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authorJouni Malinen <j@w1.fi>2014-01-02 21:03:31 (GMT)
committerJouni Malinen <j@w1.fi>2014-01-02 21:03:31 (GMT)
commit949938aadf54735f29c340caf667e7505840b3c7 (patch)
treeaacfeedfced0f7ba25e0af3578ab4a499264c673 /wpa_supplicant
parenta1a31b6c3f9f87f87e232a819065042c85092726 (diff)
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Ask driver to report only new scan results if requested
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>
Diffstat (limited to 'wpa_supplicant')
-rw-r--r--wpa_supplicant/bss.c2
-rw-r--r--wpa_supplicant/ctrl_iface.c5
-rw-r--r--wpa_supplicant/scan.c7
-rw-r--r--wpa_supplicant/wpa_supplicant_i.h2
4 files changed, 16 insertions, 0 deletions
diff --git a/wpa_supplicant/bss.c b/wpa_supplicant/bss.c
index 033384c..9ea6903 100644
--- a/wpa_supplicant/bss.c
+++ b/wpa_supplicant/bss.c
@@ -820,6 +820,8 @@ void wpa_bss_flush(struct wpa_supplicant *wpa_s)
{
struct wpa_bss *bss, *n;
+ wpa_s->clear_driver_scan_cache = 1;
+
if (wpa_s->bss.next == NULL)
return; /* BSS table not yet initialized */
diff --git a/wpa_supplicant/ctrl_iface.c b/wpa_supplicant/ctrl_iface.c
index 7d7576f..03b5e17 100644
--- a/wpa_supplicant/ctrl_iface.c
+++ b/wpa_supplicant/ctrl_iface.c
@@ -5278,6 +5278,7 @@ static void wpas_ctrl_scan(struct wpa_supplicant *wpa_s, char *params,
wpa_s->manual_scan_passive = 0;
wpa_s->manual_scan_use_id = 0;
+ wpa_s->manual_scan_only_new = 0;
if (params) {
if (os_strncasecmp(params, "TYPE=ONLY", 9) == 0)
@@ -5296,6 +5297,10 @@ static void wpas_ctrl_scan(struct wpa_supplicant *wpa_s, char *params,
pos = os_strstr(params, "use_id=");
if (pos)
wpa_s->manual_scan_use_id = atoi(pos + 7);
+
+ pos = os_strstr(params, "only_new=1");
+ if (pos)
+ wpa_s->manual_scan_only_new = 1;
} else {
os_free(wpa_s->manual_scan_freqs);
wpa_s->manual_scan_freqs = NULL;
diff --git a/wpa_supplicant/scan.c b/wpa_supplicant/scan.c
index 34c430f..167ab9d 100644
--- a/wpa_supplicant/scan.c
+++ b/wpa_supplicant/scan.c
@@ -155,6 +155,8 @@ int wpa_supplicant_trigger_scan(struct wpa_supplicant *wpa_s,
wpa_supplicant_notify_scanning(wpa_s, 1);
+ if (wpa_s->clear_driver_scan_cache)
+ params->only_new_results = 1;
ret = wpa_drv_scan(wpa_s, params);
if (ret) {
wpa_supplicant_notify_scanning(wpa_s, 0);
@@ -164,6 +166,7 @@ int wpa_supplicant_trigger_scan(struct wpa_supplicant *wpa_s,
wpa_s->scan_runs++;
wpa_s->normal_scans++;
wpa_s->own_scan_requested = 1;
+ params->only_new_results = 0;
}
return ret;
@@ -727,6 +730,10 @@ ssid_list_set:
wpa_supplicant_optimize_freqs(wpa_s, &params);
extra_ie = wpa_supplicant_extra_ies(wpa_s);
+ if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
+ wpa_s->manual_scan_only_new)
+ params.only_new_results = 1;
+
if (wpa_s->last_scan_req == MANUAL_SCAN_REQ && params.freqs == NULL &&
wpa_s->manual_scan_freqs) {
wpa_dbg(wpa_s, MSG_DEBUG, "Limit manual scan to specified channels");
diff --git a/wpa_supplicant/wpa_supplicant_i.h b/wpa_supplicant/wpa_supplicant_i.h
index 2e3f244..8563b18 100644
--- a/wpa_supplicant/wpa_supplicant_i.h
+++ b/wpa_supplicant/wpa_supplicant_i.h
@@ -484,9 +484,11 @@ struct wpa_supplicant {
int *manual_scan_freqs;
unsigned int manual_scan_passive:1;
unsigned int manual_scan_use_id:1;
+ unsigned int manual_scan_only_new:1;
unsigned int own_scan_requested:1;
unsigned int own_scan_running:1;
unsigned int external_scan_running:1;
+ unsigned int clear_driver_scan_cache:1;
unsigned int manual_scan_id;
int scan_interval; /* time in sec between scans to find suitable AP */
int normal_scans; /* normal scans run before sched_scan */