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         int res = eloop_deplete_timeout(sec, usec, wpa_supplicant_scan, wpa_s,
 892                                         NULL);
 893         if (res == 1) {
 894                 wpa_dbg(wpa_s, MSG_DEBUG, "Rescheduling scan request: %d.%06d sec",
 895                         sec, usec);
 896         } else if (res == 0) {
 897                 wpa_dbg(wpa_s, MSG_DEBUG, "Ignore new scan request for %d.%06d sec since an earlier request is scheduled to trigger sooner",
 898                         sec, usec);
 899         } else {
 900                 wpa_dbg(wpa_s, MSG_DEBUG, "Setting scan request: %d.%06d sec",
 901                         sec, usec);
 902                 eloop_register_timeout(sec, usec, wpa_supplicant_scan, wpa_s, NULL);
 903         }
 904 }
 905
 906
 907 /**
 908  * wpa_supplicant_delayed_sched_scan - Request a delayed scheduled scan
 909  * @wpa_s: Pointer to wpa_supplicant data
 910  * @sec: Number of seconds after which to scan
 911  * @usec: Number of microseconds after which to scan
 912  * Returns: 0 on success or -1 otherwise
 913  *
 914  * This function is used to schedule periodic scans for neighboring
 915  * access points after the specified time.
 916  */
 917 int wpa_supplicant_delayed_sched_scan(struct wpa_supplicant *wpa_s,
 918                                       int sec, int usec)
 919 {
 920         if (!wpa_s->sched_scan_supported)
 921                 return -1;
 922
 923         eloop_register_timeout(sec, usec,
 924                                wpa_supplicant_delayed_sched_scan_timeout,
 925                                wpa_s, NULL);
 926
 927         return 0;
 928 }
 929
 930
 931 /**
 932  * wpa_supplicant_req_sched_scan - Start a periodic scheduled scan
 933  * @wpa_s: Pointer to wpa_supplicant data
 934  * Returns: 0 is sched_scan was started or -1 otherwise
 935  *
 936  * This function is used to schedule periodic scans for neighboring
 937  * access points repeating the scan continuously.
 938  */
 939 int wpa_supplicant_req_sched_scan(struct wpa_supplicant *wpa_s)
 940 {
 941         struct wpa_driver_scan_params params;
 942         struct wpa_driver_scan_params *scan_params;
 943         enum wpa_states prev_state;
 944         struct wpa_ssid *ssid = NULL;
 945         struct wpabuf *extra_ie = NULL;
 946         int ret;
 947         unsigned int max_sched_scan_ssids;
 948         int wildcard = 0;
 949         int need_ssids;
 950
 951         if (!wpa_s->sched_scan_supported)
 952                 return -1;
 953
 954         if (wpa_s->max_sched_scan_ssids > WPAS_MAX_SCAN_SSIDS)
 955                 max_sched_scan_ssids = WPAS_MAX_SCAN_SSIDS;
 956         else
 957                 max_sched_scan_ssids = wpa_s->max_sched_scan_ssids;
 958         if (max_sched_scan_ssids < 1 || wpa_s->conf->disable_scan_offload)
 959                 return -1;
 960
 961         if (wpa_s->sched_scanning) {
 962                 wpa_dbg(wpa_s, MSG_DEBUG, "Already sched scanning");
 963                 return 0;
 964         }
 965
 966         need_ssids = 0;
 967         for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
 968                 if (!wpas_network_disabled(wpa_s, ssid) && !ssid->scan_ssid) {
 969                         /* Use wildcard SSID to find this network */
 970                         wildcard = 1;
 971                 } else if (!wpas_network_disabled(wpa_s, ssid) &&
 972                            ssid->ssid_len)
 973                         need_ssids++;
 974
 975 #ifdef CONFIG_WPS
 976                 if (!wpas_network_disabled(wpa_s, ssid) &&
 977                     ssid->key_mgmt == WPA_KEY_MGMT_WPS) {
 978                         /*
 979                          * Normal scan is more reliable and faster for WPS
 980                          * operations and since these are for short periods of
 981                          * time, the benefit of trying to use sched_scan would
 982                          * be limited.
 983                          */
 984                         wpa_dbg(wpa_s, MSG_DEBUG, "Use normal scan instead of "
 985                                 "sched_scan for WPS");
 986                         return -1;
 987                 }
 988 #endif /* CONFIG_WPS */
 989         }
 990         if (wildcard)
 991                 need_ssids++;
 992
 993         if (wpa_s->normal_scans < 3 &&
 994             (need_ssids <= wpa_s->max_scan_ssids ||
 995              wpa_s->max_scan_ssids >= (int) max_sched_scan_ssids)) {
 996                 /*
 997                  * When normal scan can speed up operations, use that for the
 998                  * first operations before starting the sched_scan to allow
 999                  * user space sleep more. We do this only if the normal scan
1000                  * has functionality that is suitable for this or if the
1001                  * sched_scan does not have better support for multiple SSIDs.
