scan.c revision 61d9df3e62aaa0e87ad05452fcb95142159a17b6
1/* 2 * WPA Supplicant - Scanning 3 * Copyright (c) 2003-2010, 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 "config.h" 15#include "wpa_supplicant_i.h" 16#include "driver_i.h" 17#include "wps_supplicant.h" 18#include "p2p_supplicant.h" 19#include "p2p/p2p.h" 20#include "hs20_supplicant.h" 21#include "notify.h" 22#include "bss.h" 23#include "scan.h" 24 25 26static void wpa_supplicant_gen_assoc_event(struct wpa_supplicant *wpa_s) 27{ 28 struct wpa_ssid *ssid; 29 union wpa_event_data data; 30 31 ssid = wpa_supplicant_get_ssid(wpa_s); 32 if (ssid == NULL) 33 return; 34 35 if (wpa_s->current_ssid == NULL) { 36 wpa_s->current_ssid = ssid; 37 if (wpa_s->current_ssid != NULL) 38 wpas_notify_network_changed(wpa_s); 39 } 40 wpa_supplicant_initiate_eapol(wpa_s); 41 wpa_dbg(wpa_s, MSG_DEBUG, "Already associated with a configured " 42 "network - generating associated event"); 43 os_memset(&data, 0, sizeof(data)); 44 wpa_supplicant_event(wpa_s, EVENT_ASSOC, &data); 45} 46 47 48#ifdef CONFIG_WPS 49static int wpas_wps_in_use(struct wpa_supplicant *wpa_s, 50 enum wps_request_type *req_type) 51{ 52 struct wpa_ssid *ssid; 53 int wps = 0; 54 55 for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) { 56 if (!(ssid->key_mgmt & WPA_KEY_MGMT_WPS)) 57 continue; 58 59 wps = 1; 60 *req_type = wpas_wps_get_req_type(ssid); 61 if (!ssid->eap.phase1) 62 continue; 63 64 if (os_strstr(ssid->eap.phase1, "pbc=1")) 65 return 2; 66 } 67 68#ifdef CONFIG_P2P 69 if (!wpa_s->global->p2p_disabled && wpa_s->global->p2p) { 70 wpa_s->wps->dev.p2p = 1; 71 if (!wps) { 72 wps = 1; 73 *req_type = WPS_REQ_ENROLLEE_INFO; 74 } 75 } 76#endif /* CONFIG_P2P */ 77 78 return wps; 79} 80#endif /* CONFIG_WPS */ 81 82 83int wpa_supplicant_enabled_networks(struct wpa_supplicant *wpa_s) 84{ 85 struct wpa_ssid *ssid = wpa_s->conf->ssid; 86 int count = 0; 87 while (ssid) { 88 if (!wpas_network_disabled(wpa_s, ssid)) 89 count++; 90 ssid = ssid->next; 91 } 92 if (wpa_s->conf->cred && wpa_s->conf->interworking && 93 wpa_s->conf->auto_interworking) 94 count++; 95 return count; 96} 97 98 99static void wpa_supplicant_assoc_try(struct wpa_supplicant *wpa_s, 100 struct wpa_ssid *ssid) 101{ 102 while (ssid) { 103 if (!wpas_network_disabled(wpa_s, ssid)) 104 break; 105 ssid = ssid->next; 106 } 107 108 /* ap_scan=2 mode - try to associate with each SSID. */ 109 if (ssid == NULL) { 110 wpa_dbg(wpa_s, MSG_DEBUG, "wpa_supplicant_assoc_try: Reached " 111 "end of scan list - go back to beginning"); 112 wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN; 113 wpa_supplicant_req_scan(wpa_s, 0, 0); 114 return; 115 } 116 if (ssid->next) { 117 /* Continue from the next SSID on the next attempt. */ 118 wpa_s->prev_scan_ssid = ssid; 119 } else { 120 /* Start from the beginning of the SSID list. */ 121 wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN; 122 } 123 wpa_supplicant_associate(wpa_s, NULL, ssid); 124} 125 126 127static int int_array_len(const int *a) 128{ 129 int i; 130 for (i = 0; a && a[i]; i++) 131 ; 132 return i; 133} 134 135 136static void int_array_concat(int **res, const int *a) 137{ 138 int reslen, alen, i; 139 int *n; 140 141 reslen = int_array_len(*res); 142 alen = int_array_len(a); 143 144 n = os_realloc_array(*res, reslen + alen + 1, sizeof(int)); 145 if (n == NULL) { 146 os_free(*res); 147 *res = NULL; 148 return; 149 } 150 for (i = 0; i <= alen; i++) 151 n[reslen + i] = a[i]; 152 *res = n; 153} 154 155 156static int freq_cmp(const void *a, const void *b) 157{ 158 int _a = *(int *) a; 159 int _b = *(int *) b; 160 161 if (_a == 0) 162 return 1; 163 if (_b == 0) 164 return -1; 165 return _a - _b; 166} 167 168 169static void int_array_sort_unique(int *a) 170{ 171 int alen; 172 int i, j; 173 174 if (a == NULL) 175 return; 176 177 alen = int_array_len(a); 178 qsort(a, alen, sizeof(int), freq_cmp); 179 180 i = 0; 181 j = 1; 182 while (a[i] && a[j]) { 183 if (a[i] == a[j]) { 184 j++; 185 continue; 186 } 187 a[++i] = a[j++]; 188 } 189 if (a[i]) 190 i++; 191 a[i] = 0; 192} 193 194 195int wpa_supplicant_trigger_scan(struct wpa_supplicant *wpa_s, 196 struct wpa_driver_scan_params *params) 197{ 198 int ret; 199 200 wpa_supplicant_notify_scanning(wpa_s, 1); 201 202 ret = wpa_drv_scan(wpa_s, params); 203 if (ret) { 204 wpa_supplicant_notify_scanning(wpa_s, 0); 205 wpas_notify_scan_done(wpa_s, 0); 206 } else { 207 wpa_s->scan_runs++; 208 wpa_s->normal_scans++; 209 } 210 211 return ret; 212} 213 214 215static void 216wpa_supplicant_delayed_sched_scan_timeout(void *eloop_ctx, void *timeout_ctx) 217{ 218 struct wpa_supplicant *wpa_s = eloop_ctx; 219 220 wpa_dbg(wpa_s, MSG_DEBUG, "Starting delayed sched scan"); 221 222 if (wpa_supplicant_req_sched_scan(wpa_s)) 223 wpa_supplicant_req_scan(wpa_s, 0, 0); 224} 225 226 227static void 228wpa_supplicant_sched_scan_timeout(void *eloop_ctx, void *timeout_ctx) 229{ 230 struct wpa_supplicant *wpa_s = eloop_ctx; 231 232 wpa_dbg(wpa_s, MSG_DEBUG, "Sched scan