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Versions: (draft-korhonen-dime-pmip6) 00 01 02 03 04 RFC 5779

Diameter Maintenance and                                J. Korhonen, Ed.
Extensions (DIME)                                  Nokia Siemens Network
Internet-Draft                                              J. Bournelle
Intended status: Standards Track                             Orange Labs
Expires: July 18, 2009                                        A. Muhanna
                                                                  Nortel
                                                            K. Chowdhury
                                                        Starent Networks
                                                                U. Meyer
                                                             RWTH Aachen
                                                        January 14, 2009


Diameter Proxy Mobile IPv6: Support For Mobile Access Gateway and Local
             Mobility Anchor to Diameter Server Interaction
                      draft-ietf-dime-pmip6-00.txt

Status of this Memo

   This Internet-Draft is submitted to IETF in full conformance with the
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   This Internet-Draft will expire on July 18, 2009.

Copyright Notice

   Copyright (c) 2009 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of



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   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.

Abstract

   This specification defines the Diameter support for the Proxy Mobile
   IPv6 and the corresponding mobility service session setup.  The
   policy information needed by the Proxy Mobile IPv6 is defined in
   mobile node's policy profile, which could be downloaded from the
   Diameter server to the Mobile Access Gateway once the mobile node
   roams into a Proxy Mobile IPv6 Domain and performs access
   authentication.






































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Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  4
   2.  Terminology and Abbreviations  . . . . . . . . . . . . . . . .  4
   3.  Solution Overview  . . . . . . . . . . . . . . . . . . . . . .  5
   4.  Attribute Value Pair Definitions . . . . . . . . . . . . . . .  7
     4.1.  MIP6-Agent-Info AVP  . . . . . . . . . . . . . . . . . . .  7
     4.2.  PMIP6-IPv4-Home-Address AVP  . . . . . . . . . . . . . . .  7
     4.3.  PMIP6-DHCP-Address AVP . . . . . . . . . . . . . . . . . .  8
     4.4.  PMIP6-Home-Prefix AVP  . . . . . . . . . . . . . . . . . .  8
     4.5.  MIP6-Feature-Vector AVP  . . . . . . . . . . . . . . . . .  8
     4.6.  Mobile-Node-Identifier AVP . . . . . . . . . . . . . . . .  9
     4.7.  Calling-Station-Id AVP . . . . . . . . . . . . . . . . . . 10
     4.8.  Service-Selection AVP  . . . . . . . . . . . . . . . . . . 10
     4.9.  Session-Timeout AVP  . . . . . . . . . . . . . . . . . . . 10
   5.  MAG to HAAA Interface Application Support  . . . . . . . . . . 10
     5.1.  Application Support and Command Codes  . . . . . . . . . . 10
     5.2.  Accounting at MAG  . . . . . . . . . . . . . . . . . . . . 11
   6.  LMA to HAAA Interface Application Support  . . . . . . . . . . 11
     6.1.  Application Support and Command Codes  . . . . . . . . . . 11
     6.2.  Authorization of the Proxy Binding Update  . . . . . . . . 11
       6.2.1.  LHA-Request  . . . . . . . . . . . . . . . . . . . . . 12
       6.2.2.  LHA-Answer . . . . . . . . . . . . . . . . . . . . . . 13
     6.3.  Accounting at LMA  . . . . . . . . . . . . . . . . . . . . 14
   7.  Proxy Mobile IPv6 Session Management . . . . . . . . . . . . . 14
     7.1.  Session-Termination-Request  . . . . . . . . . . . . . . . 15
     7.2.  Session-Termination-Answer . . . . . . . . . . . . . . . . 15
     7.3.  Abort-Session-Request  . . . . . . . . . . . . . . . . . . 15
     7.4.  Abort-Session-Answer . . . . . . . . . . . . . . . . . . . 15
   8.  Attribute Value Pair Occurrence Tables . . . . . . . . . . . . 15
     8.1.  MAG to HAAA Interface  . . . . . . . . . . . . . . . . . . 15
     8.2.  LMA to HAAA Interface  . . . . . . . . . . . . . . . . . . 17
   9.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . . 17
     9.1.  Attribute Value Pair Codes . . . . . . . . . . . . . . . . 17
     9.2.  Namespaces . . . . . . . . . . . . . . . . . . . . . . . . 17
     9.3.  Application Identifiers  . . . . . . . . . . . . . . . . . 18
     9.4.  Command Codes  . . . . . . . . . . . . . . . . . . . . . . 18
     9.5.  Result-Code AVP Values . . . . . . . . . . . . . . . . . . 18
   10. Security Considerations  . . . . . . . . . . . . . . . . . . . 18
   11. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 19
   12. References . . . . . . . . . . . . . . . . . . . . . . . . . . 19
     12.1. Normative References . . . . . . . . . . . . . . . . . . . 19
     12.2. Informative References . . . . . . . . . . . . . . . . . . 19
   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 20







