[patch] ICMP unreach, frag needed but df set + ro mtu broken

Hi,

while looking at an entirely different problems I found that icmp
unreach, frag needed but df set does not take into account any route
mtu in ip_forward breaking pmtu.

I put a patch here:
http://sources.zabbadoz.net/freebsd/patchset/patch-20071228-02-ip-forward-unreach-needfrag-ro.diff

Testing and review welcome.


PS: After a quick glance I think ip_fastfwd should be ok.

--
Bjoern A. Zeeb bzeeb at Zabbadoz dot NeT
Software is harder than hardware so better get it right the first time.
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