timeout - stopping it"); 233 234 wpa_s->sched_scan_timed_out = 1; 235 wpa_supplicant_cancel_sched_scan(wpa_s); 236} 237 238 239static int 240wpa_supplicant_start_sched_scan(struct wpa_supplicant *wpa_s, 241 struct wpa_driver_scan_params *params, 242 int interval) 243{ 244 int ret; 245#ifndef ANDROID_P2P 246 wpa_supplicant_notify_scanning(wpa_s, 1); 247#endif 248 ret = wpa_drv_sched_scan(wpa_s, params, interval * 1000); 249 if (ret) 250 wpa_supplicant_notify_scanning(wpa_s, 0); 251 else { 252 wpa_s->sched_scanning = 1; 253#ifdef ANDROID_P2P 254 wpa_supplicant_notify_scanning(wpa_s, 1); 255#endif 256 } 257 258 return ret; 259} 260 261 262static int wpa_supplicant_stop_sched_scan(struct wpa_supplicant *wpa_s) 263{ 264 int ret; 265 266 ret = wpa_drv_stop_sched_scan(wpa_s); 267 if (ret) { 268 wpa_dbg(wpa_s, MSG_DEBUG, "stopping sched_scan failed!"); 269 /* TODO: what to do if stopping fails? */ 270 return -1; 271 } 272 273 return ret; 274} 275 276 277static struct wpa_driver_scan_filter * 278wpa_supplicant_build_filter_ssids(struct wpa_config *conf, size_t *num_ssids) 279{ 280 struct wpa_driver_scan_filter *ssids; 281 struct wpa_ssid *ssid; 282 size_t count; 283 284 *num_ssids = 0; 285 if (!conf->filter_ssids) 286 return NULL; 287 288 for (count = 0, ssid = conf->ssid; ssid; ssid = ssid->next) { 289 if (ssid->ssid && ssid->ssid_len) 290 count++; 291 } 292 if (count == 0) 293 return NULL; 294 ssids = os_zalloc(count * sizeof(struct wpa_driver_scan_filter)); 295 if (ssids == NULL) 296 return NULL; 297 298 for (ssid = conf->ssid; ssid; ssid = ssid->next) { 299 if (!ssid->ssid || !ssid->ssid_len) 300 continue; 301 os_memcpy(ssids[*num_ssids].ssid, ssid->ssid, ssid->ssid_len); 302 ssids[*num_ssids].ssid_len = ssid->ssid_len; 303 (*num_ssids)++; 304 } 305 306 return ssids; 307} 308 309 310static void wpa_supplicant_optimize_freqs( 311 struct wpa_supplicant *wpa_s, struct wpa_driver_scan_params *params) 312{ 313#ifdef CONFIG_P2P 314 if (params->freqs == NULL && wpa_s->p2p_in_provisioning && 315 wpa_s->go_params) { 316 /* Optimize provisioning state scan based on GO information */ 317 if (wpa_s->p2p_in_provisioning < 5 && 318 wpa_s->go_params->freq > 0) { 319 wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only GO " 320 "preferred frequency %d MHz", 321 wpa_s->go_params->freq); 322 params->freqs = os_zalloc(2 * sizeof(int)); 323 if (params->freqs) 324 params->freqs[0] = wpa_s->go_params->freq; 325 } else if (wpa_s->p2p_in_provisioning < 8 && 326 wpa_s->go_params->freq_list[0]) { 327 wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only common " 328 "channels"); 329 int_array_concat(¶ms->freqs, 330 wpa_s->go_params->freq_list); 331 if (params->freqs) 332 int_array_sort_unique(params->freqs); 333 } 334 wpa_s->p2p_in_provisioning++; 335 } 336#endif /* CONFIG_P2P */ 337 338#ifdef CONFIG_WPS 339 if (params->freqs == NULL && wpa_s->after_wps && wpa_s->wps_freq) { 340 /* 341 * Optimize post-provisioning scan based on channel used 342 * during provisioning. 343 */ 344 wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Scan only frequency %u MHz " 345 "that was used during provisioning", wpa_s->wps_freq); 346 params->freqs = os_zalloc(2 * sizeof(int)); 347 if (params->freqs) 348 params->freqs[0] = wpa_s->wps_freq; 349 wpa_s->after_wps--; 350 } 351 352 if (params->freqs == NULL && wpa_s->known_wps_freq && wpa_s->wps_freq) 353 { 354 /* Optimize provisioning scan based on already known channel */ 355 wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Scan only frequency %u MHz", 356 wpa_s->wps_freq); 357 params->freqs = os_zalloc(2 * sizeof(int)); 358 if (params->freqs) 359 params->freqs[0] = wpa_s->wps_freq; 360 wpa_s->known_wps_freq = 0; /* only do this once */ 361 } 362#endif /* CONFIG_WPS */ 363} 364 365 366#ifdef CONFIG_INTERWORKING 367static void wpas_add_interworking_elements(struct wpa_supplicant *wpa_s, 368 struct wpabuf *buf) 369{ 370 if (wpa_s->conf->interworking == 0) 371 return; 372 373 wpabuf_put_u8(buf, WLAN_EID_EXT_CAPAB); 374 wpabuf_put_u8(buf, 4); 375 wpabuf_put_u8(buf, 0x00); 376 wpabuf_put_u8(buf, 0x00); 377 wpabuf_put_u8(buf, 0x00); 378 wpabuf_put_u8(buf, 0x80); /* Bit 31 - Interworking */ 379 380 wpabuf_put_u8(buf, WLAN_EID_INTERWORKING); 381 wpabuf_put_u8(buf, is_zero_ether_addr(wpa_s->conf->hessid) ? 1 : 382 1 + ETH_ALEN); 383 wpabuf_put_u8(buf, wpa_s->conf->access_network_type); 384 /* No Venue Info */ 385 if (!is_zero_ether_addr(wpa_s->conf->hessid)) 386 wpabuf_put_data(buf, wpa_s->conf->hessid, ETH_ALEN); 387} 388#endif /* CONFIG_INTERWORKING */ 389 390 391static struct wpabuf * wpa_supplicant_extra_ies(struct wpa_supplicant *wpa_s) 392{ 393 struct wpabuf *extra_ie = NULL; 394#ifdef CONFIG_WPS 395 int wps = 0; 396 enum wps_request_type req_type = WPS_REQ_ENROLLEE_INFO; 397#endif /* CONFIG_WPS */ 398 399#ifdef CONFIG_INTERWORKING 400 if (wpa_s->conf->interworking && 401 wpabuf_resize(&extra_ie, 100) == 0) 402 wpas_add_interworking_elements(wpa_s, extra_ie); 403#endif /* CONFIG_INTERWORKING */ 404 405#ifdef CONFIG_WPS 406 wps = wpas_wps_in_use(wpa_s, &req_type); 407 408 if (wps) { 409 struct wpabuf *wps_ie; 410 wps_ie = wps_build_probe_req_ie(wps == 2 ? DEV_PW_PUSHBUTTON : 411 DEV_PW_DEFAULT, 412 &wpa_s->wps->dev, 413 wpa_s->wps->uuid, req_type, 414 0, NULL); 415 if (wps_ie) { 416 if (wpabuf_resize(&extra_ie, wpabuf_len(wps_ie)) == 0) 417 wpabuf_put_buf(extra_ie, wps_ie); 418 wpabuf_free(wps_ie); 419 } 420 } 421 422#ifdef CONFIG_P2P 423 if (wps) { 424 size_t ielen = p2p_scan_ie_buf_len(wpa_s->global->p2p); 425 if (wpabuf_resize(&extra_ie, ielen) == 0) 426 wpas_p2p_scan_ie(wpa_s, extra_ie); 427 } 428#endif /* CONFIG_P2P */ 429 430#endif /* CONFIG_WPS */ 431 432 return extra_ie; 433} 434 435 436static void wpa_supplicant_scan(void *eloop_ctx, void *timeout_ctx) 437{ 438 struct wpa_supplicant *wpa_s = eloop_ctx; 439 struct wpa_ssid *ssid; 440 int scan_req = 0, ret; 441 struct wpabuf *extra_ie = NULL; 442 struct wpa_driver_scan_params params; 443 struct wpa_driver_scan_params *scan_params; 444 size_t max_ssids; 445 enum wpa_states prev_state; 446 447 if (wpa_s->wpa_state == WPA_INTERFACE_DISABLED) { 448 wpa_dbg(wpa_s, MSG_DEBUG, "Skip scan - interface disabled"); 449 return; 450 } 451 452 if (wpa_s->disconnected && !wpa_s->scan_req) { 453 wpa_supplicant_set_state(wpa_s, WPA_DISCONNECTED); 454 return; 455 } 456 457 if (!wpa_supplicant_enabled_networks(wpa_s) && 458 !wpa_s->scan_req) { 459 wpa_dbg(wpa_s, MSG_DEBUG, "No enabled networks - do not scan"); 460 wpa_supplicant_set_state(wpa_s, WPA_INACTIVE); 461 return; 462 } 463 464 if (wpa_s->conf->ap_scan != 0 && 465 (wpa_s->drv_flags & WPA_DRIVER_FLAGS_WIRED)) { 466 wpa_dbg(wpa_s, MSG_DEBUG, "Using wired authentication - " 467 "overriding ap_scan configuration"); 468 wpa_s->conf->ap_scan = 0; 469 wpas_notify_ap_scan_changed(wpa_s); 470 } 471 472 if (wpa_s->conf->ap_scan == 0) { 473 wpa_supplicant_gen_assoc_event(wpa_s); 474 return; 475 } 476 477#ifdef CONFIG_P2P 478 if (wpas_p2p_in_progress(wpa_s)) { 479 if (wpa_s->sta_scan_pending && 480 wpas_p2p_in_progress(wpa_s) == 2 && 481 wpa_s->p2p_cb_on_scan_complete) { 482 wpa_dbg(wpa_s, MSG_DEBUG, "Process pending station " 483 "mode scan during P2P search"); 484 } else { 485 wpa_dbg(wpa_s, MSG_DEBUG, "Delay station mode scan " 486 "while P2P operation is in progress"); 487 wpa_s->sta_scan_pending = 1; 488 wpa_supplicant_req_scan(wpa_s, 5, 0); 489 return; 490 } 491 } 492#endif /* CONFIG_P2P */ 493 494 if (wpa_s->conf->ap_scan == 2) 495 max_ssids = 1; 496 else { 497 max_ssids = wpa_s->max_scan_ssids; 498 if (max_ssids > WPAS_MAX_SCAN_SSIDS) 499 max_ssids = WPAS_MAX_SCAN_SSIDS; 500 } 501 502 scan_req = wpa_s->scan_req; 503 wpa_s->scan_req = 0; 504 505 os_memset(¶ms, 0, sizeof(params)); 506 507 prev_state = wpa_s->wpa_state; 508 if (wpa_s->wpa_state == WPA_DISCONNECTED || 509 wpa_s->wpa_state == WPA_INACTIVE) 510 wpa_supplicant_set_state(wpa_s, WPA_SCANNING); 511 512 /* 513 * If autoscan has set its own scanning parameters 514 */ 515 if (wpa_s->autoscan_params != NULL) { 516 scan_params = wpa_s->autoscan_params; 517 goto scan; 518 } 519 520 if (scan_req != 2 && wpa_s->connect_without_scan) { 521 for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) { 522 if (ssid == wpa_s->connect_without_scan) 523 break; 524 } 525 wpa_s->connect_without_scan = NULL; 526 if (ssid) { 527 wpa_printf(MSG_DEBUG, "Start a pre-selected network " 528 "without scan step"); 529 wpa_supplicant_associate(wpa_s, NULL, ssid); 530 return; 531 } 532 } 533 534#ifdef CONFIG_P2P 535 if ((wpa_s->p2p_in_provisioning || wpa_s->show_group_started) && 536 wpa_s->go_params) { 537 wpa_printf(MSG_DEBUG, "P2P: Use specific SSID for scan during " 538 "P2P group formation"); 539 params.ssids[0].ssid = wpa_s->go_params->ssid; 540 params.ssids[0].ssid_len = wpa_s->go_params->ssid_len; 541 params.num_ssids = 1; 542 goto ssid_list_set; 543 } 544#endif /* CONFIG_P2P */ 545 546 /* Find the starting point from which to continue scanning */ 547 ssid = wpa_s->conf->ssid; 548 if (wpa_s->prev_scan_ssid != WILDCARD_SSID_SCAN) { 549 while (ssid) { 550 if (ssid == wpa_s->prev_scan_ssid) { 551 ssid = ssid->next; 552 break; 553 } 554 ssid = ssid->next; 555 } 556 } 557 558 if (scan_req != 2 && wpa_s->conf->ap_scan == 2) { 559 wpa_s->connect_without_scan = NULL; 560 wpa_s->prev_scan_wildcard = 0; 561 wpa_supplicant_assoc_try(wpa_s, ssid); 562 return; 563#ifndef ANDROID 564 } else if (wpa_s->conf->ap_scan == 2) { 565 /* 566 * User-initiated scan request in ap_scan == 2; scan with 567 * wildcard SSID. 568 */ 569 ssid = NULL; 570#endif 571 } else { 572 struct wpa_ssid *start = ssid, *tssid; 573 int freqs_set = 0; 574 if (ssid == NULL && max_ssids > 1) 575 ssid = wpa_s->conf->ssid; 576 while (ssid) { 577 if (!wpas_network_disabled(wpa_s, ssid) && 578 ssid->scan_ssid) { 579 wpa_hexdump_ascii(MSG_DEBUG, "Scan SSID", 580 ssid->ssid, ssid->ssid_len); 581 params.ssids[params.num_ssids].ssid = 582 ssid->ssid; 583 params.ssids[params.num_ssids].ssid_len = 584 ssid->ssid_len; 585 params.num_ssids++; 586 if (params.num_ssids + 1 >= max_ssids) 587 break; 588 } 589 ssid = ssid->next; 590 if (ssid == start) 591 break; 592 if (ssid == NULL && max_ssids > 1 && 593 start != wpa_s->conf->ssid) 594 ssid = wpa_s->conf->ssid; 595 } 596 597 for (tssid = wpa_s->conf->ssid; tssid; tssid = tssid->next) { 598 if (wpas_network_disabled(wpa_s, tssid)) 599 continue; 600 if ((params.freqs || !freqs_set) && tssid->scan_freq) { 601 int_array_concat(¶ms.freqs, 602 tssid->scan_freq); 603 } else { 604 os_free(params.freqs); 605 params.freqs = NULL; 606 } 607 freqs_set = 1; 608 } 609 int_array_sort_unique(params.freqs); 610 } 611 612 if (ssid && max_ssids == 1) { 613 /* 614 * If the driver is limited to 1 SSID at a time interleave 615 * wildcard SSID scans with specific SSID scans to avoid 616 * waiting a long time for a wildcard scan. 617 */ 618 if (!wpa_s->prev_scan_wildcard) { 619 params.ssids[0].ssid = NULL; 620 params.ssids[0].ssid_len = 0; 621 wpa_s->prev_scan_wildcard = 1; 622 wpa_dbg(wpa_s, MSG_DEBUG, "Starting AP scan for " 623 "wildcard SSID (Interleave with specific)"); 624 } else { 625 wpa_s->prev_scan_ssid = ssid; 626 wpa_s->prev_scan_wildcard = 0; 627 wpa_dbg(wpa_s, MSG_DEBUG, 628 "Starting AP scan for specific SSID: %s", 629 wpa_ssid_txt(ssid->ssid, ssid->ssid_len)); 630 } 631 } else if (ssid) { 632 /* max_ssids > 1 */ 633 634 wpa_s->prev_scan_ssid = ssid; 635 wpa_dbg(wpa_s, MSG_DEBUG, "Include wildcard SSID in " 636 "the scan request"); 637 params.num_ssids++; 638 } else { 639 wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN; 640 params.num_ssids++; 641 wpa_dbg(wpa_s, MSG_DEBUG, "Starting AP scan for wildcard " 642 "SSID"); 643 } 644#ifdef CONFIG_P2P 645ssid_list_set: 646#endif /* CONFIG_P2P */ 647 648 wpa_supplicant_optimize_freqs(wpa_s, ¶ms); 649 extra_ie = wpa_supplicant_extra_ies(wpa_s); 650 651#ifdef CONFIG_HS20 652 if (wpa_s->conf->hs20 && wpabuf_resize(&extra_ie, 6) == 0) 653 wpas_hs20_add_indication(extra_ie); 654#endif /* CONFIG_HS20 */ 655 656 if (params.freqs == NULL && wpa_s->next_scan_freqs) { 657 wpa_dbg(wpa_s, MSG_DEBUG, "Optimize scan based on previously " 658 "generated frequency list"); 659 params.freqs = wpa_s->next_scan_freqs; 660 } else 661 os_free(wpa_s->next_scan_freqs); 662 wpa_s->next_scan_freqs = NULL; 663 664 params.filter_ssids = wpa_supplicant_build_filter_ssids( 665 wpa_s->conf, ¶ms.num_filter_ssids); 666 if (extra_ie) { 667 params.extra_ies = wpabuf_head(extra_ie); 668 params.extra_ies_len = wpabuf_len(extra_ie); 669 } 670 671#ifdef CONFIG_P2P 672 if (wpa_s->p2p_in_provisioning || 673 (wpa_s->show_group_started && wpa_s->go_params)) { 674 /* 675 * The interface may not yet be in P2P mode, so we have to 676 * explicitly request P2P probe to disable CCK rates. 677 */ 678 params.p2p_probe = 1; 679 } 680#endif /* CONFIG_P2P */ 681 682 scan_params = ¶ms; 683 684scan: 685 ret = wpa_supplicant_trigger_scan(wpa_s, scan_params); 686 687 wpabuf_free(extra_ie); 688 os_free(params.freqs); 689 os_free(params.filter_ssids); 690 691 if (ret) { 692 wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate AP scan"); 693 if (prev_state != wpa_s->wpa_state) 694 wpa_supplicant_set_state(wpa_s, prev_state); 695 wpa_supplicant_req_scan(wpa_s, 1, 0); 696 } 697} 698 699 700/** 701 * wpa_supplicant_req_scan - Schedule a scan for neighboring access points 702 * @wpa_s: Pointer to wpa_supplicant data 703 * @sec: Number of seconds after which to scan 704 * @usec: Number of microseconds after which to scan 705 * 706 * This function is used to schedule a scan for neighboring access points after 707 * the specified time. 708 */ 709void wpa_supplicant_req_scan(struct wpa_supplicant *wpa_s, int sec, int usec) 710{ 711#ifndef ANDROID 712 /* If there's at least one network that should be specifically scanned 713 * then don't cancel the scan and reschedule. Some drivers do 714 * background scanning which generates frequent scan results, and that 715 * causes the specific SSID scan to get continually pushed back and 716 * never happen, which causes hidden APs to never get probe-scanned. 717 */ 718 if (eloop_is_timeout_registered(wpa_supplicant_scan, wpa_s, NULL) && 719 wpa_s->conf->ap_scan == 1) { 720 struct wpa_ssid *ssid = wpa_s->conf->ssid; 721 722 while (ssid) { 723 if (!wpas_network_disabled(wpa_s, ssid) && 724 ssid->scan_ssid) 725 break; 726 ssid = ssid->next; 727 } 728 if (ssid) { 729 wpa_dbg(wpa_s, MSG_DEBUG, "Not rescheduling scan to " 730 "ensure that specific SSID scans occur"); 731 return; 732 } 733 } 734#endif 735 wpa_dbg(wpa_s, MSG_DEBUG, "Setting scan request: %d sec %d usec", 736 sec, usec); 737 eloop_cancel_timeout(wpa_supplicant_scan, wpa_s, NULL); 738 eloop_register_timeout(sec, usec, wpa_supplicant_scan, wpa_s, NULL); 739} 740 741 742/** 743 * wpa_supplicant_delayed_sched_scan - Request a delayed scheduled scan 744 * @wpa_s: Pointer to wpa_supplicant data 745 * @sec: Number of seconds after which to scan 746 * @usec: Number of microseconds after which to scan 747 * 748 * This function is used to schedule periodic scans for neighboring 749 * access points after the specified time. 750 */ 751int wpa_supplicant_delayed_sched_scan(struct wpa_supplicant *wpa_s, 752 int sec, int usec) 753{ 754 if (!wpa_s->sched_scan_supported) 755 return -1; 756 757 eloop_register_timeout(sec, usec, 758 wpa_supplicant_delayed_sched_scan_timeout, 759 wpa_s, NULL); 760 761 return 0; 762} 763 764 765/** 766 * wpa_supplicant_req_sched_scan - Start a periodic scheduled scan 767 * @wpa_s: Pointer to wpa_supplicant data 768 * 769 * This function is used to schedule periodic scans for neighboring 770 * access points repeating the scan continuously. 