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_params.h>
18 #include <net/sch_generic.h>
19 #include <linux/slab.h>
20 #include <net/mac80211.h>
22 #include "ieee80211_i.h"
23 #include "driver-ops.h"
26 #define IEEE80211_PROBE_DELAY (HZ / 33)
27 #define IEEE80211_CHANNEL_TIME (HZ / 33)
28 #define IEEE80211_PASSIVE_CHANNEL_TIME (HZ / 8)
30 struct ieee80211_bss
*
31 ieee80211_rx_bss_get(struct ieee80211_local
*local
, u8
*bssid
, int freq
,
32 u8
*ssid
, u8 ssid_len
)
34 struct cfg80211_bss
*cbss
;
36 cbss
= cfg80211_get_bss(local
->hw
.wiphy
,
37 ieee80211_get_channel(local
->hw
.wiphy
, freq
),
38 bssid
, ssid
, ssid_len
, 0, 0);
41 return (void *)cbss
->priv
;
44 static void ieee80211_rx_bss_free(struct cfg80211_bss
*cbss
)
46 struct ieee80211_bss
*bss
= (void *)cbss
->priv
;
48 kfree(bss_mesh_id(bss
));
49 kfree(bss_mesh_cfg(bss
));
52 void ieee80211_rx_bss_put(struct ieee80211_local
*local
,
53 struct ieee80211_bss
*bss
)
57 cfg80211_put_bss(container_of((void *)bss
, struct cfg80211_bss
, priv
));
60 static bool is_uapsd_supported(struct ieee802_11_elems
*elems
)
64 if (elems
->wmm_info
&& elems
->wmm_info_len
== 7
65 && elems
->wmm_info
[5] == 1)
66 qos_info
= elems
->wmm_info
[6];
67 else if (elems
->wmm_param
&& elems
->wmm_param_len
== 24
68 && elems
->wmm_param
[5] == 1)
69 qos_info
= elems
->wmm_param
[6];
71 /* no valid wmm information or parameter element found */
74 return qos_info
& IEEE80211_WMM_IE_AP_QOSINFO_UAPSD
;
77 struct ieee80211_bss
*
78 ieee80211_bss_info_update(struct ieee80211_local
*local
,
79 struct ieee80211_rx_status
*rx_status
,
80 struct ieee80211_mgmt
*mgmt
,
82 struct ieee802_11_elems
*elems
,
83 struct ieee80211_channel
*channel
,
86 struct cfg80211_bss
*cbss
;
87 struct ieee80211_bss
*bss
;
91 if (local
->hw
.flags
& IEEE80211_HW_SIGNAL_DBM
)
92 signal
= rx_status
->signal
* 100;
93 else if (local
->hw
.flags
& IEEE80211_HW_SIGNAL_UNSPEC
)
94 signal
= (rx_status
->signal
* 100) / local
->hw
.max_signal
;
96 cbss
= cfg80211_inform_bss_frame(local
->hw
.wiphy
, channel
,
97 mgmt
, len
, signal
, GFP_ATOMIC
);
102 cbss
->free_priv
= ieee80211_rx_bss_free
;
103 bss
= (void *)cbss
->priv
;
105 /* save the ERP value so that it is available at association time */
106 if (elems
->erp_info
&& elems
->erp_info_len
>= 1) {
107 bss
->erp_value
= elems
->erp_info
[0];
108 bss
->has_erp_value
= 1;
112 struct ieee80211_tim_ie
*tim_ie
=
113 (struct ieee80211_tim_ie
*)elems
->tim
;
114 bss
->dtim_period
= tim_ie
->dtim_period
;
