contrib/wpa/wpa_supplicant/scan.c

   1 /*
   2  * WPA Supplicant - Scanning
   3  * Copyright (c) 2003-2019, 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                 wpas_notify_network_changed(wpa_s);
  40         }
  41         wpa_supplicant_initiate_eapol(wpa_s);
  42         wpa_dbg(wpa_s, MSG_DEBUG, "Already associated with a configured "
  43                 "network - generating associated event");
  44         os_memset(&data, 0, sizeof(data));
  45         wpa_supplicant_event(wpa_s, EVENT_ASSOC, &data);
  46 }
  47
  48
  49 #ifdef CONFIG_WPS
  50 static int wpas_wps_in_use(struct wpa_supplicant *wpa_s,
  51                            enum wps_request_type *req_type)
  52 {
  53         struct wpa_ssid *ssid;
  54         int wps = 0;
  55
  56         for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
  57                 if (!(ssid->key_mgmt & WPA_KEY_MGMT_WPS))
  58                         continue;
  59
  60                 wps = 1;
  61                 *req_type = wpas_wps_get_req_type(ssid);
  62                 if (ssid->eap.phase1 && os_strstr(ssid->eap.phase1, "pbc=1"))
  63                         return 2;
  64         }
  65
  66 #ifdef CONFIG_P2P
  67         if (!wpa_s->global->p2p_disabled && wpa_s->global->p2p &&
  68             !wpa_s->conf->p2p_disabled) {
  69                 wpa_s->wps->dev.p2p = 1;
  70                 if (!wps) {
  71                         wps = 1;
  72                         *req_type = WPS_REQ_ENROLLEE_INFO;
  73                 }
  74         }
  75 #endif /* CONFIG_P2P */
  76
  77         return wps;
  78 }
  79 #endif /* CONFIG_WPS */
  80
  81
  82 /**
  83  * wpa_supplicant_enabled_networks - Check whether there are enabled networks
  84  * @wpa_s: Pointer to wpa_supplicant data
  85  * Returns: 0 if no networks are enabled, >0 if networks are enabled
  86  *
  87  * This function is used to figure out whether any networks (or Interworking
  88  * with enabled credentials and auto_interworking) are present in the current
  89  * configuration.
  90  */
  91 int wpa_supplicant_enabled_networks(struct wpa_supplicant *wpa_s)
  92 {
  93         struct wpa_ssid *ssid = wpa_s->conf->ssid;
  94         int count = 0, disabled = 0;
  95
  96         if (wpa_s->p2p_mgmt)
  97                 return 0; /* no normal network profiles on p2p_mgmt interface */
  98
  99         while (ssid) {
 100                 if (!wpas_network_disabled(wpa_s, ssid))
 101                         count++;
 102                 else
 103                         disabled++;
 104                 ssid = ssid->next;
 105         }
 106         if (wpa_s->conf->cred && wpa_s->conf->interworking &&
 107             wpa_s->conf->auto_interworking)
 108                 count++;
 109         if (count == 0 && disabled > 0) {
 110                 wpa_dbg(wpa_s, MSG_DEBUG, "No enabled networks (%d disabled "
 111                         "networks)", disabled);
 112         }
 113         return count;
 114 }
 115
 116
 117 static void wpa_supplicant_assoc_try(struct wpa_supplicant *wpa_s,
 118                                      struct wpa_ssid *ssid)
 119 {
 120         int min_temp_disabled = 0;
 121
 122         while (ssid) {
 123                 if (!wpas_network_disabled(wpa_s, ssid)) {
 124                         int temp_disabled = wpas_temp_disabled(wpa_s, ssid);
 125
 126                         if (temp_disabled <= 0)
 127                                 break;
 128
 129                         if (!min_temp_disabled ||
 130                             temp_disabled < min_temp_disabled)
 131                                 min_temp_disabled = temp_disabled;
 132                 }
 133                 ssid = ssid->next;
 134         }
 135
 136         /* ap_scan=2 mode - try to associate with each SSID. */
 137         if (ssid == NULL) {
 138                 wpa_dbg(wpa_s, MSG_DEBUG, "wpa_supplicant_assoc_try: Reached "
 139                         "end of scan list - go back to beginning");
 140                 wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
 141                 wpa_supplicant_req_scan(wpa_s, min_temp_disabled, 0);
 142                 return;
 143         }
 144         if (ssid->next) {
 145                 /* Continue from the next SSID on the next attempt. */
 146                 wpa_s->prev_scan_ssid = ssid;
 147         } else {
 148                 /* Start from the beginning of the SSID list. */
 149                 wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
 150         }
 151         wpa_supplicant_associate(wpa_s, NULL, ssid);
 152 }
 153
 154
 155 static void wpas_trigger_scan_cb(struct wpa_radio_work *work, int deinit)
 156 {
 157         struct wpa_supplicant *wpa_s = work->wpa_s;
 158         struct wpa_driver_scan_params *params = work->ctx;
 159         int ret;
 160
 161         if (deinit) {
 162                 if (!work->started) {
 163                         wpa_scan_free_params(params);
 164                         return;
 165                 }
 166                 wpa_supplicant_notify_scanning(wpa_s, 0);
 167                 wpas_notify_scan_done(wpa_s, 0);
 168                 wpa_s->scan_work = NULL;
 169                 return;
 170         }
 171
 172         if (wpas_update_random_addr_disassoc(wpa_s) < 0) {
 173                 wpa_msg(wpa_s, MSG_INFO,
 174                         "Failed to assign random MAC address for a scan");
 175                 wpa_scan_free_params(params);
 176                 wpa_msg(wpa_s, MSG_INFO, WPA_EVENT_SCAN_FAILED "ret=-1");
 177                 radio_work_done(work);
 178                 return;
 179         }
 180
 181         wpa_supplicant_notify_scanning(wpa_s, 1);
 182
 183         if (wpa_s->clear_driver_scan_cache) {
 184                 wpa_printf(MSG_DEBUG,
 185                            "Request driver to clear scan cache due to local BSS flush");
 186                 params->only_new_results = 1;
 187         }
 188         ret = wpa_drv_scan(wpa_s, params);
 189         /*
 190          * Store the obtained vendor scan cookie (if any) in wpa_s context.
 191          * The current design is to allow only one scan request on each
 192          * interface, hence having this scan cookie stored in wpa_s context is
 193          * fine for now.
 194          *
 195          * Revisit this logic if concurrent scan operations per interface
 196          * is supported.
 197          */
 198         if (ret == 0)
 199                 wpa_s->curr_scan_cookie = params->scan_cookie;
 200         wpa_scan_free_params(params);
 201         work->ctx = NULL;
 202         if (ret) {
 203                 int retry = wpa_s->last_scan_req != MANUAL_SCAN_REQ &&
 204                         !wpa_s->beacon_rep_data.token;
 205
 206                 if (wpa_s->disconnected)
 207                         retry = 0;
 208
 209                 wpa_supplicant_notify_scanning(wpa_s, 0);
 210                 wpas_notify_scan_done(wpa_s, 0);
 211                 if (wpa_s->wpa_state == WPA_SCANNING)
 212                         wpa_supplicant_set_state(wpa_s,
 213                                                  wpa_s->scan_prev_wpa_state);
 214                 wpa_msg(wpa_s, MSG_INFO, WPA_EVENT_SCAN_FAILED "ret=%d%s",
 215                         ret, retry ? " retry=1" : "");
 216                 radio_work_done(work);
 217
 218                 if (retry) {
 219                         /* Restore scan_req since we will try to scan again */
 220                         wpa_s->scan_req = wpa_s->last_scan_req;
 221                         wpa_supplicant_req_scan(wpa_s, 1, 0);
 222                 } else if (wpa_s->scan_res_handler) {
 223                         /* Clear the scan_res_handler */
 224                         wpa_s->scan_res_handler = NULL;
 225                 }
 226
 227                 if (wpa_s->beacon_rep_data.token)
 228                         wpas_rrm_refuse_request(wpa_s);
 229
 230                 return;
 231         }
 232
 233         os_get_reltime(&wpa_s->scan_trigger_time);
 234         wpa_s->scan_runs++;
 235         wpa_s->normal_scans++;
 236         wpa_s->own_scan_requested = 1;
 237         wpa_s->clear_driver_scan_cache = 0;
 238         wpa_s->scan_work = work;
 239 }
 240
 241
 242 /**
 243  * wpa_supplicant_trigger_scan - Request driver to start a scan
 244  * @wpa_s: Pointer to wpa_supplicant data
 245  * @params: Scan parameters
 246  * Returns: 0 on success, -1 on failure
 247  */
 248 int wpa_supplicant_trigger_scan(struct wpa_supplicant *wpa_s,
 249                                 struct wpa_driver_scan_params *params)
 250 {
 251         struct wpa_driver_scan_params *ctx;
 252
 253         if (wpa_s->scan_work) {
 254                 wpa_dbg(wpa_s, MSG_INFO, "Reject scan trigger since one is already pending");
 255                 return -1;
 256         }
 257
 258         ctx = wpa_scan_clone_params(params);
 259         if (!ctx ||
 260             radio_add_work(wpa_s, 0, "scan", 0, wpas_trigger_scan_cb, ctx) < 0)
 261         {
 262                 wpa_scan_free_params(ctx);
 263                 wpa_msg(wpa_s, MSG_INFO, WPA_EVENT_SCAN_FAILED "ret=-1");
 264                 return -1;
 265         }
 266
 267         return 0;
 268 }
 269
 270
 271 static void
 272 wpa_supplicant_delayed_sched_scan_timeout(void *eloop_ctx, void *timeout_ctx)
 273 {
 274         struct wpa_supplicant *wpa_s = eloop_ctx;
 275
 276         wpa_dbg(wpa_s, MSG_DEBUG, "Starting delayed sched scan");
 277
 278         if (wpa_supplicant_req_sched_scan(wpa_s))
 279                 wpa_supplicant_req_scan(wpa_s, 0, 0);
 280 }
 281
 282
 283 static void
 284 wpa_supplicant_sched_scan_timeout(void *eloop_ctx, void *timeout_ctx)
 285 {
 286         struct wpa_supplicant *wpa_s = eloop_ctx;
 287
 288         wpa_dbg(wpa_s, MSG_DEBUG, "Sched scan timeout - stopping it");
 289
 290         wpa_s->sched_scan_timed_out = 1;
 291         wpa_supplicant_cancel_sched_scan(wpa_s);
 292 }
 293
 294
 295 static int
 296 wpa_supplicant_start_sched_scan(struct wpa_supplicant *wpa_s,
 297                                 struct wpa_driver_scan_params *params)
 298 {
 299         int ret;
 300
 301         wpa_supplicant_notify_scanning(wpa_s, 1);
 302         ret = wpa_drv_sched_scan(wpa_s, params);
 303         if (ret)
 304                 wpa_supplicant_notify_scanning(wpa_s, 0);
 305         else
 306                 wpa_s->sched_scanning = 1;
 307
 308         return ret;
 309 }
 310
 311
 312 static int wpa_supplicant_stop_sched_scan(struct wpa_supplicant *wpa_s)
 313 {
 314         int ret;
 315
 316         ret = wpa_drv_stop_sched_scan(wpa_s);
 317         if (ret) {
 318                 wpa_dbg(wpa_s, MSG_DEBUG, "stopping sched_scan failed!");
 319                 /* TODO: what to do if stopping fails? */
 320                 return -1;
 321         }
 322
 323         return ret;
 324 }
 325
 326
 327 static struct wpa_driver_scan_filter *
 328 wpa_supplicant_build_filter_ssids(struct wpa_config *conf, size_t *num_ssids)
 329 {
 330         struct wpa_driver_scan_filter *ssids;
 331         struct wpa_ssid *ssid;
 332         size_t count;
 333
 334         *num_ssids = 0;
 335         if (!conf->filter_ssids)
 336                 return NULL;
 337
 338         for (count = 0, ssid = conf->ssid; ssid; ssid = ssid->next) {
 339                 if (ssid->ssid && ssid->ssid_len)
 340                         count++;
 341         }
 342         if (count == 0)
 343                 return NULL;
 344         ssids = os_calloc(count, sizeof(struct wpa_driver_scan_filter));
 345         if (ssids == NULL)
 346                 return NULL;
 347
 348         for (ssid = conf->ssid; ssid; ssid = ssid->next) {
 349                 if (!ssid->ssid || !ssid->ssid_len)
 350                         continue;
 351                 os_memcpy(ssids[*num_ssids].ssid, ssid->ssid, ssid->ssid_len);
 352                 ssids[*num_ssids].ssid_len = ssid->ssid_len;
 353                 (*num_ssids)++;
 354         }
 355
 356         return ssids;
 357 }
 358
 359
 360 static void wpa_supplicant_optimize_freqs(
 361         struct wpa_supplicant *wpa_s, struct wpa_driver_scan_params *params)
 362 {
 363 #ifdef CONFIG_P2P
 364         if (params->freqs == NULL && wpa_s->p2p_in_provisioning &&
 365             wpa_s->go_params) {
 366                 /* Optimize provisioning state scan based on GO information */
 367                 if (wpa_s->p2p_in_provisioning < 5 &&
 368                     wpa_s->go_params->freq > 0) {
 369                         wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only GO "
 370                                 "preferred frequency %d MHz",
 371                                 wpa_s->go_params->freq);
 372                         params->freqs = os_calloc(2, sizeof(int));
 373                         if (params->freqs)
 374                                 params->freqs[0] = wpa_s->go_params->freq;
 375                 } else if (wpa_s->p2p_in_provisioning < 8 &&
 376                            wpa_s->go_params->freq_list[0]) {
 377                         wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only common "
 378                                 "channels");
 379                         int_array_concat(&params->freqs,
 380                                          wpa_s->go_params->freq_list);
 381                         if (params->freqs)
 382                                 int_array_sort_unique(params->freqs);
 383                 }
 384                 wpa_s->p2p_in_provisioning++;
 385         }
 386
 387         if (params->freqs == NULL && wpa_s->p2p_in_invitation) {
 388                 /*
 389                  * Optimize scan based on GO information during persistent
 390                  * group reinvocation
 391                  */
 392                 if (wpa_s->p2p_in_invitation < 5 &&
 393                     wpa_s->p2p_invite_go_freq > 0) {
 394                         wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only GO preferred frequency %d MHz during invitation",
 395                                 wpa_s->p2p_invite_go_freq);
 396                         params->freqs = os_calloc(2, sizeof(int));
 397                         if (params->freqs)
 398                                 params->freqs[0] = wpa_s->p2p_invite_go_freq;
 399                 }
 400                 wpa_s->p2p_in_invitation++;
 401                 if (wpa_s->p2p_in_invitation > 20) {
 402                         /*
 403                          * This should not really happen since the variable is
 404                          * cleared on group removal, but if it does happen, make
 405                          * sure we do not get stuck in special invitation scan
 406                          * mode.
 407                          */
 408                         wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Clear p2p_in_invitation");
 409                         wpa_s->p2p_in_invitation = 0;
 410                 }
 411         }
 412 #endif /* CONFIG_P2P */
 413
 414 #ifdef CONFIG_WPS
 415         if (params->freqs == NULL && wpa_s->after_wps && wpa_s->wps_freq) {
 416                 /*
 417                  * Optimize post-provisioning scan based on channel used
 418                  * during provisioning.
