Line data Source code
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 :
27 2 : 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 2 : ssid = wpa_supplicant_get_ssid(wpa_s);
33 2 : if (ssid == NULL)
34 3 : return;
35 :
36 1 : if (wpa_s->current_ssid == NULL) {
37 0 : wpa_s->current_ssid = ssid;
38 0 : if (wpa_s->current_ssid != NULL)
39 0 : wpas_notify_network_changed(wpa_s);
40 : }
41 1 : wpa_supplicant_initiate_eapol(wpa_s);
42 1 : wpa_dbg(wpa_s, MSG_DEBUG, "Already associated with a configured "
43 : "network - generating associated event");
44 1 : os_memset(&data, 0, sizeof(data));
45 1 : wpa_supplicant_event(wpa_s, EVENT_ASSOC, &data);
46 : }
47 :
48 :
49 : #ifdef CONFIG_WPS
50 1185 : 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 1185 : int wps = 0;
55 :
56 2072 : for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
57 974 : if (!(ssid->key_mgmt & WPA_KEY_MGMT_WPS))
58 665 : continue;
59 :
60 309 : wps = 1;
61 309 : *req_type = wpas_wps_get_req_type(ssid);
62 309 : if (!ssid->eap.phase1)
63 0 : continue;
64 :
65 309 : if (os_strstr(ssid->eap.phase1, "pbc=1"))
66 87 : return 2;
67 : }
68 :
69 : #ifdef CONFIG_P2P
70 2194 : if (!wpa_s->global->p2p_disabled && wpa_s->global->p2p &&
71 1096 : !wpa_s->conf->p2p_disabled) {
72 1096 : wpa_s->wps->dev.p2p = 1;
73 1096 : if (!wps) {
74 875 : wps = 1;
75 875 : *req_type = WPS_REQ_ENROLLEE_INFO;
76 : }
77 : }
78 : #endif /* CONFIG_P2P */
79 :
80 1098 : 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 : */
94 2555 : int wpa_supplicant_enabled_networks(struct wpa_supplicant *wpa_s)
95 : {
96 2555 : struct wpa_ssid *ssid = wpa_s->conf->ssid;
97 2555 : int count = 0, disabled = 0;
98 6839 : while (ssid) {
99 1729 : if (!wpas_network_disabled(wpa_s, ssid))
100 1661 : count++;
101 : else
102 68 : disabled++;
103 1729 : ssid = ssid->next;
104 : }
105 2804 : if (wpa_s->conf->cred && wpa_s->conf->interworking &&
106 249 : wpa_s->conf->auto_interworking)
107 1 : count++;
108 2555 : if (count == 0 && disabled > 0) {
109 4 : wpa_dbg(wpa_s, MSG_DEBUG, "No enabled networks (%d disabled "
110 : "networks)", disabled);
111 : }
112 2555 : return count;
113 : }
114 :
115 :
116 4 : static void wpa_supplicant_assoc_try(struct wpa_supplicant *wpa_s,
117 : struct wpa_ssid *ssid)
118 : {
119 8 : while (ssid) {
120 4 : if (!wpas_network_disabled(wpa_s, ssid))
121 4 : break;
122 0 : ssid = ssid->next;
123 : }
124 :
125 : /* ap_scan=2 mode - try to associate with each SSID. */
126 4 : if (ssid == NULL) {
127 0 : wpa_dbg(wpa_s, MSG_DEBUG, "wpa_supplicant_assoc_try: Reached "
128 : "end of scan list - go back to beginning");
129 0 : wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
130 0 : wpa_supplicant_req_scan(wpa_s, 0, 0);
131 4 : return;
132 : }
133 4 : if (ssid->next) {
134 : /* Continue from the next SSID on the next attempt. */
135 0 : wpa_s->prev_scan_ssid = ssid;
136 : } else {
137 : /* Start from the beginning of the SSID list. */
138 4 : wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
139 : }
140 4 : wpa_supplicant_associate(wpa_s, NULL, ssid);
141 : }
142 :
143 :
144 1201 : static void wpas_trigger_scan_cb(struct wpa_radio_work *work, int deinit)
145 : {
146 1201 : struct wpa_supplicant *wpa_s = work->wpa_s;
147 1201 : struct wpa_driver_scan_params *params = work->ctx;
148 : int ret;
149 :
150 1201 : if (deinit) {
151 4 : if (!work->started) {
152 0 : wpa_scan_free_params(params);
153 0 : return;
154 : }
155 4 : wpa_supplicant_notify_scanning(wpa_s, 0);
156 4 : wpas_notify_scan_done(wpa_s, 0);
157 4 : wpa_s->scan_work = NULL;
158 4 : return;
159 : }
160 :
161 1197 : wpa_supplicant_notify_scanning(wpa_s, 1);
162 :
163 1197 : if (wpa_s->clear_driver_scan_cache)
164 734 : params->only_new_results = 1;
165 1197 : ret = wpa_drv_scan(wpa_s, params);
166 1197 : wpa_scan_free_params(params);
167 1197 : work->ctx = NULL;
168 1197 : if (ret) {
169 1 : wpa_supplicant_notify_scanning(wpa_s, 0);
170 1 : wpas_notify_scan_done(wpa_s, 0);
171 1 : radio_work_done(work);
172 1 : return;
173 : }
174 :
175 1196 : os_get_reltime(&wpa_s->scan_trigger_time);
176 1196 : wpa_s->scan_runs++;
177 1196 : wpa_s->normal_scans++;
178 1196 : wpa_s->own_scan_requested = 1;
179 1196 : wpa_s->clear_driver_scan_cache = 0;
180 1196 : 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 : */
190 1197 : 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 1197 : if (wpa_s->scan_work) {
196 0 : wpa_dbg(wpa_s, MSG_INFO, "Reject scan trigger since one is already pending");
197 0 : return -1;
198 : }
199 :
200 1197 : ctx = wpa_scan_clone_params(params);
201 1197 : if (ctx == NULL)
202 0 : return -1;
203 :
204 1197 : if (radio_add_work(wpa_s, 0, "scan", 0, wpas_trigger_scan_cb, ctx) < 0)
205 : {
206 0 : wpa_scan_free_params(ctx);
207 0 : return -1;
208 : }
209 :
210 1197 : return 0;
211 : }
212 :
213 :
214 : static void
215 0 : wpa_supplicant_delayed_sched_scan_timeout(void *eloop_ctx, void *timeout_ctx)
216 : {
217 0 : struct wpa_supplicant *wpa_s = eloop_ctx;
218 :
219 0 : wpa_dbg(wpa_s, MSG_DEBUG, "Starting delayed sched scan");
220 :
221 0 : if (wpa_supplicant_req_sched_scan(wpa_s))
222 0 : wpa_supplicant_req_scan(wpa_s, 0, 0);
223 0 : }
224 :
225 :
226 : static void
227 0 : wpa_supplicant_sched_scan_timeout(void *eloop_ctx, void *timeout_ctx)
228 : {
229 0 : struct wpa_supplicant *wpa_s = eloop_ctx;
230 :
231 0 : wpa_dbg(wpa_s, MSG_DEBUG, "Sched scan timeout - stopping it");
232 :
233 0 : wpa_s->sched_scan_timed_out = 1;
234 0 : wpa_supplicant_cancel_sched_scan(wpa_s);
235 0 : }
236 :
237 :
238 0 : 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 0 : wpa_supplicant_notify_scanning(wpa_s, 1);
245 0 : ret = wpa_drv_sched_scan(wpa_s, params, interval * 1000);
246 0 : if (ret)
247 0 : wpa_supplicant_notify_scanning(wpa_s, 0);
248 : else
249 0 : wpa_s->sched_scanning = 1;
250 :
251 0 : return ret;
252 : }
253 :
254 :
255 0 : int wpa_supplicant_stop_sched_scan(struct wpa_supplicant *wpa_s)
256 : {
257 : int ret;
258 :
259 0 : ret = wpa_drv_stop_sched_scan(wpa_s);
260 0 : if (ret) {
261 0 : wpa_dbg(wpa_s, MSG_DEBUG, "stopping sched_scan failed!");
262 : /* TODO: what to do if stopping fails? */
263 0 : return -1;
264 : }
265 :
266 0 : return ret;
267 : }
268 :
269 :
270 : static struct wpa_driver_scan_filter *
271 1185 : 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 1185 : *num_ssids = 0;
278 1185 : if (!conf->filter_ssids)
279 1184 : return NULL;
280 :
281 2 : for (count = 0, ssid = conf->ssid; ssid; ssid = ssid->next) {
282 1 : if (ssid->ssid && ssid->ssid_len)
283 1 : count++;
284 : }
285 1 : if (count == 0)
286 0 : return NULL;
287 1 : ssids = os_zalloc(count * sizeof(struct wpa_driver_scan_filter));
288 1 : if (ssids == NULL)
289 0 : return NULL;
290 :
291 2 : for (ssid = conf->ssid; ssid; ssid = ssid->next) {
292 1 : if (!ssid->ssid || !ssid->ssid_len)
293 0 : continue;
294 1 : os_memcpy(ssids[*num_ssids].ssid, ssid->ssid, ssid->ssid_len);
295 1 : ssids[*num_ssids].ssid_len = ssid->ssid_len;
296 1 : (*num_ssids)++;
297 : }
298 :
299 1 : return ssids;
300 : }
301 :
302 :
303 1185 : static void wpa_supplicant_optimize_freqs(
304 : struct wpa_supplicant *wpa_s, struct wpa_driver_scan_params *params)
305 : {
306 : #ifdef CONFIG_P2P
307 1340 : if (params->freqs == NULL && wpa_s->p2p_in_provisioning &&
308 155 : wpa_s->go_params) {
309 : /* Optimize provisioning state scan based on GO information */
310 305 : if (wpa_s->p2p_in_provisioning < 5 &&
311 151 : wpa_s->go_params->freq > 0) {
312 151 : wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only GO "
313 : "preferred frequency %d MHz",
314 : wpa_s->go_params->freq);
315 151 : params->freqs = os_zalloc(2 * sizeof(int));
316 302 : if (params->freqs)
317 151 : params->freqs[0] = wpa_s->go_params->freq;
318 6 : } else if (wpa_s->p2p_in_provisioning < 8 &&
319 3 : wpa_s->go_params->freq_list[0]) {
