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_params.h>
18 #include <linux/slab.h>
19 #include <net/sch_generic.h>
20 #include <linux/slab.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
, (u32
) -1,
257 local
->hw_scan_req
->ie_len
= ielen
;
262 static void __ieee80211_scan_completed(struct ieee80211_hw
*hw
, bool aborted
,
265 struct ieee80211_local
*local
= hw_to_local(hw
);
267 bool enable_beacons
= false;
269 lockdep_assert_held(&local
->mtx
);
272 * It's ok to abort a not-yet-running scan (that
273 * we have one at all will be verified by checking
274 * local->scan_req next), but not to complete it
277 if (WARN_ON(!local
->scanning
&& !aborted
))
280 if (WARN_ON(!local
->scan_req
))
283 if (was_hw_scan
&& !aborted
&& ieee80211_prep_hw_scan(local
)) {
284 int rc
= drv_hw_scan(local
, local
->scan_sdata
, local
->hw_scan_req
);
289 kfree(local
->hw_scan_req
);
290 local
->hw_scan_req
= NULL
;
292 if (local
->scan_req
!= local
->int_scan_req
)
293 cfg80211_scan_done(local
->scan_req
, aborted
);
294 local
->scan_req
= NULL
;
295 local
->scan_sdata
= NULL
;
298 local
->scan_channel
= NULL
;
300 on_oper_chan
= ieee80211_cfg_on_oper_channel(local
);
302 if (was_hw_scan
|| !on_oper_chan
)
303 ieee80211_hw_config(local
, IEEE80211_CONF_CHANGE_CHANNEL
);
305 /* Set power back to normal operating levels. */
306 ieee80211_hw_config(local
, 0);
310 ieee80211_configure_filter(local
);
311 drv_sw_scan_complete(local
);
312 on_oper_chan2
= ieee80211_cfg_on_oper_channel(local
);
313 /* We should always be on-channel at this point. */
314 WARN_ON(!on_oper_chan2
);
315 if (on_oper_chan2
&& (on_oper_chan
!= on_oper_chan2
))
316 enable_beacons
= true;
318 ieee80211_offchannel_return(local
, enable_beacons
, true);
321 ieee80211_recalc_idle(local
);
323 ieee80211_mlme_notify_scan_completed(local
);
324 ieee80211_ibss_notify_scan_completed(local
);
325 ieee80211_mesh_notify_scan_completed(local
);
326 ieee80211_queue_work(&local
->hw
, &local
->work_work
);
329 void ieee80211_scan_completed(struct ieee80211_hw
*hw
, bool aborted
)
331 struct ieee80211_local
*local
= hw_to_local(hw
);
333 trace_api_scan_completed(local
, aborted
);
335 set_bit(SCAN_COMPLETED
, &local
->scanning
);
337 set_bit(SCAN_ABORTED
, &local
->scanning
);
338 ieee80211_queue_delayed_work(&local
->hw
, &local
->scan_work
, 0);
340 EXPORT_SYMBOL(ieee80211_scan_completed
);
342 static int ieee80211_start_sw_scan(struct ieee80211_local
*local
)
345 * Hardware/driver doesn't support hw_scan, so use software
346 * scanning instead. First send a nullfunc frame with power save
347 * bit on so that AP will buffer the frames for us while we are not
348 * listening, then send probe requests to each channel and wait for
349 * the responses. After all channels are scanned, tune back to the
350 * original channel and send a nullfunc frame with power save bit
351 * off to trigger the AP to send us all the buffered frames.
353 * Note that while local->sw_scanning is true everything else but
354 * nullfunc frames and probe requests will be dropped in
355 * ieee80211_tx_h_check_assoc().
357 drv_sw_scan_start(local
);
359 local
->leave_oper_channel_time
= 0;
360 local
->next_scan_state
= SCAN_DECISION
;
361 local
->scan_channel_idx
= 0;
363 /* We always want to use off-channel PS, even if we
364 * are not really leaving oper-channel. Don't
365 * tell the AP though, as long as we are on-channel.
