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/etherdevice.h>
17 #include <linux/rtnetlink.h>
18 #include <linux/pm_qos.h>
19 #include <net/sch_generic.h>
20 #include <linux/slab.h>
21 #include <linux/export.h>
22 #include <net/mac80211.h>
24 #include "ieee80211_i.h"
25 #include "driver-ops.h"
28 #define IEEE80211_PROBE_DELAY (HZ / 33)
29 #define IEEE80211_CHANNEL_TIME (HZ / 33)
30 #define IEEE80211_PASSIVE_CHANNEL_TIME (HZ / 9)
32 void ieee80211_rx_bss_put(struct ieee80211_local
*local
,
33 struct ieee80211_bss
*bss
)
37 cfg80211_put_bss(local
->hw
.wiphy
,
38 container_of((void *)bss
, struct cfg80211_bss
, priv
));
41 static bool is_uapsd_supported(struct ieee802_11_elems
*elems
)
45 if (elems
->wmm_info
&& elems
->wmm_info_len
== 7
46 && elems
->wmm_info
[5] == 1)
47 qos_info
= elems
->wmm_info
[6];
48 else if (elems
->wmm_param
&& elems
->wmm_param_len
== 24
49 && elems
->wmm_param
[5] == 1)
50 qos_info
= elems
->wmm_param
[6];
52 /* no valid wmm information or parameter element found */
55 return qos_info
& IEEE80211_WMM_IE_AP_QOSINFO_UAPSD
;
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
, size_t len
,
62 struct ieee802_11_elems
*elems
,
63 struct ieee80211_channel
*channel
)
65 bool beacon
= ieee80211_is_beacon(mgmt
->frame_control
);
66 struct cfg80211_bss
*cbss
;
67 struct ieee80211_bss
*bss
;
71 if (local
->hw
.flags
& IEEE80211_HW_SIGNAL_DBM
)
72 signal
= rx_status
->signal
* 100;
73 else if (local
->hw
.flags
& IEEE80211_HW_SIGNAL_UNSPEC
)
74 signal
= (rx_status
->signal
* 100) / local
->hw
.max_signal
;
76 cbss
= cfg80211_inform_bss_frame(local
->hw
.wiphy
, channel
,
77 mgmt
, len
, signal
, GFP_ATOMIC
);
81 bss
= (void *)cbss
->priv
;
84 bss
->device_ts_beacon
= rx_status
->device_timestamp
;
86 bss
->device_ts_presp
= rx_status
->device_timestamp
;
88 if (elems
->parse_error
) {
90 bss
->corrupt_data
|= IEEE80211_BSS_CORRUPT_BEACON
;
92 bss
->corrupt_data
|= IEEE80211_BSS_CORRUPT_PROBE_RESP
;
95 bss
->corrupt_data
&= ~IEEE80211_BSS_CORRUPT_BEACON
;
97 bss
->corrupt_data
&= ~IEEE80211_BSS_CORRUPT_PROBE_RESP
;
100 /* save the ERP value so that it is available at association time */
101 if (elems
->erp_info
&& (!elems
->parse_error
||
102 !(bss
->valid_data
& IEEE80211_BSS_VALID_ERP
))) {
103 bss
->erp_value
= elems
->erp_info
[0];
104 bss
->has_erp_value
= true;
105 if (!elems
->parse_error
)
106 bss
->valid_data
|= IEEE80211_BSS_VALID_ERP
;
109 /* replace old supported rates if we get new values */
110 if (!elems
->parse_error
||
111 !(bss
->valid_data
& IEEE80211_BSS_VALID_RATES
)) {
113 if (elems
->supp_rates
) {
114 clen
= IEEE80211_MAX_SUPP_RATES
;
115 if (clen
> elems
->supp_rates_len
)
116 clen
= elems
->supp_rates_len
;
117 memcpy(bss
->supp_rates
, elems
->supp_rates
, clen
);
120 if (elems
->ext_supp_rates
) {
121 clen
= IEEE80211_MAX_SUPP_RATES
- srlen
;
122 if (clen
> elems
->ext_supp_rates_len
)
123 clen
= elems
->ext_supp_rates_len
;
124 memcpy(bss
->supp_rates
+ srlen
, elems
->ext_supp_rates
,
129 bss
->supp_rates_len
= srlen
;
130 if (!elems
->parse_error
)
131 bss
->valid_data
|= IEEE80211_BSS_VALID_RATES
;
135 if (!elems
->parse_error
||
136 !(bss
->valid_data
& IEEE80211_BSS_VALID_WMM
)) {
137 bss
->wmm_used
