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/wireless.h>
16 #include <linux/if_arp.h>
17 #include <linux/rtnetlink.h>
18 #include <net/mac80211.h>
20 #include "ieee80211_i.h"
21 #include "driver-ops.h"
24 #define IEEE80211_PROBE_DELAY (HZ / 33)
25 #define IEEE80211_CHANNEL_TIME (HZ / 33)
26 #define IEEE80211_PASSIVE_CHANNEL_TIME (HZ / 8)
28 struct ieee80211_bss
*
29 ieee80211_rx_bss_get(struct ieee80211_local
*local
, u8
*bssid
, int freq
,
30 u8
*ssid
, u8 ssid_len
)
32 struct cfg80211_bss
*cbss
;
34 cbss
= cfg80211_get_bss(local
->hw
.wiphy
,
35 ieee80211_get_channel(local
->hw
.wiphy
, freq
),
36 bssid
, ssid
, ssid_len
, 0, 0);
39 return (void *)cbss
->priv
;
42 static void ieee80211_rx_bss_free(struct cfg80211_bss
*cbss
)
44 struct ieee80211_bss
*bss
= (void *)cbss
->priv
;
46 kfree(bss_mesh_id(bss
));
47 kfree(bss_mesh_cfg(bss
));
50 void ieee80211_rx_bss_put(struct ieee80211_local
*local
,
51 struct ieee80211_bss
*bss
)
55 cfg80211_put_bss(container_of((void *)bss
, struct cfg80211_bss
, priv
));
58 struct ieee80211_bss
*
59 ieee80211_bss_info_update(struct ieee80211_local
*local
,
60 struct ieee80211_rx_status
*rx_status
,
61 struct ieee80211_mgmt
*mgmt
,
63 struct ieee802_11_elems
*elems
,
64 struct ieee80211_channel
*channel
,
67 struct cfg80211_bss
*cbss
;
68 struct ieee80211_bss
*bss
;
72 if (local
->hw
.flags
& IEEE80211_HW_SIGNAL_DBM
)
73 signal
= rx_status
->signal
* 100;
74 else if (local
->hw
.flags
& IEEE80211_HW_SIGNAL_UNSPEC
)
75 signal
= (rx_status
->signal
* 100) / local
->hw
.max_signal
;
77 cbss
= cfg80211_inform_bss_frame(local
->hw
.wiphy
, channel
,
78 mgmt
, len
, signal
, GFP_ATOMIC
);
83 cbss
->free_priv
= ieee80211_rx_bss_free
;
84 bss
= (void *)cbss
->priv
;
86 /* save the ERP value so that it is available at association time */
87 if (elems
->erp_info
&& elems
->erp_info_len
>= 1) {
88 bss
->erp_value
= elems
->erp_info
[0];
89 bss
->has_erp_value
= 1;
93 struct ieee80211_tim_ie
*tim_ie
=
94 (struct ieee80211_tim_ie
*)elems
->tim
;
95 bss
->dtim_period
= tim_ie
->dtim_period
;
98 /* set default value for buggy AP/no TIM element */
99 if (bss
->dtim_period
== 0)
100 bss
->dtim_period
= 1;
102 bss
->supp_rates_len
= 0;
103 if (elems
->supp_rates
) {
104 clen
= IEEE80211_MAX_SUPP_RATES
- bss
->supp_rates_len
;
105 if (clen
> elems
->supp_rates_len
)
106 clen
= elems
->supp_rates_len
;
107 memcpy(&bss
->supp_rates
[bss
->supp_rates_len
], elems
->supp_rates
,
109 bss
->supp_rates_len
+= clen
;
111 if (elems
->ext_supp_rates
) {
112 clen
= IEEE80211_MAX_SUPP_RATES
- bss
->supp_rates_len
;
113 if (clen
> elems
->ext_supp_rates_len
)
114 clen
= elems
->ext_supp_rates_len
;
115 memcpy(&bss
->supp_rates
[bss
->supp_rates_len
],
116 elems
->ext_supp_rates
, clen
);
117 bss
->supp_rates_len
+= clen
;
120 bss
->wmm_used
= elems
->wmm_param
|| elems
->wmm_info
;
123 bss
->last_probe_resp
= jiffies
;
129 ieee80211_scan_rx(struct ieee80211_sub_if_data
*sdata
, struct sk_buff
*skb
)
131 struct ieee80211_rx_status
*rx_status
= IEEE80211_SKB_RXCB(skb
);
132 struct ieee80211_mgmt
*mgmt
;
133 struct ieee80211_bss
*bss
;
135 struct ieee80211_channel
*channel
;
139 bool presp
, beacon
= false;
140 struct ieee802_11_elems elems
;
143 return RX_DROP_UNUSABLE
;
145 mgmt
= (struct ieee80211_mgmt
*) skb
->data
;
146 fc
= mgmt
->frame_control
;
148 if (ieee80211_is_ctl(fc
))
152 return RX_DROP_MONITOR
;
154 presp
= ieee80211_is_probe_resp(fc
);
156 /* ignore ProbeResp to foreign address */
157 if (memcmp(mgmt
->da
, sdata
->vif
.addr
, ETH_ALEN
))
158 return RX_DROP_MONITOR
;
161 elements
= mgmt
->u
.probe_resp
.variable
;
162 baselen
= offsetof(struct ieee80211_mgmt
, u
.probe_resp
.variable
);
164 beacon
= ieee80211_is_beacon(fc
);
165 baselen
= offsetof(struct ieee80211_mgmt
, u
.beacon
.variable
);
166 elements
= mgmt
->u
.beacon
.variable
;
169 if (!presp
&& !beacon
)
172 if (baselen
> skb
->len
)
173 return RX_DROP_MONITOR
;
175 ieee802_11_parse_elems(elements
, skb
->len
- baselen
, &elems
);
177 if (elems
.ds_params
&& elems
.ds_params_len
== 1)
178 freq
= ieee80211_channel_to_frequency(elems
.ds_params
[0]);
180 freq
= rx_status
->freq
;
182 channel
= ieee80211_get_channel(sdata
->local
->hw
.wiphy
, freq
);
184 if (!channel
|| channel
->flags
& IEEE80211_CHAN_DISABLED
)
185 return RX_DROP_MONITOR
;
187 bss
= ieee80211_bss_info_update(sdata
->local
, rx_status
,
188 mgmt
, skb
->len
, &elems
,
191 ieee80211_rx_bss_put(sdata
->local
, bss
);
197 /* return false if no more work */
198 static bool ieee80211_prep_hw_scan(struct ieee80211_local
*local
)
200 struct cfg80211_scan_request
*req
= local
->scan_req
;
201 enum ieee80211_band band
;
202 int i
, ielen
, n_chans
;
205 if (local
->hw_scan_band
== IEEE80211_NUM_BANDS
)
208 band
= local
->hw_scan_band
;
210 for (i
= 0; i
< req
->n_channels
; i
++) {
211 if (req
->channels
[i
]->band
== band
) {
212 local
->hw_scan_req
->channels
[n_chans
] =
218 local
->hw_scan_band
++;
221 local
->hw_scan_req
->n_channels
= n_chans
;
223 ielen
= ieee80211_build_preq_ies(local
, (u8
*)local
->hw_scan_req
->ie
,
224 req
->ie
, req
->ie_len
, band
);
225 local
->hw_scan_req
->ie_len
= ielen
;
231 * inform AP that we will go to sleep so that it will buffer the frames
234 static void ieee80211_scan_ps_enable(struct ieee80211_sub_if_data
*sdata
)
236 struct ieee80211_local
*local
= sdata
->local
;
238 local
->scan_ps_enabled
= false;
240 /* FIXME: what to do when local->pspolling is true? */
242 del_timer_sync(&local
->dynamic_ps_timer
);
243 cancel_work_sync(&local
->dynamic_ps_enable_work
);
245 if (local
->hw
.conf
.flags
& IEEE80211_CONF_PS
) {
246 local
->scan_ps_enabled
= true;
247 local
->hw
.conf
.flags
&= ~IEEE80211_CONF_PS
;
248 ieee80211_hw_config(local
, IEEE80211_CONF_CHANGE_PS
);
251 if (!(local
->scan_ps_enabled
) ||
252 !(local
->hw
.flags
& IEEE80211_HW_PS_NULLFUNC_STACK
))
254 * If power save was enabled, no need to send a nullfunc
255 * frame because AP knows that we are sleeping. But if the
256 * hardware is creating the nullfunc frame for power save
257 * status (ie. IEEE80211_HW_PS_NULLFUNC_STACK is not
258 * enabled) and power save was enabled, the firmware just
259 * sent a null frame with power save disabled. So we need
260 * to send a new nullfunc frame to inform the AP that we
261 * are again sleeping.
263 ieee80211_send_nullfunc(local
, sdata
, 1);
266 /* inform AP that we are awake again, unless power save is enabled */
267 static void ieee80211_scan_ps_disable(struct ieee80211_sub_if_data
*sdata
)
269 struct ieee80211_local
*local
= sdata
->local
;
271 if (!local
->ps_sdata
)
272 ieee80211_send_nullfunc(local
, sdata
, 0);
273 else if (local
->scan_ps_enabled
) {
275 * In !IEEE80211_HW_PS_NULLFUNC_STACK case the hardware
276 * will send a nullfunc frame with the powersave bit set
277 * even though the AP already knows that we are sleeping.
278 * This could be avoided by sending a null frame with power
279 * save bit disabled before enabling the power save, but
280 * this doesn't gain anything.
282 * When IEEE80211_HW_PS_NULLFUNC_STACK is enabled, no need
283 * to send a nullfunc frame because AP already knows that
284 * we are sleeping, let's just enable power save mode in
287 local
->hw
.conf
.flags
|= IEEE80211_CONF_PS
;
288 ieee80211_hw_config(local
, IEEE80211_CONF_CHANGE_PS
);
289 } else if (local
->hw
.conf
.dynamic_ps_timeout
> 0) {
291 * If IEEE80211_CONF_PS was not set and the dynamic_ps_timer
292 * had been running before leaving the operating channel,
293 * restart the timer now and send a nullfunc frame to inform
294 * the AP that we are awake.
296 ieee80211_send_nullfunc(local
, sdata
, 0);
297 mod_timer(&local
->dynamic_ps_timer
, jiffies
+
298 msecs_to_jiffies(local
->hw
.conf
.dynamic_ps_timeout
));
302 void ieee80211_scan_completed(struct ieee80211_hw
*hw
, bool aborted
)
304 struct ieee80211_local
*local
= hw_to_local(hw
);
305 struct ieee80211_sub_if_data
*sdata
;
308 mutex_lock(&local
->scan_mtx
);
311 * It's ok to abort a not-yet-running scan (that
312 * we have one at all will be verified by checking
313 * local->scan_req next), but not to complete it
316 if (WARN_ON(!local
->scanning
&& !aborted
))
319 if (WARN_ON(!local
->scan_req
)) {
320 mutex_unlock(&local
->scan_mtx
);
324 was_hw_scan
= test_bit(SCAN_HW_SCANNING
, &local
->scanning
);
325 if (was_hw_scan
&& !aborted
&& ieee80211_prep_hw_scan(local
)) {
326 ieee80211_queue_delayed_work(&local
->hw
,
327 &local
->scan_work
, 0);
328 mutex_unlock(&local
->scan_mtx
);
332 kfree(local
->hw_scan_req
);
333 local
->hw_scan_req
= NULL
;
335 if (local
->scan_req
!= local
->int_scan_req
)
336 cfg80211_scan_done(local
->scan_req
, aborted
);
337 local
->scan_req
= NULL
;
338 local
->scan_sdata
= NULL
;
341 local
->scan_channel
= NULL
;
343 /* we only have to protect scan_req and hw/sw scan */
344 mutex_unlock(&local
->scan_mtx
);
346 ieee80211_hw_config(local
, IEEE80211_CONF_CHANGE_CHANNEL
);
350 ieee80211_configure_filter(local
);
352 drv_sw_scan_complete(local
);
354 mutex_lock(&local
->iflist_mtx
);
355 list_for_each_entry(sdata
, &local
->interfaces
, list
) {
356 if (!ieee80211_sdata_running(sdata
))
359 /* Tell AP we're back */
360 if (sdata
->vif
.type
== NL80211_IFTYPE_STATION
) {
361 if (sdata
->u
.mgd
.associated
) {
362 ieee80211_scan_ps_disable(sdata
);
