Wireless extensions

modulename: wext.ko

configname: CONFIG_WIRELESS_EXT

Linux Kernel Configuration
└─>Networking support
└─>Wireless
└─>Wireless extensions
In linux kernel since version 2.6.17 (release Date: 2006-06-17)  
This option enables the legacy wireless extensions
(wireless network interface configuration via ioctls.)

Say Y unless you've upgraded all your userspace to use
nl80211 instead of wireless extensions.

source code:
net/wireless/wext.c