree);  
+  if (m2ua_tree)
+    dissect_m2ua_parameters(parameters_tvb, pinfo, tree, m2ua_tree);
+}
+
+static void
+dissect_m2ua(tvbuff_t *message_tvb, packet_info *pinfo, proto_tree *tree)
+{
+  proto_item *m2ua_item;
+  proto_tree *m2ua_tree;
+
+  /* make entry in the Protocol column on summary display */
+  if (check_col(pinfo->cinfo, COL_PROTOCOL)) 
+    col_set_str(pinfo->cinfo, COL_PROTOCOL, "M2UA");
+  
+  /* 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 m2ua protocol tree */
+    m2ua_item = proto_tree_add_item(tree, proto_m2ua, message_tvb, 0, -1, FALSE);
+    m2ua_tree = proto_item_add_subtree(m2ua_item, ett_m2ua);
+  } else {
+    m2ua_tree = NULL;
+  };
+  /* dissect the message */
+  dissect_m2ua_message(message_tvb, pinfo, tree, m2ua_tree);
+}
+
+/* Register the protocol with Ethereal */
+void
+proto_register_m2ua(void)
+{                 
+
+  /* Setup list of header fields */
+  static hf_register_info hf[] = {
+    { &hf_m2ua_version,
+      { "Version", "m2ua.version",
+	      FT_UINT8, BASE_DEC, VALS(m2ua_protocol_version_values), 0x0,          
+        "", HFILL }
+    },
+    { &hf_m2ua_reserved,
+      { "Reserved", "m2ua.reserved",
+	      FT_UINT8, BASE_HEX, NULL, 0x0,          
+	      "", HFILL }
+    }, 
+    { &hf_m2ua_message_class,
+      { "Message class", "m2ua.message_class",
+        FT_UINT8, BASE_DEC, VALS(m2ua_message_class_values), 0x0,          
+	      "", HFILL }
+    },
+    { &hf_m2ua_message_type,
+      { "Message Type", "m2ua.message_type",
+	      FT_UINT8, BASE_DEC, NULL, 0x0,          
+	      "", HFILL }
+    },
+    { &hf_m2ua_message_length,
+      { "Message length", "m2ua.message_length",
+        FT_UINT32, BASE_DEC, NULL, 0x0,          
+	      "", HFILL }
+    }, 
+    { &hf_m2ua_parameter_tag,
+      { "Parameter Tag", "m2ua.parameter_tag",
+        FT_UINT16, BASE_HEX, VALS(m2ua_parameter_tag_values), 0x0,          
+        "", HFILL }
+    },
+    { &hf_m2ua_parameter_length,
+      { "Parameter length", "m2ua.parameter_length",
+        FT_UINT16, BASE_DEC, NULL, 0x0,          
+	      "", HFILL }
+    }, 
+    { &hf_m2ua_parameter_value,
+      { "Parameter value", "m2ua.parameter_value",
+	      FT_BYTES, BASE_NONE, NULL, 0x0,          
+	      "", HFILL }
+    },    
+    { &hf_m2ua_parameter_padding,
+      { "Padding", "m2ua.parameter_padding",
+	      FT_BYTES, BASE_NONE, NULL, 0x0,          
+	      "", HFILL }
+    },    
+    { &hf_m2ua_interface_id_int,
+      { "Interface Identifier (integer)", "m2ua.interface_identifier_int",
+        FT_UINT32, BASE_DEC, NULL, 0x0,          
+	      "", HFILL }
+    }, 
+    { &hf_m2ua_interface_id_text,
+      { "Interface identifier (text)", "m2ua.interface_identifier_text",
+	      FT_STRING, BASE_DEC, NULL, 0x0,          
+	      "", HFILL }
+    }, 
+    { &hf_m2ua_info_string,
+      { "Info string", "m2ua.info_string",
+	      FT_STRING, BASE_DEC, NULL, 0x0,          
+	      "", HFILL }
+    }, 
+    { &hf_m2ua_diagnostic_information,
+      { "Diagnostic information", "m2ua.diagnostic_information",
+	      FT_BYTES, BASE_NONE, NULL, 0x0,          
+	      "", HFILL }
+    },    
+    { &hf_m2ua_interface_id_start,
+      { "Interface Identifier (start)", "m2ua.interface_identifier_start",
+        FT_UINT32, BASE_DEC, NULL, 0x0,          
+	      "", HFILL }
+    }, 
+    { &hf_m2ua_interface_id_stop,
+      { "Interface Identifier (stop)", "m2ua.interface_identifier_stop",
+        FT_UINT32, BASE_DEC, NULL, 0x0,          
+	      "", HFILL }
+    }, 
+    { &hf_m2ua_heartbeat_data,
+      { "Heartbeat data", "m2ua.heartbeat_data",
+	      FT_BYTES, BASE_NONE, NULL, 0x0,          
+	      "", HFILL }
+    },    
+    { &hf_m2ua_traffic_mode_type,
+      { "Traffic mode Type", "m2ua.traffic_mode_type",
+	      FT_UINT32, BASE_DEC, VALS(m2ua_traffic_mode_type_values), 0x0,          
+	      "", HFILL }
+    }, 
+    { &hf_m2ua_error_code,
+      { "Error code", "m2ua.error_code",
+        FT_UINT32, BASE_DEC, VALS(m2ua_error_code_values), 0x0,          
