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
 100         if (wpa_s->p2p_mgmt)
 101                 return 0; /* no normal network profiles on p2p_mgmt interface */
 102
 103         while (ssid) {
 104                 if (!wpas_network_disabled(wpa_s, ssid))
 105                         count++;
 106                 else
 107                         disabled++;
 108                 ssid = ssid->next;
 109         }
 110         if (wpa_s->conf->cred && wpa_s->conf->interworking &&
 111             wpa_s->conf->auto_interworking)
 112                 count++;
 113         if (count == 0 && disabled > 0) {
 114                 wpa_dbg(wpa_s, MSG_DEBUG, "No enabled networks (%d disabled "
 115                         "networks)", disabled);
 116         }
 117         return count;
 118 }
 119
 120
 121 static void wpa_supplicant_assoc_try(struct wpa_supplicant *wpa_s,
 122                                      struct wpa_ssid *ssid)
 123 {
 124         while (ssid) {
 125                 if (!wpas_network_disabled(wpa_s, ssid))
 126                         break;
 127                 ssid = ssid->next;
 128         }
 129
 130         /* ap_scan=2 mode - try to associate with each SSID. */
 131         if (ssid == NULL) {
 132                 wpa_dbg(wpa_s, MSG_DEBUG, "wpa_supplicant_assoc_try: Reached "
 133                         "end of scan list - go back to beginning");
 134                 wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
 135                 wpa_supplicant_req_scan(wpa_s, 0, 0);
 136                 return;
 137         }
 138         if (ssid->next) {
 139                 /* Continue from the next SSID on the next attempt. */
 140                 wpa_s->prev_scan_ssid = ssid;
 141         } else {
 142                 /* Start from the beginning of the SSID list. */
 143                 wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
 144         }
 145         wpa_supplicant_associate(wpa_s, NULL, ssid);
 146 }
 147
 148
 149 static void wpas_trigger_scan_cb(struct wpa_radio_work *work, int deinit)
 150 {
 151         struct wpa_supplicant *wpa_s = work->wpa_s;
 152         struct wpa_driver_scan_params *params = work->ctx;
 153         int ret;
 154
 155         if (deinit) {
 156                 if (!work->started) {
 157                         wpa_scan_free_params(params);
 158                         return;
 159                 }
 160                 wpa_supplicant_notify_scanning(wpa_s, 0);
 161                 wpas_notify_scan_done(wpa_s, 0);
 162                 wpa_s->scan_work = NULL;
 163                 return;
 164         }
 165
 166         if (wpas_update_random_addr_disassoc(wpa_s) < 0) {
 167                 wpa_msg(wpa_s, MSG_INFO,
 168                         "Failed to assign random MAC address for a scan");
 169                 radio_work_done(work);
 170                 return;
 171         }
 172
 173         wpa_supplicant_notify_scanning(wpa_s, 1);
 174
 175         if (wpa_s->clear_driver_scan_cache) {
 176                 wpa_printf(MSG_DEBUG,
 177                            "Request driver to clear scan cache due to local BSS flush");
 178                 params->only_new_results = 1;
 179         }
 180         ret = wpa_drv_scan(wpa_s, params);
 181         wpa_scan_free_params(params);
 182         work->ctx = NULL;
 183         if (ret) {
 184                 int retry = wpa_s->last_scan_req != MANUAL_SCAN_REQ;
 185
 186                 if (wpa_s->disconnected)
 187                         retry = 0;
 188
 189                 wpa_supplicant_notify_scanning(wpa_s, 0);
 190                 wpas_notify_scan_done(wpa_s, 0);
 191                 if (wpa_s->wpa_state == WPA_SCANNING)
 192                         wpa_supplicant_set_state(wpa_s,
 193                                                  wpa_s->scan_prev_wpa_state);
 194                 wpa_msg(wpa_s, MSG_INFO, WPA_EVENT_SCAN_FAILED "ret=%d%s",
 195                         ret, retry ? " retry=1" : "");
 196                 radio_work_done(work);
 197
 198                 if (retry) {
 199                         /* Restore scan_req since we will try to scan again */
 200                         wpa_s->scan_req = wpa_s->last_scan_req;
 201                         wpa_supplicant_req_scan(wpa_s, 1, 0);
 202                 }
 203                 return;
 204         }
 205
 206         os_get_reltime(&wpa_s->scan_trigger_time);
 207         wpa_s->scan_runs++;
 208         wpa_s->normal_scans++;
 209         wpa_s->own_scan_requested = 1;
 210         wpa_s->clear_driver_scan_cache = 0;
 211         wpa_s->scan_work = work;
 212 }
 213
 214
 215 /**
 216  * wpa_supplicant_trigger_scan - Request driver to start a scan
 217  * @wpa_s: Pointer to wpa_supplicant data
 218  * @params: Scan parameters
 219  * Returns: 0 on success, -1 on failure
 220  */
 221 int wpa_supplicant_trigger_scan(struct wpa_supplicant *wpa_s,
 222                                 struct wpa_driver_scan_params *params)
 223 {
 224         struct wpa_driver_scan_params *ctx;
 225
 226         if (wpa_s->scan_work) {
 227                 wpa_dbg(wpa_s, MSG_INFO, "Reject scan trigger since one is already pending");
 228                 return -1;
 229         }
 230
 231         ctx = wpa_scan_clone_params(params);
 232         if (ctx == NULL)
 233                 return -1;
 234
 235         if (radio_add_work(wpa_s, 0, "scan", 0, wpas_trigger_scan_cb, ctx) < 0)
 236         {
 237                 wpa_scan_free_params(ctx);
 238                 return -1;
 239         }
 240
 241         return 0;
 242 }
 243
 244
 245 static void
 246 wpa_supplicant_delayed_sched_scan_timeout(void *eloop_ctx, void *timeout_ctx)
 247 {
 248         struct wpa_supplicant *wpa_s = eloop_ctx;
 249
 250         wpa_dbg(wpa_s, MSG_DEBUG, "Starting delayed sched scan");
 251
 252         if (wpa_supplicant_req_sched_scan(wpa_s))
 253                 wpa_supplicant_req_scan(wpa_s, 0, 0);
 254 }
 255
 256
 257 static void
 258 wpa_supplicant_sched_scan_timeout(void *eloop_ctx, void *timeout_ctx)
 259 {
 260         struct wpa_supplicant *wpa_s = eloop_ctx;
 261
 262         wpa_dbg(wpa_s, MSG_DEBUG, "Sched scan timeout - stopping it");
 263
 264         wpa_s->sched_scan_timed_out = 1;
 265         wpa_supplicant_cancel_sched_scan(wpa_s);
 266 }
 267
 268
 269 int wpa_supplicant_start_sched_scan(struct wpa_supplicant *wpa_s,
 270                                     struct wpa_driver_scan_params *params)
 271 {
 272         int ret;
 273
 274         wpa_supplicant_notify_scanning(wpa_s, 1);
 275         ret = wpa_drv_sched_scan(wpa_s, params);
 276         if (ret)
 277                 wpa_supplicant_notify_scanning(wpa_s, 0);
 278         else
 279                 wpa_s->sched_scanning = 1;
 280
 281         return ret;
 282 }
 283
 284
 285 int wpa_supplicant_stop_sched_scan(struct wpa_supplicant *wpa_s)
 286 {
 287         int ret;
 288
 289         ret = wpa_drv_stop_sched_scan(wpa_s);
 290         if (ret) {
 291                 wpa_dbg(wpa_s, MSG_DEBUG, "stopping sched_scan failed!");
 292                 /* TODO: what to do if stopping fails? */
 293                 return -1;
 294         }
 295
 296         return ret;
 297 }
 298
 299
 300 static struct wpa_driver_scan_filter *
 301 wpa_supplicant_build_filter_ssids(struct wpa_config *conf, size_t *num_ssids)
 302 {
 303         struct wpa_driver_scan_filter *ssids;
 304         struct wpa_ssid *ssid;
 305         size_t count;
 306
 307         *num_ssids = 0;
 308         if (!conf->filter_ssids)
 309                 return NULL;
 310
 311         for (count = 0, ssid = conf->ssid; ssid; ssid = ssid->next) {
 312                 if (ssid->ssid && ssid->ssid_len)
 313                         count++;
 314         }
 315         if (count == 0)
 316                 return NULL;
 317         ssids = os_calloc(count, sizeof(struct wpa_driver_scan_filter));
 318         if (ssids == NULL)
 319                 return NULL;
 320
 321         for (ssid = conf->ssid; ssid; ssid = ssid->next) {
 322                 if (!ssid->ssid || !ssid->ssid_len)
 323                         continue;
 324                 os_memcpy(ssids[*num_ssids].ssid, ssid->ssid, ssid->ssid_len);
 325                 ssids[*num_ssids].ssid_len = ssid->ssid_len;
 326                 (*num_ssids)++;
 327         }
 328
 329         return ssids;
 330 }
 331
 332
 333 static void wpa_supplicant_optimize_freqs(
 334         struct wpa_supplicant *wpa_s, struct wpa_driver_scan_params *params)
 335 {
 336 #ifdef CONFIG_P2P
 337         if (params->freqs == NULL && wpa_s->p2p_in_provisioning &&
 338             wpa_s->go_params) {
 339                 /* Optimize provisioning state scan based on GO information */
 340                 if (wpa_s->p2p_in_provisioning < 5 &&
 341                     wpa_s->go_params->freq > 0) {
 342                         wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only GO "
 343                                 "preferred frequency %d MHz",
 344                                 wpa_s->go_params->freq);
 345                         params->freqs = os_calloc(2, sizeof(int));
 346                         if (params->freqs)
 347                                 params->freqs[0] = wpa_s->go_params->freq;
 348                 } else if (wpa_s->p2p_in_provisioning < 8 &&
 349                            wpa_s->go_params->freq_list[0]) {
 350                         wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only common "
 351                                 "channels");
 352                         int_array_concat(&params->freqs,
 353                                          wpa_s->go_params->freq_list);
 354                         if (params->freqs)
 355                                 int_array_sort_unique(params->freqs);
 356                 }
 357                 wpa_s->p2p_in_provisioning++;
 358         }
 359
 360         if (params->freqs == NULL && wpa_s->p2p_in_invitation) {
 361                 /*
 362                  * Optimize scan based on GO information during persistent
 363                  * group reinvocation
 364                  */
 365                 if (wpa_s->p2p_in_invitation < 5 &&
 366                     wpa_s->p2p_invite_go_freq > 0) {
 367                         wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only GO preferred frequency %d MHz during invitation",
 368                                 wpa_s->p2p_invite_go_freq);
 369                         params->freqs = os_calloc(2, sizeof(int));
 370                         if (params->freqs)
 371                                 params->freqs[0] = wpa_s->p2p_invite_go_freq;
 372                 }
 373                 wpa_s->p2p_in_invitation++;
 374                 if (wpa_s->p2p_in_invitation > 20) {
 375                         /*
 376                          * This should not really happen since the variable is
 377                          * cleared on group removal, but if it does happen, make
 378                          * sure we do not get stuck in special invitation scan
 379                          * mode.
 380                          */
 381                         wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Clear p2p_in_invitation");
 382                         wpa_s->p2p_in_invitation = 0;
 383                 }
 384         }
 385 #endif /* CONFIG_P2P */
 386
 387 #ifdef CONFIG_WPS
 388         if (params->freqs == NULL && wpa_s->after_wps && wpa_s->wps_freq) {
 389                 /*
 390                  * Optimize post-provisioning scan based on channel used
 391                  * during provisioning.
