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
  26
  27 static void wpa_supplicant_gen_assoc_event(struct wpa_supplicant *wpa_s)
  28 {
  29         struct wpa_ssid *ssid;
  30         union wpa_event_data data;
  31
  32         ssid = wpa_supplicant_get_ssid(wpa_s);
  33         if (ssid == NULL)
  34                 return;
  35
  36         if (wpa_s->current_ssid == NULL) {
  37                 wpa_s->current_ssid = ssid;
  38                 if (wpa_s->current_ssid != NULL)
  39                         wpas_notify_network_changed(wpa_s);
  40         }
  41         wpa_supplicant_initiate_eapol(wpa_s);
  42         wpa_dbg(wpa_s, MSG_DEBUG, "Already associated with a configured "
  43                 "network - generating associated event");
  44         os_memset(&data, 0, sizeof(data));
  45         wpa_supplicant_event(wpa_s, EVENT_ASSOC, &data);
  46 }
  47
  48
  49 #ifdef CONFIG_WPS
  50 static int wpas_wps_in_use(struct wpa_supplicant *wpa_s,
  51                            enum wps_request_type *req_type)
  52 {
  53         struct wpa_ssid *ssid;
  54         int wps = 0;
  55
  56         for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
  57                 if (!(ssid->key_mgmt & WPA_KEY_MGMT_WPS))
  58                         continue;
  59
  60                 wps = 1;
  61                 *req_type = wpas_wps_get_req_type(ssid);
  62                 if (!ssid->eap.phase1)
  63                         continue;
  64
  65                 if (os_strstr(ssid->eap.phase1, "pbc=1"))
  66                         return 2;
  67         }
  68
  69 #ifdef CONFIG_P2P
  70         if (!wpa_s->global->p2p_disabled && wpa_s->global->p2p &&
  71             !wpa_s->conf->p2p_disabled) {
  72                 wpa_s->wps->dev.p2p = 1;
  73                 if (!wps) {
  74                         wps = 1;
  75                         *req_type = WPS_REQ_ENROLLEE_INFO;
  76                 }
  77         }
  78 #endif /* CONFIG_P2P */
  79
  80         return wps;
  81 }
  82 #endif /* CONFIG_WPS */
  83
  84
  85 /**
  86  * wpa_supplicant_enabled_networks - Check whether there are enabled networks
  87  * @wpa_s: Pointer to wpa_supplicant data
  88  * Returns: 0 if no networks are enabled, >0 if networks are enabled
  89  *
  90  * This function is used to figure out whether any networks (or Interworking
  91  * with enabled credentials and auto_interworking) are present in the current
  92  * configuration.
  93  */
  94 int wpa_supplicant_enabled_networks(struct wpa_supplicant *wpa_s)
  95 {
  96         struct wpa_ssid *ssid = wpa_s->conf->ssid;
  97         int count = 0, disabled = 0;
  98         while (ssid) {
  99                 if (!wpas_network_disabled(wpa_s, ssid))
 100                         count++;
 101                 else
 102                         disabled++;
 103                 ssid = ssid->next;
 104         }
 105         if (wpa_s->conf->cred && wpa_s->conf->interworking &&
 106             wpa_s->conf->auto_interworking)
 107                 count++;
 108         if (count == 0 && disabled > 0) {
 109                 wpa_dbg(wpa_s, MSG_DEBUG, "No enabled networks (%d disabled "
 110                         "networks)", disabled);
 111         }
 112         return count;
 113 }
 114
 115
 116 static void wpa_supplicant_assoc_try(struct wpa_supplicant *wpa_s,
 117                                      struct wpa_ssid *ssid)
 118 {
 119         while (ssid) {
 120                 if (!wpas_network_disabled(wpa_s, ssid))
 121                         break;
 122                 ssid = ssid->next;
 123         }
 124
 125         /* ap_scan=2 mode - try to associate with each SSID. */
 126         if (ssid == NULL) {
 127                 wpa_dbg(wpa_s, MSG_DEBUG, "wpa_supplicant_assoc_try: Reached "
 128                         "end of scan list - go back to beginning");
 129                 wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
 130                 wpa_supplicant_req_scan(wpa_s, 0, 0);
 131                 return;
 132         }
 133         if (ssid->next) {
 134                 /* Continue from the next SSID on the next attempt. */
 135                 wpa_s->prev_scan_ssid = ssid;
 136         } else {
 137                 /* Start from the beginning of the SSID list. */
 138                 wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
 139         }
 140         wpa_supplicant_associate(wpa_s, NULL, ssid);
 141 }
 142
 143
 144 static void wpas_trigger_scan_cb(struct wpa_radio_work *work, int deinit)
 145 {
 146         struct wpa_supplicant *wpa_s = work->wpa_s;
 147         struct wpa_driver_scan_params *params = work->ctx;
 148         int ret;
 149
 150         if (deinit) {
 151                 if (!work->started) {
 152                         wpa_scan_free_params(params);
 153                         return;
 154                 }
 155                 wpa_supplicant_notify_scanning(wpa_s, 0);
 156                 wpas_notify_scan_done(wpa_s, 0);
 157                 wpa_s->scan_work = NULL;
 158                 return;
 159         }
 160
 161         wpa_supplicant_notify_scanning(wpa_s, 1);
 162
 163         if (wpa_s->clear_driver_scan_cache)
 164                 params->only_new_results = 1;
 165         ret = wpa_drv_scan(wpa_s, params);
 166         wpa_scan_free_params(params);
 167         work->ctx = NULL;
 168         if (ret) {
 169                 wpa_supplicant_notify_scanning(wpa_s, 0);
 170                 wpas_notify_scan_done(wpa_s, 0);
 171                 radio_work_done(work);
 172                 return;
 173         }
 174
 175         os_get_reltime(&wpa_s->scan_trigger_time);
 176         wpa_s->scan_runs++;
 177         wpa_s->normal_scans++;
 178         wpa_s->own_scan_requested = 1;
 179         wpa_s->clear_driver_scan_cache = 0;
 180         wpa_s->scan_work = work;
 181 }
 182
 183
 184 /**
 185  * wpa_supplicant_trigger_scan - Request driver to start a scan
 186  * @wpa_s: Pointer to wpa_supplicant data
 187  * @params: Scan parameters
 188  * Returns: 0 on success, -1 on failure
 189  */
 190 int wpa_supplicant_trigger_scan(struct wpa_supplicant *wpa_s,
 191                                 struct wpa_driver_scan_params *params)
 192 {
 193         struct wpa_driver_scan_params *ctx;
 194
 195         if (wpa_s->scan_work) {
 196                 wpa_dbg(wpa_s, MSG_INFO, "Reject scan trigger since one is already pending");
 197                 return -1;
 198         }
 199
 200         ctx = wpa_scan_clone_params(params);
 201         if (ctx == NULL)
 202                 return -1;
 203
 204         if (radio_add_work(wpa_s, 0, "scan", 0, wpas_trigger_scan_cb, ctx) < 0)
 205         {
 206                 wpa_scan_free_params(ctx);
 207                 return -1;
 208         }
 209
 210         return 0;
 211 }
 212
 213
 214 static void
 215 wpa_supplicant_delayed_sched_scan_timeout(void *eloop_ctx, void *timeout_ctx)
 216 {
 217         struct wpa_supplicant *wpa_s = eloop_ctx;
 218
 219         wpa_dbg(wpa_s, MSG_DEBUG, "Starting delayed sched scan");
 220
 221         if (wpa_supplicant_req_sched_scan(wpa_s))
 222                 wpa_supplicant_req_scan(wpa_s, 0, 0);
 223 }
 224
 225
 226 static void
 227 wpa_supplicant_sched_scan_timeout(void *eloop_ctx, void *timeout_ctx)
 228 {
 229         struct wpa_supplicant *wpa_s = eloop_ctx;
 230
 231         wpa_dbg(wpa_s, MSG_DEBUG, "Sched scan timeout - stopping it");
 232
 233         wpa_s->sched_scan_timed_out = 1;
 234         wpa_supplicant_cancel_sched_scan(wpa_s);
 235 }
 236
 237
 238 int wpa_supplicant_start_sched_scan(struct wpa_supplicant *wpa_s,
 239                                     struct wpa_driver_scan_params *params,
 240                                     int interval)
 241 {
 242         int ret;
 243
 244         wpa_supplicant_notify_scanning(wpa_s, 1);
 245         ret = wpa_drv_sched_scan(wpa_s, params, interval * 1000);
 246         if (ret)
 247                 wpa_supplicant_notify_scanning(wpa_s, 0);
 248         else
 249                 wpa_s->sched_scanning = 1;
 250
 251         return ret;
 252 }
 253
 254
 255 int wpa_supplicant_stop_sched_scan(struct wpa_supplicant *wpa_s)
 256 {
 257         int ret;
 258
 259         ret = wpa_drv_stop_sched_scan(wpa_s);
 260         if (ret) {
 261                 wpa_dbg(wpa_s, MSG_DEBUG, "stopping sched_scan failed!");
 262                 /* TODO: what to do if stopping fails? */
 263                 return -1;
 264         }
 265
 266         return ret;
 267 }
 268
 269
 270 static struct wpa_driver_scan_filter *
 271 wpa_supplicant_build_filter_ssids(struct wpa_config *conf, size_t *num_ssids)
 272 {
 273         struct wpa_driver_scan_filter *ssids;
 274         struct wpa_ssid *ssid;
 275         size_t count;
 276
 277         *num_ssids = 0;
 278         if (!conf->filter_ssids)
 279                 return NULL;
 280
 281         for (count = 0, ssid = conf->ssid; ssid; ssid = ssid->next) {
 282                 if (ssid->ssid && ssid->ssid_len)
 283                         count++;
 284         }
 285         if (count == 0)
 286                 return NULL;
 287         ssids = os_zalloc(count * sizeof(struct wpa_driver_scan_filter));
 288         if (ssids == NULL)
 289                 return NULL;
 290
 291         for (ssid = conf->ssid; ssid; ssid = ssid->next) {
 292                 if (!ssid->ssid || !ssid->ssid_len)
 293                         continue;
 294                 os_memcpy(ssids[*num_ssids].ssid, ssid->ssid, ssid->ssid_len);
 295                 ssids[*num_ssids].ssid_len = ssid->ssid_len;
 296                 (*num_ssids)++;
 297         }
 298
 299         return ssids;
 300 }
 301
 302
 303 static void wpa_supplicant_optimize_freqs(
 304         struct wpa_supplicant *wpa_s, struct wpa_driver_scan_params *params)
 305 {
 306 #ifdef CONFIG_P2P
 307         if (params->freqs == NULL && wpa_s->p2p_in_provisioning &&
 308             wpa_s->go_params) {
 309                 /* Optimize provisioning state scan based on GO information */
 310                 if (wpa_s->p2p_in_provisioning < 5 &&
 311                     wpa_s->go_params->freq > 0) {
 312                         wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only GO "
 313                                 "preferred frequency %d MHz",
 314                                 wpa_s->go_params->freq);
 315                         params->freqs = os_zalloc(2 * sizeof(int));
 316                         if (params->freqs)
 317                                 params->freqs[0] = wpa_s->go_params->freq;
 318                 } else if (wpa_s->p2p_in_provisioning < 8 &&
 319                            wpa_s->go_params->freq_list[0]) {
 320                         wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only common "
 321                                 "channels");
 322                         int_array_concat(&params->freqs,
 323                                          wpa_s->go_params->freq_list);
 324                         if (params->freqs)
 325                                 int_array_sort_unique(params->freqs);
 326                 }
 327                 wpa_s->p2p_in_provisioning++;
 328         }
 329 #endif /* CONFIG_P2P */
 330
 331 #ifdef CONFIG_WPS
 332         if (params->freqs == NULL && wpa_s->after_wps && wpa_s->wps_freq) {
 333                 /*
 334                  * Optimize post-provisioning scan based on channel used
 335                  * during provisioning.
