wpa_supplicant/scan.c

   1 /*
   2  * WPA Supplicant - Scanning
   3  * Copyright (c) 2003-2014, Jouni Malinen <j@w1.fi>
   4  *
   5  * This software may be distributed under the terms of the BSD license.
   6  * See README for more details.
   7  */
   8
   9 #include "utils/includes.h"
  10
  11 #include "utils/common.h"
  12 #include "utils/eloop.h"
  13 #include "common/ieee802_11_defs.h"
  14 #include "common/wpa_ctrl.h"
  15 #include "config.h"
  16 #include "wpa_supplicant_i.h"
  17 #include "driver_i.h"
  18 #include "wps_supplicant.h"
  19 #include "p2p_supplicant.h"
  20 #include "p2p/p2p.h"
  21 #include "hs20_supplicant.h"
  22 #include "notify.h"
  23 #include "bss.h"
  24 #include "scan.h"
  25
  26
  27 static void wpa_supplicant_gen_assoc_event(struct wpa_supplicant *wpa_s)
  28 {
  29         struct wpa_ssid *ssid;
  30         union wpa_event_data data;
  31
  32         ssid = wpa_supplicant_get_ssid(wpa_s);
  33         if (ssid == NULL)
  34                 return;
  35
  36         if (wpa_s->current_ssid == NULL) {
  37                 wpa_s->current_ssid = ssid;
  38                 if (wpa_s->current_ssid != NULL)
  39                         wpas_notify_network_changed(wpa_s);
  40         }
  41         wpa_supplicant_initiate_eapol(wpa_s);
  42         wpa_dbg(wpa_s, MSG_DEBUG, "Already associated with a configured "
  43                 "network - generating associated event");
  44         os_memset(&data, 0, sizeof(data));
  45         wpa_supplicant_event(wpa_s, EVENT_ASSOC, &data);
  46 }
  47
  48
  49 #ifdef CONFIG_WPS
  50 static int wpas_wps_in_use(struct wpa_supplicant *wpa_s,
  51                            enum wps_request_type *req_type)
  52 {
  53         struct wpa_ssid *ssid;
  54         int wps = 0;
  55
  56         for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
  57                 if (!(ssid->key_mgmt & WPA_KEY_MGMT_WPS))
  58                         continue;
  59
  60                 wps = 1;
  61                 *req_type = wpas_wps_get_req_type(ssid);
  62                 if (!ssid->eap.phase1)
  63                         continue;
  64
  65                 if (os_strstr(ssid->eap.phase1, "pbc=1"))
  66                         return 2;
  67         }
  68
  69 #ifdef CONFIG_P2P
  70         if (!wpa_s->global->p2p_disabled && wpa_s->global->p2p &&
  71             !wpa_s->conf->p2p_disabled) {
  72                 wpa_s->wps->dev.p2p = 1;
  73                 if (!wps) {
  74                         wps = 1;
  75                         *req_type = WPS_REQ_ENROLLEE_INFO;
  76                 }
  77         }
  78 #endif /* CONFIG_P2P */
  79
  80         return wps;
  81 }
  82 #endif /* CONFIG_WPS */
  83
  84
  85 /**
  86  * wpa_supplicant_enabled_networks - Check whether there are enabled networks
  87  * @wpa_s: Pointer to wpa_supplicant data
  88  * Returns: 0 if no networks are enabled, >0 if networks are enabled
  89  *
  90  * This function is used to figure out whether any networks (or Interworking
  91  * with enabled credentials and auto_interworking) are present in the current
  92  * configuration.
  93  */
  94 int wpa_supplicant_enabled_networks(struct wpa_supplicant *wpa_s)
  95 {
  96         struct wpa_ssid *ssid = wpa_s->conf->ssid;
  97         int count = 0, disabled = 0;
  98         while (ssid) {
  99                 if (!wpas_network_disabled(wpa_s, ssid))
 100                         count++;
 101                 else
 102                         disabled++;
 103                 ssid = ssid->next;
 104         }
 105         if (wpa_s->conf->cred && wpa_s->conf->interworking &&
 106             wpa_s->conf->auto_interworking)
 107                 count++;
 108         if (count == 0 && disabled > 0) {
 109                 wpa_dbg(wpa_s, MSG_DEBUG, "No enabled networks (%d disabled "
 110                         "networks)", disabled);
 111         }
 112         return count;
 113 }
 114
 115
 116 static void wpa_supplicant_assoc_try(struct wpa_supplicant *wpa_s,
 117                                      struct wpa_ssid *ssid)
 118 {
 119         while (ssid) {
 120                 if (!wpas_network_disabled(wpa_s, ssid))
 121                         break;
 122                 ssid = ssid->next;
 123         }
 124
 125         /* ap_scan=2 mode - try to associate with each SSID. */
 126         if (ssid == NULL) {
 127                 wpa_dbg(wpa_s, MSG_DEBUG, "wpa_supplicant_assoc_try: Reached "
 128                         "end of scan list - go back to beginning");
 129                 wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
 130                 wpa_supplicant_req_scan(wpa_s, 0, 0);
 131                 return;
 132         }
 133         if (ssid->next) {
 134                 /* Continue from the next SSID on the next attempt. */
 135                 wpa_s->prev_scan_ssid = ssid;
 136         } else {
 137                 /* Start from the beginning of the SSID list. */
 138                 wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
 139         }
 140         wpa_supplicant_associate(wpa_s, NULL, ssid);
 141 }
 142
 143
 144 static void wpas_trigger_scan_cb(struct wpa_radio_work *work, int deinit)
 145 {
 146         struct wpa_supplicant *wpa_s = work->wpa_s;
 147         struct wpa_driver_scan_params *params = work->ctx;
 148         int ret;
 149
 150         if (deinit) {
 151                 if (!work->started) {
 152                         wpa_scan_free_params(params);
 153                         return;
 154                 }
 155                 wpa_supplicant_notify_scanning(wpa_s, 0);
 156                 wpas_notify_scan_done(wpa_s, 0);
 157                 wpa_s->scan_work = NULL;
 158                 return;
 159         }
 160
 161         wpa_supplicant_notify_scanning(wpa_s, 1);
 162
 163         if (wpa_s->clear_driver_scan_cache)
 164                 params->only_new_results = 1;
 165         ret = wpa_drv_scan(wpa_s, params);
 166         wpa_scan_free_params(params);
 167         work->ctx = NULL;
 168         if (ret) {
 169                 wpa_supplicant_notify_scanning(wpa_s, 0);
 170                 wpas_notify_scan_done(wpa_s, 0);
 171                 radio_work_done(work);
 172                 return;
 173         }
 174
 175         os_get_reltime(&wpa_s->scan_trigger_time);
 176         wpa_s->scan_runs++;
 177         wpa_s->normal_scans++;
 178         wpa_s->own_scan_requested = 1;
 179         wpa_s->clear_driver_scan_cache = 0;
 180         wpa_s->scan_work = work;
 181 }
 182
 183
 184 /**
 185  * wpa_supplicant_trigger_scan - Request driver to start a scan
 186  * @wpa_s: Pointer to wpa_supplicant data
 187  * @params: Scan parameters
 188  * Returns: 0 on success, -1 on failure
 189  */
 190 int wpa_supplicant_trigger_scan(struct wpa_supplicant *wpa_s,
 191                                 struct wpa_driver_scan_params *params)
 192 {
 193         struct wpa_driver_scan_params *ctx;
 194
 195         if (wpa_s->scan_work) {
 196                 wpa_dbg(wpa_s, MSG_INFO, "Reject scan trigger since one is already pending");
 197                 return -1;
 198         }
 199
 200         ctx = wpa_scan_clone_params(params);
 201         if (ctx == NULL)
 202                 return -1;
 203
 204         if (radio_add_work(wpa_s, 0, "scan", 0, wpas_trigger_scan_cb, ctx) < 0)
 205         {
 206                 wpa_scan_free_params(ctx);
 207                 return -1;
 208         }
 209
 210         return 0;
 211 }
 212
 213
 214 static void
 215 wpa_supplicant_delayed_sched_scan_timeout(void *eloop_ctx, void *timeout_ctx)
 216 {
 217         struct wpa_supplicant *wpa_s = eloop_ctx;
 218
 219         wpa_dbg(wpa_s, MSG_DEBUG, "Starting delayed sched scan");
 220
 221         if (wpa_supplicant_req_sched_scan(wpa_s))
 222                 wpa_supplicant_req_scan(wpa_s, 0, 0);
 223 }
 224
 225
 226 static void
 227 wpa_supplicant_sched_scan_timeout(void *eloop_ctx, void *timeout_ctx)
 228 {
 229         struct wpa_supplicant *wpa_s = eloop_ctx;
 230
 231         wpa_dbg(wpa_s, MSG_DEBUG, "Sched scan timeout - stopping it");
 232
 233         wpa_s->sched_scan_timed_out = 1;
 234         wpa_supplicant_cancel_sched_scan(wpa_s);
 235 }
 236
 237
 238 int wpa_supplicant_start_sched_scan(struct wpa_supplicant *wpa_s,
 239                                     struct wpa_driver_scan_params *params,
 240                                     int interval)
 241 {
 242         int ret;
 243
 244         wpa_supplicant_notify_scanning(wpa_s, 1);
 245         ret = wpa_drv_sched_scan(wpa_s, params, interval * 1000);
 246         if (ret)
 247                 wpa_supplicant_notify_scanning(wpa_s, 0);
 248         else
 249                 wpa_s->sched_scanning = 1;
 250
 251         return ret;
 252 }
 253
 254
 255 int wpa_supplicant_stop_sched_scan(struct wpa_supplicant *wpa_s)
 256 {
 257         int ret;
 258
 259         ret = wpa_drv_stop_sched_scan(wpa_s);
 260         if (ret) {
 261                 wpa_dbg(wpa_s, MSG_DEBUG, "stopping sched_scan failed!");
