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
->erp_info_len
>= 1 &&
102 (!elems
->parse_error
||
103 !(bss
->valid_data
& IEEE80211_BSS_VALID_ERP
))) {
104 bss
->erp_value
= elems
->erp_info
[0];
105 bss
->has_erp_value
= true;
106 if (!elems
->parse_error
)
107 bss
->valid_data
|= IEEE80211_BSS_VALID_ERP
;
110 /* replace old supported rates if we get new values */
111 if (!elems
->parse_error
||
112 !(bss
->valid_data
& IEEE80211_BSS_VALID_RATES
)) {
114 if (elems
->supp_rates
) {
115 clen
= IEEE80211_MAX_SUPP_RATES
;
116 if (clen
> elems
->supp_rates_len
)
117 clen
= elems
->supp_rates_len
;
118 memcpy(bss
->supp_rates
, elems
->supp_rates
, clen
);
121 if (elems
->ext_supp_rates
) {
122 clen
= IEEE80211_MAX_SUPP_RATES
- srlen
;
123 if (clen
> elems
->ext_supp_rates_len
)
124 clen
= elems
->ext_supp_rates_len
;
125 memcpy(bss
->supp_rates
+ srlen
, elems
->ext_supp_rates
,
130 bss
->supp_rates_len
= srlen
;
131 if (!elems
->parse_error
)
132 bss
->valid_data
|= IEEE80211_BSS_VALID_RATES
;
136 if (!elems
->parse_error
||
137 !(bss
->valid_data
& IEEE80211_BSS_VALID_WMM
)) {
138 bss
->wmm_used
= elems
->wmm_param
|| elems
->wmm_info
;
139 bss
->uapsd_supported
= is_uapsd_supported(elems
);
140 if (!elems
->parse_error
)
141 bss
->valid_data
|= IEEE80211_BSS_VALID_WMM
;
147 void ieee80211_scan_rx(struct ieee80211_local
*local
, struct sk_buff
*skb
)
149 struct ieee80211_rx_status
*rx_status
= IEEE80211_SKB_RXCB(skb
);
150 struct ieee80211_sub_if_data
*sdata1
, *sdata2
;
151 struct ieee80211_mgmt
*mgmt
= (void *)skb
->data
;
152 struct ieee80211_bss
*bss
;
154 struct ieee80211_channel
*channel
;
157 struct ieee802_11_elems elems
;
160 (!ieee80211_is_probe_resp(mgmt
->frame_control
) &&
161 !ieee80211_is_beacon(mgmt
->frame_control
)))
164 sdata1
= rcu_dereference(local
->scan_sdata
);
165 sdata2
= rcu_dereference(local
->sched_scan_sdata
);
167 if (likely(!sdata1
&& !sdata2
))
170 if (ieee80211_is_probe_resp(mgmt
->frame_control
)) {
171 /* ignore ProbeResp to foreign address */
172 if ((!sdata1
|| !ether_addr_equal(mgmt
->da
, sdata1
->vif
.addr
)) &&
173 (!sdata2
|| !ether_addr_equal(mgmt
->da
, sdata2
->vif
.addr
)))
176 elements
= mgmt
->u
.probe_resp
.variable
;
177 baselen
= offsetof(struct ieee80211_mgmt
, u
.probe_resp
.variable
);
180 baselen
= offsetof(struct ieee80211_mgmt
, u
.beacon
.variable
);
181 elements
= mgmt
->u
.beacon
.variable
;
185 if (baselen
> skb
->len
)
188 ieee802_11_parse_elems(elements
, skb
->len
- baselen
, &elems
);
190 channel
= ieee80211_get_channel(local
->hw
.wiphy
, rx_status
->freq
);
192 if (!channel
|| channel
->flags
& IEEE80211_CHAN_DISABLED
)
195 bss
= ieee80211_bss_info_update(local
, rx_status
,
196 mgmt
, skb
->len
, &elems
,
199 ieee80211_rx_bss_put(local
, bss
);
202 /* return false if no more work */
203 static bool ieee80211_prep_hw_scan(struct ieee80211_local
*local
)
205 struct cfg80211_scan_request
*req
= local
->scan_req
;
206 enum ieee80211_band band
;
207 int i
, ielen
, n_chans
;
210 if (local
->hw_scan_band
== IEEE80211_NUM_BANDS
