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Add a reattach command for fast reassociate-back-to-same-BSS
[thirdparty/hostap.git] / wpa_supplicant / scan.c
1 /*
2 * WPA Supplicant - Scanning
3 * Copyright (c) 2003-2014, Jouni Malinen <j@w1.fi>
4 *
5 * This software may be distributed under the terms of the BSD license.
6 * See README for more details.
7 */
8
9 #include "utils/includes.h"
10
11 #include "utils/common.h"
12 #include "utils/eloop.h"
13 #include "common/ieee802_11_defs.h"
14 #include "common/wpa_ctrl.h"
15 #include "config.h"
16 #include "wpa_supplicant_i.h"
17 #include "driver_i.h"
18 #include "wps_supplicant.h"
19 #include "p2p_supplicant.h"
20 #include "p2p/p2p.h"
21 #include "hs20_supplicant.h"
22 #include "notify.h"
23 #include "bss.h"
24 #include "scan.h"
25
26
27 static void wpa_supplicant_gen_assoc_event(struct wpa_supplicant *wpa_s)
28 {
29 struct wpa_ssid *ssid;
30 union wpa_event_data data;
31
32 ssid = wpa_supplicant_get_ssid(wpa_s);
33 if (ssid == NULL)
34 return;
35
36 if (wpa_s->current_ssid == NULL) {
37 wpa_s->current_ssid = ssid;
38 if (wpa_s->current_ssid != NULL)
39 wpas_notify_network_changed(wpa_s);
40 }
41 wpa_supplicant_initiate_eapol(wpa_s);
42 wpa_dbg(wpa_s, MSG_DEBUG, "Already associated with a configured "
43 "network - generating associated event");
44 os_memset(&data, 0, sizeof(data));
45 wpa_supplicant_event(wpa_s, EVENT_ASSOC, &data);
46 }
47
48
49 #ifdef CONFIG_WPS
50 static int wpas_wps_in_use(struct wpa_supplicant *wpa_s,
51 enum wps_request_type *req_type)
52 {
53 struct wpa_ssid *ssid;
54 int wps = 0;
55
56 for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
57 if (!(ssid->key_mgmt & WPA_KEY_MGMT_WPS))
58 continue;
59
60 wps = 1;
61 *req_type = wpas_wps_get_req_type(ssid);
62 if (!ssid->eap.phase1)
63 continue;
64
65 if (os_strstr(ssid->eap.phase1, "pbc=1"))
66 return 2;
67 }
68
69 #ifdef CONFIG_P2P
70 if (!wpa_s->global->p2p_disabled && wpa_s->global->p2p &&
71 !wpa_s->conf->p2p_disabled) {
72 wpa_s->wps->dev.p2p = 1;
73 if (!wps) {
74 wps = 1;
75 *req_type = WPS_REQ_ENROLLEE_INFO;
76 }
77 }
78 #endif /* CONFIG_P2P */
79
80 return wps;
81 }
82 #endif /* CONFIG_WPS */
83
84
85 /**
86 * wpa_supplicant_enabled_networks - Check whether there are enabled networks
87 * @wpa_s: Pointer to wpa_supplicant data
88 * Returns: 0 if no networks are enabled, >0 if networks are enabled
89 *
90 * This function is used to figure out whether any networks (or Interworking
91 * with enabled credentials and auto_interworking) are present in the current
92 * configuration.
93 */
94 int wpa_supplicant_enabled_networks(struct wpa_supplicant *wpa_s)
95 {
96 struct wpa_ssid *ssid = wpa_s->conf->ssid;
97 int count = 0, disabled = 0;
98 while (ssid) {
99 if (!wpas_network_disabled(wpa_s, ssid))
100 count++;
101 else
102 disabled++;
103 ssid = ssid->next;
104 }
105 if (wpa_s->conf->cred && wpa_s->conf->interworking &&
106 wpa_s->conf->auto_interworking)
107 count++;
108 if (count == 0 && disabled > 0) {
109 wpa_dbg(wpa_s, MSG_DEBUG, "No enabled networks (%d disabled "
110 "networks)", disabled);
111 }
112 return count;
113 }
114
115
116 static void wpa_supplicant_assoc_try(struct wpa_supplicant *wpa_s,
117 struct wpa_ssid *ssid)
118 {
119 while (ssid) {
120 if (!wpas_network_disabled(wpa_s, ssid))
121 break;
122 ssid = ssid->next;
123 }
124
125 /* ap_scan=2 mode - try to associate with each SSID. */
126 if (ssid == NULL) {
127 wpa_dbg(wpa_s, MSG_DEBUG, "wpa_supplicant_assoc_try: Reached "
128 "end of scan list - go back to beginning");
129 wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
130 wpa_supplicant_req_scan(wpa_s, 0, 0);
131 return;
132 }
133 if (ssid->next) {
134 /* Continue from the next SSID on the next attempt. */
135 wpa_s->prev_scan_ssid = ssid;
136 } else {
137 /* Start from the beginning of the SSID list. */
138 wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
139 }
140 wpa_supplicant_associate(wpa_s, NULL, ssid);
141 }
142
143
144 static void wpas_trigger_scan_cb(struct wpa_radio_work *work, int deinit)
145 {
146 struct wpa_supplicant *wpa_s = work->wpa_s;
147 struct wpa_driver_scan_params *params = work->ctx;
148 int ret;
149
150 if (deinit) {
151 if (!work->started) {
152 wpa_scan_free_params(params);
153 return;
154 }
155 wpa_supplicant_notify_scanning(wpa_s, 0);
156 wpas_notify_scan_done(wpa_s, 0);
157 wpa_s->scan_work = NULL;
158 return;
159 }
160
161 wpa_supplicant_notify_scanning(wpa_s, 1);
162
163 if (wpa_s->clear_driver_scan_cache)
164 params->only_new_results = 1;
165 ret = wpa_drv_scan(wpa_s, params);
166 wpa_scan_free_params(params);
167 work->ctx = NULL;
168 if (ret) {
169 wpa_supplicant_notify_scanning(wpa_s, 0);
170 wpas_notify_scan_done(wpa_s, 0);
171 radio_work_done(work);
172 return;
173 }
174
175 os_get_reltime(&wpa_s->scan_trigger_time);
176 wpa_s->scan_runs++;
177 wpa_s->normal_scans++;
178 wpa_s->own_scan_requested = 1;
179 wpa_s->clear_driver_scan_cache = 0;
180 wpa_s->scan_work = work;
181 }
182
183
184 /**
185 * wpa_supplicant_trigger_scan - Request driver to start a scan
186 * @wpa_s: Pointer to wpa_supplicant data
187 * @params: Scan parameters
188 * Returns: 0 on success, -1 on failure
189 */
190 int wpa_supplicant_trigger_scan(struct wpa_supplicant *wpa_s,
191 struct wpa_driver_scan_params *params)
192 {
193 struct wpa_driver_scan_params *ctx;
194
195 if (wpa_s->scan_work) {
196 wpa_dbg(wpa_s, MSG_INFO, "Reject scan trigger since one is already pending");
197 return -1;
198 }
199
200 ctx = wpa_scan_clone_params(params);
201 if (ctx == NULL)
202 return -1;
203
204 if (radio_add_work(wpa_s, 0, "scan", 0, wpas_trigger_scan_cb, ctx) < 0)
205 {
206 wpa_scan_free_params(ctx);
207 return -1;
208 }
209
210 return 0;
211 }
212
213
214 static void
215 wpa_supplicant_delayed_sched_scan_timeout(void *eloop_ctx, void *timeout_ctx)
216 {
217 struct wpa_supplicant *wpa_s = eloop_ctx;
218
219 wpa_dbg(wpa_s, MSG_DEBUG, "Starting delayed sched scan");
220
221 if (wpa_supplicant_req_sched_scan(wpa_s))
222 wpa_supplicant_req_scan(wpa_s, 0, 0);
223 }
224
225
226 static void
227 wpa_supplicant_sched_scan_timeout(void *eloop_ctx, void *timeout_ctx)
228 {
229 struct wpa_supplicant *wpa_s = eloop_ctx;
230
231 wpa_dbg(wpa_s, MSG_DEBUG, "Sched scan timeout - stopping it");
232
233 wpa_s->sched_scan_timed_out = 1;
234 wpa_supplicant_cancel_sched_scan(wpa_s);
235 }
236
237
238 int wpa_supplicant_start_sched_scan(struct wpa_supplicant *wpa_s,
239 struct wpa_driver_scan_params *params,
240 int interval)
241 {
242 int ret;
243
244 wpa_supplicant_notify_scanning(wpa_s, 1);
245 ret = wpa_drv_sched_scan(wpa_s, params, interval * 1000);
246 if (ret)
247 wpa_supplicant_notify_scanning(wpa_s, 0);
248 else
249 wpa_s->sched_scanning = 1;
250
251 return ret;
252 }
253
254
255 int wpa_supplicant_stop_sched_scan(struct wpa_supplicant *wpa_s)
256 {
257 int ret;
258
259 ret = wpa_drv_stop_sched_scan(wpa_s);
260 if (ret) {
261 wpa_dbg(wpa_s, MSG_DEBUG, "stopping sched_scan failed!");
262 /* TODO: what to do if stopping fails? */
263 return -1;
264 }
265
266 return ret;
267 }
268
269
270 static struct wpa_driver_scan_filter *
271 wpa_supplicant_build_filter_ssids(struct wpa_config *conf, size_t *num_ssids)
272 {
273 struct wpa_driver_scan_filter *ssids;
274 struct wpa_ssid *ssid;
275 size_t count;
276
277 *num_ssids = 0;
278 if (!conf->filter_ssids)
279 return NULL;
280
281 for (count = 0, ssid = conf->ssid; ssid; ssid = ssid->next) {
282 if (ssid->ssid && ssid->ssid_len)
283 count++;
284 }
285 if (count == 0)
286 return NULL;
287 ssids = os_zalloc(count * sizeof(struct wpa_driver_scan_filter));
288 if (ssids == NULL)
289 return NULL;
290
291 for (ssid = conf->ssid; ssid; ssid = ssid->next) {
292 if (!ssid->ssid || !ssid->ssid_len)
293 continue;
294 os_memcpy(ssids[*num_ssids].ssid, ssid->ssid, ssid->ssid_len);
295 ssids[*num_ssids].ssid_len = ssid->ssid_len;
296 (*num_ssids)++;
297 }
298
299 return ssids;
300 }
301
302
303 static void wpa_supplicant_optimize_freqs(
304 struct wpa_supplicant *wpa_s, struct wpa_driver_scan_params *params)
305 {
306 #ifdef CONFIG_P2P
307 if (params->freqs == NULL && wpa_s->p2p_in_provisioning &&
308 wpa_s->go_params) {
309 /* Optimize provisioning state scan based on GO information */
310 if (wpa_s->p2p_in_provisioning < 5 &&
311 wpa_s->go_params->freq > 0) {
312 wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only GO "
313 "preferred frequency %d MHz",
314 wpa_s->go_params->freq);
315 params->freqs = os_zalloc(2 * sizeof(int));
316 if (params->freqs)
317 params->freqs[0] = wpa_s->go_params->freq;
318 } else if (wpa_s->p2p_in_provisioning < 8 &&
319 wpa_s->go_params->freq_list[0]) {
320 wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only common "
321 "channels");
322 int_array_concat(&params->freqs,
323 wpa_s->go_params->freq_list);
324 if (params->freqs)
325 int_array_sort_unique(params->freqs);
326 }
327 wpa_s->p2p_in_provisioning++;
328 }
329 #endif /* CONFIG_P2P */
330
331 #ifdef CONFIG_WPS
332 if (params->freqs == NULL && wpa_s->after_wps && wpa_s->wps_freq) {
333 /*
334 * Optimize post-provisioning scan based on channel used
335 * during provisioning.
336 */
337 wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Scan only frequency %u MHz "
338 "that was used during provisioning", wpa_s->wps_freq);
339 params->freqs = os_zalloc(2 * sizeof(int));
340 if (params->freqs)
341 params->freqs[0] = wpa_s->wps_freq;
342 wpa_s->after_wps--;
343 } else if (wpa_s->after_wps)
344 wpa_s->after_wps--;
345
346 if (params->freqs == NULL && wpa_s->known_wps_freq && wpa_s->wps_freq)
347 {
348 /* Optimize provisioning scan based on already known channel */
349 wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Scan only frequency %u MHz",
350 wpa_s->wps_freq);
351 params->freqs = os_zalloc(2 * sizeof(int));
352 if (params->freqs)
353 params->freqs[0] = wpa_s->wps_freq;
354 wpa_s->known_wps_freq = 0; /* only do this once */
355 }
356 #endif /* CONFIG_WPS */
357 }
358
359
360 #ifdef CONFIG_INTERWORKING
361 static void wpas_add_interworking_elements(struct wpa_supplicant *wpa_s,
362 struct wpabuf *buf)
363 {
364 if (wpa_s->conf->interworking == 0)
365 return;
366
367 wpabuf_put_u8(buf, WLAN_EID_EXT_CAPAB);
368 wpabuf_put_u8(buf, 6);
369 wpabuf_put_u8(buf, 0x00);
370 wpabuf_put_u8(buf, 0x00);
371 wpabuf_put_u8(buf, 0x00);
372 wpabuf_put_u8(buf, 0x80); /* Bit 31 - Interworking */
373 wpabuf_put_u8(buf, 0x00);
374 #ifdef CONFIG_HS20
375 wpabuf_put_u8(buf, 0x40); /* Bit 46 - WNM-Notification */
376 #else /* CONFIG_HS20 */
377 wpabuf_put_u8(buf, 0x00);
378 #endif /* CONFIG_HS20 */
379
380 wpabuf_put_u8(buf, WLAN_EID_INTERWORKING);
381 wpabuf_put_u8(buf, is_zero_ether_addr(wpa_s->conf->hessid) ? 1 :
382 1 + ETH_ALEN);
383 wpabuf_put_u8(buf, wpa_s->conf->access_network_type);
384 /* No Venue Info */
385 if (!is_zero_ether_addr(wpa_s->conf->hessid))
386 wpabuf_put_data(buf, wpa_s->conf->hessid, ETH_ALEN);
387 }
388 #endif /* CONFIG_INTERWORKING */
389
390
391 static struct wpabuf * wpa_supplicant_extra_ies(struct wpa_supplicant *wpa_s)
392 {
393 struct wpabuf *extra_ie = NULL;
394 #ifdef CONFIG_WPS
395 int wps = 0;
396 enum wps_request_type req_type = WPS_REQ_ENROLLEE_INFO;
397 #endif /* CONFIG_WPS */
398
399 #ifdef CONFIG_INTERWORKING
400 if (wpa_s->conf->interworking &&
401 wpabuf_resize(&extra_ie, 100) == 0)
402 wpas_add_interworking_elements(wpa_s, extra_ie);
403 #endif /* CONFIG_INTERWORKING */
404
405 #ifdef CONFIG_WPS
406 wps = wpas_wps_in_use(wpa_s, &req_type);
407
408 if (wps) {
409 struct wpabuf *wps_ie;
410 wps_ie = wps_build_probe_req_ie(wps == 2 ? DEV_PW_PUSHBUTTON :
411 DEV_PW_DEFAULT,
412 &wpa_s->wps->dev,
413 wpa_s->wps->uuid, req_type,
414 0, NULL);
415 if (wps_ie) {
416 if (wpabuf_resize(&extra_ie, wpabuf_len(wps_ie)) == 0)
417 wpabuf_put_buf(extra_ie, wps_ie);
418 wpabuf_free(wps_ie);
419 }
420 }
421
422 #ifdef CONFIG_P2P
423 if (wps) {
424 size_t ielen = p2p_scan_ie_buf_len(wpa_s->global->p2p);
425 if (wpabuf_resize(&extra_ie, ielen) == 0)
426 wpas_p2p_scan_ie(wpa_s, extra_ie);
427 }
428 #endif /* CONFIG_P2P */
429
430 #endif /* CONFIG_WPS */
431
432 #ifdef CONFIG_HS20
433 if (wpa_s->conf->hs20 && wpabuf_resize(&extra_ie, 7) == 0)
434 wpas_hs20_add_indication(extra_ie, -1);
435 #endif /* CONFIG_HS20 */
436
437 return extra_ie;
438 }
439
440
441 #ifdef CONFIG_P2P
442
443 /*
444 * Check whether there are any enabled networks or credentials that could be
445 * used for a non-P2P connection.
446 */
447 static int non_p2p_network_enabled(struct wpa_supplicant *wpa_s)
448 {
449 struct wpa_ssid *ssid;
450
451 for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
452 if (wpas_network_disabled(wpa_s, ssid))
453 continue;
454 if (!ssid->p2p_group)
455 return 1;
456 }
457
458 if (wpa_s->conf->cred && wpa_s->conf->interworking &&
459 wpa_s->conf->auto_interworking)
460 return 1;
461
462 return 0;
463 }
464
465 #endif /* CONFIG_P2P */
466
467
468 static struct hostapd_hw_modes * get_mode(struct hostapd_hw_modes *modes,
469 u16 num_modes,
470 enum hostapd_hw_mode mode)
471 {
472 u16 i;
473
474 for (i = 0; i < num_modes; i++) {
475 if (modes[i].mode == mode)
476 return &modes[i];
477 }
478
479 return NULL;
480 }
481
482
483 static void wpa_setband_scan_freqs_list(struct wpa_supplicant *wpa_s,
484 enum hostapd_hw_mode band,
485 struct wpa_driver_scan_params *params)
486 {
487 /* Include only supported channels for the specified band */
488 struct hostapd_hw_modes *mode;
489 int count, i;
490
491 mode = get_mode(wpa_s->hw.modes, wpa_s->hw.num_modes, band);
492 if (mode == NULL) {
493 /* No channels supported in this band - use empty list */
494 params->freqs = os_zalloc(sizeof(int));
495 return;
496 }
497
498 params->freqs = os_zalloc((mode->num_channels + 1) * sizeof(int));
499 if (params->freqs == NULL)
500 return;
501 for (count = 0, i = 0; i < mode->num_channels; i++) {
502 if (mode->channels[i].flag & HOSTAPD_CHAN_DISABLED)
503 continue;
504 params->freqs[count++] = mode->channels[i].freq;
505 }
506 }
507
508
509 static void wpa_setband_scan_freqs(struct wpa_supplicant *wpa_s,
510 struct wpa_driver_scan_params *params)
511 {
512 if (wpa_s->hw.modes == NULL)
513 return; /* unknown what channels the driver supports */
514 if (params->freqs)
515 return; /* already using a limited channel set */
516 if (wpa_s->setband == WPA_SETBAND_5G)
517 wpa_setband_scan_freqs_list(wpa_s, HOSTAPD_MODE_IEEE80211A,
518 params);
519 else if (wpa_s->setband == WPA_SETBAND_2G)
520 wpa_setband_scan_freqs_list(wpa_s, HOSTAPD_MODE_IEEE80211G,
521 params);
522 }
523
524
525 static void wpa_supplicant_scan(void *eloop_ctx, void *timeout_ctx)
526 {
527 struct wpa_supplicant *wpa_s = eloop_ctx;
528 struct wpa_ssid *ssid;
529 int ret;
530 struct wpabuf *extra_ie = NULL;
531 struct wpa_driver_scan_params params;
532 struct wpa_driver_scan_params *scan_params;
533 size_t max_ssids;
534 enum wpa_states prev_state;
535
536 if (wpa_s->pno || wpa_s->pno_sched_pending) {
537 wpa_dbg(wpa_s, MSG_DEBUG, "Skip scan - PNO is in progress");
538 return;
539 }
540
541 if (wpa_s->wpa_state == WPA_INTERFACE_DISABLED) {
542 wpa_dbg(wpa_s, MSG_DEBUG, "Skip scan - interface disabled");
543 return;
544 }
545
546 if (wpa_s->disconnected && wpa_s->scan_req == NORMAL_SCAN_REQ) {
547 wpa_dbg(wpa_s, MSG_DEBUG, "Disconnected - do not scan");
548 wpa_supplicant_set_state(wpa_s, WPA_DISCONNECTED);
549 return;
550 }
551
552 if (wpa_s->scanning) {
553 /*
554 * If we are already in scanning state, we shall reschedule the
555 * the incoming scan request.
