linux-kernel - Re: [PATCH] namespace: Add an identifier to the namespace file

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Date:	Wed, 26 Sep 2012 19:30:01 -0700
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	minyard@....org
Cc:	Corey Minyard <cminyard@...sta.com>,
	Eric Dumazet <eric.dumazet@...il.com>,
	"Serge E. Hallyn" <serge@...lyn.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] namespace: Add an identifier to the namespace file

Corey Minyard <tcminyard@...il.com> writes:

> On 09/26/2012 07:48 PM, Eric W. Biederman wrote:
>> For netfilter or any other interface what should happen is that a file
>> descriptor is passed in and the network namespace is derived from the
>> file descriptor.
>>
>> Given that netfilter is per network namespace I'm not certain how
>> filtering per network namespace would make sense.
>>
>> When I have poked my nose into netfilter I have had the hard problem
>> that I have not figured out how to translate the parameters supplied
>> by userspace into a more appropriate in kernel form, so I'm not certain
>> how to implement passing a file descriptor into netfilter efficiently.
>
> Yeah, that's kind of where I am stuck, too. netfilter used to be global,
> so if it's not, this may be a "You can't do that any more".

I expect this will come down closer to you can't do it that way anymore.

Eric
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