print-m3ua.c - platform/external/tcpdump - Git at Google

 /* Copyright (c) 2013, The TCPDUMP project
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
  *
  * 1. Redistributions of source code must retain the above copyright notice, this
  *    list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright notice,
  *    this list of conditions and the following disclaimer in the documentation
  *    and/or other materials provided with the distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
  * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */

 #ifdef HAVE_CONFIG_H
 #include "config.h"
 #endif

 #include <netdissect-stdinc.h>

 #include "netdissect.h"
 #include "extract.h"

 static const char tstr[] = " [|m3ua]";

 /* RFC 4666 */

 #define M3UA_REL_1_0 1

 struct m3ua_common_header {
   uint8_t  v;
   uint8_t  reserved;
   uint8_t  msg_class;
   uint8_t  msg_type;
   uint32_t len;
 };

 struct m3ua_param_header {
   uint16_t tag;
   uint16_t len;
 };

 /* message classes */
 #define M3UA_MSGC_MGMT 0
 #define M3UA_MSGC_TRANSFER 1
 #define M3UA_MSGC_SSNM 2
 #define M3UA_MSGC_ASPSM 3
 #define M3UA_MSGC_ASPTM 4
 /* reserved values */
 #define M3UA_MSGC_RKM 9

 static const struct tok MessageClasses[] = {
 	{ M3UA_MSGC_MGMT,     "Management"            },
 	{ M3UA_MSGC_TRANSFER, "Transfer"              },
 	{ M3UA_MSGC_SSNM,     "SS7"                   },
 	{ M3UA_MSGC_ASPSM,    "ASP"                   },
 	{ M3UA_MSGC_ASPTM,    "ASP"                   },
 	{ M3UA_MSGC_RKM,      "Routing Key Managment" },
 	{ 0, NULL }
 };

 /* management messages */
 #define M3UA_MGMT_ERROR 0
 #define M3UA_MGMT_NOTIFY 1

 static const struct tok MgmtMessages[] = {
   { M3UA_MGMT_ERROR, "Error" },
   { M3UA_MGMT_NOTIFY, "Notify" },
   { 0, NULL }
 };

 /* transfer messages */
 #define M3UA_TRANSFER_DATA 1

 static const struct tok TransferMessages[] = {
   { M3UA_TRANSFER_DATA, "Data" },
   { 0, NULL }
 };

 /* SS7 Signaling Network Management messages */
 #define M3UA_SSNM_DUNA 1
 #define M3UA_SSNM_DAVA 2
 #define M3UA_SSNM_DAUD 3
 #define M3UA_SSNM_SCON 4
 #define M3UA_SSNM_DUPU 5
 #define M3UA_SSNM_DRST 6

 static const struct tok SS7Messages[] = {
   { M3UA_SSNM_DUNA, "Destination Unavailable" },
   { M3UA_SSNM_DAVA, "Destination Available" },
   { M3UA_SSNM_DAUD, "Destination State Audit" },
   { M3UA_SSNM_SCON, "Signalling Congestion" },
   { M3UA_SSNM_DUPU, "Destination User Part Unavailable" },
   { M3UA_SSNM_DRST, "Destination Restricted" },
   { 0, NULL }
 };

 /* ASP State Maintenance messages */
 #define M3UA_ASP_UP 1
 #define M3UA_ASP_DN 2
 #define M3UA_ASP_BEAT 3
 #define M3UA_ASP_UP_ACK 4
 #define M3UA_ASP_DN_ACK 5
 #define M3UA_ASP_BEAT_ACK 6

 static const struct tok ASPStateMessages[] = {
   { M3UA_ASP_UP, "Up" },
   { M3UA_ASP_DN, "Down" },
   { M3UA_ASP_BEAT, "Heartbeat" },
   { M3UA_ASP_UP_ACK, "Up Acknowledgement" },
   { M3UA_ASP_DN_ACK, "Down Acknowledgement" },
   { M3UA_ASP_BEAT_ACK, "Heartbeat Acknowledgement" },
   { 0, NULL }
 };