556 */
557 wpa_dbg(wpa_s, MSG_DEBUG, "Already scanning - Reschedule the incoming scan req");
558 wpa_supplicant_req_scan(wpa_s, 1, 0);
559 return;
560 }
561
562 if (!wpa_supplicant_enabled_networks(wpa_s) &&
563 wpa_s->scan_req == NORMAL_SCAN_REQ) {
564 wpa_dbg(wpa_s, MSG_DEBUG, "No enabled networks - do not scan");
565 wpa_supplicant_set_state(wpa_s, WPA_INACTIVE);
566 return;
567 }
568
569 if (wpa_s->conf->ap_scan != 0 &&
570 (wpa_s->drv_flags & WPA_DRIVER_FLAGS_WIRED)) {
571 wpa_dbg(wpa_s, MSG_DEBUG, "Using wired authentication - "
572 "overriding ap_scan configuration");
573 wpa_s->conf->ap_scan = 0;
574 wpas_notify_ap_scan_changed(wpa_s);
575 }
576
577 if (wpa_s->conf->ap_scan == 0) {
578 wpa_supplicant_gen_assoc_event(wpa_s);
579 return;
580 }
581
582 #ifdef CONFIG_P2P
583 if (wpas_p2p_in_progress(wpa_s)) {
584 wpa_dbg(wpa_s, MSG_DEBUG, "Delay station mode scan while P2P operation is in progress");
585 wpa_supplicant_req_scan(wpa_s, 5, 0);
586 return;
587 }
588 #endif /* CONFIG_P2P */
589
590 if (wpa_s->conf->ap_scan == 2)
591 max_ssids = 1;
592 else {
593 max_ssids = wpa_s->max_scan_ssids;
594 if (max_ssids > WPAS_MAX_SCAN_SSIDS)
595 max_ssids = WPAS_MAX_SCAN_SSIDS;
596 }
597
598 wpa_s->last_scan_req = wpa_s->scan_req;
599 wpa_s->scan_req = NORMAL_SCAN_REQ;
600
601 os_memset(&params, 0, sizeof(params));
602
603 prev_state = wpa_s->wpa_state;
604 if (wpa_s->wpa_state == WPA_DISCONNECTED ||
605 wpa_s->wpa_state == WPA_INACTIVE)
606 wpa_supplicant_set_state(wpa_s, WPA_SCANNING);
607
608 /*
609 * If autoscan has set its own scanning parameters
610 */
611 if (wpa_s->autoscan_params != NULL) {
612 scan_params = wpa_s->autoscan_params;
613 goto scan;
614 }
615
616 if (wpa_s->last_scan_req != MANUAL_SCAN_REQ &&
617 wpa_s->connect_without_scan) {
618 for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
619 if (ssid == wpa_s->connect_without_scan)
620 break;
621 }
622 wpa_s->connect_without_scan = NULL;
623 if (ssid) {
624 wpa_printf(MSG_DEBUG, "Start a pre-selected network "
625 "without scan step");
626 wpa_supplicant_associate(wpa_s, NULL, ssid);
627 return;
628 }
629 }
630
631 #ifdef CONFIG_P2P
632 if ((wpa_s->p2p_in_provisioning || wpa_s->show_group_started) &&
633 wpa_s->go_params) {
634 wpa_printf(MSG_DEBUG, "P2P: Use specific SSID for scan during P2P group formation (p2p_in_provisioning=%d show_group_started=%d)",
635 wpa_s->p2p_in_provisioning,
636 wpa_s->show_group_started);
637 params.ssids[0].ssid = wpa_s->go_params->ssid;
638 params.ssids[0].ssid_len = wpa_s->go_params->ssid_len;
639 params.num_ssids = 1;
640 goto ssid_list_set;
641 }
642 #endif /* CONFIG_P2P */
643
644 /* Find the starting point from which to continue scanning */
645 ssid = wpa_s->conf->ssid;
646 if (wpa_s->prev_scan_ssid != WILDCARD_SSID_SCAN) {
647 while (ssid) {
648 if (ssid == wpa_s->prev_scan_ssid) {
649 ssid = ssid->next;
650 break;
651 }
652 ssid = ssid->next;
653 }
654 }
655
656 if (wpa_s->last_scan_req != MANUAL_SCAN_REQ &&
657 wpa_s->conf->ap_scan == 2) {
658 wpa_s->connect_without_scan = NULL;
659 wpa_s->prev_scan_wildcard = 0;
660 wpa_supplicant_assoc_try(wpa_s, ssid);
661 return;
662 } else if (wpa_s->conf->ap_scan == 2) {
663 /*
664 * User-initiated scan request in ap_scan == 2; scan with
665 * wildcard SSID.
666 */
667 ssid = NULL;
668 } else if (wpa_s->reattach && wpa_s->current_ssid != NULL) {
669 /*
670 * Perform single-channel single-SSID scan for
671 * reassociate-to-same-BSS operation.
672 */
673 /* Setup SSID */
674 ssid = wpa_s->current_ssid;
675 wpa_hexdump_ascii(MSG_DEBUG, "Scan SSID",
676 ssid->ssid, ssid->ssid_len);
677 params.ssids[0].ssid = ssid->ssid;
678 params.ssids[0].ssid_len = ssid->ssid_len;
679 params.num_ssids = 1;
680
681 /*
682 * Allocate memory for frequency array, allocate one extra
683 * slot for the zero-terminator.
684 */
685 params.freqs = os_malloc(sizeof(int) * 2);
686 if (params.freqs == NULL) {
687 wpa_dbg(wpa_s, MSG_ERROR, "Memory allocation failed");
688 return;
689 }
690 params.freqs[0] = wpa_s->assoc_freq;
691 params.freqs[1] = 0;
692
693 /*
694 * Reset the reattach flag so that we fall back to full scan if
695 * this scan fails.
696 */
697 wpa_s->reattach = 0;
698 } else {
699 struct wpa_ssid *start = ssid, *tssid;
700 int freqs_set = 0;
701 if (ssid == NULL && max_ssids > 1)
702 ssid = wpa_s->conf->ssid;
703 while (ssid) {
704 if (!wpas_network_disabled(wpa_s, ssid) &&
705 ssid->scan_ssid) {
706 wpa_hexdump_ascii(MSG_DEBUG, "Scan SSID",
707 ssid->ssid, ssid->ssid_len);
708 params.ssids[params.num_ssids].ssid =
709 ssid->ssid;
710 params.ssids[params.num_ssids].ssid_len =
711 ssid->ssid_len;
712 params.num_ssids++;
713 if (params.num_ssids + 1 >= max_ssids)
714 break;
715 }
716 ssid = ssid->next;
717 if (ssid == start)
718 break;
719 if (ssid == NULL && max_ssids > 1 &&
720 start != wpa_s->conf->ssid)
721 ssid = wpa_s->conf->ssid;
722 }
723
724 for (tssid = wpa_s->conf->ssid; tssid; tssid = tssid->next) {
725 if (wpas_network_disabled(wpa_s, tssid))
726 continue;
727 if ((params.freqs || !freqs_set) && tssid->scan_freq) {
728 int_array_concat(&params.freqs,
729 tssid->scan_freq);
730 } else {
731 os_free(params.freqs);
732 params.freqs = NULL;
733 }
734 freqs_set = 1;
735 }
736 int_array_sort_unique(params.freqs);
737 }
738
739 if (ssid && max_ssids == 1) {
740 /*
741 * If the driver is limited to 1 SSID at a time interleave
742 * wildcard SSID scans with specific SSID scans to avoid
743 * waiting a long time for a wildcard scan.
