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                 if (!work->started) {
 152                         wpa_scan_free_params(params);
 153                         return;
 154                 }
 155                 wpa_supplicant_notify_scanning(wpa_s, 0);
 156                 wpas_notify_scan_done(wpa_s, 0);
 157                 wpa_s->scan_work = NULL;
 158                 return;
 159         }
 160
 161         wpa_supplicant_notify_scanning(wpa_s, 1);
 162
 163         if (wpa_s->clear_driver_scan_cache)
 164                 params->only_new_results = 1;
 165         ret = wpa_drv_scan(wpa_s, params);
 166         wpa_scan_free_params(params);
 167         work->ctx = NULL;
 168         if (ret) {
 169                 wpa_supplicant_notify_scanning(wpa_s, 0);
 170                 wpas_notify_scan_done(wpa_s, 0);
 171                 radio_work_done(work);
 172                 return;
 173         }
 174
 175         os_get_reltime(&wpa_s->scan_trigger_time);
 176         wpa_s->scan_runs++;
 177         wpa_s->normal_scans++;
 178         wpa_s->own_scan_requested = 1;
 179         wpa_s->clear_driver_scan_cache = 0;
 180         wpa_s->scan_work = work;
 181 }
 182
 183
 184 /**
 185  * wpa_supplicant_trigger_scan - Request driver to start a scan
 186  * @wpa_s: Pointer to wpa_supplicant data
 187  * @params: Scan parameters
 188  * Returns: 0 on success, -1 on failure
 189  */
 190 int wpa_supplicant_trigger_scan(struct wpa_supplicant *wpa_s,
 191                                 struct wpa_driver_scan_params *params)
 192 {
 193         struct wpa_driver_scan_params *ctx;
 194
 195         if (wpa_s->scan_work) {
 196                 wpa_dbg(wpa_s, MSG_INFO, "Reject scan trigger since one is already pending");
 197                 return -1;
 198         }
 199
 200         ctx = wpa_scan_clone_params(params);
 201         if (ctx == NULL)
 202                 return -1;
 203
 204         if (radio_add_work(wpa_s, 0, "scan", 0, wpas_trigger_scan_cb, ctx) < 0)
 205         {
 206                 wpa_scan_free_params(ctx);
 207                 return -1;
 208         }
 209
 210         return 0;
 211 }
 212
 213
 214 static void
 215 wpa_supplicant_delayed_sched_scan_timeout(void *eloop_ctx, void *timeout_ctx)
 216 {
 217         struct wpa_supplicant *wpa_s = eloop_ctx;
 218
 219         wpa_dbg(wpa_s, MSG_DEBUG, "Starting delayed sched scan");
 220
 221         if (wpa_supplicant_req_sched_scan(wpa_s))
 222                 wpa_supplicant_req_scan(wpa_s, 0, 0);
 223 }
 224
 225
 226 static void
 227 wpa_supplicant_sched_scan_timeout(void *eloop_ctx, void *timeout_ctx)
 228 {
 229         struct wpa_supplicant *wpa_s = eloop_ctx;
 230
 231         wpa_dbg(wpa_s, MSG_DEBUG, "Sched scan timeout - stopping it");
 232
 233         wpa_s->sched_scan_timed_out = 1;
 234         wpa_supplicant_cancel_sched_scan(wpa_s);
 235 }
 236
 237
 238 int wpa_supplicant_start_sched_scan(struct wpa_supplicant *wpa_s,
 239                                     struct wpa_driver_scan_params *params,
 240                                     int interval)
 241 {
 242         int ret;
 243
 244         wpa_supplicant_notify_scanning(wpa_s, 1);
 245         ret = wpa_drv_sched_scan(wpa_s, params, interval * 1000);
 246         if (ret)
 247                 wpa_supplicant_notify_scanning(wpa_s, 0);
 248         else
 249                 wpa_s->sched_scanning = 1;
 250
 251         return ret;
 252 }
 253
 254
 255 int wpa_supplicant_stop_sched_scan(struct wpa_supplicant *wpa_s)
 256 {
 257         int ret;
 258
 259         ret = wpa_drv_stop_sched_scan(wpa_s);
 260         if (ret) {
 261                 wpa_dbg(wpa_s, MSG_DEBUG, "stopping sched_scan failed!");
 262                 /* TODO: what to do if stopping fails? */
 263                 return -1;
 264         }
 265
 266         return ret;
 267 }
 268
 269
 270 static struct wpa_driver_scan_filter *
 271 wpa_supplicant_build_filter_ssids(struct wpa_config *conf, size_t *num_ssids)
 272 {
 273         struct wpa_driver_scan_filter *ssids;
 274         struct wpa_ssid *ssid;
 275         size_t count;
 276
 277         *num_ssids = 0;
 278         if (!conf->filter_ssids)
 279                 return NULL;
 280
 281         for (count = 0, ssid = conf->ssid; ssid; ssid = ssid->next) {
 282                 if (ssid->ssid && ssid->ssid_len)
 283                         count++;
 284         }
 285         if (count == 0)
 286                 return NULL;
 287         ssids = os_zalloc(count * sizeof(struct wpa_driver_scan_filter));
 288         if (ssids == NULL)
 289                 return NULL;
 290
 291         for (ssid = conf->ssid; ssid; ssid = ssid->next) {
 292                 if (!ssid->ssid || !ssid->ssid_len)
 293                         continue;
 294                 os_memcpy(ssids[*num_ssids].ssid, ssid->ssid, ssid->ssid_len);
 295                 ssids[*num_ssids].ssid_len = ssid->ssid_len;
 296                 (*num_ssids)++;
 297         }
 298
 299         return ssids;
 300 }
 301
 302
 303 static void wpa_supplicant_optimize_freqs(
 304         struct wpa_supplicant *wpa_s, struct wpa_driver_scan_params *params)
 305 {
 306 #ifdef CONFIG_P2P
 307         if (params->freqs == NULL && wpa_s->p2p_in_provisioning &&
 308             wpa_s->go_params) {
 309                 /* Optimize provisioning state scan based on GO information */
 310                 if (wpa_s->p2p_in_provisioning < 5 &&
 311                     wpa_s->go_params->freq > 0) {
 312                         wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only GO "
 313                                 "preferred frequency %d MHz",
 314                                 wpa_s->go_params->freq);
 315                         params->freqs = os_zalloc(2 * sizeof(int));
 316                         if (params->freqs)
 317                                 params->freqs[0] = wpa_s->go_params->freq;
 318                 } else if (wpa_s->p2p_in_provisioning < 8 &&
 319                            wpa_s->go_params->freq_list[0]) {
 320                         wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only common "
 321                                 "channels");
 322                         int_array_concat(&params->freqs,
 323                                          wpa_s->go_params->freq_list);
 324                         if (params->freqs)
 325                                 int_array_sort_unique(params->freqs);
 326                 }
 327                 wpa_s->p2p_in_provisioning++;
 328         }
 329 #endif /* CONFIG_P2P */
 330
 331 #ifdef CONFIG_WPS
 332         if (params->freqs == NULL && wpa_s->after_wps && wpa_s->wps_freq) {
 333                 /*
 334                  * Optimize post-provisioning scan based on channel used
 335                  * during provisioning.