)
213 band
= local
->hw_scan_band
;
215 for (i
= 0; i
< req
->n_channels
; i
++) {
216 if (req
->channels
[i
]->band
== band
) {
217 local
->hw_scan_req
->channels
[n_chans
] =
223 local
->hw_scan_band
++;
226 local
->hw_scan_req
->n_channels
= n_chans
;
228 ielen
= ieee80211_build_preq_ies(local
, (u8
*)local
->hw_scan_req
->ie
,
229 local
->hw_scan_ies_bufsize
,
230 req
->ie
, req
->ie_len
, band
,
231 req
->rates
[band
], 0);
232 local
->hw_scan_req
->ie_len
= ielen
;
233 local
->hw_scan_req
->no_cck
= req
->no_cck
;
238 static void __ieee80211_scan_completed(struct ieee80211_hw
*hw
, bool aborted
,
241 struct ieee80211_local
*local
= hw_to_local(hw
);
243 lockdep_assert_held(&local
->mtx
);
246 * It's ok to abort a not-yet-running scan (that
247 * we have one at all will be verified by checking
248 * local->scan_req next), but not to complete it
251 if (WARN_ON(!local
->scanning
&& !aborted
))
254 if (WARN_ON(!local
->scan_req
))
257 if (was_hw_scan
&& !aborted
&& ieee80211_prep_hw_scan(local
)) {
260 rc
= drv_hw_scan(local
,
261 rcu_dereference_protected(local
->scan_sdata
,
262 lockdep_is_held(&local
->mtx
)),
269 kfree(local
->hw_scan_req
);
270 local
->hw_scan_req
= NULL
;
272 if (local
->scan_req
!= local
->int_scan_req
)
273 cfg80211_scan_done(local
->scan_req
, aborted
);
274 local
->scan_req
= NULL
;
275 rcu_assign_pointer(local
->scan_sdata
, NULL
);
278 local
->scan_channel
= NULL
;
280 /* Set power back to normal operating levels. */
281 ieee80211_hw_config(local
, 0);
284 ieee80211_configure_filter(local
);
285 drv_sw_scan_complete(local
);
286 ieee80211_offchannel_return(local
);
289 ieee80211_recalc_idle(local
);
291 ieee80211_mlme_notify_scan_completed(local
);
292 ieee80211_ibss_notify_scan_completed(local
);
293 ieee80211_mesh_notify_scan_completed(local
);
294 ieee80211_start_next_roc(local
);
297 void ieee80211_scan_completed(struct ieee80211_hw
*hw
, bool aborted
)
299 struct ieee80211_local
*local
= hw_to_local(hw
);
301 trace_api_scan_completed(local
, aborted
);
303 set_bit(SCAN_COMPLETED
, &local
->scanning
);
305 set_bit(SCAN_ABORTED
, &local
->scanning
);
306 ieee80211_queue_delayed_work(&local
->hw
, &local
->scan_work
, 0);
308 EXPORT_SYMBOL(ieee80211_scan_completed
);
310 static int ieee80211_start_sw_scan(struct ieee80211_local
*local
)
312 /* Software scan is not supported in multi-channel cases */
313 if (local
->use_chanctx
)
317 * Hardware/driver doesn't support hw_scan, so use software
318 * scanning instead. First send a nullfunc frame with power save
319 * bit on so that AP will buffer the frames for us while we are not
320 * listening, then send probe requests to each channel and wait for
321 * the responses. After all channels are scanned, tune back to the
322 * original channel and send a nullfunc frame with power save bit
323 * off to trigger the AP to send us all the buffered frames.
325 * Note that while local->sw_scanning is true everything else but
326 * nullfunc frames and probe requests will be dropped in
327 * ieee80211_tx_h_check_assoc().
