Diameter Maintenance and J. Korhonen, Ed.
Extensions (DIME) TeliaSonera
Internet-Draft H. Tschofenig
Intended status: Standards Track Nokia Siemens Networks
Expires: January 3, 2008 M. Arumaithurai
University of Goettingen
July 2, 2007
Quality of Service Attributes for Diameter and RADIUS
draft-ietf-dime-qos-attributes-00.txt
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Copyright Notice
Copyright (C) The IETF Trust (2007).
Abstract
This document extends the functionality of the Diameter Base protocol
and other Diameter applications with respect to their ability to
convey Quality of Service information. The AVPs defined in this
document are also available for Remote Authentication Dial In User
Service (RADIUS).
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 3
3. Commands, AVPs and Advertising Application Support . . . . . . 3
3.1. Command Codes . . . . . . . . . . . . . . . . . . . . . . 3
3.2. Diameter-EAP-Request (DER) . . . . . . . . . . . . . . . . 4
3.3. Diameter-EAP-Answer (DEA) . . . . . . . . . . . . . . . . 4
3.4. Credit-Control-Request (CCR) . . . . . . . . . . . . . . . 5
3.5. Credit-Control-Answer (CCA) . . . . . . . . . . . . . . . 6
3.6. AA-Request (AAR) . . . . . . . . . . . . . . . . . . . . . 7
3.7. AA-Answer (AAA) . . . . . . . . . . . . . . . . . . . . . 8
4. Diameter QoS Defined AVPs . . . . . . . . . . . . . . . . . . 9
4.1. QoS-ID AVP . . . . . . . . . . . . . . . . . . . . . . . . 9
4.2. QoS-Flow-State AVP . . . . . . . . . . . . . . . . . . . . 9
4.3. QSPEC AVP . . . . . . . . . . . . . . . . . . . . . . . . 9
4.4. QoS-Resources AVP . . . . . . . . . . . . . . . . . . . . 10
4.5. QoS-Parameter AVP . . . . . . . . . . . . . . . . . . . . 10
4.6. Extended-QoS-Filter-Rule AVP . . . . . . . . . . . . . . . 10
4.7. QoS-Capability AVP . . . . . . . . . . . . . . . . . . . . 10
4.8. QSPEC-Type AVP . . . . . . . . . . . . . . . . . . . . . . 11
5. Example . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
6. AVP Occurrence Tables . . . . . . . . . . . . . . . . . . . . 12
6.1. DER and DEA Commands AVP Table . . . . . . . . . . . . . . 12
6.2. CCR and CCA Commands AVP Table . . . . . . . . . . . . . . 13
6.3. AAR and AAA Commands AVP Table . . . . . . . . . . . . . . 13
7. Diameter RADIUS Interoperability . . . . . . . . . . . . . . . 14
8. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 14
9. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 14
10. Security Considerations . . . . . . . . . . . . . . . . . . . 14
11. References . . . . . . . . . . . . . . . . . . . . . . . . . . 14
11.1. Normative References . . . . . . . . . . . . . . . . . . . 14
11.2. Informative References . . . . . . . . . . . . . . . . . . 15
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 15
Intellectual Property and Copyright Statements . . . . . . . . . . 17
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1. Introduction
This document defines a number of Diameter Quality of Service (QoS)
related AVPs that can be used with the Diameter Base protocol, and
Diameter Credit Control, Diameter EAP and Diameter NASREQ
applications to convey Quality of Service information. The Extended-
QoS-Filter-Rule AVP thereby replaces the QoSFilterRule, defined in
RFC 3588 [RFC3588], and the QoS-Filter-Rule, defined in RFC 4005
[RFC4005].
The AVPs defined in this document are also available for Remote
Authentication Dial In User Service (RADIUS).
2. Terminology
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in RFC 2119 [RFC2119].
