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_prog;
 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_prog = wpas_p2p_in_progress(wpa_s);
 662         if (p2p_in_prog && p2p_in_prog != 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;
 820                      wpa_s->last_scan_req != MANUAL_SCAN_REQ && tssid;
 821                      tssid = tssid->next) {
 822                         if (wpas_network_disabled(wpa_s, tssid))
 823                                 continue;
 824                         if ((params.freqs || !freqs_set) && tssid->scan_freq) {
 825                                 int_array_concat(&params.freqs,
 826                                                  tssid->scan_freq);
 827                         } else {
 828                                 os_free(params.freqs);
 829                                 params.freqs = NULL;
 830                         }
 831                         freqs_set = 1;
 832                 }
 833                 int_array_sort_unique(params.freqs);
 834         }
 835
 836         if (ssid && max_ssids == 1) {
 837                 /*
 838                  * If the driver is limited to 1 SSID at a time interleave
 839                  * wildcard SSID scans with specific SSID scans to avoid
 840                  * waiting a long time for a wildcard scan.
 841                  */
 842                 if (!wpa_s->prev_scan_wildcard) {
 843                         params.ssids[0].ssid = NULL;
 844                         params.ssids[0].ssid_len = 0;
 845                         wpa_s->prev_scan_wildcard = 1;
 846                         wpa_dbg(wpa_s, MSG_DEBUG, "Starting AP scan for "
 847                                 "wildcard SSID (Interleave with specific)");
 848                 } else {
 849                         wpa_s->prev_scan_ssid = ssid;
 850                         wpa_s->prev_scan_wildcard = 0;
 851                         wpa_dbg(wpa_s, MSG_DEBUG,
 852                                 "Starting AP scan for specific SSID: %s",
 853                                 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
 854                 }
 855         } else if (ssid) {
 856                 /* max_ssids > 1 */
 857
 858                 wpa_s->prev_scan_ssid = ssid;
 859                 wpa_dbg(wpa_s, MSG_DEBUG, "Include wildcard SSID in "
 860                         "the scan request");
 861                 params.num_ssids++;
 862         } else if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
 863                    wpa_s->manual_scan_passive && params.num_ssids == 0) {
 864                 wpa_dbg(wpa_s, MSG_DEBUG, "Use passive scan based on manual request");
 865         } else {
 866                 wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
 867                 params.num_ssids++;
 868                 wpa_dbg(wpa_s, MSG_DEBUG, "Starting AP scan for wildcard "
 869                         "SSID");
 870         }
 871 #ifdef CONFIG_P2P
 872 ssid_list_set:
 873 #endif /* CONFIG_P2P */
 874
 875         wpa_supplicant_optimize_freqs(wpa_s, &params);
 876         extra_ie = wpa_supplicant_extra_ies(wpa_s);
 877
 878         if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
 879             wpa_s->manual_scan_only_new)
 880                 params.only_new_results = 1;
 881
 882         if (wpa_s->last_scan_req == MANUAL_SCAN_REQ && params.freqs == NULL &&
 883             wpa_s->manual_scan_freqs) {
 884                 wpa_dbg(wpa_s, MSG_DEBUG, "Limit manual scan to specified channels");
 885                 params.freqs = wpa_s->manual_scan_freqs;
 886                 wpa_s->manual_scan_freqs = NULL;
 887         }
 888
 889         if (params.freqs == NULL && wpa_s->next_scan_freqs) {
 890                 wpa_dbg(wpa_s, MSG_DEBUG, "Optimize scan based on previously "
 891                         "generated frequency list");
 892                 params.freqs = wpa_s->next_scan_freqs;
 893         } else
 894                 os_free(wpa_s->next_scan_freqs);
 895         wpa_s->next_scan_freqs = NULL;
 896         wpa_setband_scan_freqs(wpa_s, &params);
 897
 898         /* See if user specified frequencies. If so, scan only those. */
 899         if (wpa_s->conf->freq_list && !params.freqs) {
 900                 wpa_dbg(wpa_s, MSG_DEBUG,
 901                         "Optimize scan based on conf->freq_list");
 902                 int_array_concat(&params.freqs, wpa_s->conf->freq_list);
 903         }
 904
 905         /* Use current associated channel? */
 906         if (wpa_s->conf->scan_cur_freq && !params.freqs) {
 907                 unsigned int num = wpa_s->num_multichan_concurrent;
 908
 909                 params.freqs = os_calloc(num + 1, sizeof(int));
 910                 if (params.freqs) {
 911                         num = get_shared_radio_freqs(wpa_s, params.freqs, num);
 912                         if (num > 0) {
 913                                 wpa_dbg(wpa_s, MSG_DEBUG, "Scan only the "
 914                                         "current operating channels since "
 915                                         "scan_cur_freq is enabled");
 916                         } else {
 917                                 os_free(params.freqs);
 918                                 params.freqs = NULL;
 919                         }
 920                 }
 921         }
 922
 923         params.filter_ssids = wpa_supplicant_build_filter_ssids(
 924                 wpa_s->conf, &params.num_filter_ssids);
 925         if (extra_ie) {
 926                 params.extra_ies = wpabuf_head(extra_ie);
 927                 params.extra_ies_len = wpabuf_len(extra_ie);
 928         }
 929
 930 #ifdef CONFIG_P2P
 931         if (wpa_s->p2p_in_provisioning || wpa_s->p2p_in_invitation ||
 932             (wpa_s->show_group_started && wpa_s->go_params)) {
 933                 /*
 934                  * The interface may not yet be in P2P mode, so we have to
 935                  * explicitly request P2P probe to disable CCK rates.
 936                  */
 937                 params.p2p_probe = 1;
 938         }
 939 #endif /* CONFIG_P2P */
 940
 941         if (wpa_s->mac_addr_rand_enable & MAC_ADDR_RAND_SCAN) {
 942                 params.mac_addr_rand = 1;
 943                 if (wpa_s->mac_addr_scan) {
 944                         params.mac_addr = wpa_s->mac_addr_scan;
 945                         params.mac_addr_mask = wpa_s->mac_addr_scan + ETH_ALEN;
 946                 }
 947         }
 948
 949         scan_params = &params;
 950
 951 scan:
 952 #ifdef CONFIG_P2P
 953         /*
 954          * If the driver does not support multi-channel concurrency and a
 955          * virtual interface that shares the same radio with the wpa_s interface
 956          * is operating there may not be need to scan other channels apart from
 957          * the current operating channel on the other virtual interface. Filter
 958          * out other channels in case we are trying to find a connection for a
 959          * station interface when we are not configured to prefer station
 960          * connection and a concurrent operation is already in process.
 961          */
 962         if (wpa_s->scan_for_connection &&
 963             wpa_s->last_scan_req == NORMAL_SCAN_REQ &&
 964             !scan_params->freqs && !params.freqs &&
 965             wpas_is_p2p_prioritized(wpa_s) &&
 966             wpa_s->p2p_group_interface == NOT_P2P_GROUP_INTERFACE &&
 967             non_p2p_network_enabled(wpa_s)) {
 968                 unsigned int num = wpa_s->num_multichan_concurrent;
 969
 970                 params.freqs = os_calloc(num + 1, sizeof(int));
 971                 if (params.freqs) {
 972                         num = get_shared_radio_freqs(wpa_s, params.freqs, num);
 973                         if (num > 0 && num == wpa_s->num_multichan_concurrent) {
 974                                 wpa_dbg(wpa_s, MSG_DEBUG, "Scan only the current operating channels since all channels are already used");
 975                         } else {
 976                                 os_free(params.freqs);
 977                                 params.freqs = NULL;
 978                         }
 979                 }
 980         }
 981 #endif /* CONFIG_P2P */
 982
 983         ret = wpa_supplicant_trigger_scan(wpa_s, scan_params);
 984
 985         if (ret && wpa_s->last_scan_req == MANUAL_SCAN_REQ && params.freqs &&
 986             !wpa_s->manual_scan_freqs) {
 987                 /* Restore manual_scan_freqs for the next attempt */
 988                 wpa_s->manual_scan_freqs = params.freqs;
 989                 params.freqs = NULL;
 990         }
 991
 992         wpabuf_free(extra_ie);
 993         os_free(params.freqs);
 994         os_free(params.filter_ssids);
 995
 996         if (ret) {
 997                 wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate AP scan");
 998                 if (prev_state != wpa_s->wpa_state)
 999                         wpa_supplicant_set_state(wpa_s, prev_state);
1000                 /* Restore scan_req since we will try to scan again */
1001                 wpa_s->scan_req = wpa_s->last_scan_req;
1002                 wpa_supplicant_req_scan(wpa_s, 1, 0);
1003         } else {
1004                 wpa_s->scan_for_connection = 0;
1005 #ifdef CONFIG_INTERWORKING
1006                 wpa_s->interworking_fast_assoc_tried = 0;
1007 #endif /* CONFIG_INTERWORKING */
1008         }
1009 }
1010
1011
1012 void wpa_supplicant_update_scan_int(struct wpa_supplicant *wpa_s, int sec)
1013 {
1014         struct os_reltime remaining, new_int;
1015         int cancelled;
1016
1017         cancelled = eloop_cancel_timeout_one(wpa_supplicant_scan, wpa_s, NULL,
1018                                              &remaining);
1019
1020         new_int.sec = sec;
1021         new_int.usec = 0;
1022         if (cancelled && os_reltime_before(&remaining, &new_int)) {
1023                 new_int.sec = remaining.sec;
1024                 new_int.usec = remaining.usec;
1025         }
1026
1027         if (cancelled) {
1028                 eloop_register_timeout(new_int.sec, new_int.usec,
1029                                        wpa_supplicant_scan, wpa_s, NULL);
1030         }
1031         wpa_s->scan_interval = sec;
1032 }
1033
1034
1035 /**
1036  * wpa_supplicant_req_scan - Schedule a scan for neighboring access points
1037  * @wpa_s: Pointer to wpa_supplicant data
1038  * @sec: Number of seconds after which to scan
1039  * @usec: Number of microseconds after which to scan
1040  *
1041  * This function is used to schedule a scan for neighboring access points after
1042  * the specified time.
1043  */
1044 void wpa_supplicant_req_scan(struct wpa_supplicant *wpa_s, int sec, int usec)
1045 {
1046         int res = eloop_deplete_timeout(sec, usec, wpa_supplicant_scan, wpa_s,
1047                                         NULL);
1048         if (res == 1) {
1049                 wpa_dbg(wpa_s, MSG_DEBUG, "Rescheduling scan request: %d.%06d sec",
1050                         sec, usec);
1051         } else if (res == 0) {
1052                 wpa_dbg(wpa_s, MSG_DEBUG, "Ignore new scan request for %d.%06d sec since an earlier request is scheduled to trigger sooner",
1053                         sec, usec);
1054         } else {
1055                 wpa_dbg(wpa_s, MSG_DEBUG, "Setting scan request: %d.%06d sec",
1056                         sec, usec);
1057                 eloop_register_timeout(sec, usec, wpa_supplicant_scan, wpa_s, NULL);
1058         }
1059 }
1060
1061
1062 /**
1063  * wpa_supplicant_delayed_sched_scan - Request a delayed scheduled scan
1064  * @wpa_s: Pointer to wpa_supplicant data
1065  * @sec: Number of seconds after which to scan
1066  * @usec: Number of microseconds after which to scan
1067  * Returns: 0 on success or -1 otherwise
1068  *
1069  * This function is used to schedule periodic scans for neighboring
1070  * access points after the specified time.
1071  */
1072 int wpa_supplicant_delayed_sched_scan(struct wpa_supplicant *wpa_s,
1073                                       int sec, int usec)
1074 {
1075         if (!wpa_s->sched_scan_supported)
1076                 return -1;
1077
1078         eloop_register_timeout(sec, usec,
1079                                wpa_supplicant_delayed_sched_scan_timeout,
1080                                wpa_s, NULL);
1081
1082         return 0;
1083 }
1084
1085
1086 /**
1087  * wpa_supplicant_req_sched_scan - Start a periodic scheduled scan
1088  * @wpa_s: Pointer to wpa_supplicant data
1089  * Returns: 0 is sched_scan was started or -1 otherwise
1090  *
1091  * This function is used to schedule periodic scans for neighboring
1092  * access points repeating the scan continuously.
1093  */
1094 int wpa_supplicant_req_sched_scan(struct wpa_supplicant *wpa_s)
1095 {
1096         struct wpa_driver_scan_params params;
1097         struct wpa_driver_scan_params *scan_params;
1098         enum wpa_states prev_state;
1099         struct wpa_ssid *ssid = NULL;
1100         struct wpabuf *extra_ie = NULL;
1101         int ret;
1102         unsigned int max_sched_scan_ssids;
1103         int wildcard = 0;
1104         int need_ssids;
1105
1106         if (!wpa_s->sched_scan_supported)
1107                 return -1;
1108
1109         if (wpa_s->max_sched_scan_ssids > WPAS_MAX_SCAN_SSIDS)
1110                 max_sched_scan_ssids = WPAS_MAX_SCAN_SSIDS;
1111         else
1112                 max_sched_scan_ssids = wpa_s->max_sched_scan_ssids;
1113         if (max_sched_scan_ssids < 1 || wpa_s->conf->disable_scan_offload)
1114                 return -1;
1115
1116         if (wpa_s->sched_scanning) {
1117                 wpa_dbg(wpa_s, MSG_DEBUG, "Already sched scanning");
1118                 return 0;
1119         }
1120
1121         need_ssids = 0;
1122         for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
1123                 if (!wpas_network_disabled(wpa_s, ssid) && !ssid->scan_ssid) {
1124                         /* Use wildcard SSID to find this network */
1125                         wildcard = 1;
1126                 } else if (!wpas_network_disabled(wpa_s, ssid) &&
1127                            ssid->ssid_len)
1128                         need_ssids++;
1129
1130 #ifdef CONFIG_WPS
1131                 if (!wpas_network_disabled(wpa_s, ssid) &&
1132                     ssid->key_mgmt == WPA_KEY_MGMT_WPS) {
1133                         /*
1134                          * Normal scan is more reliable and faster for WPS
1135                          * operations and since these are for short periods of
1136                          * time, the benefit of trying to use sched_scan would
1137                          * be limited.
1138                          */
1139                         wpa_dbg(wpa_s, MSG_DEBUG, "Use normal scan instead of "
1140                                 "sched_scan for WPS");
1141                         return -1;
1142                 }
1143 #endif /* CONFIG_WPS */
1144         }
1145         if (wildcard)
1146                 need_ssids++;
1147
1148         if (wpa_s->normal_scans < 3 &&
1149             (need_ssids <= wpa_s->max_scan_ssids ||
1150              wpa_s->max_scan_ssids >= (int) max_sched_scan_ssids)) {
1151                 /*
1152                  * When normal scan can speed up operations, use that for the
1153                  * first operations before starting the sched_scan to allow
1154                  * user space sleep more. We do this only if the normal scan
1155                  * has functionality that is suitable for this or if the
1156                  * sched_scan does not have better support for multiple SSIDs.
1157                  */
1158                 wpa_dbg(wpa_s, MSG_DEBUG, "Use normal scan instead of "
1159                         "sched_scan for initial scans (normal_scans=%d)",
1160                         wpa_s->normal_scans);
1161                 return -1;
1162         }
1163
1164         os_memset(&params, 0, sizeof(params));
1165
1166         /* If we can't allocate space for the filters, we just don't filter */
1167         params.filter_ssids = os_calloc(wpa_s->max_match_sets,
1168                                         sizeof(struct wpa_driver_scan_filter));
1169
1170         prev_state = wpa_s->wpa_state;
1171         if (wpa_s->wpa_state == WPA_DISCONNECTED ||
1172             wpa_s->wpa_state == WPA_INACTIVE)
1173                 wpa_supplicant_set_state(wpa_s, WPA_SCANNING);
1174
1175         if (wpa_s->autoscan_params != NULL) {
1176                 scan_params = wpa_s->autoscan_params;
1177                 goto scan;
1178         }
1179
1180         /* Find the starting point from which to continue scanning */
1181         ssid = wpa_s->conf->ssid;
1182         if (wpa_s->prev_sched_ssid) {
1183                 while (ssid) {
1184                         if (ssid == wpa_s->prev_sched_ssid) {
1185                                 ssid = ssid->next;
1186                                 break;
1187                         }
1188                         ssid = ssid->next;
1189                 }
1190         }
1191
1192         if (!ssid || !wpa_s->prev_sched_ssid) {
1193                 wpa_dbg(wpa_s, MSG_DEBUG, "Beginning of SSID list");
1194                 if (wpa_s->conf->sched_scan_interval)
1195                         wpa_s->sched_scan_interval =
1196                                 wpa_s->conf->sched_scan_interval;
1197                 if (wpa_s->sched_scan_interval == 0)
1198                         wpa_s->sched_scan_interval = 10;
1199                 wpa_s->sched_scan_timeout = max_sched_scan_ssids * 2;
1200                 wpa_s->first_sched_scan = 1;
1201                 ssid = wpa_s->conf->ssid;
1202                 wpa_s->prev_sched_ssid = ssid;
1203         }
1204
1205         if (wildcard) {
1206                 wpa_dbg(wpa_s, MSG_DEBUG, "Add wildcard SSID to sched_scan");
1207                 params.num_ssids++;
1208         }
1209
1210         while (ssid) {
1211                 if (wpas_network_disabled(wpa_s, ssid))
1212                         goto next;
1213
1214                 if (params.num_filter_ssids < wpa_s->max_match_sets &&
1215                     params.filter_ssids && ssid->ssid && ssid->ssid_len) {
1216                         wpa_dbg(wpa_s, MSG_DEBUG, "add to filter ssid: %s",
1217                                 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
1218                         os_memcpy(params.filter_ssids[params.num_filter_ssids].ssid,
1219                                   ssid->ssid, ssid->ssid_len);
1220                         params.filter_ssids[params.num_filter_ssids].ssid_len =
1221                                 ssid->ssid_len;
1222                         params.num_filter_ssids++;
1223                 } else if (params.filter_ssids && ssid->ssid && ssid->ssid_len)
1224                 {
1225                         wpa_dbg(wpa_s, MSG_DEBUG, "Not enough room for SSID "
1226                                 "filter for sched_scan - drop filter");
1227                         os_free(params.filter_ssids);
1228                         params.filter_ssids = NULL;
1229                         params.num_filter_ssids = 0;
1230                 }
1231
1232                 if (ssid->scan_ssid && ssid->ssid && ssid->ssid_len) {
1233                         if (params.num_ssids == max_sched_scan_ssids)
1234                                 break; /* only room for broadcast SSID */
1235                         wpa_dbg(wpa_s, MSG_DEBUG,
1236                                 "add to active scan ssid: %s",
1237                                 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
1238                         params.ssids[params.num_ssids].ssid =
1239                                 ssid->ssid;
1240                         params.ssids[params.num_ssids].ssid_len =
1241                                 ssid->ssid_len;
1242                         params.num_ssids++;
1243                         if (params.num_ssids >= max_sched_scan_ssids) {
1244                                 wpa_s->prev_sched_ssid = ssid;
1245                                 do {
1246                                         ssid = ssid->next;
1247                                 } while (ssid &&
1248                                          (wpas_network_disabled(wpa_s, ssid) ||
1249                                           !ssid->scan_ssid));
1250                                 break;
1251                         }
1252                 }
1253
1254         next:
1255                 wpa_s->prev_sched_ssid = ssid;
1256                 ssid = ssid->next;
1257         }
1258
1259         if (params.num_filter_ssids == 0) {
1260                 os_free(params.filter_ssids);
1261                 params.filter_ssids = NULL;
1262         }
1263
1264         extra_ie = wpa_supplicant_extra_ies(wpa_s);
1265         if (extra_ie) {
1266                 params.extra_ies = wpabuf_head(extra_ie);
1267                 params.extra_ies_len = wpabuf_len(extra_ie);
1268         }
1269
1270         if (wpa_s->conf->filter_rssi)
1271                 params.filter_rssi = wpa_s->conf->filter_rssi;
1272
1273         /* See if user specified frequencies. If so, scan only those. */
1274         if (wpa_s->conf->freq_list && !params.freqs) {
1275                 wpa_dbg(wpa_s, MSG_DEBUG,
1276                         "Optimize scan based on conf->freq_list");
1277                 int_array_concat(&params.freqs, wpa_s->conf->freq_list);
1278         }
1279
1280         scan_params = &params;
1281
1282 scan:
1283         if (ssid || !wpa_s->first_sched_scan) {
1284                 wpa_dbg(wpa_s, MSG_DEBUG,
1285                         "Starting sched scan: interval %d timeout %d",
1286                         wpa_s->sched_scan_interval, wpa_s->sched_scan_timeout);
1287         } else {
1288                 wpa_dbg(wpa_s, MSG_DEBUG,
1289                         "Starting sched scan: interval %d (no timeout)",
1290                         wpa_s->sched_scan_interval);
1291         }
1292
1293         wpa_setband_scan_freqs(wpa_s, scan_params);
1294
1295         if (wpa_s->mac_addr_rand_enable & MAC_ADDR_RAND_SCHED_SCAN) {
1296                 params.mac_addr_rand = 1;
1297                 if (wpa_s->mac_addr_sched_scan) {
1298                         params.mac_addr = wpa_s->mac_addr_sched_scan;
1299                         params.mac_addr_mask = wpa_s->mac_addr_sched_scan +
1300                                 ETH_ALEN;
1301                 }
1302         }
1303
1304         ret = wpa_supplicant_start_sched_scan(wpa_s, scan_params,
1305                                               wpa_s->sched_scan_interval);
1306         wpabuf_free(extra_ie);
1307         os_free(params.filter_ssids);
1308         if (ret) {
1309                 wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate sched scan");
1310                 if (prev_state != wpa_s->wpa_state)
1311                         wpa_supplicant_set_state(wpa_s, prev_state);
1312                 return ret;
1313         }
1314
1315         /* If we have more SSIDs to scan, add a timeout so we scan them too */
1316         if (ssid || !wpa_s->first_sched_scan) {
1317                 wpa_s->sched_scan_timed_out = 0;
1318                 eloop_register_timeout(wpa_s->sched_scan_timeout, 0,
1319                                        wpa_supplicant_sched_scan_timeout,
1320                                        wpa_s, NULL);
1321                 wpa_s->first_sched_scan = 0;
1322                 wpa_s->sched_scan_timeout /= 2;
1323                 wpa_s->sched_scan_interval *= 2;
1324                 if (wpa_s->sched_scan_timeout < wpa_s->sched_scan_interval) {
1325                         wpa_s->sched_scan_interval = 10;
1326                         wpa_s->sched_scan_timeout = max_sched_scan_ssids * 2;
1327                 }
1328         }
1329
1330         /* If there is no more ssids, start next time from the beginning */
1331         if (!ssid)
1332                 wpa_s->prev_sched_ssid = NULL;
1333
1334         return 0;
1335 }
1336
1337
1338 /**
1339  * wpa_supplicant_cancel_scan - Cancel a scheduled scan request
1340  * @wpa_s: Pointer to wpa_supplicant data
1341  *
1342  * This function is used to cancel a scan request scheduled with
1343  * wpa_supplicant_req_scan().
1344  */
1345 void wpa_supplicant_cancel_scan(struct wpa_supplicant *wpa_s)
1346 {
1347         wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling scan request");
1348         eloop_cancel_timeout(wpa_supplicant_scan, wpa_s, NULL);
1349 }
1350
1351
1352 /**
1353  * wpa_supplicant_cancel_delayed_sched_scan - Stop a delayed scheduled scan
1354  * @wpa_s: Pointer to wpa_supplicant data
1355  *
1356  * This function is used to stop a delayed scheduled scan.
1357  */
1358 void wpa_supplicant_cancel_delayed_sched_scan(struct wpa_supplicant *wpa_s)
1359 {
1360         if (!wpa_s->sched_scan_supported)
1361                 return;
1362
1363         wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling delayed sched scan");
1364         eloop_cancel_timeout(wpa_supplicant_delayed_sched_scan_timeout,
1365                              wpa_s, NULL);
1366 }
1367
1368
1369 /**
1370  * wpa_supplicant_cancel_sched_scan - Stop running scheduled scans
1371  * @wpa_s: Pointer to wpa_supplicant data
1372  *
1373  * This function is used to stop a periodic scheduled scan.
1374  */
1375 void wpa_supplicant_cancel_sched_scan(struct wpa_supplicant *wpa_s)
1376 {
1377         if (!wpa_s->sched_scanning)
1378                 return;
1379
1380         wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling sched scan");
1381         eloop_cancel_timeout(wpa_supplicant_sched_scan_timeout, wpa_s, NULL);
1382         wpa_supplicant_stop_sched_scan(wpa_s);
1383 }
1384
1385
1386 /**
1387  * wpa_supplicant_notify_scanning - Indicate possible scan state change
1388  * @wpa_s: Pointer to wpa_supplicant data
1389  * @scanning: Whether scanning is currently in progress
1390  *
1391  * This function is to generate scanning notifycations. It is called whenever
1392  * there may have been a change in scanning (scan started, completed, stopped).
1393  * wpas_notify_scanning() is called whenever the scanning state changed from the
1394  * previously notified state.
1395  */
1396 void wpa_supplicant_notify_scanning(struct wpa_supplicant *wpa_s,
1397                                     int scanning)
1398 {
1399         if (wpa_s->scanning != scanning) {
1400                 wpa_s->scanning = scanning;
1401                 wpas_notify_scanning(wpa_s);
1402         }
1403 }
1404
1405
1406 static int wpa_scan_get_max_rate(const struct wpa_scan_res *res)
1407 {
1408         int rate = 0;
1409         const u8 *ie;
1410         int i;
1411
1412         ie = wpa_scan_get_ie(res, WLAN_EID_SUPP_RATES);
1413         for (i = 0; ie && i < ie[1]; i++) {
1414                 if ((ie[i + 2] & 0x7f) > rate)
1415                         rate = ie[i + 2] & 0x7f;
1416         }
1417
1418         ie = wpa_scan_get_ie(res, WLAN_EID_EXT_SUPP_RATES);
1419         for (i = 0; ie && i < ie[1]; i++) {
1420                 if ((ie[i + 2] & 0x7f) > rate)
1421                         rate = ie[i + 2] & 0x7f;
1422         }
1423
1424         return rate;
1425 }
1426
1427
1428 /**
1429  * wpa_scan_get_ie - Fetch a specified information element from a scan result
1430  * @res: Scan result entry
1431  * @ie: Information element identitifier (WLAN_EID_*)
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_ie(const struct wpa_scan_res *res, u8 ie)
1438 {
1439         const u8 *end, *pos;
1440
1441         pos = (const u8 *) (res + 1);
1442         end = pos + res->ie_len;
1443
1444         while (pos + 1 < end) {
1445                 if (pos + 2 + pos[1] > end)
1446                         break;
1447                 if (pos[0] == ie)
1448                         return pos;
1449                 pos += 2 + pos[1];
1450         }
1451
1452         return NULL;
1453 }
1454
1455
1456 /**
1457  * wpa_scan_get_vendor_ie - Fetch vendor information element from a scan result
1458  * @res: Scan result entry
1459  * @vendor_type: Vendor type (four octets starting the IE payload)
1460  * Returns: Pointer to the information element (id field) or %NULL if not found
1461  *
1462  * This function returns the first matching information element in the scan
1463  * result.
1464  */
1465 const u8 * wpa_scan_get_vendor_ie(const struct wpa_scan_res *res,
1466                                   u32 vendor_type)
1467 {
1468         const u8 *end, *pos;
1469
1470         pos = (const u8 *) (res + 1);
1471         end = pos + res->ie_len;
1472
1473         while (pos + 1 < end) {
1474                 if (pos + 2 + pos[1] > end)
1475                         break;
1476                 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1477                     vendor_type == WPA_GET_BE32(&pos[2]))
1478                         return pos;
1479                 pos += 2 + pos[1];
1480         }
1481
1482         return NULL;
1483 }
1484
1485
1486 /**
1487  * wpa_scan_get_vendor_ie_beacon - Fetch vendor information from a scan result
1488  * @res: Scan result entry
1489  * @vendor_type: Vendor type (four octets starting the IE payload)
1490  * Returns: Pointer to the information element (id field) or %NULL if not found
1491  *
1492  * This function returns the first matching information element in the scan
1493  * result.
