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 / 8)
32 struct ieee80211_bss
*
33 ieee80211_rx_bss_get(struct ieee80211_local
*local
, u8
*bssid
, int freq
,
34 u8
*ssid
, u8 ssid_len
)
36 struct cfg80211_bss
*cbss
;
38 cbss
= cfg80211_get_bss(local
->hw
.wiphy
,
39 ieee80211_get_channel(local
->hw
.wiphy
, freq
),
40 bssid
, ssid
, ssid_len
, 0, 0);
43 return (void *)cbss
->priv
;
46 static void ieee80211_rx_bss_free(struct cfg80211_bss
*cbss
)
48 struct ieee80211_bss
*bss
= (void *)cbss
->priv
;
50 kfree(bss_mesh_id(bss
));
51 kfree(bss_mesh_cfg(bss
));
54 void ieee80211_rx_bss_put(struct ieee80211_local
*local
,
55 struct ieee80211_bss
*bss
)
59 cfg80211_put_bss(container_of((void *)bss
, struct cfg80211_bss
, priv
));
62 static bool is_uapsd_supported(struct ieee802_11_elems
*elems
)
66 if (elems
->wmm_info
&& elems
->wmm_info_len
== 7
67 && elems
->wmm_info
[5] == 1)
68 qos_info
= elems
->wmm_info
[6];
69 else if (elems
->wmm_param
&& elems
->wmm_param_len
== 24
70 && elems
->wmm_param
[5] == 1)
71 qos_info
= elems
->wmm_param
[6];
73 /* no valid wmm information or parameter element found */
76 return qos_info
& IEEE80211_WMM_IE_AP_QOSINFO_UAPSD
;
79 struct ieee80211_bss
*
80 ieee80211_bss_info_update(struct ieee80211_local
*local
,
81 struct ieee80211_rx_status
*rx_status
,
82 struct ieee80211_mgmt
*mgmt
,
84 struct ieee802_11_elems
*elems
,
85 struct ieee80211_channel
*channel
,
88 struct cfg80211_bss
*cbss
;
89 struct ieee80211_bss
*bss
;
93 if (local
->hw
.flags
& IEEE80211_HW_SIGNAL_DBM
)
94 signal
= rx_status
->signal
* 100;
95 else if (local
->hw
.flags
& IEEE80211_HW_SIGNAL_UNSPEC
)
96 signal
= (rx_status
->signal
* 100) / local
->hw
.max_signal
;
98 cbss
= cfg80211_inform_bss_frame(local
->hw
.wiphy
, channel
,
99 mgmt
, len
, signal
, GFP_ATOMIC
);
104 cbss
->free_priv
= ieee80211_rx_bss_free
;
105 bss
= (void *)cbss
->priv
;
107 if (elems
->parse_error
) {
109 bss
->corrupt_data
|= IEEE80211_BSS_CORRUPT_BEACON
;
111 bss
->corrupt_data
|= IEEE80211_BSS_CORRUPT_PROBE_RESP
;
114 bss
->corrupt_data
&= ~IEEE80211_BSS_CORRUPT_BEACON
;
116 bss
->corrupt_data
&= ~IEEE80211_BSS_CORRUPT_PROBE_RESP
;
119 /* save the ERP value so that it is available at association time */
120 if (elems
->erp_info
&& elems
->erp_info_len
>= 1 &&
121 (!elems
->parse_error
||
122 !(bss
->valid_data
& IEEE80211_BSS_VALID_ERP
))) {
123 bss
->erp_value
= elems
->erp_info
[0];
124 bss
->has_erp_value
= true;
125 if (!elems
->parse_error
)
126 bss
->valid_data
|= IEEE80211_BSS_VALID_ERP
;
129 if (elems
->tim
&& (!elems
->parse_error
||
130 !(bss
->valid_data
& IEEE80211_BSS_VALID_DTIM
))) {
131 struct ieee80211_tim_ie
*tim_ie
=
132 (struct ieee80211_tim_ie
*)elems
->tim
;
133 bss
->dtim_period
= tim_ie
->dtim_period
;
134 if (!elems
->parse_error
)
135 bss
->valid_data
|= IEEE80211_BSS_VALID_DTIM
;
138 /* If the beacon had no TIM IE, or it was invalid, use 1 */
139 if (beacon
