MIF WG P. Seite Internet-Draft France Telecom - Orange Intended status: Informational JC. Zuniga Expires: August 23, 2013 InterDigital Communications, LLC February 19, 2013 MIF API for Connection Management draft-seite-mif-cm-01.txt Abstract There is currently a need to present a coherent connection management behaviour for different terminal platforms (e.g. mobile phones, PCs, tablets, etc.). This document discusses how a connection manager can use the MIF API to provide this coherent behaviour and enhance the end user's experience when a terminal is able to connect to multiple interfaces. The goal of this document is not to define a connection manager specification, but to focus on the interaction with the MIF API and suggest relevant generic messages for the interface. This document is for discussion and its intention is to help clarifying the utilization of the MIF API in a connection management context and propose some relevant considerations. 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 August 23, 2013. Copyright Notice Copyright (c) 2013 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 Seite & Zuniga Expires August 23, 2013 [Page 1] Internet-Draft MIF API for Connection Management February 2013 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. Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3 2. Architecture of a MIF terminal . . . . . . . . . . . . . . . . 4 3. Use-case . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4. Functions of the connection manager . . . . . . . . . . . . . 8 5. Security Considerations . . . . . . . . . . . . . . . . . . . 12 6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 13 7. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 14 8. References . . . . . . . . . . . . . . . . . . . . . . . . . . 15 8.1. Normative References . . . . . . . . . . . . . . . . . . . 15 8.2. Informative References . . . . . . . . . . . . . . . . . . 15 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 17 Seite & Zuniga Expires August 23, 2013 [Page 2] Internet-Draft MIF API for Connection Management February 2013 1. Introduction [I-D.ietf-mif-api-extension] describes an abstract API that provides commands and services for applications and higher layer APIs running on a terminal with more than one interface. There is currently a need to present a coherent connection management behaviour for different terminal platforms (e.g. mobile phones, PCs, tablets, etc.), as users often experience a very different behaviour when connecting with various platforms to the same networks and for the same purposes (e.g. web browsing, email access, dedicated applications, etc.). This document builds on top of the MIF API and aims to discuss how connection managers can use the MIF API to provide a coherent and constant behaviour to the users. The goal of this document is not to define a connection manager specification, but to focus on the interaction with the MIF API and suggest relevant generic messages for the interface This document is for discussion and its intention is to help clarifying the utilization of the MIF API in a connection management context. Seite & Zuniga Expires August 23, 2013 [Page 3] Internet-Draft MIF API for Connection Management February 2013 2. Architecture of a MIF terminal The terminal's MIF API based architecture is an instantiation of the MIF API model described in [I-D.ietf-mif-api-extension]; main functions and APIs are described below: o MIF API: it provides information as per [I-D.ietf-mif-api-extension]. o Connection Manager: it is an application relying on the MIF API; this application acts on behalf of other runing applications. The connection manager decides about the mapping between IP flows and interfaces, then configures the IP stack, and lower layers, accordingly, e.g. configuration of the routing table. The connection manager relies on information provided either by the MIF API or the OS API. Only interface with the MIF API is in the scope of this document. o OS API: Provides the interface to manipulate IP object configuration, e.g. routing table. +------------------------------+ +------------------------------+ | Connection manager | | Application | +------------------------------+ +------------------------------+ /\ || /\ || /\ || || || || || || \/ || || || \/ || || +------------------------+ +-------------------+ || || | MIF API | |Communications API | || || +------------------------+ +-------------------+ || || /\ || /\ || || \/ || || || || +--------------------+ || \/ || \/ +| OS API (Kernel) |-----------------------------------------+ |+--------------------+ Network Link API | +---------------------------------------------------------------+ /\ || /\ || || \/ || \/ +-------------------+ +--------------------+ | Network Interface | | Network Interface | | 1 | | 2 | +-------------------+ +--------------------+ Figure 1: MIF API framework Seite & Zuniga Expires August 23, 2013 [Page 4] Internet-Draft MIF API for Connection Management February 2013 3. Use-case The presented use-case aims to illustrate the behaviour of the MIF API in a concrete situation. The use-case is as follows: 1. Multiple IP communications are running simultaneously; each can be mapped to different interface/provisioning domain at the same time. 2. The connection manager selects