2 * Scanning implementation
4 * Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi>
5 * Copyright 2004, Instant802 Networks, Inc.
6 * Copyright 2005, Devicescape Software, Inc.
7 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
8 * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
15 #include <linux/if_arp.h>
16 #include <linux/rtnetlink.h>
17 #include <linux/pm_qos.h>
18 #include <net/sch_generic.h>
19 #include <linux/slab.h>
20 #include <linux/export.h>
21 #include <net/mac80211.h>
23 #include "ieee80211_i.h"
24 #include "driver-ops.h"
27 #define IEEE80211_PROBE_DELAY (HZ / 33)
28 #define IEEE80211_CHANNEL_TIME (HZ / 33)
29 #define IEEE80211_PASSIVE_CHANNEL_TIME (HZ / 8)
31 struct ieee80211_bss *
32 ieee80211_rx_bss_get(struct ieee80211_local *local, u8 *bssid, int freq,
33 u8 *ssid, u8 ssid_len)
35 struct cfg80211_bss *cbss;
37 cbss = cfg80211_get_bss(local->hw.wiphy,
38 ieee80211_get_channel(local->hw.wiphy, freq),
39 bssid, ssid, ssid_len, 0, 0);
42 return (void *)cbss->priv;
45 static void ieee80211_rx_bss_free(struct cfg80211_bss *cbss)
47 struct ieee80211_bss *bss = (void *)cbss->priv;
49 kfree(bss_mesh_id(bss));
50 kfree(bss_mesh_cfg(bss));
53 void ieee80211_rx_bss_put(struct ieee80211_local *local,
54 struct ieee80211_bss *bss)
58 cfg80211_put_bss(container_of((void *)bss, struct cfg80211_bss, priv));
61 static bool is_uapsd_supported(struct ieee802_11_elems *elems)
65 if (elems->wmm_info && elems->wmm_info_len == 7
66 && elems->wmm_info[5] == 1)
67 qos_info = elems->wmm_info[6];
68 else if (elems->wmm_param && elems->wmm_param_len == 24
69 && elems->wmm_param[5] == 1)
70 qos_info = elems->wmm_param[6];
72 /* no valid wmm information or parameter element found */
75 return qos_info & IEEE80211_WMM_IE_AP_QOSINFO_UAPSD;
78 struct ieee80211_bss *
79 ieee80211_bss_info_update(struct ieee80211_local *local,
80 struct ieee80211_rx_status *rx_status,
81 struct ieee80211_mgmt *mgmt,
83 struct ieee802_11_elems *elems,
84 struct ieee80211_channel *channel,
87 struct cfg80211_bss *cbss;
88 struct ieee80211_bss *bss;
92 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
93 signal = rx_status->signal * 100;
94 else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
95 signal = (rx_status->signal * 100) / local->hw.max_signal;
97 cbss = cfg80211_inform_bss_frame(local->hw.wiphy, channel,
98 mgmt, len, signal, GFP_ATOMIC);
103 cbss->free_priv = ieee80211_rx_bss_free;
104 bss = (void *)cbss->priv;
106 /* save the ERP value so that it is available at association time */
107 if (elems->erp_info && elems->erp_info_len >= 1) {
108 bss->erp_value = elems->erp_info[0];
109 bss->has_erp_value = 1;
113 struct ieee80211_tim_ie *tim_ie =
114 (struct ieee80211_tim_ie *)elems->tim;
115 bss->dtim_period = tim_ie->dtim_period;
118 /* If the beacon had no TIM IE, or it was invalid, use 1 */
119 if (beacon && !bss->dtim_period)
120 bss->dtim_period = 1;
122 /* replace old supported rates if we get new values */
124 if (elems->supp_rates) {
125 clen = IEEE80211_MAX_SUPP_RATES;
126 if (clen > elems->supp_rates_len)
127 clen = elems->supp_rates_len;
128 memcpy(bss->supp_rates, elems->supp_rates, clen);
131 if (elems->ext_supp_rates) {
132 clen = IEEE80211_MAX_SUPP_RATES - srlen;
133 if (clen > elems->ext_supp_rates_len)