117 /* If the beacon had no TIM IE, or it was invalid, use 1 */
118 if (beacon
&& !bss
->dtim_period
)
119 bss
->dtim_period
= 1;
121 /* replace old supported rates if we get new values */
123 if (elems
->supp_rates
) {
124 clen
= IEEE80211_MAX_SUPP_RATES
;
125 if (clen
> elems
->supp_rates_len
)
126 clen
= elems
->supp_rates_len
;
127 memcpy(bss
->supp_rates
, elems
->supp_rates
, clen
);
130 if (elems
->ext_supp_rates
) {
131 clen
= IEEE80211_MAX_SUPP_RATES
- srlen
;
132 if (clen
> elems
->ext_supp_rates_len
)
133 clen
= elems
->ext_supp_rates_len
;
134 memcpy(bss
->supp_rates
+ srlen
, elems
->ext_supp_rates
, clen
);
138 bss
->supp_rates_len
= srlen
;
140 bss
->wmm_used
= elems
->wmm_param
|| elems
->wmm_info
;
141 bss
->uapsd_supported
= is_uapsd_supported(elems
);
144 bss
->last_probe_resp
= jiffies
;
150 ieee80211_scan_rx(struct ieee80211_sub_if_data
*sdata
, struct sk_buff
*skb
)
152 struct ieee80211_rx_status
*rx_status
= IEEE80211_SKB_RXCB(skb
);
153 struct ieee80211_mgmt
*mgmt
;
154 struct ieee80211_bss
*bss
;
156 struct ieee80211_channel
*channel
;
160 bool presp
, beacon
= false;
161 struct ieee802_11_elems elems
;
164 return RX_DROP_UNUSABLE
;
166 mgmt
= (struct ieee80211_mgmt
*) skb
->data
;
167 fc
= mgmt
->frame_control
;
169 if (ieee80211_is_ctl(fc
))
173 return RX_DROP_MONITOR
;
175 presp
= ieee80211_is_probe_resp(fc
);
177 /* ignore ProbeResp to foreign address */
178 if (memcmp(mgmt
->da
, sdata
->vif
.addr
, ETH_ALEN
))
179 return RX_DROP_MONITOR
;
182 elements
= mgmt
->u
.probe_resp
.variable
;
183 baselen
= offsetof(struct ieee80211_mgmt
, u
.probe_resp
.variable
);
185 beacon
= ieee80211_is_beacon(fc
);
186 baselen
= offsetof(struct ieee80211_mgmt
, u
.beacon
.variable
);
187 elements
= mgmt
->u
.beacon
.variable
;
190 if (!presp
&& !beacon
)
193 if (baselen
> skb
->len
)
194 return RX_DROP_MONITOR
;
196 ieee802_11_parse_elems(elements
, skb
->len
- baselen
, &elems
);
198 if (elems
.ds_params
&& elems
.ds_params_len
== 1)
199 freq
= ieee80211_channel_to_frequency(elems
.ds_params
[0],
202 freq
= rx_status
->freq
;
204 channel
= ieee80211_get_channel(sdata
->local
->hw
.wiphy
, freq
);
206 if (!channel
|| channel
->flags
& IEEE80211_CHAN_DISABLED
)
207 return RX_DROP_MONITOR
;
209 bss
= ieee80211_bss_info_update(sdata
->local
, rx_status
,
210 mgmt
, skb
->len
, &elems
,
213 ieee80211_rx_bss_put(sdata
->local
, bss
);
215 /* If we are on-operating-channel, and this packet is for the
216 * current channel, pass the pkt on up the stack so that
217 * the rest of the stack can make use of it.
