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         if (wpa_s->conf->interworking == 0)
 422                 return;
 423
 424         wpabuf_put_u8(buf, WLAN_EID_EXT_CAPAB);
 425         wpabuf_put_u8(buf, 6);
 426         wpabuf_put_u8(buf, 0x00);
 427         wpabuf_put_u8(buf, 0x00);
 428         wpabuf_put_u8(buf, 0x00);
 429         wpabuf_put_u8(buf, 0x80); /* Bit 31 - Interworking */
 430         wpabuf_put_u8(buf, 0x00);
 431 #ifdef CONFIG_HS20
 432         wpabuf_put_u8(buf, 0x40); /* Bit 46 - WNM-Notification */
 433 #else /* CONFIG_HS20 */
 434         wpabuf_put_u8(buf, 0x00);
 435 #endif /* CONFIG_HS20 */
 436
 437         wpabuf_put_u8(buf, WLAN_EID_INTERWORKING);
 438         wpabuf_put_u8(buf, is_zero_ether_addr(wpa_s->conf->hessid) ? 1 :
 439                       1 + ETH_ALEN);
 440         wpabuf_put_u8(buf, wpa_s->conf->access_network_type);
 441         /* No Venue Info */
 442         if (!is_zero_ether_addr(wpa_s->conf->hessid))
 443                 wpabuf_put_data(buf, wpa_s->conf->hessid, ETH_ALEN);
 444 }
 445 #endif /* CONFIG_INTERWORKING */
 446
 447
 448 static struct wpabuf * wpa_supplicant_extra_ies(struct wpa_supplicant *wpa_s)
 449 {
 450         struct wpabuf *extra_ie = NULL;
 451 #ifdef CONFIG_WPS
 452         int wps = 0;
 453         enum wps_request_type req_type = WPS_REQ_ENROLLEE_INFO;
 454 #endif /* CONFIG_WPS */
 455
 456 #ifdef CONFIG_INTERWORKING
 457         if (wpa_s->conf->interworking &&
 458             wpabuf_resize(&extra_ie, 100) == 0)
 459                 wpas_add_interworking_elements(wpa_s, extra_ie);
 460 #endif /* CONFIG_INTERWORKING */
 461
 462 #ifdef CONFIG_WPS
 463         wps = wpas_wps_in_use(wpa_s, &req_type);
 464
 465         if (wps) {
 466                 struct wpabuf *wps_ie;
 467                 wps_ie = wps_build_probe_req_ie(wps == 2 ? DEV_PW_PUSHBUTTON :
 468                                                 DEV_PW_DEFAULT,
 469                                                 &wpa_s->wps->dev,
 470                                                 wpa_s->wps->uuid, req_type,
 471                                                 0, NULL);
 472                 if (wps_ie) {
 473                         if (wpabuf_resize(&extra_ie, wpabuf_len(wps_ie)) == 0)
 474                                 wpabuf_put_buf(extra_ie, wps_ie);
 475                         wpabuf_free(wps_ie);
 476                 }
 477         }
 478
 479 #ifdef CONFIG_P2P
 480         if (wps) {
 481                 size_t ielen = p2p_scan_ie_buf_len(wpa_s->global->p2p);
 482                 if (wpabuf_resize(&extra_ie, ielen) == 0)
 483                         wpas_p2p_scan_ie(wpa_s, extra_ie);
 484         }
 485 #endif /* CONFIG_P2P */
 486
 487         wpa_supplicant_mesh_add_scan_ie(wpa_s, &extra_ie);
 488
 489 #endif /* CONFIG_WPS */
 490
 491 #ifdef CONFIG_HS20
 492         if (wpa_s->conf->hs20 && wpabuf_resize(&extra_ie, 7) == 0)
 493                 wpas_hs20_add_indication(extra_ie, -1);
 494 #endif /* CONFIG_HS20 */
 495
 496         return extra_ie;
 497 }
 498
 499
 500 #ifdef CONFIG_P2P
 501
 502 /*
 503  * Check whether there are any enabled networks or credentials that could be
 504  * used for a non-P2P connection.
 505  */
 506 static int non_p2p_network_enabled(struct wpa_supplicant *wpa_s)
 507 {
 508         struct wpa_ssid *ssid;
 509
 510         for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
 511                 if (wpas_network_disabled(wpa_s, ssid))
 512                         continue;
 513                 if (!ssid->p2p_group)
 514                         return 1;
 515         }
 516
 517         if (wpa_s->conf->cred && wpa_s->conf->interworking &&
 518             wpa_s->conf->auto_interworking)
 519                 return 1;
 520
 521         return 0;
 522 }
 523
 524 #endif /* CONFIG_P2P */
 525
 526
 527 static struct hostapd_hw_modes * get_mode(struct hostapd_hw_modes *modes,
 528                                           u16 num_modes,
 529                                           enum hostapd_hw_mode mode)
 530 {
 531         u16 i;
 532
 533         for (i = 0; i < num_modes; i++) {
 534                 if (modes[i].mode == mode)
 535                         return &modes[i];
 536         }
 537
 538         return NULL;
 539 }
 540
 541
 542 static void wpa_setband_scan_freqs_list(struct wpa_supplicant *wpa_s,
 543                                         enum hostapd_hw_mode band,
 544                                         struct wpa_driver_scan_params *params)
 545 {
 546         /* Include only supported channels for the specified band */
 547         struct hostapd_hw_modes *mode;
 548         int count, i;
 549
 550         mode = get_mode(wpa_s->hw.modes, wpa_s->hw.num_modes, band);
 551         if (mode == NULL) {
 552                 /* No channels supported in this band - use empty list */
 553                 params->freqs = os_zalloc(sizeof(int));
 554                 return;
 555         }
 556
 557         params->freqs = os_calloc(mode->num_channels + 1, sizeof(int));
 558         if (params->freqs == NULL)
 559                 return;
 560         for (count = 0, i = 0; i < mode->num_channels; i++) {
 561                 if (mode->channels[i].flag & HOSTAPD_CHAN_DISABLED)
 562                         continue;
 563                 params->freqs[count++] = mode->channels[i].freq;
 564         }
 565 }
 566
 567
 568 static void wpa_setband_scan_freqs(struct wpa_supplicant *wpa_s,
 569                                    struct wpa_driver_scan_params *params)
 570 {
 571         if (wpa_s->hw.modes == NULL)
 572                 return; /* unknown what channels the driver supports */
 573         if (params->freqs)
 574                 return; /* already using a limited channel set */
 575         if (wpa_s->setband == WPA_SETBAND_5G)
 576                 wpa_setband_scan_freqs_list(wpa_s, HOSTAPD_MODE_IEEE80211A,
 577                                             params);
 578         else if (wpa_s->setband == WPA_SETBAND_2G)
 579                 wpa_setband_scan_freqs_list(wpa_s, HOSTAPD_MODE_IEEE80211G,
 580                                             params);
 581 }
 582
 583
 584 static void wpa_set_scan_ssids(struct wpa_supplicant *wpa_s,
 585                                struct wpa_driver_scan_params *params,
 586                                size_t max_ssids)
 587 {
 588         unsigned int i;
 589         struct wpa_ssid *ssid;
 590
 591         for (i = 0; i < wpa_s->scan_id_count; i++) {
 592                 unsigned int j;
 593
 594                 ssid = wpa_config_get_network(wpa_s->conf, wpa_s->scan_id[i]);
 595                 if (!ssid || !ssid->scan_ssid)
 596                         continue;
 597
 598                 for (j = 0; j < params->num_ssids; j++) {
 599                         if (params->ssids[j].ssid_len == ssid->ssid_len &&
 600                             params->ssids[j].ssid &&
 601                             os_memcmp(params->ssids[j].ssid, ssid->ssid,
 602                                       ssid->ssid_len) == 0)
 603                                 break;
 604                 }
 605                 if (j < params->num_ssids)
 606                         continue; /* already in the list */
 607
 608                 if (params->num_ssids + 1 > max_ssids) {
 609                         wpa_printf(MSG_DEBUG,
 610                                    "Over max scan SSIDs for manual request");
 611                         break;
 612                 }
 613
 614                 wpa_printf(MSG_DEBUG, "Scan SSID (manual request): %s",
 615                            wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
 616                 params->ssids[params->num_ssids].ssid = ssid->ssid;
 617                 params->ssids[params->num_ssids].ssid_len = ssid->ssid_len;
 618                 params->num_ssids++;
 619         }
 620
 621         wpa_s->scan_id_count = 0;
 622 }
 623
 624
 625 static void wpa_supplicant_scan(void *eloop_ctx, void *timeout_ctx)
 626 {
 627         struct wpa_supplicant *wpa_s = eloop_ctx;
 628         struct wpa_ssid *ssid;
 629         int ret, p2p_in_prog;
 630         struct wpabuf *extra_ie = NULL;
 631         struct wpa_driver_scan_params params;
 632         struct wpa_driver_scan_params *scan_params;
 633         size_t max_ssids;
 634         int connect_without_scan = 0;
 635
 636         if (wpa_s->pno || wpa_s->pno_sched_pending) {
 637                 wpa_dbg(wpa_s, MSG_DEBUG, "Skip scan - PNO is in progress");
 638                 return;
 639         }
 640
 641         if (wpa_s->wpa_state == WPA_INTERFACE_DISABLED) {
 642                 wpa_dbg(wpa_s, MSG_DEBUG, "Skip scan - interface disabled");
 643                 return;
 644         }
 645
 646         if (wpa_s->disconnected && wpa_s->scan_req == NORMAL_SCAN_REQ) {
 647                 wpa_dbg(wpa_s, MSG_DEBUG, "Disconnected - do not scan");
 648                 wpa_supplicant_set_state(wpa_s, WPA_DISCONNECTED);
 649                 return;
 650         }
 651
 652         if (wpa_s->scanning) {
 653                 /*
 654                  * If we are already in scanning state, we shall reschedule the
 655                  * the incoming scan request.
 656                  */
 657                 wpa_dbg(wpa_s, MSG_DEBUG, "Already scanning - Reschedule the incoming scan req");
 658                 wpa_supplicant_req_scan(wpa_s, 1, 0);
 659                 return;
 660         }
 661
 662         if (!wpa_supplicant_enabled_networks(wpa_s) &&
 663             wpa_s->scan_req == NORMAL_SCAN_REQ) {
 664                 wpa_dbg(wpa_s, MSG_DEBUG, "No enabled networks - do not scan");
 665                 wpa_supplicant_set_state(wpa_s, WPA_INACTIVE);
 666                 return;
 667         }
 668
 669         if (wpa_s->conf->ap_scan != 0 &&
 670             (wpa_s->drv_flags & WPA_DRIVER_FLAGS_WIRED)) {
 671                 wpa_dbg(wpa_s, MSG_DEBUG, "Using wired authentication - "
 672                         "overriding ap_scan configuration");
 673                 wpa_s->conf->ap_scan = 0;
 674                 wpas_notify_ap_scan_changed(wpa_s);
 675         }
 676
 677         if (wpa_s->conf->ap_scan == 0) {
 678                 wpa_supplicant_gen_assoc_event(wpa_s);
 679                 return;
 680         }
 681
 682         ssid = NULL;
 683         if (wpa_s->scan_req != MANUAL_SCAN_REQ &&
 684             wpa_s->connect_without_scan) {
 685                 connect_without_scan = 1;
 686                 for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
 687                         if (ssid == wpa_s->connect_without_scan)
 688                                 break;
 689                 }
 690         }
 691
 692         p2p_in_prog = wpas_p2p_in_progress(wpa_s);
 693         if (p2p_in_prog && p2p_in_prog != 2 &&
 694             (!ssid ||
 695              (ssid->mode != WPAS_MODE_AP && ssid->mode != WPAS_MODE_P2P_GO))) {
 696                 wpa_dbg(wpa_s, MSG_DEBUG, "Delay station mode scan while P2P operation is in progress");
 697                 wpa_supplicant_req_scan(wpa_s, 5, 0);
 698                 return;
 699         }
 700
 701         if (wpa_s->conf->ap_scan == 2)
 702                 max_ssids = 1;
 703         else {
 704                 max_ssids = wpa_s->max_scan_ssids;
 705                 if (max_ssids > WPAS_MAX_SCAN_SSIDS)
 706                         max_ssids = WPAS_MAX_SCAN_SSIDS;
 707         }
 708
 709         wpa_s->last_scan_req = wpa_s->scan_req;
 710         wpa_s->scan_req = NORMAL_SCAN_REQ;
 711
 712         if (connect_without_scan) {
 713                 wpa_s->connect_without_scan = NULL;
 714                 if (ssid) {
 715                         wpa_printf(MSG_DEBUG, "Start a pre-selected network "
 716                                    "without scan step");
 717                         wpa_supplicant_associate(wpa_s, NULL, ssid);
 718                         return;
 719                 }
 720         }
 721
 722         os_memset(&params, 0, sizeof(params));
 723
 724         wpa_s->scan_prev_wpa_state = wpa_s->wpa_state;
 725         if (wpa_s->wpa_state == WPA_DISCONNECTED ||
 726             wpa_s->wpa_state == WPA_INACTIVE)
 727                 wpa_supplicant_set_state(wpa_s, WPA_SCANNING);
 728
 729         /*
 730          * If autoscan has set its own scanning parameters
 731          */
 732         if (wpa_s->autoscan_params != NULL) {
 733                 scan_params = wpa_s->autoscan_params;
 734                 goto scan;
 735         }
 736
 737 #ifdef CONFIG_P2P
 738         if ((wpa_s->p2p_in_provisioning || wpa_s->show_group_started) &&
 739             wpa_s->go_params && !wpa_s->conf->passive_scan) {
 740                 wpa_printf(MSG_DEBUG, "P2P: Use specific SSID for scan during P2P group formation (p2p_in_provisioning=%d show_group_started=%d)",
 741                            wpa_s->p2p_in_provisioning,
 742                            wpa_s->show_group_started);
 743                 params.ssids[0].ssid = wpa_s->go_params->ssid;
 744                 params.ssids[0].ssid_len = wpa_s->go_params->ssid_len;
 745                 params.num_ssids = 1;
 746                 goto ssid_list_set;
 747         }
 748
 749         if (wpa_s->p2p_in_invitation) {
 750                 if (wpa_s->current_ssid) {
 751                         wpa_printf(MSG_DEBUG, "P2P: Use specific SSID for scan during invitation");
 752                         params.ssids[0].ssid = wpa_s->current_ssid->ssid;
 753                         params.ssids[0].ssid_len =
 754                                 wpa_s->current_ssid->ssid_len;
 755                         params.num_ssids = 1;
 756                 } else {
 757                         wpa_printf(MSG_DEBUG, "P2P: No specific SSID known for scan during invitation");
 758                 }
 759                 goto ssid_list_set;
 760         }
 761 #endif /* CONFIG_P2P */
 762
 763         /* Find the starting point from which to continue scanning */
 764         ssid = wpa_s->conf->ssid;
 765         if (wpa_s->prev_scan_ssid != WILDCARD_SSID_SCAN) {
 766                 while (ssid) {
 767                         if (ssid == wpa_s->prev_scan_ssid) {
 768                                 ssid = ssid->next;
 769                                 break;
 770                         }
 771                         ssid = ssid->next;
 772                 }
 773         }
 774
 775         if (wpa_s->last_scan_req != MANUAL_SCAN_REQ &&
 776             wpa_s->conf->ap_scan == 2) {
 777                 wpa_s->connect_without_scan = NULL;
 778                 wpa_s->prev_scan_wildcard = 0;
 779                 wpa_supplicant_assoc_try(wpa_s, ssid);
 780                 return;
 781         } else if (wpa_s->conf->ap_scan == 2) {
 782                 /*
 783                  * User-initiated scan request in ap_scan == 2; scan with
 784                  * wildcard SSID.
 785                  */
 786                 ssid = NULL;
 787         } else if (wpa_s->reattach && wpa_s->current_ssid != NULL) {
 788                 /*
 789                  * Perform single-channel single-SSID scan for
 790                  * reassociate-to-same-BSS operation.
 791                  */
 792                 /* Setup SSID */
 793                 ssid = wpa_s->current_ssid;
 794                 wpa_hexdump_ascii(MSG_DEBUG, "Scan SSID",
 795                                   ssid->ssid, ssid->ssid_len);
 796                 params.ssids[0].ssid = ssid->ssid;
 797                 params.ssids[0].ssid_len = ssid->ssid_len;
 798                 params.num_ssids = 1;
 799
 800                 /*
 801                  * Allocate memory for frequency array, allocate one extra
 802                  * slot for the zero-terminator.
 803                  */
 804                 params.freqs = os_malloc(sizeof(int) * 2);
 805                 if (params.freqs == NULL) {
 806                         wpa_dbg(wpa_s, MSG_ERROR, "Memory allocation failed");
 807                         return;
 808                 }
 809                 params.freqs[0] = wpa_s->assoc_freq;
 810                 params.freqs[1] = 0;
 811
 812                 /*
 813                  * Reset the reattach flag so that we fall back to full scan if
 814                  * this scan fails.
 815                  */
 816                 wpa_s->reattach = 0;
 817         } else {
 818                 struct wpa_ssid *start = ssid, *tssid;
 819                 int freqs_set = 0;
 820                 if (ssid == NULL && max_ssids > 1)
 821                         ssid = wpa_s->conf->ssid;
 822                 while (ssid) {
 823                         if (!wpas_network_disabled(wpa_s, ssid) &&
 824                             ssid->scan_ssid) {
 825                                 wpa_hexdump_ascii(MSG_DEBUG, "Scan SSID",
 826                                                   ssid->ssid, ssid->ssid_len);
 827                                 params.ssids[params.num_ssids].ssid =
 828                                         ssid->ssid;
 829                                 params.ssids[params.num_ssids].ssid_len =
 830                                         ssid->ssid_len;
 831                                 params.num_ssids++;
 832                                 if (params.num_ssids + 1 >= max_ssids)
 833                                         break;
 834                         }
 835                         ssid = ssid->next;
 836                         if (ssid == start)
 837                                 break;
 838                         if (ssid == NULL && max_ssids > 1 &&
 839                             start != wpa_s->conf->ssid)
 840                                 ssid = wpa_s->conf->ssid;
 841                 }
 842
 843                 if (wpa_s->scan_id_count &&
 844                     wpa_s->last_scan_req == MANUAL_SCAN_REQ)
 845                         wpa_set_scan_ssids(wpa_s, &params, max_ssids);
 846
 847                 for (tssid = wpa_s->conf->ssid;
 848                      wpa_s->last_scan_req != MANUAL_SCAN_REQ && tssid;
 849                      tssid = tssid->next) {
 850                         if (wpas_network_disabled(wpa_s, tssid))
 851                                 continue;
 852                         if ((params.freqs || !freqs_set) && tssid->scan_freq) {
 853                                 int_array_concat(&params.freqs,
 854                                                  tssid->scan_freq);
 855                         } else {
 856                                 os_free(params.freqs);
 857                                 params.freqs = NULL;
 858                         }
 859                         freqs_set = 1;
 860                 }
 861                 int_array_sort_unique(params.freqs);
 862         }
 863
 864         if (ssid && max_ssids == 1) {
 865                 /*
 866                  * If the driver is limited to 1 SSID at a time interleave
 867                  * wildcard SSID scans with specific SSID scans to avoid
 868                  * waiting a long time for a wildcard scan.
