netdev - Re: [RFC PATCH net-next v2 0/5] netns: allow to identify peer netns

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Message-ID: <5423D808.7050800@6wind.com>
Date:	Thu, 25 Sep 2014 10:53:28 +0200
From:	Nicolas Dichtel <nicolas.dichtel@...nd.com>
To:	Cong Wang <cwang@...pensource.com>
CC:	netdev <netdev@...r.kernel.org>,
	containers@...ts.linux-foundation.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-api@...r.kernel.org, David Miller <davem@...emloft.net>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Stephen Hemminger <stephen@...workplumber.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andy Lutomirski <luto@...capital.net>
Subject: Re: [RFC PATCH net-next v2 0/5] netns: allow to identify peer netns

Le 24/09/2014 18:48, Cong Wang a écrit :
> On Wed, Sep 24, 2014 at 9:31 AM, Nicolas Dichtel
> <nicolas.dichtel@...nd.com> wrote:
>>> I think in this case your ID's are still available, but aren't you
>>> providing a new way
>>> for the inner netns device to escape which we are trying to avoid?
>>
>> It's why the ids depend on user ns. Only if user ns are the same we allow to
>> get an id for a peer netns.
>
> Too late, userns is relatively new, relying on it breaks our existing
> assumption.
>
I don't get your point. netns has been added in kernel after user ns:
acce292c82d4 user namespace: add the framework => 2.6.23
5f256becd868 [NET]: Basic network namespace infrastructure. => 2.6.24

In the kernel, each netns is linked with a user ns.
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