Filtering rule based on dynamic route

Hi all.

I need to set up some filtering rule on netfilter/iptables based on
dynamic route.
the dynamics route information are given to the routers using OSPF.

How could I read these route from the linux machine ? (which is just a
firewall)
could I allow these route directly from OSPF in iptables ?

thanks for your pointers.
best regards.
--
d

ok ,
for the first problem, I think a filtering on protocol 89 will do the
job.

for the second problem I think I have to deal with the ospfd deamon
from quagga(Zebra).

Does one of you know how difficult it is to use ospfd with no
interaction,
I mean, just to read the routes.

thank for your time.
--
d