 392                  */
 393                 wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Scan only frequency %u MHz "
 394                         "that was used during provisioning", wpa_s->wps_freq);
 395                 params->freqs = os_calloc(2, sizeof(int));
 396                 if (params->freqs)
 397                         params->freqs[0] = wpa_s->wps_freq;
 398                 wpa_s->after_wps--;
 399         } else if (wpa_s->after_wps)
 400                 wpa_s->after_wps--;
 401
 402         if (params->freqs == NULL && wpa_s->known_wps_freq && wpa_s->wps_freq)
 403         {
 404                 /* Optimize provisioning scan based on already known channel */
 405                 wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Scan only frequency %u MHz",
 406                         wpa_s->wps_freq);
 407                 params->freqs = os_calloc(2, sizeof(int));
 408                 if (params->freqs)
 409                         params->freqs[0] = wpa_s->wps_freq;
 410                 wpa_s->known_wps_freq = 0; /* only do this once */
 411         }
 412 #endif /* CONFIG_WPS */
 413 }
 414
 415
 416 #ifdef CONFIG_INTERWORKING
 417 static void wpas_add_interworking_elements(struct wpa_supplicant *wpa_s,
 418                                            struct wpabuf *buf)
 419 {
 420         wpabuf_put_u8(buf, WLAN_EID_INTERWORKING);
 421         wpabuf_put_u8(buf, is_zero_ether_addr(wpa_s->conf->hessid) ? 1 :
 422                       1 + ETH_ALEN);
 423         wpabuf_put_u8(buf, wpa_s->conf->access_network_type);
 424         /* No Venue Info */
 425         if (!is_zero_ether_addr(wpa_s->conf->hessid))
 426                 wpabuf_put_data(buf, wpa_s->conf->hessid, ETH_ALEN);
 427 }
 428 #endif /* CONFIG_INTERWORKING */
 429
 430
 431 static struct wpabuf * wpa_supplicant_extra_ies(struct wpa_supplicant *wpa_s)
 432 {
 433         struct wpabuf *extra_ie = NULL;
 434         u8 ext_capab[18];
 435         int ext_capab_len;
 436 #ifdef CONFIG_WPS
 437         int wps = 0;
 438         enum wps_request_type req_type = WPS_REQ_ENROLLEE_INFO;
 439 #endif /* CONFIG_WPS */
 440
 441         ext_capab_len = wpas_build_ext_capab(wpa_s, ext_capab,
 442                                              sizeof(ext_capab));
 443         if (ext_capab_len > 0 &&
 444             wpabuf_resize(&extra_ie, ext_capab_len) == 0)
 445                 wpabuf_put_data(extra_ie, ext_capab, ext_capab_len);
 446
 447 #ifdef CONFIG_INTERWORKING
 448         if (wpa_s->conf->interworking &&
 449             wpabuf_resize(&extra_ie, 100) == 0)
 450                 wpas_add_interworking_elements(wpa_s, extra_ie);
 451 #endif /* CONFIG_INTERWORKING */
 452
 453 #ifdef CONFIG_WPS
 454         wps = wpas_wps_in_use(wpa_s, &req_type);
 455
 456         if (wps) {
 457                 struct wpabuf *wps_ie;
 458                 wps_ie = wps_build_probe_req_ie(wps == 2 ? DEV_PW_PUSHBUTTON :
 459                                                 DEV_PW_DEFAULT,
 460                                                 &wpa_s->wps->dev,
 461                                                 wpa_s->wps->uuid, req_type,
 462                                                 0, NULL);
 463                 if (wps_ie) {
 464                         if (wpabuf_resize(&extra_ie, wpabuf_len(wps_ie)) == 0)
 465                                 wpabuf_put_buf(extra_ie, wps_ie);
 466                         wpabuf_free(wps_ie);
 467                 }
 468         }
 469
 470 #ifdef CONFIG_P2P
 471         if (wps) {
 472                 size_t ielen = p2p_scan_ie_buf_len(wpa_s->global->p2p);
 473                 if (wpabuf_resize(&extra_ie, ielen) == 0)
 474                         wpas_p2p_scan_ie(wpa_s, extra_ie);
 475         }
 476 #endif /* CONFIG_P2P */
 477
 478         wpa_supplicant_mesh_add_scan_ie(wpa_s, &extra_ie);
 479
 480 #endif /* CONFIG_WPS */
 481
 482 #ifdef CONFIG_HS20
 483         if (wpa_s->conf->hs20 && wpabuf_resize(&extra_ie, 7) == 0)
 484                 wpas_hs20_add_indication(extra_ie, -1);
 485 #endif /* CONFIG_HS20 */
 486
 487 #ifdef CONFIG_FST
 488         if (wpa_s->fst_ies &&
 489             wpabuf_resize(&extra_ie, wpabuf_len(wpa_s->fst_ies)) == 0)
 490                 wpabuf_put_buf(extra_ie, wpa_s->fst_ies);
 491 #endif /* CONFIG_FST */
 492
 493 #ifdef CONFIG_MBO
 494         /* Send cellular capabilities for potential MBO STAs */
 495         if (wpabuf_resize(&extra_ie, 9) == 0)
 496                 wpas_mbo_scan_ie(wpa_s, extra_ie);
 497 #endif /* CONFIG_MBO */
 498
 499         return extra_ie;
 500 }
 501
 502
 503 #ifdef CONFIG_P2P
 504
 505 /*
 506  * Check whether there are any enabled networks or credentials that could be
 507  * used for a non-P2P connection.
 508  */
 509 static int non_p2p_network_enabled(struct wpa_supplicant *wpa_s)
 510 {
 511         struct wpa_ssid *ssid;
 512
 513         for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
 514                 if (wpas_network_disabled(wpa_s, ssid))
 515                         continue;
 516                 if (!ssid->p2p_group)
 517                         return 1;
 518         }
 519
 520         if (wpa_s->conf->cred && wpa_s->conf->interworking &&
 521             wpa_s->conf->auto_interworking)
 522                 return 1;
 523
 524         return 0;
 525 }
 526
 527 #endif /* CONFIG_P2P */
 528
 529
 530 static void wpa_setband_scan_freqs_list(struct wpa_supplicant *wpa_s,
 531                                         enum hostapd_hw_mode band,
 532                                         struct wpa_driver_scan_params *params)
 533 {
 534         /* Include only supported channels for the specified band */
 535         struct hostapd_hw_modes *mode;
 536         int count, i;
 537
 538         mode = get_mode(wpa_s->hw.modes, wpa_s->hw.num_modes, band);
 539         if (mode == NULL) {
 540                 /* No channels supported in this band - use empty list */
 541                 params->freqs = os_zalloc(sizeof(int));
 542                 return;
 543         }
 544
 545         params->freqs = os_calloc(mode->num_channels + 1, sizeof(int));
 546         if (params->freqs == NULL)
 547                 return;
 548         for (count = 0, i = 0; i < mode->num_channels; i++) {
 549                 if (mode->channels[i].flag & HOSTAPD_CHAN_DISABLED)
 550                         continue;
 551                 params->freqs[count++] = mode->channels[i].freq;
 552         }
 553 }
 554
 555
 556 static void wpa_setband_scan_freqs(struct wpa_supplicant *wpa_s,
 557                                    struct wpa_driver_scan_params *params)
 558 {
 559         if (wpa_s->hw.modes == NULL)
 560                 return; /* unknown what channels the driver supports */
 561         if (params->freqs)
 562                 return; /* already using a limited channel set */
 563         if (wpa_s->setband == WPA_SETBAND_5G)
 564                 wpa_setband_scan_freqs_list(wpa_s, HOSTAPD_MODE_IEEE80211A,
 565                                             params);
 566         else if (wpa_s->setband == WPA_SETBAND_2G)
 567                 wpa_setband_scan_freqs_list(wpa_s, HOSTAPD_MODE_IEEE80211G,
 568                                             params);
 569 }
 570
 571
 572 static void wpa_set_scan_ssids(struct wpa_supplicant *wpa_s,
 573                                struct wpa_driver_scan_params *params,
 574                                size_t max_ssids)
 575 {
 576         unsigned int i;
 577         struct wpa_ssid *ssid;
 578
 579         for (i = 0; i < wpa_s->scan_id_count; i++) {
 580                 unsigned int j;
 581
 582                 ssid = wpa_config_get_network(wpa_s->conf, wpa_s->scan_id[i]);
 583                 if (!ssid || !ssid->scan_ssid)
 584                         continue;
 585
 586                 for (j = 0; j < params->num_ssids; j++) {
 587                         if (params->ssids[j].ssid_len == ssid->ssid_len &&
 588                             params->ssids[j].ssid &&
 589                             os_memcmp(params->ssids[j].ssid, ssid->ssid,
 590                                       ssid->ssid_len) == 0)
 591                                 break;
 592                 }
 593                 if (j < params->num_ssids)
 594                         continue; /* already in the list */
 595
 596                 if (params->num_ssids + 1 > max_ssids) {
 597                         wpa_printf(MSG_DEBUG,
 598                                    "Over max scan SSIDs for manual request");
 599                         break;
 600                 }
 601
 602                 wpa_printf(MSG_DEBUG, "Scan SSID (manual request): %s",
 603                            wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
 604                 params->ssids[params->num_ssids].ssid = ssid->ssid;
 605                 params->ssids[params->num_ssids].ssid_len = ssid->ssid_len;
 606                 params->num_ssids++;
 607         }
 608
 609         wpa_s->scan_id_count = 0;
 610 }
 611
 612
 613 static int wpa_set_ssids_from_scan_req(struct wpa_supplicant *wpa_s,
 614                                        struct wpa_driver_scan_params *params,
 615                                        size_t max_ssids)
 616 {
 617         unsigned int i;
 618
 619         if (wpa_s->ssids_from_scan_req == NULL ||
 620             wpa_s->num_ssids_from_scan_req == 0)
 621                 return 0;
 622
 623         if (wpa_s->num_ssids_from_scan_req > max_ssids) {
 624                 wpa_s->num_ssids_from_scan_req = max_ssids;
 625                 wpa_printf(MSG_DEBUG, "Over max scan SSIDs from scan req: %u",
 626                            (unsigned int) max_ssids);
 627         }
 628
 629         for (i = 0; i < wpa_s->num_ssids_from_scan_req; i++) {
 630                 params->ssids[i].ssid = wpa_s->ssids_from_scan_req[i].ssid;
 631                 params->ssids[i].ssid_len =
 632                         wpa_s->ssids_from_scan_req[i].ssid_len;
 633                 wpa_hexdump_ascii(MSG_DEBUG, "specific SSID",
 634                                   params->ssids[i].ssid,
 635                                   params->ssids[i].ssid_len);
 636         }
 637
 638         params->num_ssids = wpa_s->num_ssids_from_scan_req;
 639         wpa_s->num_ssids_from_scan_req = 0;
 640         return 1;
 641 }
 642
 643
 644 static void wpa_supplicant_scan(void *eloop_ctx, void *timeout_ctx)
 645 {
 646         struct wpa_supplicant *wpa_s = eloop_ctx;
 647         struct wpa_ssid *ssid;
 648         int ret, p2p_in_prog;
 649         struct wpabuf *extra_ie = NULL;
 650         struct wpa_driver_scan_params params;
 651         struct wpa_driver_scan_params *scan_params;
 652         size_t max_ssids;
 653         int connect_without_scan = 0;
 654
 655         if (wpa_s->pno || wpa_s->pno_sched_pending) {
 656                 wpa_dbg(wpa_s, MSG_DEBUG, "Skip scan - PNO is in progress");
 657                 return;
 658         }
 659
 660         if (wpa_s->wpa_state == WPA_INTERFACE_DISABLED) {
 661                 wpa_dbg(wpa_s, MSG_DEBUG, "Skip scan - interface disabled");
 662                 return;
 663         }
 664
 665         if (wpa_s->disconnected && wpa_s->scan_req == NORMAL_SCAN_REQ) {
 666                 wpa_dbg(wpa_s, MSG_DEBUG, "Disconnected - do not scan");
 667                 wpa_supplicant_set_state(wpa_s, WPA_DISCONNECTED);
 668                 return;
 669         }
 670
 671         if (wpa_s->scanning) {
 672                 /*
 673                  * If we are already in scanning state, we shall reschedule the
 674                  * the incoming scan request.
 675                  */
 676                 wpa_dbg(wpa_s, MSG_DEBUG, "Already scanning - Reschedule the incoming scan req");
 677                 wpa_supplicant_req_scan(wpa_s, 1, 0);
 678                 return;
 679         }
 680
 681         if (!wpa_supplicant_enabled_networks(wpa_s) &&
 682             wpa_s->scan_req == NORMAL_SCAN_REQ) {
 683                 wpa_dbg(wpa_s, MSG_DEBUG, "No enabled networks - do not scan");
 684                 wpa_supplicant_set_state(wpa_s, WPA_INACTIVE);
 685                 return;
 686         }
 687
 688         if (wpa_s->conf->ap_scan != 0 &&
 689             (wpa_s->drv_flags & WPA_DRIVER_FLAGS_WIRED)) {
 690                 wpa_dbg(wpa_s, MSG_DEBUG, "Using wired authentication - "
 691                         "overriding ap_scan configuration");
 692                 wpa_s->conf->ap_scan = 0;
 693                 wpas_notify_ap_scan_changed(wpa_s);
 694         }
 695
 696         if (wpa_s->conf->ap_scan == 0) {
 697                 wpa_supplicant_gen_assoc_event(wpa_s);
 698                 return;
 699         }
 700
 701         ssid = NULL;
 702         if (wpa_s->scan_req != MANUAL_SCAN_REQ &&
 703             wpa_s->connect_without_scan) {
 704                 connect_without_scan = 1;
 705                 for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
 706                         if (ssid == wpa_s->connect_without_scan)
 707                                 break;
 708                 }
 709         }
 710
 711         p2p_in_prog = wpas_p2p_in_progress(wpa_s);
 712         if (p2p_in_prog && p2p_in_prog != 2 &&
 713             (!ssid ||
 714              (ssid->mode != WPAS_MODE_AP && ssid->mode != WPAS_MODE_P2P_GO))) {
 715                 wpa_dbg(wpa_s, MSG_DEBUG, "Delay station mode scan while P2P operation is in progress");
 716                 wpa_supplicant_req_scan(wpa_s, 5, 0);
 717                 return;
 718         }
 719
 720         if (wpa_s->conf->ap_scan == 2)
 721                 max_ssids = 1;
 722         else {
 723                 max_ssids = wpa_s->max_scan_ssids;
 724                 if (max_ssids > WPAS_MAX_SCAN_SSIDS)
 725                         max_ssids = WPAS_MAX_SCAN_SSIDS;
 726         }
 727
 728         wpa_s->last_scan_req = wpa_s->scan_req;
 729         wpa_s->scan_req = NORMAL_SCAN_REQ;
 730
 731         if (connect_without_scan) {
 732                 wpa_s->connect_without_scan = NULL;
 733                 if (ssid) {
 734                         wpa_printf(MSG_DEBUG, "Start a pre-selected network "
 735                                    "without scan step");
 736                         wpa_supplicant_associate(wpa_s, NULL, ssid);
 737                         return;
 738                 }
 739         }
 740
 741         os_memset(&params, 0, sizeof(params));
 742
 743         wpa_s->scan_prev_wpa_state = wpa_s->wpa_state;
 744         if (wpa_s->wpa_state == WPA_DISCONNECTED ||
 745             wpa_s->wpa_state == WPA_INACTIVE)
 746                 wpa_supplicant_set_state(wpa_s, WPA_SCANNING);
 747
 748         /*
 749          * If autoscan has set its own scanning parameters
 750          */
 751         if (wpa_s->autoscan_params != NULL) {
 752                 scan_params = wpa_s->autoscan_params;
 753                 goto scan;
 754         }
 755
 756         if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
 757             wpa_set_ssids_from_scan_req(wpa_s, &params, max_ssids)) {
 758                 wpa_printf(MSG_DEBUG, "Use specific SSIDs from SCAN command");
 759                 goto ssid_list_set;
 760         }
 761
 762 #ifdef CONFIG_P2P
 763         if ((wpa_s->p2p_in_provisioning || wpa_s->show_group_started) &&
 764             wpa_s->go_params && !wpa_s->conf->passive_scan) {
 765                 wpa_printf(MSG_DEBUG, "P2P: Use specific SSID for scan during P2P group formation (p2p_in_provisioning=%d show_group_started=%d)",
 766                            wpa_s->p2p_in_provisioning,
 767                            wpa_s->show_group_started);
 768                 params.ssids[0].ssid = wpa_s->go_params->ssid;
 769                 params.ssids[0].ssid_len = wpa_s->go_params->ssid_len;
 770                 params.num_ssids = 1;
 771                 goto ssid_list_set;
 772         }
 773
 774         if (wpa_s->p2p_in_invitation) {
 775                 if (wpa_s->current_ssid) {
 776                         wpa_printf(MSG_DEBUG, "P2P: Use specific SSID for scan during invitation");
 777                         params.ssids[0].ssid = wpa_s->current_ssid->ssid;
 778                         params.ssids[0].ssid_len =
 779                                 wpa_s->current_ssid->ssid_len;
 780                         params.num_ssids = 1;
 781                 } else {
 782                         wpa_printf(MSG_DEBUG, "P2P: No specific SSID known for scan during invitation");
 783                 }
 784                 goto ssid_list_set;
 785         }
 786 #endif /* CONFIG_P2P */
 787
 788         /* Find the starting point from which to continue scanning */
 789         ssid = wpa_s->conf->ssid;
 790         if (wpa_s->prev_scan_ssid != WILDCARD_SSID_SCAN) {
 791                 while (ssid) {
 792                         if (ssid == wpa_s->prev_scan_ssid) {
 793                                 ssid = ssid->next;
 794                                 break;
 795                         }
 796                         ssid = ssid->next;
 797                 }
 798         }
 799
 800         if (wpa_s->last_scan_req != MANUAL_SCAN_REQ &&
 801 #ifdef CONFIG_AP
 802             !wpa_s->ap_iface &&
 803 #endif /* CONFIG_AP */
 804             wpa_s->conf->ap_scan == 2) {
 805                 wpa_s->connect_without_scan = NULL;
 806                 wpa_s->prev_scan_wildcard = 0;
 807                 wpa_supplicant_assoc_try(wpa_s, ssid);
 808                 return;
 809         } else if (wpa_s->conf->ap_scan == 2) {
 810                 /*
 811                  * User-initiated scan request in ap_scan == 2; scan with
 812                  * wildcard SSID.
