Line data Source code
1 : /*
2 : * WPA Supplicant - Scanning
3 : * Copyright (c) 2003-2014, Jouni Malinen <j@w1.fi>
4 : *
5 : * This software may be distributed under the terms of the BSD license.
6 : * See README for more details.
7 : */
8 :
9 : #include "utils/includes.h"
10 :
11 : #include "utils/common.h"
12 : #include "utils/eloop.h"
13 : #include "common/ieee802_11_defs.h"
14 : #include "common/wpa_ctrl.h"
15 : #include "config.h"
16 : #include "wpa_supplicant_i.h"
17 : #include "driver_i.h"
18 : #include "wps_supplicant.h"
19 : #include "p2p_supplicant.h"
20 : #include "p2p/p2p.h"
21 : #include "hs20_supplicant.h"
22 : #include "notify.h"
23 : #include "bss.h"
24 : #include "scan.h"
25 : #include "mesh.h"
26 :
27 :
28 2 : 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 2 : ssid = wpa_supplicant_get_ssid(wpa_s);
34 2 : if (ssid == NULL)
35 3 : return;
36 :
37 1 : if (wpa_s->current_ssid == NULL) {
38 0 : wpa_s->current_ssid = ssid;
39 0 : if (wpa_s->current_ssid != NULL)
40 0 : wpas_notify_network_changed(wpa_s);
41 : }
42 1 : wpa_supplicant_initiate_eapol(wpa_s);
43 1 : wpa_dbg(wpa_s, MSG_DEBUG, "Already associated with a configured "
44 : "network - generating associated event");
45 1 : os_memset(&data, 0, sizeof(data));
46 1 : wpa_supplicant_event(wpa_s, EVENT_ASSOC, &data);
47 : }
48 :
49 :
50 : #ifdef CONFIG_WPS
51 2020 : 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 2020 : int wps = 0;
56 :
57 3541 : for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
58 1627 : if (!(ssid->key_mgmt & WPA_KEY_MGMT_WPS))
59 1216 : continue;
60 :
61 411 : wps = 1;
62 411 : *req_type = wpas_wps_get_req_type(ssid);
63 411 : if (!ssid->eap.phase1)
64 0 : continue;
65 :
66 411 : if (os_strstr(ssid->eap.phase1, "pbc=1"))
67 106 : return 2;
68 : }
69 :
70 : #ifdef CONFIG_P2P
71 3809 : if (!wpa_s->global->p2p_disabled && wpa_s->global->p2p &&
72 1895 : !wpa_s->conf->p2p_disabled) {
73 1895 : wpa_s->wps->dev.p2p = 1;
74 1895 : if (!wps) {
75 1592 : wps = 1;
76 1592 : *req_type = WPS_REQ_ENROLLEE_INFO;
77 : }
78 : }
79 : #endif /* CONFIG_P2P */
80 :
81 1914 : 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 3837 : int wpa_supplicant_enabled_networks(struct wpa_supplicant *wpa_s)
96 : {
97 3837 : struct wpa_ssid *ssid = wpa_s->conf->ssid;
98 3837 : int count = 0, disabled = 0;
99 :
100 3837 : if (wpa_s->p2p_mgmt)
101 8 : return 0; /* no normal network profiles on p2p_mgmt interface */
102 :
103 10140 : while (ssid) {
104 2482 : if (!wpas_network_disabled(wpa_s, ssid))
105 2318 : count++;
106 : else
107 164 : disabled++;
108 2482 : ssid = ssid->next;
109 : }
110 4077 : if (wpa_s->conf->cred && wpa_s->conf->interworking &&
111 248 : wpa_s->conf->auto_interworking)
112 28 : count++;
113 3829 : if (count == 0 && disabled > 0) {
114 23 : wpa_dbg(wpa_s, MSG_DEBUG, "No enabled networks (%d disabled "
115 : "networks)", disabled);
116 : }
117 3829 : return count;
118 : }
119 :
120 :
121 14 : static void wpa_supplicant_assoc_try(struct wpa_supplicant *wpa_s,
122 : struct wpa_ssid *ssid)
123 : {
124 31 : while (ssid) {
125 15 : if (!wpas_network_disabled(wpa_s, ssid))
126 12 : break;
127 3 : ssid = ssid->next;
128 : }
129 :
130 : /* ap_scan=2 mode - try to associate with each SSID. */
131 14 : if (ssid == NULL) {
132 2 : wpa_dbg(wpa_s, MSG_DEBUG, "wpa_supplicant_assoc_try: Reached "
133 : "end of scan list - go back to beginning");
134 2 : wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
135 2 : wpa_supplicant_req_scan(wpa_s, 0, 0);
136 16 : return;
137 : }
138 12 : if (ssid->next) {
139 : /* Continue from the next SSID on the next attempt. */
140 3 : wpa_s->prev_scan_ssid = ssid;
141 : } else {
142 : /* Start from the beginning of the SSID list. */
143 9 : wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
144 : }
145 12 : wpa_supplicant_associate(wpa_s, NULL, ssid);
146 : }
147 :
148 :
149 2048 : static void wpas_trigger_scan_cb(struct wpa_radio_work *work, int deinit)
150 : {
151 2048 : struct wpa_supplicant *wpa_s = work->wpa_s;
152 2048 : struct wpa_driver_scan_params *params = work->ctx;
153 : int ret;
154 :
155 2048 : if (deinit) {
156 15 : if (!work->started) {
157 0 : wpa_scan_free_params(params);
158 0 : return;
159 : }
160 15 : wpa_supplicant_notify_scanning(wpa_s, 0);
161 15 : wpas_notify_scan_done(wpa_s, 0);
162 15 : wpa_s->scan_work = NULL;
163 15 : return;
164 : }
165 :
166 2033 : if (wpas_update_random_addr_disassoc(wpa_s) < 0) {
167 0 : wpa_msg(wpa_s, MSG_INFO,
168 : "Failed to assign random MAC address for a scan");
169 0 : radio_work_done(work);
170 0 : return;
171 : }
172 :
173 2033 : wpa_supplicant_notify_scanning(wpa_s, 1);
174 :
175 2033 : if (wpa_s->clear_driver_scan_cache) {
176 1242 : wpa_printf(MSG_DEBUG,
177 : "Request driver to clear scan cache due to local BSS flush");
178 1242 : params->only_new_results = 1;
179 : }
180 2033 : ret = wpa_drv_scan(wpa_s, params);
181 2033 : wpa_scan_free_params(params);
182 2033 : work->ctx = NULL;
183 2033 : if (ret) {
184 3 : int retry = wpa_s->last_scan_req != MANUAL_SCAN_REQ;
185 :
186 3 : if (wpa_s->disconnected)
187 0 : retry = 0;
188 :
189 3 : wpa_supplicant_notify_scanning(wpa_s, 0);
190 3 : wpas_notify_scan_done(wpa_s, 0);
191 3 : if (wpa_s->wpa_state == WPA_SCANNING)
192 2 : wpa_supplicant_set_state(wpa_s,
193 : wpa_s->scan_prev_wpa_state);
194 3 : wpa_msg(wpa_s, MSG_INFO, WPA_EVENT_SCAN_FAILED "ret=%d%s",
195 : ret, retry ? " retry=1" : "");
196 3 : radio_work_done(work);
197 :
198 3 : if (retry) {
199 : /* Restore scan_req since we will try to scan again */
200 1 : wpa_s->scan_req = wpa_s->last_scan_req;
201 1 : wpa_supplicant_req_scan(wpa_s, 1, 0);
202 : }
203 3 : return;
204 : }
205 :
206 2030 : os_get_reltime(&wpa_s->scan_trigger_time);
207 2030 : wpa_s->scan_runs++;
208 2030 : wpa_s->normal_scans++;
209 2030 : wpa_s->own_scan_requested = 1;
210 2030 : wpa_s->clear_driver_scan_cache = 0;
211 2030 : 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 2035 : 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 2035 : if (wpa_s->scan_work) {
227 1 : wpa_dbg(wpa_s, MSG_INFO, "Reject scan trigger since one is already pending");
228 1 : return -1;
229 : }
230 :
231 2034 : ctx = wpa_scan_clone_params(params);
232 2034 : if (ctx == NULL)
233 1 : return -1;
234 :
235 2033 : if (radio_add_work(wpa_s, 0, "scan", 0, wpas_trigger_scan_cb, ctx) < 0)
236 : {
237 0 : wpa_scan_free_params(ctx);
238 0 : return -1;
239 : }
240 :
241 2033 : return 0;
242 : }
243 :
244 :
245 : static void
246 0 : wpa_supplicant_delayed_sched_scan_timeout(void *eloop_ctx, void *timeout_ctx)
247 : {
248 0 : struct wpa_supplicant *wpa_s = eloop_ctx;
249 :
250 0 : wpa_dbg(wpa_s, MSG_DEBUG, "Starting delayed sched scan");
251 :
252 0 : if (wpa_supplicant_req_sched_scan(wpa_s))
253 0 : wpa_supplicant_req_scan(wpa_s, 0, 0);
254 0 : }
255 :
256 :
257 : static void
258 0 : wpa_supplicant_sched_scan_timeout(void *eloop_ctx, void *timeout_ctx)
259 : {
260 0 : struct wpa_supplicant *wpa_s = eloop_ctx;
261 :
262 0 : wpa_dbg(wpa_s, MSG_DEBUG, "Sched scan timeout - stopping it");
263 :
264 0 : wpa_s->sched_scan_timed_out = 1;
265 0 : wpa_supplicant_cancel_sched_scan(wpa_s);
266 0 : }
267 :
268 :
269 0 : 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 0 : wpa_supplicant_notify_scanning(wpa_s, 1);
276 0 : ret = wpa_drv_sched_scan(wpa_s, params, interval * 1000);
277 0 : if (ret)
278 0 : wpa_supplicant_notify_scanning(wpa_s, 0);
279 : else
280 0 : wpa_s->sched_scanning = 1;
281 :
282 0 : return ret;
283 : }
284 :
285 :
286 0 : int wpa_supplicant_stop_sched_scan(struct wpa_supplicant *wpa_s)
287 : {
288 : int ret;
289 :
290 0 : ret = wpa_drv_stop_sched_scan(wpa_s);
291 0 : if (ret) {
292 0 : wpa_dbg(wpa_s, MSG_DEBUG, "stopping sched_scan failed!");
293 : /* TODO: what to do if stopping fails? */
294 0 : return -1;
295 : }
296 :
297 0 : return ret;
298 : }
299 :
300 :
301 : static struct wpa_driver_scan_filter *
302 2020 : 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 2020 : *num_ssids = 0;
309 2020 : if (!conf->filter_ssids)
310 2017 : return NULL;
311 :
312 7 : for (count = 0, ssid = conf->ssid; ssid; ssid = ssid->next) {
313 4 : if (ssid->ssid && ssid->ssid_len)
314 2 : count++;
315 : }
316 3 : if (count == 0)
317 1 : return NULL;
318 2 : ssids = os_calloc(count, sizeof(struct wpa_driver_scan_filter));
319 2 : if (ssids == NULL)
320 0 : return NULL;
321 :
322 5 : for (ssid = conf->ssid; ssid; ssid = ssid->next) {
323 3 : if (!ssid->ssid || !ssid->ssid_len)
324 1 : continue;
325 2 : os_memcpy(ssids[*num_ssids].ssid, ssid->ssid, ssid->ssid_len);
326 2 : ssids[*num_ssids].ssid_len = ssid->ssid_len;
327 2 : (*num_ssids)++;
328 : }
329 :
330 2 : return ssids;
331 : }
332 :
333 :
334 2020 : static void wpa_supplicant_optimize_freqs(
335 : struct wpa_supplicant *wpa_s, struct wpa_driver_scan_params *params)
336 : {
337 : #ifdef CONFIG_P2P
338 2266 : if (params->freqs == NULL && wpa_s->p2p_in_provisioning &&
339 246 : wpa_s->go_params) {
340 : /* Optimize provisioning state scan based on GO information */
341 488 : if (wpa_s->p2p_in_provisioning < 5 &&
342 242 : wpa_s->go_params->freq > 0) {
343 242 : wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only GO "
344 : "preferred frequency %d MHz",
