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wpa_supplicant: Complete radio works on disable event
[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, 4);
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
374 wpabuf_put_u8(buf, WLAN_EID_INTERWORKING);
375 wpabuf_put_u8(buf, is_zero_ether_addr(wpa_s->conf->hessid) ? 1 :
376 1 + ETH_ALEN);
377 wpabuf_put_u8(buf, wpa_s->conf->access_network_type);
378 /* No Venue Info */
379 if (!is_zero_ether_addr(wpa_s->conf->hessid))
380 wpabuf_put_data(buf, wpa_s->conf->hessid, ETH_ALEN);
381 }
382 #endif /* CONFIG_INTERWORKING */
383
384
385 static struct wpabuf * wpa_supplicant_extra_ies(struct wpa_supplicant *wpa_s)
386 {
387 struct wpabuf *extra_ie = NULL;
388 #ifdef CONFIG_WPS
389 int wps = 0;
390 enum wps_request_type req_type = WPS_REQ_ENROLLEE_INFO;
391 #endif /* CONFIG_WPS */
392
393 #ifdef CONFIG_INTERWORKING
394 if (wpa_s->conf->interworking &&
395 wpabuf_resize(&extra_ie, 100) == 0)
396 wpas_add_interworking_elements(wpa_s, extra_ie);
397 #endif /* CONFIG_INTERWORKING */
398
399 #ifdef CONFIG_WPS
400 wps = wpas_wps_in_use(wpa_s, &req_type);
401
402 if (wps) {
403 struct wpabuf *wps_ie;
404 wps_ie = wps_build_probe_req_ie(wps == 2 ? DEV_PW_PUSHBUTTON :
405 DEV_PW_DEFAULT,
406 &wpa_s->wps->dev,
407 wpa_s->wps->uuid, req_type,
408 0, NULL);
409 if (wps_ie) {
410 if (wpabuf_resize(&extra_ie, wpabuf_len(wps_ie)) == 0)
411 wpabuf_put_buf(extra_ie, wps_ie);
412 wpabuf_free(wps_ie);
413 }
414 }
415
416 #ifdef CONFIG_P2P
417 if (wps) {
418 size_t ielen = p2p_scan_ie_buf_len(wpa_s->global->p2p);
419 if (wpabuf_resize(&extra_ie, ielen) == 0)
420 wpas_p2p_scan_ie(wpa_s, extra_ie);
421 }
422 #endif /* CONFIG_P2P */
423
424 #endif /* CONFIG_WPS */
425
426 #ifdef CONFIG_HS20
427 if (wpa_s->conf->hs20 && wpabuf_resize(&extra_ie, 7) == 0)
428 wpas_hs20_add_indication(extra_ie);
429 #endif /* CONFIG_HS20 */
430
431 return extra_ie;
432 }
433
434
435 #ifdef CONFIG_P2P
436
437 /*
438 * Check whether there are any enabled networks or credentials that could be
439 * used for a non-P2P connection.
440 */
441 static int non_p2p_network_enabled(struct wpa_supplicant *wpa_s)
442 {
443 struct wpa_ssid *ssid;
444
445 for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
446 if (wpas_network_disabled(wpa_s, ssid))
447 continue;
448 if (!ssid->p2p_group)
449 return 1;
450 }
451
452 if (wpa_s->conf->cred && wpa_s->conf->interworking &&
453 wpa_s->conf->auto_interworking)
454 return 1;
455
456 return 0;
457 }
458
459 #endif /* CONFIG_P2P */
460
461
462 static struct hostapd_hw_modes * get_mode(struct hostapd_hw_modes *modes,
463 u16 num_modes,
464 enum hostapd_hw_mode mode)
465 {
466 u16 i;
467
468 for (i = 0; i < num_modes; i++) {
469 if (modes[i].mode == mode)
470 return &modes[i];
471 }
472
473 return NULL;
474 }
475
476
477 static void wpa_setband_scan_freqs_list(struct wpa_supplicant *wpa_s,
478 enum hostapd_hw_mode band,
479 struct wpa_driver_scan_params *params)
480 {
481 /* Include only supported channels for the specified band */
482 struct hostapd_hw_modes *mode;
483 int count, i;
484
485 mode = get_mode(wpa_s->hw.modes, wpa_s->hw.num_modes, band);
486 if (mode == NULL) {
487 /* No channels supported in this band - use empty list */
488 params->freqs = os_zalloc(sizeof(int));
489 return;
490 }
491
492 params->freqs = os_zalloc((mode->num_channels + 1) * sizeof(int));
493 if (params->freqs == NULL)
494 return;
495 for (count = 0, i = 0; i < mode->num_channels; i++) {
496 if (mode->channels[i].flag & HOSTAPD_CHAN_DISABLED)
497 continue;
498 params->freqs[count++] = mode->channels[i].freq;
499 }
500 }
501
502
503 static void wpa_setband_scan_freqs(struct wpa_supplicant *wpa_s,
504 struct wpa_driver_scan_params *params)
505 {
506 if (wpa_s->hw.modes == NULL)
507 return; /* unknown what channels the driver supports */
508 if (params->freqs)
509 return; /* already using a limited channel set */
510 if (wpa_s->setband == WPA_SETBAND_5G)
511 wpa_setband_scan_freqs_list(wpa_s, HOSTAPD_MODE_IEEE80211A,
512 params);
513 else if (wpa_s->setband == WPA_SETBAND_2G)
514 wpa_setband_scan_freqs_list(wpa_s, HOSTAPD_MODE_IEEE80211G,
515 params);
516 }
517
518
519 static void wpa_supplicant_scan(void *eloop_ctx, void *timeout_ctx)
520 {
521 struct wpa_supplicant *wpa_s = eloop_ctx;
522 struct wpa_ssid *ssid;
523 int ret;
524 struct wpabuf *extra_ie = NULL;
525 struct wpa_driver_scan_params params;
526 struct wpa_driver_scan_params *scan_params;
527 size_t max_ssids;
528 enum wpa_states prev_state;
529
530 if (wpa_s->pno || wpa_s->pno_sched_pending) {
531 wpa_dbg(wpa_s, MSG_DEBUG, "Skip scan - PNO is in progress");
532 return;
533 }
534
535 if (wpa_s->wpa_state == WPA_INTERFACE_DISABLED) {
536 wpa_dbg(wpa_s, MSG_DEBUG, "Skip scan - interface disabled");
537 return;
538 }
539
540 if (wpa_s->disconnected && wpa_s->scan_req == NORMAL_SCAN_REQ) {
541 wpa_dbg(wpa_s, MSG_DEBUG, "Disconnected - do not scan");
542 wpa_supplicant_set_state(wpa_s, WPA_DISCONNECTED);
543 return;
544 }
545
546 if (wpa_s->scanning) {
547 /*
548 * If we are already in scanning state, we shall reschedule the
549 * the incoming scan request.
