netdev - Re: netlink: 12 bytes leftover after parsing attributes - triggered by iproute2 libnetlink's rtnl_dump

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Date:	Tue, 20 Mar 2012 16:00:23 +0100
From:	Bruno Prémont <bonbons@...ux-vserver.org>
To:	Stephen Hemminger <shemminger@...tta.com>
Cc:	netdev@...r.kernel.org, Greg Rose <gregory.v.rose@...el.com>
Subject: Re: netlink: 12 bytes leftover after parsing attributes - triggered
 by iproute2 libnetlink's rtnl_dump_request()

On Tue, 20 Mar 2012 07:41:40 Stephen Hemminger wrote:
> > Should this get fixed at kernel level, iproute2 libnetlink level or
> > at end-user level (e.g. collectd)?
> > Three lines every 10 seconds is a damn lot!
> > 
> > Thanks,
> > Bruno
> 
> Netlink is supposed to be encoded as Type-Length-Value and correctly written
> programs ignore types they don't understand. So either the library is getting
> confused by the type or the attribute is not encoded correctly.
> 
> 
> The issue could be in libnetlink library. What version of collectd and libnetlink
> are you using?

I've used collectd-5.0.x and collectd-4.10.3 with 3.3 kernels.
The stub code I listed is what collectd's netlink plugin does with
libnetlink (processing of netlink reply factored out for short-ness)

In all cases, linked against libnetlink from iproute2-2.6.38 (on
Gentoo)


>From looking at git history of both collectd and iproute2, on both
sides there has not been any changes that would affect the result.

Collectd:
  http://git.verplant.org/?p=collectd.git;a=history;f=src/netlink.c;hb=HEAD


Bruno
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