 262                 /* TODO: what to do if stopping fails? */
 263                 return -1;
 264         }
 265
 266         return ret;
 267 }
 268
 269
 270 static struct wpa_driver_scan_filter *
 271 wpa_supplicant_build_filter_ssids(struct wpa_config *conf, size_t *num_ssids)
 272 {
 273         struct wpa_driver_scan_filter *ssids;
 274         struct wpa_ssid *ssid;
 275         size_t count;
 276
 277         *num_ssids = 0;
 278         if (!conf->filter_ssids)
 279                 return NULL;
 280
 281         for (count = 0, ssid = conf->ssid; ssid; ssid = ssid->next) {
 282                 if (ssid->ssid && ssid->ssid_len)
 283                         count++;
 284         }
 285         if (count == 0)
 286                 return NULL;
 287         ssids = os_zalloc(count * sizeof(struct wpa_driver_scan_filter));
 288         if (ssids == NULL)
 289                 return NULL;
 290
 291         for (ssid = conf->ssid; ssid; ssid = ssid->next) {
 292                 if (!ssid->ssid || !ssid->ssid_len)
 293                         continue;
 294                 os_memcpy(ssids[*num_ssids].ssid, ssid->ssid, ssid->ssid_len);
 295                 ssids[*num_ssids].ssid_len = ssid->ssid_len;
 296                 (*num_ssids)++;
 297         }
 298
 299         return ssids;
 300 }
 301
 302
 303 static void wpa_supplicant_optimize_freqs(
 304         struct wpa_supplicant *wpa_s, struct wpa_driver_scan_params *params)
 305 {
 306 #ifdef CONFIG_P2P
 307         if (params->freqs == NULL && wpa_s->p2p_in_provisioning &&
 308             wpa_s->go_params) {
 309                 /* Optimize provisioning state scan based on GO information */
 310                 if (wpa_s->p2p_in_provisioning < 5 &&
 311                     wpa_s->go_params->freq > 0) {
 312                         wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only GO "
 313                                 "preferred frequency %d MHz",
 314                                 wpa_s->go_params->freq);
 315                         params->freqs = os_zalloc(2 * sizeof(int));
 316                         if (params->freqs)
 317                                 params->freqs[0] = wpa_s->go_params->freq;
 318                 } else if (wpa_s->p2p_in_provisioning < 8 &&
 319                            wpa_s->go_params->freq_list[0]) {
 320                         wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only common "
 321                                 "channels");
 322                         int_array_concat(&params->freqs,
 323                                          wpa_s->go_params->freq_list);
 324                         if (params->freqs)
 325                                 int_array_sort_unique(params->freqs);
 326                 }
 327                 wpa_s->p2p_in_provisioning++;
 328         }
 329
 330         if (params->freqs == NULL && wpa_s->p2p_in_invitation) {
 331                 /*
 332                  * Optimize scan based on GO information during persistent
 333                  * group reinvocation
 334                  */
 335                 if (wpa_s->p2p_in_invitation < 5 &&
 336                     wpa_s->p2p_invite_go_freq > 0) {
 337                         wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only GO preferred frequency %d MHz during invitation",
 338                                 wpa_s->p2p_invite_go_freq);
 339                         params->freqs = os_zalloc(2 * sizeof(int));
 340                         if (params->freqs)
 341                                 params->freqs[0] = wpa_s->p2p_invite_go_freq;
 342                 }
 343                 wpa_s->p2p_in_invitation++;
 344                 if (wpa_s->p2p_in_invitation > 20) {
 345                         /*
 346                          * This should not really happen since the variable is
 347                          * cleared on group removal, but if it does happen, make
 348                          * sure we do not get stuck in special invitation scan
 349                          * mode.
 350                          */
 351                         wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Clear p2p_in_invitation");
 352                         wpa_s->p2p_in_invitation = 0;
 353                 }
 354         }
 355 #endif /* CONFIG_P2P */
 356
 357 #ifdef CONFIG_WPS
 358         if (params->freqs == NULL && wpa_s->after_wps && wpa_s->wps_freq) {
 359                 /*
 360                  * Optimize post-provisioning scan based on channel used
 361                  * during provisioning.
 362                  */
 363                 wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Scan only frequency %u MHz "
 364                         "that was used during provisioning", wpa_s->wps_freq);
 365                 params->freqs = os_zalloc(2 * sizeof(int));
 366                 if (params->freqs)
 367                         params->freqs[0] = wpa_s->wps_freq;
 368                 wpa_s->after_wps--;
 369         } else if (wpa_s->after_wps)
 370                 wpa_s->after_wps--;
 371
 372         if (params->freqs == NULL && wpa_s->known_wps_freq && wpa_s->wps_freq)
 373         {
 374                 /* Optimize provisioning scan based on already known channel */
 375                 wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Scan only frequency %u MHz",
 376                         wpa_s->wps_freq);
 377                 params->freqs = os_zalloc(2 * sizeof(int));
 378                 if (params->freqs)
 379                         params->freqs[0] = wpa_s->wps_freq;
 380                 wpa_s->known_wps_freq = 0; /* only do this once */
 381         }
 382 #endif /* CONFIG_WPS */
 383 }
 384
 385
 386 #ifdef CONFIG_INTERWORKING
 387 static void wpas_add_interworking_elements(struct wpa_supplicant *wpa_s,
 388                                            struct wpabuf *buf)
 389 {
 390         if (wpa_s->conf->interworking == 0)
 391                 return;
 392
 393         wpabuf_put_u8(buf, WLAN_EID_EXT_CAPAB);
 394         wpabuf_put_u8(buf, 6);
 395         wpabuf_put_u8(buf, 0x00);
 396         wpabuf_put_u8(buf, 0x00);
 397         wpabuf_put_u8(buf, 0x00);
 398         wpabuf_put_u8(buf, 0x80); /* Bit 31 - Interworking */
 399         wpabuf_put_u8(buf, 0x00);
 400 #ifdef CONFIG_HS20
 401         wpabuf_put_u8(buf, 0x40); /* Bit 46 - WNM-Notification */
 402 #else /* CONFIG_HS20 */
 403         wpabuf_put_u8(buf, 0x00);
 404 #endif /* CONFIG_HS20 */
 405
 406         wpabuf_put_u8(buf, WLAN_EID_INTERWORKING);
 407         wpabuf_put_u8(buf, is_zero_ether_addr(wpa_s->conf->hessid) ? 1 :
 408                       1 + ETH_ALEN);
 409         wpabuf_put_u8(buf, wpa_s->conf->access_network_type);
 410         /* No Venue Info */
 411         if (!is_zero_ether_addr(wpa_s->conf->hessid))
 412                 wpabuf_put_data(buf, wpa_s->conf->hessid, ETH_ALEN);
 413 }
 414 #endif /* CONFIG_INTERWORKING */
 415
 416
 417 static struct wpabuf * wpa_supplicant_extra_ies(struct wpa_supplicant *wpa_s)
 418 {
 419         struct wpabuf *extra_ie = NULL;
 420 #ifdef CONFIG_WPS
 421         int wps = 0;
 422         enum wps_request_type req_type = WPS_REQ_ENROLLEE_INFO;
 423 #endif /* CONFIG_WPS */
 424
 425 #ifdef CONFIG_INTERWORKING
 426         if (wpa_s->conf->interworking &&
 427             wpabuf_resize(&extra_ie, 100) == 0)
 428                 wpas_add_interworking_elements(wpa_s, extra_ie);
 429 #endif /* CONFIG_INTERWORKING */
 430
 431 #ifdef CONFIG_WPS
 432         wps = wpas_wps_in_use(wpa_s, &req_type);
 433
 434         if (wps) {
 435                 struct wpabuf *wps_ie;
 436                 wps_ie = wps_build_probe_req_ie(wps == 2 ? DEV_PW_PUSHBUTTON :
 437                                                 DEV_PW_DEFAULT,
 438                                                 &wpa_s->wps->dev,
 439                                                 wpa_s->wps->uuid, req_type,
 440                                                 0, NULL);
 441                 if (wps_ie) {
 442                         if (wpabuf_resize(&extra_ie, wpabuf_len(wps_ie)) == 0)
 443                                 wpabuf_put_buf(extra_ie, wps_ie);
 444                         wpabuf_free(wps_ie);
 445                 }
 446         }
 447
 448 #ifdef CONFIG_P2P
 449         if (wps) {
 450                 size_t ielen = p2p_scan_ie_buf_len(wpa_s->global->p2p);
 451                 if (wpabuf_resize(&extra_ie, ielen) == 0)
 452                         wpas_p2p_scan_ie(wpa_s, extra_ie);
 453         }
 454 #endif /* CONFIG_P2P */
 455
 456 #endif /* CONFIG_WPS */
 457
 458 #ifdef CONFIG_HS20
 459         if (wpa_s->conf->hs20 && wpabuf_resize(&extra_ie, 7) == 0)
 460                 wpas_hs20_add_indication(extra_ie, -1);
 461 #endif /* CONFIG_HS20 */
 462
 463         return extra_ie;
 464 }
 465
 466
 467 #ifdef CONFIG_P2P
 468
 469 /*
 470  * Check whether there are any enabled networks or credentials that could be
 471  * used for a non-P2P connection.
 472  */
 473 static int non_p2p_network_enabled(struct wpa_supplicant *wpa_s)
 474 {
 475         struct wpa_ssid *ssid;
 476
 477         for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
 478                 if (wpas_network_disabled(wpa_s, ssid))
 479                         continue;
 480                 if (!ssid->p2p_group)
 481                         return 1;
 482         }
 483
 484         if (wpa_s->conf->cred && wpa_s->conf->interworking &&
 485             wpa_s->conf->auto_interworking)
 486                 return 1;
 487
 488         return 0;
 489 }
 490
 491 #endif /* CONFIG_P2P */
 492
 493
 494 static struct hostapd_hw_modes * get_mode(struct hostapd_hw_modes *modes,
 495                                           u16 num_modes,
 496                                           enum hostapd_hw_mode mode)
 497 {
 498         u16 i;
 499
 500         for (i = 0; i < num_modes; i++) {
 501                 if (modes[i].mode == mode)
 502                         return &modes[i];
 503         }
 504
 505         return NULL;
 506 }
 507
 508
 509 static void wpa_setband_scan_freqs_list(struct wpa_supplicant *wpa_s,
 510                                         enum hostapd_hw_mode band,
 511                                         struct wpa_driver_scan_params *params)
 512 {
 513         /* Include only supported channels for the specified band */
 514         struct hostapd_hw_modes *mode;
 515         int count, i;
 516
 517         mode = get_mode(wpa_s->hw.modes, wpa_s->hw.num_modes, band);
 518         if (mode == NULL) {
 519                 /* No channels supported in this band - use empty list */
 520                 params->freqs = os_zalloc(sizeof(int));
 521                 return;
 522         }
 523
 524         params->freqs = os_zalloc((mode->num_channels + 1) * sizeof(int));
 525         if (params->freqs == NULL)
 526                 return;
 527         for (count = 0, i = 0; i < mode->num_channels; i++) {
 528                 if (mode->channels[i].flag & HOSTAPD_CHAN_DISABLED)
 529                         continue;
 530                 params->freqs[count++] = mode->channels[i].freq;
 531         }
 532 }
 533
 534
 535 static void wpa_setband_scan_freqs(struct wpa_supplicant *wpa_s,
 536                                    struct wpa_driver_scan_params *params)
 537 {
 538         if (wpa_s->hw.modes == NULL)
 539                 return; /* unknown what channels the driver supports */
 540         if (params->freqs)
 541                 return; /* already using a limited channel set */
 542         if (wpa_s->setband == WPA_SETBAND_5G)
 543                 wpa_setband_scan_freqs_list(wpa_s, HOSTAPD_MODE_IEEE80211A,
 544                                             params);
 545         else if (wpa_s->setband == WPA_SETBAND_2G)
 546                 wpa_setband_scan_freqs_list(wpa_s, HOSTAPD_MODE_IEEE80211G,
 547                                             params);
 548 }
 549
 550
 551 static void wpa_supplicant_scan(void *eloop_ctx, void *timeout_ctx)
 552 {
 553         struct wpa_supplicant *wpa_s = eloop_ctx;
 554         struct wpa_ssid *ssid;
 555         int ret;
 556         struct wpabuf *extra_ie = NULL;
 557         struct wpa_driver_scan_params params;
 558         struct wpa_driver_scan_params *scan_params;
 559         size_t max_ssids;
 560         enum wpa_states prev_state;
 561
 562         if (wpa_s->pno || wpa_s->pno_sched_pending) {
 563                 wpa_dbg(wpa_s, MSG_DEBUG, "Skip scan - PNO is in progress");
 564                 return;
 565         }
 566
 567         if (wpa_s->wpa_state == WPA_INTERFACE_DISABLED) {
 568                 wpa_dbg(wpa_s, MSG_DEBUG, "Skip scan - interface disabled");
 569                 return;
 570         }
 571
 572         if (wpa_s->disconnected && wpa_s->scan_req == NORMAL_SCAN_REQ) {
 573                 wpa_dbg(wpa_s, MSG_DEBUG, "Disconnected - do not scan");
 574                 wpa_supplicant_set_state(wpa_s, WPA_DISCONNECTED);
 575                 return;
 576         }
 577
 578         if (wpa_s->scanning) {
 579                 /*
 580                  * If we are already in scanning state, we shall reschedule the
 581                  * the incoming scan request.
 582                  */
 583                 wpa_dbg(wpa_s, MSG_DEBUG, "Already scanning - Reschedule the incoming scan req");
 584                 wpa_supplicant_req_scan(wpa_s, 1, 0);
 585                 return;
 586         }
 587
 588         if (!wpa_supplicant_enabled_networks(wpa_s) &&
 589             wpa_s->scan_req == NORMAL_SCAN_REQ) {
 590                 wpa_dbg(wpa_s, MSG_DEBUG, "No enabled networks - do not scan");
 591                 wpa_supplicant_set_state(wpa_s, WPA_INACTIVE);
 592                 return;
 593         }
 594
 595         if (wpa_s->conf->ap_scan != 0 &&
 596             (wpa_s->drv_flags & WPA_DRIVER_FLAGS_WIRED)) {
 597                 wpa_dbg(wpa_s, MSG_DEBUG, "Using wired authentication - "
 598                         "overriding ap_scan configuration");
 599                 wpa_s->conf->ap_scan = 0;
 600                 wpas_notify_ap_scan_changed(wpa_s);
 601         }
 602
 603         if (wpa_s->conf->ap_scan == 0) {
 604                 wpa_supplicant_gen_assoc_event(wpa_s);
 605                 return;
 606         }
 607
 608         if (wpas_p2p_in_progress(wpa_s)) {
 609                 wpa_dbg(wpa_s, MSG_DEBUG, "Delay station mode scan while P2P operation is in progress");
 610                 wpa_supplicant_req_scan(wpa_s, 5, 0);
 611                 return;
 612         }
 613
 614         if (wpa_s->conf->ap_scan == 2)
 615                 max_ssids = 1;
 616         else {
 617                 max_ssids = wpa_s->max_scan_ssids;
 618                 if (max_ssids > WPAS_MAX_SCAN_SSIDS)
 619                         max_ssids = WPAS_MAX_SCAN_SSIDS;
 620         }
 621
 622         wpa_s->last_scan_req = wpa_s->scan_req;
 623         wpa_s->scan_req = NORMAL_SCAN_REQ;
 624
 625         os_memset(&params, 0, sizeof(params));
 626
 627         prev_state = wpa_s->wpa_state;
 628         if (wpa_s->wpa_state == WPA_DISCONNECTED ||
 629             wpa_s->wpa_state == WPA_INACTIVE)
 630                 wpa_supplicant_set_state(wpa_s, WPA_SCANNING);
 631
 632         /*
 633          * If autoscan has set its own scanning parameters
 634          */
 635         if (wpa_s->autoscan_params != NULL) {
 636                 scan_params = wpa_s->autoscan_params;
 637                 goto scan;
 638         }
 639
 640         if (wpa_s->last_scan_req != MANUAL_SCAN_REQ &&
 641             wpa_s->connect_without_scan) {
 642                 for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
 643                         if (ssid == wpa_s->connect_without_scan)
 644                                 break;
 645                 }
 646                 wpa_s->connect_without_scan = NULL;
 647                 if (ssid) {
 648                         wpa_printf(MSG_DEBUG, "Start a pre-selected network "
 649                                    "without scan step");
 650                         wpa_supplicant_associate(wpa_s, NULL, ssid);
 651                         return;
 652                 }
 653         }
 654
 655 #ifdef CONFIG_P2P
 656         if ((wpa_s->p2p_in_provisioning || wpa_s->show_group_started) &&
 657             wpa_s->go_params) {
 658                 wpa_printf(MSG_DEBUG, "P2P: Use specific SSID for scan during P2P group formation (p2p_in_provisioning=%d show_group_started=%d)",
 659                            wpa_s->p2p_in_provisioning,
 660                            wpa_s->show_group_started);
 661                 params.ssids[0].ssid = wpa_s->go_params->ssid;
 662                 params.ssids[0].ssid_len = wpa_s->go_params->ssid_len;
 663                 params.num_ssids = 1;
 664                 goto ssid_list_set;
 665         }
 666
 667         if (wpa_s->p2p_in_invitation) {
 668                 if (wpa_s->current_ssid) {
 669                         wpa_printf(MSG_DEBUG, "P2P: Use specific SSID for scan during invitation");
 670                         params.ssids[0].ssid = wpa_s->current_ssid->ssid;
 671                         params.ssids[0].ssid_len =
 672                                 wpa_s->current_ssid->ssid_len;
 673                         params.num_ssids = 1;
 674                 } else {
 675                         wpa_printf(MSG_DEBUG, "P2P: No specific SSID known for scan during invitation");
 676                 }
 677                 goto ssid_list_set;
 678         }
 679 #endif /* CONFIG_P2P */
 680
 681         /* Find the starting point from which to continue scanning */
 682         ssid = wpa_s->conf->ssid;
 683         if (wpa_s->prev_scan_ssid != WILDCARD_SSID_SCAN) {
 684                 while (ssid) {
 685                         if (ssid == wpa_s->prev_scan_ssid) {
 686                                 ssid = ssid->next;
 687                                 break;
 688                         }
 689                         ssid = ssid->next;
 690                 }
 691         }
 692
 693         if (wpa_s->last_scan_req != MANUAL_SCAN_REQ &&
 694             wpa_s->conf->ap_scan == 2) {
 695                 wpa_s->connect_without_scan = NULL;
 696                 wpa_s->prev_scan_wildcard = 0;
 697                 wpa_supplicant_assoc_try(wpa_s, ssid);
 698                 return;
 699         } else if (wpa_s->conf->ap_scan == 2) {
 700                 /*
 701                  * User-initiated scan request in ap_scan == 2; scan with
 702                  * wildcard SSID.
 703                  */
 704                 ssid = NULL;
 705         } else if (wpa_s->reattach && wpa_s->current_ssid != NULL) {
 706                 /*
 707                  * Perform single-channel single-SSID scan for
 708                  * reassociate-to-same-BSS operation.
 709                  */
 710                 /* Setup SSID */
 711                 ssid = wpa_s->current_ssid;
 712                 wpa_hexdump_ascii(MSG_DEBUG, "Scan SSID",
 713                                   ssid->ssid, ssid->ssid_len);
 714                 params.ssids[0].ssid = ssid->ssid;
 715                 params.ssids[0].ssid_len = ssid->ssid_len;
 716                 params.num_ssids = 1;
 717
 718                 /*
 719                  * Allocate memory for frequency array, allocate one extra
 720                  * slot for the zero-terminator.
 721                  */
 722                 params.freqs = os_malloc(sizeof(int) * 2);
 723                 if (params.freqs == NULL) {
 724                         wpa_dbg(wpa_s, MSG_ERROR, "Memory allocation failed");
 725                         return;
 726                 }
 727                 params.freqs[0] = wpa_s->assoc_freq;
 728                 params.freqs[1] = 0;
 729
 730                 /*
 731                  * Reset the reattach flag so that we fall back to full scan if
 732                  * this scan fails.
