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1 | /* | |
2 | * BSS table | |
3 | * Copyright (c) 2009-2010, Jouni Malinen <j@w1.fi> | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License version 2 as | |
7 | * published by the Free Software Foundation. | |
8 | * | |
9 | * Alternatively, this software may be distributed under the terms of BSD | |
10 | * license. | |
11 | * | |
12 | * See README and COPYING for more details. | |
13 | */ | |
14 | ||
15 | #include "utils/includes.h" | |
16 | ||
17 | #include "utils/common.h" | |
18 | #include "utils/eloop.h" | |
19 | #include "common/ieee802_11_defs.h" | |
20 | #include "drivers/driver.h" | |
21 | #include "wpa_supplicant_i.h" | |
22 | #include "config.h" | |
23 | #include "notify.h" | |
24 | #include "scan.h" | |
25 | #include "bss.h" | |
26 | ||
27 | ||
28 | /** | |
29 | * WPA_BSS_EXPIRATION_PERIOD - Period of expiration run in seconds | |
30 | */ | |
31 | #define WPA_BSS_EXPIRATION_PERIOD 10 | |
32 | ||
33 | #define WPA_BSS_FREQ_CHANGED_FLAG BIT(0) | |
34 | #define WPA_BSS_SIGNAL_CHANGED_FLAG BIT(1) | |
35 | #define WPA_BSS_PRIVACY_CHANGED_FLAG BIT(2) | |
36 | #define WPA_BSS_MODE_CHANGED_FLAG BIT(3) | |
37 | #define WPA_BSS_WPAIE_CHANGED_FLAG BIT(4) | |
38 | #define WPA_BSS_RSNIE_CHANGED_FLAG BIT(5) | |
39 | #define WPA_BSS_WPS_CHANGED_FLAG BIT(6) | |
40 | #define WPA_BSS_RATES_CHANGED_FLAG BIT(7) | |
41 | #define WPA_BSS_IES_CHANGED_FLAG BIT(8) | |
42 | ||
43 | ||
44 | static void wpa_bss_remove(struct wpa_supplicant *wpa_s, struct wpa_bss *bss) | |
45 | { | |
46 | dl_list_del(&bss->list); | |
47 | dl_list_del(&bss->list_id); | |
48 | wpa_s->num_bss--; | |
49 | wpa_dbg(wpa_s, MSG_DEBUG, "BSS: Remove id %u BSSID " MACSTR | |
50 | " SSID '%s'", bss->id, MAC2STR(bss->bssid), | |
51 | wpa_ssid_txt(bss->ssid, bss->ssid_len)); | |
52 | wpas_notify_bss_removed(wpa_s, bss->bssid, bss->id); | |
53 | #ifdef CONFIG_INTERWORKING | |
54 | wpabuf_free(bss->anqp_venue_name); | |
55 | wpabuf_free(bss->anqp_network_auth_type); | |
56 | wpabuf_free(bss->anqp_roaming_consortium); | |
57 | wpabuf_free(bss->anqp_ip_addr_type_availability); | |
58 | wpabuf_free(bss->anqp_nai_realm); | |
59 | wpabuf_free(bss->anqp_3gpp); | |
60 | wpabuf_free(bss->anqp_domain_name); | |
61 | #endif /* CONFIG_INTERWORKING */ | |
62 | os_free(bss); | |
63 | } | |
64 | ||
65 | ||
66 | struct wpa_bss * wpa_bss_get(struct wpa_supplicant *wpa_s, const u8 *bssid, | |
67 | const u8 *ssid, size_t ssid_len) | |
68 | { | |
69 | struct wpa_bss *bss; | |
70 | dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list) { | |
71 | if (os_memcmp(bss->bssid, bssid, ETH_ALEN) == 0 && | |
72 | bss->ssid_len == ssid_len && | |
