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 #ifdef CONFIG_P2P
 609         if (wpas_p2p_in_progress(wpa_s)) {
 610                 wpa_dbg(wpa_s, MSG_DEBUG, "Delay station mode scan while P2P operation is in progress");
 611                 wpa_supplicant_req_scan(wpa_s, 5, 0);
 612                 return;
 613         }
 614 #endif /* CONFIG_P2P */
 615
 616         if (wpa_s->conf->ap_scan == 2)
 617                 max_ssids = 1;
 618         else {
 619                 max_ssids = wpa_s->max_scan_ssids;
 620                 if (max_ssids > WPAS_MAX_SCAN_SSIDS)
 621                         max_ssids = WPAS_MAX_SCAN_SSIDS;
 622         }
 623
 624         wpa_s->last_scan_req = wpa_s->scan_req;
 625         wpa_s->scan_req = NORMAL_SCAN_REQ;
 626
 627         os_memset(&params, 0, sizeof(params));
 628
 629         prev_state = wpa_s->wpa_state;
 630         if (wpa_s->wpa_state == WPA_DISCONNECTED ||
 631             wpa_s->wpa_state == WPA_INACTIVE)
 632                 wpa_supplicant_set_state(wpa_s, WPA_SCANNING);
 633
 634         /*
 635          * If autoscan has set its own scanning parameters
 636          */
 637         if (wpa_s->autoscan_params != NULL) {
 638                 scan_params = wpa_s->autoscan_params;
 639                 goto scan;
 640         }
 641
 642         if (wpa_s->last_scan_req != MANUAL_SCAN_REQ &&
 643             wpa_s->connect_without_scan) {
 644                 for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
 645                         if (ssid == wpa_s->connect_without_scan)
 646                                 break;
 647                 }
 648                 wpa_s->connect_without_scan = NULL;
 649                 if (ssid) {
 650                         wpa_printf(MSG_DEBUG, "Start a pre-selected network "
 651                                    "without scan step");
 652                         wpa_supplicant_associate(wpa_s, NULL, ssid);
 653                         return;
 654                 }
 655         }
 656
 657 #ifdef CONFIG_P2P
 658         if ((wpa_s->p2p_in_provisioning || wpa_s->show_group_started) &&
 659             wpa_s->go_params) {
 660                 wpa_printf(MSG_DEBUG, "P2P: Use specific SSID for scan during P2P group formation (p2p_in_provisioning=%d show_group_started=%d)",
 661                            wpa_s->p2p_in_provisioning,
 662                            wpa_s->show_group_started);
 663                 params.ssids[0].ssid = wpa_s->go_params->ssid;
 664                 params.ssids[0].ssid_len = wpa_s->go_params->ssid_len;
 665                 params.num_ssids = 1;
 666                 goto ssid_list_set;
 667         }
 668
 669         if (wpa_s->p2p_in_invitation) {
 670                 if (wpa_s->current_ssid) {
 671                         wpa_printf(MSG_DEBUG, "P2P: Use specific SSID for scan during invitation");
 672                         params.ssids[0].ssid = wpa_s->current_ssid->ssid;
 673                         params.ssids[0].ssid_len =
 674                                 wpa_s->current_ssid->ssid_len;
 675                         params.num_ssids = 1;
 676                 } else {
 677                         wpa_printf(MSG_DEBUG, "P2P: No specific SSID known for scan during invitation");
 678                 }
 679                 goto ssid_list_set;
 680         }
 681 #endif /* CONFIG_P2P */
 682
 683         /* Find the starting point from which to continue scanning */
 684         ssid = wpa_s->conf->ssid;
 685         if (wpa_s->prev_scan_ssid != WILDCARD_SSID_SCAN) {
 686                 while (ssid) {
 687                         if (ssid == wpa_s->prev_scan_ssid) {
 688                                 ssid = ssid->next;
 689                                 break;
 690                         }
 691                         ssid = ssid->next;
 692                 }
 693         }
 694
 695         if (wpa_s->last_scan_req != MANUAL_SCAN_REQ &&
 696             wpa_s->conf->ap_scan == 2) {
 697                 wpa_s->connect_without_scan = NULL;
 698                 wpa_s->prev_scan_wildcard = 0;
 699                 wpa_supplicant_assoc_try(wpa_s, ssid);
 700                 return;
 701         } else if (wpa_s->conf->ap_scan == 2) {
 702                 /*
 703                  * User-initiated scan request in ap_scan == 2; scan with
 704                  * wildcard SSID.
 705                  */
 706                 ssid = NULL;
 707         } else if (wpa_s->reattach && wpa_s->current_ssid != NULL) {
 708                 /*
 709                  * Perform single-channel single-SSID scan for
 710                  * reassociate-to-same-BSS operation.
 711                  */
 712                 /* Setup SSID */
 713                 ssid = wpa_s->current_ssid;
 714                 wpa_hexdump_ascii(MSG_DEBUG, "Scan SSID",
 715                                   ssid->ssid, ssid->ssid_len);
 716                 params.ssids[0].ssid = ssid->ssid;
 717                 params.ssids[0].ssid_len = ssid->ssid_len;
 718                 params.num_ssids = 1;
 719
 720                 /*
 721                  * Allocate memory for frequency array, allocate one extra
 722                  * slot for the zero-terminator.
 723                  */
 724                 params.freqs = os_malloc(sizeof(int) * 2);
 725                 if (params.freqs == NULL) {
 726                         wpa_dbg(wpa_s, MSG_ERROR, "Memory allocation failed");
 727                         return;
 728                 }
 729                 params.freqs[0] = wpa_s->assoc_freq;
 730                 params.freqs[1] = 0;
 731
 732                 /*
 733                  * Reset the reattach flag so that we fall back to full scan if
 734                  * this scan fails.
 735                  */
 736                 wpa_s->reattach = 0;
 737         } else {
 738                 struct wpa_ssid *start = ssid, *tssid;
 739                 int freqs_set = 0;
 740                 if (ssid == NULL && max_ssids > 1)
 741                         ssid = wpa_s->conf->ssid;
 742                 while (ssid) {
 743                         if (!wpas_network_disabled(wpa_s, ssid) &&
 744                             ssid->scan_ssid) {
 745                                 wpa_hexdump_ascii(MSG_DEBUG, "Scan SSID",
 746                                                   ssid->ssid, ssid->ssid_len);
 747                                 params.ssids[params.num_ssids].ssid =
 748                                         ssid->ssid;
 749                                 params.ssids[params.num_ssids].ssid_len =
 750                                         ssid->ssid_len;
 751                                 params.num_ssids++;
 752                                 if (params.num_ssids + 1 >= max_ssids)
 753                                         break;
 754                         }
 755                         ssid = ssid->next;
 756                         if (ssid == start)
 757                                 break;
 758                         if (ssid == NULL && max_ssids > 1 &&
 759                             start != wpa_s->conf->ssid)
 760                                 ssid = wpa_s->conf->ssid;
 761                 }
 762
 763                 for (tssid = wpa_s->conf->ssid; tssid; tssid = tssid->next) {
 764                         if (wpas_network_disabled(wpa_s, tssid))
 765                                 continue;
 766                         if ((params.freqs || !freqs_set) && tssid->scan_freq) {
 767                                 int_array_concat(&params.freqs,
 768                                                  tssid->scan_freq);
 769                         } else {
 770                                 os_free(params.freqs);
 771                                 params.freqs = NULL;
 772                         }
 773                         freqs_set = 1;
 774                 }
 775                 int_array_sort_unique(params.freqs);
 776         }
 777
 778         if (ssid && max_ssids == 1) {
 779                 /*
 780                  * If the driver is limited to 1 SSID at a time interleave
 781                  * wildcard SSID scans with specific SSID scans to avoid
 782                  * waiting a long time for a wildcard scan.
 783                  */
 784                 if (!wpa_s->prev_scan_wildcard) {
 785                         params.ssids[0].ssid = NULL;
 786                         params.ssids[0].ssid_len = 0;
 787                         wpa_s->prev_scan_wildcard = 1;
 788                         wpa_dbg(wpa_s, MSG_DEBUG, "Starting AP scan for "
 789                                 "wildcard SSID (Interleave with specific)");
 790                 } else {
 791                         wpa_s->prev_scan_ssid = ssid;
 792                         wpa_s->prev_scan_wildcard = 0;
 793                         wpa_dbg(wpa_s, MSG_DEBUG,
 794                                 "Starting AP scan for specific SSID: %s",
 795                                 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
 796                 }
 797         } else if (ssid) {
 798                 /* max_ssids > 1 */
 799
 800                 wpa_s->prev_scan_ssid = ssid;
 801                 wpa_dbg(wpa_s, MSG_DEBUG, "Include wildcard SSID in "
 802                         "the scan request");
 803                 params.num_ssids++;
 804         } else if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
 805                    wpa_s->manual_scan_passive && params.num_ssids == 0) {
 806                 wpa_dbg(wpa_s, MSG_DEBUG, "Use passive scan based on manual request");
 807         } else {
 808                 wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
 809                 params.num_ssids++;
 810                 wpa_dbg(wpa_s, MSG_DEBUG, "Starting AP scan for wildcard "
 811                         "SSID");
 812         }
 813 #ifdef CONFIG_P2P
 814 ssid_list_set:
 815 #endif /* CONFIG_P2P */
 816
 817         wpa_supplicant_optimize_freqs(wpa_s, &params);
 818         extra_ie = wpa_supplicant_extra_ies(wpa_s);
 819
 820         if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
 821             wpa_s->manual_scan_only_new)
 822                 params.only_new_results = 1;
 823
 824         if (wpa_s->last_scan_req == MANUAL_SCAN_REQ && params.freqs == NULL &&
 825             wpa_s->manual_scan_freqs) {
 826                 wpa_dbg(wpa_s, MSG_DEBUG, "Limit manual scan to specified channels");
 827                 params.freqs = wpa_s->manual_scan_freqs;
 828                 wpa_s->manual_scan_freqs = NULL;
 829         }
 830
 831         if (params.freqs == NULL && wpa_s->next_scan_freqs) {
 832                 wpa_dbg(wpa_s, MSG_DEBUG, "Optimize scan based on previously "
 833                         "generated frequency list");
 834                 params.freqs = wpa_s->next_scan_freqs;
 835         } else
 836                 os_free(wpa_s->next_scan_freqs);
 837         wpa_s->next_scan_freqs = NULL;
 838         wpa_setband_scan_freqs(wpa_s, &params);
 839
 840         /* See if user specified frequencies. If so, scan only those. */
 841         if (wpa_s->conf->freq_list && !params.freqs) {
 842                 wpa_dbg(wpa_s, MSG_DEBUG,
 843                         "Optimize scan based on conf->freq_list");
 844                 int_array_concat(&params.freqs, wpa_s->conf->freq_list);
 845         }
 846
 847         /* Use current associated channel? */
 848         if (wpa_s->conf->scan_cur_freq && !params.freqs) {
 849                 unsigned int num = wpa_s->num_multichan_concurrent;
 850
 851                 params.freqs = os_calloc(num + 1, sizeof(int));
 852                 if (params.freqs) {
 853                         num = get_shared_radio_freqs(wpa_s, params.freqs, num);
 854                         if (num > 0) {
 855                                 wpa_dbg(wpa_s, MSG_DEBUG, "Scan only the "
 856                                         "current operating channels since "
 857                                         "scan_cur_freq is enabled");
 858                         } else {
 859                                 os_free(params.freqs);
 860                                 params.freqs = NULL;
 861                         }
 862                 }
 863         }
 864
 865         params.filter_ssids = wpa_supplicant_build_filter_ssids(
 866                 wpa_s->conf, &params.num_filter_ssids);
 867         if (extra_ie) {
 868                 params.extra_ies = wpabuf_head(extra_ie);
 869                 params.extra_ies_len = wpabuf_len(extra_ie);
 870         }
 871
 872 #ifdef CONFIG_P2P
 873         if (wpa_s->p2p_in_provisioning ||
 874             (wpa_s->show_group_started && wpa_s->go_params)) {
 875                 /*
 876                  * The interface may not yet be in P2P mode, so we have to
 877                  * explicitly request P2P probe to disable CCK rates.
 878                  */
 879                 params.p2p_probe = 1;
 880         }
 881 #endif /* CONFIG_P2P */
 882
 883         scan_params = &params;
 884
 885 scan:
 886 #ifdef CONFIG_P2P
 887         /*
 888          * If the driver does not support multi-channel concurrency and a
 889          * virtual interface that shares the same radio with the wpa_s interface
 890          * is operating there may not be need to scan other channels apart from
 891          * the current operating channel on the other virtual interface. Filter
 892          * out other channels in case we are trying to find a connection for a
 893          * station interface when we are not configured to prefer station
 894          * connection and a concurrent operation is already in process.
 895          */
 896         if (wpa_s->scan_for_connection &&
 897             wpa_s->last_scan_req == NORMAL_SCAN_REQ &&
 898             !scan_params->freqs && !params.freqs &&
 899             wpas_is_p2p_prioritized(wpa_s) &&
 900             wpa_s->p2p_group_interface == NOT_P2P_GROUP_INTERFACE &&
 901             non_p2p_network_enabled(wpa_s)) {
 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 && num == wpa_s->num_multichan_concurrent) {
 908                                 wpa_dbg(wpa_s, MSG_DEBUG, "Scan only the current operating channels since all channels are already used");
 909                         } else {
 910                                 os_free(params.freqs);
 911                                 params.freqs = NULL;
 912                         }
 913                 }
 914         }
 915 #endif /* CONFIG_P2P */
 916
 917         ret = wpa_supplicant_trigger_scan(wpa_s, scan_params);
 918
 919         if (ret && wpa_s->last_scan_req == MANUAL_SCAN_REQ && params.freqs &&
 920             !wpa_s->manual_scan_freqs) {
 921                 /* Restore manual_scan_freqs for the next attempt */
 922                 wpa_s->manual_scan_freqs = params.freqs;
 923                 params.freqs = NULL;
 924         }
 925
 926         wpabuf_free(extra_ie);
 927         os_free(params.freqs);
 928         os_free(params.filter_ssids);
 929
 930         if (ret) {
 931                 wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate AP scan");
 932                 if (prev_state != wpa_s->wpa_state)
 933                         wpa_supplicant_set_state(wpa_s, prev_state);
 934                 /* Restore scan_req since we will try to scan again */
 935                 wpa_s->scan_req = wpa_s->last_scan_req;
 936                 wpa_supplicant_req_scan(wpa_s, 1, 0);
 937         } else {
 938                 wpa_s->scan_for_connection = 0;
 939         }
 940 }
 941
 942
 943 void wpa_supplicant_update_scan_int(struct wpa_supplicant *wpa_s, int sec)
 944 {
 945         struct os_reltime remaining, new_int;
 946         int cancelled;
 947
 948         cancelled = eloop_cancel_timeout_one(wpa_supplicant_scan, wpa_s, NULL,
 949                                              &remaining);
 950
 951         new_int.sec = sec;
 952         new_int.usec = 0;
 953         if (cancelled && os_reltime_before(&remaining, &new_int)) {
 954                 new_int.sec = remaining.sec;
 955                 new_int.usec = remaining.usec;
 956         }
 957
 958         if (cancelled) {
 959                 eloop_register_timeout(new_int.sec, new_int.usec,
 960                                        wpa_supplicant_scan, wpa_s, NULL);
 961         }
 962         wpa_s->scan_interval = sec;
 963 }
 964
 965
 966 /**
 967  * wpa_supplicant_req_scan - Schedule a scan for neighboring access points
 968  * @wpa_s: Pointer to wpa_supplicant data
 969  * @sec: Number of seconds after which to scan
 970  * @usec: Number of microseconds after which to scan
 971  *
 972  * This function is used to schedule a scan for neighboring access points after
 973  * the specified time.
