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Commit | Line | Data |
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6fc6879b JM |
1 | /* |
2 | * WPA Supplicant - Scanning | |
9ba9fa07 | 3 | * Copyright (c) 2003-2010, Jouni Malinen <j@w1.fi> |
6fc6879b JM |
4 | * |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License version 2 as | |
7 | * published by the Free Software Foundation. | |
8 | * | |
9 | * Alternatively, this software may be distributed under the terms of BSD | |
10 | * license. | |
11 | * | |
12 | * See README and COPYING for more details. | |
13 | */ | |
14 | ||
9ba9fa07 | 15 | #include "utils/includes.h" |
6fc6879b | 16 | |
9ba9fa07 JM |
17 | #include "utils/common.h" |
18 | #include "utils/eloop.h" | |
19 | #include "common/ieee802_11_defs.h" | |
6fc6879b JM |
20 | #include "config.h" |
21 | #include "wpa_supplicant_i.h" | |
2d5b792d | 22 | #include "driver_i.h" |
6fc6879b | 23 | #include "mlme.h" |
b01c18a8 | 24 | #include "wps_supplicant.h" |
0e65037c JM |
25 | #include "p2p_supplicant.h" |
26 | #include "p2p/p2p.h" | |
8bac466b | 27 | #include "notify.h" |
9ba9fa07 JM |
28 | #include "bss.h" |
29 | #include "scan.h" | |
6fc6879b JM |
30 | |
31 | ||
32 | static void wpa_supplicant_gen_assoc_event(struct wpa_supplicant *wpa_s) | |
33 | { | |
34 | struct wpa_ssid *ssid; | |
35 | union wpa_event_data data; | |
36 | ||
37 | ssid = wpa_supplicant_get_ssid(wpa_s); | |
38 | if (ssid == NULL) | |
39 | return; | |
40 | ||
8bac466b | 41 | if (wpa_s->current_ssid == NULL) { |
6fc6879b | 42 | wpa_s->current_ssid = ssid; |
8bac466b JM |
43 | if (wpa_s->current_ssid != NULL) |
44 | wpas_notify_network_changed(wpa_s); | |
45 | } | |
6fc6879b | 46 | wpa_supplicant_initiate_eapol(wpa_s); |
f049052b BG |
47 | wpa_dbg(wpa_s, MSG_DEBUG, "Already associated with a configured " |
48 | "network - generating associated event"); | |
6fc6879b JM |
49 | os_memset(&data, 0, sizeof(data)); |
50 | wpa_supplicant_event(wpa_s, EVENT_ASSOC, &data); | |
51 | } | |
52 | ||
53 | ||
ad08c363 | 54 | #ifdef CONFIG_WPS |
5f738a21 | 55 | static int wpas_wps_in_use(struct wpa_supplicant *wpa_s, |
f90c86d4 | 56 | enum wps_request_type *req_type) |
ad08c363 JM |
57 | { |
58 | struct wpa_ssid *ssid; | |
59 | int wps = 0; | |
ad08c363 | 60 | |
5f738a21 | 61 | for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) { |
ad08c363 JM |
62 | if (!(ssid->key_mgmt & WPA_KEY_MGMT_WPS)) |
63 | continue; | |
64 | ||
65 | wps = 1; | |
b01c18a8 | 66 | *req_type = wpas_wps_get_req_type(ssid); |
ad08c363 JM |
67 | if (!ssid->eap.phase1) |
68 | continue; | |
69 | ||
ad08c363 JM |
70 | if (os_strstr(ssid->eap.phase1, "pbc=1")) |
71 | return 2; | |
72 | } | |
73 | ||
5f738a21 LC |
74 | #ifdef CONFIG_P2P |
75 | wpa_s->wps->dev.p2p = 1; | |
76 | if (!wps) { | |
77 | wps = 1; | |
78 | *req_type = WPS_REQ_ENROLLEE_INFO; | |
79 | } | |
80 | #endif /* CONFIG_P2P */ | |
81 | ||
ad08c363 JM |
82 | return wps; |
83 | } | |
84 | #endif /* CONFIG_WPS */ | |
85 | ||
e76baaac | 86 | |
4f34d51a | 87 | int wpa_supplicant_enabled_networks(struct wpa_config *conf) |
e76baaac JM |
88 | { |
89 | struct wpa_ssid *ssid = conf->ssid; | |
5471c343 | 90 | int count = 0; |
e76baaac JM |
91 | while (ssid) { |
92 | if (!ssid->disabled) | |
5471c343 | 93 | count++; |
e76baaac JM |
94 | ssid = ssid->next; |
95 | } | |
5471c343 | 96 | return count; |
e76baaac JM |
97 | } |
98 | ||
99 | ||
100 | static void wpa_supplicant_assoc_try(struct wpa_supplicant *wpa_s, | |
101 | struct wpa_ssid *ssid) | |
102 | { | |
103 | while (ssid) { | |
104 | if (!ssid->disabled) | |
105 | break; | |
106 | ssid = ssid->next; | |
107 | } | |
108 | ||
109 | /* ap_scan=2 mode - try to associate with each SSID. */ | |
110 | if (ssid == NULL) { | |
f049052b BG |
111 | wpa_dbg(wpa_s, MSG_DEBUG, "wpa_supplicant_assoc_try: Reached " |
112 | "end of scan list - go back to beginning"); | |
ba2a573c | 113 | wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN; |
e76baaac JM |
114 | wpa_supplicant_req_scan(wpa_s, 0, 0); |
115 | return; | |
116 | } | |
117 | if (ssid->next) { | |
118 | /* Continue from the next SSID on the next attempt. */ | |
119 | wpa_s->prev_scan_ssid = ssid; | |
120 | } else { | |
121 | /* Start from the beginning of the SSID list. */ | |
ba2a573c | 122 | wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN; |
e76baaac JM |
123 | } |
124 | wpa_supplicant_associate(wpa_s, NULL, ssid); | |
125 | } | |
126 | ||
127 | ||
d3a98225 JM |
128 | static int int_array_len(const int *a) |
129 | { | |
130 | int i; | |
131 | for (i = 0; a && a[i]; i++) | |
132 | ; | |
133 | return i; | |
134 | } | |
135 | ||
136 | ||
137 | static void int_array_concat(int **res, const int *a) | |
138 | { | |
139 | int reslen, alen, i; | |
140 | int *n; | |
141 | ||
142 | reslen = int_array_len(*res); | |
143 | alen = int_array_len(a); | |
144 | ||
145 | n = os_realloc(*res, (reslen + alen + 1) * sizeof(int)); | |
146 | if (n == NULL) { | |
147 | os_free(*res); | |
148 | *res = NULL; | |
e6c0ebff | 149 | return; |
d3a98225 JM |
150 | } |
