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Commit | Line | Data |
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6fc6879b JM |
1 | /* |
2 | * WPA Supplicant - Scanning | |
2c09af30 | 3 | * Copyright (c) 2003-2012, Jouni Malinen <j@w1.fi> |
6fc6879b | 4 | * |
0f3d578e JM |
5 | * This software may be distributed under the terms of the BSD license. |
6 | * See README for more details. | |
6fc6879b JM |
7 | */ |
8 | ||
9ba9fa07 | 9 | #include "utils/includes.h" |
6fc6879b | 10 | |
9ba9fa07 JM |
11 | #include "utils/common.h" |
12 | #include "utils/eloop.h" | |
13 | #include "common/ieee802_11_defs.h" | |
6fc6879b JM |
14 | #include "config.h" |
15 | #include "wpa_supplicant_i.h" | |
2d5b792d | 16 | #include "driver_i.h" |
b01c18a8 | 17 | #include "wps_supplicant.h" |
0e65037c JM |
18 | #include "p2p_supplicant.h" |
19 | #include "p2p/p2p.h" | |
c923b8a5 | 20 | #include "hs20_supplicant.h" |
8bac466b | 21 | #include "notify.h" |
9ba9fa07 JM |
22 | #include "bss.h" |
23 | #include "scan.h" | |
6fc6879b JM |
24 | |
25 | ||
26 | static void wpa_supplicant_gen_assoc_event(struct wpa_supplicant *wpa_s) | |
27 | { | |
28 | struct wpa_ssid *ssid; | |
29 | union wpa_event_data data; | |
30 | ||
31 | ssid = wpa_supplicant_get_ssid(wpa_s); | |
32 | if (ssid == NULL) | |
33 | return; | |
34 | ||
8bac466b | 35 | if (wpa_s->current_ssid == NULL) { |
6fc6879b | 36 | wpa_s->current_ssid = ssid; |
8bac466b JM |
37 | if (wpa_s->current_ssid != NULL) |
38 | wpas_notify_network_changed(wpa_s); | |
39 | } | |
6fc6879b | 40 | wpa_supplicant_initiate_eapol(wpa_s); |
f049052b BG |
41 | wpa_dbg(wpa_s, MSG_DEBUG, "Already associated with a configured " |
42 | "network - generating associated event"); | |
6fc6879b JM |
43 | os_memset(&data, 0, sizeof(data)); |
44 | wpa_supplicant_event(wpa_s, EVENT_ASSOC, &data); | |
45 | } | |
46 | ||
47 | ||
ad08c363 | 48 | #ifdef CONFIG_WPS |
5f738a21 | 49 | static int wpas_wps_in_use(struct wpa_supplicant *wpa_s, |
f90c86d4 | 50 | enum wps_request_type *req_type) |
ad08c363 JM |
51 | { |
52 | struct wpa_ssid *ssid; | |
53 | int wps = 0; | |
ad08c363 | 54 | |
5f738a21 | 55 | for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) { |
ad08c363 JM |
56 | if (!(ssid->key_mgmt & WPA_KEY_MGMT_WPS)) |
57 | continue; | |
58 | ||
59 | wps = 1; | |
b01c18a8 | 60 | *req_type = wpas_wps_get_req_type(ssid); |
ad08c363 JM |
61 | if (!ssid->eap.phase1) |
62 | continue; | |
63 | ||
ad08c363 JM |
64 | if (os_strstr(ssid->eap.phase1, "pbc=1")) |
65 | return 2; | |
66 | } | |
67 | ||
5f738a21 | 68 | #ifdef CONFIG_P2P |
7a808c7e JM |
69 | if (!wpa_s->global->p2p_disabled && wpa_s->global->p2p && |
70 | !wpa_s->conf->p2p_disabled) { | |
b21ff9cb JM |
71 | wpa_s->wps->dev.p2p = 1; |
72 | if (!wps) { | |
73 | wps = 1; | |
74 | *req_type = WPS_REQ_ENROLLEE_INFO; | |
75 | } | |
5f738a21 LC |
76 | } |
77 | #endif /* CONFIG_P2P */ | |
78 | ||
ad08c363 JM |
79 | return wps; |
80 | } | |
81 | #endif /* CONFIG_WPS */ | |
82 | ||
e76baaac | 83 | |
2c09af30 JM |
84 | /** |
85 | * wpa_supplicant_enabled_networks - Check whether there are enabled networks | |
86 | * @wpa_s: Pointer to wpa_supplicant data | |
87 | * Returns: 0 if no networks are enabled, >0 if networks are enabled | |
88 | * | |
89 | * This function is used to figure out whether any networks (or Interworking | |
90 | * with enabled credentials and auto_interworking) are present in the current | |
91 | * configuration. | |
92 | */ | |
349493bd | 93 | int wpa_supplicant_enabled_networks(struct wpa_supplicant *wpa_s) |
e76baaac | 94 | { |
349493bd | 95 | struct wpa_ssid *ssid = wpa_s->conf->ssid; |
d4534bde | 96 | int count = 0, disabled = 0; |
e76baaac | 97 | while (ssid) { |
349493bd | 98 | if (!wpas_network_disabled(wpa_s, ssid)) |
5471c343 | 99 | count++; |
d4534bde JM |
100 | else |
101 | disabled++; | |
e76baaac JM |
102 | ssid = ssid->next; |
103 | } | |
4d5bda5f JM |
104 | if (wpa_s->conf->cred && wpa_s->conf->interworking && |
105 | wpa_s->conf->auto_interworking) | |
106 | count++; | |
d4534bde JM |
107 | if (count == 0 && disabled > 0) { |
108 | wpa_dbg(wpa_s, MSG_DEBUG, "No enabled networks (%d disabled " | |
109 | "networks)", disabled); | |
110 | } | |
5471c343 | 111 | return count; |
e76baaac JM |
112 | } |
113 | ||
114 | ||
115 | static void wpa_supplicant_assoc_try(struct wpa_supplicant *wpa_s, | |
116 | struct wpa_ssid *ssid) | |
117 | { | |
118 | while (ssid) { | |
349493bd | 119 | if (!wpas_network_disabled(wpa_s, ssid)) |
e76baaac JM |
120 | break; |
121 | ssid = ssid->next; | |
122 | } | |
123 | ||
124 | /* ap_scan=2 mode - try to associate with each SSID. */ | |
125 | if (ssid == NULL) { | |
f049052b BG |
126 | wpa_dbg(wpa_s, MSG_DEBUG, "wpa_supplicant_assoc_try: Reached " |
127 | "end of scan list - go back to beginning"); | |
ba2a573c | 128 | wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN; |
e76baaac JM |
129 | wpa_supplicant_req_scan(wpa_s, 0, 0); |
130 | return; | |
131 | } | |
132 | if (ssid->next) { | |
133 | /* Continue from the next SSID on the next attempt. */ | |
134 | wpa_s->prev_scan_ssid = ssid; | |
135 | } else { | |
136 | /* Start from the beginning of the SSID list. */ | |
ba2a573c | 137 | wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN; |
e76baaac JM |
138 | } |
139 | wpa_supplicant_associate(wpa_s, NULL, ssid); | |
140 | } | |
141 | ||
142 | ||
d3a98225 JM |
143 | static int int_array_len(const int *a) |
144 | { | |
145 | int i; | |
146 | for (i = 0; a && a[i]; i++) | |
147 | ; | |
148 | return i; | |
149 | } | |
150 | ||
151 | ||
152 | static void int_array_concat(int **res, const int *a) | |
153 | { | |
154 | int reslen, alen, i; | |
155 | int *n; | |
156 | ||
157 | reslen = int_array_len(*res); | |
158 | alen = int_array_len(a); | |
159 | ||
067ffa26 | 160 | n = os_realloc_array(*res, reslen + alen + 1, sizeof(int)); |
d3a98225 JM |
161 | if (n == NULL) { |
162 | os_free(*res); | |
163 | *res = NULL; | |
e6c0ebff | 164 | return; |
d3a98225 JM |
165 | } |
166 | for (i = 0; i <= alen; i++) | |
167 | n[reslen + i] = a[i]; | |
168 | *res = n; | |
169 | } | |
170 | ||
171 | ||
172 | static int freq_cmp(const void *a, const void *b) | |
173 | { | |
174 | int _a = *(int *) a; | |
175 | int _b = *(int *) b; | |
176 | ||
177 | if (_a == 0) | |
178 | return 1; | |
179 | if (_b == 0) | |
180 | return -1; | |
181 | return _a - _b; | |
182 | } | |
183 | ||
184 | ||
185 | static void int_array_sort_unique(int *a) | |
186 | { | |
187 | int alen; | |
188 | int i, j; | |
189 | ||
190 | if (a == NULL) | |
191 | return; | |
192 | ||
193 | alen = int_array_len(a); | |
194 | qsort(a, alen, sizeof(int), freq_cmp); | |
195 | ||
196 | i = 0; | |
197 | j = 1; | |
198 | while (a[i] && a[j]) { | |
199 | if (a[i] == a[j]) { | |
200 | j++; | |
201 | continue; | |
202 | } | |
203 | a[++i] = a[j++]; | |
204 | } | |
205 | if (a[i]) | |
206 | i++; | |
207 | a[i] = 0; | |
208 | } | |
209 | ||
210 | ||
2c09af30 JM |
211 | /** |
212 | * wpa_supplicant_trigger_scan - Request driver to start a scan | |
213 | * @wpa_s: Pointer to wpa_supplicant data | |
214 | * @params: Scan parameters | |
215 | * Returns: 0 on success, -1 on failure | |
216 | */ | |
60b94c98 JM |
217 | int wpa_supplicant_trigger_scan(struct wpa_supplicant *wpa_s, |
218 | struct wpa_driver_scan_params *params) | |
219 | { | |
220 | int ret; | |
221 | ||
222 | wpa_supplicant_notify_scanning(wpa_s, 1); | |
223 | ||
17fbb751 | 224 | ret = wpa_drv_scan(wpa_s, params); |