 974  */
 975 void wpa_supplicant_req_scan(struct wpa_supplicant *wpa_s, int sec, int usec)
 976 {
 977         int res = eloop_deplete_timeout(sec, usec, wpa_supplicant_scan, wpa_s,
 978                                         NULL);
 979         if (res == 1) {
 980                 wpa_dbg(wpa_s, MSG_DEBUG, "Rescheduling scan request: %d.%06d sec",
 981                         sec, usec);
 982         } else if (res == 0) {
 983                 wpa_dbg(wpa_s, MSG_DEBUG, "Ignore new scan request for %d.%06d sec since an earlier request is scheduled to trigger sooner",
 984                         sec, usec);
 985         } else {
 986                 wpa_dbg(wpa_s, MSG_DEBUG, "Setting scan request: %d.%06d sec",
 987                         sec, usec);
 988                 eloop_register_timeout(sec, usec, wpa_supplicant_scan, wpa_s, NULL);
 989         }
 990 }
 991
 992
 993 /**
 994  * wpa_supplicant_delayed_sched_scan - Request a delayed scheduled scan
 995  * @wpa_s: Pointer to wpa_supplicant data
 996  * @sec: Number of seconds after which to scan
 997  * @usec: Number of microseconds after which to scan
 998  * Returns: 0 on success or -1 otherwise
 999  *
1000  * This function is used to schedule periodic scans for neighboring
1001  * access points after the specified time.
1002  */
1003 int wpa_supplicant_delayed_sched_scan(struct wpa_supplicant *wpa_s,
1004                                       int sec, int usec)
1005 {
1006         if (!wpa_s->sched_scan_supported)
1007                 return -1;
1008
1009         eloop_register_timeout(sec, usec,
1010                                wpa_supplicant_delayed_sched_scan_timeout,
1011                                wpa_s, NULL);
1012
1013         return 0;
1014 }
1015
1016
1017 /**
1018  * wpa_supplicant_req_sched_scan - Start a periodic scheduled scan
1019  * @wpa_s: Pointer to wpa_supplicant data
1020  * Returns: 0 is sched_scan was started or -1 otherwise
1021  *
1022  * This function is used to schedule periodic scans for neighboring
1023  * access points repeating the scan continuously.
1024  */
1025 int wpa_supplicant_req_sched_scan(struct wpa_supplicant *wpa_s)
1026 {
1027         struct wpa_driver_scan_params params;
1028         struct wpa_driver_scan_params *scan_params;
1029         enum wpa_states prev_state;
1030         struct wpa_ssid *ssid = NULL;
1031         struct wpabuf *extra_ie = NULL;
1032         int ret;
1033         unsigned int max_sched_scan_ssids;
1034         int wildcard = 0;
1035         int need_ssids;
1036
1037         if (!wpa_s->sched_scan_supported)
1038                 return -1;
1039
1040         if (wpa_s->max_sched_scan_ssids > WPAS_MAX_SCAN_SSIDS)
1041                 max_sched_scan_ssids = WPAS_MAX_SCAN_SSIDS;
1042         else
1043                 max_sched_scan_ssids = wpa_s->max_sched_scan_ssids;
1044         if (max_sched_scan_ssids < 1 || wpa_s->conf->disable_scan_offload)
1045                 return -1;
1046
1047         if (wpa_s->sched_scanning) {
1048                 wpa_dbg(wpa_s, MSG_DEBUG, "Already sched scanning");
1049                 return 0;
1050         }
1051
1052         need_ssids = 0;
1053         for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
1054                 if (!wpas_network_disabled(wpa_s, ssid) && !ssid->scan_ssid) {
1055                         /* Use wildcard SSID to find this network */
1056                         wildcard = 1;
1057                 } else if (!wpas_network_disabled(wpa_s, ssid) &&
1058                            ssid->ssid_len)
1059                         need_ssids++;
1060
1061 #ifdef CONFIG_WPS
1062                 if (!wpas_network_disabled(wpa_s, ssid) &&
1063                     ssid->key_mgmt == WPA_KEY_MGMT_WPS) {
1064                         /*
1065                          * Normal scan is more reliable and faster for WPS
1066                          * operations and since these are for short periods of
1067                          * time, the benefit of trying to use sched_scan would
1068                          * be limited.
1069                          */
1070                         wpa_dbg(wpa_s, MSG_DEBUG, "Use normal scan instead of "
1071                                 "sched_scan for WPS");
1072                         return -1;
1073                 }
1074 #endif /* CONFIG_WPS */
1075         }
1076         if (wildcard)
1077                 need_ssids++;
1078
1079         if (wpa_s->normal_scans < 3 &&
1080             (need_ssids <= wpa_s->max_scan_ssids ||
1081              wpa_s->max_scan_ssids >= (int) max_sched_scan_ssids)) {
1082                 /*
1083                  * When normal scan can speed up operations, use that for the
1084                  * first operations before starting the sched_scan to allow
1085                  * user space sleep more. We do this only if the normal scan
1086                  * has functionality that is suitable for this or if the
1087                  * sched_scan does not have better support for multiple SSIDs.
