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->pno) {
 525                 wpa_dbg(wpa_s, MSG_DEBUG, "Skip scan - PNO is in progress");
 526                 return;
 527         }
 528
 529         if (wpa_s->wpa_state == WPA_INTERFACE_DISABLED) {
 530                 wpa_dbg(wpa_s, MSG_DEBUG, "Skip scan - interface disabled");
 531                 return;
 532         }
 533
 534         if (wpa_s->disconnected && wpa_s->scan_req == NORMAL_SCAN_REQ) {
 535                 wpa_dbg(wpa_s, MSG_DEBUG, "Disconnected - do not scan");
 536                 wpa_supplicant_set_state(wpa_s, WPA_DISCONNECTED);
 537                 return;
 538         }
 539
 540         if (wpa_s->scanning) {
 541                 /*
 542                  * If we are already in scanning state, we shall reschedule the
 543                  * the incoming scan request.
 544                  */
 545                 wpa_dbg(wpa_s, MSG_DEBUG, "Already scanning - Reschedule the incoming scan req");
 546                 wpa_supplicant_req_scan(wpa_s, 1, 0);
 547                 return;
 548         }
 549
 550         if (!wpa_supplicant_enabled_networks(wpa_s) &&
 551             wpa_s->scan_req == NORMAL_SCAN_REQ) {
 552                 wpa_dbg(wpa_s, MSG_DEBUG, "No enabled networks - do not scan");
 553                 wpa_supplicant_set_state(wpa_s, WPA_INACTIVE);
 554                 return;
 555         }
 556
 557         if (wpa_s->conf->ap_scan != 0 &&
 558             (wpa_s->drv_flags & WPA_DRIVER_FLAGS_WIRED)) {
 559                 wpa_dbg(wpa_s, MSG_DEBUG, "Using wired authentication - "
 560                         "overriding ap_scan configuration");
 561                 wpa_s->conf->ap_scan = 0;
 562                 wpas_notify_ap_scan_changed(wpa_s);
 563         }
 564
 565         if (wpa_s->conf->ap_scan == 0) {
 566                 wpa_supplicant_gen_assoc_event(wpa_s);
 567                 return;
 568         }
 569
 570 #ifdef CONFIG_P2P
 571         if (wpas_p2p_in_progress(wpa_s)) {
 572                 wpa_dbg(wpa_s, MSG_DEBUG, "Delay station mode scan while P2P operation is in progress");
 573                 wpa_supplicant_req_scan(wpa_s, 5, 0);
 574                 return;
 575         }
 576 #endif /* CONFIG_P2P */
 577
 578         if (wpa_s->conf->ap_scan == 2)
 579                 max_ssids = 1;
 580         else {
 581                 max_ssids = wpa_s->max_scan_ssids;
 582                 if (max_ssids > WPAS_MAX_SCAN_SSIDS)
 583                         max_ssids = WPAS_MAX_SCAN_SSIDS;
 584         }
 585
 586         wpa_s->last_scan_req = wpa_s->scan_req;
 587         wpa_s->scan_req = NORMAL_SCAN_REQ;
 588
 589         os_memset(&params, 0, sizeof(params));
 590
 591         prev_state = wpa_s->wpa_state;
 592         if (wpa_s->wpa_state == WPA_DISCONNECTED ||
 593             wpa_s->wpa_state == WPA_INACTIVE)
 594                 wpa_supplicant_set_state(wpa_s, WPA_SCANNING);
 595
 596         /*
 597          * If autoscan has set its own scanning parameters
 598          */
 599         if (wpa_s->autoscan_params != NULL) {
 600                 scan_params = wpa_s->autoscan_params;
 601                 goto scan;
 602         }
 603
 604         if (wpa_s->last_scan_req != MANUAL_SCAN_REQ &&
 605             wpa_s->connect_without_scan) {
 606                 for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
 607                         if (ssid == wpa_s->connect_without_scan)
 608                                 break;
 609                 }
 610                 wpa_s->connect_without_scan = NULL;
 611                 if (ssid) {
 612                         wpa_printf(MSG_DEBUG, "Start a pre-selected network "
 613                                    "without scan step");
 614                         wpa_supplicant_associate(wpa_s, NULL, ssid);
 615                         return;
 616                 }
 617         }
 618
 619 #ifdef CONFIG_P2P
 620         if ((wpa_s->p2p_in_provisioning || wpa_s->show_group_started) &&
 621             wpa_s->go_params) {
 622                 wpa_printf(MSG_DEBUG, "P2P: Use specific SSID for scan during P2P group formation (p2p_in_provisioning=%d show_group_started=%d)",
 623                            wpa_s->p2p_in_provisioning,
 624                            wpa_s->show_group_started);
 625                 params.ssids[0].ssid = wpa_s->go_params->ssid;
 626                 params.ssids[0].ssid_len = wpa_s->go_params->ssid_len;
 627                 params.num_ssids = 1;
 628                 goto ssid_list_set;
 629         }
 630 #endif /* CONFIG_P2P */
 631
 632         /* Find the starting point from which to continue scanning */
 633         ssid = wpa_s->conf->ssid;
 634         if (wpa_s->prev_scan_ssid != WILDCARD_SSID_SCAN) {
 635                 while (ssid) {
 636                         if (ssid == wpa_s->prev_scan_ssid) {
 637                                 ssid = ssid->next;
 638                                 break;
 639                         }
 640                         ssid = ssid->next;
 641                 }
 642         }
 643
 644         if (wpa_s->last_scan_req != MANUAL_SCAN_REQ &&
 645             wpa_s->conf->ap_scan == 2) {
 646                 wpa_s->connect_without_scan = NULL;
 647                 wpa_s->prev_scan_wildcard = 0;
 648                 wpa_supplicant_assoc_try(wpa_s, ssid);
 649                 return;
 650         } else if (wpa_s->conf->ap_scan == 2) {
 651                 /*
 652                  * User-initiated scan request in ap_scan == 2; scan with
 653                  * wildcard SSID.