329 drv_sw_scan_start(local
);
331 local
->leave_oper_channel_time
= jiffies
;
332 local
->next_scan_state
= SCAN_DECISION
;
333 local
->scan_channel_idx
= 0;
335 ieee80211_offchannel_stop_vifs(local
);
337 /* ensure nullfunc is transmitted before leaving operating channel */
338 drv_flush(local
, false);
340 ieee80211_configure_filter(local
);
342 /* We need to set power level at maximum rate for scanning. */
343 ieee80211_hw_config(local
, 0);
345 ieee80211_queue_delayed_work(&local
->hw
,
346 &local
->scan_work
, 0);
351 static bool ieee80211_can_scan(struct ieee80211_local
*local
,
352 struct ieee80211_sub_if_data
*sdata
)
354 if (!list_empty(&local
->roc_list
))
357 if (sdata
->vif
.type
== NL80211_IFTYPE_STATION
&&
358 sdata
->u
.mgd
.flags
& (IEEE80211_STA_BEACON_POLL
|
359 IEEE80211_STA_CONNECTION_POLL
))
365 void ieee80211_run_deferred_scan(struct ieee80211_local
*local
)
367 lockdep_assert_held(&local
->mtx
);
369 if (!local
->scan_req
|| local
->scanning
)
372 if (!ieee80211_can_scan(local
,
373 rcu_dereference_protected(
375 lockdep_is_held(&local
->mtx
))))
378 ieee80211_queue_delayed_work(&local
->hw
, &local
->scan_work
,
379 round_jiffies_relative(0));
382 static void ieee80211_scan_state_send_probe(struct ieee80211_local
*local
,
383 unsigned long *next_delay
)
386 struct ieee80211_sub_if_data
*sdata
;
387 enum ieee80211_band band
= local
->hw
.conf
.channel
->band
;
390 tx_flags
= IEEE80211_TX_INTFL_OFFCHAN_TX_OK
;
391 if (local
->scan_req
->no_cck
)
392 tx_flags
|= IEEE80211_TX_CTL_NO_CCK_RATE
;
394 sdata
= rcu_dereference_protected(local
->scan_sdata
,
395 lockdep_is_held(&local
->mtx
));
397 for (i
= 0; i
< local
->scan_req
->n_ssids
; i
++)
398 ieee80211_send_probe_req(
400 local
->scan_req
->ssids
[i
].ssid
,
401 local
->scan_req
->ssids
[i
].ssid_len
,
402 local
->scan_req
->ie
, local
->scan_req
->ie_len
,
403 local
->scan_req
->rates
[band
], false,
404 tx_flags
, local
->hw
.conf
.channel
, true);
407 * After sending probe requests, wait for probe responses
410 *next_delay
= IEEE80211_CHANNEL_TIME
;
411 local
->next_scan_state
= SCAN_DECISION
;
414 static int __ieee80211_start_scan(struct ieee80211_sub_if_data
*sdata
,
415 struct cfg80211_scan_request
*req
)
417 struct ieee80211_local
*local
= sdata
->local
;
420 lockdep_assert_held(&local
->mtx
);
425 if (!ieee80211_can_scan(local
, sdata
)) {
426 /* wait for the work to finish/time out */
427 local
->scan_req
= req
;
428 rcu_assign_pointer(local
->scan_sdata
, sdata
);
432 if (local
->ops
->hw_scan
) {
435 local
->hw_scan_ies_bufsize
= 2 + IEEE80211_MAX_SSID_LEN
+
436 local
->scan_ies_len
+
438 local
->hw_scan_req
= kmalloc(
439 sizeof(*local
->hw_scan_req
) +
440 req
->n_channels
* sizeof(req
->channels
[0]) +
441 local
->hw_scan_ies_bufsize
, GFP_KERNEL
);
442 if (!local
->hw_scan_req
)
445 local
->hw_scan_req
->ssids
= req
->ssids
;
446 local
->hw_scan_req
->n_ssids
= req
->n_ssids
;
447 ies
= (u8
*)local
->hw_scan_req
+
448 sizeof(*local
->hw_scan_req
) +
449 req
->n_channels
* sizeof(req
->channels
[0]);
450 local
->hw_scan_req
->ie
= ies
;
451 local
->hw_scan_req
->flags
= req
->flags
;
453 local
->hw_scan_band
= 0;
456 * After allocating local->hw_scan_req, we must
457 * go through until ieee80211_prep_hw_scan(), so
