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P2P: Do not allow scan or normal association on cfg80211 P2P Device
[thirdparty/hostap.git] / wpa_supplicant / scan.c
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
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
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 */
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
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
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 */
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
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
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
269 int wpa_supplicant_start_sched_scan(struct wpa_supplicant *wpa_s,
270 struct wpa_driver_scan_params *params,
271 int interval)
272 {
273 int ret;
274
275 wpa_supplicant_notify_scanning(wpa_s, 1);
276 ret = wpa_drv_sched_scan(wpa_s, params, interval * 1000);
277 if (ret)
278 wpa_supplicant_notify_scanning(wpa_s, 0);
279 else
280 wpa_s->sched_scanning = 1;
281
282 return ret;
283 }
284
285
286 int wpa_supplicant_stop_sched_scan(struct wpa_supplicant *wpa_s)
287 {
288 int ret;
289
290 ret = wpa_drv_stop_sched_scan(wpa_s);
291 if (ret) {
292 wpa_dbg(wpa_s, MSG_DEBUG, "stopping sched_scan failed!");
293 /* TODO: what to do if stopping fails? */
294 return -1;
295 }
296
297 return ret;
298 }
299
300
301 static struct wpa_driver_scan_filter *
302 wpa_supplicant_build_filter_ssids(struct wpa_config *conf, size_t *num_ssids)
303 {
304 struct wpa_driver_scan_filter *ssids;
305 struct wpa_ssid *ssid;
306 size_t count;
307
308 *num_ssids = 0;
309 if (!conf->filter_ssids)
310 return NULL;
311
312 for (count = 0, ssid = conf->ssid; ssid; ssid = ssid->next) {
313 if (ssid->ssid && ssid->ssid_len)
314 count++;
315 }
316 if (count == 0)
317 return NULL;
318 ssids = os_calloc(count, sizeof(struct wpa_driver_scan_filter));
319 if (ssids == NULL)
320 return NULL;
321
322 for (ssid = conf->ssid; ssid; ssid = ssid->next) {
323 if (!ssid->ssid || !ssid->ssid_len)
324 continue;
325 os_memcpy(ssids[*num_ssids].ssid, ssid->ssid, ssid->ssid_len);
326 ssids[*num_ssids].ssid_len = ssid->ssid_len;
327 (*num_ssids)++;
328 }
329
330 return ssids;
331 }
332
333
334 static void wpa_supplicant_optimize_freqs(
335 struct wpa_supplicant *wpa_s, struct wpa_driver_scan_params *params)
336 {
337 #ifdef CONFIG_P2P
338 if (params->freqs == NULL && wpa_s->p2p_in_provisioning &&
339 wpa_s->go_params) {
340 /* Optimize provisioning state scan based on GO information */
341 if (wpa_s->p2p_in_provisioning < 5 &&
342 wpa_s->go_params->freq > 0) {
343 wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only GO "
344 "preferred frequency %d MHz",
345 wpa_s->go_params->freq);
346 params->freqs = os_calloc(2, sizeof(int));
347 if (params->freqs)
348 params->freqs[0] = wpa_s->go_params->freq;
349 } else if (wpa_s->p2p_in_provisioning < 8 &&
350 wpa_s->go_params->freq_list[0]) {
351 wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only common "
352 "channels");
353 int_array_concat(&params->freqs,
354 wpa_s->go_params->freq_list);
355 if (params->freqs)
356 int_array_sort_unique(params->freqs);
357 }
358 wpa_s->p2p_in_provisioning++;
359 }
360
361 if (params->freqs == NULL && wpa_s->p2p_in_invitation) {
362 /*
363 * Optimize scan based on GO information during persistent
364 * group reinvocation
365 */
366 if (wpa_s->p2p_in_invitation < 5 &&
367 wpa_s->p2p_invite_go_freq > 0) {
368 wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only GO preferred frequency %d MHz during invitation",
369 wpa_s->p2p_invite_go_freq);
370 params->freqs = os_calloc(2, sizeof(int));
371 if (params->freqs)
372 params->freqs[0] = wpa_s->p2p_invite_go_freq;
373 }
374 wpa_s->p2p_in_invitation++;
375 if (wpa_s->p2p_in_invitation > 20) {
376 /*
377 * This should not really happen since the variable is
378 * cleared on group removal, but if it does happen, make
379 * sure we do not get stuck in special invitation scan
380 * mode.
381 */
382 wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Clear p2p_in_invitation");
383 wpa_s->p2p_in_invitation = 0;
384 }
385 }
386 #endif /* CONFIG_P2P */
387
388 #ifdef CONFIG_WPS
389 if (params->freqs == NULL && wpa_s->after_wps && wpa_s->wps_freq) {
390 /*
391 * Optimize post-provisioning scan based on channel used
392 * during provisioning.
393 */
394 wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Scan only frequency %u MHz "
395 "that was used during provisioning", wpa_s->wps_freq);
396 params->freqs = os_calloc(2, sizeof(int));
397 if (params->freqs)
398 params->freqs[0] = wpa_s->wps_freq;
399 wpa_s->after_wps--;
400 } else if (wpa_s->after_wps)
401 wpa_s->after_wps--;
402
403 if (params->freqs == NULL && wpa_s->known_wps_freq && wpa_s->wps_freq)
404 {
405 /* Optimize provisioning scan based on already known channel */
406 wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Scan only frequency %u MHz",
407 wpa_s->wps_freq);
408 params->freqs = os_calloc(2, sizeof(int));
409 if (params->freqs)
410 params->freqs[0] = wpa_s->wps_freq;
411 wpa_s->known_wps_freq = 0; /* only do this once */
412 }
413 #endif /* CONFIG_WPS */
414 }
415
416
417 #ifdef CONFIG_INTERWORKING
418 static void wpas_add_interworking_elements(struct wpa_supplicant *wpa_s,
419 struct wpabuf *buf)
420 {
421 if (wpa_s->conf->interworking == 0)
422 return;
423
424 wpabuf_put_u8(buf, WLAN_EID_EXT_CAPAB);
425 wpabuf_put_u8(buf, 6);
426 wpabuf_put_u8(buf, 0x00);
427 wpabuf_put_u8(buf, 0x00);
428 wpabuf_put_u8(buf, 0x00);
429 wpabuf_put_u8(buf, 0x80); /* Bit 31 - Interworking */
430 wpabuf_put_u8(buf, 0x00);
431 #ifdef CONFIG_HS20
432 wpabuf_put_u8(buf, 0x40); /* Bit 46 - WNM-Notification */
433 #else /* CONFIG_HS20 */
434 wpabuf_put_u8(buf, 0x00);
435 #endif /* CONFIG_HS20 */
436
437 wpabuf_put_u8(buf, WLAN_EID_INTERWORKING);
438 wpabuf_put_u8(buf, is_zero_ether_addr(wpa_s->conf->hessid) ? 1 :
439 1 + ETH_ALEN);
440 wpabuf_put_u8(buf, wpa_s->conf->access_network_type);
441 /* No Venue Info */
442 if (!is_zero_ether_addr(wpa_s->conf->hessid))
443 wpabuf_put_data(buf, wpa_s->conf->hessid, ETH_ALEN);
444 }
445 #endif /* CONFIG_INTERWORKING */
446
447
448 static struct wpabuf * wpa_supplicant_extra_ies(struct wpa_supplicant *wpa_s)
449 {
450 struct wpabuf *extra_ie = NULL;
451 #ifdef CONFIG_WPS
452 int wps = 0;
453 enum wps_request_type req_type = WPS_REQ_ENROLLEE_INFO;
454 #endif /* CONFIG_WPS */
455
456 #ifdef CONFIG_INTERWORKING
457 if (wpa_s->conf->interworking &&
458 wpabuf_resize(&extra_ie, 100) == 0)
459 wpas_add_interworking_elements(wpa_s, extra_ie);
460 #endif /* CONFIG_INTERWORKING */
461
462 #ifdef CONFIG_WPS
463 wps = wpas_wps_in_use(wpa_s, &req_type);
464
465 if (wps) {
466 struct wpabuf *wps_ie;
467 wps_ie = wps_build_probe_req_ie(wps == 2 ? DEV_PW_PUSHBUTTON :
468 DEV_PW_DEFAULT,
469 &wpa_s->wps->dev,
470 wpa_s->wps->uuid, req_type,
471 0, NULL);
472 if (wps_ie) {
473 if (wpabuf_resize(&extra_ie, wpabuf_len(wps_ie)) == 0)
474 wpabuf_put_buf(extra_ie, wps_ie);
475 wpabuf_free(wps_ie);
476 }
477 }
478
479 #ifdef CONFIG_P2P
480 if (wps) {
481 size_t ielen = p2p_scan_ie_buf_len(wpa_s->global->p2p);
482 if (wpabuf_resize(&extra_ie, ielen) == 0)
483 wpas_p2p_scan_ie(wpa_s, extra_ie);
484 }
485 #endif /* CONFIG_P2P */
486
487 wpa_supplicant_mesh_add_scan_ie(wpa_s, &extra_ie);
488
489 #endif /* CONFIG_WPS */
490
491 #ifdef CONFIG_HS20
492 if (wpa_s->conf->hs20 && wpabuf_resize(&extra_ie, 7) == 0)
493 wpas_hs20_add_indication(extra_ie, -1);
494 #endif /* CONFIG_HS20 */
495
496 return extra_ie;
497 }
498
499
500 #ifdef CONFIG_P2P
501
502 /*
503 * Check whether there are any enabled networks or credentials that could be
504 * used for a non-P2P connection.