744 */
745 if (!wpa_s->prev_scan_wildcard) {
746 params.ssids[0].ssid = NULL;
747 params.ssids[0].ssid_len = 0;
748 wpa_s->prev_scan_wildcard = 1;
749 wpa_dbg(wpa_s, MSG_DEBUG, "Starting AP scan for "
750 "wildcard SSID (Interleave with specific)");
751 } else {
752 wpa_s->prev_scan_ssid = ssid;
753 wpa_s->prev_scan_wildcard = 0;
754 wpa_dbg(wpa_s, MSG_DEBUG,
755 "Starting AP scan for specific SSID: %s",
756 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
757 }
758 } else if (ssid) {
759 /* max_ssids > 1 */
760
761 wpa_s->prev_scan_ssid = ssid;
762 wpa_dbg(wpa_s, MSG_DEBUG, "Include wildcard SSID in "
763 "the scan request");
764 params.num_ssids++;
765 } else if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
766 wpa_s->manual_scan_passive && params.num_ssids == 0) {
767 wpa_dbg(wpa_s, MSG_DEBUG, "Use passive scan based on manual request");
768 } else {
769 wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
770 params.num_ssids++;
771 wpa_dbg(wpa_s, MSG_DEBUG, "Starting AP scan for wildcard "
772 "SSID");
773 }
774 #ifdef CONFIG_P2P
775 ssid_list_set:
776 #endif /* CONFIG_P2P */
777
778 wpa_supplicant_optimize_freqs(wpa_s, &params);
779 extra_ie = wpa_supplicant_extra_ies(wpa_s);
780
781 if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
782 wpa_s->manual_scan_only_new)
783 params.only_new_results = 1;
784
785 if (wpa_s->last_scan_req == MANUAL_SCAN_REQ && params.freqs == NULL &&
786 wpa_s->manual_scan_freqs) {
787 wpa_dbg(wpa_s, MSG_DEBUG, "Limit manual scan to specified channels");
788 params.freqs = wpa_s->manual_scan_freqs;
789 wpa_s->manual_scan_freqs = NULL;
790 }
791
792 if (params.freqs == NULL && wpa_s->next_scan_freqs) {
793 wpa_dbg(wpa_s, MSG_DEBUG, "Optimize scan based on previously "
794 "generated frequency list");
795 params.freqs = wpa_s->next_scan_freqs;
796 } else
797 os_free(wpa_s->next_scan_freqs);
798 wpa_s->next_scan_freqs = NULL;
799 wpa_setband_scan_freqs(wpa_s, &params);
800
801 /* See if user specified frequencies. If so, scan only those. */
802 if (wpa_s->conf->freq_list && !params.freqs) {
803 wpa_dbg(wpa_s, MSG_DEBUG,
804 "Optimize scan based on conf->freq_list");
805 int_array_concat(&params.freqs, wpa_s->conf->freq_list);
806 }
807
808 /* Use current associated channel? */
809 if (wpa_s->conf->scan_cur_freq && !params.freqs) {
810 unsigned int num = wpa_s->num_multichan_concurrent;
811
812 params.freqs = os_calloc(num + 1, sizeof(int));
813 if (params.freqs) {
814 num = get_shared_radio_freqs(wpa_s, params.freqs, num);
815 if (num > 0) {
816 wpa_dbg(wpa_s, MSG_DEBUG, "Scan only the "
817 "current operating channels since "
818 "scan_cur_freq is enabled");
819 } else {
820 os_free(params.freqs);
821 params.freqs = NULL;
822 }
823 }
824 }
825
826 params.filter_ssids = wpa_supplicant_build_filter_ssids(
827 wpa_s->conf, &params.num_filter_ssids);
828 if (extra_ie) {
829 params.extra_ies = wpabuf_head(extra_ie);
830 params.extra_ies_len = wpabuf_len(extra_ie);
831 }
832
833 #ifdef CONFIG_P2P
834 if (wpa_s->p2p_in_provisioning ||
835 (wpa_s->show_group_started && wpa_s->go_params)) {
836 /*
837 * The interface may not yet be in P2P mode, so we have to
838 * explicitly request P2P probe to disable CCK rates.
839 */
840 params.p2p_probe = 1;
841 }
842 #endif /* CONFIG_P2P */
843
844 scan_params = &params;
845
846 scan:
847 #ifdef CONFIG_P2P
848 /*
849 * If the driver does not support multi-channel concurrency and a
850 * virtual interface that shares the same radio with the wpa_s interface
851 * is operating there may not be need to scan other channels apart from
852 * the current operating channel on the other virtual interface. Filter
853 * out other channels in case we are trying to find a connection for a
854 * station interface when we are not configured to prefer station
855 * connection and a concurrent operation is already in process.
856 */
857 if (wpa_s->scan_for_connection &&
858 wpa_s->last_scan_req == NORMAL_SCAN_REQ &&
859 !scan_params->freqs && !params.freqs &&
860 wpas_is_p2p_prioritized(wpa_s) &&
861 wpa_s->p2p_group_interface == NOT_P2P_GROUP_INTERFACE &&
862 non_p2p_network_enabled(wpa_s)) {
863 unsigned int num = wpa_s->num_multichan_concurrent;
864
865 params.freqs = os_calloc(num + 1, sizeof(int));
866 if (params.freqs) {
867 num = get_shared_radio_freqs(wpa_s, params.freqs, num);
868 if (num > 0 && num == wpa_s->num_multichan_concurrent) {
869 wpa_dbg(wpa_s, MSG_DEBUG, "Scan only the current operating channels since all channels are already used");
870 } else {
871 os_free(params.freqs);
872 params.freqs = NULL;
873 }
874 }
875 }
876 #endif /* CONFIG_P2P */
877
878 ret = wpa_supplicant_trigger_scan(wpa_s, scan_params);
879
880 if (ret && wpa_s->last_scan_req == MANUAL_SCAN_REQ && params.freqs &&
881 !wpa_s->manual_scan_freqs) {
882 /* Restore manual_scan_freqs for the next attempt */
883 wpa_s->manual_scan_freqs = params.freqs;
884 params.freqs = NULL;
885 }
886
887 wpabuf_free(extra_ie);
888 os_free(params.freqs);
889 os_free(params.filter_ssids);
890
891 if (ret) {
892 wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate AP scan");
893 if (prev_state != wpa_s->wpa_state)
894 wpa_supplicant_set_state(wpa_s, prev_state);
895 /* Restore scan_req since we will try to scan again */
896 wpa_s->scan_req = wpa_s->last_scan_req;
897 wpa_supplicant_req_scan(wpa_s, 1, 0);
898 } else {
899 wpa_s->scan_for_connection = 0;
900 }
901 }
902
903
904 void wpa_supplicant_update_scan_int(struct wpa_supplicant *wpa_s, int sec)
905 {
906 struct os_reltime remaining, new_int;
907 int cancelled;
908
909 cancelled = eloop_cancel_timeout_one(wpa_supplicant_scan, wpa_s, NULL,
910 &remaining);
911
912 new_int.sec = sec;
913 new_int.usec = 0;
914 if (cancelled && os_reltime_before(&remaining, &new_int)) {
915 new_int.sec = remaining.sec;
916 new_int.usec = remaining.usec;
917 }
918
919 if (cancelled) {
920 eloop_register_timeout(new_int.sec, new_int.usec,
921 wpa_supplicant_scan, wpa_s, NULL);
922 }
923 wpa_s->scan_interval = sec;
924 }
925
926
927 /**
928 * wpa_supplicant_req_scan - Schedule a scan for neighboring access points
929 * @wpa_s: Pointer to wpa_supplicant data
930 * @sec: Number of seconds after which to scan
931 * @usec: Number of microseconds after which to scan
932 *
933 * This function is used to schedule a scan for neighboring access points after
934 * the specified time.
935 */
936 void wpa_supplicant_req_scan(struct wpa_supplicant *wpa_s, int sec, int usec)
937 {
938 int res = eloop_deplete_timeout(sec, usec, wpa_supplicant_scan, wpa_s,
939 NULL);
940 if (res == 1) {
941 wpa_dbg(wpa_s, MSG_DEBUG, "Rescheduling scan request: %d.%06d sec",
942 sec, usec);
943 } else if (res == 0) {
944 wpa_dbg(wpa_s, MSG_DEBUG, "Ignore new scan request for %d.%06d sec since an earlier request is scheduled to trigger sooner",
945 sec, usec);
946 } else {
947 wpa_dbg(wpa_s, MSG_DEBUG, "Setting scan request: %d.%06d sec",
948 sec, usec);
949 eloop_register_timeout(sec, usec, wpa_supplicant_scan, wpa_s, NULL);
950 }
951 }
952
953
954 /**
955 * wpa_supplicant_delayed_sched_scan - Request a delayed scheduled scan
956 * @wpa_s: Pointer to wpa_supplicant data
957 * @sec: Number of seconds after which to scan
958 * @usec: Number of microseconds after which to scan
959 * Returns: 0 on success or -1 otherwise
960 *
961 * This function is used to schedule periodic scans for neighboring
962 * access points after the specified time.
963 */
964 int wpa_supplicant_delayed_sched_scan(struct wpa_supplicant *wpa_s,
965 int sec, int usec)
966 {
967 if (!wpa_s->sched_scan_supported)
968 return -1;
969
970 eloop_register_timeout(sec, usec,
971 wpa_supplicant_delayed_sched_scan_timeout,
972 wpa_s, NULL);
973
974 return 0;
975 }
976
977
978 /**
979 * wpa_supplicant_req_sched_scan - Start a periodic scheduled scan
980 * @wpa_s: Pointer to wpa_supplicant data
981 * Returns: 0 is sched_scan was started or -1 otherwise
982 *
983 * This function is used to schedule periodic scans for neighboring
984 * access points repeating the scan continuously.