1088                  */
1089                 wpa_dbg(wpa_s, MSG_DEBUG, "Use normal scan instead of "
1090                         "sched_scan for initial scans (normal_scans=%d)",
1091                         wpa_s->normal_scans);
1092                 return -1;
1093         }
1094
1095         os_memset(&params, 0, sizeof(params));
1096
1097         /* If we can't allocate space for the filters, we just don't filter */
1098         params.filter_ssids = os_zalloc(wpa_s->max_match_sets *
1099                                         sizeof(struct wpa_driver_scan_filter));
1100
1101         prev_state = wpa_s->wpa_state;
1102         if (wpa_s->wpa_state == WPA_DISCONNECTED ||
1103             wpa_s->wpa_state == WPA_INACTIVE)
1104                 wpa_supplicant_set_state(wpa_s, WPA_SCANNING);
1105
1106         if (wpa_s->autoscan_params != NULL) {
1107                 scan_params = wpa_s->autoscan_params;
1108                 goto scan;
1109         }
1110
1111         /* Find the starting point from which to continue scanning */
1112         ssid = wpa_s->conf->ssid;
1113         if (wpa_s->prev_sched_ssid) {
1114                 while (ssid) {
1115                         if (ssid == wpa_s->prev_sched_ssid) {
1116                                 ssid = ssid->next;
1117                                 break;
1118                         }
1119                         ssid = ssid->next;
1120                 }
1121         }
1122
1123         if (!ssid || !wpa_s->prev_sched_ssid) {
1124                 wpa_dbg(wpa_s, MSG_DEBUG, "Beginning of SSID list");
1125                 if (wpa_s->conf->sched_scan_interval)
1126                         wpa_s->sched_scan_interval =
1127                                 wpa_s->conf->sched_scan_interval;
1128                 if (wpa_s->sched_scan_interval == 0)
1129                         wpa_s->sched_scan_interval = 10;
1130                 wpa_s->sched_scan_timeout = max_sched_scan_ssids * 2;
1131                 wpa_s->first_sched_scan = 1;
1132                 ssid = wpa_s->conf->ssid;
1133                 wpa_s->prev_sched_ssid = ssid;
1134         }
1135
1136         if (wildcard) {
1137                 wpa_dbg(wpa_s, MSG_DEBUG, "Add wildcard SSID to sched_scan");
1138                 params.num_ssids++;
1139         }
1140
1141         while (ssid) {
1142                 if (wpas_network_disabled(wpa_s, ssid))
1143                         goto next;
1144
1145                 if (params.num_filter_ssids < wpa_s->max_match_sets &&
1146                     params.filter_ssids && ssid->ssid && ssid->ssid_len) {
1147                         wpa_dbg(wpa_s, MSG_DEBUG, "add to filter ssid: %s",
1148                                 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
1149                         os_memcpy(params.filter_ssids[params.num_filter_ssids].ssid,
1150                                   ssid->ssid, ssid->ssid_len);
1151                         params.filter_ssids[params.num_filter_ssids].ssid_len =
1152                                 ssid->ssid_len;
1153                         params.num_filter_ssids++;
1154                 } else if (params.filter_ssids && ssid->ssid && ssid->ssid_len)
1155                 {
1156                         wpa_dbg(wpa_s, MSG_DEBUG, "Not enough room for SSID "
1157                                 "filter for sched_scan - drop filter");
1158                         os_free(params.filter_ssids);
1159                         params.filter_ssids = NULL;
1160                         params.num_filter_ssids = 0;
1161                 }
1162
1163                 if (ssid->scan_ssid && ssid->ssid && ssid->ssid_len) {
1164                         if (params.num_ssids == max_sched_scan_ssids)
1165                                 break; /* only room for broadcast SSID */
1166                         wpa_dbg(wpa_s, MSG_DEBUG,
1167                                 "add to active scan ssid: %s",
1168                                 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
1169                         params.ssids[params.num_ssids].ssid =
1170                                 ssid->ssid;
1171                         params.ssids[params.num_ssids].ssid_len =
1172                                 ssid->ssid_len;
1173                         params.num_ssids++;
1174                         if (params.num_ssids >= max_sched_scan_ssids) {
1175                                 wpa_s->prev_sched_ssid = ssid;
1176                                 do {
1177                                         ssid = ssid->next;
1178                                 } while (ssid &&
1179                                          (wpas_network_disabled(wpa_s, ssid) ||
1180                                           !ssid->scan_ssid));
1181                                 break;
1182                         }
1183                 }
1184
1185         next:
1186                 wpa_s->prev_sched_ssid = ssid;
1187                 ssid = ssid->next;
1188         }
1189
1190         if (params.num_filter_ssids == 0) {
1191                 os_free(params.filter_ssids);
1192                 params.filter_ssids = NULL;
1193         }
1194
1195         extra_ie = wpa_supplicant_extra_ies(wpa_s);
1196         if (extra_ie) {
1197                 params.extra_ies = wpabuf_head(extra_ie);
1198                 params.extra_ies_len = wpabuf_len(extra_ie);
1199         }
1200
1201         if (wpa_s->conf->filter_rssi)
1202                 params.filter_rssi = wpa_s->conf->filter_rssi;
1203
1204         scan_params = &params;
1205
1206 scan:
1207         if (ssid || !wpa_s->first_sched_scan) {
1208                 wpa_dbg(wpa_s, MSG_DEBUG,
1209                         "Starting sched scan: interval %d timeout %d",
1210                         wpa_s->sched_scan_interval, wpa_s->sched_scan_timeout);
1211         } else {
1212                 wpa_dbg(wpa_s, MSG_DEBUG,
1213                         "Starting sched scan: interval %d (no timeout)",
1214                         wpa_s->sched_scan_interval);
1215         }
1216
1217         wpa_setband_scan_freqs(wpa_s, scan_params);
1218
1219         ret = wpa_supplicant_start_sched_scan(wpa_s, scan_params,
1220                                               wpa_s->sched_scan_interval);
1221         wpabuf_free(extra_ie);
1222         os_free(params.filter_ssids);
1223         if (ret) {
1224                 wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate sched scan");
1225                 if (prev_state != wpa_s->wpa_state)
1226                         wpa_supplicant_set_state(wpa_s, prev_state);
1227                 return ret;
1228         }
1229
1230         /* If we have more SSIDs to scan, add a timeout so we scan them too */
1231         if (ssid || !wpa_s->first_sched_scan) {
1232                 wpa_s->sched_scan_timed_out = 0;
1233                 eloop_register_timeout(wpa_s->sched_scan_timeout, 0,
1234                                        wpa_supplicant_sched_scan_timeout,
1235                                        wpa_s, NULL);
1236                 wpa_s->first_sched_scan = 0;
1237                 wpa_s->sched_scan_timeout /= 2;
1238                 wpa_s->sched_scan_interval *= 2;
1239                 if (wpa_s->sched_scan_timeout < wpa_s->sched_scan_interval) {
1240                         wpa_s->sched_scan_interval = 10;
1241                         wpa_s->sched_scan_timeout = max_sched_scan_ssids * 2;
1242                 }
1243         }
1244
1245         /* If there is no more ssids, start next time from the beginning */
1246         if (!ssid)
1247                 wpa_s->prev_sched_ssid = NULL;
1248
1249         return 0;
1250 }
1251
1252
1253 /**
1254  * wpa_supplicant_cancel_scan - Cancel a scheduled scan request
1255  * @wpa_s: Pointer to wpa_supplicant data
1256  *
1257  * This function is used to cancel a scan request scheduled with
1258  * wpa_supplicant_req_scan().
1259  */
1260 void wpa_supplicant_cancel_scan(struct wpa_supplicant *wpa_s)
1261 {
1262         wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling scan request");
1263         eloop_cancel_timeout(wpa_supplicant_scan, wpa_s, NULL);
1264 }
1265
1266
1267 /**
1268  * wpa_supplicant_cancel_delayed_sched_scan - Stop a delayed scheduled scan
1269  * @wpa_s: Pointer to wpa_supplicant data
1270  *
1271  * This function is used to stop a delayed scheduled scan.