505 */
506 static int non_p2p_network_enabled(struct wpa_supplicant *wpa_s)
507 {
508 struct wpa_ssid *ssid;
509
510 for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
511 if (wpas_network_disabled(wpa_s, ssid))
512 continue;
513 if (!ssid->p2p_group)
514 return 1;
515 }
516
517 if (wpa_s->conf->cred && wpa_s->conf->interworking &&
518 wpa_s->conf->auto_interworking)
519 return 1;
520
521 return 0;
522 }
523
524 #endif /* CONFIG_P2P */
525
526
527 static struct hostapd_hw_modes * get_mode(struct hostapd_hw_modes *modes,
528 u16 num_modes,
529 enum hostapd_hw_mode mode)
530 {
531 u16 i;
532
533 for (i = 0; i < num_modes; i++) {
534 if (modes[i].mode == mode)
535 return &modes[i];
536 }
537
538 return NULL;
539 }
540
541
542 static void wpa_setband_scan_freqs_list(struct wpa_supplicant *wpa_s,
543 enum hostapd_hw_mode band,
544 struct wpa_driver_scan_params *params)
545 {
546 /* Include only supported channels for the specified band */
547 struct hostapd_hw_modes *mode;
548 int count, i;
549
550 mode = get_mode(wpa_s->hw.modes, wpa_s->hw.num_modes, band);
551 if (mode == NULL) {
552 /* No channels supported in this band - use empty list */
553 params->freqs = os_zalloc(sizeof(int));
554 return;
555 }
556
557 params->freqs = os_calloc(mode->num_channels + 1, sizeof(int));
558 if (params->freqs == NULL)
559 return;
560 for (count = 0, i = 0; i < mode->num_channels; i++) {
561 if (mode->channels[i].flag & HOSTAPD_CHAN_DISABLED)
562 continue;
563 params->freqs[count++] = mode->channels[i].freq;
564 }
565 }
566
567
568 static void wpa_setband_scan_freqs(struct wpa_supplicant *wpa_s,
569 struct wpa_driver_scan_params *params)
570 {
571 if (wpa_s->hw.modes == NULL)
572 return; /* unknown what channels the driver supports */
573 if (params->freqs)
574 return; /* already using a limited channel set */
575 if (wpa_s->setband == WPA_SETBAND_5G)
576 wpa_setband_scan_freqs_list(wpa_s, HOSTAPD_MODE_IEEE80211A,
577 params);
578 else if (wpa_s->setband == WPA_SETBAND_2G)
579 wpa_setband_scan_freqs_list(wpa_s, HOSTAPD_MODE_IEEE80211G,
580 params);
581 }
582
583
584 static void wpa_set_scan_ssids(struct wpa_supplicant *wpa_s,
585 struct wpa_driver_scan_params *params,
586 size_t max_ssids)
587 {
588 unsigned int i;
589 struct wpa_ssid *ssid;
590
591 for (i = 0; i < wpa_s->scan_id_count; i++) {
592 unsigned int j;
593
594 ssid = wpa_config_get_network(wpa_s->conf, wpa_s->scan_id[i]);
595 if (!ssid || !ssid->scan_ssid)
596 continue;
597
598 for (j = 0; j < params->num_ssids; j++) {
599 if (params->ssids[j].ssid_len == ssid->ssid_len &&
600 params->ssids[j].ssid &&
601 os_memcmp(params->ssids[j].ssid, ssid->ssid,
602 ssid->ssid_len) == 0)
603 break;
604 }
605 if (j < params->num_ssids)
606 continue; /* already in the list */
607
608 if (params->num_ssids + 1 > max_ssids) {
609 wpa_printf(MSG_DEBUG,
610 "Over max scan SSIDs for manual request");
611 break;
612 }
613
614 wpa_printf(MSG_DEBUG, "Scan SSID (manual request): %s",
615 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
616 params->ssids[params->num_ssids].ssid = ssid->ssid;
617 params->ssids[params->num_ssids].ssid_len = ssid->ssid_len;
618 params->num_ssids++;
619 }
620
621 wpa_s->scan_id_count = 0;
622 }
623
624
625 static void wpa_supplicant_scan(void *eloop_ctx, void *timeout_ctx)
626 {
627 struct wpa_supplicant *wpa_s = eloop_ctx;
628 struct wpa_ssid *ssid;
629 int ret, p2p_in_prog;
630 struct wpabuf *extra_ie = NULL;
631 struct wpa_driver_scan_params params;
632 struct wpa_driver_scan_params *scan_params;
633 size_t max_ssids;
634
635 if (wpa_s->pno || wpa_s->pno_sched_pending) {
636 wpa_dbg(wpa_s, MSG_DEBUG, "Skip scan - PNO is in progress");
637 return;
638 }
639
640 if (wpa_s->wpa_state == WPA_INTERFACE_DISABLED) {
641 wpa_dbg(wpa_s, MSG_DEBUG, "Skip scan - interface disabled");
642 return;
643 }
644
645 if (wpa_s->disconnected && wpa_s->scan_req == NORMAL_SCAN_REQ) {
646 wpa_dbg(wpa_s, MSG_DEBUG, "Disconnected - do not scan");
647 wpa_supplicant_set_state(wpa_s, WPA_DISCONNECTED);
648 return;
649 }
650
651 if (wpa_s->scanning) {
652 /*
653 * If we are already in scanning state, we shall reschedule the
654 * the incoming scan request.
655 */
656 wpa_dbg(wpa_s, MSG_DEBUG, "Already scanning - Reschedule the incoming scan req");
657 wpa_supplicant_req_scan(wpa_s, 1, 0);
658 return;
659 }
660
661 if (!wpa_supplicant_enabled_networks(wpa_s) &&
662 wpa_s->scan_req == NORMAL_SCAN_REQ) {
663 wpa_dbg(wpa_s, MSG_DEBUG, "No enabled networks - do not scan");
664 wpa_supplicant_set_state(wpa_s, WPA_INACTIVE);
665 return;
666 }
667
668 if (wpa_s->conf->ap_scan != 0 &&
669 (wpa_s->drv_flags & WPA_DRIVER_FLAGS_WIRED)) {
670 wpa_dbg(wpa_s, MSG_DEBUG, "Using wired authentication - "
671 "overriding ap_scan configuration");
672 wpa_s->conf->ap_scan = 0;
673 wpas_notify_ap_scan_changed(wpa_s);
674 }
675
676 if (wpa_s->conf->ap_scan == 0) {
677 wpa_supplicant_gen_assoc_event(wpa_s);
678 return;
679 }
680
681 p2p_in_prog = wpas_p2p_in_progress(wpa_s);
682 if (p2p_in_prog && p2p_in_prog != 2) {
683 wpa_dbg(wpa_s, MSG_DEBUG, "Delay station mode scan while P2P operation is in progress");
684 wpa_supplicant_req_scan(wpa_s, 5, 0);
685 return;
686 }
687
688 if (wpa_s->conf->ap_scan == 2)
689 max_ssids = 1;
690 else {
691 max_ssids = wpa_s->max_scan_ssids;
692 if (max_ssids > WPAS_MAX_SCAN_SSIDS)
693 max_ssids = WPAS_MAX_SCAN_SSIDS;
694 }
695
696 wpa_s->last_scan_req = wpa_s->scan_req;
697 wpa_s->scan_req = NORMAL_SCAN_REQ;
698
699 os_memset(&params, 0, sizeof(params));
700
701 wpa_s->scan_prev_wpa_state = wpa_s->wpa_state;
702 if (wpa_s->wpa_state == WPA_DISCONNECTED ||
703 wpa_s->wpa_state == WPA_INACTIVE)
704 wpa_supplicant_set_state(wpa_s, WPA_SCANNING);
705
706 /*
707 * If autoscan has set its own scanning parameters
708 */
709 if (wpa_s->autoscan_params != NULL) {
710 scan_params = wpa_s->autoscan_params;
711 goto scan;
712 }
713
714 if (wpa_s->last_scan_req != MANUAL_SCAN_REQ &&
715 wpa_s->connect_without_scan) {
716 for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
717 if (ssid == wpa_s->connect_without_scan)
718 break;
719 }
720 wpa_s->connect_without_scan = NULL;
721 if (ssid) {
722 wpa_printf(MSG_DEBUG, "Start a pre-selected network "
723 "without scan step");
724 wpa_supplicant_associate(wpa_s, NULL, ssid);
725 return;
726 }
727 }
728
729 #ifdef CONFIG_P2P
730 if ((wpa_s->p2p_in_provisioning || wpa_s->show_group_started) &&
731 wpa_s->go_params && !wpa_s->conf->passive_scan) {
732 wpa_printf(MSG_DEBUG, "P2P: Use specific SSID for scan during P2P group formation (p2p_in_provisioning=%d show_group_started=%d)",
733 wpa_s->p2p_in_provisioning,
734 wpa_s->show_group_started);
735 params.ssids[0].ssid = wpa_s->go_params->ssid;
736 params.ssids[0].ssid_len = wpa_s->go_params->ssid_len;
737 params.num_ssids = 1;
738 goto ssid_list_set;
739 }
740
741 if (wpa_s->p2p_in_invitation) {
742 if (wpa_s->current_ssid) {
743 wpa_printf(MSG_DEBUG, "P2P: Use specific SSID for scan during invitation");
744 params.ssids[0].ssid = wpa_s->current_ssid->ssid;
745 params.ssids[0].ssid_len =
746 wpa_s->current_ssid->ssid_len;
747 params.num_ssids = 1;
748 } else {
749 wpa_printf(MSG_DEBUG, "P2P: No specific SSID known for scan during invitation");
750 }
751 goto ssid_list_set;
752 }
753 #endif /* CONFIG_P2P */
754
755 /* Find the starting point from which to continue scanning */
756 ssid = wpa_s->conf->ssid;
757 if (wpa_s->prev_scan_ssid != WILDCARD_SSID_SCAN) {
758 while (ssid) {
759 if (ssid == wpa_s->prev_scan_ssid) {
760 ssid = ssid->next;
761 break;
762 }
763 ssid = ssid->next;
764 }
765 }
766
767 if (wpa_s->last_scan_req != MANUAL_SCAN_REQ &&
768 wpa_s->conf->ap_scan == 2) {
769 wpa_s->connect_without_scan = NULL;
770 wpa_s->prev_scan_wildcard = 0;
771 wpa_supplicant_assoc_try(wpa_s, ssid);
772 return;
773 } else if (wpa_s->conf->ap_scan == 2) {
774 /*
775 * User-initiated scan request in ap_scan == 2; scan with
776 * wildcard SSID.
777 */
778 ssid = NULL;
779 } else if (wpa_s->reattach && wpa_s->current_ssid != NULL) {
780 /*
781 * Perform single-channel single-SSID scan for
782 * reassociate-to-same-BSS operation.
783 */
784 /* Setup SSID */
785 ssid = wpa_s->current_ssid;
786 wpa_hexdump_ascii(MSG_DEBUG, "Scan SSID",
787 ssid->ssid, ssid->ssid_len);
788 params.ssids[0].ssid = ssid->ssid;
789 params.ssids[0].ssid_len = ssid->ssid_len;
790 params.num_ssids = 1;
791
792 /*
793 * Allocate memory for frequency array, allocate one extra
794 * slot for the zero-terminator.
795 */
796 params.freqs = os_malloc(sizeof(int) * 2);
797 if (params.freqs == NULL) {
798 wpa_dbg(wpa_s, MSG_ERROR, "Memory allocation failed");
799 return;
800 }
801 params.freqs[0] = wpa_s->assoc_freq;
802 params.freqs[1] = 0;
803
804 /*
805 * Reset the reattach flag so that we fall back to full scan if
806 * this scan fails.
