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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 | 23 | #include "bss.h" |
cbc54848 | 24 | #include "gas_query.h" |
9ba9fa07 | 25 | #include "scan.h" |
6fc6879b JM |
26 | |
27 | ||
28 | static void wpa_supplicant_gen_assoc_event(struct wpa_supplicant *wpa_s) | |
29 | { | |
30 | struct wpa_ssid *ssid; | |
31 | union wpa_event_data data; | |
32 | ||
33 | ssid = wpa_supplicant_get_ssid(wpa_s); | |
34 | if (ssid == NULL) | |
35 | return; | |
36 | ||
8bac466b | 37 | if (wpa_s->current_ssid == NULL) { |
6fc6879b | 38 | wpa_s->current_ssid = ssid; |
8bac466b JM |
39 | if (wpa_s->current_ssid != NULL) |
40 | wpas_notify_network_changed(wpa_s); | |
41 | } | |
6fc6879b | 42 | wpa_supplicant_initiate_eapol(wpa_s); |
f049052b BG |
43 | wpa_dbg(wpa_s, MSG_DEBUG, "Already associated with a configured " |
44 | "network - generating associated event"); | |
6fc6879b JM |
45 | os_memset(&data, 0, sizeof(data)); |
46 | wpa_supplicant_event(wpa_s, EVENT_ASSOC, &data); | |
47 | } | |
48 | ||
49 | ||
ad08c363 | 50 | #ifdef CONFIG_WPS |
5f738a21 | 51 | static int wpas_wps_in_use(struct wpa_supplicant *wpa_s, |
f90c86d4 | 52 | enum wps_request_type *req_type) |
ad08c363 JM |
53 | { |
54 | struct wpa_ssid *ssid; | |
55 | int wps = 0; | |
ad08c363 | 56 | |
5f738a21 | 57 | for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) { |
ad08c363 JM |
58 | if (!(ssid->key_mgmt & WPA_KEY_MGMT_WPS)) |
59 | continue; | |
60 | ||
61 | wps = 1; | |
b01c18a8 | 62 | *req_type = wpas_wps_get_req_type(ssid); |
ad08c363 JM |
63 | if (!ssid->eap.phase1) |
64 | continue; | |
65 | ||
ad08c363 JM |
66 | if (os_strstr(ssid->eap.phase1, "pbc=1")) |
67 | return 2; | |
68 | } | |
69 | ||
5f738a21 | 70 | #ifdef CONFIG_P2P |
7a808c7e JM |
71 | if (!wpa_s->global->p2p_disabled && wpa_s->global->p2p && |
72 | !wpa_s->conf->p2p_disabled) { | |
b21ff9cb JM |
73 | wpa_s->wps->dev.p2p = 1; |
74 | if (!wps) { | |
75 | wps = 1; | |
76 | *req_type = WPS_REQ_ENROLLEE_INFO; | |
77 | } | |
5f738a21 LC |
78 | } |
79 | #endif /* CONFIG_P2P */ | |
80 | ||
ad08c363 JM |
81 | return wps; |
82 | } | |
83 | #endif /* CONFIG_WPS */ | |
84 | ||
e76baaac | 85 | |
2c09af30 JM |
86 | /** |
87 | * wpa_supplicant_enabled_networks - Check whether there are enabled networks | |
88 | * @wpa_s: Pointer to wpa_supplicant data | |
89 | * Returns: 0 if no networks are enabled, >0 if networks are enabled | |
90 | * | |
91 | * This function is used to figure out whether any networks (or Interworking | |
92 | * with enabled credentials and auto_interworking) are present in the current | |
93 | * configuration. | |
94 | */ | |
349493bd | 95 | int wpa_supplicant_enabled_networks(struct wpa_supplicant *wpa_s) |
e76baaac | 96 | { |
349493bd | 97 | struct wpa_ssid *ssid = wpa_s->conf->ssid; |
d4534bde | 98 | int count = 0, disabled = 0; |
e76baaac | 99 | while (ssid) { |
349493bd | 100 | if (!wpas_network_disabled(wpa_s, ssid)) |
5471c343 | 101 | count++; |
d4534bde JM |
102 | else |
103 | disabled++; | |
e76baaac JM |
104 | ssid = ssid->next; |
105 | } | |
4d5bda5f JM |
106 | if (wpa_s->conf->cred && wpa_s->conf->interworking && |
107 | wpa_s->conf->auto_interworking) | |
108 | count++; | |
d4534bde JM |
109 | if (count == 0 && disabled > 0) { |
110 | wpa_dbg(wpa_s, MSG_DEBUG, "No enabled networks (%d disabled " | |
111 | "networks)", disabled); | |
112 | } | |
5471c343 | 113 | return count; |
e76baaac JM |
114 | } |
115 | ||
116 | ||
117 | static void wpa_supplicant_assoc_try(struct wpa_supplicant *wpa_s, | |
118 | struct wpa_ssid *ssid) | |
119 | { | |
120 | while (ssid) { | |
349493bd | 121 | if (!wpas_network_disabled(wpa_s, ssid)) |
e76baaac JM |
122 | break; |
123 | ssid = ssid->next; | |
124 | } | |
125 | ||
126 | /* ap_scan=2 mode - try to associate with each SSID. */ | |
127 | if (ssid == NULL) { | |
f049052b BG |
128 | wpa_dbg(wpa_s, MSG_DEBUG, "wpa_supplicant_assoc_try: Reached " |
129 | "end of scan list - go back to beginning"); | |
ba2a573c | 130 | wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN; |
e76baaac JM |
131 | wpa_supplicant_req_scan(wpa_s, 0, 0); |
132 | return; | |
133 | } | |
134 | if (ssid->next) { | |
135 | /* Continue from the next SSID on the next attempt. */ | |
136 | wpa_s->prev_scan_ssid = ssid; | |
137 | } else { | |
138 | /* Start from the beginning of the SSID list. */ | |
ba2a573c | 139 | wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN; |
e76baaac JM |
140 | } |
141 | wpa_supplicant_associate(wpa_s, NULL, ssid); | |
142 | } | |
143 | ||
144 | ||
d3a98225 JM |
145 | static int int_array_len(const int *a) |
146 | { | |
147 | int i; | |
148 | for (i = 0; a && a[i]; i++) | |
149 | ; | |
150 | return i; | |
151 | } | |
152 | ||
153 | ||
154 | static void int_array_concat(int **res, const int *a) | |
155 | { | |
156 | int reslen, alen, i; | |
157 | int *n; | |
158 | ||
159 | reslen = int_array_len(*res); | |
160 | alen = int_array_len(a); | |
161 | ||
067ffa26 | 162 | n = os_realloc_array(*res, reslen + alen + 1, sizeof(int)); |
d3a98225 JM |
163 | if (n == NULL) { |
164 | os_free(*res); | |
165 | *res = NULL; | |
e6c0ebff | 166 | return; |
d3a98225 JM |
167 | } |
168 | for (i = 0; i <= alen; i++) | |
169 | n[reslen + i] = a[i]; | |
170 | *res = n; | |
171 | } | |
172 | ||
173 | ||
174 | static int freq_cmp(const void *a, const void *b) | |
175 | { | |
176 | int _a = *(int *) a; | |
177 | int _b = *(int *) b; | |
178 | ||
179 | if (_a == 0) | |
180 | return 1; | |
181 | if (_b == 0) | |
182 | return -1; | |
183 | return _a - _b; | |
184 | } | |
185 | ||
186 | ||
187 | static void int_array_sort_unique(int *a) | |
188 | { | |
189 | int alen; | |
190 | int i, j; | |
191 | ||
192 | if (a == NULL) | |
193 | return; | |
194 | ||
195 | alen = int_array_len(a); | |
196 | qsort(a, alen, sizeof(int), freq_cmp); | |
197 | ||
198 | i = 0; | |
199 | j = 1; | |
200 | while (a[i] && a[j]) { | |
201 | if (a[i] == a[j]) { | |
202 | j++; | |
203 | continue; | |
204 | } | |
205 | a[++i] = a[j++]; | |
206 | } | |
207 | if (a[i]) | |
208 | i++; | |
209 | a[i] = 0; | |
210 | } | |
211 | ||
212 | ||
2c09af30 JM |
213 | /** |
214 | * wpa_supplicant_trigger_scan - Request driver to start a scan | |
215 | * @wpa_s: Pointer to wpa_supplicant data | |
216 | * @params: Scan parameters | |
217 | * Returns: 0 on success, -1 on failure | |
218 | */ | |
60b94c98 JM |
219 | int wpa_supplicant_trigger_scan(struct wpa_supplicant *wpa_s, |
220 | struct wpa_driver_scan_params *params) | |
221 | { | |
222 | int ret; | |
223 | ||
224 | wpa_supplicant_notify_scanning(wpa_s, 1); | |
225 | ||
17fbb751 | 226 | ret = wpa_drv_scan(wpa_s, params); |
60b94c98 JM |
227 | if (ret) { |
228 | wpa_supplicant_notify_scanning(wpa_s, 0); | |
229 | wpas_notify_scan_done(wpa_s, 0); | |
0b7a25c0 | 230 | } else { |
4342326f | 231 | os_get_time(&wpa_s->scan_trigger_time); |
60b94c98 | 232 | wpa_s->scan_runs++; |
0b7a25c0 JM |
233 | wpa_s->normal_scans++; |
234 | } | |
60b94c98 JM |
235 | |
236 | return ret; | |
237 | } | |
238 | ||
239 | ||
6a90053c LC |
240 | static void |
241 | wpa_supplicant_delayed_sched_scan_timeout(void *eloop_ctx, void *timeout_ctx) | |
242 | { | |
243 | struct wpa_supplicant *wpa_s = eloop_ctx; | |
244 | ||
