wpa_supplicant/scan.c

   1 /*
   2  * WPA Supplicant - Scanning
   3  * Copyright (c) 2003-2014, Jouni Malinen <j@w1.fi>
   4  *
   5  * This software may be distributed under the terms of the BSD license.
   6  * See README for more details.
   7  */
   8
   9 #include "utils/includes.h"
  10
  11 #include "utils/common.h"
  12 #include "utils/eloop.h"
  13 #include "common/ieee802_11_defs.h"
  14 #include "common/wpa_ctrl.h"
  15 #include "config.h"
  16 #include "wpa_supplicant_i.h"
  17 #include "driver_i.h"
  18 #include "wps_supplicant.h"
  19 #include "p2p_supplicant.h"
  20 #include "p2p/p2p.h"
  21 #include "hs20_supplicant.h"
  22 #include "notify.h"
  23 #include "bss.h"
  24 #include "scan.h"
  25
  26
  27 static void wpa_supplicant_gen_assoc_event(struct wpa_supplicant *wpa_s)
  28 {
  29         struct wpa_ssid *ssid;
  30         union wpa_event_data data;
  31
  32         ssid = wpa_supplicant_get_ssid(wpa_s);
  33         if (ssid == NULL)
  34                 return;
  35
  36         if (wpa_s->current_ssid == NULL) {
  37                 wpa_s->current_ssid = ssid;
  38                 if (wpa_s->current_ssid != NULL)
  39                         wpas_notify_network_changed(wpa_s);
  40         }
  41         wpa_supplicant_initiate_eapol(wpa_s);
  42         wpa_dbg(wpa_s, MSG_DEBUG, "Already associated with a configured "
  43                 "network - generating associated event");
  44         os_memset(&data, 0, sizeof(data));
  45         wpa_supplicant_event(wpa_s, EVENT_ASSOC, &data);
  46 }
  47
  48
  49 #ifdef CONFIG_WPS
  50 static int wpas_wps_in_use(struct wpa_supplicant *wpa_s,
  51                            enum wps_request_type *req_type)
  52 {
  53         struct wpa_ssid *ssid;
  54         int wps = 0;
  55
  56         for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
  57                 if (!(ssid->key_mgmt & WPA_KEY_MGMT_WPS))
  58                         continue;
  59
  60                 wps = 1;
  61                 *req_type = wpas_wps_get_req_type(ssid);
  62                 if (!ssid->eap.phase1)
  63                         continue;
  64
  65                 if (os_strstr(ssid->eap.phase1, "pbc=1"))
  66                         return 2;
  67         }
  68
  69 #ifdef CONFIG_P2P
  70         if (!wpa_s->global->p2p_disabled && wpa_s->global->p2p &&
  71             !wpa_s->conf->p2p_disabled) {
  72                 wpa_s->wps->dev.p2p = 1;
  73                 if (!wps) {
  74                         wps = 1;
  75                         *req_type = WPS_REQ_ENROLLEE_INFO;
  76                 }
  77         }
  78 #endif /* CONFIG_P2P */
  79
  80         return wps;
  81 }
  82 #endif /* CONFIG_WPS */
  83
  84
  85 /**
  86  * wpa_supplicant_enabled_networks - Check whether there are enabled networks
  87  * @wpa_s: Pointer to wpa_supplicant data
  88  * Returns: 0 if no networks are enabled, >0 if networks are enabled
  89  *
  90  * This function is used to figure out whether any networks (or Interworking
  91  * with enabled credentials and auto_interworking) are present in the current
  92  * configuration.
  93  */
  94 int wpa_supplicant_enabled_networks(struct wpa_supplicant *wpa_s)
  95 {
  96         struct wpa_ssid *ssid = wpa_s->conf->ssid;
  97         int count = 0, disabled = 0;
  98         while (ssid) {
  99                 if (!wpas_network_disabled(wpa_s, ssid))
 100                         count++;
 101                 else
 102                         disabled++;
 103                 ssid = ssid->next;
 104         }
 105         if (wpa_s->conf->cred && wpa_s->conf->interworking &&
 106             wpa_s->conf->auto_interworking)
 107                 count++;
 108         if (count == 0 && disabled > 0) {
 109                 wpa_dbg(wpa_s, MSG_DEBUG, "No enabled networks (%d disabled "
 110                         "networks)", disabled);
 111         }
 112         return count;
 113 }
 114
 115
 116 static void wpa_supplicant_assoc_try(struct wpa_supplicant *wpa_s,
 117                                      struct wpa_ssid *ssid)
 118 {
 119         while (ssid) {
 120                 if (!wpas_network_disabled(wpa_s, ssid))
 121                         break;
 122                 ssid = ssid->next;
 123         }
 124
 125         /* ap_scan=2 mode - try to associate with each SSID. */
 126         if (ssid == NULL) {
 127                 wpa_dbg(wpa_s, MSG_DEBUG, "wpa_supplicant_assoc_try: Reached "
 128                         "end of scan list - go back to beginning");
 129                 wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
 130                 wpa_supplicant_req_scan(wpa_s, 0, 0);
 131                 return;
 132         }
 133         if (ssid->next) {
 134                 /* Continue from the next SSID on the next attempt. */
 135                 wpa_s->prev_scan_ssid = ssid;
 136         } else {
 137                 /* Start from the beginning of the SSID list. */
 138                 wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
 139         }
 140         wpa_supplicant_associate(wpa_s, NULL, ssid);
 141 }
 142
 143
 144 static void wpas_trigger_scan_cb(struct wpa_radio_work *work, int deinit)
 145 {
 146         struct wpa_supplicant *wpa_s = work->wpa_s;
 147         struct wpa_driver_scan_params *params = work->ctx;
 148         int ret;
 149
 150         if (deinit) {
 151                 wpa_scan_free_params(params);
 152                 return;
 153         }
 154
 155         wpa_supplicant_notify_scanning(wpa_s, 1);
 156
 157         if (wpa_s->clear_driver_scan_cache)
 158                 params->only_new_results = 1;
 159         ret = wpa_drv_scan(wpa_s, params);
 160         wpa_scan_free_params(params);
 161         work->ctx = NULL;
 162         if (ret) {
 163                 wpa_supplicant_notify_scanning(wpa_s, 0);
 164                 wpas_notify_scan_done(wpa_s, 0);
 165                 radio_work_done(work);
 166                 return;
 167         }
 168
 169         os_get_reltime(&wpa_s->scan_trigger_time);
 170         wpa_s->scan_runs++;
 171         wpa_s->normal_scans++;
 172         wpa_s->own_scan_requested = 1;
 173         wpa_s->clear_driver_scan_cache = 0;
 174         wpa_s->scan_work = work;
 175 }
 176
 177
 178 /**
 179  * wpa_supplicant_trigger_scan - Request driver to start a scan
 180  * @wpa_s: Pointer to wpa_supplicant data
 181  * @params: Scan parameters
 182  * Returns: 0 on success, -1 on failure
 183  */
 184 int wpa_supplicant_trigger_scan(struct wpa_supplicant *wpa_s,
 185                                 struct wpa_driver_scan_params *params)
 186 {
 187         struct wpa_driver_scan_params *ctx;
 188
 189         if (wpa_s->scan_work) {
 190                 wpa_dbg(wpa_s, MSG_INFO, "Reject scan trigger since one is already pending");
 191                 return -1;
 192         }
 193
 194         ctx = wpa_scan_clone_params(params);
 195         if (ctx == NULL)
 196                 return -1;
 197
 198         if (radio_add_work(wpa_s, 0, "scan", 0, wpas_trigger_scan_cb, ctx) < 0)
 199         {
 200                 wpa_scan_free_params(ctx);
 201                 return -1;
 202         }
 203
 204         return 0;
 205 }
 206
 207
 208 static void
 209 wpa_supplicant_delayed_sched_scan_timeout(void *eloop_ctx, void *timeout_ctx)
 210 {
 211         struct wpa_supplicant *wpa_s = eloop_ctx;
 212
 213         wpa_dbg(wpa_s, MSG_DEBUG, "Starting delayed sched scan");
 214
 215         if (wpa_supplicant_req_sched_scan(wpa_s))
 216                 wpa_supplicant_req_scan(wpa_s, 0, 0);
 217 }
 218
 219
 220 static void
 221 wpa_supplicant_sched_scan_timeout(void *eloop_ctx, void *timeout_ctx)
 222 {
 223         struct wpa_supplicant *wpa_s = eloop_ctx;
 224
 225         wpa_dbg(wpa_s, MSG_DEBUG, "Sched scan timeout - stopping it");
 226
 227         wpa_s->sched_scan_timed_out = 1;
 228         wpa_supplicant_cancel_sched_scan(wpa_s);
 229 }
 230
 231
 232 int wpa_supplicant_start_sched_scan(struct wpa_supplicant *wpa_s,