151 | for (i = 0; i <= alen; i++) | |
152 | n[reslen + i] = a[i]; | |
153 | *res = n; | |
154 | } | |
155 | ||
156 | ||
157 | static int freq_cmp(const void *a, const void *b) | |
158 | { | |
159 | int _a = *(int *) a; | |
160 | int _b = *(int *) b; | |
161 | ||
162 | if (_a == 0) | |
163 | return 1; | |
164 | if (_b == 0) | |
165 | return -1; | |
166 | return _a - _b; | |
167 | } | |
168 | ||
169 | ||
170 | static void int_array_sort_unique(int *a) | |
171 | { | |
172 | int alen; | |
173 | int i, j; | |
174 | ||
175 | if (a == NULL) | |
176 | return; | |
177 | ||
178 | alen = int_array_len(a); | |
179 | qsort(a, alen, sizeof(int), freq_cmp); | |
180 | ||
181 | i = 0; | |
182 | j = 1; | |
183 | while (a[i] && a[j]) { | |
184 | if (a[i] == a[j]) { | |
185 | j++; | |
186 | continue; | |
187 | } | |
188 | a[++i] = a[j++]; | |
189 | } | |
190 | if (a[i]) | |
191 | i++; | |
192 | a[i] = 0; | |
193 | } | |
194 | ||
195 | ||
60b94c98 JM |
196 | int wpa_supplicant_trigger_scan(struct wpa_supplicant *wpa_s, |
197 | struct wpa_driver_scan_params *params) | |
198 | { | |
199 | int ret; | |
200 | ||
201 | wpa_supplicant_notify_scanning(wpa_s, 1); | |
202 | ||
d009a9da JM |
203 | if (wpa_s->drv_flags & WPA_DRIVER_FLAGS_USER_SPACE_MLME) |
204 | ret = ieee80211_sta_req_scan(wpa_s, params); | |
205 | else | |
60b94c98 | 206 | ret = wpa_drv_scan(wpa_s, params); |
60b94c98 JM |
207 | |
208 | if (ret) { | |
209 | wpa_supplicant_notify_scanning(wpa_s, 0); | |
210 | wpas_notify_scan_done(wpa_s, 0); | |
211 | } else | |
212 | wpa_s->scan_runs++; | |
213 | ||
214 | return ret; | |
215 | } | |
216 | ||
217 | ||
6a90053c LC |
218 | static void |
219 | wpa_supplicant_delayed_sched_scan_timeout(void *eloop_ctx, void *timeout_ctx) | |
220 | { | |
221 | struct wpa_supplicant *wpa_s = eloop_ctx; | |
222 | ||
223 | wpa_dbg(wpa_s, MSG_DEBUG, "Starting delayed sched scan"); | |
224 | ||
225 | if (wpa_supplicant_req_sched_scan(wpa_s)) | |
226 | wpa_supplicant_req_scan(wpa_s, 0, 0); | |
227 | } | |
228 | ||
229 | ||
cbdf3507 LC |
230 | static void |
231 | wpa_supplicant_sched_scan_timeout(void *eloop_ctx, void *timeout_ctx) | |
232 | { | |
233 | struct wpa_supplicant *wpa_s = eloop_ctx; | |
234 | ||
235 | wpa_dbg(wpa_s, MSG_DEBUG, "Sched scan timeout - stopping it"); | |
236 | ||
237 | wpa_s->sched_scan_timed_out = 1; | |
238 | wpa_supplicant_cancel_sched_scan(wpa_s); | |
239 | } | |
240 | ||
241 | ||
242 | static int | |
243 | wpa_supplicant_start_sched_scan(struct wpa_supplicant *wpa_s, | |
244 | struct wpa_driver_scan_params *params, | |
245 | int interval) | |
246 | { | |
247 | int ret; | |
248 | ||
249 | if (wpa_s->drv_flags & WPA_DRIVER_FLAGS_USER_SPACE_MLME) | |
250 | return -1; | |
251 | ||
252 | wpa_supplicant_notify_scanning(wpa_s, 1); | |
253 | ret = wpa_drv_sched_scan(wpa_s, params, interval * 1000); | |
254 | if (ret) | |
255 | wpa_supplicant_notify_scanning(wpa_s, 0); | |
256 | else | |
257 | wpa_s->sched_scanning = 1; | |
258 | ||
259 | return ret; | |
260 | } | |
261 | ||
262 | ||
263 | static int wpa_supplicant_stop_sched_scan(struct wpa_supplicant *wpa_s) | |
264 | { | |
265 | int ret; | |
266 | ||
267 | ret = wpa_drv_stop_sched_scan(wpa_s); | |
268 | if (ret) { | |
269 | wpa_dbg(wpa_s, MSG_DEBUG, "stopping sched_scan failed!"); | |
270 | /* TODO: what to do if stopping fails? */ | |
271 | return -1; | |
272 | } | |
273 | ||
274 | return ret; | |
275 | } | |
276 | ||
277 | ||
3812464c JM |
278 | static struct wpa_driver_scan_filter * |
279 | wpa_supplicant_build_filter_ssids(struct wpa_config *conf, size_t *num_ssids) | |
280 | { | |
281 | struct wpa_driver_scan_filter *ssids; | |
282 | struct wpa_ssid *ssid; | |
283 | size_t count; | |
284 | ||
285 | *num_ssids = 0; | |
286 | if (!conf->filter_ssids) | |
287 | return NULL; | |
288 | ||
289 | for (count = 0, ssid = conf->ssid; ssid; ssid = ssid->next) { | |
290 | if (ssid->ssid && ssid->ssid_len) | |
291 | count++; | |
292 | } | |
293 | if (count == 0) | |
294 | return NULL; | |
295 | ssids = os_zalloc(count * sizeof(struct wpa_driver_scan_filter)); | |
296 | if (ssids == NULL) | |
297 | return NULL; | |
298 | ||
299 | for (ssid = conf->ssid; ssid; ssid = ssid->next) { | |
300 | if (!ssid->ssid || !ssid->ssid_len) | |
301 | continue; | |
302 | os_memcpy(ssids[*num_ssids].ssid, ssid->ssid, ssid->ssid_len); | |
303 | ssids[*num_ssids].ssid_len = ssid->ssid_len; | |
304 | (*num_ssids)++; | |
305 | } | |
306 | ||
307 | return ssids; | |
308 | } | |
309 | ||
310 | ||
5f738a21 LC |
311 | static void wpa_supplicant_optimize_freqs( |
312 | struct wpa_supplicant *wpa_s, struct wpa_driver_scan_params *params) | |
313 | { | |
314 | #ifdef CONFIG_P2P | |
315 | if (params->freqs == NULL && wpa_s->p2p_in_provisioning && | |
316 | wpa_s->go_params) { | |
317 | /* Optimize provisioning state scan based on GO information */ | |
318 | if (wpa_s->p2p_in_provisioning < 5 && | |
319 | wpa_s->go_params->freq > 0) { | |
320 | wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only GO " | |
321 | "preferred frequency %d MHz", | |
