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

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Message-ID: <CALCETrXMkV_1XR2mXOoO_2_vpB=6cPbWAAOhPFhPbDa_1P+zxw@mail.gmail.com>
Date:	Wed, 24 Sep 2014 10:05:59 -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 Wed, Sep 24, 2014 at 2:31 AM, Nicolas Dichtel
<nicolas.dichtel@...nd.com> wrote:
> Le 23/09/2014 21:26, Andy Lutomirski a écrit :
>
>> 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?
>
> With this serie no. I'm not sure if ancestors really needs to be able to
> get these ids. What is your opinion?

I might be missing some consideration here, but I would hope that ip
link would work correctly if I have a veth interface shared with a
netns that's in a child userns.

--Andy

-- 
Andy Lutomirski
AMA Capital Management, LLC
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