1272  */
1273 void wpa_supplicant_cancel_delayed_sched_scan(struct wpa_supplicant *wpa_s)
1274 {
1275         if (!wpa_s->sched_scan_supported)
1276                 return;
1277
1278         wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling delayed sched scan");
1279         eloop_cancel_timeout(wpa_supplicant_delayed_sched_scan_timeout,
1280                              wpa_s, NULL);
1281 }
1282
1283
1284 /**
1285  * wpa_supplicant_cancel_sched_scan - Stop running scheduled scans
1286  * @wpa_s: Pointer to wpa_supplicant data
1287  *
1288  * This function is used to stop a periodic scheduled scan.
1289  */
1290 void wpa_supplicant_cancel_sched_scan(struct wpa_supplicant *wpa_s)
1291 {
1292         if (!wpa_s->sched_scanning)
1293                 return;
1294
1295         wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling sched scan");
1296         eloop_cancel_timeout(wpa_supplicant_sched_scan_timeout, wpa_s, NULL);
1297         wpa_supplicant_stop_sched_scan(wpa_s);
1298 }
1299
1300
1301 /**
1302  * wpa_supplicant_notify_scanning - Indicate possible scan state change
1303  * @wpa_s: Pointer to wpa_supplicant data
1304  * @scanning: Whether scanning is currently in progress
1305  *
1306  * This function is to generate scanning notifycations. It is called whenever
1307  * there may have been a change in scanning (scan started, completed, stopped).
1308  * wpas_notify_scanning() is called whenever the scanning state changed from the
1309  * previously notified state.
1310  */
1311 void wpa_supplicant_notify_scanning(struct wpa_supplicant *wpa_s,
1312                                     int scanning)
1313 {
1314         if (wpa_s->scanning != scanning) {
1315                 wpa_s->scanning = scanning;
1316                 wpas_notify_scanning(wpa_s);
1317         }
1318 }
1319
1320
1321 static int wpa_scan_get_max_rate(const struct wpa_scan_res *res)
1322 {
1323         int rate = 0;
1324         const u8 *ie;
1325         int i;
1326
1327         ie = wpa_scan_get_ie(res, WLAN_EID_SUPP_RATES);
1328         for (i = 0; ie && i < ie[1]; i++) {
1329                 if ((ie[i + 2] & 0x7f) > rate)
1330                         rate = ie[i + 2] & 0x7f;
1331         }
1332
1333         ie = wpa_scan_get_ie(res, WLAN_EID_EXT_SUPP_RATES);
1334         for (i = 0; ie && i < ie[1]; i++) {
1335                 if ((ie[i + 2] & 0x7f) > rate)
1336                         rate = ie[i + 2] & 0x7f;
1337         }
1338
1339         return rate;
1340 }
1341
1342
1343 /**
1344  * wpa_scan_get_ie - Fetch a specified information element from a scan result
1345  * @res: Scan result entry
1346  * @ie: Information element identitifier (WLAN_EID_*)
1347  * Returns: Pointer to the information element (id field) or %NULL if not found
1348  *
1349  * This function returns the first matching information element in the scan
1350  * result.
1351  */
1352 const u8 * wpa_scan_get_ie(const struct wpa_scan_res *res, u8 ie)
1353 {
1354         const u8 *end, *pos;
1355
1356         pos = (const u8 *) (res + 1);
1357         end = pos + res->ie_len;
1358
1359         while (pos + 1 < end) {
1360                 if (pos + 2 + pos[1] > end)
1361                         break;
1362                 if (pos[0] == ie)
1363                         return pos;
1364                 pos += 2 + pos[1];
1365         }
1366
1367         return NULL;
1368 }
1369
1370
1371 /**
1372  * wpa_scan_get_vendor_ie - Fetch vendor information element from a scan result
1373  * @res: Scan result entry
1374  * @vendor_type: Vendor type (four octets starting the IE payload)
1375  * Returns: Pointer to the information element (id field) or %NULL if not found
1376  *
1377  * This function returns the first matching information element in the scan
1378  * result.
1379  */
1380 const u8 * wpa_scan_get_vendor_ie(const struct wpa_scan_res *res,
1381                                   u32 vendor_type)
1382 {
1383         const u8 *end, *pos;
1384
1385         pos = (const u8 *) (res + 1);
1386         end = pos + res->ie_len;
1387
1388         while (pos + 1 < end) {
1389                 if (pos + 2 + pos[1] > end)
1390                         break;
1391                 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1392                     vendor_type == WPA_GET_BE32(&pos[2]))
1393                         return pos;
1394                 pos += 2 + pos[1];
1395         }
1396
1397         return NULL;
1398 }
1399
1400
1401 /**
1402  * wpa_scan_get_vendor_ie_beacon - Fetch vendor information from a scan result
1403  * @res: Scan result entry
1404  * @vendor_type: Vendor type (four octets starting the IE payload)
1405  * Returns: Pointer to the information element (id field) or %NULL if not found
1406  *
1407  * This function returns the first matching information element in the scan
1408  * result.
1409  *
1410  * This function is like wpa_scan_get_vendor_ie(), but uses IE buffer only
1411  * from Beacon frames instead of either Beacon or Probe Response frames.
1412  */
1413 const u8 * wpa_scan_get_vendor_ie_beacon(const struct wpa_scan_res *res,
1414                                          u32 vendor_type)
1415 {
1416         const u8 *end, *pos;
1417
1418         if (res->beacon_ie_len == 0)
1419                 return NULL;
1420
1421         pos = (const u8 *) (res + 1);
1422         pos += res->ie_len;
1423         end = pos + res->beacon_ie_len;
1424
1425         while (pos + 1 < end) {
1426                 if (pos + 2 + pos[1] > end)
1427                         break;
1428                 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1429                     vendor_type == WPA_GET_BE32(&pos[2]))
1430                         return pos;
1431                 pos += 2 + pos[1];
1432         }
1433
1434         return NULL;
1435 }
1436
1437
1438 /**
1439  * wpa_scan_get_vendor_ie_multi - Fetch vendor IE data from a scan result
1440  * @res: Scan result entry
1441  * @vendor_type: Vendor type (four octets starting the IE payload)
1442  * Returns: Pointer to the information element payload or %NULL if not found
1443  *
1444  * This function returns concatenated payload of possibly fragmented vendor
1445  * specific information elements in the scan result. The caller is responsible
1446  * for freeing the returned buffer.
1447  */
1448 struct wpabuf * wpa_scan_get_vendor_ie_multi(const struct wpa_scan_res *res,
1449                                              u32 vendor_type)
1450 {
1451         struct wpabuf *buf;
1452         const u8 *end, *pos;
1453
1454         buf = wpabuf_alloc(res->ie_len);
1455         if (buf == NULL)
1456                 return NULL;
1457
1458         pos = (const u8 *) (res + 1);
1459         end = pos + res->ie_len;
1460
1461         while (pos + 1 < end) {
1462                 if (pos + 2 + pos[1] > end)
1463                         break;
1464                 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1465                     vendor_type == WPA_GET_BE32(&pos[2]))
1466                         wpabuf_put_data(buf, pos + 2 + 4, pos[1] - 4);
1467                 pos += 2 + pos[1];
1468         }
1469
1470         if (wpabuf_len(buf) == 0) {
1471                 wpabuf_free(buf);
1472                 buf = NULL;
1473         }
1474
1475         return buf;
1476 }
1477
1478
1479 /*
1480  * Channels with a great SNR can operate at full rate. What is a great SNR?
