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 "gas_query.h"
  25 #include "scan.h"
  26
  27
  28 static void wpa_supplicant_gen_assoc_event(struct wpa_supplicant *wpa_s)
  29 {
  30         struct wpa_ssid *ssid;
  31         union wpa_event_data data;
  32
  33         ssid = wpa_supplicant_get_ssid(wpa_s);
  34         if (ssid == NULL)
  35                 return;
  36
  37         if (wpa_s->current_ssid == NULL) {
  38                 wpa_s->current_ssid = ssid;
  39                 if (wpa_s->current_ssid != NULL)
  40                         wpas_notify_network_changed(wpa_s);
  41         }
  42         wpa_supplicant_initiate_eapol(wpa_s);
  43         wpa_dbg(wpa_s, MSG_DEBUG, "Already associated with a configured "
  44                 "network - generating associated event");
  45         os_memset(&data, 0, sizeof(data));
  46         wpa_supplicant_event(wpa_s, EVENT_ASSOC, &data);
  47 }
  48
  49
  50 #ifdef CONFIG_WPS
  51 static int wpas_wps_in_use(struct wpa_supplicant *wpa_s,
  52                            enum wps_request_type *req_type)
  53 {
  54         struct wpa_ssid *ssid;
  55         int wps = 0;
  56
  57         for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
  58                 if (!(ssid->key_mgmt & WPA_KEY_MGMT_WPS))
  59                         continue;
  60
  61                 wps = 1;
  62                 *req_type = wpas_wps_get_req_type(ssid);
  63                 if (!ssid->eap.phase1)
  64                         continue;
  65
  66                 if (os_strstr(ssid->eap.phase1, "pbc=1"))
  67                         return 2;
  68         }
  69
  70 #ifdef CONFIG_P2P
  71         if (!wpa_s->global->p2p_disabled && wpa_s->global->p2p &&
  72             !wpa_s->conf->p2p_disabled) {
  73                 wpa_s->wps->dev.p2p = 1;
  74                 if (!wps) {
  75                         wps = 1;
  76                         *req_type = WPS_REQ_ENROLLEE_INFO;
  77                 }
  78         }
  79 #endif /* CONFIG_P2P */
  80
  81         return wps;
  82 }
  83 #endif /* CONFIG_WPS */
  84
  85
  86 /**
  87  * wpa_supplicant_enabled_networks - Check whether there are enabled networks
  88  * @wpa_s: Pointer to wpa_supplicant data
  89  * Returns: 0 if no networks are enabled, >0 if networks are enabled
  90  *
  91  * This function is used to figure out whether any networks (or Interworking
  92  * with enabled credentials and auto_interworking) are present in the current
  93  * configuration.
  94  */
  95 int wpa_supplicant_enabled_networks(struct wpa_supplicant *wpa_s)
  96 {
  97         struct wpa_ssid *ssid = wpa_s->conf->ssid;
  98         int count = 0, disabled = 0;
  99         while (ssid) {
 100                 if (!wpas_network_disabled(wpa_s, ssid))
 101                         count++;
 102                 else
 103                         disabled++;
 104                 ssid = ssid->next;
 105         }
 106         if (wpa_s->conf->cred && wpa_s->conf->interworking &&
 107             wpa_s->conf->auto_interworking)
 108                 count++;
 109         if (count == 0 && disabled > 0) {
 110                 wpa_dbg(wpa_s, MSG_DEBUG, "No enabled networks (%d disabled "
 111                         "networks)", disabled);
 112         }
 113         return count;
 114 }
 115
 116
 117 static void wpa_supplicant_assoc_try(struct wpa_supplicant *wpa_s,
 118                                      struct wpa_ssid *ssid)
 119 {
 120         while (ssid) {
 121                 if (!wpas_network_disabled(wpa_s, ssid))
 122                         break;
 123                 ssid = ssid->next;
 124         }
 125
 126         /* ap_scan=2 mode - try to associate with each SSID. */
 127         if (ssid == NULL) {
 128                 wpa_dbg(wpa_s, MSG_DEBUG, "wpa_supplicant_assoc_try: Reached "
 129                         "end of scan list - go back to beginning");
 130                 wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
 131                 wpa_supplicant_req_scan(wpa_s, 0, 0);
 132                 return;
 133         }
 134         if (ssid->next) {
 135                 /* Continue from the next SSID on the next attempt. */
 136                 wpa_s->prev_scan_ssid = ssid;
 137         } else {
 138                 /* Start from the beginning of the SSID list. */
 139                 wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
 140         }
 141         wpa_supplicant_associate(wpa_s, NULL, ssid);
 142 }
 143
 144
 145 static void wpas_trigger_scan_cb(struct wpa_radio_work *work, int deinit)
 146 {
 147         struct wpa_supplicant *wpa_s = work->wpa_s;
 148         struct wpa_driver_scan_params *params = work->ctx;
 149         int ret;
 150
 151         if (deinit) {
 152                 wpa_scan_free_params(params);
 153                 return;
 154         }
 155
 156         wpa_supplicant_notify_scanning(wpa_s, 1);
 157
 158         if (wpa_s->clear_driver_scan_cache)
 159                 params->only_new_results = 1;
 160         ret = wpa_drv_scan(wpa_s, params);
 161         wpa_scan_free_params(params);
 162         work->ctx = NULL;
 163         if (ret) {
 164                 wpa_supplicant_notify_scanning(wpa_s, 0);
 165                 wpas_notify_scan_done(wpa_s, 0);
 166                 radio_work_done(work);
 167                 return;
 168         }
 169
 170         os_get_reltime(&wpa_s->scan_trigger_time);
 171         wpa_s->scan_runs++;
 172         wpa_s->normal_scans++;
 173         wpa_s->own_scan_requested = 1;
 174         wpa_s->clear_driver_scan_cache = 0;
 175         wpa_s->scan_work = work;
 176 }
 177
 178
 179 /**
 180  * wpa_supplicant_trigger_scan - Request driver to start a scan
 181  * @wpa_s: Pointer to wpa_supplicant data
 182  * @params: Scan parameters
 183  * Returns: 0 on success, -1 on failure
 184  */
 185 int wpa_supplicant_trigger_scan(struct wpa_supplicant *wpa_s,
 186                                 struct wpa_driver_scan_params *params)
 187 {
 188         struct wpa_driver_scan_params *ctx;
 189
 190         if (wpa_s->scan_work) {
 191                 wpa_dbg(wpa_s, MSG_INFO, "Reject scan trigger since one is already pending");
 192                 return -1;
 193         }
 194
 195         ctx = wpa_scan_clone_params(params);
 196         if (ctx == NULL)
 197                 return -1;
 198
 199         if (radio_add_work(wpa_s, 0, "scan", 0, wpas_trigger_scan_cb, ctx) < 0)
 200         {
 201                 wpa_scan_free_params(ctx);
 202                 return -1;
 203         }
 204
 205         return 0;
 206 }
 207
 208
 209 static void
 210 wpa_supplicant_delayed_sched_scan_timeout(void *eloop_ctx, void *timeout_ctx)
 211 {
 212         struct wpa_supplicant *wpa_s = eloop_ctx;
 213
 214         wpa_dbg(wpa_s, MSG_DEBUG, "Starting delayed sched scan");
 215
 216         if (wpa_supplicant_req_sched_scan(wpa_s))
 217                 wpa_supplicant_req_scan(wpa_s, 0, 0);
 218 }
 219
 220
 221 static void
 222 wpa_supplicant_sched_scan_timeout(void *eloop_ctx, void *timeout_ctx)
 223 {
 224         struct wpa_supplicant *wpa_s = eloop_ctx;
 225
 226         wpa_dbg(wpa_s, MSG_DEBUG, "Sched scan timeout - stopping it");
 227
 228         wpa_s->sched_scan_timed_out = 1;
 229         wpa_supplicant_cancel_sched_scan(wpa_s);
 230 }
 231
 232
 233 int wpa_supplicant_start_sched_scan(struct wpa_supplicant *wpa_s,
 234                                     struct wpa_driver_scan_params *params,
 235                                     int interval)
 236 {
 237         int ret;
 238
 239         wpa_supplicant_notify_scanning(wpa_s, 1);
 240         ret = wpa_drv_sched_scan(wpa_s, params, interval * 1000);
 241         if (ret)
 242                 wpa_supplicant_notify_scanning(wpa_s, 0);
 243         else
 244                 wpa_s->sched_scanning = 1;
 245
 246         return ret;
 247 }
 248
 249
 250 int wpa_supplicant_stop_sched_scan(struct wpa_supplicant *wpa_s)
 251 {
 252         int ret;
 253
 254         ret = wpa_drv_stop_sched_scan(wpa_s);
 255         if (ret) {
 256                 wpa_dbg(wpa_s, MSG_DEBUG, "stopping sched_scan failed!");
 257                 /* TODO: what to do if stopping fails? */
 258                 return -1;
 259         }
 260
 261         return ret;
 262 }
 263
 264
 265 static struct wpa_driver_scan_filter *
 266 wpa_supplicant_build_filter_ssids(struct wpa_config *conf, size_t *num_ssids)
 267 {
 268         struct wpa_driver_scan_filter *ssids;
 269         struct wpa_ssid *ssid;
 270         size_t count;
 271
 272         *num_ssids = 0;
 273         if (!conf->filter_ssids)
 274                 return NULL;
 275
 276         for (count = 0, ssid = conf->ssid; ssid; ssid = ssid->next) {
 277                 if (ssid->ssid && ssid->ssid_len)
 278                         count++;
 279         }
 280         if (count == 0)
 281                 return NULL;
 282         ssids = os_zalloc(count * sizeof(struct wpa_driver_scan_filter));
 283         if (ssids == NULL)
 284                 return NULL;
 285
 286         for (ssid = conf->ssid; ssid; ssid = ssid->next) {
 287                 if (!ssid->ssid || !ssid->ssid_len)
 288                         continue;
 289                 os_memcpy(ssids[*num_ssids].ssid, ssid->ssid, ssid->ssid_len);
 290                 ssids[*num_ssids].ssid_len = ssid->ssid_len;
 291                 (*num_ssids)++;
 292         }
 293
 294         return ssids;
 295 }
 296
 297
 298 static void wpa_supplicant_optimize_freqs(
 299         struct wpa_supplicant *wpa_s, struct wpa_driver_scan_params *params)
 300 {
 301 #ifdef CONFIG_P2P
 302         if (params->freqs == NULL && wpa_s->p2p_in_provisioning &&
 303             wpa_s->go_params) {
 304                 /* Optimize provisioning state scan based on GO information */
 305                 if (wpa_s->p2p_in_provisioning < 5 &&
 306                     wpa_s->go_params->freq > 0) {
 307                         wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only GO "
 308                                 "preferred frequency %d MHz",
 309                                 wpa_s->go_params->freq);
 310                         params->freqs = os_zalloc(2 * sizeof(int));
 311                         if (params->freqs)
 312                                 params->freqs[0] = wpa_s->go_params->freq;
 313                 } else if (wpa_s->p2p_in_provisioning < 8 &&
 314                            wpa_s->go_params->freq_list[0]) {
 315                         wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only common "
 316                                 "channels");
 317                         int_array_concat(&params->freqs,
 318                                          wpa_s->go_params->freq_list);
 319                         if (params->freqs)
 320                                 int_array_sort_unique(params->freqs);
 321                 }
 322                 wpa_s->p2p_in_provisioning++;
 323         }
 324 #endif /* CONFIG_P2P */
 325
 326 #ifdef CONFIG_WPS
 327         if (params->freqs == NULL && wpa_s->after_wps && wpa_s->wps_freq) {
 328                 /*
 329                  * Optimize post-provisioning scan based on channel used
 330                  * during provisioning.