60b94c98 JM |
225 | if (ret) { |
226 | wpa_supplicant_notify_scanning(wpa_s, 0); | |
227 | wpas_notify_scan_done(wpa_s, 0); | |
0b7a25c0 | 228 | } else { |
60b94c98 | 229 | wpa_s->scan_runs++; |
0b7a25c0 JM |
230 | wpa_s->normal_scans++; |
231 | } | |
60b94c98 JM |
232 | |
233 | return ret; | |
234 | } | |
235 | ||
236 | ||
6a90053c LC |
237 | static void |
238 | wpa_supplicant_delayed_sched_scan_timeout(void *eloop_ctx, void *timeout_ctx) | |
239 | { | |
240 | struct wpa_supplicant *wpa_s = eloop_ctx; | |
241 | ||
242 | wpa_dbg(wpa_s, MSG_DEBUG, "Starting delayed sched scan"); | |
243 | ||
244 | if (wpa_supplicant_req_sched_scan(wpa_s)) | |
245 | wpa_supplicant_req_scan(wpa_s, 0, 0); | |
246 | } | |
247 | ||
248 | ||
cbdf3507 LC |
249 | static void |
250 | wpa_supplicant_sched_scan_timeout(void *eloop_ctx, void *timeout_ctx) | |
251 | { | |
252 | struct wpa_supplicant *wpa_s = eloop_ctx; | |
253 | ||
254 | wpa_dbg(wpa_s, MSG_DEBUG, "Sched scan timeout - stopping it"); | |
255 | ||
256 | wpa_s->sched_scan_timed_out = 1; | |
257 | wpa_supplicant_cancel_sched_scan(wpa_s); | |
258 | } | |
259 | ||
260 | ||
261 | static int | |
262 | wpa_supplicant_start_sched_scan(struct wpa_supplicant *wpa_s, | |
263 | struct wpa_driver_scan_params *params, | |
264 | int interval) | |
265 | { | |
266 | int ret; | |
267 | ||
cbdf3507 LC |
268 | wpa_supplicant_notify_scanning(wpa_s, 1); |
269 | ret = wpa_drv_sched_scan(wpa_s, params, interval * 1000); | |
270 | if (ret) | |
271 | wpa_supplicant_notify_scanning(wpa_s, 0); | |
272 | else | |
273 | wpa_s->sched_scanning = 1; | |
274 | ||
275 | return ret; | |
276 | } | |
277 | ||
278 | ||
279 | static int wpa_supplicant_stop_sched_scan(struct wpa_supplicant *wpa_s) | |
280 | { | |
281 | int ret; | |
282 | ||
283 | ret = wpa_drv_stop_sched_scan(wpa_s); | |
284 | if (ret) { | |
285 | wpa_dbg(wpa_s, MSG_DEBUG, "stopping sched_scan failed!"); | |
286 | /* TODO: what to do if stopping fails? */ | |
287 | return -1; | |
288 | } | |
289 | ||
290 | return ret; | |
291 | } | |
292 | ||
293 | ||
3812464c JM |
294 | static struct wpa_driver_scan_filter * |
295 | wpa_supplicant_build_filter_ssids(struct wpa_config *conf, size_t *num_ssids) | |
296 | { | |
297 | struct wpa_driver_scan_filter *ssids; | |
298 | struct wpa_ssid *ssid; | |
299 | size_t count; | |
300 | ||
301 | *num_ssids = 0; | |
302 | if (!conf->filter_ssids) | |
303 | return NULL; | |
304 | ||
305 | for (count = 0, ssid = conf->ssid; ssid; ssid = ssid->next) { | |
306 | if (ssid->ssid && ssid->ssid_len) | |
307 | count++; | |
308 | } | |
309 | if (count == 0) | |
310 | return NULL; | |
311 | ssids = os_zalloc(count * sizeof(struct wpa_driver_scan_filter)); | |
312 | if (ssids == NULL) | |
313 | return NULL; | |
314 | ||
315 | for (ssid = conf->ssid; ssid; ssid = ssid->next) { | |
316 | if (!ssid->ssid || !ssid->ssid_len) | |
317 | continue; | |
318 | os_memcpy(ssids[*num_ssids].ssid, ssid->ssid, ssid->ssid_len); | |
319 | ssids[*num_ssids].ssid_len = ssid->ssid_len; | |
320 | (*num_ssids)++; | |
321 | } | |
322 | ||
323 | return ssids; | |
324 | } | |
325 | ||
326 | ||
5f738a21 LC |
327 | static void wpa_supplicant_optimize_freqs( |
328 | struct wpa_supplicant *wpa_s, struct wpa_driver_scan_params *params) | |
329 | { | |
330 | #ifdef CONFIG_P2P | |
331 | if (params->freqs == NULL && wpa_s->p2p_in_provisioning && | |
332 | wpa_s->go_params) { | |
333 | /* Optimize provisioning state scan based on GO information */ | |
334 | if (wpa_s->p2p_in_provisioning < 5 && | |
335 | wpa_s->go_params->freq > 0) { | |
336 | wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only GO " | |
337 | "preferred frequency %d MHz", | |
338 | wpa_s->go_params->freq); | |
339 | params->freqs = os_zalloc(2 * sizeof(int)); | |
340 | if (params->freqs) | |
341 | params->freqs[0] = wpa_s->go_params->freq; | |
342 | } else if (wpa_s->p2p_in_provisioning < 8 && | |
343 | wpa_s->go_params->freq_list[0]) { | |
344 | wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only common " | |
345 | "channels"); | |
346 | int_array_concat(¶ms->freqs, | |
347 | wpa_s->go_params->freq_list); | |
348 | if (params->freqs) | |
349 | int_array_sort_unique(params->freqs); | |
350 | } | |
351 | wpa_s->p2p_in_provisioning++; | |
352 | } | |
353 | #endif /* CONFIG_P2P */ | |
354 | ||
355 | #ifdef CONFIG_WPS | |
356 | if (params->freqs == NULL && wpa_s->after_wps && wpa_s->wps_freq) { | |
357 | /* | |
358 | * Optimize post-provisioning scan based on channel used | |
359 | * during provisioning. | |
360 | */ | |
361 | wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Scan only frequency %u MHz " | |
362 | "that was used during provisioning", wpa_s->wps_freq); | |
363 | params->freqs = os_zalloc(2 * sizeof(int)); | |
364 | if (params->freqs) | |
365 | params->freqs[0] = wpa_s->wps_freq; | |
366 | wpa_s->after_wps--; | |
367 | } | |
368 | ||
1e7fb4f1 JM |
369 | if (params->freqs == NULL && wpa_s->known_wps_freq && wpa_s->wps_freq) |
370 | { | |
371 | /* Optimize provisioning scan based on already known channel */ | |
372 | wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Scan only frequency %u MHz", | |
373 | wpa_s->wps_freq); | |
374 | params->freqs = os_zalloc(2 * sizeof(int)); | |
375 | if (params->freqs) | |
376 | params->freqs[0] = wpa_s->wps_freq; | |
377 | wpa_s->known_wps_freq = 0; /* only do this once */ | |
378 | } | |
5f738a21 LC |
379 | #endif /* CONFIG_WPS */ |
380 | } | |
381 | ||
382 | ||
46ee0427 JM |
383 | #ifdef CONFIG_INTERWORKING |
384 | static void wpas_add_interworking_elements(struct wpa_supplicant *wpa_s, | |
385 | struct wpabuf *buf) | |
386 | { | |
387 | if (wpa_s->conf->interworking == 0) | |
388 | return; | |
389 | ||
390 | wpabuf_put_u8(buf, WLAN_EID_EXT_CAPAB); | |
391 | wpabuf_put_u8(buf, 4); | |
392 | wpabuf_put_u8(buf, 0x00); | |
393 | wpabuf_put_u8(buf, 0x00); | |
394 | wpabuf_put_u8(buf, 0x00); | |
395 | wpabuf_put_u8(buf, 0x80); /* Bit 31 - Interworking */ | |
396 | ||
397 | wpabuf_put_u8(buf, WLAN_EID_INTERWORKING); | |
398 | wpabuf_put_u8(buf, is_zero_ether_addr(wpa_s->conf->hessid) ? 1 : | |
399 | 1 + ETH_ALEN); | |
11540c0b | 400 | wpabuf_put_u8(buf, wpa_s->conf->access_network_type); |
46ee0427 JM |
401 | /* No Venue Info */ |
402 | if (!is_zero_ether_addr(wpa_s->conf->hessid)) | |
403 | wpabuf_put_data(buf, wpa_s->conf->hessid, ETH_ALEN); | |
404 | } | |
405 | #endif /* CONFIG_INTERWORKING */ | |
406 | ||
407 | ||
a13e07ec | 408 | static struct wpabuf * wpa_supplicant_extra_ies(struct wpa_supplicant *wpa_s) |
6fc6879b | 409 | { |
46ee0427 | 410 | struct wpabuf *extra_ie = NULL; |
b01c18a8 | 411 | #ifdef CONFIG_WPS |
509a3972 | 412 | int wps = 0; |
f90c86d4 | 413 | enum wps_request_type req_type = WPS_REQ_ENROLLEE_INFO; |
46ee0427 JM |
414 | #endif /* CONFIG_WPS */ |
415 | ||
416 | #ifdef CONFIG_INTERWORKING | |
417 | if (wpa_s->conf->interworking && | |
418 | wpabuf_resize(&extra_ie, 100) == 0) | |
419 | wpas_add_interworking_elements(wpa_s, extra_ie); | |
420 | #endif /* CONFIG_INTERWORKING */ | |
5f738a21 | 421 | |
46ee0427 | 422 | #ifdef CONFIG_WPS |
5f738a21 LC |
423 | wps = wpas_wps_in_use(wpa_s, &req_type); |
424 | ||
425 | if (wps) { | |
46ee0427 | 426 | struct wpabuf *wps_ie; |
360182ed JM |
427 | wps_ie = wps_build_probe_req_ie(wps == 2 ? DEV_PW_PUSHBUTTON : |
428 | DEV_PW_DEFAULT, | |
429 | &wpa_s->wps->dev, | |
5f738a21 LC |
430 | wpa_s->wps->uuid, req_type, |
431 | 0, NULL); | |
432 | if (wps_ie) { | |
46ee0427 JM |
433 | if (wpabuf_resize(&extra_ie, wpabuf_len(wps_ie)) == 0) |
434 | wpabuf_put_buf(extra_ie, wps_ie); | |
435 | wpabuf_free(wps_ie); | |
5f738a21 LC |
436 | } |
437 | } | |
438 | ||
439 | #ifdef CONFIG_P2P | |
46ee0427 | 440 | if (wps) { |
5f738a21 | 441 | size_t ielen = p2p_scan_ie_buf_len(wpa_s->global->p2p); |
46ee0427 JM |
442 | if (wpabuf_resize(&extra_ie, ielen) == 0) |
443 | wpas_p2p_scan_ie(wpa_s, extra_ie); | |
5f738a21 LC |
444 | } |
445 | #endif /* CONFIG_P2P */ | |
446 | ||
b01c18a8 | 447 | #endif /* CONFIG_WPS */ |
5f738a21 | 448 | |
46ee0427 | 449 | return extra_ie; |
5f738a21 LC |
450 | } |
451 | ||
452 | ||
5cc70322 JM |
453 | #ifdef CONFIG_P2P |
454 | ||
455 | /* | |
456 | * Check whether there are any enabled networks or credentials that could be | |
457 | * used for a non-P2P connection. | |
458 | */ | |
459 | static int non_p2p_network_enabled(struct wpa_supplicant *wpa_s) | |
460 | { | |
461 | struct wpa_ssid *ssid; | |
462 | ||
463 | for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) { | |
464 | if (wpas_network_disabled(wpa_s, ssid)) | |
465 | continue; | |
466 | if (!ssid->p2p_group) | |
467 | return 1; | |
468 | } | |
469 | ||
470 | if (wpa_s->conf->cred && wpa_s->conf->interworking && | |
471 | wpa_s->conf->auto_interworking) | |
472 | return 1; | |
473 | ||
474 | return 0; | |
475 | } | |
476 | ||
477 | ||
478 | /* | |
479 | * Find the operating frequency of any other virtual interface that is using | |
480 | * the same radio concurrently. | |
481 | */ | |
482 | static int shared_vif_oper_freq(struct wpa_supplicant *wpa_s) | |
483 | { | |
484 | const char *rn, *rn2; | |
485 | struct wpa_supplicant *ifs; | |
486 | u8 bssid[ETH_ALEN]; | |
487 | ||
488 | if (!wpa_s->driver->get_radio_name) | |
489 | return -1; | |
490 | ||
491 | rn = wpa_s->driver->get_radio_name(wpa_s->drv_priv); | |
492 | if (rn == NULL || rn[0] == '\0') | |
493 | return -1; | |
494 | ||
495 | for (ifs = wpa_s->global->ifaces; ifs; ifs = ifs->next) { | |
496 | if (ifs == wpa_s || !ifs->driver->get_radio_name) | |
497 | continue; | |
498 | ||
499 | rn2 = ifs->driver->get_radio_name(ifs->drv_priv); | |
500 | if (!rn2 || os_strcmp(rn, rn2) != 0) | |
501 | continue; | |
502 | ||
503 | if (ifs->current_ssid == NULL || ifs->assoc_freq == 0) | |
504 | continue; | |
505 | ||
506 | if (ifs->current_ssid->mode == WPAS_MODE_AP || | |
507 | ifs->current_ssid->mode == WPAS_MODE_P2P_GO) | |
508 | return ifs->current_ssid->frequency; | |
509 | if (wpa_drv_get_bssid(ifs, bssid) == 0) | |
510 | return ifs->assoc_freq; | |
511 | } | |
512 | ||
513 | return 0; | |
514 | } | |
515 | ||
516 | #endif /* CONFIG_P2P */ | |
517 | ||
518 | ||
5f738a21 LC |
519 | static void wpa_supplicant_scan(void *eloop_ctx, void *timeout_ctx) |
520 | { | |
521 | struct wpa_supplicant *wpa_s = eloop_ctx; | |
522 | struct wpa_ssid *ssid; | |
4115303b JM |
523 | enum scan_req_type scan_req = NORMAL_SCAN_REQ; |
524 | int ret; | |
b9b12d02 | 525 | struct wpabuf *extra_ie = NULL; |
e76baaac | 526 | struct wpa_driver_scan_params params; |
7c865c68 | 527 | struct wpa_driver_scan_params *scan_params; |
e76baaac | 528 | size_t max_ssids; |
207ef3fb | 529 | enum wpa_states prev_state; |
6fc6879b | 530 | |
8401a6b0 | 531 | if (wpa_s->wpa_state == WPA_INTERFACE_DISABLED) { |
f049052b | 532 | wpa_dbg(wpa_s, MSG_DEBUG, "Skip scan - interface disabled"); |
8401a6b0 JM |
533 | return; |
534 | } | |
535 | ||
4115303b | 536 | if (wpa_s->disconnected && wpa_s->scan_req == NORMAL_SCAN_REQ) { |
ac06fb12 | 537 | wpa_dbg(wpa_s, MSG_DEBUG, "Disconnected - do not scan"); |
3180d7a2 | 538 | wpa_supplicant_set_state(wpa_s, WPA_DISCONNECTED); |
6fc6879b | 539 | return; |
3180d7a2 | 540 | } |
6fc6879b | 541 | |
349493bd | 542 | if (!wpa_supplicant_enabled_networks(wpa_s) && |
4115303b | 543 | wpa_s->scan_req == NORMAL_SCAN_REQ) { |
f049052b | 544 | wpa_dbg(wpa_s, MSG_DEBUG, "No enabled networks - do not scan"); |
6fc6879b | 545 | wpa_supplicant_set_state(wpa_s, WPA_INACTIVE); |
4c490780 JM |
546 | #ifdef CONFIG_P2P |
547 | wpa_s->sta_scan_pending = 0; | |
548 | #endif /* CONFIG_P2P */ | |
6fc6879b JM |
549 | return; |
550 | } | |
6fc6879b | 551 | |
c2a04078 JM |
552 | if (wpa_s->conf->ap_scan != 0 && |
553 | (wpa_s->drv_flags & WPA_DRIVER_FLAGS_WIRED)) { | |
f049052b BG |
554 | wpa_dbg(wpa_s, MSG_DEBUG, "Using wired authentication - " |
555 | "overriding ap_scan configuration"); | |
6fc6879b | 556 | wpa_s->conf->ap_scan = 0; |
8bac466b | 557 | wpas_notify_ap_scan_changed(wpa_s); |
6fc6879b JM |
558 | } |
559 | ||
560 | if (wpa_s->conf->ap_scan == 0) { | |
561 | wpa_supplicant_gen_assoc_event(wpa_s); | |
562 | return; | |
563 | } | |
564 | ||
303f60d3 JM |
565 | #ifdef CONFIG_P2P |
566 | if (wpas_p2p_in_progress(wpa_s)) { | |
99fcd404 JM |
567 | if (wpa_s->sta_scan_pending && |
568 | wpas_p2p_in_progress(wpa_s) == 2 && | |
e665ca9a | 569 | wpa_s->global->p2p_cb_on_scan_complete) { |
99fcd404 JM |
570 | wpa_dbg(wpa_s, MSG_DEBUG, "Process pending station " |
571 | "mode scan during P2P search"); | |
572 | } else { | |
303f60d3 JM |
573 | wpa_dbg(wpa_s, MSG_DEBUG, "Delay station mode scan " |
574 | "while P2P operation is in progress"); | |
99fcd404 | 575 | wpa_s->sta_scan_pending = 1; |
303f60d3 | 576 | wpa_supplicant_req_scan(wpa_s, 5, 0); |
99fcd404 | 577 | return; |
303f60d3 | 578 | } |
303f60d3 JM |
579 | } |
580 | #endif /* CONFIG_P2P */ | |
581 | ||
17fbb751 | 582 | if (wpa_s->conf->ap_scan == 2) |
e76baaac JM |
583 | max_ssids = 1; |
584 | else { | |
585 | max_ssids = wpa_s->max_scan_ssids; | |
586 | if (max_ssids > WPAS_MAX_SCAN_SSIDS) | |
587 | max_ssids = WPAS_MAX_SCAN_SSIDS; | |
588 | } | |
589 | ||
e76baaac | 590 | scan_req = wpa_s->scan_req; |
4115303b | 591 | wpa_s->scan_req = NORMAL_SCAN_REQ; |
e76baaac JM |
592 | |
593 | os_memset(¶ms, 0, sizeof(params)); | |
594 | ||
207ef3fb | 595 | prev_state = wpa_s->wpa_state; |
6fc6879b JM |
596 | if (wpa_s->wpa_state == WPA_DISCONNECTED || |
597 | wpa_s->wpa_state == WPA_INACTIVE) | |
598 | wpa_supplicant_set_state(wpa_s, WPA_SCANNING); | |
599 | ||
7c865c68 TB |
600 | /* |
601 | * If autoscan has set its own scanning parameters | |
602 | */ | |
603 | if (wpa_s->autoscan_params != NULL) { | |
604 | scan_params = wpa_s->autoscan_params; | |
605 | goto scan; | |
606 | } | |
607 | ||
4115303b | 608 | if (scan_req != MANUAL_SCAN_REQ && wpa_s->connect_without_scan) { |
7dcdcfd6 JM |
609 | for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) { |
610 | if (ssid == wpa_s->connect_without_scan) | |
611 | break; | |
612 | } | |
613 | wpa_s->connect_without_scan = NULL; | |
614 | if (ssid) { | |
615 | wpa_printf(MSG_DEBUG, "Start a pre-selected network " | |
616 | "without scan step"); | |
617 | wpa_supplicant_associate(wpa_s, NULL, ssid); | |
618 | return; | |
619 | } | |
620 | } | |
621 | ||
a21c05db | 622 | #ifdef CONFIG_P2P |
85ea132a JM |
623 | if ((wpa_s->p2p_in_provisioning || wpa_s->show_group_started) && |
624 | wpa_s->go_params) { | |
a21c05db | 625 | wpa_printf(MSG_DEBUG, "P2P: Use specific SSID for scan during " |
85ea132a | 626 | "P2P group formation"); |
a21c05db JM |
627 | params.ssids[0].ssid = wpa_s->go_params->ssid; |
628 | params.ssids[0].ssid_len = wpa_s->go_params->ssid_len; | |
629 | params.num_ssids = 1; | |
630 | goto ssid_list_set; | |
631 | } | |
632 | #endif /* CONFIG_P2P */ | |
633 | ||
e76baaac | 634 | /* Find the starting point from which to continue scanning */ |
6fc6879b | 635 | ssid = wpa_s->conf->ssid; |
ba2a573c | 636 | if (wpa_s->prev_scan_ssid != WILDCARD_SSID_SCAN) { |
6fc6879b JM |
637 | while (ssid) { |
638 | if (ssid == wpa_s->prev_scan_ssid) { | |
639 | ssid = ssid->next; | |
640 | break; | |
641 | } | |
642 | ssid = ssid->next; | |
643 | } | |
644 | } | |
6fc6879b | 645 | |
4115303b | 646 | if (scan_req != MANUAL_SCAN_REQ && wpa_s->conf->ap_scan == 2) { |
7dcdcfd6 | 647 | wpa_s->connect_without_scan = NULL; |
b3aa456b | 648 | wpa_s->prev_scan_wildcard = 0; |
e76baaac JM |
649 | wpa_supplicant_assoc_try(wpa_s, ssid); |
650 | return; | |
651 | } else if (wpa_s->conf->ap_scan == 2) { | |
6fc6879b | 652 | /* |
ba2a573c JM |
653 | * User-initiated scan request in ap_scan == 2; scan with |
654 | * wildcard SSID. | |
6fc6879b | 655 | */ |
e76baaac JM |
656 | ssid = NULL; |
657 | } else { | |
5be45e2e | 658 | struct wpa_ssid *start = ssid, *tssid; |
d3a98225 | 659 | int freqs_set = 0; |
e76baaac JM |
660 | if (ssid == NULL && max_ssids > 1) |
661 | ssid = wpa_s->conf->ssid; | |
662 | while (ssid) { | |
349493bd JM |
663 | if (!wpas_network_disabled(wpa_s, ssid) && |
664 | ssid->scan_ssid) { | |
e76baaac JM |
665 | wpa_hexdump_ascii(MSG_DEBUG, "Scan SSID", |
666 | ssid->ssid, ssid->ssid_len); | |
667 | params.ssids[params.num_ssids].ssid = | |
668 | ssid->ssid; | |
669 | params.ssids[params.num_ssids].ssid_len = | |
670 | ssid->ssid_len; | |
671 | params.num_ssids++; | |
672 | if (params.num_ssids + 1 >= max_ssids) | |
673 | break; | |
674 | } | |
675 | ssid = ssid->next; | |
676 | if (ssid == start) | |
677 | break; | |
678 | if (ssid == NULL && max_ssids > 1 && | |
679 | start != wpa_s->conf->ssid) | |
680 | ssid = wpa_s->conf->ssid; | |
6fc6879b | 681 | } |
d3a98225 | 682 | |
5be45e2e | 683 | for (tssid = wpa_s->conf->ssid; tssid; tssid = tssid->next) { |
349493bd | 684 | if (wpas_network_disabled(wpa_s, tssid)) |
d3a98225 | 685 | continue; |
5be45e2e | 686 | if ((params.freqs || !freqs_set) && tssid->scan_freq) { |
d3a98225 | 687 | int_array_concat(¶ms.freqs, |
5be45e2e | 688 | tssid->scan_freq); |
d3a98225 JM |
689 | } else { |
690 | os_free(params.freqs); | |
691 | params.freqs = NULL; | |
692 | } | |
693 | freqs_set = 1; | |
694 | } | |
695 | int_array_sort_unique(params.freqs); | |
6fc6879b JM |
696 | } |
697 | ||
b3aa456b ES |
698 | if (ssid && max_ssids == 1) { |
699 | /* | |
700 | * If the driver is limited to 1 SSID at a time interleave | |
701 | * wildcard SSID scans with specific SSID scans to avoid | |
702 | * waiting a long time for a wildcard scan. | |
703 | */ | |
704 | if (!wpa_s->prev_scan_wildcard) { | |
705 | params.ssids[0].ssid = NULL; | |
706 | params.ssids[0].ssid_len = 0; | |
707 | wpa_s->prev_scan_wildcard = 1; | |
708 | wpa_dbg(wpa_s, MSG_DEBUG, "Starting AP scan for " | |
709 | "wildcard SSID (Interleave with specific)"); | |
710 | } else { | |
711 | wpa_s->prev_scan_ssid = ssid; | |
712 | wpa_s->prev_scan_wildcard = 0; | |
713 | wpa_dbg(wpa_s, MSG_DEBUG, | |
714 | "Starting AP scan for specific SSID: %s", | |
715 | wpa_ssid_txt(ssid->ssid, ssid->ssid_len)); | |
e76baaac | 716 | } |
b3aa456b ES |
717 | } else if (ssid) { |
718 | /* max_ssids > 1 */ | |
719 | ||
720 | wpa_s->prev_scan_ssid = ssid; | |
721 | wpa_dbg(wpa_s, MSG_DEBUG, "Include wildcard SSID in " | |
722 | "the scan request"); | |
723 | params.num_ssids++; | |
e76baaac | 724 | } else { |
ba2a573c | 725 | wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN; |
e76baaac | 726 | params.num_ssids++; |
f049052b BG |
727 | wpa_dbg(wpa_s, MSG_DEBUG, "Starting AP scan for wildcard " |
728 | "SSID"); | |
6fc6879b | 729 | } |
a21c05db JM |
730 | #ifdef CONFIG_P2P |
731 | ssid_list_set: | |
732 | #endif /* CONFIG_P2P */ | |
6fc6879b | 733 | |
5f738a21 | 734 | wpa_supplicant_optimize_freqs(wpa_s, ¶ms); |
a13e07ec | 735 | extra_ie = wpa_supplicant_extra_ies(wpa_s); |
0e65037c | 736 | |
c923b8a5 JK |
737 | #ifdef CONFIG_HS20 |
738 | if (wpa_s->conf->hs20 && wpabuf_resize(&extra_ie, 6) == 0) | |
739 | wpas_hs20_add_indication(extra_ie); | |
740 | #endif /* CONFIG_HS20 */ | |
741 | ||
f47d639d | 742 | if (params.freqs == NULL && wpa_s->next_scan_freqs) { |
f049052b BG |
743 | wpa_dbg(wpa_s, MSG_DEBUG, "Optimize scan based on previously " |
744 | "generated frequency list"); | |
f47d639d JM |
745 | params.freqs = wpa_s->next_scan_freqs; |
746 | } else | |
747 | os_free(wpa_s->next_scan_freqs); | |
748 | wpa_s->next_scan_freqs = NULL; | |
749 | ||
3812464c JM |
750 | params.filter_ssids = wpa_supplicant_build_filter_ssids( |
751 | wpa_s->conf, ¶ms.num_filter_ssids); | |
46ee0427 JM |
752 | if (extra_ie) { |
753 | params.extra_ies = wpabuf_head(extra_ie); | |
754 | params.extra_ies_len = wpabuf_len(extra_ie); | |
755 | } | |
3812464c | 756 | |
d1dd48e3 | 757 | #ifdef CONFIG_P2P |
85ea132a JM |
758 | if (wpa_s->p2p_in_provisioning || |
759 | (wpa_s->show_group_started && wpa_s->go_params)) { | |
d1dd48e3 JM |
760 | /* |
761 | * The interface may not yet be in P2P mode, so we have to | |
762 | * explicitly request P2P probe to disable CCK rates. | |
763 | */ | |
764 | params.p2p_probe = 1; | |
765 | } | |
766 | #endif /* CONFIG_P2P */ | |
767 | ||
7c865c68 TB |
768 | scan_params = ¶ms; |
769 | ||
770 | scan: | |
5cc70322 JM |
771 | #ifdef CONFIG_P2P |
772 | /* | |
773 | * If the driver does not support multi-channel concurrency and a | |
774 | * virtual interface that shares the same radio with the wpa_s interface | |
775 | * is operating there may not be need to scan other channels apart from | |
776 | * the current operating channel on the other virtual interface. Filter | |
777 | * out other channels in case we are trying to find a connection for a | |
778 | * station interface when we are not configured to prefer station | |
779 | * connection and a concurrent operation is already in process. | |
780 | */ | |
4115303b | 781 | if (wpa_s->scan_for_connection && scan_req == NORMAL_SCAN_REQ && |
5cc70322 JM |
782 | !scan_params->freqs && !params.freqs && |
783 | wpas_is_p2p_prioritized(wpa_s) && | |
784 | !(wpa_s->drv_flags & WPA_DRIVER_FLAGS_MULTI_CHANNEL_CONCURRENT) && | |
785 | wpa_s->p2p_group_interface == NOT_P2P_GROUP_INTERFACE && | |
786 | non_p2p_network_enabled(wpa_s)) { | |
787 | int freq = shared_vif_oper_freq(wpa_s); | |
788 | if (freq > 0) { | |
789 | wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only the current " | |
790 | "operating channel (%d MHz) since driver does " | |
791 | "not support multi-channel concurrency", freq); | |
792 | params.freqs = os_zalloc(sizeof(int) * 2); | |
793 | if (params.freqs) | |
794 | params.freqs[0] = freq; | |
795 | scan_params->freqs = params.freqs; | |
796 | } | |
797 | } | |
798 | #endif /* CONFIG_P2P */ | |
799 | ||
7c865c68 | 800 | ret = wpa_supplicant_trigger_scan(wpa_s, scan_params); |
6fc6879b | 801 | |
46ee0427 | 802 | wpabuf_free(extra_ie); |
d3a98225 | 803 | os_free(params.freqs); |
3812464c | 804 | os_free(params.filter_ssids); |
ad08c363 | 805 | |
6fc6879b | 806 | if (ret) { |
f049052b | 807 | wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate AP scan"); |
207ef3fb JM |
808 | if (prev_state != wpa_s->wpa_state) |
809 | wpa_supplicant_set_state(wpa_s, prev_state); | |
23270cd8 JM |
810 | /* Restore scan_req since we will try to scan again */ |
811 | wpa_s->scan_req = scan_req; | |
1c4c9c50 | 812 | wpa_supplicant_req_scan(wpa_s, 1, 0); |
5cc70322 JM |
813 | } else { |