3. Commands, AVPs and Advertising Application Support
3.1. Command Codes
This document re-uses the Diameter Base protocol [RFC3588], and
Diameter Credit-Control [RFC4006], Diameter NASREQ [RFC4072] and
Diameter EAP [RFC4005] application commands. The following commands
are re-used to carry QoS related AVPs:
Command-Name Abbrev. Code Reference
Diameter-EAP-Request DER 268 RFC 4072
Diameter-EAP-Answer DEA 268 RFC 4072
Credit-Control-Request CCR 272 RFC 4006
Credit-Control-Answer CCA 272 RFC 4006
AA-Request AAR 265 RFC 4005
AA-Answer AAA 265 RFC 4005
Figure 1: Command Codes
When the Re-Auth-Request (RAR), Re-Auth-Answer (RAA), Session-
Termination-Request (STR), Session-Termination-Answer (STA), Abort-
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Session-Request (ASR), Abort-Session-Answer (ASA), Accounting-Request
(ACR), and Accounting-Answer (ACA) commands are used together with
this specification they follow the rules in Diameter NASREQ
[RFC4005], Diameter EAP [RFC4072], Credit-Control [RFC4006] and
Diameter Base Protocol [RFC3588]. The accounting commands use the
Application Identifier value of the respective application.
3.2. Diameter-EAP-Request (DER)
The Diameter-EAP-Request (DER) command [RFC4072], indicated by the
Command-Code field set to 268 and the 'R' bit set in the Command
Flags field, may be sent by the NAS to the Diameter server providing
network access authentication and authorization services. At the
same time as the network access authentication and authorization, the
NAS MAY request the Diameter server to authorize provisioning of QoS
resources.
The message format is the same as defined in [RFC4072] with an
addition of Diameter QoS specific AVPs. Figure 2 shows the DER
message used with the Diameter QoS AVPs:
<Diameter-EAP-Request> ::= < Diameter Header: 268, REQ, PXY >
< Session-Id >
{ Auth-Application-Id }
{ Origin-Host }
{ Origin-Realm }
{ Destination-Realm }
{ Auth-Request-Type }
[ Destination-Host ]
[ User-Name ]
[ QoS-Capability ]
* [ QoS-Resources ]
...
* [ AVP ]
Figure 2: Diameter EAP Request Command
3.3. Diameter-EAP-Answer (DEA)
The Diameter-EAP-Answer (DEA) message defined in [RFC4072], indicated
by the Command- Code field set to 268 and 'R' bit cleared in the
Command Flags field is sent in response to the Diameter-EAP-Request
message (DER). If the QoS service is successfully authorized and the
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Diameter server was able to fulfill the QoS Authorization request (if
needed) then the response MAY include the QoS-Resources AVPs.
The message format is the same as defined in [RFC4072] with an
addition of Diameter QoS specific AVPs. Figure 3 shows the DEA
message used with the Diameter QoS AVPs:
<Diameter-EAP-Answer> ::= < Diameter Header: 268, PXY >
< Session-Id >
{ Auth-Application-Id }
{ Auth-Request-Type }
{ Result-Code }
{ Origin-Host }
{ Origin-Realm }
* [ QoS-Resources ]
[ Session-Timeout ]
[ User-Name ]
...
* [ AVP ]
Figure 3: Diameter EAP Answer Command
3.4. Credit-Control-Request (CCR)
The Credit-Control-Request (CCR) command [RFC4006], indicated by the
Command-Code field set to 272 and the 'R' bit set in the Command
Flags field, may be sent by the NAS to the Diameter-QoS server to
request QoS credit authorization for a given QoS provisioning
request. In that case the CCR command MAY also carry the QoS-
Resources AVPs.
The message format is the same as defined in [RFC4006] with an
addition of Diameter QoS specific AVPs. Figure 4 shows the CCR
message used with the Diameter QoS AVPs:
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<Credit-Control-Request> ::= < Diameter Header: 272, REQ, PXY >
< Session-Id >
{ Auth-Application-Id }
{ Origin-Host }
{ Origin-Realm }
{ Destination-Realm }
{ Auth-Request-Type }
{ Service-Context-Id }
{ CC-Request-Type }
{ CC-Request-Number }
[ Destination-Host ]
[ User-Name ]
[ QoS-Capability ]
* [ QoS-Resources ]
...
* [ AVP ]
Figure 4: Credit Control Request Command
3.5. Credit-Control-Answer (CCA)
The Credit-Control-Answer (CCA) command [RFC4006], indicated by the
Command-Code field set to 272 and the 'R' bit set in the Command
Flags field is sent in response to the CC-Request (CCR) message to
acknowledge a CC-Request command. If the Diameter QoS server was
able to fulfill the QoS request (if needed) then the response MAY
include the QoS-Resources AVPs.
