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
 242         wpa_supplicant_notify_scanning(wpa_s, 1);
 243         ret = wpa_drv_sched_scan(wpa_s, params, interval * 1000);
 244         if (ret)
 245                 wpa_supplicant_notify_scanning(wpa_s, 0);
 246         else
 247                 wpa_s->sched_scanning = 1;
 248
 249         return ret;
 250 }
 251
 252
 253 static int wpa_supplicant_stop_sched_scan(struct wpa_supplicant *wpa_s)
 254 {
 255         int ret;
 256
 257         ret = wpa_drv_stop_sched_scan(wpa_s);
 258         if (ret) {
 259                 wpa_dbg(wpa_s, MSG_DEBUG, "stopping sched_scan failed!");
 260                 /* TODO: what to do if stopping fails? */
 261                 return -1;
 262         }
 263
 264         return ret;
 265 }
 266
 267
 268 static struct wpa_driver_scan_filter *
 269 wpa_supplicant_build_filter_ssids(struct wpa_config *conf, size_t *num_ssids)
 270 {
 271         struct wpa_driver_scan_filter *ssids;
 272         struct wpa_ssid *ssid;
 273         size_t count;
 274
 275         *num_ssids = 0;
 276         if (!conf->filter_ssids)
 277                 return NULL;
 278
 279         for (count = 0, ssid = conf->ssid; ssid; ssid = ssid->next) {
 280                 if (ssid->ssid && ssid->ssid_len)
 281                         count++;
 282         }
 283         if (count == 0)
 284                 return NULL;
 285         ssids = os_zalloc(count * sizeof(struct wpa_driver_scan_filter));
 286         if (ssids == NULL)
 287                 return NULL;
 288
 289         for (ssid = conf->ssid; ssid; ssid = ssid->next) {
 290                 if (!ssid->ssid || !ssid->ssid_len)
 291                         continue;
 292                 os_memcpy(ssids[*num_ssids].ssid, ssid->ssid, ssid->ssid_len);
 293                 ssids[*num_ssids].ssid_len = ssid->ssid_len;
 294                 (*num_ssids)++;
 295         }
 296
 297         return ssids;
 298 }
 299
 300
 301 static void wpa_supplicant_optimize_freqs(
 302         struct wpa_supplicant *wpa_s, struct wpa_driver_scan_params *params)
 303 {
 304 #ifdef CONFIG_P2P
 305         if (params->freqs == NULL && wpa_s->p2p_in_provisioning &&
 306             wpa_s->go_params) {
 307                 /* Optimize provisioning state scan based on GO information */
 308                 if (wpa_s->p2p_in_provisioning < 5 &&
 309                     wpa_s->go_params->freq > 0) {
 310                         wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only GO "
 311                                 "preferred frequency %d MHz",
 312                                 wpa_s->go_params->freq);
 313                         params->freqs = os_zalloc(2 * sizeof(int));
 314                         if (params->freqs)
 315                                 params->freqs[0] = wpa_s->go_params->freq;
 316                 } else if (wpa_s->p2p_in_provisioning < 8 &&
 317                            wpa_s->go_params->freq_list[0]) {
 318                         wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only common "
 319                                 "channels");
 320                         int_array_concat(&params->freqs,
 321                                          wpa_s->go_params->freq_list);
 322                         if (params->freqs)
 323                                 int_array_sort_unique(params->freqs);
 324                 }
 325                 wpa_s->p2p_in_provisioning++;
 326         }
 327 #endif /* CONFIG_P2P */
 328
 329 #ifdef CONFIG_WPS
 330         if (params->freqs == NULL && wpa_s->after_wps && wpa_s->wps_freq) {
 331                 /*
 332                  * Optimize post-provisioning scan based on channel used
 333                  * during provisioning.
 334                  */
 335                 wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Scan only frequency %u MHz "
 336                         "that was used during provisioning", wpa_s->wps_freq);
 337                 params->freqs = os_zalloc(2 * sizeof(int));
 338                 if (params->freqs)
 339                         params->freqs[0] = wpa_s->wps_freq;
 340                 wpa_s->after_wps--;
 341         }
 342
 343         if (params->freqs == NULL && wpa_s->known_wps_freq && wpa_s->wps_freq)
 344         {
 345                 /* Optimize provisioning scan based on already known channel */
 346                 wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Scan only frequency %u MHz",
 347                         wpa_s->wps_freq);
 348                 params->freqs = os_zalloc(2 * sizeof(int));
 349                 if (params->freqs)
 350                         params->freqs[0] = wpa_s->wps_freq;
 351                 wpa_s->known_wps_freq = 0; /* only do this once */
 352         }
 353 #endif /* CONFIG_WPS */
 354 }
 355
 356
 357 #ifdef CONFIG_INTERWORKING
 358 static void wpas_add_interworking_elements(struct wpa_supplicant *wpa_s,
 359                                            struct wpabuf *buf)
 360 {
 361         if (wpa_s->conf->interworking == 0)
 362                 return;
 363
 364         wpabuf_put_u8(buf, WLAN_EID_EXT_CAPAB);
 365         wpabuf_put_u8(buf, 4);
 366         wpabuf_put_u8(buf, 0x00);
 367         wpabuf_put_u8(buf, 0x00);
 368         wpabuf_put_u8(buf, 0x00);
 369         wpabuf_put_u8(buf, 0x80); /* Bit 31 - Interworking */
 370
 371         wpabuf_put_u8(buf, WLAN_EID_INTERWORKING);
 372         wpabuf_put_u8(buf, is_zero_ether_addr(wpa_s->conf->hessid) ? 1 :
 373                       1 + ETH_ALEN);
 374         wpabuf_put_u8(buf, wpa_s->conf->access_network_type);
 375         /* No Venue Info */
 376         if (!is_zero_ether_addr(wpa_s->conf->hessid))
 377                 wpabuf_put_data(buf, wpa_s->conf->hessid, ETH_ALEN);
 378 }
 379 #endif /* CONFIG_INTERWORKING */
 380
 381
 382 static struct wpabuf *
 383 wpa_supplicant_extra_ies(struct wpa_supplicant *wpa_s,
 384                          struct wpa_driver_scan_params *params)
 385 {
 386         struct wpabuf *extra_ie = NULL;
 387 #ifdef CONFIG_WPS
 388         int wps = 0;
 389         enum wps_request_type req_type = WPS_REQ_ENROLLEE_INFO;
 390 #endif /* CONFIG_WPS */
 391
 392 #ifdef CONFIG_INTERWORKING
 393         if (wpa_s->conf->interworking &&
 394             wpabuf_resize(&extra_ie, 100) == 0)
 395                 wpas_add_interworking_elements(wpa_s, extra_ie);
 396 #endif /* CONFIG_INTERWORKING */
 397
 398 #ifdef CONFIG_WPS
 399         wps = wpas_wps_in_use(wpa_s, &req_type);
 400
 401         if (wps) {
 402                 struct wpabuf *wps_ie;
 403                 wps_ie = wps_build_probe_req_ie(wps == 2, &wpa_s->wps->dev,
 404                                                 wpa_s->wps->uuid, req_type,
 405                                                 0, NULL);
 406                 if (wps_ie) {
 407                         if (wpabuf_resize(&extra_ie, wpabuf_len(wps_ie)) == 0)
 408                                 wpabuf_put_buf(extra_ie, wps_ie);
 409                         wpabuf_free(wps_ie);
 410                 }
 411         }
 412
 413 #ifdef CONFIG_P2P
 414         if (wps) {
 415                 size_t ielen = p2p_scan_ie_buf_len(wpa_s->global->p2p);
 416                 if (wpabuf_resize(&extra_ie, ielen) == 0)
 417                         wpas_p2p_scan_ie(wpa_s, extra_ie);
 418         }
 419 #endif /* CONFIG_P2P */
 420
 421 #endif /* CONFIG_WPS */
 422
 423         return extra_ie;
 424 }
 425
 426
 427 static void wpa_supplicant_scan(void *eloop_ctx, void *timeout_ctx)
 428 {
 429         struct wpa_supplicant *wpa_s = eloop_ctx;
 430         struct wpa_ssid *ssid;
 431         int scan_req = 0, ret;
 432         struct wpabuf *extra_ie;
 433         struct wpa_driver_scan_params params;
 434         size_t max_ssids;
 435         enum wpa_states prev_state;
 436
 437         if (wpa_s->wpa_state == WPA_INTERFACE_DISABLED) {
 438                 wpa_dbg(wpa_s, MSG_DEBUG, "Skip scan - interface disabled");
 439                 return;
 440         }
 441
 442         if (wpa_s->disconnected && !wpa_s->scan_req) {
 443                 wpa_supplicant_set_state(wpa_s, WPA_DISCONNECTED);
 444                 return;
 445         }
 446
 447         if (!wpa_supplicant_enabled_networks(wpa_s->conf) &&
 448             !wpa_s->scan_req) {
 449                 wpa_dbg(wpa_s, MSG_DEBUG, "No enabled networks - do not scan");
 450                 wpa_supplicant_set_state(wpa_s, WPA_INACTIVE);
 451                 return;
 452         }
 453
 454         if (wpa_s->conf->ap_scan != 0 &&
 455             (wpa_s->drv_flags & WPA_DRIVER_FLAGS_WIRED)) {
 456                 wpa_dbg(wpa_s, MSG_DEBUG, "Using wired authentication - "
 457                         "overriding ap_scan configuration");
 458                 wpa_s->conf->ap_scan = 0;
 459                 wpas_notify_ap_scan_changed(wpa_s);
 460         }
 461
 462         if (wpa_s->conf->ap_scan == 0) {
 463                 wpa_supplicant_gen_assoc_event(wpa_s);
 464                 return;
 465         }
 466
 467 #ifdef CONFIG_P2P
 468         if (wpas_p2p_in_progress(wpa_s)) {
 469                 if (wpa_s->wpa_state == WPA_SCANNING) {
 470                         wpa_dbg(wpa_s, MSG_DEBUG, "Delay station mode scan "
 471                                 "while P2P operation is in progress");
 472                         wpa_supplicant_req_scan(wpa_s, 5, 0);
 473                 } else {
 474                         wpa_dbg(wpa_s, MSG_DEBUG, "Do not request scan while "
 475                                 "P2P operation is in progress");
 476                 }
 477                 return;
 478         }
 479 #endif /* CONFIG_P2P */
 480
 481         if (wpa_s->conf->ap_scan == 2)
 482                 max_ssids = 1;
 483         else {
 484                 max_ssids = wpa_s->max_scan_ssids;
 485                 if (max_ssids > WPAS_MAX_SCAN_SSIDS)
 486                         max_ssids = WPAS_MAX_SCAN_SSIDS;
 487         }
 488
 489         scan_req = wpa_s->scan_req;
 490         wpa_s->scan_req = 0;
 491
 492         os_memset(&params, 0, sizeof(params));
 493
 494         prev_state = wpa_s->wpa_state;
 495         if (wpa_s->wpa_state == WPA_DISCONNECTED ||
 496             wpa_s->wpa_state == WPA_INACTIVE)
 497                 wpa_supplicant_set_state(wpa_s, WPA_SCANNING);
 498
 499         if (scan_req != 2 && wpa_s->connect_without_scan) {
 500                 for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
 501                         if (ssid == wpa_s->connect_without_scan)
 502                                 break;
 503                 }
 504                 wpa_s->connect_without_scan = NULL;
 505                 if (ssid) {
 506                         wpa_printf(MSG_DEBUG, "Start a pre-selected network "
 507                                    "without scan step");
 508                         wpa_supplicant_associate(wpa_s, NULL, ssid);
 509                         return;
 510                 }
 511         }
 512
 513         /* Find the starting point from which to continue scanning */
 514         ssid = wpa_s->conf->ssid;
 515         if (wpa_s->prev_scan_ssid != WILDCARD_SSID_SCAN) {
 516                 while (ssid) {
 517                         if (ssid == wpa_s->prev_scan_ssid) {
 518                                 ssid = ssid->next;
 519                                 break;
 520                         }
 521                         ssid = ssid->next;
 522                 }
 523         }
 524
 525         if (scan_req != 2 && wpa_s->conf->ap_scan == 2) {
 526                 wpa_s->connect_without_scan = NULL;
 527                 wpa_s->prev_scan_wildcard = 0;
 528                 wpa_supplicant_assoc_try(wpa_s, ssid);
 529                 return;
 530         } else if (wpa_s->conf->ap_scan == 2) {
 531                 /*
 532                  * User-initiated scan request in ap_scan == 2; scan with
 533                  * wildcard SSID.
 534                  */
 535                 ssid = NULL;
 536         } else {
 537                 struct wpa_ssid *start = ssid, *tssid;
 538                 int freqs_set = 0;
 539                 if (ssid == NULL && max_ssids > 1)
 540                         ssid = wpa_s->conf->ssid;
 541                 while (ssid) {
 542                         if (!ssid->disabled && ssid->scan_ssid) {
 543                                 wpa_hexdump_ascii(MSG_DEBUG, "Scan SSID",
 544                                                   ssid->ssid, ssid->ssid_len);
 545                                 params.ssids[params.num_ssids].ssid =
 546                                         ssid->ssid;
 547                                 params.ssids[params.num_ssids].ssid_len =
 548                                         ssid->ssid_len;
 549                                 params.num_ssids++;
 550                                 if (params.num_ssids + 1 >= max_ssids)
 551                                         break;
 552                         }
 553                         ssid = ssid->next;
 554                         if (ssid == start)
 555                                 break;
 556                         if (ssid == NULL && max_ssids > 1 &&
 557                             start != wpa_s->conf->ssid)
 558                                 ssid = wpa_s->conf->ssid;
 559                 }
 560
 561                 for (tssid = wpa_s->conf->ssid; tssid; tssid = tssid->next) {
 562                         if (tssid->disabled)
 563                                 continue;
 564                         if ((params.freqs || !freqs_set) && tssid->scan_freq) {
 565                                 int_array_concat(&params.freqs,
 566                                                  tssid->scan_freq);
 567                         } else {
 568                                 os_free(params.freqs);
 569                                 params.freqs = NULL;
 570                         }
 571                         freqs_set = 1;
 572                 }
 573                 int_array_sort_unique(params.freqs);
 574         }
 575
 576         if (ssid && max_ssids == 1) {
 577                 /*
 578                  * If the driver is limited to 1 SSID at a time interleave
 579                  * wildcard SSID scans with specific SSID scans to avoid
 580                  * waiting a long time for a wildcard scan.
 581                  */
 582                 if (!wpa_s->prev_scan_wildcard) {
 583                         params.ssids[0].ssid = NULL;
 584                         params.ssids[0].ssid_len = 0;
 585                         wpa_s->prev_scan_wildcard = 1;
 586                         wpa_dbg(wpa_s, MSG_DEBUG, "Starting AP scan for "
 587                                 "wildcard SSID (Interleave with specific)");
 588                 } else {
 589                         wpa_s->prev_scan_ssid = ssid;
 590                         wpa_s->prev_scan_wildcard = 0;
 591                         wpa_dbg(wpa_s, MSG_DEBUG,
 592                                 "Starting AP scan for specific SSID: %s",
 593                                 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
 594                 }
 595         } else if (ssid) {
 596                 /* max_ssids > 1 */
 597
 598                 wpa_s->prev_scan_ssid = ssid;
 599                 wpa_dbg(wpa_s, MSG_DEBUG, "Include wildcard SSID in "
 600                         "the scan request");
 601                 params.num_ssids++;
 602         } else {
 603                 wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
 604                 params.num_ssids++;
 605                 wpa_dbg(wpa_s, MSG_DEBUG, "Starting AP scan for wildcard "
 606                         "SSID");
 607         }
 608
 609         wpa_supplicant_optimize_freqs(wpa_s, &params);
 610         extra_ie = wpa_supplicant_extra_ies(wpa_s, &params);
 611
 612         if (params.freqs == NULL && wpa_s->next_scan_freqs) {
 613                 wpa_dbg(wpa_s, MSG_DEBUG, "Optimize scan based on previously "
 614                         "generated frequency list");
 615                 params.freqs = wpa_s->next_scan_freqs;
 616         } else
 617                 os_free(wpa_s->next_scan_freqs);
 618         wpa_s->next_scan_freqs = NULL;
 619
 620         params.filter_ssids = wpa_supplicant_build_filter_ssids(
 621                 wpa_s->conf, &params.num_filter_ssids);
 622         if (extra_ie) {
 623                 params.extra_ies = wpabuf_head(extra_ie);
 624                 params.extra_ies_len = wpabuf_len(extra_ie);
 625         }
 626
 627 #ifdef CONFIG_P2P
 628         if (wpa_s->p2p_in_provisioning) {
 629                 /*
 630                  * The interface may not yet be in P2P mode, so we have to
 631                  * explicitly request P2P probe to disable CCK rates.
 632                  */
 633                 params.p2p_probe = 1;
 634         }
 635 #endif /* CONFIG_P2P */
 636
 637         ret = wpa_supplicant_trigger_scan(wpa_s, &params);
 638
 639         wpabuf_free(extra_ie);
 640         os_free(params.freqs);
 641         os_free(params.filter_ssids);
 642
 643         if (ret) {
 644                 wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate AP scan");
 645                 if (prev_state != wpa_s->wpa_state)
 646                         wpa_supplicant_set_state(wpa_s, prev_state);
 647                 wpa_supplicant_req_scan(wpa_s, 1, 0);
 648         }
 649 }
 650
 651
 652 /**
 653  * wpa_supplicant_req_scan - Schedule a scan for neighboring access points
 654  * @wpa_s: Pointer to wpa_supplicant data
 655  * @sec: Number of seconds after which to scan
 656  * @usec: Number of microseconds after which to scan
 657  *
 658  * This function is used to schedule a scan for neighboring access points after
 659  * the specified time.
 660  */
 661 void wpa_supplicant_req_scan(struct wpa_supplicant *wpa_s, int sec, int usec)
 662 {
 663         /* If there's at least one network that should be specifically scanned
 664          * then don't cancel the scan and reschedule.  Some drivers do
 665          * background scanning which generates frequent scan results, and that
 666          * causes the specific SSID scan to get continually pushed back and
 667          * never happen, which causes hidden APs to never get probe-scanned.
 668          */
 669         if (eloop_is_timeout_registered(wpa_supplicant_scan, wpa_s, NULL) &&
 670             wpa_s->conf->ap_scan == 1) {
 671                 struct wpa_ssid *ssid = wpa_s->conf->ssid;
 672
 673                 while (ssid) {
 674                         if (!ssid->disabled && ssid->scan_ssid)
 675                                 break;
 676                         ssid = ssid->next;
 677                 }
 678                 if (ssid) {
 679                         wpa_dbg(wpa_s, MSG_DEBUG, "Not rescheduling scan to "
 680                                 "ensure that specific SSID scans occur");
 681                         return;
 682                 }
 683         }
 684
 685         wpa_dbg(wpa_s, MSG_DEBUG, "Setting scan request: %d sec %d usec",
 686                 sec, usec);
 687         eloop_cancel_timeout(wpa_supplicant_scan, wpa_s, NULL);
 688         eloop_register_timeout(sec, usec, wpa_supplicant_scan, wpa_s, NULL);
 689 }
 690
 691
 692 /**
 693  * wpa_supplicant_delayed_sched_scan - Request a delayed scheduled scan
 694  * @wpa_s: Pointer to wpa_supplicant data
 695  * @sec: Number of seconds after which to scan
 696  * @usec: Number of microseconds after which to scan
 697  *
 698  * This function is used to schedule periodic scans for neighboring
 699  * access points after the specified time.
 700  */
 701 int wpa_supplicant_delayed_sched_scan(struct wpa_supplicant *wpa_s,
 702                                       int sec, int usec)
 703 {
 704         if (!wpa_s->sched_scan_supported)
 705                 return -1;
 706
 707         eloop_register_timeout(sec, usec,
 708                                wpa_supplicant_delayed_sched_scan_timeout,
 709                                wpa_s, NULL);
 710
 711         return 0;
 712 }
 713
 714
 715 /**
 716  * wpa_supplicant_req_sched_scan - Start a periodic scheduled scan
 717  * @wpa_s: Pointer to wpa_supplicant data
 718  *
 719  * This function is used to schedule periodic scans for neighboring
 720  * access points repeating the scan continuously.
 721  */
 722 int wpa_supplicant_req_sched_scan(struct wpa_supplicant *wpa_s)
 723 {
 724         struct wpa_driver_scan_params params;
 725         enum wpa_states prev_state;
 726         struct wpa_ssid *ssid;
 727         struct wpabuf *wps_ie = NULL;
 728         int ret;
 729         unsigned int max_sched_scan_ssids;
 730         int wildcard = 0;
 731         int need_ssids;
 732
 733         if (!wpa_s->sched_scan_supported)
 734                 return -1;
 735
 736         if (wpa_s->max_sched_scan_ssids > WPAS_MAX_SCAN_SSIDS)
 737                 max_sched_scan_ssids = WPAS_MAX_SCAN_SSIDS;
 738         else
 739                 max_sched_scan_ssids = wpa_s->max_sched_scan_ssids;
 740         if (max_sched_scan_ssids < 1)
 741                 return -1;
 742
 743         if (wpa_s->sched_scanning) {
 744                 wpa_dbg(wpa_s, MSG_DEBUG, "Already sched scanning");
 745                 return 0;
 746         }
 747
 748         need_ssids = 0;
 749         for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
 750                 if (!ssid->disabled && !ssid->scan_ssid) {
 751                         /* Use wildcard SSID to find this network */
 752                         wildcard = 1;
 753                 } else if (!ssid->disabled && ssid->ssid_len)
 754                         need_ssids++;
 755         }
 756         if (wildcard)
 757                 need_ssids++;
 758
 759         if (wpa_s->normal_scans < 3 &&
 760             (need_ssids <= wpa_s->max_scan_ssids ||
 761              wpa_s->max_scan_ssids >= (int) max_sched_scan_ssids)) {
 762                 /*
 763                  * When normal scan can speed up operations, use that for the
 764                  * first operations before starting the sched_scan to allow
 765                  * user space sleep more. We do this only if the normal scan
 766                  * has functionality that is suitable for this or if the
 767                  * sched_scan does not have better support for multiple SSIDs.
 768                  */
 769                 wpa_dbg(wpa_s, MSG_DEBUG, "Use normal scan instead of "
 770                         "sched_scan for initial scans (normal_scans=%d)",
 771                         wpa_s->normal_scans);
 772                 return -1;
 773         }
 774
 775         os_memset(&params, 0, sizeof(params));
 776
 777         /* If we can't allocate space for the filters, we just don't filter */
 778         params.filter_ssids = os_zalloc(wpa_s->max_match_sets *
 779                                         sizeof(struct wpa_driver_scan_filter));
 780
 781         prev_state = wpa_s->wpa_state;
 782         if (wpa_s->wpa_state == WPA_DISCONNECTED ||
 783             wpa_s->wpa_state == WPA_INACTIVE)
 784                 wpa_supplicant_set_state(wpa_s, WPA_SCANNING);
 785
 786         /* Find the starting point from which to continue scanning */
 787         ssid = wpa_s->conf->ssid;
 788         if (wpa_s->prev_sched_ssid) {
 789                 while (ssid) {
 790                         if (ssid == wpa_s->prev_sched_ssid) {
 791                                 ssid = ssid->next;
 792                                 break;
 793                         }
 794                         ssid = ssid->next;
 795                 }
 796         }
 797
 798         if (!ssid || !wpa_s->prev_sched_ssid) {
 799                 wpa_dbg(wpa_s, MSG_DEBUG, "Beginning of SSID list");
 800
 801                 wpa_s->sched_scan_interval = 10;
 802                 wpa_s->sched_scan_timeout = max_sched_scan_ssids * 2;
 803                 wpa_s->first_sched_scan = 1;
 804                 ssid = wpa_s->conf->ssid;
 805                 wpa_s->prev_sched_ssid = ssid;
 806         }
 807
 808         if (wildcard) {
 809                 wpa_dbg(wpa_s, MSG_DEBUG, "Add wildcard SSID to sched_scan");
 810                 params.num_ssids++;
 811         }
 812
 813         while (ssid) {
 814                 if (ssid->disabled)
 815                         goto next;
 816
 817                 if (params.num_filter_ssids < wpa_s->max_match_sets &&
 818                     params.filter_ssids && ssid->ssid && ssid->ssid_len) {
 819                         wpa_dbg(wpa_s, MSG_DEBUG, "add to filter ssid: %s",
 820                                 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
 821                         os_memcpy(params.filter_ssids[params.num_filter_ssids].ssid,
 822                                   ssid->ssid, ssid->ssid_len);
 823                         params.filter_ssids[params.num_filter_ssids].ssid_len =
 824                                 ssid->ssid_len;
 825                         params.num_filter_ssids++;
 826                 } else if (params.filter_ssids && ssid->ssid && ssid->ssid_len)
 827                 {
 828                         wpa_dbg(wpa_s, MSG_DEBUG, "Not enough room for SSID "
 829                                 "filter for sched_scan - drop filter");
 830                         os_free(params.filter_ssids);
 831                         params.filter_ssids = NULL;
 832                         params.num_filter_ssids = 0;
 833                 }
 834
 835                 if (ssid->scan_ssid && ssid->ssid && ssid->ssid_len) {
 836                         if (params.num_ssids == max_sched_scan_ssids)
 837                                 break; /* only room for broadcast SSID */
 838                         wpa_dbg(wpa_s, MSG_DEBUG,
 839                                 "add to active scan ssid: %s",
 840                                 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
 841                         params.ssids[params.num_ssids].ssid =
 842                                 ssid->ssid;
 843                         params.ssids[params.num_ssids].ssid_len =
 844                                 ssid->ssid_len;
 845                         params.num_ssids++;
 846                         if (params.num_ssids >= max_sched_scan_ssids) {
 847                                 wpa_s->prev_sched_ssid = ssid;
 848                                 break;
 849                         }
 850                 }
 851
 852         next:
 853                 wpa_s->prev_sched_ssid = ssid;
 854                 ssid = ssid->next;
 855         }
 856
 857         if (params.num_filter_ssids == 0) {
 858                 os_free(params.filter_ssids);
 859                 params.filter_ssids = NULL;
 860         }
 861
 862         if (wpa_s->wps)
 863                 wps_ie = wpa_supplicant_extra_ies(wpa_s, &params);
 864
 865         if (ssid || !wpa_s->first_sched_scan) {
 866                 wpa_dbg(wpa_s, MSG_DEBUG,
 867                         "Starting sched scan: interval %d (no timeout)",
 868                         wpa_s->sched_scan_interval);
 869         } else {
 870                 wpa_dbg(wpa_s, MSG_DEBUG,
 871                         "Starting sched scan: interval %d timeout %d",
 872                         wpa_s->sched_scan_interval, wpa_s->sched_scan_timeout);
 873         }
 874
 875         ret = wpa_supplicant_start_sched_scan(wpa_s, &params,
 876                                               wpa_s->sched_scan_interval);
 877         wpabuf_free(wps_ie);
 878         os_free(params.filter_ssids);
 879         if (ret) {
 880                 wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate sched scan");
 881                 if (prev_state != wpa_s->wpa_state)
 882                         wpa_supplicant_set_state(wpa_s, prev_state);
 883                 return ret;
 884         }
 885
 886         /* If we have more SSIDs to scan, add a timeout so we scan them too */
 887         if (ssid || !wpa_s->first_sched_scan) {
 888                 wpa_s->sched_scan_timed_out = 0;
 889                 eloop_register_timeout(wpa_s->sched_scan_timeout, 0,
 890                                        wpa_supplicant_sched_scan_timeout,
 891                                        wpa_s, NULL);
 892                 wpa_s->first_sched_scan = 0;
 893                 wpa_s->sched_scan_timeout /= 2;
 894                 wpa_s->sched_scan_interval *= 2;
 895         }
 896
 897         return 0;
 898 }
 899
 900
 901 /**
 902  * wpa_supplicant_cancel_scan - Cancel a scheduled scan request
 903  * @wpa_s: Pointer to wpa_supplicant data
 904  *
 905  * This function is used to cancel a scan request scheduled with
 906  * wpa_supplicant_req_scan().
 907  */
 908 void wpa_supplicant_cancel_scan(struct wpa_supplicant *wpa_s)
 909 {
 910         wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling scan request");
 911         eloop_cancel_timeout(wpa_supplicant_scan, wpa_s, NULL);
 912 }
 913
 914
 915 /**
 916  * wpa_supplicant_cancel_sched_scan - Stop running scheduled scans
 917  * @wpa_s: Pointer to wpa_supplicant data
 918  *
 919  * This function is used to stop a periodic scheduled scan.
 920  */
 921 void wpa_supplicant_cancel_sched_scan(struct wpa_supplicant *wpa_s)
 922 {
 923         if (!wpa_s->sched_scanning)
 924                 return;
 925
 926         wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling sched scan");
 927         eloop_cancel_timeout(wpa_supplicant_sched_scan_timeout, wpa_s, NULL);
 928         wpa_supplicant_stop_sched_scan(wpa_s);
 929 }
 930
 931
 932 void wpa_supplicant_notify_scanning(struct wpa_supplicant *wpa_s,
 933                                     int scanning)
 934 {
 935         if (wpa_s->scanning != scanning) {
 936                 wpa_s->scanning = scanning;
 937                 wpas_notify_scanning(wpa_s);
 938         }
 939 }
 940
 941
 942 static int wpa_scan_get_max_rate(const struct wpa_scan_res *res)
 943 {
 944         int rate = 0;
 945         const u8 *ie;
 946         int i;
 947
 948         ie = wpa_scan_get_ie(res, WLAN_EID_SUPP_RATES);
 949         for (i = 0; ie && i < ie[1]; i++) {
 950                 if ((ie[i + 2] & 0x7f) > rate)
 951                         rate = ie[i + 2] & 0x7f;
 952         }
 953
 954         ie = wpa_scan_get_ie(res, WLAN_EID_EXT_SUPP_RATES);
 955         for (i = 0; ie && i < ie[1]; i++) {
 956                 if ((ie[i + 2] & 0x7f) > rate)
 957                         rate = ie[i + 2] & 0x7f;
 958         }
 959
 960         return rate;
 961 }
 962
 963
 964 const u8 * wpa_scan_get_ie(const struct wpa_scan_res *res, u8 ie)
 965 {
 966         const u8 *end, *pos;
 967
 968         pos = (const u8 *) (res + 1);
 969         end = pos + res->ie_len;
 970
 971         while (pos + 1 < end) {
 972                 if (pos + 2 + pos[1] > end)
 973                         break;
 974                 if (pos[0] == ie)
 975                         return pos;
 976                 pos += 2 + pos[1];
 977         }
 978
 979         return NULL;
 980 }
 981
 982
 983 const u8 * wpa_scan_get_vendor_ie(const struct wpa_scan_res *res,
 984                                   u32 vendor_type)
 985 {
 986         const u8 *end, *pos;
 987
 988         pos = (const u8 *) (res + 1);
 989         end = pos + res->ie_len;
 990
 991         while (pos + 1 < end) {
 992                 if (pos + 2 + pos[1] > end)
 993                         break;
 994                 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
 995                     vendor_type == WPA_GET_BE32(&pos[2]))
 996                         return pos;
 997                 pos += 2 + pos[1];
 998         }
 999
1000         return NULL;
1001 }
1002
1003
1004 struct wpabuf * wpa_scan_get_vendor_ie_multi(const struct wpa_scan_res *res,
1005                                              u32 vendor_type)
1006 {
1007         struct wpabuf *buf;
1008         const u8 *end, *pos;
1009
1010         buf = wpabuf_alloc(res->ie_len);
1011         if (buf == NULL)
1012                 return NULL;
1013
1014         pos = (const u8 *) (res + 1);
1015         end = pos + res->ie_len;
1016
1017         while (pos + 1 < end) {
1018                 if (pos + 2 + pos[1] > end)
1019                         break;
1020                 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1021                     vendor_type == WPA_GET_BE32(&pos[2]))
1022                         wpabuf_put_data(buf, pos + 2 + 4, pos[1] - 4);
1023                 pos += 2 + pos[1];
1024         }
1025
1026         if (wpabuf_len(buf) == 0) {
1027                 wpabuf_free(buf);
1028                 buf = NULL;
1029         }
1030
1031         return buf;
1032 }
1033
1034
1035 struct wpabuf * wpa_scan_get_vendor_ie_multi_beacon(
1036         const struct wpa_scan_res *res, u32 vendor_type)
1037 {
1038         struct wpabuf *buf;
1039         const u8 *end, *pos;
1040
1041         if (res->beacon_ie_len == 0)
1042                 return NULL;
1043         buf = wpabuf_alloc(res->beacon_ie_len);
1044         if (buf == NULL)
1045                 return NULL;
1046
1047         pos = (const u8 *) (res + 1);
1048         pos += res->ie_len;
1049         end = pos + res->beacon_ie_len;
1050
1051         while (pos + 1 < end) {
1052                 if (pos + 2 + pos[1] > end)
1053                         break;
1054                 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1055                     vendor_type == WPA_GET_BE32(&pos[2]))
1056                         wpabuf_put_data(buf, pos + 2 + 4, pos[1] - 4);
1057                 pos += 2 + pos[1];
1058         }
1059
1060         if (wpabuf_len(buf) == 0) {
1061                 wpabuf_free(buf);
1062                 buf = NULL;
1063         }
1064
1065         return buf;
1066 }
1067
1068
1069 /*
1070  * Channels with a great SNR can operate at full rate. What is a great SNR?
1071  * This doc https://supportforums.cisco.com/docs/DOC-12954 says, "the general
1072  * rule of thumb is that any SNR above 20 is good." This one
1073  * http://www.cisco.com/en/US/tech/tk722/tk809/technologies_q_and_a_item09186a00805e9a96.shtml#qa23
1074  * recommends 25 as a minimum SNR for 54 Mbps data rate. 30 is chosen here as a
1075  * conservative value.
1076  */
1077 #define GREAT_SNR 30
1078
1079 /* Compare function for sorting scan results. Return >0 if @b is considered
1080  * better. */
1081 static int wpa_scan_result_compar(const void *a, const void *b)
1082 {
1083 #define IS_5GHZ(n) (n > 4000)
1084 #define MIN(a,b) a < b ? a : b
1085         struct wpa_scan_res **_wa = (void *) a;
1086         struct wpa_scan_res **_wb = (void *) b;
1087         struct wpa_scan_res *wa = *_wa;
1088         struct wpa_scan_res *wb = *_wb;
1089         int wpa_a, wpa_b, maxrate_a, maxrate_b;
1090         int snr_a, snr_b;
1091
1092         /* WPA/WPA2 support preferred */
1093         wpa_a = wpa_scan_get_vendor_ie(wa, WPA_IE_VENDOR_TYPE) != NULL ||
1094                 wpa_scan_get_ie(wa, WLAN_EID_RSN) != NULL;
1095         wpa_b = wpa_scan_get_vendor_ie(wb, WPA_IE_VENDOR_TYPE) != NULL ||
1096                 wpa_scan_get_ie(wb, WLAN_EID_RSN) != NULL;
1097
1098         if (wpa_b && !wpa_a)
1099                 return 1;
1100         if (!wpa_b && wpa_a)
1101                 return -1;
1102
1103         /* privacy support preferred */
1104         if ((wa->caps & IEEE80211_CAP_PRIVACY) == 0 &&
1105             (wb->caps & IEEE80211_CAP_PRIVACY))
1106                 return 1;
1107         if ((wa->caps & IEEE80211_CAP_PRIVACY) &&
1108             (wb->caps & IEEE80211_CAP_PRIVACY) == 0)
1109                 return -1;
1110
1111         if ((wa->flags & wb->flags & WPA_SCAN_LEVEL_DBM) &&
1112             !((wa->flags | wb->flags) & WPA_SCAN_NOISE_INVALID)) {
1113                 snr_a = MIN(wa->level - wa->noise, GREAT_SNR);
1114                 snr_b = MIN(wb->level - wb->noise, GREAT_SNR);
1115         } else {
1116                 /* Not suitable information to calculate SNR, so use level */
1117                 snr_a = wa->level;
1118                 snr_b = wb->level;
1119         }
1120
1121         /* best/max rate preferred if SNR close enough */
1122         if ((snr_a && snr_b && abs(snr_b - snr_a) < 5) ||
1123             (wa->qual && wb->qual && abs(wb->qual - wa->qual) < 10)) {
1124                 maxrate_a = wpa_scan_get_max_rate(wa);
1125                 maxrate_b = wpa_scan_get_max_rate(wb);
1126                 if (maxrate_a != maxrate_b)
1127                         return maxrate_b - maxrate_a;
1128                 if (IS_5GHZ(wa->freq) ^ IS_5GHZ(wb->freq))
1129                         return IS_5GHZ(wa->freq) ? -1 : 1;
1130         }
1131
1132         /* use freq for channel preference */
1133
1134         /* all things being equal, use SNR; if SNRs are
1135          * identical, use quality values since some drivers may only report
1136          * that value and leave the signal level zero */
1137         if (snr_b == snr_a)
1138                 return wb->qual - wa->qual;
1139         return snr_b - snr_a;
1140 #undef MIN
1141 #undef IS_5GHZ
1142 }
1143
1144
1145 #ifdef CONFIG_WPS
1146 /* Compare function for sorting scan results when searching a WPS AP for
1147  * provisioning. Return >0 if @b is considered better. */
1148 static int wpa_scan_result_wps_compar(const void *a, const void *b)
1149 {
1150         struct wpa_scan_res **_wa = (void *) a;
1151         struct wpa_scan_res **_wb = (void *) b;
1152         struct wpa_scan_res *wa = *_wa;
1153         struct wpa_scan_res *wb = *_wb;
1154         int uses_wps_a, uses_wps_b;
1155         struct wpabuf *wps_a, *wps_b;
1156         int res;
1157
1158         /* Optimization - check WPS IE existence before allocated memory and
1159          * doing full reassembly. */
1160         uses_wps_a = wpa_scan_get_vendor_ie(wa, WPS_IE_VENDOR_TYPE) != NULL;
1161         uses_wps_b = wpa_scan_get_vendor_ie(wb, WPS_IE_VENDOR_TYPE) != NULL;
1162         if (uses_wps_a && !uses_wps_b)
1163                 return -1;
1164         if (!uses_wps_a && uses_wps_b)
1165                 return 1;
1166
1167         if (uses_wps_a && uses_wps_b) {
1168                 wps_a = wpa_scan_get_vendor_ie_multi(wa, WPS_IE_VENDOR_TYPE);
1169                 wps_b = wpa_scan_get_vendor_ie_multi(wb, WPS_IE_VENDOR_TYPE);
1170                 res = wps_ap_priority_compar(wps_a, wps_b);
1171                 wpabuf_free(wps_a);
1172                 wpabuf_free(wps_b);
1173                 if (res)
1174                         return res;
1175         }
1176
1177         /*
1178          * Do not use current AP security policy as a sorting criteria during
1179          * WPS provisioning step since the AP may get reconfigured at the
1180          * completion of provisioning.
1181          */
1182
1183         /* all things being equal, use signal level; if signal levels are
1184          * identical, use quality values since some drivers may only report
1185          * that value and leave the signal level zero */
1186         if (wb->level == wa->level)
1187                 return wb->qual - wa->qual;
1188         return wb->level - wa->level;
1189 }
1190 #endif /* CONFIG_WPS */
1191
1192
1193 static void dump_scan_res(struct wpa_scan_results *scan_res)
1194 {
1195 #ifndef CONFIG_NO_STDOUT_DEBUG
1196         size_t i;
1197
1198         if (scan_res->res == NULL || scan_res->num == 0)
1199                 return;
1200
1201         wpa_printf(MSG_EXCESSIVE, "Sorted scan results");
1202
1203         for (i = 0; i < scan_res->num; i++) {
1204                 struct wpa_scan_res *r = scan_res->res[i];
1205                 if ((r->flags & (WPA_SCAN_LEVEL_DBM | WPA_SCAN_NOISE_INVALID))
1206                     == WPA_SCAN_LEVEL_DBM) {
1207                         int snr = r->level - r->noise;
1208                         wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d "
1209                                    "noise=%d level=%d snr=%d%s flags=0x%x",
1210                                    MAC2STR(r->bssid), r->freq, r->qual,
1211                                    r->noise, r->level, snr,
1212                                    snr >= GREAT_SNR ? "*" : "", r->flags);
1213                 } else {
1214                         wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d "
1215                                    "noise=%d level=%d flags=0x%x",
1216                                    MAC2STR(r->bssid), r->freq, r->qual,
1217                                    r->noise, r->level, r->flags);
1218                 }
1219         }
1220 #endif /* CONFIG_NO_STDOUT_DEBUG */
1221 }
1222
1223
1224 /**
1225  * wpa_supplicant_get_scan_results - Get scan results
1226  * @wpa_s: Pointer to wpa_supplicant data
1227  * @info: Information about what was scanned or %NULL if not available
1228  * @new_scan: Whether a new scan was performed
1229  * Returns: Scan results, %NULL on failure
1230  *
1231  * This function request the current scan results from the driver and updates
1232  * the local BSS list wpa_s->bss. The caller is responsible for freeing the
1233  * results with wpa_scan_results_free().
1234  */
1235 struct wpa_scan_results *
1236 wpa_supplicant_get_scan_results(struct wpa_supplicant *wpa_s,
1237                                 struct scan_info *info, int new_scan)
1238 {
1239         struct wpa_scan_results *scan_res;
1240         size_t i;
1241         int (*compar)(const void *, const void *) = wpa_scan_result_compar;
1242
1243         scan_res = wpa_drv_get_scan_results2(wpa_s);
1244         if (scan_res == NULL) {
1245                 wpa_dbg(wpa_s, MSG_DEBUG, "Failed to get scan results");
1246                 return NULL;
1247         }
1248
1249 #ifdef CONFIG_WPS
1250         if (wpas_wps_in_progress(wpa_s)) {
1251                 wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Order scan results with WPS "
1252                         "provisioning rules");
1253                 compar = wpa_scan_result_wps_compar;
1254         }
1255 #endif /* CONFIG_WPS */
1256
1257         qsort(scan_res->res, scan_res->num, sizeof(struct wpa_scan_res *),
1258               compar);
1259         dump_scan_res(scan_res);
1260
1261         wpa_bss_update_start(wpa_s);
1262         for (i = 0; i < scan_res->num; i++)
1263                 wpa_bss_update_scan_res(wpa_s, scan_res->res[i]);
1264         wpa_bss_update_end(wpa_s, info, new_scan);
1265
1266         return scan_res;
1267 }
1268
1269
1270 int wpa_supplicant_update_scan_results(struct wpa_supplicant *wpa_s)
1271 {
1272         struct wpa_scan_results *scan_res;
1273         scan_res = wpa_supplicant_get_scan_results(wpa_s, NULL, 0);
1274         if (scan_res == NULL)
1275                 return -1;
1276         wpa_scan_results_free(scan_res);
1277
1278         return 0;
1279 }