1 /*
2 * WPA Supplicant - Scanning
3 * Copyright (c) 2003-2010, 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 "config.h"
15 #include "wpa_supplicant_i.h"
16 #include "driver_i.h"
17 #include "wps_supplicant.h"
18 #include "p2p_supplicant.h"
19 #include "p2p/p2p.h"
20 #include "notify.h"
21 #include "bss.h"
22 #include "scan.h"
23
24
wpa_supplicant_gen_assoc_event(struct wpa_supplicant * wpa_s)25 static void wpa_supplicant_gen_assoc_event(struct wpa_supplicant *wpa_s)
26 {
27 struct wpa_ssid *ssid;
28 union wpa_event_data data;
29
30 ssid = wpa_supplicant_get_ssid(wpa_s);
31 if (ssid == NULL)
32 return;
33
34 if (wpa_s->current_ssid == NULL) {
35 wpa_s->current_ssid = ssid;
36 if (wpa_s->current_ssid != NULL)
37 wpas_notify_network_changed(wpa_s);
38 }
39 wpa_supplicant_initiate_eapol(wpa_s);
40 wpa_dbg(wpa_s, MSG_DEBUG, "Already associated with a configured "
41 "network - generating associated event");
42 os_memset(&data, 0, sizeof(data));
43 wpa_supplicant_event(wpa_s, EVENT_ASSOC, &data);
44 }
45
46
47 #ifdef CONFIG_WPS
wpas_wps_in_use(struct wpa_supplicant * wpa_s,enum wps_request_type * req_type)48 static int wpas_wps_in_use(struct wpa_supplicant *wpa_s,
49 enum wps_request_type *req_type)
50 {
51 struct wpa_ssid *ssid;
52 int wps = 0;
53
54 for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
55 if (!(ssid->key_mgmt & WPA_KEY_MGMT_WPS))
56 continue;
57
58 wps = 1;
59 *req_type = wpas_wps_get_req_type(ssid);
60 if (!ssid->eap.phase1)
61 continue;
62
63 if (os_strstr(ssid->eap.phase1, "pbc=1"))
64 return 2;
65 }
66
67 #ifdef CONFIG_P2P
68 if (!wpa_s->global->p2p_disabled && wpa_s->global->p2p) {
69 wpa_s->wps->dev.p2p = 1;
70 if (!wps) {
71 wps = 1;
72 *req_type = WPS_REQ_ENROLLEE_INFO;
73 }
74 }
75 #endif /* CONFIG_P2P */
76
77 return wps;
78 }
79 #endif /* CONFIG_WPS */
80
81
wpa_supplicant_enabled_networks(struct wpa_config * conf)82 int wpa_supplicant_enabled_networks(struct wpa_config *conf)
83 {
84 struct wpa_ssid *ssid = conf->ssid;
85 int count = 0;
86 while (ssid) {
87 if (!ssid->disabled)
88 count++;
89 ssid = ssid->next;
90 }
91 return count;
92 }
93
94
wpa_supplicant_assoc_try(struct wpa_supplicant * wpa_s,struct wpa_ssid * ssid)95 static void wpa_supplicant_assoc_try(struct wpa_supplicant *wpa_s,
96 struct wpa_ssid *ssid)
97 {
98 while (ssid) {
99 if (!ssid->disabled)
100 break;
101 ssid = ssid->next;
102 }
103
104 /* ap_scan=2 mode - try to associate with each SSID. */
105 if (ssid == NULL) {
106 wpa_dbg(wpa_s, MSG_DEBUG, "wpa_supplicant_assoc_try: Reached "
107 "end of scan list - go back to beginning");
108 wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
109 wpa_supplicant_req_scan(wpa_s, 0, 0);
110 return;
111 }
112 if (ssid->next) {
113 /* Continue from the next SSID on the next attempt. */
114 wpa_s->prev_scan_ssid = ssid;
115 } else {
116 /* Start from the beginning of the SSID list. */
117 wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
118 }
119 wpa_supplicant_associate(wpa_s, NULL, ssid);
120 }
121
122
int_array_len(const int * a)123 static int int_array_len(const int *a)
124 {
125 int i;
126 for (i = 0; a && a[i]; i++)
127 ;
128 return i;
129 }
130
131
int_array_concat(int ** res,const int * a)132 static void int_array_concat(int **res, const int *a)
133 {
134 int reslen, alen, i;
135 int *n;
136
137 reslen = int_array_len(*res);
138 alen = int_array_len(a);
139
140 n = os_realloc(*res, (reslen + alen + 1) * sizeof(int));
141 if (n == NULL) {
142 os_free(*res);
143 *res = NULL;
144 return;
145 }
146 for (i = 0; i <= alen; i++)
147 n[reslen + i] = a[i];
148 *res = n;
149 }
150
151
freq_cmp(const void * a,const void * b)152 static int freq_cmp(const void *a, const void *b)
153 {
154 int _a = *(int *) a;
155 int _b = *(int *) b;
156
157 if (_a == 0)
158 return 1;
159 if (_b == 0)
160 return -1;
161 return _a - _b;
162 }
163
164
int_array_sort_unique(int * a)165 static void int_array_sort_unique(int *a)
166 {
167 int alen;
168 int i, j;
169
170 if (a == NULL)
171 return;
172
173 alen = int_array_len(a);
174 qsort(a, alen, sizeof(int), freq_cmp);
175
176 i = 0;
177 j = 1;
178 while (a[i] && a[j]) {
179 if (a[i] == a[j]) {
180 j++;
181 continue;
182 }
183 a[++i] = a[j++];
184 }
185 if (a[i])
186 i++;
187 a[i] = 0;
188 }
189
190
wpa_supplicant_trigger_scan(struct wpa_supplicant * wpa_s,struct wpa_driver_scan_params * params)191 int wpa_supplicant_trigger_scan(struct wpa_supplicant *wpa_s,
192 struct wpa_driver_scan_params *params)
193 {
194 int ret;
195
196 wpa_supplicant_notify_scanning(wpa_s, 1);
197
198 ret = wpa_drv_scan(wpa_s, params);
199 if (ret) {
200 wpa_supplicant_notify_scanning(wpa_s, 0);
201 wpas_notify_scan_done(wpa_s, 0);
202 } else {
203 wpa_s->scan_runs++;
204 wpa_s->normal_scans++;
205 }
206
207 return ret;
208 }
209
210
211 static void
wpa_supplicant_delayed_sched_scan_timeout(void * eloop_ctx,void * timeout_ctx)212 wpa_supplicant_delayed_sched_scan_timeout(void *eloop_ctx, void *timeout_ctx)
213 {
214 struct wpa_supplicant *wpa_s = eloop_ctx;
215
216 wpa_dbg(wpa_s, MSG_DEBUG, "Starting delayed sched scan");
217
218 if (wpa_supplicant_req_sched_scan(wpa_s))
219 wpa_supplicant_req_scan(wpa_s, 0, 0);
220 }
221
222
223 static void
wpa_supplicant_sched_scan_timeout(void * eloop_ctx,void * timeout_ctx)224 wpa_supplicant_sched_scan_timeout(void *eloop_ctx, void *timeout_ctx)
225 {
226 struct wpa_supplicant *wpa_s = eloop_ctx;
227
228 wpa_dbg(wpa_s, MSG_DEBUG, "Sched scan timeout - stopping it");
229
230 wpa_s->sched_scan_timed_out = 1;
231 wpa_supplicant_cancel_sched_scan(wpa_s);
232 }
233
234
235 static int
wpa_supplicant_start_sched_scan(struct wpa_supplicant * wpa_s,struct wpa_driver_scan_params * params,int interval)236 wpa_supplicant_start_sched_scan(struct wpa_supplicant *wpa_s,
237 struct wpa_driver_scan_params *params,
238 int interval)
239 {
240 int ret;
241 #ifndef ANDROID_P2P
242 wpa_supplicant_notify_scanning(wpa_s, 1);
243 #endif
244 ret = wpa_drv_sched_scan(wpa_s, params, interval * 1000);
245 if (ret)
246 wpa_supplicant_notify_scanning(wpa_s, 0);
247 else {
248 wpa_s->sched_scanning = 1;
249 #ifdef ANDROID_P2P
250 wpa_supplicant_notify_scanning(wpa_s, 1);
251 #endif
252 }
253
254 return ret;
255 }
256
257
wpa_supplicant_stop_sched_scan(struct wpa_supplicant * wpa_s)258 static int wpa_supplicant_stop_sched_scan(struct wpa_supplicant *wpa_s)
259 {
260 int ret;
261
262 ret = wpa_drv_stop_sched_scan(wpa_s);
263 if (ret) {
264 wpa_dbg(wpa_s, MSG_DEBUG, "stopping sched_scan failed!");
265 /* TODO: what to do if stopping fails? */
266 return -1;
267 }
268
269 return ret;
270 }
271
272
273 static struct wpa_driver_scan_filter *
wpa_supplicant_build_filter_ssids(struct wpa_config * conf,size_t * num_ssids)274 wpa_supplicant_build_filter_ssids(struct wpa_config *conf, size_t *num_ssids)
275 {
276 struct wpa_driver_scan_filter *ssids;
277 struct wpa_ssid *ssid;
278 size_t count;
279
280 *num_ssids = 0;
281 if (!conf->filter_ssids)
282 return NULL;
283
284 for (count = 0, ssid = conf->ssid; ssid; ssid = ssid->next) {
285 if (ssid->ssid && ssid->ssid_len)
286 count++;
287 }
288 if (count == 0)
289 return NULL;
290 ssids = os_zalloc(count * sizeof(struct wpa_driver_scan_filter));
291 if (ssids == NULL)
292 return NULL;
293
294 for (ssid = conf->ssid; ssid; ssid = ssid->next) {
295 if (!ssid->ssid || !ssid->ssid_len)
296 continue;
297 os_memcpy(ssids[*num_ssids].ssid, ssid->ssid, ssid->ssid_len);
298 ssids[*num_ssids].ssid_len = ssid->ssid_len;
299 (*num_ssids)++;
300 }
301
302 return ssids;
303 }
304
305
wpa_supplicant_optimize_freqs(struct wpa_supplicant * wpa_s,struct wpa_driver_scan_params * params)306 static void wpa_supplicant_optimize_freqs(
307 struct wpa_supplicant *wpa_s, struct wpa_driver_scan_params *params)
308 {
309 #ifdef CONFIG_P2P
310 if (params->freqs == NULL && wpa_s->p2p_in_provisioning &&
311 wpa_s->go_params) {
312 /* Optimize provisioning state scan based on GO information */
313 if (wpa_s->p2p_in_provisioning < 5 &&
314 wpa_s->go_params->freq > 0) {
315 wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only GO "
316 "preferred frequency %d MHz",
317 wpa_s->go_params->freq);
318 params->freqs = os_zalloc(2 * sizeof(int));
319 if (params->freqs)
320 params->freqs[0] = wpa_s->go_params->freq;
321 } else if (wpa_s->p2p_in_provisioning < 8 &&
322 wpa_s->go_params->freq_list[0]) {
323 wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only common "
324 "channels");
325 int_array_concat(¶ms->freqs,
326 wpa_s->go_params->freq_list);
327 if (params->freqs)
328 int_array_sort_unique(params->freqs);
329 }
330 wpa_s->p2p_in_provisioning++;
331 }
332 #endif /* CONFIG_P2P */
333
334 #ifdef CONFIG_WPS
335 if (params->freqs == NULL && wpa_s->after_wps && wpa_s->wps_freq) {
336 /*
337 * Optimize post-provisioning scan based on channel used
338 * during provisioning.
339 */
340 wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Scan only frequency %u MHz "
341 "that was used during provisioning", wpa_s->wps_freq);
342 params->freqs = os_zalloc(2 * sizeof(int));
343 if (params->freqs)
344 params->freqs[0] = wpa_s->wps_freq;
345 wpa_s->after_wps--;
346 }
347
348 if (params->freqs == NULL && wpa_s->known_wps_freq && wpa_s->wps_freq)
349 {
350 /* Optimize provisioning scan based on already known channel */
351 wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Scan only frequency %u MHz",
352 wpa_s->wps_freq);
353 params->freqs = os_zalloc(2 * sizeof(int));
354 if (params->freqs)
355 params->freqs[0] = wpa_s->wps_freq;
356 wpa_s->known_wps_freq = 0; /* only do this once */
357 }
358 #endif /* CONFIG_WPS */
359 }
360
361
362 #ifdef CONFIG_INTERWORKING
wpas_add_interworking_elements(struct wpa_supplicant * wpa_s,struct wpabuf * buf)363 static void wpas_add_interworking_elements(struct wpa_supplicant *wpa_s,
364 struct wpabuf *buf)
365 {
366 if (wpa_s->conf->interworking == 0)
367 return;
368
369 wpabuf_put_u8(buf, WLAN_EID_EXT_CAPAB);
370 wpabuf_put_u8(buf, 4);
371 wpabuf_put_u8(buf, 0x00);
372 wpabuf_put_u8(buf, 0x00);
373 wpabuf_put_u8(buf, 0x00);
374 wpabuf_put_u8(buf, 0x80); /* Bit 31 - Interworking */
375
376 wpabuf_put_u8(buf, WLAN_EID_INTERWORKING);
377 wpabuf_put_u8(buf, is_zero_ether_addr(wpa_s->conf->hessid) ? 1 :
378 1 + ETH_ALEN);
379 wpabuf_put_u8(buf, wpa_s->conf->access_network_type);
380 /* No Venue Info */
381 if (!is_zero_ether_addr(wpa_s->conf->hessid))
382 wpabuf_put_data(buf, wpa_s->conf->hessid, ETH_ALEN);
383 }
384 #endif /* CONFIG_INTERWORKING */
385
386
387 static struct wpabuf *
wpa_supplicant_extra_ies(struct wpa_supplicant * wpa_s,struct wpa_driver_scan_params * params)388 wpa_supplicant_extra_ies(struct wpa_supplicant *wpa_s,
389 struct wpa_driver_scan_params *params)
390 {
391 struct wpabuf *extra_ie = NULL;
392 #ifdef CONFIG_WPS
393 int wps = 0;
394 enum wps_request_type req_type = WPS_REQ_ENROLLEE_INFO;
395 #endif /* CONFIG_WPS */
396
397 #ifdef CONFIG_INTERWORKING
398 if (wpa_s->conf->interworking &&
399 wpabuf_resize(&extra_ie, 100) == 0)
400 wpas_add_interworking_elements(wpa_s, extra_ie);
401 #endif /* CONFIG_INTERWORKING */
402
403 #ifdef CONFIG_WPS
404 wps = wpas_wps_in_use(wpa_s, &req_type);
405
406 if (wps) {
407 struct wpabuf *wps_ie;
408 wps_ie = wps_build_probe_req_ie(wps == 2, &wpa_s->wps->dev,
409 wpa_s->wps->uuid, req_type,
410 0, NULL);
411 if (wps_ie) {
412 if (wpabuf_resize(&extra_ie, wpabuf_len(wps_ie)) == 0)
413 wpabuf_put_buf(extra_ie, wps_ie);
414 wpabuf_free(wps_ie);
415 }
416 }
417
418 #ifdef CONFIG_P2P
419 if (wps) {
420 size_t ielen = p2p_scan_ie_buf_len(wpa_s->global->p2p);
421 if (wpabuf_resize(&extra_ie, ielen) == 0)
422 wpas_p2p_scan_ie(wpa_s, extra_ie);
423 }
424 #endif /* CONFIG_P2P */
425
426 #endif /* CONFIG_WPS */
427
428 return extra_ie;
429 }
430
431
wpa_supplicant_scan(void * eloop_ctx,void * timeout_ctx)432 static void wpa_supplicant_scan(void *eloop_ctx, void *timeout_ctx)
433 {
434 struct wpa_supplicant *wpa_s = eloop_ctx;
435 struct wpa_ssid *ssid;
436 int scan_req = 0, ret;
437 struct wpabuf *extra_ie;
438 struct wpa_driver_scan_params params;
439 size_t max_ssids;
440 enum wpa_states prev_state;
441
442 if (wpa_s->wpa_state == WPA_INTERFACE_DISABLED) {
443 wpa_dbg(wpa_s, MSG_DEBUG, "Skip scan - interface disabled");
444 return;
445 }
446
447 if (wpa_s->disconnected && !wpa_s->scan_req) {
448 wpa_supplicant_set_state(wpa_s, WPA_DISCONNECTED);
449 return;
450 }
451
452 if (!wpa_supplicant_enabled_networks(wpa_s->conf) &&
453 !wpa_s->scan_req) {
454 wpa_dbg(wpa_s, MSG_DEBUG, "No enabled networks - do not scan");
455 wpa_supplicant_set_state(wpa_s, WPA_INACTIVE);
456 return;
457 }
458
459 if (wpa_s->conf->ap_scan != 0 &&
460 (wpa_s->drv_flags & WPA_DRIVER_FLAGS_WIRED)) {
461 wpa_dbg(wpa_s, MSG_DEBUG, "Using wired authentication - "
462 "overriding ap_scan configuration");
463 wpa_s->conf->ap_scan = 0;
464 wpas_notify_ap_scan_changed(wpa_s);
465 }
466
467 if (wpa_s->conf->ap_scan == 0) {
468 wpa_supplicant_gen_assoc_event(wpa_s);
469 return;
470 }
471
472 #ifdef CONFIG_P2P
473 if (wpas_p2p_in_progress(wpa_s)) {
474 if (wpa_s->wpa_state == WPA_SCANNING) {
475 wpa_dbg(wpa_s, MSG_DEBUG, "Delay station mode scan "
476 "while P2P operation is in progress");
477 wpa_supplicant_req_scan(wpa_s, 5, 0);
478 } else {
479 wpa_dbg(wpa_s, MSG_DEBUG, "Do not request scan while "
480 "P2P operation is in progress");
481 }
482 return;
483 }
484 #endif /* CONFIG_P2P */
485
486 if (wpa_s->conf->ap_scan == 2)
487 max_ssids = 1;
488 else {
489 max_ssids = wpa_s->max_scan_ssids;
490 if (max_ssids > WPAS_MAX_SCAN_SSIDS)
491 max_ssids = WPAS_MAX_SCAN_SSIDS;
492 }
493
494 scan_req = wpa_s->scan_req;
495 wpa_s->scan_req = 0;
496
497 os_memset(¶ms, 0, sizeof(params));
498
499 prev_state = wpa_s->wpa_state;
500 if (wpa_s->wpa_state == WPA_DISCONNECTED ||
501 wpa_s->wpa_state == WPA_INACTIVE)
502 wpa_supplicant_set_state(wpa_s, WPA_SCANNING);
503
504 if (scan_req != 2 && wpa_s->connect_without_scan) {
505 for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
506 if (ssid == wpa_s->connect_without_scan)
507 break;
508 }
509 wpa_s->connect_without_scan = NULL;
510 if (ssid) {
511 wpa_printf(MSG_DEBUG, "Start a pre-selected network "
512 "without scan step");
513 wpa_supplicant_associate(wpa_s, NULL, ssid);
514 return;
515 }
516 }
517
518 /* Find the starting point from which to continue scanning */
519 ssid = wpa_s->conf->ssid;
520 if (wpa_s->prev_scan_ssid != WILDCARD_SSID_SCAN) {
521 while (ssid) {
522 if (ssid == wpa_s->prev_scan_ssid) {
523 ssid = ssid->next;
524 break;
525 }
526 ssid = ssid->next;
527 }
528 }
529
530 if (scan_req != 2 && wpa_s->conf->ap_scan == 2) {
531 wpa_s->connect_without_scan = NULL;
532 wpa_s->prev_scan_wildcard = 0;
533 wpa_supplicant_assoc_try(wpa_s, ssid);
534 return;
535 #ifndef ANDROID
536 } else if (wpa_s->conf->ap_scan == 2) {
537 /*
538 * User-initiated scan request in ap_scan == 2; scan with
539 * wildcard SSID.
540 */
541 ssid = NULL;
542 #endif
543 } else {
544 struct wpa_ssid *start = ssid, *tssid;
545 int freqs_set = 0;
546 if (ssid == NULL && max_ssids > 1)
547 ssid = wpa_s->conf->ssid;
548 while (ssid) {
549 if (!ssid->disabled && ssid->scan_ssid) {
550 wpa_hexdump_ascii(MSG_DEBUG, "Scan SSID",
551 ssid->ssid, ssid->ssid_len);
552 params.ssids[params.num_ssids].ssid =
553 ssid->ssid;
554 params.ssids[params.num_ssids].ssid_len =
555 ssid->ssid_len;
556 params.num_ssids++;
557 if (params.num_ssids + 1 >= max_ssids)
558 break;
559 }
560 ssid = ssid->next;
561 if (ssid == start)
562 break;
563 if (ssid == NULL && max_ssids > 1 &&
564 start != wpa_s->conf->ssid)
565 ssid = wpa_s->conf->ssid;
566 }
567
568 for (tssid = wpa_s->conf->ssid; tssid; tssid = tssid->next) {
569 if (tssid->disabled)
570 continue;
571 if ((params.freqs || !freqs_set) && tssid->scan_freq) {
572 int_array_concat(¶ms.freqs,
573 tssid->scan_freq);
574 } else {
575 os_free(params.freqs);
576 params.freqs = NULL;
577 }
578 freqs_set = 1;
579 }
580 int_array_sort_unique(params.freqs);
581 }
582
583 if (ssid && max_ssids == 1) {
584 /*
585 * If the driver is limited to 1 SSID at a time interleave
586 * wildcard SSID scans with specific SSID scans to avoid
587 * waiting a long time for a wildcard scan.
588 */
589 if (!wpa_s->prev_scan_wildcard) {
590 params.ssids[0].ssid = NULL;
591 params.ssids[0].ssid_len = 0;
592 wpa_s->prev_scan_wildcard = 1;
593 wpa_dbg(wpa_s, MSG_DEBUG, "Starting AP scan for "
594 "wildcard SSID (Interleave with specific)");
595 } else {
596 wpa_s->prev_scan_ssid = ssid;
597 wpa_s->prev_scan_wildcard = 0;
598 wpa_dbg(wpa_s, MSG_DEBUG,
599 "Starting AP scan for specific SSID: %s",
600 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
601 }
602 } else if (ssid) {
603 /* max_ssids > 1 */
604
605 wpa_s->prev_scan_ssid = ssid;
606 wpa_dbg(wpa_s, MSG_DEBUG, "Include wildcard SSID in "
607 "the scan request");
608 params.num_ssids++;
609 } else {
610 wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
611 params.num_ssids++;
612 wpa_dbg(wpa_s, MSG_DEBUG, "Starting AP scan for wildcard "
613 "SSID");
614 }
615
616 wpa_supplicant_optimize_freqs(wpa_s, ¶ms);
617 extra_ie = wpa_supplicant_extra_ies(wpa_s, ¶ms);
618
619 if (params.freqs == NULL && wpa_s->next_scan_freqs) {
620 wpa_dbg(wpa_s, MSG_DEBUG, "Optimize scan based on previously "
621 "generated frequency list");
622 params.freqs = wpa_s->next_scan_freqs;
623 } else
624 os_free(wpa_s->next_scan_freqs);
625 wpa_s->next_scan_freqs = NULL;
626
627 params.filter_ssids = wpa_supplicant_build_filter_ssids(
628 wpa_s->conf, ¶ms.num_filter_ssids);
629 if (extra_ie) {
630 params.extra_ies = wpabuf_head(extra_ie);
631 params.extra_ies_len = wpabuf_len(extra_ie);
632 }
633
634 #ifdef CONFIG_P2P
635 if (wpa_s->p2p_in_provisioning) {
636 /*
637 * The interface may not yet be in P2P mode, so we have to
638 * explicitly request P2P probe to disable CCK rates.
639 */
640 params.p2p_probe = 1;
641 }
642 #endif /* CONFIG_P2P */
643
644 ret = wpa_supplicant_trigger_scan(wpa_s, ¶ms);
645
646 wpabuf_free(extra_ie);
647 os_free(params.freqs);
648 os_free(params.filter_ssids);
649
650 if (ret) {
651 wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate AP scan");
652 if (prev_state != wpa_s->wpa_state)
653 wpa_supplicant_set_state(wpa_s, prev_state);
654 wpa_supplicant_req_scan(wpa_s, 1, 0);
655 }
656 }
657
658
659 /**
660 * wpa_supplicant_req_scan - Schedule a scan for neighboring access points
661 * @wpa_s: Pointer to wpa_supplicant data
662 * @sec: Number of seconds after which to scan
663 * @usec: Number of microseconds after which to scan
664 *
665 * This function is used to schedule a scan for neighboring access points after
666 * the specified time.
667 */
wpa_supplicant_req_scan(struct wpa_supplicant * wpa_s,int sec,int usec)668 void wpa_supplicant_req_scan(struct wpa_supplicant *wpa_s, int sec, int usec)
669 {
670 #ifndef ANDROID
671 /* If there's at least one network that should be specifically scanned
672 * then don't cancel the scan and reschedule. Some drivers do
673 * background scanning which generates frequent scan results, and that
674 * causes the specific SSID scan to get continually pushed back and
675 * never happen, which causes hidden APs to never get probe-scanned.
676 */
677 if (eloop_is_timeout_registered(wpa_supplicant_scan, wpa_s, NULL) &&
678 wpa_s->conf->ap_scan == 1) {
679 struct wpa_ssid *ssid = wpa_s->conf->ssid;
680
681 while (ssid) {
682 if (!ssid->disabled && ssid->scan_ssid)
683 break;
684 ssid = ssid->next;
685 }
686 if (ssid) {
687 wpa_dbg(wpa_s, MSG_DEBUG, "Not rescheduling scan to "
688 "ensure that specific SSID scans occur");
689 return;
690 }
691 }
692 #endif
693 wpa_dbg(wpa_s, MSG_DEBUG, "Setting scan request: %d sec %d usec",
694 sec, usec);
695 eloop_cancel_timeout(wpa_supplicant_scan, wpa_s, NULL);
696 eloop_register_timeout(sec, usec, wpa_supplicant_scan, wpa_s, NULL);
697 }
698
699
700 /**
701 * wpa_supplicant_delayed_sched_scan - Request a delayed scheduled scan
702 * @wpa_s: Pointer to wpa_supplicant data
703 * @sec: Number of seconds after which to scan
704 * @usec: Number of microseconds after which to scan
705 *
706 * This function is used to schedule periodic scans for neighboring
707 * access points after the specified time.
708 */
wpa_supplicant_delayed_sched_scan(struct wpa_supplicant * wpa_s,int sec,int usec)709 int wpa_supplicant_delayed_sched_scan(struct wpa_supplicant *wpa_s,
710 int sec, int usec)
711 {
712 if (!wpa_s->sched_scan_supported)
713 return -1;
714
715 eloop_register_timeout(sec, usec,
716 wpa_supplicant_delayed_sched_scan_timeout,
717 wpa_s, NULL);
718
719 return 0;
720 }
721
722
723 /**
724 * wpa_supplicant_req_sched_scan - Start a periodic scheduled scan
725 * @wpa_s: Pointer to wpa_supplicant data
726 *
727 * This function is used to schedule periodic scans for neighboring
728 * access points repeating the scan continuously.
729 */
wpa_supplicant_req_sched_scan(struct wpa_supplicant * wpa_s)730 int wpa_supplicant_req_sched_scan(struct wpa_supplicant *wpa_s)
731 {
732 struct wpa_driver_scan_params params;
733 enum wpa_states prev_state;
734 struct wpa_ssid *ssid;
735 struct wpabuf *wps_ie = NULL;
736 int ret;
737 unsigned int max_sched_scan_ssids;
738 int wildcard = 0;
739 int need_ssids;
740
741 if (!wpa_s->sched_scan_supported)
742 return -1;
743
744 if (wpa_s->max_sched_scan_ssids > WPAS_MAX_SCAN_SSIDS)
745 max_sched_scan_ssids = WPAS_MAX_SCAN_SSIDS;
746 else
747 max_sched_scan_ssids = wpa_s->max_sched_scan_ssids;
748 if (max_sched_scan_ssids < 1)
749 return -1;
750
751 if (wpa_s->sched_scanning) {
752 wpa_dbg(wpa_s, MSG_DEBUG, "Already sched scanning");
753 return 0;
754 }
755
756 need_ssids = 0;
757 for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
758 if (!ssid->disabled && !ssid->scan_ssid) {
759 /* Use wildcard SSID to find this network */
760 wildcard = 1;
761 } else if (!ssid->disabled && ssid->ssid_len)
762 need_ssids++;
763 }
764 if (wildcard)
765 need_ssids++;
766
767 if (wpa_s->normal_scans < 3 &&
768 (need_ssids <= wpa_s->max_scan_ssids ||
769 wpa_s->max_scan_ssids >= (int) max_sched_scan_ssids)) {
770 /*
771 * When normal scan can speed up operations, use that for the
772 * first operations before starting the sched_scan to allow
773 * user space sleep more. We do this only if the normal scan
774 * has functionality that is suitable for this or if the
775 * sched_scan does not have better support for multiple SSIDs.
776 */
777 wpa_dbg(wpa_s, MSG_DEBUG, "Use normal scan instead of "
778 "sched_scan for initial scans (normal_scans=%d)",
779 wpa_s->normal_scans);
780 return -1;
781 }
782
783 os_memset(¶ms, 0, sizeof(params));
784
785 /* If we can't allocate space for the filters, we just don't filter */
786 params.filter_ssids = os_zalloc(wpa_s->max_match_sets *
787 sizeof(struct wpa_driver_scan_filter));
788
789 prev_state = wpa_s->wpa_state;
790 #ifndef ANDROID_P2P
791 if (wpa_s->wpa_state == WPA_DISCONNECTED ||
792 wpa_s->wpa_state == WPA_INACTIVE)
793 wpa_supplicant_set_state(wpa_s, WPA_SCANNING);
794 #endif
795
796 /* Find the starting point from which to continue scanning */
797 ssid = wpa_s->conf->ssid;
798 if (wpa_s->prev_sched_ssid) {
799 while (ssid) {
800 if (ssid == wpa_s->prev_sched_ssid) {
801 ssid = ssid->next;
802 break;
803 }
804 ssid = ssid->next;
805 }
806 }
807
808 if (!ssid || !wpa_s->prev_sched_ssid) {
809 wpa_dbg(wpa_s, MSG_DEBUG, "Beginning of SSID list");
810
811 wpa_s->sched_scan_interval = 10;
812 wpa_s->sched_scan_timeout = max_sched_scan_ssids * 2;
813 wpa_s->first_sched_scan = 1;
814 ssid = wpa_s->conf->ssid;
815 wpa_s->prev_sched_ssid = ssid;
816 }
817
818 if (wildcard) {
819 wpa_dbg(wpa_s, MSG_DEBUG, "Add wildcard SSID to sched_scan");
820 params.num_ssids++;
821 }
822
823 while (ssid) {
824 if (ssid->disabled)
825 goto next;
826
827 if (params.num_filter_ssids < wpa_s->max_match_sets &&
828 params.filter_ssids && ssid->ssid && ssid->ssid_len) {
829 wpa_dbg(wpa_s, MSG_DEBUG, "add to filter ssid: %s",
830 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
831 os_memcpy(params.filter_ssids[params.num_filter_ssids].ssid,
832 ssid->ssid, ssid->ssid_len);
833 params.filter_ssids[params.num_filter_ssids].ssid_len =
834 ssid->ssid_len;
835 params.num_filter_ssids++;
836 } else if (params.filter_ssids && ssid->ssid && ssid->ssid_len)
837 {
838 wpa_dbg(wpa_s, MSG_DEBUG, "Not enough room for SSID "
839 "filter for sched_scan - drop filter");
840 os_free(params.filter_ssids);
841 params.filter_ssids = NULL;
842 params.num_filter_ssids = 0;
843 }
844
845 if (ssid->scan_ssid && ssid->ssid && ssid->ssid_len) {
846 if (params.num_ssids == max_sched_scan_ssids)
847 break; /* only room for broadcast SSID */
848 wpa_dbg(wpa_s, MSG_DEBUG,
849 "add to active scan ssid: %s",
850 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
851 params.ssids[params.num_ssids].ssid =
852 ssid->ssid;
853 params.ssids[params.num_ssids].ssid_len =
854 ssid->ssid_len;
855 params.num_ssids++;
856 if (params.num_ssids >= max_sched_scan_ssids) {
857 wpa_s->prev_sched_ssid = ssid;
858 break;
859 }
860 }
861
862 next:
863 wpa_s->prev_sched_ssid = ssid;
864 ssid = ssid->next;
865 }
866
867 if (params.num_filter_ssids == 0) {
868 os_free(params.filter_ssids);
869 params.filter_ssids = NULL;
870 }
871
872 if (wpa_s->wps)
873 wps_ie = wpa_supplicant_extra_ies(wpa_s, ¶ms);
874
875 if (ssid || !wpa_s->first_sched_scan) {
876 wpa_dbg(wpa_s, MSG_DEBUG,
877 "Starting sched scan: interval %d (no timeout)",
878 wpa_s->sched_scan_interval);
879 } else {
880 wpa_dbg(wpa_s, MSG_DEBUG,
881 "Starting sched scan: interval %d timeout %d",
882 wpa_s->sched_scan_interval, wpa_s->sched_scan_timeout);
883 }
884
885 ret = wpa_supplicant_start_sched_scan(wpa_s, ¶ms,
886 wpa_s->sched_scan_interval);
887 wpabuf_free(wps_ie);
888 os_free(params.filter_ssids);
889 if (ret) {
890 wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate sched scan");
891 if (prev_state != wpa_s->wpa_state)
892 wpa_supplicant_set_state(wpa_s, prev_state);
893 return ret;
894 }
895
896 /* If we have more SSIDs to scan, add a timeout so we scan them too */
897 if (ssid || !wpa_s->first_sched_scan) {
898 wpa_s->sched_scan_timed_out = 0;
899 eloop_register_timeout(wpa_s->sched_scan_timeout, 0,
900 wpa_supplicant_sched_scan_timeout,
901 wpa_s, NULL);
902 wpa_s->first_sched_scan = 0;
903 wpa_s->sched_scan_timeout /= 2;
904 wpa_s->sched_scan_interval *= 2;
905 }
906
907 return 0;
908 }
909
910
911 /**
912 * wpa_supplicant_cancel_scan - Cancel a scheduled scan request
913 * @wpa_s: Pointer to wpa_supplicant data
914 *
915 * This function is used to cancel a scan request scheduled with
916 * wpa_supplicant_req_scan().
917 */
wpa_supplicant_cancel_scan(struct wpa_supplicant * wpa_s)918 void wpa_supplicant_cancel_scan(struct wpa_supplicant *wpa_s)
919 {
920 wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling scan request");
921 eloop_cancel_timeout(wpa_supplicant_scan, wpa_s, NULL);
922 #ifdef ANDROID
923 wpa_supplicant_notify_scanning(wpa_s, 0);
924 #endif
925 }
926
927
928 /**
929 * wpa_supplicant_cancel_sched_scan - Stop running scheduled scans
930 * @wpa_s: Pointer to wpa_supplicant data
931 *
932 * This function is used to stop a periodic scheduled scan.
933 */
wpa_supplicant_cancel_sched_scan(struct wpa_supplicant * wpa_s)934 void wpa_supplicant_cancel_sched_scan(struct wpa_supplicant *wpa_s)
935 {
936 if (!wpa_s->sched_scanning)
937 return;
938
939 wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling sched scan");
940 eloop_cancel_timeout(wpa_supplicant_sched_scan_timeout, wpa_s, NULL);
941 wpa_supplicant_stop_sched_scan(wpa_s);
942 }
943
944
wpa_supplicant_notify_scanning(struct wpa_supplicant * wpa_s,int scanning)945 void wpa_supplicant_notify_scanning(struct wpa_supplicant *wpa_s,
946 int scanning)
947 {
948 if (wpa_s->scanning != scanning) {
949 #ifdef ANDROID_P2P
950 if(!wpa_s->sched_scanning)
951 wpa_s->scanning = scanning;
952 #else
953 wpa_s->scanning = scanning;
954 #endif
955 wpas_notify_scanning(wpa_s);
956 }
957 }
958
959
wpa_scan_get_max_rate(const struct wpa_scan_res * res)960 static int wpa_scan_get_max_rate(const struct wpa_scan_res *res)
961 {
962 int rate = 0;
963 const u8 *ie;
964 int i;
965
966 ie = wpa_scan_get_ie(res, WLAN_EID_SUPP_RATES);
967 for (i = 0; ie && i < ie[1]; i++) {
968 if ((ie[i + 2] & 0x7f) > rate)
969 rate = ie[i + 2] & 0x7f;
970 }
971
972 ie = wpa_scan_get_ie(res, WLAN_EID_EXT_SUPP_RATES);
973 for (i = 0; ie && i < ie[1]; i++) {
974 if ((ie[i + 2] & 0x7f) > rate)
975 rate = ie[i + 2] & 0x7f;
976 }
977
978 return rate;
979 }
980
981
wpa_scan_get_ie(const struct wpa_scan_res * res,u8 ie)982 const u8 * wpa_scan_get_ie(const struct wpa_scan_res *res, u8 ie)
983 {
984 const u8 *end, *pos;
985
986 pos = (const u8 *) (res + 1);
987 end = pos + res->ie_len;
988
989 while (pos + 1 < end) {
990 if (pos + 2 + pos[1] > end)
991 break;
992 if (pos[0] == ie)
993 return pos;
994 pos += 2 + pos[1];
995 }
996
997 return NULL;
998 }
999
1000
wpa_scan_get_vendor_ie(const struct wpa_scan_res * res,u32 vendor_type)1001 const u8 * wpa_scan_get_vendor_ie(const struct wpa_scan_res *res,
1002 u32 vendor_type)
1003 {
1004 const u8 *end, *pos;
1005
1006 pos = (const u8 *) (res + 1);
1007 end = pos + res->ie_len;
1008
1009 while (pos + 1 < end) {
1010 if (pos + 2 + pos[1] > end)
1011 break;
1012 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1013 vendor_type == WPA_GET_BE32(&pos[2]))
1014 return pos;
1015 pos += 2 + pos[1];
1016 }
1017
1018 return NULL;
1019 }
1020
1021
wpa_scan_get_vendor_ie_multi(const struct wpa_scan_res * res,u32 vendor_type)1022 struct wpabuf * wpa_scan_get_vendor_ie_multi(const struct wpa_scan_res *res,
1023 u32 vendor_type)
1024 {
1025 struct wpabuf *buf;
1026 const u8 *end, *pos;
1027
1028 buf = wpabuf_alloc(res->ie_len);
1029 if (buf == NULL)
1030 return NULL;
1031
1032 pos = (const u8 *) (res + 1);
1033 end = pos + res->ie_len;
1034
1035 while (pos + 1 < end) {
1036 if (pos + 2 + pos[1] > end)
1037 break;
1038 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1039 vendor_type == WPA_GET_BE32(&pos[2]))
1040 wpabuf_put_data(buf, pos + 2 + 4, pos[1] - 4);
1041 pos += 2 + pos[1];
1042 }
1043
1044 if (wpabuf_len(buf) == 0) {
1045 wpabuf_free(buf);
1046 buf = NULL;
1047 }
1048
1049 return buf;
1050 }
1051
1052
wpa_scan_get_vendor_ie_multi_beacon(const struct wpa_scan_res * res,u32 vendor_type)1053 struct wpabuf * wpa_scan_get_vendor_ie_multi_beacon(
1054 const struct wpa_scan_res *res, u32 vendor_type)
1055 {
1056 struct wpabuf *buf;
1057 const u8 *end, *pos;
1058
1059 if (res->beacon_ie_len == 0)
1060 return NULL;
1061 buf = wpabuf_alloc(res->beacon_ie_len);
1062 if (buf == NULL)
1063 return NULL;
1064
1065 pos = (const u8 *) (res + 1);
1066 pos += res->ie_len;
1067 end = pos + res->beacon_ie_len;
1068
1069 while (pos + 1 < end) {
1070 if (pos + 2 + pos[1] > end)
1071 break;
1072 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1073 vendor_type == WPA_GET_BE32(&pos[2]))
1074 wpabuf_put_data(buf, pos + 2 + 4, pos[1] - 4);
1075 pos += 2 + pos[1];
1076 }
1077
1078 if (wpabuf_len(buf) == 0) {
1079 wpabuf_free(buf);
1080 buf = NULL;
1081 }
1082
1083 return buf;
1084 }
1085
1086
1087 /*
1088 * Channels with a great SNR can operate at full rate. What is a great SNR?
1089 * This doc https://supportforums.cisco.com/docs/DOC-12954 says, "the general
1090 * rule of thumb is that any SNR above 20 is good." This one
1091 * http://www.cisco.com/en/US/tech/tk722/tk809/technologies_q_and_a_item09186a00805e9a96.shtml#qa23
1092 * recommends 25 as a minimum SNR for 54 Mbps data rate. 30 is chosen here as a
1093 * conservative value.
1094 */
1095 #define GREAT_SNR 30
1096
1097 /* Compare function for sorting scan results. Return >0 if @b is considered
1098 * better. */
wpa_scan_result_compar(const void * a,const void * b)1099 static int wpa_scan_result_compar(const void *a, const void *b)
1100 {
1101 #define IS_5GHZ(n) (n > 4000)
1102 #define MIN(a,b) a < b ? a : b
1103 struct wpa_scan_res **_wa = (void *) a;
1104 struct wpa_scan_res **_wb = (void *) b;
1105 struct wpa_scan_res *wa = *_wa;
1106 struct wpa_scan_res *wb = *_wb;
1107 int wpa_a, wpa_b, maxrate_a, maxrate_b;
1108 int snr_a, snr_b;
1109
1110 /* WPA/WPA2 support preferred */
1111 wpa_a = wpa_scan_get_vendor_ie(wa, WPA_IE_VENDOR_TYPE) != NULL ||
1112 wpa_scan_get_ie(wa, WLAN_EID_RSN) != NULL;
1113 wpa_b = wpa_scan_get_vendor_ie(wb, WPA_IE_VENDOR_TYPE) != NULL ||
1114 wpa_scan_get_ie(wb, WLAN_EID_RSN) != NULL;
1115
1116 if (wpa_b && !wpa_a)
1117 return 1;
1118 if (!wpa_b && wpa_a)
1119 return -1;
1120
1121 /* privacy support preferred */
1122 if ((wa->caps & IEEE80211_CAP_PRIVACY) == 0 &&
1123 (wb->caps & IEEE80211_CAP_PRIVACY))
1124 return 1;
1125 if ((wa->caps & IEEE80211_CAP_PRIVACY) &&
1126 (wb->caps & IEEE80211_CAP_PRIVACY) == 0)
1127 return -1;
1128
1129 if ((wa->flags & wb->flags & WPA_SCAN_LEVEL_DBM) &&
1130 !((wa->flags | wb->flags) & WPA_SCAN_NOISE_INVALID)) {
1131 snr_a = MIN(wa->level - wa->noise, GREAT_SNR);
1132 snr_b = MIN(wb->level - wb->noise, GREAT_SNR);
1133 } else {
1134 /* Not suitable information to calculate SNR, so use level */
1135 snr_a = wa->level;
1136 snr_b = wb->level;
1137 }
1138
1139 /* best/max rate preferred if SNR close enough */
1140 if ((snr_a && snr_b && abs(snr_b - snr_a) < 5) ||
1141 (wa->qual && wb->qual && abs(wb->qual - wa->qual) < 10)) {
1142 maxrate_a = wpa_scan_get_max_rate(wa);
1143 maxrate_b = wpa_scan_get_max_rate(wb);
1144 if (maxrate_a != maxrate_b)
1145 return maxrate_b - maxrate_a;
1146 if (IS_5GHZ(wa->freq) ^ IS_5GHZ(wb->freq))
1147 return IS_5GHZ(wa->freq) ? -1 : 1;
1148 }
1149
1150 /* use freq for channel preference */
1151
1152 /* all things being equal, use SNR; if SNRs are
1153 * identical, use quality values since some drivers may only report
1154 * that value and leave the signal level zero */
1155 if (snr_b == snr_a)
1156 return wb->qual - wa->qual;
1157 return snr_b - snr_a;
1158 #undef MIN
1159 #undef IS_5GHZ
1160 }
1161
1162
1163 #ifdef CONFIG_WPS
1164 /* Compare function for sorting scan results when searching a WPS AP for
1165 * provisioning. Return >0 if @b is considered better. */
wpa_scan_result_wps_compar(const void * a,const void * b)1166 static int wpa_scan_result_wps_compar(const void *a, const void *b)
1167 {
1168 struct wpa_scan_res **_wa = (void *) a;
1169 struct wpa_scan_res **_wb = (void *) b;
1170 struct wpa_scan_res *wa = *_wa;
1171 struct wpa_scan_res *wb = *_wb;
1172 int uses_wps_a, uses_wps_b;
1173 struct wpabuf *wps_a, *wps_b;
1174 int res;
1175
1176 /* Optimization - check WPS IE existence before allocated memory and
1177 * doing full reassembly. */
1178 uses_wps_a = wpa_scan_get_vendor_ie(wa, WPS_IE_VENDOR_TYPE) != NULL;
1179 uses_wps_b = wpa_scan_get_vendor_ie(wb, WPS_IE_VENDOR_TYPE) != NULL;
1180 if (uses_wps_a && !uses_wps_b)
1181 return -1;
1182 if (!uses_wps_a && uses_wps_b)
1183 return 1;
1184
1185 if (uses_wps_a && uses_wps_b) {
1186 wps_a = wpa_scan_get_vendor_ie_multi(wa, WPS_IE_VENDOR_TYPE);
1187 wps_b = wpa_scan_get_vendor_ie_multi(wb, WPS_IE_VENDOR_TYPE);
1188 res = wps_ap_priority_compar(wps_a, wps_b);
1189 wpabuf_free(wps_a);
1190 wpabuf_free(wps_b);
1191 if (res)
1192 return res;
1193 }
1194
1195 /*
1196 * Do not use current AP security policy as a sorting criteria during
1197 * WPS provisioning step since the AP may get reconfigured at the
1198 * completion of provisioning.
1199 */
1200
1201 /* all things being equal, use signal level; if signal levels are
1202 * identical, use quality values since some drivers may only report
1203 * that value and leave the signal level zero */
1204 if (wb->level == wa->level)
1205 return wb->qual - wa->qual;
1206 return wb->level - wa->level;
1207 }
1208 #endif /* CONFIG_WPS */
1209
1210
dump_scan_res(struct wpa_scan_results * scan_res)1211 static void dump_scan_res(struct wpa_scan_results *scan_res)
1212 {
1213 #ifndef CONFIG_NO_STDOUT_DEBUG
1214 size_t i;
1215
1216 if (scan_res->res == NULL || scan_res->num == 0)
1217 return;
1218
1219 wpa_printf(MSG_EXCESSIVE, "Sorted scan results");
1220
1221 for (i = 0; i < scan_res->num; i++) {
1222 struct wpa_scan_res *r = scan_res->res[i];
1223 if ((r->flags & (WPA_SCAN_LEVEL_DBM | WPA_SCAN_NOISE_INVALID))
1224 == WPA_SCAN_LEVEL_DBM) {
1225 int snr = r->level - r->noise;
1226 wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d "
1227 "noise=%d level=%d snr=%d%s flags=0x%x",
1228 MAC2STR(r->bssid), r->freq, r->qual,
1229 r->noise, r->level, snr,
1230 snr >= GREAT_SNR ? "*" : "", r->flags);
1231 } else {
1232 wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d "
1233 "noise=%d level=%d flags=0x%x",
1234 MAC2STR(r->bssid), r->freq, r->qual,
1235 r->noise, r->level, r->flags);
1236 }
1237 }
1238 #endif /* CONFIG_NO_STDOUT_DEBUG */
1239 }
1240
1241
1242 /**
1243 * wpa_supplicant_get_scan_results - Get scan results
1244 * @wpa_s: Pointer to wpa_supplicant data
1245 * @info: Information about what was scanned or %NULL if not available
1246 * @new_scan: Whether a new scan was performed
1247 * Returns: Scan results, %NULL on failure
1248 *
1249 * This function request the current scan results from the driver and updates
1250 * the local BSS list wpa_s->bss. The caller is responsible for freeing the
1251 * results with wpa_scan_results_free().
1252 */
1253 struct wpa_scan_results *
wpa_supplicant_get_scan_results(struct wpa_supplicant * wpa_s,struct scan_info * info,int new_scan)1254 wpa_supplicant_get_scan_results(struct wpa_supplicant *wpa_s,
1255 struct scan_info *info, int new_scan)
1256 {
1257 struct wpa_scan_results *scan_res;
1258 size_t i;
1259 int (*compar)(const void *, const void *) = wpa_scan_result_compar;
1260
1261 scan_res = wpa_drv_get_scan_results2(wpa_s);
1262 if (scan_res == NULL) {
1263 wpa_dbg(wpa_s, MSG_DEBUG, "Failed to get scan results");
1264 return NULL;
1265 }
1266
1267 #ifdef CONFIG_WPS
1268 if (wpas_wps_in_progress(wpa_s)) {
1269 wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Order scan results with WPS "
1270 "provisioning rules");
1271 compar = wpa_scan_result_wps_compar;
1272 }
1273 #endif /* CONFIG_WPS */
1274
1275 qsort(scan_res->res, scan_res->num, sizeof(struct wpa_scan_res *),
1276 compar);
1277 dump_scan_res(scan_res);
1278
1279 wpa_bss_update_start(wpa_s);
1280 for (i = 0; i < scan_res->num; i++)
1281 wpa_bss_update_scan_res(wpa_s, scan_res->res[i]);
1282 wpa_bss_update_end(wpa_s, info, new_scan);
1283
1284 return scan_res;
1285 }
1286
1287
wpa_supplicant_update_scan_results(struct wpa_supplicant * wpa_s)1288 int wpa_supplicant_update_scan_results(struct wpa_supplicant *wpa_s)
1289 {
1290 struct wpa_scan_results *scan_res;
1291 scan_res = wpa_supplicant_get_scan_results(wpa_s, NULL, 0);
1292 if (scan_res == NULL)
1293 return -1;
1294 wpa_scan_results_free(scan_res);
1295
1296 return 0;
1297 }
1298