985 */
986 int wpa_supplicant_req_sched_scan(struct wpa_supplicant *wpa_s)
987 {
988 struct wpa_driver_scan_params params;
989 struct wpa_driver_scan_params *scan_params;
990 enum wpa_states prev_state;
991 struct wpa_ssid *ssid = NULL;
992 struct wpabuf *extra_ie = NULL;
993 int ret;
994 unsigned int max_sched_scan_ssids;
995 int wildcard = 0;
996 int need_ssids;
997
998 if (!wpa_s->sched_scan_supported)
999 return -1;
1000
1001 if (wpa_s->max_sched_scan_ssids > WPAS_MAX_SCAN_SSIDS)
1002 max_sched_scan_ssids = WPAS_MAX_SCAN_SSIDS;
1003 else
1004 max_sched_scan_ssids = wpa_s->max_sched_scan_ssids;
1005 if (max_sched_scan_ssids < 1 || wpa_s->conf->disable_scan_offload)
1006 return -1;
1007
1008 if (wpa_s->sched_scanning) {
1009 wpa_dbg(wpa_s, MSG_DEBUG, "Already sched scanning");
1010 return 0;
1011 }
1012
1013 need_ssids = 0;
1014 for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
1015 if (!wpas_network_disabled(wpa_s, ssid) && !ssid->scan_ssid) {
1016 /* Use wildcard SSID to find this network */
1017 wildcard = 1;
1018 } else if (!wpas_network_disabled(wpa_s, ssid) &&
1019 ssid->ssid_len)
1020 need_ssids++;
1021
1022 #ifdef CONFIG_WPS
1023 if (!wpas_network_disabled(wpa_s, ssid) &&
1024 ssid->key_mgmt == WPA_KEY_MGMT_WPS) {
1025 /*
1026 * Normal scan is more reliable and faster for WPS
1027 * operations and since these are for short periods of
1028 * time, the benefit of trying to use sched_scan would
1029 * be limited.
1030 */
1031 wpa_dbg(wpa_s, MSG_DEBUG, "Use normal scan instead of "
1032 "sched_scan for WPS");
1033 return -1;
1034 }
1035 #endif /* CONFIG_WPS */
1036 }
1037 if (wildcard)
1038 need_ssids++;
1039
1040 if (wpa_s->normal_scans < 3 &&
1041 (need_ssids <= wpa_s->max_scan_ssids ||
1042 wpa_s->max_scan_ssids >= (int) max_sched_scan_ssids)) {
1043 /*
1044 * When normal scan can speed up operations, use that for the
1045 * first operations before starting the sched_scan to allow
1046 * user space sleep more. We do this only if the normal scan
1047 * has functionality that is suitable for this or if the
1048 * sched_scan does not have better support for multiple SSIDs.
1049 */
1050 wpa_dbg(wpa_s, MSG_DEBUG, "Use normal scan instead of "
1051 "sched_scan for initial scans (normal_scans=%d)",
1052 wpa_s->normal_scans);
1053 return -1;
1054 }
1055
1056 os_memset(&params, 0, sizeof(params));
1057
1058 /* If we can't allocate space for the filters, we just don't filter */
1059 params.filter_ssids = os_zalloc(wpa_s->max_match_sets *
1060 sizeof(struct wpa_driver_scan_filter));
1061
1062 prev_state = wpa_s->wpa_state;
1063 if (wpa_s->wpa_state == WPA_DISCONNECTED ||
1064 wpa_s->wpa_state == WPA_INACTIVE)
1065 wpa_supplicant_set_state(wpa_s, WPA_SCANNING);
1066
1067 if (wpa_s->autoscan_params != NULL) {
1068 scan_params = wpa_s->autoscan_params;
1069 goto scan;
1070 }
1071
1072 /* Find the starting point from which to continue scanning */
1073 ssid = wpa_s->conf->ssid;
1074 if (wpa_s->prev_sched_ssid) {
1075 while (ssid) {
1076 if (ssid == wpa_s->prev_sched_ssid) {
1077 ssid = ssid->next;
1078 break;
1079 }
1080 ssid = ssid->next;
1081 }
1082 }
1083
1084 if (!ssid || !wpa_s->prev_sched_ssid) {
1085 wpa_dbg(wpa_s, MSG_DEBUG, "Beginning of SSID list");
1086 if (wpa_s->conf->sched_scan_interval)
1087 wpa_s->sched_scan_interval =
1088 wpa_s->conf->sched_scan_interval;
1089 if (wpa_s->sched_scan_interval == 0)
1090 wpa_s->sched_scan_interval = 10;
1091 wpa_s->sched_scan_timeout = max_sched_scan_ssids * 2;
1092 wpa_s->first_sched_scan = 1;
1093 ssid = wpa_s->conf->ssid;
1094 wpa_s->prev_sched_ssid = ssid;
1095 }
1096
1097 if (wildcard) {
1098 wpa_dbg(wpa_s, MSG_DEBUG, "Add wildcard SSID to sched_scan");
1099 params.num_ssids++;
1100 }
1101
1102 while (ssid) {
1103 if (wpas_network_disabled(wpa_s, ssid))
1104 goto next;
1105
1106 if (params.num_filter_ssids < wpa_s->max_match_sets &&
1107 params.filter_ssids && ssid->ssid && ssid->ssid_len) {
1108 wpa_dbg(wpa_s, MSG_DEBUG, "add to filter ssid: %s",
1109 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
1110 os_memcpy(params.filter_ssids[params.num_filter_ssids].ssid,
1111 ssid->ssid, ssid->ssid_len);
1112 params.filter_ssids[params.num_filter_ssids].ssid_len =
1113 ssid->ssid_len;
1114 params.num_filter_ssids++;
1115 } else if (params.filter_ssids && ssid->ssid && ssid->ssid_len)
1116 {
1117 wpa_dbg(wpa_s, MSG_DEBUG, "Not enough room for SSID "
1118 "filter for sched_scan - drop filter");
1119 os_free(params.filter_ssids);
1120 params.filter_ssids = NULL;
1121 params.num_filter_ssids = 0;
1122 }
1123
1124 if (ssid->scan_ssid && ssid->ssid && ssid->ssid_len) {
1125 if (params.num_ssids == max_sched_scan_ssids)
1126 break; /* only room for broadcast SSID */
1127 wpa_dbg(wpa_s, MSG_DEBUG,
1128 "add to active scan ssid: %s",
1129 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
1130 params.ssids[params.num_ssids].ssid =
1131 ssid->ssid;
1132 params.ssids[params.num_ssids].ssid_len =
1133 ssid->ssid_len;
1134 params.num_ssids++;
1135 if (params.num_ssids >= max_sched_scan_ssids) {
1136 wpa_s->prev_sched_ssid = ssid;
1137 do {
1138 ssid = ssid->next;
1139 } while (ssid &&
1140 (wpas_network_disabled(wpa_s, ssid) ||
1141 !ssid->scan_ssid));
1142 break;
1143 }
1144 }
1145
1146 next:
1147 wpa_s->prev_sched_ssid = ssid;
1148 ssid = ssid->next;
1149 }
1150
1151 if (params.num_filter_ssids == 0) {
1152 os_free(params.filter_ssids);
1153 params.filter_ssids = NULL;
1154 }
1155
1156 extra_ie = wpa_supplicant_extra_ies(wpa_s);
1157 if (extra_ie) {
1158 params.extra_ies = wpabuf_head(extra_ie);
1159 params.extra_ies_len = wpabuf_len(extra_ie);
1160 }
1161
1162 if (wpa_s->conf->filter_rssi)
1163 params.filter_rssi = wpa_s->conf->filter_rssi;
1164
1165 scan_params = &params;
1166
1167 scan:
1168 if (ssid || !wpa_s->first_sched_scan) {
1169 wpa_dbg(wpa_s, MSG_DEBUG,
1170 "Starting sched scan: interval %d timeout %d",
1171 wpa_s->sched_scan_interval, wpa_s->sched_scan_timeout);
1172 } else {
1173 wpa_dbg(wpa_s, MSG_DEBUG,
1174 "Starting sched scan: interval %d (no timeout)",
1175 wpa_s->sched_scan_interval);
1176 }
1177
1178 wpa_setband_scan_freqs(wpa_s, scan_params);
1179
1180 ret = wpa_supplicant_start_sched_scan(wpa_s, scan_params,
1181 wpa_s->sched_scan_interval);
1182 wpabuf_free(extra_ie);
1183 os_free(params.filter_ssids);
1184 if (ret) {
1185 wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate sched scan");
1186 if (prev_state != wpa_s->wpa_state)
1187 wpa_supplicant_set_state(wpa_s, prev_state);
1188 return ret;
1189 }
1190
1191 /* If we have more SSIDs to scan, add a timeout so we scan them too */
1192 if (ssid || !wpa_s->first_sched_scan) {
1193 wpa_s->sched_scan_timed_out = 0;
1194 eloop_register_timeout(wpa_s->sched_scan_timeout, 0,
1195 wpa_supplicant_sched_scan_timeout,
1196 wpa_s, NULL);
1197 wpa_s->first_sched_scan = 0;
1198 wpa_s->sched_scan_timeout /= 2;
1199 wpa_s->sched_scan_interval *= 2;
1200 if (wpa_s->sched_scan_timeout < wpa_s->sched_scan_interval) {
1201 wpa_s->sched_scan_interval = 10;
1202 wpa_s->sched_scan_timeout = max_sched_scan_ssids * 2;
1203 }
1204 }
1205
1206 /* If there is no more ssids, start next time from the beginning */
1207 if (!ssid)
1208 wpa_s->prev_sched_ssid = NULL;
1209
1210 return 0;
1211 }
1212
1213
1214 /**
1215 * wpa_supplicant_cancel_scan - Cancel a scheduled scan request
1216 * @wpa_s: Pointer to wpa_supplicant data
1217 *
1218 * This function is used to cancel a scan request scheduled with
1219 * wpa_supplicant_req_scan().