 336                  */
 337                 wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Scan only frequency %u MHz "
 338                         "that was used during provisioning", wpa_s->wps_freq);
 339                 params->freqs = os_zalloc(2 * sizeof(int));
 340                 if (params->freqs)
 341                         params->freqs[0] = wpa_s->wps_freq;
 342                 wpa_s->after_wps--;
 343         } else if (wpa_s->after_wps)
 344                 wpa_s->after_wps--;
 345
 346         if (params->freqs == NULL && wpa_s->known_wps_freq && wpa_s->wps_freq)
 347         {
 348                 /* Optimize provisioning scan based on already known channel */
 349                 wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Scan only frequency %u MHz",
 350                         wpa_s->wps_freq);
 351                 params->freqs = os_zalloc(2 * sizeof(int));
 352                 if (params->freqs)
 353                         params->freqs[0] = wpa_s->wps_freq;
 354                 wpa_s->known_wps_freq = 0; /* only do this once */
 355         }
 356 #endif /* CONFIG_WPS */
 357 }
 358
 359
 360 #ifdef CONFIG_INTERWORKING
 361 static void wpas_add_interworking_elements(struct wpa_supplicant *wpa_s,
 362                                            struct wpabuf *buf)
 363 {
 364         if (wpa_s->conf->interworking == 0)
 365                 return;
 366
 367         wpabuf_put_u8(buf, WLAN_EID_EXT_CAPAB);
 368         wpabuf_put_u8(buf, 4);
 369         wpabuf_put_u8(buf, 0x00);
 370         wpabuf_put_u8(buf, 0x00);
 371         wpabuf_put_u8(buf, 0x00);
 372         wpabuf_put_u8(buf, 0x80); /* Bit 31 - Interworking */
 373
 374         wpabuf_put_u8(buf, WLAN_EID_INTERWORKING);
 375         wpabuf_put_u8(buf, is_zero_ether_addr(wpa_s->conf->hessid) ? 1 :
 376                       1 + ETH_ALEN);
 377         wpabuf_put_u8(buf, wpa_s->conf->access_network_type);
 378         /* No Venue Info */
 379         if (!is_zero_ether_addr(wpa_s->conf->hessid))
 380                 wpabuf_put_data(buf, wpa_s->conf->hessid, ETH_ALEN);
 381 }
 382 #endif /* CONFIG_INTERWORKING */
 383
 384
 385 static struct wpabuf * wpa_supplicant_extra_ies(struct wpa_supplicant *wpa_s)
 386 {
 387         struct wpabuf *extra_ie = NULL;
 388 #ifdef CONFIG_WPS
 389         int wps = 0;
 390         enum wps_request_type req_type = WPS_REQ_ENROLLEE_INFO;
 391 #endif /* CONFIG_WPS */
 392
 393 #ifdef CONFIG_INTERWORKING
 394         if (wpa_s->conf->interworking &&
 395             wpabuf_resize(&extra_ie, 100) == 0)
 396                 wpas_add_interworking_elements(wpa_s, extra_ie);
 397 #endif /* CONFIG_INTERWORKING */
 398
 399 #ifdef CONFIG_WPS
 400         wps = wpas_wps_in_use(wpa_s, &req_type);
 401
 402         if (wps) {
 403                 struct wpabuf *wps_ie;
 404                 wps_ie = wps_build_probe_req_ie(wps == 2 ? DEV_PW_PUSHBUTTON :
 405                                                 DEV_PW_DEFAULT,
 406                                                 &wpa_s->wps->dev,
 407                                                 wpa_s->wps->uuid, req_type,
 408                                                 0, NULL);
 409                 if (wps_ie) {
 410                         if (wpabuf_resize(&extra_ie, wpabuf_len(wps_ie)) == 0)
 411                                 wpabuf_put_buf(extra_ie, wps_ie);
 412                         wpabuf_free(wps_ie);
 413                 }
 414         }
 415
 416 #ifdef CONFIG_P2P
 417         if (wps) {
 418                 size_t ielen = p2p_scan_ie_buf_len(wpa_s->global->p2p);
 419                 if (wpabuf_resize(&extra_ie, ielen) == 0)
 420                         wpas_p2p_scan_ie(wpa_s, extra_ie);
 421         }
 422 #endif /* CONFIG_P2P */
 423
 424 #endif /* CONFIG_WPS */
 425
 426 #ifdef CONFIG_HS20
 427         if (wpa_s->conf->hs20 && wpabuf_resize(&extra_ie, 7) == 0)
 428                 wpas_hs20_add_indication(extra_ie);
 429 #endif /* CONFIG_HS20 */
 430
 431         return extra_ie;
 432 }
 433
 434
 435 #ifdef CONFIG_P2P
 436
 437 /*
 438  * Check whether there are any enabled networks or credentials that could be
 439  * used for a non-P2P connection.
 440  */
 441 static int non_p2p_network_enabled(struct wpa_supplicant *wpa_s)
 442 {
 443         struct wpa_ssid *ssid;
 444
 445         for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
 446                 if (wpas_network_disabled(wpa_s, ssid))
 447                         continue;
 448                 if (!ssid->p2p_group)
 449                         return 1;
 450         }
 451
 452         if (wpa_s->conf->cred && wpa_s->conf->interworking &&
 453             wpa_s->conf->auto_interworking)
 454                 return 1;
 455
 456         return 0;
 457 }
 458
 459 #endif /* CONFIG_P2P */
 460
 461
 462 static struct hostapd_hw_modes * get_mode(struct hostapd_hw_modes *modes,
 463                                           u16 num_modes,
 464                                           enum hostapd_hw_mode mode)
 465 {
 466         u16 i;
 467
 468         for (i = 0; i < num_modes; i++) {
 469                 if (modes[i].mode == mode)
 470                         return &modes[i];
 471         }
 472
 473         return NULL;
 474 }
 475
 476
 477 static void wpa_setband_scan_freqs_list(struct wpa_supplicant *wpa_s,
 478                                         enum hostapd_hw_mode band,
 479                                         struct wpa_driver_scan_params *params)
 480 {
 481         /* Include only supported channels for the specified band */
 482         struct hostapd_hw_modes *mode;
 483         int count, i;
 484
 485         mode = get_mode(wpa_s->hw.modes, wpa_s->hw.num_modes, band);
 486         if (mode == NULL) {
 487                 /* No channels supported in this band - use empty list */
 488                 params->freqs = os_zalloc(sizeof(int));
 489                 return;
 490         }
 491
 492         params->freqs = os_zalloc((mode->num_channels + 1) * sizeof(int));
 493         if (params->freqs == NULL)
 494                 return;
 495         for (count = 0, i = 0; i < mode->num_channels; i++) {
 496                 if (mode->channels[i].flag & HOSTAPD_CHAN_DISABLED)
 497                         continue;
 498                 params->freqs[count++] = mode->channels[i].freq;
 499         }
 500 }
 501
 502
 503 static void wpa_setband_scan_freqs(struct wpa_supplicant *wpa_s,
 504                                    struct wpa_driver_scan_params *params)
 505 {
 506         if (wpa_s->hw.modes == NULL)
 507                 return; /* unknown what channels the driver supports */
 508         if (params->freqs)
 509                 return; /* already using a limited channel set */
 510         if (wpa_s->setband == WPA_SETBAND_5G)
 511                 wpa_setband_scan_freqs_list(wpa_s, HOSTAPD_MODE_IEEE80211A,
 512                                             params);
 513         else if (wpa_s->setband == WPA_SETBAND_2G)
 514                 wpa_setband_scan_freqs_list(wpa_s, HOSTAPD_MODE_IEEE80211G,
 515                                             params);
 516 }
 517
 518
 519 static void wpa_supplicant_scan(void *eloop_ctx, void *timeout_ctx)
 520 {
 521         struct wpa_supplicant *wpa_s = eloop_ctx;
 522         struct wpa_ssid *ssid;
 523         int ret;
 524         struct wpabuf *extra_ie = NULL;
 525         struct wpa_driver_scan_params params;
 526         struct wpa_driver_scan_params *scan_params;
 527         size_t max_ssids;
 528         enum wpa_states prev_state;
 529
 530         if (wpa_s->pno || wpa_s->pno_sched_pending) {
 531                 wpa_dbg(wpa_s, MSG_DEBUG, "Skip scan - PNO is in progress");
 532                 return;
 533         }
 534
 535         if (wpa_s->wpa_state == WPA_INTERFACE_DISABLED) {
 536                 wpa_dbg(wpa_s, MSG_DEBUG, "Skip scan - interface disabled");
 537                 return;
 538         }
 539
 540         if (wpa_s->disconnected && wpa_s->scan_req == NORMAL_SCAN_REQ) {
 541                 wpa_dbg(wpa_s, MSG_DEBUG, "Disconnected - do not scan");
 542                 wpa_supplicant_set_state(wpa_s, WPA_DISCONNECTED);
 543                 return;
 544         }
 545
 546         if (wpa_s->scanning) {
 547                 /*
 548                  * If we are already in scanning state, we shall reschedule the
 549                  * the incoming scan request.
 550                  */
 551                 wpa_dbg(wpa_s, MSG_DEBUG, "Already scanning - Reschedule the incoming scan req");
 552                 wpa_supplicant_req_scan(wpa_s, 1, 0);
 553                 return;
 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)) {
 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         int res = eloop_deplete_timeout(sec, usec, wpa_supplicant_scan, wpa_s,
 903                                         NULL);
 904         if (res == 1) {
 905                 wpa_dbg(wpa_s, MSG_DEBUG, "Rescheduling scan request: %d.%06d sec",
 906                         sec, usec);
 907         } else if (res == 0) {
 908                 wpa_dbg(wpa_s, MSG_DEBUG, "Ignore new scan request for %d.%06d sec since an earlier request is scheduled to trigger sooner",
 909                         sec, usec);
 910         } else {
 911                 wpa_dbg(wpa_s, MSG_DEBUG, "Setting scan request: %d.%06d sec",
 912                         sec, usec);
 913                 eloop_register_timeout(sec, usec, wpa_supplicant_scan, wpa_s, NULL);
 914         }
 915 }
 916
 917
 918 /**
 919  * wpa_supplicant_delayed_sched_scan - Request a delayed scheduled scan
 920  * @wpa_s: Pointer to wpa_supplicant data
 921  * @sec: Number of seconds after which to scan
 922  * @usec: Number of microseconds after which to scan
 923  * Returns: 0 on success or -1 otherwise
 924  *
 925  * This function is used to schedule periodic scans for neighboring
 926  * access points after the specified time.
 927  */
 928 int wpa_supplicant_delayed_sched_scan(struct wpa_supplicant *wpa_s,
 929                                       int sec, int usec)
 930 {
 931         if (!wpa_s->sched_scan_supported)
 932                 return -1;
 933
 934         eloop_register_timeout(sec, usec,
 935                                wpa_supplicant_delayed_sched_scan_timeout,
 936                                wpa_s, NULL);
 937
 938         return 0;
 939 }
 940
 941
 942 /**
 943  * wpa_supplicant_req_sched_scan - Start a periodic scheduled scan
 944  * @wpa_s: Pointer to wpa_supplicant data
 945  * Returns: 0 is sched_scan was started or -1 otherwise
 946  *
 947  * This function is used to schedule periodic scans for neighboring
 948  * access points repeating the scan continuously.
 949  */
 950 int wpa_supplicant_req_sched_scan(struct wpa_supplicant *wpa_s)
 951 {
 952         struct wpa_driver_scan_params params;
 953         struct wpa_driver_scan_params *scan_params;
 954         enum wpa_states prev_state;
 955         struct wpa_ssid *ssid = NULL;
 956         struct wpabuf *extra_ie = NULL;
 957         int ret;
 958         unsigned int max_sched_scan_ssids;
 959         int wildcard = 0;
 960         int need_ssids;
 961
 962         if (!wpa_s->sched_scan_supported)
 963                 return -1;
 964
 965         if (wpa_s->max_sched_scan_ssids > WPAS_MAX_SCAN_SSIDS)
 966                 max_sched_scan_ssids = WPAS_MAX_SCAN_SSIDS;
 967         else
 968                 max_sched_scan_ssids = wpa_s->max_sched_scan_ssids;
 969         if (max_sched_scan_ssids < 1 || wpa_s->conf->disable_scan_offload)
 970                 return -1;
 971
 972         if (wpa_s->sched_scanning) {
 973                 wpa_dbg(wpa_s, MSG_DEBUG, "Already sched scanning");
 974                 return 0;
 975         }
 976
 977         need_ssids = 0;
 978         for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
 979                 if (!wpas_network_disabled(wpa_s, ssid) && !ssid->scan_ssid) {
 980                         /* Use wildcard SSID to find this network */
 981                         wildcard = 1;
 982                 } else if (!wpas_network_disabled(wpa_s, ssid) &&
 983                            ssid->ssid_len)
 984                         need_ssids++;
 985
 986 #ifdef CONFIG_WPS
 987                 if (!wpas_network_disabled(wpa_s, ssid) &&
 988                     ssid->key_mgmt == WPA_KEY_MGMT_WPS) {
 989                         /*
 990                          * Normal scan is more reliable and faster for WPS
 991                          * operations and since these are for short periods of
 992                          * time, the benefit of trying to use sched_scan would
 993                          * be limited.
