How to install Hostapd v2.3 devel + Disable bss neighbor check/force 40 MHz channels

[Nick_the_Greek]

The following procedure is a part of
Aerial - How to E-Z Setup a Multi-mode wireless LAN Based on a Software Access point

Let's install the dependencies:

apt-get install -y linux-headers-"`uname -r`" build-essential
apt-get install -y libnl-3-dev libssl-dev libssl1.0.0

Create lbnl-3 symbolic links:

For Kali Linux i386 (x32):

ln -s /usr/include/libnl3/netlink/ /usr/include/
ln -s /lib/"`dpkg --print-architecture`"-linux-gnu/libnl-3.so.200.5.2 /lib/"`dpkg --print-architecture`"-linux-gnu/libnl.so
ln -s /lib/"`dpkg --print-architecture`"-linux-gnu/libnl-genl-3.so.200.5.2 /lib/"`dpkg --print-architecture`"-linux-gnu/libnl-genl.so
ln -s /lib/"`dpkg --print-architecture`"-linux-gnu/libnl-genl-3.so.200.5.2 /lib/"`dpkg --print-architecture`"-linux-gnu/libnl-genl-3.so

For Kali Linux amd64 (x64):

ln -s /usr/include/libnl3/netlink/ /usr/include/
ln -s /lib/"`uname -m`"-linux-gnu/libnl-3.so.200.5.2 /lib/"`uname -m`"-linux-gnu/libnl.so
ln -s /lib/"`uname -m`"-linux-gnu/libnl-genl-3.so.200.5.2 /lib/"`uname -m`"-linux-gnu/libnl-genl.so
ln -s /lib/"`uname -m`"-linux-gnu/libnl-genl-3.so.200.5.2 /lib/"`uname -m`"-linux-gnu/libnl-genl-3.so

Download latest hostapd:

export HOME_DIR="/root"
cd $HOME_DIR
git clone git://w1.fi/srv/git/hostap.git

Let's configure hostapd's configuration file:
# Set to yes: CONFIG_DRIVER_HOSTAP, CONFIG_DRIVER_NL80211, CONFIG_LIBNL32, CONFIG_IEEE80211N, CONFIG_IEEE80211AC, CONFIG_ACS
# Use openssl libraries
# Enable: WPS and UPnP support for external WPS Registrars

sed 's%#CONFIG_DRIVER_HOSTAP=y%CONFIG_DRIVER_HOSTAP=y%g' $HOME_DIR/hostap/hostapd/defconfig > $HOME_DIR/hostap/hostapd/defconfig1 && mv $HOME_DIR/hostap/hostapd/defconfig1 $HOME_DIR/hostap/hostapd/defconfig
sed 's%#CONFIG_DRIVER_NL80211=y%CONFIG_DRIVER_NL80211=y%g' $HOME_DIR/hostap/hostapd/defconfig > $HOME_DIR/hostap/hostapd/defconfig1 && mv $HOME_DIR/hostap/hostapd/defconfig1 $HOME_DIR/hostap/hostapd/defconfig
sed 's%#CONFIG_LIBNL32=y%CONFIG_LIBNL32=y%g' $HOME_DIR/hostap/hostapd/defconfig > $HOME_DIR/hostap/hostapd/defconfig1 && mv $HOME_DIR/hostap/hostapd/defconfig1 $HOME_DIR/hostap/hostapd/defconfig
sed 's%#CONFIG_IEEE80211N=y%CONFIG_IEEE80211N=y%g' $HOME_DIR/hostap/hostapd/defconfig > $HOME_DIR/hostap/hostapd/defconfig1 && mv $HOME_DIR/hostap/hostapd/defconfig1 $HOME_DIR/hostap/hostapd/defconfig
sed 's%#CONFIG_IEEE80211AC=y%CONFIG_IEEE80211AC=y%g' $HOME_DIR/hostap/hostapd/defconfig > $HOME_DIR/hostap/hostapd/defconfig1 && mv $HOME_DIR/hostap/hostapd/defconfig1 $HOME_DIR/hostap/hostapd/defconfig
sed 's%#CONFIG_ACS=y%CONFIG_ACS=y%g' $HOME_DIR/hostap/hostapd/defconfig > $HOME_DIR/hostap/hostapd/defconfig1 && mv $HOME_DIR/hostap/hostapd/defconfig1 $HOME_DIR/hostap/hostapd/defconfig
sed 's%#CONFIG_TLS=openssl%CONFIG_TLS=openssl%g' $HOME_DIR/hostap/hostapd/defconfig > $HOME_DIR/hostap/hostapd/defconfig1 && mv $HOME_DIR/hostap/hostapd/defconfig1 $HOME_DIR/hostap/hostapd/defconfig
sed 's%#CONFIG_WPS=y%CONFIG_WPS=y%g' $HOME_DIR/hostap/hostapd/defconfig > $HOME_DIR/hostap/hostapd/defconfig1 && mv $HOME_DIR/hostap/hostapd/defconfig1 $HOME_DIR/hostap/hostapd/defconfig
sed 's%#CONFIG_WPS_UPNP=y%CONFIG_WPS_UPNP=y%g' $HOME_DIR/hostap/hostapd/defconfig > $HOME_DIR/hostap/hostapd/defconfig1 && mv $HOME_DIR/hostap/hostapd/defconfig1 $HOME_DIR/hostap/hostapd/defconfig

Enable configuration file:

cp $HOME_DIR/hostap/hostapd/defconfig $HOME_DIR/hostap/hostapd/.config

Let's patch hostapd to Disable bss neighbor check and force 40 MHz channels width.
For detailed description about this patch please read this paragraph (1):
Aerial - How to E-Z Setup a Multi-mode wireless LAN Based on a Software Access point - Part 2
Open /root/hostap/src/ap/hw_features.c

nano /root/hostap/src/ap/hw_features.c

goto line 542 and change this:

iface->conf->channel,
iface->conf->channel +
iface->conf->secondary_channel * 4);
iface->conf->secondary_channel = 0;
if (iface->drv_flags & WPA_DRIVER_FLAGS_HT_2040_COEX) {
/*
* TODO: Could consider scheduling another scan to check

to this:

iface->conf->channel,
iface->conf->channel +
iface->conf->secondary_channel * 4);
/* iface->conf->secondary_channel = 0; */
if (iface->drv_flags & WPA_DRIVER_FLAGS_HT_2040_COEX) {
/*
* TODO: Could consider scheduling another scan to check

Let's compile and install:

make clean
make
make install

That's it! You're done. You have Hostapd v.2.3 devel compiled with nl80211 driver, IEEE80211N enabled, IEEE80211AC enabled, ACS enabled and WPS and UPnP enabled.

Please have in mind that if you want to use a wireless interface with hostapd you must first exclude that interface from controlling by network manager. To do e.g. wireless interface wlan0
Add a line to /etc/network/interfaces file

iface wlan0 inet manual

and stop and start networking and network manager

service network-manager stop
service networking stop
service networking start
service network-manager start

To undo that remove that line and redo the stop/start commands.

Enjoy!

Nick_the_Greek