From mboxrd@z Thu Jan  1 00:00:00 1970
From: Eric Dumazet <eric.dumazet@gmail.com>
Subject: Re: [PATCH 5/5] ipv4: Add FIB nexthop exceptions.
Date: Tue, 17 Jul 2012 16:00:05 +0200
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References: <20120717.061435.1733209287175819043.davem@davemloft.net>
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To: David Miller <davem@davemloft.net>
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On Tue, 2012-07-17 at 06:14 -0700, David Miller wrote:
> In a regime where we have subnetted route entries, we need a way to
> store persistent storage about destination specific learned values
> such as redirects and PMTU values.
> 
> This is implemented here via nexthop exceptions.
> 
> The initial implementation is a simple linked list, and can be
> expanded to a hash table when it is shown to be justified.

Say a typical host uses a single default route, I am trying to convince
myself it can really use a simple linked list ?

Arent PMTU entries added by messages coming from untrusted sources ?