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EAP: Increase the maximum number of message exchanges
[thirdparty/hostap.git] / wpa_supplicant / scan.c
1 /*
2 * WPA Supplicant - Scanning
3 * Copyright (c) 2003-2019, 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 int min_temp_disabled = 0;
121
122 while (ssid) {
123 if (!wpas_network_disabled(wpa_s, ssid)) {
124 int temp_disabled = wpas_temp_disabled(wpa_s, ssid);
125
126 if (temp_disabled <= 0)
127 break;
128
129 if (!min_temp_disabled ||
130 temp_disabled < min_temp_disabled)
131 min_temp_disabled = temp_disabled;
132 }
133 ssid = ssid->next;
134 }
135
136 /* ap_scan=2 mode - try to associate with each SSID. */
137 if (ssid == NULL) {
138 wpa_dbg(wpa_s, MSG_DEBUG, "wpa_supplicant_assoc_try: Reached "
139 "end of scan list - go back to beginning");
140 wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
141 wpa_supplicant_req_scan(wpa_s, min_temp_disabled, 0);
142 return;
143 }
144 if (ssid->next) {
145 /* Continue from the next SSID on the next attempt. */
146 wpa_s->prev_scan_ssid = ssid;
147 } else {
148 /* Start from the beginning of the SSID list. */
149 wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
150 }
151 wpa_supplicant_associate(wpa_s, NULL, ssid);
152 }
153
154
155 static void wpas_trigger_scan_cb(struct wpa_radio_work *work, int deinit)
156 {
157 struct wpa_supplicant *wpa_s = work->wpa_s;
158 struct wpa_driver_scan_params *params = work->ctx;
159 int ret;
160
161 if (deinit) {
162 if (!work->started) {
163 wpa_scan_free_params(params);
164 return;
165 }
166 wpa_supplicant_notify_scanning(wpa_s, 0);
167 wpas_notify_scan_done(wpa_s, 0);
168 wpa_s->scan_work = NULL;
169 return;
170 }
171
172 if (wpas_update_random_addr_disassoc(wpa_s) < 0) {
173 wpa_msg(wpa_s, MSG_INFO,
174 "Failed to assign random MAC address for a scan");
175 wpa_scan_free_params(params);
176 wpa_msg(wpa_s, MSG_INFO, WPA_EVENT_SCAN_FAILED "ret=-1");
177 radio_work_done(work);
178 return;
179 }
180
181 wpa_supplicant_notify_scanning(wpa_s, 1);
182
183 if (wpa_s->clear_driver_scan_cache) {
184 wpa_printf(MSG_DEBUG,
185 "Request driver to clear scan cache due to local BSS flush");
186 params->only_new_results = 1;
187 }
188 ret = wpa_drv_scan(wpa_s, params);
189 /*
190 * Store the obtained vendor scan cookie (if any) in wpa_s context.
191 * The current design is to allow only one scan request on each
192 * interface, hence having this scan cookie stored in wpa_s context is
193 * fine for now.
194 *
195 * Revisit this logic if concurrent scan operations per interface
196 * is supported.
197 */
198 if (ret == 0)
199 wpa_s->curr_scan_cookie = params->scan_cookie;
200 wpa_scan_free_params(params);
201 work->ctx = NULL;
202 if (ret) {
203 int retry = wpa_s->last_scan_req != MANUAL_SCAN_REQ &&
204 !wpa_s->beacon_rep_data.token;
205
206 if (wpa_s->disconnected)
207 retry = 0;
208
209 wpa_supplicant_notify_scanning(wpa_s, 0);
210 wpas_notify_scan_done(wpa_s, 0);
211 if (wpa_s->wpa_state == WPA_SCANNING)
212 wpa_supplicant_set_state(wpa_s,
213 wpa_s->scan_prev_wpa_state);
214 wpa_msg(wpa_s, MSG_INFO, WPA_EVENT_SCAN_FAILED "ret=%d%s",
215 ret, retry ? " retry=1" : "");
216 radio_work_done(work);
217
218 if (retry) {
219 /* Restore scan_req since we will try to scan again */
220 wpa_s->scan_req = wpa_s->last_scan_req;
221 wpa_supplicant_req_scan(wpa_s, 1, 0);
222 } else if (wpa_s->scan_res_handler) {
223 /* Clear the scan_res_handler */
224 wpa_s->scan_res_handler = NULL;
225 }
226
227 if (wpa_s->beacon_rep_data.token)
228 wpas_rrm_refuse_request(wpa_s);
229
230 return;
231 }
232
233 os_get_reltime(&wpa_s->scan_trigger_time);
234 wpa_s->scan_runs++;
235 wpa_s->normal_scans++;
236 wpa_s->own_scan_requested = 1;
237 wpa_s->clear_driver_scan_cache = 0;
238 wpa_s->scan_work = work;
239 }
240
241
242 /**
243 * wpa_supplicant_trigger_scan - Request driver to start a scan
244 * @wpa_s: Pointer to wpa_supplicant data
245 * @params: Scan parameters
246 * Returns: 0 on success, -1 on failure
247 */
248 int wpa_supplicant_trigger_scan(struct wpa_supplicant *wpa_s,
249 struct wpa_driver_scan_params *params)
250 {
251 struct wpa_driver_scan_params *ctx;
252
253 if (wpa_s->scan_work) {
254 wpa_dbg(wpa_s, MSG_INFO, "Reject scan trigger since one is already pending");
255 return -1;
256 }
257
258 ctx = wpa_scan_clone_params(params);
259 if (!ctx ||
260 radio_add_work(wpa_s, 0, "scan", 0, wpas_trigger_scan_cb, ctx) < 0)
261 {
262 wpa_scan_free_params(ctx);
263 wpa_msg(wpa_s, MSG_INFO, WPA_EVENT_SCAN_FAILED "ret=-1");
264 return -1;
265 }
266
267 return 0;
268 }
269
270
271 static void
272 wpa_supplicant_delayed_sched_scan_timeout(void *eloop_ctx, void *timeout_ctx)
273 {
274 struct wpa_supplicant *wpa_s = eloop_ctx;
275
276 wpa_dbg(wpa_s, MSG_DEBUG, "Starting delayed sched scan");
277
278 if (wpa_supplicant_req_sched_scan(wpa_s))
279 wpa_supplicant_req_scan(wpa_s, 0, 0);
280 }
281
282
283 static void
284 wpa_supplicant_sched_scan_timeout(void *eloop_ctx, void *timeout_ctx)
285 {
286 struct wpa_supplicant *wpa_s = eloop_ctx;
287
288 wpa_dbg(wpa_s, MSG_DEBUG, "Sched scan timeout - stopping it");
289
290 wpa_s->sched_scan_timed_out = 1;
291 wpa_supplicant_cancel_sched_scan(wpa_s);
292 }
293
294
295 static int
296 wpa_supplicant_start_sched_scan(struct wpa_supplicant *wpa_s,
297 struct wpa_driver_scan_params *params)
298 {
299 int ret;
300
301 wpa_supplicant_notify_scanning(wpa_s, 1);
302 ret = wpa_drv_sched_scan(wpa_s, params);
303 if (ret)
304 wpa_supplicant_notify_scanning(wpa_s, 0);
305 else
306 wpa_s->sched_scanning = 1;
307
308 return ret;
309 }
310
311
312 static int wpa_supplicant_stop_sched_scan(struct wpa_supplicant *wpa_s)
313 {
314 int ret;
315
316 ret = wpa_drv_stop_sched_scan(wpa_s);
317 if (ret) {
318 wpa_dbg(wpa_s, MSG_DEBUG, "stopping sched_scan failed!");
319 /* TODO: what to do if stopping fails? */
320 return -1;
321 }
322
323 return ret;
324 }
325
326
327 static struct wpa_driver_scan_filter *
328 wpa_supplicant_build_filter_ssids(struct wpa_config *conf, size_t *num_ssids)
329 {
330 struct wpa_driver_scan_filter *ssids;
331 struct wpa_ssid *ssid;
332 size_t count;
333
334 *num_ssids = 0;
335 if (!conf->filter_ssids)
336 return NULL;
337
338 for (count = 0, ssid = conf->ssid; ssid; ssid = ssid->next) {
339 if (ssid->ssid && ssid->ssid_len)
340 count++;
341 }
342 if (count == 0)
343 return NULL;
344 ssids = os_calloc(count, sizeof(struct wpa_driver_scan_filter));
345 if (ssids == NULL)
346 return NULL;
347
348 for (ssid = conf->ssid; ssid; ssid = ssid->next) {
349 if (!ssid->ssid || !ssid->ssid_len)
350 continue;
351 os_memcpy(ssids[*num_ssids].ssid, ssid->ssid, ssid->ssid_len);
352 ssids[*num_ssids].ssid_len = ssid->ssid_len;
353 (*num_ssids)++;
354 }
355
356 return ssids;
357 }
358
359
360 static void wpa_supplicant_optimize_freqs(
361 struct wpa_supplicant *wpa_s, struct wpa_driver_scan_params *params)
362 {
363 #ifdef CONFIG_P2P
364 if (params->freqs == NULL && wpa_s->p2p_in_provisioning &&
365 wpa_s->go_params) {
366 /* Optimize provisioning state scan based on GO information */
367 if (wpa_s->p2p_in_provisioning < 5 &&
368 wpa_s->go_params->freq > 0) {
369 wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only GO "
370 "preferred frequency %d MHz",
371 wpa_s->go_params->freq);
372 params->freqs = os_calloc(2, sizeof(int));
373 if (params->freqs)
374 params->freqs[0] = wpa_s->go_params->freq;
375 } else if (wpa_s->p2p_in_provisioning < 8 &&
376 wpa_s->go_params->freq_list[0]) {
377 wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only common "
378 "channels");
379 int_array_concat(&params->freqs,
380 wpa_s->go_params->freq_list);
381 if (params->freqs)
382 int_array_sort_unique(params->freqs);
383 }
384 wpa_s->p2p_in_provisioning++;
385 }
386
387 if (params->freqs == NULL && wpa_s->p2p_in_invitation) {
388 /*
389 * Optimize scan based on GO information during persistent
390 * group reinvocation
391 */
392 if (wpa_s->p2p_in_invitation < 5 &&
393 wpa_s->p2p_invite_go_freq > 0) {
394 wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only GO preferred frequency %d MHz during invitation",
395 wpa_s->p2p_invite_go_freq);
396 params->freqs = os_calloc(2, sizeof(int));
397 if (params->freqs)
398 params->freqs[0] = wpa_s->p2p_invite_go_freq;
399 }
400 wpa_s->p2p_in_invitation++;
401 if (wpa_s->p2p_in_invitation > 20) {
402 /*
403 * This should not really happen since the variable is
404 * cleared on group removal, but if it does happen, make
405 * sure we do not get stuck in special invitation scan
406 * mode.
407 */
408 wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Clear p2p_in_invitation");
409 wpa_s->p2p_in_invitation = 0;
410 }
411 }
412 #endif /* CONFIG_P2P */
413
414 #ifdef CONFIG_WPS
415 if (params->freqs == NULL && wpa_s->after_wps && wpa_s->wps_freq) {
416 /*
417 * Optimize post-provisioning scan based on channel used
418 * during provisioning.
