Diameter Maintenance and J. Korhonen, Ed.
Extensions (DIME) TeliaSonera
Internet-Draft J. Bournelle
Intended status: Standards Track France Telecom R&D
Expires: May 22, 2008 K. Chowdhury
Starent Networks
U. Meyer
Nokia Siemens Networks
November 19, 2007
Diameter Proxy Mobile IPv6: Support For Mobility Access Gateway and
Local Mobility Anchor to Diameter Server Interaction
draft-korhonen-dime-pmip6-02.txt
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Copyright Notice
Copyright (C) The IETF Trust (2007).
Abstract
This specification defines the Diameter support for the Proxy Mobile
IPv6. The policy information needed by the Proxy Mobile IPv6 is
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defined in mobile node's policy profile, which gets downloaded from
the Diameter server to the Mobile Access Gateway once the mobile node
roams into a Proxy Mobile IPv6 Domain and performs the access
authentication. The access authentication procedure into the Proxy
Mobile IPv6 Domain resembles the Mobile IPv6 integrated scenario
bootstrapping. Rather than defining a completely new set of
attributes or a new Diameter application this specification only
leverages the work already done for the Mobile IPv6 bootstrapping.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 4
2. Terminology and Abbreviations . . . . . . . . . . . . . . . . 4
3. Solution Overview . . . . . . . . . . . . . . . . . . . . . . 5
4. Attribute Value Pair Definitions . . . . . . . . . . . . . . . 7
4.1. PMIP6-MAG-Address . . . . . . . . . . . . . . . . . . . . 7
4.2. MIP6-Agent-Info . . . . . . . . . . . . . . . . . . . . . 7
4.3. PMIP6-IPv4-Home-Address . . . . . . . . . . . . . . . . . 7
4.4. PMIP6-DHCP-Address . . . . . . . . . . . . . . . . . . . . 7
4.5. PMIP6-Home-Prefix . . . . . . . . . . . . . . . . . . . . 7
4.6. PMIP6-MN-FQDN . . . . . . . . . . . . . . . . . . . . . . 8
4.7. MIP6-Feature-Vector . . . . . . . . . . . . . . . . . . . 8
4.8. Chargeable-User-Identity . . . . . . . . . . . . . . . . . 9
4.9. Calling-Station-Id . . . . . . . . . . . . . . . . . . . . 9
4.10. Called-Station-Id . . . . . . . . . . . . . . . . . . . . 10
4.11. Session-Timeout . . . . . . . . . . . . . . . . . . . . . 10
5. MAG to HAAA Interface Application Support, Commands Codes
and Attribute Value Pairs . . . . . . . . . . . . . . . . . . 10
5.1. Application Support and Command Codes . . . . . . . . . . 10
5.2. Diameter-EAP-Request (DER) . . . . . . . . . . . . . . . . 10
5.3. Diameter-EAP-Answer (DEA) . . . . . . . . . . . . . . . . 11
5.4. AA-Request (AAR) . . . . . . . . . . . . . . . . . . . . . 12
5.5. AA-Answer (AAA) . . . . . . . . . . . . . . . . . . . . . 13
5.6. Accounting at MAG . . . . . . . . . . . . . . . . . . . . 13
6. LMA to HAAA Interface Application Support, Commands Codes
and Attribute Value Pairs . . . . . . . . . . . . . . . . . . 13
6.1. Application Support and Command Codes . . . . . . . . . . 13
6.2. Authorization of the Proxy Binding Update . . . . . . . . 14
6.2.1. AA-Request (AAR) . . . . . . . . . . . . . . . . . . . 15
6.2.2. AA-Answer (AAA) . . . . . . . . . . . . . . . . . . . 15
6.3. MAG to LMA Security Association Setup . . . . . . . . . . 16
6.4. Accounting at LMA . . . . . . . . . . . . . . . . . . . . 17
7. Proxy Mobile IPv6 Session Management . . . . . . . . . . . . . 17
7.1. Session Termination Request - Command . . . . . . . . . . 17
7.2. Session Termination Answer - Command . . . . . . . . . . . 17
7.3. Abort Session Request - Command . . . . . . . . . . . . . 17
7.4. Abort Session Answer - Command . . . . . . . . . . . . . . 17
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8. Attribute Value Pair Occurrence Tables . . . . . . . . . . . . 17
9. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 19
9.1. Attribute Value Pair Codes . . . . . . . . . . . . . . . . 19
9.2. Namespaces . . . . . . . . . . . . . . . . . . . . . . . . 20
9.3. Application Identifiers . . . . . . . . . . . . . . . . . 20
9.4. Result-Code AVP Values . . . . . . . . . . . . . . . . . . 20
10. Security Considerations . . . . . . . . . . . . . . . . . . . 20
11. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 20
12. References . . . . . . . . . . . . . . . . . . . . . . . . . . 20
12.1. Normative References . . . . . . . . . . . . . . . . . . . 20
12.2. Informative References . . . . . . . . . . . . . . . . . . 21
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 22
Intellectual Property and Copyright Statements . . . . . . . . . . 24
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1. Introduction
In the Proxy Mobile IPv6 (PMIPv6) protocol [1] and its IPv4 support
[2] 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, 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 or actually the
integrated Proxy Mobile Agent (PMA) sends the 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. 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 integral part of the MAG. The access
authentication procedure into a PMIPv6-Domain resembles the Mobile
IPv6 integrated scenario bootstrapping [3]. 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 [3].
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 [4].
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General mobility terminology can be found in [12]. 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 MAG to HAAA and LMA to HAAA
interfaces. The intention of this document is only to extend
existing Mobile IPv6 specifications such as [3] and define needed
additional AVPs and functionality to fulfil the needs of the 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 [3] 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 |<-------->| LMA |
| Profile| +-----+
+--------+ | <--- LMA-Address
^ |
| // \\
+---|------------- //---\\----------------+
( | IPv4/IPv6 // \\ )
( | Network // \\ )
+---|-----------//---------\\-------------+
| // \\
Diameter // <- Tunnel1 \\ <- Tunnel2
| // \\
| |- MAG-Address1 |- MAG-Address2
| +----+ +----+
+---->|MAG1| |MAG2|
+----+ +----+
| |
| |
[MN1] [MN2]
Figure 1: Proxy Mobile IPv6 Domain 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) [13]. 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.
During the access authentication procedure 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 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 [14]. The dynamic SA setup procedure may be triggered by the
MN attaching to the MAG that does not have existing SA with the
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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 MAG during the SA creation is MAG's own
identity and the creadentials are for authenticating the MAG toward
the LMA.
4. Attribute Value Pair Definitions
4.1. PMIP6-MAG-Address
The PMIP6-MAG-Address AVP (AVP Code TBD) is of type Address and
contains the IP address of the MAG. This APV is needed in deployment
cases where the NAS (also in authenticator's role) and possibly a
pool of MAGs are not co-located. In this case the AAA request should
contain the IP address of the MAG from where the subsequent PBU for
the registration will originate. The AAA server may use this
information, for example, to select such LMA that already has a SA
set up with the MAG.
4.2. MIP6-Agent-Info
The MIP6-Agent-Info grouped AVP is defined in [3]. This document
reuses the said AVP and its sub-AVPs to carry the LMA IP address
and/or FQDN.
4.3. PMIP6-IPv4-Home-Address
The PMIP6-IPv4-Home-Address AVP (AVP Code TBD) is of type Address and
contains the IPv4-HoA of the MN.
4.4. PMIP6-DHCP-Address
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.
4.5. PMIP6-Home-Prefix
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.
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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
in the request message. The reply message SHOULD in all cases
contain the assigned home prefix value.
4.6. PMIP6-MN-FQDN
The PMIP6-MN-FQDN AVP (AVP Code TBD) is of type DiameterIdentity and
contains the FQDN assigned for the MN.
