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                 return;
 528         }
 529
 530         if (wpa_s->disconnected && wpa_s->scan_req == NORMAL_SCAN_REQ) {
 531                 wpa_dbg(wpa_s, MSG_DEBUG, "Disconnected - do not scan");
 532                 wpa_supplicant_set_state(wpa_s, WPA_DISCONNECTED);
 533                 return;
 534         }
 535
 536         if (wpa_s->scanning) {
 537                 /*
 538                  * If we are already in scanning state, we shall reschedule the
 539                  * the incoming scan request.
 540                  */
 541                 wpa_dbg(wpa_s, MSG_DEBUG, "Already scanning - Reschedule the incoming scan req");
 542                 wpa_supplicant_req_scan(wpa_s, 1, 0);
 543                 return;
 544         }
 545
 546         if (wpa_s->external_scan_running) {
 547                 struct os_reltime now, diff;
 548                 os_get_reltime(&now);
 549                 os_reltime_sub(&now, &wpa_s->scan_start_time, &diff);
 550                 if (diff.sec < 30) {
 551                         wpa_dbg(wpa_s, MSG_DEBUG, "Externally triggered scan running - Reschedule the incoming scan req");
 552                         wpa_supplicant_req_scan(wpa_s, 1, 0);
 553                         return;
 554                 }
 555         }
 556
 557         if (!wpa_supplicant_enabled_networks(wpa_s) &&
 558             wpa_s->scan_req == NORMAL_SCAN_REQ) {
 559                 wpa_dbg(wpa_s, MSG_DEBUG, "No enabled networks - do not scan");
 560                 wpa_supplicant_set_state(wpa_s, WPA_INACTIVE);
 561                 return;
 562         }
 563
 564         if (wpa_s->conf->ap_scan != 0 &&
 565             (wpa_s->drv_flags & WPA_DRIVER_FLAGS_WIRED)) {
 566                 wpa_dbg(wpa_s, MSG_DEBUG, "Using wired authentication - "
 567                         "overriding ap_scan configuration");
 568                 wpa_s->conf->ap_scan = 0;
 569                 wpas_notify_ap_scan_changed(wpa_s);
 570         }
 571
 572         if (wpa_s->conf->ap_scan == 0) {
 573                 wpa_supplicant_gen_assoc_event(wpa_s);
 574                 return;
 575         }
 576
 577 #ifdef CONFIG_P2P
 578         if (wpas_p2p_in_progress(wpa_s) || wpas_wpa_is_in_progress(wpa_s, 0)) {
 579                 wpa_dbg(wpa_s, MSG_DEBUG, "Delay station mode scan while P2P operation is in progress");
 580                 wpa_supplicant_req_scan(wpa_s, 5, 0);
 581                 return;
 582         }
 583 #endif /* CONFIG_P2P */
 584
 585 #ifdef CONFIG_GAS
 586         if (gas_query_in_progress(wpa_s->gas)) {
 587                 wpa_dbg(wpa_s, MSG_DEBUG, "Delay scan while GAS query is in progress");
 588                 wpa_supplicant_req_scan(wpa_s, 1, 0);
 589                 return;
 590         }
 591 #endif /* CONFIG_GAS */
 592
 593         if (wpa_s->conf->ap_scan == 2)
 594                 max_ssids = 1;
 595         else {
 596                 max_ssids = wpa_s->max_scan_ssids;
 597                 if (max_ssids > WPAS_MAX_SCAN_SSIDS)
 598                         max_ssids = WPAS_MAX_SCAN_SSIDS;
 599         }
 600
 601         wpa_s->last_scan_req = wpa_s->scan_req;
 602         wpa_s->scan_req = NORMAL_SCAN_REQ;
 603
 604         os_memset(&params, 0, sizeof(params));
 605
 606         prev_state = wpa_s->wpa_state;
 607         if (wpa_s->wpa_state == WPA_DISCONNECTED ||
 608             wpa_s->wpa_state == WPA_INACTIVE)
 609                 wpa_supplicant_set_state(wpa_s, WPA_SCANNING);
 610
 611         /*
 612          * If autoscan has set its own scanning parameters
 613          */
 614         if (wpa_s->autoscan_params != NULL) {
 615                 scan_params = wpa_s->autoscan_params;
 616                 goto scan;
 617         }
 618
 619         if (wpa_s->last_scan_req != MANUAL_SCAN_REQ &&
 620             wpa_s->connect_without_scan) {
 621                 for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
 622                         if (ssid == wpa_s->connect_without_scan)
 623                                 break;
 624                 }
 625                 wpa_s->connect_without_scan = NULL;
 626                 if (ssid) {
 627                         wpa_printf(MSG_DEBUG, "Start a pre-selected network "
 628                                    "without scan step");
 629                         wpa_supplicant_associate(wpa_s, NULL, ssid);
 630                         return;
 631                 }
 632         }
 633
 634 #ifdef CONFIG_P2P
 635         if ((wpa_s->p2p_in_provisioning || wpa_s->show_group_started) &&
 636             wpa_s->go_params) {
 637                 wpa_printf(MSG_DEBUG, "P2P: Use specific SSID for scan during P2P group formation (p2p_in_provisioning=%d show_group_started=%d)",
 638                            wpa_s->p2p_in_provisioning,
 639                            wpa_s->show_group_started);
 640                 params.ssids[0].ssid = wpa_s->go_params->ssid;
 641                 params.ssids[0].ssid_len = wpa_s->go_params->ssid_len;
 642                 params.num_ssids = 1;
 643                 goto ssid_list_set;
 644         }
 645 #endif /* CONFIG_P2P */
 646
 647         /* Find the starting point from which to continue scanning */
 648         ssid = wpa_s->conf->ssid;
 649         if (wpa_s->prev_scan_ssid != WILDCARD_SSID_SCAN) {
 650                 while (ssid) {
 651                         if (ssid == wpa_s->prev_scan_ssid) {
 652                                 ssid = ssid->next;
 653                                 break;
 654                         }
 655                         ssid = ssid->next;
 656                 }
 657         }
 658
 659         if (wpa_s->last_scan_req != MANUAL_SCAN_REQ &&
 660             wpa_s->conf->ap_scan == 2) {
 661                 wpa_s->connect_without_scan = NULL;
 662                 wpa_s->prev_scan_wildcard = 0;
 663                 wpa_supplicant_assoc_try(wpa_s, ssid);
 664                 return;
 665         } else if (wpa_s->conf->ap_scan == 2) {
 666                 /*
 667                  * User-initiated scan request in ap_scan == 2; scan with
 668                  * wildcard SSID.
 669                  */
 670                 ssid = NULL;
 671         } else {
 672                 struct wpa_ssid *start = ssid, *tssid;
 673                 int freqs_set = 0;
 674                 if (ssid == NULL && max_ssids > 1)
 675                         ssid = wpa_s->conf->ssid;
 676                 while (ssid) {
 677                         if (!wpas_network_disabled(wpa_s, ssid) &&
 678                             ssid->scan_ssid) {
 679                                 wpa_hexdump_ascii(MSG_DEBUG, "Scan SSID",
 680                                                   ssid->ssid, ssid->ssid_len);
 681                                 params.ssids[params.num_ssids].ssid =
 682                                         ssid->ssid;
 683                                 params.ssids[params.num_ssids].ssid_len =
 684                                         ssid->ssid_len;
 685                                 params.num_ssids++;
 686                                 if (params.num_ssids + 1 >= max_ssids)
 687                                         break;
 688                         }
 689                         ssid = ssid->next;
 690                         if (ssid == start)
 691                                 break;
 692                         if (ssid == NULL && max_ssids > 1 &&
 693                             start != wpa_s->conf->ssid)
 694                                 ssid = wpa_s->conf->ssid;
 695                 }
 696
 697                 for (tssid = wpa_s->conf->ssid; tssid; tssid = tssid->next) {
 698                         if (wpas_network_disabled(wpa_s, tssid))
 699                                 continue;
 700                         if ((params.freqs || !freqs_set) && tssid->scan_freq) {
 701                                 int_array_concat(&params.freqs,
 702                                                  tssid->scan_freq);
 703                         } else {
 704                                 os_free(params.freqs);
 705                                 params.freqs = NULL;
 706                         }
 707                         freqs_set = 1;
 708                 }
 709                 int_array_sort_unique(params.freqs);
 710         }
 711
 712         if (ssid && max_ssids == 1) {
 713                 /*
 714                  * If the driver is limited to 1 SSID at a time interleave
 715                  * wildcard SSID scans with specific SSID scans to avoid
 716                  * waiting a long time for a wildcard scan.
 717                  */
 718                 if (!wpa_s->prev_scan_wildcard) {
 719                         params.ssids[0].ssid = NULL;
 720                         params.ssids[0].ssid_len = 0;
 721                         wpa_s->prev_scan_wildcard = 1;
 722                         wpa_dbg(wpa_s, MSG_DEBUG, "Starting AP scan for "
 723                                 "wildcard SSID (Interleave with specific)");
 724                 } else {
 725                         wpa_s->prev_scan_ssid = ssid;
 726                         wpa_s->prev_scan_wildcard = 0;
 727                         wpa_dbg(wpa_s, MSG_DEBUG,
 728                                 "Starting AP scan for specific SSID: %s",
 729                                 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
 730                 }
 731         } else if (ssid) {
 732                 /* max_ssids > 1 */
 733
 734                 wpa_s->prev_scan_ssid = ssid;
 735                 wpa_dbg(wpa_s, MSG_DEBUG, "Include wildcard SSID in "
 736                         "the scan request");
 737                 params.num_ssids++;
 738         } else if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
 739                    wpa_s->manual_scan_passive && params.num_ssids == 0) {
 740                 wpa_dbg(wpa_s, MSG_DEBUG, "Use passive scan based on manual request");
 741         } else {
 742                 wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
 743                 params.num_ssids++;
 744                 wpa_dbg(wpa_s, MSG_DEBUG, "Starting AP scan for wildcard "
 745                         "SSID");
 746         }
 747 #ifdef CONFIG_P2P
 748 ssid_list_set:
 749 #endif /* CONFIG_P2P */
 750
 751         wpa_supplicant_optimize_freqs(wpa_s, &params);
 752         extra_ie = wpa_supplicant_extra_ies(wpa_s);
 753
 754         if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
 755             wpa_s->manual_scan_only_new)
 756                 params.only_new_results = 1;
 757
 758         if (wpa_s->last_scan_req == MANUAL_SCAN_REQ && params.freqs == NULL &&
 759             wpa_s->manual_scan_freqs) {
 760                 wpa_dbg(wpa_s, MSG_DEBUG, "Limit manual scan to specified channels");
 761                 params.freqs = wpa_s->manual_scan_freqs;
 762                 wpa_s->manual_scan_freqs = NULL;
 763         }
 764
 765         if (params.freqs == NULL && wpa_s->next_scan_freqs) {
 766                 wpa_dbg(wpa_s, MSG_DEBUG, "Optimize scan based on previously "
 767                         "generated frequency list");
 768                 params.freqs = wpa_s->next_scan_freqs;
 769         } else
 770                 os_free(wpa_s->next_scan_freqs);
 771         wpa_s->next_scan_freqs = NULL;
 772         wpa_setband_scan_freqs(wpa_s, &params);
 773
 774         /* See if user specified frequencies. If so, scan only those. */
 775         if (wpa_s->conf->freq_list && !params.freqs) {
 776                 wpa_dbg(wpa_s, MSG_DEBUG,
 777                         "Optimize scan based on conf->freq_list");
 778                 int_array_concat(&params.freqs, wpa_s->conf->freq_list);
 779         }
 780
 781         /* Use current associated channel? */
 782         if (wpa_s->conf->scan_cur_freq && !params.freqs) {
 783                 unsigned int num = wpa_s->num_multichan_concurrent;
 784
 785                 params.freqs = os_calloc(num + 1, sizeof(int));
 786                 if (params.freqs) {
 787                         num = get_shared_radio_freqs(wpa_s, params.freqs, num);
 788                         if (num > 0) {
 789                                 wpa_dbg(wpa_s, MSG_DEBUG, "Scan only the "
 790                                         "current operating channels since "
 791                                         "scan_cur_freq is enabled");
 792                         } else {
 793                                 os_free(params.freqs);
 794                                 params.freqs = NULL;
 795                         }
 796                 }
 797         }
 798
 799         params.filter_ssids = wpa_supplicant_build_filter_ssids(
 800                 wpa_s->conf, &params.num_filter_ssids);
 801         if (extra_ie) {
 802                 params.extra_ies = wpabuf_head(extra_ie);
 803                 params.extra_ies_len = wpabuf_len(extra_ie);
 804         }
 805
 806 #ifdef CONFIG_P2P
 807         if (wpa_s->p2p_in_provisioning ||
 808             (wpa_s->show_group_started && wpa_s->go_params)) {
 809                 /*
 810                  * The interface may not yet be in P2P mode, so we have to
 811                  * explicitly request P2P probe to disable CCK rates.
 812                  */
 813                 params.p2p_probe = 1;
 814         }
 815 #endif /* CONFIG_P2P */
 816
 817         scan_params = &params;
 818
 819 scan:
 820 #ifdef CONFIG_P2P
 821         /*
 822          * If the driver does not support multi-channel concurrency and a
 823          * virtual interface that shares the same radio with the wpa_s interface
 824          * is operating there may not be need to scan other channels apart from
 825          * the current operating channel on the other virtual interface. Filter
 826          * out other channels in case we are trying to find a connection for a
 827          * station interface when we are not configured to prefer station
 828          * connection and a concurrent operation is already in process.