320 0 : wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only common "
321 : "channels");
322 0 : int_array_concat(¶ms->freqs,
323 0 : wpa_s->go_params->freq_list);
324 0 : if (params->freqs)
325 0 : int_array_sort_unique(params->freqs);
326 : }
327 154 : wpa_s->p2p_in_provisioning++;
328 : }
329 :
330 1185 : if (params->freqs == NULL && wpa_s->p2p_in_invitation) {
331 : /*
332 : * Optimize scan based on GO information during persistent
333 : * group reinvocation
334 : */
335 18 : if (wpa_s->p2p_in_invitation < 5 &&
336 9 : wpa_s->p2p_invite_go_freq > 0) {
337 7 : wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only GO preferred frequency %d MHz during invitation",
338 : wpa_s->p2p_invite_go_freq);
339 7 : params->freqs = os_zalloc(2 * sizeof(int));
340 7 : if (params->freqs)
341 7 : params->freqs[0] = wpa_s->p2p_invite_go_freq;
342 : }
343 9 : wpa_s->p2p_in_invitation++;
344 9 : 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 0 : wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Clear p2p_in_invitation");
352 0 : wpa_s->p2p_in_invitation = 0;
353 : }
354 : }
355 : #endif /* CONFIG_P2P */
356 :
357 : #ifdef CONFIG_WPS
358 1185 : 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 32 : wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Scan only frequency %u MHz "
364 : "that was used during provisioning", wpa_s->wps_freq);
365 32 : params->freqs = os_zalloc(2 * sizeof(int));
366 32 : if (params->freqs)
367 32 : params->freqs[0] = wpa_s->wps_freq;
368 32 : wpa_s->after_wps--;
369 1153 : } else if (wpa_s->after_wps)
370 1 : wpa_s->after_wps--;
371 :
372 1185 : if (params->freqs == NULL && wpa_s->known_wps_freq && wpa_s->wps_freq)
373 : {
374 : /* Optimize provisioning scan based on already known channel */
375 17 : wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Scan only frequency %u MHz",
376 : wpa_s->wps_freq);
377 17 : params->freqs = os_zalloc(2 * sizeof(int));
378 17 : if (params->freqs)
379 17 : params->freqs[0] = wpa_s->wps_freq;
380 17 : wpa_s->known_wps_freq = 0; /* only do this once */
381 : }
382 : #endif /* CONFIG_WPS */
383 1185 : }
384 :
385 :
386 : #ifdef CONFIG_INTERWORKING
387 298 : static void wpas_add_interworking_elements(struct wpa_supplicant *wpa_s,
388 : struct wpabuf *buf)
389 : {
390 298 : if (wpa_s->conf->interworking == 0)
391 298 : return;
392 :
393 298 : wpabuf_put_u8(buf, WLAN_EID_EXT_CAPAB);
394 298 : wpabuf_put_u8(buf, 6);
395 298 : wpabuf_put_u8(buf, 0x00);
396 298 : wpabuf_put_u8(buf, 0x00);
397 298 : wpabuf_put_u8(buf, 0x00);
398 298 : wpabuf_put_u8(buf, 0x80); /* Bit 31 - Interworking */
399 298 : wpabuf_put_u8(buf, 0x00);
400 : #ifdef CONFIG_HS20
401 298 : wpabuf_put_u8(buf, 0x40); /* Bit 46 - WNM-Notification */
402 : #else /* CONFIG_HS20 */
403 : wpabuf_put_u8(buf, 0x00);
404 : #endif /* CONFIG_HS20 */
405 :
406 298 : wpabuf_put_u8(buf, WLAN_EID_INTERWORKING);
407 298 : wpabuf_put_u8(buf, is_zero_ether_addr(wpa_s->conf->hessid) ? 1 :
408 : 1 + ETH_ALEN);
409 298 : wpabuf_put_u8(buf, wpa_s->conf->access_network_type);
410 : /* No Venue Info */
411 298 : if (!is_zero_ether_addr(wpa_s->conf->hessid))
412 4 : wpabuf_put_data(buf, wpa_s->conf->hessid, ETH_ALEN);
413 : }
414 : #endif /* CONFIG_INTERWORKING */
415 :
416 :
417 1185 : static struct wpabuf * wpa_supplicant_extra_ies(struct wpa_supplicant *wpa_s)
418 : {
419 1185 : struct wpabuf *extra_ie = NULL;
420 : #ifdef CONFIG_WPS
421 1185 : int wps = 0;
422 1185 : enum wps_request_type req_type = WPS_REQ_ENROLLEE_INFO;
423 : #endif /* CONFIG_WPS */
424 :
425 : #ifdef CONFIG_INTERWORKING
426 1483 : if (wpa_s->conf->interworking &&
427 298 : wpabuf_resize(&extra_ie, 100) == 0)
428 298 : wpas_add_interworking_elements(wpa_s, extra_ie);
429 : #endif /* CONFIG_INTERWORKING */
430 :
431 : #ifdef CONFIG_WPS
432 1185 : wps = wpas_wps_in_use(wpa_s, &req_type);
433 :
434 1185 : if (wps) {
435 : struct wpabuf *wps_ie;
436 2368 : wps_ie = wps_build_probe_req_ie(wps == 2 ? DEV_PW_PUSHBUTTON :
437 : DEV_PW_DEFAULT,
438 1184 : &wpa_s->wps->dev,
439 1184 : wpa_s->wps->uuid, req_type,
440 : 0, NULL);
441 1184 : if (wps_ie) {
442 1184 : if (wpabuf_resize(&extra_ie, wpabuf_len(wps_ie)) == 0)
443 1184 : wpabuf_put_buf(extra_ie, wps_ie);
444 1184 : wpabuf_free(wps_ie);
445 : }
446 : }
447 :
448 : #ifdef CONFIG_P2P
449 1185 : if (wps) {
450 1184 : size_t ielen = p2p_scan_ie_buf_len(wpa_s->global->p2p);
451 1184 : if (wpabuf_resize(&extra_ie, ielen) == 0)
452 1184 : wpas_p2p_scan_ie(wpa_s, extra_ie);
453 : }
454 : #endif /* CONFIG_P2P */
455 :
456 : #endif /* CONFIG_WPS */
457 :
458 : #ifdef CONFIG_HS20
459 1185 : if (wpa_s->conf->hs20 && wpabuf_resize(&extra_ie, 7) == 0)
460 298 : wpas_hs20_add_indication(extra_ie, -1);
461 : #endif /* CONFIG_HS20 */
462 :
463 1185 : 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 : */
473 58 : static int non_p2p_network_enabled(struct wpa_supplicant *wpa_s)
474 : {
475 : struct wpa_ssid *ssid;
476 :
477 58 : for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
478 58 : if (wpas_network_disabled(wpa_s, ssid))
479 0 : continue;
480 58 : if (!ssid->p2p_group)
481 58 : return 1;
482 : }
483 :
484 0 : if (wpa_s->conf->cred && wpa_s->conf->interworking &&
485 0 : wpa_s->conf->auto_interworking)
486 0 : return 1;
487 :
488 0 : return 0;
489 : }
490 :
491 : #endif /* CONFIG_P2P */
492 :
493 :
494 0 : 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 0 : for (i = 0; i < num_modes; i++) {
501 0 : if (modes[i].mode == mode)
502 0 : return &modes[i];
503 : }
504 :
505 0 : return NULL;
506 : }
507 :
508 :
509 0 : 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 0 : mode = get_mode(wpa_s->hw.modes, wpa_s->hw.num_modes, band);
518 0 : if (mode == NULL) {
519 : /* No channels supported in this band - use empty list */
520 0 : params->freqs = os_zalloc(sizeof(int));
521 0 : return;
522 : }
523 :
524 0 : params->freqs = os_zalloc((mode->num_channels + 1) * sizeof(int));
525 0 : if (params->freqs == NULL)
526 0 : return;
527 0 : for (count = 0, i = 0; i < mode->num_channels; i++) {
528 0 : if (mode->channels[i].flag & HOSTAPD_CHAN_DISABLED)
529 0 : continue;
530 0 : params->freqs[count++] = mode->channels[i].freq;
531 : }
532 : }
533 :
534 :
535 1185 : static void wpa_setband_scan_freqs(struct wpa_supplicant *wpa_s,
536 : struct wpa_driver_scan_params *params)
537 : {
538 1185 : if (wpa_s->hw.modes == NULL)
539 0 : return; /* unknown what channels the driver supports */
540 1185 : if (params->freqs)
541 1009 : return; /* already using a limited channel set */
542 176 : if (wpa_s->setband == WPA_SETBAND_5G)
543 0 : wpa_setband_scan_freqs_list(wpa_s, HOSTAPD_MODE_IEEE80211A,
544 : params);
545 176 : else if (wpa_s->setband == WPA_SETBAND_2G)
546 0 : wpa_setband_scan_freqs_list(wpa_s, HOSTAPD_MODE_IEEE80211G,
547 : params);
548 : }
549 :
550 :
551 1795 : static void wpa_supplicant_scan(void *eloop_ctx, void *timeout_ctx)
552 : {
553 1795 : struct wpa_supplicant *wpa_s = eloop_ctx;
554 : struct wpa_ssid *ssid;
555 : int ret;
556 1795 : struct wpabuf *extra_ie = NULL;
557 : struct wpa_driver_scan_params params;
558 : struct wpa_driver_scan_params *scan_params;
559 : size_t max_ssids;
560 : enum wpa_states prev_state;
561 :
562 1795 : if (wpa_s->pno || wpa_s->pno_sched_pending) {
563 0 : wpa_dbg(wpa_s, MSG_DEBUG, "Skip scan - PNO is in progress");
564 0 : return;
565 : }
566 :
567 1795 : if (wpa_s->wpa_state == WPA_INTERFACE_DISABLED) {
568 0 : wpa_dbg(wpa_s, MSG_DEBUG, "Skip scan - interface disabled");
569 0 : return;
570 : }
571 :
572 1795 : if (wpa_s->disconnected && wpa_s->scan_req == NORMAL_SCAN_REQ) {
573 0 : wpa_dbg(wpa_s, MSG_DEBUG, "Disconnected - do not scan");
574 0 : wpa_supplicant_set_state(wpa_s, WPA_DISCONNECTED);
575 0 : return;
576 : }
577 :
578 1795 : if (wpa_s->scanning) {
579 : /*
580 : * If we are already in scanning state, we shall reschedule the
581 : * the incoming scan request.
