Diameter Maintenance and J. Korhonen Extensions (DIME) TeliaSonera Internet-Draft J. Bournelle Intended status: Standards Track Orange Labs Expires: August 17, 2008 H. Tschofenig Nokia Siemens Networks C. Perkins K. Chowdhury Starent Networks February 14, 2008 Diameter Mobile IPv6: Support for Network Access Server to Diameter Server Interaction draft-ietf-dime-mip6-integrated-08.txt Status of this Memo By submitting this Internet-Draft, each author represents that any applicable patent or other IPR claims of which he or she is aware have been or will be disclosed, and any of which he or she becomes aware will be disclosed, in accordance with Section 6 of BCP 79. Internet-Drafts are working documents of the Internet Engineering Task Force (IETF), its areas, and its working groups. Note that other groups may also distribute working documents as Internet- Drafts. Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet-Drafts as reference material or to cite them other than as "work in progress." The list of current Internet-Drafts can be accessed at http://www.ietf.org/ietf/1id-abstracts.txt. The list of Internet-Draft Shadow Directories can be accessed at http://www.ietf.org/shadow.html. This Internet-Draft will expire on August 17, 2008. Copyright Notice Copyright (C) The IETF Trust (2008). Korhonen, et al. Expires August 17, 2008 [Page 1] Internet-Draft Diameter MIPv6 NAS to HAAA Interaction February 2008 Abstract A Mobile IPv6 node requires a home agent address, a home address, and a security association with its home agent before it can start utilizing Mobile IPv6. RFC 3775 requires that some or all of these parameters are statically configured. Mobile IPv6 bootstrapping work aims to make this information dynamically available to the Mobile Node. An important aspect of the Mobile IPv6 bootstrapping solution is to support interworking with existing authentication, authorization and accounting infrastructure. This document describes the MIPv6 bootstrapping using the Diameter Network Access Server (NAS) to home Authentication, Authorization and Accounting server (HAAA) interface. Korhonen, et al. Expires August 17, 2008 [Page 2] Internet-Draft Diameter MIPv6 NAS to HAAA Interaction February 2008 Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 4 2. Terminology and Abbreviations . . . . . . . . . . . . . . . . 4 3. Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 4. Commands, AVPs and Advertising Application Support . . . . . . 7 4.1. Advertising Application Support . . . . . . . . . . . . . 7 4.2. Command Codes . . . . . . . . . . . . . . . . . . . . . . 7 4.3. Diameter-EAP-Request (DER) . . . . . . . . . . . . . . . . 8 4.4. Diameter-EAP-Answer (DEA) . . . . . . . . . . . . . . . . 8 4.5. AA-Request (AAR) . . . . . . . . . . . . . . . . . . . . . 9 4.6. AA-Answer (AAA) . . . . . . . . . . . . . . . . . . . . . 9 4.7. Attribute Value Pair Definitions . . . . . . . . . . . . . 10 4.7.1. MIP6-Agent-Info . . . . . . . . . . . . . . . . . . . 10 4.7.2. MIP-Home-Agent-Address AVP . . . . . . . . . . . . . . 11 4.7.3. MIP-Home-Agent-Host AVP . . . . . . . . . . . . . . . 11 4.7.4. MIP6-Home-Link-Prefix AVP . . . . . . . . . . . . . . 11 4.7.5. MIP6-Feature-Vector AVP . . . . . . . . . . . . . . . 11 5. Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 5.1. Home Agent Assignment by the NAS . . . . . . . . . . . . . 13 5.2. Home Agent Assignment by the Diameter Server . . . . . . . 14 5.3. Home Agent Assignment by NAS or Diameter Server . . . . . 14 6. AVP Occurrence Tables . . . . . . . . . . . . . . . . . . . . 16 6.1. AAR, AAA, DER and DEA Commands AVP Table . . . . . . . . . 16 7. MIPv6 Bootstrapping NAS to HAAA Interface AVPs . . . . . . . . 16 8. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 17 8.1. Registration of new AVPs . . . . . . . . . . . . . . . . . 17 8.2. New Registry: Mobility Capability . . . . . . . . . . . . 17 9. Security Considerations . . . . . . . . . . . . . . . . . . . 18 10. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 18 11. References . . . . . . . . . . . . . . . . . . . . . . . . . . 18 11.1. Normative References . . . . . . . . . . . . . . . . . . . 