 /* ASP Traffic Maintenance messages */
 #define M3UA_ASP_AC 1
 #define M3UA_ASP_IA 2
 #define M3UA_ASP_AC_ACK 3
 #define M3UA_ASP_IA_ACK 4

 static const struct tok ASPTrafficMessages[] = {
   { M3UA_ASP_AC, "Active" },
   { M3UA_ASP_IA, "Inactive" },
   { M3UA_ASP_AC_ACK, "Active Acknowledgement" },
   { M3UA_ASP_IA_ACK, "Inactive Acknowledgement" },
   { 0, NULL }
 };

 /* Routing Key Management messages */
 #define M3UA_RKM_REQ 1
 #define M3UA_RKM_RSP 2
 #define M3UA_RKM_DEREQ 3
 #define M3UA_RKM_DERSP 4

 static const struct tok RoutingKeyMgmtMessages[] = {
   { M3UA_RKM_REQ, "Registration Request" },
   { M3UA_RKM_RSP, "Registration Response" },
   { M3UA_RKM_DEREQ, "Deregistration Request" },
   { M3UA_RKM_DERSP, "Deregistration Response" },
   { 0, NULL }
 };

 /* M3UA Parameters */
 #define M3UA_PARAM_INFO 0x0004
 #define M3UA_PARAM_ROUTING_CTX 0x0006
 #define M3UA_PARAM_DIAGNOSTIC 0x0007
 #define M3UA_PARAM_HB_DATA 0x0009
 #define M3UA_PARAM_TRAFFIC_MODE_TYPE 0x000b
 #define M3UA_PARAM_ERROR_CODE 0x000c
 #define M3UA_PARAM_STATUS 0x000d
 #define M3UA_PARAM_ASP_ID 0x0011
 #define M3UA_PARAM_AFFECTED_POINT_CODE 0x0012
 #define M3UA_PARAM_CORR_ID 0x0013

 #define M3UA_PARAM_NETWORK_APPEARANCE 0x0200
 #define M3UA_PARAM_USER 0x0204
 #define M3UA_PARAM_CONGESTION_INDICATION 0x0205
 #define M3UA_PARAM_CONCERNED_DST 0x0206
 #define M3UA_PARAM_ROUTING_KEY 0x0207
 #define M3UA_PARAM_REG_RESULT 0x0208
 #define M3UA_PARAM_DEREG_RESULT 0x0209
 #define M3UA_PARAM_LOCAL_ROUTING_KEY_ID 0x020a
 #define M3UA_PARAM_DST_POINT_CODE 0x020b
 #define M3UA_PARAM_SI 0x020c
 #define M3UA_PARAM_ORIGIN_POINT_CODE_LIST 0x020e
 #define M3UA_PARAM_PROTO_DATA 0x0210
 #define M3UA_PARAM_REG_STATUS 0x0212
 #define M3UA_PARAM_DEREG_STATUS 0x0213

