netext F. Xia Internet-Draft B. Sarikaya Intended status: Standards Track Huawei USA Expires: February 18, 2012 J. Korhonen Nokia Siemens Networks S. Gundavelli Cisco D. Damic Siemens August 17, 2011 RADIUS Support for Proxy Mobile IPv6 draft-ietf-netext-radius-pmip6-04 Abstract This document defines new attributes to facilitate Proxy Mobile IPv6 operations using the RADIUS infrastructure. The RADIUS interactions between the mobile access gateway and the RADIUS-based AAA server take place when the Mobile Node attaches, authenticates and authorizes to a Proxy Mobile IPv6 domain. Furthermore, this document defines the RADIUS-based interface between the local mobility anchor and the AAA RADIUS server for authorizing received Proxy Binding Update messages for the mobile node's mobility session. In addition to the mobility session setup related interactions, this document defines the baseline for the mobile access gateway and the local mobility anchor generated accounting. Status of this Memo This Internet-Draft is submitted in full conformance with the provisions of BCP 78 and BCP 79. Internet-Drafts are working documents of the Internet Engineering Task Force (IETF). Note that other groups may also distribute working documents as Internet-Drafts. The list of current Internet- Drafts is at http://datatracker.ietf.org/drafts/current/. Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet-Drafts as reference material or to cite them other than as "work in progress." This Internet-Draft will expire on February 18, 2012. Copyright Notice Xia, et al. Expires February 18, 2012 [Page 1] Internet-Draft RADIUS-PMIPv6 August 2011 Copyright (c) 2011 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 publication of this document. Please review these documents carefully, as they describe your rights and restrictions with respect to this document. Code Components extracted from this document must include Simplified BSD License text as described in Section 4.e of the Trust Legal Provisions and are provided without warranty as described in the Simplified BSD License. Xia, et al. Expires February 18, 2012 [Page 2] Internet-Draft RADIUS-PMIPv6 August 2011 Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 4 2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 4 3. Solution Overview . . . . . . . . . . . . . . . . . . . . . . 5 4. Attribute definitions . . . . . . . . . . . . . . . . . . . . 9 4.1. MIP6-Feature-Vector . . . . . . . . . . . . . . . . . . . 9 4.2. Mobile-Node-Identifier . . . . . . . . . . . . . . . . . . 10 4.3. Service-Selection . . . . . . . . . . . . . . . . . . . . 11 4.4. PMIP6-Home-LMA-IPv6-Address . . . . . . . . . . . . . . . 11 4.5. PMIP6-Visited-LMA-IPv6-Address . . . . . . . . . . . . . . 12 4.6. PMIP6-Home-LMA-IPv4-Address . . . . . . . . . . . . . . . 13 4.7. PMIP6-Visited-LMA-IPv4-Address . . . . . . . . . . . . . . 14 4.8. PMIP6-Home-HN-Prefix . . . . . . . . . . . . . . . . . . . 15 4.9. PMIP6-Visited-HN-Prefix . . . . . . . . . . . . . . . . . 16 4.10. PMIP6-Home-Interface-ID . . . . . . . . . . . . . . . . . 17 4.11. PMIP6-Visited-Interface-ID . . . . . . . . . . . . . . . . 18 4.12. PMIP6-Home-IPv4-HoA . . . . . . . . . . . . . . . . . . . 19 4.13. PMIP6-Visited-IPv4-HoA . . . . . . . . . . . . . . . . . . 20 4.14. PMIP6-Home-DHCP4-Server-Address . . . . . . . . . . . . . 21 4.15. PMIP6-Visited-DHCP4-Server-Address . . . . . . . . . . . . 22 4.16. PMIP6-Home-DHCP6-Server-Address . . . . . . . . . . . . . 23 4.17. PMIP6-Visited-DHCP6-Server-Address . . . . . . . . . . . . 23 4.18. Calling-Station-Id . . . . . . . . . . . . . . . . . . . . 24 4.19. Chargeable-User-Identity . . . . . . . . . . . . . . . . . 24 5. MAG to RADIUS AAA interface . . . . . . . . . . . . . . . . . 25 5.1. Interface operations . . . . . . . . . . . . . . . . . . . 25 5.2. Table of Attributes . . . . . . . . . . . . . . . . . . . 25 6. LMA to RADIUS AAA interface . . . . . . . . . . . . . . . . . 27 6.1. Interface operations . . . . . . . . . . . . . . . . . . . 27 6.2. Table of Attributes . . . . . . . . . . . . . . . . . . . 27 7. Accounting . . . . . . . . . . . . . . . . . . . . . . . . . . 28 7.1. Accounting at LMA . . . . . . . . . . . . . . . . . . . . 28 7.2. Accounting at MAG . . . . . . . . . . . . . . . . . . . . 28 7.3. Table of Attributes . . . . . . . . . . . . . . . . . . . 28 8. Security Considerations . . . . . . . . . . . . . . . . . . . 30 9. IANA consideration . . . . . . . . . . . . . . . . . . . . . . 30 9.1. Attribute Type Codes . . . . . . . . . . . . . . . . . . . 30 9.2. Namespaces . . . . . . . . . . . . . . . . . . . . . . . . 30 10. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 31 11. References . . . . . . . . . . . . . . . . . . . . . . . . . . 32 11.1. Normative References . . . . . . . . . . . . . . . . . . . 32 11.2. Informative references . . . . . . . . . . . . . . . . . . 