 336                  */
 337                 wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Scan only frequency %u MHz "
 338                         "that was used during provisioning", wpa_s->wps_freq);
 339                 params->freqs = os_zalloc(2 * sizeof(int));
 340                 if (params->freqs)
 341                         params->freqs[0] = wpa_s->wps_freq;
 342                 wpa_s->after_wps--;
 343         } else if (wpa_s->after_wps)
 344                 wpa_s->after_wps--;
 345
 346         if (params->freqs == NULL && wpa_s->known_wps_freq && wpa_s->wps_freq)
 347         {
 348                 /* Optimize provisioning scan based on already known channel */
 349                 wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Scan only frequency %u MHz",
 350                         wpa_s->wps_freq);
 351                 params->freqs = os_zalloc(2 * sizeof(int));
 352                 if (params->freqs)
 353                         params->freqs[0] = wpa_s->wps_freq;
 354                 wpa_s->known_wps_freq = 0; /* only do this once */
 355         }
 356 #endif /* CONFIG_WPS */
 357 }
 358
 359
 360 #ifdef CONFIG_INTERWORKING
 361 static void wpas_add_interworking_elements(struct wpa_supplicant *wpa_s,
 362                                            struct wpabuf *buf)
 363 {
 364         if (wpa_s->conf->interworking == 0)
 365                 return;
 366
 367         wpabuf_put_u8(buf, WLAN_EID_EXT_CAPAB);
 368         wpabuf_put_u8(buf, 6);
 369         wpabuf_put_u8(buf, 0x00);
 370         wpabuf_put_u8(buf, 0x00);
 371         wpabuf_put_u8(buf, 0x00);
 372         wpabuf_put_u8(buf, 0x80); /* Bit 31 - Interworking */
 373         wpabuf_put_u8(buf, 0x00);
 374 #ifdef CONFIG_HS20
 375         wpabuf_put_u8(buf, 0x40); /* Bit 46 - WNM-Notification */
 376 #else /* CONFIG_HS20 */
 377         wpabuf_put_u8(buf, 0x00);
 378 #endif /* CONFIG_HS20 */
 379
 380         wpabuf_put_u8(buf, WLAN_EID_INTERWORKING);
 381         wpabuf_put_u8(buf, is_zero_ether_addr(wpa_s->conf->hessid) ? 1 :
 382                       1 + ETH_ALEN);
 383         wpabuf_put_u8(buf, wpa_s->conf->access_network_type);
 384         /* No Venue Info */
 385         if (!is_zero_ether_addr(wpa_s->conf->hessid))
 386                 wpabuf_put_data(buf, wpa_s->conf->hessid, ETH_ALEN);
 387 }
 388 #endif /* CONFIG_INTERWORKING */
 389
 390
 391 static struct wpabuf * wpa_supplicant_extra_ies(struct wpa_supplicant *wpa_s)
 392 {
 393         struct wpabuf *extra_ie = NULL;
 394 #ifdef CONFIG_WPS
 395         int wps = 0;
 396         enum wps_request_type req_type = WPS_REQ_ENROLLEE_INFO;
 397 #endif /* CONFIG_WPS */
 398
 399 #ifdef CONFIG_INTERWORKING
 400         if (wpa_s->conf->interworking &&
 401             wpabuf_resize(&extra_ie, 100) == 0)
 402                 wpas_add_interworking_elements(wpa_s, extra_ie);
 403 #endif /* CONFIG_INTERWORKING */
 404
 405 #ifdef CONFIG_WPS
 406         wps = wpas_wps_in_use(wpa_s, &req_type);
 407
 408         if (wps) {
 409                 struct wpabuf *wps_ie;
 410                 wps_ie = wps_build_probe_req_ie(wps == 2 ? DEV_PW_PUSHBUTTON :
 411                                                 DEV_PW_DEFAULT,
 412                                                 &wpa_s->wps->dev,
 413                                                 wpa_s->wps->uuid, req_type,
 414                                                 0, NULL);
 415                 if (wps_ie) {
 416                         if (wpabuf_resize(&extra_ie, wpabuf_len(wps_ie)) == 0)
 417                                 wpabuf_put_buf(extra_ie, wps_ie);
 418                         wpabuf_free(wps_ie);
 419                 }
 420         }
 421
 422 #ifdef CONFIG_P2P
 423         if (wps) {
 424                 size_t ielen = p2p_scan_ie_buf_len(wpa_s->global->p2p);
 425                 if (wpabuf_resize(&extra_ie, ielen) == 0)
 426                         wpas_p2p_scan_ie(wpa_s, extra_ie);
 427         }
 428 #endif /* CONFIG_P2P */
 429
 430 #endif /* CONFIG_WPS */
 431
 432 #ifdef CONFIG_HS20
 433         if (wpa_s->conf->hs20 && wpabuf_resize(&extra_ie, 7) == 0)
 434                 wpas_hs20_add_indication(extra_ie, -1);
 435 #endif /* CONFIG_HS20 */
 436
 437         return extra_ie;
 438 }
 439
 440
 441 #ifdef CONFIG_P2P
 442
 443 /*
 444  * Check whether there are any enabled networks or credentials that could be
 445  * used for a non-P2P connection.
 446  */
 447 static int non_p2p_network_enabled(struct wpa_supplicant *wpa_s)
 448 {
 449         struct wpa_ssid *ssid;
 450
 451         for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
 452                 if (wpas_network_disabled(wpa_s, ssid))
 453                         continue;
 454                 if (!ssid->p2p_group)
 455                         return 1;
 456         }
 457
 458         if (wpa_s->conf->cred && wpa_s->conf->interworking &&
 459             wpa_s->conf->auto_interworking)
 460                 return 1;
 461
 462         return 0;
 463 }
 464
 465 #endif /* CONFIG_P2P */
 466
 467
 468 static struct hostapd_hw_modes * get_mode(struct hostapd_hw_modes *modes,
 469                                           u16 num_modes,
 470                                           enum hostapd_hw_mode mode)
 471 {
 472         u16 i;
 473
 474         for (i = 0; i < num_modes; i++) {
 475                 if (modes[i].mode == mode)
 476                         return &modes[i];
 477         }
 478
 479         return NULL;
 480 }
 481
 482
 483 static void wpa_setband_scan_freqs_list(struct wpa_supplicant *wpa_s,
 484                                         enum hostapd_hw_mode band,
 485                                         struct wpa_driver_scan_params *params)
 486 {
 487         /* Include only supported channels for the specified band */
 488         struct hostapd_hw_modes *mode;
 489         int count, i;
 490
 491         mode = get_mode(wpa_s->hw.modes, wpa_s->hw.num_modes, band);
 492         if (mode == NULL) {
 493                 /* No channels supported in this band - use empty list */
 494                 params->freqs = os_zalloc(sizeof(int));
 495                 return;
 496         }
 497
 498         params->freqs = os_zalloc((mode->num_channels + 1) * sizeof(int));
 499         if (params->freqs == NULL)
 500                 return;
 501         for (count = 0, i = 0; i < mode->num_channels; i++) {
 502                 if (mode->channels[i].flag & HOSTAPD_CHAN_DISABLED)
 503                         continue;
 504                 params->freqs[count++] = mode->channels[i].freq;
 505         }
 506 }
 507
 508
 509 static void wpa_setband_scan_freqs(struct wpa_supplicant *wpa_s,
 510                                    struct wpa_driver_scan_params *params)
 511 {
 512         if (wpa_s->hw.modes == NULL)
 513                 return; /* unknown what channels the driver supports */
 514         if (params->freqs)
 515                 return; /* already using a limited channel set */
 516         if (wpa_s->setband == WPA_SETBAND_5G)
 517                 wpa_setband_scan_freqs_list(wpa_s, HOSTAPD_MODE_IEEE80211A,
 518                                             params);
 519         else if (wpa_s->setband == WPA_SETBAND_2G)
 520                 wpa_setband_scan_freqs_list(wpa_s, HOSTAPD_MODE_IEEE80211G,
 521                                             params);
 522 }
 523
 524
 525 static void wpa_supplicant_scan(void *eloop_ctx, void *timeout_ctx)
 526 {
 527         struct wpa_supplicant *wpa_s = eloop_ctx;
 528         struct wpa_ssid *ssid;
 529         int ret;
 530         struct wpabuf *extra_ie = NULL;
 531         struct wpa_driver_scan_params params;
 532         struct wpa_driver_scan_params *scan_params;
 533         size_t max_ssids;
 534         enum wpa_states prev_state;
 535
 536         if (wpa_s->pno || wpa_s->pno_sched_pending) {
 537                 wpa_dbg(wpa_s, MSG_DEBUG, "Skip scan - PNO is in progress");
 538                 return;
 539         }
 540
 541         if (wpa_s->wpa_state == WPA_INTERFACE_DISABLED) {
 542                 wpa_dbg(wpa_s, MSG_DEBUG, "Skip scan - interface disabled");
 543                 return;
 544         }
 545
 546         if (wpa_s->disconnected && wpa_s->scan_req == NORMAL_SCAN_REQ) {
 547                 wpa_dbg(wpa_s, MSG_DEBUG, "Disconnected - do not scan");
 548                 wpa_supplicant_set_state(wpa_s, WPA_DISCONNECTED);
 549                 return;
 550         }
 551
 552         if (wpa_s->scanning) {
 553                 /*
 554                  * If we are already in scanning state, we shall reschedule the
 555                  * the incoming scan request.
