Generic TCP Encapsulation
draft-herbert-tsvwg-gte-00

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Internet-Draft                                                T. Herbert
Intended status: Standard track                               Quantonium
Expires March 31, 2019

                                                      September 27, 2018

                       Generic TCP Encapsulation
                       draft-herbert-tsvwg-gte-00

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Internet Draft         Generic TCP Encapsulation      September 27, 2018

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Internet Draft         Generic TCP Encapsulation      September 27, 2018

Abstract          

   This specification describes Generic TCP Encapsulation (GTE) which is
   a method to encapsulate packets of different IP protocols within TCP
   data streams. Encapsulating packets in TCP facilitates communications
   across networks that block or sub-optimally handle non-TCP traffic.
   GTE is an adaptation of Generic UDP Encapsulation (GUE) to work in
   the context of TCP. GTE employs the GUE encapsulation format and
   optional extensions.

Table of Contents

   1  Introduction  . . . . . . . . . . . . . . . . . . . . . . . . .  5
     1.1 Requirements Language  . . . . . . . . . . . . . . . . . . .  5
   2  Encapsulation format  . . . . . . . . . . . . . . . . . . . . .  6
     2.1 GTE messages in a TCP stream . . . . . . . . . . . . . . . .  6
     2.2 TCP connections  . . . . . . . . . . . . . . . . . . . . . .  7
     2.3 Encapsulation with GUE variant 0 . . . . . . . . . . . . . .  7
     2.4 Encapsulation with GUE variant 1 . . . . . . . . . . . . . .  8
       2.4.1 IPv4 direct encapsulation  . . . . . . . . . . . . . . .  8
       2.4.2 IPv6 direct encapsulation  . . . . . . . . . . . . . . .  9
   3  Operation . . . . . . . . . . . . . . . . . . . . . . . . . . .  9
     3.1 Encapsulation flavors  . . . . . . . . . . . . . . . . . . .  9
       3.1.1 Network layer encapsulation  . . . . . . . . . . . . . .  9
       3.1.2 Transport layer encapsulation  . . . . . . . . . . . . . 10
     3.2 Encapsulator operation . . . . . . . . . . . . . . . . . . . 11
     3.3 Decapsulator operation . . . . . . . . . . . . . . . . . . . 11
       3.3.1 Receiving network layer encapsulation  . . . . . . . . . 11
       3.3.2 Receiving transport layer encapsulation  . . . . . . . . 12
       3.3.3 Error handling . . . . . . . . . . . . . . . . . . . . . 13
     3.4 Processing a received control message  . . . . . . . . . . . 13
     3.5 NAT interaction  . . . . . . . . . . . . . . . . . . . . . . 13
     3.6 Checksum offload of encapsulated transport checksum  . . . . 13
       3.6.1 Transmit checksum offload  . . . . . . . . . . . . . . . 14
       3.6.2 Receive checksum offload . . . . . . . . . . . . . . . . 14
     3.7 GUE extensions . . . . . . . . . . . . . . . . . . . . . . . 14
     3.8 Surplus area . . . . . . . . . . . . . . . . . . . . . . . . 14
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