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
;
228 if (local
->hw_scan_band
== IEEE80211_NUM_BANDS
)
231 band
= local
->hw_scan_band
;
233 for (i
= 0; i
< req
->n_channels
; i
++) {
234 if (req
->channels
[i
]->band
== band
) {
235 local
->hw_scan_req
->channels
[n_chans
] =
241 local
->hw_scan_band
++;
244 local
->hw_scan_req
->n_channels
= n_chans
;
246 ielen
= ieee80211_build_preq_ies(local
, (u8
*)local
->hw_scan_req
->ie
,
247 req
->ie
, req
->ie_len
, band
,
248 req
->rates
[band
], 0);
249 local
->hw_scan_req
->ie_len
= ielen
;
250 local
->hw_scan_req
->no_cck
= req
->no_cck
;
255 static void __ieee80211_scan_completed(struct ieee80211_hw
*hw
, bool aborted
,
258 struct ieee80211_local
*local
= hw_to_local(hw
);
260 lockdep_assert_held(&local
->mtx
);
263 * It's ok to abort a not-yet-running scan (that
264 * we have one at all will be verified by checking
265 * local->scan_req next), but not to complete it
268 if (WARN_ON(!local
->scanning
&& !aborted
))
271 if (WARN_ON(!local
->scan_req
))
274 if (was_hw_scan
&& !aborted
&& ieee80211_prep_hw_scan(local
)) {
275 int rc
= drv_hw_scan(local
, local
->scan_sdata
, local
->hw_scan_req
);
280 kfree(local
->hw_scan_req
);
281 local
->hw_scan_req
= NULL
;
283 if (local
->scan_req
!= local
->int_scan_req
)
284 cfg80211_scan_done(local
->scan_req
, aborted
);
285 local
->scan_req
= NULL
;
286 local
->scan_sdata
= NULL
;
289 local
->scan_channel
= NULL
;
291 ieee80211_hw_config(local
, IEEE80211_CONF_CHANGE_CHANNEL
);
293 ieee80211_configure_filter(local
);
294 drv_sw_scan_complete(local
);
295 ieee80211_offchannel_return(local
, true);
298 ieee80211_recalc_idle(local
);
300 ieee80211_mlme_notify_scan_completed(local
);
301 ieee80211_ibss_notify_scan_completed(local
);
302 ieee80211_mesh_notify_scan_completed(local
);
303 ieee80211_queue_work(&local
->hw
, &local
->work_work
);
306 void ieee80211_scan_completed(struct ieee80211_hw
*hw
, bool aborted
)
308 struct ieee80211_local
*local
= hw_to_local(hw
);
310 trace_api_scan_completed(local
, aborted
);
312 set_bit(SCAN_COMPLETED
, &local
->scanning
);
314 set_bit(SCAN_ABORTED
, &local
->scanning
);
315 ieee80211_queue_delayed_work(&local
->hw
, &local
->scan_work
, 0);
317 EXPORT_SYMBOL(ieee80211_scan_completed
);
319 static int ieee80211_start_sw_scan(struct ieee80211_local
*local
)
322 * Hardware/driver doesn't support hw_scan, so use software
323 * scanning instead. First send a nullfunc frame with power save
324 * bit on so that AP will buffer the frames for us while we are not
325 * listening, then send probe requests to each channel and wait for
326 * the responses. After all channels are scanned, tune back to the
327 * original channel and send a nullfunc frame with power save bit
328 * off to trigger the AP to send us all the buffered frames.
330 * Note that while local->sw_scanning is true everything else but
331 * nullfunc frames and probe requests will be dropped in
332 * ieee80211_tx_h_check_assoc().
