linux-kernel - Re: [PATCHv2 1/2] bridge: multicast: add sanity check for general query destination

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Message-Id: <20140311.232325.2172162494177450404.davem@davemloft.net>
Date:	Tue, 11 Mar 2014 23:23:25 -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 1/2] bridge: multicast: add sanity check for general
 query destination

From: Linus Lüssing <linus.luessing@....de>
Date: Mon, 10 Mar 2014 22:25:24 +0100

> General IGMP and MLD queries are supposed to have the multicast
> link-local all-nodes address as their destination according to RFC2236
> section 9, RFC3376 section 4.1.12/9.1, RFC2710 section 8 and RFC3810
> section 5.1.15.
> 
> Without this check, such malformed IGMP/MLD queries can result in a
> denial of service: The queries are ignored by most IGMP/MLD listeners
> therefore they will not respond with an IGMP/MLD report. However,
> without this patch these malformed MLD queries would enable the
> snooping part in the bridge code, potentially shutting down the
> according ports towards these hosts for multicast traffic as the
> bridge did not learn about these listeners.
> 
> Reported-by: Jan Stancek <jstancek@...hat.com>
> Signed-off-by: Linus Lüssing <linus.luessing@....de>

Applied.
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