345 : wpa_s->go_params->freq);
346 242 : params->freqs = os_calloc(2, sizeof(int));
347 484 : if (params->freqs)
348 242 : params->freqs[0] = wpa_s->go_params->freq;
349 8 : } else if (wpa_s->p2p_in_provisioning < 8 &&
350 4 : wpa_s->go_params->freq_list[0]) {
351 0 : wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only common "
352 : "channels");
353 0 : int_array_concat(¶ms->freqs,
354 0 : wpa_s->go_params->freq_list);
355 0 : if (params->freqs)
356 0 : int_array_sort_unique(params->freqs);
357 : }
358 246 : wpa_s->p2p_in_provisioning++;
359 : }
360 :
361 2020 : if (params->freqs == NULL && wpa_s->p2p_in_invitation) {
362 : /*
363 : * Optimize scan based on GO information during persistent
364 : * group reinvocation
365 : */
366 30 : if (wpa_s->p2p_in_invitation < 5 &&
367 15 : wpa_s->p2p_invite_go_freq > 0) {
368 12 : wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only GO preferred frequency %d MHz during invitation",
369 : wpa_s->p2p_invite_go_freq);
370 12 : params->freqs = os_calloc(2, sizeof(int));
371 12 : if (params->freqs)
372 12 : params->freqs[0] = wpa_s->p2p_invite_go_freq;
373 : }
374 15 : wpa_s->p2p_in_invitation++;
375 15 : 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 0 : wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Clear p2p_in_invitation");
383 0 : wpa_s->p2p_in_invitation = 0;
384 : }
385 : }
386 : #endif /* CONFIG_P2P */
387 :
388 : #ifdef CONFIG_WPS
389 2020 : 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 33 : wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Scan only frequency %u MHz "
395 : "that was used during provisioning", wpa_s->wps_freq);
396 33 : params->freqs = os_calloc(2, sizeof(int));
397 33 : if (params->freqs)
398 33 : params->freqs[0] = wpa_s->wps_freq;
399 33 : wpa_s->after_wps--;
400 1987 : } else if (wpa_s->after_wps)
401 1 : wpa_s->after_wps--;
402 :
403 2020 : if (params->freqs == NULL && wpa_s->known_wps_freq && wpa_s->wps_freq)
404 : {
405 : /* Optimize provisioning scan based on already known channel */
406 81 : wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Scan only frequency %u MHz",
407 : wpa_s->wps_freq);
408 81 : params->freqs = os_calloc(2, sizeof(int));
409 81 : if (params->freqs)
410 81 : params->freqs[0] = wpa_s->wps_freq;
411 81 : wpa_s->known_wps_freq = 0; /* only do this once */
412 : }
413 : #endif /* CONFIG_WPS */
414 2020 : }
415 :
416 :
417 : #ifdef CONFIG_INTERWORKING
418 673 : static void wpas_add_interworking_elements(struct wpa_supplicant *wpa_s,
419 : struct wpabuf *buf)
420 : {
421 673 : if (wpa_s->conf->interworking == 0)
422 673 : return;
423 :
424 673 : wpabuf_put_u8(buf, WLAN_EID_EXT_CAPAB);
425 673 : wpabuf_put_u8(buf, 6);
426 673 : wpabuf_put_u8(buf, 0x00);
427 673 : wpabuf_put_u8(buf, 0x00);
428 673 : wpabuf_put_u8(buf, 0x00);
429 673 : wpabuf_put_u8(buf, 0x80); /* Bit 31 - Interworking */
430 673 : wpabuf_put_u8(buf, 0x00);
431 : #ifdef CONFIG_HS20
432 673 : wpabuf_put_u8(buf, 0x40); /* Bit 46 - WNM-Notification */
433 : #else /* CONFIG_HS20 */
434 : wpabuf_put_u8(buf, 0x00);
435 : #endif /* CONFIG_HS20 */
436 :
437 673 : wpabuf_put_u8(buf, WLAN_EID_INTERWORKING);
438 673 : wpabuf_put_u8(buf, is_zero_ether_addr(wpa_s->conf->hessid) ? 1 :
439 : 1 + ETH_ALEN);
440 673 : wpabuf_put_u8(buf, wpa_s->conf->access_network_type);
441 : /* No Venue Info */
442 673 : if (!is_zero_ether_addr(wpa_s->conf->hessid))
443 4 : wpabuf_put_data(buf, wpa_s->conf->hessid, ETH_ALEN);
444 : }
445 : #endif /* CONFIG_INTERWORKING */
446 :
447 :
448 2020 : static struct wpabuf * wpa_supplicant_extra_ies(struct wpa_supplicant *wpa_s)
449 : {
450 2020 : struct wpabuf *extra_ie = NULL;
451 : #ifdef CONFIG_WPS
452 2020 : int wps = 0;
453 2020 : enum wps_request_type req_type = WPS_REQ_ENROLLEE_INFO;
454 : #endif /* CONFIG_WPS */
455 :
456 : #ifdef CONFIG_INTERWORKING
457 2693 : if (wpa_s->conf->interworking &&
458 673 : wpabuf_resize(&extra_ie, 100) == 0)
459 673 : wpas_add_interworking_elements(wpa_s, extra_ie);
460 : #endif /* CONFIG_INTERWORKING */
461 :
462 : #ifdef CONFIG_WPS
463 2020 : wps = wpas_wps_in_use(wpa_s, &req_type);
464 :
465 2020 : if (wps) {
466 : struct wpabuf *wps_ie;
467 4006 : wps_ie = wps_build_probe_req_ie(wps == 2 ? DEV_PW_PUSHBUTTON :
468 : DEV_PW_DEFAULT,
469 2003 : &wpa_s->wps->dev,
470 2003 : wpa_s->wps->uuid, req_type,
471 : 0, NULL);
472 2003 : if (wps_ie) {
473 2003 : if (wpabuf_resize(&extra_ie, wpabuf_len(wps_ie)) == 0)
474 2002 : wpabuf_put_buf(extra_ie, wps_ie);
475 2003 : wpabuf_free(wps_ie);
476 : }
477 : }
478 :
479 : #ifdef CONFIG_P2P
480 2020 : if (wps) {
481 2003 : size_t ielen = p2p_scan_ie_buf_len(wpa_s->global->p2p);
482 2003 : if (wpabuf_resize(&extra_ie, ielen) == 0)
483 2003 : wpas_p2p_scan_ie(wpa_s, extra_ie);
484 : }
485 : #endif /* CONFIG_P2P */
486 :
487 2020 : wpa_supplicant_mesh_add_scan_ie(wpa_s, &extra_ie);
488 :
489 : #endif /* CONFIG_WPS */
490 :
491 : #ifdef CONFIG_HS20
492 2020 : if (wpa_s->conf->hs20 && wpabuf_resize(&extra_ie, 7) == 0)
493 673 : wpas_hs20_add_indication(extra_ie, -1);
494 : #endif /* CONFIG_HS20 */
495 :
496 2020 : 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 42 : static int non_p2p_network_enabled(struct wpa_supplicant *wpa_s)
507 : {
508 : struct wpa_ssid *ssid;
509 :
510 44 : for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
511 44 : if (wpas_network_disabled(wpa_s, ssid))
512 2 : continue;
513 42 : if (!ssid->p2p_group)
514 42 : return 1;
515 : }
516 :
517 0 : if (wpa_s->conf->cred && wpa_s->conf->interworking &&
518 0 : wpa_s->conf->auto_interworking)
519 0 : return 1;
520 :
521 0 : return 0;
522 : }
523 :
524 : #endif /* CONFIG_P2P */
525 :
526 :
527 2 : 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 3 : for (i = 0; i < num_modes; i++) {
534 3 : if (modes[i].mode == mode)
535 2 : return &modes[i];
536 : }
537 :
538 0 : return NULL;
539 : }
540 :
541 :
542 2 : 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 2 : mode = get_mode(wpa_s->hw.modes, wpa_s->hw.num_modes, band);
551 2 : if (mode == NULL) {
552 : /* No channels supported in this band - use empty list */
553 0 : params->freqs = os_zalloc(sizeof(int));
554 0 : return;
555 : }
556 :
557 2 : params->freqs = os_calloc(mode->num_channels + 1, sizeof(int));
558 2 : if (params->freqs == NULL)
559 0 : return;
560 40 : for (count = 0, i = 0; i < mode->num_channels; i++) {
561 38 : if (mode->channels[i].flag & HOSTAPD_CHAN_DISABLED)
562 14 : continue;
563 24 : params->freqs[count++] = mode->channels[i].freq;
564 : }
565 : }
566 :
567 :
568 2020 : static void wpa_setband_scan_freqs(struct wpa_supplicant *wpa_s,
569 : struct wpa_driver_scan_params *params)
570 : {
571 2020 : if (wpa_s->hw.modes == NULL)
572 15 : return; /* unknown what channels the driver supports */
573 2005 : if (params->freqs)
574 1839 : return; /* already using a limited channel set */
575 166 : if (wpa_s->setband == WPA_SETBAND_5G)
576 1 : wpa_setband_scan_freqs_list(wpa_s, HOSTAPD_MODE_IEEE80211A,
577 : params);
578 165 : else if (wpa_s->setband == WPA_SETBAND_2G)
579 1 : wpa_setband_scan_freqs_list(wpa_s, HOSTAPD_MODE_IEEE80211G,
580 : params);
581 : }
582 :
583 :
584 2 : 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 6 : for (i = 0; i < wpa_s->scan_id_count; i++) {
592 : unsigned int j;
593 :
594 4 : ssid = wpa_config_get_network(wpa_s->conf, wpa_s->scan_id[i]);
595 4 : if (!ssid || !ssid->scan_ssid)
596 1 : continue;
597 :
598 4 : for (j = 0; j < params->num_ssids; j++) {
599 1 : if (params->ssids[j].ssid_len == ssid->ssid_len &&
600 0 : params->ssids[j].ssid &&
601 0 : os_memcmp(params->ssids[j].ssid, ssid->ssid,
602 : ssid->ssid_len) == 0)
603 0 : break;
604 : }
605 3 : if (j < params->num_ssids)
606 0 : continue; /* already in the list */
607 :
608 3 : if (params->num_ssids + 1 > max_ssids) {
609 0 : wpa_printf(MSG_DEBUG,
610 : "Over max scan SSIDs for manual request");
611 0 : break;
612 : }
613 :
614 6 : wpa_printf(MSG_DEBUG, "Scan SSID (manual request): %s",
615 3 : wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
616 3 : params->ssids[params->num_ssids].ssid = ssid->ssid;
617 3 : params->ssids[params->num_ssids].ssid_len = ssid->ssid_len;
618 3 : params->num_ssids++;
619 : }
620 :
621 2 : wpa_s->scan_id_count = 0;
622 2 : }
623 :
624 :
625 3047 : static void wpa_supplicant_scan(void *eloop_ctx, void *timeout_ctx)
626 : {
627 3047 : struct wpa_supplicant *wpa_s = eloop_ctx;
628 : struct wpa_ssid *ssid;
629 : int ret, p2p_in_prog;
630 3047 : 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 3047 : int connect_without_scan = 0;
635 :
636 3047 : if (wpa_s->pno || wpa_s->pno_sched_pending) {
637 0 : wpa_dbg(wpa_s, MSG_DEBUG, "Skip scan - PNO is in progress");
638 0 : return;
639 : }
640 :
641 3047 : if (wpa_s->wpa_state == WPA_INTERFACE_DISABLED) {
642 0 : wpa_dbg(wpa_s, MSG_DEBUG, "Skip scan - interface disabled");
643 0 : return;
644 : }
645 :
646 3047 : if (wpa_s->disconnected && wpa_s->scan_req == NORMAL_SCAN_REQ) {
647 0 : wpa_dbg(wpa_s, MSG_DEBUG, "Disconnected - do not scan");
648 0 : wpa_supplicant_set_state(wpa_s, WPA_DISCONNECTED);
649 0 : return;
650 : }
651 :
652 3047 : if (wpa_s->scanning) {
653 : /*
654 : * If we are already in scanning state, we shall reschedule the
655 : * the incoming scan request.
