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         while (ssid) {
 100                 if (!wpas_network_disabled(wpa_s, ssid))
 101                         count++;
 102                 else
 103                         disabled++;
 104                 ssid = ssid->next;
 105         }
 106         if (wpa_s->conf->cred && wpa_s->conf->interworking &&
 107             wpa_s->conf->auto_interworking)
 108                 count++;
 109         if (count == 0 && disabled > 0) {
 110                 wpa_dbg(wpa_s, MSG_DEBUG, "No enabled networks (%d disabled "
 111                         "networks)", disabled);
 112         }
 113         return count;
 114 }
 115
 116
 117 static void wpa_supplicant_assoc_try(struct wpa_supplicant *wpa_s,
 118                                      struct wpa_ssid *ssid)
 119 {
 120         while (ssid) {
 121                 if (!wpas_network_disabled(wpa_s, ssid))
 122                         break;
 123                 ssid = ssid->next;
 124         }
 125
 126         /* ap_scan=2 mode - try to associate with each SSID. */
 127         if (ssid == NULL) {
 128                 wpa_dbg(wpa_s, MSG_DEBUG, "wpa_supplicant_assoc_try: Reached "
 129                         "end of scan list - go back to beginning");
 130                 wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
 131                 wpa_supplicant_req_scan(wpa_s, 0, 0);
 132                 return;
 133         }
 134         if (ssid->next) {
 135                 /* Continue from the next SSID on the next attempt. */
 136                 wpa_s->prev_scan_ssid = ssid;
 137         } else {
 138                 /* Start from the beginning of the SSID list. */
 139                 wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
 140         }
 141         wpa_supplicant_associate(wpa_s, NULL, ssid);
 142 }
 143
 144
 145 static void wpas_trigger_scan_cb(struct wpa_radio_work *work, int deinit)
 146 {
 147         struct wpa_supplicant *wpa_s = work->wpa_s;
 148         struct wpa_driver_scan_params *params = work->ctx;
 149         int ret;
 150
 151         if (deinit) {
 152                 if (!work->started) {
 153                         wpa_scan_free_params(params);
 154                         return;
 155                 }
 156                 wpa_supplicant_notify_scanning(wpa_s, 0);
 157                 wpas_notify_scan_done(wpa_s, 0);
 158                 wpa_s->scan_work = NULL;
 159                 return;
 160         }
 161
 162         if (wpas_update_random_addr_disassoc(wpa_s) < 0) {
 163                 wpa_msg(wpa_s, MSG_INFO,
 164                         "Failed to assign random MAC address for a scan");
 165                 radio_work_done(work);
 166                 return;
 167         }
 168
 169         wpa_supplicant_notify_scanning(wpa_s, 1);
 170
 171         if (wpa_s->clear_driver_scan_cache) {
 172                 wpa_printf(MSG_DEBUG,
 173                            "Request driver to clear scan cache due to local BSS flush");
 174                 params->only_new_results = 1;
 175         }
 176         ret = wpa_drv_scan(wpa_s, params);
 177         wpa_scan_free_params(params);
 178         work->ctx = NULL;
 179         if (ret) {
 180                 int retry = wpa_s->last_scan_req != MANUAL_SCAN_REQ;
 181
 182                 if (wpa_s->disconnected)
 183                         retry = 0;
 184
 185                 wpa_supplicant_notify_scanning(wpa_s, 0);
 186                 wpas_notify_scan_done(wpa_s, 0);
 187                 if (wpa_s->wpa_state == WPA_SCANNING)
 188                         wpa_supplicant_set_state(wpa_s,
 189                                                  wpa_s->scan_prev_wpa_state);
 190                 wpa_msg(wpa_s, MSG_INFO, WPA_EVENT_SCAN_FAILED "ret=%d%s",
 191                         ret, retry ? " retry=1" : "");
 192                 radio_work_done(work);
 193
 194                 if (retry) {
 195                         /* Restore scan_req since we will try to scan again */
 196                         wpa_s->scan_req = wpa_s->last_scan_req;
 197                         wpa_supplicant_req_scan(wpa_s, 1, 0);
 198                 }
 199                 return;
 200         }
 201
 202         os_get_reltime(&wpa_s->scan_trigger_time);
 203         wpa_s->scan_runs++;
 204         wpa_s->normal_scans++;
 205         wpa_s->own_scan_requested = 1;
 206         wpa_s->clear_driver_scan_cache = 0;
 207         wpa_s->scan_work = work;
 208 }
 209
 210
 211 /**
 212  * wpa_supplicant_trigger_scan - Request driver to start a scan
 213  * @wpa_s: Pointer to wpa_supplicant data
 214  * @params: Scan parameters
 215  * Returns: 0 on success, -1 on failure
 216  */
 217 int wpa_supplicant_trigger_scan(struct wpa_supplicant *wpa_s,
 218                                 struct wpa_driver_scan_params *params)
 219 {
 220         struct wpa_driver_scan_params *ctx;
 221
 222         if (wpa_s->scan_work) {
 223                 wpa_dbg(wpa_s, MSG_INFO, "Reject scan trigger since one is already pending");
 224                 return -1;
 225         }
 226
 227         ctx = wpa_scan_clone_params(params);
 228         if (ctx == NULL)
 229                 return -1;
 230
 231         if (radio_add_work(wpa_s, 0, "scan", 0, wpas_trigger_scan_cb, ctx) < 0)
 232         {
 233                 wpa_scan_free_params(ctx);
 234                 return -1;
 235         }
 236
 237         return 0;
 238 }
 239
 240
 241 static void
 242 wpa_supplicant_delayed_sched_scan_timeout(void *eloop_ctx, void *timeout_ctx)
 243 {
 244         struct wpa_supplicant *wpa_s = eloop_ctx;
 245
 246         wpa_dbg(wpa_s, MSG_DEBUG, "Starting delayed sched scan");
 247
 248         if (wpa_supplicant_req_sched_scan(wpa_s))
 249                 wpa_supplicant_req_scan(wpa_s, 0, 0);
 250 }
 251
 252
 253 static void
 254 wpa_supplicant_sched_scan_timeout(void *eloop_ctx, void *timeout_ctx)
 255 {
 256         struct wpa_supplicant *wpa_s = eloop_ctx;
 257
 258         wpa_dbg(wpa_s, MSG_DEBUG, "Sched scan timeout - stopping it");
 259
 260         wpa_s->sched_scan_timed_out = 1;
 261         wpa_supplicant_cancel_sched_scan(wpa_s);
 262 }
 263
 264
 265 int wpa_supplicant_start_sched_scan(struct wpa_supplicant *wpa_s,
 266                                     struct wpa_driver_scan_params *params,
 267                                     int interval)
 268 {
 269         int ret;
 270
 271         wpa_supplicant_notify_scanning(wpa_s, 1);
 272         ret = wpa_drv_sched_scan(wpa_s, params, interval * 1000);
 273         if (ret)
 274                 wpa_supplicant_notify_scanning(wpa_s, 0);
 275         else
 276                 wpa_s->sched_scanning = 1;
 277
 278         return ret;
 279 }
 280
 281
 282 int wpa_supplicant_stop_sched_scan(struct wpa_supplicant *wpa_s)
 283 {
 284         int ret;
 285
 286         ret = wpa_drv_stop_sched_scan(wpa_s);
 287         if (ret) {
 288                 wpa_dbg(wpa_s, MSG_DEBUG, "stopping sched_scan failed!");
 289                 /* TODO: what to do if stopping fails? */
 290                 return -1;
 291         }
 292
 293         return ret;
 294 }
 295
 296
 297 static struct wpa_driver_scan_filter *
 298 wpa_supplicant_build_filter_ssids(struct wpa_config *conf, size_t *num_ssids)
 299 {
 300         struct wpa_driver_scan_filter *ssids;
 301         struct wpa_ssid *ssid;
 302         size_t count;
 303
 304         *num_ssids = 0;
 305         if (!conf->filter_ssids)
 306                 return NULL;
 307
 308         for (count = 0, ssid = conf->ssid; ssid; ssid = ssid->next) {
 309                 if (ssid->ssid && ssid->ssid_len)
 310                         count++;
 311         }
 312         if (count == 0)
 313                 return NULL;
 314         ssids = os_calloc(count, sizeof(struct wpa_driver_scan_filter));
 315         if (ssids == NULL)
 316                 return NULL;
 317
 318         for (ssid = conf->ssid; ssid; ssid = ssid->next) {
 319                 if (!ssid->ssid || !ssid->ssid_len)
 320                         continue;
 321                 os_memcpy(ssids[*num_ssids].ssid, ssid->ssid, ssid->ssid_len);
 322                 ssids[*num_ssids].ssid_len = ssid->ssid_len;
 323                 (*num_ssids)++;
 324         }
 325
 326         return ssids;
 327 }
 328
 329
 330 static void wpa_supplicant_optimize_freqs(
 331         struct wpa_supplicant *wpa_s, struct wpa_driver_scan_params *params)
 332 {
 333 #ifdef CONFIG_P2P
 334         if (params->freqs == NULL && wpa_s->p2p_in_provisioning &&
 335             wpa_s->go_params) {
 336                 /* Optimize provisioning state scan based on GO information */
 337                 if (wpa_s->p2p_in_provisioning < 5 &&
 338                     wpa_s->go_params->freq > 0) {
 339                         wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only GO "
 340                                 "preferred frequency %d MHz",
 341                                 wpa_s->go_params->freq);
 342                         params->freqs = os_calloc(2, sizeof(int));
 343                         if (params->freqs)
 344                                 params->freqs[0] = wpa_s->go_params->freq;
 345                 } else if (wpa_s->p2p_in_provisioning < 8 &&
 346                            wpa_s->go_params->freq_list[0]) {
 347                         wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only common "
 348                                 "channels");
 349                         int_array_concat(&params->freqs,
 350                                          wpa_s->go_params->freq_list);
 351                         if (params->freqs)
 352                                 int_array_sort_unique(params->freqs);
 353                 }
 354                 wpa_s->p2p_in_provisioning++;
 355         }
 356
 357         if (params->freqs == NULL && wpa_s->p2p_in_invitation) {
 358                 /*
 359                  * Optimize scan based on GO information during persistent
 360                  * group reinvocation
 361                  */
 362                 if (wpa_s->p2p_in_invitation < 5 &&
 363                     wpa_s->p2p_invite_go_freq > 0) {
 364                         wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only GO preferred frequency %d MHz during invitation",
 365                                 wpa_s->p2p_invite_go_freq);
 366                         params->freqs = os_calloc(2, sizeof(int));
 367                         if (params->freqs)
 368                                 params->freqs[0] = wpa_s->p2p_invite_go_freq;
 369                 }
 370                 wpa_s->p2p_in_invitation++;
 371                 if (wpa_s->p2p_in_invitation > 20) {
 372                         /*
 373                          * This should not really happen since the variable is
 374                          * cleared on group removal, but if it does happen, make
 375                          * sure we do not get stuck in special invitation scan
 376                          * mode.
 377                          */
 378                         wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Clear p2p_in_invitation");
 379                         wpa_s->p2p_in_invitation = 0;
 380                 }
 381         }
 382 #endif /* CONFIG_P2P */
 383
 384 #ifdef CONFIG_WPS
 385         if (params->freqs == NULL && wpa_s->after_wps && wpa_s->wps_freq) {
 386                 /*
 387                  * Optimize post-provisioning scan based on channel used
 388                  * during provisioning.