 813                  */
 814                 ssid = NULL;
 815         } else if (wpa_s->reattach && wpa_s->current_ssid != NULL) {
 816                 /*
 817                  * Perform single-channel single-SSID scan for
 818                  * reassociate-to-same-BSS operation.
 819                  */
 820                 /* Setup SSID */
 821                 ssid = wpa_s->current_ssid;
 822                 wpa_hexdump_ascii(MSG_DEBUG, "Scan SSID",
 823                                   ssid->ssid, ssid->ssid_len);
 824                 params.ssids[0].ssid = ssid->ssid;
 825                 params.ssids[0].ssid_len = ssid->ssid_len;
 826                 params.num_ssids = 1;
 827
 828                 /*
 829                  * Allocate memory for frequency array, allocate one extra
 830                  * slot for the zero-terminator.
 831                  */
 832                 params.freqs = os_malloc(sizeof(int) * 2);
 833                 if (params.freqs == NULL) {
 834                         wpa_dbg(wpa_s, MSG_ERROR, "Memory allocation failed");
 835                         return;
 836                 }
 837                 params.freqs[0] = wpa_s->assoc_freq;
 838                 params.freqs[1] = 0;
 839
 840                 /*
 841                  * Reset the reattach flag so that we fall back to full scan if
 842                  * this scan fails.
 843                  */
 844                 wpa_s->reattach = 0;
 845         } else {
 846                 struct wpa_ssid *start = ssid, *tssid;
 847                 int freqs_set = 0;
 848                 if (ssid == NULL && max_ssids > 1)
 849                         ssid = wpa_s->conf->ssid;
 850                 while (ssid) {
 851                         if (!wpas_network_disabled(wpa_s, ssid) &&
 852                             ssid->scan_ssid) {
 853                                 wpa_hexdump_ascii(MSG_DEBUG, "Scan SSID",
 854                                                   ssid->ssid, ssid->ssid_len);
 855                                 params.ssids[params.num_ssids].ssid =
 856                                         ssid->ssid;
 857                                 params.ssids[params.num_ssids].ssid_len =
 858                                         ssid->ssid_len;
 859                                 params.num_ssids++;
 860                                 if (params.num_ssids + 1 >= max_ssids)
 861                                         break;
 862                         }
 863                         ssid = ssid->next;
 864                         if (ssid == start)
 865                                 break;
 866                         if (ssid == NULL && max_ssids > 1 &&
 867                             start != wpa_s->conf->ssid)
 868                                 ssid = wpa_s->conf->ssid;
 869                 }
 870
 871                 if (wpa_s->scan_id_count &&
 872                     wpa_s->last_scan_req == MANUAL_SCAN_REQ)
 873                         wpa_set_scan_ssids(wpa_s, &params, max_ssids);
 874
 875                 for (tssid = wpa_s->conf->ssid;
 876                      wpa_s->last_scan_req != MANUAL_SCAN_REQ && tssid;
 877                      tssid = tssid->next) {
 878                         if (wpas_network_disabled(wpa_s, tssid))
 879                                 continue;
 880                         if ((params.freqs || !freqs_set) && tssid->scan_freq) {
 881                                 int_array_concat(&params.freqs,
 882                                                  tssid->scan_freq);
 883                         } else {
 884                                 os_free(params.freqs);
 885                                 params.freqs = NULL;
 886                         }
 887                         freqs_set = 1;
 888                 }
 889                 int_array_sort_unique(params.freqs);
 890         }
 891
 892         if (ssid && max_ssids == 1) {
 893                 /*
 894                  * If the driver is limited to 1 SSID at a time interleave
 895                  * wildcard SSID scans with specific SSID scans to avoid
 896                  * waiting a long time for a wildcard scan.
 897                  */
 898                 if (!wpa_s->prev_scan_wildcard) {
 899                         params.ssids[0].ssid = NULL;
 900                         params.ssids[0].ssid_len = 0;
 901                         wpa_s->prev_scan_wildcard = 1;
 902                         wpa_dbg(wpa_s, MSG_DEBUG, "Starting AP scan for "
 903                                 "wildcard SSID (Interleave with specific)");
 904                 } else {
 905                         wpa_s->prev_scan_ssid = ssid;
 906                         wpa_s->prev_scan_wildcard = 0;
 907                         wpa_dbg(wpa_s, MSG_DEBUG,
 908                                 "Starting AP scan for specific SSID: %s",
 909                                 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
 910                 }
 911         } else if (ssid) {
 912                 /* max_ssids > 1 */
 913
 914                 wpa_s->prev_scan_ssid = ssid;
 915                 wpa_dbg(wpa_s, MSG_DEBUG, "Include wildcard SSID in "
 916                         "the scan request");
 917                 params.num_ssids++;
 918         } else if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
 919                    wpa_s->manual_scan_passive && params.num_ssids == 0) {
 920                 wpa_dbg(wpa_s, MSG_DEBUG, "Use passive scan based on manual request");
 921         } else if (wpa_s->conf->passive_scan) {
 922                 wpa_dbg(wpa_s, MSG_DEBUG,
 923                         "Use passive scan based on configuration");
 924         } else {
 925                 wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
 926                 params.num_ssids++;
 927                 wpa_dbg(wpa_s, MSG_DEBUG, "Starting AP scan for wildcard "
 928                         "SSID");
 929         }
 930
 931 ssid_list_set:
 932         wpa_supplicant_optimize_freqs(wpa_s, &params);
 933         extra_ie = wpa_supplicant_extra_ies(wpa_s);
 934
 935         if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
 936             wpa_s->manual_scan_only_new) {
 937                 wpa_printf(MSG_DEBUG,
 938                            "Request driver to clear scan cache due to manual only_new=1 scan");
 939                 params.only_new_results = 1;
 940         }
 941
 942         if (wpa_s->last_scan_req == MANUAL_SCAN_REQ && params.freqs == NULL &&
 943             wpa_s->manual_scan_freqs) {
 944                 wpa_dbg(wpa_s, MSG_DEBUG, "Limit manual scan to specified channels");
 945                 params.freqs = wpa_s->manual_scan_freqs;
 946                 wpa_s->manual_scan_freqs = NULL;
 947         }
 948
 949         if (params.freqs == NULL && wpa_s->next_scan_freqs) {
 950                 wpa_dbg(wpa_s, MSG_DEBUG, "Optimize scan based on previously "
 951                         "generated frequency list");
 952                 params.freqs = wpa_s->next_scan_freqs;
 953         } else
 954                 os_free(wpa_s->next_scan_freqs);
 955         wpa_s->next_scan_freqs = NULL;
 956         wpa_setband_scan_freqs(wpa_s, &params);
 957
 958         /* See if user specified frequencies. If so, scan only those. */
 959         if (wpa_s->conf->freq_list && !params.freqs) {
 960                 wpa_dbg(wpa_s, MSG_DEBUG,
 961                         "Optimize scan based on conf->freq_list");
 962                 int_array_concat(&params.freqs, wpa_s->conf->freq_list);
 963         }
 964
 965         /* Use current associated channel? */
 966         if (wpa_s->conf->scan_cur_freq && !params.freqs) {
 967                 unsigned int num = wpa_s->num_multichan_concurrent;
 968
 969                 params.freqs = os_calloc(num + 1, sizeof(int));
 970                 if (params.freqs) {
 971                         num = get_shared_radio_freqs(wpa_s, params.freqs, num);
 972                         if (num > 0) {
 973                                 wpa_dbg(wpa_s, MSG_DEBUG, "Scan only the "
 974                                         "current operating channels since "
 975                                         "scan_cur_freq is enabled");
 976                         } else {
 977                                 os_free(params.freqs);
 978                                 params.freqs = NULL;
 979                         }
 980                 }
 981         }
 982
 983         params.filter_ssids = wpa_supplicant_build_filter_ssids(
 984                 wpa_s->conf, &params.num_filter_ssids);
 985         if (extra_ie) {
 986                 params.extra_ies = wpabuf_head(extra_ie);
 987                 params.extra_ies_len = wpabuf_len(extra_ie);
 988         }
 989
 990 #ifdef CONFIG_P2P
 991         if (wpa_s->p2p_in_provisioning || wpa_s->p2p_in_invitation ||
 992             (wpa_s->show_group_started && wpa_s->go_params)) {
 993                 /*
 994                  * The interface may not yet be in P2P mode, so we have to
 995                  * explicitly request P2P probe to disable CCK rates.
 996                  */
 997                 params.p2p_probe = 1;
 998         }
 999 #endif /* CONFIG_P2P */
1000
1001         if (wpa_s->mac_addr_rand_enable & MAC_ADDR_RAND_SCAN) {
1002                 params.mac_addr_rand = 1;
1003                 if (wpa_s->mac_addr_scan) {
1004                         params.mac_addr = wpa_s->mac_addr_scan;
1005                         params.mac_addr_mask = wpa_s->mac_addr_scan + ETH_ALEN;
1006                 }
1007         }
1008
1009         if (!is_zero_ether_addr(wpa_s->next_scan_bssid)) {
1010                 struct wpa_bss *bss;
1011
1012                 params.bssid = wpa_s->next_scan_bssid;
1013                 bss = wpa_bss_get_bssid_latest(wpa_s, params.bssid);
1014                 if (bss && bss->ssid_len && params.num_ssids == 1 &&
1015                     params.ssids[0].ssid_len == 0) {
1016                         params.ssids[0].ssid = bss->ssid;
1017                         params.ssids[0].ssid_len = bss->ssid_len;
1018                         wpa_dbg(wpa_s, MSG_DEBUG,
1019                                 "Scan a previously specified BSSID " MACSTR
1020                                 " and SSID %s",
1021                                 MAC2STR(params.bssid),
1022                                 wpa_ssid_txt(bss->ssid, bss->ssid_len));
1023                 } else {
1024                         wpa_dbg(wpa_s, MSG_DEBUG,
1025                                 "Scan a previously specified BSSID " MACSTR,
1026                                 MAC2STR(params.bssid));
1027                 }
1028         }
1029
1030         scan_params = &params;
1031
1032 scan:
1033 #ifdef CONFIG_P2P
1034         /*
1035          * If the driver does not support multi-channel concurrency and a
1036          * virtual interface that shares the same radio with the wpa_s interface
1037          * is operating there may not be need to scan other channels apart from
1038          * the current operating channel on the other virtual interface. Filter
1039          * out other channels in case we are trying to find a connection for a
1040          * station interface when we are not configured to prefer station
1041          * connection and a concurrent operation is already in process.
1042          */
1043         if (wpa_s->scan_for_connection &&
1044             wpa_s->last_scan_req == NORMAL_SCAN_REQ &&
1045             !scan_params->freqs && !params.freqs &&
1046             wpas_is_p2p_prioritized(wpa_s) &&
1047             wpa_s->p2p_group_interface == NOT_P2P_GROUP_INTERFACE &&
1048             non_p2p_network_enabled(wpa_s)) {
1049                 unsigned int num = wpa_s->num_multichan_concurrent;
1050
1051                 params.freqs = os_calloc(num + 1, sizeof(int));
1052                 if (params.freqs) {
1053                         num = get_shared_radio_freqs(wpa_s, params.freqs, num);
1054                         if (num > 0 && num == wpa_s->num_multichan_concurrent) {
1055                                 wpa_dbg(wpa_s, MSG_DEBUG, "Scan only the current operating channels since all channels are already used");
1056                         } else {
1057                                 os_free(params.freqs);
1058                                 params.freqs = NULL;
1059                         }
1060                 }
1061         }
1062 #endif /* CONFIG_P2P */
1063
1064         ret = wpa_supplicant_trigger_scan(wpa_s, scan_params);
1065
1066         if (ret && wpa_s->last_scan_req == MANUAL_SCAN_REQ && params.freqs &&
1067             !wpa_s->manual_scan_freqs) {
1068                 /* Restore manual_scan_freqs for the next attempt */
1069                 wpa_s->manual_scan_freqs = params.freqs;
1070                 params.freqs = NULL;
1071         }
1072
1073         wpabuf_free(extra_ie);
1074         os_free(params.freqs);
1075         os_free(params.filter_ssids);
1076
1077         if (ret) {
1078                 wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate AP scan");
1079                 if (wpa_s->scan_prev_wpa_state != wpa_s->wpa_state)
1080                         wpa_supplicant_set_state(wpa_s,
1081                                                  wpa_s->scan_prev_wpa_state);
1082                 /* Restore scan_req since we will try to scan again */
1083                 wpa_s->scan_req = wpa_s->last_scan_req;
1084                 wpa_supplicant_req_scan(wpa_s, 1, 0);
1085         } else {
1086                 wpa_s->scan_for_connection = 0;
1087 #ifdef CONFIG_INTERWORKING
1088                 wpa_s->interworking_fast_assoc_tried = 0;
1089 #endif /* CONFIG_INTERWORKING */
1090                 if (params.bssid)
1091                         os_memset(wpa_s->next_scan_bssid, 0, ETH_ALEN);
1092         }
1093 }
1094
1095
1096 void wpa_supplicant_update_scan_int(struct wpa_supplicant *wpa_s, int sec)
1097 {
1098         struct os_reltime remaining, new_int;
1099         int cancelled;
1100
1101         cancelled = eloop_cancel_timeout_one(wpa_supplicant_scan, wpa_s, NULL,
1102                                              &remaining);
1103
1104         new_int.sec = sec;
1105         new_int.usec = 0;
1106         if (cancelled && os_reltime_before(&remaining, &new_int)) {
1107                 new_int.sec = remaining.sec;
1108                 new_int.usec = remaining.usec;
1109         }
1110
1111         if (cancelled) {
1112                 eloop_register_timeout(new_int.sec, new_int.usec,
1113                                        wpa_supplicant_scan, wpa_s, NULL);
1114         }
1115         wpa_s->scan_interval = sec;
1116 }
1117
1118
1119 /**
1120  * wpa_supplicant_req_scan - Schedule a scan for neighboring access points
1121  * @wpa_s: Pointer to wpa_supplicant data
1122  * @sec: Number of seconds after which to scan
1123  * @usec: Number of microseconds after which to scan
1124  *
1125  * This function is used to schedule a scan for neighboring access points after
1126  * the specified time.
1127  */
1128 void wpa_supplicant_req_scan(struct wpa_supplicant *wpa_s, int sec, int usec)
1129 {
1130         int res;
1131
1132         if (wpa_s->p2p_mgmt) {
1133                 wpa_dbg(wpa_s, MSG_DEBUG,
1134                         "Ignore scan request (%d.%06d sec) on p2p_mgmt interface",
1135                         sec, usec);
1136                 return;
1137         }
1138
1139         res = eloop_deplete_timeout(sec, usec, wpa_supplicant_scan, wpa_s,
1140                                     NULL);
1141         if (res == 1) {
1142                 wpa_dbg(wpa_s, MSG_DEBUG, "Rescheduling scan request: %d.%06d sec",
1143                         sec, usec);
1144         } else if (res == 0) {
1145                 wpa_dbg(wpa_s, MSG_DEBUG, "Ignore new scan request for %d.%06d sec since an earlier request is scheduled to trigger sooner",
1146                         sec, usec);
1147         } else {
1148                 wpa_dbg(wpa_s, MSG_DEBUG, "Setting scan request: %d.%06d sec",
1149                         sec, usec);
1150                 eloop_register_timeout(sec, usec, wpa_supplicant_scan, wpa_s, NULL);
1151         }
1152 }
1153
1154
1155 /**
1156  * wpa_supplicant_delayed_sched_scan - Request a delayed scheduled scan
1157  * @wpa_s: Pointer to wpa_supplicant data
1158  * @sec: Number of seconds after which to scan
1159  * @usec: Number of microseconds after which to scan
1160  * Returns: 0 on success or -1 otherwise
1161  *
1162  * This function is used to schedule periodic scans for neighboring
1163  * access points after the specified time.
1164  */
1165 int wpa_supplicant_delayed_sched_scan(struct wpa_supplicant *wpa_s,
1166                                       int sec, int usec)
1167 {
1168         if (!wpa_s->sched_scan_supported)
1169                 return -1;
1170
1171         eloop_register_timeout(sec, usec,
1172                                wpa_supplicant_delayed_sched_scan_timeout,
1173                                wpa_s, NULL);
1174
1175         return 0;
1176 }
1177
1178
1179 /**
1180  * wpa_supplicant_req_sched_scan - Start a periodic scheduled scan
1181  * @wpa_s: Pointer to wpa_supplicant data
1182  * Returns: 0 is sched_scan was started or -1 otherwise
1183  *
1184  * This function is used to schedule periodic scans for neighboring
1185  * access points repeating the scan continuously.
1186  */
1187 int wpa_supplicant_req_sched_scan(struct wpa_supplicant *wpa_s)
1188 {
1189         struct wpa_driver_scan_params params;
1190         struct wpa_driver_scan_params *scan_params;
1191         enum wpa_states prev_state;
1192         struct wpa_ssid *ssid = NULL;
1193         struct wpabuf *extra_ie = NULL;
1194         int ret;
1195         unsigned int max_sched_scan_ssids;
1196         int wildcard = 0;
1197         int need_ssids;
1198         struct sched_scan_plan scan_plan;
1199
1200         if (!wpa_s->sched_scan_supported)
1201                 return -1;
1202
1203         if (wpa_s->max_sched_scan_ssids > WPAS_MAX_SCAN_SSIDS)
1204                 max_sched_scan_ssids = WPAS_MAX_SCAN_SSIDS;
1205         else
1206                 max_sched_scan_ssids = wpa_s->max_sched_scan_ssids;
1207         if (max_sched_scan_ssids < 1 || wpa_s->conf->disable_scan_offload)
1208                 return -1;
1209
1210         if (wpa_s->sched_scanning) {
1211                 wpa_dbg(wpa_s, MSG_DEBUG, "Already sched scanning");
1212                 return 0;
1213         }
1214
1215         need_ssids = 0;
1216         for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
1217                 if (!wpas_network_disabled(wpa_s, ssid) && !ssid->scan_ssid) {
1218                         /* Use wildcard SSID to find this network */
1219                         wildcard = 1;
1220                 } else if (!wpas_network_disabled(wpa_s, ssid) &&
1221                            ssid->ssid_len)
1222                         need_ssids++;
1223
1224 #ifdef CONFIG_WPS
1225                 if (!wpas_network_disabled(wpa_s, ssid) &&
1226                     ssid->key_mgmt == WPA_KEY_MGMT_WPS) {
1227                         /*
1228                          * Normal scan is more reliable and faster for WPS
1229                          * operations and since these are for short periods of
1230                          * time, the benefit of trying to use sched_scan would
1231                          * be limited.
1232                          */
1233                         wpa_dbg(wpa_s, MSG_DEBUG, "Use normal scan instead of "
1234                                 "sched_scan for WPS");
1235                         return -1;
1236                 }
1237 #endif /* CONFIG_WPS */
1238         }
1239         if (wildcard)
1240                 need_ssids++;
1241
1242         if (wpa_s->normal_scans < 3 &&
1243             (need_ssids <= wpa_s->max_scan_ssids ||
1244              wpa_s->max_scan_ssids >= (int) max_sched_scan_ssids)) {
1245                 /*
1246                  * When normal scan can speed up operations, use that for the
1247                  * first operations before starting the sched_scan to allow
1248                  * user space sleep more. We do this only if the normal scan
1249                  * has functionality that is suitable for this or if the
1250                  * sched_scan does not have better support for multiple SSIDs.
1251                  */
1252                 wpa_dbg(wpa_s, MSG_DEBUG, "Use normal scan instead of "
1253                         "sched_scan for initial scans (normal_scans=%d)",
1254                         wpa_s->normal_scans);
1255                 return -1;
1256         }
1257
1258         os_memset(&params, 0, sizeof(params));
1259
1260         /* If we can't allocate space for the filters, we just don't filter */
1261         params.filter_ssids = os_calloc(wpa_s->max_match_sets,
1262                                         sizeof(struct wpa_driver_scan_filter));
1263
1264         prev_state = wpa_s->wpa_state;
1265         if (wpa_s->wpa_state == WPA_DISCONNECTED ||
1266             wpa_s->wpa_state == WPA_INACTIVE)
1267                 wpa_supplicant_set_state(wpa_s, WPA_SCANNING);
1268
1269         if (wpa_s->autoscan_params != NULL) {
1270                 scan_params = wpa_s->autoscan_params;
1271                 goto scan;
1272         }
1273
1274         /* Find the starting point from which to continue scanning */
1275         ssid = wpa_s->conf->ssid;
1276         if (wpa_s->prev_sched_ssid) {
1277                 while (ssid) {
1278                         if (ssid == wpa_s->prev_sched_ssid) {
1279                                 ssid = ssid->next;
1280                                 break;
1281                         }
1282                         ssid = ssid->next;
1283                 }
1284         }
1285
1286         if (!ssid || !wpa_s->prev_sched_ssid) {
1287                 wpa_dbg(wpa_s, MSG_DEBUG, "Beginning of SSID list");
1288                 wpa_s->sched_scan_timeout = max_sched_scan_ssids * 2;
1289                 wpa_s->first_sched_scan = 1;
1290                 ssid = wpa_s->conf->ssid;
1291                 wpa_s->prev_sched_ssid = ssid;
1292         }
1293
1294         if (wildcard) {
1295                 wpa_dbg(wpa_s, MSG_DEBUG, "Add wildcard SSID to sched_scan");
1296                 params.num_ssids++;
1297         }
1298
1299         while (ssid) {
1300                 if (wpas_network_disabled(wpa_s, ssid))
1301                         goto next;
1302
1303                 if (params.num_filter_ssids < wpa_s->max_match_sets &&
1304                     params.filter_ssids && ssid->ssid && ssid->ssid_len) {
1305                         wpa_dbg(wpa_s, MSG_DEBUG, "add to filter ssid: %s",
1306                                 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
1307                         os_memcpy(params.filter_ssids[params.num_filter_ssids].ssid,
1308                                   ssid->ssid, ssid->ssid_len);
1309                         params.filter_ssids[params.num_filter_ssids].ssid_len =
1310                                 ssid->ssid_len;
1311                         params.num_filter_ssids++;
1312                 } else if (params.filter_ssids && ssid->ssid && ssid->ssid_len)
1313                 {
1314                         wpa_dbg(wpa_s, MSG_DEBUG, "Not enough room for SSID "
1315                                 "filter for sched_scan - drop filter");
1316                         os_free(params.filter_ssids);
1317                         params.filter_ssids = NULL;
1318                         params.num_filter_ssids = 0;
1319                 }
1320
1321                 if (ssid->scan_ssid && ssid->ssid && ssid->ssid_len) {
1322                         if (params.num_ssids == max_sched_scan_ssids)
1323                                 break; /* only room for broadcast SSID */
1324                         wpa_dbg(wpa_s, MSG_DEBUG,
1325                                 "add to active scan ssid: %s",
1326                                 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
1327                         params.ssids[params.num_ssids].ssid =
1328                                 ssid->ssid;
1329                         params.ssids[params.num_ssids].ssid_len =
1330                                 ssid->ssid_len;
1331                         params.num_ssids++;
1332                         if (params.num_ssids >= max_sched_scan_ssids) {
1333                                 wpa_s->prev_sched_ssid = ssid;
1334                                 do {
1335                                         ssid = ssid->next;
1336                                 } while (ssid &&
1337                                          (wpas_network_disabled(wpa_s, ssid) ||
1338                                           !ssid->scan_ssid));
1339                                 break;
1340                         }
1341                 }
1342
1343         next:
1344                 wpa_s->prev_sched_ssid = ssid;
1345                 ssid = ssid->next;
1346         }
1347
1348         if (params.num_filter_ssids == 0) {
1349                 os_free(params.filter_ssids);
1350                 params.filter_ssids = NULL;
1351         }
1352
1353         extra_ie = wpa_supplicant_extra_ies(wpa_s);
1354         if (extra_ie) {
1355                 params.extra_ies = wpabuf_head(extra_ie);
1356                 params.extra_ies_len = wpabuf_len(extra_ie);
1357         }
1358
1359         if (wpa_s->conf->filter_rssi)
1360                 params.filter_rssi = wpa_s->conf->filter_rssi;
1361
1362         /* See if user specified frequencies. If so, scan only those. */
1363         if (wpa_s->conf->freq_list && !params.freqs) {
1364                 wpa_dbg(wpa_s, MSG_DEBUG,
1365                         "Optimize scan based on conf->freq_list");
1366                 int_array_concat(&params.freqs, wpa_s->conf->freq_list);
1367         }
1368
1369         scan_params = &params;
1370
1371 scan:
1372         wpa_s->sched_scan_timed_out = 0;
1373
1374         /*
1375          * We cannot support multiple scan plans if the scan request includes
1376          * too many SSID's, so in this case use only the last scan plan and make
1377          * it run infinitely. It will be stopped by the timeout.
