1 /*
2 * WPA Supplicant - Scanning
3 * Copyright (c) 2003-2014, Jouni Malinen <j@w1.fi>
4 *
5 * This software may be distributed under the terms of the BSD license.
6 * See README for more details.
7 */
8
9 #include "utils/includes.h"
10
11 #include "utils/common.h"
12 #include "utils/eloop.h"
13 #include "common/ieee802_11_defs.h"
14 #include "common/wpa_ctrl.h"
15 #include "config.h"
16 #include "wpa_supplicant_i.h"
17 #include "driver_i.h"
18 #include "wps_supplicant.h"
19 #include "p2p_supplicant.h"
20 #include "p2p/p2p.h"
21 #include "hs20_supplicant.h"
22 #include "notify.h"
23 #include "bss.h"
24 #include "scan.h"
25 #include "mesh.h"
26
27
wpa_supplicant_gen_assoc_event(struct wpa_supplicant * wpa_s)28 static void wpa_supplicant_gen_assoc_event(struct wpa_supplicant *wpa_s)
29 {
30 struct wpa_ssid *ssid;
31 union wpa_event_data data;
32
33 ssid = wpa_supplicant_get_ssid(wpa_s);
34 if (ssid == NULL)
35 return;
36
37 if (wpa_s->current_ssid == NULL) {
38 wpa_s->current_ssid = ssid;
39 if (wpa_s->current_ssid != NULL)
40 wpas_notify_network_changed(wpa_s);
41 }
42 wpa_supplicant_initiate_eapol(wpa_s);
43 wpa_dbg(wpa_s, MSG_DEBUG, "Already associated with a configured "
44 "network - generating associated event");
45 os_memset(&data, 0, sizeof(data));
46 wpa_supplicant_event(wpa_s, EVENT_ASSOC, &data);
47 }
48
49
50 #ifdef CONFIG_WPS
wpas_wps_in_use(struct wpa_supplicant * wpa_s,enum wps_request_type * req_type)51 static int wpas_wps_in_use(struct wpa_supplicant *wpa_s,
52 enum wps_request_type *req_type)
53 {
54 struct wpa_ssid *ssid;
55 int wps = 0;
56
57 for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
58 if (!(ssid->key_mgmt & WPA_KEY_MGMT_WPS))
59 continue;
60
61 wps = 1;
62 *req_type = wpas_wps_get_req_type(ssid);
63 if (!ssid->eap.phase1)
64 continue;
65
66 if (os_strstr(ssid->eap.phase1, "pbc=1"))
67 return 2;
68 }
69
70 #ifdef CONFIG_P2P
71 if (!wpa_s->global->p2p_disabled && wpa_s->global->p2p &&
72 !wpa_s->conf->p2p_disabled) {
73 wpa_s->wps->dev.p2p = 1;
74 if (!wps) {
75 wps = 1;
76 *req_type = WPS_REQ_ENROLLEE_INFO;
77 }
78 }
79 #endif /* CONFIG_P2P */
80
81 return wps;
82 }
83 #endif /* CONFIG_WPS */
84
85
86 /**
87 * wpa_supplicant_enabled_networks - Check whether there are enabled networks
88 * @wpa_s: Pointer to wpa_supplicant data
89 * Returns: 0 if no networks are enabled, >0 if networks are enabled
90 *
91 * This function is used to figure out whether any networks (or Interworking
92 * with enabled credentials and auto_interworking) are present in the current
93 * configuration.
94 */
wpa_supplicant_enabled_networks(struct wpa_supplicant * wpa_s)95 int wpa_supplicant_enabled_networks(struct wpa_supplicant *wpa_s)
96 {
97 struct wpa_ssid *ssid = wpa_s->conf->ssid;
98 int count = 0, disabled = 0;
99
100 if (wpa_s->p2p_mgmt)
101 return 0; /* no normal network profiles on p2p_mgmt interface */
102
103 while (ssid) {
104 if (!wpas_network_disabled(wpa_s, ssid))
105 count++;
106 else
107 disabled++;
108 ssid = ssid->next;
109 }
110 if (wpa_s->conf->cred && wpa_s->conf->interworking &&
111 wpa_s->conf->auto_interworking)
112 count++;
113 if (count == 0 && disabled > 0) {
114 wpa_dbg(wpa_s, MSG_DEBUG, "No enabled networks (%d disabled "
115 "networks)", disabled);
116 }
117 return count;
118 }
119
120
wpa_supplicant_assoc_try(struct wpa_supplicant * wpa_s,struct wpa_ssid * ssid)121 static void wpa_supplicant_assoc_try(struct wpa_supplicant *wpa_s,
122 struct wpa_ssid *ssid)
123 {
124 while (ssid) {
125 if (!wpas_network_disabled(wpa_s, ssid))
126 break;
127 ssid = ssid->next;
128 }
129
130 /* ap_scan=2 mode - try to associate with each SSID. */
131 if (ssid == NULL) {
132 wpa_dbg(wpa_s, MSG_DEBUG, "wpa_supplicant_assoc_try: Reached "
133 "end of scan list - go back to beginning");
134 wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
135 wpa_supplicant_req_scan(wpa_s, 0, 0);
136 return;
137 }
138 if (ssid->next) {
139 /* Continue from the next SSID on the next attempt. */
140 wpa_s->prev_scan_ssid = ssid;
141 } else {
142 /* Start from the beginning of the SSID list. */
143 wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
144 }
145 wpa_supplicant_associate(wpa_s, NULL, ssid);
146 }
147
148
wpas_trigger_scan_cb(struct wpa_radio_work * work,int deinit)149 static void wpas_trigger_scan_cb(struct wpa_radio_work *work, int deinit)
150 {
151 struct wpa_supplicant *wpa_s = work->wpa_s;
152 struct wpa_driver_scan_params *params = work->ctx;
153 int ret;
154
155 if (deinit) {
156 if (!work->started) {
157 wpa_scan_free_params(params);
158 return;
159 }
160 wpa_supplicant_notify_scanning(wpa_s, 0);
161 wpas_notify_scan_done(wpa_s, 0);
162 wpa_s->scan_work = NULL;
163 return;
164 }
165
166 if (wpas_update_random_addr_disassoc(wpa_s) < 0) {
167 wpa_msg(wpa_s, MSG_INFO,
168 "Failed to assign random MAC address for a scan");
169 radio_work_done(work);
170 return;
171 }
172
173 wpa_supplicant_notify_scanning(wpa_s, 1);
174
175 if (wpa_s->clear_driver_scan_cache) {
176 wpa_printf(MSG_DEBUG,
177 "Request driver to clear scan cache due to local BSS flush");
178 params->only_new_results = 1;
179 }
180 ret = wpa_drv_scan(wpa_s, params);
181 wpa_scan_free_params(params);
182 work->ctx = NULL;
183 if (ret) {
184 int retry = wpa_s->last_scan_req != MANUAL_SCAN_REQ;
185
186 if (wpa_s->disconnected)
187 retry = 0;
188
189 wpa_supplicant_notify_scanning(wpa_s, 0);
190 wpas_notify_scan_done(wpa_s, 0);
191 if (wpa_s->wpa_state == WPA_SCANNING)
192 wpa_supplicant_set_state(wpa_s,
193 wpa_s->scan_prev_wpa_state);
194 wpa_msg(wpa_s, MSG_INFO, WPA_EVENT_SCAN_FAILED "ret=%d%s",
195 ret, retry ? " retry=1" : "");
196 radio_work_done(work);
197
198 if (retry) {
199 /* Restore scan_req since we will try to scan again */
200 wpa_s->scan_req = wpa_s->last_scan_req;
201 wpa_supplicant_req_scan(wpa_s, 1, 0);
202 }
203 return;
204 }
205
206 os_get_reltime(&wpa_s->scan_trigger_time);
207 wpa_s->scan_runs++;
208 wpa_s->normal_scans++;
209 wpa_s->own_scan_requested = 1;
210 wpa_s->clear_driver_scan_cache = 0;
211 wpa_s->scan_work = work;
212 }
213
214
215 /**
216 * wpa_supplicant_trigger_scan - Request driver to start a scan
217 * @wpa_s: Pointer to wpa_supplicant data
218 * @params: Scan parameters
219 * Returns: 0 on success, -1 on failure
220 */
wpa_supplicant_trigger_scan(struct wpa_supplicant * wpa_s,struct wpa_driver_scan_params * params)221 int wpa_supplicant_trigger_scan(struct wpa_supplicant *wpa_s,
222 struct wpa_driver_scan_params *params)
223 {
224 struct wpa_driver_scan_params *ctx;
225
226 if (wpa_s->scan_work) {
227 wpa_dbg(wpa_s, MSG_INFO, "Reject scan trigger since one is already pending");
228 return -1;
229 }
230
231 ctx = wpa_scan_clone_params(params);
232 if (ctx == NULL)
233 return -1;
234
235 if (radio_add_work(wpa_s, 0, "scan", 0, wpas_trigger_scan_cb, ctx) < 0)
236 {
237 wpa_scan_free_params(ctx);
238 return -1;
239 }
240
241 return 0;
242 }
243
244
245 static void
wpa_supplicant_delayed_sched_scan_timeout(void * eloop_ctx,void * timeout_ctx)246 wpa_supplicant_delayed_sched_scan_timeout(void *eloop_ctx, void *timeout_ctx)
247 {
248 struct wpa_supplicant *wpa_s = eloop_ctx;
249
250 wpa_dbg(wpa_s, MSG_DEBUG, "Starting delayed sched scan");
251
252 if (wpa_supplicant_req_sched_scan(wpa_s))
253 wpa_supplicant_req_scan(wpa_s, 0, 0);
254 }
255
256
257 static void
wpa_supplicant_sched_scan_timeout(void * eloop_ctx,void * timeout_ctx)258 wpa_supplicant_sched_scan_timeout(void *eloop_ctx, void *timeout_ctx)
259 {
260 struct wpa_supplicant *wpa_s = eloop_ctx;
261
262 wpa_dbg(wpa_s, MSG_DEBUG, "Sched scan timeout - stopping it");
263
264 wpa_s->sched_scan_timed_out = 1;
265 wpa_supplicant_cancel_sched_scan(wpa_s);
266 }
267
268
wpa_supplicant_start_sched_scan(struct wpa_supplicant * wpa_s,struct wpa_driver_scan_params * params)269 int wpa_supplicant_start_sched_scan(struct wpa_supplicant *wpa_s,
270 struct wpa_driver_scan_params *params)
271 {
272 int ret;
273
274 wpa_supplicant_notify_scanning(wpa_s, 1);
275 ret = wpa_drv_sched_scan(wpa_s, params);
276 if (ret)
277 wpa_supplicant_notify_scanning(wpa_s, 0);
278 else
279 wpa_s->sched_scanning = 1;
280
281 return ret;
282 }
283
284
wpa_supplicant_stop_sched_scan(struct wpa_supplicant * wpa_s)285 int wpa_supplicant_stop_sched_scan(struct wpa_supplicant *wpa_s)
286 {
287 int ret;
288
289 ret = wpa_drv_stop_sched_scan(wpa_s);
290 if (ret) {
291 wpa_dbg(wpa_s, MSG_DEBUG, "stopping sched_scan failed!");
292 /* TODO: what to do if stopping fails? */
293 return -1;
294 }
295
296 return ret;
297 }
298
299
300 static struct wpa_driver_scan_filter *
wpa_supplicant_build_filter_ssids(struct wpa_config * conf,size_t * num_ssids)301 wpa_supplicant_build_filter_ssids(struct wpa_config *conf, size_t *num_ssids)
302 {
303 struct wpa_driver_scan_filter *ssids;
304 struct wpa_ssid *ssid;
305 size_t count;
306
307 *num_ssids = 0;
308 if (!conf->filter_ssids)
309 return NULL;
310
311 for (count = 0, ssid = conf->ssid; ssid; ssid = ssid->next) {
312 if (ssid->ssid && ssid->ssid_len)
313 count++;
314 }
315 if (count == 0)
316 return NULL;
317 ssids = os_calloc(count, sizeof(struct wpa_driver_scan_filter));
318 if (ssids == NULL)
319 return NULL;
320
321 for (ssid = conf->ssid; ssid; ssid = ssid->next) {
322 if (!ssid->ssid || !ssid->ssid_len)
323 continue;
324 os_memcpy(ssids[*num_ssids].ssid, ssid->ssid, ssid->ssid_len);
325 ssids[*num_ssids].ssid_len = ssid->ssid_len;
326 (*num_ssids)++;
327 }
328
329 return ssids;
330 }
331
332
wpa_supplicant_optimize_freqs(struct wpa_supplicant * wpa_s,struct wpa_driver_scan_params * params)333 static void wpa_supplicant_optimize_freqs(
334 struct wpa_supplicant *wpa_s, struct wpa_driver_scan_params *params)
335 {
336 #ifdef CONFIG_P2P
337 if (params->freqs == NULL && wpa_s->p2p_in_provisioning &&
338 wpa_s->go_params) {
339 /* Optimize provisioning state scan based on GO information */
340 if (wpa_s->p2p_in_provisioning < 5 &&
341 wpa_s->go_params->freq > 0) {
342 wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only GO "
343 "preferred frequency %d MHz",
344 wpa_s->go_params->freq);
345 params->freqs = os_calloc(2, sizeof(int));
346 if (params->freqs)
347 params->freqs[0] = wpa_s->go_params->freq;
348 } else if (wpa_s->p2p_in_provisioning < 8 &&
349 wpa_s->go_params->freq_list[0]) {
350 wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only common "
351 "channels");
352 int_array_concat(¶ms->freqs,
353 wpa_s->go_params->freq_list);
354 if (params->freqs)
355 int_array_sort_unique(params->freqs);
356 }
357 wpa_s->p2p_in_provisioning++;
358 }
359
360 if (params->freqs == NULL && wpa_s->p2p_in_invitation) {
361 /*
362 * Optimize scan based on GO information during persistent
363 * group reinvocation
364 */
365 if (wpa_s->p2p_in_invitation < 5 &&
366 wpa_s->p2p_invite_go_freq > 0) {
367 wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only GO preferred frequency %d MHz during invitation",
368 wpa_s->p2p_invite_go_freq);
369 params->freqs = os_calloc(2, sizeof(int));
370 if (params->freqs)
371 params->freqs[0] = wpa_s->p2p_invite_go_freq;
372 }
373 wpa_s->p2p_in_invitation++;
374 if (wpa_s->p2p_in_invitation > 20) {
375 /*
376 * This should not really happen since the variable is
377 * cleared on group removal, but if it does happen, make
378 * sure we do not get stuck in special invitation scan
379 * mode.
380 */
381 wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Clear p2p_in_invitation");
382 wpa_s->p2p_in_invitation = 0;
383 }
384 }
385 #endif /* CONFIG_P2P */
386
387 #ifdef CONFIG_WPS
388 if (params->freqs == NULL && wpa_s->after_wps && wpa_s->wps_freq) {
389 /*
390 * Optimize post-provisioning scan based on channel used
391 * during provisioning.
392 */
393 wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Scan only frequency %u MHz "
394 "that was used during provisioning", wpa_s->wps_freq);
395 params->freqs = os_calloc(2, sizeof(int));
396 if (params->freqs)
397 params->freqs[0] = wpa_s->wps_freq;
398 wpa_s->after_wps--;
399 } else if (wpa_s->after_wps)
400 wpa_s->after_wps--;
401
402 if (params->freqs == NULL && wpa_s->known_wps_freq && wpa_s->wps_freq)
403 {
404 /* Optimize provisioning scan based on already known channel */
405 wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Scan only frequency %u MHz",
406 wpa_s->wps_freq);
407 params->freqs = os_calloc(2, sizeof(int));
408 if (params->freqs)
409 params->freqs[0] = wpa_s->wps_freq;
410 wpa_s->known_wps_freq = 0; /* only do this once */
411 }
412 #endif /* CONFIG_WPS */
413 }
414
415
416 #ifdef CONFIG_INTERWORKING
wpas_add_interworking_elements(struct wpa_supplicant * wpa_s,struct wpabuf * buf)417 static void wpas_add_interworking_elements(struct wpa_supplicant *wpa_s,
418 struct wpabuf *buf)
419 {
420 wpabuf_put_u8(buf, WLAN_EID_INTERWORKING);
421 wpabuf_put_u8(buf, is_zero_ether_addr(wpa_s->conf->hessid) ? 1 :
422 1 + ETH_ALEN);
423 wpabuf_put_u8(buf, wpa_s->conf->access_network_type);
424 /* No Venue Info */
425 if (!is_zero_ether_addr(wpa_s->conf->hessid))
426 wpabuf_put_data(buf, wpa_s->conf->hessid, ETH_ALEN);
427 }
428 #endif /* CONFIG_INTERWORKING */
429
430
wpa_supplicant_extra_ies(struct wpa_supplicant * wpa_s)431 static struct wpabuf * wpa_supplicant_extra_ies(struct wpa_supplicant *wpa_s)
432 {
433 struct wpabuf *extra_ie = NULL;
434 u8 ext_capab[18];
435 int ext_capab_len;
436 #ifdef CONFIG_WPS
437 int wps = 0;
438 enum wps_request_type req_type = WPS_REQ_ENROLLEE_INFO;
439 #endif /* CONFIG_WPS */
440
441 ext_capab_len = wpas_build_ext_capab(wpa_s, ext_capab,
442 sizeof(ext_capab));
443 if (ext_capab_len > 0 &&
444 wpabuf_resize(&extra_ie, ext_capab_len) == 0)
445 wpabuf_put_data(extra_ie, ext_capab, ext_capab_len);
446
447 #ifdef CONFIG_INTERWORKING
448 if (wpa_s->conf->interworking &&
449 wpabuf_resize(&extra_ie, 100) == 0)
450 wpas_add_interworking_elements(wpa_s, extra_ie);
451 #endif /* CONFIG_INTERWORKING */
452
453 #ifdef CONFIG_WPS
454 wps = wpas_wps_in_use(wpa_s, &req_type);
455
456 if (wps) {
457 struct wpabuf *wps_ie;
458 wps_ie = wps_build_probe_req_ie(wps == 2 ? DEV_PW_PUSHBUTTON :
459 DEV_PW_DEFAULT,
460 &wpa_s->wps->dev,
461 wpa_s->wps->uuid, req_type,
462 0, NULL);
463 if (wps_ie) {
464 if (wpabuf_resize(&extra_ie, wpabuf_len(wps_ie)) == 0)
465 wpabuf_put_buf(extra_ie, wps_ie);
466 wpabuf_free(wps_ie);
467 }
468 }
469
470 #ifdef CONFIG_P2P
471 if (wps) {
472 size_t ielen = p2p_scan_ie_buf_len(wpa_s->global->p2p);
473 if (wpabuf_resize(&extra_ie, ielen) == 0)
474 wpas_p2p_scan_ie(wpa_s, extra_ie);
475 }
476 #endif /* CONFIG_P2P */
477
478 wpa_supplicant_mesh_add_scan_ie(wpa_s, &extra_ie);
479
480 #endif /* CONFIG_WPS */
481
482 #ifdef CONFIG_HS20
483 if (wpa_s->conf->hs20 && wpabuf_resize(&extra_ie, 7) == 0)
484 wpas_hs20_add_indication(extra_ie, -1);
485 #endif /* CONFIG_HS20 */
486
487 #ifdef CONFIG_FST
488 if (wpa_s->fst_ies &&
489 wpabuf_resize(&extra_ie, wpabuf_len(wpa_s->fst_ies)) == 0)
490 wpabuf_put_buf(extra_ie, wpa_s->fst_ies);
491 #endif /* CONFIG_FST */
492
493 #ifdef CONFIG_MBO
494 /* Send cellular capabilities for potential MBO STAs */
495 if (wpabuf_resize(&extra_ie, 9) == 0)
496 wpas_mbo_scan_ie(wpa_s, extra_ie);
497 #endif /* CONFIG_MBO */
498
499 return extra_ie;
500 }
501
502
503 #ifdef CONFIG_P2P
504
505 /*
506 * Check whether there are any enabled networks or credentials that could be
507 * used for a non-P2P connection.
508 */
non_p2p_network_enabled(struct wpa_supplicant * wpa_s)509 static int non_p2p_network_enabled(struct wpa_supplicant *wpa_s)
510 {
511 struct wpa_ssid *ssid;
512
513 for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
514 if (wpas_network_disabled(wpa_s, ssid))
515 continue;
516 if (!ssid->p2p_group)
517 return 1;
518 }
519
520 if (wpa_s->conf->cred && wpa_s->conf->interworking &&
521 wpa_s->conf->auto_interworking)
522 return 1;
523
524 return 0;
525 }
526
527 #endif /* CONFIG_P2P */
528
529
wpa_setband_scan_freqs_list(struct wpa_supplicant * wpa_s,enum hostapd_hw_mode band,struct wpa_driver_scan_params * params)530 static void wpa_setband_scan_freqs_list(struct wpa_supplicant *wpa_s,
531 enum hostapd_hw_mode band,
532 struct wpa_driver_scan_params *params)
533 {
534 /* Include only supported channels for the specified band */
535 struct hostapd_hw_modes *mode;
536 int count, i;
537
538 mode = get_mode(wpa_s->hw.modes, wpa_s->hw.num_modes, band);
539 if (mode == NULL) {
540 /* No channels supported in this band - use empty list */
541 params->freqs = os_zalloc(sizeof(int));
542 return;
543 }
544
545 params->freqs = os_calloc(mode->num_channels + 1, sizeof(int));
546 if (params->freqs == NULL)
547 return;
548 for (count = 0, i = 0; i < mode->num_channels; i++) {
549 if (mode->channels[i].flag & HOSTAPD_CHAN_DISABLED)
550 continue;
551 params->freqs[count++] = mode->channels[i].freq;
552 }
553 }
554
555
wpa_setband_scan_freqs(struct wpa_supplicant * wpa_s,struct wpa_driver_scan_params * params)556 static void wpa_setband_scan_freqs(struct wpa_supplicant *wpa_s,
557 struct wpa_driver_scan_params *params)
558 {
559 if (wpa_s->hw.modes == NULL)
560 return; /* unknown what channels the driver supports */
561 if (params->freqs)
562 return; /* already using a limited channel set */
563 if (wpa_s->setband == WPA_SETBAND_5G)
564 wpa_setband_scan_freqs_list(wpa_s, HOSTAPD_MODE_IEEE80211A,
565 params);
566 else if (wpa_s->setband == WPA_SETBAND_2G)
567 wpa_setband_scan_freqs_list(wpa_s, HOSTAPD_MODE_IEEE80211G,
568 params);
569 }
570
571
wpa_set_scan_ssids(struct wpa_supplicant * wpa_s,struct wpa_driver_scan_params * params,size_t max_ssids)572 static void wpa_set_scan_ssids(struct wpa_supplicant *wpa_s,
573 struct wpa_driver_scan_params *params,
574 size_t max_ssids)
575 {
576 unsigned int i;
577 struct wpa_ssid *ssid;
578 /*
579 * For devices with |max_ssids| greater than 1, leave the last slot empty
580 * for adding the wildcard scan entry.
581 */
582 max_ssids = (max_ssids == 1) ? max_ssids : max_ssids - 1;
583
584 for (i = 0; i < wpa_s->scan_id_count; i++) {
585 unsigned int j;
586
587 ssid = wpa_config_get_network(wpa_s->conf, wpa_s->scan_id[i]);
588 if (!ssid || !ssid->scan_ssid)
589 continue;
590
591 for (j = 0; j < params->num_ssids; j++) {
592 if (params->ssids[j].ssid_len == ssid->ssid_len &&
593 params->ssids[j].ssid &&
594 os_memcmp(params->ssids[j].ssid, ssid->ssid,
595 ssid->ssid_len) == 0)
596 break;
597 }
598 if (j < params->num_ssids)
599 continue; /* already in the list */
600
601 if (params->num_ssids + 1 > max_ssids) {
602 wpa_printf(MSG_DEBUG,
603 "Over max scan SSIDs for manual request");
604 break;
605 }
606
607 wpa_printf(MSG_DEBUG, "Scan SSID (manual request): %s",
608 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
609 params->ssids[params->num_ssids].ssid = ssid->ssid;
610 params->ssids[params->num_ssids].ssid_len = ssid->ssid_len;
611 params->num_ssids++;
612 }
613
614 wpa_s->scan_id_count = 0;
615 }
616
617
wpa_set_ssids_from_scan_req(struct wpa_supplicant * wpa_s,struct wpa_driver_scan_params * params,size_t max_ssids)618 static int wpa_set_ssids_from_scan_req(struct wpa_supplicant *wpa_s,
619 struct wpa_driver_scan_params *params,
620 size_t max_ssids)
621 {
622 unsigned int i;
623
624 if (wpa_s->ssids_from_scan_req == NULL ||
625 wpa_s->num_ssids_from_scan_req == 0)
626 return 0;
627
628 if (wpa_s->num_ssids_from_scan_req > max_ssids) {
629 wpa_s->num_ssids_from_scan_req = max_ssids;
630 wpa_printf(MSG_DEBUG, "Over max scan SSIDs from scan req: %u",
631 (unsigned int) max_ssids);
632 }
633
634 for (i = 0; i < wpa_s->num_ssids_from_scan_req; i++) {
635 params->ssids[i].ssid = wpa_s->ssids_from_scan_req[i].ssid;
636 params->ssids[i].ssid_len =
637 wpa_s->ssids_from_scan_req[i].ssid_len;
638 wpa_hexdump_ascii(MSG_DEBUG, "specific SSID",
639 params->ssids[i].ssid,
640 params->ssids[i].ssid_len);
641 }
642
643 params->num_ssids = wpa_s->num_ssids_from_scan_req;
644 wpa_s->num_ssids_from_scan_req = 0;
645 return 1;
646 }
647
648
wpa_supplicant_scan(void * eloop_ctx,void * timeout_ctx)649 static void wpa_supplicant_scan(void *eloop_ctx, void *timeout_ctx)
650 {
651 struct wpa_supplicant *wpa_s = eloop_ctx;
652 struct wpa_ssid *ssid;
653 int ret, p2p_in_prog;
654 struct wpabuf *extra_ie = NULL;
655 struct wpa_driver_scan_params params;
656 struct wpa_driver_scan_params *scan_params;
657 size_t max_ssids;
658 int connect_without_scan = 0;
659
660 if (wpa_s->pno || wpa_s->pno_sched_pending) {
661 wpa_dbg(wpa_s, MSG_DEBUG, "Skip scan - PNO is in progress");
662 return;
663 }
664
665 if (wpa_s->wpa_state == WPA_INTERFACE_DISABLED) {
666 wpa_dbg(wpa_s, MSG_DEBUG, "Skip scan - interface disabled");
667 return;
668 }
669
670 if (wpa_s->disconnected && wpa_s->scan_req == NORMAL_SCAN_REQ) {
671 wpa_dbg(wpa_s, MSG_DEBUG, "Disconnected - do not scan");
672 wpa_supplicant_set_state(wpa_s, WPA_DISCONNECTED);
673 return;
674 }
675
676 if (wpa_s->scanning) {
677 /*
678 * If we are already in scanning state, we shall reschedule the
679 * the incoming scan request.