 994                          */
 995                         wpa_dbg(wpa_s, MSG_DEBUG, "Use normal scan instead of "
 996                                 "sched_scan for WPS");
 997                         return -1;
 998                 }
 999 #endif /* CONFIG_WPS */
1000         }
1001         if (wildcard)
1002                 need_ssids++;
1003
1004         if (wpa_s->normal_scans < 3 &&
1005             (need_ssids <= wpa_s->max_scan_ssids ||
1006              wpa_s->max_scan_ssids >= (int) max_sched_scan_ssids)) {
1007                 /*
1008                  * When normal scan can speed up operations, use that for the
1009                  * first operations before starting the sched_scan to allow
1010                  * user space sleep more. We do this only if the normal scan
1011                  * has functionality that is suitable for this or if the
1012                  * sched_scan does not have better support for multiple SSIDs.
1013                  */
1014                 wpa_dbg(wpa_s, MSG_DEBUG, "Use normal scan instead of "
1015                         "sched_scan for initial scans (normal_scans=%d)",
1016                         wpa_s->normal_scans);
1017                 return -1;
1018         }
1019
1020         os_memset(&params, 0, sizeof(params));
1021
1022         /* If we can't allocate space for the filters, we just don't filter */
1023         params.filter_ssids = os_zalloc(wpa_s->max_match_sets *
1024                                         sizeof(struct wpa_driver_scan_filter));
1025
1026         prev_state = wpa_s->wpa_state;
1027         if (wpa_s->wpa_state == WPA_DISCONNECTED ||
1028             wpa_s->wpa_state == WPA_INACTIVE)
1029                 wpa_supplicant_set_state(wpa_s, WPA_SCANNING);
1030
1031         if (wpa_s->autoscan_params != NULL) {
1032                 scan_params = wpa_s->autoscan_params;
1033                 goto scan;
1034         }
1035
1036         /* Find the starting point from which to continue scanning */
1037         ssid = wpa_s->conf->ssid;
1038         if (wpa_s->prev_sched_ssid) {
1039                 while (ssid) {
1040                         if (ssid == wpa_s->prev_sched_ssid) {
1041                                 ssid = ssid->next;
1042                                 break;
1043                         }
1044                         ssid = ssid->next;
1045                 }
1046         }
1047
1048         if (!ssid || !wpa_s->prev_sched_ssid) {
1049                 wpa_dbg(wpa_s, MSG_DEBUG, "Beginning of SSID list");
1050                 if (wpa_s->conf->sched_scan_interval)
1051                         wpa_s->sched_scan_interval =
1052                                 wpa_s->conf->sched_scan_interval;
1053                 if (wpa_s->sched_scan_interval == 0)
1054                         wpa_s->sched_scan_interval = 10;
1055                 wpa_s->sched_scan_timeout = max_sched_scan_ssids * 2;
1056                 wpa_s->first_sched_scan = 1;
1057                 ssid = wpa_s->conf->ssid;
1058                 wpa_s->prev_sched_ssid = ssid;
1059         }
1060
1061         if (wildcard) {
1062                 wpa_dbg(wpa_s, MSG_DEBUG, "Add wildcard SSID to sched_scan");
1063                 params.num_ssids++;
1064         }
1065
1066         while (ssid) {
1067                 if (wpas_network_disabled(wpa_s, ssid))
1068                         goto next;
1069
1070                 if (params.num_filter_ssids < wpa_s->max_match_sets &&
1071                     params.filter_ssids && ssid->ssid && ssid->ssid_len) {
1072                         wpa_dbg(wpa_s, MSG_DEBUG, "add to filter ssid: %s",
1073                                 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
1074                         os_memcpy(params.filter_ssids[params.num_filter_ssids].ssid,
1075                                   ssid->ssid, ssid->ssid_len);
1076                         params.filter_ssids[params.num_filter_ssids].ssid_len =
1077                                 ssid->ssid_len;
1078                         params.num_filter_ssids++;
1079                 } else if (params.filter_ssids && ssid->ssid && ssid->ssid_len)
1080                 {
1081                         wpa_dbg(wpa_s, MSG_DEBUG, "Not enough room for SSID "
1082                                 "filter for sched_scan - drop filter");
1083                         os_free(params.filter_ssids);
1084                         params.filter_ssids = NULL;
1085                         params.num_filter_ssids = 0;
1086                 }
1087
1088                 if (ssid->scan_ssid && ssid->ssid && ssid->ssid_len) {
1089                         if (params.num_ssids == max_sched_scan_ssids)
1090                                 break; /* only room for broadcast SSID */
1091                         wpa_dbg(wpa_s, MSG_DEBUG,
1092                                 "add to active scan ssid: %s",
1093                                 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
1094                         params.ssids[params.num_ssids].ssid =
1095                                 ssid->ssid;
1096                         params.ssids[params.num_ssids].ssid_len =
1097                                 ssid->ssid_len;
1098                         params.num_ssids++;
1099                         if (params.num_ssids >= max_sched_scan_ssids) {
1100                                 wpa_s->prev_sched_ssid = ssid;
1101                                 do {
1102                                         ssid = ssid->next;
1103                                 } while (ssid &&
1104                                          (wpas_network_disabled(wpa_s, ssid) ||
1105                                           !ssid->scan_ssid));
1106                                 break;
1107                         }
1108                 }
1109
1110         next:
1111                 wpa_s->prev_sched_ssid = ssid;
1112                 ssid = ssid->next;
1113         }
1114
1115         if (params.num_filter_ssids == 0) {
1116                 os_free(params.filter_ssids);
1117                 params.filter_ssids = NULL;
1118         }
1119
1120         extra_ie = wpa_supplicant_extra_ies(wpa_s);
1121         if (extra_ie) {
1122                 params.extra_ies = wpabuf_head(extra_ie);
1123                 params.extra_ies_len = wpabuf_len(extra_ie);
1124         }
1125
1126         if (wpa_s->conf->filter_rssi)
1127                 params.filter_rssi = wpa_s->conf->filter_rssi;
1128
1129         scan_params = &params;
1130
1131 scan:
1132         if (ssid || !wpa_s->first_sched_scan) {
1133                 wpa_dbg(wpa_s, MSG_DEBUG,
1134                         "Starting sched scan: interval %d timeout %d",
1135                         wpa_s->sched_scan_interval, wpa_s->sched_scan_timeout);
1136         } else {
1137                 wpa_dbg(wpa_s, MSG_DEBUG,
1138                         "Starting sched scan: interval %d (no timeout)",
1139                         wpa_s->sched_scan_interval);
1140         }
1141
1142         wpa_setband_scan_freqs(wpa_s, scan_params);
1143
1144         ret = wpa_supplicant_start_sched_scan(wpa_s, scan_params,
1145                                               wpa_s->sched_scan_interval);
1146         wpabuf_free(extra_ie);
1147         os_free(params.filter_ssids);
1148         if (ret) {
1149                 wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate sched scan");
1150                 if (prev_state != wpa_s->wpa_state)
1151                         wpa_supplicant_set_state(wpa_s, prev_state);
1152                 return ret;
1153         }
1154
1155         /* If we have more SSIDs to scan, add a timeout so we scan them too */
1156         if (ssid || !wpa_s->first_sched_scan) {
1157                 wpa_s->sched_scan_timed_out = 0;
1158                 eloop_register_timeout(wpa_s->sched_scan_timeout, 0,
1159                                        wpa_supplicant_sched_scan_timeout,
1160                                        wpa_s, NULL);
1161                 wpa_s->first_sched_scan = 0;
1162                 wpa_s->sched_scan_timeout /= 2;
1163                 wpa_s->sched_scan_interval *= 2;
1164                 if (wpa_s->sched_scan_timeout < wpa_s->sched_scan_interval) {
1165                         wpa_s->sched_scan_interval = 10;
1166                         wpa_s->sched_scan_timeout = max_sched_scan_ssids * 2;
1167                 }
1168         }
1169
1170         /* If there is no more ssids, start next time from the beginning */
1171         if (!ssid)
1172                 wpa_s->prev_sched_ssid = NULL;
1173
1174         return 0;
1175 }
1176
1177
1178 /**
1179  * wpa_supplicant_cancel_scan - Cancel a scheduled scan request
1180  * @wpa_s: Pointer to wpa_supplicant data
1181  *
1182  * This function is used to cancel a scan request scheduled with
1183  * wpa_supplicant_req_scan().
