wpa_supplicant/scan.c

   1 /*
   2  * WPA Supplicant - Scanning
   3  * Copyright (c) 2003-2014, Jouni Malinen <j@w1.fi>
   4  *
   5  * This software may be distributed under the terms of the BSD license.
   6  * See README for more details.
   7  */
   8
   9 #include "utils/includes.h"
  10
  11 #include "utils/common.h"
  12 #include "utils/eloop.h"
  13 #include "common/ieee802_11_defs.h"
  14 #include "common/wpa_ctrl.h"
  15 #include "config.h"
  16 #include "wpa_supplicant_i.h"
  17 #include "driver_i.h"
  18 #include "wps_supplicant.h"
  19 #include "p2p_supplicant.h"
  20 #include "p2p/p2p.h"
  21 #include "hs20_supplicant.h"
  22 #include "notify.h"
  23 #include "bss.h"
  24 #include "scan.h"
  25 #include "mesh.h"
  26
  27
  28 static void wpa_supplicant_gen_assoc_event(struct wpa_supplicant *wpa_s)
  29 {
  30         struct wpa_ssid *ssid;
  31         union wpa_event_data data;
  32
  33         ssid = wpa_supplicant_get_ssid(wpa_s);
  34         if (ssid == NULL)
  35                 return;
  36
  37         if (wpa_s->current_ssid == NULL) {
  38                 wpa_s->current_ssid = ssid;
  39                 if (wpa_s->current_ssid != NULL)
  40                         wpas_notify_network_changed(wpa_s);
  41         }
  42         wpa_supplicant_initiate_eapol(wpa_s);
  43         wpa_dbg(wpa_s, MSG_DEBUG, "Already associated with a configured "
  44                 "network - generating associated event");
  45         os_memset(&data, 0, sizeof(data));
  46         wpa_supplicant_event(wpa_s, EVENT_ASSOC, &data);
  47 }
  48
  49
  50 #ifdef CONFIG_WPS
  51 static int wpas_wps_in_use(struct wpa_supplicant *wpa_s,
  52                            enum wps_request_type *req_type)
  53 {
  54         struct wpa_ssid *ssid;
  55         int wps = 0;
  56
  57         for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
  58                 if (!(ssid->key_mgmt & WPA_KEY_MGMT_WPS))
  59                         continue;
  60
  61                 wps = 1;
  62                 *req_type = wpas_wps_get_req_type(ssid);
  63                 if (!ssid->eap.phase1)
  64                         continue;
  65
  66                 if (os_strstr(ssid->eap.phase1, "pbc=1"))
  67                         return 2;
  68         }
  69
  70 #ifdef CONFIG_P2P
  71         if (!wpa_s->global->p2p_disabled && wpa_s->global->p2p &&
  72             !wpa_s->conf->p2p_disabled) {
  73                 wpa_s->wps->dev.p2p = 1;
  74                 if (!wps) {
  75                         wps = 1;
  76                         *req_type = WPS_REQ_ENROLLEE_INFO;
  77                 }
  78         }
  79 #endif /* CONFIG_P2P */
  80
  81         return wps;
  82 }
  83 #endif /* CONFIG_WPS */
  84
  85
  86 /**
  87  * wpa_supplicant_enabled_networks - Check whether there are enabled networks
  88  * @wpa_s: Pointer to wpa_supplicant data
  89  * Returns: 0 if no networks are enabled, >0 if networks are enabled
  90  *
  91  * This function is used to figure out whether any networks (or Interworking
  92  * with enabled credentials and auto_interworking) are present in the current
  93  * configuration.
  94  */
  95 int wpa_supplicant_enabled_networks(struct wpa_supplicant *wpa_s)
  96 {
  97         struct wpa_ssid *ssid = wpa_s->conf->ssid;
  98         int count = 0, disabled = 0;
  99
 100         if (wpa_s->p2p_mgmt)
 101                 return 0; /* no normal network profiles on p2p_mgmt interface */
 102
 103         while (ssid) {
 104                 if (!wpas_network_disabled(wpa_s, ssid))
 105                         count++;
 106                 else
 107                         disabled++;
 108                 ssid = ssid->next;
 109         }
 110         if (wpa_s->conf->cred && wpa_s->conf->interworking &&
 111             wpa_s->conf->auto_interworking)
 112                 count++;
 113         if (count == 0 && disabled > 0) {
 114                 wpa_dbg(wpa_s, MSG_DEBUG, "No enabled networks (%d disabled "
 115                         "networks)", disabled);
 116         }
 117         return count;
 118 }
 119
 120
 121 static void wpa_supplicant_assoc_try(struct wpa_supplicant *wpa_s,
 122                                      struct wpa_ssid *ssid)
 123 {
 124         while (ssid) {
 125                 if (!wpas_network_disabled(wpa_s, ssid))
 126                         break;
 127                 ssid = ssid->next;
 128         }
 129
 130         /* ap_scan=2 mode - try to associate with each SSID. */
 131         if (ssid == NULL) {
 132                 wpa_dbg(wpa_s, MSG_DEBUG, "wpa_supplicant_assoc_try: Reached "
 133                         "end of scan list - go back to beginning");
 134                 wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
 135                 wpa_supplicant_req_scan(wpa_s, 0, 0);
 136                 return;
 137         }
 138         if (ssid->next) {
 139                 /* Continue from the next SSID on the next attempt. */
 140                 wpa_s->prev_scan_ssid = ssid;
 141         } else {
 142                 /* Start from the beginning of the SSID list. */
 143                 wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
 144         }
 145         wpa_supplicant_associate(wpa_s, NULL, ssid);
 146 }
 147
 148
 149 static void wpas_trigger_scan_cb(struct wpa_radio_work *work, int deinit)
 150 {
 151         struct wpa_supplicant *wpa_s = work->wpa_s;
 152         struct wpa_driver_scan_params *params = work->ctx;
 153         int ret;
 154
 155         if (deinit) {
 156                 if (!work->started) {
 157                         wpa_scan_free_params(params);
 158                         return;
 159                 }
 160                 wpa_supplicant_notify_scanning(wpa_s, 0);
 161                 wpas_notify_scan_done(wpa_s, 0);
 162                 wpa_s->scan_work = NULL;
 163                 return;
 164         }
 165
 166         if (wpas_update_random_addr_disassoc(wpa_s) < 0) {
 167                 wpa_msg(wpa_s, MSG_INFO,
 168                         "Failed to assign random MAC address for a scan");
 169                 radio_work_done(work);
 170                 return;
 171         }
 172
 173         wpa_supplicant_notify_scanning(wpa_s, 1);
 174
 175         if (wpa_s->clear_driver_scan_cache) {
 176                 wpa_printf(MSG_DEBUG,
 177                            "Request driver to clear scan cache due to local BSS flush");
 178                 params->only_new_results = 1;
 179         }
 180         ret = wpa_drv_scan(wpa_s, params);
 181         wpa_scan_free_params(params);
 182         work->ctx = NULL;
 183         if (ret) {
 184                 int retry = wpa_s->last_scan_req != MANUAL_SCAN_REQ;
 185
 186                 if (wpa_s->disconnected)
 187                         retry = 0;
 188
 189                 wpa_supplicant_notify_scanning(wpa_s, 0);
 190                 wpas_notify_scan_done(wpa_s, 0);
 191                 if (wpa_s->wpa_state == WPA_SCANNING)
 192                         wpa_supplicant_set_state(wpa_s,
 193                                                  wpa_s->scan_prev_wpa_state);
 194                 wpa_msg(wpa_s, MSG_INFO, WPA_EVENT_SCAN_FAILED "ret=%d%s",
 195                         ret, retry ? " retry=1" : "");
 196                 radio_work_done(work);
 197
 198                 if (retry) {
 199                         /* Restore scan_req since we will try to scan again */
 200                         wpa_s->scan_req = wpa_s->last_scan_req;
 201                         wpa_supplicant_req_scan(wpa_s, 1, 0);
 202                 }
 203                 return;
 204         }
 205
 206         os_get_reltime(&wpa_s->scan_trigger_time);
 207         wpa_s->scan_runs++;
 208         wpa_s->normal_scans++;
 209         wpa_s->own_scan_requested = 1;
 210         wpa_s->clear_driver_scan_cache = 0;
 211         wpa_s->scan_work = work;
 212 }
 213
 214
 215 /**
 216  * wpa_supplicant_trigger_scan - Request driver to start a scan
 217  * @wpa_s: Pointer to wpa_supplicant data
 218  * @params: Scan parameters
 219  * Returns: 0 on success, -1 on failure
 220  */
 221 int wpa_supplicant_trigger_scan(struct wpa_supplicant *wpa_s,
 222                                 struct wpa_driver_scan_params *params)
 223 {
 224         struct wpa_driver_scan_params *ctx;
 225
 226         if (wpa_s->scan_work) {
 227                 wpa_dbg(wpa_s, MSG_INFO, "Reject scan trigger since one is already pending");
 228                 return -1;
 229         }
 230
 231         ctx = wpa_scan_clone_params(params);
 232         if (ctx == NULL)
 233                 return -1;
 234
 235         if (radio_add_work(wpa_s, 0, "scan", 0, wpas_trigger_scan_cb, ctx) < 0)
 236         {
 237                 wpa_scan_free_params(ctx);
 238                 return -1;
 239         }
 240
 241         return 0;
 242 }
 243
 244
 245 static void
 246 wpa_supplicant_delayed_sched_scan_timeout(void *eloop_ctx, void *timeout_ctx)
 247 {
 248         struct wpa_supplicant *wpa_s = eloop_ctx;
 249
 250         wpa_dbg(wpa_s, MSG_DEBUG, "Starting delayed sched scan");
 251
 252         if (wpa_supplicant_req_sched_scan(wpa_s))
 253                 wpa_supplicant_req_scan(wpa_s, 0, 0);
 254 }
 255
 256
 257 static void
 258 wpa_supplicant_sched_scan_timeout(void *eloop_ctx, void *timeout_ctx)
 259 {
 260         struct wpa_supplicant *wpa_s = eloop_ctx;
 261
 262         wpa_dbg(wpa_s, MSG_DEBUG, "Sched scan timeout - stopping it");
 263
 264         wpa_s->sched_scan_timed_out = 1;
 265         wpa_supplicant_cancel_sched_scan(wpa_s);
 266 }
 267
 268
 269 int wpa_supplicant_start_sched_scan(struct wpa_supplicant *wpa_s,
 270                                     struct wpa_driver_scan_params *params,
 271                                     int interval)
 272 {
 273         int ret;
 274
 275         wpa_supplicant_notify_scanning(wpa_s, 1);
 276         ret = wpa_drv_sched_scan(wpa_s, params, interval * 1000);
 277         if (ret)
 278                 wpa_supplicant_notify_scanning(wpa_s, 0);
 279         else
 280                 wpa_s->sched_scanning = 1;
 281
 282         return ret;
 283 }
 284
 285
 286 int wpa_supplicant_stop_sched_scan(struct wpa_supplicant *wpa_s)
 287 {
 288         int ret;
 289
 290         ret = wpa_drv_stop_sched_scan(wpa_s);
 291         if (ret) {
 292                 wpa_dbg(wpa_s, MSG_DEBUG, "stopping sched_scan failed!");
 293                 /* TODO: what to do if stopping fails? */
 294                 return -1;
 295         }
 296
 297         return ret;
 298 }
 299
 300
 301 static struct wpa_driver_scan_filter *
 302 wpa_supplicant_build_filter_ssids(struct wpa_config *conf, size_t *num_ssids)
 303 {
 304         struct wpa_driver_scan_filter *ssids;
 305         struct wpa_ssid *ssid;
 306         size_t count;
 307
 308         *num_ssids = 0;
 309         if (!conf->filter_ssids)
 310                 return NULL;
 311
 312         for (count = 0, ssid = conf->ssid; ssid; ssid = ssid->next) {
 313                 if (ssid->ssid && ssid->ssid_len)
 314                         count++;
 315         }
 316         if (count == 0)
 317                 return NULL;
 318         ssids = os_calloc(count, sizeof(struct wpa_driver_scan_filter));
 319         if (ssids == NULL)
 320                 return NULL;
 321
 322         for (ssid = conf->ssid; ssid; ssid = ssid->next) {
 323                 if (!ssid->ssid || !ssid->ssid_len)
 324                         continue;
 325                 os_memcpy(ssids[*num_ssids].ssid, ssid->ssid, ssid->ssid_len);
 326                 ssids[*num_ssids].ssid_len = ssid->ssid_len;
 327                 (*num_ssids)++;
 328         }
 329
 330         return ssids;
 331 }
 332
 333
 334 static void wpa_supplicant_optimize_freqs(
 335         struct wpa_supplicant *wpa_s, struct wpa_driver_scan_params *params)
 336 {
 337 #ifdef CONFIG_P2P
 338         if (params->freqs == NULL && wpa_s->p2p_in_provisioning &&
 339             wpa_s->go_params) {
 340                 /* Optimize provisioning state scan based on GO information */
 341                 if (wpa_s->p2p_in_provisioning < 5 &&
 342                     wpa_s->go_params->freq > 0) {
 343                         wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only GO "
 344                                 "preferred frequency %d MHz",
 345                                 wpa_s->go_params->freq);
 346                         params->freqs = os_calloc(2, sizeof(int));
 347                         if (params->freqs)
 348                                 params->freqs[0] = wpa_s->go_params->freq;
 349                 } else if (wpa_s->p2p_in_provisioning < 8 &&
 350                            wpa_s->go_params->freq_list[0]) {
 351                         wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only common "
 352                                 "channels");
 353                         int_array_concat(&params->freqs,
 354                                          wpa_s->go_params->freq_list);
 355                         if (params->freqs)
 356                                 int_array_sort_unique(params->freqs);
 357                 }
 358                 wpa_s->p2p_in_provisioning++;
 359         }
 360
 361         if (params->freqs == NULL && wpa_s->p2p_in_invitation) {
 362                 /*
 363                  * Optimize scan based on GO information during persistent
 364                  * group reinvocation
 365                  */
 366                 if (wpa_s->p2p_in_invitation < 5 &&
 367                     wpa_s->p2p_invite_go_freq > 0) {
 368                         wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only GO preferred frequency %d MHz during invitation",
 369                                 wpa_s->p2p_invite_go_freq);
 370                         params->freqs = os_calloc(2, sizeof(int));
 371                         if (params->freqs)
 372                                 params->freqs[0] = wpa_s->p2p_invite_go_freq;
 373                 }
 374                 wpa_s->p2p_in_invitation++;
 375                 if (wpa_s->p2p_in_invitation > 20) {
 376                         /*
 377                          * This should not really happen since the variable is
 378                          * cleared on group removal, but if it does happen, make
 379                          * sure we do not get stuck in special invitation scan
 380                          * mode.
 381                          */
 382                         wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Clear p2p_in_invitation");
 383                         wpa_s->p2p_in_invitation = 0;
 384                 }
 385         }
 386 #endif /* CONFIG_P2P */
 387
 388 #ifdef CONFIG_WPS
 389         if (params->freqs == NULL && wpa_s->after_wps && wpa_s->wps_freq) {
 390                 /*
 391                  * Optimize post-provisioning scan based on channel used
 392                  * during provisioning.
 393                  */
 394                 wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Scan only frequency %u MHz "
 395                         "that was used during provisioning", wpa_s->wps_freq);
 396                 params->freqs = os_calloc(2, sizeof(int));
 397                 if (params->freqs)
 398                         params->freqs[0] = wpa_s->wps_freq;
 399                 wpa_s->after_wps--;
 400         } else if (wpa_s->after_wps)
 401                 wpa_s->after_wps--;
 402
 403         if (params->freqs == NULL && wpa_s->known_wps_freq && wpa_s->wps_freq)
 404         {
 405                 /* Optimize provisioning scan based on already known channel */
 406                 wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Scan only frequency %u MHz",
 407                         wpa_s->wps_freq);
 408                 params->freqs = os_calloc(2, sizeof(int));
 409                 if (params->freqs)
 410                         params->freqs[0] = wpa_s->wps_freq;
 411                 wpa_s->known_wps_freq = 0; /* only do this once */
 412         }
 413 #endif /* CONFIG_WPS */
 414 }
 415
 416
 417 #ifdef CONFIG_INTERWORKING
 418 static void wpas_add_interworking_elements(struct wpa_supplicant *wpa_s,
 419                                            struct wpabuf *buf)
 420 {
 421         wpabuf_put_u8(buf, WLAN_EID_INTERWORKING);
 422         wpabuf_put_u8(buf, is_zero_ether_addr(wpa_s->conf->hessid) ? 1 :
 423                       1 + ETH_ALEN);
 424         wpabuf_put_u8(buf, wpa_s->conf->access_network_type);
 425         /* No Venue Info */
 426         if (!is_zero_ether_addr(wpa_s->conf->hessid))
 427                 wpabuf_put_data(buf, wpa_s->conf->hessid, ETH_ALEN);
 428 }
 429 #endif /* CONFIG_INTERWORKING */
 430
 431
 432 static struct wpabuf * wpa_supplicant_extra_ies(struct wpa_supplicant *wpa_s)
 433 {
 434         struct wpabuf *extra_ie = NULL;
 435         u8 ext_capab[18];
 436         int ext_capab_len;
 437 #ifdef CONFIG_WPS
 438         int wps = 0;
 439         enum wps_request_type req_type = WPS_REQ_ENROLLEE_INFO;
 440 #endif /* CONFIG_WPS */
 441
 442         ext_capab_len = wpas_build_ext_capab(wpa_s, ext_capab,
 443                                              sizeof(ext_capab));
 444         if (ext_capab_len > 0 &&
 445             wpabuf_resize(&extra_ie, ext_capab_len) == 0)
 446                 wpabuf_put_data(extra_ie, ext_capab, ext_capab_len);
 447
 448 #ifdef CONFIG_INTERWORKING
 449         if (wpa_s->conf->interworking &&
 450             wpabuf_resize(&extra_ie, 100) == 0)
 451                 wpas_add_interworking_elements(wpa_s, extra_ie);
 452 #endif /* CONFIG_INTERWORKING */
 453
 454 #ifdef CONFIG_WPS
 455         wps = wpas_wps_in_use(wpa_s, &req_type);
 456
 457         if (wps) {
 458                 struct wpabuf *wps_ie;
 459                 wps_ie = wps_build_probe_req_ie(wps == 2 ? DEV_PW_PUSHBUTTON :
 460                                                 DEV_PW_DEFAULT,
 461                                                 &wpa_s->wps->dev,
 462                                                 wpa_s->wps->uuid, req_type,
 463                                                 0, NULL);
 464                 if (wps_ie) {
 465                         if (wpabuf_resize(&extra_ie, wpabuf_len(wps_ie)) == 0)
 466                                 wpabuf_put_buf(extra_ie, wps_ie);
 467                         wpabuf_free(wps_ie);
 468                 }
 469         }
 470
 471 #ifdef CONFIG_P2P
 472         if (wps) {
 473                 size_t ielen = p2p_scan_ie_buf_len(wpa_s->global->p2p);
 474                 if (wpabuf_resize(&extra_ie, ielen) == 0)
 475                         wpas_p2p_scan_ie(wpa_s, extra_ie);
 476         }
 477 #endif /* CONFIG_P2P */
 478
 479         wpa_supplicant_mesh_add_scan_ie(wpa_s, &extra_ie);
 480
 481 #endif /* CONFIG_WPS */
 482
 483 #ifdef CONFIG_HS20
 484         if (wpa_s->conf->hs20 && wpabuf_resize(&extra_ie, 7) == 0)
 485                 wpas_hs20_add_indication(extra_ie, -1);
 486 #endif /* CONFIG_HS20 */
 487
 488 #ifdef CONFIG_FST
 489         if (wpa_s->fst_ies &&
 490             wpabuf_resize(&extra_ie, wpabuf_len(wpa_s->fst_ies)) == 0)
 491                 wpabuf_put_buf(extra_ie, wpa_s->fst_ies);
 492 #endif /* CONFIG_FST */
 493
 494         return extra_ie;
 495 }
 496
 497
 498 #ifdef CONFIG_P2P
 499
 500 /*
 501  * Check whether there are any enabled networks or credentials that could be
 502  * used for a non-P2P connection.
 503  */
 504 static int non_p2p_network_enabled(struct wpa_supplicant *wpa_s)
 505 {
 506         struct wpa_ssid *ssid;
 507
 508         for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
 509                 if (wpas_network_disabled(wpa_s, ssid))
 510                         continue;
 511                 if (!ssid->p2p_group)
 512                         return 1;
 513         }
 514
 515         if (wpa_s->conf->cred && wpa_s->conf->interworking &&
 516             wpa_s->conf->auto_interworking)
 517                 return 1;
 518
 519         return 0;
 520 }
 521
 522 #endif /* CONFIG_P2P */
 523
 524
 525 static struct hostapd_hw_modes * get_mode(struct hostapd_hw_modes *modes,
 526                                           u16 num_modes,
 527                                           enum hostapd_hw_mode mode)
 528 {
 529         u16 i;
 530
 531         for (i = 0; i < num_modes; i++) {
 532                 if (modes[i].mode == mode)
 533                         return &modes[i];
 534         }
 535
 536         return NULL;
 537 }
 538
 539
 540 static void wpa_setband_scan_freqs_list(struct wpa_supplicant *wpa_s,
 541                                         enum hostapd_hw_mode band,
 542                                         struct wpa_driver_scan_params *params)
 543 {
 544         /* Include only supported channels for the specified band */
 545         struct hostapd_hw_modes *mode;
 546         int count, i;
 547
 548         mode = get_mode(wpa_s->hw.modes, wpa_s->hw.num_modes, band);
 549         if (mode == NULL) {
 550                 /* No channels supported in this band - use empty list */
 551                 params->freqs = os_zalloc(sizeof(int));
 552                 return;
 553         }
 554
 555         params->freqs = os_calloc(mode->num_channels + 1, sizeof(int));
 556         if (params->freqs == NULL)
 557                 return;
 558         for (count = 0, i = 0; i < mode->num_channels; i++) {
 559                 if (mode->channels[i].flag & HOSTAPD_CHAN_DISABLED)
 560                         continue;
 561                 params->freqs[count++] = mode->channels[i].freq;
 562         }
 563 }
 564
 565
 566 static void wpa_setband_scan_freqs(struct wpa_supplicant *wpa_s,
 567                                    struct wpa_driver_scan_params *params)
 568 {
 569         if (wpa_s->hw.modes == NULL)
 570                 return; /* unknown what channels the driver supports */
 571         if (params->freqs)
 572                 return; /* already using a limited channel set */
 573         if (wpa_s->setband == WPA_SETBAND_5G)
 574                 wpa_setband_scan_freqs_list(wpa_s, HOSTAPD_MODE_IEEE80211A,
 575                                             params);
 576         else if (wpa_s->setband == WPA_SETBAND_2G)
 577                 wpa_setband_scan_freqs_list(wpa_s, HOSTAPD_MODE_IEEE80211G,
 578                                             params);
 579 }
 580
 581
 582 static void wpa_set_scan_ssids(struct wpa_supplicant *wpa_s,
 583                                struct wpa_driver_scan_params *params,
 584                                size_t max_ssids)
 585 {
 586         unsigned int i;
 587         struct wpa_ssid *ssid;
 588
 589         for (i = 0; i < wpa_s->scan_id_count; i++) {
 590                 unsigned int j;
 591
 592                 ssid = wpa_config_get_network(wpa_s->conf, wpa_s->scan_id[i]);
 593                 if (!ssid || !ssid->scan_ssid)
 594                         continue;
 595
 596                 for (j = 0; j < params->num_ssids; j++) {
 597                         if (params->ssids[j].ssid_len == ssid->ssid_len &&
 598                             params->ssids[j].ssid &&
 599                             os_memcmp(params->ssids[j].ssid, ssid->ssid,
 600                                       ssid->ssid_len) == 0)
 601                                 break;
 602                 }
 603                 if (j < params->num_ssids)
 604                         continue; /* already in the list */
 605
 606                 if (params->num_ssids + 1 > max_ssids) {
 607                         wpa_printf(MSG_DEBUG,
 608                                    "Over max scan SSIDs for manual request");
 609                         break;
 610                 }
 611
 612                 wpa_printf(MSG_DEBUG, "Scan SSID (manual request): %s",
 613                            wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
 614                 params->ssids[params->num_ssids].ssid = ssid->ssid;
 615                 params->ssids[params->num_ssids].ssid_len = ssid->ssid_len;
 616                 params->num_ssids++;
 617         }
 618
 619         wpa_s->scan_id_count = 0;
 620 }
 621
 622
 623 static int wpa_set_ssids_from_scan_req(struct wpa_supplicant *wpa_s,
 624                                        struct wpa_driver_scan_params *params,
 625                                        size_t max_ssids)
 626 {
 627         unsigned int i;
 628
 629         if (wpa_s->ssids_from_scan_req == NULL ||
 630             wpa_s->num_ssids_from_scan_req == 0)
 631                 return 0;
 632
 633         if (wpa_s->num_ssids_from_scan_req > max_ssids) {
 634                 wpa_s->num_ssids_from_scan_req = max_ssids;
 635                 wpa_printf(MSG_DEBUG, "Over max scan SSIDs from scan req: %u",
 636                            (unsigned int) max_ssids);
 637         }
 638
 639         for (i = 0; i < wpa_s->num_ssids_from_scan_req; i++) {
 640                 params->ssids[i].ssid = wpa_s->ssids_from_scan_req[i].ssid;
 641                 params->ssids[i].ssid_len =
 642                         wpa_s->ssids_from_scan_req[i].ssid_len;
 643                 wpa_hexdump_ascii(MSG_DEBUG, "specific SSID",
 644                                   params->ssids[i].ssid,
 645                                   params->ssids[i].ssid_len);
 646         }
 647
 648         params->num_ssids = wpa_s->num_ssids_from_scan_req;
 649         wpa_s->num_ssids_from_scan_req = 0;
 650         return 1;
 651 }
 652
 653
 654 static void wpa_supplicant_scan(void *eloop_ctx, void *timeout_ctx)
 655 {
 656         struct wpa_supplicant *wpa_s = eloop_ctx;
 657         struct wpa_ssid *ssid;
 658         int ret, p2p_in_prog;
 659         struct wpabuf *extra_ie = NULL;
 660         struct wpa_driver_scan_params params;
 661         struct wpa_driver_scan_params *scan_params;
 662         size_t max_ssids;
 663         int connect_without_scan = 0;
 664
 665         if (wpa_s->pno || wpa_s->pno_sched_pending) {
 666                 wpa_dbg(wpa_s, MSG_DEBUG, "Skip scan - PNO is in progress");
 667                 return;
 668         }
 669
 670         if (wpa_s->wpa_state == WPA_INTERFACE_DISABLED) {
 671                 wpa_dbg(wpa_s, MSG_DEBUG, "Skip scan - interface disabled");
 672                 return;
 673         }
 674
 675         if (wpa_s->disconnected && wpa_s->scan_req == NORMAL_SCAN_REQ) {
 676                 wpa_dbg(wpa_s, MSG_DEBUG, "Disconnected - do not scan");
 677                 wpa_supplicant_set_state(wpa_s, WPA_DISCONNECTED);
 678                 return;
 679         }
 680
 681         if (wpa_s->scanning) {
 682                 /*
 683                  * If we are already in scanning state, we shall reschedule the
 684                  * the incoming scan request.
 685                  */
 686                 wpa_dbg(wpa_s, MSG_DEBUG, "Already scanning - Reschedule the incoming scan req");
 687                 wpa_supplicant_req_scan(wpa_s, 1, 0);
 688                 return;
 689         }
 690
 691         if (!wpa_supplicant_enabled_networks(wpa_s) &&
 692             wpa_s->scan_req == NORMAL_SCAN_REQ) {
 693                 wpa_dbg(wpa_s, MSG_DEBUG, "No enabled networks - do not scan");
 694                 wpa_supplicant_set_state(wpa_s, WPA_INACTIVE);
 695                 return;
 696         }
 697
 698         if (wpa_s->conf->ap_scan != 0 &&
 699             (wpa_s->drv_flags & WPA_DRIVER_FLAGS_WIRED)) {
 700                 wpa_dbg(wpa_s, MSG_DEBUG, "Using wired authentication - "
 701                         "overriding ap_scan configuration");
 702                 wpa_s->conf->ap_scan = 0;
 703                 wpas_notify_ap_scan_changed(wpa_s);
 704         }
 705
 706         if (wpa_s->conf->ap_scan == 0) {
 707                 wpa_supplicant_gen_assoc_event(wpa_s);
 708                 return;
 709         }
 710
 711         ssid = NULL;
 712         if (wpa_s->scan_req != MANUAL_SCAN_REQ &&
 713             wpa_s->connect_without_scan) {
 714                 connect_without_scan = 1;
 715                 for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
 716                         if (ssid == wpa_s->connect_without_scan)
 717                                 break;
 718                 }
 719         }
 720
 721         p2p_in_prog = wpas_p2p_in_progress(wpa_s);
 722         if (p2p_in_prog && p2p_in_prog != 2 &&
 723             (!ssid ||
 724              (ssid->mode != WPAS_MODE_AP && ssid->mode != WPAS_MODE_P2P_GO))) {
 725                 wpa_dbg(wpa_s, MSG_DEBUG, "Delay station mode scan while P2P operation is in progress");
 726                 wpa_supplicant_req_scan(wpa_s, 5, 0);
 727                 return;
 728         }
 729
 730         if (wpa_s->conf->ap_scan == 2)
 731                 max_ssids = 1;
 732         else {
 733                 max_ssids = wpa_s->max_scan_ssids;
 734                 if (max_ssids > WPAS_MAX_SCAN_SSIDS)
 735                         max_ssids = WPAS_MAX_SCAN_SSIDS;
 736         }
 737
 738         wpa_s->last_scan_req = wpa_s->scan_req;
 739         wpa_s->scan_req = NORMAL_SCAN_REQ;
 740
 741         if (connect_without_scan) {
 742                 wpa_s->connect_without_scan = NULL;
 743                 if (ssid) {
 744                         wpa_printf(MSG_DEBUG, "Start a pre-selected network "
 745                                    "without scan step");
 746                         wpa_supplicant_associate(wpa_s, NULL, ssid);
 747                         return;
 748                 }
 749         }
 750
 751         os_memset(&params, 0, sizeof(params));
 752
 753         wpa_s->scan_prev_wpa_state = wpa_s->wpa_state;
 754         if (wpa_s->wpa_state == WPA_DISCONNECTED ||
 755             wpa_s->wpa_state == WPA_INACTIVE)
 756                 wpa_supplicant_set_state(wpa_s, WPA_SCANNING);
 757
 758         /*
 759          * If autoscan has set its own scanning parameters
 760          */
 761         if (wpa_s->autoscan_params != NULL) {
 762                 scan_params = wpa_s->autoscan_params;
 763                 goto scan;
 764         }
 765
 766         if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
 767             wpa_set_ssids_from_scan_req(wpa_s, &params, max_ssids)) {
 768                 wpa_printf(MSG_DEBUG, "Use specific SSIDs from SCAN command");
 769                 goto ssid_list_set;
 770         }
 771
 772 #ifdef CONFIG_P2P
 773         if ((wpa_s->p2p_in_provisioning || wpa_s->show_group_started) &&
 774             wpa_s->go_params && !wpa_s->conf->passive_scan) {
 775                 wpa_printf(MSG_DEBUG, "P2P: Use specific SSID for scan during P2P group formation (p2p_in_provisioning=%d show_group_started=%d)",
 776                            wpa_s->p2p_in_provisioning,
 777                            wpa_s->show_group_started);
 778                 params.ssids[0].ssid = wpa_s->go_params->ssid;
 779                 params.ssids[0].ssid_len = wpa_s->go_params->ssid_len;
 780                 params.num_ssids = 1;
 781                 goto ssid_list_set;
 782         }
 783
 784         if (wpa_s->p2p_in_invitation) {
 785                 if (wpa_s->current_ssid) {
 786                         wpa_printf(MSG_DEBUG, "P2P: Use specific SSID for scan during invitation");
 787                         params.ssids[0].ssid = wpa_s->current_ssid->ssid;
 788                         params.ssids[0].ssid_len =
 789                                 wpa_s->current_ssid->ssid_len;
 790                         params.num_ssids = 1;
 791                 } else {
 792                         wpa_printf(MSG_DEBUG, "P2P: No specific SSID known for scan during invitation");
 793                 }
 794                 goto ssid_list_set;
 795         }
 796 #endif /* CONFIG_P2P */
 797
 798         /* Find the starting point from which to continue scanning */
 799         ssid = wpa_s->conf->ssid;
 800         if (wpa_s->prev_scan_ssid != WILDCARD_SSID_SCAN) {
 801                 while (ssid) {
 802                         if (ssid == wpa_s->prev_scan_ssid) {
 803                                 ssid = ssid->next;
 804                                 break;
 805                         }
 806                         ssid = ssid->next;
 807                 }
 808         }
 809
 810         if (wpa_s->last_scan_req != MANUAL_SCAN_REQ &&
 811             wpa_s->conf->ap_scan == 2) {
 812                 wpa_s->connect_without_scan = NULL;
 813                 wpa_s->prev_scan_wildcard = 0;
 814                 wpa_supplicant_assoc_try(wpa_s, ssid);
 815                 return;
 816         } else if (wpa_s->conf->ap_scan == 2) {
 817                 /*
 818                  * User-initiated scan request in ap_scan == 2; scan with
 819                  * wildcard SSID.
 820                  */
 821                 ssid = NULL;
 822         } else if (wpa_s->reattach && wpa_s->current_ssid != NULL) {
 823                 /*
 824                  * Perform single-channel single-SSID scan for
 825                  * reassociate-to-same-BSS operation.
 826                  */
 827                 /* Setup SSID */
 828                 ssid = wpa_s->current_ssid;
 829                 wpa_hexdump_ascii(MSG_DEBUG, "Scan SSID",
 830                                   ssid->ssid, ssid->ssid_len);
 831                 params.ssids[0].ssid = ssid->ssid;
 832                 params.ssids[0].ssid_len = ssid->ssid_len;
 833                 params.num_ssids = 1;
 834
 835                 /*
 836                  * Allocate memory for frequency array, allocate one extra
 837                  * slot for the zero-terminator.
 838                  */
 839                 params.freqs = os_malloc(sizeof(int) * 2);
 840                 if (params.freqs == NULL) {
 841                         wpa_dbg(wpa_s, MSG_ERROR, "Memory allocation failed");
 842                         return;
 843                 }
 844                 params.freqs[0] = wpa_s->assoc_freq;
 845                 params.freqs[1] = 0;
 846
 847                 /*
 848                  * Reset the reattach flag so that we fall back to full scan if
 849                  * this scan fails.
 850                  */
 851                 wpa_s->reattach = 0;
 852         } else {
 853                 struct wpa_ssid *start = ssid, *tssid;
 854                 int freqs_set = 0;
 855                 if (ssid == NULL && max_ssids > 1)
 856                         ssid = wpa_s->conf->ssid;
 857                 while (ssid) {
 858                         if (!wpas_network_disabled(wpa_s, ssid) &&
 859                             ssid->scan_ssid) {
 860                                 wpa_hexdump_ascii(MSG_DEBUG, "Scan SSID",
 861                                                   ssid->ssid, ssid->ssid_len);
 862                                 params.ssids[params.num_ssids].ssid =
 863                                         ssid->ssid;
 864                                 params.ssids[params.num_ssids].ssid_len =
 865                                         ssid->ssid_len;
 866                                 params.num_ssids++;
 867                                 if (params.num_ssids + 1 >= max_ssids)
 868                                         break;
 869                         }
 870                         ssid = ssid->next;
 871                         if (ssid == start)
 872                                 break;
 873                         if (ssid == NULL && max_ssids > 1 &&
 874                             start != wpa_s->conf->ssid)
 875                                 ssid = wpa_s->conf->ssid;
 876                 }
 877
 878                 if (wpa_s->scan_id_count &&
 879                     wpa_s->last_scan_req == MANUAL_SCAN_REQ)
 880                         wpa_set_scan_ssids(wpa_s, &params, max_ssids);
 881
 882                 for (tssid = wpa_s->conf->ssid;
 883                      wpa_s->last_scan_req != MANUAL_SCAN_REQ && tssid;
 884                      tssid = tssid->next) {
 885                         if (wpas_network_disabled(wpa_s, tssid))
 886                                 continue;
 887                         if ((params.freqs || !freqs_set) && tssid->scan_freq) {
 888                                 int_array_concat(&params.freqs,
 889                                                  tssid->scan_freq);
 890                         } else {
 891                                 os_free(params.freqs);
 892                                 params.freqs = NULL;
 893                         }
 894                         freqs_set = 1;
 895                 }
 896                 int_array_sort_unique(params.freqs);
 897         }
 898
 899         if (ssid && max_ssids == 1) {
 900                 /*
 901                  * If the driver is limited to 1 SSID at a time interleave
 902                  * wildcard SSID scans with specific SSID scans to avoid
 903                  * waiting a long time for a wildcard scan.
 904                  */
 905                 if (!wpa_s->prev_scan_wildcard) {
 906                         params.ssids[0].ssid = NULL;
 907                         params.ssids[0].ssid_len = 0;
 908                         wpa_s->prev_scan_wildcard = 1;
 909                         wpa_dbg(wpa_s, MSG_DEBUG, "Starting AP scan for "
 910                                 "wildcard SSID (Interleave with specific)");
 911                 } else {
 912                         wpa_s->prev_scan_ssid = ssid;
 913                         wpa_s->prev_scan_wildcard = 0;
 914                         wpa_dbg(wpa_s, MSG_DEBUG,
 915                                 "Starting AP scan for specific SSID: %s",
 916                                 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
 917                 }
 918         } else if (ssid) {
 919                 /* max_ssids > 1 */
 920
 921                 wpa_s->prev_scan_ssid = ssid;
 922                 wpa_dbg(wpa_s, MSG_DEBUG, "Include wildcard SSID in "
 923                         "the scan request");
 924                 params.num_ssids++;
 925         } else if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
 926                    wpa_s->manual_scan_passive && params.num_ssids == 0) {
 927                 wpa_dbg(wpa_s, MSG_DEBUG, "Use passive scan based on manual request");
 928         } else if (wpa_s->conf->passive_scan) {
 929                 wpa_dbg(wpa_s, MSG_DEBUG,
 930                         "Use passive scan based on configuration");
 931         } else {
 932                 wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
 933                 params.num_ssids++;
 934                 wpa_dbg(wpa_s, MSG_DEBUG, "Starting AP scan for wildcard "
 935                         "SSID");
 936         }
 937
 938 ssid_list_set:
 939         wpa_supplicant_optimize_freqs(wpa_s, &params);
 940         extra_ie = wpa_supplicant_extra_ies(wpa_s);
 941
 942         if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
 943             wpa_s->manual_scan_only_new) {
 944                 wpa_printf(MSG_DEBUG,
 945                            "Request driver to clear scan cache due to manual only_new=1 scan");
 946                 params.only_new_results = 1;
 947         }
 948
 949         if (wpa_s->last_scan_req == MANUAL_SCAN_REQ && params.freqs == NULL &&
 950             wpa_s->manual_scan_freqs) {
 951                 wpa_dbg(wpa_s, MSG_DEBUG, "Limit manual scan to specified channels");
 952                 params.freqs = wpa_s->manual_scan_freqs;
 953                 wpa_s->manual_scan_freqs = NULL;
 954         }
 955
 956         if (params.freqs == NULL && wpa_s->next_scan_freqs) {
 957                 wpa_dbg(wpa_s, MSG_DEBUG, "Optimize scan based on previously "
 958                         "generated frequency list");
 959                 params.freqs = wpa_s->next_scan_freqs;
 960         } else
 961                 os_free(wpa_s->next_scan_freqs);
 962         wpa_s->next_scan_freqs = NULL;
 963         wpa_setband_scan_freqs(wpa_s, &params);
 964
 965         /* See if user specified frequencies. If so, scan only those. */
 966         if (wpa_s->conf->freq_list && !params.freqs) {
 967                 wpa_dbg(wpa_s, MSG_DEBUG,
 968                         "Optimize scan based on conf->freq_list");
 969                 int_array_concat(&params.freqs, wpa_s->conf->freq_list);
 970         }
 971
 972         /* Use current associated channel? */
 973         if (wpa_s->conf->scan_cur_freq && !params.freqs) {
 974                 unsigned int num = wpa_s->num_multichan_concurrent;
 975
 976                 params.freqs = os_calloc(num + 1, sizeof(int));
 977                 if (params.freqs) {
 978                         num = get_shared_radio_freqs(wpa_s, params.freqs, num);
 979                         if (num > 0) {
 980                                 wpa_dbg(wpa_s, MSG_DEBUG, "Scan only the "
 981                                         "current operating channels since "
 982                                         "scan_cur_freq is enabled");
 983                         } else {
 984                                 os_free(params.freqs);
 985                                 params.freqs = NULL;
 986                         }
 987                 }
 988         }
 989
 990         params.filter_ssids = wpa_supplicant_build_filter_ssids(
 991                 wpa_s->conf, &params.num_filter_ssids);
 992         if (extra_ie) {
 993                 params.extra_ies = wpabuf_head(extra_ie);
 994                 params.extra_ies_len = wpabuf_len(extra_ie);
 995         }
 996
 997 #ifdef CONFIG_P2P
 998         if (wpa_s->p2p_in_provisioning || wpa_s->p2p_in_invitation ||
 999             (wpa_s->show_group_started && wpa_s->go_params)) {
1000                 /*
1001                  * The interface may not yet be in P2P mode, so we have to
1002                  * explicitly request P2P probe to disable CCK rates.
1003                  */
1004                 params.p2p_probe = 1;
1005         }
1006 #endif /* CONFIG_P2P */
1007
1008         if (wpa_s->mac_addr_rand_enable & MAC_ADDR_RAND_SCAN) {
1009                 params.mac_addr_rand = 1;
1010                 if (wpa_s->mac_addr_scan) {
1011                         params.mac_addr = wpa_s->mac_addr_scan;
1012                         params.mac_addr_mask = wpa_s->mac_addr_scan + ETH_ALEN;
1013                 }
1014         }
1015
1016         scan_params = &params;
1017
1018 scan:
1019 #ifdef CONFIG_P2P
1020         /*
1021          * If the driver does not support multi-channel concurrency and a
1022          * virtual interface that shares the same radio with the wpa_s interface
1023          * is operating there may not be need to scan other channels apart from
1024          * the current operating channel on the other virtual interface. Filter
1025          * out other channels in case we are trying to find a connection for a
1026          * station interface when we are not configured to prefer station
1027          * connection and a concurrent operation is already in process.
1028          */
1029         if (wpa_s->scan_for_connection &&
1030             wpa_s->last_scan_req == NORMAL_SCAN_REQ &&
1031             !scan_params->freqs && !params.freqs &&
1032             wpas_is_p2p_prioritized(wpa_s) &&
1033             wpa_s->p2p_group_interface == NOT_P2P_GROUP_INTERFACE &&
1034             non_p2p_network_enabled(wpa_s)) {
1035                 unsigned int num = wpa_s->num_multichan_concurrent;
1036
1037                 params.freqs = os_calloc(num + 1, sizeof(int));
1038                 if (params.freqs) {
1039                         num = get_shared_radio_freqs(wpa_s, params.freqs, num);
1040                         if (num > 0 && num == wpa_s->num_multichan_concurrent) {
1041                                 wpa_dbg(wpa_s, MSG_DEBUG, "Scan only the current operating channels since all channels are already used");
1042                         } else {
1043                                 os_free(params.freqs);
1044                                 params.freqs = NULL;
1045                         }
1046                 }
1047         }
1048 #endif /* CONFIG_P2P */
1049
1050         ret = wpa_supplicant_trigger_scan(wpa_s, scan_params);
1051
1052         if (ret && wpa_s->last_scan_req == MANUAL_SCAN_REQ && params.freqs &&
1053             !wpa_s->manual_scan_freqs) {
1054                 /* Restore manual_scan_freqs for the next attempt */
1055                 wpa_s->manual_scan_freqs = params.freqs;
1056                 params.freqs = NULL;
1057         }
1058
1059         wpabuf_free(extra_ie);
1060         os_free(params.freqs);
1061         os_free(params.filter_ssids);
1062
1063         if (ret) {
1064                 wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate AP scan");
1065                 if (wpa_s->scan_prev_wpa_state != wpa_s->wpa_state)
1066                         wpa_supplicant_set_state(wpa_s,
1067                                                  wpa_s->scan_prev_wpa_state);
1068                 /* Restore scan_req since we will try to scan again */
1069                 wpa_s->scan_req = wpa_s->last_scan_req;
1070                 wpa_supplicant_req_scan(wpa_s, 1, 0);
1071         } else {
1072                 wpa_s->scan_for_connection = 0;
1073 #ifdef CONFIG_INTERWORKING
1074                 wpa_s->interworking_fast_assoc_tried = 0;
1075 #endif /* CONFIG_INTERWORKING */
1076         }
1077 }
1078
1079
1080 void wpa_supplicant_update_scan_int(struct wpa_supplicant *wpa_s, int sec)
1081 {
1082         struct os_reltime remaining, new_int;
1083         int cancelled;
1084
1085         cancelled = eloop_cancel_timeout_one(wpa_supplicant_scan, wpa_s, NULL,
1086                                              &remaining);
1087
1088         new_int.sec = sec;
1089         new_int.usec = 0;
1090         if (cancelled && os_reltime_before(&remaining, &new_int)) {
1091                 new_int.sec = remaining.sec;
1092                 new_int.usec = remaining.usec;
1093         }
1094
1095         if (cancelled) {
1096                 eloop_register_timeout(new_int.sec, new_int.usec,
1097                                        wpa_supplicant_scan, wpa_s, NULL);
1098         }
1099         wpa_s->scan_interval = sec;
1100 }
1101
1102
1103 /**
1104  * wpa_supplicant_req_scan - Schedule a scan for neighboring access points
1105  * @wpa_s: Pointer to wpa_supplicant data
1106  * @sec: Number of seconds after which to scan
1107  * @usec: Number of microseconds after which to scan
1108  *
1109  * This function is used to schedule a scan for neighboring access points after
1110  * the specified time.
1111  */
1112 void wpa_supplicant_req_scan(struct wpa_supplicant *wpa_s, int sec, int usec)
1113 {
1114         int res;
1115
1116         if (wpa_s->p2p_mgmt) {
1117                 wpa_dbg(wpa_s, MSG_DEBUG,
1118                         "Ignore scan request (%d.%06d sec) on p2p_mgmt interface",
1119                         sec, usec);
1120                 return;
1121         }
1122
1123         res = eloop_deplete_timeout(sec, usec, wpa_supplicant_scan, wpa_s,
1124                                     NULL);
1125         if (res == 1) {
1126                 wpa_dbg(wpa_s, MSG_DEBUG, "Rescheduling scan request: %d.%06d sec",
1127                         sec, usec);
1128         } else if (res == 0) {
1129                 wpa_dbg(wpa_s, MSG_DEBUG, "Ignore new scan request for %d.%06d sec since an earlier request is scheduled to trigger sooner",
1130                         sec, usec);
1131         } else {
1132                 wpa_dbg(wpa_s, MSG_DEBUG, "Setting scan request: %d.%06d sec",
1133                         sec, usec);
1134                 eloop_register_timeout(sec, usec, wpa_supplicant_scan, wpa_s, NULL);
1135         }
1136 }
1137
1138
1139 /**
1140  * wpa_supplicant_delayed_sched_scan - Request a delayed scheduled scan
1141  * @wpa_s: Pointer to wpa_supplicant data
1142  * @sec: Number of seconds after which to scan
1143  * @usec: Number of microseconds after which to scan
1144  * Returns: 0 on success or -1 otherwise
1145  *
1146  * This function is used to schedule periodic scans for neighboring
1147  * access points after the specified time.
1148  */
1149 int wpa_supplicant_delayed_sched_scan(struct wpa_supplicant *wpa_s,
1150                                       int sec, int usec)
1151 {
1152         if (!wpa_s->sched_scan_supported)
1153                 return -1;
1154
1155         eloop_register_timeout(sec, usec,
1156                                wpa_supplicant_delayed_sched_scan_timeout,
1157                                wpa_s, NULL);
1158
1159         return 0;
1160 }
1161
1162
1163 /**
1164  * wpa_supplicant_req_sched_scan - Start a periodic scheduled scan
1165  * @wpa_s: Pointer to wpa_supplicant data
1166  * Returns: 0 is sched_scan was started or -1 otherwise
1167  *
1168  * This function is used to schedule periodic scans for neighboring
1169  * access points repeating the scan continuously.
1170  */
1171 int wpa_supplicant_req_sched_scan(struct wpa_supplicant *wpa_s)
1172 {
1173         struct wpa_driver_scan_params params;
1174         struct wpa_driver_scan_params *scan_params;
1175         enum wpa_states prev_state;
1176         struct wpa_ssid *ssid = NULL;
1177         struct wpabuf *extra_ie = NULL;
1178         int ret;
1179         unsigned int max_sched_scan_ssids;
1180         int wildcard = 0;
1181         int need_ssids;
1182
1183         if (!wpa_s->sched_scan_supported)
1184                 return -1;
1185
1186         if (wpa_s->max_sched_scan_ssids > WPAS_MAX_SCAN_SSIDS)
1187                 max_sched_scan_ssids = WPAS_MAX_SCAN_SSIDS;
1188         else
1189                 max_sched_scan_ssids = wpa_s->max_sched_scan_ssids;
1190         if (max_sched_scan_ssids < 1 || wpa_s->conf->disable_scan_offload)
1191                 return -1;
1192
1193         if (wpa_s->sched_scanning) {
1194                 wpa_dbg(wpa_s, MSG_DEBUG, "Already sched scanning");
1195                 return 0;
1196         }
1197
1198         need_ssids = 0;
1199         for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
1200                 if (!wpas_network_disabled(wpa_s, ssid) && !ssid->scan_ssid) {
1201                         /* Use wildcard SSID to find this network */
1202                         wildcard = 1;
1203                 } else if (!wpas_network_disabled(wpa_s, ssid) &&
1204                            ssid->ssid_len)
1205                         need_ssids++;
1206
1207 #ifdef CONFIG_WPS
1208                 if (!wpas_network_disabled(wpa_s, ssid) &&
1209                     ssid->key_mgmt == WPA_KEY_MGMT_WPS) {
1210                         /*
1211                          * Normal scan is more reliable and faster for WPS
1212                          * operations and since these are for short periods of
1213                          * time, the benefit of trying to use sched_scan would
1214                          * be limited.
