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;
 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         if (wpas_p2p_in_progress(wpa_s)) {
 660                 wpa_dbg(wpa_s, MSG_DEBUG, "Delay station mode scan while P2P operation is in progress");
 661                 wpa_supplicant_req_scan(wpa_s, 5, 0);
 662                 return;
 663         }
 664
 665         if (wpa_s->conf->ap_scan == 2)
 666                 max_ssids = 1;
 667         else {
 668                 max_ssids = wpa_s->max_scan_ssids;
 669                 if (max_ssids > WPAS_MAX_SCAN_SSIDS)
 670                         max_ssids = WPAS_MAX_SCAN_SSIDS;
 671         }
 672
 673         wpa_s->last_scan_req = wpa_s->scan_req;
 674         wpa_s->scan_req = NORMAL_SCAN_REQ;
 675
 676         os_memset(&params, 0, sizeof(params));
 677
 678         prev_state = wpa_s->wpa_state;
 679         if (wpa_s->wpa_state == WPA_DISCONNECTED ||
 680             wpa_s->wpa_state == WPA_INACTIVE)
 681                 wpa_supplicant_set_state(wpa_s, WPA_SCANNING);
 682
 683         /*
 684          * If autoscan has set its own scanning parameters
 685          */
 686         if (wpa_s->autoscan_params != NULL) {
 687                 scan_params = wpa_s->autoscan_params;
 688                 goto scan;
 689         }
 690
 691         if (wpa_s->last_scan_req != MANUAL_SCAN_REQ &&
 692             wpa_s->connect_without_scan) {
 693                 for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
 694                         if (ssid == wpa_s->connect_without_scan)
 695                                 break;
 696                 }
 697                 wpa_s->connect_without_scan = NULL;
 698                 if (ssid) {
 699                         wpa_printf(MSG_DEBUG, "Start a pre-selected network "
 700                                    "without scan step");
 701                         wpa_supplicant_associate(wpa_s, NULL, ssid);
 702                         return;
 703                 }
 704         }
 705
 706 #ifdef CONFIG_P2P
 707         if ((wpa_s->p2p_in_provisioning || wpa_s->show_group_started) &&
 708             wpa_s->go_params) {
 709                 wpa_printf(MSG_DEBUG, "P2P: Use specific SSID for scan during P2P group formation (p2p_in_provisioning=%d show_group_started=%d)",
 710                            wpa_s->p2p_in_provisioning,
 711                            wpa_s->show_group_started);
 712                 params.ssids[0].ssid = wpa_s->go_params->ssid;
 713                 params.ssids[0].ssid_len = wpa_s->go_params->ssid_len;
 714                 params.num_ssids = 1;
 715                 goto ssid_list_set;
 716         }
 717
 718         if (wpa_s->p2p_in_invitation) {
 719                 if (wpa_s->current_ssid) {
 720                         wpa_printf(MSG_DEBUG, "P2P: Use specific SSID for scan during invitation");
 721                         params.ssids[0].ssid = wpa_s->current_ssid->ssid;
 722                         params.ssids[0].ssid_len =
 723                                 wpa_s->current_ssid->ssid_len;
 724                         params.num_ssids = 1;
 725                 } else {
 726                         wpa_printf(MSG_DEBUG, "P2P: No specific SSID known for scan during invitation");
 727                 }
 728                 goto ssid_list_set;
 729         }
 730 #endif /* CONFIG_P2P */
 731
 732         /* Find the starting point from which to continue scanning */
 733         ssid = wpa_s->conf->ssid;
 734         if (wpa_s->prev_scan_ssid != WILDCARD_SSID_SCAN) {
 735                 while (ssid) {
 736                         if (ssid == wpa_s->prev_scan_ssid) {
 737                                 ssid = ssid->next;
 738                                 break;
 739                         }
 740                         ssid = ssid->next;
 741                 }
 742         }
 743
 744         if (wpa_s->last_scan_req != MANUAL_SCAN_REQ &&
 745             wpa_s->conf->ap_scan == 2) {
 746                 wpa_s->connect_without_scan = NULL;
 747                 wpa_s->prev_scan_wildcard = 0;
 748                 wpa_supplicant_assoc_try(wpa_s, ssid);
 749                 return;
 750         } else if (wpa_s->conf->ap_scan == 2) {
 751                 /*
 752                  * User-initiated scan request in ap_scan == 2; scan with
 753                  * wildcard SSID.
 754                  */
 755                 ssid = NULL;
 756         } else if (wpa_s->reattach && wpa_s->current_ssid != NULL) {
 757                 /*
 758                  * Perform single-channel single-SSID scan for
 759                  * reassociate-to-same-BSS operation.
 760                  */
 761                 /* Setup SSID */
 762                 ssid = wpa_s->current_ssid;
 763                 wpa_hexdump_ascii(MSG_DEBUG, "Scan SSID",
 764                                   ssid->ssid, ssid->ssid_len);
 765                 params.ssids[0].ssid = ssid->ssid;
 766                 params.ssids[0].ssid_len = ssid->ssid_len;
 767                 params.num_ssids = 1;
 768
 769                 /*
 770                  * Allocate memory for frequency array, allocate one extra
 771                  * slot for the zero-terminator.
 772                  */
 773                 params.freqs = os_malloc(sizeof(int) * 2);
 774                 if (params.freqs == NULL) {
 775                         wpa_dbg(wpa_s, MSG_ERROR, "Memory allocation failed");
 776                         return;
 777                 }
 778                 params.freqs[0] = wpa_s->assoc_freq;
 779                 params.freqs[1] = 0;
 780
 781                 /*
 782                  * Reset the reattach flag so that we fall back to full scan if
 783                  * this scan fails.
 784                  */
 785                 wpa_s->reattach = 0;
 786         } else {
 787                 struct wpa_ssid *start = ssid, *tssid;
 788                 int freqs_set = 0;
 789                 if (ssid == NULL && max_ssids > 1)
 790                         ssid = wpa_s->conf->ssid;
 791                 while (ssid) {
 792                         if (!wpas_network_disabled(wpa_s, ssid) &&
 793                             ssid->scan_ssid) {
 794                                 wpa_hexdump_ascii(MSG_DEBUG, "Scan SSID",
 795                                                   ssid->ssid, ssid->ssid_len);
 796                                 params.ssids[params.num_ssids].ssid =
 797                                         ssid->ssid;
 798                                 params.ssids[params.num_ssids].ssid_len =
 799                                         ssid->ssid_len;
 800                                 params.num_ssids++;
 801                                 if (params.num_ssids + 1 >= max_ssids)
 802                                         break;
 803                         }
 804                         ssid = ssid->next;
 805                         if (ssid == start)
 806                                 break;
 807                         if (ssid == NULL && max_ssids > 1 &&
 808                             start != wpa_s->conf->ssid)
 809                                 ssid = wpa_s->conf->ssid;
 810                 }
 811
 812                 if (wpa_s->scan_id_count &&
 813                     wpa_s->last_scan_req == MANUAL_SCAN_REQ)
 814                         wpa_set_scan_ssids(wpa_s, &params, max_ssids);
 815
 816                 for (tssid = wpa_s->conf->ssid; tssid; tssid = tssid->next) {
 817                         if (wpas_network_disabled(wpa_s, tssid))
 818                                 continue;
 819                         if ((params.freqs || !freqs_set) && tssid->scan_freq) {
 820                                 int_array_concat(&params.freqs,
 821                                                  tssid->scan_freq);
 822                         } else {
 823                                 os_free(params.freqs);
 824                                 params.freqs = NULL;
 825                         }
 826                         freqs_set = 1;
 827                 }
 828                 int_array_sort_unique(params.freqs);
 829         }
 830
 831         if (ssid && max_ssids == 1) {
 832                 /*
 833                  * If the driver is limited to 1 SSID at a time interleave
 834                  * wildcard SSID scans with specific SSID scans to avoid
 835                  * waiting a long time for a wildcard scan.