 654                  */
 655                 ssid = NULL;
 656         } else {
 657                 struct wpa_ssid *start = ssid, *tssid;
 658                 int freqs_set = 0;
 659                 if (ssid == NULL && max_ssids > 1)
 660                         ssid = wpa_s->conf->ssid;
 661                 while (ssid) {
 662                         if (!wpas_network_disabled(wpa_s, ssid) &&
 663                             ssid->scan_ssid) {
 664                                 wpa_hexdump_ascii(MSG_DEBUG, "Scan SSID",
 665                                                   ssid->ssid, ssid->ssid_len);
 666                                 params.ssids[params.num_ssids].ssid =
 667                                         ssid->ssid;
 668                                 params.ssids[params.num_ssids].ssid_len =
 669                                         ssid->ssid_len;
 670                                 params.num_ssids++;
 671                                 if (params.num_ssids + 1 >= max_ssids)
 672                                         break;
 673                         }
 674                         ssid = ssid->next;
 675                         if (ssid == start)
 676                                 break;
 677                         if (ssid == NULL && max_ssids > 1 &&
 678                             start != wpa_s->conf->ssid)
 679                                 ssid = wpa_s->conf->ssid;
 680                 }
 681
 682                 for (tssid = wpa_s->conf->ssid; tssid; tssid = tssid->next) {
 683                         if (wpas_network_disabled(wpa_s, tssid))
 684                                 continue;
 685                         if ((params.freqs || !freqs_set) && tssid->scan_freq) {
 686                                 int_array_concat(&params.freqs,
 687                                                  tssid->scan_freq);
 688                         } else {
 689                                 os_free(params.freqs);
 690                                 params.freqs = NULL;
 691                         }
 692                         freqs_set = 1;
 693                 }
 694                 int_array_sort_unique(params.freqs);
 695         }
 696
 697         if (ssid && max_ssids == 1) {
 698                 /*
 699                  * If the driver is limited to 1 SSID at a time interleave
 700                  * wildcard SSID scans with specific SSID scans to avoid
 701                  * waiting a long time for a wildcard scan.
 702                  */
 703                 if (!wpa_s->prev_scan_wildcard) {
 704                         params.ssids[0].ssid = NULL;
 705                         params.ssids[0].ssid_len = 0;
 706                         wpa_s->prev_scan_wildcard = 1;
 707                         wpa_dbg(wpa_s, MSG_DEBUG, "Starting AP scan for "
 708                                 "wildcard SSID (Interleave with specific)");
 709                 } else {
 710                         wpa_s->prev_scan_ssid = ssid;
 711                         wpa_s->prev_scan_wildcard = 0;
 712                         wpa_dbg(wpa_s, MSG_DEBUG,
 713                                 "Starting AP scan for specific SSID: %s",
 714                                 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
 715                 }
 716         } else if (ssid) {
 717                 /* max_ssids > 1 */
 718
 719                 wpa_s->prev_scan_ssid = ssid;
 720                 wpa_dbg(wpa_s, MSG_DEBUG, "Include wildcard SSID in "
 721                         "the scan request");
 722                 params.num_ssids++;
 723         } else if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
 724                    wpa_s->manual_scan_passive && params.num_ssids == 0) {
 725                 wpa_dbg(wpa_s, MSG_DEBUG, "Use passive scan based on manual request");
 726         } else {
 727                 wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
 728                 params.num_ssids++;
 729                 wpa_dbg(wpa_s, MSG_DEBUG, "Starting AP scan for wildcard "
 730                         "SSID");
 731         }
 732 #ifdef CONFIG_P2P
 733 ssid_list_set:
 734 #endif /* CONFIG_P2P */
 735
 736         wpa_supplicant_optimize_freqs(wpa_s, &params);
 737         extra_ie = wpa_supplicant_extra_ies(wpa_s);
 738
 739         if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
 740             wpa_s->manual_scan_only_new)
 741                 params.only_new_results = 1;
 742
 743         if (wpa_s->last_scan_req == MANUAL_SCAN_REQ && params.freqs == NULL &&
 744             wpa_s->manual_scan_freqs) {
 745                 wpa_dbg(wpa_s, MSG_DEBUG, "Limit manual scan to specified channels");
 746                 params.freqs = wpa_s->manual_scan_freqs;
 747                 wpa_s->manual_scan_freqs = NULL;
 748         }
 749
 750         if (params.freqs == NULL && wpa_s->next_scan_freqs) {
 751                 wpa_dbg(wpa_s, MSG_DEBUG, "Optimize scan based on previously "
 752                         "generated frequency list");
 753                 params.freqs = wpa_s->next_scan_freqs;
 754         } else
 755                 os_free(wpa_s->next_scan_freqs);
 756         wpa_s->next_scan_freqs = NULL;
 757         wpa_setband_scan_freqs(wpa_s, &params);
 758
 759         /* See if user specified frequencies. If so, scan only those. */
 760         if (wpa_s->conf->freq_list && !params.freqs) {
 761                 wpa_dbg(wpa_s, MSG_DEBUG,
 762                         "Optimize scan based on conf->freq_list");
 763                 int_array_concat(&params.freqs, wpa_s->conf->freq_list);
 764         }
 765
 766         /* Use current associated channel? */
 767         if (wpa_s->conf->scan_cur_freq && !params.freqs) {
 768                 unsigned int num = wpa_s->num_multichan_concurrent;
 769
 770                 params.freqs = os_calloc(num + 1, sizeof(int));
 771                 if (params.freqs) {
 772                         num = get_shared_radio_freqs(wpa_s, params.freqs, num);
 773                         if (num > 0) {
 774                                 wpa_dbg(wpa_s, MSG_DEBUG, "Scan only the "
 775                                         "current operating channels since "
 776                                         "scan_cur_freq is enabled");
 777                         } else {
 778                                 os_free(params.freqs);
 779                                 params.freqs = NULL;
 780                         }
 781                 }
 782         }
 783
 784         params.filter_ssids = wpa_supplicant_build_filter_ssids(
 785                 wpa_s->conf, &params.num_filter_ssids);
 786         if (extra_ie) {
 787                 params.extra_ies = wpabuf_head(extra_ie);
 788                 params.extra_ies_len = wpabuf_len(extra_ie);
 789         }
 790
 791 #ifdef CONFIG_P2P
 792         if (wpa_s->p2p_in_provisioning ||
 793             (wpa_s->show_group_started && wpa_s->go_params)) {
 794                 /*
 795                  * The interface may not yet be in P2P mode, so we have to
 796                  * explicitly request P2P probe to disable CCK rates.
 797                  */
 798                 params.p2p_probe = 1;
 799         }
 800 #endif /* CONFIG_P2P */
 801
 802         scan_params = &params;
 803
 804 scan:
 805 #ifdef CONFIG_P2P
 806         /*
 807          * If the driver does not support multi-channel concurrency and a
 808          * virtual interface that shares the same radio with the wpa_s interface
 809          * is operating there may not be need to scan other channels apart from
 810          * the current operating channel on the other virtual interface. Filter
 811          * out other channels in case we are trying to find a connection for a
 812          * station interface when we are not configured to prefer station
 813          * connection and a concurrent operation is already in process.