 556                  */
 557                 wpa_dbg(wpa_s, MSG_DEBUG, "Already scanning - Reschedule the incoming scan req");
 558                 wpa_supplicant_req_scan(wpa_s, 1, 0);
 559                 return;
 560         }
 561
 562         if (!wpa_supplicant_enabled_networks(wpa_s) &&
 563             wpa_s->scan_req == NORMAL_SCAN_REQ) {
 564                 wpa_dbg(wpa_s, MSG_DEBUG, "No enabled networks - do not scan");
 565                 wpa_supplicant_set_state(wpa_s, WPA_INACTIVE);
 566                 return;
 567         }
 568
 569         if (wpa_s->conf->ap_scan != 0 &&
 570             (wpa_s->drv_flags & WPA_DRIVER_FLAGS_WIRED)) {
 571                 wpa_dbg(wpa_s, MSG_DEBUG, "Using wired authentication - "
 572                         "overriding ap_scan configuration");
 573                 wpa_s->conf->ap_scan = 0;
 574                 wpas_notify_ap_scan_changed(wpa_s);
 575         }
 576
 577         if (wpa_s->conf->ap_scan == 0) {
 578                 wpa_supplicant_gen_assoc_event(wpa_s);
 579                 return;
 580         }
 581
 582 #ifdef CONFIG_P2P
 583         if (wpas_p2p_in_progress(wpa_s)) {
 584                 wpa_dbg(wpa_s, MSG_DEBUG, "Delay station mode scan while P2P operation is in progress");
 585                 wpa_supplicant_req_scan(wpa_s, 5, 0);
 586                 return;
 587         }
 588 #endif /* CONFIG_P2P */
 589
 590         if (wpa_s->conf->ap_scan == 2)
 591                 max_ssids = 1;
 592         else {
 593                 max_ssids = wpa_s->max_scan_ssids;
 594                 if (max_ssids > WPAS_MAX_SCAN_SSIDS)
 595                         max_ssids = WPAS_MAX_SCAN_SSIDS;
 596         }
 597
 598         wpa_s->last_scan_req = wpa_s->scan_req;
 599         wpa_s->scan_req = NORMAL_SCAN_REQ;
 600
 601         os_memset(&params, 0, sizeof(params));
 602
 603         prev_state = wpa_s->wpa_state;
 604         if (wpa_s->wpa_state == WPA_DISCONNECTED ||
 605             wpa_s->wpa_state == WPA_INACTIVE)
 606                 wpa_supplicant_set_state(wpa_s, WPA_SCANNING);
 607
 608         /*
 609          * If autoscan has set its own scanning parameters
 610          */
 611         if (wpa_s->autoscan_params != NULL) {
 612                 scan_params = wpa_s->autoscan_params;
 613                 goto scan;
 614         }
 615
 616         if (wpa_s->last_scan_req != MANUAL_SCAN_REQ &&
 617             wpa_s->connect_without_scan) {
 618                 for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
 619                         if (ssid == wpa_s->connect_without_scan)
 620                                 break;
 621                 }
 622                 wpa_s->connect_without_scan = NULL;
 623                 if (ssid) {
 624                         wpa_printf(MSG_DEBUG, "Start a pre-selected network "
 625                                    "without scan step");
 626                         wpa_supplicant_associate(wpa_s, NULL, ssid);
 627                         return;
 628                 }
 629         }
 630
 631 #ifdef CONFIG_P2P
 632         if ((wpa_s->p2p_in_provisioning || wpa_s->show_group_started) &&
 633             wpa_s->go_params) {
 634                 wpa_printf(MSG_DEBUG, "P2P: Use specific SSID for scan during P2P group formation (p2p_in_provisioning=%d show_group_started=%d)",
 635                            wpa_s->p2p_in_provisioning,
 636                            wpa_s->show_group_started);
 637                 params.ssids[0].ssid = wpa_s->go_params->ssid;
 638                 params.ssids[0].ssid_len = wpa_s->go_params->ssid_len;
 639                 params.num_ssids = 1;
 640                 goto ssid_list_set;
 641         }
 642 #endif /* CONFIG_P2P */
 643
 644         /* Find the starting point from which to continue scanning */
 645         ssid = wpa_s->conf->ssid;
 646         if (wpa_s->prev_scan_ssid != WILDCARD_SSID_SCAN) {
 647                 while (ssid) {
 648                         if (ssid == wpa_s->prev_scan_ssid) {
 649                                 ssid = ssid->next;
 650                                 break;
 651                         }
 652                         ssid = ssid->next;
 653                 }
 654         }
 655
 656         if (wpa_s->last_scan_req != MANUAL_SCAN_REQ &&
 657             wpa_s->conf->ap_scan == 2) {
 658                 wpa_s->connect_without_scan = NULL;
 659                 wpa_s->prev_scan_wildcard = 0;
 660                 wpa_supplicant_assoc_try(wpa_s, ssid);
 661                 return;
 662         } else if (wpa_s->conf->ap_scan == 2) {
 663                 /*
 664                  * User-initiated scan request in ap_scan == 2; scan with
 665                  * wildcard SSID.
 666                  */
 667                 ssid = NULL;
 668         } else if (wpa_s->reattach && wpa_s->current_ssid != NULL) {
 669                 /*
 670                  * Perform single-channel single-SSID scan for
 671                  * reassociate-to-same-BSS operation.
 672                  */
 673                 /* Setup SSID */
 674                 ssid = wpa_s->current_ssid;
 675                 wpa_hexdump_ascii(MSG_DEBUG, "Scan SSID",
 676                                   ssid->ssid, ssid->ssid_len);
 677                 params.ssids[0].ssid = ssid->ssid;
 678                 params.ssids[0].ssid_len = ssid->ssid_len;
 679                 params.num_ssids = 1;
 680
 681                 /*
 682                  * Allocate memory for frequency array, allocate one extra
 683                  * slot for the zero-terminator.
 684                  */
 685                 params.freqs = os_malloc(sizeof(int) * 2);
 686                 if (params.freqs == NULL) {
 687                         wpa_dbg(wpa_s, MSG_ERROR, "Memory allocation failed");
 688                         return;
 689                 }
 690                 params.freqs[0] = wpa_s->assoc_freq;
 691                 params.freqs[1] = 0;
 692
 693                 /*
 694                  * Reset the reattach flag so that we fall back to full scan if
 695                  * this scan fails.
 696                  */
 697                 wpa_s->reattach = 0;
 698         } else {
 699                 struct wpa_ssid *start = ssid, *tssid;
 700                 int freqs_set = 0;
 701                 if (ssid == NULL && max_ssids > 1)
 702                         ssid = wpa_s->conf->ssid;
 703                 while (ssid) {
 704                         if (!wpas_network_disabled(wpa_s, ssid) &&
 705                             ssid->scan_ssid) {
 706                                 wpa_hexdump_ascii(MSG_DEBUG, "Scan SSID",
 707                                                   ssid->ssid, ssid->ssid_len);
 708                                 params.ssids[params.num_ssids].ssid =
 709                                         ssid->ssid;
 710                                 params.ssids[params.num_ssids].ssid_len =
 711                                         ssid->ssid_len;
 712                                 params.num_ssids++;
 713                                 if (params.num_ssids + 1 >= max_ssids)
 714                                         break;
 715                         }
 716                         ssid = ssid->next;
 717                         if (ssid == start)
 718                                 break;
 719                         if (ssid == NULL && max_ssids > 1 &&
 720                             start != wpa_s->conf->ssid)
 721                                 ssid = wpa_s->conf->ssid;
 722                 }
 723
 724                 for (tssid = wpa_s->conf->ssid; tssid; tssid = tssid->next) {
 725                         if (wpas_network_disabled(wpa_s, tssid))
 726                                 continue;
 727                         if ((params.freqs || !freqs_set) && tssid->scan_freq) {
 728                                 int_array_concat(&params.freqs,
 729                                                  tssid->scan_freq);
 730                         } else {
 731                                 os_free(params.freqs);
 732                                 params.freqs = NULL;
 733                         }
 734                         freqs_set = 1;
 735                 }
 736                 int_array_sort_unique(params.freqs);
 737         }
 738
 739         if (ssid && max_ssids == 1) {
 740                 /*
 741                  * If the driver is limited to 1 SSID at a time interleave
 742                  * wildcard SSID scans with specific SSID scans to avoid
 743                  * waiting a long time for a wildcard scan.