1215                          */
1216                         wpa_dbg(wpa_s, MSG_DEBUG, "Use normal scan instead of "
1217                                 "sched_scan for WPS");
1218                         return -1;
1219                 }
1220 #endif /* CONFIG_WPS */
1221         }
1222         if (wildcard)
1223                 need_ssids++;
1224
1225         if (wpa_s->normal_scans < 3 &&
1226             (need_ssids <= wpa_s->max_scan_ssids ||
1227              wpa_s->max_scan_ssids >= (int) max_sched_scan_ssids)) {
1228                 /*
1229                  * When normal scan can speed up operations, use that for the
1230                  * first operations before starting the sched_scan to allow
1231                  * user space sleep more. We do this only if the normal scan
1232                  * has functionality that is suitable for this or if the
1233                  * sched_scan does not have better support for multiple SSIDs.
1234                  */
1235                 wpa_dbg(wpa_s, MSG_DEBUG, "Use normal scan instead of "
1236                         "sched_scan for initial scans (normal_scans=%d)",
1237                         wpa_s->normal_scans);
1238                 return -1;
1239         }
1240
1241         os_memset(&params, 0, sizeof(params));
1242
1243         /* If we can't allocate space for the filters, we just don't filter */
1244         params.filter_ssids = os_calloc(wpa_s->max_match_sets,
1245                                         sizeof(struct wpa_driver_scan_filter));
1246
1247         prev_state = wpa_s->wpa_state;
1248         if (wpa_s->wpa_state == WPA_DISCONNECTED ||
1249             wpa_s->wpa_state == WPA_INACTIVE)
1250                 wpa_supplicant_set_state(wpa_s, WPA_SCANNING);
1251
1252         if (wpa_s->autoscan_params != NULL) {
1253                 scan_params = wpa_s->autoscan_params;
1254                 goto scan;
1255         }
1256
1257         /* Find the starting point from which to continue scanning */
1258         ssid = wpa_s->conf->ssid;
1259         if (wpa_s->prev_sched_ssid) {
1260                 while (ssid) {
1261                         if (ssid == wpa_s->prev_sched_ssid) {
1262                                 ssid = ssid->next;
1263                                 break;
1264                         }
1265                         ssid = ssid->next;
1266                 }
1267         }
1268
1269         if (!ssid || !wpa_s->prev_sched_ssid) {
1270                 wpa_dbg(wpa_s, MSG_DEBUG, "Beginning of SSID list");
1271                 if (wpa_s->conf->sched_scan_interval)
1272                         wpa_s->sched_scan_interval =
1273                                 wpa_s->conf->sched_scan_interval;
1274                 if (wpa_s->sched_scan_interval == 0)
1275                         wpa_s->sched_scan_interval = 10;
1276                 wpa_s->sched_scan_timeout = max_sched_scan_ssids * 2;
1277                 wpa_s->first_sched_scan = 1;
1278                 ssid = wpa_s->conf->ssid;
1279                 wpa_s->prev_sched_ssid = ssid;
1280         }
1281
1282         if (wildcard) {
1283                 wpa_dbg(wpa_s, MSG_DEBUG, "Add wildcard SSID to sched_scan");
1284                 params.num_ssids++;
1285         }
1286
1287         while (ssid) {
1288                 if (wpas_network_disabled(wpa_s, ssid))
1289                         goto next;
1290
1291                 if (params.num_filter_ssids < wpa_s->max_match_sets &&
1292                     params.filter_ssids && ssid->ssid && ssid->ssid_len) {
1293                         wpa_dbg(wpa_s, MSG_DEBUG, "add to filter ssid: %s",
1294                                 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
1295                         os_memcpy(params.filter_ssids[params.num_filter_ssids].ssid,
1296                                   ssid->ssid, ssid->ssid_len);
1297                         params.filter_ssids[params.num_filter_ssids].ssid_len =
1298                                 ssid->ssid_len;
1299                         params.num_filter_ssids++;
1300                 } else if (params.filter_ssids && ssid->ssid && ssid->ssid_len)
1301                 {
1302                         wpa_dbg(wpa_s, MSG_DEBUG, "Not enough room for SSID "
1303                                 "filter for sched_scan - drop filter");
1304                         os_free(params.filter_ssids);
1305                         params.filter_ssids = NULL;
1306                         params.num_filter_ssids = 0;
1307                 }
1308
1309                 if (ssid->scan_ssid && ssid->ssid && ssid->ssid_len) {
1310                         if (params.num_ssids == max_sched_scan_ssids)
1311                                 break; /* only room for broadcast SSID */
1312                         wpa_dbg(wpa_s, MSG_DEBUG,
1313                                 "add to active scan ssid: %s",
1314                                 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
1315                         params.ssids[params.num_ssids].ssid =
1316                                 ssid->ssid;
1317                         params.ssids[params.num_ssids].ssid_len =
1318                                 ssid->ssid_len;
1319                         params.num_ssids++;
1320                         if (params.num_ssids >= max_sched_scan_ssids) {
1321                                 wpa_s->prev_sched_ssid = ssid;
1322                                 do {
1323                                         ssid = ssid->next;
1324                                 } while (ssid &&
1325                                          (wpas_network_disabled(wpa_s, ssid) ||
1326                                           !ssid->scan_ssid));
1327                                 break;
1328                         }
1329                 }
1330
1331         next:
1332                 wpa_s->prev_sched_ssid = ssid;
1333                 ssid = ssid->next;
1334         }
1335
1336         if (params.num_filter_ssids == 0) {
1337                 os_free(params.filter_ssids);
1338                 params.filter_ssids = NULL;
1339         }
1340
1341         extra_ie = wpa_supplicant_extra_ies(wpa_s);
1342         if (extra_ie) {
1343                 params.extra_ies = wpabuf_head(extra_ie);
1344                 params.extra_ies_len = wpabuf_len(extra_ie);
1345         }
1346
1347         if (wpa_s->conf->filter_rssi)
1348                 params.filter_rssi = wpa_s->conf->filter_rssi;
1349
1350         /* See if user specified frequencies. If so, scan only those. */
1351         if (wpa_s->conf->freq_list && !params.freqs) {
1352                 wpa_dbg(wpa_s, MSG_DEBUG,
1353                         "Optimize scan based on conf->freq_list");
1354                 int_array_concat(&params.freqs, wpa_s->conf->freq_list);
1355         }
1356
1357         scan_params = &params;
1358
1359 scan:
1360         if (ssid || !wpa_s->first_sched_scan) {
1361                 wpa_dbg(wpa_s, MSG_DEBUG,
1362                         "Starting sched scan: interval %d timeout %d",
1363                         wpa_s->sched_scan_interval, wpa_s->sched_scan_timeout);
1364         } else {
1365                 wpa_dbg(wpa_s, MSG_DEBUG,
1366                         "Starting sched scan: interval %d (no timeout)",
1367                         wpa_s->sched_scan_interval);
1368         }
1369
1370         wpa_setband_scan_freqs(wpa_s, scan_params);
1371
1372         if (wpa_s->mac_addr_rand_enable & MAC_ADDR_RAND_SCHED_SCAN) {
1373                 params.mac_addr_rand = 1;
1374                 if (wpa_s->mac_addr_sched_scan) {
1375                         params.mac_addr = wpa_s->mac_addr_sched_scan;
1376                         params.mac_addr_mask = wpa_s->mac_addr_sched_scan +
1377                                 ETH_ALEN;
1378                 }
1379         }
1380
1381         ret = wpa_supplicant_start_sched_scan(wpa_s, scan_params,
1382                                               wpa_s->sched_scan_interval);
1383         wpabuf_free(extra_ie);
1384         os_free(params.filter_ssids);
1385         if (ret) {
1386                 wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate sched scan");
1387                 if (prev_state != wpa_s->wpa_state)
1388                         wpa_supplicant_set_state(wpa_s, prev_state);
1389                 return ret;
1390         }
1391
1392         /* If we have more SSIDs to scan, add a timeout so we scan them too */
1393         if (ssid || !wpa_s->first_sched_scan) {
1394                 wpa_s->sched_scan_timed_out = 0;
1395                 eloop_register_timeout(wpa_s->sched_scan_timeout, 0,
1396                                        wpa_supplicant_sched_scan_timeout,
1397                                        wpa_s, NULL);
1398                 wpa_s->first_sched_scan = 0;
1399                 wpa_s->sched_scan_timeout /= 2;
1400                 wpa_s->sched_scan_interval *= 2;
1401                 if (wpa_s->sched_scan_timeout < wpa_s->sched_scan_interval) {
1402                         wpa_s->sched_scan_interval = 10;
1403                         wpa_s->sched_scan_timeout = max_sched_scan_ssids * 2;
1404                 }
1405         }
1406
1407         /* If there is no more ssids, start next time from the beginning */
1408         if (!ssid)
1409                 wpa_s->prev_sched_ssid = NULL;
1410
1411         return 0;
1412 }
1413
1414
1415 /**
1416  * wpa_supplicant_cancel_scan - Cancel a scheduled scan request
1417  * @wpa_s: Pointer to wpa_supplicant data
1418  *
1419  * This function is used to cancel a scan request scheduled with
1420  * wpa_supplicant_req_scan().
1421  */
1422 void wpa_supplicant_cancel_scan(struct wpa_supplicant *wpa_s)
1423 {
1424         wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling scan request");
1425         eloop_cancel_timeout(wpa_supplicant_scan, wpa_s, NULL);
1426 }
1427
1428
1429 /**
1430  * wpa_supplicant_cancel_delayed_sched_scan - Stop a delayed scheduled scan
1431  * @wpa_s: Pointer to wpa_supplicant data
1432  *
1433  * This function is used to stop a delayed scheduled scan.
1434  */
1435 void wpa_supplicant_cancel_delayed_sched_scan(struct wpa_supplicant *wpa_s)
1436 {
1437         if (!wpa_s->sched_scan_supported)
1438                 return;
1439
1440         wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling delayed sched scan");
1441         eloop_cancel_timeout(wpa_supplicant_delayed_sched_scan_timeout,
1442                              wpa_s, NULL);
1443 }
1444
1445
1446 /**
1447  * wpa_supplicant_cancel_sched_scan - Stop running scheduled scans
1448  * @wpa_s: Pointer to wpa_supplicant data
1449  *
1450  * This function is used to stop a periodic scheduled scan.
1451  */
1452 void wpa_supplicant_cancel_sched_scan(struct wpa_supplicant *wpa_s)
1453 {
1454         if (!wpa_s->sched_scanning)
1455                 return;
1456
1457         wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling sched scan");
1458         eloop_cancel_timeout(wpa_supplicant_sched_scan_timeout, wpa_s, NULL);
1459         wpa_supplicant_stop_sched_scan(wpa_s);
1460 }
1461
1462
1463 /**
1464  * wpa_supplicant_notify_scanning - Indicate possible scan state change
1465  * @wpa_s: Pointer to wpa_supplicant data
1466  * @scanning: Whether scanning is currently in progress
1467  *
1468  * This function is to generate scanning notifycations. It is called whenever
1469  * there may have been a change in scanning (scan started, completed, stopped).
1470  * wpas_notify_scanning() is called whenever the scanning state changed from the
1471  * previously notified state.
1472  */
1473 void wpa_supplicant_notify_scanning(struct wpa_supplicant *wpa_s,
1474                                     int scanning)
1475 {
1476         if (wpa_s->scanning != scanning) {
1477                 wpa_s->scanning = scanning;
1478                 wpas_notify_scanning(wpa_s);
1479         }
1480 }
1481
1482
1483 static int wpa_scan_get_max_rate(const struct wpa_scan_res *res)
1484 {
1485         int rate = 0;
1486         const u8 *ie;
1487         int i;
1488
1489         ie = wpa_scan_get_ie(res, WLAN_EID_SUPP_RATES);
1490         for (i = 0; ie && i < ie[1]; i++) {
1491                 if ((ie[i + 2] & 0x7f) > rate)
1492                         rate = ie[i + 2] & 0x7f;
1493         }
1494
1495         ie = wpa_scan_get_ie(res, WLAN_EID_EXT_SUPP_RATES);
1496         for (i = 0; ie && i < ie[1]; i++) {
1497                 if ((ie[i + 2] & 0x7f) > rate)
1498                         rate = ie[i + 2] & 0x7f;
1499         }
1500
1501         return rate;
1502 }
1503
1504
1505 /**
1506  * wpa_scan_get_ie - Fetch a specified information element from a scan result
1507  * @res: Scan result entry
1508  * @ie: Information element identitifier (WLAN_EID_*)
1509  * Returns: Pointer to the information element (id field) or %NULL if not found
1510  *
1511  * This function returns the first matching information element in the scan
1512  * result.