245 | wpa_dbg(wpa_s, MSG_DEBUG, "Starting delayed sched scan"); | |
246 | ||
247 | if (wpa_supplicant_req_sched_scan(wpa_s)) | |
248 | wpa_supplicant_req_scan(wpa_s, 0, 0); | |
249 | } | |
250 | ||
251 | ||
cbdf3507 LC |
252 | static void |
253 | wpa_supplicant_sched_scan_timeout(void *eloop_ctx, void *timeout_ctx) | |
254 | { | |
255 | struct wpa_supplicant *wpa_s = eloop_ctx; | |
256 | ||
257 | wpa_dbg(wpa_s, MSG_DEBUG, "Sched scan timeout - stopping it"); | |
258 | ||
259 | wpa_s->sched_scan_timed_out = 1; | |
260 | wpa_supplicant_cancel_sched_scan(wpa_s); | |
261 | } | |
262 | ||
263 | ||
f86d282f JJ |
264 | int wpa_supplicant_start_sched_scan(struct wpa_supplicant *wpa_s, |
265 | struct wpa_driver_scan_params *params, | |
266 | int interval) | |
cbdf3507 LC |
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 | ||
f86d282f | 281 | int wpa_supplicant_stop_sched_scan(struct wpa_supplicant *wpa_s) |
cbdf3507 LC |
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 | 485 | |
5cc70322 | 486 | |
faf9a858 JM |
487 | static struct hostapd_hw_modes * get_mode(struct hostapd_hw_modes *modes, |
488 | u16 num_modes, | |
489 | enum hostapd_hw_mode mode) | |
490 | { | |
491 | u16 i; | |
492 | ||
493 | for (i = 0; i < num_modes; i++) { | |
494 | if (modes[i].mode == mode) | |
495 | return &modes[i]; | |
496 | } | |
497 | ||
498 | return NULL; | |
499 | } | |
500 | ||
501 | ||
502 | static void wpa_setband_scan_freqs_list(struct wpa_supplicant *wpa_s, | |
503 | enum hostapd_hw_mode band, | |
504 | struct wpa_driver_scan_params *params) | |
505 | { | |
506 | /* Include only supported channels for the specified band */ | |
507 | struct hostapd_hw_modes *mode; | |
508 | int count, i; | |
509 | ||
510 | mode = get_mode(wpa_s->hw.modes, wpa_s->hw.num_modes, band); | |
511 | if (mode == NULL) { | |
512 | /* No channels supported in this band - use empty list */ | |
513 | params->freqs = os_zalloc(sizeof(int)); | |
514 | return; | |
515 | } | |
516 | ||
517 | params->freqs = os_zalloc((mode->num_channels + 1) * sizeof(int)); | |
518 | if (params->freqs == NULL) | |
519 | return; | |
520 | for (count = 0, i = 0; i < mode->num_channels; i++) { | |
521 | if (mode->channels[i].flag & HOSTAPD_CHAN_DISABLED) | |
522 | continue; | |
523 | params->freqs[count++] = mode->channels[i].freq; | |
524 | } | |
525 | } | |
526 | ||
527 | ||
528 | static void wpa_setband_scan_freqs(struct wpa_supplicant *wpa_s, | |
529 | struct wpa_driver_scan_params *params) | |
530 | { | |
531 | if (wpa_s->hw.modes == NULL) | |
532 | return; /* unknown what channels the driver supports */ | |
533 | if (params->freqs) | |
534 | return; /* already using a limited channel set */ | |
535 | if (wpa_s->setband == WPA_SETBAND_5G) | |
536 | wpa_setband_scan_freqs_list(wpa_s, HOSTAPD_MODE_IEEE80211A, | |
537 | params); | |
538 | else if (wpa_s->setband == WPA_SETBAND_2G) | |
539 | wpa_setband_scan_freqs_list(wpa_s, HOSTAPD_MODE_IEEE80211G, | |
540 | params); | |
541 | } | |
542 | ||
543 | ||
5f738a21 LC |
544 | static void wpa_supplicant_scan(void *eloop_ctx, void *timeout_ctx) |
545 | { | |
546 | struct wpa_supplicant *wpa_s = eloop_ctx; | |
547 | struct wpa_ssid *ssid; | |
4115303b | 548 | int ret; |
b9b12d02 | 549 | struct wpabuf *extra_ie = NULL; |
e76baaac | 550 | struct wpa_driver_scan_params params; |
7c865c68 | 551 | struct wpa_driver_scan_params *scan_params; |
e76baaac | 552 | size_t max_ssids; |
207ef3fb | 553 | enum wpa_states prev_state; |
6fc6879b | 554 | |
8401a6b0 | 555 | if (wpa_s->wpa_state == WPA_INTERFACE_DISABLED) { |
f049052b | 556 | wpa_dbg(wpa_s, MSG_DEBUG, "Skip scan - interface disabled"); |
b1cd021e | 557 | wpas_p2p_continue_after_scan(wpa_s); |
8401a6b0 JM |
558 | return; |
559 | } | |
560 | ||
4115303b | 561 | if (wpa_s->disconnected && wpa_s->scan_req == NORMAL_SCAN_REQ) { |
ac06fb12 | 562 | wpa_dbg(wpa_s, MSG_DEBUG, "Disconnected - do not scan"); |
3180d7a2 | 563 | wpa_supplicant_set_state(wpa_s, WPA_DISCONNECTED); |
b1cd021e | 564 | wpas_p2p_continue_after_scan(wpa_s); |
6fc6879b | 565 | return; |
3180d7a2 | 566 | } |
6fc6879b | 567 | |
f86d282f JJ |
568 | if (wpa_s->scanning) { |
569 | /* | |
570 | * If we are already in scanning state, we shall reschedule the | |
571 | * the incoming scan request. | |
572 | */ | |
573 | wpa_dbg(wpa_s, MSG_DEBUG, "Already scanning - Reschedule the incoming scan req"); | |
574 | wpa_supplicant_req_scan(wpa_s, 1, 0); | |
575 | return; | |
576 | } | |
577 | ||
349493bd | 578 | if (!wpa_supplicant_enabled_networks(wpa_s) && |
4115303b | 579 | wpa_s->scan_req == NORMAL_SCAN_REQ) { |
f049052b | 580 | wpa_dbg(wpa_s, MSG_DEBUG, "No enabled networks - do not scan"); |
6fc6879b | 581 | wpa_supplicant_set_state(wpa_s, WPA_INACTIVE); |
b1cd021e | 582 | wpas_p2p_continue_after_scan(wpa_s); |
6fc6879b JM |
583 | return; |
584 | } | |
6fc6879b | 585 | |
c2a04078 JM |
586 | if (wpa_s->conf->ap_scan != 0 && |
587 | (wpa_s->drv_flags & WPA_DRIVER_FLAGS_WIRED)) { | |
f049052b BG |
588 | wpa_dbg(wpa_s, MSG_DEBUG, "Using wired authentication - " |
589 | "overriding ap_scan configuration"); | |
6fc6879b | 590 | wpa_s->conf->ap_scan = 0; |
8bac466b | 591 | wpas_notify_ap_scan_changed(wpa_s); |
6fc6879b JM |
592 | } |
593 | ||
594 | if (wpa_s->conf->ap_scan == 0) { | |
595 | wpa_supplicant_gen_assoc_event(wpa_s); | |
596 | return; | |
597 | } | |
598 | ||
303f60d3 | 599 | #ifdef CONFIG_P2P |
c3775143 | 600 | if (wpas_p2p_in_progress(wpa_s) || wpas_wpa_is_in_progress(wpa_s, 0)) { |
99fcd404 JM |
601 | if (wpa_s->sta_scan_pending && |
602 | wpas_p2p_in_progress(wpa_s) == 2 && | |
e665ca9a | 603 | wpa_s->global->p2p_cb_on_scan_complete) { |
99fcd404 JM |
604 | wpa_dbg(wpa_s, MSG_DEBUG, "Process pending station " |
605 | "mode scan during P2P search"); | |
606 | } else { | |
303f60d3 JM |
607 | wpa_dbg(wpa_s, MSG_DEBUG, "Delay station mode scan " |
608 | "while P2P operation is in progress"); | |
99fcd404 | 609 | wpa_s->sta_scan_pending = 1; |
303f60d3 | 610 | wpa_supplicant_req_scan(wpa_s, 5, 0); |
99fcd404 | 611 | return; |
303f60d3 | 612 | } |
303f60d3 JM |
613 | } |
614 | #endif /* CONFIG_P2P */ | |
615 | ||
cbc54848 JM |
616 | #ifdef CONFIG_GAS |
617 | if (gas_query_in_progress(wpa_s->gas)) { | |
618 | wpa_dbg(wpa_s, MSG_DEBUG, "Delay scan while GAS query is in progress"); | |
619 | wpa_supplicant_req_scan(wpa_s, 1, 0); | |
620 | return; | |
621 | } | |
622 | #endif /* CONFIG_GAS */ | |
623 | ||
17fbb751 | 624 | if (wpa_s->conf->ap_scan == 2) |
e76baaac JM |
625 | max_ssids = 1; |
626 | else { | |
627 | max_ssids = wpa_s->max_scan_ssids; | |
628 | if (max_ssids > WPAS_MAX_SCAN_SSIDS) | |
629 | max_ssids = WPAS_MAX_SCAN_SSIDS; | |
630 | } | |
631 | ||
12455031 | 632 | wpa_s->last_scan_req = wpa_s->scan_req; |
4115303b | 633 | wpa_s->scan_req = NORMAL_SCAN_REQ; |
e76baaac JM |
634 | |
635 | os_memset(¶ms, 0, sizeof(params)); | |
636 | ||
207ef3fb | 637 | prev_state = wpa_s->wpa_state; |
6fc6879b JM |
638 | if (wpa_s->wpa_state == WPA_DISCONNECTED || |
639 | wpa_s->wpa_state == WPA_INACTIVE) | |
640 | wpa_supplicant_set_state(wpa_s, WPA_SCANNING); | |
641 | ||
7c865c68 TB |
642 | /* |
643 | * If autoscan has set its own scanning parameters | |
644 | */ | |
645 | if (wpa_s->autoscan_params != NULL) { | |
