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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 | 4 | * |
0f3d578e JM |
5 | * This software may be distributed under the terms of the BSD license. |
6 | * See README for more details. | |
6fc6879b JM |
7 | */ |
8 | ||
9ba9fa07 | 9 | #include "utils/includes.h" |
6fc6879b | 10 | |
9ba9fa07 JM |
11 | #include "utils/common.h" |
12 | #include "utils/eloop.h" | |
13 | #include "common/ieee802_11_defs.h" | |
6fc6879b JM |
14 | #include "config.h" |
15 | #include "wpa_supplicant_i.h" | |
2d5b792d | 16 | #include "driver_i.h" |
b01c18a8 | 17 | #include "wps_supplicant.h" |
0e65037c JM |
18 | #include "p2p_supplicant.h" |
19 | #include "p2p/p2p.h" | |
8bac466b | 20 | #include "notify.h" |
9ba9fa07 JM |
21 | #include "bss.h" |
22 | #include "scan.h" | |
6fc6879b JM |
23 | |
24 | ||
25 | static void wpa_supplicant_gen_assoc_event(struct wpa_supplicant *wpa_s) | |
26 | { | |
27 | struct wpa_ssid *ssid; | |
28 | union wpa_event_data data; | |
29 | ||
30 | ssid = wpa_supplicant_get_ssid(wpa_s); | |
31 | if (ssid == NULL) | |
32 | return; | |
33 | ||
8bac466b | 34 | if (wpa_s->current_ssid == NULL) { |
6fc6879b | 35 | wpa_s->current_ssid = ssid; |
8bac466b JM |
36 | if (wpa_s->current_ssid != NULL) |
37 | wpas_notify_network_changed(wpa_s); | |
38 | } | |
6fc6879b | 39 | wpa_supplicant_initiate_eapol(wpa_s); |
f049052b BG |
40 | wpa_dbg(wpa_s, MSG_DEBUG, "Already associated with a configured " |
41 | "network - generating associated event"); | |
6fc6879b JM |
42 | os_memset(&data, 0, sizeof(data)); |
43 | wpa_supplicant_event(wpa_s, EVENT_ASSOC, &data); | |
44 | } | |
45 | ||
46 | ||
ad08c363 | 47 | #ifdef CONFIG_WPS |
5f738a21 | 48 | static int wpas_wps_in_use(struct wpa_supplicant *wpa_s, |
f90c86d4 | 49 | enum wps_request_type *req_type) |
ad08c363 JM |
50 | { |
51 | struct wpa_ssid *ssid; | |
52 | int wps = 0; | |
ad08c363 | 53 | |
5f738a21 | 54 | for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) { |
ad08c363 JM |
55 | if (!(ssid->key_mgmt & WPA_KEY_MGMT_WPS)) |
56 | continue; | |
57 | ||
58 | wps = 1; | |
b01c18a8 | 59 | *req_type = wpas_wps_get_req_type(ssid); |
ad08c363 JM |
60 | if (!ssid->eap.phase1) |
61 | continue; | |
62 | ||
ad08c363 JM |
63 | if (os_strstr(ssid->eap.phase1, "pbc=1")) |
64 | return 2; | |
65 | } | |
66 | ||
5f738a21 | 67 | #ifdef CONFIG_P2P |
b21ff9cb JM |
68 | if (!wpa_s->global->p2p_disabled && wpa_s->global->p2p) { |
69 | wpa_s->wps->dev.p2p = 1; | |
70 | if (!wps) { | |
71 | wps = 1; | |
72 | *req_type = WPS_REQ_ENROLLEE_INFO; | |
73 | } | |
5f738a21 LC |
74 | } |
75 | #endif /* CONFIG_P2P */ | |
76 | ||
ad08c363 JM |
77 | return wps; |
78 | } | |
79 | #endif /* CONFIG_WPS */ | |
80 | ||
e76baaac | 81 | |
4f34d51a | 82 | int wpa_supplicant_enabled_networks(struct wpa_config *conf) |
e76baaac JM |
83 | { |
84 | struct wpa_ssid *ssid = conf->ssid; | |
5471c343 | 85 | int count = 0; |
e76baaac | 86 | while (ssid) { |
fea7c3a0 | 87 | if (!wpas_network_disabled(ssid)) |
5471c343 | 88 | count++; |
e76baaac JM |
89 | ssid = ssid->next; |
90 | } | |
5471c343 | 91 | return count; |
e76baaac JM |
92 | } |
93 | ||
94 | ||
95 | static void wpa_supplicant_assoc_try(struct wpa_supplicant *wpa_s, | |
96 | struct wpa_ssid *ssid) | |
97 | { | |
98 | while (ssid) { | |
fea7c3a0 | 99 | if (!wpas_network_disabled(ssid)) |
e76baaac JM |
100 | break; |
101 | ssid = ssid->next; | |
102 | } | |
103 | ||
104 | /* ap_scan=2 mode - try to associate with each SSID. */ | |
105 | if (ssid == NULL) { | |
f049052b BG |
106 | wpa_dbg(wpa_s, MSG_DEBUG, "wpa_supplicant_assoc_try: Reached " |
107 | "end of scan list - go back to beginning"); | |
ba2a573c | 108 | wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN; |
e76baaac JM |
109 | wpa_supplicant_req_scan(wpa_s, 0, 0); |
110 | return; | |
111 | } | |
112 | if (ssid->next) { | |
113 | /* Continue from the next SSID on the next attempt. */ | |
114 | wpa_s->prev_scan_ssid = ssid; | |
115 | } else { | |
116 | /* Start from the beginning of the SSID list. */ | |
ba2a573c | 117 | wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN; |
e76baaac JM |
118 | } |
119 | wpa_supplicant_associate(wpa_s, NULL, ssid); | |
120 | } | |
121 | ||
122 | ||
d3a98225 JM |
123 | static int int_array_len(const int *a) |
124 | { | |
125 | int i; | |
126 | for (i = 0; a && a[i]; i++) | |
127 | ; | |
128 | return i; | |
129 | } | |
130 | ||
131 | ||
132 | static void int_array_concat(int **res, const int *a) | |
133 | { | |
134 | int reslen, alen, i; | |
135 | int *n; | |
136 | ||
137 | reslen = int_array_len(*res); | |
138 | alen = int_array_len(a); | |
139 | ||
140 | n = os_realloc(*res, (reslen + alen + 1) * sizeof(int)); | |
141 | if (n == NULL) { | |
142 | os_free(*res); | |
143 | *res = NULL; | |
e6c0ebff | 144 | return; |
d3a98225 JM |
145 | } |
146 | for (i = 0; i <= alen; i++) | |
147 | n[reslen + i] = a[i]; | |
148 | *res = n; | |
149 | } | |
150 | ||
151 | ||
152 | static int freq_cmp(const void *a, const void *b) | |
153 | { | |
154 | int _a = *(int *) a; | |
155 | int _b = *(int *) b; | |
156 | ||
157 | if (_a == 0) | |
158 | return 1; | |
159 | if (_b == 0) | |
160 | return -1; | |
161 | return _a - _b; | |
162 | } | |
163 | ||
164 | ||
165 | static void int_array_sort_unique(int *a) | |
166 | { | |
167 | int alen; | |
168 | int i, j; | |
169 | ||
170 | if (a == NULL) | |
171 | return; | |
172 | ||
173 | alen = int_array_len(a); | |
174 | qsort(a, alen, sizeof(int), freq_cmp); | |
175 | ||
176 | i = 0; | |
177 | j = 1; | |
178 | while (a[i] && a[j]) { | |
179 | if (a[i] == a[j]) { | |
180 | j++; | |
181 | continue; | |
182 | } | |
183 | a[++i] = a[j++]; | |
184 | } | |
185 | if (a[i]) | |
186 | i++; | |
187 | a[i] = 0; | |
188 | } | |
189 | ||
190 | ||
60b94c98 JM |
191 | int wpa_supplicant_trigger_scan(struct wpa_supplicant *wpa_s, |
192 | struct wpa_driver_scan_params *params) | |
193 | { | |
194 | int ret; | |
195 | ||
196 | wpa_supplicant_notify_scanning(wpa_s, 1); | |
