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DFS: Handle pre-CAC expired event

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As FCC DFS requirement does not explicitly mention about the validity of
the (pre-)CAC when channel is switched, it is safe to assume that the
pre-CAC result will not be valid once the CAC completed channel is
switched or radar detection is not active on the (CAC completed) channel
within a time period which is allowed (10 seconds - channel switch time)
as per FCC DFS requirement.

Use the new driver event to allow the driver to notify expiry of the CAC
result on a channel. Move the DFS state of the channel to 'usable' when
processing pre-CAC expired event.  This means any future operation on
that channel will require a new CAC to be completed. This event is
applicable only when DFS is not offloaded to the kernel driver.

Signed-off-by: Vasanthakumar Thiagarajan <vthiagar@qti.qualcomm.com>
This commit is contained in:
Vasanthakumar Thiagarajan 2017-03-08 10:43:17 +05:30 • committed by Jouni Malinen
parent 62c8c7f721
commit 7cbb5f1a44
4 changed files with 40 additions and 2 deletions
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5
src/ap/dfs.h
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@ -1,7 +1,7 @@
/*
* DFS - Dynamic Frequency Selection
* Copyright (c) 2002-2013, Jouni Malinen <j@w1.fi>
* Copyright (c) 2013, Qualcomm Atheros, Inc.
* Copyright (c) 2013-2017, Qualcomm Atheros, Inc.
*
* This software may be distributed under the terms of the BSD license.
* See README for more details.
@ -14,6 +14,9 @@ int hostapd_handle_dfs(struct hostapd_iface *iface);
int hostapd_dfs_complete_cac(struct hostapd_iface *iface, int success, int freq,
int ht_enabled, int chan_offset, int chan_width,
int cf1, int cf2);
int hostapd_dfs_pre_cac_expired(struct hostapd_iface *iface, int freq,
int ht_enabled, int chan_offset, int chan_width,
int cf1, int cf2);
int hostapd_dfs_radar_detected(struct hostapd_iface *iface, int freq,
int ht_enabled,
int chan_offset, int chan_width,