CONFIG_XFRM_IPCOMP (not configurable)

modulename: xfrm_ipcomp.ko

configname: CONFIG_XFRM_IPCOMP

Linux Kernel Configuration
└─>Networking support
└─>Networking options
└─>XFRM_IPCOMP
In linux kernel since version 2.6.27 (release Date: 2008-10-09)  
source code:
net/xfrm/xfrm_ipcomp.c