bss.c 17 KB

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  1. /*
  2. * BSS table
  3. * Copyright (c) 2009-2010, Jouni Malinen <j@w1.fi>
  4. *
  5. * This software may be distributed under the terms of the BSD license.
  6. * See README for more details.
  7. */
  8. #include "utils/includes.h"
  9. #include "utils/common.h"
  10. #include "utils/eloop.h"
  11. #include "common/ieee802_11_defs.h"
  12. #include "drivers/driver.h"
  13. #include "wpa_supplicant_i.h"
  14. #include "config.h"
  15. #include "notify.h"
  16. #include "scan.h"
  17. #include "bss.h"
  18. /**
  19. * WPA_BSS_EXPIRATION_PERIOD - Period of expiration run in seconds
  20. */
  21. #define WPA_BSS_EXPIRATION_PERIOD 10
  22. #define WPA_BSS_FREQ_CHANGED_FLAG BIT(0)
  23. #define WPA_BSS_SIGNAL_CHANGED_FLAG BIT(1)
  24. #define WPA_BSS_PRIVACY_CHANGED_FLAG BIT(2)
  25. #define WPA_BSS_MODE_CHANGED_FLAG BIT(3)
  26. #define WPA_BSS_WPAIE_CHANGED_FLAG BIT(4)
  27. #define WPA_BSS_RSNIE_CHANGED_FLAG BIT(5)
  28. #define WPA_BSS_WPS_CHANGED_FLAG BIT(6)
  29. #define WPA_BSS_RATES_CHANGED_FLAG BIT(7)
  30. #define WPA_BSS_IES_CHANGED_FLAG BIT(8)
  31. static void wpa_bss_remove(struct wpa_supplicant *wpa_s, struct wpa_bss *bss,
  32. const char *reason)
  33. {
  34. dl_list_del(&bss->list);
  35. dl_list_del(&bss->list_id);
  36. wpa_s->num_bss--;
  37. wpa_dbg(wpa_s, MSG_DEBUG, "BSS: Remove id %u BSSID " MACSTR
  38. " SSID '%s' due to %s", bss->id, MAC2STR(bss->bssid),
  39. wpa_ssid_txt(bss->ssid, bss->ssid_len), reason);
  40. wpas_notify_bss_removed(wpa_s, bss->bssid, bss->id);
  41. #ifdef CONFIG_INTERWORKING
  42. wpabuf_free(bss->anqp_venue_name);
  43. wpabuf_free(bss->anqp_network_auth_type);
  44. wpabuf_free(bss->anqp_roaming_consortium);
  45. wpabuf_free(bss->anqp_ip_addr_type_availability);
  46. wpabuf_free(bss->anqp_nai_realm);
  47. wpabuf_free(bss->anqp_3gpp);
  48. wpabuf_free(bss->anqp_domain_name);
  49. #endif /* CONFIG_INTERWORKING */
  50. #ifdef CONFIG_HS20
  51. wpabuf_free(bss->hs20_operator_friendly_name);
  52. wpabuf_free(bss->hs20_wan_metrics);
  53. wpabuf_free(bss->hs20_connection_capability);
  54. wpabuf_free(bss->hs20_operating_class);
  55. #endif /* CONFIG_HS20 */
  56. os_free(bss);
  57. }
  58. struct wpa_bss * wpa_bss_get(struct wpa_supplicant *wpa_s, const u8 *bssid,
  59. const u8 *ssid, size_t ssid_len)
  60. {
  61. struct wpa_bss *bss;
  62. if (!wpa_supplicant_filter_bssid_match(wpa_s, bssid))
  63. return NULL;
  64. dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list) {
  65. if (os_memcmp(bss->bssid, bssid, ETH_ALEN) == 0 &&
  66. bss->ssid_len == ssid_len &&
  67. os_memcmp(bss->ssid, ssid, ssid_len) == 0)
  68. return bss;
  69. }
  70. return NULL;
  71. }
  72. static void wpa_bss_copy_res(struct wpa_bss *dst, struct wpa_scan_res *src)
  73. {
  74. os_time_t usec;
  75. dst->flags = src->flags;
  76. os_memcpy(dst->bssid, src->bssid, ETH_ALEN);
  77. dst->freq = src->freq;
  78. dst->beacon_int = src->beacon_int;
  79. dst->caps = src->caps;
  80. dst->qual = src->qual;
  81. dst->noise = src->noise;
  82. dst->level = src->level;
  83. dst->tsf = src->tsf;
  84. os_get_time(&dst->last_update);
  85. dst->last_update.sec -= src->age / 1000;
  86. usec = (src->age % 1000) * 1000;
  87. if (dst->last_update.usec < usec) {
  88. dst->last_update.sec--;
  89. dst->last_update.usec += 1000000;
  90. }
  91. dst->last_update.usec -= usec;
  92. }
  93. static int wpa_bss_known(struct wpa_supplicant *wpa_s, struct wpa_bss *bss)
  94. {
  95. struct wpa_ssid *ssid;
  96. for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
  97. if (ssid->ssid == NULL || ssid->ssid_len == 0)
  98. continue;
  99. if (ssid->ssid_len == bss->ssid_len &&
  100. os_memcmp(ssid->ssid, bss->ssid, ssid->ssid_len) == 0)
  101. return 1;
  102. }
  103. return 0;
  104. }
  105. static int wpa_bss_in_use(struct wpa_supplicant *wpa_s, struct wpa_bss *bss)
  106. {
  107. return bss == wpa_s->current_bss ||
  108. os_memcmp(bss->bssid, wpa_s->bssid, ETH_ALEN) == 0 ||
  109. os_memcmp(bss->bssid, wpa_s->pending_bssid, ETH_ALEN) == 0;
  110. }
  111. static int wpa_bss_remove_oldest_unknown(struct wpa_supplicant *wpa_s)
  112. {
  113. struct wpa_bss *bss;
  114. dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list) {
  115. if (!wpa_bss_known(wpa_s, bss)) {
  116. wpa_bss_remove(wpa_s, bss, __func__);
  117. return 0;
  118. }
  119. }
  120. return -1;
  121. }
  122. static int wpa_bss_remove_oldest(struct wpa_supplicant *wpa_s)
  123. {
  124. struct wpa_bss *bss;
  125. /*
  126. * Remove the oldest entry that does not match with any configured
  127. * network.
  128. */
  129. if (wpa_bss_remove_oldest_unknown(wpa_s) == 0)
  130. return 0;
  131. /*
  132. * Remove the oldest entry that isn't currently in use.
  133. */
  134. dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list) {
  135. if (!wpa_bss_in_use(wpa_s, bss)) {
  136. wpa_bss_remove(wpa_s, bss, __func__);
  137. return 0;
  138. }
  139. }
  140. return -1;
  141. }
  142. static void wpa_bss_add(struct wpa_supplicant *wpa_s,
  143. const u8 *ssid, size_t ssid_len,
  144. struct wpa_scan_res *res)
  145. {
  146. struct wpa_bss *bss;
  147. bss = os_zalloc(sizeof(*bss) + res->ie_len + res->beacon_ie_len);
  148. if (bss == NULL)
  149. return;
  150. bss->id = wpa_s->bss_next_id++;
  151. bss->last_update_idx = wpa_s->bss_update_idx;
  152. wpa_bss_copy_res(bss, res);
  153. os_memcpy(bss->ssid, ssid, ssid_len);
  154. bss->ssid_len = ssid_len;
  155. bss->ie_len = res->ie_len;
  156. bss->beacon_ie_len = res->beacon_ie_len;
  157. os_memcpy(bss + 1, res + 1, res->ie_len + res->beacon_ie_len);
  158. dl_list_add_tail(&wpa_s->bss, &bss->list);
  159. dl_list_add_tail(&wpa_s->bss_id, &bss->list_id);
  160. wpa_s->num_bss++;
  161. wpa_dbg(wpa_s, MSG_DEBUG, "BSS: Add new id %u BSSID " MACSTR
  162. " SSID '%s'",
  163. bss->id, MAC2STR(bss->bssid), wpa_ssid_txt(ssid, ssid_len));
  164. wpas_notify_bss_added(wpa_s, bss->bssid, bss->id);
  165. if (wpa_s->num_bss > wpa_s->conf->bss_max_count &&
  166. wpa_bss_remove_oldest(wpa_s) != 0) {
  167. wpa_printf(MSG_ERROR, "Increasing the MAX BSS count to %d "
  168. "because all BSSes are in use. We should normally "
  169. "not get here!", (int) wpa_s->num_bss);
  170. wpa_s->conf->bss_max_count = wpa_s->num_bss;
  171. }
  172. }
  173. static int are_ies_equal(const struct wpa_bss *old,
  174. const struct wpa_scan_res *new, u32 ie)
  175. {
  176. const u8 *old_ie, *new_ie;
  177. struct wpabuf *old_ie_buff = NULL;
  178. struct wpabuf *new_ie_buff = NULL;
  179. int new_ie_len, old_ie_len, ret, is_multi;
  180. switch (ie) {
  181. case WPA_IE_VENDOR_TYPE:
  182. old_ie = wpa_bss_get_vendor_ie(old, ie);
  183. new_ie = wpa_scan_get_vendor_ie(new, ie);
  184. is_multi = 0;
  185. break;
  186. case WPS_IE_VENDOR_TYPE:
  187. old_ie_buff = wpa_bss_get_vendor_ie_multi(old, ie);
  188. new_ie_buff = wpa_scan_get_vendor_ie_multi(new, ie);
  189. is_multi = 1;
  190. break;
  191. case WLAN_EID_RSN:
  192. case WLAN_EID_SUPP_RATES:
  193. case WLAN_EID_EXT_SUPP_RATES:
  194. old_ie = wpa_bss_get_ie(old, ie);
  195. new_ie = wpa_scan_get_ie(new, ie);
  196. is_multi = 0;
  197. break;
  198. default:
  199. wpa_printf(MSG_DEBUG, "bss: %s: cannot compare IEs", __func__);
  200. return 0;
  201. }
  202. if (is_multi) {
  203. /* in case of multiple IEs stored in buffer */
  204. old_ie = old_ie_buff ? wpabuf_head_u8(old_ie_buff) : NULL;
  205. new_ie = new_ie_buff ? wpabuf_head_u8(new_ie_buff) : NULL;
  206. old_ie_len = old_ie_buff ? wpabuf_len(old_ie_buff) : 0;
  207. new_ie_len = new_ie_buff ? wpabuf_len(new_ie_buff) : 0;
  208. } else {
  209. /* in case of single IE */
  210. old_ie_len = old_ie ? old_ie[1] + 2 : 0;
  211. new_ie_len = new_ie ? new_ie[1] + 2 : 0;
  212. }
  213. if (!old_ie || !new_ie)
  214. ret = !old_ie && !new_ie;
  215. else
  216. ret = (old_ie_len == new_ie_len &&
  217. os_memcmp(old_ie, new_ie, old_ie_len) == 0);
  218. wpabuf_free(old_ie_buff);
  219. wpabuf_free(new_ie_buff);
  220. return ret;
  221. }
  222. static u32 wpa_bss_compare_res(const struct wpa_bss *old,
  223. const struct wpa_scan_res *new)
  224. {
  225. u32 changes = 0;
  226. int caps_diff = old->caps ^ new->caps;
  227. if (old->freq != new->freq)
  228. changes |= WPA_BSS_FREQ_CHANGED_FLAG;
  229. if (old->level != new->level)
  230. changes |= WPA_BSS_SIGNAL_CHANGED_FLAG;
  231. if (caps_diff & IEEE80211_CAP_PRIVACY)
  232. changes |= WPA_BSS_PRIVACY_CHANGED_FLAG;
  233. if (caps_diff & IEEE80211_CAP_IBSS)
  234. changes |= WPA_BSS_MODE_CHANGED_FLAG;
  235. if (old->ie_len == new->ie_len &&
  236. os_memcmp(old + 1, new + 1, old->ie_len) == 0)
  237. return changes;
  238. changes |= WPA_BSS_IES_CHANGED_FLAG;
  239. if (!are_ies_equal(old, new, WPA_IE_VENDOR_TYPE))
  240. changes |= WPA_BSS_WPAIE_CHANGED_FLAG;
  241. if (!are_ies_equal(old, new, WLAN_EID_RSN))
  242. changes |= WPA_BSS_RSNIE_CHANGED_FLAG;
  243. if (!are_ies_equal(old, new, WPS_IE_VENDOR_TYPE))
  244. changes |= WPA_BSS_WPS_CHANGED_FLAG;
  245. if (!are_ies_equal(old, new, WLAN_EID_SUPP_RATES) ||
  246. !are_ies_equal(old, new, WLAN_EID_EXT_SUPP_RATES))
  247. changes |= WPA_BSS_RATES_CHANGED_FLAG;
  248. return changes;
  249. }
  250. static void notify_bss_changes(struct wpa_supplicant *wpa_s, u32 changes,
  251. const struct wpa_bss *bss)
  252. {
  253. if (changes & WPA_BSS_FREQ_CHANGED_FLAG)
  254. wpas_notify_bss_freq_changed(wpa_s, bss->id);
  255. if (changes & WPA_BSS_SIGNAL_CHANGED_FLAG)
  256. wpas_notify_bss_signal_changed(wpa_s, bss->id);
  257. if (changes & WPA_BSS_PRIVACY_CHANGED_FLAG)
  258. wpas_notify_bss_privacy_changed(wpa_s, bss->id);
  259. if (changes & WPA_BSS_MODE_CHANGED_FLAG)
  260. wpas_notify_bss_mode_changed(wpa_s, bss->id);
  261. if (changes & WPA_BSS_WPAIE_CHANGED_FLAG)
  262. wpas_notify_bss_wpaie_changed(wpa_s, bss->id);
  263. if (changes & WPA_BSS_RSNIE_CHANGED_FLAG)
  264. wpas_notify_bss_rsnie_changed(wpa_s, bss->id);
  265. if (changes & WPA_BSS_WPS_CHANGED_FLAG)
  266. wpas_notify_bss_wps_changed(wpa_s, bss->id);
  267. if (changes & WPA_BSS_IES_CHANGED_FLAG)
  268. wpas_notify_bss_ies_changed(wpa_s, bss->id);
  269. if (changes & WPA_BSS_RATES_CHANGED_FLAG)
  270. wpas_notify_bss_rates_changed(wpa_s, bss->id);
  271. }
  272. static void wpa_bss_update(struct wpa_supplicant *wpa_s, struct wpa_bss *bss,
  273. struct wpa_scan_res *res)
  274. {
  275. u32 changes;
  276. changes = wpa_bss_compare_res(bss, res);
  277. bss->scan_miss_count = 0;
  278. bss->last_update_idx = wpa_s->bss_update_idx;
  279. wpa_bss_copy_res(bss, res);
  280. /* Move the entry to the end of the list */
  281. dl_list_del(&bss->list);
  282. if (bss->ie_len + bss->beacon_ie_len >=
  283. res->ie_len + res->beacon_ie_len) {
  284. os_memcpy(bss + 1, res + 1, res->ie_len + res->beacon_ie_len);
  285. bss->ie_len = res->ie_len;
  286. bss->beacon_ie_len = res->beacon_ie_len;
  287. } else {
  288. struct wpa_bss *nbss;
  289. struct dl_list *prev = bss->list_id.prev;
  290. dl_list_del(&bss->list_id);
  291. nbss = os_realloc(bss, sizeof(*bss) + res->ie_len +
  292. res->beacon_ie_len);
  293. if (nbss) {
  294. if (wpa_s->current_bss == bss)
  295. wpa_s->current_bss = nbss;
  296. bss = nbss;
  297. os_memcpy(bss + 1, res + 1,
  298. res->ie_len + res->beacon_ie_len);
  299. bss->ie_len = res->ie_len;
  300. bss->beacon_ie_len = res->beacon_ie_len;
  301. }
  302. dl_list_add(prev, &bss->list_id);
  303. }
  304. dl_list_add_tail(&wpa_s->bss, &bss->list);
  305. notify_bss_changes(wpa_s, changes, bss);
  306. }
  307. void wpa_bss_update_start(struct wpa_supplicant *wpa_s)
  308. {
  309. wpa_s->bss_update_idx++;
  310. wpa_dbg(wpa_s, MSG_DEBUG, "BSS: Start scan result update %u",
  311. wpa_s->bss_update_idx);
  312. }
  313. void wpa_bss_update_scan_res(struct wpa_supplicant *wpa_s,
  314. struct wpa_scan_res *res)
  315. {
  316. const u8 *ssid, *p2p;
  317. struct wpa_bss *bss;
  318. ssid = wpa_scan_get_ie(res, WLAN_EID_SSID);
  319. if (ssid == NULL) {
  320. wpa_dbg(wpa_s, MSG_DEBUG, "BSS: No SSID IE included for "
  321. MACSTR, MAC2STR(res->bssid));
  322. return;
  323. }
  324. if (ssid[1] > 32) {
  325. wpa_dbg(wpa_s, MSG_DEBUG, "BSS: Too long SSID IE included for "
  326. MACSTR, MAC2STR(res->bssid));
  327. return;
  328. }
  329. p2p = wpa_scan_get_vendor_ie(res, P2P_IE_VENDOR_TYPE);
  330. #ifdef CONFIG_P2P
  331. if (p2p == NULL &&
  332. wpa_s->p2p_group_interface != NOT_P2P_GROUP_INTERFACE) {
  333. /*
  334. * If it's a P2P specific interface, then don't update
  335. * the scan result without a P2P IE.
  336. */
  337. wpa_printf(MSG_DEBUG, "BSS: No P2P IE - skipping BSS " MACSTR
  338. " update for P2P interface", MAC2STR(res->bssid));
  339. return;
  340. }
  341. #endif /* CONFIG_P2P */
  342. if (p2p && ssid[1] == P2P_WILDCARD_SSID_LEN &&
  343. os_memcmp(ssid + 2, P2P_WILDCARD_SSID, P2P_WILDCARD_SSID_LEN) == 0)
  344. return; /* Skip P2P listen discovery results here */
  345. /* TODO: add option for ignoring BSSes we are not interested in
  346. * (to save memory) */
  347. bss = wpa_bss_get(wpa_s, res->bssid, ssid + 2, ssid[1]);
  348. if (bss == NULL)
  349. wpa_bss_add(wpa_s, ssid + 2, ssid[1], res);
  350. else
  351. wpa_bss_update(wpa_s, bss, res);
  352. }
  353. static int wpa_bss_included_in_scan(const struct wpa_bss *bss,
  354. const struct scan_info *info)
  355. {
  356. int found;
  357. size_t i;
  358. if (info == NULL)
  359. return 1;
  360. if (info->num_freqs) {
  361. found = 0;
  362. for (i = 0; i < info->num_freqs; i++) {
  363. if (bss->freq == info->freqs[i]) {
  364. found = 1;
  365. break;
  366. }
  367. }
  368. if (!found)
  369. return 0;
  370. }
  371. if (info->num_ssids) {
  372. found = 0;
  373. for (i = 0; i < info->num_ssids; i++) {
  374. const struct wpa_driver_scan_ssid *s = &info->ssids[i];
  375. if ((s->ssid == NULL || s->ssid_len == 0) ||
  376. (s->ssid_len == bss->ssid_len &&
  377. os_memcmp(s->ssid, bss->ssid, bss->ssid_len) ==
  378. 0)) {
  379. found = 1;
  380. break;
  381. }
  382. }
  383. if (!found)
  384. return 0;
  385. }
  386. return 1;
  387. }
  388. void wpa_bss_update_end(struct wpa_supplicant *wpa_s, struct scan_info *info,
  389. int new_scan)
  390. {
  391. struct wpa_bss *bss, *n;
  392. if (!new_scan)
  393. return; /* do not expire entries without new scan */
  394. dl_list_for_each_safe(bss, n, &wpa_s->bss, struct wpa_bss, list) {
  395. if (wpa_bss_in_use(wpa_s, bss))
  396. continue;
  397. if (!wpa_bss_included_in_scan(bss, info))
  398. continue; /* expire only BSSes that were scanned */
  399. if (bss->last_update_idx < wpa_s->bss_update_idx)
  400. bss->scan_miss_count++;
  401. if (bss->scan_miss_count >=
  402. wpa_s->conf->bss_expiration_scan_count) {
  403. wpa_bss_remove(wpa_s, bss, "no match in scan");
  404. }
  405. }
  406. }
  407. void wpa_bss_flush_by_age(struct wpa_supplicant *wpa_s, int age)
  408. {
  409. struct wpa_bss *bss, *n;
  410. struct os_time t;
  411. if (dl_list_empty(&wpa_s->bss))
  412. return;
  413. os_get_time(&t);
  414. t.sec -= age;
  415. dl_list_for_each_safe(bss, n, &wpa_s->bss, struct wpa_bss, list) {
  416. if (wpa_bss_in_use(wpa_s, bss))
  417. continue;
  418. if (os_time_before(&bss->last_update, &t)) {
  419. wpa_bss_remove(wpa_s, bss, __func__);
  420. } else
  421. break;
  422. }
  423. }
  424. static void wpa_bss_timeout(void *eloop_ctx, void *timeout_ctx)
  425. {
  426. struct wpa_supplicant *wpa_s = eloop_ctx;
  427. wpa_bss_flush_by_age(wpa_s, wpa_s->conf->bss_expiration_age);
  428. eloop_register_timeout(WPA_BSS_EXPIRATION_PERIOD, 0,
  429. wpa_bss_timeout, wpa_s, NULL);
  430. }
  431. int wpa_bss_init(struct wpa_supplicant *wpa_s)
  432. {
  433. dl_list_init(&wpa_s->bss);
  434. dl_list_init(&wpa_s->bss_id);
  435. eloop_register_timeout(WPA_BSS_EXPIRATION_PERIOD, 0,
  436. wpa_bss_timeout, wpa_s, NULL);
  437. return 0;
  438. }
  439. void wpa_bss_flush(struct wpa_supplicant *wpa_s)
  440. {
  441. struct wpa_bss *bss, *n;
  442. if (wpa_s->bss.next == NULL)
  443. return; /* BSS table not yet initialized */
  444. dl_list_for_each_safe(bss, n, &wpa_s->bss, struct wpa_bss, list) {
  445. if (wpa_bss_in_use(wpa_s, bss))
  446. continue;
  447. wpa_bss_remove(wpa_s, bss, __func__);
  448. }
  449. }
  450. void wpa_bss_deinit(struct wpa_supplicant *wpa_s)
  451. {
  452. eloop_cancel_timeout(wpa_bss_timeout, wpa_s, NULL);
  453. wpa_bss_flush(wpa_s);
  454. }
  455. struct wpa_bss * wpa_bss_get_bssid(struct wpa_supplicant *wpa_s,
  456. const u8 *bssid)
  457. {
  458. struct wpa_bss *bss;
  459. if (!wpa_supplicant_filter_bssid_match(wpa_s, bssid))
  460. return NULL;
  461. dl_list_for_each_reverse(bss, &wpa_s->bss, struct wpa_bss, list) {
  462. if (os_memcmp(bss->bssid, bssid, ETH_ALEN) == 0)
  463. return bss;
  464. }
  465. return NULL;
  466. }
  467. #ifdef CONFIG_P2P
  468. struct wpa_bss * wpa_bss_get_p2p_dev_addr(struct wpa_supplicant *wpa_s,
  469. const u8 *dev_addr)
  470. {
  471. struct wpa_bss *bss;
  472. dl_list_for_each_reverse(bss, &wpa_s->bss, struct wpa_bss, list) {
  473. u8 addr[ETH_ALEN];
  474. if (p2p_parse_dev_addr((const u8 *) (bss + 1), bss->ie_len,
  475. addr) == 0 &&
  476. os_memcmp(addr, dev_addr, ETH_ALEN) == 0)
  477. return bss;
  478. }
  479. return NULL;
  480. }
  481. #endif /* CONFIG_P2P */
  482. struct wpa_bss * wpa_bss_get_id(struct wpa_supplicant *wpa_s, unsigned int id)
  483. {
  484. struct wpa_bss *bss;
  485. dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list) {
  486. if (bss->id == id)
  487. return bss;
  488. }
  489. return NULL;
  490. }
  491. const u8 * wpa_bss_get_ie(const struct wpa_bss *bss, u8 ie)
  492. {
  493. const u8 *end, *pos;
  494. pos = (const u8 *) (bss + 1);
  495. end = pos + bss->ie_len;
  496. while (pos + 1 < end) {
  497. if (pos + 2 + pos[1] > end)
  498. break;
  499. if (pos[0] == ie)
  500. return pos;
  501. pos += 2 + pos[1];
  502. }
  503. return NULL;
  504. }
  505. const u8 * wpa_bss_get_vendor_ie(const struct wpa_bss *bss, u32 vendor_type)
  506. {
  507. const u8 *end, *pos;
  508. pos = (const u8 *) (bss + 1);
  509. end = pos + bss->ie_len;
  510. while (pos + 1 < end) {
  511. if (pos + 2 + pos[1] > end)
  512. break;
  513. if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
  514. vendor_type == WPA_GET_BE32(&pos[2]))
  515. return pos;
  516. pos += 2 + pos[1];
  517. }
  518. return NULL;
  519. }
  520. struct wpabuf * wpa_bss_get_vendor_ie_multi(const struct wpa_bss *bss,
  521. u32 vendor_type)
  522. {
  523. struct wpabuf *buf;
  524. const u8 *end, *pos;
  525. buf = wpabuf_alloc(bss->ie_len);
  526. if (buf == NULL)
  527. return NULL;
  528. pos = (const u8 *) (bss + 1);
  529. end = pos + bss->ie_len;
  530. while (pos + 1 < end) {
  531. if (pos + 2 + pos[1] > end)
  532. break;
  533. if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
  534. vendor_type == WPA_GET_BE32(&pos[2]))
  535. wpabuf_put_data(buf, pos + 2 + 4, pos[1] - 4);
  536. pos += 2 + pos[1];
  537. }
  538. if (wpabuf_len(buf) == 0) {
  539. wpabuf_free(buf);
  540. buf = NULL;
  541. }
  542. return buf;
  543. }
  544. int wpa_bss_get_max_rate(const struct wpa_bss *bss)
  545. {
  546. int rate = 0;
  547. const u8 *ie;
  548. int i;
  549. ie = wpa_bss_get_ie(bss, WLAN_EID_SUPP_RATES);
  550. for (i = 0; ie && i < ie[1]; i++) {
  551. if ((ie[i + 2] & 0x7f) > rate)
  552. rate = ie[i + 2] & 0x7f;
  553. }
  554. ie = wpa_bss_get_ie(bss, WLAN_EID_EXT_SUPP_RATES);
  555. for (i = 0; ie && i < ie[1]; i++) {
  556. if ((ie[i + 2] & 0x7f) > rate)
  557. rate = ie[i + 2] & 0x7f;
  558. }
  559. return rate;
  560. }
  561. int wpa_bss_get_bit_rates(const struct wpa_bss *bss, u8 **rates)
  562. {
  563. const u8 *ie, *ie2;
  564. int i, j;
  565. unsigned int len;
  566. u8 *r;
  567. ie = wpa_bss_get_ie(bss, WLAN_EID_SUPP_RATES);
  568. ie2 = wpa_bss_get_ie(bss, WLAN_EID_EXT_SUPP_RATES);
  569. len = (ie ? ie[1] : 0) + (ie2 ? ie2[1] : 0);
  570. r = os_malloc(len);
  571. if (!r)
  572. return -1;
  573. for (i = 0; ie && i < ie[1]; i++)
  574. r[i] = ie[i + 2] & 0x7f;
  575. for (j = 0; ie2 && j < ie2[1]; j++)
  576. r[i + j] = ie2[j + 2] & 0x7f;
  577. *rates = r;
  578. return len;
  579. }