656 : */
657 0 : wpa_dbg(wpa_s, MSG_DEBUG, "Already scanning - Reschedule the incoming scan req");
658 0 : wpa_supplicant_req_scan(wpa_s, 1, 0);
659 0 : return;
660 : }
661 :
662 4206 : if (!wpa_supplicant_enabled_networks(wpa_s) &&
663 1159 : wpa_s->scan_req == NORMAL_SCAN_REQ) {
664 678 : wpa_dbg(wpa_s, MSG_DEBUG, "No enabled networks - do not scan");
665 678 : wpa_supplicant_set_state(wpa_s, WPA_INACTIVE);
666 678 : return;
667 : }
668 :
669 4736 : if (wpa_s->conf->ap_scan != 0 &&
670 2367 : (wpa_s->drv_flags & WPA_DRIVER_FLAGS_WIRED)) {
671 0 : wpa_dbg(wpa_s, MSG_DEBUG, "Using wired authentication - "
672 : "overriding ap_scan configuration");
673 0 : wpa_s->conf->ap_scan = 0;
674 0 : wpas_notify_ap_scan_changed(wpa_s);
675 : }
676 :
677 2369 : if (wpa_s->conf->ap_scan == 0) {
678 2 : wpa_supplicant_gen_assoc_event(wpa_s);
679 2 : return;
680 : }
681 :
682 2367 : ssid = NULL;
683 4077 : if (wpa_s->scan_req != MANUAL_SCAN_REQ &&
684 1710 : wpa_s->connect_without_scan) {
685 332 : connect_without_scan = 1;
686 364 : for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
687 364 : if (ssid == wpa_s->connect_without_scan)
688 332 : break;
689 : }
690 : }
691 :
692 2367 : p2p_in_prog = wpas_p2p_in_progress(wpa_s);
693 2367 : if (p2p_in_prog && p2p_in_prog != 2 &&
694 62 : (!ssid ||
695 124 : (ssid->mode != WPAS_MODE_AP && ssid->mode != WPAS_MODE_P2P_GO))) {
696 1 : wpa_dbg(wpa_s, MSG_DEBUG, "Delay station mode scan while P2P operation is in progress");
697 1 : wpa_supplicant_req_scan(wpa_s, 5, 0);
698 1 : return;
699 : }
700 :
701 2366 : if (wpa_s->conf->ap_scan == 2)
702 16 : max_ssids = 1;
703 : else {
704 2350 : max_ssids = wpa_s->max_scan_ssids;
705 2350 : if (max_ssids > WPAS_MAX_SCAN_SSIDS)
706 15 : max_ssids = WPAS_MAX_SCAN_SSIDS;
707 : }
708 :
709 2366 : wpa_s->last_scan_req = wpa_s->scan_req;
710 2366 : wpa_s->scan_req = NORMAL_SCAN_REQ;
711 :
712 2366 : if (connect_without_scan) {
713 332 : wpa_s->connect_without_scan = NULL;
714 332 : if (ssid) {
715 332 : wpa_printf(MSG_DEBUG, "Start a pre-selected network "
716 : "without scan step");
717 332 : wpa_supplicant_associate(wpa_s, NULL, ssid);
718 332 : return;
719 : }
720 : }
721 :
722 2034 : os_memset(¶ms, 0, sizeof(params));
723 :
724 2034 : wpa_s->scan_prev_wpa_state = wpa_s->wpa_state;
725 3209 : if (wpa_s->wpa_state == WPA_DISCONNECTED ||
726 1175 : wpa_s->wpa_state == WPA_INACTIVE)
727 1582 : wpa_supplicant_set_state(wpa_s, WPA_SCANNING);
728 :
729 : /*
730 : * If autoscan has set its own scanning parameters
731 : */
732 2034 : if (wpa_s->autoscan_params != NULL) {
733 0 : scan_params = wpa_s->autoscan_params;
734 0 : goto scan;
735 : }
736 :
737 : #ifdef CONFIG_P2P
738 2295 : if ((wpa_s->p2p_in_provisioning || wpa_s->show_group_started) &&
739 507 : wpa_s->go_params && !wpa_s->conf->passive_scan) {
740 239 : 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);
743 239 : params.ssids[0].ssid = wpa_s->go_params->ssid;
744 239 : params.ssids[0].ssid_len = wpa_s->go_params->ssid_len;
745 239 : params.num_ssids = 1;
746 239 : goto ssid_list_set;
747 : }
748 :
749 1795 : if (wpa_s->p2p_in_invitation) {
750 15 : if (wpa_s->current_ssid) {
751 5 : wpa_printf(MSG_DEBUG, "P2P: Use specific SSID for scan during invitation");
752 5 : params.ssids[0].ssid = wpa_s->current_ssid->ssid;
753 5 : params.ssids[0].ssid_len =
754 5 : wpa_s->current_ssid->ssid_len;
755 5 : params.num_ssids = 1;
756 : } else {
757 10 : wpa_printf(MSG_DEBUG, "P2P: No specific SSID known for scan during invitation");
758 : }
759 15 : goto ssid_list_set;
760 : }
761 : #endif /* CONFIG_P2P */
762 :
763 : /* Find the starting point from which to continue scanning */
764 1780 : ssid = wpa_s->conf->ssid;
765 1780 : if (wpa_s->prev_scan_ssid != WILDCARD_SSID_SCAN) {
766 12 : while (ssid) {
767 6 : if (ssid == wpa_s->prev_scan_ssid) {
768 4 : ssid = ssid->next;
769 4 : break;
770 : }
771 2 : ssid = ssid->next;
772 : }
773 : }
774 :
775 2904 : if (wpa_s->last_scan_req != MANUAL_SCAN_REQ &&
776 1124 : wpa_s->conf->ap_scan == 2) {
777 14 : wpa_s->connect_without_scan = NULL;
778 14 : wpa_s->prev_scan_wildcard = 0;
779 14 : wpa_supplicant_assoc_try(wpa_s, ssid);
780 14 : return;
781 1766 : } 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 2 : ssid = NULL;
787 1764 : } 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 1 : ssid = wpa_s->current_ssid;
794 2 : wpa_hexdump_ascii(MSG_DEBUG, "Scan SSID",
795 1 : ssid->ssid, ssid->ssid_len);
796 1 : params.ssids[0].ssid = ssid->ssid;
797 1 : params.ssids[0].ssid_len = ssid->ssid_len;
798 1 : params.num_ssids = 1;
799 :
800 : /*
801 : * Allocate memory for frequency array, allocate one extra
802 : * slot for the zero-terminator.