&& !bss
->dtim_period
)
140 bss
->dtim_period
= 1;
142 /* replace old supported rates if we get new values */
143 if (!elems
->parse_error
||
144 !(bss
->valid_data
& IEEE80211_BSS_VALID_RATES
)) {
146 if (elems
->supp_rates
) {
147 clen
= IEEE80211_MAX_SUPP_RATES
;
148 if (clen
> elems
->supp_rates_len
)
149 clen
= elems
->supp_rates_len
;
150 memcpy(bss
->supp_rates
, elems
->supp_rates
, clen
);
153 if (elems
->ext_supp_rates
) {
154 clen
= IEEE80211_MAX_SUPP_RATES
- srlen
;
155 if (clen
> elems
->ext_supp_rates_len
)
156 clen
= elems
->ext_supp_rates_len
;
157 memcpy(bss
->supp_rates
+ srlen
, elems
->ext_supp_rates
,
162 bss
->supp_rates_len
= srlen
;
163 if (!elems
->parse_error
)
164 bss
->valid_data
|= IEEE80211_BSS_VALID_RATES
;
168 if (!elems
->parse_error
||
169 !(bss
->valid_data
& IEEE80211_BSS_VALID_WMM
)) {
170 bss
->wmm_used
= elems
->wmm_param
|| elems
->wmm_info
;
171 bss
->uapsd_supported
= is_uapsd_supported(elems
);
172 if (!elems
->parse_error
)
173 bss
->valid_data
|= IEEE80211_BSS_VALID_WMM
;
177 bss
->last_probe_resp
= jiffies
;
183 ieee80211_scan_rx(struct ieee80211_sub_if_data
*sdata
, struct sk_buff
*skb
)
185 struct ieee80211_rx_status
*rx_status
= IEEE80211_SKB_RXCB(skb
);
186 struct ieee80211_mgmt
*mgmt
;
187 struct ieee80211_bss
*bss
;
189 struct ieee80211_channel
*channel
;
193 bool presp
, beacon
= false;
194 struct ieee802_11_elems elems
;
197 return RX_DROP_UNUSABLE
;
199 mgmt
= (struct ieee80211_mgmt
*) skb
->data
;
200 fc
= mgmt
->frame_control
;
202 if (ieee80211_is_ctl(fc
))
208 presp
= ieee80211_is_probe_resp(fc
);
210 /* ignore ProbeResp to foreign address */
211 if (compare_ether_addr(mgmt
->da
, sdata
->vif
.addr
))
212 return RX_DROP_MONITOR
;
215 elements
= mgmt
->u
.probe_resp
.variable
;
216 baselen
= offsetof(struct ieee80211_mgmt
, u
.probe_resp
.variable
);
218 beacon
= ieee80211_is_beacon(fc
);
219 baselen
= offsetof(struct ieee80211_mgmt
, u
.beacon
.variable
);
220 elements
= mgmt
->u
.beacon
.variable
;
223 if (!presp
&& !beacon
)
226 if (baselen
> skb
->len
)
227 return RX_DROP_MONITOR
;
229 ieee802_11_parse_elems(elements
, skb
->len
- baselen
, &elems
);
231 if (elems
.ds_params
&& elems
.ds_params_len
== 1)
232 freq
= ieee80211_channel_to_frequency(elems
.ds_params
[0],
235 freq
= rx_status
->freq
;
237 channel
= ieee80211_get_channel(sdata
->local
->hw
.wiphy
, freq
);
239 if (!channel
|| channel
->flags
& IEEE80211_CHAN_DISABLED
)
240 return RX_DROP_MONITOR
;
242 bss
= ieee80211_bss_info_update(sdata
->local
, rx_status
,
243 mgmt
, skb
->len
, &elems
,
246 ieee80211_rx_bss_put(sdata
->local
, bss
);
248 if (channel
== sdata
->local
->oper_channel
)
255 /* return false if no more work */
256 static bool ieee80211_prep_hw_scan(struct ieee80211_local
*local
)
258 struct cfg80211_scan_request
*req
= local
->scan_req
;
259 enum ieee80211_band band
;
260 int i
, ielen
, n_chans
;
263 if (local
->hw_scan_band