 419                  */
 420                 wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Scan only frequency %u MHz "
 421                         "that was used during provisioning", wpa_s->wps_freq);
 422                 params->freqs = os_calloc(2, sizeof(int));
 423                 if (params->freqs)
 424                         params->freqs[0] = wpa_s->wps_freq;
 425                 wpa_s->after_wps--;
 426         } else if (wpa_s->after_wps)
 427                 wpa_s->after_wps--;
 428
 429         if (params->freqs == NULL && wpa_s->known_wps_freq && wpa_s->wps_freq)
 430         {
 431                 /* Optimize provisioning scan based on already known channel */
 432                 wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Scan only frequency %u MHz",
 433                         wpa_s->wps_freq);
 434                 params->freqs = os_calloc(2, sizeof(int));
 435                 if (params->freqs)
 436                         params->freqs[0] = wpa_s->wps_freq;
 437                 wpa_s->known_wps_freq = 0; /* only do this once */
 438         }
 439 #endif /* CONFIG_WPS */
 440 }
 441
 442
 443 #ifdef CONFIG_INTERWORKING
 444 static void wpas_add_interworking_elements(struct wpa_supplicant *wpa_s,
 445                                            struct wpabuf *buf)
 446 {
 447         wpabuf_put_u8(buf, WLAN_EID_INTERWORKING);
 448         wpabuf_put_u8(buf, is_zero_ether_addr(wpa_s->conf->hessid) ? 1 :
 449                       1 + ETH_ALEN);
 450         wpabuf_put_u8(buf, wpa_s->conf->access_network_type);
 451         /* No Venue Info */
 452         if (!is_zero_ether_addr(wpa_s->conf->hessid))
 453                 wpabuf_put_data(buf, wpa_s->conf->hessid, ETH_ALEN);
 454 }
 455 #endif /* CONFIG_INTERWORKING */
 456
 457
 458 #ifdef CONFIG_MBO
 459 static void wpas_fils_req_param_add_max_channel(struct wpa_supplicant *wpa_s,
 460                                                 struct wpabuf **ie)
 461 {
 462         if (wpabuf_resize(ie, 5)) {
 463                 wpa_printf(MSG_DEBUG,
 464                            "Failed to allocate space for FILS Request Parameters element");
 465                 return;
 466         }
 467
 468         /* FILS Request Parameters element */
 469         wpabuf_put_u8(*ie, WLAN_EID_EXTENSION);
 470         wpabuf_put_u8(*ie, 3); /* FILS Request attribute length */
 471         wpabuf_put_u8(*ie, WLAN_EID_EXT_FILS_REQ_PARAMS);
 472         /* Parameter control bitmap */
 473         wpabuf_put_u8(*ie, 0);
 474         /* Max Channel Time field - contains the value of MaxChannelTime
 475          * parameter of the MLME-SCAN.request primitive represented in units of
 476          * TUs, as an unsigned integer. A Max Channel Time field value of 255
 477          * is used to indicate any duration of more than 254 TUs, or an
 478          * unspecified or unknown duration. (IEEE Std 802.11ai-2016, 9.4.2.178)
 479          */
 480         wpabuf_put_u8(*ie, 255);
 481 }
 482 #endif /* CONFIG_MBO */
 483
 484
 485 void wpa_supplicant_set_default_scan_ies(struct wpa_supplicant *wpa_s)
 486 {
 487         struct wpabuf *default_ies = NULL;
 488         u8 ext_capab[18];
 489         int ext_capab_len;
 490         enum wpa_driver_if_type type = WPA_IF_STATION;
 491
 492 #ifdef CONFIG_P2P
 493         if (wpa_s->p2p_group_interface == P2P_GROUP_INTERFACE_CLIENT)
 494                 type = WPA_IF_P2P_CLIENT;
 495 #endif /* CONFIG_P2P */
 496
 497         wpa_drv_get_ext_capa(wpa_s, type);
 498
 499         ext_capab_len = wpas_build_ext_capab(wpa_s, ext_capab,
 500                                              sizeof(ext_capab));
 501         if (ext_capab_len > 0 &&
 502             wpabuf_resize(&default_ies, ext_capab_len) == 0)
 503                 wpabuf_put_data(default_ies, ext_capab, ext_capab_len);
 504
 505 #ifdef CONFIG_MBO
 506         if (wpa_s->enable_oce & OCE_STA)
 507                 wpas_fils_req_param_add_max_channel(wpa_s, &default_ies);
 508         /* Send MBO and OCE capabilities */
 509         if (wpabuf_resize(&default_ies, 12) == 0)
 510                 wpas_mbo_scan_ie(wpa_s, default_ies);
 511 #endif /* CONFIG_MBO */
 512
 513         if (default_ies)
 514                 wpa_drv_set_default_scan_ies(wpa_s, wpabuf_head(default_ies),
 515                                              wpabuf_len(default_ies));
 516         wpabuf_free(default_ies);
 517 }
 518
 519
 520 static struct wpabuf * wpa_supplicant_extra_ies(struct wpa_supplicant *wpa_s)
 521 {
 522         struct wpabuf *extra_ie = NULL;
 523         u8 ext_capab[18];
 524         int ext_capab_len;
 525 #ifdef CONFIG_WPS
 526         int wps = 0;
 527         enum wps_request_type req_type = WPS_REQ_ENROLLEE_INFO;
 528 #endif /* CONFIG_WPS */
 529
 530 #ifdef CONFIG_P2P
 531         if (wpa_s->p2p_group_interface == P2P_GROUP_INTERFACE_CLIENT)
 532                 wpa_drv_get_ext_capa(wpa_s, WPA_IF_P2P_CLIENT);
 533         else
 534 #endif /* CONFIG_P2P */
 535                 wpa_drv_get_ext_capa(wpa_s, WPA_IF_STATION);
 536
 537         ext_capab_len = wpas_build_ext_capab(wpa_s, ext_capab,
 538                                              sizeof(ext_capab));
 539         if (ext_capab_len > 0 &&
 540             wpabuf_resize(&extra_ie, ext_capab_len) == 0)
 541                 wpabuf_put_data(extra_ie, ext_capab, ext_capab_len);
 542
 543 #ifdef CONFIG_INTERWORKING
 544         if (wpa_s->conf->interworking &&
 545             wpabuf_resize(&extra_ie, 100) == 0)
 546                 wpas_add_interworking_elements(wpa_s, extra_ie);
 547 #endif /* CONFIG_INTERWORKING */
 548
 549 #ifdef CONFIG_MBO
 550         if (wpa_s->enable_oce & OCE_STA)
 551                 wpas_fils_req_param_add_max_channel(wpa_s, &extra_ie);
 552 #endif /* CONFIG_MBO */
 553
 554 #ifdef CONFIG_WPS
 555         wps = wpas_wps_in_use(wpa_s, &req_type);
 556
 557         if (wps) {
 558                 struct wpabuf *wps_ie;
 559                 wps_ie = wps_build_probe_req_ie(wps == 2 ? DEV_PW_PUSHBUTTON :
 560                                                 DEV_PW_DEFAULT,
 561                                                 &wpa_s->wps->dev,
 562                                                 wpa_s->wps->uuid, req_type,
 563                                                 0, NULL);
 564                 if (wps_ie) {
 565                         if (wpabuf_resize(&extra_ie, wpabuf_len(wps_ie)) == 0)
 566                                 wpabuf_put_buf(extra_ie, wps_ie);
 567                         wpabuf_free(wps_ie);
 568                 }
 569         }
 570
 571 #ifdef CONFIG_P2P
 572         if (wps) {
 573                 size_t ielen = p2p_scan_ie_buf_len(wpa_s->global->p2p);
 574                 if (wpabuf_resize(&extra_ie, ielen) == 0)
 575                         wpas_p2p_scan_ie(wpa_s, extra_ie);
 576         }
 577 #endif /* CONFIG_P2P */
 578
 579         wpa_supplicant_mesh_add_scan_ie(wpa_s, &extra_ie);
 580
 581 #endif /* CONFIG_WPS */
 582
 583 #ifdef CONFIG_HS20
 584         if (wpa_s->conf->hs20 && wpabuf_resize(&extra_ie, 9) == 0)
 585                 wpas_hs20_add_indication(extra_ie, -1, 0);
 586 #endif /* CONFIG_HS20 */
 587
 588 #ifdef CONFIG_FST
 589         if (wpa_s->fst_ies &&
 590             wpabuf_resize(&extra_ie, wpabuf_len(wpa_s->fst_ies)) == 0)
 591                 wpabuf_put_buf(extra_ie, wpa_s->fst_ies);
 592 #endif /* CONFIG_FST */
 593
 594 #ifdef CONFIG_MBO
 595         /* Send MBO and OCE capabilities */
 596         if (wpabuf_resize(&extra_ie, 12) == 0)
 597                 wpas_mbo_scan_ie(wpa_s, extra_ie);
 598 #endif /* CONFIG_MBO */
 599
 600         if (wpa_s->vendor_elem[VENDOR_ELEM_PROBE_REQ]) {
 601                 struct wpabuf *buf = wpa_s->vendor_elem[VENDOR_ELEM_PROBE_REQ];
 602
 603                 if (wpabuf_resize(&extra_ie, wpabuf_len(buf)) == 0)
 604                         wpabuf_put_buf(extra_ie, buf);
 605         }
 606
 607         return extra_ie;
 608 }
 609
 610
 611 #ifdef CONFIG_P2P
 612
 613 /*
 614  * Check whether there are any enabled networks or credentials that could be
 615  * used for a non-P2P connection.
 616  */
 617 static int non_p2p_network_enabled(struct wpa_supplicant *wpa_s)
 618 {
 619         struct wpa_ssid *ssid;
 620
 621         for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
 622                 if (wpas_network_disabled(wpa_s, ssid))
 623                         continue;
 624                 if (!ssid->p2p_group)
 625                         return 1;
 626         }
 627
 628         if (wpa_s->conf->cred && wpa_s->conf->interworking &&
 629             wpa_s->conf->auto_interworking)
 630                 return 1;
 631
 632         return 0;
 633 }
 634
 635 #endif /* CONFIG_P2P */
 636
 637
 638 static void wpa_setband_scan_freqs_list(struct wpa_supplicant *wpa_s,
 639                                         enum hostapd_hw_mode band,
 640                                         struct wpa_driver_scan_params *params)
 641 {
 642         /* Include only supported channels for the specified band */
 643         struct hostapd_hw_modes *mode;
 644         int count, i;
 645
 646         mode = get_mode(wpa_s->hw.modes, wpa_s->hw.num_modes, band);
 647         if (mode == NULL) {
 648                 /* No channels supported in this band - use empty list */
 649                 params->freqs = os_zalloc(sizeof(int));
 650                 return;
 651         }
 652
 653         params->freqs = os_calloc(mode->num_channels + 1, sizeof(int));
 654         if (params->freqs == NULL)
 655                 return;
 656         for (count = 0, i = 0; i < mode->num_channels; i++) {
 657                 if (mode->channels[i].flag & HOSTAPD_CHAN_DISABLED)
 658                         continue;
 659                 params->freqs[count++] = mode->channels[i].freq;
 660         }
 661 }
 662
 663
 664 static void wpa_setband_scan_freqs(struct wpa_supplicant *wpa_s,
 665                                    struct wpa_driver_scan_params *params)
 666 {
 667         if (wpa_s->hw.modes == NULL)
 668                 return; /* unknown what channels the driver supports */
 669         if (params->freqs)
 670                 return; /* already using a limited channel set */
 671         if (wpa_s->setband == WPA_SETBAND_5G)
 672                 wpa_setband_scan_freqs_list(wpa_s, HOSTAPD_MODE_IEEE80211A,
 673                                             params);
 674         else if (wpa_s->setband == WPA_SETBAND_2G)
 675                 wpa_setband_scan_freqs_list(wpa_s, HOSTAPD_MODE_IEEE80211G,
 676                                             params);
 677 }
 678
 679
 680 static void wpa_add_scan_ssid(struct wpa_supplicant *wpa_s,
 681                               struct wpa_driver_scan_params *params,
 682                               size_t max_ssids, const u8 *ssid, size_t ssid_len)
 683 {
 684         unsigned int j;
 685
 686         for (j = 0; j < params->num_ssids; j++) {
 687                 if (params->ssids[j].ssid_len == ssid_len &&
 688                     params->ssids[j].ssid &&
 689                     os_memcmp(params->ssids[j].ssid, ssid, ssid_len) == 0)
 690                         return; /* already in the list */
 691         }
 692
 693         if (params->num_ssids + 1 > max_ssids) {
 694                 wpa_printf(MSG_DEBUG, "Over max scan SSIDs for manual request");
 695                 return;
 696         }
 697
 698         wpa_printf(MSG_DEBUG, "Scan SSID (manual request): %s",
 699                    wpa_ssid_txt(ssid, ssid_len));
 700
 701         params->ssids[params->num_ssids].ssid = ssid;
 702         params->ssids[params->num_ssids].ssid_len = ssid_len;
 703         params->num_ssids++;
 704 }
 705
 706
 707 static void wpa_add_owe_scan_ssid(struct wpa_supplicant *wpa_s,
 708                                   struct wpa_driver_scan_params *params,
 709                                   struct wpa_ssid *ssid, size_t max_ssids)
 710 {
 711 #ifdef CONFIG_OWE
 712         struct wpa_bss *bss;
 713
 714         if (!(ssid->key_mgmt & WPA_KEY_MGMT_OWE))
 715                 return;
 716
 717         wpa_printf(MSG_DEBUG, "OWE: Look for transition mode AP. ssid=%s",
 718                    wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
 719
 720         dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list) {
 721                 const u8 *owe, *pos, *end;
 722                 const u8 *owe_ssid;
 723                 size_t owe_ssid_len;
 724
 725                 if (bss->ssid_len != ssid->ssid_len ||
 726                     os_memcmp(bss->ssid, ssid->ssid, ssid->ssid_len) != 0)
 727                         continue;
 728
 729                 owe = wpa_bss_get_vendor_ie(bss, OWE_IE_VENDOR_TYPE);
 730                 if (!owe || owe[1] < 4)
 731                         continue;
 732
 733                 pos = owe + 6;
 734                 end = owe + 2 + owe[1];
 735
 736                 /* Must include BSSID and ssid_len */
 737                 if (end - pos < ETH_ALEN + 1)
 738                         return;
 739
 740                 /* Skip BSSID */
 741                 pos += ETH_ALEN;
 742                 owe_ssid_len = *pos++;
 743                 owe_ssid = pos;
 744
 745                 if ((size_t) (end - pos) < owe_ssid_len ||
 746                     owe_ssid_len > SSID_MAX_LEN)
 747                         return;
 748
 749                 wpa_printf(MSG_DEBUG,
 750                            "OWE: scan_ssids: transition mode OWE ssid=%s",
 751                            wpa_ssid_txt(owe_ssid, owe_ssid_len));
 752
 753                 wpa_add_scan_ssid(wpa_s, params, max_ssids,
 754                                   owe_ssid, owe_ssid_len);
 755                 return;
 756         }
 757 #endif /* CONFIG_OWE */
 758 }
 759
 760
 761 static void wpa_set_scan_ssids(struct wpa_supplicant *wpa_s,
 762                                struct wpa_driver_scan_params *params,
 763                                size_t max_ssids)
 764 {
 765         unsigned int i;
 766         struct wpa_ssid *ssid;
 767
 768         /*
 769          * For devices with max_ssids greater than 1, leave the last slot empty
 770          * for adding the wildcard scan entry.
 771          */
 772         max_ssids = max_ssids > 1 ? max_ssids - 1 : max_ssids;
 773
 774         for (i = 0; i < wpa_s->scan_id_count; i++) {
 775                 ssid = wpa_config_get_network(wpa_s->conf, wpa_s->scan_id[i]);
 776                 if (!ssid)
 777                         continue;
 778                 if (ssid->scan_ssid)
 779                         wpa_add_scan_ssid(wpa_s, params, max_ssids,
 780                                           ssid->ssid, ssid->ssid_len);
 781                 /*
 782                  * Also add the SSID of the OWE BSS, to allow discovery of
 783                  * transition mode APs more quickly.
