✎ soc:nikhil:under_construction

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====== Implementing IPv6 support in gPXE ======

===== About the project =====
My project is titled Implementing IPv6 support in gPXE. Here are some snippets from [[soc:nikhil:proposal|my proposal]].

==== Synopsis ====
gPXE uses uIP to implement its TCP/IP stack. uIP is an implementation of the TCP/IP stack which uses a fraction of the resources used by a full fledged TCP/IP implementation.

The project is to implement support for IPv6. uIP (in its current avatar) tightly integrates the TCP and IP layers in order to save code size. As a result, it is not easy to replace IPv4 with any other network layer protocol in uIP. This project aims to re-design the TCP/IP stack of gPXE in order to facilitate IPv6 implementation.

==== Deliverables ====
The final deliverables for the project are:
  - A clean, well-defined interface between the transport-layer and network-layer. The interface would be generic enough to allow any transport layer protocol to interact with any network layer protocol
  - Re-design and implementation of the TCP/IP stack using the proposed interface (which fits within the gPXE API)
  - Minimal support for IPv6

The stretch goals for the project are:
  - Extension of the gPXE API to include UDP
  - An implementation of UDP/IP (within the extended gPXE API)
  - Support for additional features in IPv6

==== Plan of action ====

Main goals:
  - <del>Investigate the working of uIP</del>
  - <del>Define bare necessary requirements of transport layer and network layer</del>
  - <del>Define the interface between these layers based on the requirements</del>
  - Implement the TCP, IP modules using the interface
  - Test implementation; Re-implement if necessary
  - Increase requirements if necessary and go back to step 2
  - Investigate minimum requirements to support IPv6
  - Extend interface/requirements if necessary and go back to step 2
  - Implement IPv6
  - If time permits, implement stretch goals


Stretch goals:
  - Investigate UDP implementation in Etherboot-5.4 and earlier
  - Extend interface/requirements if necessary and perform steps 2 - 5
  - Implement UDP support
  - Investigate various features that can be added to IPv6
  - Perform steps 7 - 8

===== Current status =====

I have tried to update my blog ss frequently as possible with my thoughts. I have listed below my understanding of the problem.

==== Working of the network infrastructure ====

=== Receiving data ===

=== Sending data ===

=== So, what's wrong? ===

==== Redesigning the IP layer ====

=== IPv4 ===

=== IPv6 ===

==== Redesigning the transport layer ====

=== UDP ===

=== TCP ===

===== The road ahead =====

==== Ideas and concepts ====

==== To do list ====

===== Resources =====

  * [[http://implementingipv4.blogspot.com|My blog]]
  * [[http://www.sics.se/~adam/uip/|uIP Project Page]]
  * [[http://playground.sun.com/pub/ipng/html/ipng-main.html|IPv6 resources on sun.com]]

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