 869                  */
 870                 if (!wpa_s->prev_scan_wildcard) {
 871                         params.ssids[0].ssid = NULL;
 872                         params.ssids[0].ssid_len = 0;
 873                         wpa_s->prev_scan_wildcard = 1;
 874                         wpa_dbg(wpa_s, MSG_DEBUG, "Starting AP scan for "
 875                                 "wildcard SSID (Interleave with specific)");
 876                 } else {
 877                         wpa_s->prev_scan_ssid = ssid;
 878                         wpa_s->prev_scan_wildcard = 0;
 879                         wpa_dbg(wpa_s, MSG_DEBUG,
 880                                 "Starting AP scan for specific SSID: %s",
 881                                 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
 882                 }
 883         } else if (ssid) {
 884                 /* max_ssids > 1 */
 885
 886                 wpa_s->prev_scan_ssid = ssid;
 887                 wpa_dbg(wpa_s, MSG_DEBUG, "Include wildcard SSID in "
 888                         "the scan request");
 889                 params.num_ssids++;
 890         } else if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
 891                    wpa_s->manual_scan_passive && params.num_ssids == 0) {
 892                 wpa_dbg(wpa_s, MSG_DEBUG, "Use passive scan based on manual request");
 893         } else if (wpa_s->conf->passive_scan) {
 894                 wpa_dbg(wpa_s, MSG_DEBUG,
 895                         "Use passive scan based on configuration");
 896         } else {
 897                 wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
 898                 params.num_ssids++;
 899                 wpa_dbg(wpa_s, MSG_DEBUG, "Starting AP scan for wildcard "
 900                         "SSID");
 901         }
 902 #ifdef CONFIG_P2P
 903 ssid_list_set:
 904 #endif /* CONFIG_P2P */
 905
 906         wpa_supplicant_optimize_freqs(wpa_s, &params);
 907         extra_ie = wpa_supplicant_extra_ies(wpa_s);
 908
 909         if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
 910             wpa_s->manual_scan_only_new) {
 911                 wpa_printf(MSG_DEBUG,
 912                            "Request driver to clear scan cache due to manual only_new=1 scan");
 913                 params.only_new_results = 1;
 914         }
 915
 916         if (wpa_s->last_scan_req == MANUAL_SCAN_REQ && params.freqs == NULL &&
 917             wpa_s->manual_scan_freqs) {
 918                 wpa_dbg(wpa_s, MSG_DEBUG, "Limit manual scan to specified channels");
 919                 params.freqs = wpa_s->manual_scan_freqs;
 920                 wpa_s->manual_scan_freqs = NULL;
 921         }
 922
 923         if (params.freqs == NULL && wpa_s->next_scan_freqs) {
 924                 wpa_dbg(wpa_s, MSG_DEBUG, "Optimize scan based on previously "
 925                         "generated frequency list");
 926                 params.freqs = wpa_s->next_scan_freqs;
 927         } else
 928                 os_free(wpa_s->next_scan_freqs);
 929         wpa_s->next_scan_freqs = NULL;
 930         wpa_setband_scan_freqs(wpa_s, &params);
 931
 932         /* See if user specified frequencies. If so, scan only those. */
 933         if (wpa_s->conf->freq_list && !params.freqs) {
 934                 wpa_dbg(wpa_s, MSG_DEBUG,
 935                         "Optimize scan based on conf->freq_list");
 936                 int_array_concat(&params.freqs, wpa_s->conf->freq_list);
 937         }
 938
 939         /* Use current associated channel? */
 940         if (wpa_s->conf->scan_cur_freq && !params.freqs) {
 941                 unsigned int num = wpa_s->num_multichan_concurrent;
 942
 943                 params.freqs = os_calloc(num + 1, sizeof(int));
 944                 if (params.freqs) {
 945                         num = get_shared_radio_freqs(wpa_s, params.freqs, num);
 946                         if (num > 0) {
 947                                 wpa_dbg(wpa_s, MSG_DEBUG, "Scan only the "
 948                                         "current operating channels since "
 949                                         "scan_cur_freq is enabled");
 950                         } else {
 951                                 os_free(params.freqs);
 952                                 params.freqs = NULL;
 953                         }
 954                 }
 955         }
 956
 957         params.filter_ssids = wpa_supplicant_build_filter_ssids(
 958                 wpa_s->conf, &params.num_filter_ssids);
 959         if (extra_ie) {
 960                 params.extra_ies = wpabuf_head(extra_ie);
 961                 params.extra_ies_len = wpabuf_len(extra_ie);
 962         }
 963
 964 #ifdef CONFIG_P2P
 965         if (wpa_s->p2p_in_provisioning || wpa_s->p2p_in_invitation ||
 966             (wpa_s->show_group_started && wpa_s->go_params)) {
 967                 /*
 968                  * The interface may not yet be in P2P mode, so we have to
 969                  * explicitly request P2P probe to disable CCK rates.
 970                  */
 971                 params.p2p_probe = 1;
 972         }
 973 #endif /* CONFIG_P2P */
 974
 975         if (wpa_s->mac_addr_rand_enable & MAC_ADDR_RAND_SCAN) {
 976                 params.mac_addr_rand = 1;
 977                 if (wpa_s->mac_addr_scan) {
 978                         params.mac_addr = wpa_s->mac_addr_scan;
 979                         params.mac_addr_mask = wpa_s->mac_addr_scan + ETH_ALEN;
 980                 }
 981         }
 982
 983         scan_params = &params;
 984
 985 scan:
 986 #ifdef CONFIG_P2P
 987         /*
 988          * If the driver does not support multi-channel concurrency and a
 989          * virtual interface that shares the same radio with the wpa_s interface
 990          * is operating there may not be need to scan other channels apart from
 991          * the current operating channel on the other virtual interface. Filter
 992          * out other channels in case we are trying to find a connection for a
 993          * station interface when we are not configured to prefer station
 994          * connection and a concurrent operation is already in process.
 995          */
 996         if (wpa_s->scan_for_connection &&
 997             wpa_s->last_scan_req == NORMAL_SCAN_REQ &&
 998             !scan_params->freqs && !params.freqs &&
 999             wpas_is_p2p_prioritized(wpa_s) &&
1000             wpa_s->p2p_group_interface == NOT_P2P_GROUP_INTERFACE &&
1001             non_p2p_network_enabled(wpa_s)) {
1002                 unsigned int num = wpa_s->num_multichan_concurrent;
1003
1004                 params.freqs = os_calloc(num + 1, sizeof(int));
1005                 if (params.freqs) {
1006                         num = get_shared_radio_freqs(wpa_s, params.freqs, num);
1007                         if (num > 0 && num == wpa_s->num_multichan_concurrent) {
1008                                 wpa_dbg(wpa_s, MSG_DEBUG, "Scan only the current operating channels since all channels are already used");
1009                         } else {
1010                                 os_free(params.freqs);
1011                                 params.freqs = NULL;
1012                         }
1013                 }
1014         }
1015 #endif /* CONFIG_P2P */
1016
1017         ret = wpa_supplicant_trigger_scan(wpa_s, scan_params);
1018
1019         if (ret && wpa_s->last_scan_req == MANUAL_SCAN_REQ && params.freqs &&
1020             !wpa_s->manual_scan_freqs) {
1021                 /* Restore manual_scan_freqs for the next attempt */
1022                 wpa_s->manual_scan_freqs = params.freqs;
1023                 params.freqs = NULL;
1024         }
1025
1026         wpabuf_free(extra_ie);
1027         os_free(params.freqs);
1028         os_free(params.filter_ssids);
1029
1030         if (ret) {
1031                 wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate AP scan");
1032                 if (wpa_s->scan_prev_wpa_state != wpa_s->wpa_state)
1033                         wpa_supplicant_set_state(wpa_s,
1034                                                  wpa_s->scan_prev_wpa_state);
1035                 /* Restore scan_req since we will try to scan again */
1036                 wpa_s->scan_req = wpa_s->last_scan_req;
1037                 wpa_supplicant_req_scan(wpa_s, 1, 0);
1038         } else {
1039                 wpa_s->scan_for_connection = 0;
1040 #ifdef CONFIG_INTERWORKING
1041                 wpa_s->interworking_fast_assoc_tried = 0;
1042 #endif /* CONFIG_INTERWORKING */
1043         }
1044 }
1045
1046
1047 void wpa_supplicant_update_scan_int(struct wpa_supplicant *wpa_s, int sec)
1048 {
1049         struct os_reltime remaining, new_int;
1050         int cancelled;
1051
1052         cancelled = eloop_cancel_timeout_one(wpa_supplicant_scan, wpa_s, NULL,
1053                                              &remaining);
1054
1055         new_int.sec = sec;
1056         new_int.usec = 0;
1057         if (cancelled && os_reltime_before(&remaining, &new_int)) {
1058                 new_int.sec = remaining.sec;
1059                 new_int.usec = remaining.usec;
1060         }
1061
1062         if (cancelled) {
1063                 eloop_register_timeout(new_int.sec, new_int.usec,
1064                                        wpa_supplicant_scan, wpa_s, NULL);
1065         }
1066         wpa_s->scan_interval = sec;
1067 }
1068
1069
1070 /**
1071  * wpa_supplicant_req_scan - Schedule a scan for neighboring access points
1072  * @wpa_s: Pointer to wpa_supplicant data
1073  * @sec: Number of seconds after which to scan
1074  * @usec: Number of microseconds after which to scan
1075  *
1076  * This function is used to schedule a scan for neighboring access points after
1077  * the specified time.
1078  */
1079 void wpa_supplicant_req_scan(struct wpa_supplicant *wpa_s, int sec, int usec)
1080 {
1081         int res;
1082
1083         if (wpa_s->p2p_mgmt) {
1084                 wpa_dbg(wpa_s, MSG_DEBUG,
1085                         "Ignore scan request (%d.%06d sec) on p2p_mgmt interface",
1086                         sec, usec);
1087                 return;
1088         }
1089
1090         res = eloop_deplete_timeout(sec, usec, wpa_supplicant_scan, wpa_s,
1091                                     NULL);
1092         if (res == 1) {
1093                 wpa_dbg(wpa_s, MSG_DEBUG, "Rescheduling scan request: %d.%06d sec",
1094                         sec, usec);
1095         } else if (res == 0) {
1096                 wpa_dbg(wpa_s, MSG_DEBUG, "Ignore new scan request for %d.%06d sec since an earlier request is scheduled to trigger sooner",
1097                         sec, usec);
1098         } else {
1099                 wpa_dbg(wpa_s, MSG_DEBUG, "Setting scan request: %d.%06d sec",
1100                         sec, usec);
1101                 eloop_register_timeout(sec, usec, wpa_supplicant_scan, wpa_s, NULL);
1102         }
1103 }
1104
1105
1106 /**
1107  * wpa_supplicant_delayed_sched_scan - Request a delayed scheduled scan
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  * Returns: 0 on success or -1 otherwise
1112  *
1113  * This function is used to schedule periodic scans for neighboring
1114  * access points after the specified time.
1115  */
1116 int wpa_supplicant_delayed_sched_scan(struct wpa_supplicant *wpa_s,
1117                                       int sec, int usec)
1118 {
1119         if (!wpa_s->sched_scan_supported)
1120                 return -1;
1121
1122         eloop_register_timeout(sec, usec,
1123                                wpa_supplicant_delayed_sched_scan_timeout,
1124                                wpa_s, NULL);
1125
1126         return 0;
1127 }
1128
1129
1130 /**
1131  * wpa_supplicant_req_sched_scan - Start a periodic scheduled scan
1132  * @wpa_s: Pointer to wpa_supplicant data
1133  * Returns: 0 is sched_scan was started or -1 otherwise
1134  *
1135  * This function is used to schedule periodic scans for neighboring
1136  * access points repeating the scan continuously.
