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Add support to request a scan with specific SSIDs
[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 int interval)
272 {
273 int ret;
274
275 wpa_supplicant_notify_scanning(wpa_s, 1);
276 ret = wpa_drv_sched_scan(wpa_s, params, interval * 1000);
277 if (ret)
278 wpa_supplicant_notify_scanning(wpa_s, 0);
279 else
280 wpa_s->sched_scanning = 1;
281
282 return ret;
283 }
284
285
286 int wpa_supplicant_stop_sched_scan(struct wpa_supplicant *wpa_s)
287 {
288 int ret;
289
290 ret = wpa_drv_stop_sched_scan(wpa_s);
291 if (ret) {
292 wpa_dbg(wpa_s, MSG_DEBUG, "stopping sched_scan failed!");
293 /* TODO: what to do if stopping fails? */
294 return -1;
295 }
296
297 return ret;
298 }
299
300
301 static struct wpa_driver_scan_filter *
302 wpa_supplicant_build_filter_ssids(struct wpa_config *conf, size_t *num_ssids)
303 {
304 struct wpa_driver_scan_filter *ssids;
305 struct wpa_ssid *ssid;
306 size_t count;
307
308 *num_ssids = 0;
309 if (!conf->filter_ssids)
310 return NULL;
311
312 for (count = 0, ssid = conf->ssid; ssid; ssid = ssid->next) {
313 if (ssid->ssid && ssid->ssid_len)
314 count++;
315 }
316 if (count == 0)
317 return NULL;
318 ssids = os_calloc(count, sizeof(struct wpa_driver_scan_filter));
319 if (ssids == NULL)
320 return NULL;
321
322 for (ssid = conf->ssid; ssid; ssid = ssid->next) {
323 if (!ssid->ssid || !ssid->ssid_len)
324 continue;
325 os_memcpy(ssids[*num_ssids].ssid, ssid->ssid, ssid->ssid_len);
326 ssids[*num_ssids].ssid_len = ssid->ssid_len;
327 (*num_ssids)++;
328 }
329
330 return ssids;
331 }
332
333
334 static void wpa_supplicant_optimize_freqs(
335 struct wpa_supplicant *wpa_s, struct wpa_driver_scan_params *params)
336 {
337 #ifdef CONFIG_P2P
338 if (params->freqs == NULL && wpa_s->p2p_in_provisioning &&
339 wpa_s->go_params) {
340 /* Optimize provisioning state scan based on GO information */
341 if (wpa_s->p2p_in_provisioning < 5 &&
342 wpa_s->go_params->freq > 0) {
343 wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only GO "
344 "preferred frequency %d MHz",
345 wpa_s->go_params->freq);
346 params->freqs = os_calloc(2, sizeof(int));
347 if (params->freqs)
348 params->freqs[0] = wpa_s->go_params->freq;
349 } else if (wpa_s->p2p_in_provisioning < 8 &&
350 wpa_s->go_params->freq_list[0]) {
351 wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only common "
352 "channels");
353 int_array_concat(&params->freqs,
354 wpa_s->go_params->freq_list);
355 if (params->freqs)
356 int_array_sort_unique(params->freqs);
357 }
358 wpa_s->p2p_in_provisioning++;
359 }
360
361 if (params->freqs == NULL && wpa_s->p2p_in_invitation) {
362 /*
363 * Optimize scan based on GO information during persistent
364 * group reinvocation
365 */
366 if (wpa_s->p2p_in_invitation < 5 &&
367 wpa_s->p2p_invite_go_freq > 0) {
368 wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only GO preferred frequency %d MHz during invitation",
369 wpa_s->p2p_invite_go_freq);
370 params->freqs = os_calloc(2, sizeof(int));
371 if (params->freqs)
372 params->freqs[0] = wpa_s->p2p_invite_go_freq;
373 }
374 wpa_s->p2p_in_invitation++;
375 if (wpa_s->p2p_in_invitation > 20) {
376 /*
377 * This should not really happen since the variable is
378 * cleared on group removal, but if it does happen, make
379 * sure we do not get stuck in special invitation scan
380 * mode.
381 */
382 wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Clear p2p_in_invitation");
383 wpa_s->p2p_in_invitation = 0;
384 }
385 }
386 #endif /* CONFIG_P2P */
387
388 #ifdef CONFIG_WPS
389 if (params->freqs == NULL && wpa_s->after_wps && wpa_s->wps_freq) {
390 /*
391 * Optimize post-provisioning scan based on channel used
392 * during provisioning.
393 */
394 wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Scan only frequency %u MHz "
395 "that was used during provisioning", wpa_s->wps_freq);
396 params->freqs = os_calloc(2, sizeof(int));
397 if (params->freqs)
398 params->freqs[0] = wpa_s->wps_freq;
399 wpa_s->after_wps--;
400 } else if (wpa_s->after_wps)
401 wpa_s->after_wps--;
402
403 if (params->freqs == NULL && wpa_s->known_wps_freq && wpa_s->wps_freq)
404 {
405 /* Optimize provisioning scan based on already known channel */
406 wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Scan only frequency %u MHz",
407 wpa_s->wps_freq);
408 params->freqs = os_calloc(2, sizeof(int));
409 if (params->freqs)
410 params->freqs[0] = wpa_s->wps_freq;
411 wpa_s->known_wps_freq = 0; /* only do this once */
412 }
413 #endif /* CONFIG_WPS */
414 }
415
416
417 #ifdef CONFIG_INTERWORKING
418 static void wpas_add_interworking_elements(struct wpa_supplicant *wpa_s,
419 struct wpabuf *buf)
420 {
421 wpabuf_put_u8(buf, WLAN_EID_INTERWORKING);
422 wpabuf_put_u8(buf, is_zero_ether_addr(wpa_s->conf->hessid) ? 1 :
423 1 + ETH_ALEN);
424 wpabuf_put_u8(buf, wpa_s->conf->access_network_type);
425 /* No Venue Info */
426 if (!is_zero_ether_addr(wpa_s->conf->hessid))
427 wpabuf_put_data(buf, wpa_s->conf->hessid, ETH_ALEN);
428 }
429 #endif /* CONFIG_INTERWORKING */
430
431
432 static struct wpabuf * wpa_supplicant_extra_ies(struct wpa_supplicant *wpa_s)
433 {
434 struct wpabuf *extra_ie = NULL;
435 u8 ext_capab[18];
436 int ext_capab_len;
437 #ifdef CONFIG_WPS
438 int wps = 0;
439 enum wps_request_type req_type = WPS_REQ_ENROLLEE_INFO;
440 #endif /* CONFIG_WPS */
441
442 ext_capab_len = wpas_build_ext_capab(wpa_s, ext_capab,
443 sizeof(ext_capab));
444 if (ext_capab_len > 0 &&
445 wpabuf_resize(&extra_ie, ext_capab_len) == 0)
446 wpabuf_put_data(extra_ie, ext_capab, ext_capab_len);
447
448 #ifdef CONFIG_INTERWORKING
449 if (wpa_s->conf->interworking &&
450 wpabuf_resize(&extra_ie, 100) == 0)
451 wpas_add_interworking_elements(wpa_s, extra_ie);
452 #endif /* CONFIG_INTERWORKING */
453
454 #ifdef CONFIG_WPS
455 wps = wpas_wps_in_use(wpa_s, &req_type);
456
457 if (wps) {
458 struct wpabuf *wps_ie;
459 wps_ie = wps_build_probe_req_ie(wps == 2 ? DEV_PW_PUSHBUTTON :
460 DEV_PW_DEFAULT,
461 &wpa_s->wps->dev,
462 wpa_s->wps->uuid, req_type,
463 0, NULL);
464 if (wps_ie) {
465 if (wpabuf_resize(&extra_ie, wpabuf_len(wps_ie)) == 0)
466 wpabuf_put_buf(extra_ie, wps_ie);
467 wpabuf_free(wps_ie);
468 }
469 }
470
471 #ifdef CONFIG_P2P
472 if (wps) {
473 size_t ielen = p2p_scan_ie_buf_len(wpa_s->global->p2p);
474 if (wpabuf_resize(&extra_ie, ielen) == 0)
475 wpas_p2p_scan_ie(wpa_s, extra_ie);
476 }
477 #endif /* CONFIG_P2P */
478
479 wpa_supplicant_mesh_add_scan_ie(wpa_s, &extra_ie);
480
481 #endif /* CONFIG_WPS */
482
483 #ifdef CONFIG_HS20
484 if (wpa_s->conf->hs20 && wpabuf_resize(&extra_ie, 7) == 0)
485 wpas_hs20_add_indication(extra_ie, -1);
486 #endif /* CONFIG_HS20 */
487
488 return extra_ie;
489 }
490
491
492 #ifdef CONFIG_P2P
493
494 /*
495 * Check whether there are any enabled networks or credentials that could be
496 * used for a non-P2P connection.
497 */
498 static int non_p2p_network_enabled(struct wpa_supplicant *wpa_s)
499 {
500 struct wpa_ssid *ssid;
501
502 for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
503 if (wpas_network_disabled(wpa_s, ssid))
504 continue;
505 if (!ssid->p2p_group)
506 return 1;
507 }
508
509 if (wpa_s->conf->cred && wpa_s->conf->interworking &&
510 wpa_s->conf->auto_interworking)
511 return 1;
512
513 return 0;
514 }
515
516 #endif /* CONFIG_P2P */
517
518
519 static struct hostapd_hw_modes * get_mode(struct hostapd_hw_modes *modes,
520 u16 num_modes,
521 enum hostapd_hw_mode mode)
522 {
523 u16 i;
524
525 for (i = 0; i < num_modes; i++) {
526 if (modes[i].mode == mode)
527 return &modes[i];
528 }
529
530 return NULL;
531 }
532
533
534 static void wpa_setband_scan_freqs_list(struct wpa_supplicant *wpa_s,
535 enum hostapd_hw_mode band,
536 struct wpa_driver_scan_params *params)
537 {
538 /* Include only supported channels for the specified band */
539 struct hostapd_hw_modes *mode;
540 int count, i;
541
542 mode = get_mode(wpa_s->hw.modes, wpa_s->hw.num_modes, band);
543 if (mode == NULL) {
544 /* No channels supported in this band - use empty list */
545 params->freqs = os_zalloc(sizeof(int));
546 return;
547 }
548
549 params->freqs = os_calloc(mode->num_channels + 1, sizeof(int));
550 if (params->freqs == NULL)
551 return;
552 for (count = 0, i = 0; i < mode->num_channels; i++) {
553 if (mode->channels[i].flag & HOSTAPD_CHAN_DISABLED)
554 continue;
555 params->freqs[count++] = mode->channels[i].freq;
556 }
557 }
558
559
560 static void wpa_setband_scan_freqs(struct wpa_supplicant *wpa_s,
561 struct wpa_driver_scan_params *params)
562 {
563 if (wpa_s->hw.modes == NULL)
564 return; /* unknown what channels the driver supports */
565 if (params->freqs)
566 return; /* already using a limited channel set */
567 if (wpa_s->setband == WPA_SETBAND_5G)
568 wpa_setband_scan_freqs_list(wpa_s, HOSTAPD_MODE_IEEE80211A,
569 params);
570 else if (wpa_s->setband == WPA_SETBAND_2G)
571 wpa_setband_scan_freqs_list(wpa_s, HOSTAPD_MODE_IEEE80211G,
572 params);
573 }
574
575
576 static void wpa_set_scan_ssids(struct wpa_supplicant *wpa_s,
577 struct wpa_driver_scan_params *params,
578 size_t max_ssids)
579 {
580 unsigned int i;
581 struct wpa_ssid *ssid;
582
583 for (i = 0; i < wpa_s->scan_id_count; i++) {
584 unsigned int j;
585
586 ssid = wpa_config_get_network(wpa_s->conf, wpa_s->scan_id[i]);
587 if (!ssid || !ssid->scan_ssid)
588 continue;
589
590 for (j = 0; j < params->num_ssids; j++) {
591 if (params->ssids[j].ssid_len == ssid->ssid_len &&
592 params->ssids[j].ssid &&
593 os_memcmp(params->ssids[j].ssid, ssid->ssid,
594 ssid->ssid_len) == 0)
595 break;
596 }
597 if (j < params->num_ssids)
598 continue; /* already in the list */
599
600 if (params->num_ssids + 1 > max_ssids) {
601 wpa_printf(MSG_DEBUG,
602 "Over max scan SSIDs for manual request");
603 break;
604 }
605
606 wpa_printf(MSG_DEBUG, "Scan SSID (manual request): %s",
607 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
608 params->ssids[params->num_ssids].ssid = ssid->ssid;
609 params->ssids[params->num_ssids].ssid_len = ssid->ssid_len;
610 params->num_ssids++;
611 }
612
613 wpa_s->scan_id_count = 0;
614 }
615
616
617 static int wpa_set_ssids_from_scan_req(struct wpa_supplicant *wpa_s,
618 struct wpa_driver_scan_params *params,
619 size_t max_ssids)
620 {
621 unsigned int i;
622
623 if (wpa_s->ssids_from_scan_req == NULL ||
624 wpa_s->num_ssids_from_scan_req == 0)
625 return 0;
626
627 if (wpa_s->num_ssids_from_scan_req > max_ssids) {
628 wpa_s->num_ssids_from_scan_req = max_ssids;
629 wpa_printf(MSG_DEBUG, "Over max scan SSIDs from scan req: %u",
630 (unsigned int) max_ssids);
631 }
632
633 for (i = 0; i < wpa_s->num_ssids_from_scan_req; i++) {
634 params->ssids[i].ssid = wpa_s->ssids_from_scan_req[i].ssid;
635 params->ssids[i].ssid_len =
636 wpa_s->ssids_from_scan_req[i].ssid_len;
637 wpa_hexdump_ascii(MSG_DEBUG, "specific SSID",
638 params->ssids[i].ssid,
639 params->ssids[i].ssid_len);
640 }
641
642 params->num_ssids = wpa_s->num_ssids_from_scan_req;
643 wpa_s->num_ssids_from_scan_req = 0;
644 return 1;
645 }
646
647
648 static void wpa_supplicant_scan(void *eloop_ctx, void *timeout_ctx)
649 {
650 struct wpa_supplicant *wpa_s = eloop_ctx;
651 struct wpa_ssid *ssid;
652 int ret, p2p_in_prog;
653 struct wpabuf *extra_ie = NULL;
654 struct wpa_driver_scan_params params;
655 struct wpa_driver_scan_params *scan_params;
656 size_t max_ssids;
657 int connect_without_scan = 0;
658
659 if (wpa_s->pno || wpa_s->pno_sched_pending) {
660 wpa_dbg(wpa_s, MSG_DEBUG, "Skip scan - PNO is in progress");
661 return;
662 }
663
664 if (wpa_s->wpa_state == WPA_INTERFACE_DISABLED) {
665 wpa_dbg(wpa_s, MSG_DEBUG, "Skip scan - interface disabled");
666 return;
667 }
668
669 if (wpa_s->disconnected && wpa_s->scan_req == NORMAL_SCAN_REQ) {
670 wpa_dbg(wpa_s, MSG_DEBUG, "Disconnected - do not scan");
671 wpa_supplicant_set_state(wpa_s, WPA_DISCONNECTED);
672 return;
673 }
674
675 if (wpa_s->scanning) {
676 /*
677 * If we are already in scanning state, we shall reschedule the
678 * the incoming scan request.
679 */
680 wpa_dbg(wpa_s, MSG_DEBUG, "Already scanning - Reschedule the incoming scan req");
681 wpa_supplicant_req_scan(wpa_s, 1, 0);
682 return;
683 }
684
685 if (!wpa_supplicant_enabled_networks(wpa_s) &&
686 wpa_s->scan_req == NORMAL_SCAN_REQ) {
687 wpa_dbg(wpa_s, MSG_DEBUG, "No enabled networks - do not scan");
688 wpa_supplicant_set_state(wpa_s, WPA_INACTIVE);
689 return;
690 }
691
692 if (wpa_s->conf->ap_scan != 0 &&
693 (wpa_s->drv_flags & WPA_DRIVER_FLAGS_WIRED)) {
694 wpa_dbg(wpa_s, MSG_DEBUG, "Using wired authentication - "
695 "overriding ap_scan configuration");
696 wpa_s->conf->ap_scan = 0;
697 wpas_notify_ap_scan_changed(wpa_s);
698 }
699
700 if (wpa_s->conf->ap_scan == 0) {
701 wpa_supplicant_gen_assoc_event(wpa_s);
702 return;
703 }
704
705 ssid = NULL;
706 if (wpa_s->scan_req != MANUAL_SCAN_REQ &&
707 wpa_s->connect_without_scan) {
708 connect_without_scan = 1;
709 for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
710 if (ssid == wpa_s->connect_without_scan)
711 break;
712 }
713 }
714
715 p2p_in_prog = wpas_p2p_in_progress(wpa_s);
716 if (p2p_in_prog && p2p_in_prog != 2 &&
717 (!ssid ||
718 (ssid->mode != WPAS_MODE_AP && ssid->mode != WPAS_MODE_P2P_GO))) {
719 wpa_dbg(wpa_s, MSG_DEBUG, "Delay station mode scan while P2P operation is in progress");
720 wpa_supplicant_req_scan(wpa_s, 5, 0);
721 return;
722 }
723
724 if (wpa_s->conf->ap_scan == 2)
725 max_ssids = 1;
726 else {
727 max_ssids = wpa_s->max_scan_ssids;
728 if (max_ssids > WPAS_MAX_SCAN_SSIDS)
729 max_ssids = WPAS_MAX_SCAN_SSIDS;
730 }
731
732 wpa_s->last_scan_req = wpa_s->scan_req;
733 wpa_s->scan_req = NORMAL_SCAN_REQ;
734
735 if (connect_without_scan) {
736 wpa_s->connect_without_scan = NULL;
737 if (ssid) {
738 wpa_printf(MSG_DEBUG, "Start a pre-selected network "
739 "without scan step");
740 wpa_supplicant_associate(wpa_s, NULL, ssid);
741 return;
742 }
743 }
744
745 os_memset(&params, 0, sizeof(params));
746
747 wpa_s->scan_prev_wpa_state = wpa_s->wpa_state;
748 if (wpa_s->wpa_state == WPA_DISCONNECTED ||
749 wpa_s->wpa_state == WPA_INACTIVE)
750 wpa_supplicant_set_state(wpa_s, WPA_SCANNING);
751
752 /*
753 * If autoscan has set its own scanning parameters
754 */
755 if (wpa_s->autoscan_params != NULL) {
756 scan_params = wpa_s->autoscan_params;
757 goto scan;
758 }
759
760 if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
761 wpa_set_ssids_from_scan_req(wpa_s, &params, max_ssids)) {
762 wpa_printf(MSG_DEBUG, "Use specific SSIDs from SCAN command");
763 goto ssid_list_set;
764 }
765
766 #ifdef CONFIG_P2P
767 if ((wpa_s->p2p_in_provisioning || wpa_s->show_group_started) &&
768 wpa_s->go_params && !wpa_s->conf->passive_scan) {
769 wpa_printf(MSG_DEBUG, "P2P: Use specific SSID for scan during P2P group formation (p2p_in_provisioning=%d show_group_started=%d)",
770 wpa_s->p2p_in_provisioning,
771 wpa_s->show_group_started);
772 params.ssids[0].ssid = wpa_s->go_params->ssid;
773 params.ssids[0].ssid_len = wpa_s->go_params->ssid_len;
774 params.num_ssids = 1;
775 goto ssid_list_set;
776 }
777
778 if (wpa_s->p2p_in_invitation) {
779 if (wpa_s->current_ssid) {
780 wpa_printf(MSG_DEBUG, "P2P: Use specific SSID for scan during invitation");
781 params.ssids[0].ssid = wpa_s->current_ssid->ssid;
782 params.ssids[0].ssid_len =
783 wpa_s->current_ssid->ssid_len;
784 params.num_ssids = 1;
785 } else {
786 wpa_printf(MSG_DEBUG, "P2P: No specific SSID known for scan during invitation");
787 }
788 goto ssid_list_set;
789 }
790 #endif /* CONFIG_P2P */
791
792 /* Find the starting point from which to continue scanning */
793 ssid = wpa_s->conf->ssid;
794 if (wpa_s->prev_scan_ssid != WILDCARD_SSID_SCAN) {
795 while (ssid) {
796 if (ssid == wpa_s->prev_scan_ssid) {
797 ssid = ssid->next;
798 break;
799 }
800 ssid = ssid->next;
801 }
802 }
803
804 if (wpa_s->last_scan_req != MANUAL_SCAN_REQ &&
805 wpa_s->conf->ap_scan == 2) {
806 wpa_s->connect_without_scan = NULL;
807 wpa_s->prev_scan_wildcard = 0;
808 wpa_supplicant_assoc_try(wpa_s, ssid);
809 return;
810 } else if (wpa_s->conf->ap_scan == 2) {
811 /*
812 * User-initiated scan request in ap_scan == 2; scan with
813 * wildcard SSID.
814 */
815 ssid = NULL;
816 } else if (wpa_s->reattach && wpa_s->current_ssid != NULL) {
817 /*
818 * Perform single-channel single-SSID scan for
819 * reassociate-to-same-BSS operation.
820 */
821 /* Setup SSID */
822 ssid = wpa_s->current_ssid;
823 wpa_hexdump_ascii(MSG_DEBUG, "Scan SSID",
824 ssid->ssid, ssid->ssid_len);
825 params.ssids[0].ssid = ssid->ssid;
826 params.ssids[0].ssid_len = ssid->ssid_len;
827 params.num_ssids = 1;
828
829 /*
830 * Allocate memory for frequency array, allocate one extra
831 * slot for the zero-terminator.
832 */
833 params.freqs = os_malloc(sizeof(int) * 2);
834 if (params.freqs == NULL) {
835 wpa_dbg(wpa_s, MSG_ERROR, "Memory allocation failed");
836 return;
837 }
838 params.freqs[0] = wpa_s->assoc_freq;
839 params.freqs[1] = 0;
840
841 /*
842 * Reset the reattach flag so that we fall back to full scan if
843 * this scan fails.
844 */
845 wpa_s->reattach = 0;
846 } else {
847 struct wpa_ssid *start = ssid, *tssid;
848 int freqs_set = 0;
849 if (ssid == NULL && max_ssids > 1)
850 ssid = wpa_s->conf->ssid;
851 while (ssid) {
852 if (!wpas_network_disabled(wpa_s, ssid) &&
853 ssid->scan_ssid) {
854 wpa_hexdump_ascii(MSG_DEBUG, "Scan SSID",
855 ssid->ssid, ssid->ssid_len);
856 params.ssids[params.num_ssids].ssid =
857 ssid->ssid;
858 params.ssids[params.num_ssids].ssid_len =
859 ssid->ssid_len;
860 params.num_ssids++;
861 if (params.num_ssids + 1 >= max_ssids)
862 break;
863 }
864 ssid = ssid->next;
865 if (ssid == start)
866 break;
867 if (ssid == NULL && max_ssids > 1 &&
868 start != wpa_s->conf->ssid)
869 ssid = wpa_s->conf->ssid;
870 }
871
872 if (wpa_s->scan_id_count &&
873 wpa_s->last_scan_req == MANUAL_SCAN_REQ)
874 wpa_set_scan_ssids(wpa_s, &params, max_ssids);
875
876 for (tssid = wpa_s->conf->ssid;
877 wpa_s->last_scan_req != MANUAL_SCAN_REQ && tssid;
878 tssid = tssid->next) {
879 if (wpas_network_disabled(wpa_s, tssid))
880 continue;
881 if ((params.freqs || !freqs_set) && tssid->scan_freq) {
882 int_array_concat(&params.freqs,
883 tssid->scan_freq);
884 } else {
885 os_free(params.freqs);
886 params.freqs = NULL;
887 }
888 freqs_set = 1;
889 }
890 int_array_sort_unique(params.freqs);
891 }
892
893 if (ssid && max_ssids == 1) {
894 /*
895 * If the driver is limited to 1 SSID at a time interleave
896 * wildcard SSID scans with specific SSID scans to avoid
897 * waiting a long time for a wildcard scan.
898 */
899 if (!wpa_s->prev_scan_wildcard) {
900 params.ssids[0].ssid = NULL;
901 params.ssids[0].ssid_len = 0;
902 wpa_s->prev_scan_wildcard = 1;
903 wpa_dbg(wpa_s, MSG_DEBUG, "Starting AP scan for "
904 "wildcard SSID (Interleave with specific)");
905 } else {
906 wpa_s->prev_scan_ssid = ssid;
907 wpa_s->prev_scan_wildcard = 0;
908 wpa_dbg(wpa_s, MSG_DEBUG,
909 "Starting AP scan for specific SSID: %s",
910 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
911 }
912 } else if (ssid) {
913 /* max_ssids > 1 */
914
915 wpa_s->prev_scan_ssid = ssid;
916 wpa_dbg(wpa_s, MSG_DEBUG, "Include wildcard SSID in "
917 "the scan request");
918 params.num_ssids++;
919 } else if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
920 wpa_s->manual_scan_passive && params.num_ssids == 0) {
921 wpa_dbg(wpa_s, MSG_DEBUG, "Use passive scan based on manual request");
922 } else if (wpa_s->conf->passive_scan) {
923 wpa_dbg(wpa_s, MSG_DEBUG,
924 "Use passive scan based on configuration");
925 } else {
926 wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
927 params.num_ssids++;
928 wpa_dbg(wpa_s, MSG_DEBUG, "Starting AP scan for wildcard "
929 "SSID");
930 }
931
932 ssid_list_set:
933 wpa_supplicant_optimize_freqs(wpa_s, &params);
934 extra_ie = wpa_supplicant_extra_ies(wpa_s);
935
936 if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
937 wpa_s->manual_scan_only_new) {
938 wpa_printf(MSG_DEBUG,
939 "Request driver to clear scan cache due to manual only_new=1 scan");
940 params.only_new_results = 1;
941 }
942
943 if (wpa_s->last_scan_req == MANUAL_SCAN_REQ && params.freqs == NULL &&
944 wpa_s->manual_scan_freqs) {
945 wpa_dbg(wpa_s, MSG_DEBUG, "Limit manual scan to specified channels");
946 params.freqs = wpa_s->manual_scan_freqs;
947 wpa_s->manual_scan_freqs = NULL;
948 }
949
950 if (params.freqs == NULL && wpa_s->next_scan_freqs) {
951 wpa_dbg(wpa_s, MSG_DEBUG, "Optimize scan based on previously "
952 "generated frequency list");
953 params.freqs = wpa_s->next_scan_freqs;
954 } else
955 os_free(wpa_s->next_scan_freqs);
956 wpa_s->next_scan_freqs = NULL;
957 wpa_setband_scan_freqs(wpa_s, &params);
958
959 /* See if user specified frequencies. If so, scan only those. */
960 if (wpa_s->conf->freq_list && !params.freqs) {
961 wpa_dbg(wpa_s, MSG_DEBUG,
962 "Optimize scan based on conf->freq_list");
963 int_array_concat(&params.freqs, wpa_s->conf->freq_list);
964 }
965
966 /* Use current associated channel? */
967 if (wpa_s->conf->scan_cur_freq && !params.freqs) {
968 unsigned int num = wpa_s->num_multichan_concurrent;
969
970 params.freqs = os_calloc(num + 1, sizeof(int));
971 if (params.freqs) {
972 num = get_shared_radio_freqs(wpa_s, params.freqs, num);
973 if (num > 0) {
974 wpa_dbg(wpa_s, MSG_DEBUG, "Scan only the "
975 "current operating channels since "
976 "scan_cur_freq is enabled");
977 } else {
978 os_free(params.freqs);
979 params.freqs = NULL;
980 }
981 }
982 }
983
984 params.filter_ssids = wpa_supplicant_build_filter_ssids(
985 wpa_s->conf, &params.num_filter_ssids);
986 if (extra_ie) {
987 params.extra_ies = wpabuf_head(extra_ie);
988 params.extra_ies_len = wpabuf_len(extra_ie);
989 }
990
991 #ifdef CONFIG_P2P
992 if (wpa_s->p2p_in_provisioning || wpa_s->p2p_in_invitation ||
993 (wpa_s->show_group_started && wpa_s->go_params)) {
994 /*
995 * The interface may not yet be in P2P mode, so we have to
996 * explicitly request P2P probe to disable CCK rates.
997 */
998 params.p2p_probe = 1;
999 }
1000 #endif /* CONFIG_P2P */
1001
1002 if (wpa_s->mac_addr_rand_enable & MAC_ADDR_RAND_SCAN) {
1003 params.mac_addr_rand = 1;
1004 if (wpa_s->mac_addr_scan) {
1005 params.mac_addr = wpa_s->mac_addr_scan;
1006 params.mac_addr_mask = wpa_s->mac_addr_scan + ETH_ALEN;
1007 }
1008 }
1009
1010 scan_params = &params;
1011
1012 scan:
1013 #ifdef CONFIG_P2P
1014 /*
1015 * If the driver does not support multi-channel concurrency and a
1016 * virtual interface that shares the same radio with the wpa_s interface
1017 * is operating there may not be need to scan other channels apart from
1018 * the current operating channel on the other virtual interface. Filter
1019 * out other channels in case we are trying to find a connection for a
1020 * station interface when we are not configured to prefer station
1021 * connection and a concurrent operation is already in process.
1022 */
1023 if (wpa_s->scan_for_connection &&
1024 wpa_s->last_scan_req == NORMAL_SCAN_REQ &&
1025 !scan_params->freqs && !params.freqs &&
1026 wpas_is_p2p_prioritized(wpa_s) &&
1027 wpa_s->p2p_group_interface == NOT_P2P_GROUP_INTERFACE &&
1028 non_p2p_network_enabled(wpa_s)) {
1029 unsigned int num = wpa_s->num_multichan_concurrent;
1030
1031 params.freqs = os_calloc(num + 1, sizeof(int));
1032 if (params.freqs) {
1033 num = get_shared_radio_freqs(wpa_s, params.freqs, num);
1034 if (num > 0 && num == wpa_s->num_multichan_concurrent) {
1035 wpa_dbg(wpa_s, MSG_DEBUG, "Scan only the current operating channels since all channels are already used");
1036 } else {
1037 os_free(params.freqs);
1038 params.freqs = NULL;
1039 }
1040 }
1041 }
1042 #endif /* CONFIG_P2P */
1043
1044 ret = wpa_supplicant_trigger_scan(wpa_s, scan_params);
1045
1046 if (ret && wpa_s->last_scan_req == MANUAL_SCAN_REQ && params.freqs &&
1047 !wpa_s->manual_scan_freqs) {
1048 /* Restore manual_scan_freqs for the next attempt */
1049 wpa_s->manual_scan_freqs = params.freqs;
1050 params.freqs = NULL;
1051 }
1052
1053 wpabuf_free(extra_ie);
1054 os_free(params.freqs);
1055 os_free(params.filter_ssids);
1056
1057 if (ret) {
1058 wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate AP scan");
1059 if (wpa_s->scan_prev_wpa_state != wpa_s->wpa_state)
1060 wpa_supplicant_set_state(wpa_s,
1061 wpa_s->scan_prev_wpa_state);
1062 /* Restore scan_req since we will try to scan again */
1063 wpa_s->scan_req = wpa_s->last_scan_req;
1064 wpa_supplicant_req_scan(wpa_s, 1, 0);
1065 } else {
1066 wpa_s->scan_for_connection = 0;
1067 #ifdef CONFIG_INTERWORKING
1068 wpa_s->interworking_fast_assoc_tried = 0;
1069 #endif /* CONFIG_INTERWORKING */
1070 }
1071 }
1072
1073
1074 void wpa_supplicant_update_scan_int(struct wpa_supplicant *wpa_s, int sec)
1075 {
1076 struct os_reltime remaining, new_int;
1077 int cancelled;
1078
1079 cancelled = eloop_cancel_timeout_one(wpa_supplicant_scan, wpa_s, NULL,
1080 &remaining);
1081
1082 new_int.sec = sec;
1083 new_int.usec = 0;
1084 if (cancelled && os_reltime_before(&remaining, &new_int)) {
1085 new_int.sec = remaining.sec;
1086 new_int.usec = remaining.usec;
1087 }
1088
1089 if (cancelled) {
1090 eloop_register_timeout(new_int.sec, new_int.usec,
1091 wpa_supplicant_scan, wpa_s, NULL);
1092 }
1093 wpa_s->scan_interval = sec;
1094 }
1095
1096
1097 /**
1098 * wpa_supplicant_req_scan - Schedule a scan for neighboring access points
1099 * @wpa_s: Pointer to wpa_supplicant data
1100 * @sec: Number of seconds after which to scan
1101 * @usec: Number of microseconds after which to scan
1102 *
1103 * This function is used to schedule a scan for neighboring access points after
1104 * the specified time.
1105 */
1106 void wpa_supplicant_req_scan(struct wpa_supplicant *wpa_s, int sec, int usec)
1107 {
1108 int res;
1109
1110 if (wpa_s->p2p_mgmt) {
1111 wpa_dbg(wpa_s, MSG_DEBUG,
1112 "Ignore scan request (%d.%06d sec) on p2p_mgmt interface",
1113 sec, usec);
1114 return;
1115 }
1116
1117 res = eloop_deplete_timeout(sec, usec, wpa_supplicant_scan, wpa_s,
1118 NULL);
1119 if (res == 1) {
1120 wpa_dbg(wpa_s, MSG_DEBUG, "Rescheduling scan request: %d.%06d sec",
1121 sec, usec);
1122 } else if (res == 0) {
1123 wpa_dbg(wpa_s, MSG_DEBUG, "Ignore new scan request for %d.%06d sec since an earlier request is scheduled to trigger sooner",
1124 sec, usec);
1125 } else {
1126 wpa_dbg(wpa_s, MSG_DEBUG, "Setting scan request: %d.%06d sec",
1127 sec, usec);
1128 eloop_register_timeout(sec, usec, wpa_supplicant_scan, wpa_s, NULL);
1129 }
1130 }
1131
1132
1133 /**
1134 * wpa_supplicant_delayed_sched_scan - Request a delayed scheduled scan
1135 * @wpa_s: Pointer to wpa_supplicant data
1136 * @sec: Number of seconds after which to scan
1137 * @usec: Number of microseconds after which to scan
1138 * Returns: 0 on success or -1 otherwise
1139 *
1140 * This function is used to schedule periodic scans for neighboring
1141 * access points after the specified time.
1142 */
1143 int wpa_supplicant_delayed_sched_scan(struct wpa_supplicant *wpa_s,
1144 int sec, int usec)
1145 {
1146 if (!wpa_s->sched_scan_supported)
1147 return -1;
1148
1149 eloop_register_timeout(sec, usec,
1150 wpa_supplicant_delayed_sched_scan_timeout,
1151 wpa_s, NULL);
1152
1153 return 0;
1154 }
1155
1156
1157 /**
1158 * wpa_supplicant_req_sched_scan - Start a periodic scheduled scan
1159 * @wpa_s: Pointer to wpa_supplicant data
1160 * Returns: 0 is sched_scan was started or -1 otherwise
1161 *
1162 * This function is used to schedule periodic scans for neighboring
1163 * access points repeating the scan continuously.
1164 */
1165 int wpa_supplicant_req_sched_scan(struct wpa_supplicant *wpa_s)
1166 {
1167 struct wpa_driver_scan_params params;
1168 struct wpa_driver_scan_params *scan_params;
1169 enum wpa_states prev_state;
1170 struct wpa_ssid *ssid = NULL;
1171 struct wpabuf *extra_ie = NULL;
1172 int ret;
1173 unsigned int max_sched_scan_ssids;
1174 int wildcard = 0;
1175 int need_ssids;
1176
1177 if (!wpa_s->sched_scan_supported)
1178 return -1;
1179
1180 if (wpa_s->max_sched_scan_ssids > WPAS_MAX_SCAN_SSIDS)
1181 max_sched_scan_ssids = WPAS_MAX_SCAN_SSIDS;
1182 else
1183 max_sched_scan_ssids = wpa_s->max_sched_scan_ssids;
1184 if (max_sched_scan_ssids < 1 || wpa_s->conf->disable_scan_offload)
1185 return -1;
1186
1187 if (wpa_s->sched_scanning) {
1188 wpa_dbg(wpa_s, MSG_DEBUG, "Already sched scanning");
1189 return 0;
1190 }
1191
1192 need_ssids = 0;
1193 for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
1194 if (!wpas_network_disabled(wpa_s, ssid) && !ssid->scan_ssid) {
1195 /* Use wildcard SSID to find this network */
1196 wildcard = 1;
1197 } else if (!wpas_network_disabled(wpa_s, ssid) &&
1198 ssid->ssid_len)
1199 need_ssids++;
1200
1201 #ifdef CONFIG_WPS
1202 if (!wpas_network_disabled(wpa_s, ssid) &&
1203 ssid->key_mgmt == WPA_KEY_MGMT_WPS) {
1204 /*
1205 * Normal scan is more reliable and faster for WPS
1206 * operations and since these are for short periods of
1207 * time, the benefit of trying to use sched_scan would
1208 * be limited.
1209 */
1210 wpa_dbg(wpa_s, MSG_DEBUG, "Use normal scan instead of "
1211 "sched_scan for WPS");
1212 return -1;
1213 }
1214 #endif /* CONFIG_WPS */
1215 }
1216 if (wildcard)
1217 need_ssids++;
1218
1219 if (wpa_s->normal_scans < 3 &&
1220 (need_ssids <= wpa_s->max_scan_ssids ||
1221 wpa_s->max_scan_ssids >= (int) max_sched_scan_ssids)) {
1222 /*
1223 * When normal scan can speed up operations, use that for the
1224 * first operations before starting the sched_scan to allow
1225 * user space sleep more. We do this only if the normal scan
1226 * has functionality that is suitable for this or if the
1227 * sched_scan does not have better support for multiple SSIDs.
1228 */
1229 wpa_dbg(wpa_s, MSG_DEBUG, "Use normal scan instead of "
1230 "sched_scan for initial scans (normal_scans=%d)",
1231 wpa_s->normal_scans);
1232 return -1;
1233 }
1234
1235 os_memset(&params, 0, sizeof(params));
1236
1237 /* If we can't allocate space for the filters, we just don't filter */
1238 params.filter_ssids = os_calloc(wpa_s->max_match_sets,
1239 sizeof(struct wpa_driver_scan_filter));
1240
1241 prev_state = wpa_s->wpa_state;
1242 if (wpa_s->wpa_state == WPA_DISCONNECTED ||
1243 wpa_s->wpa_state == WPA_INACTIVE)
1244 wpa_supplicant_set_state(wpa_s, WPA_SCANNING);
1245
1246 if (wpa_s->autoscan_params != NULL) {
1247 scan_params = wpa_s->autoscan_params;
1248 goto scan;
1249 }
1250
1251 /* Find the starting point from which to continue scanning */
1252 ssid = wpa_s->conf->ssid;
1253 if (wpa_s->prev_sched_ssid) {
1254 while (ssid) {
1255 if (ssid == wpa_s->prev_sched_ssid) {
1256 ssid = ssid->next;
1257 break;
1258 }
1259 ssid = ssid->next;
1260 }
1261 }
1262
1263 if (!ssid || !wpa_s->prev_sched_ssid) {
1264 wpa_dbg(wpa_s, MSG_DEBUG, "Beginning of SSID list");
1265 if (wpa_s->conf->sched_scan_interval)
1266 wpa_s->sched_scan_interval =
1267 wpa_s->conf->sched_scan_interval;
1268 if (wpa_s->sched_scan_interval == 0)
1269 wpa_s->sched_scan_interval = 10;
1270 wpa_s->sched_scan_timeout = max_sched_scan_ssids * 2;
1271 wpa_s->first_sched_scan = 1;
1272 ssid = wpa_s->conf->ssid;
1273 wpa_s->prev_sched_ssid = ssid;
1274 }
1275
1276 if (wildcard) {
1277 wpa_dbg(wpa_s, MSG_DEBUG, "Add wildcard SSID to sched_scan");
1278 params.num_ssids++;
1279 }
1280
1281 while (ssid) {
1282 if (wpas_network_disabled(wpa_s, ssid))
1283 goto next;
1284
1285 if (params.num_filter_ssids < wpa_s->max_match_sets &&
1286 params.filter_ssids && ssid->ssid && ssid->ssid_len) {
1287 wpa_dbg(wpa_s, MSG_DEBUG, "add to filter ssid: %s",
1288 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
1289 os_memcpy(params.filter_ssids[params.num_filter_ssids].ssid,
1290 ssid->ssid, ssid->ssid_len);
1291 params.filter_ssids[params.num_filter_ssids].ssid_len =
1292 ssid->ssid_len;
1293 params.num_filter_ssids++;
1294 } else if (params.filter_ssids && ssid->ssid && ssid->ssid_len)
1295 {
1296 wpa_dbg(wpa_s, MSG_DEBUG, "Not enough room for SSID "
1297 "filter for sched_scan - drop filter");
1298 os_free(params.filter_ssids);
1299 params.filter_ssids = NULL;
1300 params.num_filter_ssids = 0;
1301 }
1302
1303 if (ssid->scan_ssid && ssid->ssid && ssid->ssid_len) {
1304 if (params.num_ssids == max_sched_scan_ssids)
1305 break; /* only room for broadcast SSID */
1306 wpa_dbg(wpa_s, MSG_DEBUG,
1307 "add to active scan ssid: %s",
1308 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
1309 params.ssids[params.num_ssids].ssid =
1310 ssid->ssid;
1311 params.ssids[params.num_ssids].ssid_len =
1312 ssid->ssid_len;
1313 params.num_ssids++;
1314 if (params.num_ssids >= max_sched_scan_ssids) {
1315 wpa_s->prev_sched_ssid = ssid;
1316 do {
1317 ssid = ssid->next;
1318 } while (ssid &&
1319 (wpas_network_disabled(wpa_s, ssid) ||
1320 !ssid->scan_ssid));
1321 break;
1322 }
1323 }
1324
1325 next:
1326 wpa_s->prev_sched_ssid = ssid;
1327 ssid = ssid->next;
1328 }
1329
1330 if (params.num_filter_ssids == 0) {
1331 os_free(params.filter_ssids);
1332 params.filter_ssids = NULL;
1333 }
1334
1335 extra_ie = wpa_supplicant_extra_ies(wpa_s);
1336 if (extra_ie) {
1337 params.extra_ies = wpabuf_head(extra_ie);
1338 params.extra_ies_len = wpabuf_len(extra_ie);
1339 }
1340
1341 if (wpa_s->conf->filter_rssi)
1342 params.filter_rssi = wpa_s->conf->filter_rssi;
1343
1344 /* See if user specified frequencies. If so, scan only those. */
1345 if (wpa_s->conf->freq_list && !params.freqs) {
1346 wpa_dbg(wpa_s, MSG_DEBUG,
1347 "Optimize scan based on conf->freq_list");
1348 int_array_concat(&params.freqs, wpa_s->conf->freq_list);
1349 }
1350
1351 scan_params = &params;
1352
1353 scan:
1354 if (ssid || !wpa_s->first_sched_scan) {
1355 wpa_dbg(wpa_s, MSG_DEBUG,
1356 "Starting sched scan: interval %d timeout %d",
1357 wpa_s->sched_scan_interval, wpa_s->sched_scan_timeout);
1358 } else {
1359 wpa_dbg(wpa_s, MSG_DEBUG,
1360 "Starting sched scan: interval %d (no timeout)",
1361 wpa_s->sched_scan_interval);
1362 }
1363
1364 wpa_setband_scan_freqs(wpa_s, scan_params);
1365
1366 if (wpa_s->mac_addr_rand_enable & MAC_ADDR_RAND_SCHED_SCAN) {
1367 params.mac_addr_rand = 1;
1368 if (wpa_s->mac_addr_sched_scan) {
1369 params.mac_addr = wpa_s->mac_addr_sched_scan;
1370 params.mac_addr_mask = wpa_s->mac_addr_sched_scan +
1371 ETH_ALEN;
1372 }
1373 }
1374
1375 ret = wpa_supplicant_start_sched_scan(wpa_s, scan_params,
1376 wpa_s->sched_scan_interval);
1377 wpabuf_free(extra_ie);
1378 os_free(params.filter_ssids);
1379 if (ret) {
1380 wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate sched scan");
1381 if (prev_state != wpa_s->wpa_state)
1382 wpa_supplicant_set_state(wpa_s, prev_state);
1383 return ret;
1384 }
1385
1386 /* If we have more SSIDs to scan, add a timeout so we scan them too */
1387 if (ssid || !wpa_s->first_sched_scan) {
1388 wpa_s->sched_scan_timed_out = 0;
1389 eloop_register_timeout(wpa_s->sched_scan_timeout, 0,
1390 wpa_supplicant_sched_scan_timeout,
1391 wpa_s, NULL);
1392 wpa_s->first_sched_scan = 0;
1393 wpa_s->sched_scan_timeout /= 2;
1394 wpa_s->sched_scan_interval *= 2;
1395 if (wpa_s->sched_scan_timeout < wpa_s->sched_scan_interval) {
1396 wpa_s->sched_scan_interval = 10;
1397 wpa_s->sched_scan_timeout = max_sched_scan_ssids * 2;
1398 }
1399 }
1400
1401 /* If there is no more ssids, start next time from the beginning */
1402 if (!ssid)
1403 wpa_s->prev_sched_ssid = NULL;
1404
1405 return 0;
1406 }
1407
1408
1409 /**
1410 * wpa_supplicant_cancel_scan - Cancel a scheduled scan request
1411 * @wpa_s: Pointer to wpa_supplicant data
1412 *
1413 * This function is used to cancel a scan request scheduled with
1414 * wpa_supplicant_req_scan().
1415 */
1416 void wpa_supplicant_cancel_scan(struct wpa_supplicant *wpa_s)
1417 {
1418 wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling scan request");
1419 eloop_cancel_timeout(wpa_supplicant_scan, wpa_s, NULL);
1420 }
1421
1422
1423 /**
1424 * wpa_supplicant_cancel_delayed_sched_scan - Stop a delayed scheduled scan
1425 * @wpa_s: Pointer to wpa_supplicant data
1426 *
1427 * This function is used to stop a delayed scheduled scan.
1428 */
1429 void wpa_supplicant_cancel_delayed_sched_scan(struct wpa_supplicant *wpa_s)
1430 {
1431 if (!wpa_s->sched_scan_supported)
1432 return;
1433
1434 wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling delayed sched scan");
1435 eloop_cancel_timeout(wpa_supplicant_delayed_sched_scan_timeout,
1436 wpa_s, NULL);
1437 }
1438
1439
1440 /**
1441 * wpa_supplicant_cancel_sched_scan - Stop running scheduled scans
1442 * @wpa_s: Pointer to wpa_supplicant data
1443 *
1444 * This function is used to stop a periodic scheduled scan.
1445 */
1446 void wpa_supplicant_cancel_sched_scan(struct wpa_supplicant *wpa_s)
1447 {
1448 if (!wpa_s->sched_scanning)
1449 return;
1450
1451 wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling sched scan");
1452 eloop_cancel_timeout(wpa_supplicant_sched_scan_timeout, wpa_s, NULL);
1453 wpa_supplicant_stop_sched_scan(wpa_s);
1454 }
1455
1456
1457 /**
1458 * wpa_supplicant_notify_scanning - Indicate possible scan state change
1459 * @wpa_s: Pointer to wpa_supplicant data
1460 * @scanning: Whether scanning is currently in progress
1461 *
1462 * This function is to generate scanning notifycations. It is called whenever
1463 * there may have been a change in scanning (scan started, completed, stopped).
1464 * wpas_notify_scanning() is called whenever the scanning state changed from the
1465 * previously notified state.
1466 */
1467 void wpa_supplicant_notify_scanning(struct wpa_supplicant *wpa_s,
1468 int scanning)
1469 {
1470 if (wpa_s->scanning != scanning) {
1471 wpa_s->scanning = scanning;
1472 wpas_notify_scanning(wpa_s);
1473 }
1474 }
1475
1476
1477 static int wpa_scan_get_max_rate(const struct wpa_scan_res *res)
1478 {
1479 int rate = 0;
1480 const u8 *ie;
1481 int i;
1482
1483 ie = wpa_scan_get_ie(res, WLAN_EID_SUPP_RATES);
1484 for (i = 0; ie && i < ie[1]; i++) {
1485 if ((ie[i + 2] & 0x7f) > rate)
1486 rate = ie[i + 2] & 0x7f;
1487 }
1488
1489 ie = wpa_scan_get_ie(res, WLAN_EID_EXT_SUPP_RATES);
1490 for (i = 0; ie && i < ie[1]; i++) {
1491 if ((ie[i + 2] & 0x7f) > rate)
1492 rate = ie[i + 2] & 0x7f;
1493 }
1494
1495 return rate;
1496 }
1497
1498
1499 /**
1500 * wpa_scan_get_ie - Fetch a specified information element from a scan result
1501 * @res: Scan result entry
1502 * @ie: Information element identitifier (WLAN_EID_*)
1503 * Returns: Pointer to the information element (id field) or %NULL if not found
1504 *
1505 * This function returns the first matching information element in the scan
1506 * result.
1507 */
1508 const u8 * wpa_scan_get_ie(const struct wpa_scan_res *res, u8 ie)
1509 {
1510 const u8 *end, *pos;
1511
1512 pos = (const u8 *) (res + 1);
1513 end = pos + res->ie_len;
1514
1515 while (pos + 1 < end) {
1516 if (pos + 2 + pos[1] > end)
1517 break;
1518 if (pos[0] == ie)
1519 return pos;
1520 pos += 2 + pos[1];
1521 }
1522
1523 return NULL;
1524 }
1525
1526
1527 /**
1528 * wpa_scan_get_vendor_ie - Fetch vendor information element from a scan result
1529 * @res: Scan result entry
1530 * @vendor_type: Vendor type (four octets starting the IE payload)
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_vendor_ie(const struct wpa_scan_res *res,
1537 u32 vendor_type)
1538 {
1539 const u8 *end, *pos;
1540
1541 pos = (const u8 *) (res + 1);
1542 end = pos + res->ie_len;
1543
1544 while (pos + 1 < end) {
1545 if (pos + 2 + pos[1] > end)
1546 break;
1547 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1548 vendor_type == WPA_GET_BE32(&pos[2]))
1549 return pos;
1550 pos += 2 + pos[1];
1551 }
1552
1553 return NULL;
1554 }
1555
1556
1557 /**
1558 * wpa_scan_get_vendor_ie_beacon - Fetch vendor information from a scan result
1559 * @res: Scan result entry
1560 * @vendor_type: Vendor type (four octets starting the IE payload)
1561 * Returns: Pointer to the information element (id field) or %NULL if not found
1562 *
1563 * This function returns the first matching information element in the scan
1564 * result.
1565 *
1566 * This function is like wpa_scan_get_vendor_ie(), but uses IE buffer only
1567 * from Beacon frames instead of either Beacon or Probe Response frames.
1568 */
1569 const u8 * wpa_scan_get_vendor_ie_beacon(const struct wpa_scan_res *res,
1570 u32 vendor_type)
1571 {
1572 const u8 *end, *pos;
1573
1574 if (res->beacon_ie_len == 0)
1575 return NULL;
1576
1577 pos = (const u8 *) (res + 1);
1578 pos += res->ie_len;
1579 end = pos + res->beacon_ie_len;
1580
1581 while (pos + 1 < end) {
1582 if (pos + 2 + pos[1] > end)
1583 break;
1584 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1585 vendor_type == WPA_GET_BE32(&pos[2]))
1586 return pos;
1587 pos += 2 + pos[1];
1588 }
1589
1590 return NULL;
1591 }
1592
1593
1594 /**
1595 * wpa_scan_get_vendor_ie_multi - Fetch vendor IE data from a scan result
1596 * @res: Scan result entry
1597 * @vendor_type: Vendor type (four octets starting the IE payload)
1598 * Returns: Pointer to the information element payload or %NULL if not found
1599 *
1600 * This function returns concatenated payload of possibly fragmented vendor
1601 * specific information elements in the scan result. The caller is responsible
1602 * for freeing the returned buffer.
1603 */
1604 struct wpabuf * wpa_scan_get_vendor_ie_multi(const struct wpa_scan_res *res,
1605 u32 vendor_type)
1606 {
1607 struct wpabuf *buf;
1608 const u8 *end, *pos;
1609
1610 buf = wpabuf_alloc(res->ie_len);
1611 if (buf == NULL)
1612 return NULL;
1613
1614 pos = (const u8 *) (res + 1);
1615 end = pos + res->ie_len;
1616
1617 while (pos + 1 < end) {
1618 if (pos + 2 + pos[1] > end)
1619 break;
1620 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1621 vendor_type == WPA_GET_BE32(&pos[2]))
1622 wpabuf_put_data(buf, pos + 2 + 4, pos[1] - 4);
1623 pos += 2 + pos[1];
1624 }
1625
1626 if (wpabuf_len(buf) == 0) {
1627 wpabuf_free(buf);
1628 buf = NULL;
1629 }
1630
1631 return buf;
1632 }
1633
1634
1635 /*
1636 * Channels with a great SNR can operate at full rate. What is a great SNR?
1637 * This doc https://supportforums.cisco.com/docs/DOC-12954 says, "the general
1638 * rule of thumb is that any SNR above 20 is good." This one
1639 * http://www.cisco.com/en/US/tech/tk722/tk809/technologies_q_and_a_item09186a00805e9a96.shtml#qa23
1640 * recommends 25 as a minimum SNR for 54 Mbps data rate. 30 is chosen here as a
1641 * conservative value.
1642 */
1643 #define GREAT_SNR 30
1644
1645 #define IS_5GHZ(n) (n > 4000)
1646
1647 /* Compare function for sorting scan results. Return >0 if @b is considered
1648 * better. */
1649 static int wpa_scan_result_compar(const void *a, const void *b)
1650 {
1651 #define MIN(a,b) a < b ? a : b
1652 struct wpa_scan_res **_wa = (void *) a;
1653 struct wpa_scan_res **_wb = (void *) b;
1654 struct wpa_scan_res *wa = *_wa;
1655 struct wpa_scan_res *wb = *_wb;
1656 int wpa_a, wpa_b;
1657 int snr_a, snr_b, snr_a_full, snr_b_full;
1658
1659 /* WPA/WPA2 support preferred */
1660 wpa_a = wpa_scan_get_vendor_ie(wa, WPA_IE_VENDOR_TYPE) != NULL ||
1661 wpa_scan_get_ie(wa, WLAN_EID_RSN) != NULL;
1662 wpa_b = wpa_scan_get_vendor_ie(wb, WPA_IE_VENDOR_TYPE) != NULL ||
1663 wpa_scan_get_ie(wb, WLAN_EID_RSN) != NULL;
1664
1665 if (wpa_b && !wpa_a)
1666 return 1;
1667 if (!wpa_b && wpa_a)
1668 return -1;
1669
1670 /* privacy support preferred */
1671 if ((wa->caps & IEEE80211_CAP_PRIVACY) == 0 &&
1672 (wb->caps & IEEE80211_CAP_PRIVACY))
1673 return 1;
1674 if ((wa->caps & IEEE80211_CAP_PRIVACY) &&
1675 (wb->caps & IEEE80211_CAP_PRIVACY) == 0)
1676 return -1;
1677
1678 if (wa->flags & wb->flags & WPA_SCAN_LEVEL_DBM) {
1679 snr_a_full = wa->snr;
1680 snr_a = MIN(wa->snr, GREAT_SNR);
1681 snr_b_full = wb->snr;
1682 snr_b = MIN(wa->snr, GREAT_SNR);
1683 } else {
1684 /* Level is not in dBm, so we can't calculate
1685 * SNR. Just use raw level (units unknown). */
1686 snr_a = snr_a_full = wa->level;
1687 snr_b = snr_b_full = wb->level;
1688 }
1689
1690 /* if SNR is close, decide by max rate or frequency band */
1691 if ((snr_a && snr_b && abs(snr_b - snr_a) < 5) ||
1692 (wa->qual && wb->qual && abs(wb->qual - wa->qual) < 10)) {
1693 if (wa->est_throughput != wb->est_throughput)
1694 return wb->est_throughput - wa->est_throughput;
1695 if (IS_5GHZ(wa->freq) ^ IS_5GHZ(wb->freq))
1696 return IS_5GHZ(wa->freq) ? -1 : 1;
1697 }
1698
1699 /* all things being equal, use SNR; if SNRs are
1700 * identical, use quality values since some drivers may only report
1701 * that value and leave the signal level zero */
1702 if (snr_b_full == snr_a_full)
1703 return wb->qual - wa->qual;
1704 return snr_b_full - snr_a_full;
1705 #undef MIN
1706 }
1707
1708
1709 #ifdef CONFIG_WPS
1710 /* Compare function for sorting scan results when searching a WPS AP for
1711 * provisioning. Return >0 if @b is considered better. */
1712 static int wpa_scan_result_wps_compar(const void *a, const void *b)
1713 {
1714 struct wpa_scan_res **_wa = (void *) a;
1715 struct wpa_scan_res **_wb = (void *) b;
1716 struct wpa_scan_res *wa = *_wa;
1717 struct wpa_scan_res *wb = *_wb;
1718 int uses_wps_a, uses_wps_b;
1719 struct wpabuf *wps_a, *wps_b;
1720 int res;
1721
1722 /* Optimization - check WPS IE existence before allocated memory and
1723 * doing full reassembly. */
1724 uses_wps_a = wpa_scan_get_vendor_ie(wa, WPS_IE_VENDOR_TYPE) != NULL;
1725 uses_wps_b = wpa_scan_get_vendor_ie(wb, WPS_IE_VENDOR_TYPE) != NULL;
1726 if (uses_wps_a && !uses_wps_b)
1727 return -1;
1728 if (!uses_wps_a && uses_wps_b)
1729 return 1;
1730
1731 if (uses_wps_a && uses_wps_b) {
1732 wps_a = wpa_scan_get_vendor_ie_multi(wa, WPS_IE_VENDOR_TYPE);
1733 wps_b = wpa_scan_get_vendor_ie_multi(wb, WPS_IE_VENDOR_TYPE);
1734 res = wps_ap_priority_compar(wps_a, wps_b);
1735 wpabuf_free(wps_a);
1736 wpabuf_free(wps_b);
1737 if (res)
1738 return res;
1739 }
1740
1741 /*
1742 * Do not use current AP security policy as a sorting criteria during
1743 * WPS provisioning step since the AP may get reconfigured at the
1744 * completion of provisioning.
1745 */
1746
1747 /* all things being equal, use signal level; if signal levels are
1748 * identical, use quality values since some drivers may only report
1749 * that value and leave the signal level zero */
1750 if (wb->level == wa->level)
1751 return wb->qual - wa->qual;
1752 return wb->level - wa->level;
1753 }
1754 #endif /* CONFIG_WPS */
1755
1756
1757 static void dump_scan_res(struct wpa_scan_results *scan_res)
1758 {
1759 #ifndef CONFIG_NO_STDOUT_DEBUG
1760 size_t i;
1761
1762 if (scan_res->res == NULL || scan_res->num == 0)
1763 return;
1764
1765 wpa_printf(MSG_EXCESSIVE, "Sorted scan results");
1766
1767 for (i = 0; i < scan_res->num; i++) {
1768 struct wpa_scan_res *r = scan_res->res[i];
1769 u8 *pos;
1770 if (r->flags & WPA_SCAN_LEVEL_DBM) {
1771 int noise_valid = !(r->flags & WPA_SCAN_NOISE_INVALID);
1772
1773 wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d "
1774 "noise=%d%s level=%d snr=%d%s flags=0x%x age=%u est=%u",
1775 MAC2STR(r->bssid), r->freq, r->qual,
1776 r->noise, noise_valid ? "" : "~", r->level,
1777 r->snr, r->snr >= GREAT_SNR ? "*" : "",
1778 r->flags,
1779 r->age, r->est_throughput);
1780 } else {
1781 wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d "
1782 "noise=%d level=%d flags=0x%x age=%u est=%u",
1783 MAC2STR(r->bssid), r->freq, r->qual,
1784 r->noise, r->level, r->flags, r->age,
1785 r->est_throughput);
1786 }
1787 pos = (u8 *) (r + 1);
1788 if (r->ie_len)
1789 wpa_hexdump(MSG_EXCESSIVE, "IEs", pos, r->ie_len);
1790 pos += r->ie_len;
1791 if (r->beacon_ie_len)
1792 wpa_hexdump(MSG_EXCESSIVE, "Beacon IEs",
1793 pos, r->beacon_ie_len);
1794 }
1795 #endif /* CONFIG_NO_STDOUT_DEBUG */
1796 }
1797
1798
1799 /**
1800 * wpa_supplicant_filter_bssid_match - Is the specified BSSID allowed
1801 * @wpa_s: Pointer to wpa_supplicant data
1802 * @bssid: BSSID to check
1803 * Returns: 0 if the BSSID is filtered or 1 if not
1804 *
1805 * This function is used to filter out specific BSSIDs from scan reslts mainly
1806 * for testing purposes (SET bssid_filter ctrl_iface command).
1807 */
1808 int wpa_supplicant_filter_bssid_match(struct wpa_supplicant *wpa_s,
1809 const u8 *bssid)
1810 {
1811 size_t i;
1812
1813 if (wpa_s->bssid_filter == NULL)
1814 return 1;
1815
1816 for (i = 0; i < wpa_s->bssid_filter_count; i++) {
1817 if (os_memcmp(wpa_s->bssid_filter + i * ETH_ALEN, bssid,
1818 ETH_ALEN) == 0)
1819 return 1;
1820 }
1821
1822 return 0;
1823 }
1824
1825
1826 static void filter_scan_res(struct wpa_supplicant *wpa_s,
1827 struct wpa_scan_results *res)
1828 {
1829 size_t i, j;
1830
1831 if (wpa_s->bssid_filter == NULL)
1832 return;
1833
1834 for (i = 0, j = 0; i < res->num; i++) {
1835 if (wpa_supplicant_filter_bssid_match(wpa_s,
1836 res->res[i]->bssid)) {
1837 res->res[j++] = res->res[i];
1838 } else {
1839 os_free(res->res[i]);
1840 res->res[i] = NULL;
1841 }
1842 }
1843
1844 if (res->num != j) {
1845 wpa_printf(MSG_DEBUG, "Filtered out %d scan results",
1846 (int) (res->num - j));
1847 res->num = j;
1848 }
1849 }
1850
1851
1852 /*
1853 * Noise floor values to use when we have signal strength
1854 * measurements, but no noise floor measurments. These values were
1855 * measured in an office environment with many APs.
1856 */
1857 #define DEFAULT_NOISE_FLOOR_2GHZ (-89)
1858 #define DEFAULT_NOISE_FLOOR_5GHZ (-92)
1859
1860 static void scan_snr(struct wpa_scan_res *res)
1861 {
1862 if (res->flags & WPA_SCAN_NOISE_INVALID) {
1863 res->noise = IS_5GHZ(res->freq) ?
1864 DEFAULT_NOISE_FLOOR_5GHZ :
1865 DEFAULT_NOISE_FLOOR_2GHZ;
1866 }
1867
1868 if (res->flags & WPA_SCAN_LEVEL_DBM) {
1869 res->snr = res->level - res->noise;
1870 } else {
1871 /* Level is not in dBm, so we can't calculate
1872 * SNR. Just use raw level (units unknown). */
1873 res->snr = res->level;
1874 }
1875 }
1876
1877
1878 static unsigned int max_ht20_rate(int snr)
1879 {
1880 if (snr < 6)
1881 return 6500; /* HT20 MCS0 */
1882 if (snr < 8)
1883 return 13000; /* HT20 MCS1 */
1884 if (snr < 13)
1885 return 19500; /* HT20 MCS2 */
1886 if (snr < 17)
1887 return 26000; /* HT20 MCS3 */
1888 if (snr < 20)
1889 return 39000; /* HT20 MCS4 */
1890 if (snr < 23)
1891 return 52000; /* HT20 MCS5 */
1892 if (snr < 24)
1893 return 58500; /* HT20 MCS6 */
1894 return 65000; /* HT20 MCS7 */
1895 }
1896
1897
1898 static unsigned int max_ht40_rate(int snr)
1899 {
1900 if (snr < 3)
1901 return 13500; /* HT40 MCS0 */
1902 if (snr < 6)
1903 return 27000; /* HT40 MCS1 */
1904 if (snr < 10)
1905 return 40500; /* HT40 MCS2 */
1906 if (snr < 15)
1907 return 54000; /* HT40 MCS3 */
1908 if (snr < 17)
1909 return 81000; /* HT40 MCS4 */
1910 if (snr < 22)
1911 return 108000; /* HT40 MCS5 */
1912 if (snr < 24)
1913 return 121500; /* HT40 MCS6 */
1914 return 135000; /* HT40 MCS7 */
1915 }
1916
1917
1918 static unsigned int max_vht80_rate(int snr)
1919 {
1920 if (snr < 1)
1921 return 0;
1922 if (snr < 2)
1923 return 29300; /* VHT80 MCS0 */
1924 if (snr < 5)
1925 return 58500; /* VHT80 MCS1 */
1926 if (snr < 9)
1927 return 87800; /* VHT80 MCS2 */
1928 if (snr < 11)
1929 return 117000; /* VHT80 MCS3 */
1930 if (snr < 15)
1931 return 175500; /* VHT80 MCS4 */
1932 if (snr < 16)
1933 return 234000; /* VHT80 MCS5 */
1934 if (snr < 18)
1935 return 263300; /* VHT80 MCS6 */
1936 if (snr < 20)
1937 return 292500; /* VHT80 MCS7 */
1938 if (snr < 22)
1939 return 351000; /* VHT80 MCS8 */
1940 return 390000; /* VHT80 MCS9 */
1941 }
1942
1943
1944 static void scan_est_throughput(struct wpa_supplicant *wpa_s,
1945 struct wpa_scan_res *res)
1946 {
1947 enum local_hw_capab capab = wpa_s->hw_capab;
1948 int rate; /* max legacy rate in 500 kb/s units */
1949 const u8 *ie;
1950 unsigned int est, tmp;
1951 int snr = res->snr;
1952
1953 if (res->est_throughput)
1954 return;
1955
1956 /* Get maximum legacy rate */
1957 rate = wpa_scan_get_max_rate(res);
1958
1959 /* Limit based on estimated SNR */
1960 if (rate > 1 * 2 && snr < 1)
1961 rate = 1 * 2;
1962 else if (rate > 2 * 2 && snr < 4)
1963 rate = 2 * 2;
1964 else if (rate > 6 * 2 && snr < 5)
1965 rate = 6 * 2;
1966 else if (rate > 9 * 2 && snr < 6)
1967 rate = 9 * 2;
1968 else if (rate > 12 * 2 && snr < 7)
1969 rate = 12 * 2;
1970 else if (rate > 18 * 2 && snr < 10)
1971 rate = 18 * 2;
1972 else if (rate > 24 * 2 && snr < 11)
1973 rate = 24 * 2;
1974 else if (rate > 36 * 2 && snr < 15)
1975 rate = 36 * 2;
1976 else if (rate > 48 * 2 && snr < 19)
1977 rate = 48 * 2;
1978 else if (rate > 54 * 2 && snr < 21)
1979 rate = 54 * 2;
1980 est = rate * 500;
1981
1982 if (capab == CAPAB_HT || capab == CAPAB_HT40 || capab == CAPAB_VHT) {
1983 ie = wpa_scan_get_ie(res, WLAN_EID_HT_CAP);
1984 if (ie) {
1985 tmp = max_ht20_rate(snr);
1986 if (tmp > est)
1987 est = tmp;
1988 }
1989 }
1990
1991 if (capab == CAPAB_HT40 || capab == CAPAB_VHT) {
1992 ie = wpa_scan_get_ie(res, WLAN_EID_HT_OPERATION);
1993 if (ie && ie[1] >= 2 &&
1994 (ie[3] & HT_INFO_HT_PARAM_SECONDARY_CHNL_OFF_MASK)) {
1995 tmp = max_ht40_rate(snr);
1996 if (tmp > est)
1997 est = tmp;
1998 }
1999 }
2000
2001 if (capab == CAPAB_VHT) {
2002 /* Use +1 to assume VHT is always faster than HT */
2003 ie = wpa_scan_get_ie(res, WLAN_EID_VHT_CAP);
2004 if (ie) {
2005 tmp = max_ht20_rate(snr) + 1;
2006 if (tmp > est)
2007 est = tmp;
2008
2009 ie = wpa_scan_get_ie(res, WLAN_EID_HT_OPERATION);
2010 if (ie && ie[1] >= 2 &&
2011 (ie[3] &
2012 HT_INFO_HT_PARAM_SECONDARY_CHNL_OFF_MASK)) {
2013 tmp = max_ht40_rate(snr) + 1;
2014 if (tmp > est)
2015 est = tmp;
2016 }
2017
2018 ie = wpa_scan_get_ie(res, WLAN_EID_VHT_OPERATION);
2019 if (ie && ie[1] >= 1 &&
2020 (ie[2] & VHT_OPMODE_CHANNEL_WIDTH_MASK)) {
2021 tmp = max_vht80_rate(snr) + 1;
2022 if (tmp > est)
2023 est = tmp;
2024 }
2025 }
2026 }
2027
2028 /* TODO: channel utilization and AP load (e.g., from AP Beacon) */
2029
2030 res->est_throughput = est;
2031 }
2032
2033
2034 /**
2035 * wpa_supplicant_get_scan_results - Get scan results
2036 * @wpa_s: Pointer to wpa_supplicant data
2037 * @info: Information about what was scanned or %NULL if not available
2038 * @new_scan: Whether a new scan was performed
2039 * Returns: Scan results, %NULL on failure
2040 *
2041 * This function request the current scan results from the driver and updates
2042 * the local BSS list wpa_s->bss. The caller is responsible for freeing the
2043 * results with wpa_scan_results_free().
2044 */
2045 struct wpa_scan_results *
2046 wpa_supplicant_get_scan_results(struct wpa_supplicant *wpa_s,
2047 struct scan_info *info, int new_scan)
2048 {
2049 struct wpa_scan_results *scan_res;
2050 size_t i;
2051 int (*compar)(const void *, const void *) = wpa_scan_result_compar;
2052
2053 scan_res = wpa_drv_get_scan_results2(wpa_s);
2054 if (scan_res == NULL) {
2055 wpa_dbg(wpa_s, MSG_DEBUG, "Failed to get scan results");
2056 return NULL;
2057 }
2058 if (scan_res->fetch_time.sec == 0) {
2059 /*
2060 * Make sure we have a valid timestamp if the driver wrapper
2061 * does not set this.
2062 */
2063 os_get_reltime(&scan_res->fetch_time);
2064 }
2065 filter_scan_res(wpa_s, scan_res);
2066
2067 for (i = 0; i < scan_res->num; i++) {
2068 struct wpa_scan_res *scan_res_item = scan_res->res[i];
2069
2070 scan_snr(scan_res_item);
2071 scan_est_throughput(wpa_s, scan_res_item);
2072 }
2073
2074 #ifdef CONFIG_WPS
2075 if (wpas_wps_searching(wpa_s)) {
2076 wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Order scan results with WPS "
2077 "provisioning rules");
2078 compar = wpa_scan_result_wps_compar;
2079 }
2080 #endif /* CONFIG_WPS */
2081
2082 qsort(scan_res->res, scan_res->num, sizeof(struct wpa_scan_res *),
2083 compar);
2084 dump_scan_res(scan_res);
2085
2086 wpa_bss_update_start(wpa_s);
2087 for (i = 0; i < scan_res->num; i++)
2088 wpa_bss_update_scan_res(wpa_s, scan_res->res[i],
2089 &scan_res->fetch_time);
2090 wpa_bss_update_end(wpa_s, info, new_scan);
2091
2092 return scan_res;
2093 }
2094
2095
2096 /**
2097 * wpa_supplicant_update_scan_results - Update scan results from the driver
2098 * @wpa_s: Pointer to wpa_supplicant data
2099 * Returns: 0 on success, -1 on failure
2100 *
2101 * This function updates the BSS table within wpa_supplicant based on the
2102 * currently available scan results from the driver without requesting a new
2103 * scan. This is used in cases where the driver indicates an association
2104 * (including roaming within ESS) and wpa_supplicant does not yet have the
2105 * needed information to complete the connection (e.g., to perform validation
2106 * steps in 4-way handshake).
2107 */
2108 int wpa_supplicant_update_scan_results(struct wpa_supplicant *wpa_s)
2109 {
2110 struct wpa_scan_results *scan_res;
2111 scan_res = wpa_supplicant_get_scan_results(wpa_s, NULL, 0);
2112 if (scan_res == NULL)
2113 return -1;
2114 wpa_scan_results_free(scan_res);
2115
2116 return 0;
2117 }
2118
2119
2120 /**
2121 * scan_only_handler - Reports scan results
2122 */
2123 void scan_only_handler(struct wpa_supplicant *wpa_s,
2124 struct wpa_scan_results *scan_res)
2125 {
2126 wpa_dbg(wpa_s, MSG_DEBUG, "Scan-only results received");
2127 if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
2128 wpa_s->manual_scan_use_id && wpa_s->own_scan_running) {
2129 wpa_msg_ctrl(wpa_s, MSG_INFO, WPA_EVENT_SCAN_RESULTS "id=%u",
2130 wpa_s->manual_scan_id);
2131 wpa_s->manual_scan_use_id = 0;
2132 } else {
2133 wpa_msg_ctrl(wpa_s, MSG_INFO, WPA_EVENT_SCAN_RESULTS);
2134 }
2135 wpas_notify_scan_results(wpa_s);
2136 wpas_notify_scan_done(wpa_s, 1);
2137 if (wpa_s->scan_work) {
2138 struct wpa_radio_work *work = wpa_s->scan_work;
2139 wpa_s->scan_work = NULL;
2140 radio_work_done(work);
2141 }
2142 }
2143
2144
2145 int wpas_scan_scheduled(struct wpa_supplicant *wpa_s)
2146 {
2147 return eloop_is_timeout_registered(wpa_supplicant_scan, wpa_s, NULL);
2148 }
2149
2150
2151 struct wpa_driver_scan_params *
2152 wpa_scan_clone_params(const struct wpa_driver_scan_params *src)
2153 {
2154 struct wpa_driver_scan_params *params;
2155 size_t i;
2156 u8 *n;
2157
2158 params = os_zalloc(sizeof(*params));
2159 if (params == NULL)
2160 return NULL;
2161
2162 for (i = 0; i < src->num_ssids; i++) {
2163 if (src->ssids[i].ssid) {
2164 n = os_malloc(src->ssids[i].ssid_len);
2165 if (n == NULL)
2166 goto failed;
2167 os_memcpy(n, src->ssids[i].ssid,
2168 src->ssids[i].ssid_len);
2169 params->ssids[i].ssid = n;
2170 params->ssids[i].ssid_len = src->ssids[i].ssid_len;
2171 }
2172 }
2173 params->num_ssids = src->num_ssids;
2174
2175 if (src->extra_ies) {
2176 n = os_malloc(src->extra_ies_len);
2177 if (n == NULL)
2178 goto failed;
2179 os_memcpy(n, src->extra_ies, src->extra_ies_len);
2180 params->extra_ies = n;
2181 params->extra_ies_len = src->extra_ies_len;
2182 }
2183
2184 if (src->freqs) {
2185 int len = int_array_len(src->freqs);
2186 params->freqs = os_malloc((len + 1) * sizeof(int));
2187 if (params->freqs == NULL)
2188 goto failed;
2189 os_memcpy(params->freqs, src->freqs, (len + 1) * sizeof(int));
2190 }
2191
2192 if (src->filter_ssids) {
2193 params->filter_ssids = os_malloc(sizeof(*params->filter_ssids) *
2194 src->num_filter_ssids);
2195 if (params->filter_ssids == NULL)
2196 goto failed;
2197 os_memcpy(params->filter_ssids, src->filter_ssids,
2198 sizeof(*params->filter_ssids) *
2199 src->num_filter_ssids);
2200 params->num_filter_ssids = src->num_filter_ssids;
2201 }
2202
2203 params->filter_rssi = src->filter_rssi;
2204 params->p2p_probe = src->p2p_probe;
2205 params->only_new_results = src->only_new_results;
2206 params->low_priority = src->low_priority;
2207
2208 if (src->mac_addr_rand) {
2209 params->mac_addr_rand = src->mac_addr_rand;
2210
2211 if (src->mac_addr && src->mac_addr_mask) {
2212 u8 *mac_addr;
2213
2214 mac_addr = os_malloc(2 * ETH_ALEN);
2215 if (!mac_addr)
2216 goto failed;
2217
2218 os_memcpy(mac_addr, src->mac_addr, ETH_ALEN);
2219 os_memcpy(mac_addr + ETH_ALEN, src->mac_addr_mask,
2220 ETH_ALEN);
2221 params->mac_addr = mac_addr;
2222 params->mac_addr_mask = mac_addr + ETH_ALEN;
2223 }
2224 }
2225 return params;
2226
2227 failed:
2228 wpa_scan_free_params(params);
2229 return NULL;
2230 }
2231
2232
2233 void wpa_scan_free_params(struct wpa_driver_scan_params *params)
2234 {
2235 size_t i;
2236
2237 if (params == NULL)
2238 return;
2239
2240 for (i = 0; i < params->num_ssids; i++)
2241 os_free((u8 *) params->ssids[i].ssid);
2242 os_free((u8 *) params->extra_ies);
2243 os_free(params->freqs);
2244 os_free(params->filter_ssids);
2245
2246 /*
2247 * Note: params->mac_addr_mask points to same memory allocation and
2248 * must not be freed separately.
2249 */
2250 os_free((u8 *) params->mac_addr);
2251
2252 os_free(params);
2253 }
2254
2255
2256 int wpas_start_pno(struct wpa_supplicant *wpa_s)
2257 {
2258 int ret, interval, prio;
2259 size_t i, num_ssid, num_match_ssid;
2260 struct wpa_ssid *ssid;
2261 struct wpa_driver_scan_params params;
2262
2263 if (!wpa_s->sched_scan_supported)
2264 return -1;
2265
2266 if (wpa_s->pno || wpa_s->pno_sched_pending)
2267 return 0;
2268
2269 if ((wpa_s->wpa_state > WPA_SCANNING) &&
2270 (wpa_s->wpa_state <= WPA_COMPLETED)) {
2271 wpa_printf(MSG_ERROR, "PNO: In assoc process");
2272 return -EAGAIN;
2273 }
2274
2275 if (wpa_s->wpa_state == WPA_SCANNING) {
2276 wpa_supplicant_cancel_scan(wpa_s);
2277 if (wpa_s->sched_scanning) {
2278 wpa_printf(MSG_DEBUG, "Schedule PNO on completion of "
2279 "ongoing sched scan");
2280 wpa_supplicant_cancel_sched_scan(wpa_s);
2281 wpa_s->pno_sched_pending = 1;
2282 return 0;
2283 }
2284 }
2285
2286 os_memset(&params, 0, sizeof(params));
2287
2288 num_ssid = num_match_ssid = 0;
2289 ssid = wpa_s->conf->ssid;
2290 while (ssid) {
2291 if (!wpas_network_disabled(wpa_s, ssid)) {
2292 num_match_ssid++;
2293 if (ssid->scan_ssid)
2294 num_ssid++;
2295 }
2296 ssid = ssid->next;
2297 }
2298
2299 if (num_match_ssid == 0) {
2300 wpa_printf(MSG_DEBUG, "PNO: No configured SSIDs");
2301 return -1;
2302 }
2303
2304 if (num_match_ssid > num_ssid) {
2305 params.num_ssids++; /* wildcard */
2306 num_ssid++;
2307 }
2308
2309 if (num_ssid > WPAS_MAX_SCAN_SSIDS) {
2310 wpa_printf(MSG_DEBUG, "PNO: Use only the first %u SSIDs from "
2311 "%u", WPAS_MAX_SCAN_SSIDS, (unsigned int) num_ssid);
2312 num_ssid = WPAS_MAX_SCAN_SSIDS;
2313 }
2314
2315 if (num_match_ssid > wpa_s->max_match_sets) {
2316 num_match_ssid = wpa_s->max_match_sets;
2317 wpa_dbg(wpa_s, MSG_DEBUG, "PNO: Too many SSIDs to match");
2318 }
2319 params.filter_ssids = os_calloc(num_match_ssid,
2320 sizeof(struct wpa_driver_scan_filter));
2321 if (params.filter_ssids == NULL)
2322 return -1;
2323
2324 i = 0;
2325 prio = 0;
2326 ssid = wpa_s->conf->pssid[prio];
2327 while (ssid) {
2328 if (!wpas_network_disabled(wpa_s, ssid)) {
2329 if (ssid->scan_ssid && params.num_ssids < num_ssid) {
2330 params.ssids[params.num_ssids].ssid =
2331 ssid->ssid;
2332 params.ssids[params.num_ssids].ssid_len =
2333 ssid->ssid_len;
2334 params.num_ssids++;
2335 }
2336 os_memcpy(params.filter_ssids[i].ssid, ssid->ssid,
2337 ssid->ssid_len);
2338 params.filter_ssids[i].ssid_len = ssid->ssid_len;
2339 params.num_filter_ssids++;
2340 i++;
2341 if (i == num_match_ssid)
2342 break;
2343 }
2344 if (ssid->pnext)
2345 ssid = ssid->pnext;
2346 else if (prio + 1 == wpa_s->conf->num_prio)
2347 break;
2348 else
2349 ssid = wpa_s->conf->pssid[++prio];
2350 }
2351
2352 if (wpa_s->conf->filter_rssi)
2353 params.filter_rssi = wpa_s->conf->filter_rssi;
2354
2355 interval = wpa_s->conf->sched_scan_interval ?
2356 wpa_s->conf->sched_scan_interval : 10;
2357
2358 if (params.freqs == NULL && wpa_s->manual_sched_scan_freqs) {
2359 wpa_dbg(wpa_s, MSG_DEBUG, "Limit sched scan to specified channels");
2360 params.freqs = wpa_s->manual_sched_scan_freqs;
2361 }
2362
2363 if (wpa_s->mac_addr_rand_enable & MAC_ADDR_RAND_PNO) {
2364 params.mac_addr_rand = 1;
2365 if (wpa_s->mac_addr_pno) {
2366 params.mac_addr = wpa_s->mac_addr_pno;
2367 params.mac_addr_mask = wpa_s->mac_addr_pno + ETH_ALEN;
2368 }
2369 }
2370
2371 ret = wpa_supplicant_start_sched_scan(wpa_s, &params, interval);
2372 os_free(params.filter_ssids);
2373 if (ret == 0)
2374 wpa_s->pno = 1;
2375 else
2376 wpa_msg(wpa_s, MSG_ERROR, "Failed to schedule PNO");
2377 return ret;
2378 }
2379
2380
2381 int wpas_stop_pno(struct wpa_supplicant *wpa_s)
2382 {
2383 int ret = 0;
2384
2385 if (!wpa_s->pno)
2386 return 0;
2387
2388 ret = wpa_supplicant_stop_sched_scan(wpa_s);
2389
2390 wpa_s->pno = 0;
2391 wpa_s->pno_sched_pending = 0;
2392
2393 if (wpa_s->wpa_state == WPA_SCANNING)
2394 wpa_supplicant_req_scan(wpa_s, 0, 0);
2395
2396 return ret;
2397 }
2398
2399
2400 void wpas_mac_addr_rand_scan_clear(struct wpa_supplicant *wpa_s,
2401 unsigned int type)
2402 {
2403 type &= MAC_ADDR_RAND_ALL;
2404 wpa_s->mac_addr_rand_enable &= ~type;
2405
2406 if (type & MAC_ADDR_RAND_SCAN) {
2407 os_free(wpa_s->mac_addr_scan);
2408 wpa_s->mac_addr_scan = NULL;
2409 }
2410
2411 if (type & MAC_ADDR_RAND_SCHED_SCAN) {
2412 os_free(wpa_s->mac_addr_sched_scan);
2413 wpa_s->mac_addr_sched_scan = NULL;
2414 }
2415
2416 if (type & MAC_ADDR_RAND_PNO) {
2417 os_free(wpa_s->mac_addr_pno);
2418 wpa_s->mac_addr_pno = NULL;
2419 }
2420 }
2421
2422
2423 int wpas_mac_addr_rand_scan_set(struct wpa_supplicant *wpa_s,
2424 unsigned int type, const u8 *addr,
2425 const u8 *mask)
2426 {
2427 u8 *tmp = NULL;
2428
2429 wpas_mac_addr_rand_scan_clear(wpa_s, type);
2430
2431 if (addr) {
2432 tmp = os_malloc(2 * ETH_ALEN);
2433 if (!tmp)
2434 return -1;
2435 os_memcpy(tmp, addr, ETH_ALEN);
2436 os_memcpy(tmp + ETH_ALEN, mask, ETH_ALEN);
2437 }
2438
2439 if (type == MAC_ADDR_RAND_SCAN) {
2440 wpa_s->mac_addr_scan = tmp;
2441 } else if (type == MAC_ADDR_RAND_SCHED_SCAN) {
2442 wpa_s->mac_addr_sched_scan = tmp;
2443 } else if (type == MAC_ADDR_RAND_PNO) {
2444 wpa_s->mac_addr_pno = tmp;
2445 } else {
2446 wpa_printf(MSG_INFO,
2447 "scan: Invalid MAC randomization type=0x%x",
2448 type);
2449 os_free(tmp);
2450 return -1;
2451 }
2452
2453 wpa_s->mac_addr_rand_enable |= type;
2454 return 0;
2455 }
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