646 | scan_params = wpa_s->autoscan_params; | |
647 | goto scan; | |
648 | } | |
649 | ||
12455031 LP |
650 | if (wpa_s->last_scan_req != MANUAL_SCAN_REQ && |
651 | wpa_s->connect_without_scan) { | |
7dcdcfd6 JM |
652 | for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) { |
653 | if (ssid == wpa_s->connect_without_scan) | |
654 | break; | |
655 | } | |
656 | wpa_s->connect_without_scan = NULL; | |
657 | if (ssid) { | |
658 | wpa_printf(MSG_DEBUG, "Start a pre-selected network " | |
659 | "without scan step"); | |
660 | wpa_supplicant_associate(wpa_s, NULL, ssid); | |
661 | return; | |
662 | } | |
663 | } | |
664 | ||
a21c05db | 665 | #ifdef CONFIG_P2P |
85ea132a JM |
666 | if ((wpa_s->p2p_in_provisioning || wpa_s->show_group_started) && |
667 | wpa_s->go_params) { | |
9100b660 JM |
668 | wpa_printf(MSG_DEBUG, "P2P: Use specific SSID for scan during P2P group formation (p2p_in_provisioning=%d show_group_started=%d)", |
669 | wpa_s->p2p_in_provisioning, | |
670 | wpa_s->show_group_started); | |
a21c05db JM |
671 | params.ssids[0].ssid = wpa_s->go_params->ssid; |
672 | params.ssids[0].ssid_len = wpa_s->go_params->ssid_len; | |
673 | params.num_ssids = 1; | |
674 | goto ssid_list_set; | |
675 | } | |
676 | #endif /* CONFIG_P2P */ | |
677 | ||
e76baaac | 678 | /* Find the starting point from which to continue scanning */ |
6fc6879b | 679 | ssid = wpa_s->conf->ssid; |
ba2a573c | 680 | if (wpa_s->prev_scan_ssid != WILDCARD_SSID_SCAN) { |
6fc6879b JM |
681 | while (ssid) { |
682 | if (ssid == wpa_s->prev_scan_ssid) { | |
683 | ssid = ssid->next; | |
684 | break; | |
685 | } | |
686 | ssid = ssid->next; | |
687 | } | |
688 | } | |
6fc6879b | 689 | |
12455031 LP |
690 | if (wpa_s->last_scan_req != MANUAL_SCAN_REQ && |
691 | wpa_s->conf->ap_scan == 2) { | |
7dcdcfd6 | 692 | wpa_s->connect_without_scan = NULL; |
b3aa456b | 693 | wpa_s->prev_scan_wildcard = 0; |
e76baaac JM |
694 | wpa_supplicant_assoc_try(wpa_s, ssid); |
695 | return; | |
696 | } else if (wpa_s->conf->ap_scan == 2) { | |
6fc6879b | 697 | /* |
ba2a573c JM |
698 | * User-initiated scan request in ap_scan == 2; scan with |
699 | * wildcard SSID. | |
6fc6879b | 700 | */ |
e76baaac JM |
701 | ssid = NULL; |
702 | } else { | |
5be45e2e | 703 | struct wpa_ssid *start = ssid, *tssid; |
d3a98225 | 704 | int freqs_set = 0; |
e76baaac JM |
705 | if (ssid == NULL && max_ssids > 1) |
706 | ssid = wpa_s->conf->ssid; | |
707 | while (ssid) { | |
349493bd JM |
708 | if (!wpas_network_disabled(wpa_s, ssid) && |
709 | ssid->scan_ssid) { | |
e76baaac JM |
710 | wpa_hexdump_ascii(MSG_DEBUG, "Scan SSID", |
711 | ssid->ssid, ssid->ssid_len); | |
712 | params.ssids[params.num_ssids].ssid = | |
713 | ssid->ssid; | |
714 | params.ssids[params.num_ssids].ssid_len = | |
715 | ssid->ssid_len; | |
716 | params.num_ssids++; | |
717 | if (params.num_ssids + 1 >= max_ssids) | |
718 | break; | |
719 | } | |
720 | ssid = ssid->next; | |
721 | if (ssid == start) | |
722 | break; | |
723 | if (ssid == NULL && max_ssids > 1 && | |
724 | start != wpa_s->conf->ssid) | |
725 | ssid = wpa_s->conf->ssid; | |
6fc6879b | 726 | } |
d3a98225 | 727 | |
5be45e2e | 728 | for (tssid = wpa_s->conf->ssid; tssid; tssid = tssid->next) { |
349493bd | 729 | if (wpas_network_disabled(wpa_s, tssid)) |
d3a98225 | 730 | continue; |
5be45e2e | 731 | if ((params.freqs || !freqs_set) && tssid->scan_freq) { |
d3a98225 | 732 | int_array_concat(¶ms.freqs, |
5be45e2e | 733 | tssid->scan_freq); |
d3a98225 JM |
734 | } else { |
735 | os_free(params.freqs); | |
736 | params.freqs = NULL; | |
737 | } | |
738 | freqs_set = 1; | |
739 | } | |
740 | int_array_sort_unique(params.freqs); | |
6fc6879b JM |
741 | } |
742 | ||
b3aa456b ES |
743 | if (ssid && max_ssids == 1) { |
744 | /* | |
745 | * If the driver is limited to 1 SSID at a time interleave | |
746 | * wildcard SSID scans with specific SSID scans to avoid | |
747 | * waiting a long time for a wildcard scan. | |
748 | */ | |
749 | if (!wpa_s->prev_scan_wildcard) { | |
750 | params.ssids[0].ssid = NULL; | |
751 | params.ssids[0].ssid_len = 0; | |
752 | wpa_s->prev_scan_wildcard = 1; | |
753 | wpa_dbg(wpa_s, MSG_DEBUG, "Starting AP scan for " | |
754 | "wildcard SSID (Interleave with specific)"); | |
755 | } else { | |
756 | wpa_s->prev_scan_ssid = ssid; | |
757 | wpa_s->prev_scan_wildcard = 0; | |
758 | wpa_dbg(wpa_s, MSG_DEBUG, | |
759 | "Starting AP scan for specific SSID: %s", | |
760 | wpa_ssid_txt(ssid->ssid, ssid->ssid_len)); | |
e76baaac | 761 | } |
b3aa456b ES |
762 | } else if (ssid) { |
763 | /* max_ssids > 1 */ | |
764 | ||
765 | wpa_s->prev_scan_ssid = ssid; | |
766 | wpa_dbg(wpa_s, MSG_DEBUG, "Include wildcard SSID in " | |
767 | "the scan request"); | |
768 | params.num_ssids++; | |
e76baaac | 769 | } else { |
ba2a573c | 770 | wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN; |
e76baaac | 771 | params.num_ssids++; |
f049052b BG |
772 | wpa_dbg(wpa_s, MSG_DEBUG, "Starting AP scan for wildcard " |
773 | "SSID"); | |
6fc6879b | 774 | } |
a21c05db JM |
775 | #ifdef CONFIG_P2P |
776 | ssid_list_set: | |
777 | #endif /* CONFIG_P2P */ | |
6fc6879b | 778 | |
5f738a21 | 779 | wpa_supplicant_optimize_freqs(wpa_s, ¶ms); |
a13e07ec | 780 | extra_ie = wpa_supplicant_extra_ies(wpa_s); |
0e65037c | 781 | |
f47d639d | 782 | if (params.freqs == NULL && wpa_s->next_scan_freqs) { |
f049052b BG |
783 | wpa_dbg(wpa_s, MSG_DEBUG, "Optimize scan based on previously " |
784 | "generated frequency list"); | |
f47d639d JM |
785 | params.freqs = wpa_s->next_scan_freqs; |
786 | } else | |
787 | os_free(wpa_s->next_scan_freqs); | |
788 | wpa_s->next_scan_freqs = NULL; | |
faf9a858 | 789 | wpa_setband_scan_freqs(wpa_s, ¶ms); |
f47d639d | 790 | |
f5ffc348 BG |
791 | /* See if user specified frequencies. If so, scan only those. */ |
792 | if (wpa_s->conf->freq_list && !params.freqs) { | |
793 | wpa_dbg(wpa_s, MSG_DEBUG, | |
794 | "Optimize scan based on conf->freq_list"); | |
795 | int_array_concat(¶ms.freqs, wpa_s->conf->freq_list); | |
796 | } | |
797 | ||
6124e858 BG |
798 | /* Use current associated channel? */ |
799 | if (wpa_s->conf->scan_cur_freq && !params.freqs) { | |
53c5dfc2 IP |
800 | unsigned int num = wpa_s->num_multichan_concurrent; |
801 | ||
802 | params.freqs = os_calloc(num + 1, sizeof(int)); | |
803 | if (params.freqs) { | |
804 | num = get_shared_radio_freqs(wpa_s, params.freqs, num); | |
805 | if (num > 0) { | |
806 | wpa_dbg(wpa_s, MSG_DEBUG, "Scan only the " | |
807 | "current operating channels since " | |
808 | "scan_cur_freq is enabled"); | |
809 | } else { | |
810 | os_free(params.freqs); | |
811 | params.freqs = NULL; | |
812 | } | |
6124e858 BG |
813 | } |
814 | } | |
815 | ||
3812464c JM |
816 | params.filter_ssids = wpa_supplicant_build_filter_ssids( |
817 | wpa_s->conf, ¶ms.num_filter_ssids); | |
46ee0427 JM |
818 | if (extra_ie) { |
819 | params.extra_ies = wpabuf_head(extra_ie); | |
820 | params.extra_ies_len = wpabuf_len(extra_ie); | |
821 | } | |
3812464c | 822 | |
d1dd48e3 | 823 | #ifdef CONFIG_P2P |
85ea132a JM |
824 | if (wpa_s->p2p_in_provisioning || |
825 | (wpa_s->show_group_started && wpa_s->go_params)) { | |
d1dd48e3 JM |
826 | /* |
827 | * The interface may not yet be in P2P mode, so we have to | |