1184  */
1185 void wpa_supplicant_cancel_scan(struct wpa_supplicant *wpa_s)
1186 {
1187         wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling scan request");
1188         eloop_cancel_timeout(wpa_supplicant_scan, wpa_s, NULL);
1189 }
1190
1191
1192 /**
1193  * wpa_supplicant_cancel_delayed_sched_scan - Stop a delayed scheduled scan
1194  * @wpa_s: Pointer to wpa_supplicant data
1195  *
1196  * This function is used to stop a delayed scheduled scan.
1197  */
1198 void wpa_supplicant_cancel_delayed_sched_scan(struct wpa_supplicant *wpa_s)
1199 {
1200         if (!wpa_s->sched_scan_supported)
1201                 return;
1202
1203         wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling delayed sched scan");
1204         eloop_cancel_timeout(wpa_supplicant_delayed_sched_scan_timeout,
1205                              wpa_s, NULL);
1206 }
1207
1208
1209 /**
1210  * wpa_supplicant_cancel_sched_scan - Stop running scheduled scans
1211  * @wpa_s: Pointer to wpa_supplicant data
1212  *
1213  * This function is used to stop a periodic scheduled scan.
1214  */
1215 void wpa_supplicant_cancel_sched_scan(struct wpa_supplicant *wpa_s)
1216 {
1217         if (!wpa_s->sched_scanning)
1218                 return;
1219
1220         wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling sched scan");
1221         eloop_cancel_timeout(wpa_supplicant_sched_scan_timeout, wpa_s, NULL);
1222         wpa_supplicant_stop_sched_scan(wpa_s);
1223 }
1224
1225
1226 /**
1227  * wpa_supplicant_notify_scanning - Indicate possible scan state change
1228  * @wpa_s: Pointer to wpa_supplicant data
1229  * @scanning: Whether scanning is currently in progress
1230  *
1231  * This function is to generate scanning notifycations. It is called whenever
1232  * there may have been a change in scanning (scan started, completed, stopped).
1233  * wpas_notify_scanning() is called whenever the scanning state changed from the
1234  * previously notified state.
1235  */
1236 void wpa_supplicant_notify_scanning(struct wpa_supplicant *wpa_s,
1237                                     int scanning)
1238 {
1239         if (wpa_s->scanning != scanning) {
1240                 wpa_s->scanning = scanning;
1241                 wpas_notify_scanning(wpa_s);
1242         }
1243 }
1244
1245
1246 static int wpa_scan_get_max_rate(const struct wpa_scan_res *res)
1247 {
1248         int rate = 0;
1249         const u8 *ie;
1250         int i;
1251
1252         ie = wpa_scan_get_ie(res, WLAN_EID_SUPP_RATES);
1253         for (i = 0; ie && i < ie[1]; i++) {
1254                 if ((ie[i + 2] & 0x7f) > rate)
1255                         rate = ie[i + 2] & 0x7f;
1256         }
1257
1258         ie = wpa_scan_get_ie(res, WLAN_EID_EXT_SUPP_RATES);
1259         for (i = 0; ie && i < ie[1]; i++) {
1260                 if ((ie[i + 2] & 0x7f) > rate)
1261                         rate = ie[i + 2] & 0x7f;
1262         }
1263
1264         return rate;
1265 }
1266
1267
1268 /**
1269  * wpa_scan_get_ie - Fetch a specified information element from a scan result
1270  * @res: Scan result entry
1271  * @ie: Information element identitifier (WLAN_EID_*)
1272  * Returns: Pointer to the information element (id field) or %NULL if not found
1273  *
1274  * This function returns the first matching information element in the scan
1275  * result.
1276  */
1277 const u8 * wpa_scan_get_ie(const struct wpa_scan_res *res, u8 ie)
1278 {
1279         const u8 *end, *pos;
1280
1281         pos = (const u8 *) (res + 1);
1282         end = pos + res->ie_len;
1283
1284         while (pos + 1 < end) {
1285                 if (pos + 2 + pos[1] > end)
1286                         break;
1287                 if (pos[0] == ie)
1288                         return pos;
1289                 pos += 2 + pos[1];
1290         }
1291
1292         return NULL;
1293 }
1294
1295
1296 /**
1297  * wpa_scan_get_vendor_ie - Fetch vendor information element from a scan result
1298  * @res: Scan result entry
1299  * @vendor_type: Vendor type (four octets starting the IE payload)
1300  * Returns: Pointer to the information element (id field) or %NULL if not found
1301  *
1302  * This function returns the first matching information element in the scan
1303  * result.
1304  */
1305 const u8 * wpa_scan_get_vendor_ie(const struct wpa_scan_res *res,
1306                                   u32 vendor_type)
1307 {
1308         const u8 *end, *pos;
1309
1310         pos = (const u8 *) (res + 1);
1311         end = pos + res->ie_len;
1312
1313         while (pos + 1 < end) {
1314                 if (pos + 2 + pos[1] > end)
1315                         break;
1316                 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1317                     vendor_type == WPA_GET_BE32(&pos[2]))
1318                         return pos;
1319                 pos += 2 + pos[1];
1320         }
1321
1322         return NULL;
1323 }
1324
1325
1326 /**
1327  * wpa_scan_get_vendor_ie_beacon - Fetch vendor information from a scan result
1328  * @res: Scan result entry
1329  * @vendor_type: Vendor type (four octets starting the IE payload)
1330  * Returns: Pointer to the information element (id field) or %NULL if not found
1331  *
1332  * This function returns the first matching information element in the scan
1333  * result.
1334  *
1335  * This function is like wpa_scan_get_vendor_ie(), but uses IE buffer only
1336  * from Beacon frames instead of either Beacon or Probe Response frames.
1337  */
1338 const u8 * wpa_scan_get_vendor_ie_beacon(const struct wpa_scan_res *res,
1339                                          u32 vendor_type)
1340 {
1341         const u8 *end, *pos;
1342
1343         if (res->beacon_ie_len == 0)
1344                 return NULL;
1345
1346         pos = (const u8 *) (res + 1);
1347         pos += res->ie_len;
1348         end = pos + res->beacon_ie_len;
1349
1350         while (pos + 1 < end) {
1351                 if (pos + 2 + pos[1] > end)
1352                         break;
1353                 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1354                     vendor_type == WPA_GET_BE32(&pos[2]))
1355                         return pos;
1356                 pos += 2 + pos[1];
1357         }
1358
1359         return NULL;
1360 }
1361
1362
1363 /**
1364  * wpa_scan_get_vendor_ie_multi - Fetch vendor IE data from a scan result
1365  * @res: Scan result entry
1366  * @vendor_type: Vendor type (four octets starting the IE payload)
1367  * Returns: Pointer to the information element payload or %NULL if not found
1368  *
1369  * This function returns concatenated payload of possibly fragmented vendor
1370  * specific information elements in the scan result. The caller is responsible
1371  * for freeing the returned buffer.
1372  */
1373 struct wpabuf * wpa_scan_get_vendor_ie_multi(const struct wpa_scan_res *res,
1374                                              u32 vendor_type)
1375 {
1376         struct wpabuf *buf;
1377         const u8 *end, *pos;
1378
1379         buf = wpabuf_alloc(res->ie_len);
1380         if (buf == NULL)
1381                 return NULL;
1382
1383         pos = (const u8 *) (res + 1);
1384         end = pos + res->ie_len;
1385
1386         while (pos + 1 < end) {
1387                 if (pos + 2 + pos[1] > end)
1388                         break;
1389                 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1390                     vendor_type == WPA_GET_BE32(&pos[2]))
1391                         wpabuf_put_data(buf, pos + 2 + 4, pos[1] - 4);
1392                 pos += 2 + pos[1];
1393         }
1394
1395         if (wpabuf_len(buf) == 0) {
1396                 wpabuf_free(buf);
1397                 buf = NULL;
1398         }
1399
1400         return buf;
1401 }
1402
1403
1404 /*
1405  * Channels with a great SNR can operate at full rate. What is a great SNR?
1406  * This doc https://supportforums.cisco.com/docs/DOC-12954 says, "the general
1407  * rule of thumb is that any SNR above 20 is good." This one
1408  * http://www.cisco.com/en/US/tech/tk722/tk809/technologies_q_and_a_item09186a00805e9a96.shtml#qa23
1409  * recommends 25 as a minimum SNR for 54 Mbps data rate. 30 is chosen here as a
1410  * conservative value.
1411  */
1412 #define GREAT_SNR 30
1413
1414 /* Compare function for sorting scan results. Return >0 if @b is considered
1415  * better. */
1416 static int wpa_scan_result_compar(const void *a, const void *b)
1417 {
1418 #define IS_5GHZ(n) (n > 4000)
1419 #define MIN(a,b) a < b ? a : b
1420         struct wpa_scan_res **_wa = (void *) a;
1421         struct wpa_scan_res **_wb = (void *) b;
1422         struct wpa_scan_res *wa = *_wa;
1423         struct wpa_scan_res *wb = *_wb;
1424         int wpa_a, wpa_b, maxrate_a, maxrate_b;
1425         int snr_a, snr_b;
1426
1427         /* WPA/WPA2 support preferred */
1428         wpa_a = wpa_scan_get_vendor_ie(wa, WPA_IE_VENDOR_TYPE) != NULL ||
1429                 wpa_scan_get_ie(wa, WLAN_EID_RSN) != NULL;
1430         wpa_b = wpa_scan_get_vendor_ie(wb, WPA_IE_VENDOR_TYPE) != NULL ||
1431                 wpa_scan_get_ie(wb, WLAN_EID_RSN) != NULL;
1432
1433         if (wpa_b && !wpa_a)
1434                 return 1;
1435         if (!wpa_b && wpa_a)
1436                 return -1;
1437
1438         /* privacy support preferred */
1439         if ((wa->caps & IEEE80211_CAP_PRIVACY) == 0 &&
1440             (wb->caps & IEEE80211_CAP_PRIVACY))
1441                 return 1;
1442         if ((wa->caps & IEEE80211_CAP_PRIVACY) &&
1443             (wb->caps & IEEE80211_CAP_PRIVACY) == 0)
1444                 return -1;
1445
1446         if ((wa->flags & wb->flags & WPA_SCAN_LEVEL_DBM) &&
1447             !((wa->flags | wb->flags) & WPA_SCAN_NOISE_INVALID)) {
1448                 snr_a = MIN(wa->level - wa->noise, GREAT_SNR);
1449                 snr_b = MIN(wb->level - wb->noise, GREAT_SNR);
1450         } else {
1451                 /* Not suitable information to calculate SNR, so use level */
1452                 snr_a = wa->level;
1453                 snr_b = wb->level;
1454         }
1455
1456         /* best/max rate preferred if SNR close enough */
1457         if ((snr_a && snr_b && abs(snr_b - snr_a) < 5) ||
1458             (wa->qual && wb->qual && abs(wb->qual - wa->qual) < 10)) {
1459                 maxrate_a = wpa_scan_get_max_rate(wa);
1460                 maxrate_b = wpa_scan_get_max_rate(wb);
1461                 if (maxrate_a != maxrate_b)
1462                         return maxrate_b - maxrate_a;
1463                 if (IS_5GHZ(wa->freq) ^ IS_5GHZ(wb->freq))
1464                         return IS_5GHZ(wa->freq) ? -1 : 1;
1465         }
1466
1467         /* use freq for channel preference */
1468
1469         /* all things being equal, use SNR; if SNRs are
1470          * identical, use quality values since some drivers may only report
1471          * that value and leave the signal level zero */
1472         if (snr_b == snr_a)
1473                 return wb->qual - wa->qual;
1474         return snr_b - snr_a;
1475 #undef MIN
1476 #undef IS_5GHZ
1477 }
1478
1479
1480 #ifdef CONFIG_WPS
1481 /* Compare function for sorting scan results when searching a WPS AP for
1482  * provisioning. Return >0 if @b is considered better. */
1483 static int wpa_scan_result_wps_compar(const void *a, const void *b)
1484 {
1485         struct wpa_scan_res **_wa = (void *) a;
1486         struct wpa_scan_res **_wb = (void *) b;
1487         struct wpa_scan_res *wa = *_wa;
1488         struct wpa_scan_res *wb = *_wb;
1489         int uses_wps_a, uses_wps_b;
1490         struct wpabuf *wps_a, *wps_b;
1491         int res;
1492
1493         /* Optimization - check WPS IE existence before allocated memory and
1494          * doing full reassembly. */
1495         uses_wps_a = wpa_scan_get_vendor_ie(wa, WPS_IE_VENDOR_TYPE) != NULL;
1496         uses_wps_b = wpa_scan_get_vendor_ie(wb, WPS_IE_VENDOR_TYPE) != NULL;
1497         if (uses_wps_a && !uses_wps_b)
1498                 return -1;
1499         if (!uses_wps_a && uses_wps_b)
1500                 return 1;
1501
1502         if (uses_wps_a && uses_wps_b) {
1503                 wps_a = wpa_scan_get_vendor_ie_multi(wa, WPS_IE_VENDOR_TYPE);
1504                 wps_b = wpa_scan_get_vendor_ie_multi(wb, WPS_IE_VENDOR_TYPE);
1505                 res = wps_ap_priority_compar(wps_a, wps_b);
1506                 wpabuf_free(wps_a);
1507                 wpabuf_free(wps_b);
1508                 if (res)
1509                         return res;
1510         }
1511
1512         /*
1513          * Do not use current AP security policy as a sorting criteria during
1514          * WPS provisioning step since the AP may get reconfigured at the
1515          * completion of provisioning.
1516          */
1517
1518         /* all things being equal, use signal level; if signal levels are
1519          * identical, use quality values since some drivers may only report
1520          * that value and leave the signal level zero */
1521         if (wb->level == wa->level)
1522                 return wb->qual - wa->qual;
1523         return wb->level - wa->level;
1524 }
1525 #endif /* CONFIG_WPS */
1526
1527
1528 static void dump_scan_res(struct wpa_scan_results *scan_res)
1529 {
1530 #ifndef CONFIG_NO_STDOUT_DEBUG
1531         size_t i;
1532
1533         if (scan_res->res == NULL || scan_res->num == 0)
1534                 return;
1535
1536         wpa_printf(MSG_EXCESSIVE, "Sorted scan results");
1537
1538         for (i = 0; i < scan_res->num; i++) {
1539                 struct wpa_scan_res *r = scan_res->res[i];
1540                 u8 *pos;
1541                 if ((r->flags & (WPA_SCAN_LEVEL_DBM | WPA_SCAN_NOISE_INVALID))
1542                     == WPA_SCAN_LEVEL_DBM) {
1543                         int snr = r->level - r->noise;
1544                         wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d "
1545                                    "noise=%d level=%d snr=%d%s flags=0x%x "
1546                                    "age=%u",
1547                                    MAC2STR(r->bssid), r->freq, r->qual,
1548                                    r->noise, r->level, snr,
1549                                    snr >= GREAT_SNR ? "*" : "", r->flags,
1550                                    r->age);
1551                 } else {
1552                         wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d "
1553                                    "noise=%d level=%d flags=0x%x age=%u",
1554                                    MAC2STR(r->bssid), r->freq, r->qual,
1555                                    r->noise, r->level, r->flags, r->age);
1556                 }
1557                 pos = (u8 *) (r + 1);
1558                 if (r->ie_len)
1559                         wpa_hexdump(MSG_EXCESSIVE, "IEs", pos, r->ie_len);
1560                 pos += r->ie_len;
1561                 if (r->beacon_ie_len)
1562                         wpa_hexdump(MSG_EXCESSIVE, "Beacon IEs",
1563                                     pos, r->beacon_ie_len);
1564         }
1565 #endif /* CONFIG_NO_STDOUT_DEBUG */
1566 }
1567
1568
1569 /**
1570  * wpa_supplicant_filter_bssid_match - Is the specified BSSID allowed
1571  * @wpa_s: Pointer to wpa_supplicant data
1572  * @bssid: BSSID to check
1573  * Returns: 0 if the BSSID is filtered or 1 if not
1574  *
1575  * This function is used to filter out specific BSSIDs from scan reslts mainly
1576  * for testing purposes (SET bssid_filter ctrl_iface command).
1577  */
1578 int wpa_supplicant_filter_bssid_match(struct wpa_supplicant *wpa_s,
1579                                       const u8 *bssid)
1580 {
1581         size_t i;
1582
1583         if (wpa_s->bssid_filter == NULL)
1584                 return 1;
1585
1586         for (i = 0; i < wpa_s->bssid_filter_count; i++) {
1587                 if (os_memcmp(wpa_s->bssid_filter + i * ETH_ALEN, bssid,
1588                               ETH_ALEN) == 0)
1589                         return 1;
1590         }
1591
1592         return 0;
1593 }
1594
1595
1596 static void filter_scan_res(struct wpa_supplicant *wpa_s,
1597                             struct wpa_scan_results *res)
1598 {
1599         size_t i, j;
1600
1601         if (wpa_s->bssid_filter == NULL)
1602                 return;
1603
1604         for (i = 0, j = 0; i < res->num; i++) {
1605                 if (wpa_supplicant_filter_bssid_match(wpa_s,
1606                                                       res->res[i]->bssid)) {
1607                         res->res[j++] = res->res[i];
1608                 } else {
1609                         os_free(res->res[i]);
1610                         res->res[i] = NULL;
1611                 }
1612         }
1613
1614         if (res->num != j) {
1615                 wpa_printf(MSG_DEBUG, "Filtered out %d scan results",
1616                            (int) (res->num - j));
1617                 res->num = j;
1618         }
1619 }
1620
1621
1622 /**
1623  * wpa_supplicant_get_scan_results - Get scan results
1624  * @wpa_s: Pointer to wpa_supplicant data
1625  * @info: Information about what was scanned or %NULL if not available
1626  * @new_scan: Whether a new scan was performed
1627  * Returns: Scan results, %NULL on failure
1628  *
1629  * This function request the current scan results from the driver and updates
1630  * the local BSS list wpa_s->bss. The caller is responsible for freeing the
1631  * results with wpa_scan_results_free().