 829          */
 830         if (wpa_s->scan_for_connection &&
 831             wpa_s->last_scan_req == NORMAL_SCAN_REQ &&
 832             !scan_params->freqs && !params.freqs &&
 833             wpas_is_p2p_prioritized(wpa_s) &&
 834             wpa_s->p2p_group_interface == NOT_P2P_GROUP_INTERFACE &&
 835             non_p2p_network_enabled(wpa_s)) {
 836                 unsigned int num = wpa_s->num_multichan_concurrent;
 837
 838                 params.freqs = os_calloc(num + 1, sizeof(int));
 839                 if (params.freqs) {
 840                         num = get_shared_radio_freqs(wpa_s, params.freqs, num);
 841                         if (num > 0 && num == wpa_s->num_multichan_concurrent) {
 842                                 wpa_dbg(wpa_s, MSG_DEBUG, "Scan only the current operating channels since all channels are already used");
 843                         } else {
 844                                 os_free(params.freqs);
 845                                 params.freqs = NULL;
 846                         }
 847                 }
 848         }
 849 #endif /* CONFIG_P2P */
 850
 851         ret = wpa_supplicant_trigger_scan(wpa_s, scan_params);
 852
 853         if (ret && wpa_s->last_scan_req == MANUAL_SCAN_REQ && params.freqs &&
 854             !wpa_s->manual_scan_freqs) {
 855                 /* Restore manual_scan_freqs for the next attempt */
 856                 wpa_s->manual_scan_freqs = params.freqs;
 857                 params.freqs = NULL;
 858         }
 859
 860         wpabuf_free(extra_ie);
 861         os_free(params.freqs);
 862         os_free(params.filter_ssids);
 863
 864         if (ret) {
 865                 wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate AP scan");
 866                 if (prev_state != wpa_s->wpa_state)
 867                         wpa_supplicant_set_state(wpa_s, prev_state);
 868                 /* Restore scan_req since we will try to scan again */
 869                 wpa_s->scan_req = wpa_s->last_scan_req;
 870                 wpa_supplicant_req_scan(wpa_s, 1, 0);
 871         } else {
 872                 wpa_s->scan_for_connection = 0;
 873         }
 874 }
 875
 876
 877 void wpa_supplicant_update_scan_int(struct wpa_supplicant *wpa_s, int sec)
 878 {
 879         struct os_reltime remaining, new_int;
 880         int cancelled;
 881
 882         cancelled = eloop_cancel_timeout_one(wpa_supplicant_scan, wpa_s, NULL,
 883                                              &remaining);
 884
 885         new_int.sec = sec;
 886         new_int.usec = 0;
 887         if (cancelled && os_reltime_before(&remaining, &new_int)) {
 888                 new_int.sec = remaining.sec;
 889                 new_int.usec = remaining.usec;
 890         }
 891
 892         if (cancelled) {
 893                 eloop_register_timeout(new_int.sec, new_int.usec,
 894                                        wpa_supplicant_scan, wpa_s, NULL);
 895         }
 896         wpa_s->scan_interval = sec;
 897 }
 898
 899
 900 /**
 901  * wpa_supplicant_req_scan - Schedule a scan for neighboring access points
 902  * @wpa_s: Pointer to wpa_supplicant data
 903  * @sec: Number of seconds after which to scan
 904  * @usec: Number of microseconds after which to scan
 905  *
 906  * This function is used to schedule a scan for neighboring access points after
 907  * the specified time.
 908  */
 909 void wpa_supplicant_req_scan(struct wpa_supplicant *wpa_s, int sec, int usec)
 910 {
 911         if (eloop_deplete_timeout(sec, usec, wpa_supplicant_scan, wpa_s, NULL))
 912         {
 913                 wpa_dbg(wpa_s, MSG_DEBUG, "Rescheduling scan request: %d sec %d usec",
 914                         sec, usec);
 915                 return;
 916         }
 917
 918         wpa_dbg(wpa_s, MSG_DEBUG, "Setting scan request: %d sec %d usec",
 919                 sec, usec);
 920         eloop_cancel_timeout(wpa_supplicant_scan, wpa_s, NULL);
 921         eloop_register_timeout(sec, usec, wpa_supplicant_scan, wpa_s, NULL);
 922 }
 923
 924
 925 /**
 926  * wpa_supplicant_delayed_sched_scan - Request a delayed scheduled scan
 927  * @wpa_s: Pointer to wpa_supplicant data
 928  * @sec: Number of seconds after which to scan
 929  * @usec: Number of microseconds after which to scan
 930  * Returns: 0 on success or -1 otherwise
 931  *
 932  * This function is used to schedule periodic scans for neighboring
 933  * access points after the specified time.
 934  */
 935 int wpa_supplicant_delayed_sched_scan(struct wpa_supplicant *wpa_s,
 936                                       int sec, int usec)
 937 {
 938         if (!wpa_s->sched_scan_supported)
 939                 return -1;
 940
 941         eloop_register_timeout(sec, usec,
 942                                wpa_supplicant_delayed_sched_scan_timeout,
 943                                wpa_s, NULL);
 944
 945         return 0;
 946 }
 947
 948
 949 /**
 950  * wpa_supplicant_req_sched_scan - Start a periodic scheduled scan
 951  * @wpa_s: Pointer to wpa_supplicant data
 952  * Returns: 0 is sched_scan was started or -1 otherwise
 953  *
 954  * This function is used to schedule periodic scans for neighboring
 955  * access points repeating the scan continuously.
 956  */
 957 int wpa_supplicant_req_sched_scan(struct wpa_supplicant *wpa_s)
 958 {
 959         struct wpa_driver_scan_params params;
 960         struct wpa_driver_scan_params *scan_params;
 961         enum wpa_states prev_state;
 962         struct wpa_ssid *ssid = NULL;
 963         struct wpabuf *extra_ie = NULL;
 964         int ret;
 965         unsigned int max_sched_scan_ssids;
 966         int wildcard = 0;
 967         int need_ssids;
 968
 969         if (!wpa_s->sched_scan_supported)
 970                 return -1;
 971
 972         if (wpa_s->max_sched_scan_ssids > WPAS_MAX_SCAN_SSIDS)
 973                 max_sched_scan_ssids = WPAS_MAX_SCAN_SSIDS;
 974         else
 975                 max_sched_scan_ssids = wpa_s->max_sched_scan_ssids;
 976         if (max_sched_scan_ssids < 1 || wpa_s->conf->disable_scan_offload)
 977                 return -1;
 978
 979         if (wpa_s->sched_scanning) {
 980                 wpa_dbg(wpa_s, MSG_DEBUG, "Already sched scanning");
 981                 return 0;
 982         }
 983
 984         need_ssids = 0;
 985         for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
 986                 if (!wpas_network_disabled(wpa_s, ssid) && !ssid->scan_ssid) {
 987                         /* Use wildcard SSID to find this network */
 988                         wildcard = 1;
 989                 } else if (!wpas_network_disabled(wpa_s, ssid) &&
 990                            ssid->ssid_len)
 991                         need_ssids++;
 992
 993 #ifdef CONFIG_WPS
 994                 if (!wpas_network_disabled(wpa_s, ssid) &&
 995                     ssid->key_mgmt == WPA_KEY_MGMT_WPS) {
 996                         /*
 997                          * Normal scan is more reliable and faster for WPS
 998                          * operations and since these are for short periods of
 999                          * time, the benefit of trying to use sched_scan would
1000                          * be limited.