 784                  */
 785                 wpa_add_owe_scan_ssid(wpa_s, params, ssid, max_ssids);
 786         }
 787
 788         wpa_s->scan_id_count = 0;
 789 }
 790
 791
 792 static int wpa_set_ssids_from_scan_req(struct wpa_supplicant *wpa_s,
 793                                        struct wpa_driver_scan_params *params,
 794                                        size_t max_ssids)
 795 {
 796         unsigned int i;
 797
 798         if (wpa_s->ssids_from_scan_req == NULL ||
 799             wpa_s->num_ssids_from_scan_req == 0)
 800                 return 0;
 801
 802         if (wpa_s->num_ssids_from_scan_req > max_ssids) {
 803                 wpa_s->num_ssids_from_scan_req = max_ssids;
 804                 wpa_printf(MSG_DEBUG, "Over max scan SSIDs from scan req: %u",
 805                            (unsigned int) max_ssids);
 806         }
 807
 808         for (i = 0; i < wpa_s->num_ssids_from_scan_req; i++) {
 809                 params->ssids[i].ssid = wpa_s->ssids_from_scan_req[i].ssid;
 810                 params->ssids[i].ssid_len =
 811                         wpa_s->ssids_from_scan_req[i].ssid_len;
 812                 wpa_hexdump_ascii(MSG_DEBUG, "specific SSID",
 813                                   params->ssids[i].ssid,
 814                                   params->ssids[i].ssid_len);
 815         }
 816
 817         params->num_ssids = wpa_s->num_ssids_from_scan_req;
 818         wpa_s->num_ssids_from_scan_req = 0;
 819         return 1;
 820 }
 821
 822
 823 static void wpa_supplicant_scan(void *eloop_ctx, void *timeout_ctx)
 824 {
 825         struct wpa_supplicant *wpa_s = eloop_ctx;
 826         struct wpa_ssid *ssid;
 827         int ret, p2p_in_prog;
 828         struct wpabuf *extra_ie = NULL;
 829         struct wpa_driver_scan_params params;
 830         struct wpa_driver_scan_params *scan_params;
 831         size_t max_ssids;
 832         int connect_without_scan = 0;
 833
 834         wpa_s->ignore_post_flush_scan_res = 0;
 835
 836         if (wpa_s->wpa_state == WPA_INTERFACE_DISABLED) {
 837                 wpa_dbg(wpa_s, MSG_DEBUG, "Skip scan - interface disabled");
 838                 return;
 839         }
 840
 841         if (wpa_s->disconnected && wpa_s->scan_req == NORMAL_SCAN_REQ) {
 842                 wpa_dbg(wpa_s, MSG_DEBUG, "Disconnected - do not scan");
 843                 wpa_supplicant_set_state(wpa_s, WPA_DISCONNECTED);
 844                 return;
 845         }
 846
 847         if (wpa_s->scanning) {
 848                 /*
 849                  * If we are already in scanning state, we shall reschedule the
 850                  * the incoming scan request.
 851                  */
 852                 wpa_dbg(wpa_s, MSG_DEBUG, "Already scanning - Reschedule the incoming scan req");
 853                 wpa_supplicant_req_scan(wpa_s, 1, 0);
 854                 return;
 855         }
 856
 857         if (!wpa_supplicant_enabled_networks(wpa_s) &&
 858             wpa_s->scan_req == NORMAL_SCAN_REQ) {
 859                 wpa_dbg(wpa_s, MSG_DEBUG, "No enabled networks - do not scan");
 860                 wpa_supplicant_set_state(wpa_s, WPA_INACTIVE);
 861                 return;
 862         }
 863
 864         if (wpa_s->conf->ap_scan != 0 &&
 865             (wpa_s->drv_flags & WPA_DRIVER_FLAGS_WIRED)) {
 866                 wpa_dbg(wpa_s, MSG_DEBUG, "Using wired authentication - "
 867                         "overriding ap_scan configuration");
 868                 wpa_s->conf->ap_scan = 0;
 869                 wpas_notify_ap_scan_changed(wpa_s);
 870         }
 871
 872         if (wpa_s->conf->ap_scan == 0) {
 873                 wpa_supplicant_gen_assoc_event(wpa_s);
 874                 return;
 875         }
 876
 877         ssid = NULL;
 878         if (wpa_s->scan_req != MANUAL_SCAN_REQ &&
 879             wpa_s->connect_without_scan) {
 880                 connect_without_scan = 1;
 881                 for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
 882                         if (ssid == wpa_s->connect_without_scan)
 883                                 break;
 884                 }
 885         }
 886
 887         p2p_in_prog = wpas_p2p_in_progress(wpa_s);
 888         if (p2p_in_prog && p2p_in_prog != 2 &&
 889             (!ssid ||
 890              (ssid->mode != WPAS_MODE_AP && ssid->mode != WPAS_MODE_P2P_GO))) {
 891                 wpa_dbg(wpa_s, MSG_DEBUG, "Delay station mode scan while P2P operation is in progress");
 892                 wpa_supplicant_req_scan(wpa_s, 5, 0);
 893                 return;
 894         }
 895
 896         /*
 897          * Don't cancel the scan based on ongoing PNO; defer it. Some scans are
 898          * used for changing modes inside wpa_supplicant (roaming,
 899          * auto-reconnect, etc). Discarding the scan might hurt these processes.
 900          * The normal use case for PNO is to suspend the host immediately after
 901          * starting PNO, so the periodic 100 ms attempts to run the scan do not
 902          * normally happen in practice multiple times, i.e., this is simply
 903          * restarting scanning once the host is woken up and PNO stopped.
 904          */
 905         if (wpa_s->pno || wpa_s->pno_sched_pending) {
 906                 wpa_dbg(wpa_s, MSG_DEBUG, "Defer scan - PNO is in progress");
 907                 wpa_supplicant_req_scan(wpa_s, 0, 100000);
 908                 return;
 909         }
 910
 911         if (wpa_s->conf->ap_scan == 2)
 912                 max_ssids = 1;
 913         else {
 914                 max_ssids = wpa_s->max_scan_ssids;
 915                 if (max_ssids > WPAS_MAX_SCAN_SSIDS)
 916                         max_ssids = WPAS_MAX_SCAN_SSIDS;
 917         }
 918
 919         wpa_s->last_scan_req = wpa_s->scan_req;
 920         wpa_s->scan_req = NORMAL_SCAN_REQ;
 921
 922         if (connect_without_scan) {
 923                 wpa_s->connect_without_scan = NULL;
 924                 if (ssid) {
 925                         wpa_printf(MSG_DEBUG, "Start a pre-selected network "
 926                                    "without scan step");
 927                         wpa_supplicant_associate(wpa_s, NULL, ssid);
 928                         return;
 929                 }
 930         }
 931
 932         os_memset(&params, 0, sizeof(params));
 933
 934         wpa_s->scan_prev_wpa_state = wpa_s->wpa_state;
 935         if (wpa_s->wpa_state == WPA_DISCONNECTED ||
 936             wpa_s->wpa_state == WPA_INACTIVE)
 937                 wpa_supplicant_set_state(wpa_s, WPA_SCANNING);
 938
 939         /*
 940          * If autoscan has set its own scanning parameters
 941          */
 942         if (wpa_s->autoscan_params != NULL) {
 943                 scan_params = wpa_s->autoscan_params;
 944                 goto scan;
 945         }
 946
 947         if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
 948             wpa_set_ssids_from_scan_req(wpa_s, &params, max_ssids)) {
 949                 wpa_printf(MSG_DEBUG, "Use specific SSIDs from SCAN command");
 950                 goto ssid_list_set;
 951         }
 952
 953 #ifdef CONFIG_P2P
 954         if ((wpa_s->p2p_in_provisioning || wpa_s->show_group_started) &&
 955             wpa_s->go_params && !wpa_s->conf->passive_scan) {
 956                 wpa_printf(MSG_DEBUG, "P2P: Use specific SSID for scan during P2P group formation (p2p_in_provisioning=%d show_group_started=%d)",
 957                            wpa_s->p2p_in_provisioning,
 958                            wpa_s->show_group_started);
 959                 params.ssids[0].ssid = wpa_s->go_params->ssid;
 960                 params.ssids[0].ssid_len = wpa_s->go_params->ssid_len;
 961                 params.num_ssids = 1;
 962                 goto ssid_list_set;
 963         }
 964
 965         if (wpa_s->p2p_in_invitation) {
 966                 if (wpa_s->current_ssid) {
 967                         wpa_printf(MSG_DEBUG, "P2P: Use specific SSID for scan during invitation");
 968                         params.ssids[0].ssid = wpa_s->current_ssid->ssid;
 969                         params.ssids[0].ssid_len =
 970                                 wpa_s->current_ssid->ssid_len;
 971                         params.num_ssids = 1;
 972                 } else {
 973                         wpa_printf(MSG_DEBUG, "P2P: No specific SSID known for scan during invitation");
 974                 }
 975                 goto ssid_list_set;
 976         }
 977 #endif /* CONFIG_P2P */
 978
 979         /* Find the starting point from which to continue scanning */
 980         ssid = wpa_s->conf->ssid;
 981         if (wpa_s->prev_scan_ssid != WILDCARD_SSID_SCAN) {
 982                 while (ssid) {
 983                         if (ssid == wpa_s->prev_scan_ssid) {
 984                                 ssid = ssid->next;
 985                                 break;
 986                         }
 987                         ssid = ssid->next;
 988                 }
 989         }
 990
 991         if (wpa_s->last_scan_req != MANUAL_SCAN_REQ &&
 992 #ifdef CONFIG_AP
 993             !wpa_s->ap_iface &&
 994 #endif /* CONFIG_AP */
 995             wpa_s->conf->ap_scan == 2) {
 996                 wpa_s->connect_without_scan = NULL;
 997                 wpa_s->prev_scan_wildcard = 0;
 998                 wpa_supplicant_assoc_try(wpa_s, ssid);
 999                 return;
1000         } else if (wpa_s->conf->ap_scan == 2) {
1001                 /*
1002                  * User-initiated scan request in ap_scan == 2; scan with
1003                  * wildcard SSID.
1004                  */
1005                 ssid = NULL;
1006         } else if (wpa_s->reattach && wpa_s->current_ssid != NULL) {
1007                 /*
1008                  * Perform single-channel single-SSID scan for
1009                  * reassociate-to-same-BSS operation.
1010                  */
1011                 /* Setup SSID */
1012                 ssid = wpa_s->current_ssid;
1013                 wpa_hexdump_ascii(MSG_DEBUG, "Scan SSID",
1014                                   ssid->ssid, ssid->ssid_len);
1015                 params.ssids[0].ssid = ssid->ssid;
1016                 params.ssids[0].ssid_len = ssid->ssid_len;
1017                 params.num_ssids = 1;
1018
1019                 /*
1020                  * Allocate memory for frequency array, allocate one extra
1021                  * slot for the zero-terminator.
1022                  */
1023                 params.freqs = os_malloc(sizeof(int) * 2);
1024                 if (params.freqs) {
1025                         params.freqs[0] = wpa_s->assoc_freq;
1026                         params.freqs[1] = 0;
1027                 }
1028
1029                 /*
1030                  * Reset the reattach flag so that we fall back to full scan if
1031                  * this scan fails.
1032                  */
1033                 wpa_s->reattach = 0;
1034         } else {
1035                 struct wpa_ssid *start = ssid, *tssid;
1036                 int freqs_set = 0;
1037                 if (ssid == NULL && max_ssids > 1)
1038                         ssid = wpa_s->conf->ssid;
1039                 while (ssid) {
1040                         if (!wpas_network_disabled(wpa_s, ssid) &&
1041                             ssid->scan_ssid) {
1042                                 wpa_hexdump_ascii(MSG_DEBUG, "Scan SSID",
1043                                                   ssid->ssid, ssid->ssid_len);
1044                                 params.ssids[params.num_ssids].ssid =
1045                                         ssid->ssid;
1046                                 params.ssids[params.num_ssids].ssid_len =
1047                                         ssid->ssid_len;
1048                                 params.num_ssids++;
1049                                 if (params.num_ssids + 1 >= max_ssids)
1050                                         break;
1051                         }
1052
1053                         if (!wpas_network_disabled(wpa_s, ssid)) {
1054                                 /*
1055                                  * Also add the SSID of the OWE BSS, to allow
1056                                  * discovery of transition mode APs more
1057                                  * quickly.
1058                                  */
1059                                 wpa_add_owe_scan_ssid(wpa_s, &params, ssid,
1060                                                       max_ssids);
1061                         }
1062
1063                         ssid = ssid->next;
1064                         if (ssid == start)
1065                                 break;
1066                         if (ssid == NULL && max_ssids > 1 &&
1067                             start != wpa_s->conf->ssid)
1068                                 ssid = wpa_s->conf->ssid;
1069                 }
1070
1071                 if (wpa_s->scan_id_count &&
1072                     wpa_s->last_scan_req == MANUAL_SCAN_REQ)
1073                         wpa_set_scan_ssids(wpa_s, &params, max_ssids);
1074
1075                 for (tssid = wpa_s->conf->ssid;
1076                      wpa_s->last_scan_req != MANUAL_SCAN_REQ && tssid;
1077                      tssid = tssid->next) {
1078                         if (wpas_network_disabled(wpa_s, tssid))
1079                                 continue;
1080                         if ((params.freqs || !freqs_set) && tssid->scan_freq) {
1081                                 int_array_concat(&params.freqs,
1082                                                  tssid->scan_freq);
1083                         } else {
1084                                 os_free(params.freqs);
1085                                 params.freqs = NULL;
1086                         }
1087                         freqs_set = 1;
1088                 }
1089                 int_array_sort_unique(params.freqs);
1090         }
1091
1092         if (ssid && max_ssids == 1) {
1093                 /*
1094                  * If the driver is limited to 1 SSID at a time interleave
1095                  * wildcard SSID scans with specific SSID scans to avoid
1096                  * waiting a long time for a wildcard scan.
