netdev - Re: [PATCH] Multicast: Avoid useless duplication of multicast messages

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Date:	Wed, 15 Apr 2009 15:17:33 -0400 (EDT)
From:	Christoph Lameter <cl@...ux.com>
To:	Vlad Yasevich <vladislav.yasevich@...com>
cc:	Neil Horman <nhorman@...driver.com>, netdev@...r.kernel.org,
	David Miller <davem@...emloft.net>,
	David Stevens <dlstevens@...ibm.com>
Subject: Re: [PATCH] Multicast: Avoid useless duplication of multicast
 messages

On Wed, 15 Apr 2009, Vlad Yasevich wrote:

> Looking at BSD, which was the root of the original brokeness, they have it fixed.
> The code will skip sockets that are not members of a particular group.  So, we
> are trying really hard to stay bug-for-bug compatible with old implementations.

Ahh interesting. David: Could you say something on this?

> What's worse is that if you have a socket that doesn't care about any mulicast
> destinations (never did an ADD_MEMBERSHIP), it will still get multicast traffic if
> it bound to that port.
>
> We need to take into account the socket's multicast group list.

Right. The fix is pretty simple too since the infrastructure has been
there since the IGMPv3 updates.

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