= elems
->wmm_param
|| elems
->wmm_info
;
138 bss
->uapsd_supported
= is_uapsd_supported(elems
);
139 if (!elems
->parse_error
)
140 bss
->valid_data
|= IEEE80211_BSS_VALID_WMM
;
146 void ieee80211_scan_rx(struct ieee80211_local
*local
, struct sk_buff
*skb
)
148 struct ieee80211_rx_status
*rx_status
= IEEE80211_SKB_RXCB(skb
);
149 struct ieee80211_sub_if_data
*sdata1
, *sdata2
;
150 struct ieee80211_mgmt
*mgmt
= (void *)skb
->data
;
151 struct ieee80211_bss
*bss
;
153 struct ieee80211_channel
*channel
;
155 struct ieee802_11_elems elems
;
158 (!ieee80211_is_probe_resp(mgmt
->frame_control
) &&
159 !ieee80211_is_beacon(mgmt
->frame_control
)))
162 sdata1
= rcu_dereference(local
->scan_sdata
);
163 sdata2
= rcu_dereference(local
->sched_scan_sdata
);
165 if (likely(!sdata1
&& !sdata2
))
168 if (ieee80211_is_probe_resp(mgmt
->frame_control
)) {
169 /* ignore ProbeResp to foreign address */
170 if ((!sdata1
|| !ether_addr_equal(mgmt
->da
, sdata1
->vif
.addr
)) &&
171 (!sdata2
|| !ether_addr_equal(mgmt
->da
, sdata2
->vif
.addr
)))
174 elements
= mgmt
->u
.probe_resp
.variable
;
175 baselen
= offsetof(struct ieee80211_mgmt
, u
.probe_resp
.variable
);
177 baselen
= offsetof(struct ieee80211_mgmt
, u
.beacon
.variable
);
178 elements
= mgmt
->u
.beacon
.variable
;
181 if (baselen
> skb
->len
)
184 ieee802_11_parse_elems(elements
, skb
->len
- baselen
, false, &elems
);
186 channel
= ieee80211_get_channel(local
->hw
.wiphy
, rx_status
->freq
);
188 if (!channel
|| channel
->flags
& IEEE80211_CHAN_DISABLED
)
191 bss
= ieee80211_bss_info_update(local
, rx_status
,
192 mgmt
, skb
->len
, &elems
,
195 ieee80211_rx_bss_put(local
, bss
);
198 /* return false if no more work */
199 static bool ieee80211_prep_hw_scan(struct ieee80211_local
*local
)
201 struct cfg80211_scan_request
*req
= local
->scan_req
;
202 enum ieee80211_band band
;
203 int i
, ielen
, n_chans
;
205 if (test_bit(SCAN_HW_CANCELLED
, &local
->scanning
))
209 if (local
->hw_scan_band
== IEEE80211_NUM_BANDS
)
212 band
= local
->hw_scan_band
;
214 for (i
= 0; i
< req
->n_channels
; i
++) {
215 if (req
->channels
[i
]->band
== band
) {
216 local
->hw_scan_req
->channels
[n_chans
] =
222 local
->hw_scan_band
++;
225 local
->hw_scan_req
->n_channels
= n_chans
;
227 ielen
= ieee80211_build_preq_ies(local
, (u8
*)local
->hw_scan_req
->ie
,
228 local
->hw_scan_ies_bufsize
,
229 req
->ie
, req
->ie_len
, band
,
230 req
->rates
[band
], 0);
231 local
->hw_scan_req
->ie_len
= ielen
;
232 local
->hw_scan_req
->no_cck
= req
->no_cck
;
237 static void __ieee80211_scan_completed(struct ieee80211_hw
*hw
, bool aborted
,
240 struct ieee80211_local
*local
= hw_to_local(hw
);
242 lockdep_assert_held(&local
->mtx
);
245 * It's ok to abort a not-yet-running scan (that
246 * we have one at all will be verified by checking
247 * local->scan_req next), but not to complete it
250 if (WARN_ON(!local
->scanning
&& !aborted
))
253 if (WARN_ON(!local
->scan_req
))
256 if (was_hw_scan
&& !aborted
&& ieee80211_prep_hw_scan(local
)) {
259 rc
= drv_hw_scan(local
,
260 rcu_dereference_protected(local
->scan_sdata
,
261 lockdep_is_held(&local
->mtx
)),
268 kfree(local
->hw_scan_req
);
269 local
->hw_scan_req
= NULL
;
271 if (local