771 */ 772int wpa_supplicant_req_sched_scan(struct wpa_supplicant *wpa_s) 773{ 774 struct wpa_driver_scan_params params; 775 struct wpa_driver_scan_params *scan_params; 776 enum wpa_states prev_state; 777 struct wpa_ssid *ssid = NULL; 778 struct wpabuf *extra_ie = NULL; 779 int ret; 780 unsigned int max_sched_scan_ssids; 781 int wildcard = 0; 782 int need_ssids; 783 784 if (!wpa_s->sched_scan_supported) 785 return -1; 786 787 if (wpa_s->max_sched_scan_ssids > WPAS_MAX_SCAN_SSIDS) 788 max_sched_scan_ssids = WPAS_MAX_SCAN_SSIDS; 789 else 790 max_sched_scan_ssids = wpa_s->max_sched_scan_ssids; 791 if (max_sched_scan_ssids < 1 || wpa_s->conf->disable_scan_offload) 792 return -1; 793 794 if (wpa_s->sched_scanning) { 795 wpa_dbg(wpa_s, MSG_DEBUG, "Already sched scanning"); 796 return 0; 797 } 798 799 need_ssids = 0; 800 for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) { 801 if (!wpas_network_disabled(wpa_s, ssid) && !ssid->scan_ssid) { 802 /* Use wildcard SSID to find this network */ 803 wildcard = 1; 804 } else if (!wpas_network_disabled(wpa_s, ssid) && 805 ssid->ssid_len) 806 need_ssids++; 807 808#ifdef CONFIG_WPS 809 if (!wpas_network_disabled(wpa_s, ssid) && 810 ssid->key_mgmt == WPA_KEY_MGMT_WPS) { 811 /* 812 * Normal scan is more reliable and faster for WPS 813 * operations and since these are for short periods of 814 * time, the benefit of trying to use sched_scan would 815 * be limited. 816 */ 817 wpa_dbg(wpa_s, MSG_DEBUG, "Use normal scan instead of " 818 "sched_scan for WPS"); 819 return -1; 820 } 821#endif /* CONFIG_WPS */ 822 } 823 if (wildcard) 824 need_ssids++; 825 826 if (wpa_s->normal_scans < 3 && 827 (need_ssids <= wpa_s->max_scan_ssids || 828 wpa_s->max_scan_ssids >= (int) max_sched_scan_ssids)) { 829 /* 830 * When normal scan can speed up operations, use that for the 831 * first operations before starting the sched_scan to allow 832 * user space sleep more. We do this only if the normal scan 833 * has functionality that is suitable for this or if the 834 * sched_scan does not have better support for multiple SSIDs. 835 */ 836 wpa_dbg(wpa_s, MSG_DEBUG, "Use normal scan instead of " 837 "sched_scan for initial scans (normal_scans=%d)", 838 wpa_s->normal_scans); 839 return -1; 840 } 841 842 os_memset(¶ms, 0, sizeof(params)); 843 844 /* If we can't allocate space for the filters, we just don't filter */ 845 params.filter_ssids = os_zalloc(wpa_s->max_match_sets * 846 sizeof(struct wpa_driver_scan_filter)); 847 848 prev_state = wpa_s->wpa_state; 849#ifndef ANDROID_P2P 850 if (wpa_s->wpa_state == WPA_DISCONNECTED || 851 wpa_s->wpa_state == WPA_INACTIVE) 852 wpa_supplicant_set_state(wpa_s, WPA_SCANNING); 853#endif 854 855 if (wpa_s->autoscan_params != NULL) { 856 scan_params = wpa_s->autoscan_params; 857 goto scan; 858 } 859 860 /* Find the starting point from which to continue scanning */ 861 ssid = wpa_s->conf->ssid; 862 if (wpa_s->prev_sched_ssid) { 863 while (ssid) { 864 if (ssid == wpa_s->prev_sched_ssid) { 865 ssid = ssid->next; 866 break; 867 } 868 ssid = ssid->next; 869 } 870 } 871 872 if (!ssid || !wpa_s->prev_sched_ssid) { 873 wpa_dbg(wpa_s, MSG_DEBUG, "Beginning of SSID list"); 874 875 if (wpa_s->sched_scan_interval == 0) 876 wpa_s->sched_scan_interval = 10; 877 wpa_s->sched_scan_timeout = max_sched_scan_ssids * 2; 878 wpa_s->first_sched_scan = 1; 879 ssid = wpa_s->conf->ssid; 880 wpa_s->prev_sched_ssid = ssid; 881 } 882 883 if (wildcard) { 884 wpa_dbg(wpa_s, MSG_DEBUG, "Add wildcard SSID to sched_scan"); 885 params.num_ssids++; 886 } 887 888 while (ssid) { 889 if (wpas_network_disabled(wpa_s, ssid)) 890 goto next; 891 892 if (params.num_filter_ssids < wpa_s->max_match_sets && 893 params.filter_ssids && ssid->ssid && ssid->ssid_len) { 894 wpa_dbg(wpa_s, MSG_DEBUG, "add to filter ssid: %s", 895 wpa_ssid_txt(ssid->ssid, ssid->ssid_len)); 896 os_memcpy(params.filter_ssids[params.num_filter_ssids].ssid, 897 ssid->ssid, ssid->ssid_len); 898 params.filter_ssids[params.num_filter_ssids].ssid_len = 899 ssid->ssid_len; 900 params.num_filter_ssids++; 901 } else if (params.filter_ssids && ssid->ssid && ssid->ssid_len) 902 { 903 wpa_dbg(wpa_s, MSG_DEBUG, "Not enough room for SSID " 904 "filter for sched_scan - drop filter"); 905 os_free(params.filter_ssids); 906 params.filter_ssids = NULL; 907 