458 * anything that might be changed here and leave
459 * this function early must not go after this
464 local
->scan_req
= req
;
465 rcu_assign_pointer(local
->scan_sdata
, sdata
);
467 if (local
->ops
->hw_scan
) {
468 __set_bit(SCAN_HW_SCANNING
, &local
->scanning
);
469 } else if ((req
->n_channels
== 1) &&
470 (req
->channels
[0] == local
->_oper_channel
)) {
472 * If we are scanning only on the operating channel
473 * then we do not need to stop normal activities
475 unsigned long next_delay
;
477 __set_bit(SCAN_ONCHANNEL_SCANNING
, &local
->scanning
);
479 ieee80211_recalc_idle(local
);
481 /* Notify driver scan is starting, keep order of operations
482 * same as normal software scan, in case that matters. */
483 drv_sw_scan_start(local
);
485 ieee80211_configure_filter(local
); /* accept probe-responses */
487 /* We need to ensure power level is at max for scanning. */
488 ieee80211_hw_config(local
, 0);
490 if ((req
->channels
[0]->flags
&
491 IEEE80211_CHAN_PASSIVE_SCAN
) ||
492 !local
->scan_req
->n_ssids
) {
493 next_delay
= IEEE80211_PASSIVE_CHANNEL_TIME
;
495 ieee80211_scan_state_send_probe(local
, &next_delay
);
496 next_delay
= IEEE80211_CHANNEL_TIME
;
499 /* Now, just wait a bit and we are all done! */
500 ieee80211_queue_delayed_work(&local
->hw
, &local
->scan_work
,
504 /* Do normal software scan */
505 __set_bit(SCAN_SW_SCANNING
, &local
->scanning
);
508 ieee80211_recalc_idle(local
);
510 if (local
->ops
->hw_scan
) {
511 WARN_ON(!ieee80211_prep_hw_scan(local
));
512 rc
= drv_hw_scan(local
, sdata
, local
->hw_scan_req
);
514 rc
= ieee80211_start_sw_scan(local
);
517 kfree(local
->hw_scan_req
);
518 local
->hw_scan_req
= NULL
;
521 ieee80211_recalc_idle(local
);
523 local
->scan_req
= NULL
;
524 rcu_assign_pointer(local
->scan_sdata
, NULL
);
531 ieee80211_scan_get_channel_time(struct ieee80211_channel
*chan
)
534 * TODO: channel switching also consumes quite some time,
535 * add that delay as well to get a better estimation
537 if (chan
->flags
& IEEE80211_CHAN_PASSIVE_SCAN
)
538 return IEEE80211_PASSIVE_CHANNEL_TIME
;
539 return IEEE80211_PROBE_DELAY
+ IEEE80211_CHANNEL_TIME
;
542 static void ieee80211_scan_state_decision(struct ieee80211_local
*local
,
543 unsigned long *next_delay
)
545 bool associated
= false;
546 bool tx_empty
= true;
548 struct ieee80211_sub_if_data
*sdata
;
549 struct ieee80211_channel
*next_chan
;
550 enum mac80211_scan_state next_scan_state
;
553 * check if at least one STA interface is associated,
554 * check if at least one STA interface has pending tx frames
555 * and grab the lowest used beacon interval
557 mutex_lock(&local
->iflist_mtx
);
558 list_for_each_entry(sdata
, &local
->interfaces
, list
) {
559 if (!ieee80211_sdata_running(sdata
))
562 if (sdata
->vif
.type
== NL80211_IFTYPE_STATION
) {
563 if (sdata
->u
.mgd
.associated
) {
566 if (!qdisc_all_tx_empty(sdata
->dev
)) {
573 mutex_unlock(&local
->iflist_mtx
);
575 next_chan
= local
->scan_req
->channels
[local
->scan_channel_idx
];
578 * we're currently scanning a different channel, let's
579 * see if we can scan another channel without interfering
580 * with the current traffic situation.
582 * Keep good latency, do not stay off-channel more than 125 ms.
