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Use radio work for scan requests
[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 "gas_query.h"
25 #include "scan.h"
26
27
28 static void wpa_supplicant_gen_assoc_event(struct wpa_supplicant *wpa_s)
29 {
30 struct wpa_ssid *ssid;
31 union wpa_event_data data;
32
33 ssid = wpa_supplicant_get_ssid(wpa_s);
34 if (ssid == NULL)
35 return;
36
37 if (wpa_s->current_ssid == NULL) {
38 wpa_s->current_ssid = ssid;
39 if (wpa_s->current_ssid != NULL)
40 wpas_notify_network_changed(wpa_s);
41 }
42 wpa_supplicant_initiate_eapol(wpa_s);
43 wpa_dbg(wpa_s, MSG_DEBUG, "Already associated with a configured "
44 "network - generating associated event");
45 os_memset(&data, 0, sizeof(data));
46 wpa_supplicant_event(wpa_s, EVENT_ASSOC, &data);
47 }
48
49
50 #ifdef CONFIG_WPS
51 static int wpas_wps_in_use(struct wpa_supplicant *wpa_s,
52 enum wps_request_type *req_type)
53 {
54 struct wpa_ssid *ssid;
55 int wps = 0;
56
57 for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
58 if (!(ssid->key_mgmt & WPA_KEY_MGMT_WPS))
59 continue;
60
61 wps = 1;
62 *req_type = wpas_wps_get_req_type(ssid);
63 if (!ssid->eap.phase1)
64 continue;
65
66 if (os_strstr(ssid->eap.phase1, "pbc=1"))
67 return 2;
68 }
69
70 #ifdef CONFIG_P2P
71 if (!wpa_s->global->p2p_disabled && wpa_s->global->p2p &&
72 !wpa_s->conf->p2p_disabled) {
73 wpa_s->wps->dev.p2p = 1;
74 if (!wps) {
75 wps = 1;
76 *req_type = WPS_REQ_ENROLLEE_INFO;
77 }
78 }
79 #endif /* CONFIG_P2P */
80
81 return wps;
82 }
83 #endif /* CONFIG_WPS */
84
85
86 /**
87 * wpa_supplicant_enabled_networks - Check whether there are enabled networks
88 * @wpa_s: Pointer to wpa_supplicant data
89 * Returns: 0 if no networks are enabled, >0 if networks are enabled
90 *
91 * This function is used to figure out whether any networks (or Interworking
92 * with enabled credentials and auto_interworking) are present in the current
93 * configuration.
94 */
95 int wpa_supplicant_enabled_networks(struct wpa_supplicant *wpa_s)
96 {
97 struct wpa_ssid *ssid = wpa_s->conf->ssid;
98 int count = 0, disabled = 0;
99 while (ssid) {
100 if (!wpas_network_disabled(wpa_s, ssid))
101 count++;
102 else
103 disabled++;
104 ssid = ssid->next;
105 }
106 if (wpa_s->conf->cred && wpa_s->conf->interworking &&
107 wpa_s->conf->auto_interworking)
108 count++;
109 if (count == 0 && disabled > 0) {
110 wpa_dbg(wpa_s, MSG_DEBUG, "No enabled networks (%d disabled "
111 "networks)", disabled);
112 }
113 return count;
114 }
115
116
117 static void wpa_supplicant_assoc_try(struct wpa_supplicant *wpa_s,
118 struct wpa_ssid *ssid)
119 {
120 while (ssid) {
121 if (!wpas_network_disabled(wpa_s, ssid))
122 break;
123 ssid = ssid->next;
124 }
125
126 /* ap_scan=2 mode - try to associate with each SSID. */
127 if (ssid == NULL) {
128 wpa_dbg(wpa_s, MSG_DEBUG, "wpa_supplicant_assoc_try: Reached "
129 "end of scan list - go back to beginning");
130 wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
131 wpa_supplicant_req_scan(wpa_s, 0, 0);
132 return;
133 }
134 if (ssid->next) {
135 /* Continue from the next SSID on the next attempt. */
136 wpa_s->prev_scan_ssid = ssid;
137 } else {
138 /* Start from the beginning of the SSID list. */
139 wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
140 }
141 wpa_supplicant_associate(wpa_s, NULL, ssid);
142 }
143
144
145 static void wpas_trigger_scan_cb(struct wpa_radio_work *work, int deinit)
146 {
147 struct wpa_supplicant *wpa_s = work->wpa_s;
148 struct wpa_driver_scan_params *params = work->ctx;
149 int ret;
150
151 if (deinit) {
152 wpa_scan_free_params(params);
153 return;
154 }
155
156 wpa_supplicant_notify_scanning(wpa_s, 1);
157
158 if (wpa_s->clear_driver_scan_cache)
159 params->only_new_results = 1;
160 ret = wpa_drv_scan(wpa_s, params);
161 wpa_scan_free_params(params);
162 work->ctx = NULL;
163 if (ret) {
164 wpa_supplicant_notify_scanning(wpa_s, 0);
165 wpas_notify_scan_done(wpa_s, 0);
166 radio_work_done(work);
167 return;
168 }
169
170 os_get_reltime(&wpa_s->scan_trigger_time);
171 wpa_s->scan_runs++;
172 wpa_s->normal_scans++;
173 wpa_s->own_scan_requested = 1;
174 wpa_s->clear_driver_scan_cache = 0;
175 wpa_s->scan_work = work;
176 }
177
178
179 /**
180 * wpa_supplicant_trigger_scan - Request driver to start a scan
181 * @wpa_s: Pointer to wpa_supplicant data
182 * @params: Scan parameters
183 * Returns: 0 on success, -1 on failure
184 */
185 int wpa_supplicant_trigger_scan(struct wpa_supplicant *wpa_s,
186 struct wpa_driver_scan_params *params)
187 {
188 struct wpa_driver_scan_params *ctx;
189
190 if (wpa_s->scan_work) {
191 wpa_dbg(wpa_s, MSG_INFO, "Reject scan trigger since one is already pending");
192 return -1;
193 }
194
195 ctx = wpa_scan_clone_params(params);
196 if (ctx == NULL)
197 return -1;
198
199 if (radio_add_work(wpa_s, 0, "scan", 0, wpas_trigger_scan_cb, ctx) < 0)
200 {
201 wpa_scan_free_params(ctx);
202 return -1;
203 }
204
205 return 0;
206 }
207
208
209 static void
210 wpa_supplicant_delayed_sched_scan_timeout(void *eloop_ctx, void *timeout_ctx)
211 {
212 struct wpa_supplicant *wpa_s = eloop_ctx;
213
214 wpa_dbg(wpa_s, MSG_DEBUG, "Starting delayed sched scan");
215
216 if (wpa_supplicant_req_sched_scan(wpa_s))
217 wpa_supplicant_req_scan(wpa_s, 0, 0);
218 }
219
220
221 static void
222 wpa_supplicant_sched_scan_timeout(void *eloop_ctx, void *timeout_ctx)
223 {
224 struct wpa_supplicant *wpa_s = eloop_ctx;
225
226 wpa_dbg(wpa_s, MSG_DEBUG, "Sched scan timeout - stopping it");
227
228 wpa_s->sched_scan_timed_out = 1;
229 wpa_supplicant_cancel_sched_scan(wpa_s);
230 }
231
232
233 int wpa_supplicant_start_sched_scan(struct wpa_supplicant *wpa_s,
234 struct wpa_driver_scan_params *params,
235 int interval)
236 {
237 int ret;
238
239 wpa_supplicant_notify_scanning(wpa_s, 1);
240 ret = wpa_drv_sched_scan(wpa_s, params, interval * 1000);
241 if (ret)
242 wpa_supplicant_notify_scanning(wpa_s, 0);
243 else
244 wpa_s->sched_scanning = 1;
245
246 return ret;
247 }
248
249
250 int wpa_supplicant_stop_sched_scan(struct wpa_supplicant *wpa_s)
251 {
252 int ret;
253
254 ret = wpa_drv_stop_sched_scan(wpa_s);
255 if (ret) {
256 wpa_dbg(wpa_s, MSG_DEBUG, "stopping sched_scan failed!");
257 /* TODO: what to do if stopping fails? */
258 return -1;
259 }
260
261 return ret;
262 }
263
264
265 static struct wpa_driver_scan_filter *
266 wpa_supplicant_build_filter_ssids(struct wpa_config *conf, size_t *num_ssids)
267 {
268 struct wpa_driver_scan_filter *ssids;
269 struct wpa_ssid *ssid;
270 size_t count;
271
272 *num_ssids = 0;
273 if (!conf->filter_ssids)
274 return NULL;
275
276 for (count = 0, ssid = conf->ssid; ssid; ssid = ssid->next) {
277 if (ssid->ssid && ssid->ssid_len)
278 count++;
279 }
280 if (count == 0)
281 return NULL;
282 ssids = os_zalloc(count * sizeof(struct wpa_driver_scan_filter));
283 if (ssids == NULL)
284 return NULL;
285
286 for (ssid = conf->ssid; ssid; ssid = ssid->next) {
287 if (!ssid->ssid || !ssid->ssid_len)
288 continue;
289 os_memcpy(ssids[*num_ssids].ssid, ssid->ssid, ssid->ssid_len);
290 ssids[*num_ssids].ssid_len = ssid->ssid_len;
291 (*num_ssids)++;
292 }
293
294 return ssids;
295 }
296
297
298 static void wpa_supplicant_optimize_freqs(
299 struct wpa_supplicant *wpa_s, struct wpa_driver_scan_params *params)
300 {
301 #ifdef CONFIG_P2P
302 if (params->freqs == NULL && wpa_s->p2p_in_provisioning &&
303 wpa_s->go_params) {
304 /* Optimize provisioning state scan based on GO information */
305 if (wpa_s->p2p_in_provisioning < 5 &&
306 wpa_s->go_params->freq > 0) {
307 wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only GO "
308 "preferred frequency %d MHz",
309 wpa_s->go_params->freq);
310 params->freqs = os_zalloc(2 * sizeof(int));
311 if (params->freqs)
312 params->freqs[0] = wpa_s->go_params->freq;
313 } else if (wpa_s->p2p_in_provisioning < 8 &&
314 wpa_s->go_params->freq_list[0]) {
315 wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only common "
316 "channels");
317 int_array_concat(&params->freqs,
318 wpa_s->go_params->freq_list);
319 if (params->freqs)
320 int_array_sort_unique(params->freqs);
321 }
322 wpa_s->p2p_in_provisioning++;
323 }
324 #endif /* CONFIG_P2P */
325
326 #ifdef CONFIG_WPS
327 if (params->freqs == NULL && wpa_s->after_wps && wpa_s->wps_freq) {
328 /*
329 * Optimize post-provisioning scan based on channel used
330 * during provisioning.