73 | os_memcmp(bss->ssid, ssid, ssid_len) == 0) | |
74 | return bss; | |
75 | } | |
76 | return NULL; | |
77 | } | |
78 | ||
79 | ||
80 | static void wpa_bss_copy_res(struct wpa_bss *dst, struct wpa_scan_res *src) | |
81 | { | |
82 | os_time_t usec; | |
83 | ||
84 | dst->flags = src->flags; | |
85 | os_memcpy(dst->bssid, src->bssid, ETH_ALEN); | |
86 | dst->freq = src->freq; | |
87 | dst->beacon_int = src->beacon_int; | |
88 | dst->caps = src->caps; | |
89 | dst->qual = src->qual; | |
90 | dst->noise = src->noise; | |
91 | dst->level = src->level; | |
92 | dst->tsf = src->tsf; | |
93 | ||
94 | os_get_time(&dst->last_update); | |
95 | dst->last_update.sec -= src->age / 1000; | |
96 | usec = (src->age % 1000) * 1000; | |
97 | if (dst->last_update.usec < usec) { | |
98 | dst->last_update.sec--; | |
99 | dst->last_update.usec += 1000000; | |
100 | } | |
101 | dst->last_update.usec -= usec; | |
102 | } | |
103 | ||
104 | ||
105 | static int wpa_bss_known(struct wpa_supplicant *wpa_s, struct wpa_bss *bss) | |
106 | { | |
107 | struct wpa_ssid *ssid; | |
108 | ||
109 | for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) { | |
110 | if (ssid->ssid == NULL || ssid->ssid_len == 0) | |
111 | continue; | |
112 | if (ssid->ssid_len == bss->ssid_len && | |
113 | os_memcmp(ssid->ssid, bss->ssid, ssid->ssid_len) == 0) | |
114 | return 1; | |
115 | } | |
116 | ||
117 | return 0; | |
118 | } | |
119 | ||
120 | ||
121 | static int wpa_bss_remove_oldest_unknown(struct wpa_supplicant *wpa_s) | |
122 | { | |
123 | struct wpa_bss *bss; | |
124 | ||
125 | dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list) { | |
126 | if (!wpa_bss_known(wpa_s, bss)) { | |
127 | wpa_bss_remove(wpa_s, bss); | |
128 | return 0; | |
129 | } | |
130 | } | |
131 | ||
132 | return -1; | |
133 | } | |
134 | ||
135 | ||
136 | static void wpa_bss_remove_oldest(struct wpa_supplicant *wpa_s) | |
137 | { | |
138 | /* | |
139 | * Remove the oldest entry that does not match with any configured | |
140 | * network. | |
141 | */ | |
142 | if (wpa_bss_remove_oldest_unknown(wpa_s) == 0) | |
143 | return; | |
144 | ||
145 | /* | |
146 | * Remove the oldest entry since no better candidate for removal was | |
147 | * found. | |
148 | */ | |
149 | wpa_bss_remove(wpa_s, dl_list_first(&wpa_s->bss, | |
150 | struct wpa_bss, list)); | |
151 | } | |
152 | ||
153 | ||
154 | static void wpa_bss_add(struct wpa_supplicant *wpa_s, | |
155 | const u8 *ssid, size_t ssid_len, | |
156 | struct wpa_scan_res *res) | |
157 | { | |
158 | struct wpa_bss *bss; | |
159 | ||
160 | bss = os_zalloc(sizeof(*bss) + res->ie_len + res->beacon_ie_len); | |
161 | if (bss == NULL) | |
162 | return; | |
163 | bss->id = wpa_s->bss_next_id++; | |
164 | bss->last_update_idx = wpa_s->bss_update_idx; | |
165 | wpa_bss_copy_res(bss, res); | |
166 | os_memcpy(bss->ssid, ssid, ssid_len); | |
167 | bss->ssid_len = ssid_len; | |
168 | bss->ie_len = res->ie_len; | |
169 | bss->beacon_ie_len = res->beacon_ie_len; | |
170 | os_memcpy(bss + 1, res + 1, res->ie_len + res->beacon_ie_len); | |
171 | ||
172 | dl_list_add_tail(&wpa_s->bss, &bss->list); | |
173 | dl_list_add_tail(&wpa_s->bss_id, &bss->list_id); | |
174 | wpa_s->num_bss++; | |
175 | wpa_dbg(wpa_s, MSG_DEBUG, "BSS: Add new id %u BSSID " MACSTR | |
176 | " SSID '%s'", | |
177 | bss->id, MAC2STR(bss->bssid), wpa_ssid_txt(ssid, ssid_len)); | |
178 | wpas_notify_bss_added(wpa_s, bss->bssid, bss->id); | |
179 | if (wpa_s->num_bss > wpa_s->conf->bss_max_count) | |
180 | wpa_bss_remove_oldest(wpa_s); | |
181 | } | |
182 | ||
183 | ||
184 | static int are_ies_equal(const struct wpa_bss *old, | |
185 | const struct wpa_scan_res *new, u32 ie) | |
186 | { | |
187 | const u8 *old_ie, *new_ie; | |
188 | struct wpabuf *old_ie_buff = NULL; | |
189 | struct wpabuf *new_ie_buff = NULL; | |
190 | int new_ie_len, old_ie_len, ret, is_multi; | |
191 | ||
192 | switch (ie) { | |
193 | case WPA_IE_VENDOR_TYPE: | |
194 | old_ie = wpa_bss_get_vendor_ie(old, ie); | |
195 | new_ie = wpa_scan_get_vendor_ie(new, ie); | |
196 | is_multi = 0; | |
197 | break; | |
198 | case WPS_IE_VENDOR_TYPE: | |
199 | old_ie_buff = wpa_bss_get_vendor_ie_multi(old, ie); | |
200 | new_ie_buff = wpa_scan_get_vendor_ie_multi(new, ie); | |
201 | is_multi = 1; | |
202 | break; | |
203 | case WLAN_EID_RSN: | |
204 | case WLAN_EID_SUPP_RATES: | |
205 | case WLAN_EID_EXT_SUPP_RATES: | |
206 | old_ie = wpa_bss_get_ie(old, ie); | |
207 | new_ie = wpa_scan_get_ie(new, ie); | |
208 | is_multi = 0; | |
209 | break; | |
210 | default: | |
211 | wpa_printf(MSG_DEBUG, "bss: %s: cannot compare IEs", __func__); | |
212 | return 0; | |
213 | } | |
214 | ||
215 | if (is_multi) { | |
216 | /* in case of multiple IEs stored in buffer */ | |
217 | old_ie = old_ie_buff ? wpabuf_head_u8(old_ie_buff) : NULL; | |
218 | new_ie = new_ie_buff ? wpabuf_head_u8(new_ie_buff) : NULL; | |
219 | old_ie_len = old_ie_buff ? wpabuf_len(old_ie_buff) : 0; | |
220 | new_ie_len = new_ie_buff ? wpabuf_len(new_ie_buff) : 0; | |
221 | } else { | |
222 | /* in case of single IE */ | |
223 | old_ie_len = old_ie ? old_ie[1] + 2 : 0; | |
224 | new_ie_len = new_ie ? new_ie[1] + 2 : 0; | |
225 | } | |
226 | ||
227 | if (!old_ie || !new_ie) | |
228 | ret = !old_ie && !new_ie; | |
229 | else | |
230 | ret = (old_ie_len == new_ie_len && | |
231 | os_memcmp(old_ie, new_ie, old_ie_len) == 0); | |
232 | ||
233 | wpabuf_free(old_ie_buff); | |
234 | wpabuf_free(new_ie_buff); | |
235 | ||
236 | return ret; | |
237 | } | |
238 | ||
239 | ||
240 | static u32 wpa_bss_compare_res(const struct wpa_bss *old, | |
241 | const struct wpa_scan_res *new) | |
242 | { | |
243 | u32 changes = 0; | |
244 | int caps_diff = old->caps ^ new->caps; | |
245 | ||
246 | if (old->freq != new->freq) | |
247 | changes |= WPA_BSS_FREQ_CHANGED_FLAG; | |
248 | ||
249 | if (old->level != new->level) | |
250 | changes |= WPA_BSS_SIGNAL_CHANGED_FLAG; | |
251 | ||
252 | if (caps_diff & IEEE80211_CAP_PRIVACY) | |
253 | changes |= WPA_BSS_PRIVACY_CHANGED_FLAG; | |
254 | ||
255 | if (caps_diff & IEEE80211_CAP_IBSS) | |
256 | changes |= WPA_BSS_MODE_CHANGED_FLAG; | |
257 | ||
258 | if (old->ie_len == new->ie_len && | |
259 | os_memcmp(old + 1, new + 1, old->ie_len) == 0) | |
260 | return changes; | |
261 | changes |= WPA_BSS_IES_CHANGED_FLAG; | |
262 | ||
263 | if (!are_ies_equal(old, new, WPA_IE_VENDOR_TYPE)) | |
264 | changes |= WPA_BSS_WPAIE_CHANGED_FLAG; | |
265 | ||
266 | if (!are_ies_equal(old, new, WLAN_EID_RSN)) | |
267 | changes |= WPA_BSS_RSNIE_CHANGED_FLAG; | |
268 | ||
269 | if (!are_ies_equal(old, new, WPS_IE_VENDOR_TYPE)) | |
270 | changes |= WPA_BSS_WPS_CHANGED_FLAG; | |
271 | ||
272 | if (!are_ies_equal(old, new, WLAN_EID_SUPP_RATES) || | |
273 | !are_ies_equal(old, new, WLAN_EID_EXT_SUPP_RATES)) | |
274 | changes |= WPA_BSS_RATES_CHANGED_FLAG; | |
275 | ||
276 | return changes; | |
277 | } | |
278 | ||
279 | ||
280 | static void notify_bss_changes(struct wpa_supplicant *wpa_s, u32 changes, | |
281 | const struct wpa_bss *bss) | |
282 | { | |
283 | if (changes & WPA_BSS_FREQ_CHANGED_FLAG) | |
284 | wpas_notify_bss_freq_changed(wpa_s, bss->id); | |
285 | ||
286 | if (changes & WPA_BSS_SIGNAL_CHANGED_FLAG) | |
287 | wpas_notify_bss_signal_changed(wpa_s, bss->id); | |
288 | ||
289 | if (changes & WPA_BSS_PRIVACY_CHANGED_FLAG) | |
290 | wpas_notify_bss_privacy_changed(wpa_s, bss->id); | |
291 | ||
292 | if (changes & WPA_BSS_MODE_CHANGED_FLAG) | |
293 | wpas_notify_bss_mode_changed(wpa_s, bss->id); | |
294 | ||
295 | if (changes & WPA_BSS_WPAIE_CHANGED_FLAG) | |
296 | wpas_notify_bss_wpaie_changed(wpa_s, bss->id); | |
297 | ||
298 | if (changes & WPA_BSS_RSNIE_CHANGED_FLAG) | |
299 | wpas_notify_bss_rsnie_changed(wpa_s, bss->id); | |
300 | ||
301 | if (changes & WPA_BSS_WPS_CHANGED_FLAG) | |
302 | wpas_notify_bss_wps_changed(wpa_s, bss->id); | |
303 | ||
304 | if (changes & WPA_BSS_IES_CHANGED_FLAG) | |
305 | wpas_notify_bss_ies_changed(wpa_s, bss->id); | |
306 | ||
307 | if (changes & WPA_BSS_RATES_CHANGED_FLAG) | |
308 | wpas_notify_bss_rates_changed(wpa_s, bss->id); | |
309 | } | |
310 | ||
311 | ||
312 | static void wpa_bss_update(struct wpa_supplicant *wpa_s, struct wpa_bss *bss, | |
313 | struct wpa_scan_res *res) | |
314 | { | |
315 | u32 changes; | |
316 | ||
317 | changes = wpa_bss_compare_res(bss, res); | |
318 | bss->scan_miss_count = 0; | |
319 | bss->last_update_idx = wpa_s->bss_update_idx; | |
320 | wpa_bss_copy_res(bss, res); | |
321 | /* Move the entry to the end of the list */ | |
322 | dl_list_del(&bss->list); | |
323 | if (bss->ie_len + bss->beacon_ie_len >= | |
324 | res->ie_len + res->beacon_ie_len) { | |
325 | os_memcpy(bss + 1, res + 1, res->ie_len + res->beacon_ie_len); | |
326 | bss->ie_len = res->ie_len; | |
327 | bss->beacon_ie_len = res->beacon_ie_len; | |
328 | } else { | |
329 | struct wpa_bss *nbss; | |
330 | struct dl_list *prev = bss->list_id.prev; | |
331 | dl_list_del(&bss->list_id); | |
332 | nbss = os_realloc(bss, sizeof(*bss) + res->ie_len + | |
333 | res->beacon_ie_len); | |
334 | if (nbss) { | |
335 | bss = nbss; | |
336 | os_memcpy(bss + 1, res + 1, | |
337 | res->ie_len + res->beacon_ie_len); | |
338 | bss->ie_len = res->ie_len; | |
339 | bss->beacon_ie_len = res->beacon_ie_len; | |
340 | } | |
341 | dl_list_add(prev, &bss->list_id); | |
342 | } | |
343 | dl_list_add_tail(&wpa_s->bss, &bss->list); | |
344 | ||
345 | notify_bss_changes(wpa_s, changes, bss); | |
346 | } | |
347 | ||
348 | ||
349 | static int wpa_bss_in_use(struct wpa_supplicant *wpa_s, struct wpa_bss *bss) | |
350 | { | |
351 | return bss == wpa_s->current_bss || | |
352 | os_memcmp(bss->bssid, wpa_s->bssid, ETH_ALEN) == 0 || | |
353 | os_memcmp(bss->bssid, wpa_s->pending_bssid, ETH_ALEN) == 0; | |
354 | } | |
355 | ||
356 | ||
357 | void wpa_bss_update_start(struct wpa_supplicant *wpa_s) | |
358 | { | |
359 | wpa_s->bss_update_idx++; | |
360 | wpa_dbg(wpa_s, MSG_DEBUG, "BSS: Start scan result update %u", | |
361 | wpa_s->bss_update_idx); | |
362 | } | |
363 | ||
364 | ||
365 | void wpa_bss_update_scan_res(struct wpa_supplicant *wpa_s, | |
366 | struct wpa_scan_res *res) | |
367 | { | |
368 | const u8 *ssid, *p2p; | |
369 | struct wpa_bss *bss; | |
370 | ||
371 | ssid = wpa_scan_get_ie(res, WLAN_EID_SSID); | |
372 | if (ssid == NULL) { | |
373 | wpa_dbg(wpa_s, MSG_DEBUG, "BSS: No SSID IE included for " | |
374 | MACSTR, MAC2STR(res->bssid)); | |
375 | return; | |
376 | } | |
377 | if (ssid[1] > 32) { | |
378 | wpa_dbg(wpa_s, MSG_DEBUG, "BSS: Too long SSID IE included for " | |
379 | MACSTR, MAC2STR(res->bssid)); | |
380 | return; | |
381 | } | |
382 | ||
383 | p2p = wpa_scan_get_vendor_ie(res, P2P_IE_VENDOR_TYPE); | |
384 | if (p2p && ssid[1] == P2P_WILDCARD_SSID_LEN && | |
385 | os_memcmp(ssid + 2, P2P_WILDCARD_SSID, P2P_WILDCARD_SSID_LEN) == 0) | |
386 | return; /* Skip P2P listen discovery results here */ | |
