wpa_supplicant/scan.c

   1 /*
   2  * WPA Supplicant - Scanning
   3  * Copyright (c) 2003-2014, Jouni Malinen <j@w1.fi>
   4  *
   5  * This software may be distributed under the terms of the BSD license.
   6  * See README for more details.
   7  */
   8
   9 #include "utils/includes.h"
  10
  11 #include "utils/common.h"
  12 #include "utils/eloop.h"
  13 #include "common/ieee802_11_defs.h"
  14 #include "common/wpa_ctrl.h"
  15 #include "config.h"
  16 #include "wpa_supplicant_i.h"
  17 #include "driver_i.h"
  18 #include "wps_supplicant.h"
  19 #include "p2p_supplicant.h"
  20 #include "p2p/p2p.h"
  21 #include "hs20_supplicant.h"
  22 #include "notify.h"
  23 #include "bss.h"
  24 #include "scan.h"
  25 #include "mesh.h"
  26
  27
  28 static void wpa_supplicant_gen_assoc_event(struct wpa_supplicant *wpa_s)
  29 {
  30         struct wpa_ssid *ssid;
  31         union wpa_event_data data;
  32
  33         ssid = wpa_supplicant_get_ssid(wpa_s);
  34         if (ssid == NULL)
  35                 return;
  36
  37         if (wpa_s->current_ssid == NULL) {
  38                 wpa_s->current_ssid = ssid;
  39                 if (wpa_s->current_ssid != NULL)
  40                         wpas_notify_network_changed(wpa_s);
  41         }
  42         wpa_supplicant_initiate_eapol(wpa_s);
  43         wpa_dbg(wpa_s, MSG_DEBUG, "Already associated with a configured "
  44                 "network - generating associated event");
  45         os_memset(&data, 0, sizeof(data));
  46         wpa_supplicant_event(wpa_s, EVENT_ASSOC, &data);
  47 }
  48
  49
  50 #ifdef CONFIG_WPS
  51 static int wpas_wps_in_use(struct wpa_supplicant *wpa_s,
  52                            enum wps_request_type *req_type)
  53 {
  54         struct wpa_ssid *ssid;
  55         int wps = 0;
  56
  57         for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
  58                 if (!(ssid->key_mgmt & WPA_KEY_MGMT_WPS))
  59                         continue;
  60
  61                 wps = 1;
  62                 *req_type = wpas_wps_get_req_type(ssid);
  63                 if (!ssid->eap.phase1)
  64                         continue;
  65
  66                 if (os_strstr(ssid->eap.phase1, "pbc=1"))
  67                         return 2;
  68         }
  69
  70 #ifdef CONFIG_P2P
  71         if (!wpa_s->global->p2p_disabled && wpa_s->global->p2p &&
  72             !wpa_s->conf->p2p_disabled) {
  73                 wpa_s->wps->dev.p2p = 1;
  74                 if (!wps) {
  75                         wps = 1;
  76                         *req_type = WPS_REQ_ENROLLEE_INFO;
  77                 }
  78         }
  79 #endif /* CONFIG_P2P */
  80
  81         return wps;
  82 }
  83 #endif /* CONFIG_WPS */
  84
  85
  86 /**
  87  * wpa_supplicant_enabled_networks - Check whether there are enabled networks
  88  * @wpa_s: Pointer to wpa_supplicant data
  89  * Returns: 0 if no networks are enabled, >0 if networks are enabled
  90  *
  91  * This function is used to figure out whether any networks (or Interworking
  92  * with enabled credentials and auto_interworking) are present in the current
  93  * configuration.
  94  */
  95 int wpa_supplicant_enabled_networks(struct wpa_supplicant *wpa_s)
  96 {
  97         struct wpa_ssid *ssid = wpa_s->conf->ssid;
  98         int count = 0, disabled = 0;
  99         while (ssid) {
 100                 if (!wpas_network_disabled(wpa_s, ssid))
 101                         count++;
 102                 else
 103                         disabled++;
 104                 ssid = ssid->next;
 105         }
 106         if (wpa_s->conf->cred && wpa_s->conf->interworking &&
 107             wpa_s->conf->auto_interworking)
 108                 count++;
 109         if (count == 0 && disabled > 0) {
 110                 wpa_dbg(wpa_s, MSG_DEBUG, "No enabled networks (%d disabled "
 111                         "networks)", disabled);
 112         }
 113         return count;
 114 }
 115
 116
 117 static void wpa_supplicant_assoc_try(struct wpa_supplicant *wpa_s,
 118                                      struct wpa_ssid *ssid)
 119 {
 120         while (ssid) {
 121                 if (!wpas_network_disabled(wpa_s, ssid))
 122                         break;
 123                 ssid = ssid->next;
 124         }
 125
 126         /* ap_scan=2 mode - try to associate with each SSID. */
 127         if (ssid == NULL) {
 128                 wpa_dbg(wpa_s, MSG_DEBUG, "wpa_supplicant_assoc_try: Reached "
 129                         "end of scan list - go back to beginning");
 130                 wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
 131                 wpa_supplicant_req_scan(wpa_s, 0, 0);
 132                 return;
 133         }
 134         if (ssid->next) {
 135                 /* Continue from the next SSID on the next attempt. */
 136                 wpa_s->prev_scan_ssid = ssid;
 137         } else {
 138                 /* Start from the beginning of the SSID list. */
 139                 wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
 140         }
 141         wpa_supplicant_associate(wpa_s, NULL, ssid);
 142 }
 143
 144
 145 static void wpas_trigger_scan_cb(struct wpa_radio_work *work, int deinit)
 146 {
 147         struct wpa_supplicant *wpa_s = work->wpa_s;
 148         struct wpa_driver_scan_params *params = work->ctx;
 149         int ret;
 150
 151         if (deinit) {
 152                 if (!work->started) {
 153                         wpa_scan_free_params(params);
 154                         return;
 155                 }
 156                 wpa_supplicant_notify_scanning(wpa_s, 0);
 157                 wpas_notify_scan_done(wpa_s, 0);
 158                 wpa_s->scan_work = NULL;
 159                 return;
 160         }
 161
 162         if (wpas_update_random_addr_disassoc(wpa_s) < 0) {
 163                 wpa_msg(wpa_s, MSG_INFO,
 164                         "Failed to assign random MAC address for a scan");
 165                 radio_work_done(work);
 166                 return;
 167         }
 168
 169         wpa_supplicant_notify_scanning(wpa_s, 1);
 170
 171         if (wpa_s->clear_driver_scan_cache)
 172                 params->only_new_results = 1;
 173         ret = wpa_drv_scan(wpa_s, params);
 174         wpa_scan_free_params(params);
 175         work->ctx = NULL;
 176         if (ret) {
 177                 wpa_supplicant_notify_scanning(wpa_s, 0);
 178                 wpas_notify_scan_done(wpa_s, 0);
 179                 wpa_msg_ctrl(wpa_s, MSG_INFO, WPA_EVENT_SCAN_FAILED "ret=%d",
 180                              ret);
 181                 radio_work_done(work);
 182                 return;
 183         }
 184
 185         os_get_reltime(&wpa_s->scan_trigger_time);
 186         wpa_s->scan_runs++;
 187         wpa_s->normal_scans++;
 188         wpa_s->own_scan_requested = 1;
 189         wpa_s->clear_driver_scan_cache = 0;
 190         wpa_s->scan_work = work;
 191 }
 192
 193
 194 /**
 195  * wpa_supplicant_trigger_scan - Request driver to start a scan
 196  * @wpa_s: Pointer to wpa_supplicant data
 197  * @params: Scan parameters
 198  * Returns: 0 on success, -1 on failure
 199  */
 200 int wpa_supplicant_trigger_scan(struct wpa_supplicant *wpa_s,
 201                                 struct wpa_driver_scan_params *params)
 202 {
 203         struct wpa_driver_scan_params *ctx;
 204
 205         if (wpa_s->scan_work) {
 206                 wpa_dbg(wpa_s, MSG_INFO, "Reject scan trigger since one is already pending");
 207                 return -1;
 208         }
 209
 210         ctx = wpa_scan_clone_params(params);
 211         if (ctx == NULL)
 212                 return -1;
 213
 214         if (radio_add_work(wpa_s, 0, "scan", 0, wpas_trigger_scan_cb, ctx) < 0)
 215         {
 216                 wpa_scan_free_params(ctx);
 217                 return -1;
 218         }
 219
 220         return 0;
 221 }
 222
 223
 224 static void
 225 wpa_supplicant_delayed_sched_scan_timeout(void *eloop_ctx, void *timeout_ctx)
 226 {
 227         struct wpa_supplicant *wpa_s = eloop_ctx;
 228
 229         wpa_dbg(wpa_s, MSG_DEBUG, "Starting delayed sched scan");
 230
 231         if (wpa_supplicant_req_sched_scan(wpa_s))
 232                 wpa_supplicant_req_scan(wpa_s, 0, 0);
 233 }
 234
 235
 236 static void
 237 wpa_supplicant_sched_scan_timeout(void *eloop_ctx, void *timeout_ctx)
 238 {
 239         struct wpa_supplicant *wpa_s = eloop_ctx;
 240
 241         wpa_dbg(wpa_s, MSG_DEBUG, "Sched scan timeout - stopping it");
 242
 243         wpa_s->sched_scan_timed_out = 1;
 244         wpa_supplicant_cancel_sched_scan(wpa_s);
 245 }
 246
 247
 248 int wpa_supplicant_start_sched_scan(struct wpa_supplicant *wpa_s,
 249                                     struct wpa_driver_scan_params *params,
 250                                     int interval)
 251 {
 252         int ret;
 253
 254         wpa_supplicant_notify_scanning(wpa_s, 1);
 255         ret = wpa_drv_sched_scan(wpa_s, params, interval * 1000);
 256         if (ret)
 257                 wpa_supplicant_notify_scanning(wpa_s, 0);
 258         else
 259                 wpa_s->sched_scanning = 1;
 260
 261         return ret;
 262 }
 263
 264
 265 int wpa_supplicant_stop_sched_scan(struct wpa_supplicant *wpa_s)
 266 {
 267         int ret;
 268
 269         ret = wpa_drv_stop_sched_scan(wpa_s);
 270         if (ret) {
 271                 wpa_dbg(wpa_s, MSG_DEBUG, "stopping sched_scan failed!");
 272                 /* TODO: what to do if stopping fails? */
 273                 return -1;
 274         }
 275
 276         return ret;
 277 }
 278
 279
 280 static struct wpa_driver_scan_filter *
 281 wpa_supplicant_build_filter_ssids(struct wpa_config *conf, size_t *num_ssids)
 282 {
 283         struct wpa_driver_scan_filter *ssids;
 284         struct wpa_ssid *ssid;
 285         size_t count;
 286
 287         *num_ssids = 0;
 288         if (!conf->filter_ssids)
 289                 return NULL;
 290
 291         for (count = 0, ssid = conf->ssid; ssid; ssid = ssid->next) {
 292                 if (ssid->ssid && ssid->ssid_len)
 293                         count++;
 294         }
 295         if (count == 0)
 296                 return NULL;
 297         ssids = os_calloc(count, sizeof(struct wpa_driver_scan_filter));
 298         if (ssids == NULL)
 299                 return NULL;
 300
 301         for (ssid = conf->ssid; ssid; ssid = ssid->next) {
 302                 if (!ssid->ssid || !ssid->ssid_len)
 303                         continue;
 304                 os_memcpy(ssids[*num_ssids].ssid, ssid->ssid, ssid->ssid_len);
 305                 ssids[*num_ssids].ssid_len = ssid->ssid_len;
 306                 (*num_ssids)++;
 307         }
 308
 309         return ssids;
 310 }
 311
 312
 313 static void wpa_supplicant_optimize_freqs(
 314         struct wpa_supplicant *wpa_s, struct wpa_driver_scan_params *params)
 315 {
 316 #ifdef CONFIG_P2P
 317         if (params->freqs == NULL && wpa_s->p2p_in_provisioning &&
 318             wpa_s->go_params) {
 319                 /* Optimize provisioning state scan based on GO information */
 320                 if (wpa_s->p2p_in_provisioning < 5 &&
 321                     wpa_s->go_params->freq > 0) {
 322                         wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only GO "
 323                                 "preferred frequency %d MHz",
 324                                 wpa_s->go_params->freq);
 325                         params->freqs = os_calloc(2, sizeof(int));
 326                         if (params->freqs)
 327                                 params->freqs[0] = wpa_s->go_params->freq;
 328                 } else if (wpa_s->p2p_in_provisioning < 8 &&
 329                            wpa_s->go_params->freq_list[0]) {
 330                         wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only common "
 331                                 "channels");
 332                         int_array_concat(&params->freqs,
 333                                          wpa_s->go_params->freq_list);
 334                         if (params->freqs)
 335                                 int_array_sort_unique(params->freqs);
 336                 }
 337                 wpa_s->p2p_in_provisioning++;
 338         }
 339
 340         if (params->freqs == NULL && wpa_s->p2p_in_invitation) {
 341                 /*
 342                  * Optimize scan based on GO information during persistent
 343                  * group reinvocation
 344                  */
 345                 if (wpa_s->p2p_in_invitation < 5 &&
 346                     wpa_s->p2p_invite_go_freq > 0) {
 347                         wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only GO preferred frequency %d MHz during invitation",
 348                                 wpa_s->p2p_invite_go_freq);
 349                         params->freqs = os_calloc(2, sizeof(int));
 350                         if (params->freqs)
 351                                 params->freqs[0] = wpa_s->p2p_invite_go_freq;
 352                 }
 353                 wpa_s->p2p_in_invitation++;
 354                 if (wpa_s->p2p_in_invitation > 20) {
 355                         /*
 356                          * This should not really happen since the variable is
 357                          * cleared on group removal, but if it does happen, make
 358                          * sure we do not get stuck in special invitation scan
 359                          * mode.
