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 #include "mesh.h"
  26
  27
  28 static void wpa_supplicant_gen_assoc_event(struct wpa_supplicant *wpa_s)
  29 {
  30         struct wpa_ssid *ssid;
  31         union wpa_event_data data;
  32
  33         ssid = wpa_supplicant_get_ssid(wpa_s);
  34         if (ssid == NULL)
  35                 return;
  36
  37         if (wpa_s->current_ssid == NULL) {
  38                 wpa_s->current_ssid = ssid;
  39                 if (wpa_s->current_ssid != NULL)
  40                         wpas_notify_network_changed(wpa_s);
  41         }
  42         wpa_supplicant_initiate_eapol(wpa_s);
  43         wpa_dbg(wpa_s, MSG_DEBUG, "Already associated with a configured "
  44                 "network - generating associated event");
  45         os_memset(&data, 0, sizeof(data));
  46         wpa_supplicant_event(wpa_s, EVENT_ASSOC, &data);
  47 }
  48
  49
  50 #ifdef CONFIG_WPS
  51 static int wpas_wps_in_use(struct wpa_supplicant *wpa_s,
  52                            enum wps_request_type *req_type)
  53 {
  54         struct wpa_ssid *ssid;
  55         int wps = 0;
  56
  57         for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
  58                 if (!(ssid->key_mgmt & WPA_KEY_MGMT_WPS))
  59                         continue;
  60
  61                 wps = 1;
  62                 *req_type = wpas_wps_get_req_type(ssid);
  63                 if (!ssid->eap.phase1)
  64                         continue;
  65
  66                 if (os_strstr(ssid->eap.phase1, "pbc=1"))
  67                         return 2;
  68         }
  69
  70 #ifdef CONFIG_P2P
  71         if (!wpa_s->global->p2p_disabled && wpa_s->global->p2p &&
  72             !wpa_s->conf->p2p_disabled) {
  73                 wpa_s->wps->dev.p2p = 1;
  74                 if (!wps) {
  75                         wps = 1;
  76                         *req_type = WPS_REQ_ENROLLEE_INFO;
  77                 }
  78         }
  79 #endif /* CONFIG_P2P */
  80
  81         return wps;
  82 }
  83 #endif /* CONFIG_WPS */
  84
  85
  86 /**
  87  * wpa_supplicant_enabled_networks - Check whether there are enabled networks
  88  * @wpa_s: Pointer to wpa_supplicant data
  89  * Returns: 0 if no networks are enabled, >0 if networks are enabled
  90  *
  91  * This function is used to figure out whether any networks (or Interworking
  92  * with enabled credentials and auto_interworking) are present in the current
  93  * configuration.
  94  */
  95 int wpa_supplicant_enabled_networks(struct wpa_supplicant *wpa_s)
  96 {
  97         struct wpa_ssid *ssid = wpa_s->conf->ssid;
  98         int count = 0, disabled = 0;
  99         while (ssid) {
 100                 if (!wpas_network_disabled(wpa_s, ssid))
 101                         count++;
 102                 else
 103                         disabled++;
 104                 ssid = ssid->next;
 105         }
 106         if (wpa_s->conf->cred && wpa_s->conf->interworking &&
 107             wpa_s->conf->auto_interworking)
 108                 count++;
 109         if (count == 0 && disabled > 0) {
 110                 wpa_dbg(wpa_s, MSG_DEBUG, "No enabled networks (%d disabled "
 111                         "networks)", disabled);
 112         }
 113         return count;
 114 }
 115
 116
 117 static void wpa_supplicant_assoc_try(struct wpa_supplicant *wpa_s,
 118                                      struct wpa_ssid *ssid)
 119 {
 120         while (ssid) {
 121                 if (!wpas_network_disabled(wpa_s, ssid))
 122                         break;
 123                 ssid = ssid->next;
 124         }
 125
 126         /* ap_scan=2 mode - try to associate with each SSID. */
 127         if (ssid == NULL) {
 128                 wpa_dbg(wpa_s, MSG_DEBUG, "wpa_supplicant_assoc_try: Reached "
 129                         "end of scan list - go back to beginning");
 130                 wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
 131                 wpa_supplicant_req_scan(wpa_s, 0, 0);
 132                 return;
 133         }
 134         if (ssid->next) {
 135                 /* Continue from the next SSID on the next attempt. */
 136                 wpa_s->prev_scan_ssid = ssid;
 137         } else {
 138                 /* Start from the beginning of the SSID list. */
 139                 wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
 140         }
 141         wpa_supplicant_associate(wpa_s, NULL, ssid);
 142 }
 143
 144
 145 static void wpas_trigger_scan_cb(struct wpa_radio_work *work, int deinit)
 146 {
 147         struct wpa_supplicant *wpa_s = work->wpa_s;
 148         struct wpa_driver_scan_params *params = work->ctx;
 149         int ret;
 150
 151         if (deinit) {
 152                 if (!work->started) {
 153                         wpa_scan_free_params(params);
 154                         return;
 155                 }
 156                 wpa_supplicant_notify_scanning(wpa_s, 0);
 157                 wpas_notify_scan_done(wpa_s, 0);
 158                 wpa_s->scan_work = NULL;
 159                 return;
 160         }
 161
 162         if (wpas_update_random_addr_disassoc(wpa_s) < 0) {
 163                 wpa_msg(wpa_s, MSG_INFO,
 164                         "Failed to assign random MAC address for a scan");
 165                 radio_work_done(work);
 166                 return;
 167         }
 168
 169         wpa_supplicant_notify_scanning(wpa_s, 1);
 170
 171         if (wpa_s->clear_driver_scan_cache)
 172                 params->only_new_results = 1;
 173         ret = wpa_drv_scan(wpa_s, params);
 174         wpa_scan_free_params(params);
 175         work->ctx = NULL;
 176         if (ret) {
 177                 wpa_supplicant_notify_scanning(wpa_s, 0);
 178                 wpas_notify_scan_done(wpa_s, 0);
 179                 radio_work_done(work);
 180                 return;
 181         }
 182
 183         os_get_reltime(&wpa_s->scan_trigger_time);
 184         wpa_s->scan_runs++;
 185         wpa_s->normal_scans++;
 186         wpa_s->own_scan_requested = 1;
 187         wpa_s->clear_driver_scan_cache = 0;
 188         wpa_s->scan_work = work;
 189 }
 190
 191
 192 /**
 193  * wpa_supplicant_trigger_scan - Request driver to start a scan
 194  * @wpa_s: Pointer to wpa_supplicant data
 195  * @params: Scan parameters
 196  * Returns: 0 on success, -1 on failure
 197  */
 198 int wpa_supplicant_trigger_scan(struct wpa_supplicant *wpa_s,
 199                                 struct wpa_driver_scan_params *params)
 200 {
 201         struct wpa_driver_scan_params *ctx;
 202
 203         if (wpa_s->scan_work) {
 204                 wpa_dbg(wpa_s, MSG_INFO, "Reject scan trigger since one is already pending");
 205                 return -1;
 206         }
 207
 208         ctx = wpa_scan_clone_params(params);
 209         if (ctx == NULL)
 210                 return -1;
 211
 212         if (radio_add_work(wpa_s, 0, "scan", 0, wpas_trigger_scan_cb, ctx) < 0)
 213         {
 214                 wpa_scan_free_params(ctx);
 215                 return -1;
 216         }
 217
 218         return 0;
 219 }
 220
 221
 222 static void
 223 wpa_supplicant_delayed_sched_scan_timeout(void *eloop_ctx, void *timeout_ctx)
 224 {
 225         struct wpa_supplicant *wpa_s = eloop_ctx;
 226
 227         wpa_dbg(wpa_s, MSG_DEBUG, "Starting delayed sched scan");
 228
 229         if (wpa_supplicant_req_sched_scan(wpa_s))
 230                 wpa_supplicant_req_scan(wpa_s, 0, 0);
 231 }
 232
 233
 234 static void
 235 wpa_supplicant_sched_scan_timeout(void *eloop_ctx, void *timeout_ctx)
 236 {
 237         struct wpa_supplicant *wpa_s = eloop_ctx;
 238
 239         wpa_dbg(wpa_s, MSG_DEBUG, "Sched scan timeout - stopping it");
 240
 241         wpa_s->sched_scan_timed_out = 1;
 242         wpa_supplicant_cancel_sched_scan(wpa_s);
 243 }
 244
 245
 246 int wpa_supplicant_start_sched_scan(struct wpa_supplicant *wpa_s,
 247                                     struct wpa_driver_scan_params *params,
 248                                     int interval)
 249 {
 250         int ret;
 251
 252         wpa_supplicant_notify_scanning(wpa_s, 1);
 253         ret = wpa_drv_sched_scan(wpa_s, params, interval * 1000);
 254         if (ret)
 255                 wpa_supplicant_notify_scanning(wpa_s, 0);
 256         else
 257                 wpa_s->sched_scanning = 1;
 258
 259         return ret;
 260 }
 261
 262
 263 int wpa_supplicant_stop_sched_scan(struct wpa_supplicant *wpa_s)
 264 {
 265         int ret;
 266
 267         ret = wpa_drv_stop_sched_scan(wpa_s);
 268         if (ret) {
 269                 wpa_dbg(wpa_s, MSG_DEBUG, "stopping sched_scan failed!");
 270                 /* TODO: what to do if stopping fails? */
 271                 return -1;
 272         }
 273
 274         return ret;
 275 }
 276
 277
 278 static struct wpa_driver_scan_filter *
 279 wpa_supplicant_build_filter_ssids(struct wpa_config *conf, size_t *num_ssids)
 280 {
 281         struct wpa_driver_scan_filter *ssids;
 282         struct wpa_ssid *ssid;
 283         size_t count;
 284
 285         *num_ssids = 0;
 286         if (!conf->filter_ssids)
 287                 return NULL;
 288
 289         for (count = 0, ssid = conf->ssid; ssid; ssid = ssid->next) {
 290                 if (ssid->ssid && ssid->ssid_len)
 291                         count++;
 292         }
 293         if (count == 0)
 294                 return NULL;
 295         ssids = os_zalloc(count * sizeof(struct wpa_driver_scan_filter));
 296         if (ssids == NULL)
 297                 return NULL;
 298
 299         for (ssid = conf->ssid; ssid; ssid = ssid->next) {
 300                 if (!ssid->ssid || !ssid->ssid_len)
 301                         continue;
 302                 os_memcpy(ssids[*num_ssids].ssid, ssid->ssid, ssid->ssid_len);
 303                 ssids[*num_ssids].ssid_len = ssid->ssid_len;
 304                 (*num_ssids)++;
 305         }
 306
 307         return ssids;
 308 }
 309
 310
 311 static void wpa_supplicant_optimize_freqs(
 312         struct wpa_supplicant *wpa_s, struct wpa_driver_scan_params *params)
 313 {
 314 #ifdef CONFIG_P2P
 315         if (params->freqs == NULL && wpa_s->p2p_in_provisioning &&
 316             wpa_s->go_params) {
 317                 /* Optimize provisioning state scan based on GO information */
 318                 if (wpa_s->p2p_in_provisioning < 5 &&
 319                     wpa_s->go_params->freq > 0) {
 320                         wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only GO "
 321                                 "preferred frequency %d MHz",
 322                                 wpa_s->go_params->freq);
 323                         params->freqs = os_zalloc(2 * sizeof(int));
 324                         if (params->freqs)
 325                                 params->freqs[0] = wpa_s->go_params->freq;
 326                 } else if (wpa_s->p2p_in_provisioning < 8 &&
 327                            wpa_s->go_params->freq_list[0]) {
 328                         wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only common "
 329                                 "channels");
 330                         int_array_concat(&params->freqs,
 331                                          wpa_s->go_params->freq_list);
 332                         if (params->freqs)
 333                                 int_array_sort_unique(params->freqs);
 334                 }
 335                 wpa_s->p2p_in_provisioning++;
 336         }
 337
 338         if (params->freqs == NULL && wpa_s->p2p_in_invitation) {
 339                 /*
 340                  * Optimize scan based on GO information during persistent
 341                  * group reinvocation
 342                  */
 343                 if (wpa_s->p2p_in_invitation < 5 &&
 344                     wpa_s->p2p_invite_go_freq > 0) {
 345                         wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only GO preferred frequency %d MHz during invitation",
 346                                 wpa_s->p2p_invite_go_freq);
 347                         params->freqs = os_zalloc(2 * sizeof(int));
 348                         if (params->freqs)
 349                                 params->freqs[0] = wpa_s->p2p_invite_go_freq;
 350                 }
 351                 wpa_s->p2p_in_invitation++;
 352                 if (wpa_s->p2p_in_invitation > 20) {
 353                         /*
 354                          * This should not really happen since the variable is
 355                          * cleared on group removal, but if it does happen, make
 356                          * sure we do not get stuck in special invitation scan
 357                          * mode.