 744                  */
 745                 if (!wpa_s->prev_scan_wildcard) {
 746                         params.ssids[0].ssid = NULL;
 747                         params.ssids[0].ssid_len = 0;
 748                         wpa_s->prev_scan_wildcard = 1;
 749                         wpa_dbg(wpa_s, MSG_DEBUG, "Starting AP scan for "
 750                                 "wildcard SSID (Interleave with specific)");
 751                 } else {
 752                         wpa_s->prev_scan_ssid = ssid;
 753                         wpa_s->prev_scan_wildcard = 0;
 754                         wpa_dbg(wpa_s, MSG_DEBUG,
 755                                 "Starting AP scan for specific SSID: %s",
 756                                 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
 757                 }
 758         } else if (ssid) {
 759                 /* max_ssids > 1 */
 760
 761                 wpa_s->prev_scan_ssid = ssid;
 762                 wpa_dbg(wpa_s, MSG_DEBUG, "Include wildcard SSID in "
 763                         "the scan request");
 764                 params.num_ssids++;
 765         } else if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
 766                    wpa_s->manual_scan_passive && params.num_ssids == 0) {
 767                 wpa_dbg(wpa_s, MSG_DEBUG, "Use passive scan based on manual request");
 768         } else {
 769                 wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
 770                 params.num_ssids++;
 771                 wpa_dbg(wpa_s, MSG_DEBUG, "Starting AP scan for wildcard "
 772                         "SSID");
 773         }
 774 #ifdef CONFIG_P2P
 775 ssid_list_set:
 776 #endif /* CONFIG_P2P */
 777
 778         wpa_supplicant_optimize_freqs(wpa_s, &params);
 779         extra_ie = wpa_supplicant_extra_ies(wpa_s);
 780
 781         if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
 782             wpa_s->manual_scan_only_new)
 783                 params.only_new_results = 1;
 784
 785         if (wpa_s->last_scan_req == MANUAL_SCAN_REQ && params.freqs == NULL &&
 786             wpa_s->manual_scan_freqs) {
 787                 wpa_dbg(wpa_s, MSG_DEBUG, "Limit manual scan to specified channels");
 788                 params.freqs = wpa_s->manual_scan_freqs;
 789                 wpa_s->manual_scan_freqs = NULL;
 790         }
 791
 792         if (params.freqs == NULL && wpa_s->next_scan_freqs) {
 793                 wpa_dbg(wpa_s, MSG_DEBUG, "Optimize scan based on previously "
 794                         "generated frequency list");
 795                 params.freqs = wpa_s->next_scan_freqs;
 796         } else
 797                 os_free(wpa_s->next_scan_freqs);
 798         wpa_s->next_scan_freqs = NULL;
 799         wpa_setband_scan_freqs(wpa_s, &params);
 800
 801         /* See if user specified frequencies. If so, scan only those. */
 802         if (wpa_s->conf->freq_list && !params.freqs) {
 803                 wpa_dbg(wpa_s, MSG_DEBUG,
 804                         "Optimize scan based on conf->freq_list");
 805                 int_array_concat(&params.freqs, wpa_s->conf->freq_list);
 806         }
 807
 808         /* Use current associated channel? */
 809         if (wpa_s->conf->scan_cur_freq && !params.freqs) {
 810                 unsigned int num = wpa_s->num_multichan_concurrent;
 811
 812                 params.freqs = os_calloc(num + 1, sizeof(int));
 813                 if (params.freqs) {
 814                         num = get_shared_radio_freqs(wpa_s, params.freqs, num);
 815                         if (num > 0) {
 816                                 wpa_dbg(wpa_s, MSG_DEBUG, "Scan only the "
 817                                         "current operating channels since "
 818                                         "scan_cur_freq is enabled");
 819                         } else {
 820                                 os_free(params.freqs);
 821                                 params.freqs = NULL;
 822                         }
 823                 }
 824         }
 825
 826         params.filter_ssids = wpa_supplicant_build_filter_ssids(
 827                 wpa_s->conf, &params.num_filter_ssids);
 828         if (extra_ie) {
 829                 params.extra_ies = wpabuf_head(extra_ie);
 830                 params.extra_ies_len = wpabuf_len(extra_ie);
 831         }
 832
 833 #ifdef CONFIG_P2P
 834         if (wpa_s->p2p_in_provisioning ||
 835             (wpa_s->show_group_started && wpa_s->go_params)) {
 836                 /*
 837                  * The interface may not yet be in P2P mode, so we have to
 838                  * explicitly request P2P probe to disable CCK rates.
 839                  */
 840                 params.p2p_probe = 1;
 841         }
 842 #endif /* CONFIG_P2P */
 843
 844         scan_params = &params;
 845
 846 scan:
 847 #ifdef CONFIG_P2P
 848         /*
 849          * If the driver does not support multi-channel concurrency and a
 850          * virtual interface that shares the same radio with the wpa_s interface
 851          * is operating there may not be need to scan other channels apart from
 852          * the current operating channel on the other virtual interface. Filter
 853          * out other channels in case we are trying to find a connection for a
 854          * station interface when we are not configured to prefer station
 855          * connection and a concurrent operation is already in process.
 856          */
 857         if (wpa_s->scan_for_connection &&
 858             wpa_s->last_scan_req == NORMAL_SCAN_REQ &&
 859             !scan_params->freqs && !params.freqs &&
 860             wpas_is_p2p_prioritized(wpa_s) &&
 861             wpa_s->p2p_group_interface == NOT_P2P_GROUP_INTERFACE &&
 862             non_p2p_network_enabled(wpa_s)) {
 863                 unsigned int num = wpa_s->num_multichan_concurrent;
 864
 865                 params.freqs = os_calloc(num + 1, sizeof(int));
 866                 if (params.freqs) {
 867                         num = get_shared_radio_freqs(wpa_s, params.freqs, num);
 868                         if (num > 0 && num == wpa_s->num_multichan_concurrent) {
 869                                 wpa_dbg(wpa_s, MSG_DEBUG, "Scan only the current operating channels since all channels are already used");
 870                         } else {
 871                                 os_free(params.freqs);
 872                                 params.freqs = NULL;
 873                         }
 874                 }
 875         }
 876 #endif /* CONFIG_P2P */
 877
 878         ret = wpa_supplicant_trigger_scan(wpa_s, scan_params);
 879
 880         if (ret && wpa_s->last_scan_req == MANUAL_SCAN_REQ && params.freqs &&
 881             !wpa_s->manual_scan_freqs) {
 882                 /* Restore manual_scan_freqs for the next attempt */
 883                 wpa_s->manual_scan_freqs = params.freqs;
 884                 params.freqs = NULL;
 885         }
 886
 887         wpabuf_free(extra_ie);
 888         os_free(params.freqs);
 889         os_free(params.filter_ssids);
 890
 891         if (ret) {
 892                 wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate AP scan");
 893                 if (prev_state != wpa_s->wpa_state)
 894                         wpa_supplicant_set_state(wpa_s, prev_state);
 895                 /* Restore scan_req since we will try to scan again */
 896                 wpa_s->scan_req = wpa_s->last_scan_req;
 897                 wpa_supplicant_req_scan(wpa_s, 1, 0);
 898         } else {
 899                 wpa_s->scan_for_connection = 0;
 900         }
 901 }
 902
 903
 904 void wpa_supplicant_update_scan_int(struct wpa_supplicant *wpa_s, int sec)
 905 {
 906         struct os_reltime remaining, new_int;
 907         int cancelled;
 908
 909         cancelled = eloop_cancel_timeout_one(wpa_supplicant_scan, wpa_s, NULL,
 910                                              &remaining);
 911
 912         new_int.sec = sec;
 913         new_int.usec = 0;
 914         if (cancelled && os_reltime_before(&remaining, &new_int)) {
 915                 new_int.sec = remaining.sec;
 916                 new_int.usec = remaining.usec;
 917         }
 918
 919         if (cancelled) {
 920                 eloop_register_timeout(new_int.sec, new_int.usec,
 921                                        wpa_supplicant_scan, wpa_s, NULL);
 922         }
 923         wpa_s->scan_interval = sec;
 924 }
 925
 926
 927 /**
 928  * wpa_supplicant_req_scan - Schedule a scan for neighboring access points
 929  * @wpa_s: Pointer to wpa_supplicant data
 930  * @sec: Number of seconds after which to scan
 931  * @usec: Number of microseconds after which to scan
 932  *
 933  * This function is used to schedule a scan for neighboring access points after
 934  * the specified time.
 935  */
 936 void wpa_supplicant_req_scan(struct wpa_supplicant *wpa_s, int sec, int usec)
 937 {
 938         int res = eloop_deplete_timeout(sec, usec, wpa_supplicant_scan, wpa_s,
 939                                         NULL);
 940         if (res == 1) {
 941                 wpa_dbg(wpa_s, MSG_DEBUG, "Rescheduling scan request: %d.%06d sec",
 942                         sec, usec);
 943         } else if (res == 0) {
 944                 wpa_dbg(wpa_s, MSG_DEBUG, "Ignore new scan request for %d.%06d sec since an earlier request is scheduled to trigger sooner",
 945                         sec, usec);
 946         } else {
 947                 wpa_dbg(wpa_s, MSG_DEBUG, "Setting scan request: %d.%06d sec",
 948                         sec, usec);
 949                 eloop_register_timeout(sec, usec, wpa_supplicant_scan, wpa_s, NULL);
 950         }
 951 }
 952
 953
 954 /**
 955  * wpa_supplicant_delayed_sched_scan - Request a delayed scheduled scan
 956  * @wpa_s: Pointer to wpa_supplicant data
 957  * @sec: Number of seconds after which to scan
 958  * @usec: Number of microseconds after which to scan
 959  * Returns: 0 on success or -1 otherwise
 960  *
 961  * This function is used to schedule periodic scans for neighboring
 962  * access points after the specified time.
 963  */
 964 int wpa_supplicant_delayed_sched_scan(struct wpa_supplicant *wpa_s,
 965                                       int sec, int usec)
 966 {
 967         if (!wpa_s->sched_scan_supported)
 968                 return -1;
 969
 970         eloop_register_timeout(sec, usec,
 971                                wpa_supplicant_delayed_sched_scan_timeout,
 972                                wpa_s, NULL);
 973
 974         return 0;
 975 }
 976
 977
 978 /**
 979  * wpa_supplicant_req_sched_scan - Start a periodic scheduled scan
 980  * @wpa_s: Pointer to wpa_supplicant data
 981  * Returns: 0 is sched_scan was started or -1 otherwise
 982  *
 983  * This function is used to schedule periodic scans for neighboring
 984  * access points repeating the scan continuously.