32 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 33 Xia, et al. Expires February 18, 2012 [Page 3] Internet-Draft RADIUS-PMIPv6 August 2011 1. Introduction Proxy Mobile IPv6 (PMIPv6) [RFC5213] is a network-based mobility management protocol which allows IP mobility support for a mobile node without requiring the mobile node's participation in any mobility-related signaling. The mobile management elements in the network, the mobile access gateway (MAG) and the local mobility anchor (LMA) are the two key functions in this network-based mobility system. The mobile access gateway is responsible for detecting the mobile node's movements in the network and for initiating the needed mobility management signaling with the local mobility anchor (LMA). Both the mobility management agents make use of the AAA infrastructure to retrieve the mobile node's Policy Profile and for performing service authorization. This document defines a RADIUS-based [RFC2865] profile and corresponding attributes to be used on the AAA interface between the MAG and the AAA RADIUS server. This interface is used to carry the per-MN Policy Profile from the remote Policy Store to the MAG. Furthermore, this document also defines a RADIUS-based interface between the LMA and the AAA RADIUS server for authorization of the received Proxy Mobile IPv6 signaling messages. The AAA procedures defined in this document cover the following two scenarios: o a mobile node connects to the Proxy Mobile IPv6 domain from the home network o a mobile node connects to the Proxy Mobile IPv6 domain from a visitor network 2. Terminology The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in [RFC2119]. All the mobility related terms used in this document are to be interpreted as defined in the Proxy Mobile IPv6 specification [RFC5213] and [RFC5844]. Additionally, this document uses the following abbreviations: Network Access Server (NAS): A function that provides authorization services for a device/user access to the network as defined in [RFC2865]. In the context of this document, the NAS function is logically coupled with the MAG. In deployments where the NAS function and the MAG functions are Xia, et al. Expires February 18, 2012 [Page 4] Internet-Draft RADIUS-PMIPv6 August 2011 decoupled, the specific interactions needed for that to work is outside the scope of this document. Home AAA (HAAA): An Authentication, Authorization, and Accounting (AAA) server located in MN's home network. This sever has access to mobile node's policy profiles. Visited AAA (VAAA): An Authentication, Authorization, and Accounting (AAA) server located in MN's visited network. The VAAA server takes the role of a proxy-server, forwarding the received AAA service request to the HAAA server in the mobile node's home network and relaying the response to the requesting node, after applying any local access network policies. 3. Solution Overview This document defines the RADIUS-based AAA interactions with the two mobility management elements in the Proxy Mobile IPv6 domain. o Interactions between a MAG and a RADIUS-based AAA Server o Interactions between a LMA and a RADIUS-based AAA Server The mobile node's Policy Profile [RFC5213] is present in a policy store and is needed by the PMIPv6 mobility management elements for authorizing the mobile node for mobility management service and for obtaining various service related parameters. This policy store could be locally collocated with the mobility management agents enabling direct local access, or could be available from a AAA server through a RADIUS-based AAA interface. Any time a mobile node attaches to an access network, the NAS on that access network may activate the network access authentication procedure. The choice of the authentication mechanism is specific to the access network deployment, however it is typically based on the Extensible Authentication Protocol (EAP) [RFC3748]. The NAS performs the network access authentication and queries the HAAA using AAA protocol, such as RADIUS. If the network access authentication succeeds, the MN is identified and its Policy Profile is obtained as part of the RADIUS message exchange with the AAA server. The mobile node may be an IPv4-only node, IPv6-only node, or a dual- stack (IPv4/v6) node. Based on the policy specified in the Policy Xia, et al. Expires February 18, 2012 [Page 5] Internet-Draft RADIUS-PMIPv6 August 2011 Profile, the network access authentication procedure SHALL provide the unambiguous indication of the type of address(es) to be assigned for the MN in the network and with all other service related and policy parameters relevant to the mobility service. After the successful network access authentication and after obtaining the mobile node's Policy Profile, the MAG sends a PBU to the LMA. Upon receiving the PBU, the LMA interacts with the HAAA for obtaining the mobile node's Policy Profile, needed for authorizing and setting up the mobility service. This document adds support for three distinct PMIPv6 mobility use cases, taking into account the administrative domains to which the MAG and the LMA belong to. Following are the three relevant deployment models. 1. the MAG and LMA are both in the home network, 2. the MAG and LMA are both in the visited network 3. the MAG is in the visited network while the LMA is in the home network. Figure 1 shows participating network entities for the PMIPv6 mobility session which is located in the home network. The MAG and LMA interact only with the HAAA. +--------+ | HAAA & | RADIUS +-----+ | Policy |<-------->| LMA | | Profile| +-----+ +--------+ | <--- LMA-Address ^ | | // \\ +---|------------- //---\\----------------+ ( | IPv4/IPv6 // \\ ) ( | Network // \\ ) +---|-----------//---------\\-------------+ | // \\ RADIUS // <- Tunnel1 \\ <- Tunnel2 | // \\ | |- MAG1-Address |- MAG2-Address | +----+ +----+ +---->|MAG1| |MAG2| +----+ +----+ | | | | MN1 MN2 Xia, et al. Expires February 18, 2012 [Page 6] Internet-Draft RADIUS-PMIPv6 August 2011 Figure 1: The MAG and LMA are both in the home network Figure 2 shows both the LMA and MAG are in the visited network. The MAG and LMA exchange signaling with the HAAA through the VAAA which acts as a Proxy. The visited network may append additional information to the HAAA replies in order to reflect the local policy. +---------------+ | HAAA & | +----------| Policy Profile| | +---------------+ | +--------+ | VAAA & | RADIUS +-----+ | Policy |<-------->| LMA | | Profile| +-----+ +--------+ | <--- LMA-Address ^ // \\ +---|------------- //---\\----------------+ ( | IPv4/IPv6 // \\ ) ( | Network // \\ ) +---|-----------//---------\\-------------+ | // \\ RADIUS // <- Tunnel1 \\ <- Tunnel2 | // \\ | |- MAG1-Address |- MAG2-Address | +----+ +----+ +---->|MAG1| |MAG2| +----+ +----+ | | MN1 MN2 Figure 2: The MAG and LMA are both in the visited network Figure 3 illustrates topology where MAG resides in the visited network while the associated LMA is in MN's home network. Any message between the MAG and the HAAA passes through the VAAA that acts as a Proxy. During the network authentication, the visited network's specific policy may also be propagated from the VAAA to the MAG. The LMA has a direct access to the HAAA. Xia, et al. Expires February 18, 2012 [Page 7] Internet-Draft RADIUS-PMIPv6 August 2011 +---------------+ | HAAA & | +----------| Policy Profile| | +---------------+ | | | RADIUS +--------+ | | VAAA & | +-----+ | Policy | | LMA | | Profile| +-----+ +--------+ | <--- LMA-Address ^ // \\ +---|------------- //---\\----------------+ ( | IPv4/IPv6 // \\ ) ( | Network // \\ ) +---|-----------//---------\\-------------+ | // \\ RADIUS // <- Tunnel1 \\ <- Tunnel2 | // \\ | |- MAG1-Address |- MAG2-Address | +----+ +----+ +---->|MAG1| |MAG2| +----+ +----+ | | MN1 MN2 Figure 3: Visited MAG and home LMA topology Xia, et al. Expires February 18, 2012 [Page 8] Internet-Draft RADIUS-PMIPv6 August 2011 4. Attribute definitions 4.1. MIP6-Feature-Vector Diameter [RFC3588] reserves AVP Code space 1-255 as RADIUS attribute compatibility space. The MIP6-Feature-Vector AVP (AVP Code 124) defined in [RFC5447] is of type OctetString and contains a 64-bit flags field of supported mobility capabilities. This document reserves a new capability bit according to the rules in [RFC5447], and reuses the PMIPv6 capability bits defined by [RFC5779]. The following capability flag bits are used or defined in this document: PMIP6_SUPPORTED (0x0000010000000000) This capability bit is used as defined in [RFC5779]. IP4_HOA_SUPPORTED (0x0000020000000000) This capability bit is used as defined in [RFC5779]. Assignment of the IPv4-HoA is defined by [RFC5844]. LOCAL_MAG_ROUTING_SUPPORTED (0x0000040000000000) This capability bit is used as defined in [RFC5779]. IP4_TRANSPORT_SUPPORTED (0x0000080000000000) This capability bit is used for negotiation of the IPv4 transport support between the MAG and AAA. When the MAG sets this flag bit in the MIP6-Feature-Vector, it indicates ability of the MAG to provide IPv4 transport (i.e., IPv4-based encapsulation) for carrying IP traffic between the MAG and the LMA. If this flag bit is unset in the returned MIP6-Feature-Vector AVP, the AAA does not authorize the use of IPv4 transport on the MAG-to-LMA tunnel. IP4_HOA_ONLY_SUPPORTED (0x0000100000000000) This capability bit is used for determination of the authorized PMIPv6 mobility mode. When this bit is set by the AAA it indicates PMIPv6 mobility with IPv4 support has only been authorized for the MN. As a result, the RADIUS Access-Accept SHOULD NOT carry the IPv6 HNP. When this bit is set the PMIP6_SUPPORTED flag MUST also be set, and the IP4_HOA_SUPPORTED flag MUST NOT be set. Xia, et al. Expires February 18, 2012 [Page 9] Internet-Draft RADIUS-PMIPv6 August 2011 The MIP6-Feature-Vector attribute is also used on the LMA to the RADIUS AAA interface. This capability announcement attribute enables direct capability negotiation between the LMA and the AAA. The capabilities that are announced by both parties in the MIP6-Feature- Vector are known to be mutually supported. The LMA may use this mechanism during authorization of the received PBU against the AAA to check individual PMIPv6 feature permissions for a particular MN. 4.2. Mobile-Node-Identifier The Mobile-Node-Identifier attribute (AVP Code TBD) is of type String and contains the mobile node identifier (MN-Identifier), see [RFC5213]), in a form of a NAI [RFC4282]. This identifier and the identifier used for access authentication may be different, however, there needs to be a mapping between the two identities as specified in Sectin 6.6 of [RFC5213]) This AVP is used on the interface between MAG and the AAA server. The Mobile-Node-Identifier attribute is designed for deployments where the identity used during Network Access Authentication and the identity used for mobility management is decoupled. It may also be the case where the MAG does not have means to find out the MN identity that could be used in subsequent PBU/PBA exchanges (e.g., due to identity hiding during the network access authentication) or when the HAAA wants to assign periodically changing identities to the MN. The Mobile-Node-Identifier attribute MAY be returned by HAAA in the RADIUS Access-Accept message that completes a successful authentication and authorization exchange between the MAG and the HAAA. If the MAG has not acquired a valid MN-Identifier by other means, it MUST use the received MN-Identifier. 0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Type | Length | Mobile Node Identifier... ~ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Type: Mobile-Node-Identifier to be defined by IANA. Length: >= 3 octets Mobile Node Identifier: This field is of type String and contains the MN-ID of the MN to be used in the PBU/PBA exchange. Xia, et al. Expires February 18, 2012 [Page 10] Internet-Draft RADIUS-PMIPv6 August 2011 4.3. Service-Selection The Service-Selection attribute (AVP Code TBD) contains the name of the service or the external network that the mobility service for the particular MN SHOULD be associated with [RFC5149]. The identifier MUST be unique within the PMIPv6 Domain. The MAG MUST include the Service-Selection attribute in the Access- Request sent to the AAA if the information was acquired. The AAA MAY return the Service-Selection to the MAG even if it was not included in the Access-Request as means to indicate MN's default service to the MAG. On the LMA-to-AAA interface, the LMA MAY populate the Service- Selection attribute in the Access-Request message using the service information found in the received PBU, if such mobility option was included. The Service-Selection identifier should be used to assist the PBU authorization, the assignment of the MN-HNP and the IPv4-MN- HoA as described in [RFC5149] and [RFC5779]. 