322 | wpa_s->go_params->freq); | |
323 | params->freqs = os_zalloc(2 * sizeof(int)); | |
324 | if (params->freqs) | |
325 | params->freqs[0] = wpa_s->go_params->freq; | |
326 | } else if (wpa_s->p2p_in_provisioning < 8 && | |
327 | wpa_s->go_params->freq_list[0]) { | |
328 | wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only common " | |
329 | "channels"); | |
330 | int_array_concat(¶ms->freqs, | |
331 | wpa_s->go_params->freq_list); | |
332 | if (params->freqs) | |
333 | int_array_sort_unique(params->freqs); | |
334 | } | |
335 | wpa_s->p2p_in_provisioning++; | |
336 | } | |
337 | #endif /* CONFIG_P2P */ | |
338 | ||
339 | #ifdef CONFIG_WPS | |
340 | if (params->freqs == NULL && wpa_s->after_wps && wpa_s->wps_freq) { | |
341 | /* | |
342 | * Optimize post-provisioning scan based on channel used | |
343 | * during provisioning. | |
344 | */ | |
345 | wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Scan only frequency %u MHz " | |
346 | "that was used during provisioning", wpa_s->wps_freq); | |
347 | params->freqs = os_zalloc(2 * sizeof(int)); | |
348 | if (params->freqs) | |
349 | params->freqs[0] = wpa_s->wps_freq; | |
350 | wpa_s->after_wps--; | |
351 | } | |
352 | ||
353 | #endif /* CONFIG_WPS */ | |
354 | } | |
355 | ||
356 | ||
46ee0427 JM |
357 | #ifdef CONFIG_INTERWORKING |
358 | static void wpas_add_interworking_elements(struct wpa_supplicant *wpa_s, | |
359 | struct wpabuf *buf) | |
360 | { | |
361 | if (wpa_s->conf->interworking == 0) | |
362 | return; | |
363 | ||
364 | wpabuf_put_u8(buf, WLAN_EID_EXT_CAPAB); | |
365 | wpabuf_put_u8(buf, 4); | |
366 | wpabuf_put_u8(buf, 0x00); | |
367 | wpabuf_put_u8(buf, 0x00); | |
368 | wpabuf_put_u8(buf, 0x00); | |
369 | wpabuf_put_u8(buf, 0x80); /* Bit 31 - Interworking */ | |
370 | ||
371 | wpabuf_put_u8(buf, WLAN_EID_INTERWORKING); | |
372 | wpabuf_put_u8(buf, is_zero_ether_addr(wpa_s->conf->hessid) ? 1 : | |
373 | 1 + ETH_ALEN); | |
11540c0b | 374 | wpabuf_put_u8(buf, wpa_s->conf->access_network_type); |
46ee0427 JM |
375 | /* No Venue Info */ |
376 | if (!is_zero_ether_addr(wpa_s->conf->hessid)) | |
377 | wpabuf_put_data(buf, wpa_s->conf->hessid, ETH_ALEN); | |
378 | } | |
379 | #endif /* CONFIG_INTERWORKING */ | |
380 | ||
381 | ||
5f738a21 LC |
382 | static struct wpabuf * |
383 | wpa_supplicant_extra_ies(struct wpa_supplicant *wpa_s, | |
384 | struct wpa_driver_scan_params *params) | |
6fc6879b | 385 | { |
46ee0427 | 386 | struct wpabuf *extra_ie = NULL; |
b01c18a8 | 387 | #ifdef CONFIG_WPS |
509a3972 | 388 | int wps = 0; |
f90c86d4 | 389 | enum wps_request_type req_type = WPS_REQ_ENROLLEE_INFO; |
46ee0427 JM |
390 | #endif /* CONFIG_WPS */ |
391 | ||
392 | #ifdef CONFIG_INTERWORKING | |
393 | if (wpa_s->conf->interworking && | |
394 | wpabuf_resize(&extra_ie, 100) == 0) | |
395 | wpas_add_interworking_elements(wpa_s, extra_ie); | |
396 | #endif /* CONFIG_INTERWORKING */ | |
5f738a21 | 397 | |
46ee0427 | 398 | #ifdef CONFIG_WPS |
5f738a21 LC |
399 | wps = wpas_wps_in_use(wpa_s, &req_type); |
400 | ||
401 | if (wps) { | |
46ee0427 | 402 | struct wpabuf *wps_ie; |
5f738a21 LC |
403 | wps_ie = wps_build_probe_req_ie(wps == 2, &wpa_s->wps->dev, |
404 | wpa_s->wps->uuid, req_type, | |
405 | 0, NULL); | |
406 | if (wps_ie) { | |
46ee0427 JM |
407 | if (wpabuf_resize(&extra_ie, wpabuf_len(wps_ie)) == 0) |
408 | wpabuf_put_buf(extra_ie, wps_ie); | |
409 | wpabuf_free(wps_ie); | |
5f738a21 LC |
410 | } |
411 | } | |
412 | ||
413 | #ifdef CONFIG_P2P | |
46ee0427 | 414 | if (wps) { |
5f738a21 | 415 | size_t ielen = p2p_scan_ie_buf_len(wpa_s->global->p2p); |
46ee0427 JM |
416 | if (wpabuf_resize(&extra_ie, ielen) == 0) |
417 | wpas_p2p_scan_ie(wpa_s, extra_ie); | |
5f738a21 LC |
418 | } |
419 | #endif /* CONFIG_P2P */ | |
420 | ||
b01c18a8 | 421 | #endif /* CONFIG_WPS */ |
5f738a21 | 422 | |
46ee0427 | 423 | return extra_ie; |
5f738a21 LC |
424 | } |
425 | ||
426 | ||
427 | static void wpa_supplicant_scan(void *eloop_ctx, void *timeout_ctx) | |
428 | { | |
429 | struct wpa_supplicant *wpa_s = eloop_ctx; | |
430 | struct wpa_ssid *ssid; | |
431 | int scan_req = 0, ret; | |
46ee0427 | 432 | struct wpabuf *extra_ie; |
e76baaac JM |
433 | struct wpa_driver_scan_params params; |
434 | size_t max_ssids; | |
207ef3fb | 435 | enum wpa_states prev_state; |
6fc6879b | 436 | |
8401a6b0 | 437 | if (wpa_s->wpa_state == WPA_INTERFACE_DISABLED) { |
f049052b | 438 | wpa_dbg(wpa_s, MSG_DEBUG, "Skip scan - interface disabled"); |
8401a6b0 JM |
439 | return; |
440 | } | |
441 | ||
3180d7a2 SO |
442 | if (wpa_s->disconnected && !wpa_s->scan_req) { |
443 | wpa_supplicant_set_state(wpa_s, WPA_DISCONNECTED); | |
6fc6879b | 444 | return; |
3180d7a2 | 445 | } |
6fc6879b | 446 | |
e76baaac JM |
447 | if (!wpa_supplicant_enabled_networks(wpa_s->conf) && |
448 | !wpa_s->scan_req) { | |
f049052b | 449 | wpa_dbg(wpa_s, MSG_DEBUG, "No enabled networks - do not scan"); |
6fc6879b JM |
450 | wpa_supplicant_set_state(wpa_s, WPA_INACTIVE); |
451 | return; | |
452 | } | |
6fc6879b | 453 | |
c2a04078 JM |
