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From: Colin Leitner <colin.leitner@googlemail.com>
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Date: Sun, 13 Jul 2014 15:15:57 +0200
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Subject: Re: Adding IPv4 multicast support
To: Colin Leitner <colin.leitner@googlemail.com>, Antony Pavlov <antonynpavlov@gmail.com>
Cc: barebox@lists.infradead.org, Daniele Lacamera <daniele.lacamera@tass.be>

> 
> I'll probably just push the patches to a github repository until picotcp lands.
> 

Patches can be found at

    https://github.com/cleitner/barebox-mcast/tree/multicast

Commits

  * 8e99783f775ef8013ea9f5e5f9fa881002cd21a2
  * f5f78253ce2e48affbb0b3bf9726b3b6e684b509
  * 0dd506b341a61855b9b526c6c0de3da2d4c4e0a9

are small cleanups to the network code and could be merged even if multicast support is deemed unnecessary.

Multicast connections are used like any other UDP connection:

    con = net_udp_new(string_to_ip("224.0.0.123"), 12345, handler, priv);
    net_udp_bind(con, 12345);

I only patched the drivers smc91111 (tested) and smc911x (untested) to receive multicast packets. Other drivers are likely just as easy to patch.

Have fun,
	Colin

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