1097                  */
1098                 if (!wpa_s->prev_scan_wildcard) {
1099                         params.ssids[0].ssid = NULL;
1100                         params.ssids[0].ssid_len = 0;
1101                         wpa_s->prev_scan_wildcard = 1;
1102                         wpa_dbg(wpa_s, MSG_DEBUG, "Starting AP scan for "
1103                                 "wildcard SSID (Interleave with specific)");
1104                 } else {
1105                         wpa_s->prev_scan_ssid = ssid;
1106                         wpa_s->prev_scan_wildcard = 0;
1107                         wpa_dbg(wpa_s, MSG_DEBUG,
1108                                 "Starting AP scan for specific SSID: %s",
1109                                 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
1110                 }
1111         } else if (ssid) {
1112                 /* max_ssids > 1 */
1113
1114                 wpa_s->prev_scan_ssid = ssid;
1115                 wpa_dbg(wpa_s, MSG_DEBUG, "Include wildcard SSID in "
1116                         "the scan request");
1117                 params.num_ssids++;
1118         } else if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
1119                    wpa_s->manual_scan_passive && params.num_ssids == 0) {
1120                 wpa_dbg(wpa_s, MSG_DEBUG, "Use passive scan based on manual request");
1121         } else if (wpa_s->conf->passive_scan) {
1122                 wpa_dbg(wpa_s, MSG_DEBUG,
1123                         "Use passive scan based on configuration");
1124         } else {
1125                 wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
1126                 params.num_ssids++;
1127                 wpa_dbg(wpa_s, MSG_DEBUG, "Starting AP scan for wildcard "
1128                         "SSID");
1129         }
1130
1131 ssid_list_set:
1132         wpa_supplicant_optimize_freqs(wpa_s, &params);
1133         extra_ie = wpa_supplicant_extra_ies(wpa_s);
1134
1135         if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
1136             wpa_s->manual_scan_only_new) {
1137                 wpa_printf(MSG_DEBUG,
1138                            "Request driver to clear scan cache due to manual only_new=1 scan");
1139                 params.only_new_results = 1;
1140         }
1141
1142         if (wpa_s->last_scan_req == MANUAL_SCAN_REQ && params.freqs == NULL &&
1143             wpa_s->manual_scan_freqs) {
1144                 wpa_dbg(wpa_s, MSG_DEBUG, "Limit manual scan to specified channels");
1145                 params.freqs = wpa_s->manual_scan_freqs;
1146                 wpa_s->manual_scan_freqs = NULL;
1147         }
1148
1149         if (params.freqs == NULL && wpa_s->select_network_scan_freqs) {
1150                 wpa_dbg(wpa_s, MSG_DEBUG,
1151                         "Limit select_network scan to specified channels");
1152                 params.freqs = wpa_s->select_network_scan_freqs;
1153                 wpa_s->select_network_scan_freqs = NULL;
1154         }
1155
1156         if (params.freqs == NULL && wpa_s->next_scan_freqs) {
1157                 wpa_dbg(wpa_s, MSG_DEBUG, "Optimize scan based on previously "
1158                         "generated frequency list");
1159                 params.freqs = wpa_s->next_scan_freqs;
1160         } else
1161                 os_free(wpa_s->next_scan_freqs);
1162         wpa_s->next_scan_freqs = NULL;
1163         wpa_setband_scan_freqs(wpa_s, &params);
1164
1165         /* See if user specified frequencies. If so, scan only those. */
1166         if (wpa_s->conf->freq_list && !params.freqs) {
1167                 wpa_dbg(wpa_s, MSG_DEBUG,
1168                         "Optimize scan based on conf->freq_list");
1169                 int_array_concat(&params.freqs, wpa_s->conf->freq_list);
1170         }
1171
1172         /* Use current associated channel? */
1173         if (wpa_s->conf->scan_cur_freq && !params.freqs) {
1174                 unsigned int num = wpa_s->num_multichan_concurrent;
1175
1176                 params.freqs = os_calloc(num + 1, sizeof(int));
1177                 if (params.freqs) {
1178                         num = get_shared_radio_freqs(wpa_s, params.freqs, num);
1179                         if (num > 0) {
1180                                 wpa_dbg(wpa_s, MSG_DEBUG, "Scan only the "
1181                                         "current operating channels since "
1182                                         "scan_cur_freq is enabled");
1183                         } else {
1184                                 os_free(params.freqs);
1185                                 params.freqs = NULL;
1186                         }
1187                 }
1188         }
1189
1190 #ifdef CONFIG_MBO
1191         if (wpa_s->enable_oce & OCE_STA)
1192                 params.oce_scan = 1;
1193 #endif /* CONFIG_MBO */
1194
1195         params.filter_ssids = wpa_supplicant_build_filter_ssids(
1196                 wpa_s->conf, &params.num_filter_ssids);
1197         if (extra_ie) {
1198                 params.extra_ies = wpabuf_head(extra_ie);
1199                 params.extra_ies_len = wpabuf_len(extra_ie);
1200         }
1201
1202 #ifdef CONFIG_P2P
1203         if (wpa_s->p2p_in_provisioning || wpa_s->p2p_in_invitation ||
1204             (wpa_s->show_group_started && wpa_s->go_params)) {
1205                 /*
1206                  * The interface may not yet be in P2P mode, so we have to
1207                  * explicitly request P2P probe to disable CCK rates.
1208                  */
1209                 params.p2p_probe = 1;
1210         }
1211 #endif /* CONFIG_P2P */
1212
1213         if ((wpa_s->mac_addr_rand_enable & MAC_ADDR_RAND_SCAN) &&
1214             wpa_s->wpa_state <= WPA_SCANNING) {
1215                 params.mac_addr_rand = 1;
1216                 if (wpa_s->mac_addr_scan) {
1217                         params.mac_addr = wpa_s->mac_addr_scan;
1218                         params.mac_addr_mask = wpa_s->mac_addr_scan + ETH_ALEN;
1219                 }
1220         }
1221
1222         if (!is_zero_ether_addr(wpa_s->next_scan_bssid)) {
1223                 struct wpa_bss *bss;
1224
1225                 params.bssid = wpa_s->next_scan_bssid;
1226                 bss = wpa_bss_get_bssid_latest(wpa_s, params.bssid);
1227                 if (bss && bss->ssid_len && params.num_ssids == 1 &&
1228                     params.ssids[0].ssid_len == 0) {
1229                         params.ssids[0].ssid = bss->ssid;
1230                         params.ssids[0].ssid_len = bss->ssid_len;
1231                         wpa_dbg(wpa_s, MSG_DEBUG,
1232                                 "Scan a previously specified BSSID " MACSTR
1233                                 " and SSID %s",
1234                                 MAC2STR(params.bssid),
1235                                 wpa_ssid_txt(bss->ssid, bss->ssid_len));
1236                 } else {
1237                         wpa_dbg(wpa_s, MSG_DEBUG,
1238                                 "Scan a previously specified BSSID " MACSTR,
1239                                 MAC2STR(params.bssid));
1240                 }
1241         }
1242
1243         scan_params = &params;
1244
1245 scan:
1246 #ifdef CONFIG_P2P
1247         /*
1248          * If the driver does not support multi-channel concurrency and a
1249          * virtual interface that shares the same radio with the wpa_s interface
1250          * is operating there may not be need to scan other channels apart from
1251          * the current operating channel on the other virtual interface. Filter
1252          * out other channels in case we are trying to find a connection for a
1253          * station interface when we are not configured to prefer station
1254          * connection and a concurrent operation is already in process.
1255          */
1256         if (wpa_s->scan_for_connection &&
1257             wpa_s->last_scan_req == NORMAL_SCAN_REQ &&
1258             !scan_params->freqs && !params.freqs &&
1259             wpas_is_p2p_prioritized(wpa_s) &&
1260             wpa_s->p2p_group_interface == NOT_P2P_GROUP_INTERFACE &&
1261             non_p2p_network_enabled(wpa_s)) {
1262                 unsigned int num = wpa_s->num_multichan_concurrent;
1263
1264                 params.freqs = os_calloc(num + 1, sizeof(int));
1265                 if (params.freqs) {
1266                         num = get_shared_radio_freqs(wpa_s, params.freqs, num);
1267                         if (num > 0 && num == wpa_s->num_multichan_concurrent) {
1268                                 wpa_dbg(wpa_s, MSG_DEBUG, "Scan only the current operating channels since all channels are already used");
1269                         } else {
1270                                 os_free(params.freqs);
1271                                 params.freqs = NULL;
1272                         }
1273                 }
1274         }
1275 #endif /* CONFIG_P2P */
1276
1277         ret = wpa_supplicant_trigger_scan(wpa_s, scan_params);
1278
1279         if (ret && wpa_s->last_scan_req == MANUAL_SCAN_REQ && params.freqs &&
1280             !wpa_s->manual_scan_freqs) {
1281                 /* Restore manual_scan_freqs for the next attempt */
1282                 wpa_s->manual_scan_freqs = params.freqs;
1283                 params.freqs = NULL;
1284         }
1285
1286         wpabuf_free(extra_ie);
1287         os_free(params.freqs);
1288         os_free(params.filter_ssids);
1289
1290         if (ret) {
1291                 wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate AP scan");
1292                 if (wpa_s->scan_prev_wpa_state != wpa_s->wpa_state)
1293                         wpa_supplicant_set_state(wpa_s,
1294                                                  wpa_s->scan_prev_wpa_state);
1295                 /* Restore scan_req since we will try to scan again */
1296                 wpa_s->scan_req = wpa_s->last_scan_req;
1297                 wpa_supplicant_req_scan(wpa_s, 1, 0);
1298         } else {
1299                 wpa_s->scan_for_connection = 0;
1300 #ifdef CONFIG_INTERWORKING
1301                 wpa_s->interworking_fast_assoc_tried = 0;
1302 #endif /* CONFIG_INTERWORKING */
1303                 if (params.bssid)
1304                         os_memset(wpa_s->next_scan_bssid, 0, ETH_ALEN);
1305         }
1306 }
1307
1308
1309 void wpa_supplicant_update_scan_int(struct wpa_supplicant *wpa_s, int sec)
1310 {
1311         struct os_reltime remaining, new_int;
1312         int cancelled;
1313
1314         cancelled = eloop_cancel_timeout_one(wpa_supplicant_scan, wpa_s, NULL,
1315                                              &remaining);
1316
1317         new_int.sec = sec;
1318         new_int.usec = 0;
1319         if (cancelled && os_reltime_before(&remaining, &new_int)) {
1320                 new_int.sec = remaining.sec;
1321                 new_int.usec = remaining.usec;
1322         }
1323
1324         if (cancelled) {
1325                 eloop_register_timeout(new_int.sec, new_int.usec,
1326                                        wpa_supplicant_scan, wpa_s, NULL);
1327         }
1328         wpa_s->scan_interval = sec;
1329 }
1330
1331
1332 /**
1333  * wpa_supplicant_req_scan - Schedule a scan for neighboring access points
1334  * @wpa_s: Pointer to wpa_supplicant data
1335  * @sec: Number of seconds after which to scan
1336  * @usec: Number of microseconds after which to scan
1337  *
1338  * This function is used to schedule a scan for neighboring access points after
1339  * the specified time.
1340  */
1341 void wpa_supplicant_req_scan(struct wpa_supplicant *wpa_s, int sec, int usec)
1342 {
1343         int res;
1344
1345         if (wpa_s->p2p_mgmt) {
1346                 wpa_dbg(wpa_s, MSG_DEBUG,
1347                         "Ignore scan request (%d.%06d sec) on p2p_mgmt interface",
1348                         sec, usec);
1349                 return;
1350         }
1351
1352         res = eloop_deplete_timeout(sec, usec, wpa_supplicant_scan, wpa_s,
1353                                     NULL);
1354         if (res == 1) {
1355                 wpa_dbg(wpa_s, MSG_DEBUG, "Rescheduling scan request: %d.%06d sec",
1356                         sec, usec);
1357         } else if (res == 0) {
1358                 wpa_dbg(wpa_s, MSG_DEBUG, "Ignore new scan request for %d.%06d sec since an earlier request is scheduled to trigger sooner",
1359                         sec, usec);
1360         } else {
1361                 wpa_dbg(wpa_s, MSG_DEBUG, "Setting scan request: %d.%06d sec",
1362                         sec, usec);
1363                 eloop_register_timeout(sec, usec, wpa_supplicant_scan, wpa_s, NULL);
1364         }
1365 }
1366
1367
1368 /**
1369  * wpa_supplicant_delayed_sched_scan - Request a delayed scheduled scan
1370  * @wpa_s: Pointer to wpa_supplicant data
1371  * @sec: Number of seconds after which to scan
1372  * @usec: Number of microseconds after which to scan
1373  * Returns: 0 on success or -1 otherwise
1374  *
1375  * This function is used to schedule periodic scans for neighboring
1376  * access points after the specified time.
1377  */
1378 int wpa_supplicant_delayed_sched_scan(struct wpa_supplicant *wpa_s,
1379                                       int sec, int usec)
1380 {
1381         if (!wpa_s->sched_scan_supported)
1382                 return -1;
1383
1384         eloop_register_timeout(sec, usec,
1385                                wpa_supplicant_delayed_sched_scan_timeout,
1386                                wpa_s, NULL);
1387
1388         return 0;
1389 }
1390
1391
1392 static void
1393 wpa_scan_set_relative_rssi_params(struct wpa_supplicant *wpa_s,
1394                                   struct wpa_driver_scan_params *params)
1395 {
1396         if (wpa_s->wpa_state != WPA_COMPLETED ||
1397             !(wpa_s->drv_flags & WPA_DRIVER_FLAGS_SCHED_SCAN_RELATIVE_RSSI) ||
1398             wpa_s->srp.relative_rssi_set == 0)
1399                 return;
1400
1401         params->relative_rssi_set = 1;
1402         params->relative_rssi = wpa_s->srp.relative_rssi;
1403
1404         if (wpa_s->srp.relative_adjust_rssi == 0)
1405                 return;
1406
1407         params->relative_adjust_band = wpa_s->srp.relative_adjust_band;
1408         params->relative_adjust_rssi = wpa_s->srp.relative_adjust_rssi;
1409 }
1410
1411
1412 /**
1413  * wpa_supplicant_req_sched_scan - Start a periodic scheduled scan
1414  * @wpa_s: Pointer to wpa_supplicant data
1415  * Returns: 0 is sched_scan was started or -1 otherwise
1416  *
1417  * This function is used to schedule periodic scans for neighboring
1418  * access points repeating the scan continuously.
1419  */
1420 int wpa_supplicant_req_sched_scan(struct wpa_supplicant *wpa_s)
1421 {
1422         struct wpa_driver_scan_params params;
1423         struct wpa_driver_scan_params *scan_params;
1424         enum wpa_states prev_state;
1425         struct wpa_ssid *ssid = NULL;
1426         struct wpabuf *extra_ie = NULL;
1427         int ret;
1428         unsigned int max_sched_scan_ssids;
1429         int wildcard = 0;
1430         int need_ssids;
1431         struct sched_scan_plan scan_plan;
1432
1433         if (!wpa_s->sched_scan_supported)
1434                 return -1;
1435
1436         if (wpa_s->max_sched_scan_ssids > WPAS_MAX_SCAN_SSIDS)
1437                 max_sched_scan_ssids = WPAS_MAX_SCAN_SSIDS;
1438         else
1439                 max_sched_scan_ssids = wpa_s->max_sched_scan_ssids;
1440         if (max_sched_scan_ssids < 1 || wpa_s->conf->disable_scan_offload)
1441                 return -1;
1442
1443         wpa_s->sched_scan_stop_req = 0;
1444
1445         if (wpa_s->sched_scanning) {
1446                 wpa_dbg(wpa_s, MSG_DEBUG, "Already sched scanning");
1447                 return 0;
1448         }
1449
1450         need_ssids = 0;
1451         for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
1452                 if (!wpas_network_disabled(wpa_s, ssid) && !ssid->scan_ssid) {
1453                         /* Use wildcard SSID to find this network */
1454                         wildcard = 1;
1455                 } else if (!wpas_network_disabled(wpa_s, ssid) &&
1456                            ssid->ssid_len)
1457                         need_ssids++;
1458
1459 #ifdef CONFIG_WPS
1460                 if (!wpas_network_disabled(wpa_s, ssid) &&
1461                     ssid->key_mgmt == WPA_KEY_MGMT_WPS) {
1462                         /*
1463                          * Normal scan is more reliable and faster for WPS
1464                          * operations and since these are for short periods of
1465                          * time, the benefit of trying to use sched_scan would
1466                          * be limited.
1467                          */
1468                         wpa_dbg(wpa_s, MSG_DEBUG, "Use normal scan instead of "
1469                                 "sched_scan for WPS");
1470                         return -1;
1471                 }
1472 #endif /* CONFIG_WPS */
1473         }
1474         if (wildcard)
1475                 need_ssids++;
1476
1477         if (wpa_s->normal_scans < 3 &&
1478             (need_ssids <= wpa_s->max_scan_ssids ||
1479              wpa_s->max_scan_ssids >= (int) max_sched_scan_ssids)) {
1480                 /*
1481                  * When normal scan can speed up operations, use that for the
1482                  * first operations before starting the sched_scan to allow
1483                  * user space sleep more. We do this only if the normal scan
1484                  * has functionality that is suitable for this or if the
1485                  * sched_scan does not have better support for multiple SSIDs.