454 | if (wpa_s->conf->ap_scan != 0 && |
455 | (wpa_s->drv_flags & WPA_DRIVER_FLAGS_WIRED)) { | |
f049052b BG |
456 | wpa_dbg(wpa_s, MSG_DEBUG, "Using wired authentication - " |
457 | "overriding ap_scan configuration"); | |
6fc6879b | 458 | wpa_s->conf->ap_scan = 0; |
8bac466b | 459 | wpas_notify_ap_scan_changed(wpa_s); |
6fc6879b JM |
460 | } |
461 | ||
462 | if (wpa_s->conf->ap_scan == 0) { | |
463 | wpa_supplicant_gen_assoc_event(wpa_s); | |
464 | return; | |
465 | } | |
466 | ||
303f60d3 JM |
467 | #ifdef CONFIG_P2P |
468 | if (wpas_p2p_in_progress(wpa_s)) { | |
469 | if (wpa_s->wpa_state == WPA_SCANNING) { | |
470 | wpa_dbg(wpa_s, MSG_DEBUG, "Delay station mode scan " | |
471 | "while P2P operation is in progress"); | |
472 | wpa_supplicant_req_scan(wpa_s, 5, 0); | |
473 | } else { | |
474 | wpa_dbg(wpa_s, MSG_DEBUG, "Do not request scan while " | |
475 | "P2P operation is in progress"); | |
476 | } | |
477 | return; | |
478 | } | |
479 | #endif /* CONFIG_P2P */ | |
480 | ||
c2a04078 JM |
481 | if ((wpa_s->drv_flags & WPA_DRIVER_FLAGS_USER_SPACE_MLME) || |
482 | wpa_s->conf->ap_scan == 2) | |
e76baaac JM |
483 | max_ssids = 1; |
484 | else { | |
485 | max_ssids = wpa_s->max_scan_ssids; | |
486 | if (max_ssids > WPAS_MAX_SCAN_SSIDS) | |
487 | max_ssids = WPAS_MAX_SCAN_SSIDS; | |
488 | } | |
489 | ||
e76baaac JM |
490 | scan_req = wpa_s->scan_req; |
491 | wpa_s->scan_req = 0; | |
492 | ||
493 | os_memset(¶ms, 0, sizeof(params)); | |
494 | ||
207ef3fb | 495 | prev_state = wpa_s->wpa_state; |
6fc6879b JM |
496 | if (wpa_s->wpa_state == WPA_DISCONNECTED || |
497 | wpa_s->wpa_state == WPA_INACTIVE) | |
498 | wpa_supplicant_set_state(wpa_s, WPA_SCANNING); | |
499 | ||
7dcdcfd6 JM |
500 | if (scan_req != 2 && wpa_s->connect_without_scan) { |
501 | for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) { | |
502 | if (ssid == wpa_s->connect_without_scan) | |
503 | break; | |
504 | } | |
505 | wpa_s->connect_without_scan = NULL; | |
506 | if (ssid) { | |
507 | wpa_printf(MSG_DEBUG, "Start a pre-selected network " | |
508 | "without scan step"); | |
509 | wpa_supplicant_associate(wpa_s, NULL, ssid); | |
510 | return; | |
511 | } | |
512 | } | |
513 | ||
e76baaac | 514 | /* Find the starting point from which to continue scanning */ |
6fc6879b | 515 | ssid = wpa_s->conf->ssid; |
ba2a573c | 516 | if (wpa_s->prev_scan_ssid != WILDCARD_SSID_SCAN) { |
6fc6879b JM |
517 | while (ssid) { |
518 | if (ssid == wpa_s->prev_scan_ssid) { | |
519 | ssid = ssid->next; | |
520 | break; | |
521 | } | |
522 | ssid = ssid->next; | |
523 | } | |
524 | } | |
6fc6879b | 525 | |
7dcdcfd6 JM |
526 | if (scan_req != 2 && wpa_s->conf->ap_scan == 2) { |
527 | wpa_s->connect_without_scan = NULL; | |
e76baaac JM |
528 | wpa_supplicant_assoc_try(wpa_s, ssid); |
529 | return; | |
530 | } else if (wpa_s->conf->ap_scan == 2) { | |
6fc6879b | 531 | /* |
ba2a573c JM |
532 | * User-initiated scan request in ap_scan == 2; scan with |
533 | * wildcard SSID. | |
6fc6879b | 534 | */ |
e76baaac JM |
535 | ssid = NULL; |
536 | } else { | |
5be45e2e | 537 | struct wpa_ssid *start = ssid, *tssid; |
d3a98225 | 538 | int freqs_set = 0; |
e76baaac JM |
539 | if (ssid == NULL && max_ssids > 1) |
540 | ssid = wpa_s->conf->ssid; | |
541 | while (ssid) { | |
542 | if (!ssid->disabled && ssid->scan_ssid) { | |
543 | wpa_hexdump_ascii(MSG_DEBUG, "Scan SSID", | |
544 | ssid->ssid, ssid->ssid_len); | |
545 | params.ssids[params.num_ssids].ssid = | |
546 | ssid->ssid; | |
547 | params.ssids[params.num_ssids].ssid_len = | |
548 | ssid->ssid_len; | |
549 | params.num_ssids++; | |
550 | if (params.num_ssids + 1 >= max_ssids) | |
551 | break; | |
552 | } | |
553 | ssid = ssid->next; | |
554 | if (ssid == start) | |
555 | break; | |
556 | if (ssid == NULL && max_ssids > 1 && | |
557 | start != wpa_s->conf->ssid) | |
558 | ssid = wpa_s->conf->ssid; | |
6fc6879b | 559 | } |
d3a98225 | 560 | |
5be45e2e JM |
561 | for (tssid = wpa_s->conf->ssid; tssid; tssid = tssid->next) { |
562 | if (tssid->disabled) | |
d3a98225 | 563 | continue; |
5be45e2e | 564 | if ((params.freqs || !freqs_set) && tssid->scan_freq) { |
d3a98225 | 565 | int_array_concat(¶ms.freqs, |
5be45e2e | 566 | tssid->scan_freq); |
d3a98225 JM |
567 | } else { |
568 | os_free(params.freqs); | |
569 | params.freqs = NULL; | |
570 | } | |
571 | freqs_set = 1; | |
572 | } | |
573 | int_array_sort_unique(params.freqs); | |
6fc6879b JM |
574 | } |
575 | ||
6fc6879b | 576 | if (ssid) { |
6fc6879b | 577 | wpa_s->prev_scan_ssid = ssid; |
e76baaac | 578 | if (max_ssids > 1) { |
f049052b BG |
579 | wpa_dbg(wpa_s, MSG_DEBUG, "Include wildcard SSID in " |
580 | "the scan request"); | |
ba2a573c | 581 | params.num_ssids++; |
e76baaac | 582 | } |
f049052b BG |
583 | wpa_dbg(wpa_s, MSG_DEBUG, "Starting AP scan for specific " |
584 | "SSID(s)"); | |
e76baaac | 585 | } else { |
ba2a573c | 586 | wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN; |
e76baaac | 587 | params.num_ssids++; |
f049052b BG |
588 | wpa_dbg(wpa_s, MSG_DEBUG, "Starting AP scan for wildcard " |
589 | "SSID"); | |
6fc6879b JM |
590 | } |
591 | ||
5f738a21 | 592 | wpa_supplicant_optimize_freqs(wpa_s, ¶ms); |
46ee0427 | 593 | extra_ie = wpa_supplicant_extra_ies(wpa_s, ¶ms); |
0e65037c | 594 | |
f47d639d | 595 | if (params.freqs == NULL && wpa_s->next_scan_freqs) { |
f049052b BG |
596 | wpa_dbg(wpa_s, MSG_DEBUG, "Optimize scan based on previously " |
597 | "generated frequency list"); | |
f47d639d JM |
598 | params.freqs = wpa_s->next_scan_freqs; |
599 | } else | |
600 | os_free(wpa_s->next_scan_freqs); | |
601 | wpa_s->next_scan_freqs = NULL; | |
602 | ||
3812464c JM |
603 | params.filter_ssids = wpa_supplicant_build_filter_ssids( |
604 | wpa_s->conf, ¶ms.num_filter_ssids); | |
46ee0427 JM |
605 | if (extra_ie) { |
606 | params.extra_ies = wpabuf_head(extra_ie); | |
607 | params.extra_ies_len = wpabuf_len(extra_ie); | |
608 | } | |
3812464c | 609 | |
60b94c98 | 610 | ret = wpa_supplicant_trigger_scan(wpa_s, ¶ms); |
6fc6879b | 611 | |
46ee0427 | 612 | wpabuf_free(extra_ie); |
d3a98225 | 613 | os_free(params.freqs); |
3812464c | 614 | os_free(params.filter_ssids); |
ad08c363 | 615 | |
6fc6879b | 616 | if (ret) { |
f049052b | 617 | wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate AP scan"); |
207ef3fb JM |
618 | if (prev_state != wpa_s->wpa_state) |
619 | wpa_supplicant_set_state(wpa_s, prev_state); | |
1c4c9c50 | 620 | wpa_supplicant_req_scan(wpa_s, 1, 0); |
d902a9c1 | 621 | } |
6fc6879b JM |
622 | } |
623 | ||
624 | ||
625 | /** | |
626 | * wpa_supplicant_req_scan - Schedule a scan for neighboring access points | |
627 | * @wpa_s: Pointer to wpa_supplicant data | |
628 | * @sec: Number of seconds after which to scan | |
629 | * @usec: Number of microseconds after which to scan | |
630 | * | |
631 | * This function is used to schedule a scan for neighboring access points after | |
632 | * the specified time. | |
633 | */ | |
634 | void wpa_supplicant_req_scan(struct wpa_supplicant *wpa_s, int sec, int usec) | |
635 | { | |
7e148849 DW |
636 | /* If there's at least one network that should be specifically scanned |
637 | * then don't cancel the scan and reschedule. Some drivers do | |
638 | * background scanning which generates frequent scan results, and that | |
639 | * causes the specific SSID scan to get continually pushed back and | |
640 | * never happen, which causes hidden APs to never get probe-scanned. | |
641 | */ | |
642 | if (eloop_is_timeout_registered(wpa_supplicant_scan, wpa_s, NULL) && | |
643 | wpa_s->conf->ap_scan == 1) { | |
644 | struct wpa_ssid *ssid = wpa_s->conf->ssid; | |
645 | ||
646 | while (ssid) { | |
647 | if (!ssid->disabled && ssid->scan_ssid) | |
648 | break; | |
649 | ssid = ssid->next; | |
650 | } | |
651 | if (ssid) { | |
f049052b | 652 | wpa_dbg(wpa_s, MSG_DEBUG, "Not rescheduling scan to " |
7e148849 DW |
653 | "ensure that specific SSID scans occur"); |
654 | return; | |
655 | } | |
656 | } | |
657 | ||
f049052b | 658 | wpa_dbg(wpa_s, MSG_DEBUG, "Setting scan request: %d sec %d usec", |
6fc6879b JM |
659 | sec, usec); |
660 | eloop_cancel_timeout(wpa_supplicant_scan, wpa_s, NULL); | |
661 | eloop_register_timeout(sec, usec, wpa_supplicant_scan, wpa_s, NULL); | |
662 | } | |
663 | ||
664 | ||
6a90053c LC |
665 | /** |
666 | * wpa_supplicant_delayed_sched_scan - Request a delayed scheduled scan | |
667 | * @wpa_s: Pointer to wpa_supplicant data | |
668 | * @sec: Number of seconds after which to scan | |
669 | * @usec: Number of microseconds after which to scan | |
670 | * | |
671 | * This function is used to schedule periodic scans for neighboring | |
672 | * access points after the specified time. | |
673 | */ | |
674 | int wpa_supplicant_delayed_sched_scan(struct wpa_supplicant *wpa_s, | |
675 | int sec, int usec) | |
676 | { | |
677 | if (!wpa_s->sched_scan_supported) | |
678 | return -1; | |
679 | ||
680 | eloop_register_timeout(sec, usec, | |
681 | wpa_supplicant_delayed_sched_scan_timeout, | |
682 | wpa_s, NULL); | |
683 | ||
684 | return 0; | |
685 | } | |
686 | ||
687 | ||
cbdf3507 LC |
688 | /** |
689 | * wpa_supplicant_req_sched_scan - Start a periodic scheduled scan | |
690 | * @wpa_s: Pointer to wpa_supplicant data | |
691 | * | |
692 | * This function is used to schedule periodic scans for neighboring | |
693 | * access points repeating the scan continuously. | |
694 | */ | |
695 | int wpa_supplicant_req_sched_scan(struct wpa_supplicant *wpa_s) | |
696 | { | |
697 | struct wpa_driver_scan_params params; | |
698 | enum wpa_states prev_state; | |
699 | struct wpa_ssid *ssid; | |
700 | struct wpabuf *wps_ie = NULL; | |
701 | int ret; | |
cbdf3507 LC |
702 | unsigned int max_sched_scan_ssids; |
703 | ||
704 | if (!wpa_s->sched_scan_supported) | |
705 | return -1; | |
706 | ||
707 | if (wpa_s->max_sched_scan_ssids > WPAS_MAX_SCAN_SSIDS) | |
708 | max_sched_scan_ssids = WPAS_MAX_SCAN_SSIDS; | |
709 | else | |
710 | max_sched_scan_ssids = wpa_s->max_sched_scan_ssids; | |
711 | ||
712 | if (wpa_s->sched_scanning) | |
713 | return 0; | |
714 | ||
715 | os_memset(¶ms, 0, sizeof(params)); | |
716 | ||