 836                  */
 837                 if (!wpa_s->prev_scan_wildcard) {
 838                         params.ssids[0].ssid = NULL;
 839                         params.ssids[0].ssid_len = 0;
 840                         wpa_s->prev_scan_wildcard = 1;
 841                         wpa_dbg(wpa_s, MSG_DEBUG, "Starting AP scan for "
 842                                 "wildcard SSID (Interleave with specific)");
 843                 } else {
 844                         wpa_s->prev_scan_ssid = ssid;
 845                         wpa_s->prev_scan_wildcard = 0;
 846                         wpa_dbg(wpa_s, MSG_DEBUG,
 847                                 "Starting AP scan for specific SSID: %s",
 848                                 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
 849                 }
 850         } else if (ssid) {
 851                 /* max_ssids > 1 */
 852
 853                 wpa_s->prev_scan_ssid = ssid;
 854                 wpa_dbg(wpa_s, MSG_DEBUG, "Include wildcard SSID in "
 855                         "the scan request");
 856                 params.num_ssids++;
 857         } else if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
 858                    wpa_s->manual_scan_passive && params.num_ssids == 0) {
 859                 wpa_dbg(wpa_s, MSG_DEBUG, "Use passive scan based on manual request");
 860         } else {
 861                 wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
 862                 params.num_ssids++;
 863                 wpa_dbg(wpa_s, MSG_DEBUG, "Starting AP scan for wildcard "
 864                         "SSID");
 865         }
 866 #ifdef CONFIG_P2P
 867 ssid_list_set:
 868 #endif /* CONFIG_P2P */
 869
 870         wpa_supplicant_optimize_freqs(wpa_s, &params);
 871         extra_ie = wpa_supplicant_extra_ies(wpa_s);
 872
 873         if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
 874             wpa_s->manual_scan_only_new)
 875                 params.only_new_results = 1;
 876
 877         if (wpa_s->last_scan_req == MANUAL_SCAN_REQ && params.freqs == NULL &&
 878             wpa_s->manual_scan_freqs) {
 879                 wpa_dbg(wpa_s, MSG_DEBUG, "Limit manual scan to specified channels");
 880                 params.freqs = wpa_s->manual_scan_freqs;
 881                 wpa_s->manual_scan_freqs = NULL;
 882         }
 883
 884         if (params.freqs == NULL && wpa_s->next_scan_freqs) {
 885                 wpa_dbg(wpa_s, MSG_DEBUG, "Optimize scan based on previously "
 886                         "generated frequency list");
 887                 params.freqs = wpa_s->next_scan_freqs;
 888         } else
 889                 os_free(wpa_s->next_scan_freqs);
 890         wpa_s->next_scan_freqs = NULL;
 891         wpa_setband_scan_freqs(wpa_s, &params);
 892
 893         /* See if user specified frequencies. If so, scan only those. */
 894         if (wpa_s->conf->freq_list && !params.freqs) {
 895                 wpa_dbg(wpa_s, MSG_DEBUG,
 896                         "Optimize scan based on conf->freq_list");
 897                 int_array_concat(&params.freqs, wpa_s->conf->freq_list);
 898         }
 899
 900         /* Use current associated channel? */
 901         if (wpa_s->conf->scan_cur_freq && !params.freqs) {
 902                 unsigned int num = wpa_s->num_multichan_concurrent;
 903
 904                 params.freqs = os_calloc(num + 1, sizeof(int));
 905                 if (params.freqs) {
 906                         num = get_shared_radio_freqs(wpa_s, params.freqs, num);
 907                         if (num > 0) {
 908                                 wpa_dbg(wpa_s, MSG_DEBUG, "Scan only the "
 909                                         "current operating channels since "
 910                                         "scan_cur_freq is enabled");
 911                         } else {
 912                                 os_free(params.freqs);
 913                                 params.freqs = NULL;
 914                         }
 915                 }
 916         }
 917
 918         params.filter_ssids = wpa_supplicant_build_filter_ssids(
 919                 wpa_s->conf, &params.num_filter_ssids);
 920         if (extra_ie) {
 921                 params.extra_ies = wpabuf_head(extra_ie);
 922                 params.extra_ies_len = wpabuf_len(extra_ie);
 923         }
 924
 925 #ifdef CONFIG_P2P
 926         if (wpa_s->p2p_in_provisioning || wpa_s->p2p_in_invitation ||
 927             (wpa_s->show_group_started && wpa_s->go_params)) {
 928                 /*
 929                  * The interface may not yet be in P2P mode, so we have to
 930                  * explicitly request P2P probe to disable CCK rates.
 931                  */
 932                 params.p2p_probe = 1;
 933         }
 934 #endif /* CONFIG_P2P */
 935
 936         scan_params = &params;
 937
 938 scan:
 939 #ifdef CONFIG_P2P
 940         /*
 941          * If the driver does not support multi-channel concurrency and a
 942          * virtual interface that shares the same radio with the wpa_s interface
 943          * is operating there may not be need to scan other channels apart from
 944          * the current operating channel on the other virtual interface. Filter
 945          * out other channels in case we are trying to find a connection for a
 946          * station interface when we are not configured to prefer station
 947          * connection and a concurrent operation is already in process.
 948          */
 949         if (wpa_s->scan_for_connection &&
 950             wpa_s->last_scan_req == NORMAL_SCAN_REQ &&
 951             !scan_params->freqs && !params.freqs &&
 952             wpas_is_p2p_prioritized(wpa_s) &&
 953             wpa_s->p2p_group_interface == NOT_P2P_GROUP_INTERFACE &&
 954             non_p2p_network_enabled(wpa_s)) {
 955                 unsigned int num = wpa_s->num_multichan_concurrent;
 956
 957                 params.freqs = os_calloc(num + 1, sizeof(int));
 958                 if (params.freqs) {
 959                         num = get_shared_radio_freqs(wpa_s, params.freqs, num);
 960                         if (num > 0 && num == wpa_s->num_multichan_concurrent) {
 961                                 wpa_dbg(wpa_s, MSG_DEBUG, "Scan only the current operating channels since all channels are already used");
 962                         } else {
 963                                 os_free(params.freqs);
 964                                 params.freqs = NULL;
 965                         }
 966                 }
 967         }
 968 #endif /* CONFIG_P2P */
 969
 970         ret = wpa_supplicant_trigger_scan(wpa_s, scan_params);
 971
 972         if (ret && wpa_s->last_scan_req == MANUAL_SCAN_REQ && params.freqs &&
 973             !wpa_s->manual_scan_freqs) {
 974                 /* Restore manual_scan_freqs for the next attempt */
 975                 wpa_s->manual_scan_freqs = params.freqs;
 976                 params.freqs = NULL;
 977         }
 978
 979         wpabuf_free(extra_ie);
 980         os_free(params.freqs);
 981         os_free(params.filter_ssids);
 982
 983         if (ret) {
 984                 wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate AP scan");
 985                 if (prev_state != wpa_s->wpa_state)
 986                         wpa_supplicant_set_state(wpa_s, prev_state);
 987                 /* Restore scan_req since we will try to scan again */
 988                 wpa_s->scan_req = wpa_s->last_scan_req;
 989                 wpa_supplicant_req_scan(wpa_s, 1, 0);
 990         } else {
 991                 wpa_s->scan_for_connection = 0;
 992         }
 993 }
 994
 995
 996 void wpa_supplicant_update_scan_int(struct wpa_supplicant *wpa_s, int sec)
 997 {
 998         struct os_reltime remaining, new_int;
 999         int cancelled;
1000
1001         cancelled = eloop_cancel_timeout_one(wpa_supplicant_scan, wpa_s, NULL,
1002                                              &remaining);
1003
1004         new_int.sec = sec;
1005         new_int.usec = 0;
1006         if (cancelled && os_reltime_before(&remaining, &new_int)) {
1007                 new_int.sec = remaining.sec;
1008                 new_int.usec = remaining.usec;
1009         }
1010
1011         if (cancelled) {
1012                 eloop_register_timeout(new_int.sec, new_int.usec,
1013                                        wpa_supplicant_scan, wpa_s, NULL);
1014         }
1015         wpa_s->scan_interval = sec;
1016 }
1017
1018
1019 /**
1020  * wpa_supplicant_req_scan - Schedule a scan for neighboring access points
1021  * @wpa_s: Pointer to wpa_supplicant data
1022  * @sec: Number of seconds after which to scan
1023  * @usec: Number of microseconds after which to scan
1024  *
1025  * This function is used to schedule a scan for neighboring access points after
1026  * the specified time.
