libeap/wpa_supplicant/scan.c

   1 /*
   2  * WPA Supplicant - Scanning
   3  * Copyright (c) 2003-2014, Jouni Malinen <j@w1.fi>
   4  *
   5  * This software may be distributed under the terms of the BSD license.
   6  * See README for more details.
   7  */
   8
   9 #include "utils/includes.h"
  10
  11 #include "utils/common.h"
  12 #include "utils/eloop.h"
  13 #include "common/ieee802_11_defs.h"
  14 #include "common/wpa_ctrl.h"
  15 #include "config.h"
  16 #include "wpa_supplicant_i.h"
  17 #include "driver_i.h"
  18 #include "wps_supplicant.h"
  19 #include "p2p_supplicant.h"
  20 #include "p2p/p2p.h"
  21 #include "hs20_supplicant.h"
  22 #include "notify.h"
  23 #include "bss.h"
  24 #include "scan.h"
  25 #include "mesh.h"
  26
  27
  28 static void wpa_supplicant_gen_assoc_event(struct wpa_supplicant *wpa_s)
  29 {
  30         struct wpa_ssid *ssid;
  31         union wpa_event_data data;
  32
  33         ssid = wpa_supplicant_get_ssid(wpa_s);
  34         if (ssid == NULL)
  35                 return;
  36
  37         if (wpa_s->current_ssid == NULL) {
  38                 wpa_s->current_ssid = ssid;
  39                 if (wpa_s->current_ssid != NULL)
  40                         wpas_notify_network_changed(wpa_s);
  41         }
  42         wpa_supplicant_initiate_eapol(wpa_s);
  43         wpa_dbg(wpa_s, MSG_DEBUG, "Already associated with a configured "
  44                 "network - generating associated event");
  45         os_memset(&data, 0, sizeof(data));
  46         wpa_supplicant_event(wpa_s, EVENT_ASSOC, &data);
  47 }
  48
  49
  50 #ifdef CONFIG_WPS
  51 static int wpas_wps_in_use(struct wpa_supplicant *wpa_s,
  52                            enum wps_request_type *req_type)
  53 {
  54         struct wpa_ssid *ssid;
  55         int wps = 0;
  56
  57         for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
  58                 if (!(ssid->key_mgmt & WPA_KEY_MGMT_WPS))
  59                         continue;
  60
  61                 wps = 1;
  62                 *req_type = wpas_wps_get_req_type(ssid);
  63                 if (!ssid->eap.phase1)
  64                         continue;
  65
  66                 if (os_strstr(ssid->eap.phase1, "pbc=1"))
  67                         return 2;
  68         }
  69
  70 #ifdef CONFIG_P2P
  71         if (!wpa_s->global->p2p_disabled && wpa_s->global->p2p &&
  72             !wpa_s->conf->p2p_disabled) {
  73                 wpa_s->wps->dev.p2p = 1;
  74                 if (!wps) {
  75                         wps = 1;
  76                         *req_type = WPS_REQ_ENROLLEE_INFO;
  77                 }
  78         }
  79 #endif /* CONFIG_P2P */
  80
  81         return wps;
  82 }
  83 #endif /* CONFIG_WPS */
  84
  85
  86 /**
  87  * wpa_supplicant_enabled_networks - Check whether there are enabled networks
  88  * @wpa_s: Pointer to wpa_supplicant data
  89  * Returns: 0 if no networks are enabled, >0 if networks are enabled
  90  *
  91  * This function is used to figure out whether any networks (or Interworking
  92  * with enabled credentials and auto_interworking) are present in the current
  93  * configuration.
  94  */
  95 int wpa_supplicant_enabled_networks(struct wpa_supplicant *wpa_s)
  96 {
  97         struct wpa_ssid *ssid = wpa_s->conf->ssid;
  98         int count = 0, disabled = 0;
  99
 100         if (wpa_s->p2p_mgmt)
 101                 return 0; /* no normal network profiles on p2p_mgmt interface */
 102
 103         while (ssid) {
 104                 if (!wpas_network_disabled(wpa_s, ssid))
 105                         count++;
 106                 else
 107                         disabled++;
 108                 ssid = ssid->next;
 109         }
 110         if (wpa_s->conf->cred && wpa_s->conf->interworking &&
 111             wpa_s->conf->auto_interworking)
 112                 count++;
 113         if (count == 0 && disabled > 0) {
 114                 wpa_dbg(wpa_s, MSG_DEBUG, "No enabled networks (%d disabled "
 115                         "networks)", disabled);
 116         }
 117         return count;
 118 }
 119
 120
 121 static void wpa_supplicant_assoc_try(struct wpa_supplicant *wpa_s,
 122                                      struct wpa_ssid *ssid)
 123 {
 124         while (ssid) {
 125                 if (!wpas_network_disabled(wpa_s, ssid))
 126                         break;
 127                 ssid = ssid->next;
 128         }
 129
 130         /* ap_scan=2 mode - try to associate with each SSID. */
 131         if (ssid == NULL) {
 132                 wpa_dbg(wpa_s, MSG_DEBUG, "wpa_supplicant_assoc_try: Reached "
 133                         "end of scan list - go back to beginning");
 134                 wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
 135                 wpa_supplicant_req_scan(wpa_s, 0, 0);
 136                 return;
 137         }
 138         if (ssid->next) {
 139                 /* Continue from the next SSID on the next attempt. */
 140                 wpa_s->prev_scan_ssid = ssid;
 141         } else {
 142                 /* Start from the beginning of the SSID list. */
 143                 wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
 144         }
 145         wpa_supplicant_associate(wpa_s, NULL, ssid);
 146 }
 147
 148
 149 static void wpas_trigger_scan_cb(struct wpa_radio_work *work, int deinit)
 150 {
 151         struct wpa_supplicant *wpa_s = work->wpa_s;
 152         struct wpa_driver_scan_params *params = work->ctx;
 153         int ret;
 154
 155         if (deinit) {
 156                 if (!work->started) {
 157                         wpa_scan_free_params(params);
 158                         return;
 159                 }
 160                 wpa_supplicant_notify_scanning(wpa_s, 0);
 161                 wpas_notify_scan_done(wpa_s, 0);
 162                 wpa_s->scan_work = NULL;
 163                 return;
 164         }
 165
 166         if (wpas_update_random_addr_disassoc(wpa_s) < 0) {
 167                 wpa_msg(wpa_s, MSG_INFO,
 168                         "Failed to assign random MAC address for a scan");
 169                 radio_work_done(work);
 170                 return;
 171         }
 172
 173         wpa_supplicant_notify_scanning(wpa_s, 1);
 174
 175         if (wpa_s->clear_driver_scan_cache) {
 176                 wpa_printf(MSG_DEBUG,
 177                            "Request driver to clear scan cache due to local BSS flush");
 178                 params->only_new_results = 1;
 179         }
 180         ret = wpa_drv_scan(wpa_s, params);
 181         wpa_scan_free_params(params);
 182         work->ctx = NULL;
 183         if (ret) {
 184                 int retry = wpa_s->last_scan_req != MANUAL_SCAN_REQ;
 185
 186                 if (wpa_s->disconnected)
 187                         retry = 0;
 188
 189                 wpa_supplicant_notify_scanning(wpa_s, 0);
 190                 wpas_notify_scan_done(wpa_s, 0);
 191                 if (wpa_s->wpa_state == WPA_SCANNING)
 192                         wpa_supplicant_set_state(wpa_s,
 193                                                  wpa_s->scan_prev_wpa_state);
 194                 wpa_msg(wpa_s, MSG_INFO, WPA_EVENT_SCAN_FAILED "ret=%d%s",
 195                         ret, retry ? " retry=1" : "");
 196                 radio_work_done(work);
 197
 198                 if (retry) {
 199                         /* Restore scan_req since we will try to scan again */
 200                         wpa_s->scan_req = wpa_s->last_scan_req;
 201                         wpa_supplicant_req_scan(wpa_s, 1, 0);
 202                 }
 203                 return;
 204         }
 205
 206         os_get_reltime(&wpa_s->scan_trigger_time);
 207         wpa_s->scan_runs++;
 208         wpa_s->normal_scans++;
 209         wpa_s->own_scan_requested = 1;
 210         wpa_s->clear_driver_scan_cache = 0;
 211         wpa_s->scan_work = work;
 212 }
 213
 214
 215 /**
 216  * wpa_supplicant_trigger_scan - Request driver to start a scan
 217  * @wpa_s: Pointer to wpa_supplicant data
 218  * @params: Scan parameters
 219  * Returns: 0 on success, -1 on failure
 220  */
 221 int wpa_supplicant_trigger_scan(struct wpa_supplicant *wpa_s,
 222                                 struct wpa_driver_scan_params *params)
 223 {
 224         struct wpa_driver_scan_params *ctx;
 225
 226         if (wpa_s->scan_work) {
 227                 wpa_dbg(wpa_s, MSG_INFO, "Reject scan trigger since one is already pending");
 228                 return -1;
 229         }
 230
 231         ctx = wpa_scan_clone_params(params);
 232         if (ctx == NULL)
 233                 return -1;
 234
 235         if (radio_add_work(wpa_s, 0, "scan", 0, wpas_trigger_scan_cb, ctx) < 0)
 236         {
 237                 wpa_scan_free_params(ctx);
 238                 return -1;
 239         }
 240
 241         return 0;
 242 }
 243
 244
 245 static void
 246 wpa_supplicant_delayed_sched_scan_timeout(void *eloop_ctx, void *timeout_ctx)
 247 {
 248         struct wpa_supplicant *wpa_s = eloop_ctx;
 249
 250         wpa_dbg(wpa_s, MSG_DEBUG, "Starting delayed sched scan");
 251
 252         if (wpa_supplicant_req_sched_scan(wpa_s))
 253                 wpa_supplicant_req_scan(wpa_s, 0, 0);
 254 }
 255
 256
 257 static void
 258 wpa_supplicant_sched_scan_timeout(void *eloop_ctx, void *timeout_ctx)
 259 {
 260         struct wpa_supplicant *wpa_s = eloop_ctx;
 261
 262         wpa_dbg(wpa_s, MSG_DEBUG, "Sched scan timeout - stopping it");
 263
 264         wpa_s->sched_scan_timed_out = 1;
 265         wpa_supplicant_cancel_sched_scan(wpa_s);
 266 }
 267
 268
 269 int wpa_supplicant_start_sched_scan(struct wpa_supplicant *wpa_s,
 270                                     struct wpa_driver_scan_params *params,
 271                                     int interval)
 272 {
 273         int ret;
 274
 275         wpa_supplicant_notify_scanning(wpa_s, 1);
 276         ret = wpa_drv_sched_scan(wpa_s, params, interval * 1000);
 277         if (ret)
 278                 wpa_supplicant_notify_scanning(wpa_s, 0);
 279         else
 280                 wpa_s->sched_scanning = 1;
 281
 282         return ret;
 283 }
 284
 285
 286 int wpa_supplicant_stop_sched_scan(struct wpa_supplicant *wpa_s)
 287 {
 288         int ret;
 289
 290         ret = wpa_drv_stop_sched_scan(wpa_s);
 291         if (ret) {
 292                 wpa_dbg(wpa_s, MSG_DEBUG, "stopping sched_scan failed!");
 293                 /* TODO: what to do if stopping fails? */
 294                 return -1;
 295         }
 296
 297         return ret;
 298 }
 299
 300
 301 static struct wpa_driver_scan_filter *
 302 wpa_supplicant_build_filter_ssids(struct wpa_config *conf, size_t *num_ssids)
 303 {
 304         struct wpa_driver_scan_filter *ssids;
 305         struct wpa_ssid *ssid;
 306         size_t count;
 307
 308         *num_ssids = 0;
 309         if (!conf->filter_ssids)
 310                 return NULL;
 311
 312         for (count = 0, ssid = conf->ssid; ssid; ssid = ssid->next) {
 313                 if (ssid->ssid && ssid->ssid_len)
 314                         count++;
 315         }
 316         if (count == 0)
 317                 return NULL;
 318         ssids = os_calloc(count, sizeof(struct wpa_driver_scan_filter));
 319         if (ssids == NULL)
 320                 return NULL;
 321
 322         for (ssid = conf->ssid; ssid; ssid = ssid->next) {
 323                 if (!ssid->ssid || !ssid->ssid_len)
 324                         continue;
 325                 os_memcpy(ssids[*num_ssids].ssid, ssid->ssid, ssid->ssid_len);
 326                 ssids[*num_ssids].ssid_len = ssid->ssid_len;
 327                 (*num_ssids)++;
 328         }
 329
 330         return ssids;
 331 }
 332
 333
 334 static void wpa_supplicant_optimize_freqs(
 335         struct wpa_supplicant *wpa_s, struct wpa_driver_scan_params *params)
 336 {
 337 #ifdef CONFIG_P2P
 338         if (params->freqs == NULL && wpa_s->p2p_in_provisioning &&
 339             wpa_s->go_params) {
 340                 /* Optimize provisioning state scan based on GO information */
 341                 if (wpa_s->p2p_in_provisioning < 5 &&
 342                     wpa_s->go_params->freq > 0) {
 343                         wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only GO "
 344                                 "preferred frequency %d MHz",
 345                                 wpa_s->go_params->freq);
 346                         params->freqs = os_calloc(2, sizeof(int));
 347                         if (params->freqs)
 348                                 params->freqs[0] = wpa_s->go_params->freq;
 349                 } else if (wpa_s->p2p_in_provisioning < 8 &&
 350                            wpa_s->go_params->freq_list[0]) {
 351                         wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only common "
 352                                 "channels");
 353                         int_array_concat(&params->freqs,
 354                                          wpa_s->go_params->freq_list);
 355                         if (params->freqs)
 356                                 int_array_sort_unique(params->freqs);
 357                 }
 358                 wpa_s->p2p_in_provisioning++;
 359         }
 360
 361         if (params->freqs == NULL && wpa_s->p2p_in_invitation) {
 362                 /*
 363                  * Optimize scan based on GO information during persistent
 364                  * group reinvocation
 365                  */
 366                 if (wpa_s->p2p_in_invitation < 5 &&
 367                     wpa_s->p2p_invite_go_freq > 0) {
 368                         wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only GO preferred frequency %d MHz during invitation",
 369                                 wpa_s->p2p_invite_go_freq);
 370                         params->freqs = os_calloc(2, sizeof(int));
 371                         if (params->freqs)
 372                                 params->freqs[0] = wpa_s->p2p_invite_go_freq;
 373                 }
 374                 wpa_s->p2p_in_invitation++;
 375                 if (wpa_s->p2p_in_invitation > 20) {
 376                         /*
 377                          * This should not really happen since the variable is
 378                          * cleared on group removal, but if it does happen, make
 379                          * sure we do not get stuck in special invitation scan
 380                          * mode.
 381                          */
 382                         wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Clear p2p_in_invitation");
 383                         wpa_s->p2p_in_invitation = 0;
 384                 }
 385         }
 386 #endif /* CONFIG_P2P */
 387
 388 #ifdef CONFIG_WPS
 389         if (params->freqs == NULL && wpa_s->after_wps && wpa_s->wps_freq) {
 390                 /*
 391                  * Optimize post-provisioning scan based on channel used
 392                  * during provisioning.
 393                  */
 394                 wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Scan only frequency %u MHz "
 395                         "that was used during provisioning", wpa_s->wps_freq);
 396                 params->freqs = os_calloc(2, sizeof(int));
 397                 if (params->freqs)
 398                         params->freqs[0] = wpa_s->wps_freq;
 399                 wpa_s->after_wps--;
 400         } else if (wpa_s->after_wps)
 401                 wpa_s->after_wps--;
 402
 403         if (params->freqs == NULL && wpa_s->known_wps_freq && wpa_s->wps_freq)
 404         {
 405                 /* Optimize provisioning scan based on already known channel */
 406                 wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Scan only frequency %u MHz",
 407                         wpa_s->wps_freq);
 408                 params->freqs = os_calloc(2, sizeof(int));
 409                 if (params->freqs)
 410                         params->freqs[0] = wpa_s->wps_freq;
 411                 wpa_s->known_wps_freq = 0; /* only do this once */
 412         }
 413 #endif /* CONFIG_WPS */
 414 }
 415
 416
 417 #ifdef CONFIG_INTERWORKING
 418 static void wpas_add_interworking_elements(struct wpa_supplicant *wpa_s,
 419                                            struct wpabuf *buf)
 420 {
 421         wpabuf_put_u8(buf, WLAN_EID_INTERWORKING);
 422         wpabuf_put_u8(buf, is_zero_ether_addr(wpa_s->conf->hessid) ? 1 :
 423                       1 + ETH_ALEN);
 424         wpabuf_put_u8(buf, wpa_s->conf->access_network_type);
 425         /* No Venue Info */
 426         if (!is_zero_ether_addr(wpa_s->conf->hessid))
 427                 wpabuf_put_data(buf, wpa_s->conf->hessid, ETH_ALEN);
 428 }
 429 #endif /* CONFIG_INTERWORKING */
 430
 431
 432 static struct wpabuf * wpa_supplicant_extra_ies(struct wpa_supplicant *wpa_s)
 433 {
 434         struct wpabuf *extra_ie = NULL;
 435         u8 ext_capab[18];
 436         int ext_capab_len;
 437 #ifdef CONFIG_WPS
 438         int wps = 0;
 439         enum wps_request_type req_type = WPS_REQ_ENROLLEE_INFO;
 440 #endif /* CONFIG_WPS */
 441
 442         ext_capab_len = wpas_build_ext_capab(wpa_s, ext_capab,
 443                                              sizeof(ext_capab));
 444         if (ext_capab_len > 0 &&
 445             wpabuf_resize(&extra_ie, ext_capab_len) == 0)
 446                 wpabuf_put_data(extra_ie, ext_capab, ext_capab_len);
 447
 448 #ifdef CONFIG_INTERWORKING
 449         if (wpa_s->conf->interworking &&
 450             wpabuf_resize(&extra_ie, 100) == 0)
 451                 wpas_add_interworking_elements(wpa_s, extra_ie);
 452 #endif /* CONFIG_INTERWORKING */
 453
 454 #ifdef CONFIG_WPS
 455         wps = wpas_wps_in_use(wpa_s, &req_type);
 456
 457         if (wps) {
 458                 struct wpabuf *wps_ie;
 459                 wps_ie = wps_build_probe_req_ie(wps == 2 ? DEV_PW_PUSHBUTTON :
 460                                                 DEV_PW_DEFAULT,
 461                                                 &wpa_s->wps->dev,
 462                                                 wpa_s->wps->uuid, req_type,
 463                                                 0, NULL);
 464                 if (wps_ie) {
 465                         if (wpabuf_resize(&extra_ie, wpabuf_len(wps_ie)) == 0)
 466                                 wpabuf_put_buf(extra_ie, wps_ie);
 467                         wpabuf_free(wps_ie);
 468                 }
 469         }
 470
 471 #ifdef CONFIG_P2P
 472         if (wps) {
 473                 size_t ielen = p2p_scan_ie_buf_len(wpa_s->global->p2p);
 474                 if (wpabuf_resize(&extra_ie, ielen) == 0)
 475                         wpas_p2p_scan_ie(wpa_s, extra_ie);
 476         }
 477 #endif /* CONFIG_P2P */
 478
 479         wpa_supplicant_mesh_add_scan_ie(wpa_s, &extra_ie);
 480
 481 #endif /* CONFIG_WPS */
 482
 483 #ifdef CONFIG_HS20
 484         if (wpa_s->conf->hs20 && wpabuf_resize(&extra_ie, 7) == 0)
 485                 wpas_hs20_add_indication(extra_ie, -1);
 486 #endif /* CONFIG_HS20 */
 487
 488 #ifdef CONFIG_FST
 489         if (wpa_s->fst_ies &&
 490             wpabuf_resize(&extra_ie, wpabuf_len(wpa_s->fst_ies)) == 0)
 491                 wpabuf_put_buf(extra_ie, wpa_s->fst_ies);
 492 #endif /* CONFIG_FST */
 493
 494         return extra_ie;
 495 }
 496
 497
 498 #ifdef CONFIG_P2P
 499
 500 /*
 501  * Check whether there are any enabled networks or credentials that could be
 502  * used for a non-P2P connection.
 503  */
 504 static int non_p2p_network_enabled(struct wpa_supplicant *wpa_s)
 505 {
 506         struct wpa_ssid *ssid;
 507
 508         for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
 509                 if (wpas_network_disabled(wpa_s, ssid))
 510                         continue;
 511                 if (!ssid->p2p_group)
 512                         return 1;
 513         }
 514
 515         if (wpa_s->conf->cred && wpa_s->conf->interworking &&
 516             wpa_s->conf->auto_interworking)
 517                 return 1;
 518
 519         return 0;
 520 }
 521
 522 #endif /* CONFIG_P2P */
 523
 524
 525 static struct hostapd_hw_modes * get_mode(struct hostapd_hw_modes *modes,
 526                                           u16 num_modes,
 527                                           enum hostapd_hw_mode mode)
 528 {
 529         u16 i;
 530
 531         for (i = 0; i < num_modes; i++) {
 532                 if (modes[i].mode == mode)
 533                         return &modes[i];
 534         }
 535
 536         return NULL;
 537 }
 538
 539
 540 static void wpa_setband_scan_freqs_list(struct wpa_supplicant *wpa_s,
 541                                         enum hostapd_hw_mode band,
 542                                         struct wpa_driver_scan_params *params)
 543 {
 544         /* Include only supported channels for the specified band */
 545         struct hostapd_hw_modes *mode;
 546         int count, i;
 547
 548         mode = get_mode(wpa_s->hw.modes, wpa_s->hw.num_modes, band);
 549         if (mode == NULL) {
 550                 /* No channels supported in this band - use empty list */
 551                 params->freqs = os_zalloc(sizeof(int));
 552                 return;
 553         }
 554
 555         params->freqs = os_calloc(mode->num_channels + 1, sizeof(int));
 556         if (params->freqs == NULL)
 557                 return;
 558         for (count = 0, i = 0; i < mode->num_channels; i++) {
 559                 if (mode->channels[i].flag & HOSTAPD_CHAN_DISABLED)
 560                         continue;
 561                 params->freqs[count++] = mode->channels[i].freq;
 562         }
 563 }
 564
 565
 566 static void wpa_setband_scan_freqs(struct wpa_supplicant *wpa_s,
 567                                    struct wpa_driver_scan_params *params)
 568 {
 569         if (wpa_s->hw.modes == NULL)
 570                 return; /* unknown what channels the driver supports */
 571         if (params->freqs)
 572                 return; /* already using a limited channel set */
 573         if (wpa_s->setband == WPA_SETBAND_5G)
 574                 wpa_setband_scan_freqs_list(wpa_s, HOSTAPD_MODE_IEEE80211A,
 575                                             params);
 576         else if (wpa_s->setband == WPA_SETBAND_2G)
 577                 wpa_setband_scan_freqs_list(wpa_s, HOSTAPD_MODE_IEEE80211G,
 578                                             params);
 579 }
 580
 581
 582 static void wpa_set_scan_ssids(struct wpa_supplicant *wpa_s,
 583                                struct wpa_driver_scan_params *params,
 584                                size_t max_ssids)
 585 {
 586         unsigned int i;
 587         struct wpa_ssid *ssid;
 588
 589         for (i = 0; i < wpa_s->scan_id_count; i++) {
 590                 unsigned int j;
 591
 592                 ssid = wpa_config_get_network(wpa_s->conf, wpa_s->scan_id[i]);
 593                 if (!ssid || !ssid->scan_ssid)
 594                         continue;
 595
 596                 for (j = 0; j < params->num_ssids; j++) {
 597                         if (params->ssids[j].ssid_len == ssid->ssid_len &&
 598                             params->ssids[j].ssid &&
 599                             os_memcmp(params->ssids[j].ssid, ssid->ssid,
 600                                       ssid->ssid_len) == 0)
 601                                 break;
 602                 }
 603                 if (j < params->num_ssids)
 604                         continue; /* already in the list */
 605
 606                 if (params->num_ssids + 1 > max_ssids) {
 607                         wpa_printf(MSG_DEBUG,
 608                                    "Over max scan SSIDs for manual request");
 609                         break;
 610                 }
 611
 612                 wpa_printf(MSG_DEBUG, "Scan SSID (manual request): %s",
 613                            wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
 614                 params->ssids[params->num_ssids].ssid = ssid->ssid;
 615                 params->ssids[params->num_ssids].ssid_len = ssid->ssid_len;
 616                 params->num_ssids++;
 617         }
 618
 619         wpa_s->scan_id_count = 0;
 620 }
 621
 622
 623 static int wpa_set_ssids_from_scan_req(struct wpa_supplicant *wpa_s,
 624                                        struct wpa_driver_scan_params *params,
 625                                        size_t max_ssids)
 626 {
 627         unsigned int i;
 628
 629         if (wpa_s->ssids_from_scan_req == NULL ||
 630             wpa_s->num_ssids_from_scan_req == 0)
 631                 return 0;
 632
 633         if (wpa_s->num_ssids_from_scan_req > max_ssids) {
 634                 wpa_s->num_ssids_from_scan_req = max_ssids;
 635                 wpa_printf(MSG_DEBUG, "Over max scan SSIDs from scan req: %u",
 636                            (unsigned int) max_ssids);
 637         }
 638
 639         for (i = 0; i < wpa_s->num_ssids_from_scan_req; i++) {
 640                 params->ssids[i].ssid = wpa_s->ssids_from_scan_req[i].ssid;
 641                 params->ssids[i].ssid_len =
 642                         wpa_s->ssids_from_scan_req[i].ssid_len;
 643                 wpa_hexdump_ascii(MSG_DEBUG, "specific SSID",
 644                                   params->ssids[i].ssid,
 645                                   params->ssids[i].ssid_len);
 646         }
 647
 648         params->num_ssids = wpa_s->num_ssids_from_scan_req;
 649         wpa_s->num_ssids_from_scan_req = 0;
 650         return 1;
 651 }
 652
 653
 654 static void wpa_supplicant_scan(void *eloop_ctx, void *timeout_ctx)
 655 {
 656         struct wpa_supplicant *wpa_s = eloop_ctx;
 657         struct wpa_ssid *ssid;
 658         int ret, p2p_in_prog;
 659         struct wpabuf *extra_ie = NULL;
 660         struct wpa_driver_scan_params params;
 661         struct wpa_driver_scan_params *scan_params;
 662         size_t max_ssids;
 663         int connect_without_scan = 0;
 664
 665         if (wpa_s->pno || wpa_s->pno_sched_pending) {
 666                 wpa_dbg(wpa_s, MSG_DEBUG, "Skip scan - PNO is in progress");
 667                 return;
 668         }
 669
 670         if (wpa_s->wpa_state == WPA_INTERFACE_DISABLED) {
 671                 wpa_dbg(wpa_s, MSG_DEBUG, "Skip scan - interface disabled");
 672                 return;
 673         }
 674
 675         if (wpa_s->disconnected && wpa_s->scan_req == NORMAL_SCAN_REQ) {
 676                 wpa_dbg(wpa_s, MSG_DEBUG, "Disconnected - do not scan");
 677                 wpa_supplicant_set_state(wpa_s, WPA_DISCONNECTED);
 678                 return;
 679         }
 680
 681         if (wpa_s->scanning) {
 682                 /*
 683                  * If we are already in scanning state, we shall reschedule the
 684                  * the incoming scan request.
 685                  */
 686                 wpa_dbg(wpa_s, MSG_DEBUG, "Already scanning - Reschedule the incoming scan req");
 687                 wpa_supplicant_req_scan(wpa_s, 1, 0);
 688                 return;
 689         }
 690
 691         if (!wpa_supplicant_enabled_networks(wpa_s) &&
 692             wpa_s->scan_req == NORMAL_SCAN_REQ) {
 693                 wpa_dbg(wpa_s, MSG_DEBUG, "No enabled networks - do not scan");
 694                 wpa_supplicant_set_state(wpa_s, WPA_INACTIVE);
 695                 return;
 696         }
 697
 698         if (wpa_s->conf->ap_scan != 0 &&
 699             (wpa_s->drv_flags & WPA_DRIVER_FLAGS_WIRED)) {
 700                 wpa_dbg(wpa_s, MSG_DEBUG, "Using wired authentication - "
 701                         "overriding ap_scan configuration");
 702                 wpa_s->conf->ap_scan = 0;
 703                 wpas_notify_ap_scan_changed(wpa_s);
 704         }
 705
 706         if (wpa_s->conf->ap_scan == 0) {
 707                 wpa_supplicant_gen_assoc_event(wpa_s);
 708                 return;
 709         }
 710
 711         ssid = NULL;
 712         if (wpa_s->scan_req != MANUAL_SCAN_REQ &&
 713             wpa_s->connect_without_scan) {
 714                 connect_without_scan = 1;
 715                 for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
 716                         if (ssid == wpa_s->connect_without_scan)
 717                                 break;
 718                 }
 719         }
 720
 721         p2p_in_prog = wpas_p2p_in_progress(wpa_s);
 722         if (p2p_in_prog && p2p_in_prog != 2 &&
 723             (!ssid ||
 724              (ssid->mode != WPAS_MODE_AP && ssid->mode != WPAS_MODE_P2P_GO))) {
 725                 wpa_dbg(wpa_s, MSG_DEBUG, "Delay station mode scan while P2P operation is in progress");
 726                 wpa_supplicant_req_scan(wpa_s, 5, 0);
 727                 return;
 728         }
 729
 730         if (wpa_s->conf->ap_scan == 2)
 731                 max_ssids = 1;
 732         else {
 733                 max_ssids = wpa_s->max_scan_ssids;
 734                 if (max_ssids > WPAS_MAX_SCAN_SSIDS)
 735                         max_ssids = WPAS_MAX_SCAN_SSIDS;
 736         }
 737
 738         wpa_s->last_scan_req = wpa_s->scan_req;
 739         wpa_s->scan_req = NORMAL_SCAN_REQ;
 740
 741         if (connect_without_scan) {
 742                 wpa_s->connect_without_scan = NULL;
 743                 if (ssid) {
 744                         wpa_printf(MSG_DEBUG, "Start a pre-selected network "
 745                                    "without scan step");
 746                         wpa_supplicant_associate(wpa_s, NULL, ssid);
 747                         return;
 748                 }
 749         }
 750
 751         os_memset(&params, 0, sizeof(params));
 752
 753         wpa_s->scan_prev_wpa_state = wpa_s->wpa_state;
 754         if (wpa_s->wpa_state == WPA_DISCONNECTED ||
 755             wpa_s->wpa_state == WPA_INACTIVE)
 756                 wpa_supplicant_set_state(wpa_s, WPA_SCANNING);
 757
 758         /*
 759          * If autoscan has set its own scanning parameters
 760          */
 761         if (wpa_s->autoscan_params != NULL) {
 762                 scan_params = wpa_s->autoscan_params;
 763                 goto scan;
 764         }
 765
 766         if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
 767             wpa_set_ssids_from_scan_req(wpa_s, &params, max_ssids)) {
 768                 wpa_printf(MSG_DEBUG, "Use specific SSIDs from SCAN command");
 769                 goto ssid_list_set;
 770         }
 771
 772 #ifdef CONFIG_P2P
 773         if ((wpa_s->p2p_in_provisioning || wpa_s->show_group_started) &&
 774             wpa_s->go_params && !wpa_s->conf->passive_scan) {
 775                 wpa_printf(MSG_DEBUG, "P2P: Use specific SSID for scan during P2P group formation (p2p_in_provisioning=%d show_group_started=%d)",
 776                            wpa_s->p2p_in_provisioning,
 777                            wpa_s->show_group_started);
 778                 params.ssids[0].ssid = wpa_s->go_params->ssid;
 779                 params.ssids[0].ssid_len = wpa_s->go_params->ssid_len;
 780                 params.num_ssids = 1;
 781                 goto ssid_list_set;
 782         }
 783
 784         if (wpa_s->p2p_in_invitation) {
 785                 if (wpa_s->current_ssid) {
 786                         wpa_printf(MSG_DEBUG, "P2P: Use specific SSID for scan during invitation");
 787                         params.ssids[0].ssid = wpa_s->current_ssid->ssid;
 788                         params.ssids[0].ssid_len =
 789                                 wpa_s->current_ssid->ssid_len;
 790                         params.num_ssids = 1;
 791                 } else {
 792                         wpa_printf(MSG_DEBUG, "P2P: No specific SSID known for scan during invitation");
 793                 }
 794                 goto ssid_list_set;
 795         }
 796 #endif /* CONFIG_P2P */
 797
 798         /* Find the starting point from which to continue scanning */
 799         ssid = wpa_s->conf->ssid;
 800         if (wpa_s->prev_scan_ssid != WILDCARD_SSID_SCAN) {
 801                 while (ssid) {
 802                         if (ssid == wpa_s->prev_scan_ssid) {
 803                                 ssid = ssid->next;
 804                                 break;
 805                         }
 806                         ssid = ssid->next;
 807                 }
 808         }
 809
 810         if (wpa_s->last_scan_req != MANUAL_SCAN_REQ &&
 811 #ifdef CONFIG_AP
 812             !wpa_s->ap_iface &&
 813 #endif /* CONFIG_AP */
 814             wpa_s->conf->ap_scan == 2) {
 815                 wpa_s->connect_without_scan = NULL;
 816                 wpa_s->prev_scan_wildcard = 0;
 817                 wpa_supplicant_assoc_try(wpa_s, ssid);
 818                 return;
 819         } else if (wpa_s->conf->ap_scan == 2) {
 820                 /*
 821                  * User-initiated scan request in ap_scan == 2; scan with
 822                  * wildcard SSID.
 823                  */
 824                 ssid = NULL;
 825         } else if (wpa_s->reattach && wpa_s->current_ssid != NULL) {
 826                 /*
 827                  * Perform single-channel single-SSID scan for
 828                  * reassociate-to-same-BSS operation.
 829                  */
 830                 /* Setup SSID */
 831                 ssid = wpa_s->current_ssid;
 832                 wpa_hexdump_ascii(MSG_DEBUG, "Scan SSID",
 833                                   ssid->ssid, ssid->ssid_len);
 834                 params.ssids[0].ssid = ssid->ssid;
 835                 params.ssids[0].ssid_len = ssid->ssid_len;
 836                 params.num_ssids = 1;
 837
 838                 /*
 839                  * Allocate memory for frequency array, allocate one extra
 840                  * slot for the zero-terminator.
 841                  */
 842                 params.freqs = os_malloc(sizeof(int) * 2);
 843                 if (params.freqs == NULL) {
 844                         wpa_dbg(wpa_s, MSG_ERROR, "Memory allocation failed");
 845                         return;
 846                 }
 847                 params.freqs[0] = wpa_s->assoc_freq;
 848                 params.freqs[1] = 0;
 849
 850                 /*
 851                  * Reset the reattach flag so that we fall back to full scan if
 852                  * this scan fails.
 853                  */
 854                 wpa_s->reattach = 0;
 855         } else {
 856                 struct wpa_ssid *start = ssid, *tssid;
 857                 int freqs_set = 0;
 858                 if (ssid == NULL && max_ssids > 1)
 859                         ssid = wpa_s->conf->ssid;
 860                 while (ssid) {
 861                         if (!wpas_network_disabled(wpa_s, ssid) &&
 862                             ssid->scan_ssid) {
 863                                 wpa_hexdump_ascii(MSG_DEBUG, "Scan SSID",
 864                                                   ssid->ssid, ssid->ssid_len);
 865                                 params.ssids[params.num_ssids].ssid =
 866                                         ssid->ssid;
 867                                 params.ssids[params.num_ssids].ssid_len =
 868                                         ssid->ssid_len;
 869                                 params.num_ssids++;
 870                                 if (params.num_ssids + 1 >= max_ssids)
 871                                         break;
 872                         }
 873                         ssid = ssid->next;
 874                         if (ssid == start)
 875                                 break;
 876                         if (ssid == NULL && max_ssids > 1 &&
 877                             start != wpa_s->conf->ssid)
 878                                 ssid = wpa_s->conf->ssid;
 879                 }
 880
 881                 if (wpa_s->scan_id_count &&
 882                     wpa_s->last_scan_req == MANUAL_SCAN_REQ)
 883                         wpa_set_scan_ssids(wpa_s, &params, max_ssids);
 884
 885                 for (tssid = wpa_s->conf->ssid;
 886                      wpa_s->last_scan_req != MANUAL_SCAN_REQ && tssid;
 887                      tssid = tssid->next) {
 888                         if (wpas_network_disabled(wpa_s, tssid))
 889                                 continue;
 890                         if ((params.freqs || !freqs_set) && tssid->scan_freq) {
 891                                 int_array_concat(&params.freqs,
 892                                                  tssid->scan_freq);
 893                         } else {
 894                                 os_free(params.freqs);
 895                                 params.freqs = NULL;
 896                         }
 897                         freqs_set = 1;
 898                 }
 899                 int_array_sort_unique(params.freqs);
 900         }
 901
 902         if (ssid && max_ssids == 1) {
 903                 /*
 904                  * If the driver is limited to 1 SSID at a time interleave
 905                  * wildcard SSID scans with specific SSID scans to avoid
 906                  * waiting a long time for a wildcard scan.
 907                  */
 908                 if (!wpa_s->prev_scan_wildcard) {
 909                         params.ssids[0].ssid = NULL;
 910                         params.ssids[0].ssid_len = 0;
 911                         wpa_s->prev_scan_wildcard = 1;
 912                         wpa_dbg(wpa_s, MSG_DEBUG, "Starting AP scan for "
 913                                 "wildcard SSID (Interleave with specific)");
 914                 } else {
 915                         wpa_s->prev_scan_ssid = ssid;
 916                         wpa_s->prev_scan_wildcard = 0;
 917                         wpa_dbg(wpa_s, MSG_DEBUG,
 918                                 "Starting AP scan for specific SSID: %s",
 919                                 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
 920                 }
 921         } else if (ssid) {
 922                 /* max_ssids > 1 */
 923
 924                 wpa_s->prev_scan_ssid = ssid;
 925                 wpa_dbg(wpa_s, MSG_DEBUG, "Include wildcard SSID in "
 926                         "the scan request");
 927                 params.num_ssids++;
 928         } else if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
 929                    wpa_s->manual_scan_passive && params.num_ssids == 0) {
 930                 wpa_dbg(wpa_s, MSG_DEBUG, "Use passive scan based on manual request");
 931         } else if (wpa_s->conf->passive_scan) {
 932                 wpa_dbg(wpa_s, MSG_DEBUG,
 933                         "Use passive scan based on configuration");
 934         } else {
 935                 wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
 936                 params.num_ssids++;
 937                 wpa_dbg(wpa_s, MSG_DEBUG, "Starting AP scan for wildcard "
 938                         "SSID");
 939         }
 940
 941 ssid_list_set:
 942         wpa_supplicant_optimize_freqs(wpa_s, &params);
 943         extra_ie = wpa_supplicant_extra_ies(wpa_s);
 944
 945         if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
 946             wpa_s->manual_scan_only_new) {
 947                 wpa_printf(MSG_DEBUG,
 948                            "Request driver to clear scan cache due to manual only_new=1 scan");
 949                 params.only_new_results = 1;
 950         }
 951
 952         if (wpa_s->last_scan_req == MANUAL_SCAN_REQ && params.freqs == NULL &&
 953             wpa_s->manual_scan_freqs) {
 954                 wpa_dbg(wpa_s, MSG_DEBUG, "Limit manual scan to specified channels");
 955                 params.freqs = wpa_s->manual_scan_freqs;
 956                 wpa_s->manual_scan_freqs = NULL;
 957         }
 958
 959         if (params.freqs == NULL && wpa_s->next_scan_freqs) {
 960                 wpa_dbg(wpa_s, MSG_DEBUG, "Optimize scan based on previously "
 961                         "generated frequency list");
 962                 params.freqs = wpa_s->next_scan_freqs;
 963         } else
 964                 os_free(wpa_s->next_scan_freqs);
 965         wpa_s->next_scan_freqs = NULL;
 966         wpa_setband_scan_freqs(wpa_s, &params);
 967
 968         /* See if user specified frequencies. If so, scan only those. */
 969         if (wpa_s->conf->freq_list && !params.freqs) {
 970                 wpa_dbg(wpa_s, MSG_DEBUG,
 971                         "Optimize scan based on conf->freq_list");
 972                 int_array_concat(&params.freqs, wpa_s->conf->freq_list);
 973         }
 974
 975         /* Use current associated channel? */
 976         if (wpa_s->conf->scan_cur_freq && !params.freqs) {
 977                 unsigned int num = wpa_s->num_multichan_concurrent;
 978
 979                 params.freqs = os_calloc(num + 1, sizeof(int));
 980                 if (params.freqs) {
 981                         num = get_shared_radio_freqs(wpa_s, params.freqs, num);
 982                         if (num > 0) {
 983                                 wpa_dbg(wpa_s, MSG_DEBUG, "Scan only the "
 984                                         "current operating channels since "
 985                                         "scan_cur_freq is enabled");
 986                         } else {
 987                                 os_free(params.freqs);
 988                                 params.freqs = NULL;
 989                         }
 990                 }
 991         }
 992
 993         params.filter_ssids = wpa_supplicant_build_filter_ssids(
 994                 wpa_s->conf, &params.num_filter_ssids);
 995         if (extra_ie) {
 996                 params.extra_ies = wpabuf_head(extra_ie);
 997                 params.extra_ies_len = wpabuf_len(extra_ie);
 998         }
 999
1000 #ifdef CONFIG_P2P
1001         if (wpa_s->p2p_in_provisioning || wpa_s->p2p_in_invitation ||
1002             (wpa_s->show_group_started && wpa_s->go_params)) {
1003                 /*
1004                  * The interface may not yet be in P2P mode, so we have to
1005                  * explicitly request P2P probe to disable CCK rates.
1006                  */
1007                 params.p2p_probe = 1;
1008         }
1009 #endif /* CONFIG_P2P */
1010
1011         if (wpa_s->mac_addr_rand_enable & MAC_ADDR_RAND_SCAN) {
1012                 params.mac_addr_rand = 1;
1013                 if (wpa_s->mac_addr_scan) {
1014                         params.mac_addr = wpa_s->mac_addr_scan;
1015                         params.mac_addr_mask = wpa_s->mac_addr_scan + ETH_ALEN;
1016                 }
1017         }
1018
1019         scan_params = &params;
1020
1021 scan:
1022 #ifdef CONFIG_P2P
1023         /*
1024          * If the driver does not support multi-channel concurrency and a
1025          * virtual interface that shares the same radio with the wpa_s interface
1026          * is operating there may not be need to scan other channels apart from
1027          * the current operating channel on the other virtual interface. Filter
1028          * out other channels in case we are trying to find a connection for a
1029          * station interface when we are not configured to prefer station
1030          * connection and a concurrent operation is already in process.
1031          */
1032         if (wpa_s->scan_for_connection &&
1033             wpa_s->last_scan_req == NORMAL_SCAN_REQ &&
1034             !scan_params->freqs && !params.freqs &&
1035             wpas_is_p2p_prioritized(wpa_s) &&
1036             wpa_s->p2p_group_interface == NOT_P2P_GROUP_INTERFACE &&
1037             non_p2p_network_enabled(wpa_s)) {
1038                 unsigned int num = wpa_s->num_multichan_concurrent;
1039
1040                 params.freqs = os_calloc(num + 1, sizeof(int));
1041                 if (params.freqs) {
1042                         num = get_shared_radio_freqs(wpa_s, params.freqs, num);
1043                         if (num > 0 && num == wpa_s->num_multichan_concurrent) {
1044                                 wpa_dbg(wpa_s, MSG_DEBUG, "Scan only the current operating channels since all channels are already used");
1045                         } else {
1046                                 os_free(params.freqs);
1047                                 params.freqs = NULL;
1048                         }
1049                 }
1050         }
1051 #endif /* CONFIG_P2P */
1052
1053         ret = wpa_supplicant_trigger_scan(wpa_s, scan_params);
1054
1055         if (ret && wpa_s->last_scan_req == MANUAL_SCAN_REQ && params.freqs &&
1056             !wpa_s->manual_scan_freqs) {
1057                 /* Restore manual_scan_freqs for the next attempt */
1058                 wpa_s->manual_scan_freqs = params.freqs;
1059                 params.freqs = NULL;
1060         }
1061
1062         wpabuf_free(extra_ie);
1063         os_free(params.freqs);
1064         os_free(params.filter_ssids);
1065
1066         if (ret) {
1067                 wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate AP scan");
1068                 if (wpa_s->scan_prev_wpa_state != wpa_s->wpa_state)
1069                         wpa_supplicant_set_state(wpa_s,
1070                                                  wpa_s->scan_prev_wpa_state);
1071                 /* Restore scan_req since we will try to scan again */
1072                 wpa_s->scan_req = wpa_s->last_scan_req;
1073                 wpa_supplicant_req_scan(wpa_s, 1, 0);
1074         } else {
1075                 wpa_s->scan_for_connection = 0;
1076 #ifdef CONFIG_INTERWORKING
1077                 wpa_s->interworking_fast_assoc_tried = 0;
1078 #endif /* CONFIG_INTERWORKING */
1079         }
1080 }
1081
1082
1083 void wpa_supplicant_update_scan_int(struct wpa_supplicant *wpa_s, int sec)
1084 {
1085         struct os_reltime remaining, new_int;
1086         int cancelled;
1087
1088         cancelled = eloop_cancel_timeout_one(wpa_supplicant_scan, wpa_s, NULL,
1089                                              &remaining);
1090
1091         new_int.sec = sec;
1092         new_int.usec = 0;
1093         if (cancelled && os_reltime_before(&remaining, &new_int)) {
1094                 new_int.sec = remaining.sec;
1095                 new_int.usec = remaining.usec;
1096         }
1097
1098         if (cancelled) {
1099                 eloop_register_timeout(new_int.sec, new_int.usec,
1100                                        wpa_supplicant_scan, wpa_s, NULL);
1101         }
1102         wpa_s->scan_interval = sec;
1103 }
1104
1105
1106 /**
1107  * wpa_supplicant_req_scan - Schedule a scan for neighboring access points
1108  * @wpa_s: Pointer to wpa_supplicant data
1109  * @sec: Number of seconds after which to scan
1110  * @usec: Number of microseconds after which to scan
1111  *
1112  * This function is used to schedule a scan for neighboring access points after
1113  * the specified time.
1114  */
1115 void wpa_supplicant_req_scan(struct wpa_supplicant *wpa_s, int sec, int usec)
1116 {
1117         int res;
1118
1119         if (wpa_s->p2p_mgmt) {
1120                 wpa_dbg(wpa_s, MSG_DEBUG,
1121                         "Ignore scan request (%d.%06d sec) on p2p_mgmt interface",
1122                         sec, usec);
1123                 return;
1124         }
1125
1126         res = eloop_deplete_timeout(sec, usec, wpa_supplicant_scan, wpa_s,
1127                                     NULL);
1128         if (res == 1) {
1129                 wpa_dbg(wpa_s, MSG_DEBUG, "Rescheduling scan request: %d.%06d sec",
1130                         sec, usec);
1131         } else if (res == 0) {
1132                 wpa_dbg(wpa_s, MSG_DEBUG, "Ignore new scan request for %d.%06d sec since an earlier request is scheduled to trigger sooner",
1133                         sec, usec);
1134         } else {
1135                 wpa_dbg(wpa_s, MSG_DEBUG, "Setting scan request: %d.%06d sec",
1136                         sec, usec);
1137                 eloop_register_timeout(sec, usec, wpa_supplicant_scan, wpa_s, NULL);
1138         }
1139 }
1140
1141
1142 /**
1143  * wpa_supplicant_delayed_sched_scan - Request a delayed scheduled scan
1144  * @wpa_s: Pointer to wpa_supplicant data
1145  * @sec: Number of seconds after which to scan
1146  * @usec: Number of microseconds after which to scan
1147  * Returns: 0 on success or -1 otherwise
1148  *
1149  * This function is used to schedule periodic scans for neighboring
1150  * access points after the specified time.
1151  */
1152 int wpa_supplicant_delayed_sched_scan(struct wpa_supplicant *wpa_s,
1153                                       int sec, int usec)
1154 {
1155         if (!wpa_s->sched_scan_supported)
1156                 return -1;
1157
1158         eloop_register_timeout(sec, usec,
1159                                wpa_supplicant_delayed_sched_scan_timeout,
1160                                wpa_s, NULL);
1161
1162         return 0;
1163 }
1164
1165
1166 /**
1167  * wpa_supplicant_req_sched_scan - Start a periodic scheduled scan
1168  * @wpa_s: Pointer to wpa_supplicant data
1169  * Returns: 0 is sched_scan was started or -1 otherwise
1170  *
1171  * This function is used to schedule periodic scans for neighboring
1172  * access points repeating the scan continuously.
1173  */
1174 int wpa_supplicant_req_sched_scan(struct wpa_supplicant *wpa_s)
1175 {
1176         struct wpa_driver_scan_params params;
1177         struct wpa_driver_scan_params *scan_params;
1178         enum wpa_states prev_state;
1179         struct wpa_ssid *ssid = NULL;
1180         struct wpabuf *extra_ie = NULL;
1181         int ret;
1182         unsigned int max_sched_scan_ssids;
1183         int wildcard = 0;
1184         int need_ssids;
1185
1186         if (!wpa_s->sched_scan_supported)
1187                 return -1;
1188
1189         if (wpa_s->max_sched_scan_ssids > WPAS_MAX_SCAN_SSIDS)
1190                 max_sched_scan_ssids = WPAS_MAX_SCAN_SSIDS;
1191         else
1192                 max_sched_scan_ssids = wpa_s->max_sched_scan_ssids;
1193         if (max_sched_scan_ssids < 1 || wpa_s->conf->disable_scan_offload)
1194                 return -1;
1195
1196         if (wpa_s->sched_scanning) {
1197                 wpa_dbg(wpa_s, MSG_DEBUG, "Already sched scanning");
1198                 return 0;
1199         }
1200
1201         need_ssids = 0;
1202         for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
1203                 if (!wpas_network_disabled(wpa_s, ssid) && !ssid->scan_ssid) {
1204                         /* Use wildcard SSID to find this network */
1205                         wildcard = 1;
1206                 } else if (!wpas_network_disabled(wpa_s, ssid) &&
1207                            ssid->ssid_len)
1208                         need_ssids++;
1209
1210 #ifdef CONFIG_WPS
1211                 if (!wpas_network_disabled(wpa_s, ssid) &&
1212                     ssid->key_mgmt == WPA_KEY_MGMT_WPS) {
1213                         /*
1214                          * Normal scan is more reliable and faster for WPS
1215                          * operations and since these are for short periods of
1216                          * time, the benefit of trying to use sched_scan would
1217                          * be limited.