1513  */
1514 const u8 * wpa_scan_get_ie(const struct wpa_scan_res *res, u8 ie)
1515 {
1516         const u8 *end, *pos;
1517
1518         pos = (const u8 *) (res + 1);
1519         end = pos + res->ie_len;
1520
1521         while (pos + 1 < end) {
1522                 if (pos + 2 + pos[1] > end)
1523                         break;
1524                 if (pos[0] == ie)
1525                         return pos;
1526                 pos += 2 + pos[1];
1527         }
1528
1529         return NULL;
1530 }
1531
1532
1533 /**
1534  * wpa_scan_get_vendor_ie - Fetch vendor information element from a scan result
1535  * @res: Scan result entry
1536  * @vendor_type: Vendor type (four octets starting the IE payload)
1537  * Returns: Pointer to the information element (id field) or %NULL if not found
1538  *
1539  * This function returns the first matching information element in the scan
1540  * result.
1541  */
1542 const u8 * wpa_scan_get_vendor_ie(const struct wpa_scan_res *res,
1543                                   u32 vendor_type)
1544 {
1545         const u8 *end, *pos;
1546
1547         pos = (const u8 *) (res + 1);
1548         end = pos + res->ie_len;
1549
1550         while (pos + 1 < end) {
1551                 if (pos + 2 + pos[1] > end)
1552                         break;
1553                 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1554                     vendor_type == WPA_GET_BE32(&pos[2]))
1555                         return pos;
1556                 pos += 2 + pos[1];
1557         }
1558
1559         return NULL;
1560 }
1561
1562
1563 /**
1564  * wpa_scan_get_vendor_ie_beacon - Fetch vendor information from a scan result
1565  * @res: Scan result entry
1566  * @vendor_type: Vendor type (four octets starting the IE payload)
1567  * Returns: Pointer to the information element (id field) or %NULL if not found
1568  *
1569  * This function returns the first matching information element in the scan
1570  * result.
1571  *
1572  * This function is like wpa_scan_get_vendor_ie(), but uses IE buffer only
1573  * from Beacon frames instead of either Beacon or Probe Response frames.
1574  */
1575 const u8 * wpa_scan_get_vendor_ie_beacon(const struct wpa_scan_res *res,
1576                                          u32 vendor_type)
1577 {
1578         const u8 *end, *pos;
1579
1580         if (res->beacon_ie_len == 0)
1581                 return NULL;
1582
1583         pos = (const u8 *) (res + 1);
1584         pos += res->ie_len;
1585         end = pos + res->beacon_ie_len;
1586
1587         while (pos + 1 < end) {
1588                 if (pos + 2 + pos[1] > end)
1589                         break;
1590                 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1591                     vendor_type == WPA_GET_BE32(&pos[2]))
1592                         return pos;
1593                 pos += 2 + pos[1];
1594         }
1595
1596         return NULL;
1597 }
1598
1599
1600 /**
1601  * wpa_scan_get_vendor_ie_multi - Fetch vendor IE data from a scan result
1602  * @res: Scan result entry
1603  * @vendor_type: Vendor type (four octets starting the IE payload)
1604  * Returns: Pointer to the information element payload or %NULL if not found
1605  *
1606  * This function returns concatenated payload of possibly fragmented vendor
1607  * specific information elements in the scan result. The caller is responsible
1608  * for freeing the returned buffer.
1609  */
1610 struct wpabuf * wpa_scan_get_vendor_ie_multi(const struct wpa_scan_res *res,
1611                                              u32 vendor_type)
1612 {
1613         struct wpabuf *buf;
1614         const u8 *end, *pos;
1615
1616         buf = wpabuf_alloc(res->ie_len);
1617         if (buf == NULL)
1618                 return NULL;
1619
1620         pos = (const u8 *) (res + 1);
1621         end = pos + res->ie_len;
1622
1623         while (pos + 1 < end) {
1624                 if (pos + 2 + pos[1] > end)
1625                         break;
1626                 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1627                     vendor_type == WPA_GET_BE32(&pos[2]))
1628                         wpabuf_put_data(buf, pos + 2 + 4, pos[1] - 4);
1629                 pos += 2 + pos[1];
1630         }
1631
1632         if (wpabuf_len(buf) == 0) {
1633                 wpabuf_free(buf);
1634                 buf = NULL;
1635         }
1636
1637         return buf;
1638 }
1639
1640
1641 /*
1642  * Channels with a great SNR can operate at full rate. What is a great SNR?
1643  * This doc https://supportforums.cisco.com/docs/DOC-12954 says, "the general
1644  * rule of thumb is that any SNR above 20 is good." This one
1645  * http://www.cisco.com/en/US/tech/tk722/tk809/technologies_q_and_a_item09186a00805e9a96.shtml#qa23
1646  * recommends 25 as a minimum SNR for 54 Mbps data rate. 30 is chosen here as a
1647  * conservative value.
1648  */
1649 #define GREAT_SNR 30
1650
1651 #define IS_5GHZ(n) (n > 4000)
1652
1653 /* Compare function for sorting scan results. Return >0 if @b is considered
1654  * better. */
1655 static int wpa_scan_result_compar(const void *a, const void *b)
1656 {
1657 #define MIN(a,b) a < b ? a : b
1658         struct wpa_scan_res **_wa = (void *) a;
1659         struct wpa_scan_res **_wb = (void *) b;
1660         struct wpa_scan_res *wa = *_wa;
1661         struct wpa_scan_res *wb = *_wb;
1662         int wpa_a, wpa_b;
1663         int snr_a, snr_b, snr_a_full, snr_b_full;
1664
1665         /* WPA/WPA2 support preferred */
1666         wpa_a = wpa_scan_get_vendor_ie(wa, WPA_IE_VENDOR_TYPE) != NULL ||
1667                 wpa_scan_get_ie(wa, WLAN_EID_RSN) != NULL;
1668         wpa_b = wpa_scan_get_vendor_ie(wb, WPA_IE_VENDOR_TYPE) != NULL ||
1669                 wpa_scan_get_ie(wb, WLAN_EID_RSN) != NULL;
1670
1671         if (wpa_b && !wpa_a)
1672                 return 1;
1673         if (!wpa_b && wpa_a)
1674                 return -1;
1675
1676         /* privacy support preferred */
1677         if ((wa->caps & IEEE80211_CAP_PRIVACY) == 0 &&
1678             (wb->caps & IEEE80211_CAP_PRIVACY))
1679                 return 1;
1680         if ((wa->caps & IEEE80211_CAP_PRIVACY) &&
1681             (wb->caps & IEEE80211_CAP_PRIVACY) == 0)
1682                 return -1;
1683
1684         if (wa->flags & wb->flags & WPA_SCAN_LEVEL_DBM) {
1685                 snr_a_full = wa->snr;
1686                 snr_a = MIN(wa->snr, GREAT_SNR);
1687                 snr_b_full = wb->snr;
1688                 snr_b = MIN(wb->snr, GREAT_SNR);
1689         } else {
1690                 /* Level is not in dBm, so we can't calculate
1691                  * SNR. Just use raw level (units unknown). */
1692                 snr_a = snr_a_full = wa->level;
1693                 snr_b = snr_b_full = wb->level;
1694         }
1695
1696         /* if SNR is close, decide by max rate or frequency band */
1697         if ((snr_a && snr_b && abs(snr_b - snr_a) < 5) ||
1698             (wa->qual && wb->qual && abs(wb->qual - wa->qual) < 10)) {
1699                 if (wa->est_throughput != wb->est_throughput)
1700                         return wb->est_throughput - wa->est_throughput;
1701                 if (IS_5GHZ(wa->freq) ^ IS_5GHZ(wb->freq))
1702                         return IS_5GHZ(wa->freq) ? -1 : 1;
1703         }
1704
1705         /* all things being equal, use SNR; if SNRs are
1706          * identical, use quality values since some drivers may only report
1707          * that value and leave the signal level zero */
1708         if (snr_b_full == snr_a_full)
1709                 return wb->qual - wa->qual;
1710         return snr_b_full - snr_a_full;
1711 #undef MIN
1712 }
1713
1714
1715 #ifdef CONFIG_WPS
1716 /* Compare function for sorting scan results when searching a WPS AP for
1717  * provisioning. Return >0 if @b is considered better. */
1718 static int wpa_scan_result_wps_compar(const void *a, const void *b)
1719 {
1720         struct wpa_scan_res **_wa = (void *) a;
1721         struct wpa_scan_res **_wb = (void *) b;
1722         struct wpa_scan_res *wa = *_wa;
1723         struct wpa_scan_res *wb = *_wb;
1724         int uses_wps_a, uses_wps_b;
1725         struct wpabuf *wps_a, *wps_b;
1726         int res;
1727
1728         /* Optimization - check WPS IE existence before allocated memory and
1729          * doing full reassembly. */
1730         uses_wps_a = wpa_scan_get_vendor_ie(wa, WPS_IE_VENDOR_TYPE) != NULL;
1731         uses_wps_b = wpa_scan_get_vendor_ie(wb, WPS_IE_VENDOR_TYPE) != NULL;
1732         if (uses_wps_a && !uses_wps_b)
1733                 return -1;
1734         if (!uses_wps_a && uses_wps_b)
1735                 return 1;
1736
1737         if (uses_wps_a && uses_wps_b) {
1738                 wps_a = wpa_scan_get_vendor_ie_multi(wa, WPS_IE_VENDOR_TYPE);
1739                 wps_b = wpa_scan_get_vendor_ie_multi(wb, WPS_IE_VENDOR_TYPE);
1740                 res = wps_ap_priority_compar(wps_a, wps_b);
1741                 wpabuf_free(wps_a);
1742                 wpabuf_free(wps_b);
1743                 if (res)
1744                         return res;
1745         }
1746
1747         /*
1748          * Do not use current AP security policy as a sorting criteria during
1749          * WPS provisioning step since the AP may get reconfigured at the
1750          * completion of provisioning.
1751          */
1752
1753         /* all things being equal, use signal level; if signal levels are
1754          * identical, use quality values since some drivers may only report
1755          * that value and leave the signal level zero */
1756         if (wb->level == wa->level)
1757                 return wb->qual - wa->qual;
1758         return wb->level - wa->level;
1759 }
1760 #endif /* CONFIG_WPS */
1761
1762
1763 static void dump_scan_res(struct wpa_scan_results *scan_res)
1764 {
1765 #ifndef CONFIG_NO_STDOUT_DEBUG
1766         size_t i;
1767
1768         if (scan_res->res == NULL || scan_res->num == 0)
1769                 return;
1770
1771         wpa_printf(MSG_EXCESSIVE, "Sorted scan results");
1772
1773         for (i = 0; i < scan_res->num; i++) {
1774                 struct wpa_scan_res *r = scan_res->res[i];
1775                 u8 *pos;
1776                 if (r->flags & WPA_SCAN_LEVEL_DBM) {
1777                         int noise_valid = !(r->flags & WPA_SCAN_NOISE_INVALID);
1778
1779                         wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d "
1780                                    "noise=%d%s level=%d snr=%d%s flags=0x%x age=%u est=%u",
1781                                    MAC2STR(r->bssid), r->freq, r->qual,
1782                                    r->noise, noise_valid ? "" : "~", r->level,
1783                                    r->snr, r->snr >= GREAT_SNR ? "*" : "",
1784                                    r->flags,
1785                                    r->age, r->est_throughput);
1786                 } else {
1787                         wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d "
1788                                    "noise=%d level=%d flags=0x%x age=%u est=%u",
1789                                    MAC2STR(r->bssid), r->freq, r->qual,
1790                                    r->noise, r->level, r->flags, r->age,
1791                                    r->est_throughput);
1792                 }
1793                 pos = (u8 *) (r + 1);
1794                 if (r->ie_len)
1795                         wpa_hexdump(MSG_EXCESSIVE, "IEs", pos, r->ie_len);
1796                 pos += r->ie_len;
1797                 if (r->beacon_ie_len)
1798                         wpa_hexdump(MSG_EXCESSIVE, "Beacon IEs",
1799                                     pos, r->beacon_ie_len);
1800         }
1801 #endif /* CONFIG_NO_STDOUT_DEBUG */
1802 }
1803
1804
1805 /**
1806  * wpa_supplicant_filter_bssid_match - Is the specified BSSID allowed
1807  * @wpa_s: Pointer to wpa_supplicant data
1808  * @bssid: BSSID to check
1809  * Returns: 0 if the BSSID is filtered or 1 if not
1810  *
1811  * This function is used to filter out specific BSSIDs from scan reslts mainly
1812  * for testing purposes (SET bssid_filter ctrl_iface command).
