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Message-ID: <b6585989069fd832a65b73d1c4f4319a10714165.camel@linux.ibm.com>
Subject: Re: [PATCH v2 1/1] netfilter: nf_tables: fib: Drop IPV6 packages if
 IPv6 is disabled on boot
From:   Leonardo Bras <leonardo@linux.ibm.com>
To:     Pablo Neira Ayuso <pablo@netfilter.org>,
        Florian Westphal <fw@strlen.de>,
        "David S. Miller" <davem@davemloft.net>
Cc:     netfilter-devel@vger.kernel.org, coreteam@netfilter.org,
        netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
        Jozsef Kadlecsik <kadlec@netfilter.org>,
        Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>,
        Hideaki YOSHIFUJI <yoshfuji@linux-ipv6.org>
Date:   Thu, 29 Aug 2019 17:29:51 -0300
In-Reply-To: <db0f02c5b1a995fde174f036540a3d11008cf116.camel@linux.ibm.com>
References: <20190821141505.2394-1-leonardo@linux.ibm.com>
         <db0f02c5b1a995fde174f036540a3d11008cf116.camel@linux.ibm.com>
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On Thu, 2019-08-29 at 17:04 -0300, Leonardo Bras wrote:
> > Thats a good point -- Leonardo, is the
> > "net.bridge.bridge-nf-call-ip6tables" sysctl on?
>=20
> Running
> # sudo sysctl -a
> I can see:
> net.bridge.bridge-nf-call-ip6tables =3D 1

Also, doing
# echo 0 >  /proc/sys/net/bridge/bridge-nf-call-ip6tables=20
And then trying to boot the guest will not crash the host.

Which would make sense, since host iptables is not dealing with guest
IPv6 packets.

So, the real cause of this bug is the bridge making host ip6tables deal
with guest IPv6 packets ?=20
If so, would it be ok if write a patch testing ipv6_mod_enabled()
before passing guest ipv6 packets to host ip6tables?=20


Best regards,

> =20
> So this packets are sent to host iptables for processing?
>=20
>=20
> (Sorry for the delay, I did not received the previous e-mails.
> Please include me in to/cc.)

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