params.num_filter_ssids = 0; 908 } 909 910 if (ssid->scan_ssid && ssid->ssid && ssid->ssid_len) { 911 if (params.num_ssids == max_sched_scan_ssids) 912 break; /* only room for broadcast SSID */ 913 wpa_dbg(wpa_s, MSG_DEBUG, 914 "add to active scan ssid: %s", 915 wpa_ssid_txt(ssid->ssid, ssid->ssid_len)); 916 params.ssids[params.num_ssids].ssid = 917 ssid->ssid; 918 params.ssids[params.num_ssids].ssid_len = 919 ssid->ssid_len; 920 params.num_ssids++; 921 if (params.num_ssids >= max_sched_scan_ssids) { 922 wpa_s->prev_sched_ssid = ssid; 923 do { 924 ssid = ssid->next; 925 } while (ssid && 926 (wpas_network_disabled(wpa_s, ssid) || 927 !ssid->scan_ssid)); 928 break; 929 } 930 } 931 932 next: 933 wpa_s->prev_sched_ssid = ssid; 934 ssid = ssid->next; 935 } 936 937 if (params.num_filter_ssids == 0) { 938 os_free(params.filter_ssids); 939 params.filter_ssids = NULL; 940 } 941 942 extra_ie = wpa_supplicant_extra_ies(wpa_s); 943 if (extra_ie) { 944 params.extra_ies = wpabuf_head(extra_ie); 945 params.extra_ies_len = wpabuf_len(extra_ie); 946 } 947 948 scan_params = ¶ms; 949 950scan: 951 if (ssid || !wpa_s->first_sched_scan) { 952 wpa_dbg(wpa_s, MSG_DEBUG, 953 "Starting sched scan: interval %d timeout %d", 954 wpa_s->sched_scan_interval, wpa_s->sched_scan_timeout); 955 } else { 956 wpa_dbg(wpa_s, MSG_DEBUG, 957 "Starting sched scan: interval %d (no timeout)", 958 wpa_s->sched_scan_interval); 959 } 960 961 ret = wpa_supplicant_start_sched_scan(wpa_s, scan_params, 962 wpa_s->sched_scan_interval); 963 wpabuf_free(extra_ie); 964 os_free(params.filter_ssids); 965 if (ret) { 966 wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate sched scan"); 967 if (prev_state != wpa_s->wpa_state) 968 wpa_supplicant_set_state(wpa_s, prev_state); 969 return ret; 970 } 971 972 /* If we have more SSIDs to scan, add a timeout so we scan them too */ 973 if (ssid || !wpa_s->first_sched_scan) { 974 wpa_s->sched_scan_timed_out = 0; 975 eloop_register_timeout(wpa_s->sched_scan_timeout, 0, 976 wpa_supplicant_sched_scan_timeout, 977 wpa_s, NULL); 978 wpa_s->first_sched_scan = 0; 979 wpa_s->sched_scan_timeout /= 2; 980 wpa_s->sched_scan_interval *= 2; 981 } 982 983 return 0; 984} 985 986 987/** 988 * wpa_supplicant_cancel_scan - Cancel a scheduled scan request 989 * @wpa_s: Pointer to wpa_supplicant data 990 * 991 * This function is used to cancel a scan request scheduled with 992 * wpa_supplicant_req_scan(). 993 */ 994void wpa_supplicant_cancel_scan(struct wpa_supplicant *wpa_s) 995{ 996 wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling scan request"); 997 eloop_cancel_timeout(wpa_supplicant_scan, wpa_s, NULL); 998#ifdef ANDROID 999 wpa_supplicant_notify_scanning(wpa_s, 0); 1000#endif 1001} 1002 1003 1004/** 1005 * wpa_supplicant_cancel_sched_scan - Stop running scheduled scans 1006 * @wpa_s: Pointer to wpa_supplicant data 1007 * 1008 * This function is used to stop a periodic scheduled scan. 1009 */ 1010void wpa_supplicant_cancel_sched_scan(struct wpa_supplicant *wpa_s) 1011{ 1012 if (!wpa_s->sched_scanning) 1013 return; 1014 1015 wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling sched scan"); 1016 eloop_cancel_timeout(wpa_supplicant_sched_scan_timeout, wpa_s, NULL); 1017 wpa_supplicant_stop_sched_scan(wpa_s); 1018} 1019 1020 1021void wpa_supplicant_notify_scanning(struct wpa_supplicant *wpa_s, 1022 int scanning) 1023{ 1024 if (wpa_s->scanning != scanning) { 1025#ifdef ANDROID_P2P 1026 if(!wpa_s->sched_scanning) 1027 wpa_s->scanning = scanning; 1028#else 1029 wpa_s->scanning = scanning; 1030#endif 1031 wpas_notify_scanning(wpa_s); 1032 } 1033} 1034 1035 1036static int wpa_scan_get_max_rate(const struct wpa_scan_res *res) 1037{ 1038 int rate = 0; 1039 const u8 *ie; 1040 int i; 1041 1042 ie = wpa_scan_get_ie(res, WLAN_EID_SUPP_RATES); 1043 for (i = 0; ie && i < ie[1]; i++) { 1044 if ((ie[i + 2] & 0x7f) > rate) 1045 rate = ie[i + 2] & 0x7f; 1046 } 1047 1048 ie = wpa_scan_get_ie(res, WLAN_EID_EXT_SUPP_RATES); 1049 for (i = 0; ie && i < ie[1]; i++) { 1050 if ((ie[i + 2] & 0x7f) > rate) 1051 rate = ie[i + 2] & 0x7f; 1052 } 1053 1054 return rate; 1055} 1056 1057 1058const u8 * wpa_scan_get_ie(const struct wpa_scan_res *res, u8 ie) 1059{ 1060 const u8 *end, *pos; 1061 1062 pos = (const u8 *) (res + 1); 1063 end = pos + res->ie_len; 1064 1065 while (pos + 1 < end) { 1066 if (pos + 2 + pos[1] > end) 1067 break; 1068 if (pos[0] == ie) 1069 return pos; 1070 pos += 2 + pos[1]; 1071 } 1072 1073 return NULL; 1074} 1075 1076 1077const u8 * wpa_scan_get_vendor_ie(const struct wpa_scan_res *res, 1078 u32 vendor_type) 1079{ 1080 const u8 *end, *pos; 1081 1082 pos = (const u8 *) (res + 1); 1083 end = pos + res->ie_len; 1084 1085 while (pos + 1 < end) { 1086 if (pos + 2 + pos[1] > end) 1087 break; 1088 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 && 1089 vendor_type == WPA_GET_BE32(&pos[2])) 1090 return pos; 1091 pos += 2 + pos[1]; 1092 } 1093 1094 return NULL; 1095} 1096 1097 1098struct wpabuf * wpa_scan_get_vendor_ie_multi(const struct wpa_scan_res *res, 1099 u32 vendor_type) 1100{ 1101 struct wpabuf *buf; 1102 const u8 *end, *pos; 1103 1104 buf = wpabuf_alloc(res->ie_len); 1105 if (buf == NULL) 1106 return NULL; 1107 1108 pos = (const u8 *) (res + 1); 1109 end = pos + res->ie_len; 1110 1111 while (pos + 1 < end) { 1112 if (pos + 2 + pos[1] > end) 1113 break; 1114 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 && 1115 vendor_type == WPA_GET_BE32(&pos[2])) 1116 wpabuf_put_data(buf, pos + 2 + 4, pos[1] - 4); 1117 pos += 2 + pos[1]; 1118 } 1119 1120 if (wpabuf_len(buf) == 0) { 1121 wpabuf_free(buf); 1122 buf = NULL; 1123 } 1124 1125 return buf; 1126} 1127 1128 1129struct wpabuf * wpa_scan_get_vendor_ie_multi_beacon( 1130 const struct wpa_scan_res *res, u32 vendor_type) 1131{ 1132 struct wpabuf *buf; 1133 const u8 *end, *pos; 1134 1135 if (res->beacon_ie_len == 0) 1136 return NULL; 1137 buf = wpabuf_alloc(res->beacon_ie_len); 1138 if (buf == NULL) 1139 return NULL; 1140 1141 pos = (const u8 *) (res + 1); 1142 pos += res->ie_len; 1143 end = pos + res->beacon_ie_len; 1144 1145 while (pos + 1 < end) { 1146 if (pos + 2 + pos[1] > end) 1147 break; 1148 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 && 1149 vendor_type == WPA_GET_BE32(&pos[2])) 1150 wpabuf_put_data(buf, pos + 2 + 4, pos[1] - 4); 1151 pos += 2 + pos[1]; 1152 } 1153 1154 if (wpabuf_len(buf) == 0) { 1155 wpabuf_free(buf); 1156 buf = NULL; 1157 } 1158 1159 return buf; 1160} 1161 1162 1163/* 1164 * Channels with a great SNR can operate at full rate. What is a great SNR? 1165 * This doc https://supportforums.cisco.com/docs/DOC-12954 says, "the general 1166 * rule of thumb is that any SNR above 20 is good." This one 1167 * http://www.cisco.com/en/US/tech/tk722/tk809/technologies_q_and_a_item09186a00805e9a96.shtml#qa23 1168 * recommends 25 as a minimum SNR for 54 Mbps data rate. 30 is chosen here as a 1169 * conservative value. 1170 */ 1171#define GREAT_SNR 30 1172 1173/* Compare function for sorting scan results. Return >0 if @b is considered 1174 * better. */ 1175static int wpa_scan_result_compar(const void *a, const void *b) 1176{ 1177#define IS_5GHZ(n) (n > 4000) 1178#define MIN(a,b) a < b ? a : b 1179 struct wpa_scan_res **_wa = (void *) a; 1180 struct wpa_scan_res **_wb = (void *) b; 1181 struct wpa_scan_res *wa = *_wa; 1182 struct wpa_scan_res *wb = *_wb; 1183 int wpa_a, wpa_b, maxrate_a, maxrate_b; 1184 int snr_a, snr_b; 1185 1186 /* WPA/WPA2 support preferred */ 1187 wpa_a = wpa_scan_get_vendor_ie(wa, WPA_IE_VENDOR_TYPE) != NULL || 1188 wpa_scan_get_ie(wa, WLAN_EID_RSN) != NULL; 1189 wpa_b = wpa_scan_get_vendor_ie(wb, WPA_IE_VENDOR_TYPE) != NULL || 1190 wpa_scan_get_ie(wb, WLAN_EID_RSN) != NULL; 1191 1192 if (wpa_b && !wpa_a) 1193 return 1; 1194 if (!wpa_b && wpa_a) 1195 return -1; 1196 1197 /* privacy support preferred */ 1198 if ((wa->caps & IEEE80211_CAP_PRIVACY) == 0 && 1199 (wb->caps & IEEE80211_CAP_PRIVACY)) 1200 return 1; 1201 if ((wa->caps & IEEE80211_CAP_PRIVACY) && 1202 (wb->caps & IEEE80211_CAP_PRIVACY) == 0) 1203 return -1; 1204 1205 if ((wa->flags & wb->flags & WPA_SCAN_LEVEL_DBM) && 1206 !((wa->flags | wb->flags) & WPA_SCAN_NOISE_INVALID)) { 1207 snr_a = MIN(wa->level - wa->noise, GREAT_SNR); 1208 snr_b = MIN(wb->level - wb->noise, GREAT_SNR); 1209 } else { 1210 /* Not suitable information to calculate SNR, so use level */ 1211 snr_a = wa->level; 1212 snr_b = wb->level; 1213 } 1214 1215 /* best/max rate preferred if SNR close enough */ 1216 if ((snr_a && snr_b && abs(snr_b - snr_a) < 5) || 1217 (wa->qual && wb->qual && abs(wb->qual - wa->qual) < 10)) { 1218 maxrate_a = wpa_scan_get_max_rate(wa); 1219 maxrate_b = wpa_scan_get_max_rate(wb); 1220 if (maxrate_a != maxrate_b) 1221 return maxrate_b - maxrate_a; 1222 if (IS_5GHZ(wa->freq) ^ IS_5GHZ(wb->freq)) 1223 return IS_5GHZ(wa->freq) ? -1 : 1; 1224 } 1225 1226 /* use freq for channel preference */ 1227 1228 /* all things being equal, use SNR; if SNRs are 1229 * identical, use quality values since some drivers may only report 1230 * that value and leave the signal level zero */ 1231 if (snr_b == snr_a) 1232 return wb->qual - wa->qual; 1233 return snr_b - snr_a; 1234#undef MIN 1235#undef IS_5GHZ 1236} 1237 1238 1239#ifdef CONFIG_WPS 1240/* Compare function for sorting scan results when searching a WPS AP for 1241 * provisioning. Return >0 if @b is considered better. */ 1242static int wpa_scan_result_wps_compar(const void *a, const void *b) 1243{ 1244 struct wpa_scan_res **_wa = (void *) a; 1245 struct wpa_scan_res **_wb = (void *) b; 1246 struct wpa_scan_res *wa = *_wa; 1247 struct wpa_scan_res *wb = *_wb; 1248 int uses_wps_a, uses_wps_b; 1249 struct wpabuf *wps_a, *wps_b; 1250 int res; 1251 1252 /* Optimization - check WPS IE existence before allocated memory and 1253 * doing full reassembly. */ 1254 uses_wps_a = wpa_scan_get_vendor_ie(wa, WPS_IE_VENDOR_TYPE) != NULL; 1255 uses_wps_b = wpa_scan_get_vendor_ie(wb, WPS_IE_VENDOR_TYPE) != NULL; 1256 if (uses_wps_a && !uses_wps_b) 1257 return -1; 1258 if (!uses_wps_a && uses_wps_b) 1259 return 1; 1260 1261 if (uses_wps_a && uses_wps_b) { 1262 wps_a = wpa_scan_get_vendor_ie_multi(wa, WPS_IE_VENDOR_TYPE); 1263 wps_b = wpa_scan_get_vendor_ie_multi(wb, WPS_IE_VENDOR_TYPE); 1264 res = wps_ap_priority_compar(wps_a, wps_b); 1265 wpabuf_free(wps_a); 1266 wpabuf_free(wps_b); 1267 if (res) 1268 return res; 1269 } 1270 1271 /* 1272 * Do not use current AP security policy as a sorting criteria during 1273 * WPS provisioning step since the AP may get reconfigured at the 1274 * completion of provisioning. 1275 */ 1276 1277 /* all things being equal, use signal level; if signal levels are 1278 * identical, use quality values since some drivers may only report 1279 * that value and leave the signal level zero */ 1280 if (wb->level == wa->level) 1281 return wb->qual - wa->qual; 1282 return wb->level - wa->level; 1283} 1284#endif /* CONFIG_WPS */ 1285 1286 1287static void dump_scan_res(struct wpa_scan_results *scan_res) 1288{ 1289#ifndef CONFIG_NO_STDOUT_DEBUG 1290 size_t i; 1291 1292 if (scan_res->res == NULL || scan_res->num == 0) 1293 return; 1294 1295 wpa_printf(MSG_EXCESSIVE, "Sorted scan results"); 1296 1297 for (i = 0; i < scan_res->num; i++) { 1298 struct wpa_scan_res *r = scan_res->res[i]; 1299 u8 *pos; 1300 if ((r->flags & (WPA_SCAN_LEVEL_DBM | WPA_SCAN_NOISE_INVALID)) 1301 == WPA_SCAN_LEVEL_DBM) { 1302 int snr = r->level - r->noise; 1303 wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d " 1304 "noise=%d level=%d snr=%d%s flags=0x%x", 1305 MAC2STR(r->bssid), r->freq, r->qual, 1306 r->noise, r->level, snr, 1307 snr >= GREAT_SNR ? "*" : "", r->flags); 1308 } else { 1309 wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d " 1310 "noise=%d level=%d flags=0x%x", 1311 MAC2STR(r->bssid), r->freq, r->qual, 1312 r->noise, r->level, r->flags); 1313 } 1314 pos = (u8 *) (r + 1); 1315 if (r->ie_len) 1316 wpa_hexdump(MSG_EXCESSIVE, "IEs", pos, r->ie_len); 1317 pos += r->ie_len; 1318 if (r->beacon_ie_len) 1319 wpa_hexdump(MSG_EXCESSIVE, "Beacon IEs", 1320 pos, r->beacon_ie_len); 1321 } 1322#endif /* CONFIG_NO_STDOUT_DEBUG */ 1323} 1324 1325 1326int wpa_supplicant_filter_bssid_match(struct wpa_supplicant *wpa_s, 1327 const u8 *bssid) 1328{ 1329 size_t i; 1330 1331 if (wpa_s->bssid_filter == NULL) 1332 return 1; 1333 1334 for (i = 0; i < wpa_s->bssid_filter_count; i++) { 1335 if (os_memcmp(wpa_s->bssid_filter + i * ETH_ALEN, bssid, 1336 ETH_ALEN) == 0) 1337 return 1; 1338 } 1339 1340 return 0; 1341} 1342 1343 1344static void filter_scan_res(struct wpa_supplicant *wpa_s, 1345 struct wpa_scan_results *res) 1346{ 1347 size_t i, j; 1348 1349 if (wpa_s->bssid_filter == NULL) 1350 return; 1351 1352 for (i = 0, j = 0; i < res->num; i++) { 1353 if (wpa_supplicant_filter_bssid_match(wpa_s, 1354 res->res[i]->bssid)) { 1355 res->res[j++] = res->res[i]; 1356 } else { 1357 os_free(res->res[i]); 1358 res->res[i] = NULL; 1359 } 1360 } 1361 1362 if (res->num != j) { 1363 wpa_printf(MSG_DEBUG, "Filtered out %d scan results", 1364 (int) (res->num - j)); 1365 res->num = j; 1366 } 1367} 1368 1369 1370/** 1371 * wpa_supplicant_get_scan_results - Get scan results 1372 * @wpa_s: Pointer to wpa_supplicant data 1373 * @info: Information about what was scanned or %NULL if not available 1374 * @new_scan: Whether a new scan was performed 1375 * Returns: Scan results, %NULL on failure 1376 * 1377 * This function request the current scan results from the driver and updates 1378 * the local BSS list wpa_s->bss. The caller is responsible for freeing the 1379 * results with wpa_scan_results_free(). 1380 */ 1381struct wpa_scan_results * 1382wpa_supplicant_get_scan_results(struct wpa_supplicant *wpa_s, 1383 struct scan_info *info, int new_scan) 1384{ 1385 struct wpa_scan_results *scan_res; 1386 size_t i; 1387 int (*compar)(const void *, const void *) = wpa_scan_result_compar; 1388 1389 scan_res = wpa_drv_get_scan_results2(wpa_s); 1390 if (scan_res == NULL) { 1391 wpa_dbg(wpa_s, MSG_DEBUG, "Failed to get scan results"); 1392 return NULL; 1393 } 1394 filter_scan_res(wpa_s, scan_res); 1395 1396#ifdef CONFIG_WPS 1397 if (wpas_wps_in_progress(wpa_s)) { 1398 wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Order scan results with WPS " 1399 "provisioning rules"); 1400 compar = wpa_scan_result_wps_compar; 1401 } 1402#endif /* CONFIG_WPS */ 1403 1404 qsort(scan_res->res, scan_res->num, sizeof(struct wpa_scan_res *), 1405 compar); 1406 dump_scan_res(scan_res); 1407 1408 wpa_bss_update_start(wpa_s); 1409 for (i = 0; i < scan_res->num; i++) 1410 wpa_bss_update_scan_res(wpa_s, scan_res->res[i]); 1411 wpa_bss_update_end(wpa_s, info, new_scan); 1412 1413 return scan_res; 1414} 1415 1416 1417int wpa_supplicant_update_scan_results(struct wpa_supplicant *wpa_s) 1418{ 1419 struct wpa_scan_results *scan_res; 1420 scan_res = wpa_supplicant_get_scan_results(wpa_s, NULL, 0); 1421 if (scan_res == NULL) 1422 return -1; 1423 wpa_scan_results_free(scan_res); 1424 1425 return 0; 1426} 1427