netdev - socket option IP_MSFILTER questions and observations

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Message-ID: <4F708E08.7040500@softathome.com>
Date:	Mon, 26 Mar 2012 17:40:56 +0200
From:	Cedric Jehasse <cedric.jehasse@...tathome.com>
To:	netdev@...r.kernel.org
Subject: socket option IP_MSFILTER questions and observations

Hi,

I'm trying to use source specific multicast by setting the IP_MSFILTER 
socket option. I noticed i need to join the group with IP_ADD_MEMBERSHIP 
before setting the source filter. This is not the behavior i expected 
after reading RFC3678.
A potential issue i'm thinking of with this approach: an IGMP report 
could be sent after joining a group but before the filter is set.
Is there a way to prevent this?

Thanks,
Cedric

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