 360                          */
 361                         wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Clear p2p_in_invitation");
 362                         wpa_s->p2p_in_invitation = 0;
 363                 }
 364         }
 365 #endif /* CONFIG_P2P */
 366
 367 #ifdef CONFIG_WPS
 368         if (params->freqs == NULL && wpa_s->after_wps && wpa_s->wps_freq) {
 369                 /*
 370                  * Optimize post-provisioning scan based on channel used
 371                  * during provisioning.
 372                  */
 373                 wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Scan only frequency %u MHz "
 374                         "that was used during provisioning", wpa_s->wps_freq);
 375                 params->freqs = os_calloc(2, sizeof(int));
 376                 if (params->freqs)
 377                         params->freqs[0] = wpa_s->wps_freq;
 378                 wpa_s->after_wps--;
 379         } else if (wpa_s->after_wps)
 380                 wpa_s->after_wps--;
 381
 382         if (params->freqs == NULL && wpa_s->known_wps_freq && wpa_s->wps_freq)
 383         {
 384                 /* Optimize provisioning scan based on already known channel */
 385                 wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Scan only frequency %u MHz",
 386                         wpa_s->wps_freq);
 387                 params->freqs = os_calloc(2, sizeof(int));
 388                 if (params->freqs)
 389                         params->freqs[0] = wpa_s->wps_freq;
 390                 wpa_s->known_wps_freq = 0; /* only do this once */
 391         }
 392 #endif /* CONFIG_WPS */
 393 }
 394
 395
 396 #ifdef CONFIG_INTERWORKING
 397 static void wpas_add_interworking_elements(struct wpa_supplicant *wpa_s,
 398                                            struct wpabuf *buf)
 399 {
 400         if (wpa_s->conf->interworking == 0)
 401                 return;
 402
 403         wpabuf_put_u8(buf, WLAN_EID_EXT_CAPAB);
 404         wpabuf_put_u8(buf, 6);
 405         wpabuf_put_u8(buf, 0x00);
 406         wpabuf_put_u8(buf, 0x00);
 407         wpabuf_put_u8(buf, 0x00);
 408         wpabuf_put_u8(buf, 0x80); /* Bit 31 - Interworking */
 409         wpabuf_put_u8(buf, 0x00);
 410 #ifdef CONFIG_HS20
 411         wpabuf_put_u8(buf, 0x40); /* Bit 46 - WNM-Notification */
 412 #else /* CONFIG_HS20 */
 413         wpabuf_put_u8(buf, 0x00);
 414 #endif /* CONFIG_HS20 */
 415
 416         wpabuf_put_u8(buf, WLAN_EID_INTERWORKING);
 417         wpabuf_put_u8(buf, is_zero_ether_addr(wpa_s->conf->hessid) ? 1 :
 418                       1 + ETH_ALEN);
 419         wpabuf_put_u8(buf, wpa_s->conf->access_network_type);
 420         /* No Venue Info */
 421         if (!is_zero_ether_addr(wpa_s->conf->hessid))
 422                 wpabuf_put_data(buf, wpa_s->conf->hessid, ETH_ALEN);
 423 }
 424 #endif /* CONFIG_INTERWORKING */
 425
 426
 427 static struct wpabuf * wpa_supplicant_extra_ies(struct wpa_supplicant *wpa_s)
 428 {
 429         struct wpabuf *extra_ie = NULL;
 430 #ifdef CONFIG_WPS
 431         int wps = 0;
 432         enum wps_request_type req_type = WPS_REQ_ENROLLEE_INFO;
 433 #endif /* CONFIG_WPS */
 434
 435 #ifdef CONFIG_INTERWORKING
 436         if (wpa_s->conf->interworking &&
 437             wpabuf_resize(&extra_ie, 100) == 0)
 438                 wpas_add_interworking_elements(wpa_s, extra_ie);
 439 #endif /* CONFIG_INTERWORKING */
 440
 441 #ifdef CONFIG_WPS
 442         wps = wpas_wps_in_use(wpa_s, &req_type);
 443
 444         if (wps) {
 445                 struct wpabuf *wps_ie;
 446                 wps_ie = wps_build_probe_req_ie(wps == 2 ? DEV_PW_PUSHBUTTON :
 447                                                 DEV_PW_DEFAULT,
 448                                                 &wpa_s->wps->dev,
 449                                                 wpa_s->wps->uuid, req_type,
 450                                                 0, NULL);
 451                 if (wps_ie) {
 452                         if (wpabuf_resize(&extra_ie, wpabuf_len(wps_ie)) == 0)
 453                                 wpabuf_put_buf(extra_ie, wps_ie);
 454                         wpabuf_free(wps_ie);
 455                 }
 456         }
 457
 458 #ifdef CONFIG_P2P
 459         if (wps) {
 460                 size_t ielen = p2p_scan_ie_buf_len(wpa_s->global->p2p);
 461                 if (wpabuf_resize(&extra_ie, ielen) == 0)
 462                         wpas_p2p_scan_ie(wpa_s, extra_ie);
 463         }
 464 #endif /* CONFIG_P2P */
 465
 466         wpa_supplicant_mesh_add_scan_ie(wpa_s, &extra_ie);
 467
 468 #endif /* CONFIG_WPS */
 469
 470 #ifdef CONFIG_HS20
 471         if (wpa_s->conf->hs20 && wpabuf_resize(&extra_ie, 7) == 0)
 472                 wpas_hs20_add_indication(extra_ie, -1);
 473 #endif /* CONFIG_HS20 */
 474
 475         return extra_ie;
 476 }
 477
 478
 479 #ifdef CONFIG_P2P
 480
 481 /*
 482  * Check whether there are any enabled networks or credentials that could be
 483  * used for a non-P2P connection.