331 */
332 wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Scan only frequency %u MHz "
333 "that was used during provisioning", wpa_s->wps_freq);
334 params->freqs = os_zalloc(2 * sizeof(int));
335 if (params->freqs)
336 params->freqs[0] = wpa_s->wps_freq;
337 wpa_s->after_wps--;
338 } else if (wpa_s->after_wps)
339 wpa_s->after_wps--;
340
341 if (params->freqs == NULL && wpa_s->known_wps_freq && wpa_s->wps_freq)
342 {
343 /* Optimize provisioning scan based on already known channel */
344 wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Scan only frequency %u MHz",
345 wpa_s->wps_freq);
346 params->freqs = os_zalloc(2 * sizeof(int));
347 if (params->freqs)
348 params->freqs[0] = wpa_s->wps_freq;
349 wpa_s->known_wps_freq = 0; /* only do this once */
350 }
351 #endif /* CONFIG_WPS */
352 }
353
354
355 #ifdef CONFIG_INTERWORKING
356 static void wpas_add_interworking_elements(struct wpa_supplicant *wpa_s,
357 struct wpabuf *buf)
358 {
359 if (wpa_s->conf->interworking == 0)
360 return;
361
362 wpabuf_put_u8(buf, WLAN_EID_EXT_CAPAB);
363 wpabuf_put_u8(buf, 4);
364 wpabuf_put_u8(buf, 0x00);
365 wpabuf_put_u8(buf, 0x00);
366 wpabuf_put_u8(buf, 0x00);
367 wpabuf_put_u8(buf, 0x80); /* Bit 31 - Interworking */
368
369 wpabuf_put_u8(buf, WLAN_EID_INTERWORKING);
370 wpabuf_put_u8(buf, is_zero_ether_addr(wpa_s->conf->hessid) ? 1 :
371 1 + ETH_ALEN);
372 wpabuf_put_u8(buf, wpa_s->conf->access_network_type);
373 /* No Venue Info */
374 if (!is_zero_ether_addr(wpa_s->conf->hessid))
375 wpabuf_put_data(buf, wpa_s->conf->hessid, ETH_ALEN);
376 }
377 #endif /* CONFIG_INTERWORKING */
378
379
380 static struct wpabuf * wpa_supplicant_extra_ies(struct wpa_supplicant *wpa_s)
381 {
382 struct wpabuf *extra_ie = NULL;
383 #ifdef CONFIG_WPS
384 int wps = 0;
385 enum wps_request_type req_type = WPS_REQ_ENROLLEE_INFO;
386 #endif /* CONFIG_WPS */
387
388 #ifdef CONFIG_INTERWORKING
389 if (wpa_s->conf->interworking &&
390 wpabuf_resize(&extra_ie, 100) == 0)
391 wpas_add_interworking_elements(wpa_s, extra_ie);
392 #endif /* CONFIG_INTERWORKING */
393
394 #ifdef CONFIG_WPS
395 wps = wpas_wps_in_use(wpa_s, &req_type);
396
397 if (wps) {
398 struct wpabuf *wps_ie;
399 wps_ie = wps_build_probe_req_ie(wps == 2 ? DEV_PW_PUSHBUTTON :
400 DEV_PW_DEFAULT,
401 &wpa_s->wps->dev,
402 wpa_s->wps->uuid, req_type,
403 0, NULL);
404 if (wps_ie) {
405 if (wpabuf_resize(&extra_ie, wpabuf_len(wps_ie)) == 0)
406 wpabuf_put_buf(extra_ie, wps_ie);
407 wpabuf_free(wps_ie);
408 }
409 }
410
411 #ifdef CONFIG_P2P
412 if (wps) {
413 size_t ielen = p2p_scan_ie_buf_len(wpa_s->global->p2p);
414 if (wpabuf_resize(&extra_ie, ielen) == 0)
415 wpas_p2p_scan_ie(wpa_s, extra_ie);
416 }
417 #endif /* CONFIG_P2P */
418
419 #endif /* CONFIG_WPS */
420
421 #ifdef CONFIG_HS20
422 if (wpa_s->conf->hs20 && wpabuf_resize(&extra_ie, 7) == 0)
423 wpas_hs20_add_indication(extra_ie);
424 #endif /* CONFIG_HS20 */
425
426 return extra_ie;
427 }
428
429
430 #ifdef CONFIG_P2P
431
432 /*
433 * Check whether there are any enabled networks or credentials that could be
434 * used for a non-P2P connection.
435 */
436 static int non_p2p_network_enabled(struct wpa_supplicant *wpa_s)
437 {
438 struct wpa_ssid *ssid;
439
440 for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
441 if (wpas_network_disabled(wpa_s, ssid))
442 continue;
443 if (!ssid->p2p_group)
444 return 1;
445 }
446
447 if (wpa_s->conf->cred && wpa_s->conf->interworking &&
448 wpa_s->conf->auto_interworking)
449 return 1;
450
451 return 0;
452 }
453
454 #endif /* CONFIG_P2P */
455
456
457 static struct hostapd_hw_modes * get_mode(struct hostapd_hw_modes *modes,
458 u16 num_modes,
459 enum hostapd_hw_mode mode)
460 {
461 u16 i;
462
463 for (i = 0; i < num_modes; i++) {
464 if (modes[i].mode == mode)
465 return &modes[i];
466 }
467
468 return NULL;
469 }
470
471
472 static void wpa_setband_scan_freqs_list(struct wpa_supplicant *wpa_s,
473 enum hostapd_hw_mode band,
474 struct wpa_driver_scan_params *params)
475 {
476 /* Include only supported channels for the specified band */
477 struct hostapd_hw_modes *mode;
478 int count, i;
479
480 mode = get_mode(wpa_s->hw.modes, wpa_s->hw.num_modes, band);
481 if (mode == NULL) {
482 /* No channels supported in this band - use empty list */
483 params->freqs = os_zalloc(sizeof(int));
484 return;
485 }
486
487 params->freqs = os_zalloc((mode->num_channels + 1) * sizeof(int));
488 if (params->freqs == NULL)
489 return;
490 for (count = 0, i = 0; i < mode->num_channels; i++) {
491 if (mode->channels[i].flag & HOSTAPD_CHAN_DISABLED)
492 continue;
493 params->freqs[count++] = mode->channels[i].freq;
494 }
495 }
496
497
498 static void wpa_setband_scan_freqs(struct wpa_supplicant *wpa_s,
499 struct wpa_driver_scan_params *params)
500 {
501 if (wpa_s->hw.modes == NULL)
502 return; /* unknown what channels the driver supports */
503 if (params->freqs)
504 return; /* already using a limited channel set */
505 if (wpa_s->setband == WPA_SETBAND_5G)
506 wpa_setband_scan_freqs_list(wpa_s, HOSTAPD_MODE_IEEE80211A,
507 params);
508 else if (wpa_s->setband == WPA_SETBAND_2G)
509 wpa_setband_scan_freqs_list(wpa_s, HOSTAPD_MODE_IEEE80211G,
510 params);
511 }
512
513
514 static void wpa_supplicant_scan(void *eloop_ctx, void *timeout_ctx)
515 {
516 struct wpa_supplicant *wpa_s = eloop_ctx;
517 struct wpa_ssid *ssid;
518 int ret;
519 struct wpabuf *extra_ie = NULL;
520 struct wpa_driver_scan_params params;
521 struct wpa_driver_scan_params *scan_params;
522 size_t max_ssids;
523 enum wpa_states prev_state;
524
525 if (wpa_s->wpa_state == WPA_INTERFACE_DISABLED) {
526 wpa_dbg(wpa_s, MSG_DEBUG, "Skip scan - interface disabled");
527 wpas_p2p_continue_after_scan(wpa_s);
528 return;
529 }
530
531 if (wpa_s->disconnected && wpa_s->scan_req == NORMAL_SCAN_REQ) {
532 wpa_dbg(wpa_s, MSG_DEBUG, "Disconnected - do not scan");
533 wpa_supplicant_set_state(wpa_s, WPA_DISCONNECTED);
534 wpas_p2p_continue_after_scan(wpa_s);
535 return;
536 }
537
538 if (wpa_s->scanning) {
539 /*
540 * If we are already in scanning state, we shall reschedule the
541 * the incoming scan request.
