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From help-file :

Routing tables based classifier
CONFIG_NET_CLS_ROUTE4
  If you say Y here, you will be able to classify outgoing packets
  according to the route table entry they matched. If unsure, say Y.
 
  This code is also available as a module called cls_route.o ( = code
  which can be inserted in and removed from the running kernel
  whenever you want). If you want to compile it as a module, say M
  here and read Documentation/modules.txt.