0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Type | Length | Service Identifier... +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Type: Service-Selection to be defined by IANA. Length: >= 3 octets Text: This field is of type UTF8String and contains the Service Identifier the MN is associated with. 4.4. PMIP6-Home-LMA-IPv6-Address This attribute (AVP Code TBD) is used to deliver the IPv6 address of the LMA located in the Home network. Before the MAG can engage in Proxy Mobile IPv6 signaling it must be aware of the LMA's IP address. When the LMA is assigned to the MN from the home network, this attribute MAY be sent by the HAAA to the MAG in the RADIUS Access- Xia, et al. Expires February 18, 2012 [Page 11] Internet-Draft RADIUS-PMIPv6 August 2011 Accept message. 0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Type | Length | Home LMA IPv6 address +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ . . . +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ . . . +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ . . . +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Home LMA IPv6 address | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Type: PMIP6-Home-LMA-IPv6-Address to be defined by IANA. Length: = 18 octets Home LMA IPv6 address: 128-bit IPv6 address of the assigned home LMA IPv6 address. 4.5. PMIP6-Visited-LMA-IPv6-Address This attribute (AVP Code TBD) is used to propose a particular LMA in the Visited network, and to authorize the use of the LMA in the Visited network. PMIP6-Visited-LMA-IPv6-Address attribute MAY be included by the MAG to VAAA in the RADIUS Access-Request packet as a proposal to allocate the particular LMA to the MN. The LMA in the visited network may be assigned by the visited AAA as the result of retrieved Policy Profile. If included by VAAA in the RADIUS Access-Accept sent to the MAG, the use of the LMA in the visited network is authorized and the attribute SHALL carry the IPv6 address of the visited LMA assigned for the particular MN. The AVP SHOULD NOT be included if the use of LMA in the Home Network is authorized (AVP PMIP6-Home-LMA-IPv6-Address already present). Xia, et al. Expires February 18, 2012 [Page 12] Internet-Draft RADIUS-PMIPv6 August 2011 0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Type | Length | Visited LMA IPv6 address +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ . . . +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ . . . +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ . . . +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Visited LMA IPv6 address | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Type: PMIP6-Visited-LMA-IPv6-Address to be defined by IANA. Length: = 18 octets Visited LMA IPv6 address: 128-bit IPv6 address of the assigned visited LMA IPv6 address. 4.6. PMIP6-Home-LMA-IPv4-Address The PMIP6-Home-LMA-IPv4-Address attribute (AVP Code TBD) contains the IPv4 address of the LMA assigned by the HAAA. The [RFC5844] supports Proxy Mobile IPv6 signaling exchange between MAG and LMA using the IPv4 transport. When the LMA is located in the home network, this attribute MAY be sent by the HAAA to the MAG in the RADIUS Access-Accept message. Xia, et al. Expires February 18, 2012 [Page 13] Internet-Draft RADIUS-PMIPv6 August 2011 0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Type | Length | Home LMA IPv4 address +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Home LMA IPv4 address | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Type: PMIP6-Home-LMA-IPv4-Address to be defined by IANA. Length: = 6 octets Home LMA IPv4 address: 32-bit IPv4 address of the assigned LMA. 4.7. PMIP6-Visited-LMA-IPv4-Address This attribute (AVP Code TBD) is used to propose a particular LMA in the Visited network, and to authorize the use of the LMA in the Visited network. PMIP6-Visited-LMA-IPv4-Address attribute MAY be included by the MAG to VAAA in the RADIUS Access-Request packet as a proposal to allocate the particular LMA to the MN. The LMA in the visited network may be assigned by the visited AAA as the result of retrieved Policy Profile. If included by VAAA in the RADIUS Access-Accept sent to the MAG, the use of the LMA in the visited network is authorized and the attribute SHALL carry the IPv4 address of the assigned visited LMA. The AVP SHOULD NOT be included if the use of LMA in the Home Network is authorized (AVP PMIP6-Home-LMA-IPv4-Address already present). Xia, et al. Expires February 18, 2012 [Page 14] Internet-Draft RADIUS-PMIPv6 August 2011 0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Type | Length | Visited LMA IPv4 address +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Visited LMA IPv4 address | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Type: PMIP6-Visited-LMA-IPv4-Address to be defined by IANA. Length: = 6 octets IPv4 LMA address: 32-bit IPv4 address of the assigned LMA. 4.8. PMIP6-Home-HN-Prefix Mobile Node's Home Network Prefix (MN-HNP) is the IPv6 prefix (i.e., the high 64 bits) assigned to the link between the MN and the MAG. The MN configures its IP interface