1378          */
1379         if (wpa_s->sched_scan_plans_num == 1 ||
1380             (wpa_s->sched_scan_plans_num && !ssid && wpa_s->first_sched_scan)) {
1381                 params.sched_scan_plans = wpa_s->sched_scan_plans;
1382                 params.sched_scan_plans_num = wpa_s->sched_scan_plans_num;
1383         } else if (wpa_s->sched_scan_plans_num > 1) {
1384                 wpa_dbg(wpa_s, MSG_DEBUG,
1385                         "Too many SSIDs. Default to using single scheduled_scan plan");
1386                 params.sched_scan_plans =
1387                         &wpa_s->sched_scan_plans[wpa_s->sched_scan_plans_num -
1388                                                  1];
1389                 params.sched_scan_plans_num = 1;
1390         } else {
1391                 if (wpa_s->conf->sched_scan_interval)
1392                         scan_plan.interval = wpa_s->conf->sched_scan_interval;
1393                 else
1394                         scan_plan.interval = 10;
1395
1396                 if (scan_plan.interval > wpa_s->max_sched_scan_plan_interval) {
1397                         wpa_printf(MSG_WARNING,
1398                                    "Scan interval too long(%u), use the maximum allowed(%u)",
1399                                    scan_plan.interval,
1400                                    wpa_s->max_sched_scan_plan_interval);
1401                         scan_plan.interval =
1402                                 wpa_s->max_sched_scan_plan_interval;
1403                 }
1404
1405                 scan_plan.iterations = 0;
1406                 params.sched_scan_plans = &scan_plan;
1407                 params.sched_scan_plans_num = 1;
1408         }
1409
1410         if (ssid || !wpa_s->first_sched_scan) {
1411                 wpa_dbg(wpa_s, MSG_DEBUG,
1412                         "Starting sched scan: interval %u timeout %d",
1413                         params.sched_scan_plans[0].interval,
1414                         wpa_s->sched_scan_timeout);
1415         } else {
1416                 wpa_dbg(wpa_s, MSG_DEBUG, "Starting sched scan (no timeout)");
1417         }
1418
1419         wpa_setband_scan_freqs(wpa_s, scan_params);
1420
1421         if (wpa_s->mac_addr_rand_enable & MAC_ADDR_RAND_SCHED_SCAN) {
1422                 params.mac_addr_rand = 1;
1423                 if (wpa_s->mac_addr_sched_scan) {
1424                         params.mac_addr = wpa_s->mac_addr_sched_scan;
1425                         params.mac_addr_mask = wpa_s->mac_addr_sched_scan +
1426                                 ETH_ALEN;
1427                 }
1428         }
1429
1430         ret = wpa_supplicant_start_sched_scan(wpa_s, scan_params);
1431         wpabuf_free(extra_ie);
1432         os_free(params.filter_ssids);
1433         if (ret) {
1434                 wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate sched scan");
1435                 if (prev_state != wpa_s->wpa_state)
1436                         wpa_supplicant_set_state(wpa_s, prev_state);
1437                 return ret;
1438         }
1439
1440         /* If we have more SSIDs to scan, add a timeout so we scan them too */
1441         if (ssid || !wpa_s->first_sched_scan) {
1442                 wpa_s->sched_scan_timed_out = 0;
1443                 eloop_register_timeout(wpa_s->sched_scan_timeout, 0,
1444                                        wpa_supplicant_sched_scan_timeout,
1445                                        wpa_s, NULL);
1446                 wpa_s->first_sched_scan = 0;
1447                 wpa_s->sched_scan_timeout /= 2;
1448                 params.sched_scan_plans[0].interval *= 2;
1449                 if ((unsigned int) wpa_s->sched_scan_timeout <
1450                     params.sched_scan_plans[0].interval ||
1451                     params.sched_scan_plans[0].interval >
1452                     wpa_s->max_sched_scan_plan_interval) {
1453                         params.sched_scan_plans[0].interval = 10;
1454                         wpa_s->sched_scan_timeout = max_sched_scan_ssids * 2;
1455                 }
1456         }
1457
1458         /* If there is no more ssids, start next time from the beginning */
1459         if (!ssid)
1460                 wpa_s->prev_sched_ssid = NULL;
1461
1462         return 0;
1463 }
1464
1465
1466 /**
1467  * wpa_supplicant_cancel_scan - Cancel a scheduled scan request
1468  * @wpa_s: Pointer to wpa_supplicant data
1469  *
1470  * This function is used to cancel a scan request scheduled with
1471  * wpa_supplicant_req_scan().
1472  */
1473 void wpa_supplicant_cancel_scan(struct wpa_supplicant *wpa_s)
1474 {
1475         wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling scan request");
1476         eloop_cancel_timeout(wpa_supplicant_scan, wpa_s, NULL);
1477 }
1478
1479
1480 /**
1481  * wpa_supplicant_cancel_delayed_sched_scan - Stop a delayed scheduled scan
1482  * @wpa_s: Pointer to wpa_supplicant data
1483  *
1484  * This function is used to stop a delayed scheduled scan.
1485  */
1486 void wpa_supplicant_cancel_delayed_sched_scan(struct wpa_supplicant *wpa_s)
1487 {
1488         if (!wpa_s->sched_scan_supported)
1489                 return;
1490
1491         wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling delayed sched scan");
1492         eloop_cancel_timeout(wpa_supplicant_delayed_sched_scan_timeout,
1493                              wpa_s, NULL);
1494 }
1495
1496
1497 /**
1498  * wpa_supplicant_cancel_sched_scan - Stop running scheduled scans
1499  * @wpa_s: Pointer to wpa_supplicant data
1500  *
1501  * This function is used to stop a periodic scheduled scan.
1502  */
1503 void wpa_supplicant_cancel_sched_scan(struct wpa_supplicant *wpa_s)
1504 {
1505         if (!wpa_s->sched_scanning)
1506                 return;
1507
1508         wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling sched scan");
1509         eloop_cancel_timeout(wpa_supplicant_sched_scan_timeout, wpa_s, NULL);
1510         wpa_supplicant_stop_sched_scan(wpa_s);
1511 }
1512
1513
1514 /**
1515  * wpa_supplicant_notify_scanning - Indicate possible scan state change
1516  * @wpa_s: Pointer to wpa_supplicant data
1517  * @scanning: Whether scanning is currently in progress
1518  *
1519  * This function is to generate scanning notifycations. It is called whenever
1520  * there may have been a change in scanning (scan started, completed, stopped).
1521  * wpas_notify_scanning() is called whenever the scanning state changed from the
1522  * previously notified state.
1523  */
1524 void wpa_supplicant_notify_scanning(struct wpa_supplicant *wpa_s,
1525                                     int scanning)
1526 {
1527         if (wpa_s->scanning != scanning) {
1528                 wpa_s->scanning = scanning;
1529                 wpas_notify_scanning(wpa_s);
1530         }
1531 }
1532
1533
1534 static int wpa_scan_get_max_rate(const struct wpa_scan_res *res)
1535 {
1536         int rate = 0;
1537         const u8 *ie;
1538         int i;
1539
1540         ie = wpa_scan_get_ie(res, WLAN_EID_SUPP_RATES);
1541         for (i = 0; ie && i < ie[1]; i++) {
1542                 if ((ie[i + 2] & 0x7f) > rate)
1543                         rate = ie[i + 2] & 0x7f;
1544         }
1545
1546         ie = wpa_scan_get_ie(res, WLAN_EID_EXT_SUPP_RATES);
1547         for (i = 0; ie && i < ie[1]; i++) {
1548                 if ((ie[i + 2] & 0x7f) > rate)
1549                         rate = ie[i + 2] & 0x7f;
1550         }
1551
1552         return rate;
1553 }
1554
1555
1556 /**
1557  * wpa_scan_get_ie - Fetch a specified information element from a scan result
1558  * @res: Scan result entry
1559  * @ie: Information element identitifier (WLAN_EID_*)
1560  * Returns: Pointer to the information element (id field) or %NULL if not found
1561  *
1562  * This function returns the first matching information element in the scan
1563  * result.
1564  */
1565 const u8 * wpa_scan_get_ie(const struct wpa_scan_res *res, u8 ie)
1566 {
1567         return get_ie((const u8 *) (res + 1), res->ie_len, ie);
1568 }
1569
1570
1571 /**
1572  * wpa_scan_get_vendor_ie - Fetch vendor information element from a scan result
1573  * @res: Scan result entry
1574  * @vendor_type: Vendor type (four octets starting the IE payload)
1575  * Returns: Pointer to the information element (id field) or %NULL if not found
1576  *
1577  * This function returns the first matching information element in the scan
1578  * result.
1579  */
1580 const u8 * wpa_scan_get_vendor_ie(const struct wpa_scan_res *res,
1581                                   u32 vendor_type)
1582 {
1583         const u8 *end, *pos;
1584
1585         pos = (const u8 *) (res + 1);
1586         end = pos + res->ie_len;
1587
1588         while (end - pos > 1) {
1589                 if (2 + pos[1] > end - pos)
1590                         break;
1591                 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1592                     vendor_type == WPA_GET_BE32(&pos[2]))
1593                         return pos;
1594                 pos += 2 + pos[1];
1595         }
1596
1597         return NULL;
1598 }
1599
1600
1601 /**
1602  * wpa_scan_get_vendor_ie_beacon - Fetch vendor information from a scan result
1603  * @res: Scan result entry
1604  * @vendor_type: Vendor type (four octets starting the IE payload)
1605  * Returns: Pointer to the information element (id field) or %NULL if not found
1606  *
1607  * This function returns the first matching information element in the scan
1608  * result.
1609  *
1610  * This function is like wpa_scan_get_vendor_ie(), but uses IE buffer only
1611  * from Beacon frames instead of either Beacon or Probe Response frames.
1612  */
1613 const u8 * wpa_scan_get_vendor_ie_beacon(const struct wpa_scan_res *res,
1614                                          u32 vendor_type)
1615 {
1616         const u8 *end, *pos;
1617
1618         if (res->beacon_ie_len == 0)
1619                 return NULL;
1620
1621         pos = (const u8 *) (res + 1);
1622         pos += res->ie_len;
1623         end = pos + res->beacon_ie_len;
1624
1625         while (end - pos > 1) {
1626                 if (2 + pos[1] > end - pos)
1627                         break;
1628                 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1629                     vendor_type == WPA_GET_BE32(&pos[2]))
1630                         return pos;
1631                 pos += 2 + pos[1];
1632         }
1633
1634         return NULL;
1635 }
1636
1637
1638 /**
1639  * wpa_scan_get_vendor_ie_multi - Fetch vendor IE data from a scan result
1640  * @res: Scan result entry
1641  * @vendor_type: Vendor type (four octets starting the IE payload)
1642  * Returns: Pointer to the information element payload or %NULL if not found
1643  *
1644  * This function returns concatenated payload of possibly fragmented vendor
1645  * specific information elements in the scan result. The caller is responsible
1646  * for freeing the returned buffer.
1647  */
1648 struct wpabuf * wpa_scan_get_vendor_ie_multi(const struct wpa_scan_res *res,
1649                                              u32 vendor_type)
1650 {
1651         struct wpabuf *buf;
1652         const u8 *end, *pos;
1653
1654         buf = wpabuf_alloc(res->ie_len);
1655         if (buf == NULL)
1656                 return NULL;
1657
1658         pos = (const u8 *) (res + 1);
1659         end = pos + res->ie_len;
1660
1661         while (end - pos > 1) {
1662                 if (2 + pos[1] > end - pos)
1663                         break;
1664                 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1665                     vendor_type == WPA_GET_BE32(&pos[2]))
1666                         wpabuf_put_data(buf, pos + 2 + 4, pos[1] - 4);
1667                 pos += 2 + pos[1];
1668         }
1669
1670         if (wpabuf_len(buf) == 0) {
1671                 wpabuf_free(buf);
1672                 buf = NULL;
1673         }
1674
1675         return buf;
1676 }
1677
1678
1679 /*
1680  * Channels with a great SNR can operate at full rate. What is a great SNR?
1681  * This doc https://supportforums.cisco.com/docs/DOC-12954 says, "the general
1682  * rule of thumb is that any SNR above 20 is good." This one
1683  * http://www.cisco.com/en/US/tech/tk722/tk809/technologies_q_and_a_item09186a00805e9a96.shtml#qa23
1684  * recommends 25 as a minimum SNR for 54 Mbps data rate. 30 is chosen here as a
1685  * conservative value.