542 */
543 wpa_dbg(wpa_s, MSG_DEBUG, "Already scanning - Reschedule the incoming scan req");
544 wpa_supplicant_req_scan(wpa_s, 1, 0);
545 return;
546 }
547
548 if (wpa_s->external_scan_running) {
549 struct os_reltime now, diff;
550 os_get_reltime(&now);
551 os_reltime_sub(&now, &wpa_s->scan_start_time, &diff);
552 if (diff.sec < 30) {
553 wpa_dbg(wpa_s, MSG_DEBUG, "Externally triggered scan running - Reschedule the incoming scan req");
554 wpa_supplicant_req_scan(wpa_s, 1, 0);
555 return;
556 }
557 }
558
559 if (!wpa_supplicant_enabled_networks(wpa_s) &&
560 wpa_s->scan_req == NORMAL_SCAN_REQ) {
561 wpa_dbg(wpa_s, MSG_DEBUG, "No enabled networks - do not scan");
562 wpa_supplicant_set_state(wpa_s, WPA_INACTIVE);
563 wpas_p2p_continue_after_scan(wpa_s);
564 return;
565 }
566
567 if (wpa_s->conf->ap_scan != 0 &&
568 (wpa_s->drv_flags & WPA_DRIVER_FLAGS_WIRED)) {
569 wpa_dbg(wpa_s, MSG_DEBUG, "Using wired authentication - "
570 "overriding ap_scan configuration");
571 wpa_s->conf->ap_scan = 0;
572 wpas_notify_ap_scan_changed(wpa_s);
573 }
574
575 if (wpa_s->conf->ap_scan == 0) {
576 wpa_supplicant_gen_assoc_event(wpa_s);
577 return;
578 }
579
580 #ifdef CONFIG_P2P
581 if (wpas_p2p_in_progress(wpa_s) || wpas_wpa_is_in_progress(wpa_s, 0)) {
582 if (wpa_s->sta_scan_pending &&
583 wpas_p2p_in_progress(wpa_s) == 2 &&
584 wpa_s->global->p2p_cb_on_scan_complete) {
585 wpa_dbg(wpa_s, MSG_DEBUG, "Process pending station "
586 "mode scan during P2P search");
587 } else {
588 wpa_dbg(wpa_s, MSG_DEBUG, "Delay station mode scan "
589 "while P2P operation is in progress");
590 wpa_s->sta_scan_pending = 1;
591 wpa_supplicant_req_scan(wpa_s, 5, 0);
592 return;
593 }
594 }
595 #endif /* CONFIG_P2P */
596
597 #ifdef CONFIG_GAS
598 if (gas_query_in_progress(wpa_s->gas)) {
599 wpa_dbg(wpa_s, MSG_DEBUG, "Delay scan while GAS query is in progress");
600 wpa_supplicant_req_scan(wpa_s, 1, 0);
601 return;
602 }
603 #endif /* CONFIG_GAS */
604
605 if (wpa_s->conf->ap_scan == 2)
606 max_ssids = 1;
607 else {
608 max_ssids = wpa_s->max_scan_ssids;
609 if (max_ssids > WPAS_MAX_SCAN_SSIDS)
610 max_ssids = WPAS_MAX_SCAN_SSIDS;
611 }
612
613 wpa_s->last_scan_req = wpa_s->scan_req;
614 wpa_s->scan_req = NORMAL_SCAN_REQ;
615
616 os_memset(&params, 0, sizeof(params));
617
618 prev_state = wpa_s->wpa_state;
619 if (wpa_s->wpa_state == WPA_DISCONNECTED ||
620 wpa_s->wpa_state == WPA_INACTIVE)
621 wpa_supplicant_set_state(wpa_s, WPA_SCANNING);
622
623 /*
624 * If autoscan has set its own scanning parameters
625 */
626 if (wpa_s->autoscan_params != NULL) {
627 scan_params = wpa_s->autoscan_params;
628 goto scan;
629 }
630
631 if (wpa_s->last_scan_req != MANUAL_SCAN_REQ &&
632 wpa_s->connect_without_scan) {
633 for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
634 if (ssid == wpa_s->connect_without_scan)
635 break;
636 }
637 wpa_s->connect_without_scan = NULL;
638 if (ssid) {
639 wpa_printf(MSG_DEBUG, "Start a pre-selected network "
640 "without scan step");
641 wpa_supplicant_associate(wpa_s, NULL, ssid);
642 return;
643 }
644 }
645
646 #ifdef CONFIG_P2P
647 if ((wpa_s->p2p_in_provisioning || wpa_s->show_group_started) &&
648 wpa_s->go_params) {
649 wpa_printf(MSG_DEBUG, "P2P: Use specific SSID for scan during P2P group formation (p2p_in_provisioning=%d show_group_started=%d)",
650 wpa_s->p2p_in_provisioning,
651 wpa_s->show_group_started);
652 params.ssids[0].ssid = wpa_s->go_params->ssid;
653 params.ssids[0].ssid_len = wpa_s->go_params->ssid_len;
654 params.num_ssids = 1;
655 goto ssid_list_set;
656 }
657 #endif /* CONFIG_P2P */
658
659 /* Find the starting point from which to continue scanning */
660 ssid = wpa_s->conf->ssid;
661 if (wpa_s->prev_scan_ssid != WILDCARD_SSID_SCAN) {
662 while (ssid) {
663 if (ssid == wpa_s->prev_scan_ssid) {
664 ssid = ssid->next;
665 break;
666 }
667 ssid = ssid->next;
668 }
669 }
670
671 if (wpa_s->last_scan_req != MANUAL_SCAN_REQ &&
672 wpa_s->conf->ap_scan == 2) {
673 wpa_s->connect_without_scan = NULL;
674 wpa_s->prev_scan_wildcard = 0;
675 wpa_supplicant_assoc_try(wpa_s, ssid);
676 return;
677 } else if (wpa_s->conf->ap_scan == 2) {
678 /*
679 * User-initiated scan request in ap_scan == 2; scan with
680 * wildcard SSID.
681 */
682 ssid = NULL;
683 } else {
684 struct wpa_ssid *start = ssid, *tssid;
685 int freqs_set = 0;
686 if (ssid == NULL && max_ssids > 1)
687 ssid = wpa_s->conf->ssid;
688 while (ssid) {
689 if (!wpas_network_disabled(wpa_s, ssid) &&
690 ssid->scan_ssid) {
691 wpa_hexdump_ascii(MSG_DEBUG, "Scan SSID",
692 ssid->ssid, ssid->ssid_len);
693 params.ssids[params.num_ssids].ssid =
694 ssid->ssid;
695 params.ssids[params.num_ssids].ssid_len =
696 ssid->ssid_len;
697 params.num_ssids++;
698 if (params.num_ssids + 1 >= max_ssids)
699 break;
700 }
701 ssid = ssid->next;
702 if (ssid == start)
703 break;
704 if (ssid == NULL && max_ssids > 1 &&
705 start != wpa_s->conf->ssid)
706 ssid = wpa_s->conf->ssid;
707 }
708
709 for (tssid = wpa_s->conf->ssid; tssid; tssid = tssid->next) {
710 if (wpas_network_disabled(wpa_s, tssid))
711 continue;
712 if ((params.freqs || !freqs_set) && tssid->scan_freq) {
713 int_array_concat(&params.freqs,
714 tssid->scan_freq);
715 } else {
716 os_free(params.freqs);
717 params.freqs = NULL;
718 }
719 freqs_set = 1;
720 }
721 int_array_sort_unique(params.freqs);
722 }
723
724 if (ssid && max_ssids == 1) {
725 /*
726 * If the driver is limited to 1 SSID at a time interleave
727 * wildcard SSID scans with specific SSID scans to avoid
728 * waiting a long time for a wildcard scan.
