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Ask driver to report only new scan results if requested

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If the BSS table within wpa_supplicant is flushed, request the driver to
flush its own scan result table during the next scan. This can avoid
unexpected old BSS entries showing up after BSS_FLUSH or FLUSH command
in cases where the driver may maintain its internal cache of scan
results (e.g., cfg80211 BSS table persists at least for 15 seconds).

In addition to doing this automatically on BSS_FLUSH/FLUSH, a new SCAN
command argument, only_new=1, can be used to request a manual scan
request to do same. Though, it should be noted that this maintains the
BSS table within wpa_supplicant. BSS_FLUSH followed by SCAN command can
be used to clear all BSS entries from both the driver and
wpa_supplicant.

Signed-hostap: Jouni Malinen <j@w1.fi>
This commit is contained in:
Jouni Malinen 2014-01-02 23:03:31 +02:00
parent a1a31b6c3f
commit 949938aadf
6 changed files with 31 additions and 0 deletions
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9
src/drivers/driver.h
View file

@ -340,6 +340,15 @@ struct wpa_driver_scan_params {
* and not to transmit the frames at any of those rates.
*/
u8 p2p_probe;
/**
* only_new_results - Request driver to report only new results
*
* This is used to request the driver to report only BSSes that have
* been detected after this scan request has been started, i.e., to
* flush old cached BSS entries.
*/
int only_new_results;
};
/**

6
src/drivers/driver_nl80211.c
View file

@ -4679,6 +4679,12 @@ nl80211_scan_common(struct wpa_driver_nl80211_data *drv, u8 cmd,
params->filter_ssids = NULL;
drv->num_filter_ssids = params->num_filter_ssids;
if (params->only_new_results) {
wpa_printf(MSG_DEBUG, "nl80211: Add NL80211_SCAN_FLAG_FLUSH");
NLA_PUT_U32(msg, NL80211_ATTR_SCAN_FLAGS,
NL80211_SCAN_FLAG_FLUSH);
}
return msg;
fail: