Re: [RFC PATCH 3/3] xfrm4: Invalidate all ipv4 routes on IPsec pmtu events

On Fri, Jan 18, 2013 at 02:39:23PM -0500, David Miller wrote:

From: Steffen Klassert <steffen.klassert@secunet.com>
Date: Fri, 18 Jan 2013 09:16:01 +0100

quoted

On IPsec pmtu events we can't access the transport headers of
the original packet, so we can't find the socket that sent
the packet. The only chance to notify the socket about the
pmtu change is to force a relookup for all routes. This
patch implenents this for the IPsec protocols.

Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>

Expensive, but I really can't come up with a better idea.

Yes, it's a last resort fix. But pmtu events are rare, so
it should not harm too much.