363 netif_wake_queue(sdata
->dev
);
366 netif_wake_queue(sdata
->dev
);
368 /* re-enable beaconing */
369 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
||
370 sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
||
371 sdata
->vif
.type
== NL80211_IFTYPE_MESH_POINT
)
372 ieee80211_bss_info_change_notify(
373 sdata
, BSS_CHANGED_BEACON_ENABLED
);
375 mutex_unlock(&local
->iflist_mtx
);
378 ieee80211_recalc_idle(local
);
379 ieee80211_mlme_notify_scan_completed(local
);
380 ieee80211_ibss_notify_scan_completed(local
);
381 ieee80211_mesh_notify_scan_completed(local
);
383 EXPORT_SYMBOL(ieee80211_scan_completed
);
385 static int ieee80211_start_sw_scan(struct ieee80211_local
*local
)
387 struct ieee80211_sub_if_data
*sdata
;
390 * Hardware/driver doesn't support hw_scan, so use software
391 * scanning instead. First send a nullfunc frame with power save
392 * bit on so that AP will buffer the frames for us while we are not
393 * listening, then send probe requests to each channel and wait for
394 * the responses. After all channels are scanned, tune back to the
395 * original channel and send a nullfunc frame with power save bit
396 * off to trigger the AP to send us all the buffered frames.
398 * Note that while local->sw_scanning is true everything else but
399 * nullfunc frames and probe requests will be dropped in
400 * ieee80211_tx_h_check_assoc().
402 drv_sw_scan_start(local
);
404 mutex_lock(&local
->iflist_mtx
);
405 list_for_each_entry(sdata
, &local
->interfaces
, list
) {
406 if (!ieee80211_sdata_running(sdata
))
409 /* disable beaconing */
410 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
||
411 sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
||
412 sdata
->vif
.type
== NL80211_IFTYPE_MESH_POINT
)
413 ieee80211_bss_info_change_notify(
414 sdata
, BSS_CHANGED_BEACON_ENABLED
);
417 * only handle non-STA interfaces here, STA interfaces
418 * are handled in the scan state machine
420 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
421 netif_stop_queue(sdata
->dev
);
423 mutex_unlock(&local
->iflist_mtx
);
425 local
->next_scan_state
= SCAN_DECISION
;
426 local
->scan_channel_idx
= 0;
428 drv_flush(local
, false);
430 ieee80211_configure_filter(local
);
432 ieee80211_queue_delayed_work(&local
->hw
,
434 IEEE80211_CHANNEL_TIME
);
440 static int __ieee80211_start_scan(struct ieee80211_sub_if_data
*sdata
,
441 struct cfg80211_scan_request
*req
)
443 struct ieee80211_local
*local
= sdata
->local
;
449 if (local
->ops
->hw_scan
) {
452 local
->hw_scan_req
= kmalloc(
453 sizeof(*local
->hw_scan_req
) +
454 req
->n_channels
* sizeof(req
->channels
[0]) +
455 2 + IEEE80211_MAX_SSID_LEN
+ local
->scan_ies_len
+
456 req
->ie_len
, GFP_KERNEL
);
457 if (!local
->hw_scan_req
)
460 local
->hw_scan_req
->ssids
= req
->ssids
;
461 local
->hw_scan_req
->n_ssids
= req
->n_ssids
;
462 ies
= (u8
*)local
->hw_scan_req
+
463 sizeof(*local
->hw_scan_req
) +
464 req
->n_channels
* sizeof(req
->channels
[0]);
465 local
->hw_scan_req
