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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
Download patch file Download diff file Expand all files Collapse all files

15
src/ap/drv_callbacks.c
View file

@ -1121,6 +1121,16 @@ static void hostapd_event_dfs_radar_detected(struct hostapd_data *hapd,
}
static void hostapd_event_dfs_pre_cac_expired(struct hostapd_data *hapd,
struct dfs_event *radar)
{
wpa_printf(MSG_DEBUG, "DFS Pre-CAC expired on %d MHz", radar->freq);
hostapd_dfs_pre_cac_expired(hapd->iface, radar->freq, radar->ht_enabled,
radar->chan_offset, radar->chan_width,
radar->cf1, radar->cf2);
}
static void hostapd_event_dfs_cac_finished(struct hostapd_data *hapd,
struct dfs_event *radar)
{
@ -1313,6 +1323,11 @@ void wpa_supplicant_event(void *ctx, enum wpa_event_type event,
break;
hostapd_event_dfs_radar_detected(hapd, &data->dfs_event);
break;
case EVENT_DFS_PRE_CAC_EXPIRED:
if (!data)
break;
hostapd_event_dfs_pre_cac_expired(hapd, &data->dfs_event);
break;
case EVENT_DFS_CAC_FINISHED:
if (!data)
break;