1486                  */
1487                 wpa_dbg(wpa_s, MSG_DEBUG, "Use normal scan instead of "
1488                         "sched_scan for initial scans (normal_scans=%d)",
1489                         wpa_s->normal_scans);
1490                 return -1;
1491         }
1492
1493         os_memset(&params, 0, sizeof(params));
1494
1495         /* If we can't allocate space for the filters, we just don't filter */
1496         params.filter_ssids = os_calloc(wpa_s->max_match_sets,
1497                                         sizeof(struct wpa_driver_scan_filter));
1498
1499         prev_state = wpa_s->wpa_state;
1500         if (wpa_s->wpa_state == WPA_DISCONNECTED ||
1501             wpa_s->wpa_state == WPA_INACTIVE)
1502                 wpa_supplicant_set_state(wpa_s, WPA_SCANNING);
1503
1504         if (wpa_s->autoscan_params != NULL) {
1505                 scan_params = wpa_s->autoscan_params;
1506                 goto scan;
1507         }
1508
1509         /* Find the starting point from which to continue scanning */
1510         ssid = wpa_s->conf->ssid;
1511         if (wpa_s->prev_sched_ssid) {
1512                 while (ssid) {
1513                         if (ssid == wpa_s->prev_sched_ssid) {
1514                                 ssid = ssid->next;
1515                                 break;
1516                         }
1517                         ssid = ssid->next;
1518                 }
1519         }
1520
1521         if (!ssid || !wpa_s->prev_sched_ssid) {
1522                 wpa_dbg(wpa_s, MSG_DEBUG, "Beginning of SSID list");
1523                 wpa_s->sched_scan_timeout = max_sched_scan_ssids * 2;
1524                 wpa_s->first_sched_scan = 1;
1525                 ssid = wpa_s->conf->ssid;
1526                 wpa_s->prev_sched_ssid = ssid;
1527         }
1528
1529         if (wildcard) {
1530                 wpa_dbg(wpa_s, MSG_DEBUG, "Add wildcard SSID to sched_scan");
1531                 params.num_ssids++;
1532         }
1533
1534         while (ssid) {
1535                 if (wpas_network_disabled(wpa_s, ssid))
1536                         goto next;
1537
1538                 if (params.num_filter_ssids < wpa_s->max_match_sets &&
1539                     params.filter_ssids && ssid->ssid && ssid->ssid_len) {
1540                         wpa_dbg(wpa_s, MSG_DEBUG, "add to filter ssid: %s",
1541                                 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
1542                         os_memcpy(params.filter_ssids[params.num_filter_ssids].ssid,
1543                                   ssid->ssid, ssid->ssid_len);
1544                         params.filter_ssids[params.num_filter_ssids].ssid_len =
1545                                 ssid->ssid_len;
1546                         params.num_filter_ssids++;
1547                 } else if (params.filter_ssids && ssid->ssid && ssid->ssid_len)
1548                 {
1549                         wpa_dbg(wpa_s, MSG_DEBUG, "Not enough room for SSID "
1550                                 "filter for sched_scan - drop filter");
1551                         os_free(params.filter_ssids);
1552                         params.filter_ssids = NULL;
1553                         params.num_filter_ssids = 0;
1554                 }
1555
1556                 if (ssid->scan_ssid && ssid->ssid && ssid->ssid_len) {
1557                         if (params.num_ssids == max_sched_scan_ssids)
1558                                 break; /* only room for broadcast SSID */
1559                         wpa_dbg(wpa_s, MSG_DEBUG,
1560                                 "add to active scan ssid: %s",
1561                                 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
1562                         params.ssids[params.num_ssids].ssid =
1563                                 ssid->ssid;
1564                         params.ssids[params.num_ssids].ssid_len =
1565                                 ssid->ssid_len;
1566                         params.num_ssids++;
1567                         if (params.num_ssids >= max_sched_scan_ssids) {
1568                                 wpa_s->prev_sched_ssid = ssid;
1569                                 do {
1570                                         ssid = ssid->next;
1571                                 } while (ssid &&
1572                                          (wpas_network_disabled(wpa_s, ssid) ||
1573                                           !ssid->scan_ssid));
1574                                 break;
1575                         }
1576                 }
1577
1578         next:
1579                 wpa_s->prev_sched_ssid = ssid;
1580                 ssid = ssid->next;
1581         }
1582
1583         if (params.num_filter_ssids == 0) {
1584                 os_free(params.filter_ssids);
1585                 params.filter_ssids = NULL;
1586         }
1587
1588         extra_ie = wpa_supplicant_extra_ies(wpa_s);
1589         if (extra_ie) {
1590                 params.extra_ies = wpabuf_head(extra_ie);
1591                 params.extra_ies_len = wpabuf_len(extra_ie);
1592         }
1593
1594         if (wpa_s->conf->filter_rssi)
1595                 params.filter_rssi = wpa_s->conf->filter_rssi;
1596
1597         /* See if user specified frequencies. If so, scan only those. */
1598         if (wpa_s->conf->freq_list && !params.freqs) {
1599                 wpa_dbg(wpa_s, MSG_DEBUG,
1600                         "Optimize scan based on conf->freq_list");
1601                 int_array_concat(&params.freqs, wpa_s->conf->freq_list);
1602         }
1603
1604 #ifdef CONFIG_MBO
1605         if (wpa_s->enable_oce & OCE_STA)
1606                 params.oce_scan = 1;
1607 #endif /* CONFIG_MBO */
1608
1609         scan_params = &params;
1610
1611 scan:
1612         wpa_s->sched_scan_timed_out = 0;
1613
1614         /*
1615          * We cannot support multiple scan plans if the scan request includes
1616          * too many SSID's, so in this case use only the last scan plan and make
1617          * it run infinitely. It will be stopped by the timeout.
1618          */
1619         if (wpa_s->sched_scan_plans_num == 1 ||
1620             (wpa_s->sched_scan_plans_num && !ssid && wpa_s->first_sched_scan)) {
1621                 params.sched_scan_plans = wpa_s->sched_scan_plans;
1622                 params.sched_scan_plans_num = wpa_s->sched_scan_plans_num;
1623         } else if (wpa_s->sched_scan_plans_num > 1) {
1624                 wpa_dbg(wpa_s, MSG_DEBUG,
1625                         "Too many SSIDs. Default to using single scheduled_scan plan");
1626                 params.sched_scan_plans =
1627                         &wpa_s->sched_scan_plans[wpa_s->sched_scan_plans_num -
1628                                                  1];
1629                 params.sched_scan_plans_num = 1;
1630         } else {
1631                 if (wpa_s->conf->sched_scan_interval)
1632                         scan_plan.interval = wpa_s->conf->sched_scan_interval;
1633                 else
1634                         scan_plan.interval = 10;
1635
1636                 if (scan_plan.interval > wpa_s->max_sched_scan_plan_interval) {
1637                         wpa_printf(MSG_WARNING,
1638                                    "Scan interval too long(%u), use the maximum allowed(%u)",
1639                                    scan_plan.interval,
1640                                    wpa_s->max_sched_scan_plan_interval);
1641                         scan_plan.interval =
1642                                 wpa_s->max_sched_scan_plan_interval;
1643                 }
1644
1645                 scan_plan.iterations = 0;
1646                 params.sched_scan_plans = &scan_plan;
1647                 params.sched_scan_plans_num = 1;
1648         }
1649
1650         params.sched_scan_start_delay = wpa_s->conf->sched_scan_start_delay;
1651
1652         if (ssid || !wpa_s->first_sched_scan) {
1653                 wpa_dbg(wpa_s, MSG_DEBUG,
1654                         "Starting sched scan after %u seconds: interval %u timeout %d",
1655                         params.sched_scan_start_delay,
1656                         params.sched_scan_plans[0].interval,
1657                         wpa_s->sched_scan_timeout);
1658         } else {
1659                 wpa_dbg(wpa_s, MSG_DEBUG,
1660                         "Starting sched scan after %u seconds (no timeout)",
1661                         params.sched_scan_start_delay);
1662         }
1663
1664         wpa_setband_scan_freqs(wpa_s, scan_params);
1665
1666         if ((wpa_s->mac_addr_rand_enable & MAC_ADDR_RAND_SCHED_SCAN) &&
1667             wpa_s->wpa_state <= WPA_SCANNING) {
1668                 params.mac_addr_rand = 1;
1669                 if (wpa_s->mac_addr_sched_scan) {
1670                         params.mac_addr = wpa_s->mac_addr_sched_scan;
1671                         params.mac_addr_mask = wpa_s->mac_addr_sched_scan +
1672                                 ETH_ALEN;
1673                 }
1674         }
1675
1676         wpa_scan_set_relative_rssi_params(wpa_s, scan_params);
1677
1678         ret = wpa_supplicant_start_sched_scan(wpa_s, scan_params);
1679         wpabuf_free(extra_ie);
1680         os_free(params.filter_ssids);
1681         if (ret) {
1682                 wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate sched scan");
1683                 if (prev_state != wpa_s->wpa_state)
1684                         wpa_supplicant_set_state(wpa_s, prev_state);
1685                 return ret;
1686         }
1687
1688         /* If we have more SSIDs to scan, add a timeout so we scan them too */
1689         if (ssid || !wpa_s->first_sched_scan) {
1690                 wpa_s->sched_scan_timed_out = 0;
1691                 eloop_register_timeout(wpa_s->sched_scan_timeout, 0,
1692                                        wpa_supplicant_sched_scan_timeout,
1693                                        wpa_s, NULL);
1694                 wpa_s->first_sched_scan = 0;
1695                 wpa_s->sched_scan_timeout /= 2;
1696                 params.sched_scan_plans[0].interval *= 2;
1697                 if ((unsigned int) wpa_s->sched_scan_timeout <
1698                     params.sched_scan_plans[0].interval ||
1699                     params.sched_scan_plans[0].interval >
1700                     wpa_s->max_sched_scan_plan_interval) {
1701                         params.sched_scan_plans[0].interval = 10;
1702                         wpa_s->sched_scan_timeout = max_sched_scan_ssids * 2;
1703                 }
1704         }
1705
1706         /* If there is no more ssids, start next time from the beginning */
1707         if (!ssid)
1708                 wpa_s->prev_sched_ssid = NULL;
1709
1710         return 0;
1711 }
1712
1713
1714 /**
1715  * wpa_supplicant_cancel_scan - Cancel a scheduled scan request
1716  * @wpa_s: Pointer to wpa_supplicant data
1717  *
1718  * This function is used to cancel a scan request scheduled with
1719  * wpa_supplicant_req_scan().
1720  */
1721 void wpa_supplicant_cancel_scan(struct wpa_supplicant *wpa_s)
1722 {
1723         wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling scan request");
1724         eloop_cancel_timeout(wpa_supplicant_scan, wpa_s, NULL);
1725 }
1726
1727
1728 /**
1729  * wpa_supplicant_cancel_delayed_sched_scan - Stop a delayed scheduled scan
1730  * @wpa_s: Pointer to wpa_supplicant data
1731  *
1732  * This function is used to stop a delayed scheduled scan.
1733  */
1734 void wpa_supplicant_cancel_delayed_sched_scan(struct wpa_supplicant *wpa_s)
1735 {
1736         if (!wpa_s->sched_scan_supported)
1737                 return;
1738
1739         wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling delayed sched scan");
1740         eloop_cancel_timeout(wpa_supplicant_delayed_sched_scan_timeout,
1741                              wpa_s, NULL);
1742 }
1743
1744
1745 /**
1746  * wpa_supplicant_cancel_sched_scan - Stop running scheduled scans
1747  * @wpa_s: Pointer to wpa_supplicant data
1748  *
1749  * This function is used to stop a periodic scheduled scan.
1750  */
1751 void wpa_supplicant_cancel_sched_scan(struct wpa_supplicant *wpa_s)
1752 {
1753         if (!wpa_s->sched_scanning)
1754                 return;
1755
1756         if (wpa_s->sched_scanning)
1757                 wpa_s->sched_scan_stop_req = 1;
1758
1759         wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling sched scan");
1760         eloop_cancel_timeout(wpa_supplicant_sched_scan_timeout, wpa_s, NULL);
1761         wpa_supplicant_stop_sched_scan(wpa_s);
1762 }
1763
1764
1765 /**
1766  * wpa_supplicant_notify_scanning - Indicate possible scan state change
1767  * @wpa_s: Pointer to wpa_supplicant data
1768  * @scanning: Whether scanning is currently in progress
1769  *
1770  * This function is to generate scanning notifycations. It is called whenever
1771  * there may have been a change in scanning (scan started, completed, stopped).
1772  * wpas_notify_scanning() is called whenever the scanning state changed from the
1773  * previously notified state.
1774  */
1775 void wpa_supplicant_notify_scanning(struct wpa_supplicant *wpa_s,
1776                                     int scanning)
1777 {
1778         if (wpa_s->scanning != scanning) {
1779                 wpa_s->scanning = scanning;
1780                 wpas_notify_scanning(wpa_s);
1781         }
1782 }
1783
1784
1785 static int wpa_scan_get_max_rate(const struct wpa_scan_res *res)
1786 {
1787         int rate = 0;
1788         const u8 *ie;
1789         int i;
1790
1791         ie = wpa_scan_get_ie(res, WLAN_EID_SUPP_RATES);
1792         for (i = 0; ie && i < ie[1]; i++) {
1793                 if ((ie[i + 2] & 0x7f) > rate)
1794                         rate = ie[i + 2] & 0x7f;
1795         }
1796
1797         ie = wpa_scan_get_ie(res, WLAN_EID_EXT_SUPP_RATES);
1798         for (i = 0; ie && i < ie[1]; i++) {
1799                 if ((ie[i + 2] & 0x7f) > rate)
1800                         rate = ie[i + 2] & 0x7f;
1801         }
1802
1803         return rate;
1804 }
1805
1806
1807 /**
1808  * wpa_scan_get_ie - Fetch a specified information element from a scan result
1809  * @res: Scan result entry
1810  * @ie: Information element identitifier (WLAN_EID_*)
1811  * Returns: Pointer to the information element (id field) or %NULL if not found
1812  *
1813  * This function returns the first matching information element in the scan
1814  * result.
1815  */
1816 const u8 * wpa_scan_get_ie(const struct wpa_scan_res *res, u8 ie)
1817 {
1818         size_t ie_len = res->ie_len;
1819
1820         /* Use the Beacon frame IEs if res->ie_len is not available */
1821         if (!ie_len)
1822                 ie_len = res->beacon_ie_len;
1823
1824         return get_ie((const u8 *) (res + 1), ie_len, ie);
1825 }
1826
1827
1828 /**
1829  * wpa_scan_get_vendor_ie - Fetch vendor information element from a scan result
1830  * @res: Scan result entry
1831  * @vendor_type: Vendor type (four octets starting the IE payload)
1832  * Returns: Pointer to the information element (id field) or %NULL if not found
1833  *
1834  * This function returns the first matching information element in the scan
1835  * result.
1836  */
1837 const u8 * wpa_scan_get_vendor_ie(const struct wpa_scan_res *res,
1838                                   u32 vendor_type)
1839 {
1840         const u8 *end, *pos;
1841
1842         pos = (const u8 *) (res + 1);
1843         end = pos + res->ie_len;
1844
1845         while (end - pos > 1) {
1846                 if (2 + pos[1] > end - pos)
1847                         break;
1848                 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1849                     vendor_type == WPA_GET_BE32(&pos[2]))
1850                         return pos;
1851                 pos += 2 + pos[1];
1852         }
1853
1854         return NULL;
1855 }
1856
1857
1858 /**
1859  * wpa_scan_get_vendor_ie_beacon - Fetch vendor information from a scan result
1860  * @res: Scan result entry
1861  * @vendor_type: Vendor type (four octets starting the IE payload)
1862  * Returns: Pointer to the information element (id field) or %NULL if not found
1863  *
1864  * This function returns the first matching information element in the scan
1865  * result.