807 */
808 wpa_s->reattach = 0;
809 } else {
810 struct wpa_ssid *start = ssid, *tssid;
811 int freqs_set = 0;
812 if (ssid == NULL && max_ssids > 1)
813 ssid = wpa_s->conf->ssid;
814 while (ssid) {
815 if (!wpas_network_disabled(wpa_s, ssid) &&
816 ssid->scan_ssid) {
817 wpa_hexdump_ascii(MSG_DEBUG, "Scan SSID",
818 ssid->ssid, ssid->ssid_len);
819 params.ssids[params.num_ssids].ssid =
820 ssid->ssid;
821 params.ssids[params.num_ssids].ssid_len =
822 ssid->ssid_len;
823 params.num_ssids++;
824 if (params.num_ssids + 1 >= max_ssids)
825 break;
826 }
827 ssid = ssid->next;
828 if (ssid == start)
829 break;
830 if (ssid == NULL && max_ssids > 1 &&
831 start != wpa_s->conf->ssid)
832 ssid = wpa_s->conf->ssid;
833 }
834
835 if (wpa_s->scan_id_count &&
836 wpa_s->last_scan_req == MANUAL_SCAN_REQ)
837 wpa_set_scan_ssids(wpa_s, &params, max_ssids);
838
839 for (tssid = wpa_s->conf->ssid;
840 wpa_s->last_scan_req != MANUAL_SCAN_REQ && tssid;
841 tssid = tssid->next) {
842 if (wpas_network_disabled(wpa_s, tssid))
843 continue;
844 if ((params.freqs || !freqs_set) && tssid->scan_freq) {
845 int_array_concat(&params.freqs,
846 tssid->scan_freq);
847 } else {
848 os_free(params.freqs);
849 params.freqs = NULL;
850 }
851 freqs_set = 1;
852 }
853 int_array_sort_unique(params.freqs);
854 }
855
856 if (ssid && max_ssids == 1) {
857 /*
858 * If the driver is limited to 1 SSID at a time interleave
859 * wildcard SSID scans with specific SSID scans to avoid
860 * waiting a long time for a wildcard scan.
861 */
862 if (!wpa_s->prev_scan_wildcard) {
863 params.ssids[0].ssid = NULL;
864 params.ssids[0].ssid_len = 0;
865 wpa_s->prev_scan_wildcard = 1;
866 wpa_dbg(wpa_s, MSG_DEBUG, "Starting AP scan for "
867 "wildcard SSID (Interleave with specific)");
868 } else {
869 wpa_s->prev_scan_ssid = ssid;
870 wpa_s->prev_scan_wildcard = 0;
871 wpa_dbg(wpa_s, MSG_DEBUG,
872 "Starting AP scan for specific SSID: %s",
873 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
874 }
875 } else if (ssid) {
876 /* max_ssids > 1 */
877
878 wpa_s->prev_scan_ssid = ssid;
879 wpa_dbg(wpa_s, MSG_DEBUG, "Include wildcard SSID in "
880 "the scan request");
881 params.num_ssids++;
882 } else if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
883 wpa_s->manual_scan_passive && params.num_ssids == 0) {
884 wpa_dbg(wpa_s, MSG_DEBUG, "Use passive scan based on manual request");
885 } else if (wpa_s->conf->passive_scan) {
886 wpa_dbg(wpa_s, MSG_DEBUG,
887 "Use passive scan based on configuration");
888 } else {
889 wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
890 params.num_ssids++;
891 wpa_dbg(wpa_s, MSG_DEBUG, "Starting AP scan for wildcard "
892 "SSID");
893 }
894 #ifdef CONFIG_P2P
895 ssid_list_set:
896 #endif /* CONFIG_P2P */
897
898 wpa_supplicant_optimize_freqs(wpa_s, &params);
899 extra_ie = wpa_supplicant_extra_ies(wpa_s);
900
901 if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
902 wpa_s->manual_scan_only_new) {
903 wpa_printf(MSG_DEBUG,
904 "Request driver to clear scan cache due to manual only_new=1 scan");
905 params.only_new_results = 1;
906 }
907
908 if (wpa_s->last_scan_req == MANUAL_SCAN_REQ && params.freqs == NULL &&
909 wpa_s->manual_scan_freqs) {
910 wpa_dbg(wpa_s, MSG_DEBUG, "Limit manual scan to specified channels");
911 params.freqs = wpa_s->manual_scan_freqs;
912 wpa_s->manual_scan_freqs = NULL;
913 }
914
915 if (params.freqs == NULL && wpa_s->next_scan_freqs) {
916 wpa_dbg(wpa_s, MSG_DEBUG, "Optimize scan based on previously "
917 "generated frequency list");
918 params.freqs = wpa_s->next_scan_freqs;
919 } else
920 os_free(wpa_s->next_scan_freqs);
921 wpa_s->next_scan_freqs = NULL;
922 wpa_setband_scan_freqs(wpa_s, &params);
923
924 /* See if user specified frequencies. If so, scan only those. */
925 if (wpa_s->conf->freq_list && !params.freqs) {
926 wpa_dbg(wpa_s, MSG_DEBUG,
927 "Optimize scan based on conf->freq_list");
928 int_array_concat(&params.freqs, wpa_s->conf->freq_list);
929 }
930
931 /* Use current associated channel? */
932 if (wpa_s->conf->scan_cur_freq && !params.freqs) {
933 unsigned int num = wpa_s->num_multichan_concurrent;
934
935 params.freqs = os_calloc(num + 1, sizeof(int));
936 if (params.freqs) {
937 num = get_shared_radio_freqs(wpa_s, params.freqs, num);
938 if (num > 0) {
939 wpa_dbg(wpa_s, MSG_DEBUG, "Scan only the "
940 "current operating channels since "
941 "scan_cur_freq is enabled");
942 } else {
943 os_free(params.freqs);
944 params.freqs = NULL;
945 }
946 }
947 }
948
949 params.filter_ssids = wpa_supplicant_build_filter_ssids(
950 wpa_s->conf, &params.num_filter_ssids);
951 if (extra_ie) {
952 params.extra_ies = wpabuf_head(extra_ie);
953 params.extra_ies_len = wpabuf_len(extra_ie);
954 }
955
956 #ifdef CONFIG_P2P
957 if (wpa_s->p2p_in_provisioning || wpa_s->p2p_in_invitation ||
958 (wpa_s->show_group_started && wpa_s->go_params)) {
959 /*
960 * The interface may not yet be in P2P mode, so we have to
961 * explicitly request P2P probe to disable CCK rates.
962 */
963 params.p2p_probe = 1;
964 }
965 #endif /* CONFIG_P2P */
966
967 if (wpa_s->mac_addr_rand_enable & MAC_ADDR_RAND_SCAN) {
968 params.mac_addr_rand = 1;
969 if (wpa_s->mac_addr_scan) {
970 params.mac_addr = wpa_s->mac_addr_scan;
971 params.mac_addr_mask = wpa_s->mac_addr_scan + ETH_ALEN;
972 }
973 }
974
975 scan_params = &params;
976
977 scan:
978 #ifdef CONFIG_P2P
979 /*
980 * If the driver does not support multi-channel concurrency and a
981 * virtual interface that shares the same radio with the wpa_s interface
982 * is operating there may not be need to scan other channels apart from
983 * the current operating channel on the other virtual interface. Filter
984 * out other channels in case we are trying to find a connection for a
985 * station interface when we are not configured to prefer station
986 * connection and a concurrent operation is already in process.
987 */
988 if (wpa_s->scan_for_connection &&
989 wpa_s->last_scan_req == NORMAL_SCAN_REQ &&
990 !scan_params->freqs && !params.freqs &&
991 wpas_is_p2p_prioritized(wpa_s) &&
992 wpa_s->p2p_group_interface == NOT_P2P_GROUP_INTERFACE &&
993 non_p2p_network_enabled(wpa_s)) {
994 unsigned int num = wpa_s->num_multichan_concurrent;
995
996 params.freqs = os_calloc(num + 1, sizeof(int));
997 if (params.freqs) {
998 num = get_shared_radio_freqs(wpa_s, params.freqs, num);
999 if (num > 0 && num == wpa_s->num_multichan_concurrent) {
1000 wpa_dbg(wpa_s, MSG_DEBUG, "Scan only the current operating channels since all channels are already used");
1001 } else {
1002 os_free(params.freqs);
1003 params.freqs = NULL;
1004 }
1005 }
1006 }
1007 #endif /* CONFIG_P2P */
1008
1009 ret = wpa_supplicant_trigger_scan(wpa_s, scan_params);
1010
1011 if (ret && wpa_s->last_scan_req == MANUAL_SCAN_REQ && params.freqs &&
1012 !wpa_s->manual_scan_freqs) {
1013 /* Restore manual_scan_freqs for the next attempt */
1014 wpa_s->manual_scan_freqs = params.freqs;
1015 params.freqs = NULL;
1016 }
1017
1018 wpabuf_free(extra_ie);
1019 os_free(params.freqs);
1020 os_free(params.filter_ssids);
1021
1022 if (ret) {
1023 wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate AP scan");
1024 if (wpa_s->scan_prev_wpa_state != wpa_s->wpa_state)
1025 wpa_supplicant_set_state(wpa_s,
1026 wpa_s->scan_prev_wpa_state);
1027 /* Restore scan_req since we will try to scan again */
1028 wpa_s->scan_req = wpa_s->last_scan_req;
1029 wpa_supplicant_req_scan(wpa_s, 1, 0);
1030 } else {
1031 wpa_s->scan_for_connection = 0;
1032 #ifdef CONFIG_INTERWORKING
1033 wpa_s->interworking_fast_assoc_tried = 0;
1034 #endif /* CONFIG_INTERWORKING */
1035 }
1036 }
1037
1038
1039 void wpa_supplicant_update_scan_int(struct wpa_supplicant *wpa_s, int sec)
1040 {
1041 struct os_reltime remaining, new_int;
1042 int cancelled;
1043
1044 cancelled = eloop_cancel_timeout_one(wpa_supplicant_scan, wpa_s, NULL,
1045 &remaining);
1046
1047 new_int.sec = sec;
1048 new_int.usec = 0;
1049 if (cancelled && os_reltime_before(&remaining, &new_int)) {
1050 new_int.sec = remaining.sec;
1051 new_int.usec = remaining.usec;
1052 }
1053
1054 if (cancelled) {
1055 eloop_register_timeout(new_int.sec, new_int.usec,
1056 wpa_supplicant_scan, wpa_s, NULL);
1057 }
1058 wpa_s->scan_interval = sec;
1059 }
1060
1061
1062 /**
1063 * wpa_supplicant_req_scan - Schedule a scan for neighboring access points
1064 * @wpa_s: Pointer to wpa_supplicant data
1065 * @sec: Number of seconds after which to scan
1066 * @usec: Number of microseconds after which to scan
1067 *
1068 * This function is used to schedule a scan for neighboring access points after
1069 * the specified time.