680 */
681 wpa_dbg(wpa_s, MSG_DEBUG, "Already scanning - Reschedule the incoming scan req");
682 wpa_supplicant_req_scan(wpa_s, 1, 0);
683 return;
684 }
685
686 if (!wpa_supplicant_enabled_networks(wpa_s) &&
687 wpa_s->scan_req == NORMAL_SCAN_REQ) {
688 wpa_dbg(wpa_s, MSG_DEBUG, "No enabled networks - do not scan");
689 wpa_supplicant_set_state(wpa_s, WPA_INACTIVE);
690 return;
691 }
692
693 if (wpa_s->conf->ap_scan != 0 &&
694 (wpa_s->drv_flags & WPA_DRIVER_FLAGS_WIRED)) {
695 wpa_dbg(wpa_s, MSG_DEBUG, "Using wired authentication - "
696 "overriding ap_scan configuration");
697 wpa_s->conf->ap_scan = 0;
698 wpas_notify_ap_scan_changed(wpa_s);
699 }
700
701 if (wpa_s->conf->ap_scan == 0) {
702 wpa_supplicant_gen_assoc_event(wpa_s);
703 return;
704 }
705
706 ssid = NULL;
707 if (wpa_s->scan_req != MANUAL_SCAN_REQ &&
708 wpa_s->connect_without_scan) {
709 connect_without_scan = 1;
710 for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
711 if (ssid == wpa_s->connect_without_scan)
712 break;
713 }
714 }
715
716 p2p_in_prog = wpas_p2p_in_progress(wpa_s);
717 if (p2p_in_prog && p2p_in_prog != 2 &&
718 (!ssid ||
719 (ssid->mode != WPAS_MODE_AP && ssid->mode != WPAS_MODE_P2P_GO))) {
720 wpa_dbg(wpa_s, MSG_DEBUG, "Delay station mode scan while P2P operation is in progress");
721 wpa_supplicant_req_scan(wpa_s, 5, 0);
722 return;
723 }
724
725 if (wpa_s->conf->ap_scan == 2)
726 max_ssids = 1;
727 else {
728 max_ssids = wpa_s->max_scan_ssids;
729 if (max_ssids > WPAS_MAX_SCAN_SSIDS)
730 max_ssids = WPAS_MAX_SCAN_SSIDS;
731 }
732
733 wpa_s->last_scan_req = wpa_s->scan_req;
734 wpa_s->scan_req = NORMAL_SCAN_REQ;
735
736 if (connect_without_scan) {
737 wpa_s->connect_without_scan = NULL;
738 if (ssid) {
739 wpa_printf(MSG_DEBUG, "Start a pre-selected network "
740 "without scan step");
741 wpa_supplicant_associate(wpa_s, NULL, ssid);
742 return;
743 }
744 }
745
746 os_memset(¶ms, 0, sizeof(params));
747
748 wpa_s->scan_prev_wpa_state = wpa_s->wpa_state;
749 if (wpa_s->wpa_state == WPA_DISCONNECTED ||
750 wpa_s->wpa_state == WPA_INACTIVE)
751 wpa_supplicant_set_state(wpa_s, WPA_SCANNING);
752
753 /*
754 * If autoscan has set its own scanning parameters
755 */
756 if (wpa_s->autoscan_params != NULL) {
757 scan_params = wpa_s->autoscan_params;
758 goto scan;
759 }
760
761 if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
762 wpa_set_ssids_from_scan_req(wpa_s, ¶ms, max_ssids)) {
763 wpa_printf(MSG_DEBUG, "Use specific SSIDs from SCAN command");
764 goto ssid_list_set;
765 }
766
767 #ifdef CONFIG_P2P
768 if ((wpa_s->p2p_in_provisioning || wpa_s->show_group_started) &&
769 wpa_s->go_params && !wpa_s->conf->passive_scan) {
770 wpa_printf(MSG_DEBUG, "P2P: Use specific SSID for scan during P2P group formation (p2p_in_provisioning=%d show_group_started=%d)",
771 wpa_s->p2p_in_provisioning,
772 wpa_s->show_group_started);
773 params.ssids[0].ssid = wpa_s->go_params->ssid;
774 params.ssids[0].ssid_len = wpa_s->go_params->ssid_len;
775 params.num_ssids = 1;
776 goto ssid_list_set;
777 }
778
779 if (wpa_s->p2p_in_invitation) {
780 if (wpa_s->current_ssid) {
781 wpa_printf(MSG_DEBUG, "P2P: Use specific SSID for scan during invitation");
782 params.ssids[0].ssid = wpa_s->current_ssid->ssid;
783 params.ssids[0].ssid_len =
784 wpa_s->current_ssid->ssid_len;
785 params.num_ssids = 1;
786 } else {
787 wpa_printf(MSG_DEBUG, "P2P: No specific SSID known for scan during invitation");
788 }
789 goto ssid_list_set;
790 }
791 #endif /* CONFIG_P2P */
792
793 /* Find the starting point from which to continue scanning */
794 ssid = wpa_s->conf->ssid;
795 if (wpa_s->prev_scan_ssid != WILDCARD_SSID_SCAN) {
796 while (ssid) {
797 if (ssid == wpa_s->prev_scan_ssid) {
798 ssid = ssid->next;
799 break;
800 }
801 ssid = ssid->next;
802 }
803 }
804
805 if (wpa_s->last_scan_req != MANUAL_SCAN_REQ &&
806 #ifdef CONFIG_AP
807 !wpa_s->ap_iface &&
808 #endif /* CONFIG_AP */
809 wpa_s->conf->ap_scan == 2) {
810 wpa_s->connect_without_scan = NULL;
811 wpa_s->prev_scan_wildcard = 0;
812 wpa_supplicant_assoc_try(wpa_s, ssid);
813 return;
814 } else if (wpa_s->conf->ap_scan == 2) {
815 /*
816 * User-initiated scan request in ap_scan == 2; scan with
817 * wildcard SSID.
818 */
819 ssid = NULL;
820 } else if (wpa_s->reattach && wpa_s->current_ssid != NULL) {
821 /*
822 * Perform single-channel single-SSID scan for
823 * reassociate-to-same-BSS operation.
824 */
825 /* Setup SSID */
826 ssid = wpa_s->current_ssid;
827 wpa_hexdump_ascii(MSG_DEBUG, "Scan SSID",
828 ssid->ssid, ssid->ssid_len);
829 params.ssids[0].ssid = ssid->ssid;
830 params.ssids[0].ssid_len = ssid->ssid_len;
831 params.num_ssids = 1;
832
833 /*
834 * Allocate memory for frequency array, allocate one extra
835 * slot for the zero-terminator.
836 */
837 params.freqs = os_malloc(sizeof(int) * 2);
838 if (params.freqs == NULL) {
839 wpa_dbg(wpa_s, MSG_ERROR, "Memory allocation failed");
840 return;
841 }
842 params.freqs[0] = wpa_s->assoc_freq;
843 params.freqs[1] = 0;
844
845 /*
846 * Reset the reattach flag so that we fall back to full scan if
847 * this scan fails.
848 */
849 wpa_s->reattach = 0;
850 } else {
851 struct wpa_ssid *start = ssid, *tssid;
852 int freqs_set = 0;
853 if (ssid == NULL && max_ssids > 1)
854 ssid = wpa_s->conf->ssid;
855 while (ssid) {
856 if (!wpas_network_disabled(wpa_s, ssid) &&
857 ssid->scan_ssid) {
858 wpa_hexdump_ascii(MSG_DEBUG, "Scan SSID",
859 ssid->ssid, ssid->ssid_len);
860 params.ssids[params.num_ssids].ssid =
861 ssid->ssid;
862 params.ssids[params.num_ssids].ssid_len =
863 ssid->ssid_len;
864 params.num_ssids++;
865 if (params.num_ssids + 1 >= max_ssids)
866 break;
867 }
868 ssid = ssid->next;
869 if (ssid == start)
870 break;
871 if (ssid == NULL && max_ssids > 1 &&
872 start != wpa_s->conf->ssid)
873 ssid = wpa_s->conf->ssid;
874 }
875
876 if (wpa_s->scan_id_count &&
877 wpa_s->last_scan_req == MANUAL_SCAN_REQ)
878 wpa_set_scan_ssids(wpa_s, ¶ms, max_ssids);
879
880 for (tssid = wpa_s->conf->ssid;
881 wpa_s->last_scan_req != MANUAL_SCAN_REQ && tssid;
882 tssid = tssid->next) {
883 if (wpas_network_disabled(wpa_s, tssid))
884 continue;
885 if ((params.freqs || !freqs_set) && tssid->scan_freq) {
886 int_array_concat(¶ms.freqs,
887 tssid->scan_freq);
888 } else {
889 os_free(params.freqs);
890 params.freqs = NULL;
891 }
892 freqs_set = 1;
893 }
894 int_array_sort_unique(params.freqs);
895 }
896
897 if (ssid && max_ssids == 1) {
898 /*
899 * If the driver is limited to 1 SSID at a time interleave
900 * wildcard SSID scans with specific SSID scans to avoid
901 * waiting a long time for a wildcard scan.
902 */
903 if (!wpa_s->prev_scan_wildcard) {
904 params.ssids[0].ssid = NULL;
905 params.ssids[0].ssid_len = 0;
906 wpa_s->prev_scan_wildcard = 1;
907 wpa_dbg(wpa_s, MSG_DEBUG, "Starting AP scan for "
908 "wildcard SSID (Interleave with specific)");
909 } else {
910 wpa_s->prev_scan_ssid = ssid;
911 wpa_s->prev_scan_wildcard = 0;
912 wpa_dbg(wpa_s, MSG_DEBUG,
913 "Starting AP scan for specific SSID: %s",
914 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
915 }
916 } else if (ssid) {
917 /* max_ssids > 1 */
918
919 wpa_s->prev_scan_ssid = ssid;
920 wpa_dbg(wpa_s, MSG_DEBUG, "Include wildcard SSID in "
921 "the scan request");
922 params.num_ssids++;
923 } else if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
924 wpa_s->manual_scan_passive && params.num_ssids == 0) {
925 wpa_dbg(wpa_s, MSG_DEBUG, "Use passive scan based on manual request");
926 } else if (wpa_s->conf->passive_scan) {
927 wpa_dbg(wpa_s, MSG_DEBUG,
928 "Use passive scan based on configuration");
929 } else {
930 wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
931 params.num_ssids++;
932 wpa_dbg(wpa_s, MSG_DEBUG, "Starting AP scan for wildcard "
933 "SSID");
934 }
935
936 ssid_list_set:
937 wpa_supplicant_optimize_freqs(wpa_s, ¶ms);
938 extra_ie = wpa_supplicant_extra_ies(wpa_s);
939
940 if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
941 wpa_s->manual_scan_only_new) {
942 wpa_printf(MSG_DEBUG,
943 "Request driver to clear scan cache due to manual only_new=1 scan");
944 params.only_new_results = 1;
945 }
946
947 if (wpa_s->last_scan_req == MANUAL_SCAN_REQ && params.freqs == NULL &&
948 wpa_s->manual_scan_freqs) {
949 wpa_dbg(wpa_s, MSG_DEBUG, "Limit manual scan to specified channels");
950 params.freqs = wpa_s->manual_scan_freqs;
951 wpa_s->manual_scan_freqs = NULL;
952 }
953
954 if (params.freqs == NULL && wpa_s->next_scan_freqs) {
955 wpa_dbg(wpa_s, MSG_DEBUG, "Optimize scan based on previously "
956 "generated frequency list");
957 params.freqs = wpa_s->next_scan_freqs;
958 } else
959 os_free(wpa_s->next_scan_freqs);
960 wpa_s->next_scan_freqs = NULL;
961 wpa_setband_scan_freqs(wpa_s, ¶ms);
962
963 /* See if user specified frequencies. If so, scan only those. */
964 if (wpa_s->conf->freq_list && !params.freqs) {
965 wpa_dbg(wpa_s, MSG_DEBUG,
966 "Optimize scan based on conf->freq_list");
967 int_array_concat(¶ms.freqs, wpa_s->conf->freq_list);
968 }
969
970 /* Use current associated channel? */
971 if (wpa_s->conf->scan_cur_freq && !params.freqs) {
972 unsigned int num = wpa_s->num_multichan_concurrent;
973
974 params.freqs = os_calloc(num + 1, sizeof(int));
975 if (params.freqs) {
976 num = get_shared_radio_freqs(wpa_s, params.freqs, num);
977 if (num > 0) {
978 wpa_dbg(wpa_s, MSG_DEBUG, "Scan only the "
979 "current operating channels since "
980 "scan_cur_freq is enabled");
981 } else {
982 os_free(params.freqs);
983 params.freqs = NULL;
984 }
985 }
986 }
987
988 params.filter_ssids = wpa_supplicant_build_filter_ssids(
989 wpa_s->conf, ¶ms.num_filter_ssids);
990 if (extra_ie) {
991 params.extra_ies = wpabuf_head(extra_ie);
992 params.extra_ies_len = wpabuf_len(extra_ie);
993 }
994
995 #ifdef CONFIG_P2P
996 if (wpa_s->p2p_in_provisioning || wpa_s->p2p_in_invitation ||
997 (wpa_s->show_group_started && wpa_s->go_params)) {
998 /*
999 * The interface may not yet be in P2P mode, so we have to
1000 * explicitly request P2P probe to disable CCK rates.
1001 */
1002 params.p2p_probe = 1;
1003 }
1004 #endif /* CONFIG_P2P */
1005
1006 if (wpa_s->mac_addr_rand_enable & MAC_ADDR_RAND_SCAN) {
1007 params.mac_addr_rand = 1;
1008 if (wpa_s->mac_addr_scan) {
1009 params.mac_addr = wpa_s->mac_addr_scan;
1010 params.mac_addr_mask = wpa_s->mac_addr_scan + ETH_ALEN;
1011 }
1012 }
1013
1014 if (!is_zero_ether_addr(wpa_s->next_scan_bssid)) {
1015 struct wpa_bss *bss;
1016
1017 params.bssid = wpa_s->next_scan_bssid;
1018 bss = wpa_bss_get_bssid_latest(wpa_s, params.bssid);
1019 if (bss && bss->ssid_len && params.num_ssids == 1 &&
1020 params.ssids[0].ssid_len == 0) {
1021 params.ssids[0].ssid = bss->ssid;
1022 params.ssids[0].ssid_len = bss->ssid_len;
1023 wpa_dbg(wpa_s, MSG_DEBUG,
1024 "Scan a previously specified BSSID " MACSTR
1025 " and SSID %s",
1026 MAC2STR(params.bssid),
1027 wpa_ssid_txt(bss->ssid, bss->ssid_len));
1028 } else {
1029 wpa_dbg(wpa_s, MSG_DEBUG,
1030 "Scan a previously specified BSSID " MACSTR,
1031 MAC2STR(params.bssid));
1032 }
1033 }
1034
1035 scan_params = ¶ms;
1036
1037 scan:
1038 #ifdef CONFIG_P2P
1039 /*
1040 * If the driver does not support multi-channel concurrency and a
1041 * virtual interface that shares the same radio with the wpa_s interface
1042 * is operating there may not be need to scan other channels apart from
1043 * the current operating channel on the other virtual interface. Filter
1044 * out other channels in case we are trying to find a connection for a
1045 * station interface when we are not configured to prefer station
1046 * connection and a concurrent operation is already in process.