219 if (ieee80211_cfg_on_oper_channel(sdata
->local
)
220 && (channel
== sdata
->local
->oper_channel
))
227 /* return false if no more work */
228 static bool ieee80211_prep_hw_scan(struct ieee80211_local
*local
)
230 struct cfg80211_scan_request
*req
= local
->scan_req
;
231 enum ieee80211_band band
;
232 int i
, ielen
, n_chans
;
235 if (local
->hw_scan_band
== IEEE80211_NUM_BANDS
)
238 band
= local
->hw_scan_band
;
240 for (i
= 0; i
< req
->n_channels
; i
++) {
241 if (req
->channels
[i
]->band
== band
) {
242 local
->hw_scan_req
->channels
[n_chans
] =
248 local
->hw_scan_band
++;
251 local
->hw_scan_req
->n_channels
= n_chans
;
253 ielen
= ieee80211_build_preq_ies(local
, (u8
*)local
->hw_scan_req
->ie
,
254 req
->ie
, req
->ie_len
, band
, (u32
) -1,
256 local
->hw_scan_req
->ie_len
= ielen
;
261 static bool __ieee80211_scan_completed(struct ieee80211_hw
*hw
, bool aborted
,
264 struct ieee80211_local
*local
= hw_to_local(hw
);
266 lockdep_assert_held(&local
->mtx
);
269 * It's ok to abort a not-yet-running scan (that
270 * we have one at all will be verified by checking
271 * local->scan_req next), but not to complete it
274 if (WARN_ON(!local
->scanning
&& !aborted
))
277 if (WARN_ON(!local
->scan_req
))
280 if (was_hw_scan
&& !aborted
&& ieee80211_prep_hw_scan(local
)) {
281 int rc
= drv_hw_scan(local
, local
->scan_sdata
, local
->hw_scan_req
);
286 kfree(local
->hw_scan_req
);
287 local
->hw_scan_req
= NULL
;
289 if (local
->scan_req
!= local
->int_scan_req
)
290 cfg80211_scan_done(local
->scan_req
, aborted
);
291 local
->scan_req
= NULL
;
292 local
->scan_sdata
= NULL
;
295 local
->scan_channel
= NULL
;
300 static void __ieee80211_scan_completed_finish(struct ieee80211_hw
*hw
,
303 struct ieee80211_local
*local
= hw_to_local(hw
);
305 bool enable_beacons
= false;
307 mutex_lock(&local
->mtx
);
308 on_oper_chan
= ieee80211_cfg_on_oper_channel(local
);
310 WARN_ON(local
->scanning
& (SCAN_SW_SCANNING
| SCAN_HW_SCANNING
));
312 if (was_hw_scan
|| !on_oper_chan
) {
313 if (WARN_ON(local
->scan_channel
))
314 local
->scan_channel
= NULL
;
315 ieee80211_hw_config(local
, IEEE80211_CONF_CHANGE_CHANNEL
);
317 /* Set power back to normal operating levels. */
318 ieee80211_hw_config(local
, 0);
322 ieee80211_configure_filter(local
);
323 drv_sw_scan_complete(local
);
324 on_oper_chan2
= ieee80211_cfg_on_oper_channel(local
);
325 /* We should always be on-channel at this point. */
326 WARN_ON(!on_oper_chan2
);
327 if (on_oper_chan2
&& (on_oper_chan
!= on_oper_chan2
))
328 enable_beacons
= true;
330 ieee80211_offchannel_return(local
, enable_beacons
, true);
333 ieee80211_recalc_idle(local
);
334 mutex_unlock(&local
->mtx
);
336 ieee80211_mlme_notify_scan_completed(local
);
337 ieee80211_ibss_notify_scan_completed(local
);
338 ieee80211_mesh_notify_scan_completed(local
);
339 ieee80211_queue_work(&local
->hw
, &local
->work_work
);
342 void ieee80211_scan_completed(struct ieee80211_hw
*hw
, bool aborted
)
344 struct ieee80211_local
*local
= hw_to_local(hw
);
346 trace_api_scan_completed(local
, aborted
);
348 set_bit(SCAN_COMPLETED
, &local
->scanning
);
350 set_bit(SCAN_ABORTED
, &local
->scanning
);
351 ieee80211_queue_delayed_work(&local
->hw
, &local
->scan_work
, 0);
353 EXPORT_SYMBOL(ieee80211_scan_completed
);
355 static int ieee80211_start_sw_scan(struct ieee80211_local
*local
)
358 * Hardware/driver doesn't support hw_scan, so use software
359 * scanning instead. First send a nullfunc frame with power save
360 * bit on so that AP will buffer the frames for us while we are not
361 * listening, then send probe requests to each channel and wait for
362 * the responses. After all channels are scanned, tune back to the
363 * original channel and send a nullfunc frame with power save bit
364 * off to trigger the AP to send us all the buffered frames.