1494  *
1495  * This function is like wpa_scan_get_vendor_ie(), but uses IE buffer only
1496  * from Beacon frames instead of either Beacon or Probe Response frames.
1497  */
1498 const u8 * wpa_scan_get_vendor_ie_beacon(const struct wpa_scan_res *res,
1499                                          u32 vendor_type)
1500 {
1501         const u8 *end, *pos;
1502
1503         if (res->beacon_ie_len == 0)
1504                 return NULL;
1505
1506         pos = (const u8 *) (res + 1);
1507         pos += res->ie_len;
1508         end = pos + res->beacon_ie_len;
1509
1510         while (pos + 1 < end) {
1511                 if (pos + 2 + pos[1] > end)
1512                         break;
1513                 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1514                     vendor_type == WPA_GET_BE32(&pos[2]))
1515                         return pos;
1516                 pos += 2 + pos[1];
1517         }
1518
1519         return NULL;
1520 }
1521
1522
1523 /**
1524  * wpa_scan_get_vendor_ie_multi - Fetch vendor IE data from a scan result
1525  * @res: Scan result entry
1526  * @vendor_type: Vendor type (four octets starting the IE payload)
1527  * Returns: Pointer to the information element payload or %NULL if not found
1528  *
1529  * This function returns concatenated payload of possibly fragmented vendor
1530  * specific information elements in the scan result. The caller is responsible
1531  * for freeing the returned buffer.
1532  */
1533 struct wpabuf * wpa_scan_get_vendor_ie_multi(const struct wpa_scan_res *res,
1534                                              u32 vendor_type)
1535 {
1536         struct wpabuf *buf;
1537         const u8 *end, *pos;
1538
1539         buf = wpabuf_alloc(res->ie_len);
1540         if (buf == NULL)
1541                 return NULL;
1542
1543         pos = (const u8 *) (res + 1);
1544         end = pos + res->ie_len;
1545
1546         while (pos + 1 < end) {
1547                 if (pos + 2 + pos[1] > end)
1548                         break;
1549                 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1550                     vendor_type == WPA_GET_BE32(&pos[2]))
1551                         wpabuf_put_data(buf, pos + 2 + 4, pos[1] - 4);
1552                 pos += 2 + pos[1];
1553         }
1554
1555         if (wpabuf_len(buf) == 0) {
1556                 wpabuf_free(buf);
1557                 buf = NULL;
1558         }
1559
1560         return buf;
1561 }
1562
1563
1564 /*
1565  * Channels with a great SNR can operate at full rate. What is a great SNR?
1566  * This doc https://supportforums.cisco.com/docs/DOC-12954 says, "the general
1567  * rule of thumb is that any SNR above 20 is good." This one
1568  * http://www.cisco.com/en/US/tech/tk722/tk809/technologies_q_and_a_item09186a00805e9a96.shtml#qa23
1569  * recommends 25 as a minimum SNR for 54 Mbps data rate. 30 is chosen here as a
1570  * conservative value.
1571  */
1572 #define GREAT_SNR 30
1573
1574 /* Compare function for sorting scan results. Return >0 if @b is considered
1575  * better. */
1576 static int wpa_scan_result_compar(const void *a, const void *b)
1577 {
1578 #define IS_5GHZ(n) (n > 4000)
1579 #define MIN(a,b) a < b ? a : b
1580         struct wpa_scan_res **_wa = (void *) a;
1581         struct wpa_scan_res **_wb = (void *) b;
1582         struct wpa_scan_res *wa = *_wa;
1583         struct wpa_scan_res *wb = *_wb;
1584         int wpa_a, wpa_b, maxrate_a, maxrate_b;
1585         int snr_a, snr_b;
1586
1587         /* WPA/WPA2 support preferred */
1588         wpa_a = wpa_scan_get_vendor_ie(wa, WPA_IE_VENDOR_TYPE) != NULL ||
1589                 wpa_scan_get_ie(wa, WLAN_EID_RSN) != NULL;
1590         wpa_b = wpa_scan_get_vendor_ie(wb, WPA_IE_VENDOR_TYPE) != NULL ||
1591                 wpa_scan_get_ie(wb, WLAN_EID_RSN) != NULL;
1592
1593         if (wpa_b && !wpa_a)
1594                 return 1;
1595         if (!wpa_b && wpa_a)
1596                 return -1;
1597
1598         /* privacy support preferred */
1599         if ((wa->caps & IEEE80211_CAP_PRIVACY) == 0 &&
1600             (wb->caps & IEEE80211_CAP_PRIVACY))
1601                 return 1;
1602         if ((wa->caps & IEEE80211_CAP_PRIVACY) &&
1603             (wb->caps & IEEE80211_CAP_PRIVACY) == 0)
1604                 return -1;
1605
1606         if ((wa->flags & wb->flags & WPA_SCAN_LEVEL_DBM) &&
1607             !((wa->flags | wb->flags) & WPA_SCAN_NOISE_INVALID)) {
1608                 snr_a = MIN(wa->level - wa->noise, GREAT_SNR);
1609                 snr_b = MIN(wb->level - wb->noise, GREAT_SNR);
1610         } else {
1611                 /* Not suitable information to calculate SNR, so use level */
1612                 snr_a = wa->level;
1613                 snr_b = wb->level;
1614         }
1615
1616         /* best/max rate preferred if SNR close enough */
1617         if ((snr_a && snr_b && abs(snr_b - snr_a) < 5) ||
1618             (wa->qual && wb->qual && abs(wb->qual - wa->qual) < 10)) {
1619                 maxrate_a = wpa_scan_get_max_rate(wa);
1620                 maxrate_b = wpa_scan_get_max_rate(wb);
1621                 if (maxrate_a != maxrate_b)
1622                         return maxrate_b - maxrate_a;
1623                 if (IS_5GHZ(wa->freq) ^ IS_5GHZ(wb->freq))
1624                         return IS_5GHZ(wa->freq) ? -1 : 1;
1625         }
1626
1627         /* use freq for channel preference */
1628
1629         /* all things being equal, use SNR; if SNRs are
1630          * identical, use quality values since some drivers may only report
1631          * that value and leave the signal level zero */
1632         if (snr_b == snr_a)
1633                 return wb->qual - wa->qual;
1634         return snr_b - snr_a;
1635 #undef MIN
1636 #undef IS_5GHZ
1637 }
1638
1639
1640 #ifdef CONFIG_WPS
1641 /* Compare function for sorting scan results when searching a WPS AP for
1642  * provisioning. Return >0 if @b is considered better. */
1643 static int wpa_scan_result_wps_compar(const void *a, const void *b)
1644 {
1645         struct wpa_scan_res **_wa = (void *) a;
1646         struct wpa_scan_res **_wb = (void *) b;
1647         struct wpa_scan_res *wa = *_wa;
1648         struct wpa_scan_res *wb = *_wb;
1649         int uses_wps_a, uses_wps_b;
1650         struct wpabuf *wps_a, *wps_b;
1651         int res;
1652
1653         /* Optimization - check WPS IE existence before allocated memory and
1654          * doing full reassembly. */
1655         uses_wps_a = wpa_scan_get_vendor_ie(wa, WPS_IE_VENDOR_TYPE) != NULL;
1656         uses_wps_b = wpa_scan_get_vendor_ie(wb, WPS_IE_VENDOR_TYPE) != NULL;
1657         if (uses_wps_a && !uses_wps_b)
1658                 return -1;
1659         if (!uses_wps_a && uses_wps_b)
1660                 return 1;
1661
1662         if (uses_wps_a && uses_wps_b) {
1663                 wps_a = wpa_scan_get_vendor_ie_multi(wa, WPS_IE_VENDOR_TYPE);
1664                 wps_b = wpa_scan_get_vendor_ie_multi(wb, WPS_IE_VENDOR_TYPE);
1665                 res = wps_ap_priority_compar(wps_a, wps_b);
1666                 wpabuf_free(wps_a);
1667                 wpabuf_free(wps_b);
1668                 if (res)
1669                         return res;
1670         }
1671
1672         /*
1673          * Do not use current AP security policy as a sorting criteria during
1674          * WPS provisioning step since the AP may get reconfigured at the
1675          * completion of provisioning.
1676          */
1677
1678         /* all things being equal, use signal level; if signal levels are
1679          * identical, use quality values since some drivers may only report
1680          * that value and leave the signal level zero */
1681         if (wb->level == wa->level)
1682                 return wb->qual - wa->qual;
1683         return wb->level - wa->level;
1684 }
1685 #endif /* CONFIG_WPS */
1686
1687
1688 static void dump_scan_res(struct wpa_scan_results *scan_res)
1689 {
1690 #ifndef CONFIG_NO_STDOUT_DEBUG
1691         size_t i;
1692
1693         if (scan_res->res == NULL || scan_res->num == 0)
1694                 return;
1695
1696         wpa_printf(MSG_EXCESSIVE, "Sorted scan results");
1697
1698         for (i = 0; i < scan_res->num; i++) {
1699                 struct wpa_scan_res *r = scan_res->res[i];
1700                 u8 *pos;
1701                 if ((r->flags & (WPA_SCAN_LEVEL_DBM | WPA_SCAN_NOISE_INVALID))
1702                     == WPA_SCAN_LEVEL_DBM) {
1703                         int snr = r->level - r->noise;
1704                         wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d "
1705                                    "noise=%d level=%d snr=%d%s flags=0x%x "
1706                                    "age=%u",
1707                                    MAC2STR(r->bssid), r->freq, r->qual,
1708                                    r->noise, r->level, snr,
1709                                    snr >= GREAT_SNR ? "*" : "", r->flags,
1710                                    r->age);
1711                 } else {
1712                         wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d "
1713                                    "noise=%d level=%d flags=0x%x age=%u",
1714                                    MAC2STR(r->bssid), r->freq, r->qual,
1715                                    r->noise, r->level, r->flags, r->age);
1716                 }
1717                 pos = (u8 *) (r + 1);
1718                 if (r->ie_len)
1719                         wpa_hexdump(MSG_EXCESSIVE, "IEs", pos, r->ie_len);
1720                 pos += r->ie_len;
1721                 if (r->beacon_ie_len)
1722                         wpa_hexdump(MSG_EXCESSIVE, "Beacon IEs",
1723                                     pos, r->beacon_ie_len);
1724         }
1725 #endif /* CONFIG_NO_STDOUT_DEBUG */
1726 }
1727
1728
1729 /**
1730  * wpa_supplicant_filter_bssid_match - Is the specified BSSID allowed
1731  * @wpa_s: Pointer to wpa_supplicant data
1732  * @bssid: BSSID to check
1733  * Returns: 0 if the BSSID is filtered or 1 if not
1734  *
1735  * This function is used to filter out specific BSSIDs from scan reslts mainly
1736  * for testing purposes (SET bssid_filter ctrl_iface command).
1737  */
1738 int wpa_supplicant_filter_bssid_match(struct wpa_supplicant *wpa_s,
1739                                       const u8 *bssid)
1740 {
1741         size_t i;
1742
1743         if (wpa_s->bssid_filter == NULL)
1744                 return 1;
1745
1746         for (i = 0; i < wpa_s->bssid_filter_count; i++) {
1747                 if (os_memcmp(wpa_s->bssid_filter + i * ETH_ALEN, bssid,
1748                               ETH_ALEN) == 0)
1749                         return 1;
1750         }
1751
1752         return 0;
1753 }
1754
1755
1756 static void filter_scan_res(struct wpa_supplicant *wpa_s,
1757                             struct wpa_scan_results *res)
1758 {
1759         size_t i, j;
1760
1761         if (wpa_s->bssid_filter == NULL)
1762                 return;
1763
1764         for (i = 0, j = 0; i < res->num; i++) {
1765                 if (wpa_supplicant_filter_bssid_match(wpa_s,
1766                                                       res->res[i]->bssid)) {
1767                         res->res[j++] = res->res[i];
1768                 } else {
1769                         os_free(res->res[i]);
1770                         res->res[i] = NULL;
1771                 }
1772         }
1773
1774         if (res->num != j) {
1775                 wpa_printf(MSG_DEBUG, "Filtered out %d scan results",
1776                            (int) (res->num - j));
1777                 res->num = j;
1778         }
1779 }
1780
1781
1782 /**
1783  * wpa_supplicant_get_scan_results - Get scan results
1784  * @wpa_s: Pointer to wpa_supplicant data
1785  * @info: Information about what was scanned or %NULL if not available
1786  * @new_scan: Whether a new scan was performed
1787  * Returns: Scan results, %NULL on failure
1788  *
1789  * This function request the current scan results from the driver and updates
1790  * the local BSS list wpa_s->bss. The caller is responsible for freeing the
1791  * results with wpa_scan_results_free().
1792  */
1793 struct wpa_scan_results *
1794 wpa_supplicant_get_scan_results(struct wpa_supplicant *wpa_s,
1795                                 struct scan_info *info, int new_scan)
1796 {
1797         struct wpa_scan_results *scan_res;
1798         size_t i;
1799         int (*compar)(const void *, const void *) = wpa_scan_result_compar;
1800
1801         scan_res = wpa_drv_get_scan_results2(wpa_s);
1802         if (scan_res == NULL) {
1803                 wpa_dbg(wpa_s, MSG_DEBUG, "Failed to get scan results");
1804                 return NULL;
1805         }
1806         if (scan_res->fetch_time.sec == 0) {
1807                 /*
1808                  * Make sure we have a valid timestamp if the driver wrapper
1809                  * does not set this.
1810                  */
1811                 os_get_reltime(&scan_res->fetch_time);
1812         }
1813         filter_scan_res(wpa_s, scan_res);
1814
1815 #ifdef CONFIG_WPS
1816         if (wpas_wps_searching(wpa_s)) {
1817                 wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Order scan results with WPS "
1818                         "provisioning rules");
1819                 compar = wpa_scan_result_wps_compar;
1820         }
1821 #endif /* CONFIG_WPS */
1822
1823         qsort(scan_res->res, scan_res->num, sizeof(struct wpa_scan_res *),
1824               compar);
1825         dump_scan_res(scan_res);
1826
1827         wpa_bss_update_start(wpa_s);
1828         for (i = 0; i < scan_res->num; i++)
1829                 wpa_bss_update_scan_res(wpa_s, scan_res->res[i],
1830                                         &scan_res->fetch_time);
1831         wpa_bss_update_end(wpa_s, info, new_scan);
1832
1833         return scan_res;
1834 }
1835
1836
1837 /**
1838  * wpa_supplicant_update_scan_results - Update scan results from the driver
1839  * @wpa_s: Pointer to wpa_supplicant data
1840  * Returns: 0 on success, -1 on failure
1841  *
1842  * This function updates the BSS table within wpa_supplicant based on the
1843  * currently available scan results from the driver without requesting a new
1844  * scan. This is used in cases where the driver indicates an association
1845  * (including roaming within ESS) and wpa_supplicant does not yet have the
1846  * needed information to complete the connection (e.g., to perform validation
1847  * steps in 4-way handshake).
1848  */
1849 int wpa_supplicant_update_scan_results(struct wpa_supplicant *wpa_s)
1850 {
1851         struct wpa_scan_results *scan_res;
1852         scan_res = wpa_supplicant_get_scan_results(wpa_s, NULL, 0);
1853         if (scan_res == NULL)
1854                 return -1;
1855         wpa_scan_results_free(scan_res);
1856
1857         return 0;
1858 }
1859
1860
1861 /**
1862  * scan_only_handler - Reports scan results
1863  */
1864 void scan_only_handler(struct wpa_supplicant *wpa_s,
1865                        struct wpa_scan_results *scan_res)
1866 {
1867         wpa_dbg(wpa_s, MSG_DEBUG, "Scan-only results received");
1868         if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
1869             wpa_s->manual_scan_use_id && wpa_s->own_scan_running) {
1870                 wpa_msg_ctrl(wpa_s, MSG_INFO, WPA_EVENT_SCAN_RESULTS "id=%u",
1871                              wpa_s->manual_scan_id);
1872                 wpa_s->manual_scan_use_id = 0;
1873         } else {
1874                 wpa_msg_ctrl(wpa_s, MSG_INFO, WPA_EVENT_SCAN_RESULTS);
1875         }
1876         wpas_notify_scan_results(wpa_s);
1877         wpas_notify_scan_done(wpa_s, 1);
1878         if (wpa_s->scan_work) {
1879                 struct wpa_radio_work *work = wpa_s->scan_work;
1880                 wpa_s->scan_work = NULL;
1881                 radio_work_done(work);
1882         }
1883 }
1884
1885
1886 int wpas_scan_scheduled(struct wpa_supplicant *wpa_s)
1887 {
1888         return eloop_is_timeout_registered(wpa_supplicant_scan, wpa_s, NULL);
1889 }
1890
1891
1892 struct wpa_driver_scan_params *
1893 wpa_scan_clone_params(const struct wpa_driver_scan_params *src)
1894 {
1895         struct wpa_driver_scan_params *params;
1896         size_t i;
1897         u8 *n;
1898
1899         params = os_zalloc(sizeof(*params));
1900         if (params == NULL)
1901                 return NULL;
1902
1903         for (i = 0; i < src->num_ssids; i++) {
1904                 if (src->ssids[i].ssid) {
1905                         n = os_malloc(src->ssids[i].ssid_len);
1906                         if (n == NULL)
1907                                 goto failed;
1908                         os_memcpy(n, src->ssids[i].ssid,
1909                                   src->ssids[i].ssid_len);
1910                         params->ssids[i].ssid = n;
1911                         params->ssids[i].ssid_len = src->ssids[i].ssid_len;
1912                 }
1913         }
1914         params->num_ssids = src->num_ssids;
1915
1916         if (src->extra_ies) {
1917                 n = os_malloc(src->extra_ies_len);
1918                 if (n == NULL)
1919                         goto failed;
1920                 os_memcpy(n, src->extra_ies, src->extra_ies_len);
1921                 params->extra_ies = n;
1922                 params->extra_ies_len = src->extra_ies_len;
1923         }
1924
1925         if (src->freqs) {
1926                 int len = int_array_len(src->freqs);
1927                 params->freqs = os_malloc((len + 1) * sizeof(int));
1928                 if (params->freqs == NULL)
1929                         goto failed;
1930                 os_memcpy(params->freqs, src->freqs, (len + 1) * sizeof(int));
1931         }
1932
1933         if (src->filter_ssids) {
1934                 params->filter_ssids = os_malloc(sizeof(*params->filter_ssids) *
1935                                                  src->num_filter_ssids);
1936                 if (params->filter_ssids == NULL)
1937                         goto failed;
1938                 os_memcpy(params->filter_ssids, src->filter_ssids,
1939                           sizeof(*params->filter_ssids) *
1940                           src->num_filter_ssids);
1941                 params->num_filter_ssids = src->num_filter_ssids;
1942         }
1943
1944         params->filter_rssi = src->filter_rssi;
1945         params->p2p_probe = src->p2p_probe;
1946         params->only_new_results = src->only_new_results;
1947         params->low_priority = src->low_priority;
1948
1949         if (src->mac_addr_rand) {
1950                 params->mac_addr_rand = src->mac_addr_rand;
1951
1952                 if (src->mac_addr && src->mac_addr_mask) {
1953                         u8 *mac_addr;
1954
1955                         mac_addr = os_malloc(2 * ETH_ALEN);
1956                         if (!mac_addr)
1957                                 goto failed;
1958
1959                         os_memcpy(mac_addr, src->mac_addr, ETH_ALEN);
1960                         os_memcpy(mac_addr + ETH_ALEN, src->mac_addr_mask,
1961                                   ETH_ALEN);
1962                         params->mac_addr = mac_addr;
1963                         params->mac_addr_mask = mac_addr + ETH_ALEN;
1964                 }
1965         }
1966         return params;
1967
1968 failed:
1969         wpa_scan_free_params(params);
1970         return NULL;
1971 }
1972
1973
1974 void wpa_scan_free_params(struct wpa_driver_scan_params *params)
1975 {
1976         size_t i;
1977
1978         if (params == NULL)
1979                 return;
1980
1981         for (i = 0; i < params->num_ssids; i++)
1982                 os_free((u8 *) params->ssids[i].ssid);
1983         os_free((u8 *) params->extra_ies);
1984         os_free(params->freqs);
1985         os_free(params->filter_ssids);
1986
1987         /*
1988          * Note: params->mac_addr_mask points to same memory allocation and
1989          * must not be freed separately.
