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
;
144 struct ieee80211_supported_band
*sband
=
145 local
->hw
.wiphy
->bands
[rx_status
->band
];
146 if (!(rx_status
->flag
& RX_FLAG_HT
) &&
147 !(rx_status
->flag
& RX_FLAG_VHT
))
149 &sband
->bitrates
[rx_status
->rate_idx
];
155 void ieee80211_scan_rx(struct ieee80211_local
*local
, struct sk_buff
*skb
)
157 struct ieee80211_rx_status
*rx_status
= IEEE80211_SKB_RXCB(skb
);
158 struct ieee80211_sub_if_data
*sdata1
, *sdata2
;
159 struct ieee80211_mgmt
*mgmt
= (void *)skb
->data
;
160 struct ieee80211_bss
*bss
;
162 struct ieee80211_channel
*channel
;
164 struct ieee802_11_elems elems
;
167 (!ieee80211_is_probe_resp(mgmt
->frame_control
) &&
168 !ieee80211_is_beacon(mgmt
->frame_control
)))
171 sdata1
= rcu_dereference(local
->scan_sdata
);
172 sdata2
= rcu_dereference(local
->sched_scan_sdata
);
174 if (likely(!sdata1
&& !sdata2
))
177 if (ieee80211_is_probe_resp(mgmt
->frame_control
)) {
178 /* ignore ProbeResp to foreign address */
179 if ((!sdata1
|| !ether_addr_equal(mgmt
->da
, sdata1
->vif
.addr
)) &&
180 (!sdata2
|| !ether_addr_equal(mgmt
->da
, sdata2
->vif
.addr
)))
183 elements
= mgmt
->u
.probe_resp
.variable
;
184 baselen
= offsetof(struct ieee80211_mgmt
, u
.probe_resp
.variable
);
186 baselen
= offsetof(struct ieee80211_mgmt
, u
.beacon
.variable
);
187 elements
= mgmt
->u
.beacon
.variable
;
190 if (baselen
> skb
->len
)
193 ieee802_11_parse_elems(elements
, skb
->len
- baselen
, false, &elems
);
195 channel
= ieee80211_get_channel(local
->hw
.wiphy
, rx_status
->freq
);
197 if (!channel
|| channel
->flags
& IEEE80211_CHAN_DISABLED
)
200 bss
= ieee80211_bss_info_update(local
, rx_status
,
201 mgmt
, skb
->len
, &elems
,
204 ieee80211_rx_bss_put(local
, bss
);
207 /* return false if no more work */
208 static bool ieee80211_prep_hw_scan(struct ieee80211_local
*local
)
210 struct cfg80211_scan_request
*req
= local
->scan_req
;
211 enum ieee80211_band band
;
212 int i
, ielen
, n_chans
;
215 if (local
->hw_scan_band
== IEEE80211_NUM_BANDS
)
218 band
= local
->hw_scan_band
;
220 for (i
= 0; i
< req
->n_channels
; i
++) {
221 if (req
->channels
[i
]->band
== band
) {
222 local
->hw_scan_req
->channels
[n_chans
] =
228 local
->hw_scan_band
++;
231 local
->hw_scan_req
->n_channels
= n_chans
;
233 ielen
= ieee80211_build_preq_ies(local
, (u8
*)local
->hw_scan_req
->ie
,
234 local
->hw_scan_ies_bufsize
,
235 req
->ie
, req
->ie_len
, band
,
236 req
->rates
[band
], 0);
237 local
->hw_scan_req
->ie_len
= ielen
;
238 local
->hw_scan_req
->no_cck
= req
->no_cck
;
243 static void __ieee80211_scan_completed(struct ieee80211_hw
*hw
, bool aborted
,
246 struct ieee80211_local
*local
= hw_to_local(hw
);
248 lockdep_assert_held(&local
->mtx
);
251 * It's ok to abort a not-yet-running scan (that
252 * we have one at all will be verified by checking
253 * local->scan_req next), but not to complete it
256 if (WARN_ON(!local
->scanning
&& !aborted
))
259 if (WARN_ON(!local
->scan_req
))
262 if (was_hw_scan
&& !aborted
&& ieee80211_prep_hw_scan(local
)) {
265 rc