4.7. MIP6-Feature-Vector
The MIP6-Feature-Vector AVP is originally defined in [3]". This
document only reserves new capability bits according to the rules in
[3]. 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 (0x0000000100000000)
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 (0x0000000200000000)
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. Use of
the IP4_HOA_SUPPORTED bit is also an indication of DSMIPv6 support
[15].
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LOCAL_MAG_ROUTING_SUPPORTED (0x0000000400000000)
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 [16] 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.
DNS_UPDATE_BY_MAG (0x0000001000000000)
The MAG indicates its capability and wish to perform a dynamic DNS
update for recently assigned MN-HoA. If both MAG and LMA set this
bit in the capability exchange, then the MAG is authorized to
perform the dynamic DNS update.
In a case the MN is roaming, it is highly probable that the MAG
won't be authorized to perform a dynamic DNS update. The MAG
belongs to a different administrative domain than the DNS server
hosting the naming information for the MN.
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.
4.8. Chargeable-User-Identity
The Chargeable-User-Identity AVP (AVP Code 89) is of type OctetString
and in a response message contains the mobile node identifier (MN-
Identifier) assigned by the AAA server. The use of the Chargeable-
User-Identity is defined on RFC 4372 [5].
4.9. Calling-Station-Id
The Calling-Station-Id AVP (AVP Code 31) is of type UTF8String and
contains a MAG provided link layer interface identifier of the
interface the MN used to attach to the network. This interface
identifier may correspond to a real physical interface or something
that the MAG has generated. The identifier MUST be unique within the
PMIPv6 domain.
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4.10. Called-Station-Id
The Called-Station-Id AVP (AVP Code 30) 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.
4.11. Session-Timeout
The Session-Timeout AVP (AVP Code 27) is of type Unsigned32 and
contains lifetime of the Binding Cache Entry.
5. MAG to HAAA Interface Application Support, Commands Codes and
Attribute Value Pairs
5.1. Application Support and Command Codes
This document re-uses the Diameter NASREQ [6] and the EAP [7]
applications and their command codes in the same way as defined in
[3]. The MAG acts as a Diameter client.
The MAG to HAAA interface is primarily used for bootstrapping PMIPv6
when a MN attaches and authenticates to the PMIPv6 capable network.
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 message to the HAAA the User-Name
AVP MUST contain the MN identity. The identity MUST be in Network
Access Identifier (NAI) [8] 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 availble prefixes and addresses
as well [17]. 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. Diameter-EAP-Request (DER)
The Diameter-EAP-Request (DER) message [7] is sent by the MAG to the
Diameter server to initiate a network access authentication and
authorization procedure. The DER message format is the same as
defined in [7]. The DER message MAY include optional PMIPv6 MAG to
HAAA interface AVPs:
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<Diameter-EAP-Request> ::= < Diameter Header: 268, REQ, PXY >
< Session-Id >
{ Auth-Application-Id }
{ Origin-Host }
{ Origin-Realm }
{ Destination-Realm }
{ Auth-Request-Type }
...
[ MIP6-Feature-Vector ]
[ PMIP6-MAG-Address ]
[ Chargeable-User-Identity ]
[ Calling-Station-Id ]
[ User-Name ]
[ Destination-Host ]
...
* [ AVP ]
5.3. Diameter-EAP-Answer (DEA)
The Diameter-EAP-Answer (DEA) message defined in [7] is sent in
response to the Diameter-EAP-Request message (DER). The DEA message
format is the same as defined in [7]. If the network access
authentication procedure was successful then the response MAY include
PMIPv6 MAG 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:
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<Diameter-EAP-Answer> ::= < Diameter Header: 268, PXY >
< Session-Id >
{ Auth-Application-Id }
{ Auth-Request-Type }
{ Result-Code }
{ Origin-Host }
{ Origin-Realm }
...