->ie
= ies
;
467 local
->hw_scan_band
= 0;
470 local
->scan_req
= req
;
471 local
->scan_sdata
= sdata
;
473 if (!list_empty(&local
->work_list
)) {
474 /* wait for the work to finish/time out */
478 if (local
->ops
->hw_scan
)
479 __set_bit(SCAN_HW_SCANNING
, &local
->scanning
);
481 __set_bit(SCAN_SW_SCANNING
, &local
->scanning
);
483 * Kicking off the scan need not be protected,
484 * only the scan variable stuff, since now
485 * local->scan_req is assigned and other callers
486 * will abort their scan attempts.
488 * This avoids getting a scan_mtx -> iflist_mtx
489 * dependency, so that the scan completed calls
490 * have more locking freedom.
493 ieee80211_recalc_idle(local
);
494 mutex_unlock(&local
->scan_mtx
);
496 if (local
->ops
->hw_scan
) {
497 WARN_ON(!ieee80211_prep_hw_scan(local
));
498 rc
= drv_hw_scan(local
, local
->hw_scan_req
);
500 rc
= ieee80211_start_sw_scan(local
);
502 mutex_lock(&local
->scan_mtx
);
505 kfree(local
->hw_scan_req
);
506 local
->hw_scan_req
= NULL
;
509 ieee80211_recalc_idle(local
);
511 local
->scan_req
= NULL
;
512 local
->scan_sdata
= NULL
;
518 static int ieee80211_scan_state_decision(struct ieee80211_local
*local
,
519 unsigned long *next_delay
)
521 bool associated
= false;
522 struct ieee80211_sub_if_data
*sdata
;
524 /* if no more bands/channels left, complete scan and advance to the idle state */
525 if (local
->scan_channel_idx
>= local
->scan_req
->n_channels
) {
526 ieee80211_scan_completed(&local
->hw
, false);
530 /* check if at least one STA interface is associated */
531 mutex_lock(&local
->iflist_mtx
);
532 list_for_each_entry(sdata
, &local
->interfaces
, list
) {
533 if (!ieee80211_sdata_running(sdata
))
536 if (sdata
->vif
.type
== NL80211_IFTYPE_STATION
) {
537 if (sdata
->u
.mgd
.associated
) {
543 mutex_unlock(&local
->iflist_mtx
);
545 if (local
->scan_channel
) {
547 * we're currently scanning a different channel, let's
548 * switch back to the operating channel now if at least
549 * one interface is associated. Otherwise just scan the
553 local
->next_scan_state
= SCAN_ENTER_OPER_CHANNEL
;
555 local
->next_scan_state
= SCAN_SET_CHANNEL
;
558 * we're on the operating channel currently, let's
559 * leave that channel now to scan another one
561 local
->next_scan_state
= SCAN_LEAVE_OPER_CHANNEL
;
568 static void ieee80211_scan_state_leave_oper_channel(struct ieee80211_local
*local
,
569 unsigned long *next_delay
)
571 struct ieee80211_sub_if_data
*sdata
;
574 * notify the AP about us leaving the channel and stop all STA interfaces
576 mutex_lock(&local
->iflist_mtx
);
577 list_for_each_entry(sdata
, &local
->interfaces
, list
) {
578 if (!ieee80211_sdata_running(sdata
))
581 if (sdata
->vif
.type
== NL80211_IFTYPE_STATION
) {
582 netif_stop_queue(sdata
->dev
);
583 if (sdata
->u
.mgd
.associated
)
584 ieee80211_scan_ps_enable(sdata
);
587 mutex_unlock(&local
->iflist_mtx
);
589 __set_bit(SCAN_OFF_CHANNEL
, &local
->scanning
);
592 * What if the nullfunc frames didn't arrive?