1047 */
1048 if (wpa_s->scan_for_connection &&
1049 wpa_s->last_scan_req == NORMAL_SCAN_REQ &&
1050 !scan_params->freqs && !params.freqs &&
1051 wpas_is_p2p_prioritized(wpa_s) &&
1052 wpa_s->p2p_group_interface == NOT_P2P_GROUP_INTERFACE &&
1053 non_p2p_network_enabled(wpa_s)) {
1054 unsigned int num = wpa_s->num_multichan_concurrent;
1055
1056 params.freqs = os_calloc(num + 1, sizeof(int));
1057 if (params.freqs) {
1058 num = get_shared_radio_freqs(wpa_s, params.freqs, num);
1059 if (num > 0 && num == wpa_s->num_multichan_concurrent) {
1060 wpa_dbg(wpa_s, MSG_DEBUG, "Scan only the current operating channels since all channels are already used");
1061 } else {
1062 os_free(params.freqs);
1063 params.freqs = NULL;
1064 }
1065 }
1066 }
1067 #endif /* CONFIG_P2P */
1068
1069 ret = wpa_supplicant_trigger_scan(wpa_s, scan_params);
1070
1071 if (ret && wpa_s->last_scan_req == MANUAL_SCAN_REQ && params.freqs &&
1072 !wpa_s->manual_scan_freqs) {
1073 /* Restore manual_scan_freqs for the next attempt */
1074 wpa_s->manual_scan_freqs = params.freqs;
1075 params.freqs = NULL;
1076 }
1077
1078 wpabuf_free(extra_ie);
1079 os_free(params.freqs);
1080 os_free(params.filter_ssids);
1081
1082 if (ret) {
1083 wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate AP scan");
1084 if (wpa_s->scan_prev_wpa_state != wpa_s->wpa_state)
1085 wpa_supplicant_set_state(wpa_s,
1086 wpa_s->scan_prev_wpa_state);
1087 /* Restore scan_req since we will try to scan again */
1088 wpa_s->scan_req = wpa_s->last_scan_req;
1089 wpa_supplicant_req_scan(wpa_s, 1, 0);
1090 } else {
1091 wpa_s->scan_for_connection = 0;
1092 #ifdef CONFIG_INTERWORKING
1093 wpa_s->interworking_fast_assoc_tried = 0;
1094 #endif /* CONFIG_INTERWORKING */
1095 if (params.bssid)
1096 os_memset(wpa_s->next_scan_bssid, 0, ETH_ALEN);
1097 }
1098 }
1099
1100
wpa_supplicant_update_scan_int(struct wpa_supplicant * wpa_s,int sec)1101 void wpa_supplicant_update_scan_int(struct wpa_supplicant *wpa_s, int sec)
1102 {
1103 struct os_reltime remaining, new_int;
1104 int cancelled;
1105
1106 cancelled = eloop_cancel_timeout_one(wpa_supplicant_scan, wpa_s, NULL,
1107 &remaining);
1108
1109 new_int.sec = sec;
1110 new_int.usec = 0;
1111 if (cancelled && os_reltime_before(&remaining, &new_int)) {
1112 new_int.sec = remaining.sec;
1113 new_int.usec = remaining.usec;
1114 }
1115
1116 if (cancelled) {
1117 eloop_register_timeout(new_int.sec, new_int.usec,
1118 wpa_supplicant_scan, wpa_s, NULL);
1119 }
1120 wpa_s->scan_interval = sec;
1121 }
1122
1123
1124 /**
1125 * wpa_supplicant_req_scan - Schedule a scan for neighboring access points
1126 * @wpa_s: Pointer to wpa_supplicant data
1127 * @sec: Number of seconds after which to scan
1128 * @usec: Number of microseconds after which to scan
1129 *
1130 * This function is used to schedule a scan for neighboring access points after
1131 * the specified time.
1132 */
wpa_supplicant_req_scan(struct wpa_supplicant * wpa_s,int sec,int usec)1133 void wpa_supplicant_req_scan(struct wpa_supplicant *wpa_s, int sec, int usec)
1134 {
1135 int res;
1136
1137 if (wpa_s->p2p_mgmt) {
1138 wpa_dbg(wpa_s, MSG_DEBUG,
1139 "Ignore scan request (%d.%06d sec) on p2p_mgmt interface",
1140 sec, usec);
1141 return;
1142 }
1143
1144 res = eloop_deplete_timeout(sec, usec, wpa_supplicant_scan, wpa_s,
1145 NULL);
1146 if (res == 1) {
1147 wpa_dbg(wpa_s, MSG_DEBUG, "Rescheduling scan request: %d.%06d sec",
1148 sec, usec);
1149 } else if (res == 0) {
1150 wpa_dbg(wpa_s, MSG_DEBUG, "Ignore new scan request for %d.%06d sec since an earlier request is scheduled to trigger sooner",
1151 sec, usec);
1152 } else {
1153 wpa_dbg(wpa_s, MSG_DEBUG, "Setting scan request: %d.%06d sec",
1154 sec, usec);
1155 eloop_register_timeout(sec, usec, wpa_supplicant_scan, wpa_s, NULL);
1156 }
1157 }
1158
1159
1160 /**
1161 * wpa_supplicant_delayed_sched_scan - Request a delayed scheduled scan
1162 * @wpa_s: Pointer to wpa_supplicant data
1163 * @sec: Number of seconds after which to scan
1164 * @usec: Number of microseconds after which to scan
1165 * Returns: 0 on success or -1 otherwise
1166 *
1167 * This function is used to schedule periodic scans for neighboring
1168 * access points after the specified time.
1169 */
wpa_supplicant_delayed_sched_scan(struct wpa_supplicant * wpa_s,int sec,int usec)1170 int wpa_supplicant_delayed_sched_scan(struct wpa_supplicant *wpa_s,
1171 int sec, int usec)
1172 {
1173 if (!wpa_s->sched_scan_supported)
1174 return -1;
1175
1176 eloop_register_timeout(sec, usec,
1177 wpa_supplicant_delayed_sched_scan_timeout,
1178 wpa_s, NULL);
1179
1180 return 0;
1181 }
1182
1183
1184 /**
1185 * wpa_supplicant_req_sched_scan - Start a periodic scheduled scan
1186 * @wpa_s: Pointer to wpa_supplicant data
1187 * Returns: 0 is sched_scan was started or -1 otherwise
1188 *
1189 * This function is used to schedule periodic scans for neighboring
1190 * access points repeating the scan continuously.
1191 */
wpa_supplicant_req_sched_scan(struct wpa_supplicant * wpa_s)1192 int wpa_supplicant_req_sched_scan(struct wpa_supplicant *wpa_s)
1193 {
1194 struct wpa_driver_scan_params params;
1195 struct wpa_driver_scan_params *scan_params;
1196 enum wpa_states prev_state;
1197 struct wpa_ssid *ssid = NULL;
1198 struct wpabuf *extra_ie = NULL;
1199 int ret;
1200 unsigned int max_sched_scan_ssids;
1201 int wildcard = 0;
1202 int need_ssids;
1203 struct sched_scan_plan scan_plan;
1204
1205 if (!wpa_s->sched_scan_supported)
1206 return -1;
1207
1208 if (wpa_s->max_sched_scan_ssids > WPAS_MAX_SCAN_SSIDS)
1209 max_sched_scan_ssids = WPAS_MAX_SCAN_SSIDS;
1210 else
1211 max_sched_scan_ssids = wpa_s->max_sched_scan_ssids;
1212 if (max_sched_scan_ssids < 1 || wpa_s->conf->disable_scan_offload)
1213 return -1;
1214
1215 if (wpa_s->sched_scanning) {
1216 wpa_dbg(wpa_s, MSG_DEBUG, "Already sched scanning");
1217 return 0;
1218 }
1219
1220 need_ssids = 0;
1221 for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
1222 if (!wpas_network_disabled(wpa_s, ssid) && !ssid->scan_ssid) {
1223 /* Use wildcard SSID to find this network */
1224 wildcard = 1;
1225 } else if (!wpas_network_disabled(wpa_s, ssid) &&
1226 ssid->ssid_len)
1227 need_ssids++;
1228
1229 #ifdef CONFIG_WPS
1230 if (!wpas_network_disabled(wpa_s, ssid) &&
1231 ssid->key_mgmt == WPA_KEY_MGMT_WPS) {
1232 /*
1233 * Normal scan is more reliable and faster for WPS
1234 * operations and since these are for short periods of
1235 * time, the benefit of trying to use sched_scan would
1236 * be limited.
1237 */
1238 wpa_dbg(wpa_s, MSG_DEBUG, "Use normal scan instead of "
1239 "sched_scan for WPS");
1240 return -1;
1241 }
1242 #endif /* CONFIG_WPS */
1243 }
1244 if (wildcard)
1245 need_ssids++;
1246
1247 if (wpa_s->normal_scans < 3 &&
1248 (need_ssids <= wpa_s->max_scan_ssids ||
1249 wpa_s->max_scan_ssids >= (int) max_sched_scan_ssids)) {
1250 /*
1251 * When normal scan can speed up operations, use that for the
1252 * first operations before starting the sched_scan to allow
1253 * user space sleep more. We do this only if the normal scan
1254 * has functionality that is suitable for this or if the
1255 * sched_scan does not have better support for multiple SSIDs.
1256 */
1257 wpa_dbg(wpa_s, MSG_DEBUG, "Use normal scan instead of "
1258 "sched_scan for initial scans (normal_scans=%d)",
1259 wpa_s->normal_scans);
1260 return -1;
1261 }
1262
1263 os_memset(¶ms, 0, sizeof(params));
1264
1265 /* If we can't allocate space for the filters, we just don't filter */
1266 params.filter_ssids = os_calloc(wpa_s->max_match_sets,
1267 sizeof(struct wpa_driver_scan_filter));
1268
1269 prev_state = wpa_s->wpa_state;
1270 if (wpa_s->wpa_state == WPA_DISCONNECTED ||
1271 wpa_s->wpa_state == WPA_INACTIVE)
1272 wpa_supplicant_set_state(wpa_s, WPA_SCANNING);
1273
1274 if (wpa_s->autoscan_params != NULL) {
1275 scan_params = wpa_s->autoscan_params;
1276 goto scan;
1277 }
1278
1279 /* Find the starting point from which to continue scanning */
1280 ssid = wpa_s->conf->ssid;
1281 if (wpa_s->prev_sched_ssid) {
1282 while (ssid) {
1283 if (ssid == wpa_s->prev_sched_ssid) {
1284 ssid = ssid->next;
1285 break;
1286 }
1287 ssid = ssid->next;
1288 }
1289 }
1290
1291 if (!ssid || !wpa_s->prev_sched_ssid) {
1292 wpa_dbg(wpa_s, MSG_DEBUG, "Beginning of SSID list");
1293 wpa_s->sched_scan_timeout = max_sched_scan_ssids * 2;
1294 wpa_s->first_sched_scan = 1;
1295 ssid = wpa_s->conf->ssid;
1296 wpa_s->prev_sched_ssid = ssid;
1297 }
1298
1299 if (wildcard) {
1300 wpa_dbg(wpa_s, MSG_DEBUG, "Add wildcard SSID to sched_scan");
1301 params.num_ssids++;
1302 }
1303
1304 while (ssid) {
1305 if (wpas_network_disabled(wpa_s, ssid))
1306 goto next;
1307
1308 if (params.num_filter_ssids < wpa_s->max_match_sets &&
1309 params.filter_ssids && ssid->ssid && ssid->ssid_len) {
1310 wpa_dbg(wpa_s, MSG_DEBUG, "add to filter ssid: %s",
1311 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
1312 os_memcpy(params.filter_ssids[params.num_filter_ssids].ssid,
1313 ssid->ssid, ssid->ssid_len);
1314 params.filter_ssids[params.num_filter_ssids].ssid_len =
1315 ssid->ssid_len;
1316 params.num_filter_ssids++;
1317 } else if (params.filter_ssids && ssid->ssid && ssid->ssid_len)
1318 {
1319 wpa_dbg(wpa_s, MSG_DEBUG, "Not enough room for SSID "
1320 "filter for sched_scan - drop filter");
1321 os_free(params.filter_ssids);
1322 params.filter_ssids = NULL;
1323 params.num_filter_ssids = 0;
1324 }
1325
1326 if (ssid->scan_ssid && ssid->ssid && ssid->ssid_len) {
1327 if (params.num_ssids == max_sched_scan_ssids)
1328 break; /* only room for broadcast SSID */
1329 wpa_dbg(wpa_s, MSG_DEBUG,
1330 "add to active scan ssid: %s",
1331 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
1332 params.ssids[params.num_ssids].ssid =
1333 ssid->ssid;
1334 params.ssids[params.num_ssids].ssid_len =
1335 ssid->ssid_len;
1336 params.num_ssids++;
1337 if (params.num_ssids >= max_sched_scan_ssids) {
1338 wpa_s->prev_sched_ssid = ssid;
1339 do {
1340 ssid = ssid->next;
1341 } while (ssid &&
1342 (wpas_network_disabled(wpa_s, ssid) ||
1343 !ssid->scan_ssid));
1344 break;
1345 }
1346 }
1347
1348 next:
1349 wpa_s->prev_sched_ssid = ssid;
1350 ssid = ssid->next;
1351 }
1352
1353 if (params.num_filter_ssids == 0) {
1354 os_free(params.filter_ssids);
1355 params.filter_ssids = NULL;
1356 }
1357
1358 extra_ie = wpa_supplicant_extra_ies(wpa_s);
1359 if (extra_ie) {
1360 params.extra_ies = wpabuf_head(extra_ie);
1361 params.extra_ies_len = wpabuf_len(extra_ie);
1362 }
1363
1364 if (wpa_s->conf->filter_rssi)
1365 params.filter_rssi = wpa_s->conf->filter_rssi;
1366
1367 /* See if user specified frequencies. If so, scan only those. */
1368 if (wpa_s->conf->freq_list && !params.freqs) {
1369 wpa_dbg(wpa_s, MSG_DEBUG,
1370 "Optimize scan based on conf->freq_list");
1371 int_array_concat(¶ms.freqs, wpa_s->conf->freq_list);
1372 }
1373
1374 scan_params = ¶ms;
1375
1376 scan:
1377 wpa_s->sched_scan_timed_out = 0;
1378
1379 /*
1380 * We cannot support multiple scan plans if the scan request includes
1381 * too many SSID's, so in this case use only the last scan plan and make
1382 * it run infinitely. It will be stopped by the timeout.
