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Add support to sched scan to report relatively better BSSs
[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->next_scan_freqs) {
1022 wpa_dbg(wpa_s, MSG_DEBUG, "Optimize scan based on previously "
1023 "generated frequency list");
1024 params.freqs = wpa_s->next_scan_freqs;
1025 } else
1026 os_free(wpa_s->next_scan_freqs);
1027 wpa_s->next_scan_freqs = NULL;
1028 wpa_setband_scan_freqs(wpa_s, &params);
1029
1030 /* See if user specified frequencies. If so, scan only those. */
1031 if (wpa_s->conf->freq_list && !params.freqs) {
1032 wpa_dbg(wpa_s, MSG_DEBUG,
1033 "Optimize scan based on conf->freq_list");
1034 int_array_concat(&params.freqs, wpa_s->conf->freq_list);
1035 }
1036
1037 /* Use current associated channel? */
1038 if (wpa_s->conf->scan_cur_freq && !params.freqs) {
1039 unsigned int num = wpa_s->num_multichan_concurrent;
1040
1041 params.freqs = os_calloc(num + 1, sizeof(int));
1042 if (params.freqs) {
1043 num = get_shared_radio_freqs(wpa_s, params.freqs, num);
1044 if (num > 0) {
1045 wpa_dbg(wpa_s, MSG_DEBUG, "Scan only the "
1046 "current operating channels since "
1047 "scan_cur_freq is enabled");
1048 } else {
1049 os_free(params.freqs);
1050 params.freqs = NULL;
1051 }
1052 }
1053 }
1054
1055 params.filter_ssids = wpa_supplicant_build_filter_ssids(
1056 wpa_s->conf, &params.num_filter_ssids);
1057 if (extra_ie) {
1058 params.extra_ies = wpabuf_head(extra_ie);
1059 params.extra_ies_len = wpabuf_len(extra_ie);
1060 }
1061
1062 #ifdef CONFIG_P2P
1063 if (wpa_s->p2p_in_provisioning || wpa_s->p2p_in_invitation ||
1064 (wpa_s->show_group_started && wpa_s->go_params)) {
1065 /*
1066 * The interface may not yet be in P2P mode, so we have to
1067 * explicitly request P2P probe to disable CCK rates.
1068 */
1069 params.p2p_probe = 1;
1070 }
1071 #endif /* CONFIG_P2P */
1072
1073 if ((wpa_s->mac_addr_rand_enable & MAC_ADDR_RAND_SCAN) &&
1074 wpa_s->wpa_state <= WPA_SCANNING) {
1075 params.mac_addr_rand = 1;
1076 if (wpa_s->mac_addr_scan) {
1077 params.mac_addr = wpa_s->mac_addr_scan;
1078 params.mac_addr_mask = wpa_s->mac_addr_scan + ETH_ALEN;
1079 }
1080 }
1081
1082 if (!is_zero_ether_addr(wpa_s->next_scan_bssid)) {
1083 struct wpa_bss *bss;
1084
1085 params.bssid = wpa_s->next_scan_bssid;
1086 bss = wpa_bss_get_bssid_latest(wpa_s, params.bssid);
1087 if (bss && bss->ssid_len && params.num_ssids == 1 &&
1088 params.ssids[0].ssid_len == 0) {
1089 params.ssids[0].ssid = bss->ssid;
1090 params.ssids[0].ssid_len = bss->ssid_len;
1091 wpa_dbg(wpa_s, MSG_DEBUG,
1092 "Scan a previously specified BSSID " MACSTR
1093 " and SSID %s",
1094 MAC2STR(params.bssid),
1095 wpa_ssid_txt(bss->ssid, bss->ssid_len));
1096 } else {
1097 wpa_dbg(wpa_s, MSG_DEBUG,
1098 "Scan a previously specified BSSID " MACSTR,
1099 MAC2STR(params.bssid));
1100 }
1101 }
1102
1103 scan_params = &params;
1104
1105 scan:
1106 #ifdef CONFIG_P2P
1107 /*
1108 * If the driver does not support multi-channel concurrency and a
1109 * virtual interface that shares the same radio with the wpa_s interface
1110 * is operating there may not be need to scan other channels apart from
1111 * the current operating channel on the other virtual interface. Filter
1112 * out other channels in case we are trying to find a connection for a
1113 * station interface when we are not configured to prefer station
1114 * connection and a concurrent operation is already in process.
1115 */
1116 if (wpa_s->scan_for_connection &&
1117 wpa_s->last_scan_req == NORMAL_SCAN_REQ &&
1118 !scan_params->freqs && !params.freqs &&
1119 wpas_is_p2p_prioritized(wpa_s) &&
1120 wpa_s->p2p_group_interface == NOT_P2P_GROUP_INTERFACE &&
1121 non_p2p_network_enabled(wpa_s)) {
1122 unsigned int num = wpa_s->num_multichan_concurrent;
1123
1124 params.freqs = os_calloc(num + 1, sizeof(int));
1125 if (params.freqs) {
1126 num = get_shared_radio_freqs(wpa_s, params.freqs, num);
1127 if (num > 0 && num == wpa_s->num_multichan_concurrent) {
1128 wpa_dbg(wpa_s, MSG_DEBUG, "Scan only the current operating channels since all channels are already used");
1129 } else {
1130 os_free(params.freqs);
1131 params.freqs = NULL;
1132 }
1133 }
1134 }
1135 #endif /* CONFIG_P2P */
1136
1137 ret = wpa_supplicant_trigger_scan(wpa_s, scan_params);
1138
1139 if (ret && wpa_s->last_scan_req == MANUAL_SCAN_REQ && params.freqs &&
1140 !wpa_s->manual_scan_freqs) {
1141 /* Restore manual_scan_freqs for the next attempt */
1142 wpa_s->manual_scan_freqs = params.freqs;
1143 params.freqs = NULL;
1144 }
1145
1146 wpabuf_free(extra_ie);
1147 os_free(params.freqs);
1148 os_free(params.filter_ssids);
1149
1150 if (ret) {
1151 wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate AP scan");
1152 if (wpa_s->scan_prev_wpa_state != wpa_s->wpa_state)
1153 wpa_supplicant_set_state(wpa_s,
1154 wpa_s->scan_prev_wpa_state);
1155 /* Restore scan_req since we will try to scan again */
1156 wpa_s->scan_req = wpa_s->last_scan_req;
1157 wpa_supplicant_req_scan(wpa_s, 1, 0);
1158 } else {
1159 wpa_s->scan_for_connection = 0;
1160 #ifdef CONFIG_INTERWORKING
1161 wpa_s->interworking_fast_assoc_tried = 0;
1162 #endif /* CONFIG_INTERWORKING */
1163 if (params.bssid)
1164 os_memset(wpa_s->next_scan_bssid, 0, ETH_ALEN);
1165 }
1166 }
1167
1168
1169 void wpa_supplicant_update_scan_int(struct wpa_supplicant *wpa_s, int sec)
1170 {
1171 struct os_reltime remaining, new_int;
1172 int cancelled;
1173
1174 cancelled = eloop_cancel_timeout_one(wpa_supplicant_scan, wpa_s, NULL,
1175 &remaining);
1176
1177 new_int.sec = sec;
1178 new_int.usec = 0;
1179 if (cancelled && os_reltime_before(&remaining, &new_int)) {
1180 new_int.sec = remaining.sec;
1181 new_int.usec = remaining.usec;
1182 }
1183
1184 if (cancelled) {
1185 eloop_register_timeout(new_int.sec, new_int.usec,
1186 wpa_supplicant_scan, wpa_s, NULL);
1187 }
1188 wpa_s->scan_interval = sec;
1189 }
1190
1191
1192 /**
1193 * wpa_supplicant_req_scan - Schedule a scan for neighboring access points
1194 * @wpa_s: Pointer to wpa_supplicant data
1195 * @sec: Number of seconds after which to scan
1196 * @usec: Number of microseconds after which to scan
1197 *
1198 * This function is used to schedule a scan for neighboring access points after
1199 * the specified time.
1200 */
1201 void wpa_supplicant_req_scan(struct wpa_supplicant *wpa_s, int sec, int usec)
1202 {
1203 int res;
1204
1205 if (wpa_s->p2p_mgmt) {
1206 wpa_dbg(wpa_s, MSG_DEBUG,
1207 "Ignore scan request (%d.%06d sec) on p2p_mgmt interface",
1208 sec, usec);
1209 return;
1210 }
1211
1212 res = eloop_deplete_timeout(sec, usec, wpa_supplicant_scan, wpa_s,
1213 NULL);
1214 if (res == 1) {
1215 wpa_dbg(wpa_s, MSG_DEBUG, "Rescheduling scan request: %d.%06d sec",
1216 sec, usec);
1217 } else if (res == 0) {
1218 wpa_dbg(wpa_s, MSG_DEBUG, "Ignore new scan request for %d.%06d sec since an earlier request is scheduled to trigger sooner",
1219 sec, usec);
1220 } else {
1221 wpa_dbg(wpa_s, MSG_DEBUG, "Setting scan request: %d.%06d sec",
1222 sec, usec);
1223 eloop_register_timeout(sec, usec, wpa_supplicant_scan, wpa_s, NULL);
1224 }
1225 }
1226
1227
1228 /**
1229 * wpa_supplicant_delayed_sched_scan - Request a delayed scheduled scan
1230 * @wpa_s: Pointer to wpa_supplicant data
1231 * @sec: Number of seconds after which to scan
1232 * @usec: Number of microseconds after which to scan
1233 * Returns: 0 on success or -1 otherwise
1234 *
1235 * This function is used to schedule periodic scans for neighboring
1236 * access points after the specified time.