 389                  */
 390                 wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Scan only frequency %u MHz "
 391                         "that was used during provisioning", wpa_s->wps_freq);
 392                 params->freqs = os_calloc(2, sizeof(int));
 393                 if (params->freqs)
 394                         params->freqs[0] = wpa_s->wps_freq;
 395                 wpa_s->after_wps--;
 396         } else if (wpa_s->after_wps)
 397                 wpa_s->after_wps--;
 398
 399         if (params->freqs == NULL && wpa_s->known_wps_freq && wpa_s->wps_freq)
 400         {
 401                 /* Optimize provisioning scan based on already known channel */
 402                 wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Scan only frequency %u MHz",
 403                         wpa_s->wps_freq);
 404                 params->freqs = os_calloc(2, sizeof(int));
 405                 if (params->freqs)
 406                         params->freqs[0] = wpa_s->wps_freq;
 407                 wpa_s->known_wps_freq = 0; /* only do this once */
 408         }
 409 #endif /* CONFIG_WPS */
 410 }
 411
 412
 413 #ifdef CONFIG_INTERWORKING
 414 static void wpas_add_interworking_elements(struct wpa_supplicant *wpa_s,
 415                                            struct wpabuf *buf)
 416 {
 417         if (wpa_s->conf->interworking == 0)
 418                 return;
 419
 420         wpabuf_put_u8(buf, WLAN_EID_EXT_CAPAB);
 421         wpabuf_put_u8(buf, 6);
 422         wpabuf_put_u8(buf, 0x00);
 423         wpabuf_put_u8(buf, 0x00);
 424         wpabuf_put_u8(buf, 0x00);
 425         wpabuf_put_u8(buf, 0x80); /* Bit 31 - Interworking */
 426         wpabuf_put_u8(buf, 0x00);
 427 #ifdef CONFIG_HS20
 428         wpabuf_put_u8(buf, 0x40); /* Bit 46 - WNM-Notification */
 429 #else /* CONFIG_HS20 */
 430         wpabuf_put_u8(buf, 0x00);
 431 #endif /* CONFIG_HS20 */
 432
 433         wpabuf_put_u8(buf, WLAN_EID_INTERWORKING);
 434         wpabuf_put_u8(buf, is_zero_ether_addr(wpa_s->conf->hessid) ? 1 :
 435                       1 + ETH_ALEN);
 436         wpabuf_put_u8(buf, wpa_s->conf->access_network_type);
 437         /* No Venue Info */
 438         if (!is_zero_ether_addr(wpa_s->conf->hessid))
 439                 wpabuf_put_data(buf, wpa_s->conf->hessid, ETH_ALEN);
 440 }
 441 #endif /* CONFIG_INTERWORKING */
 442
 443
 444 static struct wpabuf * wpa_supplicant_extra_ies(struct wpa_supplicant *wpa_s)
 445 {
 446         struct wpabuf *extra_ie = NULL;
 447 #ifdef CONFIG_WPS
 448         int wps = 0;
 449         enum wps_request_type req_type = WPS_REQ_ENROLLEE_INFO;
 450 #endif /* CONFIG_WPS */
 451
 452 #ifdef CONFIG_INTERWORKING
 453         if (wpa_s->conf->interworking &&
 454             wpabuf_resize(&extra_ie, 100) == 0)
 455                 wpas_add_interworking_elements(wpa_s, extra_ie);
 456 #endif /* CONFIG_INTERWORKING */
 457
 458 #ifdef CONFIG_WPS
 459         wps = wpas_wps_in_use(wpa_s, &req_type);
 460
 461         if (wps) {
 462                 struct wpabuf *wps_ie;
 463                 wps_ie = wps_build_probe_req_ie(wps == 2 ? DEV_PW_PUSHBUTTON :
 464                                                 DEV_PW_DEFAULT,
 465                                                 &wpa_s->wps->dev,
 466                                                 wpa_s->wps->uuid, req_type,
 467                                                 0, NULL);
 468                 if (wps_ie) {
 469                         if (wpabuf_resize(&extra_ie, wpabuf_len(wps_ie)) == 0)
 470                                 wpabuf_put_buf(extra_ie, wps_ie);
 471                         wpabuf_free(wps_ie);
 472                 }
 473         }
 474
 475 #ifdef CONFIG_P2P
 476         if (wps) {
 477                 size_t ielen = p2p_scan_ie_buf_len(wpa_s->global->p2p);
 478                 if (wpabuf_resize(&extra_ie, ielen) == 0)
 479                         wpas_p2p_scan_ie(wpa_s, extra_ie);
 480         }
 481 #endif /* CONFIG_P2P */
 482
 483         wpa_supplicant_mesh_add_scan_ie(wpa_s, &extra_ie);
 484
 485 #endif /* CONFIG_WPS */
 486
 487 #ifdef CONFIG_HS20
 488         if (wpa_s->conf->hs20 && wpabuf_resize(&extra_ie, 7) == 0)
 489                 wpas_hs20_add_indication(extra_ie, -1);
 490 #endif /* CONFIG_HS20 */
 491
 492         return extra_ie;
 493 }
 494
 495
 496 #ifdef CONFIG_P2P
 497
 498 /*
 499  * Check whether there are any enabled networks or credentials that could be
 500  * used for a non-P2P connection.
 501  */
 502 static int non_p2p_network_enabled(struct wpa_supplicant *wpa_s)
 503 {
 504         struct wpa_ssid *ssid;
 505
 506         for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
 507                 if (wpas_network_disabled(wpa_s, ssid))
 508                         continue;
 509                 if (!ssid->p2p_group)
 510                         return 1;
 511         }
 512
 513         if (wpa_s->conf->cred && wpa_s->conf->interworking &&
 514             wpa_s->conf->auto_interworking)
 515                 return 1;
 516
 517         return 0;
 518 }
 519
 520 #endif /* CONFIG_P2P */
 521
 522
 523 static struct hostapd_hw_modes * get_mode(struct hostapd_hw_modes *modes,
 524                                           u16 num_modes,
 525                                           enum hostapd_hw_mode mode)
 526 {
 527         u16 i;
 528
 529         for (i = 0; i < num_modes; i++) {
 530                 if (modes[i].mode == mode)
 531                         return &modes[i];
 532         }
 533
 534         return NULL;
 535 }
 536
 537
 538 static void wpa_setband_scan_freqs_list(struct wpa_supplicant *wpa_s,
 539                                         enum hostapd_hw_mode band,
 540                                         struct wpa_driver_scan_params *params)
 541 {
 542         /* Include only supported channels for the specified band */
 543         struct hostapd_hw_modes *mode;
 544         int count, i;
 545
 546         mode = get_mode(wpa_s->hw.modes, wpa_s->hw.num_modes, band);
 547         if (mode == NULL) {
 548                 /* No channels supported in this band - use empty list */
 549                 params->freqs = os_zalloc(sizeof(int));
 550                 return;
 551         }
 552
 553         params->freqs = os_calloc(mode->num_channels + 1, sizeof(int));
 554         if (params->freqs == NULL)
 555                 return;
 556         for (count = 0, i = 0; i < mode->num_channels; i++) {
 557                 if (mode->channels[i].flag & HOSTAPD_CHAN_DISABLED)
 558                         continue;
 559                 params->freqs[count++] = mode->channels[i].freq;
 560         }
 561 }
 562
 563
 564 static void wpa_setband_scan_freqs(struct wpa_supplicant *wpa_s,
 565                                    struct wpa_driver_scan_params *params)
 566 {
 567         if (wpa_s->hw.modes == NULL)
 568                 return; /* unknown what channels the driver supports */
 569         if (params->freqs)
 570                 return; /* already using a limited channel set */
 571         if (wpa_s->setband == WPA_SETBAND_5G)
 572                 wpa_setband_scan_freqs_list(wpa_s, HOSTAPD_MODE_IEEE80211A,
 573                                             params);
 574         else if (wpa_s->setband == WPA_SETBAND_2G)
 575                 wpa_setband_scan_freqs_list(wpa_s, HOSTAPD_MODE_IEEE80211G,
 576                                             params);
 577 }
 578
 579
 580 static void wpa_set_scan_ssids(struct wpa_supplicant *wpa_s,
 581                                struct wpa_driver_scan_params *params,
 582                                size_t max_ssids)
 583 {
 584         unsigned int i;
 585         struct wpa_ssid *ssid;
 586
 587         for (i = 0; i < wpa_s->scan_id_count; i++) {
 588                 unsigned int j;
 589
 590                 ssid = wpa_config_get_network(wpa_s->conf, wpa_s->scan_id[i]);
 591                 if (!ssid || !ssid->scan_ssid)
 592                         continue;
 593
 594                 for (j = 0; j < params->num_ssids; j++) {
 595                         if (params->ssids[j].ssid_len == ssid->ssid_len &&
 596                             params->ssids[j].ssid &&
 597                             os_memcmp(params->ssids[j].ssid, ssid->ssid,
 598                                       ssid->ssid_len) == 0)
 599                                 break;
 600                 }
 601                 if (j < params->num_ssids)
 602                         continue; /* already in the list */
 603
 604                 if (params->num_ssids + 1 > max_ssids) {
 605                         wpa_printf(MSG_DEBUG,
 606                                    "Over max scan SSIDs for manual request");
 607                         break;
 608                 }
 609
 610                 wpa_printf(MSG_DEBUG, "Scan SSID (manual request): %s",
 611                            wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
 612                 params->ssids[params->num_ssids].ssid = ssid->ssid;
 613                 params->ssids[params->num_ssids].ssid_len = ssid->ssid_len;
 614                 params->num_ssids++;
 615         }
 616
 617         wpa_s->scan_id_count = 0;
 618 }
 619
 620
 621 static void wpa_supplicant_scan(void *eloop_ctx, void *timeout_ctx)
 622 {
 623         struct wpa_supplicant *wpa_s = eloop_ctx;
 624         struct wpa_ssid *ssid;
 625         int ret, p2p_in_prog;
 626         struct wpabuf *extra_ie = NULL;
 627         struct wpa_driver_scan_params params;
 628         struct wpa_driver_scan_params *scan_params;
 629         size_t max_ssids;
 630
 631         if (wpa_s->pno || wpa_s->pno_sched_pending) {
 632                 wpa_dbg(wpa_s, MSG_DEBUG, "Skip scan - PNO is in progress");
 633                 return;
 634         }
 635
 636         if (wpa_s->wpa_state == WPA_INTERFACE_DISABLED) {
 637                 wpa_dbg(wpa_s, MSG_DEBUG, "Skip scan - interface disabled");
 638                 return;
 639         }
 640
 641         if (wpa_s->disconnected && wpa_s->scan_req == NORMAL_SCAN_REQ) {
 642                 wpa_dbg(wpa_s, MSG_DEBUG, "Disconnected - do not scan");
 643                 wpa_supplicant_set_state(wpa_s, WPA_DISCONNECTED);
 644                 return;
 645         }
 646
 647         if (wpa_s->scanning) {
 648                 /*
 649                  * If we are already in scanning state, we shall reschedule the
 650                  * the incoming scan request.