197 | ||
17fbb751 | 198 | ret = wpa_drv_scan(wpa_s, params); |
60b94c98 JM |
199 | if (ret) { |
200 | wpa_supplicant_notify_scanning(wpa_s, 0); | |
201 | wpas_notify_scan_done(wpa_s, 0); | |
0b7a25c0 | 202 | } else { |
60b94c98 | 203 | wpa_s->scan_runs++; |
0b7a25c0 JM |
204 | wpa_s->normal_scans++; |
205 | } | |
60b94c98 JM |
206 | |
207 | return ret; | |
208 | } | |
209 | ||
210 | ||
6a90053c LC |
211 | static void |
212 | wpa_supplicant_delayed_sched_scan_timeout(void *eloop_ctx, void *timeout_ctx) | |
213 | { | |
214 | struct wpa_supplicant *wpa_s = eloop_ctx; | |
215 | ||
216 | wpa_dbg(wpa_s, MSG_DEBUG, "Starting delayed sched scan"); | |
217 | ||
218 | if (wpa_supplicant_req_sched_scan(wpa_s)) | |
219 | wpa_supplicant_req_scan(wpa_s, 0, 0); | |
220 | } | |
221 | ||
222 | ||
cbdf3507 LC |
223 | static void |
224 | wpa_supplicant_sched_scan_timeout(void *eloop_ctx, void *timeout_ctx) | |
225 | { | |
226 | struct wpa_supplicant *wpa_s = eloop_ctx; | |
227 | ||
228 | wpa_dbg(wpa_s, MSG_DEBUG, "Sched scan timeout - stopping it"); | |
229 | ||
230 | wpa_s->sched_scan_timed_out = 1; | |
231 | wpa_supplicant_cancel_sched_scan(wpa_s); | |
232 | } | |
233 | ||
234 | ||
235 | static int | |
236 | wpa_supplicant_start_sched_scan(struct wpa_supplicant *wpa_s, | |
237 | struct wpa_driver_scan_params *params, | |
238 | int interval) | |
239 | { | |
240 | int ret; | |
241 | ||
cbdf3507 LC |
242 | wpa_supplicant_notify_scanning(wpa_s, 1); |
243 | ret = wpa_drv_sched_scan(wpa_s, params, interval * 1000); | |
244 | if (ret) | |
245 | wpa_supplicant_notify_scanning(wpa_s, 0); | |
246 | else | |
247 | wpa_s->sched_scanning = 1; | |
248 | ||
249 | return ret; | |
250 | } | |
251 | ||
252 | ||
253 | static int wpa_supplicant_stop_sched_scan(struct wpa_supplicant *wpa_s) | |
254 | { | |
255 | int ret; | |
256 | ||
257 | ret = wpa_drv_stop_sched_scan(wpa_s); | |
258 | if (ret) { | |
259 | wpa_dbg(wpa_s, MSG_DEBUG, "stopping sched_scan failed!"); | |
260 | /* TODO: what to do if stopping fails? */ | |
261 | return -1; | |
262 | } | |
263 | ||
264 | return ret; | |
265 | } | |
266 | ||
267 | ||
3812464c JM |
268 | static struct wpa_driver_scan_filter * |
269 | wpa_supplicant_build_filter_ssids(struct wpa_config *conf, size_t *num_ssids) | |
270 | { | |
271 | struct wpa_driver_scan_filter *ssids; | |
272 | struct wpa_ssid *ssid; | |
273 | size_t count; | |
274 | ||
275 | *num_ssids = 0; | |
276 | if (!conf->filter_ssids) | |
277 | return NULL; | |
278 | ||
279 | for (count = 0, ssid = conf->ssid; ssid; ssid = ssid->next) { | |
280 | if (ssid->ssid && ssid->ssid_len) | |
281 | count++; | |
282 | } | |
283 | if (count == 0) | |
284 | return NULL; | |
285 | ssids = os_zalloc(count * sizeof(struct wpa_driver_scan_filter)); | |
286 | if (ssids == NULL) | |
287 | return NULL; | |
288 | ||
289 | for (ssid = conf->ssid; ssid; ssid = ssid->next) { | |
290 | if (!ssid->ssid || !ssid->ssid_len) | |
291 | continue; | |
292 | os_memcpy(ssids[*num_ssids].ssid, ssid->ssid, ssid->ssid_len); | |
293 | ssids[*num_ssids].ssid_len = ssid->ssid_len; | |
294 | (*num_ssids)++; | |
295 | } | |
296 | ||
297 | return ssids; | |
298 | } | |
299 | ||
300 | ||
5f738a21 LC |
301 | static void wpa_supplicant_optimize_freqs( |
302 | struct wpa_supplicant *wpa_s, struct wpa_driver_scan_params *params) | |
303 | { | |
304 | #ifdef CONFIG_P2P | |
305 | if (params->freqs == NULL && wpa_s->p2p_in_provisioning && | |
306 | wpa_s->go_params) { | |
307 | /* Optimize provisioning state scan based on GO information */ | |
308 | if (wpa_s->p2p_in_provisioning < 5 && | |
309 | wpa_s->go_params->freq > 0) { | |
310 | wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only GO " | |
311 | "preferred frequency %d MHz", | |
312 | wpa_s->go_params->freq); | |
313 | params->freqs = os_zalloc(2 * sizeof(int)); | |
314 | if (params->freqs) | |
315 | params->freqs[0] = wpa_s->go_params->freq; | |
316 | } else if (wpa_s->p2p_in_provisioning < 8 && | |
317 | wpa_s->go_params->freq_list[0]) { | |
318 | wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only common " | |
319 | "channels"); | |
320 | int_array_concat(¶ms->freqs, | |
321 | wpa_s->go_params->freq_list); | |
322 | if (params->freqs) | |
323 | int_array_sort_unique(params->freqs); | |
324 | } | |
325 | wpa_s->p2p_in_provisioning++; | |
326 | } | |
327 | #endif /* CONFIG_P2P */ | |
328 | ||
329 | #ifdef CONFIG_WPS | |
330 | if (params->freqs == NULL && wpa_s->after_wps && wpa_s->wps_freq) { | |
331 | /* | |
332 | * Optimize post-provisioning scan based on channel used | |
333 | * during provisioning. | |
334 | */ | |
335 | wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Scan only frequency %u MHz " | |
336 | "that was used during provisioning", wpa_s->wps_freq); | |
337 | params->freqs = os_zalloc(2 * sizeof(int)); | |
338 | if (params->freqs) | |
339 | params->freqs[0] = wpa_s->wps_freq; | |
340 | wpa_s->after_wps--; | |
341 | } | |
342 | ||
1e7fb4f1 JM |
343 | if (params->freqs == NULL && wpa_s->known_wps_freq && wpa_s->wps_freq) |
344 | { | |
345 | /* Optimize provisioning scan based on already known channel */ | |
346 | wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Scan only frequency %u MHz", | |
347 | wpa_s->wps_freq); | |
348 | params->freqs = os_zalloc(2 * sizeof(int)); | |
349 | if (params->freqs) | |
350 | params->freqs[0] = wpa_s->wps_freq; | |
351 | wpa_s->known_wps_freq = 0; /* only do this once */ | |
352 | } | |
5f738a21 LC |
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; |
360182ed JM |
403 | wps_ie = wps_build_probe_req_ie(wps == 2 ? DEV_PW_PUSHBUTTON : |
404 | DEV_PW_DEFAULT, | |
405 | &wpa_s->wps->dev, | |
5f738a21 LC |
406 | wpa_s->wps->uuid, req_type, |
407 | 0, NULL); | |
408 | if (wps_ie) { | |
46ee0427 JM |
409 | if (wpabuf_resize(&extra_ie, wpabuf_len(wps_ie)) == 0) |
410 | wpabuf_put_buf(extra_ie, wps_ie); | |
411 | wpabuf_free(wps_ie); | |
5f738a21 LC |
412 | } |
413 | } | |
414 | ||
415 | #ifdef CONFIG_P2P | |
46ee0427 | 416 | if (wps) { |
