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