 814          */
 815         if (wpa_s->scan_for_connection &&
 816             wpa_s->last_scan_req == NORMAL_SCAN_REQ &&
 817             !scan_params->freqs && !params.freqs &&
 818             wpas_is_p2p_prioritized(wpa_s) &&
 819             wpa_s->p2p_group_interface == NOT_P2P_GROUP_INTERFACE &&
 820             non_p2p_network_enabled(wpa_s)) {
 821                 unsigned int num = wpa_s->num_multichan_concurrent;
 822
 823                 params.freqs = os_calloc(num + 1, sizeof(int));
 824                 if (params.freqs) {
 825                         num = get_shared_radio_freqs(wpa_s, params.freqs, num);
 826                         if (num > 0 && num == wpa_s->num_multichan_concurrent) {
 827                                 wpa_dbg(wpa_s, MSG_DEBUG, "Scan only the current operating channels since all channels are already used");
 828                         } else {
 829                                 os_free(params.freqs);
 830                                 params.freqs = NULL;
 831                         }
 832                 }
 833         }
 834 #endif /* CONFIG_P2P */
 835
 836         ret = wpa_supplicant_trigger_scan(wpa_s, scan_params);
 837
 838         if (ret && wpa_s->last_scan_req == MANUAL_SCAN_REQ && params.freqs &&
 839             !wpa_s->manual_scan_freqs) {
 840                 /* Restore manual_scan_freqs for the next attempt */
 841                 wpa_s->manual_scan_freqs = params.freqs;
 842                 params.freqs = NULL;
 843         }
 844
 845         wpabuf_free(extra_ie);
 846         os_free(params.freqs);
 847         os_free(params.filter_ssids);
 848
 849         if (ret) {
 850                 wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate AP scan");
 851                 if (prev_state != wpa_s->wpa_state)
 852                         wpa_supplicant_set_state(wpa_s, prev_state);
 853                 /* Restore scan_req since we will try to scan again */
 854                 wpa_s->scan_req = wpa_s->last_scan_req;
 855                 wpa_supplicant_req_scan(wpa_s, 1, 0);
 856         } else {
 857                 wpa_s->scan_for_connection = 0;
 858         }
 859 }
 860
 861
 862 void wpa_supplicant_update_scan_int(struct wpa_supplicant *wpa_s, int sec)
 863 {
 864         struct os_reltime remaining, new_int;
 865         int cancelled;
 866
 867         cancelled = eloop_cancel_timeout_one(wpa_supplicant_scan, wpa_s, NULL,
 868                                              &remaining);
 869
 870         new_int.sec = sec;
 871         new_int.usec = 0;
 872         if (cancelled && os_reltime_before(&remaining, &new_int)) {
 873                 new_int.sec = remaining.sec;
 874                 new_int.usec = remaining.usec;
 875         }
 876
 877         if (cancelled) {
 878                 eloop_register_timeout(new_int.sec, new_int.usec,
 879                                        wpa_supplicant_scan, wpa_s, NULL);
 880         }
 881         wpa_s->scan_interval = sec;
 882 }
 883
 884
 885 /**
 886  * wpa_supplicant_req_scan - Schedule a scan for neighboring access points
 887  * @wpa_s: Pointer to wpa_supplicant data
 888  * @sec: Number of seconds after which to scan
 889  * @usec: Number of microseconds after which to scan
 890  *
 891  * This function is used to schedule a scan for neighboring access points after
 892  * the specified time.
 893  */
 894 void wpa_supplicant_req_scan(struct wpa_supplicant *wpa_s, int sec, int usec)
 895 {
 896         int res = eloop_deplete_timeout(sec, usec, wpa_supplicant_scan, wpa_s,
 897                                         NULL);
 898         if (res == 1) {
 899                 wpa_dbg(wpa_s, MSG_DEBUG, "Rescheduling scan request: %d.%06d sec",
 900                         sec, usec);
 901         } else if (res == 0) {
 902                 wpa_dbg(wpa_s, MSG_DEBUG, "Ignore new scan request for %d.%06d sec since an earlier request is scheduled to trigger sooner",
 903                         sec, usec);
 904         } else {
 905                 wpa_dbg(wpa_s, MSG_DEBUG, "Setting scan request: %d.%06d sec",
 906                         sec, usec);
 907                 eloop_register_timeout(sec, usec, wpa_supplicant_scan, wpa_s, NULL);
 908         }
 909 }
 910
 911
 912 /**
 913  * wpa_supplicant_delayed_sched_scan - Request a delayed scheduled scan
 914  * @wpa_s: Pointer to wpa_supplicant data
 915  * @sec: Number of seconds after which to scan
 916  * @usec: Number of microseconds after which to scan
 917  * Returns: 0 on success or -1 otherwise
 918  *
 919  * This function is used to schedule periodic scans for neighboring
 920  * access points after the specified time.
 921  */
 922 int wpa_supplicant_delayed_sched_scan(struct wpa_supplicant *wpa_s,
 923                                       int sec, int usec)
 924 {
 925         if (!wpa_s->sched_scan_supported)
 926                 return -1;
 927
 928         eloop_register_timeout(sec, usec,
 929                                wpa_supplicant_delayed_sched_scan_timeout,
 930                                wpa_s, NULL);
 931
 932         return 0;
 933 }
 934
 935
 936 /**
 937  * wpa_supplicant_req_sched_scan - Start a periodic scheduled scan
 938  * @wpa_s: Pointer to wpa_supplicant data
 939  * Returns: 0 is sched_scan was started or -1 otherwise
 940  *
 941  * This function is used to schedule periodic scans for neighboring
 942  * access points repeating the scan continuously.
 943  */
 944 int wpa_supplicant_req_sched_scan(struct wpa_supplicant *wpa_s)
 945 {
 946         struct wpa_driver_scan_params params;
 947         struct wpa_driver_scan_params *scan_params;
 948         enum wpa_states prev_state;
 949         struct wpa_ssid *ssid = NULL;
 950         struct wpabuf *extra_ie = NULL;
 951         int ret;
 952         unsigned int max_sched_scan_ssids;
 953         int wildcard = 0;
 954         int need_ssids;
 955
 956         if (!wpa_s->sched_scan_supported)
 957                 return -1;
 958
 959         if (wpa_s->max_sched_scan_ssids > WPAS_MAX_SCAN_SSIDS)
 960                 max_sched_scan_ssids = WPAS_MAX_SCAN_SSIDS;
 961         else
 962                 max_sched_scan_ssids = wpa_s->max_sched_scan_ssids;
 963         if (max_sched_scan_ssids < 1 || wpa_s->conf->disable_scan_offload)
 964                 return -1;
 965
 966         if (wpa_s->sched_scanning) {
 967                 wpa_dbg(wpa_s, MSG_DEBUG, "Already sched scanning");
 968                 return 0;
 969         }
 970
 971         need_ssids = 0;
 972         for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
 973                 if (!wpas_network_disabled(wpa_s, ssid) && !ssid->scan_ssid) {
 974                         /* Use wildcard SSID to find this network */
 975                         wildcard = 1;
 976                 } else if (!wpas_network_disabled(wpa_s, ssid) &&
 977                            ssid->ssid_len)
 978                         need_ssids++;
 979
 980 #ifdef CONFIG_WPS
 981                 if (!wpas_network_disabled(wpa_s, ssid) &&
 982                     ssid->key_mgmt == WPA_KEY_MGMT_WPS) {
 983                         /*
 984                          * Normal scan is more reliable and faster for WPS
 985                          * operations and since these are for short periods of
 986                          * time, the benefit of trying to use sched_scan would
 987                          * be limited.
 988                          */
 989                         wpa_dbg(wpa_s, MSG_DEBUG, "Use normal scan instead of "
 990                                 "sched_scan for WPS");
 991                         return -1;
 992                 }
 993 #endif /* CONFIG_WPS */
 994         }
 995         if (wildcard)
 996                 need_ssids++;
 997
 998         if (wpa_s->normal_scans < 3 &&
 999             (need_ssids <= wpa_s->max_scan_ssids ||
1000              wpa_s->max_scan_ssids >= (int) max_sched_scan_ssids)) {
1001                 /*
1002                  * When normal scan can speed up operations, use that for the
1003                  * first operations before starting the sched_scan to allow
1004                  * user space sleep more. We do this only if the normal scan
1005                  * has functionality that is suitable for this or if the
1006                  * sched_scan does not have better support for multiple SSIDs.
1007                  */
1008                 wpa_dbg(wpa_s, MSG_DEBUG, "Use normal scan instead of "
1009                         "sched_scan for initial scans (normal_scans=%d)",
1010                         wpa_s->normal_scans);
1011                 return -1;
1012         }
1013
1014         os_memset(&params, 0, sizeof(params));
1015
1016         /* If we can't allocate space for the filters, we just don't filter */
1017         params.filter_ssids = os_zalloc(wpa_s->max_match_sets *
1018                                         sizeof(struct wpa_driver_scan_filter));
1019
1020         prev_state = wpa_s->wpa_state;
1021         if (wpa_s->wpa_state == WPA_DISCONNECTED ||
1022             wpa_s->wpa_state == WPA_INACTIVE)
1023                 wpa_supplicant_set_state(wpa_s, WPA_SCANNING);
1024
1025         if (wpa_s->autoscan_params != NULL) {
1026                 scan_params = wpa_s->autoscan_params;
1027                 goto scan;
1028         }
1029
1030         /* Find the starting point from which to continue scanning */
1031         ssid = wpa_s->conf->ssid;
1032         if (wpa_s->prev_sched_ssid) {
1033                 while (ssid) {
1034                         if (ssid == wpa_s->prev_sched_ssid) {
1035                                 ssid = ssid->next;
1036                                 break;
1037                         }
1038                         ssid = ssid->next;
1039                 }
1040         }
1041
1042         if (!ssid || !wpa_s->prev_sched_ssid) {
1043                 wpa_dbg(wpa_s, MSG_DEBUG, "Beginning of SSID list");
1044                 if (wpa_s->conf->sched_scan_interval)
1045                         wpa_s->sched_scan_interval =
1046                                 wpa_s->conf->sched_scan_interval;
1047                 if (wpa_s->sched_scan_interval == 0)
1048                         wpa_s->sched_scan_interval = 10;
1049                 wpa_s->sched_scan_timeout = max_sched_scan_ssids * 2;
1050                 wpa_s->first_sched_scan = 1;
1051                 ssid = wpa_s->conf->ssid;
1052                 wpa_s->prev_sched_ssid = ssid;
1053         }
1054
1055         if (wildcard) {
1056                 wpa_dbg(wpa_s, MSG_DEBUG, "Add wildcard SSID to sched_scan");
1057                 params.num_ssids++;
1058         }
1059
1060         while (ssid) {
1061                 if (wpas_network_disabled(wpa_s, ssid))
1062                         goto next;
1063
1064                 if (params.num_filter_ssids < wpa_s->max_match_sets &&
1065                     params.filter_ssids && ssid->ssid && ssid->ssid_len) {
1066                         wpa_dbg(wpa_s, MSG_DEBUG, "add to filter ssid: %s",
1067                                 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
1068                         os_memcpy(params.filter_ssids[params.num_filter_ssids].ssid,
1069                                   ssid->ssid, ssid->ssid_len);
1070                         params.filter_ssids[params.num_filter_ssids].ssid_len =
1071                                 ssid->ssid_len;
1072                         params.num_filter_ssids++;
1073                 } else if (params.filter_ssids && ssid->ssid && ssid->ssid_len)
1074                 {
1075                         wpa_dbg(wpa_s, MSG_DEBUG, "Not enough room for SSID "
1076                                 "filter for sched_scan - drop filter");
1077                         os_free(params.filter_ssids);
1078                         params.filter_ssids = NULL;
1079                         params.num_filter_ssids = 0;
1080                 }
1081
1082                 if (ssid->scan_ssid && ssid->ssid && ssid->ssid_len) {
1083                         if (params.num_ssids == max_sched_scan_ssids)
1084                                 break; /* only room for broadcast SSID */
1085                         wpa_dbg(wpa_s, MSG_DEBUG,
1086                                 "add to active scan ssid: %s",
1087                                 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
1088                         params.ssids[params.num_ssids].ssid =
1089                                 ssid->ssid;
1090                         params.ssids[params.num_ssids].ssid_len =
1091                                 ssid->ssid_len;
1092                         params.num_ssids++;
1093                         if (params.num_ssids >= max_sched_scan_ssids) {
1094                                 wpa_s->prev_sched_ssid = ssid;
1095                                 do {
1096                                         ssid = ssid->next;
1097                                 } while (ssid &&
1098                                          (wpas_network_disabled(wpa_s, ssid) ||
1099                                           !ssid->scan_ssid));
1100                                 break;
1101                         }
1102                 }
1103
1104         next:
1105                 wpa_s->prev_sched_ssid = ssid;
1106                 ssid = ssid->next;
1107         }
1108
1109         if (params.num_filter_ssids == 0) {
1110                 os_free(params.filter_ssids);
1111                 params.filter_ssids = NULL;
1112         }
1113
1114         extra_ie = wpa_supplicant_extra_ies(wpa_s);
1115         if (extra_ie) {
1116                 params.extra_ies = wpabuf_head(extra_ie);
1117                 params.extra_ies_len = wpabuf_len(extra_ie);
1118         }
1119
1120         scan_params = &params;
1121
1122 scan:
1123         if (ssid || !wpa_s->first_sched_scan) {
1124                 wpa_dbg(wpa_s, MSG_DEBUG,
1125                         "Starting sched scan: interval %d timeout %d",
1126                         wpa_s->sched_scan_interval, wpa_s->sched_scan_timeout);
1127         } else {
1128                 wpa_dbg(wpa_s, MSG_DEBUG,
1129                         "Starting sched scan: interval %d (no timeout)",
1130                         wpa_s->sched_scan_interval);
1131         }
1132
1133         wpa_setband_scan_freqs(wpa_s, scan_params);
1134
1135         ret = wpa_supplicant_start_sched_scan(wpa_s, scan_params,
1136                                               wpa_s->sched_scan_interval);
1137         wpabuf_free(extra_ie);
1138         os_free(params.filter_ssids);
1139         if (ret) {
1140                 wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate sched scan");
1141                 if (prev_state != wpa_s->wpa_state)
1142                         wpa_supplicant_set_state(wpa_s, prev_state);
1143                 return ret;
1144         }
1145
1146         /* If we have more SSIDs to scan, add a timeout so we scan them too */
1147         if (ssid || !wpa_s->first_sched_scan) {
1148                 wpa_s->sched_scan_timed_out = 0;
1149                 eloop_register_timeout(wpa_s->sched_scan_timeout, 0,
1150                                        wpa_supplicant_sched_scan_timeout,
1151                                        wpa_s, NULL);
1152                 wpa_s->first_sched_scan = 0;
1153                 wpa_s->sched_scan_timeout /= 2;
1154                 wpa_s->sched_scan_interval *= 2;
1155                 if (wpa_s->sched_scan_timeout < wpa_s->sched_scan_interval) {
1156                         wpa_s->sched_scan_interval = 10;
1157                         wpa_s->sched_scan_timeout = max_sched_scan_ssids * 2;
1158                 }
1159         }
1160
1161         /* If there is no more ssids, start next time from the beginning */
1162         if (!ssid)
1163                 wpa_s->prev_sched_ssid = NULL;
1164
1165         return 0;
1166 }
1167
1168
1169 /**
1170  * wpa_supplicant_cancel_scan - Cancel a scheduled scan request
1171  * @wpa_s: Pointer to wpa_supplicant data
1172  *
1173  * This function is used to cancel a scan request scheduled with
1174  * wpa_supplicant_req_scan().
1175  */
1176 void wpa_supplicant_cancel_scan(struct wpa_supplicant *wpa_s)
1177 {
1178         wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling scan request");
1179         eloop_cancel_timeout(wpa_supplicant_scan, wpa_s, NULL);
1180 }
1181
1182
1183 /**
1184  * wpa_supplicant_cancel_delayed_sched_scan - Stop a delayed scheduled scan
1185  * @wpa_s: Pointer to wpa_supplicant data
1186  *
1187  * This function is used to stop a delayed scheduled scan.
1188  */
1189 void wpa_supplicant_cancel_delayed_sched_scan(struct wpa_supplicant *wpa_s)
1190 {
1191         if (!wpa_s->sched_scan_supported)
1192                 return;
1193
1194         wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling delayed sched scan");
1195         eloop_cancel_timeout(wpa_supplicant_delayed_sched_scan_timeout,
1196                              wpa_s, NULL);
1197 }
1198
1199
1200 /**
1201  * wpa_supplicant_cancel_sched_scan - Stop running scheduled scans
1202  * @wpa_s: Pointer to wpa_supplicant data
1203  *
1204  * This function is used to stop a periodic scheduled scan.
1205  */
1206 void wpa_supplicant_cancel_sched_scan(struct wpa_supplicant *wpa_s)
1207 {
1208         if (!wpa_s->sched_scanning)
1209                 return;
1210
1211         wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling sched scan");
1212         eloop_cancel_timeout(wpa_supplicant_sched_scan_timeout, wpa_s, NULL);
1213         wpa_supplicant_stop_sched_scan(wpa_s);
1214 }
1215
1216
1217 /**
1218  * wpa_supplicant_notify_scanning - Indicate possible scan state change
1219  * @wpa_s: Pointer to wpa_supplicant data
1220  * @scanning: Whether scanning is currently in progress
1221  *
1222  * This function is to generate scanning notifycations. It is called whenever
1223  * there may have been a change in scanning (scan started, completed, stopped).
1224  * wpas_notify_scanning() is called whenever the scanning state changed from the
1225  * previously notified state.
1226  */
1227 void wpa_supplicant_notify_scanning(struct wpa_supplicant *wpa_s,
1228                                     int scanning)
1229 {
1230         if (wpa_s->scanning != scanning) {
1231                 wpa_s->scanning = scanning;
1232                 wpas_notify_scanning(wpa_s);
1233         }
1234 }
1235
1236
1237 static int wpa_scan_get_max_rate(const struct wpa_scan_res *res)
1238 {
1239         int rate = 0;
1240         const u8 *ie;
1241         int i;
1242
1243         ie = wpa_scan_get_ie(res, WLAN_EID_SUPP_RATES);
1244         for (i = 0; ie && i < ie[1]; i++) {
1245                 if ((ie[i + 2] & 0x7f) > rate)
1246                         rate = ie[i + 2] & 0x7f;
1247         }
1248
1249         ie = wpa_scan_get_ie(res, WLAN_EID_EXT_SUPP_RATES);
1250         for (i = 0; ie && i < ie[1]; i++) {
1251                 if ((ie[i + 2] & 0x7f) > rate)
1252                         rate = ie[i + 2] & 0x7f;
1253         }
1254
1255         return rate;
1256 }
1257
1258
1259 /**
1260  * wpa_scan_get_ie - Fetch a specified information element from a scan result
1261  * @res: Scan result entry
1262  * @ie: Information element identitifier (WLAN_EID_*)
1263  * Returns: Pointer to the information element (id field) or %NULL if not found
1264  *
1265  * This function returns the first matching information element in the scan
1266  * result.
1267  */
1268 const u8 * wpa_scan_get_ie(const struct wpa_scan_res *res, u8 ie)
1269 {
1270         const u8 *end, *pos;
1271
1272         pos = (const u8 *) (res + 1);
1273         end = pos + res->ie_len;
1274
1275         while (pos + 1 < end) {
1276                 if (pos + 2 + pos[1] > end)
1277                         break;
1278                 if (pos[0] == ie)
1279                         return pos;
1280                 pos += 2 + pos[1];
1281         }
1282
1283         return NULL;
1284 }
1285
1286
1287 /**
1288  * wpa_scan_get_vendor_ie - Fetch vendor information element from a scan result
1289  * @res: Scan result entry
1290  * @vendor_type: Vendor type (four octets starting the IE payload)
1291  * Returns: Pointer to the information element (id field) or %NULL if not found
1292  *
1293  * This function returns the first matching information element in the scan
1294  * result.
1295  */
1296 const u8 * wpa_scan_get_vendor_ie(const struct wpa_scan_res *res,
1297                                   u32 vendor_type)
1298 {
1299         const u8 *end, *pos;
1300
1301         pos = (const u8 *) (res + 1);
1302         end = pos + res->ie_len;
1303
1304         while (pos + 1 < end) {
1305                 if (pos + 2 + pos[1] > end)
1306                         break;
1307                 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1308                     vendor_type == WPA_GET_BE32(&pos[2]))
1309                         return pos;
1310                 pos += 2 + pos[1];
1311         }
1312
1313         return NULL;
1314 }
1315
1316
1317 /**
1318  * wpa_scan_get_vendor_ie_beacon - Fetch vendor information from a scan result
1319  * @res: Scan result entry
1320  * @vendor_type: Vendor type (four octets starting the IE payload)
1321  * Returns: Pointer to the information element (id field) or %NULL if not found
1322  *
1323  * This function returns the first matching information element in the scan
1324  * result.
1325  *
1326  * This function is like wpa_scan_get_vendor_ie(), but uses IE buffer only
1327  * from Beacon frames instead of either Beacon or Probe Response frames.
1328  */
1329 const u8 * wpa_scan_get_vendor_ie_beacon(const struct wpa_scan_res *res,
1330                                          u32 vendor_type)
1331 {
1332         const u8 *end, *pos;
1333
1334         if (res->beacon_ie_len == 0)
1335                 return NULL;
1336
1337         pos = (const u8 *) (res + 1);
1338         pos += res->ie_len;
1339         end = pos + res->beacon_ie_len;
1340
1341         while (pos + 1 < end) {
1342                 if (pos + 2 + pos[1] > end)
1343                         break;
1344                 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1345                     vendor_type == WPA_GET_BE32(&pos[2]))
1346                         return pos;
1347                 pos += 2 + pos[1];
1348         }
1349
1350         return NULL;
1351 }
1352
1353
1354 /**
1355  * wpa_scan_get_vendor_ie_multi - Fetch vendor IE data from a scan result
1356  * @res: Scan result entry
1357  * @vendor_type: Vendor type (four octets starting the IE payload)
1358  * Returns: Pointer to the information element payload or %NULL if not found
1359  *
1360  * This function returns concatenated payload of possibly fragmented vendor
1361  * specific information elements in the scan result. The caller is responsible
1362  * for freeing the returned buffer.
1363  */
1364 struct wpabuf * wpa_scan_get_vendor_ie_multi(const struct wpa_scan_res *res,
1365                                              u32 vendor_type)
1366 {
1367         struct wpabuf *buf;
1368         const u8 *end, *pos;
1369
1370         buf = wpabuf_alloc(res->ie_len);
1371         if (buf == NULL)
1372                 return NULL;
1373
1374         pos = (const u8 *) (res + 1);
1375         end = pos + res->ie_len;
1376
1377         while (pos + 1 < end) {
1378                 if (pos + 2 + pos[1] > end)
1379                         break;
1380                 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1381                     vendor_type == WPA_GET_BE32(&pos[2]))
1382                         wpabuf_put_data(buf, pos + 2 + 4, pos[1] - 4);
1383                 pos += 2 + pos[1];
1384         }
1385
1386         if (wpabuf_len(buf) == 0) {
1387                 wpabuf_free(buf);
1388                 buf = NULL;
1389         }
1390
1391         return buf;
1392 }
1393
1394
1395 /*
1396  * Channels with a great SNR can operate at full rate. What is a great SNR?
1397  * This doc https://supportforums.cisco.com/docs/DOC-12954 says, "the general
1398  * rule of thumb is that any SNR above 20 is good." This one
1399  * http://www.cisco.com/en/US/tech/tk722/tk809/technologies_q_and_a_item09186a00805e9a96.shtml#qa23
1400  * recommends 25 as a minimum SNR for 54 Mbps data rate. 30 is chosen here as a
1401  * conservative value.
1402  */
1403 #define GREAT_SNR 30
1404
1405 /* Compare function for sorting scan results. Return >0 if @b is considered
1406  * better. */
1407 static int wpa_scan_result_compar(const void *a, const void *b)
1408 {
1409 #define IS_5GHZ(n) (n > 4000)
1410 #define MIN(a,b) a < b ? a : b
1411         struct wpa_scan_res **_wa = (void *) a;
1412         struct wpa_scan_res **_wb = (void *) b;
1413         struct wpa_scan_res *wa = *_wa;
1414         struct wpa_scan_res *wb = *_wb;
1415         int wpa_a, wpa_b, maxrate_a, maxrate_b;
1416         int snr_a, snr_b;
1417
1418         /* WPA/WPA2 support preferred */
1419         wpa_a = wpa_scan_get_vendor_ie(wa, WPA_IE_VENDOR_TYPE) != NULL ||
1420                 wpa_scan_get_ie(wa, WLAN_EID_RSN) != NULL;
1421         wpa_b = wpa_scan_get_vendor_ie(wb, WPA_IE_VENDOR_TYPE) != NULL ||
1422                 wpa_scan_get_ie(wb, WLAN_EID_RSN) != NULL;
1423
1424         if (wpa_b && !wpa_a)
1425                 return 1;
1426         if (!wpa_b && wpa_a)
1427                 return -1;
1428
1429         /* privacy support preferred */
1430         if ((wa->caps & IEEE80211_CAP_PRIVACY) == 0 &&
1431             (wb->caps & IEEE80211_CAP_PRIVACY))
1432                 return 1;
1433         if ((wa->caps & IEEE80211_CAP_PRIVACY) &&
1434             (wb->caps & IEEE80211_CAP_PRIVACY) == 0)
1435                 return -1;
1436
1437         if ((wa->flags & wb->flags & WPA_SCAN_LEVEL_DBM) &&
1438             !((wa->flags | wb->flags) & WPA_SCAN_NOISE_INVALID)) {
1439                 snr_a = MIN(wa->level - wa->noise, GREAT_SNR);
1440                 snr_b = MIN(wb->level - wb->noise, GREAT_SNR);
1441         } else {
1442                 /* Not suitable information to calculate SNR, so use level */
1443                 snr_a = wa->level;
1444                 snr_b = wb->level;
1445         }
1446
1447         /* best/max rate preferred if SNR close enough */
1448         if ((snr_a && snr_b && abs(snr_b - snr_a) < 5) ||
1449             (wa->qual && wb->qual && abs(wb->qual - wa->qual) < 10)) {
1450                 maxrate_a = wpa_scan_get_max_rate(wa);
1451                 maxrate_b = wpa_scan_get_max_rate(wb);
1452                 if (maxrate_a != maxrate_b)
1453                         return maxrate_b - maxrate_a;
1454                 if (IS_5GHZ(wa->freq) ^ IS_5GHZ(wb->freq))
1455                         return IS_5GHZ(wa->freq) ? -1 : 1;
1456         }
1457
1458         /* use freq for channel preference */
1459
1460         /* all things being equal, use SNR; if SNRs are
1461          * identical, use quality values since some drivers may only report
1462          * that value and leave the signal level zero */
1463         if (snr_b == snr_a)
1464                 return wb->qual - wa->qual;
1465         return snr_b - snr_a;
1466 #undef MIN
1467 #undef IS_5GHZ
1468 }
1469
1470
1471 #ifdef CONFIG_WPS
1472 /* Compare function for sorting scan results when searching a WPS AP for
1473  * provisioning. Return >0 if @b is considered better. */
1474 static int wpa_scan_result_wps_compar(const void *a, const void *b)
1475 {
1476         struct wpa_scan_res **_wa = (void *) a;
1477         struct wpa_scan_res **_wb = (void *) b;
1478         struct wpa_scan_res *wa = *_wa;
1479         struct wpa_scan_res *wb = *_wb;
1480         int uses_wps_a, uses_wps_b;
1481         struct wpabuf *wps_a, *wps_b;
1482         int res;
1483
1484         /* Optimization - check WPS IE existence before allocated memory and
1485          * doing full reassembly. */
1486         uses_wps_a = wpa_scan_get_vendor_ie(wa, WPS_IE_VENDOR_TYPE) != NULL;
1487         uses_wps_b = wpa_scan_get_vendor_ie(wb, WPS_IE_VENDOR_TYPE) != NULL;
1488         if (uses_wps_a && !uses_wps_b)
1489                 return -1;
1490         if (!uses_wps_a && uses_wps_b)
1491                 return 1;
1492
1493         if (uses_wps_a && uses_wps_b) {
1494                 wps_a = wpa_scan_get_vendor_ie_multi(wa, WPS_IE_VENDOR_TYPE);
1495                 wps_b = wpa_scan_get_vendor_ie_multi(wb, WPS_IE_VENDOR_TYPE);
1496                 res = wps_ap_priority_compar(wps_a, wps_b);
1497                 wpabuf_free(wps_a);
1498                 wpabuf_free(wps_b);
1499                 if (res)
1500                         return res;
1501         }
1502
1503         /*
1504          * Do not use current AP security policy as a sorting criteria during
1505          * WPS provisioning step since the AP may get reconfigured at the
1506          * completion of provisioning.
1507          */
1508
1509         /* all things being equal, use signal level; if signal levels are
1510          * identical, use quality values since some drivers may only report
1511          * that value and leave the signal level zero */
1512         if (wb->level == wa->level)
1513                 return wb->qual - wa->qual;
1514         return wb->level - wa->level;
1515 }
1516 #endif /* CONFIG_WPS */
1517
1518
1519 static void dump_scan_res(struct wpa_scan_results *scan_res)
1520 {
1521 #ifndef CONFIG_NO_STDOUT_DEBUG
1522         size_t i;
1523
1524         if (scan_res->res == NULL || scan_res->num == 0)
1525                 return;
1526
1527         wpa_printf(MSG_EXCESSIVE, "Sorted scan results");
1528
1529         for (i = 0; i < scan_res->num; i++) {
1530                 struct wpa_scan_res *r = scan_res->res[i];
1531                 u8 *pos;
1532                 if ((r->flags & (WPA_SCAN_LEVEL_DBM | WPA_SCAN_NOISE_INVALID))
1533                     == WPA_SCAN_LEVEL_DBM) {
1534                         int snr = r->level - r->noise;
1535                         wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d "
1536                                    "noise=%d level=%d snr=%d%s flags=0x%x "
1537                                    "age=%u",
1538                                    MAC2STR(r->bssid), r->freq, r->qual,
1539                                    r->noise, r->level, snr,
1540                                    snr >= GREAT_SNR ? "*" : "", r->flags,
1541                                    r->age);
1542                 } else {
1543                         wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d "
1544                                    "noise=%d level=%d flags=0x%x age=%u",
1545                                    MAC2STR(r->bssid), r->freq, r->qual,
1546                                    r->noise, r->level, r->flags, r->age);
1547                 }
1548                 pos = (u8 *) (r + 1);
1549                 if (r->ie_len)
1550                         wpa_hexdump(MSG_EXCESSIVE, "IEs", pos, r->ie_len);
1551                 pos += r->ie_len;
1552                 if (r->beacon_ie_len)
1553                         wpa_hexdump(MSG_EXCESSIVE, "Beacon IEs",
1554                                     pos, r->beacon_ie_len);
1555         }
1556 #endif /* CONFIG_NO_STDOUT_DEBUG */
1557 }
1558
1559
1560 /**
1561  * wpa_supplicant_filter_bssid_match - Is the specified BSSID allowed
1562  * @wpa_s: Pointer to wpa_supplicant data
1563  * @bssid: BSSID to check
1564  * Returns: 0 if the BSSID is filtered or 1 if not
1565  *
1566  * This function is used to filter out specific BSSIDs from scan reslts mainly
1567  * for testing purposes (SET bssid_filter ctrl_iface command).
1568  */
1569 int wpa_supplicant_filter_bssid_match(struct wpa_supplicant *wpa_s,
1570                                       const u8 *bssid)
1571 {
1572         size_t i;
1573
1574         if (wpa_s->bssid_filter == NULL)
1575                 return 1;
1576
1577         for (i = 0; i < wpa_s->bssid_filter_count; i++) {
1578                 if (os_memcmp(wpa_s->bssid_filter + i * ETH_ALEN, bssid,
1579                               ETH_ALEN) == 0)
1580                         return 1;
1581         }
1582
1583         return 0;
1584 }
1585
1586
1587 static void filter_scan_res(struct wpa_supplicant *wpa_s,
1588                             struct wpa_scan_results *res)
1589 {
1590         size_t i, j;
1591
1592         if (wpa_s->bssid_filter == NULL)
1593                 return;
1594
1595         for (i = 0, j = 0; i < res->num; i++) {
1596                 if (wpa_supplicant_filter_bssid_match(wpa_s,
1597                                                       res->res[i]->bssid)) {
1598                         res->res[j++] = res->res[i];
1599                 } else {
1600                         os_free(res->res[i]);
1601                         res->res[i] = NULL;
1602                 }
1603         }
1604
1605         if (res->num != j) {
1606                 wpa_printf(MSG_DEBUG, "Filtered out %d scan results",
1607                            (int) (res->num - j));
1608                 res->num = j;
1609         }
1610 }
1611
1612
1613 /**
1614  * wpa_supplicant_get_scan_results - Get scan results
1615  * @wpa_s: Pointer to wpa_supplicant data
1616  * @info: Information about what was scanned or %NULL if not available
1617  * @new_scan: Whether a new scan was performed
1618  * Returns: Scan results, %NULL on failure
1619  *
1620  * This function request the current scan results from the driver and updates
1621  * the local BSS list wpa_s->bss. The caller is responsible for freeing the
1622  * results with wpa_scan_results_free().