= drv_hw_scan(local
,
266 rcu_dereference_protected(local
->scan_sdata
,
267 lockdep_is_held(&local
->mtx
)),
274 kfree(local
->hw_scan_req
);
275 local
->hw_scan_req
= NULL
;
277 if (local
->scan_req
!= local
->int_scan_req
)
278 cfg80211_scan_done(local
->scan_req
, aborted
);
279 local
->scan_req
= NULL
;
280 rcu_assign_pointer(local
->scan_sdata
, NULL
);
283 local
->scan_channel
= NULL
;
285 /* Set power back to normal operating levels. */
286 ieee80211_hw_config(local
, 0);
289 ieee80211_configure_filter(local
);
290 drv_sw_scan_complete(local
);
291 ieee80211_offchannel_return(local
);
294 ieee80211_recalc_idle(local
);
296 ieee80211_mlme_notify_scan_completed(local
);
297 ieee80211_ibss_notify_scan_completed(local
);
298 ieee80211_mesh_notify_scan_completed(local
);
299 ieee80211_start_next_roc(local
);
302 void ieee80211_scan_completed(struct ieee80211_hw
*hw
, bool aborted
)
304 struct ieee80211_local
*local
= hw_to_local(hw
);
306 trace_api_scan_completed(local
, aborted
);
308 set_bit(SCAN_COMPLETED
, &local
->scanning
);
310 set_bit(SCAN_ABORTED
, &local
->scanning
);
311 ieee80211_queue_delayed_work(&local
->hw
, &local
->scan_work
, 0);
313 EXPORT_SYMBOL(ieee80211_scan_completed
);
315 static int ieee80211_start_sw_scan(struct ieee80211_local
*local
)
317 /* Software scan is not supported in multi-channel cases */
318 if (local
->use_chanctx
)
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 local
->leave_oper_channel_time
= jiffies
;
337 local
->next_scan_state
= SCAN_DECISION
;
338 local
->scan_channel_idx
= 0;
340 ieee80211_offchannel_stop_vifs(local
);
342 /* ensure nullfunc is transmitted before leaving operating channel */
343 ieee80211_flush_queues(local
, NULL
);
345 ieee80211_configure_filter(local
);
347 /* We need to set power level at maximum rate for scanning. */
348 ieee80211_hw_config(local
, 0);
350 ieee80211_queue_delayed_work(&local
->hw
,
351 &local
->scan_work
, 0);
356 static bool ieee80211_can_scan(struct ieee80211_local
*local
,
357 struct ieee80211_sub_if_data
*sdata
)
359 if (local
->radar_detect_enabled
)
362 if (!list_empty(&local
->roc_list
))
365 if (sdata
->vif
.type
== NL80211_IFTYPE_STATION
&&
366 sdata
->u
.mgd
.flags
& (IEEE80211_STA_BEACON_POLL
|
367 IEEE80211_STA_CONNECTION_POLL
))
373 void ieee80211_run_deferred_scan(struct ieee80211_local
*local
)
375 lockdep_assert_held(&local
->mtx
);
377 if (!local
->scan_req
|| local
->scanning
)
380 if (!ieee80211_can_scan(local
,
381 rcu_dereference_protected(
383 lockdep_is_held(&local
->mtx
))))
386 ieee80211_queue_delayed_work(&local
->hw
, &local
->scan_work
,
387 round_jiffies_relative(0));
390 static void ieee80211_scan_state_send_probe(struct ieee80211_local
*local
,
391 unsigned long *next_delay
)
394 struct ieee80211_sub_if_data
*sdata
;
395 enum ieee80211_band band
= local
->hw
.conf
.chandef
.chan
->band
;
398 tx_flags
= IEEE80211_TX_INTFL_OFFCHAN_TX_OK
;
399 if (local
->scan_req
->no_cck
)
400 tx_flags
|= IEEE80211_TX_CTL_NO_CCK_RATE
;
402 sdata
= rcu_dereference_protected(local
->scan_sdata
,
