linux-kernel - Re: [PATCH 2/2] bridge: Use IPv6 link-local address for multicast listener queries

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Message-Id: <20110222.100823.189696335.davem@davemloft.net>
Date:	Tue, 22 Feb 2011 10:08:23 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	linus.luessing@....de
Cc:	shemminger@...ux-foundation.org, bridge@...ts.linux-foundation.org,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	herbert@...dor.apana.org.au, yoshfuji@...ux-ipv6.org
Subject: Re: [PATCH 2/2] bridge: Use IPv6 link-local address for multicast
 listener queries

From: Linus Lüssing <linus.luessing@....de>
Date: Thu, 17 Feb 2011 19:17:52 +0100

> Currently the bridge multicast snooping feature periodically issues
> IPv6 general multicast listener queries to sense the absence of a
> listener.
> 
> For this, it uses :: as its source address - however RFC 2710 requires:
> "To be valid, the Query message MUST come from a link-local IPv6 Source
> Address". Current Linux kernel versions seem to follow this requirement
> and ignore our bogus MLD queries.
> 
> With this commit a link local address from the bridge interface is being
> used to issue the MLD query, resulting in other Linux devices which are
> multicast listeners in the network to respond with a MLD response (which
> was not the case before).
> 
> Signed-off-by: Linus Lüssing <linus.luessing@....de>

Applied.
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