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1.  Introduction

   In the Proxy Mobile IPv6 (PMIPv6) protocol [RFC5213] and its IPv4
   support [I-D.ietf-netlmm-pmip6-ipv4-support] a Mobile Access Gateway
   (MAG) performs a proxy registration with a Local Mobility Anchor
   (LMA) on behalf of the mobile node (MN).  In order to perform the
   proxy registration the PMIPv6 MAG needs the address of the LMA,
   possibly MN's home network prefix (MN-HNP), possibly MN's IPv4 home
   address (IPv4-HoA), DHCP server address and other PMIPv6 specific
   information such as allowed address configuration modes and possible
   roaming related policies.  All this information is defined in MN's
   policy profile that gets downloaded from the Diameter server to the
   MAG once the MN roams into a Proxy Mobile IPv6 Domain (PMIPv6-Domain)
   and performs the access authentication.

   Dynamic assignment and downloading of PMIPv6 policy profile
   information is a desirable feature to ease the deployment and network
   maintenance of larger PMIPv6 deployments.  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 the Mobility Service authorizer's (MSA) or in the
   Mobility Service Provider's (MSP) network may return these parameters
   to the Network Access Server (NAS).

   Once the MN authenticates to the network the MAG sends a Proxy
   Binding Update (PBU) towards the LMA on behalf of the MN.  Upon
   arrival of the PBU the LMA needs to interact with the Diameter server
   and fetch the MN's policy related information that was already
   partially downloaded to the MAG.

   This specification defines the Diameter support for the PMIPv6 and
   the corresponding mobility service session setup.  In the context of
   this specification the location of the subscriber policy profile
   equals to the home Diameter server, which is also referred as the
   home AAA server (HAAA).  The NAS functionality of the MAG may be co-
   located or an integral part of the MAG.  The access authentication
   procedure into a PMIPv6-Domain resembles the Mobile IPv6 integrated
   scenario bootstrapping [I-D.ietf-dime-mip6-integrated].  The
   assumption is that the Access Service Authenticator (ASA) is the same
   entity as the MSA/MSP.  This specification leverages the work already
   done for the Mobile IPv6 integrated scenario bootstrapping
   [I-D.ietf-dime-mip6-integrated].


2.  Terminology and Abbreviations

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this



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   document are to be interpreted as described in RFC2119 [RFC2119].

   General mobility terminology can be found in [RFC3753].  The
   following additional or clarified terms are used in this document:

   Network Access Server (NAS):

      A device that provides an access service for a user to a network.
      In the context of this document the NAS may be integrated into or
      co-located to a MAG.  The NAS contains a Diameter client function.

   Home AAA (HAAA):

      An authentication, authorization and accounting server located in
      user's home network.  A HAAA is essentially a Diameter server.



3.  Solution Overview

   This document addresses the authentication, authorization, accounting
   and session management functionality needed by the PMIPv6 protocol.
   This document defines Diameter based interfaces between the PMIPv6
   two entities, MAG and HAAA, to the HAAA.  The intention of this
   document is only to extend existing Diameter Mobile IPv6
   specifications such as [I-D.ietf-dime-mip6-integrated] and define the
   needed additional AVPs and functionality to fully support PMIPv6
   deployment.

   The policy profile download from the HAAA to the MAG is part of the
   network access authentication procedure when a MN roams into or
   within a PMIPv6 Domain.  Figure 1 shows the participating network
   entities.  This document, however, only concentrates on the MAG, LMA,
   possible local Diameter proxies and the home Diameter server.  When
   aligned with [I-D.ietf-dime-mip6-integrated] the MAG acts as the NAS
   located in ASP, the HAAA acts as the Diameter server located in ASA/
   MSA/MSP and the LMA acts as the HA in ASP/MSP.














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    +--------+
    | HAAA & | Diameter +-----+
    | Policy |<---(1)-->| LMA |
    | Profile|          +-----+
    +--------+             | <--- LMA-Address
         ^                 |
         |               // \\
     +---|------------- //---\\----------------+
    (    |  IPv4/IPv6  //     \\                )
    (    |   Network  //       \\               )
     +---|-----------//---------\\-------------+
         |          //           \\
     Diameter      // <- Tunnel1  \\ <- Tunnel2
        (2)       //               \\
         |        |- MAG-Address1   |- MAG-Address2
         |     +----+             +----+
         +---->|MAG1|             |MAG2|
               +----+             +----+
                  |                 |
                  |                 |
                [MN1]             [MN2]

     Legend:

       (1): LMA <-> HAAA interaction is described
            in Section 6
       (2): MAG <-> HAAA interaction is described
            in Section 5


   Figure 1: Diameter Proxy Mobile IPv6 Support with MAG to HAAA and LMA
                            to HAAA Interfaces

   In a PMIPv6 access scenario a MN attaches to a PMIPv6-Domain and
   starts a network access authentication procedure.  The choice of the
   authentication mechanism is specific to the access network
   deployment, but could be based on the Extensible Authentication
   Protocol (EAP) [RFC3748].  During the network access authentication
   procedure, the MAG acting as a NAS queries the HAAA through the AAA
   infrastructure using the Diameter protocol.  If the HAAA detects that
   the subscriber is also authorized for the PMIPv6 service, the
   subscriber policy is returned along with the successful network
   access authentication answer to the MAG.

   After the MN access is successfully authenticated, the MAG sends a
   PBU to the LMA.  Upon receiving the PBU the LMA interacts with the
   HAAA and fetches the relevant subscriber policy, authorization and
   security information related to the PMIPv6 session.  This



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   specification assumes that the HAAA is the central node for managing
   everything related to PMIPv6 subscription and session, possibly even
   including the allocation of prefixes.

   Prior to sending the PBU there might be a need to dynamically setup
   the MAG to LMA Security Association (SA), for example using IKEv2/
   IPSec [RFC4306].  The dynamic SA setup procedure may be triggered by
   the MN attaching to the MAG that does not have an existing SA with
   the correspondent LMA.  The details of the dynamic SA setup procedure
   is out of scope of this specification.  However, the SA is between
   the MAG and the corresponding LMA, thus it can be created using any
   security mechanism that is applicable for PMIPv6 security such as
   IKEv2 IPSec with an EAP-based authentication.  It should be noted
   that the identity used by the MAG during the SA creation is the MAG's
   own identity and the credentials are for authenticating the MAG
   toward the LMA and possibly for authorizing the MAG to offer Proxy
   Mobile IPv6 service with the same LMA.


4.  Attribute Value Pair Definitions

   This section describes both new AVPs defined in this specification
   and re-used AVPs that are used in a PMIPv6 specific way.  The AVPs
   described here are applicable for both MAG to HAAA and LMA to HAAA
   interfaces.

4.1.  MIP6-Agent-Info AVP

   The MIP6-Agent-Info grouped AVP is defined in
   [I-D.ietf-dime-mip6-integrated].  This specification reuses the said
   AVP and its sub-AVPs to carry the LMA IP address and/or FQDN.

4.2.  PMIP6-IPv4-Home-Address AVP

   The PMIP6-IPv4-Home-Address AVP (AVP Code TBD) is of type Address and
   contains the IPv4-HoA of the MN.  The primary use of this AVP is to
   carry the IPv4 Home Address, if available, from the HAAA to the MAG.

   The PMIP6-IPv4-Home-Address AVP may also be used on the LMA to HAAA
   interface.  In this scenario the AVP contains the IPv4 Home Address
   the LMA has assigned to the MN.  If the LMA delegates assignment of
   the Home Address to the HAAA, the AVP MUST contain all zeroes address
   (i.e., 0.0.0.0) in the request message.  The answer message SHOULD in
   all cases contain the assigned IPv4 Home Address value.







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4.3.  PMIP6-DHCP-Address AVP

   The PMIP6-DHCP-Address AVP (AVP Code TBD) is of type Address and
   contains the IP address of the DHCPv4 and/or DHCPv6 server assigned
   to the MAG serving the newly attached MN.  If the AVP contains a
   DHCPv4 server address, then the Address type MUST be IPv4.  If the
   AVP contains a DHCPv6 server address, then the Address type MUST be
   IPv6.  The HAAA MAY assign a DHCP server to the MAG in deployments
   where the MAG acts as a DHCP Relay and the DHCP Server is not co-
   located with the LMA [I-D.ietf-netlmm-pmip6-ipv4-support].

4.4.  PMIP6-Home-Prefix AVP

   The PMIP6-Home-Prefix AVP (AVP Code TBD) is of type Address and
   contains the MN-NHP.  The low 64 bits of the IPv6 address MUST be all
   zeroes.  The high 64 bits of the IPv6 address are used as the MN-HNP.
   The primary use of this AVP is to carry the IPv6 Home Network Prefix,
   if available, from the HAAA to the MAG.

   The PMIP6-Home-Prefix AVP may also be used on the LMA to HAAA
   interface.  In this scenario the AVP contains the prefix the LMA has
   assigned to the MN.  If the LMA delegates assignment of the home
   network prefix to the HAAA, the AVP MUST contain all zeroes address
   (i.e., 0::0) in the request message.  The answer message SHOULD in
   all cases contain the assigned home prefix value.