1220 */
1221 void wpa_supplicant_cancel_scan(struct wpa_supplicant *wpa_s)
1222 {
1223 wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling scan request");
1224 eloop_cancel_timeout(wpa_supplicant_scan, wpa_s, NULL);
1225 }
1226
1227
1228 /**
1229 * wpa_supplicant_cancel_delayed_sched_scan - Stop a delayed scheduled scan
1230 * @wpa_s: Pointer to wpa_supplicant data
1231 *
1232 * This function is used to stop a delayed scheduled scan.
1233 */
1234 void wpa_supplicant_cancel_delayed_sched_scan(struct wpa_supplicant *wpa_s)
1235 {
1236 if (!wpa_s->sched_scan_supported)
1237 return;
1238
1239 wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling delayed sched scan");
1240 eloop_cancel_timeout(wpa_supplicant_delayed_sched_scan_timeout,
1241 wpa_s, NULL);
1242 }
1243
1244
1245 /**
1246 * wpa_supplicant_cancel_sched_scan - Stop running scheduled scans
1247 * @wpa_s: Pointer to wpa_supplicant data
1248 *
1249 * This function is used to stop a periodic scheduled scan.
1250 */
1251 void wpa_supplicant_cancel_sched_scan(struct wpa_supplicant *wpa_s)
1252 {
1253 if (!wpa_s->sched_scanning)
1254 return;
1255
1256 wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling sched scan");
1257 eloop_cancel_timeout(wpa_supplicant_sched_scan_timeout, wpa_s, NULL);
1258 wpa_supplicant_stop_sched_scan(wpa_s);
1259 }
1260
1261
1262 /**
1263 * wpa_supplicant_notify_scanning - Indicate possible scan state change
1264 * @wpa_s: Pointer to wpa_supplicant data
1265 * @scanning: Whether scanning is currently in progress
1266 *
1267 * This function is to generate scanning notifycations. It is called whenever
1268 * there may have been a change in scanning (scan started, completed, stopped).
1269 * wpas_notify_scanning() is called whenever the scanning state changed from the
1270 * previously notified state.
1271 */
1272 void wpa_supplicant_notify_scanning(struct wpa_supplicant *wpa_s,
1273 int scanning)
1274 {
1275 if (wpa_s->scanning != scanning) {
1276 wpa_s->scanning = scanning;
1277 wpas_notify_scanning(wpa_s);
1278 }
1279 }
1280
1281
1282 static int wpa_scan_get_max_rate(const struct wpa_scan_res *res)
1283 {
1284 int rate = 0;
1285 const u8 *ie;
1286 int i;
1287
1288 ie = wpa_scan_get_ie(res, WLAN_EID_SUPP_RATES);
1289 for (i = 0; ie && i < ie[1]; i++) {
1290 if ((ie[i + 2] & 0x7f) > rate)
1291 rate = ie[i + 2] & 0x7f;
1292 }
1293
1294 ie = wpa_scan_get_ie(res, WLAN_EID_EXT_SUPP_RATES);
1295 for (i = 0; ie && i < ie[1]; i++) {
1296 if ((ie[i + 2] & 0x7f) > rate)
1297 rate = ie[i + 2] & 0x7f;
1298 }
1299
1300 return rate;
1301 }
1302
1303
1304 /**
1305 * wpa_scan_get_ie - Fetch a specified information element from a scan result
1306 * @res: Scan result entry
1307 * @ie: Information element identitifier (WLAN_EID_*)
1308 * Returns: Pointer to the information element (id field) or %NULL if not found
1309 *
1310 * This function returns the first matching information element in the scan
1311 * result.
1312 */
1313 const u8 * wpa_scan_get_ie(const struct wpa_scan_res *res, u8 ie)
1314 {
1315 const u8 *end, *pos;
1316
1317 pos = (const u8 *) (res + 1);
1318 end = pos + res->ie_len;
1319
1320 while (pos + 1 < end) {
1321 if (pos + 2 + pos[1] > end)
1322 break;
1323 if (pos[0] == ie)
1324 return pos;
1325 pos += 2 + pos[1];
1326 }
1327
1328 return NULL;
1329 }
1330
1331
1332 /**
1333 * wpa_scan_get_vendor_ie - Fetch vendor information element from a scan result
1334 * @res: Scan result entry
1335 * @vendor_type: Vendor type (four octets starting the IE payload)
1336 * Returns: Pointer to the information element (id field) or %NULL if not found
1337 *
1338 * This function returns the first matching information element in the scan
1339 * result.
1340 */
1341 const u8 * wpa_scan_get_vendor_ie(const struct wpa_scan_res *res,
1342 u32 vendor_type)
1343 {
1344 const u8 *end, *pos;
1345
1346 pos = (const u8 *) (res + 1);
1347 end = pos + res->ie_len;
1348
1349 while (pos + 1 < end) {
1350 if (pos + 2 + pos[1] > end)
1351 break;
1352 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1353 vendor_type == WPA_GET_BE32(&pos[2]))
1354 return pos;
1355 pos += 2 + pos[1];
1356 }
1357
1358 return NULL;
1359 }
1360
1361
1362 /**
1363 * wpa_scan_get_vendor_ie_beacon - Fetch vendor information from a scan result
1364 * @res: Scan result entry
1365 * @vendor_type: Vendor type (four octets starting the IE payload)
1366 * Returns: Pointer to the information element (id field) or %NULL if not found
1367 *
1368 * This function returns the first matching information element in the scan
1369 * result.
1370 *
1371 * This function is like wpa_scan_get_vendor_ie(), but uses IE buffer only
1372 * from Beacon frames instead of either Beacon or Probe Response frames.
1373 */
1374 const u8 * wpa_scan_get_vendor_ie_beacon(const struct wpa_scan_res *res,
1375 u32 vendor_type)
1376 {
1377 const u8 *end, *pos;
1378
1379 if (res->beacon_ie_len == 0)
1380 return NULL;
1381
1382 pos = (const u8 *) (res + 1);
1383 pos += res->ie_len;
1384 end = pos + res->beacon_ie_len;
1385
1386 while (pos + 1 < end) {
1387 if (pos + 2 + pos[1] > end)
1388 break;
1389 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1390 vendor_type == WPA_GET_BE32(&pos[2]))
1391 return pos;
1392 pos += 2 + pos[1];
1393 }
1394
1395 return NULL;
1396 }
1397
1398
1399 /**
1400 * wpa_scan_get_vendor_ie_multi - Fetch vendor IE data from a scan result
1401 * @res: Scan result entry
1402 * @vendor_type: Vendor type (four octets starting the IE payload)
1403 * Returns: Pointer to the information element payload or %NULL if not found
1404 *
1405 * This function returns concatenated payload of possibly fragmented vendor
1406 * specific information elements in the scan result. The caller is responsible
1407 * for freeing the returned buffer.
1408 */
1409 struct wpabuf * wpa_scan_get_vendor_ie_multi(const struct wpa_scan_res *res,
1410 u32 vendor_type)
1411 {
1412 struct wpabuf *buf;
1413 const u8 *end, *pos;
1414
1415 buf = wpabuf_alloc(res->ie_len);
1416 if (buf == NULL)
1417 return NULL;
1418
1419 pos = (const u8 *) (res + 1);
1420 end = pos + res->ie_len;
1421
1422 while (pos + 1 < end) {
1423 if (pos + 2 + pos[1] > end)
1424 break;
1425 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1426 vendor_type == WPA_GET_BE32(&pos[2]))
1427 wpabuf_put_data(buf, pos + 2 + 4, pos[1] - 4);
1428 pos += 2 + pos[1];
1429 }
1430
1431 if (wpabuf_len(buf) == 0) {
1432 wpabuf_free(buf);
1433 buf = NULL;
1434 }
1435
1436 return buf;
1437 }
1438
1439
1440 /*
1441 * Channels with a great SNR can operate at full rate. What is a great SNR?
1442 * This doc https://supportforums.cisco.com/docs/DOC-12954 says, "the general
1443 * rule of thumb is that any SNR above 20 is good." This one
1444 * http://www.cisco.com/en/US/tech/tk722/tk809/technologies_q_and_a_item09186a00805e9a96.shtml#qa23
1445 * recommends 25 as a minimum SNR for 54 Mbps data rate. 30 is chosen here as a
1446 * conservative value.
