From: Pablo Neira Ayuso <pablo@netfilter.org>
To: Oliver <olipro@8.c.9.b.0.7.4.0.1.0.0.2.ip6.arpa>
Cc: netfilter-devel@vger.kernel.org
Subject: Re: [PATCH] death_by_event() does not check IPS_DYING_BIT - race condition against ctnetlink_del_conntrack
Date: Thu, 30 Aug 2012 20:39:50 +0200 [thread overview]
Message-ID: <20120830183950.GB13190@1984> (raw)
In-Reply-To: <10622350.k1HJ7t2ROS@gentoovm>
On Thu, Aug 30, 2012 at 07:49:24PM +0200, Oliver wrote:
> On Thursday 30 August 2012 18:22:48 you wrote:
> > Unfortunately, asymmetric active-active is a crazy setup for conntrack
> > (documentation already discuss this). The state synchronization that
> > we are doing is asynchronous, so state-updates race with TCP packet.
> > We don't support this, sorry.
>
> The environment does fulfil the assumptions necessary for replication to happen
> within the handshake so under 3.2 there is no issue with handshakes completing
> under an asymmetric path.
Interesting, how are those assumptions fulfilled?
> Nonetheless, what doesn't make sense is that this operates under 3.2 and not
> 3.4 - also is the fact that having a "-j CT --notrack" on specific traffic (i.e.
> asymmetric should not matter because there is no stateful tracking)
Agreed. But I don't come with any netfilter change that may result in
that problem you're reporting. You'll have to debug this and get back
to me with more information.
next prev parent reply other threads:[~2012-08-30 18:39 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-08-27 9:33 [PATCH] death_by_event() does not check IPS_DYING_BIT - race condition against ctnetlink_del_conntrack Oliver
2012-08-28 10:52 ` Pablo Neira Ayuso
2012-08-28 17:16 ` Oliver
2012-08-28 23:10 ` Oliver
2012-08-30 0:52 ` Pablo Neira Ayuso
2012-08-30 2:05 ` Oliver
2012-08-30 2:25 ` Pablo Neira Ayuso
[not found] ` <5427975.6moJlq4F9d@gentoovm>
[not found] ` <20120830025009.GA16782@1984>
2012-08-30 3:09 ` Oliver
2012-08-30 10:34 ` Pablo Neira Ayuso
2012-08-30 12:28 ` Oliver
2012-08-30 12:39 ` Oliver
2012-08-30 16:22 ` Pablo Neira Ayuso
2012-08-30 17:49 ` Oliver
2012-08-30 18:39 ` Pablo Neira Ayuso [this message]
2012-08-31 0:19 ` Oliver
2012-08-31 9:27 ` Pablo Neira Ayuso
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