387 | ||
388 | /* TODO: add option for ignoring BSSes we are not interested in | |
389 | * (to save memory) */ | |
390 | bss = wpa_bss_get(wpa_s, res->bssid, ssid + 2, ssid[1]); | |
391 | if (bss == NULL) | |
392 | wpa_bss_add(wpa_s, ssid + 2, ssid[1], res); | |
393 | else | |
394 | wpa_bss_update(wpa_s, bss, res); | |
395 | } | |
396 | ||
397 | ||
398 | static int wpa_bss_included_in_scan(const struct wpa_bss *bss, | |
399 | const struct scan_info *info) | |
400 | { | |
401 | int found; | |
402 | size_t i; | |
403 | ||
404 | if (info == NULL) | |
405 | return 1; | |
406 | ||
407 | if (info->num_freqs) { | |
408 | found = 0; | |
409 | for (i = 0; i < info->num_freqs; i++) { | |
410 | if (bss->freq == info->freqs[i]) { | |
411 | found = 1; | |
412 | break; | |
413 | } | |
414 | } | |
415 | if (!found) | |
416 | return 0; | |
417 | } | |
418 | ||
419 | if (info->num_ssids) { | |
420 | found = 0; | |
421 | for (i = 0; i < info->num_ssids; i++) { | |
422 | const struct wpa_driver_scan_ssid *s = &info->ssids[i]; | |
423 | if ((s->ssid == NULL || s->ssid_len == 0) || | |
424 | (s->ssid_len == bss->ssid_len && | |
425 | os_memcmp(s->ssid, bss->ssid, bss->ssid_len) == | |
426 | 0)) { | |
427 | found = 1; | |
428 | break; | |
429 | } | |
430 | } | |
431 | if (!found) | |
432 | return 0; | |
433 | } | |
434 | ||
435 | return 1; | |
436 | } | |
437 | ||
438 | ||
439 | void wpa_bss_update_end(struct wpa_supplicant *wpa_s, struct scan_info *info, | |
440 | int new_scan) | |
441 | { | |
442 | struct wpa_bss *bss, *n; | |
443 | ||
444 | if (!new_scan) | |
445 | return; /* do not expire entries without new scan */ | |
446 | ||
447 | dl_list_for_each_safe(bss, n, &wpa_s->bss, struct wpa_bss, list) { | |
448 | if (wpa_bss_in_use(wpa_s, bss)) | |
449 | continue; | |
450 | if (!wpa_bss_included_in_scan(bss, info)) | |
451 | continue; /* expire only BSSes that were scanned */ | |
452 | if (bss->last_update_idx < wpa_s->bss_update_idx) | |
453 | bss->scan_miss_count++; | |
454 | if (bss->scan_miss_count >= | |
455 | wpa_s->conf->bss_expiration_scan_count) { | |
456 | wpa_dbg(wpa_s, MSG_DEBUG, "BSS: Expire BSS %u due to " | |
457 | "no match in scan", bss->id); | |
458 | wpa_bss_remove(wpa_s, bss); | |
459 | } | |
460 | } | |
461 | } | |
462 | ||
463 | ||
464 | void wpa_bss_flush_by_age(struct wpa_supplicant *wpa_s, int age) | |
465 | { | |
466 | struct wpa_bss *bss, *n; | |
467 | struct os_time t; | |
468 | ||
469 | if (dl_list_empty(&wpa_s->bss)) | |
470 | return; | |
471 | ||
472 | os_get_time(&t); | |
473 | t.sec -= age; | |
474 | ||
475 | dl_list_for_each_safe(bss, n, &wpa_s->bss, struct wpa_bss, list) { | |
476 | if (wpa_bss_in_use(wpa_s, bss)) | |
477 | continue; | |
478 | ||
479 | if (os_time_before(&bss->last_update, &t)) { | |
480 | wpa_dbg(wpa_s, MSG_DEBUG, "BSS: Expire BSS %u due to " | |
481 | "age", bss->id); | |
482 | wpa_bss_remove(wpa_s, bss); | |
483 | } else | |
484 | break; | |
485 | } | |
486 | } | |
487 | ||
488 | ||
489 | static void wpa_bss_timeout(void *eloop_ctx, void *timeout_ctx) | |
490 | { | |
491 | struct wpa_supplicant *wpa_s = eloop_ctx; | |
492 | ||
493 | wpa_bss_flush_by_age(wpa_s, wpa_s->conf->bss_expiration_age); | |
494 | eloop_register_timeout(WPA_BSS_EXPIRATION_PERIOD, 0, | |
495 | wpa_bss_timeout, wpa_s, NULL); | |
496 | } | |
497 | ||
498 | ||
499 | int wpa_bss_init(struct wpa_supplicant *wpa_s) | |
500 | { | |
501 | dl_list_init(&wpa_s->bss); | |
502 | dl_list_init(&wpa_s->bss_id); | |
503 | eloop_register_timeout(WPA_BSS_EXPIRATION_PERIOD, 0, | |
504 | wpa_bss_timeout, wpa_s, NULL); | |
505 | return 0; | |
506 | } | |
507 | ||
508 | ||
509 | void wpa_bss_flush(struct wpa_supplicant *wpa_s) | |
510 | { | |
511 | struct wpa_bss *bss, *n; | |
512 | ||
513 | if (wpa_s->bss.next == NULL) | |
514 | return; /* BSS table not yet initialized */ | |
515 | ||
516 | dl_list_for_each_safe(bss, n, &wpa_s->bss, struct wpa_bss, list) { | |
517 | if (wpa_bss_in_use(wpa_s, bss)) | |
518 | continue; | |
519 | wpa_bss_remove(wpa_s, bss); | |
520 | } | |
521 | } | |
522 | ||
523 | ||
524 | void wpa_bss_deinit(struct wpa_supplicant *wpa_s) | |
525 | { | |
526 | eloop_cancel_timeout(wpa_bss_timeout, wpa_s, NULL); | |
527 | wpa_bss_flush(wpa_s); | |
528 | } | |
529 | ||
530 | ||
531 | struct wpa_bss * wpa_bss_get_bssid(struct wpa_supplicant *wpa_s, | |
532 | const u8 *bssid) | |
533 | { | |
534 | struct wpa_bss *bss; | |
535 | dl_list_for_each_reverse(bss, &wpa_s->bss, struct wpa_bss, list) { | |
536 | if (os_memcmp(bss->bssid, bssid, ETH_ALEN) == 0) | |
537 | return bss; | |
538 | } | |
539 | return NULL; | |
540 | } | |
541 | ||
542 | ||
543 | struct wpa_bss * wpa_bss_get_id(struct wpa_supplicant *wpa_s, unsigned int id) | |
544 | { | |
545 | struct wpa_bss *bss; | |
546 | dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list) { | |
547 | if (bss->id == id) | |
548 | return bss; | |
549 | } | |
550 | return NULL; | |
551 | } | |
552 | ||
553 | ||
554 | const u8 * wpa_bss_get_ie(const struct wpa_bss *bss, u8 ie) | |
555 | { | |
556 | const u8 *end, *pos; | |
557 | ||
558 | pos = (const u8 *) (bss + 1); | |
559 | end = pos + bss->ie_len; | |
560 | ||
561 | while (pos + 1 < end) { | |
562 | if (pos + 2 + pos[1] > end) | |
563 | break; | |
564 | if (pos[0] == ie) | |
565 | return pos; | |
566 | pos += 2 + pos[1]; | |
567 | } | |
568 | ||
569 | return NULL; | |
570 | } | |
571 | ||
572 | ||
573 | const u8 * wpa_bss_get_vendor_ie(const struct wpa_bss *bss, u32 vendor_type) | |
574 | { | |
575 | const u8 *end, *pos; | |
576 | ||
577 | pos = (const u8 *) (bss + 1); | |
578 | end = pos + bss->ie_len; | |
579 | ||
580 | while (pos + 1 < end) { | |
581 | if (pos + 2 + pos[1] > end) | |
582 | break; | |
583 | if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 && | |
584 | vendor_type == WPA_GET_BE32(&pos[2])) | |
585 | return pos; | |
586 | pos += 2 + pos[1]; | |
587 | } | |
588 | ||
589 | return NULL; | |
590 | } | |
591 | ||
592 | ||
593 | struct wpabuf * wpa_bss_get_vendor_ie_multi(const struct wpa_bss *bss, | |
594 | u32 vendor_type) | |
595 | { | |
596 | struct wpabuf *buf; | |
597 | const u8 *end, *pos; | |
598 | ||
599 | buf = wpabuf_alloc(bss->ie_len); | |
600 | if (buf == NULL) | |
601 | return NULL; | |
602 | ||
603 | pos = (const u8 *) (bss + 1); | |
604 | end = pos + bss->ie_len; | |
605 | ||
606 | while (pos + 1 < end) { | |
607 | if (pos + 2 + pos[1] > end) | |
608 | break; | |
609 | if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 && | |
610 | vendor_type == WPA_GET_BE32(&pos[2])) | |
611 | wpabuf_put_data(buf, pos + 2 + 4, pos[1] - 4); | |
612 | pos += 2 + pos[1]; | |
613 | } | |
614 | ||
615 | if (wpabuf_len(buf) == 0) { | |
616 | wpabuf_free(buf); | |
617 | buf = NULL; | |
618 | } | |
619 | ||
620 | return buf; | |
621 | } | |
622 | ||
623 | ||
624 | int wpa_bss_get_max_rate(const struct wpa_bss *bss) | |
625 | { | |
626 | int rate = 0; | |
627 | const u8 *ie; | |
628 | int i; | |
629 | ||
630 | ie = wpa_bss_get_ie(bss, WLAN_EID_SUPP_RATES); | |
631 | for (i = 0; ie && i < ie[1]; i++) { | |
632 | if ((ie[i + 2] & 0x7f) > rate) | |
633 | rate = ie[i + 2] & 0x7f; | |
634 | } | |
635 | ||
636 | ie = wpa_bss_get_ie(bss, WLAN_EID_EXT_SUPP_RATES); | |
637 | for (i = 0; ie && i < ie[1]; i++) { | |
638 | if ((ie[i + 2] & 0x7f) > rate) | |
639 | rate = ie[i + 2] & 0x7f; | |
640 | } | |
641 | ||
642 | return rate; | |
643 | } | |
644 | ||
645 | ||
646 | int wpa_bss_get_bit_rates(const struct wpa_bss *bss, u8 **rates) | |
647 | { | |
648 | const u8 *ie, *ie2; | |
649 | int i, j; | |
650 | unsigned int len; | |
651 | u8 *r; | |
652 | ||
653 | ie = wpa_bss_get_ie(bss, WLAN_EID_SUPP_RATES); | |
654 | ie2 = wpa_bss_get_ie(bss, WLAN_EID_EXT_SUPP_RATES); | |
655 | ||
656 | len = (ie ? ie[1] : 0) + (ie2 ? ie2[1] : 0); | |
657 | ||
658 | r = os_malloc(len); | |
659 | if (!r) | |
660 | return -1; | |
661 | ||
662 | for (i = 0; ie && i < ie[1]; i++) | |
663 | r[i] = ie[i + 2] & 0x7f; | |
664 | ||
665 | for (j = 0; ie2 && j < ie2[1]; j++) | |
666 | r[i + j] = ie2[j + 2] & 0x7f; | |
667 | ||
668 | *rates = r; | |
669 | return len; | |
670 | } |