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Change share_vif_oper_freq() to handle multiple freqs
[thirdparty/hostap.git] / wpa_supplicant / scan.c
1 /*
2 * WPA Supplicant - Scanning
3 * Copyright (c) 2003-2012, 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 int int_array_len(const int *a)
145 {
146 int i;
147 for (i = 0; a && a[i]; i++)
148 ;
149 return i;
150 }
151
152
153 static void int_array_concat(int **res, const int *a)
154 {
155 int reslen, alen, i;
156 int *n;
157
158 reslen = int_array_len(*res);
159 alen = int_array_len(a);
160
161 n = os_realloc_array(*res, reslen + alen + 1, sizeof(int));
162 if (n == NULL) {
163 os_free(*res);
164 *res = NULL;
165 return;
166 }
167 for (i = 0; i <= alen; i++)
168 n[reslen + i] = a[i];
169 *res = n;
170 }
171
172
173 static int freq_cmp(const void *a, const void *b)
174 {
175 int _a = *(int *) a;
176 int _b = *(int *) b;
177
178 if (_a == 0)
179 return 1;
180 if (_b == 0)
181 return -1;
182 return _a - _b;
183 }
184
185
186 static void int_array_sort_unique(int *a)
187 {
188 int alen;
189 int i, j;
190
191 if (a == NULL)
192 return;
193
194 alen = int_array_len(a);
195 qsort(a, alen, sizeof(int), freq_cmp);
196
197 i = 0;
198 j = 1;
199 while (a[i] && a[j]) {
200 if (a[i] == a[j]) {
201 j++;
202 continue;
203 }
204 a[++i] = a[j++];
205 }
206 if (a[i])
207 i++;
208 a[i] = 0;
209 }
210
211
212 /**
213 * wpa_supplicant_trigger_scan - Request driver to start a scan
214 * @wpa_s: Pointer to wpa_supplicant data
215 * @params: Scan parameters
216 * Returns: 0 on success, -1 on failure
217 */
218 int wpa_supplicant_trigger_scan(struct wpa_supplicant *wpa_s,
219 struct wpa_driver_scan_params *params)
220 {
221 int ret;
222
223 wpa_supplicant_notify_scanning(wpa_s, 1);
224
225 ret = wpa_drv_scan(wpa_s, params);
226 if (ret) {
227 wpa_supplicant_notify_scanning(wpa_s, 0);
228 wpas_notify_scan_done(wpa_s, 0);
229 } else {
230 os_get_time(&wpa_s->scan_trigger_time);
231 wpa_s->scan_runs++;
232 wpa_s->normal_scans++;
233 }
234
235 return ret;
236 }
237
238
239 static void
240 wpa_supplicant_delayed_sched_scan_timeout(void *eloop_ctx, void *timeout_ctx)
241 {
242 struct wpa_supplicant *wpa_s = eloop_ctx;
243
244 wpa_dbg(wpa_s, MSG_DEBUG, "Starting delayed sched scan");
245
246 if (wpa_supplicant_req_sched_scan(wpa_s))
247 wpa_supplicant_req_scan(wpa_s, 0, 0);
248 }
249
250
251 static void
252 wpa_supplicant_sched_scan_timeout(void *eloop_ctx, void *timeout_ctx)
253 {
254 struct wpa_supplicant *wpa_s = eloop_ctx;
255
256 wpa_dbg(wpa_s, MSG_DEBUG, "Sched scan timeout - stopping it");
257
258 wpa_s->sched_scan_timed_out = 1;
259 wpa_supplicant_cancel_sched_scan(wpa_s);
260 }
261
262
263 static int
264 wpa_supplicant_start_sched_scan(struct wpa_supplicant *wpa_s,
265 struct wpa_driver_scan_params *params,
266 int interval)
267 {
268 int ret;
269
270 wpa_supplicant_notify_scanning(wpa_s, 1);
271 ret = wpa_drv_sched_scan(wpa_s, params, interval * 1000);
272 if (ret)
273 wpa_supplicant_notify_scanning(wpa_s, 0);
274 else
275 wpa_s->sched_scanning = 1;
276
277 return ret;
278 }
279
280
281 static int wpa_supplicant_stop_sched_scan(struct wpa_supplicant *wpa_s)
282 {
283 int ret;
284
285 ret = wpa_drv_stop_sched_scan(wpa_s);
286 if (ret) {
287 wpa_dbg(wpa_s, MSG_DEBUG, "stopping sched_scan failed!");
288 /* TODO: what to do if stopping fails? */
289 return -1;
290 }
291
292 return ret;
293 }
294
295
296 static struct wpa_driver_scan_filter *
297 wpa_supplicant_build_filter_ssids(struct wpa_config *conf, size_t *num_ssids)
298 {
299 struct wpa_driver_scan_filter *ssids;
300 struct wpa_ssid *ssid;
301 size_t count;
302
303 *num_ssids = 0;
304 if (!conf->filter_ssids)
305 return NULL;
306
307 for (count = 0, ssid = conf->ssid; ssid; ssid = ssid->next) {
308 if (ssid->ssid && ssid->ssid_len)
309 count++;
310 }
311 if (count == 0)
312 return NULL;
313 ssids = os_zalloc(count * sizeof(struct wpa_driver_scan_filter));
314 if (ssids == NULL)
315 return NULL;
316
317 for (ssid = conf->ssid; ssid; ssid = ssid->next) {
318 if (!ssid->ssid || !ssid->ssid_len)
319 continue;
320 os_memcpy(ssids[*num_ssids].ssid, ssid->ssid, ssid->ssid_len);
321 ssids[*num_ssids].ssid_len = ssid->ssid_len;
322 (*num_ssids)++;
323 }
324
325 return ssids;
326 }
327
328
329 static void wpa_supplicant_optimize_freqs(
330 struct wpa_supplicant *wpa_s, struct wpa_driver_scan_params *params)
331 {
332 #ifdef CONFIG_P2P
333 if (params->freqs == NULL && wpa_s->p2p_in_provisioning &&
334 wpa_s->go_params) {
335 /* Optimize provisioning state scan based on GO information */
336 if (wpa_s->p2p_in_provisioning < 5 &&
337 wpa_s->go_params->freq > 0) {
338 wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only GO "
339 "preferred frequency %d MHz",
340 wpa_s->go_params->freq);
341 params->freqs = os_zalloc(2 * sizeof(int));
342 if (params->freqs)
343 params->freqs[0] = wpa_s->go_params->freq;
344 } else if (wpa_s->p2p_in_provisioning < 8 &&
345 wpa_s->go_params->freq_list[0]) {
346 wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only common "
347 "channels");
348 int_array_concat(&params->freqs,
349 wpa_s->go_params->freq_list);
350 if (params->freqs)
351 int_array_sort_unique(params->freqs);
352 }
353 wpa_s->p2p_in_provisioning++;
354 }
355 #endif /* CONFIG_P2P */
356
357 #ifdef CONFIG_WPS
358 if (params->freqs == NULL && wpa_s->after_wps && wpa_s->wps_freq) {
359 /*
360 * Optimize post-provisioning scan based on channel used
361 * during provisioning.
362 */
363 wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Scan only frequency %u MHz "
364 "that was used during provisioning", wpa_s->wps_freq);
365 params->freqs = os_zalloc(2 * sizeof(int));
366 if (params->freqs)
367 params->freqs[0] = wpa_s->wps_freq;
368 wpa_s->after_wps--;
369 }
370
371 if (params->freqs == NULL && wpa_s->known_wps_freq && wpa_s->wps_freq)
372 {
373 /* Optimize provisioning scan based on already known channel */
374 wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Scan only frequency %u MHz",
375 wpa_s->wps_freq);
376 params->freqs = os_zalloc(2 * sizeof(int));
377 if (params->freqs)
378 params->freqs[0] = wpa_s->wps_freq;
379 wpa_s->known_wps_freq = 0; /* only do this once */
380 }
381 #endif /* CONFIG_WPS */
382 }
383
384
385 #ifdef CONFIG_INTERWORKING
386 static void wpas_add_interworking_elements(struct wpa_supplicant *wpa_s,
387 struct wpabuf *buf)
388 {
389 if (wpa_s->conf->interworking == 0)
390 return;
391
392 wpabuf_put_u8(buf, WLAN_EID_EXT_CAPAB);
393 wpabuf_put_u8(buf, 4);
394 wpabuf_put_u8(buf, 0x00);
395 wpabuf_put_u8(buf, 0x00);
396 wpabuf_put_u8(buf, 0x00);
397 wpabuf_put_u8(buf, 0x80); /* Bit 31 - Interworking */
398
399 wpabuf_put_u8(buf, WLAN_EID_INTERWORKING);
400 wpabuf_put_u8(buf, is_zero_ether_addr(wpa_s->conf->hessid) ? 1 :
401 1 + ETH_ALEN);
402 wpabuf_put_u8(buf, wpa_s->conf->access_network_type);
403 /* No Venue Info */
404 if (!is_zero_ether_addr(wpa_s->conf->hessid))
405 wpabuf_put_data(buf, wpa_s->conf->hessid, ETH_ALEN);
406 }
407 #endif /* CONFIG_INTERWORKING */
408
409
410 static struct wpabuf * wpa_supplicant_extra_ies(struct wpa_supplicant *wpa_s)
411 {
412 struct wpabuf *extra_ie = NULL;
413 #ifdef CONFIG_WPS
414 int wps = 0;
415 enum wps_request_type req_type = WPS_REQ_ENROLLEE_INFO;
416 #endif /* CONFIG_WPS */
417
418 #ifdef CONFIG_INTERWORKING
419 if (wpa_s->conf->interworking &&
420 wpabuf_resize(&extra_ie, 100) == 0)
421 wpas_add_interworking_elements(wpa_s, extra_ie);
422 #endif /* CONFIG_INTERWORKING */
423
424 #ifdef CONFIG_WPS
425 wps = wpas_wps_in_use(wpa_s, &req_type);
426
427 if (wps) {
428 struct wpabuf *wps_ie;
429 wps_ie = wps_build_probe_req_ie(wps == 2 ? DEV_PW_PUSHBUTTON :
430 DEV_PW_DEFAULT,
431 &wpa_s->wps->dev,
432 wpa_s->wps->uuid, req_type,
433 0, NULL);
434 if (wps_ie) {
435 if (wpabuf_resize(&extra_ie, wpabuf_len(wps_ie)) == 0)
436 wpabuf_put_buf(extra_ie, wps_ie);
437 wpabuf_free(wps_ie);
438 }
439 }
440
441 #ifdef CONFIG_P2P
442 if (wps) {
443 size_t ielen = p2p_scan_ie_buf_len(wpa_s->global->p2p);
444 if (wpabuf_resize(&extra_ie, ielen) == 0)
445 wpas_p2p_scan_ie(wpa_s, extra_ie);
446 }
447 #endif /* CONFIG_P2P */
448
449 #endif /* CONFIG_WPS */
450
451 #ifdef CONFIG_HS20
452 if (wpa_s->conf->hs20 && wpabuf_resize(&extra_ie, 7) == 0)
453 wpas_hs20_add_indication(extra_ie);
454 #endif /* CONFIG_HS20 */
455
456 return extra_ie;
457 }
458
459
460 #ifdef CONFIG_P2P
461
462 /*
463 * Check whether there are any enabled networks or credentials that could be
464 * used for a non-P2P connection.
465 */
466 static int non_p2p_network_enabled(struct wpa_supplicant *wpa_s)
467 {
468 struct wpa_ssid *ssid;
469
470 for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
471 if (wpas_network_disabled(wpa_s, ssid))
472 continue;
473 if (!ssid->p2p_group)
474 return 1;
475 }
476
477 if (wpa_s->conf->cred && wpa_s->conf->interworking &&
478 wpa_s->conf->auto_interworking)
479 return 1;
480
481 return 0;
482 }
483
484 #endif /* CONFIG_P2P */
485
486
487 static struct hostapd_hw_modes * get_mode(struct hostapd_hw_modes *modes,
488 u16 num_modes,
489 enum hostapd_hw_mode mode)
490 {
491 u16 i;
492
493 for (i = 0; i < num_modes; i++) {
494 if (modes[i].mode == mode)
495 return &modes[i];
496 }
497
498 return NULL;
499 }
500
501
502 static void wpa_setband_scan_freqs_list(struct wpa_supplicant *wpa_s,
503 enum hostapd_hw_mode band,
504 struct wpa_driver_scan_params *params)
505 {
506 /* Include only supported channels for the specified band */
507 struct hostapd_hw_modes *mode;
508 int count, i;
509
510 mode = get_mode(wpa_s->hw.modes, wpa_s->hw.num_modes, band);
511 if (mode == NULL) {
512 /* No channels supported in this band - use empty list */
513 params->freqs = os_zalloc(sizeof(int));
514 return;
515 }
516
517 params->freqs = os_zalloc((mode->num_channels + 1) * sizeof(int));
518 if (params->freqs == NULL)
519 return;
520 for (count = 0, i = 0; i < mode->num_channels; i++) {
521 if (mode->channels[i].flag & HOSTAPD_CHAN_DISABLED)
522 continue;
523 params->freqs[count++] = mode->channels[i].freq;
524 }
525 }
526
527
528 static void wpa_setband_scan_freqs(struct wpa_supplicant *wpa_s,
529 struct wpa_driver_scan_params *params)
530 {
531 if (wpa_s->hw.modes == NULL)
532 return; /* unknown what channels the driver supports */
533 if (params->freqs)
534 return; /* already using a limited channel set */
535 if (wpa_s->setband == WPA_SETBAND_5G)
536 wpa_setband_scan_freqs_list(wpa_s, HOSTAPD_MODE_IEEE80211A,
537 params);
538 else if (wpa_s->setband == WPA_SETBAND_2G)
539 wpa_setband_scan_freqs_list(wpa_s, HOSTAPD_MODE_IEEE80211G,
540 params);
541 }
542
543
544 static void wpa_supplicant_scan(void *eloop_ctx, void *timeout_ctx)
545 {
546 struct wpa_supplicant *wpa_s = eloop_ctx;
547 struct wpa_ssid *ssid;
548 enum scan_req_type scan_req = NORMAL_SCAN_REQ;
549 int ret;
550 struct wpabuf *extra_ie = NULL;
551 struct wpa_driver_scan_params params;
552 struct wpa_driver_scan_params *scan_params;
553 size_t max_ssids;
554 enum wpa_states prev_state;
555
556 if (wpa_s->wpa_state == WPA_INTERFACE_DISABLED) {
557 wpa_dbg(wpa_s, MSG_DEBUG, "Skip scan - interface disabled");
558 wpas_p2p_continue_after_scan(wpa_s);
559 return;
560 }
561
562 if (wpa_s->disconnected && wpa_s->scan_req == NORMAL_SCAN_REQ) {
563 wpa_dbg(wpa_s, MSG_DEBUG, "Disconnected - do not scan");
564 wpa_supplicant_set_state(wpa_s, WPA_DISCONNECTED);
565 wpas_p2p_continue_after_scan(wpa_s);
566 return;
567 }
568
569 if (!wpa_supplicant_enabled_networks(wpa_s) &&
570 wpa_s->scan_req == NORMAL_SCAN_REQ) {
571 wpa_dbg(wpa_s, MSG_DEBUG, "No enabled networks - do not scan");
572 wpa_supplicant_set_state(wpa_s, WPA_INACTIVE);
573 wpas_p2p_continue_after_scan(wpa_s);
574 return;
575 }
576
577 if (wpa_s->conf->ap_scan != 0 &&
578 (wpa_s->drv_flags & WPA_DRIVER_FLAGS_WIRED)) {
579 wpa_dbg(wpa_s, MSG_DEBUG, "Using wired authentication - "
580 "overriding ap_scan configuration");
581 wpa_s->conf->ap_scan = 0;
582 wpas_notify_ap_scan_changed(wpa_s);
583 }
584
585 if (wpa_s->conf->ap_scan == 0) {
586 wpa_supplicant_gen_assoc_event(wpa_s);
587 return;
588 }
589
590 #ifdef CONFIG_P2P
591 if (wpas_p2p_in_progress(wpa_s) || wpas_wpa_is_in_progress(wpa_s)) {
592 if (wpa_s->sta_scan_pending &&
593 wpas_p2p_in_progress(wpa_s) == 2 &&
594 wpa_s->global->p2p_cb_on_scan_complete) {
595 wpa_dbg(wpa_s, MSG_DEBUG, "Process pending station "
596 "mode scan during P2P search");
597 } else {
598 wpa_dbg(wpa_s, MSG_DEBUG, "Delay station mode scan "
599 "while P2P operation is in progress");
600 wpa_s->sta_scan_pending = 1;
601 wpa_supplicant_req_scan(wpa_s, 5, 0);
602 return;
603 }
604 }
605 #endif /* CONFIG_P2P */
606
607 if (wpa_s->conf->ap_scan == 2)
608 max_ssids = 1;
609 else {
610 max_ssids = wpa_s->max_scan_ssids;
611 if (max_ssids > WPAS_MAX_SCAN_SSIDS)
612 max_ssids = WPAS_MAX_SCAN_SSIDS;
613 }
614
615 scan_req = wpa_s->scan_req;
616 wpa_s->scan_req = NORMAL_SCAN_REQ;
617
618 os_memset(&params, 0, sizeof(params));
619
620 prev_state = wpa_s->wpa_state;
621 if (wpa_s->wpa_state == WPA_DISCONNECTED ||
622 wpa_s->wpa_state == WPA_INACTIVE)
623 wpa_supplicant_set_state(wpa_s, WPA_SCANNING);
624
625 /*
626 * If autoscan has set its own scanning parameters
627 */
628 if (wpa_s->autoscan_params != NULL) {
629 scan_params = wpa_s->autoscan_params;
630 goto scan;
631 }
632
633 if (scan_req != MANUAL_SCAN_REQ && wpa_s->connect_without_scan) {
634 for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
635 if (ssid == wpa_s->connect_without_scan)
636 break;
637 }
638 wpa_s->connect_without_scan = NULL;
639 if (ssid) {
640 wpa_printf(MSG_DEBUG, "Start a pre-selected network "
641 "without scan step");
642 wpa_supplicant_associate(wpa_s, NULL, ssid);
643 return;
644 }
645 }
646
647 #ifdef CONFIG_P2P
648 if ((wpa_s->p2p_in_provisioning || wpa_s->show_group_started) &&
649 wpa_s->go_params) {
650 wpa_printf(MSG_DEBUG, "P2P: Use specific SSID for scan during "
651 "P2P group formation");
652 params.ssids[0].ssid = wpa_s->go_params->ssid;
653 params.ssids[0].ssid_len = wpa_s->go_params->ssid_len;
654 params.num_ssids = 1;
655 goto ssid_list_set;
656 }
657 #endif /* CONFIG_P2P */
658
659 /* Find the starting point from which to continue scanning */
660 ssid = wpa_s->conf->ssid;
661 if (wpa_s->prev_scan_ssid != WILDCARD_SSID_SCAN) {
662 while (ssid) {
663 if (ssid == wpa_s->prev_scan_ssid) {
664 ssid = ssid->next;
665 break;
666 }
667 ssid = ssid->next;
668 }
669 }
670
671 if (scan_req != MANUAL_SCAN_REQ && wpa_s->conf->ap_scan == 2) {
672 wpa_s->connect_without_scan = NULL;
673 wpa_s->prev_scan_wildcard = 0;
674 wpa_supplicant_assoc_try(wpa_s, ssid);
675 return;
676 } else if (wpa_s->conf->ap_scan == 2) {
677 /*
678 * User-initiated scan request in ap_scan == 2; scan with
679 * wildcard SSID.
680 */
681 ssid = NULL;
682 } else {
683 struct wpa_ssid *start = ssid, *tssid;
684 int freqs_set = 0;
685 if (ssid == NULL && max_ssids > 1)
686 ssid = wpa_s->conf->ssid;
687 while (ssid) {
688 if (!wpas_network_disabled(wpa_s, ssid) &&
689 ssid->scan_ssid) {
690 wpa_hexdump_ascii(MSG_DEBUG, "Scan SSID",
691 ssid->ssid, ssid->ssid_len);
692 params.ssids[params.num_ssids].ssid =
693 ssid->ssid;
694 params.ssids[params.num_ssids].ssid_len =
695 ssid->ssid_len;
696 params.num_ssids++;
697 if (params.num_ssids + 1 >= max_ssids)
698 break;
699 }
700 ssid = ssid->next;
701 if (ssid == start)
702 break;
703 if (ssid == NULL && max_ssids > 1 &&
704 start != wpa_s->conf->ssid)
705 ssid = wpa_s->conf->ssid;
706 }
707
708 for (tssid = wpa_s->conf->ssid; tssid; tssid = tssid->next) {
709 if (wpas_network_disabled(wpa_s, tssid))
710 continue;
711 if ((params.freqs || !freqs_set) && tssid->scan_freq) {
712 int_array_concat(&params.freqs,
713 tssid->scan_freq);
714 } else {
715 os_free(params.freqs);
716 params.freqs = NULL;
717 }
718 freqs_set = 1;
719 }
720 int_array_sort_unique(params.freqs);
721 }
722
723 if (ssid && max_ssids == 1) {
724 /*
725 * If the driver is limited to 1 SSID at a time interleave
726 * wildcard SSID scans with specific SSID scans to avoid
727 * waiting a long time for a wildcard scan.
728 */
729 if (!wpa_s->prev_scan_wildcard) {
730 params.ssids[0].ssid = NULL;
731 params.ssids[0].ssid_len = 0;
732 wpa_s->prev_scan_wildcard = 1;
733 wpa_dbg(wpa_s, MSG_DEBUG, "Starting AP scan for "
734 "wildcard SSID (Interleave with specific)");
735 } else {
736 wpa_s->prev_scan_ssid = ssid;
737 wpa_s->prev_scan_wildcard = 0;
738 wpa_dbg(wpa_s, MSG_DEBUG,
739 "Starting AP scan for specific SSID: %s",
740 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
741 }
742 } else if (ssid) {
743 /* max_ssids > 1 */
744
745 wpa_s->prev_scan_ssid = ssid;
746 wpa_dbg(wpa_s, MSG_DEBUG, "Include wildcard SSID in "
747 "the scan request");
748 params.num_ssids++;
749 } else {
750 wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
751 params.num_ssids++;
752 wpa_dbg(wpa_s, MSG_DEBUG, "Starting AP scan for wildcard "
753 "SSID");
754 }
755 #ifdef CONFIG_P2P
756 ssid_list_set:
757 #endif /* CONFIG_P2P */
758
759 wpa_supplicant_optimize_freqs(wpa_s, &params);
760 extra_ie = wpa_supplicant_extra_ies(wpa_s);
761
762 if (params.freqs == NULL && wpa_s->next_scan_freqs) {
763 wpa_dbg(wpa_s, MSG_DEBUG, "Optimize scan based on previously "
764 "generated frequency list");
765 params.freqs = wpa_s->next_scan_freqs;
766 } else
767 os_free(wpa_s->next_scan_freqs);
768 wpa_s->next_scan_freqs = NULL;
769 wpa_setband_scan_freqs(wpa_s, &params);
770
771 /* See if user specified frequencies. If so, scan only those. */
772 if (wpa_s->conf->freq_list && !params.freqs) {
773 wpa_dbg(wpa_s, MSG_DEBUG,
774 "Optimize scan based on conf->freq_list");
775 int_array_concat(&params.freqs, wpa_s->conf->freq_list);
776 }
777
778 /* Use current associated channel? */
779 if (wpa_s->conf->scan_cur_freq && !params.freqs) {
780 unsigned int num = wpa_s->num_multichan_concurrent;
781
782 params.freqs = os_calloc(num + 1, sizeof(int));
783 if (params.freqs) {
784 num = get_shared_radio_freqs(wpa_s, params.freqs, num);
785 if (num > 0) {
786 wpa_dbg(wpa_s, MSG_DEBUG, "Scan only the "
787 "current operating channels since "
788 "scan_cur_freq is enabled");
789 } else {
790 os_free(params.freqs);
791 params.freqs = NULL;
792 }
793 }
794 }
795
796 params.filter_ssids = wpa_supplicant_build_filter_ssids(
797 wpa_s->conf, &params.num_filter_ssids);
798 if (extra_ie) {
799 params.extra_ies = wpabuf_head(extra_ie);
800 params.extra_ies_len = wpabuf_len(extra_ie);
801 }
802
803 #ifdef CONFIG_P2P
804 if (wpa_s->p2p_in_provisioning ||
805 (wpa_s->show_group_started && wpa_s->go_params)) {
806 /*
807 * The interface may not yet be in P2P mode, so we have to
808 * explicitly request P2P probe to disable CCK rates.
809 */
810 params.p2p_probe = 1;
811 }
812 #endif /* CONFIG_P2P */
813
814 scan_params = &params;
815
816 scan:
817 #ifdef CONFIG_P2P
818 /*
819 * If the driver does not support multi-channel concurrency and a
820 * virtual interface that shares the same radio with the wpa_s interface
821 * is operating there may not be need to scan other channels apart from
822 * the current operating channel on the other virtual interface. Filter
823 * out other channels in case we are trying to find a connection for a
824 * station interface when we are not configured to prefer station
825 * connection and a concurrent operation is already in process.
826 */
827 if (wpa_s->scan_for_connection && scan_req == NORMAL_SCAN_REQ &&
828 !scan_params->freqs && !params.freqs &&
829 wpas_is_p2p_prioritized(wpa_s) &&
830 wpa_s->p2p_group_interface == NOT_P2P_GROUP_INTERFACE &&
831 non_p2p_network_enabled(wpa_s)) {
832 unsigned int num = wpa_s->num_multichan_concurrent;
833
834 params.freqs = os_calloc(num + 1, sizeof(int));
835 if (params.freqs) {
836 num = get_shared_radio_freqs(wpa_s, params.freqs, num);
837 if (num > 0 && num == wpa_s->num_multichan_concurrent) {
838 wpa_dbg(wpa_s, MSG_DEBUG, "Scan only the current operating channels since all channels are already used");
839 } else {
840 os_free(params.freqs);
841 params.freqs = NULL;
842 }
843 }
844 }
845 #endif /* CONFIG_P2P */
846
847 ret = wpa_supplicant_trigger_scan(wpa_s, scan_params);
848
849 wpabuf_free(extra_ie);
850 os_free(params.freqs);
851 os_free(params.filter_ssids);
852
853 if (ret) {
854 wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate AP scan");
855 if (prev_state != wpa_s->wpa_state)
856 wpa_supplicant_set_state(wpa_s, prev_state);
857 /* Restore scan_req since we will try to scan again */
858 wpa_s->scan_req = scan_req;
859 wpa_supplicant_req_scan(wpa_s, 1, 0);
860 } else {
861 wpa_s->scan_for_connection = 0;
862 }
863 }
864
865
866 void wpa_supplicant_update_scan_int(struct wpa_supplicant *wpa_s, int sec)
867 {
868 struct os_time remaining, new_int;
869 int cancelled;
870
871 cancelled = eloop_cancel_timeout_one(wpa_supplicant_scan, wpa_s, NULL,
872 &remaining);
873
874 new_int.sec = sec;
875 new_int.usec = 0;
876 if (cancelled && os_time_before(&remaining, &new_int)) {
877 new_int.sec = remaining.sec;
878 new_int.usec = remaining.usec;
879 }
880
881 eloop_register_timeout(new_int.sec, new_int.usec, wpa_supplicant_scan,
882 wpa_s, NULL);
883 wpa_s->scan_interval = sec;
884 }
885
886
887 /**
888 * wpa_supplicant_req_scan - Schedule a scan for neighboring access points
889 * @wpa_s: Pointer to wpa_supplicant data
890 * @sec: Number of seconds after which to scan
891 * @usec: Number of microseconds after which to scan
892 *
893 * This function is used to schedule a scan for neighboring access points after
894 * the specified time.
895 */
896 void wpa_supplicant_req_scan(struct wpa_supplicant *wpa_s, int sec, int usec)
897 {
898 /* If there's at least one network that should be specifically scanned
899 * then don't cancel the scan and reschedule. Some drivers do
900 * background scanning which generates frequent scan results, and that
901 * causes the specific SSID scan to get continually pushed back and
902 * never happen, which causes hidden APs to never get probe-scanned.
903 */
904 if (eloop_is_timeout_registered(wpa_supplicant_scan, wpa_s, NULL) &&
905 wpa_s->conf->ap_scan == 1) {
906 struct wpa_ssid *ssid = wpa_s->conf->ssid;
907
908 while (ssid) {
909 if (!wpas_network_disabled(wpa_s, ssid) &&
910 ssid->scan_ssid)
911 break;
912 ssid = ssid->next;
913 }
914 if (ssid) {
915 wpa_dbg(wpa_s, MSG_DEBUG, "Not rescheduling scan to "
916 "ensure that specific SSID scans occur");
917 return;
918 }
919 }
920
921 wpa_dbg(wpa_s, MSG_DEBUG, "Setting scan request: %d sec %d usec",
922 sec, usec);
923 eloop_cancel_timeout(wpa_supplicant_scan, wpa_s, NULL);
924 eloop_register_timeout(sec, usec, wpa_supplicant_scan, wpa_s, NULL);
925 }
926
927
928 /**
929 * wpa_supplicant_delayed_sched_scan - Request a delayed scheduled scan
930 * @wpa_s: Pointer to wpa_supplicant data
931 * @sec: Number of seconds after which to scan
932 * @usec: Number of microseconds after which to scan
933 * Returns: 0 on success or -1 otherwise
934 *
935 * This function is used to schedule periodic scans for neighboring
936 * access points after the specified time.
937 */
938 int wpa_supplicant_delayed_sched_scan(struct wpa_supplicant *wpa_s,
939 int sec, int usec)
940 {
941 if (!wpa_s->sched_scan_supported)
942 return -1;
943
944 eloop_register_timeout(sec, usec,
945 wpa_supplicant_delayed_sched_scan_timeout,
946 wpa_s, NULL);
947
948 return 0;
949 }
950
951
952 /**
953 * wpa_supplicant_req_sched_scan - Start a periodic scheduled scan
954 * @wpa_s: Pointer to wpa_supplicant data
955 * Returns: 0 is sched_scan was started or -1 otherwise
956 *
957 * This function is used to schedule periodic scans for neighboring
958 * access points repeating the scan continuously.
959 */
960 int wpa_supplicant_req_sched_scan(struct wpa_supplicant *wpa_s)
961 {
962 struct wpa_driver_scan_params params;
963 struct wpa_driver_scan_params *scan_params;
964 enum wpa_states prev_state;
965 struct wpa_ssid *ssid = NULL;
966 struct wpabuf *extra_ie = NULL;
967 int ret;
968 unsigned int max_sched_scan_ssids;
969 int wildcard = 0;
970 int need_ssids;
971
972 if (!wpa_s->sched_scan_supported)
973 return -1;
974
975 if (wpa_s->max_sched_scan_ssids > WPAS_MAX_SCAN_SSIDS)
976 max_sched_scan_ssids = WPAS_MAX_SCAN_SSIDS;
977 else
978 max_sched_scan_ssids = wpa_s->max_sched_scan_ssids;
979 if (max_sched_scan_ssids < 1 || wpa_s->conf->disable_scan_offload)
980 return -1;
981
982 if (wpa_s->sched_scanning) {
983 wpa_dbg(wpa_s, MSG_DEBUG, "Already sched scanning");
984 return 0;
985 }
986
987 need_ssids = 0;
988 for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
989 if (!wpas_network_disabled(wpa_s, ssid) && !ssid->scan_ssid) {
990 /* Use wildcard SSID to find this network */
991 wildcard = 1;
992 } else if (!wpas_network_disabled(wpa_s, ssid) &&
993 ssid->ssid_len)
994 need_ssids++;
995
996 #ifdef CONFIG_WPS
997 if (!wpas_network_disabled(wpa_s, ssid) &&
998 ssid->key_mgmt == WPA_KEY_MGMT_WPS) {
999 /*
1000 * Normal scan is more reliable and faster for WPS
1001 * operations and since these are for short periods of
1002 * time, the benefit of trying to use sched_scan would
1003 * be limited.
1004 */
1005 wpa_dbg(wpa_s, MSG_DEBUG, "Use normal scan instead of "
1006 "sched_scan for WPS");
1007 return -1;
1008 }
1009 #endif /* CONFIG_WPS */
1010 }
1011 if (wildcard)
1012 need_ssids++;
1013
1014 if (wpa_s->normal_scans < 3 &&
1015 (need_ssids <= wpa_s->max_scan_ssids ||
1016 wpa_s->max_scan_ssids >= (int) max_sched_scan_ssids)) {
1017 /*
1018 * When normal scan can speed up operations, use that for the
1019 * first operations before starting the sched_scan to allow
1020 * user space sleep more. We do this only if the normal scan
1021 * has functionality that is suitable for this or if the
1022 * sched_scan does not have better support for multiple SSIDs.
1023 */
1024 wpa_dbg(wpa_s, MSG_DEBUG, "Use normal scan instead of "
1025 "sched_scan for initial scans (normal_scans=%d)",
1026 wpa_s->normal_scans);
1027 return -1;
1028 }
1029
1030 os_memset(&params, 0, sizeof(params));
1031
1032 /* If we can't allocate space for the filters, we just don't filter */
1033 params.filter_ssids = os_zalloc(wpa_s->max_match_sets *
1034 sizeof(struct wpa_driver_scan_filter));
1035
1036 prev_state = wpa_s->wpa_state;
1037 if (wpa_s->wpa_state == WPA_DISCONNECTED ||
1038 wpa_s->wpa_state == WPA_INACTIVE)
1039 wpa_supplicant_set_state(wpa_s, WPA_SCANNING);
1040
1041 if (wpa_s->autoscan_params != NULL) {
1042 scan_params = wpa_s->autoscan_params;
1043 goto scan;
1044 }
1045
1046 /* Find the starting point from which to continue scanning */
1047 ssid = wpa_s->conf->ssid;
1048 if (wpa_s->prev_sched_ssid) {
1049 while (ssid) {
1050 if (ssid == wpa_s->prev_sched_ssid) {
1051 ssid = ssid->next;
1052 break;
1053 }
1054 ssid = ssid->next;
1055 }
1056 }
1057
1058 if (!ssid || !wpa_s->prev_sched_ssid) {
1059 wpa_dbg(wpa_s, MSG_DEBUG, "Beginning of SSID list");
1060 if (wpa_s->conf->sched_scan_interval)
1061 wpa_s->sched_scan_interval =
1062 wpa_s->conf->sched_scan_interval;
1063 if (wpa_s->sched_scan_interval == 0)
1064 wpa_s->sched_scan_interval = 10;
1065 wpa_s->sched_scan_timeout = max_sched_scan_ssids * 2;
1066 wpa_s->first_sched_scan = 1;
1067 ssid = wpa_s->conf->ssid;
1068 wpa_s->prev_sched_ssid = ssid;
1069 }
1070
1071 if (wildcard) {
1072 wpa_dbg(wpa_s, MSG_DEBUG, "Add wildcard SSID to sched_scan");
1073 params.num_ssids++;
1074 }
1075
1076 while (ssid) {
1077 if (wpas_network_disabled(wpa_s, ssid))
1078 goto next;
1079
1080 if (params.num_filter_ssids < wpa_s->max_match_sets &&
1081 params.filter_ssids && ssid->ssid && ssid->ssid_len) {
1082 wpa_dbg(wpa_s, MSG_DEBUG, "add to filter ssid: %s",
1083 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
1084 os_memcpy(params.filter_ssids[params.num_filter_ssids].ssid,
1085 ssid->ssid, ssid->ssid_len);
1086 params.filter_ssids[params.num_filter_ssids].ssid_len =
1087 ssid->ssid_len;
1088 params.num_filter_ssids++;
1089 } else if (params.filter_ssids && ssid->ssid && ssid->ssid_len)
1090 {
1091 wpa_dbg(wpa_s, MSG_DEBUG, "Not enough room for SSID "
1092 "filter for sched_scan - drop filter");
1093 os_free(params.filter_ssids);
1094 params.filter_ssids = NULL;
1095 params.num_filter_ssids = 0;
1096 }
1097
1098 if (ssid->scan_ssid && ssid->ssid && ssid->ssid_len) {
1099 if (params.num_ssids == max_sched_scan_ssids)
1100 break; /* only room for broadcast SSID */
1101 wpa_dbg(wpa_s, MSG_DEBUG,
1102 "add to active scan ssid: %s",
1103 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
1104 params.ssids[params.num_ssids].ssid =
1105 ssid->ssid;
1106 params.ssids[params.num_ssids].ssid_len =
1107 ssid->ssid_len;
1108 params.num_ssids++;
1109 if (params.num_ssids >= max_sched_scan_ssids) {
1110 wpa_s->prev_sched_ssid = ssid;
1111 do {
1112 ssid = ssid->next;
1113 } while (ssid &&
1114 (wpas_network_disabled(wpa_s, ssid) ||
1115 !ssid->scan_ssid));
1116 break;
1117 }
1118 }
1119
1120 next:
1121 wpa_s->prev_sched_ssid = ssid;
1122 ssid = ssid->next;
1123 }
1124
1125 if (params.num_filter_ssids == 0) {
1126 os_free(params.filter_ssids);
1127 params.filter_ssids = NULL;
1128 }
1129
1130 extra_ie = wpa_supplicant_extra_ies(wpa_s);
1131 if (extra_ie) {
1132 params.extra_ies = wpabuf_head(extra_ie);
1133 params.extra_ies_len = wpabuf_len(extra_ie);
1134 }
1135
1136 scan_params = &params;
1137
1138 scan:
1139 if (ssid || !wpa_s->first_sched_scan) {
1140 wpa_dbg(wpa_s, MSG_DEBUG,
1141 "Starting sched scan: interval %d timeout %d",
1142 wpa_s->sched_scan_interval, wpa_s->sched_scan_timeout);
1143 } else {
1144 wpa_dbg(wpa_s, MSG_DEBUG,
1145 "Starting sched scan: interval %d (no timeout)",
1146 wpa_s->sched_scan_interval);
1147 }
1148
1149 wpa_setband_scan_freqs(wpa_s, scan_params);
1150
1151 ret = wpa_supplicant_start_sched_scan(wpa_s, scan_params,
1152 wpa_s->sched_scan_interval);
1153 wpabuf_free(extra_ie);
1154 os_free(params.filter_ssids);
1155 if (ret) {
1156 wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate sched scan");
1157 if (prev_state != wpa_s->wpa_state)
1158 wpa_supplicant_set_state(wpa_s, prev_state);
1159 return ret;
1160 }
1161
1162 /* If we have more SSIDs to scan, add a timeout so we scan them too */
1163 if (ssid || !wpa_s->first_sched_scan) {
1164 wpa_s->sched_scan_timed_out = 0;
1165 eloop_register_timeout(wpa_s->sched_scan_timeout, 0,
1166 wpa_supplicant_sched_scan_timeout,
1167 wpa_s, NULL);
1168 wpa_s->first_sched_scan = 0;
1169 wpa_s->sched_scan_timeout /= 2;
1170 wpa_s->sched_scan_interval *= 2;
1171 if (wpa_s->sched_scan_timeout < wpa_s->sched_scan_interval) {
1172 wpa_s->sched_scan_interval = 10;
1173 wpa_s->sched_scan_timeout = max_sched_scan_ssids * 2;
1174 }
1175 }
1176
1177 /* If there is no more ssids, start next time from the beginning */
1178 if (!ssid)
1179 wpa_s->prev_sched_ssid = NULL;
1180
1181 return 0;
1182 }
1183
1184
1185 /**
1186 * wpa_supplicant_cancel_scan - Cancel a scheduled scan request
1187 * @wpa_s: Pointer to wpa_supplicant data
1188 *
1189 * This function is used to cancel a scan request scheduled with
1190 * wpa_supplicant_req_scan().
1191 */
1192 void wpa_supplicant_cancel_scan(struct wpa_supplicant *wpa_s)
1193 {
1194 wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling scan request");
1195 eloop_cancel_timeout(wpa_supplicant_scan, wpa_s, NULL);
1196 wpas_p2p_continue_after_scan(wpa_s);
1197 }
1198
1199
1200 /**
1201 * wpa_supplicant_cancel_delayed_sched_scan - Stop a delayed scheduled scan
1202 * @wpa_s: Pointer to wpa_supplicant data
1203 *
1204 * This function is used to stop a delayed scheduled scan.
1205 */
1206 void wpa_supplicant_cancel_delayed_sched_scan(struct wpa_supplicant *wpa_s)
1207 {
1208 if (!wpa_s->sched_scan_supported)
1209 return;
1210
1211 wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling delayed sched scan");
1212 eloop_cancel_timeout(wpa_supplicant_delayed_sched_scan_timeout,
1213 wpa_s, NULL);
1214 }
1215
1216
1217 /**
1218 * wpa_supplicant_cancel_sched_scan - Stop running scheduled scans
1219 * @wpa_s: Pointer to wpa_supplicant data
1220 *
1221 * This function is used to stop a periodic scheduled scan.
1222 */
1223 void wpa_supplicant_cancel_sched_scan(struct wpa_supplicant *wpa_s)
1224 {
1225 if (!wpa_s->sched_scanning)
1226 return;
1227
1228 wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling sched scan");
1229 eloop_cancel_timeout(wpa_supplicant_sched_scan_timeout, wpa_s, NULL);
1230 wpa_supplicant_stop_sched_scan(wpa_s);
1231 }
1232
1233
1234 /**
1235 * wpa_supplicant_notify_scanning - Indicate possible scan state change
1236 * @wpa_s: Pointer to wpa_supplicant data
1237 * @scanning: Whether scanning is currently in progress
1238 *
1239 * This function is to generate scanning notifycations. It is called whenever
1240 * there may have been a change in scanning (scan started, completed, stopped).
1241 * wpas_notify_scanning() is called whenever the scanning state changed from the
1242 * previously notified state.
1243 */
1244 void wpa_supplicant_notify_scanning(struct wpa_supplicant *wpa_s,
1245 int scanning)
1246 {
1247 if (wpa_s->scanning != scanning) {
1248 wpa_s->scanning = scanning;
1249 wpas_notify_scanning(wpa_s);
1250 }
1251 }
1252
1253
1254 static int wpa_scan_get_max_rate(const struct wpa_scan_res *res)
1255 {
1256 int rate = 0;
1257 const u8 *ie;
1258 int i;
1259
1260 ie = wpa_scan_get_ie(res, WLAN_EID_SUPP_RATES);
1261 for (i = 0; ie && i < ie[1]; i++) {
1262 if ((ie[i + 2] & 0x7f) > rate)
1263 rate = ie[i + 2] & 0x7f;
1264 }
1265
1266 ie = wpa_scan_get_ie(res, WLAN_EID_EXT_SUPP_RATES);
1267 for (i = 0; ie && i < ie[1]; i++) {
1268 if ((ie[i + 2] & 0x7f) > rate)
1269 rate = ie[i + 2] & 0x7f;
1270 }
1271
1272 return rate;
1273 }
1274
1275
1276 /**
1277 * wpa_scan_get_ie - Fetch a specified information element from a scan result
1278 * @res: Scan result entry
1279 * @ie: Information element identitifier (WLAN_EID_*)
1280 * Returns: Pointer to the information element (id field) or %NULL if not found
1281 *
1282 * This function returns the first matching information element in the scan
1283 * result.
1284 */
1285 const u8 * wpa_scan_get_ie(const struct wpa_scan_res *res, u8 ie)
1286 {
1287 const u8 *end, *pos;
1288
1289 pos = (const u8 *) (res + 1);
1290 end = pos + res->ie_len;
1291
1292 while (pos + 1 < end) {
1293 if (pos + 2 + pos[1] > end)
1294 break;
1295 if (pos[0] == ie)
1296 return pos;
1297 pos += 2 + pos[1];
1298 }
1299
1300 return NULL;
1301 }
1302
1303
1304 /**
1305 * wpa_scan_get_vendor_ie - Fetch vendor information element from a scan result
1306 * @res: Scan result entry
1307 * @vendor_type: Vendor type (four octets starting the IE payload)
1308 * Returns: Pointer to the information element (id field) or %NULL if not found
1309 *
1310 * This function returns the first matching information element in the scan
1311 * result.
1312 */
1313 const u8 * wpa_scan_get_vendor_ie(const struct wpa_scan_res *res,
1314 u32 vendor_type)
1315 {
1316 const u8 *end, *pos;
1317
1318 pos = (const u8 *) (res + 1);
1319 end = pos + res->ie_len;
1320
1321 while (pos + 1 < end) {
1322 if (pos + 2 + pos[1] > end)
1323 break;
1324 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1325 vendor_type == WPA_GET_BE32(&pos[2]))
1326 return pos;
1327 pos += 2 + pos[1];
1328 }
1329
1330 return NULL;
1331 }
1332
1333
1334 /**
1335 * wpa_scan_get_vendor_ie_multi - Fetch vendor IE data from a scan result
1336 * @res: Scan result entry
1337 * @vendor_type: Vendor type (four octets starting the IE payload)
1338 * Returns: Pointer to the information element payload or %NULL if not found
1339 *
1340 * This function returns concatenated payload of possibly fragmented vendor
1341 * specific information elements in the scan result. The caller is responsible
1342 * for freeing the returned buffer.
1343 */
1344 struct wpabuf * wpa_scan_get_vendor_ie_multi(const struct wpa_scan_res *res,
1345 u32 vendor_type)
1346 {
1347 struct wpabuf *buf;
1348 const u8 *end, *pos;
1349
1350 buf = wpabuf_alloc(res->ie_len);
1351 if (buf == NULL)
1352 return NULL;
1353
1354 pos = (const u8 *) (res + 1);
1355 end = pos + res->ie_len;
1356
1357 while (pos + 1 < end) {
1358 if (pos + 2 + pos[1] > end)
1359 break;
1360 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1361 vendor_type == WPA_GET_BE32(&pos[2]))
1362 wpabuf_put_data(buf, pos + 2 + 4, pos[1] - 4);
1363 pos += 2 + pos[1];
1364 }
1365
1366 if (wpabuf_len(buf) == 0) {
1367 wpabuf_free(buf);
1368 buf = NULL;
1369 }
1370
1371 return buf;
1372 }
1373
1374
1375 /*
1376 * Channels with a great SNR can operate at full rate. What is a great SNR?
1377 * This doc https://supportforums.cisco.com/docs/DOC-12954 says, "the general
1378 * rule of thumb is that any SNR above 20 is good." This one
1379 * http://www.cisco.com/en/US/tech/tk722/tk809/technologies_q_and_a_item09186a00805e9a96.shtml#qa23
1380 * recommends 25 as a minimum SNR for 54 Mbps data rate. 30 is chosen here as a
1381 * conservative value.
1382 */
1383 #define GREAT_SNR 30
1384
1385 /* Compare function for sorting scan results. Return >0 if @b is considered
1386 * better. */
1387 static int wpa_scan_result_compar(const void *a, const void *b)
1388 {
1389 #define IS_5GHZ(n) (n > 4000)
1390 #define MIN(a,b) a < b ? a : b
1391 struct wpa_scan_res **_wa = (void *) a;
1392 struct wpa_scan_res **_wb = (void *) b;
1393 struct wpa_scan_res *wa = *_wa;
1394 struct wpa_scan_res *wb = *_wb;
1395 int wpa_a, wpa_b, maxrate_a, maxrate_b;
1396 int snr_a, snr_b;
1397
1398 /* WPA/WPA2 support preferred */
1399 wpa_a = wpa_scan_get_vendor_ie(wa, WPA_IE_VENDOR_TYPE) != NULL ||
1400 wpa_scan_get_ie(wa, WLAN_EID_RSN) != NULL;
1401 wpa_b = wpa_scan_get_vendor_ie(wb, WPA_IE_VENDOR_TYPE) != NULL ||
1402 wpa_scan_get_ie(wb, WLAN_EID_RSN) != NULL;
1403
1404 if (wpa_b && !wpa_a)
1405 return 1;
1406 if (!wpa_b && wpa_a)
1407 return -1;
1408
1409 /* privacy support preferred */
1410 if ((wa->caps & IEEE80211_CAP_PRIVACY) == 0 &&
1411 (wb->caps & IEEE80211_CAP_PRIVACY))
1412 return 1;
1413 if ((wa->caps & IEEE80211_CAP_PRIVACY) &&
1414 (wb->caps & IEEE80211_CAP_PRIVACY) == 0)
1415 return -1;
1416
1417 if ((wa->flags & wb->flags & WPA_SCAN_LEVEL_DBM) &&
1418 !((wa->flags | wb->flags) & WPA_SCAN_NOISE_INVALID)) {
1419 snr_a = MIN(wa->level - wa->noise, GREAT_SNR);
1420 snr_b = MIN(wb->level - wb->noise, GREAT_SNR);
1421 } else {
1422 /* Not suitable information to calculate SNR, so use level */
1423 snr_a = wa->level;
1424 snr_b = wb->level;
1425 }
1426
1427 /* best/max rate preferred if SNR close enough */
1428 if ((snr_a && snr_b && abs(snr_b - snr_a) < 5) ||
1429 (wa->qual && wb->qual && abs(wb->qual - wa->qual) < 10)) {
1430 maxrate_a = wpa_scan_get_max_rate(wa);
1431 maxrate_b = wpa_scan_get_max_rate(wb);
1432 if (maxrate_a != maxrate_b)
1433 return maxrate_b - maxrate_a;
1434 if (IS_5GHZ(wa->freq) ^ IS_5GHZ(wb->freq))
1435 return IS_5GHZ(wa->freq) ? -1 : 1;
1436 }
1437
1438 /* use freq for channel preference */
1439
1440 /* all things being equal, use SNR; if SNRs are
1441 * identical, use quality values since some drivers may only report
1442 * that value and leave the signal level zero */
1443 if (snr_b == snr_a)
1444 return wb->qual - wa->qual;
1445 return snr_b - snr_a;
1446 #undef MIN
1447 #undef IS_5GHZ
1448 }
1449
1450
1451 #ifdef CONFIG_WPS
1452 /* Compare function for sorting scan results when searching a WPS AP for
1453 * provisioning. Return >0 if @b is considered better. */
1454 static int wpa_scan_result_wps_compar(const void *a, const void *b)
1455 {
1456 struct wpa_scan_res **_wa = (void *) a;
1457 struct wpa_scan_res **_wb = (void *) b;
1458 struct wpa_scan_res *wa = *_wa;
1459 struct wpa_scan_res *wb = *_wb;
1460 int uses_wps_a, uses_wps_b;
1461 struct wpabuf *wps_a, *wps_b;
1462 int res;
1463
1464 /* Optimization - check WPS IE existence before allocated memory and
1465 * doing full reassembly. */
1466 uses_wps_a = wpa_scan_get_vendor_ie(wa, WPS_IE_VENDOR_TYPE) != NULL;
1467 uses_wps_b = wpa_scan_get_vendor_ie(wb, WPS_IE_VENDOR_TYPE) != NULL;
1468 if (uses_wps_a && !uses_wps_b)
1469 return -1;
1470 if (!uses_wps_a && uses_wps_b)
1471 return 1;
1472
1473 if (uses_wps_a && uses_wps_b) {
1474 wps_a = wpa_scan_get_vendor_ie_multi(wa, WPS_IE_VENDOR_TYPE);
1475 wps_b = wpa_scan_get_vendor_ie_multi(wb, WPS_IE_VENDOR_TYPE);
1476 res = wps_ap_priority_compar(wps_a, wps_b);
1477 wpabuf_free(wps_a);
1478 wpabuf_free(wps_b);
1479 if (res)
1480 return res;
1481 }
1482
1483 /*
1484 * Do not use current AP security policy as a sorting criteria during
1485 * WPS provisioning step since the AP may get reconfigured at the
1486 * completion of provisioning.
1487 */
1488
1489 /* all things being equal, use signal level; if signal levels are
1490 * identical, use quality values since some drivers may only report
1491 * that value and leave the signal level zero */
1492 if (wb->level == wa->level)
1493 return wb->qual - wa->qual;
1494 return wb->level - wa->level;
1495 }
1496 #endif /* CONFIG_WPS */
1497
1498
1499 static void dump_scan_res(struct wpa_scan_results *scan_res)
1500 {
1501 #ifndef CONFIG_NO_STDOUT_DEBUG
1502 size_t i;
1503
1504 if (scan_res->res == NULL || scan_res->num == 0)
1505 return;
1506
1507 wpa_printf(MSG_EXCESSIVE, "Sorted scan results");
1508
1509 for (i = 0; i < scan_res->num; i++) {
1510 struct wpa_scan_res *r = scan_res->res[i];
1511 u8 *pos;
1512 if ((r->flags & (WPA_SCAN_LEVEL_DBM | WPA_SCAN_NOISE_INVALID))
1513 == WPA_SCAN_LEVEL_DBM) {
1514 int snr = r->level - r->noise;
1515 wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d "
1516 "noise=%d level=%d snr=%d%s flags=0x%x "
1517 "age=%u",
1518 MAC2STR(r->bssid), r->freq, r->qual,
1519 r->noise, r->level, snr,
1520 snr >= GREAT_SNR ? "*" : "", r->flags,
1521 r->age);
1522 } else {
1523 wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d "
1524 "noise=%d level=%d flags=0x%x age=%u",
1525 MAC2STR(r->bssid), r->freq, r->qual,
1526 r->noise, r->level, r->flags, r->age);
1527 }
1528 pos = (u8 *) (r + 1);
1529 if (r->ie_len)
1530 wpa_hexdump(MSG_EXCESSIVE, "IEs", pos, r->ie_len);
1531 pos += r->ie_len;
1532 if (r->beacon_ie_len)
1533 wpa_hexdump(MSG_EXCESSIVE, "Beacon IEs",
1534 pos, r->beacon_ie_len);
1535 }
1536 #endif /* CONFIG_NO_STDOUT_DEBUG */
1537 }
1538
1539
1540 /**
1541 * wpa_supplicant_filter_bssid_match - Is the specified BSSID allowed
1542 * @wpa_s: Pointer to wpa_supplicant data
1543 * @bssid: BSSID to check
1544 * Returns: 0 if the BSSID is filtered or 1 if not
1545 *
1546 * This function is used to filter out specific BSSIDs from scan reslts mainly
1547 * for testing purposes (SET bssid_filter ctrl_iface command).
1548 */
1549 int wpa_supplicant_filter_bssid_match(struct wpa_supplicant *wpa_s,
1550 const u8 *bssid)
1551 {
1552 size_t i;
1553
1554 if (wpa_s->bssid_filter == NULL)
1555 return 1;
1556
1557 for (i = 0; i < wpa_s->bssid_filter_count; i++) {
1558 if (os_memcmp(wpa_s->bssid_filter + i * ETH_ALEN, bssid,
1559 ETH_ALEN) == 0)
1560 return 1;
1561 }
1562
1563 return 0;
1564 }
1565
1566
1567 static void filter_scan_res(struct wpa_supplicant *wpa_s,
1568 struct wpa_scan_results *res)
1569 {
1570 size_t i, j;
1571
1572 if (wpa_s->bssid_filter == NULL)
1573 return;
1574
1575 for (i = 0, j = 0; i < res->num; i++) {
1576 if (wpa_supplicant_filter_bssid_match(wpa_s,
1577 res->res[i]->bssid)) {
1578 res->res[j++] = res->res[i];
1579 } else {
1580 os_free(res->res[i]);
1581 res->res[i] = NULL;
1582 }
1583 }
1584
1585 if (res->num != j) {
1586 wpa_printf(MSG_DEBUG, "Filtered out %d scan results",
1587 (int) (res->num - j));
1588 res->num = j;
1589 }
1590 }
1591
1592
1593 /**
1594 * wpa_supplicant_get_scan_results - Get scan results
1595 * @wpa_s: Pointer to wpa_supplicant data
1596 * @info: Information about what was scanned or %NULL if not available
1597 * @new_scan: Whether a new scan was performed
1598 * Returns: Scan results, %NULL on failure
1599 *
1600 * This function request the current scan results from the driver and updates
1601 * the local BSS list wpa_s->bss. The caller is responsible for freeing the
1602 * results with wpa_scan_results_free().
1603 */
1604 struct wpa_scan_results *
1605 wpa_supplicant_get_scan_results(struct wpa_supplicant *wpa_s,
1606 struct scan_info *info, int new_scan)
1607 {
1608 struct wpa_scan_results *scan_res;
1609 size_t i;
1610 int (*compar)(const void *, const void *) = wpa_scan_result_compar;
1611
1612 scan_res = wpa_drv_get_scan_results2(wpa_s);
1613 if (scan_res == NULL) {
1614 wpa_dbg(wpa_s, MSG_DEBUG, "Failed to get scan results");
1615 return NULL;
1616 }
1617 if (scan_res->fetch_time.sec == 0) {
1618 /*
1619 * Make sure we have a valid timestamp if the driver wrapper
1620 * does not set this.
1621 */
1622 os_get_time(&scan_res->fetch_time);
1623 }
1624 filter_scan_res(wpa_s, scan_res);
1625
1626 #ifdef CONFIG_WPS
1627 if (wpas_wps_in_progress(wpa_s)) {
1628 wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Order scan results with WPS "
1629 "provisioning rules");
1630 compar = wpa_scan_result_wps_compar;
1631 }
1632 #endif /* CONFIG_WPS */
1633
1634 qsort(scan_res->res, scan_res->num, sizeof(struct wpa_scan_res *),
1635 compar);
1636 dump_scan_res(scan_res);
1637
1638 wpa_bss_update_start(wpa_s);
1639 for (i = 0; i < scan_res->num; i++)
1640 wpa_bss_update_scan_res(wpa_s, scan_res->res[i],
1641 &scan_res->fetch_time);
1642 wpa_bss_update_end(wpa_s, info, new_scan);
1643
1644 return scan_res;
1645 }
1646
1647
1648 /**
1649 * wpa_supplicant_update_scan_results - Update scan results from the driver
1650 * @wpa_s: Pointer to wpa_supplicant data
1651 * Returns: 0 on success, -1 on failure
1652 *
1653 * This function updates the BSS table within wpa_supplicant based on the
1654 * currently available scan results from the driver without requesting a new
1655 * scan. This is used in cases where the driver indicates an association
1656 * (including roaming within ESS) and wpa_supplicant does not yet have the
1657 * needed information to complete the connection (e.g., to perform validation
1658 * steps in 4-way handshake).
1659 */
1660 int wpa_supplicant_update_scan_results(struct wpa_supplicant *wpa_s)
1661 {
1662 struct wpa_scan_results *scan_res;
1663 scan_res = wpa_supplicant_get_scan_results(wpa_s, NULL, 0);
1664 if (scan_res == NULL)
1665 return -1;
1666 wpa_scan_results_free(scan_res);
1667
1668 return 0;
1669 }
1670
1671
1672 /**
1673 * scan_only_handler - Reports scan results
1674 */
1675 void scan_only_handler(struct wpa_supplicant *wpa_s,
1676 struct wpa_scan_results *scan_res)
1677 {
1678 wpa_dbg(wpa_s, MSG_DEBUG, "Scan-only results received");
1679 wpa_msg_ctrl(wpa_s, MSG_INFO, WPA_EVENT_SCAN_RESULTS);
1680 wpas_notify_scan_results(wpa_s);
1681 wpas_notify_scan_done(wpa_s, 1);
1682 }
1683
1684
1685 int wpas_scan_scheduled(struct wpa_supplicant *wpa_s)
1686 {
1687 return eloop_is_timeout_registered(wpa_supplicant_scan, wpa_s, NULL);
1688 }
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