594 drv_flush(local
, false);
595 if (local
->ops
->flush
)
598 *next_delay
= HZ
/ 10;
600 /* advance to the next channel to be scanned */
601 local
->next_scan_state
= SCAN_SET_CHANNEL
;
604 static void ieee80211_scan_state_enter_oper_channel(struct ieee80211_local
*local
,
605 unsigned long *next_delay
)
607 struct ieee80211_sub_if_data
*sdata
= local
->scan_sdata
;
609 /* switch back to the operating channel */
610 local
->scan_channel
= NULL
;
611 ieee80211_hw_config(local
, IEEE80211_CONF_CHANGE_CHANNEL
);
614 * notify the AP about us being back and restart all STA interfaces
616 mutex_lock(&local
->iflist_mtx
);
617 list_for_each_entry(sdata
, &local
->interfaces
, list
) {
618 if (!ieee80211_sdata_running(sdata
))
621 /* Tell AP we're back */
622 if (sdata
->vif
.type
== NL80211_IFTYPE_STATION
) {
623 if (sdata
->u
.mgd
.associated
)
624 ieee80211_scan_ps_disable(sdata
);
625 netif_wake_queue(sdata
->dev
);
628 mutex_unlock(&local
->iflist_mtx
);
630 __clear_bit(SCAN_OFF_CHANNEL
, &local
->scanning
);
632 *next_delay
= HZ
/ 5;
633 local
->next_scan_state
= SCAN_DECISION
;
636 static void ieee80211_scan_state_set_channel(struct ieee80211_local
*local
,
637 unsigned long *next_delay
)
640 struct ieee80211_channel
*chan
;
643 chan
= local
->scan_req
->channels
[local
->scan_channel_idx
];
645 local
->scan_channel
= chan
;
646 if (ieee80211_hw_config(local
, IEEE80211_CONF_CHANGE_CHANNEL
))
649 /* advance state machine to next channel/band */
650 local
->scan_channel_idx
++;
653 /* if we skip this channel return to the decision state */
654 local
->next_scan_state
= SCAN_DECISION
;
659 * Probe delay is used to update the NAV, cf. 11.1.3.2.2
660 * (which unfortunately doesn't say _why_ step a) is done,
661 * but it waits for the probe delay or until a frame is
662 * received - and the received frame would update the NAV).
663 * For now, we do not support waiting until a frame is
666 * In any case, it is not necessary for a passive scan.