 484  */
 485 static int non_p2p_network_enabled(struct wpa_supplicant *wpa_s)
 486 {
 487         struct wpa_ssid *ssid;
 488
 489         for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
 490                 if (wpas_network_disabled(wpa_s, ssid))
 491                         continue;
 492                 if (!ssid->p2p_group)
 493                         return 1;
 494         }
 495
 496         if (wpa_s->conf->cred && wpa_s->conf->interworking &&
 497             wpa_s->conf->auto_interworking)
 498                 return 1;
 499
 500         return 0;
 501 }
 502
 503 #endif /* CONFIG_P2P */
 504
 505
 506 static struct hostapd_hw_modes * get_mode(struct hostapd_hw_modes *modes,
 507                                           u16 num_modes,
 508                                           enum hostapd_hw_mode mode)
 509 {
 510         u16 i;
 511
 512         for (i = 0; i < num_modes; i++) {
 513                 if (modes[i].mode == mode)
 514                         return &modes[i];
 515         }
 516
 517         return NULL;
 518 }
 519
 520
 521 static void wpa_setband_scan_freqs_list(struct wpa_supplicant *wpa_s,
 522                                         enum hostapd_hw_mode band,
 523                                         struct wpa_driver_scan_params *params)
 524 {
 525         /* Include only supported channels for the specified band */
 526         struct hostapd_hw_modes *mode;
 527         int count, i;
 528
 529         mode = get_mode(wpa_s->hw.modes, wpa_s->hw.num_modes, band);
 530         if (mode == NULL) {
 531                 /* No channels supported in this band - use empty list */
 532                 params->freqs = os_zalloc(sizeof(int));
 533                 return;
 534         }
 535
 536         params->freqs = os_calloc(mode->num_channels + 1, sizeof(int));
 537         if (params->freqs == NULL)
 538                 return;
 539         for (count = 0, i = 0; i < mode->num_channels; i++) {
 540                 if (mode->channels[i].flag & HOSTAPD_CHAN_DISABLED)
 541                         continue;
 542                 params->freqs[count++] = mode->channels[i].freq;
 543         }
 544 }
 545
 546
 547 static void wpa_setband_scan_freqs(struct wpa_supplicant *wpa_s,
 548                                    struct wpa_driver_scan_params *params)
 549 {
 550         if (wpa_s->hw.modes == NULL)
 551                 return; /* unknown what channels the driver supports */
 552         if (params->freqs)
 553                 return; /* already using a limited channel set */
 554         if (wpa_s->setband == WPA_SETBAND_5G)
 555                 wpa_setband_scan_freqs_list(wpa_s, HOSTAPD_MODE_IEEE80211A,
 556                                             params);
 557         else if (wpa_s->setband == WPA_SETBAND_2G)
 558                 wpa_setband_scan_freqs_list(wpa_s, HOSTAPD_MODE_IEEE80211G,
 559                                             params);
 560 }
 561
 562
 563 static void wpa_set_scan_ssids(struct wpa_supplicant *wpa_s,
 564                                struct wpa_driver_scan_params *params,
 565                                size_t max_ssids)
 566 {
 567         unsigned int i;
 568         struct wpa_ssid *ssid;
 569
 570         for (i = 0; i < wpa_s->scan_id_count; i++) {
 571                 unsigned int j;
 572
 573                 ssid = wpa_config_get_network(wpa_s->conf, wpa_s->scan_id[i]);
 574                 if (!ssid || !ssid->scan_ssid)
 575                         continue;
 576
 577                 for (j = 0; j < params->num_ssids; j++) {
 578                         if (params->ssids[j].ssid_len == ssid->ssid_len &&
 579                             params->ssids[j].ssid &&
 580                             os_memcmp(params->ssids[j].ssid, ssid->ssid,
 581                                       ssid->ssid_len) == 0)
 582                                 break;
 583                 }
 584                 if (j < params->num_ssids)
 585                         continue; /* already in the list */
 586
 587                 if (params->num_ssids + 1 > max_ssids) {
 588                         wpa_printf(MSG_DEBUG,
 589                                    "Over max scan SSIDs for manual request");
 590                         break;
 591                 }
 592
 593                 wpa_printf(MSG_DEBUG, "Scan SSID (manual request): %s",
 594                            wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
 595                 params->ssids[params->num_ssids].ssid = ssid->ssid;
 596                 params->ssids[params->num_ssids].ssid_len = ssid->ssid_len;
 597                 params->num_ssids++;
 598         }
 599
 600         wpa_s->scan_id_count = 0;
 601 }
 602
 603
 604 static void wpa_supplicant_scan(void *eloop_ctx, void *timeout_ctx)
 605 {
 606         struct wpa_supplicant *wpa_s = eloop_ctx;
 607         struct wpa_ssid *ssid;
 608         int ret, p2p_in_progress;
 609         struct wpabuf *extra_ie = NULL;
 610         struct wpa_driver_scan_params params;
 611         struct wpa_driver_scan_params *scan_params;
 612         size_t max_ssids;
 613         enum wpa_states prev_state;
 614
 615         if (wpa_s->pno || wpa_s->pno_sched_pending) {
 616                 wpa_dbg(wpa_s, MSG_DEBUG, "Skip scan - PNO is in progress");
 617                 return;
 618         }
 619
 620         if (wpa_s->wpa_state == WPA_INTERFACE_DISABLED) {
 621                 wpa_dbg(wpa_s, MSG_DEBUG, "Skip scan - interface disabled");
 622                 return;
 623         }
 624
 625         if (wpa_s->disconnected && wpa_s->scan_req == NORMAL_SCAN_REQ) {
 626                 wpa_dbg(wpa_s, MSG_DEBUG, "Disconnected - do not scan");
 627                 wpa_supplicant_set_state(wpa_s, WPA_DISCONNECTED);
 628                 return;
 629         }
 630
 631         if (wpa_s->scanning) {
 632                 /*
 633                  * If we are already in scanning state, we shall reschedule the
 634                  * the incoming scan request.
 635                  */
 636                 wpa_dbg(wpa_s, MSG_DEBUG, "Already scanning - Reschedule the incoming scan req");
 637                 wpa_supplicant_req_scan(wpa_s, 1, 0);
 638                 return;
 639         }
 640
 641         if (!wpa_supplicant_enabled_networks(wpa_s) &&
 642             wpa_s->scan_req == NORMAL_SCAN_REQ) {
 643                 wpa_dbg(wpa_s, MSG_DEBUG, "No enabled networks - do not scan");
 644                 wpa_supplicant_set_state(wpa_s, WPA_INACTIVE);
 645                 return;
 646         }
 647
 648         if (wpa_s->conf->ap_scan != 0 &&
 649             (wpa_s->drv_flags & WPA_DRIVER_FLAGS_WIRED)) {
 650                 wpa_dbg(wpa_s, MSG_DEBUG, "Using wired authentication - "
 651                         "overriding ap_scan configuration");
 652                 wpa_s->conf->ap_scan = 0;
 653                 wpas_notify_ap_scan_changed(wpa_s);
 654         }
 655
 656         if (wpa_s->conf->ap_scan == 0) {
 657                 wpa_supplicant_gen_assoc_event(wpa_s);
 658                 return;
 659         }
 660
 661         p2p_in_progress = wpas_p2p_in_progress(wpa_s);
 662         if (p2p_in_progress && p2p_in_progress != 2) {
 663                 wpa_dbg(wpa_s, MSG_DEBUG, "Delay station mode scan while P2P operation is in progress");
 664                 wpa_supplicant_req_scan(wpa_s, 5, 0);
 665                 return;
 666         }
 667
 668         if (wpa_s->conf->ap_scan == 2)
 669                 max_ssids = 1;
 670         else {
 671                 max_ssids = wpa_s->max_scan_ssids;
 672                 if (max_ssids > WPAS_MAX_SCAN_SSIDS)
 673                         max_ssids = WPAS_MAX_SCAN_SSIDS;
 674         }
 675
 676         wpa_s->last_scan_req = wpa_s->scan_req;
 677         wpa_s->scan_req = NORMAL_SCAN_REQ;
 678
 679         os_memset(&params, 0, sizeof(params));
 680
 681         prev_state = wpa_s->wpa_state;
 682         if (wpa_s->wpa_state == WPA_DISCONNECTED ||
 683             wpa_s->wpa_state == WPA_INACTIVE)
 684                 wpa_supplicant_set_state(wpa_s, WPA_SCANNING);
 685
 686         /*
 687          * If autoscan has set its own scanning parameters
 688          */
 689         if (wpa_s->autoscan_params != NULL) {
 690                 scan_params = wpa_s->autoscan_params;
 691                 goto scan;
 692         }
 693
 694         if (wpa_s->last_scan_req != MANUAL_SCAN_REQ &&
 695             wpa_s->connect_without_scan) {
 696                 for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
 697                         if (ssid == wpa_s->connect_without_scan)
 698                                 break;
 699                 }
 700                 wpa_s->connect_without_scan = NULL;
 701                 if (ssid) {
 702                         wpa_printf(MSG_DEBUG, "Start a pre-selected network "
 703                                    "without scan step");
 704                         wpa_supplicant_associate(wpa_s, NULL, ssid);
 705                         return;
 706                 }
 707         }
 708
 709 #ifdef CONFIG_P2P
 710         if ((wpa_s->p2p_in_provisioning || wpa_s->show_group_started) &&
 711             wpa_s->go_params) {
 712                 wpa_printf(MSG_DEBUG, "P2P: Use specific SSID for scan during P2P group formation (p2p_in_provisioning=%d show_group_started=%d)",
 713                            wpa_s->p2p_in_provisioning,
 714                            wpa_s->show_group_started);
 715                 params.ssids[0].ssid = wpa_s->go_params->ssid;
 716                 params.ssids[0].ssid_len = wpa_s->go_params->ssid_len;
 717                 params.num_ssids = 1;
 718                 goto ssid_list_set;
 719         }
 720
 721         if (wpa_s->p2p_in_invitation) {
 722                 if (wpa_s->current_ssid) {
 723                         wpa_printf(MSG_DEBUG, "P2P: Use specific SSID for scan during invitation");
 724                         params.ssids[0].ssid = wpa_s->current_ssid->ssid;
 725                         params.ssids[0].ssid_len =
 726                                 wpa_s->current_ssid->ssid_len;
 727                         params.num_ssids = 1;
 728                 } else {
 729                         wpa_printf(MSG_DEBUG, "P2P: No specific SSID known for scan during invitation");
 730                 }
 731                 goto ssid_list_set;
 732         }
 733 #endif /* CONFIG_P2P */
 734
 735         /* Find the starting point from which to continue scanning */
 736         ssid = wpa_s->conf->ssid;
 737         if (wpa_s->prev_scan_ssid != WILDCARD_SSID_SCAN) {
 738                 while (ssid) {
 739                         if (ssid == wpa_s->prev_scan_ssid) {
 740                                 ssid = ssid->next;
 741                                 break;
 742                         }
 743                         ssid = ssid->next;
 744                 }
 745         }
 746
 747         if (wpa_s->last_scan_req != MANUAL_SCAN_REQ &&
 748             wpa_s->conf->ap_scan == 2) {
 749                 wpa_s->connect_without_scan = NULL;
 750                 wpa_s->prev_scan_wildcard = 0;
 751                 wpa_supplicant_assoc_try(wpa_s, ssid);
 752                 return;
 753         } else if (wpa_s->conf->ap_scan == 2) {
 754                 /*
 755                  * User-initiated scan request in ap_scan == 2; scan with
 756                  * wildcard SSID.
 757                  */
 758                 ssid = NULL;
 759         } else if (wpa_s->reattach && wpa_s->current_ssid != NULL) {
 760                 /*
 761                  * Perform single-channel single-SSID scan for
 762                  * reassociate-to-same-BSS operation.
 763                  */
 764                 /* Setup SSID */
 765                 ssid = wpa_s->current_ssid;
 766                 wpa_hexdump_ascii(MSG_DEBUG, "Scan SSID",
 767                                   ssid->ssid, ssid->ssid_len);
 768                 params.ssids[0].ssid = ssid->ssid;
 769                 params.ssids[0].ssid_len = ssid->ssid_len;
 770                 params.num_ssids = 1;
 771
 772                 /*
 773                  * Allocate memory for frequency array, allocate one extra
 774                  * slot for the zero-terminator.
 775                  */
 776                 params.freqs = os_malloc(sizeof(int) * 2);
 777                 if (params.freqs == NULL) {
 778                         wpa_dbg(wpa_s, MSG_ERROR, "Memory allocation failed");
 779                         return;
 780                 }
 781                 params.freqs[0] = wpa_s->assoc_freq;
 782                 params.freqs[1] = 0;
 783
 784                 /*
 785                  * Reset the reattach flag so that we fall back to full scan if
 786                  * this scan fails.
 787                  */
 788                 wpa_s->reattach = 0;
 789         } else {
 790                 struct wpa_ssid *start = ssid, *tssid;
 791                 int freqs_set = 0;
 792                 if (ssid == NULL && max_ssids > 1)
 793                         ssid = wpa_s->conf->ssid;
 794                 while (ssid) {
 795                         if (!wpas_network_disabled(wpa_s, ssid) &&
 796                             ssid->scan_ssid) {
 797                                 wpa_hexdump_ascii(MSG_DEBUG, "Scan SSID",
 798                                                   ssid->ssid, ssid->ssid_len);
 799                                 params.ssids[params.num_ssids].ssid =
 800                                         ssid->ssid;
 801                                 params.ssids[params.num_ssids].ssid_len =
 802                                         ssid->ssid_len;
 803                                 params.num_ssids++;
 804                                 if (params.num_ssids + 1 >= max_ssids)
 805                                         break;
 806                         }
 807                         ssid = ssid->next;
 808                         if (ssid == start)
 809                                 break;
 810                         if (ssid == NULL && max_ssids > 1 &&
 811                             start != wpa_s->conf->ssid)
 812                                 ssid = wpa_s->conf->ssid;
 813                 }
 814
 815                 if (wpa_s->scan_id_count &&
 816                     wpa_s->last_scan_req == MANUAL_SCAN_REQ)
 817                         wpa_set_scan_ssids(wpa_s, &params, max_ssids);
 818
 819                 for (tssid = wpa_s->conf->ssid; tssid; tssid = tssid->next) {
 820                         if (wpas_network_disabled(wpa_s, tssid))
 821                                 continue;
 822                         if ((params.freqs || !freqs_set) && tssid->scan_freq) {
 823                                 int_array_concat(&params.freqs,
 824                                                  tssid->scan_freq);
 825                         } else {
 826                                 os_free(params.freqs);
 827                                 params.freqs = NULL;
 828                         }
 829                         freqs_set = 1;
 830                 }
 831                 int_array_sort_unique(params.freqs);
 832         }
 833
 834         if (ssid && max_ssids == 1) {
 835                 /*
 836                  * If the driver is limited to 1 SSID at a time interleave
 837                  * wildcard SSID scans with specific SSID scans to avoid
 838                  * waiting a long time for a wildcard scan.
 839                  */
 840                 if (!wpa_s->prev_scan_wildcard) {
 841                         params.ssids[0].ssid = NULL;
 842                         params.ssids[0].ssid_len = 0;
 843                         wpa_s->prev_scan_wildcard = 1;
 844                         wpa_dbg(wpa_s, MSG_DEBUG, "Starting AP scan for "
 845                                 "wildcard SSID (Interleave with specific)");
 846                 } else {
 847                         wpa_s->prev_scan_ssid = ssid;
 848                         wpa_s->prev_scan_wildcard = 0;
 849                         wpa_dbg(wpa_s, MSG_DEBUG,
 850                                 "Starting AP scan for specific SSID: %s",
 851                                 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
 852                 }
 853         } else if (ssid) {
 854                 /* max_ssids > 1 */
 855
 856                 wpa_s->prev_scan_ssid = ssid;
 857                 wpa_dbg(wpa_s, MSG_DEBUG, "Include wildcard SSID in "
 858                         "the scan request");
 859                 params.num_ssids++;
 860         } else if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
 861                    wpa_s->manual_scan_passive && params.num_ssids == 0) {
 862                 wpa_dbg(wpa_s, MSG_DEBUG, "Use passive scan based on manual request");
 863         } else {
 864                 wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
 865                 params.num_ssids++;
 866                 wpa_dbg(wpa_s, MSG_DEBUG, "Starting AP scan for wildcard "
 867                         "SSID");
 868         }
 869 #ifdef CONFIG_P2P
 870 ssid_list_set:
 871 #endif /* CONFIG_P2P */
 872
 873         wpa_supplicant_optimize_freqs(wpa_s, &params);
 874         extra_ie = wpa_supplicant_extra_ies(wpa_s);
 875
 876         if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
 877             wpa_s->manual_scan_only_new)
 878                 params.only_new_results = 1;
 879
 880         if (wpa_s->last_scan_req == MANUAL_SCAN_REQ && params.freqs == NULL &&
 881             wpa_s->manual_scan_freqs) {
 882                 wpa_dbg(wpa_s, MSG_DEBUG, "Limit manual scan to specified channels");
 883                 params.freqs = wpa_s->manual_scan_freqs;
 884                 wpa_s->manual_scan_freqs = NULL;
 885         }
 886
 887         if (params.freqs == NULL && wpa_s->next_scan_freqs) {
 888                 wpa_dbg(wpa_s, MSG_DEBUG, "Optimize scan based on previously "
 889                         "generated frequency list");
 890                 params.freqs = wpa_s->next_scan_freqs;
 891         } else
 892                 os_free(wpa_s->next_scan_freqs);
 893         wpa_s->next_scan_freqs = NULL;
 894         wpa_setband_scan_freqs(wpa_s, &params);
 895
 896         /* See if user specified frequencies. If so, scan only those. */
 897         if (wpa_s->conf->freq_list && !params.freqs) {
 898                 wpa_dbg(wpa_s, MSG_DEBUG,
 899                         "Optimize scan based on conf->freq_list");
 900                 int_array_concat(&params.freqs, wpa_s->conf->freq_list);
 901         }
 902
 903         /* Use current associated channel? */
 904         if (wpa_s->conf->scan_cur_freq && !params.freqs) {
 905                 unsigned int num = wpa_s->num_multichan_concurrent;
 906
 907                 params.freqs = os_calloc(num + 1, sizeof(int));
 908                 if (params.freqs) {
 909                         num = get_shared_radio_freqs(wpa_s, params.freqs, num);
 910                         if (num > 0) {
 911                                 wpa_dbg(wpa_s, MSG_DEBUG, "Scan only the "
 912                                         "current operating channels since "
 913                                         "scan_cur_freq is enabled");
 914                         } else {
 915                                 os_free(params.freqs);
 916                                 params.freqs = NULL;
 917                         }
 918                 }
 919         }
 920
 921         params.filter_ssids = wpa_supplicant_build_filter_ssids(
 922                 wpa_s->conf, &params.num_filter_ssids);
 923         if (extra_ie) {
 924                 params.extra_ies = wpabuf_head(extra_ie);
 925                 params.extra_ies_len = wpabuf_len(extra_ie);
 926         }
 927
 928 #ifdef CONFIG_P2P
 929         if (wpa_s->p2p_in_provisioning || wpa_s->p2p_in_invitation ||
 930             (wpa_s->show_group_started && wpa_s->go_params)) {
 931                 /*
 932                  * The interface may not yet be in P2P mode, so we have to
 933                  * explicitly request P2P probe to disable CCK rates.
 934                  */
 935                 params.p2p_probe = 1;
 936         }
 937 #endif /* CONFIG_P2P */
 938
 939         scan_params = &params;
 940
 941 scan:
 942 #ifdef CONFIG_P2P
 943         /*
 944          * If the driver does not support multi-channel concurrency and a
 945          * virtual interface that shares the same radio with the wpa_s interface
 946          * is operating there may not be need to scan other channels apart from
 947          * the current operating channel on the other virtual interface. Filter
 948          * out other channels in case we are trying to find a connection for a
 949          * station interface when we are not configured to prefer station
 950          * connection and a concurrent operation is already in process.
 951          */
 952         if (wpa_s->scan_for_connection &&
 953             wpa_s->last_scan_req == NORMAL_SCAN_REQ &&
 954             !scan_params->freqs && !params.freqs &&
 955             wpas_is_p2p_prioritized(wpa_s) &&
 956             wpa_s->p2p_group_interface == NOT_P2P_GROUP_INTERFACE &&
 957             non_p2p_network_enabled(wpa_s)) {
 958                 unsigned int num = wpa_s->num_multichan_concurrent;
 959
 960                 params.freqs = os_calloc(num + 1, sizeof(int));
 961                 if (params.freqs) {
 962                         num = get_shared_radio_freqs(wpa_s, params.freqs, num);
 963                         if (num > 0 && num == wpa_s->num_multichan_concurrent) {
 964                                 wpa_dbg(wpa_s, MSG_DEBUG, "Scan only the current operating channels since all channels are already used");
 965                         } else {
 966                                 os_free(params.freqs);
 967                                 params.freqs = NULL;
 968                         }
 969                 }
 970         }
 971 #endif /* CONFIG_P2P */
 972
 973         ret = wpa_supplicant_trigger_scan(wpa_s, scan_params);
 974
 975         if (ret && wpa_s->last_scan_req == MANUAL_SCAN_REQ && params.freqs &&
 976             !wpa_s->manual_scan_freqs) {
 977                 /* Restore manual_scan_freqs for the next attempt */
 978                 wpa_s->manual_scan_freqs = params.freqs;
 979                 params.freqs = NULL;
 980         }
 981
 982         wpabuf_free(extra_ie);
 983         os_free(params.freqs);
 984         os_free(params.filter_ssids);
 985
 986         if (ret) {
 987                 wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate AP scan");
 988                 if (prev_state != wpa_s->wpa_state)
 989                         wpa_supplicant_set_state(wpa_s, prev_state);
 990                 /* Restore scan_req since we will try to scan again */
 991                 wpa_s->scan_req = wpa_s->last_scan_req;
 992                 wpa_supplicant_req_scan(wpa_s, 1, 0);
 993         } else {
 994                 wpa_s->scan_for_connection = 0;
 995         }
 996 }
 997
 998
 999 void wpa_supplicant_update_scan_int(struct wpa_supplicant *wpa_s, int sec)
1000 {
1001         struct os_reltime remaining, new_int;
1002         int cancelled;
1003
1004         cancelled = eloop_cancel_timeout_one(wpa_supplicant_scan, wpa_s, NULL,
1005                                              &remaining);
1006
1007         new_int.sec = sec;
1008         new_int.usec = 0;
1009         if (cancelled && os_reltime_before(&remaining, &new_int)) {
1010                 new_int.sec = remaining.sec;
1011                 new_int.usec = remaining.usec;
1012         }
1013
1014         if (cancelled) {
1015                 eloop_register_timeout(new_int.sec, new_int.usec,
1016                                        wpa_supplicant_scan, wpa_s, NULL);
1017         }
1018         wpa_s->scan_interval = sec;
1019 }
1020
1021
1022 /**
1023  * wpa_supplicant_req_scan - Schedule a scan for neighboring access points
1024  * @wpa_s: Pointer to wpa_supplicant data
1025  * @sec: Number of seconds after which to scan
1026  * @usec: Number of microseconds after which to scan
1027  *
1028  * This function is used to schedule a scan for neighboring access points after
1029  * the specified time.
1030  */
1031 void wpa_supplicant_req_scan(struct wpa_supplicant *wpa_s, int sec, int usec)
1032 {
1033         int res = eloop_deplete_timeout(sec, usec, wpa_supplicant_scan, wpa_s,
1034                                         NULL);
1035         if (res == 1) {
1036                 wpa_dbg(wpa_s, MSG_DEBUG, "Rescheduling scan request: %d.%06d sec",
1037                         sec, usec);
1038         } else if (res == 0) {
1039                 wpa_dbg(wpa_s, MSG_DEBUG, "Ignore new scan request for %d.%06d sec since an earlier request is scheduled to trigger sooner",
1040                         sec, usec);
1041         } else {
1042                 wpa_dbg(wpa_s, MSG_DEBUG, "Setting scan request: %d.%06d sec",
1043                         sec, usec);
1044                 eloop_register_timeout(sec, usec, wpa_supplicant_scan, wpa_s, NULL);
1045         }
1046 }
1047
1048
1049 /**
1050  * wpa_supplicant_delayed_sched_scan - Request a delayed scheduled scan
1051  * @wpa_s: Pointer to wpa_supplicant data
1052  * @sec: Number of seconds after which to scan
1053  * @usec: Number of microseconds after which to scan
1054  * Returns: 0 on success or -1 otherwise
1055  *
1056  * This function is used to schedule periodic scans for neighboring
1057  * access points after the specified time.
1058  */
1059 int wpa_supplicant_delayed_sched_scan(struct wpa_supplicant *wpa_s,
1060                                       int sec, int usec)
1061 {
1062         if (!wpa_s->sched_scan_supported)
1063                 return -1;
1064
1065         eloop_register_timeout(sec, usec,
1066                                wpa_supplicant_delayed_sched_scan_timeout,
1067                                wpa_s, NULL);
1068
1069         return 0;
1070 }
1071
1072
1073 /**
1074  * wpa_supplicant_req_sched_scan - Start a periodic scheduled scan
1075  * @wpa_s: Pointer to wpa_supplicant data
1076  * Returns: 0 is sched_scan was started or -1 otherwise
1077  *
1078  * This function is used to schedule periodic scans for neighboring
1079  * access points repeating the scan continuously.
1080  */
1081 int wpa_supplicant_req_sched_scan(struct wpa_supplicant *wpa_s)
1082 {
1083         struct wpa_driver_scan_params params;
1084         struct wpa_driver_scan_params *scan_params;
1085         enum wpa_states prev_state;
1086         struct wpa_ssid *ssid = NULL;
1087         struct wpabuf *extra_ie = NULL;
1088         int ret;
1089         unsigned int max_sched_scan_ssids;
1090         int wildcard = 0;
1091         int need_ssids;
1092
1093         if (!wpa_s->sched_scan_supported)
1094                 return -1;
1095
1096         if (wpa_s->max_sched_scan_ssids > WPAS_MAX_SCAN_SSIDS)
1097                 max_sched_scan_ssids = WPAS_MAX_SCAN_SSIDS;
1098         else
1099                 max_sched_scan_ssids = wpa_s->max_sched_scan_ssids;
1100         if (max_sched_scan_ssids < 1 || wpa_s->conf->disable_scan_offload)
1101                 return -1;
1102
1103         if (wpa_s->sched_scanning) {
1104                 wpa_dbg(wpa_s, MSG_DEBUG, "Already sched scanning");
1105                 return 0;
1106         }
1107
1108         need_ssids = 0;
1109         for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
1110                 if (!wpas_network_disabled(wpa_s, ssid) && !ssid->scan_ssid) {
1111                         /* Use wildcard SSID to find this network */
1112                         wildcard = 1;
1113                 } else if (!wpas_network_disabled(wpa_s, ssid) &&
1114                            ssid->ssid_len)
1115                         need_ssids++;
1116
1117 #ifdef CONFIG_WPS
1118                 if (!wpas_network_disabled(wpa_s, ssid) &&
1119                     ssid->key_mgmt == WPA_KEY_MGMT_WPS) {
1120                         /*
1121                          * Normal scan is more reliable and faster for WPS
1122                          * operations and since these are for short periods of
1123                          * time, the benefit of trying to use sched_scan would
1124                          * be limited.
1125                          */
1126                         wpa_dbg(wpa_s, MSG_DEBUG, "Use normal scan instead of "
1127                                 "sched_scan for WPS");
1128                         return -1;
1129                 }
1130 #endif /* CONFIG_WPS */
1131         }
1132         if (wildcard)
1133                 need_ssids++;
1134
1135         if (wpa_s->normal_scans < 3 &&
1136             (need_ssids <= wpa_s->max_scan_ssids ||
1137              wpa_s->max_scan_ssids >= (int) max_sched_scan_ssids)) {
1138                 /*
1139                  * When normal scan can speed up operations, use that for the
1140                  * first operations before starting the sched_scan to allow
1141                  * user space sleep more. We do this only if the normal scan
1142                  * has functionality that is suitable for this or if the
1143                  * sched_scan does not have better support for multiple SSIDs.
1144                  */
1145                 wpa_dbg(wpa_s, MSG_DEBUG, "Use normal scan instead of "
1146                         "sched_scan for initial scans (normal_scans=%d)",
1147                         wpa_s->normal_scans);
1148                 return -1;
1149         }
1150
1151         os_memset(&params, 0, sizeof(params));
1152
1153         /* If we can't allocate space for the filters, we just don't filter */
1154         params.filter_ssids = os_calloc(wpa_s->max_match_sets,
1155                                         sizeof(struct wpa_driver_scan_filter));
1156
1157         prev_state = wpa_s->wpa_state;
1158         if (wpa_s->wpa_state == WPA_DISCONNECTED ||
1159             wpa_s->wpa_state == WPA_INACTIVE)
1160                 wpa_supplicant_set_state(wpa_s, WPA_SCANNING);
1161
1162         if (wpa_s->autoscan_params != NULL) {
1163                 scan_params = wpa_s->autoscan_params;
1164                 goto scan;
1165         }
1166
1167         /* Find the starting point from which to continue scanning */
1168         ssid = wpa_s->conf->ssid;
1169         if (wpa_s->prev_sched_ssid) {
1170                 while (ssid) {
1171                         if (ssid == wpa_s->prev_sched_ssid) {
1172                                 ssid = ssid->next;
1173                                 break;
1174                         }
1175                         ssid = ssid->next;
1176                 }
1177         }
1178
1179         if (!ssid || !wpa_s->prev_sched_ssid) {
1180                 wpa_dbg(wpa_s, MSG_DEBUG, "Beginning of SSID list");
1181                 if (wpa_s->conf->sched_scan_interval)
1182                         wpa_s->sched_scan_interval =
1183                                 wpa_s->conf->sched_scan_interval;
1184                 if (wpa_s->sched_scan_interval == 0)
1185                         wpa_s->sched_scan_interval = 10;
1186                 wpa_s->sched_scan_timeout = max_sched_scan_ssids * 2;
1187                 wpa_s->first_sched_scan = 1;
1188                 ssid = wpa_s->conf->ssid;
1189                 wpa_s->prev_sched_ssid = ssid;
1190         }
1191
1192         if (wildcard) {
1193                 wpa_dbg(wpa_s, MSG_DEBUG, "Add wildcard SSID to sched_scan");
1194                 params.num_ssids++;
1195         }
1196
1197         while (ssid) {
1198                 if (wpas_network_disabled(wpa_s, ssid))
1199                         goto next;
1200
1201                 if (params.num_filter_ssids < wpa_s->max_match_sets &&
1202                     params.filter_ssids && ssid->ssid && ssid->ssid_len) {
1203                         wpa_dbg(wpa_s, MSG_DEBUG, "add to filter ssid: %s",
1204                                 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
1205                         os_memcpy(params.filter_ssids[params.num_filter_ssids].ssid,
1206                                   ssid->ssid, ssid->ssid_len);
1207                         params.filter_ssids[params.num_filter_ssids].ssid_len =
1208                                 ssid->ssid_len;
1209                         params.num_filter_ssids++;
1210                 } else if (params.filter_ssids && ssid->ssid && ssid->ssid_len)
1211                 {
1212                         wpa_dbg(wpa_s, MSG_DEBUG, "Not enough room for SSID "
1213                                 "filter for sched_scan - drop filter");
1214                         os_free(params.filter_ssids);
1215                         params.filter_ssids = NULL;
1216                         params.num_filter_ssids = 0;
1217                 }
1218
1219                 if (ssid->scan_ssid && ssid->ssid && ssid->ssid_len) {
1220                         if (params.num_ssids == max_sched_scan_ssids)
1221                                 break; /* only room for broadcast SSID */
1222                         wpa_dbg(wpa_s, MSG_DEBUG,
1223                                 "add to active scan ssid: %s",
1224                                 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
1225                         params.ssids[params.num_ssids].ssid =
1226                                 ssid->ssid;
1227                         params.ssids[params.num_ssids].ssid_len =
1228                                 ssid->ssid_len;
1229                         params.num_ssids++;
1230                         if (params.num_ssids >= max_sched_scan_ssids) {
1231                                 wpa_s->prev_sched_ssid = ssid;
1232                                 do {
1233                                         ssid = ssid->next;
1234                                 } while (ssid &&
1235                                          (wpas_network_disabled(wpa_s, ssid) ||
1236                                           !ssid->scan_ssid));
1237                                 break;
1238                         }
1239                 }
1240
1241         next:
1242                 wpa_s->prev_sched_ssid = ssid;
1243                 ssid = ssid->next;
1244         }
1245
1246         if (params.num_filter_ssids == 0) {
1247                 os_free(params.filter_ssids);
1248                 params.filter_ssids = NULL;
1249         }
1250
1251         extra_ie = wpa_supplicant_extra_ies(wpa_s);
1252         if (extra_ie) {
1253                 params.extra_ies = wpabuf_head(extra_ie);
1254                 params.extra_ies_len = wpabuf_len(extra_ie);
1255         }
1256
1257         if (wpa_s->conf->filter_rssi)
1258                 params.filter_rssi = wpa_s->conf->filter_rssi;
1259
1260         /* See if user specified frequencies. If so, scan only those. */
1261         if (wpa_s->conf->freq_list && !params.freqs) {
1262                 wpa_dbg(wpa_s, MSG_DEBUG,
1263                         "Optimize scan based on conf->freq_list");
1264                 int_array_concat(&params.freqs, wpa_s->conf->freq_list);
1265         }
1266
1267         scan_params = &params;
1268
1269 scan:
1270         if (ssid || !wpa_s->first_sched_scan) {
1271                 wpa_dbg(wpa_s, MSG_DEBUG,
1272                         "Starting sched scan: interval %d timeout %d",
1273                         wpa_s->sched_scan_interval, wpa_s->sched_scan_timeout);
1274         } else {
1275                 wpa_dbg(wpa_s, MSG_DEBUG,
1276                         "Starting sched scan: interval %d (no timeout)",
1277                         wpa_s->sched_scan_interval);
1278         }
1279
1280         wpa_setband_scan_freqs(wpa_s, scan_params);
1281
1282         ret = wpa_supplicant_start_sched_scan(wpa_s, scan_params,
1283                                               wpa_s->sched_scan_interval);
1284         wpabuf_free(extra_ie);
1285         os_free(params.filter_ssids);
1286         if (ret) {
1287                 wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate sched scan");
1288                 if (prev_state != wpa_s->wpa_state)
1289                         wpa_supplicant_set_state(wpa_s, prev_state);
1290                 return ret;
1291         }
1292
1293         /* If we have more SSIDs to scan, add a timeout so we scan them too */
1294         if (ssid || !wpa_s->first_sched_scan) {
1295                 wpa_s->sched_scan_timed_out = 0;
1296                 eloop_register_timeout(wpa_s->sched_scan_timeout, 0,
1297                                        wpa_supplicant_sched_scan_timeout,
1298                                        wpa_s, NULL);
1299                 wpa_s->first_sched_scan = 0;
1300                 wpa_s->sched_scan_timeout /= 2;
1301                 wpa_s->sched_scan_interval *= 2;
1302                 if (wpa_s->sched_scan_timeout < wpa_s->sched_scan_interval) {
1303                         wpa_s->sched_scan_interval = 10;
1304                         wpa_s->sched_scan_timeout = max_sched_scan_ssids * 2;
1305                 }
1306         }
1307
1308         /* If there is no more ssids, start next time from the beginning */
1309         if (!ssid)
1310                 wpa_s->prev_sched_ssid = NULL;
1311
1312         return 0;
1313 }
1314
1315
1316 /**
1317  * wpa_supplicant_cancel_scan - Cancel a scheduled scan request
1318  * @wpa_s: Pointer to wpa_supplicant data
1319  *
1320  * This function is used to cancel a scan request scheduled with
1321  * wpa_supplicant_req_scan().
1322  */
1323 void wpa_supplicant_cancel_scan(struct wpa_supplicant *wpa_s)
1324 {
1325         wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling scan request");
1326         eloop_cancel_timeout(wpa_supplicant_scan, wpa_s, NULL);
1327 }
1328
1329
1330 /**
1331  * wpa_supplicant_cancel_delayed_sched_scan - Stop a delayed scheduled scan
1332  * @wpa_s: Pointer to wpa_supplicant data
1333  *
1334  * This function is used to stop a delayed scheduled scan.
1335  */
1336 void wpa_supplicant_cancel_delayed_sched_scan(struct wpa_supplicant *wpa_s)
1337 {
1338         if (!wpa_s->sched_scan_supported)
1339                 return;
1340
1341         wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling delayed sched scan");
1342         eloop_cancel_timeout(wpa_supplicant_delayed_sched_scan_timeout,
1343                              wpa_s, NULL);
1344 }
1345
1346
1347 /**
1348  * wpa_supplicant_cancel_sched_scan - Stop running scheduled scans
1349  * @wpa_s: Pointer to wpa_supplicant data
1350  *
1351  * This function is used to stop a periodic scheduled scan.
1352  */
1353 void wpa_supplicant_cancel_sched_scan(struct wpa_supplicant *wpa_s)
1354 {
1355         if (!wpa_s->sched_scanning)
1356                 return;
1357
1358         wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling sched scan");
1359         eloop_cancel_timeout(wpa_supplicant_sched_scan_timeout, wpa_s, NULL);
1360         wpa_supplicant_stop_sched_scan(wpa_s);
1361 }
1362
1363
1364 /**
1365  * wpa_supplicant_notify_scanning - Indicate possible scan state change
1366  * @wpa_s: Pointer to wpa_supplicant data
1367  * @scanning: Whether scanning is currently in progress
1368  *
1369  * This function is to generate scanning notifycations. It is called whenever
1370  * there may have been a change in scanning (scan started, completed, stopped).
1371  * wpas_notify_scanning() is called whenever the scanning state changed from the
1372  * previously notified state.
1373  */
1374 void wpa_supplicant_notify_scanning(struct wpa_supplicant *wpa_s,
1375                                     int scanning)
1376 {
1377         if (wpa_s->scanning != scanning) {
1378                 wpa_s->scanning = scanning;
1379                 wpas_notify_scanning(wpa_s);
1380         }
1381 }
1382
1383
1384 static int wpa_scan_get_max_rate(const struct wpa_scan_res *res)
1385 {
1386         int rate = 0;
1387         const u8 *ie;
1388         int i;
1389
1390         ie = wpa_scan_get_ie(res, WLAN_EID_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         ie = wpa_scan_get_ie(res, WLAN_EID_EXT_SUPP_RATES);
1397         for (i = 0; ie && i < ie[1]; i++) {
1398                 if ((ie[i + 2] & 0x7f) > rate)
1399                         rate = ie[i + 2] & 0x7f;
1400         }
1401
1402         return rate;
1403 }
1404
1405
1406 /**
1407  * wpa_scan_get_ie - Fetch a specified information element from a scan result
1408  * @res: Scan result entry
1409  * @ie: Information element identitifier (WLAN_EID_*)
1410  * Returns: Pointer to the information element (id field) or %NULL if not found
1411  *
1412  * This function returns the first matching information element in the scan
1413  * result.
1414  */
1415 const u8 * wpa_scan_get_ie(const struct wpa_scan_res *res, u8 ie)
1416 {
1417         const u8 *end, *pos;
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] == ie)
1426                         return pos;
1427                 pos += 2 + pos[1];
1428         }
1429
1430         return NULL;
1431 }
1432
1433
1434 /**
1435  * wpa_scan_get_vendor_ie - Fetch vendor information element from a scan result
1436  * @res: Scan result entry
1437  * @vendor_type: Vendor type (four octets starting the IE payload)
1438  * Returns: Pointer to the information element (id field) or %NULL if not found
1439  *
1440  * This function returns the first matching information element in the scan
1441  * result.
1442  */
1443 const u8 * wpa_scan_get_vendor_ie(const struct wpa_scan_res *res,
1444                                   u32 vendor_type)
1445 {
1446         const u8 *end, *pos;
1447
1448         pos = (const u8 *) (res + 1);
1449         end = pos + res->ie_len;
1450
1451         while (pos + 1 < end) {
1452                 if (pos + 2 + pos[1] > end)
1453                         break;
1454                 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1455                     vendor_type == WPA_GET_BE32(&pos[2]))
1456                         return pos;
1457                 pos += 2 + pos[1];
1458         }
1459
1460         return NULL;
1461 }
1462
1463
1464 /**
1465  * wpa_scan_get_vendor_ie_beacon - Fetch vendor information from a scan result
1466  * @res: Scan result entry
1467  * @vendor_type: Vendor type (four octets starting the IE payload)
1468  * Returns: Pointer to the information element (id field) or %NULL if not found
1469  *
1470  * This function returns the first matching information element in the scan
1471  * result.
1472  *
1473  * This function is like wpa_scan_get_vendor_ie(), but uses IE buffer only
1474  * from Beacon frames instead of either Beacon or Probe Response frames.
1475  */
1476 const u8 * wpa_scan_get_vendor_ie_beacon(const struct wpa_scan_res *res,
1477                                          u32 vendor_type)
1478 {
1479         const u8 *end, *pos;
1480
1481         if (res->beacon_ie_len == 0)
1482                 return NULL;
1483
1484         pos = (const u8 *) (res + 1);
1485         pos += res->ie_len;
1486         end = pos + res->beacon_ie_len;
1487
1488         while (pos + 1 < end) {
1489                 if (pos + 2 + pos[1] > end)
1490                         break;
1491                 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1492                     vendor_type == WPA_GET_BE32(&pos[2]))
1493                         return pos;
1494                 pos += 2 + pos[1];
1495         }
1496
1497         return NULL;
1498 }
1499
1500
1501 /**
1502  * wpa_scan_get_vendor_ie_multi - Fetch vendor IE data from a scan result
1503  * @res: Scan result entry
1504  * @vendor_type: Vendor type (four octets starting the IE payload)
1505  * Returns: Pointer to the information element payload or %NULL if not found
1506  *
1507  * This function returns concatenated payload of possibly fragmented vendor
1508  * specific information elements in the scan result. The caller is responsible
1509  * for freeing the returned buffer.
1510  */
1511 struct wpabuf * wpa_scan_get_vendor_ie_multi(const struct wpa_scan_res *res,
1512                                              u32 vendor_type)
1513 {
1514         struct wpabuf *buf;
1515         const u8 *end, *pos;
1516
1517         buf = wpabuf_alloc(res->ie_len);
1518         if (buf == NULL)
1519                 return NULL;
1520
1521         pos = (const u8 *) (res + 1);
1522         end = pos + res->ie_len;
1523
1524         while (pos + 1 < end) {
1525                 if (pos + 2 + pos[1] > end)
1526                         break;
1527                 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1528                     vendor_type == WPA_GET_BE32(&pos[2]))
1529                         wpabuf_put_data(buf, pos + 2 + 4, pos[1] - 4);
1530                 pos += 2 + pos[1];
1531         }
1532
1533         if (wpabuf_len(buf) == 0) {
1534                 wpabuf_free(buf);
1535                 buf = NULL;
1536         }
1537
1538         return buf;
1539 }
1540
1541
1542 /*
1543  * Channels with a great SNR can operate at full rate. What is a great SNR?
1544  * This doc https://supportforums.cisco.com/docs/DOC-12954 says, "the general
1545  * rule of thumb is that any SNR above 20 is good." This one
1546  * http://www.cisco.com/en/US/tech/tk722/tk809/technologies_q_and_a_item09186a00805e9a96.shtml#qa23
1547  * recommends 25 as a minimum SNR for 54 Mbps data rate. 30 is chosen here as a
1548  * conservative value.
1549  */
1550 #define GREAT_SNR 30
1551
1552 /* Compare function for sorting scan results. Return >0 if @b is considered
1553  * better. */
1554 static int wpa_scan_result_compar(const void *a, const void *b)
1555 {
1556 #define IS_5GHZ(n) (n > 4000)
1557 #define MIN(a,b) a < b ? a : b
1558         struct wpa_scan_res **_wa = (void *) a;
1559         struct wpa_scan_res **_wb = (void *) b;
1560         struct wpa_scan_res *wa = *_wa;
1561         struct wpa_scan_res *wb = *_wb;
1562         int wpa_a, wpa_b, maxrate_a, maxrate_b;
1563         int snr_a, snr_b;
1564
1565         /* WPA/WPA2 support preferred */
1566         wpa_a = wpa_scan_get_vendor_ie(wa, WPA_IE_VENDOR_TYPE) != NULL ||
1567                 wpa_scan_get_ie(wa, WLAN_EID_RSN) != NULL;
1568         wpa_b = wpa_scan_get_vendor_ie(wb, WPA_IE_VENDOR_TYPE) != NULL ||
1569                 wpa_scan_get_ie(wb, WLAN_EID_RSN) != NULL;
1570
1571         if (wpa_b && !wpa_a)
1572                 return 1;
1573         if (!wpa_b && wpa_a)
1574                 return -1;
1575
1576         /* privacy support preferred */
1577         if ((wa->caps & IEEE80211_CAP_PRIVACY) == 0 &&
1578             (wb->caps & IEEE80211_CAP_PRIVACY))
1579                 return 1;
1580         if ((wa->caps & IEEE80211_CAP_PRIVACY) &&
1581             (wb->caps & IEEE80211_CAP_PRIVACY) == 0)
1582                 return -1;
1583
1584         if ((wa->flags & wb->flags & WPA_SCAN_LEVEL_DBM) &&
1585             !((wa->flags | wb->flags) & WPA_SCAN_NOISE_INVALID)) {
1586                 snr_a = MIN(wa->level - wa->noise, GREAT_SNR);
1587                 snr_b = MIN(wb->level - wb->noise, GREAT_SNR);
1588         } else {
1589                 /* Not suitable information to calculate SNR, so use level */
1590                 snr_a = wa->level;
1591                 snr_b = wb->level;
1592         }
1593
1594         /* best/max rate preferred if SNR close enough */
1595         if ((snr_a && snr_b && abs(snr_b - snr_a) < 5) ||
1596             (wa->qual && wb->qual && abs(wb->qual - wa->qual) < 10)) {
1597                 maxrate_a = wpa_scan_get_max_rate(wa);
1598                 maxrate_b = wpa_scan_get_max_rate(wb);
1599                 if (maxrate_a != maxrate_b)
1600                         return maxrate_b - maxrate_a;
1601                 if (IS_5GHZ(wa->freq) ^ IS_5GHZ(wb->freq))
1602                         return IS_5GHZ(wa->freq) ? -1 : 1;
1603         }
1604
1605         /* use freq for channel preference */
1606
1607         /* all things being equal, use SNR; if SNRs are
1608          * identical, use quality values since some drivers may only report
1609          * that value and leave the signal level zero */
1610         if (snr_b == snr_a)
1611                 return wb->qual - wa->qual;
1612         return snr_b - snr_a;
1613 #undef MIN
1614 #undef IS_5GHZ
1615 }
1616
1617
1618 #ifdef CONFIG_WPS
1619 /* Compare function for sorting scan results when searching a WPS AP for
1620  * provisioning. Return >0 if @b is considered better. */
1621 static int wpa_scan_result_wps_compar(const void *a, const void *b)
1622 {
1623         struct wpa_scan_res **_wa = (void *) a;
1624         struct wpa_scan_res **_wb = (void *) b;
1625         struct wpa_scan_res *wa = *_wa;
1626         struct wpa_scan_res *wb = *_wb;
1627         int uses_wps_a, uses_wps_b;
1628         struct wpabuf *wps_a, *wps_b;
1629         int res;
1630
1631         /* Optimization - check WPS IE existence before allocated memory and
1632          * doing full reassembly. */
1633         uses_wps_a = wpa_scan_get_vendor_ie(wa, WPS_IE_VENDOR_TYPE) != NULL;
1634         uses_wps_b = wpa_scan_get_vendor_ie(wb, WPS_IE_VENDOR_TYPE) != NULL;
1635         if (uses_wps_a && !uses_wps_b)
1636                 return -1;
1637         if (!uses_wps_a && uses_wps_b)
1638                 return 1;
1639
1640         if (uses_wps_a && uses_wps_b) {
1641                 wps_a = wpa_scan_get_vendor_ie_multi(wa, WPS_IE_VENDOR_TYPE);
1642                 wps_b = wpa_scan_get_vendor_ie_multi(wb, WPS_IE_VENDOR_TYPE);
1643                 res = wps_ap_priority_compar(wps_a, wps_b);
1644                 wpabuf_free(wps_a);
1645                 wpabuf_free(wps_b);
1646                 if (res)
1647                         return res;
1648         }
1649
1650         /*
1651          * Do not use current AP security policy as a sorting criteria during
1652          * WPS provisioning step since the AP may get reconfigured at the
1653          * completion of provisioning.
1654          */
1655
1656         /* all things being equal, use signal level; if signal levels are
1657          * identical, use quality values since some drivers may only report
1658          * that value and leave the signal level zero */
1659         if (wb->level == wa->level)
1660                 return wb->qual - wa->qual;
1661         return wb->level - wa->level;
1662 }
1663 #endif /* CONFIG_WPS */
1664
1665
1666 static void dump_scan_res(struct wpa_scan_results *scan_res)
1667 {
1668 #ifndef CONFIG_NO_STDOUT_DEBUG
1669         size_t i;
1670
1671         if (scan_res->res == NULL || scan_res->num == 0)
1672                 return;
1673
1674         wpa_printf(MSG_EXCESSIVE, "Sorted scan results");
1675
1676         for (i = 0; i < scan_res->num; i++) {
1677                 struct wpa_scan_res *r = scan_res->res[i];
1678                 u8 *pos;
1679                 if ((r->flags & (WPA_SCAN_LEVEL_DBM | WPA_SCAN_NOISE_INVALID))
1680                     == WPA_SCAN_LEVEL_DBM) {
1681                         int snr = r->level - r->noise;
1682                         wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d "
1683                                    "noise=%d level=%d snr=%d%s flags=0x%x "
1684                                    "age=%u",
1685                                    MAC2STR(r->bssid), r->freq, r->qual,
1686                                    r->noise, r->level, snr,
1687                                    snr >= GREAT_SNR ? "*" : "", r->flags,
1688                                    r->age);
1689                 } else {
1690                         wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d "
1691                                    "noise=%d level=%d flags=0x%x age=%u",
1692                                    MAC2STR(r->bssid), r->freq, r->qual,
1693                                    r->noise, r->level, r->flags, r->age);
1694                 }
1695                 pos = (u8 *) (r + 1);
1696                 if (r->ie_len)
1697                         wpa_hexdump(MSG_EXCESSIVE, "IEs", pos, r->ie_len);
1698                 pos += r->ie_len;
1699                 if (r->beacon_ie_len)
1700                         wpa_hexdump(MSG_EXCESSIVE, "Beacon IEs",
1701                                     pos, r->beacon_ie_len);
1702         }
1703 #endif /* CONFIG_NO_STDOUT_DEBUG */
1704 }
1705
1706
1707 /**
1708  * wpa_supplicant_filter_bssid_match - Is the specified BSSID allowed
1709  * @wpa_s: Pointer to wpa_supplicant data
1710  * @bssid: BSSID to check
1711  * Returns: 0 if the BSSID is filtered or 1 if not
1712  *
1713  * This function is used to filter out specific BSSIDs from scan reslts mainly
1714  * for testing purposes (SET bssid_filter ctrl_iface command).
1715  */
1716 int wpa_supplicant_filter_bssid_match(struct wpa_supplicant *wpa_s,
1717                                       const u8 *bssid)
1718 {
1719         size_t i;
1720
1721         if (wpa_s->bssid_filter == NULL)
1722                 return 1;
1723
1724         for (i = 0; i < wpa_s->bssid_filter_count; i++) {
1725                 if (os_memcmp(wpa_s->bssid_filter + i * ETH_ALEN, bssid,
1726                               ETH_ALEN) == 0)
1727                         return 1;
1728         }
1729
1730         return 0;
1731 }
1732
1733
1734 static void filter_scan_res(struct wpa_supplicant *wpa_s,
1735                             struct wpa_scan_results *res)
1736 {
1737         size_t i, j;
1738
1739         if (wpa_s->bssid_filter == NULL)
1740                 return;
1741
1742         for (i = 0, j = 0; i < res->num; i++) {
1743                 if (wpa_supplicant_filter_bssid_match(wpa_s,
1744                                                       res->res[i]->bssid)) {
1745                         res->res[j++] = res->res[i];
1746                 } else {
1747                         os_free(res->res[i]);
1748                         res->res[i] = NULL;
1749                 }
1750         }
1751
1752         if (res->num != j) {
1753                 wpa_printf(MSG_DEBUG, "Filtered out %d scan results",
1754                            (int) (res->num - j));
1755                 res->num = j;
1756         }
1757 }
1758
1759
1760 /**
1761  * wpa_supplicant_get_scan_results - Get scan results
1762  * @wpa_s: Pointer to wpa_supplicant data
1763  * @info: Information about what was scanned or %NULL if not available
1764  * @new_scan: Whether a new scan was performed
1765  * Returns: Scan results, %NULL on failure
1766  *
1767  * This function request the current scan results from the driver and updates
1768  * the local BSS list wpa_s->bss. The caller is responsible for freeing the
1769  * results with wpa_scan_results_free().
1770  */
1771 struct wpa_scan_results *
1772 wpa_supplicant_get_scan_results(struct wpa_supplicant *wpa_s,
1773                                 struct scan_info *info, int new_scan)
1774 {
1775         struct wpa_scan_results *scan_res;
1776         size_t i;
1777         int (*compar)(const void *, const void *) = wpa_scan_result_compar;
1778
1779         scan_res = wpa_drv_get_scan_results2(wpa_s);
1780         if (scan_res == NULL) {
1781                 wpa_dbg(wpa_s, MSG_DEBUG, "Failed to get scan results");
1782                 return NULL;
1783         }
1784         if (scan_res->fetch_time.sec == 0) {
1785                 /*
1786                  * Make sure we have a valid timestamp if the driver wrapper
1787                  * does not set this.
