Splitting wireless traffic

I would like to setup rules so that wireless traffic is split between two 
interfaces to increase capacity.  I have a network with two wireless cards 
per device with all interfaces part of the same bridge group.  I'd like all 
traffic headed to the network to be sent on wlan0, while all traffic headed 
to the router to be sent on wlan3.

               router
                 |
                 |
  ------------- eth0 ----------------
  |                                 |
wlan0       upstream device      wlan1
  |                                 ^
  |                                 |
  V   ==========================    ^
  |                                 |
  V                                 |
wlan2      downstream device     wlan3
  |                                 |
  ------------- eth0 ----------------
                 |
                 |
              network

I fiddled a few rules for a bit, but this got beyond my abilities.  Any help 
would be appreciated.

Thanks,
Hampton


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