1686  */
1687 #define GREAT_SNR 30
1688
1689 #define IS_5GHZ(n) (n > 4000)
1690
1691 /* Compare function for sorting scan results. Return >0 if @b is considered
1692  * better. */
1693 static int wpa_scan_result_compar(const void *a, const void *b)
1694 {
1695 #define MIN(a,b) a < b ? a : b
1696         struct wpa_scan_res **_wa = (void *) a;
1697         struct wpa_scan_res **_wb = (void *) b;
1698         struct wpa_scan_res *wa = *_wa;
1699         struct wpa_scan_res *wb = *_wb;
1700         int wpa_a, wpa_b;
1701         int snr_a, snr_b, snr_a_full, snr_b_full;
1702
1703         /* WPA/WPA2 support preferred */
1704         wpa_a = wpa_scan_get_vendor_ie(wa, WPA_IE_VENDOR_TYPE) != NULL ||
1705                 wpa_scan_get_ie(wa, WLAN_EID_RSN) != NULL;
1706         wpa_b = wpa_scan_get_vendor_ie(wb, WPA_IE_VENDOR_TYPE) != NULL ||
1707                 wpa_scan_get_ie(wb, WLAN_EID_RSN) != NULL;
1708
1709         if (wpa_b && !wpa_a)
1710                 return 1;
1711         if (!wpa_b && wpa_a)
1712                 return -1;
1713
1714         /* privacy support preferred */
1715         if ((wa->caps & IEEE80211_CAP_PRIVACY) == 0 &&
1716             (wb->caps & IEEE80211_CAP_PRIVACY))
1717                 return 1;
1718         if ((wa->caps & IEEE80211_CAP_PRIVACY) &&
1719             (wb->caps & IEEE80211_CAP_PRIVACY) == 0)
1720                 return -1;
1721
1722         if (wa->flags & wb->flags & WPA_SCAN_LEVEL_DBM) {
1723                 snr_a_full = wa->snr;
1724                 snr_a = MIN(wa->snr, GREAT_SNR);
1725                 snr_b_full = wb->snr;
1726                 snr_b = MIN(wb->snr, GREAT_SNR);
1727         } else {
1728                 /* Level is not in dBm, so we can't calculate
1729                  * SNR. Just use raw level (units unknown). */
1730                 snr_a = snr_a_full = wa->level;
1731                 snr_b = snr_b_full = wb->level;
1732         }
1733
1734         /* if SNR is close, decide by max rate or frequency band */
1735         if ((snr_a && snr_b && abs(snr_b - snr_a) < 5) ||
1736             (wa->qual && wb->qual && abs(wb->qual - wa->qual) < 10)) {
1737                 if (wa->est_throughput != wb->est_throughput)
1738                         return wb->est_throughput - wa->est_throughput;
1739                 if (IS_5GHZ(wa->freq) ^ IS_5GHZ(wb->freq))
1740                         return IS_5GHZ(wa->freq) ? -1 : 1;
1741         }
1742
1743         /* all things being equal, use SNR; if SNRs are
1744          * identical, use quality values since some drivers may only report
1745          * that value and leave the signal level zero */
1746         if (snr_b_full == snr_a_full)
1747                 return wb->qual - wa->qual;
1748         return snr_b_full - snr_a_full;
1749 #undef MIN
1750 }
1751
1752
1753 #ifdef CONFIG_WPS
1754 /* Compare function for sorting scan results when searching a WPS AP for
1755  * provisioning. Return >0 if @b is considered better. */
1756 static int wpa_scan_result_wps_compar(const void *a, const void *b)
1757 {
1758         struct wpa_scan_res **_wa = (void *) a;
1759         struct wpa_scan_res **_wb = (void *) b;
1760         struct wpa_scan_res *wa = *_wa;
1761         struct wpa_scan_res *wb = *_wb;
1762         int uses_wps_a, uses_wps_b;
1763         struct wpabuf *wps_a, *wps_b;
1764         int res;
1765
1766         /* Optimization - check WPS IE existence before allocated memory and
1767          * doing full reassembly. */
1768         uses_wps_a = wpa_scan_get_vendor_ie(wa, WPS_IE_VENDOR_TYPE) != NULL;
1769         uses_wps_b = wpa_scan_get_vendor_ie(wb, WPS_IE_VENDOR_TYPE) != NULL;
1770         if (uses_wps_a && !uses_wps_b)
1771                 return -1;
1772         if (!uses_wps_a && uses_wps_b)
1773                 return 1;
1774
1775         if (uses_wps_a && uses_wps_b) {
1776                 wps_a = wpa_scan_get_vendor_ie_multi(wa, WPS_IE_VENDOR_TYPE);
1777                 wps_b = wpa_scan_get_vendor_ie_multi(wb, WPS_IE_VENDOR_TYPE);
1778                 res = wps_ap_priority_compar(wps_a, wps_b);
1779                 wpabuf_free(wps_a);
1780                 wpabuf_free(wps_b);
1781                 if (res)
1782                         return res;
1783         }
1784
1785         /*
1786          * Do not use current AP security policy as a sorting criteria during
1787          * WPS provisioning step since the AP may get reconfigured at the
1788          * completion of provisioning.
1789          */
1790
1791         /* all things being equal, use signal level; if signal levels are
1792          * identical, use quality values since some drivers may only report
1793          * that value and leave the signal level zero */
1794         if (wb->level == wa->level)
1795                 return wb->qual - wa->qual;
1796         return wb->level - wa->level;
1797 }
1798 #endif /* CONFIG_WPS */
1799
1800
1801 static void dump_scan_res(struct wpa_scan_results *scan_res)
1802 {
1803 #ifndef CONFIG_NO_STDOUT_DEBUG
1804         size_t i;
1805
1806         if (scan_res->res == NULL || scan_res->num == 0)
1807                 return;
1808
1809         wpa_printf(MSG_EXCESSIVE, "Sorted scan results");
1810
1811         for (i = 0; i < scan_res->num; i++) {
1812                 struct wpa_scan_res *r = scan_res->res[i];
1813                 u8 *pos;
1814                 if (r->flags & WPA_SCAN_LEVEL_DBM) {
1815                         int noise_valid = !(r->flags & WPA_SCAN_NOISE_INVALID);
1816
1817                         wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d "
1818                                    "noise=%d%s level=%d snr=%d%s flags=0x%x age=%u est=%u",
1819                                    MAC2STR(r->bssid), r->freq, r->qual,
1820                                    r->noise, noise_valid ? "" : "~", r->level,
1821                                    r->snr, r->snr >= GREAT_SNR ? "*" : "",
1822                                    r->flags,
1823                                    r->age, r->est_throughput);
1824                 } else {
1825                         wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d "
1826                                    "noise=%d level=%d flags=0x%x age=%u est=%u",
1827                                    MAC2STR(r->bssid), r->freq, r->qual,
1828                                    r->noise, r->level, r->flags, r->age,
1829                                    r->est_throughput);
1830                 }
1831                 pos = (u8 *) (r + 1);
1832                 if (r->ie_len)
1833                         wpa_hexdump(MSG_EXCESSIVE, "IEs", pos, r->ie_len);
1834                 pos += r->ie_len;
1835                 if (r->beacon_ie_len)
1836                         wpa_hexdump(MSG_EXCESSIVE, "Beacon IEs",
1837                                     pos, r->beacon_ie_len);
1838         }
1839 #endif /* CONFIG_NO_STDOUT_DEBUG */
1840 }
1841
1842
1843 /**
1844  * wpa_supplicant_filter_bssid_match - Is the specified BSSID allowed
1845  * @wpa_s: Pointer to wpa_supplicant data
1846  * @bssid: BSSID to check
1847  * Returns: 0 if the BSSID is filtered or 1 if not
1848  *
1849  * This function is used to filter out specific BSSIDs from scan reslts mainly
1850  * for testing purposes (SET bssid_filter ctrl_iface command).
1851  */
1852 int wpa_supplicant_filter_bssid_match(struct wpa_supplicant *wpa_s,
1853                                       const u8 *bssid)
1854 {
1855         size_t i;
1856
1857         if (wpa_s->bssid_filter == NULL)
1858                 return 1;
1859
1860         for (i = 0; i < wpa_s->bssid_filter_count; i++) {
1861                 if (os_memcmp(wpa_s->bssid_filter + i * ETH_ALEN, bssid,
1862                               ETH_ALEN) == 0)
1863                         return 1;
1864         }
1865
1866         return 0;
1867 }
1868
1869
1870 static void filter_scan_res(struct wpa_supplicant *wpa_s,
1871                             struct wpa_scan_results *res)
1872 {
1873         size_t i, j;
1874
1875         if (wpa_s->bssid_filter == NULL)
1876                 return;
1877
1878         for (i = 0, j = 0; i < res->num; i++) {
1879                 if (wpa_supplicant_filter_bssid_match(wpa_s,
1880                                                       res->res[i]->bssid)) {
1881                         res->res[j++] = res->res[i];
1882                 } else {
1883                         os_free(res->res[i]);
1884                         res->res[i] = NULL;
1885                 }
1886         }
1887
1888         if (res->num != j) {
1889                 wpa_printf(MSG_DEBUG, "Filtered out %d scan results",
1890                            (int) (res->num - j));
1891                 res->num = j;
1892         }
1893 }
1894
1895
1896 /*
1897  * Noise floor values to use when we have signal strength
1898  * measurements, but no noise floor measurements. These values were
1899  * measured in an office environment with many APs.
1900  */
1901 #define DEFAULT_NOISE_FLOOR_2GHZ (-89)
1902 #define DEFAULT_NOISE_FLOOR_5GHZ (-92)
1903
1904 static void scan_snr(struct wpa_scan_res *res)
1905 {
1906         if (res->flags & WPA_SCAN_NOISE_INVALID) {
1907                 res->noise = IS_5GHZ(res->freq) ?
1908                         DEFAULT_NOISE_FLOOR_5GHZ :
1909                         DEFAULT_NOISE_FLOOR_2GHZ;
1910         }
1911
1912         if (res->flags & WPA_SCAN_LEVEL_DBM) {
1913                 res->snr = res->level - res->noise;
1914         } else {
1915                 /* Level is not in dBm, so we can't calculate
1916                  * SNR. Just use raw level (units unknown). */
1917                 res->snr = res->level;
1918         }
1919 }
1920
1921
1922 static unsigned int max_ht20_rate(int snr)
1923 {
1924         if (snr < 6)
1925                 return 6500; /* HT20 MCS0 */
1926         if (snr < 8)
1927                 return 13000; /* HT20 MCS1 */
1928         if (snr < 13)
1929                 return 19500; /* HT20 MCS2 */
1930         if (snr < 17)
1931                 return 26000; /* HT20 MCS3 */
1932         if (snr < 20)
1933                 return 39000; /* HT20 MCS4 */
1934         if (snr < 23)
1935                 return 52000; /* HT20 MCS5 */
1936         if (snr < 24)
1937                 return 58500; /* HT20 MCS6 */
1938         return 65000; /* HT20 MCS7 */
1939 }
1940
1941
1942 static unsigned int max_ht40_rate(int snr)
1943 {
1944         if (snr < 3)
1945                 return 13500; /* HT40 MCS0 */
1946         if (snr < 6)
1947                 return 27000; /* HT40 MCS1 */
1948         if (snr < 10)
1949                 return 40500; /* HT40 MCS2 */
1950         if (snr < 15)
1951                 return 54000; /* HT40 MCS3 */
1952         if (snr < 17)
1953                 return 81000; /* HT40 MCS4 */
1954         if (snr < 22)
1955                 return 108000; /* HT40 MCS5 */
1956         if (snr < 24)
1957                 return 121500; /* HT40 MCS6 */
1958         return 135000; /* HT40 MCS7 */
1959 }
1960
1961
1962 static unsigned int max_vht80_rate(int snr)
1963 {
1964         if (snr < 1)
1965                 return 0;
1966         if (snr < 2)
1967                 return 29300; /* VHT80 MCS0 */
1968         if (snr < 5)
1969                 return 58500; /* VHT80 MCS1 */
1970         if (snr < 9)
1971                 return 87800; /* VHT80 MCS2 */
1972         if (snr < 11)
1973                 return 117000; /* VHT80 MCS3 */
1974         if (snr < 15)
1975                 return 175500; /* VHT80 MCS4 */
1976         if (snr < 16)
1977                 return 234000; /* VHT80 MCS5 */
1978         if (snr < 18)
1979                 return 263300; /* VHT80 MCS6 */
1980         if (snr < 20)
1981                 return 292500; /* VHT80 MCS7 */
1982         if (snr < 22)
1983                 return 351000; /* VHT80 MCS8 */
1984         return 390000; /* VHT80 MCS9 */
1985 }
1986
1987
1988 static void scan_est_throughput(struct wpa_supplicant *wpa_s,
1989                                 struct wpa_scan_res *res)
1990 {
1991         enum local_hw_capab capab = wpa_s->hw_capab;
1992         int rate; /* max legacy rate in 500 kb/s units */
1993         const u8 *ie;
1994         unsigned int est, tmp;
1995         int snr = res->snr;
1996
1997         if (res->est_throughput)
1998                 return;
1999
2000         /* Get maximum legacy rate */
2001         rate = wpa_scan_get_max_rate(res);
2002
2003         /* Limit based on estimated SNR */
2004         if (rate > 1 * 2 && snr < 1)
2005                 rate = 1 * 2;
2006         else if (rate > 2 * 2 && snr < 4)
2007                 rate = 2 * 2;
2008         else if (rate > 6 * 2 && snr < 5)
2009                 rate = 6 * 2;
2010         else if (rate > 9 * 2 && snr < 6)
2011                 rate = 9 * 2;
2012         else if (rate > 12 * 2 && snr < 7)
2013                 rate = 12 * 2;
2014         else if (rate > 18 * 2 && snr < 10)
2015                 rate = 18 * 2;
2016         else if (rate > 24 * 2 && snr < 11)
2017                 rate = 24 * 2;
2018         else if (rate > 36 * 2 && snr < 15)
2019                 rate = 36 * 2;
2020         else if (rate > 48 * 2 && snr < 19)
2021                 rate = 48 * 2;
2022         else if (rate > 54 * 2 && snr < 21)
2023                 rate = 54 * 2;
2024         est = rate * 500;
2025
2026         if (capab == CAPAB_HT || capab == CAPAB_HT40 || capab == CAPAB_VHT) {
2027                 ie = wpa_scan_get_ie(res, WLAN_EID_HT_CAP);
2028                 if (ie) {
2029                         tmp = max_ht20_rate(snr);
2030                         if (tmp > est)
2031                                 est = tmp;
2032                 }
2033         }
2034
2035         if (capab == CAPAB_HT40 || capab == CAPAB_VHT) {
2036                 ie = wpa_scan_get_ie(res, WLAN_EID_HT_OPERATION);
2037                 if (ie && ie[1] >= 2 &&
2038                     (ie[3] & HT_INFO_HT_PARAM_SECONDARY_CHNL_OFF_MASK)) {
2039                         tmp = max_ht40_rate(snr);
2040                         if (tmp > est)
2041                                 est = tmp;
2042                 }
2043         }
2044
2045         if (capab == CAPAB_VHT) {
2046                 /* Use +1 to assume VHT is always faster than HT */
2047                 ie = wpa_scan_get_ie(res, WLAN_EID_VHT_CAP);
2048                 if (ie) {
2049                         tmp = max_ht20_rate(snr) + 1;
2050                         if (tmp > est)
2051                                 est = tmp;
2052
2053                         ie = wpa_scan_get_ie(res, WLAN_EID_HT_OPERATION);
2054                         if (ie && ie[1] >= 2 &&
2055                             (ie[3] &
2056                              HT_INFO_HT_PARAM_SECONDARY_CHNL_OFF_MASK)) {
2057                                 tmp = max_ht40_rate(snr) + 1;
2058                                 if (tmp > est)
2059                                         est = tmp;
2060                         }
2061
2062                         ie = wpa_scan_get_ie(res, WLAN_EID_VHT_OPERATION);
2063                         if (ie && ie[1] >= 1 &&
2064                             (ie[2] & VHT_OPMODE_CHANNEL_WIDTH_MASK)) {
2065                                 tmp = max_vht80_rate(snr) + 1;
2066                                 if (tmp > est)
2067                                         est = tmp;
2068                         }
2069                 }
2070         }
2071
2072         /* TODO: channel utilization and AP load (e.g., from AP Beacon) */
2073
2074         res->est_throughput = est;
2075 }
2076
2077
2078 /**
2079  * wpa_supplicant_get_scan_results - Get scan results
2080  * @wpa_s: Pointer to wpa_supplicant data
2081  * @info: Information about what was scanned or %NULL if not available
2082  * @new_scan: Whether a new scan was performed
2083  * Returns: Scan results, %NULL on failure
2084  *
2085  * This function request the current scan results from the driver and updates
2086  * the local BSS list wpa_s->bss. The caller is responsible for freeing the
2087  * results with wpa_scan_results_free().
2088  */
2089 struct wpa_scan_results *
2090 wpa_supplicant_get_scan_results(struct wpa_supplicant *wpa_s,
2091                                 struct scan_info *info, int new_scan)
2092 {
2093         struct wpa_scan_results *scan_res;
2094         size_t i;
2095         int (*compar)(const void *, const void *) = wpa_scan_result_compar;
2096
2097         scan_res = wpa_drv_get_scan_results2(wpa_s);
2098         if (scan_res == NULL) {
2099                 wpa_dbg(wpa_s, MSG_DEBUG, "Failed to get scan results");
2100                 return NULL;
2101         }
2102         if (scan_res->fetch_time.sec == 0) {
2103                 /*
2104                  * Make sure we have a valid timestamp if the driver wrapper
2105                  * does not set this.
2106                  */
2107                 os_get_reltime(&scan_res->fetch_time);
2108         }
2109         filter_scan_res(wpa_s, scan_res);
2110
2111         for (i = 0; i < scan_res->num; i++) {
2112                 struct wpa_scan_res *scan_res_item = scan_res->res[i];
2113
2114                 scan_snr(scan_res_item);
2115                 scan_est_throughput(wpa_s, scan_res_item);
2116         }
2117
2118 #ifdef CONFIG_WPS
2119         if (wpas_wps_searching(wpa_s)) {
2120                 wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Order scan results with WPS "
2121                         "provisioning rules");
2122                 compar = wpa_scan_result_wps_compar;
2123         }
2124 #endif /* CONFIG_WPS */
2125
2126         qsort(scan_res->res, scan_res->num, sizeof(struct wpa_scan_res *),
2127               compar);
2128         dump_scan_res(scan_res);
2129
2130         wpa_bss_update_start(wpa_s);
2131         for (i = 0; i < scan_res->num; i++)
2132                 wpa_bss_update_scan_res(wpa_s, scan_res->res[i],
2133                                         &scan_res->fetch_time);
2134         wpa_bss_update_end(wpa_s, info, new_scan);
2135
2136         return scan_res;
2137 }
2138
2139
2140 /**
2141  * wpa_supplicant_update_scan_results - Update scan results from the driver
2142  * @wpa_s: Pointer to wpa_supplicant data
2143  * Returns: 0 on success, -1 on failure
2144  *
2145  * This function updates the BSS table within wpa_supplicant based on the
2146  * currently available scan results from the driver without requesting a new
2147  * scan. This is used in cases where the driver indicates an association
2148  * (including roaming within ESS) and wpa_supplicant does not yet have the
2149  * needed information to complete the connection (e.g., to perform validation
2150  * steps in 4-way handshake).
2151  */
2152 int wpa_supplicant_update_scan_results(struct wpa_supplicant *wpa_s)
2153 {
2154         struct wpa_scan_results *scan_res;
2155         scan_res = wpa_supplicant_get_scan_results(wpa_s, NULL, 0);
2156         if (scan_res == NULL)
2157                 return -1;
2158         wpa_scan_results_free(scan_res);
2159
2160         return 0;
2161 }
2162
2163
2164 /**
2165  * scan_only_handler - Reports scan results
2166  */
2167 void scan_only_handler(struct wpa_supplicant *wpa_s,
2168                        struct wpa_scan_results *scan_res)
2169 {
2170         wpa_dbg(wpa_s, MSG_DEBUG, "Scan-only results received");
2171         if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
2172             wpa_s->manual_scan_use_id && wpa_s->own_scan_running) {
2173                 wpa_msg_ctrl(wpa_s, MSG_INFO, WPA_EVENT_SCAN_RESULTS "id=%u",
2174                              wpa_s->manual_scan_id);
2175                 wpa_s->manual_scan_use_id = 0;
2176         } else {
2177                 wpa_msg_ctrl(wpa_s, MSG_INFO, WPA_EVENT_SCAN_RESULTS);
2178         }
2179         wpas_notify_scan_results(wpa_s);
2180         wpas_notify_scan_done(wpa_s, 1);
2181         if (wpa_s->scan_work) {
2182                 struct wpa_radio_work *work = wpa_s->scan_work;
2183                 wpa_s->scan_work = NULL;
2184                 radio_work_done(work);
2185         }
2186
2187         if (wpa_s->wpa_state == WPA_SCANNING)
2188                 wpa_supplicant_set_state(wpa_s, wpa_s->scan_prev_wpa_state);
2189 }
2190
2191
2192 int wpas_scan_scheduled(struct wpa_supplicant *wpa_s)
2193 {
2194         return eloop_is_timeout_registered(wpa_supplicant_scan, wpa_s, NULL);
2195 }
2196
2197
2198 struct wpa_driver_scan_params *
2199 wpa_scan_clone_params(const struct wpa_driver_scan_params *src)
2200 {
2201         struct wpa_driver_scan_params *params;
2202         size_t i;
2203         u8 *n;
2204
2205         params = os_zalloc(sizeof(*params));
2206         if (params == NULL)
2207                 return NULL;
2208
2209         for (i = 0; i < src->num_ssids; i++) {
2210                 if (src->ssids[i].ssid) {
2211                         n = os_malloc(src->ssids[i].ssid_len);
2212                         if (n == NULL)
2213                                 goto failed;
2214                         os_memcpy(n, src->ssids[i].ssid,
2215                                   src->ssids[i].ssid_len);
2216                         params->ssids[i].ssid = n;
2217                         params->ssids[i].ssid_len = src->ssids[i].ssid_len;
2218                 }
2219         }
2220         params->num_ssids = src->num_ssids;
2221
2222         if (src->extra_ies) {
2223                 n = os_malloc(src->extra_ies_len);
2224                 if (n == NULL)
2225                         goto failed;
2226                 os_memcpy(n, src->extra_ies, src->extra_ies_len);
2227                 params->extra_ies = n;
2228                 params->extra_ies_len = src->extra_ies_len;
2229         }
2230
2231         if (src->freqs) {
2232                 int len = int_array_len(src->freqs);
2233                 params->freqs = os_malloc((len + 1) * sizeof(int));
2234                 if (params->freqs == NULL)
2235                         goto failed;
2236                 os_memcpy(params->freqs, src->freqs, (len + 1) * sizeof(int));
2237         }
2238
2239         if (src->filter_ssids) {
2240                 params->filter_ssids = os_malloc(sizeof(*params->filter_ssids) *
2241                                                  src->num_filter_ssids);
2242                 if (params->filter_ssids == NULL)
2243                         goto failed;
2244                 os_memcpy(params->filter_ssids, src->filter_ssids,
2245                           sizeof(*params->filter_ssids) *
2246                           src->num_filter_ssids);
2247                 params->num_filter_ssids = src->num_filter_ssids;
2248         }
2249
2250         params->filter_rssi = src->filter_rssi;
2251         params->p2p_probe = src->p2p_probe;
2252         params->only_new_results = src->only_new_results;
2253         params->low_priority = src->low_priority;
2254
2255         if (src->sched_scan_plans_num > 0) {
2256                 params->sched_scan_plans =
2257                         os_malloc(sizeof(*src->sched_scan_plans) *
2258                                   src->sched_scan_plans_num);
2259                 if (!params->sched_scan_plans)
2260                         goto failed;
2261
2262                 os_memcpy(params->sched_scan_plans, src->sched_scan_plans,
2263                           sizeof(*src->sched_scan_plans) *
2264                           src->sched_scan_plans_num);
2265                 params->sched_scan_plans_num = src->sched_scan_plans_num;
2266         }
2267
2268         if (src->mac_addr_rand) {
2269                 params->mac_addr_rand = src->mac_addr_rand;
2270
2271                 if (src->mac_addr && src->mac_addr_mask) {
2272                         u8 *mac_addr;
2273
2274                         mac_addr = os_malloc(2 * ETH_ALEN);
2275                         if (!mac_addr)
2276                                 goto failed;
2277
2278                         os_memcpy(mac_addr, src->mac_addr, ETH_ALEN);
2279                         os_memcpy(mac_addr + ETH_ALEN, src->mac_addr_mask,
2280                                   ETH_ALEN);
2281                         params->mac_addr = mac_addr;
2282                         params->mac_addr_mask = mac_addr + ETH_ALEN;
2283                 }
2284         }
2285
2286         if (src->bssid) {
2287                 u8 *bssid;
2288
2289                 bssid = os_malloc(ETH_ALEN);
2290                 if (!bssid)
2291                         goto failed;
2292                 os_memcpy(bssid, src->bssid, ETH_ALEN);
2293                 params->bssid = bssid;
2294         }
2295
2296         return params;
2297
2298 failed:
2299         wpa_scan_free_params(params);
2300         return NULL;
2301 }
2302
2303
2304 void wpa_scan_free_params(struct wpa_driver_scan_params *params)
2305 {
2306         size_t i;
2307
2308         if (params == NULL)
2309                 return;
2310
2311         for (i = 0; i < params->num_ssids; i++)
2312                 os_free((u8 *) params->ssids[i].ssid);
2313         os_free((u8 *) params->extra_ies);
2314         os_free(params->freqs);
2315         os_free(params->filter_ssids);
2316         os_free(params->sched_scan_plans);
2317
2318         /*
2319          * Note: params->mac_addr_mask points to same memory allocation and
2320          * must not be freed separately.