 733                  */
 734                 wpa_s->reattach = 0;
 735         } else {
 736                 struct wpa_ssid *start = ssid, *tssid;
 737                 int freqs_set = 0;
 738                 if (ssid == NULL && max_ssids > 1)
 739                         ssid = wpa_s->conf->ssid;
 740                 while (ssid) {
 741                         if (!wpas_network_disabled(wpa_s, ssid) &&
 742                             ssid->scan_ssid) {
 743                                 wpa_hexdump_ascii(MSG_DEBUG, "Scan SSID",
 744                                                   ssid->ssid, ssid->ssid_len);
 745                                 params.ssids[params.num_ssids].ssid =
 746                                         ssid->ssid;
 747                                 params.ssids[params.num_ssids].ssid_len =
 748                                         ssid->ssid_len;
 749                                 params.num_ssids++;
 750                                 if (params.num_ssids + 1 >= max_ssids)
 751                                         break;
 752                         }
 753                         ssid = ssid->next;
 754                         if (ssid == start)
 755                                 break;
 756                         if (ssid == NULL && max_ssids > 1 &&
 757                             start != wpa_s->conf->ssid)
 758                                 ssid = wpa_s->conf->ssid;
 759                 }
 760
 761                 for (tssid = wpa_s->conf->ssid; tssid; tssid = tssid->next) {
 762                         if (wpas_network_disabled(wpa_s, tssid))
 763                                 continue;
 764                         if ((params.freqs || !freqs_set) && tssid->scan_freq) {
 765                                 int_array_concat(&params.freqs,
 766                                                  tssid->scan_freq);
 767                         } else {
 768                                 os_free(params.freqs);
 769                                 params.freqs = NULL;
 770                         }
 771                         freqs_set = 1;
 772                 }
 773                 int_array_sort_unique(params.freqs);
 774         }
 775
 776         if (ssid && max_ssids == 1) {
 777                 /*
 778                  * If the driver is limited to 1 SSID at a time interleave
 779                  * wildcard SSID scans with specific SSID scans to avoid
 780                  * waiting a long time for a wildcard scan.
 781                  */
 782                 if (!wpa_s->prev_scan_wildcard) {
 783                         params.ssids[0].ssid = NULL;
 784                         params.ssids[0].ssid_len = 0;
 785                         wpa_s->prev_scan_wildcard = 1;
 786                         wpa_dbg(wpa_s, MSG_DEBUG, "Starting AP scan for "
 787                                 "wildcard SSID (Interleave with specific)");
 788                 } else {
 789                         wpa_s->prev_scan_ssid = ssid;
 790                         wpa_s->prev_scan_wildcard = 0;
 791                         wpa_dbg(wpa_s, MSG_DEBUG,
 792                                 "Starting AP scan for specific SSID: %s",
 793                                 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
 794                 }
 795         } else if (ssid) {
 796                 /* max_ssids > 1 */
 797
 798                 wpa_s->prev_scan_ssid = ssid;
 799                 wpa_dbg(wpa_s, MSG_DEBUG, "Include wildcard SSID in "
 800                         "the scan request");
 801                 params.num_ssids++;
 802         } else if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
 803                    wpa_s->manual_scan_passive && params.num_ssids == 0) {
 804                 wpa_dbg(wpa_s, MSG_DEBUG, "Use passive scan based on manual request");
 805         } else {
 806                 wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
 807                 params.num_ssids++;
 808                 wpa_dbg(wpa_s, MSG_DEBUG, "Starting AP scan for wildcard "
 809                         "SSID");
 810         }
 811 #ifdef CONFIG_P2P
 812 ssid_list_set:
 813 #endif /* CONFIG_P2P */
 814
 815         wpa_supplicant_optimize_freqs(wpa_s, &params);
 816         extra_ie = wpa_supplicant_extra_ies(wpa_s);
 817
 818         if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
 819             wpa_s->manual_scan_only_new)
 820                 params.only_new_results = 1;
 821
 822         if (wpa_s->last_scan_req == MANUAL_SCAN_REQ && params.freqs == NULL &&
 823             wpa_s->manual_scan_freqs) {
 824                 wpa_dbg(wpa_s, MSG_DEBUG, "Limit manual scan to specified channels");
 825                 params.freqs = wpa_s->manual_scan_freqs;
 826                 wpa_s->manual_scan_freqs = NULL;
 827         }
 828
 829         if (params.freqs == NULL && wpa_s->next_scan_freqs) {
 830                 wpa_dbg(wpa_s, MSG_DEBUG, "Optimize scan based on previously "
 831                         "generated frequency list");
 832                 params.freqs = wpa_s->next_scan_freqs;
 833         } else
 834                 os_free(wpa_s->next_scan_freqs);
 835         wpa_s->next_scan_freqs = NULL;
 836         wpa_setband_scan_freqs(wpa_s, &params);
 837
 838         /* See if user specified frequencies. If so, scan only those. */
 839         if (wpa_s->conf->freq_list && !params.freqs) {
 840                 wpa_dbg(wpa_s, MSG_DEBUG,
 841                         "Optimize scan based on conf->freq_list");
 842                 int_array_concat(&params.freqs, wpa_s->conf->freq_list);
 843         }
 844
 845         /* Use current associated channel? */
 846         if (wpa_s->conf->scan_cur_freq && !params.freqs) {
 847                 unsigned int num = wpa_s->num_multichan_concurrent;
 848
 849                 params.freqs = os_calloc(num + 1, sizeof(int));
 850                 if (params.freqs) {
 851                         num = get_shared_radio_freqs(wpa_s, params.freqs, num);
 852                         if (num > 0) {
 853                                 wpa_dbg(wpa_s, MSG_DEBUG, "Scan only the "
 854                                         "current operating channels since "
 855                                         "scan_cur_freq is enabled");
 856                         } else {
 857                                 os_free(params.freqs);
 858                                 params.freqs = NULL;
 859                         }
 860                 }
 861         }
 862
 863         params.filter_ssids = wpa_supplicant_build_filter_ssids(
 864                 wpa_s->conf, &params.num_filter_ssids);
 865         if (extra_ie) {
 866                 params.extra_ies = wpabuf_head(extra_ie);
 867                 params.extra_ies_len = wpabuf_len(extra_ie);
 868         }
 869
 870 #ifdef CONFIG_P2P
 871         if (wpa_s->p2p_in_provisioning || wpa_s->p2p_in_invitation ||
 872             (wpa_s->show_group_started && wpa_s->go_params)) {
 873                 /*
 874                  * The interface may not yet be in P2P mode, so we have to
 875                  * explicitly request P2P probe to disable CCK rates.
 876                  */
 877                 params.p2p_probe = 1;
 878         }
 879 #endif /* CONFIG_P2P */
 880
 881         scan_params = &params;
 882
 883 scan:
 884 #ifdef CONFIG_P2P
 885         /*
 886          * If the driver does not support multi-channel concurrency and a
 887          * virtual interface that shares the same radio with the wpa_s interface
 888          * is operating there may not be need to scan other channels apart from
 889          * the current operating channel on the other virtual interface. Filter
 890          * out other channels in case we are trying to find a connection for a
 891          * station interface when we are not configured to prefer station
 892          * connection and a concurrent operation is already in process.
 893          */
 894         if (wpa_s->scan_for_connection &&
 895             wpa_s->last_scan_req == NORMAL_SCAN_REQ &&
 896             !scan_params->freqs && !params.freqs &&
 897             wpas_is_p2p_prioritized(wpa_s) &&
 898             wpa_s->p2p_group_interface == NOT_P2P_GROUP_INTERFACE &&
 899             non_p2p_network_enabled(wpa_s)) {
 900                 unsigned int num = wpa_s->num_multichan_concurrent;
 901
 902                 params.freqs = os_calloc(num + 1, sizeof(int));
 903                 if (params.freqs) {
 904                         num = get_shared_radio_freqs(wpa_s, params.freqs, num);
 905                         if (num > 0 && num == wpa_s->num_multichan_concurrent) {
 906                                 wpa_dbg(wpa_s, MSG_DEBUG, "Scan only the current operating channels since all channels are already used");
 907                         } else {
 908                                 os_free(params.freqs);
 909                                 params.freqs = NULL;
 910                         }
 911                 }
 912         }
 913 #endif /* CONFIG_P2P */
 914
 915         ret = wpa_supplicant_trigger_scan(wpa_s, scan_params);
 916
 917         if (ret && wpa_s->last_scan_req == MANUAL_SCAN_REQ && params.freqs &&
 918             !wpa_s->manual_scan_freqs) {
 919                 /* Restore manual_scan_freqs for the next attempt */
 920                 wpa_s->manual_scan_freqs = params.freqs;
 921                 params.freqs = NULL;
 922         }
 923
 924         wpabuf_free(extra_ie);
 925         os_free(params.freqs);
 926         os_free(params.filter_ssids);
 927
 928         if (ret) {
 929                 wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate AP scan");
 930                 if (prev_state != wpa_s->wpa_state)
 931                         wpa_supplicant_set_state(wpa_s, prev_state);
 932                 /* Restore scan_req since we will try to scan again */
 933                 wpa_s->scan_req = wpa_s->last_scan_req;
 934                 wpa_supplicant_req_scan(wpa_s, 1, 0);
 935         } else {
 936                 wpa_s->scan_for_connection = 0;
 937         }
 938 }
 939
 940
 941 void wpa_supplicant_update_scan_int(struct wpa_supplicant *wpa_s, int sec)
 942 {
 943         struct os_reltime remaining, new_int;
 944         int cancelled;
 945
 946         cancelled = eloop_cancel_timeout_one(wpa_supplicant_scan, wpa_s, NULL,
 947                                              &remaining);
 948
 949         new_int.sec = sec;
 950         new_int.usec = 0;
 951         if (cancelled && os_reltime_before(&remaining, &new_int)) {
 952                 new_int.sec = remaining.sec;
 953                 new_int.usec = remaining.usec;
 954         }
 955
 956         if (cancelled) {
 957                 eloop_register_timeout(new_int.sec, new_int.usec,
 958                                        wpa_supplicant_scan, wpa_s, NULL);
 959         }
 960         wpa_s->scan_interval = sec;
 961 }
 962
 963
 964 /**
 965  * wpa_supplicant_req_scan - Schedule a scan for neighboring access points
 966  * @wpa_s: Pointer to wpa_supplicant data
 967  * @sec: Number of seconds after which to scan
 968  * @usec: Number of microseconds after which to scan
 969  *
 970  * This function is used to schedule a scan for neighboring access points after
 971  * the specified time.
 972  */
 973 void wpa_supplicant_req_scan(struct wpa_supplicant *wpa_s, int sec, int usec)
 974 {
 975         int res = eloop_deplete_timeout(sec, usec, wpa_supplicant_scan, wpa_s,
 976                                         NULL);
 977         if (res == 1) {
 978                 wpa_dbg(wpa_s, MSG_DEBUG, "Rescheduling scan request: %d.%06d sec",
 979                         sec, usec);
 980         } else if (res == 0) {
 981                 wpa_dbg(wpa_s, MSG_DEBUG, "Ignore new scan request for %d.%06d sec since an earlier request is scheduled to trigger sooner",
 982                         sec, usec);
 983         } else {
 984                 wpa_dbg(wpa_s, MSG_DEBUG, "Setting scan request: %d.%06d sec",
 985                         sec, usec);
 986                 eloop_register_timeout(sec, usec, wpa_supplicant_scan, wpa_s, NULL);
 987         }
 988 }
 989
 990
 991 /**
 992  * wpa_supplicant_delayed_sched_scan - Request a delayed scheduled scan
 993  * @wpa_s: Pointer to wpa_supplicant data
 994  * @sec: Number of seconds after which to scan
 995  * @usec: Number of microseconds after which to scan
 996  * Returns: 0 on success or -1 otherwise
 997  *
 998  * This function is used to schedule periodic scans for neighboring
 999  * access points after the specified time.
1000  */
1001 int wpa_supplicant_delayed_sched_scan(struct wpa_supplicant *wpa_s,
1002                                       int sec, int usec)
1003 {
1004         if (!wpa_s->sched_scan_supported)
1005                 return -1;
1006
1007         eloop_register_timeout(sec, usec,
1008                                wpa_supplicant_delayed_sched_scan_timeout,
1009                                wpa_s, NULL);
1010
1011         return 0;
1012 }
1013
1014
1015 /**
1016  * wpa_supplicant_req_sched_scan - Start a periodic scheduled scan
1017  * @wpa_s: Pointer to wpa_supplicant data
1018  * Returns: 0 is sched_scan was started or -1 otherwise
1019  *
1020  * This function is used to schedule periodic scans for neighboring
1021  * access points repeating the scan continuously.
1022  */
1023 int wpa_supplicant_req_sched_scan(struct wpa_supplicant *wpa_s)
1024 {
1025         struct wpa_driver_scan_params params;
1026         struct wpa_driver_scan_params *scan_params;
1027         enum wpa_states prev_state;
1028         struct wpa_ssid *ssid = NULL;
1029         struct wpabuf *extra_ie = NULL;
1030         int ret;
1031         unsigned int max_sched_scan_ssids;
1032         int wildcard = 0;
1033         int need_ssids;
1034
1035         if (!wpa_s->sched_scan_supported)
1036                 return -1;
1037
1038         if (wpa_s->max_sched_scan_ssids > WPAS_MAX_SCAN_SSIDS)
1039                 max_sched_scan_ssids = WPAS_MAX_SCAN_SSIDS;
1040         else
1041                 max_sched_scan_ssids = wpa_s->max_sched_scan_ssids;
1042         if (max_sched_scan_ssids < 1 || wpa_s->conf->disable_scan_offload)
1043                 return -1;
1044
1045         if (wpa_s->sched_scanning) {
1046                 wpa_dbg(wpa_s, MSG_DEBUG, "Already sched scanning");
1047                 return 0;
1048         }
1049
1050         need_ssids = 0;
1051         for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
1052                 if (!wpas_network_disabled(wpa_s, ssid) && !ssid->scan_ssid) {
1053                         /* Use wildcard SSID to find this network */
1054                         wildcard = 1;
1055                 } else if (!wpas_network_disabled(wpa_s, ssid) &&
1056                            ssid->ssid_len)
1057                         need_ssids++;
1058
1059 #ifdef CONFIG_WPS
1060                 if (!wpas_network_disabled(wpa_s, ssid) &&
1061                     ssid->key_mgmt == WPA_KEY_MGMT_WPS) {
1062                         /*
1063                          * Normal scan is more reliable and faster for WPS
1064                          * operations and since these are for short periods of
1065                          * time, the benefit of trying to use sched_scan would
1066                          * be limited.
1067                          */
1068                         wpa_dbg(wpa_s, MSG_DEBUG, "Use normal scan instead of "
1069                                 "sched_scan for WPS");
1070                         return -1;
1071                 }
1072 #endif /* CONFIG_WPS */
1073         }
1074         if (wildcard)
1075                 need_ssids++;
1076
1077         if (wpa_s->normal_scans < 3 &&
1078             (need_ssids <= wpa_s->max_scan_ssids ||
1079              wpa_s->max_scan_ssids >= (int) max_sched_scan_ssids)) {
1080                 /*
1081                  * When normal scan can speed up operations, use that for the
1082                  * first operations before starting the sched_scan to allow
1083                  * user space sleep more. We do this only if the normal scan
1084                  * has functionality that is suitable for this or if the
1085                  * sched_scan does not have better support for multiple SSIDs.
1086                  */
1087                 wpa_dbg(wpa_s, MSG_DEBUG, "Use normal scan instead of "
1088                         "sched_scan for initial scans (normal_scans=%d)",
1089                         wpa_s->normal_scans);
1090                 return -1;
1091         }
1092
1093         os_memset(&params, 0, sizeof(params));
1094
1095         /* If we can't allocate space for the filters, we just don't filter */
1096         params.filter_ssids = os_zalloc(wpa_s->max_match_sets *
1097                                         sizeof(struct wpa_driver_scan_filter));
1098
1099         prev_state = wpa_s->wpa_state;
1100         if (wpa_s->wpa_state == WPA_DISCONNECTED ||
1101             wpa_s->wpa_state == WPA_INACTIVE)
1102                 wpa_supplicant_set_state(wpa_s, WPA_SCANNING);
1103
1104         if (wpa_s->autoscan_params != NULL) {
1105                 scan_params = wpa_s->autoscan_params;
1106                 goto scan;
1107         }
1108
1109         /* Find the starting point from which to continue scanning */
1110         ssid = wpa_s->conf->ssid;
1111         if (wpa_s->prev_sched_ssid) {
1112                 while (ssid) {
1113                         if (ssid == wpa_s->prev_sched_ssid) {
1114                                 ssid = ssid->next;
1115                                 break;
1116                         }
1117                         ssid = ssid->next;
1118                 }
1119         }
1120
1121         if (!ssid || !wpa_s->prev_sched_ssid) {
1122                 wpa_dbg(wpa_s, MSG_DEBUG, "Beginning of SSID list");
1123                 if (wpa_s->conf->sched_scan_interval)
1124                         wpa_s->sched_scan_interval =
1125                                 wpa_s->conf->sched_scan_interval;
1126                 if (wpa_s->sched_scan_interval == 0)
1127                         wpa_s->sched_scan_interval = 10;
1128                 wpa_s->sched_scan_timeout = max_sched_scan_ssids * 2;
1129                 wpa_s->first_sched_scan = 1;
1130                 ssid = wpa_s->conf->ssid;
1131                 wpa_s->prev_sched_ssid = ssid;
1132         }
1133
1134         if (wildcard) {
1135                 wpa_dbg(wpa_s, MSG_DEBUG, "Add wildcard SSID to sched_scan");
1136                 params.num_ssids++;
1137         }
1138
1139         while (ssid) {
1140                 if (wpas_network_disabled(wpa_s, ssid))
1141                         goto next;
1142
1143                 if (params.num_filter_ssids < wpa_s->max_match_sets &&
1144                     params.filter_ssids && ssid->ssid && ssid->ssid_len) {
1145                         wpa_dbg(wpa_s, MSG_DEBUG, "add to filter ssid: %s",
1146                                 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
1147                         os_memcpy(params.filter_ssids[params.num_filter_ssids].ssid,
1148                                   ssid->ssid, ssid->ssid_len);
1149                         params.filter_ssids[params.num_filter_ssids].ssid_len =
1150                                 ssid->ssid_len;
1151                         params.num_filter_ssids++;
1152                 } else if (params.filter_ssids && ssid->ssid && ssid->ssid_len)
1153                 {
1154                         wpa_dbg(wpa_s, MSG_DEBUG, "Not enough room for SSID "
1155                                 "filter for sched_scan - drop filter");
1156                         os_free(params.filter_ssids);
1157                         params.filter_ssids = NULL;
1158                         params.num_filter_ssids = 0;
1159                 }
1160
1161                 if (ssid->scan_ssid && ssid->ssid && ssid->ssid_len) {
1162                         if (params.num_ssids == max_sched_scan_ssids)
1163                                 break; /* only room for broadcast SSID */
1164                         wpa_dbg(wpa_s, MSG_DEBUG,
1165                                 "add to active scan ssid: %s",
1166                                 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
1167                         params.ssids[params.num_ssids].ssid =
1168                                 ssid->ssid;
1169                         params.ssids[params.num_ssids].ssid_len =
1170                                 ssid->ssid_len;
1171                         params.num_ssids++;
1172                         if (params.num_ssids >= max_sched_scan_ssids) {
1173                                 wpa_s->prev_sched_ssid = ssid;
1174                                 do {
1175                                         ssid = ssid->next;
1176                                 } while (ssid &&
1177                                          (wpas_network_disabled(wpa_s, ssid) ||
1178                                           !ssid->scan_ssid));
1179                                 break;
1180                         }
1181                 }
1182
1183         next:
1184                 wpa_s->prev_sched_ssid = ssid;
1185                 ssid = ssid->next;
1186         }
1187
1188         if (params.num_filter_ssids == 0) {
1189                 os_free(params.filter_ssids);
1190                 params.filter_ssids = NULL;
1191         }
1192
1193         extra_ie = wpa_supplicant_extra_ies(wpa_s);
1194         if (extra_ie) {
1195                 params.extra_ies = wpabuf_head(extra_ie);
1196                 params.extra_ies_len = wpabuf_len(extra_ie);
1197         }
1198
1199         if (wpa_s->conf->filter_rssi)
1200                 params.filter_rssi = wpa_s->conf->filter_rssi;
1201
1202         scan_params = &params;
1203
1204 scan:
1205         if (ssid || !wpa_s->first_sched_scan) {
1206                 wpa_dbg(wpa_s, MSG_DEBUG,
1207                         "Starting sched scan: interval %d timeout %d",
1208                         wpa_s->sched_scan_interval, wpa_s->sched_scan_timeout);
1209         } else {
1210                 wpa_dbg(wpa_s, MSG_DEBUG,
1211                         "Starting sched scan: interval %d (no timeout)",
1212                         wpa_s->sched_scan_interval);
1213         }
1214
1215         wpa_setband_scan_freqs(wpa_s, scan_params);
1216
1217         ret = wpa_supplicant_start_sched_scan(wpa_s, scan_params,
1218                                               wpa_s->sched_scan_interval);
1219         wpabuf_free(extra_ie);
1220         os_free(params.filter_ssids);
1221         if (ret) {
1222                 wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate sched scan");
1223                 if (prev_state != wpa_s->wpa_state)
1224                         wpa_supplicant_set_state(wpa_s, prev_state);
1225                 return ret;
1226         }
1227
1228         /* If we have more SSIDs to scan, add a timeout so we scan them too */
1229         if (ssid || !wpa_s->first_sched_scan) {
1230                 wpa_s->sched_scan_timed_out = 0;
1231                 eloop_register_timeout(wpa_s->sched_scan_timeout, 0,
1232                                        wpa_supplicant_sched_scan_timeout,
1233                                        wpa_s, NULL);
1234                 wpa_s->first_sched_scan = 0;
1235                 wpa_s->sched_scan_timeout /= 2;
1236                 wpa_s->sched_scan_interval *= 2;
1237                 if (wpa_s->sched_scan_timeout < wpa_s->sched_scan_interval) {
1238                         wpa_s->sched_scan_interval = 10;
1239                         wpa_s->sched_scan_timeout = max_sched_scan_ssids * 2;
1240                 }
1241         }
1242
1243         /* If there is no more ssids, start next time from the beginning */
1244         if (!ssid)
1245                 wpa_s->prev_sched_ssid = NULL;
1246
1247         return 0;
1248 }
1249
1250
1251 /**
1252  * wpa_supplicant_cancel_scan - Cancel a scheduled scan request
1253  * @wpa_s: Pointer to wpa_supplicant data
1254  *
1255  * This function is used to cancel a scan request scheduled with
1256  * wpa_supplicant_req_scan().
1257  */
1258 void wpa_supplicant_cancel_scan(struct wpa_supplicant *wpa_s)
1259 {
1260         wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling scan request");
1261         eloop_cancel_timeout(wpa_supplicant_scan, wpa_s, NULL);
1262 }
1263
1264
1265 /**
1266  * wpa_supplicant_cancel_delayed_sched_scan - Stop a delayed scheduled scan
1267  * @wpa_s: Pointer to wpa_supplicant data
1268  *
1269  * This function is used to stop a delayed scheduled scan.
1270  */
1271 void wpa_supplicant_cancel_delayed_sched_scan(struct wpa_supplicant *wpa_s)
1272 {
1273         if (!wpa_s->sched_scan_supported)
1274                 return;
1275
1276         wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling delayed sched scan");
1277         eloop_cancel_timeout(wpa_supplicant_delayed_sched_scan_timeout,
1278                              wpa_s, NULL);
1279 }
1280
1281
1282 /**
1283  * wpa_supplicant_cancel_sched_scan - Stop running scheduled scans
1284  * @wpa_s: Pointer to wpa_supplicant data
1285  *
1286  * This function is used to stop a periodic scheduled scan.
1287  */
1288 void wpa_supplicant_cancel_sched_scan(struct wpa_supplicant *wpa_s)
1289 {
1290         if (!wpa_s->sched_scanning)
1291                 return;
1292
1293         wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling sched scan");
1294         eloop_cancel_timeout(wpa_supplicant_sched_scan_timeout, wpa_s, NULL);
1295         wpa_supplicant_stop_sched_scan(wpa_s);
1296 }
1297
1298
1299 /**
1300  * wpa_supplicant_notify_scanning - Indicate possible scan state change
1301  * @wpa_s: Pointer to wpa_supplicant data
1302  * @scanning: Whether scanning is currently in progress
1303  *
1304  * This function is to generate scanning notifycations. It is called whenever
1305  * there may have been a change in scanning (scan started, completed, stopped).
1306  * wpas_notify_scanning() is called whenever the scanning state changed from the
1307  * previously notified state.
1308  */
1309 void wpa_supplicant_notify_scanning(struct wpa_supplicant *wpa_s,
1310                                     int scanning)
1311 {
1312         if (wpa_s->scanning != scanning) {
1313                 wpa_s->scanning = scanning;
1314                 wpas_notify_scanning(wpa_s);
1315         }
1316 }
1317
1318
1319 static int wpa_scan_get_max_rate(const struct wpa_scan_res *res)
1320 {
1321         int rate = 0;
1322         const u8 *ie;
1323         int i;
1324
1325         ie = wpa_scan_get_ie(res, WLAN_EID_SUPP_RATES);
1326         for (i = 0; ie && i < ie[1]; i++) {
1327                 if ((ie[i + 2] & 0x7f) > rate)
1328                         rate = ie[i + 2] & 0x7f;
1329         }
1330
1331         ie = wpa_scan_get_ie(res, WLAN_EID_EXT_SUPP_RATES);
1332         for (i = 0; ie && i < ie[1]; i++) {
1333                 if ((ie[i + 2] & 0x7f) > rate)
1334                         rate = ie[i + 2] & 0x7f;
1335         }
1336
1337         return rate;
1338 }
1339
1340
1341 /**
1342  * wpa_scan_get_ie - Fetch a specified information element from a scan result
1343  * @res: Scan result entry
1344  * @ie: Information element identitifier (WLAN_EID_*)
1345  * Returns: Pointer to the information element (id field) or %NULL if not found
1346  *
1347  * This function returns the first matching information element in the scan
1348  * result.
1349  */
1350 const u8 * wpa_scan_get_ie(const struct wpa_scan_res *res, u8 ie)
1351 {
1352         const u8 *end, *pos;
1353
1354         pos = (const u8 *) (res + 1);
1355         end = pos + res->ie_len;
1356
1357         while (pos + 1 < end) {
1358                 if (pos + 2 + pos[1] > end)
1359                         break;
1360                 if (pos[0] == ie)
1361                         return pos;
1362                 pos += 2 + pos[1];
1363         }
1364
1365         return NULL;
1366 }
1367
1368
1369 /**
1370  * wpa_scan_get_vendor_ie - Fetch vendor information element from a scan result
1371  * @res: Scan result entry
1372  * @vendor_type: Vendor type (four octets starting the IE payload)
1373  * Returns: Pointer to the information element (id field) or %NULL if not found
1374  *
1375  * This function returns the first matching information element in the scan
1376  * result.
1377  */
1378 const u8 * wpa_scan_get_vendor_ie(const struct wpa_scan_res *res,
1379                                   u32 vendor_type)
1380 {
1381         const u8 *end, *pos;
1382
1383         pos = (const u8 *) (res + 1);
1384         end = pos + res->ie_len;
1385
1386         while (pos + 1 < end) {
1387                 if (pos + 2 + pos[1] > end)
1388                         break;
1389                 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1390                     vendor_type == WPA_GET_BE32(&pos[2]))
1391                         return pos;
1392                 pos += 2 + pos[1];
1393         }
1394
1395         return NULL;
1396 }
1397
1398
1399 /**
1400  * wpa_scan_get_vendor_ie_beacon - Fetch vendor information from a scan result
1401  * @res: Scan result entry
1402  * @vendor_type: Vendor type (four octets starting the IE payload)
1403  * Returns: Pointer to the information element (id field) or %NULL if not found
1404  *
1405  * This function returns the first matching information element in the scan
1406  * result.
1407  *
1408  * This function is like wpa_scan_get_vendor_ie(), but uses IE buffer only
1409  * from Beacon frames instead of either Beacon or Probe Response frames.
1410  */
1411 const u8 * wpa_scan_get_vendor_ie_beacon(const struct wpa_scan_res *res,
1412                                          u32 vendor_type)
1413 {
1414         const u8 *end, *pos;
1415
1416         if (res->beacon_ie_len == 0)
1417                 return NULL;
1418
1419         pos = (const u8 *) (res + 1);
1420         pos += res->ie_len;
1421         end = pos + res->beacon_ie_len;
1422
1423         while (pos + 1 < end) {
1424                 if (pos + 2 + pos[1] > end)
1425                         break;
1426                 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1427                     vendor_type == WPA_GET_BE32(&pos[2]))
1428                         return pos;
1429                 pos += 2 + pos[1];
1430         }
1431
1432         return NULL;
1433 }
1434
1435
1436 /**
1437  * wpa_scan_get_vendor_ie_multi - Fetch vendor IE data from a scan result
1438  * @res: Scan result entry
1439  * @vendor_type: Vendor type (four octets starting the IE payload)
1440  * Returns: Pointer to the information element payload or %NULL if not found
1441  *
1442  * This function returns concatenated payload of possibly fragmented vendor
1443  * specific information elements in the scan result. The caller is responsible
1444  * for freeing the returned buffer.
1445  */
1446 struct wpabuf * wpa_scan_get_vendor_ie_multi(const struct wpa_scan_res *res,
1447                                              u32 vendor_type)
1448 {
1449         struct wpabuf *buf;
1450         const u8 *end, *pos;
1451
1452         buf = wpabuf_alloc(res->ie_len);
1453         if (buf == NULL)
1454                 return NULL;
1455
1456         pos = (const u8 *) (res + 1);
1457         end = pos + res->ie_len;
1458
1459         while (pos + 1 < end) {
1460                 if (pos + 2 + pos[1] > end)
1461                         break;
1462                 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1463                     vendor_type == WPA_GET_BE32(&pos[2]))
1464                         wpabuf_put_data(buf, pos + 2 + 4, pos[1] - 4);
1465                 pos += 2 + pos[1];
1466         }
1467
1468         if (wpabuf_len(buf) == 0) {
1469                 wpabuf_free(buf);
1470                 buf = NULL;
1471         }
1472
1473         return buf;
1474 }
1475
1476
1477 /*
1478  * Channels with a great SNR can operate at full rate. What is a great SNR?
1479  * This doc https://supportforums.cisco.com/docs/DOC-12954 says, "the general
1480  * rule of thumb is that any SNR above 20 is good." This one
1481  * http://www.cisco.com/en/US/tech/tk722/tk809/technologies_q_and_a_item09186a00805e9a96.shtml#qa23
1482  * recommends 25 as a minimum SNR for 54 Mbps data rate. 30 is chosen here as a
1483  * conservative value.