 985  */
 986 int wpa_supplicant_req_sched_scan(struct wpa_supplicant *wpa_s)
 987 {
 988         struct wpa_driver_scan_params params;
 989         struct wpa_driver_scan_params *scan_params;
 990         enum wpa_states prev_state;
 991         struct wpa_ssid *ssid = NULL;
 992         struct wpabuf *extra_ie = NULL;
 993         int ret;
 994         unsigned int max_sched_scan_ssids;
 995         int wildcard = 0;
 996         int need_ssids;
 997
 998         if (!wpa_s->sched_scan_supported)
 999                 return -1;
1000
1001         if (wpa_s->max_sched_scan_ssids > WPAS_MAX_SCAN_SSIDS)
1002                 max_sched_scan_ssids = WPAS_MAX_SCAN_SSIDS;
1003         else
1004                 max_sched_scan_ssids = wpa_s->max_sched_scan_ssids;
1005         if (max_sched_scan_ssids < 1 || wpa_s->conf->disable_scan_offload)
1006                 return -1;
1007
1008         if (wpa_s->sched_scanning) {
1009                 wpa_dbg(wpa_s, MSG_DEBUG, "Already sched scanning");
1010                 return 0;
1011         }
1012
1013         need_ssids = 0;
1014         for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
1015                 if (!wpas_network_disabled(wpa_s, ssid) && !ssid->scan_ssid) {
1016                         /* Use wildcard SSID to find this network */
1017                         wildcard = 1;
1018                 } else if (!wpas_network_disabled(wpa_s, ssid) &&
1019                            ssid->ssid_len)
1020                         need_ssids++;
1021
1022 #ifdef CONFIG_WPS
1023                 if (!wpas_network_disabled(wpa_s, ssid) &&
1024                     ssid->key_mgmt == WPA_KEY_MGMT_WPS) {
1025                         /*
1026                          * Normal scan is more reliable and faster for WPS
1027                          * operations and since these are for short periods of
1028                          * time, the benefit of trying to use sched_scan would
1029                          * be limited.
1030                          */
1031                         wpa_dbg(wpa_s, MSG_DEBUG, "Use normal scan instead of "
1032                                 "sched_scan for WPS");
1033                         return -1;
1034                 }
1035 #endif /* CONFIG_WPS */
1036         }
1037         if (wildcard)
1038                 need_ssids++;
1039
1040         if (wpa_s->normal_scans < 3 &&
1041             (need_ssids <= wpa_s->max_scan_ssids ||
1042              wpa_s->max_scan_ssids >= (int) max_sched_scan_ssids)) {
1043                 /*
1044                  * When normal scan can speed up operations, use that for the
1045                  * first operations before starting the sched_scan to allow
1046                  * user space sleep more. We do this only if the normal scan
1047                  * has functionality that is suitable for this or if the
1048                  * sched_scan does not have better support for multiple SSIDs.
1049                  */
1050                 wpa_dbg(wpa_s, MSG_DEBUG, "Use normal scan instead of "
1051                         "sched_scan for initial scans (normal_scans=%d)",
1052                         wpa_s->normal_scans);
1053                 return -1;
1054         }
1055
1056         os_memset(&params, 0, sizeof(params));
1057
1058         /* If we can't allocate space for the filters, we just don't filter */
1059         params.filter_ssids = os_zalloc(wpa_s->max_match_sets *
1060                                         sizeof(struct wpa_driver_scan_filter));
1061
1062         prev_state = wpa_s->wpa_state;
1063         if (wpa_s->wpa_state == WPA_DISCONNECTED ||
1064             wpa_s->wpa_state == WPA_INACTIVE)
1065                 wpa_supplicant_set_state(wpa_s, WPA_SCANNING);
1066
1067         if (wpa_s->autoscan_params != NULL) {
1068                 scan_params = wpa_s->autoscan_params;
1069                 goto scan;
1070         }
1071
1072         /* Find the starting point from which to continue scanning */
1073         ssid = wpa_s->conf->ssid;
1074         if (wpa_s->prev_sched_ssid) {
1075                 while (ssid) {
1076                         if (ssid == wpa_s->prev_sched_ssid) {
1077                                 ssid = ssid->next;
1078                                 break;
1079                         }
1080                         ssid = ssid->next;
1081                 }
1082         }
1083
1084         if (!ssid || !wpa_s->prev_sched_ssid) {
1085                 wpa_dbg(wpa_s, MSG_DEBUG, "Beginning of SSID list");
1086                 if (wpa_s->conf->sched_scan_interval)
1087                         wpa_s->sched_scan_interval =
1088                                 wpa_s->conf->sched_scan_interval;
1089                 if (wpa_s->sched_scan_interval == 0)
1090                         wpa_s->sched_scan_interval = 10;
1091                 wpa_s->sched_scan_timeout = max_sched_scan_ssids * 2;
1092                 wpa_s->first_sched_scan = 1;
1093                 ssid = wpa_s->conf->ssid;
1094                 wpa_s->prev_sched_ssid = ssid;
1095         }
1096
1097         if (wildcard) {
1098                 wpa_dbg(wpa_s, MSG_DEBUG, "Add wildcard SSID to sched_scan");
1099                 params.num_ssids++;
1100         }
1101
1102         while (ssid) {
1103                 if (wpas_network_disabled(wpa_s, ssid))
1104                         goto next;
1105
1106                 if (params.num_filter_ssids < wpa_s->max_match_sets &&
1107                     params.filter_ssids && ssid->ssid && ssid->ssid_len) {
1108                         wpa_dbg(wpa_s, MSG_DEBUG, "add to filter ssid: %s",
1109                                 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
1110                         os_memcpy(params.filter_ssids[params.num_filter_ssids].ssid,
1111                                   ssid->ssid, ssid->ssid_len);
1112                         params.filter_ssids[params.num_filter_ssids].ssid_len =
1113                                 ssid->ssid_len;
1114                         params.num_filter_ssids++;
1115                 } else if (params.filter_ssids && ssid->ssid && ssid->ssid_len)
1116                 {
1117                         wpa_dbg(wpa_s, MSG_DEBUG, "Not enough room for SSID "
1118                                 "filter for sched_scan - drop filter");
1119                         os_free(params.filter_ssids);
1120                         params.filter_ssids = NULL;
1121                         params.num_filter_ssids = 0;
1122                 }
1123
1124                 if (ssid->scan_ssid && ssid->ssid && ssid->ssid_len) {
1125                         if (params.num_ssids == max_sched_scan_ssids)
1126                                 break; /* only room for broadcast SSID */
1127                         wpa_dbg(wpa_s, MSG_DEBUG,
1128                                 "add to active scan ssid: %s",
1129                                 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
1130                         params.ssids[params.num_ssids].ssid =
1131                                 ssid->ssid;
1132                         params.ssids[params.num_ssids].ssid_len =
1133                                 ssid->ssid_len;
1134                         params.num_ssids++;
1135                         if (params.num_ssids >= max_sched_scan_ssids) {
1136                                 wpa_s->prev_sched_ssid = ssid;
1137                                 do {
1138                                         ssid = ssid->next;
1139                                 } while (ssid &&
1140                                          (wpas_network_disabled(wpa_s, ssid) ||
1141                                           !ssid->scan_ssid));
1142                                 break;
1143                         }
1144                 }
1145
1146         next:
1147                 wpa_s->prev_sched_ssid = ssid;
1148                 ssid = ssid->next;
1149         }
1150
1151         if (params.num_filter_ssids == 0) {
1152                 os_free(params.filter_ssids);
1153                 params.filter_ssids = NULL;
1154         }
1155
1156         extra_ie = wpa_supplicant_extra_ies(wpa_s);
1157         if (extra_ie) {
1158                 params.extra_ies = wpabuf_head(extra_ie);
1159                 params.extra_ies_len = wpabuf_len(extra_ie);
1160         }
1161
1162         if (wpa_s->conf->filter_rssi)
1163                 params.filter_rssi = wpa_s->conf->filter_rssi;
1164
1165         scan_params = &params;
1166
1167 scan:
1168         if (ssid || !wpa_s->first_sched_scan) {
1169                 wpa_dbg(wpa_s, MSG_DEBUG,
1170                         "Starting sched scan: interval %d timeout %d",
1171                         wpa_s->sched_scan_interval, wpa_s->sched_scan_timeout);
1172         } else {
1173                 wpa_dbg(wpa_s, MSG_DEBUG,
1174                         "Starting sched scan: interval %d (no timeout)",
1175                         wpa_s->sched_scan_interval);
1176         }
1177
1178         wpa_setband_scan_freqs(wpa_s, scan_params);
1179
1180         ret = wpa_supplicant_start_sched_scan(wpa_s, scan_params,
1181                                               wpa_s->sched_scan_interval);
1182         wpabuf_free(extra_ie);
1183         os_free(params.filter_ssids);
1184         if (ret) {
1185                 wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate sched scan");
1186                 if (prev_state != wpa_s->wpa_state)
1187                         wpa_supplicant_set_state(wpa_s, prev_state);
1188                 return ret;
1189         }
1190
1191         /* If we have more SSIDs to scan, add a timeout so we scan them too */
1192         if (ssid || !wpa_s->first_sched_scan) {
1193                 wpa_s->sched_scan_timed_out = 0;
1194                 eloop_register_timeout(wpa_s->sched_scan_timeout, 0,
1195                                        wpa_supplicant_sched_scan_timeout,
1196                                        wpa_s, NULL);
1197                 wpa_s->first_sched_scan = 0;
1198                 wpa_s->sched_scan_timeout /= 2;
1199                 wpa_s->sched_scan_interval *= 2;
1200                 if (wpa_s->sched_scan_timeout < wpa_s->sched_scan_interval) {
1201                         wpa_s->sched_scan_interval = 10;
1202                         wpa_s->sched_scan_timeout = max_sched_scan_ssids * 2;
1203                 }
1204         }
1205
1206         /* If there is no more ssids, start next time from the beginning */
1207         if (!ssid)
1208                 wpa_s->prev_sched_ssid = NULL;
1209
1210         return 0;
1211 }
1212
1213
1214 /**
1215  * wpa_supplicant_cancel_scan - Cancel a scheduled scan request
1216  * @wpa_s: Pointer to wpa_supplicant data
1217  *
1218  * This function is used to cancel a scan request scheduled with
1219  * wpa_supplicant_req_scan().