1137  */
1138 int wpa_supplicant_req_sched_scan(struct wpa_supplicant *wpa_s)
1139 {
1140         struct wpa_driver_scan_params params;
1141         struct wpa_driver_scan_params *scan_params;
1142         enum wpa_states prev_state;
1143         struct wpa_ssid *ssid = NULL;
1144         struct wpabuf *extra_ie = NULL;
1145         int ret;
1146         unsigned int max_sched_scan_ssids;
1147         int wildcard = 0;
1148         int need_ssids;
1149
1150         if (!wpa_s->sched_scan_supported)
1151                 return -1;
1152
1153         if (wpa_s->max_sched_scan_ssids > WPAS_MAX_SCAN_SSIDS)
1154                 max_sched_scan_ssids = WPAS_MAX_SCAN_SSIDS;
1155         else
1156                 max_sched_scan_ssids = wpa_s->max_sched_scan_ssids;
1157         if (max_sched_scan_ssids < 1 || wpa_s->conf->disable_scan_offload)
1158                 return -1;
1159
1160         if (wpa_s->sched_scanning) {
1161                 wpa_dbg(wpa_s, MSG_DEBUG, "Already sched scanning");
1162                 return 0;
1163         }
1164
1165         need_ssids = 0;
1166         for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
1167                 if (!wpas_network_disabled(wpa_s, ssid) && !ssid->scan_ssid) {
1168                         /* Use wildcard SSID to find this network */
1169                         wildcard = 1;
1170                 } else if (!wpas_network_disabled(wpa_s, ssid) &&
1171                            ssid->ssid_len)
1172                         need_ssids++;
1173
1174 #ifdef CONFIG_WPS
1175                 if (!wpas_network_disabled(wpa_s, ssid) &&
1176                     ssid->key_mgmt == WPA_KEY_MGMT_WPS) {
1177                         /*
1178                          * Normal scan is more reliable and faster for WPS
1179                          * operations and since these are for short periods of
1180                          * time, the benefit of trying to use sched_scan would
1181                          * be limited.
1182                          */
1183                         wpa_dbg(wpa_s, MSG_DEBUG, "Use normal scan instead of "
1184                                 "sched_scan for WPS");
1185                         return -1;
1186                 }
1187 #endif /* CONFIG_WPS */
1188         }
1189         if (wildcard)
1190                 need_ssids++;
1191
1192         if (wpa_s->normal_scans < 3 &&
1193             (need_ssids <= wpa_s->max_scan_ssids ||
1194              wpa_s->max_scan_ssids >= (int) max_sched_scan_ssids)) {
1195                 /*
1196                  * When normal scan can speed up operations, use that for the
1197                  * first operations before starting the sched_scan to allow
1198                  * user space sleep more. We do this only if the normal scan
1199                  * has functionality that is suitable for this or if the
1200                  * sched_scan does not have better support for multiple SSIDs.
1201                  */
1202                 wpa_dbg(wpa_s, MSG_DEBUG, "Use normal scan instead of "
1203                         "sched_scan for initial scans (normal_scans=%d)",
1204                         wpa_s->normal_scans);
1205                 return -1;
1206         }
1207
1208         os_memset(&params, 0, sizeof(params));
1209
1210         /* If we can't allocate space for the filters, we just don't filter */
1211         params.filter_ssids = os_calloc(wpa_s->max_match_sets,
1212                                         sizeof(struct wpa_driver_scan_filter));
1213
1214         prev_state = wpa_s->wpa_state;
1215         if (wpa_s->wpa_state == WPA_DISCONNECTED ||
1216             wpa_s->wpa_state == WPA_INACTIVE)
1217                 wpa_supplicant_set_state(wpa_s, WPA_SCANNING);
1218
1219         if (wpa_s->autoscan_params != NULL) {
1220                 scan_params = wpa_s->autoscan_params;
1221                 goto scan;
1222         }
1223
1224         /* Find the starting point from which to continue scanning */
1225         ssid = wpa_s->conf->ssid;
1226         if (wpa_s->prev_sched_ssid) {
1227                 while (ssid) {
1228                         if (ssid == wpa_s->prev_sched_ssid) {
1229                                 ssid = ssid->next;
1230                                 break;
1231                         }
1232                         ssid = ssid->next;
1233                 }
1234         }
1235
1236         if (!ssid || !wpa_s->prev_sched_ssid) {
1237                 wpa_dbg(wpa_s, MSG_DEBUG, "Beginning of SSID list");
1238                 if (wpa_s->conf->sched_scan_interval)
1239                         wpa_s->sched_scan_interval =
1240                                 wpa_s->conf->sched_scan_interval;
1241                 if (wpa_s->sched_scan_interval == 0)
1242                         wpa_s->sched_scan_interval = 10;
1243                 wpa_s->sched_scan_timeout = max_sched_scan_ssids * 2;
1244                 wpa_s->first_sched_scan = 1;
1245                 ssid = wpa_s->conf->ssid;
1246                 wpa_s->prev_sched_ssid = ssid;
1247         }
1248
1249         if (wildcard) {
1250                 wpa_dbg(wpa_s, MSG_DEBUG, "Add wildcard SSID to sched_scan");
1251                 params.num_ssids++;
1252         }
1253
1254         while (ssid) {
1255                 if (wpas_network_disabled(wpa_s, ssid))
1256                         goto next;
1257
1258                 if (params.num_filter_ssids < wpa_s->max_match_sets &&
1259                     params.filter_ssids && ssid->ssid && ssid->ssid_len) {
1260                         wpa_dbg(wpa_s, MSG_DEBUG, "add to filter ssid: %s",
1261                                 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
1262                         os_memcpy(params.filter_ssids[params.num_filter_ssids].ssid,
1263                                   ssid->ssid, ssid->ssid_len);
1264                         params.filter_ssids[params.num_filter_ssids].ssid_len =
1265                                 ssid->ssid_len;
1266                         params.num_filter_ssids++;
1267                 } else if (params.filter_ssids && ssid->ssid && ssid->ssid_len)
1268                 {
1269                         wpa_dbg(wpa_s, MSG_DEBUG, "Not enough room for SSID "
1270                                 "filter for sched_scan - drop filter");
1271                         os_free(params.filter_ssids);
1272                         params.filter_ssids = NULL;
1273                         params.num_filter_ssids = 0;
1274                 }
1275
1276                 if (ssid->scan_ssid && ssid->ssid && ssid->ssid_len) {
1277                         if (params.num_ssids == max_sched_scan_ssids)
1278                                 break; /* only room for broadcast SSID */
1279                         wpa_dbg(wpa_s, MSG_DEBUG,
1280                                 "add to active scan ssid: %s",
1281                                 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
1282                         params.ssids[params.num_ssids].ssid =
1283                                 ssid->ssid;
1284                         params.ssids[params.num_ssids].ssid_len =
1285                                 ssid->ssid_len;
1286                         params.num_ssids++;
1287                         if (params.num_ssids >= max_sched_scan_ssids) {
1288                                 wpa_s->prev_sched_ssid = ssid;
1289                                 do {
1290                                         ssid = ssid->next;
1291                                 } while (ssid &&
1292                                          (wpas_network_disabled(wpa_s, ssid) ||
1293                                           !ssid->scan_ssid));
1294                                 break;
1295                         }
1296                 }
1297
1298         next:
1299                 wpa_s->prev_sched_ssid = ssid;
1300                 ssid = ssid->next;
1301         }
1302
1303         if (params.num_filter_ssids == 0) {
1304                 os_free(params.filter_ssids);
1305                 params.filter_ssids = NULL;
1306         }
1307
1308         extra_ie = wpa_supplicant_extra_ies(wpa_s);
1309         if (extra_ie) {
1310                 params.extra_ies = wpabuf_head(extra_ie);
1311                 params.extra_ies_len = wpabuf_len(extra_ie);
1312         }
1313
1314         if (wpa_s->conf->filter_rssi)
1315                 params.filter_rssi = wpa_s->conf->filter_rssi;
1316
1317         /* See if user specified frequencies. If so, scan only those. */
1318         if (wpa_s->conf->freq_list && !params.freqs) {
1319                 wpa_dbg(wpa_s, MSG_DEBUG,
1320                         "Optimize scan based on conf->freq_list");
1321                 int_array_concat(&params.freqs, wpa_s->conf->freq_list);
1322         }
1323
1324         scan_params = &params;
1325
1326 scan:
1327         if (ssid || !wpa_s->first_sched_scan) {
1328                 wpa_dbg(wpa_s, MSG_DEBUG,
1329                         "Starting sched scan: interval %d timeout %d",
1330                         wpa_s->sched_scan_interval, wpa_s->sched_scan_timeout);
1331         } else {
1332                 wpa_dbg(wpa_s, MSG_DEBUG,
1333                         "Starting sched scan: interval %d (no timeout)",
1334                         wpa_s->sched_scan_interval);
1335         }
1336
1337         wpa_setband_scan_freqs(wpa_s, scan_params);
1338
1339         if (wpa_s->mac_addr_rand_enable & MAC_ADDR_RAND_SCHED_SCAN) {
1340                 params.mac_addr_rand = 1;
1341                 if (wpa_s->mac_addr_sched_scan) {
1342                         params.mac_addr = wpa_s->mac_addr_sched_scan;
1343                         params.mac_addr_mask = wpa_s->mac_addr_sched_scan +
1344                                 ETH_ALEN;
1345                 }
1346         }
1347
1348         ret = wpa_supplicant_start_sched_scan(wpa_s, scan_params,
1349                                               wpa_s->sched_scan_interval);
1350         wpabuf_free(extra_ie);
1351         os_free(params.filter_ssids);
1352         if (ret) {
1353                 wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate sched scan");
1354                 if (prev_state != wpa_s->wpa_state)
1355                         wpa_supplicant_set_state(wpa_s, prev_state);
1356                 return ret;
1357         }
1358
1359         /* If we have more SSIDs to scan, add a timeout so we scan them too */
1360         if (ssid || !wpa_s->first_sched_scan) {
1361                 wpa_s->sched_scan_timed_out = 0;
1362                 eloop_register_timeout(wpa_s->sched_scan_timeout, 0,
1363                                        wpa_supplicant_sched_scan_timeout,
1364                                        wpa_s, NULL);
1365                 wpa_s->first_sched_scan = 0;
1366                 wpa_s->sched_scan_timeout /= 2;
1367                 wpa_s->sched_scan_interval *= 2;
1368                 if (wpa_s->sched_scan_timeout < wpa_s->sched_scan_interval) {
1369                         wpa_s->sched_scan_interval = 10;
1370                         wpa_s->sched_scan_timeout = max_sched_scan_ssids * 2;
1371                 }
1372         }
1373
1374         /* If there is no more ssids, start next time from the beginning */
1375         if (!ssid)
1376                 wpa_s->prev_sched_ssid = NULL;
1377
1378         return 0;
1379 }
1380
1381
1382 /**
1383  * wpa_supplicant_cancel_scan - Cancel a scheduled scan request
1384  * @wpa_s: Pointer to wpa_supplicant data
1385  *
1386  * This function is used to cancel a scan request scheduled with
1387  * wpa_supplicant_req_scan().
1388  */
1389 void wpa_supplicant_cancel_scan(struct wpa_supplicant *wpa_s)
1390 {
1391         wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling scan request");
1392         eloop_cancel_timeout(wpa_supplicant_scan, wpa_s, NULL);
1393 }
1394
1395
1396 /**
1397  * wpa_supplicant_cancel_delayed_sched_scan - Stop a delayed scheduled scan
1398  * @wpa_s: Pointer to wpa_supplicant data
1399  *
1400  * This function is used to stop a delayed scheduled scan.
1401  */
1402 void wpa_supplicant_cancel_delayed_sched_scan(struct wpa_supplicant *wpa_s)
1403 {
1404         if (!wpa_s->sched_scan_supported)
1405                 return;
1406
1407         wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling delayed sched scan");
1408         eloop_cancel_timeout(wpa_supplicant_delayed_sched_scan_timeout,
1409                              wpa_s, NULL);
1410 }
1411
1412
1413 /**
1414  * wpa_supplicant_cancel_sched_scan - Stop running scheduled scans
1415  * @wpa_s: Pointer to wpa_supplicant data
1416  *
1417  * This function is used to stop a periodic scheduled scan.
1418  */
1419 void wpa_supplicant_cancel_sched_scan(struct wpa_supplicant *wpa_s)
1420 {
1421         if (!wpa_s->sched_scanning)
1422                 return;
1423
1424         wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling sched scan");
1425         eloop_cancel_timeout(wpa_supplicant_sched_scan_timeout, wpa_s, NULL);
1426         wpa_supplicant_stop_sched_scan(wpa_s);
1427 }
1428
1429
1430 /**
1431  * wpa_supplicant_notify_scanning - Indicate possible scan state change
1432  * @wpa_s: Pointer to wpa_supplicant data
1433  * @scanning: Whether scanning is currently in progress
1434  *
1435  * This function is to generate scanning notifycations. It is called whenever
1436  * there may have been a change in scanning (scan started, completed, stopped).
1437  * wpas_notify_scanning() is called whenever the scanning state changed from the
1438  * previously notified state.
1439  */
1440 void wpa_supplicant_notify_scanning(struct wpa_supplicant *wpa_s,
1441                                     int scanning)
1442 {
1443         if (wpa_s->scanning != scanning) {
1444                 wpa_s->scanning = scanning;
1445                 wpas_notify_scanning(wpa_s);
1446         }
1447 }
1448
1449
1450 static int wpa_scan_get_max_rate(const struct wpa_scan_res *res)
1451 {
1452         int rate = 0;
1453         const u8 *ie;
1454         int i;
1455
1456         ie = wpa_scan_get_ie(res, WLAN_EID_SUPP_RATES);
1457         for (i = 0; ie && i < ie[1]; i++) {
1458                 if ((ie[i + 2] & 0x7f) > rate)
1459                         rate = ie[i + 2] & 0x7f;
1460         }
1461
1462         ie = wpa_scan_get_ie(res, WLAN_EID_EXT_SUPP_RATES);
1463         for (i = 0; ie && i < ie[1]; i++) {
1464                 if ((ie[i + 2] & 0x7f) > rate)
1465                         rate = ie[i + 2] & 0x7f;
1466         }
1467
1468         return rate;
1469 }
1470
1471
1472 /**
1473  * wpa_scan_get_ie - Fetch a specified information element from a scan result
1474  * @res: Scan result entry
1475  * @ie: Information element identitifier (WLAN_EID_*)
1476  * Returns: Pointer to the information element (id field) or %NULL if not found
1477  *
1478  * This function returns the first matching information element in the scan
1479  * result.
1480  */
1481 const u8 * wpa_scan_get_ie(const struct wpa_scan_res *res, u8 ie)
1482 {
1483         const u8 *end, *pos;
1484
1485         pos = (const u8 *) (res + 1);
1486         end = pos + res->ie_len;
1487
1488         while (pos + 1 < end) {
1489                 if (pos + 2 + pos[1] > end)
1490                         break;
1491                 if (pos[0] == ie)
1492                         return pos;
1493                 pos += 2 + pos[1];
1494         }
1495
1496         return NULL;
1497 }
1498
1499
1500 /**
1501  * wpa_scan_get_vendor_ie - Fetch vendor information element from a scan result
1502  * @res: Scan result entry
1503  * @vendor_type: Vendor type (four octets starting the IE payload)
1504  * Returns: Pointer to the information element (id field) or %NULL if not found
1505  *
1506  * This function returns the first matching information element in the scan
1507  * result.
1508  */
1509 const u8 * wpa_scan_get_vendor_ie(const struct wpa_scan_res *res,
1510                                   u32 vendor_type)
1511 {
1512         const u8 *end, *pos;
1513
1514         pos = (const u8 *) (res + 1);
1515         end = pos + res->ie_len;
1516
1517         while (pos + 1 < end) {
1518                 if (pos + 2 + pos[1] > end)
1519                         break;
1520                 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1521                     vendor_type == WPA_GET_BE32(&pos[2]))
1522                         return pos;
1523                 pos += 2 + pos[1];
1524         }
1525
1526         return NULL;
1527 }
1528
1529
1530 /**
1531  * wpa_scan_get_vendor_ie_beacon - Fetch vendor information from a scan result
1532  * @res: Scan result entry
1533  * @vendor_type: Vendor type (four octets starting the IE payload)
1534  * Returns: Pointer to the information element (id field) or %NULL if not found
1535  *
1536  * This function returns the first matching information element in the scan
1537  * result.
1538  *
1539  * This function is like wpa_scan_get_vendor_ie(), but uses IE buffer only
1540  * from Beacon frames instead of either Beacon or Probe Response frames.
1541  */
1542 const u8 * wpa_scan_get_vendor_ie_beacon(const struct wpa_scan_res *res,
1543                                          u32 vendor_type)
1544 {
1545         const u8 *end, *pos;
1546
1547         if (res->beacon_ie_len == 0)
1548                 return NULL;
1549
1550         pos = (const u8 *) (res + 1);
1551         pos += res->ie_len;
1552         end = pos + res->beacon_ie_len;
1553
1554         while (pos + 1 < end) {
1555                 if (pos + 2 + pos[1] > end)
1556                         break;
1557                 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1558                     vendor_type == WPA_GET_BE32(&pos[2]))
1559                         return pos;
1560                 pos += 2 + pos[1];
1561         }
1562
1563         return NULL;
1564 }
1565
1566
1567 /**
1568  * wpa_scan_get_vendor_ie_multi - Fetch vendor IE data from a scan result
1569  * @res: Scan result entry
1570  * @vendor_type: Vendor type (four octets starting the IE payload)
1571  * Returns: Pointer to the information element payload or %NULL if not found
1572  *
1573  * This function returns concatenated payload of possibly fragmented vendor
1574  * specific information elements in the scan result. The caller is responsible
1575  * for freeing the returned buffer.
1576  */
1577 struct wpabuf * wpa_scan_get_vendor_ie_multi(const struct wpa_scan_res *res,
1578                                              u32 vendor_type)
1579 {
1580         struct wpabuf *buf;
1581         const u8 *end, *pos;
1582
1583         buf = wpabuf_alloc(res->ie_len);
1584         if (buf == NULL)
1585                 return NULL;
1586
1587         pos = (const u8 *) (res + 1);
1588         end = pos + res->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                         wpabuf_put_data(buf, pos + 2 + 4, pos[1] - 4);
1596                 pos += 2 + pos[1];
1597         }
1598
1599         if (wpabuf_len(buf) == 0) {
1600                 wpabuf_free(buf);
1601                 buf = NULL;
1602         }
1603
1604         return buf;
1605 }
1606
1607
1608 /*
1609  * Channels with a great SNR can operate at full rate. What is a great SNR?
1610  * This doc https://supportforums.cisco.com/docs/DOC-12954 says, "the general
1611  * rule of thumb is that any SNR above 20 is good." This one
1612  * http://www.cisco.com/en/US/tech/tk722/tk809/technologies_q_and_a_item09186a00805e9a96.shtml#qa23
1613  * recommends 25 as a minimum SNR for 54 Mbps data rate. 30 is chosen here as a
1614  * conservative value.