1002                  */
1003                 wpa_dbg(wpa_s, MSG_DEBUG, "Use normal scan instead of "
1004                         "sched_scan for initial scans (normal_scans=%d)",
1005                         wpa_s->normal_scans);
1006                 return -1;
1007         }
1008
1009         os_memset(&params, 0, sizeof(params));
1010
1011         /* If we can't allocate space for the filters, we just don't filter */
1012         params.filter_ssids = os_zalloc(wpa_s->max_match_sets *
1013                                         sizeof(struct wpa_driver_scan_filter));
1014
1015         prev_state = wpa_s->wpa_state;
1016         if (wpa_s->wpa_state == WPA_DISCONNECTED ||
1017             wpa_s->wpa_state == WPA_INACTIVE)
1018                 wpa_supplicant_set_state(wpa_s, WPA_SCANNING);
1019
1020         if (wpa_s->autoscan_params != NULL) {
1021                 scan_params = wpa_s->autoscan_params;
1022                 goto scan;
1023         }
1024
1025         /* Find the starting point from which to continue scanning */
1026         ssid = wpa_s->conf->ssid;
1027         if (wpa_s->prev_sched_ssid) {
1028                 while (ssid) {
1029                         if (ssid == wpa_s->prev_sched_ssid) {
1030                                 ssid = ssid->next;
1031                                 break;
1032                         }
1033                         ssid = ssid->next;
1034                 }
1035         }
1036
1037         if (!ssid || !wpa_s->prev_sched_ssid) {
1038                 wpa_dbg(wpa_s, MSG_DEBUG, "Beginning of SSID list");
1039                 if (wpa_s->conf->sched_scan_interval)
1040                         wpa_s->sched_scan_interval =
1041                                 wpa_s->conf->sched_scan_interval;
1042                 if (wpa_s->sched_scan_interval == 0)
1043                         wpa_s->sched_scan_interval = 10;
1044                 wpa_s->sched_scan_timeout = max_sched_scan_ssids * 2;
1045                 wpa_s->first_sched_scan = 1;
1046                 ssid = wpa_s->conf->ssid;
1047                 wpa_s->prev_sched_ssid = ssid;
1048         }
1049
1050         if (wildcard) {
1051                 wpa_dbg(wpa_s, MSG_DEBUG, "Add wildcard SSID to sched_scan");
1052                 params.num_ssids++;
1053         }
1054
1055         while (ssid) {
1056                 if (wpas_network_disabled(wpa_s, ssid))
1057                         goto next;
1058
1059                 if (params.num_filter_ssids < wpa_s->max_match_sets &&
1060                     params.filter_ssids && ssid->ssid && ssid->ssid_len) {
1061                         wpa_dbg(wpa_s, MSG_DEBUG, "add to filter ssid: %s",
1062                                 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
1063                         os_memcpy(params.filter_ssids[params.num_filter_ssids].ssid,
1064                                   ssid->ssid, ssid->ssid_len);
1065                         params.filter_ssids[params.num_filter_ssids].ssid_len =
1066                                 ssid->ssid_len;
1067                         params.num_filter_ssids++;
1068                 } else if (params.filter_ssids && ssid->ssid && ssid->ssid_len)
1069                 {
1070                         wpa_dbg(wpa_s, MSG_DEBUG, "Not enough room for SSID "
1071                                 "filter for sched_scan - drop filter");
1072                         os_free(params.filter_ssids);
1073                         params.filter_ssids = NULL;
1074                         params.num_filter_ssids = 0;
1075                 }
1076
1077                 if (ssid->scan_ssid && ssid->ssid && ssid->ssid_len) {
1078                         if (params.num_ssids == max_sched_scan_ssids)
1079                                 break; /* only room for broadcast SSID */
1080                         wpa_dbg(wpa_s, MSG_DEBUG,
1081                                 "add to active scan ssid: %s",
1082                                 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
1083                         params.ssids[params.num_ssids].ssid =
1084                                 ssid->ssid;
1085                         params.ssids[params.num_ssids].ssid_len =
1086                                 ssid->ssid_len;
1087                         params.num_ssids++;
1088                         if (params.num_ssids >= max_sched_scan_ssids) {
1089                                 wpa_s->prev_sched_ssid = ssid;
1090                                 do {
1091                                         ssid = ssid->next;
1092                                 } while (ssid &&
1093                                          (wpas_network_disabled(wpa_s, ssid) ||
1094                                           !ssid->scan_ssid));
1095                                 break;