 651                  */
 652                 wpa_dbg(wpa_s, MSG_DEBUG, "Already scanning - Reschedule the incoming scan req");
 653                 wpa_supplicant_req_scan(wpa_s, 1, 0);
 654                 return;
 655         }
 656
 657         if (!wpa_supplicant_enabled_networks(wpa_s) &&
 658             wpa_s->scan_req == NORMAL_SCAN_REQ) {
 659                 wpa_dbg(wpa_s, MSG_DEBUG, "No enabled networks - do not scan");
 660                 wpa_supplicant_set_state(wpa_s, WPA_INACTIVE);
 661                 return;
 662         }
 663
 664         if (wpa_s->conf->ap_scan != 0 &&
 665             (wpa_s->drv_flags & WPA_DRIVER_FLAGS_WIRED)) {
 666                 wpa_dbg(wpa_s, MSG_DEBUG, "Using wired authentication - "
 667                         "overriding ap_scan configuration");
 668                 wpa_s->conf->ap_scan = 0;
 669                 wpas_notify_ap_scan_changed(wpa_s);
 670         }
 671
 672         if (wpa_s->conf->ap_scan == 0) {
 673                 wpa_supplicant_gen_assoc_event(wpa_s);
 674                 return;
 675         }
 676
 677         p2p_in_prog = wpas_p2p_in_progress(wpa_s);
 678         if (p2p_in_prog && p2p_in_prog != 2) {
 679                 wpa_dbg(wpa_s, MSG_DEBUG, "Delay station mode scan while P2P operation is in progress");
 680                 wpa_supplicant_req_scan(wpa_s, 5, 0);
 681                 return;
 682         }
 683
 684         if (wpa_s->conf->ap_scan == 2)
 685                 max_ssids = 1;
 686         else {
 687                 max_ssids = wpa_s->max_scan_ssids;
 688                 if (max_ssids > WPAS_MAX_SCAN_SSIDS)
 689                         max_ssids = WPAS_MAX_SCAN_SSIDS;
 690         }
 691
 692         wpa_s->last_scan_req = wpa_s->scan_req;
 693         wpa_s->scan_req = NORMAL_SCAN_REQ;
 694
 695         os_memset(&params, 0, sizeof(params));
 696
 697         wpa_s->scan_prev_wpa_state = wpa_s->wpa_state;
 698         if (wpa_s->wpa_state == WPA_DISCONNECTED ||
 699             wpa_s->wpa_state == WPA_INACTIVE)
 700                 wpa_supplicant_set_state(wpa_s, WPA_SCANNING);
 701
 702         /*
 703          * If autoscan has set its own scanning parameters
 704          */
 705         if (wpa_s->autoscan_params != NULL) {
 706                 scan_params = wpa_s->autoscan_params;
 707                 goto scan;
 708         }
 709
 710         if (wpa_s->last_scan_req != MANUAL_SCAN_REQ &&
 711             wpa_s->connect_without_scan) {
 712                 for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
 713                         if (ssid == wpa_s->connect_without_scan)
 714                                 break;
 715                 }
 716                 wpa_s->connect_without_scan = NULL;
 717                 if (ssid) {
 718                         wpa_printf(MSG_DEBUG, "Start a pre-selected network "
 719                                    "without scan step");
 720                         wpa_supplicant_associate(wpa_s, NULL, ssid);
 721                         return;
 722                 }
 723         }
 724
 725 #ifdef CONFIG_P2P
 726         if ((wpa_s->p2p_in_provisioning || wpa_s->show_group_started) &&
 727             wpa_s->go_params && !wpa_s->conf->passive_scan) {
 728                 wpa_printf(MSG_DEBUG, "P2P: Use specific SSID for scan during P2P group formation (p2p_in_provisioning=%d show_group_started=%d)",
 729                            wpa_s->p2p_in_provisioning,
 730                            wpa_s->show_group_started);
 731                 params.ssids[0].ssid = wpa_s->go_params->ssid;
 732                 params.ssids[0].ssid_len = wpa_s->go_params->ssid_len;
 733                 params.num_ssids = 1;
 734                 goto ssid_list_set;
 735         }
 736
 737         if (wpa_s->p2p_in_invitation) {
 738                 if (wpa_s->current_ssid) {
 739                         wpa_printf(MSG_DEBUG, "P2P: Use specific SSID for scan during invitation");
 740                         params.ssids[0].ssid = wpa_s->current_ssid->ssid;
 741                         params.ssids[0].ssid_len =
 742                                 wpa_s->current_ssid->ssid_len;
 743                         params.num_ssids = 1;
 744                 } else {
 745                         wpa_printf(MSG_DEBUG, "P2P: No specific SSID known for scan during invitation");
 746                 }
 747                 goto ssid_list_set;
 748         }
 749 #endif /* CONFIG_P2P */
 750
 751         /* Find the starting point from which to continue scanning */
 752         ssid = wpa_s->conf->ssid;
 753         if (wpa_s->prev_scan_ssid != WILDCARD_SSID_SCAN) {
 754                 while (ssid) {
 755                         if (ssid == wpa_s->prev_scan_ssid) {
 756                                 ssid = ssid->next;
 757                                 break;
 758                         }
 759                         ssid = ssid->next;
 760                 }
 761         }
 762
 763         if (wpa_s->last_scan_req != MANUAL_SCAN_REQ &&
 764             wpa_s->conf->ap_scan == 2) {
 765                 wpa_s->connect_without_scan = NULL;
 766                 wpa_s->prev_scan_wildcard = 0;
 767                 wpa_supplicant_assoc_try(wpa_s, ssid);
 768                 return;
 769         } else if (wpa_s->conf->ap_scan == 2) {
 770                 /*
 771                  * User-initiated scan request in ap_scan == 2; scan with
 772                  * wildcard SSID.
 773                  */
 774                 ssid = NULL;
 775         } else if (wpa_s->reattach && wpa_s->current_ssid != NULL) {
 776                 /*
 777                  * Perform single-channel single-SSID scan for
 778                  * reassociate-to-same-BSS operation.
 779                  */
 780                 /* Setup SSID */
 781                 ssid = wpa_s->current_ssid;
 782                 wpa_hexdump_ascii(MSG_DEBUG, "Scan SSID",
 783                                   ssid->ssid, ssid->ssid_len);
 784                 params.ssids[0].ssid = ssid->ssid;
 785                 params.ssids[0].ssid_len = ssid->ssid_len;
 786                 params.num_ssids = 1;
 787
 788                 /*
 789                  * Allocate memory for frequency array, allocate one extra
 790                  * slot for the zero-terminator.
 791                  */
 792                 params.freqs = os_malloc(sizeof(int) * 2);
 793                 if (params.freqs == NULL) {
 794                         wpa_dbg(wpa_s, MSG_ERROR, "Memory allocation failed");
 795                         return;
 796                 }
 797                 params.freqs[0] = wpa_s->assoc_freq;
 798                 params.freqs[1] = 0;
 799
 800                 /*
 801                  * Reset the reattach flag so that we fall back to full scan if
 802                  * this scan fails.
 803                  */
 804                 wpa_s->reattach = 0;
 805         } else {
 806                 struct wpa_ssid *start = ssid, *tssid;
 807                 int freqs_set = 0;
 808                 if (ssid == NULL && max_ssids > 1)
 809                         ssid = wpa_s->conf->ssid;
 810                 while (ssid) {
 811                         if (!wpas_network_disabled(wpa_s, ssid) &&
 812                             ssid->scan_ssid) {
 813                                 wpa_hexdump_ascii(MSG_DEBUG, "Scan SSID",
 814                                                   ssid->ssid, ssid->ssid_len);
 815                                 params.ssids[params.num_ssids].ssid =
 816                                         ssid->ssid;
 817                                 params.ssids[params.num_ssids].ssid_len =
 818                                         ssid->ssid_len;
 819                                 params.num_ssids++;
 820                                 if (params.num_ssids + 1 >= max_ssids)
 821                                         break;
 822                         }
 823                         ssid = ssid->next;
 824                         if (ssid == start)
 825                                 break;
 826                         if (ssid == NULL && max_ssids > 1 &&
 827                             start != wpa_s->conf->ssid)
 828                                 ssid = wpa_s->conf->ssid;
 829                 }
 830
 831                 if (wpa_s->scan_id_count &&
 832                     wpa_s->last_scan_req == MANUAL_SCAN_REQ)
 833                         wpa_set_scan_ssids(wpa_s, &params, max_ssids);
 834
 835                 for (tssid = wpa_s->conf->ssid;
 836                      wpa_s->last_scan_req != MANUAL_SCAN_REQ && tssid;
 837                      tssid = tssid->next) {
 838                         if (wpas_network_disabled(wpa_s, tssid))
 839                                 continue;
 840                         if ((params.freqs || !freqs_set) && tssid->scan_freq) {
 841                                 int_array_concat(&params.freqs,
 842                                                  tssid->scan_freq);
 843                         } else {
 844                                 os_free(params.freqs);
 845                                 params.freqs = NULL;
 846                         }
 847                         freqs_set = 1;
 848                 }
 849                 int_array_sort_unique(params.freqs);
 850         }
 851
 852         if (ssid && max_ssids == 1) {
 853                 /*
 854                  * If the driver is limited to 1 SSID at a time interleave
 855                  * wildcard SSID scans with specific SSID scans to avoid
 856                  * waiting a long time for a wildcard scan.