1866  *
1867  * This function is like wpa_scan_get_vendor_ie(), but uses IE buffer only
1868  * from Beacon frames instead of either Beacon or Probe Response frames.
1869  */
1870 const u8 * wpa_scan_get_vendor_ie_beacon(const struct wpa_scan_res *res,
1871                                          u32 vendor_type)
1872 {
1873         const u8 *end, *pos;
1874
1875         if (res->beacon_ie_len == 0)
1876                 return NULL;
1877
1878         pos = (const u8 *) (res + 1);
1879         pos += res->ie_len;
1880         end = pos + res->beacon_ie_len;
1881
1882         while (end - pos > 1) {
1883                 if (2 + pos[1] > end - pos)
1884                         break;
1885                 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1886                     vendor_type == WPA_GET_BE32(&pos[2]))
1887                         return pos;
1888                 pos += 2 + pos[1];
1889         }
1890
1891         return NULL;
1892 }
1893
1894
1895 /**
1896  * wpa_scan_get_vendor_ie_multi - Fetch vendor IE data from a scan result
1897  * @res: Scan result entry
1898  * @vendor_type: Vendor type (four octets starting the IE payload)
1899  * Returns: Pointer to the information element payload or %NULL if not found
1900  *
1901  * This function returns concatenated payload of possibly fragmented vendor
1902  * specific information elements in the scan result. The caller is responsible
1903  * for freeing the returned buffer.
1904  */
1905 struct wpabuf * wpa_scan_get_vendor_ie_multi(const struct wpa_scan_res *res,
1906                                              u32 vendor_type)
1907 {
1908         struct wpabuf *buf;
1909         const u8 *end, *pos;
1910
1911         buf = wpabuf_alloc(res->ie_len);
1912         if (buf == NULL)
1913                 return NULL;
1914
1915         pos = (const u8 *) (res + 1);
1916         end = pos + res->ie_len;
1917
1918         while (end - pos > 1) {
1919                 if (2 + pos[1] > end - pos)
1920                         break;
1921                 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1922                     vendor_type == WPA_GET_BE32(&pos[2]))
1923                         wpabuf_put_data(buf, pos + 2 + 4, pos[1] - 4);
1924                 pos += 2 + pos[1];
1925         }
1926
1927         if (wpabuf_len(buf) == 0) {
1928                 wpabuf_free(buf);
1929                 buf = NULL;
1930         }
1931
1932         return buf;
1933 }
1934
1935
1936 /*
1937  * Channels with a great SNR can operate at full rate. What is a great SNR?
1938  * This doc https://supportforums.cisco.com/docs/DOC-12954 says, "the general
1939  * rule of thumb is that any SNR above 20 is good." This one
1940  * http://www.cisco.com/en/US/tech/tk722/tk809/technologies_q_and_a_item09186a00805e9a96.shtml#qa23
1941  * recommends 25 as a minimum SNR for 54 Mbps data rate. The estimates used in
1942  * scan_est_throughput() allow even smaller SNR values for the maximum rates
1943  * (21 for 54 Mbps, 22 for VHT80 MCS9, 24 for HT40 and HT20 MCS7). Use 25 as a
1944  * somewhat conservative value here.
1945  */
1946 #define GREAT_SNR 25
1947
1948 #define IS_5GHZ(n) (n > 4000)
1949
1950 /* Compare function for sorting scan results. Return >0 if @b is considered
1951  * better. */
1952 static int wpa_scan_result_compar(const void *a, const void *b)
1953 {
1954 #define MIN(a,b) a < b ? a : b
1955         struct wpa_scan_res **_wa = (void *) a;
1956         struct wpa_scan_res **_wb = (void *) b;
1957         struct wpa_scan_res *wa = *_wa;
1958         struct wpa_scan_res *wb = *_wb;
1959         int wpa_a, wpa_b;
1960         int snr_a, snr_b, snr_a_full, snr_b_full;
1961
1962         /* WPA/WPA2 support preferred */
1963         wpa_a = wpa_scan_get_vendor_ie(wa, WPA_IE_VENDOR_TYPE) != NULL ||
1964                 wpa_scan_get_ie(wa, WLAN_EID_RSN) != NULL;
1965         wpa_b = wpa_scan_get_vendor_ie(wb, WPA_IE_VENDOR_TYPE) != NULL ||
1966                 wpa_scan_get_ie(wb, WLAN_EID_RSN) != NULL;
1967
1968         if (wpa_b && !wpa_a)
1969                 return 1;
1970         if (!wpa_b && wpa_a)
1971                 return -1;
1972
1973         /* privacy support preferred */
1974         if ((wa->caps & IEEE80211_CAP_PRIVACY) == 0 &&
1975             (wb->caps & IEEE80211_CAP_PRIVACY))
1976                 return 1;
1977         if ((wa->caps & IEEE80211_CAP_PRIVACY) &&
1978             (wb->caps & IEEE80211_CAP_PRIVACY) == 0)
1979                 return -1;
1980
1981         if (wa->flags & wb->flags & WPA_SCAN_LEVEL_DBM) {
1982                 snr_a_full = wa->snr;
1983                 snr_a = MIN(wa->snr, GREAT_SNR);
1984                 snr_b_full = wb->snr;
1985                 snr_b = MIN(wb->snr, GREAT_SNR);
1986         } else {
1987                 /* Level is not in dBm, so we can't calculate
1988                  * SNR. Just use raw level (units unknown). */
1989                 snr_a = snr_a_full = wa->level;
1990                 snr_b = snr_b_full = wb->level;
1991         }
1992
1993         /* if SNR is close, decide by max rate or frequency band */
1994         if (snr_a && snr_b && abs(snr_b - snr_a) < 7) {
1995                 if (wa->est_throughput != wb->est_throughput)
1996                         return (int) wb->est_throughput -
1997                                 (int) wa->est_throughput;
1998         }
1999         if ((snr_a && snr_b && abs(snr_b - snr_a) < 5) ||
2000             (wa->qual && wb->qual && abs(wb->qual - wa->qual) < 10)) {
2001                 if (IS_5GHZ(wa->freq) ^ IS_5GHZ(wb->freq))
2002                         return IS_5GHZ(wa->freq) ? -1 : 1;
2003         }
2004
2005         /* all things being equal, use SNR; if SNRs are
2006          * identical, use quality values since some drivers may only report
2007          * that value and leave the signal level zero */
2008         if (snr_b_full == snr_a_full)
2009                 return wb->qual - wa->qual;
2010         return snr_b_full - snr_a_full;
2011 #undef MIN
2012 }
2013
2014
2015 #ifdef CONFIG_WPS
2016 /* Compare function for sorting scan results when searching a WPS AP for
2017  * provisioning. Return >0 if @b is considered better. */
2018 static int wpa_scan_result_wps_compar(const void *a, const void *b)
2019 {
2020         struct wpa_scan_res **_wa = (void *) a;
2021         struct wpa_scan_res **_wb = (void *) b;
2022         struct wpa_scan_res *wa = *_wa;
2023         struct wpa_scan_res *wb = *_wb;
2024         int uses_wps_a, uses_wps_b;
2025         struct wpabuf *wps_a, *wps_b;
2026         int res;
2027
2028         /* Optimization - check WPS IE existence before allocated memory and
2029          * doing full reassembly. */
2030         uses_wps_a = wpa_scan_get_vendor_ie(wa, WPS_IE_VENDOR_TYPE) != NULL;
2031         uses_wps_b = wpa_scan_get_vendor_ie(wb, WPS_IE_VENDOR_TYPE) != NULL;
2032         if (uses_wps_a && !uses_wps_b)
2033                 return -1;
2034         if (!uses_wps_a && uses_wps_b)
2035                 return 1;
2036
2037         if (uses_wps_a && uses_wps_b) {
2038                 wps_a = wpa_scan_get_vendor_ie_multi(wa, WPS_IE_VENDOR_TYPE);
2039                 wps_b = wpa_scan_get_vendor_ie_multi(wb, WPS_IE_VENDOR_TYPE);
2040                 res = wps_ap_priority_compar(wps_a, wps_b);
2041                 wpabuf_free(wps_a);
2042                 wpabuf_free(wps_b);
2043                 if (res)
2044                         return res;
2045         }
2046
2047         /*
2048          * Do not use current AP security policy as a sorting criteria during
2049          * WPS provisioning step since the AP may get reconfigured at the
2050          * completion of provisioning.
2051          */
2052
2053         /* all things being equal, use signal level; if signal levels are
2054          * identical, use quality values since some drivers may only report
2055          * that value and leave the signal level zero */
2056         if (wb->level == wa->level)
2057                 return wb->qual - wa->qual;
2058         return wb->level - wa->level;
2059 }
2060 #endif /* CONFIG_WPS */
2061
2062
2063 static void dump_scan_res(struct wpa_scan_results *scan_res)
2064 {
2065 #ifndef CONFIG_NO_STDOUT_DEBUG
2066         size_t i;
2067
2068         if (scan_res->res == NULL || scan_res->num == 0)
2069                 return;
2070
2071         wpa_printf(MSG_EXCESSIVE, "Sorted scan results");
2072
2073         for (i = 0; i < scan_res->num; i++) {
2074                 struct wpa_scan_res *r = scan_res->res[i];
2075                 u8 *pos;
2076                 if (r->flags & WPA_SCAN_LEVEL_DBM) {
2077                         int noise_valid = !(r->flags & WPA_SCAN_NOISE_INVALID);
2078
2079                         wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d "
2080                                    "noise=%d%s level=%d snr=%d%s flags=0x%x age=%u est=%u",
2081                                    MAC2STR(r->bssid), r->freq, r->qual,
2082                                    r->noise, noise_valid ? "" : "~", r->level,
2083                                    r->snr, r->snr >= GREAT_SNR ? "*" : "",
2084                                    r->flags,
2085                                    r->age, r->est_throughput);
2086                 } else {
2087                         wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d "
2088                                    "noise=%d level=%d flags=0x%x age=%u est=%u",
2089                                    MAC2STR(r->bssid), r->freq, r->qual,
2090                                    r->noise, r->level, r->flags, r->age,
2091                                    r->est_throughput);
2092                 }
2093                 pos = (u8 *) (r + 1);
2094                 if (r->ie_len)
2095                         wpa_hexdump(MSG_EXCESSIVE, "IEs", pos, r->ie_len);
2096                 pos += r->ie_len;
2097                 if (r->beacon_ie_len)
2098                         wpa_hexdump(MSG_EXCESSIVE, "Beacon IEs",
2099                                     pos, r->beacon_ie_len);
2100         }
2101 #endif /* CONFIG_NO_STDOUT_DEBUG */
2102 }
2103
2104
2105 /**
2106  * wpa_supplicant_filter_bssid_match - Is the specified BSSID allowed
2107  * @wpa_s: Pointer to wpa_supplicant data
2108  * @bssid: BSSID to check
2109  * Returns: 0 if the BSSID is filtered or 1 if not
2110  *
2111  * This function is used to filter out specific BSSIDs from scan reslts mainly
2112  * for testing purposes (SET bssid_filter ctrl_iface command).
2113  */
2114 int wpa_supplicant_filter_bssid_match(struct wpa_supplicant *wpa_s,
2115                                       const u8 *bssid)
2116 {
2117         size_t i;
2118
2119         if (wpa_s->bssid_filter == NULL)
2120                 return 1;
2121
2122         for (i = 0; i < wpa_s->bssid_filter_count; i++) {
2123                 if (os_memcmp(wpa_s->bssid_filter + i * ETH_ALEN, bssid,
2124                               ETH_ALEN) == 0)
2125                         return 1;
2126         }
2127
2128         return 0;
2129 }
2130
2131
2132 void filter_scan_res(struct wpa_supplicant *wpa_s,
2133                      struct wpa_scan_results *res)
2134 {
2135         size_t i, j;
2136
2137         if (wpa_s->bssid_filter == NULL)
2138                 return;
2139
2140         for (i = 0, j = 0; i < res->num; i++) {
2141                 if (wpa_supplicant_filter_bssid_match(wpa_s,
2142                                                       res->res[i]->bssid)) {
2143                         res->res[j++] = res->res[i];
2144                 } else {
2145                         os_free(res->res[i]);
2146                         res->res[i] = NULL;
2147                 }
2148         }
2149
2150         if (res->num != j) {
2151                 wpa_printf(MSG_DEBUG, "Filtered out %d scan results",
2152                            (int) (res->num - j));
2153                 res->num = j;
2154         }
2155 }
2156
2157
2158 /*
2159  * Noise floor values to use when we have signal strength
2160  * measurements, but no noise floor measurements. These values were
2161  * measured in an office environment with many APs.
2162  */
2163 #define DEFAULT_NOISE_FLOOR_2GHZ (-89)
2164 #define DEFAULT_NOISE_FLOOR_5GHZ (-92)
2165
2166 void scan_snr(struct wpa_scan_res *res)
2167 {
2168         if (res->flags & WPA_SCAN_NOISE_INVALID) {
2169                 res->noise = IS_5GHZ(res->freq) ?
