wpa_supplicant/bss.c

   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
   9 #include "utils/includes.h"
  10
  11 #include "utils/common.h"
  12 #include "utils/eloop.h"
  13 #include "common/ieee802_11_defs.h"
  14 #include "drivers/driver.h"
  15 #include "wpa_supplicant_i.h"
  16 #include "config.h"
  17 #include "notify.h"
  18 #include "scan.h"
  19 #include "bss.h"
  20
  21
  22 /**
  23  * WPA_BSS_EXPIRATION_PERIOD - Period of expiration run in seconds
  24  */
  25 #define WPA_BSS_EXPIRATION_PERIOD 10
  26
  27 #define WPA_BSS_FREQ_CHANGED_FLAG       BIT(0)
  28 #define WPA_BSS_SIGNAL_CHANGED_FLAG     BIT(1)
  29 #define WPA_BSS_PRIVACY_CHANGED_FLAG    BIT(2)
  30 #define WPA_BSS_MODE_CHANGED_FLAG       BIT(3)
  31 #define WPA_BSS_WPAIE_CHANGED_FLAG      BIT(4)
  32 #define WPA_BSS_RSNIE_CHANGED_FLAG      BIT(5)
  33 #define WPA_BSS_WPS_CHANGED_FLAG        BIT(6)
  34 #define WPA_BSS_RATES_CHANGED_FLAG      BIT(7)
  35 #define WPA_BSS_IES_CHANGED_FLAG        BIT(8)
  36
  37
  38 static void wpa_bss_remove(struct wpa_supplicant *wpa_s, struct wpa_bss *bss,
  39                            const char *reason)
  40 {
  41         if (wpa_s->last_scan_res) {
  42                 unsigned int i;
  43                 for (i = 0; i < wpa_s->last_scan_res_used; i++) {
  44                         if (wpa_s->last_scan_res[i] == bss) {
  45                                 os_memmove(&wpa_s->last_scan_res[i],
  46                                            &wpa_s->last_scan_res[i + 1],
  47                                            (wpa_s->last_scan_res_used - i - 1)
  48                                            * sizeof(struct wpa_bss *));
  49                                 wpa_s->last_scan_res_used--;
  50                                 break;
  51                         }
  52                 }
  53         }
  54         dl_list_del(&bss->list);
  55         dl_list_del(&bss->list_id);
  56         wpa_s->num_bss--;
  57         wpa_dbg(wpa_s, MSG_DEBUG, "BSS: Remove id %u BSSID " MACSTR
  58                 " SSID '%s' due to %s", bss->id, MAC2STR(bss->bssid),
  59                 wpa_ssid_txt(bss->ssid, bss->ssid_len), reason);
  60         wpas_notify_bss_removed(wpa_s, bss->bssid, bss->id);
  61 #ifdef CONFIG_INTERWORKING
  62         wpabuf_free(bss->anqp_venue_name);
  63         wpabuf_free(bss->anqp_network_auth_type);
  64         wpabuf_free(bss->anqp_roaming_consortium);
  65         wpabuf_free(bss->anqp_ip_addr_type_availability);
  66         wpabuf_free(bss->anqp_nai_realm);
  67         wpabuf_free(bss->anqp_3gpp);
  68         wpabuf_free(bss->anqp_domain_name);
  69 #endif /* CONFIG_INTERWORKING */
  70 #ifdef CONFIG_HS20
  71         wpabuf_free(bss->hs20_operator_friendly_name);
  72         wpabuf_free(bss->hs20_wan_metrics);
  73         wpabuf_free(bss->hs20_connection_capability);
  74         wpabuf_free(bss->hs20_operating_class);
  75 #endif /* CONFIG_HS20 */
  76         os_free(bss);
  77 }
  78
  79
  80 struct wpa_bss * wpa_bss_get(struct wpa_supplicant *wpa_s, const u8 *bssid,
  81                              const u8 *ssid, size_t ssid_len)
  82 {
  83         struct wpa_bss *bss;
  84         if (!wpa_supplicant_filter_bssid_match(wpa_s, bssid))
  85                 return NULL;
  86         dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list) {
  87                 if (os_memcmp(bss->bssid, bssid, ETH_ALEN) == 0 &&
  88                     bss->ssid_len == ssid_len &&
  89                     os_memcmp(bss->ssid, ssid, ssid_len) == 0)
  90                         return bss;
  91         }
  92         return NULL;
  93 }
  94
  95
  96 static void wpa_bss_copy_res(struct wpa_bss *dst, struct wpa_scan_res *src)
  97 {
  98         os_time_t usec;
  99
 100         dst->flags = src->flags;
 101         os_memcpy(dst->bssid, src->bssid, ETH_ALEN);
 102         dst->freq = src->freq;
 103         dst->beacon_int = src->beacon_int;
 104         dst->caps = src->caps;
 105         dst->qual = src->qual;
 106         dst->noise = src->noise;
 107         dst->level = src->level;
 108         dst->tsf = src->tsf;
 109
 110         os_get_time(&dst->last_update);
 111         dst->last_update.sec -= src->age / 1000;
 112         usec = (src->age % 1000) * 1000;
 113         if (dst->last_update.usec < usec) {
 114                 dst->last_update.sec--;
 115                 dst->last_update.usec += 1000000;
 116         }
 117         dst->last_update.usec -= usec;
 118 }
 119
 120
 121 static int wpa_bss_known(struct wpa_supplicant *wpa_s, struct wpa_bss *bss)
 122 {
 123         struct wpa_ssid *ssid;
 124
 125         for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
 126                 if (ssid->ssid == NULL || ssid->ssid_len == 0)
 127                         continue;
 128                 if (ssid->ssid_len == bss->ssid_len &&
 129                     os_memcmp(ssid->ssid, bss->ssid, ssid->ssid_len) == 0)
 130                         return 1;
 131         }
 132
 133         return 0;
 134 }
 135
 136
 137 static int wpa_bss_in_use(struct wpa_supplicant *wpa_s, struct wpa_bss *bss)
 138 {
 139         return bss == wpa_s->current_bss ||
 140                 os_memcmp(bss->bssid, wpa_s->bssid, ETH_ALEN) == 0 ||
 141                 os_memcmp(bss->bssid, wpa_s->pending_bssid, ETH_ALEN) == 0;
 142 }
 143
 144
 145 static int wpa_bss_remove_oldest_unknown(struct wpa_supplicant *wpa_s)
 146 {
 147         struct wpa_bss *bss;
 148
 149         dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list) {
 150                 if (!wpa_bss_known(wpa_s, bss)) {
 151                         wpa_bss_remove(wpa_s, bss, __func__);
 152                         return 0;
 153                 }
 154         }
 155
 156         return -1;
 157 }
 158
 159
 160 static int wpa_bss_remove_oldest(struct wpa_supplicant *wpa_s)
 161 {
 162         struct wpa_bss *bss;
 163
 164         /*
 165          * Remove the oldest entry that does not match with any configured
 166          * network.
 167          */
 168         if (wpa_bss_remove_oldest_unknown(wpa_s) == 0)
 169                 return 0;
 170
 171         /*
 172          * Remove the oldest entry that isn't currently in use.
 173          */
 174         dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list) {
 175                 if (!wpa_bss_in_use(wpa_s, bss)) {
 176                         wpa_bss_remove(wpa_s, bss, __func__);
 177                         return 0;
 178                 }
 179         }
 180
 181         return -1;
 182 }
 183
 184
 185 static struct wpa_bss * wpa_bss_add(struct wpa_supplicant *wpa_s,
 186                                     const u8 *ssid, size_t ssid_len,
 187                                     struct wpa_scan_res *res)
 188 {
 189         struct wpa_bss *bss;
 190
 191         bss = os_zalloc(sizeof(*bss) + res->ie_len + res->beacon_ie_len);
 192         if (bss == NULL)
 193                 return NULL;
 194         bss->id = wpa_s->bss_next_id++;
 195         bss->last_update_idx = wpa_s->bss_update_idx;
 196         wpa_bss_copy_res(bss, res);
 197         os_memcpy(bss->ssid, ssid, ssid_len);
 198         bss->ssid_len = ssid_len;
 199         bss->ie_len = res->ie_len;
 200         bss->beacon_ie_len = res->beacon_ie_len;
 201         os_memcpy(bss + 1, res + 1, res->ie_len + res->beacon_ie_len);
 202
 203         dl_list_add_tail(&wpa_s->bss, &bss->list);
 204         dl_list_add_tail(&wpa_s->bss_id, &bss->list_id);
 205         wpa_s->num_bss++;
 206         wpa_dbg(wpa_s, MSG_DEBUG, "BSS: Add new id %u BSSID " MACSTR
 207                 " SSID '%s'",
 208                 bss->id, MAC2STR(bss->bssid), wpa_ssid_txt(ssid, ssid_len));
 209         wpas_notify_bss_added(wpa_s, bss->bssid, bss->id);
 210         if (wpa_s->num_bss > wpa_s->conf->bss_max_count &&
 211             wpa_bss_remove_oldest(wpa_s) != 0) {
 212                 wpa_printf(MSG_ERROR, "Increasing the MAX BSS count to %d "
 213                            "because all BSSes are in use. We should normally "
 214                            "not get here!", (int) wpa_s->num_bss);
 215                 wpa_s->conf->bss_max_count = wpa_s->num_bss;
 216         }
 217         return bss;
 218 }
 219
 220
 221 static int are_ies_equal(const struct wpa_bss *old,
 222                          const struct wpa_scan_res *new, u32 ie)
 223 {
 224         const u8 *old_ie, *new_ie;
 225         struct wpabuf *old_ie_buff = NULL;
 226         struct wpabuf *new_ie_buff = NULL;
 227         int new_ie_len, old_ie_len, ret, is_multi;
 228
 229         switch (ie) {
 230         case WPA_IE_VENDOR_TYPE:
 231                 old_ie = wpa_bss_get_vendor_ie(old, ie);
 232                 new_ie = wpa_scan_get_vendor_ie(new, ie);
 233                 is_multi = 0;
 234                 break;
 235         case WPS_IE_VENDOR_TYPE:
 236                 old_ie_buff = wpa_bss_get_vendor_ie_multi(old, ie);
 237                 new_ie_buff = wpa_scan_get_vendor_ie_multi(new, ie);
 238                 is_multi = 1;
 239                 break;
 240         case WLAN_EID_RSN:
 241         case WLAN_EID_SUPP_RATES:
 242         case WLAN_EID_EXT_SUPP_RATES:
 243                 old_ie = wpa_bss_get_ie(old, ie);
 244                 new_ie = wpa_scan_get_ie(new, ie);
 245                 is_multi = 0;
 246                 break;
 247         default:
 248                 wpa_printf(MSG_DEBUG, "bss: %s: cannot compare IEs", __func__);
 249                 return 0;
 250         }
 251
 252         if (is_multi) {
 253                 /* in case of multiple IEs stored in buffer */
 254                 old_ie = old_ie_buff ? wpabuf_head_u8(old_ie_buff) : NULL;
 255                 new_ie = new_ie_buff ? wpabuf_head_u8(new_ie_buff) : NULL;
 256                 old_ie_len = old_ie_buff ? wpabuf_len(old_ie_buff) : 0;
 257                 new_ie_len = new_ie_buff ? wpabuf_len(new_ie_buff) : 0;
 258         } else {
 259                 /* in case of single IE */
 260                 old_ie_len = old_ie ? old_ie[1] + 2 : 0;
 261                 new_ie_len = new_ie ? new_ie[1] + 2 : 0;
 262         }
 263
 264         if (!old_ie || !new_ie)
 265                 ret = !old_ie && !new_ie;
 266         else
 267                 ret = (old_ie_len == new_ie_len &&
 268                        os_memcmp(old_ie, new_ie, old_ie_len) == 0);
 269
 270         wpabuf_free(old_ie_buff);
 271         wpabuf_free(new_ie_buff);
 272
 273         return ret;
 274 }
 275
 276
 277 static u32 wpa_bss_compare_res(const struct wpa_bss *old,
 278                                const struct wpa_scan_res *new)
 279 {
 280         u32 changes = 0;
 281         int caps_diff = old->caps ^ new->caps;
 282
 283         if (old->freq != new->freq)
 284                 changes |= WPA_BSS_FREQ_CHANGED_FLAG;
 285
 286         if (old->level != new->level)
 287                 changes |= WPA_BSS_SIGNAL_CHANGED_FLAG;
 288
 289         if (caps_diff & IEEE80211_CAP_PRIVACY)
 290                 changes |= WPA_BSS_PRIVACY_CHANGED_FLAG;
 291
 292         if (caps_diff & IEEE80211_CAP_IBSS)
 293                 changes |= WPA_BSS_MODE_CHANGED_FLAG;
 294
 295         if (old->ie_len == new->ie_len &&
 296             os_memcmp(old + 1, new + 1, old->ie_len) == 0)
 297                 return changes;
 298         changes |= WPA_BSS_IES_CHANGED_FLAG;
 299
 300         if (!are_ies_equal(old, new, WPA_IE_VENDOR_TYPE))
 301                 changes |= WPA_BSS_WPAIE_CHANGED_FLAG;
 302
 303         if (!are_ies_equal(old, new, WLAN_EID_RSN))
 304                 changes |= WPA_BSS_RSNIE_CHANGED_FLAG;
 305
 306         if (!are_ies_equal(old, new, WPS_IE_VENDOR_TYPE))
 307                 changes |= WPA_BSS_WPS_CHANGED_FLAG;
 308
 309         if (!are_ies_equal(old, new, WLAN_EID_SUPP_RATES) ||
 310             !are_ies_equal(old, new, WLAN_EID_EXT_SUPP_RATES))
 311                 changes |= WPA_BSS_RATES_CHANGED_FLAG;
 312
 313         return changes;
 314 }
 315
 316
 317 static void notify_bss_changes(struct wpa_supplicant *wpa_s, u32 changes,
 318                                const struct wpa_bss *bss)
 319 {
 320         if (changes & WPA_BSS_FREQ_CHANGED_FLAG)
 321                 wpas_notify_bss_freq_changed(wpa_s, bss->id);
 322
 323         if (changes & WPA_BSS_SIGNAL_CHANGED_FLAG)
 324                 wpas_notify_bss_signal_changed(wpa_s, bss->id);
 325
 326         if (changes & WPA_BSS_PRIVACY_CHANGED_FLAG)
 327                 wpas_notify_bss_privacy_changed(wpa_s, bss->id);
 328
 329         if (changes & WPA_BSS_MODE_CHANGED_FLAG)
 330                 wpas_notify_bss_mode_changed(wpa_s, bss->id);
 331
 332         if (changes & WPA_BSS_WPAIE_CHANGED_FLAG)
 333                 wpas_notify_bss_wpaie_changed(wpa_s, bss->id);
 334
 335         if (changes & WPA_BSS_RSNIE_CHANGED_FLAG)
 336                 wpas_notify_bss_rsnie_changed(wpa_s, bss->id);
 337
 338         if (changes & WPA_BSS_WPS_CHANGED_FLAG)
 339                 wpas_notify_bss_wps_changed(wpa_s, bss->id);
 340
 341         if (changes & WPA_BSS_IES_CHANGED_FLAG)
 342                 wpas_notify_bss_ies_changed(wpa_s, bss->id);
 343
 344         if (changes & WPA_BSS_RATES_CHANGED_FLAG)
 345                 wpas_notify_bss_rates_changed(wpa_s, bss->id);
 346 }
 347
 348
 349 static void wpa_bss_update(struct wpa_supplicant *wpa_s, struct wpa_bss *bss,
 350                            struct wpa_scan_res *res)
 351 {
 352         u32 changes;
 353
 354         changes = wpa_bss_compare_res(bss, res);
 355         bss->scan_miss_count = 0;
 356         bss->last_update_idx = wpa_s->bss_update_idx;
 357         wpa_bss_copy_res(bss, res);
 358         /* Move the entry to the end of the list */
 359         dl_list_del(&bss->list);
 360         if (bss->ie_len + bss->beacon_ie_len >=
 361             res->ie_len + res->beacon_ie_len) {
 362                 os_memcpy(bss + 1, res + 1, res->ie_len + res->beacon_ie_len);
 363                 bss->ie_len = res->ie_len;
 364                 bss->beacon_ie_len = res->beacon_ie_len;
 365         } else {
 366                 struct wpa_bss *nbss;
 367                 struct dl_list *prev = bss->list_id.prev;
 368                 dl_list_del(&bss->list_id);
 369                 nbss = os_realloc(bss, sizeof(*bss) + res->ie_len +
 370                                   res->beacon_ie_len);
 371                 if (nbss) {
 372                         if (wpa_s->current_bss == bss)
 373                                 wpa_s->current_bss = nbss;
 374                         bss = nbss;
 375                         os_memcpy(bss + 1, res + 1,
 376                                   res->ie_len + res->beacon_ie_len);
 377                         bss->ie_len = res->ie_len;
 378                         bss->beacon_ie_len = res->beacon_ie_len;
 379                 }
 380                 dl_list_add(prev, &bss->list_id);
 381         }
 382         dl_list_add_tail(&wpa_s->bss, &bss->list);
 383
 384         notify_bss_changes(wpa_s, changes, bss);
 385 }
 386
 387
 388 void wpa_bss_update_start(struct wpa_supplicant *wpa_s)
 389 {
 390         wpa_s->bss_update_idx++;
 391         wpa_dbg(wpa_s, MSG_DEBUG, "BSS: Start scan result update %u",
 392                 wpa_s->bss_update_idx);
 393         wpa_s->last_scan_res_used = 0;
 394 }
 395
 396
 397 void wpa_bss_update_scan_res(struct wpa_supplicant *wpa_s,
 398                              struct wpa_scan_res *res)
 399 {
 400         const u8 *ssid, *p2p;
 401         struct wpa_bss *bss;
 402
 403         ssid = wpa_scan_get_ie(res, WLAN_EID_SSID);
 404         if (ssid == NULL) {
 405                 wpa_dbg(wpa_s, MSG_DEBUG, "BSS: No SSID IE included for "
 406                         MACSTR, MAC2STR(res->bssid));
 407                 return;
 408         }
 409         if (ssid[1] > 32) {
 410                 wpa_dbg(wpa_s, MSG_DEBUG, "BSS: Too long SSID IE included for "
 411                         MACSTR, MAC2STR(res->bssid));
 412                 return;
 413         }
 414
 415         p2p = wpa_scan_get_vendor_ie(res, P2P_IE_VENDOR_TYPE);
 416 #ifdef CONFIG_P2P
 417         if (p2p == NULL &&
 418             wpa_s->p2p_group_interface != NOT_P2P_GROUP_INTERFACE) {
 419                 /*
 420                  * If it's a P2P specific interface, then don't update
 421                  * the scan result without a P2P IE.
 422                  */
 423                 wpa_printf(MSG_DEBUG, "BSS: No P2P IE - skipping BSS " MACSTR
 424                            " update for P2P interface", MAC2STR(res->bssid));
 425                 return;
 426         }
 427 #endif /* CONFIG_P2P */
 428         if (p2p && ssid[1] == P2P_WILDCARD_SSID_LEN &&
 429             os_memcmp(ssid + 2, P2P_WILDCARD_SSID, P2P_WILDCARD_SSID_LEN) == 0)
 430                 return; /* Skip P2P listen discovery results here */
 431
 432         /* TODO: add option for ignoring BSSes we are not interested in
 433          * (to save memory) */
 434         bss = wpa_bss_get(wpa_s, res->bssid, ssid + 2, ssid[1]);
 435         if (bss == NULL)
 436                 bss = wpa_bss_add(wpa_s, ssid + 2, ssid[1], res);
 437         else
 438                 wpa_bss_update(wpa_s, bss, res);
 439
 440         if (bss == NULL)
 441                 return;
 442         if (wpa_s->last_scan_res_used >= wpa_s->last_scan_res_size) {
 443                 struct wpa_bss **n;
 444                 unsigned int siz;
 445                 if (wpa_s->last_scan_res_size == 0)
 446                         siz = 32;
 447                 else
 448                         siz = wpa_s->last_scan_res_size * 2;
 449                 n = os_realloc_array(wpa_s->last_scan_res, siz,
 450                                      sizeof(struct wpa_bss *));
 451                 if (n == NULL)
 452                         return;
 453                 wpa_s->last_scan_res = n;
 454                 wpa_s->last_scan_res_size = siz;
 455         }
 456
 457         wpa_s->last_scan_res[wpa_s->last_scan_res_used++] = bss;
 458 }
 459
 460
 461 static int wpa_bss_included_in_scan(const struct wpa_bss *bss,
 462                                     const struct scan_info *info)
 463 {
 464         int found;
 465         size_t i;
 466
 467         if (info == NULL)
 468                 return 1;
 469
 470         if (info->num_freqs) {
 471                 found = 0;
 472                 for (i = 0; i < info->num_freqs; i++) {
 473                         if (bss->freq == info->freqs[i]) {
 474                                 found = 1;
 475                                 break;
 476                         }
 477                 }
 478                 if (!found)
 479                         return 0;
 480         }
 481
 482         if (info->num_ssids) {
 483                 found = 0;
 484                 for (i = 0; i < info->num_ssids; i++) {
 485                         const struct wpa_driver_scan_ssid *s = &info->ssids[i];
 486                         if ((s->ssid == NULL || s->ssid_len == 0) ||
 487                             (s->ssid_len == bss->ssid_len &&
 488                              os_memcmp(s->ssid, bss->ssid, bss->ssid_len) ==
 489                              0)) {
 490                                 found = 1;
 491                                 break;
 492                         }
 493                 }
 494                 if (!found)
 495                         return 0;
 496         }
 497
 498         return 1;
 499 }
 500
 501
 502 void wpa_bss_update_end(struct wpa_supplicant *wpa_s, struct scan_info *info,
 503                         int new_scan)
 504 {
 505         struct wpa_bss *bss, *n;
 506
 507         wpa_s->last_scan_full = 0;
 508         os_get_time(&wpa_s->last_scan);
 509         if (!new_scan)
 510                 return; /* do not expire entries without new scan */
 511
 512         if (info && !info->aborted && !info->freqs) {
 513                 size_t i;
 514                 if (info->num_ssids == 0) {
 515                         wpa_s->last_scan_full = 1;
 516                 } else {
 517                         for (i = 0; i < info->num_ssids; i++) {
 518                                 if (info->ssids[i].ssid == NULL ||
 519                                     info->ssids[i].ssid_len == 0) {
 520                                         wpa_s->last_scan_full = 1;
 521                                         break;
 522                                 }
 523                         }
 524                 }
 525         }
 526
 527         dl_list_for_each_safe(bss, n, &wpa_s->bss, struct wpa_bss, list) {
 528                 if (wpa_bss_in_use(wpa_s, bss))
 529                         continue;
 530                 if (!wpa_bss_included_in_scan(bss, info))
 531                         continue; /* expire only BSSes that were scanned */
 532                 if (bss->last_update_idx < wpa_s->bss_update_idx)
 533                         bss->scan_miss_count++;
 534                 if (bss->scan_miss_count >=
 535                     wpa_s->conf->bss_expiration_scan_count) {
 536                         wpa_bss_remove(wpa_s, bss, "no match in scan");
 537                 }
 538         }
 539
 540         wpa_printf(MSG_DEBUG, "BSS: last_scan_res_used=%u/%u "
 541                    "last_scan_full=%d",
 542                    wpa_s->last_scan_res_used, wpa_s->last_scan_res_size,
 543                    wpa_s->last_scan_full);
 544 }
 545
 546
 547 void wpa_bss_flush_by_age(struct wpa_supplicant *wpa_s, int age)
 548 {
 549         struct wpa_bss *bss, *n;
 550         struct os_time t;
 551
 552         if (dl_list_empty(&wpa_s->bss))
 553                 return;
 554
 555         os_get_time(&t);
 556         t.sec -= age;
 557
 558         dl_list_for_each_safe(bss, n, &wpa_s->bss, struct wpa_bss, list) {
 559                 if (wpa_bss_in_use(wpa_s, bss))
 560                         continue;
 561
 562                 if (os_time_before(&bss->last_update, &t)) {
 563                         wpa_bss_remove(wpa_s, bss, __func__);
 564                 } else
 565                         break;
 566         }
 567 }
 568
 569
 570 static void wpa_bss_timeout(void *eloop_ctx, void *timeout_ctx)
 571 {
 572         struct wpa_supplicant *wpa_s = eloop_ctx;
 573
 574         wpa_bss_flush_by_age(wpa_s, wpa_s->conf->bss_expiration_age);
 575         eloop_register_timeout(WPA_BSS_EXPIRATION_PERIOD, 0,
 576                                wpa_bss_timeout, wpa_s, NULL);
 577 }
 578
 579
 580 int wpa_bss_init(struct wpa_supplicant *wpa_s)
 581 {
 582         dl_list_init(&wpa_s->bss);
 583         dl_list_init(&wpa_s->bss_id);
 584         eloop_register_timeout(WPA_BSS_EXPIRATION_PERIOD, 0,
 585                                wpa_bss_timeout, wpa_s, NULL);
 586         return 0;
 587 }
 588
 589
 590 void wpa_bss_flush(struct wpa_supplicant *wpa_s)
 591 {
 592         struct wpa_bss *bss, *n;
 593
 594         if (wpa_s->bss.next == NULL)
 595                 return; /* BSS table not yet initialized */
 596
 597         dl_list_for_each_safe(bss, n, &wpa_s->bss, struct wpa_bss, list) {
 598                 if (wpa_bss_in_use(wpa_s, bss))
 599                         continue;
 600                 wpa_bss_remove(wpa_s, bss, __func__);
 601         }
 602 }
 603
 604
 605 void wpa_bss_deinit(struct wpa_supplicant *wpa_s)
 606 {
 607         eloop_cancel_timeout(wpa_bss_timeout, wpa_s, NULL);
 608         wpa_bss_flush(wpa_s);
 609 }
 610
 611
 612 struct wpa_bss * wpa_bss_get_bssid(struct wpa_supplicant *wpa_s,
 613                                    const u8 *bssid)
 614 {
 615         struct wpa_bss *bss;
 616         if (!wpa_supplicant_filter_bssid_match(wpa_s, bssid))
 617                 return NULL;
 618         dl_list_for_each_reverse(bss, &wpa_s->bss, struct wpa_bss, list) {
 619                 if (os_memcmp(bss->bssid, bssid, ETH_ALEN) == 0)
 620                         return bss;
 621         }
 622         return NULL;
 623 }
 624
 625
 626 #ifdef CONFIG_P2P
 627 struct wpa_bss * wpa_bss_get_p2p_dev_addr(struct wpa_supplicant *wpa_s,
 628                                           const u8 *dev_addr)
 629 {
 630         struct wpa_bss *bss;
 631         dl_list_for_each_reverse(bss, &wpa_s->bss, struct wpa_bss, list) {
 632                 u8 addr[ETH_ALEN];
 633                 if (p2p_parse_dev_addr((const u8 *) (bss + 1), bss->ie_len,
 634                                        addr) == 0 &&
 635                     os_memcmp(addr, dev_addr, ETH_ALEN) == 0)
 636                         return bss;
 637         }
 638         return NULL;
 639 }
 640 #endif /* CONFIG_P2P */
 641
 642
 643 struct wpa_bss * wpa_bss_get_id(struct wpa_supplicant *wpa_s, unsigned int id)
 644 {
 645         struct wpa_bss *bss;
 646         dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list) {
 647                 if (bss->id == id)
 648                         return bss;
 649         }
 650         return NULL;
 651 }
 652
 653
 654 const u8 * wpa_bss_get_ie(const struct wpa_bss *bss, u8 ie)
 655 {
 656         const u8 *end, *pos;
 657
 658         pos = (const u8 *) (bss + 1);
 659         end = pos + bss->ie_len;
 660
 661         while (pos + 1 < end) {
 662                 if (pos + 2 + pos[1] > end)
 663                         break;
 664                 if (pos[0] == ie)
 665                         return pos;
 666                 pos += 2 + pos[1];
 667         }
 668
 669         return NULL;
 670 }
 671
 672
 673 const u8 * wpa_bss_get_vendor_ie(const struct wpa_bss *bss, u32 vendor_type)
 674 {
 675         const u8 *end, *pos;
 676
 677         pos = (const u8 *) (bss + 1);
 678         end = pos + bss->ie_len;
 679
 680         while (pos + 1 < end) {
 681                 if (pos + 2 + pos[1] > end)
 682                         break;
 683                 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
 684                     vendor_type == WPA_GET_BE32(&pos[2]))
 685                         return pos;
 686                 pos += 2 + pos[1];
 687         }
 688
 689         return NULL;
 690 }
 691
 692
 693 struct wpabuf * wpa_bss_get_vendor_ie_multi(const struct wpa_bss *bss,
 694                                             u32 vendor_type)
 695 {
 696         struct wpabuf *buf;
 697         const u8 *end, *pos;
 698
 699         buf = wpabuf_alloc(bss->ie_len);
 700         if (buf == NULL)
 701                 return NULL;
 702
 703         pos = (const u8 *) (bss + 1);
 704         end = pos + bss->ie_len;
 705
 706         while (pos + 1 < end) {
 707                 if (pos + 2 + pos[1] > end)
 708                         break;
 709                 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
 710                     vendor_type == WPA_GET_BE32(&pos[2]))
 711                         wpabuf_put_data(buf, pos + 2 + 4, pos[1] - 4);
 712                 pos += 2 + pos[1];
 713         }
 714
 715         if (wpabuf_len(buf) == 0) {
 716                 wpabuf_free(buf);
 717                 buf = NULL;
 718         }
 719
 720         return buf;
 721 }
 722
 723
 724 int wpa_bss_get_max_rate(const struct wpa_bss *bss)
 725 {
 726         int rate = 0;
 727         const u8 *ie;
 728         int i;
 729
 730         ie = wpa_bss_get_ie(bss, WLAN_EID_SUPP_RATES);
 731         for (i = 0; ie && i < ie[1]; i++) {
 732                 if ((ie[i + 2] & 0x7f) > rate)
 733                         rate = ie[i + 2] & 0x7f;
 734         }
 735
 736         ie = wpa_bss_get_ie(bss, WLAN_EID_EXT_SUPP_RATES);
 737         for (i = 0; ie && i < ie[1]; i++) {
 738                 if ((ie[i + 2] & 0x7f) > rate)
 739                         rate = ie[i + 2] & 0x7f;
 740         }
 741
 742         return rate;
 743 }
 744
 745
 746 int wpa_bss_get_bit_rates(const struct wpa_bss *bss, u8 **rates)
 747 {
 748         const u8 *ie, *ie2;
 749         int i, j;
 750         unsigned int len;
 751         u8 *r;
 752
 753         ie = wpa_bss_get_ie(bss, WLAN_EID_SUPP_RATES);
 754         ie2 = wpa_bss_get_ie(bss, WLAN_EID_EXT_SUPP_RATES);
 755
 756         len = (ie ? ie[1] : 0) + (ie2 ? ie2[1] : 0);
 757
 758         r = os_malloc(len);
 759         if (!r)
 760                 return -1;
 761
 762         for (i = 0; ie && i < ie[1]; i++)
 763                 r[i] = ie[i + 2] & 0x7f;
 764
 765         for (j = 0; ie2 && j < ie2[1]; j++)
 766                 r[i + j] = ie2[j + 2] & 0x7f;
 767
 768         *rates = r;
 769         return len;
 770 }