IP tunnel metadata manipulation

modulename: act_tunnel_key.ko

configname: CONFIG_NET_ACT_TUNNEL_KEY

Linux Kernel Configuration
└─>Networking support
└─>Networking options
└─>QoS and/or fair queueing
└─>IP tunnel metadata manipulation
In linux kernel since version 4.1 (release Date: 2015-06-21)  
Say Y here to set/release ip tunnel metadata.

If unsure, say N.

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

source code: