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Date: Tue, 05 Jun 2007 09:59:52 +0300
From: Artis Caune <Artis.Caune@latnet.lv>
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Subject: PFIL hooks
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I want to monitor pf tagged mbufs, but (without kld hacks) I can see 
only IN or OUT direction, because PFIL insert hooks in reverse order.

Hack like this works, but is ugly:
# kldload mymodule
# mymodule -enable PFIL_OUT
# kldload pf
# pfctl -e
# mymodule -enable PFIL_IN


How about PFIL_HEAD, PFIL_TAIL flags for pfil_add_hook?



pfil_list_add()
...
if (flags & PFIL_IN) {
   if (flags & PFIL_TAIL)
     TAILQ_INSERT_TAIL(list, pfh1, pfil_link);
   else
     TAILQ_INSERT_HEAD(list, pfh1, pfil_link);
} else {
   if (flags & PFIL_HEAD)
     TAILQ_INSERT_HEAD(list, pfh1, pfil_link);
   else
     TAILQ_INSERT_TAIL(list, pfh1, pfil_link);
}