[squid-users] IP-to-Country csv file and conditionnal relay.

Hi,

After have googled a lot concerning my issue, I'm coming here.

I'm using two servers, one is a transparent proxy, sitting in office in
China. The other one is in another asian country.
I have set up and ssh tunnel between the two computers in order to
connect the two proxies in a secured way.

What I have set up presently is :

---
cache_peer localhost parent 8028 7 no-query default
---
Where the 8028 is binded with the 3128 port on the remote proxy.
My problem is that users in office can' t access to web sites in China 
with good speed. I want to find a way to enable the relaying only if the 
ip of the visited web site is not located in China.
And I didn't figure out any way to do this.
Somebody might help ?