1027  */
1028 void wpa_supplicant_req_scan(struct wpa_supplicant *wpa_s, int sec, int usec)
1029 {
1030         int res = eloop_deplete_timeout(sec, usec, wpa_supplicant_scan, wpa_s,
1031                                         NULL);
1032         if (res == 1) {
1033                 wpa_dbg(wpa_s, MSG_DEBUG, "Rescheduling scan request: %d.%06d sec",
1034                         sec, usec);
1035         } else if (res == 0) {
1036                 wpa_dbg(wpa_s, MSG_DEBUG, "Ignore new scan request for %d.%06d sec since an earlier request is scheduled to trigger sooner",
1037                         sec, usec);
1038         } else {
1039                 wpa_dbg(wpa_s, MSG_DEBUG, "Setting scan request: %d.%06d sec",
1040                         sec, usec);
1041                 eloop_register_timeout(sec, usec, wpa_supplicant_scan, wpa_s, NULL);
1042         }
1043 }
1044
1045
1046 /**
1047  * wpa_supplicant_delayed_sched_scan - Request a delayed scheduled scan
1048  * @wpa_s: Pointer to wpa_supplicant data
1049  * @sec: Number of seconds after which to scan
1050  * @usec: Number of microseconds after which to scan
1051  * Returns: 0 on success or -1 otherwise
1052  *
1053  * This function is used to schedule periodic scans for neighboring
1054  * access points after the specified time.
1055  */
1056 int wpa_supplicant_delayed_sched_scan(struct wpa_supplicant *wpa_s,
1057                                       int sec, int usec)
1058 {
1059         if (!wpa_s->sched_scan_supported)
1060                 return -1;
1061
1062         eloop_register_timeout(sec, usec,
1063                                wpa_supplicant_delayed_sched_scan_timeout,
1064                                wpa_s, NULL);
1065
1066         return 0;
1067 }
1068
1069
1070 /**
1071  * wpa_supplicant_req_sched_scan - Start a periodic scheduled scan
1072  * @wpa_s: Pointer to wpa_supplicant data
1073  * Returns: 0 is sched_scan was started or -1 otherwise
1074  *
1075  * This function is used to schedule periodic scans for neighboring
1076  * access points repeating the scan continuously.
1077  */
1078 int wpa_supplicant_req_sched_scan(struct wpa_supplicant *wpa_s)
1079 {
1080         struct wpa_driver_scan_params params;
1081         struct wpa_driver_scan_params *scan_params;
1082         enum wpa_states prev_state;
1083         struct wpa_ssid *ssid = NULL;
1084         struct wpabuf *extra_ie = NULL;
1085         int ret;
1086         unsigned int max_sched_scan_ssids;
1087         int wildcard = 0;
1088         int need_ssids;
1089
1090         if (!wpa_s->sched_scan_supported)
1091                 return -1;
1092
1093         if (wpa_s->max_sched_scan_ssids > WPAS_MAX_SCAN_SSIDS)
1094                 max_sched_scan_ssids = WPAS_MAX_SCAN_SSIDS;
1095         else
1096                 max_sched_scan_ssids = wpa_s->max_sched_scan_ssids;
1097         if (max_sched_scan_ssids < 1 || wpa_s->conf->disable_scan_offload)
1098                 return -1;
1099
1100         if (wpa_s->sched_scanning) {
1101                 wpa_dbg(wpa_s, MSG_DEBUG, "Already sched scanning");
1102                 return 0;
1103         }
1104
1105         need_ssids = 0;
1106         for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
1107                 if (!wpas_network_disabled(wpa_s, ssid) && !ssid->scan_ssid) {
1108                         /* Use wildcard SSID to find this network */
1109                         wildcard = 1;
1110                 } else if (!wpas_network_disabled(wpa_s, ssid) &&
1111                            ssid->ssid_len)
1112                         need_ssids++;
1113
1114 #ifdef CONFIG_WPS
1115                 if (!wpas_network_disabled(wpa_s, ssid) &&
1116                     ssid->key_mgmt == WPA_KEY_MGMT_WPS) {
1117                         /*
1118                          * Normal scan is more reliable and faster for WPS
1119                          * operations and since these are for short periods of
1120                          * time, the benefit of trying to use sched_scan would
1121                          * be limited.
1122                          */
1123                         wpa_dbg(wpa_s, MSG_DEBUG, "Use normal scan instead of "
1124                                 "sched_scan for WPS");
1125                         return -1;
1126                 }
1127 #endif /* CONFIG_WPS */
1128         }
1129         if (wildcard)
1130                 need_ssids++;
1131
1132         if (wpa_s->normal_scans < 3 &&
1133             (need_ssids <= wpa_s->max_scan_ssids ||
1134              wpa_s->max_scan_ssids >= (int) max_sched_scan_ssids)) {
1135                 /*
1136                  * When normal scan can speed up operations, use that for the
1137                  * first operations before starting the sched_scan to allow
1138                  * user space sleep more. We do this only if the normal scan
1139                  * has functionality that is suitable for this or if the
1140                  * sched_scan does not have better support for multiple SSIDs.
