UDP Surplus Header
draft-herbert-udp-space-hdr-01

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INTERNET-DRAFT                                                T. Herbert
Intended Status: Standard                                          Intel
Expires: January 2020                                                   
                                                                        
                                                            July 8, 2019

                           UDP Surplus Header
                     draft-herbert-udp-space-hdr-01

Abstract

   This specification defines the UDP Surplus Header that is an
   extensible and generic format applied to the UDP surplus space. The
   UDP surplus space comprises the bytes between the end of the UDP
   datagram, as indicated by the UDP Length field, and the end of the IP
   packet, as indicated by IP packet or payload length. The UDP Surplus
   Header can be either a protocol trailer of the UDP datagram, or a
   protocol header which effectively serves as an extended UDP header.

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 and License Notice

   Copyright (c) 2019 IETF Trust and the persons identified as the
   document authors. All rights reserved.

 

T. Herbert              Expires January 9, 2020                 [Page 1]
INTERNET DRAFT        draft-herbert-udp-opt-hdr-01          July 8, 2019

   This document is subject to BCP 78 and the IETF Trust's Legal
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Table of Contents

   1  Introduction  . . . . . . . . . . . . . . . . . . . . . . . . .  3
   2  UDP Surplus Header format . . . . . . . . . . . . . . . . . . .  3
     2.1 Protocol trailer format  . . . . . . . . . . . . . . . . . .  4
     2.2 Protocol header format (Extended UDP header) . . . . . . . .  6
   3  Operation . . . . . . . . . . . . . . . . . . . . . . . . . . .  7
     3.1 Sender operation . . . . . . . . . . . . . . . . . . . . . .  7
     3.2 Receiver operation . . . . . . . . . . . . . . . . . . . . .  8
       3.2.1 Error handling . . . . . . . . . . . . . . . . . . . . .  9
   4  Motivation  . . . . . . . . . . . . . . . . . . . . . . . . . .  9
   5  Security Considerations . . . . . . . . . . . . . . . . . . . . 11
   6  IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 11
   7  References  . . . . . . . . . . . . . . . . . . . . . . . . . . 11
     7.1  Normative References  . . . . . . . . . . . . . . . . . . . 11
     7.2  Informative References  . . . . . . . . . . . . . . . . . . 11
   Appendix A: Checksum processing  . . . . . . . . . . . . . . . . . 12
     A.1 Transmit Checksum processing . . . . . . . . . . . . . . . . 12
       A.1.1 TX checksum for USH trailer  . . . . . . . . . . . . . . 12
       A.1.2 TX checksum for USH header . . . . . . . . . . . . . . . 13
     A.2 Receive Checksum handling  . . . . . . . . . . . . . . . . . 13
       A.2.1 Simultaneous verification  . . . . . . . . . . . . . . . 13
       A.2.2 RX checksum for USH trailer  . . . . . . . . . . . . . . 14
       A.2.3 RX checksum for USH header . . . . . . . . . . . . . . . 14
   Appendix B: Protocol headers versus versus protocol trailers . . . 15
   Appendix C: Protocol field alignment . . . . . . . . . . . . . . . 15
   Author's Address . . . . . . . . . . . . . . . . . . . . . . . . . 16

 

T. Herbert              Expires January 9, 2020                 [Page 2]
INTERNET DRAFT        draft-herbert-udp-opt-hdr-01          July 8, 2019

1  Introduction

   As defined in [RFC768], the UDP header contains a UDP Length field.
   The UDP Length is not required to correlate with the IP payload
   length of a packet such that there may be bytes between the end of
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