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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" | |
66fe0f70 | 14 | #include "common/wpa_ctrl.h" |
6fc6879b JM |
15 | #include "config.h" |
16 | #include "wpa_supplicant_i.h" | |
2d5b792d | 17 | #include "driver_i.h" |
b01c18a8 | 18 | #include "wps_supplicant.h" |
0e65037c JM |
19 | #include "p2p_supplicant.h" |
20 | #include "p2p/p2p.h" | |
c923b8a5 | 21 | #include "hs20_supplicant.h" |
8bac466b | 22 | #include "notify.h" |
9ba9fa07 JM |
23 | #include "bss.h" |
24 | #include "scan.h" | |
6fc6879b JM |
25 | |
26 | ||
27 | static void wpa_supplicant_gen_assoc_event(struct wpa_supplicant *wpa_s) | |
28 | { | |
29 | struct wpa_ssid *ssid; | |
30 | union wpa_event_data data; | |
31 | ||
32 | ssid = wpa_supplicant_get_ssid(wpa_s); | |
33 | if (ssid == NULL) | |
34 | return; | |
35 | ||
8bac466b | 36 | if (wpa_s->current_ssid == NULL) { |
6fc6879b | 37 | wpa_s->current_ssid = ssid; |
8bac466b JM |
38 | if (wpa_s->current_ssid != NULL) |
39 | wpas_notify_network_changed(wpa_s); | |
40 | } | |
6fc6879b | 41 | wpa_supplicant_initiate_eapol(wpa_s); |
f049052b BG |
42 | wpa_dbg(wpa_s, MSG_DEBUG, "Already associated with a configured " |
43 | "network - generating associated event"); | |
6fc6879b JM |
44 | os_memset(&data, 0, sizeof(data)); |
45 | wpa_supplicant_event(wpa_s, EVENT_ASSOC, &data); | |
46 | } | |
47 | ||
48 | ||
ad08c363 | 49 | #ifdef CONFIG_WPS |
5f738a21 | 50 | static int wpas_wps_in_use(struct wpa_supplicant *wpa_s, |
f90c86d4 | 51 | enum wps_request_type *req_type) |
ad08c363 JM |
52 | { |
53 | struct wpa_ssid *ssid; | |
54 | int wps = 0; | |
ad08c363 | 55 | |
5f738a21 | 56 | for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) { |
ad08c363 JM |
57 | if (!(ssid->key_mgmt & WPA_KEY_MGMT_WPS)) |
58 | continue; | |
59 | ||
60 | wps = 1; | |
b01c18a8 | 61 | *req_type = wpas_wps_get_req_type(ssid); |
ad08c363 JM |
62 | if (!ssid->eap.phase1) |
63 | continue; | |
64 | ||
ad08c363 JM |
65 | if (os_strstr(ssid->eap.phase1, "pbc=1")) |
66 | return 2; | |
67 | } | |
68 | ||
5f738a21 | 69 | #ifdef CONFIG_P2P |
7a808c7e JM |
70 | if (!wpa_s->global->p2p_disabled && wpa_s->global->p2p && |
71 | !wpa_s->conf->p2p_disabled) { | |
b21ff9cb JM |
72 | wpa_s->wps->dev.p2p = 1; |
73 | if (!wps) { | |
74 | wps = 1; | |
75 | *req_type = WPS_REQ_ENROLLEE_INFO; | |
76 | } | |
5f738a21 LC |
77 | } |
78 | #endif /* CONFIG_P2P */ | |
79 | ||
ad08c363 JM |
80 | return wps; |
81 | } | |
82 | #endif /* CONFIG_WPS */ | |
83 | ||
e76baaac | 84 | |
2c09af30 JM |
85 | /** |
86 | * wpa_supplicant_enabled_networks - Check whether there are enabled networks | |
87 | * @wpa_s: Pointer to wpa_supplicant data | |
88 | * Returns: 0 if no networks are enabled, >0 if networks are enabled | |
89 | * | |
90 | * This function is used to figure out whether any networks (or Interworking | |
91 | * with enabled credentials and auto_interworking) are present in the current | |
92 | * configuration. | |
93 | */ | |
349493bd | 94 | int wpa_supplicant_enabled_networks(struct wpa_supplicant *wpa_s) |
e76baaac | 95 | { |
349493bd | 96 | struct wpa_ssid *ssid = wpa_s->conf->ssid; |
d4534bde | 97 | int count = 0, disabled = 0; |
e76baaac | 98 | while (ssid) { |
349493bd | 99 | if (!wpas_network_disabled(wpa_s, ssid)) |
5471c343 | 100 | count++; |
d4534bde JM |
101 | else |
102 | disabled++; | |
e76baaac JM |
103 | ssid = ssid->next; |
104 | } | |
4d5bda5f JM |
105 | if (wpa_s->conf->cred && wpa_s->conf->interworking && |
106 | wpa_s->conf->auto_interworking) | |
107 | count++; | |
d4534bde JM |
108 | if (count == 0 && disabled > 0) { |
109 | wpa_dbg(wpa_s, MSG_DEBUG, "No enabled networks (%d disabled " | |
110 | "networks)", disabled); | |
111 | } | |
5471c343 | 112 | return count; |
e76baaac JM |
113 | } |
114 | ||
115 | ||
116 | static void wpa_supplicant_assoc_try(struct wpa_supplicant *wpa_s, | |
117 | struct wpa_ssid *ssid) | |
118 | { | |
119 | while (ssid) { | |
349493bd | 120 | if (!wpas_network_disabled(wpa_s, ssid)) |
e76baaac JM |
121 | break; |
122 | ssid = ssid->next; | |
123 | } | |
124 | ||
125 | /* ap_scan=2 mode - try to associate with each SSID. */ | |
126 | if (ssid == NULL) { | |
f049052b BG |
127 | wpa_dbg(wpa_s, MSG_DEBUG, "wpa_supplicant_assoc_try: Reached " |
128 | "end of scan list - go back to beginning"); | |
ba2a573c | 129 | wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN; |
e76baaac JM |
130 | wpa_supplicant_req_scan(wpa_s, 0, 0); |
131 | return; | |
132 | } | |
133 | if (ssid->next) { | |
134 | /* Continue from the next SSID on the next attempt. */ | |
135 | wpa_s->prev_scan_ssid = ssid; | |
136 | } else { | |
137 | /* Start from the beginning of the SSID list. */ | |
ba2a573c | 138 | wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN; |
e76baaac JM |
139 | } |
140 | wpa_supplicant_associate(wpa_s, NULL, ssid); | |
141 | } | |
142 | ||
143 | ||
d3a98225 JM |
144 | static int int_array_len(const int *a) |
145 | { | |
146 | int i; | |
147 | for (i = 0; a && a[i]; i++) | |
148 | ; | |
149 | return i; | |
150 | } | |
151 | ||
152 | ||
153 | static void int_array_concat(int **res, const int *a) | |
154 | { | |
155 | int reslen, alen, i; | |
156 | int *n; | |
157 | ||
158 | reslen = int_array_len(*res); | |
159 | alen = int_array_len(a); | |
160 | ||
067ffa26 | 161 | n = os_realloc_array(*res, reslen + alen + 1, sizeof(int)); |
d3a98225 JM |
162 | if (n == NULL) { |
163 | os_free(*res); | |
164 | *res = NULL; | |
e6c0ebff | 165 | return; |
d3a98225 JM |
166 | } |
167 | for (i = 0; i <= alen; i++) | |
168 | n[reslen + i] = a[i]; | |
169 | *res = n; | |
170 | } | |
171 | ||
172 | ||
173 | static int freq_cmp(const void *a, const void *b) | |
174 | { | |
175 | int _a = *(int *) a; | |
176 | int _b = *(int *) b; | |
177 | ||
178 | if (_a == 0) | |
179 | return 1; | |
180 | if (_b == 0) | |
181 | return -1; | |
182 | return _a - _b; | |
183 | } | |
184 | ||
185 | ||
186 | static void int_array_sort_unique(int *a) | |
187 | { | |
188 | int alen; | |
189 | int i, j; | |
190 | ||
191 | if (a == NULL) | |
192 | return; | |
193 | ||
194 | alen = int_array_len(a); | |
195 | qsort(a, alen, sizeof(int), freq_cmp); | |
196 | ||
197 | i = 0; | |
198 | j = 1; | |
199 | while (a[i] && a[j]) { | |
200 | if (a[i] == a[j]) { | |
201 | j++; | |
202 | continue; | |
203 | } | |
204 | a[++i] = a[j++]; | |
205 | } | |
206 | if (a[i]) | |
207 | i++; | |
208 | a[i] = 0; | |
209 | } | |
210 | ||
211 | ||
2c09af30 JM |
212 | /** |
213 | * wpa_supplicant_trigger_scan - Request driver to start a scan | |
214 | * @wpa_s: Pointer to wpa_supplicant data | |
215 | * @params: Scan parameters | |
216 | * Returns: 0 on success, -1 on failure | |
217 | */ | |
60b94c98 JM |
218 | int wpa_supplicant_trigger_scan(struct wpa_supplicant *wpa_s, |
219 | struct wpa_driver_scan_params *params) | |
220 | { | |
221 | int ret; | |
222 | ||
223 | wpa_supplicant_notify_scanning(wpa_s, 1); | |
224 | ||
17fbb751 | 225 | ret = wpa_drv_scan(wpa_s, params); |
60b94c98 JM |
226 | if (ret) { |
227 | wpa_supplicant_notify_scanning(wpa_s, 0); | |
228 | wpas_notify_scan_done(wpa_s, 0); | |
0b7a25c0 | 229 | } else { |
4342326f | 230 | os_get_time(&wpa_s->scan_trigger_time); |
60b94c98 | 231 | wpa_s->scan_runs++; |
0b7a25c0 JM |
232 | wpa_s->normal_scans++; |
233 | } | |
60b94c98 JM |
234 | |
235 | return ret; | |
236 | } | |
237 | ||
238 | ||
6a90053c LC |
239 | static void |
240 | wpa_supplicant_delayed_sched_scan_timeout(void *eloop_ctx, void *timeout_ctx) | |
241 | { | |
242 | struct wpa_supplicant *wpa_s = eloop_ctx; | |
243 | ||
244 | wpa_dbg(wpa_s, MSG_DEBUG, "Starting delayed sched scan"); | |
245 | ||
246 | if (wpa_supplicant_req_sched_scan(wpa_s)) | |
247 | wpa_supplicant_req_scan(wpa_s, 0, 0); | |
248 | } | |
249 | ||
250 | ||
cbdf3507 LC |
251 | static void |
252 | wpa_supplicant_sched_scan_timeout(void *eloop_ctx, void *timeout_ctx) | |
253 | { | |
254 | struct wpa_supplicant *wpa_s = eloop_ctx; | |
255 | ||
256 | wpa_dbg(wpa_s, MSG_DEBUG, "Sched scan timeout - stopping it"); | |
257 | ||
258 | wpa_s->sched_scan_timed_out = 1; | |
259 | wpa_supplicant_cancel_sched_scan(wpa_s); | |
260 | } | |
261 | ||
262 | ||
263 | static int | |
264 | wpa_supplicant_start_sched_scan(struct wpa_supplicant *wpa_s, | |
265 | struct wpa_driver_scan_params *params, | |
266 | int interval) | |
267 | { | |
268 | int ret; | |
269 | ||
cbdf3507 LC |
270 | wpa_supplicant_notify_scanning(wpa_s, 1); |
271 | ret = wpa_drv_sched_scan(wpa_s, params, interval * 1000); | |
272 | if (ret) | |
273 | wpa_supplicant_notify_scanning(wpa_s, 0); | |
274 | else | |
275 | wpa_s->sched_scanning = 1; | |
276 | ||
277 | return ret; | |
278 | } | |
279 | ||
280 | ||
281 | static int wpa_supplicant_stop_sched_scan(struct wpa_supplicant *wpa_s) | |
282 | { | |
283 | int ret; | |
284 | ||
285 | ret = wpa_drv_stop_sched_scan(wpa_s); | |
286 | if (ret) { | |
287 | wpa_dbg(wpa_s, MSG_DEBUG, "stopping sched_scan failed!"); | |
288 | /* TODO: what to do if stopping fails? */ | |
289 | return -1; | |
290 | } | |
291 | ||
292 | return ret; | |
293 | } | |
294 | ||
295 | ||
3812464c JM |
296 | static struct wpa_driver_scan_filter * |
297 | wpa_supplicant_build_filter_ssids(struct wpa_config *conf, size_t *num_ssids) | |
298 | { | |
299 | struct wpa_driver_scan_filter *ssids; | |
300 | struct wpa_ssid *ssid; | |
301 | size_t count; | |
302 | ||
303 | *num_ssids = 0; | |
304 | if (!conf->filter_ssids) | |
305 | return NULL; | |
306 | ||
307 | for (count = 0, ssid = conf->ssid; ssid; ssid = ssid->next) { | |
308 | if (ssid->ssid && ssid->ssid_len) | |
309 | count++; | |
310 | } | |
311 | if (count == 0) | |
312 | return NULL; | |
313 | ssids = os_zalloc(count * sizeof(struct wpa_driver_scan_filter)); | |
314 | if (ssids == NULL) | |
315 | return NULL; | |
316 | ||
317 | for (ssid = conf->ssid; ssid; ssid = ssid->next) { | |
318 | if (!ssid->ssid || !ssid->ssid_len) | |
319 | continue; | |
320 | os_memcpy(ssids[*num_ssids].ssid, ssid->ssid, ssid->ssid_len); | |
321 | ssids[*num_ssids].ssid_len = ssid->ssid_len; | |
322 | (*num_ssids)++; | |
323 | } | |
324 | ||
325 | return ssids; | |
326 | } | |
327 | ||
328 | ||
5f738a21 LC |
329 | static void wpa_supplicant_optimize_freqs( |
330 | struct wpa_supplicant *wpa_s, struct wpa_driver_scan_params *params) | |
331 | { | |
332 | #ifdef CONFIG_P2P | |
333 | if (params->freqs == NULL && wpa_s->p2p_in_provisioning && | |
334 | wpa_s->go_params) { | |
335 | /* Optimize provisioning state scan based on GO information */ | |
336 | if (wpa_s->p2p_in_provisioning < 5 && | |
337 | wpa_s->go_params->freq > 0) { | |
338 | wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only GO " | |
339 | "preferred frequency %d MHz", | |
340 | wpa_s->go_params->freq); | |
341 | params->freqs = os_zalloc(2 * sizeof(int)); | |
342 | if (params->freqs) | |
343 | params->freqs[0] = wpa_s->go_params->freq; | |
344 | } else if (wpa_s->p2p_in_provisioning < 8 && | |
345 | wpa_s->go_params->freq_list[0]) { | |
346 | wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only common " | |
347 | "channels"); | |
348 | int_array_concat(¶ms->freqs, | |
349 | wpa_s->go_params->freq_list); | |
350 | if (params->freqs) | |
351 | int_array_sort_unique(params->freqs); | |
352 | } | |
353 | wpa_s->p2p_in_provisioning++; | |
354 | } | |
355 | #endif /* CONFIG_P2P */ | |
356 | ||
357 | #ifdef CONFIG_WPS | |
358 | if (params->freqs == NULL && wpa_s->after_wps && wpa_s->wps_freq) { | |
359 | /* | |
360 | * Optimize post-provisioning scan based on channel used | |
361 | * during provisioning. | |
362 | */ | |
363 | wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Scan only frequency %u MHz " | |
364 | "that was used during provisioning", wpa_s->wps_freq); | |
365 | params->freqs = os_zalloc(2 * sizeof(int)); | |
366 | if (params->freqs) | |
367 | params->freqs[0] = wpa_s->wps_freq; | |
368 | wpa_s->after_wps--; | |
369 | } | |
370 | ||
1e7fb4f1 JM |
371 | if (params->freqs == NULL && wpa_s->known_wps_freq && wpa_s->wps_freq) |
372 | { | |
373 | /* Optimize provisioning scan based on already known channel */ | |
374 | wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Scan only frequency %u MHz", | |
375 | wpa_s->wps_freq); | |
376 | params->freqs = os_zalloc(2 * sizeof(int)); | |
377 | if (params->freqs) | |
378 | params->freqs[0] = wpa_s->wps_freq; | |
379 | wpa_s->known_wps_freq = 0; /* only do this once */ | |
380 | } | |
5f738a21 LC |
381 | #endif /* CONFIG_WPS */ |
382 | } | |
383 | ||
384 | ||
46ee0427 JM |
385 | #ifdef CONFIG_INTERWORKING |
386 | static void wpas_add_interworking_elements(struct wpa_supplicant *wpa_s, | |
387 | struct wpabuf *buf) | |
388 | { | |
389 | if (wpa_s->conf->interworking == 0) | |
390 | return; | |
391 | ||
392 | wpabuf_put_u8(buf, WLAN_EID_EXT_CAPAB); | |
393 | wpabuf_put_u8(buf, 4); | |
394 | wpabuf_put_u8(buf, 0x00); | |
395 | wpabuf_put_u8(buf, 0x00); | |
396 | wpabuf_put_u8(buf, 0x00); | |
397 | wpabuf_put_u8(buf, 0x80); /* Bit 31 - Interworking */ | |
398 | ||
399 | wpabuf_put_u8(buf, WLAN_EID_INTERWORKING); | |
400 | wpabuf_put_u8(buf, is_zero_ether_addr(wpa_s->conf->hessid) ? 1 : | |
401 | 1 + ETH_ALEN); | |
11540c0b | 402 | wpabuf_put_u8(buf, wpa_s->conf->access_network_type); |
46ee0427 JM |
403 | /* No Venue Info */ |
404 | if (!is_zero_ether_addr(wpa_s->conf->hessid)) | |
405 | wpabuf_put_data(buf, wpa_s->conf->hessid, ETH_ALEN); | |
406 | } | |
407 | #endif /* CONFIG_INTERWORKING */ | |
408 | ||
409 | ||
a13e07ec | 410 | static struct wpabuf * wpa_supplicant_extra_ies(struct wpa_supplicant *wpa_s) |
6fc6879b | 411 | { |
46ee0427 | 412 | struct wpabuf *extra_ie = NULL; |
b01c18a8 | 413 | #ifdef CONFIG_WPS |
509a3972 | 414 | int wps = 0; |
f90c86d4 | 415 | enum wps_request_type req_type = WPS_REQ_ENROLLEE_INFO; |
46ee0427 JM |
416 | #endif /* CONFIG_WPS */ |
417 | ||
418 | #ifdef CONFIG_INTERWORKING | |
419 | if (wpa_s->conf->interworking && | |
420 | wpabuf_resize(&extra_ie, 100) == 0) | |
421 | wpas_add_interworking_elements(wpa_s, extra_ie); | |
422 | #endif /* CONFIG_INTERWORKING */ | |
5f738a21 | 423 | |
46ee0427 | 424 | #ifdef CONFIG_WPS |
5f738a21 LC |
425 | wps = wpas_wps_in_use(wpa_s, &req_type); |
426 | ||
427 | if (wps) { | |
46ee0427 | 428 | struct wpabuf *wps_ie; |
360182ed JM |
429 | wps_ie = wps_build_probe_req_ie(wps == 2 ? DEV_PW_PUSHBUTTON : |
430 | DEV_PW_DEFAULT, | |
431 | &wpa_s->wps->dev, | |
5f738a21 LC |
432 | wpa_s->wps->uuid, req_type, |
433 | 0, NULL); | |
434 | if (wps_ie) { | |
46ee0427 JM |
435 | if (wpabuf_resize(&extra_ie, wpabuf_len(wps_ie)) == 0) |
436 | wpabuf_put_buf(extra_ie, wps_ie); | |
437 | wpabuf_free(wps_ie); | |
5f738a21 LC |
438 | } |
439 | } | |
440 | ||
441 | #ifdef CONFIG_P2P | |
46ee0427 | 442 | if (wps) { |
5f738a21 | 443 | size_t ielen = p2p_scan_ie_buf_len(wpa_s->global->p2p); |
46ee0427 JM |
444 | if (wpabuf_resize(&extra_ie, ielen) == 0) |
445 | wpas_p2p_scan_ie(wpa_s, extra_ie); | |
5f738a21 LC |
446 | } |
447 | #endif /* CONFIG_P2P */ | |
448 | ||
b01c18a8 | 449 | #endif /* CONFIG_WPS */ |
5f738a21 | 450 | |
0f105f9e JM |
451 | #ifdef CONFIG_HS20 |
452 | if (wpa_s->conf->hs20 && wpabuf_resize(&extra_ie, 7) == 0) | |
453 | wpas_hs20_add_indication(extra_ie); | |
454 | #endif /* CONFIG_HS20 */ | |
455 | ||
46ee0427 | 456 | return extra_ie; |
5f738a21 LC |
457 | } |
458 | ||
459 | ||
5cc70322 JM |
460 | #ifdef CONFIG_P2P |
461 | ||
462 | /* | |
463 | * Check whether there are any enabled networks or credentials that could be | |
464 | * used for a non-P2P connection. | |
465 | */ | |
466 | static int non_p2p_network_enabled(struct wpa_supplicant *wpa_s) | |