== IEEE80211_NUM_BANDS
)
266 band
= local
->hw_scan_band
;
268 for (i
= 0; i
< req
->n_channels
; i
++) {
269 if (req
->channels
[i
]->band
== band
) {
270 local
->hw_scan_req
->channels
[n_chans
] =
276 local
->hw_scan_band
++;
279 local
->hw_scan_req
->n_channels
= n_chans
;
281 ielen
= ieee80211_build_preq_ies(local
, (u8
*)local
->hw_scan_req
->ie
,
282 req
->ie
, req
->ie_len
, band
,
283 req
->rates
[band
], 0);
284 local
->hw_scan_req
->ie_len
= ielen
;
285 local
->hw_scan_req
->no_cck
= req
->no_cck
;
290 static void __ieee80211_scan_completed(struct ieee80211_hw
*hw
, bool aborted
,
293 struct ieee80211_local
*local
= hw_to_local(hw
);
295 lockdep_assert_held(&local
->mtx
);
298 * It's ok to abort a not-yet-running scan (that
299 * we have one at all will be verified by checking
300 * local->scan_req next), but not to complete it
303 if (WARN_ON(!local
->scanning
&& !aborted
))
306 if (WARN_ON(!local
->scan_req
))
309 if (was_hw_scan
&& !aborted
&& ieee80211_prep_hw_scan(local
)) {
310 int rc
= drv_hw_scan(local
, local
->scan_sdata
, local
->hw_scan_req
);
315 kfree(local
->hw_scan_req
);
316 local
->hw_scan_req
= NULL
;
318 if (local
->scan_req
!= local
->int_scan_req
)
319 cfg80211_scan_done(local
->scan_req
, aborted
);
320 local
->scan_req
= NULL
;
321 local
->scan_sdata
= NULL
;
324 local
->scan_channel
= NULL
;
326 /* Set power back to normal operating levels. */
327 ieee80211_hw_config(local
, 0);
330 ieee80211_configure_filter(local
);
331 drv_sw_scan_complete(local
);
332 ieee80211_offchannel_return(local
, true);
335 ieee80211_recalc_idle(local
);
337 ieee80211_mlme_notify_scan_completed(local
);
338 ieee80211_ibss_notify_scan_completed(local
);
339 ieee80211_mesh_notify_scan_completed(local
);
340 ieee80211_queue_work(&local
->hw
, &local
->work_work
);
343 void ieee80211_scan_completed(struct ieee80211_hw
*hw
, bool aborted
)
345 struct ieee80211_local
*local
= hw_to_local(hw
);
347 trace_api_scan_completed(local
, aborted
);
349 set_bit(SCAN_COMPLETED
, &local
->scanning
);
351 set_bit(SCAN_ABORTED
, &local
->scanning
);
352 ieee80211_queue_delayed_work(&local
->hw
, &local
->scan_work
, 0);
354 EXPORT_SYMBOL(ieee80211_scan_completed
);
356 static int ieee80211_start_sw_scan(struct ieee80211_local
*local
)
359 * Hardware/driver doesn't support hw_scan, so use software
360 * scanning instead. First send a nullfunc frame with power save
361 * bit on so that AP will buffer the frames for us while we are not
362 * listening, then send probe requests to each channel and wait for
363 * the responses. After all channels are scanned, tune back to the
364 * original channel and send a nullfunc frame with power save bit
365 * off to trigger the AP to send us all the buffered frames.
367 * Note that while local->sw_scanning is true everything else but
368 * nullfunc frames and probe requests will be dropped in
369 * ieee80211_tx_h_check_assoc().
