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Date: Thu, 12 Oct 2017 07:58:34 -0700
From: Stephen Hemminger <stephen@networkplumber.org>
Message-ID: <20171012075834.78103e4d@xeon-e3>
In-Reply-To: <CAPfKRs4GmA4568nt4a2kaHkmm3WmMETL1sXcT8xyByCvVGgFkQ@mail.gmail.com>
References: <CAPfKRs4GmA4568nt4a2kaHkmm3WmMETL1sXcT8xyByCvVGgFkQ@mail.gmail.com>
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Subject: Re: [Bridge] Problem with syslog in bridge(?) with ethernet
 broadcast packets with QinQ
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To: =?UTF-8?B?QW5kcsOpcw==?= Pozo =?UTF-8?B?TXXDsW96?= <andres.pozom@gmail.com>
Cc: bridge@lists.linux-foundation.org

On Mon, 18 Sep 2017 17:21:11 +0200
Andr=C3=A9s Pozo Mu=C3=B1oz <andres.pozom@gmail.com> wrote:

> Hi all,
>=20
> I'm facing some problem with ethernet multicast traffic and QinQ
> (802.3q in both tags) in -apparently- a bridge in Ubuntu 16.04
> (4.12.0-041200-generic).
>=20
> My set up is the following:
> +-----------+
> |     VM    |
> +-----+-----+
>       |
>       | tag 55
> +---------+------------+
> |        OVS           |
> +-----------+----------+
>                 | veth3.9
> veth3   +  |
>      +--+
>      | veth2
> +-------+----------+
> |       BRIDGE     |
> +-------+----------+
>      |
>      |
> +-------+----------+
> |      ens11f1     |
> +------------------+
>=20
>=20
> I am setting the inner tag with OVS and the outer tag with a vlan type ve=
th.
> The problem I have is that every packet sent from the VM to Ethernet
> broadcast addresses (33:33:xx:xx:xx:xx) generates a "IPv6 header not
> found" entry in syslog.
>=20
> If I generate a 'ens11f1.9' interface and remove the BRIDGE, the log
> entry dissapears.
>=20
> Some questions:
> * Is there any problem with these packets (ethernet multicast with
> QinQ) in bridges?
> * Is there any configuration I should change for the problem to dissapear?
>=20
> Thanks in advance for your help! Any hint about what could be
> generating those logs is appreciated.
>=20
> Regards,
> Andr=C3=A9s Pozo

Where is the log message coming from? Could you change the printk into
a WARN_ON_ONCE and get backtrace? My guess is the firewall code doesn't
understand the additional tag.