467 | { | |
468 | struct wpa_ssid *ssid; | |
469 | ||
470 | for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) { | |
471 | if (wpas_network_disabled(wpa_s, ssid)) | |
472 | continue; | |
473 | if (!ssid->p2p_group) | |
474 | return 1; | |
475 | } | |
476 | ||
477 | if (wpa_s->conf->cred && wpa_s->conf->interworking && | |
478 | wpa_s->conf->auto_interworking) | |
479 | return 1; | |
480 | ||
481 | return 0; | |
482 | } | |
483 | ||
6124e858 | 484 | #endif /* CONFIG_P2P */ |
5cc70322 JM |
485 | |
486 | /* | |
487 | * Find the operating frequency of any other virtual interface that is using | |
488 | * the same radio concurrently. | |
489 | */ | |
490 | static int shared_vif_oper_freq(struct wpa_supplicant *wpa_s) | |
491 | { | |
492 | const char *rn, *rn2; | |
493 | struct wpa_supplicant *ifs; | |
494 | u8 bssid[ETH_ALEN]; | |
495 | ||
496 | if (!wpa_s->driver->get_radio_name) | |
497 | return -1; | |
498 | ||
499 | rn = wpa_s->driver->get_radio_name(wpa_s->drv_priv); | |
500 | if (rn == NULL || rn[0] == '\0') | |
501 | return -1; | |
502 | ||
503 | for (ifs = wpa_s->global->ifaces; ifs; ifs = ifs->next) { | |
504 | if (ifs == wpa_s || !ifs->driver->get_radio_name) | |
505 | continue; | |
506 | ||
507 | rn2 = ifs->driver->get_radio_name(ifs->drv_priv); | |
508 | if (!rn2 || os_strcmp(rn, rn2) != 0) | |
509 | continue; | |
510 | ||
511 | if (ifs->current_ssid == NULL || ifs->assoc_freq == 0) | |
512 | continue; | |
513 | ||
514 | if (ifs->current_ssid->mode == WPAS_MODE_AP || | |
515 | ifs->current_ssid->mode == WPAS_MODE_P2P_GO) | |
516 | return ifs->current_ssid->frequency; | |
517 | if (wpa_drv_get_bssid(ifs, bssid) == 0) | |
518 | return ifs->assoc_freq; | |
519 | } | |
520 | ||
521 | return 0; | |
522 | } | |
523 | ||
5cc70322 | 524 | |
5f738a21 LC |
525 | static void wpa_supplicant_scan(void *eloop_ctx, void *timeout_ctx) |
526 | { | |
527 | struct wpa_supplicant *wpa_s = eloop_ctx; | |
528 | struct wpa_ssid *ssid; | |
4115303b JM |
529 | enum scan_req_type scan_req = NORMAL_SCAN_REQ; |
530 | int ret; | |
b9b12d02 | 531 | struct wpabuf *extra_ie = NULL; |
e76baaac | 532 | struct wpa_driver_scan_params params; |
7c865c68 | 533 | struct wpa_driver_scan_params *scan_params; |
e76baaac | 534 | size_t max_ssids; |
207ef3fb | 535 | enum wpa_states prev_state; |
6fc6879b | 536 | |
8401a6b0 | 537 | if (wpa_s->wpa_state == WPA_INTERFACE_DISABLED) { |
f049052b | 538 | wpa_dbg(wpa_s, MSG_DEBUG, "Skip scan - interface disabled"); |
b1cd021e | 539 | wpas_p2p_continue_after_scan(wpa_s); |
8401a6b0 JM |
540 | return; |
541 | } | |
542 | ||
4115303b | 543 | if (wpa_s->disconnected && wpa_s->scan_req == NORMAL_SCAN_REQ) { |
ac06fb12 | 544 | wpa_dbg(wpa_s, MSG_DEBUG, "Disconnected - do not scan"); |
3180d7a2 | 545 | wpa_supplicant_set_state(wpa_s, WPA_DISCONNECTED); |
b1cd021e | 546 | wpas_p2p_continue_after_scan(wpa_s); |
6fc6879b | 547 | return; |
3180d7a2 | 548 | } |
6fc6879b | 549 | |
349493bd | 550 | if (!wpa_supplicant_enabled_networks(wpa_s) && |
4115303b | 551 | wpa_s->scan_req == NORMAL_SCAN_REQ) { |
f049052b | 552 | wpa_dbg(wpa_s, MSG_DEBUG, "No enabled networks - do not scan"); |
6fc6879b | 553 | wpa_supplicant_set_state(wpa_s, WPA_INACTIVE); |
b1cd021e | 554 | wpas_p2p_continue_after_scan(wpa_s); |
6fc6879b JM |
555 | return; |
556 | } | |
6fc6879b | 557 | |
c2a04078 JM |
558 | if (wpa_s->conf->ap_scan != 0 && |
559 | (wpa_s->drv_flags & WPA_DRIVER_FLAGS_WIRED)) { | |
f049052b BG |
560 | wpa_dbg(wpa_s, MSG_DEBUG, "Using wired authentication - " |
561 | "overriding ap_scan configuration"); | |
6fc6879b | 562 | wpa_s->conf->ap_scan = 0; |
8bac466b | 563 | wpas_notify_ap_scan_changed(wpa_s); |
6fc6879b JM |
564 | } |
565 | ||
566 | if (wpa_s->conf->ap_scan == 0) { | |
567 | wpa_supplicant_gen_assoc_event(wpa_s); | |
568 | return; | |
569 | } | |
570 | ||
303f60d3 | 571 | #ifdef CONFIG_P2P |
36b9883d | 572 | if (wpas_p2p_in_progress(wpa_s) || wpas_wpa_is_in_progress(wpa_s)) { |
99fcd404 JM |
573 | if (wpa_s->sta_scan_pending && |
574 | wpas_p2p_in_progress(wpa_s) == 2 && | |
e665ca9a | 575 | wpa_s->global->p2p_cb_on_scan_complete) { |
99fcd404 JM |
576 | wpa_dbg(wpa_s, MSG_DEBUG, "Process pending station " |
577 | "mode scan during P2P search"); | |
578 | } else { | |
303f60d3 JM |
579 | wpa_dbg(wpa_s, MSG_DEBUG, "Delay station mode scan " |
580 | "while P2P operation is in progress"); | |
99fcd404 | 581 | wpa_s->sta_scan_pending = 1; |
303f60d3 | 582 | wpa_supplicant_req_scan(wpa_s, 5, 0); |
99fcd404 | 583 | return; |
303f60d3 | 584 | } |
303f60d3 JM |
585 | } |
586 | #endif /* CONFIG_P2P */ | |
587 | ||
17fbb751 | 588 | if (wpa_s->conf->ap_scan == 2) |
e76baaac JM |
589 | max_ssids = 1; |
590 | else { | |
591 | max_ssids = wpa_s->max_scan_ssids; | |
592 | if (max_ssids > WPAS_MAX_SCAN_SSIDS) | |
593 | max_ssids = WPAS_MAX_SCAN_SSIDS; | |
594 | } | |
595 | ||
e76baaac | 596 | scan_req = wpa_s->scan_req; |
4115303b | 597 | wpa_s->scan_req = NORMAL_SCAN_REQ; |
e76baaac JM |
598 | |
599 | os_memset(¶ms, 0, sizeof(params)); | |
600 | ||
207ef3fb | 601 | prev_state = wpa_s->wpa_state; |
6fc6879b JM |
602 | if (wpa_s->wpa_state == WPA_DISCONNECTED || |
603 | wpa_s->wpa_state == WPA_INACTIVE) | |
604 | wpa_supplicant_set_state(wpa_s, WPA_SCANNING); | |
605 | ||
7c865c68 TB |
606 | /* |
607 | * If autoscan has set its own scanning parameters | |
608 | */ | |
609 | if (wpa_s->autoscan_params != NULL) { | |
610 | scan_params = wpa_s->autoscan_params; | |
611 | goto scan; | |
612 | } | |
613 | ||
4115303b | 614 | if (scan_req != MANUAL_SCAN_REQ && wpa_s->connect_without_scan) { |
7dcdcfd6 JM |
615 | for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) { |
616 | if (ssid == wpa_s->connect_without_scan) | |
617 | break; | |
618 | } | |
619 | wpa_s->connect_without_scan = NULL; | |
620 | if (ssid) { | |
621 | wpa_printf(MSG_DEBUG, "Start a pre-selected network " | |
622 | "without scan step"); | |
623 | wpa_supplicant_associate(wpa_s, NULL, ssid); | |
624 | return; | |
625 | } | |
626 | } | |
627 | ||
a21c05db | 628 | #ifdef CONFIG_P2P |
85ea132a JM |
629 | if ((wpa_s->p2p_in_provisioning || wpa_s->show_group_started) && |
630 | wpa_s->go_params) { | |
a21c05db | 631 | wpa_printf(MSG_DEBUG, "P2P: Use specific SSID for scan during " |
85ea132a | 632 | "P2P group formation"); |
a21c05db JM |
633 | params.ssids[0].ssid = wpa_s->go_params->ssid; |
634 | params.ssids[0].ssid_len = wpa_s->go_params->ssid_len; | |
635 | params.num_ssids = 1; | |
636 | goto ssid_list_set; | |
637 | } | |
638 | #endif /* CONFIG_P2P */ | |
639 | ||
e76baaac | 640 | /* Find the starting point from which to continue scanning */ |
6fc6879b | 641 | ssid = wpa_s->conf->ssid; |
ba2a573c | 642 | if (wpa_s->prev_scan_ssid != WILDCARD_SSID_SCAN) { |
6fc6879b JM |
643 | while (ssid) { |
644 | if (ssid == wpa_s->prev_scan_ssid) { | |
645 | ssid = ssid->next; | |
646 | break; | |
647 | } | |
648 | ssid = ssid->next; | |
649 | } | |
650 | } | |
6fc6879b | 651 | |
4115303b | 652 | if (scan_req != MANUAL_SCAN_REQ && wpa_s->conf->ap_scan == 2) { |
7dcdcfd6 | 653 | wpa_s->connect_without_scan = NULL; |
b3aa456b | 654 | wpa_s->prev_scan_wildcard = 0; |
e76baaac JM |
655 | wpa_supplicant_assoc_try(wpa_s, ssid); |
656 | return; | |
657 | } else if (wpa_s->conf->ap_scan == 2) { | |
6fc6879b | 658 | /* |
ba2a573c JM |
659 | * User-initiated scan request in ap_scan == 2; scan with |
660 | * wildcard SSID. | |
6fc6879b | 661 | */ |
e76baaac JM |
662 | ssid = NULL; |
663 | } else { | |
5be45e2e | 664 | struct wpa_ssid *start = ssid, *tssid; |
d3a98225 | 665 | int freqs_set = 0; |
e76baaac JM |
666 | if (ssid == NULL && max_ssids > 1) |
667 | ssid = wpa_s->conf->ssid; | |
668 | while (ssid) { | |
349493bd JM |
669 | if (!wpas_network_disabled(wpa_s, ssid) && |
670 | ssid->scan_ssid) { | |
e76baaac JM |