The message format is the same as defined in [RFC4006] with an
addition of Diameter QoS specific AVPs. Figure 5 shows the CCA
message used with the Diameter QoS AVPs:
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<Credit-Control-Answer> ::= < Diameter Header: 272, PXY >
< Session-Id >
{ Result-Code }
{ Origin-Host }
{ Origin-Realm }
{ Auth-Application-Id }
{ CC-Request-Type }
{ CC-Request-Number }
[ User-Name ]
[ CC-Session-Failover ]
[ CC-Sub-Session-Id ]
[ Acct-Multi-Session-Id ]
[ Origin-State-Id ]
[ Event-Timestamp ]
* [ QoS-Resources ]
...
* [ AVP ]
Figure 5: Credit Control Answer Command
3.6. AA-Request (AAR)
The AA-Request (AAR) message, indicated by the Command-Code field set
to 265 and 'R' bit set in the Command Flags field, may be sent by the
NAS to the Diameter server providing network access configuration
services. At the same time as the network access authentication and
authorization, the NAS MAY request the Diameter server to authorize
provisioning of QoS resources.
The message format is the same as defined in [RFC4005] with an
addition of Diameter QoS specific AVPs. Figure 6 shows the AAR
message used with the Diameter QoS AVPs:
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<AA-Request> ::= < Diameter Header: 265, REQ, PXY >
< Session-Id >
{ Auth-Application-Id }
{ Origin-Host }
{ Origin-Realm }
{ Destination-Realm }
{ Auth-Request-Type }
[ QoS-Capability ]
* [ QoS-Resources ]
[ Destination-Host ]
...
* [ AVP ]
Figure 6: AA Request Command
3.7. AA-Answer (AAA)
The AA-Answer (AAA) message, indicated by the Command-Code field set
to 265 and 'R' bit cleared in the Command Flags field is sent in
response to the AA-Request (AAR) message for confirmation of the
result of QoS provisioning. If the QoS service is successfully
authorized and the Diameter server was able to fulfill the QoS
provisioning request (if needed) then the response MAY include the
QoS-Resources AVPs.
The message format is the same as defined in [RFC4005] with an
addition of Diameter QoS specific AVPs. Figure 7 shows the AAA
message used with the Diameter QoS AVPs:
<AA-Answer> ::= < Diameter Header: 265, PXY >
< Session-Id >
{ Auth-Application-Id }
{ Auth-Request-Type }
{ Result-Code }
{ Origin-Host }
{ Origin-Realm }
* [ QoS-Resources ]
[ User-Name ]
[ Session-Timeout ]
...
* [ AVP ]
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Figure 7: AA Answer Command
4. Diameter QoS Defined AVPs
The following table lists the Diameter AVPs used by this document,
their AVP code values, types, possible flag values, and whether the
AVP may be encrypted.
+------------------+
| AVP Flag Rules |
+-------------------------------------------------|----+---+----+----+
| AVP Section |MUST|MAY|SHLD|MUST|
| Attribute Name Code Defined Data Type | | | NOT| NOT|
+-------------------------------------------------+----+---+----+----+
|QoS-Flow-State TBD 4.2 Enumerated | |M,P| | V |
|QSPEC TBD 4.3 OctetSTring| |M,P| | V |
|QoS-ID TBD 4.1 Unsigned32 | |M,P| | V |
|Extended-QoS-Filter-Rule TBD 4.6 Grouped | |M,P| | V |
|QoS-Resources TBD 4.4 Grouped | |M,P| | V |
|QoS-Parameter TBD 4.5 Grouped | |M,P| | V |
|QoS-Capability TBD 4.7 Grouped | |M,P| | V |
|QSPEC-Type TBD 4.8 Unsigned32 | |M,P| | V |
+-------------------------------------------------+----+---+----+----+
4.1. QoS-ID AVP
The QoS-ID AVP (AVP Code TBD) is of type Unsigned32 and references
the QSPEC.
4.2. QoS-Flow-State AVP
The QoS-Flow-State AVP (AVP Code TBD) is of type Enumerated. It
gives an indication as to how the flow MUST be treated. The
Extended-QoS-Filter-Rule already provides an indicate whether a flow
is permitted or denied. This optional AVP provides additional
information about the treatment. Currently a single value is
defined; further values are available via IANA registration.