2170                         DEFAULT_NOISE_FLOOR_5GHZ :
2171                         DEFAULT_NOISE_FLOOR_2GHZ;
2172         }
2173
2174         if (res->flags & WPA_SCAN_LEVEL_DBM) {
2175                 res->snr = res->level - res->noise;
2176         } else {
2177                 /* Level is not in dBm, so we can't calculate
2178                  * SNR. Just use raw level (units unknown). */
2179                 res->snr = res->level;
2180         }
2181 }
2182
2183
2184 static unsigned int max_ht20_rate(int snr)
2185 {
2186         if (snr < 6)
2187                 return 6500; /* HT20 MCS0 */
2188         if (snr < 8)
2189                 return 13000; /* HT20 MCS1 */
2190         if (snr < 13)
2191                 return 19500; /* HT20 MCS2 */
2192         if (snr < 17)
2193                 return 26000; /* HT20 MCS3 */
2194         if (snr < 20)
2195                 return 39000; /* HT20 MCS4 */
2196         if (snr < 23)
2197                 return 52000; /* HT20 MCS5 */
2198         if (snr < 24)
2199                 return 58500; /* HT20 MCS6 */
2200         return 65000; /* HT20 MCS7 */
2201 }
2202
2203
2204 static unsigned int max_ht40_rate(int snr)
2205 {
2206         if (snr < 3)
2207                 return 13500; /* HT40 MCS0 */
2208         if (snr < 6)
2209                 return 27000; /* HT40 MCS1 */
2210         if (snr < 10)
2211                 return 40500; /* HT40 MCS2 */
2212         if (snr < 15)
2213                 return 54000; /* HT40 MCS3 */
2214         if (snr < 17)
2215                 return 81000; /* HT40 MCS4 */
2216         if (snr < 22)
2217                 return 108000; /* HT40 MCS5 */
2218         if (snr < 24)
2219                 return 121500; /* HT40 MCS6 */
2220         return 135000; /* HT40 MCS7 */
2221 }
2222
2223
2224 static unsigned int max_vht80_rate(int snr)
2225 {
2226         if (snr < 1)
2227                 return 0;
2228         if (snr < 2)
2229                 return 29300; /* VHT80 MCS0 */
2230         if (snr < 5)
2231                 return 58500; /* VHT80 MCS1 */
2232         if (snr < 9)
2233                 return 87800; /* VHT80 MCS2 */
2234         if (snr < 11)
2235                 return 117000; /* VHT80 MCS3 */
2236         if (snr < 15)
2237                 return 175500; /* VHT80 MCS4 */
2238         if (snr < 16)
2239                 return 234000; /* VHT80 MCS5 */
2240         if (snr < 18)
2241                 return 263300; /* VHT80 MCS6 */
2242         if (snr < 20)
2243                 return 292500; /* VHT80 MCS7 */
2244         if (snr < 22)
2245                 return 351000; /* VHT80 MCS8 */
2246         return 390000; /* VHT80 MCS9 */
2247 }
2248
2249
2250 void scan_est_throughput(struct wpa_supplicant *wpa_s,
2251                          struct wpa_scan_res *res)
2252 {
2253         enum local_hw_capab capab = wpa_s->hw_capab;
2254         int rate; /* max legacy rate in 500 kb/s units */
2255         const u8 *ie;
2256         unsigned int est, tmp;
2257         int snr = res->snr;
2258
2259         if (res->est_throughput)
2260                 return;
2261
2262         /* Get maximum legacy rate */
2263         rate = wpa_scan_get_max_rate(res);
2264
2265         /* Limit based on estimated SNR */
2266         if (rate > 1 * 2 && snr < 1)
2267                 rate = 1 * 2;
2268         else if (rate > 2 * 2 && snr < 4)
2269                 rate = 2 * 2;
2270         else if (rate > 6 * 2 && snr < 5)
2271                 rate = 6 * 2;
2272         else if (rate > 9 * 2 && snr < 6)
2273                 rate = 9 * 2;
2274         else if (rate > 12 * 2 && snr < 7)
2275                 rate = 12 * 2;
2276         else if (rate > 18 * 2 && snr < 10)
2277                 rate = 18 * 2;
2278         else if (rate > 24 * 2 && snr < 11)
2279                 rate = 24 * 2;
2280         else if (rate > 36 * 2 && snr < 15)
2281                 rate = 36 * 2;
2282         else if (rate > 48 * 2 && snr < 19)
2283                 rate = 48 * 2;
2284         else if (rate > 54 * 2 && snr < 21)
2285                 rate = 54 * 2;
2286         est = rate * 500;
2287
2288         if (capab == CAPAB_HT || capab == CAPAB_HT40 || capab == CAPAB_VHT) {
2289                 ie = wpa_scan_get_ie(res, WLAN_EID_HT_CAP);
2290                 if (ie) {
2291                         tmp = max_ht20_rate(snr);
2292                         if (tmp > est)
2293                                 est = tmp;
2294                 }
2295         }
2296
2297         if (capab == CAPAB_HT40 || capab == CAPAB_VHT) {
2298                 ie = wpa_scan_get_ie(res, WLAN_EID_HT_OPERATION);
2299                 if (ie && ie[1] >= 2 &&
2300                     (ie[3] & HT_INFO_HT_PARAM_SECONDARY_CHNL_OFF_MASK)) {
2301                         tmp = max_ht40_rate(snr);
2302                         if (tmp > est)
2303                                 est = tmp;
2304                 }
2305         }
2306
2307         if (capab == CAPAB_VHT) {
2308                 /* Use +1 to assume VHT is always faster than HT */
2309                 ie = wpa_scan_get_ie(res, WLAN_EID_VHT_CAP);
2310                 if (ie) {
2311                         tmp = max_ht20_rate(snr) + 1;
2312                         if (tmp > est)
2313                                 est = tmp;
2314
2315                         ie = wpa_scan_get_ie(res, WLAN_EID_HT_OPERATION);
2316                         if (ie && ie[1] >= 2 &&
2317                             (ie[3] &
2318                              HT_INFO_HT_PARAM_SECONDARY_CHNL_OFF_MASK)) {
2319                                 tmp = max_ht40_rate(snr) + 1;
2320                                 if (tmp > est)
2321                                         est = tmp;
2322                         }
2323
2324                         ie = wpa_scan_get_ie(res, WLAN_EID_VHT_OPERATION);
2325                         if (ie && ie[1] >= 1 &&
2326                             (ie[2] & VHT_OPMODE_CHANNEL_WIDTH_MASK)) {
2327                                 tmp = max_vht80_rate(snr) + 1;
2328                                 if (tmp > est)
2329                                         est = tmp;
2330                         }
2331                 }
2332         }
2333
2334         /* TODO: channel utilization and AP load (e.g., from AP Beacon) */
2335
2336         res->est_throughput = est;
2337 }
2338
2339
2340 /**
2341  * wpa_supplicant_get_scan_results - Get scan results
2342  * @wpa_s: Pointer to wpa_supplicant data
2343  * @info: Information about what was scanned or %NULL if not available
2344  * @new_scan: Whether a new scan was performed
2345  * Returns: Scan results, %NULL on failure
2346  *
2347  * This function request the current scan results from the driver and updates
2348  * the local BSS list wpa_s->bss. The caller is responsible for freeing the
2349  * results with wpa_scan_results_free().
2350  */
2351 struct wpa_scan_results *
2352 wpa_supplicant_get_scan_results(struct wpa_supplicant *wpa_s,
2353                                 struct scan_info *info, int new_scan)
2354 {
2355         struct wpa_scan_results *scan_res;
2356         size_t i;
2357         int (*compar)(const void *, const void *) = wpa_scan_result_compar;
2358
2359         scan_res = wpa_drv_get_scan_results2(wpa_s);
2360         if (scan_res == NULL) {
2361                 wpa_dbg(wpa_s, MSG_DEBUG, "Failed to get scan results");
2362                 return NULL;
2363         }
2364         if (scan_res->fetch_time.sec == 0) {
2365                 /*
2366                  * Make sure we have a valid timestamp if the driver wrapper
2367                  * does not set this.
2368                  */
2369                 os_get_reltime(&scan_res->fetch_time);
2370         }
2371         filter_scan_res(wpa_s, scan_res);
2372
2373         for (i = 0; i < scan_res->num; i++) {
2374                 struct wpa_scan_res *scan_res_item = scan_res->res[i];
2375
2376                 scan_snr(scan_res_item);
2377                 scan_est_throughput(wpa_s, scan_res_item);
2378         }
2379
2380 #ifdef CONFIG_WPS
2381         if (wpas_wps_searching(wpa_s)) {
2382                 wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Order scan results with WPS "
2383                         "provisioning rules");
2384                 compar = wpa_scan_result_wps_compar;
2385         }
2386 #endif /* CONFIG_WPS */
2387
2388         if (scan_res->res) {
2389                 qsort(scan_res->res, scan_res->num,
2390                       sizeof(struct wpa_scan_res *), compar);
2391         }
2392         dump_scan_res(scan_res);
2393
2394         if (wpa_s->ignore_post_flush_scan_res) {
2395                 /* FLUSH command aborted an ongoing scan and these are the
2396                  * results from the aborted scan. Do not process the results to
2397                  * maintain flushed state. */
2398                 wpa_dbg(wpa_s, MSG_DEBUG,
2399                         "Do not update BSS table based on pending post-FLUSH scan results");
2400                 wpa_s->ignore_post_flush_scan_res = 0;
2401                 return scan_res;
2402         }
2403
2404         wpa_bss_update_start(wpa_s);
2405         for (i = 0; i < scan_res->num; i++)
2406                 wpa_bss_update_scan_res(wpa_s, scan_res->res[i],
2407                                         &scan_res->fetch_time);
2408         wpa_bss_update_end(wpa_s, info, new_scan);
2409
2410         return scan_res;
2411 }
2412
2413
2414 /**
2415  * wpa_supplicant_update_scan_results - Update scan results from the driver
2416  * @wpa_s: Pointer to wpa_supplicant data
2417  * Returns: 0 on success, -1 on failure
2418  *
2419  * This function updates the BSS table within wpa_supplicant based on the
2420  * currently available scan results from the driver without requesting a new
2421  * scan. This is used in cases where the driver indicates an association
2422  * (including roaming within ESS) and wpa_supplicant does not yet have the
2423  * needed information to complete the connection (e.g., to perform validation
2424  * steps in 4-way handshake).
2425  */
2426 int wpa_supplicant_update_scan_results(struct wpa_supplicant *wpa_s)
2427 {
2428         struct wpa_scan_results *scan_res;
2429         scan_res = wpa_supplicant_get_scan_results(wpa_s, NULL, 0);
2430         if (scan_res == NULL)
2431                 return -1;
2432         wpa_scan_results_free(scan_res);
2433
2434         return 0;
2435 }
2436
2437
2438 /**
2439  * scan_only_handler - Reports scan results
2440  */
2441 void scan_only_handler(struct wpa_supplicant *wpa_s,
2442                        struct wpa_scan_results *scan_res)
2443 {
2444         wpa_dbg(wpa_s, MSG_DEBUG, "Scan-only results received");
2445         if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
2446             wpa_s->manual_scan_use_id && wpa_s->own_scan_running) {
2447                 wpa_msg_ctrl(wpa_s, MSG_INFO, WPA_EVENT_SCAN_RESULTS "id=%u",
2448                              wpa_s->manual_scan_id);
2449                 wpa_s->manual_scan_use_id = 0;
2450         } else {
2451                 wpa_msg_ctrl(wpa_s, MSG_INFO, WPA_EVENT_SCAN_RESULTS);
2452         }
2453         wpas_notify_scan_results(wpa_s);
2454         wpas_notify_scan_done(wpa_s, 1);
2455         if (wpa_s->scan_work) {
2456                 struct wpa_radio_work *work = wpa_s->scan_work;
2457                 wpa_s->scan_work = NULL;
2458                 radio_work_done(work);
2459         }
2460
2461         if (wpa_s->wpa_state == WPA_SCANNING)
2462                 wpa_supplicant_set_state(wpa_s, wpa_s->scan_prev_wpa_state);
2463 }
2464
2465
2466 int wpas_scan_scheduled(struct wpa_supplicant *wpa_s)
2467 {
2468         return eloop_is_timeout_registered(wpa_supplicant_scan, wpa_s, NULL);
2469 }
2470
2471
2472 struct wpa_driver_scan_params *
2473 wpa_scan_clone_params(const struct wpa_driver_scan_params *src)
2474 {
2475         struct wpa_driver_scan_params *params;
2476         size_t i;
2477         u8 *n;
2478
2479         params = os_zalloc(sizeof(*params));
2480         if (params == NULL)
2481                 return NULL;
2482
2483         for (i = 0; i < src->num_ssids; i++) {
2484                 if (src->ssids[i].ssid) {
2485                         n = os_memdup(src->ssids[i].ssid,
2486                                       src->ssids[i].ssid_len);
2487                         if (n == NULL)
2488                                 goto failed;
2489                         params->ssids[i].ssid = n;
2490                         params->ssids[i].ssid_len = src->ssids[i].ssid_len;
2491                 }
2492         }
2493         params->num_ssids = src->num_ssids;
2494
2495         if (src->extra_ies) {
2496                 n = os_memdup(src->extra_ies, src->extra_ies_len);
2497                 if (n == NULL)
2498                         goto failed;
2499                 params->extra_ies = n;
2500                 params->extra_ies_len = src->extra_ies_len;
2501         }
2502
2503         if (src->freqs) {
2504                 int len = int_array_len(src->freqs);
2505                 params->freqs = os_memdup(src->freqs, (len + 1) * sizeof(int));
2506                 if (params->freqs == NULL)
2507                         goto failed;
2508         }
2509
2510         if (src->filter_ssids) {
2511                 params->filter_ssids = os_memdup(src->filter_ssids,
2512                                                  sizeof(*params->filter_ssids) *
2513                                                  src->num_filter_ssids);
2514                 if (params->filter_ssids == NULL)
2515                         goto failed;
2516                 params->num_filter_ssids = src->num_filter_ssids;
2517         }
2518
2519         params->filter_rssi = src->filter_rssi;
2520         params->p2p_probe = src->p2p_probe;
2521         params->only_new_results = src->only_new_results;
2522         params->low_priority = src->low_priority;
2523         params->duration = src->duration;
2524         params->duration_mandatory = src->duration_mandatory;
2525         params->oce_scan = src->oce_scan;
2526
2527         if (src->sched_scan_plans_num > 0) {
2528                 params->sched_scan_plans =
2529                         os_memdup(src->sched_scan_plans,
2530                                   sizeof(*src->sched_scan_plans) *
2531                                   src->sched_scan_plans_num);
2532                 if (!params->sched_scan_plans)
2533                         goto failed;
2534
2535                 params->sched_scan_plans_num = src->sched_scan_plans_num;
2536         }
2537
2538         if (src->mac_addr_rand) {
2539                 params->mac_addr_rand = src->mac_addr_rand;
2540
2541                 if (src->mac_addr && src->mac_addr_mask) {
2542                         u8 *mac_addr;
2543
2544                         mac_addr = os_malloc(2 * ETH_ALEN);
2545                         if (!mac_addr)
2546                                 goto failed;
2547
2548                         os_memcpy(mac_addr, src->mac_addr, ETH_ALEN);
2549                         os_memcpy(mac_addr + ETH_ALEN, src->mac_addr_mask,
2550                                   ETH_ALEN);
2551                         params->mac_addr = mac_addr;
2552                         params->mac_addr_mask = mac_addr + ETH_ALEN;
2553                 }
2554         }
2555
2556         if (src->bssid) {
2557                 u8 *bssid;
2558
2559                 bssid = os_memdup(src->bssid, ETH_ALEN);
2560                 if (!bssid)
2561                         goto failed;
2562                 params->bssid = bssid;
2563         }
2564
2565         params->relative_rssi_set = src->relative_rssi_set;
2566         params->relative_rssi = src->relative_rssi;
2567         params->relative_adjust_band = src->relative_adjust_band;
2568         params->relative_adjust_rssi = src->relative_adjust_rssi;
2569         return params;
2570
2571 failed:
2572         wpa_scan_free_params(params);
2573         return NULL;
2574 }
2575
2576
2577 void wpa_scan_free_params(struct wpa_driver_scan_params *params)
2578 {
2579         size_t i;
2580
2581         if (params == NULL)
2582                 return;
2583
2584         for (i = 0; i < params->num_ssids; i++)
2585                 os_free((u8 *) params->ssids[i].ssid);
2586         os_free((u8 *) params->extra_ies);
2587         os_free(params->freqs);
2588         os_free(params->filter_ssids);
2589         os_free(params->sched_scan_plans);
2590
2591         /*
2592          * Note: params->mac_addr_mask points to same memory allocation and
2593          * must not be freed separately.
