ipfw count equivalent?

[Patrick Gibson <openbsd_list_(_at_)_patrickg_(_dot_)_com>]

Hi OpenBSDers,

I searched through the archives, but could not find an answer to my 
question, so here goes:

On our FreeBSD servers, we have several rules like:

ipfw add count ip from any to x.x.x.x
ipfw add count ip from x.x.x.x to any

... to keep track of how much traffic is going through a particular IP 
address. Every night, I capture the data and zero the counters. We've 
had an OpenBSD box around for a while now, but I haven't had too much 
time to play with it until now. (Just upgraded from 3.4 to 3.6 -- the 
easiest remote upgrade I ever did do!)

At any rate, I'd like to add some similar rules on this OpenBSD 3.6 
machine so I can keep track of the data flowing through this machine 
too. I've gone through the pf man pages, but I don't really see 
anything that would let me setup a similar ruleset (my guess is I'm 
looking for the wrong thing).

So, in short, I'd like to know what kind of ruleset I would need to 
create just to have counters like this, and then of course, what 
program do I use to output and zero the counters?

Thanks so much,

Patrick