b59e6f26 LC |
717 | /* If we can't allocate space for the filters, we just don't filter */ |
718 | params.filter_ssids = os_zalloc(wpa_s->max_match_sets * | |
719 | sizeof(struct wpa_driver_scan_filter)); | |
720 | ||
cbdf3507 LC |
721 | prev_state = wpa_s->wpa_state; |
722 | if (wpa_s->wpa_state == WPA_DISCONNECTED || | |
723 | wpa_s->wpa_state == WPA_INACTIVE) | |
724 | wpa_supplicant_set_state(wpa_s, WPA_SCANNING); | |
725 | ||
726 | /* Find the starting point from which to continue scanning */ | |
727 | ssid = wpa_s->conf->ssid; | |
728 | if (wpa_s->prev_sched_ssid) { | |
729 | while (ssid) { | |
730 | if (ssid == wpa_s->prev_sched_ssid) { | |
731 | ssid = ssid->next; | |
732 | break; | |
733 | } | |
734 | ssid = ssid->next; | |
735 | } | |
736 | } | |
737 | ||
738 | if (!ssid || !wpa_s->prev_sched_ssid) { | |
739 | wpa_dbg(wpa_s, MSG_DEBUG, "Beginning of SSID list"); | |
740 | ||
741 | wpa_s->sched_scan_interval = 2; | |
742 | wpa_s->sched_scan_timeout = max_sched_scan_ssids * 2; | |
743 | wpa_s->first_sched_scan = 1; | |
744 | ssid = wpa_s->conf->ssid; | |
745 | wpa_s->prev_sched_ssid = ssid; | |
746 | } | |
747 | ||
748 | while (ssid) { | |
749 | if (ssid->disabled) { | |
750 | wpa_s->prev_sched_ssid = ssid; | |
751 | ssid = ssid->next; | |
752 | continue; | |
753 | } | |
754 | ||
b59e6f26 LC |
755 | if (params.filter_ssids && ssid->ssid && ssid->ssid_len) { |
756 | os_memcpy(params.filter_ssids[params.num_filter_ssids].ssid, | |
757 | ssid->ssid, ssid->ssid_len); | |
758 | params.filter_ssids[params.num_filter_ssids].ssid_len = | |
759 | ssid->ssid_len; | |
760 | params.num_filter_ssids++; | |
761 | } | |
762 | ||
763 | if (ssid->scan_ssid) { | |
cbdf3507 LC |
764 | params.ssids[params.num_ssids].ssid = |
765 | ssid->ssid; | |
766 | params.ssids[params.num_ssids].ssid_len = | |
767 | ssid->ssid_len; | |
768 | params.num_ssids++; | |
b59e6f26 | 769 | if (params.num_ssids >= max_sched_scan_ssids) { |
cbdf3507 LC |
770 | wpa_s->prev_sched_ssid = ssid; |
771 | break; | |
772 | } | |
773 | } | |
b59e6f26 LC |
774 | |
775 | if (params.num_filter_ssids >= wpa_s->max_match_sets) | |
776 | break; | |
cbdf3507 LC |
777 | wpa_s->prev_sched_ssid = ssid; |
778 | ssid = ssid->next; | |
779 | } | |
780 | ||
b59e6f26 LC |
781 | if (!params.num_ssids) { |
782 | os_free(params.filter_ssids); | |
cbdf3507 | 783 | return 0; |
b59e6f26 | 784 | } |
cbdf3507 LC |
785 | |
786 | if (wpa_s->wps) | |
787 | wps_ie = wpa_supplicant_extra_ies(wpa_s, ¶ms); | |
788 | ||
789 | wpa_dbg(wpa_s, MSG_DEBUG, | |
790 | "Starting sched scan: interval %d timeout %d", | |
791 | wpa_s->sched_scan_interval, wpa_s->sched_scan_timeout); | |
792 | ||
793 | ret = wpa_supplicant_start_sched_scan(wpa_s, ¶ms, | |
794 | wpa_s->sched_scan_interval); | |
795 | wpabuf_free(wps_ie); | |
b59e6f26 | 796 | os_free(params.filter_ssids); |
cbdf3507 LC |
797 | if (ret) { |
798 | wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate sched scan"); | |
799 | if (prev_state != wpa_s->wpa_state) | |
800 | wpa_supplicant_set_state(wpa_s, prev_state); | |
801 | return ret; | |
802 | } | |
803 | ||
804 | /* If we have more SSIDs to scan, add a timeout so we scan them too */ | |
805 | if (ssid || !wpa_s->first_sched_scan) { | |
806 | wpa_s->sched_scan_timed_out = 0; | |
807 | eloop_register_timeout(wpa_s->sched_scan_timeout, 0, | |
808 | wpa_supplicant_sched_scan_timeout, | |
809 | wpa_s, NULL); | |
810 | wpa_s->first_sched_scan = 0; | |
811 | wpa_s->sched_scan_timeout /= 2; | |
812 | wpa_s->sched_scan_interval *= 2; | |
813 | } | |
814 | ||
815 | return 0; | |
816 | } | |
817 | ||
818 | ||
6fc6879b JM |
819 | /** |
820 | * wpa_supplicant_cancel_scan - Cancel a scheduled scan request | |
821 | * @wpa_s: Pointer to wpa_supplicant data | |
822 | * | |
823 | * This function is used to cancel a scan request scheduled with | |
824 | * wpa_supplicant_req_scan(). | |
825 | */ | |
826 | void wpa_supplicant_cancel_scan(struct wpa_supplicant *wpa_s) | |
827 | { | |
f049052b | 828 | wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling scan request"); |
6fc6879b JM |
829 | eloop_cancel_timeout(wpa_supplicant_scan, wpa_s, NULL); |
830 | } | |
cb8564b1 DW |
831 | |
832 | ||
cbdf3507 LC |
833 | /** |
834 | * wpa_supplicant_cancel_sched_scan - Stop running scheduled scans | |
835 | * @wpa_s: Pointer to wpa_supplicant data | |
836 | * | |
837 | * This function is used to stop a periodic scheduled scan. | |
838 | */ | |
839 | void wpa_supplicant_cancel_sched_scan(struct wpa_supplicant *wpa_s) | |
840 | { | |
841 | if (!wpa_s->sched_scanning) | |
842 | return; | |
843 | ||
844 | wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling sched scan"); | |
845 | eloop_cancel_timeout(wpa_supplicant_sched_scan_timeout, wpa_s, NULL); | |
846 | wpa_supplicant_stop_sched_scan(wpa_s); | |
847 | } | |
848 | ||
849 | ||
cb8564b1 DW |
850 | void wpa_supplicant_notify_scanning(struct wpa_supplicant *wpa_s, |
851 | int scanning) | |
852 | { | |
853 | if (wpa_s->scanning != scanning) { | |
854 | wpa_s->scanning = scanning; | |
