wdiff draft-ietf-dime-pmip6-00.txt draft-ietf-dime-pmip6-01.txt

Diameter Maintenance and J. Korhonen, Ed.
Extensions (DIME) Nokia Siemens Network
Internet-Draft J. Bournelle
Intended status: Standards Track Orange Labs
Expires: July 18, September 7, 2009 A. Muhanna
Nortel K. Chowdhury
Starent Networks
A. Muhanna
Nortel
U. Meyer
RWTH Aachen
January 14,
March 6, 2009

Diameter Proxy Mobile IPv6: Support For Mobile Access Gateway and Local Mobility
Anchor to Interaction with Diameter Server Interaction
draft-ietf-dime-pmip6-00.txt
draft-ietf-dime-pmip6-01.txt

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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
attaches to a Proxy Mobile IPv6 Domain and performs access
authentication. During the binding update exchange between the
Mobile Access Gateway and the Local Mobility Anchor, the Local
Mobility Anchor can interact with the Diameter server in order to
update the remote policy store with the mobility session related
information.

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 MIP6-Home-Link-Prefix AVP . . . . . . . . . . . . . . . . . . 8
4.4. PMIP6-Home-Prefix PMIP6-DHCP-Server-Address AVP . . . . . . . . . . . . . . . . . . 8
4.5. MIP6-Feature-Vector AVP . . . . . . . . . . . . . . . . . 8
4.6. Mobile-Node-Identifier AVP . . . . . . . . . . . . . . . . 9
4.7. Calling-Station-Id AVP . . . . . . . . . . . . . . . . . . 10 9
4.8. Service-Selection AVP . . . . . . . . . . . . . . . . . . 10
4.9. Session-Timeout Service-Configuration AVP . . . . . . . . . . . . . . . . . . . 10
5. MAG to HAAA Interface Application Support . . . . . . . . . . 10
5.1. Application Support and Command Codes . . . . . . . . . . 10
5.2. Accounting at MAG . . 11
5.1. MAG-to-HAAA Interface . . . . . . . . . . . . . . . . . . 11
6. LMA to HAAA
5.2. LMA-to-HAAA Interface Application Support . . . . . . . . . . 11
6.1. Application Support and Command Codes . . . . . . . . . . 11
6.2.
5.2.1. Authorization of the Proxy Binding Update . . . . . . 12
6. Proxy Mobile IPv6 Session Management . . 11
6.2.1. LHA-Request . . . . . . . . . . . . 12
6.1. Session-Termination-Request . . . . . . . . . 12
6.2.2. LHA-Answer . . . . . . 13
6.2. Session-Termination-Answer . . . . . . . . . . . . . . . . 13
6.3. Accounting at LMA . . . . . . . Abort-Session-Request . . . . . . . . . . . . . 14
7. Proxy Mobile IPv6 Session Management . . . . . 13
6.4. Abort-Session-Answer . . . . . . . . 14
7.1. Session-Termination-Request . . . . . . . . . . . 13
7. Attribute Value Pair Occurrence Tables . . . . 15
7.2. Session-Termination-Answer . . . . . . . . 13
7.1. MAG-to-HAAA Interface . . . . . . . . 15
7.3. Abort-Session-Request . . . . . . . . . . 14
7.2. LMA-to-HAAA Interface . . . . . . . . 15
7.4. Abort-Session-Answer . . . . . . . . . . 14
8. IANA Considerations . . . . . . . . . 15
8. Attribute Value Pair Occurrence Tables . . . . . . . . . . . . 15 14
8.1. MAG to HAAA Interface . . Attribute Value Pair Codes . . . . . . . . . . . . . . . . 15 14
8.2. LMA to HAAA Interface . . . . . . . . . . . . . Namespaces . . . . . 17
9. IANA Considerations . . . . . . . . . . . . . . . . . . . 15
8.3. Result-Code AVP Values . . 17
9.1. Attribute Value Pair Codes . . . . . . . . . . . . . . . . 17
9.2. Namespaces 15
9. Security Considerations . . . . . . . . . . . . . . . . . . . 15
10. Acknowledgements . . . . . 17
9.3. Application Identifiers . . . . . . . . . . . . . . . . . 18
9.4. Command Codes . 15
11. References . . . . . . . . . . . . . . . . . . . . . 18
9.5. Result-Code AVP Values . . . . . 16
11.1. Normative References . . . . . . . . . . . . . 18
10. Security Considerations . . . . . . 16
11.2. Informative References . . . . . . . . . . . . . 18
11. Acknowledgements . . . . . 16
Authors' Addresses . . . . . . . . . . . . . . . . . . 19
12. References . . . . . . . . . . . . . . . . . . . . . . . . . . 19
12.1. Normative References . . . . . . . . . . . . . . . . . . . 19
12.2. Informative References . . . . . . . . . . . . . . . . . . 19
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 20 17

1. Introduction

In the Proxy Mobile IPv6 (PMIPv6) protocol [RFC5213] and its IPv4 support
for Proxy Mobile IPv6 [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 IP address of the
LMA, possibly MN's home network prefix Home Network Prefix(es) (MN-HNP), possibly MN's IPv4 home
address (IPv4-HoA), (IPv4-MN-HoA), DHCP server address and other PMIPv6 specific
information such as the 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 attaches to the MAG's Proxy Mobile IPv6 Domain (PMIPv6-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
Authentication, Authorization, and Accounting (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 When the PBU
LMA receives the PBU, the LMA needs may need to interact with update the Diameter server
and fetch remote policy
store located in the MSA with the MN's policy mobility session related information that was already
partially downloaded to the MAG.
information.

This specification defines the Diameter support for the PMIPv6 and
the corresponding mobility service session setup. PMIPv6. 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
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
document are to be interpreted as described in RFC2119 [RFC2119].

General mobility

The general terminology used in this document can be found in [RFC3753].
[RFC5213] and [I-D.ietf-netlmm-pmip6-ipv4-support]. The following
additional or clarified terms are also 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 Authentication, Authorization, and accounting Accounting (AAA) server
located in user's home network. A HAAA is essentially a Diameter
server.

3. Solution Overview

This document addresses the authentication, authorization, accounting AAA interactions and AAA-based session
management functionality needed by in the PMIPv6 protocol. Domain. This document
defines Diameter based interfaces AAA interactions 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] HAAA,
and define between the
needed additional AVPs LMA and functionality to fully support PMIPv6
deployment. the HAAA.

The policy profile download is downloaded from the HAAA to the MAG is part of during the
network access authentication procedure when a
MN roams into or
within a attachment to the 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.

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

Legend:

(1): LMA <-> HAAA MAG-to-HAAA interaction is described
in Section 6 5.1
(2): MAG <-> HAAA LMA-to-HAAA interaction is described
in Section 5 5.2

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

In a PMIPv6 access scenario
Server

When a MN attaches to a PMIPv6-Domain and
starts PMIPv6 Domain, a network access
authentication procedure. procedure is usually started. 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 PMIPv6
specific information is returned along with the successful network
access authentication answer to the MAG.

After the MN access is has been successfully authenticated, the MAG sends a PBU
to the LMA. LMA based on the MN's policy profile information. Upon
receiving the PBU the LMA interacts with the HAAA and fetches the
relevant parts of the subscriber policy, authorization policy profile and
security authorization
information related to the PMIPv6 mobility service session. This
specification assumes that In this
specification, 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 has the dynamic SA setup procedure
is out role 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. remote policy
store.

4. Attribute Value Pair Definitions

This section describes both new AVPs Attribute Value Pairs (AVPs) defined in by this
specification
and or re-used AVPs that are used from existing specifications 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 (AVP Code 486) is defined in
[I-D.ietf-dime-mip6-integrated].
[RFC5447]. The AVP is used to carry LMA addressing related
information and a MN-HNP. This specification reuses extends the MIP6-Agent-
Info with the said PMIP6-IPv4-Home-Address AVP and its sub-AVPs using the Diameter
extensibility rules defined in [RFC3588]. The PMIP6-IPv4-Home-
Address AVP contains the IPv4-MN-HoA.

The extended MIP6-Agent-Info AVP results to carry the LMA IP address and/or FQDN. following grouped
AVP:

MIP6-Agent-Info ::= < AVP-Header: 486 >
*2[ MIP-Home-Agent-Address ]
[ MIP-Home-Agent-Host ]
[ MIP6-Home-Link-Prefix ]
[ PMIP6-IPv4-Home-Address ]
* [ AVP ]

4.2. PMIP6-IPv4-Home-Address AVP

The PMIP6-IPv4-Home-Address AVP (AVP Code TBD) TBD2) is of type Address
and contains the IPv4-HoA of the MN. The primary use of this an IPv4 address. This AVP is used to carry the IPv4 Home Address, IPv4-MN-
HoA, if available, from the HAAA to the MAG. This AVP SHOULD only be
present when the MN is statically provisioned with the IPv4-MN-HoA.
Note that proactive dynamic assignment of the IPv4-MN-HoA by the HAAA
may result in unnecessary reservation of IPv4 address resources,
because the MN may considerably delay or completely bypass its IPv4
address configuration.

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

4.3. MIP6-Home-Link-Prefix AVP

The answer message SHOULD MIP6-Home-Link-Prefix AVP (AVP Code 125) is defined in [RFC5447].
This AVP is used to carry the MN-HNP, if available, from the HAAA to
the MAG. The low 64 bits of the prefix MUST be all cases zeroes.

The MIP6-Home-Link-Prefix AVP is also used on the LMA-to-HAAA
interface. The AVP contains the prefix assigned to the MN. If the
LMA delegates the assignment of the MN-HNP to the HAAA, the AVP MUST
contain all zeroes address (i.e., 0::0) in the request message. If
the LMA delegated the MN-HNP assignment to the HAAA, then the AVP
contains the HAAA assigned IPv4 Home Address value.

4.3. PMIP6-DHCP-Address MNM-HNP in the response message.

4.4. PMIP6-DHCP-Server-Address AVP

The PMIP6-DHCP-Address PMIP6-DHCP-Server-Address AVP (AVP Code TBD) TBD1) 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]. [RFC5447]. This
document only reserves defines new capability flag 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:
[RFC5447].

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.

IP4_HOA_SUPPORTED (0x0000020000000000)

Assignment of the IPv4-HoA IPv4-MN-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 IPv4-MN-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 IPv4-MN-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 SHOULD 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) TBD3) is of type UTF8String
and contains the mobile node identifier (MN-Identifier, see
[RFC5213]) in a the NAI [RFC4282] format. This AVP is used on the MAG-
to-HAAA interface. The Mobile-Node-Identifier AV is designed for
deployments where the MAG does not have a way to find out such MN
identity that could be used in subsequent PBU/PBA exchanges (e.g.,
due to identity hiding during the network access authentication) or
the HAAA interface. wants to assign periodically changing identities to the MN.

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 MUST
silently discard the received MN-identifier.

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
corresponds to a real physical interface or something that the MAG has
generated. Link-Layer Identifier as defined in RFC 5213
Section 2.2. and 8.6.

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 LMA-to-HAAA
interface. The service identifier may be This AVP is re-used from [I-D.ietf-dime-mip6-split]. The
service identifier may be used to assist the PBU
authorization. authorization and
the assignment of the MN-HNP and the IPv4-MN-HoA as described in RFC
5149 [RFC5149]. 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
Domain. In the absence of the Binding Cache Entry Service-Selection AVP 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 request
message, the HAAA interface. Rather, this specification re-uses any Diameter
application and its commands that are used may want to authenticate and
authorize inform the MN for LMA of 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 default service session when a MN attaches and authenticates
provisioned to a
PMIPv6 domain. This includes the bootstrapping of PMIPv6 session
related information MN and possibly PMIPv6 security related information
retrieval. The same interface may include the Service-Selection AVP in the
response message.

It is also be used for accounting.

Whenever possible that the MAG sends a Diameter request message to receives the HAAA service selection
information from the
User-Name AVP MUST contain MN, for example, via some lower layer mechanism.
In this case the MN identity. At minimum MAG SHOULD include the home
realm Service-Selection AVP also in
the MAG-to-HAAA request messages. In absence of the MN MUST be available at Service-
Selection AVP in the MAG when MAG-to-HAAA request messages, the network access
authentication takes place. Otherwise HAAA may want
to inform the MAG is not able to route of the Diameter request messages towards default service provisioned to the correct HAAA. The MN
identity MUST be in Network Access Identifier (NAI) [RFC4282] format.

The Diameter and
include the Service-Selection AVP in the response messages MAY contain Framed-IPv6-Prefix and/or
Framed-IPv4-Address AVPs. For example message.

Whenever the Service-Selection AVP is included either in a local Diameter proxy MAY add
those request
message or in order to advertise locally available prefixes a response message, and addresses
as well [I-D.damic-netlmm-pmip6-ind-discover]. It the AAA interaction with HAAA
completes successfully, it is also possible an indication 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 HAAA also
authorized the MAG MN to HAAA interface is based on some service. This should be taken into account
when considering what to include in the
[RFC4005]. Auth-Request-Type AVP.

The application identifier service selection concept supports signaling one service at time.
However, the MN policy profile MAY support multiple services being
used for accounting is simultaneously. For this purpose, the
Diameter Base Accounting (3) [RFC3588].

TBD.

6. LMA to HAAA Interface Application Support

6.1. Application Support and Command Codes

The MAY return multiple
LMA and service pairs (see Section 4.9) to HAAA interface may be used for multiple purposes. These
include the authorization of MAG in a response
message that ends a successful authentication (and possibly an
authorization) exchange between the incoming PBU, possible PMIPv6
security related information retrieval, accounting MAG and PMIPv6 the HAAA. Whenever the
MN initiates additional mobility session
management.

This specification defines to another service (using a new Application-ID for
link layer or deployment specific method), the LMA to HAAA
interface and specifically provisioned service
information is already contained in the MAG. Therefore, there is no
need for additional AAA signaling between the authorization of MAG and the Proxy Binding
Updates. HAAA.

4.9. Service-Configuration AVP

The new application identifier Service-Configuration AVP (AVP Code TBD4) is TBD BY IANA. The new
application also defines two new commands and respective Command
Codes: LHA-Request (value of TBD) type Grouped and LHA-Answer (value of TBD). The
LMA
contains a service and a LMA pair. The HAAA can use this AVP to
inform the MAG of MN's subscribed services and LMAs where those
services are hosted in.

Service-Configuration ::= < AVP-Header: TBD4 >
[ MIP6-Agent-Info ]
[ Service-Selection ]
* [ AVP ]

5. Application Support and Command Codes

5.1. MAG-to-HAAA Interface

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

6.2. Authorization of

The MAG-to-HAAA interactions are primarily used for bootstrapping
PMIPv6 mobility service session when a MN attaches and authenticates
to a PMIPv6 Domain. This includes the Proxy Binding Update bootstrapping of PMIPv6
session related information. The same interface may also be used for
accounting.

Whenever the LMA MAG sends a Diameter request message to the HAAA, HAAA the
User-Name AVP MUST SHOULD contain the MN MN's identity. The identity MN identity, if
available, MUST be in
a NAI Network Access Identifier (NAI) [RFC4282]
format. The LMA MAY retrieve At minimum the MN identity information from home realm of the PBU MN-ID [RFC4283][RFC5213] mobility option. The identity
SHOULD MN MUST be available at the same as used on
MAG when the network access authentication takes place. Otherwise
the MAG is not able to HAAA interface, but in a
case those identities differ route the HAAA MUST have a mechanism of
mapping Diameter request messages towards
the correct HAAA. The MN identity used on the MAG to HAAA MAG-to-HAAA interface to
and in the
identity used on User-Name AVP MAY entirely be related to the LMA network
access authentication, and therefore not suitable to HAAA interface.

If be used as the PBU contains
MN-ID mobility option value in the MN Link-Layer Identifier option, subsequent PBU/PBA messages. See
the Calling-
Station-Id AVP SHOULD be included related discussion on MN's identities in Section 4.6 and in
Section 5.2.1

For the session management and service authorization purposes,
session state SHOULD be maintained on the MAG-to-HAAA interface. See
the discussion in Section 4.8.

5.2. LMA-to-HAAA Interface

The-LMA-to HAAA interface may be used for multiple purposes. These
include the authorization of the incoming PBU, updating the LMA
address to the HAAA, accounting and PMIPv6 session management.

This specification does not define a new Application-ID for the LMA-
to-HAAA Diameter connection. Rather, this specification re-uses any
Diameter application and their commands. An example application
could be NASREQ [RFC4005]. The LMA acts as a Diameter client.