803 : */
804 1 : params.freqs = os_malloc(sizeof(int) * 2);
805 1 : if (params.freqs == NULL) {
806 0 : wpa_dbg(wpa_s, MSG_ERROR, "Memory allocation failed");
807 0 : return;
808 : }
809 1 : params.freqs[0] = wpa_s->assoc_freq;
810 1 : 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 1 : wpa_s->reattach = 0;
817 : } else {
818 1763 : struct wpa_ssid *start = ssid, *tssid;
819 1763 : int freqs_set = 0;
820 1763 : if (ssid == NULL && max_ssids > 1)
821 467 : ssid = wpa_s->conf->ssid;
822 4862 : while (ssid) {
823 2630 : if (!wpas_network_disabled(wpa_s, ssid) &&
824 1289 : ssid->scan_ssid) {
825 28 : wpa_hexdump_ascii(MSG_DEBUG, "Scan SSID",
826 14 : ssid->ssid, ssid->ssid_len);
827 28 : params.ssids[params.num_ssids].ssid =
828 14 : ssid->ssid;
829 28 : params.ssids[params.num_ssids].ssid_len =
830 14 : ssid->ssid_len;
831 14 : params.num_ssids++;
832 14 : if (params.num_ssids + 1 >= max_ssids)
833 4 : break;
834 : }
835 1337 : ssid = ssid->next;
836 1337 : if (ssid == start)
837 1 : break;
838 2615 : if (ssid == NULL && max_ssids > 1 &&
839 1279 : start != wpa_s->conf->ssid)
840 0 : ssid = wpa_s->conf->ssid;
841 : }
842 :
843 1765 : if (wpa_s->scan_id_count &&
844 2 : wpa_s->last_scan_req == MANUAL_SCAN_REQ)
845 2 : wpa_set_scan_ssids(wpa_s, ¶ms, max_ssids);
846 :
847 4681 : for (tssid = wpa_s->conf->ssid;
848 5182 : wpa_s->last_scan_req != MANUAL_SCAN_REQ && tssid;
849 1155 : tssid = tssid->next) {
850 1155 : if (wpas_network_disabled(wpa_s, tssid))
851 30 : continue;
852 1125 : if ((params.freqs || !freqs_set) && tssid->scan_freq) {
853 875 : int_array_concat(¶ms.freqs,
854 875 : tssid->scan_freq);
855 : } else {
856 250 : os_free(params.freqs);
857 250 : params.freqs = NULL;
858 : }
859 1125 : freqs_set = 1;
860 : }
861 1763 : int_array_sort_unique(params.freqs);
862 : }
863 :
864 1766 : 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 4 : if (!wpa_s->prev_scan_wildcard) {
871 1 : params.ssids[0].ssid = NULL;
872 1 : params.ssids[0].ssid_len = 0;
873 1 : wpa_s->prev_scan_wildcard = 1;
874 1 : wpa_dbg(wpa_s, MSG_DEBUG, "Starting AP scan for "
875 : "wildcard SSID (Interleave with specific)");
876 : } else {
877 1 : wpa_s->prev_scan_ssid = ssid;
878 1 : wpa_s->prev_scan_wildcard = 0;
879 1 : 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 1764 : } else if (ssid) {
884 : /* max_ssids > 1 */
885 :
886 3 : wpa_s->prev_scan_ssid = ssid;
887 3 : wpa_dbg(wpa_s, MSG_DEBUG, "Include wildcard SSID in "
888 : "the scan request");
889 3 : params.num_ssids++;
890 1761 : } else if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
891 2 : wpa_s->manual_scan_passive && params.num_ssids == 0) {
892 2 : wpa_dbg(wpa_s, MSG_DEBUG, "Use passive scan based on manual request");
893 1759 : } else if (wpa_s->conf->passive_scan) {
894 7 : wpa_dbg(wpa_s, MSG_DEBUG,
895 : "Use passive scan based on configuration");
896 : } else {
897 1752 : wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
898 1752 : params.num_ssids++;
899 1752 : 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 2020 : wpa_supplicant_optimize_freqs(wpa_s, ¶ms);
907 2020 : extra_ie = wpa_supplicant_extra_ies(wpa_s);
908 :
909 2020 : if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
910 : wpa_s->manual_scan_only_new) {
911 165 : wpa_printf(MSG_DEBUG,
912 : "Request driver to clear scan cache due to manual only_new=1 scan");
913 165 : params.only_new_results = 1;
914 : }
915 :
916 2675 : if (wpa_s->last_scan_req == MANUAL_SCAN_REQ && params.freqs == NULL &&
917 655 : wpa_s->manual_scan_freqs) {
918 619 : wpa_dbg(wpa_s, MSG_DEBUG, "Limit manual scan to specified channels");
919 619 : params.freqs = wpa_s->manual_scan_freqs;
920 619 : wpa_s->manual_scan_freqs = NULL;
921 : }
922 :
923 2020 : if (params.freqs == NULL && wpa_s->next_scan_freqs) {
924 2 : wpa_dbg(wpa_s, MSG_DEBUG, "Optimize scan based on previously "
925 : "generated frequency list");
926 2 : params.freqs = wpa_s->next_scan_freqs;
927 : } else
928 2018 : os_free(wpa_s->next_scan_freqs);
929 2020 : wpa_s->next_scan_freqs = NULL;
930 2020 : wpa_setband_scan_freqs(wpa_s, ¶ms);
931 :
932 : /* See if user specified frequencies. If so, scan only those. */
933 2020 : if (wpa_s->conf->freq_list && !params.freqs) {
934 0 : wpa_dbg(wpa_s, MSG_DEBUG,
935 : "Optimize scan based on conf->freq_list");
936 0 : int_array_concat(¶ms.freqs, wpa_s->conf->freq_list);
937 : }
938 :
939 : /* Use current associated channel? */
940 2020 : if (wpa_s->conf->scan_cur_freq && !params.freqs) {
941 0 : unsigned int num = wpa_s->num_multichan_concurrent;
942 :
943 0 : params.freqs = os_calloc(num + 1, sizeof(int));
944 0 : if (params.freqs) {
945 0 : num = get_shared_radio_freqs(wpa_s, params.freqs, num);
946 0 : if (num > 0) {
947 0 : wpa_dbg(wpa_s, MSG_DEBUG, "Scan only the "
948 : "current operating channels since "
949 : "scan_cur_freq is enabled");
950 : } else {
951 0 : os_free(params.freqs);
952 0 : params.freqs = NULL;
953 : }
954 : }
955 : }
956 :
957 2020 : params.filter_ssids = wpa_supplicant_build_filter_ssids(
958 : wpa_s->conf, ¶ms.num_filter_ssids);
959 2020 : if (extra_ie) {
960 2020 : params.extra_ies = wpabuf_head(extra_ie);
961 2020 : params.extra_ies_len = wpabuf_len(extra_ie);
962 : }
963 :
964 : #ifdef CONFIG_P2P
965 3779 : if (wpa_s->p2p_in_provisioning || wpa_s->p2p_in_invitation ||
966 1759 : (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 : */
971 261 : params.p2p_probe = 1;
972 : }
973 : #endif /* CONFIG_P2P */
974 :
975 2020 : if (wpa_s->mac_addr_rand_enable & MAC_ADDR_RAND_SCAN) {
976 3 : params.mac_addr_rand = 1;
977 3 : if (wpa_s->mac_addr_scan) {
978 2 : params.mac_addr = wpa_s->mac_addr_scan;
979 2 : params.mac_addr_mask = wpa_s->mac_addr_scan + ETH_ALEN;
980 : }
981 : }
982 :
983 2020 : scan_params = ¶ms;
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 2225 : if (wpa_s->scan_for_connection &&
997 381 : wpa_s->last_scan_req == NORMAL_SCAN_REQ &&
998 262 : !scan_params->freqs && !params.freqs &&
999 86 : wpas_is_p2p_prioritized(wpa_s) &&
1000 85 : wpa_s->p2p_group_interface == NOT_P2P_GROUP_INTERFACE &&
1001 42 : non_p2p_network_enabled(wpa_s)) {
1002 42 : unsigned int num = wpa_s->num_multichan_concurrent;
1003 :
1004 42 : params.freqs = os_calloc(num + 1, sizeof(int));
1005 42 : if (params.freqs) {
1006 42 : num = get_shared_radio_freqs(wpa_s, params.freqs, num);
1007 42 : if (num > 0 && num == wpa_s->num_multichan_concurrent) {
1008 0 : wpa_dbg(wpa_s, MSG_DEBUG, "Scan only the current operating channels since all channels are already used");
1009 : } else {
1010 42 : os_free(params.freqs);
1011 42 : params.freqs = NULL;
1012 : }
1013 : }
1014 : }
1015 : #endif /* CONFIG_P2P */
1016 :
1017 2020 : ret = wpa_supplicant_trigger_scan(wpa_s, scan_params);
1018 :
1019 2020 : if (ret && wpa_s->last_scan_req == MANUAL_SCAN_REQ && params.freqs &&
1020 0 : !wpa_s->manual_scan_freqs) {
1021 : /* Restore manual_scan_freqs for the next attempt */
1022 0 : wpa_s->manual_scan_freqs = params.freqs;
1023 0 : params.freqs = NULL;
1024 : }
1025 :
1026 2020 : wpabuf_free(extra_ie);
1027 2020 : os_free(params.freqs);
1028 2020 : os_free(params.filter_ssids);
1029 :
1030 2020 : if (ret) {
1031 0 : wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate AP scan");
1032 0 : if (wpa_s->scan_prev_wpa_state != wpa_s->wpa_state)
1033 0 : 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 0 : wpa_s->scan_req = wpa_s->last_scan_req;
1037 0 : wpa_supplicant_req_scan(wpa_s, 1, 0);
1038 : } else {
1039 2020 : wpa_s->scan_for_connection = 0;
1040 : #ifdef CONFIG_INTERWORKING
1041 2020 : wpa_s->interworking_fast_assoc_tried = 0;
1042 : #endif /* CONFIG_INTERWORKING */
1043 : }
1044 : }
1045 :
1046 :
1047 19 : 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 19 : cancelled = eloop_cancel_timeout_one(wpa_supplicant_scan, wpa_s, NULL,
1053 : &remaining);
1054 :
1055 19 : new_int.sec = sec;
1056 19 : new_int.usec = 0;
1057 19 : if (cancelled && os_reltime_before(&remaining, &new_int)) {
1058 6 : new_int.sec = remaining.sec;
1059 6 : new_int.usec = remaining.usec;
1060 : }
1061 :
1062 19 : if (cancelled) {
1063 6 : eloop_register_timeout(new_int.sec, new_int.usec,
1064 : wpa_supplicant_scan, wpa_s, NULL);
1065 : }
1066 19 : wpa_s->scan_interval = sec;
1067 19 : }
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 4417 : void wpa_supplicant_req_scan(struct wpa_supplicant *wpa_s, int sec, int usec)
1080 : {
1081 : int res;
1082 :
1083 4417 : if (wpa_s->p2p_mgmt) {
1084 2 : wpa_dbg(wpa_s, MSG_DEBUG,
1085 : "Ignore scan request (%d.%06d sec) on p2p_mgmt interface",
1086 : sec, usec);
1087 4419 : return;
1088 : }
1089 :
1090 4415 : res = eloop_deplete_timeout(sec, usec, wpa_supplicant_scan, wpa_s,
1091 : NULL);
1092 4415 : if (res == 1) {
1093 106 : wpa_dbg(wpa_s, MSG_DEBUG, "Rescheduling scan request: %d.%06d sec",
1094 : sec, usec);
1095 4309 : } else if (res == 0) {
1096 310 : 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 3999 : wpa_dbg(wpa_s, MSG_DEBUG, "Setting scan request: %d.%06d sec",
