📄 rfc2351.txt
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HDR
This field specifies which part of the airline's specific address is
placed ahead of the message text transmitted over the session.
Possible values are:
00 : used in TYPE A SITA Host to Host Header = H1+H2+Flow ID
01 : used in TYPE A SITA Host to Host Header = Flow ID
10 : No Header (default for IATA host to Host)
11 : Not used
The MPX and HDR must be coherent. When flow are multiplexed, the data
must contain the flow identification. The table below summarizes the
possible combinations:
+---------------------+
| MPX | 01 | 10 |
+---------------------+
| HDR | | |
| 00 | Y | Y |
| 01 | Y | Y |
| 10 | N | Y |
+---------------------+
H1 H2
These fields can be used to identify the session. When this field is
not used, it must be set to 0. If HDR=00, H1H2 in data packet must
have the same value as set in SO command.
Flow ID
This field is optional and indicates the Flow ID (range 3F - 4F Hex).
Robert Informational [Page 16]
RFC 2351 MATIP May 1998
9.1.2 Open Confirm format (OC)
The OC (Open Confirm) command is a response to an SO (Session Open)
command and is used to either refuse the session or accept it.
9.1.2.1 Refuse the connection
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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0|0|0|0|0| Ver |1|1 1 1 1 1 0 1|0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 1|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| cause |
+-+-+-+-+-+-+-+-+
Cause
This field indicates the reason for the MATIP session refusal
0 0 0 0 0 0 0 1 : No Traffic Type matching between Sender &
Recipient
0 0 0 0 0 0 1 0 : Information in SO header incoherent
1 0 0 0 0 1 0 0
up to : Application dependent
1 1 1 1 1 1 1 1
Other values reserved.
9.1.2.2 Accept the connection
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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0|0|0|0|0| Ver |1|1 1 1 1 1 0 1|0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 1|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0 0 0 0|
+-+-+-+-+-+-+-+-+
9.1.3 Session Close (SC)
The SC (Session Close) command is used to close an existing MATIP
session.
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RFC 2351 MATIP May 1998
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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0|0|0|0|0| Ver |1|1 1 1 1 1 0 0|0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 1|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Close Cause |
+-+-+-+-+-+-+-+-+
Close Cause
Indicates the reason for the session closure:
0 0 0 0 0 0 0 0 : Normal Close
1 0 0 0 0 1 0 0
up to : Application dependent
1 1 1 1 1 1 1 1
Other values reserved
9.2 Data Packet Format
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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0|0|0|0|0| Ver |0|0 0 0 0 0 0 0| length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| ID (optional) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
| Payload |
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
ID
This field is optional and has a different length and format
according to the value of HDR indicated during the session
establishment.
+-------------------------------+
|HDR | I.D. |
+-------------------------------+
|00 |ID = 3 bytes H1-H2 FLOW ID|
+-------------------------------+
|01 |ID = FLOW ID |
+-------------------------------+
|10 |ID nor present |
+-------------------------------+
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RFC 2351 MATIP May 1998
Payload packet
The payload format is relevant to the MATIP layer. It is formatted
according to the IATA host to host specifications and agreed
bilaterally by the sender and the receiver.
10. MATIP FORMAT FOR TYPE B TRAFFIC
10.1 Control packet format
There are 3 control packets used to open or close the session at the
MATIP level for exchanging Type B data
10.1.1 Session Open format (SO)
Before sending any data packets, it is recommended to let the systems
establishing a session check that they are indeed able to communicate
(i.e., Both systems agree on the characteristics of the traffic that
will cross the connection). For this purpose, a two way handshake,
using the Session commands defined hereafter, is performed
immediately after the establishment of the TCP level connection.
Either side can initiate this procedure. In case of collision, the
open session from the side having the lower IP address is ignored.
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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0|0|0|0|0| Ver |1|1 1 1 1 1 1 0| length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0| C D | PROTEC| BFLAG | Sender HLD |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Recipient HLD |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Length
This field indicates the number of bytes of the whole command, header
included. The only possible values are equal to 6 bytes or 10 bytes.
CD
This field specifies the Coding, as defined in section 8.1.1.1.
PROTEC
Identifies the end to end Messaging Responsibility Transfer protocol
used.
0010: BATAP
All other values available.
BFLAG (X means `do not care'
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RFC 2351 MATIP May 1998
X X 0 0 means that the fields `Sender HLD, Recipient HLD' do not exist
in this packet. In this case, the exact length of the packet is 6
Bytes.
X X 1 0 means that the `Sender HLD, Recipient HLD' are carried
respectively in bytes 9,10 and 11,12 of this packet. In this
case, the exact length of the packet is 10 Bytes.
