From mboxrd@z Thu Jan  1 00:00:00 1970
From: Linus =?utf-8?Q?L=C3=BCssing?= <linus.luessing@c0d3.blue>
Subject: Re: [PATCH net] bridge: ebtables: fix reception of frames DNAT-ed to
 bridge device
Date: Wed, 15 Mar 2017 22:16:19 +0100
Message-ID: <20170315211619.GA3464@otheros>
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 <20170315104211.GA24409@salvia>
 <20170315142720.GU15692@otheros>
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Cc: Florian Westphal <fw@strlen.de>, netdev@vger.kernel.org,
        "David S . Miller" <davem@davemloft.net>,
        Stephen Hemminger <stephen@networkplumber.org>,
        Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>,
        bridge@lists.linux-foundation.org, netfilter-devel@vger.kernel.org,
        coreteam@netfilter.org, linux-kernel@vger.kernel.org
To: Pablo Neira Ayuso <pablo@netfilter.org>
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On Wed, Mar 15, 2017 at 07:15:39PM +0100, Pablo Neira Ayuso wrote:
> Could you update ebtables dnat to check if the ethernet address
> matches the one of the input bridge interface, so we mangle the
> ->pkt_type accordingly from there, instead of doing this from the
> core?

Actually, that was the approach I thought about and went for first
(and it would probably work for me). Just checking against the
bridge device's net_device::dev_addr.

I scratched it though, as I was afraid that the issue might still
exist for people using some other upper device on top of the bridge
device. For instance, macvlan? And iterating over the
net_device::dev_addrs list seemed too costly for fast path to me.