367 ieee80211_offchannel_enable_all_ps(local
, false);
369 ieee80211_configure_filter(local
);
371 /* We need to set power level at maximum rate for scanning. */
372 ieee80211_hw_config(local
, 0);
374 ieee80211_queue_delayed_work(&local
->hw
,
376 IEEE80211_CHANNEL_TIME
);
382 static int __ieee80211_start_scan(struct ieee80211_sub_if_data
*sdata
,
383 struct cfg80211_scan_request
*req
)
385 struct ieee80211_local
*local
= sdata
->local
;
388 lockdep_assert_held(&local
->mtx
);
393 if (!list_empty(&local
->work_list
)) {
394 /* wait for the work to finish/time out */
395 local
->scan_req
= req
;
396 local
->scan_sdata
= sdata
;
400 if (local
->ops
->hw_scan
) {
403 local
->hw_scan_req
= kmalloc(
404 sizeof(*local
->hw_scan_req
) +
405 req
->n_channels
* sizeof(req
->channels
[0]) +
406 2 + IEEE80211_MAX_SSID_LEN
+ local
->scan_ies_len
+
407 req
->ie_len
, GFP_KERNEL
);
408 if (!local
->hw_scan_req
)
411 local
->hw_scan_req
->ssids
= req
->ssids
;
412 local
->hw_scan_req
->n_ssids
= req
->n_ssids
;
413 ies
= (u8
*)local
->hw_scan_req
+
414 sizeof(*local
->hw_scan_req
) +
415 req
->n_channels
* sizeof(req
->channels
[0]);
416 local
->hw_scan_req
->ie
= ies
;
418 local
->hw_scan_band
= 0;
421 * After allocating local->hw_scan_req, we must
422 * go through until ieee80211_prep_hw_scan(), so
423 * anything that might be changed here and leave
424 * this function early must not go after this
429 local
->scan_req
= req
;
430 local
->scan_sdata
= sdata
;
432 if (local
->ops
->hw_scan
)
433 __set_bit(SCAN_HW_SCANNING
, &local
->scanning
);
435 __set_bit(SCAN_SW_SCANNING
, &local
->scanning
);
437 ieee80211_recalc_idle(local
);
439 if (local
->ops
->hw_scan
) {
440 WARN_ON(!ieee80211_prep_hw_scan(local
));
441 rc
= drv_hw_scan(local
, sdata
, local
->hw_scan_req
);
443 rc
= ieee80211_start_sw_scan(local
);
446 kfree(local
->hw_scan_req
);
447 local
->hw_scan_req
= NULL
;
450 ieee80211_recalc_idle(local
);
452 local
->scan_req
= NULL
;
453 local
->scan_sdata
= NULL
;
460 ieee80211_scan_get_channel_time(struct ieee80211_channel
*chan
)
463 * TODO: channel switching also consumes quite some time,
464 * add that delay as well to get a better estimation
466 if (chan
->flags
& IEEE80211_CHAN_PASSIVE_SCAN
)
467 return IEEE80211_PASSIVE_CHANNEL_TIME
;
468 return IEEE80211_PROBE_DELAY
+ IEEE80211_CHANNEL_TIME
;
471 static void ieee80211_scan_state_decision(struct ieee80211_local
*local
,
472 unsigned long *next_delay
)
474 bool associated
= false;
475 bool tx_empty
= true;
477 bool listen_int_exceeded
;
478 unsigned long min_beacon_int
= 0;
479 struct ieee80211_sub_if_data
*sdata
;
480 struct ieee80211_channel
*next_chan
;
483 * check if at least one STA interface is associated,
484 * check if at least one STA interface has pending tx frames
485 * and grab the lowest used beacon interval
487 mutex_lock(&local
->iflist_mtx
);
488 list_for_each_entry(sdata
, &local
->interfaces
, list
) {
489 if (!ieee80211_sdata_running(sdata
))
492 if (sdata
->vif
.type
== NL80211_IFTYPE_STATION
) {
493 if (sdata
->u
.mgd
.associated
) {
496 if (sdata
->vif
.bss_conf
.beacon_int
<
497 min_beacon_int
|| min_beacon_int
== 0)
499 sdata
->vif
.bss_conf
.beacon_int
;
501 if (!qdisc_all_tx_empty(sdata
->dev
)) {
508 mutex_unlock(&local
->iflist_mtx
);
510 next_chan
= local
->scan_req
->channels
[local
->scan_channel_idx
];
512 if (ieee80211_cfg_on_oper_channel(local
)) {
513 /* We're currently on operating channel. */
514 if (next_chan
== local
->oper_channel
)
515 /* We don't need to move off of operating channel. */
516 local
->next_scan_state
= SCAN_SET_CHANNEL
;
519 * We do need to leave operating channel, as next
520 * scan is somewhere else.
522 local
->next_scan_state
= SCAN_LEAVE_OPER_CHANNEL
;
525 * we're currently scanning a different channel, let's
526 * see if we can scan another channel without interfering
527 * with the current traffic situation.