671 | wpa_hexdump_ascii(MSG_DEBUG, "Scan SSID", |
672 | ssid->ssid, ssid->ssid_len); | |
673 | params.ssids[params.num_ssids].ssid = | |
674 | ssid->ssid; | |
675 | params.ssids[params.num_ssids].ssid_len = | |
676 | ssid->ssid_len; | |
677 | params.num_ssids++; | |
678 | if (params.num_ssids + 1 >= max_ssids) | |
679 | break; | |
680 | } | |
681 | ssid = ssid->next; | |
682 | if (ssid == start) | |
683 | break; | |
684 | if (ssid == NULL && max_ssids > 1 && | |
685 | start != wpa_s->conf->ssid) | |
686 | ssid = wpa_s->conf->ssid; | |
6fc6879b | 687 | } |
d3a98225 | 688 | |
5be45e2e | 689 | for (tssid = wpa_s->conf->ssid; tssid; tssid = tssid->next) { |
349493bd | 690 | if (wpas_network_disabled(wpa_s, tssid)) |
d3a98225 | 691 | continue; |
5be45e2e | 692 | if ((params.freqs || !freqs_set) && tssid->scan_freq) { |
d3a98225 | 693 | int_array_concat(¶ms.freqs, |
5be45e2e | 694 | tssid->scan_freq); |
d3a98225 JM |
695 | } else { |
696 | os_free(params.freqs); | |
697 | params.freqs = NULL; | |
698 | } | |
699 | freqs_set = 1; | |
700 | } | |
701 | int_array_sort_unique(params.freqs); | |
6fc6879b JM |
702 | } |
703 | ||
b3aa456b ES |
704 | if (ssid && max_ssids == 1) { |
705 | /* | |
706 | * If the driver is limited to 1 SSID at a time interleave | |
707 | * wildcard SSID scans with specific SSID scans to avoid | |
708 | * waiting a long time for a wildcard scan. | |
709 | */ | |
710 | if (!wpa_s->prev_scan_wildcard) { | |
711 | params.ssids[0].ssid = NULL; | |
712 | params.ssids[0].ssid_len = 0; | |
713 | wpa_s->prev_scan_wildcard = 1; | |
714 | wpa_dbg(wpa_s, MSG_DEBUG, "Starting AP scan for " | |
715 | "wildcard SSID (Interleave with specific)"); | |
716 | } else { | |
717 | wpa_s->prev_scan_ssid = ssid; | |
718 | wpa_s->prev_scan_wildcard = 0; | |
719 | wpa_dbg(wpa_s, MSG_DEBUG, | |
720 | "Starting AP scan for specific SSID: %s", | |
721 | wpa_ssid_txt(ssid->ssid, ssid->ssid_len)); | |
e76baaac | 722 | } |
b3aa456b ES |
723 | } else if (ssid) { |
724 | /* max_ssids > 1 */ | |
725 | ||
726 | wpa_s->prev_scan_ssid = ssid; | |
727 | wpa_dbg(wpa_s, MSG_DEBUG, "Include wildcard SSID in " | |
728 | "the scan request"); | |
729 | params.num_ssids++; | |
e76baaac | 730 | } else { |
ba2a573c | 731 | wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN; |
e76baaac | 732 | params.num_ssids++; |
f049052b BG |
733 | wpa_dbg(wpa_s, MSG_DEBUG, "Starting AP scan for wildcard " |
734 | "SSID"); | |
6fc6879b | 735 | } |
a21c05db JM |
736 | #ifdef CONFIG_P2P |
737 | ssid_list_set: | |
738 | #endif /* CONFIG_P2P */ | |
6fc6879b | 739 | |
5f738a21 | 740 | wpa_supplicant_optimize_freqs(wpa_s, ¶ms); |
a13e07ec | 741 | extra_ie = wpa_supplicant_extra_ies(wpa_s); |
0e65037c | 742 | |
f47d639d | 743 | if (params.freqs == NULL && wpa_s->next_scan_freqs) { |
f049052b BG |
744 | wpa_dbg(wpa_s, MSG_DEBUG, "Optimize scan based on previously " |
745 | "generated frequency list"); | |
f47d639d JM |
746 | params.freqs = wpa_s->next_scan_freqs; |
747 | } else | |
748 | os_free(wpa_s->next_scan_freqs); | |
749 | wpa_s->next_scan_freqs = NULL; | |
750 | ||
f5ffc348 BG |
751 | /* See if user specified frequencies. If so, scan only those. */ |
752 | if (wpa_s->conf->freq_list && !params.freqs) { | |
753 | wpa_dbg(wpa_s, MSG_DEBUG, | |
754 | "Optimize scan based on conf->freq_list"); | |
755 | int_array_concat(¶ms.freqs, wpa_s->conf->freq_list); | |
756 | } | |
757 | ||
6124e858 BG |
758 | /* Use current associated channel? */ |
759 | if (wpa_s->conf->scan_cur_freq && !params.freqs) { | |
760 | int freq = shared_vif_oper_freq(wpa_s); | |
761 | if (freq > 0) { | |
762 | wpa_dbg(wpa_s, MSG_DEBUG, "Scan only the current " | |
763 | "operating channel (%d MHz) since " | |
764 | "scan_cur_freq is enabled", freq); | |
765 | params.freqs = os_zalloc(sizeof(int) * 2); | |
766 | if (params.freqs) | |
767 | params.freqs[0] = freq; | |
768 | } | |
769 | } | |
770 | ||
3812464c JM |
771 | params.filter_ssids = wpa_supplicant_build_filter_ssids( |
772 | wpa_s->conf, ¶ms.num_filter_ssids); | |
46ee0427 JM |
773 | if (extra_ie) { |
774 | params.extra_ies = wpabuf_head(extra_ie); | |
775 | params.extra_ies_len = wpabuf_len(extra_ie); | |
776 | } | |
3812464c | 777 | |
d1dd48e3 | 778 | #ifdef CONFIG_P2P |
85ea132a JM |
779 | if (wpa_s->p2p_in_provisioning || |
780 | (wpa_s->show_group_started && wpa_s->go_params)) { | |
d1dd48e3 JM |
781 | /* |
782 | * The interface may not yet be in P2P mode, so we have to | |
783 | * explicitly request P2P probe to disable CCK rates. | |
784 | */ | |
785 | params.p2p_probe = 1; | |
786 | } | |
787 | #endif /* CONFIG_P2P */ | |
788 | ||
7c865c68 TB |
789 | scan_params = ¶ms; |
790 | ||
791 | scan: | |
5cc70322 JM |
792 | #ifdef CONFIG_P2P |
793 | /* | |
794 | * If the driver does not support multi-channel concurrency and a | |
795 | * virtual interface that shares the same radio with the wpa_s interface | |
796 | * is operating there may not be need to scan other channels apart from | |
797 | * the current operating channel on the other virtual interface. Filter | |
798 | * out other channels in case we are trying to find a connection for a | |
799 | * station interface when we are not configured to prefer station | |
800 | * connection and a concurrent operation is already in process. | |
801 | */ | |
4115303b | 802 | if (wpa_s->scan_for_connection && scan_req == NORMAL_SCAN_REQ && |
5cc70322 JM |
803 | !scan_params->freqs && !params.freqs && |
804 | wpas_is_p2p_prioritized(wpa_s) && | |
805 | !(wpa_s->drv_flags & WPA_DRIVER_FLAGS_MULTI_CHANNEL_CONCURRENT) && | |
806 | wpa_s->p2p_group_interface == NOT_P2P_GROUP_INTERFACE && | |
807 | non_p2p_network_enabled(wpa_s)) { | |
808 | int freq = shared_vif_oper_freq(wpa_s); | |
809 | if (freq > 0) { | |
810 | wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only the current " | |
811 | "operating channel (%d MHz) since driver does " | |
812 | "not support multi-channel concurrency", freq); | |
813 | params.freqs = os_zalloc(sizeof(int) * 2); | |
814 | if (params.freqs) | |
815 | params.freqs[0] = freq; | |
816 | scan_params->freqs = params.freqs; | |
817 | } | |
818 | } | |
819 | #endif /* CONFIG_P2P */ | |
820 | ||
7c865c68 | 821 | ret = wpa_supplicant_trigger_scan(wpa_s, scan_params); |
6fc6879b | 822 | |
46ee0427 | 823 | wpabuf_free(extra_ie); |
d3a98225 | 824 | os_free(params.freqs); |
3812464c | 825 | os_free(params.filter_ssids); |
ad08c363 | 826 | |
6fc6879b | 827 | if (ret) { |
f049052b | 828 | wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate AP scan"); |
207ef3fb JM |
829 | if (prev_state != wpa_s->wpa_state) |
830 | wpa_supplicant_set_state(wpa_s, prev_state); | |
23270cd8 JM |
831 | /* Restore scan_req since we will try to scan again */ |
832 | wpa_s->scan_req = scan_req; | |
1c4c9c50 | 833 | wpa_supplicant_req_scan(wpa_s, 1, 0); |
5cc70322 JM |
834 | } else { |
835 | wpa_s->scan_for_connection = 0; | |
d902a9c1 | 836 | } |
6fc6879b JM |
837 | } |
838 | ||
839 | ||
9e737f08 PF |
840 | void wpa_supplicant_update_scan_int(struct wpa_supplicant *wpa_s, int sec) |
841 | { | |
842 | struct os_time remaining, new_int; | |
843 | int cancelled; | |
844 | ||
845 | cancelled = eloop_cancel_timeout_one(wpa_supplicant_scan, wpa_s, NULL, | |
846 | &remaining); | |
847 | ||
848 | new_int.sec = sec; | |
849 | new_int.usec = 0; | |
850 | if (cancelled && os_time_before(&remaining, &new_int)) { | |
851 | new_int.sec = remaining.sec; | |
852 | new_int.usec = remaining.usec; | |
853 | } | |
854 | ||
855 | eloop_register_timeout(new_int.sec, new_int.usec, wpa_supplicant_scan, | |
856 | wpa_s, NULL); | |
857 | wpa_s->scan_interval = sec; | |
858 | } | |
859 | ||
860 | ||
6fc6879b JM |
861 | /** |
862 | * wpa_supplicant_req_scan - Schedule a scan for neighboring access points | |
863 | * @wpa_s: Pointer to wpa_supplicant data | |