334 drv_sw_scan_start(local
);
336 ieee80211_offchannel_stop_beaconing(local
);
338 local
->leave_oper_channel_time
= 0;
339 local
->next_scan_state
= SCAN_DECISION
;
340 local
->scan_channel_idx
= 0;
342 drv_flush(local
, false);
344 ieee80211_configure_filter(local
);
346 /* We need to set power level at maximum rate for scanning. */
347 ieee80211_hw_config(local
, 0);
349 ieee80211_queue_delayed_work(&local
->hw
,
351 IEEE80211_CHANNEL_TIME
);
357 static int __ieee80211_start_scan(struct ieee80211_sub_if_data
*sdata
,
358 struct cfg80211_scan_request
*req
)
360 struct ieee80211_local
*local
= sdata
->local
;
363 lockdep_assert_held(&local
->mtx
);
368 if (!list_empty(&local
->work_list
)) {
369 /* wait for the work to finish/time out */
370 local
->scan_req
= req
;
371 local
->scan_sdata
= sdata
;
375 if (local
->ops
->hw_scan
) {
378 local
->hw_scan_req
= kmalloc(
379 sizeof(*local
->hw_scan_req
) +
380 req
->n_channels
* sizeof(req
->channels
[0]) +
381 2 + IEEE80211_MAX_SSID_LEN
+ local
->scan_ies_len
+
382 req
->ie_len
, GFP_KERNEL
);
383 if (!local
->hw_scan_req
)
386 local
->hw_scan_req
->ssids
= req
->ssids
;
387 local
->hw_scan_req
->n_ssids
= req
->n_ssids
;
388 ies
= (u8
*)local
->hw_scan_req
+
389 sizeof(*local
->hw_scan_req
) +
390 req
->n_channels
* sizeof(req
->channels
[0]);
391 local
->hw_scan_req
->ie
= ies
;
393 local
->hw_scan_band
= 0;
396 * After allocating local->hw_scan_req, we must
397 * go through until ieee80211_prep_hw_scan(), so
398 * anything that might be changed here and leave
399 * this function early must not go after this
404 local
->scan_req
= req
;
405 local
->scan_sdata
= sdata
;
407 if (local
->ops
->hw_scan
)
408 __set_bit(SCAN_HW_SCANNING
, &local
->scanning
);
410 __set_bit(SCAN_SW_SCANNING
, &local
->scanning
);
412 ieee80211_recalc_idle(local
);
414 if (local
->ops
->hw_scan
) {
415 WARN_ON(!ieee80211_prep_hw_scan(local
));
416 rc
= drv_hw_scan(local
, sdata
, local
->hw_scan_req
);
418 rc
= ieee80211_start_sw_scan(local
);
421 kfree(local
->hw_scan_req
);
422 local
->hw_scan_req
= NULL
;
425 ieee80211_recalc_idle(local
);
427 local
->scan_req
= NULL
;
428 local
->scan_sdata
= NULL
;
435 ieee80211_scan_get_channel_time(struct ieee80211_channel
*chan
)
438 * TODO: channel switching also consumes quite some time,
439 * add that delay as well to get a better estimation
441 if (chan
->flags
& IEEE80211_CHAN_PASSIVE_SCAN
)
442 return IEEE80211_PASSIVE_CHANNEL_TIME
;
443 return IEEE80211_PROBE_DELAY
+ IEEE80211_CHANNEL_TIME
;
446 static void ieee80211_scan_state_decision(struct ieee80211_local
*local
,
447 unsigned long *next_delay
)
449 bool associated
= false;
450 bool tx_empty
= true;
452 bool listen_int_exceeded
;
453 unsigned long min_beacon_int
= 0;
454 struct ieee80211_sub_if_data
*sdata
;
455 struct ieee80211_channel
*next_chan
;
458 * check if at least one STA interface is associated,
459 * check if at least one STA interface has pending tx frames
460 * and grab the lowest used beacon interval
462 mutex_lock(&local
->iflist_mtx
);
463 list_for_each_entry(sdata
, &local
->interfaces
, list
) {
464 if (!ieee80211_sdata_running(sdata
))
467 if (sdata
->vif
.type
== NL80211_IFTYPE_STATION
) {
468 if (sdata
->u
.mgd
.associated
) {
471 if (sdata
->vif
.bss_conf
.beacon_int
<
472 min_beacon_int
|| min_beacon_int
== 0)
474 sdata
->vif
.bss_conf
.beacon_int
;
476 if (!qdisc_all_tx_empty(sdata
->dev
)) {
483 mutex_unlock(&local
->iflist_mtx
);
485 if (local
->scan_channel
) {
487 * we're currently scanning a different channel, let's
488 * see if we can scan another channel without interfering
489 * with the current traffic situation.
491 * Since we don't know if the AP has pending frames for us
492 * we can only check for our tx queues and use the current
493 * pm_qos requirements for rx. Hence, if no tx traffic occurs
494 * at all we will scan as many channels in a row as the pm_qos
495 * latency allows us to. Additionally we also check for the
496 * currently negotiated listen interval to prevent losing
497 * frames unnecessarily.
499 * Otherwise switch back to the operating channel.