1788                  */
1789                 os_get_reltime(&scan_res->fetch_time);
1790         }
1791         filter_scan_res(wpa_s, scan_res);
1792
1793 #ifdef CONFIG_WPS
1794         if (wpas_wps_searching(wpa_s)) {
1795                 wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Order scan results with WPS "
1796                         "provisioning rules");
1797                 compar = wpa_scan_result_wps_compar;
1798         }
1799 #endif /* CONFIG_WPS */
1800
1801         qsort(scan_res->res, scan_res->num, sizeof(struct wpa_scan_res *),
1802               compar);
1803         dump_scan_res(scan_res);
1804
1805         wpa_bss_update_start(wpa_s);
1806         for (i = 0; i < scan_res->num; i++)
1807                 wpa_bss_update_scan_res(wpa_s, scan_res->res[i],
1808                                         &scan_res->fetch_time);
1809         wpa_bss_update_end(wpa_s, info, new_scan);
1810
1811         return scan_res;
1812 }
1813
1814
1815 /**
1816  * wpa_supplicant_update_scan_results - Update scan results from the driver
1817  * @wpa_s: Pointer to wpa_supplicant data
1818  * Returns: 0 on success, -1 on failure
1819  *
1820  * This function updates the BSS table within wpa_supplicant based on the
1821  * currently available scan results from the driver without requesting a new
1822  * scan. This is used in cases where the driver indicates an association
1823  * (including roaming within ESS) and wpa_supplicant does not yet have the
1824  * needed information to complete the connection (e.g., to perform validation
1825  * steps in 4-way handshake).
1826  */
1827 int wpa_supplicant_update_scan_results(struct wpa_supplicant *wpa_s)
1828 {
1829         struct wpa_scan_results *scan_res;
1830         scan_res = wpa_supplicant_get_scan_results(wpa_s, NULL, 0);
1831         if (scan_res == NULL)
1832                 return -1;
1833         wpa_scan_results_free(scan_res);
1834
1835         return 0;
1836 }
1837
1838
1839 /**
1840  * scan_only_handler - Reports scan results
1841  */
1842 void scan_only_handler(struct wpa_supplicant *wpa_s,
1843                        struct wpa_scan_results *scan_res)
1844 {
1845         wpa_dbg(wpa_s, MSG_DEBUG, "Scan-only results received");
1846         if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
1847             wpa_s->manual_scan_use_id && wpa_s->own_scan_running) {
1848                 wpa_msg_ctrl(wpa_s, MSG_INFO, WPA_EVENT_SCAN_RESULTS "id=%u",
1849                              wpa_s->manual_scan_id);
1850                 wpa_s->manual_scan_use_id = 0;
1851         } else {
1852                 wpa_msg_ctrl(wpa_s, MSG_INFO, WPA_EVENT_SCAN_RESULTS);
1853         }
1854         wpas_notify_scan_results(wpa_s);
1855         wpas_notify_scan_done(wpa_s, 1);
1856         if (wpa_s->scan_work) {
1857                 struct wpa_radio_work *work = wpa_s->scan_work;
1858                 wpa_s->scan_work = NULL;
1859                 radio_work_done(work);
1860         }
1861 }
1862
1863
1864 int wpas_scan_scheduled(struct wpa_supplicant *wpa_s)
1865 {
1866         return eloop_is_timeout_registered(wpa_supplicant_scan, wpa_s, NULL);
1867 }
1868
1869
1870 struct wpa_driver_scan_params *
1871 wpa_scan_clone_params(const struct wpa_driver_scan_params *src)
1872 {
1873         struct wpa_driver_scan_params *params;
1874         size_t i;
1875         u8 *n;
1876
1877         params = os_zalloc(sizeof(*params));
1878         if (params == NULL)
1879                 return NULL;
1880
1881         for (i = 0; i < src->num_ssids; i++) {
1882                 if (src->ssids[i].ssid) {
1883                         n = os_malloc(src->ssids[i].ssid_len);
1884                         if (n == NULL)
1885                                 goto failed;
1886                         os_memcpy(n, src->ssids[i].ssid,
1887                                   src->ssids[i].ssid_len);
1888                         params->ssids[i].ssid = n;
1889                         params->ssids[i].ssid_len = src->ssids[i].ssid_len;
1890                 }
1891         }
1892         params->num_ssids = src->num_ssids;
1893
1894         if (src->extra_ies) {
1895                 n = os_malloc(src->extra_ies_len);
1896                 if (n == NULL)
1897                         goto failed;
1898                 os_memcpy(n, src->extra_ies, src->extra_ies_len);
1899                 params->extra_ies = n;
1900                 params->extra_ies_len = src->extra_ies_len;
1901         }
1902
1903         if (src->freqs) {
1904                 int len = int_array_len(src->freqs);
1905                 params->freqs = os_malloc((len + 1) * sizeof(int));
1906                 if (params->freqs == NULL)
1907                         goto failed;
1908                 os_memcpy(params->freqs, src->freqs, (len + 1) * sizeof(int));
1909         }
1910
1911         if (src->filter_ssids) {
1912                 params->filter_ssids = os_malloc(sizeof(*params->filter_ssids) *
1913                                                  src->num_filter_ssids);
1914                 if (params->filter_ssids == NULL)
1915                         goto failed;
1916                 os_memcpy(params->filter_ssids, src->filter_ssids,
1917                           sizeof(*params->filter_ssids) *
1918                           src->num_filter_ssids);
1919                 params->num_filter_ssids = src->num_filter_ssids;
1920         }
1921
1922         params->filter_rssi = src->filter_rssi;
1923         params->p2p_probe = src->p2p_probe;
1924         params->only_new_results = src->only_new_results;
1925         params->low_priority = src->low_priority;
1926
1927         return params;
1928
1929 failed:
1930         wpa_scan_free_params(params);
1931         return NULL;
1932 }
1933
1934
1935 void wpa_scan_free_params(struct wpa_driver_scan_params *params)
1936 {
1937         size_t i;
1938
1939         if (params == NULL)
1940                 return;
1941
1942         for (i = 0; i < params->num_ssids; i++)
1943                 os_free((u8 *) params->ssids[i].ssid);
1944         os_free((u8 *) params->extra_ies);
1945         os_free(params->freqs);
1946         os_free(params->filter_ssids);
1947         os_free(params);
1948 }
1949
1950
1951 int wpas_start_pno(struct wpa_supplicant *wpa_s)
1952 {
1953         int ret, interval;
1954         size_t i, num_ssid, num_match_ssid;
1955         struct wpa_ssid *ssid;
1956         struct wpa_driver_scan_params params;
1957
1958         if (!wpa_s->sched_scan_supported)
1959                 return -1;
1960
1961         if (wpa_s->pno || wpa_s->pno_sched_pending)
1962                 return 0;
1963
1964         if ((wpa_s->wpa_state > WPA_SCANNING) &&
1965             (wpa_s->wpa_state <= WPA_COMPLETED)) {
1966                 wpa_printf(MSG_ERROR, "PNO: In assoc process");
1967                 return -EAGAIN;
1968         }
1969
1970         if (wpa_s->wpa_state == WPA_SCANNING) {
1971                 wpa_supplicant_cancel_scan(wpa_s);
1972                 if (wpa_s->sched_scanning) {
1973                         wpa_printf(MSG_DEBUG, "Schedule PNO on completion of "
1974                                    "ongoing sched scan");
1975                         wpa_supplicant_cancel_sched_scan(wpa_s);
1976                         wpa_s->pno_sched_pending = 1;
1977                         return 0;
1978                 }
1979         }
1980
1981         os_memset(&params, 0, sizeof(params));
1982
1983         num_ssid = num_match_ssid = 0;
1984         ssid = wpa_s->conf->ssid;
1985         while (ssid) {
1986                 if (!wpas_network_disabled(wpa_s, ssid)) {
1987                         num_match_ssid++;
1988                         if (ssid->scan_ssid)
1989                                 num_ssid++;
1990                 }
1991                 ssid = ssid->next;
1992         }
1993
1994         if (num_match_ssid == 0) {
1995                 wpa_printf(MSG_DEBUG, "PNO: No configured SSIDs");
1996                 return -1;
1997         }
1998
1999         if (num_match_ssid > num_ssid) {
2000                 params.num_ssids++; /* wildcard */
2001                 num_ssid++;
2002         }
2003
2004         if (num_ssid > WPAS_MAX_SCAN_SSIDS) {
2005                 wpa_printf(MSG_DEBUG, "PNO: Use only the first %u SSIDs from "
2006                            "%u", WPAS_MAX_SCAN_SSIDS, (unsigned int) num_ssid);
2007                 num_ssid = WPAS_MAX_SCAN_SSIDS;
2008         }
2009
2010         if (num_match_ssid > wpa_s->max_match_sets) {
2011                 num_match_ssid = wpa_s->max_match_sets;
2012                 wpa_dbg(wpa_s, MSG_DEBUG, "PNO: Too many SSIDs to match");
2013         }
2014         params.filter_ssids = os_calloc(num_match_ssid,
2015                                         sizeof(struct wpa_driver_scan_filter));
2016         if (params.filter_ssids == NULL)
2017                 return -1;
2018         i = 0;
2019         ssid = wpa_s->conf->ssid;
2020         while (ssid) {
2021                 if (!wpas_network_disabled(wpa_s, ssid)) {
2022                         if (ssid->scan_ssid && params.num_ssids < num_ssid) {
2023                                 params.ssids[params.num_ssids].ssid =
2024                                         ssid->ssid;
2025                                 params.ssids[params.num_ssids].ssid_len =
2026                                          ssid->ssid_len;
2027                                 params.num_ssids++;
2028                         }
2029                         os_memcpy(params.filter_ssids[i].ssid, ssid->ssid,
2030                                   ssid->ssid_len);
2031                         params.filter_ssids[i].ssid_len = ssid->ssid_len;
2032                         params.num_filter_ssids++;
2033                         i++;
2034                         if (i == num_match_ssid)
2035                                 break;
2036                 }
2037                 ssid = ssid->next;
2038         }
2039
2040         if (wpa_s->conf->filter_rssi)
2041                 params.filter_rssi = wpa_s->conf->filter_rssi;
2042
2043         interval = wpa_s->conf->sched_scan_interval ?
2044                 wpa_s->conf->sched_scan_interval : 10;
2045
2046         if (params.freqs == NULL && wpa_s->manual_sched_scan_freqs) {
2047                 wpa_dbg(wpa_s, MSG_DEBUG, "Limit sched scan to specified channels");
2048                 params.freqs = wpa_s->manual_sched_scan_freqs;
2049         }
2050
2051         ret = wpa_supplicant_start_sched_scan(wpa_s, &params, interval);
2052         os_free(params.filter_ssids);
2053         if (ret == 0)
2054                 wpa_s->pno = 1;
2055         else
2056                 wpa_msg(wpa_s, MSG_ERROR, "Failed to schedule PNO");
2057         return ret;
2058 }
2059
2060
2061 int wpas_stop_pno(struct wpa_supplicant *wpa_s)
2062 {
2063         int ret = 0;
2064
2065         if (!wpa_s->pno)
2066                 return 0;
2067
2068         ret = wpa_supplicant_stop_sched_scan(wpa_s);
2069
2070         wpa_s->pno = 0;
2071         wpa_s->pno_sched_pending = 0;
2072
2073         if (wpa_s->wpa_state == WPA_SCANNING)
2074                 wpa_supplicant_req_scan(wpa_s, 0, 0);
2075
2076         return ret;
2077 }