1141                  */
1142                 wpa_dbg(wpa_s, MSG_DEBUG, "Use normal scan instead of "
1143                         "sched_scan for initial scans (normal_scans=%d)",
1144                         wpa_s->normal_scans);
1145                 return -1;
1146         }
1147
1148         os_memset(&params, 0, sizeof(params));
1149
1150         /* If we can't allocate space for the filters, we just don't filter */
1151         params.filter_ssids = os_zalloc(wpa_s->max_match_sets *
1152                                         sizeof(struct wpa_driver_scan_filter));
1153
1154         prev_state = wpa_s->wpa_state;
1155         if (wpa_s->wpa_state == WPA_DISCONNECTED ||
1156             wpa_s->wpa_state == WPA_INACTIVE)
1157                 wpa_supplicant_set_state(wpa_s, WPA_SCANNING);
1158
1159         if (wpa_s->autoscan_params != NULL) {
1160                 scan_params = wpa_s->autoscan_params;
1161                 goto scan;
1162         }
1163
1164         /* Find the starting point from which to continue scanning */
1165         ssid = wpa_s->conf->ssid;
1166         if (wpa_s->prev_sched_ssid) {
1167                 while (ssid) {
1168                         if (ssid == wpa_s->prev_sched_ssid) {
1169                                 ssid = ssid->next;
1170                                 break;
1171                         }
1172                         ssid = ssid->next;
1173                 }
1174         }
1175
1176         if (!ssid || !wpa_s->prev_sched_ssid) {
1177                 wpa_dbg(wpa_s, MSG_DEBUG, "Beginning of SSID list");
1178                 if (wpa_s->conf->sched_scan_interval)
1179                         wpa_s->sched_scan_interval =
1180                                 wpa_s->conf->sched_scan_interval;
1181                 if (wpa_s->sched_scan_interval == 0)
1182                         wpa_s->sched_scan_interval = 10;
1183                 wpa_s->sched_scan_timeout = max_sched_scan_ssids * 2;
1184                 wpa_s->first_sched_scan = 1;
1185                 ssid = wpa_s->conf->ssid;
1186                 wpa_s->prev_sched_ssid = ssid;
1187         }
1188
1189         if (wildcard) {
1190                 wpa_dbg(wpa_s, MSG_DEBUG, "Add wildcard SSID to sched_scan");
1191                 params.num_ssids++;
1192         }
1193
1194         while (ssid) {
1195                 if (wpas_network_disabled(wpa_s, ssid))
1196                         goto next;
1197
1198                 if (params.num_filter_ssids < wpa_s->max_match_sets &&
1199                     params.filter_ssids && ssid->ssid && ssid->ssid_len) {
1200                         wpa_dbg(wpa_s, MSG_DEBUG, "add to filter ssid: %s",
1201                                 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
1202                         os_memcpy(params.filter_ssids[params.num_filter_ssids].ssid,
1203                                   ssid->ssid, ssid->ssid_len);
1204                         params.filter_ssids[params.num_filter_ssids].ssid_len =
1205                                 ssid->ssid_len;
1206                         params.num_filter_ssids++;
1207                 } else if (params.filter_ssids && ssid->ssid && ssid->ssid_len)
1208                 {
1209                         wpa_dbg(wpa_s, MSG_DEBUG, "Not enough room for SSID "
1210                                 "filter for sched_scan - drop filter");
1211                         os_free(params.filter_ssids);
1212                         params.filter_ssids = NULL;
1213                         params.num_filter_ssids = 0;
1214                 }
1215
1216                 if (ssid->scan_ssid && ssid->ssid && ssid->ssid_len) {
1217                         if (params.num_ssids == max_sched_scan_ssids)
1218                                 break; /* only room for broadcast SSID */
1219                         wpa_dbg(wpa_s, MSG_DEBUG,
1220                                 "add to active scan ssid: %s",
1221                                 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
1222                         params.ssids[params.num_ssids].ssid =
1223                                 ssid->ssid;
1224                         params.ssids[params.num_ssids].ssid_len =
1225                                 ssid->ssid_len;
1226                         params.num_ssids++;
1227                         if (params.num_ssids >= max_sched_scan_ssids) {
1228                                 wpa_s->prev_sched_ssid = ssid;
1229                                 do {
1230                                         ssid = ssid->next;
1231                                 } while (ssid &&
1232                                          (wpas_network_disabled(wpa_s, ssid) ||
1233                                           !ssid->scan_ssid));
1234                                 break;
1235                         }
1236                 }
1237
1238         next:
1239                 wpa_s->prev_sched_ssid = ssid;
1240                 ssid = ssid->next;
1241         }
1242
1243         if (params.num_filter_ssids == 0) {
1244                 os_free(params.filter_ssids);
1245                 params.filter_ssids = NULL;
1246         }
1247
1248         extra_ie = wpa_supplicant_extra_ies(wpa_s);
1249         if (extra_ie) {
1250                 params.extra_ies = wpabuf_head(extra_ie);
1251                 params.extra_ies_len = wpabuf_len(extra_ie);
1252         }
1253
1254         if (wpa_s->conf->filter_rssi)
1255                 params.filter_rssi = wpa_s->conf->filter_rssi;
1256
1257         /* See if user specified frequencies. If so, scan only those. */
1258         if (wpa_s->conf->freq_list && !params.freqs) {
1259                 wpa_dbg(wpa_s, MSG_DEBUG,
1260                         "Optimize scan based on conf->freq_list");
1261                 int_array_concat(&params.freqs, wpa_s->conf->freq_list);
1262         }
1263
1264         scan_params = &params;
1265
1266 scan:
1267         if (ssid || !wpa_s->first_sched_scan) {
1268                 wpa_dbg(wpa_s, MSG_DEBUG,
1269                         "Starting sched scan: interval %d timeout %d",
1270                         wpa_s->sched_scan_interval, wpa_s->sched_scan_timeout);
1271         } else {
1272                 wpa_dbg(wpa_s, MSG_DEBUG,
1273                         "Starting sched scan: interval %d (no timeout)",
1274                         wpa_s->sched_scan_interval);
1275         }
1276
1277         wpa_setband_scan_freqs(wpa_s, scan_params);
1278
1279         ret = wpa_supplicant_start_sched_scan(wpa_s, scan_params,
1280                                               wpa_s->sched_scan_interval);
1281         wpabuf_free(extra_ie);
1282         os_free(params.filter_ssids);
1283         if (ret) {
1284                 wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate sched scan");
1285                 if (prev_state != wpa_s->wpa_state)
1286                         wpa_supplicant_set_state(wpa_s, prev_state);
1287                 return ret;
1288         }
1289
1290         /* If we have more SSIDs to scan, add a timeout so we scan them too */
1291         if (ssid || !wpa_s->first_sched_scan) {
1292                 wpa_s->sched_scan_timed_out = 0;
1293                 eloop_register_timeout(wpa_s->sched_scan_timeout, 0,
1294                                        wpa_supplicant_sched_scan_timeout,
1295                                        wpa_s, NULL);
1296                 wpa_s->first_sched_scan = 0;
1297                 wpa_s->sched_scan_timeout /= 2;
1298                 wpa_s->sched_scan_interval *= 2;
1299                 if (wpa_s->sched_scan_timeout < wpa_s->sched_scan_interval) {
1300                         wpa_s->sched_scan_interval = 10;
1301                         wpa_s->sched_scan_timeout = max_sched_scan_ssids * 2;
1302                 }
1303         }
1304
1305         /* If there is no more ssids, start next time from the beginning */
1306         if (!ssid)
1307                 wpa_s->prev_sched_ssid = NULL;
1308
1309         return 0;
1310 }
1311
1312
1313 /**
1314  * wpa_supplicant_cancel_scan - Cancel a scheduled scan request
1315  * @wpa_s: Pointer to wpa_supplicant data
1316  *
1317  * This function is used to cancel a scan request scheduled with
1318  * wpa_supplicant_req_scan().
1319  */
1320 void wpa_supplicant_cancel_scan(struct wpa_supplicant *wpa_s)
1321 {
1322         wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling scan request");
1323         eloop_cancel_timeout(wpa_supplicant_scan, wpa_s, NULL);
1324 }
1325
1326
1327 /**
1328  * wpa_supplicant_cancel_delayed_sched_scan - Stop a delayed scheduled scan
1329  * @wpa_s: Pointer to wpa_supplicant data
1330  *
1331  * This function is used to stop a delayed scheduled scan.
1332  */
1333 void wpa_supplicant_cancel_delayed_sched_scan(struct wpa_supplicant *wpa_s)
1334 {
1335         if (!wpa_s->sched_scan_supported)
1336                 return;
1337
1338         wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling delayed sched scan");
1339         eloop_cancel_timeout(wpa_supplicant_delayed_sched_scan_timeout,
1340                              wpa_s, NULL);
1341 }
1342
1343
1344 /**
1345  * wpa_supplicant_cancel_sched_scan - Stop running scheduled scans
1346  * @wpa_s: Pointer to wpa_supplicant data
1347  *
1348  * This function is used to stop a periodic scheduled scan.
1349  */
1350 void wpa_supplicant_cancel_sched_scan(struct wpa_supplicant *wpa_s)
1351 {
1352         if (!wpa_s->sched_scanning)
1353                 return;
1354
1355         wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling sched scan");
1356         eloop_cancel_timeout(wpa_supplicant_sched_scan_timeout, wpa_s, NULL);
1357         wpa_supplicant_stop_sched_scan(wpa_s);
1358 }
1359
1360
1361 /**
1362  * wpa_supplicant_notify_scanning - Indicate possible scan state change
1363  * @wpa_s: Pointer to wpa_supplicant data
1364  * @scanning: Whether scanning is currently in progress
1365  *
1366  * This function is to generate scanning notifycations. It is called whenever
1367  * there may have been a change in scanning (scan started, completed, stopped).
1368  * wpas_notify_scanning() is called whenever the scanning state changed from the
1369  * previously notified state.
1370  */
1371 void wpa_supplicant_notify_scanning(struct wpa_supplicant *wpa_s,
1372                                     int scanning)
1373 {
1374         if (wpa_s->scanning != scanning) {
1375                 wpa_s->scanning = scanning;
1376                 wpas_notify_scanning(wpa_s);
1377         }
1378 }
1379
1380
1381 static int wpa_scan_get_max_rate(const struct wpa_scan_res *res)
1382 {
1383         int rate = 0;
1384         const u8 *ie;
1385         int i;
1386
1387         ie = wpa_scan_get_ie(res, WLAN_EID_SUPP_RATES);
1388         for (i = 0; ie && i < ie[1]; i++) {
1389                 if ((ie[i + 2] & 0x7f) > rate)
1390                         rate = ie[i + 2] & 0x7f;
1391         }
1392
1393         ie = wpa_scan_get_ie(res, WLAN_EID_EXT_SUPP_RATES);
1394         for (i = 0; ie && i < ie[1]; i++) {
1395                 if ((ie[i + 2] & 0x7f) > rate)
1396                         rate = ie[i + 2] & 0x7f;
1397         }
1398
1399         return rate;
1400 }
1401
1402
1403 /**
1404  * wpa_scan_get_ie - Fetch a specified information element from a scan result
1405  * @res: Scan result entry
1406  * @ie: Information element identitifier (WLAN_EID_*)
1407  * Returns: Pointer to the information element (id field) or %NULL if not found
1408  *
1409  * This function returns the first matching information element in the scan
1410  * result.
1411  */
1412 const u8 * wpa_scan_get_ie(const struct wpa_scan_res *res, u8 ie)
1413 {
1414         const u8 *end, *pos;
1415
1416         pos = (const u8 *) (res + 1);
1417         end = pos + res->ie_len;
1418
1419         while (pos + 1 < end) {
1420                 if (pos + 2 + pos[1] > end)
1421                         break;
1422                 if (pos[0] == ie)
1423                         return pos;
1424                 pos += 2 + pos[1];
1425         }
1426
1427         return NULL;
1428 }
1429
1430
1431 /**
1432  * wpa_scan_get_vendor_ie - Fetch vendor information element from a scan result
1433  * @res: Scan result entry
1434  * @vendor_type: Vendor type (four octets starting the IE payload)
1435  * Returns: Pointer to the information element (id field) or %NULL if not found
1436  *
1437  * This function returns the first matching information element in the scan
1438  * result.
1439  */
1440 const u8 * wpa_scan_get_vendor_ie(const struct wpa_scan_res *res,
1441                                   u32 vendor_type)
1442 {
1443         const u8 *end, *pos;
1444
1445         pos = (const u8 *) (res + 1);
1446         end = pos + res->ie_len;
1447
1448         while (pos + 1 < end) {
1449                 if (pos + 2 + pos[1] > end)
1450                         break;
1451                 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1452                     vendor_type == WPA_GET_BE32(&pos[2]))
1453                         return pos;
1454                 pos += 2 + pos[1];
1455         }
1456
1457         return NULL;
1458 }
1459
1460
1461 /**
1462  * wpa_scan_get_vendor_ie_beacon - Fetch vendor information from a scan result
1463  * @res: Scan result entry
1464  * @vendor_type: Vendor type (four octets starting the IE payload)
1465  * Returns: Pointer to the information element (id field) or %NULL if not found
1466  *
1467  * This function returns the first matching information element in the scan
1468  * result.
1469  *
1470  * This function is like wpa_scan_get_vendor_ie(), but uses IE buffer only
1471  * from Beacon frames instead of either Beacon or Probe Response frames.
1472  */
1473 const u8 * wpa_scan_get_vendor_ie_beacon(const struct wpa_scan_res *res,
1474                                          u32 vendor_type)
1475 {
1476         const u8 *end, *pos;
1477
1478         if (res->beacon_ie_len == 0)
1479                 return NULL;
1480
1481         pos = (const u8 *) (res + 1);
1482         pos += res->ie_len;
1483         end = pos + res->beacon_ie_len;
1484
1485         while (pos + 1 < end) {
1486                 if (pos + 2 + pos[1] > end)
1487                         break;
1488                 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1489                     vendor_type == WPA_GET_BE32(&pos[2]))
1490                         return pos;
1491                 pos += 2 + pos[1];
1492         }
1493
1494         return NULL;
1495 }
1496
1497
1498 /**
1499  * wpa_scan_get_vendor_ie_multi - Fetch vendor IE data from a scan result
1500  * @res: Scan result entry
1501  * @vendor_type: Vendor type (four octets starting the IE payload)
1502  * Returns: Pointer to the information element payload or %NULL if not found
1503  *
1504  * This function returns concatenated payload of possibly fragmented vendor
1505  * specific information elements in the scan result. The caller is responsible
1506  * for freeing the returned buffer.
1507  */
1508 struct wpabuf * wpa_scan_get_vendor_ie_multi(const struct wpa_scan_res *res,
1509                                              u32 vendor_type)
1510 {
1511         struct wpabuf *buf;
1512         const u8 *end, *pos;
1513
1514         buf = wpabuf_alloc(res->ie_len);
1515         if (buf == NULL)
1516                 return NULL;
1517
1518         pos = (const u8 *) (res + 1);
1519         end = pos + res->ie_len;
1520
1521         while (pos + 1 < end) {
1522                 if (pos + 2 + pos[1] > end)
1523                         break;
1524                 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1525                     vendor_type == WPA_GET_BE32(&pos[2]))
1526                         wpabuf_put_data(buf, pos + 2 + 4, pos[1] - 4);
1527                 pos += 2 + pos[1];
1528         }
1529
1530         if (wpabuf_len(buf) == 0) {
1531                 wpabuf_free(buf);
1532                 buf = NULL;
1533         }
1534
1535         return buf;
1536 }
1537
1538
1539 /*
1540  * Channels with a great SNR can operate at full rate. What is a great SNR?
