Port forwarding question

Hey all-

I've got a very specific port forwarding setup I'd like to implement, 
but I can't seem to find the exact syntax to do it.  I'm on OpenSolaris.

What I want to do is achieved by NAT I think.  I need a rule such that:

If a TCP packet comes in with a SOURCE IP of 10.1.1.1 and a DESTINATION 
port of 22

Then..

Forward it to 192.168.1.1 on port 1000

??

I see the rdr directive, but it doesn't seem to allow for specifying a 
'source' IP address and 'destination' port in packet matching portion of 
the rule, it looks like the end of the rule should be "-> 192.168.1.1 
port 1000" I think...

Quickly browsed the archives but couldn't find this, nor could I find an 
example in the documentation...  Any hints?

Thanks!