netdev - Problem with iflink in netns

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Date:	Tue, 13 May 2014 08:39:45 -0700
From:	Stephen Hemminger <stephen@...workplumber.org>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	netdev@...r.kernel.org
Subject: Problem with iflink in netns

There have been a couple of bugzilla reports already about cases where a macvlan
or vlan is moved into another namespace. In these cases the parent device ifindex (iflink)
is no longer valid.

Normally it is not a big issue, until another device is created using the ifindex
of the parent

Does anyone have a suggested fix? Marking iflink as 0 won't work then the devices no
longer appear as slaves. Another possibility would be to make block creation of device
where ifindex matches existing iflink of other devices; but this would slow down device
creation.

The bugs come in as ip command bugs, but obviously the issue is in the kernel.

https://bugzilla.kernel.org/show_bug.cgi?id=66691
https://bugzilla.kernel.org/show_bug.cgi?id=75911
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