366 * Note that while local->sw_scanning is true everything else but
367 * nullfunc frames and probe requests will be dropped in
368 * ieee80211_tx_h_check_assoc().
370 drv_sw_scan_start(local
);
372 local
->leave_oper_channel_time
= 0;
373 local
->next_scan_state
= SCAN_DECISION
;
374 local
->scan_channel_idx
= 0;
376 /* We always want to use off-channel PS, even if we
377 * are not really leaving oper-channel. Don't
378 * tell the AP though, as long as we are on-channel.
380 ieee80211_offchannel_enable_all_ps(local
, false);
382 ieee80211_configure_filter(local
);
384 /* We need to set power level at maximum rate for scanning. */
385 ieee80211_hw_config(local
, 0);
387 ieee80211_queue_delayed_work(&local
->hw
,
389 IEEE80211_CHANNEL_TIME
);
395 static int __ieee80211_start_scan(struct ieee80211_sub_if_data
*sdata
,
396 struct cfg80211_scan_request
*req
)
398 struct ieee80211_local
*local
= sdata
->local
;
401 lockdep_assert_held(&local
->mtx
);
406 if (!list_empty(&local
->work_list
)) {
407 /* wait for the work to finish/time out */
408 local
->scan_req
= req
;
409 local
->scan_sdata
= sdata
;
413 if (local
->ops
->hw_scan
) {
416 local
->hw_scan_req
= kmalloc(
417 sizeof(*local
->hw_scan_req
) +
418 req
->n_channels
* sizeof(req
->channels
[0]) +
419 2 + IEEE80211_MAX_SSID_LEN
+ local
->scan_ies_len
+
420 req
->ie_len
, GFP_KERNEL
);
421 if (!local
->hw_scan_req
)
424 local
->hw_scan_req
->ssids
= req
->ssids
;
425 local
->hw_scan_req
->n_ssids
= req
->n_ssids
;
426 ies
= (u8
*)local
->hw_scan_req
+
427 sizeof(*local
->hw_scan_req
) +
428 req
->n_channels
* sizeof(req
->channels
[0]);
429 local
->hw_scan_req
->ie
= ies
;
431 local
->hw_scan_band
= 0;
434 * After allocating local->hw_scan_req, we must
435 * go through until ieee80211_prep_hw_scan(), so
436 * anything that might be changed here and leave
437 * this function early must not go after this
442 local
->scan_req
= req
;
443 local
->scan_sdata
= sdata
;
445 if (local
->ops
->hw_scan
)
446 __set_bit(SCAN_HW_SCANNING
, &local
->scanning
);
448 __set_bit(SCAN_SW_SCANNING
, &local
->scanning
);
450 ieee80211_recalc_idle(local
);
452 if (local
->ops
->hw_scan
) {
453 WARN_ON(!ieee80211_prep_hw_scan(local
));
454 rc
= drv_hw_scan(local
, sdata
, local
->hw_scan_req
);
456 rc
= ieee80211_start_sw_scan(local
);
459 kfree(local
->hw_scan_req
);
460 local
->hw_scan_req
= NULL
;
463 ieee80211_recalc_idle(local
);
465 local
->scan_req
= NULL
;
466 local
->scan_sdata
= NULL
;
473 ieee80211_scan_get_channel_time(struct ieee80211_channel
*chan
)
476 * TODO: channel switching also consumes quite some time,
477 * add that delay as well to get a better estimation
479 if (chan
->flags
& IEEE80211_CHAN_PASSIVE_SCAN
)
480 return IEEE80211_PASSIVE_CHANNEL_TIME
;
481 return IEEE80211_PROBE_DELAY
+ IEEE80211_CHANNEL_TIME
;
484 static void ieee80211_scan_state_decision(struct ieee80211_local
*local
,
485 unsigned long *next_delay
)
487 bool associated
= false;
488 bool tx_empty
= true;
490 bool listen_int_exceeded
;
491 unsigned long min_beacon_int
= 0;
492 struct ieee80211_sub_if_data
*sdata
;
493 struct ieee80211_channel
*next_chan
;
496 * check if at least one STA interface is associated,
497 * check if at least one STA interface has pending tx frames
