netdev - Re: How to find I/F to destination

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Message-ID: <463B2E51.90808@trash.net>
Date:	Fri, 04 May 2007 15:00:01 +0200
From:	Patrick McHardy <kaber@...sh.net>
To:	David Howells <dhowells@...hat.com>
CC:	netdev@...r.kernel.org
Subject: Re: How to find I/F to destination

David Howells wrote:
> I would like to determine through which interface packets sent to a particular
> UDP destination will go through, and so determine the MTU size for that
> interface.  Can anyone suggest a good way of doing this from within the
> kernel?

Do a route lookup (ip_route_output_key), then either use dst_mtu to get
the PMTU value or dst->dev in case you really want the device's MTU.
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