18 11.2. Informative References . . . . . . . . . . . . . . . . . . 19 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 19 Intellectual Property and Copyright Statements . . . . . . . . . . 21 Korhonen, et al. Expires August 17, 2008 [Page 3] Internet-Draft Diameter MIPv6 NAS to HAAA Interaction February 2008 1. Introduction The Mobile IPv6 (MIPv6) specification [1] requires a Mobile Node (MN) to perform registration with a home agent (HA) with information about its current point of attachment (care-of address). The HA creates and maintains binding between the MN's Home Address and the MN's Care-of Address. In order to register with a HA, the MN needs to know some information such as the Home Link prefix, the HA address, the Home Address(es), the Home Link prefix length and security association related information. The aforementioned information may be statically configured. However, static provisioning becomes an administrative burden for an operator. Moreover, it does not address load balancing, failover, opportunistic home link assignment and assignment of local HAs in close proximity to the MN. Also the ability to react to sudden environmental or topological changes is minimal. Static provisioning may not be desirable, in light of these limitations. Dynamic assignment of MIPv6 home registration information is a desirable feature for ease of deployment and network maintenance. For this purpose, the AAA infrastructure, which is used for access authentication, can be leveraged to assign some or all of the necessary parameters. The Diameter server in Access Service Provider's (ASP) or in Mobility Service Provider's (MSP) network may return these parameters to the AAA client. Regarding the bootstrapping procedures, the AAA client might either be the NAS, in case of the integrated scenario, or the HA, in case of the split scenario [7]. The terms integrated and split are described in the terminology section and were introduced in [8] and [9]. 2. Terminology and Abbreviations 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 RFC2119 [2]. General mobility terminology can be found in [10]. The following additional terms, as defined in [8], are used in this document: Access Service Authorizer (ASA): A network operator that authenticates a MN and establishes the MN's authorization to receive Internet service. Korhonen, et al. Expires August 17, 2008 [Page 4] Internet-Draft Diameter MIPv6 NAS to HAAA Interaction February 2008 Access Service Provider (ASP): A network operator that provides direct IP packet forwarding to and from the MN. Mobility Service Authorizer (MSA): A service provider that authorizes MIPv6 service. Mobility Service Provider (MSP): A service provider that provides MIPv6 service. In order to obtain such service, the MN must be authenticated and authorized to obtain the MIPv6 service. Split scenario: A scenario where the mobility service and the network access service are authorized by different entities. Integrated Scenario: A scenario where the mobility service and the network access service are authorized by the same entity. Network Access Server (NAS): A device that provides an access service for a user to a network. Home AAA (HAAA): An authentication, authorization and accounting server located in user's home network i.e., in the home realm. Local AAA (LAAA): An authentication, authorization and accounting proxy located in the local (ASP) network. Visited AAA (VAAA): An authentication, authorization and accounting proxy located in a visited network i.e., in the visited realm. In a roaming case, the local Diameter proxy has the VAAA role. Korhonen, et al. Expires August 17, 2008 [Page 5] Internet-Draft Diameter MIPv6 NAS to HAAA Interaction February 2008 3. Overview This document addresses the authentication, authorization and accounting functionality required for the MIPv6 bootstrapping solutions outlined in [8] and focuses on the Diameter based AAA functionality for the NAS to HAAA communication. In the integrated scenario MIPv6 bootstrapping is provided as part of the network access authentication procedure. Figure 1 shows the participating entities. +---------------------------+ +-----------------+ |Access