from its home network prefix(es). When the LMA is located in the home network, PMIP6-Home-HN-Prefix attribute (AVP Code TBD) is used to deliver the MN-HNP from the HAAA to the MAG. The PMIP6-Home-HN-Prefix attribute is also used on the LMA-to-HAAA interface containing the prefix assigned to the MN. If the LMA delegates the MN-HNP assignment to the HAAA, the attribute MUST contain all zeroes address (i.e., 0::0) in the Access-Request message. The attribute MUST be present in RADIUS Access-Accept if the prior request already included one, and SHOULD carry the MN-HNP the HAAA assigned to the MN. Xia, et al. Expires February 18, 2012 [Page 15] Internet-Draft RADIUS-PMIPv6 August 2011 0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Type | Length | Reserved | Prefix-Length | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Home MN-HNP +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Home MN-HNP | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Type: PMIP6-Home-HN-Prefix to be defined by IANA. Length: = 12 octets. Reserved: Reserved for future use. The bits MUST be set to zero by the sender, and MUST be ignored by the receiver. Prefix-Length: This field indicates the prefix length of the Home Network Prefix (maximum 8 octets). Home Network Prefix: Home Network Prefix for the MN's IPv6 address configuration. 4.9. PMIP6-Visited-HN-Prefix When the LMA is assigned from the visited network, PMIP6-Visited-HN- Prefix attribute (AVP Code TBD) is used to deliver the concerning MN- HNP from the VAAA to the MAG. The PMIP6-Visited-HN-Prefix attribute is also used on the LMA to VAAA interface containing the IPv6 prefix assigned to the MN. If the LMA delegates the assignment of the MN-HNP to the VAAA, the AVP MUST contain all zeroes address (i.e., 0::0) in the RADIUS Access-Request. The attribute MUST be present in Access-Accept if the prior request already included one, and SHOULD carry the MN-HNP the VAAA assigned to the MN. Xia, et al. Expires February 18, 2012 [Page 16] Internet-Draft RADIUS-PMIPv6 August 2011 0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Type | Length | Reserved | Prefix-Length | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Visited MN-HNP +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Visited MN-HNP | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Type: PMIP6-Visited-HN-Prefix to be defined by IANA. Length: = 12 octets. Reserved: Reserved for future use. The bits MUST be set to zero by the sender, and MUST be ignored by the receiver. Prefix-Length: This field indicates the prefix length of the Visited MN-HNP (maximum 8 octets). Visited Home Network Prefix: Home Network Prefix for the MN's IPv6 address configuration. 4.10. PMIP6-Home-Interface-ID For Proxy Mobile IPv6 the Home Network Prefixes assigned to the mobile node have to be maintained on a per-interface basis. When the LMA is located in the home network, PMIP6-Home-Interface-ID attribute conveys 64 bits interface identifier representing a particular MN's interface. The attribute is assigned by the HAAA to the MAG for derivation of the MN-HoA. This attribute MAY be sent by the LMA or the MAG to the HAAA in the RADIUS Access-Request packet as a proposal. This attribute MAY be sent by HAAA to the LMA in an Access-Accept packet, however it MUST be present if the prior request already included one. Xia, et al. Expires February 18, 2012 [Page 17] Internet-Draft RADIUS-PMIPv6 August 2011 0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Type | Length | Home Interface Identifier +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Home Interface Identifier +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Home Interface Identifier | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Type: PMIP6-Home-Interface-ID to be defined by IANA. Length: = 10 octets. Home Interface Identifier: The home interface identifier field is 8 octets. 4.11. PMIP6-Visited-Interface-ID For Proxy Mobile IPv6 the visited Home Network Prefixes assigned to the mobile node have to be maintained on a per-interface basis. When the LMA is located in the visited network, the attribute conveys 64 bits interface identifier representing a particular MN's interface. The attribute is assigned by the VAAA to MAG for the derivation of MN-HoA. This attribute MAY be sent by the LMA or the MAG to the VAAA in an Access-Request packet as a proposal. This attribute MAY be sent by HAAA to the LMA in an Access-Accept packet, however it MUST be present if the prior request already included one. Xia, et al. Expires February 18, 2012 [Page 18] Internet-Draft RADIUS-PMIPv6 August 2011 0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Type | Length | Visited Interface Identifier +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Visited Interface Identifier +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Visited Interface Identifier | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Type: PMIP6-Visited-Interface-ID to be defined by IANA. Length: = 10 octets. Visited Interface Identifier: The visited interface identifier field is 8 octets. 