freebsd_wlan/net80211/ieee80211_scan.c

56 #define	ISCAN_CANCEL	0x0004		/* cancel current scan */
57 #define	ISCAN_ABORT	0x0008		/* end the scan immediately */
59 	unsigned long	ss_scanend;		/* time scan must stop */
60 	u_int		ss_duration;		/* duration for next scan */
61 	struct task	ss_scan_task;		/* scan execution */
62 	struct cv	ss_scan_cv;		/* scan signal */
63 	struct callout	ss_scan_timer;		/* scan timer */
69  * scan.  This value should be large enough to catch most
112 	cv_init(&ss->ss_scan_cv, "scan");
138 		    ("scan still running"));
236 	const struct ieee80211_scanner *scan)
240 	scanners[mode] = scan;
245 	const struct ieee80211_scanner *scan)
249 	if (scanners[mode] == scan)
254 ieee80211_scanner_unregister_all(const struct ieee80211_scanner *scan)
259 		if (scanners[m] == scan)
273 	const struct ieee80211_scanner *scan)
281 	if (ss->ss_vap != vap || ss->ss_ops != scan) {
294 	if (ss->ss_ops != scan) {
297 		 * case where a single scan module implements multiple
298 		 * policies by using different scan ops but a common
303 		if (scan == NULL || ss->ss_ops == NULL ||
304 		    ss->ss_ops->scan_attach != scan->scan_attach) {
307 			if (scan != NULL && !scan->scan_attach(ss)) {
310 				scan = NULL;
313 		ss->ss_ops = scan;
360 	if_printf(vap->iv_ifp, "scan set ");
383  * Start a scan unless one is already going.
386 start_scan_locked(const struct ieee80211_scanner *scan,
398 		    "%s: scan inhibited by pending channel change\n", __func__);
401 		    "%s: %s scan, duration %u mindwell %u maxdwell %u, desired mode %s, %s%s%s%s%s%s\n"
414 		scan_update_locked(vap, scan);
436 			/* NB: scan_start must be before the scan runtask */
448 		    "%s: %s scan already in progress\n", __func__,
455  * Start a scan unless one is already going.
463 	const struct ieee80211_scanner *scan;
466 	scan = ieee80211_scanner_get(vap->iv_opmode);
467 	if (scan == NULL) {
476 	result = start_scan_locked(scan, vap, flags, duration,
484  * Check the scan cache for an ap/channel to use; if that
485  * fails then kick off a new scan.
494 	const struct ieee80211_scanner *scan;
497 	scan = ieee80211_scanner_get(vap->iv_opmode);
498 	if (scan == NULL) {
507 	 * Check if there's a list of scan candidates already.
513 	    "%s: %s scan, %s%s%s%s%s\n"
523 	if (ss->ss_ops != scan) {
527 	scan_update_locked(vap, scan);
545 			 * something is already in the scan cache we can
565 	result = start_scan_locked(scan, vap, flags, duration,
573  * Check the scan cache for an ap/channel to use; if that fails
574  * then kick off a scan using the current settings.
586  * Restart a previous scan.  If the previous scan completed
594 	const struct ieee80211_scanner *scan;
596 	scan = ieee80211_scanner_get(vap->iv_opmode);
597 	if (scan == NULL) {
617 		    "%s: %s scan, ticks %u duration %lu\n", __func__,
621 		scan_update_locked(vap, scan);
625 			 * A background scan does not select a new sta; it
626 			 * just refreshes the scan cache.  Also, indicate
627 			 * the scan logic should follow the beacon schedule:
628 			 * we go off-channel and scan for a while, then
632 			 * the scan is complete we leave power save mode.
635 			 * (and background scan) automatically by way of the
642 			/* if previous scan completed, restart */
649 				 * NB: beware of the scan cache being flushed;
676 		    "%s: %s scan already in progress\n", __func__,
686  * Cancel any scan currently going on for the specified vap.
699 		    "%s: cancel %s scan\n", __func__,
703 		/* clear bg scan NOPICK and mark cancel request */
706 		/* wake up the scan task */
713  * Cancel any scan currently going on.
725 		    "%s: cancel %s scan\n", __func__,
729 		/* clear bg scan NOPICK and mark cancel request */
732 		/* wake up the scan task */
748 	/* wake up the scan task */
755  * Public access to scan_next for drivers that are not able to scan single
808  * Scan curchan.  If this is an active scan and the channel
869 			"%s: no channels to scan\n", __func__);
906 		 * Watch for truncation due to the scan end time.
931 		 * Perform the channel change and scan unlocked so the driver
946 		 * prepare/initiate the hardware for the scan (if at all), the
960 		/* Wait to be signalled to scan the next channel */
971 	 * Record scan complete time.  Note that we also do
972 	 * this when canceled so any background scan will
991 	 * If not canceled and scan completed, do post-processing.
994 	 * notify the driver to end the scan above to avoid having
995 	 * rx frames alter the scan candidate list.
1036 	 * Drop out of power save mode when a scan has
1037 	 * completed.  If this scan was prematurely terminated
1038 	 * because it is a background scan then don't notify
1121 	 * using scan state setup on the initial entry to the timer
1157  * Timeout/age scan cache entries; called from sta timeout
1170  * Mark a scan cache entry after a successful associate.
1185  * Demerit a scan cache entry after failing to associate.
1201  * Iterate over the contents of the scan cache.
1214  * Flush the contents of the scan cache.
1228  * Check the scan cache for an ap/channel to use; if that
1229  * fails then kick off a new scan.
1244 		    "%s: scan module does not support picking a channel, "