netdev - Re: [PATCH 1/4] veth: move loopback logic to common location

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Message-ID: <m1r5rlz1eq.fsf@fess.ebiederm.org>
Date:	Thu, 26 Nov 2009 08:38:53 -0800
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Patrick McHardy <kaber@...sh.net>
Cc:	Arnd Bergmann <arnd@...db.de>, David Miller <davem@...emloft.net>,
	virtualization@...ts.linux-foundation.org,
	Herbert Xu <herbert@...dor.apana.org.au>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Anna Fischer <anna.fischer@...com>, netdev@...r.kernel.org,
	bridge@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
	Mark Smith <lk-netdev@...netdev.nosense.org>,
	Gerhard Stenzel <gerhard.stenzel@...ibm.com>,
	Jens Osterkamp <jens@...ux.vnet.ibm.com>,
	Patrick Mullaney <pmullaney@...ell.com>,
	Stephen Hemminger <shemminger@...tta.com>
Subject: Re: [PATCH 1/4] veth: move loopback logic to common location

Patrick McHardy <kaber@...sh.net> writes:

> Arnd Bergmann wrote:
>> On Tuesday 24 November 2009, Patrick McHardy wrote:
>>> Eric W. Biederman wrote:
>>>> I don't quite follow what you intend with dev_queue_xmit when the macvlan
>>>> is in one namespace and the real physical device is in another.  Are
>>>> you mentioning that the packet classifier runs in the namespace where
>>>> the primary device lives with packets from a different namespace?
>>> Exactly. And I think we should make sure that the namespace of
>>> the macvlan device can't (deliberately or accidentally) cause
>>> misclassification.
>> 
>> This is independent of my series and a preexisting problem, right?
>
> Correct.
>
>> Which fields do you think need to be reset to maintain namespace
>> isolation for the outbound path in macvlan?
>
> In addition to those already handled, I'd say
>
> - priority: affects qdisc classification, may refer to classes of the
>   old namespace
> - ipvs_property: might cause packets to incorrectly skip netfilter hooks
> - nf_trace: might trigger packet tracing
> - nf_bridge: contains references to network devices in the old NS,
>   also indicates packet was bridged
> - iif: index is only valid in the originating namespace
> - tc_index: classification result, should only be set in the namespace
>   of the classifier
> - tc_verd: RTTL etc. should begin at zero again
> - probably secmark.

Wow.  I thought we were trying to reduce skbuff, where did all of those
fields come from?  Regarless that sounds like a good list to get stomped.

Eric

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