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