1615  */
1616 #define GREAT_SNR 30
1617
1618 #define IS_5GHZ(n) (n > 4000)
1619
1620 /* Compare function for sorting scan results. Return >0 if @b is considered
1621  * better. */
1622 static int wpa_scan_result_compar(const void *a, const void *b)
1623 {
1624 #define MIN(a,b) a < b ? a : b
1625         struct wpa_scan_res **_wa = (void *) a;
1626         struct wpa_scan_res **_wb = (void *) b;
1627         struct wpa_scan_res *wa = *_wa;
1628         struct wpa_scan_res *wb = *_wb;
1629         int wpa_a, wpa_b;
1630         int snr_a, snr_b, snr_a_full, snr_b_full;
1631
1632         /* WPA/WPA2 support preferred */
1633         wpa_a = wpa_scan_get_vendor_ie(wa, WPA_IE_VENDOR_TYPE) != NULL ||
1634                 wpa_scan_get_ie(wa, WLAN_EID_RSN) != NULL;
1635         wpa_b = wpa_scan_get_vendor_ie(wb, WPA_IE_VENDOR_TYPE) != NULL ||
1636                 wpa_scan_get_ie(wb, WLAN_EID_RSN) != NULL;
1637
1638         if (wpa_b && !wpa_a)
1639                 return 1;
1640         if (!wpa_b && wpa_a)
1641                 return -1;
1642
1643         /* privacy support preferred */
1644         if ((wa->caps & IEEE80211_CAP_PRIVACY) == 0 &&
1645             (wb->caps & IEEE80211_CAP_PRIVACY))
1646                 return 1;
1647         if ((wa->caps & IEEE80211_CAP_PRIVACY) &&
1648             (wb->caps & IEEE80211_CAP_PRIVACY) == 0)
1649                 return -1;
1650
1651         if (wa->flags & wb->flags & WPA_SCAN_LEVEL_DBM) {
1652                 snr_a_full = wa->snr;
1653                 snr_a = MIN(wa->snr, GREAT_SNR);
1654                 snr_b_full = wb->snr;
1655                 snr_b = MIN(wa->snr, GREAT_SNR);
1656         } else {
1657                 /* Level is not in dBm, so we can't calculate
1658                  * SNR. Just use raw level (units unknown). */
1659                 snr_a = snr_a_full = wa->level;
1660                 snr_b = snr_b_full = wb->level;
1661         }
1662
1663         /* if SNR is close, decide by max rate or frequency band */
1664         if ((snr_a && snr_b && abs(snr_b - snr_a) < 5) ||
1665             (wa->qual && wb->qual && abs(wb->qual - wa->qual) < 10)) {
1666                 if (wa->est_throughput != wb->est_throughput)
1667                         return wb->est_throughput - wa->est_throughput;
1668                 if (IS_5GHZ(wa->freq) ^ IS_5GHZ(wb->freq))
1669                         return IS_5GHZ(wa->freq) ? -1 : 1;
1670         }
1671
1672         /* all things being equal, use SNR; if SNRs are
1673          * identical, use quality values since some drivers may only report
1674          * that value and leave the signal level zero */
1675         if (snr_b_full == snr_a_full)
1676                 return wb->qual - wa->qual;
1677         return snr_b_full - snr_a_full;
1678 #undef MIN
1679 }
1680
1681
1682 #ifdef CONFIG_WPS
1683 /* Compare function for sorting scan results when searching a WPS AP for
1684  * provisioning. Return >0 if @b is considered better. */
1685 static int wpa_scan_result_wps_compar(const void *a, const void *b)
1686 {
1687         struct wpa_scan_res **_wa = (void *) a;
1688         struct wpa_scan_res **_wb = (void *) b;
1689         struct wpa_scan_res *wa = *_wa;
1690         struct wpa_scan_res *wb = *_wb;
1691         int uses_wps_a, uses_wps_b;
1692         struct wpabuf *wps_a, *wps_b;
1693         int res;
1694
1695         /* Optimization - check WPS IE existence before allocated memory and
1696          * doing full reassembly. */
1697         uses_wps_a = wpa_scan_get_vendor_ie(wa, WPS_IE_VENDOR_TYPE) != NULL;
1698         uses_wps_b = wpa_scan_get_vendor_ie(wb, WPS_IE_VENDOR_TYPE) != NULL;
1699         if (uses_wps_a && !uses_wps_b)
1700                 return -1;
1701         if (!uses_wps_a && uses_wps_b)
1702                 return 1;
1703
1704         if (uses_wps_a && uses_wps_b) {
1705                 wps_a = wpa_scan_get_vendor_ie_multi(wa, WPS_IE_VENDOR_TYPE);
1706                 wps_b = wpa_scan_get_vendor_ie_multi(wb, WPS_IE_VENDOR_TYPE);
1707                 res = wps_ap_priority_compar(wps_a, wps_b);
1708                 wpabuf_free(wps_a);
1709                 wpabuf_free(wps_b);
1710                 if (res)
1711                         return res;
1712         }
1713
1714         /*
1715          * Do not use current AP security policy as a sorting criteria during
1716          * WPS provisioning step since the AP may get reconfigured at the
1717          * completion of provisioning.
1718          */
1719
1720         /* all things being equal, use signal level; if signal levels are
1721          * identical, use quality values since some drivers may only report
1722          * that value and leave the signal level zero */
1723         if (wb->level == wa->level)
1724                 return wb->qual - wa->qual;
1725         return wb->level - wa->level;
1726 }
1727 #endif /* CONFIG_WPS */
1728
1729
1730 static void dump_scan_res(struct wpa_scan_results *scan_res)
1731 {
1732 #ifndef CONFIG_NO_STDOUT_DEBUG
1733         size_t i;
1734
1735         if (scan_res->res == NULL || scan_res->num == 0)
1736                 return;
1737
1738         wpa_printf(MSG_EXCESSIVE, "Sorted scan results");
1739
1740         for (i = 0; i < scan_res->num; i++) {
1741                 struct wpa_scan_res *r = scan_res->res[i];
1742                 u8 *pos;
1743                 if (r->flags & WPA_SCAN_LEVEL_DBM) {
1744                         int noise_valid = !(r->flags & WPA_SCAN_NOISE_INVALID);
1745
1746                         wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d "
1747                                    "noise=%d%s level=%d snr=%d%s flags=0x%x age=%u est=%u",
1748                                    MAC2STR(r->bssid), r->freq, r->qual,
1749                                    r->noise, noise_valid ? "" : "~", r->level,
1750                                    r->snr, r->snr >= GREAT_SNR ? "*" : "",
1751                                    r->flags,
1752                                    r->age, r->est_throughput);
1753                 } else {
1754                         wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d "
1755                                    "noise=%d level=%d flags=0x%x age=%u est=%u",
1756                                    MAC2STR(r->bssid), r->freq, r->qual,
1757                                    r->noise, r->level, r->flags, r->age,
1758                                    r->est_throughput);
1759                 }
1760                 pos = (u8 *) (r + 1);
1761                 if (r->ie_len)
1762                         wpa_hexdump(MSG_EXCESSIVE, "IEs", pos, r->ie_len);
1763                 pos += r->ie_len;
1764                 if (r->beacon_ie_len)
1765                         wpa_hexdump(MSG_EXCESSIVE, "Beacon IEs",
1766                                     pos, r->beacon_ie_len);
1767         }
1768 #endif /* CONFIG_NO_STDOUT_DEBUG */
1769 }
1770
1771
1772 /**
1773  * wpa_supplicant_filter_bssid_match - Is the specified BSSID allowed
1774  * @wpa_s: Pointer to wpa_supplicant data
1775  * @bssid: BSSID to check
1776  * Returns: 0 if the BSSID is filtered or 1 if not
1777  *
1778  * This function is used to filter out specific BSSIDs from scan reslts mainly
1779  * for testing purposes (SET bssid_filter ctrl_iface command).
1780  */
1781 int wpa_supplicant_filter_bssid_match(struct wpa_supplicant *wpa_s,
1782                                       const u8 *bssid)
1783 {
1784         size_t i;
1785
1786         if (wpa_s->bssid_filter == NULL)
1787                 return 1;
1788
1789         for (i = 0; i < wpa_s->bssid_filter_count; i++) {
1790                 if (os_memcmp(wpa_s->bssid_filter + i * ETH_ALEN, bssid,
1791                               ETH_ALEN) == 0)
1792                         return 1;
1793         }
1794
1795         return 0;
1796 }
1797
1798
1799 static void filter_scan_res(struct wpa_supplicant *wpa_s,
1800                             struct wpa_scan_results *res)
1801 {
1802         size_t i, j;
1803
1804         if (wpa_s->bssid_filter == NULL)
1805                 return;
1806
1807         for (i = 0, j = 0; i < res->num; i++) {
1808                 if (wpa_supplicant_filter_bssid_match(wpa_s,
1809                                                       res->res[i]->bssid)) {
1810                         res->res[j++] = res->res[i];
1811                 } else {
1812                         os_free(res->res[i]);
1813                         res->res[i] = NULL;
1814                 }
1815         }
1816
1817         if (res->num != j) {
1818                 wpa_printf(MSG_DEBUG, "Filtered out %d scan results",
1819                            (int) (res->num - j));
1820                 res->num = j;
1821         }
1822 }
1823
1824
1825 /*
1826  * Noise floor values to use when we have signal strength
1827  * measurements, but no noise floor measurments. These values were
1828  * measured in an office environment with many APs.
1829  */
1830 #define DEFAULT_NOISE_FLOOR_2GHZ (-89)
1831 #define DEFAULT_NOISE_FLOOR_5GHZ (-92)
1832
1833 static void scan_snr(struct wpa_scan_res *res)
1834 {
1835         if (res->flags & WPA_SCAN_NOISE_INVALID) {
1836                 res->noise = IS_5GHZ(res->freq) ?