 static const struct tok ParamName[] = {
   { M3UA_PARAM_INFO, "INFO String" },
   { M3UA_PARAM_ROUTING_CTX, "Routing Context" },
   { M3UA_PARAM_DIAGNOSTIC, "Diagnostic Info" },
   { M3UA_PARAM_HB_DATA, "Heartbeat Data" },
   { M3UA_PARAM_TRAFFIC_MODE_TYPE, "Traffic Mode Type" },
   { M3UA_PARAM_ERROR_CODE, "Error Code" },
   { M3UA_PARAM_STATUS, "Status" },
   { M3UA_PARAM_ASP_ID, "ASP Identifier" },
   { M3UA_PARAM_AFFECTED_POINT_CODE, "Affected Point Code" },
   { M3UA_PARAM_CORR_ID, "Correlation ID" },
   { M3UA_PARAM_NETWORK_APPEARANCE, "Network Appearance" },
   { M3UA_PARAM_USER, "User/Cause" },
   { M3UA_PARAM_CONGESTION_INDICATION, "Congestion Indications" },
   { M3UA_PARAM_CONCERNED_DST, "Concerned Destination" },
   { M3UA_PARAM_ROUTING_KEY, "Routing Key" },
   { M3UA_PARAM_REG_RESULT, "Registration Result" },
   { M3UA_PARAM_DEREG_RESULT, "Deregistration Result" },
   { M3UA_PARAM_LOCAL_ROUTING_KEY_ID, "Local Routing Key Identifier" },
   { M3UA_PARAM_DST_POINT_CODE, "Destination Point Code" },
   { M3UA_PARAM_SI, "Service Indicators" },
   { M3UA_PARAM_ORIGIN_POINT_CODE_LIST, "Originating Point Code List" },
   { M3UA_PARAM_PROTO_DATA, "Protocol Data" },
   { M3UA_PARAM_REG_STATUS, "Registration Status" },
   { M3UA_PARAM_DEREG_STATUS, "Deregistration Status" },
   { 0, NULL }
 };

 static void
 tag_value_print(netdissect_options *ndo,
                 const u_char *buf, const uint16_t tag, const uint16_t size)
 {
   switch (tag) {
   case M3UA_PARAM_NETWORK_APPEARANCE:
   case M3UA_PARAM_ROUTING_CTX:
   case M3UA_PARAM_CORR_ID:
     /* buf and size don't include the header */
     if (size < 4)
       goto invalid;
     ND_TCHECK2(*buf, size);
     ND_PRINT((ndo, "0x%08x", EXTRACT_32BITS(buf)));
     break;
   /* ... */
   default:
     ND_PRINT((ndo, "(length %u)", size + (u_int)sizeof(struct m3ua_param_header)));
     ND_TCHECK2(*buf, size);
   }
   return;

 invalid:
   ND_PRINT((ndo, "%s", istr));
   ND_TCHECK2(*buf, size);
   return;
 trunc:
   ND_PRINT((ndo, "%s", tstr));
 }

 /*
  *     0                   1                   2                   3
  *     0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  *    |          Parameter Tag        |       Parameter Length        |
  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  *    \                                                               \
  *    /                       Parameter Value                         /
  *    \                                                               \
  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  */
 static void
 m3ua_tags_print(netdissect_options *ndo,
                 const u_char *buf, const u_int size)
 {
   const u_char *p = buf;
   int align;
   uint16_t hdr_tag;
   uint16_t hdr_len;

   while (p < buf + size) {
     if (p + sizeof(struct m3ua_param_header) > buf + size)
       goto invalid;
     ND_TCHECK2(*p, sizeof(struct m3ua_param_header));
     /* Parameter Tag */
     hdr_tag = EXTRACT_16BITS(p);
     ND_PRINT((ndo, "\n\t\t\t%s: ", tok2str(ParamName, "Unknown Parameter (0x%04x)", hdr_tag)));
     /* Parameter Length */
     hdr_len = EXTRACT_16BITS(p + 2);
     if (hdr_len < sizeof(struct m3ua_param_header))
       goto invalid;
     /* Parameter Value */
     align = (p + hdr_len - buf) % 4;
     align = align ? 4 - align : 0;
     ND_TCHECK2(*p, hdr_len + align);
     tag_value_print(ndo, p, hdr_tag, hdr_len - sizeof(struct m3ua_param_header));
     p += hdr_len + align;
   }
   return;

 invalid:
   ND_PRINT((ndo, "%s", istr));
   ND_TCHECK2(*buf, size);
   return;
 trunc:
   ND_PRINT((ndo, "%s", tstr));
 }

 /*
  *     0                   1                   2                   3
  *     0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  *    |    Version    |   Reserved    | Message Class | Message Type  |
  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  *    |                        Message Length                         |
  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  *    \                                                               \
  *    /                                                               /
  */
 void
 m3ua_print(netdissect_options *ndo,
            const u_char *buf, const u_int size)
 {
   const struct m3ua_common_header *hdr = (const struct m3ua_common_header *) buf;
   const struct tok *dict;