1481  * This doc https://supportforums.cisco.com/docs/DOC-12954 says, "the general
1482  * rule of thumb is that any SNR above 20 is good." This one
1483  * http://www.cisco.com/en/US/tech/tk722/tk809/technologies_q_and_a_item09186a00805e9a96.shtml#qa23
1484  * recommends 25 as a minimum SNR for 54 Mbps data rate. 30 is chosen here as a
1485  * conservative value.
1486  */
1487 #define GREAT_SNR 30
1488
1489 /* Compare function for sorting scan results. Return >0 if @b is considered
1490  * better. */
1491 static int wpa_scan_result_compar(const void *a, const void *b)
1492 {
1493 #define IS_5GHZ(n) (n > 4000)
1494 #define MIN(a,b) a < b ? a : b
1495         struct wpa_scan_res **_wa = (void *) a;
1496         struct wpa_scan_res **_wb = (void *) b;
1497         struct wpa_scan_res *wa = *_wa;
1498         struct wpa_scan_res *wb = *_wb;
1499         int wpa_a, wpa_b, maxrate_a, maxrate_b;
1500         int snr_a, snr_b;
1501
1502         /* WPA/WPA2 support preferred */
1503         wpa_a = wpa_scan_get_vendor_ie(wa, WPA_IE_VENDOR_TYPE) != NULL ||
1504                 wpa_scan_get_ie(wa, WLAN_EID_RSN) != NULL;
1505         wpa_b = wpa_scan_get_vendor_ie(wb, WPA_IE_VENDOR_TYPE) != NULL ||
1506                 wpa_scan_get_ie(wb, WLAN_EID_RSN) != NULL;
1507
1508         if (wpa_b && !wpa_a)
1509                 return 1;
1510         if (!wpa_b && wpa_a)
1511                 return -1;
1512
1513         /* privacy support preferred */
1514         if ((wa->caps & IEEE80211_CAP_PRIVACY) == 0 &&
1515             (wb->caps & IEEE80211_CAP_PRIVACY))
1516                 return 1;
1517         if ((wa->caps & IEEE80211_CAP_PRIVACY) &&
1518             (wb->caps & IEEE80211_CAP_PRIVACY) == 0)
1519                 return -1;
1520
1521         if ((wa->flags & wb->flags & WPA_SCAN_LEVEL_DBM) &&
1522             !((wa->flags | wb->flags) & WPA_SCAN_NOISE_INVALID)) {
1523                 snr_a = MIN(wa->level - wa->noise, GREAT_SNR);
1524                 snr_b = MIN(wb->level - wb->noise, GREAT_SNR);
1525         } else {
1526                 /* Not suitable information to calculate SNR, so use level */
1527                 snr_a = wa->level;
1528                 snr_b = wb->level;
1529         }
1530
1531         /* best/max rate preferred if SNR close enough */
1532         if ((snr_a && snr_b && abs(snr_b - snr_a) < 5) ||
1533             (wa->qual && wb->qual && abs(wb->qual - wa->qual) < 10)) {
1534                 maxrate_a = wpa_scan_get_max_rate(wa);
1535                 maxrate_b = wpa_scan_get_max_rate(wb);
1536                 if (maxrate_a != maxrate_b)
1537                         return maxrate_b - maxrate_a;
1538                 if (IS_5GHZ(wa->freq) ^ IS_5GHZ(wb->freq))
1539                         return IS_5GHZ(wa->freq) ? -1 : 1;
1540         }
1541
1542         /* use freq for channel preference */
1543
1544         /* all things being equal, use SNR; if SNRs are
1545          * identical, use quality values since some drivers may only report
1546          * that value and leave the signal level zero */
1547         if (snr_b == snr_a)
1548                 return wb->qual - wa->qual;
1549         return snr_b - snr_a;
1550 #undef MIN
1551 #undef IS_5GHZ
1552 }
1553
1554
1555 #ifdef CONFIG_WPS
1556 /* Compare function for sorting scan results when searching a WPS AP for
1557  * provisioning. Return >0 if @b is considered better. */
1558 static int wpa_scan_result_wps_compar(const void *a, const void *b)
1559 {
1560         struct wpa_scan_res **_wa = (void *) a;
1561         struct wpa_scan_res **_wb = (void *) b;
1562         struct wpa_scan_res *wa = *_wa;
1563         struct wpa_scan_res *wb = *_wb;
1564         int uses_wps_a, uses_wps_b;
1565         struct wpabuf *wps_a, *wps_b;
1566         int res;
1567
1568         /* Optimization - check WPS IE existence before allocated memory and
1569          * doing full reassembly. */
1570         uses_wps_a = wpa_scan_get_vendor_ie(wa, WPS_IE_VENDOR_TYPE) != NULL;
1571         uses_wps_b = wpa_scan_get_vendor_ie(wb, WPS_IE_VENDOR_TYPE) != NULL;
1572         if (uses_wps_a && !uses_wps_b)
1573                 return -1;
1574         if (!uses_wps_a && uses_wps_b)
1575                 return 1;
1576
1577         if (uses_wps_a && uses_wps_b) {
1578                 wps_a = wpa_scan_get_vendor_ie_multi(wa, WPS_IE_VENDOR_TYPE);
1579                 wps_b = wpa_scan_get_vendor_ie_multi(wb, WPS_IE_VENDOR_TYPE);
1580                 res = wps_ap_priority_compar(wps_a, wps_b);
1581                 wpabuf_free(wps_a);
1582                 wpabuf_free(wps_b);
1583                 if (res)
1584                         return res;
1585         }
1586
1587         /*
1588          * Do not use current AP security policy as a sorting criteria during
1589          * WPS provisioning step since the AP may get reconfigured at the
1590          * completion of provisioning.
1591          */
1592
1593         /* all things being equal, use signal level; if signal levels are
1594          * identical, use quality values since some drivers may only report
1595          * that value and leave the signal level zero */
1596         if (wb->level == wa->level)
1597                 return wb->qual - wa->qual;
1598         return wb->level - wa->level;
1599 }
1600 #endif /* CONFIG_WPS */
1601
1602
1603 static void dump_scan_res(struct wpa_scan_results *scan_res)
1604 {
1605 #ifndef CONFIG_NO_STDOUT_DEBUG
1606         size_t i;
1607
1608         if (scan_res->res == NULL || scan_res->num == 0)
1609                 return;
1610
1611         wpa_printf(MSG_EXCESSIVE, "Sorted scan results");
1612
1613         for (i = 0; i < scan_res->num; i++) {
1614                 struct wpa_scan_res *r = scan_res->res[i];
1615                 u8 *pos;
1616                 if ((r->flags & (WPA_SCAN_LEVEL_DBM | WPA_SCAN_NOISE_INVALID))
1617                     == WPA_SCAN_LEVEL_DBM) {
1618                         int snr = r->level - r->noise;
1619                         wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d "
1620                                    "noise=%d level=%d snr=%d%s flags=0x%x "
1621                                    "age=%u",
1622                                    MAC2STR(r->bssid), r->freq, r->qual,
1623                                    r->noise, r->level, snr,
1624                                    snr >= GREAT_SNR ? "*" : "", r->flags,
1625                                    r->age);
1626                 } else {
1627                         wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d "
1628                                    "noise=%d level=%d flags=0x%x age=%u",
1629                                    MAC2STR(r->bssid), r->freq, r->qual,
1630                                    r->noise, r->level, r->flags, r->age);
1631                 }
1632                 pos = (u8 *) (r + 1);
1633                 if (r->ie_len)
1634                         wpa_hexdump(MSG_EXCESSIVE, "IEs", pos, r->ie_len);
1635                 pos += r->ie_len;
1636                 if (r->beacon_ie_len)
1637                         wpa_hexdump(MSG_EXCESSIVE, "Beacon IEs",
1638                                     pos, r->beacon_ie_len);
1639         }
1640 #endif /* CONFIG_NO_STDOUT_DEBUG */
1641 }
1642
1643
1644 /**
1645  * wpa_supplicant_filter_bssid_match - Is the specified BSSID allowed
1646  * @wpa_s: Pointer to wpa_supplicant data
1647  * @bssid: BSSID to check
1648  * Returns: 0 if the BSSID is filtered or 1 if not
1649  *
1650  * This function is used to filter out specific BSSIDs from scan reslts mainly
1651  * for testing purposes (SET bssid_filter ctrl_iface command).