864 | * @sec: Number of seconds after which to scan | |
865 | * @usec: Number of microseconds after which to scan | |
866 | * | |
867 | * This function is used to schedule a scan for neighboring access points after | |
868 | * the specified time. | |
869 | */ | |
870 | void wpa_supplicant_req_scan(struct wpa_supplicant *wpa_s, int sec, int usec) | |
871 | { | |
7e148849 DW |
872 | /* If there's at least one network that should be specifically scanned |
873 | * then don't cancel the scan and reschedule. Some drivers do | |
874 | * background scanning which generates frequent scan results, and that | |
875 | * causes the specific SSID scan to get continually pushed back and | |
876 | * never happen, which causes hidden APs to never get probe-scanned. | |
877 | */ | |
878 | if (eloop_is_timeout_registered(wpa_supplicant_scan, wpa_s, NULL) && | |
879 | wpa_s->conf->ap_scan == 1) { | |
880 | struct wpa_ssid *ssid = wpa_s->conf->ssid; | |
881 | ||
882 | while (ssid) { | |
349493bd JM |
883 | if (!wpas_network_disabled(wpa_s, ssid) && |
884 | ssid->scan_ssid) | |
7e148849 DW |
885 | break; |
886 | ssid = ssid->next; | |
887 | } | |
888 | if (ssid) { | |
f049052b | 889 | wpa_dbg(wpa_s, MSG_DEBUG, "Not rescheduling scan to " |
7e148849 DW |
890 | "ensure that specific SSID scans occur"); |
891 | return; | |
892 | } | |
893 | } | |
894 | ||
f049052b | 895 | wpa_dbg(wpa_s, MSG_DEBUG, "Setting scan request: %d sec %d usec", |
6fc6879b JM |
896 | sec, usec); |
897 | eloop_cancel_timeout(wpa_supplicant_scan, wpa_s, NULL); | |
898 | eloop_register_timeout(sec, usec, wpa_supplicant_scan, wpa_s, NULL); | |
899 | } | |
900 | ||
901 | ||
6a90053c LC |
902 | /** |
903 | * wpa_supplicant_delayed_sched_scan - Request a delayed scheduled scan | |
904 | * @wpa_s: Pointer to wpa_supplicant data | |
905 | * @sec: Number of seconds after which to scan | |
906 | * @usec: Number of microseconds after which to scan | |
2c09af30 | 907 | * Returns: 0 on success or -1 otherwise |
6a90053c LC |
908 | * |
909 | * This function is used to schedule periodic scans for neighboring | |
910 | * access points after the specified time. | |
911 | */ | |
912 | int wpa_supplicant_delayed_sched_scan(struct wpa_supplicant *wpa_s, | |
913 | int sec, int usec) | |
914 | { | |
915 | if (!wpa_s->sched_scan_supported) | |
916 | return -1; | |
917 | ||
918 | eloop_register_timeout(sec, usec, | |
919 | wpa_supplicant_delayed_sched_scan_timeout, | |
920 | wpa_s, NULL); | |
921 | ||
922 | return 0; | |
923 | } | |
924 | ||
925 | ||
cbdf3507 LC |
926 | /** |
927 | * wpa_supplicant_req_sched_scan - Start a periodic scheduled scan | |
928 | * @wpa_s: Pointer to wpa_supplicant data | |
2c09af30 | 929 | * Returns: 0 is sched_scan was started or -1 otherwise |
cbdf3507 LC |
930 | * |
931 | * This function is used to schedule periodic scans for neighboring | |
932 | * access points repeating the scan continuously. | |
933 | */ | |
934 | int wpa_supplicant_req_sched_scan(struct wpa_supplicant *wpa_s) | |
935 | { | |
936 | struct wpa_driver_scan_params params; | |
7c865c68 | 937 | struct wpa_driver_scan_params *scan_params; |
cbdf3507 | 938 | enum wpa_states prev_state; |
7c865c68 | 939 | struct wpa_ssid *ssid = NULL; |
a13e07ec | 940 | struct wpabuf *extra_ie = NULL; |
cbdf3507 | 941 | int ret; |
cbdf3507 | 942 | unsigned int max_sched_scan_ssids; |
76a5249e | 943 | int wildcard = 0; |
0b7a25c0 | 944 | int need_ssids; |
cbdf3507 LC |
945 | |
946 | if (!wpa_s->sched_scan_supported) | |
947 | return -1; | |
948 | ||
949 | if (wpa_s->max_sched_scan_ssids > WPAS_MAX_SCAN_SSIDS) | |
950 | max_sched_scan_ssids = WPAS_MAX_SCAN_SSIDS; | |
951 | else | |
952 | max_sched_scan_ssids = wpa_s->max_sched_scan_ssids; | |
54ddd743 | 953 | if (max_sched_scan_ssids < 1 || wpa_s->conf->disable_scan_offload) |
76a5249e | 954 | return -1; |
cbdf3507 | 955 | |
1966e3d1 ES |
956 | if (wpa_s->sched_scanning) { |
957 | wpa_dbg(wpa_s, MSG_DEBUG, "Already sched scanning"); | |
cbdf3507 | 958 | return 0; |
1966e3d1 | 959 | } |
cbdf3507 | 960 | |
0b7a25c0 JM |
961 | need_ssids = 0; |
962 | for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) { | |
349493bd | 963 | if (!wpas_network_disabled(wpa_s, ssid) && !ssid->scan_ssid) { |
0b7a25c0 JM |
964 | /* Use wildcard SSID to find this network */ |
965 | wildcard = 1; | |
349493bd JM |
966 | } else if (!wpas_network_disabled(wpa_s, ssid) && |
967 | ssid->ssid_len) | |
0b7a25c0 | 968 | need_ssids++; |
aa283ddd JM |
969 | |
970 | #ifdef CONFIG_WPS | |
349493bd | 971 | if (!wpas_network_disabled(wpa_s, ssid) && |
fea7c3a0 | 972 | ssid->key_mgmt == WPA_KEY_MGMT_WPS) { |
aa283ddd JM |
973 | /* |
974 | * Normal scan is more reliable and faster for WPS | |
975 | * operations and since these are for short periods of | |
976 | * time, the benefit of trying to use sched_scan would | |
977 | * be limited. | |
978 | */ | |
979 | wpa_dbg(wpa_s, MSG_DEBUG, "Use normal scan instead of " | |
980 | "sched_scan for WPS"); | |
981 | return -1; | |
982 | } | |
983 | #endif /* CONFIG_WPS */ | |
0b7a25c0 JM |
984 | } |
985 | if (wildcard) | |
986 | need_ssids++; | |
987 | ||
988 | if (wpa_s->normal_scans < 3 && | |
989 | (need_ssids <= wpa_s->max_scan_ssids || | |
990 | wpa_s->max_scan_ssids >= (int) max_sched_scan_ssids)) { | |
991 | /* | |
992 | * When normal scan can speed up operations, use that for the | |
993 | * first operations before starting the sched_scan to allow | |
994 | * user space sleep more. We do this only if the normal scan | |
995 | * has functionality that is suitable for this or if the | |
996 | * sched_scan does not have better support for multiple SSIDs. | |
997 | */ | |
998 | wpa_dbg(wpa_s, MSG_DEBUG, "Use normal scan instead of " | |
999 | "sched_scan for initial scans (normal_scans=%d)", | |
1000 | wpa_s->normal_scans); | |
1001 | return -1; | |
1002 | } | |
1003 | ||
cbdf3507 LC |
1004 | os_memset(¶ms, 0, sizeof(params)); |
1005 | ||
b59e6f26 LC |
1006 | /* If we can't allocate space for the filters, we just don't filter */ |
1007 | params.filter_ssids = os_zalloc(wpa_s->max_match_sets * | |
1008 | sizeof(struct wpa_driver_scan_filter)); | |
1009 | ||
cbdf3507 LC |
1010 | prev_state = wpa_s->wpa_state; |
1011 | if (wpa_s->wpa_state == WPA_DISCONNECTED || | |
1012 | wpa_s->wpa_state == WPA_INACTIVE) | |
1013 | wpa_supplicant_set_state(wpa_s, WPA_SCANNING); | |
1014 | ||
7c865c68 TB |
1015 | if (wpa_s->autoscan_params != NULL) { |
1016 | scan_params = wpa_s->autoscan_params; | |
1017 | goto scan; | |
1018 | } | |
1019 | ||
cbdf3507 LC |
1020 | /* Find the starting point from which to continue scanning */ |
1021 | ssid = wpa_s->conf->ssid; | |
1022 | if (wpa_s->prev_sched_ssid) { | |
1023 | while (ssid) { | |
1024 | if (ssid == wpa_s->prev_sched_ssid) { | |
1025 | ssid = ssid->next; | |
1026 | break; | |
1027 | } | |
1028 | ssid = ssid->next; | |
1029 | } | |
1030 | } | |
1031 | ||
1032 | if (!ssid || !wpa_s->prev_sched_ssid) { | |
1033 | wpa_dbg(wpa_s, MSG_DEBUG, "Beginning of SSID list"); | |
4aa81868 SF |
1034 | if (wpa_s->conf->sched_scan_interval) |
1035 | wpa_s->sched_scan_interval = | |
1036 | wpa_s->conf->sched_scan_interval; | |
7c865c68 TB |
1037 | if (wpa_s->sched_scan_interval == 0) |
1038 | wpa_s->sched_scan_interval = 10; | |
cbdf3507 LC |
1039 | wpa_s->sched_scan_timeout = max_sched_scan_ssids * 2; |
1040 | wpa_s->first_sched_scan = 1; | |
1041 | ssid = wpa_s->conf->ssid; | |
1042 | wpa_s->prev_sched_ssid = ssid; | |
1043 | } | |
1044 | ||
76a5249e JM |
1045 | if (wildcard) { |
1046 | wpa_dbg(wpa_s, MSG_DEBUG, "Add wildcard SSID to sched_scan"); | |
1047 | params.num_ssids++; | |
1048 | } | |
1049 | ||
cbdf3507 | 1050 | while (ssid) { |
349493bd | 1051 | if (wpas_network_disabled(wpa_s, ssid)) |
5edddf41 | 1052 | goto next; |
cbdf3507 | 1053 | |
fcd16847 JM |