1100 : sec, usec);
1101 3999 : 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 0 : int wpa_supplicant_delayed_sched_scan(struct wpa_supplicant *wpa_s,
1117 : int sec, int usec)
1118 : {
1119 0 : if (!wpa_s->sched_scan_supported)
1120 0 : return -1;
1121 :
1122 0 : eloop_register_timeout(sec, usec,
1123 : wpa_supplicant_delayed_sched_scan_timeout,
1124 : wpa_s, NULL);
1125 :
1126 0 : 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 216 : 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 216 : struct wpa_ssid *ssid = NULL;
1144 216 : struct wpabuf *extra_ie = NULL;
1145 : int ret;
1146 : unsigned int max_sched_scan_ssids;
1147 216 : int wildcard = 0;
1148 : int need_ssids;
1149 :
1150 216 : if (!wpa_s->sched_scan_supported)
1151 216 : return -1;
1152 :
1153 0 : if (wpa_s->max_sched_scan_ssids > WPAS_MAX_SCAN_SSIDS)
1154 0 : max_sched_scan_ssids = WPAS_MAX_SCAN_SSIDS;
1155 : else
1156 0 : max_sched_scan_ssids = wpa_s->max_sched_scan_ssids;
1157 0 : if (max_sched_scan_ssids < 1 || wpa_s->conf->disable_scan_offload)
1158 0 : return -1;
1159 :
1160 0 : if (wpa_s->sched_scanning) {
1161 0 : wpa_dbg(wpa_s, MSG_DEBUG, "Already sched scanning");
1162 0 : return 0;
1163 : }
1164 :
1165 0 : need_ssids = 0;
1166 0 : for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
1167 0 : if (!wpas_network_disabled(wpa_s, ssid) && !ssid->scan_ssid) {
1168 : /* Use wildcard SSID to find this network */
1169 0 : wildcard = 1;
1170 0 : } else if (!wpas_network_disabled(wpa_s, ssid) &&
1171 0 : ssid->ssid_len)
1172 0 : need_ssids++;
1173 :
1174 : #ifdef CONFIG_WPS
1175 0 : if (!wpas_network_disabled(wpa_s, ssid) &&
1176 0 : 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 0 : wpa_dbg(wpa_s, MSG_DEBUG, "Use normal scan instead of "
1184 : "sched_scan for WPS");
1185 0 : return -1;
1186 : }
1187 : #endif /* CONFIG_WPS */
1188 : }
1189 0 : if (wildcard)
1190 0 : need_ssids++;
1191 :
1192 0 : if (wpa_s->normal_scans < 3 &&
1193 0 : (need_ssids <= wpa_s->max_scan_ssids ||
1194 0 : 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 0 : 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 0 : return -1;
1206 : }
1207 :
1208 0 : os_memset(¶ms, 0, sizeof(params));
1209 :
1210 : /* If we can't allocate space for the filters, we just don't filter */
1211 0 : params.filter_ssids = os_calloc(wpa_s->max_match_sets,
1212 : sizeof(struct wpa_driver_scan_filter));
1213 :
1214 0 : prev_state = wpa_s->wpa_state;
1215 0 : if (wpa_s->wpa_state == WPA_DISCONNECTED ||
1216 0 : wpa_s->wpa_state == WPA_INACTIVE)
1217 0 : wpa_supplicant_set_state(wpa_s, WPA_SCANNING);
1218 :
1219 0 : if (wpa_s->autoscan_params != NULL) {
1220 0 : scan_params = wpa_s->autoscan_params;
1221 0 : goto scan;
1222 : }
1223 :
1224 : /* Find the starting point from which to continue scanning */
1225 0 : ssid = wpa_s->conf->ssid;
1226 0 : if (wpa_s->prev_sched_ssid) {
1227 0 : while (ssid) {
1228 0 : if (ssid == wpa_s->prev_sched_ssid) {
1229 0 : ssid = ssid->next;
1230 0 : break;
1231 : }
1232 0 : ssid = ssid->next;
1233 : }
1234 : }
1235 :
1236 0 : if (!ssid || !wpa_s->prev_sched_ssid) {
1237 0 : wpa_dbg(wpa_s, MSG_DEBUG, "Beginning of SSID list");
1238 0 : if (wpa_s->conf->sched_scan_interval)
1239 0 : wpa_s->sched_scan_interval =
1240 0 : wpa_s->conf->sched_scan_interval;
1241 0 : if (wpa_s->sched_scan_interval == 0)
1242 0 : wpa_s->sched_scan_interval = 10;
1243 0 : wpa_s->sched_scan_timeout = max_sched_scan_ssids * 2;
1244 0 : wpa_s->first_sched_scan = 1;
1245 0 : ssid = wpa_s->conf->ssid;
1246 0 : wpa_s->prev_sched_ssid = ssid;
1247 : }
1248 :
1249 0 : if (wildcard) {
1250 0 : wpa_dbg(wpa_s, MSG_DEBUG, "Add wildcard SSID to sched_scan");
1251 0 : params.num_ssids++;
1252 : }
1253 :
1254 0 : while (ssid) {
1255 0 : if (wpas_network_disabled(wpa_s, ssid))
1256 0 : goto next;
1257 :
1258 0 : if (params.num_filter_ssids < wpa_s->max_match_sets &&
1259 0 : params.filter_ssids && ssid->ssid && ssid->ssid_len) {
1260 0 : wpa_dbg(wpa_s, MSG_DEBUG, "add to filter ssid: %s",
1261 : wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
1262 0 : os_memcpy(params.filter_ssids[params.num_filter_ssids].ssid,
1263 : ssid->ssid, ssid->ssid_len);
1264 0 : params.filter_ssids[params.num_filter_ssids].ssid_len =
1265 0 : ssid->ssid_len;
1266 0 : params.num_filter_ssids++;
1267 0 : } else if (params.filter_ssids && ssid->ssid && ssid->ssid_len)
1268 : {
1269 0 : wpa_dbg(wpa_s, MSG_DEBUG, "Not enough room for SSID "
1270 : "filter for sched_scan - drop filter");
1271 0 : os_free(params.filter_ssids);
1272 0 : params.filter_ssids = NULL;
1273 0 : params.num_filter_ssids = 0;
1274 : }
1275 :
1276 0 : if (ssid->scan_ssid && ssid->ssid && ssid->ssid_len) {
1277 0 : if (params.num_ssids == max_sched_scan_ssids)
1278 0 : break; /* only room for broadcast SSID */
1279 0 : wpa_dbg(wpa_s, MSG_DEBUG,
1280 : "add to active scan ssid: %s",
1281 : wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
1282 0 : params.ssids[params.num_ssids].ssid =
1283 0 : ssid->ssid;
1284 0 : params.ssids[params.num_ssids].ssid_len =
1285 0 : ssid->ssid_len;
1286 0 : params.num_ssids++;
1287 0 : if (params.num_ssids >= max_sched_scan_ssids) {
1288 0 : wpa_s->prev_sched_ssid = ssid;
1289 : do {
1290 0 : ssid = ssid->next;
1291 0 : } while (ssid &&
1292 0 : (wpas_network_disabled(wpa_s, ssid) ||
1293 0 : !ssid->scan_ssid));
1294 0 : break;
1295 : }
1296 : }
1297 :
1298 : next:
1299 0 : wpa_s->prev_sched_ssid = ssid;
1300 0 : ssid = ssid->next;
1301 : }
1302 :
1303 0 : if (params.num_filter_ssids == 0) {
1304 0 : os_free(params.filter_ssids);
1305 0 : params.filter_ssids = NULL;
1306 : }
1307 :
1308 0 : extra_ie = wpa_supplicant_extra_ies(wpa_s);
1309 0 : if (extra_ie) {
1310 0 : params.extra_ies = wpabuf_head(extra_ie);
1311 0 : params.extra_ies_len = wpabuf_len(extra_ie);
1312 : }
1313 :
1314 0 : if (wpa_s->conf->filter_rssi)
1315 0 : params.filter_rssi = wpa_s->conf->filter_rssi;
1316 :
1317 : /* See if user specified frequencies. If so, scan only those. */
1318 0 : if (wpa_s->conf->freq_list && !params.freqs) {
1319 0 : wpa_dbg(wpa_s, MSG_DEBUG,
1320 : "Optimize scan based on conf->freq_list");
1321 0 : int_array_concat(¶ms.freqs, wpa_s->conf->freq_list);
1322 : }
1323 :
1324 0 : scan_params = ¶ms;
1325 :
1326 : scan:
1327 0 : if (ssid || !wpa_s->first_sched_scan) {
1328 0 : 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 0 : wpa_dbg(wpa_s, MSG_DEBUG,
1333 : "Starting sched scan: interval %d (no timeout)",
1334 : wpa_s->sched_scan_interval);
1335 : }
1336 :
1337 0 : wpa_setband_scan_freqs(wpa_s, scan_params);
1338 :
1339 0 : if (wpa_s->mac_addr_rand_enable & MAC_ADDR_RAND_SCHED_SCAN) {
1340 0 : params.mac_addr_rand = 1;
1341 0 : if (wpa_s->mac_addr_sched_scan) {
1342 0 : params.mac_addr = wpa_s->mac_addr_sched_scan;
1343 0 : params.mac_addr_mask = wpa_s->mac_addr_sched_scan +
1344 : ETH_ALEN;
1345 : }
1346 : }
1347 :
1348 0 : ret = wpa_supplicant_start_sched_scan(wpa_s, scan_params,
1349 : wpa_s->sched_scan_interval);
1350 0 : wpabuf_free(extra_ie);
1351 0 : os_free(params.filter_ssids);
1352 0 : if (ret) {
1353 0 : wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate sched scan");
1354 0 : if (prev_state != wpa_s->wpa_state)
1355 0 : wpa_supplicant_set_state(wpa_s, prev_state);
1356 0 : return ret;
1357 : }
1358 :
1359 : /* If we have more SSIDs to scan, add a timeout so we scan them too */
1360 0 : if (ssid || !wpa_s->first_sched_scan) {
1361 0 : wpa_s->sched_scan_timed_out = 0;
1362 0 : eloop_register_timeout(wpa_s->sched_scan_timeout, 0,
1363 : wpa_supplicant_sched_scan_timeout,
1364 : wpa_s, NULL);
1365 0 : wpa_s->first_sched_scan = 0;
1366 0 : wpa_s->sched_scan_timeout /= 2;
1367 0 : wpa_s->sched_scan_interval *= 2;
1368 0 : if (wpa_s->sched_scan_timeout < wpa_s->sched_scan_interval) {
1369 0 : wpa_s->sched_scan_interval = 10;
1370 0 : 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 0 : if (!ssid)
1376 0 : wpa_s->prev_sched_ssid = NULL;
1377 :
1378 0 : 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 7354 : void wpa_supplicant_cancel_scan(struct wpa_supplicant *wpa_s)
1390 : {
1391 7354 : wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling scan request");
1392 7354 : eloop_cancel_timeout(wpa_supplicant_scan, wpa_s, NULL);
1393 7354 : }
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 288 : void wpa_supplicant_cancel_delayed_sched_scan(struct wpa_supplicant *wpa_s)
1403 : {
1404 288 : if (!wpa_s->sched_scan_supported)
1405 576 : return;
1406 :
1407 0 : wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling delayed sched scan");
1408 0 : 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 5139 : void wpa_supplicant_cancel_sched_scan(struct wpa_supplicant *wpa_s)
1420 : {
1421 5139 : if (!wpa_s->sched_scanning)
1422 10278 : return;
1423 :
1424 0 : wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling sched scan");
1425 0 : eloop_cancel_timeout(wpa_supplicant_sched_scan_timeout, wpa_s, NULL);
