about proxy

[carl.huang [?建?] <carl.huang@xxxxxxxxxx>]

dear all:

Does anyone know some open-source used in linux kernel based on ip
to content-based load balance.  

 I think to implement content-based load balance will need a proxy
  that finish tcp connection from user to load balancer and then get
 the request content and then choose a real server according the
 rule defined and then finish tcp connection from load balancer to 
real server and then distribute the request to real server.

Is there any GPL software package ?

Regards,
Carl