UDP Surplus Space Header
draft-herbert-udp-space-hdr-00

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INTERNET-DRAFT                                                T. Herbert
Intended Status: Standard                                     Quantonium
Expires: September 2019                                                 
                                                                        
                                                          March 11, 2019

                        UDP Surplus Space Header
                     draft-herbert-udp-space-hdr-00

Abstract

   This draft defines a header for surplus space in UDP. The UDP surplus
   space is bytes between the end of the UDP payload and the end of the
   IP packet. The purpose of the header is to disambiguate uses of the
   surplus space. The UDP surplus space header includes a type, length,
   and checksum field that covers the space.

Status of this Memo

   This Internet-Draft is submitted to IETF in full conformance with the
   provisions of BCP 78 and BCP 79.

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   Copyright (c) 2019 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
 

T. Herbert             Expires September 12, 2019               [Page 1]
INTERNET DRAFT        draft-herbert-udp-opt-hdr-00        March 11, 2019

   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document. Please review these documents
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Table of Contents

   1  Introduction  . . . . . . . . . . . . . . . . . . . . . . . . .  3
   2  UDP surplus space header format . . . . . . . . . . . . . . . .  3
   3  Operation . . . . . . . . . . . . . . . . . . . . . . . . . . .  4
     3.1 Sender operation . . . . . . . . . . . . . . . . . . . . . .  4
     3.2 Receiver operation . . . . . . . . . . . . . . . . . . . . .  6
   4  Security Considerations . . . . . . . . . . . . . . . . . . . .  7
   5  IANA Considerations . . . . . . . . . . . . . . . . . . . . . .  7
   6  References  . . . . . . . . . . . . . . . . . . . . . . . . . .  7
     6.1  Normative References  . . . . . . . . . . . . . . . . . . .  7
     6.2  Informative References  . . . . . . . . . . . . . . . . . .  7
   Author's Address . . . . . . . . . . . . . . . . . . . . . . . . .  7

 

T. Herbert             Expires September 12, 2019               [Page 2]
INTERNET DRAFT        draft-herbert-udp-opt-hdr-00        March 11, 2019

1  Introduction

   This specification defines a UDP surplus header to provide an
   extensible and generic format of the UDP surplus space. The UDP
   surplus space is bytes between the end of the UDP payload and the end
   of the IP packet. The UDP surplus space is possible since UDP
   contains its own length field for the UDP datagram that is not
   required to coincide with the end of the IP packet.

   The UDP surplus space header includes a type, length, and checksum
   field that covers the space. UDP options [UDPOPT] are being defined
   as the first standard use of the UDP surplus space. This draft
   permits other uses, including private uses of the space.

2  UDP surplus space header format

   The format of the UDP surplus space header is shown below.

     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
                    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
                    |           Padding (0 to 3 bytes)              |
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    |    Type       |   Length      |         Checksum              |
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    |                                                               |
    ~                      Type Specific Data                       ~
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