1220  */
1221 void wpa_supplicant_cancel_scan(struct wpa_supplicant *wpa_s)
1222 {
1223         wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling scan request");
1224         eloop_cancel_timeout(wpa_supplicant_scan, wpa_s, NULL);
1225 }
1226
1227
1228 /**
1229  * wpa_supplicant_cancel_delayed_sched_scan - Stop a delayed scheduled scan
1230  * @wpa_s: Pointer to wpa_supplicant data
1231  *
1232  * This function is used to stop a delayed scheduled scan.
1233  */
1234 void wpa_supplicant_cancel_delayed_sched_scan(struct wpa_supplicant *wpa_s)
1235 {
1236         if (!wpa_s->sched_scan_supported)
1237                 return;
1238
1239         wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling delayed sched scan");
1240         eloop_cancel_timeout(wpa_supplicant_delayed_sched_scan_timeout,
1241                              wpa_s, NULL);
1242 }
1243
1244
1245 /**
1246  * wpa_supplicant_cancel_sched_scan - Stop running scheduled scans
1247  * @wpa_s: Pointer to wpa_supplicant data
1248  *
1249  * This function is used to stop a periodic scheduled scan.
1250  */
1251 void wpa_supplicant_cancel_sched_scan(struct wpa_supplicant *wpa_s)
1252 {
1253         if (!wpa_s->sched_scanning)
1254                 return;
1255
1256         wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling sched scan");
1257         eloop_cancel_timeout(wpa_supplicant_sched_scan_timeout, wpa_s, NULL);
1258         wpa_supplicant_stop_sched_scan(wpa_s);
1259 }
1260
1261
1262 /**
1263  * wpa_supplicant_notify_scanning - Indicate possible scan state change
1264  * @wpa_s: Pointer to wpa_supplicant data
1265  * @scanning: Whether scanning is currently in progress
1266  *
1267  * This function is to generate scanning notifycations. It is called whenever
1268  * there may have been a change in scanning (scan started, completed, stopped).
1269  * wpas_notify_scanning() is called whenever the scanning state changed from the
1270  * previously notified state.
1271  */
1272 void wpa_supplicant_notify_scanning(struct wpa_supplicant *wpa_s,
1273                                     int scanning)
1274 {
1275         if (wpa_s->scanning != scanning) {
1276                 wpa_s->scanning = scanning;
1277                 wpas_notify_scanning(wpa_s);
1278         }
1279 }
1280
1281
1282 static int wpa_scan_get_max_rate(const struct wpa_scan_res *res)
1283 {
1284         int rate = 0;
1285         const u8 *ie;
1286         int i;
1287
1288         ie = wpa_scan_get_ie(res, WLAN_EID_SUPP_RATES);
1289         for (i = 0; ie && i < ie[1]; i++) {
1290                 if ((ie[i + 2] & 0x7f) > rate)
1291                         rate = ie[i + 2] & 0x7f;
1292         }
1293
1294         ie = wpa_scan_get_ie(res, WLAN_EID_EXT_SUPP_RATES);
1295         for (i = 0; ie && i < ie[1]; i++) {
1296                 if ((ie[i + 2] & 0x7f) > rate)
1297                         rate = ie[i + 2] & 0x7f;
1298         }
1299
1300         return rate;
1301 }
1302
1303
1304 /**
1305  * wpa_scan_get_ie - Fetch a specified information element from a scan result
1306  * @res: Scan result entry
1307  * @ie: Information element identitifier (WLAN_EID_*)
1308  * Returns: Pointer to the information element (id field) or %NULL if not found
1309  *
1310  * This function returns the first matching information element in the scan
1311  * result.
1312  */
1313 const u8 * wpa_scan_get_ie(const struct wpa_scan_res *res, u8 ie)
1314 {
1315         const u8 *end, *pos;
1316
1317         pos = (const u8 *) (res + 1);
1318         end = pos + res->ie_len;
1319
1320         while (pos + 1 < end) {
1321                 if (pos + 2 + pos[1] > end)
1322                         break;
1323                 if (pos[0] == ie)
1324                         return pos;
1325                 pos += 2 + pos[1];
1326         }
1327
1328         return NULL;
1329 }
1330
1331
1332 /**
1333  * wpa_scan_get_vendor_ie - Fetch vendor information element from a scan result
1334  * @res: Scan result entry
1335  * @vendor_type: Vendor type (four octets starting the IE payload)
1336  * Returns: Pointer to the information element (id field) or %NULL if not found
1337  *
1338  * This function returns the first matching information element in the scan
1339  * result.
1340  */
1341 const u8 * wpa_scan_get_vendor_ie(const struct wpa_scan_res *res,
1342                                   u32 vendor_type)
1343 {
1344         const u8 *end, *pos;
1345
1346         pos = (const u8 *) (res + 1);
1347         end = pos + res->ie_len;
1348
1349         while (pos + 1 < end) {
1350                 if (pos + 2 + pos[1] > end)
1351                         break;
1352                 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1353                     vendor_type == WPA_GET_BE32(&pos[2]))
1354                         return pos;
1355                 pos += 2 + pos[1];
1356         }
1357
1358         return NULL;
1359 }
1360
1361
1362 /**
1363  * wpa_scan_get_vendor_ie_beacon - Fetch vendor information from a scan result
1364  * @res: Scan result entry
1365  * @vendor_type: Vendor type (four octets starting the IE payload)
1366  * Returns: Pointer to the information element (id field) or %NULL if not found
1367  *
1368  * This function returns the first matching information element in the scan
1369  * result.
1370  *
1371  * This function is like wpa_scan_get_vendor_ie(), but uses IE buffer only
1372  * from Beacon frames instead of either Beacon or Probe Response frames.
1373  */
1374 const u8 * wpa_scan_get_vendor_ie_beacon(const struct wpa_scan_res *res,
1375                                          u32 vendor_type)
1376 {
1377         const u8 *end, *pos;
1378
1379         if (res->beacon_ie_len == 0)
1380                 return NULL;
1381
1382         pos = (const u8 *) (res + 1);
1383         pos += res->ie_len;
1384         end = pos + res->beacon_ie_len;
1385
1386         while (pos + 1 < end) {
1387                 if (pos + 2 + pos[1] > end)
1388                         break;
1389                 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1390                     vendor_type == WPA_GET_BE32(&pos[2]))
1391                         return pos;
1392                 pos += 2 + pos[1];
1393         }
1394
1395         return NULL;
1396 }
1397
1398
1399 /**
1400  * wpa_scan_get_vendor_ie_multi - Fetch vendor IE data from a scan result
1401  * @res: Scan result entry
1402  * @vendor_type: Vendor type (four octets starting the IE payload)
1403  * Returns: Pointer to the information element payload or %NULL if not found
1404  *
1405  * This function returns concatenated payload of possibly fragmented vendor
1406  * specific information elements in the scan result. The caller is responsible
1407  * for freeing the returned buffer.
1408  */
1409 struct wpabuf * wpa_scan_get_vendor_ie_multi(const struct wpa_scan_res *res,
1410                                              u32 vendor_type)
1411 {
1412         struct wpabuf *buf;
1413         const u8 *end, *pos;
1414
1415         buf = wpabuf_alloc(res->ie_len);
1416         if (buf == NULL)
1417                 return NULL;
1418
1419         pos = (const u8 *) (res + 1);
1420         end = pos + res->ie_len;
1421
1422         while (pos + 1 < end) {
1423                 if (pos + 2 + pos[1] > end)
1424                         break;
1425                 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1426                     vendor_type == WPA_GET_BE32(&pos[2]))
1427                         wpabuf_put_data(buf, pos + 2 + 4, pos[1] - 4);
1428                 pos += 2 + pos[1];
1429         }
1430
1431         if (wpabuf_len(buf) == 0) {
1432                 wpabuf_free(buf);
1433                 buf = NULL;
1434         }
1435
1436         return buf;
1437 }
1438
1439
1440 /*
1441  * Channels with a great SNR can operate at full rate. What is a great SNR?
1442  * This doc https://supportforums.cisco.com/docs/DOC-12954 says, "the general
1443  * rule of thumb is that any SNR above 20 is good." This one
1444  * http://www.cisco.com/en/US/tech/tk722/tk809/technologies_q_and_a_item09186a00805e9a96.shtml#qa23
1445  * recommends 25 as a minimum SNR for 54 Mbps data rate. 30 is chosen here as a
1446  * conservative value.
