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
;
83 bss
->device_ts
= rx_status
->device_timestamp
;
85 if (elems
->parse_error
) {
87 bss
->corrupt_data
|= IEEE80211_BSS_CORRUPT_BEACON
;
89 bss
->corrupt_data
|= IEEE80211_BSS_CORRUPT_PROBE_RESP
;
92 bss
->corrupt_data
&= ~IEEE80211_BSS_CORRUPT_BEACON
;
94 bss
->corrupt_data
&= ~IEEE80211_BSS_CORRUPT_PROBE_RESP
;
97 /* save the ERP value so that it is available at association time */
98 if (elems
->erp_info
&& elems
->erp_info_len
>= 1 &&
99 (!elems
->parse_error
||
100 !(bss
->valid_data
& IEEE80211_BSS_VALID_ERP
))) {
101 bss
->erp_value
= elems
->erp_info
[0];
102 bss
->has_erp_value
= true;
103 if (!elems
->parse_error
)
104 bss
->valid_data
|= IEEE80211_BSS_VALID_ERP
;
107 /* replace old supported rates if we get new values */
108 if (!elems
->parse_error
||
109 !(bss
->valid_data
& IEEE80211_BSS_VALID_RATES
)) {
111 if (elems
->supp_rates
) {
112 clen
= IEEE80211_MAX_SUPP_RATES
;
113 if (clen
> elems
->supp_rates_len
)
114 clen
= elems
->supp_rates_len
;
115 memcpy(bss
->supp_rates
, elems
->supp_rates
, clen
);
118 if (elems
->ext_supp_rates
) {
119 clen
= IEEE80211_MAX_SUPP_RATES
- srlen
;
120 if (clen
> elems
->ext_supp_rates_len
)
121 clen
= elems
->ext_supp_rates_len
;
122 memcpy(bss
->supp_rates
+ srlen
, elems
->ext_supp_rates
,
127 bss
->supp_rates_len
= srlen
;
128 if (!elems
->parse_error
)
129 bss
->valid_data
|= IEEE80211_BSS_VALID_RATES
;
133 if (!elems
->parse_error
||
134 !(bss
->valid_data
& IEEE80211_BSS_VALID_WMM
)) {
135 bss
->wmm_used
= elems
->wmm_param
|| elems
->wmm_info
;
136 bss
->uapsd_supported
= is_uapsd_supported(elems
);
137 if (!elems
->parse_error
)
138 bss
->valid_data
|= IEEE80211_BSS_VALID_WMM
;
144 void ieee80211_scan_rx(struct ieee80211_local
*local
, struct sk_buff
*skb
)
146 struct ieee80211_rx_status
*rx_status
= IEEE80211_SKB_RXCB(skb
);
147 struct ieee80211_sub_if_data
*sdata1
, *sdata2
;
148 struct ieee80211_mgmt
*mgmt
= (void *)skb
->data
;
149 struct ieee80211_bss
*bss
;
151 struct ieee80211_channel
*channel
;
154 struct ieee802_11_elems elems
;
157 (!ieee80211_is_probe_resp(mgmt
->frame_control
) &&
158 !ieee80211_is_beacon(mgmt
->frame_control
)))
161 sdata1
= rcu_dereference(local
->scan_sdata
);
162 sdata2
= rcu_dereference(local
->sched_scan_sdata
);
164 if (likely(!sdata1
&& !sdata2
))
167 if (ieee80211_is_probe_resp(mgmt
->frame_control
)) {
168 /* ignore ProbeResp to foreign address */
169 if ((!sdata1
|| !ether_addr_equal(mgmt
->da
, sdata1
->vif
.addr
)) &&
170 (!sdata2
|| !ether_addr_equal(mgmt
->da
, sdata2
->vif
.addr
)))
173 elements
= mgmt
->u
.probe_resp
.variable
;
174 baselen
= offsetof(struct ieee80211_mgmt
, u
.probe_resp
.variable
);
177 baselen
= offsetof(struct ieee80211_mgmt
, u
.beacon
.variable
);
178 elements
= mgmt
->u
.beacon
.variable
;
182 if (baselen
> skb
->len
)
185 ieee802_11_parse_elems(elements
, skb
->len
- baselen
, &elems
);
187 channel
= ieee80211_get_channel(local
->hw
.wiphy
, rx_status
->freq
);
189 if (!channel
|| channel
->flags
& IEEE80211_CHAN_DISABLED
)
192 bss
= ieee80211_bss_info_update(local
, rx_status
,
193 mgmt
, skb
->len
, &elems
,
196 ieee80211_rx_bss_put(local
