netdev - Re: [PATCH net-next 3/3] net: Add table id from route lookup to route response

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Date:	Wed, 2 Sep 2015 20:43:46 +0200
From:	Thomas Graf <tgraf@...g.ch>
To:	David Ahern <dsa@...ulusnetworks.com>
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH net-next 3/3] net: Add table id from route lookup to
 route response

On 09/02/15 at 09:40am, David Ahern wrote:
> rt_fill_info which is called for 'route get' requests hardcodes the
> table id as RT_TABLE_MAIN which is not correct when multiple tables
> are used. Use the newly added table id in the rtable to send back
> the correct table.
> 
> Signed-off-by: David Ahern <dsa@...ulusnetworks.com>

What RTM_GETROUTE returns is not the actual route but a description
of the routing decision which is why table id, scope, protocol, and
prefix length are hardcoded. This is indicated by the RTM_F_CLONED
flag. What you propose would break userspace ABI.
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