8bac466b | 855 | wpas_notify_scanning(wpa_s); |
cb8564b1 DW |
856 | } |
857 | } | |
858 | ||
9ba9fa07 JM |
859 | |
860 | static int wpa_scan_get_max_rate(const struct wpa_scan_res *res) | |
861 | { | |
862 | int rate = 0; | |
863 | const u8 *ie; | |
864 | int i; | |
865 | ||
866 | ie = wpa_scan_get_ie(res, WLAN_EID_SUPP_RATES); | |
867 | for (i = 0; ie && i < ie[1]; i++) { | |
868 | if ((ie[i + 2] & 0x7f) > rate) | |
869 | rate = ie[i + 2] & 0x7f; | |
870 | } | |
871 | ||
872 | ie = wpa_scan_get_ie(res, WLAN_EID_EXT_SUPP_RATES); | |
873 | for (i = 0; ie && i < ie[1]; i++) { | |
874 | if ((ie[i + 2] & 0x7f) > rate) | |
875 | rate = ie[i + 2] & 0x7f; | |
876 | } | |
877 | ||
878 | return rate; | |
879 | } | |
880 | ||
881 | ||
d1f9c410 JM |
882 | const u8 * wpa_scan_get_ie(const struct wpa_scan_res *res, u8 ie) |
883 | { | |
884 | const u8 *end, *pos; | |
885 | ||
886 | pos = (const u8 *) (res + 1); | |
887 | end = pos + res->ie_len; | |
888 | ||
889 | while (pos + 1 < end) { | |
890 | if (pos + 2 + pos[1] > end) | |
891 | break; | |
892 | if (pos[0] == ie) | |
893 | return pos; | |
894 | pos += 2 + pos[1]; | |
895 | } | |
896 | ||
897 | return NULL; | |
898 | } | |
899 | ||
900 | ||
9ba9fa07 JM |
901 | const u8 * wpa_scan_get_vendor_ie(const struct wpa_scan_res *res, |
902 | u32 vendor_type) | |
903 | { | |
904 | const u8 *end, *pos; | |
905 | ||
906 | pos = (const u8 *) (res + 1); | |
907 | end = pos + res->ie_len; | |
908 | ||
909 | while (pos + 1 < end) { | |
910 | if (pos + 2 + pos[1] > end) | |
911 | break; | |
912 | if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 && | |
913 | vendor_type == WPA_GET_BE32(&pos[2])) | |
914 | return pos; | |
915 | pos += 2 + pos[1]; | |
916 | } | |
917 | ||
918 | return NULL; | |
919 | } | |
920 | ||
921 | ||
922 | struct wpabuf * wpa_scan_get_vendor_ie_multi(const struct wpa_scan_res *res, | |
923 | u32 vendor_type) | |
924 | { | |
925 | struct wpabuf *buf; | |
926 | const u8 *end, *pos; | |
927 | ||
928 | buf = wpabuf_alloc(res->ie_len); | |
929 | if (buf == NULL) | |
930 | return NULL; | |
931 | ||
932 | pos = (const u8 *) (res + 1); | |
933 | end = pos + res->ie_len; | |
934 | ||
54f489be JM |
935 | while (pos + 1 < end) { |
936 | if (pos + 2 + pos[1] > end) | |
937 | break; | |
938 | if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 && | |
939 | vendor_type == WPA_GET_BE32(&pos[2])) | |
940 | wpabuf_put_data(buf, pos + 2 + 4, pos[1] - 4); | |
941 | pos += 2 + pos[1]; | |
942 | } | |
943 | ||
944 | if (wpabuf_len(buf) == 0) { | |
945 | wpabuf_free(buf); | |
946 | buf = NULL; | |
947 | } | |
948 | ||
949 | return buf; | |
950 | } | |
951 | ||
952 | ||
953 | struct wpabuf * wpa_scan_get_vendor_ie_multi_beacon( | |
954 | const struct wpa_scan_res *res, u32 vendor_type) | |
955 | { | |
956 | struct wpabuf *buf; | |
957 | const u8 *end, *pos; | |
958 | ||
959 | if (res->beacon_ie_len == 0) | |
960 | return NULL; | |
961 | buf = wpabuf_alloc(res->beacon_ie_len); | |
962 | if (buf == NULL) | |
963 | return NULL; | |
964 | ||
965 | pos = (const u8 *) (res + 1); | |
966 | pos += res->ie_len; | |
967 | end = pos + res->beacon_ie_len; | |
968 | ||
9ba9fa07 JM |
969 | while (pos + 1 < end) { |
970 | if (pos + 2 + pos[1] > end) | |
971 | break; | |
972 | if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 && | |
973 | vendor_type == WPA_GET_BE32(&pos[2])) | |
974 | wpabuf_put_data(buf, pos + 2 + 4, pos[1] - 4); | |
975 | pos += 2 + pos[1]; | |
976 | } | |
977 | ||
978 | if (wpabuf_len(buf) == 0) { | |
979 | wpabuf_free(buf); | |
980 | buf = NULL; | |
981 | } | |
982 | ||
983 | return buf; | |
984 | } | |
985 | ||
986 | ||
987 | /* Compare function for sorting scan results. Return >0 if @b is considered | |
988 | * better. */ | |
989 | static int wpa_scan_result_compar(const void *a, const void *b) | |
990 | { | |
991 | struct wpa_scan_res **_wa = (void *) a; | |
992 | struct wpa_scan_res **_wb = (void *) b; | |
993 | struct wpa_scan_res *wa = *_wa; | |
994 | struct wpa_scan_res *wb = *_wb; | |
995 | int wpa_a, wpa_b, maxrate_a, maxrate_b; | |
996 | ||
997 | /* WPA/WPA2 support preferred */ | |
998 | wpa_a = wpa_scan_get_vendor_ie(wa, WPA_IE_VENDOR_TYPE) != NULL || | |
999 | wpa_scan_get_ie(wa, WLAN_EID_RSN) != NULL; | |
1000 | wpa_b = wpa_scan_get_vendor_ie(wb, WPA_IE_VENDOR_TYPE) != NULL || | |
1001 | wpa_scan_get_ie(wb, WLAN_EID_RSN) != NULL; | |
1002 | ||
1003 | if (wpa_b && !wpa_a) | |
1004 | return 1; | |
1005 | if (!wpa_b && wpa_a) | |
1006 | return -1; | |
1007 | ||
1008 | /* privacy support preferred */ | |
1009 | if ((wa->caps & IEEE80211_CAP_PRIVACY) == 0 && | |
1010 | (wb->caps & IEEE80211_CAP_PRIVACY)) | |
1011 | return 1; | |
1012 | if ((wa->caps & IEEE80211_CAP_PRIVACY) && | |
1013 | (wb->caps & IEEE80211_CAP_PRIVACY) == 0) | |
1014 | return -1; | |
1015 | ||
1016 | /* best/max rate preferred if signal level close enough XXX */ | |
1017 | if ((wa->level && wb->level && abs(wb->level - wa->level) < 5) || | |
1018 | (wa->qual && wb->qual && abs(wb->qual - wa->qual) < 10)) { | |