the appropriate interface for the application. The connection manager makes a decision according to various criteria; including information provided by the MIF and lower layers APIs, user preferences, and so on. 3. The connection manager, together with the terminal's APIs, shall make the applications agnostic about the multiple interfaces management. The interaction between the different APIs is depicted in Figure 2. It is assumed that at least one IP communication is running. Then, an interface event occurs and the connection manager decides to move the communication to a different interface. Seite & Zuniga Expires August 23, 2013 [Page 5] Internet-Draft MIF API for Connection Management February 2013 Connection Manager MIF API Network Link API OS API | | | | |announce.subscribe | | (1) |------------------>| | | | | subcribe.request | | | |------------------->| | | | subcribe.confirm | | | subscr.confirm |<-------------------| | |<------------------| | | | | | | (2) | | event occurs | | event.announce | event.notif | | (3) |<----------------- |<------------------ | | | | | | | config.get[PID] | | | (4) |------------------>|------------------->| | | config.resp | | | |<----------------- |<-------------------| | | | config-object.get | | (5?) |---------------------------------------------------->| | | config-object.resp | | |<----------------------------------------------------| (6) decision made | | | | | request.config | | (7) |---------------------------------------------------->| | | config.resp | | |<----------------------------------------------------| | request.config | | | or |------------------>| | | | |------------------->| | (8) | |<------------------ | | | |-------------------------------->| both | config.resp |<--------------------------------| 7 and 8?|<----------------- | | | | | Figure 2: APIs interaction Operations are as follows: 1. The connection manager subscribes to the MIF API notifications [I-D.ietf-mif-api-extension]. 2. An event, to which the connection manager has subscribed, occurs; e.g. a new interface becomes available or a low radio signal Seite & Zuniga Expires August 23, 2013 [Page 6] Internet-Draft MIF API for Connection Management February 2013 level is crossed. 3. The connection manager is notified about the event. 4. In order to take its decision, the connection manager gets some configuration information from the MIF API. 5. The connection manager fetches additional information from the OS API 6. The connection manager decides to move the ongoing IP communication to another interface. 7. The connection manager requests the OS API to reconfigure one or multiple interfaces according to the decision; for example, the connection manager could request reconfiguration of the routing table or trigger a MIP operation. Seite & Zuniga Expires August 23, 2013 [Page 7] Internet-Draft MIF API for Connection Management February 2013 4. Functions of the connection manager This section focuses on the interactions between the connection manager and the MIF API and OS API. The interactions between the connection manager and other complementary APIs, like user preferences and/or ANDSF network operator policies are out of the scope of this document. A connection manager may also rely on different abstraction layers together with the MIF API. The IEEE 802.21 MIH SAP [IEEE802.21] is an example of such an abstraction layer, which can be seen as a partial instantiation of the MIF API. A companion document [I-D.zuniga-mif-802-21-overview] adresses interaction between IEEE 802.21 and MIF API. Generic connection manager functions and their relation to the MIF API are described below. The following assumes the MIF API is the unique API for any manipulation of IP objects. However, current MIF API allows to gather information from the IP stack but not to configure it. As a consequence three functions are added to the MIF API: GetIPtype(), ConfigFlowRouting() and SetSourceAddress(). Subscribe(eventID) Description: register for a MIF API event notification, e.g. WLAN scan results ready, WLAN connected, WLAN disconnected, interface is going to be disconnected detected (e.g. because of low radio signal level detected), Cellular connected, Cellular disconnected, etc. Input: identifier of the event to be notified. Some events are defined in [I-D.ietf-mif-api-extension] API: MIF API UnSubscribe(eventID) Description: unregister to a MIF API notification. Input: identifier of event. Some events are defined in [I-D.ietf-mif-api-extension] API: MIF API ListInterfaces() Description: return the list of available interfaces with their characteristics. Interfaces may have different access Seite & Zuniga Expires August 23, 2013 [Page 8] Internet-Draft MIF API for Connection Management February 2013 technologies. Input: n/a API: MIF API ListProvisioningDomains() Description: return the list of available provisioning domains with their characteristics. Input: n/a API: MIF API GetStatus(IID) Description: provide the status of the interface, e.g. enabled/ disabled, active, idle, connection failed, connecting, disconnecting, scanning, unknown state, etc. Input:Interface Identifier API: MIF API IPconnectivityCheck(PID, IP[]) Description: check IP connectivity to the intranet/Internet: the interface may have a valid IP address but no IP connectivity