wpa_supplicant/scan.c

   1 /*
   2  * WPA Supplicant - Scanning
   3  * Copyright (c) 2003-2014, Jouni Malinen <j@w1.fi>
   4  *
   5  * This software may be distributed under the terms of the BSD license.
   6  * See README for more details.
   7  */
   8
   9 #include "utils/includes.h"
  10
  11 #include "utils/common.h"
  12 #include "utils/eloop.h"
  13 #include "common/ieee802_11_defs.h"
  14 #include "common/wpa_ctrl.h"
  15 #include "config.h"
  16 #include "wpa_supplicant_i.h"
  17 #include "driver_i.h"
  18 #include "wps_supplicant.h"
  19 #include "p2p_supplicant.h"
  20 #include "p2p/p2p.h"
  21 #include "hs20_supplicant.h"
  22 #include "notify.h"
  23 #include "bss.h"
  24 #include "scan.h"
  25 #include "mesh.h"
  26
  27
  28 static void wpa_supplicant_gen_assoc_event(struct wpa_supplicant *wpa_s)
  29 {
  30         struct wpa_ssid *ssid;
  31         union wpa_event_data data;
  32
  33         ssid = wpa_supplicant_get_ssid(wpa_s);
  34         if (ssid == NULL)
  35                 return;
  36
  37         if (wpa_s->current_ssid == NULL) {
  38                 wpa_s->current_ssid = ssid;
  39                 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         while (ssid) {
 121                 if (!wpas_network_disabled(wpa_s, ssid))
 122                         break;
 123                 ssid = ssid->next;
 124         }
 125
 126         /* ap_scan=2 mode - try to associate with each SSID. */
 127         if (ssid == NULL) {
 128                 wpa_dbg(wpa_s, MSG_DEBUG, "wpa_supplicant_assoc_try: Reached "
 129                         "end of scan list - go back to beginning");
 130                 wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
 131                 wpa_supplicant_req_scan(wpa_s, 0, 0);
 132                 return;
 133         }
 134         if (ssid->next) {
 135                 /* Continue from the next SSID on the next attempt. */
 136                 wpa_s->prev_scan_ssid = ssid;
 137         } else {
 138                 /* Start from the beginning of the SSID list. */
 139                 wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
 140         }
 141         wpa_supplicant_associate(wpa_s, NULL, ssid);
 142 }
 143
 144
 145 static void wpas_trigger_scan_cb(struct wpa_radio_work *work, int deinit)
 146 {
 147         struct wpa_supplicant *wpa_s = work->wpa_s;
 148         struct wpa_driver_scan_params *params = work->ctx;
 149         int ret;
 150
 151         if (deinit) {
 152                 if (!work->started) {
 153                         wpa_scan_free_params(params);
 154                         return;
 155                 }
 156                 wpa_supplicant_notify_scanning(wpa_s, 0);
 157                 wpas_notify_scan_done(wpa_s, 0);
 158                 wpa_s->scan_work = NULL;
 159                 return;
 160         }
 161
 162         if (wpas_update_random_addr_disassoc(wpa_s) < 0) {
 163                 wpa_msg(wpa_s, MSG_INFO,
 164                         "Failed to assign random MAC address for a scan");
 165                 wpa_scan_free_params(params);
 166                 wpa_msg(wpa_s, MSG_INFO, WPA_EVENT_SCAN_FAILED "ret=-1");
 167                 radio_work_done(work);
 168                 return;
 169         }
 170
 171         wpa_supplicant_notify_scanning(wpa_s, 1);
 172
 173         if (wpa_s->clear_driver_scan_cache) {
 174                 wpa_printf(MSG_DEBUG,
 175                            "Request driver to clear scan cache due to local BSS flush");
 176                 params->only_new_results = 1;
 177         }
 178         ret = wpa_drv_scan(wpa_s, params);
 179         wpa_scan_free_params(params);
 180         work->ctx = NULL;
 181         if (ret) {
 182                 int retry = wpa_s->last_scan_req != MANUAL_SCAN_REQ;
 183
 184                 if (wpa_s->disconnected)
