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, 6);
 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         wpabuf_put_u8(buf, 0x00);
 374 #ifdef CONFIG_HS20
 375         wpabuf_put_u8(buf, 0x40); /* Bit 46 - WNM-Notification */
 376 #else /* CONFIG_HS20 */
 377         wpabuf_put_u8(buf, 0x00);
 378 #endif /* CONFIG_HS20 */
 379
 380         wpabuf_put_u8(buf, WLAN_EID_INTERWORKING);
 381         wpabuf_put_u8(buf, is_zero_ether_addr(wpa_s->conf->hessid) ? 1 :
 382                       1 + ETH_ALEN);
 383         wpabuf_put_u8(buf, wpa_s->conf->access_network_type);
 384         /* No Venue Info */
 385         if (!is_zero_ether_addr(wpa_s->conf->hessid))
 386                 wpabuf_put_data(buf, wpa_s->conf->hessid, ETH_ALEN);
 387 }
 388 #endif /* CONFIG_INTERWORKING */
 389
 390
 391 static struct wpabuf * wpa_supplicant_extra_ies(struct wpa_supplicant *wpa_s)
 392 {
 393         struct wpabuf *extra_ie = NULL;
 394 #ifdef CONFIG_WPS
 395         int wps = 0;
 396         enum wps_request_type req_type = WPS_REQ_ENROLLEE_INFO;
 397 #endif /* CONFIG_WPS */
 398
 399 #ifdef CONFIG_INTERWORKING
 400         if (wpa_s->conf->interworking &&
 401             wpabuf_resize(&extra_ie, 100) == 0)
 402                 wpas_add_interworking_elements(wpa_s, extra_ie);
 403 #endif /* CONFIG_INTERWORKING */
 404
 405 #ifdef CONFIG_WPS
 406         wps = wpas_wps_in_use(wpa_s, &req_type);
 407
 408         if (wps) {
 409                 struct wpabuf *wps_ie;
 410                 wps_ie = wps_build_probe_req_ie(wps == 2 ? DEV_PW_PUSHBUTTON :
 411                                                 DEV_PW_DEFAULT,
 412                                                 &wpa_s->wps->dev,
 413                                                 wpa_s->wps->uuid, req_type,
 414                                                 0, NULL);
 415                 if (wps_ie) {
 416                         if (wpabuf_resize(&extra_ie, wpabuf_len(wps_ie)) == 0)
 417                                 wpabuf_put_buf(extra_ie, wps_ie);
 418                         wpabuf_free(wps_ie);
 419                 }
 420         }
 421
 422 #ifdef CONFIG_P2P
 423         if (wps) {
 424                 size_t ielen = p2p_scan_ie_buf_len(wpa_s->global->p2p);
 425                 if (wpabuf_resize(&extra_ie, ielen) == 0)
 426                         wpas_p2p_scan_ie(wpa_s, extra_ie);
 427         }
 428 #endif /* CONFIG_P2P */
 429
 430 #endif /* CONFIG_WPS */
 431
 432 #ifdef CONFIG_HS20
 433         if (wpa_s->conf->hs20 && wpabuf_resize(&extra_ie, 7) == 0)
 434                 wpas_hs20_add_indication(extra_ie, -1);
 435 #endif /* CONFIG_HS20 */
 436
 437         return extra_ie;
 438 }
 439
 440
 441 #ifdef CONFIG_P2P
 442
 443 /*
 444  * Check whether there are any enabled networks or credentials that could be
 445  * used for a non-P2P connection.
 446  */
 447 static int non_p2p_network_enabled(struct wpa_supplicant *wpa_s)
 448 {
 449         struct wpa_ssid *ssid;
 450
 451         for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
 452                 if (wpas_network_disabled(wpa_s, ssid))
 453                         continue;
 454                 if (!ssid->p2p_group)
 455                         return 1;
 456         }
 457
 458         if (wpa_s->conf->cred && wpa_s->conf->interworking &&
 459             wpa_s->conf->auto_interworking)
 460                 return 1;
 461
 462         return 0;
 463 }
 464
 465 #endif /* CONFIG_P2P */
 466
 467
 468 static struct hostapd_hw_modes * get_mode(struct hostapd_hw_modes *modes,
 469                                           u16 num_modes,
 470                                           enum hostapd_hw_mode mode)
 471 {
 472         u16 i;
 473
 474         for (i = 0; i < num_modes; i++) {
 475                 if (modes[i].mode == mode)
 476                         return &modes[i];
 477         }
 478
 479         return NULL;
 480 }
 481
 482
 483 static void wpa_setband_scan_freqs_list(struct wpa_supplicant *wpa_s,
 484                                         enum hostapd_hw_mode band,
 485                                         struct wpa_driver_scan_params *params)
 486 {
 487         /* Include only supported channels for the specified band */
 488         struct hostapd_hw_modes *mode;
 489         int count, i;
 490
 491         mode = get_mode(wpa_s->hw.modes, wpa_s->hw.num_modes, band);
 492         if (mode == NULL) {
 493                 /* No channels supported in this band - use empty list */
 494                 params->freqs = os_zalloc(sizeof(int));
 495                 return;
 496         }
 497
 498         params->freqs = os_zalloc((mode->num_channels + 1) * sizeof(int));
 499         if (params->freqs == NULL)
 500                 return;
 501         for (count = 0, i = 0; i < mode->num_channels; i++) {
 502                 if (mode->channels[i].flag & HOSTAPD_CHAN_DISABLED)
 503                         continue;
 504                 params->freqs[count++] = mode->channels[i].freq;
 505         }
 506 }
 507
 508
 509 static void wpa_setband_scan_freqs(struct wpa_supplicant *wpa_s,
 510                                    struct wpa_driver_scan_params *params)
 511 {
 512         if (wpa_s->hw.modes == NULL)
 513                 return; /* unknown what channels the driver supports */
 514         if (params->freqs)
 515                 return; /* already using a limited channel set */
 516         if (wpa_s->setband == WPA_SETBAND_5G)
 517                 wpa_setband_scan_freqs_list(wpa_s, HOSTAPD_MODE_IEEE80211A,
 518                                             params);
 519         else if (wpa_s->setband == WPA_SETBAND_2G)
 520                 wpa_setband_scan_freqs_list(wpa_s, HOSTAPD_MODE_IEEE80211G,
 521                                             params);
 522 }
 523
 524
 525 static void wpa_supplicant_scan(void *eloop_ctx, void *timeout_ctx)
 526 {
 527         struct wpa_supplicant *wpa_s = eloop_ctx;
 528         struct wpa_ssid *ssid;
 529         int ret;
 530         struct wpabuf *extra_ie = NULL;
 531         struct wpa_driver_scan_params params;
 532         struct wpa_driver_scan_params *scan_params;
 533         size_t max_ssids;
 534         enum wpa_states prev_state;
 535
 536         if (wpa_s->pno || wpa_s->pno_sched_pending) {
 537                 wpa_dbg(wpa_s, MSG_DEBUG, "Skip scan - PNO is in progress");
 538                 return;
 539         }
 540
 541         if (wpa_s->wpa_state == WPA_INTERFACE_DISABLED) {
 542                 wpa_dbg(wpa_s, MSG_DEBUG, "Skip scan - interface disabled");
 543                 return;
 544         }
 545
 546         if (wpa_s->disconnected && wpa_s->scan_req == NORMAL_SCAN_REQ) {
 547                 wpa_dbg(wpa_s, MSG_DEBUG, "Disconnected - do not scan");
 548                 wpa_supplicant_set_state(wpa_s, WPA_DISCONNECTED);
 549                 return;
 550         }
 551
 552         if (wpa_s->scanning) {
 553                 /*
 554                  * If we are already in scanning state, we shall reschedule the
 555                  * the incoming scan request.
 556                  */
 557                 wpa_dbg(wpa_s, MSG_DEBUG, "Already scanning - Reschedule the incoming scan req");
 558                 wpa_supplicant_req_scan(wpa_s, 1, 0);
 559                 return;
 560         }
 561
 562         if (!wpa_supplicant_enabled_networks(wpa_s) &&
 563             wpa_s->scan_req == NORMAL_SCAN_REQ) {
 564                 wpa_dbg(wpa_s, MSG_DEBUG, "No enabled networks - do not scan");
 565                 wpa_supplicant_set_state(wpa_s, WPA_INACTIVE);
 566                 return;
 567         }
 568
 569         if (wpa_s->conf->ap_scan != 0 &&
 570             (wpa_s->drv_flags & WPA_DRIVER_FLAGS_WIRED)) {
 571                 wpa_dbg(wpa_s, MSG_DEBUG, "Using wired authentication - "
 572                         "overriding ap_scan configuration");
 573                 wpa_s->conf->ap_scan = 0;
 574                 wpas_notify_ap_scan_changed(wpa_s);
 575         }
 576
 577         if (wpa_s->conf->ap_scan == 0) {
 578                 wpa_supplicant_gen_assoc_event(wpa_s);
 579                 return;
 580         }
 581
 582 #ifdef CONFIG_P2P
 583         if (wpas_p2p_in_progress(wpa_s)) {
 584                 wpa_dbg(wpa_s, MSG_DEBUG, "Delay station mode scan while P2P operation is in progress");
 585                 wpa_supplicant_req_scan(wpa_s, 5, 0);
 586                 return;
 587         }
 588 #endif /* CONFIG_P2P */
 589
 590         if (wpa_s->conf->ap_scan == 2)
 591                 max_ssids = 1;
 592         else {
 593                 max_ssids = wpa_s->max_scan_ssids;
 594                 if (max_ssids > WPAS_MAX_SCAN_SSIDS)
 595                         max_ssids = WPAS_MAX_SCAN_SSIDS;
 596         }
 597
 598         wpa_s->last_scan_req = wpa_s->scan_req;
 599         wpa_s->scan_req = NORMAL_SCAN_REQ;
 600
 601         os_memset(&params, 0, sizeof(params));
 602
 603         prev_state = wpa_s->wpa_state;
 604         if (wpa_s->wpa_state == WPA_DISCONNECTED ||
 605             wpa_s->wpa_state == WPA_INACTIVE)
 606                 wpa_supplicant_set_state(wpa_s, WPA_SCANNING);
 607
 608         /*
 609          * If autoscan has set its own scanning parameters
 610          */
 611         if (wpa_s->autoscan_params != NULL) {
 612                 scan_params = wpa_s->autoscan_params;
 613                 goto scan;
 614         }
 615
 616         if (wpa_s->last_scan_req != MANUAL_SCAN_REQ &&
 617             wpa_s->connect_without_scan) {
 618                 for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
 619                         if (ssid == wpa_s->connect_without_scan)
 620                                 break;
 621                 }
 622                 wpa_s->connect_without_scan = NULL;
 623                 if (ssid) {
 624                         wpa_printf(MSG_DEBUG, "Start a pre-selected network "
 625                                    "without scan step");
 626                         wpa_supplicant_associate(wpa_s, NULL, ssid);
 627                         return;
 628                 }
 629         }
 630
 631 #ifdef CONFIG_P2P
 632         if ((wpa_s->p2p_in_provisioning || wpa_s->show_group_started) &&
 633             wpa_s->go_params) {
 634                 wpa_printf(MSG_DEBUG, "P2P: Use specific SSID for scan during P2P group formation (p2p_in_provisioning=%d show_group_started=%d)",
 635                            wpa_s->p2p_in_provisioning,
 636                            wpa_s->show_group_started);
 637                 params.ssids[0].ssid = wpa_s->go_params->ssid;
 638                 params.ssids[0].ssid_len = wpa_s->go_params->ssid_len;
 639                 params.num_ssids = 1;
 640                 goto ssid_list_set;
 641         }
 642 #endif /* CONFIG_P2P */
 643
 644         /* Find the starting point from which to continue scanning */
 645         ssid = wpa_s->conf->ssid;
 646         if (wpa_s->prev_scan_ssid != WILDCARD_SSID_SCAN) {
 647                 while (ssid) {
 648                         if (ssid == wpa_s->prev_scan_ssid) {
 649                                 ssid = ssid->next;
 650                                 break;
 651                         }
 652                         ssid = ssid->next;
 653                 }
 654         }
 655
 656         if (wpa_s->last_scan_req != MANUAL_SCAN_REQ &&
 657             wpa_s->conf->ap_scan == 2) {
 658                 wpa_s->connect_without_scan = NULL;
 659                 wpa_s->prev_scan_wildcard = 0;
 660                 wpa_supplicant_assoc_try(wpa_s, ssid);
 661                 return;
 662         } else if (wpa_s->conf->ap_scan == 2) {
 663                 /*
 664                  * User-initiated scan request in ap_scan == 2; scan with
 665                  * wildcard SSID.
 666                  */
 667                 ssid = NULL;
 668         } else {
 669                 struct wpa_ssid *start = ssid, *tssid;
 670                 int freqs_set = 0;
 671                 if (ssid == NULL && max_ssids > 1)
 672                         ssid = wpa_s->conf->ssid;
 673                 while (ssid) {
 674                         if (!wpas_network_disabled(wpa_s, ssid) &&
 675                             ssid->scan_ssid) {
 676                                 wpa_hexdump_ascii(MSG_DEBUG, "Scan SSID",
 677                                                   ssid->ssid, ssid->ssid_len);
 678                                 params.ssids[params.num_ssids].ssid =
 679                                         ssid->ssid;
 680                                 params.ssids[params.num_ssids].ssid_len =
 681                                         ssid->ssid_len;
 682                                 params.num_ssids++;
 683                                 if (params.num_ssids + 1 >= max_ssids)
 684                                         break;
 685                         }
 686                         ssid = ssid->next;
 687                         if (ssid == start)
 688                                 break;
 689                         if (ssid == NULL && max_ssids > 1 &&
 690                             start != wpa_s->conf->ssid)
 691                                 ssid = wpa_s->conf->ssid;
 692                 }
 693
 694                 for (tssid = wpa_s->conf->ssid; tssid; tssid = tssid->next) {
 695                         if (wpas_network_disabled(wpa_s, tssid))
 696                                 continue;
 697                         if ((params.freqs || !freqs_set) && tssid->scan_freq) {
 698                                 int_array_concat(&params.freqs,
 699                                                  tssid->scan_freq);
 700                         } else {
 701                                 os_free(params.freqs);
 702                                 params.freqs = NULL;
 703                         }
 704                         freqs_set = 1;
 705                 }
 706                 int_array_sort_unique(params.freqs);
 707         }
 708
 709         if (ssid && max_ssids == 1) {
 710                 /*
 711                  * If the driver is limited to 1 SSID at a time interleave
 712                  * wildcard SSID scans with specific SSID scans to avoid
 713                  * waiting a long time for a wildcard scan.
