netdev - Re: [PATCH] Revert "bridge: only expire the mdb entry when query is received"

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Message-ID: <CAM_iQpUq3EUu8GWsqbm_j9NonMGuWy0Qfimq1But9WrPsK8rbA@mail.gmail.com>
Date:	Mon, 21 Oct 2013 20:02:23 -0700
From:	Cong Wang <xiyou.wangcong@...il.com>
To:	Linus Lüssing <linus.luessing@....de>
Cc:	Linux Kernel Network Developers <netdev@...r.kernel.org>,
	bridge@...ts.linux-foundation.org,
	Stephen Hemminger <stephen@...workplumber.org>,
	"David S. Miller" <davem@...emloft.net>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] Revert "bridge: only expire the mdb entry when query is received"

On Sat, Oct 19, 2013 at 3:58 PM, Linus Lüssing <linus.luessing@....de> wrote:
> While this commit was a good attempt to fix issues occuring when no
> multicast querier is present, this commit still has two more issues:
>
> 1) There are cases where mdb entries do not expire even if there is a
> querier present. The bridge will unnecessarily continue flooding
> multicast packets on the according ports.
>
> 2) Never removing an mdb entry could be exploited for a Denial of
> Service by an attacker on the local link, slowly, but steadily eating up
> all memory.
>

I raised the first issue too when I sent the patch, but Herbert said
it is not a problem. So, I will leave this to Herbert to decide.

For me, your patch makes sense.

Thanks.
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