1426 0 : 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 25991 : void wpa_supplicant_notify_scanning(struct wpa_supplicant *wpa_s,
1441 : int scanning)
1442 : {
1443 25991 : if (wpa_s->scanning != scanning) {
1444 4066 : wpa_s->scanning = scanning;
1445 4066 : wpas_notify_scanning(wpa_s);
1446 : }
1447 25991 : }
1448 :
1449 :
1450 3936 : static int wpa_scan_get_max_rate(const struct wpa_scan_res *res)
1451 : {
1452 3936 : int rate = 0;
1453 : const u8 *ie;
1454 : int i;
1455 :
1456 3936 : ie = wpa_scan_get_ie(res, WLAN_EID_SUPP_RATES);
1457 35413 : for (i = 0; ie && i < ie[1]; i++) {
1458 31477 : if ((ie[i + 2] & 0x7f) > rate)
1459 26873 : rate = ie[i + 2] & 0x7f;
1460 : }
1461 :
1462 3936 : ie = wpa_scan_get_ie(res, WLAN_EID_EXT_SUPP_RATES);
1463 13152 : for (i = 0; ie && i < ie[1]; i++) {
1464 9216 : if ((ie[i + 2] & 0x7f) > rate)
1465 9216 : rate = ie[i + 2] & 0x7f;
1466 : }
1467 :
1468 3936 : 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 29392 : const u8 * wpa_scan_get_ie(const struct wpa_scan_res *res, u8 ie)
1482 : {
1483 : const u8 *end, *pos;
1484 :
1485 29392 : pos = (const u8 *) (res + 1);
1486 29392 : end = pos + res->ie_len;
1487 :
1488 212977 : while (pos + 1 < end) {
1489 171302 : if (pos + 2 + pos[1] > end)
1490 0 : break;
1491 171302 : if (pos[0] == ie)
1492 17109 : return pos;
1493 154193 : pos += 2 + pos[1];
1494 : }
1495 :
1496 12283 : 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 9415 : 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 9415 : pos = (const u8 *) (res + 1);
1515 9415 : end = pos + res->ie_len;
1516 :
1517 101846 : while (pos + 1 < end) {
1518 85914 : if (pos + 2 + pos[1] > end)
1519 0 : break;
1520 102384 : if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1521 16470 : vendor_type == WPA_GET_BE32(&pos[2]))
1522 2898 : return pos;
1523 83016 : pos += 2 + pos[1];
1524 : }
1525 :
1526 6517 : 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 323 : 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 323 : if (res->beacon_ie_len == 0)
1548 0 : return NULL;
1549 :
1550 323 : pos = (const u8 *) (res + 1);
1551 323 : pos += res->ie_len;
1552 323 : end = pos + res->beacon_ie_len;
1553 :
1554 4050 : while (pos + 1 < end) {
1555 3423 : if (pos + 2 + pos[1] > end)
1556 0 : break;
1557 3826 : if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1558 403 : vendor_type == WPA_GET_BE32(&pos[2]))
1559 19 : return pos;
1560 3404 : pos += 2 + pos[1];
1561 : }
1562 :
1563 304 : 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 788 : 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 788 : buf = wpabuf_alloc(res->ie_len);
1584 788 : if (buf == NULL)
1585 0 : return NULL;
1586 :
1587 788 : pos = (const u8 *) (res + 1);
1588 788 : end = pos + res->ie_len;
1589 :
1590 9689 : while (pos + 1 < end) {
1591 8113 : if (pos + 2 + pos[1] > end)
1592 0 : break;
1593 10073 : if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1594 1960 : vendor_type == WPA_GET_BE32(&pos[2]))
1595 772 : wpabuf_put_data(buf, pos + 2 + 4, pos[1] - 4);
1596 8113 : pos += 2 + pos[1];
1597 : }
1598 :
1599 788 : if (wpabuf_len(buf) == 0) {
1600 17 : wpabuf_free(buf);
1601 17 : buf = NULL;
1602 : }
1603 :
1604 788 : 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 1318 : static int wpa_scan_result_compar(const void *a, const void *b)
1623 : {
1624 : #define MIN(a,b) a < b ? a : b
1625 1318 : struct wpa_scan_res **_wa = (void *) a;
1626 1318 : struct wpa_scan_res **_wb = (void *) b;
1627 1318 : struct wpa_scan_res *wa = *_wa;
1628 1318 : 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 2609 : wpa_a = wpa_scan_get_vendor_ie(wa, WPA_IE_VENDOR_TYPE) != NULL ||
1634 1291 : wpa_scan_get_ie(wa, WLAN_EID_RSN) != NULL;
1635 2606 : wpa_b = wpa_scan_get_vendor_ie(wb, WPA_IE_VENDOR_TYPE) != NULL ||
1636 1288 : wpa_scan_get_ie(wb, WLAN_EID_RSN) != NULL;
1637 :
1638 1318 : if (wpa_b && !wpa_a)
1639 126 : return 1;
1640 1192 : if (!wpa_b && wpa_a)
1641 267 : return -1;
1642 :
1643 : /* privacy support preferred */
1644 1284 : if ((wa->caps & IEEE80211_CAP_PRIVACY) == 0 &&
1645 359 : (wb->caps & IEEE80211_CAP_PRIVACY))
1646 122 : return 1;
1647 1369 : if ((wa->caps & IEEE80211_CAP_PRIVACY) &&
1648 566 : (wb->caps & IEEE80211_CAP_PRIVACY) == 0)
1649 11 : return -1;
1650 :
1651 792 : if (wa->flags & wb->flags & WPA_SCAN_LEVEL_DBM) {
1652 792 : snr_a_full = wa->snr;
1653 792 : snr_a = MIN(wa->snr, GREAT_SNR);
1654 792 : snr_b_full = wb->snr;
1655 792 : 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 0 : snr_a = snr_a_full = wa->level;
1660 0 : snr_b = snr_b_full = wb->level;
1661 : }
1662 :
1663 : /* if SNR is close, decide by max rate or frequency band */
1664 792 : if ((snr_a && snr_b && abs(snr_b - snr_a) < 5) ||
1665 0 : (wa->qual && wb->qual && abs(wb->qual - wa->qual) < 10)) {
1666 792 : if (wa->est_throughput != wb->est_throughput)
1667 21 : return wb->est_throughput - wa->est_throughput;
1668 771 : if (IS_5GHZ(wa->freq) ^ IS_5GHZ(wb->freq))
1669 3 : 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 768 : if (snr_b_full == snr_a_full)
1676 481 : return wb->qual - wa->qual;
1677 287 : 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 105 : static int wpa_scan_result_wps_compar(const void *a, const void *b)
1686 : {
1687 105 : struct wpa_scan_res **_wa = (void *) a;
1688 105 : struct wpa_scan_res **_wb = (void *) b;
1689 105 : struct wpa_scan_res *wa = *_wa;
1690 105 : 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 105 : uses_wps_a = wpa_scan_get_vendor_ie(wa, WPS_IE_VENDOR_TYPE) != NULL;
1698 105 : uses_wps_b = wpa_scan_get_vendor_ie(wb, WPS_IE_VENDOR_TYPE) != NULL;
1699 105 : if (uses_wps_a && !uses_wps_b)
1700 6 : return -1;
1701 99 : if (!uses_wps_a && uses_wps_b)
1702 19 : return 1;
1703 :
1704 80 : if (uses_wps_a && uses_wps_b) {
1705 79 : wps_a = wpa_scan_get_vendor_ie_multi(wa, WPS_IE_VENDOR_TYPE);
1706 79 : wps_b = wpa_scan_get_vendor_ie_multi(wb, WPS_IE_VENDOR_TYPE);
1707 79 : res = wps_ap_priority_compar(wps_a, wps_b);
1708 79 : wpabuf_free(wps_a);
1709 79 : wpabuf_free(wps_b);
1710 79 : if (res)
1711 30 : 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 50 : if (wb->level == wa->level)
1724 49 : return wb->qual - wa->qual;
1725 1 : return wb->level - wa->level;
1726 : }
1727 : #endif /* CONFIG_WPS */
1728 :
1729 :
1730 2911 : static void dump_scan_res(struct wpa_scan_results *scan_res)
1731 : {
1732 : #ifndef CONFIG_NO_STDOUT_DEBUG
1733 : size_t i;
1734 :
1735 2911 : if (scan_res->res == NULL || scan_res->num == 0)
1736 3169 : return;
1737 :
1738 2653 : wpa_printf(MSG_EXCESSIVE, "Sorted scan results");
1739 :
1740 6589 : for (i = 0; i < scan_res->num; i++) {
1741 3936 : struct wpa_scan_res *r = scan_res->res[i];
1742 : u8 *pos;
1743 3936 : if (r->flags & WPA_SCAN_LEVEL_DBM) {
1744 3936 : int noise_valid = !(r->flags & WPA_SCAN_NOISE_INVALID);
1745 :
1746 31488 : 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 23616 : MAC2STR(r->bssid), r->freq, r->qual,
1749 : r->noise, noise_valid ? "" : "~", r->level,
1750 3936 : r->snr, r->snr >= GREAT_SNR ? "*" : "",
1751 : r->flags,
1752 : r->age, r->est_throughput);
1753 : } else {
1754 0 : wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d "
1755 : "noise=%d level=%d flags=0x%x age=%u est=%u",
1756 0 : MAC2STR(r->bssid), r->freq, r->qual,
1757 : r->noise, r->level, r->flags, r->age,
1758 : r->est_throughput);
1759 : }
1760 3936 : pos = (u8 *) (r + 1);
1761 3936 : if (r->ie_len)
1762 3936 : wpa_hexdump(MSG_EXCESSIVE, "IEs", pos, r->ie_len);
1763 3936 : pos += r->ie_len;
1764 3936 : if (r->beacon_ie_len)
1765 2076 : 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 8135 : int wpa_supplicant_filter_bssid_match(struct wpa_supplicant *wpa_s,
1782 : const u8 *bssid)
1783 : {
1784 : size_t i;
1785 :
1786 8135 : if (wpa_s->bssid_filter == NULL)
1787 8125 : return 1;
1788 :
1789 13 : for (i = 0; i < wpa_s->bssid_filter_count; i++) {
1790 10 : if (os_memcmp(wpa_s->bssid_filter + i * ETH_ALEN, bssid,
1791 : ETH_ALEN) == 0)
1792 7 : return 1;
1793 : }
1794 :
1795 3 : return 0;
1796 : }
1797 :
1798 :
1799 2911 : static void filter_scan_res(struct wpa_supplicant *wpa_s,
1800 : struct wpa_scan_results *res)
1801 : {
1802 : size_t i, j;
1803 :
1804 2911 : if (wpa_s->bssid_filter == NULL)
1805 5820 : return;
1806 :
1807 6 : for (i = 0, j = 0; i < res->num; i++) {
1808 4 : if (wpa_supplicant_filter_bssid_match(wpa_s,
1809 4 : res->res[i]->bssid)) {
1810 2 : res->res[j++] = res->res[i];
1811 : } else {
1812 2 : os_free(res->res[i]);
1813 2 : res->res[i] = NULL;
1814 : }
1815 : }
1816 :
1817 2 : if (res->num != j) {
1818 2 : wpa_printf(MSG_DEBUG, "Filtered out %d scan results",
1819 2 : (int) (res->num - j));
1820 2 : 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 3936 : static void scan_snr(struct wpa_scan_res *res)
1834 : {
1835 3936 : if (res->flags & WPA_SCAN_NOISE_INVALID) {
1836 2324 : res->noise = IS_5GHZ(res->freq) ?