1218                          */
1219                         wpa_dbg(wpa_s, MSG_DEBUG, "Use normal scan instead of "
1220                                 "sched_scan for WPS");
1221                         return -1;
1222                 }
1223 #endif /* CONFIG_WPS */
1224         }
1225         if (wildcard)
1226                 need_ssids++;
1227
1228         if (wpa_s->normal_scans < 3 &&
1229             (need_ssids <= wpa_s->max_scan_ssids ||
1230              wpa_s->max_scan_ssids >= (int) max_sched_scan_ssids)) {
1231                 /*
1232                  * When normal scan can speed up operations, use that for the
1233                  * first operations before starting the sched_scan to allow
1234                  * user space sleep more. We do this only if the normal scan
1235                  * has functionality that is suitable for this or if the
1236                  * sched_scan does not have better support for multiple SSIDs.
1237                  */
1238                 wpa_dbg(wpa_s, MSG_DEBUG, "Use normal scan instead of "
1239                         "sched_scan for initial scans (normal_scans=%d)",
1240                         wpa_s->normal_scans);
1241                 return -1;
1242         }
1243
1244         os_memset(&params, 0, sizeof(params));
1245
1246         /* If we can't allocate space for the filters, we just don't filter */
1247         params.filter_ssids = os_calloc(wpa_s->max_match_sets,
1248                                         sizeof(struct wpa_driver_scan_filter));
1249
1250         prev_state = wpa_s->wpa_state;
1251         if (wpa_s->wpa_state == WPA_DISCONNECTED ||
1252             wpa_s->wpa_state == WPA_INACTIVE)
1253                 wpa_supplicant_set_state(wpa_s, WPA_SCANNING);
1254
1255         if (wpa_s->autoscan_params != NULL) {
1256                 scan_params = wpa_s->autoscan_params;
1257                 goto scan;
1258         }
1259
1260         /* Find the starting point from which to continue scanning */
1261         ssid = wpa_s->conf->ssid;
1262         if (wpa_s->prev_sched_ssid) {
1263                 while (ssid) {
1264                         if (ssid == wpa_s->prev_sched_ssid) {
1265                                 ssid = ssid->next;
1266                                 break;
1267                         }
1268                         ssid = ssid->next;
1269                 }
1270         }
1271
1272         if (!ssid || !wpa_s->prev_sched_ssid) {
1273                 wpa_dbg(wpa_s, MSG_DEBUG, "Beginning of SSID list");
1274                 if (wpa_s->conf->sched_scan_interval)
1275                         wpa_s->sched_scan_interval =
1276                                 wpa_s->conf->sched_scan_interval;
1277                 if (wpa_s->sched_scan_interval == 0)
1278                         wpa_s->sched_scan_interval = 10;
1279                 wpa_s->sched_scan_timeout = max_sched_scan_ssids * 2;
1280                 wpa_s->first_sched_scan = 1;
1281                 ssid = wpa_s->conf->ssid;
1282                 wpa_s->prev_sched_ssid = ssid;
1283         }
1284
1285         if (wildcard) {
1286                 wpa_dbg(wpa_s, MSG_DEBUG, "Add wildcard SSID to sched_scan");
1287                 params.num_ssids++;
1288         }
1289
1290         while (ssid) {
1291                 if (wpas_network_disabled(wpa_s, ssid))
1292                         goto next;
1293
1294                 if (params.num_filter_ssids < wpa_s->max_match_sets &&
1295                     params.filter_ssids && ssid->ssid && ssid->ssid_len) {
1296                         wpa_dbg(wpa_s, MSG_DEBUG, "add to filter ssid: %s",
1297                                 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
1298                         os_memcpy(params.filter_ssids[params.num_filter_ssids].ssid,
1299                                   ssid->ssid, ssid->ssid_len);
1300                         params.filter_ssids[params.num_filter_ssids].ssid_len =
1301                                 ssid->ssid_len;
1302                         params.num_filter_ssids++;
1303                 } else if (params.filter_ssids && ssid->ssid && ssid->ssid_len)
1304                 {
1305                         wpa_dbg(wpa_s, MSG_DEBUG, "Not enough room for SSID "
1306                                 "filter for sched_scan - drop filter");
1307                         os_free(params.filter_ssids);
1308                         params.filter_ssids = NULL;
1309                         params.num_filter_ssids = 0;
1310                 }
1311
1312                 if (ssid->scan_ssid && ssid->ssid && ssid->ssid_len) {
1313                         if (params.num_ssids == max_sched_scan_ssids)
1314                                 break; /* only room for broadcast SSID */
1315                         wpa_dbg(wpa_s, MSG_DEBUG,
1316                                 "add to active scan ssid: %s",
1317                                 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
1318                         params.ssids[params.num_ssids].ssid =
1319                                 ssid->ssid;
1320                         params.ssids[params.num_ssids].ssid_len =
1321                                 ssid->ssid_len;
1322                         params.num_ssids++;
1323                         if (params.num_ssids >= max_sched_scan_ssids) {
1324                                 wpa_s->prev_sched_ssid = ssid;
1325                                 do {
1326                                         ssid = ssid->next;
1327                                 } while (ssid &&
1328                                          (wpas_network_disabled(wpa_s, ssid) ||
1329                                           !ssid->scan_ssid));
1330                                 break;
1331                         }
1332                 }
1333
1334         next:
1335                 wpa_s->prev_sched_ssid = ssid;
1336                 ssid = ssid->next;
1337         }
1338
1339         if (params.num_filter_ssids == 0) {
1340                 os_free(params.filter_ssids);
1341                 params.filter_ssids = NULL;
1342         }
1343
1344         extra_ie = wpa_supplicant_extra_ies(wpa_s);
1345         if (extra_ie) {
1346                 params.extra_ies = wpabuf_head(extra_ie);
1347                 params.extra_ies_len = wpabuf_len(extra_ie);
1348         }
1349
1350         if (wpa_s->conf->filter_rssi)
1351                 params.filter_rssi = wpa_s->conf->filter_rssi;
1352
1353         /* See if user specified frequencies. If so, scan only those. */
1354         if (wpa_s->conf->freq_list && !params.freqs) {
1355                 wpa_dbg(wpa_s, MSG_DEBUG,
1356                         "Optimize scan based on conf->freq_list");
1357                 int_array_concat(&params.freqs, wpa_s->conf->freq_list);
1358         }
1359
1360         scan_params = &params;
1361
1362 scan:
1363         if (ssid || !wpa_s->first_sched_scan) {
1364                 wpa_dbg(wpa_s, MSG_DEBUG,
1365                         "Starting sched scan: interval %d timeout %d",
1366                         wpa_s->sched_scan_interval, wpa_s->sched_scan_timeout);
1367         } else {
1368                 wpa_dbg(wpa_s, MSG_DEBUG,
1369                         "Starting sched scan: interval %d (no timeout)",
1370                         wpa_s->sched_scan_interval);
1371         }
1372
1373         wpa_setband_scan_freqs(wpa_s, scan_params);
1374
1375         if (wpa_s->mac_addr_rand_enable & MAC_ADDR_RAND_SCHED_SCAN) {
1376                 params.mac_addr_rand = 1;
1377                 if (wpa_s->mac_addr_sched_scan) {
1378                         params.mac_addr = wpa_s->mac_addr_sched_scan;
1379                         params.mac_addr_mask = wpa_s->mac_addr_sched_scan +
1380                                 ETH_ALEN;
1381                 }
1382         }
1383
1384         ret = wpa_supplicant_start_sched_scan(wpa_s, scan_params,
1385                                               wpa_s->sched_scan_interval);
1386         wpabuf_free(extra_ie);
1387         os_free(params.filter_ssids);
1388         if (ret) {
1389                 wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate sched scan");
1390                 if (prev_state != wpa_s->wpa_state)
1391                         wpa_supplicant_set_state(wpa_s, prev_state);
1392                 return ret;
1393         }
1394
1395         /* If we have more SSIDs to scan, add a timeout so we scan them too */
1396         if (ssid || !wpa_s->first_sched_scan) {
1397                 wpa_s->sched_scan_timed_out = 0;
1398                 eloop_register_timeout(wpa_s->sched_scan_timeout, 0,
1399                                        wpa_supplicant_sched_scan_timeout,
1400                                        wpa_s, NULL);
1401                 wpa_s->first_sched_scan = 0;
1402                 wpa_s->sched_scan_timeout /= 2;
1403                 wpa_s->sched_scan_interval *= 2;
1404                 if (wpa_s->sched_scan_timeout < wpa_s->sched_scan_interval) {
1405                         wpa_s->sched_scan_interval = 10;
1406                         wpa_s->sched_scan_timeout = max_sched_scan_ssids * 2;
1407                 }
1408         }
1409
1410         /* If there is no more ssids, start next time from the beginning */
1411         if (!ssid)
1412                 wpa_s->prev_sched_ssid = NULL;
1413
1414         return 0;
1415 }
1416
1417
1418 /**
1419  * wpa_supplicant_cancel_scan - Cancel a scheduled scan request
1420  * @wpa_s: Pointer to wpa_supplicant data
1421  *
1422  * This function is used to cancel a scan request scheduled with
1423  * wpa_supplicant_req_scan().
1424  */
1425 void wpa_supplicant_cancel_scan(struct wpa_supplicant *wpa_s)
1426 {
1427         wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling scan request");
1428         eloop_cancel_timeout(wpa_supplicant_scan, wpa_s, NULL);
1429 }
1430
1431
1432 /**
1433  * wpa_supplicant_cancel_delayed_sched_scan - Stop a delayed scheduled scan
1434  * @wpa_s: Pointer to wpa_supplicant data
1435  *
1436  * This function is used to stop a delayed scheduled scan.
1437  */
1438 void wpa_supplicant_cancel_delayed_sched_scan(struct wpa_supplicant *wpa_s)
1439 {
1440         if (!wpa_s->sched_scan_supported)
1441                 return;
1442
1443         wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling delayed sched scan");
1444         eloop_cancel_timeout(wpa_supplicant_delayed_sched_scan_timeout,
1445                              wpa_s, NULL);
1446 }
1447
1448
1449 /**
1450  * wpa_supplicant_cancel_sched_scan - Stop running scheduled scans
1451  * @wpa_s: Pointer to wpa_supplicant data
1452  *
1453  * This function is used to stop a periodic scheduled scan.
1454  */
1455 void wpa_supplicant_cancel_sched_scan(struct wpa_supplicant *wpa_s)
1456 {
1457         if (!wpa_s->sched_scanning)
1458                 return;
1459
1460         wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling sched scan");
1461         eloop_cancel_timeout(wpa_supplicant_sched_scan_timeout, wpa_s, NULL);
1462         wpa_supplicant_stop_sched_scan(wpa_s);
1463 }
1464
1465
1466 /**
1467  * wpa_supplicant_notify_scanning - Indicate possible scan state change
1468  * @wpa_s: Pointer to wpa_supplicant data
1469  * @scanning: Whether scanning is currently in progress
1470  *
1471  * This function is to generate scanning notifycations. It is called whenever
1472  * there may have been a change in scanning (scan started, completed, stopped).
1473  * wpas_notify_scanning() is called whenever the scanning state changed from the
1474  * previously notified state.
1475  */
1476 void wpa_supplicant_notify_scanning(struct wpa_supplicant *wpa_s,
1477                                     int scanning)
1478 {
1479         if (wpa_s->scanning != scanning) {
1480                 wpa_s->scanning = scanning;
1481                 wpas_notify_scanning(wpa_s);
1482         }
1483 }
1484
1485
1486 static int wpa_scan_get_max_rate(const struct wpa_scan_res *res)
1487 {
1488         int rate = 0;
1489         const u8 *ie;
1490         int i;
1491
1492         ie = wpa_scan_get_ie(res, WLAN_EID_SUPP_RATES);
1493         for (i = 0; ie && i < ie[1]; i++) {
1494                 if ((ie[i + 2] & 0x7f) > rate)
1495                         rate = ie[i + 2] & 0x7f;
1496         }
1497
1498         ie = wpa_scan_get_ie(res, WLAN_EID_EXT_SUPP_RATES);
1499         for (i = 0; ie && i < ie[1]; i++) {
1500                 if ((ie[i + 2] & 0x7f) > rate)
1501                         rate = ie[i + 2] & 0x7f;
1502         }
1503
1504         return rate;
1505 }
1506
1507
1508 /**
1509  * wpa_scan_get_ie - Fetch a specified information element from a scan result
1510  * @res: Scan result entry
1511  * @ie: Information element identitifier (WLAN_EID_*)
1512  * Returns: Pointer to the information element (id field) or %NULL if not found
1513  *
1514  * This function returns the first matching information element in the scan
1515  * result.