* [ MIP6-Agent-Info ]
[ MIP6-Feature-Vector ]
[ PMIP6-MAG-Address ]
* [ PMIP6-DHCP-Address ]
[ PMIP6-Home-Prefix ]
[ PMIP6-IPv4-Home-Address ]
[ PMIP6-MN-FQDN ]
[ Chargeable-User-Identity ]
[ User-Name ]
[ Framed-IPv6-Prefix ]
[ Framed-IPv4-Address ]
...
* [ AVP ]
5.4. AA-Request (AAR)
The AA-Request (AAR) message [6] is sent by the MAG to the Diameter
server to initiate a network access authentication and authorization
procedure. The AAR message format is the same as defined in [6].
The message MAY include optional PMIPv6 MAG to HAAA interface AVPs:
<AA-Request> ::= < Diameter Header: 265, REQ, PXY >
< Session-Id >
{ Auth-Application-Id }
{ Origin-Host }
{ Origin-Realm }
{ Destination-Realm }
{ Auth-Request-Type }
...
[ MIP6-Feature-Vector ]
[ PMIP6-MAG-Address ]
[ Chargeable-User-Identity ]
[ Calling-Station-Id ]
[ User-Name ]
[ Destination-Host ]
...
* [ AVP ]
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5.5. AA-Answer (AAA)
The AA-Answer (AAA) message is sent in response to the AA-Request
(AAR) message. The AAA message format is the same as defined in [6].
If the network access authentication procedure was successful then
the response MAY include PMIPv6 MAG 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:
<AA-Answer> ::= < Diameter Header: 265, PXY >
< Session-Id >
{ Auth-Application-Id }
{ Auth-Request-Type }
{ Result-Code }
{ Origin-Host }
{ Origin-Realm }
...
* [ MIP6-Agent-Info ]
[ MIP6-Feature-Vector ]
[ PMIP6-MAG-Address ]
* [ PMIP6-DHCP-Address ]
[ PMIP6-Home-Prefix ]
[ PMIP6-IPv4-Home-Address ]
[ Chargeable-User-Identity ]
[ User-Name ]
[ Framed-IPv6-Prefix ]
[ Framed-IPv4-Address ]
...
* [ AVP ]
5.6. Accounting at MAG
The accounting at the MAG to HAAA interface is based on the [6]. The
application identifier used for accounting is the Diameter Base
Accounting (3) [9].
TBD.
6. LMA to HAAA Interface Application Support, Commands Codes and
Attribute Value Pairs
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
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management.
This document re-uses the Diameter NASREQ [6] and EAP [7]
applications and their command codes for the MAG to LMA Security
Association setup. The LMA acts as a Diameter client.
This document defines a new application for the authorization of the
Proxy Binding Updates. The new application identifier is TBD BY
IANA. The new application re-uses the Diameter NASREQ [6] command
codes. The LMA acts as a Diameter client.
6.2. Authorization of the Proxy Binding Update
A new Diameter application is needed for the LMA to HAAA interface
when authorizing Proxy Binding Updates. The new application
identifier is TBD BY IANA. This application re-uses Diameter NASREQ
AAR and AAA command codes.
Whenever the LMA sends a Diameter 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 [18] 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 interface identifier option, the Calling-
Station-Id AVP SHOULD be included in the request message containing
the received interface identifier. Furthermore, if the PBU contains
the Service Selection mobility option [19], the Called-Station-Id AVP
SHOULD be included in the request message containing the received
service identifier.
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 undefined address (::/128) 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 (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.
If the HAAA is not able to authorize the PBU, 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
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permanent failure.
6.2.1. AA-Request (AAR)
The AA-Request (AAR) message [6] is sent by the LMA to the Diameter
server to initiate a network access authentication and authorization
procedure. The AAR message format is the same as defined in [6].
The message MAY include optional PMIPv6 LMA to HAAA interface AVPs:
<AA-Request> ::= < Diameter Header: 265, REQ, PXY >
< Session-Id >
{ Auth-Application-Id }
{ Origin-Host }
{ Origin-Realm }
{ Destination-Realm }
{ Auth-Request-Type }
...
