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