5f738a21 | 417 | size_t ielen = p2p_scan_ie_buf_len(wpa_s->global->p2p); |
46ee0427 JM |
418 | if (wpabuf_resize(&extra_ie, ielen) == 0) |
419 | wpas_p2p_scan_ie(wpa_s, extra_ie); | |
5f738a21 LC |
420 | } |
421 | #endif /* CONFIG_P2P */ | |
422 | ||
b01c18a8 | 423 | #endif /* CONFIG_WPS */ |
5f738a21 | 424 | |
46ee0427 | 425 | return extra_ie; |
5f738a21 LC |
426 | } |
427 | ||
428 | ||
429 | static void wpa_supplicant_scan(void *eloop_ctx, void *timeout_ctx) | |
430 | { | |
431 | struct wpa_supplicant *wpa_s = eloop_ctx; | |
432 | struct wpa_ssid *ssid; | |
433 | int scan_req = 0, ret; | |
46ee0427 | 434 | struct wpabuf *extra_ie; |
e76baaac JM |
435 | struct wpa_driver_scan_params params; |
436 | size_t max_ssids; | |
207ef3fb | 437 | enum wpa_states prev_state; |
6fc6879b | 438 | |
8401a6b0 | 439 | if (wpa_s->wpa_state == WPA_INTERFACE_DISABLED) { |
f049052b | 440 | wpa_dbg(wpa_s, MSG_DEBUG, "Skip scan - interface disabled"); |
8401a6b0 JM |
441 | return; |
442 | } | |
443 | ||
3180d7a2 SO |
444 | if (wpa_s->disconnected && !wpa_s->scan_req) { |
445 | wpa_supplicant_set_state(wpa_s, WPA_DISCONNECTED); | |
6fc6879b | 446 | return; |
3180d7a2 | 447 | } |
6fc6879b | 448 | |
e76baaac JM |
449 | if (!wpa_supplicant_enabled_networks(wpa_s->conf) && |
450 | !wpa_s->scan_req) { | |
f049052b | 451 | wpa_dbg(wpa_s, MSG_DEBUG, "No enabled networks - do not scan"); |
6fc6879b JM |
452 | wpa_supplicant_set_state(wpa_s, WPA_INACTIVE); |
453 | return; | |
454 | } | |
6fc6879b | 455 | |
c2a04078 JM |
456 | if (wpa_s->conf->ap_scan != 0 && |
457 | (wpa_s->drv_flags & WPA_DRIVER_FLAGS_WIRED)) { | |
f049052b BG |
458 | wpa_dbg(wpa_s, MSG_DEBUG, "Using wired authentication - " |
459 | "overriding ap_scan configuration"); | |
6fc6879b | 460 | wpa_s->conf->ap_scan = 0; |
8bac466b | 461 | wpas_notify_ap_scan_changed(wpa_s); |
6fc6879b JM |
462 | } |
463 | ||
464 | if (wpa_s->conf->ap_scan == 0) { | |
465 | wpa_supplicant_gen_assoc_event(wpa_s); | |
466 | return; | |
467 | } | |
468 | ||
303f60d3 JM |
469 | #ifdef CONFIG_P2P |
470 | if (wpas_p2p_in_progress(wpa_s)) { | |
471 | if (wpa_s->wpa_state == WPA_SCANNING) { | |
472 | wpa_dbg(wpa_s, MSG_DEBUG, "Delay station mode scan " | |
473 | "while P2P operation is in progress"); | |
474 | wpa_supplicant_req_scan(wpa_s, 5, 0); | |
475 | } else { | |
476 | wpa_dbg(wpa_s, MSG_DEBUG, "Do not request scan while " | |
477 | "P2P operation is in progress"); | |
478 | } | |
479 | return; | |
480 | } | |
481 | #endif /* CONFIG_P2P */ | |
482 | ||
17fbb751 | 483 | if (wpa_s->conf->ap_scan == 2) |
e76baaac JM |
484 | max_ssids = 1; |
485 | else { | |
486 | max_ssids = wpa_s->max_scan_ssids; | |
487 | if (max_ssids > WPAS_MAX_SCAN_SSIDS) | |
488 | max_ssids = WPAS_MAX_SCAN_SSIDS; | |
489 | } | |
490 | ||
e76baaac JM |
491 | scan_req = wpa_s->scan_req; |
492 | wpa_s->scan_req = 0; | |
493 | ||
494 | os_memset(¶ms, 0, sizeof(params)); | |
495 | ||
207ef3fb | 496 | prev_state = wpa_s->wpa_state; |
6fc6879b JM |
497 | if (wpa_s->wpa_state == WPA_DISCONNECTED || |
498 | wpa_s->wpa_state == WPA_INACTIVE) | |
499 | wpa_supplicant_set_state(wpa_s, WPA_SCANNING); | |
500 | ||
7dcdcfd6 JM |
501 | if (scan_req != 2 && wpa_s->connect_without_scan) { |
502 | for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) { | |
503 | if (ssid == wpa_s->connect_without_scan) | |
504 | break; | |
505 | } | |
506 | wpa_s->connect_without_scan = NULL; | |
507 | if (ssid) { | |
508 | wpa_printf(MSG_DEBUG, "Start a pre-selected network " | |
509 | "without scan step"); | |
510 | wpa_supplicant_associate(wpa_s, NULL, ssid); | |
511 | return; | |
512 | } | |
513 | } | |
514 | ||
a21c05db | 515 | #ifdef CONFIG_P2P |
85ea132a JM |
516 | if ((wpa_s->p2p_in_provisioning || wpa_s->show_group_started) && |
517 | wpa_s->go_params) { | |
a21c05db | 518 | wpa_printf(MSG_DEBUG, "P2P: Use specific SSID for scan during " |
85ea132a | 519 | "P2P group formation"); |
a21c05db JM |
520 | params.ssids[0].ssid = wpa_s->go_params->ssid; |
521 | params.ssids[0].ssid_len = wpa_s->go_params->ssid_len; | |
522 | params.num_ssids = 1; | |
523 | goto ssid_list_set; | |
524 | } | |
525 | #endif /* CONFIG_P2P */ | |
526 | ||
e76baaac | 527 | /* Find the starting point from which to continue scanning */ |
6fc6879b | 528 | ssid = wpa_s->conf->ssid; |
ba2a573c | 529 | if (wpa_s->prev_scan_ssid != WILDCARD_SSID_SCAN) { |
6fc6879b JM |
530 | while (ssid) { |
531 | if (ssid == wpa_s->prev_scan_ssid) { | |
532 | ssid = ssid->next; | |
533 | break; | |
534 | } | |
535 | ssid = ssid->next; | |
536 | } | |
537 | } | |
6fc6879b | 538 | |
7dcdcfd6 JM |
539 | if (scan_req != 2 && wpa_s->conf->ap_scan == 2) { |
540 | wpa_s->connect_without_scan = NULL; | |
b3aa456b | 541 | wpa_s->prev_scan_wildcard = 0; |
e76baaac JM |
542 | wpa_supplicant_assoc_try(wpa_s, ssid); |
543 | return; | |
544 | } else if (wpa_s->conf->ap_scan == 2) { | |
6fc6879b | 545 | /* |
ba2a573c JM |
546 | * User-initiated scan request in ap_scan == 2; scan with |
547 | * wildcard SSID. | |
6fc6879b | 548 | */ |
e76baaac JM |
549 | ssid = NULL; |
550 | } else { | |
5be45e2e | 551 | struct wpa_ssid *start = ssid, *tssid; |
d3a98225 | 552 | int freqs_set = 0; |
e76baaac JM |
553 | if (ssid == NULL && max_ssids > 1) |
554 | ssid = wpa_s->conf->ssid; | |
555 | while (ssid) { | |
fea7c3a0 | 556 | if (!wpas_network_disabled(ssid) && ssid->scan_ssid) { |
e76baaac JM |
557 | wpa_hexdump_ascii(MSG_DEBUG, "Scan SSID", |
558 | ssid->ssid, ssid->ssid_len); | |
559 | params.ssids[params.num_ssids].ssid = | |
560 | ssid->ssid; | |
561 | params.ssids[params.num_ssids].ssid_len = | |
562 | ssid->ssid_len; | |
563 | params.num_ssids++; | |
564 | if (params.num_ssids + 1 >= max_ssids) | |
565 | break; | |
566 | } | |
567 | ssid = ssid->next; | |
568 | if (ssid == start) | |
569 | break; | |
570 | if (ssid == NULL && max_ssids > 1 && | |
571 | start != wpa_s->conf->ssid) | |
572 | ssid = wpa_s->conf->ssid; | |
6fc6879b | 573 | } |
d3a98225 | 574 | |