1990          */
1991         os_free((u8 *) params->mac_addr);
1992
1993         os_free(params);
1994 }
1995
1996
1997 int wpas_start_pno(struct wpa_supplicant *wpa_s)
1998 {
1999         int ret, interval;
2000         size_t i, num_ssid, num_match_ssid;
2001         struct wpa_ssid *ssid;
2002         struct wpa_driver_scan_params params;
2003
2004         if (!wpa_s->sched_scan_supported)
2005                 return -1;
2006
2007         if (wpa_s->pno || wpa_s->pno_sched_pending)
2008                 return 0;
2009
2010         if ((wpa_s->wpa_state > WPA_SCANNING) &&
2011             (wpa_s->wpa_state <= WPA_COMPLETED)) {
2012                 wpa_printf(MSG_ERROR, "PNO: In assoc process");
2013                 return -EAGAIN;
2014         }
2015
2016         if (wpa_s->wpa_state == WPA_SCANNING) {
2017                 wpa_supplicant_cancel_scan(wpa_s);
2018                 if (wpa_s->sched_scanning) {
2019                         wpa_printf(MSG_DEBUG, "Schedule PNO on completion of "
2020                                    "ongoing sched scan");
2021                         wpa_supplicant_cancel_sched_scan(wpa_s);
2022                         wpa_s->pno_sched_pending = 1;
2023                         return 0;
2024                 }
2025         }
2026
2027         os_memset(&params, 0, sizeof(params));
2028
2029         num_ssid = num_match_ssid = 0;
2030         ssid = wpa_s->conf->ssid;
2031         while (ssid) {
2032                 if (!wpas_network_disabled(wpa_s, ssid)) {
2033                         num_match_ssid++;
2034                         if (ssid->scan_ssid)
2035                                 num_ssid++;
2036                 }
2037                 ssid = ssid->next;
2038         }
2039
2040         if (num_match_ssid == 0) {
2041                 wpa_printf(MSG_DEBUG, "PNO: No configured SSIDs");
2042                 return -1;
2043         }
2044
2045         if (num_match_ssid > num_ssid) {
2046                 params.num_ssids++; /* wildcard */
2047                 num_ssid++;
2048         }
2049
2050         if (num_ssid > WPAS_MAX_SCAN_SSIDS) {
2051                 wpa_printf(MSG_DEBUG, "PNO: Use only the first %u SSIDs from "
2052                            "%u", WPAS_MAX_SCAN_SSIDS, (unsigned int) num_ssid);
2053                 num_ssid = WPAS_MAX_SCAN_SSIDS;
2054         }
2055
2056         if (num_match_ssid > wpa_s->max_match_sets) {
2057                 num_match_ssid = wpa_s->max_match_sets;
2058                 wpa_dbg(wpa_s, MSG_DEBUG, "PNO: Too many SSIDs to match");
2059         }
2060         params.filter_ssids = os_calloc(num_match_ssid,
2061                                         sizeof(struct wpa_driver_scan_filter));
2062         if (params.filter_ssids == NULL)
2063                 return -1;
2064         i = 0;
2065         ssid = wpa_s->conf->ssid;
2066         while (ssid) {
2067                 if (!wpas_network_disabled(wpa_s, ssid)) {
2068                         if (ssid->scan_ssid && params.num_ssids < num_ssid) {
2069                                 params.ssids[params.num_ssids].ssid =
2070                                         ssid->ssid;
2071                                 params.ssids[params.num_ssids].ssid_len =
2072                                          ssid->ssid_len;
2073                                 params.num_ssids++;
2074                         }
2075                         os_memcpy(params.filter_ssids[i].ssid, ssid->ssid,
2076                                   ssid->ssid_len);
2077                         params.filter_ssids[i].ssid_len = ssid->ssid_len;
2078                         params.num_filter_ssids++;
2079                         i++;
2080                         if (i == num_match_ssid)
2081                                 break;
2082                 }
2083                 ssid = ssid->next;
2084         }
2085
2086         if (wpa_s->conf->filter_rssi)
2087                 params.filter_rssi = wpa_s->conf->filter_rssi;
2088
2089         interval = wpa_s->conf->sched_scan_interval ?
2090                 wpa_s->conf->sched_scan_interval : 10;
2091
2092         if (params.freqs == NULL && wpa_s->manual_sched_scan_freqs) {
2093                 wpa_dbg(wpa_s, MSG_DEBUG, "Limit sched scan to specified channels");
2094                 params.freqs = wpa_s->manual_sched_scan_freqs;
2095         }
2096
2097         if (wpa_s->mac_addr_rand_enable & MAC_ADDR_RAND_PNO) {
2098                 params.mac_addr_rand = 1;
2099                 if (wpa_s->mac_addr_pno) {
2100                         params.mac_addr = wpa_s->mac_addr_pno;
2101                         params.mac_addr_mask = wpa_s->mac_addr_pno + ETH_ALEN;
2102                 }
2103         }
2104
2105         ret = wpa_supplicant_start_sched_scan(wpa_s, &params, interval);
2106         os_free(params.filter_ssids);
2107         if (ret == 0)
2108                 wpa_s->pno = 1;
2109         else
2110                 wpa_msg(wpa_s, MSG_ERROR, "Failed to schedule PNO");
2111         return ret;
2112 }
2113
2114
2115 int wpas_stop_pno(struct wpa_supplicant *wpa_s)
2116 {
2117         int ret = 0;
2118
2119         if (!wpa_s->pno)
2120                 return 0;
2121
2122         ret = wpa_supplicant_stop_sched_scan(wpa_s);
2123
2124         wpa_s->pno = 0;
2125         wpa_s->pno_sched_pending = 0;
2126
2127         if (wpa_s->wpa_state == WPA_SCANNING)
2128                 wpa_supplicant_req_scan(wpa_s, 0, 0);
2129
2130         return ret;
2131 }
2132
2133
2134 void wpas_mac_addr_rand_scan_clear(struct wpa_supplicant *wpa_s,
2135                                     unsigned int type)
2136 {
2137         type &= MAC_ADDR_RAND_ALL;
2138         wpa_s->mac_addr_rand_enable &= ~type;
2139
2140         if (type & MAC_ADDR_RAND_SCAN) {
2141                 os_free(wpa_s->mac_addr_scan);
2142                 wpa_s->mac_addr_scan = NULL;
2143         }
2144
2145         if (type & MAC_ADDR_RAND_SCHED_SCAN) {
2146                 os_free(wpa_s->mac_addr_sched_scan);
2147                 wpa_s->mac_addr_sched_scan = NULL;
2148         }
2149
2150         if (type & MAC_ADDR_RAND_PNO) {
2151                 os_free(wpa_s->mac_addr_pno);
2152                 wpa_s->mac_addr_pno = NULL;
2153         }
2154 }
2155
2156
2157 int wpas_mac_addr_rand_scan_set(struct wpa_supplicant *wpa_s,
2158                                 unsigned int type, const u8 *addr,
2159                                 const u8 *mask)
2160 {
2161         u8 *tmp = NULL;
2162
2163         wpas_mac_addr_rand_scan_clear(wpa_s, type);
2164
2165         if (addr) {
2166                 tmp = os_malloc(2 * ETH_ALEN);
2167                 if (!tmp)
2168                         return -1;
2169                 os_memcpy(tmp, addr, ETH_ALEN);
2170                 os_memcpy(tmp + ETH_ALEN, mask, ETH_ALEN);
2171         }
2172
2173         if (type == MAC_ADDR_RAND_SCAN) {
2174                 wpa_s->mac_addr_scan = tmp;
2175         } else if (type == MAC_ADDR_RAND_SCHED_SCAN) {
2176                 wpa_s->mac_addr_sched_scan = tmp;
2177         } else if (type == MAC_ADDR_RAND_PNO) {
2178                 wpa_s->mac_addr_pno = tmp;
2179         } else {
2180                 wpa_printf(MSG_INFO,
2181                            "scan: Invalid MAC randomization type=0x%x",
2182                            type);
2183                 os_free(tmp);
2184                 return -1;
2185         }
2186
2187         wpa_s->mac_addr_rand_enable |= type;
2188         return 0;
2189 }