1054 | if (params.num_filter_ssids < wpa_s->max_match_sets && |
1055 | params.filter_ssids && ssid->ssid && ssid->ssid_len) { | |
1966e3d1 ES |
1056 | wpa_dbg(wpa_s, MSG_DEBUG, "add to filter ssid: %s", |
1057 | wpa_ssid_txt(ssid->ssid, ssid->ssid_len)); | |
b59e6f26 LC |
1058 | os_memcpy(params.filter_ssids[params.num_filter_ssids].ssid, |
1059 | ssid->ssid, ssid->ssid_len); | |
1060 | params.filter_ssids[params.num_filter_ssids].ssid_len = | |
1061 | ssid->ssid_len; | |
1062 | params.num_filter_ssids++; | |
86b47aaf JM |
1063 | } else if (params.filter_ssids && ssid->ssid && ssid->ssid_len) |
1064 | { | |
1065 | wpa_dbg(wpa_s, MSG_DEBUG, "Not enough room for SSID " | |
1066 | "filter for sched_scan - drop filter"); | |
1067 | os_free(params.filter_ssids); | |
1068 | params.filter_ssids = NULL; | |
1069 | params.num_filter_ssids = 0; | |
b59e6f26 LC |
1070 | } |
1071 | ||
3f56f3a4 | 1072 | if (ssid->scan_ssid && ssid->ssid && ssid->ssid_len) { |
76a5249e JM |
1073 | if (params.num_ssids == max_sched_scan_ssids) |
1074 | break; /* only room for broadcast SSID */ | |
3f56f3a4 JM |
1075 | wpa_dbg(wpa_s, MSG_DEBUG, |
1076 | "add to active scan ssid: %s", | |
1966e3d1 | 1077 | wpa_ssid_txt(ssid->ssid, ssid->ssid_len)); |
cbdf3507 LC |
1078 | params.ssids[params.num_ssids].ssid = |
1079 | ssid->ssid; | |
1080 | params.ssids[params.num_ssids].ssid_len = | |
1081 | ssid->ssid_len; | |
1082 | params.num_ssids++; | |
b59e6f26 | 1083 | if (params.num_ssids >= max_sched_scan_ssids) { |
cbdf3507 | 1084 | wpa_s->prev_sched_ssid = ssid; |
b55aca46 JM |
1085 | do { |
1086 | ssid = ssid->next; | |
1087 | } while (ssid && | |
349493bd | 1088 | (wpas_network_disabled(wpa_s, ssid) || |
fea7c3a0 | 1089 | !ssid->scan_ssid)); |
cbdf3507 LC |
1090 | break; |
1091 | } | |
1092 | } | |
b59e6f26 | 1093 | |
5edddf41 | 1094 | next: |
cbdf3507 LC |
1095 | wpa_s->prev_sched_ssid = ssid; |
1096 | ssid = ssid->next; | |
1097 | } | |
1098 | ||
7c6a266c JM |
1099 | if (params.num_filter_ssids == 0) { |
1100 | os_free(params.filter_ssids); | |
1101 | params.filter_ssids = NULL; | |
1102 | } | |
1103 | ||
a13e07ec ES |
1104 | extra_ie = wpa_supplicant_extra_ies(wpa_s); |
1105 | if (extra_ie) { | |
1106 | params.extra_ies = wpabuf_head(extra_ie); | |
1107 | params.extra_ies_len = wpabuf_len(extra_ie); | |
1108 | } | |
cbdf3507 | 1109 | |
7c865c68 TB |
1110 | scan_params = ¶ms; |
1111 | ||
1112 | scan: | |
a8cb5a88 | 1113 | if (ssid || !wpa_s->first_sched_scan) { |
a8cb5a88 JM |
1114 | wpa_dbg(wpa_s, MSG_DEBUG, |
1115 | "Starting sched scan: interval %d timeout %d", | |
1116 | wpa_s->sched_scan_interval, wpa_s->sched_scan_timeout); | |
7d21a223 JM |
1117 | } else { |
1118 | wpa_dbg(wpa_s, MSG_DEBUG, | |
1119 | "Starting sched scan: interval %d (no timeout)", | |
1120 | wpa_s->sched_scan_interval); | |
a8cb5a88 | 1121 | } |
cbdf3507 | 1122 | |
7c865c68 | 1123 | ret = wpa_supplicant_start_sched_scan(wpa_s, scan_params, |
cbdf3507 | 1124 | wpa_s->sched_scan_interval); |
a13e07ec | 1125 | wpabuf_free(extra_ie); |
b59e6f26 | 1126 | os_free(params.filter_ssids); |
cbdf3507 LC |
1127 | if (ret) { |
1128 | wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate sched scan"); | |
1129 | if (prev_state != wpa_s->wpa_state) | |
1130 | wpa_supplicant_set_state(wpa_s, prev_state); | |
1131 | return ret; | |
1132 | } | |
1133 | ||
1134 | /* If we have more SSIDs to scan, add a timeout so we scan them too */ | |
1135 | if (ssid || !wpa_s->first_sched_scan) { | |
1136 | wpa_s->sched_scan_timed_out = 0; | |
1137 | eloop_register_timeout(wpa_s->sched_scan_timeout, 0, | |
1138 | wpa_supplicant_sched_scan_timeout, | |
1139 | wpa_s, NULL); | |
1140 | wpa_s->first_sched_scan = 0; | |
1141 | wpa_s->sched_scan_timeout /= 2; | |
1142 | wpa_s->sched_scan_interval *= 2; | |
a09fc1cc DS |
1143 | if (wpa_s->sched_scan_timeout < wpa_s->sched_scan_interval) { |
1144 | wpa_s->sched_scan_interval = 10; | |
1145 | wpa_s->sched_scan_timeout = max_sched_scan_ssids * 2; | |
1146 | } | |
cbdf3507 LC |
1147 | } |
1148 | ||
7ed52f67 DS |
1149 | /* If there is no more ssids, start next time from the beginning */ |
1150 | if (!ssid) | |
1151 | wpa_s->prev_sched_ssid = NULL; | |
1152 | ||
cbdf3507 LC |
1153 | return 0; |
1154 | } | |
1155 | ||
1156 | ||
6fc6879b JM |
1157 | /** |
1158 | * wpa_supplicant_cancel_scan - Cancel a scheduled scan request | |
1159 | * @wpa_s: Pointer to wpa_supplicant data | |
1160 | * | |
1161 | * This function is used to cancel a scan request scheduled with | |
1162 | * wpa_supplicant_req_scan(). | |
1163 | */ | |
1164 | void wpa_supplicant_cancel_scan(struct wpa_supplicant *wpa_s) | |
1165 | { | |
f049052b | 1166 | wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling scan request"); |
6fc6879b | 1167 | eloop_cancel_timeout(wpa_supplicant_scan, wpa_s, NULL); |
b1cd021e | 1168 | wpas_p2p_continue_after_scan(wpa_s); |
6fc6879b | 1169 | } |
cb8564b1 DW |
1170 | |
1171 | ||
cbdf3507 LC |
1172 | /** |
1173 | * wpa_supplicant_cancel_sched_scan - Stop running scheduled scans | |
1174 | * @wpa_s: Pointer to wpa_supplicant data | |
1175 | * | |
1176 | * This function is used to stop a periodic scheduled scan. | |
1177 | */ | |
1178 | void wpa_supplicant_cancel_sched_scan(struct wpa_supplicant *wpa_s) | |
1179 | { | |
1180 | if (!wpa_s->sched_scanning) | |
1181 | return; | |
1182 | ||
1183 | wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling sched scan"); | |
1184 | eloop_cancel_timeout(wpa_supplicant_sched_scan_timeout, wpa_s, NULL); | |
1185 | wpa_supplicant_stop_sched_scan(wpa_s); | |
1186 | } | |
1187 | ||
1188 | ||
2c09af30 JM |
1189 | /** |
1190 | * wpa_supplicant_notify_scanning - Indicate possible scan state change | |
1191 | * @wpa_s: Pointer to wpa_supplicant data | |
1192 | * @scanning: Whether scanning is currently in progress | |
1193 | * | |
1194 | * This function is to generate scanning notifycations. It is called whenever | |
1195 | * there may have been a change in scanning (scan started, completed, stopped). | |
1196 | * wpas_notify_scanning() is called whenever the scanning state changed from the | |
1197 | * previously notified state. | |
1198 | */ | |
cb8564b1 DW |
1199 | void wpa_supplicant_notify_scanning(struct wpa_supplicant *wpa_s, |
1200 | int scanning) | |
1201 | { | |
1202 | if (wpa_s->scanning != scanning) { | |
1203 | wpa_s->scanning = scanning; | |
8bac466b | 1204 | wpas_notify_scanning(wpa_s); |
cb8564b1 DW |
1205 | } |
1206 | } | |
1207 | ||
9ba9fa07 JM |
1208 | |
1209 | static int wpa_scan_get_max_rate(const struct wpa_scan_res *res) | |
1210 | { | |
1211 | int rate = 0; | |
1212 | const u8 *ie; | |
1213 | int i; | |
1214 | ||
1215 | ie = wpa_scan_get_ie(res, WLAN_EID_SUPP_RATES); | |
1216 | for (i = 0; ie && i < ie[1]; i++) { | |
1217 | if ((ie[i + 2] & 0x7f) > rate) | |
1218 | rate = ie[i + 2] & 0x7f; | |
1219 | } | |
1220 | ||
1221 | ie = wpa_scan_get_ie(res, WLAN_EID_EXT_SUPP_RATES); | |
1222 | for (i = 0; ie && i < ie[1]; i++) { | |
1223 | if ((ie[i + 2] & 0x7f) > rate) | |
1224 | rate = ie[i + 2] & 0x7f; | |
1225 | } | |
1226 | ||
1227 | return rate; | |
1228 | } | |
1229 | ||
1230 | ||
2c09af30 JM |
1231 | /** |
1232 | * wpa_scan_get_ie - Fetch a specified information element from a scan result | |
1233 | * @res: Scan result entry | |
1234 | * @ie: Information element identitifier (WLAN_EID_*) | |
1235 | * Returns: Pointer to the information element (id field) or %NULL if not found | |
1236 | * | |
1237 | * This function returns the first matching information element in the scan | |
1238 | * result. | |
1239 | */ | |
d1f9c410 JM |
1240 | const u8 * wpa_scan_get_ie(const struct wpa_scan_res *res, u8 ie) |
1241 | { | |
1242 | const u8 *end, *pos; | |
1243 | ||
1244 | pos = (const u8 *) (res + 1); | |
1245 | end = pos + res->ie_len; | |
1246 | ||
1247 | while (pos + 1 < end) { | |