5be45e2e | 575 | for (tssid = wpa_s->conf->ssid; tssid; tssid = tssid->next) { |
fea7c3a0 | 576 | if (wpas_network_disabled(tssid)) |
d3a98225 | 577 | continue; |
5be45e2e | 578 | if ((params.freqs || !freqs_set) && tssid->scan_freq) { |
d3a98225 | 579 | int_array_concat(¶ms.freqs, |
5be45e2e | 580 | tssid->scan_freq); |
d3a98225 JM |
581 | } else { |
582 | os_free(params.freqs); | |
583 | params.freqs = NULL; | |
584 | } | |
585 | freqs_set = 1; | |
586 | } | |
587 | int_array_sort_unique(params.freqs); | |
6fc6879b JM |
588 | } |
589 | ||
b3aa456b ES |
590 | if (ssid && max_ssids == 1) { |
591 | /* | |
592 | * If the driver is limited to 1 SSID at a time interleave | |
593 | * wildcard SSID scans with specific SSID scans to avoid | |
594 | * waiting a long time for a wildcard scan. | |
595 | */ | |
596 | if (!wpa_s->prev_scan_wildcard) { | |
597 | params.ssids[0].ssid = NULL; | |
598 | params.ssids[0].ssid_len = 0; | |
599 | wpa_s->prev_scan_wildcard = 1; | |
600 | wpa_dbg(wpa_s, MSG_DEBUG, "Starting AP scan for " | |
601 | "wildcard SSID (Interleave with specific)"); | |
602 | } else { | |
603 | wpa_s->prev_scan_ssid = ssid; | |
604 | wpa_s->prev_scan_wildcard = 0; | |
605 | wpa_dbg(wpa_s, MSG_DEBUG, | |
606 | "Starting AP scan for specific SSID: %s", | |
607 | wpa_ssid_txt(ssid->ssid, ssid->ssid_len)); | |
e76baaac | 608 | } |
b3aa456b ES |
609 | } else if (ssid) { |
610 | /* max_ssids > 1 */ | |
611 | ||
612 | wpa_s->prev_scan_ssid = ssid; | |
613 | wpa_dbg(wpa_s, MSG_DEBUG, "Include wildcard SSID in " | |
614 | "the scan request"); | |
615 | params.num_ssids++; | |
e76baaac | 616 | } else { |
ba2a573c | 617 | wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN; |
e76baaac | 618 | params.num_ssids++; |
f049052b BG |
619 | wpa_dbg(wpa_s, MSG_DEBUG, "Starting AP scan for wildcard " |
620 | "SSID"); | |
6fc6879b | 621 | } |
a21c05db JM |
622 | #ifdef CONFIG_P2P |
623 | ssid_list_set: | |
624 | #endif /* CONFIG_P2P */ | |
6fc6879b | 625 | |
5f738a21 | 626 | wpa_supplicant_optimize_freqs(wpa_s, ¶ms); |
46ee0427 | 627 | extra_ie = wpa_supplicant_extra_ies(wpa_s, ¶ms); |
0e65037c | 628 | |
f47d639d | 629 | if (params.freqs == NULL && wpa_s->next_scan_freqs) { |
f049052b BG |
630 | wpa_dbg(wpa_s, MSG_DEBUG, "Optimize scan based on previously " |
631 | "generated frequency list"); | |
f47d639d JM |
632 | params.freqs = wpa_s->next_scan_freqs; |
633 | } else | |
634 | os_free(wpa_s->next_scan_freqs); | |
635 | wpa_s->next_scan_freqs = NULL; | |
636 | ||
3812464c JM |
637 | params.filter_ssids = wpa_supplicant_build_filter_ssids( |
638 | wpa_s->conf, ¶ms.num_filter_ssids); | |
46ee0427 JM |
639 | if (extra_ie) { |
640 | params.extra_ies = wpabuf_head(extra_ie); | |
641 | params.extra_ies_len = wpabuf_len(extra_ie); | |
642 | } | |
3812464c | 643 | |
d1dd48e3 | 644 | #ifdef CONFIG_P2P |
85ea132a JM |
645 | if (wpa_s->p2p_in_provisioning || |
646 | (wpa_s->show_group_started && wpa_s->go_params)) { | |
d1dd48e3 JM |
647 | /* |
648 | * The interface may not yet be in P2P mode, so we have to | |
649 | * explicitly request P2P probe to disable CCK rates. | |
650 | */ | |
651 | params.p2p_probe = 1; | |
652 | } | |
653 | #endif /* CONFIG_P2P */ | |
654 | ||
60b94c98 | 655 | ret = wpa_supplicant_trigger_scan(wpa_s, ¶ms); |
6fc6879b | 656 | |
46ee0427 | 657 | wpabuf_free(extra_ie); |
d3a98225 | 658 | os_free(params.freqs); |
3812464c | 659 | os_free(params.filter_ssids); |
ad08c363 | 660 | |
6fc6879b | 661 | if (ret) { |
f049052b | 662 | wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate AP scan"); |
207ef3fb JM |
663 | if (prev_state != wpa_s->wpa_state) |
664 | wpa_supplicant_set_state(wpa_s, prev_state); | |
1c4c9c50 | 665 | wpa_supplicant_req_scan(wpa_s, 1, 0); |
d902a9c1 | 666 | } |
6fc6879b JM |
667 | } |
668 | ||
669 | ||
670 | /** | |
671 | * wpa_supplicant_req_scan - Schedule a scan for neighboring access points | |
672 | * @wpa_s: Pointer to wpa_supplicant data | |
673 | * @sec: Number of seconds after which to scan | |
674 | * @usec: Number of microseconds after which to scan | |
675 | * | |
676 | * This function is used to schedule a scan for neighboring access points after | |
677 | * the specified time. | |
678 | */ | |
679 | void wpa_supplicant_req_scan(struct wpa_supplicant *wpa_s, int sec, int usec) | |
680 | { | |
7e148849 DW |
681 | /* If there's at least one network that should be specifically scanned |
682 | * then don't cancel the scan and reschedule. Some drivers do | |
683 | * background scanning which generates frequent scan results, and that | |
684 | * causes the specific SSID scan to get continually pushed back and | |
685 | * never happen, which causes hidden APs to never get probe-scanned. | |
686 | */ | |
687 | if (eloop_is_timeout_registered(wpa_supplicant_scan, wpa_s, NULL) && | |
688 | wpa_s->conf->ap_scan == 1) { | |
689 | struct wpa_ssid *ssid = wpa_s->conf->ssid; | |
690 | ||
691 | while (ssid) { | |
fea7c3a0 | 692 | if (!wpas_network_disabled(ssid) && ssid->scan_ssid) |
7e148849 DW |
693 | break; |
694 | ssid = ssid->next; | |
695 | } | |
696 | if (ssid) { | |
f049052b | 697 | wpa_dbg(wpa_s, MSG_DEBUG, "Not rescheduling scan to " |
7e148849 DW |
698 | "ensure that specific SSID scans occur"); |
699 | return; | |
700 | } | |
701 | } | |
702 | ||
f049052b | 703 | wpa_dbg(wpa_s, MSG_DEBUG, "Setting scan request: %d sec %d usec", |
6fc6879b JM |
704 | sec, usec); |
705 | eloop_cancel_timeout(wpa_supplicant_scan, wpa_s, NULL); | |
706 | eloop_register_timeout(sec, usec, wpa_supplicant_scan, wpa_s, NULL); | |
707 | } | |
708 | ||
709 | ||
6a90053c LC |
710 | /** |
711 | * wpa_supplicant_delayed_sched_scan - Request a delayed scheduled scan | |
712 | * @wpa_s: Pointer to wpa_supplicant data | |
713 | * @sec: Number of seconds after which to scan | |
714 | * @usec: Number of microseconds after which to scan | |
715 | * | |
716 | * This function is used to schedule periodic scans for neighboring | |
717 | * access points after the specified time. | |
718 | */ | |