1070 */
1071 void wpa_supplicant_req_scan(struct wpa_supplicant *wpa_s, int sec, int usec)
1072 {
1073 int res;
1074
1075 if (wpa_s->p2p_mgmt) {
1076 wpa_dbg(wpa_s, MSG_DEBUG,
1077 "Ignore scan request (%d.%06d sec) on p2p_mgmt interface",
1078 sec, usec);
1079 return;
1080 }
1081
1082 res = eloop_deplete_timeout(sec, usec, wpa_supplicant_scan, wpa_s,
1083 NULL);
1084 if (res == 1) {
1085 wpa_dbg(wpa_s, MSG_DEBUG, "Rescheduling scan request: %d.%06d sec",
1086 sec, usec);
1087 } else if (res == 0) {
1088 wpa_dbg(wpa_s, MSG_DEBUG, "Ignore new scan request for %d.%06d sec since an earlier request is scheduled to trigger sooner",
1089 sec, usec);
1090 } else {
1091 wpa_dbg(wpa_s, MSG_DEBUG, "Setting scan request: %d.%06d sec",
1092 sec, usec);
1093 eloop_register_timeout(sec, usec, wpa_supplicant_scan, wpa_s, NULL);
1094 }
1095 }
1096
1097
1098 /**
1099 * wpa_supplicant_delayed_sched_scan - Request a delayed scheduled scan
1100 * @wpa_s: Pointer to wpa_supplicant data
1101 * @sec: Number of seconds after which to scan
1102 * @usec: Number of microseconds after which to scan
1103 * Returns: 0 on success or -1 otherwise
1104 *
1105 * This function is used to schedule periodic scans for neighboring
1106 * access points after the specified time.
1107 */
1108 int wpa_supplicant_delayed_sched_scan(struct wpa_supplicant *wpa_s,
1109 int sec, int usec)
1110 {
1111 if (!wpa_s->sched_scan_supported)
1112 return -1;
1113
1114 eloop_register_timeout(sec, usec,
1115 wpa_supplicant_delayed_sched_scan_timeout,
1116 wpa_s, NULL);
1117
1118 return 0;
1119 }
1120
1121
1122 /**
1123 * wpa_supplicant_req_sched_scan - Start a periodic scheduled scan
1124 * @wpa_s: Pointer to wpa_supplicant data
1125 * Returns: 0 is sched_scan was started or -1 otherwise
1126 *
1127 * This function is used to schedule periodic scans for neighboring
1128 * access points repeating the scan continuously.
1129 */
1130 int wpa_supplicant_req_sched_scan(struct wpa_supplicant *wpa_s)
1131 {
1132 struct wpa_driver_scan_params params;
1133 struct wpa_driver_scan_params *scan_params;
1134 enum wpa_states prev_state;
1135 struct wpa_ssid *ssid = NULL;
1136 struct wpabuf *extra_ie = NULL;
1137 int ret;
1138 unsigned int max_sched_scan_ssids;
1139 int wildcard = 0;
1140 int need_ssids;
1141
1142 if (!wpa_s->sched_scan_supported)
1143 return -1;
1144
1145 if (wpa_s->max_sched_scan_ssids > WPAS_MAX_SCAN_SSIDS)
1146 max_sched_scan_ssids = WPAS_MAX_SCAN_SSIDS;
1147 else
1148 max_sched_scan_ssids = wpa_s->max_sched_scan_ssids;
1149 if (max_sched_scan_ssids < 1 || wpa_s->conf->disable_scan_offload)
1150 return -1;
1151
1152 if (wpa_s->sched_scanning) {
1153 wpa_dbg(wpa_s, MSG_DEBUG, "Already sched scanning");
1154 return 0;
1155 }
1156
1157 need_ssids = 0;
1158 for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
1159 if (!wpas_network_disabled(wpa_s, ssid) && !ssid->scan_ssid) {
1160 /* Use wildcard SSID to find this network */
1161 wildcard = 1;
1162 } else if (!wpas_network_disabled(wpa_s, ssid) &&
1163 ssid->ssid_len)
1164 need_ssids++;
1165
1166 #ifdef CONFIG_WPS
1167 if (!wpas_network_disabled(wpa_s, ssid) &&
1168 ssid->key_mgmt == WPA_KEY_MGMT_WPS) {
1169 /*
1170 * Normal scan is more reliable and faster for WPS
1171 * operations and since these are for short periods of
1172 * time, the benefit of trying to use sched_scan would
1173 * be limited.
1174 */
1175 wpa_dbg(wpa_s, MSG_DEBUG, "Use normal scan instead of "
1176 "sched_scan for WPS");
1177 return -1;
1178 }
1179 #endif /* CONFIG_WPS */
1180 }
1181 if (wildcard)
1182 need_ssids++;
1183
1184 if (wpa_s->normal_scans < 3 &&
1185 (need_ssids <= wpa_s->max_scan_ssids ||
1186 wpa_s->max_scan_ssids >= (int) max_sched_scan_ssids)) {
1187 /*
1188 * When normal scan can speed up operations, use that for the
1189 * first operations before starting the sched_scan to allow
1190 * user space sleep more. We do this only if the normal scan
1191 * has functionality that is suitable for this or if the
1192 * sched_scan does not have better support for multiple SSIDs.
1193 */
1194 wpa_dbg(wpa_s, MSG_DEBUG, "Use normal scan instead of "
1195 "sched_scan for initial scans (normal_scans=%d)",
1196 wpa_s->normal_scans);
1197 return -1;
1198 }
1199
1200 os_memset(&params, 0, sizeof(params));
1201
1202 /* If we can't allocate space for the filters, we just don't filter */
1203 params.filter_ssids = os_calloc(wpa_s->max_match_sets,
1204 sizeof(struct wpa_driver_scan_filter));
1205
1206 prev_state = wpa_s->wpa_state;
1207 if (wpa_s->wpa_state == WPA_DISCONNECTED ||
1208 wpa_s->wpa_state == WPA_INACTIVE)
1209 wpa_supplicant_set_state(wpa_s, WPA_SCANNING);
1210
1211 if (wpa_s->autoscan_params != NULL) {
1212 scan_params = wpa_s->autoscan_params;
1213 goto scan;
1214 }
1215
1216 /* Find the starting point from which to continue scanning */
1217 ssid = wpa_s->conf->ssid;
1218 if (wpa_s->prev_sched_ssid) {
1219 while (ssid) {
1220 if (ssid == wpa_s->prev_sched_ssid) {
1221 ssid = ssid->next;
1222 break;
1223 }
1224 ssid = ssid->next;
1225 }
1226 }
1227
1228 if (!ssid || !wpa_s->prev_sched_ssid) {
1229 wpa_dbg(wpa_s, MSG_DEBUG, "Beginning of SSID list");
1230 if (wpa_s->conf->sched_scan_interval)
1231 wpa_s->sched_scan_interval =
1232 wpa_s->conf->sched_scan_interval;
1233 if (wpa_s->sched_scan_interval == 0)
1234 wpa_s->sched_scan_interval = 10;
1235 wpa_s->sched_scan_timeout = max_sched_scan_ssids * 2;
1236 wpa_s->first_sched_scan = 1;
1237 ssid = wpa_s->conf->ssid;
1238 wpa_s->prev_sched_ssid = ssid;
1239 }
1240
1241 if (wildcard) {
1242 wpa_dbg(wpa_s, MSG_DEBUG, "Add wildcard SSID to sched_scan");
1243 params.num_ssids++;
1244 }
1245
1246 while (ssid) {
1247 if (wpas_network_disabled(wpa_s, ssid))
1248 goto next;
1249
1250 if (params.num_filter_ssids < wpa_s->max_match_sets &&
1251 params.filter_ssids && ssid->ssid && ssid->ssid_len) {
1252 wpa_dbg(wpa_s, MSG_DEBUG, "add to filter ssid: %s",
1253 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
1254 os_memcpy(params.filter_ssids[params.num_filter_ssids].ssid,
1255 ssid->ssid, ssid->ssid_len);
1256 params.filter_ssids[params.num_filter_ssids].ssid_len =
1257 ssid->ssid_len;
1258 params.num_filter_ssids++;
1259 } else if (params.filter_ssids && ssid->ssid && ssid->ssid_len)
1260 {
1261 wpa_dbg(wpa_s, MSG_DEBUG, "Not enough room for SSID "
1262 "filter for sched_scan - drop filter");
1263 os_free(params.filter_ssids);
1264 params.filter_ssids = NULL;
1265 params.num_filter_ssids = 0;
1266 }
1267
1268 if (ssid->scan_ssid && ssid->ssid && ssid->ssid_len) {
1269 if (params.num_ssids == max_sched_scan_ssids)
1270 break; /* only room for broadcast SSID */
1271 wpa_dbg(wpa_s, MSG_DEBUG,
1272 "add to active scan ssid: %s",
1273 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
1274 params.ssids[params.num_ssids].ssid =
1275 ssid->ssid;
1276 params.ssids[params.num_ssids].ssid_len =
1277 ssid->ssid_len;
1278 params.num_ssids++;
1279 if (params.num_ssids >= max_sched_scan_ssids) {
1280 wpa_s->prev_sched_ssid = ssid;
1281 do {
1282 ssid = ssid->next;
1283 } while (ssid &&
1284 (wpas_network_disabled(wpa_s, ssid) ||
1285 !ssid->scan_ssid));
1286 break;
1287 }
1288 }
1289
1290 next:
1291 wpa_s->prev_sched_ssid = ssid;
1292 ssid = ssid->next;
1293 }
1294
1295 if (params.num_filter_ssids == 0) {
1296 os_free(params.filter_ssids);
1297 params.filter_ssids = NULL;
1298 }
1299
1300 extra_ie = wpa_supplicant_extra_ies(wpa_s);
1301 if (extra_ie) {
1302 params.extra_ies = wpabuf_head(extra_ie);
1303 params.extra_ies_len = wpabuf_len(extra_ie);
1304 }
1305
1306 if (wpa_s->conf->filter_rssi)
1307 params.filter_rssi = wpa_s->conf->filter_rssi;
1308
1309 /* See if user specified frequencies. If so, scan only those. */
1310 if (wpa_s->conf->freq_list && !params.freqs) {
1311 wpa_dbg(wpa_s, MSG_DEBUG,
1312 "Optimize scan based on conf->freq_list");
1313 int_array_concat(&params.freqs, wpa_s->conf->freq_list);
1314 }
1315
1316 scan_params = &params;
1317
1318 scan:
1319 if (ssid || !wpa_s->first_sched_scan) {
1320 wpa_dbg(wpa_s, MSG_DEBUG,
1321 "Starting sched scan: interval %d timeout %d",
1322 wpa_s->sched_scan_interval, wpa_s->sched_scan_timeout);
1323 } else {
1324 wpa_dbg(wpa_s, MSG_DEBUG,
1325 "Starting sched scan: interval %d (no timeout)",
1326 wpa_s->sched_scan_interval);
1327 }
1328
1329 wpa_setband_scan_freqs(wpa_s, scan_params);
1330
1331 if (wpa_s->mac_addr_rand_enable & MAC_ADDR_RAND_SCHED_SCAN) {
1332 params.mac_addr_rand = 1;
1333 if (wpa_s->mac_addr_sched_scan) {
1334 params.mac_addr = wpa_s->mac_addr_sched_scan;
1335 params.mac_addr_mask = wpa_s->mac_addr_sched_scan +
1336 ETH_ALEN;
1337 }
1338 }
1339
1340 ret = wpa_supplicant_start_sched_scan(wpa_s, scan_params,
1341 wpa_s->sched_scan_interval);
1342 wpabuf_free(extra_ie);
1343 os_free(params.filter_ssids);
1344 if (ret) {
1345 wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate sched scan");
1346 if (prev_state != wpa_s->wpa_state)
1347 wpa_supplicant_set_state(wpa_s, prev_state);
1348 return ret;
1349 }
1350
1351 /* If we have more SSIDs to scan, add a timeout so we scan them too */
1352 if (ssid || !wpa_s->first_sched_scan) {
1353 wpa_s->sched_scan_timed_out = 0;
1354 eloop_register_timeout(wpa_s->sched_scan_timeout, 0,
1355 wpa_supplicant_sched_scan_timeout,
1356 wpa_s, NULL);
1357 wpa_s->first_sched_scan = 0;
1358 wpa_s->sched_scan_timeout /= 2;
1359 wpa_s->sched_scan_interval *= 2;
1360 if (wpa_s->sched_scan_timeout < wpa_s->sched_scan_interval) {
1361 wpa_s->sched_scan_interval = 10;
1362 wpa_s->sched_scan_timeout = max_sched_scan_ssids * 2;
1363 }
1364 }
1365
1366 /* If there is no more ssids, start next time from the beginning */
1367 if (!ssid)
1368 wpa_s->prev_sched_ssid = NULL;
1369
1370 return 0;
1371 }
1372
1373
1374 /**
1375 * wpa_supplicant_cancel_scan - Cancel a scheduled scan request
1376 * @wpa_s: Pointer to wpa_supplicant data
1377 *
1378 * This function is used to cancel a scan request scheduled with
1379 * wpa_supplicant_req_scan().