1383 */
1384 if (wpa_s->sched_scan_plans_num == 1 ||
1385 (wpa_s->sched_scan_plans_num && !ssid && wpa_s->first_sched_scan)) {
1386 params.sched_scan_plans = wpa_s->sched_scan_plans;
1387 params.sched_scan_plans_num = wpa_s->sched_scan_plans_num;
1388 } else if (wpa_s->sched_scan_plans_num > 1) {
1389 wpa_dbg(wpa_s, MSG_DEBUG,
1390 "Too many SSIDs. Default to using single scheduled_scan plan");
1391 params.sched_scan_plans =
1392 &wpa_s->sched_scan_plans[wpa_s->sched_scan_plans_num -
1393 1];
1394 params.sched_scan_plans_num = 1;
1395 } else {
1396 if (wpa_s->conf->sched_scan_interval)
1397 scan_plan.interval = wpa_s->conf->sched_scan_interval;
1398 else
1399 scan_plan.interval = 10;
1400
1401 if (scan_plan.interval > wpa_s->max_sched_scan_plan_interval) {
1402 wpa_printf(MSG_WARNING,
1403 "Scan interval too long(%u), use the maximum allowed(%u)",
1404 scan_plan.interval,
1405 wpa_s->max_sched_scan_plan_interval);
1406 scan_plan.interval =
1407 wpa_s->max_sched_scan_plan_interval;
1408 }
1409
1410 scan_plan.iterations = 0;
1411 params.sched_scan_plans = &scan_plan;
1412 params.sched_scan_plans_num = 1;
1413 }
1414
1415 if (ssid || !wpa_s->first_sched_scan) {
1416 wpa_dbg(wpa_s, MSG_DEBUG,
1417 "Starting sched scan: interval %u timeout %d",
1418 params.sched_scan_plans[0].interval,
1419 wpa_s->sched_scan_timeout);
1420 } else {
1421 wpa_dbg(wpa_s, MSG_DEBUG, "Starting sched scan (no timeout)");
1422 }
1423
1424 wpa_setband_scan_freqs(wpa_s, scan_params);
1425
1426 if (wpa_s->mac_addr_rand_enable & MAC_ADDR_RAND_SCHED_SCAN) {
1427 params.mac_addr_rand = 1;
1428 if (wpa_s->mac_addr_sched_scan) {
1429 params.mac_addr = wpa_s->mac_addr_sched_scan;
1430 params.mac_addr_mask = wpa_s->mac_addr_sched_scan +
1431 ETH_ALEN;
1432 }
1433 }
1434
1435 ret = wpa_supplicant_start_sched_scan(wpa_s, scan_params);
1436 wpabuf_free(extra_ie);
1437 os_free(params.filter_ssids);
1438 if (ret) {
1439 wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate sched scan");
1440 if (prev_state != wpa_s->wpa_state)
1441 wpa_supplicant_set_state(wpa_s, prev_state);
1442 return ret;
1443 }
1444
1445 /* If we have more SSIDs to scan, add a timeout so we scan them too */
1446 if (ssid || !wpa_s->first_sched_scan) {
1447 wpa_s->sched_scan_timed_out = 0;
1448 eloop_register_timeout(wpa_s->sched_scan_timeout, 0,
1449 wpa_supplicant_sched_scan_timeout,
1450 wpa_s, NULL);
1451 wpa_s->first_sched_scan = 0;
1452 wpa_s->sched_scan_timeout /= 2;
1453 params.sched_scan_plans[0].interval *= 2;
1454 if ((unsigned int) wpa_s->sched_scan_timeout <
1455 params.sched_scan_plans[0].interval ||
1456 params.sched_scan_plans[0].interval >
1457 wpa_s->max_sched_scan_plan_interval) {
1458 params.sched_scan_plans[0].interval = 10;
1459 wpa_s->sched_scan_timeout = max_sched_scan_ssids * 2;
1460 }
1461 }
1462
1463 /* If there is no more ssids, start next time from the beginning */
1464 if (!ssid)
1465 wpa_s->prev_sched_ssid = NULL;
1466
1467 return 0;
1468 }
1469
1470
1471 /**
1472 * wpa_supplicant_cancel_scan - Cancel a scheduled scan request
1473 * @wpa_s: Pointer to wpa_supplicant data
1474 *
1475 * This function is used to cancel a scan request scheduled with
1476 * wpa_supplicant_req_scan().
1477 */
wpa_supplicant_cancel_scan(struct wpa_supplicant * wpa_s)1478 void wpa_supplicant_cancel_scan(struct wpa_supplicant *wpa_s)
1479 {
1480 wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling scan request");
1481 eloop_cancel_timeout(wpa_supplicant_scan, wpa_s, NULL);
1482 }
1483
1484
1485 /**
1486 * wpa_supplicant_cancel_delayed_sched_scan - Stop a delayed scheduled scan
1487 * @wpa_s: Pointer to wpa_supplicant data
1488 *
1489 * This function is used to stop a delayed scheduled scan.
1490 */
wpa_supplicant_cancel_delayed_sched_scan(struct wpa_supplicant * wpa_s)1491 void wpa_supplicant_cancel_delayed_sched_scan(struct wpa_supplicant *wpa_s)
1492 {
1493 if (!wpa_s->sched_scan_supported)
1494 return;
1495
1496 wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling delayed sched scan");
1497 eloop_cancel_timeout(wpa_supplicant_delayed_sched_scan_timeout,
1498 wpa_s, NULL);
1499 }
1500
1501
1502 /**
1503 * wpa_supplicant_cancel_sched_scan - Stop running scheduled scans
1504 * @wpa_s: Pointer to wpa_supplicant data
1505 *
1506 * This function is used to stop a periodic scheduled scan.
1507 */
wpa_supplicant_cancel_sched_scan(struct wpa_supplicant * wpa_s)1508 void wpa_supplicant_cancel_sched_scan(struct wpa_supplicant *wpa_s)
1509 {
1510 if (!wpa_s->sched_scanning)
1511 return;
1512
1513 wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling sched scan");
1514 eloop_cancel_timeout(wpa_supplicant_sched_scan_timeout, wpa_s, NULL);
1515 wpa_supplicant_stop_sched_scan(wpa_s);
1516 }
1517
1518
1519 /**
1520 * wpa_supplicant_notify_scanning - Indicate possible scan state change
1521 * @wpa_s: Pointer to wpa_supplicant data
1522 * @scanning: Whether scanning is currently in progress
1523 *
1524 * This function is to generate scanning notifycations. It is called whenever
1525 * there may have been a change in scanning (scan started, completed, stopped).
1526 * wpas_notify_scanning() is called whenever the scanning state changed from the
1527 * previously notified state.
1528 */
wpa_supplicant_notify_scanning(struct wpa_supplicant * wpa_s,int scanning)1529 void wpa_supplicant_notify_scanning(struct wpa_supplicant *wpa_s,
1530 int scanning)
1531 {
1532 if (wpa_s->scanning != scanning) {
1533 wpa_s->scanning = scanning;
1534 wpas_notify_scanning(wpa_s);
1535 }
1536 }
1537
1538
wpa_scan_get_max_rate(const struct wpa_scan_res * res)1539 static int wpa_scan_get_max_rate(const struct wpa_scan_res *res)
1540 {
1541 int rate = 0;
1542 const u8 *ie;
1543 int i;
1544
1545 ie = wpa_scan_get_ie(res, WLAN_EID_SUPP_RATES);
1546 for (i = 0; ie && i < ie[1]; i++) {
1547 if ((ie[i + 2] & 0x7f) > rate)
1548 rate = ie[i + 2] & 0x7f;
1549 }
1550
1551 ie = wpa_scan_get_ie(res, WLAN_EID_EXT_SUPP_RATES);
1552 for (i = 0; ie && i < ie[1]; i++) {
1553 if ((ie[i + 2] & 0x7f) > rate)
1554 rate = ie[i + 2] & 0x7f;
1555 }
1556
1557 return rate;
1558 }
1559
1560
1561 /**
1562 * wpa_scan_get_ie - Fetch a specified information element from a scan result
1563 * @res: Scan result entry
1564 * @ie: Information element identitifier (WLAN_EID_*)
1565 * Returns: Pointer to the information element (id field) or %NULL if not found
1566 *
1567 * This function returns the first matching information element in the scan
1568 * result.
1569 */
wpa_scan_get_ie(const struct wpa_scan_res * res,u8 ie)1570 const u8 * wpa_scan_get_ie(const struct wpa_scan_res *res, u8 ie)
1571 {
1572 return get_ie((const u8 *) (res + 1), res->ie_len, ie);
1573 }
1574
1575
1576 /**
1577 * wpa_scan_get_vendor_ie - Fetch vendor information element from a scan result
1578 * @res: Scan result entry
1579 * @vendor_type: Vendor type (four octets starting the IE payload)
1580 * Returns: Pointer to the information element (id field) or %NULL if not found
1581 *
1582 * This function returns the first matching information element in the scan
1583 * result.
1584 */
wpa_scan_get_vendor_ie(const struct wpa_scan_res * res,u32 vendor_type)1585 const u8 * wpa_scan_get_vendor_ie(const struct wpa_scan_res *res,
1586 u32 vendor_type)
1587 {
1588 const u8 *end, *pos;
1589
1590 pos = (const u8 *) (res + 1);
1591 end = pos + res->ie_len;
1592
1593 while (end - pos > 1) {
1594 if (2 + pos[1] > end - pos)
1595 break;
1596 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1597 vendor_type == WPA_GET_BE32(&pos[2]))
1598 return pos;
1599 pos += 2 + pos[1];
1600 }
1601
1602 return NULL;
1603 }
1604
1605
1606 /**
1607 * wpa_scan_get_vendor_ie_beacon - Fetch vendor information from a scan result
1608 * @res: Scan result entry
1609 * @vendor_type: Vendor type (four octets starting the IE payload)
1610 * Returns: Pointer to the information element (id field) or %NULL if not found
1611 *
1612 * This function returns the first matching information element in the scan
1613 * result.
1614 *
1615 * This function is like wpa_scan_get_vendor_ie(), but uses IE buffer only
1616 * from Beacon frames instead of either Beacon or Probe Response frames.
1617 */
wpa_scan_get_vendor_ie_beacon(const struct wpa_scan_res * res,u32 vendor_type)1618 const u8 * wpa_scan_get_vendor_ie_beacon(const struct wpa_scan_res *res,
1619 u32 vendor_type)
1620 {
1621 const u8 *end, *pos;
1622
1623 if (res->beacon_ie_len == 0)
1624 return NULL;
1625
1626 pos = (const u8 *) (res + 1);
1627 pos += res->ie_len;
1628 end = pos + res->beacon_ie_len;
1629
1630 while (end - pos > 1) {
1631 if (2 + pos[1] > end - pos)
1632 break;
1633 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1634 vendor_type == WPA_GET_BE32(&pos[2]))
1635 return pos;
1636 pos += 2 + pos[1];
1637 }
1638
1639 return NULL;
1640 }
1641
1642
1643 /**
1644 * wpa_scan_get_vendor_ie_multi - Fetch vendor IE data from a scan result
1645 * @res: Scan result entry
1646 * @vendor_type: Vendor type (four octets starting the IE payload)
1647 * Returns: Pointer to the information element payload or %NULL if not found
1648 *
1649 * This function returns concatenated payload of possibly fragmented vendor
1650 * specific information elements in the scan result. The caller is responsible
1651 * for freeing the returned buffer.
1652 */
wpa_scan_get_vendor_ie_multi(const struct wpa_scan_res * res,u32 vendor_type)1653 struct wpabuf * wpa_scan_get_vendor_ie_multi(const struct wpa_scan_res *res,
1654 u32 vendor_type)
1655 {
1656 struct wpabuf *buf;
1657 const u8 *end, *pos;
1658
1659 buf = wpabuf_alloc(res->ie_len);
1660 if (buf == NULL)
1661 return NULL;
1662
1663 pos = (const u8 *) (res + 1);
1664 end = pos + res->ie_len;
1665
1666 while (end - pos > 1) {
1667 if (2 + pos[1] > end - pos)
1668 break;
1669 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1670 vendor_type == WPA_GET_BE32(&pos[2]))
1671 wpabuf_put_data(buf, pos + 2 + 4, pos[1] - 4);
1672 pos += 2 + pos[1];
1673 }
1674
1675 if (wpabuf_len(buf) == 0) {
1676 wpabuf_free(buf);
1677 buf = NULL;
1678 }
1679
1680 return buf;
1681 }
1682
1683
1684 /*
1685 * Channels with a great SNR can operate at full rate. What is a great SNR?