371 drv_sw_scan_start(local
);
373 local
->leave_oper_channel_time
= jiffies
;
374 local
->next_scan_state
= SCAN_DECISION
;
375 local
->scan_channel_idx
= 0;
377 ieee80211_offchannel_stop_vifs(local
, true);
379 ieee80211_configure_filter(local
);
381 /* We need to set power level at maximum rate for scanning. */
382 ieee80211_hw_config(local
, 0);
384 ieee80211_queue_delayed_work(&local
->hw
,
385 &local
->scan_work
, 0);
391 static int __ieee80211_start_scan(struct ieee80211_sub_if_data
*sdata
,
392 struct cfg80211_scan_request
*req
)
394 struct ieee80211_local
*local
= sdata
->local
;
397 lockdep_assert_held(&local
->mtx
);
402 if (!list_empty(&local
->work_list
)) {
403 /* wait for the work to finish/time out */
404 local
->scan_req
= req
;
405 local
->scan_sdata
= sdata
;
409 if (local
->ops
->hw_scan
) {
412 local
->hw_scan_req
= kmalloc(
413 sizeof(*local
->hw_scan_req
) +
414 req
->n_channels
* sizeof(req
->channels
[0]) +
415 2 + IEEE80211_MAX_SSID_LEN
+ local
->scan_ies_len
+
416 req
->ie_len
, GFP_KERNEL
);
417 if (!local
->hw_scan_req
)
420 local
->hw_scan_req
->ssids
= req
->ssids
;
421 local
->hw_scan_req
->n_ssids
= req
->n_ssids
;
422 ies
= (u8
*)local
->hw_scan_req
+
423 sizeof(*local
->hw_scan_req
) +
424 req
->n_channels
* sizeof(req
->channels
[0]);
425 local
->hw_scan_req
->ie
= ies
;
427 local
->hw_scan_band
= 0;
430 * After allocating local->hw_scan_req, we must
431 * go through until ieee80211_prep_hw_scan(), so
432 * anything that might be changed here and leave
433 * this function early must not go after this
438 local
->scan_req
= req
;
439 local
->scan_sdata
= sdata
;
441 if (local
->ops
->hw_scan
)
442 __set_bit(SCAN_HW_SCANNING
, &local
->scanning
);
444 __set_bit(SCAN_SW_SCANNING
, &local
->scanning
);
446 ieee80211_recalc_idle(local
);
448 if (local
->ops
->hw_scan
) {
449 WARN_ON(!ieee80211_prep_hw_scan(local
));
450 rc
= drv_hw_scan(local
, sdata
, local
->hw_scan_req
);
452 rc
= ieee80211_start_sw_scan(local
);
455 kfree(local
->hw_scan_req
);
456 local
->hw_scan_req
= NULL
;
459 ieee80211_recalc_idle(local
);
461 local
->scan_req
= NULL
;
462 local
->scan_sdata
= NULL
;
469 ieee80211_scan_get_channel_time(struct ieee80211_channel
*chan
)
472 * TODO: channel switching also consumes quite some time,
473 * add that delay as well to get a better estimation
475 if (chan
->flags
& IEEE80211_CHAN_PASSIVE_SCAN
)
476 return IEEE80211_PASSIVE_CHANNEL_TIME
;
477 return IEEE80211_PROBE_DELAY
+ IEEE80211_CHANNEL_TIME
;
480 static void ieee80211_scan_state_decision(struct ieee80211_local
*local
,
481 unsigned long *next_delay
)
483 bool associated
= false;
484 bool tx_empty
= true;
486 bool listen_int_exceeded
;
487 unsigned long min_beacon_int
= 0;
488 struct ieee80211_sub_if_data
*sdata
;
489 struct ieee80211_channel
*next_chan
;
492 * check if at least one STA interface is associated,
493 * check if at least one STA interface has pending tx frames
494 * and grab the lowest used beacon interval
496 mutex_lock(&local
->iflist_mtx
);
497 list_for_each_entry(sdata
, &local
->interfaces
, list
) {
498 if (!ieee80211_sdata_running(sdata
))
501 if (sdata
->vif
.type
== NL80211_IFTYPE_STATION
) {
502 if (sdata
->u
.mgd
.associated
) {
505 if (sdata
->vif
.bss_conf
.beacon_int
<
506 min_beacon_int
|| min_beacon_int
== 0)
508 sdata
->vif
.bss_conf
.beacon_int
;
510 if (!qdisc_all_tx_empty(sdata
->dev
)) {
517 mutex_unlock(&local
->iflist_mtx
);
519 next_chan
= local
->scan_req
->channels
[local
->scan_channel_idx
];
522 * we're currently scanning a different channel, let's
523 * see if we can scan another channel without interfering
524 * with the current traffic situation.
526 * Since we don't know if the AP has pending frames for us
527 * we can only check for our tx queues and use the current
528 * pm_qos requirements for rx. Hence, if no tx traffic occurs
529 * at all we will scan as many channels in a row as the pm_qos
530 * latency allows us to. Additionally we also check for the
531 * currently negotiated listen interval to prevent losing
532 * frames unnecessarily.
534 * Otherwise switch back to the operating channel.