[ MIP6-Agent-Info ]
[ MIP6-Feature-Vector ]
[ PMIP6-MAG-Address ]
[ PMIP6-Home-Prefix ]
[ PMIP6-IPv4-Home-Address ]
[ Calling-Station-Id ]
[ Called-Station-Id ]
[ User-Name ]
...
* [ AVP ]
6.2.2. AA-Answer (AAA)
The AA-Answer (AAA) message is sent in response to the AA-Request
(AAR) message. The AAA message format is the same as defined in [6].
If the network access authentication 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:
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<AA-Answer> ::= < Diameter Header: 265, PXY >
< Session-Id >
{ Auth-Application-Id }
{ Auth-Request-Type }
{ Result-Code }
{ Origin-Host }
{ Origin-Realm }
...
[ MIP6-Feature-Vector ]
[ PMIP6-Home-Prefix ]
[ PMIP6-IPv4-Home-Address ]
[ Session-Timeout ]
[ User-Name ]
...
* [ AVP ]
6.3. MAG to LMA Security Association Setup
Proxy MIPv6 MAG to LMA security is based on IPSec [10] and
Encapsulating Security Payload (ESP) [11] should be used to protect
all traffic between the MAG and the LMA. The SA between the MAG and
the LMA may either be statically configured or created dynamically on
need to basis, depending on the deployment. IKEv2 [14] is
recommended for the creation of the SA. Other solutions are also
possible. The actual creation process of the SA is out of scope of
this specification. The purging of the dynamically created SA can be
explicit or implicit. The decision which purging method to apply is
also specific to a deployment.
Depending on the dynamic SA creation method, either NASREQ or EAP
Diameter applications may be used between the LMA and the home
network AAA. The MAG acts always as the IKE initiator. The identity
used during the authentication is the identity of the MAG.
Therefore, the credentials used for the authentication are also MAG
specific. During the MAG to LMA SA creation the LMA SHOULD include
the IP address of the MAG in the request message.
The dynamic creation of the MAG to LMA SA gets triggered by a MN
trying to attach to a MAG that does not have an exiting SA with the
AAA assigned LMA. The creation of the SA is started after the MN has
successfully authenticated to the PMIPv6 domain. If the creation of
the MAG to LMA tunnel fails for a reason or other, the MAG should use
access technology specific mechanisms to detach the MN from the
network. Cases where the access authentication completes
successfully but the SA creation between the MAG and the LMA fails is
usually a consequence of misconfiguration.
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6.4. Accounting at LMA
The accounting at the LMA to HAAA interface is based on the [6]. The
application identifier used for accounting is the Diameter Base
Accounting (3) [9].
TBD.
7. Proxy Mobile IPv6 Session Management
Concerning a PMIPv6 session, the AAAH MAY maintain a state. The LMA
and the MAG MUST support the Authorization Session State Machine
defined in [9]. 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.
7.1. Session Termination Request - Command
The LMA or the MAG MAY send the Session-Termination-Request (STR)
command [9] to the HAAA and inform the termination of an ongoing
PMIPv6 session is in progress.
7.2. Session Termination Answer - Command
The Session-Termination-Answer (STA) [9] is sent by the HAAA to
acknowledge the termination of a PMIPv6 session.
7.3. Abort Session Request - Command
The HAAA MAY send the Abort-Session-Request (ACR) command [9] to the
LMA or to the MAG and request termination of a PMIPv6 session.
7.4. Abort Session Answer - Command
The Abort-Session-Answer (ASA) command [9]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 [3].
The Figure 2 contains the AVPs and their occurrences on the MAG to
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HAAA interface. The AVPs that are part of grouped AVP are not listed
in the table, rather only the grouped AVP is listed.
