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

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Message-ID: <CALCETrWnZtWstBviDxcHpLpjHF3R+sgS48RYf2pbKBYeExZVOQ@mail.gmail.com>
Date:	Tue, 23 Sep 2014 12:26:37 -0700
From:	Andy Lutomirski <luto@...capital.net>
To:	Nicolas Dichtel <nicolas.dichtel@...nd.com>
Cc:	Network Development <netdev@...r.kernel.org>,
	Linux Containers <containers@...ts.linux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Linux API <linux-api@...r.kernel.org>,
	"David S. Miller" <davem@...emloft.net>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Stephen Hemminger <stephen@...workplumber.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [RFC PATCH net-next v2 0/5] netns: allow to identify peer netns

On Tue, Sep 23, 2014 at 6:20 AM, Nicolas Dichtel
<nicolas.dichtel@...nd.com> wrote:
> The goal of this serie is to be able to multicast netlink messages with an
> attribute that identify a peer netns.
> This is needed by the userland to interpret some informations contained in
> netlink messages (like IFLA_LINK value, but also some other attributes in case
> of x-netns netdevice (see also
> http://thread.gmane.org/gmane.linux.network/315933/focus=316064 and
> http://thread.gmane.org/gmane.linux.kernel.containers/28301/focus=4239)).
>
> Ids are stored in the parent user namespace. These ids are valid only inside
> this user namespace. The user can retrieve these ids via a new netlink messages,
> but only if peer netns are in the same user namespace.

What about the parent / ancestors of the owning userns?  Can processes
in those usernses see any form of netns id?

--Andy
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