1096                         }
1097                 }
1098
1099         next:
1100                 wpa_s->prev_sched_ssid = ssid;
1101                 ssid = ssid->next;
1102         }
1103
1104         if (params.num_filter_ssids == 0) {
1105                 os_free(params.filter_ssids);
1106                 params.filter_ssids = NULL;
1107         }
1108
1109         extra_ie = wpa_supplicant_extra_ies(wpa_s);
1110         if (extra_ie) {
1111                 params.extra_ies = wpabuf_head(extra_ie);
1112                 params.extra_ies_len = wpabuf_len(extra_ie);
1113         }
1114
1115         scan_params = &params;
1116
1117 scan:
1118         if (ssid || !wpa_s->first_sched_scan) {
1119                 wpa_dbg(wpa_s, MSG_DEBUG,
1120                         "Starting sched scan: interval %d timeout %d",
1121                         wpa_s->sched_scan_interval, wpa_s->sched_scan_timeout);
1122         } else {
1123                 wpa_dbg(wpa_s, MSG_DEBUG,
1124                         "Starting sched scan: interval %d (no timeout)",
1125                         wpa_s->sched_scan_interval);
1126         }
1127
1128         wpa_setband_scan_freqs(wpa_s, scan_params);
1129
1130         ret = wpa_supplicant_start_sched_scan(wpa_s, scan_params,
1131                                               wpa_s->sched_scan_interval);
1132         wpabuf_free(extra_ie);
1133         os_free(params.filter_ssids);
1134         if (ret) {
1135                 wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate sched scan");
1136                 if (prev_state != wpa_s->wpa_state)
1137                         wpa_supplicant_set_state(wpa_s, prev_state);
1138                 return ret;
1139         }
1140
1141         /* If we have more SSIDs to scan, add a timeout so we scan them too */
1142         if (ssid || !wpa_s->first_sched_scan) {
1143                 wpa_s->sched_scan_timed_out = 0;
1144                 eloop_register_timeout(wpa_s->sched_scan_timeout, 0,
1145                                        wpa_supplicant_sched_scan_timeout,
1146                                        wpa_s, NULL);
1147                 wpa_s->first_sched_scan = 0;
1148                 wpa_s->sched_scan_timeout /= 2;
1149                 wpa_s->sched_scan_interval *= 2;
1150                 if (wpa_s->sched_scan_timeout < wpa_s->sched_scan_interval) {
1151                         wpa_s->sched_scan_interval = 10;
1152                         wpa_s->sched_scan_timeout = max_sched_scan_ssids * 2;
1153                 }
1154         }
1155
1156         /* If there is no more ssids, start next time from the beginning */
1157         if (!ssid)
1158                 wpa_s->prev_sched_ssid = NULL;
1159
1160         return 0;
1161 }
1162
1163
1164 /**
1165  * wpa_supplicant_cancel_scan - Cancel a scheduled scan request
1166  * @wpa_s: Pointer to wpa_supplicant data
1167  *
1168  * This function is used to cancel a scan request scheduled with
1169  * wpa_supplicant_req_scan().
1170  */
1171 void wpa_supplicant_cancel_scan(struct wpa_supplicant *wpa_s)
1172 {
1173         wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling scan request");
1174         eloop_cancel_timeout(wpa_supplicant_scan, wpa_s, NULL);
1175 }
1176
1177
1178 /**
1179  * wpa_supplicant_cancel_delayed_sched_scan - Stop a delayed scheduled scan
1180  * @wpa_s: Pointer to wpa_supplicant data
1181  *
1182  * This function is used to stop a delayed scheduled scan.
1183  */
1184 void wpa_supplicant_cancel_delayed_sched_scan(struct wpa_supplicant *wpa_s)
1185 {
1186         if (!wpa_s->sched_scan_supported)
1187                 return;
1188
1189         wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling delayed sched scan");
1190         eloop_cancel_timeout(wpa_supplicant_delayed_sched_scan_timeout,
1191                              wpa_s, NULL);
1192 }
1193
1194
1195 /**
1196  * wpa_supplicant_cancel_sched_scan - Stop running scheduled scans
1197  * @wpa_s: Pointer to wpa_supplicant data
1198  *
1199  * This function is used to stop a periodic scheduled scan.
1200  */
1201 void wpa_supplicant_cancel_sched_scan(struct wpa_supplicant *wpa_s)
1202 {
1203         if (!wpa_s->sched_scanning)
1204                 return;
1205
1206         wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling sched scan");
1207         eloop_cancel_timeout(wpa_supplicant_sched_scan_timeout, wpa_s, NULL);
1208         wpa_supplicant_stop_sched_scan(wpa_s);
1209 }
1210
1211
1212 /**
1213  * wpa_supplicant_notify_scanning - Indicate possible scan state change
1214  * @wpa_s: Pointer to wpa_supplicant data
1215  * @scanning: Whether scanning is currently in progress
1216  *
1217  * This function is to generate scanning notifycations. It is called whenever
1218  * there may have been a change in scanning (scan started, completed, stopped).
1219  * wpas_notify_scanning() is called whenever the scanning state changed from the
1220  * previously notified state.
1221  */
1222 void wpa_supplicant_notify_scanning(struct wpa_supplicant *wpa_s,
1223                                     int scanning)
1224 {
1225         if (wpa_s->scanning != scanning) {
1226                 wpa_s->scanning = scanning;
1227                 wpas_notify_scanning(wpa_s);
1228         }
1229 }
1230
1231
1232 static int wpa_scan_get_max_rate(const struct wpa_scan_res *res)
1233 {
1234         int rate = 0;
1235         const u8 *ie;
1236         int i;
1237
1238         ie = wpa_scan_get_ie(res, WLAN_EID_SUPP_RATES);
1239         for (i = 0; ie && i < ie[1]; i++) {
1240                 if ((ie[i + 2] & 0x7f) > rate)
1241                         rate = ie[i + 2] & 0x7f;
1242         }
1243
1244         ie = wpa_scan_get_ie(res, WLAN_EID_EXT_SUPP_RATES);
1245         for (i = 0; ie && i < ie[1]; i++) {
1246                 if ((ie[i + 2] & 0x7f) > rate)
1247                         rate = ie[i + 2] & 0x7f;
1248         }
1249
1250         return rate;
1251 }
1252
1253
1254 /**
1255  * wpa_scan_get_ie - Fetch a specified information element from a scan result
1256  * @res: Scan result entry
1257  * @ie: Information element identitifier (WLAN_EID_*)
1258  * Returns: Pointer to the information element (id field) or %NULL if not found
1259  *
1260  * This function returns the first matching information element in the scan
1261  * result.
1262  */
1263 const u8 * wpa_scan_get_ie(const struct wpa_scan_res *res, u8 ie)
1264 {
1265         const u8 *end, *pos;
1266
1267         pos = (const u8 *) (res + 1);
1268         end = pos + res->ie_len;
1269
1270         while (pos + 1 < end) {
1271                 if (pos + 2 + pos[1] > end)
1272                         break;
1273                 if (pos[0] == ie)
1274                         return pos;
1275                 pos += 2 + pos[1];
1276         }
1277
1278         return NULL;
1279 }
1280
1281
1282 /**
1283  * wpa_scan_get_vendor_ie - Fetch vendor information element from a scan result
1284  * @res: Scan result entry
1285  * @vendor_type: Vendor type (four octets starting the IE payload)
1286  * Returns: Pointer to the information element (id field) or %NULL if not found
1287  *
1288  * This function returns the first matching information element in the scan
1289  * result.
1290  */
1291 const u8 * wpa_scan_get_vendor_ie(const struct wpa_scan_res *res,
1292                                   u32 vendor_type)
1293 {
1294         const u8 *end, *pos;
1295
1296         pos = (const u8 *) (res + 1);
1297         end = pos + res->ie_len;
1298
1299         while (pos + 1 < end) {
1300                 if (pos + 2 + pos[1] > end)
1301                         break;
1302                 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1303                     vendor_type == WPA_GET_BE32(&pos[2]))
1304                         return pos;
1305                 pos += 2 + pos[1];
1306         }
1307
1308         return NULL;
1309 }
1310
1311
1312 /**
1313  * wpa_scan_get_vendor_ie_beacon - Fetch vendor information from a scan result
1314  * @res: Scan result entry
1315  * @vendor_type: Vendor type (four octets starting the IE payload)
1316  * Returns: Pointer to the information element (id field) or %NULL if not found
1317  *
1318  * This function returns the first matching information element in the scan
1319  * result.
1320  *
1321  * This function is like wpa_scan_get_vendor_ie(), but uses IE buffer only
1322  * from Beacon frames instead of either Beacon or Probe Response frames.
1323  */
1324 const u8 * wpa_scan_get_vendor_ie_beacon(const struct wpa_scan_res *res,
1325                                          u32 vendor_type)
1326 {
1327         const u8 *end, *pos;
1328
1329         if (res->beacon_ie_len == 0)
1330                 return NULL;
1331
1332         pos = (const u8 *) (res + 1);
1333         pos += res->ie_len;
1334         end = pos + res->beacon_ie_len;
1335
1336         while (pos + 1 < end) {
1337                 if (pos + 2 + pos[1] > end)
1338                         break;
1339                 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1340                     vendor_type == WPA_GET_BE32(&pos[2]))
1341                         return pos;
1342                 pos += 2 + pos[1];
1343         }
1344
1345         return NULL;
1346 }
1347
1348
1349 /**
1350  * wpa_scan_get_vendor_ie_multi - Fetch vendor IE data from a scan result
1351  * @res: Scan result entry
1352  * @vendor_type: Vendor type (four octets starting the IE payload)
1353  * Returns: Pointer to the information element payload or %NULL if not found
1354  *
1355  * This function returns concatenated payload of possibly fragmented vendor
1356  * specific information elements in the scan result. The caller is responsible
1357  * for freeing the returned buffer.
1358  */
1359 struct wpabuf * wpa_scan_get_vendor_ie_multi(const struct wpa_scan_res *res,
1360                                              u32 vendor_type)
1361 {
1362         struct wpabuf *buf;
1363         const u8 *end, *pos;
1364
1365         buf = wpabuf_alloc(res->ie_len);
1366         if (buf == NULL)
1367                 return NULL;
1368
1369         pos = (const u8 *) (res + 1);
1370         end = pos + res->ie_len;
1371
1372         while (pos + 1 < end) {
1373                 if (pos + 2 + pos[1] > end)
1374                         break;
1375                 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1376                     vendor_type == WPA_GET_BE32(&pos[2]))
1377                         wpabuf_put_data(buf, pos + 2 + 4, pos[1] - 4);
1378                 pos += 2 + pos[1];
1379         }
1380
1381         if (wpabuf_len(buf) == 0) {
1382                 wpabuf_free(buf);
1383                 buf = NULL;
1384         }
1385
1386         return buf;
1387 }
1388
1389
1390 /*
1391  * Channels with a great SNR can operate at full rate. What is a great SNR?
1392  * This doc https://supportforums.cisco.com/docs/DOC-12954 says, "the general
1393  * rule of thumb is that any SNR above 20 is good." This one
1394  * http://www.cisco.com/en/US/tech/tk722/tk809/technologies_q_and_a_item09186a00805e9a96.shtml#qa23
1395  * recommends 25 as a minimum SNR for 54 Mbps data rate. 30 is chosen here as a
1396  * conservative value.
1397  */
1398 #define GREAT_SNR 30
1399
1400 /* Compare function for sorting scan results. Return >0 if @b is considered
1401  * better. */
1402 static int wpa_scan_result_compar(const void *a, const void *b)
1403 {
1404 #define IS_5GHZ(n) (n > 4000)
1405 #define MIN(a,b) a < b ? a : b
1406         struct wpa_scan_res **_wa = (void *) a;
1407         struct wpa_scan_res **_wb = (void *) b;
1408         struct wpa_scan_res *wa = *_wa;
1409         struct wpa_scan_res *wb = *_wb;
1410         int wpa_a, wpa_b, maxrate_a, maxrate_b;
1411         int snr_a, snr_b;
1412
1413         /* WPA/WPA2 support preferred */
1414         wpa_a = wpa_scan_get_vendor_ie(wa, WPA_IE_VENDOR_TYPE) != NULL ||
1415                 wpa_scan_get_ie(wa, WLAN_EID_RSN) != NULL;
1416         wpa_b = wpa_scan_get_vendor_ie(wb, WPA_IE_VENDOR_TYPE) != NULL ||
1417                 wpa_scan_get_ie(wb, WLAN_EID_RSN) != NULL;
1418
1419         if (wpa_b && !wpa_a)
1420                 return 1;
1421         if (!wpa_b && wpa_a)
1422                 return -1;
1423
1424         /* privacy support preferred */
1425         if ((wa->caps & IEEE80211_CAP_PRIVACY) == 0 &&
1426             (wb->caps & IEEE80211_CAP_PRIVACY))
1427                 return 1;
1428         if ((wa->caps & IEEE80211_CAP_PRIVACY) &&
1429             (wb->caps & IEEE80211_CAP_PRIVACY) == 0)
1430                 return -1;
1431
1432         if ((wa->flags & wb->flags & WPA_SCAN_LEVEL_DBM) &&
1433             !((wa->flags | wb->flags) & WPA_SCAN_NOISE_INVALID)) {
1434                 snr_a = MIN(wa->level - wa->noise, GREAT_SNR);
1435                 snr_b = MIN(wb->level - wb->noise, GREAT_SNR);
1436         } else {
1437                 /* Not suitable information to calculate SNR, so use level */
1438                 snr_a = wa->level;
1439                 snr_b = wb->level;
1440         }
1441
1442         /* best/max rate preferred if SNR close enough */
1443         if ((snr_a && snr_b && abs(snr_b - snr_a) < 5) ||
1444             (wa->qual && wb->qual && abs(wb->qual - wa->qual) < 10)) {
1445                 maxrate_a = wpa_scan_get_max_rate(wa);
1446                 maxrate_b = wpa_scan_get_max_rate(wb);
1447                 if (maxrate_a != maxrate_b)
1448                         return maxrate_b - maxrate_a;
1449                 if (IS_5GHZ(wa->freq) ^ IS_5GHZ(wb->freq))
1450                         return IS_5GHZ(wa->freq) ? -1 : 1;
1451         }
1452
1453         /* use freq for channel preference */
1454
1455         /* all things being equal, use SNR; if SNRs are
1456          * identical, use quality values since some drivers may only report
1457          * that value and leave the signal level zero */
1458         if (snr_b == snr_a)
1459                 return wb->qual - wa->qual;
1460         return snr_b - snr_a;
1461 #undef MIN
1462 #undef IS_5GHZ
1463 }
1464
1465
1466 #ifdef CONFIG_WPS