0 Pending: The filter rules are not installed but kept pending.
Subsequent signaling is necessary to active them.
4.3. QSPEC AVP
The QSPEC AVP (AVP Code TBD) is of type OctetString and contains
Quality of Service parameters. These parameters are defined in a
separate document, see [I-D.ietf-dime-qos-parameters].
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4.4. QoS-Resources AVP
The QoS-Resources AVP (AVP Code TBD) is of type Grouped and includes
description of the resources that have been authorized or requested.
More than one QoS-Resources AVP MAY be included in a single message.
QoS-Resources ::= < AVP Header: XXX >
1* [ Extended-QoS-Filter-Rule ]
1* [ QoS-Parameter ]
[ QoS-Flow-State ]
* [ AVP ]
4.5. QoS-Parameter AVP
The QoS-Parameter AVP (AVP Code TBD) is of type Grouped and ties the
QoS-ID AVP together to the QSPEC AVP. All parameters followed by the
QSPEC-Type AVP refer to the same QoS model/profile.
QoS-Parameter ::= < AVP Header: XXX >
{ QoS-ID }
{ QSPEC-Type }
1* [ QSPEC ]
* [ AVP ]
4.6. Extended-QoS-Filter-Rule AVP
TheExtended-QoS-Filter-Rule AVP (AVP Code TBD) is of type Grouped.
The QoS filter rule associated with the QoS-ID re-uses the RADIUS
NAS-Traffic-Rule AVP [I-D.ietf-radext-filter-rules]. This AVP ties a
specific filter to a QoS-ID that in turn refers to a specific QoS-
Parameter.
Extended-QoS-Filter-Rule ::= < AVP Header: XXX >
{ QoS-ID }
{ NAS-Traffic-Rule }
* [ AVP ]
4.7. QoS-Capability AVP
The QoS-Capability AVP (AVP Code TBD) is of type Grouped and contains
a list of supported QSPEC-Types and respective AVPs.
The NAS SHOULD include this AVP from the NAS to the Diameter server
to indicate the support for this specification and for the specific
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QoS models.
QoS-Capability ::= < AVP Header: XXX >
1* { QSPEC-Type }
* [ AVP ]
4.8. QSPEC-Type AVP
The QSPEC-Type AVP (AVP Code TBD) is of type Unsigned32 and contains
the supported QoS model or QoS profile. The value of 0 refers to the
QoS parameters described in [I-D.ietf-dime-qos-parameters]. The
values are taken from the registry defined in [I-D.ietf-nsis-qspec].
5. Example
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User AAA Client AAA server
| | |
| (initiate EAP) | |
|<------------------------------>| |
| | Diameter-EAP-Request |
| | EAP-Payload(EAP Start) |
| | QoS-Capability |
| |------------------------------->|
| | |
| | Diameter-EAP-Answer |
| Result-Code=DIAMETER_MULTI_ROUND_AUTH |
| | EAP-Payload(EAP Request #1) |
| |<-------------------------------|
| EAP Request(Identity) | |
|<-------------------------------| |
| | |
| EAP Response #N | |
|------------------------------->| |
| | Diameter-EAP-Request |
| | EAP-Payload(EAP Response #N) |
| |------------------------------->|
| | |
| | Diameter-EAP-Answer |
| | Result-Code=DIAMETER_SUCCESS |
| | EAP-Payload(EAP Success) |
| | [EAP-Master-Session-Key] |
| | (authorization AVPs) |
| | QoS-Resources |
| |<-------------------------------|
| | |
| EAP Success | |
|<-------------------------------| |
| | |
Figure 8: Example of AAA Server providing QoS Information to AAA
Client
6. AVP Occurrence Tables
6.1. DER and DEA Commands AVP Table
The following table lists the Quality of Service specific AVPs
defined in this document that may be present in the DER and DEA
Commands, as defined in this document and in [RFC4072].
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+---------------+
| Command-Code |
|-------+-------+
Attribute Name | DER | DEA |
-------------------------------+-------+-------+
QoS-Capability | 0-1 | 0 |
QoS-Resources | 0+ | 0+ |
+-------+-------+
Figure 9: DER and DEA Commands AVP table
6.2. CCR and CCA Commands AVP Table
The following table lists the Quality of Service specific AVPs
defined in this document that may be present in the CCR and CCA
Commands, as defined in this document and in [RFC4006].