4.12. PMIP6-Home-IPv4-HoA [RFC5844] specifies extensions to Proxy Mobile IPv6 protocol which enable IPv4 home address mobility support to the MN. The PMIP6-Home- IPv4-HoA attribute (AVP Code TBD) is of type Address and contains the IPv4 Home Address of the MN. The primary use of this attribute is to deliver the assigned IPv4-HoA from HAAA to the MAG. The PMIP6-Home-IPv4-HoA is also used on the LMA-to-HAAA interface. If the LMA in the home network delegates the assignment of the IPv4- HoA to the HAAA, the attribute MUST contain all zeroes address in the request message. The attribute MUST be included in by HAAA in the response if the previous request included it, and it contains the IPv4-HoA assigned to the MN. Xia, et al. Expires February 18, 2012 [Page 19] Internet-Draft RADIUS-PMIPv6 August 2011 0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Type | Length | Reserved |Prefix-Len | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Home IPv4 HoA | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Type: PMIP6-Home-IPv4-HoA to be defined by IANA. Length: = 8 octets Reserved The 10-bit field reserved for future use. Value MUST be initialized to zero by sender, and MUST be ignored by the receiver. Prefix-Len The 6-bit unsigned integer indicating the prefix length of the trailing IPv4 HoA Home IPv4 HoA: This field is of type Address and contains the IPv4 home address of the MN in the home network. 4.13. PMIP6-Visited-IPv4-HoA When both MAG and the LMA are in the visited network, the PMIP6- Visited-IPv4-HoA attribute (AVP Code TBD) is used to exchange information between the VAAA and the MAG on the assignment of the IPv4 Home Address to the MN being present in the Visited network. The PMIP6-Visited-IPv4-HoA is also used on the LMA-to-VAAA interface. If the LMA delegates the assignment of the IPv4-HoA to the VAAA, the attribute MUST contain all zeroes address in the RADIUS Access- Request. The Access-Accept message MUST have the attribute present if the prior request to VAAA already included one. Xia, et al. Expires February 18, 2012 [Page 20] Internet-Draft RADIUS-PMIPv6 August 2011 0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Type | Length | Reserved |Prefix-Len | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Visited IPv4 HoA | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Type: PMIP6-Visited-IPv4-HoA to be defined by IANA. Length: = 8 octets Reserved: The 10-bit field reserved for future use. Value MUST be initialized to zero by the sender, and MUST be ignored by the receiver. Prefix-Len: 6-bit unsigned integer indicating the prefix length of the trailing IPv4 HoA Visited IPv4 HoA: This field is of type Address and contains the IPv4 home address of the MN in the visited network. 4.14. PMIP6-Home-DHCP4-Server-Address The PMIP6-Home-DHCP4-Server-Address (AVP Code TBD) contains the IPv4 address of the DHCPv4 server in the home network. The particular DHCP server address is indicated to the MAG that serves the concerning MN. The HAAA MAY assign a DHCP server to the MAG in deployments where the MAG acts as a DHCP Relay, as defined in [RFC5844]. Xia, et al. Expires February 18, 2012 [Page 21] Internet-Draft RADIUS-PMIPv6 August 2011 0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Type | Length | Home DHCPv4 server address +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Home DHCPv4 server address | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Type: PMIP6-Home-DHCP4-Server-Address to be defined by IANA. Length: = 6 octets. Home DHCPv4 server address: This field is of type Address and contains a 4-octet IPv4 address of the DHCP server. 4.15. PMIP6-Visited-DHCP4-Server-Address When both MAG and the LMA are in the visited network, the VAAA uses PMIP6-Visited-DHCP4-Server-Address attribute (AVP Code TBD) to deliver the IPv4 address of the DHCPv4 server from the visited network to the MAG. The VAAA MAY assign a DHCPv4 server to the MAG in deployments where the MAG acts as a DHCP Relay, as defined in [RFC5844]. 0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Type | Length | Visited DHCPv4 server address +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Visited DHCPv4 server address | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Type: PMIP6-Visited-DHCP4-Server-Address to be defined by IANA. Length: = 6 octets Visited DHCPv4 server address: This field is of type Address and contains a 4-octet IPv4 address of the DHCPv4 server Xia, et al. Expires February 18, 2012 [Page 22] Internet-Draft RADIUS-PMIPv6 August 2011 4.16. PMIP6-Home-DHCP6-Server-Address The PMIP6-Home-DHCP6-Server-Address (AVP Code TBD) contains the IPv6 address of the DHCPv6 server in the home network indicated by HAAA to the MAG that serves the concerning MN. The HAAA MAY assign a DHCPv6 server to the MAG in deployments where the MAG acts as a DHCP Relay, as defined in [RFC5213]. 0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Type | Length | Home DHCPv6 server address +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ . . . Home DHCPv6 server address . . . . +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ . | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Type: PMIP6-Home-DHCP6-Server-Address to be defined by IANA. Length: = 18 octets Home DHCPv6 server address: This field is of type Address and contains 16-octet IPv6 address of the DHCPv6 server. 4.17. PMIP6-Visited-DHCP6-Server-Address When both MAG and the LMA are located in the visited network, the PMIP6-Visited-DHCP6-Server-Address attribute (AVP Code TBD) is used to deliver the IPv6 address of the DHCPv6 server from the visited network to the MAG that serves the MN. The VAAA MAY assign a DHCPv6 server to the MAG in deployments where the MAG acts as a DHCP Relay, as defined in [RFC5213]. Xia, et al. Expires February 18, 2012 [Page 23] Internet-Draft RADIUS-PMIPv6 August 2011 0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Type | Length | Visited DHCPv6 server address +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ . . . Visited DHCPv6 server address . . . . +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ . | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Type: PMIP6-Visited-DHCP6-Server-Address to be defined by IANA. Length: = 18 octets Visited DHCPv6 server address: This field is of type Address and contains the 16-octet IPv6 address of the DHCPv6 server. 