 233                                     struct wpa_driver_scan_params *params,
 234                                     int interval)
 235 {
 236         int ret;
 237
 238         wpa_supplicant_notify_scanning(wpa_s, 1);
 239         ret = wpa_drv_sched_scan(wpa_s, params, interval * 1000);
 240         if (ret)
 241                 wpa_supplicant_notify_scanning(wpa_s, 0);
 242         else
 243                 wpa_s->sched_scanning = 1;
 244
 245         return ret;
 246 }
 247
 248
 249 int wpa_supplicant_stop_sched_scan(struct wpa_supplicant *wpa_s)
 250 {
 251         int ret;
 252
 253         ret = wpa_drv_stop_sched_scan(wpa_s);
 254         if (ret) {
 255                 wpa_dbg(wpa_s, MSG_DEBUG, "stopping sched_scan failed!");
 256                 /* TODO: what to do if stopping fails? */
 257                 return -1;
 258         }
 259
 260         return ret;
 261 }
 262
 263
 264 static struct wpa_driver_scan_filter *
 265 wpa_supplicant_build_filter_ssids(struct wpa_config *conf, size_t *num_ssids)
 266 {
 267         struct wpa_driver_scan_filter *ssids;
 268         struct wpa_ssid *ssid;
 269         size_t count;
 270
 271         *num_ssids = 0;
 272         if (!conf->filter_ssids)
 273                 return NULL;
 274
 275         for (count = 0, ssid = conf->ssid; ssid; ssid = ssid->next) {
 276                 if (ssid->ssid && ssid->ssid_len)
 277                         count++;
 278         }
 279         if (count == 0)
 280                 return NULL;
 281         ssids = os_zalloc(count * sizeof(struct wpa_driver_scan_filter));
 282         if (ssids == NULL)
 283                 return NULL;
 284
 285         for (ssid = conf->ssid; ssid; ssid = ssid->next) {
 286                 if (!ssid->ssid || !ssid->ssid_len)
 287                         continue;
 288                 os_memcpy(ssids[*num_ssids].ssid, ssid->ssid, ssid->ssid_len);
 289                 ssids[*num_ssids].ssid_len = ssid->ssid_len;
 290                 (*num_ssids)++;
 291         }
 292
 293         return ssids;
 294 }
 295
 296
 297 static void wpa_supplicant_optimize_freqs(
 298         struct wpa_supplicant *wpa_s, struct wpa_driver_scan_params *params)
 299 {
 300 #ifdef CONFIG_P2P
 301         if (params->freqs == NULL && wpa_s->p2p_in_provisioning &&
 302             wpa_s->go_params) {
 303                 /* Optimize provisioning state scan based on GO information */
 304                 if (wpa_s->p2p_in_provisioning < 5 &&
 305                     wpa_s->go_params->freq > 0) {
 306                         wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only GO "
 307                                 "preferred frequency %d MHz",
 308                                 wpa_s->go_params->freq);
 309                         params->freqs = os_zalloc(2 * sizeof(int));
 310                         if (params->freqs)
 311                                 params->freqs[0] = wpa_s->go_params->freq;
 312                 } else if (wpa_s->p2p_in_provisioning < 8 &&
 313                            wpa_s->go_params->freq_list[0]) {
 314                         wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only common "
 315                                 "channels");
 316                         int_array_concat(&params->freqs,
 317                                          wpa_s->go_params->freq_list);
 318                         if (params->freqs)
 319                                 int_array_sort_unique(params->freqs);
 320                 }
 321                 wpa_s->p2p_in_provisioning++;
 322         }
 323 #endif /* CONFIG_P2P */
 324
 325 #ifdef CONFIG_WPS
 326         if (params->freqs == NULL && wpa_s->after_wps && wpa_s->wps_freq) {
 327                 /*
 328                  * Optimize post-provisioning scan based on channel used
 329                  * during provisioning.
 330                  */
 331                 wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Scan only frequency %u MHz "
 332                         "that was used during provisioning", wpa_s->wps_freq);
 333                 params->freqs = os_zalloc(2 * sizeof(int));
 334                 if (params->freqs)
 335                         params->freqs[0] = wpa_s->wps_freq;
 336                 wpa_s->after_wps--;
 337         } else if (wpa_s->after_wps)
 338                 wpa_s->after_wps--;
 339
 340         if (params->freqs == NULL && wpa_s->known_wps_freq && wpa_s->wps_freq)
 341         {
 342                 /* Optimize provisioning scan based on already known channel */
 343                 wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Scan only frequency %u MHz",
 344                         wpa_s->wps_freq);
 345                 params->freqs = os_zalloc(2 * sizeof(int));
 346                 if (params->freqs)
 347                         params->freqs[0] = wpa_s->wps_freq;
 348                 wpa_s->known_wps_freq = 0; /* only do this once */
 349         }
 350 #endif /* CONFIG_WPS */
 351 }
 352
 353
 354 #ifdef CONFIG_INTERWORKING
 355 static void wpas_add_interworking_elements(struct wpa_supplicant *wpa_s,
 356                                            struct wpabuf *buf)
 357 {
 358         if (wpa_s->conf->interworking == 0)
 359                 return;
 360
 361         wpabuf_put_u8(buf, WLAN_EID_EXT_CAPAB);
 362         wpabuf_put_u8(buf, 4);
 363         wpabuf_put_u8(buf, 0x00);
 364         wpabuf_put_u8(buf, 0x00);
 365         wpabuf_put_u8(buf, 0x00);
 366         wpabuf_put_u8(buf, 0x80); /* Bit 31 - Interworking */
 367
 368         wpabuf_put_u8(buf, WLAN_EID_INTERWORKING);
 369         wpabuf_put_u8(buf, is_zero_ether_addr(wpa_s->conf->hessid) ? 1 :
 370                       1 + ETH_ALEN);
 371         wpabuf_put_u8(buf, wpa_s->conf->access_network_type);
 372         /* No Venue Info */
 373         if (!is_zero_ether_addr(wpa_s->conf->hessid))
 374                 wpabuf_put_data(buf, wpa_s->conf->hessid, ETH_ALEN);
 375 }
 376 #endif /* CONFIG_INTERWORKING */
 377
 378
 379 static struct wpabuf * wpa_supplicant_extra_ies(struct wpa_supplicant *wpa_s)
 380 {
 381         struct wpabuf *extra_ie = NULL;
 382 #ifdef CONFIG_WPS
 383         int wps = 0;
 384         enum wps_request_type req_type = WPS_REQ_ENROLLEE_INFO;
 385 #endif /* CONFIG_WPS */
 386
 387 #ifdef CONFIG_INTERWORKING
 388         if (wpa_s->conf->interworking &&
 389             wpabuf_resize(&extra_ie, 100) == 0)
 390                 wpas_add_interworking_elements(wpa_s, extra_ie);
 391 #endif /* CONFIG_INTERWORKING */
 392
 393 #ifdef CONFIG_WPS
 394         wps = wpas_wps_in_use(wpa_s, &req_type);
 395
 396         if (wps) {
 397                 struct wpabuf *wps_ie;
 398                 wps_ie = wps_build_probe_req_ie(wps == 2 ? DEV_PW_PUSHBUTTON :
 399                                                 DEV_PW_DEFAULT,
 400                                                 &wpa_s->wps->dev,
 401                                                 wpa_s->wps->uuid, req_type,
 402                                                 0, NULL);
 403                 if (wps_ie) {
 404                         if (wpabuf_resize(&extra_ie, wpabuf_len(wps_ie)) == 0)
 405                                 wpabuf_put_buf(extra_ie, wps_ie);
 406                         wpabuf_free(wps_ie);
 407                 }
 408         }
 409
 410 #ifdef CONFIG_P2P
 411         if (wps) {
 412                 size_t ielen = p2p_scan_ie_buf_len(wpa_s->global->p2p);
 413                 if (wpabuf_resize(&extra_ie, ielen) == 0)
 414                         wpas_p2p_scan_ie(wpa_s, extra_ie);
 415         }
 416 #endif /* CONFIG_P2P */
 417
 418 #endif /* CONFIG_WPS */
 419
 420 #ifdef CONFIG_HS20
 421         if (wpa_s->conf->hs20 && wpabuf_resize(&extra_ie, 7) == 0)
 422                 wpas_hs20_add_indication(extra_ie);
 423 #endif /* CONFIG_HS20 */
 424
 425         return extra_ie;
 426 }
 427
 428
 429 #ifdef CONFIG_P2P
 430
 431 /*
 432  * Check whether there are any enabled networks or credentials that could be
 433  * used for a non-P2P connection.
 434  */
 435 static int non_p2p_network_enabled(struct wpa_supplicant *wpa_s)
 436 {
 437         struct wpa_ssid *ssid;
 438
 439         for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
 440                 if (wpas_network_disabled(wpa_s, ssid))
 441                         continue;
 442                 if (!ssid->p2p_group)
 443                         return 1;
 444         }
 445
 446         if (wpa_s->conf->cred && wpa_s->conf->interworking &&
 447             wpa_s->conf->auto_interworking)
 448                 return 1;
 449
 450         return 0;
 451 }
 452
 453 #endif /* CONFIG_P2P */
 454
 455
 456 static struct hostapd_hw_modes * get_mode(struct hostapd_hw_modes *modes,
 457                                           u16 num_modes,
 458                                           enum hostapd_hw_mode mode)
 459 {
 460         u16 i;
 461
 462         for (i = 0; i < num_modes; i++) {
 463                 if (modes[i].mode == mode)
 464                         return &modes[i];
 465         }
 466
 467         return NULL;
 468 }
 469
 470
 471 static void wpa_setband_scan_freqs_list(struct wpa_supplicant *wpa_s,
 472                                         enum hostapd_hw_mode band,
 473                                         struct wpa_driver_scan_params *params)
 474 {
 475         /* Include only supported channels for the specified band */
 476         struct hostapd_hw_modes *mode;
 477         int count, i;
 478
 479         mode = get_mode(wpa_s->hw.modes, wpa_s->hw.num_modes, band);
 480         if (mode == NULL) {
 481                 /* No channels supported in this band - use empty list */
 482                 params->freqs = os_zalloc(sizeof(int));
 483                 return;
 484         }
 485
 486         params->freqs = os_zalloc((mode->num_channels + 1) * sizeof(int));
 487         if (params->freqs == NULL)
 488                 return;
 489         for (count = 0, i = 0; i < mode->num_channels; i++) {
 490                 if (mode->channels[i].flag & HOSTAPD_CHAN_DISABLED)
 491                         continue;
 492                 params->freqs[count++] = mode->channels[i].freq;
 493         }
 494 }
 495
 496
 497 static void wpa_setband_scan_freqs(struct wpa_supplicant *wpa_s,
 498                                    struct wpa_driver_scan_params *params)
 499 {
 500         if (wpa_s->hw.modes == NULL)
 501                 return; /* unknown what channels the driver supports */
 502         if (params->freqs)
 503                 return; /* already using a limited channel set */
 504         if (wpa_s->setband == WPA_SETBAND_5G)
 505                 wpa_setband_scan_freqs_list(wpa_s, HOSTAPD_MODE_IEEE80211A,
 506                                             params);
 507         else if (wpa_s->setband == WPA_SETBAND_2G)
 508                 wpa_setband_scan_freqs_list(wpa_s, HOSTAPD_MODE_IEEE80211G,
 509                                             params);
 510 }
 511
 512
 513 static void wpa_supplicant_scan(void *eloop_ctx, void *timeout_ctx)
 514 {
 515         struct wpa_supplicant *wpa_s = eloop_ctx;
 516         struct wpa_ssid *ssid;
 517         int ret;
 518         struct wpabuf *extra_ie = NULL;
 519         struct wpa_driver_scan_params params;
 520         struct wpa_driver_scan_params *scan_params;
 521         size_t max_ssids;
 522         enum wpa_states prev_state;
 523
 524         if (wpa_s->wpa_state == WPA_INTERFACE_DISABLED) {
 525                 wpa_dbg(wpa_s, MSG_DEBUG, "Skip scan - interface disabled");
 526                 return;
 527         }
 528
 529         if (wpa_s->disconnected && wpa_s->scan_req == NORMAL_SCAN_REQ) {
 530                 wpa_dbg(wpa_s, MSG_DEBUG, "Disconnected - do not scan");
 531                 wpa_supplicant_set_state(wpa_s, WPA_DISCONNECTED);
 532                 return;
 533         }
 534
 535         if (wpa_s->scanning) {
 536                 /*
 537                  * If we are already in scanning state, we shall reschedule the
 538                  * the incoming scan request.
 539                  */
 540                 wpa_dbg(wpa_s, MSG_DEBUG, "Already scanning - Reschedule the incoming scan req");
 541                 wpa_supplicant_req_scan(wpa_s, 1, 0);
 542                 return;
 543         }
 544
 545         if (wpa_s->external_scan_running) {
 546                 struct os_reltime now, diff;
 547                 os_get_reltime(&now);
 548                 os_reltime_sub(&now, &wpa_s->scan_start_time, &diff);
 549                 if (diff.sec < 30) {
 550                         wpa_dbg(wpa_s, MSG_DEBUG, "Externally triggered scan running - Reschedule the incoming scan req");
 551                         wpa_supplicant_req_scan(wpa_s, 1, 0);
 552                         return;
 553                 }
 554         }
 555
 556         if (!wpa_supplicant_enabled_networks(wpa_s) &&
 557             wpa_s->scan_req == NORMAL_SCAN_REQ) {
 558                 wpa_dbg(wpa_s, MSG_DEBUG, "No enabled networks - do not scan");
 559                 wpa_supplicant_set_state(wpa_s, WPA_INACTIVE);
 560                 return;
 561         }
 562
 563         if (wpa_s->conf->ap_scan != 0 &&
 564             (wpa_s->drv_flags & WPA_DRIVER_FLAGS_WIRED)) {
 565                 wpa_dbg(wpa_s, MSG_DEBUG, "Using wired authentication - "
 566                         "overriding ap_scan configuration");
 567                 wpa_s->conf->ap_scan = 0;
 568                 wpas_notify_ap_scan_changed(wpa_s);
 569         }
 570
 571         if (wpa_s->conf->ap_scan == 0) {
 572                 wpa_supplicant_gen_assoc_event(wpa_s);
 573                 return;
 574         }
 575
 576 #ifdef CONFIG_P2P
 577         if (wpas_p2p_in_progress(wpa_s) || wpas_wpa_is_in_progress(wpa_s, 0)) {
 578                 wpa_dbg(wpa_s, MSG_DEBUG, "Delay station mode scan while P2P operation is in progress");
 579                 wpa_supplicant_req_scan(wpa_s, 5, 0);
 580                 return;
 581         }
 582 #endif /* CONFIG_P2P */
 583
 584         if (wpa_s->conf->ap_scan == 2)
 585                 max_ssids = 1;
 586         else {
 587                 max_ssids = wpa_s->max_scan_ssids;
 588                 if (max_ssids > WPAS_MAX_SCAN_SSIDS)
 589                         max_ssids = WPAS_MAX_SCAN_SSIDS;
 590         }
 591
 592         wpa_s->last_scan_req = wpa_s->scan_req;
 593         wpa_s->scan_req = NORMAL_SCAN_REQ;
 594
 595         os_memset(&params, 0, sizeof(params));
 596
 597         prev_state = wpa_s->wpa_state;
 598         if (wpa_s->wpa_state == WPA_DISCONNECTED ||
 599             wpa_s->wpa_state == WPA_INACTIVE)
 600                 wpa_supplicant_set_state(wpa_s, WPA_SCANNING);
 601
 602         /*
 603          * If autoscan has set its own scanning parameters
 604          */
 605         if (wpa_s->autoscan_params != NULL) {
 606                 scan_params = wpa_s->autoscan_params;
 607                 goto scan;
 608         }
 609
 610         if (wpa_s->last_scan_req != MANUAL_SCAN_REQ &&
 611             wpa_s->connect_without_scan) {
 612                 for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
 613                         if (ssid == wpa_s->connect_without_scan)
 614                                 break;
 615                 }
 616                 wpa_s->connect_without_scan = NULL;
 617                 if (ssid) {
 618                         wpa_printf(MSG_DEBUG, "Start a pre-selected network "
 619                                    "without scan step");
 620                         wpa_supplicant_associate(wpa_s, NULL, ssid);
 621                         return;
 622                 }
 623         }
 624
 625 #ifdef CONFIG_P2P
 626         if ((wpa_s->p2p_in_provisioning || wpa_s->show_group_started) &&
 627             wpa_s->go_params) {
 628                 wpa_printf(MSG_DEBUG, "P2P: Use specific SSID for scan during P2P group formation (p2p_in_provisioning=%d show_group_started=%d)",
 629                            wpa_s->p2p_in_provisioning,
 630                            wpa_s->show_group_started);
 631                 params.ssids[0].ssid = wpa_s->go_params->ssid;
 632                 params.ssids[0].ssid_len = wpa_s->go_params->ssid_len;
 633                 params.num_ssids = 1;
 634                 goto ssid_list_set;
 635         }
 636 #endif /* CONFIG_P2P */
 637
 638         /* Find the starting point from which to continue scanning */
 639         ssid = wpa_s->conf->ssid;
 640         if (wpa_s->prev_scan_ssid != WILDCARD_SSID_SCAN) {
 641                 while (ssid) {
 642                         if (ssid == wpa_s->prev_scan_ssid) {
 643                                 ssid = ssid->next;
 644                                 break;
 645                         }
 646                         ssid = ssid->next;
 647                 }
 648         }
 649
 650         if (wpa_s->last_scan_req != MANUAL_SCAN_REQ &&
 651             wpa_s->conf->ap_scan == 2) {
 652                 wpa_s->connect_without_scan = NULL;
 653                 wpa_s->prev_scan_wildcard = 0;
 654                 wpa_supplicant_assoc_try(wpa_s, ssid);
 655                 return;
 656         } else if (wpa_s->conf->ap_scan == 2) {
 657                 /*
 658                  * User-initiated scan request in ap_scan == 2; scan with
 659                  * wildcard SSID.
 660                  */
 661                 ssid = NULL;
 662         } else {
 663                 struct wpa_ssid *start = ssid, *tssid;
 664                 int freqs_set = 0;
 665                 if (ssid == NULL && max_ssids > 1)
 666                         ssid = wpa_s->conf->ssid;
 667                 while (ssid) {
 668                         if (!wpas_network_disabled(wpa_s, ssid) &&
 669                             ssid->scan_ssid) {
 670                                 wpa_hexdump_ascii(MSG_DEBUG, "Scan SSID",
 671                                                   ssid->ssid, ssid->ssid_len);
 672                                 params.ssids[params.num_ssids].ssid =
 673                                         ssid->ssid;
 674                                 params.ssids[params.num_ssids].ssid_len =
 675                                         ssid->ssid_len;
 676                                 params.num_ssids++;
 677                                 if (params.num_ssids + 1 >= max_ssids)
 678                                         break;
 679                         }
 680                         ssid = ssid->next;
 681                         if (ssid == start)
 682                                 break;
 683                         if (ssid == NULL && max_ssids > 1 &&
 684                             start != wpa_s->conf->ssid)
 685                                 ssid = wpa_s->conf->ssid;
 686                 }
 687
 688                 for (tssid = wpa_s->conf->ssid; tssid; tssid = tssid->next) {
 689                         if (wpas_network_disabled(wpa_s, tssid))
 690                                 continue;
 691                         if ((params.freqs || !freqs_set) && tssid->scan_freq) {
 692                                 int_array_concat(&params.freqs,
 693                                                  tssid->scan_freq);
 694                         } else {
 695                                 os_free(params.freqs);
 696                                 params.freqs = NULL;
 697                         }
 698                         freqs_set = 1;
 699                 }
 700                 int_array_sort_unique(params.freqs);
 701         }
 702
 703         if (ssid && max_ssids == 1) {
 704                 /*
 705                  * If the driver is limited to 1 SSID at a time interleave
 706                  * wildcard SSID scans with specific SSID scans to avoid
 707                  * waiting a long time for a wildcard scan.
 708                  */
 709                 if (!wpa_s->prev_scan_wildcard) {
 710                         params.ssids[0].ssid = NULL;
 711                         params.ssids[0].ssid_len = 0;
 712                         wpa_s->prev_scan_wildcard = 1;
 713                         wpa_dbg(wpa_s, MSG_DEBUG, "Starting AP scan for "
 714                                 "wildcard SSID (Interleave with specific)");
 715                 } else {
 716                         wpa_s->prev_scan_ssid = ssid;
 717                         wpa_s->prev_scan_wildcard = 0;
 718                         wpa_dbg(wpa_s, MSG_DEBUG,
 719                                 "Starting AP scan for specific SSID: %s",
 720                                 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
 721                 }
 722         } else if (ssid) {
 723                 /* max_ssids > 1 */
 724
 725                 wpa_s->prev_scan_ssid = ssid;
 726                 wpa_dbg(wpa_s, MSG_DEBUG, "Include wildcard SSID in "
 727                         "the scan request");
 728                 params.num_ssids++;
 729         } else if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
 730                    wpa_s->manual_scan_passive && params.num_ssids == 0) {
 731                 wpa_dbg(wpa_s, MSG_DEBUG, "Use passive scan based on manual request");
 732         } else {
 733                 wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
 734                 params.num_ssids++;
 735                 wpa_dbg(wpa_s, MSG_DEBUG, "Starting AP scan for wildcard "
 736                         "SSID");
 737         }
 738 #ifdef CONFIG_P2P
 739 ssid_list_set:
 740 #endif /* CONFIG_P2P */
 741
 742         wpa_supplicant_optimize_freqs(wpa_s, &params);
 743         extra_ie = wpa_supplicant_extra_ies(wpa_s);
 744
 745         if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
 746             wpa_s->manual_scan_only_new)
 747                 params.only_new_results = 1;
 748
 749         if (wpa_s->last_scan_req == MANUAL_SCAN_REQ && params.freqs == NULL &&
 750             wpa_s->manual_scan_freqs) {
 751                 wpa_dbg(wpa_s, MSG_DEBUG, "Limit manual scan to specified channels");
 752                 params.freqs = wpa_s->manual_scan_freqs;
 753                 wpa_s->manual_scan_freqs = NULL;
 754         }
 755
 756         if (params.freqs == NULL && wpa_s->next_scan_freqs) {
 757                 wpa_dbg(wpa_s, MSG_DEBUG, "Optimize scan based on previously "
 758                         "generated frequency list");
 759                 params.freqs = wpa_s->next_scan_freqs;
 760         } else
 761                 os_free(wpa_s->next_scan_freqs);
 762         wpa_s->next_scan_freqs = NULL;
 763         wpa_setband_scan_freqs(wpa_s, &params);
 764
 765         /* See if user specified frequencies. If so, scan only those. */
 766         if (wpa_s->conf->freq_list && !params.freqs) {
 767                 wpa_dbg(wpa_s, MSG_DEBUG,
 768                         "Optimize scan based on conf->freq_list");
 769                 int_array_concat(&params.freqs, wpa_s->conf->freq_list);
 770         }
 771
 772         /* Use current associated channel? */
 773         if (wpa_s->conf->scan_cur_freq && !params.freqs) {
 774                 unsigned int num = wpa_s->num_multichan_concurrent;
 775
 776                 params.freqs = os_calloc(num + 1, sizeof(int));
 777                 if (params.freqs) {
 778                         num = get_shared_radio_freqs(wpa_s, params.freqs, num);
 779                         if (num > 0) {
 780                                 wpa_dbg(wpa_s, MSG_DEBUG, "Scan only the "
 781                                         "current operating channels since "
 782                                         "scan_cur_freq is enabled");
 783                         } else {
 784                                 os_free(params.freqs);
 785                                 params.freqs = NULL;
 786                         }
 787                 }
 788         }
 789
 790         params.filter_ssids = wpa_supplicant_build_filter_ssids(
 791                 wpa_s->conf, &params.num_filter_ssids);
 792         if (extra_ie) {
 793                 params.extra_ies = wpabuf_head(extra_ie);
 794                 params.extra_ies_len = wpabuf_len(extra_ie);
 795         }
 796
 797 #ifdef CONFIG_P2P
 798         if (wpa_s->p2p_in_provisioning ||
 799             (wpa_s->show_group_started && wpa_s->go_params)) {
 800                 /*
 801                  * The interface may not yet be in P2P mode, so we have to
 802                  * explicitly request P2P probe to disable CCK rates.
 803                  */
 804                 params.p2p_probe = 1;
 805         }
 806 #endif /* CONFIG_P2P */
 807
 808         scan_params = &params;
 809
 810 scan:
 811 #ifdef CONFIG_P2P
 812         /*
 813          * If the driver does not support multi-channel concurrency and a
 814          * virtual interface that shares the same radio with the wpa_s interface
 815          * is operating there may not be need to scan other channels apart from
 816          * the current operating channel on the other virtual interface. Filter
 817          * out other channels in case we are trying to find a connection for a
 818          * station interface when we are not configured to prefer station
 819          * connection and a concurrent operation is already in process.
 820          */
 821         if (wpa_s->scan_for_connection &&
 822             wpa_s->last_scan_req == NORMAL_SCAN_REQ &&
 823             !scan_params->freqs && !params.freqs &&
 824             wpas_is_p2p_prioritized(wpa_s) &&
 825             wpa_s->p2p_group_interface == NOT_P2P_GROUP_INTERFACE &&
 826             non_p2p_network_enabled(wpa_s)) {
 827                 unsigned int num = wpa_s->num_multichan_concurrent;
 828
 829                 params.freqs = os_calloc(num + 1, sizeof(int));
 830                 if (params.freqs) {
 831                         num = get_shared_radio_freqs(wpa_s, params.freqs, num);
 832                         if (num > 0 && num == wpa_s->num_multichan_concurrent) {
 833                                 wpa_dbg(wpa_s, MSG_DEBUG, "Scan only the current operating channels since all channels are already used");
 834                         } else {
 835                                 os_free(params.freqs);
 836                                 params.freqs = NULL;
 837                         }
 838                 }
 839         }
 840 #endif /* CONFIG_P2P */
 841
 842         ret = wpa_supplicant_trigger_scan(wpa_s, scan_params);
 843
 844         if (ret && wpa_s->last_scan_req == MANUAL_SCAN_REQ && params.freqs &&
 845             !wpa_s->manual_scan_freqs) {
 846                 /* Restore manual_scan_freqs for the next attempt */
 847                 wpa_s->manual_scan_freqs = params.freqs;
 848                 params.freqs = NULL;
 849         }
 850
 851         wpabuf_free(extra_ie);
 852         os_free(params.freqs);
 853         os_free(params.filter_ssids);
 854
 855         if (ret) {
 856                 wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate AP scan");
 857                 if (prev_state != wpa_s->wpa_state)
 858                         wpa_supplicant_set_state(wpa_s, prev_state);
 859                 /* Restore scan_req since we will try to scan again */
 860                 wpa_s->scan_req = wpa_s->last_scan_req;
 861                 wpa_supplicant_req_scan(wpa_s, 1, 0);
 862         } else {
 863                 wpa_s->scan_for_connection = 0;
 864         }
 865 }
 866
 867
 868 void wpa_supplicant_update_scan_int(struct wpa_supplicant *wpa_s, int sec)
 869 {
 870         struct os_reltime remaining, new_int;
 871         int cancelled;
 872
 873         cancelled = eloop_cancel_timeout_one(wpa_supplicant_scan, wpa_s, NULL,
 874                                              &remaining);
 875
 876         new_int.sec = sec;
 877         new_int.usec = 0;
 878         if (cancelled && os_reltime_before(&remaining, &new_int)) {
 879                 new_int.sec = remaining.sec;
 880                 new_int.usec = remaining.usec;
 881         }
 882
 883         if (cancelled) {
 884                 eloop_register_timeout(new_int.sec, new_int.usec,
 885                                        wpa_supplicant_scan, wpa_s, NULL);
 886         }
 887         wpa_s->scan_interval = sec;
 888 }
 889
 890
 891 /**
 892  * wpa_supplicant_req_scan - Schedule a scan for neighboring access points
 893  * @wpa_s: Pointer to wpa_supplicant data
 894  * @sec: Number of seconds after which to scan
 895  * @usec: Number of microseconds after which to scan
 896  *
 897  * This function is used to schedule a scan for neighboring access points after
 898  * the specified time.