403 lockdep_is_held(&local
->mtx
));
405 for (i
= 0; i
< local
->scan_req
->n_ssids
; i
++)
406 ieee80211_send_probe_req(
408 local
->scan_req
->ssids
[i
].ssid
,
409 local
->scan_req
->ssids
[i
].ssid_len
,
410 local
->scan_req
->ie
, local
->scan_req
->ie_len
,
411 local
->scan_req
->rates
[band
], false,
412 tx_flags
, local
->hw
.conf
.chandef
.chan
, true);
415 * After sending probe requests, wait for probe responses
418 *next_delay
= IEEE80211_CHANNEL_TIME
;
419 local
->next_scan_state
= SCAN_DECISION
;
422 static int __ieee80211_start_scan(struct ieee80211_sub_if_data
*sdata
,
423 struct cfg80211_scan_request
*req
)
425 struct ieee80211_local
*local
= sdata
->local
;
428 lockdep_assert_held(&local
->mtx
);
433 if (!ieee80211_can_scan(local
, sdata
)) {
434 /* wait for the work to finish/time out */
435 local
->scan_req
= req
;
436 rcu_assign_pointer(local
->scan_sdata
, sdata
);
440 if (local
->ops
->hw_scan
) {
443 local
->hw_scan_ies_bufsize
= 2 + IEEE80211_MAX_SSID_LEN
+
444 local
->scan_ies_len
+
446 local
->hw_scan_req
= kmalloc(
447 sizeof(*local
->hw_scan_req
) +
448 req
->n_channels
* sizeof(req
->channels
[0]) +
449 local
->hw_scan_ies_bufsize
, GFP_KERNEL
);
450 if (!local
->hw_scan_req
)
453 local
->hw_scan_req
->ssids
= req
->ssids
;
454 local
->hw_scan_req
->n_ssids
= req
->n_ssids
;
455 ies
= (u8
*)local
->hw_scan_req
+
456 sizeof(*local
->hw_scan_req
) +
457 req
->n_channels
* sizeof(req
->channels
[0]);
458 local
->hw_scan_req
->ie
= ies
;
459 local
->hw_scan_req
->flags
= req
->flags
;
461 local
->hw_scan_band
= 0;
464 * After allocating local->hw_scan_req, we must
465 * go through until ieee80211_prep_hw_scan(), so
466 * anything that might be changed here and leave
467 * this function early must not go after this
472 local
->scan_req
= req
;
473 rcu_assign_pointer(local
->scan_sdata
, sdata
);
475 if (local
->ops
->hw_scan
) {
476 __set_bit(SCAN_HW_SCANNING
, &local
->scanning
);
477 } else if ((req
->n_channels
== 1) &&
478 (req
->channels
[0] == local
->_oper_chandef
.chan
)) {
480 * If we are scanning only on the operating channel
481 * then we do not need to stop normal activities
483 unsigned long next_delay
;
485 __set_bit(SCAN_ONCHANNEL_SCANNING
, &local
->scanning
);
487 ieee80211_recalc_idle(local
);
489 /* Notify driver scan is starting, keep order of operations
490 * same as normal software scan, in case that matters. */
491 drv_sw_scan_start(local
);
493 ieee80211_configure_filter(local
); /* accept probe-responses */
495 /* We need to ensure power level is at max for scanning. */
496 ieee80211_hw_config(local
, 0);
498 if ((req
->channels
[0]->flags
&
499 IEEE80211_CHAN_PASSIVE_SCAN
) ||
500 !local
->scan_req
->n_ssids
) {
501 next_delay
= IEEE80211_PASSIVE_CHANNEL_TIME
;
503 ieee80211_scan_state_send_probe(local
, &next_delay
);
504 next_delay
= IEEE80211_CHANNEL_TIME
;
507 /* Now, just wait a bit and we are all done! */
508 ieee80211_queue_delayed_work(&local
->hw
, &local
->scan_work
,
512 /* Do normal software scan */
513 __set_bit(SCAN_SW_SCANNING
, &local
->scanning
);