1652  */
1653 int wpa_supplicant_filter_bssid_match(struct wpa_supplicant *wpa_s,
1654                                       const u8 *bssid)
1655 {
1656         size_t i;
1657
1658         if (wpa_s->bssid_filter == NULL)
1659                 return 1;
1660
1661         for (i = 0; i < wpa_s->bssid_filter_count; i++) {
1662                 if (os_memcmp(wpa_s->bssid_filter + i * ETH_ALEN, bssid,
1663                               ETH_ALEN) == 0)
1664                         return 1;
1665         }
1666
1667         return 0;
1668 }
1669
1670
1671 static void filter_scan_res(struct wpa_supplicant *wpa_s,
1672                             struct wpa_scan_results *res)
1673 {
1674         size_t i, j;
1675
1676         if (wpa_s->bssid_filter == NULL)
1677                 return;
1678
1679         for (i = 0, j = 0; i < res->num; i++) {
1680                 if (wpa_supplicant_filter_bssid_match(wpa_s,
1681                                                       res->res[i]->bssid)) {
1682                         res->res[j++] = res->res[i];
1683                 } else {
1684                         os_free(res->res[i]);
1685                         res->res[i] = NULL;
1686                 }
1687         }
1688
1689         if (res->num != j) {
1690                 wpa_printf(MSG_DEBUG, "Filtered out %d scan results",
1691                            (int) (res->num - j));
1692                 res->num = j;
1693         }
1694 }
1695
1696
1697 /**
1698  * wpa_supplicant_get_scan_results - Get scan results
1699  * @wpa_s: Pointer to wpa_supplicant data
1700  * @info: Information about what was scanned or %NULL if not available
1701  * @new_scan: Whether a new scan was performed
1702  * Returns: Scan results, %NULL on failure
1703  *
1704  * This function request the current scan results from the driver and updates
1705  * the local BSS list wpa_s->bss. The caller is responsible for freeing the
1706  * results with wpa_scan_results_free().
1707  */
1708 struct wpa_scan_results *
1709 wpa_supplicant_get_scan_results(struct wpa_supplicant *wpa_s,
1710                                 struct scan_info *info, int new_scan)
1711 {
1712         struct wpa_scan_results *scan_res;
1713         size_t i;
1714         int (*compar)(const void *, const void *) = wpa_scan_result_compar;
1715
1716         scan_res = wpa_drv_get_scan_results2(wpa_s);
1717         if (scan_res == NULL) {
1718                 wpa_dbg(wpa_s, MSG_DEBUG, "Failed to get scan results");
1719                 return NULL;
1720         }
1721         if (scan_res->fetch_time.sec == 0) {
1722                 /*
1723                  * Make sure we have a valid timestamp if the driver wrapper
1724                  * does not set this.
1725                  */
1726                 os_get_reltime(&scan_res->fetch_time);
1727         }
1728         filter_scan_res(wpa_s, scan_res);
1729
1730 #ifdef CONFIG_WPS
1731         if (wpas_wps_searching(wpa_s)) {
1732                 wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Order scan results with WPS "
1733                         "provisioning rules");
1734                 compar = wpa_scan_result_wps_compar;
1735         }
1736 #endif /* CONFIG_WPS */
1737
1738         qsort(scan_res->res, scan_res->num, sizeof(struct wpa_scan_res *),
1739               compar);
1740         dump_scan_res(scan_res);
1741
1742         wpa_bss_update_start(wpa_s);
1743         for (i = 0; i < scan_res->num; i++)
1744                 wpa_bss_update_scan_res(wpa_s, scan_res->res[i],
1745                                         &scan_res->fetch_time);
1746         wpa_bss_update_end(wpa_s, info, new_scan);
1747
1748         return scan_res;
1749 }
1750
1751
1752 /**
1753  * wpa_supplicant_update_scan_results - Update scan results from the driver
1754  * @wpa_s: Pointer to wpa_supplicant data
1755  * Returns: 0 on success, -1 on failure
1756  *
1757  * This function updates the BSS table within wpa_supplicant based on the
1758  * currently available scan results from the driver without requesting a new
1759  * scan. This is used in cases where the driver indicates an association
1760  * (including roaming within ESS) and wpa_supplicant does not yet have the
1761  * needed information to complete the connection (e.g., to perform validation
1762  * steps in 4-way handshake).
