wpa_supplicant/bss.c

   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 }