4.5.  MIP6-Feature-Vector AVP

   The MIP6-Feature-Vector AVP is originally defined in
   [I-D.ietf-dime-mip6-integrated].  This document only reserves new
   capability bits according to the rules in
   [I-D.ietf-dime-mip6-integrated].  The new reserved bits contain
   PMIPv6 capability announcement of the MAG and the HAAA(/LMA)).  Using
   the capability announcement it is possible to perform a simple
   capability negotiation between the MAG and the HAAA.  Those
   capabilities that are announced by both parties are also known to be
   mutually supported.  The following capability bits are defined in
   this document:

   PMIP6_SUPPORTED (0x0000010000000000)

      When the MAG/NAS sets this bit in the MIP6-Feature-Vector AVP, it
      is an indication to the HAAA that the NAS supports PMIPv6.  When
      the HAAA sets this bit in the response MIP6-Feature-Vector AVP, it
      indicates that the HAAA also has PMIPv6 support.  This capability
      bit can also be used to allow PMIPv6 mobility support in a
      subscription granularity.




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   IP4_HOA_SUPPORTED (0x0000020000000000)

      Assignment of the IPv4-HoA is supported.  When the MAG sets this
      bit in the MIP6-Feature-Vector AVP, it indicates that the MAG
      implements a minimal functionality of a DHCP server (and a relay)
      and is able to deliver IPv4-HoA to the MN.  When the HAAA sets
      this bit in the response MIP6-Feature-Vector AVP, it indicates
      that the HAAA has authorized the use of IPv4-HoA for the MN.  If
      this bit is unset in the returned MIP6-Feature-Vector AVP, the
      HAAA does not authorize the configuration of IPv4 address.

   LOCAL_MAG_ROUTING_SUPPORTED (0x0000040000000000)

      Direct routing of IP packets between MNs anchored to the same MAG
      is supported.  When a MAG sets this bit in the MIP6-Feature-
      Vector, it indicates that routing IP packets between MNs anchored
      to the same MAG is supported, without reverse tunneling packets
      via the LMA or requiring any Route Optimization related signaling
      (e.g. the Return Routability Procedure in [RFC3775]) prior direct
      routing.  If this bit is unset in the returned MIP6-Feature-Vector
      AVP, the HAAA does not authorize direct routing of packets between
      MNs anchored to the same MAG.  This policy feature MUST be
      supported per MN and subscription basis.


   The MIP6-Feature-Vector AVP is also used on the LMA to HAAA
   interface.  Using the capability announcement AVP it is possible to
   perform a simple capability negotiation between the LMA and the HAAA.
   Those capabilities that are announced by both parties are also known
   to be mutually supported.  The capabilities listed in earlier are
   also supported in the LMA to HAAA interface.  The LMA to HAAA
   interface does not define any new capability values.

4.6.  Mobile-Node-Identifier AVP

   The Mobile-Node-Identifier AVP (AVP Code TBD) is of type UTF8String
   and contains the mobile node identifier (MN-Identifier, see
   [RFC5213]) in a NAI [RFC4282] format.  This AVP is used on the MAG to
   HAAA interface.

   The Mobile-Node-Identifier AVP is returned in the answer message that
   ends a successful authentication (and possibly an authorization)
   exchange between the MAG and the HAAA, assuming the HAAA is also able
   to provide the MAG with the MN-Identifier in the first place.  The
   MAG MUST use the received MN-Identifier, if it has not been able to
   get the mobile node identifier through other means.  If the MAG
   already has a valid mobile node identifier, then the MAG MAY silently
   discard the received MN-identifier.



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4.7.  Calling-Station-Id AVP

   The Calling-Station-Id AVP (AVP Code 31) is of type UTF8String and
   contains a Link-Layer Identifier of the MN.  This identifier may
   correspond to a real physical interface or something that the MAG has
   generated.

4.8.  Service-Selection AVP

   The Service-Selection AVP (AVP Code TBD) is of type UTF8String and
   contains a LMA provided service identifier on the LMA to HAAA
   interface.  The service identifier may be used to assist the PBU
   authorization.  The identifier MUST be unique within the PMIPv6
   domain.  This AVP is re-used from [I-D.ietf-dime-mip6-split].

4.9.  Session-Timeout AVP

   The Session-Timeout AVP (AVP Code 27) is of type Unsigned32 and
   contains lifetime of the Binding Cache Entry in a unit of seconds.


5.  MAG to HAAA Interface Application Support

5.1.  Application Support and Command Codes

   This specification does not define a new Application-ID for the MAG
   to HAAA interface.  Rather, this specification re-uses any Diameter
   application and its commands that are used to authenticate and
   authorize the MN for the network access and mobility service.
   Example applications include NASREQ [RFC4005] and EAP [RFC4072].  The
   MAG acts as a Diameter client.

   The MAG to HAAA interface is primarily used for bootstrapping PMIPv6
   mobility service session when a MN attaches and authenticates to a
   PMIPv6 domain.  This includes the bootstrapping of PMIPv6 session
   related information and possibly PMIPv6 security related information
   retrieval.  The same interface may also be used for accounting.