Service Provider | |ASA/MSA/(MSP) | |(Mobility Service Provider)| | | | | | | | +--------+ | | +--------+ | | |Local | Diameter | | |Home | | | |Diameter|<---------------------->|Diameter| | | |Proxy | (*) | | |Server | | | +--------+ | | +--------+ | | ^ ^ | | ^ | | | | | | |(+) | | | | | | | | | Diameter | | v | | | |(+) +-------+ | | +-------+ | | | | |Home | | | |Home | | | | +-------->|Agent | | | |Agent | | | (*)| |in ASP | | | |in MSP | | | v +-------+ | | +-------+ | +-------+ IEEE | +-----------+ +-------+ | +-----------------+ |Mobile | 802.1X | |NAS/Relay | |DHCPv6 | | |Node |------------|Diameter |---|Server | | | | PANA,... | |Client |(+)| | | +-------+ DHCP | +-----------+ +-------+ | (+) +---------------------------+ Legend: (*): Functionality in scope of this specification (+): Extensions described in other documents. Figure 1: Mobile IPv6 Bootstrapping in the Integrated Scenario In a typical MIPv6 access scenario, a MN is attached to an ASP's network. During the network attachment procedure, the MN interacts with the NAS/Diameter client. Subsequently, the NAS/Diameter client interacts with the Diameter server over the NAS to HAAA interface. Korhonen, et al. Expires August 17, 2008 [Page 6] Internet-Draft Diameter MIPv6 NAS to HAAA Interaction February 2008 When the Diameter server performs the authentication and authorization for the network access it also determines whether the user is authorized to the MIPv6 service. Based on the MIPv6 service authorization and user's policy profile, the Diameter server may return several MIPv6 bootstrapping related parameters to the NAS. The NAS to HAAA interface described in this document is not tied to DHCPv6 as the only mechanism to convey MIPv6 related configuration parameters from the NAS/Diameter client to the mobile node. 4. Commands, AVPs and Advertising Application Support 4.1. Advertising Application Support This document defines a number of MIPv6 bootstrapping NAS to HAAA interface (integrated scenario) related AVPs. These AVPs can be used with present and future Diameter applications, where permitted by the command ABNF. This document does not define a new application. All examples in this document reuse NASREQ [3] and EAP [4] applications. 4.2. Command Codes This document shows re-use of the Diameter NASREQ application [3] and the EAP application commands [4] as an example of the MIPv6 bootstrapping NAS to HAAA interface. The following commands are used to carry MIPv6 related bootstrapping AVPs: Command-Name Abbrev. Code Reference Application Diameter-EAP-Request DER 268 RFC 4072 EAP Diameter-EAP-Answer DEA 268 RFC 4072 EAP AA-Request AAR 265 RFC 4005 NASREQ AA-Answer AAA 265 RFC 4005 NASREQ Figure 2: MIPv6 Bootstrapping NAS to HAAA Interface Command Codes When the Re-Auth-Request (RAR), Re-Auth-Answer (RAA), Session- Termination-Request (STR), Session-Termination-Answer (STA), Abort- Session-Request (ASR), Abort-Session-Answer (ASA), Accounting-Request (ACR), and Accounting-Answer (ACA) commands are used together with the MIPv6 bootstrapping NAS to HAAA interface, they follow the rules defined in RFC 3588 [5] and the rules for the specific Diameter application the AVPs defined in this document are used with. The accounting commands use the Application Identifier value of 3 (Diameter Base Accounting); the others use 0 (Diameter Common Korhonen, et al. Expires August 17, 2008 [Page 7] Internet-Draft Diameter MIPv6 NAS to HAAA Interaction February 2008 Messages). All request messages SHOULD contain the User-Name AVP containing the identity of the MN in NAI format. It is out of scope how the NAS finds out the MN identity. The NAS could, for example, use the MN identity provided by the network access authentication mechanism. 