828 | * explicitly request P2P probe to disable CCK rates. | |
829 | */ | |
830 | params.p2p_probe = 1; | |
831 | } | |
832 | #endif /* CONFIG_P2P */ | |
833 | ||
7c865c68 TB |
834 | scan_params = ¶ms; |
835 | ||
836 | scan: | |
5cc70322 JM |
837 | #ifdef CONFIG_P2P |
838 | /* | |
839 | * If the driver does not support multi-channel concurrency and a | |
840 | * virtual interface that shares the same radio with the wpa_s interface | |
841 | * is operating there may not be need to scan other channels apart from | |
842 | * the current operating channel on the other virtual interface. Filter | |
843 | * out other channels in case we are trying to find a connection for a | |
844 | * station interface when we are not configured to prefer station | |
845 | * connection and a concurrent operation is already in process. | |
846 | */ | |
12455031 LP |
847 | if (wpa_s->scan_for_connection && |
848 | wpa_s->last_scan_req == NORMAL_SCAN_REQ && | |
5cc70322 JM |
849 | !scan_params->freqs && !params.freqs && |
850 | wpas_is_p2p_prioritized(wpa_s) && | |
5cc70322 JM |
851 | wpa_s->p2p_group_interface == NOT_P2P_GROUP_INTERFACE && |
852 | non_p2p_network_enabled(wpa_s)) { | |
53c5dfc2 IP |
853 | unsigned int num = wpa_s->num_multichan_concurrent; |
854 | ||
855 | params.freqs = os_calloc(num + 1, sizeof(int)); | |
856 | if (params.freqs) { | |
857 | num = get_shared_radio_freqs(wpa_s, params.freqs, num); | |
858 | if (num > 0 && num == wpa_s->num_multichan_concurrent) { | |
859 | wpa_dbg(wpa_s, MSG_DEBUG, "Scan only the current operating channels since all channels are already used"); | |
860 | } else { | |
861 | os_free(params.freqs); | |
862 | params.freqs = NULL; | |
863 | } | |
5cc70322 JM |
864 | } |
865 | } | |
866 | #endif /* CONFIG_P2P */ | |
867 | ||
7c865c68 | 868 | ret = wpa_supplicant_trigger_scan(wpa_s, scan_params); |
6fc6879b | 869 | |
46ee0427 | 870 | wpabuf_free(extra_ie); |
d3a98225 | 871 | os_free(params.freqs); |
3812464c | 872 | os_free(params.filter_ssids); |
ad08c363 | 873 | |
6fc6879b | 874 | if (ret) { |
f049052b | 875 | wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate AP scan"); |
207ef3fb JM |
876 | if (prev_state != wpa_s->wpa_state) |
877 | wpa_supplicant_set_state(wpa_s, prev_state); | |
23270cd8 | 878 | /* Restore scan_req since we will try to scan again */ |
12455031 | 879 | wpa_s->scan_req = wpa_s->last_scan_req; |
1c4c9c50 | 880 | wpa_supplicant_req_scan(wpa_s, 1, 0); |
5cc70322 JM |
881 | } else { |
882 | wpa_s->scan_for_connection = 0; | |
d902a9c1 | 883 | } |
6fc6879b JM |
884 | } |
885 | ||
886 | ||
9e737f08 PF |
887 | void wpa_supplicant_update_scan_int(struct wpa_supplicant *wpa_s, int sec) |
888 | { | |
594516b4 | 889 | struct os_reltime remaining, new_int; |
9e737f08 PF |
890 | int cancelled; |
891 | ||
892 | cancelled = eloop_cancel_timeout_one(wpa_supplicant_scan, wpa_s, NULL, | |
893 | &remaining); | |
894 | ||
895 | new_int.sec = sec; | |
896 | new_int.usec = 0; | |
594516b4 | 897 | if (cancelled && os_reltime_before(&remaining, &new_int)) { |
9e737f08 PF |
898 | new_int.sec = remaining.sec; |
899 | new_int.usec = remaining.usec; | |
900 | } | |
901 | ||
c6f5dec9 PF |
902 | if (cancelled) { |
903 | eloop_register_timeout(new_int.sec, new_int.usec, | |
904 | wpa_supplicant_scan, wpa_s, NULL); | |
905 | } | |
9e737f08 PF |
906 | wpa_s->scan_interval = sec; |
907 | } | |
908 | ||
909 | ||
6fc6879b JM |
910 | /** |
911 | * wpa_supplicant_req_scan - Schedule a scan for neighboring access points | |
912 | * @wpa_s: Pointer to wpa_supplicant data | |
913 | * @sec: Number of seconds after which to scan | |
914 | * @usec: Number of microseconds after which to scan | |
915 | * | |
916 | * This function is used to schedule a scan for neighboring access points after | |
917 | * the specified time. | |
918 | */ | |
919 | void wpa_supplicant_req_scan(struct wpa_supplicant *wpa_s, int sec, int usec) | |
920 | { | |
e2f5a988 DS |
921 | if (eloop_deplete_timeout(sec, usec, wpa_supplicant_scan, wpa_s, NULL)) |
922 | { | |
923 | wpa_dbg(wpa_s, MSG_DEBUG, "Rescheduling scan request: %d sec %d usec", | |
924 | sec, usec); | |
925 | return; | |
926 | } | |
927 | ||
f049052b | 928 | wpa_dbg(wpa_s, MSG_DEBUG, "Setting scan request: %d sec %d usec", |
6fc6879b JM |
929 | sec, usec); |
930 | eloop_cancel_timeout(wpa_supplicant_scan, wpa_s, NULL); | |
931 | eloop_register_timeout(sec, usec, wpa_supplicant_scan, wpa_s, NULL); | |
932 | } | |
933 | ||
934 | ||
6a90053c LC |
935 | /** |
936 | * wpa_supplicant_delayed_sched_scan - Request a delayed scheduled scan | |
937 | * @wpa_s: Pointer to wpa_supplicant data | |
938 | * @sec: Number of seconds after which to scan | |
939 | * @usec: Number of microseconds after which to scan | |
2c09af30 | 940 | * Returns: 0 on success or -1 otherwise |
6a90053c LC |
941 | * |
942 | * This function is used to schedule periodic scans for neighboring | |
943 | * access points after the specified time. | |
944 | */ | |
945 | int wpa_supplicant_delayed_sched_scan(struct wpa_supplicant *wpa_s, | |
946 | int sec, int usec) | |
947 | { | |
948 | if (!wpa_s->sched_scan_supported) | |
949 | return -1; | |
950 | ||
951 | eloop_register_timeout(sec, usec, | |
952 | wpa_supplicant_delayed_sched_scan_timeout, | |
953 | wpa_s, NULL); | |
954 | ||
955 | return 0; | |
956 | } | |
957 | ||
958 | ||
cbdf3507 LC |
959 | /** |
960 | * wpa_supplicant_req_sched_scan - Start a periodic scheduled scan | |
961 | * @wpa_s: Pointer to wpa_supplicant data | |
2c09af30 | 962 | * Returns: 0 is sched_scan was started or -1 otherwise |
cbdf3507 LC |
963 | * |
964 | * This function is used to schedule periodic scans for neighboring | |
965 | * access points repeating the scan continuously. | |
966 | */ | |
967 | int wpa_supplicant_req_sched_scan(struct wpa_supplicant *wpa_s) | |
968 | { | |
969 | struct wpa_driver_scan_params params; | |
7c865c68 | 970 | struct wpa_driver_scan_params *scan_params; |
cbdf3507 | 971 | enum wpa_states prev_state; |
7c865c68 | 972 | struct wpa_ssid *ssid = NULL; |
a13e07ec | 973 | struct wpabuf *extra_ie = NULL; |
cbdf3507 | 974 | int ret; |
cbdf3507 | 975 | unsigned int max_sched_scan_ssids; |
76a5249e | 976 | int wildcard = 0; |
0b7a25c0 | 977 | int need_ssids; |
cbdf3507 LC |
978 | |
979 | if (!wpa_s->sched_scan_supported) | |
980 | return -1; | |
981 | ||
982 | if (wpa_s->max_sched_scan_ssids > WPAS_MAX_SCAN_SSIDS) | |
983 | max_sched_scan_ssids = WPAS_MAX_SCAN_SSIDS; | |
984 | else | |
985 | max_sched_scan_ssids = wpa_s->max_sched_scan_ssids; | |
54ddd743 | 986 | if (max_sched_scan_ssids < 1 || wpa_s->conf->disable_scan_offload) |
76a5249e | 987 | return -1; |
cbdf3507 | 988 | |
1966e3d1 ES |
989 | if (wpa_s->sched_scanning) { |
990 | wpa_dbg(wpa_s, MSG_DEBUG, "Already sched scanning"); | |
cbdf3507 | 991 | return 0; |
1966e3d1 | 992 | } |
cbdf3507 | 993 | |
0b7a25c0 JM |
994 | need_ssids = 0; |
995 | for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) { | |
349493bd | 996 | if (!wpas_network_disabled(wpa_s, ssid) && !ssid->scan_ssid) { |
0b7a25c0 JM |
997 | /* Use wildcard SSID to find this network */ |
998 | wildcard = 1; | |
349493bd JM |
999 | } else if (!wpas_network_disabled(wpa_s, ssid) && |
1000 | ssid->ssid_len) | |
0b7a25c0 | 1001 | need_ssids++; |