   Whenever the MAG sends a Diameter request message to the HAAA the
   User-Name AVP MUST contain the MN identity.  At minimum the home
   realm of the MN MUST be available at the MAG when the network access
   authentication takes place.  Otherwise the MAG is not able to route
   the Diameter request messages towards the correct HAAA.  The MN
   identity MUST be in Network Access Identifier (NAI) [RFC4282] format.

   The Diameter response messages MAY contain Framed-IPv6-Prefix and/or
   Framed-IPv4-Address AVPs.  For example a local Diameter proxy MAY add
   those in order to advertise locally available prefixes and addresses



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   as well [I-D.damic-netlmm-pmip6-ind-discover].  It is also possible
   that PMIPv6 mobility support is not allowed for a subscription.  In
   this case, a MAG may still provide normal IP connectivity to the MN
   using, for example, local address pools.

5.2.  Accounting at MAG

   The accounting at the MAG to HAAA interface is based on the
   [RFC4005].  The application identifier used for accounting is the
   Diameter Base Accounting (3) [RFC3588].

   TBD.


6.  LMA to HAAA Interface Application Support

6.1.  Application Support and Command Codes

   The LMA to HAAA interface may be used for multiple purposes.  These
   include the authorization of the incoming PBU, possible PMIPv6
   security related information retrieval, accounting and PMIPv6 session
   management.

   This specification defines a new Application-ID for the LMA to HAAA
   interface and specifically for the authorization of the Proxy Binding
   Updates.  The new application identifier is TBD BY IANA.  The new
   application also defines two new commands and respective Command
   Codes: LHA-Request (value of TBD) and LHA-Answer (value of TBD).  The
   LMA acts as a Diameter client.

6.2.  Authorization of the Proxy Binding Update

   Whenever the LMA sends a Diameter request message to the HAAA, the
   User-Name AVP MUST contain the MN identity.  The identity MUST be in
   a NAI format.  The LMA MAY retrieve the MN identity information from
   the PBU MN-ID [RFC4283][RFC5213] mobility option.  The identity
   SHOULD be the same as used on the MAG to HAAA interface, but in a
   case those identities differ the HAAA MUST have a mechanism of
   mapping the MN identity used on the MAG to HAAA interface to the
   identity used on the LMA to HAAA interface.

   If the PBU contains the MN Link-Layer Identifier option, the Calling-
   Station-Id AVP SHOULD be included in the request message containing
   the received Link-Layer Identifier.  Furthermore, if the PBU contains
   the Service Selection mobility option [RFC5149], the Service-
   Selection AVP SHOULD be included in the request message containing
   the received service identifier.




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   The LMA and the HAAA use the PMIP6-Home-Prefix AVP to exchange the
   MN-HNP when appropriate.  The low 64 bits of the prefix must be all
   zeroes.  Similarly, the LMA and the HAAA use the PMIP6-IPv4-Home-
   Address AVP to exchange the MN IPv4-HoA when appropriate.  If the
   PMIP6-Home-Prefix is set to an all zeroes address (i.e., 0::0) in the
   request message, it is an indication that the HAAA needs to assign
   the MN-HNP and return it to the LMA in the response message.  If the
   PMIP6-IPv4-Home-Address is set to all zeroes (i.e., 0.0.0.0) in the
   request message, it is an indication that the HAAA needs to assign
   the MN IPv4-HoA and return it to the LMA in the response message.

   The Auth-Request-Type AVP MUST be set to the value AUTHORIZE_ONLY.
   If the HAAA is not able to authorize the subscriber's mobility
   service session, then the reply message to the LMA MUST have the
   Result-Code AVP set to value DIAMETER_PMIP6_AUTHORIZATION_FAILED (TBD
   BY IANA) indicating a permanent failure.

   The LMA to HAAA interface can also be used to update the selected LMA
   address to the HAAA.  This applies to the case where the MAG, for
   example, discovers the LMA address using the DNS.

6.2.1.  LHA-Request

   The LHA-Request (LHAR, value of TBD) message is sent by the LMA to
   the Diameter server to initiate a mobility service session
   authorization procedure.  The LHAR message format is defined below:

























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   <LHA-Request> ::= < Diameter Header: TBD, REQ, PXY >
                     < Session-ID >
                     { Auth-Application-Id }
                     { User-Name }
                     { Destination-Realm }
                     { Origin-Host }
                     { Origin-Realm }
                     { Auth-Request-Type }
                     [ Destination-Host ]
                     [ Origin-State-Id ]
                     [ NAS-Identifier ]
                     [ NAS-IP-Address ]
                     [ NAS-IPv6-Address ]
                     [ NAS-Port-Type ]
                     [ Called-Station-Id ]
                     [ Calling-Station-Id ]
                     { MIP6-Feature-Vector }
                     { MIP6-Agent-Info }
                   * [ PMIP6-Home-Prefix ]
                     [ PMIP6-IPv4-Home-Address ]
                     [ Service-Selection ]
                     [ Authorization-Lifetime ]
                     [ Auth-Session-State ]
                   * [ Proxy-Info ]
                   * [ Route-Record ]
                   * [ AVP ]