4.3. Diameter-EAP-Request (DER) The Diameter-EAP-Request (DER) message [4], indicated by the Command- Code field set to 268 and the 'R' bit set in the Command Flags field, is sent by the NAS to the Diameter server to initiate a network access authentication and authorization procedure. The DER message format is the same as defined in [4]. The message MAY include optional MIPv6 bootstrapping AVPs: ::= < Diameter Header: 268, REQ, PXY > < Session-Id > { Auth-Application-Id } { Origin-Host } { Origin-Realm } { Destination-Realm } { Auth-Request-Type } * [ MIP6-Agent-Info ] * [ MIP6-Home-Link-Prefix ] [ MIP6-Feature-Vector ] [ User-Name ] [ Destination-Host ] ... * [ AVP ] 4.4. Diameter-EAP-Answer (DEA) The Diameter-EAP-Answer (DEA) message defined in [4], 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 network access authentication procedure was successful then the response MAY include any set of bootstrapping AVPs. The DEA message format is the same as defined in [4] with an addition of optional MIPv6 bootstrapping AVPs: Korhonen, et al. Expires August 17, 2008 [Page 8] Internet-Draft Diameter MIPv6 NAS to HAAA Interaction February 2008 ::= < Diameter Header: 268, PXY > < Session-Id > { Auth-Application-Id } { Auth-Request-Type } { Result-Code } { Origin-Host } { Origin-Realm } * [ MIP6-Agent-Info ] * [ MIP6-Home-Link-Prefix ] [ MIP6-Feature-Vector ] [ User-Name ] ... * [ AVP ] 4.5. AA-Request (AAR) The AA-Request (AAR) message [3], indicated by the Command-Code field set to 265 and 'R' bit set in the Command Flags field, is sent by the NAS to the Diameter server to initiate a network access authentication and authorization procedure. The AAR message format is the same as defined in [3]. The message MAY include optional MIPv6 bootstrapping AVPs: ::= < Diameter Header: 265, REQ, PXY > < Session-Id > { Auth-Application-Id } { Origin-Host } { Origin-Realm } { Destination-Realm } { Auth-Request-Type } * [ MIP6-Agent-Info ] * [ MIP6-Home-Link-Prefix ] [ MIP6-Feature-Vector ] [ User-Name ] [ Destination-Host ] ... * [ AVP ] 4.6. 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 MIPv6 HA bootstrapping. If the network access Korhonen, et al. Expires August 17, 2008 [Page 9] Internet-Draft Diameter MIPv6 NAS to HAAA Interaction February 2008 authentication procedure was successful then the response MAY include any set of bootstrapping AVPs. The AAA message format is the same as defined in [3] with an addition of optional MIPv6 bootstrapping AVPs: ::= < Diameter Header: 265, PXY > < Session-Id > { Auth-Application-Id } { Auth-Request-Type } { Result-Code } { Origin-Host } { Origin-Realm } * [ MIP6-Agent-Info ] * [ MIP6-Home-Link-Prefix ] [ MIP6-Feature-Vector ] [ User-Name ] ... * [ AVP ] 4.7. Attribute Value Pair Definitions 4.7.1. MIP6-Agent-Info The MIP6-Agent-Info AVP (AVP code TBD) is type of Grouped and contains necessary information to assign a HA to the MN. When the MIP6-Agent-Info AVP is present in a message, it MUST contain either the MIP-Home-Agent-Address AVP or the MIP-Home-Agent-Host AVP, or both AVPs. The grouped AVP has the following grammar: ::= < AVP Header: TBD > [ MIP-Home-Agent-Address ] [ MIP-Home-Agent-Host ] * [ AVP ] If both MIP-Home-Agent-Address and MIP-Home-Agent-Host APVs are present in the MIP6-Agent-Info, the MIP-Home-Agent-Address SHOULD have a precedence over the MIP-Home-Agent-Host. The reason for this recommendation is that the MIP-Home-Agent-Address points to a specific home agent, where as the MIP-Home-Agent-Host may point to a group of HAs located at within the same realm. A Diameter client or an agent may use the MIP-Home-Agent-Host AVP, for instance, to find out the realm where the HA is located. This AVP MAY also be attached by the NAS or by intermediating Diameter proxies in a request message when sent to the Diameter Korhonen, et al. Expires August 17, 2008 [Page 10] Internet-Draft Diameter MIPv6 NAS to HAAA Interaction February 2008 server as a hint of a locally assigned HA. This AVP MAY also be attached by the intermediating Diameter proxies in a reply message from the Diameter server, if locally assigned HAs are authorized by the Diameter server. 