1467 /* Compare function for sorting scan results when searching a WPS AP for
1468  * provisioning. Return >0 if @b is considered better. */
1469 static int wpa_scan_result_wps_compar(const void *a, const void *b)
1470 {
1471         struct wpa_scan_res **_wa = (void *) a;
1472         struct wpa_scan_res **_wb = (void *) b;
1473         struct wpa_scan_res *wa = *_wa;
1474         struct wpa_scan_res *wb = *_wb;
1475         int uses_wps_a, uses_wps_b;
1476         struct wpabuf *wps_a, *wps_b;
1477         int res;
1478
1479         /* Optimization - check WPS IE existence before allocated memory and
1480          * doing full reassembly. */
1481         uses_wps_a = wpa_scan_get_vendor_ie(wa, WPS_IE_VENDOR_TYPE) != NULL;
1482         uses_wps_b = wpa_scan_get_vendor_ie(wb, WPS_IE_VENDOR_TYPE) != NULL;
1483         if (uses_wps_a && !uses_wps_b)
1484                 return -1;
1485         if (!uses_wps_a && uses_wps_b)
1486                 return 1;
1487
1488         if (uses_wps_a && uses_wps_b) {
1489                 wps_a = wpa_scan_get_vendor_ie_multi(wa, WPS_IE_VENDOR_TYPE);
1490                 wps_b = wpa_scan_get_vendor_ie_multi(wb, WPS_IE_VENDOR_TYPE);
1491                 res = wps_ap_priority_compar(wps_a, wps_b);
1492                 wpabuf_free(wps_a);
1493                 wpabuf_free(wps_b);
1494                 if (res)
1495                         return res;
1496         }
1497
1498         /*
1499          * Do not use current AP security policy as a sorting criteria during
1500          * WPS provisioning step since the AP may get reconfigured at the
1501          * completion of provisioning.
1502          */
1503
1504         /* all things being equal, use signal level; if signal levels are
1505          * identical, use quality values since some drivers may only report
1506          * that value and leave the signal level zero */
1507         if (wb->level == wa->level)
1508                 return wb->qual - wa->qual;
1509         return wb->level - wa->level;
1510 }
1511 #endif /* CONFIG_WPS */
1512
1513
1514 static void dump_scan_res(struct wpa_scan_results *scan_res)
1515 {
1516 #ifndef CONFIG_NO_STDOUT_DEBUG
1517         size_t i;
1518
1519         if (scan_res->res == NULL || scan_res->num == 0)
1520                 return;
1521
1522         wpa_printf(MSG_EXCESSIVE, "Sorted scan results");
1523
1524         for (i = 0; i < scan_res->num; i++) {
1525                 struct wpa_scan_res *r = scan_res->res[i];
1526                 u8 *pos;
1527                 if ((r->flags & (WPA_SCAN_LEVEL_DBM | WPA_SCAN_NOISE_INVALID))
1528                     == WPA_SCAN_LEVEL_DBM) {
1529                         int snr = r->level - r->noise;
1530                         wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d "
1531                                    "noise=%d level=%d snr=%d%s flags=0x%x "
1532                                    "age=%u",
1533                                    MAC2STR(r->bssid), r->freq, r->qual,
1534                                    r->noise, r->level, snr,
1535                                    snr >= GREAT_SNR ? "*" : "", r->flags,
1536                                    r->age);
1537                 } else {
1538                         wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d "
1539                                    "noise=%d level=%d flags=0x%x age=%u",
1540                                    MAC2STR(r->bssid), r->freq, r->qual,
1541                                    r->noise, r->level, r->flags, r->age);
1542                 }
1543                 pos = (u8 *) (r + 1);
1544                 if (r->ie_len)
1545                         wpa_hexdump(MSG_EXCESSIVE, "IEs", pos, r->ie_len);
1546                 pos += r->ie_len;
1547                 if (r->beacon_ie_len)
1548                         wpa_hexdump(MSG_EXCESSIVE, "Beacon IEs",
1549                                     pos, r->beacon_ie_len);
1550         }
1551 #endif /* CONFIG_NO_STDOUT_DEBUG */
1552 }
1553
1554
1555 /**
1556  * wpa_supplicant_filter_bssid_match - Is the specified BSSID allowed
1557  * @wpa_s: Pointer to wpa_supplicant data
1558  * @bssid: BSSID to check
1559  * Returns: 0 if the BSSID is filtered or 1 if not
1560  *
1561  * This function is used to filter out specific BSSIDs from scan reslts mainly
1562  * for testing purposes (SET bssid_filter ctrl_iface command).
