Diameter Base Protocol

Diameter Base Protocol

引用  rfc ： ​​3588                Diameter Based Protocol           Table of Contents   1.  Introduction.................................................   6       1.1.   Diameter Protocol.....................................   9              1.1.1.   Description of the Document Set..............  10       1.2.   Approach to Extensibility.............................  11              1.2.1.   Defining New AVP Values......................  11              1.2.2.   Creating New AVPs............................  11              1.2.3.   Creating New Authentication Applications.....  11              1.2.4.   Creating New Accounting Applications.........  12              1.2.5.   Application Authentication Procedures........  14       1.3.   Terminology...........................................  14   2.  Protocol Overview............................................  18       2.1.   Transport.............................................  20              2.1.1.   SCTP Guidelines..............................  21       2.2.   Securing Diameter Messages............................  21       2.3.   Diameter Application Compliance.......................  21       2.4.   Application Identifiers...............................  22       2.5.   Connections vs. Sessions..............................  22       2.6.   Peer Table............................................  23       2.7.   Realm-Based Routing Table.............................  24       2.8.   Role of Diameter Agents...............................  25              2.8.1.   Relay Agents.................................  26              2.8.2.   Proxy Agents.................................  27              2.8.3.   Redirect Agents..............................  28              2.8.4.   Translation Agents...........................  29       2.9.   End-to-End Security Framework.........................  30       2.10.  Diameter Path Authorization...........................  30   3.  Diameter Header..............................................  32       3.1.   Command Codes.........................................  35       3.2.   Command Code ABNF specification.......................  36       3.3.   Diameter Command Naming Conventions...................  38   4.  Diameter AVPs................................................  38       4.1.   AVP Header............................................  39              4.1.1.   Optional Header Elements.....................  41       4.2.   Basic AVP Data Formats................................  41       4.3.   Derived AVP Data Formats..............................  42       4.4.   Grouped AVP Values....................................  49              4.4.1.   Example AVP with a Grouped Data Type.........  50       4.5.   Diameter Base Protocol AVPs...........................  53   5.  Diameter Peers...............................................  56       5.1.   Peer Connections......................................  56       5.2.   Diameter Peer Discovery...............................  56       5.3.   Capabilities Exchange.................................  59              5.3.1.   Capabilities-Exchange-Request................  60              5.3.2.   Capabilities-Exchange-Answer.................  60              5.3.3.   Vendor-Id AVP................................  61              5.3.4.   Firmware-Revision AVP........................  61Calhoun, et al.             Standards Track                     [Page 2]RFC 3588                Diameter Based Protocol           September 2003              5.3.5.   Host-IP-Address AVP..........................  62              5.3.6.   Supported-Vendor-Id AVP......................  62              5.3.7.   Product-Name AVP.............................  62       5.4.   Disconnecting Peer Connections........................  62              5.4.1.   Disconnect-Peer-Request......................  63              5.4.2.   Disconnect-Peer-Answer.......................  63              5.4.3.   Disconnect-Cause AVP.........................  63       5.5.   Transport Failure Detection...........................  64              5.5.1.   Device-Watchdog-Request......................  64              5.5.2.   Device-Watchdog-Answer.......................  64              5.5.3.   Transport Failure Algorithm..................  65              5.5.4.   Failover and Failback Procedures.............  65       5.6.   Peer State Machine....................................  66              5.6.1.   Incoming connections.........................  68              5.6.2.   Events.......................................  69              5.6.3.   Actions......................................  70              5.6.4.   The Election Process.........................  71   6.  Diameter Message Processing..................................  71       6.1.   Diameter Request Routing Overview.....................  71              6.1.1.   Originating a Request........................  73              6.1.2.   Sending a Request............................  73              6.1.3.   Receiving Requests...........................  73              6.1.4.   Processing Local Requests....................  73              6.1.5.   Request Forwarding...........................  74              6.1.6.   Request Routing..............................  74              6.1.7.   Redirecting Requests.........................  74              6.1.8.   Relaying and Proxying Requests...............  75       6.2.   Diameter Answer Processing............................  76              6.2.1.   Processing Received Answers..................  77              6.2.2.   Relaying and Proxying Answers................  77       6.3.   Origin-Host AVP.......................................  77       6.4.   Origin-Realm AVP......................................  78       6.5.   Destination-Host AVP..................................  78       6.6.   Destination-Realm AVP.................................  78       6.7.   Routing AVPs..........................................  78              6.7.1.   Route-Record AVP.............................  79              6.7.2.   Proxy-Info AVP...............................  79              6.7.3.   Proxy-Host AVP...............................  79              6.7.4.   Proxy-State AVP..............................  79       6.8.   Auth-Application-Id AVP...............................  79       6.9.   Acct-Application-Id AVP...............................  79       6.10.  Inband-Security-Id AVP................................  79       6.11.  Vendor-Specific-Application-Id AVP....................  80       6.12.  Redirect-Host AVP.....................................  80       6.13.  Redirect-Host-Usage AVP...............................  80       6.14.  Redirect-Max-Cache-Time AVP...........................  81       6.15.  E2E-Sequence AVP......................................  82Calhoun, et al.             Standards Track                     [Page 3]RFC 3588                Diameter Based Protocol           September 2003   7.  