1248 | if (pos + 2 + pos[1] > end) | |
1249 | break; | |
1250 | if (pos[0] == ie) | |
1251 | return pos; | |
1252 | pos += 2 + pos[1]; | |
1253 | } | |
1254 | ||
1255 | return NULL; | |
1256 | } | |
1257 | ||
1258 | ||
2c09af30 JM |
1259 | /** |
1260 | * wpa_scan_get_vendor_ie - Fetch vendor information element from a scan result | |
1261 | * @res: Scan result entry | |
1262 | * @vendor_type: Vendor type (four octets starting the IE payload) | |
1263 | * Returns: Pointer to the information element (id field) or %NULL if not found | |
1264 | * | |
1265 | * This function returns the first matching information element in the scan | |
1266 | * result. | |
1267 | */ | |
9ba9fa07 JM |
1268 | const u8 * wpa_scan_get_vendor_ie(const struct wpa_scan_res *res, |
1269 | u32 vendor_type) | |
1270 | { | |
1271 | const u8 *end, *pos; | |
1272 | ||
1273 | pos = (const u8 *) (res + 1); | |
1274 | end = pos + res->ie_len; | |
1275 | ||
1276 | while (pos + 1 < end) { | |
1277 | if (pos + 2 + pos[1] > end) | |
1278 | break; | |
1279 | if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 && | |
1280 | vendor_type == WPA_GET_BE32(&pos[2])) | |
1281 | return pos; | |
1282 | pos += 2 + pos[1]; | |
1283 | } | |
1284 | ||
1285 | return NULL; | |
1286 | } | |
1287 | ||
1288 | ||
2c09af30 JM |
1289 | /** |
1290 | * wpa_scan_get_vendor_ie_multi - Fetch vendor IE data from a scan result | |
1291 | * @res: Scan result entry | |
1292 | * @vendor_type: Vendor type (four octets starting the IE payload) | |
1293 | * Returns: Pointer to the information element payload or %NULL if not found | |
1294 | * | |
1295 | * This function returns concatenated payload of possibly fragmented vendor | |
1296 | * specific information elements in the scan result. The caller is responsible | |
1297 | * for freeing the returned buffer. | |
1298 | */ | |
9ba9fa07 JM |
1299 | struct wpabuf * wpa_scan_get_vendor_ie_multi(const struct wpa_scan_res *res, |
1300 | u32 vendor_type) | |
1301 | { | |
1302 | struct wpabuf *buf; | |
1303 | const u8 *end, *pos; | |
1304 | ||
1305 | buf = wpabuf_alloc(res->ie_len); | |
1306 | if (buf == NULL) | |
1307 | return NULL; | |
1308 | ||
1309 | pos = (const u8 *) (res + 1); | |
1310 | end = pos + res->ie_len; | |
1311 | ||
54f489be JM |
1312 | while (pos + 1 < end) { |
1313 | if (pos + 2 + pos[1] > end) | |
1314 | break; | |
1315 | if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 && | |
1316 | vendor_type == WPA_GET_BE32(&pos[2])) | |
1317 | wpabuf_put_data(buf, pos + 2 + 4, pos[1] - 4); | |
1318 | pos += 2 + pos[1]; | |
1319 | } | |
1320 | ||
1321 | if (wpabuf_len(buf) == 0) { | |
1322 | wpabuf_free(buf); | |
1323 | buf = NULL; | |
1324 | } | |
1325 | ||
1326 | return buf; | |
1327 | } | |
1328 | ||
1329 | ||
577db0ae GM |
1330 | /* |
1331 | * Channels with a great SNR can operate at full rate. What is a great SNR? | |
1332 | * This doc https://supportforums.cisco.com/docs/DOC-12954 says, "the general | |
1333 | * rule of thumb is that any SNR above 20 is good." This one | |
1334 | * http://www.cisco.com/en/US/tech/tk722/tk809/technologies_q_and_a_item09186a00805e9a96.shtml#qa23 | |
1335 | * recommends 25 as a minimum SNR for 54 Mbps data rate. 30 is chosen here as a | |
1336 | * conservative value. | |
1337 | */ | |
1338 | #define GREAT_SNR 30 | |
1339 | ||
9ba9fa07 JM |
1340 | /* Compare function for sorting scan results. Return >0 if @b is considered |
1341 | * better. */ | |
1342 | static int wpa_scan_result_compar(const void *a, const void *b) | |
1343 | { | |
577db0ae GM |
1344 | #define IS_5GHZ(n) (n > 4000) |
1345 | #define MIN(a,b) a < b ? a : b | |
9ba9fa07 JM |
1346 | struct wpa_scan_res **_wa = (void *) a; |
1347 | struct wpa_scan_res **_wb = (void *) b; | |
1348 | struct wpa_scan_res *wa = *_wa; | |
1349 | struct wpa_scan_res *wb = *_wb; | |
1350 | int wpa_a, wpa_b, maxrate_a, maxrate_b; | |
577db0ae | 1351 | int snr_a, snr_b; |
9ba9fa07 JM |
1352 | |
1353 | /* WPA/WPA2 support preferred */ | |
1354 | wpa_a = wpa_scan_get_vendor_ie(wa, WPA_IE_VENDOR_TYPE) != NULL || | |
1355 | wpa_scan_get_ie(wa, WLAN_EID_RSN) != NULL; | |
1356 | wpa_b = wpa_scan_get_vendor_ie(wb, WPA_IE_VENDOR_TYPE) != NULL || | |
1357 | wpa_scan_get_ie(wb, WLAN_EID_RSN) != NULL; | |
1358 | ||
1359 | if (wpa_b && !wpa_a) | |
1360 | return 1; | |
1361 | if (!wpa_b && wpa_a) | |
1362 | return -1; | |
1363 | ||
1364 | /* privacy support preferred */ | |
1365 | if ((wa->caps & IEEE80211_CAP_PRIVACY) == 0 && | |
1366 | (wb->caps & IEEE80211_CAP_PRIVACY)) | |
1367 | return 1; | |
1368 | if ((wa->caps & IEEE80211_CAP_PRIVACY) && | |
1369 | (wb->caps & IEEE80211_CAP_PRIVACY) == 0) | |
1370 | return -1; | |
1371 | ||
577db0ae GM |
1372 | if ((wa->flags & wb->flags & WPA_SCAN_LEVEL_DBM) && |
1373 | !((wa->flags | wb->flags) & WPA_SCAN_NOISE_INVALID)) { | |
1374 | snr_a = MIN(wa->level - wa->noise, GREAT_SNR); | |
1375 | snr_b = MIN(wb->level - wb->noise, GREAT_SNR); | |
1376 | } else { | |
1377 | /* Not suitable information to calculate SNR, so use level */ | |
1378 | snr_a = wa->level; | |
1379 | snr_b = wb->level; | |
1380 | } | |
1381 | ||
577db0ae GM |
1382 | /* best/max rate preferred if SNR close enough */ |
1383 | if ((snr_a && snr_b && abs(snr_b - snr_a) < 5) || | |
9ba9fa07 JM |
1384 | (wa->qual && wb->qual && abs(wb->qual - wa->qual) < 10)) { |
1385 | maxrate_a = wpa_scan_get_max_rate(wa); | |
1386 | maxrate_b = wpa_scan_get_max_rate(wb); | |
1387 | if (maxrate_a != maxrate_b) | |
1388 | return maxrate_b - maxrate_a; | |
577db0ae GM |
1389 | if (IS_5GHZ(wa->freq) ^ IS_5GHZ(wb->freq)) |
1390 | return IS_5GHZ(wa->freq) ? -1 : 1; | |
9ba9fa07 JM |
1391 | } |
1392 | ||
1393 | /* use freq for channel preference */ | |
1394 | ||
577db0ae | 1395 | /* all things being equal, use SNR; if SNRs are |
9ba9fa07 JM |
1396 | * identical, use quality values since some drivers may only report |
1397 | * that value and leave the signal level zero */ | |
577db0ae | 1398 | if (snr_b == snr_a) |
9ba9fa07 | 1399 | return wb->qual - wa->qual; |
577db0ae GM |
1400 | return snr_b - snr_a; |
1401 | #undef MIN | |
1402 | #undef IS_5GHZ | |
9ba9fa07 JM |
1403 | } |
1404 | ||
1405 | ||
41e650ae JM |
1406 | #ifdef CONFIG_WPS |
1407 | /* Compare function for sorting scan results when searching a WPS AP for | |
1408 | * provisioning. Return >0 if @b is considered better. */ | |
1409 | static int wpa_scan_result_wps_compar(const void *a, const void *b) | |
1410 | { | |
1411 | struct wpa_scan_res **_wa = (void *) a; | |
1412 | struct wpa_scan_res **_wb = (void *) b; | |
1413 | struct wpa_scan_res *wa = *_wa; | |
1414 | struct wpa_scan_res *wb = *_wb; | |
1415 | int uses_wps_a, uses_wps_b; | |
1416 | struct wpabuf *wps_a, *wps_b; | |
1417 | int res; | |
1418 | ||
1419 | /* Optimization - check WPS IE existence before allocated memory and | |
1420 | * doing full reassembly. */ | |
1421 | uses_wps_a = wpa_scan_get_vendor_ie(wa, WPS_IE_VENDOR_TYPE) != NULL; | |
1422 | uses_wps_b = wpa_scan_get_vendor_ie(wb, WPS_IE_VENDOR_TYPE) != NULL; | |
1423 | if (uses_wps_a && !uses_wps_b) | |
1424 | return -1; | |
1425 | if (!uses_wps_a && uses_wps_b) | |
1426 | return 1; | |
1427 | ||
1428 | if (uses_wps_a && uses_wps_b) { | |
1429 | wps_a = wpa_scan_get_vendor_ie_multi(wa, WPS_IE_VENDOR_TYPE); | |
1430 | wps_b = wpa_scan_get_vendor_ie_multi(wb, WPS_IE_VENDOR_TYPE); | |
1431 | res = wps_ap_priority_compar(wps_a, wps_b); | |
1432 | wpabuf_free(wps_a); | |
1433 | wpabuf_free(wps_b); | |
1434 | if (res) | |
1435 | return res; | |
1436 | } | |
1437 | ||
1438 | /* | |
1439 | * Do not use current AP security policy as a sorting criteria during | |
1440 | * WPS provisioning step since the AP may get reconfigured at the | |
1441 | * completion of provisioning. | |
1442 | */ | |
1443 | ||
1444 | /* all things being equal, use signal level; if signal levels are | |