1447 */
1448 #define GREAT_SNR 30
1449
1450 /* Compare function for sorting scan results. Return >0 if @b is considered
1451 * better. */
1452 static int wpa_scan_result_compar(const void *a, const void *b)
1453 {
1454 #define IS_5GHZ(n) (n > 4000)
1455 #define MIN(a,b) a < b ? a : b
1456 struct wpa_scan_res **_wa = (void *) a;
1457 struct wpa_scan_res **_wb = (void *) b;
1458 struct wpa_scan_res *wa = *_wa;
1459 struct wpa_scan_res *wb = *_wb;
1460 int wpa_a, wpa_b, maxrate_a, maxrate_b;
1461 int snr_a, snr_b;
1462
1463 /* WPA/WPA2 support preferred */
1464 wpa_a = wpa_scan_get_vendor_ie(wa, WPA_IE_VENDOR_TYPE) != NULL ||
1465 wpa_scan_get_ie(wa, WLAN_EID_RSN) != NULL;
1466 wpa_b = wpa_scan_get_vendor_ie(wb, WPA_IE_VENDOR_TYPE) != NULL ||
1467 wpa_scan_get_ie(wb, WLAN_EID_RSN) != NULL;
1468
1469 if (wpa_b && !wpa_a)
1470 return 1;
1471 if (!wpa_b && wpa_a)
1472 return -1;
1473
1474 /* privacy support preferred */
1475 if ((wa->caps & IEEE80211_CAP_PRIVACY) == 0 &&
1476 (wb->caps & IEEE80211_CAP_PRIVACY))
1477 return 1;
1478 if ((wa->caps & IEEE80211_CAP_PRIVACY) &&
1479 (wb->caps & IEEE80211_CAP_PRIVACY) == 0)
1480 return -1;
1481
1482 if ((wa->flags & wb->flags & WPA_SCAN_LEVEL_DBM) &&
1483 !((wa->flags | wb->flags) & WPA_SCAN_NOISE_INVALID)) {
1484 snr_a = MIN(wa->level - wa->noise, GREAT_SNR);
1485 snr_b = MIN(wb->level - wb->noise, GREAT_SNR);
1486 } else {
1487 /* Not suitable information to calculate SNR, so use level */
1488 snr_a = wa->level;
1489 snr_b = wb->level;
1490 }
1491
1492 /* best/max rate preferred if SNR close enough */
1493 if ((snr_a && snr_b && abs(snr_b - snr_a) < 5) ||
1494 (wa->qual && wb->qual && abs(wb->qual - wa->qual) < 10)) {
1495 maxrate_a = wpa_scan_get_max_rate(wa);
1496 maxrate_b = wpa_scan_get_max_rate(wb);
1497 if (maxrate_a != maxrate_b)
1498 return maxrate_b - maxrate_a;
1499 if (IS_5GHZ(wa->freq) ^ IS_5GHZ(wb->freq))
1500 return IS_5GHZ(wa->freq) ? -1 : 1;
1501 }
1502
1503 /* use freq for channel preference */
1504
1505 /* all things being equal, use SNR; if SNRs are
1506 * identical, use quality values since some drivers may only report
1507 * that value and leave the signal level zero */
1508 if (snr_b == snr_a)
1509 return wb->qual - wa->qual;
1510 return snr_b - snr_a;
1511 #undef MIN
1512 #undef IS_5GHZ
1513 }
1514
1515
1516 #ifdef CONFIG_WPS
1517 /* Compare function for sorting scan results when searching a WPS AP for
1518 * provisioning. Return >0 if @b is considered better. */
1519 static int wpa_scan_result_wps_compar(const void *a, const void *b)
1520 {
1521 struct wpa_scan_res **_wa = (void *) a;
1522 struct wpa_scan_res **_wb = (void *) b;
1523 struct wpa_scan_res *wa = *_wa;
1524 struct wpa_scan_res *wb = *_wb;
1525 int uses_wps_a, uses_wps_b;
1526 struct wpabuf *wps_a, *wps_b;
1527 int res;
1528
1529 /* Optimization - check WPS IE existence before allocated memory and
1530 * doing full reassembly. */
1531 uses_wps_a = wpa_scan_get_vendor_ie(wa, WPS_IE_VENDOR_TYPE) != NULL;
1532 uses_wps_b = wpa_scan_get_vendor_ie(wb, WPS_IE_VENDOR_TYPE) != NULL;
1533 if (uses_wps_a && !uses_wps_b)
1534 return -1;
1535 if (!uses_wps_a && uses_wps_b)
1536 return 1;
1537
1538 if (uses_wps_a && uses_wps_b) {
1539 wps_a = wpa_scan_get_vendor_ie_multi(wa, WPS_IE_VENDOR_TYPE);
1540 wps_b = wpa_scan_get_vendor_ie_multi(wb, WPS_IE_VENDOR_TYPE);
1541 res = wps_ap_priority_compar(wps_a, wps_b);
1542 wpabuf_free(wps_a);
1543 wpabuf_free(wps_b);
1544 if (res)
1545 return res;
1546 }
1547
1548 /*
1549 * Do not use current AP security policy as a sorting criteria during
1550 * WPS provisioning step since the AP may get reconfigured at the
1551 * completion of provisioning.
1552 */
1553
1554 /* all things being equal, use signal level; if signal levels are
1555 * identical, use quality values since some drivers may only report
1556 * that value and leave the signal level zero */
1557 if (wb->level == wa->level)
1558 return wb->qual - wa->qual;
1559 return wb->level - wa->level;
1560 }
1561 #endif /* CONFIG_WPS */
1562
1563
1564 static void dump_scan_res(struct wpa_scan_results *scan_res)
1565 {
1566 #ifndef CONFIG_NO_STDOUT_DEBUG
1567 size_t i;
1568
1569 if (scan_res->res == NULL || scan_res->num == 0)
1570 return;
1571
1572 wpa_printf(MSG_EXCESSIVE, "Sorted scan results");
1573
1574 for (i = 0; i < scan_res->num; i++) {
1575 struct wpa_scan_res *r = scan_res->res[i];
1576 u8 *pos;
1577 if ((r->flags & (WPA_SCAN_LEVEL_DBM | WPA_SCAN_NOISE_INVALID))
1578 == WPA_SCAN_LEVEL_DBM) {
1579 int snr = r->level - r->noise;
1580 wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d "
1581 "noise=%d level=%d snr=%d%s flags=0x%x "
1582 "age=%u",
1583 MAC2STR(r->bssid), r->freq, r->qual,
1584 r->noise, r->level, snr,
1585 snr >= GREAT_SNR ? "*" : "", r->flags,
1586 r->age);
1587 } else {
1588 wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d "
1589 "noise=%d level=%d flags=0x%x age=%u",
1590 MAC2STR(r->bssid), r->freq, r->qual,
1591 r->noise, r->level, r->flags, r->age);
1592 }
1593 pos = (u8 *) (r + 1);
1594 if (r->ie_len)
1595 wpa_hexdump(MSG_EXCESSIVE, "IEs", pos, r->ie_len);
1596 pos += r->ie_len;
1597 if (r->beacon_ie_len)
1598 wpa_hexdump(MSG_EXCESSIVE, "Beacon IEs",
1599 pos, r->beacon_ie_len);
1600 }
1601 #endif /* CONFIG_NO_STDOUT_DEBUG */
1602 }
1603
1604
1605 /**
1606 * wpa_supplicant_filter_bssid_match - Is the specified BSSID allowed
1607 * @wpa_s: Pointer to wpa_supplicant data
1608 * @bssid: BSSID to check
1609 * Returns: 0 if the BSSID is filtered or 1 if not
1610 *
1611 * This function is used to filter out specific BSSIDs from scan reslts mainly
1612 * for testing purposes (SET bssid_filter ctrl_iface command).
1613 */
1614 int wpa_supplicant_filter_bssid_match(struct wpa_supplicant *wpa_s,
1615 const u8 *bssid)
1616 {
1617 size_t i;
1618
1619 if (wpa_s->bssid_filter == NULL)
1620 return 1;
1621
1622 for (i = 0; i < wpa_s->bssid_filter_count; i++) {
1623 if (os_memcmp(wpa_s->bssid_filter + i * ETH_ALEN, bssid,
1624 ETH_ALEN) == 0)
1625 return 1;
1626 }
1627
1628 return 0;
1629 }
1630
1631
1632 static void filter_scan_res(struct wpa_supplicant *wpa_s,
1633 struct wpa_scan_results *res)
1634 {
1635 size_t i, j;
1636
1637 if (wpa_s->bssid_filter == NULL)
1638 return;
1639
1640 for (i = 0, j = 0; i < res->num; i++) {
1641 if (wpa_supplicant_filter_bssid_match(wpa_s,
1642 res->res[i]->bssid)) {
1643 res->res[j++] = res->res[i];
1644 } else {
1645 os_free(res->res[i]);
1646 res->res[i] = NULL;
1647 }
1648 }
1649
1650 if (res->num != j) {
1651 wpa_printf(MSG_DEBUG, "Filtered out %d scan results",
1652 (int) (res->num - j));
1653 res->num = j;
1654 }
1655 }
1656
1657
1658 /**
1659 * wpa_supplicant_get_scan_results - Get scan results
1660 * @wpa_s: Pointer to wpa_supplicant data
1661 * @info: Information about what was scanned or %NULL if not available
1662 * @new_scan: Whether a new scan was performed
1663 * Returns: Scan results, %NULL on failure
1664 *
1665 * This function request the current scan results from the driver and updates
1666 * the local BSS list wpa_s->bss. The caller is responsible for freeing the
1667 * results with wpa_scan_results_free().
1668 */
1669 struct wpa_scan_results *
1670 wpa_supplicant_get_scan_results(struct wpa_supplicant *wpa_s,
1671 struct scan_info *info, int new_scan)
1672 {
1673 struct wpa_scan_results *scan_res;
1674 size_t i;
1675 int (*compar)(const void *, const void *) = wpa_scan_result_compar;
1676
1677 scan_res = wpa_drv_get_scan_results2(wpa_s);
1678 if (scan_res == NULL) {
1679 wpa_dbg(wpa_s, MSG_DEBUG, "Failed to get scan results");
1680 return NULL;
1681 }
1682 if (scan_res->fetch_time.sec == 0) {
1683 /*
1684 * Make sure we have a valid timestamp if the driver wrapper
1685 * does not set this.