 331                  */
 332                 wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Scan only frequency %u MHz "
 333                         "that was used during provisioning", wpa_s->wps_freq);
 334                 params->freqs = os_zalloc(2 * sizeof(int));
 335                 if (params->freqs)
 336                         params->freqs[0] = wpa_s->wps_freq;
 337                 wpa_s->after_wps--;
 338         } else if (wpa_s->after_wps)
 339                 wpa_s->after_wps--;
 340
 341         if (params->freqs == NULL && wpa_s->known_wps_freq && wpa_s->wps_freq)
 342         {
 343                 /* Optimize provisioning scan based on already known channel */
 344                 wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Scan only frequency %u MHz",
 345                         wpa_s->wps_freq);
 346                 params->freqs = os_zalloc(2 * sizeof(int));
 347                 if (params->freqs)
 348                         params->freqs[0] = wpa_s->wps_freq;
 349                 wpa_s->known_wps_freq = 0; /* only do this once */
 350         }
 351 #endif /* CONFIG_WPS */
 352 }
 353
 354
 355 #ifdef CONFIG_INTERWORKING
 356 static void wpas_add_interworking_elements(struct wpa_supplicant *wpa_s,
 357                                            struct wpabuf *buf)
 358 {
 359         if (wpa_s->conf->interworking == 0)
 360                 return;
 361
 362         wpabuf_put_u8(buf, WLAN_EID_EXT_CAPAB);
 363         wpabuf_put_u8(buf, 4);
 364         wpabuf_put_u8(buf, 0x00);
 365         wpabuf_put_u8(buf, 0x00);
 366         wpabuf_put_u8(buf, 0x00);
 367         wpabuf_put_u8(buf, 0x80); /* Bit 31 - Interworking */
 368
 369         wpabuf_put_u8(buf, WLAN_EID_INTERWORKING);
 370         wpabuf_put_u8(buf, is_zero_ether_addr(wpa_s->conf->hessid) ? 1 :
 371                       1 + ETH_ALEN);
 372         wpabuf_put_u8(buf, wpa_s->conf->access_network_type);
 373         /* No Venue Info */
 374         if (!is_zero_ether_addr(wpa_s->conf->hessid))
 375                 wpabuf_put_data(buf, wpa_s->conf->hessid, ETH_ALEN);
 376 }
 377 #endif /* CONFIG_INTERWORKING */
 378
 379
 380 static struct wpabuf * wpa_supplicant_extra_ies(struct wpa_supplicant *wpa_s)
 381 {
 382         struct wpabuf *extra_ie = NULL;
 383 #ifdef CONFIG_WPS
 384         int wps = 0;
 385         enum wps_request_type req_type = WPS_REQ_ENROLLEE_INFO;
 386 #endif /* CONFIG_WPS */
 387
 388 #ifdef CONFIG_INTERWORKING
 389         if (wpa_s->conf->interworking &&
 390             wpabuf_resize(&extra_ie, 100) == 0)
 391                 wpas_add_interworking_elements(wpa_s, extra_ie);
 392 #endif /* CONFIG_INTERWORKING */
 393
 394 #ifdef CONFIG_WPS
 395         wps = wpas_wps_in_use(wpa_s, &req_type);
 396
 397         if (wps) {
 398                 struct wpabuf *wps_ie;
 399                 wps_ie = wps_build_probe_req_ie(wps == 2 ? DEV_PW_PUSHBUTTON :
 400                                                 DEV_PW_DEFAULT,
 401                                                 &wpa_s->wps->dev,
 402                                                 wpa_s->wps->uuid, req_type,
 403                                                 0, NULL);
 404                 if (wps_ie) {
 405                         if (wpabuf_resize(&extra_ie, wpabuf_len(wps_ie)) == 0)
 406                                 wpabuf_put_buf(extra_ie, wps_ie);
 407                         wpabuf_free(wps_ie);
 408                 }
 409         }
 410
 411 #ifdef CONFIG_P2P
 412         if (wps) {
 413                 size_t ielen = p2p_scan_ie_buf_len(wpa_s->global->p2p);
 414                 if (wpabuf_resize(&extra_ie, ielen) == 0)
 415                         wpas_p2p_scan_ie(wpa_s, extra_ie);
 416         }
 417 #endif /* CONFIG_P2P */
 418
 419 #endif /* CONFIG_WPS */
 420
 421 #ifdef CONFIG_HS20
 422         if (wpa_s->conf->hs20 && wpabuf_resize(&extra_ie, 7) == 0)
 423                 wpas_hs20_add_indication(extra_ie);
 424 #endif /* CONFIG_HS20 */
 425
 426         return extra_ie;
 427 }
 428
 429
 430 #ifdef CONFIG_P2P
 431
 432 /*
 433  * Check whether there are any enabled networks or credentials that could be
 434  * used for a non-P2P connection.
 435  */
 436 static int non_p2p_network_enabled(struct wpa_supplicant *wpa_s)
 437 {
 438         struct wpa_ssid *ssid;
 439
 440         for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
 441                 if (wpas_network_disabled(wpa_s, ssid))
 442                         continue;
 443                 if (!ssid->p2p_group)
 444                         return 1;
 445         }
 446
 447         if (wpa_s->conf->cred && wpa_s->conf->interworking &&
 448             wpa_s->conf->auto_interworking)
 449                 return 1;
 450
 451         return 0;
 452 }
 453
 454 #endif /* CONFIG_P2P */
 455
 456
 457 static struct hostapd_hw_modes * get_mode(struct hostapd_hw_modes *modes,
 458                                           u16 num_modes,
 459                                           enum hostapd_hw_mode mode)
 460 {
 461         u16 i;
 462
 463         for (i = 0; i < num_modes; i++) {
 464                 if (modes[i].mode == mode)
 465                         return &modes[i];
 466         }
 467
 468         return NULL;
 469 }
 470
 471
 472 static void wpa_setband_scan_freqs_list(struct wpa_supplicant *wpa_s,
 473                                         enum hostapd_hw_mode band,
 474                                         struct wpa_driver_scan_params *params)
 475 {
 476         /* Include only supported channels for the specified band */
 477         struct hostapd_hw_modes *mode;
 478         int count, i;
 479
 480         mode = get_mode(wpa_s->hw.modes, wpa_s->hw.num_modes, band);
 481         if (mode == NULL) {
 482                 /* No channels supported in this band - use empty list */
 483                 params->freqs = os_zalloc(sizeof(int));
 484                 return;
 485         }
 486
 487         params->freqs = os_zalloc((mode->num_channels + 1) * sizeof(int));
 488         if (params->freqs == NULL)
 489                 return;
 490         for (count = 0, i = 0; i < mode->num_channels; i++) {
 491                 if (mode->channels[i].flag & HOSTAPD_CHAN_DISABLED)
 492                         continue;
 493                 params->freqs[count++] = mode->channels[i].freq;
 494         }
 495 }
 496
 497
 498 static void wpa_setband_scan_freqs(struct wpa_supplicant *wpa_s,
 499                                    struct wpa_driver_scan_params *params)
 500 {
 501         if (wpa_s->hw.modes == NULL)
 502                 return; /* unknown what channels the driver supports */
 503         if (params->freqs)
 504                 return; /* already using a limited channel set */
 505         if (wpa_s->setband == WPA_SETBAND_5G)
 506                 wpa_setband_scan_freqs_list(wpa_s, HOSTAPD_MODE_IEEE80211A,
 507                                             params);
 508         else if (wpa_s->setband == WPA_SETBAND_2G)
 509                 wpa_setband_scan_freqs_list(wpa_s, HOSTAPD_MODE_IEEE80211G,
 510                                             params);
 511 }
 512
 513
 514 static void wpa_supplicant_scan(void *eloop_ctx, void *timeout_ctx)
 515 {
 516         struct wpa_supplicant *wpa_s = eloop_ctx;
 517         struct wpa_ssid *ssid;
 518         int ret;
 519         struct wpabuf *extra_ie = NULL;
 520         struct wpa_driver_scan_params params;
 521         struct wpa_driver_scan_params *scan_params;
 522         size_t max_ssids;
 523         enum wpa_states prev_state;
 524
 525         if (wpa_s->wpa_state == WPA_INTERFACE_DISABLED) {
 526                 wpa_dbg(wpa_s, MSG_DEBUG, "Skip scan - interface disabled");
 527                 wpas_p2p_continue_after_scan(wpa_s);
 528                 return;
 529         }
 530
 531         if (wpa_s->disconnected && wpa_s->scan_req == NORMAL_SCAN_REQ) {
 532                 wpa_dbg(wpa_s, MSG_DEBUG, "Disconnected - do not scan");
 533                 wpa_supplicant_set_state(wpa_s, WPA_DISCONNECTED);
 534                 wpas_p2p_continue_after_scan(wpa_s);
 535                 return;
 536         }
 537
 538         if (wpa_s->scanning) {
 539                 /*
 540                  * If we are already in scanning state, we shall reschedule the
 541                  * the incoming scan request.
 542                  */
 543                 wpa_dbg(wpa_s, MSG_DEBUG, "Already scanning - Reschedule the incoming scan req");
 544                 wpa_supplicant_req_scan(wpa_s, 1, 0);
 545                 return;
 546         }
 547
 548         if (wpa_s->external_scan_running) {
 549                 struct os_reltime now, diff;
 550                 os_get_reltime(&now);
 551                 os_reltime_sub(&now, &wpa_s->scan_start_time, &diff);
 552                 if (diff.sec < 30) {
 553                         wpa_dbg(wpa_s, MSG_DEBUG, "Externally triggered scan running - Reschedule the incoming scan req");
 554                         wpa_supplicant_req_scan(wpa_s, 1, 0);
 555                         return;
 556                 }
 557         }
 558
 559         if (!wpa_supplicant_enabled_networks(wpa_s) &&
 560             wpa_s->scan_req == NORMAL_SCAN_REQ) {
 561                 wpa_dbg(wpa_s, MSG_DEBUG, "No enabled networks - do not scan");
 562                 wpa_supplicant_set_state(wpa_s, WPA_INACTIVE);
 563                 wpas_p2p_continue_after_scan(wpa_s);
 564                 return;
 565         }
 566
 567         if (wpa_s->conf->ap_scan != 0 &&
 568             (wpa_s->drv_flags & WPA_DRIVER_FLAGS_WIRED)) {
 569                 wpa_dbg(wpa_s, MSG_DEBUG, "Using wired authentication - "
 570                         "overriding ap_scan configuration");
 571                 wpa_s->conf->ap_scan = 0;
 572                 wpas_notify_ap_scan_changed(wpa_s);
 573         }
 574
 575         if (wpa_s->conf->ap_scan == 0) {
 576                 wpa_supplicant_gen_assoc_event(wpa_s);
 577                 return;
 578         }
 579
 580 #ifdef CONFIG_P2P
 581         if (wpas_p2p_in_progress(wpa_s) || wpas_wpa_is_in_progress(wpa_s, 0)) {
 582                 if (wpa_s->sta_scan_pending &&
 583                     wpas_p2p_in_progress(wpa_s) == 2 &&
 584                     wpa_s->global->p2p_cb_on_scan_complete) {
 585                         wpa_dbg(wpa_s, MSG_DEBUG, "Process pending station "
 586                                 "mode scan during P2P search");
 587                 } else {
 588                         wpa_dbg(wpa_s, MSG_DEBUG, "Delay station mode scan "
 589                                 "while P2P operation is in progress");
 590                         wpa_s->sta_scan_pending = 1;
 591                         wpa_supplicant_req_scan(wpa_s, 5, 0);
 592                         return;
 593                 }
 594         }
 595 #endif /* CONFIG_P2P */
 596
 597 #ifdef CONFIG_GAS
 598         if (gas_query_in_progress(wpa_s->gas)) {
 599                 wpa_dbg(wpa_s, MSG_DEBUG, "Delay scan while GAS query is in progress");
 600                 wpa_supplicant_req_scan(wpa_s, 1, 0);
 601                 return;
 602         }
 603 #endif /* CONFIG_GAS */
 604
 605         if (wpa_s->conf->ap_scan == 2)
 606                 max_ssids = 1;
 607         else {
 608                 max_ssids = wpa_s->max_scan_ssids;
 609                 if (max_ssids > WPAS_MAX_SCAN_SSIDS)
 610                         max_ssids = WPAS_MAX_SCAN_SSIDS;
 611         }
 612
 613         wpa_s->last_scan_req = wpa_s->scan_req;
 614         wpa_s->scan_req = NORMAL_SCAN_REQ;
 615
 616         os_memset(&params, 0, sizeof(params));
 617
 618         prev_state = wpa_s->wpa_state;
 619         if (wpa_s->wpa_state == WPA_DISCONNECTED ||
 620             wpa_s->wpa_state == WPA_INACTIVE)
 621                 wpa_supplicant_set_state(wpa_s, WPA_SCANNING);
 622
 623         /*
 624          * If autoscan has set its own scanning parameters
 625          */
 626         if (wpa_s->autoscan_params != NULL) {
 627                 scan_params = wpa_s->autoscan_params;
 628                 goto scan;
 629         }
 630
 631         if (wpa_s->last_scan_req != MANUAL_SCAN_REQ &&
 632             wpa_s->connect_without_scan) {
 633                 for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
 634                         if (ssid == wpa_s->connect_without_scan)
 635                                 break;
 636                 }
 637                 wpa_s->connect_without_scan = NULL;
 638                 if (ssid) {
 639                         wpa_printf(MSG_DEBUG, "Start a pre-selected network "
 640                                    "without scan step");
 641                         wpa_supplicant_associate(wpa_s, NULL, ssid);
 642                         return;
 643                 }
 644         }
 645
 646 #ifdef CONFIG_P2P
 647         if ((wpa_s->p2p_in_provisioning || wpa_s->show_group_started) &&
 648             wpa_s->go_params) {
 649                 wpa_printf(MSG_DEBUG, "P2P: Use specific SSID for scan during P2P group formation (p2p_in_provisioning=%d show_group_started=%d)",
 650                            wpa_s->p2p_in_provisioning,
 651                            wpa_s->show_group_started);
 652                 params.ssids[0].ssid = wpa_s->go_params->ssid;
 653                 params.ssids[0].ssid_len = wpa_s->go_params->ssid_len;
 654                 params.num_ssids = 1;
 655                 goto ssid_list_set;
 656         }
 657 #endif /* CONFIG_P2P */
 658
 659         /* Find the starting point from which to continue scanning */
 660         ssid = wpa_s->conf->ssid;
 661         if (wpa_s->prev_scan_ssid != WILDCARD_SSID_SCAN) {
 662                 while (ssid) {
 663                         if (ssid == wpa_s->prev_scan_ssid) {
 664                                 ssid = ssid->next;
 665                                 break;
 666                         }
 667                         ssid = ssid->next;
 668                 }
 669         }
 670
 671         if (wpa_s->last_scan_req != MANUAL_SCAN_REQ &&
 672             wpa_s->conf->ap_scan == 2) {
 673                 wpa_s->connect_without_scan = NULL;
 674                 wpa_s->prev_scan_wildcard = 0;
 675                 wpa_supplicant_assoc_try(wpa_s, ssid);
 676                 return;
 677         } else if (wpa_s->conf->ap_scan == 2) {
 678                 /*
 679                  * User-initiated scan request in ap_scan == 2; scan with
 680                  * wildcard SSID.
 681                  */
 682                 ssid = NULL;
 683         } else {
 684                 struct wpa_ssid *start = ssid, *tssid;
 685                 int freqs_set = 0;
 686                 if (ssid == NULL && max_ssids > 1)
 687                         ssid = wpa_s->conf->ssid;
 688                 while (ssid) {
 689                         if (!wpas_network_disabled(wpa_s, ssid) &&
 690                             ssid->scan_ssid) {
 691                                 wpa_hexdump_ascii(MSG_DEBUG, "Scan SSID",
 692                                                   ssid->ssid, ssid->ssid_len);
 693                                 params.ssids[params.num_ssids].ssid =
 694                                         ssid->ssid;
 695                                 params.ssids[params.num_ssids].ssid_len =
 696                                         ssid->ssid_len;
 697                                 params.num_ssids++;
 698                                 if (params.num_ssids + 1 >= max_ssids)
 699                                         break;
 700                         }
 701                         ssid = ssid->next;
 702                         if (ssid == start)
 703                                 break;
 704                         if (ssid == NULL && max_ssids > 1 &&
 705                             start != wpa_s->conf->ssid)
 706                                 ssid = wpa_s->conf->ssid;
 707                 }
 708
 709                 for (tssid = wpa_s->conf->ssid; tssid; tssid = tssid->next) {
 710                         if (wpas_network_disabled(wpa_s, tssid))
 711                                 continue;
 712                         if ((params.freqs || !freqs_set) && tssid->scan_freq) {
 713                                 int_array_concat(&params.freqs,
 714                                                  tssid->scan_freq);
 715                         } else {
 716                                 os_free(params.freqs);
 717                                 params.freqs = NULL;
 718                         }
 719                         freqs_set = 1;
 720                 }
 721                 int_array_sort_unique(params.freqs);
 722         }
 723
 724         if (ssid && max_ssids == 1) {
 725                 /*
 726                  * If the driver is limited to 1 SSID at a time interleave
 727                  * wildcard SSID scans with specific SSID scans to avoid
 728                  * waiting a long time for a wildcard scan.
 729                  */
 730                 if (!wpa_s->prev_scan_wildcard) {
 731                         params.ssids[0].ssid = NULL;
 732                         params.ssids[0].ssid_len = 0;
 733                         wpa_s->prev_scan_wildcard = 1;
 734                         wpa_dbg(wpa_s, MSG_DEBUG, "Starting AP scan for "
 735                                 "wildcard SSID (Interleave with specific)");
 736                 } else {
 737                         wpa_s->prev_scan_ssid = ssid;
 738                         wpa_s->prev_scan_wildcard = 0;
 739                         wpa_dbg(wpa_s, MSG_DEBUG,
 740                                 "Starting AP scan for specific SSID: %s",
 741                                 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
 742                 }
 743         } else if (ssid) {
 744                 /* max_ssids > 1 */
 745
 746                 wpa_s->prev_scan_ssid = ssid;
 747                 wpa_dbg(wpa_s, MSG_DEBUG, "Include wildcard SSID in "
 748                         "the scan request");
 749                 params.num_ssids++;
 750         } else if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
 751                    wpa_s->manual_scan_passive && params.num_ssids == 0) {
 752                 wpa_dbg(wpa_s, MSG_DEBUG, "Use passive scan based on manual request");
 753         } else {
 754                 wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
 755                 params.num_ssids++;
 756                 wpa_dbg(wpa_s, MSG_DEBUG, "Starting AP scan for wildcard "
 757                         "SSID");
 758         }
 759 #ifdef CONFIG_P2P
 760 ssid_list_set:
 761 #endif /* CONFIG_P2P */
 762
 763         wpa_supplicant_optimize_freqs(wpa_s, &params);
 764         extra_ie = wpa_supplicant_extra_ies(wpa_s);
 765
 766         if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
 767             wpa_s->manual_scan_only_new)
 768                 params.only_new_results = 1;
 769
 770         if (wpa_s->last_scan_req == MANUAL_SCAN_REQ && params.freqs == NULL &&
 771             wpa_s->manual_scan_freqs) {
 772                 wpa_dbg(wpa_s, MSG_DEBUG, "Limit manual scan to specified channels");
 773                 params.freqs = wpa_s->manual_scan_freqs;
 774                 wpa_s->manual_scan_freqs = NULL;
 775         }
 776
 777         if (params.freqs == NULL && wpa_s->next_scan_freqs) {
 778                 wpa_dbg(wpa_s, MSG_DEBUG, "Optimize scan based on previously "
 779                         "generated frequency list");
 780                 params.freqs = wpa_s->next_scan_freqs;
 781         } else
 782                 os_free(wpa_s->next_scan_freqs);
 783         wpa_s->next_scan_freqs = NULL;
 784         wpa_setband_scan_freqs(wpa_s, &params);
 785
 786         /* See if user specified frequencies. If so, scan only those. */
 787         if (wpa_s->conf->freq_list && !params.freqs) {
 788                 wpa_dbg(wpa_s, MSG_DEBUG,
 789                         "Optimize scan based on conf->freq_list");
 790                 int_array_concat(&params.freqs, wpa_s->conf->freq_list);
 791         }
 792
 793         /* Use current associated channel? */
 794         if (wpa_s->conf->scan_cur_freq && !params.freqs) {
 795                 unsigned int num = wpa_s->num_multichan_concurrent;
 796
 797                 params.freqs = os_calloc(num + 1, sizeof(int));
 798                 if (params.freqs) {
 799                         num = get_shared_radio_freqs(wpa_s, params.freqs, num);
 800                         if (num > 0) {
 801                                 wpa_dbg(wpa_s, MSG_DEBUG, "Scan only the "
 802                                         "current operating channels since "
 803                                         "scan_cur_freq is enabled");
 804                         } else {
 805                                 os_free(params.freqs);
 806                                 params.freqs = NULL;
 807                         }
 808                 }
 809         }
 810
 811         params.filter_ssids = wpa_supplicant_build_filter_ssids(
 812                 wpa_s->conf, &params.num_filter_ssids);
 813         if (extra_ie) {
 814                 params.extra_ies = wpabuf_head(extra_ie);
 815                 params.extra_ies_len = wpabuf_len(extra_ie);
 816         }
 817
 818 #ifdef CONFIG_P2P
 819         if (wpa_s->p2p_in_provisioning ||
 820             (wpa_s->show_group_started && wpa_s->go_params)) {
 821                 /*
 822                  * The interface may not yet be in P2P mode, so we have to
 823                  * explicitly request P2P probe to disable CCK rates.
 824                  */
 825                 params.p2p_probe = 1;
 826         }
 827 #endif /* CONFIG_P2P */
 828
 829         scan_params = &params;
 830
 831 scan:
 832 #ifdef CONFIG_P2P
 833         /*
 834          * If the driver does not support multi-channel concurrency and a
 835          * virtual interface that shares the same radio with the wpa_s interface
 836          * is operating there may not be need to scan other channels apart from
 837          * the current operating channel on the other virtual interface. Filter
 838          * out other channels in case we are trying to find a connection for a
 839          * station interface when we are not configured to prefer station
 840          * connection and a concurrent operation is already in process.
 841          */
 842         if (wpa_s->scan_for_connection &&
 843             wpa_s->last_scan_req == NORMAL_SCAN_REQ &&
 844             !scan_params->freqs && !params.freqs &&
 845             wpas_is_p2p_prioritized(wpa_s) &&
 846             wpa_s->p2p_group_interface == NOT_P2P_GROUP_INTERFACE &&
 847             non_p2p_network_enabled(wpa_s)) {
 848                 unsigned int num = wpa_s->num_multichan_concurrent;
 849
 850                 params.freqs = os_calloc(num + 1, sizeof(int));
 851                 if (params.freqs) {
 852                         num = get_shared_radio_freqs(wpa_s, params.freqs, num);
 853                         if (num > 0 && num == wpa_s->num_multichan_concurrent) {
 854                                 wpa_dbg(wpa_s, MSG_DEBUG, "Scan only the current operating channels since all channels are already used");
 855                         } else {
 856                                 os_free(params.freqs);
 857                                 params.freqs = NULL;
 858                         }
 859                 }
 860         }
 861 #endif /* CONFIG_P2P */
 862
 863         ret = wpa_supplicant_trigger_scan(wpa_s, scan_params);
 864
 865         if (ret && wpa_s->last_scan_req == MANUAL_SCAN_REQ && params.freqs &&
 866             !wpa_s->manual_scan_freqs) {
 867                 /* Restore manual_scan_freqs for the next attempt */
 868                 wpa_s->manual_scan_freqs = params.freqs;
 869                 params.freqs = NULL;
 870         }
 871
 872         wpabuf_free(extra_ie);
 873         os_free(params.freqs);
 874         os_free(params.filter_ssids);
 875
 876         if (ret) {
 877                 wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate AP scan");
 878                 if (prev_state != wpa_s->wpa_state)
 879                         wpa_supplicant_set_state(wpa_s, prev_state);
 880                 /* Restore scan_req since we will try to scan again */
 881                 wpa_s->scan_req = wpa_s->last_scan_req;
 882                 wpa_supplicant_req_scan(wpa_s, 1, 0);
 883         } else {
 884                 wpa_s->scan_for_connection = 0;
 885         }
 886 }
 887
 888
 889 void wpa_supplicant_update_scan_int(struct wpa_supplicant *wpa_s, int sec)
 890 {
 891         struct os_reltime remaining, new_int;
 892         int cancelled;
 893
 894         cancelled = eloop_cancel_timeout_one(wpa_supplicant_scan, wpa_s, NULL,
 895                                              &remaining);
 896
 897         new_int.sec = sec;
 898         new_int.usec = 0;
 899         if (cancelled && os_reltime_before(&remaining, &new_int)) {
 900                 new_int.sec = remaining.sec;
 901                 new_int.usec = remaining.usec;
 902         }
 903
 904         if (cancelled) {
 905                 eloop_register_timeout(new_int.sec, new_int.usec,
 906                                        wpa_supplicant_scan, wpa_s, NULL);
 907         }
 908         wpa_s->scan_interval = sec;
 909 }
 910
 911
 912 /**
 913  * wpa_supplicant_req_scan - Schedule a scan for neighboring access points
 914  * @wpa_s: Pointer to wpa_supplicant data
 915  * @sec: Number of seconds after which to scan
 916  * @usec: Number of microseconds after which to scan
 917  *
 918  * This function is used to schedule a scan for neighboring access points after
 919  * the specified time.
 920  */
 921 void wpa_supplicant_req_scan(struct wpa_supplicant *wpa_s, int sec, int usec)
 922 {
 923         if (eloop_deplete_timeout(sec, usec, wpa_supplicant_scan, wpa_s, NULL))
 924         {
 925                 wpa_dbg(wpa_s, MSG_DEBUG, "Rescheduling scan request: %d sec %d usec",
 926                         sec, usec);
 927                 return;
 928         }
 929
 930         wpa_dbg(wpa_s, MSG_DEBUG, "Setting scan request: %d sec %d usec",
 931                 sec, usec);
 932         eloop_cancel_timeout(wpa_supplicant_scan, wpa_s, NULL);
 933         eloop_register_timeout(sec, usec, wpa_supplicant_scan, wpa_s, NULL);
 934 }
 935
 936
 937 /**
 938  * wpa_supplicant_delayed_sched_scan - Request a delayed scheduled scan
 939  * @wpa_s: Pointer to wpa_supplicant data
 940  * @sec: Number of seconds after which to scan
 941  * @usec: Number of microseconds after which to scan
 942  * Returns: 0 on success or -1 otherwise
 943  *
 944  * This function is used to schedule periodic scans for neighboring
 945  * access points after the specified time.
 946  */
 947 int wpa_supplicant_delayed_sched_scan(struct wpa_supplicant *wpa_s,
 948                                       int sec, int usec)
 949 {
 950         if (!wpa_s->sched_scan_supported)
 951                 return -1;
 952
 953         eloop_register_timeout(sec, usec,
 954                                wpa_supplicant_delayed_sched_scan_timeout,
 955                                wpa_s, NULL);
 956
 957         return 0;
 958 }
 959
 960
 961 /**
 962  * wpa_supplicant_req_sched_scan - Start a periodic scheduled scan
 963  * @wpa_s: Pointer to wpa_supplicant data
 964  * Returns: 0 is sched_scan was started or -1 otherwise
 965  *
 966  * This function is used to schedule periodic scans for neighboring
 967  * access points repeating the scan continuously.
 968  */
 969 int wpa_supplicant_req_sched_scan(struct wpa_supplicant *wpa_s)
 970 {
 971         struct wpa_driver_scan_params params;
 972         struct wpa_driver_scan_params *scan_params;
 973         enum wpa_states prev_state;
 974         struct wpa_ssid *ssid = NULL;
 975         struct wpabuf *extra_ie = NULL;
 976         int ret;
 977         unsigned int max_sched_scan_ssids;
 978         int wildcard = 0;
 979         int need_ssids;
 980
 981         if (!wpa_s->sched_scan_supported)
 982                 return -1;
 983
 984         if (wpa_s->max_sched_scan_ssids > WPAS_MAX_SCAN_SSIDS)
 985                 max_sched_scan_ssids = WPAS_MAX_SCAN_SSIDS;
 986         else
 987                 max_sched_scan_ssids = wpa_s->max_sched_scan_ssids;
 988         if (max_sched_scan_ssids < 1 || wpa_s->conf->disable_scan_offload)
 989                 return -1;
 990
 991         if (wpa_s->sched_scanning) {
 992                 wpa_dbg(wpa_s, MSG_DEBUG, "Already sched scanning");
 993                 return 0;
 994         }
 995
 996         need_ssids = 0;
 997         for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
 998                 if (!wpas_network_disabled(wpa_s, ssid) && !ssid->scan_ssid) {
 999                         /* Use wildcard SSID to find this network */
1000                         wildcard = 1;
1001                 } else if (!wpas_network_disabled(wpa_s, ssid) &&
1002                            ssid->ssid_len)
1003                         need_ssids++;
1004
1005 #ifdef CONFIG_WPS
1006                 if (!wpas_network_disabled(wpa_s, ssid) &&
1007                     ssid->key_mgmt == WPA_KEY_MGMT_WPS) {
1008                         /*
1009                          * Normal scan is more reliable and faster for WPS
1010                          * operations and since these are for short periods of
1011                          * time, the benefit of trying to use sched_scan would
1012                          * be limited.
1013                          */
1014                         wpa_dbg(wpa_s, MSG_DEBUG, "Use normal scan instead of "
1015                                 "sched_scan for WPS");
1016                         return -1;
1017                 }
1018 #endif /* CONFIG_WPS */
1019         }
1020         if (wildcard)
1021                 need_ssids++;
1022
1023         if (wpa_s->normal_scans < 3 &&
1024             (need_ssids <= wpa_s->max_scan_ssids ||
1025              wpa_s->max_scan_ssids >= (int) max_sched_scan_ssids)) {
1026                 /*
1027                  * When normal scan can speed up operations, use that for the
1028                  * first operations before starting the sched_scan to allow
1029                  * user space sleep more. We do this only if the normal scan
1030                  * has functionality that is suitable for this or if the
1031                  * sched_scan does not have better support for multiple SSIDs.
1032                  */
1033                 wpa_dbg(wpa_s, MSG_DEBUG, "Use normal scan instead of "
1034                         "sched_scan for initial scans (normal_scans=%d)",
1035                         wpa_s->normal_scans);
1036                 return -1;
1037         }
1038
1039         os_memset(&params, 0, sizeof(params));
1040
1041         /* If we can't allocate space for the filters, we just don't filter */
1042         params.filter_ssids = os_zalloc(wpa_s->max_match_sets *
1043                                         sizeof(struct wpa_driver_scan_filter));
1044
1045         prev_state = wpa_s->wpa_state;
1046         if (wpa_s->wpa_state == WPA_DISCONNECTED ||
1047             wpa_s->wpa_state == WPA_INACTIVE)
1048                 wpa_supplicant_set_state(wpa_s, WPA_SCANNING);
1049
1050         if (wpa_s->autoscan_params != NULL) {
1051                 scan_params = wpa_s->autoscan_params;
1052                 goto scan;
1053         }
1054
1055         /* Find the starting point from which to continue scanning */
1056         ssid = wpa_s->conf->ssid;
1057         if (wpa_s->prev_sched_ssid) {
1058                 while (ssid) {
1059                         if (ssid == wpa_s->prev_sched_ssid) {
1060                                 ssid = ssid->next;
1061                                 break;
1062                         }
1063                         ssid = ssid->next;
1064                 }
1065         }
1066
1067         if (!ssid || !wpa_s->prev_sched_ssid) {
1068                 wpa_dbg(wpa_s, MSG_DEBUG, "Beginning of SSID list");
1069                 if (wpa_s->conf->sched_scan_interval)
1070                         wpa_s->sched_scan_interval =
1071                                 wpa_s->conf->sched_scan_interval;
1072                 if (wpa_s->sched_scan_interval == 0)
1073                         wpa_s->sched_scan_interval = 10;
1074                 wpa_s->sched_scan_timeout = max_sched_scan_ssids * 2;
1075                 wpa_s->first_sched_scan = 1;
1076                 ssid = wpa_s->conf->ssid;
1077                 wpa_s->prev_sched_ssid = ssid;
1078         }
1079
1080         if (wildcard) {
1081                 wpa_dbg(wpa_s, MSG_DEBUG, "Add wildcard SSID to sched_scan");
1082                 params.num_ssids++;
1083         }
1084
1085         while (ssid) {
1086                 if (wpas_network_disabled(wpa_s, ssid))
1087                         goto next;
1088
1089                 if (params.num_filter_ssids < wpa_s->max_match_sets &&
1090                     params.filter_ssids && ssid->ssid && ssid->ssid_len) {
1091                         wpa_dbg(wpa_s, MSG_DEBUG, "add to filter ssid: %s",
1092                                 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
1093                         os_memcpy(params.filter_ssids[params.num_filter_ssids].ssid,
1094                                   ssid->ssid, ssid->ssid_len);
1095                         params.filter_ssids[params.num_filter_ssids].ssid_len =
1096                                 ssid->ssid_len;
1097                         params.num_filter_ssids++;
1098                 } else if (params.filter_ssids && ssid->ssid && ssid->ssid_len)
1099                 {
1100                         wpa_dbg(wpa_s, MSG_DEBUG, "Not enough room for SSID "
1101                                 "filter for sched_scan - drop filter");
1102                         os_free(params.filter_ssids);
1103                         params.filter_ssids = NULL;
1104                         params.num_filter_ssids = 0;
1105                 }
1106
1107                 if (ssid->scan_ssid && ssid->ssid && ssid->ssid_len) {
1108                         if (params.num_ssids == max_sched_scan_ssids)
1109                                 break; /* only room for broadcast SSID */
1110                         wpa_dbg(wpa_s, MSG_DEBUG,
1111                                 "add to active scan ssid: %s",
1112                                 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
1113                         params.ssids[params.num_ssids].ssid =
1114                                 ssid->ssid;
1115                         params.ssids[params.num_ssids].ssid_len =
1116                                 ssid->ssid_len;
1117                         params.num_ssids++;
1118                         if (params.num_ssids >= max_sched_scan_ssids) {
1119                                 wpa_s->prev_sched_ssid = ssid;
1120                                 do {
1121                                         ssid = ssid->next;
1122                                 } while (ssid &&
1123                                          (wpas_network_disabled(wpa_s, ssid) ||
1124                                           !ssid->scan_ssid));
1125                                 break;
1126                         }
1127                 }
1128
1129         next:
1130                 wpa_s->prev_sched_ssid = ssid;
1131                 ssid = ssid->next;
1132         }
1133
1134         if (params.num_filter_ssids == 0) {
1135                 os_free(params.filter_ssids);
1136                 params.filter_ssids = NULL;
1137         }
1138
1139         extra_ie = wpa_supplicant_extra_ies(wpa_s);
1140         if (extra_ie) {
1141                 params.extra_ies = wpabuf_head(extra_ie);
1142                 params.extra_ies_len = wpabuf_len(extra_ie);
1143         }
1144
1145         scan_params = &params;
1146
1147 scan:
1148         if (ssid || !wpa_s->first_sched_scan) {
1149                 wpa_dbg(wpa_s, MSG_DEBUG,
1150                         "Starting sched scan: interval %d timeout %d",
1151                         wpa_s->sched_scan_interval, wpa_s->sched_scan_timeout);
1152         } else {
1153                 wpa_dbg(wpa_s, MSG_DEBUG,
1154                         "Starting sched scan: interval %d (no timeout)",
1155                         wpa_s->sched_scan_interval);
1156         }
1157
1158         wpa_setband_scan_freqs(wpa_s, scan_params);
1159
1160         ret = wpa_supplicant_start_sched_scan(wpa_s, scan_params,
1161                                               wpa_s->sched_scan_interval);
1162         wpabuf_free(extra_ie);
1163         os_free(params.filter_ssids);
1164         if (ret) {
1165                 wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate sched scan");
1166                 if (prev_state != wpa_s->wpa_state)
1167                         wpa_supplicant_set_state(wpa_s, prev_state);
1168                 return ret;
1169         }
1170
1171         /* If we have more SSIDs to scan, add a timeout so we scan them too */
1172         if (ssid || !wpa_s->first_sched_scan) {
1173                 wpa_s->sched_scan_timed_out = 0;
1174                 eloop_register_timeout(wpa_s->sched_scan_timeout, 0,
1175                                        wpa_supplicant_sched_scan_timeout,
1176                                        wpa_s, NULL);
1177                 wpa_s->first_sched_scan = 0;
1178                 wpa_s->sched_scan_timeout /= 2;
1179                 wpa_s->sched_scan_interval *= 2;
1180                 if (wpa_s->sched_scan_timeout < wpa_s->sched_scan_interval) {
1181                         wpa_s->sched_scan_interval = 10;
1182                         wpa_s->sched_scan_timeout = max_sched_scan_ssids * 2;
1183                 }
1184         }
1185
1186         /* If there is no more ssids, start next time from the beginning */
1187         if (!ssid)
1188                 wpa_s->prev_sched_ssid = NULL;
1189
1190         return 0;
1191 }
1192
1193
1194 /**
1195  * wpa_supplicant_cancel_scan - Cancel a scheduled scan request
1196  * @wpa_s: Pointer to wpa_supplicant data
1197  *
1198  * This function is used to cancel a scan request scheduled with
1199  * wpa_supplicant_req_scan().
1200  */
1201 void wpa_supplicant_cancel_scan(struct wpa_supplicant *wpa_s)
1202 {
1203         wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling scan request");
1204         eloop_cancel_timeout(wpa_supplicant_scan, wpa_s, NULL);
1205         wpas_p2p_continue_after_scan(wpa_s);
1206 }
1207
1208
1209 /**
1210  * wpa_supplicant_cancel_delayed_sched_scan - Stop a delayed scheduled scan
1211  * @wpa_s: Pointer to wpa_supplicant data
1212  *
1213  * This function is used to stop a delayed scheduled scan.
1214  */
1215 void wpa_supplicant_cancel_delayed_sched_scan(struct wpa_supplicant *wpa_s)
1216 {
1217         if (!wpa_s->sched_scan_supported)
1218                 return;
1219
1220         wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling delayed sched scan");
1221         eloop_cancel_timeout(wpa_supplicant_delayed_sched_scan_timeout,
1222                              wpa_s, NULL);
1223 }
1224
1225
1226 /**
1227  * wpa_supplicant_cancel_sched_scan - Stop running scheduled scans
1228  * @wpa_s: Pointer to wpa_supplicant data
1229  *
1230  * This function is used to stop a periodic scheduled scan.
1231  */
1232 void wpa_supplicant_cancel_sched_scan(struct wpa_supplicant *wpa_s)
1233 {
1234         if (!wpa_s->sched_scanning)
1235                 return;
1236
1237         wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling sched scan");
1238         eloop_cancel_timeout(wpa_supplicant_sched_scan_timeout, wpa_s, NULL);
1239         wpa_supplicant_stop_sched_scan(wpa_s);
1240 }
1241
1242
1243 /**
1244  * wpa_supplicant_notify_scanning - Indicate possible scan state change
1245  * @wpa_s: Pointer to wpa_supplicant data
1246  * @scanning: Whether scanning is currently in progress
1247  *
1248  * This function is to generate scanning notifycations. It is called whenever
1249  * there may have been a change in scanning (scan started, completed, stopped).
1250  * wpas_notify_scanning() is called whenever the scanning state changed from the
1251  * previously notified state.
1252  */
1253 void wpa_supplicant_notify_scanning(struct wpa_supplicant *wpa_s,
1254                                     int scanning)
1255 {
1256         if (wpa_s->scanning != scanning) {
1257                 wpa_s->scanning = scanning;
1258                 wpas_notify_scanning(wpa_s);
1259         }
1260 }
1261
1262
1263 static int wpa_scan_get_max_rate(const struct wpa_scan_res *res)
1264 {
1265         int rate = 0;
1266         const u8 *ie;
1267         int i;
1268
1269         ie = wpa_scan_get_ie(res, WLAN_EID_SUPP_RATES);
1270         for (i = 0; ie && i < ie[1]; i++) {
1271                 if ((ie[i + 2] & 0x7f) > rate)
1272                         rate = ie[i + 2] & 0x7f;
1273         }
1274
1275         ie = wpa_scan_get_ie(res, WLAN_EID_EXT_SUPP_RATES);
1276         for (i = 0; ie && i < ie[1]; i++) {
1277                 if ((ie[i + 2] & 0x7f) > rate)
1278                         rate = ie[i + 2] & 0x7f;
1279         }
1280
1281         return rate;
1282 }
1283
1284
1285 /**
1286  * wpa_scan_get_ie - Fetch a specified information element from a scan result
1287  * @res: Scan result entry
1288  * @ie: Information element identitifier (WLAN_EID_*)
1289  * Returns: Pointer to the information element (id field) or %NULL if not found
1290  *
1291  * This function returns the first matching information element in the scan
1292  * result.
1293  */
1294 const u8 * wpa_scan_get_ie(const struct wpa_scan_res *res, u8 ie)
1295 {
1296         const u8 *end, *pos;
1297
1298         pos = (const u8 *) (res + 1);
1299         end = pos + res->ie_len;
1300
1301         while (pos + 1 < end) {
1302                 if (pos + 2 + pos[1] > end)
1303                         break;
1304                 if (pos[0] == ie)
1305                         return pos;
1306                 pos += 2 + pos[1];
1307         }
1308
1309         return NULL;
1310 }
1311
1312
1313 /**
1314  * wpa_scan_get_vendor_ie - Fetch vendor information element from a scan result
1315  * @res: Scan result entry
1316  * @vendor_type: Vendor type (four octets starting the IE payload)
1317  * Returns: Pointer to the information element (id field) or %NULL if not found
1318  *
1319  * This function returns the first matching information element in the scan
1320  * result.
1321  */
1322 const u8 * wpa_scan_get_vendor_ie(const struct wpa_scan_res *res,
1323                                   u32 vendor_type)
1324 {
1325         const u8 *end, *pos;
1326
1327         pos = (const u8 *) (res + 1);
1328         end = pos + res->ie_len;
1329
1330         while (pos + 1 < end) {
1331                 if (pos + 2 + pos[1] > end)
1332                         break;
1333                 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1334                     vendor_type == WPA_GET_BE32(&pos[2]))
1335                         return pos;
1336                 pos += 2 + pos[1];
1337         }
1338
1339         return NULL;
1340 }
1341
1342
1343 /**
1344  * wpa_scan_get_vendor_ie_beacon - Fetch vendor information from a scan result
1345  * @res: Scan result entry
1346  * @vendor_type: Vendor type (four octets starting the IE payload)
1347  * Returns: Pointer to the information element (id field) or %NULL if not found
1348  *
1349  * This function returns the first matching information element in the scan
1350  * result.
1351  *
1352  * This function is like wpa_scan_get_vendor_ie(), but uses IE buffer only
1353  * from Beacon frames instead of either Beacon or Probe Response frames.
1354  */
1355 const u8 * wpa_scan_get_vendor_ie_beacon(const struct wpa_scan_res *res,
1356                                          u32 vendor_type)
1357 {
1358         const u8 *end, *pos;
1359
1360         if (res->beacon_ie_len == 0)
1361                 return NULL;
1362
1363         pos = (const u8 *) (res + 1);
1364         pos += res->ie_len;
1365         end = pos + res->beacon_ie_len;
1366
1367         while (pos + 1 < end) {
1368                 if (pos + 2 + pos[1] > end)
1369                         break;
1370                 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1371                     vendor_type == WPA_GET_BE32(&pos[2]))
1372                         return pos;
1373                 pos += 2 + pos[1];
1374         }
1375
1376         return NULL;
1377 }
1378
1379
1380 /**
1381  * wpa_scan_get_vendor_ie_multi - Fetch vendor IE data from a scan result
1382  * @res: Scan result entry
1383  * @vendor_type: Vendor type (four octets starting the IE payload)
1384  * Returns: Pointer to the information element payload or %NULL if not found
1385  *
1386  * This function returns concatenated payload of possibly fragmented vendor
1387  * specific information elements in the scan result. The caller is responsible
1388  * for freeing the returned buffer.