814 | wpa_s->scan_for_connection = 0; | |
d902a9c1 | 815 | } |
6fc6879b JM |
816 | } |
817 | ||
818 | ||
819 | /** | |
820 | * wpa_supplicant_req_scan - Schedule a scan for neighboring access points | |
821 | * @wpa_s: Pointer to wpa_supplicant data | |
822 | * @sec: Number of seconds after which to scan | |
823 | * @usec: Number of microseconds after which to scan | |
824 | * | |
825 | * This function is used to schedule a scan for neighboring access points after | |
826 | * the specified time. | |
827 | */ | |
828 | void wpa_supplicant_req_scan(struct wpa_supplicant *wpa_s, int sec, int usec) | |
829 | { | |
7e148849 DW |
830 | /* If there's at least one network that should be specifically scanned |
831 | * then don't cancel the scan and reschedule. Some drivers do | |
832 | * background scanning which generates frequent scan results, and that | |
833 | * causes the specific SSID scan to get continually pushed back and | |
834 | * never happen, which causes hidden APs to never get probe-scanned. | |
835 | */ | |
836 | if (eloop_is_timeout_registered(wpa_supplicant_scan, wpa_s, NULL) && | |
837 | wpa_s->conf->ap_scan == 1) { | |
838 | struct wpa_ssid *ssid = wpa_s->conf->ssid; | |
839 | ||
840 | while (ssid) { | |
349493bd JM |
841 | if (!wpas_network_disabled(wpa_s, ssid) && |
842 | ssid->scan_ssid) | |
7e148849 DW |
843 | break; |
844 | ssid = ssid->next; | |
845 | } | |
846 | if (ssid) { | |
f049052b | 847 | wpa_dbg(wpa_s, MSG_DEBUG, "Not rescheduling scan to " |
7e148849 DW |
848 | "ensure that specific SSID scans occur"); |
849 | return; | |
850 | } | |
851 | } | |
852 | ||
f049052b | 853 | wpa_dbg(wpa_s, MSG_DEBUG, "Setting scan request: %d sec %d usec", |
6fc6879b JM |
854 | sec, usec); |
855 | eloop_cancel_timeout(wpa_supplicant_scan, wpa_s, NULL); | |
856 | eloop_register_timeout(sec, usec, wpa_supplicant_scan, wpa_s, NULL); | |
857 | } | |
858 | ||
859 | ||
6a90053c LC |
860 | /** |
861 | * wpa_supplicant_delayed_sched_scan - Request a delayed scheduled scan | |
862 | * @wpa_s: Pointer to wpa_supplicant data | |
863 | * @sec: Number of seconds after which to scan | |
864 | * @usec: Number of microseconds after which to scan | |
2c09af30 | 865 | * Returns: 0 on success or -1 otherwise |
6a90053c LC |
866 | * |
867 | * This function is used to schedule periodic scans for neighboring | |
868 | * access points after the specified time. | |
869 | */ | |
870 | int wpa_supplicant_delayed_sched_scan(struct wpa_supplicant *wpa_s, | |
871 | int sec, int usec) | |
872 | { | |
873 | if (!wpa_s->sched_scan_supported) | |
874 | return -1; | |
875 | ||
876 | eloop_register_timeout(sec, usec, | |
877 | wpa_supplicant_delayed_sched_scan_timeout, | |
878 | wpa_s, NULL); | |
879 | ||
880 | return 0; | |
881 | } | |
882 | ||
883 | ||
cbdf3507 LC |
884 | /** |
885 | * wpa_supplicant_req_sched_scan - Start a periodic scheduled scan | |
886 | * @wpa_s: Pointer to wpa_supplicant data | |
2c09af30 | 887 | * Returns: 0 is sched_scan was started or -1 otherwise |
cbdf3507 LC |
888 | * |
889 | * This function is used to schedule periodic scans for neighboring | |
890 | * access points repeating the scan continuously. | |
891 | */ | |
892 | int wpa_supplicant_req_sched_scan(struct wpa_supplicant *wpa_s) | |
893 | { | |
894 | struct wpa_driver_scan_params params; | |
7c865c68 | 895 | struct wpa_driver_scan_params *scan_params; |
cbdf3507 | 896 | enum wpa_states prev_state; |
7c865c68 | 897 | struct wpa_ssid *ssid = NULL; |
a13e07ec | 898 | struct wpabuf *extra_ie = NULL; |
cbdf3507 | 899 | int ret; |
cbdf3507 | 900 | unsigned int max_sched_scan_ssids; |
76a5249e | 901 | int wildcard = 0; |
0b7a25c0 | 902 | int need_ssids; |
cbdf3507 LC |
903 | |
904 | if (!wpa_s->sched_scan_supported) | |
905 | return -1; | |
906 | ||
907 | if (wpa_s->max_sched_scan_ssids > WPAS_MAX_SCAN_SSIDS) | |
908 | max_sched_scan_ssids = WPAS_MAX_SCAN_SSIDS; | |
909 | else | |
910 | max_sched_scan_ssids = wpa_s->max_sched_scan_ssids; | |
54ddd743 | 911 | if (max_sched_scan_ssids < 1 || wpa_s->conf->disable_scan_offload) |
76a5249e | 912 | return -1; |
cbdf3507 | 913 | |
1966e3d1 ES |
914 | if (wpa_s->sched_scanning) { |
915 | wpa_dbg(wpa_s, MSG_DEBUG, "Already sched scanning"); | |
cbdf3507 | 916 | return 0; |
1966e3d1 | 917 | } |
cbdf3507 | 918 | |
0b7a25c0 JM |
919 | need_ssids = 0; |
920 | for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) { | |
349493bd | 921 | if (!wpas_network_disabled(wpa_s, ssid) && !ssid->scan_ssid) { |
0b7a25c0 JM |
922 | /* Use wildcard SSID to find this network */ |
923 | wildcard = 1; | |
349493bd JM |
924 | } else if (!wpas_network_disabled(wpa_s, ssid) && |
925 | ssid->ssid_len) | |
0b7a25c0 | 926 | need_ssids++; |
aa283ddd JM |
927 | |
928 | #ifdef CONFIG_WPS | |
349493bd | 929 | if (!wpas_network_disabled(wpa_s, ssid) && |
fea7c3a0 | 930 | ssid->key_mgmt == WPA_KEY_MGMT_WPS) { |
aa283ddd JM |
931 | /* |
932 | * Normal scan is more reliable and faster for WPS | |
933 | * operations and since these are for short periods of | |
934 | * time, the benefit of trying to use sched_scan would | |
935 | * be limited. | |
936 | */ | |
937 | wpa_dbg(wpa_s, MSG_DEBUG, "Use normal scan instead of " | |
938 | "sched_scan for WPS"); | |
939 | return -1; | |
940 | } | |
941 | #endif /* CONFIG_WPS */ | |
0b7a25c0 JM |
942 | } |
943 | if (wildcard) | |
944 | need_ssids++; | |
945 | ||
946 | if (wpa_s->normal_scans < 3 && | |
947 | (need_ssids <= wpa_s->max_scan_ssids || | |
948 | wpa_s->max_scan_ssids >= (int) max_sched_scan_ssids)) { | |
949 | /* | |
950 | * When normal scan can speed up operations, use that for the | |
951 | * first operations before starting the sched_scan to allow | |
952 | * user space sleep more. We do this only if the normal scan | |
953 | * has functionality that is suitable for this or if the | |
954 | * sched_scan does not have better support for multiple SSIDs. | |
955 | */ | |
956 | wpa_dbg(wpa_s, MSG_DEBUG, "Use normal scan instead of " | |
957 | "sched_scan for initial scans (normal_scans=%d)", | |
958 | wpa_s->normal_scans); | |
959 | return -1; | |
960 | } | |
961 | ||
cbdf3507 LC |
962 | os_memset(¶ms, 0, sizeof(params)); |
963 | ||
b59e6f26 LC |
964 | /* If we can't allocate space for the filters, we just don't filter */ |
965 | params.filter_ssids = os_zalloc(wpa_s->max_match_sets * | |
966 | sizeof(struct wpa_driver_scan_filter)); | |
967 | ||
cbdf3507 LC |
968 | prev_state = wpa_s->wpa_state; |
969 | if (wpa_s->wpa_state == WPA_DISCONNECTED || | |
970 | wpa_s->wpa_state == WPA_INACTIVE) | |
971 | wpa_supplicant_set_state(wpa_s, WPA_SCANNING); | |
972 | ||
7c865c68 TB |
973 | if (wpa_s->autoscan_params != NULL) { |
974 | scan_params = wpa_s->autoscan_params; | |
975 | goto scan; | |
976 | } | |
977 | ||
cbdf3507 LC |
978 | /* Find the starting point from which to continue scanning */ |
979 | ssid = wpa_s->conf->ssid; | |
980 | if (wpa_s->prev_sched_ssid) { | |
981 | while (ssid) { | |
982 | if (ssid == wpa_s->prev_sched_ssid) { | |
983 | ssid = ssid->next; | |
984 | break; | |
985 | } | |
986 | ssid = ssid->next; | |
987 | } | |
988 | } | |
989 | ||
990 | if (!ssid || !wpa_s->prev_sched_ssid) { | |
991 | wpa_dbg(wpa_s, MSG_DEBUG, "Beginning of SSID list"); | |
992 | ||
7c865c68 TB |
993 | if (wpa_s->sched_scan_interval == 0) |
994 | wpa_s->sched_scan_interval = 10; | |
cbdf3507 LC |
995 | wpa_s->sched_scan_timeout = max_sched_scan_ssids * 2; |
996 | wpa_s->first_sched_scan = 1; | |
