From: Pablo Neira Ayuso <pablo@netfilter.org>
To: Florian Westphal <fw@strlen.de>
Cc: David Miller <davemdavemloft!net@strlen.de>,
netfilter-devel@vger.kernel.org
Subject: Re: [PATCH v2 1/1] netfilter: nf_tables: fib: Drop IPV6 packages if IPv6 is disabled on boot
Date: Wed, 28 Aug 2019 10:19:42 +0200 [thread overview]
Message-ID: <20190828081942.isdjcdvcqok2a6zz@salvia> (raw)
In-Reply-To: <20190827215836.GA10942@strlen.de>
On Tue, Aug 27, 2019 at 11:58:36PM +0200, Florian Westphal wrote:
> David Miller <davemdavemloft!net> wrote:
> > From: Leonardo Bras <leonardo@linux.ibm.com>
> > Date: Tue, 27 Aug 2019 14:34:14 -0300
> >
> > > I could reproduce this bug on a host ('ipv6.disable=1') starting a
> > > guest with a virtio-net interface with 'filterref' over a virtual
> > > bridge. It crashes the host during guest boot (just before login).
> > >
> > > By that I could understand that a guest IPv6 network traffic
> > > (viavirtio-net) may cause this kernel panic.
> >
> > Really this is bad and I suspected bridging to be involved somehow.
>
> Thats a good point -- Leonardo, is the
> "net.bridge.bridge-nf-call-ip6tables" sysctl on?
>
> As much as i'd like to send a patch to remove br_netfilter, I fear
> we can't even stop passing ipv6 packets up to netfilter if
> ipv6.disable=1 is set because users might be using ip6tables for
> bridged traffic.
If the br_netfilter module is in placed, then it's probably better to
perform this check from there.
next prev parent reply other threads:[~2019-08-28 8:19 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-21 14:15 [PATCH v2 1/1] netfilter: nf_tables: fib: Drop IPV6 packages if IPv6 is disabled on boot Leonardo Bras
2019-08-27 10:35 ` Pablo Neira Ayuso
2019-08-27 17:34 ` Leonardo Bras
2019-08-27 18:51 ` Pablo Neira Ayuso
2019-08-27 18:55 ` Leonardo Bras
2019-08-27 21:19 ` David Miller
2019-08-27 21:58 ` Florian Westphal
2019-08-28 8:19 ` Pablo Neira Ayuso [this message]
2019-08-28 10:17 ` Florian Westphal
2019-08-29 20:04 ` Leonardo Bras
2019-08-29 20:29 ` Leonardo Bras
2019-08-29 20:58 ` Florian Westphal
2019-08-30 14:15 ` Leonardo Bras
2019-08-30 15:48 ` Leonardo Bras
2019-08-30 15:58 ` Florian Westphal
2019-08-30 18:16 ` Leonardo Bras
2019-08-29 20:29 ` Florian Westphal
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