537 bad_latency
= time_after(jiffies
+
538 ieee80211_scan_get_channel_time(next_chan
),
539 local
->leave_oper_channel_time
+
540 usecs_to_jiffies(pm_qos_request(PM_QOS_NETWORK_LATENCY
)));
542 listen_int_exceeded
= time_after(jiffies
+
543 ieee80211_scan_get_channel_time(next_chan
),
544 local
->leave_oper_channel_time
+
545 usecs_to_jiffies(min_beacon_int
* 1024) *
546 local
->hw
.conf
.listen_interval
);
548 if (associated
&& (!tx_empty
|| bad_latency
|| listen_int_exceeded
))
549 local
->next_scan_state
= SCAN_SUSPEND
;
551 local
->next_scan_state
= SCAN_SET_CHANNEL
;
556 static void ieee80211_scan_state_set_channel(struct ieee80211_local
*local
,
557 unsigned long *next_delay
)
560 struct ieee80211_channel
*chan
;
563 chan
= local
->scan_req
->channels
[local
->scan_channel_idx
];
565 local
->scan_channel
= chan
;
567 if (ieee80211_hw_config(local
, IEEE80211_CONF_CHANGE_CHANNEL
))
570 /* advance state machine to next channel/band */
571 local
->scan_channel_idx
++;
574 /* if we skip this channel return to the decision state */
575 local
->next_scan_state
= SCAN_DECISION
;
580 * Probe delay is used to update the NAV, cf. 11.1.3.2.2
581 * (which unfortunately doesn't say _why_ step a) is done,
582 * but it waits for the probe delay or until a frame is
583 * received - and the received frame would update the NAV).
584 * For now, we do not support waiting until a frame is
587 * In any case, it is not necessary for a passive scan.
589 if (chan
->flags
& IEEE80211_CHAN_PASSIVE_SCAN
||
590 !local
->scan_req
->n_ssids
) {
591 *next_delay
= IEEE80211_PASSIVE_CHANNEL_TIME
;
592 local
->next_scan_state
= SCAN_DECISION
;
596 /* active scan, send probes */
597 *next_delay
= IEEE80211_PROBE_DELAY
;
598 local
->next_scan_state
= SCAN_SEND_PROBE
;
601 static void ieee80211_scan_state_send_probe(struct ieee80211_local
*local
,
602 unsigned long *next_delay
)
605 struct ieee80211_sub_if_data
*sdata
= local
->scan_sdata
;
606 enum ieee80211_band band
= local
->hw
.conf
.channel
->band
;
608 for (i
= 0; i
< local
->scan_req
->n_ssids
; i
++)
609 ieee80211_send_probe_req(
611 local
->scan_req
->ssids
[i
].ssid
,
612 local
->scan_req
->ssids
[i
].ssid_len
,
613 local
->scan_req
->ie
, local
->scan_req
->ie_len
,
614 local
->scan_req
->rates
[band
], false,
615 local
->scan_req
->no_cck
);
618 * After sending probe requests, wait for probe responses
621 *next_delay
= IEEE80211_CHANNEL_TIME
;
622 local
->next_scan_state
= SCAN_DECISION
;
625 static void ieee80211_scan_state_suspend(struct ieee80211_local
*local
,
626 unsigned long *next_delay
)
628 /* switch back to the operating channel */
629 local
->scan_channel
= NULL
;
630 ieee80211_hw_config(local
, IEEE80211_CONF_CHANGE_CHANNEL
);
633 * Re-enable vifs and beaconing. Leave PS
634 * in off-channel state..will put that back
635 * on-channel at the end of scanning.
637 ieee80211_offchannel_return(local
, false);
639 *next_delay
= HZ
/ 5;
640 /* afterwards, resume scan & go to next channel */
641 local
->next_scan_state
= SCAN_RESUME
;
644 static void ieee80211_scan_state_resume(struct ieee80211_local
*local
,
645 unsigned long *next_delay
)
647 /* PS already is in off-channel mode */
648 ieee80211_offchannel_stop_vifs(local
, false);
650 if (local
->ops
->flush
) {
651 drv_flush(local
, false);
654 *next_delay
= HZ
/ 10;
656 /* remember when we left the operating channel */
657 local
->leave_oper_channel_time
= jiffies
;
659 /* advance to the next channel to be scanned */
660 local
->next_scan_state
= SCAN_SET_CHANNEL
;
663 void ieee80211_scan_work(struct work_struct
*work
)
665 struct ieee80211_local
*local
=
666 container_of(work
, struct ieee80211_local
, scan_work
.work
);
667 struct ieee80211_sub_if_data
*sdata
;
668 unsigned long next_delay
= 0;
669 bool aborted
, hw_scan
;
671 mutex_lock(&local
->mtx
);
673 sdata
= local
->scan_sdata
;
675 if (test_and_clear_bit(SCAN_COMPLETED
, &local
->scanning
)) {
676 aborted
= test_and_clear_bit(SCAN_ABORTED
, &local
->scanning
);
680 if (!sdata
|| !local
->scan_req
)
683 if (local
->scan_req
&& !local
->scanning
) {
684 struct cfg80211_scan_request
*req
= local
->scan_req
;
687 local
->scan_req
= NULL
;
688 local
->scan_sdata
= NULL
;
690 rc
= __ieee80211_start_scan(sdata
, req
);
692 /* need to complete scan in cfg80211 */
693 local
->scan_req
= req
;
701 * Avoid re-scheduling when the sdata is going away.