1623  */
1624 struct wpa_scan_results *
1625 wpa_supplicant_get_scan_results(struct wpa_supplicant *wpa_s,
1626                                 struct scan_info *info, int new_scan)
1627 {
1628         struct wpa_scan_results *scan_res;
1629         size_t i;
1630         int (*compar)(const void *, const void *) = wpa_scan_result_compar;
1631
1632         scan_res = wpa_drv_get_scan_results2(wpa_s);
1633         if (scan_res == NULL) {
1634                 wpa_dbg(wpa_s, MSG_DEBUG, "Failed to get scan results");
1635                 return NULL;
1636         }
1637         if (scan_res->fetch_time.sec == 0) {
1638                 /*
1639                  * Make sure we have a valid timestamp if the driver wrapper
1640                  * does not set this.
1641                  */
1642                 os_get_reltime(&scan_res->fetch_time);
1643         }
1644         filter_scan_res(wpa_s, scan_res);
1645
1646 #ifdef CONFIG_WPS
1647         if (wpas_wps_searching(wpa_s)) {
1648                 wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Order scan results with WPS "
1649                         "provisioning rules");
1650                 compar = wpa_scan_result_wps_compar;
1651         }
1652 #endif /* CONFIG_WPS */
1653
1654         qsort(scan_res->res, scan_res->num, sizeof(struct wpa_scan_res *),
1655               compar);
1656         dump_scan_res(scan_res);
1657
1658         wpa_bss_update_start(wpa_s);
1659         for (i = 0; i < scan_res->num; i++)
1660                 wpa_bss_update_scan_res(wpa_s, scan_res->res[i],
1661                                         &scan_res->fetch_time);
1662         wpa_bss_update_end(wpa_s, info, new_scan);
1663
1664         return scan_res;
1665 }
1666
1667
1668 /**
1669  * wpa_supplicant_update_scan_results - Update scan results from the driver
1670  * @wpa_s: Pointer to wpa_supplicant data
1671  * Returns: 0 on success, -1 on failure
1672  *
1673  * This function updates the BSS table within wpa_supplicant based on the
1674  * currently available scan results from the driver without requesting a new
1675  * scan. This is used in cases where the driver indicates an association
1676  * (including roaming within ESS) and wpa_supplicant does not yet have the
1677  * needed information to complete the connection (e.g., to perform validation
1678  * steps in 4-way handshake).
1679  */
1680 int wpa_supplicant_update_scan_results(struct wpa_supplicant *wpa_s)
1681 {
1682         struct wpa_scan_results *scan_res;
1683         scan_res = wpa_supplicant_get_scan_results(wpa_s, NULL, 0);
1684         if (scan_res == NULL)
1685                 return -1;
1686         wpa_scan_results_free(scan_res);
1687
1688         return 0;
1689 }
1690
1691
1692 /**
1693  * scan_only_handler - Reports scan results
1694  */
1695 void scan_only_handler(struct wpa_supplicant *wpa_s,
1696                        struct wpa_scan_results *scan_res)
1697 {
1698         wpa_dbg(wpa_s, MSG_DEBUG, "Scan-only results received");
1699         if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
1700             wpa_s->manual_scan_use_id && wpa_s->own_scan_running) {
1701                 wpa_msg_ctrl(wpa_s, MSG_INFO, WPA_EVENT_SCAN_RESULTS "id=%u",
1702                              wpa_s->manual_scan_id);
1703                 wpa_s->manual_scan_use_id = 0;
1704         } else {
1705                 wpa_msg_ctrl(wpa_s, MSG_INFO, WPA_EVENT_SCAN_RESULTS);
1706         }
1707         wpas_notify_scan_results(wpa_s);
1708         wpas_notify_scan_done(wpa_s, 1);
1709         if (wpa_s->scan_work) {
1710                 struct wpa_radio_work *work = wpa_s->scan_work;
1711                 wpa_s->scan_work = NULL;
1712                 radio_work_done(work);
1713         }
1714 }
1715
1716
1717 int wpas_scan_scheduled(struct wpa_supplicant *wpa_s)
1718 {
1719         return eloop_is_timeout_registered(wpa_supplicant_scan, wpa_s, NULL);
1720 }
1721
1722
1723 struct wpa_driver_scan_params *
1724 wpa_scan_clone_params(const struct wpa_driver_scan_params *src)
1725 {
1726         struct wpa_driver_scan_params *params;
1727         size_t i;
1728         u8 *n;
1729
1730         params = os_zalloc(sizeof(*params));
1731         if (params == NULL)
1732                 return NULL;
1733
1734         for (i = 0; i < src->num_ssids; i++) {
1735                 if (src->ssids[i].ssid) {
1736                         n = os_malloc(src->ssids[i].ssid_len);
1737                         if (n == NULL)
1738                                 goto failed;
1739                         os_memcpy(n, src->ssids[i].ssid,
1740                                   src->ssids[i].ssid_len);
1741                         params->ssids[i].ssid = n;
1742                         params->ssids[i].ssid_len = src->ssids[i].ssid_len;
1743                 }
1744         }
1745         params->num_ssids = src->num_ssids;
1746
1747         if (src->extra_ies) {
1748                 n = os_malloc(src->extra_ies_len);
1749                 if (n == NULL)
1750                         goto failed;
1751                 os_memcpy(n, src->extra_ies, src->extra_ies_len);
1752                 params->extra_ies = n;
1753                 params->extra_ies_len = src->extra_ies_len;
1754         }
1755
1756         if (src->freqs) {
1757                 int len = int_array_len(src->freqs);
1758                 params->freqs = os_malloc((len + 1) * sizeof(int));
1759                 if (params->freqs == NULL)
1760                         goto failed;
1761                 os_memcpy(params->freqs, src->freqs, (len + 1) * sizeof(int));
1762         }
1763
1764         if (src->filter_ssids) {
1765                 params->filter_ssids = os_malloc(sizeof(params->filter_ssids) *
1766                                                  src->num_filter_ssids);
1767                 if (params->filter_ssids == NULL)
1768                         goto failed;
1769                 os_memcpy(params->filter_ssids, src->filter_ssids,
1770                           sizeof(params->filter_ssids) * src->num_filter_ssids);
1771                 params->num_filter_ssids = src->num_filter_ssids;
1772         }
1773
1774         params->filter_rssi = src->filter_rssi;
1775         params->p2p_probe = src->p2p_probe;
1776         params->only_new_results = src->only_new_results;
1777
1778         return params;
1779
1780 failed:
1781         wpa_scan_free_params(params);
1782         return NULL;
1783 }
1784
1785
1786 void wpa_scan_free_params(struct wpa_driver_scan_params *params)
1787 {
1788         size_t i;
1789
1790         if (params == NULL)
1791                 return;
1792
1793         for (i = 0; i < params->num_ssids; i++)
1794                 os_free((u8 *) params->ssids[i].ssid);
1795         os_free((u8 *) params->extra_ies);
1796         os_free(params->freqs);
1797         os_free(params->filter_ssids);
1798         os_free(params);
1799 }