529 * Since we don't know if the AP has pending frames for us
530 * we can only check for our tx queues and use the current
531 * pm_qos requirements for rx. Hence, if no tx traffic occurs
532 * at all we will scan as many channels in a row as the pm_qos
533 * latency allows us to. Additionally we also check for the
534 * currently negotiated listen interval to prevent losing
535 * frames unnecessarily.
537 * Otherwise switch back to the operating channel.
540 bad_latency
= time_after(jiffies
+
541 ieee80211_scan_get_channel_time(next_chan
),
542 local
->leave_oper_channel_time
+
543 usecs_to_jiffies(pm_qos_request(PM_QOS_NETWORK_LATENCY
)));
545 listen_int_exceeded
= time_after(jiffies
+
546 ieee80211_scan_get_channel_time(next_chan
),
547 local
->leave_oper_channel_time
+
548 usecs_to_jiffies(min_beacon_int
* 1024) *
549 local
->hw
.conf
.listen_interval
);
551 if (associated
&& ( !tx_empty
|| bad_latency
||
552 listen_int_exceeded
))
553 local
->next_scan_state
= SCAN_ENTER_OPER_CHANNEL
;
555 local
->next_scan_state
= SCAN_SET_CHANNEL
;
561 static void ieee80211_scan_state_leave_oper_channel(struct ieee80211_local
*local
,
562 unsigned long *next_delay
)
564 /* PS will already be in off-channel mode,
565 * we do that once at the beginning of scanning.
567 ieee80211_offchannel_stop_vifs(local
, false);
570 * What if the nullfunc frames didn't arrive?
572 drv_flush(local
, false);
573 if (local
->ops
->flush
)
576 *next_delay
= HZ
/ 10;
578 /* remember when we left the operating channel */
579 local
->leave_oper_channel_time
= jiffies
;
581 /* advance to the next channel to be scanned */
582 local
->next_scan_state
= SCAN_SET_CHANNEL
;
585 static void ieee80211_scan_state_enter_oper_channel(struct ieee80211_local
*local
,
586 unsigned long *next_delay
)
588 /* switch back to the operating channel */
589 local
->scan_channel
= NULL
;
590 if (!ieee80211_cfg_on_oper_channel(local
))
591 ieee80211_hw_config(local
, IEEE80211_CONF_CHANGE_CHANNEL
);
594 * Re-enable vifs and beaconing. Leave PS
595 * in off-channel state..will put that back
596 * on-channel at the end of scanning.
598 ieee80211_offchannel_return(local
, true, false);
600 *next_delay
= HZ
/ 5;
601 local
->next_scan_state
= SCAN_DECISION
;
604 static void ieee80211_scan_state_set_channel(struct ieee80211_local
*local
,
605 unsigned long *next_delay
)
608 struct ieee80211_channel
*chan
;
611 chan
= local
->scan_req
->channels
[local
->scan_channel_idx
];
613 local
->scan_channel
= chan
;
615 /* Only call hw-config if we really need to change channels. */
616 if (chan
!= local
->hw
.conf
.channel
)
617 if (ieee80211_hw_config(local
, IEEE80211_CONF_CHANGE_CHANNEL
))
620 /* advance state machine to next channel/band */
621 local
->scan_channel_idx
++;
624 /* if we skip this channel return to the decision state */
625 local
->next_scan_state
= SCAN_DECISION
;
630 * Probe delay is used to update the NAV, cf. 11.1.3.2.2
631 * (which unfortunately doesn't say _why_ step a) is done,
632 * but it waits for the probe delay or until a frame is
633 * received - and the received frame would update the NAV).
634 * For now, we do not support waiting until a frame is
637 * In any case, it is not necessary for a passive scan.