1763  */
1764 int wpa_supplicant_update_scan_results(struct wpa_supplicant *wpa_s)
1765 {
1766         struct wpa_scan_results *scan_res;
1767         scan_res = wpa_supplicant_get_scan_results(wpa_s, NULL, 0);
1768         if (scan_res == NULL)
1769                 return -1;
1770         wpa_scan_results_free(scan_res);
1771
1772         return 0;
1773 }
1774
1775
1776 /**
1777  * scan_only_handler - Reports scan results
1778  */
1779 void scan_only_handler(struct wpa_supplicant *wpa_s,
1780                        struct wpa_scan_results *scan_res)
1781 {
1782         wpa_dbg(wpa_s, MSG_DEBUG, "Scan-only results received");
1783         if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
1784             wpa_s->manual_scan_use_id && wpa_s->own_scan_running) {
1785                 wpa_msg_ctrl(wpa_s, MSG_INFO, WPA_EVENT_SCAN_RESULTS "id=%u",
1786                              wpa_s->manual_scan_id);
1787                 wpa_s->manual_scan_use_id = 0;
1788         } else {
1789                 wpa_msg_ctrl(wpa_s, MSG_INFO, WPA_EVENT_SCAN_RESULTS);
1790         }
1791         wpas_notify_scan_results(wpa_s);
1792         wpas_notify_scan_done(wpa_s, 1);
1793         if (wpa_s->scan_work) {
1794                 struct wpa_radio_work *work = wpa_s->scan_work;
1795                 wpa_s->scan_work = NULL;
1796                 radio_work_done(work);
1797         }
1798 }
1799
1800
1801 int wpas_scan_scheduled(struct wpa_supplicant *wpa_s)
1802 {
1803         return eloop_is_timeout_registered(wpa_supplicant_scan, wpa_s, NULL);
1804 }
1805
1806
1807 struct wpa_driver_scan_params *
1808 wpa_scan_clone_params(const struct wpa_driver_scan_params *src)
1809 {
1810         struct wpa_driver_scan_params *params;
1811         size_t i;
1812         u8 *n;
1813
1814         params = os_zalloc(sizeof(*params));
1815         if (params == NULL)
1816                 return NULL;
1817
1818         for (i = 0; i < src->num_ssids; i++) {
1819                 if (src->ssids[i].ssid) {
1820                         n = os_malloc(src->ssids[i].ssid_len);
1821                         if (n == NULL)
1822                                 goto failed;
1823                         os_memcpy(n, src->ssids[i].ssid,
1824                                   src->ssids[i].ssid_len);
1825                         params->ssids[i].ssid = n;
1826                         params->ssids[i].ssid_len = src->ssids[i].ssid_len;
1827                 }
1828         }
1829         params->num_ssids = src->num_ssids;
1830
1831         if (src->extra_ies) {
1832                 n = os_malloc(src->extra_ies_len);
1833                 if (n == NULL)
1834                         goto failed;
1835                 os_memcpy(n, src->extra_ies, src->extra_ies_len);
1836                 params->extra_ies = n;
1837                 params->extra_ies_len = src->extra_ies_len;
1838         }
1839
1840         if (src->freqs) {
1841                 int len = int_array_len(src->freqs);
1842                 params->freqs = os_malloc((len + 1) * sizeof(int));
1843                 if (params->freqs == NULL)
1844                         goto failed;
1845                 os_memcpy(params->freqs, src->freqs, (len + 1) * sizeof(int));
1846         }
1847
1848         if (src->filter_ssids) {
1849                 params->filter_ssids = os_malloc(sizeof(*params->filter_ssids) *
1850                                                  src->num_filter_ssids);
1851                 if (params->filter_ssids == NULL)
1852                         goto failed;
1853                 os_memcpy(params->filter_ssids, src->filter_ssids,
1854                           sizeof(*params->filter_ssids) *
1855                           src->num_filter_ssids);
1856                 params->num_filter_ssids = src->num_filter_ssids;
1857         }
1858
1859         params->filter_rssi = src->filter_rssi;
1860         params->p2p_probe = src->p2p_probe;
1861         params->only_new_results = src->only_new_results;
1862
1863         return params;
1864
1865 failed:
1866         wpa_scan_free_params(params);
1867         return NULL;
1868 }
1869
1870
1871 void wpa_scan_free_params(struct wpa_driver_scan_params *params)
1872 {
1873         size_t i;
1874
1875         if (params == NULL)
1876                 return;
1877
1878         for (i = 0; i < params->num_ssids; i++)
1879                 os_free((u8 *) params->ssids[i].ssid);
1880         os_free((u8 *) params->extra_ies);
1881         os_free(params->freqs);
1882         os_free(params->filter_ssids);
1883         os_free(params);
1884 }
1885
1886
1887 int wpas_start_pno(struct wpa_supplicant *wpa_s)
1888 {
1889         int ret, interval;
1890         size_t i, num_ssid;
1891         struct wpa_ssid *ssid;
1892         struct wpa_driver_scan_params params;
1893
1894         if (!wpa_s->sched_scan_supported)
1895                 return -1;
1896
1897         if (wpa_s->pno || wpa_s->pno_sched_pending)
1898                 return 0;
1899
1900         if ((wpa_s->wpa_state > WPA_SCANNING) &&
1901             (wpa_s->wpa_state <= WPA_COMPLETED)) {
1902                 wpa_printf(MSG_ERROR, "PNO: In assoc process");
1903                 return -EAGAIN;
1904         }
1905
1906         if (wpa_s->wpa_state == WPA_SCANNING) {
1907                 wpa_supplicant_cancel_scan(wpa_s);
1908                 if (wpa_s->sched_scanning) {
1909                         wpa_printf(MSG_DEBUG, "Schedule PNO on completion of "
1910                                    "ongoing sched scan");
1911                         wpa_supplicant_cancel_sched_scan(wpa_s);
1912                         wpa_s->pno_sched_pending = 1;
1913                         return 0;
1914                 }
1915         }
1916
1917         os_memset(&params, 0, sizeof(params));
1918
1919         num_ssid = 0;
1920         ssid = wpa_s->conf->ssid;
1921         while (ssid) {
1922                 if (!wpas_network_disabled(wpa_s, ssid))
1923                         num_ssid++;
1924                 ssid = ssid->next;
1925         }
1926         if (num_ssid > WPAS_MAX_SCAN_SSIDS) {
1927                 wpa_printf(MSG_DEBUG, "PNO: Use only the first %u SSIDs from "
1928                            "%u", WPAS_MAX_SCAN_SSIDS, (unsigned int) num_ssid);
1929                 num_ssid = WPAS_MAX_SCAN_SSIDS;
1930         }
1931
1932         if (num_ssid == 0) {
1933                 wpa_printf(MSG_DEBUG, "PNO: No configured SSIDs");
1934                 return -1;
1935         }
1936
1937         params.filter_ssids = os_malloc(sizeof(struct wpa_driver_scan_filter) *
1938                                         num_ssid);
1939         if (params.filter_ssids == NULL)
1940                 return -1;
1941         i = 0;
1942         ssid = wpa_s->conf->ssid;
1943         while (ssid) {
1944                 if (!wpas_network_disabled(wpa_s, ssid)) {
1945                         params.ssids[i].ssid = ssid->ssid;
1946                         params.ssids[i].ssid_len = ssid->ssid_len;
1947                         params.num_ssids++;
1948                         os_memcpy(params.filter_ssids[i].ssid, ssid->ssid,
1949                                   ssid->ssid_len);
1950                         params.filter_ssids[i].ssid_len = ssid->ssid_len;
1951                         params.num_filter_ssids++;
1952                         i++;
1953                         if (i == num_ssid)
1954                                 break;
1955                 }
1956                 ssid = ssid->next;
1957         }
1958
1959         if (wpa_s->conf->filter_rssi)
1960                 params.filter_rssi = wpa_s->conf->filter_rssi;
1961
1962         interval = wpa_s->conf->sched_scan_interval ?
1963                 wpa_s->conf->sched_scan_interval : 10;
1964
1965         if (params.freqs == NULL && wpa_s->manual_sched_scan_freqs) {
1966                 wpa_dbg(wpa_s, MSG_DEBUG, "Limit sched scan to specified channels");
1967                 params.freqs = wpa_s->manual_sched_scan_freqs;
1968         }
1969
1970         ret = wpa_supplicant_start_sched_scan(wpa_s, &params, interval);
1971         os_free(params.filter_ssids);
1972         if (ret == 0)
1973                 wpa_s->pno = 1;
1974         else
1975                 wpa_msg(wpa_s, MSG_ERROR, "Failed to schedule PNO");
1976         return ret;
1977 }
1978
1979
1980 int wpas_stop_pno(struct wpa_supplicant *wpa_s)
1981 {
1982         int ret = 0;
1983
1984         if (!wpa_s->pno)
1985                 return 0;
1986
1987         ret = wpa_supplicant_stop_sched_scan(wpa_s);
1988
1989         wpa_s->pno = 0;
1990         wpa_s->pno_sched_pending = 0;
1991
1992         if (wpa_s->wpa_state == WPA_SCANNING)
1993                 wpa_supplicant_req_scan(wpa_s, 0, 0);
1994
1995         return ret;
1996 }