0 0 X X means that the connection request has been transmitted from a
host (Mainframe system)
0 1 X X means that the connection request has been transmitted from a
gateway)
Sender HLD
HLD of the Type B System sending the Session Open.
Recipient HLD
HLD of the Type B system to which session opening is destined.
10.1.2 Open confirm format (OC)
The OC (Open Confirm) command is a response to an SO (Session Open)
command and is used to either refuse the session or accept it.
10.1.2.1 Refuse the connection
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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0|0|0|0|0| Ver |1|1 1 1 1 1 0 1|0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 1|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0|1| Cause |
+-+-+-+-+-+-+-+-+
Length of this packet is 5 Bytes.
Cause
Indicates the cause of the rejection
0 0 0 0 0 1 : No Traffic Type matching between Sender & Recipient
0 0 0 0 1 0 : Information in SO header incoherent
0 0 0 0 1 1 : Type of Protection mechanism are different
0 0 0 1 0 0 up to 1 1 1 1 1 1 : R.F.U
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RFC 2351 MATIP May 1998
10.1.2.2 Accept the connection
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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0|0|0|0|0| Ver |1|1 1 1 1 1 0 1|0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 1|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0 0 0 0|
+-+-+-+-+-+-+-+-+
Length of this packet is 5 Bytes.
10.1.3 Session Close (SC)
The SC (Session Close) command is used to close an existing MATIP
session.
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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0|0|0|0|0| Ver |1|1 1 1 1 1 0 0|0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 1|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Close Cause |
+-+-+-+-+-+-+-+-+
Close Cause
Indicates the reason for the session closure:
0 0 0 0 0 0 0 0 : Normal Close
1 0 0 0 0 1 0 0 up to 1 1 1 1 1 1 1 1 : Application dependent
Other values reserved
10.2 Data packet format
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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0|0|0|0|0| Ver |0|0 0 0 0 0 0 0| length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
| Payload |
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Length
This field indicates the number of bytes of the whole packet, header
included.
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RFC 2351 MATIP May 1998
Payload
Type B message formatted according to the IATA standard and
conforming to the rules of the accessed TYPE B service
11. Security Considerations
The security is a very sensitive point for airline industry. Security
for the MATIP users can take place at different levels:
The ASCU must be defined to enable the session with the host
application. The control can be achieved in two ways: either the ASCU
address (H1 H2 A1 A2) is defined at the application level by the
means of a static configuration, or the ASCU is identified by a User
ID / password. In most cases, the User ID and Password are verified
by a dedicated software running in the central host. But they can
also be checked by the application itself.
The MATIP sessions being transported over TCP/IP, It can go through a
firewall. Depending on the firewall level, the control can be
performed at network (IP addresses) or TCP application layer.
For higher level of security all compliant implementations MAY
implement IPSEC ESP for securing control packets. Replay protection,
the compulsory cipher suite for IPSEC ESP, and NULL encryption MAY be
implemented. Optionally, IPSEC AH MAY also be supported. All
compliant implementations MAY also implement IPSEC ESP for protection
of data packets. Replay prevention and integrity protection using
IPSEC ESP mandated cipher suit MAY be implemented. NULL encryption
also MAY be supported. Other IPSEC ESP required ciphers MAY also be
supported.
12. Author's Address
Alain Robert
S.I.T.A.
18, rue Paul Lafargue
92904 PARIS LA DEFENSE 10
FRANCE
Phone: 33 1 46411491
Fax: 33 1 46411277
EMail: arobert@par1.par.sita.int
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RFC 2351 MATIP May 1998
13. Full Copyright Statement
Copyright (C) The Internet Society (1998). All Rights Reserved.
This document and translations of it may be copied and furnished to
others, and derivative works that comment on or otherwise explain it
or assist in its implementation may be prepared, copied, published
and distributed, in whole or in part, without restriction of any
kind, provided that the above copyright notice and this paragraph are
included on all such copies and derivative works. However, this
document itself may not be modified in any way, such as by removing
the copyright notice or references to the Internet Society or other
Internet organizations, except as needed for the purpose of
developing Internet standards in which case the procedures for
copyrights defined in the Internet Standards process must be
followed, or as required to translate it into languages other than
English.
The limited permissions granted above are perpetual and will not be
revoked by the Internet Society or its successors or assigns.
This document and the information contained herein is provided on an
"AS IS" basis and THE INTERNET SOCIETY AND THE INTERNET ENGINEERING
TASK FORCE DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING
BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE INFORMATION
HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED WARRANTIES OF
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
Robert Informational [Page 23]
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