639 if (chan
->flags
& IEEE80211_CHAN_PASSIVE_SCAN
||
640 !local
->scan_req
->n_ssids
) {
641 *next_delay
= IEEE80211_PASSIVE_CHANNEL_TIME
;
642 local
->next_scan_state
= SCAN_DECISION
;
646 /* active scan, send probes */
647 *next_delay
= IEEE80211_PROBE_DELAY
;
648 local
->next_scan_state
= SCAN_SEND_PROBE
;
651 static void ieee80211_scan_state_send_probe(struct ieee80211_local
*local
,
652 unsigned long *next_delay
)
655 struct ieee80211_sub_if_data
*sdata
= local
->scan_sdata
;
657 for (i
= 0; i
< local
->scan_req
->n_ssids
; i
++)
658 ieee80211_send_probe_req(
660 local
->scan_req
->ssids
[i
].ssid
,
661 local
->scan_req
->ssids
[i
].ssid_len
,
662 local
->scan_req
->ie
, local
->scan_req
->ie_len
);
665 * After sending probe requests, wait for probe responses
668 *next_delay
= IEEE80211_CHANNEL_TIME
;
669 local
->next_scan_state
= SCAN_DECISION
;
672 void ieee80211_scan_work(struct work_struct
*work
)
674 struct ieee80211_local
*local
=
675 container_of(work
, struct ieee80211_local
, scan_work
.work
);
676 struct ieee80211_sub_if_data
*sdata
;
677 unsigned long next_delay
= 0;
678 bool aborted
, hw_scan
;
680 mutex_lock(&local
->mtx
);
682 sdata
= local
->scan_sdata
;
684 if (test_and_clear_bit(SCAN_COMPLETED
, &local
->scanning
)) {
685 aborted
= test_and_clear_bit(SCAN_ABORTED
, &local
->scanning
);
689 if (!sdata
|| !local
->scan_req
)
692 if (local
->scan_req
&& !local
->scanning
) {
693 struct cfg80211_scan_request
*req
= local
->scan_req
;
696 local
->scan_req
= NULL
;
697 local
->scan_sdata
= NULL
;
699 rc
= __ieee80211_start_scan(sdata
, req
);
701 /* need to complete scan in cfg80211 */
702 local
->scan_req
= req
;
710 * Avoid re-scheduling when the sdata is going away.
712 if (!ieee80211_sdata_running(sdata
)) {
718 * as long as no delay is required advance immediately
719 * without scheduling a new work
722 if (!ieee80211_sdata_running(sdata
)) {
727 switch (local
->next_scan_state
) {
729 /* if no more bands/channels left, complete scan */
730 if (local
->scan_channel_idx
>= local
->scan_req
->n_channels
) {
734 ieee80211_scan_state_decision(local
, &next_delay
);
736 case SCAN_SET_CHANNEL
:
737 ieee80211_scan_state_set_channel(local
, &next_delay
);
739 case SCAN_SEND_PROBE
:
740 ieee80211_scan_state_send_probe(local
, &next_delay
);
742 case SCAN_LEAVE_OPER_CHANNEL
:
743 ieee80211_scan_state_leave_oper_channel(local
, &next_delay
);
745 case SCAN_ENTER_OPER_CHANNEL
:
746 ieee80211_scan_state_enter_oper_channel(local
, &next_delay
);
749 } while (next_delay
== 0);
751 ieee80211_queue_delayed_work(&local
->hw
, &local
->scan_work
, next_delay
);
755 hw_scan
= test_bit(SCAN_HW_SCANNING
, &local
->scanning
);
756 __ieee80211_scan_completed(&local
->hw
, aborted
, hw_scan
);
758 mutex_unlock(&local
->mtx
);
761 int ieee80211_request_scan(struct ieee80211_sub_if_data
*sdata
,
762 struct cfg80211_scan_request
*req
)
766 mutex_lock(&sdata
->local
->mtx
);
767 res
= __ieee80211_start_scan(sdata
, req
);
768 mutex_unlock(&sdata
->local
->mtx
);
773 int ieee80211_request_internal_scan(struct ieee80211_sub_if_data
*sdata
,
774 const u8
*ssid
, u8 ssid_len
,
775 struct ieee80211_channel
*chan
)
777 struct ieee80211_local
*local
= sdata
->local
;
779 enum ieee80211_band band
;
781 mutex_lock(&local
->mtx
);
787 /* fill internal scan request */
791 for (band
= 0; band
< IEEE80211_NUM_BANDS
; band
++) {
792 if (!local
->hw
.wiphy
->bands
[band
])
795 i
< local
->hw
.wiphy
->bands
[band
]->n_channels
;
797 local
->int_scan_req
->channels
[nchan
] =
798 &local
->hw
.wiphy
->bands
[band
]->channels
[i
];
803 local
->int_scan_req
->n_channels
= nchan
;
805 local
->int_scan_req
->channels
[0] = chan
;
806 local
->int_scan_req
->n_channels
= 1;
809 local
->int_scan_req
->ssids
= &local
->scan_ssid
;
810 local
->int_scan_req
->n_ssids
= 1;
811 memcpy(local
->int_scan_req
->ssids
[0].ssid
, ssid
, IEEE80211_MAX_SSID_LEN
);
812 local
->int_scan_req
->ssids
[0].ssid_len
= ssid_len
;
814 ret
= __ieee80211_start_scan(sdata
, sdata
->local
->int_scan_req
);
816 mutex_unlock(&local
->mtx
);
821 * Only call this function when a scan can't be queued -- under RTNL.