498 * and grab the lowest used beacon interval
500 mutex_lock(&local
->iflist_mtx
);
501 list_for_each_entry(sdata
, &local
->interfaces
, list
) {
502 if (!ieee80211_sdata_running(sdata
))
505 if (sdata
->vif
.type
== NL80211_IFTYPE_STATION
) {
506 if (sdata
->u
.mgd
.associated
) {
509 if (sdata
->vif
.bss_conf
.beacon_int
<
510 min_beacon_int
|| min_beacon_int
== 0)
512 sdata
->vif
.bss_conf
.beacon_int
;
514 if (!qdisc_all_tx_empty(sdata
->dev
)) {
521 mutex_unlock(&local
->iflist_mtx
);
523 next_chan
= local
->scan_req
->channels
[local
->scan_channel_idx
];
525 if (ieee80211_cfg_on_oper_channel(local
)) {
526 /* We're currently on operating channel. */
527 if (next_chan
== local
->oper_channel
)
528 /* We don't need to move off of operating channel. */
529 local
->next_scan_state
= SCAN_SET_CHANNEL
;
532 * We do need to leave operating channel, as next
533 * scan is somewhere else.
535 local
->next_scan_state
= SCAN_LEAVE_OPER_CHANNEL
;
538 * we're currently scanning a different channel, let's
539 * see if we can scan another channel without interfering
540 * with the current traffic situation.
542 * Since we don't know if the AP has pending frames for us
543 * we can only check for our tx queues and use the current
544 * pm_qos requirements for rx. Hence, if no tx traffic occurs
545 * at all we will scan as many channels in a row as the pm_qos
546 * latency allows us to. Additionally we also check for the
547 * currently negotiated listen interval to prevent losing
548 * frames unnecessarily.
550 * Otherwise switch back to the operating channel.
553 bad_latency
= time_after(jiffies
+
554 ieee80211_scan_get_channel_time(next_chan
),
555 local
->leave_oper_channel_time
+
556 usecs_to_jiffies(pm_qos_request(PM_QOS_NETWORK_LATENCY
)));
558 listen_int_exceeded
= time_after(jiffies
+
559 ieee80211_scan_get_channel_time(next_chan
),
560 local
->leave_oper_channel_time
+
561 usecs_to_jiffies(min_beacon_int
* 1024) *
562 local
->hw
.conf
.listen_interval
);
564 if (associated
&& ( !tx_empty
|| bad_latency
||
565 listen_int_exceeded
))
566 local
->next_scan_state
= SCAN_ENTER_OPER_CHANNEL
;
568 local
->next_scan_state
= SCAN_SET_CHANNEL
;
574 static void ieee80211_scan_state_leave_oper_channel(struct ieee80211_local
*local
,
575 unsigned long *next_delay
)
577 /* PS will already be in off-channel mode,
578 * we do that once at the beginning of scanning.
580 ieee80211_offchannel_stop_vifs(local
, false);
583 * What if the nullfunc frames didn't arrive?
585 drv_flush(local
, false);
586 if (local
->ops
->flush
)
589 *next_delay
= HZ
/ 10;
591 /* remember when we left the operating channel */
592 local
->leave_oper_channel_time
= jiffies
;
594 /* advance to the next channel to be scanned */
595 local
->next_scan_state
= SCAN_SET_CHANNEL
;
598 static void ieee80211_scan_state_enter_oper_channel(struct ieee80211_local
*local
,
599 unsigned long *next_delay
)
601 /* switch back to the operating channel */
602 local
->scan_channel
= NULL
;
603 if (!ieee80211_cfg_on_oper_channel(local
))
604 ieee80211_hw_config(local
, IEEE80211_CONF_CHANGE_CHANNEL
);
607 * Re-enable vifs and beaconing. Leave PS
608 * in off-channel state..will put that back
609 * on-channel at the end of scanning.