550 */
551 wpa_dbg(wpa_s, MSG_DEBUG, "Already scanning - Reschedule the incoming scan req");
552 wpa_supplicant_req_scan(wpa_s, 1, 0);
553 return;
554 }
555
556 if (!wpa_supplicant_enabled_networks(wpa_s) &&
557 wpa_s->scan_req == NORMAL_SCAN_REQ) {
558 wpa_dbg(wpa_s, MSG_DEBUG, "No enabled networks - do not scan");
559 wpa_supplicant_set_state(wpa_s, WPA_INACTIVE);
560 return;
561 }
562
563 if (wpa_s->conf->ap_scan != 0 &&
564 (wpa_s->drv_flags & WPA_DRIVER_FLAGS_WIRED)) {
565 wpa_dbg(wpa_s, MSG_DEBUG, "Using wired authentication - "
566 "overriding ap_scan configuration");
567 wpa_s->conf->ap_scan = 0;
568 wpas_notify_ap_scan_changed(wpa_s);
569 }
570
571 if (wpa_s->conf->ap_scan == 0) {
572 wpa_supplicant_gen_assoc_event(wpa_s);
573 return;
574 }
575
576 #ifdef CONFIG_P2P
577 if (wpas_p2p_in_progress(wpa_s)) {
578 wpa_dbg(wpa_s, MSG_DEBUG, "Delay station mode scan while P2P operation is in progress");
579 wpa_supplicant_req_scan(wpa_s, 5, 0);
580 return;
581 }
582 #endif /* CONFIG_P2P */
583
584 if (wpa_s->conf->ap_scan == 2)
585 max_ssids = 1;
586 else {
587 max_ssids = wpa_s->max_scan_ssids;
588 if (max_ssids > WPAS_MAX_SCAN_SSIDS)
589 max_ssids = WPAS_MAX_SCAN_SSIDS;
590 }
591
592 wpa_s->last_scan_req = wpa_s->scan_req;
593 wpa_s->scan_req = NORMAL_SCAN_REQ;
594
595 os_memset(&params, 0, sizeof(params));
596
597 prev_state = wpa_s->wpa_state;
598 if (wpa_s->wpa_state == WPA_DISCONNECTED ||
599 wpa_s->wpa_state == WPA_INACTIVE)
600 wpa_supplicant_set_state(wpa_s, WPA_SCANNING);
601
602 /*
603 * If autoscan has set its own scanning parameters
604 */
605 if (wpa_s->autoscan_params != NULL) {
606 scan_params = wpa_s->autoscan_params;
607 goto scan;
608 }
609
610 if (wpa_s->last_scan_req != MANUAL_SCAN_REQ &&
611 wpa_s->connect_without_scan) {
612 for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
613 if (ssid == wpa_s->connect_without_scan)
614 break;
615 }
616 wpa_s->connect_without_scan = NULL;
617 if (ssid) {
618 wpa_printf(MSG_DEBUG, "Start a pre-selected network "
619 "without scan step");
620 wpa_supplicant_associate(wpa_s, NULL, ssid);
621 return;
622 }
623 }
624
625 #ifdef CONFIG_P2P
626 if ((wpa_s->p2p_in_provisioning || wpa_s->show_group_started) &&
627 wpa_s->go_params) {
628 wpa_printf(MSG_DEBUG, "P2P: Use specific SSID for scan during P2P group formation (p2p_in_provisioning=%d show_group_started=%d)",
629 wpa_s->p2p_in_provisioning,
630 wpa_s->show_group_started);
631 params.ssids[0].ssid = wpa_s->go_params->ssid;
632 params.ssids[0].ssid_len = wpa_s->go_params->ssid_len;
633 params.num_ssids = 1;
634 goto ssid_list_set;
635 }
636 #endif /* CONFIG_P2P */
637
638 /* Find the starting point from which to continue scanning */
639 ssid = wpa_s->conf->ssid;
640 if (wpa_s->prev_scan_ssid != WILDCARD_SSID_SCAN) {
641 while (ssid) {
642 if (ssid == wpa_s->prev_scan_ssid) {
643 ssid = ssid->next;
644 break;
645 }
646 ssid = ssid->next;
647 }
648 }
649
650 if (wpa_s->last_scan_req != MANUAL_SCAN_REQ &&
651 wpa_s->conf->ap_scan == 2) {
652 wpa_s->connect_without_scan = NULL;
653 wpa_s->prev_scan_wildcard = 0;
654 wpa_supplicant_assoc_try(wpa_s, ssid);
655 return;
656 } else if (wpa_s->conf->ap_scan == 2) {
657 /*
658 * User-initiated scan request in ap_scan == 2; scan with
659 * wildcard SSID.
660 */
661 ssid = NULL;
662 } else {
663 struct wpa_ssid *start = ssid, *tssid;
664 int freqs_set = 0;
665 if (ssid == NULL && max_ssids > 1)
666 ssid = wpa_s->conf->ssid;
667 while (ssid) {
668 if (!wpas_network_disabled(wpa_s, ssid) &&
669 ssid->scan_ssid) {
670 wpa_hexdump_ascii(MSG_DEBUG, "Scan SSID",
671 ssid->ssid, ssid->ssid_len);
672 params.ssids[params.num_ssids].ssid =
673 ssid->ssid;
674 params.ssids[params.num_ssids].ssid_len =
675 ssid->ssid_len;
676 params.num_ssids++;
677 if (params.num_ssids + 1 >= max_ssids)
678 break;
679 }
680 ssid = ssid->next;
681 if (ssid == start)
682 break;
683 if (ssid == NULL && max_ssids > 1 &&
684 start != wpa_s->conf->ssid)
685 ssid = wpa_s->conf->ssid;
686 }
687
688 for (tssid = wpa_s->conf->ssid; tssid; tssid = tssid->next) {
689 if (wpas_network_disabled(wpa_s, tssid))
690 continue;
691 if ((params.freqs || !freqs_set) && tssid->scan_freq) {
692 int_array_concat(&params.freqs,
693 tssid->scan_freq);
694 } else {
695 os_free(params.freqs);
696 params.freqs = NULL;
697 }
698 freqs_set = 1;
699 }
700 int_array_sort_unique(params.freqs);
701 }
702
703 if (ssid && max_ssids == 1) {
704 /*
705 * If the driver is limited to 1 SSID at a time interleave
706 * wildcard SSID scans with specific SSID scans to avoid
707 * waiting a long time for a wildcard scan.