+---------------------------+
| Command-Code |
|-------+-------+-----+-----+
Attribute Name | DER | DEA | AAR | AAA |
-------------------------------+-------+-------+-----+-----+
PMIP6-MAG-Address | 0-1 | 0-1 | 0-1 | 0-1 |
PMIP6-DHCP-Address | 0 | 0+ | 0 | 0+ |
MIP6-Agent-Info | 0 | 0+ | 0 | 0+ |
MIP6-Feature-Vector | 0-1 | 0-1 | 0-1 | 0-1 |
PMIP6-IPv4-Home-Address | 0 | 0-1 | 0 | 0-1 |
PMIP6-MN-FQDN | 0 | 0-1 | 0 | 0-1 |
PMIP6-Home-Prefix | 0 | 0-1 | 0 | 0-1 |
Chargeable-User-Identity | 0-1 | 0-1 | 0-1 | 0-1 |
Calling-Station-Id | 0-1 | 0 | 0-1 | 0 |
+-------+-------+-----+-----+
Figure 2: MAG to HAAA Interface DER, DEA, AAR and AAA Commands AVPs
The Figure 3 contains the AVPs and their occurrences on the LMA to
HAAA interface. The AVPs that are part of grouped AVP are not listed
in the table, rather only the grouped AVP is listed. This interface
is essentially for authorizing the PBU, not for the dynamic creation
of the MAG to LMA SA.
+---------------+
| Command-Code |
|-------+-------+
Attribute Name | AAR | AAA |
-------------------------------+-------+-------+
PMIP6-MAG-Address | 0-1 | 0 |
PMIP6-IPv4-Home-Address | 0-1 | 0-1 |
PMIP6-Home-Prefix | 0-1 | 0-1 |
PMIP6-MN-FQDN | 0 | 0-1 |
MIP6-Agent-Info | 0-1 | 0 |
MIP6-Feature-Vector | 0-1 | 0-1 |
Session-Timeout | 0 | 0-1 |
Chargeable-User-Id | 0-1 | 0 |
Calling-Station-Id | 0-1 | 0 |
Called-Station-Id | 0-1 | 0 |
+-------+-------+
Figure 3: LMA to HAAA Interface AAR and AAA Commands AVPs
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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 [9] 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|
------------------------------------------+----+-----+----+-----+----+
PMIP6-MAG-Address TBD 4.1 Address | | P,M | | V | Y |
MIP6-Agent-Info TBD 4.2 Grouped | | P,M | | V | Y |
PMIP6-IPv4-Home- | | | | | |
Address TBD 4.3 Address | | P,M | | V | Y |
PMIP6-DHCP-Address TBD 4.4 Address | | | | V | Y |
PMIP6-Home-Prefix TBD 4.5 Address | | P,M | | V | Y |
PMIP6-MN-FQDN TBD 4.6 DiamIdent | | P,M | | V | Y |
MIP6-Feature- | | | | | |
Vector TBD 4.7 Unsigned64| | P,M | | V | Y |
Chargeable-User- | | | | | |
Identity 89 4.8 OctetStr | | P,M | | V | Y |
Calling-Station-Id 31 4.9 UTF8String| | P,M | | V | Y |
Called-Station-Id 30 4.10 UTF8String| | P,M | | V | Y |
Session-Timeout 27 4.11 Unsigned32| | P,M | | 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-MAG-Address is set to TBD
PMIP6-DHCP-Address is set to TBD
PMIP6-MN-FQDN is set to TBD
PMIP6-Home-Prefix is set to TBD
PMIP6-IPv4-Home-Address is set to TBD
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9.2. Namespaces
This specification defines new values to the Mobility Capability
registry (see [3]) for use with the MIP6-Feature-Vector AVP:
Token | Value | Description
----------------------------------+----------------------+------------
PMIP6_SUPPORTED | 0x0000000100000000 | [RFC TBD]
IP4_HOA_SUPPORTED | 0x0000000200000000 | [RFC TBD]
LOCAL_MAG_ROUTING_SUPPORTED | 0x0000000400000000 | [RFC TBD]
DNS_UPDATE_BY_MAG | 0x0000001000000000 | [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 [9].