1001                          */
1002                         wpa_dbg(wpa_s, MSG_DEBUG, "Use normal scan instead of "
1003                                 "sched_scan for WPS");
1004                         return -1;
1005                 }
1006 #endif /* CONFIG_WPS */
1007         }
1008         if (wildcard)
1009                 need_ssids++;
1010
1011         if (wpa_s->normal_scans < 3 &&
1012             (need_ssids <= wpa_s->max_scan_ssids ||
1013              wpa_s->max_scan_ssids >= (int) max_sched_scan_ssids)) {
1014                 /*
1015                  * When normal scan can speed up operations, use that for the
1016                  * first operations before starting the sched_scan to allow
1017                  * user space sleep more. We do this only if the normal scan
1018                  * has functionality that is suitable for this or if the
1019                  * sched_scan does not have better support for multiple SSIDs.
1020                  */
1021                 wpa_dbg(wpa_s, MSG_DEBUG, "Use normal scan instead of "
1022                         "sched_scan for initial scans (normal_scans=%d)",
1023                         wpa_s->normal_scans);
1024                 return -1;
1025         }
1026
1027         os_memset(&params, 0, sizeof(params));
1028
1029         /* If we can't allocate space for the filters, we just don't filter */
1030         params.filter_ssids = os_zalloc(wpa_s->max_match_sets *
1031                                         sizeof(struct wpa_driver_scan_filter));
1032
1033         prev_state = wpa_s->wpa_state;
1034         if (wpa_s->wpa_state == WPA_DISCONNECTED ||
1035             wpa_s->wpa_state == WPA_INACTIVE)
1036                 wpa_supplicant_set_state(wpa_s, WPA_SCANNING);
1037
1038         if (wpa_s->autoscan_params != NULL) {
1039                 scan_params = wpa_s->autoscan_params;
1040                 goto scan;
1041         }
1042
1043         /* Find the starting point from which to continue scanning */
1044         ssid = wpa_s->conf->ssid;
1045         if (wpa_s->prev_sched_ssid) {
1046                 while (ssid) {
1047                         if (ssid == wpa_s->prev_sched_ssid) {
1048                                 ssid = ssid->next;
1049                                 break;
1050                         }
1051                         ssid = ssid->next;
1052                 }
1053         }
1054
1055         if (!ssid || !wpa_s->prev_sched_ssid) {
1056                 wpa_dbg(wpa_s, MSG_DEBUG, "Beginning of SSID list");
1057                 if (wpa_s->conf->sched_scan_interval)
1058                         wpa_s->sched_scan_interval =
1059                                 wpa_s->conf->sched_scan_interval;
1060                 if (wpa_s->sched_scan_interval == 0)
1061                         wpa_s->sched_scan_interval = 10;
1062                 wpa_s->sched_scan_timeout = max_sched_scan_ssids * 2;
1063                 wpa_s->first_sched_scan = 1;
1064                 ssid = wpa_s->conf->ssid;
1065                 wpa_s->prev_sched_ssid = ssid;
1066         }
1067
1068         if (wildcard) {
1069                 wpa_dbg(wpa_s, MSG_DEBUG, "Add wildcard SSID to sched_scan");
1070                 params.num_ssids++;
1071         }
1072
1073         while (ssid) {
1074                 if (wpas_network_disabled(wpa_s, ssid))
1075                         goto next;
1076
1077                 if (params.num_filter_ssids < wpa_s->max_match_sets &&
1078                     params.filter_ssids && ssid->ssid && ssid->ssid_len) {
1079                         wpa_dbg(wpa_s, MSG_DEBUG, "add to filter ssid: %s",
1080                                 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
1081                         os_memcpy(params.filter_ssids[params.num_filter_ssids].ssid,
1082                                   ssid->ssid, ssid->ssid_len);
1083                         params.filter_ssids[params.num_filter_ssids].ssid_len =
1084                                 ssid->ssid_len;
1085                         params.num_filter_ssids++;
1086                 } else if (params.filter_ssids && ssid->ssid && ssid->ssid_len)
1087                 {
1088                         wpa_dbg(wpa_s, MSG_DEBUG, "Not enough room for SSID "
1089                                 "filter for sched_scan - drop filter");
1090                         os_free(params.filter_ssids);
1091                         params.filter_ssids = NULL;
1092                         params.num_filter_ssids = 0;
1093                 }
1094
1095                 if (ssid->scan_ssid && ssid->ssid && ssid->ssid_len) {
1096                         if (params.num_ssids == max_sched_scan_ssids)
1097                                 break; /* only room for broadcast SSID */
1098                         wpa_dbg(wpa_s, MSG_DEBUG,
1099                                 "add to active scan ssid: %s",
1100                                 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
1101                         params.ssids[params.num_ssids].ssid =
1102                                 ssid->ssid;
1103                         params.ssids[params.num_ssids].ssid_len =
1104                                 ssid->ssid_len;
1105                         params.num_ssids++;
1106                         if (params.num_ssids >= max_sched_scan_ssids) {
1107                                 wpa_s->prev_sched_ssid = ssid;
1108                                 do {
1109                                         ssid = ssid->next;
1110                                 } while (ssid &&
1111                                          (wpas_network_disabled(wpa_s, ssid) ||
1112                                           !ssid->scan_ssid));
1113                                 break;
1114                         }
1115                 }
1116
1117         next:
1118                 wpa_s->prev_sched_ssid = ssid;
1119                 ssid = ssid->next;
1120         }
1121
1122         if (params.num_filter_ssids == 0) {
1123                 os_free(params.filter_ssids);
1124                 params.filter_ssids = NULL;
1125         }
1126
1127         extra_ie = wpa_supplicant_extra_ies(wpa_s);
1128         if (extra_ie) {
1129                 params.extra_ies = wpabuf_head(extra_ie);
1130                 params.extra_ies_len = wpabuf_len(extra_ie);
1131         }
1132
1133         scan_params = &params;
1134
1135 scan:
1136         if (ssid || !wpa_s->first_sched_scan) {
1137                 wpa_dbg(wpa_s, MSG_DEBUG,
1138                         "Starting sched scan: interval %d timeout %d",
1139                         wpa_s->sched_scan_interval, wpa_s->sched_scan_timeout);
1140         } else {
1141                 wpa_dbg(wpa_s, MSG_DEBUG,
1142                         "Starting sched scan: interval %d (no timeout)",
1143                         wpa_s->sched_scan_interval);
1144         }
1145
1146         wpa_setband_scan_freqs(wpa_s, scan_params);
1147
1148         ret = wpa_supplicant_start_sched_scan(wpa_s, scan_params,
1149                                               wpa_s->sched_scan_interval);
1150         wpabuf_free(extra_ie);
1151         os_free(params.filter_ssids);
1152         if (ret) {
1153                 wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate sched scan");
1154                 if (prev_state != wpa_s->wpa_state)
1155                         wpa_supplicant_set_state(wpa_s, prev_state);
1156                 return ret;
1157         }
1158
1159         /* If we have more SSIDs to scan, add a timeout so we scan them too */
1160         if (ssid || !wpa_s->first_sched_scan) {
1161                 wpa_s->sched_scan_timed_out = 0;
1162                 eloop_register_timeout(wpa_s->sched_scan_timeout, 0,
1163                                        wpa_supplicant_sched_scan_timeout,
1164                                        wpa_s, NULL);
1165                 wpa_s->first_sched_scan = 0;
1166                 wpa_s->sched_scan_timeout /= 2;
1167                 wpa_s->sched_scan_interval *= 2;
1168                 if (wpa_s->sched_scan_timeout < wpa_s->sched_scan_interval) {
1169                         wpa_s->sched_scan_interval = 10;
1170                         wpa_s->sched_scan_timeout = max_sched_scan_ssids * 2;
1171                 }
1172         }
1173
1174         /* If there is no more ssids, start next time from the beginning */
1175         if (!ssid)
1176                 wpa_s->prev_sched_ssid = NULL;
1177
1178         return 0;
1179 }
1180
1181
1182 /**
1183  * wpa_supplicant_cancel_scan - Cancel a scheduled scan request
1184  * @wpa_s: Pointer to wpa_supplicant data
1185  *
1186  * This function is used to cancel a scan request scheduled with
1187  * wpa_supplicant_req_scan().
1188  */
1189 void wpa_supplicant_cancel_scan(struct wpa_supplicant *wpa_s)
1190 {
1191         wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling scan request");
1192         eloop_cancel_timeout(wpa_supplicant_scan, wpa_s, NULL);
1193 }
1194
1195
1196 /**
1197  * wpa_supplicant_cancel_delayed_sched_scan - Stop a delayed scheduled scan
1198  * @wpa_s: Pointer to wpa_supplicant data
1199  *
1200  * This function is used to stop a delayed scheduled scan.
1201  */
1202 void wpa_supplicant_cancel_delayed_sched_scan(struct wpa_supplicant *wpa_s)
1203 {
1204         if (!wpa_s->sched_scan_supported)
1205                 return;
1206
1207         wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling delayed sched scan");
1208         eloop_cancel_timeout(wpa_supplicant_delayed_sched_scan_timeout,
1209                              wpa_s, NULL);
1210 }
1211
1212
1213 /**
1214  * wpa_supplicant_cancel_sched_scan - Stop running scheduled scans
1215  * @wpa_s: Pointer to wpa_supplicant data
1216  *
1217  * This function is used to stop a periodic scheduled scan.
1218  */
1219 void wpa_supplicant_cancel_sched_scan(struct wpa_supplicant *wpa_s)
1220 {
1221         if (!wpa_s->sched_scanning)
1222                 return;
1223
1224         wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling sched scan");
1225         eloop_cancel_timeout(wpa_supplicant_sched_scan_timeout, wpa_s, NULL);
1226         wpa_supplicant_stop_sched_scan(wpa_s);
1227 }
1228
1229
1230 /**
1231  * wpa_supplicant_notify_scanning - Indicate possible scan state change
1232  * @wpa_s: Pointer to wpa_supplicant data
1233  * @scanning: Whether scanning is currently in progress
1234  *
1235  * This function is to generate scanning notifycations. It is called whenever
1236  * there may have been a change in scanning (scan started, completed, stopped).
1237  * wpas_notify_scanning() is called whenever the scanning state changed from the
1238  * previously notified state.
1239  */
1240 void wpa_supplicant_notify_scanning(struct wpa_supplicant *wpa_s,
1241                                     int scanning)
1242 {
1243         if (wpa_s->scanning != scanning) {
1244                 wpa_s->scanning = scanning;
1245                 wpas_notify_scanning(wpa_s);
1246         }
1247 }
1248
1249
1250 static int wpa_scan_get_max_rate(const struct wpa_scan_res *res)
1251 {
1252         int rate = 0;
1253         const u8 *ie;
1254         int i;
1255
1256         ie = wpa_scan_get_ie(res, WLAN_EID_SUPP_RATES);
1257         for (i = 0; ie && i < ie[1]; i++) {
1258                 if ((ie[i + 2] & 0x7f) > rate)
1259                         rate = ie[i + 2] & 0x7f;
1260         }
1261
1262         ie = wpa_scan_get_ie(res, WLAN_EID_EXT_SUPP_RATES);
1263         for (i = 0; ie && i < ie[1]; i++) {
1264                 if ((ie[i + 2] & 0x7f) > rate)
1265                         rate = ie[i + 2] & 0x7f;
1266         }
1267
1268         return rate;
1269 }
1270
1271
1272 /**
1273  * wpa_scan_get_ie - Fetch a specified information element from a scan result
1274  * @res: Scan result entry
1275  * @ie: Information element identitifier (WLAN_EID_*)
1276  * Returns: Pointer to the information element (id field) or %NULL if not found
1277  *
1278  * This function returns the first matching information element in the scan
1279  * result.
1280  */
1281 const u8 * wpa_scan_get_ie(const struct wpa_scan_res *res, u8 ie)
1282 {
1283         const u8 *end, *pos;
1284
1285         pos = (const u8 *) (res + 1);
1286         end = pos + res->ie_len;
1287
1288         while (pos + 1 < end) {
1289                 if (pos + 2 + pos[1] > end)
1290                         break;
1291                 if (pos[0] == ie)
1292                         return pos;
1293                 pos += 2 + pos[1];
1294         }
1295
1296         return NULL;
1297 }
1298
1299
1300 /**
1301  * wpa_scan_get_vendor_ie - Fetch vendor information element from a scan result
1302  * @res: Scan result entry
1303  * @vendor_type: Vendor type (four octets starting the IE payload)
1304  * Returns: Pointer to the information element (id field) or %NULL if not found
1305  *
1306  * This function returns the first matching information element in the scan
1307  * result.
1308  */
1309 const u8 * wpa_scan_get_vendor_ie(const struct wpa_scan_res *res,
1310                                   u32 vendor_type)
1311 {
1312         const u8 *end, *pos;
1313
1314         pos = (const u8 *) (res + 1);
1315         end = pos + res->ie_len;
1316
1317         while (pos + 1 < end) {
1318                 if (pos + 2 + pos[1] > end)
1319                         break;
1320                 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1321                     vendor_type == WPA_GET_BE32(&pos[2]))
1322                         return pos;
1323                 pos += 2 + pos[1];
1324         }
1325
1326         return NULL;
1327 }
1328
1329
1330 /**
1331  * wpa_scan_get_vendor_ie_beacon - Fetch vendor information from a scan result
1332  * @res: Scan result entry
1333  * @vendor_type: Vendor type (four octets starting the IE payload)
1334  * Returns: Pointer to the information element (id field) or %NULL if not found
1335  *
1336  * This function returns the first matching information element in the scan
1337  * result.
1338  *
1339  * This function is like wpa_scan_get_vendor_ie(), but uses IE buffer only
1340  * from Beacon frames instead of either Beacon or Probe Response frames.
1341  */
1342 const u8 * wpa_scan_get_vendor_ie_beacon(const struct wpa_scan_res *res,
1343                                          u32 vendor_type)
1344 {
1345         const u8 *end, *pos;
1346
1347         if (res->beacon_ie_len == 0)
1348                 return NULL;
1349
1350         pos = (const u8 *) (res + 1);
1351         pos += res->ie_len;
1352         end = pos + res->beacon_ie_len;
1353
1354         while (pos + 1 < end) {
1355                 if (pos + 2 + pos[1] > end)
1356                         break;
1357                 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1358                     vendor_type == WPA_GET_BE32(&pos[2]))
1359                         return pos;
1360                 pos += 2 + pos[1];
1361         }
1362
1363         return NULL;
1364 }
1365
1366
1367 /**
1368  * wpa_scan_get_vendor_ie_multi - Fetch vendor IE data from a scan result
1369  * @res: Scan result entry
1370  * @vendor_type: Vendor type (four octets starting the IE payload)
1371  * Returns: Pointer to the information element payload or %NULL if not found
1372  *
1373  * This function returns concatenated payload of possibly fragmented vendor
1374  * specific information elements in the scan result. The caller is responsible
1375  * for freeing the returned buffer.
1376  */
1377 struct wpabuf * wpa_scan_get_vendor_ie_multi(const struct wpa_scan_res *res,
1378                                              u32 vendor_type)
1379 {
1380         struct wpabuf *buf;
1381         const u8 *end, *pos;
1382
1383         buf = wpabuf_alloc(res->ie_len);
1384         if (buf == NULL)
1385                 return NULL;
1386
1387         pos = (const u8 *) (res + 1);
1388         end = pos + res->ie_len;
1389
1390         while (pos + 1 < end) {
1391                 if (pos + 2 + pos[1] > end)
1392                         break;
1393                 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1394                     vendor_type == WPA_GET_BE32(&pos[2]))
1395                         wpabuf_put_data(buf, pos + 2 + 4, pos[1] - 4);
1396                 pos += 2 + pos[1];
1397         }
1398
1399         if (wpabuf_len(buf) == 0) {
1400                 wpabuf_free(buf);
1401                 buf = NULL;
1402         }
1403
1404         return buf;
1405 }
1406
1407
1408 /*
1409  * Channels with a great SNR can operate at full rate. What is a great SNR?
1410  * This doc https://supportforums.cisco.com/docs/DOC-12954 says, "the general
1411  * rule of thumb is that any SNR above 20 is good." This one
1412  * http://www.cisco.com/en/US/tech/tk722/tk809/technologies_q_and_a_item09186a00805e9a96.shtml#qa23
1413  * recommends 25 as a minimum SNR for 54 Mbps data rate. 30 is chosen here as a
1414  * conservative value.
1415  */
1416 #define GREAT_SNR 30
1417
1418 /* Compare function for sorting scan results. Return >0 if @b is considered
1419  * better. */
1420 static int wpa_scan_result_compar(const void *a, const void *b)
1421 {
1422 #define IS_5GHZ(n) (n > 4000)
1423 #define MIN(a,b) a < b ? a : b
1424         struct wpa_scan_res **_wa = (void *) a;
1425         struct wpa_scan_res **_wb = (void *) b;
1426         struct wpa_scan_res *wa = *_wa;
1427         struct wpa_scan_res *wb = *_wb;
1428         int wpa_a, wpa_b, maxrate_a, maxrate_b;
1429         int snr_a, snr_b;
1430
1431         /* WPA/WPA2 support preferred */
1432         wpa_a = wpa_scan_get_vendor_ie(wa, WPA_IE_VENDOR_TYPE) != NULL ||
1433                 wpa_scan_get_ie(wa, WLAN_EID_RSN) != NULL;
1434         wpa_b = wpa_scan_get_vendor_ie(wb, WPA_IE_VENDOR_TYPE) != NULL ||
1435                 wpa_scan_get_ie(wb, WLAN_EID_RSN) != NULL;
1436
1437         if (wpa_b && !wpa_a)
1438                 return 1;
1439         if (!wpa_b && wpa_a)
1440                 return -1;
1441
1442         /* privacy support preferred */
1443         if ((wa->caps & IEEE80211_CAP_PRIVACY) == 0 &&
1444             (wb->caps & IEEE80211_CAP_PRIVACY))
1445                 return 1;
1446         if ((wa->caps & IEEE80211_CAP_PRIVACY) &&
1447             (wb->caps & IEEE80211_CAP_PRIVACY) == 0)
1448                 return -1;
1449
1450         if ((wa->flags & wb->flags & WPA_SCAN_LEVEL_DBM) &&
1451             !((wa->flags | wb->flags) & WPA_SCAN_NOISE_INVALID)) {
1452                 snr_a = MIN(wa->level - wa->noise, GREAT_SNR);
1453                 snr_b = MIN(wb->level - wb->noise, GREAT_SNR);
1454         } else {
1455                 /* Not suitable information to calculate SNR, so use level */
1456                 snr_a = wa->level;
1457                 snr_b = wb->level;
1458         }
1459
1460         /* best/max rate preferred if SNR close enough */
1461         if ((snr_a && snr_b && abs(snr_b - snr_a) < 5) ||
1462             (wa->qual && wb->qual && abs(wb->qual - wa->qual) < 10)) {
1463                 maxrate_a = wpa_scan_get_max_rate(wa);
1464                 maxrate_b = wpa_scan_get_max_rate(wb);
1465                 if (maxrate_a != maxrate_b)
1466                         return maxrate_b - maxrate_a;
1467                 if (IS_5GHZ(wa->freq) ^ IS_5GHZ(wb->freq))
1468                         return IS_5GHZ(wa->freq) ? -1 : 1;
1469         }
1470
1471         /* use freq for channel preference */
1472
1473         /* all things being equal, use SNR; if SNRs are
1474          * identical, use quality values since some drivers may only report
1475          * that value and leave the signal level zero */
1476         if (snr_b == snr_a)
1477                 return wb->qual - wa->qual;
1478         return snr_b - snr_a;
1479 #undef MIN
1480 #undef IS_5GHZ
1481 }
1482
1483
1484 #ifdef CONFIG_WPS
1485 /* Compare function for sorting scan results when searching a WPS AP for
1486  * provisioning. Return >0 if @b is considered better. */
1487 static int wpa_scan_result_wps_compar(const void *a, const void *b)
1488 {
1489         struct wpa_scan_res **_wa = (void *) a;
1490         struct wpa_scan_res **_wb = (void *) b;
1491         struct wpa_scan_res *wa = *_wa;
1492         struct wpa_scan_res *wb = *_wb;
1493         int uses_wps_a, uses_wps_b;
1494         struct wpabuf *wps_a, *wps_b;
1495         int res;
1496
1497         /* Optimization - check WPS IE existence before allocated memory and
1498          * doing full reassembly. */
1499         uses_wps_a = wpa_scan_get_vendor_ie(wa, WPS_IE_VENDOR_TYPE) != NULL;
1500         uses_wps_b = wpa_scan_get_vendor_ie(wb, WPS_IE_VENDOR_TYPE) != NULL;
1501         if (uses_wps_a && !uses_wps_b)
1502                 return -1;
1503         if (!uses_wps_a && uses_wps_b)
1504                 return 1;
1505
1506         if (uses_wps_a && uses_wps_b) {
1507                 wps_a = wpa_scan_get_vendor_ie_multi(wa, WPS_IE_VENDOR_TYPE);
1508                 wps_b = wpa_scan_get_vendor_ie_multi(wb, WPS_IE_VENDOR_TYPE);
1509                 res = wps_ap_priority_compar(wps_a, wps_b);
1510                 wpabuf_free(wps_a);
1511                 wpabuf_free(wps_b);
1512                 if (res)
1513                         return res;
1514         }
1515
1516         /*
1517          * Do not use current AP security policy as a sorting criteria during
1518          * WPS provisioning step since the AP may get reconfigured at the
1519          * completion of provisioning.
1520          */
1521
1522         /* all things being equal, use signal level; if signal levels are
1523          * identical, use quality values since some drivers may only report
1524          * that value and leave the signal level zero */
1525         if (wb->level == wa->level)
1526                 return wb->qual - wa->qual;
1527         return wb->level - wa->level;
1528 }
1529 #endif /* CONFIG_WPS */
1530
1531
1532 static void dump_scan_res(struct wpa_scan_results *scan_res)
1533 {
1534 #ifndef CONFIG_NO_STDOUT_DEBUG
1535         size_t i;
1536
1537         if (scan_res->res == NULL || scan_res->num == 0)
1538                 return;
1539
1540         wpa_printf(MSG_EXCESSIVE, "Sorted scan results");
1541
1542         for (i = 0; i < scan_res->num; i++) {
1543                 struct wpa_scan_res *r = scan_res->res[i];
1544                 u8 *pos;
1545                 if ((r->flags & (WPA_SCAN_LEVEL_DBM | WPA_SCAN_NOISE_INVALID))
1546                     == WPA_SCAN_LEVEL_DBM) {
1547                         int snr = r->level - r->noise;
1548                         wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d "
1549                                    "noise=%d level=%d snr=%d%s flags=0x%x "
1550                                    "age=%u",
1551                                    MAC2STR(r->bssid), r->freq, r->qual,
1552                                    r->noise, r->level, snr,
1553                                    snr >= GREAT_SNR ? "*" : "", r->flags,
1554                                    r->age);
1555                 } else {
1556                         wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d "
1557                                    "noise=%d level=%d flags=0x%x age=%u",
1558                                    MAC2STR(r->bssid), r->freq, r->qual,
1559                                    r->noise, r->level, r->flags, r->age);
1560                 }
1561                 pos = (u8 *) (r + 1);
1562                 if (r->ie_len)
1563                         wpa_hexdump(MSG_EXCESSIVE, "IEs", pos, r->ie_len);
1564                 pos += r->ie_len;
1565                 if (r->beacon_ie_len)
1566                         wpa_hexdump(MSG_EXCESSIVE, "Beacon IEs",
1567                                     pos, r->beacon_ie_len);
1568         }
1569 #endif /* CONFIG_NO_STDOUT_DEBUG */
1570 }
1571
1572
1573 /**
1574  * wpa_supplicant_filter_bssid_match - Is the specified BSSID allowed
1575  * @wpa_s: Pointer to wpa_supplicant data
1576  * @bssid: BSSID to check
1577  * Returns: 0 if the BSSID is filtered or 1 if not
1578  *
1579  * This function is used to filter out specific BSSIDs from scan reslts mainly
1580  * for testing purposes (SET bssid_filter ctrl_iface command).
1581  */
1582 int wpa_supplicant_filter_bssid_match(struct wpa_supplicant *wpa_s,
1583                                       const u8 *bssid)
1584 {
1585         size_t i;
1586
1587         if (wpa_s->bssid_filter == NULL)
1588                 return 1;
1589
1590         for (i = 0; i < wpa_s->bssid_filter_count; i++) {
1591                 if (os_memcmp(wpa_s->bssid_filter + i * ETH_ALEN, bssid,
1592                               ETH_ALEN) == 0)
1593                         return 1;
1594         }
1595
1596         return 0;
1597 }
1598
1599
1600 static void filter_scan_res(struct wpa_supplicant *wpa_s,
1601                             struct wpa_scan_results *res)
1602 {
1603         size_t i, j;
1604
1605         if (wpa_s->bssid_filter == NULL)
1606                 return;
1607
1608         for (i = 0, j = 0; i < res->num; i++) {
1609                 if (wpa_supplicant_filter_bssid_match(wpa_s,
1610                                                       res->res[i]->bssid)) {
1611                         res->res[j++] = res->res[i];
1612                 } else {
1613                         os_free(res->res[i]);
1614                         res->res[i] = NULL;
1615                 }
1616         }
1617
1618         if (res->num != j) {
1619                 wpa_printf(MSG_DEBUG, "Filtered out %d scan results",
1620                            (int) (res->num - j));
1621                 res->num = j;
1622         }
1623 }
1624
1625
1626 /**
1627  * wpa_supplicant_get_scan_results - Get scan results
1628  * @wpa_s: Pointer to wpa_supplicant data
1629  * @info: Information about what was scanned or %NULL if not available
1630  * @new_scan: Whether a new scan was performed
1631  * Returns: Scan results, %NULL on failure
1632  *
1633  * This function request the current scan results from the driver and updates
1634  * the local BSS list wpa_s->bss. The caller is responsible for freeing the
1635  * results with wpa_scan_results_free().