1686 * This doc https://supportforums.cisco.com/docs/DOC-12954 says, "the general
1687 * rule of thumb is that any SNR above 20 is good." This one
1688 * http://www.cisco.com/en/US/tech/tk722/tk809/technologies_q_and_a_item09186a00805e9a96.shtml#qa23
1689 * recommends 25 as a minimum SNR for 54 Mbps data rate. 30 is chosen here as a
1690 * conservative value.
1691 */
1692 #define GREAT_SNR 30
1693
1694 #define IS_5GHZ(n) (n > 4000)
1695
1696 /* Compare function for sorting scan results. Return >0 if @b is considered
1697 * better. */
wpa_scan_result_compar(const void * a,const void * b)1698 static int wpa_scan_result_compar(const void *a, const void *b)
1699 {
1700 #define MIN(a,b) a < b ? a : b
1701 struct wpa_scan_res **_wa = (void *) a;
1702 struct wpa_scan_res **_wb = (void *) b;
1703 struct wpa_scan_res *wa = *_wa;
1704 struct wpa_scan_res *wb = *_wb;
1705 int wpa_a, wpa_b;
1706 int snr_a, snr_b, snr_a_full, snr_b_full;
1707
1708 /* WPA/WPA2 support preferred */
1709 wpa_a = wpa_scan_get_vendor_ie(wa, WPA_IE_VENDOR_TYPE) != NULL ||
1710 wpa_scan_get_ie(wa, WLAN_EID_RSN) != NULL;
1711 wpa_b = wpa_scan_get_vendor_ie(wb, WPA_IE_VENDOR_TYPE) != NULL ||
1712 wpa_scan_get_ie(wb, WLAN_EID_RSN) != NULL;
1713
1714 if (wpa_b && !wpa_a)
1715 return 1;
1716 if (!wpa_b && wpa_a)
1717 return -1;
1718
1719 /* privacy support preferred */
1720 if ((wa->caps & IEEE80211_CAP_PRIVACY) == 0 &&
1721 (wb->caps & IEEE80211_CAP_PRIVACY))
1722 return 1;
1723 if ((wa->caps & IEEE80211_CAP_PRIVACY) &&
1724 (wb->caps & IEEE80211_CAP_PRIVACY) == 0)
1725 return -1;
1726
1727 if (wa->flags & wb->flags & WPA_SCAN_LEVEL_DBM) {
1728 snr_a_full = wa->snr;
1729 snr_a = MIN(wa->snr, GREAT_SNR);
1730 snr_b_full = wb->snr;
1731 snr_b = MIN(wb->snr, GREAT_SNR);
1732 } else {
1733 /* Level is not in dBm, so we can't calculate
1734 * SNR. Just use raw level (units unknown). */
1735 snr_a = snr_a_full = wa->level;
1736 snr_b = snr_b_full = wb->level;
1737 }
1738
1739 /* if SNR is close, decide by max rate or frequency band */
1740 if ((snr_a && snr_b && abs(snr_b - snr_a) < 5) ||
1741 (wa->qual && wb->qual && abs(wb->qual - wa->qual) < 10)) {
1742 if (wa->est_throughput != wb->est_throughput)
1743 return wb->est_throughput - wa->est_throughput;
1744 if (IS_5GHZ(wa->freq) ^ IS_5GHZ(wb->freq))
1745 return IS_5GHZ(wa->freq) ? -1 : 1;
1746 }
1747
1748 /* all things being equal, use SNR; if SNRs are
1749 * identical, use quality values since some drivers may only report
1750 * that value and leave the signal level zero */
1751 if (snr_b_full == snr_a_full)
1752 return wb->qual - wa->qual;
1753 return snr_b_full - snr_a_full;
1754 #undef MIN
1755 }
1756
1757
1758 #ifdef CONFIG_WPS
1759 /* Compare function for sorting scan results when searching a WPS AP for
1760 * provisioning. Return >0 if @b is considered better. */
wpa_scan_result_wps_compar(const void * a,const void * b)1761 static int wpa_scan_result_wps_compar(const void *a, const void *b)
1762 {
1763 struct wpa_scan_res **_wa = (void *) a;
1764 struct wpa_scan_res **_wb = (void *) b;
1765 struct wpa_scan_res *wa = *_wa;
1766 struct wpa_scan_res *wb = *_wb;
1767 int uses_wps_a, uses_wps_b;
1768 struct wpabuf *wps_a, *wps_b;
1769 int res;
1770
1771 /* Optimization - check WPS IE existence before allocated memory and
1772 * doing full reassembly. */
1773 uses_wps_a = wpa_scan_get_vendor_ie(wa, WPS_IE_VENDOR_TYPE) != NULL;
1774 uses_wps_b = wpa_scan_get_vendor_ie(wb, WPS_IE_VENDOR_TYPE) != NULL;
1775 if (uses_wps_a && !uses_wps_b)
1776 return -1;
1777 if (!uses_wps_a && uses_wps_b)
1778 return 1;
1779
1780 if (uses_wps_a && uses_wps_b) {
1781 wps_a = wpa_scan_get_vendor_ie_multi(wa, WPS_IE_VENDOR_TYPE);
1782 wps_b = wpa_scan_get_vendor_ie_multi(wb, WPS_IE_VENDOR_TYPE);
1783 res = wps_ap_priority_compar(wps_a, wps_b);
1784 wpabuf_free(wps_a);
1785 wpabuf_free(wps_b);
1786 if (res)
1787 return res;
1788 }
1789
1790 /*
1791 * Do not use current AP security policy as a sorting criteria during
1792 * WPS provisioning step since the AP may get reconfigured at the
1793 * completion of provisioning.
1794 */
1795
1796 /* all things being equal, use signal level; if signal levels are
1797 * identical, use quality values since some drivers may only report
1798 * that value and leave the signal level zero */
1799 if (wb->level == wa->level)
1800 return wb->qual - wa->qual;
1801 return wb->level - wa->level;
1802 }
1803 #endif /* CONFIG_WPS */
1804
1805
dump_scan_res(struct wpa_scan_results * scan_res)1806 static void dump_scan_res(struct wpa_scan_results *scan_res)
1807 {
1808 #ifndef CONFIG_NO_STDOUT_DEBUG
1809 size_t i;
1810
1811 if (scan_res->res == NULL || scan_res->num == 0)
1812 return;
1813
1814 wpa_printf(MSG_EXCESSIVE, "Sorted scan results");
1815
1816 for (i = 0; i < scan_res->num; i++) {
1817 struct wpa_scan_res *r = scan_res->res[i];
1818 u8 *pos;
1819 if (r->flags & WPA_SCAN_LEVEL_DBM) {
1820 int noise_valid = !(r->flags & WPA_SCAN_NOISE_INVALID);
1821
1822 wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d "
1823 "noise=%d%s level=%d snr=%d%s flags=0x%x age=%u est=%u",
1824 MAC2STR(r->bssid), r->freq, r->qual,
1825 r->noise, noise_valid ? "" : "~", r->level,
1826 r->snr, r->snr >= GREAT_SNR ? "*" : "",
1827 r->flags,
1828 r->age, r->est_throughput);
1829 } else {
1830 wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d "
1831 "noise=%d level=%d flags=0x%x age=%u est=%u",
1832 MAC2STR(r->bssid), r->freq, r->qual,
1833 r->noise, r->level, r->flags, r->age,
1834 r->est_throughput);
1835 }
1836 pos = (u8 *) (r + 1);
1837 if (r->ie_len)
1838 wpa_hexdump(MSG_EXCESSIVE, "IEs", pos, r->ie_len);
1839 pos += r->ie_len;
1840 if (r->beacon_ie_len)
1841 wpa_hexdump(MSG_EXCESSIVE, "Beacon IEs",
1842 pos, r->beacon_ie_len);
1843 }
1844 #endif /* CONFIG_NO_STDOUT_DEBUG */
1845 }
1846
1847
1848 /**
1849 * wpa_supplicant_filter_bssid_match - Is the specified BSSID allowed
1850 * @wpa_s: Pointer to wpa_supplicant data
1851 * @bssid: BSSID to check
1852 * Returns: 0 if the BSSID is filtered or 1 if not
1853 *
1854 * This function is used to filter out specific BSSIDs from scan reslts mainly
1855 * for testing purposes (SET bssid_filter ctrl_iface command).
1856 */
wpa_supplicant_filter_bssid_match(struct wpa_supplicant * wpa_s,const u8 * bssid)1857 int wpa_supplicant_filter_bssid_match(struct wpa_supplicant *wpa_s,
1858 const u8 *bssid)
1859 {
1860 size_t i;
1861
1862 if (wpa_s->bssid_filter == NULL)
1863 return 1;
1864
1865 for (i = 0; i < wpa_s->bssid_filter_count; i++) {
1866 if (os_memcmp(wpa_s->bssid_filter + i * ETH_ALEN, bssid,
1867 ETH_ALEN) == 0)
1868 return 1;
1869 }
1870
1871 return 0;
1872 }
1873
1874
filter_scan_res(struct wpa_supplicant * wpa_s,struct wpa_scan_results * res)1875 static void filter_scan_res(struct wpa_supplicant *wpa_s,
1876 struct wpa_scan_results *res)
1877 {
1878 size_t i, j;
1879
1880 if (wpa_s->bssid_filter == NULL)
1881 return;
1882
1883 for (i = 0, j = 0; i < res->num; i++) {
1884 if (wpa_supplicant_filter_bssid_match(wpa_s,
1885 res->res[i]->bssid)) {
1886 res->res[j++] = res->res[i];
1887 } else {
1888 os_free(res->res[i]);
1889 res->res[i] = NULL;
1890 }
1891 }
1892
1893 if (res->num != j) {
1894 wpa_printf(MSG_DEBUG, "Filtered out %d scan results",
1895 (int) (res->num - j));
1896 res->num = j;
1897 }
1898 }
1899
1900
1901 /*
1902 * Noise floor values to use when we have signal strength
1903 * measurements, but no noise floor measurements. These values were
1904 * measured in an office environment with many APs.
1905 */
1906 #define DEFAULT_NOISE_FLOOR_2GHZ (-89)
1907 #define DEFAULT_NOISE_FLOOR_5GHZ (-92)
1908
scan_snr(struct wpa_scan_res * res)1909 static void scan_snr(struct wpa_scan_res *res)
1910 {
1911 if (res->flags & WPA_SCAN_NOISE_INVALID) {
1912 res->noise = IS_5GHZ(res->freq) ?