 358                          */
 359                         wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Clear p2p_in_invitation");
 360                         wpa_s->p2p_in_invitation = 0;
 361                 }
 362         }
 363 #endif /* CONFIG_P2P */
 364
 365 #ifdef CONFIG_WPS
 366         if (params->freqs == NULL && wpa_s->after_wps && wpa_s->wps_freq) {
 367                 /*
 368                  * Optimize post-provisioning scan based on channel used
 369                  * during provisioning.
 370                  */
 371                 wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Scan only frequency %u MHz "
 372                         "that was used during provisioning", wpa_s->wps_freq);
 373                 params->freqs = os_zalloc(2 * sizeof(int));
 374                 if (params->freqs)
 375                         params->freqs[0] = wpa_s->wps_freq;
 376                 wpa_s->after_wps--;
 377         } else if (wpa_s->after_wps)
 378                 wpa_s->after_wps--;
 379
 380         if (params->freqs == NULL && wpa_s->known_wps_freq && wpa_s->wps_freq)
 381         {
 382                 /* Optimize provisioning scan based on already known channel */
 383                 wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Scan only frequency %u MHz",
 384                         wpa_s->wps_freq);
 385                 params->freqs = os_zalloc(2 * sizeof(int));
 386                 if (params->freqs)
 387                         params->freqs[0] = wpa_s->wps_freq;
 388                 wpa_s->known_wps_freq = 0; /* only do this once */
 389         }
 390 #endif /* CONFIG_WPS */
 391 }
 392
 393
 394 #ifdef CONFIG_INTERWORKING
 395 static void wpas_add_interworking_elements(struct wpa_supplicant *wpa_s,
 396                                            struct wpabuf *buf)
 397 {
 398         if (wpa_s->conf->interworking == 0)
 399                 return;
 400
 401         wpabuf_put_u8(buf, WLAN_EID_EXT_CAPAB);
 402         wpabuf_put_u8(buf, 6);
 403         wpabuf_put_u8(buf, 0x00);
 404         wpabuf_put_u8(buf, 0x00);
 405         wpabuf_put_u8(buf, 0x00);
 406         wpabuf_put_u8(buf, 0x80); /* Bit 31 - Interworking */
 407         wpabuf_put_u8(buf, 0x00);
 408 #ifdef CONFIG_HS20
 409         wpabuf_put_u8(buf, 0x40); /* Bit 46 - WNM-Notification */
 410 #else /* CONFIG_HS20 */
 411         wpabuf_put_u8(buf, 0x00);
 412 #endif /* CONFIG_HS20 */
 413
 414         wpabuf_put_u8(buf, WLAN_EID_INTERWORKING);
 415         wpabuf_put_u8(buf, is_zero_ether_addr(wpa_s->conf->hessid) ? 1 :
 416                       1 + ETH_ALEN);
 417         wpabuf_put_u8(buf, wpa_s->conf->access_network_type);
 418         /* No Venue Info */
 419         if (!is_zero_ether_addr(wpa_s->conf->hessid))
 420                 wpabuf_put_data(buf, wpa_s->conf->hessid, ETH_ALEN);
 421 }
 422 #endif /* CONFIG_INTERWORKING */
 423
 424
 425 static struct wpabuf * wpa_supplicant_extra_ies(struct wpa_supplicant *wpa_s)
 426 {
 427         struct wpabuf *extra_ie = NULL;
 428 #ifdef CONFIG_WPS
 429         int wps = 0;
 430         enum wps_request_type req_type = WPS_REQ_ENROLLEE_INFO;
 431 #endif /* CONFIG_WPS */
 432
 433 #ifdef CONFIG_INTERWORKING
 434         if (wpa_s->conf->interworking &&
 435             wpabuf_resize(&extra_ie, 100) == 0)
 436                 wpas_add_interworking_elements(wpa_s, extra_ie);
 437 #endif /* CONFIG_INTERWORKING */
 438
 439 #ifdef CONFIG_WPS
 440         wps = wpas_wps_in_use(wpa_s, &req_type);
 441
 442         if (wps) {
 443                 struct wpabuf *wps_ie;
 444                 wps_ie = wps_build_probe_req_ie(wps == 2 ? DEV_PW_PUSHBUTTON :
 445                                                 DEV_PW_DEFAULT,
 446                                                 &wpa_s->wps->dev,
 447                                                 wpa_s->wps->uuid, req_type,
 448                                                 0, NULL);
 449                 if (wps_ie) {
 450                         if (wpabuf_resize(&extra_ie, wpabuf_len(wps_ie)) == 0)
 451                                 wpabuf_put_buf(extra_ie, wps_ie);
 452                         wpabuf_free(wps_ie);
 453                 }
 454         }
 455
 456 #ifdef CONFIG_P2P
 457         if (wps) {
 458                 size_t ielen = p2p_scan_ie_buf_len(wpa_s->global->p2p);
 459                 if (wpabuf_resize(&extra_ie, ielen) == 0)
 460                         wpas_p2p_scan_ie(wpa_s, extra_ie);
 461         }
 462 #endif /* CONFIG_P2P */
 463
 464         wpa_supplicant_mesh_add_scan_ie(wpa_s, &extra_ie);
 465
 466 #endif /* CONFIG_WPS */
 467
 468 #ifdef CONFIG_HS20
 469         if (wpa_s->conf->hs20 && wpabuf_resize(&extra_ie, 7) == 0)
 470                 wpas_hs20_add_indication(extra_ie, -1);
 471 #endif /* CONFIG_HS20 */
 472
 473         return extra_ie;
 474 }
 475
 476
 477 #ifdef CONFIG_P2P
 478
 479 /*
 480  * Check whether there are any enabled networks or credentials that could be
 481  * used for a non-P2P connection.
