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nl80211: Add an option to specify the BSSID to scan for
[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 #include "mesh.h"
26
27
28 static void wpa_supplicant_gen_assoc_event(struct wpa_supplicant *wpa_s)
29 {
30 struct wpa_ssid *ssid;
31 union wpa_event_data data;
32
33 ssid = wpa_supplicant_get_ssid(wpa_s);
34 if (ssid == NULL)
35 return;
36
37 if (wpa_s->current_ssid == NULL) {
38 wpa_s->current_ssid = ssid;
39 if (wpa_s->current_ssid != NULL)
40 wpas_notify_network_changed(wpa_s);
41 }
42 wpa_supplicant_initiate_eapol(wpa_s);
43 wpa_dbg(wpa_s, MSG_DEBUG, "Already associated with a configured "
44 "network - generating associated event");
45 os_memset(&data, 0, sizeof(data));
46 wpa_supplicant_event(wpa_s, EVENT_ASSOC, &data);
47 }
48
49
50 #ifdef CONFIG_WPS
51 static int wpas_wps_in_use(struct wpa_supplicant *wpa_s,
52 enum wps_request_type *req_type)
53 {
54 struct wpa_ssid *ssid;
55 int wps = 0;
56
57 for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
58 if (!(ssid->key_mgmt & WPA_KEY_MGMT_WPS))
59 continue;
60
61 wps = 1;
62 *req_type = wpas_wps_get_req_type(ssid);
63 if (!ssid->eap.phase1)
64 continue;
65
66 if (os_strstr(ssid->eap.phase1, "pbc=1"))
67 return 2;
68 }
69
70 #ifdef CONFIG_P2P
71 if (!wpa_s->global->p2p_disabled && wpa_s->global->p2p &&
72 !wpa_s->conf->p2p_disabled) {
73 wpa_s->wps->dev.p2p = 1;
74 if (!wps) {
75 wps = 1;
76 *req_type = WPS_REQ_ENROLLEE_INFO;
77 }
78 }
79 #endif /* CONFIG_P2P */
80
81 return wps;
82 }
83 #endif /* CONFIG_WPS */
84
85
86 /**
87 * wpa_supplicant_enabled_networks - Check whether there are enabled networks
88 * @wpa_s: Pointer to wpa_supplicant data
89 * Returns: 0 if no networks are enabled, >0 if networks are enabled
90 *
91 * This function is used to figure out whether any networks (or Interworking
92 * with enabled credentials and auto_interworking) are present in the current
93 * configuration.
94 */
95 int wpa_supplicant_enabled_networks(struct wpa_supplicant *wpa_s)
96 {
97 struct wpa_ssid *ssid = wpa_s->conf->ssid;
98 int count = 0, disabled = 0;
99
100 if (wpa_s->p2p_mgmt)
101 return 0; /* no normal network profiles on p2p_mgmt interface */
102
103 while (ssid) {
104 if (!wpas_network_disabled(wpa_s, ssid))
105 count++;
106 else
107 disabled++;
108 ssid = ssid->next;
109 }
110 if (wpa_s->conf->cred && wpa_s->conf->interworking &&
111 wpa_s->conf->auto_interworking)
112 count++;
113 if (count == 0 && disabled > 0) {
114 wpa_dbg(wpa_s, MSG_DEBUG, "No enabled networks (%d disabled "
115 "networks)", disabled);
116 }
117 return count;
118 }
119
120
121 static void wpa_supplicant_assoc_try(struct wpa_supplicant *wpa_s,
122 struct wpa_ssid *ssid)
123 {
124 while (ssid) {
125 if (!wpas_network_disabled(wpa_s, ssid))
126 break;
127 ssid = ssid->next;
128 }
129
130 /* ap_scan=2 mode - try to associate with each SSID. */
131 if (ssid == NULL) {
132 wpa_dbg(wpa_s, MSG_DEBUG, "wpa_supplicant_assoc_try: Reached "
133 "end of scan list - go back to beginning");
134 wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
135 wpa_supplicant_req_scan(wpa_s, 0, 0);
136 return;
137 }
138 if (ssid->next) {
139 /* Continue from the next SSID on the next attempt. */
140 wpa_s->prev_scan_ssid = ssid;
141 } else {
142 /* Start from the beginning of the SSID list. */
143 wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
144 }
145 wpa_supplicant_associate(wpa_s, NULL, ssid);
146 }
147
148
149 static void wpas_trigger_scan_cb(struct wpa_radio_work *work, int deinit)
150 {
151 struct wpa_supplicant *wpa_s = work->wpa_s;
152 struct wpa_driver_scan_params *params = work->ctx;
153 int ret;
154
155 if (deinit) {
156 if (!work->started) {
157 wpa_scan_free_params(params);
158 return;
159 }
160 wpa_supplicant_notify_scanning(wpa_s, 0);
161 wpas_notify_scan_done(wpa_s, 0);
162 wpa_s->scan_work = NULL;
163 return;
164 }
165
166 if (wpas_update_random_addr_disassoc(wpa_s) < 0) {
167 wpa_msg(wpa_s, MSG_INFO,
168 "Failed to assign random MAC address for a scan");
169 radio_work_done(work);
170 return;
171 }
172
173 wpa_supplicant_notify_scanning(wpa_s, 1);
174
175 if (wpa_s->clear_driver_scan_cache) {
176 wpa_printf(MSG_DEBUG,
177 "Request driver to clear scan cache due to local BSS flush");
178 params->only_new_results = 1;
179 }
180 ret = wpa_drv_scan(wpa_s, params);
181 wpa_scan_free_params(params);
182 work->ctx = NULL;
183 if (ret) {
184 int retry = wpa_s->last_scan_req != MANUAL_SCAN_REQ;
185
186 if (wpa_s->disconnected)
187 retry = 0;
188
189 wpa_supplicant_notify_scanning(wpa_s, 0);
190 wpas_notify_scan_done(wpa_s, 0);
191 if (wpa_s->wpa_state == WPA_SCANNING)
192 wpa_supplicant_set_state(wpa_s,
193 wpa_s->scan_prev_wpa_state);
194 wpa_msg(wpa_s, MSG_INFO, WPA_EVENT_SCAN_FAILED "ret=%d%s",
195 ret, retry ? " retry=1" : "");
196 radio_work_done(work);
197
198 if (retry) {
199 /* Restore scan_req since we will try to scan again */
200 wpa_s->scan_req = wpa_s->last_scan_req;
201 wpa_supplicant_req_scan(wpa_s, 1, 0);
202 }
203 return;
204 }
205
206 os_get_reltime(&wpa_s->scan_trigger_time);
207 wpa_s->scan_runs++;
208 wpa_s->normal_scans++;
209 wpa_s->own_scan_requested = 1;
210 wpa_s->clear_driver_scan_cache = 0;
211 wpa_s->scan_work = work;
212 }
213
214
215 /**
216 * wpa_supplicant_trigger_scan - Request driver to start a scan
217 * @wpa_s: Pointer to wpa_supplicant data
218 * @params: Scan parameters
219 * Returns: 0 on success, -1 on failure
220 */
221 int wpa_supplicant_trigger_scan(struct wpa_supplicant *wpa_s,
222 struct wpa_driver_scan_params *params)
223 {
224 struct wpa_driver_scan_params *ctx;
225
226 if (wpa_s->scan_work) {
227 wpa_dbg(wpa_s, MSG_INFO, "Reject scan trigger since one is already pending");
228 return -1;
229 }
230
231 ctx = wpa_scan_clone_params(params);
232 if (ctx == NULL)
233 return -1;
234
235 if (radio_add_work(wpa_s, 0, "scan", 0, wpas_trigger_scan_cb, ctx) < 0)
236 {
237 wpa_scan_free_params(ctx);
238 return -1;
239 }
240
241 return 0;
242 }
243
244
245 static void
246 wpa_supplicant_delayed_sched_scan_timeout(void *eloop_ctx, void *timeout_ctx)
247 {
248 struct wpa_supplicant *wpa_s = eloop_ctx;
249
250 wpa_dbg(wpa_s, MSG_DEBUG, "Starting delayed sched scan");
251
252 if (wpa_supplicant_req_sched_scan(wpa_s))
253 wpa_supplicant_req_scan(wpa_s, 0, 0);
254 }
255
256
257 static void
258 wpa_supplicant_sched_scan_timeout(void *eloop_ctx, void *timeout_ctx)
259 {
260 struct wpa_supplicant *wpa_s = eloop_ctx;
261
262 wpa_dbg(wpa_s, MSG_DEBUG, "Sched scan timeout - stopping it");
263
264 wpa_s->sched_scan_timed_out = 1;
265 wpa_supplicant_cancel_sched_scan(wpa_s);
266 }
267
268
269 int wpa_supplicant_start_sched_scan(struct wpa_supplicant *wpa_s,
270 struct wpa_driver_scan_params *params)
271 {
272 int ret;
273
274 wpa_supplicant_notify_scanning(wpa_s, 1);
275 ret = wpa_drv_sched_scan(wpa_s, params);
276 if (ret)
277 wpa_supplicant_notify_scanning(wpa_s, 0);
278 else
279 wpa_s->sched_scanning = 1;
280
281 return ret;
282 }
283
284
285 int wpa_supplicant_stop_sched_scan(struct wpa_supplicant *wpa_s)
286 {
287 int ret;
288
289 ret = wpa_drv_stop_sched_scan(wpa_s);
290 if (ret) {
291 wpa_dbg(wpa_s, MSG_DEBUG, "stopping sched_scan failed!");
292 /* TODO: what to do if stopping fails? */
293 return -1;
294 }
295
296 return ret;
297 }
298
299
300 static struct wpa_driver_scan_filter *
301 wpa_supplicant_build_filter_ssids(struct wpa_config *conf, size_t *num_ssids)
302 {
303 struct wpa_driver_scan_filter *ssids;
304 struct wpa_ssid *ssid;
305 size_t count;
306
307 *num_ssids = 0;
308 if (!conf->filter_ssids)
309 return NULL;
310
311 for (count = 0, ssid = conf->ssid; ssid; ssid = ssid->next) {
312 if (ssid->ssid && ssid->ssid_len)
313 count++;
314 }
315 if (count == 0)
316 return NULL;
317 ssids = os_calloc(count, sizeof(struct wpa_driver_scan_filter));
318 if (ssids == NULL)
319 return NULL;
320
321 for (ssid = conf->ssid; ssid; ssid = ssid->next) {
322 if (!ssid->ssid || !ssid->ssid_len)
323 continue;
324 os_memcpy(ssids[*num_ssids].ssid, ssid->ssid, ssid->ssid_len);
325 ssids[*num_ssids].ssid_len = ssid->ssid_len;
326 (*num_ssids)++;
327 }
328
329 return ssids;
330 }
331
332
333 static void wpa_supplicant_optimize_freqs(
334 struct wpa_supplicant *wpa_s, struct wpa_driver_scan_params *params)
335 {
336 #ifdef CONFIG_P2P
337 if (params->freqs == NULL && wpa_s->p2p_in_provisioning &&
338 wpa_s->go_params) {
339 /* Optimize provisioning state scan based on GO information */
340 if (wpa_s->p2p_in_provisioning < 5 &&
341 wpa_s->go_params->freq > 0) {
342 wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only GO "
343 "preferred frequency %d MHz",
344 wpa_s->go_params->freq);
345 params->freqs = os_calloc(2, sizeof(int));
346 if (params->freqs)
347 params->freqs[0] = wpa_s->go_params->freq;
348 } else if (wpa_s->p2p_in_provisioning < 8 &&
349 wpa_s->go_params->freq_list[0]) {
350 wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only common "
351 "channels");
352 int_array_concat(&params->freqs,
353 wpa_s->go_params->freq_list);
354 if (params->freqs)
355 int_array_sort_unique(params->freqs);
356 }
357 wpa_s->p2p_in_provisioning++;
358 }
359
360 if (params->freqs == NULL && wpa_s->p2p_in_invitation) {
361 /*
362 * Optimize scan based on GO information during persistent
363 * group reinvocation
364 */
365 if (wpa_s->p2p_in_invitation < 5 &&
366 wpa_s->p2p_invite_go_freq > 0) {
367 wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only GO preferred frequency %d MHz during invitation",
368 wpa_s->p2p_invite_go_freq);
369 params->freqs = os_calloc(2, sizeof(int));
370 if (params->freqs)
371 params->freqs[0] = wpa_s->p2p_invite_go_freq;
372 }
373 wpa_s->p2p_in_invitation++;
374 if (wpa_s->p2p_in_invitation > 20) {
375 /*
376 * This should not really happen since the variable is
377 * cleared on group removal, but if it does happen, make
378 * sure we do not get stuck in special invitation scan
379 * mode.
380 */
381 wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Clear p2p_in_invitation");
382 wpa_s->p2p_in_invitation = 0;
383 }
384 }
385 #endif /* CONFIG_P2P */
386
387 #ifdef CONFIG_WPS
388 if (params->freqs == NULL && wpa_s->after_wps && wpa_s->wps_freq) {
389 /*
390 * Optimize post-provisioning scan based on channel used
391 * during provisioning.
392 */
393 wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Scan only frequency %u MHz "
394 "that was used during provisioning", wpa_s->wps_freq);
395 params->freqs = os_calloc(2, sizeof(int));
396 if (params->freqs)
397 params->freqs[0] = wpa_s->wps_freq;
398 wpa_s->after_wps--;
399 } else if (wpa_s->after_wps)
400 wpa_s->after_wps--;
401
402 if (params->freqs == NULL && wpa_s->known_wps_freq && wpa_s->wps_freq)
403 {
404 /* Optimize provisioning scan based on already known channel */
405 wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Scan only frequency %u MHz",
406 wpa_s->wps_freq);
407 params->freqs = os_calloc(2, sizeof(int));
408 if (params->freqs)
409 params->freqs[0] = wpa_s->wps_freq;
410 wpa_s->known_wps_freq = 0; /* only do this once */
411 }
412 #endif /* CONFIG_WPS */
413 }
414
415
416 #ifdef CONFIG_INTERWORKING
417 static void wpas_add_interworking_elements(struct wpa_supplicant *wpa_s,
418 struct wpabuf *buf)
419 {
420 wpabuf_put_u8(buf, WLAN_EID_INTERWORKING);
421 wpabuf_put_u8(buf, is_zero_ether_addr(wpa_s->conf->hessid) ? 1 :
422 1 + ETH_ALEN);
423 wpabuf_put_u8(buf, wpa_s->conf->access_network_type);
424 /* No Venue Info */
425 if (!is_zero_ether_addr(wpa_s->conf->hessid))
426 wpabuf_put_data(buf, wpa_s->conf->hessid, ETH_ALEN);
427 }
428 #endif /* CONFIG_INTERWORKING */
429
430
431 static struct wpabuf * wpa_supplicant_extra_ies(struct wpa_supplicant *wpa_s)
432 {
433 struct wpabuf *extra_ie = NULL;
434 u8 ext_capab[18];
435 int ext_capab_len;
436 #ifdef CONFIG_WPS
437 int wps = 0;
438 enum wps_request_type req_type = WPS_REQ_ENROLLEE_INFO;
439 #endif /* CONFIG_WPS */
440
441 ext_capab_len = wpas_build_ext_capab(wpa_s, ext_capab,
442 sizeof(ext_capab));
443 if (ext_capab_len > 0 &&
444 wpabuf_resize(&extra_ie, ext_capab_len) == 0)
445 wpabuf_put_data(extra_ie, ext_capab, ext_capab_len);
446
447 #ifdef CONFIG_INTERWORKING
448 if (wpa_s->conf->interworking &&
449 wpabuf_resize(&extra_ie, 100) == 0)
450 wpas_add_interworking_elements(wpa_s, extra_ie);
451 #endif /* CONFIG_INTERWORKING */
452
453 #ifdef CONFIG_WPS
454 wps = wpas_wps_in_use(wpa_s, &req_type);
455
456 if (wps) {
457 struct wpabuf *wps_ie;
458 wps_ie = wps_build_probe_req_ie(wps == 2 ? DEV_PW_PUSHBUTTON :
459 DEV_PW_DEFAULT,
460 &wpa_s->wps->dev,
461 wpa_s->wps->uuid, req_type,
462 0, NULL);
463 if (wps_ie) {
464 if (wpabuf_resize(&extra_ie, wpabuf_len(wps_ie)) == 0)
465 wpabuf_put_buf(extra_ie, wps_ie);
466 wpabuf_free(wps_ie);
467 }
468 }
469
470 #ifdef CONFIG_P2P
471 if (wps) {
472 size_t ielen = p2p_scan_ie_buf_len(wpa_s->global->p2p);
473 if (wpabuf_resize(&extra_ie, ielen) == 0)
474 wpas_p2p_scan_ie(wpa_s, extra_ie);
475 }
476 #endif /* CONFIG_P2P */
477
478 wpa_supplicant_mesh_add_scan_ie(wpa_s, &extra_ie);
479
480 #endif /* CONFIG_WPS */
481
482 #ifdef CONFIG_HS20
483 if (wpa_s->conf->hs20 && wpabuf_resize(&extra_ie, 7) == 0)
484 wpas_hs20_add_indication(extra_ie, -1);
485 #endif /* CONFIG_HS20 */
486
487 #ifdef CONFIG_FST
488 if (wpa_s->fst_ies &&
489 wpabuf_resize(&extra_ie, wpabuf_len(wpa_s->fst_ies)) == 0)
490 wpabuf_put_buf(extra_ie, wpa_s->fst_ies);
491 #endif /* CONFIG_FST */
492
493 #ifdef CONFIG_MBO
494 /* Send cellular capabilities for potential MBO STAs */
495 if (wpabuf_resize(&extra_ie, 9) == 0)
496 wpas_mbo_scan_ie(wpa_s, extra_ie);
497 #endif /* CONFIG_MBO */
498
499 return extra_ie;
500 }
501
502
503 #ifdef CONFIG_P2P
504
505 /*
506 * Check whether there are any enabled networks or credentials that could be
507 * used for a non-P2P connection.
508 */
509 static int non_p2p_network_enabled(struct wpa_supplicant *wpa_s)
510 {
511 struct wpa_ssid *ssid;
512
513 for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
514 if (wpas_network_disabled(wpa_s, ssid))
515 continue;
516 if (!ssid->p2p_group)
517 return 1;
518 }
519
520 if (wpa_s->conf->cred && wpa_s->conf->interworking &&
521 wpa_s->conf->auto_interworking)
522 return 1;
523
524 return 0;
525 }
526
527 #endif /* CONFIG_P2P */
528
529
530 static void wpa_setband_scan_freqs_list(struct wpa_supplicant *wpa_s,
531 enum hostapd_hw_mode band,
532 struct wpa_driver_scan_params *params)
533 {
534 /* Include only supported channels for the specified band */
535 struct hostapd_hw_modes *mode;
536 int count, i;
537
538 mode = get_mode(wpa_s->hw.modes, wpa_s->hw.num_modes, band);
539 if (mode == NULL) {
540 /* No channels supported in this band - use empty list */
541 params->freqs = os_zalloc(sizeof(int));
542 return;
543 }
544
545 params->freqs = os_calloc(mode->num_channels + 1, sizeof(int));
546 if (params->freqs == NULL)
547 return;
548 for (count = 0, i = 0; i < mode->num_channels; i++) {
549 if (mode->channels[i].flag & HOSTAPD_CHAN_DISABLED)
550 continue;
551 params->freqs[count++] = mode->channels[i].freq;
552 }
553 }
554
555
556 static void wpa_setband_scan_freqs(struct wpa_supplicant *wpa_s,
557 struct wpa_driver_scan_params *params)
558 {
559 if (wpa_s->hw.modes == NULL)
560 return; /* unknown what channels the driver supports */
561 if (params->freqs)
562 return; /* already using a limited channel set */
563 if (wpa_s->setband == WPA_SETBAND_5G)
564 wpa_setband_scan_freqs_list(wpa_s, HOSTAPD_MODE_IEEE80211A,
565 params);
566 else if (wpa_s->setband == WPA_SETBAND_2G)
567 wpa_setband_scan_freqs_list(wpa_s, HOSTAPD_MODE_IEEE80211G,
568 params);
569 }
570
571
572 static void wpa_set_scan_ssids(struct wpa_supplicant *wpa_s,
573 struct wpa_driver_scan_params *params,
574 size_t max_ssids)
575 {
576 unsigned int i;
577 struct wpa_ssid *ssid;
578
579 for (i = 0; i < wpa_s->scan_id_count; i++) {
580 unsigned int j;
581
582 ssid = wpa_config_get_network(wpa_s->conf, wpa_s->scan_id[i]);
583 if (!ssid || !ssid->scan_ssid)
584 continue;
585
586 for (j = 0; j < params->num_ssids; j++) {
587 if (params->ssids[j].ssid_len == ssid->ssid_len &&
588 params->ssids[j].ssid &&
589 os_memcmp(params->ssids[j].ssid, ssid->ssid,
590 ssid->ssid_len) == 0)
591 break;
592 }
593 if (j < params->num_ssids)
594 continue; /* already in the list */
595
596 if (params->num_ssids + 1 > max_ssids) {
597 wpa_printf(MSG_DEBUG,
598 "Over max scan SSIDs for manual request");
599 break;
600 }
601
602 wpa_printf(MSG_DEBUG, "Scan SSID (manual request): %s",
603 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
604 params->ssids[params->num_ssids].ssid = ssid->ssid;
605 params->ssids[params->num_ssids].ssid_len = ssid->ssid_len;
606 params->num_ssids++;
607 }
608
609 wpa_s->scan_id_count = 0;
610 }
611
612
613 static int wpa_set_ssids_from_scan_req(struct wpa_supplicant *wpa_s,
614 struct wpa_driver_scan_params *params,
615 size_t max_ssids)
616 {
617 unsigned int i;
618
619 if (wpa_s->ssids_from_scan_req == NULL ||
620 wpa_s->num_ssids_from_scan_req == 0)
621 return 0;
622
623 if (wpa_s->num_ssids_from_scan_req > max_ssids) {
624 wpa_s->num_ssids_from_scan_req = max_ssids;
625 wpa_printf(MSG_DEBUG, "Over max scan SSIDs from scan req: %u",
626 (unsigned int) max_ssids);
627 }
628
629 for (i = 0; i < wpa_s->num_ssids_from_scan_req; i++) {
630 params->ssids[i].ssid = wpa_s->ssids_from_scan_req[i].ssid;
631 params->ssids[i].ssid_len =
632 wpa_s->ssids_from_scan_req[i].ssid_len;
633 wpa_hexdump_ascii(MSG_DEBUG, "specific SSID",
634 params->ssids[i].ssid,
635 params->ssids[i].ssid_len);
636 }
637
638 params->num_ssids = wpa_s->num_ssids_from_scan_req;
639 wpa_s->num_ssids_from_scan_req = 0;
640 return 1;
641 }
642
643
644 static void wpa_supplicant_scan(void *eloop_ctx, void *timeout_ctx)
645 {
646 struct wpa_supplicant *wpa_s = eloop_ctx;
647 struct wpa_ssid *ssid;
648 int ret, p2p_in_prog;
649 struct wpabuf *extra_ie = NULL;
650 struct wpa_driver_scan_params params;
651 struct wpa_driver_scan_params *scan_params;
652 size_t max_ssids;
653 int connect_without_scan = 0;
654
655 if (wpa_s->pno || wpa_s->pno_sched_pending) {
656 wpa_dbg(wpa_s, MSG_DEBUG, "Skip scan - PNO is in progress");
657 return;
658 }
659
660 if (wpa_s->wpa_state == WPA_INTERFACE_DISABLED) {
661 wpa_dbg(wpa_s, MSG_DEBUG, "Skip scan - interface disabled");
662 return;
663 }
664
665 if (wpa_s->disconnected && wpa_s->scan_req == NORMAL_SCAN_REQ) {
666 wpa_dbg(wpa_s, MSG_DEBUG, "Disconnected - do not scan");
667 wpa_supplicant_set_state(wpa_s, WPA_DISCONNECTED);
668 return;
669 }
670
671 if (wpa_s->scanning) {
672 /*
673 * If we are already in scanning state, we shall reschedule the
674 * the incoming scan request.
675 */
676 wpa_dbg(wpa_s, MSG_DEBUG, "Already scanning - Reschedule the incoming scan req");
677 wpa_supplicant_req_scan(wpa_s, 1, 0);
678 return;
679 }
680
681 if (!wpa_supplicant_enabled_networks(wpa_s) &&
682 wpa_s->scan_req == NORMAL_SCAN_REQ) {
683 wpa_dbg(wpa_s, MSG_DEBUG, "No enabled networks - do not scan");
684 wpa_supplicant_set_state(wpa_s, WPA_INACTIVE);
685 return;
686 }
687
688 if (wpa_s->conf->ap_scan != 0 &&
689 (wpa_s->drv_flags & WPA_DRIVER_FLAGS_WIRED)) {
690 wpa_dbg(wpa_s, MSG_DEBUG, "Using wired authentication - "
691 "overriding ap_scan configuration");
692 wpa_s->conf->ap_scan = 0;
693 wpas_notify_ap_scan_changed(wpa_s);
694 }
695
696 if (wpa_s->conf->ap_scan == 0) {
697 wpa_supplicant_gen_assoc_event(wpa_s);
698 return;
699 }
700
701 ssid = NULL;
702 if (wpa_s->scan_req != MANUAL_SCAN_REQ &&
703 wpa_s->connect_without_scan) {
704 connect_without_scan = 1;
705 for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
706 if (ssid == wpa_s->connect_without_scan)
707 break;
708 }
709 }
710
711 p2p_in_prog = wpas_p2p_in_progress(wpa_s);
712 if (p2p_in_prog && p2p_in_prog != 2 &&
713 (!ssid ||
714 (ssid->mode != WPAS_MODE_AP && ssid->mode != WPAS_MODE_P2P_GO))) {
715 wpa_dbg(wpa_s, MSG_DEBUG, "Delay station mode scan while P2P operation is in progress");
716 wpa_supplicant_req_scan(wpa_s, 5, 0);
717 return;
718 }
719
720 if (wpa_s->conf->ap_scan == 2)
721 max_ssids = 1;
722 else {
723 max_ssids = wpa_s->max_scan_ssids;
724 if (max_ssids > WPAS_MAX_SCAN_SSIDS)
725 max_ssids = WPAS_MAX_SCAN_SSIDS;
726 }
727
728 wpa_s->last_scan_req = wpa_s->scan_req;
729 wpa_s->scan_req = NORMAL_SCAN_REQ;
730
731 if (connect_without_scan) {
732 wpa_s->connect_without_scan = NULL;
733 if (ssid) {
734 wpa_printf(MSG_DEBUG, "Start a pre-selected network "
735 "without scan step");
736 wpa_supplicant_associate(wpa_s, NULL, ssid);
737 return;
738 }
739 }
740
741 os_memset(&params, 0, sizeof(params));
742
743 wpa_s->scan_prev_wpa_state = wpa_s->wpa_state;
744 if (wpa_s->wpa_state == WPA_DISCONNECTED ||
745 wpa_s->wpa_state == WPA_INACTIVE)
746 wpa_supplicant_set_state(wpa_s, WPA_SCANNING);
747
748 /*
749 * If autoscan has set its own scanning parameters
750 */
751 if (wpa_s->autoscan_params != NULL) {
752 scan_params = wpa_s->autoscan_params;
753 goto scan;
754 }
755
756 if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
757 wpa_set_ssids_from_scan_req(wpa_s, &params, max_ssids)) {
758 wpa_printf(MSG_DEBUG, "Use specific SSIDs from SCAN command");
759 goto ssid_list_set;
760 }
761
762 #ifdef CONFIG_P2P
763 if ((wpa_s->p2p_in_provisioning || wpa_s->show_group_started) &&
764 wpa_s->go_params && !wpa_s->conf->passive_scan) {
765 wpa_printf(MSG_DEBUG, "P2P: Use specific SSID for scan during P2P group formation (p2p_in_provisioning=%d show_group_started=%d)",
766 wpa_s->p2p_in_provisioning,
767 wpa_s->show_group_started);
768 params.ssids[0].ssid = wpa_s->go_params->ssid;
769 params.ssids[0].ssid_len = wpa_s->go_params->ssid_len;
770 params.num_ssids = 1;
771 goto ssid_list_set;
772 }
773
774 if (wpa_s->p2p_in_invitation) {
775 if (wpa_s->current_ssid) {
776 wpa_printf(MSG_DEBUG, "P2P: Use specific SSID for scan during invitation");
777 params.ssids[0].ssid = wpa_s->current_ssid->ssid;
778 params.ssids[0].ssid_len =
779 wpa_s->current_ssid->ssid_len;
780 params.num_ssids = 1;
781 } else {
782 wpa_printf(MSG_DEBUG, "P2P: No specific SSID known for scan during invitation");
783 }
784 goto ssid_list_set;
785 }
786 #endif /* CONFIG_P2P */
787
788 /* Find the starting point from which to continue scanning */
789 ssid = wpa_s->conf->ssid;
790 if (wpa_s->prev_scan_ssid != WILDCARD_SSID_SCAN) {
791 while (ssid) {
792 if (ssid == wpa_s->prev_scan_ssid) {
793 ssid = ssid->next;
794 break;
795 }
796 ssid = ssid->next;
797 }
798 }
799
800 if (wpa_s->last_scan_req != MANUAL_SCAN_REQ &&
801 #ifdef CONFIG_AP
802 !wpa_s->ap_iface &&
803 #endif /* CONFIG_AP */
804 wpa_s->conf->ap_scan == 2) {
805 wpa_s->connect_without_scan = NULL;
806 wpa_s->prev_scan_wildcard = 0;
807 wpa_supplicant_assoc_try(wpa_s, ssid);
808 return;
809 } else if (wpa_s->conf->ap_scan == 2) {
810 /*
811 * User-initiated scan request in ap_scan == 2; scan with
812 * wildcard SSID.
813 */
814 ssid = NULL;
815 } else if (wpa_s->reattach && wpa_s->current_ssid != NULL) {
816 /*
817 * Perform single-channel single-SSID scan for
818 * reassociate-to-same-BSS operation.
819 */
820 /* Setup SSID */
821 ssid = wpa_s->current_ssid;
822 wpa_hexdump_ascii(MSG_DEBUG, "Scan SSID",
823 ssid->ssid, ssid->ssid_len);
824 params.ssids[0].ssid = ssid->ssid;
825 params.ssids[0].ssid_len = ssid->ssid_len;
826 params.num_ssids = 1;
827
828 /*
829 * Allocate memory for frequency array, allocate one extra
830 * slot for the zero-terminator.
831 */
832 params.freqs = os_malloc(sizeof(int) * 2);
833 if (params.freqs == NULL) {
834 wpa_dbg(wpa_s, MSG_ERROR, "Memory allocation failed");
835 return;
836 }
837 params.freqs[0] = wpa_s->assoc_freq;
838 params.freqs[1] = 0;
839
840 /*
841 * Reset the reattach flag so that we fall back to full scan if
842 * this scan fails.
843 */
844 wpa_s->reattach = 0;
845 } else {
846 struct wpa_ssid *start = ssid, *tssid;
847 int freqs_set = 0;
848 if (ssid == NULL && max_ssids > 1)
849 ssid = wpa_s->conf->ssid;
850 while (ssid) {
851 if (!wpas_network_disabled(wpa_s, ssid) &&
852 ssid->scan_ssid) {
853 wpa_hexdump_ascii(MSG_DEBUG, "Scan SSID",
854 ssid->ssid, ssid->ssid_len);
855 params.ssids[params.num_ssids].ssid =
856 ssid->ssid;
857 params.ssids[params.num_ssids].ssid_len =
858 ssid->ssid_len;
859 params.num_ssids++;
860 if (params.num_ssids + 1 >= max_ssids)
861 break;
862 }
863 ssid = ssid->next;
864 if (ssid == start)
865 break;
866 if (ssid == NULL && max_ssids > 1 &&
867 start != wpa_s->conf->ssid)
868 ssid = wpa_s->conf->ssid;
869 }
870
871 if (wpa_s->scan_id_count &&
872 wpa_s->last_scan_req == MANUAL_SCAN_REQ)
873 wpa_set_scan_ssids(wpa_s, &params, max_ssids);
874
875 for (tssid = wpa_s->conf->ssid;
876 wpa_s->last_scan_req != MANUAL_SCAN_REQ && tssid;
877 tssid = tssid->next) {
878 if (wpas_network_disabled(wpa_s, tssid))
879 continue;
880 if ((params.freqs || !freqs_set) && tssid->scan_freq) {
881 int_array_concat(&params.freqs,
882 tssid->scan_freq);
883 } else {
884 os_free(params.freqs);
885 params.freqs = NULL;
886 }
887 freqs_set = 1;
888 }
889 int_array_sort_unique(params.freqs);
890 }
891
892 if (ssid && max_ssids == 1) {
893 /*
894 * If the driver is limited to 1 SSID at a time interleave
895 * wildcard SSID scans with specific SSID scans to avoid
896 * waiting a long time for a wildcard scan.
897 */
898 if (!wpa_s->prev_scan_wildcard) {
899 params.ssids[0].ssid = NULL;
900 params.ssids[0].ssid_len = 0;
901 wpa_s->prev_scan_wildcard = 1;
902 wpa_dbg(wpa_s, MSG_DEBUG, "Starting AP scan for "
903 "wildcard SSID (Interleave with specific)");
904 } else {
905 wpa_s->prev_scan_ssid = ssid;
906 wpa_s->prev_scan_wildcard = 0;
907 wpa_dbg(wpa_s, MSG_DEBUG,
908 "Starting AP scan for specific SSID: %s",
909 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
910 }
911 } else if (ssid) {
912 /* max_ssids > 1 */
913
914 wpa_s->prev_scan_ssid = ssid;
915 wpa_dbg(wpa_s, MSG_DEBUG, "Include wildcard SSID in "
916 "the scan request");
917 params.num_ssids++;
918 } else if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
919 wpa_s->manual_scan_passive && params.num_ssids == 0) {
920 wpa_dbg(wpa_s, MSG_DEBUG, "Use passive scan based on manual request");
921 } else if (wpa_s->conf->passive_scan) {
922 wpa_dbg(wpa_s, MSG_DEBUG,
923 "Use passive scan based on configuration");
924 } else {
925 wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
926 params.num_ssids++;
927 wpa_dbg(wpa_s, MSG_DEBUG, "Starting AP scan for wildcard "
928 "SSID");
929 }
930
931 ssid_list_set:
932 wpa_supplicant_optimize_freqs(wpa_s, &params);
933 extra_ie = wpa_supplicant_extra_ies(wpa_s);
934
935 if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
936 wpa_s->manual_scan_only_new) {
937 wpa_printf(MSG_DEBUG,
938 "Request driver to clear scan cache due to manual only_new=1 scan");
939 params.only_new_results = 1;
940 }
941
942 if (wpa_s->last_scan_req == MANUAL_SCAN_REQ && params.freqs == NULL &&
943 wpa_s->manual_scan_freqs) {
944 wpa_dbg(wpa_s, MSG_DEBUG, "Limit manual scan to specified channels");
945 params.freqs = wpa_s->manual_scan_freqs;
946 wpa_s->manual_scan_freqs = NULL;
947 }
948
949 if (params.freqs == NULL && wpa_s->next_scan_freqs) {
950 wpa_dbg(wpa_s, MSG_DEBUG, "Optimize scan based on previously "
951 "generated frequency list");
952 params.freqs = wpa_s->next_scan_freqs;
953 } else
954 os_free(wpa_s->next_scan_freqs);
955 wpa_s->next_scan_freqs = NULL;
956 wpa_setband_scan_freqs(wpa_s, &params);
957
958 /* See if user specified frequencies. If so, scan only those. */
959 if (wpa_s->conf->freq_list && !params.freqs) {
960 wpa_dbg(wpa_s, MSG_DEBUG,
961 "Optimize scan based on conf->freq_list");
962 int_array_concat(&params.freqs, wpa_s->conf->freq_list);
963 }
964
965 /* Use current associated channel? */
966 if (wpa_s->conf->scan_cur_freq && !params.freqs) {
967 unsigned int num = wpa_s->num_multichan_concurrent;
968
969 params.freqs = os_calloc(num + 1, sizeof(int));
970 if (params.freqs) {
971 num = get_shared_radio_freqs(wpa_s, params.freqs, num);
972 if (num > 0) {
973 wpa_dbg(wpa_s, MSG_DEBUG, "Scan only the "
974 "current operating channels since "
975 "scan_cur_freq is enabled");
976 } else {
977 os_free(params.freqs);
978 params.freqs = NULL;
979 }
980 }
981 }
982
983 params.filter_ssids = wpa_supplicant_build_filter_ssids(
984 wpa_s->conf, &params.num_filter_ssids);
985 if (extra_ie) {
986 params.extra_ies = wpabuf_head(extra_ie);
987 params.extra_ies_len = wpabuf_len(extra_ie);
988 }
989
990 #ifdef CONFIG_P2P
991 if (wpa_s->p2p_in_provisioning || wpa_s->p2p_in_invitation ||
992 (wpa_s->show_group_started && wpa_s->go_params)) {
993 /*
994 * The interface may not yet be in P2P mode, so we have to
995 * explicitly request P2P probe to disable CCK rates.
996 */
997 params.p2p_probe = 1;
998 }
999 #endif /* CONFIG_P2P */
1000
1001 if (wpa_s->mac_addr_rand_enable & MAC_ADDR_RAND_SCAN) {
1002 params.mac_addr_rand = 1;
1003 if (wpa_s->mac_addr_scan) {
1004 params.mac_addr = wpa_s->mac_addr_scan;
1005 params.mac_addr_mask = wpa_s->mac_addr_scan + ETH_ALEN;
1006 }
1007 }
1008
1009 scan_params = &params;
1010
1011 scan:
1012 #ifdef CONFIG_P2P
1013 /*
1014 * If the driver does not support multi-channel concurrency and a
1015 * virtual interface that shares the same radio with the wpa_s interface
1016 * is operating there may not be need to scan other channels apart from
1017 * the current operating channel on the other virtual interface. Filter
1018 * out other channels in case we are trying to find a connection for a
1019 * station interface when we are not configured to prefer station
1020 * connection and a concurrent operation is already in process.
1021 */
1022 if (wpa_s->scan_for_connection &&
1023 wpa_s->last_scan_req == NORMAL_SCAN_REQ &&
1024 !scan_params->freqs && !params.freqs &&
1025 wpas_is_p2p_prioritized(wpa_s) &&
1026 wpa_s->p2p_group_interface == NOT_P2P_GROUP_INTERFACE &&
1027 non_p2p_network_enabled(wpa_s)) {
1028 unsigned int num = wpa_s->num_multichan_concurrent;
1029
1030 params.freqs = os_calloc(num + 1, sizeof(int));
1031 if (params.freqs) {
1032 num = get_shared_radio_freqs(wpa_s, params.freqs, num);
1033 if (num > 0 && num == wpa_s->num_multichan_concurrent) {
1034 wpa_dbg(wpa_s, MSG_DEBUG, "Scan only the current operating channels since all channels are already used");
1035 } else {
1036 os_free(params.freqs);
1037 params.freqs = NULL;
1038 }
1039 }
1040 }
1041 #endif /* CONFIG_P2P */
1042
1043 ret = wpa_supplicant_trigger_scan(wpa_s, scan_params);
1044
1045 if (ret && wpa_s->last_scan_req == MANUAL_SCAN_REQ && params.freqs &&
1046 !wpa_s->manual_scan_freqs) {
1047 /* Restore manual_scan_freqs for the next attempt */
1048 wpa_s->manual_scan_freqs = params.freqs;
1049 params.freqs = NULL;
1050 }
1051
1052 wpabuf_free(extra_ie);
1053 os_free(params.freqs);
1054 os_free(params.filter_ssids);
1055
1056 if (ret) {
1057 wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate AP scan");
1058 if (wpa_s->scan_prev_wpa_state != wpa_s->wpa_state)
1059 wpa_supplicant_set_state(wpa_s,
1060 wpa_s->scan_prev_wpa_state);
1061 /* Restore scan_req since we will try to scan again */
1062 wpa_s->scan_req = wpa_s->last_scan_req;
1063 wpa_supplicant_req_scan(wpa_s, 1, 0);
1064 } else {
1065 wpa_s->scan_for_connection = 0;
1066 #ifdef CONFIG_INTERWORKING
1067 wpa_s->interworking_fast_assoc_tried = 0;
1068 #endif /* CONFIG_INTERWORKING */
1069 }
1070 }
1071
1072
1073 void wpa_supplicant_update_scan_int(struct wpa_supplicant *wpa_s, int sec)
1074 {
1075 struct os_reltime remaining, new_int;
1076 int cancelled;
1077
1078 cancelled = eloop_cancel_timeout_one(wpa_supplicant_scan, wpa_s, NULL,
1079 &remaining);
1080
1081 new_int.sec = sec;
1082 new_int.usec = 0;
1083 if (cancelled && os_reltime_before(&remaining, &new_int)) {
1084 new_int.sec = remaining.sec;
1085 new_int.usec = remaining.usec;
1086 }
1087
1088 if (cancelled) {
1089 eloop_register_timeout(new_int.sec, new_int.usec,
1090 wpa_supplicant_scan, wpa_s, NULL);
1091 }
1092 wpa_s->scan_interval = sec;
1093 }
1094
1095
1096 /**
1097 * wpa_supplicant_req_scan - Schedule a scan for neighboring access points
1098 * @wpa_s: Pointer to wpa_supplicant data
1099 * @sec: Number of seconds after which to scan
1100 * @usec: Number of microseconds after which to scan
1101 *
1102 * This function is used to schedule a scan for neighboring access points after
1103 * the specified time.
1104 */
1105 void wpa_supplicant_req_scan(struct wpa_supplicant *wpa_s, int sec, int usec)
1106 {
1107 int res;
1108
1109 if (wpa_s->p2p_mgmt) {
1110 wpa_dbg(wpa_s, MSG_DEBUG,
1111 "Ignore scan request (%d.%06d sec) on p2p_mgmt interface",
1112 sec, usec);
1113 return;
1114 }
1115
1116 res = eloop_deplete_timeout(sec, usec, wpa_supplicant_scan, wpa_s,
1117 NULL);
1118 if (res == 1) {
1119 wpa_dbg(wpa_s, MSG_DEBUG, "Rescheduling scan request: %d.%06d sec",
1120 sec, usec);
1121 } else if (res == 0) {
1122 wpa_dbg(wpa_s, MSG_DEBUG, "Ignore new scan request for %d.%06d sec since an earlier request is scheduled to trigger sooner",
1123 sec, usec);
1124 } else {
1125 wpa_dbg(wpa_s, MSG_DEBUG, "Setting scan request: %d.%06d sec",
1126 sec, usec);
1127 eloop_register_timeout(sec, usec, wpa_supplicant_scan, wpa_s, NULL);
1128 }
1129 }
1130
1131
1132 /**
1133 * wpa_supplicant_delayed_sched_scan - Request a delayed scheduled scan
1134 * @wpa_s: Pointer to wpa_supplicant data
1135 * @sec: Number of seconds after which to scan
1136 * @usec: Number of microseconds after which to scan
1137 * Returns: 0 on success or -1 otherwise
1138 *
1139 * This function is used to schedule periodic scans for neighboring
1140 * access points after the specified time.
1141 */
1142 int wpa_supplicant_delayed_sched_scan(struct wpa_supplicant *wpa_s,
1143 int sec, int usec)
1144 {
1145 if (!wpa_s->sched_scan_supported)
1146 return -1;
1147
1148 eloop_register_timeout(sec, usec,
1149 wpa_supplicant_delayed_sched_scan_timeout,
1150 wpa_s, NULL);
1151
1152 return 0;
1153 }
1154
1155
1156 /**
1157 * wpa_supplicant_req_sched_scan - Start a periodic scheduled scan
1158 * @wpa_s: Pointer to wpa_supplicant data
1159 * Returns: 0 is sched_scan was started or -1 otherwise
1160 *
1161 * This function is used to schedule periodic scans for neighboring
1162 * access points repeating the scan continuously.
1163 */
1164 int wpa_supplicant_req_sched_scan(struct wpa_supplicant *wpa_s)
1165 {
1166 struct wpa_driver_scan_params params;
1167 struct wpa_driver_scan_params *scan_params;
1168 enum wpa_states prev_state;
1169 struct wpa_ssid *ssid = NULL;
1170 struct wpabuf *extra_ie = NULL;
1171 int ret;
1172 unsigned int max_sched_scan_ssids;
1173 int wildcard = 0;
1174 int need_ssids;
1175 struct sched_scan_plan scan_plan;
1176
1177 if (!wpa_s->sched_scan_supported)
1178 return -1;
1179
1180 if (wpa_s->max_sched_scan_ssids > WPAS_MAX_SCAN_SSIDS)
1181 max_sched_scan_ssids = WPAS_MAX_SCAN_SSIDS;
1182 else
1183 max_sched_scan_ssids = wpa_s->max_sched_scan_ssids;
1184 if (max_sched_scan_ssids < 1 || wpa_s->conf->disable_scan_offload)
1185 return -1;
1186
1187 if (wpa_s->sched_scanning) {
1188 wpa_dbg(wpa_s, MSG_DEBUG, "Already sched scanning");
1189 return 0;
1190 }
1191
1192 need_ssids = 0;
1193 for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
1194 if (!wpas_network_disabled(wpa_s, ssid) && !ssid->scan_ssid) {
1195 /* Use wildcard SSID to find this network */
1196 wildcard = 1;
1197 } else if (!wpas_network_disabled(wpa_s, ssid) &&
1198 ssid->ssid_len)
1199 need_ssids++;
1200
1201 #ifdef CONFIG_WPS
1202 if (!wpas_network_disabled(wpa_s, ssid) &&
1203 ssid->key_mgmt == WPA_KEY_MGMT_WPS) {
1204 /*
1205 * Normal scan is more reliable and faster for WPS
1206 * operations and since these are for short periods of
1207 * time, the benefit of trying to use sched_scan would
1208 * be limited.
1209 */
1210 wpa_dbg(wpa_s, MSG_DEBUG, "Use normal scan instead of "
1211 "sched_scan for WPS");
1212 return -1;
1213 }
1214 #endif /* CONFIG_WPS */
1215 }
1216 if (wildcard)
1217 need_ssids++;
1218
1219 if (wpa_s->normal_scans < 3 &&
1220 (need_ssids <= wpa_s->max_scan_ssids ||
1221 wpa_s->max_scan_ssids >= (int) max_sched_scan_ssids)) {
1222 /*
1223 * When normal scan can speed up operations, use that for the
1224 * first operations before starting the sched_scan to allow
1225 * user space sleep more. We do this only if the normal scan
1226 * has functionality that is suitable for this or if the
1227 * sched_scan does not have better support for multiple SSIDs.
1228 */
1229 wpa_dbg(wpa_s, MSG_DEBUG, "Use normal scan instead of "
1230 "sched_scan for initial scans (normal_scans=%d)",
1231 wpa_s->normal_scans);
1232 return -1;
1233 }
1234
1235 os_memset(&params, 0, sizeof(params));
1236
1237 /* If we can't allocate space for the filters, we just don't filter */
1238 params.filter_ssids = os_calloc(wpa_s->max_match_sets,
1239 sizeof(struct wpa_driver_scan_filter));
1240
1241 prev_state = wpa_s->wpa_state;
1242 if (wpa_s->wpa_state == WPA_DISCONNECTED ||
1243 wpa_s->wpa_state == WPA_INACTIVE)
1244 wpa_supplicant_set_state(wpa_s, WPA_SCANNING);
1245
1246 if (wpa_s->autoscan_params != NULL) {
1247 scan_params = wpa_s->autoscan_params;
1248 goto scan;
1249 }
1250
1251 /* Find the starting point from which to continue scanning */
1252 ssid = wpa_s->conf->ssid;
1253 if (wpa_s->prev_sched_ssid) {
1254 while (ssid) {
1255 if (ssid == wpa_s->prev_sched_ssid) {
1256 ssid = ssid->next;
1257 break;
1258 }
1259 ssid = ssid->next;
1260 }
1261 }
1262
1263 if (!ssid || !wpa_s->prev_sched_ssid) {
1264 wpa_dbg(wpa_s, MSG_DEBUG, "Beginning of SSID list");
1265 wpa_s->sched_scan_timeout = max_sched_scan_ssids * 2;
1266 wpa_s->first_sched_scan = 1;
1267 ssid = wpa_s->conf->ssid;
1268 wpa_s->prev_sched_ssid = ssid;
1269 }
1270
1271 if (wildcard) {
1272 wpa_dbg(wpa_s, MSG_DEBUG, "Add wildcard SSID to sched_scan");
1273 params.num_ssids++;
1274 }
1275
1276 while (ssid) {
1277 if (wpas_network_disabled(wpa_s, ssid))
1278 goto next;
1279
1280 if (params.num_filter_ssids < wpa_s->max_match_sets &&
1281 params.filter_ssids && ssid->ssid && ssid->ssid_len) {
1282 wpa_dbg(wpa_s, MSG_DEBUG, "add to filter ssid: %s",
1283 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
1284 os_memcpy(params.filter_ssids[params.num_filter_ssids].ssid,
1285 ssid->ssid, ssid->ssid_len);
1286 params.filter_ssids[params.num_filter_ssids].ssid_len =
1287 ssid->ssid_len;
1288 params.num_filter_ssids++;
1289 } else if (params.filter_ssids && ssid->ssid && ssid->ssid_len)
1290 {
1291 wpa_dbg(wpa_s, MSG_DEBUG, "Not enough room for SSID "
1292 "filter for sched_scan - drop filter");
1293 os_free(params.filter_ssids);
1294 params.filter_ssids = NULL;
1295 params.num_filter_ssids = 0;
1296 }
1297
1298 if (ssid->scan_ssid && ssid->ssid && ssid->ssid_len) {
1299 if (params.num_ssids == max_sched_scan_ssids)
1300 break; /* only room for broadcast SSID */
1301 wpa_dbg(wpa_s, MSG_DEBUG,
1302 "add to active scan ssid: %s",
1303 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
1304 params.ssids[params.num_ssids].ssid =
1305 ssid->ssid;
1306 params.ssids[params.num_ssids].ssid_len =
1307 ssid->ssid_len;
1308 params.num_ssids++;
1309 if (params.num_ssids >= max_sched_scan_ssids) {
1310 wpa_s->prev_sched_ssid = ssid;
1311 do {
1312 ssid = ssid->next;
1313 } while (ssid &&
1314 (wpas_network_disabled(wpa_s, ssid) ||
1315 !ssid->scan_ssid));
1316 break;
1317 }
1318 }
1319
1320 next:
1321 wpa_s->prev_sched_ssid = ssid;
1322 ssid = ssid->next;
1323 }
1324
1325 if (params.num_filter_ssids == 0) {
1326 os_free(params.filter_ssids);
1327 params.filter_ssids = NULL;
1328 }
1329
1330 extra_ie = wpa_supplicant_extra_ies(wpa_s);
1331 if (extra_ie) {
1332 params.extra_ies = wpabuf_head(extra_ie);
1333 params.extra_ies_len = wpabuf_len(extra_ie);
1334 }
1335
1336 if (wpa_s->conf->filter_rssi)
1337 params.filter_rssi = wpa_s->conf->filter_rssi;
1338
1339 /* See if user specified frequencies. If so, scan only those. */
1340 if (wpa_s->conf->freq_list && !params.freqs) {
1341 wpa_dbg(wpa_s, MSG_DEBUG,
1342 "Optimize scan based on conf->freq_list");
1343 int_array_concat(&params.freqs, wpa_s->conf->freq_list);
1344 }
1345
1346 scan_params = &params;
1347
1348 scan:
1349 wpa_s->sched_scan_timed_out = 0;
1350
1351 /*
1352 * We cannot support multiple scan plans if the scan request includes
1353 * too many SSID's, so in this case use only the last scan plan and make
1354 * it run infinitely. It will be stopped by the timeout.
1355 */
1356 if (wpa_s->sched_scan_plans_num == 1 ||
1357 (wpa_s->sched_scan_plans_num && !ssid && wpa_s->first_sched_scan)) {
1358 params.sched_scan_plans = wpa_s->sched_scan_plans;
1359 params.sched_scan_plans_num = wpa_s->sched_scan_plans_num;
1360 } else if (wpa_s->sched_scan_plans_num > 1) {
1361 wpa_dbg(wpa_s, MSG_DEBUG,
1362 "Too many SSIDs. Default to using single scheduled_scan plan");
1363 params.sched_scan_plans =
1364 &wpa_s->sched_scan_plans[wpa_s->sched_scan_plans_num -
1365 1];
1366 params.sched_scan_plans_num = 1;
1367 } else {
1368 if (wpa_s->conf->sched_scan_interval)
1369 scan_plan.interval = wpa_s->conf->sched_scan_interval;
1370 else
1371 scan_plan.interval = 10;
1372
1373 if (scan_plan.interval > wpa_s->max_sched_scan_plan_interval) {
1374 wpa_printf(MSG_WARNING,
1375 "Scan interval too long(%u), use the maximum allowed(%u)",
1376 scan_plan.interval,
1377 wpa_s->max_sched_scan_plan_interval);
1378 scan_plan.interval =
1379 wpa_s->max_sched_scan_plan_interval;
1380 }
1381
1382 scan_plan.iterations = 0;
1383 params.sched_scan_plans = &scan_plan;
1384 params.sched_scan_plans_num = 1;
1385 }
1386
1387 if (ssid || !wpa_s->first_sched_scan) {
1388 wpa_dbg(wpa_s, MSG_DEBUG,
1389 "Starting sched scan: interval %u timeout %d",
1390 params.sched_scan_plans[0].interval,
1391 wpa_s->sched_scan_timeout);
1392 } else {
1393 wpa_dbg(wpa_s, MSG_DEBUG, "Starting sched scan (no timeout)");
1394 }
1395
1396 wpa_setband_scan_freqs(wpa_s, scan_params);
1397
1398 if (wpa_s->mac_addr_rand_enable & MAC_ADDR_RAND_SCHED_SCAN) {
1399 params.mac_addr_rand = 1;
1400 if (wpa_s->mac_addr_sched_scan) {
1401 params.mac_addr = wpa_s->mac_addr_sched_scan;
1402 params.mac_addr_mask = wpa_s->mac_addr_sched_scan +
1403 ETH_ALEN;
1404 }
1405 }
1406
1407 ret = wpa_supplicant_start_sched_scan(wpa_s, scan_params);
1408 wpabuf_free(extra_ie);
1409 os_free(params.filter_ssids);
1410 if (ret) {
1411 wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate sched scan");
1412 if (prev_state != wpa_s->wpa_state)
1413 wpa_supplicant_set_state(wpa_s, prev_state);
1414 return ret;
1415 }
1416
1417 /* If we have more SSIDs to scan, add a timeout so we scan them too */
1418 if (ssid || !wpa_s->first_sched_scan) {
1419 wpa_s->sched_scan_timed_out = 0;
1420 eloop_register_timeout(wpa_s->sched_scan_timeout, 0,
1421 wpa_supplicant_sched_scan_timeout,
1422 wpa_s, NULL);
1423 wpa_s->first_sched_scan = 0;
1424 wpa_s->sched_scan_timeout /= 2;
1425 params.sched_scan_plans[0].interval *= 2;
1426 if ((unsigned int) wpa_s->sched_scan_timeout <
1427 params.sched_scan_plans[0].interval ||
1428 params.sched_scan_plans[0].interval >
1429 wpa_s->max_sched_scan_plan_interval) {
1430 params.sched_scan_plans[0].interval = 10;
1431 wpa_s->sched_scan_timeout = max_sched_scan_ssids * 2;
1432 }
1433 }
1434
1435 /* If there is no more ssids, start next time from the beginning */
1436 if (!ssid)
1437 wpa_s->prev_sched_ssid = NULL;
1438
1439 return 0;
1440 }
1441
1442
1443 /**
1444 * wpa_supplicant_cancel_scan - Cancel a scheduled scan request
1445 * @wpa_s: Pointer to wpa_supplicant data
1446 *
1447 * This function is used to cancel a scan request scheduled with
1448 * wpa_supplicant_req_scan().
1449 */
1450 void wpa_supplicant_cancel_scan(struct wpa_supplicant *wpa_s)
1451 {
1452 wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling scan request");
1453 eloop_cancel_timeout(wpa_supplicant_scan, wpa_s, NULL);
1454 }
1455
1456
1457 /**
1458 * wpa_supplicant_cancel_delayed_sched_scan - Stop a delayed scheduled scan
1459 * @wpa_s: Pointer to wpa_supplicant data
1460 *
1461 * This function is used to stop a delayed scheduled scan.
1462 */
1463 void wpa_supplicant_cancel_delayed_sched_scan(struct wpa_supplicant *wpa_s)
1464 {
1465 if (!wpa_s->sched_scan_supported)
1466 return;
1467
1468 wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling delayed sched scan");
1469 eloop_cancel_timeout(wpa_supplicant_delayed_sched_scan_timeout,
1470 wpa_s, NULL);
1471 }
1472
1473
1474 /**
1475 * wpa_supplicant_cancel_sched_scan - Stop running scheduled scans
1476 * @wpa_s: Pointer to wpa_supplicant data
1477 *
1478 * This function is used to stop a periodic scheduled scan.
1479 */
1480 void wpa_supplicant_cancel_sched_scan(struct wpa_supplicant *wpa_s)
1481 {
1482 if (!wpa_s->sched_scanning)
1483 return;
1484
1485 wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling sched scan");
1486 eloop_cancel_timeout(wpa_supplicant_sched_scan_timeout, wpa_s, NULL);
1487 wpa_supplicant_stop_sched_scan(wpa_s);
1488 }
1489
1490
1491 /**
1492 * wpa_supplicant_notify_scanning - Indicate possible scan state change
1493 * @wpa_s: Pointer to wpa_supplicant data
1494 * @scanning: Whether scanning is currently in progress
1495 *
1496 * This function is to generate scanning notifycations. It is called whenever
1497 * there may have been a change in scanning (scan started, completed, stopped).
1498 * wpas_notify_scanning() is called whenever the scanning state changed from the
1499 * previously notified state.
1500 */
1501 void wpa_supplicant_notify_scanning(struct wpa_supplicant *wpa_s,
1502 int scanning)
1503 {
1504 if (wpa_s->scanning != scanning) {
1505 wpa_s->scanning = scanning;
1506 wpas_notify_scanning(wpa_s);
1507 }
1508 }
1509
1510
1511 static int wpa_scan_get_max_rate(const struct wpa_scan_res *res)
1512 {
1513 int rate = 0;
1514 const u8 *ie;
1515 int i;
1516
1517 ie = wpa_scan_get_ie(res, WLAN_EID_SUPP_RATES);
1518 for (i = 0; ie && i < ie[1]; i++) {
1519 if ((ie[i + 2] & 0x7f) > rate)
1520 rate = ie[i + 2] & 0x7f;
1521 }
1522
1523 ie = wpa_scan_get_ie(res, WLAN_EID_EXT_SUPP_RATES);
1524 for (i = 0; ie && i < ie[1]; i++) {
1525 if ((ie[i + 2] & 0x7f) > rate)
1526 rate = ie[i + 2] & 0x7f;
1527 }
1528
1529 return rate;
1530 }
1531
1532
1533 /**
1534 * wpa_scan_get_ie - Fetch a specified information element from a scan result
1535 * @res: Scan result entry
1536 * @ie: Information element identitifier (WLAN_EID_*)
1537 * Returns: Pointer to the information element (id field) or %NULL if not found
1538 *
1539 * This function returns the first matching information element in the scan
1540 * result.
1541 */
1542 const u8 * wpa_scan_get_ie(const struct wpa_scan_res *res, u8 ie)
1543 {
1544 return get_ie((const u8 *) (res + 1), res->ie_len, ie);
1545 }
1546
1547
1548 /**
1549 * wpa_scan_get_vendor_ie - Fetch vendor information element from a scan result
1550 * @res: Scan result entry
1551 * @vendor_type: Vendor type (four octets starting the IE payload)
1552 * Returns: Pointer to the information element (id field) or %NULL if not found
1553 *
1554 * This function returns the first matching information element in the scan
1555 * result.
1556 */
1557 const u8 * wpa_scan_get_vendor_ie(const struct wpa_scan_res *res,
1558 u32 vendor_type)
1559 {
1560 const u8 *end, *pos;
1561
1562 pos = (const u8 *) (res + 1);
1563 end = pos + res->ie_len;
1564
1565 while (end - pos > 1) {
1566 if (2 + pos[1] > end - pos)
1567 break;
1568 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1569 vendor_type == WPA_GET_BE32(&pos[2]))
1570 return pos;
1571 pos += 2 + pos[1];
1572 }
1573
1574 return NULL;
1575 }
1576
1577
1578 /**
1579 * wpa_scan_get_vendor_ie_beacon - Fetch vendor information from a scan result
1580 * @res: Scan result entry
1581 * @vendor_type: Vendor type (four octets starting the IE payload)
1582 * Returns: Pointer to the information element (id field) or %NULL if not found
1583 *
1584 * This function returns the first matching information element in the scan
1585 * result.
1586 *
1587 * This function is like wpa_scan_get_vendor_ie(), but uses IE buffer only
1588 * from Beacon frames instead of either Beacon or Probe Response frames.
1589 */
1590 const u8 * wpa_scan_get_vendor_ie_beacon(const struct wpa_scan_res *res,
1591 u32 vendor_type)
1592 {
1593 const u8 *end, *pos;
1594
1595 if (res->beacon_ie_len == 0)
1596 return NULL;
1597
1598 pos = (const u8 *) (res + 1);
1599 pos += res->ie_len;
1600 end = pos + res->beacon_ie_len;
1601
1602 while (end - pos > 1) {
1603 if (2 + pos[1] > end - pos)
1604 break;
1605 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1606 vendor_type == WPA_GET_BE32(&pos[2]))
1607 return pos;
1608 pos += 2 + pos[1];
1609 }
1610
1611 return NULL;
1612 }
1613
1614
1615 /**
1616 * wpa_scan_get_vendor_ie_multi - Fetch vendor IE data from a scan result
1617 * @res: Scan result entry
1618 * @vendor_type: Vendor type (four octets starting the IE payload)
1619 * Returns: Pointer to the information element payload or %NULL if not found
1620 *
1621 * This function returns concatenated payload of possibly fragmented vendor
1622 * specific information elements in the scan result. The caller is responsible
1623 * for freeing the returned buffer.
1624 */
1625 struct wpabuf * wpa_scan_get_vendor_ie_multi(const struct wpa_scan_res *res,
1626 u32 vendor_type)
1627 {
1628 struct wpabuf *buf;
1629 const u8 *end, *pos;
1630
1631 buf = wpabuf_alloc(res->ie_len);
1632 if (buf == NULL)
1633 return NULL;
1634
1635 pos = (const u8 *) (res + 1);
1636 end = pos + res->ie_len;
1637
1638 while (end - pos > 1) {
1639 if (2 + pos[1] > end - pos)
1640 break;
1641 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1642 vendor_type == WPA_GET_BE32(&pos[2]))
1643 wpabuf_put_data(buf, pos + 2 + 4, pos[1] - 4);
1644 pos += 2 + pos[1];
1645 }
1646
1647 if (wpabuf_len(buf) == 0) {
1648 wpabuf_free(buf);
1649 buf = NULL;
1650 }
1651
1652 return buf;
1653 }
1654
1655
1656 /*
1657 * Channels with a great SNR can operate at full rate. What is a great SNR?
1658 * This doc https://supportforums.cisco.com/docs/DOC-12954 says, "the general
1659 * rule of thumb is that any SNR above 20 is good." This one
1660 * http://www.cisco.com/en/US/tech/tk722/tk809/technologies_q_and_a_item09186a00805e9a96.shtml#qa23
1661 * recommends 25 as a minimum SNR for 54 Mbps data rate. 30 is chosen here as a
1662 * conservative value.
1663 */
1664 #define GREAT_SNR 30
1665
1666 #define IS_5GHZ(n) (n > 4000)
1667
1668 /* Compare function for sorting scan results. Return >0 if @b is considered
1669 * better. */
1670 static int wpa_scan_result_compar(const void *a, const void *b)
1671 {
1672 #define MIN(a,b) a < b ? a : b
1673 struct wpa_scan_res **_wa = (void *) a;
1674 struct wpa_scan_res **_wb = (void *) b;
1675 struct wpa_scan_res *wa = *_wa;
1676 struct wpa_scan_res *wb = *_wb;
1677 int wpa_a, wpa_b;
1678 int snr_a, snr_b, snr_a_full, snr_b_full;
1679
1680 /* WPA/WPA2 support preferred */
1681 wpa_a = wpa_scan_get_vendor_ie(wa, WPA_IE_VENDOR_TYPE) != NULL ||
1682 wpa_scan_get_ie(wa, WLAN_EID_RSN) != NULL;
1683 wpa_b = wpa_scan_get_vendor_ie(wb, WPA_IE_VENDOR_TYPE) != NULL ||
1684 wpa_scan_get_ie(wb, WLAN_EID_RSN) != NULL;
1685
1686 if (wpa_b && !wpa_a)
1687 return 1;
1688 if (!wpa_b && wpa_a)
1689 return -1;
1690
1691 /* privacy support preferred */
1692 if ((wa->caps & IEEE80211_CAP_PRIVACY) == 0 &&
1693 (wb->caps & IEEE80211_CAP_PRIVACY))
1694 return 1;
1695 if ((wa->caps & IEEE80211_CAP_PRIVACY) &&
1696 (wb->caps & IEEE80211_CAP_PRIVACY) == 0)
1697 return -1;
1698
1699 if (wa->flags & wb->flags & WPA_SCAN_LEVEL_DBM) {
1700 snr_a_full = wa->snr;
1701 snr_a = MIN(wa->snr, GREAT_SNR);
1702 snr_b_full = wb->snr;
1703 snr_b = MIN(wb->snr, GREAT_SNR);
1704 } else {
1705 /* Level is not in dBm, so we can't calculate
1706 * SNR. Just use raw level (units unknown). */
1707 snr_a = snr_a_full = wa->level;
1708 snr_b = snr_b_full = wb->level;
1709 }
1710
1711 /* if SNR is close, decide by max rate or frequency band */
1712 if ((snr_a && snr_b && abs(snr_b - snr_a) < 5) ||
1713 (wa->qual && wb->qual && abs(wb->qual - wa->qual) < 10)) {
1714 if (wa->est_throughput != wb->est_throughput)
1715 return wb->est_throughput - wa->est_throughput;
1716 if (IS_5GHZ(wa->freq) ^ IS_5GHZ(wb->freq))
1717 return IS_5GHZ(wa->freq) ? -1 : 1;
1718 }
1719
1720 /* all things being equal, use SNR; if SNRs are
1721 * identical, use quality values since some drivers may only report
1722 * that value and leave the signal level zero */
1723 if (snr_b_full == snr_a_full)
1724 return wb->qual - wa->qual;
1725 return snr_b_full - snr_a_full;
1726 #undef MIN
1727 }
1728
1729
1730 #ifdef CONFIG_WPS
1731 /* Compare function for sorting scan results when searching a WPS AP for
1732 * provisioning. Return >0 if @b is considered better. */
1733 static int wpa_scan_result_wps_compar(const void *a, const void *b)
1734 {
1735 struct wpa_scan_res **_wa = (void *) a;
1736 struct wpa_scan_res **_wb = (void *) b;
1737 struct wpa_scan_res *wa = *_wa;
1738 struct wpa_scan_res *wb = *_wb;
1739 int uses_wps_a, uses_wps_b;
1740 struct wpabuf *wps_a, *wps_b;
1741 int res;
1742
1743 /* Optimization - check WPS IE existence before allocated memory and
1744 * doing full reassembly. */
1745 uses_wps_a = wpa_scan_get_vendor_ie(wa, WPS_IE_VENDOR_TYPE) != NULL;
1746 uses_wps_b = wpa_scan_get_vendor_ie(wb, WPS_IE_VENDOR_TYPE) != NULL;
1747 if (uses_wps_a && !uses_wps_b)
1748 return -1;
1749 if (!uses_wps_a && uses_wps_b)
1750 return 1;
1751
1752 if (uses_wps_a && uses_wps_b) {
1753 wps_a = wpa_scan_get_vendor_ie_multi(wa, WPS_IE_VENDOR_TYPE);
1754 wps_b = wpa_scan_get_vendor_ie_multi(wb, WPS_IE_VENDOR_TYPE);
1755 res = wps_ap_priority_compar(wps_a, wps_b);
1756 wpabuf_free(wps_a);
1757 wpabuf_free(wps_b);
1758 if (res)
1759 return res;
1760 }
1761
1762 /*
1763 * Do not use current AP security policy as a sorting criteria during
1764 * WPS provisioning step since the AP may get reconfigured at the
1765 * completion of provisioning.
1766 */
1767
1768 /* all things being equal, use signal level; if signal levels are
1769 * identical, use quality values since some drivers may only report
1770 * that value and leave the signal level zero */
1771 if (wb->level == wa->level)
1772 return wb->qual - wa->qual;
1773 return wb->level - wa->level;
1774 }
1775 #endif /* CONFIG_WPS */
1776
1777
1778 static void dump_scan_res(struct wpa_scan_results *scan_res)
1779 {
1780 #ifndef CONFIG_NO_STDOUT_DEBUG
1781 size_t i;
1782
1783 if (scan_res->res == NULL || scan_res->num == 0)
1784 return;
1785
1786 wpa_printf(MSG_EXCESSIVE, "Sorted scan results");
1787
1788 for (i = 0; i < scan_res->num; i++) {
1789 struct wpa_scan_res *r = scan_res->res[i];
1790 u8 *pos;
1791 if (r->flags & WPA_SCAN_LEVEL_DBM) {
1792 int noise_valid = !(r->flags & WPA_SCAN_NOISE_INVALID);
1793
1794 wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d "
1795 "noise=%d%s level=%d snr=%d%s flags=0x%x age=%u est=%u",
1796 MAC2STR(r->bssid), r->freq, r->qual,
1797 r->noise, noise_valid ? "" : "~", r->level,
1798 r->snr, r->snr >= GREAT_SNR ? "*" : "",
1799 r->flags,
1800 r->age, r->est_throughput);
1801 } else {
1802 wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d "
1803 "noise=%d level=%d flags=0x%x age=%u est=%u",
1804 MAC2STR(r->bssid), r->freq, r->qual,
1805 r->noise, r->level, r->flags, r->age,
1806 r->est_throughput);
1807 }
1808 pos = (u8 *) (r + 1);
1809 if (r->ie_len)
1810 wpa_hexdump(MSG_EXCESSIVE, "IEs", pos, r->ie_len);
1811 pos += r->ie_len;
1812 if (r->beacon_ie_len)
1813 wpa_hexdump(MSG_EXCESSIVE, "Beacon IEs",
1814 pos, r->beacon_ie_len);
1815 }
1816 #endif /* CONFIG_NO_STDOUT_DEBUG */
1817 }
1818
1819
1820 /**
1821 * wpa_supplicant_filter_bssid_match - Is the specified BSSID allowed
1822 * @wpa_s: Pointer to wpa_supplicant data
1823 * @bssid: BSSID to check
1824 * Returns: 0 if the BSSID is filtered or 1 if not
1825 *
1826 * This function is used to filter out specific BSSIDs from scan reslts mainly
1827 * for testing purposes (SET bssid_filter ctrl_iface command).
1828 */
1829 int wpa_supplicant_filter_bssid_match(struct wpa_supplicant *wpa_s,
1830 const u8 *bssid)
1831 {
1832 size_t i;
1833
1834 if (wpa_s->bssid_filter == NULL)
1835 return 1;
1836
1837 for (i = 0; i < wpa_s->bssid_filter_count; i++) {
1838 if (os_memcmp(wpa_s->bssid_filter + i * ETH_ALEN, bssid,
1839 ETH_ALEN) == 0)
1840 return 1;
1841 }
1842
1843 return 0;
1844 }
1845
1846
1847 static void filter_scan_res(struct wpa_supplicant *wpa_s,
1848 struct wpa_scan_results *res)
1849 {
1850 size_t i, j;
1851
1852 if (wpa_s->bssid_filter == NULL)
1853 return;
1854
1855 for (i = 0, j = 0; i < res->num; i++) {
1856 if (wpa_supplicant_filter_bssid_match(wpa_s,
1857 res->res[i]->bssid)) {
1858 res->res[j++] = res->res[i];
1859 } else {
1860 os_free(res->res[i]);
1861 res->res[i] = NULL;
1862 }
1863 }
1864
1865 if (res->num != j) {
1866 wpa_printf(MSG_DEBUG, "Filtered out %d scan results",
1867 (int) (res->num - j));
1868 res->num = j;
1869 }
1870 }
1871
1872
1873 /*
1874 * Noise floor values to use when we have signal strength
1875 * measurements, but no noise floor measurments. These values were
1876 * measured in an office environment with many APs.
1877 */
1878 #define DEFAULT_NOISE_FLOOR_2GHZ (-89)
1879 #define DEFAULT_NOISE_FLOOR_5GHZ (-92)
1880
1881 static void scan_snr(struct wpa_scan_res *res)
1882 {
1883 if (res->flags & WPA_SCAN_NOISE_INVALID) {
1884 res->noise = IS_5GHZ(res->freq) ?
1885 DEFAULT_NOISE_FLOOR_5GHZ :
1886 DEFAULT_NOISE_FLOOR_2GHZ;
1887 }
1888
1889 if (res->flags & WPA_SCAN_LEVEL_DBM) {
1890 res->snr = res->level - res->noise;
1891 } else {
1892 /* Level is not in dBm, so we can't calculate
1893 * SNR. Just use raw level (units unknown). */
1894 res->snr = res->level;
1895 }
1896 }
1897
1898
1899 static unsigned int max_ht20_rate(int snr)
1900 {
1901 if (snr < 6)
1902 return 6500; /* HT20 MCS0 */
1903 if (snr < 8)
1904 return 13000; /* HT20 MCS1 */
1905 if (snr < 13)
1906 return 19500; /* HT20 MCS2 */
1907 if (snr < 17)
1908 return 26000; /* HT20 MCS3 */
1909 if (snr < 20)
1910 return 39000; /* HT20 MCS4 */
1911 if (snr < 23)
1912 return 52000; /* HT20 MCS5 */
1913 if (snr < 24)
1914 return 58500; /* HT20 MCS6 */
1915 return 65000; /* HT20 MCS7 */
1916 }
1917
1918
1919 static unsigned int max_ht40_rate(int snr)
1920 {
1921 if (snr < 3)
1922 return 13500; /* HT40 MCS0 */
1923 if (snr < 6)
1924 return 27000; /* HT40 MCS1 */
1925 if (snr < 10)
1926 return 40500; /* HT40 MCS2 */
1927 if (snr < 15)
1928 return 54000; /* HT40 MCS3 */
1929 if (snr < 17)
1930 return 81000; /* HT40 MCS4 */
1931 if (snr < 22)
1932 return 108000; /* HT40 MCS5 */
1933 if (snr < 24)
1934 return 121500; /* HT40 MCS6 */
1935 return 135000; /* HT40 MCS7 */
1936 }
1937
1938
1939 static unsigned int max_vht80_rate(int snr)
1940 {
1941 if (snr < 1)
1942 return 0;
1943 if (snr < 2)
1944 return 29300; /* VHT80 MCS0 */
1945 if (snr < 5)
1946 return 58500; /* VHT80 MCS1 */
1947 if (snr < 9)
1948 return 87800; /* VHT80 MCS2 */
1949 if (snr < 11)
1950 return 117000; /* VHT80 MCS3 */
1951 if (snr < 15)
1952 return 175500; /* VHT80 MCS4 */
1953 if (snr < 16)
1954 return 234000; /* VHT80 MCS5 */
1955 if (snr < 18)
1956 return 263300; /* VHT80 MCS6 */
1957 if (snr < 20)
1958 return 292500; /* VHT80 MCS7 */
1959 if (snr < 22)
1960 return 351000; /* VHT80 MCS8 */
1961 return 390000; /* VHT80 MCS9 */
1962 }
1963
1964
1965 static void scan_est_throughput(struct wpa_supplicant *wpa_s,
1966 struct wpa_scan_res *res)
1967 {
1968 enum local_hw_capab capab = wpa_s->hw_capab;
1969 int rate; /* max legacy rate in 500 kb/s units */
1970 const u8 *ie;
1971 unsigned int est, tmp;
1972 int snr = res->snr;
1973
1974 if (res->est_throughput)
1975 return;
1976
1977 /* Get maximum legacy rate */
1978 rate = wpa_scan_get_max_rate(res);
1979
1980 /* Limit based on estimated SNR */
1981 if (rate > 1 * 2 && snr < 1)
1982 rate = 1 * 2;
1983 else if (rate > 2 * 2 && snr < 4)
1984 rate = 2 * 2;
1985 else if (rate > 6 * 2 && snr < 5)
1986 rate = 6 * 2;
1987 else if (rate > 9 * 2 && snr < 6)
1988 rate = 9 * 2;
1989 else if (rate > 12 * 2 && snr < 7)
1990 rate = 12 * 2;
1991 else if (rate > 18 * 2 && snr < 10)
1992 rate = 18 * 2;
1993 else if (rate > 24 * 2 && snr < 11)
1994 rate = 24 * 2;
1995 else if (rate > 36 * 2 && snr < 15)
1996 rate = 36 * 2;
1997 else if (rate > 48 * 2 && snr < 19)
1998 rate = 48 * 2;
1999 else if (rate > 54 * 2 && snr < 21)
2000 rate = 54 * 2;
2001 est = rate * 500;
2002
2003 if (capab == CAPAB_HT || capab == CAPAB_HT40 || capab == CAPAB_VHT) {
2004 ie = wpa_scan_get_ie(res, WLAN_EID_HT_CAP);
2005 if (ie) {
2006 tmp = max_ht20_rate(snr);
2007 if (tmp > est)
2008 est = tmp;
2009 }
2010 }
2011
2012 if (capab == CAPAB_HT40 || capab == CAPAB_VHT) {
2013 ie = wpa_scan_get_ie(res, WLAN_EID_HT_OPERATION);
2014 if (ie && ie[1] >= 2 &&
2015 (ie[3] & HT_INFO_HT_PARAM_SECONDARY_CHNL_OFF_MASK)) {
2016 tmp = max_ht40_rate(snr);
2017 if (tmp > est)
2018 est = tmp;
2019 }
2020 }
2021
2022 if (capab == CAPAB_VHT) {
2023 /* Use +1 to assume VHT is always faster than HT */
2024 ie = wpa_scan_get_ie(res, WLAN_EID_VHT_CAP);
2025 if (ie) {
2026 tmp = max_ht20_rate(snr) + 1;
2027 if (tmp > est)
2028 est = tmp;
2029
2030 ie = wpa_scan_get_ie(res, WLAN_EID_HT_OPERATION);
2031 if (ie && ie[1] >= 2 &&
2032 (ie[3] &
2033 HT_INFO_HT_PARAM_SECONDARY_CHNL_OFF_MASK)) {
2034 tmp = max_ht40_rate(snr) + 1;
2035 if (tmp > est)
2036 est = tmp;
2037 }
2038
2039 ie = wpa_scan_get_ie(res, WLAN_EID_VHT_OPERATION);
2040 if (ie && ie[1] >= 1 &&
2041 (ie[2] & VHT_OPMODE_CHANNEL_WIDTH_MASK)) {
2042 tmp = max_vht80_rate(snr) + 1;
2043 if (tmp > est)
2044 est = tmp;
2045 }
2046 }
2047 }
2048
2049 /* TODO: channel utilization and AP load (e.g., from AP Beacon) */
2050
2051 res->est_throughput = est;
2052 }
2053
2054
2055 /**
2056 * wpa_supplicant_get_scan_results - Get scan results
2057 * @wpa_s: Pointer to wpa_supplicant data
2058 * @info: Information about what was scanned or %NULL if not available
2059 * @new_scan: Whether a new scan was performed
2060 * Returns: Scan results, %NULL on failure
2061 *
2062 * This function request the current scan results from the driver and updates
2063 * the local BSS list wpa_s->bss. The caller is responsible for freeing the
2064 * results with wpa_scan_results_free().
2065 */
2066 struct wpa_scan_results *
2067 wpa_supplicant_get_scan_results(struct wpa_supplicant *wpa_s,
2068 struct scan_info *info, int new_scan)
2069 {
2070 struct wpa_scan_results *scan_res;
2071 size_t i;
2072 int (*compar)(const void *, const void *) = wpa_scan_result_compar;
2073
2074 scan_res = wpa_drv_get_scan_results2(wpa_s);
2075 if (scan_res == NULL) {
2076 wpa_dbg(wpa_s, MSG_DEBUG, "Failed to get scan results");
2077 return NULL;
2078 }
2079 if (scan_res->fetch_time.sec == 0) {
2080 /*
2081 * Make sure we have a valid timestamp if the driver wrapper
2082 * does not set this.
2083 */
2084 os_get_reltime(&scan_res->fetch_time);
2085 }
2086 filter_scan_res(wpa_s, scan_res);
2087
2088 for (i = 0; i < scan_res->num; i++) {
2089 struct wpa_scan_res *scan_res_item = scan_res->res[i];
2090
2091 scan_snr(scan_res_item);
2092 scan_est_throughput(wpa_s, scan_res_item);
2093 }
2094
2095 #ifdef CONFIG_WPS
2096 if (wpas_wps_searching(wpa_s)) {
2097 wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Order scan results with WPS "
2098 "provisioning rules");
2099 compar = wpa_scan_result_wps_compar;
2100 }
2101 #endif /* CONFIG_WPS */
2102
2103 qsort(scan_res->res, scan_res->num, sizeof(struct wpa_scan_res *),
2104 compar);
2105 dump_scan_res(scan_res);
2106
2107 wpa_bss_update_start(wpa_s);
2108 for (i = 0; i < scan_res->num; i++)
2109 wpa_bss_update_scan_res(wpa_s, scan_res->res[i],
2110 &scan_res->fetch_time);
2111 wpa_bss_update_end(wpa_s, info, new_scan);
2112
2113 return scan_res;
2114 }
2115
2116
2117 /**
2118 * wpa_supplicant_update_scan_results - Update scan results from the driver
2119 * @wpa_s: Pointer to wpa_supplicant data
2120 * Returns: 0 on success, -1 on failure
2121 *
2122 * This function updates the BSS table within wpa_supplicant based on the
2123 * currently available scan results from the driver without requesting a new
2124 * scan. This is used in cases where the driver indicates an association
2125 * (including roaming within ESS) and wpa_supplicant does not yet have the
2126 * needed information to complete the connection (e.g., to perform validation
2127 * steps in 4-way handshake).
2128 */
2129 int wpa_supplicant_update_scan_results(struct wpa_supplicant *wpa_s)
2130 {
2131 struct wpa_scan_results *scan_res;
2132 scan_res = wpa_supplicant_get_scan_results(wpa_s, NULL, 0);
2133 if (scan_res == NULL)
2134 return -1;
2135 wpa_scan_results_free(scan_res);
2136
2137 return 0;
2138 }
2139
2140
2141 /**
2142 * scan_only_handler - Reports scan results
2143 */
2144 void scan_only_handler(struct wpa_supplicant *wpa_s,
2145 struct wpa_scan_results *scan_res)
2146 {
2147 wpa_dbg(wpa_s, MSG_DEBUG, "Scan-only results received");
2148 if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
2149 wpa_s->manual_scan_use_id && wpa_s->own_scan_running) {
2150 wpa_msg_ctrl(wpa_s, MSG_INFO, WPA_EVENT_SCAN_RESULTS "id=%u",
2151 wpa_s->manual_scan_id);
2152 wpa_s->manual_scan_use_id = 0;
2153 } else {
2154 wpa_msg_ctrl(wpa_s, MSG_INFO, WPA_EVENT_SCAN_RESULTS);
2155 }
2156 wpas_notify_scan_results(wpa_s);
2157 wpas_notify_scan_done(wpa_s, 1);
2158 if (wpa_s->scan_work) {
2159 struct wpa_radio_work *work = wpa_s->scan_work;
2160 wpa_s->scan_work = NULL;
2161 radio_work_done(work);
2162 }
2163
2164 if (wpa_s->wpa_state == WPA_SCANNING)
2165 wpa_supplicant_set_state(wpa_s, wpa_s->scan_prev_wpa_state);
2166 }
2167
2168
2169 int wpas_scan_scheduled(struct wpa_supplicant *wpa_s)
2170 {
2171 return eloop_is_timeout_registered(wpa_supplicant_scan, wpa_s, NULL);
2172 }
2173
2174
2175 struct wpa_driver_scan_params *
2176 wpa_scan_clone_params(const struct wpa_driver_scan_params *src)
2177 {
2178 struct wpa_driver_scan_params *params;
2179 size_t i;
2180 u8 *n;
2181
2182 params = os_zalloc(sizeof(*params));
2183 if (params == NULL)
2184 return NULL;
2185
2186 for (i = 0; i < src->num_ssids; i++) {
2187 if (src->ssids[i].ssid) {
2188 n = os_malloc(src->ssids[i].ssid_len);
2189 if (n == NULL)
2190 goto failed;
2191 os_memcpy(n, src->ssids[i].ssid,
2192 src->ssids[i].ssid_len);
2193 params->ssids[i].ssid = n;
2194 params->ssids[i].ssid_len = src->ssids[i].ssid_len;
2195 }
2196 }
2197 params->num_ssids = src->num_ssids;
2198
2199 if (src->extra_ies) {
2200 n = os_malloc(src->extra_ies_len);
2201 if (n == NULL)
2202 goto failed;
2203 os_memcpy(n, src->extra_ies, src->extra_ies_len);
2204 params->extra_ies = n;
2205 params->extra_ies_len = src->extra_ies_len;
2206 }
2207
2208 if (src->freqs) {
2209 int len = int_array_len(src->freqs);
2210 params->freqs = os_malloc((len + 1) * sizeof(int));
2211 if (params->freqs == NULL)
2212 goto failed;
2213 os_memcpy(params->freqs, src->freqs, (len + 1) * sizeof(int));
2214 }
2215
2216 if (src->filter_ssids) {
2217 params->filter_ssids = os_malloc(sizeof(*params->filter_ssids) *
2218 src->num_filter_ssids);
2219 if (params->filter_ssids == NULL)
2220 goto failed;
2221 os_memcpy(params->filter_ssids, src->filter_ssids,
2222 sizeof(*params->filter_ssids) *
2223 src->num_filter_ssids);
2224 params->num_filter_ssids = src->num_filter_ssids;
2225 }
2226
2227 params->filter_rssi = src->filter_rssi;
2228 params->p2p_probe = src->p2p_probe;
2229 params->only_new_results = src->only_new_results;
2230 params->low_priority = src->low_priority;
2231
2232 if (src->sched_scan_plans_num > 0) {
2233 params->sched_scan_plans =
2234 os_malloc(sizeof(*src->sched_scan_plans) *
2235 src->sched_scan_plans_num);
2236 if (!params->sched_scan_plans)
2237 goto failed;
2238
2239 os_memcpy(params->sched_scan_plans, src->sched_scan_plans,
2240 sizeof(*src->sched_scan_plans) *
2241 src->sched_scan_plans_num);
2242 params->sched_scan_plans_num = src->sched_scan_plans_num;
2243 }
2244
2245 if (src->mac_addr_rand) {
2246 params->mac_addr_rand = src->mac_addr_rand;
2247
2248 if (src->mac_addr && src->mac_addr_mask) {
2249 u8 *mac_addr;
2250
2251 mac_addr = os_malloc(2 * ETH_ALEN);
2252 if (!mac_addr)
2253 goto failed;
2254
2255 os_memcpy(mac_addr, src->mac_addr, ETH_ALEN);
2256 os_memcpy(mac_addr + ETH_ALEN, src->mac_addr_mask,
2257 ETH_ALEN);
2258 params->mac_addr = mac_addr;
2259 params->mac_addr_mask = mac_addr + ETH_ALEN;
2260 }
2261 }
2262
2263 if (src->bssid) {
2264 u8 *bssid;
2265
2266 bssid = os_malloc(ETH_ALEN);
2267 if (!bssid)
2268 goto failed;
2269 os_memcpy(bssid, src->bssid, ETH_ALEN);
2270 params->bssid = bssid;
2271 }
2272
2273 return params;
2274
2275 failed:
2276 wpa_scan_free_params(params);
2277 return NULL;
2278 }
2279
2280
2281 void wpa_scan_free_params(struct wpa_driver_scan_params *params)
2282 {
2283 size_t i;
2284
2285 if (params == NULL)
2286 return;
2287
2288 for (i = 0; i < params->num_ssids; i++)
2289 os_free((u8 *) params->ssids[i].ssid);
2290 os_free((u8 *) params->extra_ies);
2291 os_free(params->freqs);
2292 os_free(params->filter_ssids);
2293 os_free(params->sched_scan_plans);
2294
2295 /*
2296 * Note: params->mac_addr_mask points to same memory allocation and
2297 * must not be freed separately.
2298 */
2299 os_free((u8 *) params->mac_addr);
2300
2301 os_free((u8 *) params->bssid);
2302
2303 os_free(params);
2304 }
2305
2306
2307 int wpas_start_pno(struct wpa_supplicant *wpa_s)
2308 {
2309 int ret, prio;
2310 size_t i, num_ssid, num_match_ssid;
2311 struct wpa_ssid *ssid;
2312 struct wpa_driver_scan_params params;
2313 struct sched_scan_plan scan_plan;
2314
2315 if (!wpa_s->sched_scan_supported)
2316 return -1;
2317
2318 if (wpa_s->pno || wpa_s->pno_sched_pending)
2319 return 0;
2320
2321 if ((wpa_s->wpa_state > WPA_SCANNING) &&
2322 (wpa_s->wpa_state <= WPA_COMPLETED)) {
2323 wpa_printf(MSG_ERROR, "PNO: In assoc process");
2324 return -EAGAIN;
2325 }
2326
2327 if (wpa_s->wpa_state == WPA_SCANNING) {
2328 wpa_supplicant_cancel_scan(wpa_s);
2329 if (wpa_s->sched_scanning) {
2330 wpa_printf(MSG_DEBUG, "Schedule PNO on completion of "
2331 "ongoing sched scan");
2332 wpa_supplicant_cancel_sched_scan(wpa_s);
2333 wpa_s->pno_sched_pending = 1;
2334 return 0;
2335 }
2336 }
2337
2338 os_memset(&params, 0, sizeof(params));
2339
2340 num_ssid = num_match_ssid = 0;
2341 ssid = wpa_s->conf->ssid;
2342 while (ssid) {
2343 if (!wpas_network_disabled(wpa_s, ssid)) {
2344 num_match_ssid++;
2345 if (ssid->scan_ssid)
2346 num_ssid++;
2347 }
2348 ssid = ssid->next;
2349 }
2350
2351 if (num_match_ssid == 0) {
2352 wpa_printf(MSG_DEBUG, "PNO: No configured SSIDs");
2353 return -1;
2354 }
2355
2356 if (num_match_ssid > num_ssid) {
2357 params.num_ssids++; /* wildcard */
2358 num_ssid++;
2359 }
2360
2361 if (num_ssid > WPAS_MAX_SCAN_SSIDS) {
2362 wpa_printf(MSG_DEBUG, "PNO: Use only the first %u SSIDs from "
2363 "%u", WPAS_MAX_SCAN_SSIDS, (unsigned int) num_ssid);
2364 num_ssid = WPAS_MAX_SCAN_SSIDS;
2365 }
2366
2367 if (num_match_ssid > wpa_s->max_match_sets) {
2368 num_match_ssid = wpa_s->max_match_sets;
2369 wpa_dbg(wpa_s, MSG_DEBUG, "PNO: Too many SSIDs to match");
2370 }
2371 params.filter_ssids = os_calloc(num_match_ssid,
2372 sizeof(struct wpa_driver_scan_filter));
2373 if (params.filter_ssids == NULL)
2374 return -1;
2375
2376 i = 0;
2377 prio = 0;
2378 ssid = wpa_s->conf->pssid[prio];
2379 while (ssid) {
2380 if (!wpas_network_disabled(wpa_s, ssid)) {
2381 if (ssid->scan_ssid && params.num_ssids < num_ssid) {
2382 params.ssids[params.num_ssids].ssid =
2383 ssid->ssid;
2384 params.ssids[params.num_ssids].ssid_len =
2385 ssid->ssid_len;
2386 params.num_ssids++;
2387 }
2388 os_memcpy(params.filter_ssids[i].ssid, ssid->ssid,
2389 ssid->ssid_len);
2390 params.filter_ssids[i].ssid_len = ssid->ssid_len;
2391 params.num_filter_ssids++;
2392 i++;
2393 if (i == num_match_ssid)
2394 break;
2395 }
2396 if (ssid->pnext)
2397 ssid = ssid->pnext;
2398 else if (prio + 1 == wpa_s->conf->num_prio)
2399 break;
2400 else
2401 ssid = wpa_s->conf->pssid[++prio];
2402 }
2403
2404 if (wpa_s->conf->filter_rssi)
2405 params.filter_rssi = wpa_s->conf->filter_rssi;
2406
2407 if (wpa_s->sched_scan_plans_num) {
2408 params.sched_scan_plans = wpa_s->sched_scan_plans;
2409 params.sched_scan_plans_num = wpa_s->sched_scan_plans_num;
2410 } else {
2411 /* Set one scan plan that will run infinitely */
2412 if (wpa_s->conf->sched_scan_interval)
2413 scan_plan.interval = wpa_s->conf->sched_scan_interval;
2414 else
2415 scan_plan.interval = 10;
2416
2417 scan_plan.iterations = 0;
2418 params.sched_scan_plans = &scan_plan;
2419 params.sched_scan_plans_num = 1;
2420 }
2421
2422 if (params.freqs == NULL && wpa_s->manual_sched_scan_freqs) {
2423 wpa_dbg(wpa_s, MSG_DEBUG, "Limit sched scan to specified channels");
2424 params.freqs = wpa_s->manual_sched_scan_freqs;
2425 }
2426
2427 if (wpa_s->mac_addr_rand_enable & MAC_ADDR_RAND_PNO) {
2428 params.mac_addr_rand = 1;
2429 if (wpa_s->mac_addr_pno) {
2430 params.mac_addr = wpa_s->mac_addr_pno;
2431 params.mac_addr_mask = wpa_s->mac_addr_pno + ETH_ALEN;
2432 }
2433 }
2434
2435 ret = wpa_supplicant_start_sched_scan(wpa_s, &params);
2436 os_free(params.filter_ssids);
2437 if (ret == 0)
2438 wpa_s->pno = 1;
2439 else
2440 wpa_msg(wpa_s, MSG_ERROR, "Failed to schedule PNO");
2441 return ret;
2442 }
2443
2444
2445 int wpas_stop_pno(struct wpa_supplicant *wpa_s)
2446 {
2447 int ret = 0;
2448
2449 if (!wpa_s->pno)
2450 return 0;
2451
2452 ret = wpa_supplicant_stop_sched_scan(wpa_s);
2453
2454 wpa_s->pno = 0;
2455 wpa_s->pno_sched_pending = 0;
2456
2457 if (wpa_s->wpa_state == WPA_SCANNING)
2458 wpa_supplicant_req_scan(wpa_s, 0, 0);
2459
2460 return ret;
2461 }
2462
2463
2464 void wpas_mac_addr_rand_scan_clear(struct wpa_supplicant *wpa_s,
2465 unsigned int type)
2466 {
2467 type &= MAC_ADDR_RAND_ALL;
2468 wpa_s->mac_addr_rand_enable &= ~type;
2469
2470 if (type & MAC_ADDR_RAND_SCAN) {
2471 os_free(wpa_s->mac_addr_scan);
2472 wpa_s->mac_addr_scan = NULL;
2473 }
2474
2475 if (type & MAC_ADDR_RAND_SCHED_SCAN) {
2476 os_free(wpa_s->mac_addr_sched_scan);
2477 wpa_s->mac_addr_sched_scan = NULL;
2478 }
2479
2480 if (type & MAC_ADDR_RAND_PNO) {
2481 os_free(wpa_s->mac_addr_pno);
2482 wpa_s->mac_addr_pno = NULL;
2483 }
2484 }
2485
2486
2487 int wpas_mac_addr_rand_scan_set(struct wpa_supplicant *wpa_s,
2488 unsigned int type, const u8 *addr,
2489 const u8 *mask)
2490 {
2491 u8 *tmp = NULL;
2492
2493 wpas_mac_addr_rand_scan_clear(wpa_s, type);
2494
2495 if (addr) {
2496 tmp = os_malloc(2 * ETH_ALEN);
2497 if (!tmp)
2498 return -1;
2499 os_memcpy(tmp, addr, ETH_ALEN);
2500 os_memcpy(tmp + ETH_ALEN, mask, ETH_ALEN);
2501 }
2502
2503 if (type == MAC_ADDR_RAND_SCAN) {
2504 wpa_s->mac_addr_scan = tmp;
2505 } else if (type == MAC_ADDR_RAND_SCHED_SCAN) {
2506 wpa_s->mac_addr_sched_scan = tmp;
2507 } else if (type == MAC_ADDR_RAND_PNO) {
2508 wpa_s->mac_addr_pno = tmp;
2509 } else {
2510 wpa_printf(MSG_INFO,
2511 "scan: Invalid MAC randomization type=0x%x",
2512 type);
2513 os_free(tmp);
2514 return -1;
2515 }
2516
2517 wpa_s->mac_addr_rand_enable |= type;
2518 return 0;
2519 }
2520
2521
2522 int wpas_abort_ongoing_scan(struct wpa_supplicant *wpa_s)
2523 {
2524 if (wpa_s->scan_work && wpa_s->own_scan_running) {
2525 wpa_dbg(wpa_s, MSG_DEBUG, "Abort an ongoing scan");
2526 return wpa_drv_abort_scan(wpa_s);
2527 }
2528
2529 return 0;
2530 }
2531
2532
2533 int wpas_sched_scan_plans_set(struct wpa_supplicant *wpa_s, const char *cmd)
2534 {
2535 struct sched_scan_plan *scan_plans = NULL;
2536 const char *token, *context = NULL;
2537 unsigned int num = 0;
2538
2539 if (!cmd)
2540 return -1;
2541
2542 if (!cmd[0]) {
2543 wpa_printf(MSG_DEBUG, "Clear sched scan plans");
2544 os_free(wpa_s->sched_scan_plans);
2545 wpa_s->sched_scan_plans = NULL;
2546 wpa_s->sched_scan_plans_num = 0;
2547 return 0;
2548 }
2549
2550 while ((token = cstr_token(cmd, " ", &context))) {
2551 int ret;
2552 struct sched_scan_plan *scan_plan, *n;
2553
2554 n = os_realloc_array(scan_plans, num + 1, sizeof(*scan_plans));
2555 if (!n)
2556 goto fail;
2557
2558 scan_plans = n;
2559 scan_plan = &scan_plans[num];
2560 num++;
2561
2562 ret = sscanf(token, "%u:%u", &scan_plan->interval,
2563 &scan_plan->iterations);
2564 if (ret <= 0 || ret > 2 || !scan_plan->interval) {
2565 wpa_printf(MSG_ERROR,
2566 "Invalid sched scan plan input: %s", token);
2567 goto fail;
2568 }
2569
2570 if (!scan_plan->interval) {
2571 wpa_printf(MSG_ERROR,
2572 "scan plan %u: Interval cannot be zero",
2573 num);
2574 goto fail;
2575 }
2576
2577 if (scan_plan->interval > wpa_s->max_sched_scan_plan_interval) {
2578 wpa_printf(MSG_WARNING,
2579 "scan plan %u: Scan interval too long(%u), use the maximum allowed(%u)",
2580 num, scan_plan->interval,
2581 wpa_s->max_sched_scan_plan_interval);
2582 scan_plan->interval =
2583 wpa_s->max_sched_scan_plan_interval;
2584 }
2585
2586 if (ret == 1) {
2587 scan_plan->iterations = 0;
2588 break;
2589 }
2590
2591 if (!scan_plan->iterations) {
2592 wpa_printf(MSG_ERROR,
2593 "scan plan %u: Number of iterations cannot be zero",
2594 num);
2595 goto fail;
2596 }
2597
2598 if (scan_plan->iterations >
2599 wpa_s->max_sched_scan_plan_iterations) {
2600 wpa_printf(MSG_WARNING,
2601 "scan plan %u: Too many iterations(%u), use the maximum allowed(%u)",
2602 num, scan_plan->iterations,
2603 wpa_s->max_sched_scan_plan_iterations);
2604 scan_plan->iterations =
2605 wpa_s->max_sched_scan_plan_iterations;
2606 }
2607
2608 wpa_printf(MSG_DEBUG,
2609 "scan plan %u: interval=%u iterations=%u",
2610 num, scan_plan->interval, scan_plan->iterations);
2611 }
2612
2613 if (!scan_plans) {
2614 wpa_printf(MSG_ERROR, "Invalid scan plans entry");
2615 goto fail;
2616 }
2617
2618 if (cstr_token(cmd, " ", &context) || scan_plans[num - 1].iterations) {
2619 wpa_printf(MSG_ERROR,
2620 "All scan plans but the last must specify a number of iterations");
2621 goto fail;
2622 }
2623
2624 wpa_printf(MSG_DEBUG, "scan plan %u (last plan): interval=%u",
2625 num, scan_plans[num - 1].interval);
2626
2627 if (num > wpa_s->max_sched_scan_plans) {
2628 wpa_printf(MSG_WARNING,
2629 "Too many scheduled scan plans (only %u supported)",
2630 wpa_s->max_sched_scan_plans);
2631 wpa_printf(MSG_WARNING,
2632 "Use only the first %u scan plans, and the last one (in infinite loop)",
2633 wpa_s->max_sched_scan_plans - 1);
2634 os_memcpy(&scan_plans[wpa_s->max_sched_scan_plans - 1],
2635 &scan_plans[num - 1], sizeof(*scan_plans));
2636 num = wpa_s->max_sched_scan_plans;
2637 }
2638
2639 os_free(wpa_s->sched_scan_plans);
2640 wpa_s->sched_scan_plans = scan_plans;
2641 wpa_s->sched_scan_plans_num = num;
2642
2643 return 0;
2644
2645 fail:
2646 os_free(scan_plans);
2647 wpa_printf(MSG_ERROR, "invalid scan plans list");
2648 return -1;
2649 }
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