1541  * This doc https://supportforums.cisco.com/docs/DOC-12954 says, "the general
1542  * rule of thumb is that any SNR above 20 is good." This one
1543  * http://www.cisco.com/en/US/tech/tk722/tk809/technologies_q_and_a_item09186a00805e9a96.shtml#qa23
1544  * recommends 25 as a minimum SNR for 54 Mbps data rate. 30 is chosen here as a
1545  * conservative value.
1546  */
1547 #define GREAT_SNR 30
1548
1549 /* Compare function for sorting scan results. Return >0 if @b is considered
1550  * better. */
1551 static int wpa_scan_result_compar(const void *a, const void *b)
1552 {
1553 #define IS_5GHZ(n) (n > 4000)
1554 #define MIN(a,b) a < b ? a : b
1555         struct wpa_scan_res **_wa = (void *) a;
1556         struct wpa_scan_res **_wb = (void *) b;
1557         struct wpa_scan_res *wa = *_wa;
1558         struct wpa_scan_res *wb = *_wb;
1559         int wpa_a, wpa_b, maxrate_a, maxrate_b;
1560         int snr_a, snr_b;
1561
1562         /* WPA/WPA2 support preferred */
1563         wpa_a = wpa_scan_get_vendor_ie(wa, WPA_IE_VENDOR_TYPE) != NULL ||
1564                 wpa_scan_get_ie(wa, WLAN_EID_RSN) != NULL;
1565         wpa_b = wpa_scan_get_vendor_ie(wb, WPA_IE_VENDOR_TYPE) != NULL ||
1566                 wpa_scan_get_ie(wb, WLAN_EID_RSN) != NULL;
1567
1568         if (wpa_b && !wpa_a)
1569                 return 1;
1570         if (!wpa_b && wpa_a)
1571                 return -1;
1572
1573         /* privacy support preferred */
1574         if ((wa->caps & IEEE80211_CAP_PRIVACY) == 0 &&
1575             (wb->caps & IEEE80211_CAP_PRIVACY))
1576                 return 1;
1577         if ((wa->caps & IEEE80211_CAP_PRIVACY) &&
1578             (wb->caps & IEEE80211_CAP_PRIVACY) == 0)
1579                 return -1;
1580
1581         if ((wa->flags & wb->flags & WPA_SCAN_LEVEL_DBM) &&
1582             !((wa->flags | wb->flags) & WPA_SCAN_NOISE_INVALID)) {
1583                 snr_a = MIN(wa->level - wa->noise, GREAT_SNR);
1584                 snr_b = MIN(wb->level - wb->noise, GREAT_SNR);
1585         } else {
1586                 /* Not suitable information to calculate SNR, so use level */
1587                 snr_a = wa->level;
1588                 snr_b = wb->level;
1589         }
1590
1591         /* best/max rate preferred if SNR close enough */
1592         if ((snr_a && snr_b && abs(snr_b - snr_a) < 5) ||
1593             (wa->qual && wb->qual && abs(wb->qual - wa->qual) < 10)) {
1594                 maxrate_a = wpa_scan_get_max_rate(wa);
1595                 maxrate_b = wpa_scan_get_max_rate(wb);
1596                 if (maxrate_a != maxrate_b)
1597                         return maxrate_b - maxrate_a;
1598                 if (IS_5GHZ(wa->freq) ^ IS_5GHZ(wb->freq))
1599                         return IS_5GHZ(wa->freq) ? -1 : 1;
1600         }
1601
1602         /* use freq for channel preference */
1603
1604         /* all things being equal, use SNR; if SNRs are
1605          * identical, use quality values since some drivers may only report
1606          * that value and leave the signal level zero */
1607         if (snr_b == snr_a)
1608                 return wb->qual - wa->qual;
1609         return snr_b - snr_a;
1610 #undef MIN
1611 #undef IS_5GHZ
1612 }
1613
1614
1615 #ifdef CONFIG_WPS
1616 /* Compare function for sorting scan results when searching a WPS AP for
1617  * provisioning. Return >0 if @b is considered better. */
1618 static int wpa_scan_result_wps_compar(const void *a, const void *b)
1619 {
1620         struct wpa_scan_res **_wa = (void *) a;
1621         struct wpa_scan_res **_wb = (void *) b;
1622         struct wpa_scan_res *wa = *_wa;
1623         struct wpa_scan_res *wb = *_wb;
1624         int uses_wps_a, uses_wps_b;
1625         struct wpabuf *wps_a, *wps_b;
1626         int res;
1627
1628         /* Optimization - check WPS IE existence before allocated memory and
1629          * doing full reassembly. */
1630         uses_wps_a = wpa_scan_get_vendor_ie(wa, WPS_IE_VENDOR_TYPE) != NULL;
1631         uses_wps_b = wpa_scan_get_vendor_ie(wb, WPS_IE_VENDOR_TYPE) != NULL;
1632         if (uses_wps_a && !uses_wps_b)
1633                 return -1;
1634         if (!uses_wps_a && uses_wps_b)
1635                 return 1;
1636
1637         if (uses_wps_a && uses_wps_b) {
1638                 wps_a = wpa_scan_get_vendor_ie_multi(wa, WPS_IE_VENDOR_TYPE);
1639                 wps_b = wpa_scan_get_vendor_ie_multi(wb, WPS_IE_VENDOR_TYPE);
1640                 res = wps_ap_priority_compar(wps_a, wps_b);
1641                 wpabuf_free(wps_a);
1642                 wpabuf_free(wps_b);
1643                 if (res)
1644                         return res;
1645         }
1646
1647         /*
1648          * Do not use current AP security policy as a sorting criteria during
1649          * WPS provisioning step since the AP may get reconfigured at the
1650          * completion of provisioning.
1651          */
1652
1653         /* all things being equal, use signal level; if signal levels are
1654          * identical, use quality values since some drivers may only report
1655          * that value and leave the signal level zero */
1656         if (wb->level == wa->level)
1657                 return wb->qual - wa->qual;
1658         return wb->level - wa->level;
1659 }
1660 #endif /* CONFIG_WPS */
1661
1662
1663 static void dump_scan_res(struct wpa_scan_results *scan_res)
1664 {
1665 #ifndef CONFIG_NO_STDOUT_DEBUG
1666         size_t i;
1667
1668         if (scan_res->res == NULL || scan_res->num == 0)
1669                 return;
1670
1671         wpa_printf(MSG_EXCESSIVE, "Sorted scan results");
1672
1673         for (i = 0; i < scan_res->num; i++) {
1674                 struct wpa_scan_res *r = scan_res->res[i];
1675                 u8 *pos;
1676                 if ((r->flags & (WPA_SCAN_LEVEL_DBM | WPA_SCAN_NOISE_INVALID))
1677                     == WPA_SCAN_LEVEL_DBM) {
1678                         int snr = r->level - r->noise;
1679                         wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d "
1680                                    "noise=%d level=%d snr=%d%s flags=0x%x "
1681                                    "age=%u",
1682                                    MAC2STR(r->bssid), r->freq, r->qual,
1683                                    r->noise, r->level, snr,
1684                                    snr >= GREAT_SNR ? "*" : "", r->flags,
1685                                    r->age);
1686                 } else {
1687                         wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d "
1688                                    "noise=%d level=%d flags=0x%x age=%u",
1689                                    MAC2STR(r->bssid), r->freq, r->qual,
1690                                    r->noise, r->level, r->flags, r->age);
1691                 }
1692                 pos = (u8 *) (r + 1);
1693                 if (r->ie_len)
1694                         wpa_hexdump(MSG_EXCESSIVE, "IEs", pos, r->ie_len);
1695                 pos += r->ie_len;
1696                 if (r->beacon_ie_len)
1697                         wpa_hexdump(MSG_EXCESSIVE, "Beacon IEs",
1698                                     pos, r->beacon_ie_len);
1699         }
1700 #endif /* CONFIG_NO_STDOUT_DEBUG */
1701 }
1702
1703
1704 /**
1705  * wpa_supplicant_filter_bssid_match - Is the specified BSSID allowed
1706  * @wpa_s: Pointer to wpa_supplicant data
1707  * @bssid: BSSID to check
1708  * Returns: 0 if the BSSID is filtered or 1 if not
1709  *
1710  * This function is used to filter out specific BSSIDs from scan reslts mainly
1711  * for testing purposes (SET bssid_filter ctrl_iface command).
