Geneve Header Encryption Option (GEO)
draft-mglt-nvo3-geneve-encryption-option-00

Abstract

This document describes the Geneve Encryption Option (GEO). This option enables a Geneve forwarding element to encrypt the Geneve Header with selected associated Geneve Options as well as a portion of the Geneve Payload.

Status of This Memo

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Table of Contents

• 1. Requirements notation
• 2. Introduction
• 3. GEO Description
• 4. GEO Processing
• 4.1. GEO Placement
• 5. IANA Considerations
• 6. Security Considerations
• 7. Acknowledgment
• 8. References
• 8.1. Normative References
• 8.2. Informative References
• Author's Address

1. Requirements notation

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].

2. Introduction

3. GEO Description

For generic format of the Geneve Options is defined in Figure 1. The following values are expected:

• Option Class: 0x0000
• Type: C is unset as the GEO can simply be ignored by a NVE or a transit node. The GSP will prevent to accept a GOA that is mandated by the GSP and that has not been validated.
• R is set to 0.
• Length: This document only considers the algorithms recommended by [I-D.ietf-ipsecme-rfc7321bis] ENCR_AES_GCM_16 or ENCR_CHACHA20_POLY1305. These algorithms are defined in [RFC4106] and [RFC7539].

 
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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 
|          Option Class         |      Type     |R|R|R| Length  |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 
|                      Variable Option Data                     |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

Figure 1: Geneve Option Format

 
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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 
|                      Sequence Number                          |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 
|           GEO-ID            |        Covered Length           |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 
|                                                               | 
|                       ICV  128/256 bits 16                    | 
|                                                               |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

Figure 2: Geneve Encryption Data

4. GEO Processing

4.1. GEO Placement

[ 

Geneve Encryption Option      -----+           
                                   |     
                                   |           Covered Length
 <------------------->             v       <-------------------->
+---------------------+-------------+-----+------------+----------------+ 
| Geneve Fixed Header | Geneve Opt. | GEO | Geneve Opt.| Geneve Payload |
+---------------------+-------------+-----+------------+----------------+
 <--------+----------> <---------+-------> <----------+---------> <-+-->
          |                      |          xxxx encrypted xxxxx
          |                      |                    |             |
          +-------------------------------------------+             | 
       Fields covered            |                                  | 
       by the encryption         +----------------------------------+  
                                    Fields not covered
                                    by the encryption

Figure 3: Geneve Encryption Options Placement

GEO is a termination Geneve Option. The encrypted Geneve Options and portion of the encrypted Geneve Payload are appended to the Geneve Header. They are not encoded as an Geneve Option.

5. IANA Considerations

There are no IANA consideration for this document.

6. Security Considerations

7. Acknowledgment

8. References

8.1. Normative References

8.2. Informative References

Author's Address