1563  */
1564 int wpa_supplicant_filter_bssid_match(struct wpa_supplicant *wpa_s,
1565                                       const u8 *bssid)
1566 {
1567         size_t i;
1568
1569         if (wpa_s->bssid_filter == NULL)
1570                 return 1;
1571
1572         for (i = 0; i < wpa_s->bssid_filter_count; i++) {
1573                 if (os_memcmp(wpa_s->bssid_filter + i * ETH_ALEN, bssid,
1574                               ETH_ALEN) == 0)
1575                         return 1;
1576         }
1577
1578         return 0;
1579 }
1580
1581
1582 static void filter_scan_res(struct wpa_supplicant *wpa_s,
1583                             struct wpa_scan_results *res)
1584 {
1585         size_t i, j;
1586
1587         if (wpa_s->bssid_filter == NULL)
1588                 return;
1589
1590         for (i = 0, j = 0; i < res->num; i++) {
1591                 if (wpa_supplicant_filter_bssid_match(wpa_s,
1592                                                       res->res[i]->bssid)) {
1593                         res->res[j++] = res->res[i];
1594                 } else {
1595                         os_free(res->res[i]);
1596                         res->res[i] = NULL;
1597                 }
1598         }
1599
1600         if (res->num != j) {
1601                 wpa_printf(MSG_DEBUG, "Filtered out %d scan results",
1602                            (int) (res->num - j));
1603                 res->num = j;
1604         }
1605 }
1606
1607
1608 /**
1609  * wpa_supplicant_get_scan_results - Get scan results
1610  * @wpa_s: Pointer to wpa_supplicant data
1611  * @info: Information about what was scanned or %NULL if not available
1612  * @new_scan: Whether a new scan was performed
1613  * Returns: Scan results, %NULL on failure
1614  *
1615  * This function request the current scan results from the driver and updates
1616  * the local BSS list wpa_s->bss. The caller is responsible for freeing the
1617  * results with wpa_scan_results_free().
1618  */
1619 struct wpa_scan_results *
1620 wpa_supplicant_get_scan_results(struct wpa_supplicant *wpa_s,
1621                                 struct scan_info *info, int new_scan)
1622 {
1623         struct wpa_scan_results *scan_res;
1624         size_t i;
1625         int (*compar)(const void *, const void *) = wpa_scan_result_compar;
1626
1627         scan_res = wpa_drv_get_scan_results2(wpa_s);
1628         if (scan_res == NULL) {
1629                 wpa_dbg(wpa_s, MSG_DEBUG, "Failed to get scan results");
1630                 return NULL;
1631         }
1632         if (scan_res->fetch_time.sec == 0) {
1633                 /*
1634                  * Make sure we have a valid timestamp if the driver wrapper
1635                  * does not set this.
1636                  */
1637                 os_get_reltime(&scan_res->fetch_time);
1638         }
1639         filter_scan_res(wpa_s, scan_res);
1640
1641 #ifdef CONFIG_WPS
1642         if (wpas_wps_searching(wpa_s)) {
1643                 wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Order scan results with WPS "
1644                         "provisioning rules");
1645                 compar = wpa_scan_result_wps_compar;
1646         }
1647 #endif /* CONFIG_WPS */
1648
1649         qsort(scan_res->res, scan_res->num, sizeof(struct wpa_scan_res *),
1650               compar);
1651         dump_scan_res(scan_res);
1652
1653         wpa_bss_update_start(wpa_s);
1654         for (i = 0; i < scan_res->num; i++)
1655                 wpa_bss_update_scan_res(wpa_s, scan_res->res[i],
1656                                         &scan_res->fetch_time);
1657         wpa_bss_update_end(wpa_s, info, new_scan);
1658
1659         return scan_res;
1660 }
1661
1662
1663 /**
1664  * wpa_supplicant_update_scan_results - Update scan results from the driver
1665  * @wpa_s: Pointer to wpa_supplicant data
1666  * Returns: 0 on success, -1 on failure
1667  *
1668  * This function updates the BSS table within wpa_supplicant based on the
1669  * currently available scan results from the driver without requesting a new
1670  * scan. This is used in cases where the driver indicates an association
1671  * (including roaming within ESS) and wpa_supplicant does not yet have the
1672  * needed information to complete the connection (e.g., to perform validation
1673  * steps in 4-way handshake).
