wpa_supplicant/scan.c

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