1516  */
1517 const u8 * wpa_scan_get_ie(const struct wpa_scan_res *res, u8 ie)
1518 {
1519         const u8 *end, *pos;
1520
1521         pos = (const u8 *) (res + 1);
1522         end = pos + res->ie_len;
1523
1524         while (pos + 1 < end) {
1525                 if (pos + 2 + pos[1] > end)
1526                         break;
1527                 if (pos[0] == ie)
1528                         return pos;
1529                 pos += 2 + pos[1];
1530         }
1531
1532         return NULL;
1533 }
1534
1535
1536 /**
1537  * wpa_scan_get_vendor_ie - Fetch vendor information element from a scan result
1538  * @res: Scan result entry
1539  * @vendor_type: Vendor type (four octets starting the IE payload)
1540  * Returns: Pointer to the information element (id field) or %NULL if not found
1541  *
1542  * This function returns the first matching information element in the scan
1543  * result.
1544  */
1545 const u8 * wpa_scan_get_vendor_ie(const struct wpa_scan_res *res,
1546                                   u32 vendor_type)
1547 {
1548         const u8 *end, *pos;
1549
1550         pos = (const u8 *) (res + 1);
1551         end = pos + res->ie_len;
1552
1553         while (pos + 1 < end) {
1554                 if (pos + 2 + pos[1] > end)
1555                         break;
1556                 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1557                     vendor_type == WPA_GET_BE32(&pos[2]))
1558                         return pos;
1559                 pos += 2 + pos[1];
1560         }
1561
1562         return NULL;
1563 }
1564
1565
1566 /**
1567  * wpa_scan_get_vendor_ie_beacon - Fetch vendor information from a scan result
1568  * @res: Scan result entry
1569  * @vendor_type: Vendor type (four octets starting the IE payload)
1570  * Returns: Pointer to the information element (id field) or %NULL if not found
1571  *
1572  * This function returns the first matching information element in the scan
1573  * result.
1574  *
1575  * This function is like wpa_scan_get_vendor_ie(), but uses IE buffer only
1576  * from Beacon frames instead of either Beacon or Probe Response frames.
1577  */
1578 const u8 * wpa_scan_get_vendor_ie_beacon(const struct wpa_scan_res *res,
1579                                          u32 vendor_type)
1580 {
1581         const u8 *end, *pos;
1582
1583         if (res->beacon_ie_len == 0)
1584                 return NULL;
1585
1586         pos = (const u8 *) (res + 1);
1587         pos += res->ie_len;
1588         end = pos + res->beacon_ie_len;
1589
1590         while (pos + 1 < end) {
1591                 if (pos + 2 + pos[1] > end)
1592                         break;
1593                 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1594                     vendor_type == WPA_GET_BE32(&pos[2]))
1595                         return pos;
1596                 pos += 2 + pos[1];
1597         }
1598
1599         return NULL;
1600 }
1601
1602
1603 /**
1604  * wpa_scan_get_vendor_ie_multi - Fetch vendor IE data from a scan result
1605  * @res: Scan result entry
1606  * @vendor_type: Vendor type (four octets starting the IE payload)
1607  * Returns: Pointer to the information element payload or %NULL if not found
1608  *
1609  * This function returns concatenated payload of possibly fragmented vendor
1610  * specific information elements in the scan result. The caller is responsible
1611  * for freeing the returned buffer.
1612  */
1613 struct wpabuf * wpa_scan_get_vendor_ie_multi(const struct wpa_scan_res *res,
1614                                              u32 vendor_type)
1615 {
1616         struct wpabuf *buf;
1617         const u8 *end, *pos;
1618
1619         buf = wpabuf_alloc(res->ie_len);
1620         if (buf == NULL)
1621                 return NULL;
1622
1623         pos = (const u8 *) (res + 1);
1624         end = pos + res->ie_len;
1625
1626         while (pos + 1 < end) {
1627                 if (pos + 2 + pos[1] > end)
1628                         break;
1629                 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1630                     vendor_type == WPA_GET_BE32(&pos[2]))
1631                         wpabuf_put_data(buf, pos + 2 + 4, pos[1] - 4);
1632                 pos += 2 + pos[1];
1633         }
1634
1635         if (wpabuf_len(buf) == 0) {
1636                 wpabuf_free(buf);
1637                 buf = NULL;
1638         }
1639
1640         return buf;
1641 }
1642
1643
1644 /*
1645  * Channels with a great SNR can operate at full rate. What is a great SNR?
1646  * This doc https://supportforums.cisco.com/docs/DOC-12954 says, "the general
1647  * rule of thumb is that any SNR above 20 is good." This one
1648  * http://www.cisco.com/en/US/tech/tk722/tk809/technologies_q_and_a_item09186a00805e9a96.shtml#qa23
1649  * recommends 25 as a minimum SNR for 54 Mbps data rate. 30 is chosen here as a
1650  * conservative value.
1651  */
1652 #define GREAT_SNR 30
1653
1654 #define IS_5GHZ(n) (n > 4000)
1655
1656 /* Compare function for sorting scan results. Return >0 if @b is considered
1657  * better. */
1658 static int wpa_scan_result_compar(const void *a, const void *b)
1659 {
1660 #define MIN(a,b) a < b ? a : b
1661         struct wpa_scan_res **_wa = (void *) a;
1662         struct wpa_scan_res **_wb = (void *) b;
1663         struct wpa_scan_res *wa = *_wa;
1664         struct wpa_scan_res *wb = *_wb;
1665         int wpa_a, wpa_b;
1666         int snr_a, snr_b, snr_a_full, snr_b_full;
1667
1668         /* WPA/WPA2 support preferred */
1669         wpa_a = wpa_scan_get_vendor_ie(wa, WPA_IE_VENDOR_TYPE) != NULL ||
1670                 wpa_scan_get_ie(wa, WLAN_EID_RSN) != NULL;
1671         wpa_b = wpa_scan_get_vendor_ie(wb, WPA_IE_VENDOR_TYPE) != NULL ||
1672                 wpa_scan_get_ie(wb, WLAN_EID_RSN) != NULL;
1673
1674         if (wpa_b && !wpa_a)
1675                 return 1;
1676         if (!wpa_b && wpa_a)
1677                 return -1;
1678
1679         /* privacy support preferred */
1680         if ((wa->caps & IEEE80211_CAP_PRIVACY) == 0 &&
1681             (wb->caps & IEEE80211_CAP_PRIVACY))
1682                 return 1;
1683         if ((wa->caps & IEEE80211_CAP_PRIVACY) &&
1684             (wb->caps & IEEE80211_CAP_PRIVACY) == 0)
1685                 return -1;
1686
1687         if (wa->flags & wb->flags & WPA_SCAN_LEVEL_DBM) {
1688                 snr_a_full = wa->snr;
1689                 snr_a = MIN(wa->snr, GREAT_SNR);
1690                 snr_b_full = wb->snr;
1691                 snr_b = MIN(wb->snr, GREAT_SNR);
1692         } else {
1693                 /* Level is not in dBm, so we can't calculate
1694                  * SNR. Just use raw level (units unknown). */
1695                 snr_a = snr_a_full = wa->level;
1696                 snr_b = snr_b_full = wb->level;
1697         }
1698
1699         /* if SNR is close, decide by max rate or frequency band */
1700         if ((snr_a && snr_b && abs(snr_b - snr_a) < 5) ||
1701             (wa->qual && wb->qual && abs(wb->qual - wa->qual) < 10)) {
1702                 if (wa->est_throughput != wb->est_throughput)
1703                         return wb->est_throughput - wa->est_throughput;
1704                 if (IS_5GHZ(wa->freq) ^ IS_5GHZ(wb->freq))
1705                         return IS_5GHZ(wa->freq) ? -1 : 1;
1706         }
1707
1708         /* all things being equal, use SNR; if SNRs are
1709          * identical, use quality values since some drivers may only report
1710          * that value and leave the signal level zero */
1711         if (snr_b_full == snr_a_full)
1712                 return wb->qual - wa->qual;
1713         return snr_b_full - snr_a_full;
1714 #undef MIN
1715 }
1716
1717
1718 #ifdef CONFIG_WPS
1719 /* Compare function for sorting scan results when searching a WPS AP for
1720  * provisioning. Return >0 if @b is considered better. */
1721 static int wpa_scan_result_wps_compar(const void *a, const void *b)
1722 {
1723         struct wpa_scan_res **_wa = (void *) a;
1724         struct wpa_scan_res **_wb = (void *) b;
1725         struct wpa_scan_res *wa = *_wa;
1726         struct wpa_scan_res *wb = *_wb;
1727         int uses_wps_a, uses_wps_b;
1728         struct wpabuf *wps_a, *wps_b;
1729         int res;
1730
1731         /* Optimization - check WPS IE existence before allocated memory and
1732          * doing full reassembly. */
1733         uses_wps_a = wpa_scan_get_vendor_ie(wa, WPS_IE_VENDOR_TYPE) != NULL;
1734         uses_wps_b = wpa_scan_get_vendor_ie(wb, WPS_IE_VENDOR_TYPE) != NULL;
1735         if (uses_wps_a && !uses_wps_b)
1736                 return -1;
1737         if (!uses_wps_a && uses_wps_b)
1738                 return 1;
1739
1740         if (uses_wps_a && uses_wps_b) {
1741                 wps_a = wpa_scan_get_vendor_ie_multi(wa, WPS_IE_VENDOR_TYPE);
1742                 wps_b = wpa_scan_get_vendor_ie_multi(wb, WPS_IE_VENDOR_TYPE);
1743                 res = wps_ap_priority_compar(wps_a, wps_b);
1744                 wpabuf_free(wps_a);
1745                 wpabuf_free(wps_b);
1746                 if (res)
1747                         return res;
1748         }
1749
1750         /*
1751          * Do not use current AP security policy as a sorting criteria during
1752          * WPS provisioning step since the AP may get reconfigured at the
1753          * completion of provisioning.
1754          */
1755
1756         /* all things being equal, use signal level; if signal levels are
1757          * identical, use quality values since some drivers may only report
1758          * that value and leave the signal level zero */
1759         if (wb->level == wa->level)
1760                 return wb->qual - wa->qual;
1761         return wb->level - wa->level;
1762 }
1763 #endif /* CONFIG_WPS */
1764
1765
1766 static void dump_scan_res(struct wpa_scan_results *scan_res)
1767 {
1768 #ifndef CONFIG_NO_STDOUT_DEBUG
1769         size_t i;
1770
1771         if (scan_res->res == NULL || scan_res->num == 0)
1772                 return;
1773
1774         wpa_printf(MSG_EXCESSIVE, "Sorted scan results");
1775
1776         for (i = 0; i < scan_res->num; i++) {
1777                 struct wpa_scan_res *r = scan_res->res[i];
1778                 u8 *pos;
1779                 if (r->flags & WPA_SCAN_LEVEL_DBM) {
1780                         int noise_valid = !(r->flags & WPA_SCAN_NOISE_INVALID);
1781
1782                         wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d "
1783                                    "noise=%d%s level=%d snr=%d%s flags=0x%x age=%u est=%u",
1784                                    MAC2STR(r->bssid), r->freq, r->qual,
1785                                    r->noise, noise_valid ? "" : "~", r->level,
1786                                    r->snr, r->snr >= GREAT_SNR ? "*" : "",
1787                                    r->flags,
1788                                    r->age, r->est_throughput);
1789                 } else {
1790                         wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d "
1791                                    "noise=%d level=%d flags=0x%x age=%u est=%u",
1792                                    MAC2STR(r->bssid), r->freq, r->qual,
1793                                    r->noise, r->level, r->flags, r->age,
1794                                    r->est_throughput);
1795                 }
1796                 pos = (u8 *) (r + 1);
1797                 if (r->ie_len)
1798                         wpa_hexdump(MSG_EXCESSIVE, "IEs", pos, r->ie_len);
1799                 pos += r->ie_len;
1800                 if (r->beacon_ie_len)
1801                         wpa_hexdump(MSG_EXCESSIVE, "Beacon IEs",
1802                                     pos, r->beacon_ie_len);
1803         }
1804 #endif /* CONFIG_NO_STDOUT_DEBUG */
1805 }
1806
1807
1808 /**
1809  * wpa_supplicant_filter_bssid_match - Is the specified BSSID allowed
1810  * @wpa_s: Pointer to wpa_supplicant data
1811  * @bssid: BSSID to check
1812  * Returns: 0 if the BSSID is filtered or 1 if not
1813  *
1814  * This function is used to filter out specific BSSIDs from scan reslts mainly
1815  * for testing purposes (SET bssid_filter ctrl_iface command).
