wpa_supplicant/scan.c

   1 /*
   2  * WPA Supplicant - Scanning
   3  * Copyright (c) 2003-2014, 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 "common/wpa_ctrl.h"
  15 #include "config.h"
  16 #include "wpa_supplicant_i.h"
  17 #include "driver_i.h"
  18 #include "wps_supplicant.h"
  19 #include "p2p_supplicant.h"
  20 #include "p2p/p2p.h"
  21 #include "hs20_supplicant.h"
  22 #include "notify.h"
  23 #include "bss.h"
  24 #include "scan.h"
  25
  26
  27 static void wpa_supplicant_gen_assoc_event(struct wpa_supplicant *wpa_s)
  28 {
  29         struct wpa_ssid *ssid;
  30         union wpa_event_data data;
  31
  32         ssid = wpa_supplicant_get_ssid(wpa_s);
  33         if (ssid == NULL)
  34                 return;
  35
  36         if (wpa_s->current_ssid == NULL) {
  37                 wpa_s->current_ssid = ssid;
  38                 if (wpa_s->current_ssid != NULL)
  39                         wpas_notify_network_changed(wpa_s);
  40         }
  41         wpa_supplicant_initiate_eapol(wpa_s);
  42         wpa_dbg(wpa_s, MSG_DEBUG, "Already associated with a configured "
  43                 "network - generating associated event");
  44         os_memset(&data, 0, sizeof(data));
  45         wpa_supplicant_event(wpa_s, EVENT_ASSOC, &data);
  46 }
  47
  48
  49 #ifdef CONFIG_WPS
  50 static int wpas_wps_in_use(struct wpa_supplicant *wpa_s,
  51                            enum wps_request_type *req_type)
  52 {
  53         struct wpa_ssid *ssid;
  54         int wps = 0;
  55
  56         for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
  57                 if (!(ssid->key_mgmt & WPA_KEY_MGMT_WPS))
  58                         continue;
  59
  60                 wps = 1;
  61                 *req_type = wpas_wps_get_req_type(ssid);
  62                 if (!ssid->eap.phase1)
  63                         continue;
  64
  65                 if (os_strstr(ssid->eap.phase1, "pbc=1"))
  66                         return 2;
  67         }
  68
  69 #ifdef CONFIG_P2P
  70         if (!wpa_s->global->p2p_disabled && wpa_s->global->p2p &&
  71             !wpa_s->conf->p2p_disabled) {
  72                 wpa_s->wps->dev.p2p = 1;
  73                 if (!wps) {
  74                         wps = 1;
  75                         *req_type = WPS_REQ_ENROLLEE_INFO;
  76                 }
  77         }
  78 #endif /* CONFIG_P2P */
  79
  80         return wps;
  81 }
  82 #endif /* CONFIG_WPS */
  83
  84
  85 /**
  86  * wpa_supplicant_enabled_networks - Check whether there are enabled networks
  87  * @wpa_s: Pointer to wpa_supplicant data
  88  * Returns: 0 if no networks are enabled, >0 if networks are enabled
  89  *
  90  * This function is used to figure out whether any networks (or Interworking
  91  * with enabled credentials and auto_interworking) are present in the current
  92  * configuration.
  93  */
  94 int wpa_supplicant_enabled_networks(struct wpa_supplicant *wpa_s)
  95 {
  96         struct wpa_ssid *ssid = wpa_s->conf->ssid;
  97         int count = 0, disabled = 0;
  98         while (ssid) {
  99                 if (!wpas_network_disabled(wpa_s, ssid))
 100                         count++;
 101                 else
 102                         disabled++;
 103                 ssid = ssid->next;
 104         }
 105         if (wpa_s->conf->cred && wpa_s->conf->interworking &&
 106             wpa_s->conf->auto_interworking)
 107                 count++;
 108         if (count == 0 && disabled > 0) {
 109                 wpa_dbg(wpa_s, MSG_DEBUG, "No enabled networks (%d disabled "
 110                         "networks)", disabled);
 111         }
 112         return count;
 113 }
 114
 115
 116 static void wpa_supplicant_assoc_try(struct wpa_supplicant *wpa_s,
 117                                      struct wpa_ssid *ssid)
 118 {
 119         while (ssid) {
 120                 if (!wpas_network_disabled(wpa_s, ssid))
 121                         break;
 122                 ssid = ssid->next;
 123         }
 124
 125         /* ap_scan=2 mode - try to associate with each SSID. */
 126         if (ssid == NULL) {
 127                 wpa_dbg(wpa_s, MSG_DEBUG, "wpa_supplicant_assoc_try: Reached "
 128                         "end of scan list - go back to beginning");
 129                 wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
 130                 wpa_supplicant_req_scan(wpa_s, 0, 0);
 131                 return;
 132         }
 133         if (ssid->next) {
 134                 /* Continue from the next SSID on the next attempt. */
 135                 wpa_s->prev_scan_ssid = ssid;
 136         } else {
 137                 /* Start from the beginning of the SSID list. */
 138                 wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
 139         }
 140         wpa_supplicant_associate(wpa_s, NULL, ssid);
 141 }
 142
 143
 144 static void wpas_trigger_scan_cb(struct wpa_radio_work *work, int deinit)
 145 {
 146         struct wpa_supplicant *wpa_s = work->wpa_s;
 147         struct wpa_driver_scan_params *params = work->ctx;
 148         int ret;
 149
 150         if (deinit) {
 151                 wpa_scan_free_params(params);
 152                 return;
 153         }
 154
 155         wpa_supplicant_notify_scanning(wpa_s, 1);
 156
 157         if (wpa_s->clear_driver_scan_cache)
 158                 params->only_new_results = 1;
 159         ret = wpa_drv_scan(wpa_s, params);
 160         wpa_scan_free_params(params);
 161         work->ctx = NULL;
 162         if (ret) {
 163                 wpa_supplicant_notify_scanning(wpa_s, 0);
 164                 wpas_notify_scan_done(wpa_s, 0);
 165                 radio_work_done(work);
 166                 return;
 167         }
 168
 169         os_get_reltime(&wpa_s->scan_trigger_time);
 170         wpa_s->scan_runs++;
 171         wpa_s->normal_scans++;
 172         wpa_s->own_scan_requested = 1;
 173         wpa_s->clear_driver_scan_cache = 0;
 174         wpa_s->scan_work = work;
 175 }
 176
 177
 178 /**
 179  * wpa_supplicant_trigger_scan - Request driver to start a scan
 180  * @wpa_s: Pointer to wpa_supplicant data
 181  * @params: Scan parameters
 182  * Returns: 0 on success, -1 on failure
 183  */
 184 int wpa_supplicant_trigger_scan(struct wpa_supplicant *wpa_s,
 185                                 struct wpa_driver_scan_params *params)
 186 {
 187         struct wpa_driver_scan_params *ctx;
 188
 189         if (wpa_s->scan_work) {
 190                 wpa_dbg(wpa_s, MSG_INFO, "Reject scan trigger since one is already pending");
 191                 return -1;
 192         }
 193
 194         ctx = wpa_scan_clone_params(params);
 195         if (ctx == NULL)
 196                 return -1;
 197
 198         if (radio_add_work(wpa_s, 0, "scan", 0, wpas_trigger_scan_cb, ctx) < 0)
 199         {
 200                 wpa_scan_free_params(ctx);
 201                 return -1;
 202         }
 203
 204         return 0;
 205 }
 206
 207
 208 static void
 209 wpa_supplicant_delayed_sched_scan_timeout(void *eloop_ctx, void *timeout_ctx)
 210 {
 211         struct wpa_supplicant *wpa_s = eloop_ctx;
 212
 213         wpa_dbg(wpa_s, MSG_DEBUG, "Starting delayed sched scan");
 214
 215         if (wpa_supplicant_req_sched_scan(wpa_s))
 216                 wpa_supplicant_req_scan(wpa_s, 0, 0);
 217 }
 218
 219
 220 static void
 221 wpa_supplicant_sched_scan_timeout(void *eloop_ctx, void *timeout_ctx)
 222 {
 223         struct wpa_supplicant *wpa_s = eloop_ctx;
 224
 225         wpa_dbg(wpa_s, MSG_DEBUG, "Sched scan timeout - stopping it");
 226
 227         wpa_s->sched_scan_timed_out = 1;
 228         wpa_supplicant_cancel_sched_scan(wpa_s);
 229 }
 230
 231
 232 int wpa_supplicant_start_sched_scan(struct wpa_supplicant *wpa_s,
 233                                     struct wpa_driver_scan_params *params,
 234                                     int interval)
 235 {
 236         int ret;
 237
 238         wpa_supplicant_notify_scanning(wpa_s, 1);
 239         ret = wpa_drv_sched_scan(wpa_s, params, interval * 1000);
 240         if (ret)
 241                 wpa_supplicant_notify_scanning(wpa_s, 0);
 242         else
 243                 wpa_s->sched_scanning = 1;
 244
 245         return ret;
 246 }
 247
 248
 249 int wpa_supplicant_stop_sched_scan(struct wpa_supplicant *wpa_s)
 250 {
 251         int ret;
 252
 253         ret = wpa_drv_stop_sched_scan(wpa_s);
 254         if (ret) {
 255                 wpa_dbg(wpa_s, MSG_DEBUG, "stopping sched_scan failed!");
 256                 /* TODO: what to do if stopping fails? */
 257                 return -1;
 258         }
 259
 260         return ret;
 261 }
 262
 263
 264 static struct wpa_driver_scan_filter *
 265 wpa_supplicant_build_filter_ssids(struct wpa_config *conf, size_t *num_ssids)
 266 {
 267         struct wpa_driver_scan_filter *ssids;
 268         struct wpa_ssid *ssid;
 269         size_t count;
 270
 271         *num_ssids = 0;
 272         if (!conf->filter_ssids)
 273                 return NULL;
 274
 275         for (count = 0, ssid = conf->ssid; ssid; ssid = ssid->next) {
 276                 if (ssid->ssid && ssid->ssid_len)
 277                         count++;
 278         }
 279         if (count == 0)
 280                 return NULL;
 281         ssids = os_zalloc(count * sizeof(struct wpa_driver_scan_filter));
 282         if (ssids == NULL)
 283                 return NULL;
 284
 285         for (ssid = conf->ssid; ssid; ssid = ssid->next) {
 286                 if (!ssid->ssid || !ssid->ssid_len)
 287                         continue;
 288                 os_memcpy(ssids[*num_ssids].ssid, ssid->ssid, ssid->ssid_len);
 289                 ssids[*num_ssids].ssid_len = ssid->ssid_len;
 290                 (*num_ssids)++;
 291         }
 292
 293         return ssids;
 294 }
 295
 296
 297 static void wpa_supplicant_optimize_freqs(
 298         struct wpa_supplicant *wpa_s, struct wpa_driver_scan_params *params)
 299 {
 300 #ifdef CONFIG_P2P
 301         if (params->freqs == NULL && wpa_s->p2p_in_provisioning &&
 302             wpa_s->go_params) {
 303                 /* Optimize provisioning state scan based on GO information */
 304                 if (wpa_s->p2p_in_provisioning < 5 &&
 305                     wpa_s->go_params->freq > 0) {
 306                         wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only GO "
 307                                 "preferred frequency %d MHz",
 308                                 wpa_s->go_params->freq);
 309                         params->freqs = os_zalloc(2 * sizeof(int));
 310                         if (params->freqs)
 311                                 params->freqs[0] = wpa_s->go_params->freq;
 312                 } else if (wpa_s->p2p_in_provisioning < 8 &&
 313                            wpa_s->go_params->freq_list[0]) {
 314                         wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only common "
 315                                 "channels");
 316                         int_array_concat(&params->freqs,
 317                                          wpa_s->go_params->freq_list);
 318                         if (params->freqs)
 319                                 int_array_sort_unique(params->freqs);
 320                 }
 321                 wpa_s->p2p_in_provisioning++;
 322         }
 323 #endif /* CONFIG_P2P */
 324
 325 #ifdef CONFIG_WPS
 326         if (params->freqs == NULL && wpa_s->after_wps && wpa_s->wps_freq) {
 327                 /*
 328                  * Optimize post-provisioning scan based on channel used
 329                  * during provisioning.
 330                  */
 331                 wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Scan only frequency %u MHz "
 332                         "that was used during provisioning", wpa_s->wps_freq);
 333                 params->freqs = os_zalloc(2 * sizeof(int));
 334                 if (params->freqs)
 335                         params->freqs[0] = wpa_s->wps_freq;
 336                 wpa_s->after_wps--;
 337         } else if (wpa_s->after_wps)
 338                 wpa_s->after_wps--;
 339
 340         if (params->freqs == NULL && wpa_s->known_wps_freq && wpa_s->wps_freq)
 341         {
 342                 /* Optimize provisioning scan based on already known channel */
 343                 wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Scan only frequency %u MHz",
 344                         wpa_s->wps_freq);
 345                 params->freqs = os_zalloc(2 * sizeof(int));
 346                 if (params->freqs)
 347                         params->freqs[0] = wpa_s->wps_freq;
 348                 wpa_s->known_wps_freq = 0; /* only do this once */
 349         }
 350 #endif /* CONFIG_WPS */
 351 }
 352
 353
 354 #ifdef CONFIG_INTERWORKING
 355 static void wpas_add_interworking_elements(struct wpa_supplicant *wpa_s,
 356                                            struct wpabuf *buf)
 357 {
 358         if (wpa_s->conf->interworking == 0)
 359                 return;
 360
 361         wpabuf_put_u8(buf, WLAN_EID_EXT_CAPAB);
 362         wpabuf_put_u8(buf, 4);
 363         wpabuf_put_u8(buf, 0x00);
 364         wpabuf_put_u8(buf, 0x00);
 365         wpabuf_put_u8(buf, 0x00);
 366         wpabuf_put_u8(buf, 0x80); /* Bit 31 - Interworking */
 367
 368         wpabuf_put_u8(buf, WLAN_EID_INTERWORKING);
 369         wpabuf_put_u8(buf, is_zero_ether_addr(wpa_s->conf->hessid) ? 1 :
 370                       1 + ETH_ALEN);
 371         wpabuf_put_u8(buf, wpa_s->conf->access_network_type);
 372         /* No Venue Info */
 373         if (!is_zero_ether_addr(wpa_s->conf->hessid))
 374                 wpabuf_put_data(buf, wpa_s->conf->hessid, ETH_ALEN);
 375 }
 376 #endif /* CONFIG_INTERWORKING */
 377
 378
 379 static struct wpabuf * wpa_supplicant_extra_ies(struct wpa_supplicant *wpa_s)
 380 {
 381         struct wpabuf *extra_ie = NULL;
 382 #ifdef CONFIG_WPS
 383         int wps = 0;
 384         enum wps_request_type req_type = WPS_REQ_ENROLLEE_INFO;
 385 #endif /* CONFIG_WPS */
 386
 387 #ifdef CONFIG_INTERWORKING
 388         if (wpa_s->conf->interworking &&
 389             wpabuf_resize(&extra_ie, 100) == 0)
 390                 wpas_add_interworking_elements(wpa_s, extra_ie);
 391 #endif /* CONFIG_INTERWORKING */
 392
 393 #ifdef CONFIG_WPS
 394         wps = wpas_wps_in_use(wpa_s, &req_type);
 395
 396         if (wps) {
 397                 struct wpabuf *wps_ie;
 398                 wps_ie = wps_build_probe_req_ie(wps == 2 ? DEV_PW_PUSHBUTTON :
 399                                                 DEV_PW_DEFAULT,
 400                                                 &wpa_s->wps->dev,
 401                                                 wpa_s->wps->uuid, req_type,
 402                                                 0, NULL);
 403                 if (wps_ie) {
 404                         if (wpabuf_resize(&extra_ie, wpabuf_len(wps_ie)) == 0)
 405                                 wpabuf_put_buf(extra_ie, wps_ie);
 406                         wpabuf_free(wps_ie);
 407                 }
 408         }
 409
 410 #ifdef CONFIG_P2P
 411         if (wps) {
 412                 size_t ielen = p2p_scan_ie_buf_len(wpa_s->global->p2p);
 413                 if (wpabuf_resize(&extra_ie, ielen) == 0)
 414                         wpas_p2p_scan_ie(wpa_s, extra_ie);
 415         }
 416 #endif /* CONFIG_P2P */
 417
 418 #endif /* CONFIG_WPS */
 419
 420 #ifdef CONFIG_HS20
 421         if (wpa_s->conf->hs20 && wpabuf_resize(&extra_ie, 7) == 0)
 422                 wpas_hs20_add_indication(extra_ie);
 423 #endif /* CONFIG_HS20 */
 424
 425         return extra_ie;
 426 }
 427
 428
 429 #ifdef CONFIG_P2P
 430
 431 /*
 432  * Check whether there are any enabled networks or credentials that could be
 433  * used for a non-P2P connection.
 434  */
 435 static int non_p2p_network_enabled(struct wpa_supplicant *wpa_s)
 436 {
 437         struct wpa_ssid *ssid;
 438
 439         for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
 440                 if (wpas_network_disabled(wpa_s, ssid))
 441                         continue;
 442                 if (!ssid->p2p_group)
 443                         return 1;
 444         }
 445
 446         if (wpa_s->conf->cred && wpa_s->conf->interworking &&
 447             wpa_s->conf->auto_interworking)
 448                 return 1;
 449
 450         return 0;
 451 }
 452
 453 #endif /* CONFIG_P2P */
 454
 455
 456 static struct hostapd_hw_modes * get_mode(struct hostapd_hw_modes *modes,
 457                                           u16 num_modes,
 458                                           enum hostapd_hw_mode mode)
 459 {
 460         u16 i;
 461
 462         for (i = 0; i < num_modes; i++) {
 463                 if (modes[i].mode == mode)
 464                         return &modes[i];
 465         }
 466
 467         return NULL;
 468 }
 469
 470
 471 static void wpa_setband_scan_freqs_list(struct wpa_supplicant *wpa_s,
 472                                         enum hostapd_hw_mode band,
 473                                         struct wpa_driver_scan_params *params)
 474 {
 475         /* Include only supported channels for the specified band */
 476         struct hostapd_hw_modes *mode;
 477         int count, i;
 478
 479         mode = get_mode(wpa_s->hw.modes, wpa_s->hw.num_modes, band);
 480         if (mode == NULL) {
 481                 /* No channels supported in this band - use empty list */
 482                 params->freqs = os_zalloc(sizeof(int));
 483                 return;
 484         }
 485
 486         params->freqs = os_zalloc((mode->num_channels + 1) * sizeof(int));
 487         if (params->freqs == NULL)
 488                 return;
 489         for (count = 0, i = 0; i < mode->num_channels; i++) {
 490                 if (mode->channels[i].flag & HOSTAPD_CHAN_DISABLED)
 491                         continue;
 492                 params->freqs[count++] = mode->channels[i].freq;
 493         }
 494 }
 495
 496
 497 static void wpa_setband_scan_freqs(struct wpa_supplicant *wpa_s,
 498                                    struct wpa_driver_scan_params *params)
 499 {
 500         if (wpa_s->hw.modes == NULL)
 501                 return; /* unknown what channels the driver supports */
 502         if (params->freqs)
 503                 return; /* already using a limited channel set */
 504         if (wpa_s->setband == WPA_SETBAND_5G)
 505                 wpa_setband_scan_freqs_list(wpa_s, HOSTAPD_MODE_IEEE80211A,
 506                                             params);
 507         else if (wpa_s->setband == WPA_SETBAND_2G)
 508                 wpa_setband_scan_freqs_list(wpa_s, HOSTAPD_MODE_IEEE80211G,
 509                                             params);
 510 }
 511
 512
 513 static void wpa_supplicant_scan(void *eloop_ctx, void *timeout_ctx)
 514 {
 515         struct wpa_supplicant *wpa_s = eloop_ctx;
 516         struct wpa_ssid *ssid;
 517         int ret;
 518         struct wpabuf *extra_ie = NULL;
 519         struct wpa_driver_scan_params params;
 520         struct wpa_driver_scan_params *scan_params;
 521         size_t max_ssids;
 522         enum wpa_states prev_state;
 523
 524         if (wpa_s->wpa_state == WPA_INTERFACE_DISABLED) {
 525                 wpa_dbg(wpa_s, MSG_DEBUG, "Skip scan - interface disabled");
 526                 return;
 527         }
 528
 529         if (wpa_s->disconnected && wpa_s->scan_req == NORMAL_SCAN_REQ) {
 530                 wpa_dbg(wpa_s, MSG_DEBUG, "Disconnected - do not scan");
 531                 wpa_supplicant_set_state(wpa_s, WPA_DISCONNECTED);
 532                 return;
 533         }
 534
 535         if (wpa_s->scanning) {
 536                 /*
 537                  * If we are already in scanning state, we shall reschedule the
 538                  * the incoming scan request.
 539                  */
 540                 wpa_dbg(wpa_s, MSG_DEBUG, "Already scanning - Reschedule the incoming scan req");
 541                 wpa_supplicant_req_scan(wpa_s, 1, 0);
 542                 return;
 543         }
 544
 545         if (!wpa_supplicant_enabled_networks(wpa_s) &&
 546             wpa_s->scan_req == NORMAL_SCAN_REQ) {
 547                 wpa_dbg(wpa_s, MSG_DEBUG, "No enabled networks - do not scan");
 548                 wpa_supplicant_set_state(wpa_s, WPA_INACTIVE);
 549                 return;
 550         }
 551
 552         if (wpa_s->conf->ap_scan != 0 &&
 553             (wpa_s->drv_flags & WPA_DRIVER_FLAGS_WIRED)) {
 554                 wpa_dbg(wpa_s, MSG_DEBUG, "Using wired authentication - "
 555                         "overriding ap_scan configuration");
 556                 wpa_s->conf->ap_scan = 0;
 557                 wpas_notify_ap_scan_changed(wpa_s);
 558         }
 559
 560         if (wpa_s->conf->ap_scan == 0) {
 561                 wpa_supplicant_gen_assoc_event(wpa_s);
 562                 return;
 563         }
 564
 565 #ifdef CONFIG_P2P
 566         if (wpas_p2p_in_progress(wpa_s)) {
 567                 wpa_dbg(wpa_s, MSG_DEBUG, "Delay station mode scan while P2P operation is in progress");
 568                 wpa_supplicant_req_scan(wpa_s, 5, 0);
 569                 return;
 570         }
 571 #endif /* CONFIG_P2P */
 572
 573         if (wpa_s->conf->ap_scan == 2)
 574                 max_ssids = 1;
 575         else {
 576                 max_ssids = wpa_s->max_scan_ssids;
 577                 if (max_ssids > WPAS_MAX_SCAN_SSIDS)
 578                         max_ssids = WPAS_MAX_SCAN_SSIDS;
 579         }
 580
 581         wpa_s->last_scan_req = wpa_s->scan_req;
 582         wpa_s->scan_req = NORMAL_SCAN_REQ;
 583
 584         os_memset(&params, 0, sizeof(params));
 585
 586         prev_state = wpa_s->wpa_state;
 587         if (wpa_s->wpa_state == WPA_DISCONNECTED ||
 588             wpa_s->wpa_state == WPA_INACTIVE)
 589                 wpa_supplicant_set_state(wpa_s, WPA_SCANNING);
 590
 591         /*
 592          * If autoscan has set its own scanning parameters
 593          */
 594         if (wpa_s->autoscan_params != NULL) {
 595                 scan_params = wpa_s->autoscan_params;
 596                 goto scan;
 597         }
 598
 599         if (wpa_s->last_scan_req != MANUAL_SCAN_REQ &&
 600             wpa_s->connect_without_scan) {
 601                 for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
 602                         if (ssid == wpa_s->connect_without_scan)
 603                                 break;
 604                 }
 605                 wpa_s->connect_without_scan = NULL;
 606                 if (ssid) {
 607                         wpa_printf(MSG_DEBUG, "Start a pre-selected network "
 608                                    "without scan step");
 609                         wpa_supplicant_associate(wpa_s, NULL, ssid);
 610                         return;
 611                 }
 612         }
 613
 614 #ifdef CONFIG_P2P
 615         if ((wpa_s->p2p_in_provisioning || wpa_s->show_group_started) &&
 616             wpa_s->go_params) {
 617                 wpa_printf(MSG_DEBUG, "P2P: Use specific SSID for scan during P2P group formation (p2p_in_provisioning=%d show_group_started=%d)",
 618                            wpa_s->p2p_in_provisioning,
 619                            wpa_s->show_group_started);
 620                 params.ssids[0].ssid = wpa_s->go_params->ssid;
 621                 params.ssids[0].ssid_len = wpa_s->go_params->ssid_len;
 622                 params.num_ssids = 1;
 623                 goto ssid_list_set;
 624         }
 625 #endif /* CONFIG_P2P */
 626
 627         /* Find the starting point from which to continue scanning */
 628         ssid = wpa_s->conf->ssid;
 629         if (wpa_s->prev_scan_ssid != WILDCARD_SSID_SCAN) {
 630                 while (ssid) {
 631                         if (ssid == wpa_s->prev_scan_ssid) {
 632                                 ssid = ssid->next;
 633                                 break;
 634                         }
 635                         ssid = ssid->next;
 636                 }
 637         }
 638
 639         if (wpa_s->last_scan_req != MANUAL_SCAN_REQ &&
 640             wpa_s->conf->ap_scan == 2) {
 641                 wpa_s->connect_without_scan = NULL;
 642                 wpa_s->prev_scan_wildcard = 0;
 643                 wpa_supplicant_assoc_try(wpa_s, ssid);
 644                 return;
 645         } else if (wpa_s->conf->ap_scan == 2) {
 646                 /*
 647                  * User-initiated scan request in ap_scan == 2; scan with
 648                  * wildcard SSID.
 649                  */
 650                 ssid = NULL;
 651         } else {
 652                 struct wpa_ssid *start = ssid, *tssid;
 653                 int freqs_set = 0;
 654                 if (ssid == NULL && max_ssids > 1)
 655                         ssid = wpa_s->conf->ssid;
 656                 while (ssid) {
 657                         if (!wpas_network_disabled(wpa_s, ssid) &&
 658                             ssid->scan_ssid) {
 659                                 wpa_hexdump_ascii(MSG_DEBUG, "Scan SSID",
 660                                                   ssid->ssid, ssid->ssid_len);
 661                                 params.ssids[params.num_ssids].ssid =
 662                                         ssid->ssid;
 663                                 params.ssids[params.num_ssids].ssid_len =
 664                                         ssid->ssid_len;
 665                                 params.num_ssids++;
 666                                 if (params.num_ssids + 1 >= max_ssids)
 667                                         break;
 668                         }
 669                         ssid = ssid->next;
 670                         if (ssid == start)
 671                                 break;
 672                         if (ssid == NULL && max_ssids > 1 &&
 673                             start != wpa_s->conf->ssid)
 674                                 ssid = wpa_s->conf->ssid;
 675                 }
 676
 677                 for (tssid = wpa_s->conf->ssid; tssid; tssid = tssid->next) {
 678                         if (wpas_network_disabled(wpa_s, tssid))
 679                                 continue;
 680                         if ((params.freqs || !freqs_set) && tssid->scan_freq) {
 681                                 int_array_concat(&params.freqs,
 682                                                  tssid->scan_freq);
 683                         } else {
 684                                 os_free(params.freqs);
 685                                 params.freqs = NULL;
 686                         }
 687                         freqs_set = 1;
 688                 }
 689                 int_array_sort_unique(params.freqs);
 690         }
 691
 692         if (ssid && max_ssids == 1) {
 693                 /*
 694                  * If the driver is limited to 1 SSID at a time interleave
 695                  * wildcard SSID scans with specific SSID scans to avoid
 696                  * waiting a long time for a wildcard scan.
 697                  */
 698                 if (!wpa_s->prev_scan_wildcard) {
 699                         params.ssids[0].ssid = NULL;
 700                         params.ssids[0].ssid_len = 0;
 701                         wpa_s->prev_scan_wildcard = 1;
 702                         wpa_dbg(wpa_s, MSG_DEBUG, "Starting AP scan for "
 703                                 "wildcard SSID (Interleave with specific)");
 704                 } else {
 705                         wpa_s->prev_scan_ssid = ssid;
 706                         wpa_s->prev_scan_wildcard = 0;
 707                         wpa_dbg(wpa_s, MSG_DEBUG,
 708                                 "Starting AP scan for specific SSID: %s",
 709                                 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
 710                 }
 711         } else if (ssid) {
 712                 /* max_ssids > 1 */
 713
 714                 wpa_s->prev_scan_ssid = ssid;
 715                 wpa_dbg(wpa_s, MSG_DEBUG, "Include wildcard SSID in "
 716                         "the scan request");
 717                 params.num_ssids++;
 718         } else if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
 719                    wpa_s->manual_scan_passive && params.num_ssids == 0) {
 720                 wpa_dbg(wpa_s, MSG_DEBUG, "Use passive scan based on manual request");
 721         } else {
 722                 wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
 723                 params.num_ssids++;
 724                 wpa_dbg(wpa_s, MSG_DEBUG, "Starting AP scan for wildcard "
 725                         "SSID");
 726         }
 727 #ifdef CONFIG_P2P
 728 ssid_list_set:
 729 #endif /* CONFIG_P2P */
 730
 731         wpa_supplicant_optimize_freqs(wpa_s, &params);
 732         extra_ie = wpa_supplicant_extra_ies(wpa_s);
 733
 734         if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
 735             wpa_s->manual_scan_only_new)
 736                 params.only_new_results = 1;
 737
 738         if (wpa_s->last_scan_req == MANUAL_SCAN_REQ && params.freqs == NULL &&
 739             wpa_s->manual_scan_freqs) {
 740                 wpa_dbg(wpa_s, MSG_DEBUG, "Limit manual scan to specified channels");
 741                 params.freqs = wpa_s->manual_scan_freqs;
 742                 wpa_s->manual_scan_freqs = NULL;
 743         }
 744
 745         if (params.freqs == NULL && wpa_s->next_scan_freqs) {
 746                 wpa_dbg(wpa_s, MSG_DEBUG, "Optimize scan based on previously "
 747                         "generated frequency list");
 748                 params.freqs = wpa_s->next_scan_freqs;
 749         } else
 750                 os_free(wpa_s->next_scan_freqs);
 751         wpa_s->next_scan_freqs = NULL;
 752         wpa_setband_scan_freqs(wpa_s, &params);
 753
 754         /* See if user specified frequencies. If so, scan only those. */
 755         if (wpa_s->conf->freq_list && !params.freqs) {
 756                 wpa_dbg(wpa_s, MSG_DEBUG,
 757                         "Optimize scan based on conf->freq_list");
 758                 int_array_concat(&params.freqs, wpa_s->conf->freq_list);
 759         }
 760
 761         /* Use current associated channel? */
 762         if (wpa_s->conf->scan_cur_freq && !params.freqs) {
 763                 unsigned int num = wpa_s->num_multichan_concurrent;
 764
 765                 params.freqs = os_calloc(num + 1, sizeof(int));
 766                 if (params.freqs) {
 767                         num = get_shared_radio_freqs(wpa_s, params.freqs, num);
 768                         if (num > 0) {
 769                                 wpa_dbg(wpa_s, MSG_DEBUG, "Scan only the "
 770                                         "current operating channels since "
 771                                         "scan_cur_freq is enabled");
 772                         } else {
 773                                 os_free(params.freqs);
 774                                 params.freqs = NULL;
 775                         }
 776                 }
 777         }
 778
 779         params.filter_ssids = wpa_supplicant_build_filter_ssids(
 780                 wpa_s->conf, &params.num_filter_ssids);
 781         if (extra_ie) {
 782                 params.extra_ies = wpabuf_head(extra_ie);
 783                 params.extra_ies_len = wpabuf_len(extra_ie);
 784         }
 785
 786 #ifdef CONFIG_P2P
 787         if (wpa_s->p2p_in_provisioning ||
 788             (wpa_s->show_group_started && wpa_s->go_params)) {
 789                 /*
 790                  * The interface may not yet be in P2P mode, so we have to
 791                  * explicitly request P2P probe to disable CCK rates.
 792                  */
 793                 params.p2p_probe = 1;
 794         }
 795 #endif /* CONFIG_P2P */
 796
 797         scan_params = &params;
 798
 799 scan:
 800 #ifdef CONFIG_P2P
 801         /*
 802          * If the driver does not support multi-channel concurrency and a
 803          * virtual interface that shares the same radio with the wpa_s interface
 804          * is operating there may not be need to scan other channels apart from
 805          * the current operating channel on the other virtual interface. Filter
 806          * out other channels in case we are trying to find a connection for a
 807          * station interface when we are not configured to prefer station
 808          * connection and a concurrent operation is already in process.
 809          */
 810         if (wpa_s->scan_for_connection &&
 811             wpa_s->last_scan_req == NORMAL_SCAN_REQ &&
 812             !scan_params->freqs && !params.freqs &&
 813             wpas_is_p2p_prioritized(wpa_s) &&
 814             wpa_s->p2p_group_interface == NOT_P2P_GROUP_INTERFACE &&
 815             non_p2p_network_enabled(wpa_s)) {
 816                 unsigned int num = wpa_s->num_multichan_concurrent;
 817
 818                 params.freqs = os_calloc(num + 1, sizeof(int));
 819                 if (params.freqs) {
 820                         num = get_shared_radio_freqs(wpa_s, params.freqs, num);
 821                         if (num > 0 && num == wpa_s->num_multichan_concurrent) {
 822                                 wpa_dbg(wpa_s, MSG_DEBUG, "Scan only the current operating channels since all channels are already used");
 823                         } else {
 824                                 os_free(params.freqs);
 825                                 params.freqs = NULL;
 826                         }
 827                 }
 828         }
 829 #endif /* CONFIG_P2P */
 830
 831         ret = wpa_supplicant_trigger_scan(wpa_s, scan_params);
 832
 833         if (ret && wpa_s->last_scan_req == MANUAL_SCAN_REQ && params.freqs &&
 834             !wpa_s->manual_scan_freqs) {
 835                 /* Restore manual_scan_freqs for the next attempt */
 836                 wpa_s->manual_scan_freqs = params.freqs;
 837                 params.freqs = NULL;
 838         }
 839
 840         wpabuf_free(extra_ie);
 841         os_free(params.freqs);
 842         os_free(params.filter_ssids);
 843
 844         if (ret) {
 845                 wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate AP scan");
 846                 if (prev_state != wpa_s->wpa_state)
 847                         wpa_supplicant_set_state(wpa_s, prev_state);
 848                 /* Restore scan_req since we will try to scan again */
 849                 wpa_s->scan_req = wpa_s->last_scan_req;
 850                 wpa_supplicant_req_scan(wpa_s, 1, 0);
 851         } else {
 852                 wpa_s->scan_for_connection = 0;
 853         }
 854 }
 855
 856
 857 void wpa_supplicant_update_scan_int(struct wpa_supplicant *wpa_s, int sec)
 858 {
 859         struct os_reltime remaining, new_int;
 860         int cancelled;
 861
 862         cancelled = eloop_cancel_timeout_one(wpa_supplicant_scan, wpa_s, NULL,
 863                                              &remaining);
 864
 865         new_int.sec = sec;
 866         new_int.usec = 0;
 867         if (cancelled && os_reltime_before(&remaining, &new_int)) {
 868                 new_int.sec = remaining.sec;
 869                 new_int.usec = remaining.usec;
 870         }
 871
 872         if (cancelled) {
 873                 eloop_register_timeout(new_int.sec, new_int.usec,
 874                                        wpa_supplicant_scan, wpa_s, NULL);
 875         }
 876         wpa_s->scan_interval = sec;
 877 }
 878
 879
 880 /**
 881  * wpa_supplicant_req_scan - Schedule a scan for neighboring access points
 882  * @wpa_s: Pointer to wpa_supplicant data
 883  * @sec: Number of seconds after which to scan
 884  * @usec: Number of microseconds after which to scan
 885  *
 886  * This function is used to schedule a scan for neighboring access points after
 887  * the specified time.
 888  */
 889 void wpa_supplicant_req_scan(struct wpa_supplicant *wpa_s, int sec, int usec)
 890 {
 891         if (eloop_deplete_timeout(sec, usec, wpa_supplicant_scan, wpa_s, NULL))
 892         {
 893                 wpa_dbg(wpa_s, MSG_DEBUG, "Rescheduling scan request: %d sec %d usec",
 894                         sec, usec);
 895                 return;
 896         }
 897
 898         wpa_dbg(wpa_s, MSG_DEBUG, "Setting scan request: %d sec %d usec",
 899                 sec, usec);
 900         eloop_cancel_timeout(wpa_supplicant_scan, wpa_s, NULL);
 901         eloop_register_timeout(sec, usec, wpa_supplicant_scan, wpa_s, NULL);
 902 }
 903
 904
 905 /**
 906  * wpa_supplicant_delayed_sched_scan - Request a delayed scheduled scan
 907  * @wpa_s: Pointer to wpa_supplicant data
 908  * @sec: Number of seconds after which to scan
 909  * @usec: Number of microseconds after which to scan
 910  * Returns: 0 on success or -1 otherwise
 911  *
 912  * This function is used to schedule periodic scans for neighboring
 913  * access points after the specified time.
 914  */
 915 int wpa_supplicant_delayed_sched_scan(struct wpa_supplicant *wpa_s,
 916                                       int sec, int usec)
 917 {
 918         if (!wpa_s->sched_scan_supported)
 919                 return -1;
 920
 921         eloop_register_timeout(sec, usec,
 922                                wpa_supplicant_delayed_sched_scan_timeout,
 923                                wpa_s, NULL);
 924
 925         return 0;
 926 }
 927
 928
 929 /**
 930  * wpa_supplicant_req_sched_scan - Start a periodic scheduled scan
 931  * @wpa_s: Pointer to wpa_supplicant data
 932  * Returns: 0 is sched_scan was started or -1 otherwise
 933  *
 934  * This function is used to schedule periodic scans for neighboring
 935  * access points repeating the scan continuously.
 936  */
 937 int wpa_supplicant_req_sched_scan(struct wpa_supplicant *wpa_s)
 938 {
 939         struct wpa_driver_scan_params params;
 940         struct wpa_driver_scan_params *scan_params;
 941         enum wpa_states prev_state;
 942         struct wpa_ssid *ssid = NULL;
 943         struct wpabuf *extra_ie = NULL;
 944         int ret;
 945         unsigned int max_sched_scan_ssids;
 946         int wildcard = 0;
 947         int need_ssids;
 948
 949         if (!wpa_s->sched_scan_supported)
 950                 return -1;
 951
 952         if (wpa_s->max_sched_scan_ssids > WPAS_MAX_SCAN_SSIDS)
 953                 max_sched_scan_ssids = WPAS_MAX_SCAN_SSIDS;
 954         else
 955                 max_sched_scan_ssids = wpa_s->max_sched_scan_ssids;
 956         if (max_sched_scan_ssids < 1 || wpa_s->conf->disable_scan_offload)
 957                 return -1;
 958
 959         if (wpa_s->sched_scanning) {
 960                 wpa_dbg(wpa_s, MSG_DEBUG, "Already sched scanning");
 961                 return 0;
 962         }
 963
 964         need_ssids = 0;
 965         for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
 966                 if (!wpas_network_disabled(wpa_s, ssid) && !ssid->scan_ssid) {
 967                         /* Use wildcard SSID to find this network */
 968                         wildcard = 1;
 969                 } else if (!wpas_network_disabled(wpa_s, ssid) &&
 970                            ssid->ssid_len)
 971                         need_ssids++;
 972
 973 #ifdef CONFIG_WPS
 974                 if (!wpas_network_disabled(wpa_s, ssid) &&
 975                     ssid->key_mgmt == WPA_KEY_MGMT_WPS) {
 976                         /*
 977                          * Normal scan is more reliable and faster for WPS
 978                          * operations and since these are for short periods of
 979                          * time, the benefit of trying to use sched_scan would
 980                          * be limited.
 981                          */
 982                         wpa_dbg(wpa_s, MSG_DEBUG, "Use normal scan instead of "
 983                                 "sched_scan for WPS");
 984                         return -1;
 985                 }
 986 #endif /* CONFIG_WPS */
 987         }
 988         if (wildcard)
 989                 need_ssids++;
 990
 991         if (wpa_s->normal_scans < 3 &&
 992             (need_ssids <= wpa_s->max_scan_ssids ||
 993              wpa_s->max_scan_ssids >= (int) max_sched_scan_ssids)) {
 994                 /*
 995                  * When normal scan can speed up operations, use that for the
 996                  * first operations before starting the sched_scan to allow
 997                  * user space sleep more. We do this only if the normal scan
 998                  * has functionality that is suitable for this or if the
 999                  * sched_scan does not have better support for multiple SSIDs.
1000                  */
1001                 wpa_dbg(wpa_s, MSG_DEBUG, "Use normal scan instead of "
1002                         "sched_scan for initial scans (normal_scans=%d)",
1003                         wpa_s->normal_scans);
1004                 return -1;
1005         }
1006
1007         os_memset(&params, 0, sizeof(params));
1008
1009         /* If we can't allocate space for the filters, we just don't filter */
1010         params.filter_ssids = os_zalloc(wpa_s->max_match_sets *
1011                                         sizeof(struct wpa_driver_scan_filter));
1012
1013         prev_state = wpa_s->wpa_state;
1014         if (wpa_s->wpa_state == WPA_DISCONNECTED ||
1015             wpa_s->wpa_state == WPA_INACTIVE)
1016                 wpa_supplicant_set_state(wpa_s, WPA_SCANNING);
1017
1018         if (wpa_s->autoscan_params != NULL) {
1019                 scan_params = wpa_s->autoscan_params;
1020                 goto scan;
1021         }
1022
1023         /* Find the starting point from which to continue scanning */
1024         ssid = wpa_s->conf->ssid;
1025         if (wpa_s->prev_sched_ssid) {
1026                 while (ssid) {
1027                         if (ssid == wpa_s->prev_sched_ssid) {
1028                                 ssid = ssid->next;
1029                                 break;
1030                         }
1031                         ssid = ssid->next;
1032                 }
1033         }
1034
1035         if (!ssid || !wpa_s->prev_sched_ssid) {
1036                 wpa_dbg(wpa_s, MSG_DEBUG, "Beginning of SSID list");
1037                 if (wpa_s->conf->sched_scan_interval)
1038                         wpa_s->sched_scan_interval =
1039                                 wpa_s->conf->sched_scan_interval;
1040                 if (wpa_s->sched_scan_interval == 0)
1041                         wpa_s->sched_scan_interval = 10;
1042                 wpa_s->sched_scan_timeout = max_sched_scan_ssids * 2;
1043                 wpa_s->first_sched_scan = 1;
1044                 ssid = wpa_s->conf->ssid;
1045                 wpa_s->prev_sched_ssid = ssid;
1046         }
1047
1048         if (wildcard) {
1049                 wpa_dbg(wpa_s, MSG_DEBUG, "Add wildcard SSID to sched_scan");
1050                 params.num_ssids++;
1051         }
1052
1053         while (ssid) {
1054                 if (wpas_network_disabled(wpa_s, ssid))
1055                         goto next;
1056
1057                 if (params.num_filter_ssids < wpa_s->max_match_sets &&
1058                     params.filter_ssids && ssid->ssid && ssid->ssid_len) {
1059                         wpa_dbg(wpa_s, MSG_DEBUG, "add to filter ssid: %s",
1060                                 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
1061                         os_memcpy(params.filter_ssids[params.num_filter_ssids].ssid,
1062                                   ssid->ssid, ssid->ssid_len);
1063                         params.filter_ssids[params.num_filter_ssids].ssid_len =
1064                                 ssid->ssid_len;
1065                         params.num_filter_ssids++;
1066                 } else if (params.filter_ssids && ssid->ssid && ssid->ssid_len)
1067                 {
1068                         wpa_dbg(wpa_s, MSG_DEBUG, "Not enough room for SSID "
1069                                 "filter for sched_scan - drop filter");
1070                         os_free(params.filter_ssids);
1071                         params.filter_ssids = NULL;
1072                         params.num_filter_ssids = 0;
1073                 }
1074
1075                 if (ssid->scan_ssid && ssid->ssid && ssid->ssid_len) {
1076                         if (params.num_ssids == max_sched_scan_ssids)
1077                                 break; /* only room for broadcast SSID */
1078                         wpa_dbg(wpa_s, MSG_DEBUG,
1079                                 "add to active scan ssid: %s",
1080                                 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
1081                         params.ssids[params.num_ssids].ssid =
1082                                 ssid->ssid;
1083                         params.ssids[params.num_ssids].ssid_len =
1084                                 ssid->ssid_len;
1085                         params.num_ssids++;
1086                         if (params.num_ssids >= max_sched_scan_ssids) {
1087                                 wpa_s->prev_sched_ssid = ssid;
1088                                 do {
1089                                         ssid = ssid->next;
1090                                 } while (ssid &&
1091                                          (wpas_network_disabled(wpa_s, ssid) ||
1092                                           !ssid->scan_ssid));
1093                                 break;
1094                         }
1095                 }
1096
1097         next:
1098                 wpa_s->prev_sched_ssid = ssid;
1099                 ssid = ssid->next;
1100         }
1101
1102         if (params.num_filter_ssids == 0) {
1103                 os_free(params.filter_ssids);
1104                 params.filter_ssids = NULL;
1105         }
1106
1107         extra_ie = wpa_supplicant_extra_ies(wpa_s);
1108         if (extra_ie) {
1109                 params.extra_ies = wpabuf_head(extra_ie);
1110                 params.extra_ies_len = wpabuf_len(extra_ie);
1111         }
1112
1113         scan_params = &params;
1114
1115 scan:
1116         if (ssid || !wpa_s->first_sched_scan) {
1117                 wpa_dbg(wpa_s, MSG_DEBUG,
1118                         "Starting sched scan: interval %d timeout %d",
1119                         wpa_s->sched_scan_interval, wpa_s->sched_scan_timeout);
1120         } else {
1121                 wpa_dbg(wpa_s, MSG_DEBUG,
1122                         "Starting sched scan: interval %d (no timeout)",
1123                         wpa_s->sched_scan_interval);
1124         }
1125
1126         wpa_setband_scan_freqs(wpa_s, scan_params);
1127
1128         ret = wpa_supplicant_start_sched_scan(wpa_s, scan_params,
1129                                               wpa_s->sched_scan_interval);
1130         wpabuf_free(extra_ie);
1131         os_free(params.filter_ssids);
1132         if (ret) {
1133                 wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate sched scan");
1134                 if (prev_state != wpa_s->wpa_state)
1135                         wpa_supplicant_set_state(wpa_s, prev_state);
1136                 return ret;
1137         }
1138
1139         /* If we have more SSIDs to scan, add a timeout so we scan them too */
1140         if (ssid || !wpa_s->first_sched_scan) {
1141                 wpa_s->sched_scan_timed_out = 0;
1142                 eloop_register_timeout(wpa_s->sched_scan_timeout, 0,
1143                                        wpa_supplicant_sched_scan_timeout,
1144                                        wpa_s, NULL);
1145                 wpa_s->first_sched_scan = 0;
1146                 wpa_s->sched_scan_timeout /= 2;
1147                 wpa_s->sched_scan_interval *= 2;
1148                 if (wpa_s->sched_scan_timeout < wpa_s->sched_scan_interval) {
1149                         wpa_s->sched_scan_interval = 10;
1150                         wpa_s->sched_scan_timeout = max_sched_scan_ssids * 2;
1151                 }
1152         }
1153
1154         /* If there is no more ssids, start next time from the beginning */
1155         if (!ssid)
1156                 wpa_s->prev_sched_ssid = NULL;
1157
1158         return 0;
1159 }
1160
1161
1162 /**
1163  * wpa_supplicant_cancel_scan - Cancel a scheduled scan request
1164  * @wpa_s: Pointer to wpa_supplicant data
1165  *
1166  * This function is used to cancel a scan request scheduled with
1167  * wpa_supplicant_req_scan().
1168  */
1169 void wpa_supplicant_cancel_scan(struct wpa_supplicant *wpa_s)
1170 {
1171         wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling scan request");
1172         eloop_cancel_timeout(wpa_supplicant_scan, wpa_s, NULL);
1173 }
1174
1175
1176 /**
1177  * wpa_supplicant_cancel_delayed_sched_scan - Stop a delayed scheduled scan
1178  * @wpa_s: Pointer to wpa_supplicant data
1179  *
1180  * This function is used to stop a delayed scheduled scan.
1181  */
1182 void wpa_supplicant_cancel_delayed_sched_scan(struct wpa_supplicant *wpa_s)
1183 {
1184         if (!wpa_s->sched_scan_supported)
1185                 return;
1186
1187         wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling delayed sched scan");
1188         eloop_cancel_timeout(wpa_supplicant_delayed_sched_scan_timeout,
1189                              wpa_s, NULL);
1190 }
1191
1192
1193 /**
1194  * wpa_supplicant_cancel_sched_scan - Stop running scheduled scans
1195  * @wpa_s: Pointer to wpa_supplicant data
1196  *
1197  * This function is used to stop a periodic scheduled scan.
1198  */
1199 void wpa_supplicant_cancel_sched_scan(struct wpa_supplicant *wpa_s)
1200 {
1201         if (!wpa_s->sched_scanning)
1202                 return;
1203
1204         wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling sched scan");
1205         eloop_cancel_timeout(wpa_supplicant_sched_scan_timeout, wpa_s, NULL);
1206         wpa_supplicant_stop_sched_scan(wpa_s);
1207 }
1208
1209
1210 /**
1211  * wpa_supplicant_notify_scanning - Indicate possible scan state change
1212  * @wpa_s: Pointer to wpa_supplicant data
1213  * @scanning: Whether scanning is currently in progress
1214  *
1215  * This function is to generate scanning notifycations. It is called whenever
1216  * there may have been a change in scanning (scan started, completed, stopped).
1217  * wpas_notify_scanning() is called whenever the scanning state changed from the
1218  * previously notified state.
1219  */
1220 void wpa_supplicant_notify_scanning(struct wpa_supplicant *wpa_s,
1221                                     int scanning)
1222 {
1223         if (wpa_s->scanning != scanning) {
1224                 wpa_s->scanning = scanning;
1225                 wpas_notify_scanning(wpa_s);
1226         }
1227 }
1228
1229
1230 static int wpa_scan_get_max_rate(const struct wpa_scan_res *res)
1231 {
1232         int rate = 0;
1233         const u8 *ie;
1234         int i;
1235
1236         ie = wpa_scan_get_ie(res, WLAN_EID_SUPP_RATES);
1237         for (i = 0; ie && i < ie[1]; i++) {
1238                 if ((ie[i + 2] & 0x7f) > rate)
1239                         rate = ie[i + 2] & 0x7f;
1240         }
1241
1242         ie = wpa_scan_get_ie(res, WLAN_EID_EXT_SUPP_RATES);
1243         for (i = 0; ie && i < ie[1]; i++) {
1244                 if ((ie[i + 2] & 0x7f) > rate)
1245                         rate = ie[i + 2] & 0x7f;
1246         }
1247
1248         return rate;
1249 }
1250
1251
1252 /**
1253  * wpa_scan_get_ie - Fetch a specified information element from a scan result
1254  * @res: Scan result entry
1255  * @ie: Information element identitifier (WLAN_EID_*)
1256  * Returns: Pointer to the information element (id field) or %NULL if not found
1257  *
1258  * This function returns the first matching information element in the scan
1259  * result.
1260  */
1261 const u8 * wpa_scan_get_ie(const struct wpa_scan_res *res, u8 ie)
1262 {
1263         const u8 *end, *pos;
1264
1265         pos = (const u8 *) (res + 1);
1266         end = pos + res->ie_len;
1267
1268         while (pos + 1 < end) {
1269                 if (pos + 2 + pos[1] > end)
1270                         break;
1271                 if (pos[0] == ie)
1272                         return pos;
1273                 pos += 2 + pos[1];
1274         }
1275
1276         return NULL;
1277 }
1278
1279
1280 /**
1281  * wpa_scan_get_vendor_ie - Fetch vendor information element from a scan result
1282  * @res: Scan result entry
1283  * @vendor_type: Vendor type (four octets starting the IE payload)
1284  * Returns: Pointer to the information element (id field) or %NULL if not found
1285  *
1286  * This function returns the first matching information element in the scan
1287  * result.
1288  */
1289 const u8 * wpa_scan_get_vendor_ie(const struct wpa_scan_res *res,
1290                                   u32 vendor_type)
1291 {
1292         const u8 *end, *pos;
1293
1294         pos = (const u8 *) (res + 1);
1295         end = pos + res->ie_len;
1296
1297         while (pos + 1 < end) {
1298                 if (pos + 2 + pos[1] > end)
1299                         break;
1300                 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1301                     vendor_type == WPA_GET_BE32(&pos[2]))
1302                         return pos;
1303                 pos += 2 + pos[1];
1304         }
1305
1306         return NULL;
1307 }
1308
1309
1310 /**
1311  * wpa_scan_get_vendor_ie_beacon - Fetch vendor information from a scan result
1312  * @res: Scan result entry
1313  * @vendor_type: Vendor type (four octets starting the IE payload)
1314  * Returns: Pointer to the information element (id field) or %NULL if not found
1315  *
1316  * This function returns the first matching information element in the scan
1317  * result.
1318  *
1319  * This function is like wpa_scan_get_vendor_ie(), but uses IE buffer only
1320  * from Beacon frames instead of either Beacon or Probe Response frames.
1321  */
1322 const u8 * wpa_scan_get_vendor_ie_beacon(const struct wpa_scan_res *res,
1323                                          u32 vendor_type)
1324 {
1325         const u8 *end, *pos;
1326
1327         if (res->beacon_ie_len == 0)
1328                 return NULL;
1329
1330         pos = (const u8 *) (res + 1);
1331         pos += res->ie_len;
1332         end = pos + res->beacon_ie_len;
1333
1334         while (pos + 1 < end) {
1335                 if (pos + 2 + pos[1] > end)
1336                         break;
1337                 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1338                     vendor_type == WPA_GET_BE32(&pos[2]))
1339                         return pos;
1340                 pos += 2 + pos[1];
1341         }
1342
1343         return NULL;
1344 }
1345
1346
1347 /**
1348  * wpa_scan_get_vendor_ie_multi - Fetch vendor IE data from a scan result
1349  * @res: Scan result entry
1350  * @vendor_type: Vendor type (four octets starting the IE payload)
1351  * Returns: Pointer to the information element payload or %NULL if not found
1352  *
1353  * This function returns concatenated payload of possibly fragmented vendor
1354  * specific information elements in the scan result. The caller is responsible
1355  * for freeing the returned buffer.
1356  */
1357 struct wpabuf * wpa_scan_get_vendor_ie_multi(const struct wpa_scan_res *res,
1358                                              u32 vendor_type)
1359 {
1360         struct wpabuf *buf;
1361         const u8 *end, *pos;
1362
1363         buf = wpabuf_alloc(res->ie_len);
1364         if (buf == NULL)
1365                 return NULL;
1366
1367         pos = (const u8 *) (res + 1);
1368         end = pos + res->ie_len;
1369
1370         while (pos + 1 < end) {
1371                 if (pos + 2 + pos[1] > end)
1372                         break;
1373                 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1374                     vendor_type == WPA_GET_BE32(&pos[2]))
1375                         wpabuf_put_data(buf, pos + 2 + 4, pos[1] - 4);
1376                 pos += 2 + pos[1];
1377         }
1378
1379         if (wpabuf_len(buf) == 0) {
1380                 wpabuf_free(buf);
1381                 buf = NULL;
1382         }
1383
1384         return buf;
1385 }
1386
1387
1388 /*
1389  * Channels with a great SNR can operate at full rate. What is a great SNR?
1390  * This doc https://supportforums.cisco.com/docs/DOC-12954 says, "the general
1391  * rule of thumb is that any SNR above 20 is good." This one
1392  * http://www.cisco.com/en/US/tech/tk722/tk809/technologies_q_and_a_item09186a00805e9a96.shtml#qa23
1393  * recommends 25 as a minimum SNR for 54 Mbps data rate. 30 is chosen here as a
1394  * conservative value.
1395  */
1396 #define GREAT_SNR 30
1397
1398 /* Compare function for sorting scan results. Return >0 if @b is considered
1399  * better. */
1400 static int wpa_scan_result_compar(const void *a, const void *b)
1401 {
1402 #define IS_5GHZ(n) (n > 4000)
1403 #define MIN(a,b) a < b ? a : b
1404         struct wpa_scan_res **_wa = (void *) a;
1405         struct wpa_scan_res **_wb = (void *) b;
1406         struct wpa_scan_res *wa = *_wa;
1407         struct wpa_scan_res *wb = *_wb;
1408         int wpa_a, wpa_b, maxrate_a, maxrate_b;
1409         int snr_a, snr_b;
1410
1411         /* WPA/WPA2 support preferred */
1412         wpa_a = wpa_scan_get_vendor_ie(wa, WPA_IE_VENDOR_TYPE) != NULL ||
1413                 wpa_scan_get_ie(wa, WLAN_EID_RSN) != NULL;
1414         wpa_b = wpa_scan_get_vendor_ie(wb, WPA_IE_VENDOR_TYPE) != NULL ||
1415                 wpa_scan_get_ie(wb, WLAN_EID_RSN) != NULL;
1416
1417         if (wpa_b && !wpa_a)
1418                 return 1;
1419         if (!wpa_b && wpa_a)
1420                 return -1;
1421
1422         /* privacy support preferred */
1423         if ((wa->caps & IEEE80211_CAP_PRIVACY) == 0 &&
1424             (wb->caps & IEEE80211_CAP_PRIVACY))
1425                 return 1;
1426         if ((wa->caps & IEEE80211_CAP_PRIVACY) &&
1427             (wb->caps & IEEE80211_CAP_PRIVACY) == 0)
1428                 return -1;
1429
1430         if ((wa->flags & wb->flags & WPA_SCAN_LEVEL_DBM) &&
1431             !((wa->flags | wb->flags) & WPA_SCAN_NOISE_INVALID)) {
1432                 snr_a = MIN(wa->level - wa->noise, GREAT_SNR);
1433                 snr_b = MIN(wb->level - wb->noise, GREAT_SNR);
1434         } else {
1435                 /* Not suitable information to calculate SNR, so use level */
1436                 snr_a = wa->level;
1437                 snr_b = wb->level;
1438         }
1439
1440         /* best/max rate preferred if SNR close enough */
1441         if ((snr_a && snr_b && abs(snr_b - snr_a) < 5) ||
1442             (wa->qual && wb->qual && abs(wb->qual - wa->qual) < 10)) {
1443                 maxrate_a = wpa_scan_get_max_rate(wa);
1444                 maxrate_b = wpa_scan_get_max_rate(wb);
1445                 if (maxrate_a != maxrate_b)
1446                         return maxrate_b - maxrate_a;
1447                 if (IS_5GHZ(wa->freq) ^ IS_5GHZ(wb->freq))
1448                         return IS_5GHZ(wa->freq) ? -1 : 1;
1449         }
1450
1451         /* use freq for channel preference */
1452
1453         /* all things being equal, use SNR; if SNRs are
1454          * identical, use quality values since some drivers may only report
1455          * that value and leave the signal level zero */
1456         if (snr_b == snr_a)
1457                 return wb->qual - wa->qual;
1458         return snr_b - snr_a;
1459 #undef MIN
1460 #undef IS_5GHZ
1461 }
1462
1463
1464 #ifdef CONFIG_WPS
1465 /* Compare function for sorting scan results when searching a WPS AP for
1466  * provisioning. Return >0 if @b is considered better. */
1467 static int wpa_scan_result_wps_compar(const void *a, const void *b)
1468 {
1469         struct wpa_scan_res **_wa = (void *) a;
1470         struct wpa_scan_res **_wb = (void *) b;
1471         struct wpa_scan_res *wa = *_wa;
1472         struct wpa_scan_res *wb = *_wb;
1473         int uses_wps_a, uses_wps_b;
1474         struct wpabuf *wps_a, *wps_b;
1475         int res;
1476
1477         /* Optimization - check WPS IE existence before allocated memory and
1478          * doing full reassembly. */
1479         uses_wps_a = wpa_scan_get_vendor_ie(wa, WPS_IE_VENDOR_TYPE) != NULL;
1480         uses_wps_b = wpa_scan_get_vendor_ie(wb, WPS_IE_VENDOR_TYPE) != NULL;
1481         if (uses_wps_a && !uses_wps_b)
1482                 return -1;
1483         if (!uses_wps_a && uses_wps_b)
1484                 return 1;
1485
1486         if (uses_wps_a && uses_wps_b) {
1487                 wps_a = wpa_scan_get_vendor_ie_multi(wa, WPS_IE_VENDOR_TYPE);
1488                 wps_b = wpa_scan_get_vendor_ie_multi(wb, WPS_IE_VENDOR_TYPE);
1489                 res = wps_ap_priority_compar(wps_a, wps_b);
1490                 wpabuf_free(wps_a);
1491                 wpabuf_free(wps_b);
1492                 if (res)
1493                         return res;
1494         }
1495
1496         /*
1497          * Do not use current AP security policy as a sorting criteria during
1498          * WPS provisioning step since the AP may get reconfigured at the
1499          * completion of provisioning.
1500          */
1501
1502         /* all things being equal, use signal level; if signal levels are
1503          * identical, use quality values since some drivers may only report
1504          * that value and leave the signal level zero */
1505         if (wb->level == wa->level)
1506                 return wb->qual - wa->qual;
1507         return wb->level - wa->level;
1508 }
1509 #endif /* CONFIG_WPS */
1510
1511
1512 static void dump_scan_res(struct wpa_scan_results *scan_res)
1513 {
1514 #ifndef CONFIG_NO_STDOUT_DEBUG
1515         size_t i;
1516
1517         if (scan_res->res == NULL || scan_res->num == 0)
1518                 return;
1519
1520         wpa_printf(MSG_EXCESSIVE, "Sorted scan results");
1521
1522         for (i = 0; i < scan_res->num; i++) {
1523                 struct wpa_scan_res *r = scan_res->res[i];
1524                 u8 *pos;
1525                 if ((r->flags & (WPA_SCAN_LEVEL_DBM | WPA_SCAN_NOISE_INVALID))
1526                     == WPA_SCAN_LEVEL_DBM) {
1527                         int snr = r->level - r->noise;
1528                         wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d "
1529                                    "noise=%d level=%d snr=%d%s flags=0x%x "
1530                                    "age=%u",
1531                                    MAC2STR(r->bssid), r->freq, r->qual,
1532                                    r->noise, r->level, snr,
1533                                    snr >= GREAT_SNR ? "*" : "", r->flags,
1534                                    r->age);
1535                 } else {
1536                         wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d "
1537                                    "noise=%d level=%d flags=0x%x age=%u",
1538                                    MAC2STR(r->bssid), r->freq, r->qual,
1539                                    r->noise, r->level, r->flags, r->age);
1540                 }
1541                 pos = (u8 *) (r + 1);
1542                 if (r->ie_len)
1543                         wpa_hexdump(MSG_EXCESSIVE, "IEs", pos, r->ie_len);
1544                 pos += r->ie_len;
1545                 if (r->beacon_ie_len)
1546                         wpa_hexdump(MSG_EXCESSIVE, "Beacon IEs",
1547                                     pos, r->beacon_ie_len);
1548         }
1549 #endif /* CONFIG_NO_STDOUT_DEBUG */
1550 }
1551
1552
1553 /**
1554  * wpa_supplicant_filter_bssid_match - Is the specified BSSID allowed
1555  * @wpa_s: Pointer to wpa_supplicant data
1556  * @bssid: BSSID to check
1557  * Returns: 0 if the BSSID is filtered or 1 if not
1558  *
1559  * This function is used to filter out specific BSSIDs from scan reslts mainly
1560  * for testing purposes (SET bssid_filter ctrl_iface command).
1561  */
1562 int wpa_supplicant_filter_bssid_match(struct wpa_supplicant *wpa_s,
1563                                       const u8 *bssid)
1564 {
1565         size_t i;
1566
1567         if (wpa_s->bssid_filter == NULL)
1568                 return 1;
1569
1570         for (i = 0; i < wpa_s->bssid_filter_count; i++) {
1571                 if (os_memcmp(wpa_s->bssid_filter + i * ETH_ALEN, bssid,
1572                               ETH_ALEN) == 0)
1573                         return 1;
1574         }
1575
1576         return 0;
1577 }
1578
1579
1580 static void filter_scan_res(struct wpa_supplicant *wpa_s,
1581                             struct wpa_scan_results *res)
1582 {
1583         size_t i, j;
1584
1585         if (wpa_s->bssid_filter == NULL)
1586                 return;
1587
1588         for (i = 0, j = 0; i < res->num; i++) {
1589                 if (wpa_supplicant_filter_bssid_match(wpa_s,
1590                                                       res->res[i]->bssid)) {
1591                         res->res[j++] = res->res[i];
1592                 } else {
1593                         os_free(res->res[i]);
1594                         res->res[i] = NULL;
1595                 }
1596         }
1597
1598         if (res->num != j) {
1599                 wpa_printf(MSG_DEBUG, "Filtered out %d scan results",
1600                            (int) (res->num - j));
1601                 res->num = j;
1602         }
1603 }
1604
1605
1606 /**
1607  * wpa_supplicant_get_scan_results - Get scan results
1608  * @wpa_s: Pointer to wpa_supplicant data
1609  * @info: Information about what was scanned or %NULL if not available
1610  * @new_scan: Whether a new scan was performed
1611  * Returns: Scan results, %NULL on failure
1612  *
1613  * This function request the current scan results from the driver and updates
1614  * the local BSS list wpa_s->bss. The caller is responsible for freeing the
1615  * results with wpa_scan_results_free().
1616  */
1617 struct wpa_scan_results *
1618 wpa_supplicant_get_scan_results(struct wpa_supplicant *wpa_s,
1619                                 struct scan_info *info, int new_scan)
1620 {
1621         struct wpa_scan_results *scan_res;
1622         size_t i;
1623         int (*compar)(const void *, const void *) = wpa_scan_result_compar;
1624
1625         scan_res = wpa_drv_get_scan_results2(wpa_s);
1626         if (scan_res == NULL) {
1627                 wpa_dbg(wpa_s, MSG_DEBUG, "Failed to get scan results");
1628                 return NULL;
1629         }
1630         if (scan_res->fetch_time.sec == 0) {
1631                 /*
1632                  * Make sure we have a valid timestamp if the driver wrapper
1633                  * does not set this.
1634                  */
1635                 os_get_reltime(&scan_res->fetch_time);
1636         }
1637         filter_scan_res(wpa_s, scan_res);
1638
1639 #ifdef CONFIG_WPS
1640         if (wpas_wps_searching(wpa_s)) {
1641                 wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Order scan results with WPS "
1642                         "provisioning rules");
1643                 compar = wpa_scan_result_wps_compar;
1644         }
1645 #endif /* CONFIG_WPS */
1646
1647         qsort(scan_res->res, scan_res->num, sizeof(struct wpa_scan_res *),
1648               compar);
1649         dump_scan_res(scan_res);
1650
1651         wpa_bss_update_start(wpa_s);
1652         for (i = 0; i < scan_res->num; i++)
1653                 wpa_bss_update_scan_res(wpa_s, scan_res->res[i],
1654                                         &scan_res->fetch_time);
1655         wpa_bss_update_end(wpa_s, info, new_scan);
1656
1657         return scan_res;
1658 }
1659
1660
1661 /**
1662  * wpa_supplicant_update_scan_results - Update scan results from the driver
1663  * @wpa_s: Pointer to wpa_supplicant data
1664  * Returns: 0 on success, -1 on failure
1665  *
1666  * This function updates the BSS table within wpa_supplicant based on the
1667  * currently available scan results from the driver without requesting a new
1668  * scan. This is used in cases where the driver indicates an association
1669  * (including roaming within ESS) and wpa_supplicant does not yet have the
1670  * needed information to complete the connection (e.g., to perform validation
1671  * steps in 4-way handshake).
1672  */
1673 int wpa_supplicant_update_scan_results(struct wpa_supplicant *wpa_s)
1674 {
1675         struct wpa_scan_results *scan_res;
1676         scan_res = wpa_supplicant_get_scan_results(wpa_s, NULL, 0);
1677         if (scan_res == NULL)
1678                 return -1;
1679         wpa_scan_results_free(scan_res);
1680
1681         return 0;
1682 }
1683
1684
1685 /**
1686  * scan_only_handler - Reports scan results
1687  */
1688 void scan_only_handler(struct wpa_supplicant *wpa_s,
1689                        struct wpa_scan_results *scan_res)
1690 {
1691         wpa_dbg(wpa_s, MSG_DEBUG, "Scan-only results received");
1692         if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
1693             wpa_s->manual_scan_use_id && wpa_s->own_scan_running) {
1694                 wpa_msg_ctrl(wpa_s, MSG_INFO, WPA_EVENT_SCAN_RESULTS "id=%u",
1695                              wpa_s->manual_scan_id);
1696                 wpa_s->manual_scan_use_id = 0;
1697         } else {
1698                 wpa_msg_ctrl(wpa_s, MSG_INFO, WPA_EVENT_SCAN_RESULTS);
1699         }
1700         wpas_notify_scan_results(wpa_s);
1701         wpas_notify_scan_done(wpa_s, 1);
1702         if (wpa_s->scan_work) {
1703                 struct wpa_radio_work *work = wpa_s->scan_work;
1704                 wpa_s->scan_work = NULL;
1705                 radio_work_done(work);
1706         }
1707 }
1708
1709
1710 int wpas_scan_scheduled(struct wpa_supplicant *wpa_s)
1711 {
1712         return eloop_is_timeout_registered(wpa_supplicant_scan, wpa_s, NULL);
1713 }
1714
1715
1716 struct wpa_driver_scan_params *
1717 wpa_scan_clone_params(const struct wpa_driver_scan_params *src)
1718 {
1719         struct wpa_driver_scan_params *params;
1720         size_t i;
1721         u8 *n;
1722
1723         params = os_zalloc(sizeof(*params));
1724         if (params == NULL)
1725                 return NULL;
1726
1727         for (i = 0; i < src->num_ssids; i++) {
1728                 if (src->ssids[i].ssid) {
1729                         n = os_malloc(src->ssids[i].ssid_len);
1730                         if (n == NULL)
1731                                 goto failed;
1732                         os_memcpy(n, src->ssids[i].ssid,
1733                                   src->ssids[i].ssid_len);
1734                         params->ssids[i].ssid = n;
1735                         params->ssids[i].ssid_len = src->ssids[i].ssid_len;
1736                 }
1737         }
1738         params->num_ssids = src->num_ssids;
1739
1740         if (src->extra_ies) {
1741                 n = os_malloc(src->extra_ies_len);
1742                 if (n == NULL)
1743                         goto failed;
1744                 os_memcpy(n, src->extra_ies, src->extra_ies_len);
1745                 params->extra_ies = n;
1746                 params->extra_ies_len = src->extra_ies_len;
1747         }
1748
1749         if (src->freqs) {
1750                 int len = int_array_len(src->freqs);
1751                 params->freqs = os_malloc((len + 1) * sizeof(int));
1752                 if (params->freqs == NULL)
1753                         goto failed;
1754                 os_memcpy(params->freqs, src->freqs, (len + 1) * sizeof(int));
1755         }
1756
1757         if (src->filter_ssids) {
1758                 params->filter_ssids = os_malloc(sizeof(params->filter_ssids) *
1759                                                  src->num_filter_ssids);
1760                 if (params->filter_ssids == NULL)
1761                         goto failed;
1762                 os_memcpy(params->filter_ssids, src->filter_ssids,
1763                           sizeof(params->filter_ssids) * src->num_filter_ssids);
1764                 params->num_filter_ssids = src->num_filter_ssids;
1765         }
1766
1767         params->filter_rssi = src->filter_rssi;
1768         params->p2p_probe = src->p2p_probe;
1769         params->only_new_results = src->only_new_results;
1770
1771         return params;
1772
1773 failed:
1774         wpa_scan_free_params(params);
1775         return NULL;
1776 }
1777
1778
1779 void wpa_scan_free_params(struct wpa_driver_scan_params *params)
1780 {
1781         size_t i;
1782
1783         if (params == NULL)
1784                 return;
1785
1786         for (i = 0; i < params->num_ssids; i++)
1787                 os_free((u8 *) params->ssids[i].ssid);
1788         os_free((u8 *) params->extra_ies);
1789         os_free(params->freqs);
1790         os_free(params->filter_ssids);
1791         os_free(params);
1792 }