netdev - Re: [PATCH iproute2-next 1/9] libnetlink: Set NLA_F_NESTED in rta

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Date:   Thu, 30 May 2019 11:50:59 -0600
From:   David Ahern <dsahern@...il.com>
To:     Stephen Hemminger <stephen@...workplumber.org>
Cc:     netdev@...r.kernel.org
Subject: Re: [PATCH iproute2-next 1/9] libnetlink: Set NLA_F_NESTED in
 rta_nest

On 5/30/19 11:43 AM, Stephen Hemminger wrote:
> 
> I assume older kernels ignore the attribute?
> 
> Also, how is this opt-in for running iproute2-next on old kernels?
> 

from what I can see older kernel added the flag when generating a nest
(users of nla_nest_start), but did not pay attention to the flag for
messages received from userspace.