703 if (!ieee80211_sdata_running(sdata
)) {
709 * as long as no delay is required advance immediately
710 * without scheduling a new work
713 if (!ieee80211_sdata_running(sdata
)) {
718 switch (local
->next_scan_state
) {
720 /* if no more bands/channels left, complete scan */
721 if (local
->scan_channel_idx
>= local
->scan_req
->n_channels
) {
725 ieee80211_scan_state_decision(local
, &next_delay
);
727 case SCAN_SET_CHANNEL
:
728 ieee80211_scan_state_set_channel(local
, &next_delay
);
730 case SCAN_SEND_PROBE
:
731 ieee80211_scan_state_send_probe(local
, &next_delay
);
734 ieee80211_scan_state_suspend(local
, &next_delay
);
737 ieee80211_scan_state_resume(local
, &next_delay
);
740 } while (next_delay
== 0);
742 ieee80211_queue_delayed_work(&local
->hw
, &local
->scan_work
, next_delay
);
746 hw_scan
= test_bit(SCAN_HW_SCANNING
, &local
->scanning
);
747 __ieee80211_scan_completed(&local
->hw
, aborted
, hw_scan
);
749 mutex_unlock(&local
->mtx
);
752 int ieee80211_request_scan(struct ieee80211_sub_if_data
*sdata
,
753 struct cfg80211_scan_request
*req
)
757 mutex_lock(&sdata
->local
->mtx
);
758 res
= __ieee80211_start_scan(sdata
, req
);
759 mutex_unlock(&sdata
->local
->mtx
);
764 int ieee80211_request_internal_scan(struct ieee80211_sub_if_data
*sdata
,
765 const u8
*ssid
, u8 ssid_len
,
766 struct ieee80211_channel
*chan
)
768 struct ieee80211_local
*local
= sdata
->local
;
770 enum ieee80211_band band
;
772 mutex_lock(&local
->mtx
);
778 /* fill internal scan request */
782 for (band
= 0; band
< IEEE80211_NUM_BANDS
; band
++) {
783 if (!local
->hw
.wiphy
->bands
[band
])
786 i
< local
->hw
.wiphy
->bands
[band
]->n_channels
;
788 local
->int_scan_req
->channels
[nchan
] =
789 &local
->hw
.wiphy
->bands
[band
]->channels
[i
];
794 local
->int_scan_req
->n_channels
= nchan
;
796 local
->int_scan_req
->channels
[0] = chan
;
797 local
->int_scan_req
->n_channels
= 1;
800 local
->int_scan_req
->ssids
= &local
->scan_ssid
;
801 local
->int_scan_req
->n_ssids
= 1;
802 memcpy(local
->int_scan_req
->ssids
[0].ssid
, ssid
, IEEE80211_MAX_SSID_LEN
);
803 local
->int_scan_req
->ssids
[0].ssid_len
= ssid_len
;
805 ret
= __ieee80211_start_scan(sdata
, sdata
->local
->int_scan_req
);
807 mutex_unlock(&local
->mtx
);
812 * Only call this function when a scan can't be queued -- under RTNL.
814 void ieee80211_scan_cancel(struct ieee80211_local
*local
)
817 * We are canceling software scan, or deferred scan that was not
818 * yet really started (see __ieee80211_start_scan ).