, bss
);
199 /* return false if no more work */
200 static bool ieee80211_prep_hw_scan(struct ieee80211_local
*local
)
202 struct cfg80211_scan_request
*req
= local
->scan_req
;
203 enum ieee80211_band band
;
204 int i
, ielen
, n_chans
;
207 if (local
->hw_scan_band
== IEEE80211_NUM_BANDS
)
210 band
= local
->hw_scan_band
;
212 for (i
= 0; i
< req
->n_channels
; i
++) {
213 if (req
->channels
[i
]->band
== band
) {
214 local
->hw_scan_req
->channels
[n_chans
] =
220 local
->hw_scan_band
++;
223 local
->hw_scan_req
->n_channels
= n_chans
;
225 ielen
= ieee80211_build_preq_ies(local
, (u8
*)local
->hw_scan_req
->ie
,
226 local
->hw_scan_ies_bufsize
,
227 req
->ie
, req
->ie_len
, band
,
228 req
->rates
[band
], 0);
229 local
->hw_scan_req
->ie_len
= ielen
;
230 local
->hw_scan_req
->no_cck
= req
->no_cck
;
235 static void __ieee80211_scan_completed(struct ieee80211_hw
*hw
, bool aborted
,
238 struct ieee80211_local
*local
= hw_to_local(hw
);
240 lockdep_assert_held(&local
->mtx
);
243 * It's ok to abort a not-yet-running scan (that
244 * we have one at all will be verified by checking
245 * local->scan_req next), but not to complete it
248 if (WARN_ON(!local
->scanning
&& !aborted
))
251 if (WARN_ON(!local
->scan_req
))
254 if (was_hw_scan
&& !aborted
&& ieee80211_prep_hw_scan(local
)) {
257 rc
= drv_hw_scan(local
,
258 rcu_dereference_protected(local
->scan_sdata
,
259 lockdep_is_held(&local
->mtx
)),
266 kfree(local
->hw_scan_req
);
267 local
->hw_scan_req
= NULL
;
269 if (local
->scan_req
!= local
->int_scan_req
)
270 cfg80211_scan_done(local
->scan_req
, aborted
);
271 local
->scan_req
= NULL
;
272 rcu_assign_pointer(local
->scan_sdata
, NULL
);
275 local
->scan_channel
= NULL
;
277 /* Set power back to normal operating levels. */
278 ieee80211_hw_config(local
, 0);
281 ieee80211_configure_filter(local
);
282 drv_sw_scan_complete(local
);
283 ieee80211_offchannel_return(local
);
286 ieee80211_recalc_idle(local
);
288 ieee80211_mlme_notify_scan_completed(local
);
289 ieee80211_ibss_notify_scan_completed(local
);
290 ieee80211_mesh_notify_scan_completed(local
);
291 ieee80211_start_next_roc(local
);
294 void ieee80211_scan_completed(struct ieee80211_hw
*hw
, bool aborted
)
296 struct ieee80211_local
*local
= hw_to_local(hw
);
298 trace_api_scan_completed(local
, aborted
);
300 set_bit(SCAN_COMPLETED
, &local
->scanning
);
302 set_bit(SCAN_ABORTED
, &local
->scanning
);
303 ieee80211_queue_delayed_work(&local
->hw
, &local
->scan_work
, 0);
305 EXPORT_SYMBOL(ieee80211_scan_completed
);
307 static int ieee80211_start_sw_scan(struct ieee80211_local
*local
)
309 /* Software scan is not supported in multi-channel cases */
310 if (local
->use_chanctx
)
314 * Hardware/driver doesn't support hw_scan, so use software
315 * scanning instead. First send a nullfunc frame with power save
316 * bit on so that AP will buffer the frames for us while we are not
317 * listening, then send probe requests to each channel and wait for
318 * the responses. After all channels are scanned, tune back to the
319 * original channel and send a nullfunc frame with power save bit
320 * off to trigger the AP to send us all the buffered frames.