1237 */
1238 int wpa_supplicant_delayed_sched_scan(struct wpa_supplicant *wpa_s,
1239 int sec, int usec)
1240 {
1241 if (!wpa_s->sched_scan_supported)
1242 return -1;
1243
1244 eloop_register_timeout(sec, usec,
1245 wpa_supplicant_delayed_sched_scan_timeout,
1246 wpa_s, NULL);
1247
1248 return 0;
1249 }
1250
1251
1252 static void
1253 wpa_scan_set_relative_rssi_params(struct wpa_supplicant *wpa_s,
1254 struct wpa_driver_scan_params *params)
1255 {
1256 if (wpa_s->wpa_state != WPA_COMPLETED ||
1257 !(wpa_s->drv_flags & WPA_DRIVER_FLAGS_SCHED_SCAN_RELATIVE_RSSI) ||
1258 wpa_s->srp.relative_rssi_set == 0)
1259 return;
1260
1261 params->relative_rssi_set = 1;
1262 params->relative_rssi = wpa_s->srp.relative_rssi;
1263
1264 if (wpa_s->srp.relative_adjust_rssi == 0)
1265 return;
1266
1267 params->relative_adjust_band = wpa_s->srp.relative_adjust_band;
1268 params->relative_adjust_rssi = wpa_s->srp.relative_adjust_rssi;
1269 }
1270
1271
1272 /**
1273 * wpa_supplicant_req_sched_scan - Start a periodic scheduled scan
1274 * @wpa_s: Pointer to wpa_supplicant data
1275 * Returns: 0 is sched_scan was started or -1 otherwise
1276 *
1277 * This function is used to schedule periodic scans for neighboring
1278 * access points repeating the scan continuously.
1279 */
1280 int wpa_supplicant_req_sched_scan(struct wpa_supplicant *wpa_s)
1281 {
1282 struct wpa_driver_scan_params params;
1283 struct wpa_driver_scan_params *scan_params;
1284 enum wpa_states prev_state;
1285 struct wpa_ssid *ssid = NULL;
1286 struct wpabuf *extra_ie = NULL;
1287 int ret;
1288 unsigned int max_sched_scan_ssids;
1289 int wildcard = 0;
1290 int need_ssids;
1291 struct sched_scan_plan scan_plan;
1292
1293 if (!wpa_s->sched_scan_supported)
1294 return -1;
1295
1296 if (wpa_s->max_sched_scan_ssids > WPAS_MAX_SCAN_SSIDS)
1297 max_sched_scan_ssids = WPAS_MAX_SCAN_SSIDS;
1298 else
1299 max_sched_scan_ssids = wpa_s->max_sched_scan_ssids;
1300 if (max_sched_scan_ssids < 1 || wpa_s->conf->disable_scan_offload)
1301 return -1;
1302
1303 wpa_s->sched_scan_stop_req = 0;
1304
1305 if (wpa_s->sched_scanning) {
1306 wpa_dbg(wpa_s, MSG_DEBUG, "Already sched scanning");
1307 return 0;
1308 }
1309
1310 need_ssids = 0;
1311 for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
1312 if (!wpas_network_disabled(wpa_s, ssid) && !ssid->scan_ssid) {
1313 /* Use wildcard SSID to find this network */
1314 wildcard = 1;
1315 } else if (!wpas_network_disabled(wpa_s, ssid) &&
1316 ssid->ssid_len)
1317 need_ssids++;
1318
1319 #ifdef CONFIG_WPS
1320 if (!wpas_network_disabled(wpa_s, ssid) &&
1321 ssid->key_mgmt == WPA_KEY_MGMT_WPS) {
1322 /*
1323 * Normal scan is more reliable and faster for WPS
1324 * operations and since these are for short periods of
1325 * time, the benefit of trying to use sched_scan would
1326 * be limited.
1327 */
1328 wpa_dbg(wpa_s, MSG_DEBUG, "Use normal scan instead of "
1329 "sched_scan for WPS");
1330 return -1;
1331 }
1332 #endif /* CONFIG_WPS */
1333 }
1334 if (wildcard)
1335 need_ssids++;
1336
1337 if (wpa_s->normal_scans < 3 &&
1338 (need_ssids <= wpa_s->max_scan_ssids ||
1339 wpa_s->max_scan_ssids >= (int) max_sched_scan_ssids)) {
1340 /*
1341 * When normal scan can speed up operations, use that for the
1342 * first operations before starting the sched_scan to allow
1343 * user space sleep more. We do this only if the normal scan
1344 * has functionality that is suitable for this or if the
1345 * sched_scan does not have better support for multiple SSIDs.
1346 */
1347 wpa_dbg(wpa_s, MSG_DEBUG, "Use normal scan instead of "
1348 "sched_scan for initial scans (normal_scans=%d)",
1349 wpa_s->normal_scans);
1350 return -1;
1351 }
1352
1353 os_memset(&params, 0, sizeof(params));
1354
1355 /* If we can't allocate space for the filters, we just don't filter */
1356 params.filter_ssids = os_calloc(wpa_s->max_match_sets,
1357 sizeof(struct wpa_driver_scan_filter));
1358
1359 prev_state = wpa_s->wpa_state;
1360 if (wpa_s->wpa_state == WPA_DISCONNECTED ||
1361 wpa_s->wpa_state == WPA_INACTIVE)
1362 wpa_supplicant_set_state(wpa_s, WPA_SCANNING);
1363
1364 if (wpa_s->autoscan_params != NULL) {
1365 scan_params = wpa_s->autoscan_params;
1366 goto scan;
1367 }
1368
1369 /* Find the starting point from which to continue scanning */
1370 ssid = wpa_s->conf->ssid;
1371 if (wpa_s->prev_sched_ssid) {
1372 while (ssid) {
1373 if (ssid == wpa_s->prev_sched_ssid) {
1374 ssid = ssid->next;
1375 break;
1376 }
1377 ssid = ssid->next;
1378 }
1379 }
1380
1381 if (!ssid || !wpa_s->prev_sched_ssid) {
1382 wpa_dbg(wpa_s, MSG_DEBUG, "Beginning of SSID list");
1383 wpa_s->sched_scan_timeout = max_sched_scan_ssids * 2;
1384 wpa_s->first_sched_scan = 1;
1385 ssid = wpa_s->conf->ssid;
1386 wpa_s->prev_sched_ssid = ssid;
1387 }
1388
1389 if (wildcard) {
1390 wpa_dbg(wpa_s, MSG_DEBUG, "Add wildcard SSID to sched_scan");
1391 params.num_ssids++;
1392 }
1393
1394 while (ssid) {
1395 if (wpas_network_disabled(wpa_s, ssid))
1396 goto next;
1397
1398 if (params.num_filter_ssids < wpa_s->max_match_sets &&
1399 params.filter_ssids && ssid->ssid && ssid->ssid_len) {
1400 wpa_dbg(wpa_s, MSG_DEBUG, "add to filter ssid: %s",
1401 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
1402 os_memcpy(params.filter_ssids[params.num_filter_ssids].ssid,
1403 ssid->ssid, ssid->ssid_len);
1404 params.filter_ssids[params.num_filter_ssids].ssid_len =
1405 ssid->ssid_len;
1406 params.num_filter_ssids++;
1407 } else if (params.filter_ssids && ssid->ssid && ssid->ssid_len)
1408 {
1409 wpa_dbg(wpa_s, MSG_DEBUG, "Not enough room for SSID "
1410 "filter for sched_scan - drop filter");
1411 os_free(params.filter_ssids);
1412 params.filter_ssids = NULL;
1413 params.num_filter_ssids = 0;
1414 }
1415
1416 if (ssid->scan_ssid && ssid->ssid && ssid->ssid_len) {
1417 if (params.num_ssids == max_sched_scan_ssids)
1418 break; /* only room for broadcast SSID */
1419 wpa_dbg(wpa_s, MSG_DEBUG,
1420 "add to active scan ssid: %s",
1421 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
1422 params.ssids[params.num_ssids].ssid =
1423 ssid->ssid;
1424 params.ssids[params.num_ssids].ssid_len =
1425 ssid->ssid_len;
1426 params.num_ssids++;
1427 if (params.num_ssids >= max_sched_scan_ssids) {
1428 wpa_s->prev_sched_ssid = ssid;
1429 do {
1430 ssid = ssid->next;
1431 } while (ssid &&
1432 (wpas_network_disabled(wpa_s, ssid) ||
1433 !ssid->scan_ssid));
1434 break;
1435 }
1436 }
1437
1438 next:
1439 wpa_s->prev_sched_ssid = ssid;
1440 ssid = ssid->next;
1441 }
1442
1443 if (params.num_filter_ssids == 0) {
1444 os_free(params.filter_ssids);
1445 params.filter_ssids = NULL;
1446 }
1447
1448 extra_ie = wpa_supplicant_extra_ies(wpa_s);
1449 if (extra_ie) {
1450 params.extra_ies = wpabuf_head(extra_ie);
1451 params.extra_ies_len = wpabuf_len(extra_ie);
1452 }
1453
1454 if (wpa_s->conf->filter_rssi)
1455 params.filter_rssi = wpa_s->conf->filter_rssi;
1456
1457 /* See if user specified frequencies. If so, scan only those. */
1458 if (wpa_s->conf->freq_list && !params.freqs) {
1459 wpa_dbg(wpa_s, MSG_DEBUG,
1460 "Optimize scan based on conf->freq_list");
1461 int_array_concat(&params.freqs, wpa_s->conf->freq_list);
1462 }
1463
1464 scan_params = &params;
1465
1466 scan:
1467 wpa_s->sched_scan_timed_out = 0;
1468
1469 /*
1470 * We cannot support multiple scan plans if the scan request includes
1471 * too many SSID's, so in this case use only the last scan plan and make
1472 * it run infinitely. It will be stopped by the timeout.