aa283ddd JM |
1002 | |
1003 | #ifdef CONFIG_WPS | |
349493bd | 1004 | if (!wpas_network_disabled(wpa_s, ssid) && |
fea7c3a0 | 1005 | ssid->key_mgmt == WPA_KEY_MGMT_WPS) { |
aa283ddd JM |
1006 | /* |
1007 | * Normal scan is more reliable and faster for WPS | |
1008 | * operations and since these are for short periods of | |
1009 | * time, the benefit of trying to use sched_scan would | |
1010 | * be limited. | |
1011 | */ | |
1012 | wpa_dbg(wpa_s, MSG_DEBUG, "Use normal scan instead of " | |
1013 | "sched_scan for WPS"); | |
1014 | return -1; | |
1015 | } | |
1016 | #endif /* CONFIG_WPS */ | |
0b7a25c0 JM |
1017 | } |
1018 | if (wildcard) | |
1019 | need_ssids++; | |
1020 | ||
1021 | if (wpa_s->normal_scans < 3 && | |
1022 | (need_ssids <= wpa_s->max_scan_ssids || | |
1023 | wpa_s->max_scan_ssids >= (int) max_sched_scan_ssids)) { | |
1024 | /* | |
1025 | * When normal scan can speed up operations, use that for the | |
1026 | * first operations before starting the sched_scan to allow | |
1027 | * user space sleep more. We do this only if the normal scan | |
1028 | * has functionality that is suitable for this or if the | |
1029 | * sched_scan does not have better support for multiple SSIDs. | |
1030 | */ | |
1031 | wpa_dbg(wpa_s, MSG_DEBUG, "Use normal scan instead of " | |
1032 | "sched_scan for initial scans (normal_scans=%d)", | |
1033 | wpa_s->normal_scans); | |
1034 | return -1; | |
1035 | } | |
1036 | ||
cbdf3507 LC |
1037 | os_memset(¶ms, 0, sizeof(params)); |
1038 | ||
b59e6f26 LC |
1039 | /* If we can't allocate space for the filters, we just don't filter */ |
1040 | params.filter_ssids = os_zalloc(wpa_s->max_match_sets * | |
1041 | sizeof(struct wpa_driver_scan_filter)); | |
1042 | ||
cbdf3507 LC |
1043 | prev_state = wpa_s->wpa_state; |
1044 | if (wpa_s->wpa_state == WPA_DISCONNECTED || | |
1045 | wpa_s->wpa_state == WPA_INACTIVE) | |
1046 | wpa_supplicant_set_state(wpa_s, WPA_SCANNING); | |
1047 | ||
7c865c68 TB |
1048 | if (wpa_s->autoscan_params != NULL) { |
1049 | scan_params = wpa_s->autoscan_params; | |
1050 | goto scan; | |
1051 | } | |
1052 | ||
cbdf3507 LC |
1053 | /* Find the starting point from which to continue scanning */ |
1054 | ssid = wpa_s->conf->ssid; | |
1055 | if (wpa_s->prev_sched_ssid) { | |
1056 | while (ssid) { | |
1057 | if (ssid == wpa_s->prev_sched_ssid) { | |
1058 | ssid = ssid->next; | |
1059 | break; | |
1060 | } | |
1061 | ssid = ssid->next; | |
1062 | } | |
1063 | } | |
1064 | ||
1065 | if (!ssid || !wpa_s->prev_sched_ssid) { | |
1066 | wpa_dbg(wpa_s, MSG_DEBUG, "Beginning of SSID list"); | |
4aa81868 SF |
1067 | if (wpa_s->conf->sched_scan_interval) |
1068 | wpa_s->sched_scan_interval = | |
1069 | wpa_s->conf->sched_scan_interval; | |
7c865c68 TB |
1070 | if (wpa_s->sched_scan_interval == 0) |
1071 | wpa_s->sched_scan_interval = 10; | |
cbdf3507 LC |
1072 | wpa_s->sched_scan_timeout = max_sched_scan_ssids * 2; |
1073 | wpa_s->first_sched_scan = 1; | |
1074 | ssid = wpa_s->conf->ssid; | |
1075 | wpa_s->prev_sched_ssid = ssid; | |
1076 | } | |
1077 | ||
76a5249e JM |
1078 | if (wildcard) { |
1079 | wpa_dbg(wpa_s, MSG_DEBUG, "Add wildcard SSID to sched_scan"); | |
1080 | params.num_ssids++; | |
1081 | } | |
1082 | ||
cbdf3507 | 1083 | while (ssid) { |
349493bd | 1084 | if (wpas_network_disabled(wpa_s, ssid)) |
5edddf41 | 1085 | goto next; |
cbdf3507 | 1086 | |
fcd16847 JM |
1087 | if (params.num_filter_ssids < wpa_s->max_match_sets && |
1088 | params.filter_ssids && ssid->ssid && ssid->ssid_len) { | |
1966e3d1 ES |
1089 | wpa_dbg(wpa_s, MSG_DEBUG, "add to filter ssid: %s", |
1090 | wpa_ssid_txt(ssid->ssid, ssid->ssid_len)); | |
b59e6f26 LC |
1091 | os_memcpy(params.filter_ssids[params.num_filter_ssids].ssid, |
1092 | ssid->ssid, ssid->ssid_len); | |
1093 | params.filter_ssids[params.num_filter_ssids].ssid_len = | |
1094 | ssid->ssid_len; | |
1095 | params.num_filter_ssids++; | |
86b47aaf JM |
1096 | } else if (params.filter_ssids && ssid->ssid && ssid->ssid_len) |
1097 | { | |
1098 | wpa_dbg(wpa_s, MSG_DEBUG, "Not enough room for SSID " | |
1099 | "filter for sched_scan - drop filter"); | |
1100 | os_free(params.filter_ssids); | |
1101 | params.filter_ssids = NULL; | |
1102 | params.num_filter_ssids = 0; | |
b59e6f26 LC |
1103 | } |
1104 | ||
3f56f3a4 | 1105 | if (ssid->scan_ssid && ssid->ssid && ssid->ssid_len) { |
76a5249e JM |
1106 | if (params.num_ssids == max_sched_scan_ssids) |
1107 | break; /* only room for broadcast SSID */ | |
3f56f3a4 JM |
1108 | wpa_dbg(wpa_s, MSG_DEBUG, |
1109 | "add to active scan ssid: %s", | |
1966e3d1 | 1110 | wpa_ssid_txt(ssid->ssid, ssid->ssid_len)); |
cbdf3507 LC |
1111 | params.ssids[params.num_ssids].ssid = |
1112 | ssid->ssid; | |
1113 | params.ssids[params.num_ssids].ssid_len = | |
1114 | ssid->ssid_len; | |
1115 | params.num_ssids++; | |
b59e6f26 | 1116 | if (params.num_ssids >= max_sched_scan_ssids) { |
cbdf3507 | 1117 | wpa_s->prev_sched_ssid = ssid; |
b55aca46 JM |
1118 | do { |
1119 | ssid = ssid->next; | |
1120 | } while (ssid && | |
349493bd | 1121 | (wpas_network_disabled(wpa_s, ssid) || |
fea7c3a0 | 1122 | !ssid->scan_ssid)); |
cbdf3507 LC |
1123 | break; |
1124 | } | |
1125 | } | |
b59e6f26 | 1126 | |
5edddf41 | 1127 | next: |
cbdf3507 LC |
1128 | wpa_s->prev_sched_ssid = ssid; |
1129 | ssid = ssid->next; | |
1130 | } | |
1131 | ||
7c6a266c JM |
1132 | if (params.num_filter_ssids == 0) { |
1133 | os_free(params.filter_ssids); | |
1134 | params.filter_ssids = NULL; | |
1135 | } | |
1136 | ||
a13e07ec ES |
1137 | extra_ie = wpa_supplicant_extra_ies(wpa_s); |
1138 | if (extra_ie) { | |
1139 | params.extra_ies = wpabuf_head(extra_ie); | |
1140 | params.extra_ies_len = wpabuf_len(extra_ie); | |
1141 | } | |
cbdf3507 | 1142 | |
7c865c68 TB |
1143 | scan_params = ¶ms; |
1144 | ||
1145 | scan: | |
a8cb5a88 | 1146 | if (ssid || !wpa_s->first_sched_scan) { |
a8cb5a88 JM |
1147 | wpa_dbg(wpa_s, MSG_DEBUG, |
1148 | "Starting sched scan: interval %d timeout %d", | |
1149 | wpa_s->sched_scan_interval, wpa_s->sched_scan_timeout); | |
7d21a223 JM |
1150 | } else { |
1151 | wpa_dbg(wpa_s, MSG_DEBUG, | |
1152 | "Starting sched scan: interval %d (no timeout)", | |
1153 | wpa_s->sched_scan_interval); | |
a8cb5a88 | 1154 | } |
cbdf3507 | 1155 | |
faf9a858 JM |
1156 | wpa_setband_scan_freqs(wpa_s, scan_params); |
1157 | ||
7c865c68 | 1158 | ret = wpa_supplicant_start_sched_scan(wpa_s, scan_params, |
cbdf3507 | 1159 | wpa_s->sched_scan_interval); |
a13e07ec | 1160 | wpabuf_free(extra_ie); |
b59e6f26 | 1161 | os_free(params.filter_ssids); |
cbdf3507 LC |
1162 | if (ret) { |
1163 | wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate sched scan"); | |
1164 | if (prev_state != wpa_s->wpa_state) | |
1165 | wpa_supplicant_set_state(wpa_s, prev_state); | |
1166 | return ret; | |
1167 | } | |
1168 | ||
1169 | /* If we have more SSIDs to scan, add a timeout so we scan them too */ | |
1170 | if (ssid || !wpa_s->first_sched_scan) { | |
1171 | wpa_s->sched_scan_timed_out = 0; | |
1172 | eloop_register_timeout(wpa_s->sched_scan_timeout, 0, | |
1173 | wpa_supplicant_sched_scan_timeout, | |
1174 | wpa_s, NULL); | |
1175 | wpa_s->first_sched_scan = 0; | |
1176 | wpa_s->sched_scan_timeout /= 2; | |