4.7.2. MIP-Home-Agent-Address AVP The MIP-Home-Agent-Address AVP (AVP Code 334 [6]) is of type Address and contains the HA address. The Diameter server MAY decide to assign a HA to the MN that is in close proximity to the point of attachment (e.g., determined by the NAS-Identifier AVP). There may be other reasons for dynamically assigning HAs to the MN, for example to share the traffic load. 4.7.3. MIP-Home-Agent-Host AVP The MIP-Home-Agent-Host AVP (AVP Code 348 [6]) is of type Grouped and contains the identity of the assigned HA. Both the Destination-Realm and the Destination-Host AVP of the HA are included in the grouped AVP. The usage of this AVP is equivalent to the MIP-Home-Agent- Address AVP but offers an additional level of indirection by using the DNS infrastructure. Depending on the actual deployment and DNS configuration the Destination-Host AVP MAY represent one or more home agents. It is RECOMMENDED that the Destination-Host AVP identifies exactly one HA. 4.7.4. MIP6-Home-Link-Prefix AVP The MIP6-Home-Link-Prefix AVP (AVP Code TBD) is of type OctetString and contains the Mobile IPv6 home network prefix information in network byte order. The home network prefix MUST be encoded as the 8-bit prefix length information followed by the 128-bit field for the available home network prefix. 4.7.5. MIP6-Feature-Vector AVP The MIP6-Feature-Vector AVP (AVP Code TBD) is of type Unsigned64 and contains a 64 bit flags field of supported capabilities of the NAS/ ASP. Sending and receiving the MIP6-Feature-Vector AVP with value 0 MUST be supported, although that does not provide much guidance about specific needs of bootstrapping. The NAS MAY include this AVP to indicate capabilities of the NAS/ASP to the Diameter server. For example, the NAS may indicate that a local HA can be provided. Similarly, the Diameter server MAY include this AVP to inform the NAS/ASP about which of the NAS/ASP indicated capabilities are supported or authorized by the ASA/MSA(/MSP). Korhonen, et al. Expires August 17, 2008 [Page 11] Internet-Draft Diameter MIPv6 NAS to HAAA Interaction February 2008 The following capabilities are defined in this document: MIP6_INTEGRATED (0x0000000000000001) When this flag is set by the NAS then it means that the Mobile IPv6 integrated scenario bootstrapping functionality is supported by the NAS. When this flag is set by the Diameter server then the Mobile IPv6 integrated scenario bootstrapping is supported by the Diameter server. LOCAL_HOME_AGENT_ASSIGNMENT (0x0000000000000002) When this flag is set in the request message, a local home agent outside the home realm is requested and may be assigned to the MN. When this flag is set by the Diameter server in the answer message, then the assignment of local HAs is authorized by the Diameter server. A local HA may be assigned by the NAS, LAAA or VAAA depending on the network architecture and the deployment. The following examples show how the LOCAL_HOME_AGENT_ASSIGNMENT capability and the MIP-Agent-Info AVP are used to assign HAs, either a local HA (L-HA) or a home network HA (H-HA). Below is an example of a request message combinations as seen by the HAAA: LOCAL-bit HA-Info Meaning 0 - ASP or [LV]AAA is not able to assign a L-HA 0 L-HA Same as above. HA-Info must be ignored 1 - ASP or [LV]AAA can/wishes to assign a L-HA 1 L-HA Same as above but ASP or [LV]AAA also provides a hint of the assigned L-HA Then the same as above for an answer message combinations as seen by the NAS: LOCAL-bit HA-Info Meaning 0 - No HA allowed -> no mobility 0 H-HA L-HA is not allowed. HAAA assigns a H-HA 1 - L-HA is allowed. No HAAA or [LV]AAA assigned HA 1 L-HA L-HA is allowed. [LV]AAA also assigns a L-HA 1 H-HA L-HA is allowed. HAAA also assigns a HA 1 H-HA L-HA is allowed. HAAA assigns a H-HA and + L-HA [LV]AAA also assigns also a L-HA Korhonen, et al. Expires August 17, 2008 [Page 12] Internet-Draft Diameter MIPv6 NAS to HAAA Interaction February 2008 5. Examples 5.1. Home Agent Assignment by the NAS In this scenario we consider the case where the NAS wishes to allocate a local HA to the MN. The NAS will also inform the Diameter server about the HA address it has assigned to the visiting MN (e.g., 2001:db8:1:c020::1). The Diameter-EAP-Request message therefore has the MIP6-Feature-Vector with the LOCAL_HOME_AGENT_ASSIGNMENT and the MIP6_INTEGRATED set. The MIP6-Agent-Info AVP contains the MIP-Home- Agent-Address AVP with the address of the proposed HA. Diameter NAS Server | | | Diameter-EAP-Request | | MIP6-Feature-Vector=(LOCAL_HOME_AGENT_ASSIGNMENT | | | MIP6_INTEGRATED) | | MIP6-Agent-Info{ | | MIP-Home-Agent-Address(2001:db8:1:c020::1)} | | } | | Auth-Request-Type=AUTHORIZE_AUTHENTICATE | | EAP-Payload(EAP Start) | |---------------------------------------------------------------->| | | | | : ...more EAP Request/Response pairs... : | | | | | Diameter-EAP-Answer | | MIP6-Feature-Vector=(LOCAL_HOME_AGENT_ASSIGNMENT | | | MIP6_INTEGRATED) | | Result-Code=DIAMETER_SUCCESS | | EAP-Payload(EAP Success) | | EAP-Master-Session-Key | | (authorization AVPs) | | ... | |<----------------------------------------------------------------| | | Figure 3: Home Agent Assignment by NAS Depending on the Diameter server configuration and user's subscription profile, the Diameter server either accepts or rejects the proposal of locally HA allocated by the NAS will be used. In our example, the Diameter server accepts the proposal and the the MIP6- Feature-Vector AVP with LOCAL_HOME_AGENT_ASSIGNMENT flag (together Korhonen, et al. Expires August 17, 2008 [Page 13] Internet-Draft Diameter MIPv6 NAS to HAAA Interaction February 2008 with the MIP6_INTEGRATED flag) is set and returned to the NAS. 5.2. Home Agent Assignment by the Diameter Server In this scenario we consider the case where the NAS supports the Diameter MIPv6 integrated scenario as defined in this document but does not offer local HA assignment. Hence, the MIP6-Feature-Vector AVP only has the MIP6_INTEGRATED flag set. The Diameter server allocates a HA to the mobile node and conveys the address in the MIP- Home-Agent-Address AVP that is encapsulated in the MIP6-Agent-Info AVP. Additionally, the MIP6-Feature-Vector AVP has the MIP6_INTEGRATED flag set. Diameter NAS Server | | | Diameter-EAP-Request | | MIP6-Feature-Vector=(MIP6_INTEGRATED) | | Auth-Request-Type=AUTHORIZE_AUTHENTICATE | | EAP-Payload(EAP Start) | |---------------------------------------------------------------->| | | | | : ...more EAP Request/Response pairs... : | | | | | Diameter-EAP-Answer | | MIP6-Agent-Info{ | | MIP-Home-Agent-Address(2001:db8:6000:302::1/64) | | } | | MIP6-Feature-Vector=(MIP6_INTEGRATED) | | Result-Code=DIAMETER_SUCCESS | | EAP-Payload(EAP Success) | | EAP-Master-Session-Key | | (authorization AVPs) | | ... | |<----------------------------------------------------------------| | | Figure 4: Home Agent Assignment by Diameter Server 5.3. Home Agent Assignment by NAS or Diameter Server This section shows a message flow for the MIPv6 integrated scenario bootstrapping where the NAS informs the Diameter server that it is able to locally assign a HA to the MN. The Diameter server is able to provide a HA to the MN but also authorizes the assignment of local Korhonen, et al. Expires August 17, 2008 [Page 14] Internet-Draft Diameter MIPv6 NAS to HAAA Interaction February 2008 HA. The Diameter server then replies to the NAS with HA related bootstrapping information. Whether the NAS/ASP then offers a locally assigned HA or the Diameter server assigned HA to the MN is, in this example, based on the local ASP policy. Diameter NAS Server | | | Diameter-EAP-Request | | MIP6-Feature-Vector=(LOCAL_HOME_AGENT_ASSIGNMENT | | | MIP6_INTEGRATED) | | MIP6-Agent-Info{ | | MIP-Home-Agent-Address(2001:db8:1:c020::1)} | | } | | Auth-Request-Type=AUTHORIZE_AUTHENTICATE | | EAP-Payload(EAP Start) | |---------------------------------------------------------------->| | | | | : ...more EAP Request/Response pairs... : | | | | | Diameter-EAP-Answer | | MIP6-Agent-Info{ | | MIP-Home-Agent-Address(2001:db8:6000:302::1/64)} | | MIP6-Feature-Vector=(LOCAL_HOME_AGENT_ASSIGNMENT | | | MIP6_INTEGRATED) | | Result-Code=DIAMETER_SUCCESS | | EAP-Payload(EAP Success) | | EAP-Master-Session-Key | | (authorization AVPs) | | ... | |<----------------------------------------------------------------| | | Figure 5: Home Agent Assignment by NAS or Diameter Server If the Diameter server does not accept locally assigned HA, the Diameter returns the MIP6-Feature-Vector AVP with LOCAL_HOME_AGENT_ASSIGNMENT bit unset and HA address it plans to allocate for the MN. Korhonen, et al. Expires August 17, 2008 [Page 15] Internet-Draft Diameter MIPv6 NAS to HAAA Interaction February 2008 6. AVP Occurrence Tables 6.1. AAR, AAA, DER and DEA Commands AVP Table The following table lists the