585 bad_latency
= time_after(jiffies
+
586 ieee80211_scan_get_channel_time(next_chan
),
587 local
->leave_oper_channel_time
+ HZ
/ 8);
589 if (associated
&& !tx_empty
) {
590 if (local
->scan_req
->flags
& NL80211_SCAN_FLAG_LOW_PRIORITY
)
591 next_scan_state
= SCAN_ABORT
;
593 next_scan_state
= SCAN_SUSPEND
;
594 } else if (associated
&& bad_latency
) {
595 next_scan_state
= SCAN_SUSPEND
;
597 next_scan_state
= SCAN_SET_CHANNEL
;
600 local
->next_scan_state
= next_scan_state
;
605 static void ieee80211_scan_state_set_channel(struct ieee80211_local
*local
,
606 unsigned long *next_delay
)
609 struct ieee80211_channel
*chan
;
612 chan
= local
->scan_req
->channels
[local
->scan_channel_idx
];
614 local
->scan_channel
= chan
;
616 if (ieee80211_hw_config(local
, IEEE80211_CONF_CHANGE_CHANNEL
))
619 /* advance state machine to next channel/band */
620 local
->scan_channel_idx
++;
623 /* if we skip this channel return to the decision state */
624 local
->next_scan_state
= SCAN_DECISION
;
629 * Probe delay is used to update the NAV, cf. 11.1.3.2.2
630 * (which unfortunately doesn't say _why_ step a) is done,
631 * but it waits for the probe delay or until a frame is
632 * received - and the received frame would update the NAV).
633 * For now, we do not support waiting until a frame is
636 * In any case, it is not necessary for a passive scan.
638 if (chan
->flags
& IEEE80211_CHAN_PASSIVE_SCAN
||
639 !local
->scan_req
->n_ssids
) {
640 *next_delay
= IEEE80211_PASSIVE_CHANNEL_TIME
;
641 local
->next_scan_state
= SCAN_DECISION
;
645 /* active scan, send probes */
646 *next_delay
= IEEE80211_PROBE_DELAY
;
647 local
->next_scan_state
= SCAN_SEND_PROBE
;
650 static void ieee80211_scan_state_suspend(struct ieee80211_local
*local
,
651 unsigned long *next_delay
)
653 /* switch back to the operating channel */
654 local
->scan_channel
= NULL
;
655 ieee80211_hw_config(local
, IEEE80211_CONF_CHANGE_CHANNEL
);
658 ieee80211_offchannel_return(local
);
660 *next_delay
= HZ
/ 5;
661 /* afterwards, resume scan & go to next channel */
662 local
->next_scan_state
= SCAN_RESUME
;
665 static void ieee80211_scan_state_resume(struct ieee80211_local
*local
,
666 unsigned long *next_delay
)
668 ieee80211_offchannel_stop_vifs(local
);
670 if (local
->ops
->flush
) {
671 drv_flush(local
, false);
674 *next_delay
= HZ
/ 10;
676 /* remember when we left the operating channel */
677 local
->leave_oper_channel_time
= jiffies
;
679 /* advance to the next channel to be scanned */
680 local
->next_scan_state
= SCAN_SET_CHANNEL
;
683 void ieee80211_scan_work(struct work_struct
*work
)
685 struct ieee80211_local
*local
=
686 container_of(work
, struct ieee80211_local
, scan_work
.work
);
687 struct ieee80211_sub_if_data
*sdata
;
688 unsigned long next_delay
= 0;
689 bool aborted
, hw_scan
;
691 mutex_lock(&local
->mtx
);
693 sdata
= rcu_dereference_protected(local
->scan_sdata
,
694 lockdep_is_held(&local
->mtx
));
696 /* When scanning on-channel, the first-callback means completed. */
697 if (test_bit(SCAN_ONCHANNEL_SCANNING
, &local
->scanning
)) {
698 aborted
= test_and_clear_bit(SCAN_ABORTED
, &local
->scanning
);
702 if (test_and_clear_bit(SCAN_COMPLETED
, &local
->scanning
)) {
703 aborted
= test_and_clear_bit(SCAN_ABORTED
, &local
->scanning
);
707 if (!sdata
|| !local
->scan_req
)
710 if (local
->scan_req
&& !local
->scanning
) {
711 struct cfg80211_scan_request
*req
= local
->scan_req
;
714 local
->scan_req
= NULL
;
715 rcu_assign_pointer(local
->scan_sdata
, NULL
);
717 rc
= __ieee80211_start_scan(sdata
, req
);
719 /* need to complete scan in cfg80211 */
720 local
->scan_req
= req
;
728 * Avoid re-scheduling when the sdata is going away.