1813  */
1814 int wpa_supplicant_filter_bssid_match(struct wpa_supplicant *wpa_s,
1815                                       const u8 *bssid)
1816 {
1817         size_t i;
1818
1819         if (wpa_s->bssid_filter == NULL)
1820                 return 1;
1821
1822         for (i = 0; i < wpa_s->bssid_filter_count; i++) {
1823                 if (os_memcmp(wpa_s->bssid_filter + i * ETH_ALEN, bssid,
1824                               ETH_ALEN) == 0)
1825                         return 1;
1826         }
1827
1828         return 0;
1829 }
1830
1831
1832 static void filter_scan_res(struct wpa_supplicant *wpa_s,
1833                             struct wpa_scan_results *res)
1834 {
1835         size_t i, j;
1836
1837         if (wpa_s->bssid_filter == NULL)
1838                 return;
1839
1840         for (i = 0, j = 0; i < res->num; i++) {
1841                 if (wpa_supplicant_filter_bssid_match(wpa_s,
1842                                                       res->res[i]->bssid)) {
1843                         res->res[j++] = res->res[i];
1844                 } else {
1845                         os_free(res->res[i]);
1846                         res->res[i] = NULL;
1847                 }
1848         }
1849
1850         if (res->num != j) {
1851                 wpa_printf(MSG_DEBUG, "Filtered out %d scan results",
1852                            (int) (res->num - j));
1853                 res->num = j;
1854         }
1855 }
1856
1857
1858 /*
1859  * Noise floor values to use when we have signal strength
1860  * measurements, but no noise floor measurments. These values were
1861  * measured in an office environment with many APs.
1862  */
1863 #define DEFAULT_NOISE_FLOOR_2GHZ (-89)
1864 #define DEFAULT_NOISE_FLOOR_5GHZ (-92)
1865
1866 static void scan_snr(struct wpa_scan_res *res)
1867 {
1868         if (res->flags & WPA_SCAN_NOISE_INVALID) {
1869                 res->noise = IS_5GHZ(res->freq) ?
1870                         DEFAULT_NOISE_FLOOR_5GHZ :
1871                         DEFAULT_NOISE_FLOOR_2GHZ;
1872         }
1873
1874         if (res->flags & WPA_SCAN_LEVEL_DBM) {
1875                 res->snr = res->level - res->noise;
1876         } else {
1877                 /* Level is not in dBm, so we can't calculate
1878                  * SNR. Just use raw level (units unknown). */
1879                 res->snr = res->level;
1880         }
1881 }
1882
1883
1884 static unsigned int max_ht20_rate(int snr)
1885 {
1886         if (snr < 6)
1887                 return 6500; /* HT20 MCS0 */
1888         if (snr < 8)
1889                 return 13000; /* HT20 MCS1 */
1890         if (snr < 13)
1891                 return 19500; /* HT20 MCS2 */
1892         if (snr < 17)
1893                 return 26000; /* HT20 MCS3 */
1894         if (snr < 20)
1895                 return 39000; /* HT20 MCS4 */
1896         if (snr < 23)
1897                 return 52000; /* HT20 MCS5 */
1898         if (snr < 24)
1899                 return 58500; /* HT20 MCS6 */
1900         return 65000; /* HT20 MCS7 */
1901 }
1902
1903
1904 static unsigned int max_ht40_rate(int snr)
1905 {
1906         if (snr < 3)
1907                 return 13500; /* HT40 MCS0 */
1908         if (snr < 6)
1909                 return 27000; /* HT40 MCS1 */
1910         if (snr < 10)
1911                 return 40500; /* HT40 MCS2 */
1912         if (snr < 15)
1913                 return 54000; /* HT40 MCS3 */
1914         if (snr < 17)
1915                 return 81000; /* HT40 MCS4 */
1916         if (snr < 22)
1917                 return 108000; /* HT40 MCS5 */
1918         if (snr < 24)
1919                 return 121500; /* HT40 MCS6 */
1920         return 135000; /* HT40 MCS7 */
1921 }
1922
1923
1924 static unsigned int max_vht80_rate(int snr)
1925 {
1926         if (snr < 1)
1927                 return 0;
1928         if (snr < 2)
1929                 return 29300; /* VHT80 MCS0 */
1930         if (snr < 5)
1931                 return 58500; /* VHT80 MCS1 */
1932         if (snr < 9)
1933                 return 87800; /* VHT80 MCS2 */
1934         if (snr < 11)
1935                 return 117000; /* VHT80 MCS3 */
1936         if (snr < 15)
1937                 return 175500; /* VHT80 MCS4 */
1938         if (snr < 16)
1939                 return 234000; /* VHT80 MCS5 */
1940         if (snr < 18)
1941                 return 263300; /* VHT80 MCS6 */
1942         if (snr < 20)
1943                 return 292500; /* VHT80 MCS7 */
1944         if (snr < 22)
1945                 return 351000; /* VHT80 MCS8 */
1946         return 390000; /* VHT80 MCS9 */
1947 }
1948
1949
1950 static void scan_est_throughput(struct wpa_supplicant *wpa_s,
1951                                 struct wpa_scan_res *res)
1952 {
1953         enum local_hw_capab capab = wpa_s->hw_capab;
1954         int rate; /* max legacy rate in 500 kb/s units */
1955         const u8 *ie;
1956         unsigned int est, tmp;
1957         int snr = res->snr;
1958
1959         if (res->est_throughput)
1960                 return;
1961
1962         /* Get maximum legacy rate */
1963         rate = wpa_scan_get_max_rate(res);
1964
1965         /* Limit based on estimated SNR */
1966         if (rate > 1 * 2 && snr < 1)
1967                 rate = 1 * 2;
1968         else if (rate > 2 * 2 && snr < 4)
1969                 rate = 2 * 2;
1970         else if (rate > 6 * 2 && snr < 5)
1971                 rate = 6 * 2;
1972         else if (rate > 9 * 2 && snr < 6)
1973                 rate = 9 * 2;
1974         else if (rate > 12 * 2 && snr < 7)
1975                 rate = 12 * 2;
1976         else if (rate > 18 * 2 && snr < 10)
1977                 rate = 18 * 2;
1978         else if (rate > 24 * 2 && snr < 11)
1979                 rate = 24 * 2;
1980         else if (rate > 36 * 2 && snr < 15)
1981                 rate = 36 * 2;
1982         else if (rate > 48 * 2 && snr < 19)
1983                 rate = 48 * 2;
1984         else if (rate > 54 * 2 && snr < 21)
1985                 rate = 54 * 2;
1986         est = rate * 500;
1987
1988         if (capab == CAPAB_HT || capab == CAPAB_HT40 || capab == CAPAB_VHT) {
1989                 ie = wpa_scan_get_ie(res, WLAN_EID_HT_CAP);
1990                 if (ie) {
1991                         tmp = max_ht20_rate(snr);
1992                         if (tmp > est)
1993                                 est = tmp;
1994                 }
1995         }
1996
1997         if (capab == CAPAB_HT40 || capab == CAPAB_VHT) {
1998                 ie = wpa_scan_get_ie(res, WLAN_EID_HT_OPERATION);
1999                 if (ie && ie[1] >= 2 &&
2000                     (ie[3] & HT_INFO_HT_PARAM_SECONDARY_CHNL_OFF_MASK)) {
2001                         tmp = max_ht40_rate(snr);
2002                         if (tmp > est)
2003                                 est = tmp;
2004                 }
2005         }
2006
2007         if (capab == CAPAB_VHT) {
2008                 /* Use +1 to assume VHT is always faster than HT */
2009                 ie = wpa_scan_get_ie(res, WLAN_EID_VHT_CAP);
2010                 if (ie) {
2011                         tmp = max_ht20_rate(snr) + 1;
2012                         if (tmp > est)
2013                                 est = tmp;
2014
2015                         ie = wpa_scan_get_ie(res, WLAN_EID_HT_OPERATION);
2016                         if (ie && ie[1] >= 2 &&
2017                             (ie[3] &
2018                              HT_INFO_HT_PARAM_SECONDARY_CHNL_OFF_MASK)) {
2019                                 tmp = max_ht40_rate(snr) + 1;
2020                                 if (tmp > est)
2021                                         est = tmp;
2022                         }
2023
2024                         ie = wpa_scan_get_ie(res, WLAN_EID_VHT_OPERATION);
2025                         if (ie && ie[1] >= 1 &&
2026                             (ie[2] & VHT_OPMODE_CHANNEL_WIDTH_MASK)) {
2027                                 tmp = max_vht80_rate(snr) + 1;
2028                                 if (tmp > est)
2029                                         est = tmp;
2030                         }
2031                 }
2032         }
2033
2034         /* TODO: channel utilization and AP load (e.g., from AP Beacon) */
2035
2036         res->est_throughput = est;
2037 }
2038
2039
2040 /**
2041  * wpa_supplicant_get_scan_results - Get scan results
2042  * @wpa_s: Pointer to wpa_supplicant data
2043  * @info: Information about what was scanned or %NULL if not available
2044  * @new_scan: Whether a new scan was performed
2045  * Returns: Scan results, %NULL on failure
2046  *
2047  * This function request the current scan results from the driver and updates
2048  * the local BSS list wpa_s->bss. The caller is responsible for freeing the
2049  * results with wpa_scan_results_free().
2050  */
2051 struct wpa_scan_results *
2052 wpa_supplicant_get_scan_results(struct wpa_supplicant *wpa_s,
2053                                 struct scan_info *info, int new_scan)
2054 {
2055         struct wpa_scan_results *scan_res;
2056         size_t i;
2057         int (*compar)(const void *, const void *) = wpa_scan_result_compar;
2058
2059         scan_res = wpa_drv_get_scan_results2(wpa_s);
2060         if (scan_res == NULL) {
2061                 wpa_dbg(wpa_s, MSG_DEBUG, "Failed to get scan results");
2062                 return NULL;
2063         }
2064         if (scan_res->fetch_time.sec == 0) {
2065                 /*
2066                  * Make sure we have a valid timestamp if the driver wrapper
2067                  * does not set this.
2068                  */
2069                 os_get_reltime(&scan_res->fetch_time);
2070         }
2071         filter_scan_res(wpa_s, scan_res);
2072
2073         for (i = 0; i < scan_res->num; i++) {
2074                 struct wpa_scan_res *scan_res_item = scan_res->res[i];
2075
2076                 scan_snr(scan_res_item);
2077                 scan_est_throughput(wpa_s, scan_res_item);
2078         }
2079
2080 #ifdef CONFIG_WPS
2081         if (wpas_wps_searching(wpa_s)) {
2082                 wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Order scan results with WPS "
2083                         "provisioning rules");
2084                 compar = wpa_scan_result_wps_compar;
2085         }
2086 #endif /* CONFIG_WPS */
2087
2088         qsort(scan_res->res, scan_res->num, sizeof(struct wpa_scan_res *),
2089               compar);
2090         dump_scan_res(scan_res);
2091
2092         wpa_bss_update_start(wpa_s);
2093         for (i = 0; i < scan_res->num; i++)
2094                 wpa_bss_update_scan_res(wpa_s, scan_res->res[i],
2095                                         &scan_res->fetch_time);
2096         wpa_bss_update_end(wpa_s, info, new_scan);
2097
2098         return scan_res;
2099 }
2100
2101
2102 /**
2103  * wpa_supplicant_update_scan_results - Update scan results from the driver
2104  * @wpa_s: Pointer to wpa_supplicant data
2105  * Returns: 0 on success, -1 on failure
2106  *
2107  * This function updates the BSS table within wpa_supplicant based on the
2108  * currently available scan results from the driver without requesting a new
2109  * scan. This is used in cases where the driver indicates an association
2110  * (including roaming within ESS) and wpa_supplicant does not yet have the
2111  * needed information to complete the connection (e.g., to perform validation
2112  * steps in 4-way handshake).
