📄 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 19989.1.2 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.Robert Informational [Page 17] 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 reserved9.2 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 | +-------------------------------+Robert Informational [Page 18] 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 TRAFFIC10.1 Control packet format There are 3 control packets used to open or close the session at the MATIP level for exchanging Type B data10.1.1 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'Robert Informational [Page 19] 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.URobert Informational [Page 20] RFC 2351 MATIP May 199810.1.2.2 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 reserved10.2 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.Robert Informational [Page 21] 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 service11. 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.intRobert Informational [Page 22] RFC 2351 MATIP May 199813. 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] ⌨️ 快捷键说明
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