linux-kernel - Re: [PATCH net-next 1/9] openvswitch: Scrub packet in ovs_vport

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Message-ID: <20150801191741.GA13837@pox.localdomain>
Date:	Sat, 1 Aug 2015 21:17:41 +0200
From:	Thomas Graf <tgraf@...g.ch>
To:	Joe Stringer <joestringer@...ira.com>
Cc:	Hannes Frederic Sowa <hannes@...hat.com>,
	Linux Netdev List <netdev@...r.kernel.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Pablo Neira Ayuso <pablo@...filter.org>,
	Patrick McHardy <kaber@...sh.net>,
	Justin Pettit <jpettit@...ira.com>,
	Pravin Shelar <pshelar@...ira.com>,
	Andy Zhou <azhou@...ira.com>, Jesse Gross <jesse@...ira.com>,
	Florian Westphal <fwestpha@...hat.com>
Subject: Re: [PATCH net-next 1/9] openvswitch: Scrub packet in
 ovs_vport_receive()

On 07/31/15 at 10:51am, Joe Stringer wrote:
> On 31 July 2015 at 07:34, Hannes Frederic Sowa <hannes@...hat.com> wrote:
> > In general, this shouldn't be necessary as the packet should already be
> > scrubbed before they arrive here.
> >
> > Could you maybe add a WARN_ON and check how those skbs with conntrack
> > data traverse the stack? I also didn't understand why make it dependent
> > on the socket.
> 
> OK, sure. One case I could think of is with an OVS internal port in
> another namespace, directly attached to the bridge. I'll have a play
> around with WARN_ON and see if I can come up with something more
> trimmed down.

The OVS internal port will definitely pass through an unscrubbed
packet across namespaces. I think the proper thing to do would be
to scrub but conditionally keep metadata.
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