134 clen = elems->ext_supp_rates_len;
135 memcpy(bss->supp_rates + srlen, elems->ext_supp_rates, clen);
139 bss->supp_rates_len = srlen;
141 bss->wmm_used = elems->wmm_param || elems->wmm_info;
142 bss->uapsd_supported = is_uapsd_supported(elems);
145 bss->last_probe_resp = jiffies;
151 ieee80211_scan_rx(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
153 struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb);
154 struct ieee80211_mgmt *mgmt;
155 struct ieee80211_bss *bss;
157 struct ieee80211_channel *channel;
161 bool presp, beacon = false;
162 struct ieee802_11_elems elems;
165 return RX_DROP_UNUSABLE;
167 mgmt = (struct ieee80211_mgmt *) skb->data;
168 fc = mgmt->frame_control;
170 if (ieee80211_is_ctl(fc))
176 presp = ieee80211_is_probe_resp(fc);
178 /* ignore ProbeResp to foreign address */
179 if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN))
180 return RX_DROP_MONITOR;
183 elements = mgmt->u.probe_resp.variable;
184 baselen = offsetof(struct ieee80211_mgmt, u.probe_resp.variable);
186 beacon = ieee80211_is_beacon(fc);
187 baselen = offsetof(struct ieee80211_mgmt, u.beacon.variable);
188 elements = mgmt->u.beacon.variable;
191 if (!presp && !beacon)
194 if (baselen > skb->len)
195 return RX_DROP_MONITOR;
197 ieee802_11_parse_elems(elements, skb->len - baselen, &elems);
199 if (elems.ds_params && elems.ds_params_len == 1)
200 freq = ieee80211_channel_to_frequency(elems.ds_params[0],
203 freq = rx_status->freq;
205 channel = ieee80211_get_channel(sdata->local->hw.wiphy, freq);
207 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
208 return RX_DROP_MONITOR;
210 bss = ieee80211_bss_info_update(sdata->local, rx_status,
211 mgmt, skb->len, &elems,
214 ieee80211_rx_bss_put(sdata->local, bss);
220 /* return false if no more work */
221 static bool ieee80211_prep_hw_scan(struct ieee80211_local *local)
223 struct cfg80211_scan_request *req = local->scan_req;
224 enum ieee80211_band band;
225 int i, ielen, n_chans;
227 if (test_bit(SCAN_HW_CANCELLED, &local->scanning))
231 if (local->hw_scan_band == IEEE80211_NUM_BANDS)
234 band = local->hw_scan_band;
236 for (i = 0; i < req->n_channels; i++) {
237 if (req->channels[i]->band == band) {
238 local->hw_scan_req->channels[n_chans] =
244 local->hw_scan_band++;
247 local->hw_scan_req->n_channels = n_chans;
249 ielen = ieee80211_build_preq_ies(local, (u8 *)local->hw_scan_req->ie,
250 req->ie, req->ie_len, band,
251 req->rates[band], 0);
252 local->hw_scan_req->ie_len = ielen;
253 local->hw_scan_req->no_cck = req->no_cck;
258 static void __ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted,
261 struct ieee80211_local *local = hw_to_local(hw);
263 lockdep_assert_held(&local->mtx);
266 * It's ok to abort a not-yet-running scan (that
267 * we have one at all will be verified by checking
268 * local->scan_req next), but not to complete it
271 if (WARN_ON(!local->scanning && !aborted))
274 if (WARN_ON(!local->scan_req))
277 if (was_hw_scan && !aborted && ieee80211_prep_hw_scan(local)) {
278 int rc = drv_hw_scan(local, local->scan_sdata, local->hw_scan_req);
283 kfree(local->hw_scan_req);
284 local->hw_scan_req = NULL;
286 if (local->scan_req != local->int_scan_req)
287 cfg80211_scan_done(local->scan_req, aborted);
288 local->scan_req = NULL;
289 local->scan_sdata = NULL;
292 local->scan_channel = NULL;
294 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
296 ieee80211_configure_filter(local);
297 drv_sw_scan_complete(local);
298 ieee80211_offchannel_return(local, true);
301 ieee80211_recalc_idle(local);
303 ieee80211_mlme_notify_scan_completed(local);
304 ieee80211_ibss_notify_scan_completed(local);
305 ieee80211_mesh_notify_scan_completed(local);
306 ieee80211_queue_work(&local->hw, &local->work_work);
309 void ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted)
311 struct ieee80211_local *local = hw_to_local(hw);
313 trace_api_scan_completed(local, aborted);
315 set_bit(SCAN_COMPLETED, &local->scanning);
317 set_bit(SCAN_ABORTED, &local->scanning);
318 ieee80211_queue_delayed_work(&local->hw, &local->scan_work, 0);
320 EXPORT_SYMBOL(ieee80211_scan_completed);
322 static int ieee80211_start_sw_scan(struct ieee80211_local *local)
325 * Hardware/driver doesn't support hw_scan, so use software
326 * scanning instead. First send a nullfunc frame with power save
327 * bit on so that AP will buffer the frames for us while we are not
328 * listening, then send probe requests to each channel and wait for
329 * the responses. After all channels are scanned, tune back to the
330 * original channel and send a nullfunc frame with power save bit
331 * off to trigger the AP to send us all the buffered frames.
333 * Note that while local->sw_scanning is true everything else but
334 * nullfunc frames and probe requests will be dropped in
335 * ieee80211_tx_h_check_assoc().
337 drv_sw_scan_start(local);
339 ieee80211_offchannel_stop_beaconing(local);
341 local->leave_oper_channel_time = 0;
342 local->next_scan_state = SCAN_DECISION;
343 local->scan_channel_idx = 0;
345 drv_flush(local, false);
347 ieee80211_configure_filter(local);
349 /* We need to set power level at maximum rate for scanning. */
350 ieee80211_hw_config(local, 0);
352 ieee80211_queue_delayed_work(&local->hw,
354 IEEE80211_CHANNEL_TIME);
360 static int __ieee80211_start_scan(struct ieee80211_sub_if_data *sdata,
361 struct cfg80211_scan_request *req)
363 struct ieee80211_local *local = sdata->local;
366 lockdep_assert_held(&local->mtx);
371 if (!list_empty(&local->work_list)) {
372 /* wait for the work to finish/time out */
373 local->scan_req = req;
374 local->scan_sdata = sdata;
378 if (local->ops->hw_scan) {
381 local->hw_scan_req = kmalloc(
382 sizeof(*local->hw_scan_req) +
383 req->n_channels * sizeof(req->channels[0]) +
384 2 + IEEE80211_MAX_SSID_LEN + local->scan_ies_len +
385 req->ie_len, GFP_KERNEL);
386 if (!local->hw_scan_req)
389 local->hw_scan_req->ssids = req->ssids;
390 local->hw_scan_req->n_ssids = req->n_ssids;
391 ies = (u8 *)local->hw_scan_req +
392 sizeof(*local->hw_scan_req) +
393 req->n_channels * sizeof(req->channels[0]);
394 local->hw_scan_req->ie = ies;
396 local->hw_scan_band = 0;
399 * After allocating local->hw_scan_req, we must
400 * go through until ieee80211_prep_hw_scan(), so
401 * anything that might be changed here and leave
402 * this function early must not go after this
407 local->scan_req = req;
408 local->scan_sdata = sdata;
410 if (local->ops->hw_scan)
411 __set_bit(SCAN_HW_SCANNING, &local->scanning);
413 __set_bit(SCAN_SW_SCANNING, &local->scanning);
415 ieee80211_recalc_idle(local);
417 if (local->ops->hw_scan) {
418 WARN_ON(!ieee80211_prep_hw_scan(local));
419 rc = drv_hw_scan(local, sdata, local->hw_scan_req);
421 rc = ieee80211_start_sw_scan(local);
424 kfree(local->hw_scan_req);
425 local->hw_scan_req = NULL;
428 ieee80211_recalc_idle(local);
430 local->scan_req = NULL;
431 local->scan_sdata = NULL;
438 ieee80211_scan_get_channel_time(struct ieee80211_channel *chan)
441 * TODO: channel switching also consumes quite some time,
442 * add that delay as well to get a better estimation
444 if (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN)
445 return IEEE80211_PASSIVE_CHANNEL_TIME;
446 return IEEE80211_PROBE_DELAY + IEEE80211_CHANNEL_TIME;
449 static void ieee80211_scan_state_decision(struct ieee80211_local *local,
450 unsigned long *next_delay)
452 bool associated = false;
453 bool tx_empty = true;
455 bool listen_int_exceeded;
456 unsigned long min_beacon_int = 0;
457 struct ieee80211_sub_if_data *sdata;
458 struct ieee80211_channel *next_chan;
461 * check if at least one STA interface is associated,
462 * check if at least one STA interface has pending tx frames
463 * and grab the lowest used beacon interval
465 mutex_lock(&local->iflist_mtx);
466 list_for_each_entry(sdata, &local->interfaces, list) {
467 if (!ieee80211_sdata_running(sdata))
470 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
471 if (sdata->u.mgd.associated) {
474 if (sdata->vif.bss_conf.beacon_int <
475 min_beacon_int || min_beacon_int == 0)
477 sdata->vif.bss_conf.beacon_int;
479 if (!qdisc_all_tx_empty(sdata->dev)) {
486 mutex_unlock(&local->iflist_mtx);
488 if (local->scan_channel) {
490 * we're currently scanning a different channel, let's
491 * see if we can scan another channel without interfering
492 * with the current traffic situation.
494 * Since we don't know if the AP has pending frames for us
495 * we can only check for our tx queues and use the current
496 * pm_qos requirements for rx. Hence, if no tx traffic occurs
497 * at all we will scan as many channels in a row as the pm_qos
498 * latency allows us to. Additionally we also check for the
499 * currently negotiated listen interval to prevent losing
500 * frames unnecessarily.
502 * Otherwise switch back to the operating channel.
504 next_chan = local->scan_req->channels[local->scan_channel_idx];
506 bad_latency = time_after(jiffies +
507 ieee80211_scan_get_channel_time(next_chan),
508 local->leave_oper_channel_time +
509 usecs_to_jiffies(pm_qos_request(PM_QOS_NETWORK_LATENCY)));
511 listen_int_exceeded = time_after(jiffies +
512 ieee80211_scan_get_channel_time(next_chan),
513 local->leave_oper_channel_time +
514 usecs_to_jiffies(min_beacon_int * 1024) *
515 local->hw.conf.listen_interval);
517 if (associated && ( !tx_empty || bad_latency ||
518 listen_int_exceeded))
519 local->next_scan_state = SCAN_ENTER_OPER_CHANNEL;
521 local->next_scan_state = SCAN_SET_CHANNEL;
524 * we're on the operating channel currently, let's
525 * leave that channel now to scan another one
527 local->next_scan_state = SCAN_LEAVE_OPER_CHANNEL;
533 static void ieee80211_scan_state_leave_oper_channel(struct ieee80211_local *local,
534 unsigned long *next_delay)
536 ieee80211_offchannel_stop_station(local);
538 __set_bit(SCAN_OFF_CHANNEL, &local->scanning);
541 * What if the nullfunc frames didn't arrive?
543 drv_flush(local, false);
544 if (local->ops->flush)
547 *next_delay = HZ / 10;
549 /* remember when we left the operating channel */
550 local->leave_oper_channel_time = jiffies;
552 /* advance to the next channel to be scanned */
553 local->next_scan_state = SCAN_SET_CHANNEL;
556 static void ieee80211_scan_state_enter_oper_channel(struct ieee80211_local *local,
557 unsigned long *next_delay)
559 /* switch back to the operating channel */
560 local->scan_channel = NULL;
561 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
564 * Only re-enable station mode interface now; beaconing will be
565 * re-enabled once the full scan has been completed.
567 ieee80211_offchannel_return(local, false);
569 __clear_bit(SCAN_OFF_CHANNEL, &local->scanning);
571 *next_delay = HZ / 5;
572 local->next_scan_state = SCAN_DECISION;
575 static void ieee80211_scan_state_set_channel(struct ieee80211_local *local,
576 unsigned long *next_delay)
579 struct ieee80211_channel *chan;
582 chan = local->scan_req->channels[local->scan_channel_idx];
584 local->scan_channel = chan;
586 /* Only call hw-config if we really need to change channels. */
587 if (chan != local->hw.conf.channel)
588 if (ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL))
591 /* advance state machine to next channel/band */
592 local->scan_channel_idx++;
595 /* if we skip this channel return to the decision state */
596 local->next_scan_state = SCAN_DECISION;
601 * Probe delay is used to update the NAV, cf. 11.1.3.2.2
602 * (which unfortunately doesn't say _why_ step a) is done,
603 * but it waits for the probe delay or until a frame is
604 * received - and the received frame would update the NAV).
605 * For now, we do not support waiting until a frame is
608 * In any case, it is not necessary for a passive scan.
610 if (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN ||
611 !local->scan_req->n_ssids) {
612 *next_delay = IEEE80211_PASSIVE_CHANNEL_TIME;
613 local->next_scan_state = SCAN_DECISION;
617 /* active scan, send probes */
618 *next_delay = IEEE80211_PROBE_DELAY;
619 local->next_scan_state = SCAN_SEND_PROBE;
622 static void ieee80211_scan_state_send_probe(struct ieee80211_local *local,
623 unsigned long *next_delay)
626 struct ieee80211_sub_if_data *sdata = local->scan_sdata;
627 enum ieee80211_band band = local->hw.conf.channel->band;
629 for (i = 0; i < local->scan_req->n_ssids; i++)
630 ieee80211_send_probe_req(
632 local->scan_req->ssids[i].ssid,
633 local->scan_req->ssids[i].ssid_len,
634 local->scan_req->ie, local->scan_req->ie_len,
635 local->scan_req->rates[band], false,
636 local->scan_req->no_cck);
639 * After sending probe requests, wait for probe responses
642 *next_delay = IEEE80211_CHANNEL_TIME;
643 local->next_scan_state = SCAN_DECISION;
646 void ieee80211_scan_work(struct work_struct *work)
648 struct ieee80211_local *local =
649 container_of(work, struct ieee80211_local, scan_work.work);
650 struct ieee80211_sub_if_data *sdata;
651 unsigned long next_delay = 0;
652 bool aborted, hw_scan;
654 mutex_lock(&local->mtx);
656 sdata = local->scan_sdata;
658 if (test_and_clear_bit(SCAN_COMPLETED, &local->scanning)) {
659 aborted = test_and_clear_bit(SCAN_ABORTED, &local->scanning);
663 if (!sdata || !local->scan_req)
666 if (local->scan_req && !local->scanning) {
667 struct cfg80211_scan_request *req = local->scan_req;
670 local->scan_req = NULL;
671 local->scan_sdata = NULL;
673 rc = __ieee80211_start_scan(sdata, req);
675 /* need to complete scan in cfg80211 */
676 local->scan_req = req;
684 * Avoid re-scheduling when the sdata is going away.
686 if (!ieee80211_sdata_running(sdata)) {
692 * as long as no delay is required advance immediately
693 * without scheduling a new work
696 if (!ieee80211_sdata_running(sdata)) {
701 switch (local->next_scan_state) {
703 /* if no more bands/channels left, complete scan */
704 if (local->scan_channel_idx >= local->scan_req->n_channels) {
708 ieee80211_scan_state_decision(local, &next_delay);
710 case SCAN_SET_CHANNEL:
711 ieee80211_scan_state_set_channel(local, &next_delay);
713 case SCAN_SEND_PROBE:
714 ieee80211_scan_state_send_probe(local, &next_delay);
716 case SCAN_LEAVE_OPER_CHANNEL:
717 ieee80211_scan_state_leave_oper_channel(local, &next_delay);
719 case SCAN_ENTER_OPER_CHANNEL:
720 ieee80211_scan_state_enter_oper_channel(local, &next_delay);
723 } while (next_delay == 0);
725 ieee80211_queue_delayed_work(&local->hw, &local->scan_work, next_delay);
729 hw_scan = test_bit(SCAN_HW_SCANNING, &local->scanning);
730 __ieee80211_scan_completed(&local->hw, aborted, hw_scan);
732 mutex_unlock(&local->mtx);
735 int ieee80211_request_scan(struct ieee80211_sub_if_data *sdata,
736 struct cfg80211_scan_request *req)
740 mutex_lock(&sdata->local->mtx);
741 res = __ieee80211_start_scan(sdata, req);
742 mutex_unlock(&sdata->local->mtx);
747 int ieee80211_request_internal_scan(struct ieee80211_sub_if_data *sdata,
748 const u8 *ssid, u8 ssid_len,
749 struct ieee80211_channel *chan)
751 struct ieee80211_local *local = sdata->local;
753 enum ieee80211_band band;
755 mutex_lock(&local->mtx);
761 /* fill internal scan request */
765 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
766 if (!local->hw.wiphy->bands[band])
769 i < local->hw.wiphy->bands[band]->n_channels;
771 local->int_scan_req->channels[nchan] =
772 &local->hw.wiphy->bands[band]->channels[i];
777 local->int_scan_req->n_channels = nchan;
779 local->int_scan_req->channels[0] = chan;
780 local->int_scan_req->n_channels = 1;
783 local->int_scan_req->ssids = &local->scan_ssid;
784 local->int_scan_req->n_ssids = 1;
785 memcpy(local->int_scan_req->ssids[0].ssid, ssid, IEEE80211_MAX_SSID_LEN);
786 local->int_scan_req->ssids[0].ssid_len = ssid_len;
788 ret = __ieee80211_start_scan(sdata, sdata->local->int_scan_req);
790 mutex_unlock(&local->mtx);
795 * Only call this function when a scan can't be queued -- under RTNL.
797 void ieee80211_scan_cancel(struct ieee80211_local *local)
800 * We are canceling software scan, or deferred scan that was not
801 * yet really started (see __ieee80211_start_scan ).
803 * Regarding hardware scan:
804 * - we can not call __ieee80211_scan_completed() as when
805 * SCAN_HW_SCANNING bit is set this function change
806 * local->hw_scan_req to operate on 5G band, what race with
807 * driver which can use local->hw_scan_req
809 * - we can not cancel scan_work since driver can schedule it
810 * by ieee80211_scan_completed(..., true) to finish scan
812 * Hence we only call the cancel_hw_scan() callback, but the low-level
813 * driver is still responsible for calling ieee80211_scan_completed()
814 * after the scan was completed/aborted.