 857                  */
 858                 if (!wpa_s->prev_scan_wildcard) {
 859                         params.ssids[0].ssid = NULL;
 860                         params.ssids[0].ssid_len = 0;
 861                         wpa_s->prev_scan_wildcard = 1;
 862                         wpa_dbg(wpa_s, MSG_DEBUG, "Starting AP scan for "
 863                                 "wildcard SSID (Interleave with specific)");
 864                 } else {
 865                         wpa_s->prev_scan_ssid = ssid;
 866                         wpa_s->prev_scan_wildcard = 0;
 867                         wpa_dbg(wpa_s, MSG_DEBUG,
 868                                 "Starting AP scan for specific SSID: %s",
 869                                 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
 870                 }
 871         } else if (ssid) {
 872                 /* max_ssids > 1 */
 873
 874                 wpa_s->prev_scan_ssid = ssid;
 875                 wpa_dbg(wpa_s, MSG_DEBUG, "Include wildcard SSID in "
 876                         "the scan request");
 877                 params.num_ssids++;
 878         } else if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
 879                    wpa_s->manual_scan_passive && params.num_ssids == 0) {
 880                 wpa_dbg(wpa_s, MSG_DEBUG, "Use passive scan based on manual request");
 881         } else if (wpa_s->conf->passive_scan) {
 882                 wpa_dbg(wpa_s, MSG_DEBUG,
 883                         "Use passive scan based on configuration");
 884         } else {
 885                 wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
 886                 params.num_ssids++;
 887                 wpa_dbg(wpa_s, MSG_DEBUG, "Starting AP scan for wildcard "
 888                         "SSID");
 889         }
 890 #ifdef CONFIG_P2P
 891 ssid_list_set:
 892 #endif /* CONFIG_P2P */
 893
 894         wpa_supplicant_optimize_freqs(wpa_s, &params);
 895         extra_ie = wpa_supplicant_extra_ies(wpa_s);
 896
 897         if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
 898             wpa_s->manual_scan_only_new) {
 899                 wpa_printf(MSG_DEBUG,
 900                            "Request driver to clear scan cache due to manual only_new=1 scan");
 901                 params.only_new_results = 1;
 902         }
 903
 904         if (wpa_s->last_scan_req == MANUAL_SCAN_REQ && params.freqs == NULL &&
 905             wpa_s->manual_scan_freqs) {
 906                 wpa_dbg(wpa_s, MSG_DEBUG, "Limit manual scan to specified channels");
 907                 params.freqs = wpa_s->manual_scan_freqs;
 908                 wpa_s->manual_scan_freqs = NULL;
 909         }
 910
 911         if (params.freqs == NULL && wpa_s->next_scan_freqs) {
 912                 wpa_dbg(wpa_s, MSG_DEBUG, "Optimize scan based on previously "
 913                         "generated frequency list");
 914                 params.freqs = wpa_s->next_scan_freqs;
 915         } else
 916                 os_free(wpa_s->next_scan_freqs);
 917         wpa_s->next_scan_freqs = NULL;
 918         wpa_setband_scan_freqs(wpa_s, &params);
 919
 920         /* See if user specified frequencies. If so, scan only those. */
 921         if (wpa_s->conf->freq_list && !params.freqs) {
 922                 wpa_dbg(wpa_s, MSG_DEBUG,
 923                         "Optimize scan based on conf->freq_list");
 924                 int_array_concat(&params.freqs, wpa_s->conf->freq_list);
 925         }
 926
 927         /* Use current associated channel? */
 928         if (wpa_s->conf->scan_cur_freq && !params.freqs) {
 929                 unsigned int num = wpa_s->num_multichan_concurrent;
 930
 931                 params.freqs = os_calloc(num + 1, sizeof(int));
 932                 if (params.freqs) {
 933                         num = get_shared_radio_freqs(wpa_s, params.freqs, num);
 934                         if (num > 0) {
 935                                 wpa_dbg(wpa_s, MSG_DEBUG, "Scan only the "
 936                                         "current operating channels since "
 937                                         "scan_cur_freq is enabled");
 938                         } else {
 939                                 os_free(params.freqs);
 940                                 params.freqs = NULL;
 941                         }
 942                 }
 943         }
 944
 945         params.filter_ssids = wpa_supplicant_build_filter_ssids(
 946                 wpa_s->conf, &params.num_filter_ssids);
 947         if (extra_ie) {
 948                 params.extra_ies = wpabuf_head(extra_ie);
 949                 params.extra_ies_len = wpabuf_len(extra_ie);
 950         }
 951
 952 #ifdef CONFIG_P2P
 953         if (wpa_s->p2p_in_provisioning || wpa_s->p2p_in_invitation ||
 954             (wpa_s->show_group_started && wpa_s->go_params)) {
 955                 /*
 956                  * The interface may not yet be in P2P mode, so we have to
 957                  * explicitly request P2P probe to disable CCK rates.
 958                  */
 959                 params.p2p_probe = 1;
 960         }
 961 #endif /* CONFIG_P2P */
 962
 963         if (wpa_s->mac_addr_rand_enable & MAC_ADDR_RAND_SCAN) {
 964                 params.mac_addr_rand = 1;
 965                 if (wpa_s->mac_addr_scan) {
 966                         params.mac_addr = wpa_s->mac_addr_scan;
 967                         params.mac_addr_mask = wpa_s->mac_addr_scan + ETH_ALEN;
 968                 }
 969         }
 970
 971         scan_params = &params;
 972
 973 scan:
 974 #ifdef CONFIG_P2P
 975         /*
 976          * If the driver does not support multi-channel concurrency and a
 977          * virtual interface that shares the same radio with the wpa_s interface
 978          * is operating there may not be need to scan other channels apart from
 979          * the current operating channel on the other virtual interface. Filter
 980          * out other channels in case we are trying to find a connection for a
 981          * station interface when we are not configured to prefer station
 982          * connection and a concurrent operation is already in process.
 983          */
 984         if (wpa_s->scan_for_connection &&
 985             wpa_s->last_scan_req == NORMAL_SCAN_REQ &&
 986             !scan_params->freqs && !params.freqs &&
 987             wpas_is_p2p_prioritized(wpa_s) &&
 988             wpa_s->p2p_group_interface == NOT_P2P_GROUP_INTERFACE &&
 989             non_p2p_network_enabled(wpa_s)) {
 990                 unsigned int num = wpa_s->num_multichan_concurrent;
 991
 992                 params.freqs = os_calloc(num + 1, sizeof(int));
 993                 if (params.freqs) {
 994                         num = get_shared_radio_freqs(wpa_s, params.freqs, num);
 995                         if (num > 0 && num == wpa_s->num_multichan_concurrent) {
 996                                 wpa_dbg(wpa_s, MSG_DEBUG, "Scan only the current operating channels since all channels are already used");
 997                         } else {
 998                                 os_free(params.freqs);
 999                                 params.freqs = NULL;
1000                         }
1001                 }
1002         }
1003 #endif /* CONFIG_P2P */
1004
1005         ret = wpa_supplicant_trigger_scan(wpa_s, scan_params);
1006
1007         if (ret && wpa_s->last_scan_req == MANUAL_SCAN_REQ && params.freqs &&
1008             !wpa_s->manual_scan_freqs) {
1009                 /* Restore manual_scan_freqs for the next attempt */
1010                 wpa_s->manual_scan_freqs = params.freqs;
1011                 params.freqs = NULL;
1012         }
1013
1014         wpabuf_free(extra_ie);
1015         os_free(params.freqs);
1016         os_free(params.filter_ssids);
1017
1018         if (ret) {
1019                 wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate AP scan");
1020                 if (wpa_s->scan_prev_wpa_state != wpa_s->wpa_state)
1021                         wpa_supplicant_set_state(wpa_s,
1022                                                  wpa_s->scan_prev_wpa_state);
1023                 /* Restore scan_req since we will try to scan again */
1024                 wpa_s->scan_req = wpa_s->last_scan_req;
1025                 wpa_supplicant_req_scan(wpa_s, 1, 0);
1026         } else {
1027                 wpa_s->scan_for_connection = 0;
1028 #ifdef CONFIG_INTERWORKING
1029                 wpa_s->interworking_fast_assoc_tried = 0;
1030 #endif /* CONFIG_INTERWORKING */
1031         }
1032 }
1033
1034
1035 void wpa_supplicant_update_scan_int(struct wpa_supplicant *wpa_s, int sec)
1036 {
1037         struct os_reltime remaining, new_int;
1038         int cancelled;
1039
1040         cancelled = eloop_cancel_timeout_one(wpa_supplicant_scan, wpa_s, NULL,
1041                                              &remaining);
1042
1043         new_int.sec = sec;
1044         new_int.usec = 0;
1045         if (cancelled && os_reltime_before(&remaining, &new_int)) {
1046                 new_int.sec = remaining.sec;
1047                 new_int.usec = remaining.usec;
1048         }
1049
1050         if (cancelled) {
1051                 eloop_register_timeout(new_int.sec, new_int.usec,
1052                                        wpa_supplicant_scan, wpa_s, NULL);
1053         }
1054         wpa_s->scan_interval = sec;
1055 }
1056
1057
1058 /**
1059  * wpa_supplicant_req_scan - Schedule a scan for neighboring access points
1060  * @wpa_s: Pointer to wpa_supplicant data
1061  * @sec: Number of seconds after which to scan
1062  * @usec: Number of microseconds after which to scan
1063  *
1064  * This function is used to schedule a scan for neighboring access points after
1065  * the specified time.
1066  */
1067 void wpa_supplicant_req_scan(struct wpa_supplicant *wpa_s, int sec, int usec)
1068 {
1069         int res = eloop_deplete_timeout(sec, usec, wpa_supplicant_scan, wpa_s,
1070                                         NULL);
1071         if (res == 1) {
1072                 wpa_dbg(wpa_s, MSG_DEBUG, "Rescheduling scan request: %d.%06d sec",
1073                         sec, usec);
1074         } else if (res == 0) {
1075                 wpa_dbg(wpa_s, MSG_DEBUG, "Ignore new scan request for %d.%06d sec since an earlier request is scheduled to trigger sooner",
1076                         sec, usec);
1077         } else {
1078                 wpa_dbg(wpa_s, MSG_DEBUG, "Setting scan request: %d.%06d sec",
1079                         sec, usec);
1080                 eloop_register_timeout(sec, usec, wpa_supplicant_scan, wpa_s, NULL);
1081         }
1082 }
1083
1084
1085 /**
1086  * wpa_supplicant_delayed_sched_scan - Request a delayed scheduled scan
1087  * @wpa_s: Pointer to wpa_supplicant data
1088  * @sec: Number of seconds after which to scan
1089  * @usec: Number of microseconds after which to scan
1090  * Returns: 0 on success or -1 otherwise
1091  *
1092  * This function is used to schedule periodic scans for neighboring
1093  * access points after the specified time.
1094  */
1095 int wpa_supplicant_delayed_sched_scan(struct wpa_supplicant *wpa_s,
1096                                       int sec, int usec)
1097 {
1098         if (!wpa_s->sched_scan_supported)
1099                 return -1;
1100
1101         eloop_register_timeout(sec, usec,
1102                                wpa_supplicant_delayed_sched_scan_timeout,
1103                                wpa_s, NULL);
1104
1105         return 0;
1106 }
1107
1108
1109 /**
1110  * wpa_supplicant_req_sched_scan - Start a periodic scheduled scan
1111  * @wpa_s: Pointer to wpa_supplicant data
1112  * Returns: 0 is sched_scan was started or -1 otherwise
1113  *
1114  * This function is used to schedule periodic scans for neighboring
1115  * access points repeating the scan continuously.
1116  */
1117 int wpa_supplicant_req_sched_scan(struct wpa_supplicant *wpa_s)
1118 {
1119         struct wpa_driver_scan_params params;
1120         struct wpa_driver_scan_params *scan_params;
1121         enum wpa_states prev_state;
1122         struct wpa_ssid *ssid = NULL;
1123         struct wpabuf *extra_ie = NULL;
1124         int ret;
1125         unsigned int max_sched_scan_ssids;
1126         int wildcard = 0;
1127         int need_ssids;
1128
1129         if (!wpa_s->sched_scan_supported)
1130                 return -1;
1131
1132         if (wpa_s->max_sched_scan_ssids > WPAS_MAX_SCAN_SSIDS)
1133                 max_sched_scan_ssids = WPAS_MAX_SCAN_SSIDS;
1134         else
1135                 max_sched_scan_ssids = wpa_s->max_sched_scan_ssids;
1136         if (max_sched_scan_ssids < 1 || wpa_s->conf->disable_scan_offload)
1137                 return -1;
1138
1139         if (wpa_s->sched_scanning) {
1140                 wpa_dbg(wpa_s, MSG_DEBUG, "Already sched scanning");
1141                 return 0;
1142         }
1143
1144         need_ssids = 0;
1145         for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
1146                 if (!wpas_network_disabled(wpa_s, ssid) && !ssid->scan_ssid) {
1147                         /* Use wildcard SSID to find this network */
1148                         wildcard = 1;
1149                 } else if (!wpas_network_disabled(wpa_s, ssid) &&
1150                            ssid->ssid_len)
1151                         need_ssids++;
1152
1153 #ifdef CONFIG_WPS
1154                 if (!wpas_network_disabled(wpa_s, ssid) &&
1155                     ssid->key_mgmt == WPA_KEY_MGMT_WPS) {
1156                         /*
1157                          * Normal scan is more reliable and faster for WPS
1158                          * operations and since these are for short periods of
1159                          * time, the benefit of trying to use sched_scan would
1160                          * be limited.