1177 | wpa_s->sched_scan_interval *= 2; | |
a09fc1cc DS |
1178 | if (wpa_s->sched_scan_timeout < wpa_s->sched_scan_interval) { |
1179 | wpa_s->sched_scan_interval = 10; | |
1180 | wpa_s->sched_scan_timeout = max_sched_scan_ssids * 2; | |
1181 | } | |
cbdf3507 LC |
1182 | } |
1183 | ||
7ed52f67 DS |
1184 | /* If there is no more ssids, start next time from the beginning */ |
1185 | if (!ssid) | |
1186 | wpa_s->prev_sched_ssid = NULL; | |
1187 | ||
cbdf3507 LC |
1188 | return 0; |
1189 | } | |
1190 | ||
1191 | ||
6fc6879b JM |
1192 | /** |
1193 | * wpa_supplicant_cancel_scan - Cancel a scheduled scan request | |
1194 | * @wpa_s: Pointer to wpa_supplicant data | |
1195 | * | |
1196 | * This function is used to cancel a scan request scheduled with | |
1197 | * wpa_supplicant_req_scan(). | |
1198 | */ | |
1199 | void wpa_supplicant_cancel_scan(struct wpa_supplicant *wpa_s) | |
1200 | { | |
f049052b | 1201 | wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling scan request"); |
6fc6879b | 1202 | eloop_cancel_timeout(wpa_supplicant_scan, wpa_s, NULL); |
b1cd021e | 1203 | wpas_p2p_continue_after_scan(wpa_s); |
6fc6879b | 1204 | } |
cb8564b1 DW |
1205 | |
1206 | ||
831770bf CZ |
1207 | /** |
1208 | * wpa_supplicant_cancel_delayed_sched_scan - Stop a delayed scheduled scan | |
1209 | * @wpa_s: Pointer to wpa_supplicant data | |
1210 | * | |
1211 | * This function is used to stop a delayed scheduled scan. | |
1212 | */ | |
1213 | void wpa_supplicant_cancel_delayed_sched_scan(struct wpa_supplicant *wpa_s) | |
1214 | { | |
1215 | if (!wpa_s->sched_scan_supported) | |
1216 | return; | |
1217 | ||
1218 | wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling delayed sched scan"); | |
1219 | eloop_cancel_timeout(wpa_supplicant_delayed_sched_scan_timeout, | |
1220 | wpa_s, NULL); | |
1221 | } | |
1222 | ||
1223 | ||
cbdf3507 LC |
1224 | /** |
1225 | * wpa_supplicant_cancel_sched_scan - Stop running scheduled scans | |
1226 | * @wpa_s: Pointer to wpa_supplicant data | |
1227 | * | |
1228 | * This function is used to stop a periodic scheduled scan. | |
1229 | */ | |
1230 | void wpa_supplicant_cancel_sched_scan(struct wpa_supplicant *wpa_s) | |
1231 | { | |
1232 | if (!wpa_s->sched_scanning) | |
1233 | return; | |
1234 | ||
1235 | wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling sched scan"); | |
1236 | eloop_cancel_timeout(wpa_supplicant_sched_scan_timeout, wpa_s, NULL); | |
1237 | wpa_supplicant_stop_sched_scan(wpa_s); | |
1238 | } | |
1239 | ||
1240 | ||
2c09af30 JM |
1241 | /** |
1242 | * wpa_supplicant_notify_scanning - Indicate possible scan state change | |
1243 | * @wpa_s: Pointer to wpa_supplicant data | |
1244 | * @scanning: Whether scanning is currently in progress | |
1245 | * | |
1246 | * This function is to generate scanning notifycations. It is called whenever | |
1247 | * there may have been a change in scanning (scan started, completed, stopped). | |
1248 | * wpas_notify_scanning() is called whenever the scanning state changed from the | |
1249 | * previously notified state. | |
1250 | */ | |
cb8564b1 DW |
1251 | void wpa_supplicant_notify_scanning(struct wpa_supplicant *wpa_s, |
1252 | int scanning) | |
1253 | { | |
1254 | if (wpa_s->scanning != scanning) { | |
1255 | wpa_s->scanning = scanning; | |
8bac466b | 1256 | wpas_notify_scanning(wpa_s); |
cb8564b1 DW |
1257 | } |
1258 | } | |
1259 | ||
9ba9fa07 JM |
1260 | |
1261 | static int wpa_scan_get_max_rate(const struct wpa_scan_res *res) | |
1262 | { | |
1263 | int rate = 0; | |
1264 | const u8 *ie; | |
1265 | int i; | |
1266 | ||
1267 | ie = wpa_scan_get_ie(res, WLAN_EID_SUPP_RATES); | |
1268 | for (i = 0; ie && i < ie[1]; i++) { | |
1269 | if ((ie[i + 2] & 0x7f) > rate) | |
1270 | rate = ie[i + 2] & 0x7f; | |
1271 | } | |
1272 | ||
1273 | ie = wpa_scan_get_ie(res, WLAN_EID_EXT_SUPP_RATES); | |
1274 | for (i = 0; ie && i < ie[1]; i++) { | |
1275 | if ((ie[i + 2] & 0x7f) > rate) | |
1276 | rate = ie[i + 2] & 0x7f; | |
1277 | } | |
1278 | ||
1279 | return rate; | |
1280 | } | |
1281 | ||
1282 | ||
2c09af30 JM |
1283 | /** |
1284 | * wpa_scan_get_ie - Fetch a specified information element from a scan result | |
1285 | * @res: Scan result entry | |
1286 | * @ie: Information element identitifier (WLAN_EID_*) | |
1287 | * Returns: Pointer to the information element (id field) or %NULL if not found | |
1288 | * | |
1289 | * This function returns the first matching information element in the scan | |
1290 | * result. | |
1291 | */ | |
d1f9c410 JM |
1292 | const u8 * wpa_scan_get_ie(const struct wpa_scan_res *res, u8 ie) |
1293 | { | |
1294 | const u8 *end, *pos; | |
1295 | ||
1296 | pos = (const u8 *) (res + 1); | |
1297 | end = pos + res->ie_len; | |
1298 | ||
1299 | while (pos + 1 < end) { | |
1300 | if (pos + 2 + pos[1] > end) | |
1301 | break; | |
1302 | if (pos[0] == ie) | |
1303 | return pos; | |
1304 | pos += 2 + pos[1]; | |
1305 | } | |
1306 | ||
1307 | return NULL; | |
1308 | } | |
1309 | ||
1310 | ||
2c09af30 JM |
1311 | /** |
1312 | * wpa_scan_get_vendor_ie - Fetch vendor information element from a scan result | |
1313 | * @res: Scan result entry | |
1314 | * @vendor_type: Vendor type (four octets starting the IE payload) | |
1315 | * Returns: Pointer to the information element (id field) or %NULL if not found | |
1316 | * | |
1317 | * This function returns the first matching information element in the scan | |
1318 | * result. | |
1319 | */ | |
9ba9fa07 JM |
1320 | const u8 * wpa_scan_get_vendor_ie(const struct wpa_scan_res *res, |
1321 | u32 vendor_type) | |
1322 | { | |
1323 | const u8 *end, *pos; | |
1324 | ||
1325 | pos = (const u8 *) (res + 1); | |
1326 | end = pos + res->ie_len; | |
1327 | ||
1328 | while (pos + 1 < end) { | |
1329 | if (pos + 2 + pos[1] > end) | |
1330 | break; | |
1331 | if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 && | |
1332 | vendor_type == WPA_GET_BE32(&pos[2])) | |
1333 | return pos; | |
1334 | pos += 2 + pos[1]; | |
1335 | } | |
1336 | ||
1337 | return NULL; | |
1338 | } | |
1339 | ||
1340 | ||
aaeb9c98 JM |
1341 | /** |
1342 | * wpa_scan_get_vendor_ie_beacon - Fetch vendor information from a scan result | |
1343 | * @res: Scan result entry | |
1344 | * @vendor_type: Vendor type (four octets starting the IE payload) | |
1345 | * Returns: Pointer to the information element (id field) or %NULL if not found | |
1346 | * | |
1347 | * This function returns the first matching information element in the scan | |
1348 | * result. | |
1349 | * | |
1350 | * This function is like wpa_scan_get_vendor_ie(), but uses IE buffer only | |
1351 | * from Beacon frames instead of either Beacon or Probe Response frames. | |
1352 | */ | |
1353 | const u8 * wpa_scan_get_vendor_ie_beacon(const struct wpa_scan_res *res, | |
1354 | u32 vendor_type) | |
1355 | { | |
1356 | const u8 *end, *pos; | |
1357 | ||
1358 | if (res->beacon_ie_len == 0) | |
1359 | return NULL; | |
1360 | ||
1361 | pos = (const u8 *) (res + 1); | |
1362 | pos += res->ie_len; | |
1363 | end = pos + res->beacon_ie_len; | |
1364 | ||
1365 | while (pos + 1 < end) { | |
1366 | if (pos + 2 + pos[1] > end) | |
1367 | break; | |
1368 | if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 && | |
1369 | vendor_type == WPA_GET_BE32(&pos[2])) | |
1370 | return pos; | |