668 if (chan
->flags
& IEEE80211_CHAN_PASSIVE_SCAN
||
669 !local
->scan_req
->n_ssids
) {
670 *next_delay
= IEEE80211_PASSIVE_CHANNEL_TIME
;
671 local
->next_scan_state
= SCAN_DECISION
;
675 /* active scan, send probes */
676 *next_delay
= IEEE80211_PROBE_DELAY
;
677 local
->next_scan_state
= SCAN_SEND_PROBE
;
680 static void ieee80211_scan_state_send_probe(struct ieee80211_local
*local
,
681 unsigned long *next_delay
)
684 struct ieee80211_sub_if_data
*sdata
= local
->scan_sdata
;
686 for (i
= 0; i
< local
->scan_req
->n_ssids
; i
++)
687 ieee80211_send_probe_req(
689 local
->scan_req
->ssids
[i
].ssid
,
690 local
->scan_req
->ssids
[i
].ssid_len
,
691 local
->scan_req
->ie
, local
->scan_req
->ie_len
);
694 * After sending probe requests, wait for probe responses
697 *next_delay
= IEEE80211_CHANNEL_TIME
;
698 local
->next_scan_state
= SCAN_DECISION
;
701 void ieee80211_scan_work(struct work_struct
*work
)
703 struct ieee80211_local
*local
=
704 container_of(work
, struct ieee80211_local
, scan_work
.work
);
705 struct ieee80211_sub_if_data
*sdata
= local
->scan_sdata
;
706 unsigned long next_delay
= 0;
708 mutex_lock(&local
->scan_mtx
);
709 if (!sdata
|| !local
->scan_req
) {
710 mutex_unlock(&local
->scan_mtx
);
714 if (local
->hw_scan_req
) {
715 int rc
= drv_hw_scan(local
, local
->hw_scan_req
);
716 mutex_unlock(&local
->scan_mtx
);
718 ieee80211_scan_completed(&local
->hw
, true);
722 if (local
->scan_req
&& !local
->scanning
) {
723 struct cfg80211_scan_request
*req
= local
->scan_req
;
726 local
->scan_req
= NULL
;
727 local
->scan_sdata
= NULL
;
729 rc
= __ieee80211_start_scan(sdata
, req
);
730 mutex_unlock(&local
->scan_mtx
);
733 ieee80211_scan_completed(&local
->hw
, true);
737 mutex_unlock(&local
->scan_mtx
);
740 * Avoid re-scheduling when the sdata is going away.
742 if (!ieee80211_sdata_running(sdata
)) {
743 ieee80211_scan_completed(&local
->hw
, true);
748 * as long as no delay is required advance immediately
749 * without scheduling a new work
752 switch (local
->next_scan_state
) {
754 if (ieee80211_scan_state_decision(local
, &next_delay
))
757 case SCAN_SET_CHANNEL
:
758 ieee80211_scan_state_set_channel(local
, &next_delay
);
760 case SCAN_SEND_PROBE
:
761 ieee80211_scan_state_send_probe(local
, &next_delay
);
763 case SCAN_LEAVE_OPER_CHANNEL
:
764 ieee80211_scan_state_leave_oper_channel(local
, &next_delay
);
766 case SCAN_ENTER_OPER_CHANNEL
:
767 ieee80211_scan_state_enter_oper_channel(local
, &next_delay
);
770 } while (next_delay
== 0);
772 ieee80211_queue_delayed_work(&local
->hw
, &local
->scan_work
, next_delay
);
775 int ieee80211_request_scan(struct ieee80211_sub_if_data
*sdata
,
776 struct cfg80211_scan_request
*req
)
780 mutex_lock(&sdata
->local
->scan_mtx
);
781 res
= __ieee80211_start_scan(sdata
, req
);
782 mutex_unlock(&sdata
->local
->scan_mtx
);
787 int ieee80211_request_internal_scan(struct ieee80211_sub_if_data
*sdata
,
788 const u8
*ssid
, u8 ssid_len
)
790 struct ieee80211_local
*local
= sdata
->local
;
793 mutex_lock(&local
->scan_mtx
);
799 memcpy(local
->int_scan_req
->ssids
[0].ssid
, ssid
, IEEE80211_MAX_SSID_LEN
);
800 local
->int_scan_req
->ssids
[0].ssid_len
= ssid_len
;
802 ret
= __ieee80211_start_scan(sdata
, sdata
->local
->int_scan_req
);
804 mutex_unlock(&local
->scan_mtx
);
808 void ieee80211_scan_cancel(struct ieee80211_local
*local
)
812 cancel_delayed_work_sync(&local
->scan_work
);
815 * Only call this function when a scan can't be
816 * queued -- mostly at suspend under RTNL.
818 mutex_lock(&local
->scan_mtx
);
819 abortscan
= test_bit(SCAN_SW_SCANNING
, &local
->scanning
) ||
820 (!local
->scanning
&& local
->scan_req
);
821 mutex_unlock(&local
->scan_mtx
);
824 ieee80211_scan_completed(&local
->hw
, true);