Error Handling...............................................  82       7.1.   Result-Code AVP.......................................  84              7.1.1.   Informational................................  84              7.1.2.   Success......................................  84              7.1.3.   Protocol Errors..............................  85              7.1.4.   Transient Failures...........................  86              7.1.5.   Permanent Failures...........................  86       7.2.   Error Bit.............................................  88       7.3.   Error-Message AVP.....................................  89       7.4.   Error-Reporting-Host AVP..............................  89       7.5.   Failed-AVP AVP........................................  89       7.6.   Experimental-Result AVP...............................  90       7.7.   Experimental-Result-Code AVP..........................  90   8.  Diameter User Sessions.......................................  90       8.1.   Authorization Session State Machine...................  92       8.2.   Accounting Session State Machine......................  96       8.3.   Server-Initiated Re-Auth.............................. 101              8.3.1.   Re-Auth-Request.............................. 102              8.3.2.   Re-Auth-Answer............................... 102       8.4.   Session Termination................................... 103              8.4.1.   Session-Termination-Request.................. 104              8.4.2.   Session-Termination-Answer................... 105       8.5.   Aborting a Session.................................... 105              8.5.1.   Abort-Session-Request........................ 106              8.5.2.   Abort-Session-Answer......................... 106       8.6.   Inferring Session Termination from Origin-State-Id.... 107       8.7.   Auth-Request-Type AVP................................. 108       8.8.   Session-Id AVP........................................ 108       8.9.   Authorization-Lifetime AVP............................ 109       8.10.  Auth-Grace-Period AVP................................. 110       8.11.  Auth-Session-State AVP................................ 110       8.12.  Re-Auth-Request-Type AVP.............................. 110       8.13.  Session-Timeout AVP................................... 111       8.14.  User-Name AVP......................................... 111       8.15.  Termination-Cause AVP................................. 111       8.16.  Origin-State-Id AVP................................... 112       8.17.  Session-Binding AVP................................... 113       8.18.  Session-Server-Failover AVP........................... 113       8.19.  Multi-Round-Time-Out AVP.............................. 114       8.20.  Class AVP............................................. 114       8.21.  Event-Timestamp AVP................................... 115   9.  Accounting................................................... 115       9.1.   Server Directed Model................................. 115       9.2.   Protocol Messages..................................... 116       9.3.   Application Document Requirements..................... 116       9.4.   Fault Resilience...................................... 116       9.5.   Accounting Records.................................... 117       9.6.   Correlation of Accounting Records..................... 118Calhoun, et al.             Standards Track                     [Page 4]RFC 3588                Diameter Based Protocol           September 2003       9.7.   Accounting Command-Codes.............................. 119              9.7.1.   Accounting-Request........................... 119              9.7.2.   Accounting-Answer............................ 120       9.8.   Accounting AVPs....................................... 121              9.8.1.   Accounting-Record-Type AVP................... 121              9.8.2.   Acct-Interim-Interval AVP.................... 122              9.8.3.   Accounting-Record-Number AVP................. 123              9.8.4.   Acct-Session-Id AVP.......................... 123              9.8.5.   Acct-Multi-Session-Id AVP.................... 123              9.8.6.   Accounting-Sub-Session-Id AVP................ 123              9.8.7.   Accounting-Realtime-Required AVP............. 123   10. AVP Occurrence Table......................................... 124       10.1.  Base Protocol Command AVP Table....................... 124       10.2.  Accounting AVP Table.................................. 126   11. IANA Considerations.......................................... 127       11.1.  AVP Header............................................ 127              11.1.1.  AVP Code..................................... 127              11.1.2.  AVP Flags.................................... 128       11.2.  Diameter Header....................................... 128              11.2.1.  Command Codes................................ 128              11.2.2.  Command Flags................................ 129       11.3.  Application Identifiers............................... 129       11.4.  AVP Values............................................ 129              11.4.1.  Result-Code AVP Values....................... 129              11.4.2.  Accounting-Record-Type AVP Values............ 130              11.4.3.  Termination-Cause AVP Values................. 130              11.4.4.  Redirect-Host-Usage AVP Values............... 130              11.4.5.  Session-Server-Failover AVP Values........... 130              11.4.6.  Session-Binding AVP Values................... 130              11.4.7.  Disconnect-Cause AVP Values.................. 130              11.4.8.  Auth-Request-Type AVP Values................. 130              11.4.9.  Auth-Session-State AVP Values................ 130              11.4.10. Re-Auth-Request-Type AVP Values.............. 131              11.4.11. Accounting-Realtime-Required AVP Values...... 131       11.5.  Diameter TCP/SCTP Port Numbers........................ 131       11.6.  NAPTR Service Fields.................................. 131   12. Diameter Protocol Related Configurable Parameters............ 131   13. Security Considerations...................................... 132       13.1.  IPsec Usage........................................... 133       13.2.  TLS Usage............................................. 134       13.3.  Peer-to-Peer Considerations........................... 134   14. References................................................... 136       14.1.  Normative References.................................. 136       14.2.  Informative References................................ 138   15. Acknowledgements............................................. 140   Appendix A.  Diameter Service Template........................... 141   Appendix B.  NAPTR Example....................................... 142   Appendix C.  Duplicate Detection................................. 143

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