1380 */
1381 void wpa_supplicant_cancel_scan(struct wpa_supplicant *wpa_s)
1382 {
1383 wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling scan request");
1384 eloop_cancel_timeout(wpa_supplicant_scan, wpa_s, NULL);
1385 }
1386
1387
1388 /**
1389 * wpa_supplicant_cancel_delayed_sched_scan - Stop a delayed scheduled scan
1390 * @wpa_s: Pointer to wpa_supplicant data
1391 *
1392 * This function is used to stop a delayed scheduled scan.
1393 */
1394 void wpa_supplicant_cancel_delayed_sched_scan(struct wpa_supplicant *wpa_s)
1395 {
1396 if (!wpa_s->sched_scan_supported)
1397 return;
1398
1399 wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling delayed sched scan");
1400 eloop_cancel_timeout(wpa_supplicant_delayed_sched_scan_timeout,
1401 wpa_s, NULL);
1402 }
1403
1404
1405 /**
1406 * wpa_supplicant_cancel_sched_scan - Stop running scheduled scans
1407 * @wpa_s: Pointer to wpa_supplicant data
1408 *
1409 * This function is used to stop a periodic scheduled scan.
1410 */
1411 void wpa_supplicant_cancel_sched_scan(struct wpa_supplicant *wpa_s)
1412 {
1413 if (!wpa_s->sched_scanning)
1414 return;
1415
1416 wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling sched scan");
1417 eloop_cancel_timeout(wpa_supplicant_sched_scan_timeout, wpa_s, NULL);
1418 wpa_supplicant_stop_sched_scan(wpa_s);
1419 }
1420
1421
1422 /**
1423 * wpa_supplicant_notify_scanning - Indicate possible scan state change
1424 * @wpa_s: Pointer to wpa_supplicant data
1425 * @scanning: Whether scanning is currently in progress
1426 *
1427 * This function is to generate scanning notifycations. It is called whenever
1428 * there may have been a change in scanning (scan started, completed, stopped).
1429 * wpas_notify_scanning() is called whenever the scanning state changed from the
1430 * previously notified state.
1431 */
1432 void wpa_supplicant_notify_scanning(struct wpa_supplicant *wpa_s,
1433 int scanning)
1434 {
1435 if (wpa_s->scanning != scanning) {
1436 wpa_s->scanning = scanning;
1437 wpas_notify_scanning(wpa_s);
1438 }
1439 }
1440
1441
1442 static int wpa_scan_get_max_rate(const struct wpa_scan_res *res)
1443 {
1444 int rate = 0;
1445 const u8 *ie;
1446 int i;
1447
1448 ie = wpa_scan_get_ie(res, WLAN_EID_SUPP_RATES);
1449 for (i = 0; ie && i < ie[1]; i++) {
1450 if ((ie[i + 2] & 0x7f) > rate)
1451 rate = ie[i + 2] & 0x7f;
1452 }
1453
1454 ie = wpa_scan_get_ie(res, WLAN_EID_EXT_SUPP_RATES);
1455 for (i = 0; ie && i < ie[1]; i++) {
1456 if ((ie[i + 2] & 0x7f) > rate)
1457 rate = ie[i + 2] & 0x7f;
1458 }
1459
1460 return rate;
1461 }
1462
1463
1464 /**
1465 * wpa_scan_get_ie - Fetch a specified information element from a scan result
1466 * @res: Scan result entry
1467 * @ie: Information element identitifier (WLAN_EID_*)
1468 * Returns: Pointer to the information element (id field) or %NULL if not found
1469 *
1470 * This function returns the first matching information element in the scan
1471 * result.
1472 */
1473 const u8 * wpa_scan_get_ie(const struct wpa_scan_res *res, u8 ie)
1474 {
1475 const u8 *end, *pos;
1476
1477 pos = (const u8 *) (res + 1);
1478 end = pos + res->ie_len;
1479
1480 while (pos + 1 < end) {
1481 if (pos + 2 + pos[1] > end)
1482 break;
1483 if (pos[0] == ie)
1484 return pos;
1485 pos += 2 + pos[1];
1486 }
1487
1488 return NULL;
1489 }
1490
1491
1492 /**
1493 * wpa_scan_get_vendor_ie - Fetch vendor information element from a scan result
1494 * @res: Scan result entry
1495 * @vendor_type: Vendor type (four octets starting the IE payload)
1496 * Returns: Pointer to the information element (id field) or %NULL if not found
1497 *
1498 * This function returns the first matching information element in the scan
1499 * result.
1500 */
1501 const u8 * wpa_scan_get_vendor_ie(const struct wpa_scan_res *res,
1502 u32 vendor_type)
1503 {
1504 const u8 *end, *pos;
1505
1506 pos = (const u8 *) (res + 1);
1507 end = pos + res->ie_len;
1508
1509 while (pos + 1 < end) {
1510 if (pos + 2 + pos[1] > end)
1511 break;
1512 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1513 vendor_type == WPA_GET_BE32(&pos[2]))
1514 return pos;
1515 pos += 2 + pos[1];
1516 }
1517
1518 return NULL;
1519 }
1520
1521
1522 /**
1523 * wpa_scan_get_vendor_ie_beacon - Fetch vendor information from a scan result
1524 * @res: Scan result entry
1525 * @vendor_type: Vendor type (four octets starting the IE payload)
1526 * Returns: Pointer to the information element (id field) or %NULL if not found
1527 *
1528 * This function returns the first matching information element in the scan
1529 * result.
1530 *
1531 * This function is like wpa_scan_get_vendor_ie(), but uses IE buffer only
1532 * from Beacon frames instead of either Beacon or Probe Response frames.
1533 */
1534 const u8 * wpa_scan_get_vendor_ie_beacon(const struct wpa_scan_res *res,
1535 u32 vendor_type)
1536 {
1537 const u8 *end, *pos;
1538
1539 if (res->beacon_ie_len == 0)
1540 return NULL;
1541
1542 pos = (const u8 *) (res + 1);
1543 pos += res->ie_len;
1544 end = pos + res->beacon_ie_len;
1545
1546 while (pos + 1 < end) {
1547 if (pos + 2 + pos[1] > end)
1548 break;
1549 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1550 vendor_type == WPA_GET_BE32(&pos[2]))
1551 return pos;
1552 pos += 2 + pos[1];
1553 }
1554
1555 return NULL;
1556 }
1557
1558
1559 /**
1560 * wpa_scan_get_vendor_ie_multi - Fetch vendor IE data from a scan result
1561 * @res: Scan result entry
1562 * @vendor_type: Vendor type (four octets starting the IE payload)
1563 * Returns: Pointer to the information element payload or %NULL if not found
1564 *
1565 * This function returns concatenated payload of possibly fragmented vendor
1566 * specific information elements in the scan result. The caller is responsible
1567 * for freeing the returned buffer.
1568 */
1569 struct wpabuf * wpa_scan_get_vendor_ie_multi(const struct wpa_scan_res *res,
1570 u32 vendor_type)
1571 {
1572 struct wpabuf *buf;
1573 const u8 *end, *pos;
1574
1575 buf = wpabuf_alloc(res->ie_len);
1576 if (buf == NULL)
1577 return NULL;
1578
1579 pos = (const u8 *) (res + 1);
1580 end = pos + res->ie_len;
1581
1582 while (pos + 1 < end) {
1583 if (pos + 2 + pos[1] > end)
1584 break;
1585 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1586 vendor_type == WPA_GET_BE32(&pos[2]))
1587 wpabuf_put_data(buf, pos + 2 + 4, pos[1] - 4);
1588 pos += 2 + pos[1];
1589 }
1590
1591 if (wpabuf_len(buf) == 0) {
1592 wpabuf_free(buf);
1593 buf = NULL;
1594 }
1595
1596 return buf;
1597 }
1598
1599
1600 /*
1601 * Channels with a great SNR can operate at full rate. What is a great SNR?
1602 * This doc https://supportforums.cisco.com/docs/DOC-12954 says, "the general
1603 * rule of thumb is that any SNR above 20 is good." This one
1604 * http://www.cisco.com/en/US/tech/tk722/tk809/technologies_q_and_a_item09186a00805e9a96.shtml#qa23
1605 * recommends 25 as a minimum SNR for 54 Mbps data rate. 30 is chosen here as a
1606 * conservative value.