6.2.2.  LHA-Answer

   The LHA-Answer (LHAA, value of TBD) message is sent in response to
   the LHA-Request (LHAR) message.  If the mobility service session
   authorization procedure was successful then the response MAY include
   PMIPv6 LMA to HAAA interface AVPs.  The PMIP6-Home-Prefix AVP
   contains MN-HNP and the PMIP6-IPv4-Home-Address AVP contains IPv4-
   HoA, if such information are needed.  The LHAA message format is
   defined below:















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   <LHA-Answer> ::= < Diameter Header: TBD, PXY >
                    < Session-Id >
                    { Auth-Application-Id }
                    { Result-Code }
                    { Origin-Host }
                    { Origin-Realm }
                    { Auth-Request-Type }
                    [ User-Name ]
                    [ Authorization-Lifetime ]
                    [ Auth-Session-State ]
                    [ Error-Message ]
                    [ Error-Reporting-Host ]
                    [ Re-Auth-Request-Type ]
                    [ MIP6-Feature-Vector ]
                  * [ PMIP6-Home-Prefix ]
                    [ PMIP6-IPv4-Home-Address ]
                    [ Session-Timeout ]
                    [ Chargeable-User-Identity ]
                    [ Origin-State-Id ]
                  * [ Proxy-Info ]
                  * [ Redirect-Host ]
                    [ Redirect-Host-Usage ]
                    [ Redirect-Max-Cache-Time ]
                  * [ Failed-AVP ]
                  * [ AVP ]

6.3.  Accounting at LMA

   The accounting at the LMA to HAAA interface is based on the
   [RFC4005].  The application identifier used for accounting is the
   Diameter Base Accounting (3) [RFC3588].

   TBD.


7.  Proxy Mobile IPv6 Session Management

   Concerning a PMIPv6 session, the HAAA MAY maintain a state.  The LMA
   and the MAG MUST support the Authorization Session State Machine
   defined in [RFC3588].  Diameter session termination related commands
   described in the following sections may be exchanged between the LMA
   and the HAAA.

   The actual PMIPv6 session termination procedures take place at PMIPv6
   protocol level and are out of scope of this document.






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7.1.  Session-Termination-Request

   The LMA or the MAG MAY send the Session-Termination-Request (STR)
   command [RFC3588] to the HAAA and inform the termination of an
   ongoing PMIPv6 session is in progress.

7.2.  Session-Termination-Answer

   The Session-Termination-Answer (STA) [RFC3588] is sent by the HAAA to
   acknowledge the termination of a PMIPv6 session.

7.3.  Abort-Session-Request

   The HAAA MAY send the Abort-Session-Request (ACR) command [RFC3588]
   to the LMA or to the MAG and request termination of a PMIPv6 session.

7.4.  Abort-Session-Answer

   The Abort-Session-Answer (ASA) command [RFC3588]is sent by the LMA or
   the MAG to acknowledge that the termination of a PMIPv6 session.


8.  Attribute Value Pair Occurrence Tables

   The following tables list the PMIPv6 MAG to HAAA interface and LMA to
   HAAA interface AVPs including those that are defined in
   [I-D.ietf-dime-mip6-integrated].

   The Figure 2 contains the AVPs and their occurrences on the MAG to
   HAAA interface.  The AVPs that are part of grouped AVP are not listed
   in the table, rather only the grouped AVP is listed.

8.1.  MAG to HAAA Interface


















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                                     +---------------+
                                     |  Command-Code |
                                     |-------+-------+
      Attribute Name                 |  REQ  |  ANS  |
      -------------------------------+-------+-------+
      PMIP6-DHCP-Address             |   0   |  0+   |
      MIP6-Agent-Info                |   0   |  0+   |
      MIP6-Feature-Vector            |  0-1  |  0-1  |
      PMIP6-IPv4-Home-Address        |   0   |  0-1  |
      PMIP6-Home-Prefix              |   0   |   0+  |
      Mobile-Node-Identifier         |  0-1  |  0-1  |
      Calling-Station-Id             |  0-1  |   0   |
                                     +-------+-------+

    Figure 2: MAG to HAAA Interface Generic Diameter Request and Answer
                               Commands AVPs

   The following table describes the Diameter AVPs code values, types,
   possible flag values, and whether the AVP MAY be encrypted.  The
   Diameter base protocol specification [RFC3588] specifies the AVP
   Flags rules for AVPs in section 4.5.  Due to space constraints, the
   short form DiamIdent is used to represent DiameterIdentity and
   OctetStr is used to represent OctetString.