419 */
420 wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Scan only frequency %u MHz "
421 "that was used during provisioning", wpa_s->wps_freq);
422 params->freqs = os_calloc(2, sizeof(int));
423 if (params->freqs)
424 params->freqs[0] = wpa_s->wps_freq;
425 wpa_s->after_wps--;
426 } else if (wpa_s->after_wps)
427 wpa_s->after_wps--;
428
429 if (params->freqs == NULL && wpa_s->known_wps_freq && wpa_s->wps_freq)
430 {
431 /* Optimize provisioning scan based on already known channel */
432 wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Scan only frequency %u MHz",
433 wpa_s->wps_freq);
434 params->freqs = os_calloc(2, sizeof(int));
435 if (params->freqs)
436 params->freqs[0] = wpa_s->wps_freq;
437 wpa_s->known_wps_freq = 0; /* only do this once */
438 }
439 #endif /* CONFIG_WPS */
440 }
441
442
443 #ifdef CONFIG_INTERWORKING
444 static void wpas_add_interworking_elements(struct wpa_supplicant *wpa_s,
445 struct wpabuf *buf)
446 {
447 wpabuf_put_u8(buf, WLAN_EID_INTERWORKING);
448 wpabuf_put_u8(buf, is_zero_ether_addr(wpa_s->conf->hessid) ? 1 :
449 1 + ETH_ALEN);
450 wpabuf_put_u8(buf, wpa_s->conf->access_network_type);
451 /* No Venue Info */
452 if (!is_zero_ether_addr(wpa_s->conf->hessid))
453 wpabuf_put_data(buf, wpa_s->conf->hessid, ETH_ALEN);
454 }
455 #endif /* CONFIG_INTERWORKING */
456
457
458 #ifdef CONFIG_MBO
459 static void wpas_fils_req_param_add_max_channel(struct wpa_supplicant *wpa_s,
460 struct wpabuf **ie)
461 {
462 if (wpabuf_resize(ie, 5)) {
463 wpa_printf(MSG_DEBUG,
464 "Failed to allocate space for FILS Request Parameters element");
465 return;
466 }
467
468 /* FILS Request Parameters element */
469 wpabuf_put_u8(*ie, WLAN_EID_EXTENSION);
470 wpabuf_put_u8(*ie, 3); /* FILS Request attribute length */
471 wpabuf_put_u8(*ie, WLAN_EID_EXT_FILS_REQ_PARAMS);
472 /* Parameter control bitmap */
473 wpabuf_put_u8(*ie, 0);
474 /* Max Channel Time field - contains the value of MaxChannelTime
475 * parameter of the MLME-SCAN.request primitive represented in units of
476 * TUs, as an unsigned integer. A Max Channel Time field value of 255
477 * is used to indicate any duration of more than 254 TUs, or an
478 * unspecified or unknown duration. (IEEE Std 802.11ai-2016, 9.4.2.178)
479 */
480 wpabuf_put_u8(*ie, 255);
481 }
482 #endif /* CONFIG_MBO */
483
484
485 void wpa_supplicant_set_default_scan_ies(struct wpa_supplicant *wpa_s)
486 {
487 struct wpabuf *default_ies = NULL;
488 u8 ext_capab[18];
489 int ext_capab_len;
490 enum wpa_driver_if_type type = WPA_IF_STATION;
491
492 #ifdef CONFIG_P2P
493 if (wpa_s->p2p_group_interface == P2P_GROUP_INTERFACE_CLIENT)
494 type = WPA_IF_P2P_CLIENT;
495 #endif /* CONFIG_P2P */
496
497 wpa_drv_get_ext_capa(wpa_s, type);
498
499 ext_capab_len = wpas_build_ext_capab(wpa_s, ext_capab,
500 sizeof(ext_capab));
501 if (ext_capab_len > 0 &&
502 wpabuf_resize(&default_ies, ext_capab_len) == 0)
503 wpabuf_put_data(default_ies, ext_capab, ext_capab_len);
504
505 #ifdef CONFIG_MBO
506 if (wpa_s->enable_oce & OCE_STA)
507 wpas_fils_req_param_add_max_channel(wpa_s, &default_ies);
508 /* Send MBO and OCE capabilities */
509 if (wpabuf_resize(&default_ies, 12) == 0)
510 wpas_mbo_scan_ie(wpa_s, default_ies);
511 #endif /* CONFIG_MBO */
512
513 if (default_ies)
514 wpa_drv_set_default_scan_ies(wpa_s, wpabuf_head(default_ies),
515 wpabuf_len(default_ies));
516 wpabuf_free(default_ies);
517 }
518
519
520 static struct wpabuf * wpa_supplicant_extra_ies(struct wpa_supplicant *wpa_s)
521 {
522 struct wpabuf *extra_ie = NULL;
523 u8 ext_capab[18];
524 int ext_capab_len;
525 #ifdef CONFIG_WPS
526 int wps = 0;
527 enum wps_request_type req_type = WPS_REQ_ENROLLEE_INFO;
528 #endif /* CONFIG_WPS */
529
530 #ifdef CONFIG_P2P
531 if (wpa_s->p2p_group_interface == P2P_GROUP_INTERFACE_CLIENT)
532 wpa_drv_get_ext_capa(wpa_s, WPA_IF_P2P_CLIENT);
533 else
534 #endif /* CONFIG_P2P */
535 wpa_drv_get_ext_capa(wpa_s, WPA_IF_STATION);
536
537 ext_capab_len = wpas_build_ext_capab(wpa_s, ext_capab,
538 sizeof(ext_capab));
539 if (ext_capab_len > 0 &&
540 wpabuf_resize(&extra_ie, ext_capab_len) == 0)
541 wpabuf_put_data(extra_ie, ext_capab, ext_capab_len);
542
543 #ifdef CONFIG_INTERWORKING
544 if (wpa_s->conf->interworking &&
545 wpabuf_resize(&extra_ie, 100) == 0)
546 wpas_add_interworking_elements(wpa_s, extra_ie);
547 #endif /* CONFIG_INTERWORKING */
548
549 #ifdef CONFIG_MBO
550 if (wpa_s->enable_oce & OCE_STA)
551 wpas_fils_req_param_add_max_channel(wpa_s, &extra_ie);
552 #endif /* CONFIG_MBO */
553
554 #ifdef CONFIG_WPS
555 wps = wpas_wps_in_use(wpa_s, &req_type);
556
557 if (wps) {
558 struct wpabuf *wps_ie;
559 wps_ie = wps_build_probe_req_ie(wps == 2 ? DEV_PW_PUSHBUTTON :
560 DEV_PW_DEFAULT,
561 &wpa_s->wps->dev,
562 wpa_s->wps->uuid, req_type,
563 0, NULL);
564 if (wps_ie) {
565 if (wpabuf_resize(&extra_ie, wpabuf_len(wps_ie)) == 0)
566 wpabuf_put_buf(extra_ie, wps_ie);
567 wpabuf_free(wps_ie);
568 }
569 }
570
571 #ifdef CONFIG_P2P
572 if (wps) {
573 size_t ielen = p2p_scan_ie_buf_len(wpa_s->global->p2p);
574 if (wpabuf_resize(&extra_ie, ielen) == 0)
575 wpas_p2p_scan_ie(wpa_s, extra_ie);
576 }
577 #endif /* CONFIG_P2P */
578
579 wpa_supplicant_mesh_add_scan_ie(wpa_s, &extra_ie);
580
581 #endif /* CONFIG_WPS */
582
583 #ifdef CONFIG_HS20
584 if (wpa_s->conf->hs20 && wpabuf_resize(&extra_ie, 9) == 0)
585 wpas_hs20_add_indication(extra_ie, -1, 0);
586 #endif /* CONFIG_HS20 */
587
588 #ifdef CONFIG_FST
589 if (wpa_s->fst_ies &&
590 wpabuf_resize(&extra_ie, wpabuf_len(wpa_s->fst_ies)) == 0)
591 wpabuf_put_buf(extra_ie, wpa_s->fst_ies);
592 #endif /* CONFIG_FST */
593
594 #ifdef CONFIG_MBO
595 /* Send MBO and OCE capabilities */
596 if (wpabuf_resize(&extra_ie, 12) == 0)
597 wpas_mbo_scan_ie(wpa_s, extra_ie);
598 #endif /* CONFIG_MBO */
599
600 if (wpa_s->vendor_elem[VENDOR_ELEM_PROBE_REQ]) {
601 struct wpabuf *buf = wpa_s->vendor_elem[VENDOR_ELEM_PROBE_REQ];
602
603 if (wpabuf_resize(&extra_ie, wpabuf_len(buf)) == 0)
604 wpabuf_put_buf(extra_ie, buf);
605 }
606
607 return extra_ie;
608 }
609
610
611 #ifdef CONFIG_P2P
612
613 /*
614 * Check whether there are any enabled networks or credentials that could be
615 * used for a non-P2P connection.
616 */
617 static int non_p2p_network_enabled(struct wpa_supplicant *wpa_s)
618 {
619 struct wpa_ssid *ssid;
620
621 for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
622 if (wpas_network_disabled(wpa_s, ssid))
623 continue;
624 if (!ssid->p2p_group)
625 return 1;
626 }
627
628 if (wpa_s->conf->cred && wpa_s->conf->interworking &&
629 wpa_s->conf->auto_interworking)
630 return 1;
631
632 return 0;
633 }
634
635 #endif /* CONFIG_P2P */
636
637
638 static void wpa_setband_scan_freqs_list(struct wpa_supplicant *wpa_s,
639 enum hostapd_hw_mode band,
640 struct wpa_driver_scan_params *params)
641 {
642 /* Include only supported channels for the specified band */
643 struct hostapd_hw_modes *mode;
644 int count, i;
645
646 mode = get_mode(wpa_s->hw.modes, wpa_s->hw.num_modes, band);
647 if (mode == NULL) {
648 /* No channels supported in this band - use empty list */
649 params->freqs = os_zalloc(sizeof(int));
650 return;
651 }
652
653 params->freqs = os_calloc(mode->num_channels + 1, sizeof(int));
654 if (params->freqs == NULL)
655 return;
656 for (count = 0, i = 0; i < mode->num_channels; i++) {
657 if (mode->channels[i].flag & HOSTAPD_CHAN_DISABLED)
658 continue;
659 params->freqs[count++] = mode->channels[i].freq;
660 }
661 }
662
663
664 static void wpa_setband_scan_freqs(struct wpa_supplicant *wpa_s,
665 struct wpa_driver_scan_params *params)
666 {
667 if (wpa_s->hw.modes == NULL)
668 return; /* unknown what channels the driver supports */
669 if (params->freqs)
670 return; /* already using a limited channel set */
671 if (wpa_s->setband == WPA_SETBAND_5G)
672 wpa_setband_scan_freqs_list(wpa_s, HOSTAPD_MODE_IEEE80211A,
673 params);
674 else if (wpa_s->setband == WPA_SETBAND_2G)
675 wpa_setband_scan_freqs_list(wpa_s, HOSTAPD_MODE_IEEE80211G,
676 params);
677 }
678
679
680 static void wpa_add_scan_ssid(struct wpa_supplicant *wpa_s,
681 struct wpa_driver_scan_params *params,
682 size_t max_ssids, const u8 *ssid, size_t ssid_len)
683 {
684 unsigned int j;
685
686 for (j = 0; j < params->num_ssids; j++) {
687 if (params->ssids[j].ssid_len == ssid_len &&
688 params->ssids[j].ssid &&
689 os_memcmp(params->ssids[j].ssid, ssid, ssid_len) == 0)
690 return; /* already in the list */
691 }
692
693 if (params->num_ssids + 1 > max_ssids) {
694 wpa_printf(MSG_DEBUG, "Over max scan SSIDs for manual request");
695 return;
696 }
697
698 wpa_printf(MSG_DEBUG, "Scan SSID (manual request): %s",
699 wpa_ssid_txt(ssid, ssid_len));
700
701 params->ssids[params->num_ssids].ssid = ssid;
702 params->ssids[params->num_ssids].ssid_len = ssid_len;
703 params->num_ssids++;
704 }
705
706
707 static void wpa_add_owe_scan_ssid(struct wpa_supplicant *wpa_s,
708 struct wpa_driver_scan_params *params,
709 struct wpa_ssid *ssid, size_t max_ssids)
710 {
711 #ifdef CONFIG_OWE
712 struct wpa_bss *bss;
713
714 if (!(ssid->key_mgmt & WPA_KEY_MGMT_OWE))
715 return;
716
717 wpa_printf(MSG_DEBUG, "OWE: Look for transition mode AP. ssid=%s",
718 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
719
720 dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list) {
721 const u8 *owe, *pos, *end;
722 const u8 *owe_ssid;
723 size_t owe_ssid_len;
724
725 if (bss->ssid_len != ssid->ssid_len ||
726 os_memcmp(bss->ssid, ssid->ssid, ssid->ssid_len) != 0)
727 continue;
728
729 owe = wpa_bss_get_vendor_ie(bss, OWE_IE_VENDOR_TYPE);
730 if (!owe || owe[1] < 4)
731 continue;
732
733 pos = owe + 6;
734 end = owe + 2 + owe[1];
735
736 /* Must include BSSID and ssid_len */
737 if (end - pos < ETH_ALEN + 1)
738 return;
739
740 /* Skip BSSID */
741 pos += ETH_ALEN;
742 owe_ssid_len = *pos++;
743 owe_ssid = pos;
744
745 if ((size_t) (end - pos) < owe_ssid_len ||
746 owe_ssid_len > SSID_MAX_LEN)
747 return;
748
749 wpa_printf(MSG_DEBUG,
750 "OWE: scan_ssids: transition mode OWE ssid=%s",
751 wpa_ssid_txt(owe_ssid, owe_ssid_len));
752
753 wpa_add_scan_ssid(wpa_s, params, max_ssids,
754 owe_ssid, owe_ssid_len);
755 return;
756 }
757 #endif /* CONFIG_OWE */
758 }
759
760
761 static void wpa_set_scan_ssids(struct wpa_supplicant *wpa_s,
762 struct wpa_driver_scan_params *params,
763 size_t max_ssids)
764 {
765 unsigned int i;
766 struct wpa_ssid *ssid;
767
768 /*
769 * For devices with max_ssids greater than 1, leave the last slot empty
770 * for adding the wildcard scan entry.
771 */
772 max_ssids = max_ssids > 1 ? max_ssids - 1 : max_ssids;
773
774 for (i = 0; i < wpa_s->scan_id_count; i++) {
775 ssid = wpa_config_get_network(wpa_s->conf, wpa_s->scan_id[i]);
776 if (!ssid)
777 continue;
778 if (ssid->scan_ssid)
779 wpa_add_scan_ssid(wpa_s, params, max_ssids,
780 ssid->ssid, ssid->ssid_len);
781 /*
782 * Also add the SSID of the OWE BSS, to allow discovery of
783 * transition mode APs more quickly.
784 */
785 wpa_add_owe_scan_ssid(wpa_s, params, ssid, max_ssids);
786 }
787
788 wpa_s->scan_id_count = 0;
789 }
790
791
792 static int wpa_set_ssids_from_scan_req(struct wpa_supplicant *wpa_s,
793 struct wpa_driver_scan_params *params,
794 size_t max_ssids)
795 {
796 unsigned int i;
797
798 if (wpa_s->ssids_from_scan_req == NULL ||
799 wpa_s->num_ssids_from_scan_req == 0)
800 return 0;
801
802 if (wpa_s->num_ssids_from_scan_req > max_ssids) {
803 wpa_s->num_ssids_from_scan_req = max_ssids;
804 wpa_printf(MSG_DEBUG, "Over max scan SSIDs from scan req: %u",
805 (unsigned int) max_ssids);
806 }
807
808 for (i = 0; i < wpa_s->num_ssids_from_scan_req; i++) {
809 params->ssids[i].ssid = wpa_s->ssids_from_scan_req[i].ssid;
810 params->ssids[i].ssid_len =
811 wpa_s->ssids_from_scan_req[i].ssid_len;
812 wpa_hexdump_ascii(MSG_DEBUG, "specific SSID",
813 params->ssids[i].ssid,
814 params->ssids[i].ssid_len);
815 }
816
817 params->num_ssids = wpa_s->num_ssids_from_scan_req;
818 wpa_s->num_ssids_from_scan_req = 0;
819 return 1;
820 }
821
822
823 static void wpa_supplicant_scan(void *eloop_ctx, void *timeout_ctx)
824 {
825 struct wpa_supplicant *wpa_s = eloop_ctx;
826 struct wpa_ssid *ssid;
827 int ret, p2p_in_prog;
828 struct wpabuf *extra_ie = NULL;
829 struct wpa_driver_scan_params params;
830 struct wpa_driver_scan_params *scan_params;
831 size_t max_ssids;
832 int connect_without_scan = 0;
833
834 wpa_s->ignore_post_flush_scan_res = 0;
835
836 if (wpa_s->wpa_state == WPA_INTERFACE_DISABLED) {
837 wpa_dbg(wpa_s, MSG_DEBUG, "Skip scan - interface disabled");
838 return;
839 }
840
841 if (wpa_s->disconnected && wpa_s->scan_req == NORMAL_SCAN_REQ) {
842 wpa_dbg(wpa_s, MSG_DEBUG, "Disconnected - do not scan");
843 wpa_supplicant_set_state(wpa_s, WPA_DISCONNECTED);
844 return;
845 }
846
847 if (wpa_s->scanning) {
848 /*
849 * If we are already in scanning state, we shall reschedule the
850 * the incoming scan request.