729 */
730 if (!wpa_s->prev_scan_wildcard) {
731 params.ssids[0].ssid = NULL;
732 params.ssids[0].ssid_len = 0;
733 wpa_s->prev_scan_wildcard = 1;
734 wpa_dbg(wpa_s, MSG_DEBUG, "Starting AP scan for "
735 "wildcard SSID (Interleave with specific)");
736 } else {
737 wpa_s->prev_scan_ssid = ssid;
738 wpa_s->prev_scan_wildcard = 0;
739 wpa_dbg(wpa_s, MSG_DEBUG,
740 "Starting AP scan for specific SSID: %s",
741 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
742 }
743 } else if (ssid) {
744 /* max_ssids > 1 */
745
746 wpa_s->prev_scan_ssid = ssid;
747 wpa_dbg(wpa_s, MSG_DEBUG, "Include wildcard SSID in "
748 "the scan request");
749 params.num_ssids++;
750 } else if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
751 wpa_s->manual_scan_passive && params.num_ssids == 0) {
752 wpa_dbg(wpa_s, MSG_DEBUG, "Use passive scan based on manual request");
753 } else {
754 wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
755 params.num_ssids++;
756 wpa_dbg(wpa_s, MSG_DEBUG, "Starting AP scan for wildcard "
757 "SSID");
758 }
759 #ifdef CONFIG_P2P
760 ssid_list_set:
761 #endif /* CONFIG_P2P */
762
763 wpa_supplicant_optimize_freqs(wpa_s, &params);
764 extra_ie = wpa_supplicant_extra_ies(wpa_s);
765
766 if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
767 wpa_s->manual_scan_only_new)
768 params.only_new_results = 1;
769
770 if (wpa_s->last_scan_req == MANUAL_SCAN_REQ && params.freqs == NULL &&
771 wpa_s->manual_scan_freqs) {
772 wpa_dbg(wpa_s, MSG_DEBUG, "Limit manual scan to specified channels");
773 params.freqs = wpa_s->manual_scan_freqs;
774 wpa_s->manual_scan_freqs = NULL;
775 }
776
777 if (params.freqs == NULL && wpa_s->next_scan_freqs) {
778 wpa_dbg(wpa_s, MSG_DEBUG, "Optimize scan based on previously "
779 "generated frequency list");
780 params.freqs = wpa_s->next_scan_freqs;
781 } else
782 os_free(wpa_s->next_scan_freqs);
783 wpa_s->next_scan_freqs = NULL;
784 wpa_setband_scan_freqs(wpa_s, &params);
785
786 /* See if user specified frequencies. If so, scan only those. */
787 if (wpa_s->conf->freq_list && !params.freqs) {
788 wpa_dbg(wpa_s, MSG_DEBUG,
789 "Optimize scan based on conf->freq_list");
790 int_array_concat(&params.freqs, wpa_s->conf->freq_list);
791 }
792
793 /* Use current associated channel? */
794 if (wpa_s->conf->scan_cur_freq && !params.freqs) {
795 unsigned int num = wpa_s->num_multichan_concurrent;
796
797 params.freqs = os_calloc(num + 1, sizeof(int));
798 if (params.freqs) {
799 num = get_shared_radio_freqs(wpa_s, params.freqs, num);
800 if (num > 0) {
801 wpa_dbg(wpa_s, MSG_DEBUG, "Scan only the "
802 "current operating channels since "
803 "scan_cur_freq is enabled");
804 } else {
805 os_free(params.freqs);
806 params.freqs = NULL;
807 }
808 }
809 }
810
811 params.filter_ssids = wpa_supplicant_build_filter_ssids(
812 wpa_s->conf, &params.num_filter_ssids);
813 if (extra_ie) {
814 params.extra_ies = wpabuf_head(extra_ie);
815 params.extra_ies_len = wpabuf_len(extra_ie);
816 }
817
818 #ifdef CONFIG_P2P
819 if (wpa_s->p2p_in_provisioning ||
820 (wpa_s->show_group_started && wpa_s->go_params)) {
821 /*
822 * The interface may not yet be in P2P mode, so we have to
823 * explicitly request P2P probe to disable CCK rates.
824 */
825 params.p2p_probe = 1;
826 }
827 #endif /* CONFIG_P2P */
828
829 scan_params = &params;
830
831 scan:
832 #ifdef CONFIG_P2P
833 /*
834 * If the driver does not support multi-channel concurrency and a
835 * virtual interface that shares the same radio with the wpa_s interface
836 * is operating there may not be need to scan other channels apart from
837 * the current operating channel on the other virtual interface. Filter
838 * out other channels in case we are trying to find a connection for a
839 * station interface when we are not configured to prefer station
840 * connection and a concurrent operation is already in process.
841 */
842 if (wpa_s->scan_for_connection &&
843 wpa_s->last_scan_req == NORMAL_SCAN_REQ &&
844 !scan_params->freqs && !params.freqs &&
845 wpas_is_p2p_prioritized(wpa_s) &&
846 wpa_s->p2p_group_interface == NOT_P2P_GROUP_INTERFACE &&
847 non_p2p_network_enabled(wpa_s)) {
848 unsigned int num = wpa_s->num_multichan_concurrent;
849
850 params.freqs = os_calloc(num + 1, sizeof(int));
851 if (params.freqs) {
852 num = get_shared_radio_freqs(wpa_s, params.freqs, num);
853 if (num > 0 && num == wpa_s->num_multichan_concurrent) {
854 wpa_dbg(wpa_s, MSG_DEBUG, "Scan only the current operating channels since all channels are already used");
855 } else {
856 os_free(params.freqs);
857 params.freqs = NULL;
858 }
859 }
860 }
861 #endif /* CONFIG_P2P */
862
863 ret = wpa_supplicant_trigger_scan(wpa_s, scan_params);
864
865 if (ret && wpa_s->last_scan_req == MANUAL_SCAN_REQ && params.freqs &&
866 !wpa_s->manual_scan_freqs) {
867 /* Restore manual_scan_freqs for the next attempt */
868 wpa_s->manual_scan_freqs = params.freqs;
869 params.freqs = NULL;
870 }
871
872 wpabuf_free(extra_ie);
873 os_free(params.freqs);
874 os_free(params.filter_ssids);
875
876 if (ret) {
877 wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate AP scan");
878 if (prev_state != wpa_s->wpa_state)
879 wpa_supplicant_set_state(wpa_s, prev_state);
880 /* Restore scan_req since we will try to scan again */
881 wpa_s->scan_req = wpa_s->last_scan_req;
882 wpa_supplicant_req_scan(wpa_s, 1, 0);
883 } else {
884 wpa_s->scan_for_connection = 0;
885 }
886 }
887
888
889 void wpa_supplicant_update_scan_int(struct wpa_supplicant *wpa_s, int sec)
890 {
891 struct os_reltime remaining, new_int;
892 int cancelled;
893
894 cancelled = eloop_cancel_timeout_one(wpa_supplicant_scan, wpa_s, NULL,
895 &remaining);
896
897 new_int.sec = sec;
898 new_int.usec = 0;
899 if (cancelled && os_reltime_before(&remaining, &new_int)) {
900 new_int.sec = remaining.sec;
901 new_int.usec = remaining.usec;
902 }
903
904 if (cancelled) {
905 eloop_register_timeout(new_int.sec, new_int.usec,
906 wpa_supplicant_scan, wpa_s, NULL);
907 }
908 wpa_s->scan_interval = sec;
909 }
910
911
912 /**
913 * wpa_supplicant_req_scan - Schedule a scan for neighboring access points
914 * @wpa_s: Pointer to wpa_supplicant data
915 * @sec: Number of seconds after which to scan
916 * @usec: Number of microseconds after which to scan
917 *
918 * This function is used to schedule a scan for neighboring access points after
919 * the specified time.
920 */
921 void wpa_supplicant_req_scan(struct wpa_supplicant *wpa_s, int sec, int usec)
922 {
923 if (eloop_deplete_timeout(sec, usec, wpa_supplicant_scan, wpa_s, NULL))
924 {
925 wpa_dbg(wpa_s, MSG_DEBUG, "Rescheduling scan request: %d sec %d usec",
926 sec, usec);
927 return;
928 }
929
930 wpa_dbg(wpa_s, MSG_DEBUG, "Setting scan request: %d sec %d usec",
931 sec, usec);
932 eloop_cancel_timeout(wpa_supplicant_scan, wpa_s, NULL);
933 eloop_register_timeout(sec, usec, wpa_supplicant_scan, wpa_s, NULL);
934 }
935
936
937 /**
938 * wpa_supplicant_delayed_sched_scan - Request a delayed scheduled scan
939 * @wpa_s: Pointer to wpa_supplicant data
940 * @sec: Number of seconds after which to scan
941 * @usec: Number of microseconds after which to scan
942 * Returns: 0 on success or -1 otherwise
943 *
944 * This function is used to schedule periodic scans for neighboring
945 * access points after the specified time.