1371 | pos += 2 + pos[1]; | |
1372 | } | |
1373 | ||
1374 | return NULL; | |
1375 | } | |
1376 | ||
1377 | ||
2c09af30 JM |
1378 | /** |
1379 | * wpa_scan_get_vendor_ie_multi - Fetch vendor IE data from a scan result | |
1380 | * @res: Scan result entry | |
1381 | * @vendor_type: Vendor type (four octets starting the IE payload) | |
1382 | * Returns: Pointer to the information element payload or %NULL if not found | |
1383 | * | |
1384 | * This function returns concatenated payload of possibly fragmented vendor | |
1385 | * specific information elements in the scan result. The caller is responsible | |
1386 | * for freeing the returned buffer. | |
1387 | */ | |
9ba9fa07 JM |
1388 | struct wpabuf * wpa_scan_get_vendor_ie_multi(const struct wpa_scan_res *res, |
1389 | u32 vendor_type) | |
1390 | { | |
1391 | struct wpabuf *buf; | |
1392 | const u8 *end, *pos; | |
1393 | ||
1394 | buf = wpabuf_alloc(res->ie_len); | |
1395 | if (buf == NULL) | |
1396 | return NULL; | |
1397 | ||
1398 | pos = (const u8 *) (res + 1); | |
1399 | end = pos + res->ie_len; | |
1400 | ||
54f489be JM |
1401 | while (pos + 1 < end) { |
1402 | if (pos + 2 + pos[1] > end) | |
1403 | break; | |
1404 | if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 && | |
1405 | vendor_type == WPA_GET_BE32(&pos[2])) | |
1406 | wpabuf_put_data(buf, pos + 2 + 4, pos[1] - 4); | |
1407 | pos += 2 + pos[1]; | |
1408 | } | |
1409 | ||
1410 | if (wpabuf_len(buf) == 0) { | |
1411 | wpabuf_free(buf); | |
1412 | buf = NULL; | |
1413 | } | |
1414 | ||
1415 | return buf; | |
1416 | } | |
1417 | ||
1418 | ||
577db0ae GM |
1419 | /* |
1420 | * Channels with a great SNR can operate at full rate. What is a great SNR? | |
1421 | * This doc https://supportforums.cisco.com/docs/DOC-12954 says, "the general | |
1422 | * rule of thumb is that any SNR above 20 is good." This one | |
1423 | * http://www.cisco.com/en/US/tech/tk722/tk809/technologies_q_and_a_item09186a00805e9a96.shtml#qa23 | |
1424 | * recommends 25 as a minimum SNR for 54 Mbps data rate. 30 is chosen here as a | |
1425 | * conservative value. | |
1426 | */ | |
1427 | #define GREAT_SNR 30 | |
1428 | ||
9ba9fa07 JM |
1429 | /* Compare function for sorting scan results. Return >0 if @b is considered |
1430 | * better. */ | |
1431 | static int wpa_scan_result_compar(const void *a, const void *b) | |
1432 | { | |
577db0ae GM |
1433 | #define IS_5GHZ(n) (n > 4000) |
1434 | #define MIN(a,b) a < b ? a : b | |
9ba9fa07 JM |
1435 | struct wpa_scan_res **_wa = (void *) a; |
1436 | struct wpa_scan_res **_wb = (void *) b; | |
1437 | struct wpa_scan_res *wa = *_wa; | |
1438 | struct wpa_scan_res *wb = *_wb; | |
1439 | int wpa_a, wpa_b, maxrate_a, maxrate_b; | |
577db0ae | 1440 | int snr_a, snr_b; |
9ba9fa07 JM |
1441 | |
1442 | /* WPA/WPA2 support preferred */ | |
1443 | wpa_a = wpa_scan_get_vendor_ie(wa, WPA_IE_VENDOR_TYPE) != NULL || | |
1444 | wpa_scan_get_ie(wa, WLAN_EID_RSN) != NULL; | |
1445 | wpa_b = wpa_scan_get_vendor_ie(wb, WPA_IE_VENDOR_TYPE) != NULL || | |
1446 | wpa_scan_get_ie(wb, WLAN_EID_RSN) != NULL; | |
1447 | ||
1448 | if (wpa_b && !wpa_a) | |
1449 | return 1; | |
1450 | if (!wpa_b && wpa_a) | |
1451 | return -1; | |
1452 | ||
1453 | /* privacy support preferred */ | |
1454 | if ((wa->caps & IEEE80211_CAP_PRIVACY) == 0 && | |
1455 | (wb->caps & IEEE80211_CAP_PRIVACY)) | |
1456 | return 1; | |
1457 | if ((wa->caps & IEEE80211_CAP_PRIVACY) && | |
1458 | (wb->caps & IEEE80211_CAP_PRIVACY) == 0) | |
1459 | return -1; | |
1460 | ||
577db0ae GM |
1461 | if ((wa->flags & wb->flags & WPA_SCAN_LEVEL_DBM) && |
1462 | !((wa->flags | wb->flags) & WPA_SCAN_NOISE_INVALID)) { | |
1463 | snr_a = MIN(wa->level - wa->noise, GREAT_SNR); | |
1464 | snr_b = MIN(wb->level - wb->noise, GREAT_SNR); | |
1465 | } else { | |
1466 | /* Not suitable information to calculate SNR, so use level */ | |
1467 | snr_a = wa->level; | |
1468 | snr_b = wb->level; | |
1469 | } | |
1470 | ||
577db0ae GM |
1471 | /* best/max rate preferred if SNR close enough */ |
1472 | if ((snr_a && snr_b && abs(snr_b - snr_a) < 5) || | |
9ba9fa07 JM |
1473 | (wa->qual && wb->qual && abs(wb->qual - wa->qual) < 10)) { |
1474 | maxrate_a = wpa_scan_get_max_rate(wa); | |
1475 | maxrate_b = wpa_scan_get_max_rate(wb); | |
1476 | if (maxrate_a != maxrate_b) | |
1477 | return maxrate_b - maxrate_a; | |
577db0ae GM |
1478 | if (IS_5GHZ(wa->freq) ^ IS_5GHZ(wb->freq)) |
1479 | return IS_5GHZ(wa->freq) ? -1 : 1; | |
9ba9fa07 JM |
1480 | } |
1481 | ||
1482 | /* use freq for channel preference */ | |
1483 | ||
577db0ae | 1484 | /* all things being equal, use SNR; if SNRs are |
9ba9fa07 JM |
1485 | * identical, use quality values since some drivers may only report |
1486 | * that value and leave the signal level zero */ | |
577db0ae | 1487 | if (snr_b == snr_a) |
9ba9fa07 | 1488 | return wb->qual - wa->qual; |
577db0ae GM |
1489 | return snr_b - snr_a; |
1490 | #undef MIN | |
1491 | #undef IS_5GHZ | |
9ba9fa07 JM |
1492 | } |
1493 | ||
1494 | ||
41e650ae JM |
1495 | #ifdef CONFIG_WPS |
1496 | /* Compare function for sorting scan results when searching a WPS AP for | |
1497 | * provisioning. Return >0 if @b is considered better. */ | |
1498 | static int wpa_scan_result_wps_compar(const void *a, const void *b) | |
1499 | { | |
1500 | struct wpa_scan_res **_wa = (void *) a; | |
1501 | struct wpa_scan_res **_wb = (void *) b; | |
1502 | struct wpa_scan_res *wa = *_wa; | |
1503 | struct wpa_scan_res *wb = *_wb; | |
1504 | int uses_wps_a, uses_wps_b; | |
1505 | struct wpabuf *wps_a, *wps_b; | |
1506 | int res; | |
1507 | ||
1508 | /* Optimization - check WPS IE existence before allocated memory and | |
1509 | * doing full reassembly. */ | |
1510 | uses_wps_a = wpa_scan_get_vendor_ie(wa, WPS_IE_VENDOR_TYPE) != NULL; | |
1511 | uses_wps_b = wpa_scan_get_vendor_ie(wb, WPS_IE_VENDOR_TYPE) != NULL; | |
1512 | if (uses_wps_a && !uses_wps_b) | |
1513 | return -1; | |
1514 | if (!uses_wps_a && uses_wps_b) | |
1515 | return 1; | |
1516 | ||
1517 | if (uses_wps_a && uses_wps_b) { | |
1518 | wps_a = wpa_scan_get_vendor_ie_multi(wa, WPS_IE_VENDOR_TYPE); | |
1519 | wps_b = wpa_scan_get_vendor_ie_multi(wb, WPS_IE_VENDOR_TYPE); | |
1520 | res = wps_ap_priority_compar(wps_a, wps_b); | |
1521 | wpabuf_free(wps_a); | |
1522 | wpabuf_free(wps_b); | |
1523 | if (res) | |
1524 | return res; | |
1525 | } | |
1526 | ||
1527 | /* | |
1528 | * Do not use current AP security policy as a sorting criteria during | |
1529 | * WPS provisioning step since the AP may get reconfigured at the | |
1530 | * completion of provisioning. | |
1531 | */ | |
1532 | ||
1533 | /* all things being equal, use signal level; if signal levels are | |
1534 | * identical, use quality values since some drivers may only report | |
1535 | * that value and leave the signal level zero */ | |
1536 | if (wb->level == wa->level) | |
1537 | return wb->qual - wa->qual; | |
1538 | return wb->level - wa->level; | |
1539 | } | |
1540 | #endif /* CONFIG_WPS */ | |
1541 | ||
1542 | ||
aa820e02 JM |
1543 | static void dump_scan_res(struct wpa_scan_results *scan_res) |
1544 | { | |
76202aed | 1545 | #ifndef CONFIG_NO_STDOUT_DEBUG |
aa820e02 JM |
1546 | size_t i; |
1547 | ||
1548 | if (scan_res->res == NULL || scan_res->num == 0) | |
