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