 482  */
 483 static int non_p2p_network_enabled(struct wpa_supplicant *wpa_s)
 484 {
 485         struct wpa_ssid *ssid;
 486
 487         for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
 488                 if (wpas_network_disabled(wpa_s, ssid))
 489                         continue;
 490                 if (!ssid->p2p_group)
 491                         return 1;
 492         }
 493
 494         if (wpa_s->conf->cred && wpa_s->conf->interworking &&
 495             wpa_s->conf->auto_interworking)
 496                 return 1;
 497
 498         return 0;
 499 }
 500
 501 #endif /* CONFIG_P2P */
 502
 503
 504 static struct hostapd_hw_modes * get_mode(struct hostapd_hw_modes *modes,
 505                                           u16 num_modes,
 506                                           enum hostapd_hw_mode mode)
 507 {
 508         u16 i;
 509
 510         for (i = 0; i < num_modes; i++) {
 511                 if (modes[i].mode == mode)
 512                         return &modes[i];
 513         }
 514
 515         return NULL;
 516 }
 517
 518
 519 static void wpa_setband_scan_freqs_list(struct wpa_supplicant *wpa_s,
 520                                         enum hostapd_hw_mode band,
 521                                         struct wpa_driver_scan_params *params)
 522 {
 523         /* Include only supported channels for the specified band */
 524         struct hostapd_hw_modes *mode;
 525         int count, i;
 526
 527         mode = get_mode(wpa_s->hw.modes, wpa_s->hw.num_modes, band);
 528         if (mode == NULL) {
 529                 /* No channels supported in this band - use empty list */
 530                 params->freqs = os_zalloc(sizeof(int));
 531                 return;
 532         }
 533
 534         params->freqs = os_zalloc((mode->num_channels + 1) * sizeof(int));
 535         if (params->freqs == NULL)
 536                 return;
 537         for (count = 0, i = 0; i < mode->num_channels; i++) {
 538                 if (mode->channels[i].flag & HOSTAPD_CHAN_DISABLED)
 539                         continue;
 540                 params->freqs[count++] = mode->channels[i].freq;
 541         }
 542 }
 543
 544
 545 static void wpa_setband_scan_freqs(struct wpa_supplicant *wpa_s,
 546                                    struct wpa_driver_scan_params *params)
 547 {
 548         if (wpa_s->hw.modes == NULL)
 549                 return; /* unknown what channels the driver supports */
 550         if (params->freqs)
 551                 return; /* already using a limited channel set */
 552         if (wpa_s->setband == WPA_SETBAND_5G)
 553                 wpa_setband_scan_freqs_list(wpa_s, HOSTAPD_MODE_IEEE80211A,
 554                                             params);
 555         else if (wpa_s->setband == WPA_SETBAND_2G)
 556                 wpa_setband_scan_freqs_list(wpa_s, HOSTAPD_MODE_IEEE80211G,
 557                                             params);
 558 }
 559
 560
 561 static void wpa_set_scan_ssids(struct wpa_supplicant *wpa_s,
 562                                struct wpa_driver_scan_params *params,
 563                                size_t max_ssids)
 564 {
 565         unsigned int i;
 566         struct wpa_ssid *ssid;
 567
 568         for (i = 0; i < wpa_s->scan_id_count; i++) {
 569                 unsigned int j;
 570
 571                 ssid = wpa_config_get_network(wpa_s->conf, wpa_s->scan_id[i]);
 572                 if (!ssid || !ssid->scan_ssid)
 573                         continue;
 574
 575                 for (j = 0; j < params->num_ssids; j++) {
 576                         if (params->ssids[j].ssid_len == ssid->ssid_len &&
 577                             params->ssids[j].ssid &&
 578                             os_memcmp(params->ssids[j].ssid, ssid->ssid,
 579                                       ssid->ssid_len) == 0)
 580                                 break;
 581                 }
 582                 if (j < params->num_ssids)
 583                         continue; /* already in the list */
 584
 585                 if (params->num_ssids + 1 > max_ssids) {
 586                         wpa_printf(MSG_DEBUG,
 587                                    "Over max scan SSIDs for manual request");
 588                         break;
 589                 }
 590
 591                 wpa_printf(MSG_DEBUG, "Scan SSID (manual request): %s",
 592                            wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
 593                 params->ssids[params->num_ssids].ssid = ssid->ssid;
 594                 params->ssids[params->num_ssids].ssid_len = ssid->ssid_len;
 595                 params->num_ssids++;
 596         }
 597
 598         wpa_s->scan_id_count = 0;
 599 }
 600
 601
 602 static void wpa_supplicant_scan(void *eloop_ctx, void *timeout_ctx)
 603 {
 604         struct wpa_supplicant *wpa_s = eloop_ctx;
 605         struct wpa_ssid *ssid;
 606         int ret, p2p_in_progress;
 607         struct wpabuf *extra_ie = NULL;
 608         struct wpa_driver_scan_params params;
 609         struct wpa_driver_scan_params *scan_params;
 610         size_t max_ssids;
 611         enum wpa_states prev_state;
 612
 613         if (wpa_s->pno || wpa_s->pno_sched_pending) {
 614                 wpa_dbg(wpa_s, MSG_DEBUG, "Skip scan - PNO is in progress");
 615                 return;
 616         }
 617
 618         if (wpa_s->wpa_state == WPA_INTERFACE_DISABLED) {
 619                 wpa_dbg(wpa_s, MSG_DEBUG, "Skip scan - interface disabled");
 620                 return;
 621         }
 622
 623         if (wpa_s->disconnected && wpa_s->scan_req == NORMAL_SCAN_REQ) {
 624                 wpa_dbg(wpa_s, MSG_DEBUG, "Disconnected - do not scan");
 625                 wpa_supplicant_set_state(wpa_s, WPA_DISCONNECTED);
 626                 return;
 627         }
 628
 629         if (wpa_s->scanning) {
 630                 /*
 631                  * If we are already in scanning state, we shall reschedule the
 632                  * the incoming scan request.
 633                  */
 634                 wpa_dbg(wpa_s, MSG_DEBUG, "Already scanning - Reschedule the incoming scan req");
 635                 wpa_supplicant_req_scan(wpa_s, 1, 0);
 636                 return;
 637         }
 638
 639         if (!wpa_supplicant_enabled_networks(wpa_s) &&
 640             wpa_s->scan_req == NORMAL_SCAN_REQ) {
 641                 wpa_dbg(wpa_s, MSG_DEBUG, "No enabled networks - do not scan");
 642                 wpa_supplicant_set_state(wpa_s, WPA_INACTIVE);
 643                 return;
 644         }
 645
 646         if (wpa_s->conf->ap_scan != 0 &&
 647             (wpa_s->drv_flags & WPA_DRIVER_FLAGS_WIRED)) {
 648                 wpa_dbg(wpa_s, MSG_DEBUG, "Using wired authentication - "
 649                         "overriding ap_scan configuration");
 650                 wpa_s->conf->ap_scan = 0;
 651                 wpas_notify_ap_scan_changed(wpa_s);
 652         }
 653
 654         if (wpa_s->conf->ap_scan == 0) {
 655                 wpa_supplicant_gen_assoc_event(wpa_s);
 656                 return;
 657         }
 658
 659         p2p_in_progress = wpas_p2p_in_progress(wpa_s);
 660         if (p2p_in_progress && p2p_in_progress != 2) {
 661                 wpa_dbg(wpa_s, MSG_DEBUG, "Delay station mode scan while P2P operation is in progress");
 662                 wpa_supplicant_req_scan(wpa_s, 5, 0);
 663                 return;
 664         }
 665
 666         if (wpa_s->conf->ap_scan == 2)
 667                 max_ssids = 1;
 668         else {
 669                 max_ssids = wpa_s->max_scan_ssids;
 670                 if (max_ssids > WPAS_MAX_SCAN_SSIDS)
 671                         max_ssids = WPAS_MAX_SCAN_SSIDS;
 672         }
 673
 674         wpa_s->last_scan_req = wpa_s->scan_req;
 675         wpa_s->scan_req = NORMAL_SCAN_REQ;
 676
 677         os_memset(&params, 0, sizeof(params));
 678
 679         prev_state = wpa_s->wpa_state;
 680         if (wpa_s->wpa_state == WPA_DISCONNECTED ||
 681             wpa_s->wpa_state == WPA_INACTIVE)
 682                 wpa_supplicant_set_state(wpa_s, WPA_SCANNING);
 683
 684         /*
 685          * If autoscan has set its own scanning parameters
 686          */
 687         if (wpa_s->autoscan_params != NULL) {
 688                 scan_params = wpa_s->autoscan_params;
 689                 goto scan;
 690         }
 691
 692         if (wpa_s->last_scan_req != MANUAL_SCAN_REQ &&
 693             wpa_s->connect_without_scan) {
 694                 for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
 695                         if (ssid == wpa_s->connect_without_scan)
 696                                 break;
 697                 }
 698                 wpa_s->connect_without_scan = NULL;
 699                 if (ssid) {
 700                         wpa_printf(MSG_DEBUG, "Start a pre-selected network "
 701                                    "without scan step");
 702                         wpa_supplicant_associate(wpa_s, NULL, ssid);
 703                         return;
 704                 }
 705         }
 706
 707 #ifdef CONFIG_P2P
 708         if ((wpa_s->p2p_in_provisioning || wpa_s->show_group_started) &&
 709             wpa_s->go_params) {
 710                 wpa_printf(MSG_DEBUG, "P2P: Use specific SSID for scan during P2P group formation (p2p_in_provisioning=%d show_group_started=%d)",
 711                            wpa_s->p2p_in_provisioning,
 712                            wpa_s->show_group_started);
 713                 params.ssids[0].ssid = wpa_s->go_params->ssid;
 714                 params.ssids[0].ssid_len = wpa_s->go_params->ssid_len;
 715                 params.num_ssids = 1;
 716                 goto ssid_list_set;
 717         }
 718
 719         if (wpa_s->p2p_in_invitation) {
 720                 if (wpa_s->current_ssid) {
 721                         wpa_printf(MSG_DEBUG, "P2P: Use specific SSID for scan during invitation");
 722                         params.ssids[0].ssid = wpa_s->current_ssid->ssid;
 723                         params.ssids[0].ssid_len =
 724                                 wpa_s->current_ssid->ssid_len;
 725                         params.num_ssids = 1;
 726                 } else {
 727                         wpa_printf(MSG_DEBUG, "P2P: No specific SSID known for scan during invitation");
 728                 }
 729                 goto ssid_list_set;
 730         }
 731 #endif /* CONFIG_P2P */
 732
 733         /* Find the starting point from which to continue scanning */
 734         ssid = wpa_s->conf->ssid;
 735         if (wpa_s->prev_scan_ssid != WILDCARD_SSID_SCAN) {
 736                 while (ssid) {
 737                         if (ssid == wpa_s->prev_scan_ssid) {
 738                                 ssid = ssid->next;
 739                                 break;
 740                         }
 741                         ssid = ssid->next;
 742                 }
 743         }
 744
 745         if (wpa_s->last_scan_req != MANUAL_SCAN_REQ &&
 746             wpa_s->conf->ap_scan == 2) {
 747                 wpa_s->connect_without_scan = NULL;
 748                 wpa_s->prev_scan_wildcard = 0;
 749                 wpa_supplicant_assoc_try(wpa_s, ssid);
 750                 return;
 751         } else if (wpa_s->conf->ap_scan == 2) {
 752                 /*
 753                  * User-initiated scan request in ap_scan == 2; scan with
 754                  * wildcard SSID.
 755                  */
 756                 ssid = NULL;
 757         } else if (wpa_s->reattach && wpa_s->current_ssid != NULL) {
 758                 /*
 759                  * Perform single-channel single-SSID scan for
 760                  * reassociate-to-same-BSS operation.
 761                  */
 762                 /* Setup SSID */
 763                 ssid = wpa_s->current_ssid;
 764                 wpa_hexdump_ascii(MSG_DEBUG, "Scan SSID",
 765                                   ssid->ssid, ssid->ssid_len);
 766                 params.ssids[0].ssid = ssid->ssid;
 767                 params.ssids[0].ssid_len = ssid->ssid_len;
 768                 params.num_ssids = 1;
 769
 770                 /*
 771                  * Allocate memory for frequency array, allocate one extra
 772                  * slot for the zero-terminator.
 773                  */
 774                 params.freqs = os_malloc(sizeof(int) * 2);
 775                 if (params.freqs == NULL) {
 776                         wpa_dbg(wpa_s, MSG_ERROR, "Memory allocation failed");
 777                         return;
 778                 }
 779                 params.freqs[0] = wpa_s->assoc_freq;
 780                 params.freqs[1] = 0;
 781
 782                 /*
 783                  * Reset the reattach flag so that we fall back to full scan if
 784                  * this scan fails.
 785                  */
 786                 wpa_s->reattach = 0;
 787         } else {
 788                 struct wpa_ssid *start = ssid, *tssid;
 789                 int freqs_set = 0;
 790                 if (ssid == NULL && max_ssids > 1)
 791                         ssid = wpa_s->conf->ssid;
 792                 while (ssid) {
 793                         if (!wpas_network_disabled(wpa_s, ssid) &&
 794                             ssid->scan_ssid) {
 795                                 wpa_hexdump_ascii(MSG_DEBUG, "Scan SSID",
 796                                                   ssid->ssid, ssid->ssid_len);
 797                                 params.ssids[params.num_ssids].ssid =
 798                                         ssid->ssid;
 799                                 params.ssids[params.num_ssids].ssid_len =
 800                                         ssid->ssid_len;
 801                                 params.num_ssids++;
 802                                 if (params.num_ssids + 1 >= max_ssids)
 803                                         break;
 804                         }
 805                         ssid = ssid->next;
 806                         if (ssid == start)
 807                                 break;
 808                         if (ssid == NULL && max_ssids > 1 &&
 809                             start != wpa_s->conf->ssid)
 810                                 ssid = wpa_s->conf->ssid;
 811                 }
 812
 813                 if (wpa_s->scan_id_count &&
 814                     wpa_s->last_scan_req == MANUAL_SCAN_REQ)
 815                         wpa_set_scan_ssids(wpa_s, &params, max_ssids);
 816
 817                 for (tssid = wpa_s->conf->ssid; tssid; tssid = tssid->next) {
 818                         if (wpas_network_disabled(wpa_s, tssid))
 819                                 continue;
 820                         if ((params.freqs || !freqs_set) && tssid->scan_freq) {
 821                                 int_array_concat(&params.freqs,
 822                                                  tssid->scan_freq);
 823                         } else {
 824                                 os_free(params.freqs);
 825                                 params.freqs = NULL;
 826                         }
 827                         freqs_set = 1;
 828                 }
 829                 int_array_sort_unique(params.freqs);
 830         }
 831
 832         if (ssid && max_ssids == 1) {
 833                 /*
 834                  * If the driver is limited to 1 SSID at a time interleave
 835                  * wildcard SSID scans with specific SSID scans to avoid
 836                  * waiting a long time for a wildcard scan.
 837                  */
 838                 if (!wpa_s->prev_scan_wildcard) {
 839                         params.ssids[0].ssid = NULL;
 840                         params.ssids[0].ssid_len = 0;
 841                         wpa_s->prev_scan_wildcard = 1;
 842                         wpa_dbg(wpa_s, MSG_DEBUG, "Starting AP scan for "
 843                                 "wildcard SSID (Interleave with specific)");
 844                 } else {
 845                         wpa_s->prev_scan_ssid = ssid;
 846                         wpa_s->prev_scan_wildcard = 0;
 847                         wpa_dbg(wpa_s, MSG_DEBUG,
 848                                 "Starting AP scan for specific SSID: %s",
 849                                 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
 850                 }
 851         } else if (ssid) {
 852                 /* max_ssids > 1 */
 853
 854                 wpa_s->prev_scan_ssid = ssid;
 855                 wpa_dbg(wpa_s, MSG_DEBUG, "Include wildcard SSID in "
 856                         "the scan request");
 857                 params.num_ssids++;
 858         } else if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
 859                    wpa_s->manual_scan_passive && params.num_ssids == 0) {
 860                 wpa_dbg(wpa_s, MSG_DEBUG, "Use passive scan based on manual request");
 861         } else {
 862                 wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
 863                 params.num_ssids++;
 864                 wpa_dbg(wpa_s, MSG_DEBUG, "Starting AP scan for wildcard "
 865                         "SSID");
 866         }
 867 #ifdef CONFIG_P2P
 868 ssid_list_set:
 869 #endif /* CONFIG_P2P */
 870
 871         wpa_supplicant_optimize_freqs(wpa_s, &params);
 872         extra_ie = wpa_supplicant_extra_ies(wpa_s);
 873
 874         if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
 875             wpa_s->manual_scan_only_new)
 876                 params.only_new_results = 1;
 877
 878         if (wpa_s->last_scan_req == MANUAL_SCAN_REQ && params.freqs == NULL &&
 879             wpa_s->manual_scan_freqs) {
 880                 wpa_dbg(wpa_s, MSG_DEBUG, "Limit manual scan to specified channels");
 881                 params.freqs = wpa_s->manual_scan_freqs;
 882                 wpa_s->manual_scan_freqs = NULL;
 883         }
 884
 885         if (params.freqs == NULL && wpa_s->next_scan_freqs) {
 886                 wpa_dbg(wpa_s, MSG_DEBUG, "Optimize scan based on previously "
 887                         "generated frequency list");
 888                 params.freqs = wpa_s->next_scan_freqs;
 889         } else
 890                 os_free(wpa_s->next_scan_freqs);
 891         wpa_s->next_scan_freqs = NULL;
 892         wpa_setband_scan_freqs(wpa_s, &params);
 893
 894         /* See if user specified frequencies. If so, scan only those. */
 895         if (wpa_s->conf->freq_list && !params.freqs) {
 896                 wpa_dbg(wpa_s, MSG_DEBUG,
 897                         "Optimize scan based on conf->freq_list");
 898                 int_array_concat(&params.freqs, wpa_s->conf->freq_list);
 899         }
 900
 901         /* Use current associated channel? */
 902         if (wpa_s->conf->scan_cur_freq && !params.freqs) {
 903                 unsigned int num = wpa_s->num_multichan_concurrent;
 904
 905                 params.freqs = os_calloc(num + 1, sizeof(int));
 906                 if (params.freqs) {
 907                         num = get_shared_radio_freqs(wpa_s, params.freqs, num);
 908                         if (num > 0) {
 909                                 wpa_dbg(wpa_s, MSG_DEBUG, "Scan only the "
 910                                         "current operating channels since "
 911                                         "scan_cur_freq is enabled");
 912                         } else {
 913                                 os_free(params.freqs);
 914                                 params.freqs = NULL;
 915                         }
 916                 }
 917         }
 918
 919         params.filter_ssids = wpa_supplicant_build_filter_ssids(
 920                 wpa_s->conf, &params.num_filter_ssids);
 921         if (extra_ie) {
 922                 params.extra_ies = wpabuf_head(extra_ie);
 923                 params.extra_ies_len = wpabuf_len(extra_ie);
 924         }
 925
 926 #ifdef CONFIG_P2P
 927         if (wpa_s->p2p_in_provisioning || wpa_s->p2p_in_invitation ||
 928             (wpa_s->show_group_started && wpa_s->go_params)) {
 929                 /*
 930                  * The interface may not yet be in P2P mode, so we have to
 931                  * explicitly request P2P probe to disable CCK rates.
 932                  */
 933                 params.p2p_probe = 1;
 934         }
 935 #endif /* CONFIG_P2P */
 936
 937         scan_params = &params;
 938
 939 scan:
 940 #ifdef CONFIG_P2P
 941         /*
 942          * If the driver does not support multi-channel concurrency and a
 943          * virtual interface that shares the same radio with the wpa_s interface
 944          * is operating there may not be need to scan other channels apart from
 945          * the current operating channel on the other virtual interface. Filter
 946          * out other channels in case we are trying to find a connection for a
 947          * station interface when we are not configured to prefer station
 948          * connection and a concurrent operation is already in process.
 949          */
 950         if (wpa_s->scan_for_connection &&
 951             wpa_s->last_scan_req == NORMAL_SCAN_REQ &&
 952             !scan_params->freqs && !params.freqs &&
 953             wpas_is_p2p_prioritized(wpa_s) &&
 954             wpa_s->p2p_group_interface == NOT_P2P_GROUP_INTERFACE &&
 955             non_p2p_network_enabled(wpa_s)) {
 956                 unsigned int num = wpa_s->num_multichan_concurrent;
 957
 958                 params.freqs = os_calloc(num + 1, sizeof(int));
 959                 if (params.freqs) {
 960                         num = get_shared_radio_freqs(wpa_s, params.freqs, num);
 961                         if (num > 0 && num == wpa_s->num_multichan_concurrent) {
 962                                 wpa_dbg(wpa_s, MSG_DEBUG, "Scan only the current operating channels since all channels are already used");
 963                         } else {
 964                                 os_free(params.freqs);
 965                                 params.freqs = NULL;
 966                         }
 967                 }
 968         }
 969 #endif /* CONFIG_P2P */
 970
 971         ret = wpa_supplicant_trigger_scan(wpa_s, scan_params);
 972
 973         if (ret && wpa_s->last_scan_req == MANUAL_SCAN_REQ && params.freqs &&
 974             !wpa_s->manual_scan_freqs) {
 975                 /* Restore manual_scan_freqs for the next attempt */
 976                 wpa_s->manual_scan_freqs = params.freqs;
 977                 params.freqs = NULL;
 978         }
 979
 980         wpabuf_free(extra_ie);
 981         os_free(params.freqs);
 982         os_free(params.filter_ssids);
 983
 984         if (ret) {
 985                 wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate AP scan");
 986                 if (prev_state != wpa_s->wpa_state)
 987                         wpa_supplicant_set_state(wpa_s, prev_state);
 988                 /* Restore scan_req since we will try to scan again */
 989                 wpa_s->scan_req = wpa_s->last_scan_req;
 990                 wpa_supplicant_req_scan(wpa_s, 1, 0);
 991         } else {
 992                 wpa_s->scan_for_connection = 0;
 993         }
 994 }
 995
 996
 997 void wpa_supplicant_update_scan_int(struct wpa_supplicant *wpa_s, int sec)
 998 {
 999         struct os_reltime remaining, new_int;
1000         int cancelled;
1001
1002         cancelled = eloop_cancel_timeout_one(wpa_supplicant_scan, wpa_s, NULL,
1003                                              &remaining);
1004
1005         new_int.sec = sec;
1006         new_int.usec = 0;
1007         if (cancelled && os_reltime_before(&remaining, &new_int)) {
1008                 new_int.sec = remaining.sec;
1009                 new_int.usec = remaining.usec;
1010         }
1011
1012         if (cancelled) {
1013                 eloop_register_timeout(new_int.sec, new_int.usec,
1014                                        wpa_supplicant_scan, wpa_s, NULL);
1015         }
1016         wpa_s->scan_interval = sec;
1017 }
1018
1019
1020 /**
1021  * wpa_supplicant_req_scan - Schedule a scan for neighboring access points
1022  * @wpa_s: Pointer to wpa_supplicant data
1023  * @sec: Number of seconds after which to scan
1024  * @usec: Number of microseconds after which to scan
1025  *
1026  * This function is used to schedule a scan for neighboring access points after
1027  * the specified time.