1913 DEFAULT_NOISE_FLOOR_5GHZ :
1914 DEFAULT_NOISE_FLOOR_2GHZ;
1915 }
1916
1917 if (res->flags & WPA_SCAN_LEVEL_DBM) {
1918 res->snr = res->level - res->noise;
1919 } else {
1920 /* Level is not in dBm, so we can't calculate
1921 * SNR. Just use raw level (units unknown). */
1922 res->snr = res->level;
1923 }
1924 }
1925
1926
max_ht20_rate(int snr)1927 static unsigned int max_ht20_rate(int snr)
1928 {
1929 if (snr < 6)
1930 return 6500; /* HT20 MCS0 */
1931 if (snr < 8)
1932 return 13000; /* HT20 MCS1 */
1933 if (snr < 13)
1934 return 19500; /* HT20 MCS2 */
1935 if (snr < 17)
1936 return 26000; /* HT20 MCS3 */
1937 if (snr < 20)
1938 return 39000; /* HT20 MCS4 */
1939 if (snr < 23)
1940 return 52000; /* HT20 MCS5 */
1941 if (snr < 24)
1942 return 58500; /* HT20 MCS6 */
1943 return 65000; /* HT20 MCS7 */
1944 }
1945
1946
max_ht40_rate(int snr)1947 static unsigned int max_ht40_rate(int snr)
1948 {
1949 if (snr < 3)
1950 return 13500; /* HT40 MCS0 */
1951 if (snr < 6)
1952 return 27000; /* HT40 MCS1 */
1953 if (snr < 10)
1954 return 40500; /* HT40 MCS2 */
1955 if (snr < 15)
1956 return 54000; /* HT40 MCS3 */
1957 if (snr < 17)
1958 return 81000; /* HT40 MCS4 */
1959 if (snr < 22)
1960 return 108000; /* HT40 MCS5 */
1961 if (snr < 24)
1962 return 121500; /* HT40 MCS6 */
1963 return 135000; /* HT40 MCS7 */
1964 }
1965
1966
max_vht80_rate(int snr)1967 static unsigned int max_vht80_rate(int snr)
1968 {
1969 if (snr < 1)
1970 return 0;
1971 if (snr < 2)
1972 return 29300; /* VHT80 MCS0 */
1973 if (snr < 5)
1974 return 58500; /* VHT80 MCS1 */
1975 if (snr < 9)
1976 return 87800; /* VHT80 MCS2 */
1977 if (snr < 11)
1978 return 117000; /* VHT80 MCS3 */
1979 if (snr < 15)
1980 return 175500; /* VHT80 MCS4 */
1981 if (snr < 16)
1982 return 234000; /* VHT80 MCS5 */
1983 if (snr < 18)
1984 return 263300; /* VHT80 MCS6 */
1985 if (snr < 20)
1986 return 292500; /* VHT80 MCS7 */
1987 if (snr < 22)
1988 return 351000; /* VHT80 MCS8 */
1989 return 390000; /* VHT80 MCS9 */
1990 }
1991
1992
scan_est_throughput(struct wpa_supplicant * wpa_s,struct wpa_scan_res * res)1993 static void scan_est_throughput(struct wpa_supplicant *wpa_s,
1994 struct wpa_scan_res *res)
1995 {
1996 enum local_hw_capab capab = wpa_s->hw_capab;
1997 int rate; /* max legacy rate in 500 kb/s units */
1998 const u8 *ie;
1999 unsigned int est, tmp;
2000 int snr = res->snr;
2001
2002 if (res->est_throughput)
2003 return;
2004
2005 /* Get maximum legacy rate */
2006 rate = wpa_scan_get_max_rate(res);
2007
2008 /* Limit based on estimated SNR */
2009 if (rate > 1 * 2 && snr < 1)
2010 rate = 1 * 2;
2011 else if (rate > 2 * 2 && snr < 4)
2012 rate = 2 * 2;
2013 else if (rate > 6 * 2 && snr < 5)
2014 rate = 6 * 2;
2015 else if (rate > 9 * 2 && snr < 6)
2016 rate = 9 * 2;
2017 else if (rate > 12 * 2 && snr < 7)
2018 rate = 12 * 2;
2019 else if (rate > 18 * 2 && snr < 10)
2020 rate = 18 * 2;
2021 else if (rate > 24 * 2 && snr < 11)
2022 rate = 24 * 2;
2023 else if (rate > 36 * 2 && snr < 15)
2024 rate = 36 * 2;
2025 else if (rate > 48 * 2 && snr < 19)
2026 rate = 48 * 2;
2027 else if (rate > 54 * 2 && snr < 21)
2028 rate = 54 * 2;
2029 est = rate * 500;
2030
2031 if (capab == CAPAB_HT || capab == CAPAB_HT40 || capab == CAPAB_VHT) {
2032 ie = wpa_scan_get_ie(res, WLAN_EID_HT_CAP);
2033 if (ie) {
2034 tmp = max_ht20_rate(snr);
2035 if (tmp > est)
2036 est = tmp;
2037 }
2038 }
2039
2040 if (capab == CAPAB_HT40 || capab == CAPAB_VHT) {
2041 ie = wpa_scan_get_ie(res, WLAN_EID_HT_OPERATION);
2042 if (ie && ie[1] >= 2 &&
2043 (ie[3] & HT_INFO_HT_PARAM_SECONDARY_CHNL_OFF_MASK)) {
2044 tmp = max_ht40_rate(snr);
2045 if (tmp > est)
2046 est = tmp;
2047 }
2048 }
2049
2050 if (capab == CAPAB_VHT) {
2051 /* Use +1 to assume VHT is always faster than HT */
2052 ie = wpa_scan_get_ie(res, WLAN_EID_VHT_CAP);
2053 if (ie) {
2054 tmp = max_ht20_rate(snr) + 1;
2055 if (tmp > est)
2056 est = tmp;
2057
2058 ie = wpa_scan_get_ie(res, WLAN_EID_HT_OPERATION);
2059 if (ie && ie[1] >= 2 &&
2060 (ie[3] &
2061 HT_INFO_HT_PARAM_SECONDARY_CHNL_OFF_MASK)) {
2062 tmp = max_ht40_rate(snr) + 1;
2063 if (tmp > est)
2064 est = tmp;
2065 }
2066
2067 ie = wpa_scan_get_ie(res, WLAN_EID_VHT_OPERATION);
2068 if (ie && ie[1] >= 1 &&
2069 (ie[2] & VHT_OPMODE_CHANNEL_WIDTH_MASK)) {
2070 tmp = max_vht80_rate(snr) + 1;
2071 if (tmp > est)
2072 est = tmp;
2073 }
2074 }
2075 }
2076
2077 /* TODO: channel utilization and AP load (e.g., from AP Beacon) */
2078
2079 res->est_throughput = est;
2080 }
2081
2082
2083 /**
2084 * wpa_supplicant_get_scan_results - Get scan results
2085 * @wpa_s: Pointer to wpa_supplicant data
2086 * @info: Information about what was scanned or %NULL if not available
2087 * @new_scan: Whether a new scan was performed
2088 * Returns: Scan results, %NULL on failure
2089 *
2090 * This function request the current scan results from the driver and updates
2091 * the local BSS list wpa_s->bss. The caller is responsible for freeing the
2092 * results with wpa_scan_results_free().
2093 */
2094 struct wpa_scan_results *
wpa_supplicant_get_scan_results(struct wpa_supplicant * wpa_s,struct scan_info * info,int new_scan)2095 wpa_supplicant_get_scan_results(struct wpa_supplicant *wpa_s,
2096 struct scan_info *info, int new_scan)
2097 {
2098 struct wpa_scan_results *scan_res;
2099 size_t i;
2100 int (*compar)(const void *, const void *) = wpa_scan_result_compar;
2101
2102 scan_res = wpa_drv_get_scan_results2(wpa_s);
2103 if (scan_res == NULL) {
2104 wpa_dbg(wpa_s, MSG_DEBUG, "Failed to get scan results");
2105 return NULL;
2106 }
2107 if (scan_res->fetch_time.sec == 0) {
2108 /*
2109 * Make sure we have a valid timestamp if the driver wrapper
2110 * does not set this.
2111 */
2112 os_get_reltime(&scan_res->fetch_time);
2113 }
2114 filter_scan_res(wpa_s, scan_res);
2115
2116 for (i = 0; i < scan_res->num; i++) {
2117 struct wpa_scan_res *scan_res_item = scan_res->res[i];
2118
2119 scan_snr(scan_res_item);
2120 scan_est_throughput(wpa_s, scan_res_item);
2121 }
2122
2123 #ifdef CONFIG_WPS
2124 if (wpas_wps_searching(wpa_s)) {
2125 wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Order scan results with WPS "
2126 "provisioning rules");
2127 compar = wpa_scan_result_wps_compar;
2128 }
2129 #endif /* CONFIG_WPS */
2130
2131 qsort(scan_res->res, scan_res->num, sizeof(struct wpa_scan_res *),
2132 compar);
2133 dump_scan_res(scan_res);
2134
2135 wpa_bss_update_start(wpa_s);
2136 for (i = 0; i < scan_res->num; i++)
2137 wpa_bss_update_scan_res(wpa_s, scan_res->res[i],
2138 &scan_res->fetch_time);
2139 wpa_bss_update_end(wpa_s, info, new_scan);
2140
2141 return scan_res;
2142 }
2143
2144
2145 /**
2146 * wpa_supplicant_update_scan_results - Update scan results from the driver
2147 * @wpa_s: Pointer to wpa_supplicant data
2148 * Returns: 0 on success, -1 on failure
2149 *
2150 * This function updates the BSS table within wpa_supplicant based on the
2151 * currently available scan results from the driver without requesting a new
2152 * scan. This is used in cases where the driver indicates an association
2153 * (including roaming within ESS) and wpa_supplicant does not yet have the
2154 * needed information to complete the connection (e.g., to perform validation
2155 * steps in 4-way handshake).
2156 */
wpa_supplicant_update_scan_results(struct wpa_supplicant * wpa_s)2157 int wpa_supplicant_update_scan_results(struct wpa_supplicant *wpa_s)
2158 {
2159 struct wpa_scan_results *scan_res;
2160 scan_res = wpa_supplicant_get_scan_results(wpa_s, NULL, 0);
2161 if (scan_res == NULL)
2162 return -1;
2163 wpa_scan_results_free(scan_res);
2164
2165 return 0;
2166 }
2167
2168
2169 /**
2170 * scan_only_handler - Reports scan results
2171 */
scan_only_handler(struct wpa_supplicant * wpa_s,struct wpa_scan_results * scan_res)2172 void scan_only_handler(struct wpa_supplicant *wpa_s,
2173 struct wpa_scan_results *scan_res)
2174 {
2175 wpa_dbg(wpa_s, MSG_DEBUG, "Scan-only results received");
2176 if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
2177 wpa_s->manual_scan_use_id && wpa_s->own_scan_running) {
2178 wpa_msg_ctrl(wpa_s, MSG_INFO, WPA_EVENT_SCAN_RESULTS "id=%u",
2179 wpa_s->manual_scan_id);
2180 wpa_s->manual_scan_use_id = 0;
2181 } else {
2182 wpa_msg_ctrl(wpa_s, MSG_INFO, WPA_EVENT_SCAN_RESULTS);
2183 }
2184 wpas_notify_scan_results(wpa_s);
2185 wpas_notify_scan_done(wpa_s, 1);
2186 if (wpa_s->scan_work) {
2187 struct wpa_radio_work *work = wpa_s->scan_work;
2188 wpa_s->scan_work = NULL;
2189 radio_work_done(work);
2190 }
2191
2192 if (wpa_s->wpa_state == WPA_SCANNING)
2193 wpa_supplicant_set_state(wpa_s, wpa_s->scan_prev_wpa_state);
2194 }
2195
2196
wpas_scan_scheduled(struct wpa_supplicant * wpa_s)2197 int wpas_scan_scheduled(struct wpa_supplicant *wpa_s)
2198 {
2199 return eloop_is_timeout_registered(wpa_supplicant_scan, wpa_s, NULL);
2200 }
2201
2202
2203 struct wpa_driver_scan_params *
wpa_scan_clone_params(const struct wpa_driver_scan_params * src)2204 wpa_scan_clone_params(const struct wpa_driver_scan_params *src)
2205 {
2206 struct wpa_driver_scan_params *params;
2207 size_t i;
2208 u8 *n;
2209
2210 params = os_zalloc(sizeof(*params));
2211 if (params == NULL)
2212 return NULL;
2213
2214 for (i = 0; i < src->num_ssids; i++) {
2215 if (src->ssids[i].ssid) {
2216 n = os_malloc(src->ssids[i].ssid_len);
2217 if (n == NULL)
2218 goto failed;
2219 os_memcpy(n, src->ssids[i].ssid,
2220 src->ssids[i].ssid_len);
2221 params->ssids[i].ssid = n;
2222 params->ssids[i].ssid_len = src->ssids[i].ssid_len;
2223 }
2224 }
2225 params->num_ssids = src->num_ssids;
2226
2227 if (src->extra_ies) {
2228 n = os_malloc(src->extra_ies_len);
2229 if (n == NULL)
2230 goto failed;
2231 os_memcpy(n, src->extra_ies, src->extra_ies_len);
2232 params->extra_ies = n;
2233 params->extra_ies_len = src->extra_ies_len;
2234 }
2235
2236 if (src->freqs) {
2237 int len = int_array_len(src->freqs);
2238 params->freqs = os_malloc((len + 1) * sizeof(int));
2239 if (params->freqs == NULL)
2240 goto failed;
2241 os_memcpy(params->freqs, src->freqs, (len + 1) * sizeof(int));
2242 }
2243
2244 if (src->filter_ssids) {
2245 params->filter_ssids = os_malloc(sizeof(*params->filter_ssids) *
2246 src->num_filter_ssids);
2247 if (params->filter_ssids == NULL)
2248 goto failed;
2249 os_memcpy(params->filter_ssids, src->filter_ssids,
2250 sizeof(*params->filter_ssids) *
2251 src->num_filter_ssids);
2252 params->num_filter_ssids = src->num_filter_ssids;
2253 }
2254
2255 params->filter_rssi = src->filter_rssi;
2256 params->p2p_probe = src->p2p_probe;
2257 params->only_new_results = src->only_new_results;
2258 params->low_priority = src->low_priority;
2259
2260 if (src->sched_scan_plans_num > 0) {
2261 params->sched_scan_plans =
2262 os_malloc(sizeof(*src->sched_scan_plans) *
2263 src->sched_scan_plans_num);
2264 if (!params->sched_scan_plans)
2265 goto failed;
2266
2267 os_memcpy(params->sched_scan_plans, src->sched_scan_plans,
2268 sizeof(*src->sched_scan_plans) *
2269 src->sched_scan_plans_num);
2270 params->sched_scan_plans_num = src->sched_scan_plans_num;
2271 }
2272
2273 if (src->mac_addr_rand) {
2274 params->mac_addr_rand = src->mac_addr_rand;
2275
2276 if (src->mac_addr && src->mac_addr_mask) {
2277 u8 *mac_addr;
2278
2279 mac_addr = os_malloc(2 * ETH_ALEN);
2280 if (!mac_addr)
2281 goto failed;
2282
2283 os_memcpy(mac_addr, src->mac_addr, ETH_ALEN);
2284 os_memcpy(mac_addr + ETH_ALEN, src->mac_addr_mask,
2285 ETH_ALEN);
2286 params->mac_addr = mac_addr;
2287 params->mac_addr_mask = mac_addr + ETH_ALEN;
2288 }
2289 }
2290
2291 if (src->bssid) {
2292 u8 *bssid;
2293
2294 bssid = os_malloc(ETH_ALEN);
2295 if (!bssid)
2296 goto failed;
2297 os_memcpy(bssid, src->bssid, ETH_ALEN);
2298 params->bssid = bssid;
2299 }
2300
2301 return params;
2302
2303 failed:
2304 wpa_scan_free_params(params);
2305 return NULL;
2306 }
2307
2308
wpa_scan_free_params(struct wpa_driver_scan_params * params)2309 void wpa_scan_free_params(struct wpa_driver_scan_params *params)
2310 {
2311 size_t i;
2312
2313 if (params == NULL)
2314 return;
2315
2316 for (i = 0; i < params->num_ssids; i++)
2317 os_free((u8 *) params->ssids[i].ssid);
2318 os_free((u8 *) params->extra_ies);
2319 os_free(params->freqs);
2320 os_free(params->filter_ssids);
2321 os_free(params->sched_scan_plans);
2322
2323 /*
2324 * Note: params->mac_addr_mask points to same memory allocation and
2325 * must not be freed separately.