1632  */
1633 struct wpa_scan_results *
1634 wpa_supplicant_get_scan_results(struct wpa_supplicant *wpa_s,
1635                                 struct scan_info *info, int new_scan)
1636 {
1637         struct wpa_scan_results *scan_res;
1638         size_t i;
1639         int (*compar)(const void *, const void *) = wpa_scan_result_compar;
1640
1641         scan_res = wpa_drv_get_scan_results2(wpa_s);
1642         if (scan_res == NULL) {
1643                 wpa_dbg(wpa_s, MSG_DEBUG, "Failed to get scan results");
1644                 return NULL;
1645         }
1646         if (scan_res->fetch_time.sec == 0) {
1647                 /*
1648                  * Make sure we have a valid timestamp if the driver wrapper
1649                  * does not set this.
1650                  */
1651                 os_get_reltime(&scan_res->fetch_time);
1652         }
1653         filter_scan_res(wpa_s, scan_res);
1654
1655 #ifdef CONFIG_WPS
1656         if (wpas_wps_searching(wpa_s)) {
1657                 wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Order scan results with WPS "
1658                         "provisioning rules");
1659                 compar = wpa_scan_result_wps_compar;
1660         }
1661 #endif /* CONFIG_WPS */
1662
1663         qsort(scan_res->res, scan_res->num, sizeof(struct wpa_scan_res *),
1664               compar);
1665         dump_scan_res(scan_res);
1666
1667         wpa_bss_update_start(wpa_s);
1668         for (i = 0; i < scan_res->num; i++)
1669                 wpa_bss_update_scan_res(wpa_s, scan_res->res[i],
1670                                         &scan_res->fetch_time);
1671         wpa_bss_update_end(wpa_s, info, new_scan);
1672
1673         return scan_res;
1674 }
1675
1676
1677 /**
1678  * wpa_supplicant_update_scan_results - Update scan results from the driver
1679  * @wpa_s: Pointer to wpa_supplicant data
1680  * Returns: 0 on success, -1 on failure
1681  *
1682  * This function updates the BSS table within wpa_supplicant based on the
1683  * currently available scan results from the driver without requesting a new
1684  * scan. This is used in cases where the driver indicates an association
1685  * (including roaming within ESS) and wpa_supplicant does not yet have the
1686  * needed information to complete the connection (e.g., to perform validation
1687  * steps in 4-way handshake).
1688  */
1689 int wpa_supplicant_update_scan_results(struct wpa_supplicant *wpa_s)
1690 {
1691         struct wpa_scan_results *scan_res;
1692         scan_res = wpa_supplicant_get_scan_results(wpa_s, NULL, 0);
1693         if (scan_res == NULL)
1694                 return -1;
1695         wpa_scan_results_free(scan_res);
1696
1697         return 0;
1698 }
1699
1700
1701 /**
1702  * scan_only_handler - Reports scan results
1703  */
1704 void scan_only_handler(struct wpa_supplicant *wpa_s,
1705                        struct wpa_scan_results *scan_res)
1706 {
1707         wpa_dbg(wpa_s, MSG_DEBUG, "Scan-only results received");
1708         if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
1709             wpa_s->manual_scan_use_id && wpa_s->own_scan_running) {
1710                 wpa_msg_ctrl(wpa_s, MSG_INFO, WPA_EVENT_SCAN_RESULTS "id=%u",
1711                              wpa_s->manual_scan_id);
1712                 wpa_s->manual_scan_use_id = 0;
1713         } else {
1714                 wpa_msg_ctrl(wpa_s, MSG_INFO, WPA_EVENT_SCAN_RESULTS);
1715         }
1716         wpas_notify_scan_results(wpa_s);
1717         wpas_notify_scan_done(wpa_s, 1);
1718         if (wpa_s->scan_work) {
1719                 struct wpa_radio_work *work = wpa_s->scan_work;
1720                 wpa_s->scan_work = NULL;
1721                 radio_work_done(work);
1722         }
1723 }
1724
1725
1726 int wpas_scan_scheduled(struct wpa_supplicant *wpa_s)
1727 {
1728         return eloop_is_timeout_registered(wpa_supplicant_scan, wpa_s, NULL);
1729 }
1730
1731
1732 struct wpa_driver_scan_params *
1733 wpa_scan_clone_params(const struct wpa_driver_scan_params *src)
1734 {
1735         struct wpa_driver_scan_params *params;
1736         size_t i;
1737         u8 *n;
1738
1739         params = os_zalloc(sizeof(*params));
1740         if (params == NULL)
1741                 return NULL;
1742
1743         for (i = 0; i < src->num_ssids; i++) {
1744                 if (src->ssids[i].ssid) {
1745                         n = os_malloc(src->ssids[i].ssid_len);
1746                         if (n == NULL)
1747                                 goto failed;
1748                         os_memcpy(n, src->ssids[i].ssid,
1749                                   src->ssids[i].ssid_len);
1750                         params->ssids[i].ssid = n;
1751                         params->ssids[i].ssid_len = src->ssids[i].ssid_len;
1752                 }
1753         }
1754         params->num_ssids = src->num_ssids;
1755
1756         if (src->extra_ies) {
1757                 n = os_malloc(src->extra_ies_len);
1758                 if (n == NULL)
1759                         goto failed;
1760                 os_memcpy(n, src->extra_ies, src->extra_ies_len);
1761                 params->extra_ies = n;
1762                 params->extra_ies_len = src->extra_ies_len;
1763         }
1764
1765         if (src->freqs) {
1766                 int len = int_array_len(src->freqs);
1767                 params->freqs = os_malloc((len + 1) * sizeof(int));
1768                 if (params->freqs == NULL)
1769                         goto failed;
1770                 os_memcpy(params->freqs, src->freqs, (len + 1) * sizeof(int));
1771         }
1772
1773         if (src->filter_ssids) {
1774                 params->filter_ssids = os_malloc(sizeof(*params->filter_ssids) *
1775                                                  src->num_filter_ssids);
1776                 if (params->filter_ssids == NULL)
1777                         goto failed;
1778                 os_memcpy(params->filter_ssids, src->filter_ssids,
1779                           sizeof(*params->filter_ssids) *
1780                           src->num_filter_ssids);
1781                 params->num_filter_ssids = src->num_filter_ssids;
1782         }
1783
1784         params->filter_rssi = src->filter_rssi;
1785         params->p2p_probe = src->p2p_probe;
1786         params->only_new_results = src->only_new_results;
1787
1788         return params;
1789
1790 failed:
1791         wpa_scan_free_params(params);
1792         return NULL;
1793 }
1794
1795
1796 void wpa_scan_free_params(struct wpa_driver_scan_params *params)
1797 {
1798         size_t i;
1799
1800         if (params == NULL)
1801                 return;
1802
1803         for (i = 0; i < params->num_ssids; i++)
1804                 os_free((u8 *) params->ssids[i].ssid);
1805         os_free((u8 *) params->extra_ies);
1806         os_free(params->freqs);
1807         os_free(params->filter_ssids);
1808         os_free(params);
1809 }