1028  */
1029 void wpa_supplicant_req_scan(struct wpa_supplicant *wpa_s, int sec, int usec)
1030 {
1031         int res = eloop_deplete_timeout(sec, usec, wpa_supplicant_scan, wpa_s,
1032                                         NULL);
1033         if (res == 1) {
1034                 wpa_dbg(wpa_s, MSG_DEBUG, "Rescheduling scan request: %d.%06d sec",
1035                         sec, usec);
1036         } else if (res == 0) {
1037                 wpa_dbg(wpa_s, MSG_DEBUG, "Ignore new scan request for %d.%06d sec since an earlier request is scheduled to trigger sooner",
1038                         sec, usec);
1039         } else {
1040                 wpa_dbg(wpa_s, MSG_DEBUG, "Setting scan request: %d.%06d sec",
1041                         sec, usec);
1042                 eloop_register_timeout(sec, usec, wpa_supplicant_scan, wpa_s, NULL);
1043         }
1044 }
1045
1046
1047 /**
1048  * wpa_supplicant_delayed_sched_scan - Request a delayed scheduled scan
1049  * @wpa_s: Pointer to wpa_supplicant data
1050  * @sec: Number of seconds after which to scan
1051  * @usec: Number of microseconds after which to scan
1052  * Returns: 0 on success or -1 otherwise
1053  *
1054  * This function is used to schedule periodic scans for neighboring
1055  * access points after the specified time.
1056  */
1057 int wpa_supplicant_delayed_sched_scan(struct wpa_supplicant *wpa_s,
1058                                       int sec, int usec)
1059 {
1060         if (!wpa_s->sched_scan_supported)
1061                 return -1;
1062
1063         eloop_register_timeout(sec, usec,
1064                                wpa_supplicant_delayed_sched_scan_timeout,
1065                                wpa_s, NULL);
1066
1067         return 0;
1068 }
1069
1070
1071 /**
1072  * wpa_supplicant_req_sched_scan - Start a periodic scheduled scan
1073  * @wpa_s: Pointer to wpa_supplicant data
1074  * Returns: 0 is sched_scan was started or -1 otherwise
1075  *
1076  * This function is used to schedule periodic scans for neighboring
1077  * access points repeating the scan continuously.
1078  */
1079 int wpa_supplicant_req_sched_scan(struct wpa_supplicant *wpa_s)
1080 {
1081         struct wpa_driver_scan_params params;
1082         struct wpa_driver_scan_params *scan_params;
1083         enum wpa_states prev_state;
1084         struct wpa_ssid *ssid = NULL;
1085         struct wpabuf *extra_ie = NULL;
1086         int ret;
1087         unsigned int max_sched_scan_ssids;
1088         int wildcard = 0;
1089         int need_ssids;
1090
1091         if (!wpa_s->sched_scan_supported)
1092                 return -1;
1093
1094         if (wpa_s->max_sched_scan_ssids > WPAS_MAX_SCAN_SSIDS)
1095                 max_sched_scan_ssids = WPAS_MAX_SCAN_SSIDS;
1096         else
1097                 max_sched_scan_ssids = wpa_s->max_sched_scan_ssids;
1098         if (max_sched_scan_ssids < 1 || wpa_s->conf->disable_scan_offload)
1099                 return -1;
1100
1101         if (wpa_s->sched_scanning) {
1102                 wpa_dbg(wpa_s, MSG_DEBUG, "Already sched scanning");
1103                 return 0;
1104         }
1105
1106         need_ssids = 0;
1107         for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
1108                 if (!wpas_network_disabled(wpa_s, ssid) && !ssid->scan_ssid) {
1109                         /* Use wildcard SSID to find this network */
1110                         wildcard = 1;
1111                 } else if (!wpas_network_disabled(wpa_s, ssid) &&
1112                            ssid->ssid_len)
1113                         need_ssids++;
1114
1115 #ifdef CONFIG_WPS
1116                 if (!wpas_network_disabled(wpa_s, ssid) &&
1117                     ssid->key_mgmt == WPA_KEY_MGMT_WPS) {
1118                         /*
1119                          * Normal scan is more reliable and faster for WPS
1120                          * operations and since these are for short periods of
1121                          * time, the benefit of trying to use sched_scan would
1122                          * be limited.
1123                          */
1124                         wpa_dbg(wpa_s, MSG_DEBUG, "Use normal scan instead of "
1125                                 "sched_scan for WPS");
1126                         return -1;
1127                 }
1128 #endif /* CONFIG_WPS */
1129         }
1130         if (wildcard)
1131                 need_ssids++;
1132
1133         if (wpa_s->normal_scans < 3 &&
1134             (need_ssids <= wpa_s->max_scan_ssids ||
1135              wpa_s->max_scan_ssids >= (int) max_sched_scan_ssids)) {
1136                 /*
1137                  * When normal scan can speed up operations, use that for the
1138                  * first operations before starting the sched_scan to allow
1139                  * user space sleep more. We do this only if the normal scan
1140                  * has functionality that is suitable for this or if the
1141                  * sched_scan does not have better support for multiple SSIDs.
1142                  */
1143                 wpa_dbg(wpa_s, MSG_DEBUG, "Use normal scan instead of "
1144                         "sched_scan for initial scans (normal_scans=%d)",
1145                         wpa_s->normal_scans);
1146                 return -1;
1147         }
1148
1149         os_memset(&params, 0, sizeof(params));
1150
1151         /* If we can't allocate space for the filters, we just don't filter */
1152         params.filter_ssids = os_zalloc(wpa_s->max_match_sets *
1153                                         sizeof(struct wpa_driver_scan_filter));
1154
1155         prev_state = wpa_s->wpa_state;
1156         if (wpa_s->wpa_state == WPA_DISCONNECTED ||
1157             wpa_s->wpa_state == WPA_INACTIVE)
1158                 wpa_supplicant_set_state(wpa_s, WPA_SCANNING);
1159
1160         if (wpa_s->autoscan_params != NULL) {
1161                 scan_params = wpa_s->autoscan_params;
1162                 goto scan;
1163         }
1164
1165         /* Find the starting point from which to continue scanning */
1166         ssid = wpa_s->conf->ssid;
1167         if (wpa_s->prev_sched_ssid) {
1168                 while (ssid) {
1169                         if (ssid == wpa_s->prev_sched_ssid) {
1170                                 ssid = ssid->next;
1171                                 break;
1172                         }
1173                         ssid = ssid->next;
1174                 }
1175         }
1176
1177         if (!ssid || !wpa_s->prev_sched_ssid) {
1178                 wpa_dbg(wpa_s, MSG_DEBUG, "Beginning of SSID list");
1179                 if (wpa_s->conf->sched_scan_interval)
1180                         wpa_s->sched_scan_interval =
1181                                 wpa_s->conf->sched_scan_interval;
1182                 if (wpa_s->sched_scan_interval == 0)
1183                         wpa_s->sched_scan_interval = 10;
1184                 wpa_s->sched_scan_timeout = max_sched_scan_ssids * 2;
1185                 wpa_s->first_sched_scan = 1;
1186                 ssid = wpa_s->conf->ssid;
1187                 wpa_s->prev_sched_ssid = ssid;
1188         }
1189
1190         if (wildcard) {
1191                 wpa_dbg(wpa_s, MSG_DEBUG, "Add wildcard SSID to sched_scan");
1192                 params.num_ssids++;
1193         }
1194
1195         while (ssid) {
1196                 if (wpas_network_disabled(wpa_s, ssid))
1197                         goto next;
1198
1199                 if (params.num_filter_ssids < wpa_s->max_match_sets &&
1200                     params.filter_ssids && ssid->ssid && ssid->ssid_len) {
1201                         wpa_dbg(wpa_s, MSG_DEBUG, "add to filter ssid: %s",
1202                                 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
1203                         os_memcpy(params.filter_ssids[params.num_filter_ssids].ssid,
1204                                   ssid->ssid, ssid->ssid_len);
1205                         params.filter_ssids[params.num_filter_ssids].ssid_len =
1206                                 ssid->ssid_len;
1207                         params.num_filter_ssids++;
1208                 } else if (params.filter_ssids && ssid->ssid && ssid->ssid_len)
1209                 {
1210                         wpa_dbg(wpa_s, MSG_DEBUG, "Not enough room for SSID "
1211                                 "filter for sched_scan - drop filter");
1212                         os_free(params.filter_ssids);
1213                         params.filter_ssids = NULL;
1214                         params.num_filter_ssids = 0;
1215                 }
1216
1217                 if (ssid->scan_ssid && ssid->ssid && ssid->ssid_len) {
1218                         if (params.num_ssids == max_sched_scan_ssids)
1219                                 break; /* only room for broadcast SSID */
1220                         wpa_dbg(wpa_s, MSG_DEBUG,
1221                                 "add to active scan ssid: %s",
1222                                 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
1223                         params.ssids[params.num_ssids].ssid =
1224                                 ssid->ssid;
1225                         params.ssids[params.num_ssids].ssid_len =
1226                                 ssid->ssid_len;
1227                         params.num_ssids++;
1228                         if (params.num_ssids >= max_sched_scan_ssids) {
1229                                 wpa_s->prev_sched_ssid = ssid;
1230                                 do {
1231                                         ssid = ssid->next;
1232                                 } while (ssid &&
1233                                          (wpas_network_disabled(wpa_s, ssid) ||
1234                                           !ssid->scan_ssid));
1235                                 break;
1236                         }
1237                 }
1238
1239         next:
1240                 wpa_s->prev_sched_ssid = ssid;
1241                 ssid = ssid->next;
1242         }
1243
1244         if (params.num_filter_ssids == 0) {
1245                 os_free(params.filter_ssids);
1246                 params.filter_ssids = NULL;
1247         }
1248
1249         extra_ie = wpa_supplicant_extra_ies(wpa_s);
1250         if (extra_ie) {
1251                 params.extra_ies = wpabuf_head(extra_ie);
1252                 params.extra_ies_len = wpabuf_len(extra_ie);
1253         }
1254
1255         if (wpa_s->conf->filter_rssi)
1256                 params.filter_rssi = wpa_s->conf->filter_rssi;
1257
1258         /* See if user specified frequencies. If so, scan only those. */
1259         if (wpa_s->conf->freq_list && !params.freqs) {
1260                 wpa_dbg(wpa_s, MSG_DEBUG,
1261                         "Optimize scan based on conf->freq_list");
1262                 int_array_concat(&params.freqs, wpa_s->conf->freq_list);
1263         }
1264
1265         scan_params = &params;
1266
1267 scan:
1268         if (ssid || !wpa_s->first_sched_scan) {
1269                 wpa_dbg(wpa_s, MSG_DEBUG,
1270                         "Starting sched scan: interval %d timeout %d",
1271                         wpa_s->sched_scan_interval, wpa_s->sched_scan_timeout);
1272         } else {
1273                 wpa_dbg(wpa_s, MSG_DEBUG,
1274                         "Starting sched scan: interval %d (no timeout)",
1275                         wpa_s->sched_scan_interval);
1276         }
1277
1278         wpa_setband_scan_freqs(wpa_s, scan_params);
1279
1280         ret = wpa_supplicant_start_sched_scan(wpa_s, scan_params,
1281                                               wpa_s->sched_scan_interval);
1282         wpabuf_free(extra_ie);
1283         os_free(params.filter_ssids);
1284         if (ret) {
1285                 wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate sched scan");
1286                 if (prev_state != wpa_s->wpa_state)
1287                         wpa_supplicant_set_state(wpa_s, prev_state);
1288                 return ret;
1289         }
1290
1291         /* If we have more SSIDs to scan, add a timeout so we scan them too */
1292         if (ssid || !wpa_s->first_sched_scan) {
1293                 wpa_s->sched_scan_timed_out = 0;
1294                 eloop_register_timeout(wpa_s->sched_scan_timeout, 0,
1295                                        wpa_supplicant_sched_scan_timeout,
1296                                        wpa_s, NULL);
1297                 wpa_s->first_sched_scan = 0;
1298                 wpa_s->sched_scan_timeout /= 2;
1299                 wpa_s->sched_scan_interval *= 2;
1300                 if (wpa_s->sched_scan_timeout < wpa_s->sched_scan_interval) {
1301                         wpa_s->sched_scan_interval = 10;
1302                         wpa_s->sched_scan_timeout = max_sched_scan_ssids * 2;
1303                 }
1304         }
1305
1306         /* If there is no more ssids, start next time from the beginning */
1307         if (!ssid)
1308                 wpa_s->prev_sched_ssid = NULL;
1309
1310         return 0;
1311 }
1312
1313
1314 /**
1315  * wpa_supplicant_cancel_scan - Cancel a scheduled scan request
1316  * @wpa_s: Pointer to wpa_supplicant data
1317  *
1318  * This function is used to cancel a scan request scheduled with
1319  * wpa_supplicant_req_scan().