1445 | * identical, use quality values since some drivers may only report | |
1446 | * that value and leave the signal level zero */ | |
1447 | if (wb->level == wa->level) | |
1448 | return wb->qual - wa->qual; | |
1449 | return wb->level - wa->level; | |
1450 | } | |
1451 | #endif /* CONFIG_WPS */ | |
1452 | ||
1453 | ||
aa820e02 JM |
1454 | static void dump_scan_res(struct wpa_scan_results *scan_res) |
1455 | { | |
76202aed | 1456 | #ifndef CONFIG_NO_STDOUT_DEBUG |
aa820e02 JM |
1457 | size_t i; |
1458 | ||
1459 | if (scan_res->res == NULL || scan_res->num == 0) | |
1460 | return; | |
1461 | ||
1462 | wpa_printf(MSG_EXCESSIVE, "Sorted scan results"); | |
1463 | ||
1464 | for (i = 0; i < scan_res->num; i++) { | |
1465 | struct wpa_scan_res *r = scan_res->res[i]; | |
1cbe86e2 | 1466 | u8 *pos; |
aa820e02 JM |
1467 | if ((r->flags & (WPA_SCAN_LEVEL_DBM | WPA_SCAN_NOISE_INVALID)) |
1468 | == WPA_SCAN_LEVEL_DBM) { | |
1469 | int snr = r->level - r->noise; | |
1470 | wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d " | |
c5f10e80 JM |
1471 | "noise=%d level=%d snr=%d%s flags=0x%x " |
1472 | "age=%u", | |
aa820e02 JM |
1473 | MAC2STR(r->bssid), r->freq, r->qual, |
1474 | r->noise, r->level, snr, | |
c5f10e80 JM |
1475 | snr >= GREAT_SNR ? "*" : "", r->flags, |
1476 | r->age); | |
aa820e02 JM |
1477 | } else { |
1478 | wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d " | |
c5f10e80 | 1479 | "noise=%d level=%d flags=0x%x age=%u", |
aa820e02 | 1480 | MAC2STR(r->bssid), r->freq, r->qual, |
c5f10e80 | 1481 | r->noise, r->level, r->flags, r->age); |
aa820e02 | 1482 | } |
1cbe86e2 JM |
1483 | pos = (u8 *) (r + 1); |
1484 | if (r->ie_len) | |
1485 | wpa_hexdump(MSG_EXCESSIVE, "IEs", pos, r->ie_len); | |
1486 | pos += r->ie_len; | |
1487 | if (r->beacon_ie_len) | |
1488 | wpa_hexdump(MSG_EXCESSIVE, "Beacon IEs", | |
1489 | pos, r->beacon_ie_len); | |
aa820e02 | 1490 | } |
76202aed | 1491 | #endif /* CONFIG_NO_STDOUT_DEBUG */ |
aa820e02 JM |
1492 | } |
1493 | ||
1494 | ||
2c09af30 JM |
1495 | /** |
1496 | * wpa_supplicant_filter_bssid_match - Is the specified BSSID allowed | |
1497 | * @wpa_s: Pointer to wpa_supplicant data | |
1498 | * @bssid: BSSID to check | |
1499 | * Returns: 0 if the BSSID is filtered or 1 if not | |
1500 | * | |
1501 | * This function is used to filter out specific BSSIDs from scan reslts mainly | |
1502 | * for testing purposes (SET bssid_filter ctrl_iface command). | |
1503 | */ | |
d445a5cd JM |
1504 | int wpa_supplicant_filter_bssid_match(struct wpa_supplicant *wpa_s, |
1505 | const u8 *bssid) | |
1506 | { | |
1507 | size_t i; | |
1508 | ||
1509 | if (wpa_s->bssid_filter == NULL) | |
1510 | return 1; | |
1511 | ||
1512 | for (i = 0; i < wpa_s->bssid_filter_count; i++) { | |
1513 | if (os_memcmp(wpa_s->bssid_filter + i * ETH_ALEN, bssid, | |
1514 | ETH_ALEN) == 0) | |
1515 | return 1; | |
1516 | } | |
1517 | ||
1518 | return 0; | |
1519 | } | |
1520 | ||
1521 | ||
1522 | static void filter_scan_res(struct wpa_supplicant *wpa_s, | |
1523 | struct wpa_scan_results *res) | |
1524 | { | |
1525 | size_t i, j; | |
1526 | ||
1527 | if (wpa_s->bssid_filter == NULL) | |
1528 | return; | |
1529 | ||
1530 | for (i = 0, j = 0; i < res->num; i++) { | |
1531 | if (wpa_supplicant_filter_bssid_match(wpa_s, | |
1532 | res->res[i]->bssid)) { | |
1533 | res->res[j++] = res->res[i]; | |
1534 | } else { | |
1535 | os_free(res->res[i]); | |
1536 | res->res[i] = NULL; | |
1537 | } | |
1538 | } | |
1539 | ||
1540 | if (res->num != j) { | |
1541 | wpa_printf(MSG_DEBUG, "Filtered out %d scan results", | |
1542 | (int) (res->num - j)); | |
1543 | res->num = j; | |
1544 | } | |
1545 | } | |
1546 | ||
1547 | ||
9ba9fa07 JM |
1548 | /** |
1549 | * wpa_supplicant_get_scan_results - Get scan results | |
1550 | * @wpa_s: Pointer to wpa_supplicant data | |
1551 | * @info: Information about what was scanned or %NULL if not available | |
1552 | * @new_scan: Whether a new scan was performed | |
1553 | * Returns: Scan results, %NULL on failure | |
1554 | * | |
1555 | * This function request the current scan results from the driver and updates | |
1556 | * the local BSS list wpa_s->bss. The caller is responsible for freeing the | |
1557 | * results with wpa_scan_results_free(). | |
1558 | */ | |
1559 | struct wpa_scan_results * | |
1560 | wpa_supplicant_get_scan_results(struct wpa_supplicant *wpa_s, | |
1561 | struct scan_info *info, int new_scan) | |
1562 | { | |
1563 | struct wpa_scan_results *scan_res; | |
1564 | size_t i; | |
41e650ae | 1565 | int (*compar)(const void *, const void *) = wpa_scan_result_compar; |
9ba9fa07 | 1566 | |
17fbb751 | 1567 | scan_res = wpa_drv_get_scan_results2(wpa_s); |
9ba9fa07 | 1568 | if (scan_res == NULL) { |
f049052b | 1569 | wpa_dbg(wpa_s, MSG_DEBUG, "Failed to get scan results"); |
9ba9fa07 JM |
1570 | return NULL; |
1571 | } | |
c5f10e80 JM |
1572 | if (scan_res->fetch_time.sec == 0) { |
1573 | /* | |
1574 | * Make sure we have a valid timestamp if the driver wrapper | |
1575 | * does not set this. | |
1576 | */ | |
1577 | os_get_time(&scan_res->fetch_time); | |
1578 | } | |
d445a5cd | 1579 | filter_scan_res(wpa_s, scan_res); |
9ba9fa07 | 1580 | |
41e650ae JM |
1581 | #ifdef CONFIG_WPS |
1582 | if (wpas_wps_in_progress(wpa_s)) { | |
f049052b BG |
1583 | wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Order scan results with WPS " |
1584 | "provisioning rules"); | |
41e650ae JM |
1585 | compar = wpa_scan_result_wps_compar; |
1586 | } | |
1587 | #endif /* CONFIG_WPS */ | |
1588 | ||
9ba9fa07 | 1589 | qsort(scan_res->res, scan_res->num, sizeof(struct wpa_scan_res *), |
41e650ae | 1590 | compar); |
aa820e02 | 1591 | dump_scan_res(scan_res); |
9ba9fa07 JM |
1592 | |
1593 | wpa_bss_update_start(wpa_s); | |
1594 | for (i = 0; i < scan_res->num; i++) | |
c5f10e80 JM |
1595 | wpa_bss_update_scan_res(wpa_s, scan_res->res[i], |
1596 | &scan_res->fetch_time); | |
9ba9fa07 JM |
1597 | wpa_bss_update_end(wpa_s, info, new_scan); |
1598 | ||
1599 | return scan_res; | |
1600 | } | |
1601 | ||
1602 | ||
2c09af30 JM |
1603 | /** |
1604 | * wpa_supplicant_update_scan_results - Update scan results from the driver | |
1605 | * @wpa_s: Pointer to wpa_supplicant data | |
1606 | * Returns: 0 on success, -1 on failure | |
1607 | * | |
1608 | * This function updates the BSS table within wpa_supplicant based on the | |
1609 | * currently available scan results from the driver without requesting a new | |
1610 | * scan. This is used in cases where the driver indicates an association | |
1611 | * (including roaming within ESS) and wpa_supplicant does not yet have the | |
1612 | * needed information to complete the connection (e.g., to perform validation | |
1613 | * steps in 4-way handshake). | |
1614 | */ | |
9ba9fa07 JM |
1615 | int wpa_supplicant_update_scan_results(struct wpa_supplicant *wpa_s) |
1616 | { | |
1617 | struct wpa_scan_results *scan_res; | |
1618 | scan_res = wpa_supplicant_get_scan_results(wpa_s, NULL, 0); | |
1619 | if (scan_res == NULL) | |
1620 | return -1; | |
1621 | wpa_scan_results_free(scan_res); | |
1622 | ||
1623 | return 0; | |
1624 | } | |
66fe0f70 DS |
1625 | |
1626 | ||
1627 | /** | |
1628 | * scan_only_handler - Reports scan results | |
1629 | */ | |
1630 | void scan_only_handler(struct wpa_supplicant *wpa_s, | |
1631 | struct wpa_scan_results *scan_res) | |
1632 | { | |
1633 | wpa_dbg(wpa_s, MSG_DEBUG, "Scan-only results received"); | |
1634 | wpa_msg_ctrl(wpa_s, MSG_INFO, WPA_EVENT_SCAN_RESULTS); | |
1635 | wpas_notify_scan_results(wpa_s); | |
1636 | wpas_notify_scan_done(wpa_s, 1); | |
1637 | } | |
407be00b JM |
1638 | |
1639 | ||
1640 | int wpas_scan_scheduled(struct wpa_supplicant *wpa_s) | |
1641 | { | |
1642 | return eloop_is_timeout_registered(wpa_supplicant_scan, wpa_s, NULL); | |
1643 | } |