+	      "", HFILL }
+    }, 
+    { &hf_m2ua_status_type,
+      { "Status type", "m2ua.status_type",
+	      FT_UINT16, BASE_DEC, VALS(m2ua_status_type_values), 0x0,          
+	      "", HFILL }
+    }, 
+    { &hf_m2ua_status_info,
+      { "Status info", "m2ua.status_info",
+	      FT_UINT16, BASE_DEC, NULL, 0x0,          
+	      "", HFILL }
+    }, 
+    { &hf_m2ua_asp_id,
+      { "ASP identifier", "m2ua.asp_identifier",
+	      FT_UINT32, BASE_DEC, NULL, 0x0,          
+	      "", HFILL }
+    },    
+    { &hf_m2ua_correlation_id,
+      { "Correlation identifier", "m2ua.correlation identifier",
+	      FT_UINT32, BASE_DEC, NULL, 0x0,          
+	      "", HFILL }
+    }, 
+    { &hf_m2ua_data_2_li,
+      { "Length indicator", "m2ua.data_2_li",
+        FT_UINT8, BASE_DEC, NULL, 0x0,          
+        "", HFILL }
+    },
+    { &hf_m2ua_state,
+      { "State", "m2ua.state",
+        FT_UINT32, BASE_DEC, VALS(m2ua_state_values), 0x0,          
+        "", HFILL }
+    },
+    { &hf_m2ua_event,
+      { "Event", "m2ua.event",
+        FT_UINT32, BASE_DEC, VALS(m2ua_event_values), 0x0,          
+        "", HFILL }
+    },
+    { &hf_m2ua_congestion_status,
+      { "Congestion status", "m2ua.congestion_status",
+        FT_UINT32, BASE_DEC, VALS(m2ua_level_values), 0x0,          
+        "", HFILL }
+    },
+    { &hf_m2ua_discard_status,
+      { "Discard status", "m2ua.discard_status",
+        FT_UINT32, BASE_DEC, VALS(m2ua_level_values), 0x0,          
+        "", HFILL }
+    },
+    { &hf_m2ua_action,
+      { "Actions", "m2ua.action",
+        FT_UINT32, BASE_DEC, VALS(m2ua_action_values), 0x0,          
+        "", HFILL }
+    },
+    { &hf_m2ua_sequence_number,
+      { "Sequence number", "m2ua.sequence_number",
+        FT_UINT32, BASE_DEC, NULL, 0x0,          
+        "", HFILL }
+    },
+    { &hf_m2ua_retrieval_result,
+      { "Retrieval result", "m2ua.retrieval_result",
+        FT_UINT32, BASE_DEC, VALS(m2ua_retrieval_result_values), 0x0,          
+        "", HFILL }
+    },
+    { &hf_m2ua_local_lk_id,
+      { "Local LK identifier", "m2ua.local_lk_identifier",
+        FT_UINT32, BASE_DEC, NULL, 0x0,          
+        "", HFILL }
+    },
+    { &hf_m2ua_sdt_reserved,
+      { "Reserved", "m2ua.sdt_reserved",
+        FT_UINT16, BASE_HEX, NULL, 0x0,          
+        "", HFILL }
+    },
+    { &hf_m2ua_sdt_id,
+      { "SDT identifier", "m2ua.sdt_identifier",
+        FT_UINT16, BASE_DEC, NULL, 0x0,          
+        "", HFILL }
+    },
+    { &hf_m2ua_sdl_reserved,
+      { "Reserved", "m2ua.sdl_reserved",
+        FT_UINT16, BASE_HEX, NULL, 0x0,          
+        "", HFILL }
+    },
+    { &hf_m2ua_sdl_id,
+      { "SDL identifier", "m2ua.sdl_identifier",
+        FT_UINT16, BASE_DEC, NULL, 0x0,          
+        "", HFILL }
+    },
+    { &hf_m2ua_registration_status,
+      { "Registration status", "m2ua.registration_status",
+        FT_UINT32, BASE_DEC, VALS(m2ua_registration_status_values), 0x0,          
+        "", HFILL }
+    },
+    { &hf_m2ua_deregistration_status,
+      { "Deregistration status", "m2ua.deregistration_status",
+        FT_UINT32, BASE_DEC, VALS(m2ua_deregistration_status_values), 0x0,          
+        "", HFILL }
+    },
+  };
+  
+  /* Setup protocol subtree array */
+  static gint *ett[] = {
+    &ett_m2ua,
+    &ett_m2ua_parameter,
+  };
+  
+  /* Register the protocol name and description */
+  proto_m2ua = proto_register_protocol("MTP 2 User Adaptation Layer", "M2UA",  "m2ua");
+
+  /* Required function calls to register the header fields and subtrees used */
+  proto_register_field_array(proto_m2ua, hf, array_length(hf));
+  proto_register_subtree_array(ett, array_length(ett));
+
+};
+
+void
+proto_reg_handoff_m2ua(void)
+{
+  dissector_handle_t m2ua_handle;
+  
+  mtp3_handle = find_dissector("mtp3");
+  m2ua_handle = create_dissector_handle(dissect_m2ua, proto_m2ua);
+  dissector_add("sctp.ppi",  M2UA_PAYLOAD_PROTO_ID, m2ua_handle);
+  dissector_add("sctp.port", SCTP_PORT_M2UA, m2ua_handle);
+}