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