1389  */
1390 struct wpabuf * wpa_scan_get_vendor_ie_multi(const struct wpa_scan_res *res,
1391                                              u32 vendor_type)
1392 {
1393         struct wpabuf *buf;
1394         const u8 *end, *pos;
1395
1396         buf = wpabuf_alloc(res->ie_len);
1397         if (buf == NULL)
1398                 return NULL;
1399
1400         pos = (const u8 *) (res + 1);
1401         end = pos + res->ie_len;
1402
1403         while (pos + 1 < end) {
1404                 if (pos + 2 + pos[1] > end)
1405                         break;
1406                 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1407                     vendor_type == WPA_GET_BE32(&pos[2]))
1408                         wpabuf_put_data(buf, pos + 2 + 4, pos[1] - 4);
1409                 pos += 2 + pos[1];
1410         }
1411
1412         if (wpabuf_len(buf) == 0) {
1413                 wpabuf_free(buf);
1414                 buf = NULL;
1415         }
1416
1417         return buf;
1418 }
1419
1420
1421 /*
1422  * Channels with a great SNR can operate at full rate. What is a great SNR?
1423  * This doc https://supportforums.cisco.com/docs/DOC-12954 says, "the general
1424  * rule of thumb is that any SNR above 20 is good." This one
1425  * http://www.cisco.com/en/US/tech/tk722/tk809/technologies_q_and_a_item09186a00805e9a96.shtml#qa23
1426  * recommends 25 as a minimum SNR for 54 Mbps data rate. 30 is chosen here as a
1427  * conservative value.
1428  */
1429 #define GREAT_SNR 30
1430
1431 /* Compare function for sorting scan results. Return >0 if @b is considered
1432  * better. */
1433 static int wpa_scan_result_compar(const void *a, const void *b)
1434 {
1435 #define IS_5GHZ(n) (n > 4000)
1436 #define MIN(a,b) a < b ? a : b
1437         struct wpa_scan_res **_wa = (void *) a;
1438         struct wpa_scan_res **_wb = (void *) b;
1439         struct wpa_scan_res *wa = *_wa;
1440         struct wpa_scan_res *wb = *_wb;
1441         int wpa_a, wpa_b, maxrate_a, maxrate_b;
1442         int snr_a, snr_b;
1443
1444         /* WPA/WPA2 support preferred */
1445         wpa_a = wpa_scan_get_vendor_ie(wa, WPA_IE_VENDOR_TYPE) != NULL ||
1446                 wpa_scan_get_ie(wa, WLAN_EID_RSN) != NULL;
1447         wpa_b = wpa_scan_get_vendor_ie(wb, WPA_IE_VENDOR_TYPE) != NULL ||
1448                 wpa_scan_get_ie(wb, WLAN_EID_RSN) != NULL;
1449
1450         if (wpa_b && !wpa_a)
1451                 return 1;
1452         if (!wpa_b && wpa_a)
1453                 return -1;
1454
1455         /* privacy support preferred */
1456         if ((wa->caps & IEEE80211_CAP_PRIVACY) == 0 &&
1457             (wb->caps & IEEE80211_CAP_PRIVACY))
1458                 return 1;
1459         if ((wa->caps & IEEE80211_CAP_PRIVACY) &&
1460             (wb->caps & IEEE80211_CAP_PRIVACY) == 0)
1461                 return -1;
1462
1463         if ((wa->flags & wb->flags & WPA_SCAN_LEVEL_DBM) &&
1464             !((wa->flags | wb->flags) & WPA_SCAN_NOISE_INVALID)) {
1465                 snr_a = MIN(wa->level - wa->noise, GREAT_SNR);
1466                 snr_b = MIN(wb->level - wb->noise, GREAT_SNR);
1467         } else {
1468                 /* Not suitable information to calculate SNR, so use level */
1469                 snr_a = wa->level;
1470                 snr_b = wb->level;
1471         }
1472
1473         /* best/max rate preferred if SNR close enough */
1474         if ((snr_a && snr_b && abs(snr_b - snr_a) < 5) ||
1475             (wa->qual && wb->qual && abs(wb->qual - wa->qual) < 10)) {
1476                 maxrate_a = wpa_scan_get_max_rate(wa);
1477                 maxrate_b = wpa_scan_get_max_rate(wb);
1478                 if (maxrate_a != maxrate_b)
1479                         return maxrate_b - maxrate_a;
1480                 if (IS_5GHZ(wa->freq) ^ IS_5GHZ(wb->freq))
1481                         return IS_5GHZ(wa->freq) ? -1 : 1;
1482         }
1483
1484         /* use freq for channel preference */
1485
1486         /* all things being equal, use SNR; if SNRs are
1487          * identical, use quality values since some drivers may only report
1488          * that value and leave the signal level zero */
1489         if (snr_b == snr_a)
1490                 return wb->qual - wa->qual;
1491         return snr_b - snr_a;
1492 #undef MIN
1493 #undef IS_5GHZ
1494 }
1495
1496
1497 #ifdef CONFIG_WPS
1498 /* Compare function for sorting scan results when searching a WPS AP for
1499  * provisioning. Return >0 if @b is considered better. */
1500 static int wpa_scan_result_wps_compar(const void *a, const void *b)
1501 {
1502         struct wpa_scan_res **_wa = (void *) a;
1503         struct wpa_scan_res **_wb = (void *) b;
1504         struct wpa_scan_res *wa = *_wa;
1505         struct wpa_scan_res *wb = *_wb;
1506         int uses_wps_a, uses_wps_b;
1507         struct wpabuf *wps_a, *wps_b;
1508         int res;
1509
1510         /* Optimization - check WPS IE existence before allocated memory and
1511          * doing full reassembly. */
1512         uses_wps_a = wpa_scan_get_vendor_ie(wa, WPS_IE_VENDOR_TYPE) != NULL;
1513         uses_wps_b = wpa_scan_get_vendor_ie(wb, WPS_IE_VENDOR_TYPE) != NULL;
1514         if (uses_wps_a && !uses_wps_b)
1515                 return -1;
1516         if (!uses_wps_a && uses_wps_b)
1517                 return 1;
1518
1519         if (uses_wps_a && uses_wps_b) {
1520                 wps_a = wpa_scan_get_vendor_ie_multi(wa, WPS_IE_VENDOR_TYPE);
1521                 wps_b = wpa_scan_get_vendor_ie_multi(wb, WPS_IE_VENDOR_TYPE);
1522                 res = wps_ap_priority_compar(wps_a, wps_b);
1523                 wpabuf_free(wps_a);
1524                 wpabuf_free(wps_b);
1525                 if (res)
1526                         return res;
1527         }
1528
1529         /*
1530          * Do not use current AP security policy as a sorting criteria during
1531          * WPS provisioning step since the AP may get reconfigured at the
1532          * completion of provisioning.
1533          */
1534
1535         /* all things being equal, use signal level; if signal levels are
1536          * identical, use quality values since some drivers may only report
1537          * that value and leave the signal level zero */
1538         if (wb->level == wa->level)
1539                 return wb->qual - wa->qual;
1540         return wb->level - wa->level;
1541 }
1542 #endif /* CONFIG_WPS */
1543
1544
1545 static void dump_scan_res(struct wpa_scan_results *scan_res)
1546 {
1547 #ifndef CONFIG_NO_STDOUT_DEBUG
1548         size_t i;
1549
1550         if (scan_res->res == NULL || scan_res->num == 0)
1551                 return;
1552
1553         wpa_printf(MSG_EXCESSIVE, "Sorted scan results");
1554
1555         for (i = 0; i < scan_res->num; i++) {
1556                 struct wpa_scan_res *r = scan_res->res[i];
1557                 u8 *pos;
1558                 if ((r->flags & (WPA_SCAN_LEVEL_DBM | WPA_SCAN_NOISE_INVALID))
1559                     == WPA_SCAN_LEVEL_DBM) {
1560                         int snr = r->level - r->noise;
1561                         wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d "
1562                                    "noise=%d level=%d snr=%d%s flags=0x%x "
1563                                    "age=%u",
1564                                    MAC2STR(r->bssid), r->freq, r->qual,
1565                                    r->noise, r->level, snr,
1566                                    snr >= GREAT_SNR ? "*" : "", r->flags,
1567                                    r->age);
1568                 } else {
1569                         wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d "
1570                                    "noise=%d level=%d flags=0x%x age=%u",
1571                                    MAC2STR(r->bssid), r->freq, r->qual,
1572                                    r->noise, r->level, r->flags, r->age);
1573                 }
1574                 pos = (u8 *) (r + 1);
1575                 if (r->ie_len)
1576                         wpa_hexdump(MSG_EXCESSIVE, "IEs", pos, r->ie_len);
1577                 pos += r->ie_len;
1578                 if (r->beacon_ie_len)
1579                         wpa_hexdump(MSG_EXCESSIVE, "Beacon IEs",
1580                                     pos, r->beacon_ie_len);
1581         }
1582 #endif /* CONFIG_NO_STDOUT_DEBUG */
1583 }
1584
1585
1586 /**
1587  * wpa_supplicant_filter_bssid_match - Is the specified BSSID allowed
1588  * @wpa_s: Pointer to wpa_supplicant data
1589  * @bssid: BSSID to check
1590  * Returns: 0 if the BSSID is filtered or 1 if not
1591  *
1592  * This function is used to filter out specific BSSIDs from scan reslts mainly
1593  * for testing purposes (SET bssid_filter ctrl_iface command).
1594  */
1595 int wpa_supplicant_filter_bssid_match(struct wpa_supplicant *wpa_s,
1596                                       const u8 *bssid)
1597 {
1598         size_t i;
1599
1600         if (wpa_s->bssid_filter == NULL)
1601                 return 1;
1602
1603         for (i = 0; i < wpa_s->bssid_filter_count; i++) {
1604                 if (os_memcmp(wpa_s->bssid_filter + i * ETH_ALEN, bssid,
1605                               ETH_ALEN) == 0)
1606                         return 1;
1607         }
1608
1609         return 0;
1610 }
1611
1612
1613 static void filter_scan_res(struct wpa_supplicant *wpa_s,
1614                             struct wpa_scan_results *res)
1615 {
1616         size_t i, j;
1617
1618         if (wpa_s->bssid_filter == NULL)
1619                 return;
1620
1621         for (i = 0, j = 0; i < res->num; i++) {
1622                 if (wpa_supplicant_filter_bssid_match(wpa_s,
1623                                                       res->res[i]->bssid)) {
1624                         res->res[j++] = res->res[i];
1625                 } else {
1626                         os_free(res->res[i]);
1627                         res->res[i] = NULL;
1628                 }
1629         }
1630
1631         if (res->num != j) {
1632                 wpa_printf(MSG_DEBUG, "Filtered out %d scan results",
1633                            (int) (res->num - j));
1634                 res->num = j;
1635         }
1636 }
1637
1638
1639 /**
1640  * wpa_supplicant_get_scan_results - Get scan results
1641  * @wpa_s: Pointer to wpa_supplicant data
1642  * @info: Information about what was scanned or %NULL if not available
1643  * @new_scan: Whether a new scan was performed
1644  * Returns: Scan results, %NULL on failure
1645  *
1646  * This function request the current scan results from the driver and updates
1647  * the local BSS list wpa_s->bss. The caller is responsible for freeing the
1648  * results with wpa_scan_results_free().
1649  */
1650 struct wpa_scan_results *
1651 wpa_supplicant_get_scan_results(struct wpa_supplicant *wpa_s,
1652                                 struct scan_info *info, int new_scan)
1653 {
1654         struct wpa_scan_results *scan_res;
1655         size_t i;
1656         int (*compar)(const void *, const void *) = wpa_scan_result_compar;
1657
1658         scan_res = wpa_drv_get_scan_results2(wpa_s);
1659         if (scan_res == NULL) {
1660                 wpa_dbg(wpa_s, MSG_DEBUG, "Failed to get scan results");
1661                 return NULL;
1662         }
1663         if (scan_res->fetch_time.sec == 0) {
1664                 /*
1665                  * Make sure we have a valid timestamp if the driver wrapper
1666                  * does not set this.
1667                  */
1668                 os_get_reltime(&scan_res->fetch_time);
1669         }
1670         filter_scan_res(wpa_s, scan_res);
1671
1672 #ifdef CONFIG_WPS
1673         if (wpas_wps_searching(wpa_s)) {
1674                 wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Order scan results with WPS "
1675                         "provisioning rules");
1676                 compar = wpa_scan_result_wps_compar;
1677         }
1678 #endif /* CONFIG_WPS */
1679
1680         qsort(scan_res->res, scan_res->num, sizeof(struct wpa_scan_res *),
1681               compar);
1682         dump_scan_res(scan_res);
1683
1684         wpa_bss_update_start(wpa_s);
1685         for (i = 0; i < scan_res->num; i++)
1686                 wpa_bss_update_scan_res(wpa_s, scan_res->res[i],
1687                                         &scan_res->fetch_time);
1688         wpa_bss_update_end(wpa_s, info, new_scan);
1689
1690         return scan_res;
1691 }
1692
1693
1694 /**
1695  * wpa_supplicant_update_scan_results - Update scan results from the driver
1696  * @wpa_s: Pointer to wpa_supplicant data
1697  * Returns: 0 on success, -1 on failure
1698  *
1699  * This function updates the BSS table within wpa_supplicant based on the
1700  * currently available scan results from the driver without requesting a new
1701  * scan. This is used in cases where the driver indicates an association
1702  * (including roaming within ESS) and wpa_supplicant does not yet have the
1703  * needed information to complete the connection (e.g., to perform validation
1704  * steps in 4-way handshake).
1705  */
1706 int wpa_supplicant_update_scan_results(struct wpa_supplicant *wpa_s)
1707 {
1708         struct wpa_scan_results *scan_res;
1709         scan_res = wpa_supplicant_get_scan_results(wpa_s, NULL, 0);
1710         if (scan_res == NULL)
1711                 return -1;
1712         wpa_scan_results_free(scan_res);
1713
1714         return 0;
1715 }
1716
1717
1718 /**
1719  * scan_only_handler - Reports scan results
1720  */
1721 void scan_only_handler(struct wpa_supplicant *wpa_s,
1722                        struct wpa_scan_results *scan_res)
1723 {
1724         wpa_dbg(wpa_s, MSG_DEBUG, "Scan-only results received");
1725         if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
1726             wpa_s->manual_scan_use_id && wpa_s->own_scan_running) {
1727                 wpa_msg_ctrl(wpa_s, MSG_INFO, WPA_EVENT_SCAN_RESULTS "id=%u",
1728                              wpa_s->manual_scan_id);
1729                 wpa_s->manual_scan_use_id = 0;
1730         } else {
1731                 wpa_msg_ctrl(wpa_s, MSG_INFO, WPA_EVENT_SCAN_RESULTS);
1732         }
1733         wpas_notify_scan_results(wpa_s);
1734         wpas_notify_scan_done(wpa_s, 1);
1735         if (wpa_s->scan_work) {
1736                 struct wpa_radio_work *work = wpa_s->scan_work;
1737                 wpa_s->scan_work = NULL;
1738                 radio_work_done(work);
1739         }
1740 }
1741
1742
1743 int wpas_scan_scheduled(struct wpa_supplicant *wpa_s)
1744 {
1745         return eloop_is_timeout_registered(wpa_supplicant_scan, wpa_s, NULL);
1746 }
1747
1748
1749 struct wpa_driver_scan_params *
1750 wpa_scan_clone_params(const struct wpa_driver_scan_params *src)
1751 {
1752         struct wpa_driver_scan_params *params;
1753         size_t i;
1754         u8 *n;
1755
1756         params = os_zalloc(sizeof(*params));
1757         if (params == NULL)
1758                 return NULL;
1759
1760         for (i = 0; i < src->num_ssids; i++) {
1761                 if (src->ssids[i].ssid) {
1762                         n = os_malloc(src->ssids[i].ssid_len);
1763                         if (n == NULL)
1764                                 goto failed;
1765                         os_memcpy(n, src->ssids[i].ssid,
1766                                   src->ssids[i].ssid_len);
1767                         params->ssids[i].ssid = n;
1768                         params->ssids[i].ssid_len = src->ssids[i].ssid_len;
1769                 }
1770         }
1771         params->num_ssids = src->num_ssids;
1772
1773         if (src->extra_ies) {
1774                 n = os_malloc(src->extra_ies_len);
1775                 if (n == NULL)
1776                         goto failed;
1777                 os_memcpy(n, src->extra_ies, src->extra_ies_len);
1778                 params->extra_ies = n;
1779                 params->extra_ies_len = src->extra_ies_len;
1780         }
1781
1782         if (src->freqs) {
1783                 int len = int_array_len(src->freqs);
1784                 params->freqs = os_malloc((len + 1) * sizeof(int));
1785                 if (params->freqs == NULL)
1786                         goto failed;
1787                 os_memcpy(params->freqs, src->freqs, (len + 1) * sizeof(int));
1788         }
1789
1790         if (src->filter_ssids) {
1791                 params->filter_ssids = os_malloc(sizeof(params->filter_ssids) *
1792                                                  src->num_filter_ssids);
1793                 if (params->filter_ssids == NULL)
1794                         goto failed;
1795                 os_memcpy(params->filter_ssids, src->filter_ssids,
1796                           sizeof(params->filter_ssids) * src->num_filter_ssids);
1797                 params->num_filter_ssids = src->num_filter_ssids;
1798         }
1799
1800         params->filter_rssi = src->filter_rssi;
1801         params->p2p_probe = src->p2p_probe;
1802         params->only_new_results = src->only_new_results;
1803
1804         return params;
1805
1806 failed:
1807         wpa_scan_free_params(params);
1808         return NULL;
1809 }
1810
1811
1812 void wpa_scan_free_params(struct wpa_driver_scan_params *params)
1813 {
1814         size_t i;
1815
1816         if (params == NULL)
1817                 return;
1818
1819         for (i = 0; i < params->num_ssids; i++)
1820                 os_free((u8 *) params->ssids[i].ssid);
1821         os_free((u8 *) params->extra_ies);
1822         os_free(params->freqs);
1823         os_free(params->filter_ssids);
1824         os_free(params);
1825 }