997 | ssid = wpa_s->conf->ssid; | |
998 | wpa_s->prev_sched_ssid = ssid; | |
999 | } | |
1000 | ||
76a5249e JM |
1001 | if (wildcard) { |
1002 | wpa_dbg(wpa_s, MSG_DEBUG, "Add wildcard SSID to sched_scan"); | |
1003 | params.num_ssids++; | |
1004 | } | |
1005 | ||
cbdf3507 | 1006 | while (ssid) { |
349493bd | 1007 | if (wpas_network_disabled(wpa_s, ssid)) |
5edddf41 | 1008 | goto next; |
cbdf3507 | 1009 | |
fcd16847 JM |
1010 | if (params.num_filter_ssids < wpa_s->max_match_sets && |
1011 | params.filter_ssids && ssid->ssid && ssid->ssid_len) { | |
1966e3d1 ES |
1012 | wpa_dbg(wpa_s, MSG_DEBUG, "add to filter ssid: %s", |
1013 | wpa_ssid_txt(ssid->ssid, ssid->ssid_len)); | |
b59e6f26 LC |
1014 | os_memcpy(params.filter_ssids[params.num_filter_ssids].ssid, |
1015 | ssid->ssid, ssid->ssid_len); | |
1016 | params.filter_ssids[params.num_filter_ssids].ssid_len = | |
1017 | ssid->ssid_len; | |
1018 | params.num_filter_ssids++; | |
86b47aaf JM |
1019 | } else if (params.filter_ssids && ssid->ssid && ssid->ssid_len) |
1020 | { | |
1021 | wpa_dbg(wpa_s, MSG_DEBUG, "Not enough room for SSID " | |
1022 | "filter for sched_scan - drop filter"); | |
1023 | os_free(params.filter_ssids); | |
1024 | params.filter_ssids = NULL; | |
1025 | params.num_filter_ssids = 0; | |
b59e6f26 LC |
1026 | } |
1027 | ||
3f56f3a4 | 1028 | if (ssid->scan_ssid && ssid->ssid && ssid->ssid_len) { |
76a5249e JM |
1029 | if (params.num_ssids == max_sched_scan_ssids) |
1030 | break; /* only room for broadcast SSID */ | |
3f56f3a4 JM |
1031 | wpa_dbg(wpa_s, MSG_DEBUG, |
1032 | "add to active scan ssid: %s", | |
1966e3d1 | 1033 | wpa_ssid_txt(ssid->ssid, ssid->ssid_len)); |
cbdf3507 LC |
1034 | params.ssids[params.num_ssids].ssid = |
1035 | ssid->ssid; | |
1036 | params.ssids[params.num_ssids].ssid_len = | |
1037 | ssid->ssid_len; | |
1038 | params.num_ssids++; | |
b59e6f26 | 1039 | if (params.num_ssids >= max_sched_scan_ssids) { |
cbdf3507 | 1040 | wpa_s->prev_sched_ssid = ssid; |
b55aca46 JM |
1041 | do { |
1042 | ssid = ssid->next; | |
1043 | } while (ssid && | |
349493bd | 1044 | (wpas_network_disabled(wpa_s, ssid) || |
fea7c3a0 | 1045 | !ssid->scan_ssid)); |
cbdf3507 LC |
1046 | break; |
1047 | } | |
1048 | } | |
b59e6f26 | 1049 | |
5edddf41 | 1050 | next: |
cbdf3507 LC |
1051 | wpa_s->prev_sched_ssid = ssid; |
1052 | ssid = ssid->next; | |
1053 | } | |
1054 | ||
7c6a266c JM |
1055 | if (params.num_filter_ssids == 0) { |
1056 | os_free(params.filter_ssids); | |
1057 | params.filter_ssids = NULL; | |
1058 | } | |
1059 | ||
a13e07ec ES |
1060 | extra_ie = wpa_supplicant_extra_ies(wpa_s); |
1061 | if (extra_ie) { | |
1062 | params.extra_ies = wpabuf_head(extra_ie); | |
1063 | params.extra_ies_len = wpabuf_len(extra_ie); | |
1064 | } | |
cbdf3507 | 1065 | |
7c865c68 TB |
1066 | scan_params = ¶ms; |
1067 | ||
1068 | scan: | |
a8cb5a88 | 1069 | if (ssid || !wpa_s->first_sched_scan) { |
a8cb5a88 JM |
1070 | wpa_dbg(wpa_s, MSG_DEBUG, |
1071 | "Starting sched scan: interval %d timeout %d", | |
1072 | wpa_s->sched_scan_interval, wpa_s->sched_scan_timeout); | |
7d21a223 JM |
1073 | } else { |
1074 | wpa_dbg(wpa_s, MSG_DEBUG, | |
1075 | "Starting sched scan: interval %d (no timeout)", | |
1076 | wpa_s->sched_scan_interval); | |
a8cb5a88 | 1077 | } |
cbdf3507 | 1078 | |
7c865c68 | 1079 | ret = wpa_supplicant_start_sched_scan(wpa_s, scan_params, |
cbdf3507 | 1080 | wpa_s->sched_scan_interval); |
a13e07ec | 1081 | wpabuf_free(extra_ie); |
b59e6f26 | 1082 | os_free(params.filter_ssids); |
cbdf3507 LC |
1083 | if (ret) { |
1084 | wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate sched scan"); | |
1085 | if (prev_state != wpa_s->wpa_state) | |
1086 | wpa_supplicant_set_state(wpa_s, prev_state); | |
1087 | return ret; | |
1088 | } | |
1089 | ||
1090 | /* If we have more SSIDs to scan, add a timeout so we scan them too */ | |
1091 | if (ssid || !wpa_s->first_sched_scan) { | |
1092 | wpa_s->sched_scan_timed_out = 0; | |
1093 | eloop_register_timeout(wpa_s->sched_scan_timeout, 0, | |
1094 | wpa_supplicant_sched_scan_timeout, | |
1095 | wpa_s, NULL); | |
1096 | wpa_s->first_sched_scan = 0; | |
1097 | wpa_s->sched_scan_timeout /= 2; | |
1098 | wpa_s->sched_scan_interval *= 2; | |
1099 | } | |
1100 | ||
1101 | return 0; | |
1102 | } | |
1103 | ||
1104 | ||
6fc6879b JM |
1105 | /** |
1106 | * wpa_supplicant_cancel_scan - Cancel a scheduled scan request | |
1107 | * @wpa_s: Pointer to wpa_supplicant data | |
1108 | * | |
1109 | * This function is used to cancel a scan request scheduled with | |
1110 | * wpa_supplicant_req_scan(). | |
1111 | */ | |
1112 | void wpa_supplicant_cancel_scan(struct wpa_supplicant *wpa_s) | |
1113 | { | |
f049052b | 1114 | wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling scan request"); |
6fc6879b JM |
1115 | eloop_cancel_timeout(wpa_supplicant_scan, wpa_s, NULL); |
1116 | } | |
cb8564b1 DW |
1117 | |
1118 | ||
cbdf3507 LC |
1119 | /** |
1120 | * wpa_supplicant_cancel_sched_scan - Stop running scheduled scans | |
1121 | * @wpa_s: Pointer to wpa_supplicant data | |
1122 | * | |
1123 | * This function is used to stop a periodic scheduled scan. | |
1124 | */ | |
1125 | void wpa_supplicant_cancel_sched_scan(struct wpa_supplicant *wpa_s) | |
1126 | { | |
1127 | if (!wpa_s->sched_scanning) | |
1128 | return; | |
1129 | ||
1130 | wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling sched scan"); | |
1131 | eloop_cancel_timeout(wpa_supplicant_sched_scan_timeout, wpa_s, NULL); | |
1132 | wpa_supplicant_stop_sched_scan(wpa_s); | |
1133 | } | |
1134 | ||
1135 | ||
2c09af30 JM |
1136 | /** |
1137 | * wpa_supplicant_notify_scanning - Indicate possible scan state change | |
1138 | * @wpa_s: Pointer to wpa_supplicant data | |
1139 | * @scanning: Whether scanning is currently in progress | |
1140 | * | |
1141 | * This function is to generate scanning notifycations. It is called whenever | |
1142 | * there may have been a change in scanning (scan started, completed, stopped). | |
1143 | * wpas_notify_scanning() is called whenever the scanning state changed from the | |
1144 | * previously notified state. | |
1145 | */ | |
cb8564b1 DW |
1146 | void wpa_supplicant_notify_scanning(struct wpa_supplicant *wpa_s, |
1147 | int scanning) | |
1148 | { | |
1149 | if (wpa_s->scanning != scanning) { | |
1150 | wpa_s->scanning = scanning; | |
8bac466b | 1151 | wpas_notify_scanning(wpa_s); |
cb8564b1 DW |
1152 | } |
1153 | } | |
1154 | ||
9ba9fa07 JM |
1155 | |
1156 | static int wpa_scan_get_max_rate(const struct wpa_scan_res *res) | |
1157 | { | |
1158 | int rate = 0; | |
1159 | const u8 *ie; | |
1160 | int i; | |
1161 | ||
1162 | ie = wpa_scan_get_ie(res, WLAN_EID_SUPP_RATES); | |
1163 | for (i = 0; ie && i < ie[1]; i++) { | |
1164 | if ((ie[i + 2] & 0x7f) > rate) | |
1165 | rate = ie[i + 2] & 0x7f; | |
1166 | } | |
1167 | ||
1168 | ie = wpa_scan_get_ie(res, WLAN_EID_EXT_SUPP_RATES); | |
1169 | for (i = 0; ie && i < ie[1]; i++) { | |
1170 | if ((ie[i + 2] & 0x7f) > rate) | |
1171 | rate = ie[i + 2] & 0x7f; | |
1172 | } | |
1173 | ||
1174 | return rate; | |
1175 | } | |
1176 | ||
1177 | ||
2c09af30 JM |
1178 | /** |
1179 | * wpa_scan_get_ie - Fetch a specified information element from a scan result | |
1180 | * @res: Scan result entry | |
1181 | * @ie: Information element identitifier (WLAN_EID_*) | |
1182 | * Returns: Pointer to the information element (id field) or %NULL if not found | |
1183 | * | |