2594          */
2595         os_free((u8 *) params->mac_addr);
2596
2597         os_free((u8 *) params->bssid);
2598
2599         os_free(params);
2600 }
2601
2602
2603 int wpas_start_pno(struct wpa_supplicant *wpa_s)
2604 {
2605         int ret, prio;
2606         size_t i, num_ssid, num_match_ssid;
2607         struct wpa_ssid *ssid;
2608         struct wpa_driver_scan_params params;
2609         struct sched_scan_plan scan_plan;
2610         unsigned int max_sched_scan_ssids;
2611
2612         if (!wpa_s->sched_scan_supported)
2613                 return -1;
2614
2615         if (wpa_s->max_sched_scan_ssids > WPAS_MAX_SCAN_SSIDS)
2616                 max_sched_scan_ssids = WPAS_MAX_SCAN_SSIDS;
2617         else
2618                 max_sched_scan_ssids = wpa_s->max_sched_scan_ssids;
2619         if (max_sched_scan_ssids < 1)
2620                 return -1;
2621
2622         if (wpa_s->pno || wpa_s->pno_sched_pending)
2623                 return 0;
2624
2625         if ((wpa_s->wpa_state > WPA_SCANNING) &&
2626             (wpa_s->wpa_state < WPA_COMPLETED)) {
2627                 wpa_printf(MSG_ERROR, "PNO: In assoc process");
2628                 return -EAGAIN;
2629         }
2630
2631         if (wpa_s->wpa_state == WPA_SCANNING) {
2632                 wpa_supplicant_cancel_scan(wpa_s);
2633                 if (wpa_s->sched_scanning) {
2634                         wpa_printf(MSG_DEBUG, "Schedule PNO on completion of "
2635                                    "ongoing sched scan");
2636                         wpa_supplicant_cancel_sched_scan(wpa_s);
2637                         wpa_s->pno_sched_pending = 1;
2638                         return 0;
2639                 }
2640         }
2641
2642         if (wpa_s->sched_scan_stop_req) {
2643                 wpa_printf(MSG_DEBUG,
2644                            "Schedule PNO after previous sched scan has stopped");
2645                 wpa_s->pno_sched_pending = 1;
2646                 return 0;
2647         }
2648
2649         os_memset(&params, 0, sizeof(params));
2650
2651         num_ssid = num_match_ssid = 0;
2652         ssid = wpa_s->conf->ssid;
2653         while (ssid) {
2654                 if (!wpas_network_disabled(wpa_s, ssid)) {
2655                         num_match_ssid++;
2656                         if (ssid->scan_ssid)
2657                                 num_ssid++;
2658                 }
2659                 ssid = ssid->next;
2660         }
2661
2662         if (num_match_ssid == 0) {
2663                 wpa_printf(MSG_DEBUG, "PNO: No configured SSIDs");
2664                 return -1;
2665         }
2666
2667         if (num_match_ssid > num_ssid) {
2668                 params.num_ssids++; /* wildcard */
2669                 num_ssid++;
2670         }
2671
2672         if (num_ssid > max_sched_scan_ssids) {
2673                 wpa_printf(MSG_DEBUG, "PNO: Use only the first %u SSIDs from "
2674                            "%u", max_sched_scan_ssids, (unsigned int) num_ssid);
2675                 num_ssid = max_sched_scan_ssids;
2676         }
2677
2678         if (num_match_ssid > wpa_s->max_match_sets) {
2679                 num_match_ssid = wpa_s->max_match_sets;
2680                 wpa_dbg(wpa_s, MSG_DEBUG, "PNO: Too many SSIDs to match");
2681         }
2682         params.filter_ssids = os_calloc(num_match_ssid,
2683                                         sizeof(struct wpa_driver_scan_filter));
2684         if (params.filter_ssids == NULL)
2685                 return -1;
2686
2687         i = 0;
2688         prio = 0;
2689         ssid = wpa_s->conf->pssid[prio];
2690         while (ssid) {
2691                 if (!wpas_network_disabled(wpa_s, ssid)) {
2692                         if (ssid->scan_ssid && params.num_ssids < num_ssid) {
2693                                 params.ssids[params.num_ssids].ssid =
2694                                         ssid->ssid;
2695                                 params.ssids[params.num_ssids].ssid_len =
2696                                          ssid->ssid_len;
2697                                 params.num_ssids++;
2698                         }
2699                         os_memcpy(params.filter_ssids[i].ssid, ssid->ssid,
2700                                   ssid->ssid_len);
2701                         params.filter_ssids[i].ssid_len = ssid->ssid_len;
2702                         params.num_filter_ssids++;
2703                         i++;
2704                         if (i == num_match_ssid)
2705                                 break;
2706                 }
2707                 if (ssid->pnext)
2708                         ssid = ssid->pnext;
2709                 else if (prio + 1 == wpa_s->conf->num_prio)
2710                         break;
2711                 else
2712                         ssid = wpa_s->conf->pssid[++prio];
2713         }
2714
2715         if (wpa_s->conf->filter_rssi)
2716                 params.filter_rssi = wpa_s->conf->filter_rssi;
2717
2718         if (wpa_s->sched_scan_plans_num) {
2719                 params.sched_scan_plans = wpa_s->sched_scan_plans;
2720                 params.sched_scan_plans_num = wpa_s->sched_scan_plans_num;
2721         } else {
2722                 /* Set one scan plan that will run infinitely */
2723                 if (wpa_s->conf->sched_scan_interval)
2724                         scan_plan.interval = wpa_s->conf->sched_scan_interval;
2725                 else
2726                         scan_plan.interval = 10;
2727
2728                 scan_plan.iterations = 0;
2729                 params.sched_scan_plans = &scan_plan;
2730                 params.sched_scan_plans_num = 1;
2731         }
2732
2733         params.sched_scan_start_delay = wpa_s->conf->sched_scan_start_delay;
2734
2735         if (params.freqs == NULL && wpa_s->manual_sched_scan_freqs) {
2736                 wpa_dbg(wpa_s, MSG_DEBUG, "Limit sched scan to specified channels");
2737                 params.freqs = wpa_s->manual_sched_scan_freqs;
2738         }
2739
2740         if ((wpa_s->mac_addr_rand_enable & MAC_ADDR_RAND_PNO) &&
2741             wpa_s->wpa_state <= WPA_SCANNING) {
2742                 params.mac_addr_rand = 1;
2743                 if (wpa_s->mac_addr_pno) {
2744                         params.mac_addr = wpa_s->mac_addr_pno;
2745                         params.mac_addr_mask = wpa_s->mac_addr_pno + ETH_ALEN;
2746                 }
2747         }
2748
2749         wpa_scan_set_relative_rssi_params(wpa_s, &params);
2750
2751         ret = wpa_supplicant_start_sched_scan(wpa_s, &params);
2752         os_free(params.filter_ssids);
2753         if (ret == 0)
2754                 wpa_s->pno = 1;
2755         else
2756                 wpa_msg(wpa_s, MSG_ERROR, "Failed to schedule PNO");
2757         return ret;
2758 }
2759
2760
2761 int wpas_stop_pno(struct wpa_supplicant *wpa_s)
2762 {
2763         int ret = 0;
2764
2765         if (!wpa_s->pno)
2766                 return 0;
2767
2768         ret = wpa_supplicant_stop_sched_scan(wpa_s);
2769         wpa_s->sched_scan_stop_req = 1;
2770
2771         wpa_s->pno = 0;
2772         wpa_s->pno_sched_pending = 0;
2773
2774         if (wpa_s->wpa_state == WPA_SCANNING)
2775                 wpa_supplicant_req_scan(wpa_s, 0, 0);
2776
2777         return ret;
2778 }
2779
2780
2781 void wpas_mac_addr_rand_scan_clear(struct wpa_supplicant *wpa_s,
2782                                     unsigned int type)
2783 {
2784         type &= MAC_ADDR_RAND_ALL;
2785         wpa_s->mac_addr_rand_enable &= ~type;
2786
2787         if (type & MAC_ADDR_RAND_SCAN) {
2788                 os_free(wpa_s->mac_addr_scan);
2789                 wpa_s->mac_addr_scan = NULL;
2790         }
2791
2792         if (type & MAC_ADDR_RAND_SCHED_SCAN) {
2793                 os_free(wpa_s->mac_addr_sched_scan);
2794                 wpa_s->mac_addr_sched_scan = NULL;
2795         }
2796
2797         if (type & MAC_ADDR_RAND_PNO) {
2798                 os_free(wpa_s->mac_addr_pno);
2799                 wpa_s->mac_addr_pno = NULL;
2800         }
2801 }
2802
2803
2804 int wpas_mac_addr_rand_scan_set(struct wpa_supplicant *wpa_s,
2805                                 unsigned int type, const u8 *addr,
2806                                 const u8 *mask)
2807 {
2808         u8 *tmp = NULL;
2809
2810         if ((wpa_s->mac_addr_rand_supported & type) != type ) {
2811                 wpa_printf(MSG_INFO,
2812                            "scan: MAC randomization type %u != supported=%u",
2813                            type, wpa_s->mac_addr_rand_supported);
2814                 return -1;
2815         }
2816
2817         wpas_mac_addr_rand_scan_clear(wpa_s, type);
2818
2819         if (addr) {
2820                 tmp = os_malloc(2 * ETH_ALEN);
2821                 if (!tmp)
2822                         return -1;
2823                 os_memcpy(tmp, addr, ETH_ALEN);
2824                 os_memcpy(tmp + ETH_ALEN, mask, ETH_ALEN);
2825         }
2826
2827         if (type == MAC_ADDR_RAND_SCAN) {
2828                 wpa_s->mac_addr_scan = tmp;
2829         } else if (type == MAC_ADDR_RAND_SCHED_SCAN) {
2830                 wpa_s->mac_addr_sched_scan = tmp;
2831         } else if (type == MAC_ADDR_RAND_PNO) {
2832                 wpa_s->mac_addr_pno = tmp;
2833         } else {
2834                 wpa_printf(MSG_INFO,
2835                            "scan: Invalid MAC randomization type=0x%x",
2836                            type);
2837                 os_free(tmp);
2838                 return -1;
2839         }
2840
2841         wpa_s->mac_addr_rand_enable |= type;
2842         return 0;
2843 }
2844
2845
2846 int wpas_abort_ongoing_scan(struct wpa_supplicant *wpa_s)
2847 {
2848         struct wpa_radio_work *work;
2849         struct wpa_radio *radio = wpa_s->radio;
2850
2851         dl_list_for_each(work, &radio->work, struct wpa_radio_work, list) {
2852                 if (work->wpa_s != wpa_s || !work->started ||
2853                     (os_strcmp(work->type, "scan") != 0 &&
2854                      os_strcmp(work->type, "p2p-scan") != 0))
2855                         continue;
2856                 wpa_dbg(wpa_s, MSG_DEBUG, "Abort an ongoing scan");
2857                 return wpa_drv_abort_scan(wpa_s, wpa_s->curr_scan_cookie);
2858         }
2859
2860         wpa_dbg(wpa_s, MSG_DEBUG, "No ongoing scan/p2p-scan found to abort");
2861         return -1;
2862 }
2863
2864
2865 int wpas_sched_scan_plans_set(struct wpa_supplicant *wpa_s, const char *cmd)
2866 {
2867         struct sched_scan_plan *scan_plans = NULL;
2868         const char *token, *context = NULL;
2869         unsigned int num = 0;
2870
2871         if (!cmd)
2872                 return -1;
2873
2874         if (!cmd[0]) {
2875                 wpa_printf(MSG_DEBUG, "Clear sched scan plans");
2876                 os_free(wpa_s->sched_scan_plans);
2877                 wpa_s->sched_scan_plans = NULL;
2878                 wpa_s->sched_scan_plans_num = 0;
2879                 return 0;
2880         }
2881
2882         while ((token = cstr_token(cmd, " ", &context))) {
2883                 int ret;
2884                 struct sched_scan_plan *scan_plan, *n;
2885
2886                 n = os_realloc_array(scan_plans, num + 1, sizeof(*scan_plans));
2887                 if (!n)
2888                         goto fail;
2889
2890                 scan_plans = n;
2891                 scan_plan = &scan_plans[num];
2892                 num++;
2893
2894                 ret = sscanf(token, "%u:%u", &scan_plan->interval,
2895                              &scan_plan->iterations);
2896                 if (ret <= 0 || ret > 2 || !scan_plan->interval) {
2897                         wpa_printf(MSG_ERROR,
2898                                    "Invalid sched scan plan input: %s", token);
2899                         goto fail;
2900                 }
2901
2902                 if (scan_plan->interval > wpa_s->max_sched_scan_plan_interval) {
2903                         wpa_printf(MSG_WARNING,
2904                                    "scan plan %u: Scan interval too long(%u), use the maximum allowed(%u)",
2905                                    num, scan_plan->interval,
2906                                    wpa_s->max_sched_scan_plan_interval);
2907                         scan_plan->interval =
2908                                 wpa_s->max_sched_scan_plan_interval;
2909                 }
2910
2911                 if (ret == 1) {
2912                         scan_plan->iterations = 0;
2913                         break;
2914                 }
2915
2916                 if (!scan_plan->iterations) {
2917                         wpa_printf(MSG_ERROR,
2918                                    "scan plan %u: Number of iterations cannot be zero",
2919                                    num);
2920                         goto fail;
2921                 }
2922
2923                 if (scan_plan->iterations >
2924                     wpa_s->max_sched_scan_plan_iterations) {
2925                         wpa_printf(MSG_WARNING,
2926                                    "scan plan %u: Too many iterations(%u), use the maximum allowed(%u)",
2927                                    num, scan_plan->iterations,
2928                                    wpa_s->max_sched_scan_plan_iterations);
2929                         scan_plan->iterations =
2930                                 wpa_s->max_sched_scan_plan_iterations;
2931                 }
2932
2933                 wpa_printf(MSG_DEBUG,
2934                            "scan plan %u: interval=%u iterations=%u",
2935                            num, scan_plan->interval, scan_plan->iterations);
2936         }
2937
2938         if (!scan_plans) {
2939                 wpa_printf(MSG_ERROR, "Invalid scan plans entry");
2940                 goto fail;
2941         }
2942
2943         if (cstr_token(cmd, " ", &context) || scan_plans[num - 1].iterations) {
2944                 wpa_printf(MSG_ERROR,
2945                            "All scan plans but the last must specify a number of iterations");
2946                 goto fail;
2947         }
2948
2949         wpa_printf(MSG_DEBUG, "scan plan %u (last plan): interval=%u",
2950                    num, scan_plans[num - 1].interval);
2951
2952         if (num > wpa_s->max_sched_scan_plans) {
2953                 wpa_printf(MSG_WARNING,
2954                            "Too many scheduled scan plans (only %u supported)",
2955                            wpa_s->max_sched_scan_plans);
2956                 wpa_printf(MSG_WARNING,
2957                            "Use only the first %u scan plans, and the last one (in infinite loop)",
2958                            wpa_s->max_sched_scan_plans - 1);
2959                 os_memcpy(&scan_plans[wpa_s->max_sched_scan_plans - 1],
2960                           &scan_plans[num - 1], sizeof(*scan_plans));
2961                 num = wpa_s->max_sched_scan_plans;
2962         }
2963
2964         os_free(wpa_s->sched_scan_plans);
2965         wpa_s->sched_scan_plans = scan_plans;
2966         wpa_s->sched_scan_plans_num = num;
2967
2968         return 0;
2969
2970 fail:
2971         os_free(scan_plans);
2972         wpa_printf(MSG_ERROR, "invalid scan plans list");
2973         return -1;
2974 }
2975
2976
2977 /**
2978  * wpas_scan_reset_sched_scan - Reset sched_scan state
2979  * @wpa_s: Pointer to wpa_supplicant data
2980  *
2981  * This function is used to cancel a running scheduled scan and to reset an
2982  * internal scan state to continue with a regular scan on the following
2983  * wpa_supplicant_req_scan() calls.
2984  */
2985 void wpas_scan_reset_sched_scan(struct wpa_supplicant *wpa_s)
2986 {
2987         wpa_s->normal_scans = 0;
2988         if (wpa_s->sched_scanning) {
2989                 wpa_s->sched_scan_timed_out = 0;
2990                 wpa_s->prev_sched_ssid = NULL;
2991                 wpa_supplicant_cancel_sched_scan(wpa_s);
2992         }
2993 }
2994
2995
2996 void wpas_scan_restart_sched_scan(struct wpa_supplicant *wpa_s)
2997 {
2998         /* simulate timeout to restart the sched scan */
2999         wpa_s->sched_scan_timed_out = 1;
3000         wpa_s->prev_sched_ssid = NULL;
3001         wpa_supplicant_cancel_sched_scan(wpa_s);
3002 }