4.18. Calling-Station-Id The Calling-Station-Id AVP (AVP Code 31) is of type String and when used for PMIPv6 it contains a link-layer identifier of the MN as defined in [RFC5213], Sections 2.2 and 8.6. 4.19. Chargeable-User-Identity The Chargeable-User-Identity attribute or CUI (AVP Code 89) is an unique temporary handle used as means to, for example, correlate authentication, accounting and bill post-processing for a particular chargeable subscriber. The CUI format and use follows guidelines defined by [RFC4372]. In scope of this document, the CUI attribute MAY be present in the Access-Request. The CUI MAY also be present in the Access-Accept. The CUI Identity MUST be present in the Access-Accept if it was present in the Access-Request. If the use of the Chargeable User Identity is supported, then the MAG and/or the LMA commits to include the Chargeable User Identity in all subsequent RADIUS Accounting packets they send for the given user. Xia, et al. Expires February 18, 2012 [Page 24] Internet-Draft RADIUS-PMIPv6 August 2011 5. MAG to RADIUS AAA interface 5.1. Interface operations The MAG to the AAA RADIUS server interface is used for retrieval of the Policy Profile when a MN tries to attach, authenticate and authorize to a PMIPv6 domain. Depending on the policies and network capabilities the MAG may retrieve different sets of PMIPv6-session related parameters: o Configuration attributes for Home- or Visited Network access scenario, depending on the location and attachment point of the MN, o The IPv6 or IPv4 address of the designated LMA, depending on the access network's actual IP topology, o The IPv6 or IPv4 configuration parameters for the MN, depending on the utilized IP configuration method and individual MN's service Policy, o The DHCP Relay support attributes (IPv4 or IPv6) in case such functionality is supported in the network. In addition to PMIPv6-specific attributes, other RADIUS attributes are to be used on the MAG-to-AAA interface: The User-Name attribute (1) MUST be present in the Access-Request. It SHOULD carry the valid MN identity (PMIPv6 MN Identifier) in the form of a Network Access Identifier (NAI) [RFC4282], if such identity can be obtained. The NAS-IP-Address (4) or NAS-IPv6-Address (95) or the NAS-Identifier (32) MUST be present in the Access-Request. The Service-Type (6) and the NAS-Port-Type (69) SHOULD be present in the Access-Request. 5.2. Table of Attributes The following table provides a guide to attributes that may be found in authentication and authorization RADIUS messages between MAG and the AAA Server. Xia, et al. Expires February 18, 2012 [Page 25] Internet-Draft RADIUS-PMIPv6 August 2011 Request Accept Reject Challenge # Attribute 1 0-1 0 0 1 User-Name 0-1 0-1 0 0 4 NAS-IP-Address 0-1 0-1 0 0 5 NAS-Port 1 0-1 0 0 6 Service-Type 0-1 0-1 0 0-1 24 State 0 0-1 0 0 25 Class 0 0-1 0 0-1 27 Session-Timeout 0-1 0 0 0 31 Calling-Station-Id 1 0 0 0 32 NAS-Identifier 0-1 0-1 0 0 33 Proxy-State 1 0 0 0 69 NAS-Port-Type 1 1 1 1 80 Message-Authenticator 0-1 0-1 0 0 89 Chargeable-User-Identity 0-1 0-1 0 0 95 NAS-IPv6-Address 0-1 0-1 0 0 124 MIP6-Feature-Vector 0-1 0-1 0 0 TBD Service-Selection 0 1 0 0 TBD Mobile-Node-Identifier 0 0-1 0 0 TBD PMIP6-Home-LMA-IPv6-Address 0-1 0-1 0 0 TBD PMIP6-Visited-LMA-IPv6-Address 0 0-1 0 0 TBD PMIP6-Home-LMA-IPv4-Address 0-1 0-1 0 0 TBD PMIP6-Visited-LMA-IPv4-Address 0 0-1 0 0 TBD PMIP6-Home-HN-Prefix 0 0-1 0 0 TBD PMIP6-Visited-HN-Prefix 0 0-1 0 0 TBD PMIP6-Home-Interface-ID 0 0-1 0 0 TBD PMIP6-Visited-Interface-ID 0 0-1 0 0 TBD PMIP6-Home-IPv4-HoA 0 0-1 0 0 TBD PMIP6-Visited-IPv4-HoA 0 0-1 0 0 TBD PMIP6-Home-DHCP4-Server-Address 0-1 0-1 0 0 TBD PMIP6-Visited-DHCP4-Server-Address 0 0-1 0 0 TBD PMIP6-Home-DHCP6-Server-Address 0-1 0-1 0 0 TBD PMIP6-Visited-DHCP6-Server-Address Xia, et al. Expires February 18, 2012 [Page 26] Internet-Draft RADIUS-PMIPv6 August 2011 6. LMA to RADIUS AAA interface 6.1. Interface operations The LMA-to-HAAA interface is used for multiple operations. These operation include, but are not limited to, the authorization of the incoming PBU, updating the LMA address at the HAAA, accounting, and PMIPv6 session management. 6.2. Table of Attributes The following table provides a guide to which attributes may be found in authentication and authorization process between LMA and the AAA. 1 0-1 0 0 1 User-Name 0-1 0-1 0 0 4 NAS-IP-Address 0-1 0-1 0 0 5 NAS-Port 1 0-1 0 0 6 Service-Type 0 0-1 0 0 25 Class 0 0-1 0 0-1 27 Session-Timeout 0-1 0 0 0 31 Calling-Station-Id 1 0 0 0 32 NAS-Identifier 1 0 0 0 69 NAS-Port-Type 1 1 1 1 80 Message-Authenticator 0-1 0-1 0 0 89 Chargeable-User-Identity 0-1 0-1 0 0 95 NAS-IPv6-Address 0-1 0-1 0 0 124 MIP6-Feature-Vector 0-1 0-1 0 0 TBD Service-Selection 1 0 0 0 TBD Mobile-Node-Identifier 0-1 0-1 0 0 TBD PMIP6-Home-HN-Prefix 0 0-1 0 0 TBD PMIP6-Visited-HN-Prefix 0-1 0-1 0 0 TBD PMIP6-Home-IPv4-HoA 0 0-1 0 0 TBD PMIP6-Visited-IPv4-HoA 0 0-1 0 0 TBD PMIP6-Home-Interface-ID 0 0-1 0 0 TBD PMIP6-Visited-Interface-ID Xia, et al. Expires February 18, 2012 [Page 27] Internet-Draft RADIUS-PMIPv6 August 2011 7. Accounting 7.1. Accounting at LMA The accounting at the LMA to AAA server interface is based on [RFC2865] and [RFC2866]. This interface must support the transfer of accounting records needed for service control and charging. These records should include (but may not be limited to): time of binding cache entry creation and deletion, number of the octets sent and received by the MN over the bi-directional tunnel, etc. 7.2. Accounting at MAG The accounting at the MAG to AAA server interface is based on [RFC2865] and [RFC2866]. The interface must also support the transfer of accounting records which should include: time of binding cache entry creation and deletion, number of the octets sent and received by the MN over the bi-directional tunnel, etc. If there is data traffic between a visiting MN and a correspondent node that is locally attached to an access link connected to the same MAG, the mobile access gateway MAY optimize on the delivery efforts by locally routing the packets instead of using reverse tunneling to the mobile node's LMA. In this case, the local data traffic too MUST be reported to AAA Accounting servers by means of RADIUS protocol. 