708 */
709 if (!wpa_s->prev_scan_wildcard) {
710 params.ssids[0].ssid = NULL;
711 params.ssids[0].ssid_len = 0;
712 wpa_s->prev_scan_wildcard = 1;
713 wpa_dbg(wpa_s, MSG_DEBUG, "Starting AP scan for "
714 "wildcard SSID (Interleave with specific)");
715 } else {
716 wpa_s->prev_scan_ssid = ssid;
717 wpa_s->prev_scan_wildcard = 0;
718 wpa_dbg(wpa_s, MSG_DEBUG,
719 "Starting AP scan for specific SSID: %s",
720 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
721 }
722 } else if (ssid) {
723 /* max_ssids > 1 */
724
725 wpa_s->prev_scan_ssid = ssid;
726 wpa_dbg(wpa_s, MSG_DEBUG, "Include wildcard SSID in "
727 "the scan request");
728 params.num_ssids++;
729 } else if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
730 wpa_s->manual_scan_passive && params.num_ssids == 0) {
731 wpa_dbg(wpa_s, MSG_DEBUG, "Use passive scan based on manual request");
732 } else {
733 wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
734 params.num_ssids++;
735 wpa_dbg(wpa_s, MSG_DEBUG, "Starting AP scan for wildcard "
736 "SSID");
737 }
738 #ifdef CONFIG_P2P
739 ssid_list_set:
740 #endif /* CONFIG_P2P */
741
742 wpa_supplicant_optimize_freqs(wpa_s, &params);
743 extra_ie = wpa_supplicant_extra_ies(wpa_s);
744
745 if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
746 wpa_s->manual_scan_only_new)
747 params.only_new_results = 1;
748
749 if (wpa_s->last_scan_req == MANUAL_SCAN_REQ && params.freqs == NULL &&
750 wpa_s->manual_scan_freqs) {
751 wpa_dbg(wpa_s, MSG_DEBUG, "Limit manual scan to specified channels");
752 params.freqs = wpa_s->manual_scan_freqs;
753 wpa_s->manual_scan_freqs = NULL;
754 }
755
756 if (params.freqs == NULL && wpa_s->next_scan_freqs) {
757 wpa_dbg(wpa_s, MSG_DEBUG, "Optimize scan based on previously "
758 "generated frequency list");
759 params.freqs = wpa_s->next_scan_freqs;
760 } else
761 os_free(wpa_s->next_scan_freqs);
762 wpa_s->next_scan_freqs = NULL;
763 wpa_setband_scan_freqs(wpa_s, &params);
764
765 /* See if user specified frequencies. If so, scan only those. */
766 if (wpa_s->conf->freq_list && !params.freqs) {
767 wpa_dbg(wpa_s, MSG_DEBUG,
768 "Optimize scan based on conf->freq_list");
769 int_array_concat(&params.freqs, wpa_s->conf->freq_list);
770 }
771
772 /* Use current associated channel? */
773 if (wpa_s->conf->scan_cur_freq && !params.freqs) {
774 unsigned int num = wpa_s->num_multichan_concurrent;
775
776 params.freqs = os_calloc(num + 1, sizeof(int));
777 if (params.freqs) {
778 num = get_shared_radio_freqs(wpa_s, params.freqs, num);
779 if (num > 0) {
780 wpa_dbg(wpa_s, MSG_DEBUG, "Scan only the "
781 "current operating channels since "
782 "scan_cur_freq is enabled");
783 } else {
784 os_free(params.freqs);
785 params.freqs = NULL;
786 }
787 }
788 }
789
790 params.filter_ssids = wpa_supplicant_build_filter_ssids(
791 wpa_s->conf, &params.num_filter_ssids);
792 if (extra_ie) {
793 params.extra_ies = wpabuf_head(extra_ie);
794 params.extra_ies_len = wpabuf_len(extra_ie);
795 }
796
797 #ifdef CONFIG_P2P
798 if (wpa_s->p2p_in_provisioning ||
799 (wpa_s->show_group_started && wpa_s->go_params)) {
800 /*
801 * The interface may not yet be in P2P mode, so we have to
802 * explicitly request P2P probe to disable CCK rates.
803 */
804 params.p2p_probe = 1;
805 }
806 #endif /* CONFIG_P2P */
807
808 scan_params = &params;
809
810 scan:
811 #ifdef CONFIG_P2P
812 /*
813 * If the driver does not support multi-channel concurrency and a
814 * virtual interface that shares the same radio with the wpa_s interface
815 * is operating there may not be need to scan other channels apart from
816 * the current operating channel on the other virtual interface. Filter
817 * out other channels in case we are trying to find a connection for a
818 * station interface when we are not configured to prefer station
819 * connection and a concurrent operation is already in process.
820 */
821 if (wpa_s->scan_for_connection &&
822 wpa_s->last_scan_req == NORMAL_SCAN_REQ &&
823 !scan_params->freqs && !params.freqs &&
824 wpas_is_p2p_prioritized(wpa_s) &&
825 wpa_s->p2p_group_interface == NOT_P2P_GROUP_INTERFACE &&
826 non_p2p_network_enabled(wpa_s)) {
827 unsigned int num = wpa_s->num_multichan_concurrent;
828
829 params.freqs = os_calloc(num + 1, sizeof(int));
830 if (params.freqs) {
831 num = get_shared_radio_freqs(wpa_s, params.freqs, num);
832 if (num > 0 && num == wpa_s->num_multichan_concurrent) {
833 wpa_dbg(wpa_s, MSG_DEBUG, "Scan only the current operating channels since all channels are already used");
834 } else {
835 os_free(params.freqs);
836 params.freqs = NULL;
837 }
838 }
839 }
840 #endif /* CONFIG_P2P */
841
842 ret = wpa_supplicant_trigger_scan(wpa_s, scan_params);
843
844 if (ret && wpa_s->last_scan_req == MANUAL_SCAN_REQ && params.freqs &&
845 !wpa_s->manual_scan_freqs) {
846 /* Restore manual_scan_freqs for the next attempt */
847 wpa_s->manual_scan_freqs = params.freqs;
848 params.freqs = NULL;
849 }
850
851 wpabuf_free(extra_ie);
852 os_free(params.freqs);
853 os_free(params.filter_ssids);
854
855 if (ret) {
856 wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate AP scan");
857 if (prev_state != wpa_s->wpa_state)
858 wpa_supplicant_set_state(wpa_s, prev_state);
859 /* Restore scan_req since we will try to scan again */
860 wpa_s->scan_req = wpa_s->last_scan_req;
861 wpa_supplicant_req_scan(wpa_s, 1, 0);
862 } else {
863 wpa_s->scan_for_connection = 0;
864 }
865 }
866
867
868 void wpa_supplicant_update_scan_int(struct wpa_supplicant *wpa_s, int sec)
869 {
870 struct os_reltime remaining, new_int;
871 int cancelled;
872
873 cancelled = eloop_cancel_timeout_one(wpa_supplicant_scan, wpa_s, NULL,
874 &remaining);
875
876 new_int.sec = sec;
877 new_int.usec = 0;
878 if (cancelled && os_reltime_before(&remaining, &new_int)) {
879 new_int.sec = remaining.sec;
880 new_int.usec = remaining.usec;
881 }
882
883 if (cancelled) {
884 eloop_register_timeout(new_int.sec, new_int.usec,
885 wpa_supplicant_scan, wpa_s, NULL);
886 }
887 wpa_s->scan_interval = sec;
888 }
889
890
891 /**
892 * wpa_supplicant_req_scan - Schedule a scan for neighboring access points
893 * @wpa_s: Pointer to wpa_supplicant data
894 * @sec: Number of seconds after which to scan
895 * @usec: Number of microseconds after which to scan
896 *
897 * This function is used to schedule a scan for neighboring access points after
898 * the specified time.
899 */
900 void wpa_supplicant_req_scan(struct wpa_supplicant *wpa_s, int sec, int usec)
901 {
902 int res = eloop_deplete_timeout(sec, usec, wpa_supplicant_scan, wpa_s,
903 NULL);
904 if (res == 1) {
905 wpa_dbg(wpa_s, MSG_DEBUG, "Rescheduling scan request: %d.%06d sec",
906 sec, usec);
907 } else if (res == 0) {
908 wpa_dbg(wpa_s, MSG_DEBUG, "Ignore new scan request for %d.%06d sec since an earlier request is scheduled to trigger sooner",
909 sec, usec);
910 } else {
911 wpa_dbg(wpa_s, MSG_DEBUG, "Setting scan request: %d.%06d sec",
912 sec, usec);
913 eloop_register_timeout(sec, usec, wpa_supplicant_scan, wpa_s, NULL);
914 }
915 }
916
917
918 /**
919 * wpa_supplicant_delayed_sched_scan - Request a delayed scheduled scan
920 * @wpa_s: Pointer to wpa_supplicant data
921 * @sec: Number of seconds after which to scan
922 * @usec: Number of microseconds after which to scan
923 * Returns: 0 on success or -1 otherwise
924 *
925 * This function is used to schedule periodic scans for neighboring
926 * access points after the specified time.
927 */
928 int wpa_supplicant_delayed_sched_scan(struct wpa_supplicant *wpa_s,
929 int sec, int usec)
930 {
931 if (!wpa_s->sched_scan_supported)
932 return -1;
933
934 eloop_register_timeout(sec, usec,
935 wpa_supplicant_delayed_sched_scan_timeout,
936 wpa_s, NULL);
937
938 return 0;
939 }
940
941
942 /**
943 * wpa_supplicant_req_sched_scan - Start a periodic scheduled scan
944 * @wpa_s: Pointer to wpa_supplicant data
945 * Returns: 0 is sched_scan was started or -1 otherwise
946 *
947 * This function is used to schedule periodic scans for neighboring
948 * access points repeating the scan continuously.
949 */
950 int wpa_supplicant_req_sched_scan(struct wpa_supplicant *wpa_s)
951 {
952 struct wpa_driver_scan_params params;
953 struct wpa_driver_scan_params *scan_params;
954 enum wpa_states prev_state;
955 struct wpa_ssid *ssid = NULL;
956 struct wpabuf *extra_ie = NULL;
957 int ret;
958 unsigned int max_sched_scan_ssids;
959 int wildcard = 0;
960 int need_ssids;
961
962 if (!wpa_s->sched_scan_supported)
963 return -1;
964
965 if (wpa_s->max_sched_scan_ssids > WPAS_MAX_SCAN_SSIDS)
966 max_sched_scan_ssids = WPAS_MAX_SCAN_SSIDS;
967 else
968 max_sched_scan_ssids = wpa_s->max_sched_scan_ssids;
969 if (max_sched_scan_ssids < 1 || wpa_s->conf->disable_scan_offload)
970 return -1;
971
972 if (wpa_s->sched_scanning) {
973 wpa_dbg(wpa_s, MSG_DEBUG, "Already sched scanning");
974 return 0;
975 }
976
977 need_ssids = 0;
978 for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
979 if (!wpas_network_disabled(wpa_s, ssid) && !ssid->scan_ssid) {
980 /* Use wildcard SSID to find this network */
981 wildcard = 1;
982 } else if (!wpas_network_disabled(wpa_s, ssid) &&
983 ssid->ssid_len)
984 need_ssids++;
985
986 #ifdef CONFIG_WPS
987 if (!wpas_network_disabled(wpa_s, ssid) &&
988 ssid->key_mgmt == WPA_KEY_MGMT_WPS) {
989 /*
990 * Normal scan is more reliable and faster for WPS
991 * operations and since these are for short periods of
992 * time, the benefit of trying to use sched_scan would
993 * be limited.
994 */
995 wpa_dbg(wpa_s, MSG_DEBUG, "Use normal scan instead of "
996 "sched_scan for WPS");
997 return -1;
998 }
999 #endif /* CONFIG_WPS */
1000 }
1001 if (wildcard)
1002 need_ssids++;
1003
1004 if (wpa_s->normal_scans < 3 &&
1005 (need_ssids <= wpa_s->max_scan_ssids ||
1006 wpa_s->max_scan_ssids >= (int) max_sched_scan_ssids)) {
1007 /*
1008 * When normal scan can speed up operations, use that for the
1009 * first operations before starting the sched_scan to allow
1010 * user space sleep more. We do this only if the normal scan
1011 * has functionality that is suitable for this or if the
1012 * sched_scan does not have better support for multiple SSIDs.
1013 */
1014 wpa_dbg(wpa_s, MSG_DEBUG, "Use normal scan instead of "
1015 "sched_scan for initial scans (normal_scans=%d)",
1016 wpa_s->normal_scans);
1017 return -1;
1018 }
1019
1020 os_memset(&params, 0, sizeof(params));
1021
1022 /* If we can't allocate space for the filters, we just don't filter */
1023 params.filter_ssids = os_zalloc(wpa_s->max_match_sets *
1024 sizeof(struct wpa_driver_scan_filter));
1025
1026 prev_state = wpa_s->wpa_state;
1027 if (wpa_s->wpa_state == WPA_DISCONNECTED ||
1028 wpa_s->wpa_state == WPA_INACTIVE)
1029 wpa_supplicant_set_state(wpa_s, WPA_SCANNING);
1030
1031 if (wpa_s->autoscan_params != NULL) {
1032 scan_params = wpa_s->autoscan_params;
1033 goto scan;
1034 }
1035
1036 /* Find the starting point from which to continue scanning */
1037 ssid = wpa_s->conf->ssid;
1038 if (wpa_s->prev_sched_ssid) {
1039 while (ssid) {
1040 if (ssid == wpa_s->prev_sched_ssid) {
1041 ssid = ssid->next;
1042 break;
1043 }
1044 ssid = ssid->next;
1045 }
1046 }
1047
1048 if (!ssid || !wpa_s->prev_sched_ssid) {
1049 wpa_dbg(wpa_s, MSG_DEBUG, "Beginning of SSID list");
1050 if (wpa_s->conf->sched_scan_interval)
1051 wpa_s->sched_scan_interval =
1052 wpa_s->conf->sched_scan_interval;
1053 if (wpa_s->sched_scan_interval == 0)
1054 wpa_s->sched_scan_interval = 10;
1055 wpa_s->sched_scan_timeout = max_sched_scan_ssids * 2;
1056 wpa_s->first_sched_scan = 1;
1057 ssid = wpa_s->conf->ssid;
1058 wpa_s->prev_sched_ssid = ssid;
1059 }
1060
1061 if (wildcard) {
1062 wpa_dbg(wpa_s, MSG_DEBUG, "Add wildcard SSID to sched_scan");
1063 params.num_ssids++;
1064 }
1065
1066 while (ssid) {
1067 if (wpas_network_disabled(wpa_s, ssid))
1068 goto next;
1069
1070 if (params.num_filter_ssids < wpa_s->max_match_sets &&
1071 params.filter_ssids && ssid->ssid && ssid->ssid_len) {
1072 wpa_dbg(wpa_s, MSG_DEBUG, "add to filter ssid: %s",
1073 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
1074 os_memcpy(params.filter_ssids[params.num_filter_ssids].ssid,
1075 ssid->ssid, ssid->ssid_len);
1076 params.filter_ssids[params.num_filter_ssids].ssid_len =
1077 ssid->ssid_len;
1078 params.num_filter_ssids++;
1079 } else if (params.filter_ssids && ssid->ssid && ssid->ssid_len)
1080 {
1081 wpa_dbg(wpa_s, MSG_DEBUG, "Not enough room for SSID "
1082 "filter for sched_scan - drop filter");
1083 os_free(params.filter_ssids);
1084 params.filter_ssids = NULL;
1085 params.num_filter_ssids = 0;
1086 }
1087
1088 if (ssid->scan_ssid && ssid->ssid && ssid->ssid_len) {
1089 if (params.num_ssids == max_sched_scan_ssids)
1090 break; /* only room for broadcast SSID */
1091 wpa_dbg(wpa_s, MSG_DEBUG,
1092 "add to active scan ssid: %s",
1093 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
1094 params.ssids[params.num_ssids].ssid =
1095 ssid->ssid;
1096 params.ssids[params.num_ssids].ssid_len =
1097 ssid->ssid_len;
1098 params.num_ssids++;
1099 if (params.num_ssids >= max_sched_scan_ssids) {
1100 wpa_s->prev_sched_ssid = ssid;
1101 do {
1102 ssid = ssid->next;
1103 } while (ssid &&
1104 (wpas_network_disabled(wpa_s, ssid) ||
1105 !ssid->scan_ssid));
1106 break;
1107 }
1108 }
1109
1110 next:
1111 wpa_s->prev_sched_ssid = ssid;
1112 ssid = ssid->next;
1113 }
1114
1115 if (params.num_filter_ssids == 0) {
1116 os_free(params.filter_ssids);
1117 params.filter_ssids = NULL;
1118 }
1119
1120 extra_ie = wpa_supplicant_extra_ies(wpa_s);
1121 if (extra_ie) {
1122 params.extra_ies = wpabuf_head(extra_ie);
1123 params.extra_ies_len = wpabuf_len(extra_ie);
1124 }
1125
1126 if (wpa_s->conf->filter_rssi)
1127 params.filter_rssi = wpa_s->conf->filter_rssi;
1128
1129 scan_params = &params;
1130
1131 scan:
1132 if (ssid || !wpa_s->first_sched_scan) {
1133 wpa_dbg(wpa_s, MSG_DEBUG,
1134 "Starting sched scan: interval %d timeout %d",
1135 wpa_s->sched_scan_interval, wpa_s->sched_scan_timeout);
1136 } else {
1137 wpa_dbg(wpa_s, MSG_DEBUG,
1138 "Starting sched scan: interval %d (no timeout)",
1139 wpa_s->sched_scan_interval);
1140 }
1141
1142 wpa_setband_scan_freqs(wpa_s, scan_params);
1143
1144 ret = wpa_supplicant_start_sched_scan(wpa_s, scan_params,
1145 wpa_s->sched_scan_interval);
1146 wpabuf_free(extra_ie);
1147 os_free(params.filter_ssids);
1148 if (ret) {
1149 wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate sched scan");
1150 if (prev_state != wpa_s->wpa_state)
1151 wpa_supplicant_set_state(wpa_s, prev_state);
1152 return ret;
1153 }
1154
1155 /* If we have more SSIDs to scan, add a timeout so we scan them too */
1156 if (ssid || !wpa_s->first_sched_scan) {
1157 wpa_s->sched_scan_timed_out = 0;
1158 eloop_register_timeout(wpa_s->sched_scan_timeout, 0,
1159 wpa_supplicant_sched_scan_timeout,
1160 wpa_s, NULL);
1161 wpa_s->first_sched_scan = 0;
1162 wpa_s->sched_scan_timeout /= 2;
1163 wpa_s->sched_scan_interval *= 2;
1164 if (wpa_s->sched_scan_timeout < wpa_s->sched_scan_interval) {
1165 wpa_s->sched_scan_interval = 10;
1166 wpa_s->sched_scan_timeout = max_sched_scan_ssids * 2;
1167 }
1168 }
1169
1170 /* If there is no more ssids, start next time from the beginning */
1171 if (!ssid)
1172 wpa_s->prev_sched_ssid = NULL;
1173
1174 return 0;
1175 }
1176
1177
1178 /**
1179 * wpa_supplicant_cancel_scan - Cancel a scheduled scan request
1180 * @wpa_s: Pointer to wpa_supplicant data
1181 *
1182 * This function is used to cancel a scan request scheduled with
1183 * wpa_supplicant_req_scan().
1184 */
1185 void wpa_supplicant_cancel_scan(struct wpa_supplicant *wpa_s)
1186 {
1187 wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling scan request");
1188 eloop_cancel_timeout(wpa_supplicant_scan, wpa_s, NULL);
1189 }
1190
1191
1192 /**
1193 * wpa_supplicant_cancel_delayed_sched_scan - Stop a delayed scheduled scan
1194 * @wpa_s: Pointer to wpa_supplicant data
1195 *
1196 * This function is used to stop a delayed scheduled scan.
1197 */
1198 void wpa_supplicant_cancel_delayed_sched_scan(struct wpa_supplicant *wpa_s)
1199 {
1200 if (!wpa_s->sched_scan_supported)
1201 return;
1202
1203 wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling delayed sched scan");
1204 eloop_cancel_timeout(wpa_supplicant_delayed_sched_scan_timeout,
1205 wpa_s, NULL);
1206 }
1207
1208
1209 /**
1210 * wpa_supplicant_cancel_sched_scan - Stop running scheduled scans
1211 * @wpa_s: Pointer to wpa_supplicant data
1212 *
1213 * This function is used to stop a periodic scheduled scan.
1214 */
1215 void wpa_supplicant_cancel_sched_scan(struct wpa_supplicant *wpa_s)
1216 {
1217 if (!wpa_s->sched_scanning)
1218 return;
1219
1220 wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling sched scan");
1221 eloop_cancel_timeout(wpa_supplicant_sched_scan_timeout, wpa_s, NULL);
1222 wpa_supplicant_stop_sched_scan(wpa_s);
1223 }
1224
1225
1226 /**
1227 * wpa_supplicant_notify_scanning - Indicate possible scan state change
1228 * @wpa_s: Pointer to wpa_supplicant data
1229 * @scanning: Whether scanning is currently in progress
1230 *
1231 * This function is to generate scanning notifycations. It is called whenever
1232 * there may have been a change in scanning (scan started, completed, stopped).
1233 * wpas_notify_scanning() is called whenever the scanning state changed from the
1234 * previously notified state.
1235 */
1236 void wpa_supplicant_notify_scanning(struct wpa_supplicant *wpa_s,
1237 int scanning)
1238 {
1239 if (wpa_s->scanning != scanning) {
1240 wpa_s->scanning = scanning;
1241 wpas_notify_scanning(wpa_s);
1242 }
1243 }
1244
1245
1246 static int wpa_scan_get_max_rate(const struct wpa_scan_res *res)
1247 {
1248 int rate = 0;
1249 const u8 *ie;
1250 int i;
1251
1252 ie = wpa_scan_get_ie(res, WLAN_EID_SUPP_RATES);
1253 for (i = 0; ie && i < ie[1]; i++) {
1254 if ((ie[i + 2] & 0x7f) > rate)
1255 rate = ie[i + 2] & 0x7f;
1256 }
1257
1258 ie = wpa_scan_get_ie(res, WLAN_EID_EXT_SUPP_RATES);
1259 for (i = 0; ie && i < ie[1]; i++) {
1260 if ((ie[i + 2] & 0x7f) > rate)
1261 rate = ie[i + 2] & 0x7f;
1262 }
1263
1264 return rate;
1265 }
1266
1267
1268 /**
1269 * wpa_scan_get_ie - Fetch a specified information element from a scan result
1270 * @res: Scan result entry
1271 * @ie: Information element identitifier (WLAN_EID_*)
1272 * Returns: Pointer to the information element (id field) or %NULL if not found
1273 *
1274 * This function returns the first matching information element in the scan
1275 * result.
1276 */
1277 const u8 * wpa_scan_get_ie(const struct wpa_scan_res *res, u8 ie)
1278 {
1279 const u8 *end, *pos;
1280
1281 pos = (const u8 *) (res + 1);
1282 end = pos + res->ie_len;
1283
1284 while (pos + 1 < end) {
1285 if (pos + 2 + pos[1] > end)
1286 break;
1287 if (pos[0] == ie)
1288 return pos;
1289 pos += 2 + pos[1];
1290 }
1291
1292 return NULL;
1293 }
1294
1295
1296 /**
1297 * wpa_scan_get_vendor_ie - Fetch vendor information element from a scan result
1298 * @res: Scan result entry
1299 * @vendor_type: Vendor type (four octets starting the IE payload)
1300 * Returns: Pointer to the information element (id field) or %NULL if not found
1301 *
1302 * This function returns the first matching information element in the scan
1303 * result.
1304 */
1305 const u8 * wpa_scan_get_vendor_ie(const struct wpa_scan_res *res,
1306 u32 vendor_type)
1307 {
1308 const u8 *end, *pos;
1309
1310 pos = (const u8 *) (res + 1);
1311 end = pos + res->ie_len;
1312
1313 while (pos + 1 < end) {
1314 if (pos + 2 + pos[1] > end)
1315 break;
1316 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1317 vendor_type == WPA_GET_BE32(&pos[2]))
1318 return pos;
1319 pos += 2 + pos[1];
1320 }
1321
1322 return NULL;
1323 }
1324
1325
1326 /**
1327 * wpa_scan_get_vendor_ie_beacon - Fetch vendor information from a scan result
1328 * @res: Scan result entry
1329 * @vendor_type: Vendor type (four octets starting the IE payload)
1330 * Returns: Pointer to the information element (id field) or %NULL if not found
1331 *
1332 * This function returns the first matching information element in the scan
1333 * result.
1334 *
1335 * This function is like wpa_scan_get_vendor_ie(), but uses IE buffer only
1336 * from Beacon frames instead of either Beacon or Probe Response frames.
1337 */
1338 const u8 * wpa_scan_get_vendor_ie_beacon(const struct wpa_scan_res *res,
1339 u32 vendor_type)
1340 {
1341 const u8 *end, *pos;
1342
1343 if (res->beacon_ie_len == 0)
1344 return NULL;
1345
1346 pos = (const u8 *) (res + 1);
1347 pos += res->ie_len;
1348 end = pos + res->beacon_ie_len;
1349
1350 while (pos + 1 < end) {
1351 if (pos + 2 + pos[1] > end)
1352 break;
1353 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1354 vendor_type == WPA_GET_BE32(&pos[2]))
1355 return pos;
1356 pos += 2 + pos[1];
1357 }
1358
1359 return NULL;
1360 }
1361
1362
1363 /**
1364 * wpa_scan_get_vendor_ie_multi - Fetch vendor IE data from a scan result
1365 * @res: Scan result entry
1366 * @vendor_type: Vendor type (four octets starting the IE payload)
1367 * Returns: Pointer to the information element payload or %NULL if not found
1368 *
1369 * This function returns concatenated payload of possibly fragmented vendor
1370 * specific information elements in the scan result. The caller is responsible
1371 * for freeing the returned buffer.
1372 */
1373 struct wpabuf * wpa_scan_get_vendor_ie_multi(const struct wpa_scan_res *res,
1374 u32 vendor_type)
1375 {
1376 struct wpabuf *buf;
1377 const u8 *end, *pos;
1378
1379 buf = wpabuf_alloc(res->ie_len);
1380 if (buf == NULL)
1381 return NULL;
1382
1383 pos = (const u8 *) (res + 1);
1384 end = pos + res->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 wpabuf_put_data(buf, pos + 2 + 4, pos[1] - 4);
1392 pos += 2 + pos[1];
1393 }
1394
1395 if (wpabuf_len(buf) == 0) {
1396 wpabuf_free(buf);
1397 buf = NULL;
1398 }
1399
1400 return buf;
1401 }
1402
1403
1404 /*
1405 * Channels with a great SNR can operate at full rate. What is a great SNR?
1406 * This doc https://supportforums.cisco.com/docs/DOC-12954 says, "the general
1407 * rule of thumb is that any SNR above 20 is good." This one
1408 * http://www.cisco.com/en/US/tech/tk722/tk809/technologies_q_and_a_item09186a00805e9a96.shtml#qa23
1409 * recommends 25 as a minimum SNR for 54 Mbps data rate. 30 is chosen here as a
1410 * conservative value.
1411 */
1412 #define GREAT_SNR 30
1413
1414 /* Compare function for sorting scan results. Return >0 if @b is considered
1415 * better. */
1416 static int wpa_scan_result_compar(const void *a, const void *b)
1417 {
1418 #define IS_5GHZ(n) (n > 4000)
1419 #define MIN(a,b) a < b ? a : b
1420 struct wpa_scan_res **_wa = (void *) a;
1421 struct wpa_scan_res **_wb = (void *) b;
1422 struct wpa_scan_res *wa = *_wa;
1423 struct wpa_scan_res *wb = *_wb;
1424 int wpa_a, wpa_b, maxrate_a, maxrate_b;
1425 int snr_a, snr_b;
1426
1427 /* WPA/WPA2 support preferred */
1428 wpa_a = wpa_scan_get_vendor_ie(wa, WPA_IE_VENDOR_TYPE) != NULL ||
1429 wpa_scan_get_ie(wa, WLAN_EID_RSN) != NULL;
1430 wpa_b = wpa_scan_get_vendor_ie(wb, WPA_IE_VENDOR_TYPE) != NULL ||
1431 wpa_scan_get_ie(wb, WLAN_EID_RSN) != NULL;
1432
1433 if (wpa_b && !wpa_a)
1434 return 1;
1435 if (!wpa_b && wpa_a)
1436 return -1;
1437
1438 /* privacy support preferred */
1439 if ((wa->caps & IEEE80211_CAP_PRIVACY) == 0 &&
1440 (wb->caps & IEEE80211_CAP_PRIVACY))
1441 return 1;
1442 if ((wa->caps & IEEE80211_CAP_PRIVACY) &&
1443 (wb->caps & IEEE80211_CAP_PRIVACY) == 0)
1444 return -1;
1445
1446 if ((wa->flags & wb->flags & WPA_SCAN_LEVEL_DBM) &&
1447 !((wa->flags | wb->flags) & WPA_SCAN_NOISE_INVALID)) {
1448 snr_a = MIN(wa->level - wa->noise, GREAT_SNR);
1449 snr_b = MIN(wb->level - wb->noise, GREAT_SNR);
1450 } else {
1451 /* Not suitable information to calculate SNR, so use level */
1452 snr_a = wa->level;
1453 snr_b = wb->level;
1454 }
1455
1456 /* best/max rate preferred if SNR close enough */
1457 if ((snr_a && snr_b && abs(snr_b - snr_a) < 5) ||
1458 (wa->qual && wb->qual && abs(wb->qual - wa->qual) < 10)) {
1459 maxrate_a = wpa_scan_get_max_rate(wa);
1460 maxrate_b = wpa_scan_get_max_rate(wb);
1461 if (maxrate_a != maxrate_b)
1462 return maxrate_b - maxrate_a;
1463 if (IS_5GHZ(wa->freq) ^ IS_5GHZ(wb->freq))
1464 return IS_5GHZ(wa->freq) ? -1 : 1;
1465 }
1466
1467 /* use freq for channel preference */
1468
1469 /* all things being equal, use SNR; if SNRs are
1470 * identical, use quality values since some drivers may only report
1471 * that value and leave the signal level zero */
1472 if (snr_b == snr_a)
1473 return wb->qual - wa->qual;
1474 return snr_b - snr_a;
1475 #undef MIN
1476 #undef IS_5GHZ
1477 }
1478
1479
1480 #ifdef CONFIG_WPS
1481 /* Compare function for sorting scan results when searching a WPS AP for
1482 * provisioning. Return >0 if @b is considered better. */
1483 static int wpa_scan_result_wps_compar(const void *a, const void *b)
1484 {
1485 struct wpa_scan_res **_wa = (void *) a;
1486 struct wpa_scan_res **_wb = (void *) b;
1487 struct wpa_scan_res *wa = *_wa;
1488 struct wpa_scan_res *wb = *_wb;
1489 int uses_wps_a, uses_wps_b;
1490 struct wpabuf *wps_a, *wps_b;
1491 int res;
1492
1493 /* Optimization - check WPS IE existence before allocated memory and
1494 * doing full reassembly. */
1495 uses_wps_a = wpa_scan_get_vendor_ie(wa, WPS_IE_VENDOR_TYPE) != NULL;
1496 uses_wps_b = wpa_scan_get_vendor_ie(wb, WPS_IE_VENDOR_TYPE) != NULL;
1497 if (uses_wps_a && !uses_wps_b)
1498 return -1;
1499 if (!uses_wps_a && uses_wps_b)
1500 return 1;
1501
1502 if (uses_wps_a && uses_wps_b) {
1503 wps_a = wpa_scan_get_vendor_ie_multi(wa, WPS_IE_VENDOR_TYPE);
1504 wps_b = wpa_scan_get_vendor_ie_multi(wb, WPS_IE_VENDOR_TYPE);
1505 res = wps_ap_priority_compar(wps_a, wps_b);
1506 wpabuf_free(wps_a);
1507 wpabuf_free(wps_b);
1508 if (res)
1509 return res;
1510 }
1511
1512 /*
1513 * Do not use current AP security policy as a sorting criteria during
1514 * WPS provisioning step since the AP may get reconfigured at the
1515 * completion of provisioning.
1516 */
1517
1518 /* all things being equal, use signal level; if signal levels are
1519 * identical, use quality values since some drivers may only report
1520 * that value and leave the signal level zero */
1521 if (wb->level == wa->level)
1522 return wb->qual - wa->qual;
1523 return wb->level - wa->level;
1524 }
1525 #endif /* CONFIG_WPS */
1526
1527
1528 static void dump_scan_res(struct wpa_scan_results *scan_res)
1529 {
1530 #ifndef CONFIG_NO_STDOUT_DEBUG
1531 size_t i;
1532
1533 if (scan_res->res == NULL || scan_res->num == 0)
1534 return;
1535
1536 wpa_printf(MSG_EXCESSIVE, "Sorted scan results");
1537
1538 for (i = 0; i < scan_res->num; i++) {
1539 struct wpa_scan_res *r = scan_res->res[i];
1540 u8 *pos;
1541 if ((r->flags & (WPA_SCAN_LEVEL_DBM | WPA_SCAN_NOISE_INVALID))
1542 == WPA_SCAN_LEVEL_DBM) {
1543 int snr = r->level - r->noise;
1544 wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d "
1545 "noise=%d level=%d snr=%d%s flags=0x%x "
1546 "age=%u",
1547 MAC2STR(r->bssid), r->freq, r->qual,
1548 r->noise, r->level, snr,
1549 snr >= GREAT_SNR ? "*" : "", r->flags,
1550 r->age);
1551 } else {
1552 wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d "
1553 "noise=%d level=%d flags=0x%x age=%u",
1554 MAC2STR(r->bssid), r->freq, r->qual,
1555 r->noise, r->level, r->flags, r->age);
1556 }
1557 pos = (u8 *) (r + 1);
1558 if (r->ie_len)
1559 wpa_hexdump(MSG_EXCESSIVE, "IEs", pos, r->ie_len);
1560 pos += r->ie_len;
1561 if (r->beacon_ie_len)
1562 wpa_hexdump(MSG_EXCESSIVE, "Beacon IEs",
1563 pos, r->beacon_ie_len);
1564 }
1565 #endif /* CONFIG_NO_STDOUT_DEBUG */
1566 }
1567
1568
1569 /**
1570 * wpa_supplicant_filter_bssid_match - Is the specified BSSID allowed
1571 * @wpa_s: Pointer to wpa_supplicant data
1572 * @bssid: BSSID to check
1573 * Returns: 0 if the BSSID is filtered or 1 if not
1574 *
1575 * This function is used to filter out specific BSSIDs from scan reslts mainly
1576 * for testing purposes (SET bssid_filter ctrl_iface command).
1577 */
1578 int wpa_supplicant_filter_bssid_match(struct wpa_supplicant *wpa_s,
1579 const u8 *bssid)
1580 {
1581 size_t i;
1582
1583 if (wpa_s->bssid_filter == NULL)
1584 return 1;
1585
1586 for (i = 0; i < wpa_s->bssid_filter_count; i++) {
1587 if (os_memcmp(wpa_s->bssid_filter + i * ETH_ALEN, bssid,
1588 ETH_ALEN) == 0)
1589 return 1;
1590 }
1591
1592 return 0;
1593 }
1594
1595
1596 static void filter_scan_res(struct wpa_supplicant *wpa_s,
1597 struct wpa_scan_results *res)
1598 {
1599 size_t i, j;
1600
1601 if (wpa_s->bssid_filter == NULL)
1602 return;
1603
1604 for (i = 0, j = 0; i < res->num; i++) {
1605 if (wpa_supplicant_filter_bssid_match(wpa_s,
1606 res->res[i]->bssid)) {
1607 res->res[j++] = res->res[i];
1608 } else {
1609 os_free(res->res[i]);
1610 res->res[i] = NULL;
1611 }
1612 }
1613
1614 if (res->num != j) {
1615 wpa_printf(MSG_DEBUG, "Filtered out %d scan results",
1616 (int) (res->num - j));
1617 res->num = j;
1618 }
1619 }
1620
1621
1622 /**
1623 * wpa_supplicant_get_scan_results - Get scan results
1624 * @wpa_s: Pointer to wpa_supplicant data
1625 * @info: Information about what was scanned or %NULL if not available
1626 * @new_scan: Whether a new scan was performed
1627 * Returns: Scan results, %NULL on failure
1628 *
1629 * This function request the current scan results from the driver and updates
1630 * the local BSS list wpa_s->bss. The caller is responsible for freeing the
1631 * results with wpa_scan_results_free().
1632 */
1633 struct wpa_scan_results *
1634 wpa_supplicant_get_scan_results(struct wpa_supplicant *wpa_s,
1635 struct scan_info *info, int new_scan)
1636 {
1637 struct wpa_scan_results *scan_res;
1638 size_t i;
1639 int (*compar)(const void *, const void *) = wpa_scan_result_compar;
1640
1641 scan_res = wpa_drv_get_scan_results2(wpa_s);
1642 if (scan_res == NULL) {
1643 wpa_dbg(wpa_s, MSG_DEBUG, "Failed to get scan results");
1644 return NULL;
1645 }
1646 if (scan_res->fetch_time.sec == 0) {
1647 /*
1648 * Make sure we have a valid timestamp if the driver wrapper
1649 * does not set this.
1650 */
1651 os_get_reltime(&scan_res->fetch_time);
1652 }
1653 filter_scan_res(wpa_s, scan_res);
1654
1655 #ifdef CONFIG_WPS
1656 if (wpas_wps_searching(wpa_s)) {
1657 wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Order scan results with WPS "
1658 "provisioning rules");
1659 compar = wpa_scan_result_wps_compar;
1660 }
1661 #endif /* CONFIG_WPS */
1662
1663 qsort(scan_res->res, scan_res->num, sizeof(struct wpa_scan_res *),
1664 compar);
1665 dump_scan_res(scan_res);
1666
1667 wpa_bss_update_start(wpa_s);
1668 for (i = 0; i < scan_res->num; i++)
1669 wpa_bss_update_scan_res(wpa_s, scan_res->res[i],
1670 &scan_res->fetch_time);
1671 wpa_bss_update_end(wpa_s, info, new_scan);
1672
1673 return scan_res;
1674 }
1675
1676
1677 /**
1678 * wpa_supplicant_update_scan_results - Update scan results from the driver
1679 * @wpa_s: Pointer to wpa_supplicant data
1680 * Returns: 0 on success, -1 on failure
1681 *
1682 * This function updates the BSS table within wpa_supplicant based on the
1683 * currently available scan results from the driver without requesting a new
1684 * scan. This is used in cases where the driver indicates an association
1685 * (including roaming within ESS) and wpa_supplicant does not yet have the
1686 * needed information to complete the connection (e.g., to perform validation
1687 * steps in 4-way handshake).
1688 */
1689 int wpa_supplicant_update_scan_results(struct wpa_supplicant *wpa_s)
1690 {
1691 struct wpa_scan_results *scan_res;
1692 scan_res = wpa_supplicant_get_scan_results(wpa_s, NULL, 0);
1693 if (scan_res == NULL)
1694 return -1;
1695 wpa_scan_results_free(scan_res);
1696
1697 return 0;
1698 }
1699
1700
1701 /**
1702 * scan_only_handler - Reports scan results
1703 */
1704 void scan_only_handler(struct wpa_supplicant *wpa_s,
1705 struct wpa_scan_results *scan_res)
1706 {
1707 wpa_dbg(wpa_s, MSG_DEBUG, "Scan-only results received");
1708 if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
1709 wpa_s->manual_scan_use_id && wpa_s->own_scan_running) {
1710 wpa_msg_ctrl(wpa_s, MSG_INFO, WPA_EVENT_SCAN_RESULTS "id=%u",
1711 wpa_s->manual_scan_id);
1712 wpa_s->manual_scan_use_id = 0;
1713 } else {
1714 wpa_msg_ctrl(wpa_s, MSG_INFO, WPA_EVENT_SCAN_RESULTS);
1715 }
1716 wpas_notify_scan_results(wpa_s);
1717 wpas_notify_scan_done(wpa_s, 1);
1718 if (wpa_s->scan_work) {
1719 struct wpa_radio_work *work = wpa_s->scan_work;
1720 wpa_s->scan_work = NULL;
1721 radio_work_done(work);
1722 }
1723 }
1724
1725
1726 int wpas_scan_scheduled(struct wpa_supplicant *wpa_s)
1727 {
1728 return eloop_is_timeout_registered(wpa_supplicant_scan, wpa_s, NULL);
1729 }
1730
1731
1732 struct wpa_driver_scan_params *
1733 wpa_scan_clone_params(const struct wpa_driver_scan_params *src)
1734 {
1735 struct wpa_driver_scan_params *params;
1736 size_t i;
1737 u8 *n;
1738
1739 params = os_zalloc(sizeof(*params));
1740 if (params == NULL)
1741 return NULL;
1742
1743 for (i = 0; i < src->num_ssids; i++) {
1744 if (src->ssids[i].ssid) {
1745 n = os_malloc(src->ssids[i].ssid_len);
1746 if (n == NULL)
1747 goto failed;
1748 os_memcpy(n, src->ssids[i].ssid,
1749 src->ssids[i].ssid_len);
1750 params->ssids[i].ssid = n;
1751 params->ssids[i].ssid_len = src->ssids[i].ssid_len;
1752 }
1753 }
1754 params->num_ssids = src->num_ssids;
1755
1756 if (src->extra_ies) {
1757 n = os_malloc(src->extra_ies_len);
1758 if (n == NULL)
1759 goto failed;
1760 os_memcpy(n, src->extra_ies, src->extra_ies_len);
1761 params->extra_ies = n;
1762 params->extra_ies_len = src->extra_ies_len;
1763 }
1764
1765 if (src->freqs) {
1766 int len = int_array_len(src->freqs);
1767 params->freqs = os_malloc((len + 1) * sizeof(int));
1768 if (params->freqs == NULL)
1769 goto failed;
1770 os_memcpy(params->freqs, src->freqs, (len + 1) * sizeof(int));
1771 }
1772
1773 if (src->filter_ssids) {
1774 params->filter_ssids = os_malloc(sizeof(*params->filter_ssids) *
1775 src->num_filter_ssids);
1776 if (params->filter_ssids == NULL)
1777 goto failed;
1778 os_memcpy(params->filter_ssids, src->filter_ssids,
1779 sizeof(*params->filter_ssids) *
1780 src->num_filter_ssids);
1781 params->num_filter_ssids = src->num_filter_ssids;
1782 }
1783
1784 params->filter_rssi = src->filter_rssi;
1785 params->p2p_probe = src->p2p_probe;
1786 params->only_new_results = src->only_new_results;
1787
1788 return params;
1789
1790 failed:
1791 wpa_scan_free_params(params);
1792 return NULL;
1793 }
1794
1795
1796 void wpa_scan_free_params(struct wpa_driver_scan_params *params)
1797 {
1798 size_t i;
1799
1800 if (params == NULL)
1801 return;
1802
1803 for (i = 0; i < params->num_ssids; i++)
1804 os_free((u8 *) params->ssids[i].ssid);
1805 os_free((u8 *) params->extra_ies);
1806 os_free(params->freqs);
1807 os_free(params->filter_ssids);
1808 os_free(params);
1809 }
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