netdev - Re: [RFC] SPD basic actions per netdev

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Date:	Thu, 01 Apr 2010 07:52:34 +0300
From:	Timo Teräs <timo.teras@....fi>
To:	Herbert Xu <herbert@...dor.apana.org.au>
CC:	jamal <hadi@...erus.ca>, "David S. Miller" <davem@...emloft.net>,
	Patrick McHardy <kaber@...sh.net>, netdev@...r.kernel.org
Subject: Re: [RFC] SPD basic actions per netdev

Herbert Xu wrote:
> On Wed, Mar 31, 2010 at 10:35:23PM -0400, jamal wrote:
>> On Thu, 2010-04-01 at 08:33 +0800, Herbert Xu wrote:
>>
>>> If we're going to change this then we should just add a second
>>> interface field to the selector, rather than trying to overload
>>> the existing one.
>> Do you mean to have a selector->iif/oif? Sure that makes sense - but is
>> a much larger surgery and user space will need to be taught.
>>
>> Did you look at the patch i sent? i tried to retain current behavior
>> except for the input check path. output path was working in classifying
>> with specific netdevs. 
> 
> OK, I guess the chances of an existing app breaking is slim.
> 
> BTW, you should treat FLOW_DIR_FWD as FLOW_DIR_IN.

I think we need iif and oif. The separation is clear in in/fwd policies,
as each is matched properly. But 'out' policies are used for both:
locally generated, and forwarded traffic.

Basically it goes like:
 in - for policy_check for traffic that is received locally
 fwd - for policy_check for traffic that is forwarded
 out - all (local and forwarded) traffic that goes out of box

IMHO, it's slightly confusing that in/fwd is split, but out is not.
But that's the way it works. If you now override the how interface
is checked for 'out' policy, it'll break current behaviour.

- Timo

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