                                             +--------------------+
                                             |   AVP Flag rules   |
                                             +----+----+----+-----+----+
                      AVP  Section           |    |    |SHLD|MUST |    |
   Attribute Name     Code Defined Data Type |MUST| MAY|NOT |NOT  |Encr|
   ------------------------------------------+----+----+----+-----+----+
   MIP6-Agent-Info    TBD  4.1     Grouped   |    |  P |    | M,V | Y  |
   PMIP6-IPv4-Home-                          |    |    |    |     |    |
       Address        TBD  4.2     Address   |    |  P |    | M,V | Y  |
   PMIP6-DHCP-Address TBD  4.3     Address   |    |  P |    | M,V | Y  |
   PMIP6-Home-Prefix  TBD  4.4     Address   |    |  P |    | M,V | Y  |
   MIP6-Feature-                             |    |    |    |     |    |
       Vector         TBD  4.5     Unsigned64|    |  P |    | M,V | Y  |
   Calling-Station-Id  31  4.7     UTF8String|    |  P |    | M,V | Y  |
   Mobile-Node-                              |    |    |    |     |    |
       Identifier     TBD  4.6     UTF8String|    |  P |    | M,V | Y  |
   ------------------------------------------+----+----+----+-----+----+

                      Figure 3: AVP Flag Rules Table








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8.2.  LMA to HAAA Interface

   The AVP occurrences are defined in the ABNFs for the LHA-Request (see
   Section 6.2.1) and LHA-Answer (see Section 6.2.2) commands.

   The following table describes the Diameter AVPs code values, types,
   possible flag values, and whether the AVP MAY be encrypted.  The
   Diameter base protocol specification [RFC3588] specifies the AVP
   Flags rules for AVPs in section 4.5.  Due to space constraints, the
   short form DiamIdent is used to represent DiameterIdentity and
   OctetStr is used to represent OctetString.

                                             +--------------------+
                                             |   AVP Flag rules   |
                                             +----+----+----+-----+----+
                      AVP  Section           |    |    |SHLD|MUST |    |
   Attribute Name     Code Defined Data Type |MUST| MAY|NOT |NOT  |Encr|
   ------------------------------------------+----+----+----+-----+----+
   MIP6-Agent-Info    TBD  4.1     Grouped   |  M |  P |    |  V  | Y  |
   PMIP6-IPv4-Home-                          |    |    |    |     |    |
       Address        TBD  4.2     Address   |  M |  P |    |  V  | Y  |
   PMIP6-Home-Prefix  TBD  4.4     Address   |  M |  P |    |  V  | Y  |
   MIP6-Feature-                             |    |    |    |     |    |
       Vector         TBD  4.5     Unsigned64|  M |  P |    |  V  | Y  |
   Calling-Station-Id  31  4.7     UTF8String|  M |  P |    |  V  | Y  |
   Service-Selection  TBD  4.8     UTF8String|  M |  P |    |  V  | Y  |
   Session-Timeout     27  4.9     Unsigned32|  M |  P |    |  V  | Y  |
   ------------------------------------------+----+----+----+-----+----+

                      Figure 4: AVP Flag Rules Table


9.  IANA Considerations

9.1.  Attribute Value Pair Codes

   This specification defines the following new AVPs:

     PMIP6-DHCP-Address          is set to TBD
     PMIP6-Home-Prefix           is set to TBD
     PMIP6-IPv4-Home-Address     is set to TBD
     Mobile-Node-Identifier      is set to TBD

9.2.  Namespaces

   This specification defines new values to the Mobility Capability
   registry (see [I-D.ietf-dime-mip6-integrated]) for use with the MIP6-
   Feature-Vector AVP:



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   Token                            | Value                | Description
   ---------------------------------+----------------------+------------
   PMIP6_SUPPORTED                  | 0x0000010000000000   | [RFC TBD]
   IP4_HOA_SUPPORTED                | 0x0000020000000000   | [RFC TBD]
   LOCAL_MAG_ROUTING_SUPPORTED      | 0x0000040000000000   | [RFC TBD]

9.3.  Application Identifiers

   This specification requires IANA to allocate a new value for
   "Diameter Proxy Mobile IPv6" (PMIP6) from the Application Identifier
   namespace defined in [RFC3588].

9.4.  Command Codes

   IANA is requested to allocate new command code values for the
   following new commands from the Command Code namespace defined in
   [RFC3588].