   /* size includes the header */
   if (size < sizeof(struct m3ua_common_header))
     goto invalid;
   ND_TCHECK(*hdr);
   if (hdr->v != M3UA_REL_1_0)
     return;

   dict =
     hdr->msg_class == M3UA_MSGC_MGMT     ? MgmtMessages :
     hdr->msg_class == M3UA_MSGC_TRANSFER ? TransferMessages :
     hdr->msg_class == M3UA_MSGC_SSNM     ? SS7Messages :
     hdr->msg_class == M3UA_MSGC_ASPSM    ? ASPStateMessages :
     hdr->msg_class == M3UA_MSGC_ASPTM    ? ASPTrafficMessages :
     hdr->msg_class == M3UA_MSGC_RKM      ? RoutingKeyMgmtMessages :
     NULL;

   ND_PRINT((ndo, "\n\t\t%s", tok2str(MessageClasses, "Unknown message class %i", hdr->msg_class)));
   if (dict != NULL)
     ND_PRINT((ndo, " %s Message", tok2str(dict, "Unknown (0x%02x)", hdr->msg_type)));

   if (size != EXTRACT_32BITS(&hdr->len))
     ND_PRINT((ndo, "\n\t\t\t@@@@@@ Corrupted length %u of message @@@@@@", EXTRACT_32BITS(&hdr->len)));
   else
     m3ua_tags_print(ndo, buf + sizeof(struct m3ua_common_header), EXTRACT_32BITS(&hdr->len) - sizeof(struct m3ua_common_header));
   return;

 invalid:
   ND_PRINT((ndo, "%s", istr));
   ND_TCHECK2(*buf, size);
   return;
 trunc:
   ND_PRINT((ndo, "%s", tstr));
 }
	/* Copyright (c) 2013, The TCPDUMP project
	* All rights reserved.
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions are met:
	*
	* 1. Redistributions of source code must retain the above copyright notice, this
	* list of conditions and the following disclaimer.
	* 2. Redistributions in binary form must reproduce the above copyright notice,
	* this list of conditions and the following disclaimer in the documentation
	* and/or other materials provided with the distribution.
	*
	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
	* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
	* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
	* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
	* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
	* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
	* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
	* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	*/

	#ifdef HAVE_CONFIG_H
	#include "config.h"
	#endif

	#include <netdissect-stdinc.h>

	#include "netdissect.h"
	#include "extract.h"

	static const char tstr[] = " [\|m3ua]";

	/* RFC 4666 */

	#define M3UA_REL_1_0 1

	struct m3ua_common_header {
	uint8_t v;
	uint8_t reserved;
	uint8_t msg_class;
	uint8_t msg_type;
	uint32_t len;
	};

	struct m3ua_param_header {
	uint16_t tag;
	uint16_t len;
	};

	/* message classes */
	#define M3UA_MSGC_MGMT 0
	#define M3UA_MSGC_TRANSFER 1
	#define M3UA_MSGC_SSNM 2
	#define M3UA_MSGC_ASPSM 3
	#define M3UA_MSGC_ASPTM 4
	/* reserved values */
	#define M3UA_MSGC_RKM 9

	static const struct tok MessageClasses[] = {
	{ M3UA_MSGC_MGMT, "Management" },
	{ M3UA_MSGC_TRANSFER, "Transfer" },
	{ M3UA_MSGC_SSNM, "SS7" },
	{ M3UA_MSGC_ASPSM, "ASP" },
	{ M3UA_MSGC_ASPTM, "ASP" },
	{ M3UA_MSGC_RKM, "Routing Key Managment" },
	{ 0, NULL }
	};