->scan_req
!= local
->int_scan_req
)
272 cfg80211_scan_done(local
->scan_req
, aborted
);
273 local
->scan_req
= NULL
;
274 rcu_assign_pointer(local
->scan_sdata
, NULL
);
277 local
->scan_channel
= NULL
;
279 /* Set power back to normal operating levels. */
280 ieee80211_hw_config(local
, 0);
283 ieee80211_configure_filter(local
);
284 drv_sw_scan_complete(local
);
285 ieee80211_offchannel_return(local
);
288 ieee80211_recalc_idle(local
);
290 ieee80211_mlme_notify_scan_completed(local
);
291 ieee80211_ibss_notify_scan_completed(local
);
292 ieee80211_mesh_notify_scan_completed(local
);
293 ieee80211_start_next_roc(local
);
296 void ieee80211_scan_completed(struct ieee80211_hw
*hw
, bool aborted
)
298 struct ieee80211_local
*local
= hw_to_local(hw
);
300 trace_api_scan_completed(local
, aborted
);
302 set_bit(SCAN_COMPLETED
, &local
->scanning
);
304 set_bit(SCAN_ABORTED
, &local
->scanning
);
305 ieee80211_queue_delayed_work(&local
->hw
, &local
->scan_work
, 0);
307 EXPORT_SYMBOL(ieee80211_scan_completed
);
309 static int ieee80211_start_sw_scan(struct ieee80211_local
*local
)
311 /* Software scan is not supported in multi-channel cases */
312 if (local
->use_chanctx
)
316 * Hardware/driver doesn't support hw_scan, so use software
317 * scanning instead. First send a nullfunc frame with power save
318 * bit on so that AP will buffer the frames for us while we are not
319 * listening, then send probe requests to each channel and wait for
320 * the responses. After all channels are scanned, tune back to the
321 * original channel and send a nullfunc frame with power save bit
322 * off to trigger the AP to send us all the buffered frames.
324 * Note that while local->sw_scanning is true everything else but
325 * nullfunc frames and probe requests will be dropped in
326 * ieee80211_tx_h_check_assoc().
328 drv_sw_scan_start(local
);
330 local
->leave_oper_channel_time
= jiffies
;
331 local
->next_scan_state
= SCAN_DECISION
;
332 local
->scan_channel_idx
= 0;
334 ieee80211_offchannel_stop_vifs(local
);
336 /* ensure nullfunc is transmitted before leaving operating channel */
337 ieee80211_flush_queues(local
, NULL
);
339 ieee80211_configure_filter(local
);
341 /* We need to set power level at maximum rate for scanning. */
342 ieee80211_hw_config(local
, 0);
344 ieee80211_queue_delayed_work(&local
->hw
,
345 &local
->scan_work
, 0);
350 static bool ieee80211_can_scan(struct ieee80211_local
*local
,
351 struct ieee80211_sub_if_data
*sdata
)
353 if (local
->radar_detect_enabled
)
356 if (!list_empty(&local
->roc_list
))
359 if (sdata
->vif
.type
== NL80211_IFTYPE_STATION
&&
360 sdata
->u
.mgd
.flags
& (IEEE80211_STA_BEACON_POLL
|
361 IEEE80211_STA_CONNECTION_POLL
))
367 void ieee80211_run_deferred_scan(struct ieee80211_local
*local
)
369 lockdep_assert_held(&local
->mtx
);
371 if (!local
->scan_req
|| local
->scanning
)
374 if (!ieee80211_can_scan(local
,
375 rcu_dereference_protected(
377 lockdep_is_held(&local
->mtx
))))
380 ieee80211_queue_delayed_work(&local
->hw
, &local
->scan_work
,
381 round_jiffies_relative(0));
384 static void ieee80211_scan_state_send_probe(struct ieee80211_local
*local
,
385 unsigned long *next_delay
)
388 struct ieee80211_sub_if_data
