On Tue, May 13, 2014 at 1:05 PM, Stephen Hemminger
[off-list ref] 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?