+---------------+
| Command-Code |
|-------+-------+
Attribute Name | CCR | CCA |
-------------------------------+-------+-------+
QoS-Capability | 0-1 | 0 |
QoS-Resources | 0+ | 0+ |
+-------+-------+
Figure 10: CCR and CCA Commands AVP table
6.3. AAR and AAA Commands AVP Table
The following table lists the Quality of Service specific AVPs
defined in this document that may be present in the AAR and AAA
Commands, as defined in this document and in [RFC4005].
+---------------+
| Command-Code |
|-------+-------+
Attribute Name | AAR | AAA |
-------------------------------+-------+-------+
QoS-Capability | 0-1 | 0 |
QoS-Resources | 0+ | 0+ |
+-------+-------+
Figure 11: AAR and AAA Commands AVP table
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7. Diameter RADIUS Interoperability
[Editor's Note: Text will be provided in a future version of this
document.]
8. Acknowledgments
We would like to thank Victor Fajardo for his comments.
9. IANA Considerations
Diameter reserves the AVP Codes 0 - 255 for RADIUS functions that are
implemented in Diameter. AVPs new to Diameter have code values of
256 and greater.
This specification assigns the values TBD-1 to TBD-2 from the AVP
Code namespace defined in RFC 3588 [RFC3588]. See Section 4 for the
newly defined AVPs.
This specification also specifies the use of AVPs in the 0 - 255
range, which are defined in 'RADIUS Types', see
http://www.iana.org/assignments/radius-types. These values are
assigned by the policy in Section 6 of RFC 2865 [RFC2865] and are
amended by RFC 3575 [RFC3575].
10. Security Considerations
This document describes the extension of Diameter for conveying
Quality of Service information. The security considerations of the
Diameter protocol itself have been discussed in RFC 3588 [RFC3588].
Use of the AVPs defined in this document MUST take into consideration
the security issues and requirements of the Diameter Base protocol.
11. References
11.1. Normative References
[I-D.ietf-dime-qos-parameters]
Korhonen, J. and H. Tschofenig, "Quality of Service
Parameters for Usage with the AAA Framework",
draft-ietf-dime-qos-parameters-00 (work in progress),
June 2007.
[I-D.ietf-radext-filter-rules]
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Congdon, P., "RADIUS Attributes for Filtering and
Redirection", draft-ietf-radext-filter-rules-02 (work in
progress), March 2007.
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, March 1997.
[RFC3575] Aboba, B., "IANA Considerations for RADIUS (Remote
Authentication Dial In User Service)", RFC 3575,
July 2003.
[RFC3588] Calhoun, P., Loughney, J., Guttman, E., Zorn, G., and J.
Arkko, "Diameter Base Protocol", RFC 3588, September 2003.
[RFC4005] Calhoun, P., Zorn, G., Spence, D., and D. Mitton,
"Diameter Network Access Server Application", RFC 4005,
August 2005.
[RFC4006] Hakala, H., Mattila, L., Koskinen, J-P., Stura, M., and J.
Loughney, "Diameter Credit-Control Application", RFC 4006,
August 2005.
11.2. Informative References
[I-D.ietf-nsis-qspec]
Ash, J., "QoS NSLP QSPEC Template",
draft-ietf-nsis-qspec-16 (work in progress), March 2007.
[RFC2865] Rigney, C., Willens, S., Rubens, A., and W. Simpson,
"Remote Authentication Dial In User Service (RADIUS)",
RFC 2865, June 2000.
[RFC4072] Eronen, P., Hiller, T., and G. Zorn, "Diameter Extensible
Authentication Protocol (EAP) Application", RFC 4072,
August 2005.
Authors' Addresses
Jouni Korhonen (editor)
TeliaSonera
Teollisuuskatu 13
Sonera FIN-00051
Finland
Email: jouni.korhonen@teliasonera.com
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Hannes Tschofenig
Nokia Siemens Networks
Otto-Hahn-Ring 6
Munich, Bavaria 81739
Germany
Email: Hannes.Tschofenig@nsn.com
URI: http://www.tschofenig.com
Mayutan Arumaithurai
University of Goettingen
Email: mayutan.arumaithurai@gmail.com
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