946 */
947 int wpa_supplicant_delayed_sched_scan(struct wpa_supplicant *wpa_s,
948 int sec, int usec)
949 {
950 if (!wpa_s->sched_scan_supported)
951 return -1;
952
953 eloop_register_timeout(sec, usec,
954 wpa_supplicant_delayed_sched_scan_timeout,
955 wpa_s, NULL);
956
957 return 0;
958 }
959
960
961 /**
962 * wpa_supplicant_req_sched_scan - Start a periodic scheduled scan
963 * @wpa_s: Pointer to wpa_supplicant data
964 * Returns: 0 is sched_scan was started or -1 otherwise
965 *
966 * This function is used to schedule periodic scans for neighboring
967 * access points repeating the scan continuously.
968 */
969 int wpa_supplicant_req_sched_scan(struct wpa_supplicant *wpa_s)
970 {
971 struct wpa_driver_scan_params params;
972 struct wpa_driver_scan_params *scan_params;
973 enum wpa_states prev_state;
974 struct wpa_ssid *ssid = NULL;
975 struct wpabuf *extra_ie = NULL;
976 int ret;
977 unsigned int max_sched_scan_ssids;
978 int wildcard = 0;
979 int need_ssids;
980
981 if (!wpa_s->sched_scan_supported)
982 return -1;
983
984 if (wpa_s->max_sched_scan_ssids > WPAS_MAX_SCAN_SSIDS)
985 max_sched_scan_ssids = WPAS_MAX_SCAN_SSIDS;
986 else
987 max_sched_scan_ssids = wpa_s->max_sched_scan_ssids;
988 if (max_sched_scan_ssids < 1 || wpa_s->conf->disable_scan_offload)
989 return -1;
990
991 if (wpa_s->sched_scanning) {
992 wpa_dbg(wpa_s, MSG_DEBUG, "Already sched scanning");
993 return 0;
994 }
995
996 need_ssids = 0;
997 for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
998 if (!wpas_network_disabled(wpa_s, ssid) && !ssid->scan_ssid) {
999 /* Use wildcard SSID to find this network */
1000 wildcard = 1;
1001 } else if (!wpas_network_disabled(wpa_s, ssid) &&
1002 ssid->ssid_len)
1003 need_ssids++;
1004
1005 #ifdef CONFIG_WPS
1006 if (!wpas_network_disabled(wpa_s, ssid) &&
1007 ssid->key_mgmt == WPA_KEY_MGMT_WPS) {
1008 /*
1009 * Normal scan is more reliable and faster for WPS
1010 * operations and since these are for short periods of
1011 * time, the benefit of trying to use sched_scan would
1012 * be limited.
1013 */
1014 wpa_dbg(wpa_s, MSG_DEBUG, "Use normal scan instead of "
1015 "sched_scan for WPS");
1016 return -1;
1017 }
1018 #endif /* CONFIG_WPS */
1019 }
1020 if (wildcard)
1021 need_ssids++;
1022
1023 if (wpa_s->normal_scans < 3 &&
1024 (need_ssids <= wpa_s->max_scan_ssids ||
1025 wpa_s->max_scan_ssids >= (int) max_sched_scan_ssids)) {
1026 /*
1027 * When normal scan can speed up operations, use that for the
1028 * first operations before starting the sched_scan to allow
1029 * user space sleep more. We do this only if the normal scan
1030 * has functionality that is suitable for this or if the
1031 * sched_scan does not have better support for multiple SSIDs.
1032 */
1033 wpa_dbg(wpa_s, MSG_DEBUG, "Use normal scan instead of "
1034 "sched_scan for initial scans (normal_scans=%d)",
1035 wpa_s->normal_scans);
1036 return -1;
1037 }
1038
1039 os_memset(&params, 0, sizeof(params));
1040
1041 /* If we can't allocate space for the filters, we just don't filter */
1042 params.filter_ssids = os_zalloc(wpa_s->max_match_sets *
1043 sizeof(struct wpa_driver_scan_filter));
1044
1045 prev_state = wpa_s->wpa_state;
1046 if (wpa_s->wpa_state == WPA_DISCONNECTED ||
1047 wpa_s->wpa_state == WPA_INACTIVE)
1048 wpa_supplicant_set_state(wpa_s, WPA_SCANNING);
1049
1050 if (wpa_s->autoscan_params != NULL) {
1051 scan_params = wpa_s->autoscan_params;
1052 goto scan;
1053 }
1054
1055 /* Find the starting point from which to continue scanning */
1056 ssid = wpa_s->conf->ssid;
1057 if (wpa_s->prev_sched_ssid) {
1058 while (ssid) {
1059 if (ssid == wpa_s->prev_sched_ssid) {
1060 ssid = ssid->next;
1061 break;
1062 }
1063 ssid = ssid->next;
1064 }
1065 }
1066
1067 if (!ssid || !wpa_s->prev_sched_ssid) {
1068 wpa_dbg(wpa_s, MSG_DEBUG, "Beginning of SSID list");
1069 if (wpa_s->conf->sched_scan_interval)
1070 wpa_s->sched_scan_interval =
1071 wpa_s->conf->sched_scan_interval;
1072 if (wpa_s->sched_scan_interval == 0)
1073 wpa_s->sched_scan_interval = 10;
1074 wpa_s->sched_scan_timeout = max_sched_scan_ssids * 2;
1075 wpa_s->first_sched_scan = 1;
1076 ssid = wpa_s->conf->ssid;
1077 wpa_s->prev_sched_ssid = ssid;
1078 }
1079
1080 if (wildcard) {
1081 wpa_dbg(wpa_s, MSG_DEBUG, "Add wildcard SSID to sched_scan");
1082 params.num_ssids++;
1083 }
1084
1085 while (ssid) {
1086 if (wpas_network_disabled(wpa_s, ssid))
1087 goto next;
1088
1089 if (params.num_filter_ssids < wpa_s->max_match_sets &&
1090 params.filter_ssids && ssid->ssid && ssid->ssid_len) {
1091 wpa_dbg(wpa_s, MSG_DEBUG, "add to filter ssid: %s",
1092 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
1093 os_memcpy(params.filter_ssids[params.num_filter_ssids].ssid,
1094 ssid->ssid, ssid->ssid_len);
1095 params.filter_ssids[params.num_filter_ssids].ssid_len =
1096 ssid->ssid_len;
1097 params.num_filter_ssids++;
1098 } else if (params.filter_ssids && ssid->ssid && ssid->ssid_len)
1099 {
1100 wpa_dbg(wpa_s, MSG_DEBUG, "Not enough room for SSID "
1101 "filter for sched_scan - drop filter");
1102 os_free(params.filter_ssids);
1103 params.filter_ssids = NULL;
1104 params.num_filter_ssids = 0;
1105 }
1106
1107 if (ssid->scan_ssid && ssid->ssid && ssid->ssid_len) {
1108 if (params.num_ssids == max_sched_scan_ssids)
1109 break; /* only room for broadcast SSID */
1110 wpa_dbg(wpa_s, MSG_DEBUG,
1111 "add to active scan ssid: %s",
1112 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
1113 params.ssids[params.num_ssids].ssid =
1114 ssid->ssid;
1115 params.ssids[params.num_ssids].ssid_len =
1116 ssid->ssid_len;
1117 params.num_ssids++;
1118 if (params.num_ssids >= max_sched_scan_ssids) {
1119 wpa_s->prev_sched_ssid = ssid;
1120 do {
1121 ssid = ssid->next;
1122 } while (ssid &&
1123 (wpas_network_disabled(wpa_s, ssid) ||
1124 !ssid->scan_ssid));
1125 break;
1126 }
1127 }
1128
1129 next:
1130 wpa_s->prev_sched_ssid = ssid;
1131 ssid = ssid->next;
1132 }
1133
1134 if (params.num_filter_ssids == 0) {
1135 os_free(params.filter_ssids);
1136 params.filter_ssids = NULL;
1137 }
1138
1139 extra_ie = wpa_supplicant_extra_ies(wpa_s);
1140 if (extra_ie) {
1141 params.extra_ies = wpabuf_head(extra_ie);
1142 params.extra_ies_len = wpabuf_len(extra_ie);
1143 }
1144
1145 scan_params = &params;
1146
1147 scan:
1148 if (ssid || !wpa_s->first_sched_scan) {
1149 wpa_dbg(wpa_s, MSG_DEBUG,
1150 "Starting sched scan: interval %d timeout %d",
1151 wpa_s->sched_scan_interval, wpa_s->sched_scan_timeout);
1152 } else {
1153 wpa_dbg(wpa_s, MSG_DEBUG,
1154 "Starting sched scan: interval %d (no timeout)",
1155 wpa_s->sched_scan_interval);
1156 }
1157
1158 wpa_setband_scan_freqs(wpa_s, scan_params);
1159
1160 ret = wpa_supplicant_start_sched_scan(wpa_s, scan_params,
1161 wpa_s->sched_scan_interval);
1162 wpabuf_free(extra_ie);
1163 os_free(params.filter_ssids);
1164 if (ret) {
1165 wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate sched scan");
1166 if (prev_state != wpa_s->wpa_state)
1167 wpa_supplicant_set_state(wpa_s, prev_state);
1168 return ret;
1169 }
1170
1171 /* If we have more SSIDs to scan, add a timeout so we scan them too */
1172 if (ssid || !wpa_s->first_sched_scan) {
1173 wpa_s->sched_scan_timed_out = 0;
1174 eloop_register_timeout(wpa_s->sched_scan_timeout, 0,
1175 wpa_supplicant_sched_scan_timeout,
1176 wpa_s, NULL);
1177 wpa_s->first_sched_scan = 0;
1178 wpa_s->sched_scan_timeout /= 2;
1179 wpa_s->sched_scan_interval *= 2;
1180 if (wpa_s->sched_scan_timeout < wpa_s->sched_scan_interval) {
1181 wpa_s->sched_scan_interval = 10;
1182 wpa_s->sched_scan_timeout = max_sched_scan_ssids * 2;
1183 }
1184 }
1185
1186 /* If there is no more ssids, start next time from the beginning */
1187 if (!ssid)
1188 wpa_s->prev_sched_ssid = NULL;
1189
1190 return 0;
1191 }
1192
1193
1194 /**
1195 * wpa_supplicant_cancel_scan - Cancel a scheduled scan request
1196 * @wpa_s: Pointer to wpa_supplicant data
1197 *
1198 * This function is used to cancel a scan request scheduled with
1199 * wpa_supplicant_req_scan().
1200 */
1201 void wpa_supplicant_cancel_scan(struct wpa_supplicant *wpa_s)
1202 {
1203 wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling scan request");
1204 eloop_cancel_timeout(wpa_supplicant_scan, wpa_s, NULL);
1205 wpas_p2p_continue_after_scan(wpa_s);
1206 }
1207
1208
1209 /**
1210 * wpa_supplicant_cancel_delayed_sched_scan - Stop a delayed scheduled scan
1211 * @wpa_s: Pointer to wpa_supplicant data
1212 *
1213 * This function is used to stop a delayed scheduled scan.
1214 */
1215 void wpa_supplicant_cancel_delayed_sched_scan(struct wpa_supplicant *wpa_s)
1216 {
1217 if (!wpa_s->sched_scan_supported)
1218 return;
1219
1220 wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling delayed sched scan");
1221 eloop_cancel_timeout(wpa_supplicant_delayed_sched_scan_timeout,
1222 wpa_s, NULL);
1223 }
1224
1225
1226 /**
1227 * wpa_supplicant_cancel_sched_scan - Stop running scheduled scans
1228 * @wpa_s: Pointer to wpa_supplicant data
1229 *
1230 * This function is used to stop a periodic scheduled scan.
1231 */
1232 void wpa_supplicant_cancel_sched_scan(struct wpa_supplicant *wpa_s)
1233 {
1234 if (!wpa_s->sched_scanning)
1235 return;
1236
1237 wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling sched scan");
1238 eloop_cancel_timeout(wpa_supplicant_sched_scan_timeout, wpa_s, NULL);
1239 wpa_supplicant_stop_sched_scan(wpa_s);
1240 }
1241
1242
1243 /**
1244 * wpa_supplicant_notify_scanning - Indicate possible scan state change
1245 * @wpa_s: Pointer to wpa_supplicant data
1246 * @scanning: Whether scanning is currently in progress
1247 *
1248 * This function is to generate scanning notifycations. It is called whenever
1249 * there may have been a change in scanning (scan started, completed, stopped).
1250 * wpas_notify_scanning() is called whenever the scanning state changed from the
1251 * previously notified state.
1252 */
1253 void wpa_supplicant_notify_scanning(struct wpa_supplicant *wpa_s,
1254 int scanning)
1255 {
1256 if (wpa_s->scanning != scanning) {
1257 wpa_s->scanning = scanning;
1258 wpas_notify_scanning(wpa_s);
1259 }
1260 }
1261
1262
1263 static int wpa_scan_get_max_rate(const struct wpa_scan_res *res)
1264 {
1265 int rate = 0;
1266 const u8 *ie;
1267 int i;
1268
1269 ie = wpa_scan_get_ie(res, WLAN_EID_SUPP_RATES);
1270 for (i = 0; ie && i < ie[1]; i++) {
1271 if ((ie[i + 2] & 0x7f) > rate)
1272 rate = ie[i + 2] & 0x7f;
1273 }
1274
1275 ie = wpa_scan_get_ie(res, WLAN_EID_EXT_SUPP_RATES);
1276 for (i = 0; ie && i < ie[1]; i++) {
1277 if ((ie[i + 2] & 0x7f) > rate)
1278 rate = ie[i + 2] & 0x7f;
1279 }
1280
1281 return rate;
1282 }
1283
1284
1285 /**
1286 * wpa_scan_get_ie - Fetch a specified information element from a scan result
1287 * @res: Scan result entry
1288 * @ie: Information element identitifier (WLAN_EID_*)
1289 * Returns: Pointer to the information element (id field) or %NULL if not found
1290 *
1291 * This function returns the first matching information element in the scan
1292 * result.
1293 */
1294 const u8 * wpa_scan_get_ie(const struct wpa_scan_res *res, u8 ie)
1295 {
1296 const u8 *end, *pos;
1297
1298 pos = (const u8 *) (res + 1);
1299 end = pos + res->ie_len;
1300
1301 while (pos + 1 < end) {
1302 if (pos + 2 + pos[1] > end)
1303 break;
1304 if (pos[0] == ie)
1305 return pos;
1306 pos += 2 + pos[1];
1307 }
1308
1309 return NULL;
1310 }
1311
1312
1313 /**
1314 * wpa_scan_get_vendor_ie - Fetch vendor information element from a scan result
1315 * @res: Scan result entry
1316 * @vendor_type: Vendor type (four octets starting the IE payload)
1317 * Returns: Pointer to the information element (id field) or %NULL if not found
1318 *
1319 * This function returns the first matching information element in the scan
1320 * result.
1321 */
1322 const u8 * wpa_scan_get_vendor_ie(const struct wpa_scan_res *res,
1323 u32 vendor_type)
1324 {
1325 const u8 *end, *pos;
1326
1327 pos = (const u8 *) (res + 1);
1328 end = pos + res->ie_len;
1329
1330 while (pos + 1 < end) {
1331 if (pos + 2 + pos[1] > end)
1332 break;
1333 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1334 vendor_type == WPA_GET_BE32(&pos[2]))
1335 return pos;
1336 pos += 2 + pos[1];
1337 }
1338
1339 return NULL;
1340 }
1341
1342
1343 /**
1344 * wpa_scan_get_vendor_ie_beacon - Fetch vendor information from a scan result
1345 * @res: Scan result entry
1346 * @vendor_type: Vendor type (four octets starting the IE payload)
1347 * Returns: Pointer to the information element (id field) or %NULL if not found
1348 *
1349 * This function returns the first matching information element in the scan
1350 * result.
1351 *
1352 * This function is like wpa_scan_get_vendor_ie(), but uses IE buffer only
1353 * from Beacon frames instead of either Beacon or Probe Response frames.
1354 */
1355 const u8 * wpa_scan_get_vendor_ie_beacon(const struct wpa_scan_res *res,
1356 u32 vendor_type)
1357 {
1358 const u8 *end, *pos;
1359
1360 if (res->beacon_ie_len == 0)
1361 return NULL;
1362
1363 pos = (const u8 *) (res + 1);
1364 pos += res->ie_len;
1365 end = pos + res->beacon_ie_len;
1366
1367 while (pos + 1 < end) {
1368 if (pos + 2 + pos[1] > end)
1369 break;
1370 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1371 vendor_type == WPA_GET_BE32(&pos[2]))
1372 return pos;
1373 pos += 2 + pos[1];
1374 }
1375
1376 return NULL;
1377 }
1378
1379
1380 /**
1381 * wpa_scan_get_vendor_ie_multi - Fetch vendor IE data from a scan result
1382 * @res: Scan result entry
1383 * @vendor_type: Vendor type (four octets starting the IE payload)
1384 * Returns: Pointer to the information element payload or %NULL if not found
1385 *
1386 * This function returns concatenated payload of possibly fragmented vendor
1387 * specific information elements in the scan result. The caller is responsible
1388 * for freeing the returned buffer.
1389 */
1390 struct wpabuf * wpa_scan_get_vendor_ie_multi(const struct wpa_scan_res *res,
1391 u32 vendor_type)
1392 {
1393 struct wpabuf *buf;
1394 const u8 *end, *pos;
1395
1396 buf = wpabuf_alloc(res->ie_len);
1397 if (buf == NULL)
1398 return NULL;
1399
1400 pos = (const u8 *) (res + 1);
1401 end = pos + res->ie_len;
1402
1403 while (pos + 1 < end) {
1404 if (pos + 2 + pos[1] > end)
1405 break;
1406 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1407 vendor_type == WPA_GET_BE32(&pos[2]))
1408 wpabuf_put_data(buf, pos + 2 + 4, pos[1] - 4);
1409 pos += 2 + pos[1];
1410 }
1411
1412 if (wpabuf_len(buf) == 0) {
1413 wpabuf_free(buf);
1414 buf = NULL;
1415 }
1416
1417 return buf;
1418 }
1419
1420
1421 /*
1422 * Channels with a great SNR can operate at full rate. What is a great SNR?
1423 * This doc https://supportforums.cisco.com/docs/DOC-12954 says, "the general
1424 * rule of thumb is that any SNR above 20 is good." This one
1425 * http://www.cisco.com/en/US/tech/tk722/tk809/technologies_q_and_a_item09186a00805e9a96.shtml#qa23
1426 * recommends 25 as a minimum SNR for 54 Mbps data rate. 30 is chosen here as a
1427 * conservative value.
1428 */
1429 #define GREAT_SNR 30
1430
1431 /* Compare function for sorting scan results. Return >0 if @b is considered
1432 * better. */
1433 static int wpa_scan_result_compar(const void *a, const void *b)
1434 {
1435 #define IS_5GHZ(n) (n > 4000)
1436 #define MIN(a,b) a < b ? a : b
1437 struct wpa_scan_res **_wa = (void *) a;
1438 struct wpa_scan_res **_wb = (void *) b;
1439 struct wpa_scan_res *wa = *_wa;
1440 struct wpa_scan_res *wb = *_wb;
1441 int wpa_a, wpa_b, maxrate_a, maxrate_b;
1442 int snr_a, snr_b;
1443
1444 /* WPA/WPA2 support preferred */
1445 wpa_a = wpa_scan_get_vendor_ie(wa, WPA_IE_VENDOR_TYPE) != NULL ||
1446 wpa_scan_get_ie(wa, WLAN_EID_RSN) != NULL;
1447 wpa_b = wpa_scan_get_vendor_ie(wb, WPA_IE_VENDOR_TYPE) != NULL ||
1448 wpa_scan_get_ie(wb, WLAN_EID_RSN) != NULL;
1449
1450 if (wpa_b && !wpa_a)
1451 return 1;
1452 if (!wpa_b && wpa_a)
1453 return -1;
1454
1455 /* privacy support preferred */
1456 if ((wa->caps & IEEE80211_CAP_PRIVACY) == 0 &&
1457 (wb->caps & IEEE80211_CAP_PRIVACY))
1458 return 1;
1459 if ((wa->caps & IEEE80211_CAP_PRIVACY) &&
1460 (wb->caps & IEEE80211_CAP_PRIVACY) == 0)
1461 return -1;
1462
1463 if ((wa->flags & wb->flags & WPA_SCAN_LEVEL_DBM) &&
1464 !((wa->flags | wb->flags) & WPA_SCAN_NOISE_INVALID)) {
1465 snr_a = MIN(wa->level - wa->noise, GREAT_SNR);
1466 snr_b = MIN(wb->level - wb->noise, GREAT_SNR);
1467 } else {
1468 /* Not suitable information to calculate SNR, so use level */
1469 snr_a = wa->level;
1470 snr_b = wb->level;
1471 }
1472
1473 /* best/max rate preferred if SNR close enough */
1474 if ((snr_a && snr_b && abs(snr_b - snr_a) < 5) ||
1475 (wa->qual && wb->qual && abs(wb->qual - wa->qual) < 10)) {
1476 maxrate_a = wpa_scan_get_max_rate(wa);
1477 maxrate_b = wpa_scan_get_max_rate(wb);
1478 if (maxrate_a != maxrate_b)
1479 return maxrate_b - maxrate_a;
1480 if (IS_5GHZ(wa->freq) ^ IS_5GHZ(wb->freq))
1481 return IS_5GHZ(wa->freq) ? -1 : 1;
1482 }
1483
1484 /* use freq for channel preference */
1485
1486 /* all things being equal, use SNR; if SNRs are
1487 * identical, use quality values since some drivers may only report
1488 * that value and leave the signal level zero */
1489 if (snr_b == snr_a)
1490 return wb->qual - wa->qual;
1491 return snr_b - snr_a;
1492 #undef MIN
1493 #undef IS_5GHZ
1494 }
1495
1496
1497 #ifdef CONFIG_WPS
1498 /* Compare function for sorting scan results when searching a WPS AP for
1499 * provisioning. Return >0 if @b is considered better. */
1500 static int wpa_scan_result_wps_compar(const void *a, const void *b)
1501 {
1502 struct wpa_scan_res **_wa = (void *) a;
1503 struct wpa_scan_res **_wb = (void *) b;
1504 struct wpa_scan_res *wa = *_wa;
1505 struct wpa_scan_res *wb = *_wb;
1506 int uses_wps_a, uses_wps_b;
1507 struct wpabuf *wps_a, *wps_b;
1508 int res;
1509
1510 /* Optimization - check WPS IE existence before allocated memory and
1511 * doing full reassembly. */
1512 uses_wps_a = wpa_scan_get_vendor_ie(wa, WPS_IE_VENDOR_TYPE) != NULL;
1513 uses_wps_b = wpa_scan_get_vendor_ie(wb, WPS_IE_VENDOR_TYPE) != NULL;
1514 if (uses_wps_a && !uses_wps_b)
1515 return -1;
1516 if (!uses_wps_a && uses_wps_b)
1517 return 1;
1518
1519 if (uses_wps_a && uses_wps_b) {
1520 wps_a = wpa_scan_get_vendor_ie_multi(wa, WPS_IE_VENDOR_TYPE);
1521 wps_b = wpa_scan_get_vendor_ie_multi(wb, WPS_IE_VENDOR_TYPE);
1522 res = wps_ap_priority_compar(wps_a, wps_b);
1523 wpabuf_free(wps_a);
1524 wpabuf_free(wps_b);
1525 if (res)
1526 return res;
1527 }
1528
1529 /*
1530 * Do not use current AP security policy as a sorting criteria during
1531 * WPS provisioning step since the AP may get reconfigured at the
1532 * completion of provisioning.
1533 */
1534
1535 /* all things being equal, use signal level; if signal levels are
1536 * identical, use quality values since some drivers may only report
1537 * that value and leave the signal level zero */
1538 if (wb->level == wa->level)
1539 return wb->qual - wa->qual;
1540 return wb->level - wa->level;
1541 }
1542 #endif /* CONFIG_WPS */
1543
1544
1545 static void dump_scan_res(struct wpa_scan_results *scan_res)
1546 {
1547 #ifndef CONFIG_NO_STDOUT_DEBUG
1548 size_t i;
1549
1550 if (scan_res->res == NULL || scan_res->num == 0)
1551 return;
1552
1553 wpa_printf(MSG_EXCESSIVE, "Sorted scan results");
1554
1555 for (i = 0; i < scan_res->num; i++) {
1556 struct wpa_scan_res *r = scan_res->res[i];
1557 u8 *pos;
1558 if ((r->flags & (WPA_SCAN_LEVEL_DBM | WPA_SCAN_NOISE_INVALID))
1559 == WPA_SCAN_LEVEL_DBM) {
1560 int snr = r->level - r->noise;
1561 wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d "
1562 "noise=%d level=%d snr=%d%s flags=0x%x "
1563 "age=%u",
1564 MAC2STR(r->bssid), r->freq, r->qual,
1565 r->noise, r->level, snr,
1566 snr >= GREAT_SNR ? "*" : "", r->flags,
1567 r->age);
1568 } else {
1569 wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d "
1570 "noise=%d level=%d flags=0x%x age=%u",
1571 MAC2STR(r->bssid), r->freq, r->qual,
1572 r->noise, r->level, r->flags, r->age);
1573 }
1574 pos = (u8 *) (r + 1);
1575 if (r->ie_len)
1576 wpa_hexdump(MSG_EXCESSIVE, "IEs", pos, r->ie_len);
1577 pos += r->ie_len;
1578 if (r->beacon_ie_len)
1579 wpa_hexdump(MSG_EXCESSIVE, "Beacon IEs",
1580 pos, r->beacon_ie_len);
1581 }
1582 #endif /* CONFIG_NO_STDOUT_DEBUG */
1583 }
1584
1585
1586 /**
1587 * wpa_supplicant_filter_bssid_match - Is the specified BSSID allowed
1588 * @wpa_s: Pointer to wpa_supplicant data
1589 * @bssid: BSSID to check
1590 * Returns: 0 if the BSSID is filtered or 1 if not
1591 *
1592 * This function is used to filter out specific BSSIDs from scan reslts mainly
1593 * for testing purposes (SET bssid_filter ctrl_iface command).
1594 */
1595 int wpa_supplicant_filter_bssid_match(struct wpa_supplicant *wpa_s,
1596 const u8 *bssid)
1597 {
1598 size_t i;
1599
1600 if (wpa_s->bssid_filter == NULL)
1601 return 1;
1602
1603 for (i = 0; i < wpa_s->bssid_filter_count; i++) {
1604 if (os_memcmp(wpa_s->bssid_filter + i * ETH_ALEN, bssid,
1605 ETH_ALEN) == 0)
1606 return 1;
1607 }
1608
1609 return 0;
1610 }
1611
1612
1613 static void filter_scan_res(struct wpa_supplicant *wpa_s,
1614 struct wpa_scan_results *res)
1615 {
1616 size_t i, j;
1617
1618 if (wpa_s->bssid_filter == NULL)
1619 return;
1620
1621 for (i = 0, j = 0; i < res->num; i++) {
1622 if (wpa_supplicant_filter_bssid_match(wpa_s,
1623 res->res[i]->bssid)) {
1624 res->res[j++] = res->res[i];
1625 } else {
1626 os_free(res->res[i]);
1627 res->res[i] = NULL;
1628 }
1629 }
1630
1631 if (res->num != j) {
1632 wpa_printf(MSG_DEBUG, "Filtered out %d scan results",
1633 (int) (res->num - j));
1634 res->num = j;
1635 }
1636 }
1637
1638
1639 /**
1640 * wpa_supplicant_get_scan_results - Get scan results
1641 * @wpa_s: Pointer to wpa_supplicant data
1642 * @info: Information about what was scanned or %NULL if not available
1643 * @new_scan: Whether a new scan was performed
1644 * Returns: Scan results, %NULL on failure
1645 *
1646 * This function request the current scan results from the driver and updates
1647 * the local BSS list wpa_s->bss. The caller is responsible for freeing the
1648 * results with wpa_scan_results_free().
1649 */
1650 struct wpa_scan_results *
1651 wpa_supplicant_get_scan_results(struct wpa_supplicant *wpa_s,
1652 struct scan_info *info, int new_scan)
1653 {
1654 struct wpa_scan_results *scan_res;
1655 size_t i;
1656 int (*compar)(const void *, const void *) = wpa_scan_result_compar;
1657
1658 scan_res = wpa_drv_get_scan_results2(wpa_s);
1659 if (scan_res == NULL) {
1660 wpa_dbg(wpa_s, MSG_DEBUG, "Failed to get scan results");
1661 return NULL;
1662 }
1663 if (scan_res->fetch_time.sec == 0) {
1664 /*
1665 * Make sure we have a valid timestamp if the driver wrapper
1666 * does not set this.
1667 */
1668 os_get_reltime(&scan_res->fetch_time);
1669 }
1670 filter_scan_res(wpa_s, scan_res);
1671
1672 #ifdef CONFIG_WPS
1673 if (wpas_wps_searching(wpa_s)) {
1674 wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Order scan results with WPS "
1675 "provisioning rules");
1676 compar = wpa_scan_result_wps_compar;
1677 }
1678 #endif /* CONFIG_WPS */
1679
1680 qsort(scan_res->res, scan_res->num, sizeof(struct wpa_scan_res *),
1681 compar);
1682 dump_scan_res(scan_res);
1683
1684 wpa_bss_update_start(wpa_s);
1685 for (i = 0; i < scan_res->num; i++)
1686 wpa_bss_update_scan_res(wpa_s, scan_res->res[i],
1687 &scan_res->fetch_time);
1688 wpa_bss_update_end(wpa_s, info, new_scan);
1689
1690 return scan_res;
1691 }
1692
1693
1694 /**
1695 * wpa_supplicant_update_scan_results - Update scan results from the driver
1696 * @wpa_s: Pointer to wpa_supplicant data
1697 * Returns: 0 on success, -1 on failure
1698 *
1699 * This function updates the BSS table within wpa_supplicant based on the
1700 * currently available scan results from the driver without requesting a new
1701 * scan. This is used in cases where the driver indicates an association
1702 * (including roaming within ESS) and wpa_supplicant does not yet have the
1703 * needed information to complete the connection (e.g., to perform validation
1704 * steps in 4-way handshake).
1705 */
1706 int wpa_supplicant_update_scan_results(struct wpa_supplicant *wpa_s)
1707 {
1708 struct wpa_scan_results *scan_res;
1709 scan_res = wpa_supplicant_get_scan_results(wpa_s, NULL, 0);
1710 if (scan_res == NULL)
1711 return -1;
1712 wpa_scan_results_free(scan_res);
1713
1714 return 0;
1715 }
1716
1717
1718 /**
1719 * scan_only_handler - Reports scan results
1720 */
1721 void scan_only_handler(struct wpa_supplicant *wpa_s,
1722 struct wpa_scan_results *scan_res)
1723 {
1724 wpa_dbg(wpa_s, MSG_DEBUG, "Scan-only results received");
1725 if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
1726 wpa_s->manual_scan_use_id && wpa_s->own_scan_running) {
1727 wpa_msg_ctrl(wpa_s, MSG_INFO, WPA_EVENT_SCAN_RESULTS "id=%u",
1728 wpa_s->manual_scan_id);
1729 wpa_s->manual_scan_use_id = 0;
1730 } else {
1731 wpa_msg_ctrl(wpa_s, MSG_INFO, WPA_EVENT_SCAN_RESULTS);
1732 }
1733 wpas_notify_scan_results(wpa_s);
1734 wpas_notify_scan_done(wpa_s, 1);
1735 if (wpa_s->scan_work) {
1736 struct wpa_radio_work *work = wpa_s->scan_work;
1737 wpa_s->scan_work = NULL;
1738 radio_work_done(work);
1739 }
1740 }
1741
1742
1743 int wpas_scan_scheduled(struct wpa_supplicant *wpa_s)
1744 {
1745 return eloop_is_timeout_registered(wpa_supplicant_scan, wpa_s, NULL);
1746 }
1747
1748
1749 struct wpa_driver_scan_params *
1750 wpa_scan_clone_params(const struct wpa_driver_scan_params *src)
1751 {
1752 struct wpa_driver_scan_params *params;
1753 size_t i;
1754 u8 *n;
1755
1756 params = os_zalloc(sizeof(*params));
1757 if (params == NULL)
1758 return NULL;
1759
1760 for (i = 0; i < src->num_ssids; i++) {
1761 if (src->ssids[i].ssid) {
1762 n = os_malloc(src->ssids[i].ssid_len);
1763 if (n == NULL)
1764 goto failed;
1765 os_memcpy(n, src->ssids[i].ssid,
1766 src->ssids[i].ssid_len);
1767 params->ssids[i].ssid = n;
1768 params->ssids[i].ssid_len = src->ssids[i].ssid_len;
1769 }
1770 }
1771 params->num_ssids = src->num_ssids;
1772
1773 if (src->extra_ies) {
1774 n = os_malloc(src->extra_ies_len);
1775 if (n == NULL)
1776 goto failed;
1777 os_memcpy(n, src->extra_ies, src->extra_ies_len);
1778 params->extra_ies = n;
1779 params->extra_ies_len = src->extra_ies_len;
1780 }
1781
1782 if (src->freqs) {
1783 int len = int_array_len(src->freqs);
1784 params->freqs = os_malloc((len + 1) * sizeof(int));
1785 if (params->freqs == NULL)
1786 goto failed;
1787 os_memcpy(params->freqs, src->freqs, (len + 1) * sizeof(int));
1788 }
1789
1790 if (src->filter_ssids) {
1791 params->filter_ssids = os_malloc(sizeof(params->filter_ssids) *
1792 src->num_filter_ssids);
1793 if (params->filter_ssids == NULL)
1794 goto failed;
1795 os_memcpy(params->filter_ssids, src->filter_ssids,
1796 sizeof(params->filter_ssids) * src->num_filter_ssids);
1797 params->num_filter_ssids = src->num_filter_ssids;
1798 }
1799
1800 params->filter_rssi = src->filter_rssi;
1801 params->p2p_probe = src->p2p_probe;
1802 params->only_new_results = src->only_new_results;
1803
1804 return params;
1805
1806 failed:
1807 wpa_scan_free_params(params);
1808 return NULL;
1809 }
1810
1811
1812 void wpa_scan_free_params(struct wpa_driver_scan_params *params)
1813 {
1814 size_t i;
1815
1816 if (params == NULL)
1817 return;
1818
1819 for (i = 0; i < params->num_ssids; i++)
1820 os_free((u8 *) params->ssids[i].ssid);
1821 os_free((u8 *) params->extra_ies);
1822 os_free(params->freqs);
1823 os_free(params->filter_ssids);
1824 os_free(params);
1825 }
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