linux-kernel - Re: [PATCHv2 2/2] bridge: multicast: enable snooping on general queries only

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Message-Id: <20140311.232331.953854418721439734.davem@davemloft.net>
Date:	Tue, 11 Mar 2014 23:23:31 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	linus.luessing@....de
Cc:	netdev@...r.kernel.org, bridge@...ts.linux-foundation.org,
	stephen@...workplumber.org, linux-kernel@...r.kernel.org,
	jstancek@...hat.com, fwestpha@...hat.com
Subject: Re: [PATCHv2 2/2] bridge: multicast: enable snooping on general
 queries only

From: Linus Lüssing <linus.luessing@....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.luessing@....de>

Applied.
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