7.3. Table of Attributes The following table provides a list of attributes that may be included in the RADIUS Accounting messages. These attributes are to complement the set of accounting attributes already required by [RFC2866] and [RFC2869]. Request Interim Stop Attribute 0-1 0 0-1 PMIP6-Home-LMA-IPv6-Address 0-1 0 0-1 PMIP6-Visited-LMA-IPv6-Address 0-1 0 0-1 PMIP6-Home-LMA-IPv4-Address 0-1 0 0-1 PMIP6-Visited-LMA-IPv4-Address 0-1 0 0-1 PMIP6-Home-HN-Prefix 0-1 0 0-1 PMIP6-Visited-HN-Prefix 0-1 0 0-1 PMIP6-Home-IPv4-HoA 0-1 0 0-1 PMIP6-Visited-IPv4-HoA 0-1 0 0-1 Service-Selection 0-1 0 0-1 MIP6-Feature-Vector 0-1 0-1 0-1 Mobile-Node-Identifier 0-1 0 0-1 Calling-Station-Id Xia, et al. Expires February 18, 2012 [Page 28] Internet-Draft RADIUS-PMIPv6 August 2011 0-1 0-1 0-1 Chargeable-User-Identity Xia, et al. Expires February 18, 2012 [Page 29] Internet-Draft RADIUS-PMIPv6 August 2011 8. Security Considerations The RADIUS messages may be transported between the MAG and/or the LMA to the RADIUS server via one or more AAA brokers or RADIUS proxies. In this case the LMA to the RADIUS AAA server communication relies on the security properties of the intermediate AAA brokers and RADIUS proxies. 9. IANA consideration 9.1. Attribute Type Codes This specification defines the following new RADIUS attribute type codes: Mobile-Node-Identifier Service-Selection PMIP6-Home-LMA-IPv6-Address PMIP6-Visited-LMA-IPv6-Address PMIP6-Home-LMA-IPv4-Address PMIP6-Visited-LMA-IPv4-Address PMIP6-Home-HN-Prefix PMIP6-Visited-HN-Prefix PMIP6-Home-Interface-ID PMIP6-Visited-Interface-ID PMIP6-Home-IPv4-HoA PMIP6-Visited-IPv4-HoA PMIP6-Home-DHCP4-Server-Address PMIP6-Visited-DHCP4-Server-Address PMIP6-Home-DHCP6-Server-Address PMIP6-Visited-DHCP6-Server-Address 9.2. Namespaces This specification defines new values to the Mobility Capability registry (see [RFC5447]) for use with the MIP6- Feature-Vector AVP: Token | Value ----------------------------------+-------------------- IP4_TRANSPORT_SUPPORTED | 0x0000080000000000 IP4_HOA_ONLY_SUPPORTED | 0x0000100000000000 Xia, et al. Expires February 18, 2012 [Page 30] Internet-Draft RADIUS-PMIPv6 August 2011 10. Acknowledgements First of all, the authors would like to acknowledge the standardization work and people of the WiMAX Forum that have set the foundation for this document. The authors would like to thank Basavaraj Patil, Glen Zorn, Avi Lior, Alan DeKok and Pete McCann for reviewing the document and providing valuable input. The authors would also like to thank the authors of [RFC5779] as this document re-uses some procedural ideas of the aforementioned specification. Xia, et al. Expires February 18, 2012 [Page 31] Internet-Draft RADIUS-PMIPv6 August 2011 11. References 11.1. Normative References [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, March 1997. [RFC2865] Rigney, C., Willens, S., Rubens, A., and W. Simpson, "Remote Authentication Dial In User Service (RADIUS)", RFC 2865, June 2000. [RFC5213] Gundavelli, S., Leung, K., Devarapalli, V., Chowdhury, K., and B. Patil, "Proxy Mobile IPv6", RFC 5213, August 2008. [RFC4282] Aboba, B., Beadles, M., Arkko, J., and P. Eronen, "The Network Access Identifier", RFC 4282, December 2005. [RFC5447] Korhonen, J., Bournelle, J., Tschofenig, H., Perkins, C., and K. Chowdhury, "Diameter Mobile IPv6: Support for Network Access Server to Diameter Server Interaction", RFC 5447, February 2009. [RFC3588] Calhoun, P., Loughney, J., Guttman, E., Zorn, G., and J. Arkko, "Diameter Base Protocol", RFC 3588, September 2003. [RFC5844] Wakikawa, R. and S. Gundavelli, "IPv4 Support for Proxy Mobile IPv6", RFC 5844, May 2010. [RFC5779] Korhonen, J., Bournelle, J., Chowdhury, K., Muhanna, A., and U. Meyer, "Diameter Proxy Mobile IPv6: Mobile Access Gateway and Local Mobility Anchor Interaction with Diameter Server", RFC 5779, February 2010. [RFC4372] Adrangi, F., Lior, A., Korhonen, J., and J. Loughney, "Chargeable User Identity", RFC 4372, January 2006. 11.2. Informative references [RFC2866] Rigney, C., "RADIUS Accounting", RFC 2866, June 2000. [RFC2869] Rigney, C., Willats, W., and P. Calhoun, "RADIUS Extensions", RFC 2869, June 2000. [RFC3748] Aboba, B., Blunk, L., Vollbrecht, J., Carlson, J., and H. Levkowetz, "Extensible Authentication Protocol (EAP)", RFC 3748, June 2004. [RFC5149] Korhonen, J., Nilsson, U., and V. Devarapalli, "Service Xia, et al. Expires February 18, 2012 [Page 32] Internet-Draft RADIUS-PMIPv6 August 2011 Selection for Mobile IPv6", RFC 5149, February 2008. Authors' Addresses Frank Xia Huawei USA 1700 Alma Dr. Suite 500 Plano, TX 75075 Phone: +1 972-509-5599 Email: xiayangsong@huawei.com Behcet Sarikaya Huawei USA 1700 Alma Dr. Suite 500 Plano, TX 75075 Phone: +1 972-509-5599 Email: sarikaya@ieee.org Jouni Korhonen Nokia Siemens Networks Linnoitustie 6 Espoo FI-02600 Finland Email: jouni.nospam@gmail.com Sri Gundavelli Cisco 170 West Tasman Drive San Jose, CA 95134 Email: sgundave@cisco.com Damjan Damic Siemens Heinzelova 70a Zagreb 10000 Croatia Email: damjan.damic@siemens.com Xia, et al. 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