From: Linus Lüssing <linus.luess...@web.de>
Date: Mon, 10 Mar 2014 22:25:25 +0100

> Without this check someone could easily create a denial of service
> by injecting multicast-specific queries to enable the bridge
> snooping part if no real querier issuing periodic general queries
> is present on the link which would result in the bridge wrongly
> shutting down ports for multicast traffic as the bridge did not learn
> about these listeners.
> 
> With this patch the snooping code is enabled upon receiving valid,
> general queries only.
> 
> Signed-off-by: Linus Lüssing <linus.luess...@web.de>

Applied.
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