1549 | return; | |
1550 | ||
1551 | wpa_printf(MSG_EXCESSIVE, "Sorted scan results"); | |
1552 | ||
1553 | for (i = 0; i < scan_res->num; i++) { | |
1554 | struct wpa_scan_res *r = scan_res->res[i]; | |
1cbe86e2 | 1555 | u8 *pos; |
aa820e02 JM |
1556 | if ((r->flags & (WPA_SCAN_LEVEL_DBM | WPA_SCAN_NOISE_INVALID)) |
1557 | == WPA_SCAN_LEVEL_DBM) { | |
1558 | int snr = r->level - r->noise; | |
1559 | wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d " | |
c5f10e80 JM |
1560 | "noise=%d level=%d snr=%d%s flags=0x%x " |
1561 | "age=%u", | |
aa820e02 JM |
1562 | MAC2STR(r->bssid), r->freq, r->qual, |
1563 | r->noise, r->level, snr, | |
c5f10e80 JM |
1564 | snr >= GREAT_SNR ? "*" : "", r->flags, |
1565 | r->age); | |
aa820e02 JM |
1566 | } else { |
1567 | wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d " | |
c5f10e80 | 1568 | "noise=%d level=%d flags=0x%x age=%u", |
aa820e02 | 1569 | MAC2STR(r->bssid), r->freq, r->qual, |
c5f10e80 | 1570 | r->noise, r->level, r->flags, r->age); |
aa820e02 | 1571 | } |
1cbe86e2 JM |
1572 | pos = (u8 *) (r + 1); |
1573 | if (r->ie_len) | |
1574 | wpa_hexdump(MSG_EXCESSIVE, "IEs", pos, r->ie_len); | |
1575 | pos += r->ie_len; | |
1576 | if (r->beacon_ie_len) | |
1577 | wpa_hexdump(MSG_EXCESSIVE, "Beacon IEs", | |
1578 | pos, r->beacon_ie_len); | |
aa820e02 | 1579 | } |
76202aed | 1580 | #endif /* CONFIG_NO_STDOUT_DEBUG */ |
aa820e02 JM |
1581 | } |
1582 | ||
1583 | ||
2c09af30 JM |
1584 | /** |
1585 | * wpa_supplicant_filter_bssid_match - Is the specified BSSID allowed | |
1586 | * @wpa_s: Pointer to wpa_supplicant data | |
1587 | * @bssid: BSSID to check | |
1588 | * Returns: 0 if the BSSID is filtered or 1 if not | |
1589 | * | |
1590 | * This function is used to filter out specific BSSIDs from scan reslts mainly | |
1591 | * for testing purposes (SET bssid_filter ctrl_iface command). | |
1592 | */ | |
d445a5cd JM |
1593 | int wpa_supplicant_filter_bssid_match(struct wpa_supplicant *wpa_s, |
1594 | const u8 *bssid) | |
1595 | { | |
1596 | size_t i; | |
1597 | ||
1598 | if (wpa_s->bssid_filter == NULL) | |
1599 | return 1; | |
1600 | ||
1601 | for (i = 0; i < wpa_s->bssid_filter_count; i++) { | |
1602 | if (os_memcmp(wpa_s->bssid_filter + i * ETH_ALEN, bssid, | |
1603 | ETH_ALEN) == 0) | |
1604 | return 1; | |
1605 | } | |
1606 | ||
1607 | return 0; | |
1608 | } | |
1609 | ||
1610 | ||
1611 | static void filter_scan_res(struct wpa_supplicant *wpa_s, | |
1612 | struct wpa_scan_results *res) | |
1613 | { | |
1614 | size_t i, j; | |
1615 | ||
1616 | if (wpa_s->bssid_filter == NULL) | |
1617 | return; | |
1618 | ||
1619 | for (i = 0, j = 0; i < res->num; i++) { | |
1620 | if (wpa_supplicant_filter_bssid_match(wpa_s, | |
1621 | res->res[i]->bssid)) { | |
1622 | res->res[j++] = res->res[i]; | |
1623 | } else { | |
1624 | os_free(res->res[i]); | |
1625 | res->res[i] = NULL; | |
1626 | } | |
1627 | } | |
1628 | ||
1629 | if (res->num != j) { | |
1630 | wpa_printf(MSG_DEBUG, "Filtered out %d scan results", | |
1631 | (int) (res->num - j)); | |
1632 | res->num = j; | |
1633 | } | |
1634 | } | |
1635 | ||
1636 | ||
9ba9fa07 JM |
1637 | /** |
1638 | * wpa_supplicant_get_scan_results - Get scan results | |
1639 | * @wpa_s: Pointer to wpa_supplicant data | |
1640 | * @info: Information about what was scanned or %NULL if not available | |
1641 | * @new_scan: Whether a new scan was performed | |
1642 | * Returns: Scan results, %NULL on failure | |
1643 | * | |
1644 | * This function request the current scan results from the driver and updates | |
1645 | * the local BSS list wpa_s->bss. The caller is responsible for freeing the | |
1646 | * results with wpa_scan_results_free(). | |
1647 | */ | |
1648 | struct wpa_scan_results * | |
1649 | wpa_supplicant_get_scan_results(struct wpa_supplicant *wpa_s, | |
1650 | struct scan_info *info, int new_scan) | |
1651 | { | |
1652 | struct wpa_scan_results *scan_res; | |
1653 | size_t i; | |
41e650ae | 1654 | int (*compar)(const void *, const void *) = wpa_scan_result_compar; |
9ba9fa07 | 1655 | |
17fbb751 | 1656 | scan_res = wpa_drv_get_scan_results2(wpa_s); |
9ba9fa07 | 1657 | if (scan_res == NULL) { |
f049052b | 1658 | wpa_dbg(wpa_s, MSG_DEBUG, "Failed to get scan results"); |
9ba9fa07 JM |
1659 | return NULL; |
1660 | } | |
c5f10e80 JM |
1661 | if (scan_res->fetch_time.sec == 0) { |
1662 | /* | |
1663 | * Make sure we have a valid timestamp if the driver wrapper | |
1664 | * does not set this. | |
1665 | */ | |
1666 | os_get_time(&scan_res->fetch_time); | |
1667 | } | |
d445a5cd | 1668 | filter_scan_res(wpa_s, scan_res); |
9ba9fa07 | 1669 | |
41e650ae JM |
1670 | #ifdef CONFIG_WPS |
1671 | if (wpas_wps_in_progress(wpa_s)) { | |
f049052b BG |
1672 | wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Order scan results with WPS " |
1673 | "provisioning rules"); | |
41e650ae JM |
1674 | compar = wpa_scan_result_wps_compar; |
1675 | } | |
1676 | #endif /* CONFIG_WPS */ | |
1677 | ||
9ba9fa07 | 1678 | qsort(scan_res->res, scan_res->num, sizeof(struct wpa_scan_res *), |
41e650ae | 1679 | compar); |
aa820e02 | 1680 | dump_scan_res(scan_res); |
9ba9fa07 JM |
1681 | |
1682 | wpa_bss_update_start(wpa_s); | |
1683 | for (i = 0; i < scan_res->num; i++) | |
c5f10e80 JM |
1684 | wpa_bss_update_scan_res(wpa_s, scan_res->res[i], |
1685 | &scan_res->fetch_time); | |
9ba9fa07 JM |
1686 | wpa_bss_update_end(wpa_s, info, new_scan); |
1687 | ||
1688 | return scan_res; | |
1689 | } | |
1690 | ||
1691 | ||
2c09af30 JM |
1692 | /** |
1693 | * wpa_supplicant_update_scan_results - Update scan results from the driver | |
1694 | * @wpa_s: Pointer to wpa_supplicant data | |
1695 | * Returns: 0 on success, -1 on failure | |
1696 | * | |
1697 | * This function updates the BSS table within wpa_supplicant based on the | |
1698 | * currently available scan results from the driver without requesting a new | |
1699 | * scan. This is used in cases where the driver indicates an association | |
1700 | * (including roaming within ESS) and wpa_supplicant does not yet have the | |
1701 | * needed information to complete the connection (e.g., to perform validation | |
1702 | * steps in 4-way handshake). | |
1703 | */ | |
9ba9fa07 JM |
1704 | int wpa_supplicant_update_scan_results(struct wpa_supplicant *wpa_s) |
1705 | { | |
1706 | struct wpa_scan_results *scan_res; | |
1707 | scan_res = wpa_supplicant_get_scan_results(wpa_s, NULL, 0); | |
1708 | if (scan_res == NULL) | |
1709 | return -1; | |
1710 | wpa_scan_results_free(scan_res); | |
1711 | ||
1712 | return 0; | |
1713 | } | |
66fe0f70 DS |
1714 | |
1715 | ||
1716 | /** | |
1717 | * scan_only_handler - Reports scan results | |
1718 | */ | |
1719 | void scan_only_handler(struct wpa_supplicant *wpa_s, | |
1720 | struct wpa_scan_results *scan_res) | |
1721 | { | |
1722 | wpa_dbg(wpa_s, MSG_DEBUG, "Scan-only results received"); | |
1723 | wpa_msg_ctrl(wpa_s, MSG_INFO, WPA_EVENT_SCAN_RESULTS); | |
1724 | wpas_notify_scan_results(wpa_s); | |
1725 | wpas_notify_scan_done(wpa_s, 1); | |
1726 | } | |
407be00b JM |
1727 | |
1728 | ||
1729 | int wpas_scan_scheduled(struct wpa_supplicant *wpa_s) | |
1730 | { | |
1731 | return eloop_is_timeout_registered(wpa_supplicant_scan, wpa_s, NULL); | |
1732 | } |