1484  */
1485 #define GREAT_SNR 30
1486
1487 /* Compare function for sorting scan results. Return >0 if @b is considered
1488  * better. */
1489 static int wpa_scan_result_compar(const void *a, const void *b)
1490 {
1491 #define IS_5GHZ(n) (n > 4000)
1492 #define MIN(a,b) a < b ? a : b
1493         struct wpa_scan_res **_wa = (void *) a;
1494         struct wpa_scan_res **_wb = (void *) b;
1495         struct wpa_scan_res *wa = *_wa;
1496         struct wpa_scan_res *wb = *_wb;
1497         int wpa_a, wpa_b, maxrate_a, maxrate_b;
1498         int snr_a, snr_b;
1499
1500         /* WPA/WPA2 support preferred */
1501         wpa_a = wpa_scan_get_vendor_ie(wa, WPA_IE_VENDOR_TYPE) != NULL ||
1502                 wpa_scan_get_ie(wa, WLAN_EID_RSN) != NULL;
1503         wpa_b = wpa_scan_get_vendor_ie(wb, WPA_IE_VENDOR_TYPE) != NULL ||
1504                 wpa_scan_get_ie(wb, WLAN_EID_RSN) != NULL;
1505
1506         if (wpa_b && !wpa_a)
1507                 return 1;
1508         if (!wpa_b && wpa_a)
1509                 return -1;
1510
1511         /* privacy support preferred */
1512         if ((wa->caps & IEEE80211_CAP_PRIVACY) == 0 &&
1513             (wb->caps & IEEE80211_CAP_PRIVACY))
1514                 return 1;
1515         if ((wa->caps & IEEE80211_CAP_PRIVACY) &&
1516             (wb->caps & IEEE80211_CAP_PRIVACY) == 0)
1517                 return -1;
1518
1519         if ((wa->flags & wb->flags & WPA_SCAN_LEVEL_DBM) &&
1520             !((wa->flags | wb->flags) & WPA_SCAN_NOISE_INVALID)) {
1521                 snr_a = MIN(wa->level - wa->noise, GREAT_SNR);
1522                 snr_b = MIN(wb->level - wb->noise, GREAT_SNR);
1523         } else {
1524                 /* Not suitable information to calculate SNR, so use level */
1525                 snr_a = wa->level;
1526                 snr_b = wb->level;
1527         }
1528
1529         /* best/max rate preferred if SNR close enough */
1530         if ((snr_a && snr_b && abs(snr_b - snr_a) < 5) ||
1531             (wa->qual && wb->qual && abs(wb->qual - wa->qual) < 10)) {
1532                 maxrate_a = wpa_scan_get_max_rate(wa);
1533                 maxrate_b = wpa_scan_get_max_rate(wb);
1534                 if (maxrate_a != maxrate_b)
1535                         return maxrate_b - maxrate_a;
1536                 if (IS_5GHZ(wa->freq) ^ IS_5GHZ(wb->freq))
1537                         return IS_5GHZ(wa->freq) ? -1 : 1;
1538         }
1539
1540         /* use freq for channel preference */
1541
1542         /* all things being equal, use SNR; if SNRs are
1543          * identical, use quality values since some drivers may only report
1544          * that value and leave the signal level zero */
1545         if (snr_b == snr_a)
1546                 return wb->qual - wa->qual;
1547         return snr_b - snr_a;
1548 #undef MIN
1549 #undef IS_5GHZ
1550 }
1551
1552
1553 #ifdef CONFIG_WPS
1554 /* Compare function for sorting scan results when searching a WPS AP for
1555  * provisioning. Return >0 if @b is considered better. */
1556 static int wpa_scan_result_wps_compar(const void *a, const void *b)
1557 {
1558         struct wpa_scan_res **_wa = (void *) a;
1559         struct wpa_scan_res **_wb = (void *) b;
1560         struct wpa_scan_res *wa = *_wa;
1561         struct wpa_scan_res *wb = *_wb;
1562         int uses_wps_a, uses_wps_b;
1563         struct wpabuf *wps_a, *wps_b;
1564         int res;
1565
1566         /* Optimization - check WPS IE existence before allocated memory and
1567          * doing full reassembly. */
1568         uses_wps_a = wpa_scan_get_vendor_ie(wa, WPS_IE_VENDOR_TYPE) != NULL;
1569         uses_wps_b = wpa_scan_get_vendor_ie(wb, WPS_IE_VENDOR_TYPE) != NULL;
1570         if (uses_wps_a && !uses_wps_b)
1571                 return -1;
1572         if (!uses_wps_a && uses_wps_b)
1573                 return 1;
1574
1575         if (uses_wps_a && uses_wps_b) {
1576                 wps_a = wpa_scan_get_vendor_ie_multi(wa, WPS_IE_VENDOR_TYPE);
1577                 wps_b = wpa_scan_get_vendor_ie_multi(wb, WPS_IE_VENDOR_TYPE);
1578                 res = wps_ap_priority_compar(wps_a, wps_b);
1579                 wpabuf_free(wps_a);
1580                 wpabuf_free(wps_b);
1581                 if (res)
1582                         return res;
1583         }
1584
1585         /*
1586          * Do not use current AP security policy as a sorting criteria during
1587          * WPS provisioning step since the AP may get reconfigured at the
1588          * completion of provisioning.
1589          */
1590
1591         /* all things being equal, use signal level; if signal levels are
1592          * identical, use quality values since some drivers may only report
1593          * that value and leave the signal level zero */
1594         if (wb->level == wa->level)
1595                 return wb->qual - wa->qual;
1596         return wb->level - wa->level;
1597 }
1598 #endif /* CONFIG_WPS */
1599
1600
1601 static void dump_scan_res(struct wpa_scan_results *scan_res)
1602 {
1603 #ifndef CONFIG_NO_STDOUT_DEBUG
1604         size_t i;
1605
1606         if (scan_res->res == NULL || scan_res->num == 0)
1607                 return;
1608
1609         wpa_printf(MSG_EXCESSIVE, "Sorted scan results");
1610
1611         for (i = 0; i < scan_res->num; i++) {
1612                 struct wpa_scan_res *r = scan_res->res[i];
1613                 u8 *pos;
1614                 if ((r->flags & (WPA_SCAN_LEVEL_DBM | WPA_SCAN_NOISE_INVALID))
1615                     == WPA_SCAN_LEVEL_DBM) {
1616                         int snr = r->level - r->noise;
1617                         wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d "
1618                                    "noise=%d level=%d snr=%d%s flags=0x%x "
1619                                    "age=%u",
1620                                    MAC2STR(r->bssid), r->freq, r->qual,
1621                                    r->noise, r->level, snr,
1622                                    snr >= GREAT_SNR ? "*" : "", r->flags,
1623                                    r->age);
1624                 } else {
1625                         wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d "
1626                                    "noise=%d level=%d flags=0x%x age=%u",
1627                                    MAC2STR(r->bssid), r->freq, r->qual,
1628                                    r->noise, r->level, r->flags, r->age);
1629                 }
1630                 pos = (u8 *) (r + 1);
1631                 if (r->ie_len)
1632                         wpa_hexdump(MSG_EXCESSIVE, "IEs", pos, r->ie_len);
1633                 pos += r->ie_len;
1634                 if (r->beacon_ie_len)
1635                         wpa_hexdump(MSG_EXCESSIVE, "Beacon IEs",
1636                                     pos, r->beacon_ie_len);
1637         }
1638 #endif /* CONFIG_NO_STDOUT_DEBUG */
1639 }
1640
1641
1642 /**
1643  * wpa_supplicant_filter_bssid_match - Is the specified BSSID allowed
1644  * @wpa_s: Pointer to wpa_supplicant data
1645  * @bssid: BSSID to check
1646  * Returns: 0 if the BSSID is filtered or 1 if not
1647  *
1648  * This function is used to filter out specific BSSIDs from scan reslts mainly
1649  * for testing purposes (SET bssid_filter ctrl_iface command).
1650  */
1651 int wpa_supplicant_filter_bssid_match(struct wpa_supplicant *wpa_s,
1652                                       const u8 *bssid)
1653 {
1654         size_t i;
1655
1656         if (wpa_s->bssid_filter == NULL)
1657                 return 1;
1658
1659         for (i = 0; i < wpa_s->bssid_filter_count; i++) {
1660                 if (os_memcmp(wpa_s->bssid_filter + i * ETH_ALEN, bssid,
1661                               ETH_ALEN) == 0)
1662                         return 1;
1663         }
1664
1665         return 0;
1666 }
1667
1668
1669 static void filter_scan_res(struct wpa_supplicant *wpa_s,
1670                             struct wpa_scan_results *res)
1671 {
1672         size_t i, j;
1673
1674         if (wpa_s->bssid_filter == NULL)
1675                 return;
1676
1677         for (i = 0, j = 0; i < res->num; i++) {
1678                 if (wpa_supplicant_filter_bssid_match(wpa_s,
1679                                                       res->res[i]->bssid)) {
1680                         res->res[j++] = res->res[i];
1681                 } else {
1682                         os_free(res->res[i]);
1683                         res->res[i] = NULL;
1684                 }
1685         }
1686
1687         if (res->num != j) {
1688                 wpa_printf(MSG_DEBUG, "Filtered out %d scan results",
1689                            (int) (res->num - j));
1690                 res->num = j;
1691         }
1692 }
1693
1694
1695 /**
1696  * wpa_supplicant_get_scan_results - Get scan results
1697  * @wpa_s: Pointer to wpa_supplicant data
1698  * @info: Information about what was scanned or %NULL if not available
1699  * @new_scan: Whether a new scan was performed
1700  * Returns: Scan results, %NULL on failure
1701  *
1702  * This function request the current scan results from the driver and updates
1703  * the local BSS list wpa_s->bss. The caller is responsible for freeing the
1704  * results with wpa_scan_results_free().
1705  */
1706 struct wpa_scan_results *
1707 wpa_supplicant_get_scan_results(struct wpa_supplicant *wpa_s,
1708                                 struct scan_info *info, int new_scan)
1709 {
1710         struct wpa_scan_results *scan_res;
1711         size_t i;
1712         int (*compar)(const void *, const void *) = wpa_scan_result_compar;
1713
1714         scan_res = wpa_drv_get_scan_results2(wpa_s);
1715         if (scan_res == NULL) {
1716                 wpa_dbg(wpa_s, MSG_DEBUG, "Failed to get scan results");
1717                 return NULL;
1718         }
1719         if (scan_res->fetch_time.sec == 0) {
1720                 /*
1721                  * Make sure we have a valid timestamp if the driver wrapper
1722                  * does not set this.
1723                  */
1724                 os_get_reltime(&scan_res->fetch_time);
1725         }
1726         filter_scan_res(wpa_s, scan_res);
1727
1728 #ifdef CONFIG_WPS
1729         if (wpas_wps_searching(wpa_s)) {
1730                 wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Order scan results with WPS "
1731                         "provisioning rules");
1732                 compar = wpa_scan_result_wps_compar;
1733         }
1734 #endif /* CONFIG_WPS */
1735
1736         qsort(scan_res->res, scan_res->num, sizeof(struct wpa_scan_res *),
1737               compar);
1738         dump_scan_res(scan_res);
1739
1740         wpa_bss_update_start(wpa_s);
1741         for (i = 0; i < scan_res->num; i++)
1742                 wpa_bss_update_scan_res(wpa_s, scan_res->res[i],
1743                                         &scan_res->fetch_time);
1744         wpa_bss_update_end(wpa_s, info, new_scan);
1745
1746         return scan_res;
1747 }
1748
1749
1750 /**
1751  * wpa_supplicant_update_scan_results - Update scan results from the driver
1752  * @wpa_s: Pointer to wpa_supplicant data
1753  * Returns: 0 on success, -1 on failure
1754  *
1755  * This function updates the BSS table within wpa_supplicant based on the
1756  * currently available scan results from the driver without requesting a new
1757  * scan. This is used in cases where the driver indicates an association
1758  * (including roaming within ESS) and wpa_supplicant does not yet have the
1759  * needed information to complete the connection (e.g., to perform validation
1760  * steps in 4-way handshake).
1761  */
1762 int wpa_supplicant_update_scan_results(struct wpa_supplicant *wpa_s)
1763 {
1764         struct wpa_scan_results *scan_res;
1765         scan_res = wpa_supplicant_get_scan_results(wpa_s, NULL, 0);
1766         if (scan_res == NULL)
1767                 return -1;
1768         wpa_scan_results_free(scan_res);
1769
1770         return 0;
1771 }
1772
1773
1774 /**
1775  * scan_only_handler - Reports scan results
1776  */
1777 void scan_only_handler(struct wpa_supplicant *wpa_s,
1778                        struct wpa_scan_results *scan_res)
1779 {
1780         wpa_dbg(wpa_s, MSG_DEBUG, "Scan-only results received");
1781         if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
1782             wpa_s->manual_scan_use_id && wpa_s->own_scan_running) {
1783                 wpa_msg_ctrl(wpa_s, MSG_INFO, WPA_EVENT_SCAN_RESULTS "id=%u",
1784                              wpa_s->manual_scan_id);
1785                 wpa_s->manual_scan_use_id = 0;
1786         } else {
1787                 wpa_msg_ctrl(wpa_s, MSG_INFO, WPA_EVENT_SCAN_RESULTS);
1788         }
1789         wpas_notify_scan_results(wpa_s);
1790         wpas_notify_scan_done(wpa_s, 1);
1791         if (wpa_s->scan_work) {
1792                 struct wpa_radio_work *work = wpa_s->scan_work;
1793                 wpa_s->scan_work = NULL;
1794                 radio_work_done(work);
1795         }
1796 }
1797
1798
1799 int wpas_scan_scheduled(struct wpa_supplicant *wpa_s)
1800 {
1801         return eloop_is_timeout_registered(wpa_supplicant_scan, wpa_s, NULL);
1802 }
1803
1804
1805 struct wpa_driver_scan_params *
1806 wpa_scan_clone_params(const struct wpa_driver_scan_params *src)
1807 {
1808         struct wpa_driver_scan_params *params;
1809         size_t i;
1810         u8 *n;
1811
1812         params = os_zalloc(sizeof(*params));
1813         if (params == NULL)
1814                 return NULL;
1815
1816         for (i = 0; i < src->num_ssids; i++) {
1817                 if (src->ssids[i].ssid) {
1818                         n = os_malloc(src->ssids[i].ssid_len);
1819                         if (n == NULL)
1820                                 goto failed;
1821                         os_memcpy(n, src->ssids[i].ssid,
1822                                   src->ssids[i].ssid_len);
1823                         params->ssids[i].ssid = n;
1824                         params->ssids[i].ssid_len = src->ssids[i].ssid_len;
1825                 }
1826         }
1827         params->num_ssids = src->num_ssids;
1828
1829         if (src->extra_ies) {
1830                 n = os_malloc(src->extra_ies_len);
1831                 if (n == NULL)
1832                         goto failed;
1833                 os_memcpy(n, src->extra_ies, src->extra_ies_len);
1834                 params->extra_ies = n;
1835                 params->extra_ies_len = src->extra_ies_len;
1836         }
1837
1838         if (src->freqs) {
1839                 int len = int_array_len(src->freqs);
1840                 params->freqs = os_malloc((len + 1) * sizeof(int));
1841                 if (params->freqs == NULL)
1842                         goto failed;
1843                 os_memcpy(params->freqs, src->freqs, (len + 1) * sizeof(int));
1844         }
1845
1846         if (src->filter_ssids) {
1847                 params->filter_ssids = os_malloc(sizeof(*params->filter_ssids) *
1848                                                  src->num_filter_ssids);
1849                 if (params->filter_ssids == NULL)
1850                         goto failed;
1851                 os_memcpy(params->filter_ssids, src->filter_ssids,
1852                           sizeof(*params->filter_ssids) *
1853                           src->num_filter_ssids);
1854                 params->num_filter_ssids = src->num_filter_ssids;
1855         }
1856
1857         params->filter_rssi = src->filter_rssi;
1858         params->p2p_probe = src->p2p_probe;
1859         params->only_new_results = src->only_new_results;
1860
1861         return params;
1862
1863 failed:
1864         wpa_scan_free_params(params);
1865         return NULL;
1866 }
1867
1868
1869 void wpa_scan_free_params(struct wpa_driver_scan_params *params)
1870 {
1871         size_t i;
1872
1873         if (params == NULL)
1874                 return;
1875
1876         for (i = 0; i < params->num_ssids; i++)
1877                 os_free((u8 *) params->ssids[i].ssid);
1878         os_free((u8 *) params->extra_ies);
1879         os_free(params->freqs);
1880         os_free(params->filter_ssids);
1881         os_free(params);
1882 }
1883
1884
1885 int wpas_start_pno(struct wpa_supplicant *wpa_s)
1886 {
1887         int ret, interval;
1888         size_t i, num_ssid;
1889         struct wpa_ssid *ssid;
1890         struct wpa_driver_scan_params params;
1891
1892         if (!wpa_s->sched_scan_supported)
1893                 return -1;
1894
1895         if (wpa_s->pno || wpa_s->pno_sched_pending)
1896                 return 0;
1897
1898         if ((wpa_s->wpa_state > WPA_SCANNING) &&
1899             (wpa_s->wpa_state <= WPA_COMPLETED)) {
1900                 wpa_printf(MSG_ERROR, "PNO: In assoc process");
1901                 return -EAGAIN;
1902         }
1903
1904         if (wpa_s->wpa_state == WPA_SCANNING) {
1905                 wpa_supplicant_cancel_scan(wpa_s);
1906                 if (wpa_s->sched_scanning) {
1907                         wpa_printf(MSG_DEBUG, "Schedule PNO on completion of "
1908                                    "ongoing sched scan");
1909                         wpa_supplicant_cancel_sched_scan(wpa_s);
1910                         wpa_s->pno_sched_pending = 1;
1911                         return 0;
1912                 }
1913         }
1914
1915         os_memset(&params, 0, sizeof(params));
1916
1917         num_ssid = 0;
1918         ssid = wpa_s->conf->ssid;
1919         while (ssid) {
1920                 if (!wpas_network_disabled(wpa_s, ssid))
1921                         num_ssid++;
1922                 ssid = ssid->next;
1923         }
1924         if (num_ssid > WPAS_MAX_SCAN_SSIDS) {
1925                 wpa_printf(MSG_DEBUG, "PNO: Use only the first %u SSIDs from "
1926                            "%u", WPAS_MAX_SCAN_SSIDS, (unsigned int) num_ssid);
1927                 num_ssid = WPAS_MAX_SCAN_SSIDS;
1928         }
1929
1930         if (num_ssid == 0) {
1931                 wpa_printf(MSG_DEBUG, "PNO: No configured SSIDs");
1932                 return -1;
1933         }
1934
1935         params.filter_ssids = os_malloc(sizeof(struct wpa_driver_scan_filter) *
1936                                         num_ssid);
1937         if (params.filter_ssids == NULL)
1938                 return -1;
1939         i = 0;
1940         ssid = wpa_s->conf->ssid;
1941         while (ssid) {
1942                 if (!wpas_network_disabled(wpa_s, ssid)) {
1943                         params.ssids[i].ssid = ssid->ssid;
1944                         params.ssids[i].ssid_len = ssid->ssid_len;
1945                         params.num_ssids++;
1946                         os_memcpy(params.filter_ssids[i].ssid, ssid->ssid,
1947                                   ssid->ssid_len);
1948                         params.filter_ssids[i].ssid_len = ssid->ssid_len;
1949                         params.num_filter_ssids++;
1950                         i++;
1951                         if (i == num_ssid)
1952                                 break;
1953                 }
1954                 ssid = ssid->next;
1955         }
1956
1957         if (wpa_s->conf->filter_rssi)
1958                 params.filter_rssi = wpa_s->conf->filter_rssi;
1959
1960         interval = wpa_s->conf->sched_scan_interval ?
1961                 wpa_s->conf->sched_scan_interval : 10;
1962
1963         if (params.freqs == NULL && wpa_s->manual_sched_scan_freqs) {
1964                 wpa_dbg(wpa_s, MSG_DEBUG, "Limit sched scan to specified channels");
1965                 params.freqs = wpa_s->manual_sched_scan_freqs;
1966         }
1967
1968         ret = wpa_supplicant_start_sched_scan(wpa_s, &params, interval);
1969         os_free(params.filter_ssids);
1970         if (ret == 0)
1971                 wpa_s->pno = 1;
1972         else
1973                 wpa_msg(wpa_s, MSG_ERROR, "Failed to schedule PNO");
1974         return ret;
1975 }
1976
1977
1978 int wpas_stop_pno(struct wpa_supplicant *wpa_s)
1979 {
1980         int ret = 0;
1981
1982         if (!wpa_s->pno)
1983                 return 0;
1984
1985         ret = wpa_supplicant_stop_sched_scan(wpa_s);
1986
1987         wpa_s->pno = 0;
1988         wpa_s->pno_sched_pending = 0;
1989
1990         if (wpa_s->wpa_state == WPA_SCANNING)
1991                 wpa_supplicant_req_scan(wpa_s, 0, 0);
1992
1993         return ret;
1994 }