1161                          */
1162                         wpa_dbg(wpa_s, MSG_DEBUG, "Use normal scan instead of "
1163                                 "sched_scan for WPS");
1164                         return -1;
1165                 }
1166 #endif /* CONFIG_WPS */
1167         }
1168         if (wildcard)
1169                 need_ssids++;
1170
1171         if (wpa_s->normal_scans < 3 &&
1172             (need_ssids <= wpa_s->max_scan_ssids ||
1173              wpa_s->max_scan_ssids >= (int) max_sched_scan_ssids)) {
1174                 /*
1175                  * When normal scan can speed up operations, use that for the
1176                  * first operations before starting the sched_scan to allow
1177                  * user space sleep more. We do this only if the normal scan
1178                  * has functionality that is suitable for this or if the
1179                  * sched_scan does not have better support for multiple SSIDs.
1180                  */
1181                 wpa_dbg(wpa_s, MSG_DEBUG, "Use normal scan instead of "
1182                         "sched_scan for initial scans (normal_scans=%d)",
1183                         wpa_s->normal_scans);
1184                 return -1;
1185         }
1186
1187         os_memset(&params, 0, sizeof(params));
1188
1189         /* If we can't allocate space for the filters, we just don't filter */
1190         params.filter_ssids = os_calloc(wpa_s->max_match_sets,
1191                                         sizeof(struct wpa_driver_scan_filter));
1192
1193         prev_state = wpa_s->wpa_state;
1194         if (wpa_s->wpa_state == WPA_DISCONNECTED ||
1195             wpa_s->wpa_state == WPA_INACTIVE)
1196                 wpa_supplicant_set_state(wpa_s, WPA_SCANNING);
1197
1198         if (wpa_s->autoscan_params != NULL) {
1199                 scan_params = wpa_s->autoscan_params;
1200                 goto scan;
1201         }
1202
1203         /* Find the starting point from which to continue scanning */
1204         ssid = wpa_s->conf->ssid;
1205         if (wpa_s->prev_sched_ssid) {
1206                 while (ssid) {
1207                         if (ssid == wpa_s->prev_sched_ssid) {
1208                                 ssid = ssid->next;
1209                                 break;
1210                         }
1211                         ssid = ssid->next;
1212                 }
1213         }
1214
1215         if (!ssid || !wpa_s->prev_sched_ssid) {
1216                 wpa_dbg(wpa_s, MSG_DEBUG, "Beginning of SSID list");
1217                 if (wpa_s->conf->sched_scan_interval)
1218                         wpa_s->sched_scan_interval =
1219                                 wpa_s->conf->sched_scan_interval;
1220                 if (wpa_s->sched_scan_interval == 0)
1221                         wpa_s->sched_scan_interval = 10;
1222                 wpa_s->sched_scan_timeout = max_sched_scan_ssids * 2;
1223                 wpa_s->first_sched_scan = 1;
1224                 ssid = wpa_s->conf->ssid;
1225                 wpa_s->prev_sched_ssid = ssid;
1226         }
1227
1228         if (wildcard) {
1229                 wpa_dbg(wpa_s, MSG_DEBUG, "Add wildcard SSID to sched_scan");
1230                 params.num_ssids++;
1231         }
1232
1233         while (ssid) {
1234                 if (wpas_network_disabled(wpa_s, ssid))
1235                         goto next;
1236
1237                 if (params.num_filter_ssids < wpa_s->max_match_sets &&
1238                     params.filter_ssids && ssid->ssid && ssid->ssid_len) {
1239                         wpa_dbg(wpa_s, MSG_DEBUG, "add to filter ssid: %s",
1240                                 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
1241                         os_memcpy(params.filter_ssids[params.num_filter_ssids].ssid,
1242                                   ssid->ssid, ssid->ssid_len);
1243                         params.filter_ssids[params.num_filter_ssids].ssid_len =
1244                                 ssid->ssid_len;
1245                         params.num_filter_ssids++;
1246                 } else if (params.filter_ssids && ssid->ssid && ssid->ssid_len)
1247                 {
1248                         wpa_dbg(wpa_s, MSG_DEBUG, "Not enough room for SSID "
1249                                 "filter for sched_scan - drop filter");
1250                         os_free(params.filter_ssids);
1251                         params.filter_ssids = NULL;
1252                         params.num_filter_ssids = 0;
1253                 }
1254
1255                 if (ssid->scan_ssid && ssid->ssid && ssid->ssid_len) {
1256                         if (params.num_ssids == max_sched_scan_ssids)
1257                                 break; /* only room for broadcast SSID */
1258                         wpa_dbg(wpa_s, MSG_DEBUG,
1259                                 "add to active scan ssid: %s",
1260                                 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
1261                         params.ssids[params.num_ssids].ssid =
1262                                 ssid->ssid;
1263                         params.ssids[params.num_ssids].ssid_len =
1264                                 ssid->ssid_len;
1265                         params.num_ssids++;
1266                         if (params.num_ssids >= max_sched_scan_ssids) {
1267                                 wpa_s->prev_sched_ssid = ssid;
1268                                 do {
1269                                         ssid = ssid->next;
1270                                 } while (ssid &&
1271                                          (wpas_network_disabled(wpa_s, ssid) ||
1272                                           !ssid->scan_ssid));
1273                                 break;
1274                         }
1275                 }
1276
1277         next:
1278                 wpa_s->prev_sched_ssid = ssid;
1279                 ssid = ssid->next;
1280         }
1281
1282         if (params.num_filter_ssids == 0) {
1283                 os_free(params.filter_ssids);
1284                 params.filter_ssids = NULL;
1285         }
1286
1287         extra_ie = wpa_supplicant_extra_ies(wpa_s);
1288         if (extra_ie) {
1289                 params.extra_ies = wpabuf_head(extra_ie);
1290                 params.extra_ies_len = wpabuf_len(extra_ie);
1291         }
1292
1293         if (wpa_s->conf->filter_rssi)
1294                 params.filter_rssi = wpa_s->conf->filter_rssi;
1295
1296         /* See if user specified frequencies. If so, scan only those. */
1297         if (wpa_s->conf->freq_list && !params.freqs) {
1298                 wpa_dbg(wpa_s, MSG_DEBUG,
1299                         "Optimize scan based on conf->freq_list");
1300                 int_array_concat(&params.freqs, wpa_s->conf->freq_list);
1301         }
1302
1303         scan_params = &params;
1304
1305 scan:
1306         if (ssid || !wpa_s->first_sched_scan) {
1307                 wpa_dbg(wpa_s, MSG_DEBUG,
1308                         "Starting sched scan: interval %d timeout %d",
1309                         wpa_s->sched_scan_interval, wpa_s->sched_scan_timeout);
1310         } else {
1311                 wpa_dbg(wpa_s, MSG_DEBUG,
1312                         "Starting sched scan: interval %d (no timeout)",
1313                         wpa_s->sched_scan_interval);
1314         }
1315
1316         wpa_setband_scan_freqs(wpa_s, scan_params);
1317
1318         if (wpa_s->mac_addr_rand_enable & MAC_ADDR_RAND_SCHED_SCAN) {
1319                 params.mac_addr_rand = 1;
1320                 if (wpa_s->mac_addr_sched_scan) {
1321                         params.mac_addr = wpa_s->mac_addr_sched_scan;
1322                         params.mac_addr_mask = wpa_s->mac_addr_sched_scan +
1323                                 ETH_ALEN;
1324                 }
1325         }
1326
1327         ret = wpa_supplicant_start_sched_scan(wpa_s, scan_params,
1328                                               wpa_s->sched_scan_interval);
1329         wpabuf_free(extra_ie);
1330         os_free(params.filter_ssids);
1331         if (ret) {
1332                 wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate sched scan");
1333                 if (prev_state != wpa_s->wpa_state)
1334                         wpa_supplicant_set_state(wpa_s, prev_state);
1335                 return ret;
1336         }
1337
1338         /* If we have more SSIDs to scan, add a timeout so we scan them too */
1339         if (ssid || !wpa_s->first_sched_scan) {
1340                 wpa_s->sched_scan_timed_out = 0;
1341                 eloop_register_timeout(wpa_s->sched_scan_timeout, 0,
1342                                        wpa_supplicant_sched_scan_timeout,
1343                                        wpa_s, NULL);
1344                 wpa_s->first_sched_scan = 0;
1345                 wpa_s->sched_scan_timeout /= 2;
1346                 wpa_s->sched_scan_interval *= 2;
1347                 if (wpa_s->sched_scan_timeout < wpa_s->sched_scan_interval) {
1348                         wpa_s->sched_scan_interval = 10;
1349                         wpa_s->sched_scan_timeout = max_sched_scan_ssids * 2;
1350                 }
1351         }
1352
1353         /* If there is no more ssids, start next time from the beginning */
1354         if (!ssid)
1355                 wpa_s->prev_sched_ssid = NULL;
1356
1357         return 0;
1358 }
1359
1360
1361 /**
1362  * wpa_supplicant_cancel_scan - Cancel a scheduled scan request
1363  * @wpa_s: Pointer to wpa_supplicant data
1364  *
1365  * This function is used to cancel a scan request scheduled with
1366  * wpa_supplicant_req_scan().
1367  */
1368 void wpa_supplicant_cancel_scan(struct wpa_supplicant *wpa_s)
1369 {
1370         wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling scan request");
1371         eloop_cancel_timeout(wpa_supplicant_scan, wpa_s, NULL);
1372 }
1373
1374
1375 /**
1376  * wpa_supplicant_cancel_delayed_sched_scan - Stop a delayed scheduled scan
1377  * @wpa_s: Pointer to wpa_supplicant data
1378  *
1379  * This function is used to stop a delayed scheduled scan.
1380  */
1381 void wpa_supplicant_cancel_delayed_sched_scan(struct wpa_supplicant *wpa_s)
1382 {
1383         if (!wpa_s->sched_scan_supported)
1384                 return;
1385
1386         wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling delayed sched scan");
1387         eloop_cancel_timeout(wpa_supplicant_delayed_sched_scan_timeout,
1388                              wpa_s, NULL);
1389 }
1390
1391
1392 /**
1393  * wpa_supplicant_cancel_sched_scan - Stop running scheduled scans
1394  * @wpa_s: Pointer to wpa_supplicant data
1395  *
1396  * This function is used to stop a periodic scheduled scan.