719 | int wpa_supplicant_delayed_sched_scan(struct wpa_supplicant *wpa_s, | |
720 | int sec, int usec) | |
721 | { | |
722 | if (!wpa_s->sched_scan_supported) | |
723 | return -1; | |
724 | ||
725 | eloop_register_timeout(sec, usec, | |
726 | wpa_supplicant_delayed_sched_scan_timeout, | |
727 | wpa_s, NULL); | |
728 | ||
729 | return 0; | |
730 | } | |
731 | ||
732 | ||
cbdf3507 LC |
733 | /** |
734 | * wpa_supplicant_req_sched_scan - Start a periodic scheduled scan | |
735 | * @wpa_s: Pointer to wpa_supplicant data | |
736 | * | |
737 | * This function is used to schedule periodic scans for neighboring | |
738 | * access points repeating the scan continuously. | |
739 | */ | |
740 | int wpa_supplicant_req_sched_scan(struct wpa_supplicant *wpa_s) | |
741 | { | |
742 | struct wpa_driver_scan_params params; | |
743 | enum wpa_states prev_state; | |
744 | struct wpa_ssid *ssid; | |
745 | struct wpabuf *wps_ie = NULL; | |
746 | int ret; | |
cbdf3507 | 747 | unsigned int max_sched_scan_ssids; |
76a5249e | 748 | int wildcard = 0; |
0b7a25c0 | 749 | int need_ssids; |
cbdf3507 LC |
750 | |
751 | if (!wpa_s->sched_scan_supported) | |
752 | return -1; | |
753 | ||
754 | if (wpa_s->max_sched_scan_ssids > WPAS_MAX_SCAN_SSIDS) | |
755 | max_sched_scan_ssids = WPAS_MAX_SCAN_SSIDS; | |
756 | else | |
757 | max_sched_scan_ssids = wpa_s->max_sched_scan_ssids; | |
54ddd743 | 758 | if (max_sched_scan_ssids < 1 || wpa_s->conf->disable_scan_offload) |
76a5249e | 759 | return -1; |
cbdf3507 | 760 | |
1966e3d1 ES |
761 | if (wpa_s->sched_scanning) { |
762 | wpa_dbg(wpa_s, MSG_DEBUG, "Already sched scanning"); | |
cbdf3507 | 763 | return 0; |
1966e3d1 | 764 | } |
cbdf3507 | 765 | |
0b7a25c0 JM |
766 | need_ssids = 0; |
767 | for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) { | |
fea7c3a0 | 768 | if (!wpas_network_disabled(ssid) && !ssid->scan_ssid) { |
0b7a25c0 JM |
769 | /* Use wildcard SSID to find this network */ |
770 | wildcard = 1; | |
fea7c3a0 | 771 | } else if (!wpas_network_disabled(ssid) && ssid->ssid_len) |
0b7a25c0 | 772 | need_ssids++; |
aa283ddd JM |
773 | |
774 | #ifdef CONFIG_WPS | |
fea7c3a0 JM |
775 | if (!wpas_network_disabled(ssid) && |
776 | ssid->key_mgmt == WPA_KEY_MGMT_WPS) { | |
aa283ddd JM |
777 | /* |
778 | * Normal scan is more reliable and faster for WPS | |
779 | * operations and since these are for short periods of | |
780 | * time, the benefit of trying to use sched_scan would | |
781 | * be limited. | |
782 | */ | |
783 | wpa_dbg(wpa_s, MSG_DEBUG, "Use normal scan instead of " | |
784 | "sched_scan for WPS"); | |
785 | return -1; | |
786 | } | |
787 | #endif /* CONFIG_WPS */ | |
0b7a25c0 JM |
788 | } |
789 | if (wildcard) | |
790 | need_ssids++; | |
791 | ||
792 | if (wpa_s->normal_scans < 3 && | |
793 | (need_ssids <= wpa_s->max_scan_ssids || | |
794 | wpa_s->max_scan_ssids >= (int) max_sched_scan_ssids)) { | |
795 | /* | |
796 | * When normal scan can speed up operations, use that for the | |
797 | * first operations before starting the sched_scan to allow | |
798 | * user space sleep more. We do this only if the normal scan | |
799 | * has functionality that is suitable for this or if the | |
800 | * sched_scan does not have better support for multiple SSIDs. | |
801 | */ | |
802 | wpa_dbg(wpa_s, MSG_DEBUG, "Use normal scan instead of " | |
803 | "sched_scan for initial scans (normal_scans=%d)", | |
804 | wpa_s->normal_scans); | |
805 | return -1; | |
806 | } | |
807 | ||
cbdf3507 LC |
808 | os_memset(¶ms, 0, sizeof(params)); |
809 | ||
b59e6f26 LC |
810 | /* If we can't allocate space for the filters, we just don't filter */ |
811 | params.filter_ssids = os_zalloc(wpa_s->max_match_sets * | |
812 | sizeof(struct wpa_driver_scan_filter)); | |
813 | ||
cbdf3507 LC |
814 | prev_state = wpa_s->wpa_state; |
815 | if (wpa_s->wpa_state == WPA_DISCONNECTED || | |
816 | wpa_s->wpa_state == WPA_INACTIVE) | |
817 | wpa_supplicant_set_state(wpa_s, WPA_SCANNING); | |
818 | ||
819 | /* Find the starting point from which to continue scanning */ | |
820 | ssid = wpa_s->conf->ssid; | |
821 | if (wpa_s->prev_sched_ssid) { | |
822 | while (ssid) { | |
823 | if (ssid == wpa_s->prev_sched_ssid) { | |
824 | ssid = ssid->next; | |
825 | break; | |
826 | } | |
827 | ssid = ssid->next; | |
828 | } | |
829 | } | |
830 | ||
831 | if (!ssid || !wpa_s->prev_sched_ssid) { | |
832 | wpa_dbg(wpa_s, MSG_DEBUG, "Beginning of SSID list"); | |
833 | ||
ea5bae47 | 834 | wpa_s->sched_scan_interval = 10; |
cbdf3507 LC |
835 | wpa_s->sched_scan_timeout = max_sched_scan_ssids * 2; |
836 | wpa_s->first_sched_scan = 1; | |
837 | ssid = wpa_s->conf->ssid; | |
838 | wpa_s->prev_sched_ssid = ssid; | |
839 | } | |
840 | ||
76a5249e JM |
841 | if (wildcard) { |
842 | wpa_dbg(wpa_s, MSG_DEBUG, "Add wildcard SSID to sched_scan"); | |
843 | params.num_ssids++; | |
844 | } | |
845 | ||
cbdf3507 | 846 | while (ssid) { |
fea7c3a0 | 847 | if (wpas_network_disabled(ssid)) |
5edddf41 | 848 | goto next; |
cbdf3507 | 849 | |
fcd16847 JM |
850 | if (params.num_filter_ssids < wpa_s->max_match_sets && |
851 | params.filter_ssids && ssid->ssid && ssid->ssid_len) { | |
1966e3d1 ES |
852 | wpa_dbg(wpa_s, MSG_DEBUG, "add to filter ssid: %s", |
853 | wpa_ssid_txt(ssid->ssid, ssid->ssid_len)); | |
b59e6f26 LC |
854 | os_memcpy(params.filter_ssids[params.num_filter_ssids].ssid, |
855 | ssid->ssid, ssid->ssid_len); | |
856 | params.filter_ssids[params.num_filter_ssids].ssid_len = | |
857 | ssid->ssid_len; | |
858 | params.num_filter_ssids++; | |
86b47aaf JM |
859 | } else if (params.filter_ssids && ssid->ssid && ssid->ssid_len) |
860 | { | |
861 | wpa_dbg(wpa_s, MSG_DEBUG, "Not enough room for SSID " | |
862 | "filter for sched_scan - drop filter"); | |
863 | os_free(params.filter_ssids); | |
864 | params.filter_ssids = NULL; | |
865 | params.num_filter_ssids = 0; | |
b59e6f26 LC |
866 | } |
867 | ||
3f56f3a4 | 868 | if (ssid->scan_ssid && ssid->ssid && ssid->ssid_len) { |
76a5249e JM |
869 | if (params.num_ssids == max_sched_scan_ssids) |
870 | break; /* only room for broadcast SSID */ | |
3f56f3a4 JM |
871 | wpa_dbg(wpa_s, MSG_DEBUG, |
872 | "add to active scan ssid: %s", | |
1966e3d1 | 873 | wpa_ssid_txt(ssid->ssid, ssid->ssid_len)); |
cbdf3507 LC |
874 | params.ssids[params.num_ssids].ssid = |
875 | ssid->ssid; | |
876 | params.ssids[params.num_ssids].ssid_len = | |
877 | ssid->ssid_len; | |
878 | params.num_ssids++; | |
b59e6f26 | 879 | if (params.num_ssids >= max_sched_scan_ssids) { |
cbdf3507 | 880 | wpa_s->prev_sched_ssid = ssid; |
b55aca46 JM |
881 | do { |
882 | ssid = ssid->next; | |
883 | } while (ssid && | |
fea7c3a0 JM |
884 | (wpas_network_disabled(ssid) || |
885 | !ssid->scan_ssid)); | |
cbdf3507 LC |
886 | break; |
887 | } | |
888 | } | |
b59e6f26 | 889 | |
5edddf41 | 890 | next: |
cbdf3507 LC |
891 | wpa_s->prev_sched_ssid = ssid; |
892 | ssid = ssid->next; | |
893 | } | |
894 | ||
7c6a266c JM |
895 | if (params.num_filter_ssids == 0) { |
896 | os_free(params.filter_ssids); | |
897 | params.filter_ssids = NULL; | |
898 | } | |
899 | ||
cbdf3507 LC |
900 | if (wpa_s->wps) |
901 | wps_ie = wpa_supplicant_extra_ies(wpa_s, ¶ms); | |
902 | ||
a8cb5a88 | 903 | if (ssid || !wpa_s->first_sched_scan) { |
a8cb5a88 JM |
904 | wpa_dbg(wpa_s, MSG_DEBUG, |
905 | "Starting sched scan: interval %d timeout %d", | |
906 | wpa_s->sched_scan_interval, wpa_s->sched_scan_timeout); | |
7d21a223 JM |
907 | } else { |
908 | wpa_dbg(wpa_s, MSG_DEBUG, | |
909 | "Starting sched scan: interval %d (no timeout)", | |
910 | wpa_s->sched_scan_interval); | |
a8cb5a88 | 911 | } |
cbdf3507 LC |
912 | |
913 | ret = wpa_supplicant_start_sched_scan(wpa_s, ¶ms, | |
914 | wpa_s->sched_scan_interval); | |
915 | wpabuf_free(wps_ie); | |
b59e6f26 | 916 | os_free(params.filter_ssids); |
cbdf3507 LC |
917 | if (ret) { |
918 | wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate sched scan"); | |
919 | if (prev_state != wpa_s->wpa_state) | |
920 | wpa_supplicant_set_state(wpa_s, prev_state); | |
921 | return ret; | |
922 | } | |
923 | ||
924 | /* If we have more SSIDs to scan, add a timeout so we scan them too */ | |
925 | if (ssid || !wpa_s->first_sched_scan) { | |
926 | wpa_s->sched_scan_timed_out = 0; | |
927 | eloop_register_timeout(wpa_s->sched_scan_timeout, 0, | |
928 | wpa_supplicant_sched_scan_timeout, | |
929 | wpa_s, NULL); | |
930 | wpa_s->first_sched_scan = 0; | |
931 | wpa_s->sched_scan_timeout /= 2; | |
932 | wpa_s->sched_scan_interval *= 2; | |
933 | } | |
934 | ||
935 | return 0; | |
936 | } | |
937 | ||
938 | ||
6fc6879b JM |
939 | /** |
940 | * wpa_supplicant_cancel_scan - Cancel a scheduled scan request | |
941 | * @wpa_s: Pointer to wpa_supplicant data | |
942 | * | |
943 | * This function is used to cancel a scan request scheduled with | |
944 | * wpa_supplicant_req_scan(). | |
945 | */ | |
946 | void wpa_supplicant_cancel_scan(struct wpa_supplicant *wpa_s) | |
947 | { | |
f049052b | 948 | wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling scan request"); |
6fc6879b JM |
949 | eloop_cancel_timeout(wpa_supplicant_scan, wpa_s, NULL); |
950 | } | |
cb8564b1 DW |
951 | |
952 | ||
cbdf3507 LC |
953 | /** |
954 | * wpa_supplicant_cancel_sched_scan - Stop running scheduled scans | |
955 | * @wpa_s: Pointer to wpa_supplicant data | |
956 | * | |
957 | * This function is used to stop a periodic scheduled scan. | |
958 | */ | |
959 | void wpa_supplicant_cancel_sched_scan(struct wpa_supplicant *wpa_s) | |
960 | { | |
961 | if (!wpa_s->sched_scanning) | |
962 | return; | |
963 | ||
964 | wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling sched scan"); | |
965 | eloop_cancel_timeout(wpa_supplicant_sched_scan_timeout, wpa_s, NULL); | |
966 | wpa_supplicant_stop_sched_scan(wpa_s); | |
967 | } | |
968 | ||
969 | ||
cb8564b1 DW |
970 | void wpa_supplicant_notify_scanning(struct wpa_supplicant *wpa_s, |
971 | int scanning) | |
972 | { | |
973 | if (wpa_s->scanning != scanning) { | |
974 | wpa_s->scanning = scanning; | |
8bac466b | 975 | wpas_notify_scanning(wpa_s); |
cb8564b1 DW |
976 | } |
977 | } | |
978 | ||
9ba9fa07 JM |
979 | |
980 | static int wpa_scan_get_max_rate(const struct wpa_scan_res *res) | |
981 | { | |
982 | int rate = 0; | |
983 | const u8 *ie; | |
984 | int i; | |
985 | ||
986 | ie = wpa_scan_get_ie(res, WLAN_EID_SUPP_RATES); | |
987 | for (i = 0; ie && i < ie[1]; i++) { | |
988 | if ((ie[i + 2] & 0x7f) > rate) | |
989 | rate = ie[i + 2] & 0x7f; | |
990 | } | |
991 | ||
992 | ie = wpa_scan_get_ie(res, WLAN_EID_EXT_SUPP_RATES); | |
993 | for (i = 0; ie && i < ie[1]; i++) { | |
994 | if ((ie[i + 2] & 0x7f) > rate) | |
995 | rate = ie[i + 2] & 0x7f; | |
996 | } | |
997 | ||
998 | return rate; | |
999 | } | |
1000 | ||
1001 | ||
d1f9c410 JM |
1002 | const u8 * wpa_scan_get_ie(const struct wpa_scan_res *res, u8 ie) |
1003 | { | |
1004 | const u8 *end, *pos; | |
1005 | ||
1006 | pos = (const u8 *) (res + 1); | |
1007 | end = pos + res->ie_len; | |
1008 | ||
1009 | while (pos + 1 < end) { | |
1010 | if (pos + 2 + pos[1] > end) | |
1011 | break; | |
1012 | if (pos[0] == ie) | |
1013 | return pos; | |
1014 | pos += 2 + pos[1]; | |
1015 | } | |
1016 | ||
1017 | return NULL; | |
1018 | } | |
1019 | ||
1020 | ||
9ba9fa07 JM |
1021 | const u8 * wpa_scan_get_vendor_ie(const struct wpa_scan_res *res, |
1022 | u32 vendor_type) | |
1023 | { | |
1024 | const u8 *end, *pos; | |
1025 | ||
1026 | pos = (const u8 *) (res + 1); | |
1027 | end = pos + res->ie_len; | |
1028 | ||
1029 | while (pos + 1 < end) { | |
1030 | if (pos + 2 + pos[1] > end) | |
1031 | break; | |
1032 | if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 && | |
1033 | vendor_type == WPA_GET_BE32(&pos[2])) | |
1034 | return pos; | |
1035 | pos += 2 + pos[1]; | |
1036 | } | |
1037 | ||
1038 | return NULL; | |
1039 | } | |
1040 | ||
1041 | ||
1042 | struct wpabuf * wpa_scan_get_vendor_ie_multi(const struct wpa_scan_res *res, | |
1043 | u32 vendor_type) | |
1044 | { | |
1045 | struct wpabuf *buf; | |
1046 | const u8 *end, *pos; | |