1184 | * This function returns the first matching information element in the scan | |
1185 | * result. | |
1186 | */ | |
d1f9c410 JM |
1187 | const u8 * wpa_scan_get_ie(const struct wpa_scan_res *res, u8 ie) |
1188 | { | |
1189 | const u8 *end, *pos; | |
1190 | ||
1191 | pos = (const u8 *) (res + 1); | |
1192 | end = pos + res->ie_len; | |
1193 | ||
1194 | while (pos + 1 < end) { | |
1195 | if (pos + 2 + pos[1] > end) | |
1196 | break; | |
1197 | if (pos[0] == ie) | |
1198 | return pos; | |
1199 | pos += 2 + pos[1]; | |
1200 | } | |
1201 | ||
1202 | return NULL; | |
1203 | } | |
1204 | ||
1205 | ||
2c09af30 JM |
1206 | /** |
1207 | * wpa_scan_get_vendor_ie - Fetch vendor information element from a scan result | |
1208 | * @res: Scan result entry | |
1209 | * @vendor_type: Vendor type (four octets starting the IE payload) | |
1210 | * Returns: Pointer to the information element (id field) or %NULL if not found | |
1211 | * | |
1212 | * This function returns the first matching information element in the scan | |
1213 | * result. | |
1214 | */ | |
9ba9fa07 JM |
1215 | const u8 * wpa_scan_get_vendor_ie(const struct wpa_scan_res *res, |
1216 | u32 vendor_type) | |
1217 | { | |
1218 | const u8 *end, *pos; | |
1219 | ||
1220 | pos = (const u8 *) (res + 1); | |
1221 | end = pos + res->ie_len; | |
1222 | ||
1223 | while (pos + 1 < end) { | |
1224 | if (pos + 2 + pos[1] > end) | |
1225 | break; | |
1226 | if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 && | |
1227 | vendor_type == WPA_GET_BE32(&pos[2])) | |
1228 | return pos; | |
1229 | pos += 2 + pos[1]; | |
1230 | } | |
1231 | ||
1232 | return NULL; | |
1233 | } | |
1234 | ||
1235 | ||
2c09af30 JM |
1236 | /** |
1237 | * wpa_scan_get_vendor_ie_multi - Fetch vendor IE data from a scan result | |
1238 | * @res: Scan result entry | |
1239 | * @vendor_type: Vendor type (four octets starting the IE payload) | |
1240 | * Returns: Pointer to the information element payload or %NULL if not found | |
1241 | * | |
1242 | * This function returns concatenated payload of possibly fragmented vendor | |
1243 | * specific information elements in the scan result. The caller is responsible | |
1244 | * for freeing the returned buffer. | |
1245 | */ | |
9ba9fa07 JM |
1246 | struct wpabuf * wpa_scan_get_vendor_ie_multi(const struct wpa_scan_res *res, |
1247 | u32 vendor_type) | |
1248 | { | |
1249 | struct wpabuf *buf; | |
1250 | const u8 *end, *pos; | |
1251 | ||
1252 | buf = wpabuf_alloc(res->ie_len); | |
1253 | if (buf == NULL) | |
1254 | return NULL; | |
1255 | ||
1256 | pos = (const u8 *) (res + 1); | |
1257 | end = pos + res->ie_len; | |
1258 | ||
54f489be JM |
1259 | while (pos + 1 < end) { |
1260 | if (pos + 2 + pos[1] > end) | |
1261 | break; | |
1262 | if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 && | |
1263 | vendor_type == WPA_GET_BE32(&pos[2])) | |
1264 | wpabuf_put_data(buf, pos + 2 + 4, pos[1] - 4); | |
1265 | pos += 2 + pos[1]; | |
1266 | } | |
1267 | ||
1268 | if (wpabuf_len(buf) == 0) { | |
1269 | wpabuf_free(buf); | |
1270 | buf = NULL; | |
1271 | } | |
1272 | ||
1273 | return buf; | |
1274 | } | |
1275 | ||
1276 | ||
577db0ae GM |
1277 | /* |
1278 | * Channels with a great SNR can operate at full rate. What is a great SNR? | |
1279 | * This doc https://supportforums.cisco.com/docs/DOC-12954 says, "the general | |
1280 | * rule of thumb is that any SNR above 20 is good." This one | |
1281 | * http://www.cisco.com/en/US/tech/tk722/tk809/technologies_q_and_a_item09186a00805e9a96.shtml#qa23 | |
1282 | * recommends 25 as a minimum SNR for 54 Mbps data rate. 30 is chosen here as a | |
1283 | * conservative value. | |
1284 | */ | |
1285 | #define GREAT_SNR 30 | |
1286 | ||
9ba9fa07 JM |
1287 | /* Compare function for sorting scan results. Return >0 if @b is considered |
1288 | * better. */ | |
1289 | static int wpa_scan_result_compar(const void *a, const void *b) | |
1290 | { | |
577db0ae GM |
1291 | #define IS_5GHZ(n) (n > 4000) |
1292 | #define MIN(a,b) a < b ? a : b | |
9ba9fa07 JM |
1293 | struct wpa_scan_res **_wa = (void *) a; |
1294 | struct wpa_scan_res **_wb = (void *) b; | |
1295 | struct wpa_scan_res *wa = *_wa; | |
1296 | struct wpa_scan_res *wb = *_wb; | |
1297 | int wpa_a, wpa_b, maxrate_a, maxrate_b; | |
577db0ae | 1298 | int snr_a, snr_b; |
9ba9fa07 JM |
1299 | |
1300 | /* WPA/WPA2 support preferred */ | |
1301 | wpa_a = wpa_scan_get_vendor_ie(wa, WPA_IE_VENDOR_TYPE) != NULL || | |
1302 | wpa_scan_get_ie(wa, WLAN_EID_RSN) != NULL; | |
1303 | wpa_b = wpa_scan_get_vendor_ie(wb, WPA_IE_VENDOR_TYPE) != NULL || | |
1304 | wpa_scan_get_ie(wb, WLAN_EID_RSN) != NULL; | |
1305 | ||
1306 | if (wpa_b && !wpa_a) | |
1307 | return 1; | |
1308 | if (!wpa_b && wpa_a) | |
1309 | return -1; | |
1310 | ||
1311 | /* privacy support preferred */ | |
1312 | if ((wa->caps & IEEE80211_CAP_PRIVACY) == 0 && | |
1313 | (wb->caps & IEEE80211_CAP_PRIVACY)) | |
1314 | return 1; | |
1315 | if ((wa->caps & IEEE80211_CAP_PRIVACY) && | |
1316 | (wb->caps & IEEE80211_CAP_PRIVACY) == 0) | |
1317 | return -1; | |
1318 | ||
577db0ae GM |
1319 | if ((wa->flags & wb->flags & WPA_SCAN_LEVEL_DBM) && |
1320 | !((wa->flags | wb->flags) & WPA_SCAN_NOISE_INVALID)) { | |
1321 | snr_a = MIN(wa->level - wa->noise, GREAT_SNR); | |
1322 | snr_b = MIN(wb->level - wb->noise, GREAT_SNR); | |
1323 | } else { | |
1324 | /* Not suitable information to calculate SNR, so use level */ | |
1325 | snr_a = wa->level; | |
1326 | snr_b = wb->level; | |
1327 | } | |
1328 | ||
577db0ae GM |
1329 | /* best/max rate preferred if SNR close enough */ |
1330 | if ((snr_a && snr_b && abs(snr_b - snr_a) < 5) || | |
9ba9fa07 JM |
1331 | (wa->qual && wb->qual && abs(wb->qual - wa->qual) < 10)) { |
1332 | maxrate_a = wpa_scan_get_max_rate(wa); | |
1333 | maxrate_b = wpa_scan_get_max_rate(wb); | |
1334 | if (maxrate_a != maxrate_b) | |
1335 | return maxrate_b - maxrate_a; | |
577db0ae GM |
1336 | if (IS_5GHZ(wa->freq) ^ IS_5GHZ(wb->freq)) |
1337 | return IS_5GHZ(wa->freq) ? -1 : 1; | |
9ba9fa07 JM |
1338 | } |
1339 | ||
1340 | /* use freq for channel preference */ | |
1341 | ||
577db0ae | 1342 | /* all things being equal, use SNR; if SNRs are |
9ba9fa07 JM |
1343 | * identical, use quality values since some drivers may only report |
1344 | * that value and leave the signal level zero */ | |
577db0ae | 1345 | if (snr_b == snr_a) |
9ba9fa07 | 1346 | return wb->qual - wa->qual; |
577db0ae GM |
1347 | return snr_b - snr_a; |
1348 | #undef MIN | |
1349 | #undef IS_5GHZ | |
9ba9fa07 JM |
1350 | } |
1351 | ||
1352 | ||
41e650ae JM |
1353 | #ifdef CONFIG_WPS |
1354 | /* Compare function for sorting scan results when searching a WPS AP for | |
1355 | * provisioning. Return >0 if @b is considered better. */ | |
1356 | static int wpa_scan_result_wps_compar(const void *a, const void *b) | |
1357 | { | |
1358 | struct wpa_scan_res **_wa = (void *) a; | |
1359 | struct wpa_scan_res **_wb = (void *) b; | |
1360 | struct wpa_scan_res *wa = *_wa; | |
1361 | struct wpa_scan_res *wb = *_wb; | |
1362 | int uses_wps_a, uses_wps_b; | |
1363 | struct wpabuf *wps_a, *wps_b; | |
1364 | int res; | |
1365 | ||
1366 | /* Optimization - check WPS IE existence before allocated memory and | |
1367 | * doing full reassembly. */ | |
1368 | uses_wps_a = wpa_scan_get_vendor_ie(wa, WPS_IE_VENDOR_TYPE) != NULL; | |
1369 | uses_wps_b = wpa_scan_get_vendor_ie(wb, WPS_IE_VENDOR_TYPE) != NULL; | |
1370 | if (uses_wps_a && !uses_wps_b) | |