1837                         DEFAULT_NOISE_FLOOR_5GHZ :
1838                         DEFAULT_NOISE_FLOOR_2GHZ;
1839         }
1840
1841         if (res->flags & WPA_SCAN_LEVEL_DBM) {
1842                 res->snr = res->level - res->noise;
1843         } else {
1844                 /* Level is not in dBm, so we can't calculate
1845                  * SNR. Just use raw level (units unknown). */
1846                 res->snr = res->level;
1847         }
1848 }
1849
1850
1851 static unsigned int max_ht20_rate(int snr)
1852 {
1853         if (snr < 6)
1854                 return 6500; /* HT20 MCS0 */
1855         if (snr < 8)
1856                 return 13000; /* HT20 MCS1 */
1857         if (snr < 13)
1858                 return 19500; /* HT20 MCS2 */
1859         if (snr < 17)
1860                 return 26000; /* HT20 MCS3 */
1861         if (snr < 20)
1862                 return 39000; /* HT20 MCS4 */
1863         if (snr < 23)
1864                 return 52000; /* HT20 MCS5 */
1865         if (snr < 24)
1866                 return 58500; /* HT20 MCS6 */
1867         return 65000; /* HT20 MCS7 */
1868 }
1869
1870
1871 static unsigned int max_ht40_rate(int snr)
1872 {
1873         if (snr < 3)
1874                 return 13500; /* HT40 MCS0 */
1875         if (snr < 6)
1876                 return 27000; /* HT40 MCS1 */
1877         if (snr < 10)
1878                 return 40500; /* HT40 MCS2 */
1879         if (snr < 15)
1880                 return 54000; /* HT40 MCS3 */
1881         if (snr < 17)
1882                 return 81000; /* HT40 MCS4 */
1883         if (snr < 22)
1884                 return 108000; /* HT40 MCS5 */
1885         if (snr < 24)
1886                 return 121500; /* HT40 MCS6 */
1887         return 135000; /* HT40 MCS7 */
1888 }
1889
1890
1891 static unsigned int max_vht80_rate(int snr)
1892 {
1893         if (snr < 1)
1894                 return 0;
1895         if (snr < 2)
1896                 return 29300; /* VHT80 MCS0 */
1897         if (snr < 5)
1898                 return 58500; /* VHT80 MCS1 */
1899         if (snr < 9)
1900                 return 87800; /* VHT80 MCS2 */
1901         if (snr < 11)
1902                 return 117000; /* VHT80 MCS3 */
1903         if (snr < 15)
1904                 return 175500; /* VHT80 MCS4 */
1905         if (snr < 16)
1906                 return 234000; /* VHT80 MCS5 */
1907         if (snr < 18)
1908                 return 263300; /* VHT80 MCS6 */
1909         if (snr < 20)
1910                 return 292500; /* VHT80 MCS7 */
1911         if (snr < 22)
1912                 return 351000; /* VHT80 MCS8 */
1913         return 390000; /* VHT80 MCS9 */
1914 }
1915
1916
1917 static void scan_est_throughput(struct wpa_supplicant *wpa_s,
1918                                 struct wpa_scan_res *res)
1919 {
1920         enum local_hw_capab capab = wpa_s->hw_capab;
1921         int rate; /* max legacy rate in 500 kb/s units */
1922         const u8 *ie;
1923         unsigned int est, tmp;
1924         int snr = res->snr;
1925
1926         if (res->est_throughput)
1927                 return;
1928
1929         /* Get maximum legacy rate */
1930         rate = wpa_scan_get_max_rate(res);
1931
1932         /* Limit based on estimated SNR */
1933         if (rate > 1 * 2 && snr < 1)
1934                 rate = 1 * 2;
1935         else if (rate > 2 * 2 && snr < 4)
1936                 rate = 2 * 2;
1937         else if (rate > 6 * 2 && snr < 5)
1938                 rate = 6 * 2;
1939         else if (rate > 9 * 2 && snr < 6)
1940                 rate = 9 * 2;
1941         else if (rate > 12 * 2 && snr < 7)
1942                 rate = 12 * 2;
1943         else if (rate > 18 * 2 && snr < 10)
1944                 rate = 18 * 2;
1945         else if (rate > 24 * 2 && snr < 11)
1946                 rate = 24 * 2;
1947         else if (rate > 36 * 2 && snr < 15)
1948                 rate = 36 * 2;
1949         else if (rate > 48 * 2 && snr < 19)
1950                 rate = 48 * 2;
1951         else if (rate > 54 * 2 && snr < 21)
1952                 rate = 54 * 2;
1953         est = rate * 500;
1954
1955         if (capab == CAPAB_HT || capab == CAPAB_HT40 || capab == CAPAB_VHT) {
1956                 ie = wpa_scan_get_ie(res, WLAN_EID_HT_CAP);
1957                 if (ie) {
1958                         tmp = max_ht20_rate(snr);
1959                         if (tmp > est)
1960                                 est = tmp;
1961                 }
1962         }
1963
1964         if (capab == CAPAB_HT40 || capab == CAPAB_VHT) {
1965                 ie = wpa_scan_get_ie(res, WLAN_EID_HT_OPERATION);
1966                 if (ie && ie[1] >= 2 &&
1967                     (ie[3] & HT_INFO_HT_PARAM_SECONDARY_CHNL_OFF_MASK)) {
1968                         tmp = max_ht40_rate(snr);
1969                         if (tmp > est)
1970                                 est = tmp;
1971                 }
1972         }
1973
1974         if (capab == CAPAB_VHT) {
1975                 /* Use +1 to assume VHT is always faster than HT */
1976                 ie = wpa_scan_get_ie(res, WLAN_EID_VHT_CAP);
1977                 if (ie) {
1978                         tmp = max_ht20_rate(snr) + 1;
1979                         if (tmp > est)
1980                                 est = tmp;
1981
1982                         ie = wpa_scan_get_ie(res, WLAN_EID_HT_OPERATION);
1983                         if (ie && ie[1] >= 2 &&
1984                             (ie[3] &
1985                              HT_INFO_HT_PARAM_SECONDARY_CHNL_OFF_MASK)) {
1986                                 tmp = max_ht40_rate(snr) + 1;
1987                                 if (tmp > est)
1988                                         est = tmp;
1989                         }
1990
1991                         ie = wpa_scan_get_ie(res, WLAN_EID_VHT_OPERATION);
1992                         if (ie && ie[1] >= 1 &&
1993                             (ie[2] & VHT_OPMODE_CHANNEL_WIDTH_MASK)) {
1994                                 tmp = max_vht80_rate(snr) + 1;
1995                                 if (tmp > est)
1996                                         est = tmp;
1997                         }
1998                 }
1999         }
2000
2001         /* TODO: channel utilization and AP load (e.g., from AP Beacon) */
2002
2003         res->est_throughput = est;
2004 }
2005
2006
2007 /**
2008  * wpa_supplicant_get_scan_results - Get scan results
2009  * @wpa_s: Pointer to wpa_supplicant data
2010  * @info: Information about what was scanned or %NULL if not available
2011  * @new_scan: Whether a new scan was performed
2012  * Returns: Scan results, %NULL on failure
2013  *
2014  * This function request the current scan results from the driver and updates
2015  * the local BSS list wpa_s->bss. The caller is responsible for freeing the
2016  * results with wpa_scan_results_free().
2017  */
2018 struct wpa_scan_results *
2019 wpa_supplicant_get_scan_results(struct wpa_supplicant *wpa_s,
2020                                 struct scan_info *info, int new_scan)
2021 {
2022         struct wpa_scan_results *scan_res;
2023         size_t i;
2024         int (*compar)(const void *, const void *) = wpa_scan_result_compar;
2025
2026         scan_res = wpa_drv_get_scan_results2(wpa_s);
2027         if (scan_res == NULL) {
2028                 wpa_dbg(wpa_s, MSG_DEBUG, "Failed to get scan results");
2029                 return NULL;
2030         }
2031         if (scan_res->fetch_time.sec == 0) {
2032                 /*
2033                  * Make sure we have a valid timestamp if the driver wrapper
2034                  * does not set this.
2035                  */
2036                 os_get_reltime(&scan_res->fetch_time);
2037         }
2038         filter_scan_res(wpa_s, scan_res);
2039
2040         for (i = 0; i < scan_res->num; i++) {
2041                 struct wpa_scan_res *scan_res_item = scan_res->res[i];
2042
2043                 scan_snr(scan_res_item);
2044                 scan_est_throughput(wpa_s, scan_res_item);
2045         }
2046
2047 #ifdef CONFIG_WPS
2048         if (wpas_wps_searching(wpa_s)) {
2049                 wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Order scan results with WPS "
2050                         "provisioning rules");
2051                 compar = wpa_scan_result_wps_compar;
2052         }
2053 #endif /* CONFIG_WPS */
2054
2055         qsort(scan_res->res, scan_res->num, sizeof(struct wpa_scan_res *),
2056               compar);
2057         dump_scan_res(scan_res);
2058
2059         wpa_bss_update_start(wpa_s);
2060         for (i = 0; i < scan_res->num; i++)
2061                 wpa_bss_update_scan_res(wpa_s, scan_res->res[i],
2062                                         &scan_res->fetch_time);
2063         wpa_bss_update_end(wpa_s, info, new_scan);
2064
2065         return scan_res;
2066 }
2067
2068
2069 /**
2070  * wpa_supplicant_update_scan_results - Update scan results from the driver
2071  * @wpa_s: Pointer to wpa_supplicant data
2072  * Returns: 0 on success, -1 on failure
2073  *
2074  * This function updates the BSS table within wpa_supplicant based on the
2075  * currently available scan results from the driver without requesting a new
2076  * scan. This is used in cases where the driver indicates an association
2077  * (including roaming within ESS) and wpa_supplicant does not yet have the
2078  * needed information to complete the connection (e.g., to perform validation
2079  * steps in 4-way handshake).
2080  */
2081 int wpa_supplicant_update_scan_results(struct wpa_supplicant *wpa_s)
2082 {
2083         struct wpa_scan_results *scan_res;
2084         scan_res = wpa_supplicant_get_scan_results(wpa_s, NULL, 0);
2085         if (scan_res == NULL)
2086                 return -1;
2087         wpa_scan_results_free(scan_res);
2088
2089         return 0;
2090 }
2091
2092
2093 /**
2094  * scan_only_handler - Reports scan results
2095  */
2096 void scan_only_handler(struct wpa_supplicant *wpa_s,
2097                        struct wpa_scan_results *scan_res)
2098 {
2099         wpa_dbg(wpa_s, MSG_DEBUG, "Scan-only results received");
2100         if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
2101             wpa_s->manual_scan_use_id && wpa_s->own_scan_running) {
2102                 wpa_msg_ctrl(wpa_s, MSG_INFO, WPA_EVENT_SCAN_RESULTS "id=%u",
2103                              wpa_s->manual_scan_id);
2104                 wpa_s->manual_scan_use_id = 0;
2105         } else {
2106                 wpa_msg_ctrl(wpa_s, MSG_INFO, WPA_EVENT_SCAN_RESULTS);
2107         }
2108         wpas_notify_scan_results(wpa_s);
2109         wpas_notify_scan_done(wpa_s, 1);
2110         if (wpa_s->scan_work) {
2111                 struct wpa_radio_work *work = wpa_s->scan_work;
2112                 wpa_s->scan_work = NULL;
2113                 radio_work_done(work);
2114         }
2115 }
2116
2117
2118 int wpas_scan_scheduled(struct wpa_supplicant *wpa_s)
2119 {
2120         return eloop_is_timeout_registered(wpa_supplicant_scan, wpa_s, NULL);
2121 }
2122
2123
2124 struct wpa_driver_scan_params *
2125 wpa_scan_clone_params(const struct wpa_driver_scan_params *src)
2126 {
2127         struct wpa_driver_scan_params *params;
2128         size_t i;
2129         u8 *n;
2130
2131         params = os_zalloc(sizeof(*params));
2132         if (params == NULL)
2133                 return NULL;
2134
2135         for (i = 0; i < src->num_ssids; i++) {
2136                 if (src->ssids[i].ssid) {
2137                         n = os_malloc(src->ssids[i].ssid_len);
2138                         if (n == NULL)
2139                                 goto failed;
2140                         os_memcpy(n, src->ssids[i].ssid,
2141                                   src->ssids[i].ssid_len);
2142                         params->ssids[i].ssid = n;
2143                         params->ssids[i].ssid_len = src->ssids[i].ssid_len;
2144                 }
2145         }
2146         params->num_ssids = src->num_ssids;
2147
2148         if (src->extra_ies) {
2149                 n = os_malloc(src->extra_ies_len);
2150                 if (n == NULL)
2151                         goto failed;
2152                 os_memcpy(n, src->extra_ies, src->extra_ies_len);
2153                 params->extra_ies = n;
2154                 params->extra_ies_len = src->extra_ies_len;
2155         }
2156
2157         if (src->freqs) {
2158                 int len = int_array_len(src->freqs);
2159                 params->freqs = os_malloc((len + 1) * sizeof(int));
2160                 if (params->freqs == NULL)
2161                         goto failed;
2162                 os_memcpy(params->freqs, src->freqs, (len + 1) * sizeof(int));
2163         }
2164
2165         if (src->filter_ssids) {
2166                 params->filter_ssids = os_malloc(sizeof(*params->filter_ssids) *
2167                                                  src->num_filter_ssids);
2168                 if (params->filter_ssids == NULL)
2169                         goto failed;
2170                 os_memcpy(params->filter_ssids, src->filter_ssids,
2171                           sizeof(*params->filter_ssids) *
2172                           src->num_filter_ssids);
2173                 params->num_filter_ssids = src->num_filter_ssids;
2174         }
2175
2176         params->filter_rssi = src->filter_rssi;
2177         params->p2p_probe = src->p2p_probe;
2178         params->only_new_results = src->only_new_results;
2179         params->low_priority = src->low_priority;
2180
2181         if (src->mac_addr_rand) {
2182                 params->mac_addr_rand = src->mac_addr_rand;
2183
2184                 if (src->mac_addr && src->mac_addr_mask) {
2185                         u8 *mac_addr;
2186
2187                         mac_addr = os_malloc(2 * ETH_ALEN);
2188                         if (!mac_addr)
2189                                 goto failed;
2190
2191                         os_memcpy(mac_addr, src->mac_addr, ETH_ALEN);
2192                         os_memcpy(mac_addr + ETH_ALEN, src->mac_addr_mask,
2193                                   ETH_ALEN);
2194                         params->mac_addr = mac_addr;
2195                         params->mac_addr_mask = mac_addr + ETH_ALEN;
2196                 }
2197         }
2198         return params;
2199
2200 failed:
2201         wpa_scan_free_params(params);
2202         return NULL;
2203 }
2204
2205
2206 void wpa_scan_free_params(struct wpa_driver_scan_params *params)
2207 {
2208         size_t i;
2209
2210         if (params == NULL)
2211                 return;
2212
2213         for (i = 0; i < params->num_ssids; i++)
2214                 os_free((u8 *) params->ssids[i].ssid);
2215         os_free((u8 *) params->extra_ies);
2216         os_free(params->freqs);
2217         os_free(params->filter_ssids);
2218
2219         /*
2220          * Note: params->mac_addr_mask points to same memory allocation and
2221          * must not be freed separately.