501 next_chan
= local
->scan_req
->channels
[local
->scan_channel_idx
];
503 bad_latency
= time_after(jiffies
+
504 ieee80211_scan_get_channel_time(next_chan
),
505 local
->leave_oper_channel_time
+
506 usecs_to_jiffies(pm_qos_request(PM_QOS_NETWORK_LATENCY
)));
508 listen_int_exceeded
= time_after(jiffies
+
509 ieee80211_scan_get_channel_time(next_chan
),
510 local
->leave_oper_channel_time
+
511 usecs_to_jiffies(min_beacon_int
* 1024) *
512 local
->hw
.conf
.listen_interval
);
514 if (associated
&& ( !tx_empty
|| bad_latency
||
515 listen_int_exceeded
))
516 local
->next_scan_state
= SCAN_ENTER_OPER_CHANNEL
;
518 local
->next_scan_state
= SCAN_SET_CHANNEL
;
521 * we're on the operating channel currently, let's
522 * leave that channel now to scan another one
524 local
->next_scan_state
= SCAN_LEAVE_OPER_CHANNEL
;
530 static void ieee80211_scan_state_leave_oper_channel(struct ieee80211_local
*local
,
531 unsigned long *next_delay
)
533 ieee80211_offchannel_stop_station(local
);
535 __set_bit(SCAN_OFF_CHANNEL
, &local
->scanning
);
538 * What if the nullfunc frames didn't arrive?
540 drv_flush(local
, false);
541 if (local
->ops
->flush
)
544 *next_delay
= HZ
/ 10;
546 /* remember when we left the operating channel */
547 local
->leave_oper_channel_time
= jiffies
;
549 /* advance to the next channel to be scanned */
550 local
->next_scan_state
= SCAN_SET_CHANNEL
;
553 static void ieee80211_scan_state_enter_oper_channel(struct ieee80211_local
*local
,
554 unsigned long *next_delay
)
556 /* switch back to the operating channel */
557 local
->scan_channel
= NULL
;
558 ieee80211_hw_config(local
, IEEE80211_CONF_CHANGE_CHANNEL
);
561 * Only re-enable station mode interface now; beaconing will be
562 * re-enabled once the full scan has been completed.
564 ieee80211_offchannel_return(local
, false);
566 __clear_bit(SCAN_OFF_CHANNEL
, &local
->scanning
);
568 *next_delay
= HZ
/ 5;
569 local
->next_scan_state
= SCAN_DECISION
;
572 static void ieee80211_scan_state_set_channel(struct ieee80211_local
*local
,
573 unsigned long *next_delay
)
576 struct ieee80211_channel
*chan
;
579 chan
= local
->scan_req
->channels
[local
->scan_channel_idx
];
581 local
->scan_channel
= chan
;
583 /* Only call hw-config if we really need to change channels. */
584 if (chan
!= local
->hw
.conf
.channel
)
585 if (ieee80211_hw_config(local
, IEEE80211_CONF_CHANGE_CHANNEL
))
588 /* advance state machine to next channel/band */
589 local
->scan_channel_idx
++;
592 /* if we skip this channel return to the decision state */
593 local
->next_scan_state
= SCAN_DECISION
;
598 * Probe delay is used to update the NAV, cf. 11.1.3.2.2
599 * (which unfortunately doesn't say _why_ step a) is done,
600 * but it waits for the probe delay or until a frame is
601 * received - and the received frame would update the NAV).
602 * For now, we do not support waiting until a frame is
605 * In any case, it is not necessary for a passive scan.
607 if (chan
->flags
& IEEE80211_CHAN_PASSIVE_SCAN
||
608 !local
->scan_req
->n_ssids
) {
609 *next_delay
= IEEE80211_PASSIVE_CHANNEL_TIME
;
610 local
->next_scan_state
= SCAN_DECISION
;
614 /* active scan, send probes */
615 *next_delay
= IEEE80211_PROBE_DELAY
;
616 local
->next_scan_state
= SCAN_SEND_PROBE
;
619 static void ieee80211_scan_state_send_probe(struct ieee80211_local
*local
,
620 unsigned long *next_delay
)
623 struct ieee80211_sub_if_data
*sdata
= local
->scan_sdata
;
624 enum ieee80211_band band
= local
->hw
.conf
.channel
->band
;
626 for (i
= 0; i
< local
->scan_req
->n_ssids
; i
++)
627 ieee80211_send_probe_req(
629 local
->scan_req
->ssids
[i
].ssid
,
630 local
->scan_req
->ssids
[i
].ssid_len
,
631 local
->scan_req
->ie
, local
->scan_req
->ie_len
,
632 local
->scan_req
->rates
[band
], false,
633 local
->scan_req
->no_cck
);
636 * After sending probe requests, wait for probe responses
639 *next_delay
= IEEE80211_CHANNEL_TIME
;
640 local
->next_scan_state
= SCAN_DECISION
;
643 void ieee80211_scan_work(struct work_struct
*work
)
645 struct ieee80211_local
*local
=
646 container_of(work
, struct ieee80211_local
, scan_work
.work
);
647 struct ieee80211_sub_if_data
*sdata
;
648 unsigned long next_delay
= 0;
649 bool aborted
, hw_scan
;
651 mutex_lock(&local
->mtx
);
653 sdata
= local
->scan_sdata
;
655 if (test_and_clear_bit(SCAN_COMPLETED
, &local
->scanning
)) {
656 aborted
= test_and_clear_bit(SCAN_ABORTED
, &local
->scanning
);
660 if (!sdata
|| !local
->scan_req
)
663 if (local
->scan_req
&& !local
->scanning
) {
664 struct cfg80211_scan_request
*req
= local
->scan_req
;
667 local
->scan_req
= NULL
;
668 local
->scan_sdata
= NULL
;
670 rc
= __ieee80211_start_scan(sdata
, req
);
672 /* need to complete scan in cfg80211 */
673 local
->scan_req
= req
;
681 * Avoid re-scheduling when the sdata is going away.
