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Add support for configuring scheduled scan plans
[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 return extra_ie;
494 }
495
496
497 #ifdef CONFIG_P2P
498
499 /*
500 * Check whether there are any enabled networks or credentials that could be
501 * used for a non-P2P connection.
502 */
503 static int non_p2p_network_enabled(struct wpa_supplicant *wpa_s)
504 {
505 struct wpa_ssid *ssid;
506
507 for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
508 if (wpas_network_disabled(wpa_s, ssid))
509 continue;
510 if (!ssid->p2p_group)
511 return 1;
512 }
513
514 if (wpa_s->conf->cred && wpa_s->conf->interworking &&
515 wpa_s->conf->auto_interworking)
516 return 1;
517
518 return 0;
519 }
520
521 #endif /* CONFIG_P2P */
522
523
524 static struct hostapd_hw_modes * get_mode(struct hostapd_hw_modes *modes,
525 u16 num_modes,
526 enum hostapd_hw_mode mode)
527 {
528 u16 i;
529
530 for (i = 0; i < num_modes; i++) {
531 if (modes[i].mode == mode)
532 return &modes[i];
533 }
534
535 return NULL;
536 }
537
538
539 static void wpa_setband_scan_freqs_list(struct wpa_supplicant *wpa_s,
540 enum hostapd_hw_mode band,
541 struct wpa_driver_scan_params *params)
542 {
543 /* Include only supported channels for the specified band */
544 struct hostapd_hw_modes *mode;
545 int count, i;
546
547 mode = get_mode(wpa_s->hw.modes, wpa_s->hw.num_modes, band);
548 if (mode == NULL) {
549 /* No channels supported in this band - use empty list */
550 params->freqs = os_zalloc(sizeof(int));
551 return;
552 }
553
554 params->freqs = os_calloc(mode->num_channels + 1, sizeof(int));
555 if (params->freqs == NULL)
556 return;
557 for (count = 0, i = 0; i < mode->num_channels; i++) {
558 if (mode->channels[i].flag & HOSTAPD_CHAN_DISABLED)
559 continue;
560 params->freqs[count++] = mode->channels[i].freq;
561 }
562 }
563
564
565 static void wpa_setband_scan_freqs(struct wpa_supplicant *wpa_s,
566 struct wpa_driver_scan_params *params)
567 {
568 if (wpa_s->hw.modes == NULL)
569 return; /* unknown what channels the driver supports */
570 if (params->freqs)
571 return; /* already using a limited channel set */
572 if (wpa_s->setband == WPA_SETBAND_5G)
573 wpa_setband_scan_freqs_list(wpa_s, HOSTAPD_MODE_IEEE80211A,
574 params);
575 else if (wpa_s->setband == WPA_SETBAND_2G)
576 wpa_setband_scan_freqs_list(wpa_s, HOSTAPD_MODE_IEEE80211G,
577 params);
578 }
579
580
581 static void wpa_set_scan_ssids(struct wpa_supplicant *wpa_s,
582 struct wpa_driver_scan_params *params,
583 size_t max_ssids)
584 {
585 unsigned int i;
586 struct wpa_ssid *ssid;
587
588 for (i = 0; i < wpa_s->scan_id_count; i++) {
589 unsigned int j;
590
591 ssid = wpa_config_get_network(wpa_s->conf, wpa_s->scan_id[i]);
592 if (!ssid || !ssid->scan_ssid)
593 continue;
594
595 for (j = 0; j < params->num_ssids; j++) {
596 if (params->ssids[j].ssid_len == ssid->ssid_len &&
597 params->ssids[j].ssid &&
598 os_memcmp(params->ssids[j].ssid, ssid->ssid,
599 ssid->ssid_len) == 0)
600 break;
601 }
602 if (j < params->num_ssids)
603 continue; /* already in the list */
604
605 if (params->num_ssids + 1 > max_ssids) {
606 wpa_printf(MSG_DEBUG,
607 "Over max scan SSIDs for manual request");
608 break;
609 }
610
611 wpa_printf(MSG_DEBUG, "Scan SSID (manual request): %s",
612 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
613 params->ssids[params->num_ssids].ssid = ssid->ssid;
614 params->ssids[params->num_ssids].ssid_len = ssid->ssid_len;
615 params->num_ssids++;
616 }
617
618 wpa_s->scan_id_count = 0;
619 }
620
621
622 static int wpa_set_ssids_from_scan_req(struct wpa_supplicant *wpa_s,
623 struct wpa_driver_scan_params *params,
624 size_t max_ssids)
625 {
626 unsigned int i;
627
628 if (wpa_s->ssids_from_scan_req == NULL ||
629 wpa_s->num_ssids_from_scan_req == 0)
630 return 0;
631
632 if (wpa_s->num_ssids_from_scan_req > max_ssids) {
633 wpa_s->num_ssids_from_scan_req = max_ssids;
634 wpa_printf(MSG_DEBUG, "Over max scan SSIDs from scan req: %u",
635 (unsigned int) max_ssids);
636 }
637
638 for (i = 0; i < wpa_s->num_ssids_from_scan_req; i++) {
639 params->ssids[i].ssid = wpa_s->ssids_from_scan_req[i].ssid;
640 params->ssids[i].ssid_len =
641 wpa_s->ssids_from_scan_req[i].ssid_len;
642 wpa_hexdump_ascii(MSG_DEBUG, "specific SSID",
643 params->ssids[i].ssid,
644 params->ssids[i].ssid_len);
645 }
646
647 params->num_ssids = wpa_s->num_ssids_from_scan_req;
648 wpa_s->num_ssids_from_scan_req = 0;
649 return 1;
650 }
651
652
653 static void wpa_supplicant_scan(void *eloop_ctx, void *timeout_ctx)
654 {
655 struct wpa_supplicant *wpa_s = eloop_ctx;
656 struct wpa_ssid *ssid;
657 int ret, p2p_in_prog;
658 struct wpabuf *extra_ie = NULL;
659 struct wpa_driver_scan_params params;
660 struct wpa_driver_scan_params *scan_params;
661 size_t max_ssids;
662 int connect_without_scan = 0;
663
664 if (wpa_s->pno || wpa_s->pno_sched_pending) {
665 wpa_dbg(wpa_s, MSG_DEBUG, "Skip scan - PNO is in progress");
666 return;
667 }
668
669 if (wpa_s->wpa_state == WPA_INTERFACE_DISABLED) {
670 wpa_dbg(wpa_s, MSG_DEBUG, "Skip scan - interface disabled");
671 return;
672 }
673
674 if (wpa_s->disconnected && wpa_s->scan_req == NORMAL_SCAN_REQ) {
675 wpa_dbg(wpa_s, MSG_DEBUG, "Disconnected - do not scan");
676 wpa_supplicant_set_state(wpa_s, WPA_DISCONNECTED);
677 return;
678 }
679
680 if (wpa_s->scanning) {
681 /*
682 * If we are already in scanning state, we shall reschedule the
683 * the incoming scan request.
684 */
685 wpa_dbg(wpa_s, MSG_DEBUG, "Already scanning - Reschedule the incoming scan req");
686 wpa_supplicant_req_scan(wpa_s, 1, 0);
687 return;
688 }
689
690 if (!wpa_supplicant_enabled_networks(wpa_s) &&
691 wpa_s->scan_req == NORMAL_SCAN_REQ) {
692 wpa_dbg(wpa_s, MSG_DEBUG, "No enabled networks - do not scan");
693 wpa_supplicant_set_state(wpa_s, WPA_INACTIVE);
694 return;
695 }
696
697 if (wpa_s->conf->ap_scan != 0 &&
698 (wpa_s->drv_flags & WPA_DRIVER_FLAGS_WIRED)) {
699 wpa_dbg(wpa_s, MSG_DEBUG, "Using wired authentication - "
700 "overriding ap_scan configuration");
701 wpa_s->conf->ap_scan = 0;
702 wpas_notify_ap_scan_changed(wpa_s);
703 }
704
705 if (wpa_s->conf->ap_scan == 0) {
706 wpa_supplicant_gen_assoc_event(wpa_s);
707 return;
708 }
709
710 ssid = NULL;
711 if (wpa_s->scan_req != MANUAL_SCAN_REQ &&
712 wpa_s->connect_without_scan) {
713 connect_without_scan = 1;
714 for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
715 if (ssid == wpa_s->connect_without_scan)
716 break;
717 }
718 }
719
720 p2p_in_prog = wpas_p2p_in_progress(wpa_s);
721 if (p2p_in_prog && p2p_in_prog != 2 &&
722 (!ssid ||
723 (ssid->mode != WPAS_MODE_AP && ssid->mode != WPAS_MODE_P2P_GO))) {
724 wpa_dbg(wpa_s, MSG_DEBUG, "Delay station mode scan while P2P operation is in progress");
725 wpa_supplicant_req_scan(wpa_s, 5, 0);
726 return;
727 }
728
729 if (wpa_s->conf->ap_scan == 2)
730 max_ssids = 1;
731 else {
732 max_ssids = wpa_s->max_scan_ssids;
733 if (max_ssids > WPAS_MAX_SCAN_SSIDS)
734 max_ssids = WPAS_MAX_SCAN_SSIDS;
735 }
736
737 wpa_s->last_scan_req = wpa_s->scan_req;
738 wpa_s->scan_req = NORMAL_SCAN_REQ;
739
740 if (connect_without_scan) {
741 wpa_s->connect_without_scan = NULL;
742 if (ssid) {
743 wpa_printf(MSG_DEBUG, "Start a pre-selected network "
744 "without scan step");
745 wpa_supplicant_associate(wpa_s, NULL, ssid);
746 return;
747 }
748 }
749
750 os_memset(&params, 0, sizeof(params));
751
752 wpa_s->scan_prev_wpa_state = wpa_s->wpa_state;
753 if (wpa_s->wpa_state == WPA_DISCONNECTED ||
754 wpa_s->wpa_state == WPA_INACTIVE)
755 wpa_supplicant_set_state(wpa_s, WPA_SCANNING);
756
757 /*
758 * If autoscan has set its own scanning parameters
759 */
760 if (wpa_s->autoscan_params != NULL) {
761 scan_params = wpa_s->autoscan_params;
762 goto scan;
763 }
764
765 if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
766 wpa_set_ssids_from_scan_req(wpa_s, &params, max_ssids)) {
767 wpa_printf(MSG_DEBUG, "Use specific SSIDs from SCAN command");
768 goto ssid_list_set;
769 }
770
771 #ifdef CONFIG_P2P
772 if ((wpa_s->p2p_in_provisioning || wpa_s->show_group_started) &&
773 wpa_s->go_params && !wpa_s->conf->passive_scan) {
774 wpa_printf(MSG_DEBUG, "P2P: Use specific SSID for scan during P2P group formation (p2p_in_provisioning=%d show_group_started=%d)",
775 wpa_s->p2p_in_provisioning,
776 wpa_s->show_group_started);
777 params.ssids[0].ssid = wpa_s->go_params->ssid;
778 params.ssids[0].ssid_len = wpa_s->go_params->ssid_len;
779 params.num_ssids = 1;
780 goto ssid_list_set;
781 }
782
783 if (wpa_s->p2p_in_invitation) {
784 if (wpa_s->current_ssid) {
785 wpa_printf(MSG_DEBUG, "P2P: Use specific SSID for scan during invitation");
786 params.ssids[0].ssid = wpa_s->current_ssid->ssid;
787 params.ssids[0].ssid_len =
788 wpa_s->current_ssid->ssid_len;
789 params.num_ssids = 1;
790 } else {
791 wpa_printf(MSG_DEBUG, "P2P: No specific SSID known for scan during invitation");
792 }
793 goto ssid_list_set;
794 }
795 #endif /* CONFIG_P2P */
796
797 /* Find the starting point from which to continue scanning */
798 ssid = wpa_s->conf->ssid;
799 if (wpa_s->prev_scan_ssid != WILDCARD_SSID_SCAN) {
800 while (ssid) {
801 if (ssid == wpa_s->prev_scan_ssid) {
802 ssid = ssid->next;
803 break;
804 }
805 ssid = ssid->next;
806 }
807 }
808
809 if (wpa_s->last_scan_req != MANUAL_SCAN_REQ &&
810 #ifdef CONFIG_AP
811 !wpa_s->ap_iface &&
812 #endif /* CONFIG_AP */
813 wpa_s->conf->ap_scan == 2) {
814 wpa_s->connect_without_scan = NULL;
815 wpa_s->prev_scan_wildcard = 0;
816 wpa_supplicant_assoc_try(wpa_s, ssid);
817 return;
818 } else if (wpa_s->conf->ap_scan == 2) {
819 /*
820 * User-initiated scan request in ap_scan == 2; scan with
821 * wildcard SSID.
822 */
823 ssid = NULL;
824 } else if (wpa_s->reattach && wpa_s->current_ssid != NULL) {
825 /*
826 * Perform single-channel single-SSID scan for
827 * reassociate-to-same-BSS operation.
828 */
829 /* Setup SSID */
830 ssid = wpa_s->current_ssid;
831 wpa_hexdump_ascii(MSG_DEBUG, "Scan SSID",
832 ssid->ssid, ssid->ssid_len);
833 params.ssids[0].ssid = ssid->ssid;
834 params.ssids[0].ssid_len = ssid->ssid_len;
835 params.num_ssids = 1;
836
837 /*
838 * Allocate memory for frequency array, allocate one extra
839 * slot for the zero-terminator.
840 */
841 params.freqs = os_malloc(sizeof(int) * 2);
842 if (params.freqs == NULL) {
843 wpa_dbg(wpa_s, MSG_ERROR, "Memory allocation failed");
844 return;
845 }
846 params.freqs[0] = wpa_s->assoc_freq;
847 params.freqs[1] = 0;
848
849 /*
850 * Reset the reattach flag so that we fall back to full scan if
851 * this scan fails.
852 */
853 wpa_s->reattach = 0;
854 } else {
855 struct wpa_ssid *start = ssid, *tssid;
856 int freqs_set = 0;
857 if (ssid == NULL && max_ssids > 1)
858 ssid = wpa_s->conf->ssid;
859 while (ssid) {
860 if (!wpas_network_disabled(wpa_s, ssid) &&
861 ssid->scan_ssid) {
862 wpa_hexdump_ascii(MSG_DEBUG, "Scan SSID",
863 ssid->ssid, ssid->ssid_len);
864 params.ssids[params.num_ssids].ssid =
865 ssid->ssid;
866 params.ssids[params.num_ssids].ssid_len =
867 ssid->ssid_len;
868 params.num_ssids++;
869 if (params.num_ssids + 1 >= max_ssids)
870 break;
871 }
872 ssid = ssid->next;
873 if (ssid == start)
874 break;
875 if (ssid == NULL && max_ssids > 1 &&
876 start != wpa_s->conf->ssid)
877 ssid = wpa_s->conf->ssid;
878 }
879
880 if (wpa_s->scan_id_count &&
881 wpa_s->last_scan_req == MANUAL_SCAN_REQ)
882 wpa_set_scan_ssids(wpa_s, &params, max_ssids);
883
884 for (tssid = wpa_s->conf->ssid;
885 wpa_s->last_scan_req != MANUAL_SCAN_REQ && tssid;
886 tssid = tssid->next) {
887 if (wpas_network_disabled(wpa_s, tssid))
888 continue;
889 if ((params.freqs || !freqs_set) && tssid->scan_freq) {
890 int_array_concat(&params.freqs,
891 tssid->scan_freq);
892 } else {
893 os_free(params.freqs);
894 params.freqs = NULL;
895 }
896 freqs_set = 1;
897 }
898 int_array_sort_unique(params.freqs);
899 }
900
901 if (ssid && max_ssids == 1) {
902 /*
903 * If the driver is limited to 1 SSID at a time interleave
904 * wildcard SSID scans with specific SSID scans to avoid
905 * waiting a long time for a wildcard scan.
906 */
907 if (!wpa_s->prev_scan_wildcard) {
908 params.ssids[0].ssid = NULL;
909 params.ssids[0].ssid_len = 0;
910 wpa_s->prev_scan_wildcard = 1;
911 wpa_dbg(wpa_s, MSG_DEBUG, "Starting AP scan for "
912 "wildcard SSID (Interleave with specific)");
913 } else {
914 wpa_s->prev_scan_ssid = ssid;
915 wpa_s->prev_scan_wildcard = 0;
916 wpa_dbg(wpa_s, MSG_DEBUG,
917 "Starting AP scan for specific SSID: %s",
918 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
919 }
920 } else if (ssid) {
921 /* max_ssids > 1 */
922
923 wpa_s->prev_scan_ssid = ssid;
924 wpa_dbg(wpa_s, MSG_DEBUG, "Include wildcard SSID in "
925 "the scan request");
926 params.num_ssids++;
927 } else if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
928 wpa_s->manual_scan_passive && params.num_ssids == 0) {
929 wpa_dbg(wpa_s, MSG_DEBUG, "Use passive scan based on manual request");
930 } else if (wpa_s->conf->passive_scan) {
931 wpa_dbg(wpa_s, MSG_DEBUG,
932 "Use passive scan based on configuration");
933 } else {
934 wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
935 params.num_ssids++;
936 wpa_dbg(wpa_s, MSG_DEBUG, "Starting AP scan for wildcard "
937 "SSID");
938 }
939
940 ssid_list_set:
941 wpa_supplicant_optimize_freqs(wpa_s, &params);
942 extra_ie = wpa_supplicant_extra_ies(wpa_s);
943
944 if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
945 wpa_s->manual_scan_only_new) {
946 wpa_printf(MSG_DEBUG,
947 "Request driver to clear scan cache due to manual only_new=1 scan");
948 params.only_new_results = 1;
949 }
950
951 if (wpa_s->last_scan_req == MANUAL_SCAN_REQ && params.freqs == NULL &&
952 wpa_s->manual_scan_freqs) {
953 wpa_dbg(wpa_s, MSG_DEBUG, "Limit manual scan to specified channels");
954 params.freqs = wpa_s->manual_scan_freqs;
955 wpa_s->manual_scan_freqs = NULL;
956 }
957
958 if (params.freqs == NULL && wpa_s->next_scan_freqs) {
959 wpa_dbg(wpa_s, MSG_DEBUG, "Optimize scan based on previously "
960 "generated frequency list");
961 params.freqs = wpa_s->next_scan_freqs;
962 } else
963 os_free(wpa_s->next_scan_freqs);
964 wpa_s->next_scan_freqs = NULL;
965 wpa_setband_scan_freqs(wpa_s, &params);
966
967 /* See if user specified frequencies. If so, scan only those. */
968 if (wpa_s->conf->freq_list && !params.freqs) {
969 wpa_dbg(wpa_s, MSG_DEBUG,
970 "Optimize scan based on conf->freq_list");
971 int_array_concat(&params.freqs, wpa_s->conf->freq_list);
972 }
973
974 /* Use current associated channel? */
975 if (wpa_s->conf->scan_cur_freq && !params.freqs) {
976 unsigned int num = wpa_s->num_multichan_concurrent;
977
978 params.freqs = os_calloc(num + 1, sizeof(int));
979 if (params.freqs) {
980 num = get_shared_radio_freqs(wpa_s, params.freqs, num);
981 if (num > 0) {
982 wpa_dbg(wpa_s, MSG_DEBUG, "Scan only the "
983 "current operating channels since "
984 "scan_cur_freq is enabled");
985 } else {
986 os_free(params.freqs);
987 params.freqs = NULL;
988 }
989 }
990 }
991
992 params.filter_ssids = wpa_supplicant_build_filter_ssids(
993 wpa_s->conf, &params.num_filter_ssids);
994 if (extra_ie) {
995 params.extra_ies = wpabuf_head(extra_ie);
996 params.extra_ies_len = wpabuf_len(extra_ie);
997 }
998
999 #ifdef CONFIG_P2P
1000 if (wpa_s->p2p_in_provisioning || wpa_s->p2p_in_invitation ||
1001 (wpa_s->show_group_started && wpa_s->go_params)) {
1002 /*
1003 * The interface may not yet be in P2P mode, so we have to
1004 * explicitly request P2P probe to disable CCK rates.
1005 */
1006 params.p2p_probe = 1;
1007 }
1008 #endif /* CONFIG_P2P */
1009
1010 if (wpa_s->mac_addr_rand_enable & MAC_ADDR_RAND_SCAN) {
1011 params.mac_addr_rand = 1;
1012 if (wpa_s->mac_addr_scan) {
1013 params.mac_addr = wpa_s->mac_addr_scan;
1014 params.mac_addr_mask = wpa_s->mac_addr_scan + ETH_ALEN;
1015 }
1016 }
1017
1018 scan_params = &params;
1019
1020 scan:
1021 #ifdef CONFIG_P2P
1022 /*
1023 * If the driver does not support multi-channel concurrency and a
1024 * virtual interface that shares the same radio with the wpa_s interface
1025 * is operating there may not be need to scan other channels apart from
1026 * the current operating channel on the other virtual interface. Filter
1027 * out other channels in case we are trying to find a connection for a
1028 * station interface when we are not configured to prefer station
1029 * connection and a concurrent operation is already in process.
1030 */
1031 if (wpa_s->scan_for_connection &&
1032 wpa_s->last_scan_req == NORMAL_SCAN_REQ &&
1033 !scan_params->freqs && !params.freqs &&
1034 wpas_is_p2p_prioritized(wpa_s) &&
1035 wpa_s->p2p_group_interface == NOT_P2P_GROUP_INTERFACE &&
1036 non_p2p_network_enabled(wpa_s)) {
1037 unsigned int num = wpa_s->num_multichan_concurrent;
1038
1039 params.freqs = os_calloc(num + 1, sizeof(int));
1040 if (params.freqs) {
1041 num = get_shared_radio_freqs(wpa_s, params.freqs, num);
1042 if (num > 0 && num == wpa_s->num_multichan_concurrent) {
1043 wpa_dbg(wpa_s, MSG_DEBUG, "Scan only the current operating channels since all channels are already used");
1044 } else {
1045 os_free(params.freqs);
1046 params.freqs = NULL;
1047 }
1048 }
1049 }
1050 #endif /* CONFIG_P2P */
1051
1052 ret = wpa_supplicant_trigger_scan(wpa_s, scan_params);
1053
1054 if (ret && wpa_s->last_scan_req == MANUAL_SCAN_REQ && params.freqs &&
1055 !wpa_s->manual_scan_freqs) {
1056 /* Restore manual_scan_freqs for the next attempt */
1057 wpa_s->manual_scan_freqs = params.freqs;
1058 params.freqs = NULL;
1059 }
1060
1061 wpabuf_free(extra_ie);
1062 os_free(params.freqs);
1063 os_free(params.filter_ssids);
1064
1065 if (ret) {
1066 wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate AP scan");
1067 if (wpa_s->scan_prev_wpa_state != wpa_s->wpa_state)
1068 wpa_supplicant_set_state(wpa_s,
1069 wpa_s->scan_prev_wpa_state);
1070 /* Restore scan_req since we will try to scan again */
1071 wpa_s->scan_req = wpa_s->last_scan_req;
1072 wpa_supplicant_req_scan(wpa_s, 1, 0);
1073 } else {
1074 wpa_s->scan_for_connection = 0;
1075 #ifdef CONFIG_INTERWORKING
1076 wpa_s->interworking_fast_assoc_tried = 0;
1077 #endif /* CONFIG_INTERWORKING */
1078 }
1079 }
1080
1081
1082 void wpa_supplicant_update_scan_int(struct wpa_supplicant *wpa_s, int sec)
1083 {
1084 struct os_reltime remaining, new_int;
1085 int cancelled;
1086
1087 cancelled = eloop_cancel_timeout_one(wpa_supplicant_scan, wpa_s, NULL,
1088 &remaining);
1089
1090 new_int.sec = sec;
1091 new_int.usec = 0;
1092 if (cancelled && os_reltime_before(&remaining, &new_int)) {
1093 new_int.sec = remaining.sec;
1094 new_int.usec = remaining.usec;
1095 }
1096
1097 if (cancelled) {
1098 eloop_register_timeout(new_int.sec, new_int.usec,
1099 wpa_supplicant_scan, wpa_s, NULL);
1100 }
1101 wpa_s->scan_interval = sec;
1102 }
1103
1104
1105 /**
1106 * wpa_supplicant_req_scan - Schedule a scan for neighboring access points
1107 * @wpa_s: Pointer to wpa_supplicant data
1108 * @sec: Number of seconds after which to scan
1109 * @usec: Number of microseconds after which to scan
1110 *
1111 * This function is used to schedule a scan for neighboring access points after
1112 * the specified time.
1113 */
1114 void wpa_supplicant_req_scan(struct wpa_supplicant *wpa_s, int sec, int usec)
1115 {
1116 int res;
1117
1118 if (wpa_s->p2p_mgmt) {
1119 wpa_dbg(wpa_s, MSG_DEBUG,
1120 "Ignore scan request (%d.%06d sec) on p2p_mgmt interface",
1121 sec, usec);
1122 return;
1123 }
1124
1125 res = eloop_deplete_timeout(sec, usec, wpa_supplicant_scan, wpa_s,
1126 NULL);
1127 if (res == 1) {
1128 wpa_dbg(wpa_s, MSG_DEBUG, "Rescheduling scan request: %d.%06d sec",
1129 sec, usec);
1130 } else if (res == 0) {
1131 wpa_dbg(wpa_s, MSG_DEBUG, "Ignore new scan request for %d.%06d sec since an earlier request is scheduled to trigger sooner",
1132 sec, usec);
1133 } else {
1134 wpa_dbg(wpa_s, MSG_DEBUG, "Setting scan request: %d.%06d sec",
1135 sec, usec);
1136 eloop_register_timeout(sec, usec, wpa_supplicant_scan, wpa_s, NULL);
1137 }
1138 }
1139
1140
1141 /**
1142 * wpa_supplicant_delayed_sched_scan - Request a delayed scheduled scan
1143 * @wpa_s: Pointer to wpa_supplicant data
1144 * @sec: Number of seconds after which to scan
1145 * @usec: Number of microseconds after which to scan
1146 * Returns: 0 on success or -1 otherwise
1147 *
1148 * This function is used to schedule periodic scans for neighboring
1149 * access points after the specified time.
1150 */
1151 int wpa_supplicant_delayed_sched_scan(struct wpa_supplicant *wpa_s,
1152 int sec, int usec)
1153 {
1154 if (!wpa_s->sched_scan_supported)
1155 return -1;
1156
1157 eloop_register_timeout(sec, usec,
1158 wpa_supplicant_delayed_sched_scan_timeout,
1159 wpa_s, NULL);
1160
1161 return 0;
1162 }
1163
1164
1165 /**
1166 * wpa_supplicant_req_sched_scan - Start a periodic scheduled scan
1167 * @wpa_s: Pointer to wpa_supplicant data
1168 * Returns: 0 is sched_scan was started or -1 otherwise
1169 *
1170 * This function is used to schedule periodic scans for neighboring
1171 * access points repeating the scan continuously.
1172 */
1173 int wpa_supplicant_req_sched_scan(struct wpa_supplicant *wpa_s)
1174 {
1175 struct wpa_driver_scan_params params;
1176 struct wpa_driver_scan_params *scan_params;
1177 enum wpa_states prev_state;
1178 struct wpa_ssid *ssid = NULL;
1179 struct wpabuf *extra_ie = NULL;
1180 int ret;
1181 unsigned int max_sched_scan_ssids;
1182 int wildcard = 0;
1183 int need_ssids;
1184 struct sched_scan_plan scan_plan;
1185
1186 if (!wpa_s->sched_scan_supported)
1187 return -1;
1188
1189 if (wpa_s->max_sched_scan_ssids > WPAS_MAX_SCAN_SSIDS)
1190 max_sched_scan_ssids = WPAS_MAX_SCAN_SSIDS;
1191 else
1192 max_sched_scan_ssids = wpa_s->max_sched_scan_ssids;
1193 if (max_sched_scan_ssids < 1 || wpa_s->conf->disable_scan_offload)
1194 return -1;
1195
1196 if (wpa_s->sched_scanning) {
1197 wpa_dbg(wpa_s, MSG_DEBUG, "Already sched scanning");
1198 return 0;
1199 }
1200
1201 need_ssids = 0;
1202 for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
1203 if (!wpas_network_disabled(wpa_s, ssid) && !ssid->scan_ssid) {
1204 /* Use wildcard SSID to find this network */
1205 wildcard = 1;
1206 } else if (!wpas_network_disabled(wpa_s, ssid) &&
1207 ssid->ssid_len)
1208 need_ssids++;
1209
1210 #ifdef CONFIG_WPS
1211 if (!wpas_network_disabled(wpa_s, ssid) &&
1212 ssid->key_mgmt == WPA_KEY_MGMT_WPS) {
1213 /*
1214 * Normal scan is more reliable and faster for WPS
1215 * operations and since these are for short periods of
1216 * time, the benefit of trying to use sched_scan would
1217 * be limited.
1218 */
1219 wpa_dbg(wpa_s, MSG_DEBUG, "Use normal scan instead of "
1220 "sched_scan for WPS");
1221 return -1;
1222 }
1223 #endif /* CONFIG_WPS */
1224 }
1225 if (wildcard)
1226 need_ssids++;
1227
1228 if (wpa_s->normal_scans < 3 &&
1229 (need_ssids <= wpa_s->max_scan_ssids ||
1230 wpa_s->max_scan_ssids >= (int) max_sched_scan_ssids)) {
1231 /*
1232 * When normal scan can speed up operations, use that for the
1233 * first operations before starting the sched_scan to allow
1234 * user space sleep more. We do this only if the normal scan
1235 * has functionality that is suitable for this or if the
1236 * sched_scan does not have better support for multiple SSIDs.
1237 */
1238 wpa_dbg(wpa_s, MSG_DEBUG, "Use normal scan instead of "
1239 "sched_scan for initial scans (normal_scans=%d)",
1240 wpa_s->normal_scans);
1241 return -1;
1242 }
1243
1244 os_memset(&params, 0, sizeof(params));
1245
1246 /* If we can't allocate space for the filters, we just don't filter */
1247 params.filter_ssids = os_calloc(wpa_s->max_match_sets,
1248 sizeof(struct wpa_driver_scan_filter));
1249
1250 prev_state = wpa_s->wpa_state;
1251 if (wpa_s->wpa_state == WPA_DISCONNECTED ||
1252 wpa_s->wpa_state == WPA_INACTIVE)
1253 wpa_supplicant_set_state(wpa_s, WPA_SCANNING);
1254
1255 if (wpa_s->autoscan_params != NULL) {
1256 scan_params = wpa_s->autoscan_params;
1257 goto scan;
1258 }
1259
1260 /* Find the starting point from which to continue scanning */
1261 ssid = wpa_s->conf->ssid;
1262 if (wpa_s->prev_sched_ssid) {
1263 while (ssid) {
1264 if (ssid == wpa_s->prev_sched_ssid) {
1265 ssid = ssid->next;
1266 break;
1267 }
1268 ssid = ssid->next;
1269 }
1270 }
1271
1272 if (!ssid || !wpa_s->prev_sched_ssid) {
1273 wpa_dbg(wpa_s, MSG_DEBUG, "Beginning of SSID list");
1274 wpa_s->sched_scan_timeout = max_sched_scan_ssids * 2;
1275 wpa_s->first_sched_scan = 1;
1276 ssid = wpa_s->conf->ssid;
1277 wpa_s->prev_sched_ssid = ssid;
1278 }
1279
1280 if (wildcard) {
1281 wpa_dbg(wpa_s, MSG_DEBUG, "Add wildcard SSID to sched_scan");
1282 params.num_ssids++;
1283 }
1284
1285 while (ssid) {
1286 if (wpas_network_disabled(wpa_s, ssid))
1287 goto next;
1288
1289 if (params.num_filter_ssids < wpa_s->max_match_sets &&
1290 params.filter_ssids && ssid->ssid && ssid->ssid_len) {
1291 wpa_dbg(wpa_s, MSG_DEBUG, "add to filter ssid: %s",
1292 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
1293 os_memcpy(params.filter_ssids[params.num_filter_ssids].ssid,
1294 ssid->ssid, ssid->ssid_len);
1295 params.filter_ssids[params.num_filter_ssids].ssid_len =
1296 ssid->ssid_len;
1297 params.num_filter_ssids++;
1298 } else if (params.filter_ssids && ssid->ssid && ssid->ssid_len)
1299 {
1300 wpa_dbg(wpa_s, MSG_DEBUG, "Not enough room for SSID "
1301 "filter for sched_scan - drop filter");
1302 os_free(params.filter_ssids);
1303 params.filter_ssids = NULL;
1304 params.num_filter_ssids = 0;
1305 }
1306
1307 if (ssid->scan_ssid && ssid->ssid && ssid->ssid_len) {
1308 if (params.num_ssids == max_sched_scan_ssids)
1309 break; /* only room for broadcast SSID */
1310 wpa_dbg(wpa_s, MSG_DEBUG,
1311 "add to active scan ssid: %s",
1312 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
1313 params.ssids[params.num_ssids].ssid =
1314 ssid->ssid;
1315 params.ssids[params.num_ssids].ssid_len =
1316 ssid->ssid_len;
1317 params.num_ssids++;
1318 if (params.num_ssids >= max_sched_scan_ssids) {
1319 wpa_s->prev_sched_ssid = ssid;
1320 do {
1321 ssid = ssid->next;
1322 } while (ssid &&
1323 (wpas_network_disabled(wpa_s, ssid) ||
1324 !ssid->scan_ssid));
1325 break;
1326 }
1327 }
1328
1329 next:
1330 wpa_s->prev_sched_ssid = ssid;
1331 ssid = ssid->next;
1332 }
1333
1334 if (params.num_filter_ssids == 0) {
1335 os_free(params.filter_ssids);
1336 params.filter_ssids = NULL;
1337 }
1338
1339 extra_ie = wpa_supplicant_extra_ies(wpa_s);
1340 if (extra_ie) {
1341 params.extra_ies = wpabuf_head(extra_ie);
1342 params.extra_ies_len = wpabuf_len(extra_ie);
1343 }
1344
1345 if (wpa_s->conf->filter_rssi)
1346 params.filter_rssi = wpa_s->conf->filter_rssi;
1347
1348 /* See if user specified frequencies. If so, scan only those. */
1349 if (wpa_s->conf->freq_list && !params.freqs) {
1350 wpa_dbg(wpa_s, MSG_DEBUG,
1351 "Optimize scan based on conf->freq_list");
1352 int_array_concat(&params.freqs, wpa_s->conf->freq_list);
1353 }
1354
1355 scan_params = &params;
1356
1357 scan:
1358 wpa_s->sched_scan_timed_out = 0;
1359
1360 /*
1361 * We cannot support multiple scan plans if the scan request includes
1362 * too many SSID's, so in this case use only the last scan plan and make
1363 * it run infinitely. It will be stopped by the timeout.
1364 */
1365 if (wpa_s->sched_scan_plans_num == 1 ||
1366 (wpa_s->sched_scan_plans_num && !ssid && wpa_s->first_sched_scan)) {
1367 params.sched_scan_plans = wpa_s->sched_scan_plans;
1368 params.sched_scan_plans_num = wpa_s->sched_scan_plans_num;
1369 } else if (wpa_s->sched_scan_plans_num > 1) {
1370 wpa_dbg(wpa_s, MSG_DEBUG,
1371 "Too many SSIDs. Default to using single scheduled_scan plan");
1372 params.sched_scan_plans =
1373 &wpa_s->sched_scan_plans[wpa_s->sched_scan_plans_num -
1374 1];
1375 params.sched_scan_plans_num = 1;
1376 } else {
1377 if (wpa_s->conf->sched_scan_interval)
1378 scan_plan.interval = wpa_s->conf->sched_scan_interval;
1379 else
1380 scan_plan.interval = 10;
1381
1382 if (scan_plan.interval > wpa_s->max_sched_scan_plan_interval) {
1383 wpa_printf(MSG_WARNING,
1384 "Scan interval too long(%u), use the maximum allowed(%u)",
1385 scan_plan.interval,
1386 wpa_s->max_sched_scan_plan_interval);
1387 scan_plan.interval =
1388 wpa_s->max_sched_scan_plan_interval;
1389 }
1390
1391 scan_plan.iterations = 0;
1392 params.sched_scan_plans = &scan_plan;
1393 params.sched_scan_plans_num = 1;
1394 }
1395
1396 if (ssid || !wpa_s->first_sched_scan) {
1397 wpa_dbg(wpa_s, MSG_DEBUG,
1398 "Starting sched scan: interval %u timeout %d",
1399 params.sched_scan_plans[0].interval,
1400 wpa_s->sched_scan_timeout);
1401 } else {
1402 wpa_dbg(wpa_s, MSG_DEBUG, "Starting sched scan (no timeout)");
1403 }
1404
1405 wpa_setband_scan_freqs(wpa_s, scan_params);
1406
1407 if (wpa_s->mac_addr_rand_enable & MAC_ADDR_RAND_SCHED_SCAN) {
1408 params.mac_addr_rand = 1;
1409 if (wpa_s->mac_addr_sched_scan) {
1410 params.mac_addr = wpa_s->mac_addr_sched_scan;
1411 params.mac_addr_mask = wpa_s->mac_addr_sched_scan +
1412 ETH_ALEN;
1413 }
1414 }
1415
1416 ret = wpa_supplicant_start_sched_scan(wpa_s, scan_params);
1417 wpabuf_free(extra_ie);
1418 os_free(params.filter_ssids);
1419 if (ret) {
1420 wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate sched scan");
1421 if (prev_state != wpa_s->wpa_state)
1422 wpa_supplicant_set_state(wpa_s, prev_state);
1423 return ret;
1424 }
1425
1426 /* If we have more SSIDs to scan, add a timeout so we scan them too */
1427 if (ssid || !wpa_s->first_sched_scan) {
1428 wpa_s->sched_scan_timed_out = 0;
1429 eloop_register_timeout(wpa_s->sched_scan_timeout, 0,
1430 wpa_supplicant_sched_scan_timeout,
1431 wpa_s, NULL);
1432 wpa_s->first_sched_scan = 0;
1433 wpa_s->sched_scan_timeout /= 2;
1434 params.sched_scan_plans[0].interval *= 2;
1435 if ((unsigned int) wpa_s->sched_scan_timeout <
1436 params.sched_scan_plans[0].interval ||
1437 params.sched_scan_plans[0].interval >
1438 wpa_s->max_sched_scan_plan_interval) {
1439 params.sched_scan_plans[0].interval = 10;
1440 wpa_s->sched_scan_timeout = max_sched_scan_ssids * 2;
1441 }
1442 }
1443
1444 /* If there is no more ssids, start next time from the beginning */
1445 if (!ssid)
1446 wpa_s->prev_sched_ssid = NULL;
1447
1448 return 0;
1449 }
1450
1451
1452 /**
1453 * wpa_supplicant_cancel_scan - Cancel a scheduled scan request
1454 * @wpa_s: Pointer to wpa_supplicant data
1455 *
1456 * This function is used to cancel a scan request scheduled with
1457 * wpa_supplicant_req_scan().
1458 */
1459 void wpa_supplicant_cancel_scan(struct wpa_supplicant *wpa_s)
1460 {
1461 wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling scan request");
1462 eloop_cancel_timeout(wpa_supplicant_scan, wpa_s, NULL);
1463 }
1464
1465
1466 /**
1467 * wpa_supplicant_cancel_delayed_sched_scan - Stop a delayed scheduled scan
1468 * @wpa_s: Pointer to wpa_supplicant data
1469 *
1470 * This function is used to stop a delayed scheduled scan.
1471 */
1472 void wpa_supplicant_cancel_delayed_sched_scan(struct wpa_supplicant *wpa_s)
1473 {
1474 if (!wpa_s->sched_scan_supported)
1475 return;
1476
1477 wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling delayed sched scan");
1478 eloop_cancel_timeout(wpa_supplicant_delayed_sched_scan_timeout,
1479 wpa_s, NULL);
1480 }
1481
1482
1483 /**
1484 * wpa_supplicant_cancel_sched_scan - Stop running scheduled scans
1485 * @wpa_s: Pointer to wpa_supplicant data
1486 *
1487 * This function is used to stop a periodic scheduled scan.
1488 */
1489 void wpa_supplicant_cancel_sched_scan(struct wpa_supplicant *wpa_s)
1490 {
1491 if (!wpa_s->sched_scanning)
1492 return;
1493
1494 wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling sched scan");
1495 eloop_cancel_timeout(wpa_supplicant_sched_scan_timeout, wpa_s, NULL);
1496 wpa_supplicant_stop_sched_scan(wpa_s);
1497 }
1498
1499
1500 /**
1501 * wpa_supplicant_notify_scanning - Indicate possible scan state change
1502 * @wpa_s: Pointer to wpa_supplicant data
1503 * @scanning: Whether scanning is currently in progress
1504 *
1505 * This function is to generate scanning notifycations. It is called whenever
1506 * there may have been a change in scanning (scan started, completed, stopped).
1507 * wpas_notify_scanning() is called whenever the scanning state changed from the
1508 * previously notified state.
1509 */
1510 void wpa_supplicant_notify_scanning(struct wpa_supplicant *wpa_s,
1511 int scanning)
1512 {
1513 if (wpa_s->scanning != scanning) {
1514 wpa_s->scanning = scanning;
1515 wpas_notify_scanning(wpa_s);
1516 }
1517 }
1518
1519
1520 static int wpa_scan_get_max_rate(const struct wpa_scan_res *res)
1521 {
1522 int rate = 0;
1523 const u8 *ie;
1524 int i;
1525
1526 ie = wpa_scan_get_ie(res, WLAN_EID_SUPP_RATES);
1527 for (i = 0; ie && i < ie[1]; i++) {
1528 if ((ie[i + 2] & 0x7f) > rate)
1529 rate = ie[i + 2] & 0x7f;
1530 }
1531
1532 ie = wpa_scan_get_ie(res, WLAN_EID_EXT_SUPP_RATES);
1533 for (i = 0; ie && i < ie[1]; i++) {
1534 if ((ie[i + 2] & 0x7f) > rate)
1535 rate = ie[i + 2] & 0x7f;
1536 }
1537
1538 return rate;
1539 }
1540
1541
1542 /**
1543 * wpa_scan_get_ie - Fetch a specified information element from a scan result
1544 * @res: Scan result entry
1545 * @ie: Information element identitifier (WLAN_EID_*)
1546 * Returns: Pointer to the information element (id field) or %NULL if not found
1547 *
1548 * This function returns the first matching information element in the scan
1549 * result.
1550 */
1551 const u8 * wpa_scan_get_ie(const struct wpa_scan_res *res, u8 ie)
1552 {
1553 const u8 *end, *pos;
1554
1555 pos = (const u8 *) (res + 1);
1556 end = pos + res->ie_len;
1557
1558 while (end - pos > 1) {
1559 if (2 + pos[1] > end - pos)
1560 break;
1561 if (pos[0] == ie)
1562 return pos;
1563 pos += 2 + pos[1];
1564 }
1565
1566 return NULL;
1567 }
1568
1569
1570 /**
1571 * wpa_scan_get_vendor_ie - Fetch vendor information element from a scan result
1572 * @res: Scan result entry
1573 * @vendor_type: Vendor type (four octets starting the IE payload)
1574 * Returns: Pointer to the information element (id field) or %NULL if not found
1575 *
1576 * This function returns the first matching information element in the scan
1577 * result.
1578 */
1579 const u8 * wpa_scan_get_vendor_ie(const struct wpa_scan_res *res,
1580 u32 vendor_type)
1581 {
1582 const u8 *end, *pos;
1583
1584 pos = (const u8 *) (res + 1);
1585 end = pos + res->ie_len;
1586
1587 while (end - pos > 1) {
1588 if (2 + pos[1] > end - pos)
1589 break;
1590 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1591 vendor_type == WPA_GET_BE32(&pos[2]))
1592 return pos;
1593 pos += 2 + pos[1];
1594 }
1595
1596 return NULL;
1597 }
1598
1599
1600 /**
1601 * wpa_scan_get_vendor_ie_beacon - Fetch vendor information from a scan result
1602 * @res: Scan result entry
1603 * @vendor_type: Vendor type (four octets starting the IE payload)
1604 * Returns: Pointer to the information element (id field) or %NULL if not found
1605 *
1606 * This function returns the first matching information element in the scan
1607 * result.
1608 *
1609 * This function is like wpa_scan_get_vendor_ie(), but uses IE buffer only
1610 * from Beacon frames instead of either Beacon or Probe Response frames.
1611 */
1612 const u8 * wpa_scan_get_vendor_ie_beacon(const struct wpa_scan_res *res,
1613 u32 vendor_type)
1614 {
1615 const u8 *end, *pos;
1616
1617 if (res->beacon_ie_len == 0)
1618 return NULL;
1619
1620 pos = (const u8 *) (res + 1);
1621 pos += res->ie_len;
1622 end = pos + res->beacon_ie_len;
1623
1624 while (end - pos > 1) {
1625 if (2 + pos[1] > end - pos)
1626 break;
1627 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1628 vendor_type == WPA_GET_BE32(&pos[2]))
1629 return pos;
1630 pos += 2 + pos[1];
1631 }
1632
1633 return NULL;
1634 }
1635
1636
1637 /**
1638 * wpa_scan_get_vendor_ie_multi - Fetch vendor IE data from a scan result
1639 * @res: Scan result entry
1640 * @vendor_type: Vendor type (four octets starting the IE payload)
1641 * Returns: Pointer to the information element payload or %NULL if not found
1642 *
1643 * This function returns concatenated payload of possibly fragmented vendor
1644 * specific information elements in the scan result. The caller is responsible
1645 * for freeing the returned buffer.
1646 */
1647 struct wpabuf * wpa_scan_get_vendor_ie_multi(const struct wpa_scan_res *res,
1648 u32 vendor_type)
1649 {
1650 struct wpabuf *buf;
1651 const u8 *end, *pos;
1652
1653 buf = wpabuf_alloc(res->ie_len);
1654 if (buf == NULL)
1655 return NULL;
1656
1657 pos = (const u8 *) (res + 1);
1658 end = pos + res->ie_len;
1659
1660 while (end - pos > 1) {
1661 if (2 + pos[1] > end - pos)
1662 break;
1663 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1664 vendor_type == WPA_GET_BE32(&pos[2]))
1665 wpabuf_put_data(buf, pos + 2 + 4, pos[1] - 4);
1666 pos += 2 + pos[1];
1667 }
1668
1669 if (wpabuf_len(buf) == 0) {
1670 wpabuf_free(buf);
1671 buf = NULL;
1672 }
1673
1674 return buf;
1675 }
1676
1677
1678 /*
1679 * Channels with a great SNR can operate at full rate. What is a great SNR?
1680 * This doc https://supportforums.cisco.com/docs/DOC-12954 says, "the general
1681 * rule of thumb is that any SNR above 20 is good." This one
1682 * http://www.cisco.com/en/US/tech/tk722/tk809/technologies_q_and_a_item09186a00805e9a96.shtml#qa23
1683 * recommends 25 as a minimum SNR for 54 Mbps data rate. 30 is chosen here as a
1684 * conservative value.
1685 */
1686 #define GREAT_SNR 30
1687
1688 #define IS_5GHZ(n) (n > 4000)
1689
1690 /* Compare function for sorting scan results. Return >0 if @b is considered
1691 * better. */
1692 static int wpa_scan_result_compar(const void *a, const void *b)
1693 {
1694 #define MIN(a,b) a < b ? a : b
1695 struct wpa_scan_res **_wa = (void *) a;
1696 struct wpa_scan_res **_wb = (void *) b;
1697 struct wpa_scan_res *wa = *_wa;
1698 struct wpa_scan_res *wb = *_wb;
1699 int wpa_a, wpa_b;
1700 int snr_a, snr_b, snr_a_full, snr_b_full;
1701
1702 /* WPA/WPA2 support preferred */
1703 wpa_a = wpa_scan_get_vendor_ie(wa, WPA_IE_VENDOR_TYPE) != NULL ||
1704 wpa_scan_get_ie(wa, WLAN_EID_RSN) != NULL;
1705 wpa_b = wpa_scan_get_vendor_ie(wb, WPA_IE_VENDOR_TYPE) != NULL ||
1706 wpa_scan_get_ie(wb, WLAN_EID_RSN) != NULL;
1707
1708 if (wpa_b && !wpa_a)
1709 return 1;
1710 if (!wpa_b && wpa_a)
1711 return -1;
1712
1713 /* privacy support preferred */
1714 if ((wa->caps & IEEE80211_CAP_PRIVACY) == 0 &&
1715 (wb->caps & IEEE80211_CAP_PRIVACY))
1716 return 1;
1717 if ((wa->caps & IEEE80211_CAP_PRIVACY) &&
1718 (wb->caps & IEEE80211_CAP_PRIVACY) == 0)
1719 return -1;
1720
1721 if (wa->flags & wb->flags & WPA_SCAN_LEVEL_DBM) {
1722 snr_a_full = wa->snr;
1723 snr_a = MIN(wa->snr, GREAT_SNR);
1724 snr_b_full = wb->snr;
1725 snr_b = MIN(wb->snr, GREAT_SNR);
1726 } else {
1727 /* Level is not in dBm, so we can't calculate
1728 * SNR. Just use raw level (units unknown). */
1729 snr_a = snr_a_full = wa->level;
1730 snr_b = snr_b_full = wb->level;
1731 }
1732
1733 /* if SNR is close, decide by max rate or frequency band */
1734 if ((snr_a && snr_b && abs(snr_b - snr_a) < 5) ||
1735 (wa->qual && wb->qual && abs(wb->qual - wa->qual) < 10)) {
1736 if (wa->est_throughput != wb->est_throughput)
1737 return wb->est_throughput - wa->est_throughput;
1738 if (IS_5GHZ(wa->freq) ^ IS_5GHZ(wb->freq))
1739 return IS_5GHZ(wa->freq) ? -1 : 1;
1740 }
1741
1742 /* all things being equal, use SNR; if SNRs are
1743 * identical, use quality values since some drivers may only report
1744 * that value and leave the signal level zero */
1745 if (snr_b_full == snr_a_full)
1746 return wb->qual - wa->qual;
1747 return snr_b_full - snr_a_full;
1748 #undef MIN
1749 }
1750
1751
1752 #ifdef CONFIG_WPS
1753 /* Compare function for sorting scan results when searching a WPS AP for
1754 * provisioning. Return >0 if @b is considered better. */
1755 static int wpa_scan_result_wps_compar(const void *a, const void *b)
1756 {
1757 struct wpa_scan_res **_wa = (void *) a;
1758 struct wpa_scan_res **_wb = (void *) b;
1759 struct wpa_scan_res *wa = *_wa;
1760 struct wpa_scan_res *wb = *_wb;
1761 int uses_wps_a, uses_wps_b;
1762 struct wpabuf *wps_a, *wps_b;
1763 int res;
1764
1765 /* Optimization - check WPS IE existence before allocated memory and
1766 * doing full reassembly. */
1767 uses_wps_a = wpa_scan_get_vendor_ie(wa, WPS_IE_VENDOR_TYPE) != NULL;
1768 uses_wps_b = wpa_scan_get_vendor_ie(wb, WPS_IE_VENDOR_TYPE) != NULL;
1769 if (uses_wps_a && !uses_wps_b)
1770 return -1;
1771 if (!uses_wps_a && uses_wps_b)
1772 return 1;
1773
1774 if (uses_wps_a && uses_wps_b) {
1775 wps_a = wpa_scan_get_vendor_ie_multi(wa, WPS_IE_VENDOR_TYPE);
1776 wps_b = wpa_scan_get_vendor_ie_multi(wb, WPS_IE_VENDOR_TYPE);
1777 res = wps_ap_priority_compar(wps_a, wps_b);
1778 wpabuf_free(wps_a);
1779 wpabuf_free(wps_b);
1780 if (res)
1781 return res;
1782 }
1783
1784 /*
1785 * Do not use current AP security policy as a sorting criteria during
1786 * WPS provisioning step since the AP may get reconfigured at the
1787 * completion of provisioning.
1788 */
1789
1790 /* all things being equal, use signal level; if signal levels are
1791 * identical, use quality values since some drivers may only report
1792 * that value and leave the signal level zero */
1793 if (wb->level == wa->level)
1794 return wb->qual - wa->qual;
1795 return wb->level - wa->level;
1796 }
1797 #endif /* CONFIG_WPS */
1798
1799
1800 static void dump_scan_res(struct wpa_scan_results *scan_res)
1801 {
1802 #ifndef CONFIG_NO_STDOUT_DEBUG
1803 size_t i;
1804
1805 if (scan_res->res == NULL || scan_res->num == 0)
1806 return;
1807
1808 wpa_printf(MSG_EXCESSIVE, "Sorted scan results");
1809
1810 for (i = 0; i < scan_res->num; i++) {
1811 struct wpa_scan_res *r = scan_res->res[i];
1812 u8 *pos;
1813 if (r->flags & WPA_SCAN_LEVEL_DBM) {
1814 int noise_valid = !(r->flags & WPA_SCAN_NOISE_INVALID);
1815
1816 wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d "
1817 "noise=%d%s level=%d snr=%d%s flags=0x%x age=%u est=%u",
1818 MAC2STR(r->bssid), r->freq, r->qual,
1819 r->noise, noise_valid ? "" : "~", r->level,
1820 r->snr, r->snr >= GREAT_SNR ? "*" : "",
1821 r->flags,
1822 r->age, r->est_throughput);
1823 } else {
1824 wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d "
1825 "noise=%d level=%d flags=0x%x age=%u est=%u",
1826 MAC2STR(r->bssid), r->freq, r->qual,
1827 r->noise, r->level, r->flags, r->age,
1828 r->est_throughput);
1829 }
1830 pos = (u8 *) (r + 1);
1831 if (r->ie_len)
1832 wpa_hexdump(MSG_EXCESSIVE, "IEs", pos, r->ie_len);
1833 pos += r->ie_len;
1834 if (r->beacon_ie_len)
1835 wpa_hexdump(MSG_EXCESSIVE, "Beacon IEs",
1836 pos, r->beacon_ie_len);
1837 }
1838 #endif /* CONFIG_NO_STDOUT_DEBUG */
1839 }
1840
1841
1842 /**
1843 * wpa_supplicant_filter_bssid_match - Is the specified BSSID allowed
1844 * @wpa_s: Pointer to wpa_supplicant data
1845 * @bssid: BSSID to check
1846 * Returns: 0 if the BSSID is filtered or 1 if not
1847 *
1848 * This function is used to filter out specific BSSIDs from scan reslts mainly
1849 * for testing purposes (SET bssid_filter ctrl_iface command).
1850 */
1851 int wpa_supplicant_filter_bssid_match(struct wpa_supplicant *wpa_s,
1852 const u8 *bssid)
1853 {
1854 size_t i;
1855
1856 if (wpa_s->bssid_filter == NULL)
1857 return 1;
1858
1859 for (i = 0; i < wpa_s->bssid_filter_count; i++) {
1860 if (os_memcmp(wpa_s->bssid_filter + i * ETH_ALEN, bssid,
1861 ETH_ALEN) == 0)
1862 return 1;
1863 }
1864
1865 return 0;
1866 }
1867
1868
1869 static void filter_scan_res(struct wpa_supplicant *wpa_s,
1870 struct wpa_scan_results *res)
1871 {
1872 size_t i, j;
1873
1874 if (wpa_s->bssid_filter == NULL)
1875 return;
1876
1877 for (i = 0, j = 0; i < res->num; i++) {
1878 if (wpa_supplicant_filter_bssid_match(wpa_s,
1879 res->res[i]->bssid)) {
1880 res->res[j++] = res->res[i];
1881 } else {
1882 os_free(res->res[i]);
1883 res->res[i] = NULL;
1884 }
1885 }
1886
1887 if (res->num != j) {
1888 wpa_printf(MSG_DEBUG, "Filtered out %d scan results",
1889 (int) (res->num - j));
1890 res->num = j;
1891 }
1892 }
1893
1894
1895 /*
1896 * Noise floor values to use when we have signal strength
1897 * measurements, but no noise floor measurments. These values were
1898 * measured in an office environment with many APs.
1899 */
1900 #define DEFAULT_NOISE_FLOOR_2GHZ (-89)
1901 #define DEFAULT_NOISE_FLOOR_5GHZ (-92)
1902
1903 static void scan_snr(struct wpa_scan_res *res)
1904 {
1905 if (res->flags & WPA_SCAN_NOISE_INVALID) {
1906 res->noise = IS_5GHZ(res->freq) ?
1907 DEFAULT_NOISE_FLOOR_5GHZ :
1908 DEFAULT_NOISE_FLOOR_2GHZ;
1909 }
1910
1911 if (res->flags & WPA_SCAN_LEVEL_DBM) {
1912 res->snr = res->level - res->noise;
1913 } else {
1914 /* Level is not in dBm, so we can't calculate
1915 * SNR. Just use raw level (units unknown). */
1916 res->snr = res->level;
1917 }
1918 }
1919
1920
1921 static unsigned int max_ht20_rate(int snr)
1922 {
1923 if (snr < 6)
1924 return 6500; /* HT20 MCS0 */
1925 if (snr < 8)
1926 return 13000; /* HT20 MCS1 */
1927 if (snr < 13)
1928 return 19500; /* HT20 MCS2 */
1929 if (snr < 17)
1930 return 26000; /* HT20 MCS3 */
1931 if (snr < 20)
1932 return 39000; /* HT20 MCS4 */
1933 if (snr < 23)
1934 return 52000; /* HT20 MCS5 */
1935 if (snr < 24)
1936 return 58500; /* HT20 MCS6 */
1937 return 65000; /* HT20 MCS7 */
1938 }
1939
1940
1941 static unsigned int max_ht40_rate(int snr)
1942 {
1943 if (snr < 3)
1944 return 13500; /* HT40 MCS0 */
1945 if (snr < 6)
1946 return 27000; /* HT40 MCS1 */
1947 if (snr < 10)
1948 return 40500; /* HT40 MCS2 */
1949 if (snr < 15)
1950 return 54000; /* HT40 MCS3 */
1951 if (snr < 17)
1952 return 81000; /* HT40 MCS4 */
1953 if (snr < 22)
1954 return 108000; /* HT40 MCS5 */
1955 if (snr < 24)
1956 return 121500; /* HT40 MCS6 */
1957 return 135000; /* HT40 MCS7 */
1958 }
1959
1960
1961 static unsigned int max_vht80_rate(int snr)
1962 {
1963 if (snr < 1)
1964 return 0;
1965 if (snr < 2)
1966 return 29300; /* VHT80 MCS0 */
1967 if (snr < 5)
1968 return 58500; /* VHT80 MCS1 */
1969 if (snr < 9)
1970 return 87800; /* VHT80 MCS2 */
1971 if (snr < 11)
1972 return 117000; /* VHT80 MCS3 */
1973 if (snr < 15)
1974 return 175500; /* VHT80 MCS4 */
1975 if (snr < 16)
1976 return 234000; /* VHT80 MCS5 */
1977 if (snr < 18)
1978 return 263300; /* VHT80 MCS6 */
1979 if (snr < 20)
1980 return 292500; /* VHT80 MCS7 */
1981 if (snr < 22)
1982 return 351000; /* VHT80 MCS8 */
1983 return 390000; /* VHT80 MCS9 */
1984 }
1985
1986
1987 static void scan_est_throughput(struct wpa_supplicant *wpa_s,
1988 struct wpa_scan_res *res)
1989 {
1990 enum local_hw_capab capab = wpa_s->hw_capab;
1991 int rate; /* max legacy rate in 500 kb/s units */
1992 const u8 *ie;
1993 unsigned int est, tmp;
1994 int snr = res->snr;
1995
1996 if (res->est_throughput)
1997 return;
1998
1999 /* Get maximum legacy rate */
2000 rate = wpa_scan_get_max_rate(res);
2001
2002 /* Limit based on estimated SNR */
2003 if (rate > 1 * 2 && snr < 1)
2004 rate = 1 * 2;
2005 else if (rate > 2 * 2 && snr < 4)
2006 rate = 2 * 2;
2007 else if (rate > 6 * 2 && snr < 5)
2008 rate = 6 * 2;
2009 else if (rate > 9 * 2 && snr < 6)
2010 rate = 9 * 2;
2011 else if (rate > 12 * 2 && snr < 7)
2012 rate = 12 * 2;
2013 else if (rate > 18 * 2 && snr < 10)
2014 rate = 18 * 2;
2015 else if (rate > 24 * 2 && snr < 11)
2016 rate = 24 * 2;
2017 else if (rate > 36 * 2 && snr < 15)
2018 rate = 36 * 2;
2019 else if (rate > 48 * 2 && snr < 19)
2020 rate = 48 * 2;
2021 else if (rate > 54 * 2 && snr < 21)
2022 rate = 54 * 2;
2023 est = rate * 500;
2024
2025 if (capab == CAPAB_HT || capab == CAPAB_HT40 || capab == CAPAB_VHT) {
2026 ie = wpa_scan_get_ie(res, WLAN_EID_HT_CAP);
2027 if (ie) {
2028 tmp = max_ht20_rate(snr);
2029 if (tmp > est)
2030 est = tmp;
2031 }
2032 }
2033
2034 if (capab == CAPAB_HT40 || capab == CAPAB_VHT) {
2035 ie = wpa_scan_get_ie(res, WLAN_EID_HT_OPERATION);
2036 if (ie && ie[1] >= 2 &&
2037 (ie[3] & HT_INFO_HT_PARAM_SECONDARY_CHNL_OFF_MASK)) {
2038 tmp = max_ht40_rate(snr);
2039 if (tmp > est)
2040 est = tmp;
2041 }
2042 }
2043
2044 if (capab == CAPAB_VHT) {
2045 /* Use +1 to assume VHT is always faster than HT */
2046 ie = wpa_scan_get_ie(res, WLAN_EID_VHT_CAP);
2047 if (ie) {
2048 tmp = max_ht20_rate(snr) + 1;
2049 if (tmp > est)
2050 est = tmp;
2051
2052 ie = wpa_scan_get_ie(res, WLAN_EID_HT_OPERATION);
2053 if (ie && ie[1] >= 2 &&
2054 (ie[3] &
2055 HT_INFO_HT_PARAM_SECONDARY_CHNL_OFF_MASK)) {
2056 tmp = max_ht40_rate(snr) + 1;
2057 if (tmp > est)
2058 est = tmp;
2059 }
2060
2061 ie = wpa_scan_get_ie(res, WLAN_EID_VHT_OPERATION);
2062 if (ie && ie[1] >= 1 &&
2063 (ie[2] & VHT_OPMODE_CHANNEL_WIDTH_MASK)) {
2064 tmp = max_vht80_rate(snr) + 1;
2065 if (tmp > est)
2066 est = tmp;
2067 }
2068 }
2069 }
2070
2071 /* TODO: channel utilization and AP load (e.g., from AP Beacon) */
2072
2073 res->est_throughput = est;
2074 }
2075
2076
2077 /**
2078 * wpa_supplicant_get_scan_results - Get scan results
2079 * @wpa_s: Pointer to wpa_supplicant data
2080 * @info: Information about what was scanned or %NULL if not available
2081 * @new_scan: Whether a new scan was performed
2082 * Returns: Scan results, %NULL on failure
2083 *
2084 * This function request the current scan results from the driver and updates
2085 * the local BSS list wpa_s->bss. The caller is responsible for freeing the
2086 * results with wpa_scan_results_free().
2087 */
2088 struct wpa_scan_results *
2089 wpa_supplicant_get_scan_results(struct wpa_supplicant *wpa_s,
2090 struct scan_info *info, int new_scan)
2091 {
2092 struct wpa_scan_results *scan_res;
2093 size_t i;
2094 int (*compar)(const void *, const void *) = wpa_scan_result_compar;
2095
2096 scan_res = wpa_drv_get_scan_results2(wpa_s);
2097 if (scan_res == NULL) {
2098 wpa_dbg(wpa_s, MSG_DEBUG, "Failed to get scan results");
2099 return NULL;
2100 }
2101 if (scan_res->fetch_time.sec == 0) {
2102 /*
2103 * Make sure we have a valid timestamp if the driver wrapper
2104 * does not set this.
2105 */
2106 os_get_reltime(&scan_res->fetch_time);
2107 }
2108 filter_scan_res(wpa_s, scan_res);
2109
2110 for (i = 0; i < scan_res->num; i++) {
2111 struct wpa_scan_res *scan_res_item = scan_res->res[i];
2112
2113 scan_snr(scan_res_item);
2114 scan_est_throughput(wpa_s, scan_res_item);
2115 }
2116
2117 #ifdef CONFIG_WPS
2118 if (wpas_wps_searching(wpa_s)) {
2119 wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Order scan results with WPS "
2120 "provisioning rules");
2121 compar = wpa_scan_result_wps_compar;
2122 }
2123 #endif /* CONFIG_WPS */
2124
2125 qsort(scan_res->res, scan_res->num, sizeof(struct wpa_scan_res *),
2126 compar);
2127 dump_scan_res(scan_res);
2128
2129 wpa_bss_update_start(wpa_s);
2130 for (i = 0; i < scan_res->num; i++)
2131 wpa_bss_update_scan_res(wpa_s, scan_res->res[i],
2132 &scan_res->fetch_time);
2133 wpa_bss_update_end(wpa_s, info, new_scan);
2134
2135 return scan_res;
2136 }
2137
2138
2139 /**
2140 * wpa_supplicant_update_scan_results - Update scan results from the driver
2141 * @wpa_s: Pointer to wpa_supplicant data
2142 * Returns: 0 on success, -1 on failure
2143 *
2144 * This function updates the BSS table within wpa_supplicant based on the
2145 * currently available scan results from the driver without requesting a new
2146 * scan. This is used in cases where the driver indicates an association
2147 * (including roaming within ESS) and wpa_supplicant does not yet have the
2148 * needed information to complete the connection (e.g., to perform validation
2149 * steps in 4-way handshake).
2150 */
2151 int wpa_supplicant_update_scan_results(struct wpa_supplicant *wpa_s)
2152 {
2153 struct wpa_scan_results *scan_res;
2154 scan_res = wpa_supplicant_get_scan_results(wpa_s, NULL, 0);
2155 if (scan_res == NULL)
2156 return -1;
2157 wpa_scan_results_free(scan_res);
2158
2159 return 0;
2160 }
2161
2162
2163 /**
2164 * scan_only_handler - Reports scan results
2165 */
2166 void scan_only_handler(struct wpa_supplicant *wpa_s,
2167 struct wpa_scan_results *scan_res)
2168 {
2169 wpa_dbg(wpa_s, MSG_DEBUG, "Scan-only results received");
2170 if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
2171 wpa_s->manual_scan_use_id && wpa_s->own_scan_running) {
2172 wpa_msg_ctrl(wpa_s, MSG_INFO, WPA_EVENT_SCAN_RESULTS "id=%u",
2173 wpa_s->manual_scan_id);
2174 wpa_s->manual_scan_use_id = 0;
2175 } else {
2176 wpa_msg_ctrl(wpa_s, MSG_INFO, WPA_EVENT_SCAN_RESULTS);
2177 }
2178 wpas_notify_scan_results(wpa_s);
2179 wpas_notify_scan_done(wpa_s, 1);
2180 if (wpa_s->scan_work) {
2181 struct wpa_radio_work *work = wpa_s->scan_work;
2182 wpa_s->scan_work = NULL;
2183 radio_work_done(work);
2184 }
2185
2186 if (wpa_s->wpa_state == WPA_SCANNING)
2187 wpa_supplicant_set_state(wpa_s, wpa_s->scan_prev_wpa_state);
2188 }
2189
2190
2191 int wpas_scan_scheduled(struct wpa_supplicant *wpa_s)
2192 {
2193 return eloop_is_timeout_registered(wpa_supplicant_scan, wpa_s, NULL);
2194 }
2195
2196
2197 struct wpa_driver_scan_params *
2198 wpa_scan_clone_params(const struct wpa_driver_scan_params *src)
2199 {
2200 struct wpa_driver_scan_params *params;
2201 size_t i;
2202 u8 *n;
2203
2204 params = os_zalloc(sizeof(*params));
2205 if (params == NULL)
2206 return NULL;
2207
2208 for (i = 0; i < src->num_ssids; i++) {
2209 if (src->ssids[i].ssid) {
2210 n = os_malloc(src->ssids[i].ssid_len);
2211 if (n == NULL)
2212 goto failed;
2213 os_memcpy(n, src->ssids[i].ssid,
2214 src->ssids[i].ssid_len);
2215 params->ssids[i].ssid = n;
2216 params->ssids[i].ssid_len = src->ssids[i].ssid_len;
2217 }
2218 }
2219 params->num_ssids = src->num_ssids;
2220
2221 if (src->extra_ies) {
2222 n = os_malloc(src->extra_ies_len);
2223 if (n == NULL)
2224 goto failed;
2225 os_memcpy(n, src->extra_ies, src->extra_ies_len);
2226 params->extra_ies = n;
2227 params->extra_ies_len = src->extra_ies_len;
2228 }
2229
2230 if (src->freqs) {
2231 int len = int_array_len(src->freqs);
2232 params->freqs = os_malloc((len + 1) * sizeof(int));
2233 if (params->freqs == NULL)
2234 goto failed;
2235 os_memcpy(params->freqs, src->freqs, (len + 1) * sizeof(int));
2236 }
2237
2238 if (src->filter_ssids) {
2239 params->filter_ssids = os_malloc(sizeof(*params->filter_ssids) *
2240 src->num_filter_ssids);
2241 if (params->filter_ssids == NULL)
2242 goto failed;
2243 os_memcpy(params->filter_ssids, src->filter_ssids,
2244 sizeof(*params->filter_ssids) *
2245 src->num_filter_ssids);
2246 params->num_filter_ssids = src->num_filter_ssids;
2247 }
2248
2249 params->filter_rssi = src->filter_rssi;
2250 params->p2p_probe = src->p2p_probe;
2251 params->only_new_results = src->only_new_results;
2252 params->low_priority = src->low_priority;
2253
2254 if (src->sched_scan_plans_num > 0) {
2255 params->sched_scan_plans =
2256 os_malloc(sizeof(*src->sched_scan_plans) *
2257 src->sched_scan_plans_num);
2258 if (!params->sched_scan_plans)
2259 goto failed;
2260
2261 os_memcpy(params->sched_scan_plans, src->sched_scan_plans,
2262 sizeof(*src->sched_scan_plans) *
2263 src->sched_scan_plans_num);
2264 params->sched_scan_plans_num = src->sched_scan_plans_num;
2265 }
2266
2267 if (src->mac_addr_rand) {
2268 params->mac_addr_rand = src->mac_addr_rand;
2269
2270 if (src->mac_addr && src->mac_addr_mask) {
2271 u8 *mac_addr;
2272
2273 mac_addr = os_malloc(2 * ETH_ALEN);
2274 if (!mac_addr)
2275 goto failed;
2276
2277 os_memcpy(mac_addr, src->mac_addr, ETH_ALEN);
2278 os_memcpy(mac_addr + ETH_ALEN, src->mac_addr_mask,
2279 ETH_ALEN);
2280 params->mac_addr = mac_addr;
2281 params->mac_addr_mask = mac_addr + ETH_ALEN;
2282 }
2283 }
2284 return params;
2285
2286 failed:
2287 wpa_scan_free_params(params);
2288 return NULL;
2289 }
2290
2291
2292 void wpa_scan_free_params(struct wpa_driver_scan_params *params)
2293 {
2294 size_t i;
2295
2296 if (params == NULL)
2297 return;
2298
2299 for (i = 0; i < params->num_ssids; i++)
2300 os_free((u8 *) params->ssids[i].ssid);
2301 os_free((u8 *) params->extra_ies);
2302 os_free(params->freqs);
2303 os_free(params->filter_ssids);
2304 os_free(params->sched_scan_plans);
2305
2306 /*
2307 * Note: params->mac_addr_mask points to same memory allocation and
2308 * must not be freed separately.
2309 */
2310 os_free((u8 *) params->mac_addr);
2311
2312 os_free(params);
2313 }
2314
2315
2316 int wpas_start_pno(struct wpa_supplicant *wpa_s)
2317 {
2318 int ret, prio;
2319 size_t i, num_ssid, num_match_ssid;
2320 struct wpa_ssid *ssid;
2321 struct wpa_driver_scan_params params;
2322 struct sched_scan_plan scan_plan;
2323
2324 if (!wpa_s->sched_scan_supported)
2325 return -1;
2326
2327 if (wpa_s->pno || wpa_s->pno_sched_pending)
2328 return 0;
2329
2330 if ((wpa_s->wpa_state > WPA_SCANNING) &&
2331 (wpa_s->wpa_state <= WPA_COMPLETED)) {
2332 wpa_printf(MSG_ERROR, "PNO: In assoc process");
2333 return -EAGAIN;
2334 }
2335
2336 if (wpa_s->wpa_state == WPA_SCANNING) {
2337 wpa_supplicant_cancel_scan(wpa_s);
2338 if (wpa_s->sched_scanning) {
2339 wpa_printf(MSG_DEBUG, "Schedule PNO on completion of "
2340 "ongoing sched scan");
2341 wpa_supplicant_cancel_sched_scan(wpa_s);
2342 wpa_s->pno_sched_pending = 1;
2343 return 0;
2344 }
2345 }
2346
2347 os_memset(&params, 0, sizeof(params));
2348
2349 num_ssid = num_match_ssid = 0;
2350 ssid = wpa_s->conf->ssid;
2351 while (ssid) {
2352 if (!wpas_network_disabled(wpa_s, ssid)) {
2353 num_match_ssid++;
2354 if (ssid->scan_ssid)
2355 num_ssid++;
2356 }
2357 ssid = ssid->next;
2358 }
2359
2360 if (num_match_ssid == 0) {
2361 wpa_printf(MSG_DEBUG, "PNO: No configured SSIDs");
2362 return -1;
2363 }
2364
2365 if (num_match_ssid > num_ssid) {
2366 params.num_ssids++; /* wildcard */
2367 num_ssid++;
2368 }
2369
2370 if (num_ssid > WPAS_MAX_SCAN_SSIDS) {
2371 wpa_printf(MSG_DEBUG, "PNO: Use only the first %u SSIDs from "
2372 "%u", WPAS_MAX_SCAN_SSIDS, (unsigned int) num_ssid);
2373 num_ssid = WPAS_MAX_SCAN_SSIDS;
2374 }
2375
2376 if (num_match_ssid > wpa_s->max_match_sets) {
2377 num_match_ssid = wpa_s->max_match_sets;
2378 wpa_dbg(wpa_s, MSG_DEBUG, "PNO: Too many SSIDs to match");
2379 }
2380 params.filter_ssids = os_calloc(num_match_ssid,
2381 sizeof(struct wpa_driver_scan_filter));
2382 if (params.filter_ssids == NULL)
2383 return -1;
2384
2385 i = 0;
2386 prio = 0;
2387 ssid = wpa_s->conf->pssid[prio];
2388 while (ssid) {
2389 if (!wpas_network_disabled(wpa_s, ssid)) {
2390 if (ssid->scan_ssid && params.num_ssids < num_ssid) {
2391 params.ssids[params.num_ssids].ssid =
2392 ssid->ssid;
2393 params.ssids[params.num_ssids].ssid_len =
2394 ssid->ssid_len;
2395 params.num_ssids++;
2396 }
2397 os_memcpy(params.filter_ssids[i].ssid, ssid->ssid,
2398 ssid->ssid_len);
2399 params.filter_ssids[i].ssid_len = ssid->ssid_len;
2400 params.num_filter_ssids++;
2401 i++;
2402 if (i == num_match_ssid)
2403 break;
2404 }
2405 if (ssid->pnext)
2406 ssid = ssid->pnext;
2407 else if (prio + 1 == wpa_s->conf->num_prio)
2408 break;
2409 else
2410 ssid = wpa_s->conf->pssid[++prio];
2411 }
2412
2413 if (wpa_s->conf->filter_rssi)
2414 params.filter_rssi = wpa_s->conf->filter_rssi;
2415
2416 if (wpa_s->sched_scan_plans_num) {
2417 params.sched_scan_plans = wpa_s->sched_scan_plans;
2418 params.sched_scan_plans_num = wpa_s->sched_scan_plans_num;
2419 } else {
2420 /* Set one scan plan that will run infinitely */
2421 if (wpa_s->conf->sched_scan_interval)
2422 scan_plan.interval = wpa_s->conf->sched_scan_interval;
2423 else
2424 scan_plan.interval = 10;
2425
2426 scan_plan.iterations = 0;
2427 params.sched_scan_plans = &scan_plan;
2428 params.sched_scan_plans_num = 1;
2429 }
2430
2431 if (params.freqs == NULL && wpa_s->manual_sched_scan_freqs) {
2432 wpa_dbg(wpa_s, MSG_DEBUG, "Limit sched scan to specified channels");
2433 params.freqs = wpa_s->manual_sched_scan_freqs;
2434 }
2435
2436 if (wpa_s->mac_addr_rand_enable & MAC_ADDR_RAND_PNO) {
2437 params.mac_addr_rand = 1;
2438 if (wpa_s->mac_addr_pno) {
2439 params.mac_addr = wpa_s->mac_addr_pno;
2440 params.mac_addr_mask = wpa_s->mac_addr_pno + ETH_ALEN;
2441 }
2442 }
2443
2444 ret = wpa_supplicant_start_sched_scan(wpa_s, &params);
2445 os_free(params.filter_ssids);
2446 if (ret == 0)
2447 wpa_s->pno = 1;
2448 else
2449 wpa_msg(wpa_s, MSG_ERROR, "Failed to schedule PNO");
2450 return ret;
2451 }
2452
2453
2454 int wpas_stop_pno(struct wpa_supplicant *wpa_s)
2455 {
2456 int ret = 0;
2457
2458 if (!wpa_s->pno)
2459 return 0;
2460
2461 ret = wpa_supplicant_stop_sched_scan(wpa_s);
2462
2463 wpa_s->pno = 0;
2464 wpa_s->pno_sched_pending = 0;
2465
2466 if (wpa_s->wpa_state == WPA_SCANNING)
2467 wpa_supplicant_req_scan(wpa_s, 0, 0);
2468
2469 return ret;
2470 }
2471
2472
2473 void wpas_mac_addr_rand_scan_clear(struct wpa_supplicant *wpa_s,
2474 unsigned int type)
2475 {
2476 type &= MAC_ADDR_RAND_ALL;
2477 wpa_s->mac_addr_rand_enable &= ~type;
2478
2479 if (type & MAC_ADDR_RAND_SCAN) {
2480 os_free(wpa_s->mac_addr_scan);
2481 wpa_s->mac_addr_scan = NULL;
2482 }
2483
2484 if (type & MAC_ADDR_RAND_SCHED_SCAN) {
2485 os_free(wpa_s->mac_addr_sched_scan);
2486 wpa_s->mac_addr_sched_scan = NULL;
2487 }
2488
2489 if (type & MAC_ADDR_RAND_PNO) {
2490 os_free(wpa_s->mac_addr_pno);
2491 wpa_s->mac_addr_pno = NULL;
2492 }
2493 }
2494
2495
2496 int wpas_mac_addr_rand_scan_set(struct wpa_supplicant *wpa_s,
2497 unsigned int type, const u8 *addr,
2498 const u8 *mask)
2499 {
2500 u8 *tmp = NULL;
2501
2502 wpas_mac_addr_rand_scan_clear(wpa_s, type);
2503
2504 if (addr) {
2505 tmp = os_malloc(2 * ETH_ALEN);
2506 if (!tmp)
2507 return -1;
2508 os_memcpy(tmp, addr, ETH_ALEN);
2509 os_memcpy(tmp + ETH_ALEN, mask, ETH_ALEN);
2510 }
2511
2512 if (type == MAC_ADDR_RAND_SCAN) {
2513 wpa_s->mac_addr_scan = tmp;
2514 } else if (type == MAC_ADDR_RAND_SCHED_SCAN) {
2515 wpa_s->mac_addr_sched_scan = tmp;
2516 } else if (type == MAC_ADDR_RAND_PNO) {
2517 wpa_s->mac_addr_pno = tmp;
2518 } else {
2519 wpa_printf(MSG_INFO,
2520 "scan: Invalid MAC randomization type=0x%x",
2521 type);
2522 os_free(tmp);
2523 return -1;
2524 }
2525
2526 wpa_s->mac_addr_rand_enable |= type;
2527 return 0;
2528 }
2529
2530
2531 int wpas_abort_ongoing_scan(struct wpa_supplicant *wpa_s)
2532 {
2533 if (wpa_s->scan_work && wpa_s->own_scan_running) {
2534 wpa_dbg(wpa_s, MSG_DEBUG, "Abort an ongoing scan");
2535 return wpa_drv_abort_scan(wpa_s);
2536 }
2537
2538 return 0;
2539 }
2540
2541
2542 int wpas_sched_scan_plans_set(struct wpa_supplicant *wpa_s, const char *cmd)
2543 {
2544 struct sched_scan_plan *scan_plans = NULL;
2545 const char *token, *context = NULL;
2546 unsigned int num = 0;
2547
2548 if (!cmd)
2549 return -1;
2550
2551 while ((token = cstr_token(cmd, " ", &context))) {
2552 int ret;
2553 struct sched_scan_plan *scan_plan, *n;
2554
2555 n = os_realloc_array(scan_plans, num + 1, sizeof(*scan_plans));
2556 if (!n)
2557 goto fail;
2558
2559 scan_plans = n;
2560 scan_plan = &scan_plans[num];
2561 num++;
2562
2563 ret = sscanf(token, "%u:%u", &scan_plan->interval,
2564 &scan_plan->iterations);
2565 if (ret <= 0 || ret > 2 || !scan_plan->interval) {
2566 wpa_printf(MSG_ERROR,
2567 "Invalid sched scan plan input: %s", token);
2568 goto fail;
2569 }
2570
2571 if (!scan_plan->interval) {
2572 wpa_printf(MSG_ERROR,
2573 "scan plan %u: Interval cannot be zero",
2574 num);
2575 goto fail;
2576 }
2577
2578 if (scan_plan->interval > wpa_s->max_sched_scan_plan_interval) {
2579 wpa_printf(MSG_WARNING,
2580 "scan plan %u: Scan interval too long(%u), use the maximum allowed(%u)",
2581 num, scan_plan->interval,
2582 wpa_s->max_sched_scan_plan_interval);
2583 scan_plan->interval =
2584 wpa_s->max_sched_scan_plan_interval;
2585 }
2586
2587 if (ret == 1) {
2588 scan_plan->iterations = 0;
2589 break;
2590 }
2591
2592 if (!scan_plan->iterations) {
2593 wpa_printf(MSG_ERROR,
2594 "scan plan %u: Number of iterations cannot be zero",
2595 num);
2596 goto fail;
2597 }
2598
2599 if (scan_plan->iterations >
2600 wpa_s->max_sched_scan_plan_iterations) {
2601 wpa_printf(MSG_WARNING,
2602 "scan plan %u: Too many iterations(%u), use the maximum allowed(%u)",
2603 num, scan_plan->iterations,
2604 wpa_s->max_sched_scan_plan_iterations);
2605 scan_plan->iterations =
2606 wpa_s->max_sched_scan_plan_iterations;
2607 }
2608
2609 wpa_printf(MSG_DEBUG,
2610 "scan plan %u: interval=%u iterations=%u",
2611 num, scan_plan->interval, scan_plan->iterations);
2612 }
2613
2614 if (!scan_plans) {
2615 wpa_printf(MSG_ERROR, "Invalid scan plans entry");
2616 goto fail;
2617 }
2618
2619 if (cstr_token(cmd, " ", &context) || scan_plans[num - 1].iterations) {
2620 wpa_printf(MSG_ERROR,
2621 "All scan plans but the last must specify a number of iterations");
2622 goto fail;
2623 }
2624
2625 wpa_printf(MSG_DEBUG, "scan plan %u (last plan): interval=%u",
2626 num, scan_plans[num - 1].interval);
2627
2628 if (num > wpa_s->max_sched_scan_plans) {
2629 wpa_printf(MSG_WARNING,
2630 "Too many scheduled scan plans (only %u supported)",
2631 wpa_s->max_sched_scan_plans);
2632 wpa_printf(MSG_WARNING,
2633 "Use only the first %u scan plans, and the last one (in infinite loop)",
2634 wpa_s->max_sched_scan_plans - 1);
2635 os_memcpy(&scan_plans[wpa_s->max_sched_scan_plans - 1],
2636 &scan_plans[num - 1], sizeof(*scan_plans));
2637 num = wpa_s->max_sched_scan_plans;
2638 }
2639
2640 os_free(wpa_s->sched_scan_plans);
2641 wpa_s->sched_scan_plans = scan_plans;
2642 wpa_s->sched_scan_plans_num = num;
2643
2644 return 0;
2645
2646 fail:
2647 os_free(scan_plans);
2648 wpa_printf(MSG_ERROR, "invalid scan plans list");
2649 return -1;
2650 }
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