1674  */
1675 int wpa_supplicant_update_scan_results(struct wpa_supplicant *wpa_s)
1676 {
1677         struct wpa_scan_results *scan_res;
1678         scan_res = wpa_supplicant_get_scan_results(wpa_s, NULL, 0);
1679         if (scan_res == NULL)
1680                 return -1;
1681         wpa_scan_results_free(scan_res);
1682
1683         return 0;
1684 }
1685
1686
1687 /**
1688  * scan_only_handler - Reports scan results
1689  */
1690 void scan_only_handler(struct wpa_supplicant *wpa_s,
1691                        struct wpa_scan_results *scan_res)
1692 {
1693         wpa_dbg(wpa_s, MSG_DEBUG, "Scan-only results received");
1694         if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
1695             wpa_s->manual_scan_use_id && wpa_s->own_scan_running) {
1696                 wpa_msg_ctrl(wpa_s, MSG_INFO, WPA_EVENT_SCAN_RESULTS "id=%u",
1697                              wpa_s->manual_scan_id);
1698                 wpa_s->manual_scan_use_id = 0;
1699         } else {
1700                 wpa_msg_ctrl(wpa_s, MSG_INFO, WPA_EVENT_SCAN_RESULTS);
1701         }
1702         wpas_notify_scan_results(wpa_s);
1703         wpas_notify_scan_done(wpa_s, 1);
1704         if (wpa_s->scan_work) {
1705                 struct wpa_radio_work *work = wpa_s->scan_work;
1706                 wpa_s->scan_work = NULL;
1707                 radio_work_done(work);
1708         }
1709 }
1710
1711
1712 int wpas_scan_scheduled(struct wpa_supplicant *wpa_s)
1713 {
1714         return eloop_is_timeout_registered(wpa_supplicant_scan, wpa_s, NULL);
1715 }
1716
1717
1718 struct wpa_driver_scan_params *
1719 wpa_scan_clone_params(const struct wpa_driver_scan_params *src)
1720 {
1721         struct wpa_driver_scan_params *params;
1722         size_t i;
1723         u8 *n;
1724
1725         params = os_zalloc(sizeof(*params));
1726         if (params == NULL)
1727                 return NULL;
1728
1729         for (i = 0; i < src->num_ssids; i++) {
1730                 if (src->ssids[i].ssid) {
1731                         n = os_malloc(src->ssids[i].ssid_len);
1732                         if (n == NULL)
1733                                 goto failed;
1734                         os_memcpy(n, src->ssids[i].ssid,
1735                                   src->ssids[i].ssid_len);
1736                         params->ssids[i].ssid = n;
1737                         params->ssids[i].ssid_len = src->ssids[i].ssid_len;
1738                 }
1739         }
1740         params->num_ssids = src->num_ssids;
1741
1742         if (src->extra_ies) {
1743                 n = os_malloc(src->extra_ies_len);
1744                 if (n == NULL)
1745                         goto failed;
1746                 os_memcpy(n, src->extra_ies, src->extra_ies_len);
1747                 params->extra_ies = n;
1748                 params->extra_ies_len = src->extra_ies_len;
1749         }
1750
1751         if (src->freqs) {
1752                 int len = int_array_len(src->freqs);
1753                 params->freqs = os_malloc((len + 1) * sizeof(int));
1754                 if (params->freqs == NULL)
1755                         goto failed;
1756                 os_memcpy(params->freqs, src->freqs, (len + 1) * sizeof(int));
1757         }
1758
1759         if (src->filter_ssids) {
1760                 params->filter_ssids = os_malloc(sizeof(params->filter_ssids) *
1761                                                  src->num_filter_ssids);
1762                 if (params->filter_ssids == NULL)
1763                         goto failed;
1764                 os_memcpy(params->filter_ssids, src->filter_ssids,
1765                           sizeof(params->filter_ssids) * src->num_filter_ssids);
1766                 params->num_filter_ssids = src->num_filter_ssids;
1767         }
1768
1769         params->filter_rssi = src->filter_rssi;
1770         params->p2p_probe = src->p2p_probe;
1771         params->only_new_results = src->only_new_results;
1772
1773         return params;
1774
1775 failed:
1776         wpa_scan_free_params(params);
1777         return NULL;
1778 }
1779
1780
1781 void wpa_scan_free_params(struct wpa_driver_scan_params *params)
1782 {
1783         size_t i;
1784
1785         if (params == NULL)
1786                 return;
1787
1788         for (i = 0; i < params->num_ssids; i++)
1789                 os_free((u8 *) params->ssids[i].ssid);
1790         os_free((u8 *) params->extra_ies);
1791         os_free(params->freqs);
1792         os_free(params->filter_ssids);
1793         os_free(params);
1794 }