516 ieee80211_recalc_idle(local
);
518 if (local
->ops
->hw_scan
) {
519 WARN_ON(!ieee80211_prep_hw_scan(local
));
520 rc
= drv_hw_scan(local
, sdata
, local
->hw_scan_req
);
522 rc
= ieee80211_start_sw_scan(local
);
525 kfree(local
->hw_scan_req
);
526 local
->hw_scan_req
= NULL
;
529 ieee80211_recalc_idle(local
);
531 local
->scan_req
= NULL
;
532 rcu_assign_pointer(local
->scan_sdata
, NULL
);
539 ieee80211_scan_get_channel_time(struct ieee80211_channel
*chan
)
542 * TODO: channel switching also consumes quite some time,
543 * add that delay as well to get a better estimation
545 if (chan
->flags
& IEEE80211_CHAN_PASSIVE_SCAN
)
546 return IEEE80211_PASSIVE_CHANNEL_TIME
;
547 return IEEE80211_PROBE_DELAY
+ IEEE80211_CHANNEL_TIME
;
550 static void ieee80211_scan_state_decision(struct ieee80211_local
*local
,
551 unsigned long *next_delay
)
553 bool associated
= false;
554 bool tx_empty
= true;
556 struct ieee80211_sub_if_data
*sdata
;
557 struct ieee80211_channel
*next_chan
;
558 enum mac80211_scan_state next_scan_state
;
561 * check if at least one STA interface is associated,
562 * check if at least one STA interface has pending tx frames
563 * and grab the lowest used beacon interval
565 mutex_lock(&local
->iflist_mtx
);
566 list_for_each_entry(sdata
, &local
->interfaces
, list
) {
567 if (!ieee80211_sdata_running(sdata
))
570 if (sdata
->vif
.type
== NL80211_IFTYPE_STATION
) {
571 if (sdata
->u
.mgd
.associated
) {
574 if (!qdisc_all_tx_empty(sdata
->dev
)) {
581 mutex_unlock(&local
->iflist_mtx
);
583 next_chan
= local
->scan_req
->channels
[local
->scan_channel_idx
];
586 * we're currently scanning a different channel, let's
587 * see if we can scan another channel without interfering
588 * with the current traffic situation.
590 * Keep good latency, do not stay off-channel more than 125 ms.
593 bad_latency
= time_after(jiffies
+
594 ieee80211_scan_get_channel_time(next_chan
),
595 local
->leave_oper_channel_time
+ HZ
/ 8);
597 if (associated
&& !tx_empty
) {
598 if (local
->scan_req
->flags
& NL80211_SCAN_FLAG_LOW_PRIORITY
)
599 next_scan_state
= SCAN_ABORT
;
601 next_scan_state
= SCAN_SUSPEND
;
602 } else if (associated
&& bad_latency
) {
603 next_scan_state
= SCAN_SUSPEND
;
605 next_scan_state
= SCAN_SET_CHANNEL
;
608 local
->next_scan_state
= next_scan_state
;
613 static void ieee80211_scan_state_set_channel(struct ieee80211_local
*local
,
614 unsigned long *next_delay
)
617 struct ieee80211_channel
*chan
;
620 chan
= local
->scan_req
->channels
[local
->scan_channel_idx
];
622 local
->scan_channel
= chan
;
624 if (ieee80211_hw_config(local
, IEEE80211_CONF_CHANGE_CHANNEL
))
627 /* advance state machine to next channel/band */
628 local
->scan_channel_idx
++;
631 /* if we skip this channel return to the decision state */
632 local
->next_scan_state
= SCAN_DECISION
;
637 * Probe delay is used to update the NAV, cf. 11.1.3.2.2
638 * (which unfortunately doesn't say _why_ step a) is done,
639 * but it waits for the probe delay or until a frame is
640 * received - and the received frame would update the NAV).