	/* management messages */
	#define M3UA_MGMT_ERROR 0
	#define M3UA_MGMT_NOTIFY 1

	static const struct tok MgmtMessages[] = {
	{ M3UA_MGMT_ERROR, "Error" },
	{ M3UA_MGMT_NOTIFY, "Notify" },
	{ 0, NULL }
	};

	/* transfer messages */
	#define M3UA_TRANSFER_DATA 1

	static const struct tok TransferMessages[] = {
	{ M3UA_TRANSFER_DATA, "Data" },
	{ 0, NULL }
	};

	/* SS7 Signaling Network Management messages */
	#define M3UA_SSNM_DUNA 1
	#define M3UA_SSNM_DAVA 2
	#define M3UA_SSNM_DAUD 3
	#define M3UA_SSNM_SCON 4
	#define M3UA_SSNM_DUPU 5
	#define M3UA_SSNM_DRST 6

	static const struct tok SS7Messages[] = {
	{ M3UA_SSNM_DUNA, "Destination Unavailable" },
	{ M3UA_SSNM_DAVA, "Destination Available" },
	{ M3UA_SSNM_DAUD, "Destination State Audit" },
	{ M3UA_SSNM_SCON, "Signalling Congestion" },
	{ M3UA_SSNM_DUPU, "Destination User Part Unavailable" },
	{ M3UA_SSNM_DRST, "Destination Restricted" },
	{ 0, NULL }
	};

	/* ASP State Maintenance messages */
	#define M3UA_ASP_UP 1
	#define M3UA_ASP_DN 2
	#define M3UA_ASP_BEAT 3
	#define M3UA_ASP_UP_ACK 4
	#define M3UA_ASP_DN_ACK 5
	#define M3UA_ASP_BEAT_ACK 6

	static const struct tok ASPStateMessages[] = {
	{ M3UA_ASP_UP, "Up" },
	{ M3UA_ASP_DN, "Down" },
	{ M3UA_ASP_BEAT, "Heartbeat" },
	{ M3UA_ASP_UP_ACK, "Up Acknowledgement" },
	{ M3UA_ASP_DN_ACK, "Down Acknowledgement" },
	{ M3UA_ASP_BEAT_ACK, "Heartbeat Acknowledgement" },
	{ 0, NULL }
	};

	/* ASP Traffic Maintenance messages */
	#define M3UA_ASP_AC 1
	#define M3UA_ASP_IA 2
	#define M3UA_ASP_AC_ACK 3
	#define M3UA_ASP_IA_ACK 4

	static const struct tok ASPTrafficMessages[] = {
	{ M3UA_ASP_AC, "Active" },
	{ M3UA_ASP_IA, "Inactive" },
	{ M3UA_ASP_AC_ACK, "Active Acknowledgement" },
	{ M3UA_ASP_IA_ACK, "Inactive Acknowledgement" },
	{ 0, NULL }
	};

	/* Routing Key Management messages */
	#define M3UA_RKM_REQ 1
	#define M3UA_RKM_RSP 2
	#define M3UA_RKM_DEREQ 3
	#define M3UA_RKM_DERSP 4

	static const struct tok RoutingKeyMgmtMessages[] = {
	{ M3UA_RKM_REQ, "Registration Request" },
	{ M3UA_RKM_RSP, "Registration Response" },
	{ M3UA_RKM_DEREQ, "Deregistration Request" },
	{ M3UA_RKM_DERSP, "Deregistration Response" },
	{ 0, NULL }
	};

	/* M3UA Parameters */
	#define M3UA_PARAM_INFO 0x0004
	#define M3UA_PARAM_ROUTING_CTX 0x0006
	#define M3UA_PARAM_DIAGNOSTIC 0x0007
	#define M3UA_PARAM_HB_DATA 0x0009
	#define M3UA_PARAM_TRAFFIC_MODE_TYPE 0x000b
	#define M3UA_PARAM_ERROR_CODE 0x000c
	#define M3UA_PARAM_STATUS 0x000d
	#define M3UA_PARAM_ASP_ID 0x0011
	#define M3UA_PARAM_AFFECTED_POINT_CODE 0x0012
	#define M3UA_PARAM_CORR_ID 0x0013