1816  */
1817 int wpa_supplicant_filter_bssid_match(struct wpa_supplicant *wpa_s,
1818                                       const u8 *bssid)
1819 {
1820         size_t i;
1821
1822         if (wpa_s->bssid_filter == NULL)
1823                 return 1;
1824
1825         for (i = 0; i < wpa_s->bssid_filter_count; i++) {
1826                 if (os_memcmp(wpa_s->bssid_filter + i * ETH_ALEN, bssid,
1827                               ETH_ALEN) == 0)
1828                         return 1;
1829         }
1830
1831         return 0;
1832 }
1833
1834
1835 static void filter_scan_res(struct wpa_supplicant *wpa_s,
1836                             struct wpa_scan_results *res)
1837 {
1838         size_t i, j;
1839
1840         if (wpa_s->bssid_filter == NULL)
1841                 return;
1842
1843         for (i = 0, j = 0; i < res->num; i++) {
1844                 if (wpa_supplicant_filter_bssid_match(wpa_s,
1845                                                       res->res[i]->bssid)) {
1846                         res->res[j++] = res->res[i];
1847                 } else {
1848                         os_free(res->res[i]);
1849                         res->res[i] = NULL;
1850                 }
1851         }
1852
1853         if (res->num != j) {
1854                 wpa_printf(MSG_DEBUG, "Filtered out %d scan results",
1855                            (int) (res->num - j));
1856                 res->num = j;
1857         }
1858 }
1859
1860
1861 /*
1862  * Noise floor values to use when we have signal strength
1863  * measurements, but no noise floor measurments. These values were
1864  * measured in an office environment with many APs.
1865  */
1866 #define DEFAULT_NOISE_FLOOR_2GHZ (-89)
1867 #define DEFAULT_NOISE_FLOOR_5GHZ (-92)
1868
1869 static void scan_snr(struct wpa_scan_res *res)
1870 {
1871         if (res->flags & WPA_SCAN_NOISE_INVALID) {
1872                 res->noise = IS_5GHZ(res->freq) ?
1873                         DEFAULT_NOISE_FLOOR_5GHZ :
1874                         DEFAULT_NOISE_FLOOR_2GHZ;
1875         }
1876
1877         if (res->flags & WPA_SCAN_LEVEL_DBM) {
1878                 res->snr = res->level - res->noise;
1879         } else {
1880                 /* Level is not in dBm, so we can't calculate
1881                  * SNR. Just use raw level (units unknown). */
1882                 res->snr = res->level;
1883         }
1884 }
1885
1886
1887 static unsigned int max_ht20_rate(int snr)
1888 {
1889         if (snr < 6)
1890                 return 6500; /* HT20 MCS0 */
1891         if (snr < 8)
1892                 return 13000; /* HT20 MCS1 */
1893         if (snr < 13)
1894                 return 19500; /* HT20 MCS2 */
1895         if (snr < 17)
1896                 return 26000; /* HT20 MCS3 */
1897         if (snr < 20)
1898                 return 39000; /* HT20 MCS4 */
1899         if (snr < 23)
1900                 return 52000; /* HT20 MCS5 */
1901         if (snr < 24)
1902                 return 58500; /* HT20 MCS6 */
1903         return 65000; /* HT20 MCS7 */
1904 }
1905
1906
1907 static unsigned int max_ht40_rate(int snr)
1908 {
1909         if (snr < 3)
1910                 return 13500; /* HT40 MCS0 */
1911         if (snr < 6)
1912                 return 27000; /* HT40 MCS1 */
1913         if (snr < 10)
1914                 return 40500; /* HT40 MCS2 */
1915         if (snr < 15)
1916                 return 54000; /* HT40 MCS3 */
1917         if (snr < 17)
1918                 return 81000; /* HT40 MCS4 */
1919         if (snr < 22)
1920                 return 108000; /* HT40 MCS5 */
1921         if (snr < 24)
1922                 return 121500; /* HT40 MCS6 */
1923         return 135000; /* HT40 MCS7 */
1924 }
1925
1926
1927 static unsigned int max_vht80_rate(int snr)
1928 {
1929         if (snr < 1)
1930                 return 0;
1931         if (snr < 2)
1932                 return 29300; /* VHT80 MCS0 */
1933         if (snr < 5)
1934                 return 58500; /* VHT80 MCS1 */
1935         if (snr < 9)
1936                 return 87800; /* VHT80 MCS2 */
1937         if (snr < 11)
1938                 return 117000; /* VHT80 MCS3 */
1939         if (snr < 15)
1940                 return 175500; /* VHT80 MCS4 */
1941         if (snr < 16)
1942                 return 234000; /* VHT80 MCS5 */
1943         if (snr < 18)
1944                 return 263300; /* VHT80 MCS6 */
1945         if (snr < 20)
1946                 return 292500; /* VHT80 MCS7 */
1947         if (snr < 22)
1948                 return 351000; /* VHT80 MCS8 */
1949         return 390000; /* VHT80 MCS9 */
1950 }
1951
1952
1953 static void scan_est_throughput(struct wpa_supplicant *wpa_s,
1954                                 struct wpa_scan_res *res)
1955 {
1956         enum local_hw_capab capab = wpa_s->hw_capab;
1957         int rate; /* max legacy rate in 500 kb/s units */
1958         const u8 *ie;
1959         unsigned int est, tmp;
1960         int snr = res->snr;
1961
1962         if (res->est_throughput)
1963                 return;
1964
1965         /* Get maximum legacy rate */
1966         rate = wpa_scan_get_max_rate(res);
1967
1968         /* Limit based on estimated SNR */
1969         if (rate > 1 * 2 && snr < 1)
1970                 rate = 1 * 2;
1971         else if (rate > 2 * 2 && snr < 4)
1972                 rate = 2 * 2;
1973         else if (rate > 6 * 2 && snr < 5)
1974                 rate = 6 * 2;
1975         else if (rate > 9 * 2 && snr < 6)
1976                 rate = 9 * 2;
1977         else if (rate > 12 * 2 && snr < 7)
1978                 rate = 12 * 2;
1979         else if (rate > 18 * 2 && snr < 10)
1980                 rate = 18 * 2;
1981         else if (rate > 24 * 2 && snr < 11)
1982                 rate = 24 * 2;
1983         else if (rate > 36 * 2 && snr < 15)
1984                 rate = 36 * 2;
1985         else if (rate > 48 * 2 && snr < 19)
1986                 rate = 48 * 2;
1987         else if (rate > 54 * 2 && snr < 21)
1988                 rate = 54 * 2;
1989         est = rate * 500;
1990
1991         if (capab == CAPAB_HT || capab == CAPAB_HT40 || capab == CAPAB_VHT) {
1992                 ie = wpa_scan_get_ie(res, WLAN_EID_HT_CAP);
1993                 if (ie) {
1994                         tmp = max_ht20_rate(snr);
1995                         if (tmp > est)
1996                                 est = tmp;
1997                 }
1998         }
1999
2000         if (capab == CAPAB_HT40 || capab == CAPAB_VHT) {
2001                 ie = wpa_scan_get_ie(res, WLAN_EID_HT_OPERATION);
2002                 if (ie && ie[1] >= 2 &&
2003                     (ie[3] & HT_INFO_HT_PARAM_SECONDARY_CHNL_OFF_MASK)) {
2004                         tmp = max_ht40_rate(snr);
2005                         if (tmp > est)
2006                                 est = tmp;
2007                 }
2008         }
2009
2010         if (capab == CAPAB_VHT) {
2011                 /* Use +1 to assume VHT is always faster than HT */
2012                 ie = wpa_scan_get_ie(res, WLAN_EID_VHT_CAP);
2013                 if (ie) {
2014                         tmp = max_ht20_rate(snr) + 1;
2015                         if (tmp > est)
2016                                 est = tmp;
2017
2018                         ie = wpa_scan_get_ie(res, WLAN_EID_HT_OPERATION);
2019                         if (ie && ie[1] >= 2 &&
2020                             (ie[3] &
2021                              HT_INFO_HT_PARAM_SECONDARY_CHNL_OFF_MASK)) {
2022                                 tmp = max_ht40_rate(snr) + 1;
2023                                 if (tmp > est)
2024                                         est = tmp;
2025                         }
2026
2027                         ie = wpa_scan_get_ie(res, WLAN_EID_VHT_OPERATION);
2028                         if (ie && ie[1] >= 1 &&
2029                             (ie[2] & VHT_OPMODE_CHANNEL_WIDTH_MASK)) {
2030                                 tmp = max_vht80_rate(snr) + 1;
2031                                 if (tmp > est)
2032                                         est = tmp;
2033                         }
2034                 }
2035         }
2036
2037         /* TODO: channel utilization and AP load (e.g., from AP Beacon) */
2038
2039         res->est_throughput = est;
2040 }
2041
2042
2043 /**
2044  * wpa_supplicant_get_scan_results - Get scan results
2045  * @wpa_s: Pointer to wpa_supplicant data
2046  * @info: Information about what was scanned or %NULL if not available
2047  * @new_scan: Whether a new scan was performed
2048  * Returns: Scan results, %NULL on failure
2049  *
2050  * This function request the current scan results from the driver and updates
2051  * the local BSS list wpa_s->bss. The caller is responsible for freeing the
2052  * results with wpa_scan_results_free().
2053  */
2054 struct wpa_scan_results *
2055 wpa_supplicant_get_scan_results(struct wpa_supplicant *wpa_s,
2056                                 struct scan_info *info, int new_scan)
2057 {
2058         struct wpa_scan_results *scan_res;
2059         size_t i;
2060         int (*compar)(const void *, const void *) = wpa_scan_result_compar;
2061
2062         scan_res = wpa_drv_get_scan_results2(wpa_s);
2063         if (scan_res == NULL) {
2064                 wpa_dbg(wpa_s, MSG_DEBUG, "Failed to get scan results");
2065                 return NULL;
2066         }
2067         if (scan_res->fetch_time.sec == 0) {
2068                 /*
2069                  * Make sure we have a valid timestamp if the driver wrapper
2070                  * does not set this.
2071                  */
2072                 os_get_reltime(&scan_res->fetch_time);
2073         }
2074         filter_scan_res(wpa_s, scan_res);
2075
2076         for (i = 0; i < scan_res->num; i++) {
2077                 struct wpa_scan_res *scan_res_item = scan_res->res[i];
2078
2079                 scan_snr(scan_res_item);
2080                 scan_est_throughput(wpa_s, scan_res_item);
2081         }
2082
2083 #ifdef CONFIG_WPS
2084         if (wpas_wps_searching(wpa_s)) {
2085                 wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Order scan results with WPS "
2086                         "provisioning rules");
2087                 compar = wpa_scan_result_wps_compar;
2088         }
2089 #endif /* CONFIG_WPS */
2090
2091         qsort(scan_res->res, scan_res->num, sizeof(struct wpa_scan_res *),
2092               compar);
2093         dump_scan_res(scan_res);
2094
2095         wpa_bss_update_start(wpa_s);
2096         for (i = 0; i < scan_res->num; i++)
2097                 wpa_bss_update_scan_res(wpa_s, scan_res->res[i],
2098                                         &scan_res->fetch_time);
2099         wpa_bss_update_end(wpa_s, info, new_scan);
2100
2101         return scan_res;
2102 }
2103
2104
2105 /**
2106  * wpa_supplicant_update_scan_results - Update scan results from the driver
2107  * @wpa_s: Pointer to wpa_supplicant data
2108  * Returns: 0 on success, -1 on failure
2109  *
2110  * This function updates the BSS table within wpa_supplicant based on the
2111  * currently available scan results from the driver without requesting a new
2112  * scan. This is used in cases where the driver indicates an association
2113  * (including roaming within ESS) and wpa_supplicant does not yet have the
2114  * needed information to complete the connection (e.g., to perform validation
2115  * steps in 4-way handshake).