1397  */
1398 void wpa_supplicant_cancel_sched_scan(struct wpa_supplicant *wpa_s)
1399 {
1400         if (!wpa_s->sched_scanning)
1401                 return;
1402
1403         wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling sched scan");
1404         eloop_cancel_timeout(wpa_supplicant_sched_scan_timeout, wpa_s, NULL);
1405         wpa_supplicant_stop_sched_scan(wpa_s);
1406 }
1407
1408
1409 /**
1410  * wpa_supplicant_notify_scanning - Indicate possible scan state change
1411  * @wpa_s: Pointer to wpa_supplicant data
1412  * @scanning: Whether scanning is currently in progress
1413  *
1414  * This function is to generate scanning notifycations. It is called whenever
1415  * there may have been a change in scanning (scan started, completed, stopped).
1416  * wpas_notify_scanning() is called whenever the scanning state changed from the
1417  * previously notified state.
1418  */
1419 void wpa_supplicant_notify_scanning(struct wpa_supplicant *wpa_s,
1420                                     int scanning)
1421 {
1422         if (wpa_s->scanning != scanning) {
1423                 wpa_s->scanning = scanning;
1424                 wpas_notify_scanning(wpa_s);
1425         }
1426 }
1427
1428
1429 static int wpa_scan_get_max_rate(const struct wpa_scan_res *res)
1430 {
1431         int rate = 0;
1432         const u8 *ie;
1433         int i;
1434
1435         ie = wpa_scan_get_ie(res, WLAN_EID_SUPP_RATES);
1436         for (i = 0; ie && i < ie[1]; i++) {
1437                 if ((ie[i + 2] & 0x7f) > rate)
1438                         rate = ie[i + 2] & 0x7f;
1439         }
1440
1441         ie = wpa_scan_get_ie(res, WLAN_EID_EXT_SUPP_RATES);
1442         for (i = 0; ie && i < ie[1]; i++) {
1443                 if ((ie[i + 2] & 0x7f) > rate)
1444                         rate = ie[i + 2] & 0x7f;
1445         }
1446
1447         return rate;
1448 }
1449
1450
1451 /**
1452  * wpa_scan_get_ie - Fetch a specified information element from a scan result
1453  * @res: Scan result entry
1454  * @ie: Information element identitifier (WLAN_EID_*)
1455  * Returns: Pointer to the information element (id field) or %NULL if not found
1456  *
1457  * This function returns the first matching information element in the scan
1458  * result.
1459  */
1460 const u8 * wpa_scan_get_ie(const struct wpa_scan_res *res, u8 ie)
1461 {
1462         const u8 *end, *pos;
1463
1464         pos = (const u8 *) (res + 1);
1465         end = pos + res->ie_len;
1466
1467         while (pos + 1 < end) {
1468                 if (pos + 2 + pos[1] > end)
1469                         break;
1470                 if (pos[0] == ie)
1471                         return pos;
1472                 pos += 2 + pos[1];
1473         }
1474
1475         return NULL;
1476 }
1477
1478
1479 /**
1480  * wpa_scan_get_vendor_ie - Fetch vendor information element from a scan result
1481  * @res: Scan result entry
1482  * @vendor_type: Vendor type (four octets starting the IE payload)
1483  * Returns: Pointer to the information element (id field) or %NULL if not found
1484  *
1485  * This function returns the first matching information element in the scan
1486  * result.
1487  */
1488 const u8 * wpa_scan_get_vendor_ie(const struct wpa_scan_res *res,
1489                                   u32 vendor_type)
1490 {
1491         const u8 *end, *pos;
1492
1493         pos = (const u8 *) (res + 1);
1494         end = pos + res->ie_len;
1495
1496         while (pos + 1 < end) {
1497                 if (pos + 2 + pos[1] > end)
1498                         break;
1499                 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1500                     vendor_type == WPA_GET_BE32(&pos[2]))
1501                         return pos;
1502                 pos += 2 + pos[1];
1503         }
1504
1505         return NULL;
1506 }
1507
1508
1509 /**
1510  * wpa_scan_get_vendor_ie_beacon - Fetch vendor information from a scan result
1511  * @res: Scan result entry
1512  * @vendor_type: Vendor type (four octets starting the IE payload)
1513  * Returns: Pointer to the information element (id field) or %NULL if not found
1514  *
1515  * This function returns the first matching information element in the scan
1516  * result.
1517  *
1518  * This function is like wpa_scan_get_vendor_ie(), but uses IE buffer only
1519  * from Beacon frames instead of either Beacon or Probe Response frames.
1520  */
1521 const u8 * wpa_scan_get_vendor_ie_beacon(const struct wpa_scan_res *res,
1522                                          u32 vendor_type)
1523 {
1524         const u8 *end, *pos;
1525
1526         if (res->beacon_ie_len == 0)
1527                 return NULL;
1528
1529         pos = (const u8 *) (res + 1);
1530         pos += res->ie_len;
1531         end = pos + res->beacon_ie_len;
1532
1533         while (pos + 1 < end) {
1534                 if (pos + 2 + pos[1] > end)
1535                         break;
1536                 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1537                     vendor_type == WPA_GET_BE32(&pos[2]))
1538                         return pos;
1539                 pos += 2 + pos[1];
1540         }
1541
1542         return NULL;
1543 }
1544
1545
1546 /**
1547  * wpa_scan_get_vendor_ie_multi - Fetch vendor IE data from a scan result
1548  * @res: Scan result entry
1549  * @vendor_type: Vendor type (four octets starting the IE payload)
1550  * Returns: Pointer to the information element payload or %NULL if not found
1551  *
1552  * This function returns concatenated payload of possibly fragmented vendor
1553  * specific information elements in the scan result. The caller is responsible
1554  * for freeing the returned buffer.
1555  */
1556 struct wpabuf * wpa_scan_get_vendor_ie_multi(const struct wpa_scan_res *res,
1557                                              u32 vendor_type)
1558 {
1559         struct wpabuf *buf;
1560         const u8 *end, *pos;
1561
1562         buf = wpabuf_alloc(res->ie_len);
1563         if (buf == NULL)
1564                 return NULL;
1565
1566         pos = (const u8 *) (res + 1);
1567         end = pos + res->ie_len;
1568
1569         while (pos + 1 < end) {
1570                 if (pos + 2 + pos[1] > end)
1571                         break;
1572                 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1573                     vendor_type == WPA_GET_BE32(&pos[2]))
1574                         wpabuf_put_data(buf, pos + 2 + 4, pos[1] - 4);
1575                 pos += 2 + pos[1];
1576         }
1577
1578         if (wpabuf_len(buf) == 0) {
1579                 wpabuf_free(buf);
1580                 buf = NULL;
1581         }
1582
1583         return buf;
1584 }
1585
1586
1587 /*
1588  * Channels with a great SNR can operate at full rate. What is a great SNR?
1589  * This doc https://supportforums.cisco.com/docs/DOC-12954 says, "the general
1590  * rule of thumb is that any SNR above 20 is good." This one
1591  * http://www.cisco.com/en/US/tech/tk722/tk809/technologies_q_and_a_item09186a00805e9a96.shtml#qa23
1592  * recommends 25 as a minimum SNR for 54 Mbps data rate. 30 is chosen here as a
1593  * conservative value.
1594  */
1595 #define GREAT_SNR 30
1596
1597 #define IS_5GHZ(n) (n > 4000)
1598
1599 /* Compare function for sorting scan results. Return >0 if @b is considered
1600  * better. */
1601 static int wpa_scan_result_compar(const void *a, const void *b)
1602 {
1603 #define MIN(a,b) a < b ? a : b
1604         struct wpa_scan_res **_wa = (void *) a;
1605         struct wpa_scan_res **_wb = (void *) b;
1606         struct wpa_scan_res *wa = *_wa;
1607         struct wpa_scan_res *wb = *_wb;
1608         int wpa_a, wpa_b, maxrate_a, maxrate_b;
1609         int snr_a, snr_b;
1610
1611         /* WPA/WPA2 support preferred */
1612         wpa_a = wpa_scan_get_vendor_ie(wa, WPA_IE_VENDOR_TYPE) != NULL ||
1613                 wpa_scan_get_ie(wa, WLAN_EID_RSN) != NULL;
1614         wpa_b = wpa_scan_get_vendor_ie(wb, WPA_IE_VENDOR_TYPE) != NULL ||
1615                 wpa_scan_get_ie(wb, WLAN_EID_RSN) != NULL;
1616
1617         if (wpa_b && !wpa_a)
1618                 return 1;
1619         if (!wpa_b && wpa_a)
1620                 return -1;
1621
1622         /* privacy support preferred */
1623         if ((wa->caps & IEEE80211_CAP_PRIVACY) == 0 &&
1624             (wb->caps & IEEE80211_CAP_PRIVACY))
1625                 return 1;
1626         if ((wa->caps & IEEE80211_CAP_PRIVACY) &&
1627             (wb->caps & IEEE80211_CAP_PRIVACY) == 0)
1628                 return -1;
1629
1630         if (wa->flags & wb->flags & WPA_SCAN_LEVEL_DBM) {
1631                 snr_a = MIN(wa->level - wa->noise, GREAT_SNR);
1632                 snr_b = MIN(wb->level - wb->noise, GREAT_SNR);
1633         } else {
1634                 /* Level is not in dBm, so we can't calculate
1635                  * SNR. Just use raw level (units unknown). */
1636                 snr_a = wa->level;
1637                 snr_b = wb->level;
1638         }
1639
1640         /* if SNR is close, decide by max rate or frequency band */
1641         if ((snr_a && snr_b && abs(snr_b - snr_a) < 5) ||
1642             (wa->qual && wb->qual && abs(wb->qual - wa->qual) < 10)) {
1643                 maxrate_a = wpa_scan_get_max_rate(wa);
1644                 maxrate_b = wpa_scan_get_max_rate(wb);
1645                 if (maxrate_a != maxrate_b)
1646                         return maxrate_b - maxrate_a;
1647                 if (IS_5GHZ(wa->freq) ^ IS_5GHZ(wb->freq))
1648                         return IS_5GHZ(wa->freq) ? -1 : 1;
1649         }
1650
1651         /* all things being equal, use SNR; if SNRs are
1652          * identical, use quality values since some drivers may only report
1653          * that value and leave the signal level zero */
1654         if (snr_b == snr_a)
1655                 return wb->qual - wa->qual;
1656         return snr_b - snr_a;
1657 #undef MIN
1658 }
1659
1660
1661 #ifdef CONFIG_WPS
1662 /* Compare function for sorting scan results when searching a WPS AP for
1663  * provisioning. Return >0 if @b is considered better. */
1664 static int wpa_scan_result_wps_compar(const void *a, const void *b)
1665 {
1666         struct wpa_scan_res **_wa = (void *) a;
1667         struct wpa_scan_res **_wb = (void *) b;
1668         struct wpa_scan_res *wa = *_wa;
1669         struct wpa_scan_res *wb = *_wb;
1670         int uses_wps_a, uses_wps_b;
1671         struct wpabuf *wps_a, *wps_b;
1672         int res;
1673
1674         /* Optimization - check WPS IE existence before allocated memory and
1675          * doing full reassembly. */
1676         uses_wps_a = wpa_scan_get_vendor_ie(wa, WPS_IE_VENDOR_TYPE) != NULL;
1677         uses_wps_b = wpa_scan_get_vendor_ie(wb, WPS_IE_VENDOR_TYPE) != NULL;
1678         if (uses_wps_a && !uses_wps_b)
1679                 return -1;
1680         if (!uses_wps_a && uses_wps_b)
1681                 return 1;
1682
1683         if (uses_wps_a && uses_wps_b) {
1684                 wps_a = wpa_scan_get_vendor_ie_multi(wa, WPS_IE_VENDOR_TYPE);
1685                 wps_b = wpa_scan_get_vendor_ie_multi(wb, WPS_IE_VENDOR_TYPE);
1686                 res = wps_ap_priority_compar(wps_a, wps_b);
1687                 wpabuf_free(wps_a);
1688                 wpabuf_free(wps_b);
1689                 if (res)
1690                         return res;
1691         }
1692
1693         /*
1694          * Do not use current AP security policy as a sorting criteria during
1695          * WPS provisioning step since the AP may get reconfigured at the
1696          * completion of provisioning.