2326 */
2327 os_free((u8 *) params->mac_addr);
2328
2329 os_free((u8 *) params->bssid);
2330
2331 os_free(params);
2332 }
2333
2334
wpas_start_pno(struct wpa_supplicant * wpa_s)2335 int wpas_start_pno(struct wpa_supplicant *wpa_s)
2336 {
2337 int ret, prio;
2338 size_t i, num_ssid, num_match_ssid;
2339 struct wpa_ssid *ssid;
2340 struct wpa_driver_scan_params params;
2341 struct sched_scan_plan scan_plan;
2342 unsigned int max_sched_scan_ssids;
2343
2344 if (!wpa_s->sched_scan_supported)
2345 return -1;
2346
2347 if (wpa_s->max_sched_scan_ssids > WPAS_MAX_SCAN_SSIDS)
2348 max_sched_scan_ssids = WPAS_MAX_SCAN_SSIDS;
2349 else
2350 max_sched_scan_ssids = wpa_s->max_sched_scan_ssids;
2351 if (max_sched_scan_ssids < 1)
2352 return -1;
2353
2354 if (wpa_s->pno || wpa_s->pno_sched_pending)
2355 return 0;
2356
2357 if ((wpa_s->wpa_state > WPA_SCANNING) &&
2358 (wpa_s->wpa_state <= WPA_COMPLETED)) {
2359 wpa_printf(MSG_ERROR, "PNO: In assoc process");
2360 return -EAGAIN;
2361 }
2362
2363 if (wpa_s->wpa_state == WPA_SCANNING) {
2364 wpa_supplicant_cancel_scan(wpa_s);
2365 if (wpa_s->sched_scanning) {
2366 wpa_printf(MSG_DEBUG, "Schedule PNO on completion of "
2367 "ongoing sched scan");
2368 wpa_supplicant_cancel_sched_scan(wpa_s);
2369 wpa_s->pno_sched_pending = 1;
2370 return 0;
2371 }
2372 }
2373
2374 os_memset(¶ms, 0, sizeof(params));
2375
2376 num_ssid = num_match_ssid = 0;
2377 ssid = wpa_s->conf->ssid;
2378 while (ssid) {
2379 if (!wpas_network_disabled(wpa_s, ssid)) {
2380 num_match_ssid++;
2381 if (ssid->scan_ssid)
2382 num_ssid++;
2383 }
2384 ssid = ssid->next;
2385 }
2386
2387 if (num_match_ssid == 0) {
2388 wpa_printf(MSG_DEBUG, "PNO: No configured SSIDs");
2389 return -1;
2390 }
2391
2392 if (num_match_ssid > num_ssid) {
2393 params.num_ssids++; /* wildcard */
2394 num_ssid++;
2395 }
2396
2397 if (num_ssid > max_sched_scan_ssids) {
2398 wpa_printf(MSG_DEBUG, "PNO: Use only the first %u SSIDs from "
2399 "%u", max_sched_scan_ssids, (unsigned int) num_ssid);
2400 num_ssid = max_sched_scan_ssids;
2401 }
2402
2403 if (num_match_ssid > wpa_s->max_match_sets) {
2404 num_match_ssid = wpa_s->max_match_sets;
2405 wpa_dbg(wpa_s, MSG_DEBUG, "PNO: Too many SSIDs to match");
2406 }
2407 params.filter_ssids = os_calloc(num_match_ssid,
2408 sizeof(struct wpa_driver_scan_filter));
2409 if (params.filter_ssids == NULL)
2410 return -1;
2411
2412 i = 0;
2413 prio = 0;
2414 ssid = wpa_s->conf->pssid[prio];
2415 while (ssid) {
2416 if (!wpas_network_disabled(wpa_s, ssid)) {
2417 if (ssid->scan_ssid && params.num_ssids < num_ssid) {
2418 params.ssids[params.num_ssids].ssid =
2419 ssid->ssid;
2420 params.ssids[params.num_ssids].ssid_len =
2421 ssid->ssid_len;
2422 params.num_ssids++;
2423 }
2424 os_memcpy(params.filter_ssids[i].ssid, ssid->ssid,
2425 ssid->ssid_len);
2426 params.filter_ssids[i].ssid_len = ssid->ssid_len;
2427 params.num_filter_ssids++;
2428 i++;
2429 if (i == num_match_ssid)
2430 break;
2431 }
2432 if (ssid->pnext)
2433 ssid = ssid->pnext;
2434 else if (prio + 1 == wpa_s->conf->num_prio)
2435 break;
2436 else
2437 ssid = wpa_s->conf->pssid[++prio];
2438 }
2439
2440 if (wpa_s->conf->filter_rssi)
2441 params.filter_rssi = wpa_s->conf->filter_rssi;
2442
2443 if (wpa_s->sched_scan_plans_num) {
2444 params.sched_scan_plans = wpa_s->sched_scan_plans;
2445 params.sched_scan_plans_num = wpa_s->sched_scan_plans_num;
2446 } else {
2447 /* Set one scan plan that will run infinitely */
2448 if (wpa_s->conf->sched_scan_interval)
2449 scan_plan.interval = wpa_s->conf->sched_scan_interval;
2450 else
2451 scan_plan.interval = 10;
2452
2453 scan_plan.iterations = 0;
2454 params.sched_scan_plans = &scan_plan;
2455 params.sched_scan_plans_num = 1;
2456 }
2457
2458 if (params.freqs == NULL && wpa_s->manual_sched_scan_freqs) {
2459 wpa_dbg(wpa_s, MSG_DEBUG, "Limit sched scan to specified channels");
2460 params.freqs = wpa_s->manual_sched_scan_freqs;
2461 }
2462
2463 if (wpa_s->mac_addr_rand_enable & MAC_ADDR_RAND_PNO) {
2464 params.mac_addr_rand = 1;
2465 if (wpa_s->mac_addr_pno) {
2466 params.mac_addr = wpa_s->mac_addr_pno;
2467 params.mac_addr_mask = wpa_s->mac_addr_pno + ETH_ALEN;
2468 }
2469 }
2470
2471 ret = wpa_supplicant_start_sched_scan(wpa_s, ¶ms);
2472 os_free(params.filter_ssids);
2473 if (ret == 0)
2474 wpa_s->pno = 1;
2475 else
2476 wpa_msg(wpa_s, MSG_ERROR, "Failed to schedule PNO");
2477 return ret;
2478 }
2479
2480
wpas_stop_pno(struct wpa_supplicant * wpa_s)2481 int wpas_stop_pno(struct wpa_supplicant *wpa_s)
2482 {
2483 int ret = 0;
2484
2485 if (!wpa_s->pno)
2486 return 0;
2487
2488 ret = wpa_supplicant_stop_sched_scan(wpa_s);
2489
2490 wpa_s->pno = 0;
2491 wpa_s->pno_sched_pending = 0;
2492
2493 if (wpa_s->wpa_state == WPA_SCANNING)
2494 wpa_supplicant_req_scan(wpa_s, 0, 0);
2495
2496 return ret;
2497 }
2498
2499
wpas_mac_addr_rand_scan_clear(struct wpa_supplicant * wpa_s,unsigned int type)2500 void wpas_mac_addr_rand_scan_clear(struct wpa_supplicant *wpa_s,
2501 unsigned int type)
2502 {
2503 type &= MAC_ADDR_RAND_ALL;
2504 wpa_s->mac_addr_rand_enable &= ~type;
2505
2506 if (type & MAC_ADDR_RAND_SCAN) {
2507 os_free(wpa_s->mac_addr_scan);
2508 wpa_s->mac_addr_scan = NULL;
2509 }
2510
2511 if (type & MAC_ADDR_RAND_SCHED_SCAN) {
2512 os_free(wpa_s->mac_addr_sched_scan);
2513 wpa_s->mac_addr_sched_scan = NULL;
2514 }
2515
2516 if (type & MAC_ADDR_RAND_PNO) {
2517 os_free(wpa_s->mac_addr_pno);
2518 wpa_s->mac_addr_pno = NULL;
2519 }
2520 }
2521
2522
wpas_mac_addr_rand_scan_set(struct wpa_supplicant * wpa_s,unsigned int type,const u8 * addr,const u8 * mask)2523 int wpas_mac_addr_rand_scan_set(struct wpa_supplicant *wpa_s,
2524 unsigned int type, const u8 *addr,
2525 const u8 *mask)
2526 {
2527 u8 *tmp = NULL;
2528
2529 wpas_mac_addr_rand_scan_clear(wpa_s, type);
2530
2531 if (addr) {
2532 tmp = os_malloc(2 * ETH_ALEN);
2533 if (!tmp)
2534 return -1;
2535 os_memcpy(tmp, addr, ETH_ALEN);
2536 os_memcpy(tmp + ETH_ALEN, mask, ETH_ALEN);
2537 }
2538
2539 if (type == MAC_ADDR_RAND_SCAN) {
2540 wpa_s->mac_addr_scan = tmp;
2541 } else if (type == MAC_ADDR_RAND_SCHED_SCAN) {
2542 wpa_s->mac_addr_sched_scan = tmp;
2543 } else if (type == MAC_ADDR_RAND_PNO) {
2544 wpa_s->mac_addr_pno = tmp;
2545 } else {
2546 wpa_printf(MSG_INFO,
2547 "scan: Invalid MAC randomization type=0x%x",
2548 type);
2549 os_free(tmp);
2550 return -1;
2551 }
2552
2553 wpa_s->mac_addr_rand_enable |= type;
2554 return 0;
2555 }
2556
2557
wpas_abort_ongoing_scan(struct wpa_supplicant * wpa_s)2558 int wpas_abort_ongoing_scan(struct wpa_supplicant *wpa_s)
2559 {
2560 int scan_work = !!wpa_s->scan_work;
2561
2562 #ifdef CONFIG_P2P
2563 scan_work |= !!wpa_s->p2p_scan_work;
2564 #endif /* CONFIG_P2P */
2565
2566 if (scan_work && wpa_s->own_scan_running) {
2567 wpa_dbg(wpa_s, MSG_DEBUG, "Abort an ongoing scan");
2568 return wpa_drv_abort_scan(wpa_s);
2569 }
2570
2571 return 0;
2572 }
2573
2574
wpas_sched_scan_plans_set(struct wpa_supplicant * wpa_s,const char * cmd)2575 int wpas_sched_scan_plans_set(struct wpa_supplicant *wpa_s, const char *cmd)
2576 {
2577 struct sched_scan_plan *scan_plans = NULL;
2578 const char *token, *context = NULL;
2579 unsigned int num = 0;
2580
2581 if (!cmd)
2582 return -1;
2583
2584 if (!cmd[0]) {
2585 wpa_printf(MSG_DEBUG, "Clear sched scan plans");
2586 os_free(wpa_s->sched_scan_plans);
2587 wpa_s->sched_scan_plans = NULL;
2588 wpa_s->sched_scan_plans_num = 0;
2589 return 0;
2590 }
2591
2592 while ((token = cstr_token(cmd, " ", &context))) {
2593 int ret;
2594 struct sched_scan_plan *scan_plan, *n;
2595
2596 n = os_realloc_array(scan_plans, num + 1, sizeof(*scan_plans));
2597 if (!n)
2598 goto fail;
2599
2600 scan_plans = n;
2601 scan_plan = &scan_plans[num];
2602 num++;
2603
2604 ret = sscanf(token, "%u:%u", &scan_plan->interval,
2605 &scan_plan->iterations);
2606 if (ret <= 0 || ret > 2 || !scan_plan->interval) {
2607 wpa_printf(MSG_ERROR,
2608 "Invalid sched scan plan input: %s", token);
2609 goto fail;
2610 }
2611
2612 if (!scan_plan->interval) {
2613 wpa_printf(MSG_ERROR,
2614 "scan plan %u: Interval cannot be zero",
2615 num);
2616 goto fail;
2617 }
2618
2619 if (scan_plan->interval > wpa_s->max_sched_scan_plan_interval) {
2620 wpa_printf(MSG_WARNING,
2621 "scan plan %u: Scan interval too long(%u), use the maximum allowed(%u)",
2622 num, scan_plan->interval,
2623 wpa_s->max_sched_scan_plan_interval);
2624 scan_plan->interval =
2625 wpa_s->max_sched_scan_plan_interval;
2626 }
2627
2628 if (ret == 1) {
2629 scan_plan->iterations = 0;
2630 break;
2631 }
2632
2633 if (!scan_plan->iterations) {
2634 wpa_printf(MSG_ERROR,
2635 "scan plan %u: Number of iterations cannot be zero",
2636 num);
2637 goto fail;
2638 }
2639
2640 if (scan_plan->iterations >
2641 wpa_s->max_sched_scan_plan_iterations) {
2642 wpa_printf(MSG_WARNING,
2643 "scan plan %u: Too many iterations(%u), use the maximum allowed(%u)",
2644 num, scan_plan->iterations,
2645 wpa_s->max_sched_scan_plan_iterations);
2646 scan_plan->iterations =
2647 wpa_s->max_sched_scan_plan_iterations;
2648 }
2649
2650 wpa_printf(MSG_DEBUG,
2651 "scan plan %u: interval=%u iterations=%u",
2652 num, scan_plan->interval, scan_plan->iterations);
2653 }
2654
2655 if (!scan_plans) {
2656 wpa_printf(MSG_ERROR, "Invalid scan plans entry");
2657 goto fail;
2658 }
2659
2660 if (cstr_token(cmd, " ", &context) || scan_plans[num - 1].iterations) {
2661 wpa_printf(MSG_ERROR,
2662 "All scan plans but the last must specify a number of iterations");
2663 goto fail;
2664 }
2665
2666 wpa_printf(MSG_DEBUG, "scan plan %u (last plan): interval=%u",
2667 num, scan_plans[num - 1].interval);
2668
2669 if (num > wpa_s->max_sched_scan_plans) {
2670 wpa_printf(MSG_WARNING,
2671 "Too many scheduled scan plans (only %u supported)",
2672 wpa_s->max_sched_scan_plans);
2673 wpa_printf(MSG_WARNING,
2674 "Use only the first %u scan plans, and the last one (in infinite loop)",
2675 wpa_s->max_sched_scan_plans - 1);
2676 os_memcpy(&scan_plans[wpa_s->max_sched_scan_plans - 1],
2677 &scan_plans[num - 1], sizeof(*scan_plans));
2678 num = wpa_s->max_sched_scan_plans;
2679 }
2680
2681 os_free(wpa_s->sched_scan_plans);
2682 wpa_s->sched_scan_plans = scan_plans;
2683 wpa_s->sched_scan_plans_num = num;
2684
2685 return 0;
2686
2687 fail:
2688 os_free(scan_plans);
2689 wpa_printf(MSG_ERROR, "invalid scan plans list");
2690 return -1;
2691 }
2692