820 * Regarding hardware scan:
821 * - we can not call __ieee80211_scan_completed() as when
822 * SCAN_HW_SCANNING bit is set this function change
823 * local->hw_scan_req to operate on 5G band, what race with
824 * driver which can use local->hw_scan_req
826 * - we can not cancel scan_work since driver can schedule it
827 * by ieee80211_scan_completed(..., true) to finish scan
829 * Hence we only call the cancel_hw_scan() callback, but the low-level
830 * driver is still responsible for calling ieee80211_scan_completed()
831 * after the scan was completed/aborted.
834 mutex_lock(&local
->mtx
);
835 if (!local
->scan_req
)
838 if (test_bit(SCAN_HW_SCANNING
, &local
->scanning
)) {
839 if (local
->ops
->cancel_hw_scan
)
840 drv_cancel_hw_scan(local
, local
->scan_sdata
);
845 * If the work is currently running, it must be blocked on
846 * the mutex, but we'll set scan_sdata = NULL and it'll
847 * simply exit once it acquires the mutex.
849 cancel_delayed_work(&local
->scan_work
);
851 __ieee80211_scan_completed(&local
->hw
, true, false);
853 mutex_unlock(&local
->mtx
);
856 int ieee80211_request_sched_scan_start(struct ieee80211_sub_if_data
*sdata
,
857 struct cfg80211_sched_scan_request
*req
)
859 struct ieee80211_local
*local
= sdata
->local
;
862 mutex_lock(&sdata
->local
->mtx
);
864 if (local
->sched_scanning
) {
869 if (!local
->ops
->sched_scan_start
) {
874 for (i
= 0; i
< IEEE80211_NUM_BANDS
; i
++) {
875 local
->sched_scan_ies
.ie
[i
] = kzalloc(2 +
876 IEEE80211_MAX_SSID_LEN
+
877 local
->scan_ies_len
+
880 if (!local
->sched_scan_ies
.ie
[i
]) {
885 local
->sched_scan_ies
.len
[i
] =
886 ieee80211_build_preq_ies(local
,
887 local
->sched_scan_ies
.ie
[i
],
888 req
->ie
, req
->ie_len
, i
,
892 ret
= drv_sched_scan_start(local
, sdata
, req
,
893 &local
->sched_scan_ies
);
895 local
->sched_scanning
= true;
901 kfree(local
->sched_scan_ies
.ie
[--i
]);
903 mutex_unlock(&sdata
->local
->mtx
);
907 int ieee80211_request_sched_scan_stop(struct ieee80211_sub_if_data
*sdata
)
909 struct ieee80211_local
*local
= sdata
->local
;
912 mutex_lock(&sdata
->local
->mtx
);
914 if (!local
->ops
->sched_scan_stop
) {
919 if (local
->sched_scanning
) {
920 for (i
= 0; i
< IEEE80211_NUM_BANDS
; i
++)
921 kfree(local
->sched_scan_ies
.ie
[i
]);
923 drv_sched_scan_stop(local
, sdata
);
924 local
->sched_scanning
= false;
927 mutex_unlock(&sdata
->local
->mtx
);
932 void ieee80211_sched_scan_results(struct ieee80211_hw
*hw
)
934 struct ieee80211_local
*local
= hw_to_local(hw
);
936 trace_api_sched_scan_results(local
);
938 cfg80211_sched_scan_results(hw
->wiphy
);
940 EXPORT_SYMBOL(ieee80211_sched_scan_results
);
942 void ieee80211_sched_scan_stopped_work(struct work_struct
*work
)
944 struct ieee80211_local
*local
=
945 container_of(work
, struct ieee80211_local
,
946 sched_scan_stopped_work
);
949 mutex_lock(&local
->mtx
);
951 if (!local
->sched_scanning
) {
952 mutex_unlock(&local
->mtx
);
956 for (i
= 0; i
< IEEE80211_NUM_BANDS
; i
++)
957 kfree(local
->sched_scan_ies
.ie
[i
]);
959 local
->sched_scanning
= false;
961 mutex_unlock(&local
->mtx
);
963 cfg80211_sched_scan_stopped(local
->hw
.wiphy
);
966 void ieee80211_sched_scan_stopped(struct ieee80211_hw
*hw
)
968 struct ieee80211_local
*local
= hw_to_local(hw
);
970 trace_api_sched_scan_stopped(local
);
972 ieee80211_queue_work(&local
->hw
, &local
->sched_scan_stopped_work
);
974 EXPORT_SYMBOL(ieee80211_sched_scan_stopped
);