Using the Encapsulating Security Payload (ESP) Transport Format with the Host Identity Protocol (HIP)
RFC 7402

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Internet Engineering Task Force (IETF)                         P. Jokela
Request for Comments: 7402                  Ericsson Research NomadicLab
Obsoletes: 5202                                             R. Moskowitz
Category: Standards Track                                 HTT Consulting
ISSN: 2070-1721                                                 J. Melen
                                            Ericsson Research NomadicLab
                                                              April 2015

    Using the Encapsulating Security Payload (ESP) Transport Format
                 with the Host Identity Protocol (HIP)

Abstract

   This memo specifies an Encapsulating Security Payload (ESP) based
   mechanism for transmission of user data packets, to be used with the
   Host Identity Protocol (HIP).  This document obsoletes RFC 5202.

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Further information on
   Internet Standards is available in Section 2 of RFC 5741.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   http://www.rfc-editor.org/info/rfc7402.

Copyright Notice

   Copyright (c) 2015 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
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   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.

Jokela, et al.               Standards Track                    [Page 1]
RFC 7402         Using the ESP Transport Format with HIP      April 2015

Table of Contents

   1. Introduction ....................................................3
   2. Conventions Used in This Document ...............................4
   3. Using ESP with HIP ..............................................4
      3.1. ESP Packet Format ..........................................5
      3.2. Conceptual ESP Packet Processing ...........................5
           3.2.1. Semantics of the Security Parameter Index (SPI) .....6
      3.3. Security Association Establishment and Maintenance .........6
           3.3.1. ESP Security Associations ...........................6
           3.3.2. Rekeying ............................................7
           3.3.3. Security Association Management .....................8
           3.3.4. Security Parameter Index (SPI) ......................8
           3.3.5. Supported Ciphers ...................................8
           3.3.6. Sequence Number .....................................9
           3.3.7. Lifetimes and Timers ................................9
      3.4. IPsec and HIP ESP Implementation Considerations ............9
           3.4.1. Data Packet Processing Considerations ..............10
           3.4.2. HIP Signaling Packet Considerations ................10
   4. The Protocol ...................................................11
      4.1. ESP in HIP ................................................11
           4.1.1. IPsec ESP Transport Format Type ....................11
           4.1.2. Setting Up an ESP Security Association .............11
           4.1.3. Updating an Existing ESP SA ........................12
   5. Parameter and Packet Formats ...................................13
      5.1. New Parameters ............................................13
           5.1.1. ESP_INFO ...........................................13
           5.1.2. ESP_TRANSFORM ......................................15
           5.1.3. NOTIFICATION Parameter .............................16
      5.2. HIP ESP Security Association Setup ........................17
           5.2.1. Setup during Base Exchange .........................17
      5.3. HIP ESP Rekeying ..........................................18
           5.3.1. Initializing Rekeying ..............................19
           5.3.2. Responding to the Rekeying Initialization ..........19
      5.4. ICMP Messages .............................................20
           5.4.1. Unknown SPI ........................................20
   6. Packet Processing ..............................................20
      6.1. Processing Outgoing Application Data ......................20
      6.2. Processing Incoming Application Data ......................21