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