	#define M3UA_PARAM_NETWORK_APPEARANCE 0x0200
	#define M3UA_PARAM_USER 0x0204
	#define M3UA_PARAM_CONGESTION_INDICATION 0x0205
	#define M3UA_PARAM_CONCERNED_DST 0x0206
	#define M3UA_PARAM_ROUTING_KEY 0x0207
	#define M3UA_PARAM_REG_RESULT 0x0208
	#define M3UA_PARAM_DEREG_RESULT 0x0209
	#define M3UA_PARAM_LOCAL_ROUTING_KEY_ID 0x020a
	#define M3UA_PARAM_DST_POINT_CODE 0x020b
	#define M3UA_PARAM_SI 0x020c
	#define M3UA_PARAM_ORIGIN_POINT_CODE_LIST 0x020e
	#define M3UA_PARAM_PROTO_DATA 0x0210
	#define M3UA_PARAM_REG_STATUS 0x0212
	#define M3UA_PARAM_DEREG_STATUS 0x0213

	static const struct tok ParamName[] = {
	{ M3UA_PARAM_INFO, "INFO String" },
	{ M3UA_PARAM_ROUTING_CTX, "Routing Context" },
	{ M3UA_PARAM_DIAGNOSTIC, "Diagnostic Info" },
	{ M3UA_PARAM_HB_DATA, "Heartbeat Data" },
	{ M3UA_PARAM_TRAFFIC_MODE_TYPE, "Traffic Mode Type" },
	{ M3UA_PARAM_ERROR_CODE, "Error Code" },
	{ M3UA_PARAM_STATUS, "Status" },
	{ M3UA_PARAM_ASP_ID, "ASP Identifier" },
	{ M3UA_PARAM_AFFECTED_POINT_CODE, "Affected Point Code" },
	{ M3UA_PARAM_CORR_ID, "Correlation ID" },
	{ M3UA_PARAM_NETWORK_APPEARANCE, "Network Appearance" },
	{ M3UA_PARAM_USER, "User/Cause" },
	{ M3UA_PARAM_CONGESTION_INDICATION, "Congestion Indications" },
	{ M3UA_PARAM_CONCERNED_DST, "Concerned Destination" },
	{ M3UA_PARAM_ROUTING_KEY, "Routing Key" },
	{ M3UA_PARAM_REG_RESULT, "Registration Result" },
	{ M3UA_PARAM_DEREG_RESULT, "Deregistration Result" },
	{ M3UA_PARAM_LOCAL_ROUTING_KEY_ID, "Local Routing Key Identifier" },
	{ M3UA_PARAM_DST_POINT_CODE, "Destination Point Code" },
	{ M3UA_PARAM_SI, "Service Indicators" },
	{ M3UA_PARAM_ORIGIN_POINT_CODE_LIST, "Originating Point Code List" },
	{ M3UA_PARAM_PROTO_DATA, "Protocol Data" },
	{ M3UA_PARAM_REG_STATUS, "Registration Status" },
	{ M3UA_PARAM_DEREG_STATUS, "Deregistration Status" },
	{ 0, NULL }
	};

	static void
	tag_value_print(netdissect_options *ndo,
	const u_char *buf, const uint16_t tag, const uint16_t size)
	{
	switch (tag) {
	case M3UA_PARAM_NETWORK_APPEARANCE:
	case M3UA_PARAM_ROUTING_CTX:
	case M3UA_PARAM_CORR_ID:
	/* buf and size don't include the header */
	if (size < 4)
	goto invalid;
	ND_TCHECK2(*buf, size);
	ND_PRINT((ndo, "0x%08x", EXTRACT_32BITS(buf)));
	break;
	/* ... */
	default:
	ND_PRINT((ndo, "(length %u)", size + (u_int)sizeof(struct m3ua_param_header)));
	ND_TCHECK2(*buf, size);
	}
	return;

	invalid:
	ND_PRINT((ndo, "%s", istr));
	ND_TCHECK2(*buf, size);
	return;
	trunc:
	ND_PRINT((ndo, "%s", tstr));
	}