   Command Code                       | Value
   -----------------------------------+------
   LHA-Request                 (LHAR) | TBD
   LHA-Answer                  (LHAA) | TBD

9.5.  Result-Code AVP Values

   This specification requests IANA to allocate a new value to the
   Result-Code AVP (AVP Code 268) address space within the Permanent
   Failures category (5xxx) defined in [RFC3588]:

     DIAMETER_PMIP6_AUTHORIZATION_FAILED  is set to TBD


10.  Security Considerations

   The security considerations of the Diameter Base protocol [RFC3588],
   Diameter EAP application [RFC4072], Diameter NASREQ application
   [RFC4005] and Diameter Mobile IPv6 integrated scenario bootstrapping
   [I-D.ietf-dime-mip6-integrated] are applicable to this document.

   In general, the Diameter messages may be transported between the HA
   and the Diameter server via one or more AAA brokers or Diameter
   agents.  In this case the HA to the Diameter server AAA communication
   rely on the security properties of the intermediate AAA brokers and
   Diameter agents (such as proxies).







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11.  Acknowledgements

   Jouni Korhonen would like to thank TEKES MERCoNe project for
   providing funding to work on this document while he was with
   TeliaSonera.


12.  References

12.1.  Normative References

   [I-D.ietf-dime-mip6-integrated]
              Korhonen, J., Bournelle, J., Tschofenig, H., Perkins, C.,
              and K. Chowdhury, "Diameter Mobile IPv6: Support for
              Network Access Server to Diameter Server  Interaction",
              draft-ietf-dime-mip6-integrated-12 (work in progress),
              January 2009.

   [I-D.ietf-netlmm-pmip6-ipv4-support]
              Wakikawa, R. and S. Gundavelli, "IPv4 Support for Proxy
              Mobile IPv6", draft-ietf-netlmm-pmip6-ipv4-support-07
              (work in progress), December 2008.

   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119, March 1997.

   [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.

   [RFC4072]  Eronen, P., Hiller, T., and G. Zorn, "Diameter Extensible
              Authentication Protocol (EAP) Application", RFC 4072,
              August 2005.

   [RFC4282]  Aboba, B., Beadles, M., Arkko, J., and P. Eronen, "The
              Network Access Identifier", RFC 4282, December 2005.

   [RFC5213]  Gundavelli, S., Leung, K., Devarapalli, V., Chowdhury, K.,
              and B. Patil, "Proxy Mobile IPv6", RFC 5213, August 2008.

12.2.  Informative References

   [I-D.damic-netlmm-pmip6-ind-discover]
              Damic, D., Premec, D., Patil, B., Sahasrabudhe, M., and S.
              Krishnan, "Proxy Mobile IPv6 indication and discovery",



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              draft-damic-netlmm-pmip6-ind-discover-03 (work in
              progress), February 2008.

   [I-D.ietf-dime-mip6-split]
              Korhonen, J., Tschofenig, H., Bournelle, J., Giaretta, G.,
              and M. Nakhjiri, "Diameter Mobile IPv6: Support for Home
              Agent to Diameter Server  Interaction",
              draft-ietf-dime-mip6-split-16 (work in progress),
              December 2008.

   [RFC3748]  Aboba, B., Blunk, L., Vollbrecht, J., Carlson, J., and H.
              Levkowetz, "Extensible Authentication Protocol (EAP)",
              RFC 3748, June 2004.

   [RFC3753]  Manner, J. and M. Kojo, "Mobility Related Terminology",
              RFC 3753, June 2004.

   [RFC3775]  Johnson, D., Perkins, C., and J. Arkko, "Mobility Support
              in IPv6", RFC 3775, June 2004.

   [RFC4283]  Patel, A., Leung, K., Khalil, M., Akhtar, H., and K.
              Chowdhury, "Mobile Node Identifier Option for Mobile IPv6
              (MIPv6)", RFC 4283, November 2005.

   [RFC4306]  Kaufman, C., "Internet Key Exchange (IKEv2) Protocol",
              RFC 4306, December 2005.

   [RFC5149]  Korhonen, J., Nilsson, U., and V. Devarapalli, "Service
              Selection for Mobile IPv6", RFC 5149, February 2008.


Authors' Addresses

   Jouni Korhonen (editor)
   Nokia Siemens Network
   Linnoitustie 6
   Espoo  FIN-02600
   Finland

   Email: jouni.nospam@gmail.com











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   Julien Bournelle
   Orange Labs
   38-4O rue du general Leclerc
   Issy-Les-Moulineaux  92794
   France

   Email: julien.bournelle@orange-ftgroup.com


   Ahmad Muhanna
   Nortel
   2221 Lakeside Blvd.
   Richardson, TX  75082
   USA

   Email: amuhanna@nortel.com


   Kuntal Chowdhury
   Starent Networks
   30 International Place
   Tewksbury  MA  01876
   USA

   Email: kchowdhury@starentnetworks.com


   Ulrike Meyer
   RWTH Aachen

   Email: meyer@umic.rwth-aachen.de




















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