1607 */
1608 #define GREAT_SNR 30
1609
1610 #define IS_5GHZ(n) (n > 4000)
1611
1612 /* Compare function for sorting scan results. Return >0 if @b is considered
1613 * better. */
1614 static int wpa_scan_result_compar(const void *a, const void *b)
1615 {
1616 #define MIN(a,b) a < b ? a : b
1617 struct wpa_scan_res **_wa = (void *) a;
1618 struct wpa_scan_res **_wb = (void *) b;
1619 struct wpa_scan_res *wa = *_wa;
1620 struct wpa_scan_res *wb = *_wb;
1621 int wpa_a, wpa_b;
1622 int snr_a, snr_b, snr_a_full, snr_b_full;
1623
1624 /* WPA/WPA2 support preferred */
1625 wpa_a = wpa_scan_get_vendor_ie(wa, WPA_IE_VENDOR_TYPE) != NULL ||
1626 wpa_scan_get_ie(wa, WLAN_EID_RSN) != NULL;
1627 wpa_b = wpa_scan_get_vendor_ie(wb, WPA_IE_VENDOR_TYPE) != NULL ||
1628 wpa_scan_get_ie(wb, WLAN_EID_RSN) != NULL;
1629
1630 if (wpa_b && !wpa_a)
1631 return 1;
1632 if (!wpa_b && wpa_a)
1633 return -1;
1634
1635 /* privacy support preferred */
1636 if ((wa->caps & IEEE80211_CAP_PRIVACY) == 0 &&
1637 (wb->caps & IEEE80211_CAP_PRIVACY))
1638 return 1;
1639 if ((wa->caps & IEEE80211_CAP_PRIVACY) &&
1640 (wb->caps & IEEE80211_CAP_PRIVACY) == 0)
1641 return -1;
1642
1643 if (wa->flags & wb->flags & WPA_SCAN_LEVEL_DBM) {
1644 snr_a_full = wa->snr;
1645 snr_a = MIN(wa->snr, GREAT_SNR);
1646 snr_b_full = wb->snr;
1647 snr_b = MIN(wa->snr, GREAT_SNR);
1648 } else {
1649 /* Level is not in dBm, so we can't calculate
1650 * SNR. Just use raw level (units unknown). */
1651 snr_a = snr_a_full = wa->level;
1652 snr_b = snr_b_full = wb->level;
1653 }
1654
1655 /* if SNR is close, decide by max rate or frequency band */
1656 if ((snr_a && snr_b && abs(snr_b - snr_a) < 5) ||
1657 (wa->qual && wb->qual && abs(wb->qual - wa->qual) < 10)) {
1658 if (wa->est_throughput != wb->est_throughput)
1659 return wb->est_throughput - wa->est_throughput;
1660 if (IS_5GHZ(wa->freq) ^ IS_5GHZ(wb->freq))
1661 return IS_5GHZ(wa->freq) ? -1 : 1;
1662 }
1663
1664 /* all things being equal, use SNR; if SNRs are
1665 * identical, use quality values since some drivers may only report
1666 * that value and leave the signal level zero */
1667 if (snr_b_full == snr_a_full)
1668 return wb->qual - wa->qual;
1669 return snr_b_full - snr_a_full;
1670 #undef MIN
1671 }
1672
1673
1674 #ifdef CONFIG_WPS
1675 /* Compare function for sorting scan results when searching a WPS AP for
1676 * provisioning. Return >0 if @b is considered better. */
1677 static int wpa_scan_result_wps_compar(const void *a, const void *b)
1678 {
1679 struct wpa_scan_res **_wa = (void *) a;
1680 struct wpa_scan_res **_wb = (void *) b;
1681 struct wpa_scan_res *wa = *_wa;
1682 struct wpa_scan_res *wb = *_wb;
1683 int uses_wps_a, uses_wps_b;
1684 struct wpabuf *wps_a, *wps_b;
1685 int res;
1686
1687 /* Optimization - check WPS IE existence before allocated memory and
1688 * doing full reassembly. */
1689 uses_wps_a = wpa_scan_get_vendor_ie(wa, WPS_IE_VENDOR_TYPE) != NULL;
1690 uses_wps_b = wpa_scan_get_vendor_ie(wb, WPS_IE_VENDOR_TYPE) != NULL;
1691 if (uses_wps_a && !uses_wps_b)
1692 return -1;
1693 if (!uses_wps_a && uses_wps_b)
1694 return 1;
1695
1696 if (uses_wps_a && uses_wps_b) {
1697 wps_a = wpa_scan_get_vendor_ie_multi(wa, WPS_IE_VENDOR_TYPE);
1698 wps_b = wpa_scan_get_vendor_ie_multi(wb, WPS_IE_VENDOR_TYPE);
1699 res = wps_ap_priority_compar(wps_a, wps_b);
1700 wpabuf_free(wps_a);
1701 wpabuf_free(wps_b);
1702 if (res)
1703 return res;
1704 }
1705
1706 /*
1707 * Do not use current AP security policy as a sorting criteria during
1708 * WPS provisioning step since the AP may get reconfigured at the
1709 * completion of provisioning.
1710 */
1711
1712 /* all things being equal, use signal level; if signal levels are
1713 * identical, use quality values since some drivers may only report
1714 * that value and leave the signal level zero */
1715 if (wb->level == wa->level)
1716 return wb->qual - wa->qual;
1717 return wb->level - wa->level;
1718 }
1719 #endif /* CONFIG_WPS */
1720
1721
1722 static void dump_scan_res(struct wpa_scan_results *scan_res)
1723 {
1724 #ifndef CONFIG_NO_STDOUT_DEBUG
1725 size_t i;
1726
1727 if (scan_res->res == NULL || scan_res->num == 0)
1728 return;
1729
1730 wpa_printf(MSG_EXCESSIVE, "Sorted scan results");
1731
1732 for (i = 0; i < scan_res->num; i++) {
1733 struct wpa_scan_res *r = scan_res->res[i];
1734 u8 *pos;
1735 if (r->flags & WPA_SCAN_LEVEL_DBM) {
1736 int noise_valid = !(r->flags & WPA_SCAN_NOISE_INVALID);
1737
1738 wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d "
1739 "noise=%d%s level=%d snr=%d%s flags=0x%x age=%u est=%u",
1740 MAC2STR(r->bssid), r->freq, r->qual,
1741 r->noise, noise_valid ? "" : "~", r->level,
1742 r->snr, r->snr >= GREAT_SNR ? "*" : "",
1743 r->flags,
1744 r->age, r->est_throughput);
1745 } else {
1746 wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d "
1747 "noise=%d level=%d flags=0x%x age=%u est=%u",
1748 MAC2STR(r->bssid), r->freq, r->qual,
1749 r->noise, r->level, r->flags, r->age,
1750 r->est_throughput);
1751 }
1752 pos = (u8 *) (r + 1);
1753 if (r->ie_len)
1754 wpa_hexdump(MSG_EXCESSIVE, "IEs", pos, r->ie_len);
1755 pos += r->ie_len;
1756 if (r->beacon_ie_len)
1757 wpa_hexdump(MSG_EXCESSIVE, "Beacon IEs",
1758 pos, r->beacon_ie_len);
1759 }
1760 #endif /* CONFIG_NO_STDOUT_DEBUG */
1761 }
1762
1763
1764 /**
1765 * wpa_supplicant_filter_bssid_match - Is the specified BSSID allowed
1766 * @wpa_s: Pointer to wpa_supplicant data
1767 * @bssid: BSSID to check
1768 * Returns: 0 if the BSSID is filtered or 1 if not
1769 *
1770 * This function is used to filter out specific BSSIDs from scan reslts mainly
1771 * for testing purposes (SET bssid_filter ctrl_iface command).
1772 */
1773 int wpa_supplicant_filter_bssid_match(struct wpa_supplicant *wpa_s,
1774 const u8 *bssid)
1775 {
1776 size_t i;
1777
1778 if (wpa_s->bssid_filter == NULL)
1779 return 1;
1780
1781 for (i = 0; i < wpa_s->bssid_filter_count; i++) {
1782 if (os_memcmp(wpa_s->bssid_filter + i * ETH_ALEN, bssid,
1783 ETH_ALEN) == 0)
1784 return 1;
1785 }
1786
1787 return 0;
1788 }
1789
1790
1791 static void filter_scan_res(struct wpa_supplicant *wpa_s,
1792 struct wpa_scan_results *res)
1793 {
1794 size_t i, j;
1795
1796 if (wpa_s->bssid_filter == NULL)
1797 return;
1798
1799 for (i = 0, j = 0; i < res->num; i++) {
1800 if (wpa_supplicant_filter_bssid_match(wpa_s,
1801 res->res[i]->bssid)) {
1802 res->res[j++] = res->res[i];
1803 } else {
1804 os_free(res->res[i]);
1805 res->res[i] = NULL;
1806 }
1807 }
1808
1809 if (res->num != j) {
1810 wpa_printf(MSG_DEBUG, "Filtered out %d scan results",
1811 (int) (res->num - j));
1812 res->num = j;
1813 }
1814 }
1815
1816
1817 /*
1818 * Noise floor values to use when we have signal strength
1819 * measurements, but no noise floor measurments. These values were
1820 * measured in an office environment with many APs.
1821 */
1822 #define DEFAULT_NOISE_FLOOR_2GHZ (-89)
1823 #define DEFAULT_NOISE_FLOOR_5GHZ (-92)
1824
1825 static void scan_snr(struct wpa_scan_res *res)
1826 {
1827 if (res->flags & WPA_SCAN_NOISE_INVALID) {
1828 res->noise = IS_5GHZ(res->freq) ?
