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Fix SELECT_NETWORK freq parameter
[thirdparty/hostap.git] / wpa_supplicant / scan.c
1 /*
2 * WPA Supplicant - Scanning
3 * Copyright (c) 2003-2014, Jouni Malinen <j@w1.fi>
4 *
5 * This software may be distributed under the terms of the BSD license.
6 * See README for more details.
7 */
8
9 #include "utils/includes.h"
10
11 #include "utils/common.h"
12 #include "utils/eloop.h"
13 #include "common/ieee802_11_defs.h"
14 #include "common/wpa_ctrl.h"
15 #include "config.h"
16 #include "wpa_supplicant_i.h"
17 #include "driver_i.h"
18 #include "wps_supplicant.h"
19 #include "p2p_supplicant.h"
20 #include "p2p/p2p.h"
21 #include "hs20_supplicant.h"
22 #include "notify.h"
23 #include "bss.h"
24 #include "scan.h"
25 #include "mesh.h"
26
27
28 static void wpa_supplicant_gen_assoc_event(struct wpa_supplicant *wpa_s)
29 {
30 struct wpa_ssid *ssid;
31 union wpa_event_data data;
32
33 ssid = wpa_supplicant_get_ssid(wpa_s);
34 if (ssid == NULL)
35 return;
36
37 if (wpa_s->current_ssid == NULL) {
38 wpa_s->current_ssid = ssid;
39 wpas_notify_network_changed(wpa_s);
40 }
41 wpa_supplicant_initiate_eapol(wpa_s);
42 wpa_dbg(wpa_s, MSG_DEBUG, "Already associated with a configured "
43 "network - generating associated event");
44 os_memset(&data, 0, sizeof(data));
45 wpa_supplicant_event(wpa_s, EVENT_ASSOC, &data);
46 }
47
48
49 #ifdef CONFIG_WPS
50 static int wpas_wps_in_use(struct wpa_supplicant *wpa_s,
51 enum wps_request_type *req_type)
52 {
53 struct wpa_ssid *ssid;
54 int wps = 0;
55
56 for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
57 if (!(ssid->key_mgmt & WPA_KEY_MGMT_WPS))
58 continue;
59
60 wps = 1;
61 *req_type = wpas_wps_get_req_type(ssid);
62 if (ssid->eap.phase1 && os_strstr(ssid->eap.phase1, "pbc=1"))
63 return 2;
64 }
65
66 #ifdef CONFIG_P2P
67 if (!wpa_s->global->p2p_disabled && wpa_s->global->p2p &&
68 !wpa_s->conf->p2p_disabled) {
69 wpa_s->wps->dev.p2p = 1;
70 if (!wps) {
71 wps = 1;
72 *req_type = WPS_REQ_ENROLLEE_INFO;
73 }
74 }
75 #endif /* CONFIG_P2P */
76
77 return wps;
78 }
79 #endif /* CONFIG_WPS */
80
81
82 /**
83 * wpa_supplicant_enabled_networks - Check whether there are enabled networks
84 * @wpa_s: Pointer to wpa_supplicant data
85 * Returns: 0 if no networks are enabled, >0 if networks are enabled
86 *
87 * This function is used to figure out whether any networks (or Interworking
88 * with enabled credentials and auto_interworking) are present in the current
89 * configuration.
90 */
91 int wpa_supplicant_enabled_networks(struct wpa_supplicant *wpa_s)
92 {
93 struct wpa_ssid *ssid = wpa_s->conf->ssid;
94 int count = 0, disabled = 0;
95
96 if (wpa_s->p2p_mgmt)
97 return 0; /* no normal network profiles on p2p_mgmt interface */
98
99 while (ssid) {
100 if (!wpas_network_disabled(wpa_s, ssid))
101 count++;
102 else
103 disabled++;
104 ssid = ssid->next;
105 }
106 if (wpa_s->conf->cred && wpa_s->conf->interworking &&
107 wpa_s->conf->auto_interworking)
108 count++;
109 if (count == 0 && disabled > 0) {
110 wpa_dbg(wpa_s, MSG_DEBUG, "No enabled networks (%d disabled "
111 "networks)", disabled);
112 }
113 return count;
114 }
115
116
117 static void wpa_supplicant_assoc_try(struct wpa_supplicant *wpa_s,
118 struct wpa_ssid *ssid)
119 {
120 while (ssid) {
121 if (!wpas_network_disabled(wpa_s, ssid))
122 break;
123 ssid = ssid->next;
124 }
125
126 /* ap_scan=2 mode - try to associate with each SSID. */
127 if (ssid == NULL) {
128 wpa_dbg(wpa_s, MSG_DEBUG, "wpa_supplicant_assoc_try: Reached "
129 "end of scan list - go back to beginning");
130 wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
131 wpa_supplicant_req_scan(wpa_s, 0, 0);
132 return;
133 }
134 if (ssid->next) {
135 /* Continue from the next SSID on the next attempt. */
136 wpa_s->prev_scan_ssid = ssid;
137 } else {
138 /* Start from the beginning of the SSID list. */
139 wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
140 }
141 wpa_supplicant_associate(wpa_s, NULL, ssid);
142 }
143
144
145 static void wpas_trigger_scan_cb(struct wpa_radio_work *work, int deinit)
146 {
147 struct wpa_supplicant *wpa_s = work->wpa_s;
148 struct wpa_driver_scan_params *params = work->ctx;
149 int ret;
150
151 if (deinit) {
152 if (!work->started) {
153 wpa_scan_free_params(params);
154 return;
155 }
156 wpa_supplicant_notify_scanning(wpa_s, 0);
157 wpas_notify_scan_done(wpa_s, 0);
158 wpa_s->scan_work = NULL;
159 return;
160 }
161
162 if (wpas_update_random_addr_disassoc(wpa_s) < 0) {
163 wpa_msg(wpa_s, MSG_INFO,
164 "Failed to assign random MAC address for a scan");
165 wpa_scan_free_params(params);
166 wpa_msg(wpa_s, MSG_INFO, WPA_EVENT_SCAN_FAILED "ret=-1");
167 radio_work_done(work);
168 return;
169 }
170
171 wpa_supplicant_notify_scanning(wpa_s, 1);
172
173 if (wpa_s->clear_driver_scan_cache) {
174 wpa_printf(MSG_DEBUG,
175 "Request driver to clear scan cache due to local BSS flush");
176 params->only_new_results = 1;
177 }
178 ret = wpa_drv_scan(wpa_s, params);
179 /*
180 * Store the obtained vendor scan cookie (if any) in wpa_s context.
181 * The current design is to allow only one scan request on each
182 * interface, hence having this scan cookie stored in wpa_s context is
183 * fine for now.
184 *
185 * Revisit this logic if concurrent scan operations per interface
186 * is supported.
187 */
188 if (ret == 0)
189 wpa_s->curr_scan_cookie = params->scan_cookie;
190 wpa_scan_free_params(params);
191 work->ctx = NULL;
192 if (ret) {
193 int retry = wpa_s->last_scan_req != MANUAL_SCAN_REQ;
194
195 if (wpa_s->disconnected)
196 retry = 0;
197
198 wpa_supplicant_notify_scanning(wpa_s, 0);
199 wpas_notify_scan_done(wpa_s, 0);
200 if (wpa_s->wpa_state == WPA_SCANNING)
201 wpa_supplicant_set_state(wpa_s,
202 wpa_s->scan_prev_wpa_state);
203 wpa_msg(wpa_s, MSG_INFO, WPA_EVENT_SCAN_FAILED "ret=%d%s",
204 ret, retry ? " retry=1" : "");
205 radio_work_done(work);
206
207 if (retry) {
208 /* Restore scan_req since we will try to scan again */
209 wpa_s->scan_req = wpa_s->last_scan_req;
210 wpa_supplicant_req_scan(wpa_s, 1, 0);
211 }
212 return;
213 }
214
215 os_get_reltime(&wpa_s->scan_trigger_time);
216 wpa_s->scan_runs++;
217 wpa_s->normal_scans++;
218 wpa_s->own_scan_requested = 1;
219 wpa_s->clear_driver_scan_cache = 0;
220 wpa_s->scan_work = work;
221 }
222
223
224 /**
225 * wpa_supplicant_trigger_scan - Request driver to start a scan
226 * @wpa_s: Pointer to wpa_supplicant data
227 * @params: Scan parameters
228 * Returns: 0 on success, -1 on failure
229 */
230 int wpa_supplicant_trigger_scan(struct wpa_supplicant *wpa_s,
231 struct wpa_driver_scan_params *params)
232 {
233 struct wpa_driver_scan_params *ctx;
234
235 if (wpa_s->scan_work) {
236 wpa_dbg(wpa_s, MSG_INFO, "Reject scan trigger since one is already pending");
237 return -1;
238 }
239
240 ctx = wpa_scan_clone_params(params);
241 if (!ctx ||
242 radio_add_work(wpa_s, 0, "scan", 0, wpas_trigger_scan_cb, ctx) < 0)
243 {
244 wpa_scan_free_params(ctx);
245 wpa_msg(wpa_s, MSG_INFO, WPA_EVENT_SCAN_FAILED "ret=-1");
246 return -1;
247 }
248
249 return 0;
250 }
251
252
253 static void
254 wpa_supplicant_delayed_sched_scan_timeout(void *eloop_ctx, void *timeout_ctx)
255 {
256 struct wpa_supplicant *wpa_s = eloop_ctx;
257
258 wpa_dbg(wpa_s, MSG_DEBUG, "Starting delayed sched scan");
259
260 if (wpa_supplicant_req_sched_scan(wpa_s))
261 wpa_supplicant_req_scan(wpa_s, 0, 0);
262 }
263
264
265 static void
266 wpa_supplicant_sched_scan_timeout(void *eloop_ctx, void *timeout_ctx)
267 {
268 struct wpa_supplicant *wpa_s = eloop_ctx;
269
270 wpa_dbg(wpa_s, MSG_DEBUG, "Sched scan timeout - stopping it");
271
272 wpa_s->sched_scan_timed_out = 1;
273 wpa_supplicant_cancel_sched_scan(wpa_s);
274 }
275
276
277 static int
278 wpa_supplicant_start_sched_scan(struct wpa_supplicant *wpa_s,
279 struct wpa_driver_scan_params *params)
280 {
281 int ret;
282
283 wpa_supplicant_notify_scanning(wpa_s, 1);
284 ret = wpa_drv_sched_scan(wpa_s, params);
285 if (ret)
286 wpa_supplicant_notify_scanning(wpa_s, 0);
287 else
288 wpa_s->sched_scanning = 1;
289
290 return ret;
291 }
292
293
294 static int wpa_supplicant_stop_sched_scan(struct wpa_supplicant *wpa_s)
295 {
296 int ret;
297
298 ret = wpa_drv_stop_sched_scan(wpa_s);
299 if (ret) {
300 wpa_dbg(wpa_s, MSG_DEBUG, "stopping sched_scan failed!");
301 /* TODO: what to do if stopping fails? */
302 return -1;
303 }
304
305 return ret;
306 }
307
308
309 static struct wpa_driver_scan_filter *
310 wpa_supplicant_build_filter_ssids(struct wpa_config *conf, size_t *num_ssids)
311 {
312 struct wpa_driver_scan_filter *ssids;
313 struct wpa_ssid *ssid;
314 size_t count;
315
316 *num_ssids = 0;
317 if (!conf->filter_ssids)
318 return NULL;
319
320 for (count = 0, ssid = conf->ssid; ssid; ssid = ssid->next) {
321 if (ssid->ssid && ssid->ssid_len)
322 count++;
323 }
324 if (count == 0)
325 return NULL;
326 ssids = os_calloc(count, sizeof(struct wpa_driver_scan_filter));
327 if (ssids == NULL)
328 return NULL;
329
330 for (ssid = conf->ssid; ssid; ssid = ssid->next) {
331 if (!ssid->ssid || !ssid->ssid_len)
332 continue;
333 os_memcpy(ssids[*num_ssids].ssid, ssid->ssid, ssid->ssid_len);
334 ssids[*num_ssids].ssid_len = ssid->ssid_len;
335 (*num_ssids)++;
336 }
337
338 return ssids;
339 }
340
341
342 static void wpa_supplicant_optimize_freqs(
343 struct wpa_supplicant *wpa_s, struct wpa_driver_scan_params *params)
344 {
345 #ifdef CONFIG_P2P
346 if (params->freqs == NULL && wpa_s->p2p_in_provisioning &&
347 wpa_s->go_params) {
348 /* Optimize provisioning state scan based on GO information */
349 if (wpa_s->p2p_in_provisioning < 5 &&
350 wpa_s->go_params->freq > 0) {
351 wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only GO "
352 "preferred frequency %d MHz",
353 wpa_s->go_params->freq);
354 params->freqs = os_calloc(2, sizeof(int));
355 if (params->freqs)
356 params->freqs[0] = wpa_s->go_params->freq;
357 } else if (wpa_s->p2p_in_provisioning < 8 &&
358 wpa_s->go_params->freq_list[0]) {
359 wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only common "
360 "channels");
361 int_array_concat(&params->freqs,
362 wpa_s->go_params->freq_list);
363 if (params->freqs)
364 int_array_sort_unique(params->freqs);
365 }
366 wpa_s->p2p_in_provisioning++;
367 }
368
369 if (params->freqs == NULL && wpa_s->p2p_in_invitation) {
370 /*
371 * Optimize scan based on GO information during persistent
372 * group reinvocation
373 */
374 if (wpa_s->p2p_in_invitation < 5 &&
375 wpa_s->p2p_invite_go_freq > 0) {
376 wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only GO preferred frequency %d MHz during invitation",
377 wpa_s->p2p_invite_go_freq);
378 params->freqs = os_calloc(2, sizeof(int));
379 if (params->freqs)
380 params->freqs[0] = wpa_s->p2p_invite_go_freq;
381 }
382 wpa_s->p2p_in_invitation++;
383 if (wpa_s->p2p_in_invitation > 20) {
384 /*
385 * This should not really happen since the variable is
386 * cleared on group removal, but if it does happen, make
387 * sure we do not get stuck in special invitation scan
388 * mode.
389 */
390 wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Clear p2p_in_invitation");
391 wpa_s->p2p_in_invitation = 0;
392 }
393 }
394 #endif /* CONFIG_P2P */
395
396 #ifdef CONFIG_WPS
397 if (params->freqs == NULL && wpa_s->after_wps && wpa_s->wps_freq) {
398 /*
399 * Optimize post-provisioning scan based on channel used
400 * during provisioning.
401 */
402 wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Scan only frequency %u MHz "
403 "that was used during provisioning", wpa_s->wps_freq);
404 params->freqs = os_calloc(2, sizeof(int));
405 if (params->freqs)
406 params->freqs[0] = wpa_s->wps_freq;
407 wpa_s->after_wps--;
408 } else if (wpa_s->after_wps)
409 wpa_s->after_wps--;
410
411 if (params->freqs == NULL && wpa_s->known_wps_freq && wpa_s->wps_freq)
412 {
413 /* Optimize provisioning scan based on already known channel */
414 wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Scan only frequency %u MHz",
415 wpa_s->wps_freq);
416 params->freqs = os_calloc(2, sizeof(int));
417 if (params->freqs)
418 params->freqs[0] = wpa_s->wps_freq;
419 wpa_s->known_wps_freq = 0; /* only do this once */
420 }
421 #endif /* CONFIG_WPS */
422 }
423
424
425 #ifdef CONFIG_INTERWORKING
426 static void wpas_add_interworking_elements(struct wpa_supplicant *wpa_s,
427 struct wpabuf *buf)
428 {
429 wpabuf_put_u8(buf, WLAN_EID_INTERWORKING);
430 wpabuf_put_u8(buf, is_zero_ether_addr(wpa_s->conf->hessid) ? 1 :
431 1 + ETH_ALEN);
432 wpabuf_put_u8(buf, wpa_s->conf->access_network_type);
433 /* No Venue Info */
434 if (!is_zero_ether_addr(wpa_s->conf->hessid))
435 wpabuf_put_data(buf, wpa_s->conf->hessid, ETH_ALEN);
436 }
437 #endif /* CONFIG_INTERWORKING */
438
439
440 void wpa_supplicant_set_default_scan_ies(struct wpa_supplicant *wpa_s)
441 {
442 struct wpabuf *default_ies = NULL;
443 u8 ext_capab[18];
444 int ext_capab_len;
445 enum wpa_driver_if_type type = WPA_IF_STATION;
446
447 #ifdef CONFIG_P2P
448 if (wpa_s->p2p_group_interface == P2P_GROUP_INTERFACE_CLIENT)
449 type = WPA_IF_P2P_CLIENT;
450 #endif /* CONFIG_P2P */
451
452 wpa_drv_get_ext_capa(wpa_s, type);
453
454 ext_capab_len = wpas_build_ext_capab(wpa_s, ext_capab,
455 sizeof(ext_capab));
456 if (ext_capab_len > 0 &&
457 wpabuf_resize(&default_ies, ext_capab_len) == 0)
458 wpabuf_put_data(default_ies, ext_capab, ext_capab_len);
459
460 #ifdef CONFIG_MBO
461 /* Send cellular capabilities for potential MBO STAs */
462 if (wpabuf_resize(&default_ies, 9) == 0)
463 wpas_mbo_scan_ie(wpa_s, default_ies);
464 #endif /* CONFIG_MBO */
465
466 if (default_ies)
467 wpa_drv_set_default_scan_ies(wpa_s, wpabuf_head(default_ies),
468 wpabuf_len(default_ies));
469 wpabuf_free(default_ies);
470 }
471
472
473 static struct wpabuf * wpa_supplicant_extra_ies(struct wpa_supplicant *wpa_s)
474 {
475 struct wpabuf *extra_ie = NULL;
476 u8 ext_capab[18];
477 int ext_capab_len;
478 #ifdef CONFIG_WPS
479 int wps = 0;
480 enum wps_request_type req_type = WPS_REQ_ENROLLEE_INFO;
481 #endif /* CONFIG_WPS */
482
483 #ifdef CONFIG_P2P
484 if (wpa_s->p2p_group_interface == P2P_GROUP_INTERFACE_CLIENT)
485 wpa_drv_get_ext_capa(wpa_s, WPA_IF_P2P_CLIENT);
486 else
487 #endif /* CONFIG_P2P */
488 wpa_drv_get_ext_capa(wpa_s, WPA_IF_STATION);
489
490 ext_capab_len = wpas_build_ext_capab(wpa_s, ext_capab,
491 sizeof(ext_capab));
492 if (ext_capab_len > 0 &&
493 wpabuf_resize(&extra_ie, ext_capab_len) == 0)
494 wpabuf_put_data(extra_ie, ext_capab, ext_capab_len);
495
496 #ifdef CONFIG_INTERWORKING
497 if (wpa_s->conf->interworking &&
498 wpabuf_resize(&extra_ie, 100) == 0)
499 wpas_add_interworking_elements(wpa_s, extra_ie);
500 #endif /* CONFIG_INTERWORKING */
501
502 #ifdef CONFIG_WPS
503 wps = wpas_wps_in_use(wpa_s, &req_type);
504
505 if (wps) {
506 struct wpabuf *wps_ie;
507 wps_ie = wps_build_probe_req_ie(wps == 2 ? DEV_PW_PUSHBUTTON :
508 DEV_PW_DEFAULT,
509 &wpa_s->wps->dev,
510 wpa_s->wps->uuid, req_type,
511 0, NULL);
512 if (wps_ie) {
513 if (wpabuf_resize(&extra_ie, wpabuf_len(wps_ie)) == 0)
514 wpabuf_put_buf(extra_ie, wps_ie);
515 wpabuf_free(wps_ie);
516 }
517 }
518
519 #ifdef CONFIG_P2P
520 if (wps) {
521 size_t ielen = p2p_scan_ie_buf_len(wpa_s->global->p2p);
522 if (wpabuf_resize(&extra_ie, ielen) == 0)
523 wpas_p2p_scan_ie(wpa_s, extra_ie);
524 }
525 #endif /* CONFIG_P2P */
526
527 wpa_supplicant_mesh_add_scan_ie(wpa_s, &extra_ie);
528
529 #endif /* CONFIG_WPS */
530
531 #ifdef CONFIG_HS20
532 if (wpa_s->conf->hs20 && wpabuf_resize(&extra_ie, 7) == 0)
533 wpas_hs20_add_indication(extra_ie, -1);
534 #endif /* CONFIG_HS20 */
535
536 #ifdef CONFIG_FST
537 if (wpa_s->fst_ies &&
538 wpabuf_resize(&extra_ie, wpabuf_len(wpa_s->fst_ies)) == 0)
539 wpabuf_put_buf(extra_ie, wpa_s->fst_ies);
540 #endif /* CONFIG_FST */
541
542 #ifdef CONFIG_MBO
543 /* Send cellular capabilities for potential MBO STAs */
544 if (wpabuf_resize(&extra_ie, 9) == 0)
545 wpas_mbo_scan_ie(wpa_s, extra_ie);
546 #endif /* CONFIG_MBO */
547
548 if (wpa_s->vendor_elem[VENDOR_ELEM_PROBE_REQ]) {
549 struct wpabuf *buf = wpa_s->vendor_elem[VENDOR_ELEM_PROBE_REQ];
550
551 if (wpabuf_resize(&extra_ie, wpabuf_len(buf)) == 0)
552 wpabuf_put_buf(extra_ie, buf);
553 }
554
555 return extra_ie;
556 }
557
558
559 #ifdef CONFIG_P2P
560
561 /*
562 * Check whether there are any enabled networks or credentials that could be
563 * used for a non-P2P connection.
564 */
565 static int non_p2p_network_enabled(struct wpa_supplicant *wpa_s)
566 {
567 struct wpa_ssid *ssid;
568
569 for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
570 if (wpas_network_disabled(wpa_s, ssid))
571 continue;
572 if (!ssid->p2p_group)
573 return 1;
574 }
575
576 if (wpa_s->conf->cred && wpa_s->conf->interworking &&
577 wpa_s->conf->auto_interworking)
578 return 1;
579
580 return 0;
581 }
582
583 #endif /* CONFIG_P2P */
584
585
586 static void wpa_setband_scan_freqs_list(struct wpa_supplicant *wpa_s,
587 enum hostapd_hw_mode band,
588 struct wpa_driver_scan_params *params)
589 {
590 /* Include only supported channels for the specified band */
591 struct hostapd_hw_modes *mode;
592 int count, i;
593
594 mode = get_mode(wpa_s->hw.modes, wpa_s->hw.num_modes, band);
595 if (mode == NULL) {
596 /* No channels supported in this band - use empty list */
597 params->freqs = os_zalloc(sizeof(int));
598 return;
599 }
600
601 params->freqs = os_calloc(mode->num_channels + 1, sizeof(int));
602 if (params->freqs == NULL)
603 return;
604 for (count = 0, i = 0; i < mode->num_channels; i++) {
605 if (mode->channels[i].flag & HOSTAPD_CHAN_DISABLED)
606 continue;
607 params->freqs[count++] = mode->channels[i].freq;
608 }
609 }
610
611
612 static void wpa_setband_scan_freqs(struct wpa_supplicant *wpa_s,
613 struct wpa_driver_scan_params *params)
614 {
615 if (wpa_s->hw.modes == NULL)
616 return; /* unknown what channels the driver supports */
617 if (params->freqs)
618 return; /* already using a limited channel set */
619 if (wpa_s->setband == WPA_SETBAND_5G)
620 wpa_setband_scan_freqs_list(wpa_s, HOSTAPD_MODE_IEEE80211A,
621 params);
622 else if (wpa_s->setband == WPA_SETBAND_2G)
623 wpa_setband_scan_freqs_list(wpa_s, HOSTAPD_MODE_IEEE80211G,
624 params);
625 }
626
627
628 static void wpa_set_scan_ssids(struct wpa_supplicant *wpa_s,
629 struct wpa_driver_scan_params *params,
630 size_t max_ssids)
631 {
632 unsigned int i;
633 struct wpa_ssid *ssid;
634
635 /*
636 * For devices with max_ssids greater than 1, leave the last slot empty
637 * for adding the wildcard scan entry.
638 */
639 max_ssids = max_ssids > 1 ? max_ssids - 1 : max_ssids;
640
641 for (i = 0; i < wpa_s->scan_id_count; i++) {
642 unsigned int j;
643
644 ssid = wpa_config_get_network(wpa_s->conf, wpa_s->scan_id[i]);
645 if (!ssid || !ssid->scan_ssid)
646 continue;
647
648 for (j = 0; j < params->num_ssids; j++) {
649 if (params->ssids[j].ssid_len == ssid->ssid_len &&
650 params->ssids[j].ssid &&
651 os_memcmp(params->ssids[j].ssid, ssid->ssid,
652 ssid->ssid_len) == 0)
653 break;
654 }
655 if (j < params->num_ssids)
656 continue; /* already in the list */
657
658 if (params->num_ssids + 1 > max_ssids) {
659 wpa_printf(MSG_DEBUG,
660 "Over max scan SSIDs for manual request");
661 break;
662 }
663
664 wpa_printf(MSG_DEBUG, "Scan SSID (manual request): %s",
665 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
666 params->ssids[params->num_ssids].ssid = ssid->ssid;
667 params->ssids[params->num_ssids].ssid_len = ssid->ssid_len;
668 params->num_ssids++;
669 }
670
671 wpa_s->scan_id_count = 0;
672 }
673
674
675 static int wpa_set_ssids_from_scan_req(struct wpa_supplicant *wpa_s,
676 struct wpa_driver_scan_params *params,
677 size_t max_ssids)
678 {
679 unsigned int i;
680
681 if (wpa_s->ssids_from_scan_req == NULL ||
682 wpa_s->num_ssids_from_scan_req == 0)
683 return 0;
684
685 if (wpa_s->num_ssids_from_scan_req > max_ssids) {
686 wpa_s->num_ssids_from_scan_req = max_ssids;
687 wpa_printf(MSG_DEBUG, "Over max scan SSIDs from scan req: %u",
688 (unsigned int) max_ssids);
689 }
690
691 for (i = 0; i < wpa_s->num_ssids_from_scan_req; i++) {
692 params->ssids[i].ssid = wpa_s->ssids_from_scan_req[i].ssid;
693 params->ssids[i].ssid_len =
694 wpa_s->ssids_from_scan_req[i].ssid_len;
695 wpa_hexdump_ascii(MSG_DEBUG, "specific SSID",
696 params->ssids[i].ssid,
697 params->ssids[i].ssid_len);
698 }
699
700 params->num_ssids = wpa_s->num_ssids_from_scan_req;
701 wpa_s->num_ssids_from_scan_req = 0;
702 return 1;
703 }
704
705
706 static void wpa_supplicant_scan(void *eloop_ctx, void *timeout_ctx)
707 {
708 struct wpa_supplicant *wpa_s = eloop_ctx;
709 struct wpa_ssid *ssid;
710 int ret, p2p_in_prog;
711 struct wpabuf *extra_ie = NULL;
712 struct wpa_driver_scan_params params;
713 struct wpa_driver_scan_params *scan_params;
714 size_t max_ssids;
715 int connect_without_scan = 0;
716
717 wpa_s->ignore_post_flush_scan_res = 0;
718
719 if (wpa_s->wpa_state == WPA_INTERFACE_DISABLED) {
720 wpa_dbg(wpa_s, MSG_DEBUG, "Skip scan - interface disabled");
721 return;
722 }
723
724 if (wpa_s->disconnected && wpa_s->scan_req == NORMAL_SCAN_REQ) {
725 wpa_dbg(wpa_s, MSG_DEBUG, "Disconnected - do not scan");
726 wpa_supplicant_set_state(wpa_s, WPA_DISCONNECTED);
727 return;
728 }
729
730 if (wpa_s->scanning) {
731 /*
732 * If we are already in scanning state, we shall reschedule the
733 * the incoming scan request.
734 */
735 wpa_dbg(wpa_s, MSG_DEBUG, "Already scanning - Reschedule the incoming scan req");
736 wpa_supplicant_req_scan(wpa_s, 1, 0);
737 return;
738 }
739
740 if (!wpa_supplicant_enabled_networks(wpa_s) &&
741 wpa_s->scan_req == NORMAL_SCAN_REQ) {
742 wpa_dbg(wpa_s, MSG_DEBUG, "No enabled networks - do not scan");
743 wpa_supplicant_set_state(wpa_s, WPA_INACTIVE);
744 return;
745 }
746
747 if (wpa_s->conf->ap_scan != 0 &&
748 (wpa_s->drv_flags & WPA_DRIVER_FLAGS_WIRED)) {
749 wpa_dbg(wpa_s, MSG_DEBUG, "Using wired authentication - "
750 "overriding ap_scan configuration");
751 wpa_s->conf->ap_scan = 0;
752 wpas_notify_ap_scan_changed(wpa_s);
753 }
754
755 if (wpa_s->conf->ap_scan == 0) {
756 wpa_supplicant_gen_assoc_event(wpa_s);
757 return;
758 }
759
760 ssid = NULL;
761 if (wpa_s->scan_req != MANUAL_SCAN_REQ &&
762 wpa_s->connect_without_scan) {
763 connect_without_scan = 1;
764 for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
765 if (ssid == wpa_s->connect_without_scan)
766 break;
767 }
768 }
769
770 p2p_in_prog = wpas_p2p_in_progress(wpa_s);
771 if (p2p_in_prog && p2p_in_prog != 2 &&
772 (!ssid ||
773 (ssid->mode != WPAS_MODE_AP && ssid->mode != WPAS_MODE_P2P_GO))) {
774 wpa_dbg(wpa_s, MSG_DEBUG, "Delay station mode scan while P2P operation is in progress");
775 wpa_supplicant_req_scan(wpa_s, 5, 0);
776 return;
777 }
778
779 /*
780 * Don't cancel the scan based on ongoing PNO; defer it. Some scans are
781 * used for changing modes inside wpa_supplicant (roaming,
782 * auto-reconnect, etc). Discarding the scan might hurt these processes.
783 * The normal use case for PNO is to suspend the host immediately after
784 * starting PNO, so the periodic 100 ms attempts to run the scan do not
785 * normally happen in practice multiple times, i.e., this is simply
786 * restarting scanning once the host is woken up and PNO stopped.
787 */
788 if (wpa_s->pno || wpa_s->pno_sched_pending) {
789 wpa_dbg(wpa_s, MSG_DEBUG, "Defer scan - PNO is in progress");
790 wpa_supplicant_req_scan(wpa_s, 0, 100000);
791 return;
792 }
793
794 if (wpa_s->conf->ap_scan == 2)
795 max_ssids = 1;
796 else {
797 max_ssids = wpa_s->max_scan_ssids;
798 if (max_ssids > WPAS_MAX_SCAN_SSIDS)
799 max_ssids = WPAS_MAX_SCAN_SSIDS;
800 }
801
802 wpa_s->last_scan_req = wpa_s->scan_req;
803 wpa_s->scan_req = NORMAL_SCAN_REQ;
804
805 if (connect_without_scan) {
806 wpa_s->connect_without_scan = NULL;
807 if (ssid) {
808 wpa_printf(MSG_DEBUG, "Start a pre-selected network "
809 "without scan step");
810 wpa_supplicant_associate(wpa_s, NULL, ssid);
811 return;
812 }
813 }
814
815 os_memset(&params, 0, sizeof(params));
816
817 wpa_s->scan_prev_wpa_state = wpa_s->wpa_state;
818 if (wpa_s->wpa_state == WPA_DISCONNECTED ||
819 wpa_s->wpa_state == WPA_INACTIVE)
820 wpa_supplicant_set_state(wpa_s, WPA_SCANNING);
821
822 /*
823 * If autoscan has set its own scanning parameters
824 */
825 if (wpa_s->autoscan_params != NULL) {
826 scan_params = wpa_s->autoscan_params;
827 goto scan;
828 }
829
830 if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
831 wpa_set_ssids_from_scan_req(wpa_s, &params, max_ssids)) {
832 wpa_printf(MSG_DEBUG, "Use specific SSIDs from SCAN command");
833 goto ssid_list_set;
834 }
835
836 #ifdef CONFIG_P2P
837 if ((wpa_s->p2p_in_provisioning || wpa_s->show_group_started) &&
838 wpa_s->go_params && !wpa_s->conf->passive_scan) {
839 wpa_printf(MSG_DEBUG, "P2P: Use specific SSID for scan during P2P group formation (p2p_in_provisioning=%d show_group_started=%d)",
840 wpa_s->p2p_in_provisioning,
841 wpa_s->show_group_started);
842 params.ssids[0].ssid = wpa_s->go_params->ssid;
843 params.ssids[0].ssid_len = wpa_s->go_params->ssid_len;
844 params.num_ssids = 1;
845 goto ssid_list_set;
846 }
847
848 if (wpa_s->p2p_in_invitation) {
849 if (wpa_s->current_ssid) {
850 wpa_printf(MSG_DEBUG, "P2P: Use specific SSID for scan during invitation");
851 params.ssids[0].ssid = wpa_s->current_ssid->ssid;
852 params.ssids[0].ssid_len =
853 wpa_s->current_ssid->ssid_len;
854 params.num_ssids = 1;
855 } else {
856 wpa_printf(MSG_DEBUG, "P2P: No specific SSID known for scan during invitation");
857 }
858 goto ssid_list_set;
859 }
860 #endif /* CONFIG_P2P */
861
862 /* Find the starting point from which to continue scanning */
863 ssid = wpa_s->conf->ssid;
864 if (wpa_s->prev_scan_ssid != WILDCARD_SSID_SCAN) {
865 while (ssid) {
866 if (ssid == wpa_s->prev_scan_ssid) {
867 ssid = ssid->next;
868 break;
869 }
870 ssid = ssid->next;
871 }
872 }
873
874 if (wpa_s->last_scan_req != MANUAL_SCAN_REQ &&
875 #ifdef CONFIG_AP
876 !wpa_s->ap_iface &&
877 #endif /* CONFIG_AP */
878 wpa_s->conf->ap_scan == 2) {
879 wpa_s->connect_without_scan = NULL;
880 wpa_s->prev_scan_wildcard = 0;
881 wpa_supplicant_assoc_try(wpa_s, ssid);
882 return;
883 } else if (wpa_s->conf->ap_scan == 2) {
884 /*
885 * User-initiated scan request in ap_scan == 2; scan with
886 * wildcard SSID.
887 */
888 ssid = NULL;
889 } else if (wpa_s->reattach && wpa_s->current_ssid != NULL) {
890 /*
891 * Perform single-channel single-SSID scan for
892 * reassociate-to-same-BSS operation.
893 */
894 /* Setup SSID */
895 ssid = wpa_s->current_ssid;
896 wpa_hexdump_ascii(MSG_DEBUG, "Scan SSID",
897 ssid->ssid, ssid->ssid_len);
898 params.ssids[0].ssid = ssid->ssid;
899 params.ssids[0].ssid_len = ssid->ssid_len;
900 params.num_ssids = 1;
901
902 /*
903 * Allocate memory for frequency array, allocate one extra
904 * slot for the zero-terminator.
905 */
906 params.freqs = os_malloc(sizeof(int) * 2);
907 if (params.freqs) {
908 params.freqs[0] = wpa_s->assoc_freq;
909 params.freqs[1] = 0;
910 }
911
912 /*
913 * Reset the reattach flag so that we fall back to full scan if
914 * this scan fails.
915 */
916 wpa_s->reattach = 0;
917 } else {
918 struct wpa_ssid *start = ssid, *tssid;
919 int freqs_set = 0;
920 if (ssid == NULL && max_ssids > 1)
921 ssid = wpa_s->conf->ssid;
922 while (ssid) {
923 if (!wpas_network_disabled(wpa_s, ssid) &&
924 ssid->scan_ssid) {
925 wpa_hexdump_ascii(MSG_DEBUG, "Scan SSID",
926 ssid->ssid, ssid->ssid_len);
927 params.ssids[params.num_ssids].ssid =
928 ssid->ssid;
929 params.ssids[params.num_ssids].ssid_len =
930 ssid->ssid_len;
931 params.num_ssids++;
932 if (params.num_ssids + 1 >= max_ssids)
933 break;
934 }
935 ssid = ssid->next;
936 if (ssid == start)
937 break;
938 if (ssid == NULL && max_ssids > 1 &&
939 start != wpa_s->conf->ssid)
940 ssid = wpa_s->conf->ssid;
941 }
942
943 if (wpa_s->scan_id_count &&
944 wpa_s->last_scan_req == MANUAL_SCAN_REQ)
945 wpa_set_scan_ssids(wpa_s, &params, max_ssids);
946
947 for (tssid = wpa_s->conf->ssid;
948 wpa_s->last_scan_req != MANUAL_SCAN_REQ && tssid;
949 tssid = tssid->next) {
950 if (wpas_network_disabled(wpa_s, tssid))
951 continue;
952 if ((params.freqs || !freqs_set) && tssid->scan_freq) {
953 int_array_concat(&params.freqs,
954 tssid->scan_freq);
955 } else {
956 os_free(params.freqs);
957 params.freqs = NULL;
958 }
959 freqs_set = 1;
960 }
961 int_array_sort_unique(params.freqs);
962 }
963
964 if (ssid && max_ssids == 1) {
965 /*
966 * If the driver is limited to 1 SSID at a time interleave
967 * wildcard SSID scans with specific SSID scans to avoid
968 * waiting a long time for a wildcard scan.
969 */
970 if (!wpa_s->prev_scan_wildcard) {
971 params.ssids[0].ssid = NULL;
972 params.ssids[0].ssid_len = 0;
973 wpa_s->prev_scan_wildcard = 1;
974 wpa_dbg(wpa_s, MSG_DEBUG, "Starting AP scan for "
975 "wildcard SSID (Interleave with specific)");
976 } else {
977 wpa_s->prev_scan_ssid = ssid;
978 wpa_s->prev_scan_wildcard = 0;
979 wpa_dbg(wpa_s, MSG_DEBUG,
980 "Starting AP scan for specific SSID: %s",
981 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
982 }
983 } else if (ssid) {
984 /* max_ssids > 1 */
985
986 wpa_s->prev_scan_ssid = ssid;
987 wpa_dbg(wpa_s, MSG_DEBUG, "Include wildcard SSID in "
988 "the scan request");
989 params.num_ssids++;
990 } else if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
991 wpa_s->manual_scan_passive && params.num_ssids == 0) {
992 wpa_dbg(wpa_s, MSG_DEBUG, "Use passive scan based on manual request");
993 } else if (wpa_s->conf->passive_scan) {
994 wpa_dbg(wpa_s, MSG_DEBUG,
995 "Use passive scan based on configuration");
996 } else {
997 wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
998 params.num_ssids++;
999 wpa_dbg(wpa_s, MSG_DEBUG, "Starting AP scan for wildcard "
1000 "SSID");
1001 }
1002
1003 ssid_list_set:
1004 wpa_supplicant_optimize_freqs(wpa_s, &params);
1005 extra_ie = wpa_supplicant_extra_ies(wpa_s);
1006
1007 if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
1008 wpa_s->manual_scan_only_new) {
1009 wpa_printf(MSG_DEBUG,
1010 "Request driver to clear scan cache due to manual only_new=1 scan");
1011 params.only_new_results = 1;
1012 }
1013
1014 if (wpa_s->last_scan_req == MANUAL_SCAN_REQ && params.freqs == NULL &&
1015 wpa_s->manual_scan_freqs) {
1016 wpa_dbg(wpa_s, MSG_DEBUG, "Limit manual scan to specified channels");
1017 params.freqs = wpa_s->manual_scan_freqs;
1018 wpa_s->manual_scan_freqs = NULL;
1019 }
1020
1021 if (params.freqs == NULL && wpa_s->select_network_scan_freqs) {
1022 wpa_dbg(wpa_s, MSG_DEBUG,
1023 "Limit select_network scan to specified channels");
1024 params.freqs = wpa_s->select_network_scan_freqs;
1025 wpa_s->select_network_scan_freqs = NULL;
1026 }
1027
1028 if (params.freqs == NULL && wpa_s->next_scan_freqs) {
1029 wpa_dbg(wpa_s, MSG_DEBUG, "Optimize scan based on previously "
1030 "generated frequency list");
1031 params.freqs = wpa_s->next_scan_freqs;
1032 } else
1033 os_free(wpa_s->next_scan_freqs);
1034 wpa_s->next_scan_freqs = NULL;
1035 wpa_setband_scan_freqs(wpa_s, &params);
1036
1037 /* See if user specified frequencies. If so, scan only those. */
1038 if (wpa_s->conf->freq_list && !params.freqs) {
1039 wpa_dbg(wpa_s, MSG_DEBUG,
1040 "Optimize scan based on conf->freq_list");
1041 int_array_concat(&params.freqs, wpa_s->conf->freq_list);
1042 }
1043
1044 /* Use current associated channel? */
1045 if (wpa_s->conf->scan_cur_freq && !params.freqs) {
1046 unsigned int num = wpa_s->num_multichan_concurrent;
1047
1048 params.freqs = os_calloc(num + 1, sizeof(int));
1049 if (params.freqs) {
1050 num = get_shared_radio_freqs(wpa_s, params.freqs, num);
1051 if (num > 0) {
1052 wpa_dbg(wpa_s, MSG_DEBUG, "Scan only the "
1053 "current operating channels since "
1054 "scan_cur_freq is enabled");
1055 } else {
1056 os_free(params.freqs);
1057 params.freqs = NULL;
1058 }
1059 }
1060 }
1061
1062 params.filter_ssids = wpa_supplicant_build_filter_ssids(
1063 wpa_s->conf, &params.num_filter_ssids);
1064 if (extra_ie) {
1065 params.extra_ies = wpabuf_head(extra_ie);
1066 params.extra_ies_len = wpabuf_len(extra_ie);
1067 }
1068
1069 #ifdef CONFIG_P2P
1070 if (wpa_s->p2p_in_provisioning || wpa_s->p2p_in_invitation ||
1071 (wpa_s->show_group_started && wpa_s->go_params)) {
1072 /*
1073 * The interface may not yet be in P2P mode, so we have to
1074 * explicitly request P2P probe to disable CCK rates.
1075 */
1076 params.p2p_probe = 1;
1077 }
1078 #endif /* CONFIG_P2P */
1079
1080 if ((wpa_s->mac_addr_rand_enable & MAC_ADDR_RAND_SCAN) &&
1081 wpa_s->wpa_state <= WPA_SCANNING) {
1082 params.mac_addr_rand = 1;
1083 if (wpa_s->mac_addr_scan) {
1084 params.mac_addr = wpa_s->mac_addr_scan;
1085 params.mac_addr_mask = wpa_s->mac_addr_scan + ETH_ALEN;
1086 }
1087 }
1088
1089 if (!is_zero_ether_addr(wpa_s->next_scan_bssid)) {
1090 struct wpa_bss *bss;
1091
1092 params.bssid = wpa_s->next_scan_bssid;
1093 bss = wpa_bss_get_bssid_latest(wpa_s, params.bssid);
1094 if (bss && bss->ssid_len && params.num_ssids == 1 &&
1095 params.ssids[0].ssid_len == 0) {
1096 params.ssids[0].ssid = bss->ssid;
1097 params.ssids[0].ssid_len = bss->ssid_len;
1098 wpa_dbg(wpa_s, MSG_DEBUG,
1099 "Scan a previously specified BSSID " MACSTR
1100 " and SSID %s",
1101 MAC2STR(params.bssid),
1102 wpa_ssid_txt(bss->ssid, bss->ssid_len));
1103 } else {
1104 wpa_dbg(wpa_s, MSG_DEBUG,
1105 "Scan a previously specified BSSID " MACSTR,
1106 MAC2STR(params.bssid));
1107 }
1108 }
1109
1110 scan_params = &params;
1111
1112 scan:
1113 #ifdef CONFIG_P2P
1114 /*
1115 * If the driver does not support multi-channel concurrency and a
1116 * virtual interface that shares the same radio with the wpa_s interface
1117 * is operating there may not be need to scan other channels apart from
1118 * the current operating channel on the other virtual interface. Filter
1119 * out other channels in case we are trying to find a connection for a
1120 * station interface when we are not configured to prefer station
1121 * connection and a concurrent operation is already in process.
1122 */
1123 if (wpa_s->scan_for_connection &&
1124 wpa_s->last_scan_req == NORMAL_SCAN_REQ &&
1125 !scan_params->freqs && !params.freqs &&
1126 wpas_is_p2p_prioritized(wpa_s) &&
1127 wpa_s->p2p_group_interface == NOT_P2P_GROUP_INTERFACE &&
1128 non_p2p_network_enabled(wpa_s)) {
1129 unsigned int num = wpa_s->num_multichan_concurrent;
1130
1131 params.freqs = os_calloc(num + 1, sizeof(int));
1132 if (params.freqs) {
1133 num = get_shared_radio_freqs(wpa_s, params.freqs, num);
1134 if (num > 0 && num == wpa_s->num_multichan_concurrent) {
1135 wpa_dbg(wpa_s, MSG_DEBUG, "Scan only the current operating channels since all channels are already used");
1136 } else {
1137 os_free(params.freqs);
1138 params.freqs = NULL;
1139 }
1140 }
1141 }
1142 #endif /* CONFIG_P2P */
1143
1144 ret = wpa_supplicant_trigger_scan(wpa_s, scan_params);
1145
1146 if (ret && wpa_s->last_scan_req == MANUAL_SCAN_REQ && params.freqs &&
1147 !wpa_s->manual_scan_freqs) {
1148 /* Restore manual_scan_freqs for the next attempt */
1149 wpa_s->manual_scan_freqs = params.freqs;
1150 params.freqs = NULL;
1151 }
1152
1153 wpabuf_free(extra_ie);
1154 os_free(params.freqs);
1155 os_free(params.filter_ssids);
1156
1157 if (ret) {
1158 wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate AP scan");
1159 if (wpa_s->scan_prev_wpa_state != wpa_s->wpa_state)
1160 wpa_supplicant_set_state(wpa_s,
1161 wpa_s->scan_prev_wpa_state);
1162 /* Restore scan_req since we will try to scan again */
1163 wpa_s->scan_req = wpa_s->last_scan_req;
1164 wpa_supplicant_req_scan(wpa_s, 1, 0);
1165 } else {
1166 wpa_s->scan_for_connection = 0;
1167 #ifdef CONFIG_INTERWORKING
1168 wpa_s->interworking_fast_assoc_tried = 0;
1169 #endif /* CONFIG_INTERWORKING */
1170 if (params.bssid)
1171 os_memset(wpa_s->next_scan_bssid, 0, ETH_ALEN);
1172 }
1173 }
1174
1175
1176 void wpa_supplicant_update_scan_int(struct wpa_supplicant *wpa_s, int sec)
1177 {
1178 struct os_reltime remaining, new_int;
1179 int cancelled;
1180
1181 cancelled = eloop_cancel_timeout_one(wpa_supplicant_scan, wpa_s, NULL,
1182 &remaining);
1183
1184 new_int.sec = sec;
1185 new_int.usec = 0;
1186 if (cancelled && os_reltime_before(&remaining, &new_int)) {
1187 new_int.sec = remaining.sec;
1188 new_int.usec = remaining.usec;
1189 }
1190
1191 if (cancelled) {
1192 eloop_register_timeout(new_int.sec, new_int.usec,
1193 wpa_supplicant_scan, wpa_s, NULL);
1194 }
1195 wpa_s->scan_interval = sec;
1196 }
1197
1198
1199 /**
1200 * wpa_supplicant_req_scan - Schedule a scan for neighboring access points
1201 * @wpa_s: Pointer to wpa_supplicant data
1202 * @sec: Number of seconds after which to scan
1203 * @usec: Number of microseconds after which to scan
1204 *
1205 * This function is used to schedule a scan for neighboring access points after
1206 * the specified time.
1207 */
1208 void wpa_supplicant_req_scan(struct wpa_supplicant *wpa_s, int sec, int usec)
1209 {
1210 int res;
1211
1212 if (wpa_s->p2p_mgmt) {
1213 wpa_dbg(wpa_s, MSG_DEBUG,
1214 "Ignore scan request (%d.%06d sec) on p2p_mgmt interface",
1215 sec, usec);
1216 return;
1217 }
1218
1219 res = eloop_deplete_timeout(sec, usec, wpa_supplicant_scan, wpa_s,
1220 NULL);
1221 if (res == 1) {
1222 wpa_dbg(wpa_s, MSG_DEBUG, "Rescheduling scan request: %d.%06d sec",
1223 sec, usec);
1224 } else if (res == 0) {
1225 wpa_dbg(wpa_s, MSG_DEBUG, "Ignore new scan request for %d.%06d sec since an earlier request is scheduled to trigger sooner",
1226 sec, usec);
1227 } else {
1228 wpa_dbg(wpa_s, MSG_DEBUG, "Setting scan request: %d.%06d sec",
1229 sec, usec);
1230 eloop_register_timeout(sec, usec, wpa_supplicant_scan, wpa_s, NULL);
1231 }
1232 }
1233
1234
1235 /**
1236 * wpa_supplicant_delayed_sched_scan - Request a delayed scheduled scan
1237 * @wpa_s: Pointer to wpa_supplicant data
1238 * @sec: Number of seconds after which to scan
1239 * @usec: Number of microseconds after which to scan
1240 * Returns: 0 on success or -1 otherwise
1241 *
1242 * This function is used to schedule periodic scans for neighboring
1243 * access points after the specified time.
1244 */
1245 int wpa_supplicant_delayed_sched_scan(struct wpa_supplicant *wpa_s,
1246 int sec, int usec)
1247 {
1248 if (!wpa_s->sched_scan_supported)
1249 return -1;
1250
1251 eloop_register_timeout(sec, usec,
1252 wpa_supplicant_delayed_sched_scan_timeout,
1253 wpa_s, NULL);
1254
1255 return 0;
1256 }
1257
1258
1259 static void
1260 wpa_scan_set_relative_rssi_params(struct wpa_supplicant *wpa_s,
1261 struct wpa_driver_scan_params *params)
1262 {
1263 if (wpa_s->wpa_state != WPA_COMPLETED ||
1264 !(wpa_s->drv_flags & WPA_DRIVER_FLAGS_SCHED_SCAN_RELATIVE_RSSI) ||
1265 wpa_s->srp.relative_rssi_set == 0)
1266 return;
1267
1268 params->relative_rssi_set = 1;
1269 params->relative_rssi = wpa_s->srp.relative_rssi;
1270
1271 if (wpa_s->srp.relative_adjust_rssi == 0)
1272 return;
1273
1274 params->relative_adjust_band = wpa_s->srp.relative_adjust_band;
1275 params->relative_adjust_rssi = wpa_s->srp.relative_adjust_rssi;
1276 }
1277
1278
1279 /**
1280 * wpa_supplicant_req_sched_scan - Start a periodic scheduled scan
1281 * @wpa_s: Pointer to wpa_supplicant data
1282 * Returns: 0 is sched_scan was started or -1 otherwise
1283 *
1284 * This function is used to schedule periodic scans for neighboring
1285 * access points repeating the scan continuously.
1286 */
1287 int wpa_supplicant_req_sched_scan(struct wpa_supplicant *wpa_s)
1288 {
1289 struct wpa_driver_scan_params params;
1290 struct wpa_driver_scan_params *scan_params;
1291 enum wpa_states prev_state;
1292 struct wpa_ssid *ssid = NULL;
1293 struct wpabuf *extra_ie = NULL;
1294 int ret;
1295 unsigned int max_sched_scan_ssids;
1296 int wildcard = 0;
1297 int need_ssids;
1298 struct sched_scan_plan scan_plan;
1299
1300 if (!wpa_s->sched_scan_supported)
1301 return -1;
1302
1303 if (wpa_s->max_sched_scan_ssids > WPAS_MAX_SCAN_SSIDS)
1304 max_sched_scan_ssids = WPAS_MAX_SCAN_SSIDS;
1305 else
1306 max_sched_scan_ssids = wpa_s->max_sched_scan_ssids;
1307 if (max_sched_scan_ssids < 1 || wpa_s->conf->disable_scan_offload)
1308 return -1;
1309
1310 wpa_s->sched_scan_stop_req = 0;
1311
1312 if (wpa_s->sched_scanning) {
1313 wpa_dbg(wpa_s, MSG_DEBUG, "Already sched scanning");
1314 return 0;
1315 }
1316
1317 need_ssids = 0;
1318 for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
1319 if (!wpas_network_disabled(wpa_s, ssid) && !ssid->scan_ssid) {
1320 /* Use wildcard SSID to find this network */
1321 wildcard = 1;
1322 } else if (!wpas_network_disabled(wpa_s, ssid) &&
1323 ssid->ssid_len)
1324 need_ssids++;
1325
1326 #ifdef CONFIG_WPS
1327 if (!wpas_network_disabled(wpa_s, ssid) &&
1328 ssid->key_mgmt == WPA_KEY_MGMT_WPS) {
1329 /*
1330 * Normal scan is more reliable and faster for WPS
1331 * operations and since these are for short periods of
1332 * time, the benefit of trying to use sched_scan would
1333 * be limited.
1334 */
1335 wpa_dbg(wpa_s, MSG_DEBUG, "Use normal scan instead of "
1336 "sched_scan for WPS");
1337 return -1;
1338 }
1339 #endif /* CONFIG_WPS */
1340 }
1341 if (wildcard)
1342 need_ssids++;
1343
1344 if (wpa_s->normal_scans < 3 &&
1345 (need_ssids <= wpa_s->max_scan_ssids ||
1346 wpa_s->max_scan_ssids >= (int) max_sched_scan_ssids)) {
1347 /*
1348 * When normal scan can speed up operations, use that for the
1349 * first operations before starting the sched_scan to allow
1350 * user space sleep more. We do this only if the normal scan
1351 * has functionality that is suitable for this or if the
1352 * sched_scan does not have better support for multiple SSIDs.
1353 */
1354 wpa_dbg(wpa_s, MSG_DEBUG, "Use normal scan instead of "
1355 "sched_scan for initial scans (normal_scans=%d)",
1356 wpa_s->normal_scans);
1357 return -1;
1358 }
1359
1360 os_memset(&params, 0, sizeof(params));
1361
1362 /* If we can't allocate space for the filters, we just don't filter */
1363 params.filter_ssids = os_calloc(wpa_s->max_match_sets,
1364 sizeof(struct wpa_driver_scan_filter));
1365
1366 prev_state = wpa_s->wpa_state;
1367 if (wpa_s->wpa_state == WPA_DISCONNECTED ||
1368 wpa_s->wpa_state == WPA_INACTIVE)
1369 wpa_supplicant_set_state(wpa_s, WPA_SCANNING);
1370
1371 if (wpa_s->autoscan_params != NULL) {
1372 scan_params = wpa_s->autoscan_params;
1373 goto scan;
1374 }
1375
1376 /* Find the starting point from which to continue scanning */
1377 ssid = wpa_s->conf->ssid;
1378 if (wpa_s->prev_sched_ssid) {
1379 while (ssid) {
1380 if (ssid == wpa_s->prev_sched_ssid) {
1381 ssid = ssid->next;
1382 break;
1383 }
1384 ssid = ssid->next;
1385 }
1386 }
1387
1388 if (!ssid || !wpa_s->prev_sched_ssid) {
1389 wpa_dbg(wpa_s, MSG_DEBUG, "Beginning of SSID list");
1390 wpa_s->sched_scan_timeout = max_sched_scan_ssids * 2;
1391 wpa_s->first_sched_scan = 1;
1392 ssid = wpa_s->conf->ssid;
1393 wpa_s->prev_sched_ssid = ssid;
1394 }
1395
1396 if (wildcard) {
1397 wpa_dbg(wpa_s, MSG_DEBUG, "Add wildcard SSID to sched_scan");
1398 params.num_ssids++;
1399 }
1400
1401 while (ssid) {
1402 if (wpas_network_disabled(wpa_s, ssid))
1403 goto next;
1404
1405 if (params.num_filter_ssids < wpa_s->max_match_sets &&
1406 params.filter_ssids && ssid->ssid && ssid->ssid_len) {
1407 wpa_dbg(wpa_s, MSG_DEBUG, "add to filter ssid: %s",
1408 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
1409 os_memcpy(params.filter_ssids[params.num_filter_ssids].ssid,
1410 ssid->ssid, ssid->ssid_len);
1411 params.filter_ssids[params.num_filter_ssids].ssid_len =
1412 ssid->ssid_len;
1413 params.num_filter_ssids++;
1414 } else if (params.filter_ssids && ssid->ssid && ssid->ssid_len)
1415 {
1416 wpa_dbg(wpa_s, MSG_DEBUG, "Not enough room for SSID "
1417 "filter for sched_scan - drop filter");
1418 os_free(params.filter_ssids);
1419 params.filter_ssids = NULL;
1420 params.num_filter_ssids = 0;
1421 }
1422
1423 if (ssid->scan_ssid && ssid->ssid && ssid->ssid_len) {
1424 if (params.num_ssids == max_sched_scan_ssids)
1425 break; /* only room for broadcast SSID */
1426 wpa_dbg(wpa_s, MSG_DEBUG,
1427 "add to active scan ssid: %s",
1428 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
1429 params.ssids[params.num_ssids].ssid =
1430 ssid->ssid;
1431 params.ssids[params.num_ssids].ssid_len =
1432 ssid->ssid_len;
1433 params.num_ssids++;
1434 if (params.num_ssids >= max_sched_scan_ssids) {
1435 wpa_s->prev_sched_ssid = ssid;
1436 do {
1437 ssid = ssid->next;
1438 } while (ssid &&
1439 (wpas_network_disabled(wpa_s, ssid) ||
1440 !ssid->scan_ssid));
1441 break;
1442 }
1443 }
1444
1445 next:
1446 wpa_s->prev_sched_ssid = ssid;
1447 ssid = ssid->next;
1448 }
1449
1450 if (params.num_filter_ssids == 0) {
1451 os_free(params.filter_ssids);
1452 params.filter_ssids = NULL;
1453 }
1454
1455 extra_ie = wpa_supplicant_extra_ies(wpa_s);
1456 if (extra_ie) {
1457 params.extra_ies = wpabuf_head(extra_ie);
1458 params.extra_ies_len = wpabuf_len(extra_ie);
1459 }
1460
1461 if (wpa_s->conf->filter_rssi)
1462 params.filter_rssi = wpa_s->conf->filter_rssi;
1463
1464 /* See if user specified frequencies. If so, scan only those. */
1465 if (wpa_s->conf->freq_list && !params.freqs) {
1466 wpa_dbg(wpa_s, MSG_DEBUG,
1467 "Optimize scan based on conf->freq_list");
1468 int_array_concat(&params.freqs, wpa_s->conf->freq_list);
1469 }
1470
1471 scan_params = &params;
1472
1473 scan:
1474 wpa_s->sched_scan_timed_out = 0;
1475
1476 /*
1477 * We cannot support multiple scan plans if the scan request includes
1478 * too many SSID's, so in this case use only the last scan plan and make
1479 * it run infinitely. It will be stopped by the timeout.
1480 */
1481 if (wpa_s->sched_scan_plans_num == 1 ||
1482 (wpa_s->sched_scan_plans_num && !ssid && wpa_s->first_sched_scan)) {
1483 params.sched_scan_plans = wpa_s->sched_scan_plans;
1484 params.sched_scan_plans_num = wpa_s->sched_scan_plans_num;
1485 } else if (wpa_s->sched_scan_plans_num > 1) {
1486 wpa_dbg(wpa_s, MSG_DEBUG,
1487 "Too many SSIDs. Default to using single scheduled_scan plan");
1488 params.sched_scan_plans =
1489 &wpa_s->sched_scan_plans[wpa_s->sched_scan_plans_num -
1490 1];
1491 params.sched_scan_plans_num = 1;
1492 } else {
1493 if (wpa_s->conf->sched_scan_interval)
1494 scan_plan.interval = wpa_s->conf->sched_scan_interval;
1495 else
1496 scan_plan.interval = 10;
1497
1498 if (scan_plan.interval > wpa_s->max_sched_scan_plan_interval) {
1499 wpa_printf(MSG_WARNING,
1500 "Scan interval too long(%u), use the maximum allowed(%u)",
1501 scan_plan.interval,
1502 wpa_s->max_sched_scan_plan_interval);
1503 scan_plan.interval =
1504 wpa_s->max_sched_scan_plan_interval;
1505 }
1506
1507 scan_plan.iterations = 0;
1508 params.sched_scan_plans = &scan_plan;
1509 params.sched_scan_plans_num = 1;
1510 }
1511
1512 if (ssid || !wpa_s->first_sched_scan) {
1513 wpa_dbg(wpa_s, MSG_DEBUG,
1514 "Starting sched scan: interval %u timeout %d",
1515 params.sched_scan_plans[0].interval,
1516 wpa_s->sched_scan_timeout);
1517 } else {
1518 wpa_dbg(wpa_s, MSG_DEBUG, "Starting sched scan (no timeout)");
1519 }
1520
1521 wpa_setband_scan_freqs(wpa_s, scan_params);
1522
1523 if ((wpa_s->mac_addr_rand_enable & MAC_ADDR_RAND_SCHED_SCAN) &&
1524 wpa_s->wpa_state <= WPA_SCANNING) {
1525 params.mac_addr_rand = 1;
1526 if (wpa_s->mac_addr_sched_scan) {
1527 params.mac_addr = wpa_s->mac_addr_sched_scan;
1528 params.mac_addr_mask = wpa_s->mac_addr_sched_scan +
1529 ETH_ALEN;
1530 }
1531 }
1532
1533 wpa_scan_set_relative_rssi_params(wpa_s, scan_params);
1534
1535 ret = wpa_supplicant_start_sched_scan(wpa_s, scan_params);
1536 wpabuf_free(extra_ie);
1537 os_free(params.filter_ssids);
1538 if (ret) {
1539 wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate sched scan");
1540 if (prev_state != wpa_s->wpa_state)
1541 wpa_supplicant_set_state(wpa_s, prev_state);
1542 return ret;
1543 }
1544
1545 /* If we have more SSIDs to scan, add a timeout so we scan them too */
1546 if (ssid || !wpa_s->first_sched_scan) {
1547 wpa_s->sched_scan_timed_out = 0;
1548 eloop_register_timeout(wpa_s->sched_scan_timeout, 0,
1549 wpa_supplicant_sched_scan_timeout,
1550 wpa_s, NULL);
1551 wpa_s->first_sched_scan = 0;
1552 wpa_s->sched_scan_timeout /= 2;
1553 params.sched_scan_plans[0].interval *= 2;
1554 if ((unsigned int) wpa_s->sched_scan_timeout <
1555 params.sched_scan_plans[0].interval ||
1556 params.sched_scan_plans[0].interval >
1557 wpa_s->max_sched_scan_plan_interval) {
1558 params.sched_scan_plans[0].interval = 10;
1559 wpa_s->sched_scan_timeout = max_sched_scan_ssids * 2;
1560 }
1561 }
1562
1563 /* If there is no more ssids, start next time from the beginning */
1564 if (!ssid)
1565 wpa_s->prev_sched_ssid = NULL;
1566
1567 return 0;
1568 }
1569
1570
1571 /**
1572 * wpa_supplicant_cancel_scan - Cancel a scheduled scan request
1573 * @wpa_s: Pointer to wpa_supplicant data
1574 *
1575 * This function is used to cancel a scan request scheduled with
1576 * wpa_supplicant_req_scan().
1577 */
1578 void wpa_supplicant_cancel_scan(struct wpa_supplicant *wpa_s)
1579 {
1580 wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling scan request");
1581 eloop_cancel_timeout(wpa_supplicant_scan, wpa_s, NULL);
1582 }
1583
1584
1585 /**
1586 * wpa_supplicant_cancel_delayed_sched_scan - Stop a delayed scheduled scan
1587 * @wpa_s: Pointer to wpa_supplicant data
1588 *
1589 * This function is used to stop a delayed scheduled scan.
1590 */
1591 void wpa_supplicant_cancel_delayed_sched_scan(struct wpa_supplicant *wpa_s)
1592 {
1593 if (!wpa_s->sched_scan_supported)
1594 return;
1595
1596 wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling delayed sched scan");
1597 eloop_cancel_timeout(wpa_supplicant_delayed_sched_scan_timeout,
1598 wpa_s, NULL);
1599 }
1600
1601
1602 /**
1603 * wpa_supplicant_cancel_sched_scan - Stop running scheduled scans
1604 * @wpa_s: Pointer to wpa_supplicant data
1605 *
1606 * This function is used to stop a periodic scheduled scan.
1607 */
1608 void wpa_supplicant_cancel_sched_scan(struct wpa_supplicant *wpa_s)
1609 {
1610 if (!wpa_s->sched_scanning)
1611 return;
1612
1613 if (wpa_s->sched_scanning)
1614 wpa_s->sched_scan_stop_req = 1;
1615
1616 wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling sched scan");
1617 eloop_cancel_timeout(wpa_supplicant_sched_scan_timeout, wpa_s, NULL);
1618 wpa_supplicant_stop_sched_scan(wpa_s);
1619 }
1620
1621
1622 /**
1623 * wpa_supplicant_notify_scanning - Indicate possible scan state change
1624 * @wpa_s: Pointer to wpa_supplicant data
1625 * @scanning: Whether scanning is currently in progress
1626 *
1627 * This function is to generate scanning notifycations. It is called whenever
1628 * there may have been a change in scanning (scan started, completed, stopped).
1629 * wpas_notify_scanning() is called whenever the scanning state changed from the
1630 * previously notified state.
1631 */
1632 void wpa_supplicant_notify_scanning(struct wpa_supplicant *wpa_s,
1633 int scanning)
1634 {
1635 if (wpa_s->scanning != scanning) {
1636 wpa_s->scanning = scanning;
1637 wpas_notify_scanning(wpa_s);
1638 }
1639 }
1640
1641
1642 static int wpa_scan_get_max_rate(const struct wpa_scan_res *res)
1643 {
1644 int rate = 0;
1645 const u8 *ie;
1646 int i;
1647
1648 ie = wpa_scan_get_ie(res, WLAN_EID_SUPP_RATES);
1649 for (i = 0; ie && i < ie[1]; i++) {
1650 if ((ie[i + 2] & 0x7f) > rate)
1651 rate = ie[i + 2] & 0x7f;
1652 }
1653
1654 ie = wpa_scan_get_ie(res, WLAN_EID_EXT_SUPP_RATES);
1655 for (i = 0; ie && i < ie[1]; i++) {
1656 if ((ie[i + 2] & 0x7f) > rate)
1657 rate = ie[i + 2] & 0x7f;
1658 }
1659
1660 return rate;
1661 }
1662
1663
1664 /**
1665 * wpa_scan_get_ie - Fetch a specified information element from a scan result
1666 * @res: Scan result entry
1667 * @ie: Information element identitifier (WLAN_EID_*)
1668 * Returns: Pointer to the information element (id field) or %NULL if not found
1669 *
1670 * This function returns the first matching information element in the scan
1671 * result.
1672 */
1673 const u8 * wpa_scan_get_ie(const struct wpa_scan_res *res, u8 ie)
1674 {
1675 size_t ie_len = res->ie_len;
1676
1677 /* Use the Beacon frame IEs if res->ie_len is not available */
1678 if (!ie_len)
1679 ie_len = res->beacon_ie_len;
1680
1681 return get_ie((const u8 *) (res + 1), ie_len, ie);
1682 }
1683
1684
1685 /**
1686 * wpa_scan_get_vendor_ie - Fetch vendor information element from a scan result
1687 * @res: Scan result entry
1688 * @vendor_type: Vendor type (four octets starting the IE payload)
1689 * Returns: Pointer to the information element (id field) or %NULL if not found
1690 *
1691 * This function returns the first matching information element in the scan
1692 * result.
1693 */
1694 const u8 * wpa_scan_get_vendor_ie(const struct wpa_scan_res *res,
1695 u32 vendor_type)
1696 {
1697 const u8 *end, *pos;
1698
1699 pos = (const u8 *) (res + 1);
1700 end = pos + res->ie_len;
1701
1702 while (end - pos > 1) {
1703 if (2 + pos[1] > end - pos)
1704 break;
1705 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1706 vendor_type == WPA_GET_BE32(&pos[2]))
1707 return pos;
1708 pos += 2 + pos[1];
1709 }
1710
1711 return NULL;
1712 }
1713
1714
1715 /**
1716 * wpa_scan_get_vendor_ie_beacon - Fetch vendor information from a scan result
1717 * @res: Scan result entry
1718 * @vendor_type: Vendor type (four octets starting the IE payload)
1719 * Returns: Pointer to the information element (id field) or %NULL if not found
1720 *
1721 * This function returns the first matching information element in the scan
1722 * result.
1723 *
1724 * This function is like wpa_scan_get_vendor_ie(), but uses IE buffer only
1725 * from Beacon frames instead of either Beacon or Probe Response frames.
1726 */
1727 const u8 * wpa_scan_get_vendor_ie_beacon(const struct wpa_scan_res *res,
1728 u32 vendor_type)
1729 {
1730 const u8 *end, *pos;
1731
1732 if (res->beacon_ie_len == 0)
1733 return NULL;
1734
1735 pos = (const u8 *) (res + 1);
1736 pos += res->ie_len;
1737 end = pos + res->beacon_ie_len;
1738
1739 while (end - pos > 1) {
1740 if (2 + pos[1] > end - pos)
1741 break;
1742 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1743 vendor_type == WPA_GET_BE32(&pos[2]))
1744 return pos;
1745 pos += 2 + pos[1];
1746 }
1747
1748 return NULL;
1749 }
1750
1751
1752 /**
1753 * wpa_scan_get_vendor_ie_multi - Fetch vendor IE data from a scan result
1754 * @res: Scan result entry
1755 * @vendor_type: Vendor type (four octets starting the IE payload)
1756 * Returns: Pointer to the information element payload or %NULL if not found
1757 *
1758 * This function returns concatenated payload of possibly fragmented vendor
1759 * specific information elements in the scan result. The caller is responsible
1760 * for freeing the returned buffer.
1761 */
1762 struct wpabuf * wpa_scan_get_vendor_ie_multi(const struct wpa_scan_res *res,
1763 u32 vendor_type)
1764 {
1765 struct wpabuf *buf;
1766 const u8 *end, *pos;
1767
1768 buf = wpabuf_alloc(res->ie_len);
1769 if (buf == NULL)
1770 return NULL;
1771
1772 pos = (const u8 *) (res + 1);
1773 end = pos + res->ie_len;
1774
1775 while (end - pos > 1) {
1776 if (2 + pos[1] > end - pos)
1777 break;
1778 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1779 vendor_type == WPA_GET_BE32(&pos[2]))
1780 wpabuf_put_data(buf, pos + 2 + 4, pos[1] - 4);
1781 pos += 2 + pos[1];
1782 }
1783
1784 if (wpabuf_len(buf) == 0) {
1785 wpabuf_free(buf);
1786 buf = NULL;
1787 }
1788
1789 return buf;
1790 }
1791
1792
1793 /*
1794 * Channels with a great SNR can operate at full rate. What is a great SNR?
1795 * This doc https://supportforums.cisco.com/docs/DOC-12954 says, "the general
1796 * rule of thumb is that any SNR above 20 is good." This one
1797 * http://www.cisco.com/en/US/tech/tk722/tk809/technologies_q_and_a_item09186a00805e9a96.shtml#qa23
1798 * recommends 25 as a minimum SNR for 54 Mbps data rate. The estimates used in
1799 * scan_est_throughput() allow even smaller SNR values for the maximum rates
1800 * (21 for 54 Mbps, 22 for VHT80 MCS9, 24 for HT40 and HT20 MCS7). Use 25 as a
1801 * somewhat conservative value here.
1802 */
1803 #define GREAT_SNR 25
1804
1805 #define IS_5GHZ(n) (n > 4000)
1806
1807 /* Compare function for sorting scan results. Return >0 if @b is considered
1808 * better. */
1809 static int wpa_scan_result_compar(const void *a, const void *b)
1810 {
1811 #define MIN(a,b) a < b ? a : b
1812 struct wpa_scan_res **_wa = (void *) a;
1813 struct wpa_scan_res **_wb = (void *) b;
1814 struct wpa_scan_res *wa = *_wa;
1815 struct wpa_scan_res *wb = *_wb;
1816 int wpa_a, wpa_b;
1817 int snr_a, snr_b, snr_a_full, snr_b_full;
1818
1819 /* WPA/WPA2 support preferred */
1820 wpa_a = wpa_scan_get_vendor_ie(wa, WPA_IE_VENDOR_TYPE) != NULL ||
1821 wpa_scan_get_ie(wa, WLAN_EID_RSN) != NULL;
1822 wpa_b = wpa_scan_get_vendor_ie(wb, WPA_IE_VENDOR_TYPE) != NULL ||
1823 wpa_scan_get_ie(wb, WLAN_EID_RSN) != NULL;
1824
1825 if (wpa_b && !wpa_a)
1826 return 1;
1827 if (!wpa_b && wpa_a)
1828 return -1;
1829
1830 /* privacy support preferred */
1831 if ((wa->caps & IEEE80211_CAP_PRIVACY) == 0 &&
1832 (wb->caps & IEEE80211_CAP_PRIVACY))
1833 return 1;
1834 if ((wa->caps & IEEE80211_CAP_PRIVACY) &&
1835 (wb->caps & IEEE80211_CAP_PRIVACY) == 0)
1836 return -1;
1837
1838 if (wa->flags & wb->flags & WPA_SCAN_LEVEL_DBM) {
1839 snr_a_full = wa->snr;
1840 snr_a = MIN(wa->snr, GREAT_SNR);
1841 snr_b_full = wb->snr;
1842 snr_b = MIN(wb->snr, GREAT_SNR);
1843 } else {
1844 /* Level is not in dBm, so we can't calculate
1845 * SNR. Just use raw level (units unknown). */
1846 snr_a = snr_a_full = wa->level;
1847 snr_b = snr_b_full = wb->level;
1848 }
1849
1850 /* if SNR is close, decide by max rate or frequency band */
1851 if (snr_a && snr_b && abs(snr_b - snr_a) < 7) {
1852 if (wa->est_throughput != wb->est_throughput)
1853 return wb->est_throughput - wa->est_throughput;
1854 }
1855 if ((snr_a && snr_b && abs(snr_b - snr_a) < 5) ||
1856 (wa->qual && wb->qual && abs(wb->qual - wa->qual) < 10)) {
1857 if (IS_5GHZ(wa->freq) ^ IS_5GHZ(wb->freq))
1858 return IS_5GHZ(wa->freq) ? -1 : 1;
1859 }
1860
1861 /* all things being equal, use SNR; if SNRs are
1862 * identical, use quality values since some drivers may only report
1863 * that value and leave the signal level zero */
1864 if (snr_b_full == snr_a_full)
1865 return wb->qual - wa->qual;
1866 return snr_b_full - snr_a_full;
1867 #undef MIN
1868 }
1869
1870
1871 #ifdef CONFIG_WPS
1872 /* Compare function for sorting scan results when searching a WPS AP for
1873 * provisioning. Return >0 if @b is considered better. */
1874 static int wpa_scan_result_wps_compar(const void *a, const void *b)
1875 {
1876 struct wpa_scan_res **_wa = (void *) a;
1877 struct wpa_scan_res **_wb = (void *) b;
1878 struct wpa_scan_res *wa = *_wa;
1879 struct wpa_scan_res *wb = *_wb;
1880 int uses_wps_a, uses_wps_b;
1881 struct wpabuf *wps_a, *wps_b;
1882 int res;
1883
1884 /* Optimization - check WPS IE existence before allocated memory and
1885 * doing full reassembly. */
1886 uses_wps_a = wpa_scan_get_vendor_ie(wa, WPS_IE_VENDOR_TYPE) != NULL;
1887 uses_wps_b = wpa_scan_get_vendor_ie(wb, WPS_IE_VENDOR_TYPE) != NULL;
1888 if (uses_wps_a && !uses_wps_b)
1889 return -1;
1890 if (!uses_wps_a && uses_wps_b)
1891 return 1;
1892
1893 if (uses_wps_a && uses_wps_b) {
1894 wps_a = wpa_scan_get_vendor_ie_multi(wa, WPS_IE_VENDOR_TYPE);
1895 wps_b = wpa_scan_get_vendor_ie_multi(wb, WPS_IE_VENDOR_TYPE);
1896 res = wps_ap_priority_compar(wps_a, wps_b);
1897 wpabuf_free(wps_a);
1898 wpabuf_free(wps_b);
1899 if (res)
1900 return res;
1901 }
1902
1903 /*
1904 * Do not use current AP security policy as a sorting criteria during
1905 * WPS provisioning step since the AP may get reconfigured at the
1906 * completion of provisioning.
1907 */
1908
1909 /* all things being equal, use signal level; if signal levels are
1910 * identical, use quality values since some drivers may only report
1911 * that value and leave the signal level zero */
1912 if (wb->level == wa->level)
1913 return wb->qual - wa->qual;
1914 return wb->level - wa->level;
1915 }
1916 #endif /* CONFIG_WPS */
1917
1918
1919 static void dump_scan_res(struct wpa_scan_results *scan_res)
1920 {
1921 #ifndef CONFIG_NO_STDOUT_DEBUG
1922 size_t i;
1923
1924 if (scan_res->res == NULL || scan_res->num == 0)
1925 return;
1926
1927 wpa_printf(MSG_EXCESSIVE, "Sorted scan results");
1928
1929 for (i = 0; i < scan_res->num; i++) {
1930 struct wpa_scan_res *r = scan_res->res[i];
1931 u8 *pos;
1932 if (r->flags & WPA_SCAN_LEVEL_DBM) {
1933 int noise_valid = !(r->flags & WPA_SCAN_NOISE_INVALID);
1934
1935 wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d "
1936 "noise=%d%s level=%d snr=%d%s flags=0x%x age=%u est=%u",
1937 MAC2STR(r->bssid), r->freq, r->qual,
1938 r->noise, noise_valid ? "" : "~", r->level,
1939 r->snr, r->snr >= GREAT_SNR ? "*" : "",
1940 r->flags,
1941 r->age, r->est_throughput);
1942 } else {
1943 wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d "
1944 "noise=%d level=%d flags=0x%x age=%u est=%u",
1945 MAC2STR(r->bssid), r->freq, r->qual,
1946 r->noise, r->level, r->flags, r->age,
1947 r->est_throughput);
1948 }
1949 pos = (u8 *) (r + 1);
1950 if (r->ie_len)
1951 wpa_hexdump(MSG_EXCESSIVE, "IEs", pos, r->ie_len);
1952 pos += r->ie_len;
1953 if (r->beacon_ie_len)
1954 wpa_hexdump(MSG_EXCESSIVE, "Beacon IEs",
1955 pos, r->beacon_ie_len);
1956 }
1957 #endif /* CONFIG_NO_STDOUT_DEBUG */
1958 }
1959
1960
1961 /**
1962 * wpa_supplicant_filter_bssid_match - Is the specified BSSID allowed
1963 * @wpa_s: Pointer to wpa_supplicant data
1964 * @bssid: BSSID to check
1965 * Returns: 0 if the BSSID is filtered or 1 if not
1966 *
1967 * This function is used to filter out specific BSSIDs from scan reslts mainly
1968 * for testing purposes (SET bssid_filter ctrl_iface command).
1969 */
1970 int wpa_supplicant_filter_bssid_match(struct wpa_supplicant *wpa_s,
1971 const u8 *bssid)
1972 {
1973 size_t i;
1974
1975 if (wpa_s->bssid_filter == NULL)
1976 return 1;
1977
1978 for (i = 0; i < wpa_s->bssid_filter_count; i++) {
1979 if (os_memcmp(wpa_s->bssid_filter + i * ETH_ALEN, bssid,
1980 ETH_ALEN) == 0)
1981 return 1;
1982 }
1983
1984 return 0;
1985 }
1986
1987
1988 void filter_scan_res(struct wpa_supplicant *wpa_s,
1989 struct wpa_scan_results *res)
1990 {
1991 size_t i, j;
1992
1993 if (wpa_s->bssid_filter == NULL)
1994 return;
1995
1996 for (i = 0, j = 0; i < res->num; i++) {
1997 if (wpa_supplicant_filter_bssid_match(wpa_s,
1998 res->res[i]->bssid)) {
1999 res->res[j++] = res->res[i];
2000 } else {
2001 os_free(res->res[i]);
2002 res->res[i] = NULL;
2003 }
2004 }
2005
2006 if (res->num != j) {
2007 wpa_printf(MSG_DEBUG, "Filtered out %d scan results",
2008 (int) (res->num - j));
2009 res->num = j;
2010 }
2011 }
2012
2013
2014 /*
2015 * Noise floor values to use when we have signal strength
2016 * measurements, but no noise floor measurements. These values were
2017 * measured in an office environment with many APs.
2018 */
2019 #define DEFAULT_NOISE_FLOOR_2GHZ (-89)
2020 #define DEFAULT_NOISE_FLOOR_5GHZ (-92)
2021
2022 void scan_snr(struct wpa_scan_res *res)
2023 {
2024 if (res->flags & WPA_SCAN_NOISE_INVALID) {
2025 res->noise = IS_5GHZ(res->freq) ?
2026 DEFAULT_NOISE_FLOOR_5GHZ :
2027 DEFAULT_NOISE_FLOOR_2GHZ;
2028 }
2029
2030 if (res->flags & WPA_SCAN_LEVEL_DBM) {
2031 res->snr = res->level - res->noise;
2032 } else {
2033 /* Level is not in dBm, so we can't calculate
2034 * SNR. Just use raw level (units unknown). */
2035 res->snr = res->level;
2036 }
2037 }
2038
2039
2040 static unsigned int max_ht20_rate(int snr)
2041 {
2042 if (snr < 6)
2043 return 6500; /* HT20 MCS0 */
2044 if (snr < 8)
2045 return 13000; /* HT20 MCS1 */
2046 if (snr < 13)
2047 return 19500; /* HT20 MCS2 */
2048 if (snr < 17)
2049 return 26000; /* HT20 MCS3 */
2050 if (snr < 20)
2051 return 39000; /* HT20 MCS4 */
2052 if (snr < 23)
2053 return 52000; /* HT20 MCS5 */
2054 if (snr < 24)
2055 return 58500; /* HT20 MCS6 */
2056 return 65000; /* HT20 MCS7 */
2057 }
2058
2059
2060 static unsigned int max_ht40_rate(int snr)
2061 {
2062 if (snr < 3)
2063 return 13500; /* HT40 MCS0 */
2064 if (snr < 6)
2065 return 27000; /* HT40 MCS1 */
2066 if (snr < 10)
2067 return 40500; /* HT40 MCS2 */
2068 if (snr < 15)
2069 return 54000; /* HT40 MCS3 */
2070 if (snr < 17)
2071 return 81000; /* HT40 MCS4 */
2072 if (snr < 22)
2073 return 108000; /* HT40 MCS5 */
2074 if (snr < 24)
2075 return 121500; /* HT40 MCS6 */
2076 return 135000; /* HT40 MCS7 */
2077 }
2078
2079
2080 static unsigned int max_vht80_rate(int snr)
2081 {
2082 if (snr < 1)
2083 return 0;
2084 if (snr < 2)
2085 return 29300; /* VHT80 MCS0 */
2086 if (snr < 5)
2087 return 58500; /* VHT80 MCS1 */
2088 if (snr < 9)
2089 return 87800; /* VHT80 MCS2 */
2090 if (snr < 11)
2091 return 117000; /* VHT80 MCS3 */
2092 if (snr < 15)
2093 return 175500; /* VHT80 MCS4 */
2094 if (snr < 16)
2095 return 234000; /* VHT80 MCS5 */
2096 if (snr < 18)
2097 return 263300; /* VHT80 MCS6 */
2098 if (snr < 20)
2099 return 292500; /* VHT80 MCS7 */
2100 if (snr < 22)
2101 return 351000; /* VHT80 MCS8 */
2102 return 390000; /* VHT80 MCS9 */
2103 }
2104
2105
2106 void scan_est_throughput(struct wpa_supplicant *wpa_s,
2107 struct wpa_scan_res *res)
2108 {
2109 enum local_hw_capab capab = wpa_s->hw_capab;
2110 int rate; /* max legacy rate in 500 kb/s units */
2111 const u8 *ie;
2112 unsigned int est, tmp;
2113 int snr = res->snr;
2114
2115 if (res->est_throughput)
2116 return;
2117
2118 /* Get maximum legacy rate */
2119 rate = wpa_scan_get_max_rate(res);
2120
2121 /* Limit based on estimated SNR */
2122 if (rate > 1 * 2 && snr < 1)
2123 rate = 1 * 2;
2124 else if (rate > 2 * 2 && snr < 4)
2125 rate = 2 * 2;
2126 else if (rate > 6 * 2 && snr < 5)
2127 rate = 6 * 2;
2128 else if (rate > 9 * 2 && snr < 6)
2129 rate = 9 * 2;
2130 else if (rate > 12 * 2 && snr < 7)
2131 rate = 12 * 2;
2132 else if (rate > 18 * 2 && snr < 10)
2133 rate = 18 * 2;
2134 else if (rate > 24 * 2 && snr < 11)
2135 rate = 24 * 2;
2136 else if (rate > 36 * 2 && snr < 15)
2137 rate = 36 * 2;
2138 else if (rate > 48 * 2 && snr < 19)
2139 rate = 48 * 2;
2140 else if (rate > 54 * 2 && snr < 21)
2141 rate = 54 * 2;
2142 est = rate * 500;
2143
2144 if (capab == CAPAB_HT || capab == CAPAB_HT40 || capab == CAPAB_VHT) {
2145 ie = wpa_scan_get_ie(res, WLAN_EID_HT_CAP);
2146 if (ie) {
2147 tmp = max_ht20_rate(snr);
2148 if (tmp > est)
2149 est = tmp;
2150 }
2151 }
2152
2153 if (capab == CAPAB_HT40 || capab == CAPAB_VHT) {
2154 ie = wpa_scan_get_ie(res, WLAN_EID_HT_OPERATION);
2155 if (ie && ie[1] >= 2 &&
2156 (ie[3] & HT_INFO_HT_PARAM_SECONDARY_CHNL_OFF_MASK)) {
2157 tmp = max_ht40_rate(snr);
2158 if (tmp > est)
2159 est = tmp;
2160 }
2161 }
2162
2163 if (capab == CAPAB_VHT) {
2164 /* Use +1 to assume VHT is always faster than HT */
2165 ie = wpa_scan_get_ie(res, WLAN_EID_VHT_CAP);
2166 if (ie) {
2167 tmp = max_ht20_rate(snr) + 1;
2168 if (tmp > est)
2169 est = tmp;
2170
2171 ie = wpa_scan_get_ie(res, WLAN_EID_HT_OPERATION);
2172 if (ie && ie[1] >= 2 &&
2173 (ie[3] &
2174 HT_INFO_HT_PARAM_SECONDARY_CHNL_OFF_MASK)) {
2175 tmp = max_ht40_rate(snr) + 1;
2176 if (tmp > est)
2177 est = tmp;
2178 }
2179
2180 ie = wpa_scan_get_ie(res, WLAN_EID_VHT_OPERATION);
2181 if (ie && ie[1] >= 1 &&
2182 (ie[2] & VHT_OPMODE_CHANNEL_WIDTH_MASK)) {
2183 tmp = max_vht80_rate(snr) + 1;
2184 if (tmp > est)
2185 est = tmp;
2186 }
2187 }
2188 }
2189
2190 /* TODO: channel utilization and AP load (e.g., from AP Beacon) */
2191
2192 res->est_throughput = est;
2193 }
2194
2195
2196 /**
2197 * wpa_supplicant_get_scan_results - Get scan results
2198 * @wpa_s: Pointer to wpa_supplicant data
2199 * @info: Information about what was scanned or %NULL if not available
2200 * @new_scan: Whether a new scan was performed
2201 * Returns: Scan results, %NULL on failure
2202 *
2203 * This function request the current scan results from the driver and updates
2204 * the local BSS list wpa_s->bss. The caller is responsible for freeing the
2205 * results with wpa_scan_results_free().
2206 */
2207 struct wpa_scan_results *
2208 wpa_supplicant_get_scan_results(struct wpa_supplicant *wpa_s,
2209 struct scan_info *info, int new_scan)
2210 {
2211 struct wpa_scan_results *scan_res;
2212 size_t i;
2213 int (*compar)(const void *, const void *) = wpa_scan_result_compar;
2214
2215 scan_res = wpa_drv_get_scan_results2(wpa_s);
2216 if (scan_res == NULL) {
2217 wpa_dbg(wpa_s, MSG_DEBUG, "Failed to get scan results");
2218 return NULL;
2219 }
2220 if (scan_res->fetch_time.sec == 0) {
2221 /*
2222 * Make sure we have a valid timestamp if the driver wrapper
2223 * does not set this.
2224 */
2225 os_get_reltime(&scan_res->fetch_time);
2226 }
2227 filter_scan_res(wpa_s, scan_res);
2228
2229 for (i = 0; i < scan_res->num; i++) {
2230 struct wpa_scan_res *scan_res_item = scan_res->res[i];
2231
2232 scan_snr(scan_res_item);
2233 scan_est_throughput(wpa_s, scan_res_item);
2234 }
2235
2236 #ifdef CONFIG_WPS
2237 if (wpas_wps_searching(wpa_s)) {
2238 wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Order scan results with WPS "
2239 "provisioning rules");
2240 compar = wpa_scan_result_wps_compar;
2241 }
2242 #endif /* CONFIG_WPS */
2243
2244 if (scan_res->res) {
2245 qsort(scan_res->res, scan_res->num,
2246 sizeof(struct wpa_scan_res *), compar);
2247 }
2248 dump_scan_res(scan_res);
2249
2250 if (wpa_s->ignore_post_flush_scan_res) {
2251 /* FLUSH command aborted an ongoing scan and these are the
2252 * results from the aborted scan. Do not process the results to
2253 * maintain flushed state. */
2254 wpa_dbg(wpa_s, MSG_DEBUG,
2255 "Do not update BSS table based on pending post-FLUSH scan results");
2256 wpa_s->ignore_post_flush_scan_res = 0;
2257 return scan_res;
2258 }
2259
2260 wpa_bss_update_start(wpa_s);
2261 for (i = 0; i < scan_res->num; i++)
2262 wpa_bss_update_scan_res(wpa_s, scan_res->res[i],
2263 &scan_res->fetch_time);
2264 wpa_bss_update_end(wpa_s, info, new_scan);
2265
2266 return scan_res;
2267 }
2268
2269
2270 /**
2271 * wpa_supplicant_update_scan_results - Update scan results from the driver
2272 * @wpa_s: Pointer to wpa_supplicant data
2273 * Returns: 0 on success, -1 on failure
2274 *
2275 * This function updates the BSS table within wpa_supplicant based on the
2276 * currently available scan results from the driver without requesting a new
2277 * scan. This is used in cases where the driver indicates an association
2278 * (including roaming within ESS) and wpa_supplicant does not yet have the
2279 * needed information to complete the connection (e.g., to perform validation
2280 * steps in 4-way handshake).
2281 */
2282 int wpa_supplicant_update_scan_results(struct wpa_supplicant *wpa_s)
2283 {
2284 struct wpa_scan_results *scan_res;
2285 scan_res = wpa_supplicant_get_scan_results(wpa_s, NULL, 0);
2286 if (scan_res == NULL)
2287 return -1;
2288 wpa_scan_results_free(scan_res);
2289
2290 return 0;
2291 }
2292
2293
2294 /**
2295 * scan_only_handler - Reports scan results
2296 */
2297 void scan_only_handler(struct wpa_supplicant *wpa_s,
2298 struct wpa_scan_results *scan_res)
2299 {
2300 wpa_dbg(wpa_s, MSG_DEBUG, "Scan-only results received");
2301 if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
2302 wpa_s->manual_scan_use_id && wpa_s->own_scan_running) {
2303 wpa_msg_ctrl(wpa_s, MSG_INFO, WPA_EVENT_SCAN_RESULTS "id=%u",
2304 wpa_s->manual_scan_id);
2305 wpa_s->manual_scan_use_id = 0;
2306 } else {
2307 wpa_msg_ctrl(wpa_s, MSG_INFO, WPA_EVENT_SCAN_RESULTS);
2308 }
2309 wpas_notify_scan_results(wpa_s);
2310 wpas_notify_scan_done(wpa_s, 1);
2311 if (wpa_s->scan_work) {
2312 struct wpa_radio_work *work = wpa_s->scan_work;
2313 wpa_s->scan_work = NULL;
2314 radio_work_done(work);
2315 }
2316
2317 if (wpa_s->wpa_state == WPA_SCANNING)
2318 wpa_supplicant_set_state(wpa_s, wpa_s->scan_prev_wpa_state);
2319 }
2320
2321
2322 int wpas_scan_scheduled(struct wpa_supplicant *wpa_s)
2323 {
2324 return eloop_is_timeout_registered(wpa_supplicant_scan, wpa_s, NULL);
2325 }
2326
2327
2328 struct wpa_driver_scan_params *
2329 wpa_scan_clone_params(const struct wpa_driver_scan_params *src)
2330 {
2331 struct wpa_driver_scan_params *params;
2332 size_t i;
2333 u8 *n;
2334
2335 params = os_zalloc(sizeof(*params));
2336 if (params == NULL)
2337 return NULL;
2338
2339 for (i = 0; i < src->num_ssids; i++) {
2340 if (src->ssids[i].ssid) {
2341 n = os_malloc(src->ssids[i].ssid_len);
2342 if (n == NULL)
2343 goto failed;
2344 os_memcpy(n, src->ssids[i].ssid,
2345 src->ssids[i].ssid_len);
2346 params->ssids[i].ssid = n;
2347 params->ssids[i].ssid_len = src->ssids[i].ssid_len;
2348 }
2349 }
2350 params->num_ssids = src->num_ssids;
2351
2352 if (src->extra_ies) {
2353 n = os_malloc(src->extra_ies_len);
2354 if (n == NULL)
2355 goto failed;
2356 os_memcpy(n, src->extra_ies, src->extra_ies_len);
2357 params->extra_ies = n;
2358 params->extra_ies_len = src->extra_ies_len;
2359 }
2360
2361 if (src->freqs) {
2362 int len = int_array_len(src->freqs);
2363 params->freqs = os_malloc((len + 1) * sizeof(int));
2364 if (params->freqs == NULL)
2365 goto failed;
2366 os_memcpy(params->freqs, src->freqs, (len + 1) * sizeof(int));
2367 }
2368
2369 if (src->filter_ssids) {
2370 params->filter_ssids = os_malloc(sizeof(*params->filter_ssids) *
2371 src->num_filter_ssids);
2372 if (params->filter_ssids == NULL)
2373 goto failed;
2374 os_memcpy(params->filter_ssids, src->filter_ssids,
2375 sizeof(*params->filter_ssids) *
2376 src->num_filter_ssids);
2377 params->num_filter_ssids = src->num_filter_ssids;
2378 }
2379
2380 params->filter_rssi = src->filter_rssi;
2381 params->p2p_probe = src->p2p_probe;
2382 params->only_new_results = src->only_new_results;
2383 params->low_priority = src->low_priority;
2384 params->duration = src->duration;
2385 params->duration_mandatory = src->duration_mandatory;
2386
2387 if (src->sched_scan_plans_num > 0) {
2388 params->sched_scan_plans =
2389 os_malloc(sizeof(*src->sched_scan_plans) *
2390 src->sched_scan_plans_num);
2391 if (!params->sched_scan_plans)
2392 goto failed;
2393
2394 os_memcpy(params->sched_scan_plans, src->sched_scan_plans,
2395 sizeof(*src->sched_scan_plans) *
2396 src->sched_scan_plans_num);
2397 params->sched_scan_plans_num = src->sched_scan_plans_num;
2398 }
2399
2400 if (src->mac_addr_rand) {
2401 params->mac_addr_rand = src->mac_addr_rand;
2402
2403 if (src->mac_addr && src->mac_addr_mask) {
2404 u8 *mac_addr;
2405
2406 mac_addr = os_malloc(2 * ETH_ALEN);
2407 if (!mac_addr)
2408 goto failed;
2409
2410 os_memcpy(mac_addr, src->mac_addr, ETH_ALEN);
2411 os_memcpy(mac_addr + ETH_ALEN, src->mac_addr_mask,
2412 ETH_ALEN);
2413 params->mac_addr = mac_addr;
2414 params->mac_addr_mask = mac_addr + ETH_ALEN;
2415 }
2416 }
2417
2418 if (src->bssid) {
2419 u8 *bssid;
2420
2421 bssid = os_malloc(ETH_ALEN);
2422 if (!bssid)
2423 goto failed;
2424 os_memcpy(bssid, src->bssid, ETH_ALEN);
2425 params->bssid = bssid;
2426 }
2427
2428 params->relative_rssi_set = src->relative_rssi_set;
2429 params->relative_rssi = src->relative_rssi;
2430 params->relative_adjust_band = src->relative_adjust_band;
2431 params->relative_adjust_rssi = src->relative_adjust_rssi;
2432 return params;
2433
2434 failed:
2435 wpa_scan_free_params(params);
2436 return NULL;
2437 }
2438
2439
2440 void wpa_scan_free_params(struct wpa_driver_scan_params *params)
2441 {
2442 size_t i;
2443
2444 if (params == NULL)
2445 return;
2446
2447 for (i = 0; i < params->num_ssids; i++)
2448 os_free((u8 *) params->ssids[i].ssid);
2449 os_free((u8 *) params->extra_ies);
2450 os_free(params->freqs);
2451 os_free(params->filter_ssids);
2452 os_free(params->sched_scan_plans);
2453
2454 /*
2455 * Note: params->mac_addr_mask points to same memory allocation and
2456 * must not be freed separately.
2457 */
2458 os_free((u8 *) params->mac_addr);
2459
2460 os_free((u8 *) params->bssid);
2461
2462 os_free(params);
2463 }
2464
2465
2466 int wpas_start_pno(struct wpa_supplicant *wpa_s)
2467 {
2468 int ret, prio;
2469 size_t i, num_ssid, num_match_ssid;
2470 struct wpa_ssid *ssid;
2471 struct wpa_driver_scan_params params;
2472 struct sched_scan_plan scan_plan;
2473 unsigned int max_sched_scan_ssids;
2474
2475 if (!wpa_s->sched_scan_supported)
2476 return -1;
2477
2478 if (wpa_s->max_sched_scan_ssids > WPAS_MAX_SCAN_SSIDS)
2479 max_sched_scan_ssids = WPAS_MAX_SCAN_SSIDS;
2480 else
2481 max_sched_scan_ssids = wpa_s->max_sched_scan_ssids;
2482 if (max_sched_scan_ssids < 1)
2483 return -1;
2484
2485 if (wpa_s->pno || wpa_s->pno_sched_pending)
2486 return 0;
2487
2488 if ((wpa_s->wpa_state > WPA_SCANNING) &&
2489 (wpa_s->wpa_state < WPA_COMPLETED)) {
2490 wpa_printf(MSG_ERROR, "PNO: In assoc process");
2491 return -EAGAIN;
2492 }
2493
2494 if (wpa_s->wpa_state == WPA_SCANNING) {
2495 wpa_supplicant_cancel_scan(wpa_s);
2496 if (wpa_s->sched_scanning) {
2497 wpa_printf(MSG_DEBUG, "Schedule PNO on completion of "
2498 "ongoing sched scan");
2499 wpa_supplicant_cancel_sched_scan(wpa_s);
2500 wpa_s->pno_sched_pending = 1;
2501 return 0;
2502 }
2503 }
2504
2505 if (wpa_s->sched_scan_stop_req) {
2506 wpa_printf(MSG_DEBUG,
2507 "Schedule PNO after previous sched scan has stopped");
2508 wpa_s->pno_sched_pending = 1;
2509 return 0;
2510 }
2511
2512 os_memset(&params, 0, sizeof(params));
2513
2514 num_ssid = num_match_ssid = 0;
2515 ssid = wpa_s->conf->ssid;
2516 while (ssid) {
2517 if (!wpas_network_disabled(wpa_s, ssid)) {
2518 num_match_ssid++;
2519 if (ssid->scan_ssid)
2520 num_ssid++;
2521 }
2522 ssid = ssid->next;
2523 }
2524
2525 if (num_match_ssid == 0) {
2526 wpa_printf(MSG_DEBUG, "PNO: No configured SSIDs");
2527 return -1;
2528 }
2529
2530 if (num_match_ssid > num_ssid) {
2531 params.num_ssids++; /* wildcard */
2532 num_ssid++;
2533 }
2534
2535 if (num_ssid > max_sched_scan_ssids) {
2536 wpa_printf(MSG_DEBUG, "PNO: Use only the first %u SSIDs from "
2537 "%u", max_sched_scan_ssids, (unsigned int) num_ssid);
2538 num_ssid = max_sched_scan_ssids;
2539 }
2540
2541 if (num_match_ssid > wpa_s->max_match_sets) {
2542 num_match_ssid = wpa_s->max_match_sets;
2543 wpa_dbg(wpa_s, MSG_DEBUG, "PNO: Too many SSIDs to match");
2544 }
2545 params.filter_ssids = os_calloc(num_match_ssid,
2546 sizeof(struct wpa_driver_scan_filter));
2547 if (params.filter_ssids == NULL)
2548 return -1;
2549
2550 i = 0;
2551 prio = 0;
2552 ssid = wpa_s->conf->pssid[prio];
2553 while (ssid) {
2554 if (!wpas_network_disabled(wpa_s, ssid)) {
2555 if (ssid->scan_ssid && params.num_ssids < num_ssid) {
2556 params.ssids[params.num_ssids].ssid =
2557 ssid->ssid;
2558 params.ssids[params.num_ssids].ssid_len =
2559 ssid->ssid_len;
2560 params.num_ssids++;
2561 }
2562 os_memcpy(params.filter_ssids[i].ssid, ssid->ssid,
2563 ssid->ssid_len);
2564 params.filter_ssids[i].ssid_len = ssid->ssid_len;
2565 params.num_filter_ssids++;
2566 i++;
2567 if (i == num_match_ssid)
2568 break;
2569 }
2570 if (ssid->pnext)
2571 ssid = ssid->pnext;
2572 else if (prio + 1 == wpa_s->conf->num_prio)
2573 break;
2574 else
2575 ssid = wpa_s->conf->pssid[++prio];
2576 }
2577
2578 if (wpa_s->conf->filter_rssi)
2579 params.filter_rssi = wpa_s->conf->filter_rssi;
2580
2581 if (wpa_s->sched_scan_plans_num) {
2582 params.sched_scan_plans = wpa_s->sched_scan_plans;
2583 params.sched_scan_plans_num = wpa_s->sched_scan_plans_num;
2584 } else {
2585 /* Set one scan plan that will run infinitely */
2586 if (wpa_s->conf->sched_scan_interval)
2587 scan_plan.interval = wpa_s->conf->sched_scan_interval;
2588 else
2589 scan_plan.interval = 10;
2590
2591 scan_plan.iterations = 0;
2592 params.sched_scan_plans = &scan_plan;
2593 params.sched_scan_plans_num = 1;
2594 }
2595
2596 if (params.freqs == NULL && wpa_s->manual_sched_scan_freqs) {
2597 wpa_dbg(wpa_s, MSG_DEBUG, "Limit sched scan to specified channels");
2598 params.freqs = wpa_s->manual_sched_scan_freqs;
2599 }
2600
2601 if ((wpa_s->mac_addr_rand_enable & MAC_ADDR_RAND_PNO) &&
2602 wpa_s->wpa_state <= WPA_SCANNING) {
2603 params.mac_addr_rand = 1;
2604 if (wpa_s->mac_addr_pno) {
2605 params.mac_addr = wpa_s->mac_addr_pno;
2606 params.mac_addr_mask = wpa_s->mac_addr_pno + ETH_ALEN;
2607 }
2608 }
2609
2610 wpa_scan_set_relative_rssi_params(wpa_s, &params);
2611
2612 ret = wpa_supplicant_start_sched_scan(wpa_s, &params);
2613 os_free(params.filter_ssids);
2614 if (ret == 0)
2615 wpa_s->pno = 1;
2616 else
2617 wpa_msg(wpa_s, MSG_ERROR, "Failed to schedule PNO");
2618 return ret;
2619 }
2620
2621
2622 int wpas_stop_pno(struct wpa_supplicant *wpa_s)
2623 {
2624 int ret = 0;
2625
2626 if (!wpa_s->pno)
2627 return 0;
2628
2629 ret = wpa_supplicant_stop_sched_scan(wpa_s);
2630 wpa_s->sched_scan_stop_req = 1;
2631
2632 wpa_s->pno = 0;
2633 wpa_s->pno_sched_pending = 0;
2634
2635 if (wpa_s->wpa_state == WPA_SCANNING)
2636 wpa_supplicant_req_scan(wpa_s, 0, 0);
2637
2638 return ret;
2639 }
2640
2641
2642 void wpas_mac_addr_rand_scan_clear(struct wpa_supplicant *wpa_s,
2643 unsigned int type)
2644 {
2645 type &= MAC_ADDR_RAND_ALL;
2646 wpa_s->mac_addr_rand_enable &= ~type;
2647
2648 if (type & MAC_ADDR_RAND_SCAN) {
2649 os_free(wpa_s->mac_addr_scan);
2650 wpa_s->mac_addr_scan = NULL;
2651 }
2652
2653 if (type & MAC_ADDR_RAND_SCHED_SCAN) {
2654 os_free(wpa_s->mac_addr_sched_scan);
2655 wpa_s->mac_addr_sched_scan = NULL;
2656 }
2657
2658 if (type & MAC_ADDR_RAND_PNO) {
2659 os_free(wpa_s->mac_addr_pno);
2660 wpa_s->mac_addr_pno = NULL;
2661 }
2662 }
2663
2664
2665 int wpas_mac_addr_rand_scan_set(struct wpa_supplicant *wpa_s,
2666 unsigned int type, const u8 *addr,
2667 const u8 *mask)
2668 {
2669 u8 *tmp = NULL;
2670
2671 wpas_mac_addr_rand_scan_clear(wpa_s, type);
2672
2673 if (addr) {
2674 tmp = os_malloc(2 * ETH_ALEN);
2675 if (!tmp)
2676 return -1;
2677 os_memcpy(tmp, addr, ETH_ALEN);
2678 os_memcpy(tmp + ETH_ALEN, mask, ETH_ALEN);
2679 }
2680
2681 if (type == MAC_ADDR_RAND_SCAN) {
2682 wpa_s->mac_addr_scan = tmp;
2683 } else if (type == MAC_ADDR_RAND_SCHED_SCAN) {
2684 wpa_s->mac_addr_sched_scan = tmp;
2685 } else if (type == MAC_ADDR_RAND_PNO) {
2686 wpa_s->mac_addr_pno = tmp;
2687 } else {
2688 wpa_printf(MSG_INFO,
2689 "scan: Invalid MAC randomization type=0x%x",
2690 type);
2691 os_free(tmp);
2692 return -1;
2693 }
2694
2695 wpa_s->mac_addr_rand_enable |= type;
2696 return 0;
2697 }
2698
2699
2700 int wpas_abort_ongoing_scan(struct wpa_supplicant *wpa_s)
2701 {
2702 struct wpa_radio_work *work;
2703 struct wpa_radio *radio = wpa_s->radio;
2704
2705 dl_list_for_each(work, &radio->work, struct wpa_radio_work, list) {
2706 if (work->wpa_s != wpa_s || !work->started ||
2707 (os_strcmp(work->type, "scan") != 0 &&
2708 os_strcmp(work->type, "p2p-scan") != 0))
2709 continue;
2710 wpa_dbg(wpa_s, MSG_DEBUG, "Abort an ongoing scan");
2711 return wpa_drv_abort_scan(wpa_s, wpa_s->curr_scan_cookie);
2712 }
2713
2714 wpa_dbg(wpa_s, MSG_DEBUG, "No ongoing scan/p2p-scan found to abort");
2715 return -1;
2716 }
2717
2718
2719 int wpas_sched_scan_plans_set(struct wpa_supplicant *wpa_s, const char *cmd)
2720 {
2721 struct sched_scan_plan *scan_plans = NULL;
2722 const char *token, *context = NULL;
2723 unsigned int num = 0;
2724
2725 if (!cmd)
2726 return -1;
2727
2728 if (!cmd[0]) {
2729 wpa_printf(MSG_DEBUG, "Clear sched scan plans");
2730 os_free(wpa_s->sched_scan_plans);
2731 wpa_s->sched_scan_plans = NULL;
2732 wpa_s->sched_scan_plans_num = 0;
2733 return 0;
2734 }
2735
2736 while ((token = cstr_token(cmd, " ", &context))) {
2737 int ret;
2738 struct sched_scan_plan *scan_plan, *n;
2739
2740 n = os_realloc_array(scan_plans, num + 1, sizeof(*scan_plans));
2741 if (!n)
2742 goto fail;
2743
2744 scan_plans = n;
2745 scan_plan = &scan_plans[num];
2746 num++;
2747
2748 ret = sscanf(token, "%u:%u", &scan_plan->interval,
2749 &scan_plan->iterations);
2750 if (ret <= 0 || ret > 2 || !scan_plan->interval) {
2751 wpa_printf(MSG_ERROR,
2752 "Invalid sched scan plan input: %s", token);
2753 goto fail;
2754 }
2755
2756 if (scan_plan->interval > wpa_s->max_sched_scan_plan_interval) {
2757 wpa_printf(MSG_WARNING,
2758 "scan plan %u: Scan interval too long(%u), use the maximum allowed(%u)",
2759 num, scan_plan->interval,
2760 wpa_s->max_sched_scan_plan_interval);
2761 scan_plan->interval =
2762 wpa_s->max_sched_scan_plan_interval;
2763 }
2764
2765 if (ret == 1) {
2766 scan_plan->iterations = 0;
2767 break;
2768 }
2769
2770 if (!scan_plan->iterations) {
2771 wpa_printf(MSG_ERROR,
2772 "scan plan %u: Number of iterations cannot be zero",
2773 num);
2774 goto fail;
2775 }
2776
2777 if (scan_plan->iterations >
2778 wpa_s->max_sched_scan_plan_iterations) {
2779 wpa_printf(MSG_WARNING,
2780 "scan plan %u: Too many iterations(%u), use the maximum allowed(%u)",
2781 num, scan_plan->iterations,
2782 wpa_s->max_sched_scan_plan_iterations);
2783 scan_plan->iterations =
2784 wpa_s->max_sched_scan_plan_iterations;
2785 }
2786
2787 wpa_printf(MSG_DEBUG,
2788 "scan plan %u: interval=%u iterations=%u",
2789 num, scan_plan->interval, scan_plan->iterations);
2790 }
2791
2792 if (!scan_plans) {
2793 wpa_printf(MSG_ERROR, "Invalid scan plans entry");
2794 goto fail;
2795 }
2796
2797 if (cstr_token(cmd, " ", &context) || scan_plans[num - 1].iterations) {
2798 wpa_printf(MSG_ERROR,
2799 "All scan plans but the last must specify a number of iterations");
2800 goto fail;
2801 }
2802
2803 wpa_printf(MSG_DEBUG, "scan plan %u (last plan): interval=%u",
2804 num, scan_plans[num - 1].interval);
2805
2806 if (num > wpa_s->max_sched_scan_plans) {
2807 wpa_printf(MSG_WARNING,
2808 "Too many scheduled scan plans (only %u supported)",
2809 wpa_s->max_sched_scan_plans);
2810 wpa_printf(MSG_WARNING,
2811 "Use only the first %u scan plans, and the last one (in infinite loop)",
2812 wpa_s->max_sched_scan_plans - 1);
2813 os_memcpy(&scan_plans[wpa_s->max_sched_scan_plans - 1],
2814 &scan_plans[num - 1], sizeof(*scan_plans));
2815 num = wpa_s->max_sched_scan_plans;
2816 }
2817
2818 os_free(wpa_s->sched_scan_plans);
2819 wpa_s->sched_scan_plans = scan_plans;
2820 wpa_s->sched_scan_plans_num = num;
2821
2822 return 0;
2823
2824 fail:
2825 os_free(scan_plans);
2826 wpa_printf(MSG_ERROR, "invalid scan plans list");
2827 return -1;
2828 }
2829
2830
2831 /**
2832 * wpas_scan_reset_sched_scan - Reset sched_scan state
2833 * @wpa_s: Pointer to wpa_supplicant data
2834 *
2835 * This function is used to cancel a running scheduled scan and to reset an
2836 * internal scan state to continue with a regular scan on the following
2837 * wpa_supplicant_req_scan() calls.
2838 */
2839 void wpas_scan_reset_sched_scan(struct wpa_supplicant *wpa_s)
2840 {
2841 wpa_s->normal_scans = 0;
2842 if (wpa_s->sched_scanning) {
2843 wpa_s->sched_scan_timed_out = 0;
2844 wpa_s->prev_sched_ssid = NULL;
2845 wpa_supplicant_cancel_sched_scan(wpa_s);
2846 }
2847 }
2848
2849
2850 void wpas_scan_restart_sched_scan(struct wpa_supplicant *wpa_s)
2851 {
2852 /* simulate timeout to restart the sched scan */
2853 wpa_s->sched_scan_timed_out = 1;
2854 wpa_s->prev_sched_ssid = NULL;
2855 wpa_supplicant_cancel_sched_scan(wpa_s);
2856 }
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