641 * For now, we do not support waiting until a frame is
644 * In any case, it is not necessary for a passive scan.
646 if (chan
->flags
& IEEE80211_CHAN_PASSIVE_SCAN
||
647 !local
->scan_req
->n_ssids
) {
648 *next_delay
= IEEE80211_PASSIVE_CHANNEL_TIME
;
649 local
->next_scan_state
= SCAN_DECISION
;
653 /* active scan, send probes */
654 *next_delay
= IEEE80211_PROBE_DELAY
;
655 local
->next_scan_state
= SCAN_SEND_PROBE
;
658 static void ieee80211_scan_state_suspend(struct ieee80211_local
*local
,
659 unsigned long *next_delay
)
661 /* switch back to the operating channel */
662 local
->scan_channel
= NULL
;
663 ieee80211_hw_config(local
, IEEE80211_CONF_CHANGE_CHANNEL
);
666 ieee80211_offchannel_return(local
);
668 *next_delay
= HZ
/ 5;
669 /* afterwards, resume scan & go to next channel */
670 local
->next_scan_state
= SCAN_RESUME
;
673 static void ieee80211_scan_state_resume(struct ieee80211_local
*local
,
674 unsigned long *next_delay
)
676 ieee80211_offchannel_stop_vifs(local
);
678 if (local
->ops
->flush
) {
679 ieee80211_flush_queues(local
, NULL
);
682 *next_delay
= HZ
/ 10;
684 /* remember when we left the operating channel */
685 local
->leave_oper_channel_time
= jiffies
;
687 /* advance to the next channel to be scanned */
688 local
->next_scan_state
= SCAN_SET_CHANNEL
;
691 void ieee80211_scan_work(struct work_struct
*work
)
693 struct ieee80211_local
*local
=
694 container_of(work
, struct ieee80211_local
, scan_work
.work
);
695 struct ieee80211_sub_if_data
*sdata
;
696 unsigned long next_delay
= 0;
697 bool aborted
, hw_scan
;
699 mutex_lock(&local
->mtx
);
701 sdata
= rcu_dereference_protected(local
->scan_sdata
,
702 lockdep_is_held(&local
->mtx
));
704 /* When scanning on-channel, the first-callback means completed. */
705 if (test_bit(SCAN_ONCHANNEL_SCANNING
, &local
->scanning
)) {
706 aborted
= test_and_clear_bit(SCAN_ABORTED
, &local
->scanning
);
710 if (test_and_clear_bit(SCAN_COMPLETED
, &local
->scanning
)) {
711 aborted
= test_and_clear_bit(SCAN_ABORTED
, &local
->scanning
);
715 if (!sdata
|| !local
->scan_req
)
718 if (local
->scan_req
&& !local
->scanning
) {
719 struct cfg80211_scan_request
*req
= local
->scan_req
;
722 local
->scan_req
= NULL
;
723 rcu_assign_pointer(local
->scan_sdata
, NULL
);
725 rc
= __ieee80211_start_scan(sdata
, req
);
727 /* need to complete scan in cfg80211 */
728 local
->scan_req
= req
;
736 * Avoid re-scheduling when the sdata is going away.
738 if (!ieee80211_sdata_running(sdata
)) {
744 * as long as no delay is required advance immediately
745 * without scheduling a new work
748 if (!ieee80211_sdata_running(sdata
)) {
753 switch (local
->next_scan_state
) {
755 /* if no more bands/channels left, complete scan */
756 if (local
->scan_channel_idx
>= local
->scan_req
->n_channels
) {
760 ieee80211_scan_state_decision(local
, &next_delay
);
762 case SCAN_SET_CHANNEL
:
763 ieee80211_scan_state_set_channel(local
, &next_delay
);
765 case SCAN_SEND_PROBE
:
766 ieee80211_scan_state_send_probe(local
, &next_delay
);
769 ieee80211_scan_state_suspend(local
, &next_delay
);
772 ieee80211_scan_state_resume(local
, &next_delay
);
778 } while (next_delay
== 0);
780 ieee80211_queue_delayed_work(&local
->hw
, &local
->scan_work
, next_delay
);
784 hw_scan
= test_bit(SCAN_HW_SCANNING
, &local
->scanning
);
785 __ieee80211_scan_completed(&local
->hw
, aborted
, hw_scan
);
787 mutex_unlock(&local
->mtx
);
790 int ieee80211_request_scan(struct ieee80211_sub_if_data
*sdata
,
791 struct cfg80211_scan_request
*req
)
795 mutex_lock(&sdata
->local
->mtx
);
796 res
= __ieee80211_start_scan(sdata
, req
);
797 mutex_unlock(&sdata
->local
->mtx
);
802 int ieee80211_request_ibss_scan(struct ieee80211_sub_if_data
*sdata
,
803 const u8
*ssid
, u8 ssid_len
,
804 struct ieee80211_channel
*chan
)
806 struct ieee80211_local
*local
= sdata
->local
;
808 enum ieee80211_band band
;
810 mutex_lock(&local
->mtx
);
816 /* fill internal scan request */
821 for (band
= 0; band
< IEEE80211_NUM_BANDS
; band
++) {
822 if (!local
->hw
.wiphy
->bands
[band
])
825 max_n
= local
->hw
.wiphy
->bands
[band
]->n_channels
;
826 for (i
= 0; i
< max_n
; i
++) {
827 struct ieee80211_channel
*tmp_ch
=
828 &local
->hw
.wiphy
->bands
[band
]->channels
[i
];
830 if (tmp_ch
->flags
& (IEEE80211_CHAN_NO_IBSS
|
831 IEEE80211_CHAN_DISABLED
))
834 local
->int_scan_req
->channels
[n_ch
] = tmp_ch
;
839 if (WARN_ON_ONCE(n_ch
== 0))
842 local
->int_scan_req
->n_channels
= n_ch
;
844 if (WARN_ON_ONCE(chan
->flags
& (IEEE80211_CHAN_NO_IBSS
|
845 IEEE80211_CHAN_DISABLED
)))
848 local
->int_scan_req
->channels
[0] = chan
;
849 local
->int_scan_req
->n_channels
= 1;
852 local
->int_scan_req
->ssids
= &local
->scan_ssid
;
853 local
->int_scan_req
->n_ssids
= 1;
854 memcpy(local
->int_scan_req
->ssids
[0].ssid
, ssid
, IEEE80211_MAX_SSID_LEN
);
855 local
->int_scan_req
->ssids
[0].ssid_len
= ssid_len
;
857 ret
= __ieee80211_start_scan(sdata
, sdata
->local
->int_scan_req
);
859 mutex_unlock(&local
->mtx
);
864 * Only call this function when a scan can't be queued -- under RTNL.
866 void ieee80211_scan_cancel(struct ieee80211_local
*local
)
869 * We are canceling software scan, or deferred scan that was not
870 * yet really started (see __ieee80211_start_scan ).
872 * Regarding hardware scan:
873 * - we can not call __ieee80211_scan_completed() as when
874 * SCAN_HW_SCANNING bit is set this function change
875 * local->hw_scan_req to operate on 5G band, what race with
876 * driver which can use local->hw_scan_req
878 * - we can not cancel scan_work since driver can schedule it
879 * by ieee80211_scan_completed(..., true) to finish scan
881 * Hence we only call the cancel_hw_scan() callback, but the low-level
882 * driver is still responsible for calling ieee80211_scan_completed()
883 * after the scan was completed/aborted.
886 mutex_lock(&local
->mtx
);
887 if (!local
->scan_req
)
890 if (test_bit(SCAN_HW_SCANNING
, &local
->scanning
)) {
891 if (local
->ops
->cancel_hw_scan
)
892 drv_cancel_hw_scan(local
,
893 rcu_dereference_protected(local
->scan_sdata
,
894 lockdep_is_held(&local
->mtx
)));
899 * If the work is currently running, it must be blocked on
900 * the mutex, but we'll set scan_sdata = NULL and it'll
901 * simply exit once it acquires the mutex.
903 cancel_delayed_work(&local
->scan_work
);
905 __ieee80211_scan_completed(&local
->hw
, true, false);
907 mutex_unlock(&local
->mtx
);
910 int ieee80211_request_sched_scan_start(struct ieee80211_sub_if_data
*sdata
,
911 struct cfg80211_sched_scan_request
*req
)
913 struct ieee80211_local
*local
= sdata
->local
;
914 struct ieee80211_sched_scan_ies sched_scan_ies
= {};
917 iebufsz
= 2 + IEEE80211_MAX_SSID_LEN
+
918 local
->scan_ies_len
+ req
->ie_len
;
920 mutex_lock(&local
->mtx
);
922 if (rcu_access_pointer(local
->sched_scan_sdata
)) {
927 if (!local
->ops
->sched_scan_start
) {
932 for (i
= 0; i
< IEEE80211_NUM_BANDS
; i
++) {
933 if (!local
->hw
.wiphy
->bands
[i
])
936 sched_scan_ies
.ie
[i
] = kzalloc(iebufsz
, GFP_KERNEL
);
937 if (!sched_scan_ies
.ie
[i
]) {
942 sched_scan_ies
.len
[i
] =
943 ieee80211_build_preq_ies(local
, sched_scan_ies
.ie
[i
],
944 iebufsz
, req
->ie
, req
->ie_len
,
948 ret
= drv_sched_scan_start(local
, sdata
, req
, &sched_scan_ies
);
950 rcu_assign_pointer(local
->sched_scan_sdata
, sdata
);
954 kfree(sched_scan_ies
.ie
[--i
]);
956 mutex_unlock(&local
->mtx
);
960 int ieee80211_request_sched_scan_stop(struct ieee80211_sub_if_data
*sdata
)
962 struct ieee80211_local
*local
= sdata
->local
;
965 mutex_lock(&local
->mtx
);
967 if (!local
->ops
->sched_scan_stop
) {
972 if (rcu_access_pointer(local
->sched_scan_sdata
))
973 drv_sched_scan_stop(local
, sdata
);
976 mutex_unlock(&local
->mtx
);
981 void ieee80211_sched_scan_results(struct ieee80211_hw
*hw
)
983 struct ieee80211_local
*local
= hw_to_local(hw
);
985 trace_api_sched_scan_results(local
);
987 cfg80211_sched_scan_results(hw
->wiphy
);
989 EXPORT_SYMBOL(ieee80211_sched_scan_results
);
991 void ieee80211_sched_scan_stopped_work(struct work_struct
*work
)
993 struct ieee80211_local
*local
=
994 container_of(work
, struct ieee80211_local
,
995 sched_scan_stopped_work
);
997 mutex_lock(&local
->mtx
);
999 if (!rcu_access_pointer(local
->sched_scan_sdata
)) {
1000 mutex_unlock(&local
->mtx
);
1004 rcu_assign_pointer(local
->sched_scan_sdata
, NULL
);
1006 mutex_unlock(&local
->mtx
);
1008 cfg80211_sched_scan_stopped(local
->hw
.wiphy
);
1011 void ieee80211_sched_scan_stopped(struct ieee80211_hw
*hw
)
1013 struct ieee80211_local
*local
= hw_to_local(hw
);
1015 trace_api_sched_scan_stopped(local
);
1017 ieee80211_queue_work(&local
->hw
, &local
->sched_scan_stopped_work
);
1019 EXPORT_SYMBOL(ieee80211_sched_scan_stopped
);