1712  */
1713 int wpa_supplicant_filter_bssid_match(struct wpa_supplicant *wpa_s,
1714                                       const u8 *bssid)
1715 {
1716         size_t i;
1717
1718         if (wpa_s->bssid_filter == NULL)
1719                 return 1;
1720
1721         for (i = 0; i < wpa_s->bssid_filter_count; i++) {
1722                 if (os_memcmp(wpa_s->bssid_filter + i * ETH_ALEN, bssid,
1723                               ETH_ALEN) == 0)
1724                         return 1;
1725         }
1726
1727         return 0;
1728 }
1729
1730
1731 static void filter_scan_res(struct wpa_supplicant *wpa_s,
1732                             struct wpa_scan_results *res)
1733 {
1734         size_t i, j;
1735
1736         if (wpa_s->bssid_filter == NULL)
1737                 return;
1738
1739         for (i = 0, j = 0; i < res->num; i++) {
1740                 if (wpa_supplicant_filter_bssid_match(wpa_s,
1741                                                       res->res[i]->bssid)) {
1742                         res->res[j++] = res->res[i];
1743                 } else {
1744                         os_free(res->res[i]);
1745                         res->res[i] = NULL;
1746                 }
1747         }
1748
1749         if (res->num != j) {
1750                 wpa_printf(MSG_DEBUG, "Filtered out %d scan results",
1751                            (int) (res->num - j));
1752                 res->num = j;
1753         }
1754 }
1755
1756
1757 /**
1758  * wpa_supplicant_get_scan_results - Get scan results
1759  * @wpa_s: Pointer to wpa_supplicant data
1760  * @info: Information about what was scanned or %NULL if not available
1761  * @new_scan: Whether a new scan was performed
1762  * Returns: Scan results, %NULL on failure
1763  *
1764  * This function request the current scan results from the driver and updates
1765  * the local BSS list wpa_s->bss. The caller is responsible for freeing the
1766  * results with wpa_scan_results_free().
1767  */
1768 struct wpa_scan_results *
1769 wpa_supplicant_get_scan_results(struct wpa_supplicant *wpa_s,
1770                                 struct scan_info *info, int new_scan)
1771 {
1772         struct wpa_scan_results *scan_res;
1773         size_t i;
1774         int (*compar)(const void *, const void *) = wpa_scan_result_compar;
1775
1776         scan_res = wpa_drv_get_scan_results2(wpa_s);
1777         if (scan_res == NULL) {
1778                 wpa_dbg(wpa_s, MSG_DEBUG, "Failed to get scan results");
1779                 return NULL;
1780         }
1781         if (scan_res->fetch_time.sec == 0) {
1782                 /*
1783                  * Make sure we have a valid timestamp if the driver wrapper
1784                  * does not set this.
1785                  */
1786                 os_get_reltime(&scan_res->fetch_time);
1787         }
1788         filter_scan_res(wpa_s, scan_res);
1789
1790 #ifdef CONFIG_WPS
1791         if (wpas_wps_searching(wpa_s)) {
1792                 wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Order scan results with WPS "
1793                         "provisioning rules");
1794                 compar = wpa_scan_result_wps_compar;
1795         }
1796 #endif /* CONFIG_WPS */
1797
1798         qsort(scan_res->res, scan_res->num, sizeof(struct wpa_scan_res *),
1799               compar);
1800         dump_scan_res(scan_res);
1801
1802         wpa_bss_update_start(wpa_s);
1803         for (i = 0; i < scan_res->num; i++)
1804                 wpa_bss_update_scan_res(wpa_s, scan_res->res[i],
1805                                         &scan_res->fetch_time);
1806         wpa_bss_update_end(wpa_s, info, new_scan);
1807
1808         return scan_res;
1809 }
1810
1811
1812 /**
1813  * wpa_supplicant_update_scan_results - Update scan results from the driver
1814  * @wpa_s: Pointer to wpa_supplicant data
1815  * Returns: 0 on success, -1 on failure
1816  *
1817  * This function updates the BSS table within wpa_supplicant based on the
1818  * currently available scan results from the driver without requesting a new
1819  * scan. This is used in cases where the driver indicates an association
1820  * (including roaming within ESS) and wpa_supplicant does not yet have the
1821  * needed information to complete the connection (e.g., to perform validation
1822  * steps in 4-way handshake).
1823  */
1824 int wpa_supplicant_update_scan_results(struct wpa_supplicant *wpa_s)
1825 {
1826         struct wpa_scan_results *scan_res;
1827         scan_res = wpa_supplicant_get_scan_results(wpa_s, NULL, 0);
1828         if (scan_res == NULL)
1829                 return -1;
1830         wpa_scan_results_free(scan_res);
1831
1832         return 0;
1833 }
1834
1835
1836 /**
1837  * scan_only_handler - Reports scan results
1838  */
1839 void scan_only_handler(struct wpa_supplicant *wpa_s,
1840                        struct wpa_scan_results *scan_res)
1841 {
1842         wpa_dbg(wpa_s, MSG_DEBUG, "Scan-only results received");
1843         if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
1844             wpa_s->manual_scan_use_id && wpa_s->own_scan_running) {
1845                 wpa_msg_ctrl(wpa_s, MSG_INFO, WPA_EVENT_SCAN_RESULTS "id=%u",
1846                              wpa_s->manual_scan_id);
1847                 wpa_s->manual_scan_use_id = 0;
1848         } else {
1849                 wpa_msg_ctrl(wpa_s, MSG_INFO, WPA_EVENT_SCAN_RESULTS);
1850         }
1851         wpas_notify_scan_results(wpa_s);
1852         wpas_notify_scan_done(wpa_s, 1);
1853         if (wpa_s->scan_work) {
1854                 struct wpa_radio_work *work = wpa_s->scan_work;
1855                 wpa_s->scan_work = NULL;
1856                 radio_work_done(work);
1857         }
1858 }
1859
1860
1861 int wpas_scan_scheduled(struct wpa_supplicant *wpa_s)
1862 {
1863         return eloop_is_timeout_registered(wpa_supplicant_scan, wpa_s, NULL);
1864 }
1865
1866
1867 struct wpa_driver_scan_params *
1868 wpa_scan_clone_params(const struct wpa_driver_scan_params *src)
1869 {
1870         struct wpa_driver_scan_params *params;
1871         size_t i;
1872         u8 *n;
1873
1874         params = os_zalloc(sizeof(*params));
1875         if (params == NULL)
1876                 return NULL;
1877
1878         for (i = 0; i < src->num_ssids; i++) {
1879                 if (src->ssids[i].ssid) {
1880                         n = os_malloc(src->ssids[i].ssid_len);
1881                         if (n == NULL)
1882                                 goto failed;
1883                         os_memcpy(n, src->ssids[i].ssid,
1884                                   src->ssids[i].ssid_len);
1885                         params->ssids[i].ssid = n;
1886                         params->ssids[i].ssid_len = src->ssids[i].ssid_len;
1887                 }
1888         }
1889         params->num_ssids = src->num_ssids;
1890
1891         if (src->extra_ies) {
1892                 n = os_malloc(src->extra_ies_len);
1893                 if (n == NULL)