1447  */
1448 #define GREAT_SNR 30
1449
1450 /* Compare function for sorting scan results. Return >0 if @b is considered
1451  * better. */
1452 static int wpa_scan_result_compar(const void *a, const void *b)
1453 {
1454 #define IS_5GHZ(n) (n > 4000)
1455 #define MIN(a,b) a < b ? a : b
1456         struct wpa_scan_res **_wa = (void *) a;
1457         struct wpa_scan_res **_wb = (void *) b;
1458         struct wpa_scan_res *wa = *_wa;
1459         struct wpa_scan_res *wb = *_wb;
1460         int wpa_a, wpa_b, maxrate_a, maxrate_b;
1461         int snr_a, snr_b;
1462
1463         /* WPA/WPA2 support preferred */
1464         wpa_a = wpa_scan_get_vendor_ie(wa, WPA_IE_VENDOR_TYPE) != NULL ||
1465                 wpa_scan_get_ie(wa, WLAN_EID_RSN) != NULL;
1466         wpa_b = wpa_scan_get_vendor_ie(wb, WPA_IE_VENDOR_TYPE) != NULL ||
1467                 wpa_scan_get_ie(wb, WLAN_EID_RSN) != NULL;
1468
1469         if (wpa_b && !wpa_a)
1470                 return 1;
1471         if (!wpa_b && wpa_a)
1472                 return -1;
1473
1474         /* privacy support preferred */
1475         if ((wa->caps & IEEE80211_CAP_PRIVACY) == 0 &&
1476             (wb->caps & IEEE80211_CAP_PRIVACY))
1477                 return 1;
1478         if ((wa->caps & IEEE80211_CAP_PRIVACY) &&
1479             (wb->caps & IEEE80211_CAP_PRIVACY) == 0)
1480                 return -1;
1481
1482         if ((wa->flags & wb->flags & WPA_SCAN_LEVEL_DBM) &&
1483             !((wa->flags | wb->flags) & WPA_SCAN_NOISE_INVALID)) {
1484                 snr_a = MIN(wa->level - wa->noise, GREAT_SNR);
1485                 snr_b = MIN(wb->level - wb->noise, GREAT_SNR);
1486         } else {
1487                 /* Not suitable information to calculate SNR, so use level */
1488                 snr_a = wa->level;
1489                 snr_b = wb->level;
1490         }
1491
1492         /* best/max rate preferred if SNR close enough */
1493         if ((snr_a && snr_b && abs(snr_b - snr_a) < 5) ||
1494             (wa->qual && wb->qual && abs(wb->qual - wa->qual) < 10)) {
1495                 maxrate_a = wpa_scan_get_max_rate(wa);
1496                 maxrate_b = wpa_scan_get_max_rate(wb);
1497                 if (maxrate_a != maxrate_b)
1498                         return maxrate_b - maxrate_a;
1499                 if (IS_5GHZ(wa->freq) ^ IS_5GHZ(wb->freq))
1500                         return IS_5GHZ(wa->freq) ? -1 : 1;
1501         }
1502
1503         /* use freq for channel preference */
1504
1505         /* all things being equal, use SNR; if SNRs are
1506          * identical, use quality values since some drivers may only report
1507          * that value and leave the signal level zero */
1508         if (snr_b == snr_a)
1509                 return wb->qual - wa->qual;
1510         return snr_b - snr_a;
1511 #undef MIN
1512 #undef IS_5GHZ
1513 }
1514
1515
1516 #ifdef CONFIG_WPS
1517 /* Compare function for sorting scan results when searching a WPS AP for
1518  * provisioning. Return >0 if @b is considered better. */
1519 static int wpa_scan_result_wps_compar(const void *a, const void *b)
1520 {
1521         struct wpa_scan_res **_wa = (void *) a;
1522         struct wpa_scan_res **_wb = (void *) b;
1523         struct wpa_scan_res *wa = *_wa;
1524         struct wpa_scan_res *wb = *_wb;
1525         int uses_wps_a, uses_wps_b;
1526         struct wpabuf *wps_a, *wps_b;
1527         int res;
1528
1529         /* Optimization - check WPS IE existence before allocated memory and
1530          * doing full reassembly. */
1531         uses_wps_a = wpa_scan_get_vendor_ie(wa, WPS_IE_VENDOR_TYPE) != NULL;
1532         uses_wps_b = wpa_scan_get_vendor_ie(wb, WPS_IE_VENDOR_TYPE) != NULL;
1533         if (uses_wps_a && !uses_wps_b)
1534                 return -1;
1535         if (!uses_wps_a && uses_wps_b)
1536                 return 1;
1537
1538         if (uses_wps_a && uses_wps_b) {
1539                 wps_a = wpa_scan_get_vendor_ie_multi(wa, WPS_IE_VENDOR_TYPE);
1540                 wps_b = wpa_scan_get_vendor_ie_multi(wb, WPS_IE_VENDOR_TYPE);
1541                 res = wps_ap_priority_compar(wps_a, wps_b);
1542                 wpabuf_free(wps_a);
1543                 wpabuf_free(wps_b);
1544                 if (res)
1545                         return res;
1546         }
1547
1548         /*
1549          * Do not use current AP security policy as a sorting criteria during
1550          * WPS provisioning step since the AP may get reconfigured at the
1551          * completion of provisioning.
1552          */
1553
1554         /* all things being equal, use signal level; if signal levels are
1555          * identical, use quality values since some drivers may only report
1556          * that value and leave the signal level zero */
1557         if (wb->level == wa->level)
1558                 return wb->qual - wa->qual;
1559         return wb->level - wa->level;
1560 }
1561 #endif /* CONFIG_WPS */
1562
1563
1564 static void dump_scan_res(struct wpa_scan_results *scan_res)
1565 {
1566 #ifndef CONFIG_NO_STDOUT_DEBUG
1567         size_t i;
1568
1569         if (scan_res->res == NULL || scan_res->num == 0)
1570                 return;
1571
1572         wpa_printf(MSG_EXCESSIVE, "Sorted scan results");
1573
1574         for (i = 0; i < scan_res->num; i++) {
1575                 struct wpa_scan_res *r = scan_res->res[i];
1576                 u8 *pos;
1577                 if ((r->flags & (WPA_SCAN_LEVEL_DBM | WPA_SCAN_NOISE_INVALID))
1578                     == WPA_SCAN_LEVEL_DBM) {
1579                         int snr = r->level - r->noise;
1580                         wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d "
1581                                    "noise=%d level=%d snr=%d%s flags=0x%x "
1582                                    "age=%u",
1583                                    MAC2STR(r->bssid), r->freq, r->qual,
1584                                    r->noise, r->level, snr,
1585                                    snr >= GREAT_SNR ? "*" : "", r->flags,
1586                                    r->age);
1587                 } else {
1588                         wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d "
1589                                    "noise=%d level=%d flags=0x%x age=%u",
1590                                    MAC2STR(r->bssid), r->freq, r->qual,
1591                                    r->noise, r->level, r->flags, r->age);
1592                 }
1593                 pos = (u8 *) (r + 1);
1594                 if (r->ie_len)
1595                         wpa_hexdump(MSG_EXCESSIVE, "IEs", pos, r->ie_len);
1596                 pos += r->ie_len;
1597                 if (r->beacon_ie_len)
1598                         wpa_hexdump(MSG_EXCESSIVE, "Beacon IEs",
1599                                     pos, r->beacon_ie_len);
1600         }
1601 #endif /* CONFIG_NO_STDOUT_DEBUG */
1602 }
1603
1604
1605 /**
1606  * wpa_supplicant_filter_bssid_match - Is the specified BSSID allowed
1607  * @wpa_s: Pointer to wpa_supplicant data
1608  * @bssid: BSSID to check
1609  * Returns: 0 if the BSSID is filtered or 1 if not
1610  *
1611  * This function is used to filter out specific BSSIDs from scan reslts mainly
1612  * for testing purposes (SET bssid_filter ctrl_iface command).
1613  */
1614 int wpa_supplicant_filter_bssid_match(struct wpa_supplicant *wpa_s,
1615                                       const u8 *bssid)
1616 {
1617         size_t i;
1618
1619         if (wpa_s->bssid_filter == NULL)
1620                 return 1;
1621
1622         for (i = 0; i < wpa_s->bssid_filter_count; i++) {
1623                 if (os_memcmp(wpa_s->bssid_filter + i * ETH_ALEN, bssid,
1624                               ETH_ALEN) == 0)
1625                         return 1;
1626         }
1627
1628         return 0;
1629 }
1630
1631
1632 static void filter_scan_res(struct wpa_supplicant *wpa_s,
1633                             struct wpa_scan_results *res)
1634 {
1635         size_t i, j;
1636
1637         if (wpa_s->bssid_filter == NULL)
1638                 return;
1639
1640         for (i = 0, j = 0; i < res->num; i++) {
1641                 if (wpa_supplicant_filter_bssid_match(wpa_s,
1642                                                       res->res[i]->bssid)) {
1643                         res->res[j++] = res->res[i];
1644                 } else {
1645                         os_free(res->res[i]);
1646                         res->res[i] = NULL;
1647                 }
1648         }
1649
1650         if (res->num != j) {
1651                 wpa_printf(MSG_DEBUG, "Filtered out %d scan results",
1652                            (int) (res->num - j));
1653                 res->num = j;
1654         }
1655 }
1656
1657
1658 /**
1659  * wpa_supplicant_get_scan_results - Get scan results
1660  * @wpa_s: Pointer to wpa_supplicant data
1661  * @info: Information about what was scanned or %NULL if not available
1662  * @new_scan: Whether a new scan was performed
1663  * Returns: Scan results, %NULL on failure
1664  *
1665  * This function request the current scan results from the driver and updates
1666  * the local BSS list wpa_s->bss. The caller is responsible for freeing the
1667  * results with wpa_scan_results_free().
1668  */
1669 struct wpa_scan_results *
1670 wpa_supplicant_get_scan_results(struct wpa_supplicant *wpa_s,
1671                                 struct scan_info *info, int new_scan)
1672 {
1673         struct wpa_scan_results *scan_res;
1674         size_t i;
1675         int (*compar)(const void *, const void *) = wpa_scan_result_compar;
1676
1677         scan_res = wpa_drv_get_scan_results2(wpa_s);
1678         if (scan_res == NULL) {
1679                 wpa_dbg(wpa_s, MSG_DEBUG, "Failed to get scan results");
1680                 return NULL;
1681         }
1682         if (scan_res->fetch_time.sec == 0) {
1683                 /*
1684                  * Make sure we have a valid timestamp if the driver wrapper
1685                  * does not set this.