additional MIPv6 bootstrapping NAS to HAAA interface AVPs that may optionally be present in the AAR and AAA Commands [3] or in the DER and DEA Commands [4]. +-----------------------+ | Command-Code | |-----+-----+-----+-----+ Attribute Name | AAR | AAA | DER | DEA | -------------------------------|-----+-----|-----+-----+ MIP6-Agent-Info | 0+ | 0+ | 0+ | 0+ | MIP6-Feature-Vector | 0-1 | 0-1 | 0-1 | 0-1 | MIP6-Home-Link-Prefix | 0+ | 0+ | 0+ | 0+ | +-----+-----+-----+-----+ Figure 6: AAR, AAA, DER and DEA Commands AVP Table 7. MIPv6 Bootstrapping NAS to HAAA Interface AVPs This section defines AVPs that are specific to Diameter MIPv6 bootstrapping NAS to HAAA interface and MAY be included in the Diameter EAP [4] and the NASREQ [3] application messages. The Diameter AVP rules are defined in the Diameter Base [5], Section 4. These AVP rules are observed in AVPs defined in this section. The following table describes the Diameter AVPs, their AVP Code values, types, possible flag values, and whether the AVP MAY be encrypted. The Diameter base [5] specifies the AVP Flag rules for AVPs in Section 4.5. Korhonen, et al. Expires August 17, 2008 [Page 16] Internet-Draft Diameter MIPv6 NAS to HAAA Interaction February 2008 +---------------------+ | AVP Flag rules | +----+-----+----+-----+----+ AVP Section | | |SHLD|MUST | | Attribute Name Code Defined Data Type |MUST| MAY |NOT |NOT |Encr| ------------------------------------------+----+-----+----+-----+----+ MIP6-Agent-Info TBD 4.7.1 Grouped | | P | | V,M | Y | MIP-Home-Agent- | | | | | | Address 334 4.7.2 Address | | P | | V,M | Y | MIP-Home-Agent- | | | | | | Host 348 4.7.3 Grouped | | P | | V,M | Y | MIP6-Feature- | | | | | | Vector TBD 4.7.5 Unsigned64 | | P | | V,M | Y | MIP6-Home-Link- TBD 4.7.4 OctetString| | P | | V,M | Y | Prefix | | | | | | ------------------------------------------+----+-----+----+-----+----+ Figure 7: AVP Flag Rules Table 8. IANA Considerations 8.1. Registration of new AVPs This specification defines the following new AVPs: MIP6-Agent-Info is set to TBD MIP6-Feature-Vector is set to TBD MIP6-Home-Link-Prefix is set to TBD 8.2. New Registry: Mobility Capability IANA is requested to create a new registry for the Mobility Capability as described in Section 4.7.5. Token | Value | Description ----------------------------------+----------------------+------------ MIP6_INTEGRATED | 0x0000000000000001 | [RFC TBD] LOCAL_HOME_AGENT_ASSIGNMENT | 0x0000000000000002 | [RFC TBD] Available for Assignment via IANA | 2^x | Allocation rule: Only numeric values that are 2^x (power of two) are allowed based on the allocation policy described below. Following the policies outlined in [1] new values with a description of their semantic for usage with the MIP6-Feature-Vector AVP together with a Token will be assigned after Expert Review initiated by the O&M Area Directors in consultation with the DIME working group chairs Korhonen, et al. Expires August 17, 2008 [Page 17] Internet-Draft Diameter MIPv6 NAS to HAAA Interaction February 2008 or the working group chairs of a designated successor working group. Updates can be provided based on expert approval only. A designated expert will be appointed by the O&M Area Directors. No mechanism to mark entries as "deprecated" is envisioned. Based on expert approval it is possible to delete entries from the registry. 9. Security Considerations The security considerations for the Diameter interaction required to accomplish the integrated scenario are described in [11]. Additionally, the security considerations of the Diameter base protocol [5], Diameter NASREQ application [3] / Diameter EAP [4] application (with respect to network access authentication and the transport of keying material) are applicable to this document. This document does not introduce new security vulnerabilities. 