1320  */
1321 void wpa_supplicant_cancel_scan(struct wpa_supplicant *wpa_s)
1322 {
1323         wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling scan request");
1324         eloop_cancel_timeout(wpa_supplicant_scan, wpa_s, NULL);
1325 }
1326
1327
1328 /**
1329  * wpa_supplicant_cancel_delayed_sched_scan - Stop a delayed scheduled scan
1330  * @wpa_s: Pointer to wpa_supplicant data
1331  *
1332  * This function is used to stop a delayed scheduled scan.
1333  */
1334 void wpa_supplicant_cancel_delayed_sched_scan(struct wpa_supplicant *wpa_s)
1335 {
1336         if (!wpa_s->sched_scan_supported)
1337                 return;
1338
1339         wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling delayed sched scan");
1340         eloop_cancel_timeout(wpa_supplicant_delayed_sched_scan_timeout,
1341                              wpa_s, NULL);
1342 }
1343
1344
1345 /**
1346  * wpa_supplicant_cancel_sched_scan - Stop running scheduled scans
1347  * @wpa_s: Pointer to wpa_supplicant data
1348  *
1349  * This function is used to stop a periodic scheduled scan.
1350  */
1351 void wpa_supplicant_cancel_sched_scan(struct wpa_supplicant *wpa_s)
1352 {
1353         if (!wpa_s->sched_scanning)
1354                 return;
1355
1356         wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling sched scan");
1357         eloop_cancel_timeout(wpa_supplicant_sched_scan_timeout, wpa_s, NULL);
1358         wpa_supplicant_stop_sched_scan(wpa_s);
1359 }
1360
1361
1362 /**
1363  * wpa_supplicant_notify_scanning - Indicate possible scan state change
1364  * @wpa_s: Pointer to wpa_supplicant data
1365  * @scanning: Whether scanning is currently in progress
1366  *
1367  * This function is to generate scanning notifycations. It is called whenever
1368  * there may have been a change in scanning (scan started, completed, stopped).
1369  * wpas_notify_scanning() is called whenever the scanning state changed from the
1370  * previously notified state.
1371  */
1372 void wpa_supplicant_notify_scanning(struct wpa_supplicant *wpa_s,
1373                                     int scanning)
1374 {
1375         if (wpa_s->scanning != scanning) {
1376                 wpa_s->scanning = scanning;
1377                 wpas_notify_scanning(wpa_s);
1378         }
1379 }
1380
1381
1382 static int wpa_scan_get_max_rate(const struct wpa_scan_res *res)
1383 {
1384         int rate = 0;
1385         const u8 *ie;
1386         int i;
1387
1388         ie = wpa_scan_get_ie(res, WLAN_EID_SUPP_RATES);
1389         for (i = 0; ie && i < ie[1]; i++) {
1390                 if ((ie[i + 2] & 0x7f) > rate)
1391                         rate = ie[i + 2] & 0x7f;
1392         }
1393
1394         ie = wpa_scan_get_ie(res, WLAN_EID_EXT_SUPP_RATES);
1395         for (i = 0; ie && i < ie[1]; i++) {
1396                 if ((ie[i + 2] & 0x7f) > rate)
1397                         rate = ie[i + 2] & 0x7f;
1398         }
1399
1400         return rate;
1401 }
1402
1403
1404 /**
1405  * wpa_scan_get_ie - Fetch a specified information element from a scan result
1406  * @res: Scan result entry
1407  * @ie: Information element identitifier (WLAN_EID_*)
1408  * Returns: Pointer to the information element (id field) or %NULL if not found
1409  *
1410  * This function returns the first matching information element in the scan
1411  * result.
1412  */
1413 const u8 * wpa_scan_get_ie(const struct wpa_scan_res *res, u8 ie)
1414 {
1415         const u8 *end, *pos;
1416
1417         pos = (const u8 *) (res + 1);
1418         end = pos + res->ie_len;
1419
1420         while (pos + 1 < end) {
1421                 if (pos + 2 + pos[1] > end)
1422                         break;
1423                 if (pos[0] == ie)
1424                         return pos;
1425                 pos += 2 + pos[1];
1426         }
1427
1428         return NULL;
1429 }
1430
1431
1432 /**
1433  * wpa_scan_get_vendor_ie - Fetch vendor information element from a scan result
1434  * @res: Scan result entry
1435  * @vendor_type: Vendor type (four octets starting the IE payload)
1436  * Returns: Pointer to the information element (id field) or %NULL if not found
1437  *
1438  * This function returns the first matching information element in the scan
1439  * result.
1440  */
1441 const u8 * wpa_scan_get_vendor_ie(const struct wpa_scan_res *res,
1442                                   u32 vendor_type)
1443 {
1444         const u8 *end, *pos;
1445
1446         pos = (const u8 *) (res + 1);
1447         end = pos + res->ie_len;
1448
1449         while (pos + 1 < end) {
1450                 if (pos + 2 + pos[1] > end)
1451                         break;
1452                 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1453                     vendor_type == WPA_GET_BE32(&pos[2]))
1454                         return pos;
1455                 pos += 2 + pos[1];
1456         }
1457
1458         return NULL;
1459 }
1460
1461
1462 /**
1463  * wpa_scan_get_vendor_ie_beacon - Fetch vendor information from a scan result
1464  * @res: Scan result entry
1465  * @vendor_type: Vendor type (four octets starting the IE payload)
1466  * Returns: Pointer to the information element (id field) or %NULL if not found
1467  *
1468  * This function returns the first matching information element in the scan
1469  * result.
1470  *
1471  * This function is like wpa_scan_get_vendor_ie(), but uses IE buffer only
1472  * from Beacon frames instead of either Beacon or Probe Response frames.
1473  */
1474 const u8 * wpa_scan_get_vendor_ie_beacon(const struct wpa_scan_res *res,
1475                                          u32 vendor_type)
1476 {
1477         const u8 *end, *pos;
1478
1479         if (res->beacon_ie_len == 0)
1480                 return NULL;
1481
1482         pos = (const u8 *) (res + 1);
1483         pos += res->ie_len;
1484         end = pos + res->beacon_ie_len;
1485
1486         while (pos + 1 < end) {
1487                 if (pos + 2 + pos[1] > end)
1488                         break;
1489                 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1490                     vendor_type == WPA_GET_BE32(&pos[2]))
1491                         return pos;
1492                 pos += 2 + pos[1];
1493         }
1494
1495         return NULL;
1496 }
1497
1498
1499 /**
1500  * wpa_scan_get_vendor_ie_multi - Fetch vendor IE data from a scan result
1501  * @res: Scan result entry
1502  * @vendor_type: Vendor type (four octets starting the IE payload)
1503  * Returns: Pointer to the information element payload or %NULL if not found
1504  *
1505  * This function returns concatenated payload of possibly fragmented vendor
1506  * specific information elements in the scan result. The caller is responsible
1507  * for freeing the returned buffer.
1508  */
1509 struct wpabuf * wpa_scan_get_vendor_ie_multi(const struct wpa_scan_res *res,
1510                                              u32 vendor_type)
1511 {
1512         struct wpabuf *buf;
1513         const u8 *end, *pos;
1514
1515         buf = wpabuf_alloc(res->ie_len);
1516         if (buf == NULL)
1517                 return NULL;
1518
1519         pos = (const u8 *) (res + 1);
1520         end = pos + res->ie_len;
1521
1522         while (pos + 1 < end) {
1523                 if (pos + 2 + pos[1] > end)
1524                         break;
1525                 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1526                     vendor_type == WPA_GET_BE32(&pos[2]))
1527                         wpabuf_put_data(buf, pos + 2 + 4, pos[1] - 4);
1528                 pos += 2 + pos[1];
1529         }
1530
1531         if (wpabuf_len(buf) == 0) {
1532                 wpabuf_free(buf);
1533                 buf = NULL;
1534         }
1535
1536         return buf;
1537 }
1538
1539
1540 /*
1541  * Channels with a great SNR can operate at full rate. What is a great SNR?
1542  * This doc https://supportforums.cisco.com/docs/DOC-12954 says, "the general
1543  * rule of thumb is that any SNR above 20 is good." This one
1544  * http://www.cisco.com/en/US/tech/tk722/tk809/technologies_q_and_a_item09186a00805e9a96.shtml#qa23
1545  * recommends 25 as a minimum SNR for 54 Mbps data rate. 30 is chosen here as a
1546  * conservative value.