322 * Note that while local->sw_scanning is true everything else but
323 * nullfunc frames and probe requests will be dropped in
324 * ieee80211_tx_h_check_assoc().
326 drv_sw_scan_start(local
);
328 local
->leave_oper_channel_time
= jiffies
;
329 local
->next_scan_state
= SCAN_DECISION
;
330 local
->scan_channel_idx
= 0;
332 ieee80211_offchannel_stop_vifs(local
);
334 ieee80211_configure_filter(local
);
336 /* We need to set power level at maximum rate for scanning. */
337 ieee80211_hw_config(local
, 0);
339 ieee80211_queue_delayed_work(&local
->hw
,
340 &local
->scan_work
, 0);
345 static bool ieee80211_can_scan(struct ieee80211_local
*local
,
346 struct ieee80211_sub_if_data
*sdata
)
348 if (!list_empty(&local
->roc_list
))
351 if (sdata
->vif
.type
== NL80211_IFTYPE_STATION
&&
352 sdata
->u
.mgd
.flags
& (IEEE80211_STA_BEACON_POLL
|
353 IEEE80211_STA_CONNECTION_POLL
))
359 void ieee80211_run_deferred_scan(struct ieee80211_local
*local
)
361 lockdep_assert_held(&local
->mtx
);
363 if (!local
->scan_req
|| local
->scanning
)
366 if (!ieee80211_can_scan(local
,
367 rcu_dereference_protected(
369 lockdep_is_held(&local
->mtx
))))
372 ieee80211_queue_delayed_work(&local
->hw
, &local
->scan_work
,
373 round_jiffies_relative(0));
376 static void ieee80211_scan_state_send_probe(struct ieee80211_local
*local
,
377 unsigned long *next_delay
)
380 struct ieee80211_sub_if_data
*sdata
;
381 enum ieee80211_band band
= local
->hw
.conf
.channel
->band
;
383 sdata
= rcu_dereference_protected(local
->scan_sdata
,
384 lockdep_is_held(&local
->mtx
));
386 for (i
= 0; i
< local
->scan_req
->n_ssids
; i
++)
387 ieee80211_send_probe_req(
389 local
->scan_req
->ssids
[i
].ssid
,
390 local
->scan_req
->ssids
[i
].ssid_len
,
391 local
->scan_req
->ie
, local
->scan_req
->ie_len
,
392 local
->scan_req
->rates
[band
], false,
393 local
->scan_req
->no_cck
?
394 IEEE80211_TX_CTL_NO_CCK_RATE
: 0,
395 local
->hw
.conf
.channel
, true);
398 * After sending probe requests, wait for probe responses
401 *next_delay
= IEEE80211_CHANNEL_TIME
;
402 local
->next_scan_state
= SCAN_DECISION
;
405 static int __ieee80211_start_scan(struct ieee80211_sub_if_data
*sdata
,
406 struct cfg80211_scan_request
*req
)
408 struct ieee80211_local
*local
= sdata
->local
;
411 lockdep_assert_held(&local
->mtx
);
416 if (!ieee80211_can_scan(local
, sdata
)) {
417 /* wait for the work to finish/time out */
418 local
->scan_req
= req
;
419 rcu_assign_pointer(local
->scan_sdata
, sdata
);
423 if (local
->ops
->hw_scan
) {
426 local
->hw_scan_ies_bufsize
= 2 + IEEE80211_MAX_SSID_LEN
+
427 local
->scan_ies_len
+
429 local
->hw_scan_req
= kmalloc(
430 sizeof(*local
->hw_scan_req
) +
431 req
->n_channels
* sizeof(req
->channels
[0]) +
432 local
->hw_scan_ies_bufsize
, GFP_KERNEL
);
433 if (!local
->hw_scan_req
)
436 local
->hw_scan_req
->ssids
= req
->ssids
;
437 local
->hw_scan_req
->n_ssids
= req
->n_ssids
;
438 ies
= (u8
*)local
->hw_scan_req
+
439 sizeof(*local
->hw_scan_req
) +
440 req
->n_channels
* sizeof(req
->channels
[0]);
441 local
->hw_scan_req
->ie
= ies
;
442 local
->hw_scan_req
->flags
= req
->flags
;
444 local
->hw_scan_band
= 0;
447 * After allocating local->hw_scan_req, we must