1473 */
1474 if (wpa_s->sched_scan_plans_num == 1 ||
1475 (wpa_s->sched_scan_plans_num && !ssid && wpa_s->first_sched_scan)) {
1476 params.sched_scan_plans = wpa_s->sched_scan_plans;
1477 params.sched_scan_plans_num = wpa_s->sched_scan_plans_num;
1478 } else if (wpa_s->sched_scan_plans_num > 1) {
1479 wpa_dbg(wpa_s, MSG_DEBUG,
1480 "Too many SSIDs. Default to using single scheduled_scan plan");
1481 params.sched_scan_plans =
1482 &wpa_s->sched_scan_plans[wpa_s->sched_scan_plans_num -
1483 1];
1484 params.sched_scan_plans_num = 1;
1485 } else {
1486 if (wpa_s->conf->sched_scan_interval)
1487 scan_plan.interval = wpa_s->conf->sched_scan_interval;
1488 else
1489 scan_plan.interval = 10;
1490
1491 if (scan_plan.interval > wpa_s->max_sched_scan_plan_interval) {
1492 wpa_printf(MSG_WARNING,
1493 "Scan interval too long(%u), use the maximum allowed(%u)",
1494 scan_plan.interval,
1495 wpa_s->max_sched_scan_plan_interval);
1496 scan_plan.interval =
1497 wpa_s->max_sched_scan_plan_interval;
1498 }
1499
1500 scan_plan.iterations = 0;
1501 params.sched_scan_plans = &scan_plan;
1502 params.sched_scan_plans_num = 1;
1503 }
1504
1505 if (ssid || !wpa_s->first_sched_scan) {
1506 wpa_dbg(wpa_s, MSG_DEBUG,
1507 "Starting sched scan: interval %u timeout %d",
1508 params.sched_scan_plans[0].interval,
1509 wpa_s->sched_scan_timeout);
1510 } else {
1511 wpa_dbg(wpa_s, MSG_DEBUG, "Starting sched scan (no timeout)");
1512 }
1513
1514 wpa_setband_scan_freqs(wpa_s, scan_params);
1515
1516 if ((wpa_s->mac_addr_rand_enable & MAC_ADDR_RAND_SCHED_SCAN) &&
1517 wpa_s->wpa_state <= WPA_SCANNING) {
1518 params.mac_addr_rand = 1;
1519 if (wpa_s->mac_addr_sched_scan) {
1520 params.mac_addr = wpa_s->mac_addr_sched_scan;
1521 params.mac_addr_mask = wpa_s->mac_addr_sched_scan +
1522 ETH_ALEN;
1523 }
1524 }
1525
1526 wpa_scan_set_relative_rssi_params(wpa_s, scan_params);
1527
1528 ret = wpa_supplicant_start_sched_scan(wpa_s, scan_params);
1529 wpabuf_free(extra_ie);
1530 os_free(params.filter_ssids);
1531 if (ret) {
1532 wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate sched scan");
1533 if (prev_state != wpa_s->wpa_state)
1534 wpa_supplicant_set_state(wpa_s, prev_state);
1535 return ret;
1536 }
1537
1538 /* If we have more SSIDs to scan, add a timeout so we scan them too */
1539 if (ssid || !wpa_s->first_sched_scan) {
1540 wpa_s->sched_scan_timed_out = 0;
1541 eloop_register_timeout(wpa_s->sched_scan_timeout, 0,
1542 wpa_supplicant_sched_scan_timeout,
1543 wpa_s, NULL);
1544 wpa_s->first_sched_scan = 0;
1545 wpa_s->sched_scan_timeout /= 2;
1546 params.sched_scan_plans[0].interval *= 2;
1547 if ((unsigned int) wpa_s->sched_scan_timeout <
1548 params.sched_scan_plans[0].interval ||
1549 params.sched_scan_plans[0].interval >
1550 wpa_s->max_sched_scan_plan_interval) {
1551 params.sched_scan_plans[0].interval = 10;
1552 wpa_s->sched_scan_timeout = max_sched_scan_ssids * 2;
1553 }
1554 }
1555
1556 /* If there is no more ssids, start next time from the beginning */
1557 if (!ssid)
1558 wpa_s->prev_sched_ssid = NULL;
1559
1560 return 0;
1561 }
1562
1563
1564 /**
1565 * wpa_supplicant_cancel_scan - Cancel a scheduled scan request
1566 * @wpa_s: Pointer to wpa_supplicant data
1567 *
1568 * This function is used to cancel a scan request scheduled with
1569 * wpa_supplicant_req_scan().
1570 */
1571 void wpa_supplicant_cancel_scan(struct wpa_supplicant *wpa_s)
1572 {
1573 wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling scan request");
1574 eloop_cancel_timeout(wpa_supplicant_scan, wpa_s, NULL);
1575 }
1576
1577
1578 /**
1579 * wpa_supplicant_cancel_delayed_sched_scan - Stop a delayed scheduled scan
1580 * @wpa_s: Pointer to wpa_supplicant data
1581 *
1582 * This function is used to stop a delayed scheduled scan.
1583 */
1584 void wpa_supplicant_cancel_delayed_sched_scan(struct wpa_supplicant *wpa_s)
1585 {
1586 if (!wpa_s->sched_scan_supported)
1587 return;
1588
1589 wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling delayed sched scan");
1590 eloop_cancel_timeout(wpa_supplicant_delayed_sched_scan_timeout,
1591 wpa_s, NULL);
1592 }
1593
1594
1595 /**
1596 * wpa_supplicant_cancel_sched_scan - Stop running scheduled scans
1597 * @wpa_s: Pointer to wpa_supplicant data
1598 *
1599 * This function is used to stop a periodic scheduled scan.
1600 */
1601 void wpa_supplicant_cancel_sched_scan(struct wpa_supplicant *wpa_s)
1602 {
1603 if (!wpa_s->sched_scanning)
1604 return;
1605
1606 if (wpa_s->sched_scanning)
1607 wpa_s->sched_scan_stop_req = 1;
1608
1609 wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling sched scan");
1610 eloop_cancel_timeout(wpa_supplicant_sched_scan_timeout, wpa_s, NULL);
1611 wpa_supplicant_stop_sched_scan(wpa_s);
1612 }
1613
1614
1615 /**
1616 * wpa_supplicant_notify_scanning - Indicate possible scan state change
1617 * @wpa_s: Pointer to wpa_supplicant data
1618 * @scanning: Whether scanning is currently in progress
1619 *
1620 * This function is to generate scanning notifycations. It is called whenever
1621 * there may have been a change in scanning (scan started, completed, stopped).
1622 * wpas_notify_scanning() is called whenever the scanning state changed from the
1623 * previously notified state.
1624 */
1625 void wpa_supplicant_notify_scanning(struct wpa_supplicant *wpa_s,
1626 int scanning)
1627 {
1628 if (wpa_s->scanning != scanning) {
1629 wpa_s->scanning = scanning;
1630 wpas_notify_scanning(wpa_s);
1631 }
1632 }
1633
1634
1635 static int wpa_scan_get_max_rate(const struct wpa_scan_res *res)
1636 {
1637 int rate = 0;
1638 const u8 *ie;
1639 int i;
1640
1641 ie = wpa_scan_get_ie(res, WLAN_EID_SUPP_RATES);
1642 for (i = 0; ie && i < ie[1]; i++) {
1643 if ((ie[i + 2] & 0x7f) > rate)
1644 rate = ie[i + 2] & 0x7f;
1645 }
1646
1647 ie = wpa_scan_get_ie(res, WLAN_EID_EXT_SUPP_RATES);
1648 for (i = 0; ie && i < ie[1]; i++) {
1649 if ((ie[i + 2] & 0x7f) > rate)
1650 rate = ie[i + 2] & 0x7f;
1651 }
1652
1653 return rate;
1654 }
1655
1656
1657 /**
1658 * wpa_scan_get_ie - Fetch a specified information element from a scan result
1659 * @res: Scan result entry
1660 * @ie: Information element identitifier (WLAN_EID_*)
1661 * Returns: Pointer to the information element (id field) or %NULL if not found
1662 *
1663 * This function returns the first matching information element in the scan
1664 * result.
1665 */
1666 const u8 * wpa_scan_get_ie(const struct wpa_scan_res *res, u8 ie)
1667 {
1668 size_t ie_len = res->ie_len;
1669
1670 /* Use the Beacon frame IEs if res->ie_len is not available */
1671 if (!ie_len)
1672 ie_len = res->beacon_ie_len;
1673
1674 return get_ie((const u8 *) (res + 1), ie_len, ie);
1675 }
1676
1677
1678 /**
1679 * wpa_scan_get_vendor_ie - Fetch vendor information element from a scan result
1680 * @res: Scan result entry
1681 * @vendor_type: Vendor type (four octets starting the IE payload)
1682 * Returns: Pointer to the information element (id field) or %NULL if not found
1683 *
1684 * This function returns the first matching information element in the scan
1685 * result.
1686 */
1687 const u8 * wpa_scan_get_vendor_ie(const struct wpa_scan_res *res,
1688 u32 vendor_type)
1689 {
1690 const u8 *end, *pos;
1691
1692 pos = (const u8 *) (res + 1);
1693 end = pos + res->ie_len;
1694
1695 while (end - pos > 1) {
1696 if (2 + pos[1] > end - pos)
1697 break;
1698 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1699 vendor_type == WPA_GET_BE32(&pos[2]))
1700 return pos;
1701 pos += 2 + pos[1];
1702 }
1703
1704 return NULL;
1705 }
1706
1707
1708 /**
1709 * wpa_scan_get_vendor_ie_beacon - Fetch vendor information from a scan result
1710 * @res: Scan result entry
1711 * @vendor_type: Vendor type (four octets starting the IE payload)
1712 * Returns: Pointer to the information element (id field) or %NULL if not found
1713 *
1714 * This function returns the first matching information element in the scan
1715 * result.
1716 *
1717 * This function is like wpa_scan_get_vendor_ie(), but uses IE buffer only
1718 * from Beacon frames instead of either Beacon or Probe Response frames.
1719 */
1720 const u8 * wpa_scan_get_vendor_ie_beacon(const struct wpa_scan_res *res,
1721 u32 vendor_type)
1722 {
1723 const u8 *end, *pos;
1724
1725 if (res->beacon_ie_len == 0)
1726 return NULL;
1727
1728 pos = (const u8 *) (res + 1);
1729 pos += res->ie_len;
1730 end = pos + res->beacon_ie_len;
1731
1732 while (end - pos > 1) {
1733 if (2 + pos[1] > end - pos)
1734 break;
1735 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1736 vendor_type == WPA_GET_BE32(&pos[2]))
1737 return pos;
1738 pos += 2 + pos[1];
1739 }
1740
1741 return NULL;
1742 }
1743
1744
1745 /**
1746 * wpa_scan_get_vendor_ie_multi - Fetch vendor IE data from a scan result
1747 * @res: Scan result entry
1748 * @vendor_type: Vendor type (four octets starting the IE payload)
1749 * Returns: Pointer to the information element payload or %NULL if not found
1750 *
1751 * This function returns concatenated payload of possibly fragmented vendor
1752 * specific information elements in the scan result. The caller is responsible
1753 * for freeing the returned buffer.
1754 */
1755 struct wpabuf * wpa_scan_get_vendor_ie_multi(const struct wpa_scan_res *res,
1756 u32 vendor_type)
1757 {
1758 struct wpabuf *buf;
1759 const u8 *end, *pos;
1760
1761 buf = wpabuf_alloc(res->ie_len);
1762 if (buf == NULL)
1763 return NULL;
1764
1765 pos = (const u8 *) (res + 1);
1766 end = pos + res->ie_len;
1767
1768 while (end - pos > 1) {
1769 if (2 + pos[1] > end - pos)
1770 break;
1771 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1772 vendor_type == WPA_GET_BE32(&pos[2]))
1773 wpabuf_put_data(buf, pos + 2 + 4, pos[1] - 4);
1774 pos += 2 + pos[1];
1775 }
1776
1777 if (wpabuf_len(buf) == 0) {
1778 wpabuf_free(buf);
1779 buf = NULL;
1780 }
1781
1782 return buf;
1783 }
1784
1785
1786 /*
1787 * Channels with a great SNR can operate at full rate. What is a great SNR?
1788 * This doc https://supportforums.cisco.com/docs/DOC-12954 says, "the general
1789 * rule of thumb is that any SNR above 20 is good." This one
1790 * http://www.cisco.com/en/US/tech/tk722/tk809/technologies_q_and_a_item09186a00805e9a96.shtml#qa23
1791 * recommends 25 as a minimum SNR for 54 Mbps data rate. 30 is chosen here as a
1792 * conservative value.
1793 */
1794 #define GREAT_SNR 30
1795
1796 #define IS_5GHZ(n) (n > 4000)
1797
1798 /* Compare function for sorting scan results. Return >0 if @b is considered
1799 * better. */
1800 static int wpa_scan_result_compar(const void *a, const void *b)
1801 {
1802 #define MIN(a,b) a < b ? a : b
1803 struct wpa_scan_res **_wa = (void *) a;
1804 struct wpa_scan_res **_wb = (void *) b;
1805 struct wpa_scan_res *wa = *_wa;
1806 struct wpa_scan_res *wb = *_wb;
1807 int wpa_a, wpa_b;
1808 int snr_a, snr_b, snr_a_full, snr_b_full;
1809
1810 /* WPA/WPA2 support preferred */
1811 wpa_a = wpa_scan_get_vendor_ie(wa, WPA_IE_VENDOR_TYPE) != NULL ||
1812 wpa_scan_get_ie(wa, WLAN_EID_RSN) != NULL;
1813 wpa_b = wpa_scan_get_vendor_ie(wb, WPA_IE_VENDOR_TYPE) != NULL ||
1814 wpa_scan_get_ie(wb, WLAN_EID_RSN) != NULL;
1815
1816 if (wpa_b && !wpa_a)
1817 return 1;
1818 if (!wpa_b && wpa_a)
1819 return -1;
1820
1821 /* privacy support preferred */
1822 if ((wa->caps & IEEE80211_CAP_PRIVACY) == 0 &&
1823 (wb->caps & IEEE80211_CAP_PRIVACY))
1824 return 1;
1825 if ((wa->caps & IEEE80211_CAP_PRIVACY) &&
1826 (wb->caps & IEEE80211_CAP_PRIVACY) == 0)
1827 return -1;
1828
1829 if (wa->flags & wb->flags & WPA_SCAN_LEVEL_DBM) {
1830 snr_a_full = wa->snr;
1831 snr_a = MIN(wa->snr, GREAT_SNR);
1832 snr_b_full = wb->snr;
1833 snr_b = MIN(wb->snr, GREAT_SNR);
1834 } else {
1835 /* Level is not in dBm, so we can't calculate
1836 * SNR. Just use raw level (units unknown). */
1837 snr_a = snr_a_full = wa->level;
1838 snr_b = snr_b_full = wb->level;
1839 }
1840
1841 /* if SNR is close, decide by max rate or frequency band */
1842 if ((snr_a && snr_b && abs(snr_b - snr_a) < 5) ||
1843 (wa->qual && wb->qual && abs(wb->qual - wa->qual) < 10)) {
1844 if (wa->est_throughput != wb->est_throughput)
1845 return wb->est_throughput - wa->est_throughput;
1846 if (IS_5GHZ(wa->freq) ^ IS_5GHZ(wb->freq))
1847 return IS_5GHZ(wa->freq) ? -1 : 1;
1848 }
1849
1850 /* all things being equal, use SNR; if SNRs are
1851 * identical, use quality values since some drivers may only report
1852 * that value and leave the signal level zero */
1853 if (snr_b_full == snr_a_full)
1854 return wb->qual - wa->qual;
1855 return snr_b_full - snr_a_full;
1856 #undef MIN
1857 }
1858
1859
1860 #ifdef CONFIG_WPS
1861 /* Compare function for sorting scan results when searching a WPS AP for
1862 * provisioning. Return >0 if @b is considered better. */
1863 static int wpa_scan_result_wps_compar(const void *a, const void *b)
1864 {
1865 struct wpa_scan_res **_wa = (void *) a;
1866 struct wpa_scan_res **_wb = (void *) b;
1867 struct wpa_scan_res *wa = *_wa;
1868 struct wpa_scan_res *wb = *_wb;
1869 int uses_wps_a, uses_wps_b;
1870 struct wpabuf *wps_a, *wps_b;
1871 int res;
1872
1873 /* Optimization - check WPS IE existence before allocated memory and
1874 * doing full reassembly. */
1875 uses_wps_a = wpa_scan_get_vendor_ie(wa, WPS_IE_VENDOR_TYPE) != NULL;
1876 uses_wps_b = wpa_scan_get_vendor_ie(wb, WPS_IE_VENDOR_TYPE) != NULL;
1877 if (uses_wps_a && !uses_wps_b)
1878 return -1;
1879 if (!uses_wps_a && uses_wps_b)
1880 return 1;
1881
1882 if (uses_wps_a && uses_wps_b) {
1883 wps_a = wpa_scan_get_vendor_ie_multi(wa, WPS_IE_VENDOR_TYPE);
1884 wps_b = wpa_scan_get_vendor_ie_multi(wb, WPS_IE_VENDOR_TYPE);
1885 res = wps_ap_priority_compar(wps_a, wps_b);
1886 wpabuf_free(wps_a);
1887 wpabuf_free(wps_b);
1888 if (res)
1889 return res;
1890 }
1891
1892 /*
1893 * Do not use current AP security policy as a sorting criteria during
1894 * WPS provisioning step since the AP may get reconfigured at the
1895 * completion of provisioning.
1896 */
1897
1898 /* all things being equal, use signal level; if signal levels are
1899 * identical, use quality values since some drivers may only report
1900 * that value and leave the signal level zero */
1901 if (wb->level == wa->level)
1902 return wb->qual - wa->qual;
1903 return wb->level - wa->level;
1904 }
1905 #endif /* CONFIG_WPS */
1906
1907
1908 static void dump_scan_res(struct wpa_scan_results *scan_res)
1909 {
1910 #ifndef CONFIG_NO_STDOUT_DEBUG
1911 size_t i;
1912
1913 if (scan_res->res == NULL || scan_res->num == 0)
1914 return;
1915
1916 wpa_printf(MSG_EXCESSIVE, "Sorted scan results");
1917
1918 for (i = 0; i < scan_res->num; i++) {
1919 struct wpa_scan_res *r = scan_res->res[i];
1920 u8 *pos;
1921 if (r->flags & WPA_SCAN_LEVEL_DBM) {
1922 int noise_valid = !(r->flags & WPA_SCAN_NOISE_INVALID);
1923
1924 wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d "
1925 "noise=%d%s level=%d snr=%d%s flags=0x%x age=%u est=%u",
1926 MAC2STR(r->bssid), r->freq, r->qual,
1927 r->noise, noise_valid ? "" : "~", r->level,
1928 r->snr, r->snr >= GREAT_SNR ? "*" : "",
1929 r->flags,
1930 r->age, r->est_throughput);
1931 } else {
1932 wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d "
1933 "noise=%d level=%d flags=0x%x age=%u est=%u",
1934 MAC2STR(r->bssid), r->freq, r->qual,
1935 r->noise, r->level, r->flags, r->age,
1936 r->est_throughput);
1937 }
1938 pos = (u8 *) (r + 1);
1939 if (r->ie_len)
1940 wpa_hexdump(MSG_EXCESSIVE, "IEs", pos, r->ie_len);
1941 pos += r->ie_len;
1942 if (r->beacon_ie_len)
1943 wpa_hexdump(MSG_EXCESSIVE, "Beacon IEs",
1944 pos, r->beacon_ie_len);
1945 }
1946 #endif /* CONFIG_NO_STDOUT_DEBUG */
1947 }
1948
1949
1950 /**
1951 * wpa_supplicant_filter_bssid_match - Is the specified BSSID allowed
1952 * @wpa_s: Pointer to wpa_supplicant data
1953 * @bssid: BSSID to check
1954 * Returns: 0 if the BSSID is filtered or 1 if not
1955 *
1956 * This function is used to filter out specific BSSIDs from scan reslts mainly
1957 * for testing purposes (SET bssid_filter ctrl_iface command).
1958 */
1959 int wpa_supplicant_filter_bssid_match(struct wpa_supplicant *wpa_s,
1960 const u8 *bssid)
1961 {
1962 size_t i;
1963
1964 if (wpa_s->bssid_filter == NULL)
1965 return 1;
1966
1967 for (i = 0; i < wpa_s->bssid_filter_count; i++) {
1968 if (os_memcmp(wpa_s->bssid_filter + i * ETH_ALEN, bssid,
1969 ETH_ALEN) == 0)
1970 return 1;
1971 }
1972
1973 return 0;
1974 }
1975
1976
1977 void filter_scan_res(struct wpa_supplicant *wpa_s,
1978 struct wpa_scan_results *res)
1979 {
1980 size_t i, j;
1981
1982 if (wpa_s->bssid_filter == NULL)
1983 return;
1984
1985 for (i = 0, j = 0; i < res->num; i++) {
1986 if (wpa_supplicant_filter_bssid_match(wpa_s,
1987 res->res[i]->bssid)) {
1988 res->res[j++] = res->res[i];
1989 } else {
1990 os_free(res->res[i]);
1991 res->res[i] = NULL;
1992 }
1993 }
1994
1995 if (res->num != j) {
1996 wpa_printf(MSG_DEBUG, "Filtered out %d scan results",
1997 (int) (res->num - j));
1998 res->num = j;
1999 }
2000 }
2001
2002
2003 /*
2004 * Noise floor values to use when we have signal strength
2005 * measurements, but no noise floor measurements. These values were
2006 * measured in an office environment with many APs.
2007 */
2008 #define DEFAULT_NOISE_FLOOR_2GHZ (-89)
2009 #define DEFAULT_NOISE_FLOOR_5GHZ (-92)
2010
2011 void scan_snr(struct wpa_scan_res *res)
2012 {
2013 if (res->flags & WPA_SCAN_NOISE_INVALID) {
2014 res->noise = IS_5GHZ(res->freq) ?
2015 DEFAULT_NOISE_FLOOR_5GHZ :
2016 DEFAULT_NOISE_FLOOR_2GHZ;
2017 }
2018
2019 if (res->flags & WPA_SCAN_LEVEL_DBM) {
2020 res->snr = res->level - res->noise;
2021 } else {
2022 /* Level is not in dBm, so we can't calculate
2023 * SNR. Just use raw level (units unknown). */
2024 res->snr = res->level;
2025 }
2026 }
2027
2028
2029 static unsigned int max_ht20_rate(int snr)
2030 {
2031 if (snr < 6)
2032 return 6500; /* HT20 MCS0 */
2033 if (snr < 8)
2034 return 13000; /* HT20 MCS1 */
2035 if (snr < 13)
2036 return 19500; /* HT20 MCS2 */
2037 if (snr < 17)
2038 return 26000; /* HT20 MCS3 */
2039 if (snr < 20)
2040 return 39000; /* HT20 MCS4 */
2041 if (snr < 23)
2042 return 52000; /* HT20 MCS5 */
2043 if (snr < 24)
2044 return 58500; /* HT20 MCS6 */
2045 return 65000; /* HT20 MCS7 */
2046 }
2047
2048
2049 static unsigned int max_ht40_rate(int snr)
2050 {
2051 if (snr < 3)
2052 return 13500; /* HT40 MCS0 */
2053 if (snr < 6)
2054 return 27000; /* HT40 MCS1 */
2055 if (snr < 10)
2056 return 40500; /* HT40 MCS2 */
2057 if (snr < 15)
2058 return 54000; /* HT40 MCS3 */
2059 if (snr < 17)
2060 return 81000; /* HT40 MCS4 */
2061 if (snr < 22)
2062 return 108000; /* HT40 MCS5 */
2063 if (snr < 24)
2064 return 121500; /* HT40 MCS6 */
2065 return 135000; /* HT40 MCS7 */
2066 }
2067
2068
2069 static unsigned int max_vht80_rate(int snr)
2070 {
2071 if (snr < 1)
2072 return 0;
2073 if (snr < 2)
2074 return 29300; /* VHT80 MCS0 */
2075 if (snr < 5)
2076 return 58500; /* VHT80 MCS1 */
2077 if (snr < 9)
2078 return 87800; /* VHT80 MCS2 */
2079 if (snr < 11)
2080 return 117000; /* VHT80 MCS3 */
2081 if (snr < 15)
2082 return 175500; /* VHT80 MCS4 */
2083 if (snr < 16)
2084 return 234000; /* VHT80 MCS5 */
2085 if (snr < 18)
2086 return 263300; /* VHT80 MCS6 */
2087 if (snr < 20)
2088 return 292500; /* VHT80 MCS7 */
2089 if (snr < 22)
2090 return 351000; /* VHT80 MCS8 */
2091 return 390000; /* VHT80 MCS9 */
2092 }
2093
2094
2095 void scan_est_throughput(struct wpa_supplicant *wpa_s,
2096 struct wpa_scan_res *res)
2097 {
2098 enum local_hw_capab capab = wpa_s->hw_capab;
2099 int rate; /* max legacy rate in 500 kb/s units */
2100 const u8 *ie;
2101 unsigned int est, tmp;
2102 int snr = res->snr;
2103
2104 if (res->est_throughput)
2105 return;
2106
2107 /* Get maximum legacy rate */
2108 rate = wpa_scan_get_max_rate(res);
2109
2110 /* Limit based on estimated SNR */
2111 if (rate > 1 * 2 && snr < 1)
2112 rate = 1 * 2;
2113 else if (rate > 2 * 2 && snr < 4)
2114 rate = 2 * 2;
2115 else if (rate > 6 * 2 && snr < 5)
2116 rate = 6 * 2;
2117 else if (rate > 9 * 2 && snr < 6)
2118 rate = 9 * 2;
2119 else if (rate > 12 * 2 && snr < 7)
2120 rate = 12 * 2;
2121 else if (rate > 18 * 2 && snr < 10)
2122 rate = 18 * 2;
2123 else if (rate > 24 * 2 && snr < 11)
2124 rate = 24 * 2;
2125 else if (rate > 36 * 2 && snr < 15)
2126 rate = 36 * 2;
2127 else if (rate > 48 * 2 && snr < 19)
2128 rate = 48 * 2;
2129 else if (rate > 54 * 2 && snr < 21)
2130 rate = 54 * 2;
2131 est = rate * 500;
2132
2133 if (capab == CAPAB_HT || capab == CAPAB_HT40 || capab == CAPAB_VHT) {
2134 ie = wpa_scan_get_ie(res, WLAN_EID_HT_CAP);
2135 if (ie) {
2136 tmp = max_ht20_rate(snr);
2137 if (tmp > est)
2138 est = tmp;
2139 }
2140 }
2141
2142 if (capab == CAPAB_HT40 || capab == CAPAB_VHT) {
2143 ie = wpa_scan_get_ie(res, WLAN_EID_HT_OPERATION);
2144 if (ie && ie[1] >= 2 &&
2145 (ie[3] & HT_INFO_HT_PARAM_SECONDARY_CHNL_OFF_MASK)) {
2146 tmp = max_ht40_rate(snr);
2147 if (tmp > est)
2148 est = tmp;
2149 }
2150 }
2151
2152 if (capab == CAPAB_VHT) {
2153 /* Use +1 to assume VHT is always faster than HT */
2154 ie = wpa_scan_get_ie(res, WLAN_EID_VHT_CAP);
2155 if (ie) {
2156 tmp = max_ht20_rate(snr) + 1;
2157 if (tmp > est)
2158 est = tmp;
2159
2160 ie = wpa_scan_get_ie(res, WLAN_EID_HT_OPERATION);
2161 if (ie && ie[1] >= 2 &&
2162 (ie[3] &
2163 HT_INFO_HT_PARAM_SECONDARY_CHNL_OFF_MASK)) {
2164 tmp = max_ht40_rate(snr) + 1;
2165 if (tmp > est)
2166 est = tmp;
2167 }
2168
2169 ie = wpa_scan_get_ie(res, WLAN_EID_VHT_OPERATION);
2170 if (ie && ie[1] >= 1 &&
2171 (ie[2] & VHT_OPMODE_CHANNEL_WIDTH_MASK)) {
2172 tmp = max_vht80_rate(snr) + 1;
2173 if (tmp > est)
2174 est = tmp;
2175 }
2176 }
2177 }
2178
2179 /* TODO: channel utilization and AP load (e.g., from AP Beacon) */
2180
2181 res->est_throughput = est;
2182 }
2183
2184
2185 /**
2186 * wpa_supplicant_get_scan_results - Get scan results
2187 * @wpa_s: Pointer to wpa_supplicant data
2188 * @info: Information about what was scanned or %NULL if not available
2189 * @new_scan: Whether a new scan was performed
2190 * Returns: Scan results, %NULL on failure
2191 *
2192 * This function request the current scan results from the driver and updates
2193 * the local BSS list wpa_s->bss. The caller is responsible for freeing the
2194 * results with wpa_scan_results_free().
2195 */
2196 struct wpa_scan_results *
2197 wpa_supplicant_get_scan_results(struct wpa_supplicant *wpa_s,
2198 struct scan_info *info, int new_scan)
2199 {
2200 struct wpa_scan_results *scan_res;
2201 size_t i;
2202 int (*compar)(const void *, const void *) = wpa_scan_result_compar;
2203
2204 scan_res = wpa_drv_get_scan_results2(wpa_s);
2205 if (scan_res == NULL) {
2206 wpa_dbg(wpa_s, MSG_DEBUG, "Failed to get scan results");
2207 return NULL;
2208 }
2209 if (scan_res->fetch_time.sec == 0) {
2210 /*
2211 * Make sure we have a valid timestamp if the driver wrapper
2212 * does not set this.
2213 */
2214 os_get_reltime(&scan_res->fetch_time);
2215 }
2216 filter_scan_res(wpa_s, scan_res);
2217
2218 for (i = 0; i < scan_res->num; i++) {
2219 struct wpa_scan_res *scan_res_item = scan_res->res[i];
2220
2221 scan_snr(scan_res_item);
2222 scan_est_throughput(wpa_s, scan_res_item);
2223 }
2224
2225 #ifdef CONFIG_WPS
2226 if (wpas_wps_searching(wpa_s)) {
2227 wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Order scan results with WPS "
2228 "provisioning rules");
2229 compar = wpa_scan_result_wps_compar;
2230 }
2231 #endif /* CONFIG_WPS */
2232
2233 if (scan_res->res) {
2234 qsort(scan_res->res, scan_res->num,
2235 sizeof(struct wpa_scan_res *), compar);
2236 }
2237 dump_scan_res(scan_res);
2238
2239 if (wpa_s->ignore_post_flush_scan_res) {
2240 /* FLUSH command aborted an ongoing scan and these are the
2241 * results from the aborted scan. Do not process the results to
2242 * maintain flushed state. */
2243 wpa_dbg(wpa_s, MSG_DEBUG,
2244 "Do not update BSS table based on pending post-FLUSH scan results");
2245 wpa_s->ignore_post_flush_scan_res = 0;
2246 return scan_res;
2247 }
2248
2249 wpa_bss_update_start(wpa_s);
2250 for (i = 0; i < scan_res->num; i++)
2251 wpa_bss_update_scan_res(wpa_s, scan_res->res[i],
2252 &scan_res->fetch_time);
2253 wpa_bss_update_end(wpa_s, info, new_scan);
2254
2255 return scan_res;
2256 }
2257
2258
2259 /**
2260 * wpa_supplicant_update_scan_results - Update scan results from the driver
2261 * @wpa_s: Pointer to wpa_supplicant data
2262 * Returns: 0 on success, -1 on failure
2263 *
2264 * This function updates the BSS table within wpa_supplicant based on the
2265 * currently available scan results from the driver without requesting a new
2266 * scan. This is used in cases where the driver indicates an association
2267 * (including roaming within ESS) and wpa_supplicant does not yet have the
2268 * needed information to complete the connection (e.g., to perform validation
2269 * steps in 4-way handshake).
2270 */
2271 int wpa_supplicant_update_scan_results(struct wpa_supplicant *wpa_s)
2272 {
2273 struct wpa_scan_results *scan_res;
2274 scan_res = wpa_supplicant_get_scan_results(wpa_s, NULL, 0);
2275 if (scan_res == NULL)
2276 return -1;
2277 wpa_scan_results_free(scan_res);
2278
2279 return 0;
2280 }
2281
2282
2283 /**
2284 * scan_only_handler - Reports scan results
2285 */
2286 void scan_only_handler(struct wpa_supplicant *wpa_s,
2287 struct wpa_scan_results *scan_res)
2288 {
2289 wpa_dbg(wpa_s, MSG_DEBUG, "Scan-only results received");
2290 if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
2291 wpa_s->manual_scan_use_id && wpa_s->own_scan_running) {
2292 wpa_msg_ctrl(wpa_s, MSG_INFO, WPA_EVENT_SCAN_RESULTS "id=%u",
2293 wpa_s->manual_scan_id);
2294 wpa_s->manual_scan_use_id = 0;
2295 } else {
2296 wpa_msg_ctrl(wpa_s, MSG_INFO, WPA_EVENT_SCAN_RESULTS);
2297 }
2298 wpas_notify_scan_results(wpa_s);
2299 wpas_notify_scan_done(wpa_s, 1);
2300 if (wpa_s->scan_work) {
2301 struct wpa_radio_work *work = wpa_s->scan_work;
2302 wpa_s->scan_work = NULL;
2303 radio_work_done(work);
2304 }
2305
2306 if (wpa_s->wpa_state == WPA_SCANNING)
2307 wpa_supplicant_set_state(wpa_s, wpa_s->scan_prev_wpa_state);
2308 }
2309
2310
2311 int wpas_scan_scheduled(struct wpa_supplicant *wpa_s)
2312 {
2313 return eloop_is_timeout_registered(wpa_supplicant_scan, wpa_s, NULL);
2314 }
2315
2316
2317 struct wpa_driver_scan_params *
2318 wpa_scan_clone_params(const struct wpa_driver_scan_params *src)
2319 {
2320 struct wpa_driver_scan_params *params;
2321 size_t i;
2322 u8 *n;
2323
2324 params = os_zalloc(sizeof(*params));
2325 if (params == NULL)
2326 return NULL;
2327
2328 for (i = 0; i < src->num_ssids; i++) {
2329 if (src->ssids[i].ssid) {
2330 n = os_malloc(src->ssids[i].ssid_len);
2331 if (n == NULL)
2332 goto failed;
2333 os_memcpy(n, src->ssids[i].ssid,
2334 src->ssids[i].ssid_len);
2335 params->ssids[i].ssid = n;
2336 params->ssids[i].ssid_len = src->ssids[i].ssid_len;
2337 }
2338 }
2339 params->num_ssids = src->num_ssids;
2340
2341 if (src->extra_ies) {
2342 n = os_malloc(src->extra_ies_len);
2343 if (n == NULL)
2344 goto failed;
2345 os_memcpy(n, src->extra_ies, src->extra_ies_len);
2346 params->extra_ies = n;
2347 params->extra_ies_len = src->extra_ies_len;
2348 }
2349
2350 if (src->freqs) {
2351 int len = int_array_len(src->freqs);
2352 params->freqs = os_malloc((len + 1) * sizeof(int));
2353 if (params->freqs == NULL)
2354 goto failed;
2355 os_memcpy(params->freqs, src->freqs, (len + 1) * sizeof(int));
2356 }
2357
2358 if (src->filter_ssids) {
2359 params->filter_ssids = os_malloc(sizeof(*params->filter_ssids) *
2360 src->num_filter_ssids);
2361 if (params->filter_ssids == NULL)
2362 goto failed;
2363 os_memcpy(params->filter_ssids, src->filter_ssids,
2364 sizeof(*params->filter_ssids) *
2365 src->num_filter_ssids);
2366 params->num_filter_ssids = src->num_filter_ssids;
2367 }
2368
2369 params->filter_rssi = src->filter_rssi;
2370 params->p2p_probe = src->p2p_probe;
2371 params->only_new_results = src->only_new_results;
2372 params->low_priority = src->low_priority;
2373 params->duration = src->duration;
2374 params->duration_mandatory = src->duration_mandatory;
2375
2376 if (src->sched_scan_plans_num > 0) {
2377 params->sched_scan_plans =
2378 os_malloc(sizeof(*src->sched_scan_plans) *
2379 src->sched_scan_plans_num);
2380 if (!params->sched_scan_plans)
2381 goto failed;
2382
2383 os_memcpy(params->sched_scan_plans, src->sched_scan_plans,
2384 sizeof(*src->sched_scan_plans) *
2385 src->sched_scan_plans_num);
2386 params->sched_scan_plans_num = src->sched_scan_plans_num;
2387 }
2388
2389 if (src->mac_addr_rand) {
2390 params->mac_addr_rand = src->mac_addr_rand;
2391
2392 if (src->mac_addr && src->mac_addr_mask) {
2393 u8 *mac_addr;
2394
2395 mac_addr = os_malloc(2 * ETH_ALEN);
2396 if (!mac_addr)
2397 goto failed;
2398
2399 os_memcpy(mac_addr, src->mac_addr, ETH_ALEN);
2400 os_memcpy(mac_addr + ETH_ALEN, src->mac_addr_mask,
2401 ETH_ALEN);
2402 params->mac_addr = mac_addr;
2403 params->mac_addr_mask = mac_addr + ETH_ALEN;
2404 }
2405 }
2406
2407 if (src->bssid) {
2408 u8 *bssid;
2409
2410 bssid = os_malloc(ETH_ALEN);
2411 if (!bssid)
2412 goto failed;
2413 os_memcpy(bssid, src->bssid, ETH_ALEN);
2414 params->bssid = bssid;
2415 }
2416
2417 params->relative_rssi_set = src->relative_rssi_set;
2418 params->relative_rssi = src->relative_rssi;
2419 params->relative_adjust_band = src->relative_adjust_band;
2420 params->relative_adjust_rssi = src->relative_adjust_rssi;
2421 return params;
2422
2423 failed:
2424 wpa_scan_free_params(params);
2425 return NULL;
2426 }
2427
2428
2429 void wpa_scan_free_params(struct wpa_driver_scan_params *params)
2430 {
2431 size_t i;
2432
2433 if (params == NULL)
2434 return;
2435
2436 for (i = 0; i < params->num_ssids; i++)
2437 os_free((u8 *) params->ssids[i].ssid);
2438 os_free((u8 *) params->extra_ies);
2439 os_free(params->freqs);
2440 os_free(params->filter_ssids);
2441 os_free(params->sched_scan_plans);
2442
2443 /*
2444 * Note: params->mac_addr_mask points to same memory allocation and
2445 * must not be freed separately.
2446 */
2447 os_free((u8 *) params->mac_addr);
2448
2449 os_free((u8 *) params->bssid);
2450
2451 os_free(params);
2452 }
2453
2454
2455 int wpas_start_pno(struct wpa_supplicant *wpa_s)
2456 {
2457 int ret, prio;
2458 size_t i, num_ssid, num_match_ssid;
2459 struct wpa_ssid *ssid;
2460 struct wpa_driver_scan_params params;
2461 struct sched_scan_plan scan_plan;
2462 unsigned int max_sched_scan_ssids;
2463
2464 if (!wpa_s->sched_scan_supported)
2465 return -1;
2466
2467 if (wpa_s->max_sched_scan_ssids > WPAS_MAX_SCAN_SSIDS)
2468 max_sched_scan_ssids = WPAS_MAX_SCAN_SSIDS;
2469 else
2470 max_sched_scan_ssids = wpa_s->max_sched_scan_ssids;
2471 if (max_sched_scan_ssids < 1)
2472 return -1;
2473
2474 if (wpa_s->pno || wpa_s->pno_sched_pending)
2475 return 0;
2476
2477 if ((wpa_s->wpa_state > WPA_SCANNING) &&
2478 (wpa_s->wpa_state < WPA_COMPLETED)) {
2479 wpa_printf(MSG_ERROR, "PNO: In assoc process");
2480 return -EAGAIN;
2481 }
2482
2483 if (wpa_s->wpa_state == WPA_SCANNING) {
2484 wpa_supplicant_cancel_scan(wpa_s);
2485 if (wpa_s->sched_scanning) {
2486 wpa_printf(MSG_DEBUG, "Schedule PNO on completion of "
2487 "ongoing sched scan");
2488 wpa_supplicant_cancel_sched_scan(wpa_s);
2489 wpa_s->pno_sched_pending = 1;
2490 return 0;
2491 }
2492 }
2493
2494 if (wpa_s->sched_scan_stop_req) {
2495 wpa_printf(MSG_DEBUG,
2496 "Schedule PNO after previous sched scan has stopped");
2497 wpa_s->pno_sched_pending = 1;
2498 return 0;
2499 }
2500
2501 os_memset(&params, 0, sizeof(params));
2502
2503 num_ssid = num_match_ssid = 0;
2504 ssid = wpa_s->conf->ssid;
2505 while (ssid) {
2506 if (!wpas_network_disabled(wpa_s, ssid)) {
2507 num_match_ssid++;
2508 if (ssid->scan_ssid)
2509 num_ssid++;
2510 }
2511 ssid = ssid->next;
2512 }
2513
2514 if (num_match_ssid == 0) {
2515 wpa_printf(MSG_DEBUG, "PNO: No configured SSIDs");
2516 return -1;
2517 }
2518
2519 if (num_match_ssid > num_ssid) {
2520 params.num_ssids++; /* wildcard */
2521 num_ssid++;
2522 }
2523
2524 if (num_ssid > max_sched_scan_ssids) {
2525 wpa_printf(MSG_DEBUG, "PNO: Use only the first %u SSIDs from "
2526 "%u", max_sched_scan_ssids, (unsigned int) num_ssid);
2527 num_ssid = max_sched_scan_ssids;
2528 }
2529
2530 if (num_match_ssid > wpa_s->max_match_sets) {
2531 num_match_ssid = wpa_s->max_match_sets;
2532 wpa_dbg(wpa_s, MSG_DEBUG, "PNO: Too many SSIDs to match");
2533 }
2534 params.filter_ssids = os_calloc(num_match_ssid,
2535 sizeof(struct wpa_driver_scan_filter));
2536 if (params.filter_ssids == NULL)
2537 return -1;
2538
2539 i = 0;
2540 prio = 0;
2541 ssid = wpa_s->conf->pssid[prio];
2542 while (ssid) {
2543 if (!wpas_network_disabled(wpa_s, ssid)) {
2544 if (ssid->scan_ssid && params.num_ssids < num_ssid) {
2545 params.ssids[params.num_ssids].ssid =
2546 ssid->ssid;
2547 params.ssids[params.num_ssids].ssid_len =
2548 ssid->ssid_len;
2549 params.num_ssids++;
2550 }
2551 os_memcpy(params.filter_ssids[i].ssid, ssid->ssid,
2552 ssid->ssid_len);
2553 params.filter_ssids[i].ssid_len = ssid->ssid_len;
2554 params.num_filter_ssids++;
2555 i++;
2556 if (i == num_match_ssid)
2557 break;
2558 }
2559 if (ssid->pnext)
2560 ssid = ssid->pnext;
2561 else if (prio + 1 == wpa_s->conf->num_prio)
2562 break;
2563 else
2564 ssid = wpa_s->conf->pssid[++prio];
2565 }
2566
2567 if (wpa_s->conf->filter_rssi)
2568 params.filter_rssi = wpa_s->conf->filter_rssi;
2569
2570 if (wpa_s->sched_scan_plans_num) {
2571 params.sched_scan_plans = wpa_s->sched_scan_plans;
2572 params.sched_scan_plans_num = wpa_s->sched_scan_plans_num;
2573 } else {
2574 /* Set one scan plan that will run infinitely */
2575 if (wpa_s->conf->sched_scan_interval)
2576 scan_plan.interval = wpa_s->conf->sched_scan_interval;
2577 else
2578 scan_plan.interval = 10;
2579
2580 scan_plan.iterations = 0;
2581 params.sched_scan_plans = &scan_plan;
2582 params.sched_scan_plans_num = 1;
2583 }
2584
2585 if (params.freqs == NULL && wpa_s->manual_sched_scan_freqs) {
2586 wpa_dbg(wpa_s, MSG_DEBUG, "Limit sched scan to specified channels");
2587 params.freqs = wpa_s->manual_sched_scan_freqs;
2588 }
2589
2590 if ((wpa_s->mac_addr_rand_enable & MAC_ADDR_RAND_PNO) &&
2591 wpa_s->wpa_state <= WPA_SCANNING) {
2592 params.mac_addr_rand = 1;
2593 if (wpa_s->mac_addr_pno) {
2594 params.mac_addr = wpa_s->mac_addr_pno;
2595 params.mac_addr_mask = wpa_s->mac_addr_pno + ETH_ALEN;
2596 }
2597 }
2598
2599 wpa_scan_set_relative_rssi_params(wpa_s, &params);
2600
2601 ret = wpa_supplicant_start_sched_scan(wpa_s, &params);
2602 os_free(params.filter_ssids);
2603 if (ret == 0)
2604 wpa_s->pno = 1;
2605 else
2606 wpa_msg(wpa_s, MSG_ERROR, "Failed to schedule PNO");
2607 return ret;
2608 }
2609
2610
2611 int wpas_stop_pno(struct wpa_supplicant *wpa_s)
2612 {
2613 int ret = 0;
2614
2615 if (!wpa_s->pno)
2616 return 0;
2617
2618 ret = wpa_supplicant_stop_sched_scan(wpa_s);
2619 wpa_s->sched_scan_stop_req = 1;
2620
2621 wpa_s->pno = 0;
2622 wpa_s->pno_sched_pending = 0;
2623
2624 if (wpa_s->wpa_state == WPA_SCANNING)
2625 wpa_supplicant_req_scan(wpa_s, 0, 0);
2626
2627 return ret;
2628 }
2629
2630
2631 void wpas_mac_addr_rand_scan_clear(struct wpa_supplicant *wpa_s,
2632 unsigned int type)
2633 {
2634 type &= MAC_ADDR_RAND_ALL;
2635 wpa_s->mac_addr_rand_enable &= ~type;
2636
2637 if (type & MAC_ADDR_RAND_SCAN) {
2638 os_free(wpa_s->mac_addr_scan);
2639 wpa_s->mac_addr_scan = NULL;
2640 }
2641
2642 if (type & MAC_ADDR_RAND_SCHED_SCAN) {
2643 os_free(wpa_s->mac_addr_sched_scan);
2644 wpa_s->mac_addr_sched_scan = NULL;
2645 }
2646
2647 if (type & MAC_ADDR_RAND_PNO) {
2648 os_free(wpa_s->mac_addr_pno);
2649 wpa_s->mac_addr_pno = NULL;
2650 }
2651 }
2652
2653
2654 int wpas_mac_addr_rand_scan_set(struct wpa_supplicant *wpa_s,
2655 unsigned int type, const u8 *addr,
2656 const u8 *mask)
2657 {
2658 u8 *tmp = NULL;
2659
2660 wpas_mac_addr_rand_scan_clear(wpa_s, type);
2661
2662 if (addr) {
2663 tmp = os_malloc(2 * ETH_ALEN);
2664 if (!tmp)
2665 return -1;
2666 os_memcpy(tmp, addr, ETH_ALEN);
2667 os_memcpy(tmp + ETH_ALEN, mask, ETH_ALEN);
2668 }
2669
2670 if (type == MAC_ADDR_RAND_SCAN) {
2671 wpa_s->mac_addr_scan = tmp;
2672 } else if (type == MAC_ADDR_RAND_SCHED_SCAN) {
2673 wpa_s->mac_addr_sched_scan = tmp;
2674 } else if (type == MAC_ADDR_RAND_PNO) {
2675 wpa_s->mac_addr_pno = tmp;
2676 } else {
2677 wpa_printf(MSG_INFO,
2678 "scan: Invalid MAC randomization type=0x%x",
2679 type);
2680 os_free(tmp);
2681 return -1;
2682 }
2683
2684 wpa_s->mac_addr_rand_enable |= type;
2685 return 0;
2686 }
2687
2688
2689 int wpas_abort_ongoing_scan(struct wpa_supplicant *wpa_s)
2690 {
2691 struct wpa_radio_work *work;
2692 struct wpa_radio *radio = wpa_s->radio;
2693
2694 dl_list_for_each(work, &radio->work, struct wpa_radio_work, list) {
2695 if (work->wpa_s != wpa_s || !work->started ||
2696 (os_strcmp(work->type, "scan") != 0 &&
2697 os_strcmp(work->type, "p2p-scan") != 0))
2698 continue;
2699 wpa_dbg(wpa_s, MSG_DEBUG, "Abort an ongoing scan");
2700 return wpa_drv_abort_scan(wpa_s, wpa_s->curr_scan_cookie);
2701 }
2702
2703 wpa_dbg(wpa_s, MSG_DEBUG, "No ongoing scan/p2p-scan found to abort");
2704 return -1;
2705 }
2706
2707
2708 int wpas_sched_scan_plans_set(struct wpa_supplicant *wpa_s, const char *cmd)
2709 {
2710 struct sched_scan_plan *scan_plans = NULL;
2711 const char *token, *context = NULL;
2712 unsigned int num = 0;
2713
2714 if (!cmd)
2715 return -1;
2716
2717 if (!cmd[0]) {
2718 wpa_printf(MSG_DEBUG, "Clear sched scan plans");
2719 os_free(wpa_s->sched_scan_plans);
2720 wpa_s->sched_scan_plans = NULL;
2721 wpa_s->sched_scan_plans_num = 0;
2722 return 0;
2723 }
2724
2725 while ((token = cstr_token(cmd, " ", &context))) {
2726 int ret;
2727 struct sched_scan_plan *scan_plan, *n;
2728
2729 n = os_realloc_array(scan_plans, num + 1, sizeof(*scan_plans));
2730 if (!n)
2731 goto fail;
2732
2733 scan_plans = n;
2734 scan_plan = &scan_plans[num];
2735 num++;
2736
2737 ret = sscanf(token, "%u:%u", &scan_plan->interval,
2738 &scan_plan->iterations);
2739 if (ret <= 0 || ret > 2 || !scan_plan->interval) {
2740 wpa_printf(MSG_ERROR,
2741 "Invalid sched scan plan input: %s", token);
2742 goto fail;
2743 }
2744
2745 if (scan_plan->interval > wpa_s->max_sched_scan_plan_interval) {
2746 wpa_printf(MSG_WARNING,
2747 "scan plan %u: Scan interval too long(%u), use the maximum allowed(%u)",
2748 num, scan_plan->interval,
2749 wpa_s->max_sched_scan_plan_interval);
2750 scan_plan->interval =
2751 wpa_s->max_sched_scan_plan_interval;
2752 }
2753
2754 if (ret == 1) {
2755 scan_plan->iterations = 0;
2756 break;
2757 }
2758
2759 if (!scan_plan->iterations) {
2760 wpa_printf(MSG_ERROR,
2761 "scan plan %u: Number of iterations cannot be zero",
2762 num);
2763 goto fail;
2764 }
2765
2766 if (scan_plan->iterations >
2767 wpa_s->max_sched_scan_plan_iterations) {
2768 wpa_printf(MSG_WARNING,
2769 "scan plan %u: Too many iterations(%u), use the maximum allowed(%u)",
2770 num, scan_plan->iterations,
2771 wpa_s->max_sched_scan_plan_iterations);
2772 scan_plan->iterations =
2773 wpa_s->max_sched_scan_plan_iterations;
2774 }
2775
2776 wpa_printf(MSG_DEBUG,
2777 "scan plan %u: interval=%u iterations=%u",
2778 num, scan_plan->interval, scan_plan->iterations);
2779 }
2780
2781 if (!scan_plans) {
2782 wpa_printf(MSG_ERROR, "Invalid scan plans entry");
2783 goto fail;
2784 }
2785
2786 if (cstr_token(cmd, " ", &context) || scan_plans[num - 1].iterations) {
2787 wpa_printf(MSG_ERROR,
2788 "All scan plans but the last must specify a number of iterations");
2789 goto fail;
2790 }
2791
2792 wpa_printf(MSG_DEBUG, "scan plan %u (last plan): interval=%u",
2793 num, scan_plans[num - 1].interval);
2794
2795 if (num > wpa_s->max_sched_scan_plans) {
2796 wpa_printf(MSG_WARNING,
2797 "Too many scheduled scan plans (only %u supported)",
2798 wpa_s->max_sched_scan_plans);
2799 wpa_printf(MSG_WARNING,
2800 "Use only the first %u scan plans, and the last one (in infinite loop)",
2801 wpa_s->max_sched_scan_plans - 1);
2802 os_memcpy(&scan_plans[wpa_s->max_sched_scan_plans - 1],
2803 &scan_plans[num - 1], sizeof(*scan_plans));
2804 num = wpa_s->max_sched_scan_plans;
2805 }
2806
2807 os_free(wpa_s->sched_scan_plans);
2808 wpa_s->sched_scan_plans = scan_plans;
2809 wpa_s->sched_scan_plans_num = num;
2810
2811 return 0;
2812
2813 fail:
2814 os_free(scan_plans);
2815 wpa_printf(MSG_ERROR, "invalid scan plans list");
2816 return -1;
2817 }
2818
2819
2820 /**
2821 * wpas_scan_reset_sched_scan - Reset sched_scan state
2822 * @wpa_s: Pointer to wpa_supplicant data
2823 *
2824 * This function is used to cancel a running scheduled scan and to reset an
2825 * internal scan state to continue with a regular scan on the following
2826 * wpa_supplicant_req_scan() calls.
2827 */
2828 void wpas_scan_reset_sched_scan(struct wpa_supplicant *wpa_s)
2829 {
2830 wpa_s->normal_scans = 0;
2831 if (wpa_s->sched_scanning) {
2832 wpa_s->sched_scan_timed_out = 0;
2833 wpa_s->prev_sched_ssid = NULL;
2834 wpa_supplicant_cancel_sched_scan(wpa_s);
2835 }
2836 }
2837
2838
2839 void wpas_scan_restart_sched_scan(struct wpa_supplicant *wpa_s)
2840 {
2841 /* simulate timeout to restart the sched scan */
2842 wpa_s->sched_scan_timed_out = 1;
2843 wpa_s->prev_sched_ssid = NULL;
2844 wpa_supplicant_cancel_sched_scan(wpa_s);
2845 }
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