1547  */
1548 #define GREAT_SNR 30
1549
1550 /* Compare function for sorting scan results. Return >0 if @b is considered
1551  * better. */
1552 static int wpa_scan_result_compar(const void *a, const void *b)
1553 {
1554 #define IS_5GHZ(n) (n > 4000)
1555 #define MIN(a,b) a < b ? a : b
1556         struct wpa_scan_res **_wa = (void *) a;
1557         struct wpa_scan_res **_wb = (void *) b;
1558         struct wpa_scan_res *wa = *_wa;
1559         struct wpa_scan_res *wb = *_wb;
1560         int wpa_a, wpa_b, maxrate_a, maxrate_b;
1561         int snr_a, snr_b;
1562
1563         /* WPA/WPA2 support preferred */
1564         wpa_a = wpa_scan_get_vendor_ie(wa, WPA_IE_VENDOR_TYPE) != NULL ||
1565                 wpa_scan_get_ie(wa, WLAN_EID_RSN) != NULL;
1566         wpa_b = wpa_scan_get_vendor_ie(wb, WPA_IE_VENDOR_TYPE) != NULL ||
1567                 wpa_scan_get_ie(wb, WLAN_EID_RSN) != NULL;
1568
1569         if (wpa_b && !wpa_a)
1570                 return 1;
1571         if (!wpa_b && wpa_a)
1572                 return -1;
1573
1574         /* privacy support preferred */
1575         if ((wa->caps & IEEE80211_CAP_PRIVACY) == 0 &&
1576             (wb->caps & IEEE80211_CAP_PRIVACY))
1577                 return 1;
1578         if ((wa->caps & IEEE80211_CAP_PRIVACY) &&
1579             (wb->caps & IEEE80211_CAP_PRIVACY) == 0)
1580                 return -1;
1581
1582         if ((wa->flags & wb->flags & WPA_SCAN_LEVEL_DBM) &&
1583             !((wa->flags | wb->flags) & WPA_SCAN_NOISE_INVALID)) {
1584                 snr_a = MIN(wa->level - wa->noise, GREAT_SNR);
1585                 snr_b = MIN(wb->level - wb->noise, GREAT_SNR);
1586         } else {
1587                 /* Not suitable information to calculate SNR, so use level */
1588                 snr_a = wa->level;
1589                 snr_b = wb->level;
1590         }
1591
1592         /* best/max rate preferred if SNR close enough */
1593         if ((snr_a && snr_b && abs(snr_b - snr_a) < 5) ||
1594             (wa->qual && wb->qual && abs(wb->qual - wa->qual) < 10)) {
1595                 maxrate_a = wpa_scan_get_max_rate(wa);
1596                 maxrate_b = wpa_scan_get_max_rate(wb);
1597                 if (maxrate_a != maxrate_b)
1598                         return maxrate_b - maxrate_a;
1599                 if (IS_5GHZ(wa->freq) ^ IS_5GHZ(wb->freq))
1600                         return IS_5GHZ(wa->freq) ? -1 : 1;
1601         }
1602
1603         /* use freq for channel preference */
1604
1605         /* all things being equal, use SNR; if SNRs are
1606          * identical, use quality values since some drivers may only report
1607          * that value and leave the signal level zero */
1608         if (snr_b == snr_a)
1609                 return wb->qual - wa->qual;
1610         return snr_b - snr_a;
1611 #undef MIN
1612 #undef IS_5GHZ
1613 }
1614
1615
1616 #ifdef CONFIG_WPS
1617 /* Compare function for sorting scan results when searching a WPS AP for
1618  * provisioning. Return >0 if @b is considered better. */
1619 static int wpa_scan_result_wps_compar(const void *a, const void *b)
1620 {
1621         struct wpa_scan_res **_wa = (void *) a;
1622         struct wpa_scan_res **_wb = (void *) b;
1623         struct wpa_scan_res *wa = *_wa;
1624         struct wpa_scan_res *wb = *_wb;
1625         int uses_wps_a, uses_wps_b;
1626         struct wpabuf *wps_a, *wps_b;
1627         int res;
1628
1629         /* Optimization - check WPS IE existence before allocated memory and
1630          * doing full reassembly. */
1631         uses_wps_a = wpa_scan_get_vendor_ie(wa, WPS_IE_VENDOR_TYPE) != NULL;
1632         uses_wps_b = wpa_scan_get_vendor_ie(wb, WPS_IE_VENDOR_TYPE) != NULL;
1633         if (uses_wps_a && !uses_wps_b)
1634                 return -1;
1635         if (!uses_wps_a && uses_wps_b)
1636                 return 1;
1637
1638         if (uses_wps_a && uses_wps_b) {
1639                 wps_a = wpa_scan_get_vendor_ie_multi(wa, WPS_IE_VENDOR_TYPE);
1640                 wps_b = wpa_scan_get_vendor_ie_multi(wb, WPS_IE_VENDOR_TYPE);
1641                 res = wps_ap_priority_compar(wps_a, wps_b);
1642                 wpabuf_free(wps_a);
1643                 wpabuf_free(wps_b);
1644                 if (res)
1645                         return res;
1646         }
1647
1648         /*
1649          * Do not use current AP security policy as a sorting criteria during
1650          * WPS provisioning step since the AP may get reconfigured at the
1651          * completion of provisioning.
1652          */
1653
1654         /* all things being equal, use signal level; if signal levels are
1655          * identical, use quality values since some drivers may only report
1656          * that value and leave the signal level zero */
1657         if (wb->level == wa->level)
1658                 return wb->qual - wa->qual;
1659         return wb->level - wa->level;
1660 }
1661 #endif /* CONFIG_WPS */
1662
1663
1664 static void dump_scan_res(struct wpa_scan_results *scan_res)
1665 {
1666 #ifndef CONFIG_NO_STDOUT_DEBUG
1667         size_t i;
1668
1669         if (scan_res->res == NULL || scan_res->num == 0)
1670                 return;
1671
1672         wpa_printf(MSG_EXCESSIVE, "Sorted scan results");
1673
1674         for (i = 0; i < scan_res->num; i++) {
1675                 struct wpa_scan_res *r = scan_res->res[i];
1676                 u8 *pos;
1677                 if ((r->flags & (WPA_SCAN_LEVEL_DBM | WPA_SCAN_NOISE_INVALID))
1678                     == WPA_SCAN_LEVEL_DBM) {
1679                         int snr = r->level - r->noise;
1680                         wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d "
1681                                    "noise=%d level=%d snr=%d%s flags=0x%x "
1682                                    "age=%u",
1683                                    MAC2STR(r->bssid), r->freq, r->qual,
1684                                    r->noise, r->level, snr,
1685                                    snr >= GREAT_SNR ? "*" : "", r->flags,
1686                                    r->age);
1687                 } else {
1688                         wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d "
1689                                    "noise=%d level=%d flags=0x%x age=%u",
1690                                    MAC2STR(r->bssid), r->freq, r->qual,
1691                                    r->noise, r->level, r->flags, r->age);
1692                 }
1693                 pos = (u8 *) (r + 1);
1694                 if (r->ie_len)
1695                         wpa_hexdump(MSG_EXCESSIVE, "IEs", pos, r->ie_len);
1696                 pos += r->ie_len;
1697                 if (r->beacon_ie_len)
1698                         wpa_hexdump(MSG_EXCESSIVE, "Beacon IEs",
1699                                     pos, r->beacon_ie_len);
1700         }
1701 #endif /* CONFIG_NO_STDOUT_DEBUG */
1702 }
1703
1704
1705 /**
1706  * wpa_supplicant_filter_bssid_match - Is the specified BSSID allowed
1707  * @wpa_s: Pointer to wpa_supplicant data
1708  * @bssid: BSSID to check
1709  * Returns: 0 if the BSSID is filtered or 1 if not
1710  *
1711  * This function is used to filter out specific BSSIDs from scan reslts mainly
1712  * for testing purposes (SET bssid_filter ctrl_iface command).
1713  */
1714 int wpa_supplicant_filter_bssid_match(struct wpa_supplicant *wpa_s,
1715                                       const u8 *bssid)
1716 {
1717         size_t i;
1718
1719         if (wpa_s->bssid_filter == NULL)
1720                 return 1;
1721
1722         for (i = 0; i < wpa_s->bssid_filter_count; i++) {
1723                 if (os_memcmp(wpa_s->bssid_filter + i * ETH_ALEN, bssid,
1724                               ETH_ALEN) == 0)
1725                         return 1;
1726         }
1727
1728         return 0;
1729 }
1730
1731
1732 static void filter_scan_res(struct wpa_supplicant *wpa_s,
1733                             struct wpa_scan_results *res)
1734 {
1735         size_t i, j;
1736
1737         if (wpa_s->bssid_filter == NULL)
1738                 return;
1739
1740         for (i = 0, j = 0; i < res->num; i++) {
1741                 if (wpa_supplicant_filter_bssid_match(wpa_s,
1742                                                       res->res[i]->bssid)) {
1743                         res->res[j++] = res->res[i];
1744                 } else {
1745                         os_free(res->res[i]);
1746                         res->res[i] = NULL;
1747                 }
1748         }
1749
1750         if (res->num != j) {
1751                 wpa_printf(MSG_DEBUG, "Filtered out %d scan results",
1752                            (int) (res->num - j));
1753                 res->num = j;
1754         }
1755 }
1756
1757
1758 /**
1759  * wpa_supplicant_get_scan_results - Get scan results
1760  * @wpa_s: Pointer to wpa_supplicant data
1761  * @info: Information about what was scanned or %NULL if not available
1762  * @new_scan: Whether a new scan was performed
1763  * Returns: Scan results, %NULL on failure
1764  *
1765  * This function request the current scan results from the driver and updates
1766  * the local BSS list wpa_s->bss. The caller is responsible for freeing the
1767  * results with wpa_scan_results_free().
1768  */
1769 struct wpa_scan_results *
1770 wpa_supplicant_get_scan_results(struct wpa_supplicant *wpa_s,
1771                                 struct scan_info *info, int new_scan)
1772 {
1773         struct wpa_scan_results *scan_res;
1774         size_t i;
1775         int (*compar)(const void *, const void *) = wpa_scan_result_compar;
1776
1777         scan_res = wpa_drv_get_scan_results2(wpa_s);
1778         if (scan_res == NULL) {
1779                 wpa_dbg(wpa_s, MSG_DEBUG, "Failed to get scan results");
1780                 return NULL;
1781         }
1782         if (scan_res->fetch_time.sec == 0) {
1783                 /*
1784                  * Make sure we have a valid timestamp if the driver wrapper
1785                  * does not set this.
1786                  */
1787                 os_get_reltime(&scan_res->fetch_time);
1788         }
1789         filter_scan_res(wpa_s, scan_res);
1790
1791 #ifdef CONFIG_WPS
1792         if (wpas_wps_searching(wpa_s)) {
1793                 wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Order scan results with WPS "
1794                         "provisioning rules");
1795                 compar = wpa_scan_result_wps_compar;
1796         }
1797 #endif /* CONFIG_WPS */
1798
1799         qsort(scan_res->res, scan_res->num, sizeof(struct wpa_scan_res *),
1800               compar);
1801         dump_scan_res(scan_res);
1802
1803         wpa_bss_update_start(wpa_s);
1804         for (i = 0; i < scan_res->num; i++)
1805                 wpa_bss_update_scan_res(wpa_s, scan_res->res[i],
1806                                         &scan_res->fetch_time);
1807         wpa_bss_update_end(wpa_s, info, new_scan);
1808
1809         return scan_res;
1810 }
1811
1812
1813 /**
1814  * wpa_supplicant_update_scan_results - Update scan results from the driver
1815  * @wpa_s: Pointer to wpa_supplicant data
1816  * Returns: 0 on success, -1 on failure
1817  *
1818  * This function updates the BSS table within wpa_supplicant based on the
1819  * currently available scan results from the driver without requesting a new
1820  * scan. This is used in cases where the driver indicates an association
1821  * (including roaming within ESS) and wpa_supplicant does not yet have the
1822  * needed information to complete the connection (e.g., to perform validation
1823  * steps in 4-way handshake).