1371 | return -1; | |
1372 | if (!uses_wps_a && uses_wps_b) | |
1373 | return 1; | |
1374 | ||
1375 | if (uses_wps_a && uses_wps_b) { | |
1376 | wps_a = wpa_scan_get_vendor_ie_multi(wa, WPS_IE_VENDOR_TYPE); | |
1377 | wps_b = wpa_scan_get_vendor_ie_multi(wb, WPS_IE_VENDOR_TYPE); | |
1378 | res = wps_ap_priority_compar(wps_a, wps_b); | |
1379 | wpabuf_free(wps_a); | |
1380 | wpabuf_free(wps_b); | |
1381 | if (res) | |
1382 | return res; | |
1383 | } | |
1384 | ||
1385 | /* | |
1386 | * Do not use current AP security policy as a sorting criteria during | |
1387 | * WPS provisioning step since the AP may get reconfigured at the | |
1388 | * completion of provisioning. | |
1389 | */ | |
1390 | ||
1391 | /* all things being equal, use signal level; if signal levels are | |
1392 | * identical, use quality values since some drivers may only report | |
1393 | * that value and leave the signal level zero */ | |
1394 | if (wb->level == wa->level) | |
1395 | return wb->qual - wa->qual; | |
1396 | return wb->level - wa->level; | |
1397 | } | |
1398 | #endif /* CONFIG_WPS */ | |
1399 | ||
1400 | ||
aa820e02 JM |
1401 | static void dump_scan_res(struct wpa_scan_results *scan_res) |
1402 | { | |
76202aed | 1403 | #ifndef CONFIG_NO_STDOUT_DEBUG |
aa820e02 JM |
1404 | size_t i; |
1405 | ||
1406 | if (scan_res->res == NULL || scan_res->num == 0) | |
1407 | return; | |
1408 | ||
1409 | wpa_printf(MSG_EXCESSIVE, "Sorted scan results"); | |
1410 | ||
1411 | for (i = 0; i < scan_res->num; i++) { | |
1412 | struct wpa_scan_res *r = scan_res->res[i]; | |
1cbe86e2 | 1413 | u8 *pos; |
aa820e02 JM |
1414 | if ((r->flags & (WPA_SCAN_LEVEL_DBM | WPA_SCAN_NOISE_INVALID)) |
1415 | == WPA_SCAN_LEVEL_DBM) { | |
1416 | int snr = r->level - r->noise; | |
1417 | wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d " | |
1418 | "noise=%d level=%d snr=%d%s flags=0x%x", | |
1419 | MAC2STR(r->bssid), r->freq, r->qual, | |
1420 | r->noise, r->level, snr, | |
1421 | snr >= GREAT_SNR ? "*" : "", r->flags); | |
1422 | } else { | |
1423 | wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d " | |
1424 | "noise=%d level=%d flags=0x%x", | |
1425 | MAC2STR(r->bssid), r->freq, r->qual, | |
1426 | r->noise, r->level, r->flags); | |
1427 | } | |
1cbe86e2 JM |
1428 | pos = (u8 *) (r + 1); |
1429 | if (r->ie_len) | |
1430 | wpa_hexdump(MSG_EXCESSIVE, "IEs", pos, r->ie_len); | |
1431 | pos += r->ie_len; | |
1432 | if (r->beacon_ie_len) | |
1433 | wpa_hexdump(MSG_EXCESSIVE, "Beacon IEs", | |
1434 | pos, r->beacon_ie_len); | |
aa820e02 | 1435 | } |
76202aed | 1436 | #endif /* CONFIG_NO_STDOUT_DEBUG */ |
aa820e02 JM |
1437 | } |
1438 | ||
1439 | ||
2c09af30 JM |
1440 | /** |
1441 | * wpa_supplicant_filter_bssid_match - Is the specified BSSID allowed | |
1442 | * @wpa_s: Pointer to wpa_supplicant data | |
1443 | * @bssid: BSSID to check | |
1444 | * Returns: 0 if the BSSID is filtered or 1 if not | |
1445 | * | |
1446 | * This function is used to filter out specific BSSIDs from scan reslts mainly | |
1447 | * for testing purposes (SET bssid_filter ctrl_iface command). | |
1448 | */ | |
d445a5cd JM |
1449 | int wpa_supplicant_filter_bssid_match(struct wpa_supplicant *wpa_s, |
1450 | const u8 *bssid) | |
1451 | { | |
1452 | size_t i; | |
1453 | ||
1454 | if (wpa_s->bssid_filter == NULL) | |
1455 | return 1; | |
1456 | ||
1457 | for (i = 0; i < wpa_s->bssid_filter_count; i++) { | |
1458 | if (os_memcmp(wpa_s->bssid_filter + i * ETH_ALEN, bssid, | |
1459 | ETH_ALEN) == 0) | |
1460 | return 1; | |
1461 | } | |
1462 | ||
1463 | return 0; | |
1464 | } | |
1465 | ||
1466 | ||
1467 | static void filter_scan_res(struct wpa_supplicant *wpa_s, | |
1468 | struct wpa_scan_results *res) | |
1469 | { | |
1470 | size_t i, j; | |
1471 | ||
1472 | if (wpa_s->bssid_filter == NULL) | |
1473 | return; | |
1474 | ||
1475 | for (i = 0, j = 0; i < res->num; i++) { | |
1476 | if (wpa_supplicant_filter_bssid_match(wpa_s, | |
1477 | res->res[i]->bssid)) { | |
1478 | res->res[j++] = res->res[i]; | |
1479 | } else { | |
1480 | os_free(res->res[i]); | |
1481 | res->res[i] = NULL; | |
1482 | } | |
1483 | } | |
1484 | ||
1485 | if (res->num != j) { | |
1486 | wpa_printf(MSG_DEBUG, "Filtered out %d scan results", | |
1487 | (int) (res->num - j)); | |
1488 | res->num = j; | |
1489 | } | |
1490 | } | |
1491 | ||
1492 | ||
9ba9fa07 JM |
1493 | /** |
1494 | * wpa_supplicant_get_scan_results - Get scan results | |
1495 | * @wpa_s: Pointer to wpa_supplicant data | |
1496 | * @info: Information about what was scanned or %NULL if not available | |
1497 | * @new_scan: Whether a new scan was performed | |
1498 | * Returns: Scan results, %NULL on failure | |
1499 | * | |
1500 | * This function request the current scan results from the driver and updates | |
1501 | * the local BSS list wpa_s->bss. The caller is responsible for freeing the | |
1502 | * results with wpa_scan_results_free(). | |
1503 | */ | |
1504 | struct wpa_scan_results * | |
1505 | wpa_supplicant_get_scan_results(struct wpa_supplicant *wpa_s, | |
1506 | struct scan_info *info, int new_scan) | |
1507 | { | |
1508 | struct wpa_scan_results *scan_res; | |
1509 | size_t i; | |
41e650ae | 1510 | int (*compar)(const void *, const void *) = wpa_scan_result_compar; |
9ba9fa07 | 1511 | |
17fbb751 | 1512 | scan_res = wpa_drv_get_scan_results2(wpa_s); |
9ba9fa07 | 1513 | if (scan_res == NULL) { |
f049052b | 1514 | wpa_dbg(wpa_s, MSG_DEBUG, "Failed to get scan results"); |
9ba9fa07 JM |
1515 | return NULL; |
1516 | } | |
d445a5cd | 1517 | filter_scan_res(wpa_s, scan_res); |
9ba9fa07 | 1518 | |
41e650ae JM |
1519 | #ifdef CONFIG_WPS |
1520 | if (wpas_wps_in_progress(wpa_s)) { | |
f049052b BG |
1521 | wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Order scan results with WPS " |
1522 | "provisioning rules"); | |
41e650ae JM |
1523 | compar = wpa_scan_result_wps_compar; |
1524 | } | |
1525 | #endif /* CONFIG_WPS */ | |
1526 | ||
9ba9fa07 | 1527 | qsort(scan_res->res, scan_res->num, sizeof(struct wpa_scan_res *), |
41e650ae | 1528 | compar); |
aa820e02 | 1529 | dump_scan_res(scan_res); |
9ba9fa07 JM |
1530 | |
1531 | wpa_bss_update_start(wpa_s); | |
1532 | for (i = 0; i < scan_res->num; i++) | |
1533 | wpa_bss_update_scan_res(wpa_s, scan_res->res[i]); | |
1534 | wpa_bss_update_end(wpa_s, info, new_scan); | |
1535 | ||
1536 | return scan_res; | |
1537 | } | |
1538 | ||
1539 | ||
2c09af30 JM |
1540 | /** |
1541 | * wpa_supplicant_update_scan_results - Update scan results from the driver | |
1542 | * @wpa_s: Pointer to wpa_supplicant data | |
1543 | * Returns: 0 on success, -1 on failure | |
1544 | * | |
1545 | * This function updates the BSS table within wpa_supplicant based on the | |
1546 | * currently available scan results from the driver without requesting a new | |
1547 | * scan. This is used in cases where the driver indicates an association | |
1548 | * (including roaming within ESS) and wpa_supplicant does not yet have the | |
1549 | * needed information to complete the connection (e.g., to perform validation | |
1550 | * steps in 4-way handshake). | |
1551 | */ | |
9ba9fa07 JM |
1552 | int wpa_supplicant_update_scan_results(struct wpa_supplicant *wpa_s) |
1553 | { | |
1554 | struct wpa_scan_results *scan_res; | |
1555 | scan_res = wpa_supplicant_get_scan_results(wpa_s, NULL, 0); | |
1556 | if (scan_res == NULL) | |
1557 | return -1; | |
1558 | wpa_scan_results_free(scan_res); | |
1559 | ||
1560 | return 0; | |
1561 | } |