	/*
	* 0 1 2 3
	* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
	* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
	* \| Parameter Tag \| Parameter Length \|
	* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
	* \ \
	* / Parameter Value /
	* \ \
	* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
	*/
	static void
	m3ua_tags_print(netdissect_options *ndo,
	const u_char *buf, const u_int size)
	{
	const u_char *p = buf;
	int align;
	uint16_t hdr_tag;
	uint16_t hdr_len;

	while (p < buf + size) {
	if (p + sizeof(struct m3ua_param_header) > buf + size)
	goto invalid;
	ND_TCHECK2(*p, sizeof(struct m3ua_param_header));
	/* Parameter Tag */
	hdr_tag = EXTRACT_16BITS(p);
	ND_PRINT((ndo, "\n\t\t\t%s: ", tok2str(ParamName, "Unknown Parameter (0x%04x)", hdr_tag)));
	/* Parameter Length */
	hdr_len = EXTRACT_16BITS(p + 2);
	if (hdr_len < sizeof(struct m3ua_param_header))
	goto invalid;
	/* Parameter Value */
	align = (p + hdr_len - buf) % 4;
	align = align ? 4 - align : 0;
	ND_TCHECK2(*p, hdr_len + align);
	tag_value_print(ndo, p, hdr_tag, hdr_len - sizeof(struct m3ua_param_header));
	p += hdr_len + align;
	}
	return;

	invalid:
	ND_PRINT((ndo, "%s", istr));
	ND_TCHECK2(*buf, size);
	return;
	trunc:
	ND_PRINT((ndo, "%s", tstr));
	}

	/*
	* 0 1 2 3
	* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
	* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
	* \| Version \| Reserved \| Message Class \| Message Type \|
	* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
	* \| Message Length \|
	* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
	* \ \
	* / /
	*/
	void
	m3ua_print(netdissect_options *ndo,
	const u_char *buf, const u_int size)
	{
	const struct m3ua_common_header hdr = (const struct m3ua_common_header ) buf;
	const struct tok *dict;

	/* size includes the header */
	if (size < sizeof(struct m3ua_common_header))
	goto invalid;
	ND_TCHECK(*hdr);
	if (hdr->v != M3UA_REL_1_0)
	return;

	dict =
	hdr->msg_class == M3UA_MSGC_MGMT ? MgmtMessages :
	hdr->msg_class == M3UA_MSGC_TRANSFER ? TransferMessages :
	hdr->msg_class == M3UA_MSGC_SSNM ? SS7Messages :
	hdr->msg_class == M3UA_MSGC_ASPSM ? ASPStateMessages :
	hdr->msg_class == M3UA_MSGC_ASPTM ? ASPTrafficMessages :
	hdr->msg_class == M3UA_MSGC_RKM ? RoutingKeyMgmtMessages :
	NULL;

	ND_PRINT((ndo, "\n\t\t%s", tok2str(MessageClasses, "Unknown message class %i", hdr->msg_class)));
	if (dict != NULL)
	ND_PRINT((ndo, " %s Message", tok2str(dict, "Unknown (0x%02x)", hdr->msg_type)));

	if (size != EXTRACT_32BITS(&hdr->len))
	ND_PRINT((ndo, "\n\t\t\t@@@@@@ Corrupted length %u of message @@@@@@", EXTRACT_32BITS(&hdr->len)));
	else
	m3ua_tags_print(ndo, buf + sizeof(struct m3ua_common_header), EXTRACT_32BITS(&hdr->len) - sizeof(struct m3ua_common_header));
	return;

	invalid:
	ND_PRINT((ndo, "%s", istr));
	ND_TCHECK2(*buf, size);
	return;
	trunc:
	ND_PRINT((ndo, "%s", tstr));
	}