1047 | ||
1048 | buf = wpabuf_alloc(res->ie_len); | |
1049 | if (buf == NULL) | |
1050 | return NULL; | |
1051 | ||
1052 | pos = (const u8 *) (res + 1); | |
1053 | end = pos + res->ie_len; | |
1054 | ||
54f489be JM |
1055 | while (pos + 1 < end) { |
1056 | if (pos + 2 + pos[1] > end) | |
1057 | break; | |
1058 | if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 && | |
1059 | vendor_type == WPA_GET_BE32(&pos[2])) | |
1060 | wpabuf_put_data(buf, pos + 2 + 4, pos[1] - 4); | |
1061 | pos += 2 + pos[1]; | |
1062 | } | |
1063 | ||
1064 | if (wpabuf_len(buf) == 0) { | |
1065 | wpabuf_free(buf); | |
1066 | buf = NULL; | |
1067 | } | |
1068 | ||
1069 | return buf; | |
1070 | } | |
1071 | ||
1072 | ||
1073 | struct wpabuf * wpa_scan_get_vendor_ie_multi_beacon( | |
1074 | const struct wpa_scan_res *res, u32 vendor_type) | |
1075 | { | |
1076 | struct wpabuf *buf; | |
1077 | const u8 *end, *pos; | |
1078 | ||
1079 | if (res->beacon_ie_len == 0) | |
1080 | return NULL; | |
1081 | buf = wpabuf_alloc(res->beacon_ie_len); | |
1082 | if (buf == NULL) | |
1083 | return NULL; | |
1084 | ||
1085 | pos = (const u8 *) (res + 1); | |
1086 | pos += res->ie_len; | |
1087 | end = pos + res->beacon_ie_len; | |
1088 | ||
9ba9fa07 JM |
1089 | while (pos + 1 < end) { |
1090 | if (pos + 2 + pos[1] > end) | |
1091 | break; | |
1092 | if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 && | |
1093 | vendor_type == WPA_GET_BE32(&pos[2])) | |
1094 | wpabuf_put_data(buf, pos + 2 + 4, pos[1] - 4); | |
1095 | pos += 2 + pos[1]; | |
1096 | } | |
1097 | ||
1098 | if (wpabuf_len(buf) == 0) { | |
1099 | wpabuf_free(buf); | |
1100 | buf = NULL; | |
1101 | } | |
1102 | ||
1103 | return buf; | |
1104 | } | |
1105 | ||
1106 | ||
577db0ae GM |
1107 | /* |
1108 | * Channels with a great SNR can operate at full rate. What is a great SNR? | |
1109 | * This doc https://supportforums.cisco.com/docs/DOC-12954 says, "the general | |
1110 | * rule of thumb is that any SNR above 20 is good." This one | |
1111 | * http://www.cisco.com/en/US/tech/tk722/tk809/technologies_q_and_a_item09186a00805e9a96.shtml#qa23 | |
1112 | * recommends 25 as a minimum SNR for 54 Mbps data rate. 30 is chosen here as a | |
1113 | * conservative value. | |
1114 | */ | |
1115 | #define GREAT_SNR 30 | |
1116 | ||
9ba9fa07 JM |
1117 | /* Compare function for sorting scan results. Return >0 if @b is considered |
1118 | * better. */ | |
1119 | static int wpa_scan_result_compar(const void *a, const void *b) | |
1120 | { | |
577db0ae GM |
1121 | #define IS_5GHZ(n) (n > 4000) |
1122 | #define MIN(a,b) a < b ? a : b | |
9ba9fa07 JM |
1123 | struct wpa_scan_res **_wa = (void *) a; |
1124 | struct wpa_scan_res **_wb = (void *) b; | |
1125 | struct wpa_scan_res *wa = *_wa; | |
1126 | struct wpa_scan_res *wb = *_wb; | |
1127 | int wpa_a, wpa_b, maxrate_a, maxrate_b; | |
577db0ae | 1128 | int snr_a, snr_b; |
9ba9fa07 JM |
1129 | |
1130 | /* WPA/WPA2 support preferred */ | |
1131 | wpa_a = wpa_scan_get_vendor_ie(wa, WPA_IE_VENDOR_TYPE) != NULL || | |
1132 | wpa_scan_get_ie(wa, WLAN_EID_RSN) != NULL; | |
1133 | wpa_b = wpa_scan_get_vendor_ie(wb, WPA_IE_VENDOR_TYPE) != NULL || | |
1134 | wpa_scan_get_ie(wb, WLAN_EID_RSN) != NULL; | |
1135 | ||
1136 | if (wpa_b && !wpa_a) | |
1137 | return 1; | |
1138 | if (!wpa_b && wpa_a) | |
1139 | return -1; | |
1140 | ||
1141 | /* privacy support preferred */ | |
1142 | if ((wa->caps & IEEE80211_CAP_PRIVACY) == 0 && | |
1143 | (wb->caps & IEEE80211_CAP_PRIVACY)) | |
1144 | return 1; | |
1145 | if ((wa->caps & IEEE80211_CAP_PRIVACY) && | |
1146 | (wb->caps & IEEE80211_CAP_PRIVACY) == 0) | |
1147 | return -1; | |
1148 | ||
577db0ae GM |
1149 | if ((wa->flags & wb->flags & WPA_SCAN_LEVEL_DBM) && |
1150 | !((wa->flags | wb->flags) & WPA_SCAN_NOISE_INVALID)) { | |
1151 | snr_a = MIN(wa->level - wa->noise, GREAT_SNR); | |
1152 | snr_b = MIN(wb->level - wb->noise, GREAT_SNR); | |
1153 | } else { | |
1154 | /* Not suitable information to calculate SNR, so use level */ | |
1155 | snr_a = wa->level; | |
1156 | snr_b = wb->level; | |
1157 | } | |
1158 | ||
577db0ae GM |
1159 | /* best/max rate preferred if SNR close enough */ |
1160 | if ((snr_a && snr_b && abs(snr_b - snr_a) < 5) || | |
9ba9fa07 JM |
1161 | (wa->qual && wb->qual && abs(wb->qual - wa->qual) < 10)) { |
1162 | maxrate_a = wpa_scan_get_max_rate(wa); | |
1163 | maxrate_b = wpa_scan_get_max_rate(wb); | |
1164 | if (maxrate_a != maxrate_b) | |
1165 | return maxrate_b - maxrate_a; | |
577db0ae GM |
1166 | if (IS_5GHZ(wa->freq) ^ IS_5GHZ(wb->freq)) |
1167 | return IS_5GHZ(wa->freq) ? -1 : 1; | |
9ba9fa07 JM |
1168 | } |
1169 | ||
1170 | /* use freq for channel preference */ | |
1171 | ||
577db0ae | 1172 | /* all things being equal, use SNR; if SNRs are |
9ba9fa07 JM |
1173 | * identical, use quality values since some drivers may only report |
1174 | * that value and leave the signal level zero */ | |
577db0ae | 1175 | if (snr_b == snr_a) |
9ba9fa07 | 1176 | return wb->qual - wa->qual; |
577db0ae GM |
1177 | return snr_b - snr_a; |
1178 | #undef MIN | |
1179 | #undef IS_5GHZ | |
9ba9fa07 JM |
1180 | } |
1181 | ||
1182 | ||
41e650ae JM |
1183 | #ifdef CONFIG_WPS |
1184 | /* Compare function for sorting scan results when searching a WPS AP for | |
1185 | * provisioning. Return >0 if @b is considered better. */ | |
1186 | static int wpa_scan_result_wps_compar(const void *a, const void *b) | |
1187 | { | |
1188 | struct wpa_scan_res **_wa = (void *) a; | |
1189 | struct wpa_scan_res **_wb = (void *) b; | |
1190 | struct wpa_scan_res *wa = *_wa; | |
1191 | struct wpa_scan_res *wb = *_wb; | |
1192 | int uses_wps_a, uses_wps_b; | |
1193 | struct wpabuf *wps_a, *wps_b; | |
1194 | int res; | |
1195 | ||
1196 | /* Optimization - check WPS IE existence before allocated memory and | |
1197 | * doing full reassembly. */ | |
1198 | uses_wps_a = wpa_scan_get_vendor_ie(wa, WPS_IE_VENDOR_TYPE) != NULL; | |
1199 | uses_wps_b = wpa_scan_get_vendor_ie(wb, WPS_IE_VENDOR_TYPE) != NULL; | |