448 * go through until ieee80211_prep_hw_scan(), so
449 * anything that might be changed here and leave
450 * this function early must not go after this
455 local
->scan_req
= req
;
456 rcu_assign_pointer(local
->scan_sdata
, sdata
);
458 if (local
->ops
->hw_scan
) {
459 __set_bit(SCAN_HW_SCANNING
, &local
->scanning
);
460 } else if ((req
->n_channels
== 1) &&
461 (req
->channels
[0] == local
->_oper_channel
)) {
463 * If we are scanning only on the operating channel
464 * then we do not need to stop normal activities
466 unsigned long next_delay
;
468 __set_bit(SCAN_ONCHANNEL_SCANNING
, &local
->scanning
);
470 ieee80211_recalc_idle(local
);
472 /* Notify driver scan is starting, keep order of operations
473 * same as normal software scan, in case that matters. */
474 drv_sw_scan_start(local
);
476 ieee80211_configure_filter(local
); /* accept probe-responses */
478 /* We need to ensure power level is at max for scanning. */
479 ieee80211_hw_config(local
, 0);
481 if ((req
->channels
[0]->flags
&
482 IEEE80211_CHAN_PASSIVE_SCAN
) ||
483 !local
->scan_req
->n_ssids
) {
484 next_delay
= IEEE80211_PASSIVE_CHANNEL_TIME
;
486 ieee80211_scan_state_send_probe(local
, &next_delay
);
487 next_delay
= IEEE80211_CHANNEL_TIME
;
490 /* Now, just wait a bit and we are all done! */
491 ieee80211_queue_delayed_work(&local
->hw
, &local
->scan_work
,
495 /* Do normal software scan */
496 __set_bit(SCAN_SW_SCANNING
, &local
->scanning
);
499 ieee80211_recalc_idle(local
);
501 if (local
->ops
->hw_scan
) {
502 WARN_ON(!ieee80211_prep_hw_scan(local
));
503 rc
= drv_hw_scan(local
, sdata
, local
->hw_scan_req
);
505 rc
= ieee80211_start_sw_scan(local
);
508 kfree(local
->hw_scan_req
);
509 local
->hw_scan_req
= NULL
;
512 ieee80211_recalc_idle(local
);
514 local
->scan_req
= NULL
;
515 rcu_assign_pointer(local
->scan_sdata
, NULL
);
522 ieee80211_scan_get_channel_time(struct ieee80211_channel
*chan
)
525 * TODO: channel switching also consumes quite some time,
526 * add that delay as well to get a better estimation
528 if (chan
->flags
& IEEE80211_CHAN_PASSIVE_SCAN
)
529 return IEEE80211_PASSIVE_CHANNEL_TIME
;
530 return IEEE80211_PROBE_DELAY
+ IEEE80211_CHANNEL_TIME
;
533 static void ieee80211_scan_state_decision(struct ieee80211_local
*local
,
534 unsigned long *next_delay
)
536 bool associated
= false;
537 bool tx_empty
= true;
539 struct ieee80211_sub_if_data
*sdata
;
540 struct ieee80211_channel
*next_chan
;
541 enum mac80211_scan_state next_scan_state
;
544 * check if at least one STA interface is associated,
545 * check if at least one STA interface has pending tx frames
546 * and grab the lowest used beacon interval
548 mutex_lock(&local
->iflist_mtx
);
549 list_for_each_entry(sdata
, &local
->interfaces
, list
) {
550 if (!ieee80211_sdata_running(sdata
))
553 if (sdata
->vif
.type
== NL80211_IFTYPE_STATION
) {
554 if (sdata
->u
.mgd
.associated
) {
557 if (!qdisc_all_tx_empty(sdata
->dev
)) {
564 mutex_unlock(&local
->iflist_mtx
);
566 next_chan
= local
->scan_req
->channels
[local
->scan_channel_idx
];
569 * we're currently scanning a different channel, let's
570 * see if we can scan another channel without interfering
571 * with the current traffic situation.