 185                         retry = 0;
 186
 187                 wpa_supplicant_notify_scanning(wpa_s, 0);
 188                 wpas_notify_scan_done(wpa_s, 0);
 189                 if (wpa_s->wpa_state == WPA_SCANNING)
 190                         wpa_supplicant_set_state(wpa_s,
 191                                                  wpa_s->scan_prev_wpa_state);
 192                 wpa_msg(wpa_s, MSG_INFO, WPA_EVENT_SCAN_FAILED "ret=%d%s",
 193                         ret, retry ? " retry=1" : "");
 194                 radio_work_done(work);
 195
 196                 if (retry) {
 197                         /* Restore scan_req since we will try to scan again */
 198                         wpa_s->scan_req = wpa_s->last_scan_req;
 199                         wpa_supplicant_req_scan(wpa_s, 1, 0);
 200                 }
 201                 return;
 202         }
 203
 204         os_get_reltime(&wpa_s->scan_trigger_time);
 205         wpa_s->scan_runs++;
 206         wpa_s->normal_scans++;
 207         wpa_s->own_scan_requested = 1;
 208         wpa_s->clear_driver_scan_cache = 0;
 209         wpa_s->scan_work = work;
 210 }
 211
 212
 213 /**
 214  * wpa_supplicant_trigger_scan - Request driver to start a scan
 215  * @wpa_s: Pointer to wpa_supplicant data
 216  * @params: Scan parameters
 217  * Returns: 0 on success, -1 on failure
 218  */
 219 int wpa_supplicant_trigger_scan(struct wpa_supplicant *wpa_s,
 220                                 struct wpa_driver_scan_params *params)
 221 {
 222         struct wpa_driver_scan_params *ctx;
 223
 224         if (wpa_s->scan_work) {
 225                 wpa_dbg(wpa_s, MSG_INFO, "Reject scan trigger since one is already pending");
 226                 return -1;
 227         }
 228
 229         ctx = wpa_scan_clone_params(params);
 230         if (!ctx ||
 231             radio_add_work(wpa_s, 0, "scan", 0, wpas_trigger_scan_cb, ctx) < 0)
 232         {
 233                 wpa_scan_free_params(ctx);
 234                 wpa_msg(wpa_s, MSG_INFO, WPA_EVENT_SCAN_FAILED "ret=-1");
 235                 return -1;
 236         }
 237
 238         return 0;
 239 }
 240
 241
 242 static void
 243 wpa_supplicant_delayed_sched_scan_timeout(void *eloop_ctx, void *timeout_ctx)
 244 {
 245         struct wpa_supplicant *wpa_s = eloop_ctx;
 246
 247         wpa_dbg(wpa_s, MSG_DEBUG, "Starting delayed sched scan");
 248
 249         if (wpa_supplicant_req_sched_scan(wpa_s))
 250                 wpa_supplicant_req_scan(wpa_s, 0, 0);
 251 }
 252
 253
 254 static void
 255 wpa_supplicant_sched_scan_timeout(void *eloop_ctx, void *timeout_ctx)
 256 {
 257         struct wpa_supplicant *wpa_s = eloop_ctx;
 258
 259         wpa_dbg(wpa_s, MSG_DEBUG, "Sched scan timeout - stopping it");
 260
 261         wpa_s->sched_scan_timed_out = 1;
 262         wpa_supplicant_cancel_sched_scan(wpa_s);
 263 }
 264
 265
 266 static int
 267 wpa_supplicant_start_sched_scan(struct wpa_supplicant *wpa_s,
 268                                 struct wpa_driver_scan_params *params)
 269 {
 270         int ret;
 271
 272         wpa_supplicant_notify_scanning(wpa_s, 1);
 273         ret = wpa_drv_sched_scan(wpa_s, params);
 274         if (ret)
 275                 wpa_supplicant_notify_scanning(wpa_s, 0);
 276         else
 277                 wpa_s->sched_scanning = 1;
 278
 279         return ret;
 280 }
 281
 282
 283 static int wpa_supplicant_stop_sched_scan(struct wpa_supplicant *wpa_s)
 284 {
 285         int ret;
 286
 287         ret = wpa_drv_stop_sched_scan(wpa_s);
 288         if (ret) {
 289                 wpa_dbg(wpa_s, MSG_DEBUG, "stopping sched_scan failed!");
 290                 /* TODO: what to do if stopping fails? */
 291                 return -1;
 292         }
 293
 294         return ret;
 295 }
 296
 297
 298 static struct wpa_driver_scan_filter *
 299 wpa_supplicant_build_filter_ssids(struct wpa_config *conf, size_t *num_ssids)
 300 {
 301         struct wpa_driver_scan_filter *ssids;
 302         struct wpa_ssid *ssid;
 303         size_t count;
 304
 305         *num_ssids = 0;
 306         if (!conf->filter_ssids)
 307                 return NULL;
 308
 309         for (count = 0, ssid = conf->ssid; ssid; ssid = ssid->next) {
 310                 if (ssid->ssid && ssid->ssid_len)
 311                         count++;
 312         }
 313         if (count == 0)
 314                 return NULL;
 315         ssids = os_calloc(count, sizeof(struct wpa_driver_scan_filter));
 316         if (ssids == NULL)
 317                 return NULL;
 318
 319         for (ssid = conf->ssid; ssid; ssid = ssid->next) {
 320                 if (!ssid->ssid || !ssid->ssid_len)
 321                         continue;
 322                 os_memcpy(ssids[*num_ssids].ssid, ssid->ssid, ssid->ssid_len);
 323                 ssids[*num_ssids].ssid_len = ssid->ssid_len;
 324                 (*num_ssids)++;
 325         }
 326
 327         return ssids;
 328 }
 329
 330
 331 static void wpa_supplicant_optimize_freqs(
 332         struct wpa_supplicant *wpa_s, struct wpa_driver_scan_params *params)
 333 {
 334 #ifdef CONFIG_P2P
 335         if (params->freqs == NULL && wpa_s->p2p_in_provisioning &&
 336             wpa_s->go_params) {
 337                 /* Optimize provisioning state scan based on GO information */
 338                 if (wpa_s->p2p_in_provisioning < 5 &&
 339                     wpa_s->go_params->freq > 0) {
 340                         wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only GO "
 341                                 "preferred frequency %d MHz",
 342                                 wpa_s->go_params->freq);
 343                         params->freqs = os_calloc(2, sizeof(int));
 344                         if (params->freqs)
 345                                 params->freqs[0] = wpa_s->go_params->freq;
 346                 } else if (wpa_s->p2p_in_provisioning < 8 &&
 347                            wpa_s->go_params->freq_list[0]) {
 348                         wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only common "
 349                                 "channels");
 350                         int_array_concat(&params->freqs,
 351                                          wpa_s->go_params->freq_list);
 352                         if (params->freqs)
 353                                 int_array_sort_unique(params->freqs);
 354                 }
 355                 wpa_s->p2p_in_provisioning++;
 356         }
 357
 358         if (params->freqs == NULL && wpa_s->p2p_in_invitation) {
 359                 /*
 360                  * Optimize scan based on GO information during persistent
 361                  * group reinvocation
 362                  */
 363                 if (wpa_s->p2p_in_invitation < 5 &&
 364                     wpa_s->p2p_invite_go_freq > 0) {
 365                         wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only GO preferred frequency %d MHz during invitation",
 366                                 wpa_s->p2p_invite_go_freq);
 367                         params->freqs = os_calloc(2, sizeof(int));
 368                         if (params->freqs)
 369                                 params->freqs[0] = wpa_s->p2p_invite_go_freq;
 370                 }
 371                 wpa_s->p2p_in_invitation++;
 372                 if (wpa_s->p2p_in_invitation > 20) {
 373                         /*
 374                          * This should not really happen since the variable is
 375                          * cleared on group removal, but if it does happen, make
 376                          * sure we do not get stuck in special invitation scan
 377                          * mode.