1697          */
1698
1699         /* all things being equal, use signal level; if signal levels are
1700          * identical, use quality values since some drivers may only report
1701          * that value and leave the signal level zero */
1702         if (wb->level == wa->level)
1703                 return wb->qual - wa->qual;
1704         return wb->level - wa->level;
1705 }
1706 #endif /* CONFIG_WPS */
1707
1708
1709 static void dump_scan_res(struct wpa_scan_results *scan_res)
1710 {
1711 #ifndef CONFIG_NO_STDOUT_DEBUG
1712         size_t i;
1713
1714         if (scan_res->res == NULL || scan_res->num == 0)
1715                 return;
1716
1717         wpa_printf(MSG_EXCESSIVE, "Sorted scan results");
1718
1719         for (i = 0; i < scan_res->num; i++) {
1720                 struct wpa_scan_res *r = scan_res->res[i];
1721                 u8 *pos;
1722                 if (r->flags & WPA_SCAN_LEVEL_DBM) {
1723                         int snr = r->level - r->noise;
1724                         int noise_valid = !(r->flags & WPA_SCAN_NOISE_INVALID);
1725
1726                         wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d "
1727                                    "noise=%d%s level=%d snr=%d%s flags=0x%x age=%u",
1728                                    MAC2STR(r->bssid), r->freq, r->qual,
1729                                    r->noise, noise_valid ? "" : "~", r->level,
1730                                    snr, snr >= GREAT_SNR ? "*" : "", r->flags,
1731                                    r->age);
1732                 } else {
1733                         wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d "
1734                                    "noise=%d level=%d flags=0x%x age=%u",
1735                                    MAC2STR(r->bssid), r->freq, r->qual,
1736                                    r->noise, r->level, r->flags, r->age);
1737                 }
1738                 pos = (u8 *) (r + 1);
1739                 if (r->ie_len)
1740                         wpa_hexdump(MSG_EXCESSIVE, "IEs", pos, r->ie_len);
1741                 pos += r->ie_len;
1742                 if (r->beacon_ie_len)
1743                         wpa_hexdump(MSG_EXCESSIVE, "Beacon IEs",
1744                                     pos, r->beacon_ie_len);
1745         }
1746 #endif /* CONFIG_NO_STDOUT_DEBUG */
1747 }
1748
1749
1750 /**
1751  * wpa_supplicant_filter_bssid_match - Is the specified BSSID allowed
1752  * @wpa_s: Pointer to wpa_supplicant data
1753  * @bssid: BSSID to check
1754  * Returns: 0 if the BSSID is filtered or 1 if not
1755  *
1756  * This function is used to filter out specific BSSIDs from scan reslts mainly
1757  * for testing purposes (SET bssid_filter ctrl_iface command).
1758  */
1759 int wpa_supplicant_filter_bssid_match(struct wpa_supplicant *wpa_s,
1760                                       const u8 *bssid)
1761 {
1762         size_t i;
1763
1764         if (wpa_s->bssid_filter == NULL)
1765                 return 1;
1766
1767         for (i = 0; i < wpa_s->bssid_filter_count; i++) {
1768                 if (os_memcmp(wpa_s->bssid_filter + i * ETH_ALEN, bssid,
1769                               ETH_ALEN) == 0)
1770                         return 1;
1771         }
1772
1773         return 0;
1774 }
1775
1776
1777 static void filter_scan_res(struct wpa_supplicant *wpa_s,
1778                             struct wpa_scan_results *res)
1779 {
1780         size_t i, j;
1781
1782         if (wpa_s->bssid_filter == NULL)
1783                 return;
1784
1785         for (i = 0, j = 0; i < res->num; i++) {
1786                 if (wpa_supplicant_filter_bssid_match(wpa_s,
1787                                                       res->res[i]->bssid)) {
1788                         res->res[j++] = res->res[i];
1789                 } else {
1790                         os_free(res->res[i]);
1791                         res->res[i] = NULL;
1792                 }
1793         }
1794
1795         if (res->num != j) {
1796                 wpa_printf(MSG_DEBUG, "Filtered out %d scan results",
1797                            (int) (res->num - j));
1798                 res->num = j;
1799         }
1800 }
1801
1802
1803 /*
1804  * Noise floor values to use when we have signal strength
1805  * measurements, but no noise floor measurments. These values were
1806  * measured in an office environment with many APs.
1807  */
1808 #define DEFAULT_NOISE_FLOOR_2GHZ (-89)
1809 #define DEFAULT_NOISE_FLOOR_5GHZ (-92)
1810
1811 /**
1812  * wpa_supplicant_get_scan_results - Get scan results
1813  * @wpa_s: Pointer to wpa_supplicant data
1814  * @info: Information about what was scanned or %NULL if not available
1815  * @new_scan: Whether a new scan was performed
1816  * Returns: Scan results, %NULL on failure
1817  *
1818  * This function request the current scan results from the driver and updates
1819  * the local BSS list wpa_s->bss. The caller is responsible for freeing the
1820  * results with wpa_scan_results_free().
1821  */
1822 struct wpa_scan_results *
1823 wpa_supplicant_get_scan_results(struct wpa_supplicant *wpa_s,
1824                                 struct scan_info *info, int new_scan)
1825 {
1826         struct wpa_scan_results *scan_res;
1827         size_t i;
1828         int (*compar)(const void *, const void *) = wpa_scan_result_compar;
1829
1830         scan_res = wpa_drv_get_scan_results2(wpa_s);
1831         if (scan_res == NULL) {
1832                 wpa_dbg(wpa_s, MSG_DEBUG, "Failed to get scan results");
1833                 return NULL;
1834         }
1835         if (scan_res->fetch_time.sec == 0) {
1836                 /*
1837                  * Make sure we have a valid timestamp if the driver wrapper
1838                  * does not set this.
1839                  */
1840                 os_get_reltime(&scan_res->fetch_time);
1841         }
1842         filter_scan_res(wpa_s, scan_res);
1843
1844         for (i = 0; i < scan_res->num; i++) {
1845                 struct wpa_scan_res *scan_res_item = scan_res->res[i];
1846
1847                 if (scan_res_item->flags & WPA_SCAN_NOISE_INVALID) {
1848                         scan_res_item->noise =
1849                                 IS_5GHZ(scan_res_item->freq) ?
1850                                 DEFAULT_NOISE_FLOOR_5GHZ :
1851                                 DEFAULT_NOISE_FLOOR_2GHZ;
1852                 }
1853         }
1854
1855 #ifdef CONFIG_WPS
1856         if (wpas_wps_searching(wpa_s)) {
1857                 wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Order scan results with WPS "
1858                         "provisioning rules");
1859                 compar = wpa_scan_result_wps_compar;
1860         }
1861 #endif /* CONFIG_WPS */
1862
1863         qsort(scan_res->res, scan_res->num, sizeof(struct wpa_scan_res *),
1864               compar);
1865         dump_scan_res(scan_res);
1866
1867         wpa_bss_update_start(wpa_s);
1868         for (i = 0; i < scan_res->num; i++)
1869                 wpa_bss_update_scan_res(wpa_s, scan_res->res[i],
1870                                         &scan_res->fetch_time);
1871         wpa_bss_update_end(wpa_s, info, new_scan);
1872
1873         return scan_res;
1874 }
1875
1876
1877 /**
1878  * wpa_supplicant_update_scan_results - Update scan results from the driver
1879  * @wpa_s: Pointer to wpa_supplicant data
1880  * Returns: 0 on success, -1 on failure
1881  *
1882  * This function updates the BSS table within wpa_supplicant based on the
1883  * currently available scan results from the driver without requesting a new
1884  * scan. This is used in cases where the driver indicates an association
1885  * (including roaming within ESS) and wpa_supplicant does not yet have the
1886  * needed information to complete the connection (e.g., to perform validation
1887  * steps in 4-way handshake).
