linux-kernel - Re: [PATCH net] bridge: ebtables: fix reception of frames DNAT-ed to bridge device

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Date:   Sun, 19 Mar 2017 17:55:06 +0100
From:   Linus Lüssing <linus.luessing@...3.blue>
To:     Pablo Neira Ayuso <pablo@...filter.org>
Cc:     Florian Westphal <fw@...len.de>, netdev@...r.kernel.org,
        "David S . Miller" <davem@...emloft.net>,
        Stephen Hemminger <stephen@...workplumber.org>,
        Jozsef Kadlecsik <kadlec@...ckhole.kfki.hu>,
        bridge@...ts.linux-foundation.org, netfilter-devel@...r.kernel.org,
        coreteam@...filter.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net] bridge: ebtables: fix reception of frames DNAT-ed to
 bridge device

On Fri, Mar 17, 2017 at 02:10:44PM +0100, Pablo Neira Ayuso wrote:
> Wait.
> 
> May this break local multicast listener that are bound to the bridge
> interface? Assuming the bridge interface got an IP address, and that
> there is local multicast listener.
> 
> Missing anything here?

Hm, for multicast packets usually the code path a few lines
later in br_handle_frame_finish() should be taken instead.

But you might be right for IP multicast packets with a unicast MAC
destination (due to whatever reason, for instance via DNAT'ing
again).

Will check that - thanks!