netdev - How to find I/F to destination

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Message-ID: <5484.1178282928@redhat.com>
Date:	Fri, 04 May 2007 13:48:48 +0100
From:	David Howells <dhowells@...hat.com>
To:	netdev@...r.kernel.org
cc:	Patrick McHardy <kaber@...sh.net>
Subject: How to find I/F to destination

Hi,

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?

Doing this will permit AF_RXRPC to obtain a better initial guess as to the
maximum size of the packets that can be sent that way.

I could use the code Patrick gave me to allow AFS to iterate through all the
interfaces and then pick the smallest MTU, but that seems wrong somehow -
though it probably will result in the correct answer 99% of the time.

David
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