*sdata
;
389 enum ieee80211_band band
= local
->hw
.conf
.chandef
.chan
->band
;
392 tx_flags
= IEEE80211_TX_INTFL_OFFCHAN_TX_OK
;
393 if (local
->scan_req
->no_cck
)
394 tx_flags
|= IEEE80211_TX_CTL_NO_CCK_RATE
;
396 sdata
= rcu_dereference_protected(local
->scan_sdata
,
397 lockdep_is_held(&local
->mtx
));
399 for (i
= 0; i
< local
->scan_req
->n_ssids
; i
++)
400 ieee80211_send_probe_req(
402 local
->scan_req
->ssids
[i
].ssid
,
403 local
->scan_req
->ssids
[i
].ssid_len
,
404 local
->scan_req
->ie
, local
->scan_req
->ie_len
,
405 local
->scan_req
->rates
[band
], false,
406 tx_flags
, local
->hw
.conf
.chandef
.chan
, true);
409 * After sending probe requests, wait for probe responses
412 *next_delay
= IEEE80211_CHANNEL_TIME
;
413 local
->next_scan_state
= SCAN_DECISION
;
416 static int __ieee80211_start_scan(struct ieee80211_sub_if_data
*sdata
,
417 struct cfg80211_scan_request
*req
)
419 struct ieee80211_local
*local
= sdata
->local
;
422 lockdep_assert_held(&local
->mtx
);
427 if (!ieee80211_can_scan(local
, sdata
)) {
428 /* wait for the work to finish/time out */
429 local
->scan_req
= req
;
430 rcu_assign_pointer(local
->scan_sdata
, sdata
);
434 if (local
->ops
->hw_scan
) {
437 local
->hw_scan_ies_bufsize
= 2 + IEEE80211_MAX_SSID_LEN
+
438 local
->scan_ies_len
+
440 local
->hw_scan_req
= kmalloc(
441 sizeof(*local
->hw_scan_req
) +
442 req
->n_channels
* sizeof(req
->channels
[0]) +
443 local
->hw_scan_ies_bufsize
, GFP_KERNEL
);
444 if (!local
->hw_scan_req
)
447 local
->hw_scan_req
->ssids
= req
->ssids
;
448 local
->hw_scan_req
->n_ssids
= req
->n_ssids
;
449 ies
= (u8
*)local
->hw_scan_req
+
450 sizeof(*local
->hw_scan_req
) +
451 req
->n_channels
* sizeof(req
->channels
[0]);
452 local
->hw_scan_req
->ie
= ies
;
453 local
->hw_scan_req
->flags
= req
->flags
;
455 local
->hw_scan_band
= 0;
458 * After allocating local->hw_scan_req, we must
459 * go through until ieee80211_prep_hw_scan(), so
460 * anything that might be changed here and leave
461 * this function early must not go after this
466 local
->scan_req
= req
;
467 rcu_assign_pointer(local
->scan_sdata
, sdata
);
469 if (local
->ops
->hw_scan
) {
470 __set_bit(SCAN_HW_SCANNING
, &local
->scanning
);
471 } else if ((req
->n_channels
== 1) &&
472 (req
->channels
[0] == local
->_oper_chandef
.chan
)) {
474 * If we are scanning only on the operating channel
475 * then we do not need to stop normal activities
477 unsigned long next_delay
;
479 __set_bit(SCAN_ONCHANNEL_SCANNING
, &local
->scanning
);
481 ieee80211_recalc_idle(local
);
483 /* Notify driver scan is starting, keep order of operations
484 * same as normal software scan, in case that matters. */
485 drv_sw_scan_start(local
);
487 ieee80211_configure_filter(local
); /* accept probe-responses */
489 /* We need to ensure power level is at max for scanning. */
490 ieee80211_hw_config(local
, 0);
492 if ((req
->channels
[0]->flags
&
493 IEEE80211_CHAN_PASSIVE_SCAN
) ||
494 !local
->scan_req
->n_ssids
) {
495 next_delay
= IEEE80211_PASSIVE_CHANNEL_TIME
;
497 ieee80211_scan_state_send_probe(local
, &next_delay
);
498 next_delay
= IEEE80211_CHANNEL_TIME
;
501 /* Now, just wait a bit and we are all done! */