817 mutex_lock(&local->mtx);
818 if (!local->scan_req)
822 * We have a scan running and the driver already reported completion,
823 * but the worker hasn't run yet or is stuck on the mutex - mark it as
826 if (test_bit(SCAN_HW_SCANNING, &local->scanning) &&
827 test_bit(SCAN_COMPLETED, &local->scanning)) {
828 set_bit(SCAN_HW_CANCELLED, &local->scanning);
832 if (test_bit(SCAN_HW_SCANNING, &local->scanning)) {
834 * Make sure that __ieee80211_scan_completed doesn't trigger a
835 * scan on another band.
837 set_bit(SCAN_HW_CANCELLED, &local->scanning);
838 if (local->ops->cancel_hw_scan)
839 drv_cancel_hw_scan(local, local->scan_sdata);
844 * If the work is currently running, it must be blocked on
845 * the mutex, but we'll set scan_sdata = NULL and it'll
846 * simply exit once it acquires the mutex.
848 cancel_delayed_work(&local->scan_work);
850 __ieee80211_scan_completed(&local->hw, true, false);
852 mutex_unlock(&local->mtx);
855 int ieee80211_request_sched_scan_start(struct ieee80211_sub_if_data *sdata,
856 struct cfg80211_sched_scan_request *req)
858 struct ieee80211_local *local = sdata->local;
861 mutex_lock(&sdata->local->mtx);
863 if (local->sched_scanning) {
868 if (!local->ops->sched_scan_start) {
873 for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
874 local->sched_scan_ies.ie[i] = kzalloc(2 +
875 IEEE80211_MAX_SSID_LEN +
876 local->scan_ies_len +
879 if (!local->sched_scan_ies.ie[i]) {
884 local->sched_scan_ies.len[i] =
885 ieee80211_build_preq_ies(local,
886 local->sched_scan_ies.ie[i],
887 req->ie, req->ie_len, i,
891 ret = drv_sched_scan_start(local, sdata, req,
892 &local->sched_scan_ies);
894 local->sched_scanning = true;
900 kfree(local->sched_scan_ies.ie[--i]);
902 mutex_unlock(&sdata->local->mtx);
906 int ieee80211_request_sched_scan_stop(struct ieee80211_sub_if_data *sdata)
908 struct ieee80211_local *local = sdata->local;
911 mutex_lock(&sdata->local->mtx);
913 if (!local->ops->sched_scan_stop) {
918 if (local->sched_scanning) {
919 for (i = 0; i < IEEE80211_NUM_BANDS; i++)
920 kfree(local->sched_scan_ies.ie[i]);
922 drv_sched_scan_stop(local, sdata);
923 local->sched_scanning = false;
926 mutex_unlock(&sdata->local->mtx);
931 void ieee80211_sched_scan_results(struct ieee80211_hw *hw)
933 struct ieee80211_local *local = hw_to_local(hw);
935 trace_api_sched_scan_results(local);
937 cfg80211_sched_scan_results(hw->wiphy);
939 EXPORT_SYMBOL(ieee80211_sched_scan_results);
941 void ieee80211_sched_scan_stopped_work(struct work_struct *work)
943 struct ieee80211_local *local =
944 container_of(work, struct ieee80211_local,
945 sched_scan_stopped_work);
948 mutex_lock(&local->mtx);
950 if (!local->sched_scanning) {
951 mutex_unlock(&local->mtx);
955 for (i = 0; i < IEEE80211_NUM_BANDS; i++)
956 kfree(local->sched_scan_ies.ie[i]);
958 local->sched_scanning = false;
960 mutex_unlock(&local->mtx);
962 cfg80211_sched_scan_stopped(local->hw.wiphy);
965 void ieee80211_sched_scan_stopped(struct ieee80211_hw *hw)
967 struct ieee80211_local *local = hw_to_local(hw);
969 trace_api_sched_scan_stopped(local);
971 ieee80211_queue_work(&local->hw, &local->sched_scan_stopped_work);
973 EXPORT_SYMBOL(ieee80211_sched_scan_stopped);