1888  */
1889 int wpa_supplicant_update_scan_results(struct wpa_supplicant *wpa_s)
1890 {
1891         struct wpa_scan_results *scan_res;
1892         scan_res = wpa_supplicant_get_scan_results(wpa_s, NULL, 0);
1893         if (scan_res == NULL)
1894                 return -1;
1895         wpa_scan_results_free(scan_res);
1896
1897         return 0;
1898 }
1899
1900
1901 /**
1902  * scan_only_handler - Reports scan results
1903  */
1904 void scan_only_handler(struct wpa_supplicant *wpa_s,
1905                        struct wpa_scan_results *scan_res)
1906 {
1907         wpa_dbg(wpa_s, MSG_DEBUG, "Scan-only results received");
1908         if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
1909             wpa_s->manual_scan_use_id && wpa_s->own_scan_running) {
1910                 wpa_msg_ctrl(wpa_s, MSG_INFO, WPA_EVENT_SCAN_RESULTS "id=%u",
1911                              wpa_s->manual_scan_id);
1912                 wpa_s->manual_scan_use_id = 0;
1913         } else {
1914                 wpa_msg_ctrl(wpa_s, MSG_INFO, WPA_EVENT_SCAN_RESULTS);
1915         }
1916         wpas_notify_scan_results(wpa_s);
1917         wpas_notify_scan_done(wpa_s, 1);
1918         if (wpa_s->scan_work) {
1919                 struct wpa_radio_work *work = wpa_s->scan_work;
1920                 wpa_s->scan_work = NULL;
1921                 radio_work_done(work);
1922         }
1923 }
1924
1925
1926 int wpas_scan_scheduled(struct wpa_supplicant *wpa_s)
1927 {
1928         return eloop_is_timeout_registered(wpa_supplicant_scan, wpa_s, NULL);
1929 }
1930
1931
1932 struct wpa_driver_scan_params *
1933 wpa_scan_clone_params(const struct wpa_driver_scan_params *src)
1934 {
1935         struct wpa_driver_scan_params *params;
1936         size_t i;
1937         u8 *n;
1938
1939         params = os_zalloc(sizeof(*params));
1940         if (params == NULL)
1941                 return NULL;
1942
1943         for (i = 0; i < src->num_ssids; i++) {
1944                 if (src->ssids[i].ssid) {
1945                         n = os_malloc(src->ssids[i].ssid_len);
1946                         if (n == NULL)
1947                                 goto failed;
1948                         os_memcpy(n, src->ssids[i].ssid,
1949                                   src->ssids[i].ssid_len);
1950                         params->ssids[i].ssid = n;
1951                         params->ssids[i].ssid_len = src->ssids[i].ssid_len;
1952                 }
1953         }
1954         params->num_ssids = src->num_ssids;
1955
1956         if (src->extra_ies) {
1957                 n = os_malloc(src->extra_ies_len);
1958                 if (n == NULL)
1959                         goto failed;
1960                 os_memcpy(n, src->extra_ies, src->extra_ies_len);
1961                 params->extra_ies = n;
1962                 params->extra_ies_len = src->extra_ies_len;
1963         }
1964
1965         if (src->freqs) {
1966                 int len = int_array_len(src->freqs);
1967                 params->freqs = os_malloc((len + 1) * sizeof(int));
1968                 if (params->freqs == NULL)
1969                         goto failed;
1970                 os_memcpy(params->freqs, src->freqs, (len + 1) * sizeof(int));
1971         }
1972
1973         if (src->filter_ssids) {
1974                 params->filter_ssids = os_malloc(sizeof(*params->filter_ssids) *
1975                                                  src->num_filter_ssids);
1976                 if (params->filter_ssids == NULL)
1977                         goto failed;
1978                 os_memcpy(params->filter_ssids, src->filter_ssids,
1979                           sizeof(*params->filter_ssids) *
1980                           src->num_filter_ssids);
1981                 params->num_filter_ssids = src->num_filter_ssids;
1982         }
1983
1984         params->filter_rssi = src->filter_rssi;
1985         params->p2p_probe = src->p2p_probe;
1986         params->only_new_results = src->only_new_results;
1987         params->low_priority = src->low_priority;
1988
1989         if (src->mac_addr_rand) {
1990                 params->mac_addr_rand = src->mac_addr_rand;
1991
1992                 if (src->mac_addr && src->mac_addr_mask) {
1993                         u8 *mac_addr;
1994
1995                         mac_addr = os_malloc(2 * ETH_ALEN);
1996                         if (!mac_addr)
1997                                 goto failed;
1998
1999                         os_memcpy(mac_addr, src->mac_addr, ETH_ALEN);
2000                         os_memcpy(mac_addr + ETH_ALEN, src->mac_addr_mask,
2001                                   ETH_ALEN);
2002                         params->mac_addr = mac_addr;
2003                         params->mac_addr_mask = mac_addr + ETH_ALEN;
2004                 }
2005         }
2006         return params;
2007
2008 failed:
2009         wpa_scan_free_params(params);
2010         return NULL;
2011 }
2012
2013
2014 void wpa_scan_free_params(struct wpa_driver_scan_params *params)
2015 {
2016         size_t i;
2017
2018         if (params == NULL)
2019                 return;
2020
2021         for (i = 0; i < params->num_ssids; i++)
2022                 os_free((u8 *) params->ssids[i].ssid);
2023         os_free((u8 *) params->extra_ies);
2024         os_free(params->freqs);
2025         os_free(params->filter_ssids);
2026
2027         /*
2028          * Note: params->mac_addr_mask points to same memory allocation and
2029          * must not be freed separately.
2030          */
2031         os_free((u8 *) params->mac_addr);
2032
2033         os_free(params);
2034 }
2035
2036
2037 int wpas_start_pno(struct wpa_supplicant *wpa_s)
2038 {
2039         int ret, interval, prio;
2040         size_t i, num_ssid, num_match_ssid;
2041         struct wpa_ssid *ssid;
2042         struct wpa_driver_scan_params params;
2043
2044         if (!wpa_s->sched_scan_supported)
2045                 return -1;
2046
2047         if (wpa_s->pno || wpa_s->pno_sched_pending)
2048                 return 0;
2049
2050         if ((wpa_s->wpa_state > WPA_SCANNING) &&
2051             (wpa_s->wpa_state <= WPA_COMPLETED)) {
2052                 wpa_printf(MSG_ERROR, "PNO: In assoc process");
2053                 return -EAGAIN;
2054         }
2055
2056         if (wpa_s->wpa_state == WPA_SCANNING) {
2057                 wpa_supplicant_cancel_scan(wpa_s);
2058                 if (wpa_s->sched_scanning) {
2059                         wpa_printf(MSG_DEBUG, "Schedule PNO on completion of "
2060                                    "ongoing sched scan");
2061                         wpa_supplicant_cancel_sched_scan(wpa_s);
2062                         wpa_s->pno_sched_pending = 1;
2063                         return 0;
2064                 }
2065         }
2066
2067         os_memset(&params, 0, sizeof(params));
2068
2069         num_ssid = num_match_ssid = 0;
2070         ssid = wpa_s->conf->ssid;
2071         while (ssid) {
2072                 if (!wpas_network_disabled(wpa_s, ssid)) {
2073                         num_match_ssid++;
2074                         if (ssid->scan_ssid)
2075                                 num_ssid++;
2076                 }
2077                 ssid = ssid->next;
2078         }
2079
2080         if (num_match_ssid == 0) {
2081                 wpa_printf(MSG_DEBUG, "PNO: No configured SSIDs");
2082                 return -1;
2083         }
2084
2085         if (num_match_ssid > num_ssid) {
2086                 params.num_ssids++; /* wildcard */
2087                 num_ssid++;
2088         }
2089
2090         if (num_ssid > WPAS_MAX_SCAN_SSIDS) {
2091                 wpa_printf(MSG_DEBUG, "PNO: Use only the first %u SSIDs from "
2092                            "%u", WPAS_MAX_SCAN_SSIDS, (unsigned int) num_ssid);
2093                 num_ssid = WPAS_MAX_SCAN_SSIDS;
2094         }
2095
2096         if (num_match_ssid > wpa_s->max_match_sets) {
2097                 num_match_ssid = wpa_s->max_match_sets;
2098                 wpa_dbg(wpa_s, MSG_DEBUG, "PNO: Too many SSIDs to match");
2099         }
2100         params.filter_ssids = os_calloc(num_match_ssid,
2101                                         sizeof(struct wpa_driver_scan_filter));
2102         if (params.filter_ssids == NULL)
2103                 return -1;
2104
2105         i = 0;
2106         prio = 0;
2107         ssid = wpa_s->conf->pssid[prio];
2108         while (ssid) {
2109                 if (!wpas_network_disabled(wpa_s, ssid)) {
2110                         if (ssid->scan_ssid && params.num_ssids < num_ssid) {
2111                                 params.ssids[params.num_ssids].ssid =
2112                                         ssid->ssid;
2113                                 params.ssids[params.num_ssids].ssid_len =
2114                                          ssid->ssid_len;
2115                                 params.num_ssids++;
2116                         }
2117                         os_memcpy(params.filter_ssids[i].ssid, ssid->ssid,
2118                                   ssid->ssid_len);
2119                         params.filter_ssids[i].ssid_len = ssid->ssid_len;
2120                         params.num_filter_ssids++;
2121                         i++;
2122                         if (i == num_match_ssid)
2123                                 break;
2124                 }
2125                 if (ssid->pnext)
2126                         ssid = ssid->pnext;
2127                 else if (prio + 1 == wpa_s->conf->num_prio)
2128                         break;
2129                 else
2130                         ssid = wpa_s->conf->pssid[++prio];
2131         }
2132
2133         if (wpa_s->conf->filter_rssi)
2134                 params.filter_rssi = wpa_s->conf->filter_rssi;
2135
2136         interval = wpa_s->conf->sched_scan_interval ?
2137                 wpa_s->conf->sched_scan_interval : 10;
2138
2139         if (params.freqs == NULL && wpa_s->manual_sched_scan_freqs) {
2140                 wpa_dbg(wpa_s, MSG_DEBUG, "Limit sched scan to specified channels");
2141                 params.freqs = wpa_s->manual_sched_scan_freqs;
2142         }
2143
2144         if (wpa_s->mac_addr_rand_enable & MAC_ADDR_RAND_PNO) {
2145                 params.mac_addr_rand = 1;
2146                 if (wpa_s->mac_addr_pno) {
2147                         params.mac_addr = wpa_s->mac_addr_pno;
2148                         params.mac_addr_mask = wpa_s->mac_addr_pno + ETH_ALEN;
2149                 }
2150         }
2151
2152         ret = wpa_supplicant_start_sched_scan(wpa_s, &params, interval);
2153         os_free(params.filter_ssids);
2154         if (ret == 0)
2155                 wpa_s->pno = 1;
2156         else
2157                 wpa_msg(wpa_s, MSG_ERROR, "Failed to schedule PNO");
2158         return ret;
2159 }
2160
2161
2162 int wpas_stop_pno(struct wpa_supplicant *wpa_s)
2163 {
2164         int ret = 0;
2165
2166         if (!wpa_s->pno)
2167                 return 0;
2168
2169         ret = wpa_supplicant_stop_sched_scan(wpa_s);
2170
2171         wpa_s->pno = 0;
2172         wpa_s->pno_sched_pending = 0;
2173
2174         if (wpa_s->wpa_state == WPA_SCANNING)
2175                 wpa_supplicant_req_scan(wpa_s, 0, 0);
2176
2177         return ret;
2178 }
2179
2180
2181 void wpas_mac_addr_rand_scan_clear(struct wpa_supplicant *wpa_s,
2182                                     unsigned int type)
2183 {
2184         type &= MAC_ADDR_RAND_ALL;
2185         wpa_s->mac_addr_rand_enable &= ~type;
2186
2187         if (type & MAC_ADDR_RAND_SCAN) {
2188                 os_free(wpa_s->mac_addr_scan);
2189                 wpa_s->mac_addr_scan = NULL;
2190         }
2191
2192         if (type & MAC_ADDR_RAND_SCHED_SCAN) {
2193                 os_free(wpa_s->mac_addr_sched_scan);
2194                 wpa_s->mac_addr_sched_scan = NULL;
2195         }
2196
2197         if (type & MAC_ADDR_RAND_PNO) {
2198                 os_free(wpa_s->mac_addr_pno);
2199                 wpa_s->mac_addr_pno = NULL;
2200         }
2201 }
2202
2203
2204 int wpas_mac_addr_rand_scan_set(struct wpa_supplicant *wpa_s,
2205                                 unsigned int type, const u8 *addr,
2206                                 const u8 *mask)
2207 {
2208         u8 *tmp = NULL;
2209
2210         wpas_mac_addr_rand_scan_clear(wpa_s, type);
2211
2212         if (addr) {
2213                 tmp = os_malloc(2 * ETH_ALEN);
2214                 if (!tmp)
2215                         return -1;
2216                 os_memcpy(tmp, addr, ETH_ALEN);
2217                 os_memcpy(tmp + ETH_ALEN, mask, ETH_ALEN);
2218         }
2219
2220         if (type == MAC_ADDR_RAND_SCAN) {
2221                 wpa_s->mac_addr_scan = tmp;
2222         } else if (type == MAC_ADDR_RAND_SCHED_SCAN) {
2223                 wpa_s->mac_addr_sched_scan = tmp;
2224         } else if (type == MAC_ADDR_RAND_PNO) {
2225                 wpa_s->mac_addr_pno = tmp;
2226         } else {
2227                 wpa_printf(MSG_INFO,
2228                            "scan: Invalid MAC randomization type=0x%x",
2229                            type);
2230                 os_free(tmp);
2231                 return -1;
2232         }
2233
2234         wpa_s->mac_addr_rand_enable |= type;
2235         return 0;
2236 }