Initialize variables explicitly to avoid [-Wmaybeuninitialized] compiler
warning in hostapd_handle_dfs() and
hostapd_dfs_start_channel_switch_cac() functions.
Signed-hostap: Max Stepanov <Max.Stepanov@intel.com>
Until now DFS was simply restarting the AP when radar was detected. Now
CSA is used to perform smooth switch to the new channel. Stations not
supporting CSA will behave as before.
Signed-hostap: Janusz Dziedzic <janusz.dziedzic@tieto.com>
Signed-hostap: Michal Kazior <michal.kazior@tieto.com>
This is needed for AP CSA. Since CSA must happen immediately after radar
is detected there's no time to perform CAC. Thus, radar channels must be
disabled when looking for a new channel to escape to after a radar is
detected.
Signed-hostap: Michal Kazior <michal.kazior@tieto.com>
NL80211_ATTR_CENTER_FREQ1 is defined to be used for anything but 20 MHz
bandwidth, so it could be unset for 20 MHz channels. Do not use it to
override center frequency from NL80211_ATTR_WIPHY_FREQ (if available)
for 20 MHz channels to avoid clearing frequency.
Signed-hostap: Jouni Malinen <j@w1.fi>
DFS operations are specific to the interface (radio/wiphy), not BSS
(netdev/vif), so hostapd_iface is the appropriate element to use in
them.
Signed-hostap: Jouni Malinen <j@w1.fi>
If radar was detected single BSS is notified about it. This caused only
that single BSS to be stopped and restarted. However, due to nl80211
interface combinations the BSS was not started on a new channel and
other BSSes remained operating on the old channel.
The downside is that hostapd_disable_iface() causes deauth frames to be
sent. This is undesired but on the other hand it doesn't make sense to
create workarounds that imitate CSA's 'block tx'. For proper Tx
quiescing CSA should be properly implemented.
Signed-off-by: Michal Kazior <michal.kazior@tieto.com>
Decouple HT/VHT offset/center-freq calculations from channel lookup.
This will be necessary for further improvements on the DFS codebase.
Signed-hostap: Michal Kazior <michal.kazior@tieto.com>
When we have CAC active and receive a radar event, we should ignore
CAC_ABORT event and handle channel switch in the radar event handler.
Signed-hostap: Janusz Dziedzic <janusz.dziedzic@tieto.com>
This fixes a problem when operating on non-DFS channel and receiving a
radar event for that channel. Previously, we would have decided to
switch channels.
Signed-hostap: Janusz Dziedzic <janusz.dziedzic@tieto.com>
Add a table of available VHT80 channels. This table contains the first
available channel. We will also choose this first channel as the control
one.
Signed-hostap: Janusz Dziedzic <janusz.dziedzic@tieto.com>
The VHT_CHANWIDTH_160MHZ case fell through to the default case and
printed out a debug message that was not supposed to be shown here.
Signed-hostap: Jouni Malinen <j@w1.fi>
Add DFS structures/events handlers, CAC handling, and radar detection.
By default, after radar is detected or the channel became unavailable, a
random channel will be chosen.
This patches are based on the original work by Boris Presman and
Victor Goldenshtein. Most of the DFS code is moved to a new dfs.c/dfs.h
files.
Cc: Boris Presman <boris.presman@ti.com>
Cc: Victor Goldenshtein <victorg@ti.com>
Signed-hostap: Simon Wunderlich <siwu@hrz.tu-chemnitz.de>
Signed-hostap: Janusz Dziedzic <janusz.dziedzic@tieto.com>