2113  */
2114 int wpa_supplicant_update_scan_results(struct wpa_supplicant *wpa_s)
2115 {
2116         struct wpa_scan_results *scan_res;
2117         scan_res = wpa_supplicant_get_scan_results(wpa_s, NULL, 0);
2118         if (scan_res == NULL)
2119                 return -1;
2120         wpa_scan_results_free(scan_res);
2121
2122         return 0;
2123 }
2124
2125
2126 /**
2127  * scan_only_handler - Reports scan results
2128  */
2129 void scan_only_handler(struct wpa_supplicant *wpa_s,
2130                        struct wpa_scan_results *scan_res)
2131 {
2132         wpa_dbg(wpa_s, MSG_DEBUG, "Scan-only results received");
2133         if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
2134             wpa_s->manual_scan_use_id && wpa_s->own_scan_running) {
2135                 wpa_msg_ctrl(wpa_s, MSG_INFO, WPA_EVENT_SCAN_RESULTS "id=%u",
2136                              wpa_s->manual_scan_id);
2137                 wpa_s->manual_scan_use_id = 0;
2138         } else {
2139                 wpa_msg_ctrl(wpa_s, MSG_INFO, WPA_EVENT_SCAN_RESULTS);
2140         }
2141         wpas_notify_scan_results(wpa_s);
2142         wpas_notify_scan_done(wpa_s, 1);
2143         if (wpa_s->scan_work) {
2144                 struct wpa_radio_work *work = wpa_s->scan_work;
2145                 wpa_s->scan_work = NULL;
2146                 radio_work_done(work);
2147         }
2148 }
2149
2150
2151 int wpas_scan_scheduled(struct wpa_supplicant *wpa_s)
2152 {
2153         return eloop_is_timeout_registered(wpa_supplicant_scan, wpa_s, NULL);
2154 }
2155
2156
2157 struct wpa_driver_scan_params *
2158 wpa_scan_clone_params(const struct wpa_driver_scan_params *src)
2159 {
2160         struct wpa_driver_scan_params *params;
2161         size_t i;
2162         u8 *n;
2163
2164         params = os_zalloc(sizeof(*params));
2165         if (params == NULL)
2166                 return NULL;
2167
2168         for (i = 0; i < src->num_ssids; i++) {
2169                 if (src->ssids[i].ssid) {
2170                         n = os_malloc(src->ssids[i].ssid_len);
2171                         if (n == NULL)
2172                                 goto failed;
2173                         os_memcpy(n, src->ssids[i].ssid,
2174                                   src->ssids[i].ssid_len);
2175                         params->ssids[i].ssid = n;
2176                         params->ssids[i].ssid_len = src->ssids[i].ssid_len;
2177                 }
2178         }
2179         params->num_ssids = src->num_ssids;
2180
2181         if (src->extra_ies) {
2182                 n = os_malloc(src->extra_ies_len);
2183                 if (n == NULL)
2184                         goto failed;
2185                 os_memcpy(n, src->extra_ies, src->extra_ies_len);
2186                 params->extra_ies = n;
2187                 params->extra_ies_len = src->extra_ies_len;
2188         }
2189
2190         if (src->freqs) {
2191                 int len = int_array_len(src->freqs);
2192                 params->freqs = os_malloc((len + 1) * sizeof(int));
2193                 if (params->freqs == NULL)
2194                         goto failed;
2195                 os_memcpy(params->freqs, src->freqs, (len + 1) * sizeof(int));
2196         }
2197
2198         if (src->filter_ssids) {
2199                 params->filter_ssids = os_malloc(sizeof(*params->filter_ssids) *
2200                                                  src->num_filter_ssids);
2201                 if (params->filter_ssids == NULL)
2202                         goto failed;
2203                 os_memcpy(params->filter_ssids, src->filter_ssids,
2204                           sizeof(*params->filter_ssids) *
2205                           src->num_filter_ssids);
2206                 params->num_filter_ssids = src->num_filter_ssids;
2207         }
2208
2209         params->filter_rssi = src->filter_rssi;
2210         params->p2p_probe = src->p2p_probe;
2211         params->only_new_results = src->only_new_results;
2212         params->low_priority = src->low_priority;
2213
2214         if (src->mac_addr_rand) {
2215                 params->mac_addr_rand = src->mac_addr_rand;
2216
2217                 if (src->mac_addr && src->mac_addr_mask) {
2218                         u8 *mac_addr;
2219
2220                         mac_addr = os_malloc(2 * ETH_ALEN);
2221                         if (!mac_addr)
2222                                 goto failed;
2223
2224                         os_memcpy(mac_addr, src->mac_addr, ETH_ALEN);
2225                         os_memcpy(mac_addr + ETH_ALEN, src->mac_addr_mask,
2226                                   ETH_ALEN);
2227                         params->mac_addr = mac_addr;
2228                         params->mac_addr_mask = mac_addr + ETH_ALEN;
2229                 }
2230         }
2231         return params;
2232
2233 failed:
2234         wpa_scan_free_params(params);
2235         return NULL;
2236 }
2237
2238
2239 void wpa_scan_free_params(struct wpa_driver_scan_params *params)
2240 {
2241         size_t i;
2242
2243         if (params == NULL)
2244                 return;
2245
2246         for (i = 0; i < params->num_ssids; i++)
2247                 os_free((u8 *) params->ssids[i].ssid);
2248         os_free((u8 *) params->extra_ies);
2249         os_free(params->freqs);
2250         os_free(params->filter_ssids);
2251
2252         /*
2253          * Note: params->mac_addr_mask points to same memory allocation and
2254          * must not be freed separately.
2255          */
2256         os_free((u8 *) params->mac_addr);
2257
2258         os_free(params);
2259 }
2260
2261
2262 int wpas_start_pno(struct wpa_supplicant *wpa_s)
2263 {
2264         int ret, interval, prio;
2265         size_t i, num_ssid, num_match_ssid;
2266         struct wpa_ssid *ssid;
2267         struct wpa_driver_scan_params params;
2268
2269         if (!wpa_s->sched_scan_supported)
2270                 return -1;
2271
2272         if (wpa_s->pno || wpa_s->pno_sched_pending)
2273                 return 0;
2274
2275         if ((wpa_s->wpa_state > WPA_SCANNING) &&
2276             (wpa_s->wpa_state <= WPA_COMPLETED)) {
2277                 wpa_printf(MSG_ERROR, "PNO: In assoc process");
2278                 return -EAGAIN;
2279         }
2280
2281         if (wpa_s->wpa_state == WPA_SCANNING) {
2282                 wpa_supplicant_cancel_scan(wpa_s);
2283                 if (wpa_s->sched_scanning) {
2284                         wpa_printf(MSG_DEBUG, "Schedule PNO on completion of "
2285                                    "ongoing sched scan");
2286                         wpa_supplicant_cancel_sched_scan(wpa_s);
2287                         wpa_s->pno_sched_pending = 1;
2288                         return 0;
2289                 }
2290         }
2291
2292         os_memset(&params, 0, sizeof(params));
2293
2294         num_ssid = num_match_ssid = 0;
2295         ssid = wpa_s->conf->ssid;
2296         while (ssid) {
2297                 if (!wpas_network_disabled(wpa_s, ssid)) {
2298                         num_match_ssid++;
2299                         if (ssid->scan_ssid)
2300                                 num_ssid++;
2301                 }
2302                 ssid = ssid->next;
2303         }
2304
2305         if (num_match_ssid == 0) {
2306                 wpa_printf(MSG_DEBUG, "PNO: No configured SSIDs");
2307                 return -1;
2308         }
2309
2310         if (num_match_ssid > num_ssid) {
2311                 params.num_ssids++; /* wildcard */
2312                 num_ssid++;
2313         }
2314
2315         if (num_ssid > WPAS_MAX_SCAN_SSIDS) {
2316                 wpa_printf(MSG_DEBUG, "PNO: Use only the first %u SSIDs from "
2317                            "%u", WPAS_MAX_SCAN_SSIDS, (unsigned int) num_ssid);
2318                 num_ssid = WPAS_MAX_SCAN_SSIDS;
2319         }
2320
2321         if (num_match_ssid > wpa_s->max_match_sets) {
2322                 num_match_ssid = wpa_s->max_match_sets;
2323                 wpa_dbg(wpa_s, MSG_DEBUG, "PNO: Too many SSIDs to match");
2324         }
2325         params.filter_ssids = os_calloc(num_match_ssid,
2326                                         sizeof(struct wpa_driver_scan_filter));
2327         if (params.filter_ssids == NULL)
2328                 return -1;
2329
2330         i = 0;
2331         prio = 0;
2332         ssid = wpa_s->conf->pssid[prio];
2333         while (ssid) {
2334                 if (!wpas_network_disabled(wpa_s, ssid)) {
2335                         if (ssid->scan_ssid && params.num_ssids < num_ssid) {
2336                                 params.ssids[params.num_ssids].ssid =
2337                                         ssid->ssid;
2338                                 params.ssids[params.num_ssids].ssid_len =
2339                                          ssid->ssid_len;
2340                                 params.num_ssids++;
2341                         }
2342                         os_memcpy(params.filter_ssids[i].ssid, ssid->ssid,
2343                                   ssid->ssid_len);
2344                         params.filter_ssids[i].ssid_len = ssid->ssid_len;
2345                         params.num_filter_ssids++;
2346                         i++;
2347                         if (i == num_match_ssid)
2348                                 break;
2349                 }
2350                 if (ssid->pnext)
2351                         ssid = ssid->pnext;
2352                 else if (prio + 1 == wpa_s->conf->num_prio)
2353                         break;
2354                 else
2355                         ssid = wpa_s->conf->pssid[++prio];
2356         }
2357
2358         if (wpa_s->conf->filter_rssi)
2359                 params.filter_rssi = wpa_s->conf->filter_rssi;
2360
2361         interval = wpa_s->conf->sched_scan_interval ?
2362                 wpa_s->conf->sched_scan_interval : 10;
2363
2364         if (params.freqs == NULL && wpa_s->manual_sched_scan_freqs) {
2365                 wpa_dbg(wpa_s, MSG_DEBUG, "Limit sched scan to specified channels");
2366                 params.freqs = wpa_s->manual_sched_scan_freqs;
2367         }
2368
2369         if (wpa_s->mac_addr_rand_enable & MAC_ADDR_RAND_PNO) {
2370                 params.mac_addr_rand = 1;
2371                 if (wpa_s->mac_addr_pno) {
2372                         params.mac_addr = wpa_s->mac_addr_pno;
2373                         params.mac_addr_mask = wpa_s->mac_addr_pno + ETH_ALEN;
2374                 }
2375         }
2376
2377         ret = wpa_supplicant_start_sched_scan(wpa_s, &params, interval);
2378         os_free(params.filter_ssids);
2379         if (ret == 0)
2380                 wpa_s->pno = 1;
2381         else
2382                 wpa_msg(wpa_s, MSG_ERROR, "Failed to schedule PNO");
2383         return ret;
2384 }
2385
2386
2387 int wpas_stop_pno(struct wpa_supplicant *wpa_s)
2388 {
2389         int ret = 0;
2390
2391         if (!wpa_s->pno)
2392                 return 0;
2393
2394         ret = wpa_supplicant_stop_sched_scan(wpa_s);
2395
2396         wpa_s->pno = 0;
2397         wpa_s->pno_sched_pending = 0;
2398
2399         if (wpa_s->wpa_state == WPA_SCANNING)
2400                 wpa_supplicant_req_scan(wpa_s, 0, 0);
2401
2402         return ret;
2403 }
2404
2405
2406 void wpas_mac_addr_rand_scan_clear(struct wpa_supplicant *wpa_s,
2407                                     unsigned int type)
2408 {
2409         type &= MAC_ADDR_RAND_ALL;
2410         wpa_s->mac_addr_rand_enable &= ~type;
2411
2412         if (type & MAC_ADDR_RAND_SCAN) {
2413                 os_free(wpa_s->mac_addr_scan);
2414                 wpa_s->mac_addr_scan = NULL;
2415         }
2416
2417         if (type & MAC_ADDR_RAND_SCHED_SCAN) {
2418                 os_free(wpa_s->mac_addr_sched_scan);
2419                 wpa_s->mac_addr_sched_scan = NULL;
2420         }
2421
2422         if (type & MAC_ADDR_RAND_PNO) {
2423                 os_free(wpa_s->mac_addr_pno);
2424                 wpa_s->mac_addr_pno = NULL;
2425         }
2426 }
2427
2428
2429 int wpas_mac_addr_rand_scan_set(struct wpa_supplicant *wpa_s,
2430                                 unsigned int type, const u8 *addr,
2431                                 const u8 *mask)
2432 {
2433         u8 *tmp = NULL;
2434
2435         wpas_mac_addr_rand_scan_clear(wpa_s, type);
2436
2437         if (addr) {
2438                 tmp = os_malloc(2 * ETH_ALEN);
2439                 if (!tmp)
2440                         return -1;
2441                 os_memcpy(tmp, addr, ETH_ALEN);
2442                 os_memcpy(tmp + ETH_ALEN, mask, ETH_ALEN);
2443         }
2444
2445         if (type == MAC_ADDR_RAND_SCAN) {
2446                 wpa_s->mac_addr_scan = tmp;
2447         } else if (type == MAC_ADDR_RAND_SCHED_SCAN) {
2448                 wpa_s->mac_addr_sched_scan = tmp;
2449         } else if (type == MAC_ADDR_RAND_PNO) {
2450                 wpa_s->mac_addr_pno = tmp;
2451         } else {
2452                 wpa_printf(MSG_INFO,
2453                            "scan: Invalid MAC randomization type=0x%x",
2454                            type);
2455                 os_free(tmp);
2456                 return -1;
2457         }
2458
2459         wpa_s->mac_addr_rand_enable |= type;
2460         return 0;
2461 }