1636  */
1637 struct wpa_scan_results *
1638 wpa_supplicant_get_scan_results(struct wpa_supplicant *wpa_s,
1639                                 struct scan_info *info, int new_scan)
1640 {
1641         struct wpa_scan_results *scan_res;
1642         size_t i;
1643         int (*compar)(const void *, const void *) = wpa_scan_result_compar;
1644
1645         scan_res = wpa_drv_get_scan_results2(wpa_s);
1646         if (scan_res == NULL) {
1647                 wpa_dbg(wpa_s, MSG_DEBUG, "Failed to get scan results");
1648                 return NULL;
1649         }
1650         if (scan_res->fetch_time.sec == 0) {
1651                 /*
1652                  * Make sure we have a valid timestamp if the driver wrapper
1653                  * does not set this.
1654                  */
1655                 os_get_reltime(&scan_res->fetch_time);
1656         }
1657         filter_scan_res(wpa_s, scan_res);
1658
1659 #ifdef CONFIG_WPS
1660         if (wpas_wps_searching(wpa_s)) {
1661                 wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Order scan results with WPS "
1662                         "provisioning rules");
1663                 compar = wpa_scan_result_wps_compar;
1664         }
1665 #endif /* CONFIG_WPS */
1666
1667         qsort(scan_res->res, scan_res->num, sizeof(struct wpa_scan_res *),
1668               compar);
1669         dump_scan_res(scan_res);
1670
1671         wpa_bss_update_start(wpa_s);
1672         for (i = 0; i < scan_res->num; i++)
1673                 wpa_bss_update_scan_res(wpa_s, scan_res->res[i],
1674                                         &scan_res->fetch_time);
1675         wpa_bss_update_end(wpa_s, info, new_scan);
1676
1677         return scan_res;
1678 }
1679
1680
1681 /**
1682  * wpa_supplicant_update_scan_results - Update scan results from the driver
1683  * @wpa_s: Pointer to wpa_supplicant data
1684  * Returns: 0 on success, -1 on failure
1685  *
1686  * This function updates the BSS table within wpa_supplicant based on the
1687  * currently available scan results from the driver without requesting a new
1688  * scan. This is used in cases where the driver indicates an association
1689  * (including roaming within ESS) and wpa_supplicant does not yet have the
1690  * needed information to complete the connection (e.g., to perform validation
1691  * steps in 4-way handshake).
1692  */
1693 int wpa_supplicant_update_scan_results(struct wpa_supplicant *wpa_s)
1694 {
1695         struct wpa_scan_results *scan_res;
1696         scan_res = wpa_supplicant_get_scan_results(wpa_s, NULL, 0);
1697         if (scan_res == NULL)
1698                 return -1;
1699         wpa_scan_results_free(scan_res);
1700
1701         return 0;
1702 }
1703
1704
1705 /**
1706  * scan_only_handler - Reports scan results
1707  */
1708 void scan_only_handler(struct wpa_supplicant *wpa_s,
1709                        struct wpa_scan_results *scan_res)
1710 {
1711         wpa_dbg(wpa_s, MSG_DEBUG, "Scan-only results received");
1712         if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
1713             wpa_s->manual_scan_use_id && wpa_s->own_scan_running) {
1714                 wpa_msg_ctrl(wpa_s, MSG_INFO, WPA_EVENT_SCAN_RESULTS "id=%u",
1715                              wpa_s->manual_scan_id);
1716                 wpa_s->manual_scan_use_id = 0;
1717         } else {
1718                 wpa_msg_ctrl(wpa_s, MSG_INFO, WPA_EVENT_SCAN_RESULTS);
1719         }
1720         wpas_notify_scan_results(wpa_s);
1721         wpas_notify_scan_done(wpa_s, 1);
1722         if (wpa_s->scan_work) {
1723                 struct wpa_radio_work *work = wpa_s->scan_work;
1724                 wpa_s->scan_work = NULL;
1725                 radio_work_done(work);
1726         }
1727 }
1728
1729
1730 int wpas_scan_scheduled(struct wpa_supplicant *wpa_s)
1731 {
1732         return eloop_is_timeout_registered(wpa_supplicant_scan, wpa_s, NULL);
1733 }
1734
1735
1736 struct wpa_driver_scan_params *
1737 wpa_scan_clone_params(const struct wpa_driver_scan_params *src)
1738 {
1739         struct wpa_driver_scan_params *params;
1740         size_t i;
1741         u8 *n;
1742
1743         params = os_zalloc(sizeof(*params));
1744         if (params == NULL)
1745                 return NULL;
1746
1747         for (i = 0; i < src->num_ssids; i++) {
1748                 if (src->ssids[i].ssid) {
1749                         n = os_malloc(src->ssids[i].ssid_len);
1750                         if (n == NULL)
1751                                 goto failed;
1752                         os_memcpy(n, src->ssids[i].ssid,
1753                                   src->ssids[i].ssid_len);
1754                         params->ssids[i].ssid = n;
1755                         params->ssids[i].ssid_len = src->ssids[i].ssid_len;
1756                 }
1757         }
1758         params->num_ssids = src->num_ssids;
1759
1760         if (src->extra_ies) {
1761                 n = os_malloc(src->extra_ies_len);
1762                 if (n == NULL)
1763                         goto failed;
1764                 os_memcpy(n, src->extra_ies, src->extra_ies_len);
1765                 params->extra_ies = n;
1766                 params->extra_ies_len = src->extra_ies_len;
1767         }
1768
1769         if (src->freqs) {
1770                 int len = int_array_len(src->freqs);
1771                 params->freqs = os_malloc((len + 1) * sizeof(int));
1772                 if (params->freqs == NULL)
1773                         goto failed;
1774                 os_memcpy(params->freqs, src->freqs, (len + 1) * sizeof(int));
1775         }
1776
1777         if (src->filter_ssids) {
1778                 params->filter_ssids = os_malloc(sizeof(params->filter_ssids) *
1779                                                  src->num_filter_ssids);
1780                 if (params->filter_ssids == NULL)
1781                         goto failed;
1782                 os_memcpy(params->filter_ssids, src->filter_ssids,
1783                           sizeof(params->filter_ssids) * src->num_filter_ssids);
1784                 params->num_filter_ssids = src->num_filter_ssids;
1785         }
1786
1787         params->filter_rssi = src->filter_rssi;
1788         params->p2p_probe = src->p2p_probe;
1789         params->only_new_results = src->only_new_results;
1790
1791         return params;
1792
1793 failed:
1794         wpa_scan_free_params(params);
1795         return NULL;
1796 }
1797
1798
1799 void wpa_scan_free_params(struct wpa_driver_scan_params *params)
1800 {
1801         size_t i;
1802
1803         if (params == NULL)
1804                 return;
1805
1806         for (i = 0; i < params->num_ssids; i++)
1807                 os_free((u8 *) params->ssids[i].ssid);
1808         os_free((u8 *) params->extra_ies);
1809         os_free(params->freqs);
1810         os_free(params->filter_ssids);
1811         os_free(params);
1812 }