582 : */
583 0 : wpa_dbg(wpa_s, MSG_DEBUG, "Already scanning - Reschedule the incoming scan req");
584 0 : wpa_supplicant_req_scan(wpa_s, 1, 0);
585 0 : return;
586 : }
587 :
588 2513 : if (!wpa_supplicant_enabled_networks(wpa_s) &&
589 718 : wpa_s->scan_req == NORMAL_SCAN_REQ) {
590 485 : wpa_dbg(wpa_s, MSG_DEBUG, "No enabled networks - do not scan");
591 485 : wpa_supplicant_set_state(wpa_s, WPA_INACTIVE);
592 485 : return;
593 : }
594 :
595 2618 : if (wpa_s->conf->ap_scan != 0 &&
596 1308 : (wpa_s->drv_flags & WPA_DRIVER_FLAGS_WIRED)) {
597 0 : wpa_dbg(wpa_s, MSG_DEBUG, "Using wired authentication - "
598 : "overriding ap_scan configuration");
599 0 : wpa_s->conf->ap_scan = 0;
600 0 : wpas_notify_ap_scan_changed(wpa_s);
601 : }
602 :
603 1310 : if (wpa_s->conf->ap_scan == 0) {
604 2 : wpa_supplicant_gen_assoc_event(wpa_s);
605 2 : return;
606 : }
607 :
608 : #ifdef CONFIG_P2P
609 1308 : if (wpas_p2p_in_progress(wpa_s)) {
610 1 : wpa_dbg(wpa_s, MSG_DEBUG, "Delay station mode scan while P2P operation is in progress");
611 1 : wpa_supplicant_req_scan(wpa_s, 5, 0);
612 1 : return;
613 : }
614 : #endif /* CONFIG_P2P */
615 :
616 1307 : if (wpa_s->conf->ap_scan == 2)
617 4 : max_ssids = 1;
618 : else {
619 1303 : max_ssids = wpa_s->max_scan_ssids;
620 1303 : if (max_ssids > WPAS_MAX_SCAN_SSIDS)
621 0 : max_ssids = WPAS_MAX_SCAN_SSIDS;
622 : }
623 :
624 1307 : wpa_s->last_scan_req = wpa_s->scan_req;
625 1307 : wpa_s->scan_req = NORMAL_SCAN_REQ;
626 :
627 1307 : os_memset(¶ms, 0, sizeof(params));
628 :
629 1307 : prev_state = wpa_s->wpa_state;
630 2106 : if (wpa_s->wpa_state == WPA_DISCONNECTED ||
631 799 : wpa_s->wpa_state == WPA_INACTIVE)
632 1091 : wpa_supplicant_set_state(wpa_s, WPA_SCANNING);
633 :
634 : /*
635 : * If autoscan has set its own scanning parameters
636 : */
637 1307 : if (wpa_s->autoscan_params != NULL) {
638 0 : scan_params = wpa_s->autoscan_params;
639 0 : goto scan;
640 : }
641 :
642 2330 : if (wpa_s->last_scan_req != MANUAL_SCAN_REQ &&
643 1023 : wpa_s->connect_without_scan) {
644 135 : for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
645 135 : if (ssid == wpa_s->connect_without_scan)
646 118 : break;
647 : }
648 118 : wpa_s->connect_without_scan = NULL;
649 118 : if (ssid) {
650 118 : wpa_printf(MSG_DEBUG, "Start a pre-selected network "
651 : "without scan step");
652 118 : wpa_supplicant_associate(wpa_s, NULL, ssid);
653 118 : return;
654 : }
655 : }
656 :
657 : #ifdef CONFIG_P2P
658 1353 : if ((wpa_s->p2p_in_provisioning || wpa_s->show_group_started) &&
659 164 : wpa_s->go_params) {
660 154 : wpa_printf(MSG_DEBUG, "P2P: Use specific SSID for scan during P2P group formation (p2p_in_provisioning=%d show_group_started=%d)",
661 : wpa_s->p2p_in_provisioning,
662 : wpa_s->show_group_started);
663 154 : params.ssids[0].ssid = wpa_s->go_params->ssid;
664 154 : params.ssids[0].ssid_len = wpa_s->go_params->ssid_len;
665 154 : params.num_ssids = 1;
666 154 : goto ssid_list_set;
667 : }
668 :
669 1035 : if (wpa_s->p2p_in_invitation) {
670 9 : if (wpa_s->current_ssid) {
671 4 : wpa_printf(MSG_DEBUG, "P2P: Use specific SSID for scan during invitation");
672 4 : params.ssids[0].ssid = wpa_s->current_ssid->ssid;
673 4 : params.ssids[0].ssid_len =
674 4 : wpa_s->current_ssid->ssid_len;
675 4 : params.num_ssids = 1;
676 : } else {
677 5 : wpa_printf(MSG_DEBUG, "P2P: No specific SSID known for scan during invitation");
678 : }
679 9 : goto ssid_list_set;
680 : }
681 : #endif /* CONFIG_P2P */
682 :
683 : /* Find the starting point from which to continue scanning */
684 1026 : ssid = wpa_s->conf->ssid;
685 1026 : if (wpa_s->prev_scan_ssid != WILDCARD_SSID_SCAN) {
686 2 : while (ssid) {
687 1 : if (ssid == wpa_s->prev_scan_ssid) {
688 1 : ssid = ssid->next;
689 1 : break;
690 : }
691 0 : ssid = ssid->next;
692 : }
693 : }
694 :
695 1768 : if (wpa_s->last_scan_req != MANUAL_SCAN_REQ &&
696 742 : wpa_s->conf->ap_scan == 2) {
697 4 : wpa_s->connect_without_scan = NULL;
698 4 : wpa_s->prev_scan_wildcard = 0;
699 4 : wpa_supplicant_assoc_try(wpa_s, ssid);
700 4 : return;
701 1022 : } else if (wpa_s->conf->ap_scan == 2) {
702 : /*
703 : * User-initiated scan request in ap_scan == 2; scan with
704 : * wildcard SSID.
705 : */
706 0 : ssid = NULL;
707 1022 : } else if (wpa_s->reattach && wpa_s->current_ssid != NULL) {
708 : /*
709 : * Perform single-channel single-SSID scan for
710 : * reassociate-to-same-BSS operation.
711 : */
712 : /* Setup SSID */
713 1 : ssid = wpa_s->current_ssid;
714 2 : wpa_hexdump_ascii(MSG_DEBUG, "Scan SSID",
715 1 : ssid->ssid, ssid->ssid_len);
716 1 : params.ssids[0].ssid = ssid->ssid;
717 1 : params.ssids[0].ssid_len = ssid->ssid_len;
718 1 : params.num_ssids = 1;
719 :
720 : /*
721 : * Allocate memory for frequency array, allocate one extra
722 : * slot for the zero-terminator.
723 : */
724 1 : params.freqs = os_malloc(sizeof(int) * 2);
725 1 : if (params.freqs == NULL) {
726 0 : wpa_dbg(wpa_s, MSG_ERROR, "Memory allocation failed");
727 0 : return;
728 : }
729 1 : params.freqs[0] = wpa_s->assoc_freq;
730 1 : params.freqs[1] = 0;
731 :
732 : /*
733 : * Reset the reattach flag so that we fall back to full scan if
734 : * this scan fails.
735 : */
736 1 : wpa_s->reattach = 0;
737 : } else {
738 1021 : struct wpa_ssid *start = ssid, *tssid;
739 1021 : int freqs_set = 0;
740 1021 : if (ssid == NULL && max_ssids > 1)
741 233 : ssid = wpa_s->conf->ssid;
742 2841 : while (ssid) {
743 1591 : if (!wpas_network_disabled(wpa_s, ssid) &&
744 791 : ssid->scan_ssid) {
745 6 : wpa_hexdump_ascii(MSG_DEBUG, "Scan SSID",
746 3 : ssid->ssid, ssid->ssid_len);
747 6 : params.ssids[params.num_ssids].ssid =
748 3 : ssid->ssid;
749 6 : params.ssids[params.num_ssids].ssid_len =
750 3 : ssid->ssid_len;
751 3 : params.num_ssids++;
752 3 : if (params.num_ssids + 1 >= max_ssids)
753 0 : break;
754 : }
755 800 : ssid = ssid->next;
756 800 : if (ssid == start)
757 1 : break;
758 1587 : if (ssid == NULL && max_ssids > 1 &&
759 788 : start != wpa_s->conf->ssid)
760 0 : ssid = wpa_s->conf->ssid;
761 : }
762 :
763 1821 : for (tssid = wpa_s->conf->ssid; tssid; tssid = tssid->next) {
764 800 : if (wpas_network_disabled(wpa_s, tssid))
765 9 : continue;
766 791 : if ((params.freqs || !freqs_set) && tssid->scan_freq) {
767 536 : int_array_concat(¶ms.freqs,
768 536 : tssid->scan_freq);
769 : } else {
770 255 : os_free(params.freqs);
771 255 : params.freqs = NULL;
772 : }
773 791 : freqs_set = 1;
774 : }
775 1021 : int_array_sort_unique(params.freqs);
776 : }
777 :
778 1022 : if (ssid && max_ssids == 1) {
779 : /*
780 : * If the driver is limited to 1 SSID at a time interleave
781 : * wildcard SSID scans with specific SSID scans to avoid
782 : * waiting a long time for a wildcard scan.
