modulename: act_api.ko

configname: CONFIG_NET_CLS_ACT

Linux Kernel Configuration
└─>Networking support
└─>Networking options
└─>QoS and/or fair queueing
In linux kernel since version 2.6.12  
Say Y here if you want to use traffic control actions. Actions
get attached to classifiers and are invoked after a successful
classification. They are used to overwrite the classification
result, instantly drop or redirect packets, etc.

A recent version of the iproute2 package is required to use
extended matches.

source code: