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Remove dead code from wpas_sched_scan_plans_set()
[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 wpas_notify_network_changed(wpa_s);
40 }
41 wpa_supplicant_initiate_eapol(wpa_s);
42 wpa_dbg(wpa_s, MSG_DEBUG, "Already associated with a configured "
43 "network - generating associated event");
44 os_memset(&data, 0, sizeof(data));
45 wpa_supplicant_event(wpa_s, EVENT_ASSOC, &data);
46 }
47
48
49 #ifdef CONFIG_WPS
50 static int wpas_wps_in_use(struct wpa_supplicant *wpa_s,
51 enum wps_request_type *req_type)
52 {
53 struct wpa_ssid *ssid;
54 int wps = 0;
55
56 for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
57 if (!(ssid->key_mgmt & WPA_KEY_MGMT_WPS))
58 continue;
59
60 wps = 1;
61 *req_type = wpas_wps_get_req_type(ssid);
62 if (ssid->eap.phase1 && os_strstr(ssid->eap.phase1, "pbc=1"))
63 return 2;
64 }
65
66 #ifdef CONFIG_P2P
67 if (!wpa_s->global->p2p_disabled && wpa_s->global->p2p &&
68 !wpa_s->conf->p2p_disabled) {
69 wpa_s->wps->dev.p2p = 1;
70 if (!wps) {
71 wps = 1;
72 *req_type = WPS_REQ_ENROLLEE_INFO;
73 }
74 }
75 #endif /* CONFIG_P2P */
76
77 return wps;
78 }
79 #endif /* CONFIG_WPS */
80
81
82 /**
83 * wpa_supplicant_enabled_networks - Check whether there are enabled networks
84 * @wpa_s: Pointer to wpa_supplicant data
85 * Returns: 0 if no networks are enabled, >0 if networks are enabled
86 *
87 * This function is used to figure out whether any networks (or Interworking
88 * with enabled credentials and auto_interworking) are present in the current
89 * configuration.
90 */
91 int wpa_supplicant_enabled_networks(struct wpa_supplicant *wpa_s)
92 {
93 struct wpa_ssid *ssid = wpa_s->conf->ssid;
94 int count = 0, disabled = 0;
95
96 if (wpa_s->p2p_mgmt)
97 return 0; /* no normal network profiles on p2p_mgmt interface */
98
99 while (ssid) {
100 if (!wpas_network_disabled(wpa_s, ssid))
101 count++;
102 else
103 disabled++;
104 ssid = ssid->next;
105 }
106 if (wpa_s->conf->cred && wpa_s->conf->interworking &&
107 wpa_s->conf->auto_interworking)
108 count++;
109 if (count == 0 && disabled > 0) {
110 wpa_dbg(wpa_s, MSG_DEBUG, "No enabled networks (%d disabled "
111 "networks)", disabled);
112 }
113 return count;
114 }
115
116
117 static void wpa_supplicant_assoc_try(struct wpa_supplicant *wpa_s,
118 struct wpa_ssid *ssid)
119 {
120 while (ssid) {
121 if (!wpas_network_disabled(wpa_s, ssid))
122 break;
123 ssid = ssid->next;
124 }
125
126 /* ap_scan=2 mode - try to associate with each SSID. */
127 if (ssid == NULL) {
128 wpa_dbg(wpa_s, MSG_DEBUG, "wpa_supplicant_assoc_try: Reached "
129 "end of scan list - go back to beginning");
130 wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
131 wpa_supplicant_req_scan(wpa_s, 0, 0);
132 return;
133 }
134 if (ssid->next) {
135 /* Continue from the next SSID on the next attempt. */
136 wpa_s->prev_scan_ssid = ssid;
137 } else {
138 /* Start from the beginning of the SSID list. */
139 wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
140 }
141 wpa_supplicant_associate(wpa_s, NULL, ssid);
142 }
143
144
145 static void wpas_trigger_scan_cb(struct wpa_radio_work *work, int deinit)
146 {
147 struct wpa_supplicant *wpa_s = work->wpa_s;
148 struct wpa_driver_scan_params *params = work->ctx;
149 int ret;
150
151 if (deinit) {
152 if (!work->started) {
153 wpa_scan_free_params(params);
154 return;
155 }
156 wpa_supplicant_notify_scanning(wpa_s, 0);
157 wpas_notify_scan_done(wpa_s, 0);
158 wpa_s->scan_work = NULL;
159 return;
160 }
161
162 if (wpas_update_random_addr_disassoc(wpa_s) < 0) {
163 wpa_msg(wpa_s, MSG_INFO,
164 "Failed to assign random MAC address for a scan");
165 wpa_scan_free_params(params);
166 wpa_msg(wpa_s, MSG_INFO, WPA_EVENT_SCAN_FAILED "ret=-1");
167 radio_work_done(work);
168 return;
169 }
170
171 wpa_supplicant_notify_scanning(wpa_s, 1);
172
173 if (wpa_s->clear_driver_scan_cache) {
174 wpa_printf(MSG_DEBUG,
175 "Request driver to clear scan cache due to local BSS flush");
176 params->only_new_results = 1;
177 }
178 ret = wpa_drv_scan(wpa_s, params);
179 wpa_scan_free_params(params);
180 work->ctx = NULL;
181 if (ret) {
182 int retry = wpa_s->last_scan_req != MANUAL_SCAN_REQ;
183
184 if (wpa_s->disconnected)
185 retry = 0;
186
187 wpa_supplicant_notify_scanning(wpa_s, 0);
188 wpas_notify_scan_done(wpa_s, 0);
189 if (wpa_s->wpa_state == WPA_SCANNING)
190 wpa_supplicant_set_state(wpa_s,
191 wpa_s->scan_prev_wpa_state);
192 wpa_msg(wpa_s, MSG_INFO, WPA_EVENT_SCAN_FAILED "ret=%d%s",
193 ret, retry ? " retry=1" : "");
194 radio_work_done(work);
195
196 if (retry) {
197 /* Restore scan_req since we will try to scan again */
198 wpa_s->scan_req = wpa_s->last_scan_req;
199 wpa_supplicant_req_scan(wpa_s, 1, 0);
200 }
201 return;
202 }
203
204 os_get_reltime(&wpa_s->scan_trigger_time);
205 wpa_s->scan_runs++;
206 wpa_s->normal_scans++;
207 wpa_s->own_scan_requested = 1;
208 wpa_s->clear_driver_scan_cache = 0;
209 wpa_s->scan_work = work;
210 }
211
212
213 /**
214 * wpa_supplicant_trigger_scan - Request driver to start a scan
215 * @wpa_s: Pointer to wpa_supplicant data
216 * @params: Scan parameters
217 * Returns: 0 on success, -1 on failure
218 */
219 int wpa_supplicant_trigger_scan(struct wpa_supplicant *wpa_s,
220 struct wpa_driver_scan_params *params)
221 {
222 struct wpa_driver_scan_params *ctx;
223
224 if (wpa_s->scan_work) {
225 wpa_dbg(wpa_s, MSG_INFO, "Reject scan trigger since one is already pending");
226 return -1;
227 }
228
229 ctx = wpa_scan_clone_params(params);
230 if (!ctx ||
231 radio_add_work(wpa_s, 0, "scan", 0, wpas_trigger_scan_cb, ctx) < 0)
232 {
233 wpa_scan_free_params(ctx);
234 wpa_msg(wpa_s, MSG_INFO, WPA_EVENT_SCAN_FAILED "ret=-1");
235 return -1;
236 }
237
238 return 0;
239 }
240
241
242 static void
243 wpa_supplicant_delayed_sched_scan_timeout(void *eloop_ctx, void *timeout_ctx)
244 {
245 struct wpa_supplicant *wpa_s = eloop_ctx;
246
247 wpa_dbg(wpa_s, MSG_DEBUG, "Starting delayed sched scan");
248
249 if (wpa_supplicant_req_sched_scan(wpa_s))
250 wpa_supplicant_req_scan(wpa_s, 0, 0);
251 }
252
253
254 static void
255 wpa_supplicant_sched_scan_timeout(void *eloop_ctx, void *timeout_ctx)
256 {
257 struct wpa_supplicant *wpa_s = eloop_ctx;
258
259 wpa_dbg(wpa_s, MSG_DEBUG, "Sched scan timeout - stopping it");
260
261 wpa_s->sched_scan_timed_out = 1;
262 wpa_supplicant_cancel_sched_scan(wpa_s);
263 }
264
265
266 static int
267 wpa_supplicant_start_sched_scan(struct wpa_supplicant *wpa_s,
268 struct wpa_driver_scan_params *params)
269 {
270 int ret;
271
272 wpa_supplicant_notify_scanning(wpa_s, 1);
273 ret = wpa_drv_sched_scan(wpa_s, params);
274 if (ret)
275 wpa_supplicant_notify_scanning(wpa_s, 0);
276 else
277 wpa_s->sched_scanning = 1;
278
279 return ret;
280 }
281
282
283 static int wpa_supplicant_stop_sched_scan(struct wpa_supplicant *wpa_s)
284 {
285 int ret;
286
287 ret = wpa_drv_stop_sched_scan(wpa_s);
288 if (ret) {
289 wpa_dbg(wpa_s, MSG_DEBUG, "stopping sched_scan failed!");
290 /* TODO: what to do if stopping fails? */
291 return -1;
292 }
293
294 return ret;
295 }
296
297
298 static struct wpa_driver_scan_filter *
299 wpa_supplicant_build_filter_ssids(struct wpa_config *conf, size_t *num_ssids)
300 {
301 struct wpa_driver_scan_filter *ssids;
302 struct wpa_ssid *ssid;
303 size_t count;
304
305 *num_ssids = 0;
306 if (!conf->filter_ssids)
307 return NULL;
308
309 for (count = 0, ssid = conf->ssid; ssid; ssid = ssid->next) {
310 if (ssid->ssid && ssid->ssid_len)
311 count++;
312 }
313 if (count == 0)
314 return NULL;
315 ssids = os_calloc(count, sizeof(struct wpa_driver_scan_filter));
316 if (ssids == NULL)
317 return NULL;
318
319 for (ssid = conf->ssid; ssid; ssid = ssid->next) {
320 if (!ssid->ssid || !ssid->ssid_len)
321 continue;
322 os_memcpy(ssids[*num_ssids].ssid, ssid->ssid, ssid->ssid_len);
323 ssids[*num_ssids].ssid_len = ssid->ssid_len;
324 (*num_ssids)++;
325 }
326
327 return ssids;
328 }
329
330
331 static void wpa_supplicant_optimize_freqs(
332 struct wpa_supplicant *wpa_s, struct wpa_driver_scan_params *params)
333 {
334 #ifdef CONFIG_P2P
335 if (params->freqs == NULL && wpa_s->p2p_in_provisioning &&
336 wpa_s->go_params) {
337 /* Optimize provisioning state scan based on GO information */
338 if (wpa_s->p2p_in_provisioning < 5 &&
339 wpa_s->go_params->freq > 0) {
340 wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only GO "
341 "preferred frequency %d MHz",
342 wpa_s->go_params->freq);
343 params->freqs = os_calloc(2, sizeof(int));
344 if (params->freqs)
345 params->freqs[0] = wpa_s->go_params->freq;
346 } else if (wpa_s->p2p_in_provisioning < 8 &&
347 wpa_s->go_params->freq_list[0]) {
348 wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only common "
349 "channels");
350 int_array_concat(&params->freqs,
351 wpa_s->go_params->freq_list);
352 if (params->freqs)
353 int_array_sort_unique(params->freqs);
354 }
355 wpa_s->p2p_in_provisioning++;
356 }
357
358 if (params->freqs == NULL && wpa_s->p2p_in_invitation) {
359 /*
360 * Optimize scan based on GO information during persistent
361 * group reinvocation
362 */
363 if (wpa_s->p2p_in_invitation < 5 &&
364 wpa_s->p2p_invite_go_freq > 0) {
365 wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only GO preferred frequency %d MHz during invitation",
366 wpa_s->p2p_invite_go_freq);
367 params->freqs = os_calloc(2, sizeof(int));
368 if (params->freqs)
369 params->freqs[0] = wpa_s->p2p_invite_go_freq;
370 }
371 wpa_s->p2p_in_invitation++;
372 if (wpa_s->p2p_in_invitation > 20) {
373 /*
374 * This should not really happen since the variable is
375 * cleared on group removal, but if it does happen, make
376 * sure we do not get stuck in special invitation scan
377 * mode.
378 */
379 wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Clear p2p_in_invitation");
380 wpa_s->p2p_in_invitation = 0;
381 }
382 }
383 #endif /* CONFIG_P2P */
384
385 #ifdef CONFIG_WPS
386 if (params->freqs == NULL && wpa_s->after_wps && wpa_s->wps_freq) {
387 /*
388 * Optimize post-provisioning scan based on channel used
389 * during provisioning.
390 */
391 wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Scan only frequency %u MHz "
392 "that was used during provisioning", wpa_s->wps_freq);
393 params->freqs = os_calloc(2, sizeof(int));
394 if (params->freqs)
395 params->freqs[0] = wpa_s->wps_freq;
396 wpa_s->after_wps--;
397 } else if (wpa_s->after_wps)
398 wpa_s->after_wps--;
399
400 if (params->freqs == NULL && wpa_s->known_wps_freq && wpa_s->wps_freq)
401 {
402 /* Optimize provisioning scan based on already known channel */
403 wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Scan only frequency %u MHz",
404 wpa_s->wps_freq);
405 params->freqs = os_calloc(2, sizeof(int));
406 if (params->freqs)
407 params->freqs[0] = wpa_s->wps_freq;
408 wpa_s->known_wps_freq = 0; /* only do this once */
409 }
410 #endif /* CONFIG_WPS */
411 }
412
413
414 #ifdef CONFIG_INTERWORKING
415 static void wpas_add_interworking_elements(struct wpa_supplicant *wpa_s,
416 struct wpabuf *buf)
417 {
418 wpabuf_put_u8(buf, WLAN_EID_INTERWORKING);
419 wpabuf_put_u8(buf, is_zero_ether_addr(wpa_s->conf->hessid) ? 1 :
420 1 + ETH_ALEN);
421 wpabuf_put_u8(buf, wpa_s->conf->access_network_type);
422 /* No Venue Info */
423 if (!is_zero_ether_addr(wpa_s->conf->hessid))
424 wpabuf_put_data(buf, wpa_s->conf->hessid, ETH_ALEN);
425 }
426 #endif /* CONFIG_INTERWORKING */
427
428
429 static struct wpabuf * wpa_supplicant_extra_ies(struct wpa_supplicant *wpa_s)
430 {
431 struct wpabuf *extra_ie = NULL;
432 u8 ext_capab[18];
433 int ext_capab_len;
434 #ifdef CONFIG_WPS
435 int wps = 0;
436 enum wps_request_type req_type = WPS_REQ_ENROLLEE_INFO;
437 #endif /* CONFIG_WPS */
438
439 ext_capab_len = wpas_build_ext_capab(wpa_s, ext_capab,
440 sizeof(ext_capab));
441 if (ext_capab_len > 0 &&
442 wpabuf_resize(&extra_ie, ext_capab_len) == 0)
443 wpabuf_put_data(extra_ie, ext_capab, ext_capab_len);
444
445 #ifdef CONFIG_INTERWORKING
446 if (wpa_s->conf->interworking &&
447 wpabuf_resize(&extra_ie, 100) == 0)
448 wpas_add_interworking_elements(wpa_s, extra_ie);
449 #endif /* CONFIG_INTERWORKING */
450
451 #ifdef CONFIG_WPS
452 wps = wpas_wps_in_use(wpa_s, &req_type);
453
454 if (wps) {
455 struct wpabuf *wps_ie;
456 wps_ie = wps_build_probe_req_ie(wps == 2 ? DEV_PW_PUSHBUTTON :
457 DEV_PW_DEFAULT,
458 &wpa_s->wps->dev,
459 wpa_s->wps->uuid, req_type,
460 0, NULL);
461 if (wps_ie) {
462 if (wpabuf_resize(&extra_ie, wpabuf_len(wps_ie)) == 0)
463 wpabuf_put_buf(extra_ie, wps_ie);
464 wpabuf_free(wps_ie);
465 }
466 }
467
468 #ifdef CONFIG_P2P
469 if (wps) {
470 size_t ielen = p2p_scan_ie_buf_len(wpa_s->global->p2p);
471 if (wpabuf_resize(&extra_ie, ielen) == 0)
472 wpas_p2p_scan_ie(wpa_s, extra_ie);
473 }
474 #endif /* CONFIG_P2P */
475
476 wpa_supplicant_mesh_add_scan_ie(wpa_s, &extra_ie);
477
478 #endif /* CONFIG_WPS */
479
480 #ifdef CONFIG_HS20
481 if (wpa_s->conf->hs20 && wpabuf_resize(&extra_ie, 7) == 0)
482 wpas_hs20_add_indication(extra_ie, -1);
483 #endif /* CONFIG_HS20 */
484
485 #ifdef CONFIG_FST
486 if (wpa_s->fst_ies &&
487 wpabuf_resize(&extra_ie, wpabuf_len(wpa_s->fst_ies)) == 0)
488 wpabuf_put_buf(extra_ie, wpa_s->fst_ies);
489 #endif /* CONFIG_FST */
490
491 #ifdef CONFIG_MBO
492 /* Send cellular capabilities for potential MBO STAs */
493 if (wpabuf_resize(&extra_ie, 9) == 0)
494 wpas_mbo_scan_ie(wpa_s, extra_ie);
495 #endif /* CONFIG_MBO */
496
497 if (wpa_s->vendor_elem[VENDOR_ELEM_PROBE_REQ]) {
498 struct wpabuf *buf = wpa_s->vendor_elem[VENDOR_ELEM_PROBE_REQ];
499
500 if (wpabuf_resize(&extra_ie, wpabuf_len(buf)) == 0)
501 wpabuf_put_buf(extra_ie, buf);
502 }
503
504 return extra_ie;
505 }
506
507
508 #ifdef CONFIG_P2P
509
510 /*
511 * Check whether there are any enabled networks or credentials that could be
512 * used for a non-P2P connection.
513 */
514 static int non_p2p_network_enabled(struct wpa_supplicant *wpa_s)
515 {
516 struct wpa_ssid *ssid;
517
518 for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
519 if (wpas_network_disabled(wpa_s, ssid))
520 continue;
521 if (!ssid->p2p_group)
522 return 1;
523 }
524
525 if (wpa_s->conf->cred && wpa_s->conf->interworking &&
526 wpa_s->conf->auto_interworking)
527 return 1;
528
529 return 0;
530 }
531
532 #endif /* CONFIG_P2P */
533
534
535 static void wpa_setband_scan_freqs_list(struct wpa_supplicant *wpa_s,
536 enum hostapd_hw_mode band,
537 struct wpa_driver_scan_params *params)
538 {
539 /* Include only supported channels for the specified band */
540 struct hostapd_hw_modes *mode;
541 int count, i;
542
543 mode = get_mode(wpa_s->hw.modes, wpa_s->hw.num_modes, band);
544 if (mode == NULL) {
545 /* No channels supported in this band - use empty list */
546 params->freqs = os_zalloc(sizeof(int));
547 return;
548 }
549
550 params->freqs = os_calloc(mode->num_channels + 1, sizeof(int));
551 if (params->freqs == NULL)
552 return;
553 for (count = 0, i = 0; i < mode->num_channels; i++) {
554 if (mode->channels[i].flag & HOSTAPD_CHAN_DISABLED)
555 continue;
556 params->freqs[count++] = mode->channels[i].freq;
557 }
558 }
559
560
561 static void wpa_setband_scan_freqs(struct wpa_supplicant *wpa_s,
562 struct wpa_driver_scan_params *params)
563 {
564 if (wpa_s->hw.modes == NULL)
565 return; /* unknown what channels the driver supports */
566 if (params->freqs)
567 return; /* already using a limited channel set */
568 if (wpa_s->setband == WPA_SETBAND_5G)
569 wpa_setband_scan_freqs_list(wpa_s, HOSTAPD_MODE_IEEE80211A,
570 params);
571 else if (wpa_s->setband == WPA_SETBAND_2G)
572 wpa_setband_scan_freqs_list(wpa_s, HOSTAPD_MODE_IEEE80211G,
573 params);
574 }
575
576
577 static void wpa_set_scan_ssids(struct wpa_supplicant *wpa_s,
578 struct wpa_driver_scan_params *params,
579 size_t max_ssids)
580 {
581 unsigned int i;
582 struct wpa_ssid *ssid;
583
584 for (i = 0; i < wpa_s->scan_id_count; i++) {
585 unsigned int j;
586
587 ssid = wpa_config_get_network(wpa_s->conf, wpa_s->scan_id[i]);
588 if (!ssid || !ssid->scan_ssid)
589 continue;
590
591 for (j = 0; j < params->num_ssids; j++) {
592 if (params->ssids[j].ssid_len == ssid->ssid_len &&
593 params->ssids[j].ssid &&
594 os_memcmp(params->ssids[j].ssid, ssid->ssid,
595 ssid->ssid_len) == 0)
596 break;
597 }
598 if (j < params->num_ssids)
599 continue; /* already in the list */
600
601 if (params->num_ssids + 1 > max_ssids) {
602 wpa_printf(MSG_DEBUG,
603 "Over max scan SSIDs for manual request");
604 break;
605 }
606
607 wpa_printf(MSG_DEBUG, "Scan SSID (manual request): %s",
608 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
609 params->ssids[params->num_ssids].ssid = ssid->ssid;
610 params->ssids[params->num_ssids].ssid_len = ssid->ssid_len;
611 params->num_ssids++;
612 }
613
614 wpa_s->scan_id_count = 0;
615 }
616
617
618 static int wpa_set_ssids_from_scan_req(struct wpa_supplicant *wpa_s,
619 struct wpa_driver_scan_params *params,
620 size_t max_ssids)
621 {
622 unsigned int i;
623
624 if (wpa_s->ssids_from_scan_req == NULL ||
625 wpa_s->num_ssids_from_scan_req == 0)
626 return 0;
627
628 if (wpa_s->num_ssids_from_scan_req > max_ssids) {
629 wpa_s->num_ssids_from_scan_req = max_ssids;
630 wpa_printf(MSG_DEBUG, "Over max scan SSIDs from scan req: %u",
631 (unsigned int) max_ssids);
632 }
633
634 for (i = 0; i < wpa_s->num_ssids_from_scan_req; i++) {
635 params->ssids[i].ssid = wpa_s->ssids_from_scan_req[i].ssid;
636 params->ssids[i].ssid_len =
637 wpa_s->ssids_from_scan_req[i].ssid_len;
638 wpa_hexdump_ascii(MSG_DEBUG, "specific SSID",
639 params->ssids[i].ssid,
640 params->ssids[i].ssid_len);
641 }
642
643 params->num_ssids = wpa_s->num_ssids_from_scan_req;
644 wpa_s->num_ssids_from_scan_req = 0;
645 return 1;
646 }
647
648
649 static void wpa_supplicant_scan(void *eloop_ctx, void *timeout_ctx)
650 {
651 struct wpa_supplicant *wpa_s = eloop_ctx;
652 struct wpa_ssid *ssid;
653 int ret, p2p_in_prog;
654 struct wpabuf *extra_ie = NULL;
655 struct wpa_driver_scan_params params;
656 struct wpa_driver_scan_params *scan_params;
657 size_t max_ssids;
658 int connect_without_scan = 0;
659
660 if (wpa_s->pno || wpa_s->pno_sched_pending) {
661 wpa_dbg(wpa_s, MSG_DEBUG, "Skip scan - PNO is in progress");
662 return;
663 }
664
665 if (wpa_s->wpa_state == WPA_INTERFACE_DISABLED) {
666 wpa_dbg(wpa_s, MSG_DEBUG, "Skip scan - interface disabled");
667 return;
668 }
669
670 if (wpa_s->disconnected && wpa_s->scan_req == NORMAL_SCAN_REQ) {
671 wpa_dbg(wpa_s, MSG_DEBUG, "Disconnected - do not scan");
672 wpa_supplicant_set_state(wpa_s, WPA_DISCONNECTED);
673 return;
674 }
675
676 if (wpa_s->scanning) {
677 /*
678 * If we are already in scanning state, we shall reschedule the
679 * the incoming scan request.
680 */
681 wpa_dbg(wpa_s, MSG_DEBUG, "Already scanning - Reschedule the incoming scan req");
682 wpa_supplicant_req_scan(wpa_s, 1, 0);
683 return;
684 }
685
686 if (!wpa_supplicant_enabled_networks(wpa_s) &&
687 wpa_s->scan_req == NORMAL_SCAN_REQ) {
688 wpa_dbg(wpa_s, MSG_DEBUG, "No enabled networks - do not scan");
689 wpa_supplicant_set_state(wpa_s, WPA_INACTIVE);
690 return;
691 }
692
693 if (wpa_s->conf->ap_scan != 0 &&
694 (wpa_s->drv_flags & WPA_DRIVER_FLAGS_WIRED)) {
695 wpa_dbg(wpa_s, MSG_DEBUG, "Using wired authentication - "
696 "overriding ap_scan configuration");
697 wpa_s->conf->ap_scan = 0;
698 wpas_notify_ap_scan_changed(wpa_s);
699 }
700
701 if (wpa_s->conf->ap_scan == 0) {
702 wpa_supplicant_gen_assoc_event(wpa_s);
703 return;
704 }
705
706 ssid = NULL;
707 if (wpa_s->scan_req != MANUAL_SCAN_REQ &&
708 wpa_s->connect_without_scan) {
709 connect_without_scan = 1;
710 for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
711 if (ssid == wpa_s->connect_without_scan)
712 break;
713 }
714 }
715
716 p2p_in_prog = wpas_p2p_in_progress(wpa_s);
717 if (p2p_in_prog && p2p_in_prog != 2 &&
718 (!ssid ||
719 (ssid->mode != WPAS_MODE_AP && ssid->mode != WPAS_MODE_P2P_GO))) {
720 wpa_dbg(wpa_s, MSG_DEBUG, "Delay station mode scan while P2P operation is in progress");
721 wpa_supplicant_req_scan(wpa_s, 5, 0);
722 return;
723 }
724
725 if (wpa_s->conf->ap_scan == 2)
726 max_ssids = 1;
727 else {
728 max_ssids = wpa_s->max_scan_ssids;
729 if (max_ssids > WPAS_MAX_SCAN_SSIDS)
730 max_ssids = WPAS_MAX_SCAN_SSIDS;
731 }
732
733 wpa_s->last_scan_req = wpa_s->scan_req;
734 wpa_s->scan_req = NORMAL_SCAN_REQ;
735
736 if (connect_without_scan) {
737 wpa_s->connect_without_scan = NULL;
738 if (ssid) {
739 wpa_printf(MSG_DEBUG, "Start a pre-selected network "
740 "without scan step");
741 wpa_supplicant_associate(wpa_s, NULL, ssid);
742 return;
743 }
744 }
745
746 os_memset(&params, 0, sizeof(params));
747
748 wpa_s->scan_prev_wpa_state = wpa_s->wpa_state;
749 if (wpa_s->wpa_state == WPA_DISCONNECTED ||
750 wpa_s->wpa_state == WPA_INACTIVE)
751 wpa_supplicant_set_state(wpa_s, WPA_SCANNING);
752
753 /*
754 * If autoscan has set its own scanning parameters
755 */
756 if (wpa_s->autoscan_params != NULL) {
757 scan_params = wpa_s->autoscan_params;
758 goto scan;
759 }
760
761 if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
762 wpa_set_ssids_from_scan_req(wpa_s, &params, max_ssids)) {
763 wpa_printf(MSG_DEBUG, "Use specific SSIDs from SCAN command");
764 goto ssid_list_set;
765 }
766
767 #ifdef CONFIG_P2P
768 if ((wpa_s->p2p_in_provisioning || wpa_s->show_group_started) &&
769 wpa_s->go_params && !wpa_s->conf->passive_scan) {
770 wpa_printf(MSG_DEBUG, "P2P: Use specific SSID for scan during P2P group formation (p2p_in_provisioning=%d show_group_started=%d)",
771 wpa_s->p2p_in_provisioning,
772 wpa_s->show_group_started);
773 params.ssids[0].ssid = wpa_s->go_params->ssid;
774 params.ssids[0].ssid_len = wpa_s->go_params->ssid_len;
775 params.num_ssids = 1;
776 goto ssid_list_set;
777 }
778
779 if (wpa_s->p2p_in_invitation) {
780 if (wpa_s->current_ssid) {
781 wpa_printf(MSG_DEBUG, "P2P: Use specific SSID for scan during invitation");
782 params.ssids[0].ssid = wpa_s->current_ssid->ssid;
783 params.ssids[0].ssid_len =
784 wpa_s->current_ssid->ssid_len;
785 params.num_ssids = 1;
786 } else {
787 wpa_printf(MSG_DEBUG, "P2P: No specific SSID known for scan during invitation");
788 }
789 goto ssid_list_set;
790 }
791 #endif /* CONFIG_P2P */
792
793 /* Find the starting point from which to continue scanning */
794 ssid = wpa_s->conf->ssid;
795 if (wpa_s->prev_scan_ssid != WILDCARD_SSID_SCAN) {
796 while (ssid) {
797 if (ssid == wpa_s->prev_scan_ssid) {
798 ssid = ssid->next;
799 break;
800 }
801 ssid = ssid->next;
802 }
803 }
804
805 if (wpa_s->last_scan_req != MANUAL_SCAN_REQ &&
806 #ifdef CONFIG_AP
807 !wpa_s->ap_iface &&
808 #endif /* CONFIG_AP */
809 wpa_s->conf->ap_scan == 2) {
810 wpa_s->connect_without_scan = NULL;
811 wpa_s->prev_scan_wildcard = 0;
812 wpa_supplicant_assoc_try(wpa_s, ssid);
813 return;
814 } else if (wpa_s->conf->ap_scan == 2) {
815 /*
816 * User-initiated scan request in ap_scan == 2; scan with
817 * wildcard SSID.
818 */
819 ssid = NULL;
820 } else if (wpa_s->reattach && wpa_s->current_ssid != NULL) {
821 /*
822 * Perform single-channel single-SSID scan for
823 * reassociate-to-same-BSS operation.
824 */
825 /* Setup SSID */
826 ssid = wpa_s->current_ssid;
827 wpa_hexdump_ascii(MSG_DEBUG, "Scan SSID",
828 ssid->ssid, ssid->ssid_len);
829 params.ssids[0].ssid = ssid->ssid;
830 params.ssids[0].ssid_len = ssid->ssid_len;
831 params.num_ssids = 1;
832
833 /*
834 * Allocate memory for frequency array, allocate one extra
835 * slot for the zero-terminator.
836 */
837 params.freqs = os_malloc(sizeof(int) * 2);
838 if (params.freqs) {
839 params.freqs[0] = wpa_s->assoc_freq;
840 params.freqs[1] = 0;
841 }
842
843 /*
844 * Reset the reattach flag so that we fall back to full scan if
845 * this scan fails.
846 */
847 wpa_s->reattach = 0;
848 } else {
849 struct wpa_ssid *start = ssid, *tssid;
850 int freqs_set = 0;
851 if (ssid == NULL && max_ssids > 1)
852 ssid = wpa_s->conf->ssid;
853 while (ssid) {
854 if (!wpas_network_disabled(wpa_s, ssid) &&
855 ssid->scan_ssid) {
856 wpa_hexdump_ascii(MSG_DEBUG, "Scan SSID",
857 ssid->ssid, ssid->ssid_len);
858 params.ssids[params.num_ssids].ssid =
859 ssid->ssid;
860 params.ssids[params.num_ssids].ssid_len =
861 ssid->ssid_len;
862 params.num_ssids++;
863 if (params.num_ssids + 1 >= max_ssids)
864 break;
865 }
866 ssid = ssid->next;
867 if (ssid == start)
868 break;
869 if (ssid == NULL && max_ssids > 1 &&
870 start != wpa_s->conf->ssid)
871 ssid = wpa_s->conf->ssid;
872 }
873
874 if (wpa_s->scan_id_count &&
875 wpa_s->last_scan_req == MANUAL_SCAN_REQ)
876 wpa_set_scan_ssids(wpa_s, &params, max_ssids);
877
878 for (tssid = wpa_s->conf->ssid;
879 wpa_s->last_scan_req != MANUAL_SCAN_REQ && tssid;
880 tssid = tssid->next) {
881 if (wpas_network_disabled(wpa_s, tssid))
882 continue;
883 if ((params.freqs || !freqs_set) && tssid->scan_freq) {
884 int_array_concat(&params.freqs,
885 tssid->scan_freq);
886 } else {
887 os_free(params.freqs);
888 params.freqs = NULL;
889 }
890 freqs_set = 1;
891 }
892 int_array_sort_unique(params.freqs);
893 }
894
895 if (ssid && max_ssids == 1) {
896 /*
897 * If the driver is limited to 1 SSID at a time interleave
898 * wildcard SSID scans with specific SSID scans to avoid
899 * waiting a long time for a wildcard scan.
900 */
901 if (!wpa_s->prev_scan_wildcard) {
902 params.ssids[0].ssid = NULL;
903 params.ssids[0].ssid_len = 0;
904 wpa_s->prev_scan_wildcard = 1;
905 wpa_dbg(wpa_s, MSG_DEBUG, "Starting AP scan for "
906 "wildcard SSID (Interleave with specific)");
907 } else {
908 wpa_s->prev_scan_ssid = ssid;
909 wpa_s->prev_scan_wildcard = 0;
910 wpa_dbg(wpa_s, MSG_DEBUG,
911 "Starting AP scan for specific SSID: %s",
912 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
913 }
914 } else if (ssid) {
915 /* max_ssids > 1 */
916
917 wpa_s->prev_scan_ssid = ssid;
918 wpa_dbg(wpa_s, MSG_DEBUG, "Include wildcard SSID in "
919 "the scan request");
920 params.num_ssids++;
921 } else if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
922 wpa_s->manual_scan_passive && params.num_ssids == 0) {
923 wpa_dbg(wpa_s, MSG_DEBUG, "Use passive scan based on manual request");
924 } else if (wpa_s->conf->passive_scan) {
925 wpa_dbg(wpa_s, MSG_DEBUG,
926 "Use passive scan based on configuration");
927 } else {
928 wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
929 params.num_ssids++;
930 wpa_dbg(wpa_s, MSG_DEBUG, "Starting AP scan for wildcard "
931 "SSID");
932 }
933
934 ssid_list_set:
935 wpa_supplicant_optimize_freqs(wpa_s, &params);
936 extra_ie = wpa_supplicant_extra_ies(wpa_s);
937
938 if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
939 wpa_s->manual_scan_only_new) {
940 wpa_printf(MSG_DEBUG,
941 "Request driver to clear scan cache due to manual only_new=1 scan");
942 params.only_new_results = 1;
943 }
944
945 if (wpa_s->last_scan_req == MANUAL_SCAN_REQ && params.freqs == NULL &&
946 wpa_s->manual_scan_freqs) {
947 wpa_dbg(wpa_s, MSG_DEBUG, "Limit manual scan to specified channels");
948 params.freqs = wpa_s->manual_scan_freqs;
949 wpa_s->manual_scan_freqs = NULL;
950 }
951
952 if (params.freqs == NULL && wpa_s->next_scan_freqs) {
953 wpa_dbg(wpa_s, MSG_DEBUG, "Optimize scan based on previously "
954 "generated frequency list");
955 params.freqs = wpa_s->next_scan_freqs;
956 } else
957 os_free(wpa_s->next_scan_freqs);
958 wpa_s->next_scan_freqs = NULL;
959 wpa_setband_scan_freqs(wpa_s, &params);
960
961 /* See if user specified frequencies. If so, scan only those. */
962 if (wpa_s->conf->freq_list && !params.freqs) {
963 wpa_dbg(wpa_s, MSG_DEBUG,
964 "Optimize scan based on conf->freq_list");
965 int_array_concat(&params.freqs, wpa_s->conf->freq_list);
966 }
967
968 /* Use current associated channel? */
969 if (wpa_s->conf->scan_cur_freq && !params.freqs) {
970 unsigned int num = wpa_s->num_multichan_concurrent;
971
972 params.freqs = os_calloc(num + 1, sizeof(int));
973 if (params.freqs) {
974 num = get_shared_radio_freqs(wpa_s, params.freqs, num);
975 if (num > 0) {
976 wpa_dbg(wpa_s, MSG_DEBUG, "Scan only the "
977 "current operating channels since "
978 "scan_cur_freq is enabled");
979 } else {
980 os_free(params.freqs);
981 params.freqs = NULL;
982 }
983 }
984 }
985
986 params.filter_ssids = wpa_supplicant_build_filter_ssids(
987 wpa_s->conf, &params.num_filter_ssids);
988 if (extra_ie) {
989 params.extra_ies = wpabuf_head(extra_ie);
990 params.extra_ies_len = wpabuf_len(extra_ie);
991 }
992
993 #ifdef CONFIG_P2P
994 if (wpa_s->p2p_in_provisioning || wpa_s->p2p_in_invitation ||
995 (wpa_s->show_group_started && wpa_s->go_params)) {
996 /*
997 * The interface may not yet be in P2P mode, so we have to
998 * explicitly request P2P probe to disable CCK rates.
999 */
1000 params.p2p_probe = 1;
1001 }
1002 #endif /* CONFIG_P2P */
1003
1004 if (wpa_s->mac_addr_rand_enable & MAC_ADDR_RAND_SCAN) {
1005 params.mac_addr_rand = 1;
1006 if (wpa_s->mac_addr_scan) {
1007 params.mac_addr = wpa_s->mac_addr_scan;
1008 params.mac_addr_mask = wpa_s->mac_addr_scan + ETH_ALEN;
1009 }
1010 }
1011
1012 if (!is_zero_ether_addr(wpa_s->next_scan_bssid)) {
1013 struct wpa_bss *bss;
1014
1015 params.bssid = wpa_s->next_scan_bssid;
1016 bss = wpa_bss_get_bssid_latest(wpa_s, params.bssid);
1017 if (bss && bss->ssid_len && params.num_ssids == 1 &&
1018 params.ssids[0].ssid_len == 0) {
1019 params.ssids[0].ssid = bss->ssid;
1020 params.ssids[0].ssid_len = bss->ssid_len;
1021 wpa_dbg(wpa_s, MSG_DEBUG,
1022 "Scan a previously specified BSSID " MACSTR
1023 " and SSID %s",
1024 MAC2STR(params.bssid),
1025 wpa_ssid_txt(bss->ssid, bss->ssid_len));
1026 } else {
1027 wpa_dbg(wpa_s, MSG_DEBUG,
1028 "Scan a previously specified BSSID " MACSTR,
1029 MAC2STR(params.bssid));
1030 }
1031 }
1032
1033 scan_params = &params;
1034
1035 scan:
1036 #ifdef CONFIG_P2P
1037 /*
1038 * If the driver does not support multi-channel concurrency and a
1039 * virtual interface that shares the same radio with the wpa_s interface
1040 * is operating there may not be need to scan other channels apart from
1041 * the current operating channel on the other virtual interface. Filter
1042 * out other channels in case we are trying to find a connection for a
1043 * station interface when we are not configured to prefer station
1044 * connection and a concurrent operation is already in process.
1045 */
1046 if (wpa_s->scan_for_connection &&
1047 wpa_s->last_scan_req == NORMAL_SCAN_REQ &&
1048 !scan_params->freqs && !params.freqs &&
1049 wpas_is_p2p_prioritized(wpa_s) &&
1050 wpa_s->p2p_group_interface == NOT_P2P_GROUP_INTERFACE &&
1051 non_p2p_network_enabled(wpa_s)) {
1052 unsigned int num = wpa_s->num_multichan_concurrent;
1053
1054 params.freqs = os_calloc(num + 1, sizeof(int));
1055 if (params.freqs) {
1056 num = get_shared_radio_freqs(wpa_s, params.freqs, num);
1057 if (num > 0 && num == wpa_s->num_multichan_concurrent) {
1058 wpa_dbg(wpa_s, MSG_DEBUG, "Scan only the current operating channels since all channels are already used");
1059 } else {
1060 os_free(params.freqs);
1061 params.freqs = NULL;
1062 }
1063 }
1064 }
1065 #endif /* CONFIG_P2P */
1066
1067 ret = wpa_supplicant_trigger_scan(wpa_s, scan_params);
1068
1069 if (ret && wpa_s->last_scan_req == MANUAL_SCAN_REQ && params.freqs &&
1070 !wpa_s->manual_scan_freqs) {
1071 /* Restore manual_scan_freqs for the next attempt */
1072 wpa_s->manual_scan_freqs = params.freqs;
1073 params.freqs = NULL;
1074 }
1075
1076 wpabuf_free(extra_ie);
1077 os_free(params.freqs);
1078 os_free(params.filter_ssids);
1079
1080 if (ret) {
1081 wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate AP scan");
1082 if (wpa_s->scan_prev_wpa_state != wpa_s->wpa_state)
1083 wpa_supplicant_set_state(wpa_s,
1084 wpa_s->scan_prev_wpa_state);
1085 /* Restore scan_req since we will try to scan again */
1086 wpa_s->scan_req = wpa_s->last_scan_req;
1087 wpa_supplicant_req_scan(wpa_s, 1, 0);
1088 } else {
1089 wpa_s->scan_for_connection = 0;
1090 #ifdef CONFIG_INTERWORKING
1091 wpa_s->interworking_fast_assoc_tried = 0;
1092 #endif /* CONFIG_INTERWORKING */
1093 if (params.bssid)
1094 os_memset(wpa_s->next_scan_bssid, 0, ETH_ALEN);
1095 }
1096 }
1097
1098
1099 void wpa_supplicant_update_scan_int(struct wpa_supplicant *wpa_s, int sec)
1100 {
1101 struct os_reltime remaining, new_int;
1102 int cancelled;
1103
1104 cancelled = eloop_cancel_timeout_one(wpa_supplicant_scan, wpa_s, NULL,
1105 &remaining);
1106
1107 new_int.sec = sec;
1108 new_int.usec = 0;
1109 if (cancelled && os_reltime_before(&remaining, &new_int)) {
1110 new_int.sec = remaining.sec;
1111 new_int.usec = remaining.usec;
1112 }
1113
1114 if (cancelled) {
1115 eloop_register_timeout(new_int.sec, new_int.usec,
1116 wpa_supplicant_scan, wpa_s, NULL);
1117 }
1118 wpa_s->scan_interval = sec;
1119 }
1120
1121
1122 /**
1123 * wpa_supplicant_req_scan - Schedule a scan for neighboring access points
1124 * @wpa_s: Pointer to wpa_supplicant data
1125 * @sec: Number of seconds after which to scan
1126 * @usec: Number of microseconds after which to scan
1127 *
1128 * This function is used to schedule a scan for neighboring access points after
1129 * the specified time.
1130 */
1131 void wpa_supplicant_req_scan(struct wpa_supplicant *wpa_s, int sec, int usec)
1132 {
1133 int res;
1134
1135 if (wpa_s->p2p_mgmt) {
1136 wpa_dbg(wpa_s, MSG_DEBUG,
1137 "Ignore scan request (%d.%06d sec) on p2p_mgmt interface",
1138 sec, usec);
1139 return;
1140 }
1141
1142 res = eloop_deplete_timeout(sec, usec, wpa_supplicant_scan, wpa_s,
1143 NULL);
1144 if (res == 1) {
1145 wpa_dbg(wpa_s, MSG_DEBUG, "Rescheduling scan request: %d.%06d sec",
1146 sec, usec);
1147 } else if (res == 0) {
1148 wpa_dbg(wpa_s, MSG_DEBUG, "Ignore new scan request for %d.%06d sec since an earlier request is scheduled to trigger sooner",
1149 sec, usec);
1150 } else {
1151 wpa_dbg(wpa_s, MSG_DEBUG, "Setting scan request: %d.%06d sec",
1152 sec, usec);
1153 eloop_register_timeout(sec, usec, wpa_supplicant_scan, wpa_s, NULL);
1154 }
1155 }
1156
1157
1158 /**
1159 * wpa_supplicant_delayed_sched_scan - Request a delayed scheduled scan
1160 * @wpa_s: Pointer to wpa_supplicant data
1161 * @sec: Number of seconds after which to scan
1162 * @usec: Number of microseconds after which to scan
1163 * Returns: 0 on success or -1 otherwise
1164 *
1165 * This function is used to schedule periodic scans for neighboring
1166 * access points after the specified time.
1167 */
1168 int wpa_supplicant_delayed_sched_scan(struct wpa_supplicant *wpa_s,
1169 int sec, int usec)
1170 {
1171 if (!wpa_s->sched_scan_supported)
1172 return -1;
1173
1174 eloop_register_timeout(sec, usec,
1175 wpa_supplicant_delayed_sched_scan_timeout,
1176 wpa_s, NULL);
1177
1178 return 0;
1179 }
1180
1181
1182 /**
1183 * wpa_supplicant_req_sched_scan - Start a periodic scheduled scan
1184 * @wpa_s: Pointer to wpa_supplicant data
1185 * Returns: 0 is sched_scan was started or -1 otherwise
1186 *
1187 * This function is used to schedule periodic scans for neighboring
1188 * access points repeating the scan continuously.
1189 */
1190 int wpa_supplicant_req_sched_scan(struct wpa_supplicant *wpa_s)
1191 {
1192 struct wpa_driver_scan_params params;
1193 struct wpa_driver_scan_params *scan_params;
1194 enum wpa_states prev_state;
1195 struct wpa_ssid *ssid = NULL;
1196 struct wpabuf *extra_ie = NULL;
1197 int ret;
1198 unsigned int max_sched_scan_ssids;
1199 int wildcard = 0;
1200 int need_ssids;
1201 struct sched_scan_plan scan_plan;
1202
1203 if (!wpa_s->sched_scan_supported)
1204 return -1;
1205
1206 if (wpa_s->max_sched_scan_ssids > WPAS_MAX_SCAN_SSIDS)
1207 max_sched_scan_ssids = WPAS_MAX_SCAN_SSIDS;
1208 else
1209 max_sched_scan_ssids = wpa_s->max_sched_scan_ssids;
1210 if (max_sched_scan_ssids < 1 || wpa_s->conf->disable_scan_offload)
1211 return -1;
1212
1213 if (wpa_s->sched_scanning) {
1214 wpa_dbg(wpa_s, MSG_DEBUG, "Already sched scanning");
1215 return 0;
1216 }
1217
1218 need_ssids = 0;
1219 for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
1220 if (!wpas_network_disabled(wpa_s, ssid) && !ssid->scan_ssid) {
1221 /* Use wildcard SSID to find this network */
1222 wildcard = 1;
1223 } else if (!wpas_network_disabled(wpa_s, ssid) &&
1224 ssid->ssid_len)
1225 need_ssids++;
1226
1227 #ifdef CONFIG_WPS
1228 if (!wpas_network_disabled(wpa_s, ssid) &&
1229 ssid->key_mgmt == WPA_KEY_MGMT_WPS) {
1230 /*
1231 * Normal scan is more reliable and faster for WPS
1232 * operations and since these are for short periods of
1233 * time, the benefit of trying to use sched_scan would
1234 * be limited.
1235 */
1236 wpa_dbg(wpa_s, MSG_DEBUG, "Use normal scan instead of "
1237 "sched_scan for WPS");
1238 return -1;
1239 }
1240 #endif /* CONFIG_WPS */
1241 }
1242 if (wildcard)
1243 need_ssids++;
1244
1245 if (wpa_s->normal_scans < 3 &&
1246 (need_ssids <= wpa_s->max_scan_ssids ||
1247 wpa_s->max_scan_ssids >= (int) max_sched_scan_ssids)) {
1248 /*
1249 * When normal scan can speed up operations, use that for the
1250 * first operations before starting the sched_scan to allow
1251 * user space sleep more. We do this only if the normal scan
1252 * has functionality that is suitable for this or if the
1253 * sched_scan does not have better support for multiple SSIDs.
1254 */
1255 wpa_dbg(wpa_s, MSG_DEBUG, "Use normal scan instead of "
1256 "sched_scan for initial scans (normal_scans=%d)",
1257 wpa_s->normal_scans);
1258 return -1;
1259 }
1260
1261 os_memset(&params, 0, sizeof(params));
1262
1263 /* If we can't allocate space for the filters, we just don't filter */
1264 params.filter_ssids = os_calloc(wpa_s->max_match_sets,
1265 sizeof(struct wpa_driver_scan_filter));
1266
1267 prev_state = wpa_s->wpa_state;
1268 if (wpa_s->wpa_state == WPA_DISCONNECTED ||
1269 wpa_s->wpa_state == WPA_INACTIVE)
1270 wpa_supplicant_set_state(wpa_s, WPA_SCANNING);
1271
1272 if (wpa_s->autoscan_params != NULL) {
1273 scan_params = wpa_s->autoscan_params;
1274 goto scan;
1275 }
1276
1277 /* Find the starting point from which to continue scanning */
1278 ssid = wpa_s->conf->ssid;
1279 if (wpa_s->prev_sched_ssid) {
1280 while (ssid) {
1281 if (ssid == wpa_s->prev_sched_ssid) {
1282 ssid = ssid->next;
1283 break;
1284 }
1285 ssid = ssid->next;
1286 }
1287 }
1288
1289 if (!ssid || !wpa_s->prev_sched_ssid) {
1290 wpa_dbg(wpa_s, MSG_DEBUG, "Beginning of SSID list");
1291 wpa_s->sched_scan_timeout = max_sched_scan_ssids * 2;
1292 wpa_s->first_sched_scan = 1;
1293 ssid = wpa_s->conf->ssid;
1294 wpa_s->prev_sched_ssid = ssid;
1295 }
1296
1297 if (wildcard) {
1298 wpa_dbg(wpa_s, MSG_DEBUG, "Add wildcard SSID to sched_scan");
1299 params.num_ssids++;
1300 }
1301
1302 while (ssid) {
1303 if (wpas_network_disabled(wpa_s, ssid))
1304 goto next;
1305
1306 if (params.num_filter_ssids < wpa_s->max_match_sets &&
1307 params.filter_ssids && ssid->ssid && ssid->ssid_len) {
1308 wpa_dbg(wpa_s, MSG_DEBUG, "add to filter ssid: %s",
1309 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
1310 os_memcpy(params.filter_ssids[params.num_filter_ssids].ssid,
1311 ssid->ssid, ssid->ssid_len);
1312 params.filter_ssids[params.num_filter_ssids].ssid_len =
1313 ssid->ssid_len;
1314 params.num_filter_ssids++;
1315 } else if (params.filter_ssids && ssid->ssid && ssid->ssid_len)
1316 {
1317 wpa_dbg(wpa_s, MSG_DEBUG, "Not enough room for SSID "
1318 "filter for sched_scan - drop filter");
1319 os_free(params.filter_ssids);
1320 params.filter_ssids = NULL;
1321 params.num_filter_ssids = 0;
1322 }
1323
1324 if (ssid->scan_ssid && ssid->ssid && ssid->ssid_len) {
1325 if (params.num_ssids == max_sched_scan_ssids)
1326 break; /* only room for broadcast SSID */
1327 wpa_dbg(wpa_s, MSG_DEBUG,
1328 "add to active scan ssid: %s",
1329 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
1330 params.ssids[params.num_ssids].ssid =
1331 ssid->ssid;
1332 params.ssids[params.num_ssids].ssid_len =
1333 ssid->ssid_len;
1334 params.num_ssids++;
1335 if (params.num_ssids >= max_sched_scan_ssids) {
1336 wpa_s->prev_sched_ssid = ssid;
1337 do {
1338 ssid = ssid->next;
1339 } while (ssid &&
1340 (wpas_network_disabled(wpa_s, ssid) ||
1341 !ssid->scan_ssid));
1342 break;
1343 }
1344 }
1345
1346 next:
1347 wpa_s->prev_sched_ssid = ssid;
1348 ssid = ssid->next;
1349 }
1350
1351 if (params.num_filter_ssids == 0) {
1352 os_free(params.filter_ssids);
1353 params.filter_ssids = NULL;
1354 }
1355
1356 extra_ie = wpa_supplicant_extra_ies(wpa_s);
1357 if (extra_ie) {
1358 params.extra_ies = wpabuf_head(extra_ie);
1359 params.extra_ies_len = wpabuf_len(extra_ie);
1360 }
1361
1362 if (wpa_s->conf->filter_rssi)
1363 params.filter_rssi = wpa_s->conf->filter_rssi;
1364
1365 /* See if user specified frequencies. If so, scan only those. */
1366 if (wpa_s->conf->freq_list && !params.freqs) {
1367 wpa_dbg(wpa_s, MSG_DEBUG,
1368 "Optimize scan based on conf->freq_list");
1369 int_array_concat(&params.freqs, wpa_s->conf->freq_list);
1370 }
1371
1372 scan_params = &params;
1373
1374 scan:
1375 wpa_s->sched_scan_timed_out = 0;
1376
1377 /*
1378 * We cannot support multiple scan plans if the scan request includes
1379 * too many SSID's, so in this case use only the last scan plan and make
1380 * it run infinitely. It will be stopped by the timeout.
1381 */
1382 if (wpa_s->sched_scan_plans_num == 1 ||
1383 (wpa_s->sched_scan_plans_num && !ssid && wpa_s->first_sched_scan)) {
1384 params.sched_scan_plans = wpa_s->sched_scan_plans;
1385 params.sched_scan_plans_num = wpa_s->sched_scan_plans_num;
1386 } else if (wpa_s->sched_scan_plans_num > 1) {
1387 wpa_dbg(wpa_s, MSG_DEBUG,
1388 "Too many SSIDs. Default to using single scheduled_scan plan");
1389 params.sched_scan_plans =
1390 &wpa_s->sched_scan_plans[wpa_s->sched_scan_plans_num -
1391 1];
1392 params.sched_scan_plans_num = 1;
1393 } else {
1394 if (wpa_s->conf->sched_scan_interval)
1395 scan_plan.interval = wpa_s->conf->sched_scan_interval;
1396 else
1397 scan_plan.interval = 10;
1398
1399 if (scan_plan.interval > wpa_s->max_sched_scan_plan_interval) {
1400 wpa_printf(MSG_WARNING,
1401 "Scan interval too long(%u), use the maximum allowed(%u)",
1402 scan_plan.interval,
1403 wpa_s->max_sched_scan_plan_interval);
1404 scan_plan.interval =
1405 wpa_s->max_sched_scan_plan_interval;
1406 }
1407
1408 scan_plan.iterations = 0;
1409 params.sched_scan_plans = &scan_plan;
1410 params.sched_scan_plans_num = 1;
1411 }
1412
1413 if (ssid || !wpa_s->first_sched_scan) {
1414 wpa_dbg(wpa_s, MSG_DEBUG,
1415 "Starting sched scan: interval %u timeout %d",
1416 params.sched_scan_plans[0].interval,
1417 wpa_s->sched_scan_timeout);
1418 } else {
1419 wpa_dbg(wpa_s, MSG_DEBUG, "Starting sched scan (no timeout)");
1420 }
1421
1422 wpa_setband_scan_freqs(wpa_s, scan_params);
1423
1424 if (wpa_s->mac_addr_rand_enable & MAC_ADDR_RAND_SCHED_SCAN) {
1425 params.mac_addr_rand = 1;
1426 if (wpa_s->mac_addr_sched_scan) {
1427 params.mac_addr = wpa_s->mac_addr_sched_scan;
1428 params.mac_addr_mask = wpa_s->mac_addr_sched_scan +
1429 ETH_ALEN;
1430 }
1431 }
1432
1433 ret = wpa_supplicant_start_sched_scan(wpa_s, scan_params);
1434 wpabuf_free(extra_ie);
1435 os_free(params.filter_ssids);
1436 if (ret) {
1437 wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate sched scan");
1438 if (prev_state != wpa_s->wpa_state)
1439 wpa_supplicant_set_state(wpa_s, prev_state);
1440 return ret;
1441 }
1442
1443 /* If we have more SSIDs to scan, add a timeout so we scan them too */
1444 if (ssid || !wpa_s->first_sched_scan) {
1445 wpa_s->sched_scan_timed_out = 0;
1446 eloop_register_timeout(wpa_s->sched_scan_timeout, 0,
1447 wpa_supplicant_sched_scan_timeout,
1448 wpa_s, NULL);
1449 wpa_s->first_sched_scan = 0;
1450 wpa_s->sched_scan_timeout /= 2;
1451 params.sched_scan_plans[0].interval *= 2;
1452 if ((unsigned int) wpa_s->sched_scan_timeout <
1453 params.sched_scan_plans[0].interval ||
1454 params.sched_scan_plans[0].interval >
1455 wpa_s->max_sched_scan_plan_interval) {
1456 params.sched_scan_plans[0].interval = 10;
1457 wpa_s->sched_scan_timeout = max_sched_scan_ssids * 2;
1458 }
1459 }
1460
1461 /* If there is no more ssids, start next time from the beginning */
1462 if (!ssid)
1463 wpa_s->prev_sched_ssid = NULL;
1464
1465 return 0;
1466 }
1467
1468
1469 /**
1470 * wpa_supplicant_cancel_scan - Cancel a scheduled scan request
1471 * @wpa_s: Pointer to wpa_supplicant data
1472 *
1473 * This function is used to cancel a scan request scheduled with
1474 * wpa_supplicant_req_scan().
1475 */
1476 void wpa_supplicant_cancel_scan(struct wpa_supplicant *wpa_s)
1477 {
1478 wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling scan request");
1479 eloop_cancel_timeout(wpa_supplicant_scan, wpa_s, NULL);
1480 }
1481
1482
1483 /**
1484 * wpa_supplicant_cancel_delayed_sched_scan - Stop a delayed scheduled scan
1485 * @wpa_s: Pointer to wpa_supplicant data
1486 *
1487 * This function is used to stop a delayed scheduled scan.
1488 */
1489 void wpa_supplicant_cancel_delayed_sched_scan(struct wpa_supplicant *wpa_s)
1490 {
1491 if (!wpa_s->sched_scan_supported)
1492 return;
1493
1494 wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling delayed sched scan");
1495 eloop_cancel_timeout(wpa_supplicant_delayed_sched_scan_timeout,
1496 wpa_s, NULL);
1497 }
1498
1499
1500 /**
1501 * wpa_supplicant_cancel_sched_scan - Stop running scheduled scans
1502 * @wpa_s: Pointer to wpa_supplicant data
1503 *
1504 * This function is used to stop a periodic scheduled scan.
1505 */
1506 void wpa_supplicant_cancel_sched_scan(struct wpa_supplicant *wpa_s)
1507 {
1508 if (!wpa_s->sched_scanning)
1509 return;
1510
1511 wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling sched scan");
1512 eloop_cancel_timeout(wpa_supplicant_sched_scan_timeout, wpa_s, NULL);
1513 wpa_supplicant_stop_sched_scan(wpa_s);
1514 }
1515
1516
1517 /**
1518 * wpa_supplicant_notify_scanning - Indicate possible scan state change
1519 * @wpa_s: Pointer to wpa_supplicant data
1520 * @scanning: Whether scanning is currently in progress
1521 *
1522 * This function is to generate scanning notifycations. It is called whenever
1523 * there may have been a change in scanning (scan started, completed, stopped).
1524 * wpas_notify_scanning() is called whenever the scanning state changed from the
1525 * previously notified state.
1526 */
1527 void wpa_supplicant_notify_scanning(struct wpa_supplicant *wpa_s,
1528 int scanning)
1529 {
1530 if (wpa_s->scanning != scanning) {
1531 wpa_s->scanning = scanning;
1532 wpas_notify_scanning(wpa_s);
1533 }
1534 }
1535
1536
1537 static int wpa_scan_get_max_rate(const struct wpa_scan_res *res)
1538 {
1539 int rate = 0;
1540 const u8 *ie;
1541 int i;
1542
1543 ie = wpa_scan_get_ie(res, WLAN_EID_SUPP_RATES);
1544 for (i = 0; ie && i < ie[1]; i++) {
1545 if ((ie[i + 2] & 0x7f) > rate)
1546 rate = ie[i + 2] & 0x7f;
1547 }
1548
1549 ie = wpa_scan_get_ie(res, WLAN_EID_EXT_SUPP_RATES);
1550 for (i = 0; ie && i < ie[1]; i++) {
1551 if ((ie[i + 2] & 0x7f) > rate)
1552 rate = ie[i + 2] & 0x7f;
1553 }
1554
1555 return rate;
1556 }
1557
1558
1559 /**
1560 * wpa_scan_get_ie - Fetch a specified information element from a scan result
1561 * @res: Scan result entry
1562 * @ie: Information element identitifier (WLAN_EID_*)
1563 * Returns: Pointer to the information element (id field) or %NULL if not found
1564 *
1565 * This function returns the first matching information element in the scan
1566 * result.
1567 */
1568 const u8 * wpa_scan_get_ie(const struct wpa_scan_res *res, u8 ie)
1569 {
1570 return get_ie((const u8 *) (res + 1), res->ie_len, ie);
1571 }
1572
1573
1574 /**
1575 * wpa_scan_get_vendor_ie - Fetch vendor information element from a scan result
1576 * @res: Scan result entry
1577 * @vendor_type: Vendor type (four octets starting the IE payload)
1578 * Returns: Pointer to the information element (id field) or %NULL if not found
1579 *
1580 * This function returns the first matching information element in the scan
1581 * result.
1582 */
1583 const u8 * wpa_scan_get_vendor_ie(const struct wpa_scan_res *res,
1584 u32 vendor_type)
1585 {
1586 const u8 *end, *pos;
1587
1588 pos = (const u8 *) (res + 1);
1589 end = pos + res->ie_len;
1590
1591 while (end - pos > 1) {
1592 if (2 + pos[1] > end - pos)
1593 break;
1594 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1595 vendor_type == WPA_GET_BE32(&pos[2]))
1596 return pos;
1597 pos += 2 + pos[1];
1598 }
1599
1600 return NULL;
1601 }
1602
1603
1604 /**
1605 * wpa_scan_get_vendor_ie_beacon - Fetch vendor information from a scan result
1606 * @res: Scan result entry
1607 * @vendor_type: Vendor type (four octets starting the IE payload)
1608 * Returns: Pointer to the information element (id field) or %NULL if not found
1609 *
1610 * This function returns the first matching information element in the scan
1611 * result.
1612 *
1613 * This function is like wpa_scan_get_vendor_ie(), but uses IE buffer only
1614 * from Beacon frames instead of either Beacon or Probe Response frames.
1615 */
1616 const u8 * wpa_scan_get_vendor_ie_beacon(const struct wpa_scan_res *res,
1617 u32 vendor_type)
1618 {
1619 const u8 *end, *pos;
1620
1621 if (res->beacon_ie_len == 0)
1622 return NULL;
1623
1624 pos = (const u8 *) (res + 1);
1625 pos += res->ie_len;
1626 end = pos + res->beacon_ie_len;
1627
1628 while (end - pos > 1) {
1629 if (2 + pos[1] > end - pos)
1630 break;
1631 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1632 vendor_type == WPA_GET_BE32(&pos[2]))
1633 return pos;
1634 pos += 2 + pos[1];
1635 }
1636
1637 return NULL;
1638 }
1639
1640
1641 /**
1642 * wpa_scan_get_vendor_ie_multi - Fetch vendor IE data from a scan result
1643 * @res: Scan result entry
1644 * @vendor_type: Vendor type (four octets starting the IE payload)
1645 * Returns: Pointer to the information element payload or %NULL if not found
1646 *
1647 * This function returns concatenated payload of possibly fragmented vendor
1648 * specific information elements in the scan result. The caller is responsible
1649 * for freeing the returned buffer.
1650 */
1651 struct wpabuf * wpa_scan_get_vendor_ie_multi(const struct wpa_scan_res *res,
1652 u32 vendor_type)
1653 {
1654 struct wpabuf *buf;
1655 const u8 *end, *pos;
1656
1657 buf = wpabuf_alloc(res->ie_len);
1658 if (buf == NULL)
1659 return NULL;
1660
1661 pos = (const u8 *) (res + 1);
1662 end = pos + res->ie_len;
1663
1664 while (end - pos > 1) {
1665 if (2 + pos[1] > end - pos)
1666 break;
1667 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1668 vendor_type == WPA_GET_BE32(&pos[2]))
1669 wpabuf_put_data(buf, pos + 2 + 4, pos[1] - 4);
1670 pos += 2 + pos[1];
1671 }
1672
1673 if (wpabuf_len(buf) == 0) {
1674 wpabuf_free(buf);
1675 buf = NULL;
1676 }
1677
1678 return buf;
1679 }
1680
1681
1682 /*
1683 * Channels with a great SNR can operate at full rate. What is a great SNR?
1684 * This doc https://supportforums.cisco.com/docs/DOC-12954 says, "the general
1685 * rule of thumb is that any SNR above 20 is good." This one
1686 * http://www.cisco.com/en/US/tech/tk722/tk809/technologies_q_and_a_item09186a00805e9a96.shtml#qa23
1687 * recommends 25 as a minimum SNR for 54 Mbps data rate. 30 is chosen here as a
1688 * conservative value.
1689 */
1690 #define GREAT_SNR 30
1691
1692 #define IS_5GHZ(n) (n > 4000)
1693
1694 /* Compare function for sorting scan results. Return >0 if @b is considered
1695 * better. */
1696 static int wpa_scan_result_compar(const void *a, const void *b)
1697 {
1698 #define MIN(a,b) a < b ? a : b
1699 struct wpa_scan_res **_wa = (void *) a;
1700 struct wpa_scan_res **_wb = (void *) b;
1701 struct wpa_scan_res *wa = *_wa;
1702 struct wpa_scan_res *wb = *_wb;
1703 int wpa_a, wpa_b;
1704 int snr_a, snr_b, snr_a_full, snr_b_full;
1705
1706 /* WPA/WPA2 support preferred */
1707 wpa_a = wpa_scan_get_vendor_ie(wa, WPA_IE_VENDOR_TYPE) != NULL ||
1708 wpa_scan_get_ie(wa, WLAN_EID_RSN) != NULL;
1709 wpa_b = wpa_scan_get_vendor_ie(wb, WPA_IE_VENDOR_TYPE) != NULL ||
1710 wpa_scan_get_ie(wb, WLAN_EID_RSN) != NULL;
1711
1712 if (wpa_b && !wpa_a)
1713 return 1;
1714 if (!wpa_b && wpa_a)
1715 return -1;
1716
1717 /* privacy support preferred */
1718 if ((wa->caps & IEEE80211_CAP_PRIVACY) == 0 &&
1719 (wb->caps & IEEE80211_CAP_PRIVACY))
1720 return 1;
1721 if ((wa->caps & IEEE80211_CAP_PRIVACY) &&
1722 (wb->caps & IEEE80211_CAP_PRIVACY) == 0)
1723 return -1;
1724
1725 if (wa->flags & wb->flags & WPA_SCAN_LEVEL_DBM) {
1726 snr_a_full = wa->snr;
1727 snr_a = MIN(wa->snr, GREAT_SNR);
1728 snr_b_full = wb->snr;
1729 snr_b = MIN(wb->snr, GREAT_SNR);
1730 } else {
1731 /* Level is not in dBm, so we can't calculate
1732 * SNR. Just use raw level (units unknown). */
1733 snr_a = snr_a_full = wa->level;
1734 snr_b = snr_b_full = wb->level;
1735 }
1736
1737 /* if SNR is close, decide by max rate or frequency band */
1738 if ((snr_a && snr_b && abs(snr_b - snr_a) < 5) ||
1739 (wa->qual && wb->qual && abs(wb->qual - wa->qual) < 10)) {
1740 if (wa->est_throughput != wb->est_throughput)
1741 return wb->est_throughput - wa->est_throughput;
1742 if (IS_5GHZ(wa->freq) ^ IS_5GHZ(wb->freq))
1743 return IS_5GHZ(wa->freq) ? -1 : 1;
1744 }
1745
1746 /* all things being equal, use SNR; if SNRs are
1747 * identical, use quality values since some drivers may only report
1748 * that value and leave the signal level zero */
1749 if (snr_b_full == snr_a_full)
1750 return wb->qual - wa->qual;
1751 return snr_b_full - snr_a_full;
1752 #undef MIN
1753 }
1754
1755
1756 #ifdef CONFIG_WPS
1757 /* Compare function for sorting scan results when searching a WPS AP for
1758 * provisioning. Return >0 if @b is considered better. */
1759 static int wpa_scan_result_wps_compar(const void *a, const void *b)
1760 {
1761 struct wpa_scan_res **_wa = (void *) a;
1762 struct wpa_scan_res **_wb = (void *) b;
1763 struct wpa_scan_res *wa = *_wa;
1764 struct wpa_scan_res *wb = *_wb;
1765 int uses_wps_a, uses_wps_b;
1766 struct wpabuf *wps_a, *wps_b;
1767 int res;
1768
1769 /* Optimization - check WPS IE existence before allocated memory and
1770 * doing full reassembly. */
1771 uses_wps_a = wpa_scan_get_vendor_ie(wa, WPS_IE_VENDOR_TYPE) != NULL;
1772 uses_wps_b = wpa_scan_get_vendor_ie(wb, WPS_IE_VENDOR_TYPE) != NULL;
1773 if (uses_wps_a && !uses_wps_b)
1774 return -1;
1775 if (!uses_wps_a && uses_wps_b)
1776 return 1;
1777
1778 if (uses_wps_a && uses_wps_b) {
1779 wps_a = wpa_scan_get_vendor_ie_multi(wa, WPS_IE_VENDOR_TYPE);
1780 wps_b = wpa_scan_get_vendor_ie_multi(wb, WPS_IE_VENDOR_TYPE);
1781 res = wps_ap_priority_compar(wps_a, wps_b);
1782 wpabuf_free(wps_a);
1783 wpabuf_free(wps_b);
1784 if (res)
1785 return res;
1786 }
1787
1788 /*
1789 * Do not use current AP security policy as a sorting criteria during
1790 * WPS provisioning step since the AP may get reconfigured at the
1791 * completion of provisioning.
1792 */
1793
1794 /* all things being equal, use signal level; if signal levels are
1795 * identical, use quality values since some drivers may only report
1796 * that value and leave the signal level zero */
1797 if (wb->level == wa->level)
1798 return wb->qual - wa->qual;
1799 return wb->level - wa->level;
1800 }
1801 #endif /* CONFIG_WPS */
1802
1803
1804 static void dump_scan_res(struct wpa_scan_results *scan_res)
1805 {
1806 #ifndef CONFIG_NO_STDOUT_DEBUG
1807 size_t i;
1808
1809 if (scan_res->res == NULL || scan_res->num == 0)
1810 return;
1811
1812 wpa_printf(MSG_EXCESSIVE, "Sorted scan results");
1813
1814 for (i = 0; i < scan_res->num; i++) {
1815 struct wpa_scan_res *r = scan_res->res[i];
1816 u8 *pos;
1817 if (r->flags & WPA_SCAN_LEVEL_DBM) {
1818 int noise_valid = !(r->flags & WPA_SCAN_NOISE_INVALID);
1819
1820 wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d "
1821 "noise=%d%s level=%d snr=%d%s flags=0x%x age=%u est=%u",
1822 MAC2STR(r->bssid), r->freq, r->qual,
1823 r->noise, noise_valid ? "" : "~", r->level,
1824 r->snr, r->snr >= GREAT_SNR ? "*" : "",
1825 r->flags,
1826 r->age, r->est_throughput);
1827 } else {
1828 wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d "
1829 "noise=%d level=%d flags=0x%x age=%u est=%u",
1830 MAC2STR(r->bssid), r->freq, r->qual,
1831 r->noise, r->level, r->flags, r->age,
1832 r->est_throughput);
1833 }
1834 pos = (u8 *) (r + 1);
1835 if (r->ie_len)
1836 wpa_hexdump(MSG_EXCESSIVE, "IEs", pos, r->ie_len);
1837 pos += r->ie_len;
1838 if (r->beacon_ie_len)
1839 wpa_hexdump(MSG_EXCESSIVE, "Beacon IEs",
1840 pos, r->beacon_ie_len);
1841 }
1842 #endif /* CONFIG_NO_STDOUT_DEBUG */
1843 }
1844
1845
1846 /**
1847 * wpa_supplicant_filter_bssid_match - Is the specified BSSID allowed
1848 * @wpa_s: Pointer to wpa_supplicant data
1849 * @bssid: BSSID to check
1850 * Returns: 0 if the BSSID is filtered or 1 if not
1851 *
1852 * This function is used to filter out specific BSSIDs from scan reslts mainly
1853 * for testing purposes (SET bssid_filter ctrl_iface command).
1854 */
1855 int wpa_supplicant_filter_bssid_match(struct wpa_supplicant *wpa_s,
1856 const u8 *bssid)
1857 {
1858 size_t i;
1859
1860 if (wpa_s->bssid_filter == NULL)
1861 return 1;
1862
1863 for (i = 0; i < wpa_s->bssid_filter_count; i++) {
1864 if (os_memcmp(wpa_s->bssid_filter + i * ETH_ALEN, bssid,
1865 ETH_ALEN) == 0)
1866 return 1;
1867 }
1868
1869 return 0;
1870 }
1871
1872
1873 void filter_scan_res(struct wpa_supplicant *wpa_s,
1874 struct wpa_scan_results *res)
1875 {
1876 size_t i, j;
1877
1878 if (wpa_s->bssid_filter == NULL)
1879 return;
1880
1881 for (i = 0, j = 0; i < res->num; i++) {
1882 if (wpa_supplicant_filter_bssid_match(wpa_s,
1883 res->res[i]->bssid)) {
1884 res->res[j++] = res->res[i];
1885 } else {
1886 os_free(res->res[i]);
1887 res->res[i] = NULL;
1888 }
1889 }
1890
1891 if (res->num != j) {
1892 wpa_printf(MSG_DEBUG, "Filtered out %d scan results",
1893 (int) (res->num - j));
1894 res->num = j;
1895 }
1896 }
1897
1898
1899 /*
1900 * Noise floor values to use when we have signal strength
1901 * measurements, but no noise floor measurements. These values were
1902 * measured in an office environment with many APs.
1903 */
1904 #define DEFAULT_NOISE_FLOOR_2GHZ (-89)
1905 #define DEFAULT_NOISE_FLOOR_5GHZ (-92)
1906
1907 void scan_snr(struct wpa_scan_res *res)
1908 {
1909 if (res->flags & WPA_SCAN_NOISE_INVALID) {
1910 res->noise = IS_5GHZ(res->freq) ?
1911 DEFAULT_NOISE_FLOOR_5GHZ :
1912 DEFAULT_NOISE_FLOOR_2GHZ;
1913 }
1914
1915 if (res->flags & WPA_SCAN_LEVEL_DBM) {
1916 res->snr = res->level - res->noise;
1917 } else {
1918 /* Level is not in dBm, so we can't calculate
1919 * SNR. Just use raw level (units unknown). */
1920 res->snr = res->level;
1921 }
1922 }
1923
1924
1925 static unsigned int max_ht20_rate(int snr)
1926 {
1927 if (snr < 6)
1928 return 6500; /* HT20 MCS0 */
1929 if (snr < 8)
1930 return 13000; /* HT20 MCS1 */
1931 if (snr < 13)
1932 return 19500; /* HT20 MCS2 */
1933 if (snr < 17)
1934 return 26000; /* HT20 MCS3 */
1935 if (snr < 20)
1936 return 39000; /* HT20 MCS4 */
1937 if (snr < 23)
1938 return 52000; /* HT20 MCS5 */
1939 if (snr < 24)
1940 return 58500; /* HT20 MCS6 */
1941 return 65000; /* HT20 MCS7 */
1942 }
1943
1944
1945 static unsigned int max_ht40_rate(int snr)
1946 {
1947 if (snr < 3)
1948 return 13500; /* HT40 MCS0 */
1949 if (snr < 6)
1950 return 27000; /* HT40 MCS1 */
1951 if (snr < 10)
1952 return 40500; /* HT40 MCS2 */
1953 if (snr < 15)
1954 return 54000; /* HT40 MCS3 */
1955 if (snr < 17)
1956 return 81000; /* HT40 MCS4 */
1957 if (snr < 22)
1958 return 108000; /* HT40 MCS5 */
1959 if (snr < 24)
1960 return 121500; /* HT40 MCS6 */
1961 return 135000; /* HT40 MCS7 */
1962 }
1963
1964
1965 static unsigned int max_vht80_rate(int snr)
1966 {
1967 if (snr < 1)
1968 return 0;
1969 if (snr < 2)
1970 return 29300; /* VHT80 MCS0 */
1971 if (snr < 5)
1972 return 58500; /* VHT80 MCS1 */
1973 if (snr < 9)
1974 return 87800; /* VHT80 MCS2 */
1975 if (snr < 11)
1976 return 117000; /* VHT80 MCS3 */
1977 if (snr < 15)
1978 return 175500; /* VHT80 MCS4 */
1979 if (snr < 16)
1980 return 234000; /* VHT80 MCS5 */
1981 if (snr < 18)
1982 return 263300; /* VHT80 MCS6 */
1983 if (snr < 20)
1984 return 292500; /* VHT80 MCS7 */
1985 if (snr < 22)
1986 return 351000; /* VHT80 MCS8 */
1987 return 390000; /* VHT80 MCS9 */
1988 }
1989
1990
1991 void scan_est_throughput(struct wpa_supplicant *wpa_s,
1992 struct wpa_scan_res *res)
1993 {
1994 enum local_hw_capab capab = wpa_s->hw_capab;
1995 int rate; /* max legacy rate in 500 kb/s units */
1996 const u8 *ie;
1997 unsigned int est, tmp;
1998 int snr = res->snr;
1999
2000 if (res->est_throughput)
2001 return;
2002
2003 /* Get maximum legacy rate */
2004 rate = wpa_scan_get_max_rate(res);
2005
2006 /* Limit based on estimated SNR */
2007 if (rate > 1 * 2 && snr < 1)
2008 rate = 1 * 2;
2009 else if (rate > 2 * 2 && snr < 4)
2010 rate = 2 * 2;
2011 else if (rate > 6 * 2 && snr < 5)
2012 rate = 6 * 2;
2013 else if (rate > 9 * 2 && snr < 6)
2014 rate = 9 * 2;
2015 else if (rate > 12 * 2 && snr < 7)
2016 rate = 12 * 2;
2017 else if (rate > 18 * 2 && snr < 10)
2018 rate = 18 * 2;
2019 else if (rate > 24 * 2 && snr < 11)
2020 rate = 24 * 2;
2021 else if (rate > 36 * 2 && snr < 15)
2022 rate = 36 * 2;
2023 else if (rate > 48 * 2 && snr < 19)
2024 rate = 48 * 2;
2025 else if (rate > 54 * 2 && snr < 21)
2026 rate = 54 * 2;
2027 est = rate * 500;
2028
2029 if (capab == CAPAB_HT || capab == CAPAB_HT40 || capab == CAPAB_VHT) {
2030 ie = wpa_scan_get_ie(res, WLAN_EID_HT_CAP);
2031 if (ie) {
2032 tmp = max_ht20_rate(snr);
2033 if (tmp > est)
2034 est = tmp;
2035 }
2036 }
2037
2038 if (capab == CAPAB_HT40 || capab == CAPAB_VHT) {
2039 ie = wpa_scan_get_ie(res, WLAN_EID_HT_OPERATION);
2040 if (ie && ie[1] >= 2 &&
2041 (ie[3] & HT_INFO_HT_PARAM_SECONDARY_CHNL_OFF_MASK)) {
2042 tmp = max_ht40_rate(snr);
2043 if (tmp > est)
2044 est = tmp;
2045 }
2046 }
2047
2048 if (capab == CAPAB_VHT) {
2049 /* Use +1 to assume VHT is always faster than HT */
2050 ie = wpa_scan_get_ie(res, WLAN_EID_VHT_CAP);
2051 if (ie) {
2052 tmp = max_ht20_rate(snr) + 1;
2053 if (tmp > est)
2054 est = tmp;
2055
2056 ie = wpa_scan_get_ie(res, WLAN_EID_HT_OPERATION);
2057 if (ie && ie[1] >= 2 &&
2058 (ie[3] &
2059 HT_INFO_HT_PARAM_SECONDARY_CHNL_OFF_MASK)) {
2060 tmp = max_ht40_rate(snr) + 1;
2061 if (tmp > est)
2062 est = tmp;
2063 }
2064
2065 ie = wpa_scan_get_ie(res, WLAN_EID_VHT_OPERATION);
2066 if (ie && ie[1] >= 1 &&
2067 (ie[2] & VHT_OPMODE_CHANNEL_WIDTH_MASK)) {
2068 tmp = max_vht80_rate(snr) + 1;
2069 if (tmp > est)
2070 est = tmp;
2071 }
2072 }
2073 }
2074
2075 /* TODO: channel utilization and AP load (e.g., from AP Beacon) */
2076
2077 res->est_throughput = est;
2078 }
2079
2080
2081 /**
2082 * wpa_supplicant_get_scan_results - Get scan results
2083 * @wpa_s: Pointer to wpa_supplicant data
2084 * @info: Information about what was scanned or %NULL if not available
2085 * @new_scan: Whether a new scan was performed
2086 * Returns: Scan results, %NULL on failure
2087 *
2088 * This function request the current scan results from the driver and updates
2089 * the local BSS list wpa_s->bss. The caller is responsible for freeing the
2090 * results with wpa_scan_results_free().
2091 */
2092 struct wpa_scan_results *
2093 wpa_supplicant_get_scan_results(struct wpa_supplicant *wpa_s,
2094 struct scan_info *info, int new_scan)
2095 {
2096 struct wpa_scan_results *scan_res;
2097 size_t i;
2098 int (*compar)(const void *, const void *) = wpa_scan_result_compar;
2099
2100 scan_res = wpa_drv_get_scan_results2(wpa_s);
2101 if (scan_res == NULL) {
2102 wpa_dbg(wpa_s, MSG_DEBUG, "Failed to get scan results");
2103 return NULL;
2104 }
2105 if (scan_res->fetch_time.sec == 0) {
2106 /*
2107 * Make sure we have a valid timestamp if the driver wrapper
2108 * does not set this.
2109 */
2110 os_get_reltime(&scan_res->fetch_time);
2111 }
2112 filter_scan_res(wpa_s, scan_res);
2113
2114 for (i = 0; i < scan_res->num; i++) {
2115 struct wpa_scan_res *scan_res_item = scan_res->res[i];
2116
2117 scan_snr(scan_res_item);
2118 scan_est_throughput(wpa_s, scan_res_item);
2119 }
2120
2121 #ifdef CONFIG_WPS
2122 if (wpas_wps_searching(wpa_s)) {
2123 wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Order scan results with WPS "
2124 "provisioning rules");
2125 compar = wpa_scan_result_wps_compar;
2126 }
2127 #endif /* CONFIG_WPS */
2128
2129 qsort(scan_res->res, scan_res->num, sizeof(struct wpa_scan_res *),
2130 compar);
2131 dump_scan_res(scan_res);
2132
2133 wpa_bss_update_start(wpa_s);
2134 for (i = 0; i < scan_res->num; i++)
2135 wpa_bss_update_scan_res(wpa_s, scan_res->res[i],
2136 &scan_res->fetch_time);
2137 wpa_bss_update_end(wpa_s, info, new_scan);
2138
2139 return scan_res;
2140 }
2141
2142
2143 /**
2144 * wpa_supplicant_update_scan_results - Update scan results from the driver
2145 * @wpa_s: Pointer to wpa_supplicant data
2146 * Returns: 0 on success, -1 on failure
2147 *
2148 * This function updates the BSS table within wpa_supplicant based on the
2149 * currently available scan results from the driver without requesting a new
2150 * scan. This is used in cases where the driver indicates an association
2151 * (including roaming within ESS) and wpa_supplicant does not yet have the
2152 * needed information to complete the connection (e.g., to perform validation
2153 * steps in 4-way handshake).
2154 */
2155 int wpa_supplicant_update_scan_results(struct wpa_supplicant *wpa_s)
2156 {
2157 struct wpa_scan_results *scan_res;
2158 scan_res = wpa_supplicant_get_scan_results(wpa_s, NULL, 0);
2159 if (scan_res == NULL)
2160 return -1;
2161 wpa_scan_results_free(scan_res);
2162
2163 return 0;
2164 }
2165
2166
2167 /**
2168 * scan_only_handler - Reports scan results
2169 */
2170 void scan_only_handler(struct wpa_supplicant *wpa_s,
2171 struct wpa_scan_results *scan_res)
2172 {
2173 wpa_dbg(wpa_s, MSG_DEBUG, "Scan-only results received");
2174 if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
2175 wpa_s->manual_scan_use_id && wpa_s->own_scan_running) {
2176 wpa_msg_ctrl(wpa_s, MSG_INFO, WPA_EVENT_SCAN_RESULTS "id=%u",
2177 wpa_s->manual_scan_id);
2178 wpa_s->manual_scan_use_id = 0;
2179 } else {
2180 wpa_msg_ctrl(wpa_s, MSG_INFO, WPA_EVENT_SCAN_RESULTS);
2181 }
2182 wpas_notify_scan_results(wpa_s);
2183 wpas_notify_scan_done(wpa_s, 1);
2184 if (wpa_s->scan_work) {
2185 struct wpa_radio_work *work = wpa_s->scan_work;
2186 wpa_s->scan_work = NULL;
2187 radio_work_done(work);
2188 }
2189
2190 if (wpa_s->wpa_state == WPA_SCANNING)
2191 wpa_supplicant_set_state(wpa_s, wpa_s->scan_prev_wpa_state);
2192 }
2193
2194
2195 int wpas_scan_scheduled(struct wpa_supplicant *wpa_s)
2196 {
2197 return eloop_is_timeout_registered(wpa_supplicant_scan, wpa_s, NULL);
2198 }
2199
2200
2201 struct wpa_driver_scan_params *
2202 wpa_scan_clone_params(const struct wpa_driver_scan_params *src)
2203 {
2204 struct wpa_driver_scan_params *params;
2205 size_t i;
2206 u8 *n;
2207
2208 params = os_zalloc(sizeof(*params));
2209 if (params == NULL)
2210 return NULL;
2211
2212 for (i = 0; i < src->num_ssids; i++) {
2213 if (src->ssids[i].ssid) {
2214 n = os_malloc(src->ssids[i].ssid_len);
2215 if (n == NULL)
2216 goto failed;
2217 os_memcpy(n, src->ssids[i].ssid,
2218 src->ssids[i].ssid_len);
2219 params->ssids[i].ssid = n;
2220 params->ssids[i].ssid_len = src->ssids[i].ssid_len;
2221 }
2222 }
2223 params->num_ssids = src->num_ssids;
2224
2225 if (src->extra_ies) {
2226 n = os_malloc(src->extra_ies_len);
2227 if (n == NULL)
2228 goto failed;
2229 os_memcpy(n, src->extra_ies, src->extra_ies_len);
2230 params->extra_ies = n;
2231 params->extra_ies_len = src->extra_ies_len;
2232 }
2233
2234 if (src->freqs) {
2235 int len = int_array_len(src->freqs);
2236 params->freqs = os_malloc((len + 1) * sizeof(int));
2237 if (params->freqs == NULL)
2238 goto failed;
2239 os_memcpy(params->freqs, src->freqs, (len + 1) * sizeof(int));
2240 }
2241
2242 if (src->filter_ssids) {
2243 params->filter_ssids = os_malloc(sizeof(*params->filter_ssids) *
2244 src->num_filter_ssids);
2245 if (params->filter_ssids == NULL)
2246 goto failed;
2247 os_memcpy(params->filter_ssids, src->filter_ssids,
2248 sizeof(*params->filter_ssids) *
2249 src->num_filter_ssids);
2250 params->num_filter_ssids = src->num_filter_ssids;
2251 }
2252
2253 params->filter_rssi = src->filter_rssi;
2254 params->p2p_probe = src->p2p_probe;
2255 params->only_new_results = src->only_new_results;
2256 params->low_priority = src->low_priority;
2257
2258 if (src->sched_scan_plans_num > 0) {
2259 params->sched_scan_plans =
2260 os_malloc(sizeof(*src->sched_scan_plans) *
2261 src->sched_scan_plans_num);
2262 if (!params->sched_scan_plans)
2263 goto failed;
2264
2265 os_memcpy(params->sched_scan_plans, src->sched_scan_plans,
2266 sizeof(*src->sched_scan_plans) *
2267 src->sched_scan_plans_num);
2268 params->sched_scan_plans_num = src->sched_scan_plans_num;
2269 }
2270
2271 if (src->mac_addr_rand) {
2272 params->mac_addr_rand = src->mac_addr_rand;
2273
2274 if (src->mac_addr && src->mac_addr_mask) {
2275 u8 *mac_addr;
2276
2277 mac_addr = os_malloc(2 * ETH_ALEN);
2278 if (!mac_addr)
2279 goto failed;
2280
2281 os_memcpy(mac_addr, src->mac_addr, ETH_ALEN);
2282 os_memcpy(mac_addr + ETH_ALEN, src->mac_addr_mask,
2283 ETH_ALEN);
2284 params->mac_addr = mac_addr;
2285 params->mac_addr_mask = mac_addr + ETH_ALEN;
2286 }
2287 }
2288
2289 if (src->bssid) {
2290 u8 *bssid;
2291
2292 bssid = os_malloc(ETH_ALEN);
2293 if (!bssid)
2294 goto failed;
2295 os_memcpy(bssid, src->bssid, ETH_ALEN);
2296 params->bssid = bssid;
2297 }
2298
2299 return params;
2300
2301 failed:
2302 wpa_scan_free_params(params);
2303 return NULL;
2304 }
2305
2306
2307 void wpa_scan_free_params(struct wpa_driver_scan_params *params)
2308 {
2309 size_t i;
2310
2311 if (params == NULL)
2312 return;
2313
2314 for (i = 0; i < params->num_ssids; i++)
2315 os_free((u8 *) params->ssids[i].ssid);
2316 os_free((u8 *) params->extra_ies);
2317 os_free(params->freqs);
2318 os_free(params->filter_ssids);
2319 os_free(params->sched_scan_plans);
2320
2321 /*
2322 * Note: params->mac_addr_mask points to same memory allocation and
2323 * must not be freed separately.
2324 */
2325 os_free((u8 *) params->mac_addr);
2326
2327 os_free((u8 *) params->bssid);
2328
2329 os_free(params);
2330 }
2331
2332
2333 int wpas_start_pno(struct wpa_supplicant *wpa_s)
2334 {
2335 int ret, prio;
2336 size_t i, num_ssid, num_match_ssid;
2337 struct wpa_ssid *ssid;
2338 struct wpa_driver_scan_params params;
2339 struct sched_scan_plan scan_plan;
2340 unsigned int max_sched_scan_ssids;
2341
2342 if (!wpa_s->sched_scan_supported)
2343 return -1;
2344
2345 if (wpa_s->max_sched_scan_ssids > WPAS_MAX_SCAN_SSIDS)
2346 max_sched_scan_ssids = WPAS_MAX_SCAN_SSIDS;
2347 else
2348 max_sched_scan_ssids = wpa_s->max_sched_scan_ssids;
2349 if (max_sched_scan_ssids < 1)
2350 return -1;
2351
2352 if (wpa_s->pno || wpa_s->pno_sched_pending)
2353 return 0;
2354
2355 if ((wpa_s->wpa_state > WPA_SCANNING) &&
2356 (wpa_s->wpa_state <= WPA_COMPLETED)) {
2357 wpa_printf(MSG_ERROR, "PNO: In assoc process");
2358 return -EAGAIN;
2359 }
2360
2361 if (wpa_s->wpa_state == WPA_SCANNING) {
2362 wpa_supplicant_cancel_scan(wpa_s);
2363 if (wpa_s->sched_scanning) {
2364 wpa_printf(MSG_DEBUG, "Schedule PNO on completion of "
2365 "ongoing sched scan");
2366 wpa_supplicant_cancel_sched_scan(wpa_s);
2367 wpa_s->pno_sched_pending = 1;
2368 return 0;
2369 }
2370 }
2371
2372 os_memset(&params, 0, sizeof(params));
2373
2374 num_ssid = num_match_ssid = 0;
2375 ssid = wpa_s->conf->ssid;
2376 while (ssid) {
2377 if (!wpas_network_disabled(wpa_s, ssid)) {
2378 num_match_ssid++;
2379 if (ssid->scan_ssid)
2380 num_ssid++;
2381 }
2382 ssid = ssid->next;
2383 }
2384
2385 if (num_match_ssid == 0) {
2386 wpa_printf(MSG_DEBUG, "PNO: No configured SSIDs");
2387 return -1;
2388 }
2389
2390 if (num_match_ssid > num_ssid) {
2391 params.num_ssids++; /* wildcard */
2392 num_ssid++;
2393 }
2394
2395 if (num_ssid > max_sched_scan_ssids) {
2396 wpa_printf(MSG_DEBUG, "PNO: Use only the first %u SSIDs from "
2397 "%u", max_sched_scan_ssids, (unsigned int) num_ssid);
2398 num_ssid = max_sched_scan_ssids;
2399 }
2400
2401 if (num_match_ssid > wpa_s->max_match_sets) {
2402 num_match_ssid = wpa_s->max_match_sets;
2403 wpa_dbg(wpa_s, MSG_DEBUG, "PNO: Too many SSIDs to match");
2404 }
2405 params.filter_ssids = os_calloc(num_match_ssid,
2406 sizeof(struct wpa_driver_scan_filter));
2407 if (params.filter_ssids == NULL)
2408 return -1;
2409
2410 i = 0;
2411 prio = 0;
2412 ssid = wpa_s->conf->pssid[prio];
2413 while (ssid) {
2414 if (!wpas_network_disabled(wpa_s, ssid)) {
2415 if (ssid->scan_ssid && params.num_ssids < num_ssid) {
2416 params.ssids[params.num_ssids].ssid =
2417 ssid->ssid;
2418 params.ssids[params.num_ssids].ssid_len =
2419 ssid->ssid_len;
2420 params.num_ssids++;
2421 }
2422 os_memcpy(params.filter_ssids[i].ssid, ssid->ssid,
2423 ssid->ssid_len);
2424 params.filter_ssids[i].ssid_len = ssid->ssid_len;
2425 params.num_filter_ssids++;
2426 i++;
2427 if (i == num_match_ssid)
2428 break;
2429 }
2430 if (ssid->pnext)
2431 ssid = ssid->pnext;
2432 else if (prio + 1 == wpa_s->conf->num_prio)
2433 break;
2434 else
2435 ssid = wpa_s->conf->pssid[++prio];
2436 }
2437
2438 if (wpa_s->conf->filter_rssi)
2439 params.filter_rssi = wpa_s->conf->filter_rssi;
2440
2441 if (wpa_s->sched_scan_plans_num) {
2442 params.sched_scan_plans = wpa_s->sched_scan_plans;
2443 params.sched_scan_plans_num = wpa_s->sched_scan_plans_num;
2444 } else {
2445 /* Set one scan plan that will run infinitely */
2446 if (wpa_s->conf->sched_scan_interval)
2447 scan_plan.interval = wpa_s->conf->sched_scan_interval;
2448 else
2449 scan_plan.interval = 10;
2450
2451 scan_plan.iterations = 0;
2452 params.sched_scan_plans = &scan_plan;
2453 params.sched_scan_plans_num = 1;
2454 }
2455
2456 if (params.freqs == NULL && wpa_s->manual_sched_scan_freqs) {
2457 wpa_dbg(wpa_s, MSG_DEBUG, "Limit sched scan to specified channels");
2458 params.freqs = wpa_s->manual_sched_scan_freqs;
2459 }
2460
2461 if (wpa_s->mac_addr_rand_enable & MAC_ADDR_RAND_PNO) {
2462 params.mac_addr_rand = 1;
2463 if (wpa_s->mac_addr_pno) {
2464 params.mac_addr = wpa_s->mac_addr_pno;
2465 params.mac_addr_mask = wpa_s->mac_addr_pno + ETH_ALEN;
2466 }
2467 }
2468
2469 ret = wpa_supplicant_start_sched_scan(wpa_s, &params);
2470 os_free(params.filter_ssids);
2471 if (ret == 0)
2472 wpa_s->pno = 1;
2473 else
2474 wpa_msg(wpa_s, MSG_ERROR, "Failed to schedule PNO");
2475 return ret;
2476 }
2477
2478
2479 int wpas_stop_pno(struct wpa_supplicant *wpa_s)
2480 {
2481 int ret = 0;
2482
2483 if (!wpa_s->pno)
2484 return 0;
2485
2486 ret = wpa_supplicant_stop_sched_scan(wpa_s);
2487
2488 wpa_s->pno = 0;
2489 wpa_s->pno_sched_pending = 0;
2490
2491 if (wpa_s->wpa_state == WPA_SCANNING)
2492 wpa_supplicant_req_scan(wpa_s, 0, 0);
2493
2494 return ret;
2495 }
2496
2497
2498 void wpas_mac_addr_rand_scan_clear(struct wpa_supplicant *wpa_s,
2499 unsigned int type)
2500 {
2501 type &= MAC_ADDR_RAND_ALL;
2502 wpa_s->mac_addr_rand_enable &= ~type;
2503
2504 if (type & MAC_ADDR_RAND_SCAN) {
2505 os_free(wpa_s->mac_addr_scan);
2506 wpa_s->mac_addr_scan = NULL;
2507 }
2508
2509 if (type & MAC_ADDR_RAND_SCHED_SCAN) {
2510 os_free(wpa_s->mac_addr_sched_scan);
2511 wpa_s->mac_addr_sched_scan = NULL;
2512 }
2513
2514 if (type & MAC_ADDR_RAND_PNO) {
2515 os_free(wpa_s->mac_addr_pno);
2516 wpa_s->mac_addr_pno = NULL;
2517 }
2518 }
2519
2520
2521 int wpas_mac_addr_rand_scan_set(struct wpa_supplicant *wpa_s,
2522 unsigned int type, const u8 *addr,
2523 const u8 *mask)
2524 {
2525 u8 *tmp = NULL;
2526
2527 wpas_mac_addr_rand_scan_clear(wpa_s, type);
2528
2529 if (addr) {
2530 tmp = os_malloc(2 * ETH_ALEN);
2531 if (!tmp)
2532 return -1;
2533 os_memcpy(tmp, addr, ETH_ALEN);
2534 os_memcpy(tmp + ETH_ALEN, mask, ETH_ALEN);
2535 }
2536
2537 if (type == MAC_ADDR_RAND_SCAN) {
2538 wpa_s->mac_addr_scan = tmp;
2539 } else if (type == MAC_ADDR_RAND_SCHED_SCAN) {
2540 wpa_s->mac_addr_sched_scan = tmp;
2541 } else if (type == MAC_ADDR_RAND_PNO) {
2542 wpa_s->mac_addr_pno = tmp;
2543 } else {
2544 wpa_printf(MSG_INFO,
2545 "scan: Invalid MAC randomization type=0x%x",
2546 type);
2547 os_free(tmp);
2548 return -1;
2549 }
2550
2551 wpa_s->mac_addr_rand_enable |= type;
2552 return 0;
2553 }
2554
2555
2556 int wpas_abort_ongoing_scan(struct wpa_supplicant *wpa_s)
2557 {
2558 int scan_work = !!wpa_s->scan_work;
2559
2560 #ifdef CONFIG_P2P
2561 scan_work |= !!wpa_s->p2p_scan_work;
2562 #endif /* CONFIG_P2P */
2563
2564 if (scan_work && wpa_s->own_scan_running) {
2565 wpa_dbg(wpa_s, MSG_DEBUG, "Abort an ongoing scan");
2566 return wpa_drv_abort_scan(wpa_s);
2567 }
2568
2569 return 0;
2570 }
2571
2572
2573 int wpas_sched_scan_plans_set(struct wpa_supplicant *wpa_s, const char *cmd)
2574 {
2575 struct sched_scan_plan *scan_plans = NULL;
2576 const char *token, *context = NULL;
2577 unsigned int num = 0;
2578
2579 if (!cmd)
2580 return -1;
2581
2582 if (!cmd[0]) {
2583 wpa_printf(MSG_DEBUG, "Clear sched scan plans");
2584 os_free(wpa_s->sched_scan_plans);
2585 wpa_s->sched_scan_plans = NULL;
2586 wpa_s->sched_scan_plans_num = 0;
2587 return 0;
2588 }
2589
2590 while ((token = cstr_token(cmd, " ", &context))) {
2591 int ret;
2592 struct sched_scan_plan *scan_plan, *n;
2593
2594 n = os_realloc_array(scan_plans, num + 1, sizeof(*scan_plans));
2595 if (!n)
2596 goto fail;
2597
2598 scan_plans = n;
2599 scan_plan = &scan_plans[num];
2600 num++;
2601
2602 ret = sscanf(token, "%u:%u", &scan_plan->interval,
2603 &scan_plan->iterations);
2604 if (ret <= 0 || ret > 2 || !scan_plan->interval) {
2605 wpa_printf(MSG_ERROR,
2606 "Invalid sched scan plan input: %s", token);
2607 goto fail;
2608 }
2609
2610 if (scan_plan->interval > wpa_s->max_sched_scan_plan_interval) {
2611 wpa_printf(MSG_WARNING,
2612 "scan plan %u: Scan interval too long(%u), use the maximum allowed(%u)",
2613 num, scan_plan->interval,
2614 wpa_s->max_sched_scan_plan_interval);
2615 scan_plan->interval =
2616 wpa_s->max_sched_scan_plan_interval;
2617 }
2618
2619 if (ret == 1) {
2620 scan_plan->iterations = 0;
2621 break;
2622 }
2623
2624 if (!scan_plan->iterations) {
2625 wpa_printf(MSG_ERROR,
2626 "scan plan %u: Number of iterations cannot be zero",
2627 num);
2628 goto fail;
2629 }
2630
2631 if (scan_plan->iterations >
2632 wpa_s->max_sched_scan_plan_iterations) {
2633 wpa_printf(MSG_WARNING,
2634 "scan plan %u: Too many iterations(%u), use the maximum allowed(%u)",
2635 num, scan_plan->iterations,
2636 wpa_s->max_sched_scan_plan_iterations);
2637 scan_plan->iterations =
2638 wpa_s->max_sched_scan_plan_iterations;
2639 }
2640
2641 wpa_printf(MSG_DEBUG,
2642 "scan plan %u: interval=%u iterations=%u",
2643 num, scan_plan->interval, scan_plan->iterations);
2644 }
2645
2646 if (!scan_plans) {
2647 wpa_printf(MSG_ERROR, "Invalid scan plans entry");
2648 goto fail;
2649 }
2650
2651 if (cstr_token(cmd, " ", &context) || scan_plans[num - 1].iterations) {
2652 wpa_printf(MSG_ERROR,
2653 "All scan plans but the last must specify a number of iterations");
2654 goto fail;
2655 }
2656
2657 wpa_printf(MSG_DEBUG, "scan plan %u (last plan): interval=%u",
2658 num, scan_plans[num - 1].interval);
2659
2660 if (num > wpa_s->max_sched_scan_plans) {
2661 wpa_printf(MSG_WARNING,
2662 "Too many scheduled scan plans (only %u supported)",
2663 wpa_s->max_sched_scan_plans);
2664 wpa_printf(MSG_WARNING,
2665 "Use only the first %u scan plans, and the last one (in infinite loop)",
2666 wpa_s->max_sched_scan_plans - 1);
2667 os_memcpy(&scan_plans[wpa_s->max_sched_scan_plans - 1],
2668 &scan_plans[num - 1], sizeof(*scan_plans));
2669 num = wpa_s->max_sched_scan_plans;
2670 }
2671
2672 os_free(wpa_s->sched_scan_plans);
2673 wpa_s->sched_scan_plans = scan_plans;
2674 wpa_s->sched_scan_plans_num = num;
2675
2676 return 0;
2677
2678 fail:
2679 os_free(scan_plans);
2680 wpa_printf(MSG_ERROR, "invalid scan plans list");
2681 return -1;
2682 }
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