783 : */
784 0 : if (!wpa_s->prev_scan_wildcard) {
785 0 : params.ssids[0].ssid = NULL;
786 0 : params.ssids[0].ssid_len = 0;
787 0 : wpa_s->prev_scan_wildcard = 1;
788 0 : wpa_dbg(wpa_s, MSG_DEBUG, "Starting AP scan for "
789 : "wildcard SSID (Interleave with specific)");
790 : } else {
791 0 : wpa_s->prev_scan_ssid = ssid;
792 0 : wpa_s->prev_scan_wildcard = 0;
793 0 : wpa_dbg(wpa_s, MSG_DEBUG,
794 : "Starting AP scan for specific SSID: %s",
795 : wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
796 : }
797 1022 : } else if (ssid) {
798 : /* max_ssids > 1 */
799 :
800 1 : wpa_s->prev_scan_ssid = ssid;
801 1 : wpa_dbg(wpa_s, MSG_DEBUG, "Include wildcard SSID in "
802 : "the scan request");
803 1 : params.num_ssids++;
804 1021 : } else if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
805 2 : wpa_s->manual_scan_passive && params.num_ssids == 0) {
806 2 : wpa_dbg(wpa_s, MSG_DEBUG, "Use passive scan based on manual request");
807 : } else {
808 1019 : wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
809 1019 : params.num_ssids++;
810 1019 : wpa_dbg(wpa_s, MSG_DEBUG, "Starting AP scan for wildcard "
811 : "SSID");
812 : }
813 : #ifdef CONFIG_P2P
814 : ssid_list_set:
815 : #endif /* CONFIG_P2P */
816 :
817 1185 : wpa_supplicant_optimize_freqs(wpa_s, ¶ms);
818 1185 : extra_ie = wpa_supplicant_extra_ies(wpa_s);
819 :
820 1185 : if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
821 : wpa_s->manual_scan_only_new)
822 11 : params.only_new_results = 1;
823 :
824 1450 : if (wpa_s->last_scan_req == MANUAL_SCAN_REQ && params.freqs == NULL &&
825 265 : wpa_s->manual_scan_freqs) {
826 251 : wpa_dbg(wpa_s, MSG_DEBUG, "Limit manual scan to specified channels");
827 251 : params.freqs = wpa_s->manual_scan_freqs;
828 251 : wpa_s->manual_scan_freqs = NULL;
829 : }
830 :
831 1185 : if (params.freqs == NULL && wpa_s->next_scan_freqs) {
832 16 : wpa_dbg(wpa_s, MSG_DEBUG, "Optimize scan based on previously "
833 : "generated frequency list");
834 16 : params.freqs = wpa_s->next_scan_freqs;
835 : } else
836 1169 : os_free(wpa_s->next_scan_freqs);
837 1185 : wpa_s->next_scan_freqs = NULL;
838 1185 : wpa_setband_scan_freqs(wpa_s, ¶ms);
839 :
840 : /* See if user specified frequencies. If so, scan only those. */
841 1185 : if (wpa_s->conf->freq_list && !params.freqs) {
842 0 : wpa_dbg(wpa_s, MSG_DEBUG,
843 : "Optimize scan based on conf->freq_list");
844 0 : int_array_concat(¶ms.freqs, wpa_s->conf->freq_list);
845 : }
846 :
847 : /* Use current associated channel? */
848 1185 : if (wpa_s->conf->scan_cur_freq && !params.freqs) {
849 0 : unsigned int num = wpa_s->num_multichan_concurrent;
850 :
851 0 : params.freqs = os_calloc(num + 1, sizeof(int));
852 0 : if (params.freqs) {
853 0 : num = get_shared_radio_freqs(wpa_s, params.freqs, num);
854 0 : if (num > 0) {
855 0 : wpa_dbg(wpa_s, MSG_DEBUG, "Scan only the "
856 : "current operating channels since "
857 : "scan_cur_freq is enabled");
858 : } else {
859 0 : os_free(params.freqs);
860 0 : params.freqs = NULL;
861 : }
862 : }
863 : }
864 :
865 1185 : params.filter_ssids = wpa_supplicant_build_filter_ssids(
866 : wpa_s->conf, ¶ms.num_filter_ssids);
867 1185 : if (extra_ie) {
868 1184 : params.extra_ies = wpabuf_head(extra_ie);
869 1184 : params.extra_ies_len = wpabuf_len(extra_ie);
870 : }
871 :
872 : #ifdef CONFIG_P2P
873 2206 : if (wpa_s->p2p_in_provisioning || wpa_s->p2p_in_invitation ||
874 1021 : (wpa_s->show_group_started && wpa_s->go_params)) {
875 : /*
876 : * The interface may not yet be in P2P mode, so we have to
877 : * explicitly request P2P probe to disable CCK rates.
878 : */
879 164 : params.p2p_probe = 1;
880 : }
881 : #endif /* CONFIG_P2P */
882 :
883 1185 : scan_params = ¶ms;
884 :
885 : scan:
886 : #ifdef CONFIG_P2P
887 : /*
888 : * If the driver does not support multi-channel concurrency and a
889 : * virtual interface that shares the same radio with the wpa_s interface
890 : * is operating there may not be need to scan other channels apart from
891 : * the current operating channel on the other virtual interface. Filter
892 : * out other channels in case we are trying to find a connection for a
893 : * station interface when we are not configured to prefer station
894 : * connection and a concurrent operation is already in process.
895 : */
896 1374 : if (wpa_s->scan_for_connection &&
897 368 : wpa_s->last_scan_req == NORMAL_SCAN_REQ &&
898 295 : !scan_params->freqs && !params.freqs &&
899 116 : wpas_is_p2p_prioritized(wpa_s) &&
900 116 : wpa_s->p2p_group_interface == NOT_P2P_GROUP_INTERFACE &&
901 58 : non_p2p_network_enabled(wpa_s)) {
902 58 : unsigned int num = wpa_s->num_multichan_concurrent;
903 :
904 58 : params.freqs = os_calloc(num + 1, sizeof(int));
905 58 : if (params.freqs) {
906 58 : num = get_shared_radio_freqs(wpa_s, params.freqs, num);
907 58 : if (num > 0 && num == wpa_s->num_multichan_concurrent) {
908 0 : wpa_dbg(wpa_s, MSG_DEBUG, "Scan only the current operating channels since all channels are already used");
909 : } else {
910 58 : os_free(params.freqs);
911 58 : params.freqs = NULL;
912 : }
913 : }
914 : }
915 : #endif /* CONFIG_P2P */
916 :
917 1185 : ret = wpa_supplicant_trigger_scan(wpa_s, scan_params);
918 :
919 1185 : if (ret && wpa_s->last_scan_req == MANUAL_SCAN_REQ && params.freqs &&
920 0 : !wpa_s->manual_scan_freqs) {
921 : /* Restore manual_scan_freqs for the next attempt */
922 0 : wpa_s->manual_scan_freqs = params.freqs;
923 0 : params.freqs = NULL;
924 : }
925 :
926 1185 : wpabuf_free(extra_ie);
927 1185 : os_free(params.freqs);
928 1185 : os_free(params.filter_ssids);
929 :
930 1185 : if (ret) {
931 0 : wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate AP scan");
932 0 : if (prev_state != wpa_s->wpa_state)
933 0 : wpa_supplicant_set_state(wpa_s, prev_state);
934 : /* Restore scan_req since we will try to scan again */
935 0 : wpa_s->scan_req = wpa_s->last_scan_req;
936 0 : wpa_supplicant_req_scan(wpa_s, 1, 0);
937 : } else {
938 1185 : wpa_s->scan_for_connection = 0;
939 : }
940 : }
941 :
942 :
943 2 : void wpa_supplicant_update_scan_int(struct wpa_supplicant *wpa_s, int sec)
944 : {
945 : struct os_reltime remaining, new_int;
946 : int cancelled;
947 :
948 2 : cancelled = eloop_cancel_timeout_one(wpa_supplicant_scan, wpa_s, NULL,
949 : &remaining);
950 :
951 2 : new_int.sec = sec;
952 2 : new_int.usec = 0;
953 2 : if (cancelled && os_reltime_before(&remaining, &new_int)) {
954 1 : new_int.sec = remaining.sec;
955 1 : new_int.usec = remaining.usec;
956 : }
957 :
958 2 : if (cancelled) {
959 1 : eloop_register_timeout(new_int.sec, new_int.usec,
960 : wpa_supplicant_scan, wpa_s, NULL);
961 : }
962 2 : wpa_s->scan_interval = sec;
963 2 : }
964 :
965 :
966 : /**
967 : * wpa_supplicant_req_scan - Schedule a scan for neighboring access points
968 : * @wpa_s: Pointer to wpa_supplicant data
969 : * @sec: Number of seconds after which to scan
970 : * @usec: Number of microseconds after which to scan
971 : *
972 : * This function is used to schedule a scan for neighboring access points after
973 : * the specified time.
974 : */
975 3062 : void wpa_supplicant_req_scan(struct wpa_supplicant *wpa_s, int sec, int usec)
976 : {
977 3062 : int res = eloop_deplete_timeout(sec, usec, wpa_supplicant_scan, wpa_s,
978 : NULL);
979 3062 : if (res == 1) {
980 89 : wpa_dbg(wpa_s, MSG_DEBUG, "Rescheduling scan request: %d.%06d sec",
981 : sec, usec);
982 2973 : } else if (res == 0) {
983 878 : wpa_dbg(wpa_s, MSG_DEBUG, "Ignore new scan request for %d.%06d sec since an earlier request is scheduled to trigger sooner",
984 : sec, usec);
985 : } else {
986 2095 : wpa_dbg(wpa_s, MSG_DEBUG, "Setting scan request: %d.%06d sec",
987 : sec, usec);
988 2095 : eloop_register_timeout(sec, usec, wpa_supplicant_scan, wpa_s, NULL);
989 : }
990 3062 : }
991 :
992 :
993 : /**
994 : * wpa_supplicant_delayed_sched_scan - Request a delayed scheduled scan
995 : * @wpa_s: Pointer to wpa_supplicant data
996 : * @sec: Number of seconds after which to scan
997 : * @usec: Number of microseconds after which to scan
998 : * Returns: 0 on success or -1 otherwise
999 : *
1000 : * This function is used to schedule periodic scans for neighboring
1001 : * access points after the specified time.
1002 : */
1003 0 : int wpa_supplicant_delayed_sched_scan(struct wpa_supplicant *wpa_s,
1004 : int sec, int usec)
1005 : {
1006 0 : if (!wpa_s->sched_scan_supported)
1007 0 : return -1;
1008 :
1009 0 : eloop_register_timeout(sec, usec,
1010 : wpa_supplicant_delayed_sched_scan_timeout,
1011 : wpa_s, NULL);
1012 :
1013 0 : return 0;
1014 : }
1015 :
1016 :
1017 : /**
1018 : * wpa_supplicant_req_sched_scan - Start a periodic scheduled scan
1019 : * @wpa_s: Pointer to wpa_supplicant data
1020 : * Returns: 0 is sched_scan was started or -1 otherwise
1021 : *
1022 : * This function is used to schedule periodic scans for neighboring
1023 : * access points repeating the scan continuously.
1024 : */
1025 205 : int wpa_supplicant_req_sched_scan(struct wpa_supplicant *wpa_s)
1026 : {
1027 : struct wpa_driver_scan_params params;
1028 : struct wpa_driver_scan_params *scan_params;
1029 : enum wpa_states prev_state;
1030 205 : struct wpa_ssid *ssid = NULL;
1031 205 : struct wpabuf *extra_ie = NULL;
1032 : int ret;
1033 : unsigned int max_sched_scan_ssids;
1034 205 : int wildcard = 0;
1035 : int need_ssids;
1036 :
1037 205 : if (!wpa_s->sched_scan_supported)
1038 205 : return -1;
1039 :
1040 0 : if (wpa_s->max_sched_scan_ssids > WPAS_MAX_SCAN_SSIDS)
1041 0 : max_sched_scan_ssids = WPAS_MAX_SCAN_SSIDS;
1042 : else
1043 0 : max_sched_scan_ssids = wpa_s->max_sched_scan_ssids;
1044 0 : if (max_sched_scan_ssids < 1 || wpa_s->conf->disable_scan_offload)
1045 0 : return -1;
1046 :
1047 0 : if (wpa_s->sched_scanning) {
1048 0 : wpa_dbg(wpa_s, MSG_DEBUG, "Already sched scanning");
1049 0 : return 0;
1050 : }
1051 :
1052 0 : need_ssids = 0;
1053 0 : for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
1054 0 : if (!wpas_network_disabled(wpa_s, ssid) && !ssid->scan_ssid) {
1055 : /* Use wildcard SSID to find this network */
1056 0 : wildcard = 1;
1057 0 : } else if (!wpas_network_disabled(wpa_s, ssid) &&
1058 0 : ssid->ssid_len)
1059 0 : need_ssids++;
1060 :
1061 : #ifdef CONFIG_WPS
1062 0 : if (!wpas_network_disabled(wpa_s, ssid) &&
1063 0 : ssid->key_mgmt == WPA_KEY_MGMT_WPS) {
1064 : /*
1065 : * Normal scan is more reliable and faster for WPS
1066 : * operations and since these are for short periods of
1067 : * time, the benefit of trying to use sched_scan would
1068 : * be limited.
1069 : */
1070 0 : wpa_dbg(wpa_s, MSG_DEBUG, "Use normal scan instead of "
1071 : "sched_scan for WPS");
1072 0 : return -1;
1073 : }
1074 : #endif /* CONFIG_WPS */
1075 : }
1076 0 : if (wildcard)
1077 0 : need_ssids++;
1078 :
1079 0 : if (wpa_s->normal_scans < 3 &&
1080 0 : (need_ssids <= wpa_s->max_scan_ssids ||
1081 0 : wpa_s->max_scan_ssids >= (int) max_sched_scan_ssids)) {
1082 : /*
1083 : * When normal scan can speed up operations, use that for the
1084 : * first operations before starting the sched_scan to allow
1085 : * user space sleep more. We do this only if the normal scan
1086 : * has functionality that is suitable for this or if the
1087 : * sched_scan does not have better support for multiple SSIDs.
1088 : */
1089 0 : wpa_dbg(wpa_s, MSG_DEBUG, "Use normal scan instead of "
1090 : "sched_scan for initial scans (normal_scans=%d)",
1091 : wpa_s->normal_scans);
1092 0 : return -1;
1093 : }
1094 :
1095 0 : os_memset(¶ms, 0, sizeof(params));
1096 :
1097 : /* If we can't allocate space for the filters, we just don't filter */
1098 0 : params.filter_ssids = os_zalloc(wpa_s->max_match_sets *
1099 : sizeof(struct wpa_driver_scan_filter));
1100 :
1101 0 : prev_state = wpa_s->wpa_state;
1102 0 : if (wpa_s->wpa_state == WPA_DISCONNECTED ||
1103 0 : wpa_s->wpa_state == WPA_INACTIVE)
1104 0 : wpa_supplicant_set_state(wpa_s, WPA_SCANNING);
1105 :
1106 0 : if (wpa_s->autoscan_params != NULL) {
1107 0 : scan_params = wpa_s->autoscan_params;
1108 0 : goto scan;
1109 : }
1110 :
1111 : /* Find the starting point from which to continue scanning */
1112 0 : ssid = wpa_s->conf->ssid;
1113 0 : if (wpa_s->prev_sched_ssid) {
1114 0 : while (ssid) {
1115 0 : if (ssid == wpa_s->prev_sched_ssid) {
1116 0 : ssid = ssid->next;
1117 0 : break;
1118 : }
1119 0 : ssid = ssid->next;
1120 : }
1121 : }
1122 :
1123 0 : if (!ssid || !wpa_s->prev_sched_ssid) {
1124 0 : wpa_dbg(wpa_s, MSG_DEBUG, "Beginning of SSID list");
1125 0 : if (wpa_s->conf->sched_scan_interval)
1126 0 : wpa_s->sched_scan_interval =
1127 0 : wpa_s->conf->sched_scan_interval;
1128 0 : if (wpa_s->sched_scan_interval == 0)
1129 0 : wpa_s->sched_scan_interval = 10;
1130 0 : wpa_s->sched_scan_timeout = max_sched_scan_ssids * 2;
1131 0 : wpa_s->first_sched_scan = 1;
1132 0 : ssid = wpa_s->conf->ssid;
1133 0 : wpa_s->prev_sched_ssid = ssid;
1134 : }
1135 :
1136 0 : if (wildcard) {
1137 0 : wpa_dbg(wpa_s, MSG_DEBUG, "Add wildcard SSID to sched_scan");
1138 0 : params.num_ssids++;
1139 : }
1140 :
1141 0 : while (ssid) {
1142 0 : if (wpas_network_disabled(wpa_s, ssid))
1143 0 : goto next;
1144 :
1145 0 : if (params.num_filter_ssids < wpa_s->max_match_sets &&
1146 0 : params.filter_ssids && ssid->ssid && ssid->ssid_len) {
1147 0 : wpa_dbg(wpa_s, MSG_DEBUG, "add to filter ssid: %s",
1148 : wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
1149 0 : os_memcpy(params.filter_ssids[params.num_filter_ssids].ssid,
1150 : ssid->ssid, ssid->ssid_len);
1151 0 : params.filter_ssids[params.num_filter_ssids].ssid_len =
1152 0 : ssid->ssid_len;
1153 0 : params.num_filter_ssids++;
1154 0 : } else if (params.filter_ssids && ssid->ssid && ssid->ssid_len)
1155 : {
1156 0 : wpa_dbg(wpa_s, MSG_DEBUG, "Not enough room for SSID "
1157 : "filter for sched_scan - drop filter");
1158 0 : os_free(params.filter_ssids);
1159 0 : params.filter_ssids = NULL;
1160 0 : params.num_filter_ssids = 0;
1161 : }
1162 :
1163 0 : if (ssid->scan_ssid && ssid->ssid && ssid->ssid_len) {
1164 0 : if (params.num_ssids == max_sched_scan_ssids)
1165 0 : break; /* only room for broadcast SSID */
1166 0 : wpa_dbg(wpa_s, MSG_DEBUG,
1167 : "add to active scan ssid: %s",
1168 : wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
1169 0 : params.ssids[params.num_ssids].ssid =
1170 0 : ssid->ssid;
1171 0 : params.ssids[params.num_ssids].ssid_len =
1172 0 : ssid->ssid_len;
1173 0 : params.num_ssids++;
1174 0 : if (params.num_ssids >= max_sched_scan_ssids) {
1175 0 : wpa_s->prev_sched_ssid = ssid;
1176 : do {
1177 0 : ssid = ssid->next;
1178 0 : } while (ssid &&
1179 0 : (wpas_network_disabled(wpa_s, ssid) ||
1180 0 : !ssid->scan_ssid));
1181 0 : break;
1182 : }
1183 : }
1184 :
1185 : next:
1186 0 : wpa_s->prev_sched_ssid = ssid;
1187 0 : ssid = ssid->next;
1188 : }
1189 :
1190 0 : if (params.num_filter_ssids == 0) {
1191 0 : os_free(params.filter_ssids);
1192 0 : params.filter_ssids = NULL;
1193 : }
1194 :
1195 0 : extra_ie = wpa_supplicant_extra_ies(wpa_s);
1196 0 : if (extra_ie) {
1197 0 : params.extra_ies = wpabuf_head(extra_ie);
1198 0 : params.extra_ies_len = wpabuf_len(extra_ie);
1199 : }
1200 :
1201 0 : if (wpa_s->conf->filter_rssi)
1202 0 : params.filter_rssi = wpa_s->conf->filter_rssi;
1203 :
1204 0 : scan_params = ¶ms;
1205 :
1206 : scan:
1207 0 : if (ssid || !wpa_s->first_sched_scan) {
1208 0 : wpa_dbg(wpa_s, MSG_DEBUG,
1209 : "Starting sched scan: interval %d timeout %d",
1210 : wpa_s->sched_scan_interval, wpa_s->sched_scan_timeout);
1211 : } else {
1212 0 : wpa_dbg(wpa_s, MSG_DEBUG,
1213 : "Starting sched scan: interval %d (no timeout)",
1214 : wpa_s->sched_scan_interval);
1215 : }
1216 :
1217 0 : wpa_setband_scan_freqs(wpa_s, scan_params);
1218 :
1219 0 : ret = wpa_supplicant_start_sched_scan(wpa_s, scan_params,
1220 : wpa_s->sched_scan_interval);
1221 0 : wpabuf_free(extra_ie);
1222 0 : os_free(params.filter_ssids);
1223 0 : if (ret) {
1224 0 : wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate sched scan");
1225 0 : if (prev_state != wpa_s->wpa_state)
1226 0 : wpa_supplicant_set_state(wpa_s, prev_state);
1227 0 : return ret;
1228 : }
1229 :
1230 : /* If we have more SSIDs to scan, add a timeout so we scan them too */
1231 0 : if (ssid || !wpa_s->first_sched_scan) {
1232 0 : wpa_s->sched_scan_timed_out = 0;
1233 0 : eloop_register_timeout(wpa_s->sched_scan_timeout, 0,
1234 : wpa_supplicant_sched_scan_timeout,
1235 : wpa_s, NULL);
1236 0 : wpa_s->first_sched_scan = 0;
1237 0 : wpa_s->sched_scan_timeout /= 2;
1238 0 : wpa_s->sched_scan_interval *= 2;
1239 0 : if (wpa_s->sched_scan_timeout < wpa_s->sched_scan_interval) {
1240 0 : wpa_s->sched_scan_interval = 10;
1241 0 : wpa_s->sched_scan_timeout = max_sched_scan_ssids * 2;
1242 : }
1243 : }
1244 :
1245 : /* If there is no more ssids, start next time from the beginning */
1246 0 : if (!ssid)
1247 0 : wpa_s->prev_sched_ssid = NULL;
1248 :
1249 0 : return 0;
1250 : }
1251 :
1252 :
1253 : /**
1254 : * wpa_supplicant_cancel_scan - Cancel a scheduled scan request
1255 : * @wpa_s: Pointer to wpa_supplicant data
1256 : *
1257 : * This function is used to cancel a scan request scheduled with
1258 : * wpa_supplicant_req_scan().
1259 : */
1260 3122 : void wpa_supplicant_cancel_scan(struct wpa_supplicant *wpa_s)
1261 : {
1262 3122 : wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling scan request");
1263 3122 : eloop_cancel_timeout(wpa_supplicant_scan, wpa_s, NULL);
1264 3122 : }
1265 :
1266 :
1267 : /**
1268 : * wpa_supplicant_cancel_delayed_sched_scan - Stop a delayed scheduled scan
1269 : * @wpa_s: Pointer to wpa_supplicant data
1270 : *
1271 : * This function is used to stop a delayed scheduled scan.
1272 : */
1273 78 : void wpa_supplicant_cancel_delayed_sched_scan(struct wpa_supplicant *wpa_s)
1274 : {
1275 78 : if (!wpa_s->sched_scan_supported)
1276 156 : return;
1277 :
1278 0 : wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling delayed sched scan");
1279 0 : eloop_cancel_timeout(wpa_supplicant_delayed_sched_scan_timeout,
1280 : wpa_s, NULL);
1281 : }
1282 :
1283 :
1284 : /**
1285 : * wpa_supplicant_cancel_sched_scan - Stop running scheduled scans
1286 : * @wpa_s: Pointer to wpa_supplicant data
1287 : *
1288 : * This function is used to stop a periodic scheduled scan.
1289 : */
1290 2263 : void wpa_supplicant_cancel_sched_scan(struct wpa_supplicant *wpa_s)
1291 : {
1292 2263 : if (!wpa_s->sched_scanning)
1293 4526 : return;
1294 :
1295 0 : wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling sched scan");
1296 0 : eloop_cancel_timeout(wpa_supplicant_sched_scan_timeout, wpa_s, NULL);
1297 0 : wpa_supplicant_stop_sched_scan(wpa_s);
1298 : }
1299 :
1300 :
1301 : /**
1302 : * wpa_supplicant_notify_scanning - Indicate possible scan state change
1303 : * @wpa_s: Pointer to wpa_supplicant data
1304 : * @scanning: Whether scanning is currently in progress
1305 : *
1306 : * This function is to generate scanning notifycations. It is called whenever
1307 : * there may have been a change in scanning (scan started, completed, stopped).
1308 : * wpas_notify_scanning() is called whenever the scanning state changed from the
1309 : * previously notified state.
1310 : */
1311 12240 : void wpa_supplicant_notify_scanning(struct wpa_supplicant *wpa_s,
1312 : int scanning)
1313 : {
1314 12240 : if (wpa_s->scanning != scanning) {
1315 2394 : wpa_s->scanning = scanning;
1316 2394 : wpas_notify_scanning(wpa_s);
1317 : }
1318 12240 : }
1319 :
1320 :
1321 876 : static int wpa_scan_get_max_rate(const struct wpa_scan_res *res)
1322 : {
1323 876 : int rate = 0;
1324 : const u8 *ie;
1325 : int i;
1326 :
1327 876 : ie = wpa_scan_get_ie(res, WLAN_EID_SUPP_RATES);
1328 7884 : for (i = 0; ie && i < ie[1]; i++) {
1329 7008 : if ((ie[i + 2] & 0x7f) > rate)
1330 6076 : rate = ie[i + 2] & 0x7f;
1331 : }
1332 :
1333 876 : ie = wpa_scan_get_ie(res, WLAN_EID_EXT_SUPP_RATES);
1334 2740 : for (i = 0; ie && i < ie[1]; i++) {
1335 1864 : if ((ie[i + 2] & 0x7f) > rate)
1336 1864 : rate = ie[i + 2] & 0x7f;
1337 : }
1338 :
1339 876 : return rate;
1340 : }
1341 :
1342 :
1343 : /**
1344 : * wpa_scan_get_ie - Fetch a specified information element from a scan result
1345 : * @res: Scan result entry
1346 : * @ie: Information element identitifier (WLAN_EID_*)
1347 : * Returns: Pointer to the information element (id field) or %NULL if not found
1348 : *
1349 : * This function returns the first matching information element in the scan
1350 : * result.
1351 : */
1352 5962 : const u8 * wpa_scan_get_ie(const struct wpa_scan_res *res, u8 ie)
1353 : {
1354 : const u8 *end, *pos;
1355 :
1356 5962 : pos = (const u8 *) (res + 1);
1357 5962 : end = pos + res->ie_len;
1358 :
1359 29448 : while (pos + 1 < end) {
1360 22003 : if (pos + 2 + pos[1] > end)
1361 0 : break;
1362 22003 : if (pos[0] == ie)
1363 4479 : return pos;
1364 17524 : pos += 2 + pos[1];
1365 : }
1366 :
1367 1483 : return NULL;
1368 : }
1369 :
1370 :
1371 : /**
1372 : * wpa_scan_get_vendor_ie - Fetch vendor information element from a scan result
1373 : * @res: Scan result entry
1374 : * @vendor_type: Vendor type (four octets starting the IE payload)
1375 : * Returns: Pointer to the information element (id field) or %NULL if not found
1376 : *
1377 : * This function returns the first matching information element in the scan
1378 : * result.
1379 : */
1380 6383 : const u8 * wpa_scan_get_vendor_ie(const struct wpa_scan_res *res,
1381 : u32 vendor_type)
1382 : {
1383 : const u8 *end, *pos;
1384 :
1385 6383 : pos = (const u8 *) (res + 1);
1386 6383 : end = pos + res->ie_len;
1387 :
1388 70687 : while (pos + 1 < end) {
1389 60005 : if (pos + 2 + pos[1] > end)
1390 0 : break;
1391 72072 : if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1392 12067 : vendor_type == WPA_GET_BE32(&pos[2]))
1393 2084 : return pos;
1394 57921 : pos += 2 + pos[1];
1395 : }
1396 :
1397 4299 : return NULL;
1398 : }
1399 :
1400 :
1401 : /**
1402 : * wpa_scan_get_vendor_ie_beacon - Fetch vendor information from a scan result
1403 : * @res: Scan result entry
1404 : * @vendor_type: Vendor type (four octets starting the IE payload)
1405 : * Returns: Pointer to the information element (id field) or %NULL if not found
1406 : *
1407 : * This function returns the first matching information element in the scan
1408 : * result.
1409 : *
1410 : * This function is like wpa_scan_get_vendor_ie(), but uses IE buffer only
1411 : * from Beacon frames instead of either Beacon or Probe Response frames.
1412 : */
1413 255 : const u8 * wpa_scan_get_vendor_ie_beacon(const struct wpa_scan_res *res,
1414 : u32 vendor_type)
1415 : {
1416 : const u8 *end, *pos;
1417 :
1418 255 : if (res->beacon_ie_len == 0)
1419 0 : return NULL;
1420 :
1421 255 : pos = (const u8 *) (res + 1);
1422 255 : pos += res->ie_len;
1423 255 : end = pos + res->beacon_ie_len;
1424 :
1425 3154 : while (pos + 1 < end) {
1426 2660 : if (pos + 2 + pos[1] > end)
1427 0 : break;
1428 3021 : if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1429 361 : vendor_type == WPA_GET_BE32(&pos[2]))
1430 16 : return pos;
1431 2644 : pos += 2 + pos[1];
1432 : }
1433 :
1434 239 : return NULL;
1435 : }
1436 :
1437 :
1438 : /**
1439 : * wpa_scan_get_vendor_ie_multi - Fetch vendor IE data from a scan result
1440 : * @res: Scan result entry
1441 : * @vendor_type: Vendor type (four octets starting the IE payload)
1442 : * Returns: Pointer to the information element payload or %NULL if not found
1443 : *
1444 : * This function returns concatenated payload of possibly fragmented vendor
1445 : * specific information elements in the scan result. The caller is responsible
1446 : * for freeing the returned buffer.
1447 : */
1448 557 : struct wpabuf * wpa_scan_get_vendor_ie_multi(const struct wpa_scan_res *res,
1449 : u32 vendor_type)
1450 : {
1451 : struct wpabuf *buf;
1452 : const u8 *end, *pos;
1453 :
1454 557 : buf = wpabuf_alloc(res->ie_len);
1455 557 : if (buf == NULL)
1456 0 : return NULL;
1457 :
1458 557 : pos = (const u8 *) (res + 1);
1459 557 : end = pos + res->ie_len;
1460 :
1461 6874 : while (pos + 1 < end) {
1462 5760 : if (pos + 2 + pos[1] > end)
1463 0 : break;
1464 7125 : if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1465 1365 : vendor_type == WPA_GET_BE32(&pos[2]))
1466 543 : wpabuf_put_data(buf, pos + 2 + 4, pos[1] - 4);
1467 5760 : pos += 2 + pos[1];
1468 : }
1469 :
1470 557 : if (wpabuf_len(buf) == 0) {
1471 15 : wpabuf_free(buf);
1472 15 : buf = NULL;
1473 : }
1474 :
1475 557 : return buf;
1476 : }
1477 :
1478 :
1479 : /*
1480 : * Channels with a great SNR can operate at full rate. What is a great SNR?
1481 : * This doc https://supportforums.cisco.com/docs/DOC-12954 says, "the general
1482 : * rule of thumb is that any SNR above 20 is good." This one
1483 : * http://www.cisco.com/en/US/tech/tk722/tk809/technologies_q_and_a_item09186a00805e9a96.shtml#qa23
1484 : * recommends 25 as a minimum SNR for 54 Mbps data rate. 30 is chosen here as a
1485 : * conservative value.
1486 : */
1487 : #define GREAT_SNR 30
1488 :
1489 : /* Compare function for sorting scan results. Return >0 if @b is considered
1490 : * better. */
1491 994 : static int wpa_scan_result_compar(const void *a, const void *b)
1492 : {
1493 : #define IS_5GHZ(n) (n > 4000)
1494 : #define MIN(a,b) a < b ? a : b
1495 994 : struct wpa_scan_res **_wa = (void *) a;
1496 994 : struct wpa_scan_res **_wb = (void *) b;
1497 994 : struct wpa_scan_res *wa = *_wa;
1498 994 : struct wpa_scan_res *wb = *_wb;
1499 : int wpa_a, wpa_b, maxrate_a, maxrate_b;
1500 : int snr_a, snr_b;
1501 :
1502 : /* WPA/WPA2 support preferred */
1503 1936 : wpa_a = wpa_scan_get_vendor_ie(wa, WPA_IE_VENDOR_TYPE) != NULL ||
1504 942 : wpa_scan_get_ie(wa, WLAN_EID_RSN) != NULL;
1505 1964 : wpa_b = wpa_scan_get_vendor_ie(wb, WPA_IE_VENDOR_TYPE) != NULL ||
1506 970 : wpa_scan_get_ie(wb, WLAN_EID_RSN) != NULL;
1507 :
1508 994 : if (wpa_b && !wpa_a)
1509 80 : return 1;
1510 914 : if (!wpa_b && wpa_a)
1511 406 : return -1;
1512 :
1513 : /* privacy support preferred */
1514 684 : if ((wa->caps & IEEE80211_CAP_PRIVACY) == 0 &&
1515 176 : (wb->caps & IEEE80211_CAP_PRIVACY))
1516 56 : return 1;
1517 784 : if ((wa->caps & IEEE80211_CAP_PRIVACY) &&
1518 332 : (wb->caps & IEEE80211_CAP_PRIVACY) == 0)
1519 14 : return -1;
1520 :
1521 876 : if ((wa->flags & wb->flags & WPA_SCAN_LEVEL_DBM) &&
1522 438 : !((wa->flags | wb->flags) & WPA_SCAN_NOISE_INVALID)) {
1523 276 : snr_a = MIN(wa->level - wa->noise, GREAT_SNR);
1524 276 : snr_b = MIN(wb->level - wb->noise, GREAT_SNR);
1525 : } else {
1526 : /* Not suitable information to calculate SNR, so use level */
1527 162 : snr_a = wa->level;
1528 162 : snr_b = wb->level;
1529 : }
1530 :
1531 : /* best/max rate preferred if SNR close enough */
1532 438 : if ((snr_a && snr_b && abs(snr_b - snr_a) < 5) ||
1533 0 : (wa->qual && wb->qual && abs(wb->qual - wa->qual) < 10)) {
1534 438 : maxrate_a = wpa_scan_get_max_rate(wa);
1535 438 : maxrate_b = wpa_scan_get_max_rate(wb);
1536 438 : if (maxrate_a != maxrate_b)
1537 0 : return maxrate_b - maxrate_a;
1538 438 : if (IS_5GHZ(wa->freq) ^ IS_5GHZ(wb->freq))
1539 2 : return IS_5GHZ(wa->freq) ? -1 : 1;
1540 : }
1541 :
1542 : /* use freq for channel preference */
1543 :
1544 : /* all things being equal, use SNR; if SNRs are
1545 : * identical, use quality values since some drivers may only report
1546 : * that value and leave the signal level zero */
1547 436 : if (snr_b == snr_a)
1548 436 : return wb->qual - wa->qual;
1549 0 : return snr_b - snr_a;
1550 : #undef MIN
1551 : #undef IS_5GHZ
1552 : }
1553 :
1554 :
1555 : #ifdef CONFIG_WPS
1556 : /* Compare function for sorting scan results when searching a WPS AP for
1557 : * provisioning. Return >0 if @b is considered better. */
1558 64 : static int wpa_scan_result_wps_compar(const void *a, const void *b)
1559 : {
1560 64 : struct wpa_scan_res **_wa = (void *) a;
1561 64 : struct wpa_scan_res **_wb = (void *) b;
1562 64 : struct wpa_scan_res *wa = *_wa;
1563 64 : struct wpa_scan_res *wb = *_wb;
1564 : int uses_wps_a, uses_wps_b;
1565 : struct wpabuf *wps_a, *wps_b;
1566 : int res;
1567 :
1568 : /* Optimization - check WPS IE existence before allocated memory and
1569 : * doing full reassembly. */
1570 64 : uses_wps_a = wpa_scan_get_vendor_ie(wa, WPS_IE_VENDOR_TYPE) != NULL;
1571 64 : uses_wps_b = wpa_scan_get_vendor_ie(wb, WPS_IE_VENDOR_TYPE) != NULL;
1572 64 : if (uses_wps_a && !uses_wps_b)
1573 0 : return -1;
1574 64 : if (!uses_wps_a && uses_wps_b)
1575 13 : return 1;
1576 :
1577 51 : if (uses_wps_a && uses_wps_b) {
1578 51 : wps_a = wpa_scan_get_vendor_ie_multi(wa, WPS_IE_VENDOR_TYPE);
1579 51 : wps_b = wpa_scan_get_vendor_ie_multi(wb, WPS_IE_VENDOR_TYPE);
1580 51 : res = wps_ap_priority_compar(wps_a, wps_b);
1581 51 : wpabuf_free(wps_a);
1582 51 : wpabuf_free(wps_b);
1583 51 : if (res)
1584 26 : return res;
1585 : }
1586 :
1587 : /*
1588 : * Do not use current AP security policy as a sorting criteria during
1589 : * WPS provisioning step since the AP may get reconfigured at the
1590 : * completion of provisioning.
1591 : */
1592 :
1593 : /* all things being equal, use signal level; if signal levels are
1594 : * identical, use quality values since some drivers may only report
1595 : * that value and leave the signal level zero */
1596 25 : if (wb->level == wa->level)
1597 24 : return wb->qual - wa->qual;
1598 1 : return wb->level - wa->level;
1599 : }
1600 : #endif /* CONFIG_WPS */
1601 :
1602 :
1603 1855 : static void dump_scan_res(struct wpa_scan_results *scan_res)
1604 : {
1605 : #ifndef CONFIG_NO_STDOUT_DEBUG
1606 : size_t i;
1607 :
1608 1855 : if (scan_res->res == NULL || scan_res->num == 0)
1609 1942 : return;
1610 :
1611 1768 : wpa_printf(MSG_EXCESSIVE, "Sorted scan results");
1612 :
1613 4544 : for (i = 0; i < scan_res->num; i++) {
1614 2776 : struct wpa_scan_res *r = scan_res->res[i];
1615 : u8 *pos;
1616 2776 : if ((r->flags & (WPA_SCAN_LEVEL_DBM | WPA_SCAN_NOISE_INVALID))
1617 : == WPA_SCAN_LEVEL_DBM) {
1618 1958 : int snr = r->level - r->noise;
1619 13706 : wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d "
1620 : "noise=%d level=%d snr=%d%s flags=0x%x "
1621 : "age=%u",
1622 11748 : MAC2STR(r->bssid), r->freq, r->qual,
1623 : r->noise, r->level, snr,
1624 : snr >= GREAT_SNR ? "*" : "", r->flags,
1625 : r->age);
1626 : } else {
1627 5726 : wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d "
1628 : "noise=%d level=%d flags=0x%x age=%u",
1629 4908 : MAC2STR(r->bssid), r->freq, r->qual,
1630 : r->noise, r->level, r->flags, r->age);
1631 : }
1632 2776 : pos = (u8 *) (r + 1);
1633 2776 : if (r->ie_len)
1634 2776 : wpa_hexdump(MSG_EXCESSIVE, "IEs", pos, r->ie_len);
1635 2776 : pos += r->ie_len;
1636 2776 : if (r->beacon_ie_len)
1637 1738 : wpa_hexdump(MSG_EXCESSIVE, "Beacon IEs",
1638 : pos, r->beacon_ie_len);
1639 : }
1640 : #endif /* CONFIG_NO_STDOUT_DEBUG */
1641 : }
1642 :
1643 :
1644 : /**
1645 : * wpa_supplicant_filter_bssid_match - Is the specified BSSID allowed
1646 : * @wpa_s: Pointer to wpa_supplicant data
1647 : * @bssid: BSSID to check
1648 : * Returns: 0 if the BSSID is filtered or 1 if not
1649 : *
1650 : * This function is used to filter out specific BSSIDs from scan reslts mainly
1651 : * for testing purposes (SET bssid_filter ctrl_iface command).
1652 : */
1653 2907 : int wpa_supplicant_filter_bssid_match(struct wpa_supplicant *wpa_s,
1654 : const u8 *bssid)
1655 : {
1656 : size_t i;
1657 :
1658 2907 : if (wpa_s->bssid_filter == NULL)
1659 2897 : return 1;
1660 :
1661 13 : for (i = 0; i < wpa_s->bssid_filter_count; i++) {
1662 10 : if (os_memcmp(wpa_s->bssid_filter + i * ETH_ALEN, bssid,
1663 : ETH_ALEN) == 0)
1664 7 : return 1;
1665 : }
1666 :
1667 3 : return 0;
1668 : }
1669 :
1670 :
1671 1855 : static void filter_scan_res(struct wpa_supplicant *wpa_s,
1672 : struct wpa_scan_results *res)
1673 : {
1674 : size_t i, j;
1675 :
1676 1855 : if (wpa_s->bssid_filter == NULL)
1677 3708 : return;
1678 :
1679 6 : for (i = 0, j = 0; i < res->num; i++) {
1680 4 : if (wpa_supplicant_filter_bssid_match(wpa_s,
1681 4 : res->res[i]->bssid)) {
1682 2 : res->res[j++] = res->res[i];
1683 : } else {
1684 2 : os_free(res->res[i]);
1685 2 : res->res[i] = NULL;
1686 : }
1687 : }
1688 :
1689 2 : if (res->num != j) {
1690 2 : wpa_printf(MSG_DEBUG, "Filtered out %d scan results",
1691 2 : (int) (res->num - j));
1692 2 : res->num = j;
1693 : }
1694 : }
1695 :
1696 :
1697 : /**
1698 : * wpa_supplicant_get_scan_results - Get scan results
1699 : * @wpa_s: Pointer to wpa_supplicant data
1700 : * @info: Information about what was scanned or %NULL if not available
1701 : * @new_scan: Whether a new scan was performed
1702 : * Returns: Scan results, %NULL on failure
1703 : *
1704 : * This function request the current scan results from the driver and updates
1705 : * the local BSS list wpa_s->bss. The caller is responsible for freeing the
1706 : * results with wpa_scan_results_free().
1707 : */
1708 : struct wpa_scan_results *
1709 1855 : wpa_supplicant_get_scan_results(struct wpa_supplicant *wpa_s,
1710 : struct scan_info *info, int new_scan)
1711 : {
1712 : struct wpa_scan_results *scan_res;
1713 : size_t i;
1714 1855 : int (*compar)(const void *, const void *) = wpa_scan_result_compar;
1715 :
1716 1855 : scan_res = wpa_drv_get_scan_results2(wpa_s);
1717 1855 : if (scan_res == NULL) {
1718 0 : wpa_dbg(wpa_s, MSG_DEBUG, "Failed to get scan results");
1719 0 : return NULL;
1720 : }
1721 1855 : if (scan_res->fetch_time.sec == 0) {
1722 : /*
1723 : * Make sure we have a valid timestamp if the driver wrapper
1724 : * does not set this.
1725 : */
1726 1855 : os_get_reltime(&scan_res->fetch_time);
1727 : }
1728 1855 : filter_scan_res(wpa_s, scan_res);
1729 :
1730 : #ifdef CONFIG_WPS
1731 1855 : if (wpas_wps_searching(wpa_s)) {
1732 305 : wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Order scan results with WPS "
1733 : "provisioning rules");
1734 305 : compar = wpa_scan_result_wps_compar;
1735 : }
1736 : #endif /* CONFIG_WPS */
1737 :
1738 1855 : qsort(scan_res->res, scan_res->num, sizeof(struct wpa_scan_res *),
1739 : compar);
1740 1855 : dump_scan_res(scan_res);
1741 :
1742 1855 : wpa_bss_update_start(wpa_s);
1743 4631 : for (i = 0; i < scan_res->num; i++)
1744 2776 : wpa_bss_update_scan_res(wpa_s, scan_res->res[i],
1745 : &scan_res->fetch_time);
1746 1855 : wpa_bss_update_end(wpa_s, info, new_scan);
1747 :
1748 1855 : return scan_res;
1749 : }
1750 :
1751 :
1752 : /**
1753 : * wpa_supplicant_update_scan_results - Update scan results from the driver
1754 : * @wpa_s: Pointer to wpa_supplicant data
1755 : * Returns: 0 on success, -1 on failure
1756 : *
1757 : * This function updates the BSS table within wpa_supplicant based on the
1758 : * currently available scan results from the driver without requesting a new
1759 : * scan. This is used in cases where the driver indicates an association
1760 : * (including roaming within ESS) and wpa_supplicant does not yet have the
1761 : * needed information to complete the connection (e.g., to perform validation
1762 : * steps in 4-way handshake).
1763 : */
1764 2 : int wpa_supplicant_update_scan_results(struct wpa_supplicant *wpa_s)
1765 : {
1766 : struct wpa_scan_results *scan_res;
1767 2 : scan_res = wpa_supplicant_get_scan_results(wpa_s, NULL, 0);
1768 2 : if (scan_res == NULL)
1769 0 : return -1;
1770 2 : wpa_scan_results_free(scan_res);
1771 :
1772 2 : return 0;
1773 : }
1774 :
1775 :
1776 : /**
1777 : * scan_only_handler - Reports scan results
1778 : */
1779 5 : void scan_only_handler(struct wpa_supplicant *wpa_s,
1780 : struct wpa_scan_results *scan_res)
1781 : {
1782 5 : wpa_dbg(wpa_s, MSG_DEBUG, "Scan-only results received");
1783 5 : if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
1784 3 : wpa_s->manual_scan_use_id && wpa_s->own_scan_running) {
1785 3 : wpa_msg_ctrl(wpa_s, MSG_INFO, WPA_EVENT_SCAN_RESULTS "id=%u",
1786 : wpa_s->manual_scan_id);
1787 3 : wpa_s->manual_scan_use_id = 0;
1788 : } else {
1789 2 : wpa_msg_ctrl(wpa_s, MSG_INFO, WPA_EVENT_SCAN_RESULTS);
1790 : }
1791 5 : wpas_notify_scan_results(wpa_s);
1792 5 : wpas_notify_scan_done(wpa_s, 1);
1793 5 : if (wpa_s->scan_work) {
1794 5 : struct wpa_radio_work *work = wpa_s->scan_work;
1795 5 : wpa_s->scan_work = NULL;
1796 5 : radio_work_done(work);
1797 : }
1798 5 : }
1799 :
1800 :
1801 0 : int wpas_scan_scheduled(struct wpa_supplicant *wpa_s)
1802 : {
1803 0 : return eloop_is_timeout_registered(wpa_supplicant_scan, wpa_s, NULL);
1804 : }
1805 :
1806 :
1807 : struct wpa_driver_scan_params *
1808 1197 : wpa_scan_clone_params(const struct wpa_driver_scan_params *src)
1809 : {
1810 : struct wpa_driver_scan_params *params;
1811 : size_t i;
1812 : u8 *n;
1813 :
1814 1197 : params = os_zalloc(sizeof(*params));
1815 1197 : if (params == NULL)
1816 0 : return NULL;
1817 :
1818 2385 : for (i = 0; i < src->num_ssids; i++) {
1819 1188 : if (src->ssids[i].ssid) {
1820 168 : n = os_malloc(src->ssids[i].ssid_len);
1821 168 : if (n == NULL)
1822 0 : goto failed;
1823 168 : os_memcpy(n, src->ssids[i].ssid,
1824 : src->ssids[i].ssid_len);
1825 168 : params->ssids[i].ssid = n;
1826 168 : params->ssids[i].ssid_len = src->ssids[i].ssid_len;
1827 : }
1828 : }
1829 1197 : params->num_ssids = src->num_ssids;
1830 :
1831 1197 : if (src->extra_ies) {
1832 1184 : n = os_malloc(src->extra_ies_len);
1833 1184 : if (n == NULL)
1834 0 : goto failed;
1835 1184 : os_memcpy(n, src->extra_ies, src->extra_ies_len);
1836 1184 : params->extra_ies = n;
1837 1184 : params->extra_ies_len = src->extra_ies_len;
1838 : }
1839 :
1840 1197 : if (src->freqs) {
1841 1021 : int len = int_array_len(src->freqs);
1842 1021 : params->freqs = os_malloc((len + 1) * sizeof(int));
1843 1021 : if (params->freqs == NULL)
1844 0 : goto failed;
1845 1021 : os_memcpy(params->freqs, src->freqs, (len + 1) * sizeof(int));
1846 : }
1847 :
1848 1197 : if (src->filter_ssids) {
1849 1 : params->filter_ssids = os_malloc(sizeof(*params->filter_ssids) *
1850 1 : src->num_filter_ssids);
1851 1 : if (params->filter_ssids == NULL)
1852 0 : goto failed;
1853 1 : os_memcpy(params->filter_ssids, src->filter_ssids,
1854 : sizeof(*params->filter_ssids) *
1855 : src->num_filter_ssids);
1856 1 : params->num_filter_ssids = src->num_filter_ssids;
1857 : }
1858 :
1859 1197 : params->filter_rssi = src->filter_rssi;
1860 1197 : params->p2p_probe = src->p2p_probe;
1861 1197 : params->only_new_results = src->only_new_results;
1862 :
1863 1197 : return params;
1864 :
1865 : failed:
1866 0 : wpa_scan_free_params(params);
1867 0 : return NULL;
1868 : }
1869 :
1870 :
1871 1811 : void wpa_scan_free_params(struct wpa_driver_scan_params *params)
1872 : {
1873 : size_t i;
1874 :
1875 1811 : if (params == NULL)
1876 1811 : return;
1877 :
1878 3613 : for (i = 0; i < params->num_ssids; i++)
1879 1802 : os_free((u8 *) params->ssids[i].ssid);
1880 1811 : os_free((u8 *) params->extra_ies);
1881 1811 : os_free(params->freqs);
1882 1811 : os_free(params->filter_ssids);
1883 1811 : os_free(params);
1884 : }
1885 :
1886 :
1887 4 : int wpas_start_pno(struct wpa_supplicant *wpa_s)
1888 : {
1889 : int ret, interval;
1890 : size_t i, num_ssid;
1891 : struct wpa_ssid *ssid;
1892 : struct wpa_driver_scan_params params;
1893 :
1894 4 : if (!wpa_s->sched_scan_supported)
1895 4 : return -1;
1896 :
1897 0 : if (wpa_s->pno || wpa_s->pno_sched_pending)
1898 0 : return 0;
1899 :
1900 0 : if ((wpa_s->wpa_state > WPA_SCANNING) &&
1901 0 : (wpa_s->wpa_state <= WPA_COMPLETED)) {
1902 0 : wpa_printf(MSG_ERROR, "PNO: In assoc process");
1903 0 : return -EAGAIN;
1904 : }
1905 :
1906 0 : if (wpa_s->wpa_state == WPA_SCANNING) {
1907 0 : wpa_supplicant_cancel_scan(wpa_s);
1908 0 : if (wpa_s->sched_scanning) {
1909 0 : wpa_printf(MSG_DEBUG, "Schedule PNO on completion of "
1910 : "ongoing sched scan");
1911 0 : wpa_supplicant_cancel_sched_scan(wpa_s);
1912 0 : wpa_s->pno_sched_pending = 1;
1913 0 : return 0;
1914 : }
1915 : }
1916 :
1917 0 : os_memset(¶ms, 0, sizeof(params));
1918 :
1919 0 : num_ssid = 0;
1920 0 : ssid = wpa_s->conf->ssid;
1921 0 : while (ssid) {
1922 0 : if (!wpas_network_disabled(wpa_s, ssid))
1923 0 : num_ssid++;
1924 0 : ssid = ssid->next;
1925 : }
1926 0 : if (num_ssid > WPAS_MAX_SCAN_SSIDS) {
1927 0 : wpa_printf(MSG_DEBUG, "PNO: Use only the first %u SSIDs from "
1928 : "%u", WPAS_MAX_SCAN_SSIDS, (unsigned int) num_ssid);
1929 0 : num_ssid = WPAS_MAX_SCAN_SSIDS;
1930 : }
1931 :
1932 0 : if (num_ssid == 0) {
1933 0 : wpa_printf(MSG_DEBUG, "PNO: No configured SSIDs");
1934 0 : return -1;
1935 : }
1936 :
1937 0 : params.filter_ssids = os_malloc(sizeof(struct wpa_driver_scan_filter) *
1938 : num_ssid);
1939 0 : if (params.filter_ssids == NULL)
1940 0 : return -1;
1941 0 : i = 0;
1942 0 : ssid = wpa_s->conf->ssid;
1943 0 : while (ssid) {
1944 0 : if (!wpas_network_disabled(wpa_s, ssid)) {
1945 0 : params.ssids[i].ssid = ssid->ssid;
1946 0 : params.ssids[i].ssid_len = ssid->ssid_len;
1947 0 : params.num_ssids++;
1948 0 : os_memcpy(params.filter_ssids[i].ssid, ssid->ssid,
1949 : ssid->ssid_len);
1950 0 : params.filter_ssids[i].ssid_len = ssid->ssid_len;
1951 0 : params.num_filter_ssids++;
1952 0 : i++;
1953 0 : if (i == num_ssid)
1954 0 : break;
1955 : }
1956 0 : ssid = ssid->next;
1957 : }
1958 :
1959 0 : if (wpa_s->conf->filter_rssi)
1960 0 : params.filter_rssi = wpa_s->conf->filter_rssi;
1961 :
1962 0 : interval = wpa_s->conf->sched_scan_interval ?
1963 0 : wpa_s->conf->sched_scan_interval : 10;
1964 :
1965 0 : if (params.freqs == NULL && wpa_s->manual_sched_scan_freqs) {
1966 0 : wpa_dbg(wpa_s, MSG_DEBUG, "Limit sched scan to specified channels");
1967 0 : params.freqs = wpa_s->manual_sched_scan_freqs;
1968 : }
1969 :
1970 0 : ret = wpa_supplicant_start_sched_scan(wpa_s, ¶ms, interval);
1971 0 : os_free(params.filter_ssids);
1972 0 : if (ret == 0)
1973 0 : wpa_s->pno = 1;
1974 : else
1975 0 : wpa_msg(wpa_s, MSG_ERROR, "Failed to schedule PNO");
1976 0 : return ret;
1977 : }
1978 :
1979 :
1980 1 : int wpas_stop_pno(struct wpa_supplicant *wpa_s)
1981 : {
1982 1 : int ret = 0;
1983 :
1984 1 : if (!wpa_s->pno)
1985 1 : return 0;
1986 :
1987 0 : ret = wpa_supplicant_stop_sched_scan(wpa_s);
1988 :
1989 0 : wpa_s->pno = 0;
1990 0 : wpa_s->pno_sched_pending = 0;
1991 :
1992 0 : if (wpa_s->wpa_state == WPA_SCANNING)
1993 0 : wpa_supplicant_req_scan(wpa_s, 0, 0);
1994 :
1995 0 : return ret;
1996 : }
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