2116  */
2117 int wpa_supplicant_update_scan_results(struct wpa_supplicant *wpa_s)
2118 {
2119         struct wpa_scan_results *scan_res;
2120         scan_res = wpa_supplicant_get_scan_results(wpa_s, NULL, 0);
2121         if (scan_res == NULL)
2122                 return -1;
2123         wpa_scan_results_free(scan_res);
2124
2125         return 0;
2126 }
2127
2128
2129 /**
2130  * scan_only_handler - Reports scan results
2131  */
2132 void scan_only_handler(struct wpa_supplicant *wpa_s,
2133                        struct wpa_scan_results *scan_res)
2134 {
2135         wpa_dbg(wpa_s, MSG_DEBUG, "Scan-only results received");
2136         if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
2137             wpa_s->manual_scan_use_id && wpa_s->own_scan_running) {
2138                 wpa_msg_ctrl(wpa_s, MSG_INFO, WPA_EVENT_SCAN_RESULTS "id=%u",
2139                              wpa_s->manual_scan_id);
2140                 wpa_s->manual_scan_use_id = 0;
2141         } else {
2142                 wpa_msg_ctrl(wpa_s, MSG_INFO, WPA_EVENT_SCAN_RESULTS);
2143         }
2144         wpas_notify_scan_results(wpa_s);
2145         wpas_notify_scan_done(wpa_s, 1);
2146         if (wpa_s->scan_work) {
2147                 struct wpa_radio_work *work = wpa_s->scan_work;
2148                 wpa_s->scan_work = NULL;
2149                 radio_work_done(work);
2150         }
2151 }
2152
2153
2154 int wpas_scan_scheduled(struct wpa_supplicant *wpa_s)
2155 {
2156         return eloop_is_timeout_registered(wpa_supplicant_scan, wpa_s, NULL);
2157 }
2158
2159
2160 struct wpa_driver_scan_params *
2161 wpa_scan_clone_params(const struct wpa_driver_scan_params *src)
2162 {
2163         struct wpa_driver_scan_params *params;
2164         size_t i;
2165         u8 *n;
2166
2167         params = os_zalloc(sizeof(*params));
2168         if (params == NULL)
2169                 return NULL;
2170
2171         for (i = 0; i < src->num_ssids; i++) {
2172                 if (src->ssids[i].ssid) {
2173                         n = os_malloc(src->ssids[i].ssid_len);
2174                         if (n == NULL)
2175                                 goto failed;
2176                         os_memcpy(n, src->ssids[i].ssid,
2177                                   src->ssids[i].ssid_len);
2178                         params->ssids[i].ssid = n;
2179                         params->ssids[i].ssid_len = src->ssids[i].ssid_len;
2180                 }
2181         }
2182         params->num_ssids = src->num_ssids;
2183
2184         if (src->extra_ies) {
2185                 n = os_malloc(src->extra_ies_len);
2186                 if (n == NULL)
2187                         goto failed;
2188                 os_memcpy(n, src->extra_ies, src->extra_ies_len);
2189                 params->extra_ies = n;
2190                 params->extra_ies_len = src->extra_ies_len;
2191         }
2192
2193         if (src->freqs) {
2194                 int len = int_array_len(src->freqs);
2195                 params->freqs = os_malloc((len + 1) * sizeof(int));
2196                 if (params->freqs == NULL)
2197                         goto failed;
2198                 os_memcpy(params->freqs, src->freqs, (len + 1) * sizeof(int));
2199         }
2200
2201         if (src->filter_ssids) {
2202                 params->filter_ssids = os_malloc(sizeof(*params->filter_ssids) *
2203                                                  src->num_filter_ssids);
2204                 if (params->filter_ssids == NULL)
2205                         goto failed;
2206                 os_memcpy(params->filter_ssids, src->filter_ssids,
2207                           sizeof(*params->filter_ssids) *
2208                           src->num_filter_ssids);
2209                 params->num_filter_ssids = src->num_filter_ssids;
2210         }
2211
2212         params->filter_rssi = src->filter_rssi;
2213         params->p2p_probe = src->p2p_probe;
2214         params->only_new_results = src->only_new_results;
2215         params->low_priority = src->low_priority;
2216
2217         if (src->mac_addr_rand) {
2218                 params->mac_addr_rand = src->mac_addr_rand;
2219
2220                 if (src->mac_addr && src->mac_addr_mask) {
2221                         u8 *mac_addr;
2222
2223                         mac_addr = os_malloc(2 * ETH_ALEN);
2224                         if (!mac_addr)
2225                                 goto failed;
2226
2227                         os_memcpy(mac_addr, src->mac_addr, ETH_ALEN);
2228                         os_memcpy(mac_addr + ETH_ALEN, src->mac_addr_mask,
2229                                   ETH_ALEN);
2230                         params->mac_addr = mac_addr;
2231                         params->mac_addr_mask = mac_addr + ETH_ALEN;
2232                 }
2233         }
2234         return params;
2235
2236 failed:
2237         wpa_scan_free_params(params);
2238         return NULL;
2239 }
2240
2241
2242 void wpa_scan_free_params(struct wpa_driver_scan_params *params)
2243 {
2244         size_t i;
2245
2246         if (params == NULL)
2247                 return;
2248
2249         for (i = 0; i < params->num_ssids; i++)
2250                 os_free((u8 *) params->ssids[i].ssid);
2251         os_free((u8 *) params->extra_ies);
2252         os_free(params->freqs);
2253         os_free(params->filter_ssids);
2254
2255         /*
2256          * Note: params->mac_addr_mask points to same memory allocation and
2257          * must not be freed separately.
2258          */
2259         os_free((u8 *) params->mac_addr);
2260
2261         os_free(params);
2262 }
2263
2264
2265 int wpas_start_pno(struct wpa_supplicant *wpa_s)
2266 {
2267         int ret, interval, prio;
2268         size_t i, num_ssid, num_match_ssid;
2269         struct wpa_ssid *ssid;
2270         struct wpa_driver_scan_params params;
2271
2272         if (!wpa_s->sched_scan_supported)
2273                 return -1;
2274
2275         if (wpa_s->pno || wpa_s->pno_sched_pending)
2276                 return 0;
2277
2278         if ((wpa_s->wpa_state > WPA_SCANNING) &&
2279             (wpa_s->wpa_state <= WPA_COMPLETED)) {
2280                 wpa_printf(MSG_ERROR, "PNO: In assoc process");
2281                 return -EAGAIN;
2282         }
2283
2284         if (wpa_s->wpa_state == WPA_SCANNING) {
2285                 wpa_supplicant_cancel_scan(wpa_s);
2286                 if (wpa_s->sched_scanning) {
2287                         wpa_printf(MSG_DEBUG, "Schedule PNO on completion of "
2288                                    "ongoing sched scan");
2289                         wpa_supplicant_cancel_sched_scan(wpa_s);
2290                         wpa_s->pno_sched_pending = 1;
2291                         return 0;
2292                 }
2293         }
2294
2295         os_memset(&params, 0, sizeof(params));
2296
2297         num_ssid = num_match_ssid = 0;
2298         ssid = wpa_s->conf->ssid;
2299         while (ssid) {
2300                 if (!wpas_network_disabled(wpa_s, ssid)) {
2301                         num_match_ssid++;
2302                         if (ssid->scan_ssid)
2303                                 num_ssid++;
2304                 }
2305                 ssid = ssid->next;
2306         }
2307
2308         if (num_match_ssid == 0) {
2309                 wpa_printf(MSG_DEBUG, "PNO: No configured SSIDs");
2310                 return -1;
2311         }
2312
2313         if (num_match_ssid > num_ssid) {
2314                 params.num_ssids++; /* wildcard */
2315                 num_ssid++;
2316         }
2317
2318         if (num_ssid > WPAS_MAX_SCAN_SSIDS) {
2319                 wpa_printf(MSG_DEBUG, "PNO: Use only the first %u SSIDs from "
2320                            "%u", WPAS_MAX_SCAN_SSIDS, (unsigned int) num_ssid);
2321                 num_ssid = WPAS_MAX_SCAN_SSIDS;
2322         }
2323
2324         if (num_match_ssid > wpa_s->max_match_sets) {
2325                 num_match_ssid = wpa_s->max_match_sets;
2326                 wpa_dbg(wpa_s, MSG_DEBUG, "PNO: Too many SSIDs to match");
2327         }
2328         params.filter_ssids = os_calloc(num_match_ssid,
2329                                         sizeof(struct wpa_driver_scan_filter));
2330         if (params.filter_ssids == NULL)
2331                 return -1;
2332
2333         i = 0;
2334         prio = 0;
2335         ssid = wpa_s->conf->pssid[prio];
2336         while (ssid) {
2337                 if (!wpas_network_disabled(wpa_s, ssid)) {
2338                         if (ssid->scan_ssid && params.num_ssids < num_ssid) {
2339                                 params.ssids[params.num_ssids].ssid =
2340                                         ssid->ssid;
2341                                 params.ssids[params.num_ssids].ssid_len =
2342                                          ssid->ssid_len;
2343                                 params.num_ssids++;
2344                         }
2345                         os_memcpy(params.filter_ssids[i].ssid, ssid->ssid,
2346                                   ssid->ssid_len);
2347                         params.filter_ssids[i].ssid_len = ssid->ssid_len;
2348                         params.num_filter_ssids++;
2349                         i++;
2350                         if (i == num_match_ssid)
2351                                 break;
2352                 }
2353                 if (ssid->pnext)
2354                         ssid = ssid->pnext;
2355                 else if (prio + 1 == wpa_s->conf->num_prio)
2356                         break;
2357                 else
2358                         ssid = wpa_s->conf->pssid[++prio];
2359         }
2360
2361         if (wpa_s->conf->filter_rssi)
2362                 params.filter_rssi = wpa_s->conf->filter_rssi;
2363
2364         interval = wpa_s->conf->sched_scan_interval ?
2365                 wpa_s->conf->sched_scan_interval : 10;
2366
2367         if (params.freqs == NULL && wpa_s->manual_sched_scan_freqs) {
2368                 wpa_dbg(wpa_s, MSG_DEBUG, "Limit sched scan to specified channels");
2369                 params.freqs = wpa_s->manual_sched_scan_freqs;
2370         }
2371
2372         if (wpa_s->mac_addr_rand_enable & MAC_ADDR_RAND_PNO) {
2373                 params.mac_addr_rand = 1;
2374                 if (wpa_s->mac_addr_pno) {
2375                         params.mac_addr = wpa_s->mac_addr_pno;
2376                         params.mac_addr_mask = wpa_s->mac_addr_pno + ETH_ALEN;
2377                 }
2378         }
2379
2380         ret = wpa_supplicant_start_sched_scan(wpa_s, &params, interval);
2381         os_free(params.filter_ssids);
2382         if (ret == 0)
2383                 wpa_s->pno = 1;
2384         else
2385                 wpa_msg(wpa_s, MSG_ERROR, "Failed to schedule PNO");
2386         return ret;
2387 }
2388
2389
2390 int wpas_stop_pno(struct wpa_supplicant *wpa_s)
2391 {
2392         int ret = 0;
2393
2394         if (!wpa_s->pno)
2395                 return 0;
2396
2397         ret = wpa_supplicant_stop_sched_scan(wpa_s);
2398
2399         wpa_s->pno = 0;
2400         wpa_s->pno_sched_pending = 0;
2401
2402         if (wpa_s->wpa_state == WPA_SCANNING)
2403                 wpa_supplicant_req_scan(wpa_s, 0, 0);
2404
2405         return ret;
2406 }
2407
2408
2409 void wpas_mac_addr_rand_scan_clear(struct wpa_supplicant *wpa_s,
2410                                     unsigned int type)
2411 {
2412         type &= MAC_ADDR_RAND_ALL;
2413         wpa_s->mac_addr_rand_enable &= ~type;
2414
2415         if (type & MAC_ADDR_RAND_SCAN) {
2416                 os_free(wpa_s->mac_addr_scan);
2417                 wpa_s->mac_addr_scan = NULL;
2418         }
2419
2420         if (type & MAC_ADDR_RAND_SCHED_SCAN) {
2421                 os_free(wpa_s->mac_addr_sched_scan);
2422                 wpa_s->mac_addr_sched_scan = NULL;
2423         }
2424
2425         if (type & MAC_ADDR_RAND_PNO) {
2426                 os_free(wpa_s->mac_addr_pno);
2427                 wpa_s->mac_addr_pno = NULL;
2428         }
2429 }
2430
2431
2432 int wpas_mac_addr_rand_scan_set(struct wpa_supplicant *wpa_s,
2433                                 unsigned int type, const u8 *addr,
2434                                 const u8 *mask)
2435 {
2436         u8 *tmp = NULL;
2437
2438         wpas_mac_addr_rand_scan_clear(wpa_s, type);
2439
2440         if (addr) {
2441                 tmp = os_malloc(2 * ETH_ALEN);
2442                 if (!tmp)
2443                         return -1;
2444                 os_memcpy(tmp, addr, ETH_ALEN);
2445                 os_memcpy(tmp + ETH_ALEN, mask, ETH_ALEN);
2446         }
2447
2448         if (type == MAC_ADDR_RAND_SCAN) {
2449                 wpa_s->mac_addr_scan = tmp;
2450         } else if (type == MAC_ADDR_RAND_SCHED_SCAN) {
2451                 wpa_s->mac_addr_sched_scan = tmp;
2452         } else if (type == MAC_ADDR_RAND_PNO) {
2453                 wpa_s->mac_addr_pno = tmp;
2454         } else {
2455                 wpa_printf(MSG_INFO,
2456                            "scan: Invalid MAC randomization type=0x%x",
2457                            type);
2458                 os_free(tmp);
2459                 return -1;
2460         }
2461
2462         wpa_s->mac_addr_rand_enable |= type;
2463         return 0;
2464 }