1894                         goto failed;
1895                 os_memcpy(n, src->extra_ies, src->extra_ies_len);
1896                 params->extra_ies = n;
1897                 params->extra_ies_len = src->extra_ies_len;
1898         }
1899
1900         if (src->freqs) {
1901                 int len = int_array_len(src->freqs);
1902                 params->freqs = os_malloc((len + 1) * sizeof(int));
1903                 if (params->freqs == NULL)
1904                         goto failed;
1905                 os_memcpy(params->freqs, src->freqs, (len + 1) * sizeof(int));
1906         }
1907
1908         if (src->filter_ssids) {
1909                 params->filter_ssids = os_malloc(sizeof(*params->filter_ssids) *
1910                                                  src->num_filter_ssids);
1911                 if (params->filter_ssids == NULL)
1912                         goto failed;
1913                 os_memcpy(params->filter_ssids, src->filter_ssids,
1914                           sizeof(*params->filter_ssids) *
1915                           src->num_filter_ssids);
1916                 params->num_filter_ssids = src->num_filter_ssids;
1917         }
1918
1919         params->filter_rssi = src->filter_rssi;
1920         params->p2p_probe = src->p2p_probe;
1921         params->only_new_results = src->only_new_results;
1922         params->low_priority = src->low_priority;
1923
1924         return params;
1925
1926 failed:
1927         wpa_scan_free_params(params);
1928         return NULL;
1929 }
1930
1931
1932 void wpa_scan_free_params(struct wpa_driver_scan_params *params)
1933 {
1934         size_t i;
1935
1936         if (params == NULL)
1937                 return;
1938
1939         for (i = 0; i < params->num_ssids; i++)
1940                 os_free((u8 *) params->ssids[i].ssid);
1941         os_free((u8 *) params->extra_ies);
1942         os_free(params->freqs);
1943         os_free(params->filter_ssids);
1944         os_free(params);
1945 }
1946
1947
1948 int wpas_start_pno(struct wpa_supplicant *wpa_s)
1949 {
1950         int ret, interval;
1951         size_t i, num_ssid, num_match_ssid;
1952         struct wpa_ssid *ssid;
1953         struct wpa_driver_scan_params params;
1954
1955         if (!wpa_s->sched_scan_supported)
1956                 return -1;
1957
1958         if (wpa_s->pno || wpa_s->pno_sched_pending)
1959                 return 0;
1960
1961         if ((wpa_s->wpa_state > WPA_SCANNING) &&
1962             (wpa_s->wpa_state <= WPA_COMPLETED)) {
1963                 wpa_printf(MSG_ERROR, "PNO: In assoc process");
1964                 return -EAGAIN;
1965         }
1966
1967         if (wpa_s->wpa_state == WPA_SCANNING) {
1968                 wpa_supplicant_cancel_scan(wpa_s);
1969                 if (wpa_s->sched_scanning) {
1970                         wpa_printf(MSG_DEBUG, "Schedule PNO on completion of "
1971                                    "ongoing sched scan");
1972                         wpa_supplicant_cancel_sched_scan(wpa_s);
1973                         wpa_s->pno_sched_pending = 1;
1974                         return 0;
1975                 }
1976         }
1977
1978         os_memset(&params, 0, sizeof(params));
1979
1980         num_ssid = num_match_ssid = 0;
1981         ssid = wpa_s->conf->ssid;
1982         while (ssid) {
1983                 if (!wpas_network_disabled(wpa_s, ssid)) {
1984                         num_match_ssid++;
1985                         if (ssid->scan_ssid)
1986                                 num_ssid++;
1987                 }
1988                 ssid = ssid->next;
1989         }
1990
1991         if (num_match_ssid == 0) {
1992                 wpa_printf(MSG_DEBUG, "PNO: No configured SSIDs");
1993                 return -1;
1994         }
1995
1996         if (num_match_ssid > num_ssid) {
1997                 params.num_ssids++; /* wildcard */
1998                 num_ssid++;
1999         }
2000
2001         if (num_ssid > WPAS_MAX_SCAN_SSIDS) {
2002                 wpa_printf(MSG_DEBUG, "PNO: Use only the first %u SSIDs from "
2003                            "%u", WPAS_MAX_SCAN_SSIDS, (unsigned int) num_ssid);
2004                 num_ssid = WPAS_MAX_SCAN_SSIDS;
2005         }
2006
2007         if (num_match_ssid > wpa_s->max_match_sets) {
2008                 num_match_ssid = wpa_s->max_match_sets;
2009                 wpa_dbg(wpa_s, MSG_DEBUG, "PNO: Too many SSIDs to match");
2010         }
2011         params.filter_ssids = os_calloc(num_match_ssid,
2012                                         sizeof(struct wpa_driver_scan_filter));
2013         if (params.filter_ssids == NULL)
2014                 return -1;
2015         i = 0;
2016         ssid = wpa_s->conf->ssid;
2017         while (ssid) {
2018                 if (!wpas_network_disabled(wpa_s, ssid)) {
2019                         if (ssid->scan_ssid && params.num_ssids < num_ssid) {
2020                                 params.ssids[params.num_ssids].ssid =
2021                                         ssid->ssid;
2022                                 params.ssids[params.num_ssids].ssid_len =
2023                                          ssid->ssid_len;
2024                                 params.num_ssids++;
2025                         }
2026                         os_memcpy(params.filter_ssids[i].ssid, ssid->ssid,
2027                                   ssid->ssid_len);
2028                         params.filter_ssids[i].ssid_len = ssid->ssid_len;
2029                         params.num_filter_ssids++;
2030                         i++;
2031                         if (i == num_match_ssid)
2032                                 break;
2033                 }
2034                 ssid = ssid->next;
2035         }
2036
2037         if (wpa_s->conf->filter_rssi)
2038                 params.filter_rssi = wpa_s->conf->filter_rssi;
2039
2040         interval = wpa_s->conf->sched_scan_interval ?
2041                 wpa_s->conf->sched_scan_interval : 10;
2042
2043         if (params.freqs == NULL && wpa_s->manual_sched_scan_freqs) {
2044                 wpa_dbg(wpa_s, MSG_DEBUG, "Limit sched scan to specified channels");
2045                 params.freqs = wpa_s->manual_sched_scan_freqs;
2046         }
2047
2048         ret = wpa_supplicant_start_sched_scan(wpa_s, &params, interval);
2049         os_free(params.filter_ssids);
2050         if (ret == 0)
2051                 wpa_s->pno = 1;
2052         else
2053                 wpa_msg(wpa_s, MSG_ERROR, "Failed to schedule PNO");
2054         return ret;
2055 }
2056
2057
2058 int wpas_stop_pno(struct wpa_supplicant *wpa_s)
2059 {
2060         int ret = 0;
2061
2062         if (!wpa_s->pno)
2063                 return 0;
2064
2065         ret = wpa_supplicant_stop_sched_scan(wpa_s);
2066
2067         wpa_s->pno = 0;
2068         wpa_s->pno_sched_pending = 0;
2069
2070         if (wpa_s->wpa_state == WPA_SCANNING)
2071                 wpa_supplicant_req_scan(wpa_s, 0, 0);
2072
2073         return ret;
2074 }