1686 */
1687 os_get_reltime(&scan_res->fetch_time);
1688 }
1689 filter_scan_res(wpa_s, scan_res);
1690
1691 #ifdef CONFIG_WPS
1692 if (wpas_wps_searching(wpa_s)) {
1693 wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Order scan results with WPS "
1694 "provisioning rules");
1695 compar = wpa_scan_result_wps_compar;
1696 }
1697 #endif /* CONFIG_WPS */
1698
1699 qsort(scan_res->res, scan_res->num, sizeof(struct wpa_scan_res *),
1700 compar);
1701 dump_scan_res(scan_res);
1702
1703 wpa_bss_update_start(wpa_s);
1704 for (i = 0; i < scan_res->num; i++)
1705 wpa_bss_update_scan_res(wpa_s, scan_res->res[i],
1706 &scan_res->fetch_time);
1707 wpa_bss_update_end(wpa_s, info, new_scan);
1708
1709 return scan_res;
1710 }
1711
1712
1713 /**
1714 * wpa_supplicant_update_scan_results - Update scan results from the driver
1715 * @wpa_s: Pointer to wpa_supplicant data
1716 * Returns: 0 on success, -1 on failure
1717 *
1718 * This function updates the BSS table within wpa_supplicant based on the
1719 * currently available scan results from the driver without requesting a new
1720 * scan. This is used in cases where the driver indicates an association
1721 * (including roaming within ESS) and wpa_supplicant does not yet have the
1722 * needed information to complete the connection (e.g., to perform validation
1723 * steps in 4-way handshake).
1724 */
1725 int wpa_supplicant_update_scan_results(struct wpa_supplicant *wpa_s)
1726 {
1727 struct wpa_scan_results *scan_res;
1728 scan_res = wpa_supplicant_get_scan_results(wpa_s, NULL, 0);
1729 if (scan_res == NULL)
1730 return -1;
1731 wpa_scan_results_free(scan_res);
1732
1733 return 0;
1734 }
1735
1736
1737 /**
1738 * scan_only_handler - Reports scan results
1739 */
1740 void scan_only_handler(struct wpa_supplicant *wpa_s,
1741 struct wpa_scan_results *scan_res)
1742 {
1743 wpa_dbg(wpa_s, MSG_DEBUG, "Scan-only results received");
1744 if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
1745 wpa_s->manual_scan_use_id && wpa_s->own_scan_running) {
1746 wpa_msg_ctrl(wpa_s, MSG_INFO, WPA_EVENT_SCAN_RESULTS "id=%u",
1747 wpa_s->manual_scan_id);
1748 wpa_s->manual_scan_use_id = 0;
1749 } else {
1750 wpa_msg_ctrl(wpa_s, MSG_INFO, WPA_EVENT_SCAN_RESULTS);
1751 }
1752 wpas_notify_scan_results(wpa_s);
1753 wpas_notify_scan_done(wpa_s, 1);
1754 if (wpa_s->scan_work) {
1755 struct wpa_radio_work *work = wpa_s->scan_work;
1756 wpa_s->scan_work = NULL;
1757 radio_work_done(work);
1758 }
1759 }
1760
1761
1762 int wpas_scan_scheduled(struct wpa_supplicant *wpa_s)
1763 {
1764 return eloop_is_timeout_registered(wpa_supplicant_scan, wpa_s, NULL);
1765 }
1766
1767
1768 struct wpa_driver_scan_params *
1769 wpa_scan_clone_params(const struct wpa_driver_scan_params *src)
1770 {
1771 struct wpa_driver_scan_params *params;
1772 size_t i;
1773 u8 *n;
1774
1775 params = os_zalloc(sizeof(*params));
1776 if (params == NULL)
1777 return NULL;
1778
1779 for (i = 0; i < src->num_ssids; i++) {
1780 if (src->ssids[i].ssid) {
1781 n = os_malloc(src->ssids[i].ssid_len);
1782 if (n == NULL)
1783 goto failed;
1784 os_memcpy(n, src->ssids[i].ssid,
1785 src->ssids[i].ssid_len);
1786 params->ssids[i].ssid = n;
1787 params->ssids[i].ssid_len = src->ssids[i].ssid_len;
1788 }
1789 }
1790 params->num_ssids = src->num_ssids;
1791
1792 if (src->extra_ies) {
1793 n = os_malloc(src->extra_ies_len);
1794 if (n == NULL)
1795 goto failed;
1796 os_memcpy(n, src->extra_ies, src->extra_ies_len);
1797 params->extra_ies = n;
1798 params->extra_ies_len = src->extra_ies_len;
1799 }
1800
1801 if (src->freqs) {
1802 int len = int_array_len(src->freqs);
1803 params->freqs = os_malloc((len + 1) * sizeof(int));
1804 if (params->freqs == NULL)
1805 goto failed;
1806 os_memcpy(params->freqs, src->freqs, (len + 1) * sizeof(int));
1807 }
1808
1809 if (src->filter_ssids) {
1810 params->filter_ssids = os_malloc(sizeof(*params->filter_ssids) *
1811 src->num_filter_ssids);
1812 if (params->filter_ssids == NULL)
1813 goto failed;
1814 os_memcpy(params->filter_ssids, src->filter_ssids,
1815 sizeof(*params->filter_ssids) *
1816 src->num_filter_ssids);
1817 params->num_filter_ssids = src->num_filter_ssids;
1818 }
1819
1820 params->filter_rssi = src->filter_rssi;
1821 params->p2p_probe = src->p2p_probe;
1822 params->only_new_results = src->only_new_results;
1823
1824 return params;
1825
1826 failed:
1827 wpa_scan_free_params(params);
1828 return NULL;
1829 }
1830
1831
1832 void wpa_scan_free_params(struct wpa_driver_scan_params *params)
1833 {
1834 size_t i;
1835
1836 if (params == NULL)
1837 return;
1838
1839 for (i = 0; i < params->num_ssids; i++)
1840 os_free((u8 *) params->ssids[i].ssid);
1841 os_free((u8 *) params->extra_ies);
1842 os_free(params->freqs);
1843 os_free(params->filter_ssids);
1844 os_free(params);
1845 }
1846
1847
1848 int wpas_start_pno(struct wpa_supplicant *wpa_s)
1849 {
1850 int ret, interval;
1851 size_t i, num_ssid;
1852 struct wpa_ssid *ssid;
1853 struct wpa_driver_scan_params params;
1854
1855 if (!wpa_s->sched_scan_supported)
1856 return -1;
1857
1858 if (wpa_s->pno || wpa_s->pno_sched_pending)
1859 return 0;
1860
1861 if ((wpa_s->wpa_state > WPA_SCANNING) &&
1862 (wpa_s->wpa_state <= WPA_COMPLETED)) {
1863 wpa_printf(MSG_ERROR, "PNO: In assoc process");
1864 return -EAGAIN;
1865 }
1866
1867 if (wpa_s->wpa_state == WPA_SCANNING) {
1868 wpa_supplicant_cancel_scan(wpa_s);
1869 if (wpa_s->sched_scanning) {
1870 wpa_printf(MSG_DEBUG, "Schedule PNO on completion of "
1871 "ongoing sched scan");
1872 wpa_supplicant_cancel_sched_scan(wpa_s);
1873 wpa_s->pno_sched_pending = 1;
1874 return 0;
1875 }
1876 }
1877
1878 os_memset(&params, 0, sizeof(params));
1879
1880 num_ssid = 0;
1881 ssid = wpa_s->conf->ssid;
1882 while (ssid) {
1883 if (!wpas_network_disabled(wpa_s, ssid))
1884 num_ssid++;
1885 ssid = ssid->next;
1886 }
1887 if (num_ssid > WPAS_MAX_SCAN_SSIDS) {
1888 wpa_printf(MSG_DEBUG, "PNO: Use only the first %u SSIDs from "
1889 "%u", WPAS_MAX_SCAN_SSIDS, (unsigned int) num_ssid);
1890 num_ssid = WPAS_MAX_SCAN_SSIDS;
1891 }
1892
1893 if (num_ssid == 0) {
1894 wpa_printf(MSG_DEBUG, "PNO: No configured SSIDs");
1895 return -1;
1896 }
1897
1898 params.filter_ssids = os_malloc(sizeof(struct wpa_driver_scan_filter) *
1899 num_ssid);
1900 if (params.filter_ssids == NULL)
1901 return -1;
1902 i = 0;
1903 ssid = wpa_s->conf->ssid;
1904 while (ssid) {
1905 if (!wpas_network_disabled(wpa_s, ssid)) {
1906 params.ssids[i].ssid = ssid->ssid;
1907 params.ssids[i].ssid_len = ssid->ssid_len;
1908 params.num_ssids++;
1909 os_memcpy(params.filter_ssids[i].ssid, ssid->ssid,
1910 ssid->ssid_len);
1911 params.filter_ssids[i].ssid_len = ssid->ssid_len;
1912 params.num_filter_ssids++;
1913 i++;
1914 if (i == num_ssid)
1915 break;
1916 }
1917 ssid = ssid->next;
1918 }
1919
1920 if (wpa_s->conf->filter_rssi)
1921 params.filter_rssi = wpa_s->conf->filter_rssi;
1922
1923 interval = wpa_s->conf->sched_scan_interval ?
1924 wpa_s->conf->sched_scan_interval : 10;
1925
1926 ret = wpa_supplicant_start_sched_scan(wpa_s, &params, interval);
1927 os_free(params.filter_ssids);
1928 if (ret == 0)
1929 wpa_s->pno = 1;
1930 else
1931 wpa_msg(wpa_s, MSG_ERROR, "Failed to schedule PNO");
1932 return ret;
1933 }
1934
1935
1936 int wpas_stop_pno(struct wpa_supplicant *wpa_s)
1937 {
1938 int ret = 0;
1939
1940 if (!wpa_s->pno)
1941 return 0;
1942
1943 ret = wpa_supplicant_stop_sched_scan(wpa_s);
1944
1945 wpa_s->pno = 0;
1946 wpa_s->pno_sched_pending = 0;
1947
1948 if (wpa_s->wpa_state == WPA_SCANNING)
1949 wpa_supplicant_req_scan(wpa_s, 0, 0);
1950
1951 return ret;
1952 }
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