1837 1162 : DEFAULT_NOISE_FLOOR_5GHZ :
1838 : DEFAULT_NOISE_FLOOR_2GHZ;
1839 : }
1840 :
1841 3936 : if (res->flags & WPA_SCAN_LEVEL_DBM) {
1842 3936 : 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 0 : res->snr = res->level;
1847 : }
1848 3936 : }
1849 :
1850 :
1851 2895 : static unsigned int max_ht20_rate(int snr)
1852 : {
1853 2895 : if (snr < 6)
1854 0 : return 6500; /* HT20 MCS0 */
1855 2895 : if (snr < 8)
1856 0 : return 13000; /* HT20 MCS1 */
1857 2895 : if (snr < 13)
1858 0 : return 19500; /* HT20 MCS2 */
1859 2895 : if (snr < 17)
1860 0 : return 26000; /* HT20 MCS3 */
1861 2895 : if (snr < 20)
1862 0 : return 39000; /* HT20 MCS4 */
1863 2895 : if (snr < 23)
1864 0 : return 52000; /* HT20 MCS5 */
1865 2895 : if (snr < 24)
1866 0 : return 58500; /* HT20 MCS6 */
1867 2895 : return 65000; /* HT20 MCS7 */
1868 : }
1869 :
1870 :
1871 58 : static unsigned int max_ht40_rate(int snr)
1872 : {
1873 58 : if (snr < 3)
1874 0 : return 13500; /* HT40 MCS0 */
1875 58 : if (snr < 6)
1876 0 : return 27000; /* HT40 MCS1 */
1877 58 : if (snr < 10)
1878 0 : return 40500; /* HT40 MCS2 */
1879 58 : if (snr < 15)
1880 0 : return 54000; /* HT40 MCS3 */
1881 58 : if (snr < 17)
1882 0 : return 81000; /* HT40 MCS4 */
1883 58 : if (snr < 22)
1884 0 : return 108000; /* HT40 MCS5 */
1885 58 : if (snr < 24)
1886 0 : return 121500; /* HT40 MCS6 */
1887 58 : return 135000; /* HT40 MCS7 */
1888 : }
1889 :
1890 :
1891 9 : static unsigned int max_vht80_rate(int snr)
1892 : {
1893 9 : if (snr < 1)
1894 0 : return 0;
1895 9 : if (snr < 2)
1896 0 : return 29300; /* VHT80 MCS0 */
1897 9 : if (snr < 5)
1898 0 : return 58500; /* VHT80 MCS1 */
1899 9 : if (snr < 9)
1900 0 : return 87800; /* VHT80 MCS2 */
1901 9 : if (snr < 11)
1902 0 : return 117000; /* VHT80 MCS3 */
1903 9 : if (snr < 15)
1904 0 : return 175500; /* VHT80 MCS4 */
1905 9 : if (snr < 16)
1906 0 : return 234000; /* VHT80 MCS5 */
1907 9 : if (snr < 18)
1908 0 : return 263300; /* VHT80 MCS6 */
1909 9 : if (snr < 20)
1910 0 : return 292500; /* VHT80 MCS7 */
1911 9 : if (snr < 22)
1912 0 : return 351000; /* VHT80 MCS8 */
1913 9 : return 390000; /* VHT80 MCS9 */
1914 : }
1915 :
1916 :
1917 3936 : static void scan_est_throughput(struct wpa_supplicant *wpa_s,
1918 : struct wpa_scan_res *res)
1919 : {
1920 3936 : 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 3936 : int snr = res->snr;
1925 :
1926 3936 : if (res->est_throughput)
1927 3936 : return;
1928 :
1929 : /* Get maximum legacy rate */
1930 3936 : rate = wpa_scan_get_max_rate(res);
1931 :
1932 : /* Limit based on estimated SNR */
1933 3936 : if (rate > 1 * 2 && snr < 1)
1934 0 : rate = 1 * 2;
1935 3936 : else if (rate > 2 * 2 && snr < 4)
1936 0 : rate = 2 * 2;
1937 3936 : else if (rate > 6 * 2 && snr < 5)
1938 0 : rate = 6 * 2;
1939 3936 : else if (rate > 9 * 2 && snr < 6)
1940 0 : rate = 9 * 2;
1941 3936 : else if (rate > 12 * 2 && snr < 7)
1942 0 : rate = 12 * 2;
1943 3936 : else if (rate > 18 * 2 && snr < 10)
1944 0 : rate = 18 * 2;
1945 3936 : else if (rate > 24 * 2 && snr < 11)
1946 0 : rate = 24 * 2;
1947 3936 : else if (rate > 36 * 2 && snr < 15)
1948 0 : rate = 36 * 2;
1949 3936 : else if (rate > 48 * 2 && snr < 19)
1950 0 : rate = 48 * 2;
1951 3936 : else if (rate > 54 * 2 && snr < 21)
1952 0 : rate = 54 * 2;
1953 3936 : est = rate * 500;
1954 :
1955 3936 : if (capab == CAPAB_HT || capab == CAPAB_HT40 || capab == CAPAB_VHT) {
1956 3907 : ie = wpa_scan_get_ie(res, WLAN_EID_HT_CAP);
1957 3907 : if (ie) {
1958 2880 : tmp = max_ht20_rate(snr);
1959 2880 : if (tmp > est)
1960 2880 : est = tmp;
1961 : }
1962 : }
1963 :
1964 3936 : if (capab == CAPAB_HT40 || capab == CAPAB_VHT) {
1965 3907 : ie = wpa_scan_get_ie(res, WLAN_EID_HT_OPERATION);
1966 6787 : if (ie && ie[1] >= 2 &&
1967 2880 : (ie[3] & HT_INFO_HT_PARAM_SECONDARY_CHNL_OFF_MASK)) {
1968 47 : tmp = max_ht40_rate(snr);
1969 47 : if (tmp > est)
1970 47 : est = tmp;
1971 : }
1972 : }
1973 :
1974 3936 : if (capab == CAPAB_VHT) {
1975 : /* Use +1 to assume VHT is always faster than HT */
1976 3907 : ie = wpa_scan_get_ie(res, WLAN_EID_VHT_CAP);
1977 3907 : if (ie) {
1978 15 : tmp = max_ht20_rate(snr) + 1;
1979 15 : if (tmp > est)
1980 4 : est = tmp;
1981 :
1982 15 : ie = wpa_scan_get_ie(res, WLAN_EID_HT_OPERATION);
1983 30 : if (ie && ie[1] >= 2 &&
1984 15 : (ie[3] &
1985 : HT_INFO_HT_PARAM_SECONDARY_CHNL_OFF_MASK)) {
1986 11 : tmp = max_ht40_rate(snr) + 1;
1987 11 : if (tmp > est)
1988 11 : est = tmp;
1989 : }
1990 :
1991 15 : ie = wpa_scan_get_ie(res, WLAN_EID_VHT_OPERATION);
1992 30 : if (ie && ie[1] >= 1 &&
1993 15 : (ie[2] & VHT_OPMODE_CHANNEL_WIDTH_MASK)) {
1994 9 : tmp = max_vht80_rate(snr) + 1;
1995 9 : if (tmp > est)
1996 9 : est = tmp;
1997 : }
1998 : }
1999 : }
2000 :
2001 : /* TODO: channel utilization and AP load (e.g., from AP Beacon) */
2002 :
2003 3936 : 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 2911 : 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 2911 : int (*compar)(const void *, const void *) = wpa_scan_result_compar;
2025 :
2026 2911 : scan_res = wpa_drv_get_scan_results2(wpa_s);
2027 2911 : if (scan_res == NULL) {
2028 0 : wpa_dbg(wpa_s, MSG_DEBUG, "Failed to get scan results");
2029 0 : return NULL;
2030 : }
2031 2911 : 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 2911 : os_get_reltime(&scan_res->fetch_time);
2037 : }
2038 2911 : filter_scan_res(wpa_s, scan_res);
2039 :
2040 6847 : for (i = 0; i < scan_res->num; i++) {
2041 3936 : struct wpa_scan_res *scan_res_item = scan_res->res[i];
2042 :
2043 3936 : scan_snr(scan_res_item);
2044 3936 : scan_est_throughput(wpa_s, scan_res_item);
2045 : }
2046 :
2047 : #ifdef CONFIG_WPS
2048 2911 : if (wpas_wps_searching(wpa_s)) {
2049 406 : wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Order scan results with WPS "
2050 : "provisioning rules");
2051 406 : compar = wpa_scan_result_wps_compar;
2052 : }
2053 : #endif /* CONFIG_WPS */
2054 :
2055 2911 : qsort(scan_res->res, scan_res->num, sizeof(struct wpa_scan_res *),
2056 : compar);
2057 2911 : dump_scan_res(scan_res);
2058 :
2059 2911 : wpa_bss_update_start(wpa_s);
2060 6847 : for (i = 0; i < scan_res->num; i++)
2061 3936 : wpa_bss_update_scan_res(wpa_s, scan_res->res[i],
2062 : &scan_res->fetch_time);
2063 2911 : wpa_bss_update_end(wpa_s, info, new_scan);
2064 :
2065 2911 : 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 16 : int wpa_supplicant_update_scan_results(struct wpa_supplicant *wpa_s)
2082 : {
2083 : struct wpa_scan_results *scan_res;
2084 16 : scan_res = wpa_supplicant_get_scan_results(wpa_s, NULL, 0);
2085 16 : if (scan_res == NULL)
2086 0 : return -1;
2087 16 : wpa_scan_results_free(scan_res);
2088 :
2089 16 : return 0;
2090 : }
2091 :
2092 :
2093 : /**
2094 : * scan_only_handler - Reports scan results
2095 : */
2096 290 : void scan_only_handler(struct wpa_supplicant *wpa_s,
2097 : struct wpa_scan_results *scan_res)
2098 : {
2099 290 : wpa_dbg(wpa_s, MSG_DEBUG, "Scan-only results received");
2100 290 : if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
2101 3 : wpa_s->manual_scan_use_id && wpa_s->own_scan_running) {
2102 3 : wpa_msg_ctrl(wpa_s, MSG_INFO, WPA_EVENT_SCAN_RESULTS "id=%u",
2103 : wpa_s->manual_scan_id);
2104 3 : wpa_s->manual_scan_use_id = 0;
2105 : } else {
2106 287 : wpa_msg_ctrl(wpa_s, MSG_INFO, WPA_EVENT_SCAN_RESULTS);
2107 : }
2108 290 : wpas_notify_scan_results(wpa_s);
2109 290 : wpas_notify_scan_done(wpa_s, 1);
2110 290 : if (wpa_s->scan_work) {
2111 290 : struct wpa_radio_work *work = wpa_s->scan_work;
2112 290 : wpa_s->scan_work = NULL;
2113 290 : radio_work_done(work);
2114 : }
2115 290 : }
2116 :
2117 :
2118 0 : int wpas_scan_scheduled(struct wpa_supplicant *wpa_s)
2119 : {
2120 0 : return eloop_is_timeout_registered(wpa_supplicant_scan, wpa_s, NULL);
2121 : }
2122 :
2123 :
2124 : struct wpa_driver_scan_params *
2125 2034 : 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 2034 : params = os_zalloc(sizeof(*params));
2132 2034 : if (params == NULL)
2133 1 : return NULL;
2134 :
2135 4059 : for (i = 0; i < src->num_ssids; i++) {
2136 2026 : if (src->ssids[i].ssid) {
2137 269 : n = os_malloc(src->ssids[i].ssid_len);
2138 269 : if (n == NULL)
2139 0 : goto failed;
2140 269 : os_memcpy(n, src->ssids[i].ssid,
2141 : src->ssids[i].ssid_len);
2142 269 : params->ssids[i].ssid = n;