730 if (!ieee80211_sdata_running(sdata
)) {
736 * as long as no delay is required advance immediately
737 * without scheduling a new work
740 if (!ieee80211_sdata_running(sdata
)) {
745 switch (local
->next_scan_state
) {
747 /* if no more bands/channels left, complete scan */
748 if (local
->scan_channel_idx
>= local
->scan_req
->n_channels
) {
752 ieee80211_scan_state_decision(local
, &next_delay
);
754 case SCAN_SET_CHANNEL
:
755 ieee80211_scan_state_set_channel(local
, &next_delay
);
757 case SCAN_SEND_PROBE
:
758 ieee80211_scan_state_send_probe(local
, &next_delay
);
761 ieee80211_scan_state_suspend(local
, &next_delay
);
764 ieee80211_scan_state_resume(local
, &next_delay
);
770 } while (next_delay
== 0);
772 ieee80211_queue_delayed_work(&local
->hw
, &local
->scan_work
, next_delay
);
776 hw_scan
= test_bit(SCAN_HW_SCANNING
, &local
->scanning
);
777 __ieee80211_scan_completed(&local
->hw
, aborted
, hw_scan
);
779 mutex_unlock(&local
->mtx
);
782 int ieee80211_request_scan(struct ieee80211_sub_if_data
*sdata
,
783 struct cfg80211_scan_request
*req
)
787 mutex_lock(&sdata
->local
->mtx
);
788 res
= __ieee80211_start_scan(sdata
, req
);
789 mutex_unlock(&sdata
->local
->mtx
);
794 int ieee80211_request_ibss_scan(struct ieee80211_sub_if_data
*sdata
,
795 const u8
*ssid
, u8 ssid_len
,
796 struct ieee80211_channel
*chan
)
798 struct ieee80211_local
*local
= sdata
->local
;
800 enum ieee80211_band band
;
802 mutex_lock(&local
->mtx
);
808 /* fill internal scan request */
813 for (band
= 0; band
< IEEE80211_NUM_BANDS
; band
++) {
814 if (!local
->hw
.wiphy
->bands
[band
])
817 max_n
= local
->hw
.wiphy
->bands
[band
]->n_channels
;
818 for (i
= 0; i
< max_n
; i
++) {
819 struct ieee80211_channel
*tmp_ch
=
820 &local
->hw
.wiphy
->bands
[band
]->channels
[i
];
822 if (tmp_ch
->flags
& (IEEE80211_CHAN_NO_IBSS
|
823 IEEE80211_CHAN_DISABLED
))
826 local
->int_scan_req
->channels
[n_ch
] = tmp_ch
;
831 if (WARN_ON_ONCE(n_ch
== 0))
834 local
->int_scan_req
->n_channels
= n_ch
;
836 if (WARN_ON_ONCE(chan
->flags
& (IEEE80211_CHAN_NO_IBSS
|
837 IEEE80211_CHAN_DISABLED
)))
840 local
->int_scan_req
->channels
[0] = chan
;
841 local
->int_scan_req
->n_channels
= 1;
844 local
->int_scan_req
->ssids
= &local
->scan_ssid
;
845 local
->int_scan_req
->n_ssids
= 1;
846 memcpy(local
->int_scan_req
->ssids
[0].ssid
, ssid
, IEEE80211_MAX_SSID_LEN
);
847 local
->int_scan_req
->ssids
[0].ssid_len
= ssid_len
;
849 ret
= __ieee80211_start_scan(sdata
, sdata
->local
->int_scan_req
);
851 mutex_unlock(&local
->mtx
);
856 * Only call this function when a scan can't be queued -- under RTNL.
858 void ieee80211_scan_cancel(struct ieee80211_local
*local
)
861 * We are canceling software scan, or deferred scan that was not
862 * yet really started (see __ieee80211_start_scan ).
864 * Regarding hardware scan:
865 * - we can not call __ieee80211_scan_completed() as when
866 * SCAN_HW_SCANNING bit is set this function change
867 * local->hw_scan_req to operate on 5G band, what race with
868 * driver which can use local->hw_scan_req
870 * - we can not cancel scan_work since driver can schedule it
871 * by ieee80211_scan_completed(..., true) to finish scan
873 * Hence we only call the cancel_hw_scan() callback, but the low-level
874 * driver is still responsible for calling ieee80211_scan_completed()
875 * after the scan was completed/aborted.
