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