823 void ieee80211_scan_cancel(struct ieee80211_local
*local
)
828 * We are only canceling software scan, or deferred scan that was not
829 * yet really started (see __ieee80211_start_scan ).
831 * Regarding hardware scan:
832 * - we can not call __ieee80211_scan_completed() as when
833 * SCAN_HW_SCANNING bit is set this function change
834 * local->hw_scan_req to operate on 5G band, what race with
835 * driver which can use local->hw_scan_req
837 * - we can not cancel scan_work since driver can schedule it
838 * by ieee80211_scan_completed(..., true) to finish scan
840 * Hence low lever driver is responsible for canceling HW scan.
843 mutex_lock(&local
->mtx
);
844 abortscan
= local
->scan_req
&& !test_bit(SCAN_HW_SCANNING
, &local
->scanning
);
847 * The scan is canceled, but stop work from being pending.
849 * If the work is currently running, it must be blocked on
850 * the mutex, but we'll set scan_sdata = NULL and it'll
851 * simply exit once it acquires the mutex.
853 cancel_delayed_work(&local
->scan_work
);
855 __ieee80211_scan_completed(&local
->hw
, true, false);
857 mutex_unlock(&local
->mtx
);
860 int ieee80211_request_sched_scan_start(struct ieee80211_sub_if_data
*sdata
,
861 struct cfg80211_sched_scan_request
*req
)
863 struct ieee80211_local
*local
= sdata
->local
;
866 mutex_lock(&sdata
->local
->mtx
);
868 if (local
->sched_scanning
) {
873 if (!local
->ops
->sched_scan_start
) {
878 for (i
= 0; i
< IEEE80211_NUM_BANDS
; i
++) {
879 local
->sched_scan_ies
.ie
[i
] = kzalloc(2 +
880 IEEE80211_MAX_SSID_LEN
+
883 if (!local
->sched_scan_ies
.ie
[i
]) {
888 local
->sched_scan_ies
.len
[i
] =
889 ieee80211_build_preq_ies(local
,
890 local
->sched_scan_ies
.ie
[i
],
891 req
->ie
, req
->ie_len
, i
,
895 ret
= drv_sched_scan_start(local
, sdata
, req
,
896 &local
->sched_scan_ies
);
898 local
->sched_scanning
= true;
904 kfree(local
->sched_scan_ies
.ie
[--i
]);
906 mutex_unlock(&sdata
->local
->mtx
);
910 int ieee80211_request_sched_scan_stop(struct ieee80211_sub_if_data
*sdata
)
912 struct ieee80211_local
*local
= sdata
->local
;
915 mutex_lock(&sdata
->local
->mtx
);
917 if (!local
->ops
->sched_scan_stop
) {
922 if (local
->sched_scanning
) {
923 for (i
= 0; i
< IEEE80211_NUM_BANDS
; i
++)
924 kfree(local
->sched_scan_ies
.ie
[i
]);
926 drv_sched_scan_stop(local
, sdata
);
927 local
->sched_scanning
= false;
930 mutex_unlock(&sdata
->local
->mtx
);
935 void ieee80211_sched_scan_results(struct ieee80211_hw
*hw
)
937 struct ieee80211_local
*local
= hw_to_local(hw
);
939 trace_api_sched_scan_results(local
);
941 cfg80211_sched_scan_results(hw
->wiphy
);
943 EXPORT_SYMBOL(ieee80211_sched_scan_results
);
945 void ieee80211_sched_scan_stopped_work(struct work_struct
*work
)
947 struct ieee80211_local
*local
=
948 container_of(work
, struct ieee80211_local
,
949 sched_scan_stopped_work
);
952 mutex_lock(&local
->mtx
);
954 if (!local
->sched_scanning
) {
955 mutex_unlock(&local
->mtx
);
959 for (i
= 0; i
< IEEE80211_NUM_BANDS
; i
++)
960 kfree(local
->sched_scan_ies
.ie
[i
]);
962 local
->sched_scanning
= false;
964 mutex_unlock(&local
->mtx
);
966 cfg80211_sched_scan_stopped(local
->hw
.wiphy
);
969 void ieee80211_sched_scan_stopped(struct ieee80211_hw
*hw
)
971 struct ieee80211_local
*local
= hw_to_local(hw
);
973 trace_api_sched_scan_stopped(local
);
975 ieee80211_queue_work(&local
->hw
, &local
->sched_scan_stopped_work
);
977 EXPORT_SYMBOL(ieee80211_sched_scan_stopped
);