 714                  */
 715                 if (!wpa_s->prev_scan_wildcard) {
 716                         params.ssids[0].ssid = NULL;
 717                         params.ssids[0].ssid_len = 0;
 718                         wpa_s->prev_scan_wildcard = 1;
 719                         wpa_dbg(wpa_s, MSG_DEBUG, "Starting AP scan for "
 720                                 "wildcard SSID (Interleave with specific)");
 721                 } else {
 722                         wpa_s->prev_scan_ssid = ssid;
 723                         wpa_s->prev_scan_wildcard = 0;
 724                         wpa_dbg(wpa_s, MSG_DEBUG,
 725                                 "Starting AP scan for specific SSID: %s",
 726                                 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
 727                 }
 728         } else if (ssid) {
 729                 /* max_ssids > 1 */
 730
 731                 wpa_s->prev_scan_ssid = ssid;
 732                 wpa_dbg(wpa_s, MSG_DEBUG, "Include wildcard SSID in "
 733                         "the scan request");
 734                 params.num_ssids++;
 735         } else if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
 736                    wpa_s->manual_scan_passive && params.num_ssids == 0) {
 737                 wpa_dbg(wpa_s, MSG_DEBUG, "Use passive scan based on manual request");
 738         } else {
 739                 wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
 740                 params.num_ssids++;
 741                 wpa_dbg(wpa_s, MSG_DEBUG, "Starting AP scan for wildcard "
 742                         "SSID");
 743         }
 744 #ifdef CONFIG_P2P
 745 ssid_list_set:
 746 #endif /* CONFIG_P2P */
 747
 748         wpa_supplicant_optimize_freqs(wpa_s, &params);
 749         extra_ie = wpa_supplicant_extra_ies(wpa_s);
 750
 751         if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
 752             wpa_s->manual_scan_only_new)
 753                 params.only_new_results = 1;
 754
 755         if (wpa_s->last_scan_req == MANUAL_SCAN_REQ && params.freqs == NULL &&
 756             wpa_s->manual_scan_freqs) {
 757                 wpa_dbg(wpa_s, MSG_DEBUG, "Limit manual scan to specified channels");
 758                 params.freqs = wpa_s->manual_scan_freqs;
 759                 wpa_s->manual_scan_freqs = NULL;
 760         }
 761
 762         if (params.freqs == NULL && wpa_s->next_scan_freqs) {
 763                 wpa_dbg(wpa_s, MSG_DEBUG, "Optimize scan based on previously "
 764                         "generated frequency list");
 765                 params.freqs = wpa_s->next_scan_freqs;
 766         } else
 767                 os_free(wpa_s->next_scan_freqs);
 768         wpa_s->next_scan_freqs = NULL;
 769         wpa_setband_scan_freqs(wpa_s, &params);
 770
 771         /* See if user specified frequencies. If so, scan only those. */
 772         if (wpa_s->conf->freq_list && !params.freqs) {
 773                 wpa_dbg(wpa_s, MSG_DEBUG,
 774                         "Optimize scan based on conf->freq_list");
 775                 int_array_concat(&params.freqs, wpa_s->conf->freq_list);
 776         }
 777
 778         /* Use current associated channel? */
 779         if (wpa_s->conf->scan_cur_freq && !params.freqs) {
 780                 unsigned int num = wpa_s->num_multichan_concurrent;
 781
 782                 params.freqs = os_calloc(num + 1, sizeof(int));
 783                 if (params.freqs) {
 784                         num = get_shared_radio_freqs(wpa_s, params.freqs, num);
 785                         if (num > 0) {
 786                                 wpa_dbg(wpa_s, MSG_DEBUG, "Scan only the "
 787                                         "current operating channels since "
 788                                         "scan_cur_freq is enabled");
 789                         } else {
 790                                 os_free(params.freqs);
 791                                 params.freqs = NULL;
 792                         }
 793                 }
 794         }
 795
 796         params.filter_ssids = wpa_supplicant_build_filter_ssids(
 797                 wpa_s->conf, &params.num_filter_ssids);
 798         if (extra_ie) {
 799                 params.extra_ies = wpabuf_head(extra_ie);
 800                 params.extra_ies_len = wpabuf_len(extra_ie);
 801         }
 802
 803 #ifdef CONFIG_P2P
 804         if (wpa_s->p2p_in_provisioning ||
 805             (wpa_s->show_group_started && wpa_s->go_params)) {
 806                 /*
 807                  * The interface may not yet be in P2P mode, so we have to
 808                  * explicitly request P2P probe to disable CCK rates.
 809                  */
 810                 params.p2p_probe = 1;
 811         }
 812 #endif /* CONFIG_P2P */
 813
 814         scan_params = &params;
 815
 816 scan:
 817 #ifdef CONFIG_P2P
 818         /*
 819          * If the driver does not support multi-channel concurrency and a
 820          * virtual interface that shares the same radio with the wpa_s interface
 821          * is operating there may not be need to scan other channels apart from
 822          * the current operating channel on the other virtual interface. Filter
 823          * out other channels in case we are trying to find a connection for a
 824          * station interface when we are not configured to prefer station
 825          * connection and a concurrent operation is already in process.
 826          */
 827         if (wpa_s->scan_for_connection &&
 828             wpa_s->last_scan_req == NORMAL_SCAN_REQ &&
 829             !scan_params->freqs && !params.freqs &&
 830             wpas_is_p2p_prioritized(wpa_s) &&
 831             wpa_s->p2p_group_interface == NOT_P2P_GROUP_INTERFACE &&
 832             non_p2p_network_enabled(wpa_s)) {
 833                 unsigned int num = wpa_s->num_multichan_concurrent;
 834
 835                 params.freqs = os_calloc(num + 1, sizeof(int));
 836                 if (params.freqs) {
 837                         num = get_shared_radio_freqs(wpa_s, params.freqs, num);
 838                         if (num > 0 && num == wpa_s->num_multichan_concurrent) {
 839                                 wpa_dbg(wpa_s, MSG_DEBUG, "Scan only the current operating channels since all channels are already used");
 840                         } else {
 841                                 os_free(params.freqs);
 842                                 params.freqs = NULL;
 843                         }
 844                 }
 845         }
 846 #endif /* CONFIG_P2P */
 847
 848         ret = wpa_supplicant_trigger_scan(wpa_s, scan_params);
 849
 850         if (ret && wpa_s->last_scan_req == MANUAL_SCAN_REQ && params.freqs &&
 851             !wpa_s->manual_scan_freqs) {
 852                 /* Restore manual_scan_freqs for the next attempt */
 853                 wpa_s->manual_scan_freqs = params.freqs;
 854                 params.freqs = NULL;
 855         }
 856
 857         wpabuf_free(extra_ie);
 858         os_free(params.freqs);
 859         os_free(params.filter_ssids);
 860
 861         if (ret) {
 862                 wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate AP scan");
 863                 if (prev_state != wpa_s->wpa_state)
 864                         wpa_supplicant_set_state(wpa_s, prev_state);
 865                 /* Restore scan_req since we will try to scan again */
 866                 wpa_s->scan_req = wpa_s->last_scan_req;
 867                 wpa_supplicant_req_scan(wpa_s, 1, 0);
 868         } else {
 869                 wpa_s->scan_for_connection = 0;
 870         }
 871 }
 872
 873
 874 void wpa_supplicant_update_scan_int(struct wpa_supplicant *wpa_s, int sec)
 875 {
 876         struct os_reltime remaining, new_int;
 877         int cancelled;
 878
 879         cancelled = eloop_cancel_timeout_one(wpa_supplicant_scan, wpa_s, NULL,
 880                                              &remaining);
 881
 882         new_int.sec = sec;
 883         new_int.usec = 0;
 884         if (cancelled && os_reltime_before(&remaining, &new_int)) {
 885                 new_int.sec = remaining.sec;
 886                 new_int.usec = remaining.usec;
 887         }
 888
 889         if (cancelled) {
 890                 eloop_register_timeout(new_int.sec, new_int.usec,
 891                                        wpa_supplicant_scan, wpa_s, NULL);
 892         }
 893         wpa_s->scan_interval = sec;
 894 }
 895
 896
 897 /**
 898  * wpa_supplicant_req_scan - Schedule a scan for neighboring access points
 899  * @wpa_s: Pointer to wpa_supplicant data
 900  * @sec: Number of seconds after which to scan
 901  * @usec: Number of microseconds after which to scan
 902  *
 903  * This function is used to schedule a scan for neighboring access points after
 904  * the specified time.
 905  */
 906 void wpa_supplicant_req_scan(struct wpa_supplicant *wpa_s, int sec, int usec)
 907 {
 908         int res = eloop_deplete_timeout(sec, usec, wpa_supplicant_scan, wpa_s,
 909                                         NULL);
 910         if (res == 1) {
 911                 wpa_dbg(wpa_s, MSG_DEBUG, "Rescheduling scan request: %d.%06d sec",
 912                         sec, usec);
 913         } else if (res == 0) {
 914                 wpa_dbg(wpa_s, MSG_DEBUG, "Ignore new scan request for %d.%06d sec since an earlier request is scheduled to trigger sooner",
 915                         sec, usec);
 916         } else {
 917                 wpa_dbg(wpa_s, MSG_DEBUG, "Setting scan request: %d.%06d sec",
 918                         sec, usec);
 919                 eloop_register_timeout(sec, usec, wpa_supplicant_scan, wpa_s, NULL);
 920         }
 921 }
 922
 923
 924 /**
 925  * wpa_supplicant_delayed_sched_scan - Request a delayed scheduled scan
 926  * @wpa_s: Pointer to wpa_supplicant data
 927  * @sec: Number of seconds after which to scan
 928  * @usec: Number of microseconds after which to scan
 929  * Returns: 0 on success or -1 otherwise
 930  *
 931  * This function is used to schedule periodic scans for neighboring
 932  * access points after the specified time.
 933  */
 934 int wpa_supplicant_delayed_sched_scan(struct wpa_supplicant *wpa_s,
 935                                       int sec, int usec)
 936 {
 937         if (!wpa_s->sched_scan_supported)
 938                 return -1;
 939
 940         eloop_register_timeout(sec, usec,
 941                                wpa_supplicant_delayed_sched_scan_timeout,
 942                                wpa_s, NULL);
 943
 944         return 0;
 945 }
 946
 947
 948 /**
 949  * wpa_supplicant_req_sched_scan - Start a periodic scheduled scan
 950  * @wpa_s: Pointer to wpa_supplicant data
 951  * Returns: 0 is sched_scan was started or -1 otherwise
 952  *
 953  * This function is used to schedule periodic scans for neighboring
 954  * access points repeating the scan continuously.
 955  */
 956 int wpa_supplicant_req_sched_scan(struct wpa_supplicant *wpa_s)
 957 {
 958         struct wpa_driver_scan_params params;
 959         struct wpa_driver_scan_params *scan_params;
 960         enum wpa_states prev_state;
 961         struct wpa_ssid *ssid = NULL;
 962         struct wpabuf *extra_ie = NULL;
 963         int ret;
 964         unsigned int max_sched_scan_ssids;
 965         int wildcard = 0;
 966         int need_ssids;
 967
 968         if (!wpa_s->sched_scan_supported)
 969                 return -1;
 970
 971         if (wpa_s->max_sched_scan_ssids > WPAS_MAX_SCAN_SSIDS)
 972                 max_sched_scan_ssids = WPAS_MAX_SCAN_SSIDS;
 973         else
 974                 max_sched_scan_ssids = wpa_s->max_sched_scan_ssids;
 975         if (max_sched_scan_ssids < 1 || wpa_s->conf->disable_scan_offload)
 976                 return -1;
 977
 978         if (wpa_s->sched_scanning) {
 979                 wpa_dbg(wpa_s, MSG_DEBUG, "Already sched scanning");
 980                 return 0;
 981         }
 982
 983         need_ssids = 0;
 984         for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
 985                 if (!wpas_network_disabled(wpa_s, ssid) && !ssid->scan_ssid) {
 986                         /* Use wildcard SSID to find this network */
 987                         wildcard = 1;
 988                 } else if (!wpas_network_disabled(wpa_s, ssid) &&
 989                            ssid->ssid_len)
 990                         need_ssids++;
 991
 992 #ifdef CONFIG_WPS
 993                 if (!wpas_network_disabled(wpa_s, ssid) &&
 994                     ssid->key_mgmt == WPA_KEY_MGMT_WPS) {
 995                         /*
 996                          * Normal scan is more reliable and faster for WPS
 997                          * operations and since these are for short periods of
 998                          * time, the benefit of trying to use sched_scan would
 999                          * be limited.
1000                          */
1001                         wpa_dbg(wpa_s, MSG_DEBUG, "Use normal scan instead of "
1002                                 "sched_scan for WPS");
1003                         return -1;
1004                 }
1005 #endif /* CONFIG_WPS */
1006         }
1007         if (wildcard)
1008                 need_ssids++;
1009
1010         if (wpa_s->normal_scans < 3 &&
1011             (need_ssids <= wpa_s->max_scan_ssids ||
1012              wpa_s->max_scan_ssids >= (int) max_sched_scan_ssids)) {
1013                 /*
1014                  * When normal scan can speed up operations, use that for the
1015                  * first operations before starting the sched_scan to allow
1016                  * user space sleep more. We do this only if the normal scan
1017                  * has functionality that is suitable for this or if the
1018                  * sched_scan does not have better support for multiple SSIDs.
1019                  */
1020                 wpa_dbg(wpa_s, MSG_DEBUG, "Use normal scan instead of "
1021                         "sched_scan for initial scans (normal_scans=%d)",
1022                         wpa_s->normal_scans);
1023                 return -1;
1024         }
1025
1026         os_memset(&params, 0, sizeof(params));
1027
1028         /* If we can't allocate space for the filters, we just don't filter */
1029         params.filter_ssids = os_zalloc(wpa_s->max_match_sets *
1030                                         sizeof(struct wpa_driver_scan_filter));
1031
1032         prev_state = wpa_s->wpa_state;
1033         if (wpa_s->wpa_state == WPA_DISCONNECTED ||
1034             wpa_s->wpa_state == WPA_INACTIVE)
1035                 wpa_supplicant_set_state(wpa_s, WPA_SCANNING);
1036
1037         if (wpa_s->autoscan_params != NULL) {
1038                 scan_params = wpa_s->autoscan_params;
1039                 goto scan;
1040         }
1041
1042         /* Find the starting point from which to continue scanning */
1043         ssid = wpa_s->conf->ssid;
1044         if (wpa_s->prev_sched_ssid) {
1045                 while (ssid) {
1046                         if (ssid == wpa_s->prev_sched_ssid) {
1047                                 ssid = ssid->next;
1048                                 break;
1049                         }
1050                         ssid = ssid->next;
1051                 }
1052         }
1053
1054         if (!ssid || !wpa_s->prev_sched_ssid) {
1055                 wpa_dbg(wpa_s, MSG_DEBUG, "Beginning of SSID list");
1056                 if (wpa_s->conf->sched_scan_interval)
1057                         wpa_s->sched_scan_interval =
1058                                 wpa_s->conf->sched_scan_interval;
1059                 if (wpa_s->sched_scan_interval == 0)
1060                         wpa_s->sched_scan_interval = 10;
1061                 wpa_s->sched_scan_timeout = max_sched_scan_ssids * 2;
1062                 wpa_s->first_sched_scan = 1;
1063                 ssid = wpa_s->conf->ssid;
1064                 wpa_s->prev_sched_ssid = ssid;
1065         }
1066
1067         if (wildcard) {
1068                 wpa_dbg(wpa_s, MSG_DEBUG, "Add wildcard SSID to sched_scan");
1069                 params.num_ssids++;
1070         }
1071
1072         while (ssid) {
1073                 if (wpas_network_disabled(wpa_s, ssid))
1074                         goto next;
1075
1076                 if (params.num_filter_ssids < wpa_s->max_match_sets &&
1077                     params.filter_ssids && ssid->ssid && ssid->ssid_len) {
1078                         wpa_dbg(wpa_s, MSG_DEBUG, "add to filter ssid: %s",
1079                                 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
1080                         os_memcpy(params.filter_ssids[params.num_filter_ssids].ssid,
1081                                   ssid->ssid, ssid->ssid_len);
1082                         params.filter_ssids[params.num_filter_ssids].ssid_len =
1083                                 ssid->ssid_len;
1084                         params.num_filter_ssids++;
1085                 } else if (params.filter_ssids && ssid->ssid && ssid->ssid_len)
1086                 {
1087                         wpa_dbg(wpa_s, MSG_DEBUG, "Not enough room for SSID "
1088                                 "filter for sched_scan - drop filter");
1089                         os_free(params.filter_ssids);
1090                         params.filter_ssids = NULL;
1091                         params.num_filter_ssids = 0;
1092                 }
1093
1094                 if (ssid->scan_ssid && ssid->ssid && ssid->ssid_len) {
1095                         if (params.num_ssids == max_sched_scan_ssids)
1096                                 break; /* only room for broadcast SSID */
1097                         wpa_dbg(wpa_s, MSG_DEBUG,
1098                                 "add to active scan ssid: %s",
1099                                 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
1100                         params.ssids[params.num_ssids].ssid =
1101                                 ssid->ssid;
1102                         params.ssids[params.num_ssids].ssid_len =
1103                                 ssid->ssid_len;
1104                         params.num_ssids++;
1105                         if (params.num_ssids >= max_sched_scan_ssids) {
1106                                 wpa_s->prev_sched_ssid = ssid;
1107                                 do {
1108                                         ssid = ssid->next;
1109                                 } while (ssid &&
1110                                          (wpas_network_disabled(wpa_s, ssid) ||
1111                                           !ssid->scan_ssid));
1112                                 break;
1113                         }
1114                 }
1115
1116         next:
1117                 wpa_s->prev_sched_ssid = ssid;
1118                 ssid = ssid->next;
1119         }
1120
1121         if (params.num_filter_ssids == 0) {
1122                 os_free(params.filter_ssids);
1123                 params.filter_ssids = NULL;
1124         }
1125
1126         extra_ie = wpa_supplicant_extra_ies(wpa_s);
1127         if (extra_ie) {
1128                 params.extra_ies = wpabuf_head(extra_ie);
1129                 params.extra_ies_len = wpabuf_len(extra_ie);
1130         }
1131
1132         if (wpa_s->conf->filter_rssi)
1133                 params.filter_rssi = wpa_s->conf->filter_rssi;
1134
1135         scan_params = &params;
1136
1137 scan:
1138         if (ssid || !wpa_s->first_sched_scan) {
1139                 wpa_dbg(wpa_s, MSG_DEBUG,
1140                         "Starting sched scan: interval %d timeout %d",
1141                         wpa_s->sched_scan_interval, wpa_s->sched_scan_timeout);
1142         } else {
1143                 wpa_dbg(wpa_s, MSG_DEBUG,
1144                         "Starting sched scan: interval %d (no timeout)",
1145                         wpa_s->sched_scan_interval);
1146         }
1147
1148         wpa_setband_scan_freqs(wpa_s, scan_params);
1149
1150         ret = wpa_supplicant_start_sched_scan(wpa_s, scan_params,
1151                                               wpa_s->sched_scan_interval);
1152         wpabuf_free(extra_ie);
1153         os_free(params.filter_ssids);
1154         if (ret) {
1155                 wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate sched scan");
1156                 if (prev_state != wpa_s->wpa_state)
1157                         wpa_supplicant_set_state(wpa_s, prev_state);
1158                 return ret;
1159         }
1160
1161         /* If we have more SSIDs to scan, add a timeout so we scan them too */
1162         if (ssid || !wpa_s->first_sched_scan) {
1163                 wpa_s->sched_scan_timed_out = 0;
1164                 eloop_register_timeout(wpa_s->sched_scan_timeout, 0,
1165                                        wpa_supplicant_sched_scan_timeout,
1166                                        wpa_s, NULL);
1167                 wpa_s->first_sched_scan = 0;
1168                 wpa_s->sched_scan_timeout /= 2;
1169                 wpa_s->sched_scan_interval *= 2;
1170                 if (wpa_s->sched_scan_timeout < wpa_s->sched_scan_interval) {
1171                         wpa_s->sched_scan_interval = 10;
1172                         wpa_s->sched_scan_timeout = max_sched_scan_ssids * 2;
1173                 }
1174         }
1175
1176         /* If there is no more ssids, start next time from the beginning */
1177         if (!ssid)
1178                 wpa_s->prev_sched_ssid = NULL;
1179
1180         return 0;
1181 }
1182
1183
1184 /**
1185  * wpa_supplicant_cancel_scan - Cancel a scheduled scan request
1186  * @wpa_s: Pointer to wpa_supplicant data
1187  *
1188  * This function is used to cancel a scan request scheduled with
1189  * wpa_supplicant_req_scan().
1190  */
1191 void wpa_supplicant_cancel_scan(struct wpa_supplicant *wpa_s)
1192 {
1193         wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling scan request");
1194         eloop_cancel_timeout(wpa_supplicant_scan, wpa_s, NULL);
1195 }
1196
1197
1198 /**
1199  * wpa_supplicant_cancel_delayed_sched_scan - Stop a delayed scheduled scan
1200  * @wpa_s: Pointer to wpa_supplicant data
1201  *
1202  * This function is used to stop a delayed scheduled scan.
1203  */
1204 void wpa_supplicant_cancel_delayed_sched_scan(struct wpa_supplicant *wpa_s)
1205 {
1206         if (!wpa_s->sched_scan_supported)
1207                 return;
1208
1209         wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling delayed sched scan");
1210         eloop_cancel_timeout(wpa_supplicant_delayed_sched_scan_timeout,
1211                              wpa_s, NULL);
1212 }
1213
1214
1215 /**
1216  * wpa_supplicant_cancel_sched_scan - Stop running scheduled scans
1217  * @wpa_s: Pointer to wpa_supplicant data
1218  *
1219  * This function is used to stop a periodic scheduled scan.
1220  */
1221 void wpa_supplicant_cancel_sched_scan(struct wpa_supplicant *wpa_s)
1222 {
1223         if (!wpa_s->sched_scanning)
1224                 return;
1225
1226         wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling sched scan");
1227         eloop_cancel_timeout(wpa_supplicant_sched_scan_timeout, wpa_s, NULL);
1228         wpa_supplicant_stop_sched_scan(wpa_s);
1229 }
1230
1231
1232 /**
1233  * wpa_supplicant_notify_scanning - Indicate possible scan state change
1234  * @wpa_s: Pointer to wpa_supplicant data
1235  * @scanning: Whether scanning is currently in progress
1236  *
1237  * This function is to generate scanning notifycations. It is called whenever
1238  * there may have been a change in scanning (scan started, completed, stopped).
1239  * wpas_notify_scanning() is called whenever the scanning state changed from the
1240  * previously notified state.