 378                          */
 379                         wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Clear p2p_in_invitation");
 380                         wpa_s->p2p_in_invitation = 0;
 381                 }
 382         }
 383 #endif /* CONFIG_P2P */
 384
 385 #ifdef CONFIG_WPS
 386         if (params->freqs == NULL && wpa_s->after_wps && wpa_s->wps_freq) {
 387                 /*
 388                  * Optimize post-provisioning scan based on channel used
 389                  * during provisioning.
 390                  */
 391                 wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Scan only frequency %u MHz "
 392                         "that was used during provisioning", wpa_s->wps_freq);
 393                 params->freqs = os_calloc(2, sizeof(int));
 394                 if (params->freqs)
 395                         params->freqs[0] = wpa_s->wps_freq;
 396                 wpa_s->after_wps--;
 397         } else if (wpa_s->after_wps)
 398                 wpa_s->after_wps--;
 399
 400         if (params->freqs == NULL && wpa_s->known_wps_freq && wpa_s->wps_freq)
 401         {
 402                 /* Optimize provisioning scan based on already known channel */
 403                 wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Scan only frequency %u MHz",
 404                         wpa_s->wps_freq);
 405                 params->freqs = os_calloc(2, sizeof(int));
 406                 if (params->freqs)
 407                         params->freqs[0] = wpa_s->wps_freq;
 408                 wpa_s->known_wps_freq = 0; /* only do this once */
 409         }
 410 #endif /* CONFIG_WPS */
 411 }
 412
 413
 414 #ifdef CONFIG_INTERWORKING
 415 static void wpas_add_interworking_elements(struct wpa_supplicant *wpa_s,
 416                                            struct wpabuf *buf)
 417 {
 418         wpabuf_put_u8(buf, WLAN_EID_INTERWORKING);
 419         wpabuf_put_u8(buf, is_zero_ether_addr(wpa_s->conf->hessid) ? 1 :
 420                       1 + ETH_ALEN);
 421         wpabuf_put_u8(buf, wpa_s->conf->access_network_type);
 422         /* No Venue Info */
 423         if (!is_zero_ether_addr(wpa_s->conf->hessid))
 424                 wpabuf_put_data(buf, wpa_s->conf->hessid, ETH_ALEN);
 425 }
 426 #endif /* CONFIG_INTERWORKING */
 427
 428
 429 static struct wpabuf * wpa_supplicant_extra_ies(struct wpa_supplicant *wpa_s)
 430 {
 431         struct wpabuf *extra_ie = NULL;
 432         u8 ext_capab[18];
 433         int ext_capab_len;
 434 #ifdef CONFIG_WPS
 435         int wps = 0;
 436         enum wps_request_type req_type = WPS_REQ_ENROLLEE_INFO;
 437 #endif /* CONFIG_WPS */
 438
 439 #ifdef CONFIG_P2P
 440         if (wpa_s->p2p_group_interface == P2P_GROUP_INTERFACE_CLIENT)
 441                 wpa_drv_get_ext_capa(wpa_s, WPA_IF_P2P_CLIENT);
 442         else
 443 #endif /* CONFIG_P2P */
 444                 wpa_drv_get_ext_capa(wpa_s, WPA_IF_STATION);
 445
 446         ext_capab_len = wpas_build_ext_capab(wpa_s, ext_capab,
 447                                              sizeof(ext_capab));
 448         if (ext_capab_len > 0 &&
 449             wpabuf_resize(&extra_ie, ext_capab_len) == 0)
 450                 wpabuf_put_data(extra_ie, ext_capab, ext_capab_len);
 451
 452 #ifdef CONFIG_INTERWORKING