1829 DEFAULT_NOISE_FLOOR_5GHZ :
1830 DEFAULT_NOISE_FLOOR_2GHZ;
1831 }
1832
1833 if (res->flags & WPA_SCAN_LEVEL_DBM) {
1834 res->snr = res->level - res->noise;
1835 } else {
1836 /* Level is not in dBm, so we can't calculate
1837 * SNR. Just use raw level (units unknown). */
1838 res->snr = res->level;
1839 }
1840 }
1841
1842
1843 static unsigned int max_ht20_rate(int snr)
1844 {
1845 if (snr < 6)
1846 return 6500; /* HT20 MCS0 */
1847 if (snr < 8)
1848 return 13000; /* HT20 MCS1 */
1849 if (snr < 13)
1850 return 19500; /* HT20 MCS2 */
1851 if (snr < 17)
1852 return 26000; /* HT20 MCS3 */
1853 if (snr < 20)
1854 return 39000; /* HT20 MCS4 */
1855 if (snr < 23)
1856 return 52000; /* HT20 MCS5 */
1857 if (snr < 24)
1858 return 58500; /* HT20 MCS6 */
1859 return 65000; /* HT20 MCS7 */
1860 }
1861
1862
1863 static unsigned int max_ht40_rate(int snr)
1864 {
1865 if (snr < 3)
1866 return 13500; /* HT40 MCS0 */
1867 if (snr < 6)
1868 return 27000; /* HT40 MCS1 */
1869 if (snr < 10)
1870 return 40500; /* HT40 MCS2 */
1871 if (snr < 15)
1872 return 54000; /* HT40 MCS3 */
1873 if (snr < 17)
1874 return 81000; /* HT40 MCS4 */
1875 if (snr < 22)
1876 return 108000; /* HT40 MCS5 */
1877 if (snr < 24)
1878 return 121500; /* HT40 MCS6 */
1879 return 135000; /* HT40 MCS7 */
1880 }
1881
1882
1883 static unsigned int max_vht80_rate(int snr)
1884 {
1885 if (snr < 1)
1886 return 0;
1887 if (snr < 2)
1888 return 29300; /* VHT80 MCS0 */
1889 if (snr < 5)
1890 return 58500; /* VHT80 MCS1 */
1891 if (snr < 9)
1892 return 87800; /* VHT80 MCS2 */
1893 if (snr < 11)
1894 return 117000; /* VHT80 MCS3 */
1895 if (snr < 15)
1896 return 175500; /* VHT80 MCS4 */
1897 if (snr < 16)
1898 return 234000; /* VHT80 MCS5 */
1899 if (snr < 18)
1900 return 263300; /* VHT80 MCS6 */
1901 if (snr < 20)
1902 return 292500; /* VHT80 MCS7 */
1903 if (snr < 22)
1904 return 351000; /* VHT80 MCS8 */
1905 return 390000; /* VHT80 MCS9 */
1906 }
1907
1908
1909 static void scan_est_throughput(struct wpa_supplicant *wpa_s,
1910 struct wpa_scan_res *res)
1911 {
1912 enum local_hw_capab capab = wpa_s->hw_capab;
1913 int rate; /* max legacy rate in 500 kb/s units */
1914 const u8 *ie;
1915 unsigned int est, tmp;
1916 int snr = res->snr;
1917
1918 if (res->est_throughput)
1919 return;
1920
1921 /* Get maximum legacy rate */
1922 rate = wpa_scan_get_max_rate(res);
1923
1924 /* Limit based on estimated SNR */
1925 if (rate > 1 * 2 && snr < 1)
1926 rate = 1 * 2;
1927 else if (rate > 2 * 2 && snr < 4)
1928 rate = 2 * 2;
1929 else if (rate > 6 * 2 && snr < 5)
1930 rate = 6 * 2;
1931 else if (rate > 9 * 2 && snr < 6)
1932 rate = 9 * 2;
1933 else if (rate > 12 * 2 && snr < 7)
1934 rate = 12 * 2;
1935 else if (rate > 18 * 2 && snr < 10)
1936 rate = 18 * 2;
1937 else if (rate > 24 * 2 && snr < 11)
1938 rate = 24 * 2;
1939 else if (rate > 36 * 2 && snr < 15)
1940 rate = 36 * 2;
1941 else if (rate > 48 * 2 && snr < 19)
1942 rate = 48 * 2;
1943 else if (rate > 54 * 2 && snr < 21)
1944 rate = 54 * 2;
1945 est = rate * 500;
1946
1947 if (capab == CAPAB_HT || capab == CAPAB_HT40 || capab == CAPAB_VHT) {
1948 ie = wpa_scan_get_ie(res, WLAN_EID_HT_CAP);
1949 if (ie) {
1950 tmp = max_ht20_rate(snr);
1951 if (tmp > est)
1952 est = tmp;
1953 }
1954 }
1955
1956 if (capab == CAPAB_HT40 || capab == CAPAB_VHT) {
1957 ie = wpa_scan_get_ie(res, WLAN_EID_HT_OPERATION);
1958 if (ie && ie[1] >= 2 &&
1959 (ie[3] & HT_INFO_HT_PARAM_SECONDARY_CHNL_OFF_MASK)) {
1960 tmp = max_ht40_rate(snr);
1961 if (tmp > est)
1962 est = tmp;
1963 }
1964 }
1965
1966 if (capab == CAPAB_VHT) {
1967 /* Use +1 to assume VHT is always faster than HT */
1968 ie = wpa_scan_get_ie(res, WLAN_EID_VHT_CAP);
1969 if (ie) {
1970 tmp = max_ht20_rate(snr) + 1;
1971 if (tmp > est)
1972 est = tmp;
1973
1974 ie = wpa_scan_get_ie(res, WLAN_EID_HT_OPERATION);
1975 if (ie && ie[1] >= 2 &&
1976 (ie[3] &
1977 HT_INFO_HT_PARAM_SECONDARY_CHNL_OFF_MASK)) {
1978 tmp = max_ht40_rate(snr) + 1;
1979 if (tmp > est)
1980 est = tmp;
1981 }
1982
1983 ie = wpa_scan_get_ie(res, WLAN_EID_VHT_OPERATION);
1984 if (ie && ie[1] >= 1 &&
1985 (ie[2] & VHT_OPMODE_CHANNEL_WIDTH_MASK)) {
1986 tmp = max_vht80_rate(snr) + 1;
1987 if (tmp > est)
1988 est = tmp;
1989 }
1990 }
1991 }
1992
1993 /* TODO: channel utilization and AP load (e.g., from AP Beacon) */
1994
1995 res->est_throughput = est;
1996 }
1997
1998
1999 /**
2000 * wpa_supplicant_get_scan_results - Get scan results
2001 * @wpa_s: Pointer to wpa_supplicant data
2002 * @info: Information about what was scanned or %NULL if not available
2003 * @new_scan: Whether a new scan was performed
2004 * Returns: Scan results, %NULL on failure
2005 *
2006 * This function request the current scan results from the driver and updates
2007 * the local BSS list wpa_s->bss. The caller is responsible for freeing the
2008 * results with wpa_scan_results_free().
2009 */
2010 struct wpa_scan_results *
2011 wpa_supplicant_get_scan_results(struct wpa_supplicant *wpa_s,
2012 struct scan_info *info, int new_scan)
2013 {
2014 struct wpa_scan_results *scan_res;
2015 size_t i;
2016 int (*compar)(const void *, const void *) = wpa_scan_result_compar;
2017
2018 scan_res = wpa_drv_get_scan_results2(wpa_s);
2019 if (scan_res == NULL) {
2020 wpa_dbg(wpa_s, MSG_DEBUG, "Failed to get scan results");
2021 return NULL;
2022 }
2023 if (scan_res->fetch_time.sec == 0) {
2024 /*
2025 * Make sure we have a valid timestamp if the driver wrapper
2026 * does not set this.
2027 */
2028 os_get_reltime(&scan_res->fetch_time);
2029 }
2030 filter_scan_res(wpa_s, scan_res);
2031
2032 for (i = 0; i < scan_res->num; i++) {
2033 struct wpa_scan_res *scan_res_item = scan_res->res[i];
2034
2035 scan_snr(scan_res_item);
2036 scan_est_throughput(wpa_s, scan_res_item);
2037 }
2038
2039 #ifdef CONFIG_WPS
2040 if (wpas_wps_searching(wpa_s)) {
2041 wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Order scan results with WPS "
2042 "provisioning rules");
2043 compar = wpa_scan_result_wps_compar;
2044 }
2045 #endif /* CONFIG_WPS */
2046
2047 qsort(scan_res->res, scan_res->num, sizeof(struct wpa_scan_res *),
2048 compar);
2049 dump_scan_res(scan_res);
2050
2051 wpa_bss_update_start(wpa_s);
2052 for (i = 0; i < scan_res->num; i++)
2053 wpa_bss_update_scan_res(wpa_s, scan_res->res[i],
2054 &scan_res->fetch_time);
2055 wpa_bss_update_end(wpa_s, info, new_scan);
2056
2057 return scan_res;
2058 }
2059
2060
2061 /**
2062 * wpa_supplicant_update_scan_results - Update scan results from the driver
2063 * @wpa_s: Pointer to wpa_supplicant data
2064 * Returns: 0 on success, -1 on failure
2065 *
2066 * This function updates the BSS table within wpa_supplicant based on the
2067 * currently available scan results from the driver without requesting a new
2068 * scan. This is used in cases where the driver indicates an association
2069 * (including roaming within ESS) and wpa_supplicant does not yet have the
2070 * needed information to complete the connection (e.g., to perform validation
2071 * steps in 4-way handshake).
2072 */
2073 int wpa_supplicant_update_scan_results(struct wpa_supplicant *wpa_s)
2074 {
2075 struct wpa_scan_results *scan_res;
2076 scan_res = wpa_supplicant_get_scan_results(wpa_s, NULL, 0);
2077 if (scan_res == NULL)
2078 return -1;
2079 wpa_scan_results_free(scan_res);
2080
2081 return 0;
2082 }
2083
2084
2085 /**
2086 * scan_only_handler - Reports scan results
2087 */
2088 void scan_only_handler(struct wpa_supplicant *wpa_s,
2089 struct wpa_scan_results *scan_res)
2090 {
2091 wpa_dbg(wpa_s, MSG_DEBUG, "Scan-only results received");
2092 if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
2093 wpa_s->manual_scan_use_id && wpa_s->own_scan_running) {
2094 wpa_msg_ctrl(wpa_s, MSG_INFO, WPA_EVENT_SCAN_RESULTS "id=%u",
2095 wpa_s->manual_scan_id);
2096 wpa_s->manual_scan_use_id = 0;
2097 } else {
2098 wpa_msg_ctrl(wpa_s, MSG_INFO, WPA_EVENT_SCAN_RESULTS);
2099 }
2100 wpas_notify_scan_results(wpa_s);
2101 wpas_notify_scan_done(wpa_s, 1);
2102 if (wpa_s->scan_work) {
2103 struct wpa_radio_work *work = wpa_s->scan_work;
2104 wpa_s->scan_work = NULL;
2105 radio_work_done(work);
2106 }
2107 }
2108
2109
2110 int wpas_scan_scheduled(struct wpa_supplicant *wpa_s)
2111 {
2112 return eloop_is_timeout_registered(wpa_supplicant_scan, wpa_s, NULL);
2113 }
2114
2115
2116 struct wpa_driver_scan_params *
2117 wpa_scan_clone_params(const struct wpa_driver_scan_params *src)
2118 {
2119 struct wpa_driver_scan_params *params;
2120 size_t i;
2121 u8 *n;
2122
2123 params = os_zalloc(sizeof(*params));
2124 if (params == NULL)
2125 return NULL;
2126
2127 for (i = 0; i < src->num_ssids; i++) {
2128 if (src->ssids[i].ssid) {
2129 n = os_malloc(src->ssids[i].ssid_len);
2130 if (n == NULL)
2131 goto failed;
2132 os_memcpy(n, src->ssids[i].ssid,
2133 src->ssids[i].ssid_len);
2134 params->ssids[i].ssid = n;
2135 params->ssids[i].ssid_len = src->ssids[i].ssid_len;
2136 }
2137 }
2138 params->num_ssids = src->num_ssids;
2139
2140 if (src->extra_ies) {
2141 n = os_malloc(src->extra_ies_len);
2142 if (n == NULL)
2143 goto failed;
2144 os_memcpy(n, src->extra_ies, src->extra_ies_len);
2145 params->extra_ies = n;
2146 params->extra_ies_len = src->extra_ies_len;
2147 }
2148
2149 if (src->freqs) {
2150 int len = int_array_len(src->freqs);
2151 params->freqs = os_malloc((len + 1) * sizeof(int));
2152 if (params->freqs == NULL)
2153 goto failed;
2154 os_memcpy(params->freqs, src->freqs, (len + 1) * sizeof(int));
2155 }
2156
2157 if (src->filter_ssids) {
2158 params->filter_ssids = os_malloc(sizeof(*params->filter_ssids) *
2159 src->num_filter_ssids);
2160 if (params->filter_ssids == NULL)
2161 goto failed;
2162 os_memcpy(params->filter_ssids, src->filter_ssids,
2163 sizeof(*params->filter_ssids) *
2164 src->num_filter_ssids);
2165 params->num_filter_ssids = src->num_filter_ssids;
2166 }
2167
2168 params->filter_rssi = src->filter_rssi;
2169 params->p2p_probe = src->p2p_probe;
2170 params->only_new_results = src->only_new_results;
2171 params->low_priority = src->low_priority;
2172
2173 if (src->mac_addr_rand) {
2174 params->mac_addr_rand = src->mac_addr_rand;
2175
2176 if (src->mac_addr && src->mac_addr_mask) {
2177 u8 *mac_addr;
2178
2179 mac_addr = os_malloc(2 * ETH_ALEN);
2180 if (!mac_addr)
2181 goto failed;
2182
2183 os_memcpy(mac_addr, src->mac_addr, ETH_ALEN);
2184 os_memcpy(mac_addr + ETH_ALEN, src->mac_addr_mask,
2185 ETH_ALEN);
2186 params->mac_addr = mac_addr;
2187 params->mac_addr_mask = mac_addr + ETH_ALEN;
2188 }
2189 }
2190 return params;
2191
2192 failed:
2193 wpa_scan_free_params(params);
2194 return NULL;
2195 }
2196
2197
2198 void wpa_scan_free_params(struct wpa_driver_scan_params *params)
2199 {
2200 size_t i;
2201
2202 if (params == NULL)
2203 return;
2204
2205 for (i = 0; i < params->num_ssids; i++)
2206 os_free((u8 *) params->ssids[i].ssid);
2207 os_free((u8 *) params->extra_ies);
2208 os_free(params->freqs);
2209 os_free(params->filter_ssids);
2210
2211 /*
2212 * Note: params->mac_addr_mask points to same memory allocation and
2213 * must not be freed separately.
