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Internet Engineering Task Force                            J. Lemon, Ed.
Internet-Draft                                                  Broadcom
Intended status: Informational                                  F. Maino
Expires: September 3, 2018                                      M. Smith
                                                                   Cisco
                                                           March 2, 2018


                  Group Policy Encoding with VXLAN-GPE
                      draft-lemon-vxlan-gpe-gbp-02

Abstract

   This document defines a header companion for the Generic Protocol
   Extension for Virtual eXtensible Local Area Network (VXLAN-GPE) that
   is used to carry a Group Policy Identifier for the purposes of policy
   enforcement.

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 https://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 September 3, 2018.

Copyright Notice

   Copyright (c) 2018 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
   (https://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




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   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Conventions . . . . . . . . . . . . . . . . . . . . . . .   2
     1.2.  Abbreviations used in this document . . . . . . . . . . .   2
   2.  Group Based Policy Sub-header . . . . . . . . . . . . . . . .   2
     2.1.  Header Format . . . . . . . . . . . . . . . . . . . . . .   2
   3.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   4
   4.  Security Considerations . . . . . . . . . . . . . . . . . . .   4
   5.  Normative References  . . . . . . . . . . . . . . . . . . . .   4
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   5

1.  Introduction

   This document defines the group-based policy (GBP) sub-header for
   VXLAN-GPE [I-D.ietf-nvo3-vxlan-gpe].  The GBP sub-header carries a
   16-bit group policy ID that is semantically equivalent to the 16-bit
   group policy ID defined in [I-D.smith-vxlan-group-policy].

1.1.  Conventions

   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 RFC 2119 [RFC2119].

1.2.  Abbreviations used in this document

   GBP:       Group-Based Policy

   VXLAN-GPE: Virtual eXtensible Local Area Network, Generic Protocol
              Extension [I-D.ietf-nvo3-vxlan-gpe]

2.  Group Based Policy Sub-header

   The Group-Based Policy (GBP) Sub-header follows the VXLAN-GPE header,
   or another VXLAN-GPE subheader.

2.1.  Header Format

   The format of the GBP sub-header is as shown below:








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       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
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |      Group Policy ID          | Res |E|A|D|Ver| Next Protocol |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+


   o  Group Policy ID: 16 bit identifier that indicates the Group Policy
      ID being encapsulated by this GBP sub-header.  The allocation of
      Group Policy ID values is outside the scope of this document.

   o  Reserved (Res): the 3 bit field MUST be set to zero on
      transmission and ignored on receipt.

   o  End Destination bit (E bit): The E bit is set to 0 to represent
      the Group Policy ID associated with the source of the packet.  The
      E bit is set to 1 to represent the Group Policy ID associated with
      the end destination of the packet.  Note that if the packet
      carryies a destination group sub-header, it MUST also carry a
      source group sub-header.

   o  Policy Applied bit (A bit): The A bit is set to 0 to indicate that
      the group policy has not (yet) been applied to this packet.  Group
      policies MUST be applied by devices when the A bit is set to 0 and
      the destination Group has been determined.  Devices that apply the
      group policy MUST set the A bit to 1 after the policy has been
      applied.  The A bit is set to 1 to indicate that the group policy
      has already been applied to this packet.  Policies that redirect
      the packet MUST NOT be applied by devices when the A bit is set.
      Policies that cause the packet to be dropped MAY be applied.

   o  Don't Learn bit (D bit): The D bit is set to 1 to indicate that
      the egress VTEP MUST NOT learn the source address of the
      encapsulated frame.

   o  Version (Ver): indicates the Version of the Group Policy VXLAN-GPE
      sub-header.  The initial version is 0.

   o  Next Protocol: This 8 bit field indicates the protocol header
      immediately following this VXLAN GPE sub-header.  Next Protocol
      types are encoded as specified in [I-D.ietf-nvo3-vxlan-gpe].

   An example frame format is as shown below:








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    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
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                    Outer Ethernet Header                      |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                        Outer IP Header                        |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                       Outer UDP Header                        |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +
   |R|R|Ver|I|P|R|O|          Reserved             | NP = GBP      |  |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ GPE
   |     Virtual Network Identifier (VNI)          | Reserved      |  |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +
   |      Group Policy ID          | Res |E|A|D|Ver| Next Protocol | GBP
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +
   |                                                               |
   :                        Next Protocol                          :
   |                                                               |
   +---------------------------------------------------------------+


3.  IANA Considerations

   IANA is requested to add a new value to registry of "Next Protocol",
   which is defined in [I-D.ietf-nvo3-vxlan-gpe].  The new value of 6
   will signify a GBP sub-header as the next protocol.

4.  Security Considerations

   The same security considerations applied to [I-D.ietf-nvo3-vxlan-gpe]
   and to [I-D.smith-vxlan-group-policy] apply to this document.

   Additionally, the security policy value carried in the GBP header
   impacts security directly.  There is a risk that this identifier
   could be altered.  Accordingly, the network should be designed such
   that this header can be inserted only by trusted entities, and can
   not be altered before reaching the destination.  This can be
   mitigated through physical security of the network and/or by
   encryption or validation of the entire packet, including the GBP.

5.  Normative References

   [I-D.ietf-nvo3-vxlan-gpe]
              Maino, F., Kreeger, L., and U. Elzur, "Generic Protocol
              Extension for VXLAN", draft-ietf-nvo3-vxlan-gpe-05 (work
              in progress), October 2017.





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   [I-D.smith-vxlan-group-policy]
              Smith, M. and L. Kreeger, "VXLAN Group Policy Option",
              draft-smith-vxlan-group-policy-04 (work in progress),
              October 2017.

   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119,
              DOI 10.17487/RFC2119, March 1997,
              <https://www.rfc-editor.org/info/rfc2119>.

Authors' Addresses

   John Lemon (editor)
   Broadcom Limited
   270 Innovation Drive
   San Jose, CA  95134
   USA

   Email: john.lemon@broadcom.com


   Fabio Maino
   Cisco Systems

   Email: fmaino@cisco.com


   Michael Smith
   Cisco Systems

   Email: michsmit@cisco.com




















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