 899  */
 900 void wpa_supplicant_req_scan(struct wpa_supplicant *wpa_s, int sec, int usec)
 901 {
 902         if (eloop_deplete_timeout(sec, usec, wpa_supplicant_scan, wpa_s, NULL))
 903         {
 904                 wpa_dbg(wpa_s, MSG_DEBUG, "Rescheduling scan request: %d sec %d usec",
 905                         sec, usec);
 906                 return;
 907         }
 908
 909         wpa_dbg(wpa_s, MSG_DEBUG, "Setting scan request: %d sec %d usec",
 910                 sec, usec);
 911         eloop_cancel_timeout(wpa_supplicant_scan, wpa_s, NULL);
 912         eloop_register_timeout(sec, usec, wpa_supplicant_scan, wpa_s, NULL);
 913 }
 914
 915
 916 /**
 917  * wpa_supplicant_delayed_sched_scan - Request a delayed scheduled scan
 918  * @wpa_s: Pointer to wpa_supplicant data
 919  * @sec: Number of seconds after which to scan
 920  * @usec: Number of microseconds after which to scan
 921  * Returns: 0 on success or -1 otherwise
 922  *
 923  * This function is used to schedule periodic scans for neighboring
 924  * access points after the specified time.
 925  */
 926 int wpa_supplicant_delayed_sched_scan(struct wpa_supplicant *wpa_s,
 927                                       int sec, int usec)
 928 {
 929         if (!wpa_s->sched_scan_supported)
 930                 return -1;
 931
 932         eloop_register_timeout(sec, usec,
 933                                wpa_supplicant_delayed_sched_scan_timeout,
 934                                wpa_s, NULL);
 935
 936         return 0;
 937 }
 938
 939
 940 /**
 941  * wpa_supplicant_req_sched_scan - Start a periodic scheduled scan
 942  * @wpa_s: Pointer to wpa_supplicant data
 943  * Returns: 0 is sched_scan was started or -1 otherwise
 944  *
 945  * This function is used to schedule periodic scans for neighboring
 946  * access points repeating the scan continuously.
 947  */
 948 int wpa_supplicant_req_sched_scan(struct wpa_supplicant *wpa_s)
 949 {
 950         struct wpa_driver_scan_params params;
 951         struct wpa_driver_scan_params *scan_params;
 952         enum wpa_states prev_state;
 953         struct wpa_ssid *ssid = NULL;
 954         struct wpabuf *extra_ie = NULL;
 955         int ret;
 956         unsigned int max_sched_scan_ssids;
 957         int wildcard = 0;
 958         int need_ssids;
 959
 960         if (!wpa_s->sched_scan_supported)
 961                 return -1;
 962
 963         if (wpa_s->max_sched_scan_ssids > WPAS_MAX_SCAN_SSIDS)
 964                 max_sched_scan_ssids = WPAS_MAX_SCAN_SSIDS;
 965         else
 966                 max_sched_scan_ssids = wpa_s->max_sched_scan_ssids;
 967         if (max_sched_scan_ssids < 1 || wpa_s->conf->disable_scan_offload)
 968                 return -1;
 969
 970         if (wpa_s->sched_scanning) {
 971                 wpa_dbg(wpa_s, MSG_DEBUG, "Already sched scanning");
 972                 return 0;
 973         }
 974
 975         need_ssids = 0;
 976         for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
 977                 if (!wpas_network_disabled(wpa_s, ssid) && !ssid->scan_ssid) {
 978                         /* Use wildcard SSID to find this network */
 979                         wildcard = 1;
 980                 } else if (!wpas_network_disabled(wpa_s, ssid) &&
 981                            ssid->ssid_len)
 982                         need_ssids++;
 983
 984 #ifdef CONFIG_WPS
 985                 if (!wpas_network_disabled(wpa_s, ssid) &&
 986                     ssid->key_mgmt == WPA_KEY_MGMT_WPS) {
 987                         /*
 988                          * Normal scan is more reliable and faster for WPS
 989                          * operations and since these are for short periods of
 990                          * time, the benefit of trying to use sched_scan would
 991                          * be limited.
 992                          */
 993                         wpa_dbg(wpa_s, MSG_DEBUG, "Use normal scan instead of "
 994                                 "sched_scan for WPS");
 995                         return -1;
 996                 }
 997 #endif /* CONFIG_WPS */
 998         }
 999         if (wildcard)
1000                 need_ssids++;
1001
1002         if (wpa_s->normal_scans < 3 &&
1003             (need_ssids <= wpa_s->max_scan_ssids ||
1004              wpa_s->max_scan_ssids >= (int) max_sched_scan_ssids)) {
1005                 /*
1006                  * When normal scan can speed up operations, use that for the
1007                  * first operations before starting the sched_scan to allow
1008                  * user space sleep more. We do this only if the normal scan
1009                  * has functionality that is suitable for this or if the
1010                  * sched_scan does not have better support for multiple SSIDs.
1011                  */
1012                 wpa_dbg(wpa_s, MSG_DEBUG, "Use normal scan instead of "
1013                         "sched_scan for initial scans (normal_scans=%d)",
1014                         wpa_s->normal_scans);
1015                 return -1;
1016         }
1017
1018         os_memset(&params, 0, sizeof(params));
1019
1020         /* If we can't allocate space for the filters, we just don't filter */
1021         params.filter_ssids = os_zalloc(wpa_s->max_match_sets *
1022                                         sizeof(struct wpa_driver_scan_filter));
1023
1024         prev_state = wpa_s->wpa_state;
1025         if (wpa_s->wpa_state == WPA_DISCONNECTED ||
1026             wpa_s->wpa_state == WPA_INACTIVE)
1027                 wpa_supplicant_set_state(wpa_s, WPA_SCANNING);
1028
1029         if (wpa_s->autoscan_params != NULL) {
1030                 scan_params = wpa_s->autoscan_params;
1031                 goto scan;
1032         }
1033
1034         /* Find the starting point from which to continue scanning */
1035         ssid = wpa_s->conf->ssid;
1036         if (wpa_s->prev_sched_ssid) {
1037                 while (ssid) {
1038                         if (ssid == wpa_s->prev_sched_ssid) {
1039                                 ssid = ssid->next;
1040                                 break;
1041                         }
1042                         ssid = ssid->next;
1043                 }
1044         }
1045
1046         if (!ssid || !wpa_s->prev_sched_ssid) {
1047                 wpa_dbg(wpa_s, MSG_DEBUG, "Beginning of SSID list");
1048                 if (wpa_s->conf->sched_scan_interval)
1049                         wpa_s->sched_scan_interval =
1050                                 wpa_s->conf->sched_scan_interval;
1051                 if (wpa_s->sched_scan_interval == 0)
1052                         wpa_s->sched_scan_interval = 10;
1053                 wpa_s->sched_scan_timeout = max_sched_scan_ssids * 2;
1054                 wpa_s->first_sched_scan = 1;
1055                 ssid = wpa_s->conf->ssid;
1056                 wpa_s->prev_sched_ssid = ssid;
1057         }
1058
1059         if (wildcard) {
1060                 wpa_dbg(wpa_s, MSG_DEBUG, "Add wildcard SSID to sched_scan");
1061                 params.num_ssids++;
1062         }
1063
1064         while (ssid) {
1065                 if (wpas_network_disabled(wpa_s, ssid))
1066                         goto next;
1067
1068                 if (params.num_filter_ssids < wpa_s->max_match_sets &&
1069                     params.filter_ssids && ssid->ssid && ssid->ssid_len) {
1070                         wpa_dbg(wpa_s, MSG_DEBUG, "add to filter ssid: %s",
1071                                 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
1072                         os_memcpy(params.filter_ssids[params.num_filter_ssids].ssid,
1073                                   ssid->ssid, ssid->ssid_len);
1074                         params.filter_ssids[params.num_filter_ssids].ssid_len =
1075                                 ssid->ssid_len;
1076                         params.num_filter_ssids++;
1077                 } else if (params.filter_ssids && ssid->ssid && ssid->ssid_len)
1078                 {
1079                         wpa_dbg(wpa_s, MSG_DEBUG, "Not enough room for SSID "
1080                                 "filter for sched_scan - drop filter");
1081                         os_free(params.filter_ssids);
1082                         params.filter_ssids = NULL;
1083                         params.num_filter_ssids = 0;
1084                 }
1085
1086                 if (ssid->scan_ssid && ssid->ssid && ssid->ssid_len) {
1087                         if (params.num_ssids == max_sched_scan_ssids)
1088                                 break; /* only room for broadcast SSID */
1089                         wpa_dbg(wpa_s, MSG_DEBUG,
1090                                 "add to active scan ssid: %s",
1091                                 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
1092                         params.ssids[params.num_ssids].ssid =
1093                                 ssid->ssid;
1094                         params.ssids[params.num_ssids].ssid_len =
1095                                 ssid->ssid_len;
1096                         params.num_ssids++;
1097                         if (params.num_ssids >= max_sched_scan_ssids) {
1098                                 wpa_s->prev_sched_ssid = ssid;
1099                                 do {
1100                                         ssid = ssid->next;
1101                                 } while (ssid &&
1102                                          (wpas_network_disabled(wpa_s, ssid) ||
1103                                           !ssid->scan_ssid));
1104                                 break;
1105                         }
1106                 }
1107
1108         next:
1109                 wpa_s->prev_sched_ssid = ssid;
1110                 ssid = ssid->next;
1111         }
1112
1113         if (params.num_filter_ssids == 0) {
1114                 os_free(params.filter_ssids);
1115                 params.filter_ssids = NULL;
1116         }
1117
1118         extra_ie = wpa_supplicant_extra_ies(wpa_s);
1119         if (extra_ie) {
1120                 params.extra_ies = wpabuf_head(extra_ie);
1121                 params.extra_ies_len = wpabuf_len(extra_ie);
1122         }
1123
1124         scan_params = &params;
1125
1126 scan:
1127         if (ssid || !wpa_s->first_sched_scan) {
1128                 wpa_dbg(wpa_s, MSG_DEBUG,
1129                         "Starting sched scan: interval %d timeout %d",
1130                         wpa_s->sched_scan_interval, wpa_s->sched_scan_timeout);
1131         } else {
1132                 wpa_dbg(wpa_s, MSG_DEBUG,
1133                         "Starting sched scan: interval %d (no timeout)",
1134                         wpa_s->sched_scan_interval);
1135         }
1136
1137         wpa_setband_scan_freqs(wpa_s, scan_params);
1138
1139         ret = wpa_supplicant_start_sched_scan(wpa_s, scan_params,
1140                                               wpa_s->sched_scan_interval);
1141         wpabuf_free(extra_ie);
1142         os_free(params.filter_ssids);
1143         if (ret) {
1144                 wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate sched scan");
1145                 if (prev_state != wpa_s->wpa_state)
1146                         wpa_supplicant_set_state(wpa_s, prev_state);
1147                 return ret;
1148         }
1149
1150         /* If we have more SSIDs to scan, add a timeout so we scan them too */
1151         if (ssid || !wpa_s->first_sched_scan) {
1152                 wpa_s->sched_scan_timed_out = 0;
1153                 eloop_register_timeout(wpa_s->sched_scan_timeout, 0,
1154                                        wpa_supplicant_sched_scan_timeout,
1155                                        wpa_s, NULL);
1156                 wpa_s->first_sched_scan = 0;
1157                 wpa_s->sched_scan_timeout /= 2;
1158                 wpa_s->sched_scan_interval *= 2;
1159                 if (wpa_s->sched_scan_timeout < wpa_s->sched_scan_interval) {
1160                         wpa_s->sched_scan_interval = 10;
1161                         wpa_s->sched_scan_timeout = max_sched_scan_ssids * 2;
1162                 }
1163         }
1164
1165         /* If there is no more ssids, start next time from the beginning */
1166         if (!ssid)
1167                 wpa_s->prev_sched_ssid = NULL;
1168
1169         return 0;
1170 }
1171
1172
1173 /**
1174  * wpa_supplicant_cancel_scan - Cancel a scheduled scan request
1175  * @wpa_s: Pointer to wpa_supplicant data
1176  *
1177  * This function is used to cancel a scan request scheduled with
1178  * wpa_supplicant_req_scan().
1179  */
1180 void wpa_supplicant_cancel_scan(struct wpa_supplicant *wpa_s)
1181 {
1182         wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling scan request");
1183         eloop_cancel_timeout(wpa_supplicant_scan, wpa_s, NULL);
1184 }
1185
1186
1187 /**
1188  * wpa_supplicant_cancel_delayed_sched_scan - Stop a delayed scheduled scan
1189  * @wpa_s: Pointer to wpa_supplicant data
1190  *
1191  * This function is used to stop a delayed scheduled scan.
1192  */
1193 void wpa_supplicant_cancel_delayed_sched_scan(struct wpa_supplicant *wpa_s)
1194 {
1195         if (!wpa_s->sched_scan_supported)
1196                 return;
1197
1198         wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling delayed sched scan");
1199         eloop_cancel_timeout(wpa_supplicant_delayed_sched_scan_timeout,
1200                              wpa_s, NULL);
1201 }
1202
1203
1204 /**
1205  * wpa_supplicant_cancel_sched_scan - Stop running scheduled scans
1206  * @wpa_s: Pointer to wpa_supplicant data
1207  *
1208  * This function is used to stop a periodic scheduled scan.
1209  */
1210 void wpa_supplicant_cancel_sched_scan(struct wpa_supplicant *wpa_s)
1211 {
1212         if (!wpa_s->sched_scanning)
1213                 return;
1214
1215         wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling sched scan");
1216         eloop_cancel_timeout(wpa_supplicant_sched_scan_timeout, wpa_s, NULL);
1217         wpa_supplicant_stop_sched_scan(wpa_s);
1218 }
1219
1220
1221 /**
1222  * wpa_supplicant_notify_scanning - Indicate possible scan state change
1223  * @wpa_s: Pointer to wpa_supplicant data
1224  * @scanning: Whether scanning is currently in progress
1225  *
1226  * This function is to generate scanning notifycations. It is called whenever
1227  * there may have been a change in scanning (scan started, completed, stopped).
1228  * wpas_notify_scanning() is called whenever the scanning state changed from the
1229  * previously notified state.
1230  */
1231 void wpa_supplicant_notify_scanning(struct wpa_supplicant *wpa_s,
1232                                     int scanning)
1233 {
1234         if (wpa_s->scanning != scanning) {
1235                 wpa_s->scanning = scanning;
1236                 wpas_notify_scanning(wpa_s);
1237         }
1238 }
1239
1240
1241 static int wpa_scan_get_max_rate(const struct wpa_scan_res *res)
1242 {
1243         int rate = 0;
1244         const u8 *ie;
1245         int i;
1246
1247         ie = wpa_scan_get_ie(res, WLAN_EID_SUPP_RATES);
1248         for (i = 0; ie && i < ie[1]; i++) {
1249                 if ((ie[i + 2] & 0x7f) > rate)
1250                         rate = ie[i + 2] & 0x7f;
1251         }
1252
1253         ie = wpa_scan_get_ie(res, WLAN_EID_EXT_SUPP_RATES);
1254         for (i = 0; ie && i < ie[1]; i++) {
1255                 if ((ie[i + 2] & 0x7f) > rate)
1256                         rate = ie[i + 2] & 0x7f;
1257         }
1258
1259         return rate;
1260 }
1261
1262
1263 /**
1264  * wpa_scan_get_ie - Fetch a specified information element from a scan result
1265  * @res: Scan result entry
1266  * @ie: Information element identitifier (WLAN_EID_*)
1267  * Returns: Pointer to the information element (id field) or %NULL if not found
1268  *
1269  * This function returns the first matching information element in the scan
1270  * result.
1271  */
1272 const u8 * wpa_scan_get_ie(const struct wpa_scan_res *res, u8 ie)
1273 {
1274         const u8 *end, *pos;
1275
1276         pos = (const u8 *) (res + 1);
1277         end = pos + res->ie_len;
1278
1279         while (pos + 1 < end) {
1280                 if (pos + 2 + pos[1] > end)
1281                         break;
1282                 if (pos[0] == ie)
1283                         return pos;
1284                 pos += 2 + pos[1];
1285         }
1286
1287         return NULL;
1288 }
1289
1290
1291 /**
1292  * wpa_scan_get_vendor_ie - Fetch vendor information element from a scan result
1293  * @res: Scan result entry
1294  * @vendor_type: Vendor type (four octets starting the IE payload)
1295  * Returns: Pointer to the information element (id field) or %NULL if not found
1296  *
1297  * This function returns the first matching information element in the scan
1298  * result.
1299  */
1300 const u8 * wpa_scan_get_vendor_ie(const struct wpa_scan_res *res,
1301                                   u32 vendor_type)
1302 {
1303         const u8 *end, *pos;
1304
1305         pos = (const u8 *) (res + 1);
1306         end = pos + res->ie_len;
1307
1308         while (pos + 1 < end) {
1309                 if (pos + 2 + pos[1] > end)
1310                         break;
1311                 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1312                     vendor_type == WPA_GET_BE32(&pos[2]))
1313                         return pos;
1314                 pos += 2 + pos[1];
1315         }
1316
1317         return NULL;
1318 }
1319
1320
1321 /**
1322  * wpa_scan_get_vendor_ie_beacon - Fetch vendor information from a scan result
1323  * @res: Scan result entry
1324  * @vendor_type: Vendor type (four octets starting the IE payload)
1325  * Returns: Pointer to the information element (id field) or %NULL if not found
1326  *
1327  * This function returns the first matching information element in the scan
1328  * result.
1329  *
1330  * This function is like wpa_scan_get_vendor_ie(), but uses IE buffer only
1331  * from Beacon frames instead of either Beacon or Probe Response frames.
1332  */
1333 const u8 * wpa_scan_get_vendor_ie_beacon(const struct wpa_scan_res *res,
1334                                          u32 vendor_type)
1335 {
1336         const u8 *end, *pos;
1337
1338         if (res->beacon_ie_len == 0)
1339                 return NULL;
1340
1341         pos = (const u8 *) (res + 1);
1342         pos += res->ie_len;
1343         end = pos + res->beacon_ie_len;
1344
1345         while (pos + 1 < end) {
1346                 if (pos + 2 + pos[1] > end)
1347                         break;
1348                 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1349                     vendor_type == WPA_GET_BE32(&pos[2]))
1350                         return pos;
1351                 pos += 2 + pos[1];
1352         }
1353
1354         return NULL;
1355 }
1356
1357
1358 /**
1359  * wpa_scan_get_vendor_ie_multi - Fetch vendor IE data from a scan result
1360  * @res: Scan result entry
1361  * @vendor_type: Vendor type (four octets starting the IE payload)
1362  * Returns: Pointer to the information element payload or %NULL if not found
1363  *
1364  * This function returns concatenated payload of possibly fragmented vendor
1365  * specific information elements in the scan result. The caller is responsible
1366  * for freeing the returned buffer.
