NetlinkProposal [FreeBSD WIKI]

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====== Netlink in FreeBSD ======
  * Student: Sean Ng (seanngpengnam@gmail.com)
  * Mentor:  Alexander V. Chernikov (melifaro@)

===== Project description =====

Refer to https://github.com/pengnam/freebsd-netlink for project details

Netlink is a linux kernel interface used for communication between userspace and kernel processes.

This project aims to port Netlink over to %%FreeBSD%%. The goal is to implement NETLINK_ROUTE in %%FreeBSD%%, and eventually support NETLINK_GENERIC as well. Eventually, the project aims to have a program use netlink.
Currently, systems in %%FreeBSD%% which use Netlink sockets in their equivalent implementations in linux are currently supported by routing sockets.

===== Approach to solving the problem =====

To implement Netlink for NETLINK_ROUTE, the development process will broken into three main stages:

  - Constructing basic interfaces
    - Registering handlers with socket: Register handler with socket API for AF_NETLINK address family
    - Configuring code as a configurable module

  - Interact with the routing subsystem
    - Message passing, message translating to an internal format, passing the code into a route subsystem
    - Replying with confirmation

  - Hack net/frr or net/bird2 to use netlink support

===== Deliverables =====
  - Implement basic interfaces for netlink socket connection and message sending [DONE]
  - Interact with the routing subsystem to implement NETLINK_ROUTE functionalities [DONE]
  - Extend to NETLINK_GENERIC [PARTIALLY DONE]

===== Milestones =====

  * June 8th: Start of GSOC
    * Check out previous work done, try compiling (X)
    * Get a working example 
  * July 13th - July 17th: Mid-term Evaluations #1
  * August 6th: End of coding (soft)
    * Remaining time used for documentation
  * August 14th: End of coding (hard)

===== The Code =====
Netlink: https://github.com/pengnam/freebsd-netlink ([[https://github.com/pengnam/freebsd-netlink/pull/1]])
Userspace Library: https://github.com/pengnam/libmnl-freebsd

===== Notes =====
https://docs.google.com/document/d/1oJSueoRWLDq9T9aLoYQzJGskPv7xiPCNG0iv8obwfGE/
https://github.com/pengnam/netlink-notes

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{{tag>Gsoc}}