5.2.1. Authorization of the Proxy Binding Update

Whenever the LMA sends a Diameter request message to the HAAA, the
User-Name AVP SHOULD contain the MN's identity. The LMA MAY retrieve
the MN's 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 the 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.

The LMA and the HAAA use the PMIP6-Home-Prefix MIP6-Home-Link-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
PMIP6-IPv4-Home-Address AVP to exchange the MN IPv4-HoA IPv4-MN-HoA when
appropriate. If Note that these AVPs are encapsulated inside the
PMIP6-Home-Prefix MIP6-
Agent-Info AVP. Which entity is set to an all zeroes address (i.e., 0::0) in actually responsible for the
request message, it address
management is an indication that the HAAA needs to assign a deployment specific within the MN-HNP PMIPv6 Domain 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 MUST
be pre-agreed on per deployment basis.

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)
(TBD5) indicating a permanent failure.

The LMA to HAAA LMA-to-HAAA interface can also be used to update the selected LMA
address to the HAAA. HAAA and the remote policy store during the
authorization step. This applies to the case where the MAG, for
example, discovers discovered the LMA address using the DNS.

6.2.1. LHA-Request

The LHA-Request (LHAR, value of TBD) message is sent by

6. Proxy Mobile IPv6 Session Management

Concerning a PMIPv6 mobility session, the LMA to HAAA, the MAG and the LMA
Diameter server to initiate entities SHOULD be stateful and maintain the corresponding
Authorization Session State Machine defined in [RFC3588]. If a state
is maintained, then a PMIPv6 mobility service session
authorization procedure. The LHAR message format is defined below:

<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 that can be identified
by any of TBD) message is sent the Binding Cache (BCE) Lookup Keys described in response RFC 5213
(see Sections 5.4.1.1., 5.4.1.2. and 5.4.1.3.) MUST map to
the LHA-Request (LHAR) message. a single
Diameter Session-Id. 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 Domain allows further separation
of sessions, for example, identified by the RFC 5213 BCE Lookup Keys
and the PMIP6-IPv4-Home-Address AVP contains IPv4-
HoA, if such information are needed. The LHAA message format is
defined below:

<LHA-Answer> ::= < service selection combination (see Section 4.8 and
[RFC5149]), then a single 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 MUST map to HAAA interface is based on a PMIPv6
mobility session identified by the
[RFC4005]. The application identifier used for accounting is RFC 5213 BCE Lookup Keys and the
Diameter Base Accounting (3) [RFC3588].

TBD.

7. Proxy Mobile IPv6 Session Management

Concerning
selected service.

If both the MAG-to-HAAA and the LMA-to-HAAA interfaces are deployed
in a PMIPv6 session, Domain, and a state is maintained on both interfaces,
then one PMIPv6 mobility session would have two distinct Diameter
sessions on the HAAA MAY maintain a state. HAAA. The LMA HAAA needs to be aware of this deployment
possibility and SHOULD allow multiple Diameter sessions for the MAG MUST support the Authorization Session State Machine
defined in [RFC3588]. same
PMIPv6 mobility session.

Diameter session termination related commands described in the
following sections may be exchanged between the LMA and the HAAA, or
between the MAG and the HAAA. The actual PMIPv6 session termination
procedures take place at PMIPv6 protocol level and are out of scope of this document.

7.1. described in
more detail in RFC 5213 and [I-D.ietf-mext-binding-revocation].

6.1. 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.

6.2. 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
+---------------+
| 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. a PMIPv6 session.

6.3. Abort-Session-Request

The
Diameter base protocol specification [RFC3588] specifies HAAA MAY send the AVP
Flags rules for AVPs in section 4.5. Due Abort-Session-Request (ASR) command [RFC3588]
to space constraints, the
short form DiamIdent is used LMA or to represent DiameterIdentity the MAG 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

8.2. request termination of a PMIPv6 session.

6.4. Abort-Session-Answer

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

7. Attribute Value Pair Occurrence Tables

The AVP occurrences following tables list the PMIPv6 MAG-to-HAAA interface and LMA-
to-HAAA interface AVPs including those that are defined in the ABNFs for the LHA-Request (see
Section 6.2.1) and LHA-Answer (see Section 6.2.2) commands. [RFC5447].