1824  */
1825 int wpa_supplicant_update_scan_results(struct wpa_supplicant *wpa_s)
1826 {
1827         struct wpa_scan_results *scan_res;
1828         scan_res = wpa_supplicant_get_scan_results(wpa_s, NULL, 0);
1829         if (scan_res == NULL)
1830                 return -1;
1831         wpa_scan_results_free(scan_res);
1832
1833         return 0;
1834 }
1835
1836
1837 /**
1838  * scan_only_handler - Reports scan results
1839  */
1840 void scan_only_handler(struct wpa_supplicant *wpa_s,
1841                        struct wpa_scan_results *scan_res)
1842 {
1843         wpa_dbg(wpa_s, MSG_DEBUG, "Scan-only results received");
1844         if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
1845             wpa_s->manual_scan_use_id && wpa_s->own_scan_running) {
1846                 wpa_msg_ctrl(wpa_s, MSG_INFO, WPA_EVENT_SCAN_RESULTS "id=%u",
1847                              wpa_s->manual_scan_id);
1848                 wpa_s->manual_scan_use_id = 0;
1849         } else {
1850                 wpa_msg_ctrl(wpa_s, MSG_INFO, WPA_EVENT_SCAN_RESULTS);
1851         }
1852         wpas_notify_scan_results(wpa_s);
1853         wpas_notify_scan_done(wpa_s, 1);
1854         if (wpa_s->scan_work) {
1855                 struct wpa_radio_work *work = wpa_s->scan_work;
1856                 wpa_s->scan_work = NULL;
1857                 radio_work_done(work);
1858         }
1859 }
1860
1861
1862 int wpas_scan_scheduled(struct wpa_supplicant *wpa_s)
1863 {
1864         return eloop_is_timeout_registered(wpa_supplicant_scan, wpa_s, NULL);
1865 }
1866
1867
1868 struct wpa_driver_scan_params *
1869 wpa_scan_clone_params(const struct wpa_driver_scan_params *src)
1870 {
1871         struct wpa_driver_scan_params *params;
1872         size_t i;
1873         u8 *n;
1874
1875         params = os_zalloc(sizeof(*params));
1876         if (params == NULL)
1877                 return NULL;
1878
1879         for (i = 0; i < src->num_ssids; i++) {
1880                 if (src->ssids[i].ssid) {
1881                         n = os_malloc(src->ssids[i].ssid_len);
1882                         if (n == NULL)
1883                                 goto failed;
1884                         os_memcpy(n, src->ssids[i].ssid,
1885                                   src->ssids[i].ssid_len);
1886                         params->ssids[i].ssid = n;
1887                         params->ssids[i].ssid_len = src->ssids[i].ssid_len;
1888                 }
1889         }
1890         params->num_ssids = src->num_ssids;
1891
1892         if (src->extra_ies) {
1893                 n = os_malloc(src->extra_ies_len);
1894                 if (n == NULL)
1895                         goto failed;
1896                 os_memcpy(n, src->extra_ies, src->extra_ies_len);
1897                 params->extra_ies = n;
1898                 params->extra_ies_len = src->extra_ies_len;
1899         }
1900
1901         if (src->freqs) {
1902                 int len = int_array_len(src->freqs);
1903                 params->freqs = os_malloc((len + 1) * sizeof(int));
1904                 if (params->freqs == NULL)
1905                         goto failed;
1906                 os_memcpy(params->freqs, src->freqs, (len + 1) * sizeof(int));
1907         }
1908
1909         if (src->filter_ssids) {
1910                 params->filter_ssids = os_malloc(sizeof(*params->filter_ssids) *
1911                                                  src->num_filter_ssids);
1912                 if (params->filter_ssids == NULL)
1913                         goto failed;
1914                 os_memcpy(params->filter_ssids, src->filter_ssids,
1915                           sizeof(*params->filter_ssids) *
1916                           src->num_filter_ssids);
1917                 params->num_filter_ssids = src->num_filter_ssids;
1918         }
1919
1920         params->filter_rssi = src->filter_rssi;
1921         params->p2p_probe = src->p2p_probe;
1922         params->only_new_results = src->only_new_results;
1923         params->low_priority = src->low_priority;
1924
1925         return params;
1926
1927 failed:
1928         wpa_scan_free_params(params);
1929         return NULL;
1930 }
1931
1932
1933 void wpa_scan_free_params(struct wpa_driver_scan_params *params)
1934 {
1935         size_t i;
1936
1937         if (params == NULL)
1938                 return;
1939
1940         for (i = 0; i < params->num_ssids; i++)
1941                 os_free((u8 *) params->ssids[i].ssid);
1942         os_free((u8 *) params->extra_ies);
1943         os_free(params->freqs);
1944         os_free(params->filter_ssids);
1945         os_free(params);
1946 }
1947
1948
1949 int wpas_start_pno(struct wpa_supplicant *wpa_s)
1950 {
1951         int ret, interval;
1952         size_t i, num_ssid, num_match_ssid;
1953         struct wpa_ssid *ssid;
1954         struct wpa_driver_scan_params params;
1955
1956         if (!wpa_s->sched_scan_supported)
1957                 return -1;
1958
1959         if (wpa_s->pno || wpa_s->pno_sched_pending)
1960                 return 0;
1961
1962         if ((wpa_s->wpa_state > WPA_SCANNING) &&
1963             (wpa_s->wpa_state <= WPA_COMPLETED)) {
1964                 wpa_printf(MSG_ERROR, "PNO: In assoc process");
1965                 return -EAGAIN;
1966         }
1967
1968         if (wpa_s->wpa_state == WPA_SCANNING) {
1969                 wpa_supplicant_cancel_scan(wpa_s);
1970                 if (wpa_s->sched_scanning) {
1971                         wpa_printf(MSG_DEBUG, "Schedule PNO on completion of "
1972                                    "ongoing sched scan");
1973                         wpa_supplicant_cancel_sched_scan(wpa_s);
1974                         wpa_s->pno_sched_pending = 1;
1975                         return 0;
1976                 }
1977         }
1978
1979         os_memset(&params, 0, sizeof(params));
1980
1981         num_ssid = num_match_ssid = 0;
1982         ssid = wpa_s->conf->ssid;
1983         while (ssid) {
1984                 if (!wpas_network_disabled(wpa_s, ssid)) {
1985                         num_match_ssid++;
1986                         if (ssid->scan_ssid)
1987                                 num_ssid++;
1988                 }
1989                 ssid = ssid->next;
1990         }
1991
1992         if (num_match_ssid == 0) {
1993                 wpa_printf(MSG_DEBUG, "PNO: No configured SSIDs");
1994                 return -1;
1995         }
1996
1997         if (num_match_ssid > num_ssid) {
1998                 params.num_ssids++; /* wildcard */
1999                 num_ssid++;
2000         }
2001
2002         if (num_ssid > WPAS_MAX_SCAN_SSIDS) {
2003                 wpa_printf(MSG_DEBUG, "PNO: Use only the first %u SSIDs from "
2004                            "%u", WPAS_MAX_SCAN_SSIDS, (unsigned int) num_ssid);
2005                 num_ssid = WPAS_MAX_SCAN_SSIDS;
2006         }
2007
2008         if (num_match_ssid > wpa_s->max_match_sets) {
2009                 num_match_ssid = wpa_s->max_match_sets;
2010                 wpa_dbg(wpa_s, MSG_DEBUG, "PNO: Too many SSIDs to match");
2011         }
2012         params.filter_ssids = os_calloc(num_match_ssid,
2013                                         sizeof(struct wpa_driver_scan_filter));
2014         if (params.filter_ssids == NULL)
2015                 return -1;
2016         i = 0;
2017         ssid = wpa_s->conf->ssid;
2018         while (ssid) {
2019                 if (!wpas_network_disabled(wpa_s, ssid)) {
2020                         if (ssid->scan_ssid && params.num_ssids < num_ssid) {
2021                                 params.ssids[params.num_ssids].ssid =
2022                                         ssid->ssid;
2023                                 params.ssids[params.num_ssids].ssid_len =
2024                                          ssid->ssid_len;
2025                                 params.num_ssids++;
2026                         }
2027                         os_memcpy(params.filter_ssids[i].ssid, ssid->ssid,
2028                                   ssid->ssid_len);
2029                         params.filter_ssids[i].ssid_len = ssid->ssid_len;
2030                         params.num_filter_ssids++;
2031                         i++;
2032                         if (i == num_match_ssid)
2033                                 break;
2034                 }
2035                 ssid = ssid->next;
2036         }
2037
2038         if (wpa_s->conf->filter_rssi)
2039                 params.filter_rssi = wpa_s->conf->filter_rssi;
2040
2041         interval = wpa_s->conf->sched_scan_interval ?
2042                 wpa_s->conf->sched_scan_interval : 10;
2043
2044         if (params.freqs == NULL && wpa_s->manual_sched_scan_freqs) {
2045                 wpa_dbg(wpa_s, MSG_DEBUG, "Limit sched scan to specified channels");
2046                 params.freqs = wpa_s->manual_sched_scan_freqs;
2047         }
2048
2049         ret = wpa_supplicant_start_sched_scan(wpa_s, &params, interval);
2050         os_free(params.filter_ssids);
2051         if (ret == 0)
2052                 wpa_s->pno = 1;
2053         else
2054                 wpa_msg(wpa_s, MSG_ERROR, "Failed to schedule PNO");
2055         return ret;
2056 }
2057
2058
2059 int wpas_stop_pno(struct wpa_supplicant *wpa_s)
2060 {
2061         int ret = 0;
2062
2063         if (!wpa_s->pno)
2064                 return 0;
2065
2066         ret = wpa_supplicant_stop_sched_scan(wpa_s);
2067
2068         wpa_s->pno = 0;
2069         wpa_s->pno_sched_pending = 0;
2070
2071         if (wpa_s->wpa_state == WPA_SCANNING)
2072                 wpa_supplicant_req_scan(wpa_s, 0, 0);
2073
2074         return ret;
2075 }