878 mutex_lock(&local
->mtx
);
879 if (!local
->scan_req
)
882 if (test_bit(SCAN_HW_SCANNING
, &local
->scanning
)) {
883 if (local
->ops
->cancel_hw_scan
)
884 drv_cancel_hw_scan(local
,
885 rcu_dereference_protected(local
->scan_sdata
,
886 lockdep_is_held(&local
->mtx
)));
891 * If the work is currently running, it must be blocked on
892 * the mutex, but we'll set scan_sdata = NULL and it'll
893 * simply exit once it acquires the mutex.
895 cancel_delayed_work(&local
->scan_work
);
897 __ieee80211_scan_completed(&local
->hw
, true, false);
899 mutex_unlock(&local
->mtx
);
902 int ieee80211_request_sched_scan_start(struct ieee80211_sub_if_data
*sdata
,
903 struct cfg80211_sched_scan_request
*req
)
905 struct ieee80211_local
*local
= sdata
->local
;
906 struct ieee80211_sched_scan_ies sched_scan_ies
= {};
909 iebufsz
= 2 + IEEE80211_MAX_SSID_LEN
+
910 local
->scan_ies_len
+ req
->ie_len
;
912 mutex_lock(&local
->mtx
);
914 if (rcu_access_pointer(local
->sched_scan_sdata
)) {
919 if (!local
->ops
->sched_scan_start
) {
924 for (i
= 0; i
< IEEE80211_NUM_BANDS
; i
++) {
925 if (!local
->hw
.wiphy
->bands
[i
])
928 sched_scan_ies
.ie
[i
] = kzalloc(iebufsz
, GFP_KERNEL
);
929 if (!sched_scan_ies
.ie
[i
]) {
934 sched_scan_ies
.len
[i
] =
935 ieee80211_build_preq_ies(local
, sched_scan_ies
.ie
[i
],
936 iebufsz
, req
->ie
, req
->ie_len
,
940 ret
= drv_sched_scan_start(local
, sdata
, req
, &sched_scan_ies
);
942 rcu_assign_pointer(local
->sched_scan_sdata
, sdata
);
946 kfree(sched_scan_ies
.ie
[--i
]);
948 mutex_unlock(&local
->mtx
);
952 int ieee80211_request_sched_scan_stop(struct ieee80211_sub_if_data
*sdata
)
954 struct ieee80211_local
*local
= sdata
->local
;
957 mutex_lock(&local
->mtx
);
959 if (!local
->ops
->sched_scan_stop
) {
964 if (rcu_access_pointer(local
->sched_scan_sdata
))
965 drv_sched_scan_stop(local
, sdata
);
968 mutex_unlock(&local
->mtx
);
973 void ieee80211_sched_scan_results(struct ieee80211_hw
*hw
)
975 struct ieee80211_local
*local
= hw_to_local(hw
);
977 trace_api_sched_scan_results(local
);
979 cfg80211_sched_scan_results(hw
->wiphy
);
981 EXPORT_SYMBOL(ieee80211_sched_scan_results
);
983 void ieee80211_sched_scan_stopped_work(struct work_struct
*work
)
985 struct ieee80211_local
*local
=
986 container_of(work
, struct ieee80211_local
,
987 sched_scan_stopped_work
);
989 mutex_lock(&local
->mtx
);
991 if (!rcu_access_pointer(local
->sched_scan_sdata
)) {
992 mutex_unlock(&local
->mtx
);
996 rcu_assign_pointer(local
->sched_scan_sdata
, NULL
);
998 mutex_unlock(&local
->mtx
);
1000 cfg80211_sched_scan_stopped(local
->hw
.wiphy
);
1003 void ieee80211_sched_scan_stopped(struct ieee80211_hw
*hw
)
1005 struct ieee80211_local
*local
= hw_to_local(hw
);
1007 trace_api_sched_scan_stopped(local
);
1009 ieee80211_queue_work(&local
->hw
, &local
->sched_scan_stopped_work
);
1011 EXPORT_SYMBOL(ieee80211_sched_scan_stopped
);