2214 */
2215 os_free((u8 *) params->mac_addr);
2216
2217 os_free(params);
2218 }
2219
2220
2221 int wpas_start_pno(struct wpa_supplicant *wpa_s)
2222 {
2223 int ret, interval, prio;
2224 size_t i, num_ssid, num_match_ssid;
2225 struct wpa_ssid *ssid;
2226 struct wpa_driver_scan_params params;
2227
2228 if (!wpa_s->sched_scan_supported)
2229 return -1;
2230
2231 if (wpa_s->pno || wpa_s->pno_sched_pending)
2232 return 0;
2233
2234 if ((wpa_s->wpa_state > WPA_SCANNING) &&
2235 (wpa_s->wpa_state <= WPA_COMPLETED)) {
2236 wpa_printf(MSG_ERROR, "PNO: In assoc process");
2237 return -EAGAIN;
2238 }
2239
2240 if (wpa_s->wpa_state == WPA_SCANNING) {
2241 wpa_supplicant_cancel_scan(wpa_s);
2242 if (wpa_s->sched_scanning) {
2243 wpa_printf(MSG_DEBUG, "Schedule PNO on completion of "
2244 "ongoing sched scan");
2245 wpa_supplicant_cancel_sched_scan(wpa_s);
2246 wpa_s->pno_sched_pending = 1;
2247 return 0;
2248 }
2249 }
2250
2251 os_memset(&params, 0, sizeof(params));
2252
2253 num_ssid = num_match_ssid = 0;
2254 ssid = wpa_s->conf->ssid;
2255 while (ssid) {
2256 if (!wpas_network_disabled(wpa_s, ssid)) {
2257 num_match_ssid++;
2258 if (ssid->scan_ssid)
2259 num_ssid++;
2260 }
2261 ssid = ssid->next;
2262 }
2263
2264 if (num_match_ssid == 0) {
2265 wpa_printf(MSG_DEBUG, "PNO: No configured SSIDs");
2266 return -1;
2267 }
2268
2269 if (num_match_ssid > num_ssid) {
2270 params.num_ssids++; /* wildcard */
2271 num_ssid++;
2272 }
2273
2274 if (num_ssid > WPAS_MAX_SCAN_SSIDS) {
2275 wpa_printf(MSG_DEBUG, "PNO: Use only the first %u SSIDs from "
2276 "%u", WPAS_MAX_SCAN_SSIDS, (unsigned int) num_ssid);
2277 num_ssid = WPAS_MAX_SCAN_SSIDS;
2278 }
2279
2280 if (num_match_ssid > wpa_s->max_match_sets) {
2281 num_match_ssid = wpa_s->max_match_sets;
2282 wpa_dbg(wpa_s, MSG_DEBUG, "PNO: Too many SSIDs to match");
2283 }
2284 params.filter_ssids = os_calloc(num_match_ssid,
2285 sizeof(struct wpa_driver_scan_filter));
2286 if (params.filter_ssids == NULL)
2287 return -1;
2288
2289 i = 0;
2290 prio = 0;
2291 ssid = wpa_s->conf->pssid[prio];
2292 while (ssid) {
2293 if (!wpas_network_disabled(wpa_s, ssid)) {
2294 if (ssid->scan_ssid && params.num_ssids < num_ssid) {
2295 params.ssids[params.num_ssids].ssid =
2296 ssid->ssid;
2297 params.ssids[params.num_ssids].ssid_len =
2298 ssid->ssid_len;
2299 params.num_ssids++;
2300 }
2301 os_memcpy(params.filter_ssids[i].ssid, ssid->ssid,
2302 ssid->ssid_len);
2303 params.filter_ssids[i].ssid_len = ssid->ssid_len;
2304 params.num_filter_ssids++;
2305 i++;
2306 if (i == num_match_ssid)
2307 break;
2308 }
2309 if (ssid->pnext)
2310 ssid = ssid->pnext;
2311 else if (prio + 1 == wpa_s->conf->num_prio)
2312 break;
2313 else
2314 ssid = wpa_s->conf->pssid[++prio];
2315 }
2316
2317 if (wpa_s->conf->filter_rssi)
2318 params.filter_rssi = wpa_s->conf->filter_rssi;
2319
2320 interval = wpa_s->conf->sched_scan_interval ?
2321 wpa_s->conf->sched_scan_interval : 10;
2322
2323 if (params.freqs == NULL && wpa_s->manual_sched_scan_freqs) {
2324 wpa_dbg(wpa_s, MSG_DEBUG, "Limit sched scan to specified channels");
2325 params.freqs = wpa_s->manual_sched_scan_freqs;
2326 }
2327
2328 if (wpa_s->mac_addr_rand_enable & MAC_ADDR_RAND_PNO) {
2329 params.mac_addr_rand = 1;
2330 if (wpa_s->mac_addr_pno) {
2331 params.mac_addr = wpa_s->mac_addr_pno;
2332 params.mac_addr_mask = wpa_s->mac_addr_pno + ETH_ALEN;
2333 }
2334 }
2335
2336 ret = wpa_supplicant_start_sched_scan(wpa_s, &params, interval);
2337 os_free(params.filter_ssids);
2338 if (ret == 0)
2339 wpa_s->pno = 1;
2340 else
2341 wpa_msg(wpa_s, MSG_ERROR, "Failed to schedule PNO");
2342 return ret;
2343 }
2344
2345
2346 int wpas_stop_pno(struct wpa_supplicant *wpa_s)
2347 {
2348 int ret = 0;
2349
2350 if (!wpa_s->pno)
2351 return 0;
2352
2353 ret = wpa_supplicant_stop_sched_scan(wpa_s);
2354
2355 wpa_s->pno = 0;
2356 wpa_s->pno_sched_pending = 0;
2357
2358 if (wpa_s->wpa_state == WPA_SCANNING)
2359 wpa_supplicant_req_scan(wpa_s, 0, 0);
2360
2361 return ret;
2362 }
2363
2364
2365 void wpas_mac_addr_rand_scan_clear(struct wpa_supplicant *wpa_s,
2366 unsigned int type)
2367 {
2368 type &= MAC_ADDR_RAND_ALL;
2369 wpa_s->mac_addr_rand_enable &= ~type;
2370
2371 if (type & MAC_ADDR_RAND_SCAN) {
2372 os_free(wpa_s->mac_addr_scan);
2373 wpa_s->mac_addr_scan = NULL;
2374 }
2375
2376 if (type & MAC_ADDR_RAND_SCHED_SCAN) {
2377 os_free(wpa_s->mac_addr_sched_scan);
2378 wpa_s->mac_addr_sched_scan = NULL;
2379 }
2380
2381 if (type & MAC_ADDR_RAND_PNO) {
2382 os_free(wpa_s->mac_addr_pno);
2383 wpa_s->mac_addr_pno = NULL;
2384 }
2385 }
2386
2387
2388 int wpas_mac_addr_rand_scan_set(struct wpa_supplicant *wpa_s,
2389 unsigned int type, const u8 *addr,
2390 const u8 *mask)
2391 {
2392 u8 *tmp = NULL;
2393
2394 wpas_mac_addr_rand_scan_clear(wpa_s, type);
2395
2396 if (addr) {
2397 tmp = os_malloc(2 * ETH_ALEN);
2398 if (!tmp)
2399 return -1;
2400 os_memcpy(tmp, addr, ETH_ALEN);
2401 os_memcpy(tmp + ETH_ALEN, mask, ETH_ALEN);
2402 }
2403
2404 if (type == MAC_ADDR_RAND_SCAN) {
2405 wpa_s->mac_addr_scan = tmp;
2406 } else if (type == MAC_ADDR_RAND_SCHED_SCAN) {
2407 wpa_s->mac_addr_sched_scan = tmp;
2408 } else if (type == MAC_ADDR_RAND_PNO) {
2409 wpa_s->mac_addr_pno = tmp;
2410 } else {
2411 wpa_printf(MSG_INFO,
2412 "scan: Invalid MAC randomization type=0x%x",
2413 type);
2414 os_free(tmp);
2415 return -1;
2416 }
2417
2418 wpa_s->mac_addr_rand_enable |= type;
2419 return 0;
2420 }
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