573 * Keep good latency, do not stay off-channel more than 125 ms.
576 bad_latency
= time_after(jiffies
+
577 ieee80211_scan_get_channel_time(next_chan
),
578 local
->leave_oper_channel_time
+ HZ
/ 8);
580 if (associated
&& !tx_empty
) {
581 if (local
->scan_req
->flags
& NL80211_SCAN_FLAG_LOW_PRIORITY
)
582 next_scan_state
= SCAN_ABORT
;
584 next_scan_state
= SCAN_SUSPEND
;
585 } else if (associated
&& bad_latency
) {
586 next_scan_state
= SCAN_SUSPEND
;
588 next_scan_state
= SCAN_SET_CHANNEL
;
591 local
->next_scan_state
= next_scan_state
;
596 static void ieee80211_scan_state_set_channel(struct ieee80211_local
*local
,
597 unsigned long *next_delay
)
600 struct ieee80211_channel
*chan
;
603 chan
= local
->scan_req
->channels
[local
->scan_channel_idx
];
605 local
->scan_channel
= chan
;
607 if (ieee80211_hw_config(local
, IEEE80211_CONF_CHANGE_CHANNEL
))
610 /* advance state machine to next channel/band */
611 local
->scan_channel_idx
++;
614 /* if we skip this channel return to the decision state */
615 local
->next_scan_state
= SCAN_DECISION
;
620 * Probe delay is used to update the NAV, cf. 11.1.3.2.2
621 * (which unfortunately doesn't say _why_ step a) is done,
622 * but it waits for the probe delay or until a frame is
623 * received - and the received frame would update the NAV).
624 * For now, we do not support waiting until a frame is
627 * In any case, it is not necessary for a passive scan.
629 if (chan
->flags
& IEEE80211_CHAN_PASSIVE_SCAN
||
630 !local
->scan_req
->n_ssids
) {
631 *next_delay
= IEEE80211_PASSIVE_CHANNEL_TIME
;
632 local
->next_scan_state
= SCAN_DECISION
;
636 /* active scan, send probes */
637 *next_delay
= IEEE80211_PROBE_DELAY
;
638 local
->next_scan_state
= SCAN_SEND_PROBE
;
641 static void ieee80211_scan_state_suspend(struct ieee80211_local
*local
,
642 unsigned long *next_delay
)
644 /* switch back to the operating channel */
645 local
->scan_channel
= NULL
;
646 ieee80211_hw_config(local
, IEEE80211_CONF_CHANGE_CHANNEL
);
649 ieee80211_offchannel_return(local
);
651 *next_delay
= HZ
/ 5;
652 /* afterwards, resume scan & go to next channel */
653 local
->next_scan_state
= SCAN_RESUME
;
656 static void ieee80211_scan_state_resume(struct ieee80211_local
*local
,
657 unsigned long *next_delay
)
659 ieee80211_offchannel_stop_vifs(local
);
661 if (local
->ops
->flush
) {
662 drv_flush(local
, false);
665 *next_delay
= HZ
/ 10;
667 /* remember when we left the operating channel */
668 local
->leave_oper_channel_time
= jiffies
;
670 /* advance to the next channel to be scanned */
671 local
->next_scan_state
= SCAN_SET_CHANNEL
;
674 void ieee80211_scan_work(struct work_struct
*work
)
676 struct ieee80211_local
*local
=
677 container_of(work
, struct ieee80211_local
, scan_work
.work
);
678 struct ieee80211_sub_if_data
*sdata
;
679 unsigned long next_delay
= 0;
680 bool aborted
, hw_scan
;
682 mutex_lock(&local
->mtx
);
684 sdata
= rcu_dereference_protected(local
->scan_sdata
,
685 lockdep_is_held(&local
->mtx
));
687 /* When scanning on-channel, the first-callback means completed. */
688 if (test_bit(SCAN_ONCHANNEL_SCANNING
, &local
->scanning
)) {
689 aborted
= test_and_clear_bit(SCAN_ABORTED
, &local
->scanning
);
693 if (test_and_clear_bit(SCAN_COMPLETED
, &local
->scanning
)) {
694 aborted
= test_and_clear_bit(SCAN_ABORTED
, &local
->scanning
);
698 if (!sdata
|| !local
->scan_req
)
701 if (local
->scan_req
&& !local
->scanning
) {
702 struct cfg80211_scan_request
*req
= local
->scan_req
;
705 local
->scan_req
= NULL
;
706 rcu_assign_pointer(local
->scan_sdata
, NULL
);
708 rc
= __ieee80211_start_scan(sdata
, req
);
710 /* need to complete scan in cfg80211 */
711 local
->scan_req
= req
;
719 * Avoid re-scheduling when the sdata is going away.
