netdev - Re: Problem with iflink in netns

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Message-ID: <CAHA+R7M=8TnW-_R8kzkRgr0aX5y09ek7BAoiKT7+AVGtO=Y8gQ@mail.gmail.com>
Date:	Wed, 14 May 2014 14:11:22 -0700
From:	Cong Wang <cwang@...pensource.com>
To:	Stephen Hemminger <stephen@...workplumber.org>
Cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	netdev <netdev@...r.kernel.org>
Subject: Re: Problem with iflink in netns

On Tue, May 13, 2014 at 5:51 PM, Stephen Hemminger
<stephen@...workplumber.org> wrote:
> On Tue, 13 May 2014 13:44:24 -0700
> Cong Wang <cwang@...pensource.com> wrote:
>
>> On Tue, May 13, 2014 at 1:05 PM, Stephen Hemminger
>> <stephen@...workplumber.org> wrote:
>> >
>> > That won't solve the problem.
>> >  1. a pointer increase size of netns and requires refcount
>>
>> Yes.
>>
>> >  2. iflink is still exposed in kernel user API and has to be set
>> >     otherwise the device is falsely reported.
>>
>> Then report 0 which is not a valid ifindex?
>
> But that is what devices without a parent report.

Its parent of out of this netns, so this is expected. This is no way
to express "it's in another netns" with just ifindex. Maybe a new flag
would help.
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