6lowpan support over IEEE 802.15.4

modulename: ieee802154_6lowpan.ko

and/or

6lowpan.ko

configname: CONFIG_IEEE802154_6LOWPAN

Linux Kernel Configuration
└─>Networking support
└─>Networking options
└─>The IPv6 protocol
└─>6lowpan support over IEEE 802.15.4
In linux kernel since version 3.1 (release Date: 2011-10-24)  
IPv6 compression over IEEE 802.15.4.

source code:
net/ieee802154/6lowpan.c