2143 269 : params->ssids[i].ssid_len = src->ssids[i].ssid_len;
2144 : }
2145 : }
2146 2033 : params->num_ssids = src->num_ssids;
2147 :
2148 2033 : if (src->extra_ies) {
2149 2021 : n = os_malloc(src->extra_ies_len);
2150 2021 : if (n == NULL)
2151 0 : goto failed;
2152 2021 : os_memcpy(n, src->extra_ies, src->extra_ies_len);
2153 2021 : params->extra_ies = n;
2154 2021 : params->extra_ies_len = src->extra_ies_len;
2155 : }
2156 :
2157 2033 : if (src->freqs) {
2158 1862 : int len = int_array_len(src->freqs);
2159 1862 : params->freqs = os_malloc((len + 1) * sizeof(int));
2160 1862 : if (params->freqs == NULL)
2161 0 : goto failed;
2162 1862 : os_memcpy(params->freqs, src->freqs, (len + 1) * sizeof(int));
2163 : }
2164 :
2165 2033 : if (src->filter_ssids) {
2166 2 : params->filter_ssids = os_malloc(sizeof(*params->filter_ssids) *
2167 2 : src->num_filter_ssids);
2168 2 : if (params->filter_ssids == NULL)
2169 0 : goto failed;
2170 2 : os_memcpy(params->filter_ssids, src->filter_ssids,
2171 : sizeof(*params->filter_ssids) *
2172 : src->num_filter_ssids);
2173 2 : params->num_filter_ssids = src->num_filter_ssids;
2174 : }
2175 :
2176 2033 : params->filter_rssi = src->filter_rssi;
2177 2033 : params->p2p_probe = src->p2p_probe;
2178 2033 : params->only_new_results = src->only_new_results;
2179 2033 : params->low_priority = src->low_priority;
2180 :
2181 2033 : if (src->mac_addr_rand) {
2182 3 : params->mac_addr_rand = src->mac_addr_rand;
2183 :
2184 3 : if (src->mac_addr && src->mac_addr_mask) {
2185 : u8 *mac_addr;
2186 :
2187 2 : mac_addr = os_malloc(2 * ETH_ALEN);
2188 2 : if (!mac_addr)
2189 0 : goto failed;
2190 :
2191 2 : os_memcpy(mac_addr, src->mac_addr, ETH_ALEN);
2192 2 : os_memcpy(mac_addr + ETH_ALEN, src->mac_addr_mask,
2193 : ETH_ALEN);
2194 2 : params->mac_addr = mac_addr;
2195 2 : params->mac_addr_mask = mac_addr + ETH_ALEN;
2196 : }
2197 : }
2198 2033 : return params;
2199 :
2200 : failed:
2201 0 : wpa_scan_free_params(params);
2202 0 : return NULL;
2203 : }
2204 :
2205 :
2206 2797 : void wpa_scan_free_params(struct wpa_driver_scan_params *params)
2207 : {
2208 : size_t i;
2209 :
2210 2797 : if (params == NULL)
2211 2797 : return;
2212 :
2213 5587 : for (i = 0; i < params->num_ssids; i++)
2214 2790 : os_free((u8 *) params->ssids[i].ssid);
2215 2797 : os_free((u8 *) params->extra_ies);
2216 2797 : os_free(params->freqs);
2217 2797 : 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 2797 : os_free((u8 *) params->mac_addr);
2224 :
2225 2797 : os_free(params);
2226 : }
2227 :
2228 :
2229 4 : 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 4 : if (!wpa_s->sched_scan_supported)
2237 4 : return -1;
2238 :
2239 0 : if (wpa_s->pno || wpa_s->pno_sched_pending)
2240 0 : return 0;
2241 :
2242 0 : if ((wpa_s->wpa_state > WPA_SCANNING) &&
2243 0 : (wpa_s->wpa_state <= WPA_COMPLETED)) {
2244 0 : wpa_printf(MSG_ERROR, "PNO: In assoc process");
2245 0 : return -EAGAIN;
2246 : }
2247 :
2248 0 : if (wpa_s->wpa_state == WPA_SCANNING) {
2249 0 : wpa_supplicant_cancel_scan(wpa_s);
2250 0 : if (wpa_s->sched_scanning) {
2251 0 : wpa_printf(MSG_DEBUG, "Schedule PNO on completion of "
2252 : "ongoing sched scan");
2253 0 : wpa_supplicant_cancel_sched_scan(wpa_s);
2254 0 : wpa_s->pno_sched_pending = 1;
2255 0 : return 0;
2256 : }
2257 : }
2258 :
2259 0 : os_memset(¶ms, 0, sizeof(params));
2260 :
2261 0 : num_ssid = num_match_ssid = 0;
2262 0 : ssid = wpa_s->conf->ssid;
2263 0 : while (ssid) {
2264 0 : if (!wpas_network_disabled(wpa_s, ssid)) {
2265 0 : num_match_ssid++;
2266 0 : if (ssid->scan_ssid)
2267 0 : num_ssid++;
2268 : }
2269 0 : ssid = ssid->next;
2270 : }
2271 :
2272 0 : if (num_match_ssid == 0) {
2273 0 : wpa_printf(MSG_DEBUG, "PNO: No configured SSIDs");
2274 0 : return -1;
2275 : }
2276 :
2277 0 : if (num_match_ssid > num_ssid) {
2278 0 : params.num_ssids++; /* wildcard */
2279 0 : num_ssid++;
2280 : }
2281 :
2282 0 : if (num_ssid > WPAS_MAX_SCAN_SSIDS) {
2283 0 : wpa_printf(MSG_DEBUG, "PNO: Use only the first %u SSIDs from "
2284 : "%u", WPAS_MAX_SCAN_SSIDS, (unsigned int) num_ssid);
2285 0 : num_ssid = WPAS_MAX_SCAN_SSIDS;
2286 : }
2287 :
2288 0 : if (num_match_ssid > wpa_s->max_match_sets) {
2289 0 : num_match_ssid = wpa_s->max_match_sets;
2290 0 : wpa_dbg(wpa_s, MSG_DEBUG, "PNO: Too many SSIDs to match");
2291 : }
2292 0 : params.filter_ssids = os_calloc(num_match_ssid,
2293 : sizeof(struct wpa_driver_scan_filter));
2294 0 : if (params.filter_ssids == NULL)
2295 0 : return -1;
2296 :
2297 0 : i = 0;
2298 0 : prio = 0;
2299 0 : ssid = wpa_s->conf->pssid[prio];
2300 0 : while (ssid) {
2301 0 : if (!wpas_network_disabled(wpa_s, ssid)) {
2302 0 : if (ssid->scan_ssid && params.num_ssids < num_ssid) {
2303 0 : params.ssids[params.num_ssids].ssid =
2304 0 : ssid->ssid;
2305 0 : params.ssids[params.num_ssids].ssid_len =
2306 0 : ssid->ssid_len;
2307 0 : params.num_ssids++;
2308 : }
2309 0 : os_memcpy(params.filter_ssids[i].ssid, ssid->ssid,
2310 : ssid->ssid_len);
2311 0 : params.filter_ssids[i].ssid_len = ssid->ssid_len;
2312 0 : params.num_filter_ssids++;
2313 0 : i++;
2314 0 : if (i == num_match_ssid)
2315 0 : break;
2316 : }
2317 0 : if (ssid->pnext)
2318 0 : ssid = ssid->pnext;
2319 0 : else if (prio + 1 == wpa_s->conf->num_prio)
2320 0 : break;
2321 : else
2322 0 : ssid = wpa_s->conf->pssid[++prio];
2323 : }
2324 :
2325 0 : if (wpa_s->conf->filter_rssi)
2326 0 : params.filter_rssi = wpa_s->conf->filter_rssi;
2327 :
2328 0 : interval = wpa_s->conf->sched_scan_interval ?
2329 0 : wpa_s->conf->sched_scan_interval : 10;
2330 :
2331 0 : if (params.freqs == NULL && wpa_s->manual_sched_scan_freqs) {
2332 0 : wpa_dbg(wpa_s, MSG_DEBUG, "Limit sched scan to specified channels");
2333 0 : params.freqs = wpa_s->manual_sched_scan_freqs;
2334 : }
2335 :
2336 0 : if (wpa_s->mac_addr_rand_enable & MAC_ADDR_RAND_PNO) {
2337 0 : params.mac_addr_rand = 1;
2338 0 : if (wpa_s->mac_addr_pno) {
2339 0 : params.mac_addr = wpa_s->mac_addr_pno;
2340 0 : params.mac_addr_mask = wpa_s->mac_addr_pno + ETH_ALEN;
2341 : }
2342 : }
2343 :
2344 0 : ret = wpa_supplicant_start_sched_scan(wpa_s, ¶ms, interval);
2345 0 : os_free(params.filter_ssids);
2346 0 : if (ret == 0)
2347 0 : wpa_s->pno = 1;
2348 : else
2349 0 : wpa_msg(wpa_s, MSG_ERROR, "Failed to schedule PNO");
2350 0 : return ret;
2351 : }
2352 :
2353 :
2354 1 : int wpas_stop_pno(struct wpa_supplicant *wpa_s)
2355 : {
2356 1 : int ret = 0;
2357 :
2358 1 : if (!wpa_s->pno)
2359 1 : return 0;
2360 :
2361 0 : ret = wpa_supplicant_stop_sched_scan(wpa_s);
2362 :
2363 0 : wpa_s->pno = 0;
2364 0 : wpa_s->pno_sched_pending = 0;
2365 :
2366 0 : if (wpa_s->wpa_state == WPA_SCANNING)
2367 0 : wpa_supplicant_req_scan(wpa_s, 0, 0);
2368 :
2369 0 : return ret;
2370 : }
2371 :
2372 :
2373 292 : void wpas_mac_addr_rand_scan_clear(struct wpa_supplicant *wpa_s,
2374 : unsigned int type)
2375 : {
2376 292 : type &= MAC_ADDR_RAND_ALL;
2377 292 : wpa_s->mac_addr_rand_enable &= ~type;
2378 :
2379 292 : if (type & MAC_ADDR_RAND_SCAN) {
2380 292 : os_free(wpa_s->mac_addr_scan);
2381 292 : wpa_s->mac_addr_scan = NULL;
2382 : }
2383 :
2384 292 : if (type & MAC_ADDR_RAND_SCHED_SCAN) {
2385 288 : os_free(wpa_s->mac_addr_sched_scan);
2386 288 : wpa_s->mac_addr_sched_scan = NULL;
2387 : }
2388 :
2389 292 : if (type & MAC_ADDR_RAND_PNO) {
2390 288 : os_free(wpa_s->mac_addr_pno);
2391 288 : wpa_s->mac_addr_pno = NULL;
2392 : }
2393 292 : }
2394 :
2395 :
2396 3 : 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 3 : u8 *tmp = NULL;
2401 :
2402 3 : wpas_mac_addr_rand_scan_clear(wpa_s, type);
2403 :
2404 3 : if (addr) {
2405 2 : tmp = os_malloc(2 * ETH_ALEN);
2406 2 : if (!tmp)
2407 0 : return -1;
2408 2 : os_memcpy(tmp, addr, ETH_ALEN);
2409 2 : os_memcpy(tmp + ETH_ALEN, mask, ETH_ALEN);
2410 : }
2411 :
2412 3 : if (type == MAC_ADDR_RAND_SCAN) {
2413 3 : wpa_s->mac_addr_scan = tmp;
2414 0 : } else if (type == MAC_ADDR_RAND_SCHED_SCAN) {
2415 0 : wpa_s->mac_addr_sched_scan = tmp;
2416 0 : } else if (type == MAC_ADDR_RAND_PNO) {
2417 0 : wpa_s->mac_addr_pno = tmp;
2418 : } else {
2419 0 : wpa_printf(MSG_INFO,
2420 : "scan: Invalid MAC randomization type=0x%x",
2421 : type);
2422 0 : os_free(tmp);
2423 0 : return -1;
2424 : }
2425 :
2426 3 : wpa_s->mac_addr_rand_enable |= type;
2427 3 : return 0;
2428 : }
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