netdev - Re: [net-next,v5,2/3] bridge: only expire the mdb entry when query is received

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Message-ID: <20130619044438.GA8174@gondor.apana.org.au>
Date:	Wed, 19 Jun 2013 12:44:38 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Linus Lüssing <linus.luessing@....de>
Cc:	Amerigo Wang <amwang@...hat.com>, netdev@...r.kernel.org,
	Stephen Hemminger <stephen@...workplumber.org>,
	"David S. Miller" <davem@...emloft.net>,
	Adam Baker <linux@...er-net.org.uk>
Subject: Re: [net-next,v5,2/3] bridge: only expire the mdb entry when query
 is received

On Tue, Jun 18, 2013 at 02:03:38PM +0200, Linus Lüssing wrote:
> Hi Amerigo,
> 
> I just tested these three patches on top of 3.10-rc6 (thanks for
> looking into these issues so far!) but unfortunately I'm still
> having problems if there is no querier on the link:
> 
> We will never discover a multicast listener which sends its
> startup MLD reports before being attached to the bridge port.
> 
> I had reported that issue two months ago to Herbert's patch which
> changed the querier default [1].
> 
> I guess in such a scenario where neither our querier is activated
> nor could we detect any querier, then the only safe thing we can
> do is to disable the bridge multicast snooping, isn't it?

If we have seen no queries then we should simply flood.  The fact
that we don't currently is a bug.

Cheers,
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
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