netdev - Re: [PATCH net-next] ipv6: export IP6_RT_PRIO

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Message-ID: <5097F5DF.7040507@6wind.com>
Date:	Mon, 05 Nov 2012 18:22:39 +0100
From:	Nicolas Dichtel <nicolas.dichtel@...nd.com>
To:	David Miller <davem@...emloft.net>
CC:	netdev@...r.kernel.org
Subject: Re: [PATCH net-next] ipv6: export IP6_RT_PRIO_* to userland

Le 05/11/2012 18:00, David Miller a écrit :
> From: Nicolas Dichtel <nicolas.dichtel@...nd.com>
> Date: Mon,  5 Nov 2012 16:28:18 +0100
>
>> The kernel uses some default metric when routes are managed. For example, a
>> static route added with a metric set to 0 is inserted in the kernel with
>> metric 1024 (IP6_RT_PRIO_USER).
>> It is useful for routing daemons to know these values, to be able to set routes
>> without interfering with what the kernel does.
>>
>> Signed-off-by: Nicolas Dichtel <nicolas.dichtel@...nd.com>
>
> But these belong in the libc headers anyways.
>
> If we haven't provided them for so long, there's no real value of
> adding them now.
>
But how can a daemon know which default values are used? If it wants to add a 
route with metric = default + x, it should first add it with metric = 0, check 
the result and then change the metric.
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