U32 classifier

modulename: cls_u32.ko

configname: CONFIG_NET_CLS_U32

Linux Kernel Configuration
└─>Networking support
└─>Networking options
└─>QoS and/or fair queueing
└─>U32 classifier
In linux kernel since version 2.6.12  
If you say Y here, you will be able to classify outgoing packets
according to their destination address. If unsure, say Y.

To compile this code as a module, choose M here: the
module will be called cls_u32.

source code: