2 * Scanning implementation
4 * Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi>
5 * Copyright 2004, Instant802 Networks, Inc.
6 * Copyright 2005, Devicescape Software, Inc.
7 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
8 * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
15 #include <linux/if_arp.h>
16 #include <linux/rtnetlink.h>
17 #include <linux/pm_qos.h>
18 #include <net/sch_generic.h>
19 #include <linux/slab.h>
20 #include <linux/export.h>
21 #include <net/mac80211.h>
23 #include "ieee80211_i.h"
24 #include "driver-ops.h"
27 #define IEEE80211_PROBE_DELAY (HZ / 33)
28 #define IEEE80211_CHANNEL_TIME (HZ / 33)
29 #define IEEE80211_PASSIVE_CHANNEL_TIME (HZ / 8)
31 struct ieee80211_bss
*
32 ieee80211_rx_bss_get(struct ieee80211_local
*local
, u8
*bssid
, int freq
,
33 u8
*ssid
, u8 ssid_len
)
35 struct cfg80211_bss
*cbss
;
37 cbss
= cfg80211_get_bss(local
->hw
.wiphy
,
38 ieee80211_get_channel(local
->hw
.wiphy
, freq
),
39 bssid
, ssid
, ssid_len
, 0, 0);
42 return (void *)cbss
->priv
;
45 static void ieee80211_rx_bss_free(struct cfg80211_bss
*cbss
)
47 struct ieee80211_bss
*bss
= (void *)cbss
->priv
;
49 kfree(bss_mesh_id(bss
));
50 kfree(bss_mesh_cfg(bss
));
53 void ieee80211_rx_bss_put(struct ieee80211_local
*local
,
54 struct ieee80211_bss
*bss
)
58 cfg80211_put_bss(container_of((void *)bss
, struct cfg80211_bss
, priv
));
61 static bool is_uapsd_supported(struct ieee802_11_elems
*elems
)
65 if (elems
->wmm_info
&& elems
->wmm_info_len
== 7
66 && elems
->wmm_info
[5] == 1)
67 qos_info
= elems
->wmm_info
[6];
68 else if (elems
->wmm_param
&& elems
->wmm_param_len
== 24
69 && elems
->wmm_param
[5] == 1)
70 qos_info
= elems
->wmm_param
[6];
72 /* no valid wmm information or parameter element found */
75 return qos_info
& IEEE80211_WMM_IE_AP_QOSINFO_UAPSD
;
78 struct ieee80211_bss
*
79 ieee80211_bss_info_update(struct ieee80211_local
*local
,
80 struct ieee80211_rx_status
*rx_status
,
81 struct ieee80211_mgmt
*mgmt
,
83 struct ieee802_11_elems
*elems
,
84 struct ieee80211_channel
*channel
,
87 struct cfg80211_bss
*cbss
;
88 struct ieee80211_bss
*bss
;
92 if (local
->hw
.flags
& IEEE80211_HW_SIGNAL_DBM
)
93 signal
= rx_status
->signal
* 100;
94 else if (local
->hw
.flags
& IEEE80211_HW_SIGNAL_UNSPEC
)
95 signal
= (rx_status
->signal
* 100) / local
->hw
.max_signal
;
97 cbss
= cfg80211_inform_bss_frame(local
->hw
.wiphy
, channel
,
98 mgmt
, len
, signal
, GFP_ATOMIC
);
103 cbss
->free_priv
= ieee80211_rx_bss_free
;
104 bss
= (void *)cbss
->priv
;
106 /* save the ERP value so that it is available at association time */
107 if (elems
->erp_info
&& elems
->erp_info_len
>= 1) {
108 bss
->erp_value
= elems
->erp_info
[0];
109 bss
->has_erp_value
= 1;
113 struct ieee80211_tim_ie
*tim_ie
=
114 (struct ieee80211_tim_ie
*)elems
->tim
;
115 bss
->dtim_period
= tim_ie
->dtim_period
;
118 /* If the beacon had no TIM IE, or it was invalid, use 1 */
119 if (beacon
&& !bss
->dtim_period
)
120 bss
->dtim_period
= 1;
122 /* replace old supported rates if we get new values */
124 if (elems
->supp_rates
) {
125 clen
= IEEE80211_MAX_SUPP_RATES
;
126 if (clen
> elems
->supp_rates_len
)
127 clen
= elems
->supp_rates_len
;
128 memcpy(bss
->supp_rates
, elems
->supp_rates
, clen
);
131 if (elems
->ext_supp_rates
) {
132 clen
= IEEE80211_MAX_SUPP_RATES
- srlen
;
133 if (clen
> elems
->ext_supp_rates_len
)
134 clen
= elems
->ext_supp_rates_len
;
135 memcpy(bss
->supp_rates
+ srlen
, elems
->ext_supp_rates
, clen
);
139 bss
->supp_rates_len
= srlen
;
141 bss
->wmm_used
= elems
->wmm_param
|| elems
->wmm_info
;
142 bss
->uapsd_supported
= is_uapsd_supported(elems
);
145 bss
->last_probe_resp
= jiffies
;
151 ieee80211_scan_rx(struct ieee80211_sub_if_data
*sdata
, struct sk_buff
*skb
)
153 struct ieee80211_rx_status
*rx_status
= IEEE80211_SKB_RXCB(skb
);
154 struct ieee80211_mgmt
*mgmt
;
155 struct ieee80211_bss
*bss
;
157 struct ieee80211_channel
*channel
;
161 bool presp
, beacon
= false;
162 struct ieee802_11_elems elems
;
165 return RX_DROP_UNUSABLE
;
167 mgmt
= (struct ieee80211_mgmt
*) skb
->data
;
168 fc
= mgmt
->frame_control
;
170 if (ieee80211_is_ctl(fc
))
176 presp
= ieee80211_is_probe_resp(fc
);
178 /* ignore ProbeResp to foreign address */
179 if (memcmp(mgmt
->da
, sdata
->vif
.addr
, ETH_ALEN
))
180 return RX_DROP_MONITOR
;
183 elements
= mgmt
->u
.probe_resp
.variable
;
184 baselen
= offsetof(struct ieee80211_mgmt
, u
.probe_resp
.variable
);
186 beacon
= ieee80211_is_beacon(fc
);
187 baselen
= offsetof(struct ieee80211_mgmt
, u
.beacon
.variable
);
188 elements
= mgmt
->u
.beacon
.variable
;
191 if (!presp
&& !beacon
)
194 if (baselen
> skb
->len
)
195 return RX_DROP_MONITOR
;
197 ieee802_11_parse_elems(elements
, skb
->len
- baselen
, &elems
);
199 if (elems
.ds_params
&& elems
.ds_params_len
== 1)
200 freq
= ieee80211_channel_to_frequency(elems
.ds_params
[0],
203 freq
= rx_status
->freq
;
205 channel
= ieee80211_get_channel(sdata
->local
->hw
.wiphy
, freq
);
207 if (!channel
|| channel
->flags
& IEEE80211_CHAN_DISABLED
)
208 return RX_DROP_MONITOR
;
210 bss
= ieee80211_bss_info_update(sdata
->local
, rx_status
,
211 mgmt
, skb
->len
, &elems
,
214 ieee80211_rx_bss_put(sdata
->local
, bss
);
216 /* If we are on-operating-channel, and this packet is for the
217 * current channel, pass the pkt on up the stack so that
218 * the rest of the stack can make use of it.
220 if (ieee80211_cfg_on_oper_channel(sdata
->local
)
221 && (channel
== sdata
->local
->oper_channel
))
228 /* return false if no more work */
229 static bool ieee80211_prep_hw_scan(struct ieee80211_local
*local
)
231 struct cfg80211_scan_request
*req
= local
->scan_req
;
232 enum ieee80211_band band
;
233 int i
, ielen
, n_chans
;
236 if (local
->hw_scan_band
== IEEE80211_NUM_BANDS
)
239 band
= local
->hw_scan_band
;
241 for (i
= 0; i
< req
->n_channels
; i
++) {
242 if (req
->channels
[i
]->band
== band
) {
243 local
->hw_scan_req
->channels
[n_chans
] =
249 local
->hw_scan_band
++;
252 local
->hw_scan_req
->n_channels
= n_chans
;
254 ielen
= ieee80211_build_preq_ies(local
, (u8
*)local
->hw_scan_req
->ie
,
255 req
->ie
, req
->ie_len
, band
,
256 req
->rates
[band
], 0);
257 local
->hw_scan_req
->ie_len
= ielen
;
258 local
->hw_scan_req
->no_cck
= req
->no_cck
;
263 static void __ieee80211_scan_completed(struct ieee80211_hw
*hw
, bool aborted
,
266 struct ieee80211_local
*local
= hw_to_local(hw
);
268 bool enable_beacons
= false;
270 lockdep_assert_held(&local
->mtx
);
273 * It's ok to abort a not-yet-running scan (that
274 * we have one at all will be verified by checking
275 * local->scan_req next), but not to complete it
278 if (WARN_ON(!local
->scanning
&& !aborted
))
281 if (WARN_ON(!local
->scan_req
))
284 if (was_hw_scan
&& !aborted
&& ieee80211_prep_hw_scan(local
)) {
285 int rc
= drv_hw_scan(local
, local
->scan_sdata
, local
->hw_scan_req
);
290 kfree(local
->hw_scan_req
);
291 local
->hw_scan_req
= NULL
;
293 if (local
->scan_req
!= local
->int_scan_req
)
294 cfg80211_scan_done(local
->scan_req
, aborted
);
295 local
->scan_req
= NULL
;
296 local
->scan_sdata
= NULL
;
299 local
->scan_channel
= NULL
;
301 on_oper_chan
= ieee80211_cfg_on_oper_channel(local
);
303 if (was_hw_scan
|| !on_oper_chan
)
304 ieee80211_hw_config(local
, IEEE80211_CONF_CHANGE_CHANNEL
);
306 /* Set power back to normal operating levels. */
307 ieee80211_hw_config(local
, 0);
311 ieee80211_configure_filter(local
);
312 drv_sw_scan_complete(local
);
313 on_oper_chan2
= ieee80211_cfg_on_oper_channel(local
);
314 /* We should always be on-channel at this point. */
315 WARN_ON(!on_oper_chan2
);
316 if (on_oper_chan2
&& (on_oper_chan
!= on_oper_chan2
))
317 enable_beacons
= true;
319 ieee80211_offchannel_return(local
, enable_beacons
, true);
322 ieee80211_recalc_idle(local
);
324 ieee80211_mlme_notify_scan_completed(local
);
325 ieee80211_ibss_notify_scan_completed(local
);
326 ieee80211_mesh_notify_scan_completed(local
);
327 ieee80211_queue_work(&local
->hw
, &local
->work_work
);
330 void ieee80211_scan_completed(struct ieee80211_hw
*hw
, bool aborted
)
332 struct ieee80211_local
*local
= hw_to_local(hw
);
334 trace_api_scan_completed(local
, aborted
);
336 set_bit(SCAN_COMPLETED
, &local
->scanning
);
338 set_bit(SCAN_ABORTED
, &local
->scanning
);
339 ieee80211_queue_delayed_work(&local
->hw
, &local
->scan_work
, 0);
341 EXPORT_SYMBOL(ieee80211_scan_completed
);
343 static int ieee80211_start_sw_scan(struct ieee80211_local
*local
)
346 * Hardware/driver doesn't support hw_scan, so use software
347 * scanning instead. First send a nullfunc frame with power save
348 * bit on so that AP will buffer the frames for us while we are not
349 * listening, then send probe requests to each channel and wait for
350 * the responses. After all channels are scanned, tune back to the
351 * original channel and send a nullfunc frame with power save bit
352 * off to trigger the AP to send us all the buffered frames.
354 * Note that while local->sw_scanning is true everything else but
355 * nullfunc frames and probe requests will be dropped in
356 * ieee80211_tx_h_check_assoc().
358 drv_sw_scan_start(local
);
360 local
->leave_oper_channel_time
= 0;
361 local
->next_scan_state
= SCAN_DECISION
;
362 local
->scan_channel_idx
= 0;
364 /* We always want to use off-channel PS, even if we
365 * are not really leaving oper-channel. Don't
366 * tell the AP though, as long as we are on-channel.
368 ieee80211_offchannel_enable_all_ps(local
, false);
370 ieee80211_configure_filter(local
);
372 /* We need to set power level at maximum rate for scanning. */
373 ieee80211_hw_config(local
, 0);
375 ieee80211_queue_delayed_work(&local
->hw
,
377 IEEE80211_CHANNEL_TIME
);
383 static int __ieee80211_start_scan(struct ieee80211_sub_if_data
*sdata
,
384 struct cfg80211_scan_request
*req
)
386 struct ieee80211_local
*local
= sdata
->local
;
389 lockdep_assert_held(&local
->mtx
);
394 if (!list_empty(&local
->work_list
)) {
395 /* wait for the work to finish/time out */
396 local
->scan_req
= req
;
397 local
->scan_sdata
= sdata
;
401 if (local
->ops
->hw_scan
) {
404 local
->hw_scan_req
= kmalloc(
405 sizeof(*local
->hw_scan_req
) +
406 req
->n_channels
* sizeof(req
->channels
[0]) +
407 2 + IEEE80211_MAX_SSID_LEN
+ local
->scan_ies_len
+
408 req
->ie_len
, GFP_KERNEL
);
409 if (!local
->hw_scan_req
)
412 local
->hw_scan_req
->ssids
= req
->ssids
;
413 local
->hw_scan_req
->n_ssids
= req
->n_ssids
;
414 ies
= (u8
*)local
->hw_scan_req
+
415 sizeof(*local
->hw_scan_req
) +
416 req
->n_channels
* sizeof(req
->channels
[0]);
417 local
->hw_scan_req
->ie
= ies
;
419 local
->hw_scan_band
= 0;
422 * After allocating local->hw_scan_req, we must
423 * go through until ieee80211_prep_hw_scan(), so
424 * anything that might be changed here and leave
425 * this function early must not go after this
430 local
->scan_req
= req
;
431 local
->scan_sdata
= sdata
;
433 if (local
->ops
->hw_scan
)
434 __set_bit(SCAN_HW_SCANNING
, &local
->scanning
);
436 __set_bit(SCAN_SW_SCANNING
, &local
->scanning
);
438 ieee80211_recalc_idle(local
);
440 if (local
->ops
->hw_scan
) {
441 WARN_ON(!ieee80211_prep_hw_scan(local
));
442 rc
= drv_hw_scan(local
, sdata
, local
->hw_scan_req
);
444 rc
= ieee80211_start_sw_scan(local
);
447 kfree(local
->hw_scan_req
);
448 local
->hw_scan_req
= NULL
;
451 ieee80211_recalc_idle(local
);
453 local
->scan_req
= NULL
;
454 local
->scan_sdata
= NULL
;
461 ieee80211_scan_get_channel_time(struct ieee80211_channel
*chan
)
464 * TODO: channel switching also consumes quite some time,
465 * add that delay as well to get a better estimation
467 if (chan
->flags
& IEEE80211_CHAN_PASSIVE_SCAN
)
468 return IEEE80211_PASSIVE_CHANNEL_TIME
;
469 return IEEE80211_PROBE_DELAY
+ IEEE80211_CHANNEL_TIME
;
472 static void ieee80211_scan_state_decision(struct ieee80211_local
*local
,
473 unsigned long *next_delay
)
475 bool associated
= false;
476 bool tx_empty
= true;
478 bool listen_int_exceeded
;
479 unsigned long min_beacon_int
= 0;
480 struct ieee80211_sub_if_data
*sdata
;
481 struct ieee80211_channel
*next_chan
;
484 * check if at least one STA interface is associated,
485 * check if at least one STA interface has pending tx frames
486 * and grab the lowest used beacon interval
488 mutex_lock(&local
->iflist_mtx
);
489 list_for_each_entry(sdata
, &local
->interfaces
, list
) {
490 if (!ieee80211_sdata_running(sdata
))
493 if (sdata
->vif
.type
== NL80211_IFTYPE_STATION
) {
494 if (sdata
->u
.mgd
.associated
) {
497 if (sdata
->vif
.bss_conf
.beacon_int
<
498 min_beacon_int
|| min_beacon_int
== 0)
500 sdata
->vif
.bss_conf
.beacon_int
;
502 if (!qdisc_all_tx_empty(sdata
->dev
)) {
509 mutex_unlock(&local
->iflist_mtx
);
511 next_chan
= local
->scan_req
->channels
[local
->scan_channel_idx
];
513 if (ieee80211_cfg_on_oper_channel(local
)) {
514 /* We're currently on operating channel. */
515 if (next_chan
== local
->oper_channel
)
516 /* We don't need to move off of operating channel. */
517 local
->next_scan_state
= SCAN_SET_CHANNEL
;
520 * We do need to leave operating channel, as next
521 * scan is somewhere else.
523 local
->next_scan_state
= SCAN_LEAVE_OPER_CHANNEL
;
526 * we're currently scanning a different channel, let's
527 * see if we can scan another channel without interfering
528 * with the current traffic situation.
530 * Since we don't know if the AP has pending frames for us
531 * we can only check for our tx queues and use the current
532 * pm_qos requirements for rx. Hence, if no tx traffic occurs
533 * at all we will scan as many channels in a row as the pm_qos
534 * latency allows us to. Additionally we also check for the
535 * currently negotiated listen interval to prevent losing
536 * frames unnecessarily.
538 * Otherwise switch back to the operating channel.
541 bad_latency
= time_after(jiffies
+
542 ieee80211_scan_get_channel_time(next_chan
),
543 local
->leave_oper_channel_time
+
544 usecs_to_jiffies(pm_qos_request(PM_QOS_NETWORK_LATENCY
)));
546 listen_int_exceeded
= time_after(jiffies
+
547 ieee80211_scan_get_channel_time(next_chan
),
548 local
->leave_oper_channel_time
+
549 usecs_to_jiffies(min_beacon_int
* 1024) *
550 local
->hw
.conf
.listen_interval
);
552 if (associated
&& ( !tx_empty
|| bad_latency
||
553 listen_int_exceeded
))
554 local
->next_scan_state
= SCAN_ENTER_OPER_CHANNEL
;
556 local
->next_scan_state
= SCAN_SET_CHANNEL
;
562 static void ieee80211_scan_state_leave_oper_channel(struct ieee80211_local
*local
,
563 unsigned long *next_delay
)
565 /* PS will already be in off-channel mode,
566 * we do that once at the beginning of scanning.
568 ieee80211_offchannel_stop_vifs(local
, false);
571 * What if the nullfunc frames didn't arrive?
573 drv_flush(local
, false);
574 if (local
->ops
->flush
)
577 *next_delay
= HZ
/ 10;
579 /* remember when we left the operating channel */
580 local
->leave_oper_channel_time
= jiffies
;
582 /* advance to the next channel to be scanned */
583 local
->next_scan_state
= SCAN_SET_CHANNEL
;
586 static void ieee80211_scan_state_enter_oper_channel(struct ieee80211_local
*local
,
587 unsigned long *next_delay
)
589 /* switch back to the operating channel */
590 local
->scan_channel
= NULL
;
591 if (!ieee80211_cfg_on_oper_channel(local
))
592 ieee80211_hw_config(local
, IEEE80211_CONF_CHANGE_CHANNEL
);
595 * Re-enable vifs and beaconing. Leave PS
596 * in off-channel state..will put that back
597 * on-channel at the end of scanning.
599 ieee80211_offchannel_return(local
, true, false);
601 *next_delay
= HZ
/ 5;
602 local
->next_scan_state
= SCAN_DECISION
;
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 /* Only call hw-config if we really need to change channels. */
617 if (chan
!= local
->hw
.conf
.channel
)
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_send_probe(struct ieee80211_local
*local
,
653 unsigned long *next_delay
)
656 struct ieee80211_sub_if_data
*sdata
= local
->scan_sdata
;
657 enum ieee80211_band band
= local
->hw
.conf
.channel
->band
;
659 for (i
= 0; i
< local
->scan_req
->n_ssids
; i
++)
660 ieee80211_send_probe_req(
662 local
->scan_req
->ssids
[i
].ssid
,
663 local
->scan_req
->ssids
[i
].ssid_len
,
664 local
->scan_req
->ie
, local
->scan_req
->ie_len
,
665 local
->scan_req
->rates
[band
], false,
666 local
->scan_req
->no_cck
);
669 * After sending probe requests, wait for probe responses
672 *next_delay
= IEEE80211_CHANNEL_TIME
;
673 local
->next_scan_state
= SCAN_DECISION
;
676 void ieee80211_scan_work(struct work_struct
*work
)
678 struct ieee80211_local
*local
=
679 container_of(work
, struct ieee80211_local
, scan_work
.work
);
680 struct ieee80211_sub_if_data
*sdata
;
681 unsigned long next_delay
= 0;
682 bool aborted
, hw_scan
;
684 mutex_lock(&local
->mtx
);
686 sdata
= local
->scan_sdata
;
688 if (test_and_clear_bit(SCAN_COMPLETED
, &local
->scanning
)) {
689 aborted
= test_and_clear_bit(SCAN_ABORTED
, &local
->scanning
);
693 if (!sdata
|| !local
->scan_req
)
696 if (local
->scan_req
&& !local
->scanning
) {
697 struct cfg80211_scan_request
*req
= local
->scan_req
;
700 local
->scan_req
= NULL
;
701 local
->scan_sdata
= NULL
;
703 rc
= __ieee80211_start_scan(sdata
, req
);
705 /* need to complete scan in cfg80211 */
706 local
->scan_req
= req
;
714 * Avoid re-scheduling when the sdata is going away.
716 if (!ieee80211_sdata_running(sdata
)) {
722 * as long as no delay is required advance immediately
723 * without scheduling a new work
726 if (!ieee80211_sdata_running(sdata
)) {
731 switch (local
->next_scan_state
) {
733 /* if no more bands/channels left, complete scan */
734 if (local
->scan_channel_idx
>= local
->scan_req
->n_channels
) {
738 ieee80211_scan_state_decision(local
, &next_delay
);
740 case SCAN_SET_CHANNEL
:
741 ieee80211_scan_state_set_channel(local
, &next_delay
);
743 case SCAN_SEND_PROBE
:
744 ieee80211_scan_state_send_probe(local
, &next_delay
);
746 case SCAN_LEAVE_OPER_CHANNEL
:
747 ieee80211_scan_state_leave_oper_channel(local
, &next_delay
);
749 case SCAN_ENTER_OPER_CHANNEL
:
750 ieee80211_scan_state_enter_oper_channel(local
, &next_delay
);
753 } while (next_delay
== 0);
755 ieee80211_queue_delayed_work(&local
->hw
, &local
->scan_work
, next_delay
);
759 hw_scan
= test_bit(SCAN_HW_SCANNING
, &local
->scanning
);
760 __ieee80211_scan_completed(&local
->hw
, aborted
, hw_scan
);
762 mutex_unlock(&local
->mtx
);
765 int ieee80211_request_scan(struct ieee80211_sub_if_data
*sdata
,
766 struct cfg80211_scan_request
*req
)
770 mutex_lock(&sdata
->local
->mtx
);
771 res
= __ieee80211_start_scan(sdata
, req
);
772 mutex_unlock(&sdata
->local
->mtx
);
777 int ieee80211_request_internal_scan(struct ieee80211_sub_if_data
*sdata
,
778 const u8
*ssid
, u8 ssid_len
,
779 struct ieee80211_channel
*chan
)
781 struct ieee80211_local
*local
= sdata
->local
;
783 enum ieee80211_band band
;
785 mutex_lock(&local
->mtx
);
791 /* fill internal scan request */
795 for (band
= 0; band
< IEEE80211_NUM_BANDS
; band
++) {
796 if (!local
->hw
.wiphy
->bands
[band
])
799 i
< local
->hw
.wiphy
->bands
[band
]->n_channels
;
801 local
->int_scan_req
->channels
[nchan
] =
802 &local
->hw
.wiphy
->bands
[band
]->channels
[i
];
807 local
->int_scan_req
->n_channels
= nchan
;
809 local
->int_scan_req
->channels
[0] = chan
;
810 local
->int_scan_req
->n_channels
= 1;
813 local
->int_scan_req
->ssids
= &local
->scan_ssid
;
814 local
->int_scan_req
->n_ssids
= 1;
815 memcpy(local
->int_scan_req
->ssids
[0].ssid
, ssid
, IEEE80211_MAX_SSID_LEN
);
816 local
->int_scan_req
->ssids
[0].ssid_len
= ssid_len
;
818 ret
= __ieee80211_start_scan(sdata
, sdata
->local
->int_scan_req
);
820 mutex_unlock(&local
->mtx
);
825 * Only call this function when a scan can't be queued -- under RTNL.
827 void ieee80211_scan_cancel(struct ieee80211_local
*local
)
830 * We are canceling software scan, or deferred scan that was not
831 * yet really started (see __ieee80211_start_scan ).
833 * Regarding hardware scan:
834 * - we can not call __ieee80211_scan_completed() as when
835 * SCAN_HW_SCANNING bit is set this function change
836 * local->hw_scan_req to operate on 5G band, what race with
837 * driver which can use local->hw_scan_req
839 * - we can not cancel scan_work since driver can schedule it
840 * by ieee80211_scan_completed(..., true) to finish scan
842 * Hence we only call the cancel_hw_scan() callback, but the low-level
843 * driver is still responsible for calling ieee80211_scan_completed()
844 * after the scan was completed/aborted.
847 mutex_lock(&local
->mtx
);
848 if (!local
->scan_req
)
851 if (test_bit(SCAN_HW_SCANNING
, &local
->scanning
)) {
852 if (local
->ops
->cancel_hw_scan
)
853 drv_cancel_hw_scan(local
, local
->scan_sdata
);
858 * If the work is currently running, it must be blocked on
859 * the mutex, but we'll set scan_sdata = NULL and it'll
860 * simply exit once it acquires the mutex.
862 cancel_delayed_work(&local
->scan_work
);
864 __ieee80211_scan_completed(&local
->hw
, true, false);
866 mutex_unlock(&local
->mtx
);
869 int ieee80211_request_sched_scan_start(struct ieee80211_sub_if_data
*sdata
,
870 struct cfg80211_sched_scan_request
*req
)
872 struct ieee80211_local
*local
= sdata
->local
;
875 mutex_lock(&sdata
->local
->mtx
);
877 if (local
->sched_scanning
) {
882 if (!local
->ops
->sched_scan_start
) {
887 for (i
= 0; i
< IEEE80211_NUM_BANDS
; i
++) {
888 local
->sched_scan_ies
.ie
[i
] = kzalloc(2 +
889 IEEE80211_MAX_SSID_LEN
+
890 local
->scan_ies_len
+
893 if (!local
->sched_scan_ies
.ie
[i
]) {
898 local
->sched_scan_ies
.len
[i
] =
899 ieee80211_build_preq_ies(local
,
900 local
->sched_scan_ies
.ie
[i
],
901 req
->ie
, req
->ie_len
, i
,
905 ret
= drv_sched_scan_start(local
, sdata
, req
,
906 &local
->sched_scan_ies
);
908 local
->sched_scanning
= true;
914 kfree(local
->sched_scan_ies
.ie
[--i
]);
916 mutex_unlock(&sdata
->local
->mtx
);
920 int ieee80211_request_sched_scan_stop(struct ieee80211_sub_if_data
*sdata
)
922 struct ieee80211_local
*local
= sdata
->local
;
925 mutex_lock(&sdata
->local
->mtx
);
927 if (!local
->ops
->sched_scan_stop
) {
932 if (local
->sched_scanning
) {
933 for (i
= 0; i
< IEEE80211_NUM_BANDS
; i
++)
934 kfree(local
->sched_scan_ies
.ie
[i
]);
936 drv_sched_scan_stop(local
, sdata
);
937 local
->sched_scanning
= false;
940 mutex_unlock(&sdata
->local
->mtx
);
945 void ieee80211_sched_scan_results(struct ieee80211_hw
*hw
)
947 struct ieee80211_local
*local
= hw_to_local(hw
);
949 trace_api_sched_scan_results(local
);
951 cfg80211_sched_scan_results(hw
->wiphy
);
953 EXPORT_SYMBOL(ieee80211_sched_scan_results
);
955 void ieee80211_sched_scan_stopped_work(struct work_struct
*work
)
957 struct ieee80211_local
*local
=
958 container_of(work
, struct ieee80211_local
,
959 sched_scan_stopped_work
);
962 mutex_lock(&local
->mtx
);
964 if (!local
->sched_scanning
) {
965 mutex_unlock(&local
->mtx
);
969 for (i
= 0; i
< IEEE80211_NUM_BANDS
; i
++)
970 kfree(local
->sched_scan_ies
.ie
[i
]);
972 local
->sched_scanning
= false;
974 mutex_unlock(&local
->mtx
);
976 cfg80211_sched_scan_stopped(local
->hw
.wiphy
);
979 void ieee80211_sched_scan_stopped(struct ieee80211_hw
*hw
)
981 struct ieee80211_local
*local
= hw_to_local(hw
);
983 trace_api_sched_scan_stopped(local
);
985 ieee80211_queue_work(&local
->hw
, &local
->sched_scan_stopped_work
);
987 EXPORT_SYMBOL(ieee80211_sched_scan_stopped
);