611 ieee80211_offchannel_return(local
, true, false);
613 *next_delay
= HZ
/ 5;
614 local
->next_scan_state
= SCAN_DECISION
;
617 static void ieee80211_scan_state_set_channel(struct ieee80211_local
*local
,
618 unsigned long *next_delay
)
621 struct ieee80211_channel
*chan
;
624 chan
= local
->scan_req
->channels
[local
->scan_channel_idx
];
626 local
->scan_channel
= chan
;
628 /* Only call hw-config if we really need to change channels. */
629 if (chan
!= local
->hw
.conf
.channel
)
630 if (ieee80211_hw_config(local
, IEEE80211_CONF_CHANGE_CHANNEL
))
633 /* advance state machine to next channel/band */
634 local
->scan_channel_idx
++;
637 /* if we skip this channel return to the decision state */
638 local
->next_scan_state
= SCAN_DECISION
;
643 * Probe delay is used to update the NAV, cf. 11.1.3.2.2
644 * (which unfortunately doesn't say _why_ step a) is done,
645 * but it waits for the probe delay or until a frame is
646 * received - and the received frame would update the NAV).
647 * For now, we do not support waiting until a frame is
650 * In any case, it is not necessary for a passive scan.
652 if (chan
->flags
& IEEE80211_CHAN_PASSIVE_SCAN
||
653 !local
->scan_req
->n_ssids
) {
654 *next_delay
= IEEE80211_PASSIVE_CHANNEL_TIME
;
655 local
->next_scan_state
= SCAN_DECISION
;
659 /* active scan, send probes */
660 *next_delay
= IEEE80211_PROBE_DELAY
;
661 local
->next_scan_state
= SCAN_SEND_PROBE
;
664 static void ieee80211_scan_state_send_probe(struct ieee80211_local
*local
,
665 unsigned long *next_delay
)
668 struct ieee80211_sub_if_data
*sdata
= local
->scan_sdata
;
670 for (i
= 0; i
< local
->scan_req
->n_ssids
; i
++)
671 ieee80211_send_probe_req(
673 local
->scan_req
->ssids
[i
].ssid
,
674 local
->scan_req
->ssids
[i
].ssid_len
,
675 local
->scan_req
->ie
, local
->scan_req
->ie_len
);
678 * After sending probe requests, wait for probe responses
681 *next_delay
= IEEE80211_CHANNEL_TIME
;
682 local
->next_scan_state
= SCAN_DECISION
;
685 void ieee80211_scan_work(struct work_struct
*work
)
687 struct ieee80211_local
*local
=
688 container_of(work
, struct ieee80211_local
, scan_work
.work
);
689 struct ieee80211_sub_if_data
*sdata
= local
->scan_sdata
;
690 unsigned long next_delay
= 0;
691 bool aborted
, hw_scan
, finish
;
693 mutex_lock(&local
->mtx
);
695 if (test_and_clear_bit(SCAN_COMPLETED
, &local
->scanning
)) {
696 aborted
= test_and_clear_bit(SCAN_ABORTED
, &local
->scanning
);
700 if (!sdata
|| !local
->scan_req
)
703 if (local
->scan_req
&& !local
->scanning
) {
704 struct cfg80211_scan_request
*req
= local
->scan_req
;
707 local
->scan_req
= NULL
;
708 local
->scan_sdata
= NULL
;
710 rc
= __ieee80211_start_scan(sdata
, req
);
712 /* need to complete scan in cfg80211 */
713 local
->scan_req
= req
;
721 * Avoid re-scheduling when the sdata is going away.