1686                  */
1687                 os_get_reltime(&scan_res->fetch_time);
1688         }
1689         filter_scan_res(wpa_s, scan_res);
1690
1691 #ifdef CONFIG_WPS
1692         if (wpas_wps_searching(wpa_s)) {
1693                 wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Order scan results with WPS "
1694                         "provisioning rules");
1695                 compar = wpa_scan_result_wps_compar;
1696         }
1697 #endif /* CONFIG_WPS */
1698
1699         qsort(scan_res->res, scan_res->num, sizeof(struct wpa_scan_res *),
1700               compar);
1701         dump_scan_res(scan_res);
1702
1703         wpa_bss_update_start(wpa_s);
1704         for (i = 0; i < scan_res->num; i++)
1705                 wpa_bss_update_scan_res(wpa_s, scan_res->res[i],
1706                                         &scan_res->fetch_time);
1707         wpa_bss_update_end(wpa_s, info, new_scan);
1708
1709         return scan_res;
1710 }
1711
1712
1713 /**
1714  * wpa_supplicant_update_scan_results - Update scan results from the driver
1715  * @wpa_s: Pointer to wpa_supplicant data
1716  * Returns: 0 on success, -1 on failure
1717  *
1718  * This function updates the BSS table within wpa_supplicant based on the
1719  * currently available scan results from the driver without requesting a new
1720  * scan. This is used in cases where the driver indicates an association
1721  * (including roaming within ESS) and wpa_supplicant does not yet have the
1722  * needed information to complete the connection (e.g., to perform validation
1723  * steps in 4-way handshake).
1724  */
1725 int wpa_supplicant_update_scan_results(struct wpa_supplicant *wpa_s)
1726 {
1727         struct wpa_scan_results *scan_res;
1728         scan_res = wpa_supplicant_get_scan_results(wpa_s, NULL, 0);
1729         if (scan_res == NULL)
1730                 return -1;
1731         wpa_scan_results_free(scan_res);
1732
1733         return 0;
1734 }
1735
1736
1737 /**
1738  * scan_only_handler - Reports scan results
1739  */
1740 void scan_only_handler(struct wpa_supplicant *wpa_s,
1741                        struct wpa_scan_results *scan_res)
1742 {
1743         wpa_dbg(wpa_s, MSG_DEBUG, "Scan-only results received");
1744         if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
1745             wpa_s->manual_scan_use_id && wpa_s->own_scan_running) {
1746                 wpa_msg_ctrl(wpa_s, MSG_INFO, WPA_EVENT_SCAN_RESULTS "id=%u",
1747                              wpa_s->manual_scan_id);
1748                 wpa_s->manual_scan_use_id = 0;
1749         } else {
1750                 wpa_msg_ctrl(wpa_s, MSG_INFO, WPA_EVENT_SCAN_RESULTS);
1751         }
1752         wpas_notify_scan_results(wpa_s);
1753         wpas_notify_scan_done(wpa_s, 1);
1754         if (wpa_s->scan_work) {
1755                 struct wpa_radio_work *work = wpa_s->scan_work;
1756                 wpa_s->scan_work = NULL;
1757                 radio_work_done(work);
1758         }
1759 }
1760
1761
1762 int wpas_scan_scheduled(struct wpa_supplicant *wpa_s)
1763 {
1764         return eloop_is_timeout_registered(wpa_supplicant_scan, wpa_s, NULL);
1765 }
1766
1767
1768 struct wpa_driver_scan_params *
1769 wpa_scan_clone_params(const struct wpa_driver_scan_params *src)
1770 {
1771         struct wpa_driver_scan_params *params;
1772         size_t i;
1773         u8 *n;
1774
1775         params = os_zalloc(sizeof(*params));
1776         if (params == NULL)
1777                 return NULL;
1778
1779         for (i = 0; i < src->num_ssids; i++) {
1780                 if (src->ssids[i].ssid) {
1781                         n = os_malloc(src->ssids[i].ssid_len);
1782                         if (n == NULL)
1783                                 goto failed;
1784                         os_memcpy(n, src->ssids[i].ssid,
1785                                   src->ssids[i].ssid_len);
1786                         params->ssids[i].ssid = n;
1787                         params->ssids[i].ssid_len = src->ssids[i].ssid_len;
1788                 }
1789         }
1790         params->num_ssids = src->num_ssids;
1791
1792         if (src->extra_ies) {
1793                 n = os_malloc(src->extra_ies_len);
1794                 if (n == NULL)
1795                         goto failed;
1796                 os_memcpy(n, src->extra_ies, src->extra_ies_len);
1797                 params->extra_ies = n;
1798                 params->extra_ies_len = src->extra_ies_len;
1799         }
1800
1801         if (src->freqs) {
1802                 int len = int_array_len(src->freqs);
1803                 params->freqs = os_malloc((len + 1) * sizeof(int));
1804                 if (params->freqs == NULL)
1805                         goto failed;
1806                 os_memcpy(params->freqs, src->freqs, (len + 1) * sizeof(int));
1807         }
1808
1809         if (src->filter_ssids) {
1810                 params->filter_ssids = os_malloc(sizeof(*params->filter_ssids) *
1811                                                  src->num_filter_ssids);
1812                 if (params->filter_ssids == NULL)
1813                         goto failed;
1814                 os_memcpy(params->filter_ssids, src->filter_ssids,
1815                           sizeof(*params->filter_ssids) *
1816                           src->num_filter_ssids);
1817                 params->num_filter_ssids = src->num_filter_ssids;
1818         }
1819
1820         params->filter_rssi = src->filter_rssi;
1821         params->p2p_probe = src->p2p_probe;
1822         params->only_new_results = src->only_new_results;
1823
1824         return params;
1825
1826 failed:
1827         wpa_scan_free_params(params);
1828         return NULL;
1829 }
1830
1831
1832 void wpa_scan_free_params(struct wpa_driver_scan_params *params)
1833 {
1834         size_t i;
1835
1836         if (params == NULL)
1837                 return;
1838
1839         for (i = 0; i < params->num_ssids; i++)
1840                 os_free((u8 *) params->ssids[i].ssid);
1841         os_free((u8 *) params->extra_ies);
1842         os_free(params->freqs);
1843         os_free(params->filter_ssids);
1844         os_free(params);
1845 }
1846
1847
1848 int wpas_start_pno(struct wpa_supplicant *wpa_s)
1849 {
1850         int ret, interval;
1851         size_t i, num_ssid;
1852         struct wpa_ssid *ssid;
1853         struct wpa_driver_scan_params params;
1854
1855         if (!wpa_s->sched_scan_supported)
1856                 return -1;
1857
1858         if (wpa_s->pno || wpa_s->pno_sched_pending)
1859                 return 0;
1860
1861         if ((wpa_s->wpa_state > WPA_SCANNING) &&
1862             (wpa_s->wpa_state <= WPA_COMPLETED)) {
1863                 wpa_printf(MSG_ERROR, "PNO: In assoc process");
1864                 return -EAGAIN;
1865         }
1866
1867         if (wpa_s->wpa_state == WPA_SCANNING) {
1868                 wpa_supplicant_cancel_scan(wpa_s);
1869                 if (wpa_s->sched_scanning) {
1870                         wpa_printf(MSG_DEBUG, "Schedule PNO on completion of "
1871                                    "ongoing sched scan");
1872                         wpa_supplicant_cancel_sched_scan(wpa_s);
1873                         wpa_s->pno_sched_pending = 1;
1874                         return 0;
1875                 }
1876         }
1877
1878         os_memset(&params, 0, sizeof(params));
1879
1880         num_ssid = 0;
1881         ssid = wpa_s->conf->ssid;
1882         while (ssid) {
1883                 if (!wpas_network_disabled(wpa_s, ssid))
1884                         num_ssid++;
1885                 ssid = ssid->next;
1886         }
1887         if (num_ssid > WPAS_MAX_SCAN_SSIDS) {
1888                 wpa_printf(MSG_DEBUG, "PNO: Use only the first %u SSIDs from "
1889                            "%u", WPAS_MAX_SCAN_SSIDS, (unsigned int) num_ssid);
1890                 num_ssid = WPAS_MAX_SCAN_SSIDS;
1891         }
1892
1893         if (num_ssid == 0) {
1894                 wpa_printf(MSG_DEBUG, "PNO: No configured SSIDs");
1895                 return -1;
1896         }
1897
1898         params.filter_ssids = os_malloc(sizeof(struct wpa_driver_scan_filter) *
1899                                         num_ssid);
1900         if (params.filter_ssids == NULL)
1901                 return -1;
1902         i = 0;
1903         ssid = wpa_s->conf->ssid;
1904         while (ssid) {
1905                 if (!wpas_network_disabled(wpa_s, ssid)) {
1906                         params.ssids[i].ssid = ssid->ssid;
1907                         params.ssids[i].ssid_len = ssid->ssid_len;
1908                         params.num_ssids++;
1909                         os_memcpy(params.filter_ssids[i].ssid, ssid->ssid,
1910                                   ssid->ssid_len);
1911                         params.filter_ssids[i].ssid_len = ssid->ssid_len;
1912                         params.num_filter_ssids++;
1913                         i++;
1914                         if (i == num_ssid)
1915                                 break;
1916                 }
1917                 ssid = ssid->next;
1918         }
1919
1920         if (wpa_s->conf->filter_rssi)
1921                 params.filter_rssi = wpa_s->conf->filter_rssi;
1922
1923         interval = wpa_s->conf->sched_scan_interval ?
1924                 wpa_s->conf->sched_scan_interval : 10;
1925
1926         ret = wpa_supplicant_start_sched_scan(wpa_s, &params, interval);
1927         os_free(params.filter_ssids);
1928         if (ret == 0)
1929                 wpa_s->pno = 1;
1930         else
1931                 wpa_msg(wpa_s, MSG_ERROR, "Failed to schedule PNO");
1932         return ret;
1933 }
1934
1935
1936 int wpas_stop_pno(struct wpa_supplicant *wpa_s)
1937 {
1938         int ret = 0;
1939
1940         if (!wpa_s->pno)
1941                 return 0;
1942
1943         ret = wpa_supplicant_stop_sched_scan(wpa_s);
1944
1945         wpa_s->pno = 0;
1946         wpa_s->pno_sched_pending = 0;
1947
1948         if (wpa_s->wpa_state == WPA_SCANNING)
1949                 wpa_supplicant_req_scan(wpa_s, 0, 0);
1950
1951         return ret;
1952 }