1200 | if (uses_wps_a && !uses_wps_b) | |
1201 | return -1; | |
1202 | if (!uses_wps_a && uses_wps_b) | |
1203 | return 1; | |
1204 | ||
1205 | if (uses_wps_a && uses_wps_b) { | |
1206 | wps_a = wpa_scan_get_vendor_ie_multi(wa, WPS_IE_VENDOR_TYPE); | |
1207 | wps_b = wpa_scan_get_vendor_ie_multi(wb, WPS_IE_VENDOR_TYPE); | |
1208 | res = wps_ap_priority_compar(wps_a, wps_b); | |
1209 | wpabuf_free(wps_a); | |
1210 | wpabuf_free(wps_b); | |
1211 | if (res) | |
1212 | return res; | |
1213 | } | |
1214 | ||
1215 | /* | |
1216 | * Do not use current AP security policy as a sorting criteria during | |
1217 | * WPS provisioning step since the AP may get reconfigured at the | |
1218 | * completion of provisioning. | |
1219 | */ | |
1220 | ||
1221 | /* all things being equal, use signal level; if signal levels are | |
1222 | * identical, use quality values since some drivers may only report | |
1223 | * that value and leave the signal level zero */ | |
1224 | if (wb->level == wa->level) | |
1225 | return wb->qual - wa->qual; | |
1226 | return wb->level - wa->level; | |
1227 | } | |
1228 | #endif /* CONFIG_WPS */ | |
1229 | ||
1230 | ||
aa820e02 JM |
1231 | static void dump_scan_res(struct wpa_scan_results *scan_res) |
1232 | { | |
76202aed | 1233 | #ifndef CONFIG_NO_STDOUT_DEBUG |
aa820e02 JM |
1234 | size_t i; |
1235 | ||
1236 | if (scan_res->res == NULL || scan_res->num == 0) | |
1237 | return; | |
1238 | ||
1239 | wpa_printf(MSG_EXCESSIVE, "Sorted scan results"); | |
1240 | ||
1241 | for (i = 0; i < scan_res->num; i++) { | |
1242 | struct wpa_scan_res *r = scan_res->res[i]; | |
1243 | if ((r->flags & (WPA_SCAN_LEVEL_DBM | WPA_SCAN_NOISE_INVALID)) | |
1244 | == WPA_SCAN_LEVEL_DBM) { | |
1245 | int snr = r->level - r->noise; | |
1246 | wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d " | |
1247 | "noise=%d level=%d snr=%d%s flags=0x%x", | |
1248 | MAC2STR(r->bssid), r->freq, r->qual, | |
1249 | r->noise, r->level, snr, | |
1250 | snr >= GREAT_SNR ? "*" : "", r->flags); | |
1251 | } else { | |
1252 | wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d " | |
1253 | "noise=%d level=%d flags=0x%x", | |
1254 | MAC2STR(r->bssid), r->freq, r->qual, | |
1255 | r->noise, r->level, r->flags); | |
1256 | } | |
1257 | } | |
76202aed | 1258 | #endif /* CONFIG_NO_STDOUT_DEBUG */ |
aa820e02 JM |
1259 | } |
1260 | ||
1261 | ||
d445a5cd JM |
1262 | int wpa_supplicant_filter_bssid_match(struct wpa_supplicant *wpa_s, |
1263 | const u8 *bssid) | |
1264 | { | |
1265 | size_t i; | |
1266 | ||
1267 | if (wpa_s->bssid_filter == NULL) | |
1268 | return 1; | |
1269 | ||
1270 | for (i = 0; i < wpa_s->bssid_filter_count; i++) { | |
1271 | if (os_memcmp(wpa_s->bssid_filter + i * ETH_ALEN, bssid, | |
1272 | ETH_ALEN) == 0) | |
1273 | return 1; | |
1274 | } | |
1275 | ||
1276 | return 0; | |
1277 | } | |
1278 | ||
1279 | ||
1280 | static void filter_scan_res(struct wpa_supplicant *wpa_s, | |
1281 | struct wpa_scan_results *res) | |
1282 | { | |
1283 | size_t i, j; | |
1284 | ||
1285 | if (wpa_s->bssid_filter == NULL) | |
1286 | return; | |
1287 | ||
1288 | for (i = 0, j = 0; i < res->num; i++) { | |
1289 | if (wpa_supplicant_filter_bssid_match(wpa_s, | |
1290 | res->res[i]->bssid)) { | |
1291 | res->res[j++] = res->res[i]; | |
1292 | } else { | |
1293 | os_free(res->res[i]); | |
1294 | res->res[i] = NULL; | |
1295 | } | |
1296 | } | |
1297 | ||
1298 | if (res->num != j) { | |
1299 | wpa_printf(MSG_DEBUG, "Filtered out %d scan results", | |
1300 | (int) (res->num - j)); | |
1301 | res->num = j; | |
1302 | } | |
1303 | } | |
1304 | ||
1305 | ||
9ba9fa07 JM |
1306 | /** |
1307 | * wpa_supplicant_get_scan_results - Get scan results | |
1308 | * @wpa_s: Pointer to wpa_supplicant data | |
1309 | * @info: Information about what was scanned or %NULL if not available | |
1310 | * @new_scan: Whether a new scan was performed | |
1311 | * Returns: Scan results, %NULL on failure | |
1312 | * | |
1313 | * This function request the current scan results from the driver and updates | |
1314 | * the local BSS list wpa_s->bss. The caller is responsible for freeing the | |
1315 | * results with wpa_scan_results_free(). | |
1316 | */ | |
1317 | struct wpa_scan_results * | |
1318 | wpa_supplicant_get_scan_results(struct wpa_supplicant *wpa_s, | |
1319 | struct scan_info *info, int new_scan) | |
1320 | { | |
1321 | struct wpa_scan_results *scan_res; | |
1322 | size_t i; | |
41e650ae | 1323 | int (*compar)(const void *, const void *) = wpa_scan_result_compar; |
9ba9fa07 | 1324 | |
17fbb751 | 1325 | scan_res = wpa_drv_get_scan_results2(wpa_s); |
9ba9fa07 | 1326 | if (scan_res == NULL) { |
f049052b | 1327 | wpa_dbg(wpa_s, MSG_DEBUG, "Failed to get scan results"); |
9ba9fa07 JM |
1328 | return NULL; |
1329 | } | |
d445a5cd | 1330 | filter_scan_res(wpa_s, scan_res); |
9ba9fa07 | 1331 | |
41e650ae JM |
1332 | #ifdef CONFIG_WPS |
1333 | if (wpas_wps_in_progress(wpa_s)) { | |
f049052b BG |
1334 | wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Order scan results with WPS " |
1335 | "provisioning rules"); | |
41e650ae JM |
1336 | compar = wpa_scan_result_wps_compar; |
1337 | } | |
1338 | #endif /* CONFIG_WPS */ | |
1339 | ||
9ba9fa07 | 1340 | qsort(scan_res->res, scan_res->num, sizeof(struct wpa_scan_res *), |
41e650ae | 1341 | compar); |
aa820e02 | 1342 | dump_scan_res(scan_res); |
9ba9fa07 JM |
1343 | |
1344 | wpa_bss_update_start(wpa_s); | |
1345 | for (i = 0; i < scan_res->num; i++) | |
1346 | wpa_bss_update_scan_res(wpa_s, scan_res->res[i]); | |
1347 | wpa_bss_update_end(wpa_s, info, new_scan); | |
1348 | ||
1349 | return scan_res; | |
1350 | } | |
1351 | ||
1352 | ||
1353 | int wpa_supplicant_update_scan_results(struct wpa_supplicant *wpa_s) | |
1354 | { | |
1355 | struct wpa_scan_results *scan_res; | |
1356 | scan_res = wpa_supplicant_get_scan_results(wpa_s, NULL, 0); | |
1357 | if (scan_res == NULL) | |
1358 | return -1; | |
1359 | wpa_scan_results_free(scan_res); | |
1360 | ||
1361 | return 0; | |
1362 | } |