502 ieee80211_queue_delayed_work(&local
->hw
, &local
->scan_work
,
506 /* Do normal software scan */
507 __set_bit(SCAN_SW_SCANNING
, &local
->scanning
);
510 ieee80211_recalc_idle(local
);
512 if (local
->ops
->hw_scan
) {
513 WARN_ON(!ieee80211_prep_hw_scan(local
));
514 rc
= drv_hw_scan(local
, sdata
, local
->hw_scan_req
);
516 rc
= ieee80211_start_sw_scan(local
);
519 kfree(local
->hw_scan_req
);
520 local
->hw_scan_req
= NULL
;
523 ieee80211_recalc_idle(local
);
525 local
->scan_req
= NULL
;
526 rcu_assign_pointer(local
->scan_sdata
, NULL
);
533 ieee80211_scan_get_channel_time(struct ieee80211_channel
*chan
)
536 * TODO: channel switching also consumes quite some time,
537 * add that delay as well to get a better estimation
539 if (chan
->flags
& IEEE80211_CHAN_PASSIVE_SCAN
)
540 return IEEE80211_PASSIVE_CHANNEL_TIME
;
541 return IEEE80211_PROBE_DELAY
+ IEEE80211_CHANNEL_TIME
;
544 static void ieee80211_scan_state_decision(struct ieee80211_local
*local
,
545 unsigned long *next_delay
)
547 bool associated
= false;
548 bool tx_empty
= true;
550 struct ieee80211_sub_if_data
*sdata
;
551 struct ieee80211_channel
*next_chan
;
552 enum mac80211_scan_state next_scan_state
;
555 * check if at least one STA interface is associated,
556 * check if at least one STA interface has pending tx frames
557 * and grab the lowest used beacon interval
559 mutex_lock(&local
->iflist_mtx
);
560 list_for_each_entry(sdata
, &local
->interfaces
, list
) {
561 if (!ieee80211_sdata_running(sdata
))
564 if (sdata
->vif
.type
== NL80211_IFTYPE_STATION
) {
565 if (sdata
->u
.mgd
.associated
) {
568 if (!qdisc_all_tx_empty(sdata
->dev
)) {
575 mutex_unlock(&local
->iflist_mtx
);
577 next_chan
= local
->scan_req
->channels
[local
->scan_channel_idx
];
580 * we're currently scanning a different channel, let's
581 * see if we can scan another channel without interfering
582 * with the current traffic situation.
584 * Keep good latency, do not stay off-channel more than 125 ms.
587 bad_latency
= time_after(jiffies
+
588 ieee80211_scan_get_channel_time(next_chan
),
589 local
->leave_oper_channel_time
+ HZ
/ 8);
591 if (associated
&& !tx_empty
) {
592 if (local
->scan_req
->flags
& NL80211_SCAN_FLAG_LOW_PRIORITY
)
593 next_scan_state
= SCAN_ABORT
;
595 next_scan_state
= SCAN_SUSPEND
;
596 } else if (associated
&& bad_latency
) {
597 next_scan_state
= SCAN_SUSPEND
;
599 next_scan_state
= SCAN_SET_CHANNEL
;
602 local
->next_scan_state
= next_scan_state
;
607 static void ieee80211_scan_state_set_channel(struct ieee80211_local
*local
,
608 unsigned long *next_delay
)
611 struct ieee80211_channel
*chan
;
614 chan
= local
->scan_req
->channels
[local
->scan_channel_idx
];
616 local
->scan_channel
= chan
;
618 if (ieee80211_hw_config(local
, IEEE80211_CONF_CHANGE_CHANNEL
))
621 /* advance state machine to next channel/band */
622 local
->scan_channel_idx
++;
625 /* if we skip this channel return to the decision state */
626 local
->next_scan_state
= SCAN_DECISION
;
631 * Probe delay is used to update the NAV, cf. 11.1.3.2.2
632 * (which unfortunately doesn't say _why_ step a) is done,
633 * but it waits for the probe delay or until a frame is
634 * received - and the received frame would update the NAV).
