netdev - Re: commit : ppp: add rtnetlink device creation support

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Date:   Thu, 8 Dec 2016 10:29:44 +0800
From:   Brad Campbell <lists2009@...rfbargle.com>
To:     Thomas Haller <thaller@...hat.com>, Dan Williams <dcbw@...hat.com>,
        Guillaume Nault <g.nault@...halink.fr>
Cc:     netdev <netdev@...r.kernel.org>, Thomas Graf <tgraf@...g.ch>,
        David Miller <davem@...emloft.net>
Subject: Re: commit : ppp: add rtnetlink device creation support - breaks
 netcf on my machine.

On 08/12/16 01:43, Thomas Haller wrote:
> On Tue, 2016-12-06 at 17:12 -0600, Dan Williams wrote:
>>
>>> libnl1 rejects the IFLA_INFO_DATA attribute because it expects it
>>> to
>>> contain a sub-attribute. Since the payload size is zero it doesn't
>>> match the policy and parsing fails.
>>>
>>> There's no problem with libnl3 because its policy accepts empty
>>> payloads for NLA_NESTED attributes (see libnl3 commit 4be02ace4826
>
> Hi,
>
> libnl1 is unmaintained these days. I don't think it makes sense to
> backport that patch. The last upstream release was 3+ years ago, with
> no upstream development since then.
>
> IMHO netcf should drop libnl-1 support.
>

G'day Thomas,

I'm not sure anyone was suggesting fixing libnl1, it was more around a 
discussion with regard to a change in the kernel breaking old userspace 
and whether it needs to be fixed in the kernel.

Personally, now I have a solution to *my* immediate problem (that being 
any kernel 4.7 or later prevented libvirtd starting on my servers 
because my netcf was compiled against libnl1) I can upgrade the relevant 
userspace components to work around the issue.

Also, now this issue is a number of months old and I appear to be the 
only person reporting it, maybe it's not worth tackling. I would 
absolutely say that netcf needs to drop libnl1 now though as it *is* 
broken on newer kernels under the right circumstances.

I appreciate the assistance in tracking it down anyway. Thanks guys.

Regards,
Brad