2321          */
2322         os_free((u8 *) params->mac_addr);
2323
2324         os_free((u8 *) params->bssid);
2325
2326         os_free(params);
2327 }
2328
2329
2330 int wpas_start_pno(struct wpa_supplicant *wpa_s)
2331 {
2332         int ret, prio;
2333         size_t i, num_ssid, num_match_ssid;
2334         struct wpa_ssid *ssid;
2335         struct wpa_driver_scan_params params;
2336         struct sched_scan_plan scan_plan;
2337
2338         if (!wpa_s->sched_scan_supported)
2339                 return -1;
2340
2341         if (wpa_s->pno || wpa_s->pno_sched_pending)
2342                 return 0;
2343
2344         if ((wpa_s->wpa_state > WPA_SCANNING) &&
2345             (wpa_s->wpa_state <= WPA_COMPLETED)) {
2346                 wpa_printf(MSG_ERROR, "PNO: In assoc process");
2347                 return -EAGAIN;
2348         }
2349
2350         if (wpa_s->wpa_state == WPA_SCANNING) {
2351                 wpa_supplicant_cancel_scan(wpa_s);
2352                 if (wpa_s->sched_scanning) {
2353                         wpa_printf(MSG_DEBUG, "Schedule PNO on completion of "
2354                                    "ongoing sched scan");
2355                         wpa_supplicant_cancel_sched_scan(wpa_s);
2356                         wpa_s->pno_sched_pending = 1;
2357                         return 0;
2358                 }
2359         }
2360
2361         os_memset(&params, 0, sizeof(params));
2362
2363         num_ssid = num_match_ssid = 0;
2364         ssid = wpa_s->conf->ssid;
2365         while (ssid) {
2366                 if (!wpas_network_disabled(wpa_s, ssid)) {
2367                         num_match_ssid++;
2368                         if (ssid->scan_ssid)
2369                                 num_ssid++;
2370                 }
2371                 ssid = ssid->next;
2372         }
2373
2374         if (num_match_ssid == 0) {
2375                 wpa_printf(MSG_DEBUG, "PNO: No configured SSIDs");
2376                 return -1;
2377         }
2378
2379         if (num_match_ssid > num_ssid) {
2380                 params.num_ssids++; /* wildcard */
2381                 num_ssid++;
2382         }
2383
2384         if (num_ssid > WPAS_MAX_SCAN_SSIDS) {
2385                 wpa_printf(MSG_DEBUG, "PNO: Use only the first %u SSIDs from "
2386                            "%u", WPAS_MAX_SCAN_SSIDS, (unsigned int) num_ssid);
2387                 num_ssid = WPAS_MAX_SCAN_SSIDS;
2388         }
2389
2390         if (num_match_ssid > wpa_s->max_match_sets) {
2391                 num_match_ssid = wpa_s->max_match_sets;
2392                 wpa_dbg(wpa_s, MSG_DEBUG, "PNO: Too many SSIDs to match");
2393         }
2394         params.filter_ssids = os_calloc(num_match_ssid,
2395                                         sizeof(struct wpa_driver_scan_filter));
2396         if (params.filter_ssids == NULL)
2397                 return -1;
2398
2399         i = 0;
2400         prio = 0;
2401         ssid = wpa_s->conf->pssid[prio];
2402         while (ssid) {
2403                 if (!wpas_network_disabled(wpa_s, ssid)) {
2404                         if (ssid->scan_ssid && params.num_ssids < num_ssid) {
2405                                 params.ssids[params.num_ssids].ssid =
2406                                         ssid->ssid;
2407                                 params.ssids[params.num_ssids].ssid_len =
2408                                          ssid->ssid_len;
2409                                 params.num_ssids++;
2410                         }
2411                         os_memcpy(params.filter_ssids[i].ssid, ssid->ssid,
2412                                   ssid->ssid_len);
2413                         params.filter_ssids[i].ssid_len = ssid->ssid_len;
2414                         params.num_filter_ssids++;
2415                         i++;
2416                         if (i == num_match_ssid)
2417                                 break;
2418                 }
2419                 if (ssid->pnext)
2420                         ssid = ssid->pnext;
2421                 else if (prio + 1 == wpa_s->conf->num_prio)
2422                         break;
2423                 else
2424                         ssid = wpa_s->conf->pssid[++prio];
2425         }
2426
2427         if (wpa_s->conf->filter_rssi)
2428                 params.filter_rssi = wpa_s->conf->filter_rssi;
2429
2430         if (wpa_s->sched_scan_plans_num) {
2431                 params.sched_scan_plans = wpa_s->sched_scan_plans;
2432                 params.sched_scan_plans_num = wpa_s->sched_scan_plans_num;
2433         } else {
2434                 /* Set one scan plan that will run infinitely */
2435                 if (wpa_s->conf->sched_scan_interval)
2436                         scan_plan.interval = wpa_s->conf->sched_scan_interval;
2437                 else
2438                         scan_plan.interval = 10;
2439
2440                 scan_plan.iterations = 0;
2441                 params.sched_scan_plans = &scan_plan;
2442                 params.sched_scan_plans_num = 1;
2443         }
2444
2445         if (params.freqs == NULL && wpa_s->manual_sched_scan_freqs) {
2446                 wpa_dbg(wpa_s, MSG_DEBUG, "Limit sched scan to specified channels");
2447                 params.freqs = wpa_s->manual_sched_scan_freqs;
2448         }
2449
2450         if (wpa_s->mac_addr_rand_enable & MAC_ADDR_RAND_PNO) {
2451                 params.mac_addr_rand = 1;
2452                 if (wpa_s->mac_addr_pno) {
2453                         params.mac_addr = wpa_s->mac_addr_pno;
2454                         params.mac_addr_mask = wpa_s->mac_addr_pno + ETH_ALEN;
2455                 }
2456         }
2457
2458         ret = wpa_supplicant_start_sched_scan(wpa_s, &params);
2459         os_free(params.filter_ssids);
2460         if (ret == 0)
2461                 wpa_s->pno = 1;
2462         else
2463                 wpa_msg(wpa_s, MSG_ERROR, "Failed to schedule PNO");
2464         return ret;
2465 }
2466
2467
2468 int wpas_stop_pno(struct wpa_supplicant *wpa_s)
2469 {
2470         int ret = 0;
2471
2472         if (!wpa_s->pno)
2473                 return 0;
2474
2475         ret = wpa_supplicant_stop_sched_scan(wpa_s);
2476
2477         wpa_s->pno = 0;
2478         wpa_s->pno_sched_pending = 0;
2479
2480         if (wpa_s->wpa_state == WPA_SCANNING)
2481                 wpa_supplicant_req_scan(wpa_s, 0, 0);
2482
2483         return ret;
2484 }
2485
2486
2487 void wpas_mac_addr_rand_scan_clear(struct wpa_supplicant *wpa_s,
2488                                     unsigned int type)
2489 {
2490         type &= MAC_ADDR_RAND_ALL;
2491         wpa_s->mac_addr_rand_enable &= ~type;
2492
2493         if (type & MAC_ADDR_RAND_SCAN) {
2494                 os_free(wpa_s->mac_addr_scan);
2495                 wpa_s->mac_addr_scan = NULL;
2496         }
2497
2498         if (type & MAC_ADDR_RAND_SCHED_SCAN) {
2499                 os_free(wpa_s->mac_addr_sched_scan);
2500                 wpa_s->mac_addr_sched_scan = NULL;
2501         }
2502
2503         if (type & MAC_ADDR_RAND_PNO) {
2504                 os_free(wpa_s->mac_addr_pno);
2505                 wpa_s->mac_addr_pno = NULL;
2506         }
2507 }
2508
2509
2510 int wpas_mac_addr_rand_scan_set(struct wpa_supplicant *wpa_s,
2511                                 unsigned int type, const u8 *addr,
2512                                 const u8 *mask)
2513 {
2514         u8 *tmp = NULL;
2515
2516         wpas_mac_addr_rand_scan_clear(wpa_s, type);
2517
2518         if (addr) {
2519                 tmp = os_malloc(2 * ETH_ALEN);
2520                 if (!tmp)
2521                         return -1;
2522                 os_memcpy(tmp, addr, ETH_ALEN);
2523                 os_memcpy(tmp + ETH_ALEN, mask, ETH_ALEN);
2524         }
2525
2526         if (type == MAC_ADDR_RAND_SCAN) {
2527                 wpa_s->mac_addr_scan = tmp;
2528         } else if (type == MAC_ADDR_RAND_SCHED_SCAN) {
2529                 wpa_s->mac_addr_sched_scan = tmp;
2530         } else if (type == MAC_ADDR_RAND_PNO) {
2531                 wpa_s->mac_addr_pno = tmp;
2532         } else {
2533                 wpa_printf(MSG_INFO,
2534                            "scan: Invalid MAC randomization type=0x%x",
2535                            type);
2536                 os_free(tmp);
2537                 return -1;
2538         }
2539
2540         wpa_s->mac_addr_rand_enable |= type;
2541         return 0;
2542 }
2543
2544
2545 int wpas_abort_ongoing_scan(struct wpa_supplicant *wpa_s)
2546 {
2547         int scan_work = !!wpa_s->scan_work;
2548
2549 #ifdef CONFIG_P2P
2550         scan_work |= !!wpa_s->p2p_scan_work;
2551 #endif /* CONFIG_P2P */
2552
2553         if (scan_work && wpa_s->own_scan_running) {
2554                 wpa_dbg(wpa_s, MSG_DEBUG, "Abort an ongoing scan");
2555                 return wpa_drv_abort_scan(wpa_s);
2556         }
2557
2558         return 0;
2559 }
2560
2561
2562 int wpas_sched_scan_plans_set(struct wpa_supplicant *wpa_s, const char *cmd)
2563 {
2564         struct sched_scan_plan *scan_plans = NULL;
2565         const char *token, *context = NULL;
2566         unsigned int num = 0;
2567
2568         if (!cmd)
2569                 return -1;
2570
2571         if (!cmd[0]) {
2572                 wpa_printf(MSG_DEBUG, "Clear sched scan plans");
2573                 os_free(wpa_s->sched_scan_plans);
2574                 wpa_s->sched_scan_plans = NULL;
2575                 wpa_s->sched_scan_plans_num = 0;
2576                 return 0;
2577         }
2578
2579         while ((token = cstr_token(cmd, " ", &context))) {
2580                 int ret;
2581                 struct sched_scan_plan *scan_plan, *n;
2582
2583                 n = os_realloc_array(scan_plans, num + 1, sizeof(*scan_plans));
2584                 if (!n)
2585                         goto fail;
2586
2587                 scan_plans = n;
2588                 scan_plan = &scan_plans[num];
2589                 num++;
2590
2591                 ret = sscanf(token, "%u:%u", &scan_plan->interval,
2592                              &scan_plan->iterations);
2593                 if (ret <= 0 || ret > 2 || !scan_plan->interval) {
2594                         wpa_printf(MSG_ERROR,
2595                                    "Invalid sched scan plan input: %s", token);
2596                         goto fail;
2597                 }
2598
2599                 if (!scan_plan->interval) {
2600                         wpa_printf(MSG_ERROR,
2601                                    "scan plan %u: Interval cannot be zero",
2602                                    num);
2603                         goto fail;
2604                 }
2605
2606                 if (scan_plan->interval > wpa_s->max_sched_scan_plan_interval) {
2607                         wpa_printf(MSG_WARNING,
2608                                    "scan plan %u: Scan interval too long(%u), use the maximum allowed(%u)",
2609                                    num, scan_plan->interval,
2610                                    wpa_s->max_sched_scan_plan_interval);
2611                         scan_plan->interval =
2612                                 wpa_s->max_sched_scan_plan_interval;
2613                 }
2614
2615                 if (ret == 1) {
2616                         scan_plan->iterations = 0;
2617                         break;
2618                 }
2619
2620                 if (!scan_plan->iterations) {
2621                         wpa_printf(MSG_ERROR,
2622                                    "scan plan %u: Number of iterations cannot be zero",
2623                                    num);
2624                         goto fail;
2625                 }
2626
2627                 if (scan_plan->iterations >
2628                     wpa_s->max_sched_scan_plan_iterations) {
2629                         wpa_printf(MSG_WARNING,
2630                                    "scan plan %u: Too many iterations(%u), use the maximum allowed(%u)",
2631                                    num, scan_plan->iterations,
2632                                    wpa_s->max_sched_scan_plan_iterations);
2633                         scan_plan->iterations =
2634                                 wpa_s->max_sched_scan_plan_iterations;
2635                 }
2636
2637                 wpa_printf(MSG_DEBUG,
2638                            "scan plan %u: interval=%u iterations=%u",
2639                            num, scan_plan->interval, scan_plan->iterations);
2640         }
2641
2642         if (!scan_plans) {
2643                 wpa_printf(MSG_ERROR, "Invalid scan plans entry");
2644                 goto fail;
2645         }
2646
2647         if (cstr_token(cmd, " ", &context) || scan_plans[num - 1].iterations) {
2648                 wpa_printf(MSG_ERROR,
2649                            "All scan plans but the last must specify a number of iterations");
2650                 goto fail;
2651         }
2652
2653         wpa_printf(MSG_DEBUG, "scan plan %u (last plan): interval=%u",
2654                    num, scan_plans[num - 1].interval);
2655
2656         if (num > wpa_s->max_sched_scan_plans) {
2657                 wpa_printf(MSG_WARNING,
2658                            "Too many scheduled scan plans (only %u supported)",
2659                            wpa_s->max_sched_scan_plans);
2660                 wpa_printf(MSG_WARNING,
2661                            "Use only the first %u scan plans, and the last one (in infinite loop)",
2662                            wpa_s->max_sched_scan_plans - 1);
2663                 os_memcpy(&scan_plans[wpa_s->max_sched_scan_plans - 1],
2664                           &scan_plans[num - 1], sizeof(*scan_plans));
2665                 num = wpa_s->max_sched_scan_plans;
2666         }
2667
2668         os_free(wpa_s->sched_scan_plans);
2669         wpa_s->sched_scan_plans = scan_plans;
2670         wpa_s->sched_scan_plans_num = num;
2671
2672         return 0;
2673
2674 fail:
2675         os_free(scan_plans);
2676         wpa_printf(MSG_ERROR, "invalid scan plans list");
2677         return -1;
2678 }