721 if (!ieee80211_sdata_running(sdata
)) {
727 * as long as no delay is required advance immediately
728 * without scheduling a new work
731 if (!ieee80211_sdata_running(sdata
)) {
736 switch (local
->next_scan_state
) {
738 /* if no more bands/channels left, complete scan */
739 if (local
->scan_channel_idx
>= local
->scan_req
->n_channels
) {
743 ieee80211_scan_state_decision(local
, &next_delay
);
745 case SCAN_SET_CHANNEL
:
746 ieee80211_scan_state_set_channel(local
, &next_delay
);
748 case SCAN_SEND_PROBE
:
749 ieee80211_scan_state_send_probe(local
, &next_delay
);
752 ieee80211_scan_state_suspend(local
, &next_delay
);
755 ieee80211_scan_state_resume(local
, &next_delay
);
761 } while (next_delay
== 0);
763 ieee80211_queue_delayed_work(&local
->hw
, &local
->scan_work
, next_delay
);
767 hw_scan
= test_bit(SCAN_HW_SCANNING
, &local
->scanning
);
768 __ieee80211_scan_completed(&local
->hw
, aborted
, 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_ibss_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 */
804 for (band
= 0; band
< IEEE80211_NUM_BANDS
; band
++) {
805 if (!local
->hw
.wiphy
->bands
[band
])
808 max_n
= local
->hw
.wiphy
->bands
[band
]->n_channels
;
809 for (i
= 0; i
< max_n
; i
++) {
810 struct ieee80211_channel
*tmp_ch
=
811 &local
->hw
.wiphy
->bands
[band
]->channels
[i
];
813 if (tmp_ch
->flags
& (IEEE80211_CHAN_NO_IBSS
|
814 IEEE80211_CHAN_DISABLED
))
817 local
->int_scan_req
->channels
[n_ch
] = tmp_ch
;
822 if (WARN_ON_ONCE(n_ch
== 0))
825 local
->int_scan_req
->n_channels
= n_ch
;
827 if (WARN_ON_ONCE(chan
->flags
& (IEEE80211_CHAN_NO_IBSS
|
828 IEEE80211_CHAN_DISABLED
)))
831 local
->int_scan_req
->channels
[0] = chan
;
832 local
->int_scan_req
->n_channels
= 1;
835 local
->int_scan_req
->ssids
= &local
->scan_ssid
;
836 local
->int_scan_req
->n_ssids
= 1;
837 memcpy(local
->int_scan_req
->ssids
[0].ssid
, ssid
, IEEE80211_MAX_SSID_LEN
);
838 local
->int_scan_req
->ssids
[0].ssid_len
= ssid_len
;
840 ret
= __ieee80211_start_scan(sdata
, sdata
->local
->int_scan_req
);
842 mutex_unlock(&local
->mtx
);
847 * Only call this function when a scan can't be queued -- under RTNL.
849 void ieee80211_scan_cancel(struct ieee80211_local
*local
)
852 * We are canceling software scan, or deferred scan that was not
853 * yet really started (see __ieee80211_start_scan ).
855 * Regarding hardware scan:
856 * - we can not call __ieee80211_scan_completed() as when
857 * SCAN_HW_SCANNING bit is set this function change
858 * local->hw_scan_req to operate on 5G band, what race with
859 * driver which can use local->hw_scan_req
861 * - we can not cancel scan_work since driver can schedule it
862 * by ieee80211_scan_completed(..., true) to finish scan
864 * Hence we only call the cancel_hw_scan() callback, but the low-level
865 * driver is still responsible for calling ieee80211_scan_completed()
866 * after the scan was completed/aborted.