683 if (!ieee80211_sdata_running(sdata
)) {
689 * as long as no delay is required advance immediately
690 * without scheduling a new work
693 if (!ieee80211_sdata_running(sdata
)) {
698 switch (local
->next_scan_state
) {
700 /* if no more bands/channels left, complete scan */
701 if (local
->scan_channel_idx
>= local
->scan_req
->n_channels
) {
705 ieee80211_scan_state_decision(local
, &next_delay
);
707 case SCAN_SET_CHANNEL
:
708 ieee80211_scan_state_set_channel(local
, &next_delay
);
710 case SCAN_SEND_PROBE
:
711 ieee80211_scan_state_send_probe(local
, &next_delay
);
713 case SCAN_LEAVE_OPER_CHANNEL
:
714 ieee80211_scan_state_leave_oper_channel(local
, &next_delay
);
716 case SCAN_ENTER_OPER_CHANNEL
:
717 ieee80211_scan_state_enter_oper_channel(local
, &next_delay
);
720 } while (next_delay
== 0);
722 ieee80211_queue_delayed_work(&local
->hw
, &local
->scan_work
, next_delay
);
726 hw_scan
= test_bit(SCAN_HW_SCANNING
, &local
->scanning
);
727 __ieee80211_scan_completed(&local
->hw
, aborted
, hw_scan
);
729 mutex_unlock(&local
->mtx
);
732 int ieee80211_request_scan(struct ieee80211_sub_if_data
*sdata
,
733 struct cfg80211_scan_request
*req
)
737 mutex_lock(&sdata
->local
->mtx
);
738 res
= __ieee80211_start_scan(sdata
, req
);
739 mutex_unlock(&sdata
->local
->mtx
);
744 int ieee80211_request_internal_scan(struct ieee80211_sub_if_data
*sdata
,
745 const u8
*ssid
, u8 ssid_len
,
746 struct ieee80211_channel
*chan
)
748 struct ieee80211_local
*local
= sdata
->local
;
750 enum ieee80211_band band
;
752 mutex_lock(&local
->mtx
);
758 /* fill internal scan request */
762 for (band
= 0; band
< IEEE80211_NUM_BANDS
; band
++) {
763 if (!local
->hw
.wiphy
->bands
[band
])
766 i
< local
->hw
.wiphy
->bands
[band
]->n_channels
;
768 local
->int_scan_req
->channels
[nchan
] =
769 &local
->hw
.wiphy
->bands
[band
]->channels
[i
];
774 local
->int_scan_req
->n_channels
= nchan
;
776 local
->int_scan_req
->channels
[0] = chan
;
777 local
->int_scan_req
->n_channels
= 1;
780 local
->int_scan_req
->ssids
= &local
->scan_ssid
;
781 local
->int_scan_req
->n_ssids
= 1;
782 memcpy(local
->int_scan_req
->ssids
[0].ssid
, ssid
, IEEE80211_MAX_SSID_LEN
);
783 local
->int_scan_req
->ssids
[0].ssid_len
= ssid_len
;
785 ret
= __ieee80211_start_scan(sdata
, sdata
->local
->int_scan_req
);
787 mutex_unlock(&local
->mtx
);
792 * Only call this function when a scan can't be queued -- under RTNL.
794 void ieee80211_scan_cancel(struct ieee80211_local
*local
)
797 * We are canceling software scan, or deferred scan that was not
798 * yet really started (see __ieee80211_start_scan ).