1019 | maxrate_a = wpa_scan_get_max_rate(wa); | |
1020 | maxrate_b = wpa_scan_get_max_rate(wb); | |
1021 | if (maxrate_a != maxrate_b) | |
1022 | return maxrate_b - maxrate_a; | |
1023 | } | |
1024 | ||
1025 | /* use freq for channel preference */ | |
1026 | ||
1027 | /* all things being equal, use signal level; if signal levels are | |
1028 | * identical, use quality values since some drivers may only report | |
1029 | * that value and leave the signal level zero */ | |
1030 | if (wb->level == wa->level) | |
1031 | return wb->qual - wa->qual; | |
1032 | return wb->level - wa->level; | |
1033 | } | |
1034 | ||
1035 | ||
41e650ae JM |
1036 | #ifdef CONFIG_WPS |
1037 | /* Compare function for sorting scan results when searching a WPS AP for | |
1038 | * provisioning. Return >0 if @b is considered better. */ | |
1039 | static int wpa_scan_result_wps_compar(const void *a, const void *b) | |
1040 | { | |
1041 | struct wpa_scan_res **_wa = (void *) a; | |
1042 | struct wpa_scan_res **_wb = (void *) b; | |
1043 | struct wpa_scan_res *wa = *_wa; | |
1044 | struct wpa_scan_res *wb = *_wb; | |
1045 | int uses_wps_a, uses_wps_b; | |
1046 | struct wpabuf *wps_a, *wps_b; | |
1047 | int res; | |
1048 | ||
1049 | /* Optimization - check WPS IE existence before allocated memory and | |
1050 | * doing full reassembly. */ | |
1051 | uses_wps_a = wpa_scan_get_vendor_ie(wa, WPS_IE_VENDOR_TYPE) != NULL; | |
1052 | uses_wps_b = wpa_scan_get_vendor_ie(wb, WPS_IE_VENDOR_TYPE) != NULL; | |
1053 | if (uses_wps_a && !uses_wps_b) | |
1054 | return -1; | |
1055 | if (!uses_wps_a && uses_wps_b) | |
1056 | return 1; | |
1057 | ||
1058 | if (uses_wps_a && uses_wps_b) { | |
1059 | wps_a = wpa_scan_get_vendor_ie_multi(wa, WPS_IE_VENDOR_TYPE); | |
1060 | wps_b = wpa_scan_get_vendor_ie_multi(wb, WPS_IE_VENDOR_TYPE); | |
1061 | res = wps_ap_priority_compar(wps_a, wps_b); | |
1062 | wpabuf_free(wps_a); | |
1063 | wpabuf_free(wps_b); | |
1064 | if (res) | |
1065 | return res; | |
1066 | } | |
1067 | ||
1068 | /* | |
1069 | * Do not use current AP security policy as a sorting criteria during | |
1070 | * WPS provisioning step since the AP may get reconfigured at the | |
1071 | * completion of provisioning. | |
1072 | */ | |
1073 | ||
1074 | /* all things being equal, use signal level; if signal levels are | |
1075 | * identical, use quality values since some drivers may only report | |
1076 | * that value and leave the signal level zero */ | |
1077 | if (wb->level == wa->level) | |
1078 | return wb->qual - wa->qual; | |
1079 | return wb->level - wa->level; | |
1080 | } | |
1081 | #endif /* CONFIG_WPS */ | |
1082 | ||
1083 | ||
9ba9fa07 JM |
1084 | /** |
1085 | * wpa_supplicant_get_scan_results - Get scan results | |
1086 | * @wpa_s: Pointer to wpa_supplicant data | |
1087 | * @info: Information about what was scanned or %NULL if not available | |
1088 | * @new_scan: Whether a new scan was performed | |
1089 | * Returns: Scan results, %NULL on failure | |
1090 | * | |
1091 | * This function request the current scan results from the driver and updates | |
1092 | * the local BSS list wpa_s->bss. The caller is responsible for freeing the | |
1093 | * results with wpa_scan_results_free(). | |
1094 | */ | |
1095 | struct wpa_scan_results * | |
1096 | wpa_supplicant_get_scan_results(struct wpa_supplicant *wpa_s, | |
1097 | struct scan_info *info, int new_scan) | |
1098 | { | |
1099 | struct wpa_scan_results *scan_res; | |
1100 | size_t i; | |
41e650ae | 1101 | int (*compar)(const void *, const void *) = wpa_scan_result_compar; |
9ba9fa07 JM |
1102 | |
1103 | if (wpa_s->drv_flags & WPA_DRIVER_FLAGS_USER_SPACE_MLME) | |
1104 | scan_res = ieee80211_sta_get_scan_results(wpa_s); | |
1105 | else | |
1106 | scan_res = wpa_drv_get_scan_results2(wpa_s); | |
1107 | if (scan_res == NULL) { | |
f049052b | 1108 | wpa_dbg(wpa_s, MSG_DEBUG, "Failed to get scan results"); |
9ba9fa07 JM |
1109 | return NULL; |
1110 | } | |
1111 | ||
41e650ae JM |
1112 | #ifdef CONFIG_WPS |
1113 | if (wpas_wps_in_progress(wpa_s)) { | |
f049052b BG |
1114 | wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Order scan results with WPS " |
1115 | "provisioning rules"); | |
41e650ae JM |
1116 | compar = wpa_scan_result_wps_compar; |
1117 | } | |
1118 | #endif /* CONFIG_WPS */ | |
1119 | ||
9ba9fa07 | 1120 | qsort(scan_res->res, scan_res->num, sizeof(struct wpa_scan_res *), |
41e650ae | 1121 | compar); |
9ba9fa07 JM |
1122 | |
1123 | wpa_bss_update_start(wpa_s); | |
1124 | for (i = 0; i < scan_res->num; i++) | |
1125 | wpa_bss_update_scan_res(wpa_s, scan_res->res[i]); | |
1126 | wpa_bss_update_end(wpa_s, info, new_scan); | |
1127 | ||
1128 | return scan_res; | |
1129 | } | |
1130 | ||
1131 | ||
1132 | int wpa_supplicant_update_scan_results(struct wpa_supplicant *wpa_s) | |
1133 | { | |
1134 | struct wpa_scan_results *scan_res; | |
1135 | scan_res = wpa_supplicant_get_scan_results(wpa_s, NULL, 0); | |
1136 | if (scan_res == NULL) | |
1137 | return -1; | |
1138 | wpa_scan_results_free(scan_res); | |
1139 | ||
1140 | return 0; | |
1141 | } |