The following table describes Figure 2 contains the Diameter AVPs code values, types,
possible flag values, and whether their occurrences on the AVP MAY be encrypted. MAG-to-
HAAA interface. The
Diameter base protocol specification [RFC3588] specifies the AVP
Flags rules for AVPs that are part of grouped AVP are not listed
in section 4.5. Due to space constraints, the
short form DiamIdent is used to represent DiameterIdentity and
OctetStr is used to represent OctetString.

7.1. MAG-to-HAAA Interface

+---------------+
| Command-Code |
|-------+-------+
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- | REQ | ANS |
-------------------------------+-------+-------+
PMIP6-DHCP-Server-Address | 0 | 0+ |
Address TBD 4.2 Address
MIP6-Agent-Info | M 0+ | P 0+ |
MIP6-Feature-Vector | V 0-1 | Y 0-1 |
PMIP6-Home-Prefix TBD 4.4 Address
Mobile-Node-Identifier | M 0-1 | P 0-1 |
Calling-Station-Id | V 0-1 | Y 0 |
MIP6-Feature-
Service-Selection | 0-1 | 0 |
Service-Configuration | 0 | 0+ |
Vector TBD 4.5 Unsigned64| M
+-------+-------+

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

7.2. LMA-to-HAAA Interface

+---------------+
| P Command-Code |
|-------+-------+
Attribute Name | V REQ | Y ANS |
Calling-Station-Id 31 4.7 UTF8String| M
-------------------------------+-------+-------+
MIP6-Agent-Info | P 0-1 | 0-1 | V
MIP6-Feature-Vector | Y 0-1 |
Service-Selection TBD 4.8 UTF8String| M 0-1 | P
Calling-Station-Id | 0-1 | V 0 | Y
Service-Selection |
Session-Timeout 27 4.9 Unsigned32| M 0-1 | P 0-1 |
User-Name | V 0-1 | Y 0-1 |
------------------------------------------+----+----+----+-----+----+
+-------+-------+

Figure 4: AVP Flag Rules Table

9. 3: LMA-to-HAAA Interface Generic Diameter Request and Answer
Commands AVPs

8. IANA Considerations

9.1.

8.1. Attribute Value Pair Codes

This specification defines the following new AVPs:

PMIP6-DHCP-Address

PMIP6-DHCP-Server-Address is set to TBD
PMIP6-Home-Prefix TBD1
PMIP6-IPv4-Home-Address is set to TBD
PMIP6-IPv4-Home-Address TBD2
Mobile-Node-Identifier is set to TBD
Mobile-Node-Identifier TBD3
Service-Configuration is set to TBD

9.2. TBD4

8.2. Namespaces

This specification defines new values to the Mobility Capability
registry (see [I-D.ietf-dime-mip6-integrated]) [RFC5447]) for use with the MIP6-
Feature-Vector MIP6-Feature-Vector AVP:

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.

8.3. 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. TBD5

9. 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]
[RFC5447] 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).

11.

10. Acknowledgements

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

12.

11. References

12.1.

11.1. 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 draft-ietf-netlmm-pmip6-ipv4-support-09
(work in progress), December 2008. January 2009.

[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.,

[RFC5447] Korhonen, J., Bournelle, J., Tschofenig, H., Perkins, C.,
and S.
Krishnan, "Proxy K. Chowdhury, "Diameter Mobile IPv6 indication and discovery",
draft-damic-netlmm-pmip6-ind-discover-03 (work in
progress), IPv6: Support for
Network Access Server to Diameter Server Interaction",
RFC 5447, February 2008. 2009.

11.2. Informative References

[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.

[I-D.ietf-mext-binding-revocation]
Muhanna, A., Khalil, M., Gundavelli, S., Chowdhury, K.,
and P. Yegani, "Binding Revocation for IPv6 Mobility",
draft-ietf-mext-binding-revocation-03 (work in progress),
January 2009.

[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 FI-02600
Finland

Email: jouni.nospam@gmail.com

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

Email: amuhanna@nortel.com

Ulrike Meyer
RWTH Aachen

Email: meyer@umic.rwth-aachen.de