800 * Regarding hardware scan:
801 * - we can not call __ieee80211_scan_completed() as when
802 * SCAN_HW_SCANNING bit is set this function change
803 * local->hw_scan_req to operate on 5G band, what race with
804 * driver which can use local->hw_scan_req
806 * - we can not cancel scan_work since driver can schedule it
807 * by ieee80211_scan_completed(..., true) to finish scan
809 * Hence we only call the cancel_hw_scan() callback, but the low-level
810 * driver is still responsible for calling ieee80211_scan_completed()
811 * after the scan was completed/aborted.
814 mutex_lock(&local
->mtx
);
815 if (!local
->scan_req
)
818 if (test_bit(SCAN_HW_SCANNING
, &local
->scanning
)) {
819 if (local
->ops
->cancel_hw_scan
)
820 drv_cancel_hw_scan(local
, local
->scan_sdata
);
825 * If the work is currently running, it must be blocked on
826 * the mutex, but we'll set scan_sdata = NULL and it'll
827 * simply exit once it acquires the mutex.
829 cancel_delayed_work(&local
->scan_work
);
831 __ieee80211_scan_completed(&local
->hw
, true, false);
833 mutex_unlock(&local
->mtx
);
836 int ieee80211_request_sched_scan_start(struct ieee80211_sub_if_data
*sdata
,
837 struct cfg80211_sched_scan_request
*req
)
839 struct ieee80211_local
*local
= sdata
->local
;
842 mutex_lock(&sdata
->local
->mtx
);
844 if (local
->sched_scanning
) {
849 if (!local
->ops
->sched_scan_start
) {
854 for (i
= 0; i
< IEEE80211_NUM_BANDS
; i
++) {
855 local
->sched_scan_ies
.ie
[i
] = kzalloc(2 +
856 IEEE80211_MAX_SSID_LEN
+
857 local
->scan_ies_len
+
860 if (!local
->sched_scan_ies
.ie
[i
]) {
865 local
->sched_scan_ies
.len
[i
] =
866 ieee80211_build_preq_ies(local
,
867 local
->sched_scan_ies
.ie
[i
],
868 req
->ie
, req
->ie_len
, i
,
872 ret
= drv_sched_scan_start(local
, sdata
, req
,
873 &local
->sched_scan_ies
);
875 local
->sched_scanning
= true;
881 kfree(local
->sched_scan_ies
.ie
[--i
]);
883 mutex_unlock(&sdata
->local
->mtx
);
887 int ieee80211_request_sched_scan_stop(struct ieee80211_sub_if_data
*sdata
)
889 struct ieee80211_local
*local
= sdata
->local
;
892 mutex_lock(&sdata
->local
->mtx
);
894 if (!local
->ops
->sched_scan_stop
) {
899 if (local
->sched_scanning
) {
900 for (i
= 0; i
< IEEE80211_NUM_BANDS
; i
++)
901 kfree(local
->sched_scan_ies
.ie
[i
]);
903 drv_sched_scan_stop(local
, sdata
);
904 local
->sched_scanning
= false;
907 mutex_unlock(&sdata
->local
->mtx
);
912 void ieee80211_sched_scan_results(struct ieee80211_hw
*hw
)
914 struct ieee80211_local
*local
= hw_to_local(hw
);
916 trace_api_sched_scan_results(local
);
918 cfg80211_sched_scan_results(hw
->wiphy
);
920 EXPORT_SYMBOL(ieee80211_sched_scan_results
);
922 void ieee80211_sched_scan_stopped_work(struct work_struct
*work
)
924 struct ieee80211_local
*local
=
925 container_of(work
, struct ieee80211_local
,
926 sched_scan_stopped_work
);
929 mutex_lock(&local
->mtx
);
931 if (!local
->sched_scanning
) {
932 mutex_unlock(&local
->mtx
);
936 for (i
= 0; i
< IEEE80211_NUM_BANDS
; i
++)
937 kfree(local
->sched_scan_ies
.ie
[i
]);
939 local
->sched_scanning
= false;
941 mutex_unlock(&local
->mtx
);
943 cfg80211_sched_scan_stopped(local
->hw
.wiphy
);
946 void ieee80211_sched_scan_stopped(struct ieee80211_hw
*hw
)
948 struct ieee80211_local
*local
= hw_to_local(hw
);
950 trace_api_sched_scan_stopped(local
);
952 ieee80211_queue_work(&local
->hw
, &local
->sched_scan_stopped_work
);
954 EXPORT_SYMBOL(ieee80211_sched_scan_stopped
);