netdev - Re: [PATCH] IPv6: fix rt_lookup in pmtu

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Message-Id: <20100107.012701.257511338.davem@davemloft.net>
Date:	Thu, 07 Jan 2010 01:27:01 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	therbert@...gle.com
Cc:	netdev@...r.kernel.org, lorenzo@...gle.com
Subject: Re: [PATCH] IPv6: fix rt_lookup in pmtu_discovery

From: Tom Herbert <therbert@...gle.com>
Date: Wed, 6 Jan 2010 20:43:48 -0800

> In rt6_pmtu_discovery a route lookup is done constrained to the
> receiving interface of the ICMP message.  In the case of an asymmetric
> routing, the receive interface may be different than the sending
> interface, so no route will be found in such cases and pmtu is never
> correctly set in the route to the destination.  This patch fixes that
> by not using the receive interface in the lookup.
> 
> Signed-off-by: Tom Herbert <therbert@...gle.com>

This needs to do what the IPV4 side does, iterate over specific then
"any" device index, doing a lookup for each case until the route is
found, therefore starting from more specific and going towards less
specific routes.
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