bss.c revision 1.1.1.1.6.1
1 /* 2 * BSS table 3 * Copyright (c) 2009-2010, Jouni Malinen <j (at) 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 if (wpa_s->current_bss == bss) 336 wpa_s->current_bss = nbss; 337 bss = nbss; 338 os_memcpy(bss + 1, res + 1, 339 res->ie_len + res->beacon_ie_len); 340 bss->ie_len = res->ie_len; 341 bss->beacon_ie_len = res->beacon_ie_len; 342 } 343 dl_list_add(prev, &bss->list_id); 344 } 345 dl_list_add_tail(&wpa_s->bss, &bss->list); 346 347 notify_bss_changes(wpa_s, changes, bss); 348 } 349 350 351 static int wpa_bss_in_use(struct wpa_supplicant *wpa_s, struct wpa_bss *bss) 352 { 353 return bss == wpa_s->current_bss || 354 os_memcmp(bss->bssid, wpa_s->bssid, ETH_ALEN) == 0 || 355 os_memcmp(bss->bssid, wpa_s->pending_bssid, ETH_ALEN) == 0; 356 } 357 358 359 void wpa_bss_update_start(struct wpa_supplicant *wpa_s) 360 { 361 wpa_s->bss_update_idx++; 362 wpa_dbg(wpa_s, MSG_DEBUG, "BSS: Start scan result update %u", 363 wpa_s->bss_update_idx); 364 } 365 366 367 void wpa_bss_update_scan_res(struct wpa_supplicant *wpa_s, 368 struct wpa_scan_res *res) 369 { 370 const u8 *ssid, *p2p; 371 struct wpa_bss *bss; 372 373 ssid = wpa_scan_get_ie(res, WLAN_EID_SSID); 374 if (ssid == NULL) { 375 wpa_dbg(wpa_s, MSG_DEBUG, "BSS: No SSID IE included for " 376 MACSTR, MAC2STR(res->bssid)); 377 return; 378 } 379 if (ssid[1] > 32) { 380 wpa_dbg(wpa_s, MSG_DEBUG, "BSS: Too long SSID IE included for " 381 MACSTR, MAC2STR(res->bssid)); 382 return; 383 } 384 385 p2p = wpa_scan_get_vendor_ie(res, P2P_IE_VENDOR_TYPE); 386 if (p2p && ssid[1] == P2P_WILDCARD_SSID_LEN && 387 os_memcmp(ssid + 2, P2P_WILDCARD_SSID, P2P_WILDCARD_SSID_LEN) == 0) 388 return; /* Skip P2P listen discovery results here */ 389 390 /* TODO: add option for ignoring BSSes we are not interested in 391 * (to save memory) */ 392 bss = wpa_bss_get(wpa_s, res->bssid, ssid + 2, ssid[1]); 393 if (bss == NULL) 394 wpa_bss_add(wpa_s, ssid + 2, ssid[1], res); 395 else 396 wpa_bss_update(wpa_s, bss, res); 397 } 398 399 400 static int wpa_bss_included_in_scan(const struct wpa_bss *bss, 401 const struct scan_info *info) 402 { 403 int found; 404 size_t i; 405 406 if (info == NULL) 407 return 1; 408 409 if (info->num_freqs) { 410 found = 0; 411 for (i = 0; i < info->num_freqs; i++) { 412 if (bss->freq == info->freqs[i]) { 413 found = 1; 414 break; 415 } 416 } 417 if (!found) 418 return 0; 419 } 420 421 if (info->num_ssids) { 422 found = 0; 423 for (i = 0; i < info->num_ssids; i++) { 424 const struct wpa_driver_scan_ssid *s = &info->ssids[i]; 425 if ((s->ssid == NULL || s->ssid_len == 0) || 426 (s->ssid_len == bss->ssid_len && 427 os_memcmp(s->ssid, bss->ssid, bss->ssid_len) == 428 0)) { 429 found = 1; 430 break; 431 } 432 } 433 if (!found) 434 return 0; 435 } 436 437 return 1; 438 } 439 440 441 void wpa_bss_update_end(struct wpa_supplicant *wpa_s, struct scan_info *info, 442 int new_scan) 443 { 444 struct wpa_bss *bss, *n; 445 446 if (!new_scan) 447 return; /* do not expire entries without new scan */ 448 449 dl_list_for_each_safe(bss, n, &wpa_s->bss, struct wpa_bss, list) { 450 if (wpa_bss_in_use(wpa_s, bss)) 451 continue; 452 if (!wpa_bss_included_in_scan(bss, info)) 453 continue; /* expire only BSSes that were scanned */ 454 if (bss->last_update_idx < wpa_s->bss_update_idx) 455 bss->scan_miss_count++; 456 if (bss->scan_miss_count >= 457 wpa_s->conf->bss_expiration_scan_count) { 458 wpa_dbg(wpa_s, MSG_DEBUG, "BSS: Expire BSS %u due to " 459 "no match in scan", bss->id); 460 wpa_bss_remove(wpa_s, bss); 461 } 462 } 463 } 464 465 466 void wpa_bss_flush_by_age(struct wpa_supplicant *wpa_s, int age) 467 { 468 struct wpa_bss *bss, *n; 469 struct os_time t; 470 471 if (dl_list_empty(&wpa_s->bss)) 472 return; 473 474 os_get_time(&t); 475 t.sec -= age; 476 477 dl_list_for_each_safe(bss, n, &wpa_s->bss, struct wpa_bss, list) { 478 if (wpa_bss_in_use(wpa_s, bss)) 479 continue; 480 481 if (os_time_before(&bss->last_update, &t)) { 482 wpa_dbg(wpa_s, MSG_DEBUG, "BSS: Expire BSS %u due to " 483 "age", bss->id); 484 wpa_bss_remove(wpa_s, bss); 485 } else 486 break; 487 } 488 } 489 490 491 static void wpa_bss_timeout(void *eloop_ctx, void *timeout_ctx) 492 { 493 struct wpa_supplicant *wpa_s = eloop_ctx; 494 495 wpa_bss_flush_by_age(wpa_s, wpa_s->conf->bss_expiration_age); 496 eloop_register_timeout(WPA_BSS_EXPIRATION_PERIOD, 0, 497 wpa_bss_timeout, wpa_s, NULL); 498 } 499 500 501 int wpa_bss_init(struct wpa_supplicant *wpa_s) 502 { 503 dl_list_init(&wpa_s->bss); 504 dl_list_init(&wpa_s->bss_id); 505 eloop_register_timeout(WPA_BSS_EXPIRATION_PERIOD, 0, 506 wpa_bss_timeout, wpa_s, NULL); 507 return 0; 508 } 509 510 511 void wpa_bss_flush(struct wpa_supplicant *wpa_s) 512 { 513 struct wpa_bss *bss, *n; 514 515 if (wpa_s->bss.next == NULL) 516 return; /* BSS table not yet initialized */ 517 518 dl_list_for_each_safe(bss, n, &wpa_s->bss, struct wpa_bss, list) { 519 if (wpa_bss_in_use(wpa_s, bss)) 520 continue; 521 wpa_bss_remove(wpa_s, bss); 522 } 523 } 524 525 526 void wpa_bss_deinit(struct wpa_supplicant *wpa_s) 527 { 528 eloop_cancel_timeout(wpa_bss_timeout, wpa_s, NULL); 529 wpa_bss_flush(wpa_s); 530 } 531 532 533 struct wpa_bss * wpa_bss_get_bssid(struct wpa_supplicant *wpa_s, 534 const u8 *bssid) 535 { 536 struct wpa_bss *bss; 537 dl_list_for_each_reverse(bss, &wpa_s->bss, struct wpa_bss, list) { 538 if (os_memcmp(bss->bssid, bssid, ETH_ALEN) == 0) 539 return bss; 540 } 541 return NULL; 542 } 543 544 545 #ifdef CONFIG_P2P 546 struct wpa_bss * wpa_bss_get_p2p_dev_addr(struct wpa_supplicant *wpa_s, 547 const u8 *dev_addr) 548 { 549 struct wpa_bss *bss; 550 dl_list_for_each_reverse(bss, &wpa_s->bss, struct wpa_bss, list) { 551 u8 addr[ETH_ALEN]; 552 if (p2p_parse_dev_addr((const u8 *) (bss + 1), bss->ie_len, 553 addr) == 0 && 554 os_memcmp(addr, dev_addr, ETH_ALEN) == 0) 555 return bss; 556 } 557 return NULL; 558 } 559 #endif /* CONFIG_P2P */ 560 561 562 struct wpa_bss * wpa_bss_get_id(struct wpa_supplicant *wpa_s, unsigned int id) 563 { 564 struct wpa_bss *bss; 565 dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list) { 566 if (bss->id == id) 567 return bss; 568 } 569 return NULL; 570 } 571 572 573 const u8 * wpa_bss_get_ie(const struct wpa_bss *bss, u8 ie) 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] == ie) 584 return pos; 585 pos += 2 + pos[1]; 586 } 587 588 return NULL; 589 } 590 591 592 const u8 * wpa_bss_get_vendor_ie(const struct wpa_bss *bss, u32 vendor_type) 593 { 594 const u8 *end, *pos; 595 596 pos = (const u8 *) (bss + 1); 597 end = pos + bss->ie_len; 598 599 while (pos + 1 < end) { 600 if (pos + 2 + pos[1] > end) 601 break; 602 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 && 603 vendor_type == WPA_GET_BE32(&pos[2])) 604 return pos; 605 pos += 2 + pos[1]; 606 } 607 608 return NULL; 609 } 610 611 612 struct wpabuf * wpa_bss_get_vendor_ie_multi(const struct wpa_bss *bss, 613 u32 vendor_type) 614 { 615 struct wpabuf *buf; 616 const u8 *end, *pos; 617 618 buf = wpabuf_alloc(bss->ie_len); 619 if (buf == NULL) 620 return NULL; 621 622 pos = (const u8 *) (bss + 1); 623 end = pos + bss->ie_len; 624 625 while (pos + 1 < end) { 626 if (pos + 2 + pos[1] > end) 627 break; 628 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 && 629 vendor_type == WPA_GET_BE32(&pos[2])) 630 wpabuf_put_data(buf, pos + 2 + 4, pos[1] - 4); 631 pos += 2 + pos[1]; 632 } 633 634 if (wpabuf_len(buf) == 0) { 635 wpabuf_free(buf); 636 buf = NULL; 637 } 638 639 return buf; 640 } 641 642 643 int wpa_bss_get_max_rate(const struct wpa_bss *bss) 644 { 645 int rate = 0; 646 const u8 *ie; 647 int i; 648 649 ie = wpa_bss_get_ie(bss, WLAN_EID_SUPP_RATES); 650 for (i = 0; ie && i < ie[1]; i++) { 651 if ((ie[i + 2] & 0x7f) > rate) 652 rate = ie[i + 2] & 0x7f; 653 } 654 655 ie = wpa_bss_get_ie(bss, WLAN_EID_EXT_SUPP_RATES); 656 for (i = 0; ie && i < ie[1]; i++) { 657 if ((ie[i + 2] & 0x7f) > rate) 658 rate = ie[i + 2] & 0x7f; 659 } 660 661 return rate; 662 } 663 664 665 int wpa_bss_get_bit_rates(const struct wpa_bss *bss, u8 **rates) 666 { 667 const u8 *ie, *ie2; 668 int i, j; 669 unsigned int len; 670 u8 *r; 671 672 ie = wpa_bss_get_ie(bss, WLAN_EID_SUPP_RATES); 673 ie2 = wpa_bss_get_ie(bss, WLAN_EID_EXT_SUPP_RATES); 674 675 len = (ie ? ie[1] : 0) + (ie2 ? ie2[1] : 0); 676 677 r = os_malloc(len); 678 if (!r) 679 return -1; 680 681 for (i = 0; ie && i < ie[1]; i++) 682 r[i] = ie[i + 2] & 0x7f; 683 684 for (j = 0; ie2 && j < ie2[1]; j++) 685 r[i + j] = ie2[j + 2] & 0x7f; 686 687 *rates = r; 688 return len; 689 } 690
Indexes created Mon Mar 16 00:23:04 UTC 2026