1241  */
1242 void wpa_supplicant_notify_scanning(struct wpa_supplicant *wpa_s,
1243                                     int scanning)
1244 {
1245         if (wpa_s->scanning != scanning) {
1246                 wpa_s->scanning = scanning;
1247                 wpas_notify_scanning(wpa_s);
1248         }
1249 }
1250
1251
1252 static int wpa_scan_get_max_rate(const struct wpa_scan_res *res)
1253 {
1254         int rate = 0;
1255         const u8 *ie;
1256         int i;
1257
1258         ie = wpa_scan_get_ie(res, WLAN_EID_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         ie = wpa_scan_get_ie(res, WLAN_EID_EXT_SUPP_RATES);
1265         for (i = 0; ie && i < ie[1]; i++) {
1266                 if ((ie[i + 2] & 0x7f) > rate)
1267                         rate = ie[i + 2] & 0x7f;
1268         }
1269
1270         return rate;
1271 }
1272
1273
1274 /**
1275  * wpa_scan_get_ie - Fetch a specified information element from a scan result
1276  * @res: Scan result entry
1277  * @ie: Information element identitifier (WLAN_EID_*)
1278  * Returns: Pointer to the information element (id field) or %NULL if not found
1279  *
1280  * This function returns the first matching information element in the scan
1281  * result.
1282  */
1283 const u8 * wpa_scan_get_ie(const struct wpa_scan_res *res, u8 ie)
1284 {
1285         const u8 *end, *pos;
1286
1287         pos = (const u8 *) (res + 1);
1288         end = pos + res->ie_len;
1289
1290         while (pos + 1 < end) {
1291                 if (pos + 2 + pos[1] > end)
1292                         break;
1293                 if (pos[0] == ie)
1294                         return pos;
1295                 pos += 2 + pos[1];
1296         }
1297
1298         return NULL;
1299 }
1300
1301
1302 /**
1303  * wpa_scan_get_vendor_ie - Fetch vendor information element from a scan result
1304  * @res: Scan result entry
1305  * @vendor_type: Vendor type (four octets starting the IE payload)
1306  * Returns: Pointer to the information element (id field) or %NULL if not found
1307  *
1308  * This function returns the first matching information element in the scan
1309  * result.
1310  */
1311 const u8 * wpa_scan_get_vendor_ie(const struct wpa_scan_res *res,
1312                                   u32 vendor_type)
1313 {
1314         const u8 *end, *pos;
1315
1316         pos = (const u8 *) (res + 1);
1317         end = pos + res->ie_len;
1318
1319         while (pos + 1 < end) {
1320                 if (pos + 2 + pos[1] > end)
1321                         break;
1322                 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1323                     vendor_type == WPA_GET_BE32(&pos[2]))
1324                         return pos;
1325                 pos += 2 + pos[1];
1326         }
1327
1328         return NULL;
1329 }
1330
1331
1332 /**
1333  * wpa_scan_get_vendor_ie_beacon - Fetch vendor information from a scan result
1334  * @res: Scan result entry
1335  * @vendor_type: Vendor type (four octets starting the IE payload)
1336  * Returns: Pointer to the information element (id field) or %NULL if not found
1337  *
1338  * This function returns the first matching information element in the scan
1339  * result.
1340  *
1341  * This function is like wpa_scan_get_vendor_ie(), but uses IE buffer only
1342  * from Beacon frames instead of either Beacon or Probe Response frames.
1343  */
1344 const u8 * wpa_scan_get_vendor_ie_beacon(const struct wpa_scan_res *res,
1345                                          u32 vendor_type)
1346 {
1347         const u8 *end, *pos;
1348
1349         if (res->beacon_ie_len == 0)
1350                 return NULL;
1351
1352         pos = (const u8 *) (res + 1);
1353         pos += res->ie_len;
1354         end = pos + res->beacon_ie_len;
1355
1356         while (pos + 1 < end) {
1357                 if (pos + 2 + pos[1] > end)
1358                         break;
1359                 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1360                     vendor_type == WPA_GET_BE32(&pos[2]))
1361                         return pos;
1362                 pos += 2 + pos[1];
1363         }
1364
1365         return NULL;
1366 }
1367
1368
1369 /**
1370  * wpa_scan_get_vendor_ie_multi - Fetch vendor IE data from a scan result
1371  * @res: Scan result entry
1372  * @vendor_type: Vendor type (four octets starting the IE payload)
1373  * Returns: Pointer to the information element payload or %NULL if not found
1374  *
1375  * This function returns concatenated payload of possibly fragmented vendor
1376  * specific information elements in the scan result. The caller is responsible
1377  * for freeing the returned buffer.
1378  */
1379 struct wpabuf * wpa_scan_get_vendor_ie_multi(const struct wpa_scan_res *res,
1380                                              u32 vendor_type)
1381 {
1382         struct wpabuf *buf;
1383         const u8 *end, *pos;
1384
1385         buf = wpabuf_alloc(res->ie_len);
1386         if (buf == NULL)
1387                 return NULL;
1388
1389         pos = (const u8 *) (res + 1);
1390         end = pos + res->ie_len;
1391
1392         while (pos + 1 < end) {
1393                 if (pos + 2 + pos[1] > end)
1394                         break;
1395                 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1396                     vendor_type == WPA_GET_BE32(&pos[2]))
1397                         wpabuf_put_data(buf, pos + 2 + 4, pos[1] - 4);
1398                 pos += 2 + pos[1];
1399         }
1400
1401         if (wpabuf_len(buf) == 0) {
1402                 wpabuf_free(buf);
1403                 buf = NULL;
1404         }
1405
1406         return buf;
1407 }
1408
1409
1410 /*
1411  * Channels with a great SNR can operate at full rate. What is a great SNR?
1412  * This doc https://supportforums.cisco.com/docs/DOC-12954 says, "the general
1413  * rule of thumb is that any SNR above 20 is good." This one
1414  * http://www.cisco.com/en/US/tech/tk722/tk809/technologies_q_and_a_item09186a00805e9a96.shtml#qa23
1415  * recommends 25 as a minimum SNR for 54 Mbps data rate. 30 is chosen here as a
1416  * conservative value.
1417  */
1418 #define GREAT_SNR 30
1419
1420 /* Compare function for sorting scan results. Return >0 if @b is considered
1421  * better. */
1422 static int wpa_scan_result_compar(const void *a, const void *b)
1423 {
1424 #define IS_5GHZ(n) (n > 4000)
1425 #define MIN(a,b) a < b ? a : b
1426         struct wpa_scan_res **_wa = (void *) a;
1427         struct wpa_scan_res **_wb = (void *) b;
1428         struct wpa_scan_res *wa = *_wa;
1429         struct wpa_scan_res *wb = *_wb;
1430         int wpa_a, wpa_b, maxrate_a, maxrate_b;
1431         int snr_a, snr_b;
1432
1433         /* WPA/WPA2 support preferred */
1434         wpa_a = wpa_scan_get_vendor_ie(wa, WPA_IE_VENDOR_TYPE) != NULL ||
1435                 wpa_scan_get_ie(wa, WLAN_EID_RSN) != NULL;
1436         wpa_b = wpa_scan_get_vendor_ie(wb, WPA_IE_VENDOR_TYPE) != NULL ||
1437                 wpa_scan_get_ie(wb, WLAN_EID_RSN) != NULL;
1438
1439         if (wpa_b && !wpa_a)
1440                 return 1;
1441         if (!wpa_b && wpa_a)
1442                 return -1;
1443
1444         /* privacy support preferred */
1445         if ((wa->caps & IEEE80211_CAP_PRIVACY) == 0 &&
1446             (wb->caps & IEEE80211_CAP_PRIVACY))
1447                 return 1;
1448         if ((wa->caps & IEEE80211_CAP_PRIVACY) &&
1449             (wb->caps & IEEE80211_CAP_PRIVACY) == 0)
1450                 return -1;
1451
1452         if ((wa->flags & wb->flags & WPA_SCAN_LEVEL_DBM) &&
1453             !((wa->flags | wb->flags) & WPA_SCAN_NOISE_INVALID)) {
1454                 snr_a = MIN(wa->level - wa->noise, GREAT_SNR);
1455                 snr_b = MIN(wb->level - wb->noise, GREAT_SNR);
1456         } else {
1457                 /* Not suitable information to calculate SNR, so use level */
1458                 snr_a = wa->level;
1459                 snr_b = wb->level;
1460         }
1461
1462         /* best/max rate preferred if SNR close enough */
1463         if ((snr_a && snr_b && abs(snr_b - snr_a) < 5) ||
1464             (wa->qual && wb->qual && abs(wb->qual - wa->qual) < 10)) {
1465                 maxrate_a = wpa_scan_get_max_rate(wa);
1466                 maxrate_b = wpa_scan_get_max_rate(wb);
1467                 if (maxrate_a != maxrate_b)
1468                         return maxrate_b - maxrate_a;
1469                 if (IS_5GHZ(wa->freq) ^ IS_5GHZ(wb->freq))
1470                         return IS_5GHZ(wa->freq) ? -1 : 1;
1471         }
1472
1473         /* use freq for channel preference */
1474
1475         /* all things being equal, use SNR; if SNRs are
1476          * identical, use quality values since some drivers may only report
1477          * that value and leave the signal level zero */
1478         if (snr_b == snr_a)
1479                 return wb->qual - wa->qual;
1480         return snr_b - snr_a;
1481 #undef MIN
1482 #undef IS_5GHZ
1483 }
1484
1485
1486 #ifdef CONFIG_WPS
1487 /* Compare function for sorting scan results when searching a WPS AP for
1488  * provisioning. Return >0 if @b is considered better. */
1489 static int wpa_scan_result_wps_compar(const void *a, const void *b)
1490 {
1491         struct wpa_scan_res **_wa = (void *) a;
1492         struct wpa_scan_res **_wb = (void *) b;
1493         struct wpa_scan_res *wa = *_wa;
1494         struct wpa_scan_res *wb = *_wb;
1495         int uses_wps_a, uses_wps_b;
1496         struct wpabuf *wps_a, *wps_b;
1497         int res;
1498
1499         /* Optimization - check WPS IE existence before allocated memory and
1500          * doing full reassembly. */
1501         uses_wps_a = wpa_scan_get_vendor_ie(wa, WPS_IE_VENDOR_TYPE) != NULL;
1502         uses_wps_b = wpa_scan_get_vendor_ie(wb, WPS_IE_VENDOR_TYPE) != NULL;
1503         if (uses_wps_a && !uses_wps_b)
1504                 return -1;
1505         if (!uses_wps_a && uses_wps_b)
1506                 return 1;
1507
1508         if (uses_wps_a && uses_wps_b) {
1509                 wps_a = wpa_scan_get_vendor_ie_multi(wa, WPS_IE_VENDOR_TYPE);
1510                 wps_b = wpa_scan_get_vendor_ie_multi(wb, WPS_IE_VENDOR_TYPE);
1511                 res = wps_ap_priority_compar(wps_a, wps_b);
1512                 wpabuf_free(wps_a);
1513                 wpabuf_free(wps_b);
1514                 if (res)
1515                         return res;
1516         }
1517
1518         /*
1519          * Do not use current AP security policy as a sorting criteria during
1520          * WPS provisioning step since the AP may get reconfigured at the
1521          * completion of provisioning.
1522          */
1523
1524         /* all things being equal, use signal level; if signal levels are
1525          * identical, use quality values since some drivers may only report
1526          * that value and leave the signal level zero */
1527         if (wb->level == wa->level)
1528                 return wb->qual - wa->qual;
1529         return wb->level - wa->level;
1530 }
1531 #endif /* CONFIG_WPS */
1532
1533
1534 static void dump_scan_res(struct wpa_scan_results *scan_res)
1535 {
1536 #ifndef CONFIG_NO_STDOUT_DEBUG
1537         size_t i;
1538
1539         if (scan_res->res == NULL || scan_res->num == 0)
1540                 return;
1541
1542         wpa_printf(MSG_EXCESSIVE, "Sorted scan results");
1543
1544         for (i = 0; i < scan_res->num; i++) {
1545                 struct wpa_scan_res *r = scan_res->res[i];
1546                 u8 *pos;
1547                 if ((r->flags & (WPA_SCAN_LEVEL_DBM | WPA_SCAN_NOISE_INVALID))
1548                     == WPA_SCAN_LEVEL_DBM) {
1549                         int snr = r->level - r->noise;
1550                         wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d "
1551                                    "noise=%d level=%d snr=%d%s flags=0x%x "
1552                                    "age=%u",
1553                                    MAC2STR(r->bssid), r->freq, r->qual,
1554                                    r->noise, r->level, snr,
1555                                    snr >= GREAT_SNR ? "*" : "", r->flags,
1556                                    r->age);
1557                 } else {
1558                         wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d "
1559                                    "noise=%d level=%d flags=0x%x age=%u",
1560                                    MAC2STR(r->bssid), r->freq, r->qual,
1561                                    r->noise, r->level, r->flags, r->age);
1562                 }
1563                 pos = (u8 *) (r + 1);
1564                 if (r->ie_len)
1565                         wpa_hexdump(MSG_EXCESSIVE, "IEs", pos, r->ie_len);
1566                 pos += r->ie_len;
1567                 if (r->beacon_ie_len)
1568                         wpa_hexdump(MSG_EXCESSIVE, "Beacon IEs",
1569                                     pos, r->beacon_ie_len);
1570         }
1571 #endif /* CONFIG_NO_STDOUT_DEBUG */
1572 }
1573
1574
1575 /**
1576  * wpa_supplicant_filter_bssid_match - Is the specified BSSID allowed
1577  * @wpa_s: Pointer to wpa_supplicant data
1578  * @bssid: BSSID to check
1579  * Returns: 0 if the BSSID is filtered or 1 if not
1580  *
1581  * This function is used to filter out specific BSSIDs from scan reslts mainly
1582  * for testing purposes (SET bssid_filter ctrl_iface command).
1583  */
1584 int wpa_supplicant_filter_bssid_match(struct wpa_supplicant *wpa_s,
1585                                       const u8 *bssid)
1586 {
1587         size_t i;
1588
1589         if (wpa_s->bssid_filter == NULL)
1590                 return 1;
1591
1592         for (i = 0; i < wpa_s->bssid_filter_count; i++) {
1593                 if (os_memcmp(wpa_s->bssid_filter + i * ETH_ALEN, bssid,
1594                               ETH_ALEN) == 0)
1595                         return 1;
1596         }
1597
1598         return 0;
1599 }
1600
1601
1602 static void filter_scan_res(struct wpa_supplicant *wpa_s,
1603                             struct wpa_scan_results *res)
1604 {
1605         size_t i, j;
1606
1607         if (wpa_s->bssid_filter == NULL)
1608                 return;
1609
1610         for (i = 0, j = 0; i < res->num; i++) {
1611                 if (wpa_supplicant_filter_bssid_match(wpa_s,
1612                                                       res->res[i]->bssid)) {
1613                         res->res[j++] = res->res[i];
1614                 } else {
1615                         os_free(res->res[i]);
1616                         res->res[i] = NULL;
1617                 }
1618         }
1619
1620         if (res->num != j) {
1621                 wpa_printf(MSG_DEBUG, "Filtered out %d scan results",
1622                            (int) (res->num - j));
1623                 res->num = j;
1624         }
1625 }
1626
1627
1628 /**
1629  * wpa_supplicant_get_scan_results - Get scan results
1630  * @wpa_s: Pointer to wpa_supplicant data
1631  * @info: Information about what was scanned or %NULL if not available
1632  * @new_scan: Whether a new scan was performed
1633  * Returns: Scan results, %NULL on failure
1634  *
1635  * This function request the current scan results from the driver and updates
1636  * the local BSS list wpa_s->bss. The caller is responsible for freeing the
1637  * results with wpa_scan_results_free().