9.4. 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 [9]:
DIAMETER_PMIP6_AUTHORIZATION_FAILED is set to TBD
10. Security Considerations
TBD
11. Acknowledgements
Jouni Korhonen would like to thank TEKES MERCoNe project for
providing funding to work on this document.
12. References
12.1. Normative References
[1] Gundavelli, S., Leung, K., Devarapalli, V., Chowdhury, K., and
B. Patil, "Proxy Mobile IPv6", draft-ietf-netlmm-proxymip6-07
(work in progress), November 2007.
[2] Wakikawa, R. and S. Gundavelli, "IPv4 Support for Proxy Mobile
IPv6", draft-ietf-netlmm-pmip6-ipv4-support-02 (work in
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progress), November 2007.
[3] 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-07 (work in progress),
November 2007.
[4] Bradner, S., "Key words for use in RFCs to Indicate Requirement
Levels", BCP 14, RFC 2119, March 1997.
[5] Adrangi, F., Lior, A., Korhonen, J., and J. Loughney,
"Chargeable User Identity", RFC 4372, January 2006.
[6] Calhoun, P., Zorn, G., Spence, D., and D. Mitton, "Diameter
Network Access Server Application", RFC 4005, August 2005.
[7] Eronen, P., Hiller, T., and G. Zorn, "Diameter Extensible
Authentication Protocol (EAP) Application", RFC 4072,
August 2005.
[8] Aboba, B., Beadles, M., Arkko, J., and P. Eronen, "The Network
Access Identifier", RFC 4282, December 2005.
[9] Calhoun, P., Loughney, J., Guttman, E., Zorn, G., and J. Arkko,
"Diameter Base Protocol", RFC 3588, September 2003.
[10] Kent, S. and K. Seo, "Security Architecture for the Internet
Protocol", RFC 4301, December 2005.
[11] Kent, S., "IP Encapsulating Security Payload (ESP)", RFC 4303,
December 2005.
12.2. Informative References
[12] Manner, J. and M. Kojo, "Mobility Related Terminology",
RFC 3753, June 2004.
[13] Aboba, B., Blunk, L., Vollbrecht, J., Carlson, J., and H.
Levkowetz, "Extensible Authentication Protocol (EAP)",
RFC 3748, June 2004.
[14] Kaufman, C., "Internet Key Exchange (IKEv2) Protocol",
RFC 4306, December 2005.
[15] Soliman, H., "Mobile IPv6 support for dual stack Hosts and
Routers (DSMIPv6)", draft-ietf-mip6-nemo-v4traversal-05 (work
in progress), July 2007.
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[16] Johnson, D., Perkins, C., and J. Arkko, "Mobility Support in
IPv6", RFC 3775, June 2004.
[17] Damic, D., "Proxy Mobile IPv6 indication and discovery",
draft-damic-netlmm-pmip6-ind-discover-01 (work in progress),
June 2007.
[18] Patel, A., Leung, K., Khalil, M., Akhtar, H., and K. Chowdhury,
"Mobile Node Identifier Option for Mobile IPv6 (MIPv6)",
RFC 4283, November 2005.
[19] Korhonen, J., Nilsson, U., and V. Devarapalli, "Service
Selection for Mobile IPv6", draft-korhonen-mip6-service-05
(work in progress), November 2007.
Authors' Addresses
Jouni Korhonen (editor)
TeliaSonera
Teollisuuskatu 13
Sonera FIN-00051
Finland
Email: jouni.korhonen@teliasonera.com
Julien Bournelle
France Telecom R&D
38-4O rue du general Leclerc
Issy-Les-Moulineaux 92794
France
Email: julien.bournelle@orange-ftgroup.com
Kuntal Chowdhury
Starent Networks
30 International Place
Tewksbury MA 01876
US
Phone: +1 214 550 1416
Email: kchowdhury@starentnetworks.com
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Ulrike Meyer
Nokia Siemens Networks
Otto-Hahn-Ring 6
Munich, Bavaria 81739
Germany
Email: ulrike.meyer@nsn.com
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