851 */
852 wpa_dbg(wpa_s, MSG_DEBUG, "Already scanning - Reschedule the incoming scan req");
853 wpa_supplicant_req_scan(wpa_s, 1, 0);
854 return;
855 }
856
857 if (!wpa_supplicant_enabled_networks(wpa_s) &&
858 wpa_s->scan_req == NORMAL_SCAN_REQ) {
859 wpa_dbg(wpa_s, MSG_DEBUG, "No enabled networks - do not scan");
860 wpa_supplicant_set_state(wpa_s, WPA_INACTIVE);
861 return;
862 }
863
864 if (wpa_s->conf->ap_scan != 0 &&
865 (wpa_s->drv_flags & WPA_DRIVER_FLAGS_WIRED)) {
866 wpa_dbg(wpa_s, MSG_DEBUG, "Using wired authentication - "
867 "overriding ap_scan configuration");
868 wpa_s->conf->ap_scan = 0;
869 wpas_notify_ap_scan_changed(wpa_s);
870 }
871
872 if (wpa_s->conf->ap_scan == 0) {
873 wpa_supplicant_gen_assoc_event(wpa_s);
874 return;
875 }
876
877 ssid = NULL;
878 if (wpa_s->scan_req != MANUAL_SCAN_REQ &&
879 wpa_s->connect_without_scan) {
880 connect_without_scan = 1;
881 for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
882 if (ssid == wpa_s->connect_without_scan)
883 break;
884 }
885 }
886
887 p2p_in_prog = wpas_p2p_in_progress(wpa_s);
888 if (p2p_in_prog && p2p_in_prog != 2 &&
889 (!ssid ||
890 (ssid->mode != WPAS_MODE_AP && ssid->mode != WPAS_MODE_P2P_GO))) {
891 wpa_dbg(wpa_s, MSG_DEBUG, "Delay station mode scan while P2P operation is in progress");
892 wpa_supplicant_req_scan(wpa_s, 5, 0);
893 return;
894 }
895
896 /*
897 * Don't cancel the scan based on ongoing PNO; defer it. Some scans are
898 * used for changing modes inside wpa_supplicant (roaming,
899 * auto-reconnect, etc). Discarding the scan might hurt these processes.
900 * The normal use case for PNO is to suspend the host immediately after
901 * starting PNO, so the periodic 100 ms attempts to run the scan do not
902 * normally happen in practice multiple times, i.e., this is simply
903 * restarting scanning once the host is woken up and PNO stopped.
904 */
905 if (wpa_s->pno || wpa_s->pno_sched_pending) {
906 wpa_dbg(wpa_s, MSG_DEBUG, "Defer scan - PNO is in progress");
907 wpa_supplicant_req_scan(wpa_s, 0, 100000);
908 return;
909 }
910
911 if (wpa_s->conf->ap_scan == 2)
912 max_ssids = 1;
913 else {
914 max_ssids = wpa_s->max_scan_ssids;
915 if (max_ssids > WPAS_MAX_SCAN_SSIDS)
916 max_ssids = WPAS_MAX_SCAN_SSIDS;
917 }
918
919 wpa_s->last_scan_req = wpa_s->scan_req;
920 wpa_s->scan_req = NORMAL_SCAN_REQ;
921
922 if (connect_without_scan) {
923 wpa_s->connect_without_scan = NULL;
924 if (ssid) {
925 wpa_printf(MSG_DEBUG, "Start a pre-selected network "
926 "without scan step");
927 wpa_supplicant_associate(wpa_s, NULL, ssid);
928 return;
929 }
930 }
931
932 os_memset(&params, 0, sizeof(params));
933
934 wpa_s->scan_prev_wpa_state = wpa_s->wpa_state;
935 if (wpa_s->wpa_state == WPA_DISCONNECTED ||
936 wpa_s->wpa_state == WPA_INACTIVE)
937 wpa_supplicant_set_state(wpa_s, WPA_SCANNING);
938
939 /*
940 * If autoscan has set its own scanning parameters
941 */
942 if (wpa_s->autoscan_params != NULL) {
943 scan_params = wpa_s->autoscan_params;
944 goto scan;
945 }
946
947 if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
948 wpa_set_ssids_from_scan_req(wpa_s, &params, max_ssids)) {
949 wpa_printf(MSG_DEBUG, "Use specific SSIDs from SCAN command");
950 goto ssid_list_set;
951 }
952
953 #ifdef CONFIG_P2P
954 if ((wpa_s->p2p_in_provisioning || wpa_s->show_group_started) &&
955 wpa_s->go_params && !wpa_s->conf->passive_scan) {
956 wpa_printf(MSG_DEBUG, "P2P: Use specific SSID for scan during P2P group formation (p2p_in_provisioning=%d show_group_started=%d)",
957 wpa_s->p2p_in_provisioning,
958 wpa_s->show_group_started);
959 params.ssids[0].ssid = wpa_s->go_params->ssid;
960 params.ssids[0].ssid_len = wpa_s->go_params->ssid_len;
961 params.num_ssids = 1;
962 goto ssid_list_set;
963 }
964
965 if (wpa_s->p2p_in_invitation) {
966 if (wpa_s->current_ssid) {
967 wpa_printf(MSG_DEBUG, "P2P: Use specific SSID for scan during invitation");
968 params.ssids[0].ssid = wpa_s->current_ssid->ssid;
969 params.ssids[0].ssid_len =
970 wpa_s->current_ssid->ssid_len;
971 params.num_ssids = 1;
972 } else {
973 wpa_printf(MSG_DEBUG, "P2P: No specific SSID known for scan during invitation");
974 }
975 goto ssid_list_set;
976 }
977 #endif /* CONFIG_P2P */
978
979 /* Find the starting point from which to continue scanning */
980 ssid = wpa_s->conf->ssid;
981 if (wpa_s->prev_scan_ssid != WILDCARD_SSID_SCAN) {
982 while (ssid) {
983 if (ssid == wpa_s->prev_scan_ssid) {
984 ssid = ssid->next;
985 break;
986 }
987 ssid = ssid->next;
988 }
989 }
990
991 if (wpa_s->last_scan_req != MANUAL_SCAN_REQ &&
992 #ifdef CONFIG_AP
993 !wpa_s->ap_iface &&
994 #endif /* CONFIG_AP */
995 wpa_s->conf->ap_scan == 2) {
996 wpa_s->connect_without_scan = NULL;
997 wpa_s->prev_scan_wildcard = 0;
998 wpa_supplicant_assoc_try(wpa_s, ssid);
999 return;
1000 } else if (wpa_s->conf->ap_scan == 2) {
1001 /*
1002 * User-initiated scan request in ap_scan == 2; scan with
1003 * wildcard SSID.
1004 */
1005 ssid = NULL;
1006 } else if (wpa_s->reattach && wpa_s->current_ssid != NULL) {
1007 /*
1008 * Perform single-channel single-SSID scan for
1009 * reassociate-to-same-BSS operation.
1010 */
1011 /* Setup SSID */
1012 ssid = wpa_s->current_ssid;
1013 wpa_hexdump_ascii(MSG_DEBUG, "Scan SSID",
1014 ssid->ssid, ssid->ssid_len);
1015 params.ssids[0].ssid = ssid->ssid;
1016 params.ssids[0].ssid_len = ssid->ssid_len;
1017 params.num_ssids = 1;
1018
1019 /*
1020 * Allocate memory for frequency array, allocate one extra
1021 * slot for the zero-terminator.
1022 */
1023 params.freqs = os_malloc(sizeof(int) * 2);
1024 if (params.freqs) {
1025 params.freqs[0] = wpa_s->assoc_freq;
1026 params.freqs[1] = 0;
1027 }
1028
1029 /*
1030 * Reset the reattach flag so that we fall back to full scan if
1031 * this scan fails.
1032 */
1033 wpa_s->reattach = 0;
1034 } else {
1035 struct wpa_ssid *start = ssid, *tssid;
1036 int freqs_set = 0;
1037 if (ssid == NULL && max_ssids > 1)
1038 ssid = wpa_s->conf->ssid;
1039 while (ssid) {
1040 if (!wpas_network_disabled(wpa_s, ssid) &&
1041 ssid->scan_ssid) {
1042 wpa_hexdump_ascii(MSG_DEBUG, "Scan SSID",
1043 ssid->ssid, ssid->ssid_len);
1044 params.ssids[params.num_ssids].ssid =
1045 ssid->ssid;
1046 params.ssids[params.num_ssids].ssid_len =
1047 ssid->ssid_len;
1048 params.num_ssids++;
1049 if (params.num_ssids + 1 >= max_ssids)
1050 break;
1051 }
1052
1053 if (!wpas_network_disabled(wpa_s, ssid)) {
1054 /*
1055 * Also add the SSID of the OWE BSS, to allow
1056 * discovery of transition mode APs more
1057 * quickly.
1058 */
1059 wpa_add_owe_scan_ssid(wpa_s, &params, ssid,
1060 max_ssids);
1061 }
1062
1063 ssid = ssid->next;
1064 if (ssid == start)
1065 break;
1066 if (ssid == NULL && max_ssids > 1 &&
1067 start != wpa_s->conf->ssid)
1068 ssid = wpa_s->conf->ssid;
1069 }
1070
1071 if (wpa_s->scan_id_count &&
1072 wpa_s->last_scan_req == MANUAL_SCAN_REQ)
1073 wpa_set_scan_ssids(wpa_s, &params, max_ssids);
1074
1075 for (tssid = wpa_s->conf->ssid;
1076 wpa_s->last_scan_req != MANUAL_SCAN_REQ && tssid;
1077 tssid = tssid->next) {
1078 if (wpas_network_disabled(wpa_s, tssid))
1079 continue;
1080 if ((params.freqs || !freqs_set) && tssid->scan_freq) {
1081 int_array_concat(&params.freqs,
1082 tssid->scan_freq);
1083 } else {
1084 os_free(params.freqs);
1085 params.freqs = NULL;
1086 }
1087 freqs_set = 1;
1088 }
1089 int_array_sort_unique(params.freqs);
1090 }
1091
1092 if (ssid && max_ssids == 1) {
1093 /*
1094 * If the driver is limited to 1 SSID at a time interleave
1095 * wildcard SSID scans with specific SSID scans to avoid
1096 * waiting a long time for a wildcard scan.
1097 */
1098 if (!wpa_s->prev_scan_wildcard) {
1099 params.ssids[0].ssid = NULL;
1100 params.ssids[0].ssid_len = 0;
1101 wpa_s->prev_scan_wildcard = 1;
1102 wpa_dbg(wpa_s, MSG_DEBUG, "Starting AP scan for "
1103 "wildcard SSID (Interleave with specific)");
1104 } else {
1105 wpa_s->prev_scan_ssid = ssid;
1106 wpa_s->prev_scan_wildcard = 0;
1107 wpa_dbg(wpa_s, MSG_DEBUG,
1108 "Starting AP scan for specific SSID: %s",
1109 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
1110 }
1111 } else if (ssid) {
1112 /* max_ssids > 1 */
1113
1114 wpa_s->prev_scan_ssid = ssid;
1115 wpa_dbg(wpa_s, MSG_DEBUG, "Include wildcard SSID in "
1116 "the scan request");
1117 params.num_ssids++;
1118 } else if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
1119 wpa_s->manual_scan_passive && params.num_ssids == 0) {
1120 wpa_dbg(wpa_s, MSG_DEBUG, "Use passive scan based on manual request");
1121 } else if (wpa_s->conf->passive_scan) {
1122 wpa_dbg(wpa_s, MSG_DEBUG,
1123 "Use passive scan based on configuration");
1124 } else {
1125 wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
1126 params.num_ssids++;
1127 wpa_dbg(wpa_s, MSG_DEBUG, "Starting AP scan for wildcard "
1128 "SSID");
1129 }
1130
1131 ssid_list_set:
1132 wpa_supplicant_optimize_freqs(wpa_s, &params);
1133 extra_ie = wpa_supplicant_extra_ies(wpa_s);
1134
1135 if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
1136 wpa_s->manual_scan_only_new) {
1137 wpa_printf(MSG_DEBUG,
1138 "Request driver to clear scan cache due to manual only_new=1 scan");
1139 params.only_new_results = 1;
1140 }
1141
1142 if (wpa_s->last_scan_req == MANUAL_SCAN_REQ && params.freqs == NULL &&
1143 wpa_s->manual_scan_freqs) {
1144 wpa_dbg(wpa_s, MSG_DEBUG, "Limit manual scan to specified channels");
1145 params.freqs = wpa_s->manual_scan_freqs;
1146 wpa_s->manual_scan_freqs = NULL;
1147 }
1148
1149 if (params.freqs == NULL && wpa_s->select_network_scan_freqs) {
1150 wpa_dbg(wpa_s, MSG_DEBUG,
1151 "Limit select_network scan to specified channels");
1152 params.freqs = wpa_s->select_network_scan_freqs;
1153 wpa_s->select_network_scan_freqs = NULL;
1154 }
1155
1156 if (params.freqs == NULL && wpa_s->next_scan_freqs) {
1157 wpa_dbg(wpa_s, MSG_DEBUG, "Optimize scan based on previously "
1158 "generated frequency list");
1159 params.freqs = wpa_s->next_scan_freqs;
1160 } else
1161 os_free(wpa_s->next_scan_freqs);
1162 wpa_s->next_scan_freqs = NULL;
1163 wpa_setband_scan_freqs(wpa_s, &params);
1164
1165 /* See if user specified frequencies. If so, scan only those. */
1166 if (wpa_s->conf->freq_list && !params.freqs) {
1167 wpa_dbg(wpa_s, MSG_DEBUG,
1168 "Optimize scan based on conf->freq_list");
1169 int_array_concat(&params.freqs, wpa_s->conf->freq_list);
1170 }
1171
1172 /* Use current associated channel? */
1173 if (wpa_s->conf->scan_cur_freq && !params.freqs) {
1174 unsigned int num = wpa_s->num_multichan_concurrent;
1175
1176 params.freqs = os_calloc(num + 1, sizeof(int));
1177 if (params.freqs) {
1178 num = get_shared_radio_freqs(wpa_s, params.freqs, num);
1179 if (num > 0) {
1180 wpa_dbg(wpa_s, MSG_DEBUG, "Scan only the "
1181 "current operating channels since "
1182 "scan_cur_freq is enabled");
1183 } else {
1184 os_free(params.freqs);
1185 params.freqs = NULL;
1186 }
1187 }
1188 }
1189
1190 #ifdef CONFIG_MBO
1191 if (wpa_s->enable_oce & OCE_STA)
1192 params.oce_scan = 1;
1193 #endif /* CONFIG_MBO */
1194
1195 params.filter_ssids = wpa_supplicant_build_filter_ssids(
1196 wpa_s->conf, &params.num_filter_ssids);
1197 if (extra_ie) {
1198 params.extra_ies = wpabuf_head(extra_ie);
1199 params.extra_ies_len = wpabuf_len(extra_ie);
1200 }
1201
1202 #ifdef CONFIG_P2P
1203 if (wpa_s->p2p_in_provisioning || wpa_s->p2p_in_invitation ||
1204 (wpa_s->show_group_started && wpa_s->go_params)) {
1205 /*
1206 * The interface may not yet be in P2P mode, so we have to
1207 * explicitly request P2P probe to disable CCK rates.
1208 */
1209 params.p2p_probe = 1;
1210 }
1211 #endif /* CONFIG_P2P */
1212
1213 if ((wpa_s->mac_addr_rand_enable & MAC_ADDR_RAND_SCAN) &&
1214 wpa_s->wpa_state <= WPA_SCANNING) {
1215 params.mac_addr_rand = 1;
1216 if (wpa_s->mac_addr_scan) {
1217 params.mac_addr = wpa_s->mac_addr_scan;
1218 params.mac_addr_mask = wpa_s->mac_addr_scan + ETH_ALEN;
1219 }
1220 }
1221
1222 if (!is_zero_ether_addr(wpa_s->next_scan_bssid)) {
1223 struct wpa_bss *bss;
1224
1225 params.bssid = wpa_s->next_scan_bssid;
1226 bss = wpa_bss_get_bssid_latest(wpa_s, params.bssid);
1227 if (bss && bss->ssid_len && params.num_ssids == 1 &&
1228 params.ssids[0].ssid_len == 0) {
1229 params.ssids[0].ssid = bss->ssid;
1230 params.ssids[0].ssid_len = bss->ssid_len;
1231 wpa_dbg(wpa_s, MSG_DEBUG,
1232 "Scan a previously specified BSSID " MACSTR
1233 " and SSID %s",
1234 MAC2STR(params.bssid),
1235 wpa_ssid_txt(bss->ssid, bss->ssid_len));
1236 } else {
1237 wpa_dbg(wpa_s, MSG_DEBUG,
1238 "Scan a previously specified BSSID " MACSTR,
1239 MAC2STR(params.bssid));
1240 }
1241 }
1242
1243 scan_params = &params;
1244
1245 scan:
1246 #ifdef CONFIG_P2P
1247 /*
1248 * If the driver does not support multi-channel concurrency and a
1249 * virtual interface that shares the same radio with the wpa_s interface
1250 * is operating there may not be need to scan other channels apart from
1251 * the current operating channel on the other virtual interface. Filter
1252 * out other channels in case we are trying to find a connection for a
1253 * station interface when we are not configured to prefer station
1254 * connection and a concurrent operation is already in process.
1255 */
1256 if (wpa_s->scan_for_connection &&
1257 wpa_s->last_scan_req == NORMAL_SCAN_REQ &&
1258 !scan_params->freqs && !params.freqs &&
1259 wpas_is_p2p_prioritized(wpa_s) &&
1260 wpa_s->p2p_group_interface == NOT_P2P_GROUP_INTERFACE &&
1261 non_p2p_network_enabled(wpa_s)) {
1262 unsigned int num = wpa_s->num_multichan_concurrent;
1263
1264 params.freqs = os_calloc(num + 1, sizeof(int));
1265 if (params.freqs) {
1266 num = get_shared_radio_freqs(wpa_s, params.freqs, num);
1267 if (num > 0 && num == wpa_s->num_multichan_concurrent) {
1268 wpa_dbg(wpa_s, MSG_DEBUG, "Scan only the current operating channels since all channels are already used");
1269 } else {
1270 os_free(params.freqs);
1271 params.freqs = NULL;
1272 }
1273 }
1274 }
1275 #endif /* CONFIG_P2P */
1276
1277 ret = wpa_supplicant_trigger_scan(wpa_s, scan_params);
1278
1279 if (ret && wpa_s->last_scan_req == MANUAL_SCAN_REQ && params.freqs &&
1280 !wpa_s->manual_scan_freqs) {
1281 /* Restore manual_scan_freqs for the next attempt */
1282 wpa_s->manual_scan_freqs = params.freqs;
1283 params.freqs = NULL;
1284 }
1285
1286 wpabuf_free(extra_ie);
1287 os_free(params.freqs);
1288 os_free(params.filter_ssids);
1289
1290 if (ret) {
1291 wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate AP scan");
1292 if (wpa_s->scan_prev_wpa_state != wpa_s->wpa_state)
1293 wpa_supplicant_set_state(wpa_s,
1294 wpa_s->scan_prev_wpa_state);
1295 /* Restore scan_req since we will try to scan again */
1296 wpa_s->scan_req = wpa_s->last_scan_req;
1297 wpa_supplicant_req_scan(wpa_s, 1, 0);
1298 } else {
1299 wpa_s->scan_for_connection = 0;
1300 #ifdef CONFIG_INTERWORKING
1301 wpa_s->interworking_fast_assoc_tried = 0;
1302 #endif /* CONFIG_INTERWORKING */
1303 if (params.bssid)
1304 os_memset(wpa_s->next_scan_bssid, 0, ETH_ALEN);
1305 }
1306 }
1307
1308
1309 void wpa_supplicant_update_scan_int(struct wpa_supplicant *wpa_s, int sec)
1310 {
1311 struct os_reltime remaining, new_int;
1312 int cancelled;
1313
1314 cancelled = eloop_cancel_timeout_one(wpa_supplicant_scan, wpa_s, NULL,
1315 &remaining);
1316
1317 new_int.sec = sec;
1318 new_int.usec = 0;
1319 if (cancelled && os_reltime_before(&remaining, &new_int)) {
1320 new_int.sec = remaining.sec;
1321 new_int.usec = remaining.usec;
1322 }
1323
1324 if (cancelled) {
1325 eloop_register_timeout(new_int.sec, new_int.usec,
1326 wpa_supplicant_scan, wpa_s, NULL);
1327 }
1328 wpa_s->scan_interval = sec;
1329 }
1330
1331
1332 /**
1333 * wpa_supplicant_req_scan - Schedule a scan for neighboring access points
1334 * @wpa_s: Pointer to wpa_supplicant data
1335 * @sec: Number of seconds after which to scan
1336 * @usec: Number of microseconds after which to scan
1337 *
1338 * This function is used to schedule a scan for neighboring access points after
1339 * the specified time.
1340 */
1341 void wpa_supplicant_req_scan(struct wpa_supplicant *wpa_s, int sec, int usec)
1342 {
1343 int res;
1344
1345 if (wpa_s->p2p_mgmt) {
1346 wpa_dbg(wpa_s, MSG_DEBUG,
1347 "Ignore scan request (%d.%06d sec) on p2p_mgmt interface",
1348 sec, usec);
1349 return;
1350 }
1351
1352 res = eloop_deplete_timeout(sec, usec, wpa_supplicant_scan, wpa_s,
1353 NULL);
1354 if (res == 1) {
1355 wpa_dbg(wpa_s, MSG_DEBUG, "Rescheduling scan request: %d.%06d sec",
1356 sec, usec);
1357 } else if (res == 0) {
1358 wpa_dbg(wpa_s, MSG_DEBUG, "Ignore new scan request for %d.%06d sec since an earlier request is scheduled to trigger sooner",
1359 sec, usec);
1360 } else {
1361 wpa_dbg(wpa_s, MSG_DEBUG, "Setting scan request: %d.%06d sec",
1362 sec, usec);
1363 eloop_register_timeout(sec, usec, wpa_supplicant_scan, wpa_s, NULL);
1364 }
1365 }
1366
1367
1368 /**
1369 * wpa_supplicant_delayed_sched_scan - Request a delayed scheduled scan
1370 * @wpa_s: Pointer to wpa_supplicant data
1371 * @sec: Number of seconds after which to scan
1372 * @usec: Number of microseconds after which to scan
1373 * Returns: 0 on success or -1 otherwise
1374 *
1375 * This function is used to schedule periodic scans for neighboring
1376 * access points after the specified time.
1377 */
1378 int wpa_supplicant_delayed_sched_scan(struct wpa_supplicant *wpa_s,
1379 int sec, int usec)
1380 {
1381 if (!wpa_s->sched_scan_supported)
1382 return -1;
1383
1384 eloop_register_timeout(sec, usec,
1385 wpa_supplicant_delayed_sched_scan_timeout,
1386 wpa_s, NULL);
1387
1388 return 0;
1389 }
1390
1391
1392 static void
1393 wpa_scan_set_relative_rssi_params(struct wpa_supplicant *wpa_s,
1394 struct wpa_driver_scan_params *params)
1395 {
1396 if (wpa_s->wpa_state != WPA_COMPLETED ||
1397 !(wpa_s->drv_flags & WPA_DRIVER_FLAGS_SCHED_SCAN_RELATIVE_RSSI) ||
1398 wpa_s->srp.relative_rssi_set == 0)
1399 return;
1400
1401 params->relative_rssi_set = 1;
1402 params->relative_rssi = wpa_s->srp.relative_rssi;
1403
1404 if (wpa_s->srp.relative_adjust_rssi == 0)
1405 return;
1406
1407 params->relative_adjust_band = wpa_s->srp.relative_adjust_band;
1408 params->relative_adjust_rssi = wpa_s->srp.relative_adjust_rssi;
1409 }
1410
1411
1412 /**
1413 * wpa_supplicant_req_sched_scan - Start a periodic scheduled scan
1414 * @wpa_s: Pointer to wpa_supplicant data
1415 * Returns: 0 is sched_scan was started or -1 otherwise
1416 *
1417 * This function is used to schedule periodic scans for neighboring
1418 * access points repeating the scan continuously.
1419 */
1420 int wpa_supplicant_req_sched_scan(struct wpa_supplicant *wpa_s)
1421 {
1422 struct wpa_driver_scan_params params;
1423 struct wpa_driver_scan_params *scan_params;
1424 enum wpa_states prev_state;
1425 struct wpa_ssid *ssid = NULL;
1426 struct wpabuf *extra_ie = NULL;
1427 int ret;
1428 unsigned int max_sched_scan_ssids;
1429 int wildcard = 0;
1430 int need_ssids;
1431 struct sched_scan_plan scan_plan;
1432
1433 if (!wpa_s->sched_scan_supported)
1434 return -1;
1435
1436 if (wpa_s->max_sched_scan_ssids > WPAS_MAX_SCAN_SSIDS)
1437 max_sched_scan_ssids = WPAS_MAX_SCAN_SSIDS;
1438 else
1439 max_sched_scan_ssids = wpa_s->max_sched_scan_ssids;
1440 if (max_sched_scan_ssids < 1 || wpa_s->conf->disable_scan_offload)
1441 return -1;
1442
1443 wpa_s->sched_scan_stop_req = 0;
1444
1445 if (wpa_s->sched_scanning) {
1446 wpa_dbg(wpa_s, MSG_DEBUG, "Already sched scanning");
1447 return 0;
1448 }
1449
1450 need_ssids = 0;
1451 for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
1452 if (!wpas_network_disabled(wpa_s, ssid) && !ssid->scan_ssid) {
1453 /* Use wildcard SSID to find this network */
1454 wildcard = 1;
1455 } else if (!wpas_network_disabled(wpa_s, ssid) &&
1456 ssid->ssid_len)
1457 need_ssids++;
1458
1459 #ifdef CONFIG_WPS
1460 if (!wpas_network_disabled(wpa_s, ssid) &&
1461 ssid->key_mgmt == WPA_KEY_MGMT_WPS) {
1462 /*
1463 * Normal scan is more reliable and faster for WPS
1464 * operations and since these are for short periods of
1465 * time, the benefit of trying to use sched_scan would
1466 * be limited.
1467 */
1468 wpa_dbg(wpa_s, MSG_DEBUG, "Use normal scan instead of "
1469 "sched_scan for WPS");
1470 return -1;
1471 }
1472 #endif /* CONFIG_WPS */
1473 }
1474 if (wildcard)
1475 need_ssids++;
1476
1477 if (wpa_s->normal_scans < 3 &&
1478 (need_ssids <= wpa_s->max_scan_ssids ||
1479 wpa_s->max_scan_ssids >= (int) max_sched_scan_ssids)) {
1480 /*
1481 * When normal scan can speed up operations, use that for the
1482 * first operations before starting the sched_scan to allow
1483 * user space sleep more. We do this only if the normal scan
1484 * has functionality that is suitable for this or if the
1485 * sched_scan does not have better support for multiple SSIDs.
1486 */
1487 wpa_dbg(wpa_s, MSG_DEBUG, "Use normal scan instead of "
1488 "sched_scan for initial scans (normal_scans=%d)",
1489 wpa_s->normal_scans);
1490 return -1;
1491 }
1492
1493 os_memset(&params, 0, sizeof(params));
1494
1495 /* If we can't allocate space for the filters, we just don't filter */
1496 params.filter_ssids = os_calloc(wpa_s->max_match_sets,
1497 sizeof(struct wpa_driver_scan_filter));
1498
1499 prev_state = wpa_s->wpa_state;
1500 if (wpa_s->wpa_state == WPA_DISCONNECTED ||
1501 wpa_s->wpa_state == WPA_INACTIVE)
1502 wpa_supplicant_set_state(wpa_s, WPA_SCANNING);
1503
1504 if (wpa_s->autoscan_params != NULL) {
1505 scan_params = wpa_s->autoscan_params;
1506 goto scan;
1507 }
1508
1509 /* Find the starting point from which to continue scanning */
1510 ssid = wpa_s->conf->ssid;
1511 if (wpa_s->prev_sched_ssid) {
1512 while (ssid) {
1513 if (ssid == wpa_s->prev_sched_ssid) {
1514 ssid = ssid->next;
1515 break;
1516 }
1517 ssid = ssid->next;
1518 }
1519 }
1520
1521 if (!ssid || !wpa_s->prev_sched_ssid) {
1522 wpa_dbg(wpa_s, MSG_DEBUG, "Beginning of SSID list");
1523 wpa_s->sched_scan_timeout = max_sched_scan_ssids * 2;
1524 wpa_s->first_sched_scan = 1;
1525 ssid = wpa_s->conf->ssid;
1526 wpa_s->prev_sched_ssid = ssid;
1527 }
1528
1529 if (wildcard) {
1530 wpa_dbg(wpa_s, MSG_DEBUG, "Add wildcard SSID to sched_scan");
1531 params.num_ssids++;
1532 }
1533
1534 while (ssid) {
1535 if (wpas_network_disabled(wpa_s, ssid))
1536 goto next;
1537
1538 if (params.num_filter_ssids < wpa_s->max_match_sets &&
1539 params.filter_ssids && ssid->ssid && ssid->ssid_len) {
1540 wpa_dbg(wpa_s, MSG_DEBUG, "add to filter ssid: %s",
1541 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
1542 os_memcpy(params.filter_ssids[params.num_filter_ssids].ssid,
1543 ssid->ssid, ssid->ssid_len);
1544 params.filter_ssids[params.num_filter_ssids].ssid_len =
1545 ssid->ssid_len;
1546 params.num_filter_ssids++;
1547 } else if (params.filter_ssids && ssid->ssid && ssid->ssid_len)
1548 {
1549 wpa_dbg(wpa_s, MSG_DEBUG, "Not enough room for SSID "
1550 "filter for sched_scan - drop filter");
1551 os_free(params.filter_ssids);
1552 params.filter_ssids = NULL;
1553 params.num_filter_ssids = 0;
1554 }
1555
1556 if (ssid->scan_ssid && ssid->ssid && ssid->ssid_len) {
1557 if (params.num_ssids == max_sched_scan_ssids)
1558 break; /* only room for broadcast SSID */
1559 wpa_dbg(wpa_s, MSG_DEBUG,
1560 "add to active scan ssid: %s",
1561 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
1562 params.ssids[params.num_ssids].ssid =
1563 ssid->ssid;
1564 params.ssids[params.num_ssids].ssid_len =
1565 ssid->ssid_len;
1566 params.num_ssids++;
1567 if (params.num_ssids >= max_sched_scan_ssids) {
1568 wpa_s->prev_sched_ssid = ssid;
1569 do {
1570 ssid = ssid->next;
1571 } while (ssid &&
1572 (wpas_network_disabled(wpa_s, ssid) ||
1573 !ssid->scan_ssid));
1574 break;
1575 }
1576 }
1577
1578 next:
1579 wpa_s->prev_sched_ssid = ssid;
1580 ssid = ssid->next;
1581 }
1582
1583 if (params.num_filter_ssids == 0) {
1584 os_free(params.filter_ssids);
1585 params.filter_ssids = NULL;
1586 }
1587
1588 extra_ie = wpa_supplicant_extra_ies(wpa_s);
1589 if (extra_ie) {
1590 params.extra_ies = wpabuf_head(extra_ie);
1591 params.extra_ies_len = wpabuf_len(extra_ie);
1592 }
1593
1594 if (wpa_s->conf->filter_rssi)
1595 params.filter_rssi = wpa_s->conf->filter_rssi;
1596
1597 /* See if user specified frequencies. If so, scan only those. */
1598 if (wpa_s->conf->freq_list && !params.freqs) {
1599 wpa_dbg(wpa_s, MSG_DEBUG,
1600 "Optimize scan based on conf->freq_list");
1601 int_array_concat(&params.freqs, wpa_s->conf->freq_list);
1602 }
1603
1604 #ifdef CONFIG_MBO
1605 if (wpa_s->enable_oce & OCE_STA)
1606 params.oce_scan = 1;
1607 #endif /* CONFIG_MBO */
1608
1609 scan_params = &params;
1610
1611 scan:
1612 wpa_s->sched_scan_timed_out = 0;
1613
1614 /*
1615 * We cannot support multiple scan plans if the scan request includes
1616 * too many SSID's, so in this case use only the last scan plan and make
1617 * it run infinitely. It will be stopped by the timeout.
1618 */
1619 if (wpa_s->sched_scan_plans_num == 1 ||
1620 (wpa_s->sched_scan_plans_num && !ssid && wpa_s->first_sched_scan)) {
1621 params.sched_scan_plans = wpa_s->sched_scan_plans;
1622 params.sched_scan_plans_num = wpa_s->sched_scan_plans_num;
1623 } else if (wpa_s->sched_scan_plans_num > 1) {
1624 wpa_dbg(wpa_s, MSG_DEBUG,
1625 "Too many SSIDs. Default to using single scheduled_scan plan");
1626 params.sched_scan_plans =
1627 &wpa_s->sched_scan_plans[wpa_s->sched_scan_plans_num -
1628 1];
1629 params.sched_scan_plans_num = 1;
1630 } else {
1631 if (wpa_s->conf->sched_scan_interval)
1632 scan_plan.interval = wpa_s->conf->sched_scan_interval;
1633 else
1634 scan_plan.interval = 10;
1635
1636 if (scan_plan.interval > wpa_s->max_sched_scan_plan_interval) {
1637 wpa_printf(MSG_WARNING,
1638 "Scan interval too long(%u), use the maximum allowed(%u)",
1639 scan_plan.interval,
1640 wpa_s->max_sched_scan_plan_interval);
1641 scan_plan.interval =
1642 wpa_s->max_sched_scan_plan_interval;
1643 }
1644
1645 scan_plan.iterations = 0;
1646 params.sched_scan_plans = &scan_plan;
1647 params.sched_scan_plans_num = 1;
1648 }
1649
1650 params.sched_scan_start_delay = wpa_s->conf->sched_scan_start_delay;
1651
1652 if (ssid || !wpa_s->first_sched_scan) {
1653 wpa_dbg(wpa_s, MSG_DEBUG,
1654 "Starting sched scan after %u seconds: interval %u timeout %d",
1655 params.sched_scan_start_delay,
1656 params.sched_scan_plans[0].interval,
1657 wpa_s->sched_scan_timeout);
1658 } else {
1659 wpa_dbg(wpa_s, MSG_DEBUG,
1660 "Starting sched scan after %u seconds (no timeout)",
1661 params.sched_scan_start_delay);
1662 }
1663
1664 wpa_setband_scan_freqs(wpa_s, scan_params);
1665
1666 if ((wpa_s->mac_addr_rand_enable & MAC_ADDR_RAND_SCHED_SCAN) &&
1667 wpa_s->wpa_state <= WPA_SCANNING) {
1668 params.mac_addr_rand = 1;
1669 if (wpa_s->mac_addr_sched_scan) {
1670 params.mac_addr = wpa_s->mac_addr_sched_scan;
1671 params.mac_addr_mask = wpa_s->mac_addr_sched_scan +
1672 ETH_ALEN;
1673 }
1674 }
1675
1676 wpa_scan_set_relative_rssi_params(wpa_s, scan_params);
1677
1678 ret = wpa_supplicant_start_sched_scan(wpa_s, scan_params);
1679 wpabuf_free(extra_ie);
1680 os_free(params.filter_ssids);
1681 if (ret) {
1682 wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate sched scan");
1683 if (prev_state != wpa_s->wpa_state)
1684 wpa_supplicant_set_state(wpa_s, prev_state);
1685 return ret;
1686 }
1687
1688 /* If we have more SSIDs to scan, add a timeout so we scan them too */
1689 if (ssid || !wpa_s->first_sched_scan) {
1690 wpa_s->sched_scan_timed_out = 0;
1691 eloop_register_timeout(wpa_s->sched_scan_timeout, 0,
1692 wpa_supplicant_sched_scan_timeout,
1693 wpa_s, NULL);
1694 wpa_s->first_sched_scan = 0;
1695 wpa_s->sched_scan_timeout /= 2;
1696 params.sched_scan_plans[0].interval *= 2;
1697 if ((unsigned int) wpa_s->sched_scan_timeout <
1698 params.sched_scan_plans[0].interval ||
1699 params.sched_scan_plans[0].interval >
1700 wpa_s->max_sched_scan_plan_interval) {
1701 params.sched_scan_plans[0].interval = 10;
1702 wpa_s->sched_scan_timeout = max_sched_scan_ssids * 2;
1703 }
1704 }
1705
1706 /* If there is no more ssids, start next time from the beginning */
1707 if (!ssid)
1708 wpa_s->prev_sched_ssid = NULL;
1709
1710 return 0;
1711 }
1712
1713
1714 /**
1715 * wpa_supplicant_cancel_scan - Cancel a scheduled scan request
1716 * @wpa_s: Pointer to wpa_supplicant data
1717 *
1718 * This function is used to cancel a scan request scheduled with
1719 * wpa_supplicant_req_scan().
1720 */
1721 void wpa_supplicant_cancel_scan(struct wpa_supplicant *wpa_s)
1722 {
1723 wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling scan request");
1724 eloop_cancel_timeout(wpa_supplicant_scan, wpa_s, NULL);
1725 }
1726
1727
1728 /**
1729 * wpa_supplicant_cancel_delayed_sched_scan - Stop a delayed scheduled scan
1730 * @wpa_s: Pointer to wpa_supplicant data
1731 *
1732 * This function is used to stop a delayed scheduled scan.
1733 */
1734 void wpa_supplicant_cancel_delayed_sched_scan(struct wpa_supplicant *wpa_s)
1735 {
1736 if (!wpa_s->sched_scan_supported)
1737 return;
1738
1739 wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling delayed sched scan");
1740 eloop_cancel_timeout(wpa_supplicant_delayed_sched_scan_timeout,
1741 wpa_s, NULL);
1742 }
1743
1744
1745 /**
1746 * wpa_supplicant_cancel_sched_scan - Stop running scheduled scans
1747 * @wpa_s: Pointer to wpa_supplicant data
1748 *
1749 * This function is used to stop a periodic scheduled scan.
1750 */
1751 void wpa_supplicant_cancel_sched_scan(struct wpa_supplicant *wpa_s)
1752 {
1753 if (!wpa_s->sched_scanning)
1754 return;
1755
1756 if (wpa_s->sched_scanning)
1757 wpa_s->sched_scan_stop_req = 1;
1758
1759 wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling sched scan");
1760 eloop_cancel_timeout(wpa_supplicant_sched_scan_timeout, wpa_s, NULL);
1761 wpa_supplicant_stop_sched_scan(wpa_s);
1762 }
1763
1764
1765 /**
1766 * wpa_supplicant_notify_scanning - Indicate possible scan state change
1767 * @wpa_s: Pointer to wpa_supplicant data
1768 * @scanning: Whether scanning is currently in progress
1769 *
1770 * This function is to generate scanning notifycations. It is called whenever
1771 * there may have been a change in scanning (scan started, completed, stopped).
1772 * wpas_notify_scanning() is called whenever the scanning state changed from the
1773 * previously notified state.
1774 */
1775 void wpa_supplicant_notify_scanning(struct wpa_supplicant *wpa_s,
1776 int scanning)
1777 {
1778 if (wpa_s->scanning != scanning) {
1779 wpa_s->scanning = scanning;
1780 wpas_notify_scanning(wpa_s);
1781 }
1782 }
1783
1784
1785 static int wpa_scan_get_max_rate(const struct wpa_scan_res *res)
1786 {
1787 int rate = 0;
1788 const u8 *ie;
1789 int i;
1790
1791 ie = wpa_scan_get_ie(res, WLAN_EID_SUPP_RATES);
1792 for (i = 0; ie && i < ie[1]; i++) {
1793 if ((ie[i + 2] & 0x7f) > rate)
1794 rate = ie[i + 2] & 0x7f;
1795 }
1796
1797 ie = wpa_scan_get_ie(res, WLAN_EID_EXT_SUPP_RATES);
1798 for (i = 0; ie && i < ie[1]; i++) {
1799 if ((ie[i + 2] & 0x7f) > rate)
1800 rate = ie[i + 2] & 0x7f;
1801 }
1802
1803 return rate;
1804 }
1805
1806
1807 /**
1808 * wpa_scan_get_ie - Fetch a specified information element from a scan result
1809 * @res: Scan result entry
1810 * @ie: Information element identitifier (WLAN_EID_*)
1811 * Returns: Pointer to the information element (id field) or %NULL if not found
1812 *
1813 * This function returns the first matching information element in the scan
1814 * result.
1815 */
1816 const u8 * wpa_scan_get_ie(const struct wpa_scan_res *res, u8 ie)
1817 {
1818 size_t ie_len = res->ie_len;
1819
1820 /* Use the Beacon frame IEs if res->ie_len is not available */
1821 if (!ie_len)
1822 ie_len = res->beacon_ie_len;
1823
1824 return get_ie((const u8 *) (res + 1), ie_len, ie);
1825 }
1826
1827
1828 /**
1829 * wpa_scan_get_vendor_ie - Fetch vendor information element from a scan result
1830 * @res: Scan result entry
1831 * @vendor_type: Vendor type (four octets starting the IE payload)
1832 * Returns: Pointer to the information element (id field) or %NULL if not found
1833 *
1834 * This function returns the first matching information element in the scan
1835 * result.
1836 */
1837 const u8 * wpa_scan_get_vendor_ie(const struct wpa_scan_res *res,
1838 u32 vendor_type)
1839 {
1840 const u8 *end, *pos;
1841
1842 pos = (const u8 *) (res + 1);
1843 end = pos + res->ie_len;
1844
1845 while (end - pos > 1) {
1846 if (2 + pos[1] > end - pos)
1847 break;
1848 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1849 vendor_type == WPA_GET_BE32(&pos[2]))
1850 return pos;
1851 pos += 2 + pos[1];
1852 }
1853
1854 return NULL;
1855 }
1856
1857
1858 /**
1859 * wpa_scan_get_vendor_ie_beacon - Fetch vendor information from a scan result
1860 * @res: Scan result entry
1861 * @vendor_type: Vendor type (four octets starting the IE payload)
1862 * Returns: Pointer to the information element (id field) or %NULL if not found
1863 *
1864 * This function returns the first matching information element in the scan
1865 * result.
1866 *
1867 * This function is like wpa_scan_get_vendor_ie(), but uses IE buffer only
1868 * from Beacon frames instead of either Beacon or Probe Response frames.
1869 */
1870 const u8 * wpa_scan_get_vendor_ie_beacon(const struct wpa_scan_res *res,
1871 u32 vendor_type)
1872 {
1873 const u8 *end, *pos;
1874
1875 if (res->beacon_ie_len == 0)
1876 return NULL;
1877
1878 pos = (const u8 *) (res + 1);
1879 pos += res->ie_len;
1880 end = pos + res->beacon_ie_len;
1881
1882 while (end - pos > 1) {
1883 if (2 + pos[1] > end - pos)
1884 break;
1885 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1886 vendor_type == WPA_GET_BE32(&pos[2]))
1887 return pos;
1888 pos += 2 + pos[1];
1889 }
1890
1891 return NULL;
1892 }
1893
1894
1895 /**
1896 * wpa_scan_get_vendor_ie_multi - Fetch vendor IE data from a scan result
1897 * @res: Scan result entry
1898 * @vendor_type: Vendor type (four octets starting the IE payload)
1899 * Returns: Pointer to the information element payload or %NULL if not found
1900 *
1901 * This function returns concatenated payload of possibly fragmented vendor
1902 * specific information elements in the scan result. The caller is responsible
1903 * for freeing the returned buffer.
1904 */
1905 struct wpabuf * wpa_scan_get_vendor_ie_multi(const struct wpa_scan_res *res,
1906 u32 vendor_type)
1907 {
1908 struct wpabuf *buf;
1909 const u8 *end, *pos;
1910
1911 buf = wpabuf_alloc(res->ie_len);
1912 if (buf == NULL)
1913 return NULL;
1914
1915 pos = (const u8 *) (res + 1);
1916 end = pos + res->ie_len;
1917
1918 while (end - pos > 1) {
1919 if (2 + pos[1] > end - pos)
1920 break;
1921 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1922 vendor_type == WPA_GET_BE32(&pos[2]))
1923 wpabuf_put_data(buf, pos + 2 + 4, pos[1] - 4);
1924 pos += 2 + pos[1];
1925 }
1926
1927 if (wpabuf_len(buf) == 0) {
1928 wpabuf_free(buf);
1929 buf = NULL;
1930 }
1931
1932 return buf;
1933 }
1934
1935
1936 /*
1937 * Channels with a great SNR can operate at full rate. What is a great SNR?
1938 * This doc https://supportforums.cisco.com/docs/DOC-12954 says, "the general
1939 * rule of thumb is that any SNR above 20 is good." This one
1940 * http://www.cisco.com/en/US/tech/tk722/tk809/technologies_q_and_a_item09186a00805e9a96.shtml#qa23
1941 * recommends 25 as a minimum SNR for 54 Mbps data rate. The estimates used in
1942 * scan_est_throughput() allow even smaller SNR values for the maximum rates
1943 * (21 for 54 Mbps, 22 for VHT80 MCS9, 24 for HT40 and HT20 MCS7). Use 25 as a
1944 * somewhat conservative value here.
1945 */
1946 #define GREAT_SNR 25
1947
1948 #define IS_5GHZ(n) (n > 4000)
1949
1950 /* Compare function for sorting scan results. Return >0 if @b is considered
1951 * better. */
1952 static int wpa_scan_result_compar(const void *a, const void *b)
1953 {
1954 #define MIN(a,b) a < b ? a : b
1955 struct wpa_scan_res **_wa = (void *) a;
1956 struct wpa_scan_res **_wb = (void *) b;
1957 struct wpa_scan_res *wa = *_wa;
1958 struct wpa_scan_res *wb = *_wb;
1959 int wpa_a, wpa_b;
1960 int snr_a, snr_b, snr_a_full, snr_b_full;
1961
1962 /* WPA/WPA2 support preferred */
1963 wpa_a = wpa_scan_get_vendor_ie(wa, WPA_IE_VENDOR_TYPE) != NULL ||
1964 wpa_scan_get_ie(wa, WLAN_EID_RSN) != NULL;
1965 wpa_b = wpa_scan_get_vendor_ie(wb, WPA_IE_VENDOR_TYPE) != NULL ||
1966 wpa_scan_get_ie(wb, WLAN_EID_RSN) != NULL;
1967
1968 if (wpa_b && !wpa_a)
1969 return 1;
1970 if (!wpa_b && wpa_a)
1971 return -1;
1972
1973 /* privacy support preferred */
1974 if ((wa->caps & IEEE80211_CAP_PRIVACY) == 0 &&
1975 (wb->caps & IEEE80211_CAP_PRIVACY))
1976 return 1;
1977 if ((wa->caps & IEEE80211_CAP_PRIVACY) &&
1978 (wb->caps & IEEE80211_CAP_PRIVACY) == 0)
1979 return -1;
1980
1981 if (wa->flags & wb->flags & WPA_SCAN_LEVEL_DBM) {
1982 snr_a_full = wa->snr;
1983 snr_a = MIN(wa->snr, GREAT_SNR);
1984 snr_b_full = wb->snr;
1985 snr_b = MIN(wb->snr, GREAT_SNR);
1986 } else {
1987 /* Level is not in dBm, so we can't calculate
1988 * SNR. Just use raw level (units unknown). */
1989 snr_a = snr_a_full = wa->level;
1990 snr_b = snr_b_full = wb->level;
1991 }
1992
1993 /* if SNR is close, decide by max rate or frequency band */
1994 if (snr_a && snr_b && abs(snr_b - snr_a) < 7) {
1995 if (wa->est_throughput != wb->est_throughput)
1996 return (int) wb->est_throughput -
1997 (int) wa->est_throughput;
1998 }
1999 if ((snr_a && snr_b && abs(snr_b - snr_a) < 5) ||
2000 (wa->qual && wb->qual && abs(wb->qual - wa->qual) < 10)) {
2001 if (IS_5GHZ(wa->freq) ^ IS_5GHZ(wb->freq))
2002 return IS_5GHZ(wa->freq) ? -1 : 1;
2003 }
2004
2005 /* all things being equal, use SNR; if SNRs are
2006 * identical, use quality values since some drivers may only report
2007 * that value and leave the signal level zero */
2008 if (snr_b_full == snr_a_full)
2009 return wb->qual - wa->qual;
2010 return snr_b_full - snr_a_full;
2011 #undef MIN
2012 }
2013
2014
2015 #ifdef CONFIG_WPS
2016 /* Compare function for sorting scan results when searching a WPS AP for
2017 * provisioning. Return >0 if @b is considered better. */
2018 static int wpa_scan_result_wps_compar(const void *a, const void *b)
2019 {
2020 struct wpa_scan_res **_wa = (void *) a;
2021 struct wpa_scan_res **_wb = (void *) b;
2022 struct wpa_scan_res *wa = *_wa;
2023 struct wpa_scan_res *wb = *_wb;
2024 int uses_wps_a, uses_wps_b;
2025 struct wpabuf *wps_a, *wps_b;
2026 int res;
2027
2028 /* Optimization - check WPS IE existence before allocated memory and
2029 * doing full reassembly. */
2030 uses_wps_a = wpa_scan_get_vendor_ie(wa, WPS_IE_VENDOR_TYPE) != NULL;
2031 uses_wps_b = wpa_scan_get_vendor_ie(wb, WPS_IE_VENDOR_TYPE) != NULL;
2032 if (uses_wps_a && !uses_wps_b)
2033 return -1;
2034 if (!uses_wps_a && uses_wps_b)
2035 return 1;
2036
2037 if (uses_wps_a && uses_wps_b) {
2038 wps_a = wpa_scan_get_vendor_ie_multi(wa, WPS_IE_VENDOR_TYPE);
2039 wps_b = wpa_scan_get_vendor_ie_multi(wb, WPS_IE_VENDOR_TYPE);
2040 res = wps_ap_priority_compar(wps_a, wps_b);
2041 wpabuf_free(wps_a);
2042 wpabuf_free(wps_b);
2043 if (res)
2044 return res;
2045 }
2046
2047 /*
2048 * Do not use current AP security policy as a sorting criteria during
2049 * WPS provisioning step since the AP may get reconfigured at the
2050 * completion of provisioning.
2051 */
2052
2053 /* all things being equal, use signal level; if signal levels are
2054 * identical, use quality values since some drivers may only report
2055 * that value and leave the signal level zero */
2056 if (wb->level == wa->level)
2057 return wb->qual - wa->qual;
2058 return wb->level - wa->level;
2059 }
2060 #endif /* CONFIG_WPS */
2061
2062
2063 static void dump_scan_res(struct wpa_scan_results *scan_res)
2064 {
2065 #ifndef CONFIG_NO_STDOUT_DEBUG
2066 size_t i;
2067
2068 if (scan_res->res == NULL || scan_res->num == 0)
2069 return;
2070
2071 wpa_printf(MSG_EXCESSIVE, "Sorted scan results");
2072
2073 for (i = 0; i < scan_res->num; i++) {
2074 struct wpa_scan_res *r = scan_res->res[i];
2075 u8 *pos;
2076 if (r->flags & WPA_SCAN_LEVEL_DBM) {
2077 int noise_valid = !(r->flags & WPA_SCAN_NOISE_INVALID);
2078
2079 wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d "
2080 "noise=%d%s level=%d snr=%d%s flags=0x%x age=%u est=%u",
2081 MAC2STR(r->bssid), r->freq, r->qual,
2082 r->noise, noise_valid ? "" : "~", r->level,
2083 r->snr, r->snr >= GREAT_SNR ? "*" : "",
2084 r->flags,
2085 r->age, r->est_throughput);
2086 } else {
2087 wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d "
2088 "noise=%d level=%d flags=0x%x age=%u est=%u",
2089 MAC2STR(r->bssid), r->freq, r->qual,
2090 r->noise, r->level, r->flags, r->age,
2091 r->est_throughput);
2092 }
2093 pos = (u8 *) (r + 1);
2094 if (r->ie_len)
2095 wpa_hexdump(MSG_EXCESSIVE, "IEs", pos, r->ie_len);
2096 pos += r->ie_len;
2097 if (r->beacon_ie_len)
2098 wpa_hexdump(MSG_EXCESSIVE, "Beacon IEs",
2099 pos, r->beacon_ie_len);
2100 }
2101 #endif /* CONFIG_NO_STDOUT_DEBUG */
2102 }
2103
2104
2105 /**
2106 * wpa_supplicant_filter_bssid_match - Is the specified BSSID allowed
2107 * @wpa_s: Pointer to wpa_supplicant data
2108 * @bssid: BSSID to check
2109 * Returns: 0 if the BSSID is filtered or 1 if not
2110 *
2111 * This function is used to filter out specific BSSIDs from scan reslts mainly
2112 * for testing purposes (SET bssid_filter ctrl_iface command).
2113 */
2114 int wpa_supplicant_filter_bssid_match(struct wpa_supplicant *wpa_s,
2115 const u8 *bssid)
2116 {
2117 size_t i;
2118
2119 if (wpa_s->bssid_filter == NULL)
2120 return 1;
2121
2122 for (i = 0; i < wpa_s->bssid_filter_count; i++) {
2123 if (os_memcmp(wpa_s->bssid_filter + i * ETH_ALEN, bssid,
2124 ETH_ALEN) == 0)
2125 return 1;
2126 }
2127
2128 return 0;
2129 }
2130
2131
2132 void filter_scan_res(struct wpa_supplicant *wpa_s,
2133 struct wpa_scan_results *res)
2134 {
2135 size_t i, j;
2136
2137 if (wpa_s->bssid_filter == NULL)
2138 return;
2139
2140 for (i = 0, j = 0; i < res->num; i++) {
2141 if (wpa_supplicant_filter_bssid_match(wpa_s,
2142 res->res[i]->bssid)) {
2143 res->res[j++] = res->res[i];
2144 } else {
2145 os_free(res->res[i]);
2146 res->res[i] = NULL;
2147 }
2148 }
2149
2150 if (res->num != j) {
2151 wpa_printf(MSG_DEBUG, "Filtered out %d scan results",
2152 (int) (res->num - j));
2153 res->num = j;
2154 }
2155 }
2156
2157
2158 /*
2159 * Noise floor values to use when we have signal strength
2160 * measurements, but no noise floor measurements. These values were
2161 * measured in an office environment with many APs.
2162 */
2163 #define DEFAULT_NOISE_FLOOR_2GHZ (-89)
2164 #define DEFAULT_NOISE_FLOOR_5GHZ (-92)
2165
2166 void scan_snr(struct wpa_scan_res *res)
2167 {
2168 if (res->flags & WPA_SCAN_NOISE_INVALID) {
2169 res->noise = IS_5GHZ(res->freq) ?
2170 DEFAULT_NOISE_FLOOR_5GHZ :
2171 DEFAULT_NOISE_FLOOR_2GHZ;
2172 }
2173
2174 if (res->flags & WPA_SCAN_LEVEL_DBM) {
2175 res->snr = res->level - res->noise;
2176 } else {
2177 /* Level is not in dBm, so we can't calculate
2178 * SNR. Just use raw level (units unknown). */
2179 res->snr = res->level;
2180 }
2181 }
2182
2183
2184 static unsigned int max_ht20_rate(int snr)
2185 {
2186 if (snr < 6)
2187 return 6500; /* HT20 MCS0 */
2188 if (snr < 8)
2189 return 13000; /* HT20 MCS1 */
2190 if (snr < 13)
2191 return 19500; /* HT20 MCS2 */
2192 if (snr < 17)
2193 return 26000; /* HT20 MCS3 */
2194 if (snr < 20)
2195 return 39000; /* HT20 MCS4 */
2196 if (snr < 23)
2197 return 52000; /* HT20 MCS5 */
2198 if (snr < 24)
2199 return 58500; /* HT20 MCS6 */
2200 return 65000; /* HT20 MCS7 */
2201 }
2202
2203
2204 static unsigned int max_ht40_rate(int snr)
2205 {
2206 if (snr < 3)
2207 return 13500; /* HT40 MCS0 */
2208 if (snr < 6)
2209 return 27000; /* HT40 MCS1 */
2210 if (snr < 10)
2211 return 40500; /* HT40 MCS2 */
2212 if (snr < 15)
2213 return 54000; /* HT40 MCS3 */
2214 if (snr < 17)
2215 return 81000; /* HT40 MCS4 */
2216 if (snr < 22)
2217 return 108000; /* HT40 MCS5 */
2218 if (snr < 24)
2219 return 121500; /* HT40 MCS6 */
2220 return 135000; /* HT40 MCS7 */
2221 }
2222
2223
2224 static unsigned int max_vht80_rate(int snr)
2225 {
2226 if (snr < 1)
2227 return 0;
2228 if (snr < 2)
2229 return 29300; /* VHT80 MCS0 */
2230 if (snr < 5)
2231 return 58500; /* VHT80 MCS1 */
2232 if (snr < 9)
2233 return 87800; /* VHT80 MCS2 */
2234 if (snr < 11)
2235 return 117000; /* VHT80 MCS3 */
2236 if (snr < 15)
2237 return 175500; /* VHT80 MCS4 */
2238 if (snr < 16)
2239 return 234000; /* VHT80 MCS5 */
2240 if (snr < 18)
2241 return 263300; /* VHT80 MCS6 */
2242 if (snr < 20)
2243 return 292500; /* VHT80 MCS7 */
2244 if (snr < 22)
2245 return 351000; /* VHT80 MCS8 */
2246 return 390000; /* VHT80 MCS9 */
2247 }
2248
2249
2250 void scan_est_throughput(struct wpa_supplicant *wpa_s,
2251 struct wpa_scan_res *res)
2252 {
2253 enum local_hw_capab capab = wpa_s->hw_capab;
2254 int rate; /* max legacy rate in 500 kb/s units */
2255 const u8 *ie;
2256 unsigned int est, tmp;
2257 int snr = res->snr;
2258
2259 if (res->est_throughput)
2260 return;
2261
2262 /* Get maximum legacy rate */
2263 rate = wpa_scan_get_max_rate(res);
2264
2265 /* Limit based on estimated SNR */
2266 if (rate > 1 * 2 && snr < 1)
2267 rate = 1 * 2;
2268 else if (rate > 2 * 2 && snr < 4)
2269 rate = 2 * 2;
2270 else if (rate > 6 * 2 && snr < 5)
2271 rate = 6 * 2;
2272 else if (rate > 9 * 2 && snr < 6)
2273 rate = 9 * 2;
2274 else if (rate > 12 * 2 && snr < 7)
2275 rate = 12 * 2;
2276 else if (rate > 18 * 2 && snr < 10)
2277 rate = 18 * 2;
2278 else if (rate > 24 * 2 && snr < 11)
2279 rate = 24 * 2;
2280 else if (rate > 36 * 2 && snr < 15)
2281 rate = 36 * 2;
2282 else if (rate > 48 * 2 && snr < 19)
2283 rate = 48 * 2;
2284 else if (rate > 54 * 2 && snr < 21)
2285 rate = 54 * 2;
2286 est = rate * 500;
2287
2288 if (capab == CAPAB_HT || capab == CAPAB_HT40 || capab == CAPAB_VHT) {
2289 ie = wpa_scan_get_ie(res, WLAN_EID_HT_CAP);
2290 if (ie) {
2291 tmp = max_ht20_rate(snr);
2292 if (tmp > est)
2293 est = tmp;
2294 }
2295 }
2296
2297 if (capab == CAPAB_HT40 || capab == CAPAB_VHT) {
2298 ie = wpa_scan_get_ie(res, WLAN_EID_HT_OPERATION);
2299 if (ie && ie[1] >= 2 &&
2300 (ie[3] & HT_INFO_HT_PARAM_SECONDARY_CHNL_OFF_MASK)) {
2301 tmp = max_ht40_rate(snr);
2302 if (tmp > est)
2303 est = tmp;
2304 }
2305 }
2306
2307 if (capab == CAPAB_VHT) {
2308 /* Use +1 to assume VHT is always faster than HT */
2309 ie = wpa_scan_get_ie(res, WLAN_EID_VHT_CAP);
2310 if (ie) {
2311 tmp = max_ht20_rate(snr) + 1;
2312 if (tmp > est)
2313 est = tmp;
2314
2315 ie = wpa_scan_get_ie(res, WLAN_EID_HT_OPERATION);
2316 if (ie && ie[1] >= 2 &&
2317 (ie[3] &
2318 HT_INFO_HT_PARAM_SECONDARY_CHNL_OFF_MASK)) {
2319 tmp = max_ht40_rate(snr) + 1;
2320 if (tmp > est)
2321 est = tmp;
2322 }
2323
2324 ie = wpa_scan_get_ie(res, WLAN_EID_VHT_OPERATION);
2325 if (ie && ie[1] >= 1 &&
2326 (ie[2] & VHT_OPMODE_CHANNEL_WIDTH_MASK)) {
2327 tmp = max_vht80_rate(snr) + 1;
2328 if (tmp > est)
2329 est = tmp;
2330 }
2331 }
2332 }
2333
2334 /* TODO: channel utilization and AP load (e.g., from AP Beacon) */
2335
2336 res->est_throughput = est;
2337 }
2338
2339
2340 /**
2341 * wpa_supplicant_get_scan_results - Get scan results
2342 * @wpa_s: Pointer to wpa_supplicant data
2343 * @info: Information about what was scanned or %NULL if not available
2344 * @new_scan: Whether a new scan was performed
2345 * Returns: Scan results, %NULL on failure
2346 *
2347 * This function request the current scan results from the driver and updates
2348 * the local BSS list wpa_s->bss. The caller is responsible for freeing the
2349 * results with wpa_scan_results_free().
2350 */
2351 struct wpa_scan_results *
2352 wpa_supplicant_get_scan_results(struct wpa_supplicant *wpa_s,
2353 struct scan_info *info, int new_scan)
2354 {
2355 struct wpa_scan_results *scan_res;
2356 size_t i;
2357 int (*compar)(const void *, const void *) = wpa_scan_result_compar;
2358
2359 scan_res = wpa_drv_get_scan_results2(wpa_s);
2360 if (scan_res == NULL) {
2361 wpa_dbg(wpa_s, MSG_DEBUG, "Failed to get scan results");
2362 return NULL;
2363 }
2364 if (scan_res->fetch_time.sec == 0) {
2365 /*
2366 * Make sure we have a valid timestamp if the driver wrapper
2367 * does not set this.
2368 */
2369 os_get_reltime(&scan_res->fetch_time);
2370 }
2371 filter_scan_res(wpa_s, scan_res);
2372
2373 for (i = 0; i < scan_res->num; i++) {
2374 struct wpa_scan_res *scan_res_item = scan_res->res[i];
2375
2376 scan_snr(scan_res_item);
2377 scan_est_throughput(wpa_s, scan_res_item);
2378 }
2379
2380 #ifdef CONFIG_WPS
2381 if (wpas_wps_searching(wpa_s)) {
2382 wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Order scan results with WPS "
2383 "provisioning rules");
2384 compar = wpa_scan_result_wps_compar;
2385 }
2386 #endif /* CONFIG_WPS */
2387
2388 if (scan_res->res) {
2389 qsort(scan_res->res, scan_res->num,
2390 sizeof(struct wpa_scan_res *), compar);
2391 }
2392 dump_scan_res(scan_res);
2393
2394 if (wpa_s->ignore_post_flush_scan_res) {
2395 /* FLUSH command aborted an ongoing scan and these are the
2396 * results from the aborted scan. Do not process the results to
2397 * maintain flushed state. */
2398 wpa_dbg(wpa_s, MSG_DEBUG,
2399 "Do not update BSS table based on pending post-FLUSH scan results");
2400 wpa_s->ignore_post_flush_scan_res = 0;
2401 return scan_res;
2402 }
2403
2404 wpa_bss_update_start(wpa_s);
2405 for (i = 0; i < scan_res->num; i++)
2406 wpa_bss_update_scan_res(wpa_s, scan_res->res[i],
2407 &scan_res->fetch_time);
2408 wpa_bss_update_end(wpa_s, info, new_scan);
2409
2410 return scan_res;
2411 }
2412
2413
2414 /**
2415 * wpa_supplicant_update_scan_results - Update scan results from the driver
2416 * @wpa_s: Pointer to wpa_supplicant data
2417 * Returns: 0 on success, -1 on failure
2418 *
2419 * This function updates the BSS table within wpa_supplicant based on the
2420 * currently available scan results from the driver without requesting a new
2421 * scan. This is used in cases where the driver indicates an association
2422 * (including roaming within ESS) and wpa_supplicant does not yet have the
2423 * needed information to complete the connection (e.g., to perform validation
2424 * steps in 4-way handshake).
2425 */
2426 int wpa_supplicant_update_scan_results(struct wpa_supplicant *wpa_s)
2427 {
2428 struct wpa_scan_results *scan_res;
2429 scan_res = wpa_supplicant_get_scan_results(wpa_s, NULL, 0);
2430 if (scan_res == NULL)
2431 return -1;
2432 wpa_scan_results_free(scan_res);
2433
2434 return 0;
2435 }
2436
2437
2438 /**
2439 * scan_only_handler - Reports scan results
2440 */
2441 void scan_only_handler(struct wpa_supplicant *wpa_s,
2442 struct wpa_scan_results *scan_res)
2443 {
2444 wpa_dbg(wpa_s, MSG_DEBUG, "Scan-only results received");
2445 if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
2446 wpa_s->manual_scan_use_id && wpa_s->own_scan_running) {
2447 wpa_msg_ctrl(wpa_s, MSG_INFO, WPA_EVENT_SCAN_RESULTS "id=%u",
2448 wpa_s->manual_scan_id);
2449 wpa_s->manual_scan_use_id = 0;
2450 } else {
2451 wpa_msg_ctrl(wpa_s, MSG_INFO, WPA_EVENT_SCAN_RESULTS);
2452 }
2453 wpas_notify_scan_results(wpa_s);
2454 wpas_notify_scan_done(wpa_s, 1);
2455 if (wpa_s->scan_work) {
2456 struct wpa_radio_work *work = wpa_s->scan_work;
2457 wpa_s->scan_work = NULL;
2458 radio_work_done(work);
2459 }
2460
2461 if (wpa_s->wpa_state == WPA_SCANNING)
2462 wpa_supplicant_set_state(wpa_s, wpa_s->scan_prev_wpa_state);
2463 }
2464
2465
2466 int wpas_scan_scheduled(struct wpa_supplicant *wpa_s)
2467 {
2468 return eloop_is_timeout_registered(wpa_supplicant_scan, wpa_s, NULL);
2469 }
2470
2471
2472 struct wpa_driver_scan_params *
2473 wpa_scan_clone_params(const struct wpa_driver_scan_params *src)
2474 {
2475 struct wpa_driver_scan_params *params;
2476 size_t i;
2477 u8 *n;
2478
2479 params = os_zalloc(sizeof(*params));
2480 if (params == NULL)
2481 return NULL;
2482
2483 for (i = 0; i < src->num_ssids; i++) {
2484 if (src->ssids[i].ssid) {
2485 n = os_memdup(src->ssids[i].ssid,
2486 src->ssids[i].ssid_len);
2487 if (n == NULL)
2488 goto failed;
2489 params->ssids[i].ssid = n;
2490 params->ssids[i].ssid_len = src->ssids[i].ssid_len;
2491 }
2492 }
2493 params->num_ssids = src->num_ssids;
2494
2495 if (src->extra_ies) {
2496 n = os_memdup(src->extra_ies, src->extra_ies_len);
2497 if (n == NULL)
2498 goto failed;
2499 params->extra_ies = n;
2500 params->extra_ies_len = src->extra_ies_len;
2501 }
2502
2503 if (src->freqs) {
2504 int len = int_array_len(src->freqs);
2505 params->freqs = os_memdup(src->freqs, (len + 1) * sizeof(int));
2506 if (params->freqs == NULL)
2507 goto failed;
2508 }
2509
2510 if (src->filter_ssids) {
2511 params->filter_ssids = os_memdup(src->filter_ssids,
2512 sizeof(*params->filter_ssids) *
2513 src->num_filter_ssids);
2514 if (params->filter_ssids == NULL)
2515 goto failed;
2516 params->num_filter_ssids = src->num_filter_ssids;
2517 }
2518
2519 params->filter_rssi = src->filter_rssi;
2520 params->p2p_probe = src->p2p_probe;
2521 params->only_new_results = src->only_new_results;
2522 params->low_priority = src->low_priority;
2523 params->duration = src->duration;
2524 params->duration_mandatory = src->duration_mandatory;
2525 params->oce_scan = src->oce_scan;
2526
2527 if (src->sched_scan_plans_num > 0) {
2528 params->sched_scan_plans =
2529 os_memdup(src->sched_scan_plans,
2530 sizeof(*src->sched_scan_plans) *
2531 src->sched_scan_plans_num);
2532 if (!params->sched_scan_plans)
2533 goto failed;
2534
2535 params->sched_scan_plans_num = src->sched_scan_plans_num;
2536 }
2537
2538 if (src->mac_addr_rand) {
2539 params->mac_addr_rand = src->mac_addr_rand;
2540
2541 if (src->mac_addr && src->mac_addr_mask) {
2542 u8 *mac_addr;
2543
2544 mac_addr = os_malloc(2 * ETH_ALEN);
2545 if (!mac_addr)
2546 goto failed;
2547
2548 os_memcpy(mac_addr, src->mac_addr, ETH_ALEN);
2549 os_memcpy(mac_addr + ETH_ALEN, src->mac_addr_mask,
2550 ETH_ALEN);
2551 params->mac_addr = mac_addr;
2552 params->mac_addr_mask = mac_addr + ETH_ALEN;
2553 }
2554 }
2555
2556 if (src->bssid) {
2557 u8 *bssid;
2558
2559 bssid = os_memdup(src->bssid, ETH_ALEN);
2560 if (!bssid)
2561 goto failed;
2562 params->bssid = bssid;
2563 }
2564
2565 params->relative_rssi_set = src->relative_rssi_set;
2566 params->relative_rssi = src->relative_rssi;
2567 params->relative_adjust_band = src->relative_adjust_band;
2568 params->relative_adjust_rssi = src->relative_adjust_rssi;
2569 return params;
2570
2571 failed:
2572 wpa_scan_free_params(params);
2573 return NULL;
2574 }
2575
2576
2577 void wpa_scan_free_params(struct wpa_driver_scan_params *params)
2578 {
2579 size_t i;
2580
2581 if (params == NULL)
2582 return;
2583
2584 for (i = 0; i < params->num_ssids; i++)
2585 os_free((u8 *) params->ssids[i].ssid);
2586 os_free((u8 *) params->extra_ies);
2587 os_free(params->freqs);
2588 os_free(params->filter_ssids);
2589 os_free(params->sched_scan_plans);
2590
2591 /*
2592 * Note: params->mac_addr_mask points to same memory allocation and
2593 * must not be freed separately.
2594 */
2595 os_free((u8 *) params->mac_addr);
2596
2597 os_free((u8 *) params->bssid);
2598
2599 os_free(params);
2600 }
2601
2602
2603 int wpas_start_pno(struct wpa_supplicant *wpa_s)
2604 {
2605 int ret, prio;
2606 size_t i, num_ssid, num_match_ssid;
2607 struct wpa_ssid *ssid;
2608 struct wpa_driver_scan_params params;
2609 struct sched_scan_plan scan_plan;
2610 unsigned int max_sched_scan_ssids;
2611
2612 if (!wpa_s->sched_scan_supported)
2613 return -1;
2614
2615 if (wpa_s->max_sched_scan_ssids > WPAS_MAX_SCAN_SSIDS)
2616 max_sched_scan_ssids = WPAS_MAX_SCAN_SSIDS;
2617 else
2618 max_sched_scan_ssids = wpa_s->max_sched_scan_ssids;
2619 if (max_sched_scan_ssids < 1)
2620 return -1;
2621
2622 if (wpa_s->pno || wpa_s->pno_sched_pending)
2623 return 0;
2624
2625 if ((wpa_s->wpa_state > WPA_SCANNING) &&
2626 (wpa_s->wpa_state < WPA_COMPLETED)) {
2627 wpa_printf(MSG_ERROR, "PNO: In assoc process");
2628 return -EAGAIN;
2629 }
2630
2631 if (wpa_s->wpa_state == WPA_SCANNING) {
2632 wpa_supplicant_cancel_scan(wpa_s);
2633 if (wpa_s->sched_scanning) {
2634 wpa_printf(MSG_DEBUG, "Schedule PNO on completion of "
2635 "ongoing sched scan");
2636 wpa_supplicant_cancel_sched_scan(wpa_s);
2637 wpa_s->pno_sched_pending = 1;
2638 return 0;
2639 }
2640 }
2641
2642 if (wpa_s->sched_scan_stop_req) {
2643 wpa_printf(MSG_DEBUG,
2644 "Schedule PNO after previous sched scan has stopped");
2645 wpa_s->pno_sched_pending = 1;
2646 return 0;
2647 }
2648
2649 os_memset(&params, 0, sizeof(params));
2650
2651 num_ssid = num_match_ssid = 0;
2652 ssid = wpa_s->conf->ssid;
2653 while (ssid) {
2654 if (!wpas_network_disabled(wpa_s, ssid)) {
2655 num_match_ssid++;
2656 if (ssid->scan_ssid)
2657 num_ssid++;
2658 }
2659 ssid = ssid->next;
2660 }
2661
2662 if (num_match_ssid == 0) {
2663 wpa_printf(MSG_DEBUG, "PNO: No configured SSIDs");
2664 return -1;
2665 }
2666
2667 if (num_match_ssid > num_ssid) {
2668 params.num_ssids++; /* wildcard */
2669 num_ssid++;
2670 }
2671
2672 if (num_ssid > max_sched_scan_ssids) {
2673 wpa_printf(MSG_DEBUG, "PNO: Use only the first %u SSIDs from "
2674 "%u", max_sched_scan_ssids, (unsigned int) num_ssid);
2675 num_ssid = max_sched_scan_ssids;
2676 }
2677
2678 if (num_match_ssid > wpa_s->max_match_sets) {
2679 num_match_ssid = wpa_s->max_match_sets;
2680 wpa_dbg(wpa_s, MSG_DEBUG, "PNO: Too many SSIDs to match");
2681 }
2682 params.filter_ssids = os_calloc(num_match_ssid,
2683 sizeof(struct wpa_driver_scan_filter));
2684 if (params.filter_ssids == NULL)
2685 return -1;
2686
2687 i = 0;
2688 prio = 0;
2689 ssid = wpa_s->conf->pssid[prio];
2690 while (ssid) {
2691 if (!wpas_network_disabled(wpa_s, ssid)) {
2692 if (ssid->scan_ssid && params.num_ssids < num_ssid) {
2693 params.ssids[params.num_ssids].ssid =
2694 ssid->ssid;
2695 params.ssids[params.num_ssids].ssid_len =
2696 ssid->ssid_len;
2697 params.num_ssids++;
2698 }
2699 os_memcpy(params.filter_ssids[i].ssid, ssid->ssid,
2700 ssid->ssid_len);
2701 params.filter_ssids[i].ssid_len = ssid->ssid_len;
2702 params.num_filter_ssids++;
2703 i++;
2704 if (i == num_match_ssid)
2705 break;
2706 }
2707 if (ssid->pnext)
2708 ssid = ssid->pnext;
2709 else if (prio + 1 == wpa_s->conf->num_prio)
2710 break;
2711 else
2712 ssid = wpa_s->conf->pssid[++prio];
2713 }
2714
2715 if (wpa_s->conf->filter_rssi)
2716 params.filter_rssi = wpa_s->conf->filter_rssi;
2717
2718 if (wpa_s->sched_scan_plans_num) {
2719 params.sched_scan_plans = wpa_s->sched_scan_plans;
2720 params.sched_scan_plans_num = wpa_s->sched_scan_plans_num;
2721 } else {
2722 /* Set one scan plan that will run infinitely */
2723 if (wpa_s->conf->sched_scan_interval)
2724 scan_plan.interval = wpa_s->conf->sched_scan_interval;
2725 else
2726 scan_plan.interval = 10;
2727
2728 scan_plan.iterations = 0;
2729 params.sched_scan_plans = &scan_plan;
2730 params.sched_scan_plans_num = 1;
2731 }
2732
2733 params.sched_scan_start_delay = wpa_s->conf->sched_scan_start_delay;
2734
2735 if (params.freqs == NULL && wpa_s->manual_sched_scan_freqs) {
2736 wpa_dbg(wpa_s, MSG_DEBUG, "Limit sched scan to specified channels");
2737 params.freqs = wpa_s->manual_sched_scan_freqs;
2738 }
2739
2740 if ((wpa_s->mac_addr_rand_enable & MAC_ADDR_RAND_PNO) &&
2741 wpa_s->wpa_state <= WPA_SCANNING) {
2742 params.mac_addr_rand = 1;
2743 if (wpa_s->mac_addr_pno) {
2744 params.mac_addr = wpa_s->mac_addr_pno;
2745 params.mac_addr_mask = wpa_s->mac_addr_pno + ETH_ALEN;
2746 }
2747 }
2748
2749 wpa_scan_set_relative_rssi_params(wpa_s, &params);
2750
2751 ret = wpa_supplicant_start_sched_scan(wpa_s, &params);
2752 os_free(params.filter_ssids);
2753 if (ret == 0)
2754 wpa_s->pno = 1;
2755 else
2756 wpa_msg(wpa_s, MSG_ERROR, "Failed to schedule PNO");
2757 return ret;
2758 }
2759
2760
2761 int wpas_stop_pno(struct wpa_supplicant *wpa_s)
2762 {
2763 int ret = 0;
2764
2765 if (!wpa_s->pno)
2766 return 0;
2767
2768 ret = wpa_supplicant_stop_sched_scan(wpa_s);
2769 wpa_s->sched_scan_stop_req = 1;
2770
2771 wpa_s->pno = 0;
2772 wpa_s->pno_sched_pending = 0;
2773
2774 if (wpa_s->wpa_state == WPA_SCANNING)
2775 wpa_supplicant_req_scan(wpa_s, 0, 0);
2776
2777 return ret;
2778 }
2779
2780
2781 void wpas_mac_addr_rand_scan_clear(struct wpa_supplicant *wpa_s,
2782 unsigned int type)
2783 {
2784 type &= MAC_ADDR_RAND_ALL;
2785 wpa_s->mac_addr_rand_enable &= ~type;
2786
2787 if (type & MAC_ADDR_RAND_SCAN) {
2788 os_free(wpa_s->mac_addr_scan);
2789 wpa_s->mac_addr_scan = NULL;
2790 }
2791
2792 if (type & MAC_ADDR_RAND_SCHED_SCAN) {
2793 os_free(wpa_s->mac_addr_sched_scan);
2794 wpa_s->mac_addr_sched_scan = NULL;
2795 }
2796
2797 if (type & MAC_ADDR_RAND_PNO) {
2798 os_free(wpa_s->mac_addr_pno);
2799 wpa_s->mac_addr_pno = NULL;
2800 }
2801 }
2802
2803
2804 int wpas_mac_addr_rand_scan_set(struct wpa_supplicant *wpa_s,
2805 unsigned int type, const u8 *addr,
2806 const u8 *mask)
2807 {
2808 u8 *tmp = NULL;
2809
2810 if ((wpa_s->mac_addr_rand_supported & type) != type ) {
2811 wpa_printf(MSG_INFO,
2812 "scan: MAC randomization type %u != supported=%u",
2813 type, wpa_s->mac_addr_rand_supported);
2814 return -1;
2815 }
2816
2817 wpas_mac_addr_rand_scan_clear(wpa_s, type);
2818
2819 if (addr) {
2820 tmp = os_malloc(2 * ETH_ALEN);
2821 if (!tmp)
2822 return -1;
2823 os_memcpy(tmp, addr, ETH_ALEN);
2824 os_memcpy(tmp + ETH_ALEN, mask, ETH_ALEN);
2825 }
2826
2827 if (type == MAC_ADDR_RAND_SCAN) {
2828 wpa_s->mac_addr_scan = tmp;
2829 } else if (type == MAC_ADDR_RAND_SCHED_SCAN) {
2830 wpa_s->mac_addr_sched_scan = tmp;
2831 } else if (type == MAC_ADDR_RAND_PNO) {
2832 wpa_s->mac_addr_pno = tmp;
2833 } else {
2834 wpa_printf(MSG_INFO,
2835 "scan: Invalid MAC randomization type=0x%x",
2836 type);
2837 os_free(tmp);
2838 return -1;
2839 }
2840
2841 wpa_s->mac_addr_rand_enable |= type;
2842 return 0;
2843 }
2844
2845
2846 int wpas_abort_ongoing_scan(struct wpa_supplicant *wpa_s)
2847 {
2848 struct wpa_radio_work *work;
2849 struct wpa_radio *radio = wpa_s->radio;
2850
2851 dl_list_for_each(work, &radio->work, struct wpa_radio_work, list) {
2852 if (work->wpa_s != wpa_s || !work->started ||
2853 (os_strcmp(work->type, "scan") != 0 &&
2854 os_strcmp(work->type, "p2p-scan") != 0))
2855 continue;
2856 wpa_dbg(wpa_s, MSG_DEBUG, "Abort an ongoing scan");
2857 return wpa_drv_abort_scan(wpa_s, wpa_s->curr_scan_cookie);
2858 }
2859
2860 wpa_dbg(wpa_s, MSG_DEBUG, "No ongoing scan/p2p-scan found to abort");
2861 return -1;
2862 }
2863
2864
2865 int wpas_sched_scan_plans_set(struct wpa_supplicant *wpa_s, const char *cmd)
2866 {
2867 struct sched_scan_plan *scan_plans = NULL;
2868 const char *token, *context = NULL;
2869 unsigned int num = 0;
2870
2871 if (!cmd)
2872 return -1;
2873
2874 if (!cmd[0]) {
2875 wpa_printf(MSG_DEBUG, "Clear sched scan plans");
2876 os_free(wpa_s->sched_scan_plans);
2877 wpa_s->sched_scan_plans = NULL;
2878 wpa_s->sched_scan_plans_num = 0;
2879 return 0;
2880 }
2881
2882 while ((token = cstr_token(cmd, " ", &context))) {
2883 int ret;
2884 struct sched_scan_plan *scan_plan, *n;
2885
2886 n = os_realloc_array(scan_plans, num + 1, sizeof(*scan_plans));
2887 if (!n)
2888 goto fail;
2889
2890 scan_plans = n;
2891 scan_plan = &scan_plans[num];
2892 num++;
2893
2894 ret = sscanf(token, "%u:%u", &scan_plan->interval,
2895 &scan_plan->iterations);
2896 if (ret <= 0 || ret > 2 || !scan_plan->interval) {
2897 wpa_printf(MSG_ERROR,
2898 "Invalid sched scan plan input: %s", token);
2899 goto fail;
2900 }
2901
2902 if (scan_plan->interval > wpa_s->max_sched_scan_plan_interval) {
2903 wpa_printf(MSG_WARNING,
2904 "scan plan %u: Scan interval too long(%u), use the maximum allowed(%u)",
2905 num, scan_plan->interval,
2906 wpa_s->max_sched_scan_plan_interval);
2907 scan_plan->interval =
2908 wpa_s->max_sched_scan_plan_interval;
2909 }
2910
2911 if (ret == 1) {
2912 scan_plan->iterations = 0;
2913 break;
2914 }
2915
2916 if (!scan_plan->iterations) {
2917 wpa_printf(MSG_ERROR,
2918 "scan plan %u: Number of iterations cannot be zero",
2919 num);
2920 goto fail;
2921 }
2922
2923 if (scan_plan->iterations >
2924 wpa_s->max_sched_scan_plan_iterations) {
2925 wpa_printf(MSG_WARNING,
2926 "scan plan %u: Too many iterations(%u), use the maximum allowed(%u)",
2927 num, scan_plan->iterations,
2928 wpa_s->max_sched_scan_plan_iterations);
2929 scan_plan->iterations =
2930 wpa_s->max_sched_scan_plan_iterations;
2931 }
2932
2933 wpa_printf(MSG_DEBUG,
2934 "scan plan %u: interval=%u iterations=%u",
2935 num, scan_plan->interval, scan_plan->iterations);
2936 }
2937
2938 if (!scan_plans) {
2939 wpa_printf(MSG_ERROR, "Invalid scan plans entry");
2940 goto fail;
2941 }
2942
2943 if (cstr_token(cmd, " ", &context) || scan_plans[num - 1].iterations) {
2944 wpa_printf(MSG_ERROR,
2945 "All scan plans but the last must specify a number of iterations");
2946 goto fail;
2947 }
2948
2949 wpa_printf(MSG_DEBUG, "scan plan %u (last plan): interval=%u",
2950 num, scan_plans[num - 1].interval);
2951
2952 if (num > wpa_s->max_sched_scan_plans) {
2953 wpa_printf(MSG_WARNING,
2954 "Too many scheduled scan plans (only %u supported)",
2955 wpa_s->max_sched_scan_plans);
2956 wpa_printf(MSG_WARNING,
2957 "Use only the first %u scan plans, and the last one (in infinite loop)",
2958 wpa_s->max_sched_scan_plans - 1);
2959 os_memcpy(&scan_plans[wpa_s->max_sched_scan_plans - 1],
2960 &scan_plans[num - 1], sizeof(*scan_plans));
2961 num = wpa_s->max_sched_scan_plans;
2962 }
2963
2964 os_free(wpa_s->sched_scan_plans);
2965 wpa_s->sched_scan_plans = scan_plans;
2966 wpa_s->sched_scan_plans_num = num;
2967
2968 return 0;
2969
2970 fail:
2971 os_free(scan_plans);
2972 wpa_printf(MSG_ERROR, "invalid scan plans list");
2973 return -1;
2974 }
2975
2976
2977 /**
2978 * wpas_scan_reset_sched_scan - Reset sched_scan state
2979 * @wpa_s: Pointer to wpa_supplicant data
2980 *
2981 * This function is used to cancel a running scheduled scan and to reset an
2982 * internal scan state to continue with a regular scan on the following
2983 * wpa_supplicant_req_scan() calls.
2984 */
2985 void wpas_scan_reset_sched_scan(struct wpa_supplicant *wpa_s)
2986 {
2987 wpa_s->normal_scans = 0;
2988 if (wpa_s->sched_scanning) {
2989 wpa_s->sched_scan_timed_out = 0;
2990 wpa_s->prev_sched_ssid = NULL;
2991 wpa_supplicant_cancel_sched_scan(wpa_s);
2992 }
2993 }
2994
2995
2996 void wpas_scan_restart_sched_scan(struct wpa_supplicant *wpa_s)
2997 {
2998 /* simulate timeout to restart the sched scan */
2999 wpa_s->sched_scan_timed_out = 1;
3000 wpa_s->prev_sched_ssid = NULL;
3001 wpa_supplicant_cancel_sched_scan(wpa_s);
3002 }
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