58 #define ISCAN_INTERRUPT		0x0004		/* interrupt current scan */
59 #define	ISCAN_CANCEL		0x0008		/* cancel current scan */
61 #define	ISCAN_ABORT		0x0010		/* end the scan immediately */
62 #define	ISCAN_RUNNING		0x0020		/* scan was started */
65 	unsigned long		ss_scanend;	/* time scan must stop */
66 	u_int			ss_duration;	/* duration for next scan */
67 	struct task		ss_scan_start;	/* scan start */
68 	struct timeout_task	ss_scan_curchan;  /* scan execution */
74  * scan.  This value should be large enough to catch most
92 MALLOC_DEFINE(M_80211_SCAN, "80211scan", "802.11 scan state");
105 		    ("scan still running"));  in ieee80211_swscan_detach()
128 	 * TODO: all of the vap scan calls should be methods!  in ieee80211_swscan_vattach()
160  * Start a scan unless one is already going.
163 ieee80211_swscan_start_scan_locked(const struct ieee80211_scanner *scan,  in ieee80211_swscan_start_scan_locked()  argument
175 		    "%s: scan inhibited by pending channel change\n", __func__);  in ieee80211_swscan_start_scan_locked()
178 		    "%s: %s scan, duration %u mindwell %u maxdwell %u, desired mode %s, %s%s%s%s%s%s\n"  in ieee80211_swscan_start_scan_locked()
191 		ieee80211_scan_update_locked(vap, scan);  in ieee80211_swscan_start_scan_locked()
208 			/* Set duration for this particular scan */  in ieee80211_swscan_start_scan_locked()
214 			/* NB: scan_start must be before the scan runtask */  in ieee80211_swscan_start_scan_locked()
222 			/* Start scan task */  in ieee80211_swscan_start_scan_locked()
228 		    "%s: %s scan already in progress\n", __func__,  in ieee80211_swscan_start_scan_locked()
235  * Start a scan unless one is already going.
240 ieee80211_swscan_start_scan(const struct ieee80211_scanner *scan,  in ieee80211_swscan_start_scan()  argument
251 	result = ieee80211_swscan_start_scan_locked(scan, vap, flags, duration,  in ieee80211_swscan_start_scan()
259  * Check the scan cache for an ap/channel to use; if that
260  * fails then kick off a new scan.
267 ieee80211_swscan_check_scan(const struct ieee80211_scanner *scan,  in ieee80211_swscan_check_scan()  argument
295 			 * something is already in the scan cache we can  in ieee80211_swscan_check_scan()
321 	result = ieee80211_swscan_start_scan_locked(scan, vap, flags, duration,  in ieee80211_swscan_check_scan()
328  * Restart a previous scan.  If the previous scan completed
332 ieee80211_swscan_bg_scan(const struct ieee80211_scanner *scan,  in ieee80211_swscan_bg_scan()  argument
359 		    "%s: %s scan, ticks %u duration %u\n", __func__,  in ieee80211_swscan_bg_scan()
363 		ieee80211_scan_update_locked(vap, scan);  in ieee80211_swscan_bg_scan()
367 			 * A background scan does not select a new sta; it  in ieee80211_swscan_bg_scan()
368 			 * just refreshes the scan cache.  Also, indicate  in ieee80211_swscan_bg_scan()
369 			 * the scan logic should follow the beacon schedule:  in ieee80211_swscan_bg_scan()
370 			 * we go off-channel and scan for a while, then  in ieee80211_swscan_bg_scan()
374 			 * the scan is complete we leave power save mode.  in ieee80211_swscan_bg_scan()
377 			 * (and background scan) automatically by way of the  in ieee80211_swscan_bg_scan()
384 			/* if previous scan completed, restart */  in ieee80211_swscan_bg_scan()
391 				 * NB: beware of the scan cache being flushed;  in ieee80211_swscan_bg_scan()
419 		    "%s: %s scan already in progress\n", __func__,  in ieee80211_swscan_bg_scan()
428  * Taskqueue work to cancel a scan.
430  * Note: for offload scan devices, we may want to call into the
447 		    "%s: %s %s scan\n", func,  in cancel_scan()
452 		/* clear bg scan NOPICK */  in cancel_scan()
454 		/* mark request and wake up the scan task */  in cancel_scan()
468  * Cancel any scan currently going on for the specified vap.
477  * Cancel any scan currently going on.
502 	/* wake up the scan task */  in ieee80211_swscan_scan_next()
507  * Manually stop a scan that is currently running.
508  * Provided for drivers that are not able to scan single channels
537 	 * Full-offload scan devices don't require this.  in ieee80211_swscan_probe_curchan()
562  * Scan curchan.  If this is an active scan and the channel
645 			"%s: no channels to scan\n", __func__);  in scan_start()
654 	 * those devices manage scan/traffic differently.  in scan_start()
674 	/* XXX scan state can change! Re-validate scan state! */  in scan_start()
696 	 * Note: only /end/ the scan if we're CANCEL rather than  in scan_curchan_task()
699 	 * We can stop the scan if we hit cancel, but we shouldn't  in scan_curchan_task()
700 	 * call scan_end(ss, 1) if we're just PAUSEing the scan.  in scan_curchan_task()
728 	 * Watch for truncation due to the scan end time.  in scan_curchan_task()
754 	 * Perform the channel change and scan unlocked so the driver  in scan_curchan_task()
762 	 * Scan curchan.  Drivers for "intelligent hardware"  in scan_curchan_task()
769 	 * prepare/initiate the hardware for the scan (if at all).  in scan_curchan_task()
774 	/* XXX scan state can change! Re-validate scan state! */  in scan_curchan_task()
810 	/* XXX scan state can change! Re-validate scan state! */  in scan_end()
818 		    "%s: OOPS! scan cancelled during driver call (1) (ss_iflags=0x%x)!\n",  in scan_end()
824 	 * Record scan complete time.  Note that we also do  in scan_end()
825 	 * this when canceled so any background scan will  in scan_end()
844 	 * If not canceled and scan completed, do post-processing.  in scan_end()
847 	 * notify the driver to end the scan above to avoid having  in scan_end()
848 	 * rx frames alter the scan candidate list.  in scan_end()
887 		    "%s: OOPS! scan cancelled during driver call (2) (ss_iflags=0x%x)!\n",  in scan_end()
905 	 * Clear the SCAN bit first in case frames are  in scan_done()
913 	 * Drop out of power save mode when a scan has  in scan_done()
914 	 * completed.  If this scan was prematurely terminated  in scan_done()
915 	 * because it is a background scan then don't notify  in scan_done()
923 		 * If we're not a scan offload device, come back out of  in scan_done()
930 			    "%s: Dropping out of scan; ss_next=%u, ss_last=%u\n",  in scan_done()
937 		/* send 'scan done' event if not interrupted due to traffic. */  in scan_done()
965 	 * using scan state setup on the initial entry to the timer  in ieee80211_swscan_add_scan()
1018  * Default scan attach method.
1030 	/* Allocate initial scan state */  in ieee80211_swscan_attach()