635 * For now, we do not support waiting until a frame is
638 * In any case, it is not necessary for a passive scan.
640 if (chan
->flags
& IEEE80211_CHAN_PASSIVE_SCAN
||
641 !local
->scan_req
->n_ssids
) {
642 *next_delay
= IEEE80211_PASSIVE_CHANNEL_TIME
;
643 local
->next_scan_state
= SCAN_DECISION
;
647 /* active scan, send probes */
648 *next_delay
= IEEE80211_PROBE_DELAY
;
649 local
->next_scan_state
= SCAN_SEND_PROBE
;
652 static void ieee80211_scan_state_suspend(struct ieee80211_local
*local
,
653 unsigned long *next_delay
)
655 /* switch back to the operating channel */
656 local
->scan_channel
= NULL
;
657 ieee80211_hw_config(local
, IEEE80211_CONF_CHANGE_CHANNEL
);
660 ieee80211_offchannel_return(local
);
662 *next_delay
= HZ
/ 5;
663 /* afterwards, resume scan & go to next channel */
664 local
->next_scan_state
= SCAN_RESUME
;
667 static void ieee80211_scan_state_resume(struct ieee80211_local
*local
,
668 unsigned long *next_delay
)
670 ieee80211_offchannel_stop_vifs(local
);
672 if (local
->ops
->flush
) {
673 ieee80211_flush_queues(local
, NULL
);
676 *next_delay
= HZ
/ 10;
678 /* remember when we left the operating channel */
679 local
->leave_oper_channel_time
= jiffies
;
681 /* advance to the next channel to be scanned */
682 local
->next_scan_state
= SCAN_SET_CHANNEL
;
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
;
690 unsigned long next_delay
= 0;
691 bool aborted
, hw_scan
;
693 mutex_lock(&local
->mtx
);
695 sdata
= rcu_dereference_protected(local
->scan_sdata
,
696 lockdep_is_held(&local
->mtx
));
698 /* When scanning on-channel, the first-callback means completed. */
699 if (test_bit(SCAN_ONCHANNEL_SCANNING
, &local
->scanning
)) {
700 aborted
= test_and_clear_bit(SCAN_ABORTED
, &local
->scanning
);
704 if (test_and_clear_bit(SCAN_COMPLETED
, &local
->scanning
)) {
705 aborted
= test_and_clear_bit(SCAN_ABORTED
, &local
->scanning
);
709 if (!sdata
|| !local
->scan_req
)
712 if (local
->scan_req
&& !local
->scanning
) {
713 struct cfg80211_scan_request
*req
= local
->scan_req
;
716 local
->scan_req
= NULL
;
717 rcu_assign_pointer(local
->scan_sdata
, NULL
);
719 rc
= __ieee80211_start_scan(sdata
, req
);
721 /* need to complete scan in cfg80211 */
722 local
->scan_req
= req
;
730 * Avoid re-scheduling when the sdata is going away.
