Netfilter mark (FW)

modulename: cls_fw.ko

configname: CONFIG_NET_CLS_FW

Linux Kernel Configuration
└─>Networking support
└─>Networking options
└─>QoS and/or fair queueing
└─>Netfilter mark (FW)
In linux kernel since version 2.6.12  
If you say Y here, you will be able to classify packets
according to netfilter/firewall marks.

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

source code: