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
26
wpa_supplicant_gen_assoc_event(struct wpa_supplicant * wpa_s)27 static void wpa_supplicant_gen_assoc_event(struct wpa_supplicant *wpa_s)
28 {
29 struct wpa_ssid *ssid;
30 union wpa_event_data data;
31
32 ssid = wpa_supplicant_get_ssid(wpa_s);
33 if (ssid == NULL)
34 return;
35
36 if (wpa_s->current_ssid == NULL) {
37 wpa_s->current_ssid = ssid;
38 if (wpa_s->current_ssid != NULL)
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
wpas_wps_in_use(struct wpa_supplicant * wpa_s,enum wps_request_type * req_type)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)
63 continue;
64
65 if (os_strstr(ssid->eap.phase1, "pbc=1"))
66 return 2;
67 }
68
69 #ifdef CONFIG_P2P
70 if (!wpa_s->global->p2p_disabled && wpa_s->global->p2p &&
71 !wpa_s->conf->p2p_disabled) {
72 wpa_s->wps->dev.p2p = 1;
73 if (!wps) {
74 wps = 1;
75 *req_type = WPS_REQ_ENROLLEE_INFO;
76 }
77 }
78 #endif /* CONFIG_P2P */
79
80 return wps;
81 }
82 #endif /* CONFIG_WPS */
83
84
85 /**
86 * wpa_supplicant_enabled_networks - Check whether there are enabled networks
87 * @wpa_s: Pointer to wpa_supplicant data
88 * Returns: 0 if no networks are enabled, >0 if networks are enabled
89 *
90 * This function is used to figure out whether any networks (or Interworking
91 * with enabled credentials and auto_interworking) are present in the current
92 * configuration.
93 */
wpa_supplicant_enabled_networks(struct wpa_supplicant * wpa_s)94 int wpa_supplicant_enabled_networks(struct wpa_supplicant *wpa_s)
95 {
96 struct wpa_ssid *ssid = wpa_s->conf->ssid;
97 int count = 0, disabled = 0;
98 while (ssid) {
99 if (!wpas_network_disabled(wpa_s, ssid))
100 count++;
101 else
102 disabled++;
103 ssid = ssid->next;
104 }
105 if (wpa_s->conf->cred && wpa_s->conf->interworking &&
106 wpa_s->conf->auto_interworking)
107 count++;
108 if (count == 0 && disabled > 0) {
109 wpa_dbg(wpa_s, MSG_DEBUG, "No enabled networks (%d disabled "
110 "networks)", disabled);
111 }
112 return count;
113 }
114
115
wpa_supplicant_assoc_try(struct wpa_supplicant * wpa_s,struct wpa_ssid * ssid)116 static void wpa_supplicant_assoc_try(struct wpa_supplicant *wpa_s,
117 struct wpa_ssid *ssid)
118 {
119 while (ssid) {
120 if (!wpas_network_disabled(wpa_s, ssid))
121 break;
122 ssid = ssid->next;
123 }
124
125 /* ap_scan=2 mode - try to associate with each SSID. */
126 if (ssid == NULL) {
127 wpa_dbg(wpa_s, MSG_DEBUG, "wpa_supplicant_assoc_try: Reached "
128 "end of scan list - go back to beginning");
129 wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
130 wpa_supplicant_req_scan(wpa_s, 0, 0);
131 return;
132 }
133 if (ssid->next) {
134 /* Continue from the next SSID on the next attempt. */
135 wpa_s->prev_scan_ssid = ssid;
136 } else {
137 /* Start from the beginning of the SSID list. */
138 wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
139 }
140 wpa_supplicant_associate(wpa_s, NULL, ssid);
141 }
142
143
wpas_trigger_scan_cb(struct wpa_radio_work * work,int deinit)144 static void wpas_trigger_scan_cb(struct wpa_radio_work *work, int deinit)
145 {
146 struct wpa_supplicant *wpa_s = work->wpa_s;
147 struct wpa_driver_scan_params *params = work->ctx;
148 int ret;
149
150 if (deinit) {
151 if (!work->started) {
152 wpa_scan_free_params(params);
153 return;
154 }
155 wpa_supplicant_notify_scanning(wpa_s, 0);
156 wpas_notify_scan_done(wpa_s, 0);
157 wpa_s->scan_work = NULL;
158 return;
159 }
160
161 if (wpas_update_random_addr_disassoc(wpa_s) < 0) {
162 wpa_msg(wpa_s, MSG_INFO,
163 "Failed to assign random MAC address for a scan");
164 radio_work_done(work);
165 return;
166 }
167
168 wpa_supplicant_notify_scanning(wpa_s, 1);
169
170 if (wpa_s->clear_driver_scan_cache)
171 params->only_new_results = 1;
172 ret = wpa_drv_scan(wpa_s, params);
173 wpa_scan_free_params(params);
174 work->ctx = NULL;
175 if (ret) {
176 wpa_supplicant_notify_scanning(wpa_s, 0);
177 wpas_notify_scan_done(wpa_s, 0);
178 radio_work_done(work);
179 return;
180 }
181
182 os_get_reltime(&wpa_s->scan_trigger_time);
183 wpa_s->scan_runs++;
184 wpa_s->normal_scans++;
185 wpa_s->own_scan_requested = 1;
186 wpa_s->clear_driver_scan_cache = 0;
187 wpa_s->scan_work = work;
188 }
189
190
191 /**
192 * wpa_supplicant_trigger_scan - Request driver to start a scan
193 * @wpa_s: Pointer to wpa_supplicant data
194 * @params: Scan parameters
195 * Returns: 0 on success, -1 on failure
196 */
wpa_supplicant_trigger_scan(struct wpa_supplicant * wpa_s,struct wpa_driver_scan_params * params)197 int wpa_supplicant_trigger_scan(struct wpa_supplicant *wpa_s,
198 struct wpa_driver_scan_params *params)
199 {
200 struct wpa_driver_scan_params *ctx;
201
202 if (wpa_s->scan_work) {
203 wpa_dbg(wpa_s, MSG_INFO, "Reject scan trigger since one is already pending");
204 return -1;
205 }
206
207 ctx = wpa_scan_clone_params(params);
208 if (ctx == NULL)
209 return -1;
210
211 if (radio_add_work(wpa_s, 0, "scan", 0, wpas_trigger_scan_cb, ctx) < 0)
212 {
213 wpa_scan_free_params(ctx);
214 return -1;
215 }
216
217 return 0;
218 }
219
220
221 static void
wpa_supplicant_delayed_sched_scan_timeout(void * eloop_ctx,void * timeout_ctx)222 wpa_supplicant_delayed_sched_scan_timeout(void *eloop_ctx, void *timeout_ctx)
223 {
224 struct wpa_supplicant *wpa_s = eloop_ctx;
225
226 wpa_dbg(wpa_s, MSG_DEBUG, "Starting delayed sched scan");
227
228 if (wpa_supplicant_req_sched_scan(wpa_s))
229 wpa_supplicant_req_scan(wpa_s, 0, 0);
230 }
231
232
233 static void
wpa_supplicant_sched_scan_timeout(void * eloop_ctx,void * timeout_ctx)234 wpa_supplicant_sched_scan_timeout(void *eloop_ctx, void *timeout_ctx)
235 {
236 struct wpa_supplicant *wpa_s = eloop_ctx;
237
238 wpa_dbg(wpa_s, MSG_DEBUG, "Sched scan timeout - stopping it");
239
240 wpa_s->sched_scan_timed_out = 1;
241 wpa_supplicant_cancel_sched_scan(wpa_s);
242 }
243
244
wpa_supplicant_start_sched_scan(struct wpa_supplicant * wpa_s,struct wpa_driver_scan_params * params,int interval)245 int wpa_supplicant_start_sched_scan(struct wpa_supplicant *wpa_s,
246 struct wpa_driver_scan_params *params,
247 int interval)
248 {
249 int ret;
250
251 wpa_supplicant_notify_scanning(wpa_s, 1);
252 ret = wpa_drv_sched_scan(wpa_s, params, interval * 1000);
253 if (ret)
254 wpa_supplicant_notify_scanning(wpa_s, 0);
255 else
256 wpa_s->sched_scanning = 1;
257
258 return ret;
259 }
260
261
wpa_supplicant_stop_sched_scan(struct wpa_supplicant * wpa_s)262 int wpa_supplicant_stop_sched_scan(struct wpa_supplicant *wpa_s)
263 {
264 int ret;
265
266 ret = wpa_drv_stop_sched_scan(wpa_s);
267 if (ret) {
268 wpa_dbg(wpa_s, MSG_DEBUG, "stopping sched_scan failed!");
269 /* TODO: what to do if stopping fails? */
270 return -1;
271 }
272
273 return ret;
274 }
275
276
277 static struct wpa_driver_scan_filter *
wpa_supplicant_build_filter_ssids(struct wpa_config * conf,size_t * num_ssids)278 wpa_supplicant_build_filter_ssids(struct wpa_config *conf, size_t *num_ssids)
279 {
280 struct wpa_driver_scan_filter *ssids;
281 struct wpa_ssid *ssid;
282 size_t count;
283
284 *num_ssids = 0;
285 if (!conf->filter_ssids)
286 return NULL;
287
288 for (count = 0, ssid = conf->ssid; ssid; ssid = ssid->next) {
289 if (ssid->ssid && ssid->ssid_len)
290 count++;
291 }
292 if (count == 0)
293 return NULL;
294 ssids = os_zalloc(count * sizeof(struct wpa_driver_scan_filter));
295 if (ssids == NULL)
296 return NULL;
297
298 for (ssid = conf->ssid; ssid; ssid = ssid->next) {
299 if (!ssid->ssid || !ssid->ssid_len)
300 continue;
301 os_memcpy(ssids[*num_ssids].ssid, ssid->ssid, ssid->ssid_len);
302 ssids[*num_ssids].ssid_len = ssid->ssid_len;
303 (*num_ssids)++;
304 }
305
306 return ssids;
307 }
308
309
wpa_supplicant_optimize_freqs(struct wpa_supplicant * wpa_s,struct wpa_driver_scan_params * params)310 static void wpa_supplicant_optimize_freqs(
311 struct wpa_supplicant *wpa_s, struct wpa_driver_scan_params *params)
312 {
313 #ifdef CONFIG_P2P
314 if (params->freqs == NULL && wpa_s->p2p_in_provisioning &&
315 wpa_s->go_params) {
316 /* Optimize provisioning state scan based on GO information */
317 if (wpa_s->p2p_in_provisioning < 5 &&
318 wpa_s->go_params->freq > 0) {
319 wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only GO "
320 "preferred frequency %d MHz",
321 wpa_s->go_params->freq);
322 params->freqs = os_zalloc(2 * sizeof(int));
323 if (params->freqs)
324 params->freqs[0] = wpa_s->go_params->freq;
325 } else if (wpa_s->p2p_in_provisioning < 8 &&
326 wpa_s->go_params->freq_list[0]) {
327 wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only common "
328 "channels");
329 int_array_concat(¶ms->freqs,
330 wpa_s->go_params->freq_list);
331 if (params->freqs)
332 int_array_sort_unique(params->freqs);
333 }
334 wpa_s->p2p_in_provisioning++;
335 }
336
337 if (params->freqs == NULL && wpa_s->p2p_in_invitation) {
338 /*
339 * Optimize scan based on GO information during persistent
340 * group reinvocation
341 */
342 if (wpa_s->p2p_in_invitation < 5 &&
343 wpa_s->p2p_invite_go_freq > 0) {
344 wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only GO preferred frequency %d MHz during invitation",
345 wpa_s->p2p_invite_go_freq);
346 params->freqs = os_zalloc(2 * sizeof(int));
347 if (params->freqs)
348 params->freqs[0] = wpa_s->p2p_invite_go_freq;
349 }
350 wpa_s->p2p_in_invitation++;
351 if (wpa_s->p2p_in_invitation > 20) {
352 /*
353 * This should not really happen since the variable is
354 * cleared on group removal, but if it does happen, make
355 * sure we do not get stuck in special invitation scan
356 * mode.
357 */
358 wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Clear p2p_in_invitation");
359 wpa_s->p2p_in_invitation = 0;
360 }
361 }
362 #endif /* CONFIG_P2P */
363
364 #ifdef CONFIG_WPS
365 if (params->freqs == NULL && wpa_s->after_wps && wpa_s->wps_freq) {
366 /*
367 * Optimize post-provisioning scan based on channel used
368 * during provisioning.
369 */
370 wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Scan only frequency %u MHz "
371 "that was used during provisioning", wpa_s->wps_freq);
372 params->freqs = os_zalloc(2 * sizeof(int));
373 if (params->freqs)
374 params->freqs[0] = wpa_s->wps_freq;
375 wpa_s->after_wps--;
376 } else if (wpa_s->after_wps)
377 wpa_s->after_wps--;
378
379 if (params->freqs == NULL && wpa_s->known_wps_freq && wpa_s->wps_freq)
380 {
381 /* Optimize provisioning scan based on already known channel */
382 wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Scan only frequency %u MHz",
383 wpa_s->wps_freq);
384 params->freqs = os_zalloc(2 * sizeof(int));
385 if (params->freqs)
386 params->freqs[0] = wpa_s->wps_freq;
387 wpa_s->known_wps_freq = 0; /* only do this once */
388 }
389 #endif /* CONFIG_WPS */
390 }
391
392
393 #ifdef CONFIG_INTERWORKING
wpas_add_interworking_elements(struct wpa_supplicant * wpa_s,struct wpabuf * buf)394 static void wpas_add_interworking_elements(struct wpa_supplicant *wpa_s,
395 struct wpabuf *buf)
396 {
397 if (wpa_s->conf->interworking == 0)
398 return;
399
400 wpabuf_put_u8(buf, WLAN_EID_EXT_CAPAB);
401 wpabuf_put_u8(buf, 6);
402 wpabuf_put_u8(buf, 0x00);
403 wpabuf_put_u8(buf, 0x00);
404 wpabuf_put_u8(buf, 0x00);
405 wpabuf_put_u8(buf, 0x80); /* Bit 31 - Interworking */
406 wpabuf_put_u8(buf, 0x00);
407 #ifdef CONFIG_HS20
408 wpabuf_put_u8(buf, 0x40); /* Bit 46 - WNM-Notification */
409 #else /* CONFIG_HS20 */
410 wpabuf_put_u8(buf, 0x00);
411 #endif /* CONFIG_HS20 */
412
413 wpabuf_put_u8(buf, WLAN_EID_INTERWORKING);
414 wpabuf_put_u8(buf, is_zero_ether_addr(wpa_s->conf->hessid) ? 1 :
415 1 + ETH_ALEN);
416 wpabuf_put_u8(buf, wpa_s->conf->access_network_type);
417 /* No Venue Info */
418 if (!is_zero_ether_addr(wpa_s->conf->hessid))
419 wpabuf_put_data(buf, wpa_s->conf->hessid, ETH_ALEN);
420 }
421 #endif /* CONFIG_INTERWORKING */
422
423
wpa_supplicant_extra_ies(struct wpa_supplicant * wpa_s)424 static struct wpabuf * wpa_supplicant_extra_ies(struct wpa_supplicant *wpa_s)
425 {
426 struct wpabuf *extra_ie = NULL;
427 #ifdef CONFIG_WPS
428 int wps = 0;
429 enum wps_request_type req_type = WPS_REQ_ENROLLEE_INFO;
430 #endif /* CONFIG_WPS */
431
432 #ifdef CONFIG_INTERWORKING
433 if (wpa_s->conf->interworking &&
434 wpabuf_resize(&extra_ie, 100) == 0)
435 wpas_add_interworking_elements(wpa_s, extra_ie);
436 #endif /* CONFIG_INTERWORKING */
437
438 #ifdef CONFIG_WPS
439 wps = wpas_wps_in_use(wpa_s, &req_type);
440
441 if (wps) {
442 struct wpabuf *wps_ie;
443 wps_ie = wps_build_probe_req_ie(wps == 2 ? DEV_PW_PUSHBUTTON :
444 DEV_PW_DEFAULT,
445 &wpa_s->wps->dev,
446 wpa_s->wps->uuid, req_type,
447 0, NULL);
448 if (wps_ie) {
449 if (wpabuf_resize(&extra_ie, wpabuf_len(wps_ie)) == 0)
450 wpabuf_put_buf(extra_ie, wps_ie);
451 wpabuf_free(wps_ie);
452 }
453 }
454
455 #ifdef CONFIG_P2P
456 if (wps) {
457 size_t ielen = p2p_scan_ie_buf_len(wpa_s->global->p2p);
458 if (wpabuf_resize(&extra_ie, ielen) == 0)
459 wpas_p2p_scan_ie(wpa_s, extra_ie);
460 }
461 #endif /* CONFIG_P2P */
462
463 #endif /* CONFIG_WPS */
464
465 #ifdef CONFIG_HS20
466 if (wpa_s->conf->hs20 && wpabuf_resize(&extra_ie, 7) == 0)
467 wpas_hs20_add_indication(extra_ie, -1);
468 #endif /* CONFIG_HS20 */
469
470 return extra_ie;
471 }
472
473
474 #ifdef CONFIG_P2P
475
476 /*
477 * Check whether there are any enabled networks or credentials that could be
478 * used for a non-P2P connection.
479 */
non_p2p_network_enabled(struct wpa_supplicant * wpa_s)480 static int non_p2p_network_enabled(struct wpa_supplicant *wpa_s)
481 {
482 struct wpa_ssid *ssid;
483
484 for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
485 if (wpas_network_disabled(wpa_s, ssid))
486 continue;
487 if (!ssid->p2p_group)
488 return 1;
489 }
490
491 if (wpa_s->conf->cred && wpa_s->conf->interworking &&
492 wpa_s->conf->auto_interworking)
493 return 1;
494
495 return 0;
496 }
497
498 #endif /* CONFIG_P2P */
499
500
get_mode(struct hostapd_hw_modes * modes,u16 num_modes,enum hostapd_hw_mode mode)501 static struct hostapd_hw_modes * get_mode(struct hostapd_hw_modes *modes,
502 u16 num_modes,
503 enum hostapd_hw_mode mode)
504 {
505 u16 i;
506
507 for (i = 0; i < num_modes; i++) {
508 if (modes[i].mode == mode)
509 return &modes[i];
510 }
511
512 return NULL;
513 }
514
515
wpa_setband_scan_freqs_list(struct wpa_supplicant * wpa_s,enum hostapd_hw_mode band,struct wpa_driver_scan_params * params)516 static void wpa_setband_scan_freqs_list(struct wpa_supplicant *wpa_s,
517 enum hostapd_hw_mode band,
518 struct wpa_driver_scan_params *params)
519 {
520 /* Include only supported channels for the specified band */
521 struct hostapd_hw_modes *mode;
522 int count, i;
523
524 mode = get_mode(wpa_s->hw.modes, wpa_s->hw.num_modes, band);
525 if (mode == NULL) {
526 /* No channels supported in this band - use empty list */
527 params->freqs = os_zalloc(sizeof(int));
528 return;
529 }
530
531 params->freqs = os_zalloc((mode->num_channels + 1) * sizeof(int));
532 if (params->freqs == NULL)
533 return;
534 for (count = 0, i = 0; i < mode->num_channels; i++) {
535 if (mode->channels[i].flag & HOSTAPD_CHAN_DISABLED)
536 continue;
537 params->freqs[count++] = mode->channels[i].freq;
538 }
539 }
540
541
wpa_setband_scan_freqs(struct wpa_supplicant * wpa_s,struct wpa_driver_scan_params * params)542 static void wpa_setband_scan_freqs(struct wpa_supplicant *wpa_s,
543 struct wpa_driver_scan_params *params)
544 {
545 if (wpa_s->hw.modes == NULL)
546 return; /* unknown what channels the driver supports */
547 if (params->freqs)
548 return; /* already using a limited channel set */
549 if (wpa_s->setband == WPA_SETBAND_5G)
550 wpa_setband_scan_freqs_list(wpa_s, HOSTAPD_MODE_IEEE80211A,
551 params);
552 else if (wpa_s->setband == WPA_SETBAND_2G)
553 wpa_setband_scan_freqs_list(wpa_s, HOSTAPD_MODE_IEEE80211G,
554 params);
555 }
556
557
wpa_set_scan_ssids(struct wpa_supplicant * wpa_s,struct wpa_driver_scan_params * params,size_t max_ssids)558 static void wpa_set_scan_ssids(struct wpa_supplicant *wpa_s,
559 struct wpa_driver_scan_params *params,
560 size_t max_ssids)
561 {
562 unsigned int i;
563 struct wpa_ssid *ssid;
564
565 for (i = 0; i < wpa_s->scan_id_count; i++) {
566 unsigned int j;
567
568 ssid = wpa_config_get_network(wpa_s->conf, wpa_s->scan_id[i]);
569 if (!ssid || !ssid->scan_ssid)
570 continue;
571
572 for (j = 0; j < params->num_ssids; j++) {
573 if (params->ssids[j].ssid_len == ssid->ssid_len &&
574 params->ssids[j].ssid &&
575 os_memcmp(params->ssids[j].ssid, ssid->ssid,
576 ssid->ssid_len) == 0)
577 break;
578 }
579 if (j < params->num_ssids)
580 continue; /* already in the list */
581
582 if (params->num_ssids + 1 > max_ssids) {
583 wpa_printf(MSG_DEBUG,
584 "Over max scan SSIDs for manual request");
585 break;
586 }
587
588 wpa_printf(MSG_DEBUG, "Scan SSID (manual request): %s",
589 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
590 params->ssids[params->num_ssids].ssid = ssid->ssid;
591 params->ssids[params->num_ssids].ssid_len = ssid->ssid_len;
592 params->num_ssids++;
593 }
594
595 wpa_s->scan_id_count = 0;
596 }
597
598
wpa_supplicant_scan(void * eloop_ctx,void * timeout_ctx)599 static void wpa_supplicant_scan(void *eloop_ctx, void *timeout_ctx)
600 {
601 struct wpa_supplicant *wpa_s = eloop_ctx;
602 struct wpa_ssid *ssid;
603 int ret;
604 struct wpabuf *extra_ie = NULL;
605 struct wpa_driver_scan_params params;
606 struct wpa_driver_scan_params *scan_params;
607 size_t max_ssids;
608 enum wpa_states prev_state;
609
610 if (wpa_s->pno || wpa_s->pno_sched_pending) {
611 wpa_dbg(wpa_s, MSG_DEBUG, "Skip scan - PNO is in progress");
612 return;
613 }
614
615 if (wpa_s->wpa_state == WPA_INTERFACE_DISABLED) {
616 wpa_dbg(wpa_s, MSG_DEBUG, "Skip scan - interface disabled");
617 return;
618 }
619
620 if (wpa_s->disconnected && wpa_s->scan_req == NORMAL_SCAN_REQ) {
621 wpa_dbg(wpa_s, MSG_DEBUG, "Disconnected - do not scan");
622 wpa_supplicant_set_state(wpa_s, WPA_DISCONNECTED);
623 return;
624 }
625
626 if (wpa_s->scanning) {
627 /*
628 * If we are already in scanning state, we shall reschedule the
629 * the incoming scan request.
630 */
631 wpa_dbg(wpa_s, MSG_DEBUG, "Already scanning - Reschedule the incoming scan req");
632 wpa_supplicant_req_scan(wpa_s, 1, 0);
633 return;
634 }
635
636 if (!wpa_supplicant_enabled_networks(wpa_s) &&
637 wpa_s->scan_req == NORMAL_SCAN_REQ) {
638 wpa_dbg(wpa_s, MSG_DEBUG, "No enabled networks - do not scan");
639 wpa_supplicant_set_state(wpa_s, WPA_INACTIVE);
640 return;
641 }
642
643 if (wpa_s->conf->ap_scan != 0 &&
644 (wpa_s->drv_flags & WPA_DRIVER_FLAGS_WIRED)) {
645 wpa_dbg(wpa_s, MSG_DEBUG, "Using wired authentication - "
646 "overriding ap_scan configuration");
647 wpa_s->conf->ap_scan = 0;
648 wpas_notify_ap_scan_changed(wpa_s);
649 }
650
651 if (wpa_s->conf->ap_scan == 0) {
652 wpa_supplicant_gen_assoc_event(wpa_s);
653 return;
654 }
655
656 if (wpas_p2p_in_progress(wpa_s)) {
657 wpa_dbg(wpa_s, MSG_DEBUG, "Delay station mode scan while P2P operation is in progress");
658 wpa_supplicant_req_scan(wpa_s, 5, 0);
659 return;
660 }
661
662 if (wpa_s->conf->ap_scan == 2)
663 max_ssids = 1;
664 else {
665 max_ssids = wpa_s->max_scan_ssids;
666 if (max_ssids > WPAS_MAX_SCAN_SSIDS)
667 max_ssids = WPAS_MAX_SCAN_SSIDS;
668 }
669
670 wpa_s->last_scan_req = wpa_s->scan_req;
671 wpa_s->scan_req = NORMAL_SCAN_REQ;
672
673 os_memset(¶ms, 0, sizeof(params));
674
675 prev_state = wpa_s->wpa_state;
676 if (wpa_s->wpa_state == WPA_DISCONNECTED ||
677 wpa_s->wpa_state == WPA_INACTIVE)
678 wpa_supplicant_set_state(wpa_s, WPA_SCANNING);
679
680 /*
681 * If autoscan has set its own scanning parameters
682 */
683 if (wpa_s->autoscan_params != NULL) {
684 scan_params = wpa_s->autoscan_params;
685 goto scan;
686 }
687
688 if (wpa_s->last_scan_req != MANUAL_SCAN_REQ &&
689 wpa_s->connect_without_scan) {
690 for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
691 if (ssid == wpa_s->connect_without_scan)
692 break;
693 }
694 wpa_s->connect_without_scan = NULL;
695 if (ssid) {
696 wpa_printf(MSG_DEBUG, "Start a pre-selected network "
697 "without scan step");
698 wpa_supplicant_associate(wpa_s, NULL, ssid);
699 return;
700 }
701 }
702
703 #ifdef CONFIG_P2P
704 if ((wpa_s->p2p_in_provisioning || wpa_s->show_group_started) &&
705 wpa_s->go_params) {
706 wpa_printf(MSG_DEBUG, "P2P: Use specific SSID for scan during P2P group formation (p2p_in_provisioning=%d show_group_started=%d)",
707 wpa_s->p2p_in_provisioning,
708 wpa_s->show_group_started);
709 params.ssids[0].ssid = wpa_s->go_params->ssid;
710 params.ssids[0].ssid_len = wpa_s->go_params->ssid_len;
711 params.num_ssids = 1;
712 goto ssid_list_set;
713 }
714
715 if (wpa_s->p2p_in_invitation) {
716 if (wpa_s->current_ssid) {
717 wpa_printf(MSG_DEBUG, "P2P: Use specific SSID for scan during invitation");
718 params.ssids[0].ssid = wpa_s->current_ssid->ssid;
719 params.ssids[0].ssid_len =
720 wpa_s->current_ssid->ssid_len;
721 params.num_ssids = 1;
722 } else {
723 wpa_printf(MSG_DEBUG, "P2P: No specific SSID known for scan during invitation");
724 }
725 goto ssid_list_set;
726 }
727 #endif /* CONFIG_P2P */
728
729 /* Find the starting point from which to continue scanning */
730 ssid = wpa_s->conf->ssid;
731 if (wpa_s->prev_scan_ssid != WILDCARD_SSID_SCAN) {
732 while (ssid) {
733 if (ssid == wpa_s->prev_scan_ssid) {
734 ssid = ssid->next;
735 break;
736 }
737 ssid = ssid->next;
738 }
739 }
740
741 if (wpa_s->last_scan_req != MANUAL_SCAN_REQ &&
742 wpa_s->conf->ap_scan == 2) {
743 wpa_s->connect_without_scan = NULL;
744 wpa_s->prev_scan_wildcard = 0;
745 wpa_supplicant_assoc_try(wpa_s, ssid);
746 return;
747 } else if (wpa_s->conf->ap_scan == 2) {
748 /*
749 * User-initiated scan request in ap_scan == 2; scan with
750 * wildcard SSID.
751 */
752 ssid = NULL;
753 } else if (wpa_s->reattach && wpa_s->current_ssid != NULL) {
754 /*
755 * Perform single-channel single-SSID scan for
756 * reassociate-to-same-BSS operation.
757 */
758 /* Setup SSID */
759 ssid = wpa_s->current_ssid;
760 wpa_hexdump_ascii(MSG_DEBUG, "Scan SSID",
761 ssid->ssid, ssid->ssid_len);
762 params.ssids[0].ssid = ssid->ssid;
763 params.ssids[0].ssid_len = ssid->ssid_len;
764 params.num_ssids = 1;
765
766 /*
767 * Allocate memory for frequency array, allocate one extra
768 * slot for the zero-terminator.
769 */
770 params.freqs = os_malloc(sizeof(int) * 2);
771 if (params.freqs == NULL) {
772 wpa_dbg(wpa_s, MSG_ERROR, "Memory allocation failed");
773 return;
774 }
775 params.freqs[0] = wpa_s->assoc_freq;
776 params.freqs[1] = 0;
777
778 /*
779 * Reset the reattach flag so that we fall back to full scan if
780 * this scan fails.
781 */
782 wpa_s->reattach = 0;
783 } else {
784 struct wpa_ssid *start = ssid, *tssid;
785 int freqs_set = 0;
786 if (ssid == NULL && max_ssids > 1)
787 ssid = wpa_s->conf->ssid;
788 while (ssid) {
789 if (!wpas_network_disabled(wpa_s, ssid) &&
790 ssid->scan_ssid) {
791 wpa_hexdump_ascii(MSG_DEBUG, "Scan SSID",
792 ssid->ssid, ssid->ssid_len);
793 params.ssids[params.num_ssids].ssid =
794 ssid->ssid;
795 params.ssids[params.num_ssids].ssid_len =
796 ssid->ssid_len;
797 params.num_ssids++;
798 if (params.num_ssids + 1 >= max_ssids)
799 break;
800 }
801 ssid = ssid->next;
802 if (ssid == start)
803 break;
804 if (ssid == NULL && max_ssids > 1 &&
805 start != wpa_s->conf->ssid)
806 ssid = wpa_s->conf->ssid;
807 }
808
809 if (wpa_s->scan_id_count &&
810 wpa_s->last_scan_req == MANUAL_SCAN_REQ)
811 wpa_set_scan_ssids(wpa_s, ¶ms, max_ssids);
812
813 for (tssid = wpa_s->conf->ssid; tssid; tssid = tssid->next) {
814 if (wpas_network_disabled(wpa_s, tssid))
815 continue;
816 if ((params.freqs || !freqs_set) && tssid->scan_freq) {
817 int_array_concat(¶ms.freqs,
818 tssid->scan_freq);
819 } else {
820 os_free(params.freqs);
821 params.freqs = NULL;
822 }
823 freqs_set = 1;
824 }
825 int_array_sort_unique(params.freqs);
826 }
827
828 if (ssid && max_ssids == 1) {
829 /*
830 * If the driver is limited to 1 SSID at a time interleave
831 * wildcard SSID scans with specific SSID scans to avoid
832 * waiting a long time for a wildcard scan.
833 */
834 if (!wpa_s->prev_scan_wildcard) {
835 params.ssids[0].ssid = NULL;
836 params.ssids[0].ssid_len = 0;
837 wpa_s->prev_scan_wildcard = 1;
838 wpa_dbg(wpa_s, MSG_DEBUG, "Starting AP scan for "
839 "wildcard SSID (Interleave with specific)");
840 } else {
841 wpa_s->prev_scan_ssid = ssid;
842 wpa_s->prev_scan_wildcard = 0;
843 wpa_dbg(wpa_s, MSG_DEBUG,
844 "Starting AP scan for specific SSID: %s",
845 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
846 }
847 } else if (ssid) {
848 /* max_ssids > 1 */
849
850 wpa_s->prev_scan_ssid = ssid;
851 wpa_dbg(wpa_s, MSG_DEBUG, "Include wildcard SSID in "
852 "the scan request");
853 params.num_ssids++;
854 } else if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
855 wpa_s->manual_scan_passive && params.num_ssids == 0) {
856 wpa_dbg(wpa_s, MSG_DEBUG, "Use passive scan based on manual request");
857 } else {
858 wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
859 params.num_ssids++;
860 wpa_dbg(wpa_s, MSG_DEBUG, "Starting AP scan for wildcard "
861 "SSID");
862 }
863 #ifdef CONFIG_P2P
864 ssid_list_set:
865 #endif /* CONFIG_P2P */
866
867 wpa_supplicant_optimize_freqs(wpa_s, ¶ms);
868 extra_ie = wpa_supplicant_extra_ies(wpa_s);
869
870 if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
871 wpa_s->manual_scan_only_new)
872 params.only_new_results = 1;
873
874 if (wpa_s->last_scan_req == MANUAL_SCAN_REQ && params.freqs == NULL &&
875 wpa_s->manual_scan_freqs) {
876 wpa_dbg(wpa_s, MSG_DEBUG, "Limit manual scan to specified channels");
877 params.freqs = wpa_s->manual_scan_freqs;
878 wpa_s->manual_scan_freqs = NULL;
879 }
880
881 if (params.freqs == NULL && wpa_s->next_scan_freqs) {
882 wpa_dbg(wpa_s, MSG_DEBUG, "Optimize scan based on previously "
883 "generated frequency list");
884 params.freqs = wpa_s->next_scan_freqs;
885 } else
886 os_free(wpa_s->next_scan_freqs);
887 wpa_s->next_scan_freqs = NULL;
888 wpa_setband_scan_freqs(wpa_s, ¶ms);
889
890 /* See if user specified frequencies. If so, scan only those. */
891 if (wpa_s->conf->freq_list && !params.freqs) {
892 wpa_dbg(wpa_s, MSG_DEBUG,
893 "Optimize scan based on conf->freq_list");
894 int_array_concat(¶ms.freqs, wpa_s->conf->freq_list);
895 }
896
897 /* Use current associated channel? */
898 if (wpa_s->conf->scan_cur_freq && !params.freqs) {
899 unsigned int num = wpa_s->num_multichan_concurrent;
900
901 params.freqs = os_calloc(num + 1, sizeof(int));
902 if (params.freqs) {
903 num = get_shared_radio_freqs(wpa_s, params.freqs, num);
904 if (num > 0) {
905 wpa_dbg(wpa_s, MSG_DEBUG, "Scan only the "
906 "current operating channels since "
907 "scan_cur_freq is enabled");
908 } else {
909 os_free(params.freqs);
910 params.freqs = NULL;
911 }
912 }
913 }
914
915 params.filter_ssids = wpa_supplicant_build_filter_ssids(
916 wpa_s->conf, ¶ms.num_filter_ssids);
917 if (extra_ie) {
918 params.extra_ies = wpabuf_head(extra_ie);
919 params.extra_ies_len = wpabuf_len(extra_ie);
920 }
921
922 #ifdef CONFIG_P2P
923 if (wpa_s->p2p_in_provisioning || wpa_s->p2p_in_invitation ||
924 (wpa_s->show_group_started && wpa_s->go_params)) {
925 /*
926 * The interface may not yet be in P2P mode, so we have to
927 * explicitly request P2P probe to disable CCK rates.
928 */
929 params.p2p_probe = 1;
930 }
931 #endif /* CONFIG_P2P */
932
933 scan_params = ¶ms;
934
935 scan:
936 #ifdef CONFIG_P2P
937 /*
938 * If the driver does not support multi-channel concurrency and a
939 * virtual interface that shares the same radio with the wpa_s interface
940 * is operating there may not be need to scan other channels apart from
941 * the current operating channel on the other virtual interface. Filter
942 * out other channels in case we are trying to find a connection for a
943 * station interface when we are not configured to prefer station
944 * connection and a concurrent operation is already in process.
945 */
946 if (wpa_s->scan_for_connection &&
947 wpa_s->last_scan_req == NORMAL_SCAN_REQ &&
948 !scan_params->freqs && !params.freqs &&
949 wpas_is_p2p_prioritized(wpa_s) &&
950 wpa_s->p2p_group_interface == NOT_P2P_GROUP_INTERFACE &&
951 non_p2p_network_enabled(wpa_s)) {
952 unsigned int num = wpa_s->num_multichan_concurrent;
953
954 params.freqs = os_calloc(num + 1, sizeof(int));
955 if (params.freqs) {
956 num = get_shared_radio_freqs(wpa_s, params.freqs, num);
957 if (num > 0 && num == wpa_s->num_multichan_concurrent) {
958 wpa_dbg(wpa_s, MSG_DEBUG, "Scan only the current operating channels since all channels are already used");
959 } else {
960 os_free(params.freqs);
961 params.freqs = NULL;
962 }
963 }
964 }
965 #endif /* CONFIG_P2P */
966
967 ret = wpa_supplicant_trigger_scan(wpa_s, scan_params);
968
969 if (ret && wpa_s->last_scan_req == MANUAL_SCAN_REQ && params.freqs &&
970 !wpa_s->manual_scan_freqs) {
971 /* Restore manual_scan_freqs for the next attempt */
972 wpa_s->manual_scan_freqs = params.freqs;
973 params.freqs = NULL;
974 }
975
976 wpabuf_free(extra_ie);
977 os_free(params.freqs);
978 os_free(params.filter_ssids);
979
980 if (ret) {
981 wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate AP scan");
982 if (prev_state != wpa_s->wpa_state)
983 wpa_supplicant_set_state(wpa_s, prev_state);
984 /* Restore scan_req since we will try to scan again */
985 wpa_s->scan_req = wpa_s->last_scan_req;
986 wpa_supplicant_req_scan(wpa_s, 1, 0);
987 } else {
988 wpa_s->scan_for_connection = 0;
989 }
990 }
991
992
wpa_supplicant_update_scan_int(struct wpa_supplicant * wpa_s,int sec)993 void wpa_supplicant_update_scan_int(struct wpa_supplicant *wpa_s, int sec)
994 {
995 struct os_reltime remaining, new_int;
996 int cancelled;
997
998 cancelled = eloop_cancel_timeout_one(wpa_supplicant_scan, wpa_s, NULL,
999 &remaining);
1000
1001 new_int.sec = sec;
1002 new_int.usec = 0;
1003 if (cancelled && os_reltime_before(&remaining, &new_int)) {
1004 new_int.sec = remaining.sec;
1005 new_int.usec = remaining.usec;
1006 }
1007
1008 if (cancelled) {
1009 eloop_register_timeout(new_int.sec, new_int.usec,
1010 wpa_supplicant_scan, wpa_s, NULL);
1011 }
1012 wpa_s->scan_interval = sec;
1013 }
1014
1015
1016 /**
1017 * wpa_supplicant_req_scan - Schedule a scan for neighboring access points
1018 * @wpa_s: Pointer to wpa_supplicant data
1019 * @sec: Number of seconds after which to scan
1020 * @usec: Number of microseconds after which to scan
1021 *
1022 * This function is used to schedule a scan for neighboring access points after
1023 * the specified time.
1024 */
wpa_supplicant_req_scan(struct wpa_supplicant * wpa_s,int sec,int usec)1025 void wpa_supplicant_req_scan(struct wpa_supplicant *wpa_s, int sec, int usec)
1026 {
1027 int res = eloop_deplete_timeout(sec, usec, wpa_supplicant_scan, wpa_s,
1028 NULL);
1029 if (res == 1) {
1030 wpa_dbg(wpa_s, MSG_DEBUG, "Rescheduling scan request: %d.%06d sec",
1031 sec, usec);
1032 } else if (res == 0) {
1033 wpa_dbg(wpa_s, MSG_DEBUG, "Ignore new scan request for %d.%06d sec since an earlier request is scheduled to trigger sooner",
1034 sec, usec);
1035 } else {
1036 wpa_dbg(wpa_s, MSG_DEBUG, "Setting scan request: %d.%06d sec",
1037 sec, usec);
1038 eloop_register_timeout(sec, usec, wpa_supplicant_scan, wpa_s, NULL);
1039 }
1040 }
1041
1042
1043 /**
1044 * wpa_supplicant_delayed_sched_scan - Request a delayed scheduled scan
1045 * @wpa_s: Pointer to wpa_supplicant data
1046 * @sec: Number of seconds after which to scan
1047 * @usec: Number of microseconds after which to scan
1048 * Returns: 0 on success or -1 otherwise
1049 *
1050 * This function is used to schedule periodic scans for neighboring
1051 * access points after the specified time.
1052 */
wpa_supplicant_delayed_sched_scan(struct wpa_supplicant * wpa_s,int sec,int usec)1053 int wpa_supplicant_delayed_sched_scan(struct wpa_supplicant *wpa_s,
1054 int sec, int usec)
1055 {
1056 if (!wpa_s->sched_scan_supported)
1057 return -1;
1058
1059 eloop_register_timeout(sec, usec,
1060 wpa_supplicant_delayed_sched_scan_timeout,
1061 wpa_s, NULL);
1062
1063 return 0;
1064 }
1065
1066
1067 /**
1068 * wpa_supplicant_req_sched_scan - Start a periodic scheduled scan
1069 * @wpa_s: Pointer to wpa_supplicant data
1070 * Returns: 0 is sched_scan was started or -1 otherwise
1071 *
1072 * This function is used to schedule periodic scans for neighboring
1073 * access points repeating the scan continuously.
1074 */
wpa_supplicant_req_sched_scan(struct wpa_supplicant * wpa_s)1075 int wpa_supplicant_req_sched_scan(struct wpa_supplicant *wpa_s)
1076 {
1077 struct wpa_driver_scan_params params;
1078 struct wpa_driver_scan_params *scan_params;
1079 enum wpa_states prev_state;
1080 struct wpa_ssid *ssid = NULL;
1081 struct wpabuf *extra_ie = NULL;
1082 int ret;
1083 unsigned int max_sched_scan_ssids;
1084 int wildcard = 0;
1085 int need_ssids;
1086
1087 if (!wpa_s->sched_scan_supported)
1088 return -1;
1089
1090 if (wpa_s->max_sched_scan_ssids > WPAS_MAX_SCAN_SSIDS)
1091 max_sched_scan_ssids = WPAS_MAX_SCAN_SSIDS;
1092 else
1093 max_sched_scan_ssids = wpa_s->max_sched_scan_ssids;
1094 if (max_sched_scan_ssids < 1 || wpa_s->conf->disable_scan_offload)
1095 return -1;
1096
1097 if (wpa_s->sched_scanning) {
1098 wpa_dbg(wpa_s, MSG_DEBUG, "Already sched scanning");
1099 return 0;
1100 }
1101
1102 need_ssids = 0;
1103 for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
1104 if (!wpas_network_disabled(wpa_s, ssid) && !ssid->scan_ssid) {
1105 /* Use wildcard SSID to find this network */
1106 wildcard = 1;
1107 } else if (!wpas_network_disabled(wpa_s, ssid) &&
1108 ssid->ssid_len)
1109 need_ssids++;
1110
1111 #ifdef CONFIG_WPS
1112 if (!wpas_network_disabled(wpa_s, ssid) &&
1113 ssid->key_mgmt == WPA_KEY_MGMT_WPS) {
1114 /*
1115 * Normal scan is more reliable and faster for WPS
1116 * operations and since these are for short periods of
1117 * time, the benefit of trying to use sched_scan would
1118 * be limited.
1119 */
1120 wpa_dbg(wpa_s, MSG_DEBUG, "Use normal scan instead of "
1121 "sched_scan for WPS");
1122 return -1;
1123 }
1124 #endif /* CONFIG_WPS */
1125 }
1126 if (wildcard)
1127 need_ssids++;
1128
1129 if (wpa_s->normal_scans < 3 &&
1130 (need_ssids <= wpa_s->max_scan_ssids ||
1131 wpa_s->max_scan_ssids >= (int) max_sched_scan_ssids)) {
1132 /*
1133 * When normal scan can speed up operations, use that for the
1134 * first operations before starting the sched_scan to allow
1135 * user space sleep more. We do this only if the normal scan
1136 * has functionality that is suitable for this or if the
1137 * sched_scan does not have better support for multiple SSIDs.
1138 */
1139 wpa_dbg(wpa_s, MSG_DEBUG, "Use normal scan instead of "
1140 "sched_scan for initial scans (normal_scans=%d)",
1141 wpa_s->normal_scans);
1142 return -1;
1143 }
1144
1145 os_memset(¶ms, 0, sizeof(params));
1146
1147 /* If we can't allocate space for the filters, we just don't filter */
1148 params.filter_ssids = os_zalloc(wpa_s->max_match_sets *
1149 sizeof(struct wpa_driver_scan_filter));
1150
1151 prev_state = wpa_s->wpa_state;
1152 if (wpa_s->wpa_state == WPA_DISCONNECTED ||
1153 wpa_s->wpa_state == WPA_INACTIVE)
1154 wpa_supplicant_set_state(wpa_s, WPA_SCANNING);
1155
1156 if (wpa_s->autoscan_params != NULL) {
1157 scan_params = wpa_s->autoscan_params;
1158 goto scan;
1159 }
1160
1161 /* Find the starting point from which to continue scanning */
1162 ssid = wpa_s->conf->ssid;
1163 if (wpa_s->prev_sched_ssid) {
1164 while (ssid) {
1165 if (ssid == wpa_s->prev_sched_ssid) {
1166 ssid = ssid->next;
1167 break;
1168 }
1169 ssid = ssid->next;
1170 }
1171 }
1172
1173 if (!ssid || !wpa_s->prev_sched_ssid) {
1174 wpa_dbg(wpa_s, MSG_DEBUG, "Beginning of SSID list");
1175 if (wpa_s->conf->sched_scan_interval)
1176 wpa_s->sched_scan_interval =
1177 wpa_s->conf->sched_scan_interval;
1178 if (wpa_s->sched_scan_interval == 0)
1179 wpa_s->sched_scan_interval = 10;
1180 wpa_s->sched_scan_timeout = max_sched_scan_ssids * 2;
1181 wpa_s->first_sched_scan = 1;
1182 ssid = wpa_s->conf->ssid;
1183 wpa_s->prev_sched_ssid = ssid;
1184 }
1185
1186 if (wildcard) {
1187 wpa_dbg(wpa_s, MSG_DEBUG, "Add wildcard SSID to sched_scan");
1188 params.num_ssids++;
1189 }
1190
1191 while (ssid) {
1192 if (wpas_network_disabled(wpa_s, ssid))
1193 goto next;
1194
1195 if (params.num_filter_ssids < wpa_s->max_match_sets &&
1196 params.filter_ssids && ssid->ssid && ssid->ssid_len) {
1197 wpa_dbg(wpa_s, MSG_DEBUG, "add to filter ssid: %s",
1198 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
1199 os_memcpy(params.filter_ssids[params.num_filter_ssids].ssid,
1200 ssid->ssid, ssid->ssid_len);
1201 params.filter_ssids[params.num_filter_ssids].ssid_len =
1202 ssid->ssid_len;
1203 params.num_filter_ssids++;
1204 } else if (params.filter_ssids && ssid->ssid && ssid->ssid_len)
1205 {
1206 wpa_dbg(wpa_s, MSG_DEBUG, "Not enough room for SSID "
1207 "filter for sched_scan - drop filter");
1208 os_free(params.filter_ssids);
1209 params.filter_ssids = NULL;
1210 params.num_filter_ssids = 0;
1211 }
1212
1213 if (ssid->scan_ssid && ssid->ssid && ssid->ssid_len) {
1214 if (params.num_ssids == max_sched_scan_ssids)
1215 break; /* only room for broadcast SSID */
1216 wpa_dbg(wpa_s, MSG_DEBUG,
1217 "add to active scan ssid: %s",
1218 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
1219 params.ssids[params.num_ssids].ssid =
1220 ssid->ssid;
1221 params.ssids[params.num_ssids].ssid_len =
1222 ssid->ssid_len;
1223 params.num_ssids++;
1224 if (params.num_ssids >= max_sched_scan_ssids) {
1225 wpa_s->prev_sched_ssid = ssid;
1226 do {
1227 ssid = ssid->next;
1228 } while (ssid &&
1229 (wpas_network_disabled(wpa_s, ssid) ||
1230 !ssid->scan_ssid));
1231 break;
1232 }
1233 }
1234
1235 next:
1236 wpa_s->prev_sched_ssid = ssid;
1237 ssid = ssid->next;
1238 }
1239
1240 if (params.num_filter_ssids == 0) {
1241 os_free(params.filter_ssids);
1242 params.filter_ssids = NULL;
1243 }
1244
1245 extra_ie = wpa_supplicant_extra_ies(wpa_s);
1246 if (extra_ie) {
1247 params.extra_ies = wpabuf_head(extra_ie);
1248 params.extra_ies_len = wpabuf_len(extra_ie);
1249 }
1250
1251 if (wpa_s->conf->filter_rssi)
1252 params.filter_rssi = wpa_s->conf->filter_rssi;
1253
1254 /* See if user specified frequencies. If so, scan only those. */
1255 if (wpa_s->conf->freq_list && !params.freqs) {
1256 wpa_dbg(wpa_s, MSG_DEBUG,
1257 "Optimize scan based on conf->freq_list");
1258 int_array_concat(¶ms.freqs, wpa_s->conf->freq_list);
1259 }
1260
1261 scan_params = ¶ms;
1262
1263 scan:
1264 if (ssid || !wpa_s->first_sched_scan) {
1265 wpa_dbg(wpa_s, MSG_DEBUG,
1266 "Starting sched scan: interval %d timeout %d",
1267 wpa_s->sched_scan_interval, wpa_s->sched_scan_timeout);
1268 } else {
1269 wpa_dbg(wpa_s, MSG_DEBUG,
1270 "Starting sched scan: interval %d (no timeout)",
1271 wpa_s->sched_scan_interval);
1272 }
1273
1274 wpa_setband_scan_freqs(wpa_s, scan_params);
1275
1276 ret = wpa_supplicant_start_sched_scan(wpa_s, scan_params,
1277 wpa_s->sched_scan_interval);
1278 wpabuf_free(extra_ie);
1279 os_free(params.filter_ssids);
1280 if (ret) {
1281 wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate sched scan");
1282 if (prev_state != wpa_s->wpa_state)
1283 wpa_supplicant_set_state(wpa_s, prev_state);
1284 return ret;
1285 }
1286
1287 /* If we have more SSIDs to scan, add a timeout so we scan them too */
1288 if (ssid || !wpa_s->first_sched_scan) {
1289 wpa_s->sched_scan_timed_out = 0;
1290 eloop_register_timeout(wpa_s->sched_scan_timeout, 0,
1291 wpa_supplicant_sched_scan_timeout,
1292 wpa_s, NULL);
1293 wpa_s->first_sched_scan = 0;
1294 wpa_s->sched_scan_timeout /= 2;
1295 wpa_s->sched_scan_interval *= 2;
1296 if (wpa_s->sched_scan_timeout < wpa_s->sched_scan_interval) {
1297 wpa_s->sched_scan_interval = 10;
1298 wpa_s->sched_scan_timeout = max_sched_scan_ssids * 2;
1299 }
1300 }
1301
1302 /* If there is no more ssids, start next time from the beginning */
1303 if (!ssid)
1304 wpa_s->prev_sched_ssid = NULL;
1305
1306 return 0;
1307 }
1308
1309
1310 /**
1311 * wpa_supplicant_cancel_scan - Cancel a scheduled scan request
1312 * @wpa_s: Pointer to wpa_supplicant data
1313 *
1314 * This function is used to cancel a scan request scheduled with
1315 * wpa_supplicant_req_scan().
1316 */
wpa_supplicant_cancel_scan(struct wpa_supplicant * wpa_s)1317 void wpa_supplicant_cancel_scan(struct wpa_supplicant *wpa_s)
1318 {
1319 wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling scan request");
1320 eloop_cancel_timeout(wpa_supplicant_scan, wpa_s, NULL);
1321 }
1322
1323
1324 /**
1325 * wpa_supplicant_cancel_delayed_sched_scan - Stop a delayed scheduled scan
1326 * @wpa_s: Pointer to wpa_supplicant data
1327 *
1328 * This function is used to stop a delayed scheduled scan.
1329 */
wpa_supplicant_cancel_delayed_sched_scan(struct wpa_supplicant * wpa_s)1330 void wpa_supplicant_cancel_delayed_sched_scan(struct wpa_supplicant *wpa_s)
1331 {
1332 if (!wpa_s->sched_scan_supported)
1333 return;
1334
1335 wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling delayed sched scan");
1336 eloop_cancel_timeout(wpa_supplicant_delayed_sched_scan_timeout,
1337 wpa_s, NULL);
1338 }
1339
1340
1341 /**
1342 * wpa_supplicant_cancel_sched_scan - Stop running scheduled scans
1343 * @wpa_s: Pointer to wpa_supplicant data
1344 *
1345 * This function is used to stop a periodic scheduled scan.
1346 */
wpa_supplicant_cancel_sched_scan(struct wpa_supplicant * wpa_s)1347 void wpa_supplicant_cancel_sched_scan(struct wpa_supplicant *wpa_s)
1348 {
1349 if (!wpa_s->sched_scanning)
1350 return;
1351
1352 wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling sched scan");
1353 eloop_cancel_timeout(wpa_supplicant_sched_scan_timeout, wpa_s, NULL);
1354 wpa_supplicant_stop_sched_scan(wpa_s);
1355 }
1356
1357
1358 /**
1359 * wpa_supplicant_notify_scanning - Indicate possible scan state change
1360 * @wpa_s: Pointer to wpa_supplicant data
1361 * @scanning: Whether scanning is currently in progress
1362 *
1363 * This function is to generate scanning notifycations. It is called whenever
1364 * there may have been a change in scanning (scan started, completed, stopped).
1365 * wpas_notify_scanning() is called whenever the scanning state changed from the
1366 * previously notified state.
1367 */
wpa_supplicant_notify_scanning(struct wpa_supplicant * wpa_s,int scanning)1368 void wpa_supplicant_notify_scanning(struct wpa_supplicant *wpa_s,
1369 int scanning)
1370 {
1371 if (wpa_s->scanning != scanning) {
1372 wpa_s->scanning = scanning;
1373 wpas_notify_scanning(wpa_s);
1374 }
1375 }
1376
1377
wpa_scan_get_max_rate(const struct wpa_scan_res * res)1378 static int wpa_scan_get_max_rate(const struct wpa_scan_res *res)
1379 {
1380 int rate = 0;
1381 const u8 *ie;
1382 int i;
1383
1384 ie = wpa_scan_get_ie(res, WLAN_EID_SUPP_RATES);
1385 for (i = 0; ie && i < ie[1]; i++) {
1386 if ((ie[i + 2] & 0x7f) > rate)
1387 rate = ie[i + 2] & 0x7f;
1388 }
1389
1390 ie = wpa_scan_get_ie(res, WLAN_EID_EXT_SUPP_RATES);
1391 for (i = 0; ie && i < ie[1]; i++) {
1392 if ((ie[i + 2] & 0x7f) > rate)
1393 rate = ie[i + 2] & 0x7f;
1394 }
1395
1396 return rate;
1397 }
1398
1399
1400 /**
1401 * wpa_scan_get_ie - Fetch a specified information element from a scan result
1402 * @res: Scan result entry
1403 * @ie: Information element identitifier (WLAN_EID_*)
1404 * Returns: Pointer to the information element (id field) or %NULL if not found
1405 *
1406 * This function returns the first matching information element in the scan
1407 * result.
1408 */
wpa_scan_get_ie(const struct wpa_scan_res * res,u8 ie)1409 const u8 * wpa_scan_get_ie(const struct wpa_scan_res *res, u8 ie)
1410 {
1411 const u8 *end, *pos;
1412
1413 pos = (const u8 *) (res + 1);
1414 end = pos + res->ie_len;
1415
1416 while (pos + 1 < end) {
1417 if (pos + 2 + pos[1] > end)
1418 break;
1419 if (pos[0] == ie)
1420 return pos;
1421 pos += 2 + pos[1];
1422 }
1423
1424 return NULL;
1425 }
1426
1427
1428 /**
1429 * wpa_scan_get_vendor_ie - Fetch vendor information element from a scan result
1430 * @res: Scan result entry
1431 * @vendor_type: Vendor type (four octets starting the IE payload)
1432 * Returns: Pointer to the information element (id field) or %NULL if not found
1433 *
1434 * This function returns the first matching information element in the scan
1435 * result.
1436 */
wpa_scan_get_vendor_ie(const struct wpa_scan_res * res,u32 vendor_type)1437 const u8 * wpa_scan_get_vendor_ie(const struct wpa_scan_res *res,
1438 u32 vendor_type)
1439 {
1440 const u8 *end, *pos;
1441
1442 pos = (const u8 *) (res + 1);
1443 end = pos + res->ie_len;
1444
1445 while (pos + 1 < end) {
1446 if (pos + 2 + pos[1] > end)
1447 break;
1448 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1449 vendor_type == WPA_GET_BE32(&pos[2]))
1450 return pos;
1451 pos += 2 + pos[1];
1452 }
1453
1454 return NULL;
1455 }
1456
1457
1458 /**
1459 * wpa_scan_get_vendor_ie_beacon - Fetch vendor information from a scan result
1460 * @res: Scan result entry
1461 * @vendor_type: Vendor type (four octets starting the IE payload)
1462 * Returns: Pointer to the information element (id field) or %NULL if not found
1463 *
1464 * This function returns the first matching information element in the scan
1465 * result.
1466 *
1467 * This function is like wpa_scan_get_vendor_ie(), but uses IE buffer only
1468 * from Beacon frames instead of either Beacon or Probe Response frames.
1469 */
wpa_scan_get_vendor_ie_beacon(const struct wpa_scan_res * res,u32 vendor_type)1470 const u8 * wpa_scan_get_vendor_ie_beacon(const struct wpa_scan_res *res,
1471 u32 vendor_type)
1472 {
1473 const u8 *end, *pos;
1474
1475 if (res->beacon_ie_len == 0)
1476 return NULL;
1477
1478 pos = (const u8 *) (res + 1);
1479 pos += res->ie_len;
1480 end = pos + res->beacon_ie_len;
1481
1482 while (pos + 1 < end) {
1483 if (pos + 2 + pos[1] > end)
1484 break;
1485 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1486 vendor_type == WPA_GET_BE32(&pos[2]))
1487 return pos;
1488 pos += 2 + pos[1];
1489 }
1490
1491 return NULL;
1492 }
1493
1494
1495 /**
1496 * wpa_scan_get_vendor_ie_multi - Fetch vendor IE data from a scan result
1497 * @res: Scan result entry
1498 * @vendor_type: Vendor type (four octets starting the IE payload)
1499 * Returns: Pointer to the information element payload or %NULL if not found
1500 *
1501 * This function returns concatenated payload of possibly fragmented vendor
1502 * specific information elements in the scan result. The caller is responsible
1503 * for freeing the returned buffer.
1504 */
wpa_scan_get_vendor_ie_multi(const struct wpa_scan_res * res,u32 vendor_type)1505 struct wpabuf * wpa_scan_get_vendor_ie_multi(const struct wpa_scan_res *res,
1506 u32 vendor_type)
1507 {
1508 struct wpabuf *buf;
1509 const u8 *end, *pos;
1510
1511 buf = wpabuf_alloc(res->ie_len);
1512 if (buf == NULL)
1513 return NULL;
1514
1515 pos = (const u8 *) (res + 1);
1516 end = pos + res->ie_len;
1517
1518 while (pos + 1 < end) {
1519 if (pos + 2 + pos[1] > end)
1520 break;
1521 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1522 vendor_type == WPA_GET_BE32(&pos[2]))
1523 wpabuf_put_data(buf, pos + 2 + 4, pos[1] - 4);
1524 pos += 2 + pos[1];
1525 }
1526
1527 if (wpabuf_len(buf) == 0) {
1528 wpabuf_free(buf);
1529 buf = NULL;
1530 }
1531
1532 return buf;
1533 }
1534
1535
1536 /*
1537 * Channels with a great SNR can operate at full rate. What is a great SNR?
1538 * This doc https://supportforums.cisco.com/docs/DOC-12954 says, "the general
1539 * rule of thumb is that any SNR above 20 is good." This one
1540 * http://www.cisco.com/en/US/tech/tk722/tk809/technologies_q_and_a_item09186a00805e9a96.shtml#qa23
1541 * recommends 25 as a minimum SNR for 54 Mbps data rate. 30 is chosen here as a
1542 * conservative value.
1543 */
1544 #define GREAT_SNR 30
1545
1546 /* Compare function for sorting scan results. Return >0 if @b is considered
1547 * better. */
wpa_scan_result_compar(const void * a,const void * b)1548 static int wpa_scan_result_compar(const void *a, const void *b)
1549 {
1550 #define IS_5GHZ(n) (n > 4000)
1551 #define MIN(a,b) a < b ? a : b
1552 struct wpa_scan_res **_wa = (void *) a;
1553 struct wpa_scan_res **_wb = (void *) b;
1554 struct wpa_scan_res *wa = *_wa;
1555 struct wpa_scan_res *wb = *_wb;
1556 int wpa_a, wpa_b, maxrate_a, maxrate_b;
1557 int snr_a, snr_b;
1558
1559 /* WPA/WPA2 support preferred */
1560 wpa_a = wpa_scan_get_vendor_ie(wa, WPA_IE_VENDOR_TYPE) != NULL ||
1561 wpa_scan_get_ie(wa, WLAN_EID_RSN) != NULL;
1562 wpa_b = wpa_scan_get_vendor_ie(wb, WPA_IE_VENDOR_TYPE) != NULL ||
1563 wpa_scan_get_ie(wb, WLAN_EID_RSN) != NULL;
1564
1565 if (wpa_b && !wpa_a)
1566 return 1;
1567 if (!wpa_b && wpa_a)
1568 return -1;
1569
1570 /* privacy support preferred */
1571 if ((wa->caps & IEEE80211_CAP_PRIVACY) == 0 &&
1572 (wb->caps & IEEE80211_CAP_PRIVACY))
1573 return 1;
1574 if ((wa->caps & IEEE80211_CAP_PRIVACY) &&
1575 (wb->caps & IEEE80211_CAP_PRIVACY) == 0)
1576 return -1;
1577
1578 if ((wa->flags & wb->flags & WPA_SCAN_LEVEL_DBM) &&
1579 !((wa->flags | wb->flags) & WPA_SCAN_NOISE_INVALID)) {
1580 snr_a = MIN(wa->level - wa->noise, GREAT_SNR);
1581 snr_b = MIN(wb->level - wb->noise, GREAT_SNR);
1582 } else {
1583 /* Not suitable information to calculate SNR, so use level */
1584 snr_a = wa->level;
1585 snr_b = wb->level;
1586 }
1587
1588 /* best/max rate preferred if SNR close enough */
1589 if ((snr_a && snr_b && abs(snr_b - snr_a) < 5) ||
1590 (wa->qual && wb->qual && abs(wb->qual - wa->qual) < 10)) {
1591 maxrate_a = wpa_scan_get_max_rate(wa);
1592 maxrate_b = wpa_scan_get_max_rate(wb);
1593 if (maxrate_a != maxrate_b)
1594 return maxrate_b - maxrate_a;
1595 if (IS_5GHZ(wa->freq) ^ IS_5GHZ(wb->freq))
1596 return IS_5GHZ(wa->freq) ? -1 : 1;
1597 }
1598
1599 /* use freq for channel preference */
1600
1601 /* all things being equal, use SNR; if SNRs are
1602 * identical, use quality values since some drivers may only report
1603 * that value and leave the signal level zero */
1604 if (snr_b == snr_a)
1605 return wb->qual - wa->qual;
1606 return snr_b - snr_a;
1607 #undef MIN
1608 #undef IS_5GHZ
1609 }
1610
1611
1612 #ifdef CONFIG_WPS
1613 /* Compare function for sorting scan results when searching a WPS AP for
1614 * provisioning. Return >0 if @b is considered better. */
wpa_scan_result_wps_compar(const void * a,const void * b)1615 static int wpa_scan_result_wps_compar(const void *a, const void *b)
1616 {
1617 struct wpa_scan_res **_wa = (void *) a;
1618 struct wpa_scan_res **_wb = (void *) b;
1619 struct wpa_scan_res *wa = *_wa;
1620 struct wpa_scan_res *wb = *_wb;
1621 int uses_wps_a, uses_wps_b;
1622 struct wpabuf *wps_a, *wps_b;
1623 int res;
1624
1625 /* Optimization - check WPS IE existence before allocated memory and
1626 * doing full reassembly. */
1627 uses_wps_a = wpa_scan_get_vendor_ie(wa, WPS_IE_VENDOR_TYPE) != NULL;
1628 uses_wps_b = wpa_scan_get_vendor_ie(wb, WPS_IE_VENDOR_TYPE) != NULL;
1629 if (uses_wps_a && !uses_wps_b)
1630 return -1;
1631 if (!uses_wps_a && uses_wps_b)
1632 return 1;
1633
1634 if (uses_wps_a && uses_wps_b) {
1635 wps_a = wpa_scan_get_vendor_ie_multi(wa, WPS_IE_VENDOR_TYPE);
1636 wps_b = wpa_scan_get_vendor_ie_multi(wb, WPS_IE_VENDOR_TYPE);
1637 res = wps_ap_priority_compar(wps_a, wps_b);
1638 wpabuf_free(wps_a);
1639 wpabuf_free(wps_b);
1640 if (res)
1641 return res;
1642 }
1643
1644 /*
1645 * Do not use current AP security policy as a sorting criteria during
1646 * WPS provisioning step since the AP may get reconfigured at the
1647 * completion of provisioning.
1648 */
1649
1650 /* all things being equal, use signal level; if signal levels are
1651 * identical, use quality values since some drivers may only report
1652 * that value and leave the signal level zero */
1653 if (wb->level == wa->level)
1654 return wb->qual - wa->qual;
1655 return wb->level - wa->level;
1656 }
1657 #endif /* CONFIG_WPS */
1658
1659
dump_scan_res(struct wpa_scan_results * scan_res)1660 static void dump_scan_res(struct wpa_scan_results *scan_res)
1661 {
1662 #ifndef CONFIG_NO_STDOUT_DEBUG
1663 size_t i;
1664
1665 if (scan_res->res == NULL || scan_res->num == 0)
1666 return;
1667
1668 wpa_printf(MSG_EXCESSIVE, "Sorted scan results");
1669
1670 for (i = 0; i < scan_res->num; i++) {
1671 struct wpa_scan_res *r = scan_res->res[i];
1672 u8 *pos;
1673 if ((r->flags & (WPA_SCAN_LEVEL_DBM | WPA_SCAN_NOISE_INVALID))
1674 == WPA_SCAN_LEVEL_DBM) {
1675 int snr = r->level - r->noise;
1676 wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d "
1677 "noise=%d level=%d snr=%d%s flags=0x%x "
1678 "age=%u",
1679 MAC2STR(r->bssid), r->freq, r->qual,
1680 r->noise, r->level, snr,
1681 snr >= GREAT_SNR ? "*" : "", r->flags,
1682 r->age);
1683 } else {
1684 wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d "
1685 "noise=%d level=%d flags=0x%x age=%u",
1686 MAC2STR(r->bssid), r->freq, r->qual,
1687 r->noise, r->level, r->flags, r->age);
1688 }
1689 pos = (u8 *) (r + 1);
1690 if (r->ie_len)
1691 wpa_hexdump(MSG_EXCESSIVE, "IEs", pos, r->ie_len);
1692 pos += r->ie_len;
1693 if (r->beacon_ie_len)
1694 wpa_hexdump(MSG_EXCESSIVE, "Beacon IEs",
1695 pos, r->beacon_ie_len);
1696 }
1697 #endif /* CONFIG_NO_STDOUT_DEBUG */
1698 }
1699
1700
1701 /**
1702 * wpa_supplicant_filter_bssid_match - Is the specified BSSID allowed
1703 * @wpa_s: Pointer to wpa_supplicant data
1704 * @bssid: BSSID to check
1705 * Returns: 0 if the BSSID is filtered or 1 if not
1706 *
1707 * This function is used to filter out specific BSSIDs from scan reslts mainly
1708 * for testing purposes (SET bssid_filter ctrl_iface command).
1709 */
wpa_supplicant_filter_bssid_match(struct wpa_supplicant * wpa_s,const u8 * bssid)1710 int wpa_supplicant_filter_bssid_match(struct wpa_supplicant *wpa_s,
1711 const u8 *bssid)
1712 {
1713 size_t i;
1714
1715 if (wpa_s->bssid_filter == NULL)
1716 return 1;
1717
1718 for (i = 0; i < wpa_s->bssid_filter_count; i++) {
1719 if (os_memcmp(wpa_s->bssid_filter + i * ETH_ALEN, bssid,
1720 ETH_ALEN) == 0)
1721 return 1;
1722 }
1723
1724 return 0;
1725 }
1726
1727
filter_scan_res(struct wpa_supplicant * wpa_s,struct wpa_scan_results * res)1728 static void filter_scan_res(struct wpa_supplicant *wpa_s,
1729 struct wpa_scan_results *res)
1730 {
1731 size_t i, j;
1732
1733 if (wpa_s->bssid_filter == NULL)
1734 return;
1735
1736 for (i = 0, j = 0; i < res->num; i++) {
1737 if (wpa_supplicant_filter_bssid_match(wpa_s,
1738 res->res[i]->bssid)) {
1739 res->res[j++] = res->res[i];
1740 } else {
1741 os_free(res->res[i]);
1742 res->res[i] = NULL;
1743 }
1744 }
1745
1746 if (res->num != j) {
1747 wpa_printf(MSG_DEBUG, "Filtered out %d scan results",
1748 (int) (res->num - j));
1749 res->num = j;
1750 }
1751 }
1752
1753
1754 /**
1755 * wpa_supplicant_get_scan_results - Get scan results
1756 * @wpa_s: Pointer to wpa_supplicant data
1757 * @info: Information about what was scanned or %NULL if not available
1758 * @new_scan: Whether a new scan was performed
1759 * Returns: Scan results, %NULL on failure
1760 *
1761 * This function request the current scan results from the driver and updates
1762 * the local BSS list wpa_s->bss. The caller is responsible for freeing the
1763 * results with wpa_scan_results_free().
1764 */
1765 struct wpa_scan_results *
wpa_supplicant_get_scan_results(struct wpa_supplicant * wpa_s,struct scan_info * info,int new_scan)1766 wpa_supplicant_get_scan_results(struct wpa_supplicant *wpa_s,
1767 struct scan_info *info, int new_scan)
1768 {
1769 struct wpa_scan_results *scan_res;
1770 size_t i;
1771 int (*compar)(const void *, const void *) = wpa_scan_result_compar;
1772
1773 scan_res = wpa_drv_get_scan_results2(wpa_s);
1774 if (scan_res == NULL) {
1775 wpa_dbg(wpa_s, MSG_DEBUG, "Failed to get scan results");
1776 return NULL;
1777 }
1778 if (scan_res->fetch_time.sec == 0) {
1779 /*
1780 * Make sure we have a valid timestamp if the driver wrapper
1781 * does not set this.
1782 */
1783 os_get_reltime(&scan_res->fetch_time);
1784 }
1785 filter_scan_res(wpa_s, scan_res);
1786
1787 #ifdef CONFIG_WPS
1788 if (wpas_wps_searching(wpa_s)) {
1789 wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Order scan results with WPS "
1790 "provisioning rules");
1791 compar = wpa_scan_result_wps_compar;
1792 }
1793 #endif /* CONFIG_WPS */
1794
1795 qsort(scan_res->res, scan_res->num, sizeof(struct wpa_scan_res *),
1796 compar);
1797 dump_scan_res(scan_res);
1798
1799 wpa_bss_update_start(wpa_s);
1800 for (i = 0; i < scan_res->num; i++)
1801 wpa_bss_update_scan_res(wpa_s, scan_res->res[i],
1802 &scan_res->fetch_time);
1803 wpa_bss_update_end(wpa_s, info, new_scan);
1804
1805 return scan_res;
1806 }
1807
1808
1809 /**
1810 * wpa_supplicant_update_scan_results - Update scan results from the driver
1811 * @wpa_s: Pointer to wpa_supplicant data
1812 * Returns: 0 on success, -1 on failure
1813 *
1814 * This function updates the BSS table within wpa_supplicant based on the
1815 * currently available scan results from the driver without requesting a new
1816 * scan. This is used in cases where the driver indicates an association
1817 * (including roaming within ESS) and wpa_supplicant does not yet have the
1818 * needed information to complete the connection (e.g., to perform validation
1819 * steps in 4-way handshake).
1820 */
wpa_supplicant_update_scan_results(struct wpa_supplicant * wpa_s)1821 int wpa_supplicant_update_scan_results(struct wpa_supplicant *wpa_s)
1822 {
1823 struct wpa_scan_results *scan_res;
1824 scan_res = wpa_supplicant_get_scan_results(wpa_s, NULL, 0);
1825 if (scan_res == NULL)
1826 return -1;
1827 wpa_scan_results_free(scan_res);
1828
1829 return 0;
1830 }
1831
1832
1833 /**
1834 * scan_only_handler - Reports scan results
1835 */
scan_only_handler(struct wpa_supplicant * wpa_s,struct wpa_scan_results * scan_res)1836 void scan_only_handler(struct wpa_supplicant *wpa_s,
1837 struct wpa_scan_results *scan_res)
1838 {
1839 wpa_dbg(wpa_s, MSG_DEBUG, "Scan-only results received");
1840 if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
1841 wpa_s->manual_scan_use_id && wpa_s->own_scan_running) {
1842 wpa_msg_ctrl(wpa_s, MSG_INFO, WPA_EVENT_SCAN_RESULTS "id=%u",
1843 wpa_s->manual_scan_id);
1844 wpa_s->manual_scan_use_id = 0;
1845 } else {
1846 wpa_msg_ctrl(wpa_s, MSG_INFO, WPA_EVENT_SCAN_RESULTS);
1847 }
1848 wpas_notify_scan_results(wpa_s);
1849 wpas_notify_scan_done(wpa_s, 1);
1850 if (wpa_s->scan_work) {
1851 struct wpa_radio_work *work = wpa_s->scan_work;
1852 wpa_s->scan_work = NULL;
1853 radio_work_done(work);
1854 }
1855 }
1856
1857
wpas_scan_scheduled(struct wpa_supplicant * wpa_s)1858 int wpas_scan_scheduled(struct wpa_supplicant *wpa_s)
1859 {
1860 return eloop_is_timeout_registered(wpa_supplicant_scan, wpa_s, NULL);
1861 }
1862
1863
1864 struct wpa_driver_scan_params *
wpa_scan_clone_params(const struct wpa_driver_scan_params * src)1865 wpa_scan_clone_params(const struct wpa_driver_scan_params *src)
1866 {
1867 struct wpa_driver_scan_params *params;
1868 size_t i;
1869 u8 *n;
1870
1871 params = os_zalloc(sizeof(*params));
1872 if (params == NULL)
1873 return NULL;
1874
1875 for (i = 0; i < src->num_ssids; i++) {
1876 if (src->ssids[i].ssid) {
1877 n = os_malloc(src->ssids[i].ssid_len);
1878 if (n == NULL)
1879 goto failed;
1880 os_memcpy(n, src->ssids[i].ssid,
1881 src->ssids[i].ssid_len);
1882 params->ssids[i].ssid = n;
1883 params->ssids[i].ssid_len = src->ssids[i].ssid_len;
1884 }
1885 }
1886 params->num_ssids = src->num_ssids;
1887
1888 if (src->extra_ies) {
1889 n = os_malloc(src->extra_ies_len);
1890 if (n == NULL)
1891 goto failed;
1892 os_memcpy(n, src->extra_ies, src->extra_ies_len);
1893 params->extra_ies = n;
1894 params->extra_ies_len = src->extra_ies_len;
1895 }
1896
1897 if (src->freqs) {
1898 int len = int_array_len(src->freqs);
1899 params->freqs = os_malloc((len + 1) * sizeof(int));
1900 if (params->freqs == NULL)
1901 goto failed;
1902 os_memcpy(params->freqs, src->freqs, (len + 1) * sizeof(int));
1903 }
1904
1905 if (src->filter_ssids) {
1906 params->filter_ssids = os_malloc(sizeof(*params->filter_ssids) *
1907 src->num_filter_ssids);
1908 if (params->filter_ssids == NULL)
1909 goto failed;
1910 os_memcpy(params->filter_ssids, src->filter_ssids,
1911 sizeof(*params->filter_ssids) *
1912 src->num_filter_ssids);
1913 params->num_filter_ssids = src->num_filter_ssids;
1914 }
1915
1916 params->filter_rssi = src->filter_rssi;
1917 params->p2p_probe = src->p2p_probe;
1918 params->only_new_results = src->only_new_results;
1919 params->low_priority = src->low_priority;
1920
1921 return params;
1922
1923 failed:
1924 wpa_scan_free_params(params);
1925 return NULL;
1926 }
1927
1928
wpa_scan_free_params(struct wpa_driver_scan_params * params)1929 void wpa_scan_free_params(struct wpa_driver_scan_params *params)
1930 {
1931 size_t i;
1932
1933 if (params == NULL)
1934 return;
1935
1936 for (i = 0; i < params->num_ssids; i++)
1937 os_free((u8 *) params->ssids[i].ssid);
1938 os_free((u8 *) params->extra_ies);
1939 os_free(params->freqs);
1940 os_free(params->filter_ssids);
1941 os_free(params);
1942 }
1943
1944
wpas_start_pno(struct wpa_supplicant * wpa_s)1945 int wpas_start_pno(struct wpa_supplicant *wpa_s)
1946 {
1947 int ret, interval;
1948 size_t i, num_ssid, num_match_ssid;
1949 struct wpa_ssid *ssid;
1950 struct wpa_driver_scan_params params;
1951
1952 if (!wpa_s->sched_scan_supported)
1953 return -1;
1954
1955 if (wpa_s->pno || wpa_s->pno_sched_pending)
1956 return 0;
1957
1958 if ((wpa_s->wpa_state > WPA_SCANNING) &&
1959 (wpa_s->wpa_state <= WPA_COMPLETED)) {
1960 wpa_printf(MSG_ERROR, "PNO: In assoc process");
1961 return -EAGAIN;
1962 }
1963
1964 if (wpa_s->wpa_state == WPA_SCANNING) {
1965 wpa_supplicant_cancel_scan(wpa_s);
1966 if (wpa_s->sched_scanning) {
1967 wpa_printf(MSG_DEBUG, "Schedule PNO on completion of "
1968 "ongoing sched scan");
1969 wpa_supplicant_cancel_sched_scan(wpa_s);
1970 wpa_s->pno_sched_pending = 1;
1971 return 0;
1972 }
1973 }
1974
1975 os_memset(¶ms, 0, sizeof(params));
1976
1977 num_ssid = num_match_ssid = 0;
1978 ssid = wpa_s->conf->ssid;
1979 while (ssid) {
1980 if (!wpas_network_disabled(wpa_s, ssid)) {
1981 num_match_ssid++;
1982 if (ssid->scan_ssid)
1983 num_ssid++;
1984 }
1985 ssid = ssid->next;
1986 }
1987
1988 if (num_match_ssid == 0) {
1989 wpa_printf(MSG_DEBUG, "PNO: No configured SSIDs");
1990 return -1;
1991 }
1992
1993 if (num_match_ssid > num_ssid) {
1994 params.num_ssids++; /* wildcard */
1995 num_ssid++;
1996 }
1997
1998 if (num_ssid > WPAS_MAX_SCAN_SSIDS) {
1999 wpa_printf(MSG_DEBUG, "PNO: Use only the first %u SSIDs from "
2000 "%u", WPAS_MAX_SCAN_SSIDS, (unsigned int) num_ssid);
2001 num_ssid = WPAS_MAX_SCAN_SSIDS;
2002 }
2003
2004 if (num_match_ssid > wpa_s->max_match_sets) {
2005 num_match_ssid = wpa_s->max_match_sets;
2006 wpa_dbg(wpa_s, MSG_DEBUG, "PNO: Too many SSIDs to match");
2007 }
2008 params.filter_ssids = os_calloc(num_match_ssid,
2009 sizeof(struct wpa_driver_scan_filter));
2010 if (params.filter_ssids == NULL)
2011 return -1;
2012 i = 0;
2013 ssid = wpa_s->conf->ssid;
2014 while (ssid) {
2015 if (!wpas_network_disabled(wpa_s, ssid)) {
2016 if (ssid->scan_ssid && params.num_ssids < num_ssid) {
2017 params.ssids[params.num_ssids].ssid =
2018 ssid->ssid;
2019 params.ssids[params.num_ssids].ssid_len =
2020 ssid->ssid_len;
2021 params.num_ssids++;
2022 }
2023 os_memcpy(params.filter_ssids[i].ssid, ssid->ssid,
2024 ssid->ssid_len);
2025 params.filter_ssids[i].ssid_len = ssid->ssid_len;
2026 params.num_filter_ssids++;
2027 i++;
2028 if (i == num_match_ssid)
2029 break;
2030 }
2031 ssid = ssid->next;
2032 }
2033
2034 if (wpa_s->conf->filter_rssi)
2035 params.filter_rssi = wpa_s->conf->filter_rssi;
2036
2037 interval = wpa_s->conf->sched_scan_interval ?
2038 wpa_s->conf->sched_scan_interval : 10;
2039
2040 if (params.freqs == NULL && wpa_s->manual_sched_scan_freqs) {
2041 wpa_dbg(wpa_s, MSG_DEBUG, "Limit sched scan to specified channels");
2042 params.freqs = wpa_s->manual_sched_scan_freqs;
2043 }
2044
2045 ret = wpa_supplicant_start_sched_scan(wpa_s, ¶ms, interval);
2046 os_free(params.filter_ssids);
2047 if (ret == 0)
2048 wpa_s->pno = 1;
2049 else
2050 wpa_msg(wpa_s, MSG_ERROR, "Failed to schedule PNO");
2051 return ret;
2052 }
2053
2054
wpas_stop_pno(struct wpa_supplicant * wpa_s)2055 int wpas_stop_pno(struct wpa_supplicant *wpa_s)
2056 {
2057 int ret = 0;
2058
2059 if (!wpa_s->pno)
2060 return 0;
2061
2062 ret = wpa_supplicant_stop_sched_scan(wpa_s);
2063
2064 wpa_s->pno = 0;
2065 wpa_s->pno_sched_pending = 0;
2066
2067 if (wpa_s->wpa_state == WPA_SCANNING)
2068 wpa_supplicant_req_scan(wpa_s, 0, 0);
2069
2070 return ret;
2071 }
2072