netdev - Re: [PATCH net-next v2 0/8] net: extend RTM

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Message-ID: <8d6cf942-6d24-2cbc-bf5b-650d570927bb@gmail.com>
Date:   Sat, 27 May 2017 08:02:40 -0600
From:   David Ahern <dsahern@...il.com>
To:     Roopa Prabhu <roopa@...ulusnetworks.com>,
        David Miller <davem@...emloft.net>
Cc:     Rami Rosen <rami.rosen@...el.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Nikolay Aleksandrov <nikolay@...ulusnetworks.com>
Subject: Re: [PATCH net-next v2 0/8] net: extend RTM_GETROUTE to return fib
 result

On 5/27/17 12:00 AM, Roopa Prabhu wrote:
> On Fri, May 26, 2017 at 11:18 AM, David Miller <davem@...emloft.net> wrote:
>> From: Roopa Prabhu <roopa@...ulusnetworks.com>
>> Date: Thu, 25 May 2017 10:42:32 -0700
>>
>>> This series adds a new RTM_F_FIB_MATCH flag to return matched fib result
>>> with RTM_GETROUTE. This is useful for applications and protocols in
>>> userspace wanting to query the selected route.
>>
>> Looks good, series applied, thanks.
>>
> 
> thank you.
> 
>> Have you considered taking this further and allowing one to see which
>> nexthop a route lookup picked?
> 
> since the default RTM_GETROUTE output gives most of the attributes
> from the resolved dst,
> have not considered adding more to it yet...but certainly can if
> needed in the future.
> 

One extension is to pass in prefix and length (plus any options to such
as metric to uniquely discriminate a route) and get back the route
entry. It is needed to retrieve the BPF code for routes with a bpf
encap. This patch set makes it easier.