732 if (!ieee80211_sdata_running(sdata
)) {
738 * as long as no delay is required advance immediately
739 * without scheduling a new work
742 if (!ieee80211_sdata_running(sdata
)) {
747 switch (local
->next_scan_state
) {
749 /* if no more bands/channels left, complete scan */
750 if (local
->scan_channel_idx
>= local
->scan_req
->n_channels
) {
754 ieee80211_scan_state_decision(local
, &next_delay
);
756 case SCAN_SET_CHANNEL
:
757 ieee80211_scan_state_set_channel(local
, &next_delay
);
759 case SCAN_SEND_PROBE
:
760 ieee80211_scan_state_send_probe(local
, &next_delay
);
763 ieee80211_scan_state_suspend(local
, &next_delay
);
766 ieee80211_scan_state_resume(local
, &next_delay
);
772 } while (next_delay
== 0);
774 ieee80211_queue_delayed_work(&local
->hw
, &local
->scan_work
, next_delay
);
778 hw_scan
= test_bit(SCAN_HW_SCANNING
, &local
->scanning
);
779 __ieee80211_scan_completed(&local
->hw
, aborted
, hw_scan
);
781 mutex_unlock(&local
->mtx
);
784 int ieee80211_request_scan(struct ieee80211_sub_if_data
*sdata
,
785 struct cfg80211_scan_request
*req
)
789 mutex_lock(&sdata
->local
->mtx
);
790 res
= __ieee80211_start_scan(sdata
, req
);
791 mutex_unlock(&sdata
->local
->mtx
);
796 int ieee80211_request_ibss_scan(struct ieee80211_sub_if_data
*sdata
,
797 const u8
*ssid
, u8 ssid_len
,
798 struct ieee80211_channel
*chan
)
800 struct ieee80211_local
*local
= sdata
->local
;
802 enum ieee80211_band band
;
804 mutex_lock(&local
->mtx
);
810 /* fill internal scan request */
815 for (band
= 0; band
< IEEE80211_NUM_BANDS
; band
++) {
816 if (!local
->hw
.wiphy
->bands
[band
])
819 max_n
= local
->hw
.wiphy
->bands
[band
]->n_channels
;
820 for (i
= 0; i
< max_n
; i
++) {
821 struct ieee80211_channel
*tmp_ch
=
822 &local
->hw
.wiphy
->bands
[band
]->channels
[i
];
824 if (tmp_ch
->flags
& (IEEE80211_CHAN_NO_IBSS
|
825 IEEE80211_CHAN_DISABLED
))
828 local
->int_scan_req
->channels
[n_ch
] = tmp_ch
;
833 if (WARN_ON_ONCE(n_ch
== 0))
836 local
->int_scan_req
->n_channels
= n_ch
;
838 if (WARN_ON_ONCE(chan
->flags
& (IEEE80211_CHAN_NO_IBSS
|
839 IEEE80211_CHAN_DISABLED
)))
842 local
->int_scan_req
->channels
[0] = chan
;
843 local
->int_scan_req
->n_channels
= 1;
846 local
->int_scan_req
->ssids
= &local
->scan_ssid
;
847 local
->int_scan_req
->n_ssids
= 1;
848 memcpy(local
->int_scan_req
->ssids
[0].ssid
, ssid
, IEEE80211_MAX_SSID_LEN
);
849 local
->int_scan_req
->ssids
[0].ssid_len
= ssid_len
;
851 ret
= __ieee80211_start_scan(sdata
, sdata
->local
->int_scan_req
);
853 mutex_unlock(&local
->mtx
);
858 * Only call this function when a scan can't be queued -- under RTNL.
860 void ieee80211_scan_cancel(struct ieee80211_local
*local
)
863 * We are canceling software scan, or deferred scan that was not
864 * yet really started (see __ieee80211_start_scan ).
866 * Regarding hardware scan:
867 * - we can not call __ieee80211_scan_completed() as when
868 * SCAN_HW_SCANNING bit is set this function change
869 * local->hw_scan_req to operate on 5G band, what race with
870 * driver which can use local->hw_scan_req
872 * - we can not cancel scan_work since driver can schedule it
873 * by ieee80211_scan_completed(..., true) to finish scan
875 * Hence we only call the cancel_hw_scan() callback, but the low-level
876 * driver is still responsible for calling ieee80211_scan_completed()
877 * after the scan was completed/aborted.
880 mutex_lock(&local
->mtx
);
881 if (!local
->scan_req
)
885 * We have a scan running and the driver already reported completion,
886 * but the worker hasn't run yet or is stuck on the mutex - mark it as
889 if (test_bit(SCAN_HW_SCANNING
, &local
->scanning
) &&
890 test_bit(SCAN_COMPLETED
, &local
->scanning
)) {
891 set_bit(SCAN_HW_CANCELLED
, &local
->scanning
);
895 if (test_bit(SCAN_HW_SCANNING
, &local
->scanning
)) {
897 * Make sure that __ieee80211_scan_completed doesn't trigger a
898 * scan on another band.