2222          */
2223         os_free((u8 *) params->mac_addr);
2224
2225         os_free(params);
2226 }
2227
2228
2229 int wpas_start_pno(struct wpa_supplicant *wpa_s)
2230 {
2231         int ret, interval, prio;
2232         size_t i, num_ssid, num_match_ssid;
2233         struct wpa_ssid *ssid;
2234         struct wpa_driver_scan_params params;
2235
2236         if (!wpa_s->sched_scan_supported)
2237                 return -1;
2238
2239         if (wpa_s->pno || wpa_s->pno_sched_pending)
2240                 return 0;
2241
2242         if ((wpa_s->wpa_state > WPA_SCANNING) &&
2243             (wpa_s->wpa_state <= WPA_COMPLETED)) {
2244                 wpa_printf(MSG_ERROR, "PNO: In assoc process");
2245                 return -EAGAIN;
2246         }
2247
2248         if (wpa_s->wpa_state == WPA_SCANNING) {
2249                 wpa_supplicant_cancel_scan(wpa_s);
2250                 if (wpa_s->sched_scanning) {
2251                         wpa_printf(MSG_DEBUG, "Schedule PNO on completion of "
2252                                    "ongoing sched scan");
2253                         wpa_supplicant_cancel_sched_scan(wpa_s);
2254                         wpa_s->pno_sched_pending = 1;
2255                         return 0;
2256                 }
2257         }
2258
2259         os_memset(&params, 0, sizeof(params));
2260
2261         num_ssid = num_match_ssid = 0;
2262         ssid = wpa_s->conf->ssid;
2263         while (ssid) {
2264                 if (!wpas_network_disabled(wpa_s, ssid)) {
2265                         num_match_ssid++;
2266                         if (ssid->scan_ssid)
2267                                 num_ssid++;
2268                 }
2269                 ssid = ssid->next;
2270         }
2271
2272         if (num_match_ssid == 0) {
2273                 wpa_printf(MSG_DEBUG, "PNO: No configured SSIDs");
2274                 return -1;
2275         }
2276
2277         if (num_match_ssid > num_ssid) {
2278                 params.num_ssids++; /* wildcard */
2279                 num_ssid++;
2280         }
2281
2282         if (num_ssid > WPAS_MAX_SCAN_SSIDS) {
2283                 wpa_printf(MSG_DEBUG, "PNO: Use only the first %u SSIDs from "
2284                            "%u", WPAS_MAX_SCAN_SSIDS, (unsigned int) num_ssid);
2285                 num_ssid = WPAS_MAX_SCAN_SSIDS;
2286         }
2287
2288         if (num_match_ssid > wpa_s->max_match_sets) {
2289                 num_match_ssid = wpa_s->max_match_sets;
2290                 wpa_dbg(wpa_s, MSG_DEBUG, "PNO: Too many SSIDs to match");
2291         }
2292         params.filter_ssids = os_calloc(num_match_ssid,
2293                                         sizeof(struct wpa_driver_scan_filter));
2294         if (params.filter_ssids == NULL)
2295                 return -1;
2296
2297         i = 0;
2298         prio = 0;
2299         ssid = wpa_s->conf->pssid[prio];
2300         while (ssid) {
2301                 if (!wpas_network_disabled(wpa_s, ssid)) {
2302                         if (ssid->scan_ssid && params.num_ssids < num_ssid) {
2303                                 params.ssids[params.num_ssids].ssid =
2304                                         ssid->ssid;
2305                                 params.ssids[params.num_ssids].ssid_len =
2306                                          ssid->ssid_len;
2307                                 params.num_ssids++;
2308                         }
2309                         os_memcpy(params.filter_ssids[i].ssid, ssid->ssid,
2310                                   ssid->ssid_len);
2311                         params.filter_ssids[i].ssid_len = ssid->ssid_len;
2312                         params.num_filter_ssids++;
2313                         i++;
2314                         if (i == num_match_ssid)
2315                                 break;
2316                 }
2317                 if (ssid->pnext)
2318                         ssid = ssid->pnext;
2319                 else if (prio + 1 == wpa_s->conf->num_prio)
2320                         break;
2321                 else
2322                         ssid = wpa_s->conf->pssid[++prio];
2323         }
2324
2325         if (wpa_s->conf->filter_rssi)
2326                 params.filter_rssi = wpa_s->conf->filter_rssi;
2327
2328         interval = wpa_s->conf->sched_scan_interval ?
2329                 wpa_s->conf->sched_scan_interval : 10;
2330
2331         if (params.freqs == NULL && wpa_s->manual_sched_scan_freqs) {
2332                 wpa_dbg(wpa_s, MSG_DEBUG, "Limit sched scan to specified channels");
2333                 params.freqs = wpa_s->manual_sched_scan_freqs;
2334         }
2335
2336         if (wpa_s->mac_addr_rand_enable & MAC_ADDR_RAND_PNO) {
2337                 params.mac_addr_rand = 1;
2338                 if (wpa_s->mac_addr_pno) {
2339                         params.mac_addr = wpa_s->mac_addr_pno;
2340                         params.mac_addr_mask = wpa_s->mac_addr_pno + ETH_ALEN;
2341                 }
2342         }
2343
2344         ret = wpa_supplicant_start_sched_scan(wpa_s, &params, interval);
2345         os_free(params.filter_ssids);
2346         if (ret == 0)
2347                 wpa_s->pno = 1;
2348         else
2349                 wpa_msg(wpa_s, MSG_ERROR, "Failed to schedule PNO");
2350         return ret;
2351 }
2352
2353
2354 int wpas_stop_pno(struct wpa_supplicant *wpa_s)
2355 {
2356         int ret = 0;
2357
2358         if (!wpa_s->pno)
2359                 return 0;
2360
2361         ret = wpa_supplicant_stop_sched_scan(wpa_s);
2362
2363         wpa_s->pno = 0;
2364         wpa_s->pno_sched_pending = 0;
2365
2366         if (wpa_s->wpa_state == WPA_SCANNING)
2367                 wpa_supplicant_req_scan(wpa_s, 0, 0);
2368
2369         return ret;
2370 }
2371
2372
2373 void wpas_mac_addr_rand_scan_clear(struct wpa_supplicant *wpa_s,
2374                                     unsigned int type)
2375 {
2376         type &= MAC_ADDR_RAND_ALL;
2377         wpa_s->mac_addr_rand_enable &= ~type;
2378
2379         if (type & MAC_ADDR_RAND_SCAN) {
2380                 os_free(wpa_s->mac_addr_scan);
2381                 wpa_s->mac_addr_scan = NULL;
2382         }
2383
2384         if (type & MAC_ADDR_RAND_SCHED_SCAN) {
2385                 os_free(wpa_s->mac_addr_sched_scan);
2386                 wpa_s->mac_addr_sched_scan = NULL;
2387         }
2388
2389         if (type & MAC_ADDR_RAND_PNO) {
2390                 os_free(wpa_s->mac_addr_pno);
2391                 wpa_s->mac_addr_pno = NULL;
2392         }
2393 }
2394
2395
2396 int wpas_mac_addr_rand_scan_set(struct wpa_supplicant *wpa_s,
2397                                 unsigned int type, const u8 *addr,
2398                                 const u8 *mask)
2399 {
2400         u8 *tmp = NULL;
2401
2402         wpas_mac_addr_rand_scan_clear(wpa_s, type);
2403
2404         if (addr) {
2405                 tmp = os_malloc(2 * ETH_ALEN);
2406                 if (!tmp)
2407                         return -1;
2408                 os_memcpy(tmp, addr, ETH_ALEN);
2409                 os_memcpy(tmp + ETH_ALEN, mask, ETH_ALEN);
2410         }
2411
2412         if (type == MAC_ADDR_RAND_SCAN) {
2413                 wpa_s->mac_addr_scan = tmp;
2414         } else if (type == MAC_ADDR_RAND_SCHED_SCAN) {
2415                 wpa_s->mac_addr_sched_scan = tmp;
2416         } else if (type == MAC_ADDR_RAND_PNO) {
2417                 wpa_s->mac_addr_pno = tmp;
2418         } else {
2419                 wpa_printf(MSG_INFO,
2420                            "scan: Invalid MAC randomization type=0x%x",
2421                            type);
2422                 os_free(tmp);
2423                 return -1;
2424         }
2425
2426         wpa_s->mac_addr_rand_enable |= type;
2427         return 0;
2428 }