1638  */
1639 struct wpa_scan_results *
1640 wpa_supplicant_get_scan_results(struct wpa_supplicant *wpa_s,
1641                                 struct scan_info *info, int new_scan)
1642 {
1643         struct wpa_scan_results *scan_res;
1644         size_t i;
1645         int (*compar)(const void *, const void *) = wpa_scan_result_compar;
1646
1647         scan_res = wpa_drv_get_scan_results2(wpa_s);
1648         if (scan_res == NULL) {
1649                 wpa_dbg(wpa_s, MSG_DEBUG, "Failed to get scan results");
1650                 return NULL;
1651         }
1652         if (scan_res->fetch_time.sec == 0) {
1653                 /*
1654                  * Make sure we have a valid timestamp if the driver wrapper
1655                  * does not set this.
1656                  */
1657                 os_get_reltime(&scan_res->fetch_time);
1658         }
1659         filter_scan_res(wpa_s, scan_res);
1660
1661 #ifdef CONFIG_WPS
1662         if (wpas_wps_searching(wpa_s)) {
1663                 wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Order scan results with WPS "
1664                         "provisioning rules");
1665                 compar = wpa_scan_result_wps_compar;
1666         }
1667 #endif /* CONFIG_WPS */
1668
1669         qsort(scan_res->res, scan_res->num, sizeof(struct wpa_scan_res *),
1670               compar);
1671         dump_scan_res(scan_res);
1672
1673         wpa_bss_update_start(wpa_s);
1674         for (i = 0; i < scan_res->num; i++)
1675                 wpa_bss_update_scan_res(wpa_s, scan_res->res[i],
1676                                         &scan_res->fetch_time);
1677         wpa_bss_update_end(wpa_s, info, new_scan);
1678
1679         return scan_res;
1680 }
1681
1682
1683 /**
1684  * wpa_supplicant_update_scan_results - Update scan results from the driver
1685  * @wpa_s: Pointer to wpa_supplicant data
1686  * Returns: 0 on success, -1 on failure
1687  *
1688  * This function updates the BSS table within wpa_supplicant based on the
1689  * currently available scan results from the driver without requesting a new
1690  * scan. This is used in cases where the driver indicates an association
1691  * (including roaming within ESS) and wpa_supplicant does not yet have the
1692  * needed information to complete the connection (e.g., to perform validation
1693  * steps in 4-way handshake).
1694  */
1695 int wpa_supplicant_update_scan_results(struct wpa_supplicant *wpa_s)
1696 {
1697         struct wpa_scan_results *scan_res;
1698         scan_res = wpa_supplicant_get_scan_results(wpa_s, NULL, 0);
1699         if (scan_res == NULL)
1700                 return -1;
1701         wpa_scan_results_free(scan_res);
1702
1703         return 0;
1704 }
1705
1706
1707 /**
1708  * scan_only_handler - Reports scan results
1709  */
1710 void scan_only_handler(struct wpa_supplicant *wpa_s,
1711                        struct wpa_scan_results *scan_res)
1712 {
1713         wpa_dbg(wpa_s, MSG_DEBUG, "Scan-only results received");
1714         if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
1715             wpa_s->manual_scan_use_id && wpa_s->own_scan_running) {
1716                 wpa_msg_ctrl(wpa_s, MSG_INFO, WPA_EVENT_SCAN_RESULTS "id=%u",
1717                              wpa_s->manual_scan_id);
1718                 wpa_s->manual_scan_use_id = 0;
1719         } else {
1720                 wpa_msg_ctrl(wpa_s, MSG_INFO, WPA_EVENT_SCAN_RESULTS);
1721         }
1722         wpas_notify_scan_results(wpa_s);
1723         wpas_notify_scan_done(wpa_s, 1);
1724         if (wpa_s->scan_work) {
1725                 struct wpa_radio_work *work = wpa_s->scan_work;
1726                 wpa_s->scan_work = NULL;
1727                 radio_work_done(work);
1728         }
1729 }
1730
1731
1732 int wpas_scan_scheduled(struct wpa_supplicant *wpa_s)
1733 {
1734         return eloop_is_timeout_registered(wpa_supplicant_scan, wpa_s, NULL);
1735 }
1736
1737
1738 struct wpa_driver_scan_params *
1739 wpa_scan_clone_params(const struct wpa_driver_scan_params *src)
1740 {
1741         struct wpa_driver_scan_params *params;
1742         size_t i;
1743         u8 *n;
1744
1745         params = os_zalloc(sizeof(*params));
1746         if (params == NULL)
1747                 return NULL;
1748
1749         for (i = 0; i < src->num_ssids; i++) {
1750                 if (src->ssids[i].ssid) {
1751                         n = os_malloc(src->ssids[i].ssid_len);
1752                         if (n == NULL)
1753                                 goto failed;
1754                         os_memcpy(n, src->ssids[i].ssid,
1755                                   src->ssids[i].ssid_len);
1756                         params->ssids[i].ssid = n;
1757                         params->ssids[i].ssid_len = src->ssids[i].ssid_len;
1758                 }
1759         }
1760         params->num_ssids = src->num_ssids;
1761
1762         if (src->extra_ies) {
1763                 n = os_malloc(src->extra_ies_len);
1764                 if (n == NULL)
1765                         goto failed;
1766                 os_memcpy(n, src->extra_ies, src->extra_ies_len);
1767                 params->extra_ies = n;
1768                 params->extra_ies_len = src->extra_ies_len;
1769         }
1770
1771         if (src->freqs) {
1772                 int len = int_array_len(src->freqs);
1773                 params->freqs = os_malloc((len + 1) * sizeof(int));
1774                 if (params->freqs == NULL)
1775                         goto failed;
1776                 os_memcpy(params->freqs, src->freqs, (len + 1) * sizeof(int));
1777         }
1778
1779         if (src->filter_ssids) {
1780                 params->filter_ssids = os_malloc(sizeof(*params->filter_ssids) *
1781                                                  src->num_filter_ssids);
1782                 if (params->filter_ssids == NULL)
1783                         goto failed;
1784                 os_memcpy(params->filter_ssids, src->filter_ssids,
1785                           sizeof(*params->filter_ssids) *
1786                           src->num_filter_ssids);
1787                 params->num_filter_ssids = src->num_filter_ssids;
1788         }
1789
1790         params->filter_rssi = src->filter_rssi;
1791         params->p2p_probe = src->p2p_probe;
1792         params->only_new_results = src->only_new_results;
1793
1794         return params;
1795
1796 failed:
1797         wpa_scan_free_params(params);
1798         return NULL;
1799 }
1800
1801
1802 void wpa_scan_free_params(struct wpa_driver_scan_params *params)
1803 {
1804         size_t i;
1805
1806         if (params == NULL)
1807                 return;
1808
1809         for (i = 0; i < params->num_ssids; i++)
1810                 os_free((u8 *) params->ssids[i].ssid);
1811         os_free((u8 *) params->extra_ies);
1812         os_free(params->freqs);
1813         os_free(params->filter_ssids);
1814         os_free(params);
1815 }