900 set_bit(SCAN_HW_CANCELLED
, &local
->scanning
);
901 if (local
->ops
->cancel_hw_scan
)
902 drv_cancel_hw_scan(local
,
903 rcu_dereference_protected(local
->scan_sdata
,
904 lockdep_is_held(&local
->mtx
)));
909 * If the work is currently running, it must be blocked on
910 * the mutex, but we'll set scan_sdata = NULL and it'll
911 * simply exit once it acquires the mutex.
913 cancel_delayed_work(&local
->scan_work
);
915 __ieee80211_scan_completed(&local
->hw
, true, false);
917 mutex_unlock(&local
->mtx
);
920 int ieee80211_request_sched_scan_start(struct ieee80211_sub_if_data
*sdata
,
921 struct cfg80211_sched_scan_request
*req
)
923 struct ieee80211_local
*local
= sdata
->local
;
924 struct ieee80211_sched_scan_ies sched_scan_ies
= {};
927 iebufsz
= 2 + IEEE80211_MAX_SSID_LEN
+
928 local
->scan_ies_len
+ req
->ie_len
;
930 mutex_lock(&local
->mtx
);
932 if (rcu_access_pointer(local
->sched_scan_sdata
)) {
937 if (!local
->ops
->sched_scan_start
) {
942 for (i
= 0; i
< IEEE80211_NUM_BANDS
; i
++) {
943 if (!local
->hw
.wiphy
->bands
[i
])
946 sched_scan_ies
.ie
[i
] = kzalloc(iebufsz
, GFP_KERNEL
);
947 if (!sched_scan_ies
.ie
[i
]) {
952 sched_scan_ies
.len
[i
] =
953 ieee80211_build_preq_ies(local
, sched_scan_ies
.ie
[i
],
954 iebufsz
, req
->ie
, req
->ie_len
,
958 ret
= drv_sched_scan_start(local
, sdata
, req
, &sched_scan_ies
);
960 rcu_assign_pointer(local
->sched_scan_sdata
, sdata
);
964 kfree(sched_scan_ies
.ie
[--i
]);
966 mutex_unlock(&local
->mtx
);
970 int ieee80211_request_sched_scan_stop(struct ieee80211_sub_if_data
*sdata
)
972 struct ieee80211_local
*local
= sdata
->local
;
975 mutex_lock(&local
->mtx
);
977 if (!local
->ops
->sched_scan_stop
) {
982 if (rcu_access_pointer(local
->sched_scan_sdata
))
983 drv_sched_scan_stop(local
, sdata
);
986 mutex_unlock(&local
->mtx
);
991 void ieee80211_sched_scan_results(struct ieee80211_hw
*hw
)
993 struct ieee80211_local
*local
= hw_to_local(hw
);
995 trace_api_sched_scan_results(local
);
997 cfg80211_sched_scan_results(hw
->wiphy
);
999 EXPORT_SYMBOL(ieee80211_sched_scan_results
);
1001 void ieee80211_sched_scan_stopped_work(struct work_struct
*work
)
1003 struct ieee80211_local
*local
=
1004 container_of(work
, struct ieee80211_local
,
1005 sched_scan_stopped_work
);
1007 mutex_lock(&local
->mtx
);
1009 if (!rcu_access_pointer(local
->sched_scan_sdata
)) {
1010 mutex_unlock(&local
->mtx
);
1014 rcu_assign_pointer(local
->sched_scan_sdata
, NULL
);
1016 mutex_unlock(&local
->mtx
);
1018 cfg80211_sched_scan_stopped(local
->hw
.wiphy
);
1021 void ieee80211_sched_scan_stopped(struct ieee80211_hw
*hw
)
1023 struct ieee80211_local
*local
= hw_to_local(hw
);
1025 trace_api_sched_scan_stopped(local
);
1027 ieee80211_queue_work(&local
->hw
, &local
->sched_scan_stopped_work
);
1029 EXPORT_SYMBOL(ieee80211_sched_scan_stopped
);