they are using the driver from netgear
Code:
This driver was extracted out of the GPL source package for NETGEAR WNDR4500
It contains the Broadcom wireless driver 5.100.138
This driver includes firmware version 666.2
http://www.downloads.netgear.com/files/GPL/WNDR4500-V1.0.0.40_1.0.10_src.tar.zip
WNDR4500-V1.0.0.40_1.0.10_src/src/wl
RT-N66U TomatoUSB 1.28.0000 MIPSR2-135 K26AC USB AIO-64K running Entware-NG
pyload 0.4.9
minidlna 1.1.2
samba 3.6.5
openvpn 2.3.10
̶W̶L̶5̶0̶0̶g̶P̶ ̶1̶.̶9̶.̶2̶.̶7̶-̶r̶t̶n̶-̶r̶4̶7̶5̶0 retired