869 mutex_lock(&local
->mtx
);
870 if (!local
->scan_req
)
873 if (test_bit(SCAN_HW_SCANNING
, &local
->scanning
)) {
874 if (local
->ops
->cancel_hw_scan
)
875 drv_cancel_hw_scan(local
,
876 rcu_dereference_protected(local
->scan_sdata
,
877 lockdep_is_held(&local
->mtx
)));
882 * If the work is currently running, it must be blocked on
883 * the mutex, but we'll set scan_sdata = NULL and it'll
884 * simply exit once it acquires the mutex.
886 cancel_delayed_work(&local
->scan_work
);
888 __ieee80211_scan_completed(&local
->hw
, true, false);
890 mutex_unlock(&local
->mtx
);
893 int ieee80211_request_sched_scan_start(struct ieee80211_sub_if_data
*sdata
,
894 struct cfg80211_sched_scan_request
*req
)
896 struct ieee80211_local
*local
= sdata
->local
;
897 struct ieee80211_sched_scan_ies sched_scan_ies
= {};
900 iebufsz
= 2 + IEEE80211_MAX_SSID_LEN
+
901 local
->scan_ies_len
+ req
->ie_len
;
903 mutex_lock(&local
->mtx
);
905 if (rcu_access_pointer(local
->sched_scan_sdata
)) {
910 if (!local
->ops
->sched_scan_start
) {
915 for (i
= 0; i
< IEEE80211_NUM_BANDS
; i
++) {
916 if (!local
->hw
.wiphy
->bands
[i
])
919 sched_scan_ies
.ie
[i
] = kzalloc(iebufsz
, GFP_KERNEL
);
920 if (!sched_scan_ies
.ie
[i
]) {
925 sched_scan_ies
.len
[i
] =
926 ieee80211_build_preq_ies(local
, sched_scan_ies
.ie
[i
],
927 iebufsz
, req
->ie
, req
->ie_len
,
931 ret
= drv_sched_scan_start(local
, sdata
, req
, &sched_scan_ies
);
933 rcu_assign_pointer(local
->sched_scan_sdata
, sdata
);
937 kfree(sched_scan_ies
.ie
[--i
]);
939 mutex_unlock(&local
->mtx
);
943 int ieee80211_request_sched_scan_stop(struct ieee80211_sub_if_data
*sdata
)
945 struct ieee80211_local
*local
= sdata
->local
;
948 mutex_lock(&local
->mtx
);
950 if (!local
->ops
->sched_scan_stop
) {
955 if (rcu_access_pointer(local
->sched_scan_sdata
))
956 drv_sched_scan_stop(local
, sdata
);
959 mutex_unlock(&local
->mtx
);
964 void ieee80211_sched_scan_results(struct ieee80211_hw
*hw
)
966 struct ieee80211_local
*local
= hw_to_local(hw
);
968 trace_api_sched_scan_results(local
);
970 cfg80211_sched_scan_results(hw
->wiphy
);
972 EXPORT_SYMBOL(ieee80211_sched_scan_results
);
974 void ieee80211_sched_scan_stopped_work(struct work_struct
*work
)
976 struct ieee80211_local
*local
=
977 container_of(work
, struct ieee80211_local
,
978 sched_scan_stopped_work
);
980 mutex_lock(&local
->mtx
);
982 if (!rcu_access_pointer(local
->sched_scan_sdata
)) {
983 mutex_unlock(&local
->mtx
);
987 rcu_assign_pointer(local
->sched_scan_sdata
, NULL
);
989 mutex_unlock(&local
->mtx
);
991 cfg80211_sched_scan_stopped(local
->hw
.wiphy
);
994 void ieee80211_sched_scan_stopped(struct ieee80211_hw
*hw
)
996 struct ieee80211_local
*local
= hw_to_local(hw
);
998 trace_api_sched_scan_stopped(local
);
1000 ieee80211_queue_work(&local
->hw
, &local
->sched_scan_stopped_work
);
1002 EXPORT_SYMBOL(ieee80211_sched_scan_stopped
);