Wireshark-bugs: [Wireshark-bugs] [Bug 5834] New: Service Indicator in M3UA protocol data
https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=5834
Summary: Service Indicator in M3UA protocol data
Product: Wireshark
Version: 1.5.x (Experimental)
Platform: x86
OS/Version: Windows XP
Status: NEW
Severity: Minor
Priority: Low
Component: Wireshark
AssignedTo: wireshark-bugs@xxxxxxxxxxxxx
ReportedBy: ping.zhu@xxxxxxx
Build Information:
Version 1.5.2-SVN-36641 (SVN Rev 36641 from /trunk)
Copyright 1998-2011 Gerald Combs <gerald@xxxxxxxxxxxxx> and contributors.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
Compiled (32-bit) with GTK+ 2.22.1, with GLib 2.26.1, with WinPcap (version
unknown), with libz 1.2.5, without POSIX capabilities, without libpcre, with
SMI
0.4.8, with c-ares 1.7.1, with Lua 5.1, without Python, with GnuTLS 2.10.3,
with
Gcrypt 1.4.6, with MIT Kerberos, with GeoIP, with PortAudio V19-devel (built
Apr
14 2011), with AirPcap.
Running on Windows XP Service Pack 3, build 2600, with WinPcap version 4.1.2
(packet.dll version 4.1.0.2001), based on libpcap version 1.0 branch 1_0_rel0b
(20091008), GnuTLS 2.10.3, Gcrypt 1.4.6, without AirPcap.
Built using Microsoft Visual C++ 9.0 build 21022
--
I observed some infrequent packets,in which MTP3MG message(COO) overlayed on
M3UA protocol data, however the Service indicator is "Reserved(1)".
MTP 3 User Adaptation Layer
Version: Release 1 (1)
Reserved: 0x00
Message class: Transfer messages (1)
Message type: Payload data (DATA) (1) <===
Message length: 44
Network appearance (12)
Parameter Tag: Network appearance (512)
Parameter length: 8
Network appearance: 12
Protocol data (SS7 message of 10 bytes)
Parameter Tag: Protocol data (528)
Parameter length: 26
OPC: 2730
DPC: 3112
SI: Reserved (1) <===
NI: 3
MP: 0
SLS: 0
[MTP3 equivalents]
Padding: 0000
Message Transfer Part Level 3 Management
.... 0001 = H0 (Message Group): Changeover and changeback messages (0x01)
0001 .... = H1 (Message): Changeover-order signal (0x01)
.000 0000 = Forward Sequence Number: 0
I realized the values of SI are extracted from MTP3-User Identity:
/* packet-m3ua.c
Line 512:
static const value_string user_identity_values[] = {
{ RESERVED_0_USER_ID, "Reserved" },
{ RESERVED_1_USER_ID, "Reserved" },
{ RESERVED_2_USER_ID, "Reserved" },
{ SCCP_USER_ID, "SCCP" },
{ TUP_USER_ID, "TUP" },
{ ISUP_USER_ID, "ISUP" },
{ RESERVED_6_USER_ID, "Reserved" },
{ RESERVED_7_USER_ID, "Reserved" },
{ RESERVED_8_USER_ID, "Reserved" },
{ BROADBAND_ISUP_USER_ID, "Broadband ISUP" },
{ SATELLITE_ISUP_USER_ID, "Satellite ISUP" },
{ RESERVED_11_USER_ID, "Reserved" },
{ AAL_2_SIGNALING_USER_ID,"AAL type2 Signaling"},
{ BICC_USER_ID, "Bearer Independent Call Control (BICC)"},
{ GATEWAY_CONTROL_PROTOCOL_USER_ID, "Gateway Control Protocol"},
{ RESERVED_15_USER_ID, "Reserved" },
{0, NULL } };
Line 2042:
{ &hf_protocol_data_si, { "SI", "m3ua.protocol_data_si", FT_UINT8,
BASE_DEC, VALS(user_identity_values), 0x0, "Service Indicator", HFILL }
},
Actually, "MTP3-User Identity" is only applicable for following messages:
3.4.5. Destination User Part Unavailable (DUPU)
3.6.1. Registration Request (REG REQ)
For DATA message, I think the decoding of SI should comply to original ITU-T
Q.704:
/*rfc4666
3.3.1. Payload Data Message (DATA)
Service Indicator: 8 bits (unsigned integer)
The Service Indicator field contains the SI field from the original SS7
message justified to the least significant bit. Unused bits are coded `0'.
/*ITU-T Q.704
14.2.1 Service indicator
The service indicator codes for the international signalling network
aremallocated as follows:
bits
D C B A
0 0 0 0 Signalling network management messages
0 0 0 1 Signalling network testing and maintenance messages
0 0 1 0 Spare
0 0 1 1 SCCP
0 1 0 0 Telephone User Part
0 1 0 1 ISDN User Part
0 1 1 0 Data User Part (call and circuit-related messages)
0 1 1 1 Data User Part (facility registration and cancellation messages)
1 0 0 0 Reserved for MTP Testing User Part
1 0 0 1 Broadband ISDN User Part
1 0 1 0 Satellite ISDN User Part
1 0 1 1 )
1 1 0 0 )
1 1 0 1 ) Spare
1 1 1 0 )
1 1 1 1 )
--
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