1367  */
1368 struct wpabuf * wpa_scan_get_vendor_ie_multi(const struct wpa_scan_res *res,
1369                                              u32 vendor_type)
1370 {
1371         struct wpabuf *buf;
1372         const u8 *end, *pos;
1373
1374         buf = wpabuf_alloc(res->ie_len);
1375         if (buf == NULL)
1376                 return NULL;
1377
1378         pos = (const u8 *) (res + 1);
1379         end = pos + res->ie_len;
1380
1381         while (pos + 1 < end) {
1382                 if (pos + 2 + pos[1] > end)
1383                         break;
1384                 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1385                     vendor_type == WPA_GET_BE32(&pos[2]))
1386                         wpabuf_put_data(buf, pos + 2 + 4, pos[1] - 4);
1387                 pos += 2 + pos[1];
1388         }
1389
1390         if (wpabuf_len(buf) == 0) {
1391                 wpabuf_free(buf);
1392                 buf = NULL;
1393         }
1394
1395         return buf;
1396 }
1397
1398
1399 /*
1400  * Channels with a great SNR can operate at full rate. What is a great SNR?
1401  * This doc https://supportforums.cisco.com/docs/DOC-12954 says, "the general
1402  * rule of thumb is that any SNR above 20 is good." This one
1403  * http://www.cisco.com/en/US/tech/tk722/tk809/technologies_q_and_a_item09186a00805e9a96.shtml#qa23
1404  * recommends 25 as a minimum SNR for 54 Mbps data rate. 30 is chosen here as a
1405  * conservative value.
1406  */
1407 #define GREAT_SNR 30
1408
1409 /* Compare function for sorting scan results. Return >0 if @b is considered
1410  * better. */
1411 static int wpa_scan_result_compar(const void *a, const void *b)
1412 {
1413 #define IS_5GHZ(n) (n > 4000)
1414 #define MIN(a,b) a < b ? a : b
1415         struct wpa_scan_res **_wa = (void *) a;
1416         struct wpa_scan_res **_wb = (void *) b;
1417         struct wpa_scan_res *wa = *_wa;
1418         struct wpa_scan_res *wb = *_wb;
1419         int wpa_a, wpa_b, maxrate_a, maxrate_b;
1420         int snr_a, snr_b;
1421
1422         /* WPA/WPA2 support preferred */
1423         wpa_a = wpa_scan_get_vendor_ie(wa, WPA_IE_VENDOR_TYPE) != NULL ||
1424                 wpa_scan_get_ie(wa, WLAN_EID_RSN) != NULL;
1425         wpa_b = wpa_scan_get_vendor_ie(wb, WPA_IE_VENDOR_TYPE) != NULL ||
1426                 wpa_scan_get_ie(wb, WLAN_EID_RSN) != NULL;
1427
1428         if (wpa_b && !wpa_a)
1429                 return 1;
1430         if (!wpa_b && wpa_a)
1431                 return -1;
1432
1433         /* privacy support preferred */
1434         if ((wa->caps & IEEE80211_CAP_PRIVACY) == 0 &&
1435             (wb->caps & IEEE80211_CAP_PRIVACY))
1436                 return 1;
1437         if ((wa->caps & IEEE80211_CAP_PRIVACY) &&
1438             (wb->caps & IEEE80211_CAP_PRIVACY) == 0)
1439                 return -1;
1440
1441         if ((wa->flags & wb->flags & WPA_SCAN_LEVEL_DBM) &&
1442             !((wa->flags | wb->flags) & WPA_SCAN_NOISE_INVALID)) {
1443                 snr_a = MIN(wa->level - wa->noise, GREAT_SNR);
1444                 snr_b = MIN(wb->level - wb->noise, GREAT_SNR);
1445         } else {
1446                 /* Not suitable information to calculate SNR, so use level */
1447                 snr_a = wa->level;
1448                 snr_b = wb->level;
1449         }
1450
1451         /* best/max rate preferred if SNR close enough */
1452         if ((snr_a && snr_b && abs(snr_b - snr_a) < 5) ||
1453             (wa->qual && wb->qual && abs(wb->qual - wa->qual) < 10)) {
1454                 maxrate_a = wpa_scan_get_max_rate(wa);
1455                 maxrate_b = wpa_scan_get_max_rate(wb);
1456                 if (maxrate_a != maxrate_b)
1457                         return maxrate_b - maxrate_a;
1458                 if (IS_5GHZ(wa->freq) ^ IS_5GHZ(wb->freq))
1459                         return IS_5GHZ(wa->freq) ? -1 : 1;
1460         }
1461
1462         /* use freq for channel preference */
1463
1464         /* all things being equal, use SNR; if SNRs are
1465          * identical, use quality values since some drivers may only report
1466          * that value and leave the signal level zero */
1467         if (snr_b == snr_a)
1468                 return wb->qual - wa->qual;
1469         return snr_b - snr_a;
1470 #undef MIN
1471 #undef IS_5GHZ
1472 }
1473
1474
1475 #ifdef CONFIG_WPS
1476 /* Compare function for sorting scan results when searching a WPS AP for
1477  * provisioning. Return >0 if @b is considered better. */
1478 static int wpa_scan_result_wps_compar(const void *a, const void *b)
1479 {
1480         struct wpa_scan_res **_wa = (void *) a;
1481         struct wpa_scan_res **_wb = (void *) b;
1482         struct wpa_scan_res *wa = *_wa;
1483         struct wpa_scan_res *wb = *_wb;
1484         int uses_wps_a, uses_wps_b;
1485         struct wpabuf *wps_a, *wps_b;
1486         int res;
1487
1488         /* Optimization - check WPS IE existence before allocated memory and
1489          * doing full reassembly. */
1490         uses_wps_a = wpa_scan_get_vendor_ie(wa, WPS_IE_VENDOR_TYPE) != NULL;
1491         uses_wps_b = wpa_scan_get_vendor_ie(wb, WPS_IE_VENDOR_TYPE) != NULL;
1492         if (uses_wps_a && !uses_wps_b)
1493                 return -1;
1494         if (!uses_wps_a && uses_wps_b)
1495                 return 1;
1496
1497         if (uses_wps_a && uses_wps_b) {
1498                 wps_a = wpa_scan_get_vendor_ie_multi(wa, WPS_IE_VENDOR_TYPE);
1499                 wps_b = wpa_scan_get_vendor_ie_multi(wb, WPS_IE_VENDOR_TYPE);
1500                 res = wps_ap_priority_compar(wps_a, wps_b);
1501                 wpabuf_free(wps_a);
1502                 wpabuf_free(wps_b);
1503                 if (res)
1504                         return res;
1505         }
1506
1507         /*
1508          * Do not use current AP security policy as a sorting criteria during
1509          * WPS provisioning step since the AP may get reconfigured at the
1510          * completion of provisioning.
1511          */
1512
1513         /* all things being equal, use signal level; if signal levels are
1514          * identical, use quality values since some drivers may only report
1515          * that value and leave the signal level zero */
1516         if (wb->level == wa->level)
1517                 return wb->qual - wa->qual;
1518         return wb->level - wa->level;
1519 }
1520 #endif /* CONFIG_WPS */
1521
1522
1523 static void dump_scan_res(struct wpa_scan_results *scan_res)
1524 {
1525 #ifndef CONFIG_NO_STDOUT_DEBUG
1526         size_t i;
1527
1528         if (scan_res->res == NULL || scan_res->num == 0)
1529                 return;
1530
1531         wpa_printf(MSG_EXCESSIVE, "Sorted scan results");
1532
1533         for (i = 0; i < scan_res->num; i++) {
1534                 struct wpa_scan_res *r = scan_res->res[i];
1535                 u8 *pos;
1536                 if ((r->flags & (WPA_SCAN_LEVEL_DBM | WPA_SCAN_NOISE_INVALID))
1537                     == WPA_SCAN_LEVEL_DBM) {
1538                         int snr = r->level - r->noise;
1539                         wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d "
1540                                    "noise=%d level=%d snr=%d%s flags=0x%x "
1541                                    "age=%u",
1542                                    MAC2STR(r->bssid), r->freq, r->qual,
1543                                    r->noise, r->level, snr,
1544                                    snr >= GREAT_SNR ? "*" : "", r->flags,
1545                                    r->age);
1546                 } else {
1547                         wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d "
1548                                    "noise=%d level=%d flags=0x%x age=%u",
1549                                    MAC2STR(r->bssid), r->freq, r->qual,
1550                                    r->noise, r->level, r->flags, r->age);
1551                 }
1552                 pos = (u8 *) (r + 1);
1553                 if (r->ie_len)
1554                         wpa_hexdump(MSG_EXCESSIVE, "IEs", pos, r->ie_len);
1555                 pos += r->ie_len;
1556                 if (r->beacon_ie_len)
1557                         wpa_hexdump(MSG_EXCESSIVE, "Beacon IEs",
1558                                     pos, r->beacon_ie_len);
1559         }
1560 #endif /* CONFIG_NO_STDOUT_DEBUG */
1561 }
1562
1563
1564 /**
1565  * wpa_supplicant_filter_bssid_match - Is the specified BSSID allowed
1566  * @wpa_s: Pointer to wpa_supplicant data
1567  * @bssid: BSSID to check
1568  * Returns: 0 if the BSSID is filtered or 1 if not
1569  *
1570  * This function is used to filter out specific BSSIDs from scan reslts mainly
1571  * for testing purposes (SET bssid_filter ctrl_iface command).
1572  */
1573 int wpa_supplicant_filter_bssid_match(struct wpa_supplicant *wpa_s,
1574                                       const u8 *bssid)
1575 {
1576         size_t i;
1577
1578         if (wpa_s->bssid_filter == NULL)
1579                 return 1;
1580
1581         for (i = 0; i < wpa_s->bssid_filter_count; i++) {
1582                 if (os_memcmp(wpa_s->bssid_filter + i * ETH_ALEN, bssid,
1583                               ETH_ALEN) == 0)
1584                         return 1;
1585         }
1586
1587         return 0;
1588 }
1589
1590
1591 static void filter_scan_res(struct wpa_supplicant *wpa_s,
1592                             struct wpa_scan_results *res)
1593 {
1594         size_t i, j;
1595
1596         if (wpa_s->bssid_filter == NULL)
1597                 return;
1598
1599         for (i = 0, j = 0; i < res->num; i++) {
1600                 if (wpa_supplicant_filter_bssid_match(wpa_s,
1601                                                       res->res[i]->bssid)) {
1602                         res->res[j++] = res->res[i];
1603                 } else {
1604                         os_free(res->res[i]);
1605                         res->res[i] = NULL;
1606                 }
1607         }
1608
1609         if (res->num != j) {
1610                 wpa_printf(MSG_DEBUG, "Filtered out %d scan results",
1611                            (int) (res->num - j));
1612                 res->num = j;
1613         }
1614 }
1615
1616
1617 /**
1618  * wpa_supplicant_get_scan_results - Get scan results
1619  * @wpa_s: Pointer to wpa_supplicant data
1620  * @info: Information about what was scanned or %NULL if not available
1621  * @new_scan: Whether a new scan was performed
1622  * Returns: Scan results, %NULL on failure
1623  *
1624  * This function request the current scan results from the driver and updates
1625  * the local BSS list wpa_s->bss. The caller is responsible for freeing the
1626  * results with wpa_scan_results_free().
1627  */
1628 struct wpa_scan_results *
1629 wpa_supplicant_get_scan_results(struct wpa_supplicant *wpa_s,
1630                                 struct scan_info *info, int new_scan)
1631 {
1632         struct wpa_scan_results *scan_res;
1633         size_t i;
1634         int (*compar)(const void *, const void *) = wpa_scan_result_compar;
1635
1636         scan_res = wpa_drv_get_scan_results2(wpa_s);
1637         if (scan_res == NULL) {
1638                 wpa_dbg(wpa_s, MSG_DEBUG, "Failed to get scan results");
1639                 return NULL;
1640         }
1641         if (scan_res->fetch_time.sec == 0) {
1642                 /*
1643                  * Make sure we have a valid timestamp if the driver wrapper
1644                  * does not set this.
1645                  */
1646                 os_get_reltime(&scan_res->fetch_time);
1647         }
1648         filter_scan_res(wpa_s, scan_res);
1649
1650 #ifdef CONFIG_WPS
1651         if (wpas_wps_searching(wpa_s)) {
1652                 wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Order scan results with WPS "
1653                         "provisioning rules");
1654                 compar = wpa_scan_result_wps_compar;
1655         }
1656 #endif /* CONFIG_WPS */
1657
1658         qsort(scan_res->res, scan_res->num, sizeof(struct wpa_scan_res *),
1659               compar);
1660         dump_scan_res(scan_res);
1661
1662         wpa_bss_update_start(wpa_s);
1663         for (i = 0; i < scan_res->num; i++)
1664                 wpa_bss_update_scan_res(wpa_s, scan_res->res[i],
1665                                         &scan_res->fetch_time);
1666         wpa_bss_update_end(wpa_s, info, new_scan);
1667
1668         return scan_res;
1669 }
1670
1671
1672 /**
1673  * wpa_supplicant_update_scan_results - Update scan results from the driver
1674  * @wpa_s: Pointer to wpa_supplicant data
1675  * Returns: 0 on success, -1 on failure
1676  *
1677  * This function updates the BSS table within wpa_supplicant based on the
1678  * currently available scan results from the driver without requesting a new
1679  * scan. This is used in cases where the driver indicates an association
1680  * (including roaming within ESS) and wpa_supplicant does not yet have the
1681  * needed information to complete the connection (e.g., to perform validation
1682  * steps in 4-way handshake).
1683  */
1684 int wpa_supplicant_update_scan_results(struct wpa_supplicant *wpa_s)
1685 {
1686         struct wpa_scan_results *scan_res;
1687         scan_res = wpa_supplicant_get_scan_results(wpa_s, NULL, 0);
1688         if (scan_res == NULL)
1689                 return -1;
1690         wpa_scan_results_free(scan_res);
1691
1692         return 0;
1693 }
1694
1695
1696 /**
1697  * scan_only_handler - Reports scan results
1698  */
1699 void scan_only_handler(struct wpa_supplicant *wpa_s,
1700                        struct wpa_scan_results *scan_res)
1701 {
1702         wpa_dbg(wpa_s, MSG_DEBUG, "Scan-only results received");
1703         if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
1704             wpa_s->manual_scan_use_id && wpa_s->own_scan_running) {
1705                 wpa_msg_ctrl(wpa_s, MSG_INFO, WPA_EVENT_SCAN_RESULTS "id=%u",
1706                              wpa_s->manual_scan_id);
1707                 wpa_s->manual_scan_use_id = 0;
1708         } else {
1709                 wpa_msg_ctrl(wpa_s, MSG_INFO, WPA_EVENT_SCAN_RESULTS);
1710         }
1711         wpas_notify_scan_results(wpa_s);
1712         wpas_notify_scan_done(wpa_s, 1);
1713         if (wpa_s->scan_work) {
1714                 struct wpa_radio_work *work = wpa_s->scan_work;
1715                 wpa_s->scan_work = NULL;
1716                 radio_work_done(work);
1717         }
1718 }
1719
1720
1721 int wpas_scan_scheduled(struct wpa_supplicant *wpa_s)
1722 {
1723         return eloop_is_timeout_registered(wpa_supplicant_scan, wpa_s, NULL);
1724 }
1725
1726
1727 struct wpa_driver_scan_params *
1728 wpa_scan_clone_params(const struct wpa_driver_scan_params *src)
1729 {
1730         struct wpa_driver_scan_params *params;
1731         size_t i;
1732         u8 *n;
1733
1734         params = os_zalloc(sizeof(*params));
1735         if (params == NULL)
1736                 return NULL;
1737
1738         for (i = 0; i < src->num_ssids; i++) {
1739                 if (src->ssids[i].ssid) {
1740                         n = os_malloc(src->ssids[i].ssid_len);
1741                         if (n == NULL)
1742                                 goto failed;
1743                         os_memcpy(n, src->ssids[i].ssid,
1744                                   src->ssids[i].ssid_len);
1745                         params->ssids[i].ssid = n;
1746                         params->ssids[i].ssid_len = src->ssids[i].ssid_len;
1747                 }
1748         }
1749         params->num_ssids = src->num_ssids;
1750
1751         if (src->extra_ies) {
1752                 n = os_malloc(src->extra_ies_len);
1753                 if (n == NULL)
1754                         goto failed;
1755                 os_memcpy(n, src->extra_ies, src->extra_ies_len);
1756                 params->extra_ies = n;
1757                 params->extra_ies_len = src->extra_ies_len;
1758         }
1759
1760         if (src->freqs) {
1761                 int len = int_array_len(src->freqs);
1762                 params->freqs = os_malloc((len + 1) * sizeof(int));
1763                 if (params->freqs == NULL)
1764                         goto failed;
1765                 os_memcpy(params->freqs, src->freqs, (len + 1) * sizeof(int));
1766         }
1767
1768         if (src->filter_ssids) {
1769                 params->filter_ssids = os_malloc(sizeof(params->filter_ssids) *
1770                                                  src->num_filter_ssids);
1771                 if (params->filter_ssids == NULL)
1772                         goto failed;
1773                 os_memcpy(params->filter_ssids, src->filter_ssids,
1774                           sizeof(params->filter_ssids) * src->num_filter_ssids);
1775                 params->num_filter_ssids = src->num_filter_ssids;
1776         }
1777
1778         params->filter_rssi = src->filter_rssi;
1779         params->p2p_probe = src->p2p_probe;
1780         params->only_new_results = src->only_new_results;
1781
1782         return params;
1783
1784 failed:
1785         wpa_scan_free_params(params);
1786         return NULL;
1787 }
1788
1789
1790 void wpa_scan_free_params(struct wpa_driver_scan_params *params)
1791 {
1792         size_t i;
1793
1794         if (params == NULL)
1795                 return;
1796
1797         for (i = 0; i < params->num_ssids; i++)
1798                 os_free((u8 *) params->ssids[i].ssid);
1799         os_free((u8 *) params->extra_ies);
1800         os_free(params->freqs);
1801         os_free(params->filter_ssids);
1802         os_free(params);
1803 }