to data networks (e.g. web based authentication through a captive portal). Input: Provisioning domain Identifier, IP addresses to be tested API: MIF API GetConfiguration(IID) Description: retrieve layer 2 configuration information for a given interface. Input: Interface Identifier API: OS API SetConfiguration(IID) Seite & Zuniga Expires August 23, 2013 [Page 9] Internet-Draft MIF API for Connection Management February 2013 Description: configures an interface, e.g. enable/disable, scan, etc. Input: Interface Identifier API: OS API GetConfiguration(PID) Description: retrieve configuration information for a given provisioning domain(IP address(es), DNS, default gateway, authentication method, associated interface(s)) Input: Provisioning domain Identifier API: MIF API SetConfiguration(PID) Description: configure provisioning domain information (IP addresse(s), default gateway, authentication method, associated interface, routing table, etc.) Input: Provisioning domain Identifier API: MIF API GetTheoriticalQoS(IID) Description: provide information on the theoretical interface capabilities (e.g. upload/download speed) Input: Interface Identifier API: MIF API GetAvailableQoS(IID) Description: provide information on the quality of communication (Jitter, delay, average upload data rate, average Download data rate, signal strength, etc.) Input: Interface Identifier API: MIF API GetIPtype(IP address) Seite & Zuniga Expires August 23, 2013 [Page 10] Internet-Draft MIF API for Connection Management February 2013 Description: return the type of address and properties (e.g. local, remote, mobile IP anchored, etc.). This function is to be added to the MIF API as per [I-D.ietf-mif-api-extension]. [I-D.korhonen-dmm-prefix-properties]. Input: IP address API: updated MIF API ConfigFlowRouting(ROUTE, FlowID) Description: associate a route, ROUTE, to the IP flow identified by FlowID, e.g. as defined in [RFC6088]. This function is to be added to the MIF API as per [I-D.ietf-mif-api-extension]. Input: routing table identifier, flow identifier API: updated MIF API SetSourceAddress(IP, FlowID) Description: influence source address selection for a given IP flow. This function is to be added to the MIF API as per [I-D.ietf-mif-api-extension]. Input: IP source address, flow identifier API: updated MIF API Seite & Zuniga Expires August 23, 2013 [Page 11] Internet-Draft MIF API for Connection Management February 2013 5. Security Considerations TBD. Seite & Zuniga Expires August 23, 2013 [Page 12] Internet-Draft MIF API for Connection Management February 2013 6. IANA Considerations This document has no actions for IANA. Seite & Zuniga Expires August 23, 2013 [Page 13] Internet-Draft MIF API for Connection Management February 2013 7. Acknowledgements The authors would like to express their gratitude to Ralph Droms, Ted Lemon and Dave Thaler for the fruitful discussions regarding MIF API and connection managers. Seite & Zuniga Expires August 23, 2013 [Page 14] Internet-Draft MIF API for Connection Management February 2013 8. References 8.1. Normative References [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, March 1997. [RFC6088] Tsirtsis, G., Giarreta, G., Soliman, H., and N. Montavont, "Traffic Selectors for Flow Bindings", RFC 6088, January 2011. [RFC6089] Tsirtsis, G., Soliman, H., Montavont, N., Giaretta, G., and K. Kuladinithi, "Flow Bindings in Mobile IPv6 and Network Mobility (NEMO) Basic Support", RFC 6089, January 2011. 8.2. Informative References [I-D.deng-mif-api-session-continuity-guide] Deng, H., Krishnan, S., Lemon, T., and M. Wasserman, "Guide for application developers on session continuity by using MIF API", draft-deng-mif-api-session-continuity-guide-03 (work in progress), October 2012. [I-D.ietf-mif-api-extension] Liu, D., Lemon, T., and Z. Cao, "MIF API consideration", draft-ietf-mif-api-extension-03 (work in progress), November 2012. [I-D.ietf-netext-logical-interface-support] Melia, T. and S. Gundavelli, "Logical Interface Support for multi-mode IP Hosts", draft-ietf-netext-logical-interface-support-06 (work in progress), October 2012. [I-D.korhonen-dmm-prefix-properties] Korhonen, J., Patil, B., Gundavelli, S., Seite, P., and D. Liu, "IPv6 Prefix Mobility Management Properties", draft-korhonen-dmm-prefix-properties-03 (work in progress), October 2012. [I-D.zuniga-mif-802-21-overview] Zuniga, J. and P. Seite, "IEEE 802.21 Overview", draft-zuniga-mif-802-21-overview-00 (work in progress), February 2013. [IEEE802.21] Seite & Zuniga Expires August 23, 2013 [Page 15] Internet-Draft MIF API for Connection Management February 2013 IEEE, "IEEE Standard for Local and Metropolitan Area Networks - Part 21: Media Independent Handover Services", IEEE LAN/MAN Std 802.21-2008, January 2009.", 2009, < http ://www.ieee802.org/21/private/Published%20Spec/ 802.21-2008.pdf>. Seite & Zuniga Expires August 23, 2013 [Page 16] Internet-Draft MIF API for Connection Management February 2013 Authors' Addresses Pierrick Seite France Telecom - Orange 4, rue du Clos Courtel, BP 91226 Cesson-Sevigne 35512 France Email: pierrick.seite@orange.com Juan Carlos Zuniga InterDigital Communications, LLC 1000 Sherbrooke Street West, 10th floor Montreal, Quebec H3A 3G4 Canada Email: JuanCarlos.Zuniga@InterDigital.com Seite & Zuniga Expires August 23, 2013 [Page 17]