723 if (!ieee80211_sdata_running(sdata
)) {
729 * as long as no delay is required advance immediately
730 * without scheduling a new work
733 switch (local
->next_scan_state
) {
735 /* if no more bands/channels left, complete scan */
736 if (local
->scan_channel_idx
>= local
->scan_req
->n_channels
) {
740 ieee80211_scan_state_decision(local
, &next_delay
);
742 case SCAN_SET_CHANNEL
:
743 ieee80211_scan_state_set_channel(local
, &next_delay
);
745 case SCAN_SEND_PROBE
:
746 ieee80211_scan_state_send_probe(local
, &next_delay
);
748 case SCAN_LEAVE_OPER_CHANNEL
:
749 ieee80211_scan_state_leave_oper_channel(local
, &next_delay
);
751 case SCAN_ENTER_OPER_CHANNEL
:
752 ieee80211_scan_state_enter_oper_channel(local
, &next_delay
);
755 } while (next_delay
== 0);
757 ieee80211_queue_delayed_work(&local
->hw
, &local
->scan_work
, next_delay
);
758 mutex_unlock(&local
->mtx
);
762 hw_scan
= test_bit(SCAN_HW_SCANNING
, &local
->scanning
);
763 finish
= __ieee80211_scan_completed(&local
->hw
, aborted
, hw_scan
);
764 mutex_unlock(&local
->mtx
);
766 __ieee80211_scan_completed_finish(&local
->hw
, hw_scan
);
770 mutex_unlock(&local
->mtx
);
773 int ieee80211_request_scan(struct ieee80211_sub_if_data
*sdata
,
774 struct cfg80211_scan_request
*req
)
778 mutex_lock(&sdata
->local
->mtx
);
779 res
= __ieee80211_start_scan(sdata
, req
);
780 mutex_unlock(&sdata
->local
->mtx
);
785 int ieee80211_request_internal_scan(struct ieee80211_sub_if_data
*sdata
,
786 const u8
*ssid
, u8 ssid_len
,
787 struct ieee80211_channel
*chan
)
789 struct ieee80211_local
*local
= sdata
->local
;
791 enum ieee80211_band band
;
793 mutex_lock(&local
->mtx
);
799 /* fill internal scan request */
803 for (band
= 0; band
< IEEE80211_NUM_BANDS
; band
++) {
804 if (!local
->hw
.wiphy
->bands
[band
])
807 i
< local
->hw
.wiphy
->bands
[band
]->n_channels
;
809 local
->int_scan_req
->channels
[nchan
] =
810 &local
->hw
.wiphy
->bands
[band
]->channels
[i
];
815 local
->int_scan_req
->n_channels
= nchan
;
817 local
->int_scan_req
->channels
[0] = chan
;
818 local
->int_scan_req
->n_channels
= 1;
821 local
->int_scan_req
->ssids
= &local
->scan_ssid
;
822 local
->int_scan_req
->n_ssids
= 1;
823 memcpy(local
->int_scan_req
->ssids
[0].ssid
, ssid
, IEEE80211_MAX_SSID_LEN
);
824 local
->int_scan_req
->ssids
[0].ssid_len
= ssid_len
;
826 ret
= __ieee80211_start_scan(sdata
, sdata
->local
->int_scan_req
);
828 mutex_unlock(&local
->mtx
);
833 * Only call this function when a scan can't be queued -- under RTNL.
835 void ieee80211_scan_cancel(struct ieee80211_local
*local
)
841 * We are only canceling software scan, or deferred scan that was not
842 * yet really started (see __ieee80211_start_scan ).
844 * Regarding hardware scan:
845 * - we can not call __ieee80211_scan_completed() as when
846 * SCAN_HW_SCANNING bit is set this function change
847 * local->hw_scan_req to operate on 5G band, what race with
848 * driver which can use local->hw_scan_req
850 * - we can not cancel scan_work since driver can schedule it
851 * by ieee80211_scan_completed(..., true) to finish scan
853 * Hence low lever driver is responsible for canceling HW scan.
856 mutex_lock(&local
->mtx
);
857 abortscan
= local
->scan_req
&& !test_bit(SCAN_HW_SCANNING
, &local
->scanning
);
859 finish
= __ieee80211_scan_completed(&local
->hw
, true, false);
860 mutex_unlock(&local
->mtx
);
863 /* The scan is canceled, but stop work from being pending */
864 cancel_delayed_work_sync(&local
->scan_work
);
867 __ieee80211_scan_completed_finish(&local
->hw
, false);