10. Acknowledgements This document is heavily based on the ongoing work for RADIUS MIPv6 interaction. Hence, credits go to respective authors for their work with draft-ietf-mip6-radius. Furthermore, the author would like to thank the authors of draft-le-aaa-diameter-mobileipv6 (Franck Le, Basavaraj Patil, Charles E. Perkins, Stefano Faccin) for their work in context of MIPv6 Diameter interworking. Their work influenced this document. Jouni Korhonen would like to thank Academy of Finland and TEKES MERCoNe Project for providing funding to work on this document. Julien Bournelle would like to thank GET/INT since he began to work on this document while he was in their employ. Authors would also like to acknowledge Raymond Hsu for his valuable feedback on local HA assignment and Wolfgang Fritsche for his thorough review. Finally, we would like to Domagoj Premec for his review comments. We would like to thank Alper Yegin, Robert Marks, David Frascone for their comments at the second WGLC. 11. References 11.1. Normative References [1] Johnson, D., Perkins, C., and J. Arkko, "Mobility Support in IPv6", RFC 3775, June 2004. [2] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, March 1997. Korhonen, et al. Expires August 17, 2008 [Page 18] Internet-Draft Diameter MIPv6 NAS to HAAA Interaction February 2008 [3] Calhoun, P., Zorn, G., Spence, D., and D. Mitton, "Diameter Network Access Server Application", RFC 4005, August 2005. [4] Eronen, P., Hiller, T., and G. Zorn, "Diameter Extensible Authentication Protocol (EAP) Application", RFC 4072, August 2005. [5] Calhoun, P., Loughney, J., Guttman, E., Zorn, G., and J. Arkko, "Diameter Base Protocol", RFC 3588, September 2003. [6] Calhoun, P., Johansson, T., Perkins, C., Hiller, T., and P. McCann, "Diameter Mobile IPv4 Application", RFC 4004, August 2005. 11.2. Informative References [7] Giaretta, G., Kempf, J., and V. Devarapalli, "Mobile IPv6 Bootstrapping in Split Scenario", RFC 5026, October 2007. [8] Patel, A. and G. Giaretta, "Problem Statement for bootstrapping Mobile IPv6 (MIPv6)", RFC 4640, September 2006. [9] Giaretta, G., Guardini, I., Demaria, E., Bournelle, J., and R. Lopez, "AAA Goals for Mobile IPv6", draft-ietf-mext-aaa-ha-goals-00 (work in progress), December 2007. [10] Manner, J. and M. Kojo, "Mobility Related Terminology", RFC 3753, June 2004. [11] Chowdhury, K. and A. Yegin, "MIP6-bootstrapping for the Integrated Scenario", draft-ietf-mip6-bootstrapping-integrated-dhc-05 (work in progress), July 2007. Authors' Addresses Jouni Korhonen TeliaSonera Teollisuuskatu 13 Sonera FIN-00051 Finland Email: jouni.korhonen@teliasonera.com Korhonen, et al. Expires August 17, 2008 [Page 19] Internet-Draft Diameter MIPv6 NAS to HAAA Interaction February 2008 Julien Bournelle Orange Labs 38-4O rue du general Leclerc Issy-Les-Moulineaux 92794 France Email: julien.bournelle@orange-ftgroup.com Hannes Tschofenig Nokia Siemens Networks Linnoitustie 6 Espoo 02600 Finland Phone: +358 (50) 4871445 Email: Hannes.Tschofenig@nsn.com URI: http://www.tschofenig.com Charles E. Perkins Phone: +1-650-496-4402 Email: charliep@computer.org Kuntal Chowdhury Starent Networks 30 International Place Tewksbury MA 01876 US Phone: +1 214 550 1416 Email: kchowdhury@starentnetworks.com Korhonen, et al. Expires August 17, 2008 [Page 20] Internet-Draft Diameter MIPv6 NAS to HAAA Interaction February 2008 Full Copyright Statement Copyright (C) The IETF Trust (2008). This document is subject to the rights, licenses and restrictions contained in BCP 78, and except as set forth therein, the authors retain all their rights. 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Information on the procedures with respect to rights in RFC documents can be found in BCP 78 and BCP 79. Copies of IPR disclosures made to the IETF Secretariat and any assurances of licenses to be made available, or the result of an attempt made to obtain a general license or permission for the use of such proprietary rights by implementers or users of this specification can be obtained from the IETF on-line IPR repository at http://www.ietf.org/ipr. The IETF invites any interested party to bring to its attention any copyrights, patents or patent applications, or other proprietary rights that may cover technology that may be required to implement this standard. Please address the information to the IETF at ietf-ipr@ietf.org. Acknowledgment Funding for the RFC Editor function is provided by the IETF Administrative Support Activity (IASA). Korhonen, et al. Expires August 17, 2008 [Page 21]