 453         if (wpa_s->conf->interworking &&
 454             wpabuf_resize(&extra_ie, 100) == 0)
 455                 wpas_add_interworking_elements(wpa_s, extra_ie);
 456 #endif /* CONFIG_INTERWORKING */
 457
 458 #ifdef CONFIG_WPS
 459         wps = wpas_wps_in_use(wpa_s, &req_type);
 460
 461         if (wps) {
 462                 struct wpabuf *wps_ie;
 463                 wps_ie = wps_build_probe_req_ie(wps == 2 ? DEV_PW_PUSHBUTTON :
 464                                                 DEV_PW_DEFAULT,
 465                                                 &wpa_s->wps->dev,
 466                                                 wpa_s->wps->uuid, req_type,
 467                                                 0, NULL);
 468                 if (wps_ie) {
 469                         if (wpabuf_resize(&extra_ie, wpabuf_len(wps_ie)) == 0)
 470                                 wpabuf_put_buf(extra_ie, wps_ie);
 471                         wpabuf_free(wps_ie);
 472                 }
 473         }
 474
 475 #ifdef CONFIG_P2P
 476         if (wps) {
 477                 size_t ielen = p2p_scan_ie_buf_len(wpa_s->global->p2p);
 478                 if (wpabuf_resize(&extra_ie, ielen) == 0)
 479                         wpas_p2p_scan_ie(wpa_s, extra_ie);
 480         }
 481 #endif /* CONFIG_P2P */
 482
 483         wpa_supplicant_mesh_add_scan_ie(wpa_s, &extra_ie);
 484
 485 #endif /* CONFIG_WPS */
 486
 487 #ifdef CONFIG_HS20
 488         if (wpa_s->conf->hs20 && wpabuf_resize(&extra_ie, 7) == 0)
 489                 wpas_hs20_add_indication(extra_ie, -1);
 490 #endif /* CONFIG_HS20 */
 491
 492 #ifdef CONFIG_FST
 493         if (wpa_s->fst_ies &&
 494             wpabuf_resize(&extra_ie, wpabuf_len(wpa_s->fst_ies)) == 0)
 495                 wpabuf_put_buf(extra_ie, wpa_s->fst_ies);
 496 #endif /* CONFIG_FST */
 497
 498 #ifdef CONFIG_MBO
 499         /* Send cellular capabilities for potential MBO STAs */
 500         if (wpabuf_resize(&extra_ie, 9) == 0)
 501                 wpas_mbo_scan_ie(wpa_s, extra_ie);
 502 #endif /* CONFIG_MBO */
 503
 504         if (wpa_s->vendor_elem[VENDOR_ELEM_PROBE_REQ]) {
 505                 struct wpabuf *buf = wpa_s->vendor_elem[VENDOR_ELEM_PROBE_REQ];
 506
 507                 if (wpabuf_resize(&extra_ie, wpabuf_len(buf)) == 0)
 508                         wpabuf_put_buf(extra_ie, buf);
 509         }
 510
 511         return extra_ie;
 512 }
 513
 514
 515 #ifdef CONFIG_P2P
 516
 517 /*
 518  * Check whether there are any enabled networks or credentials that could be
 519  * used for a non-P2P connection.
 520  */
 521 static int non_p2p_network_enabled(struct wpa_supplicant *wpa_s)
 522 {
 523         struct wpa_ssid *ssid;
 524
 525         for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
 526                 if (wpas_network_disabled(wpa_s, ssid))
 527                         continue;
 528                 if (!ssid->p2p_group)
 529                         return 1;
 530         }
 531
 532         if (wpa_s->conf->cred && wpa_s->conf->interworking &&
 533             wpa_s->conf->auto_interworking)
 534                 return 1;
 535
 536         return 0;
 537 }
 538
 539 #endif /* CONFIG_P2P */
 540
 541
 542 static void wpa_setband_scan_freqs_list(struct wpa_supplicant *wpa_s,
 543                                         enum hostapd_hw_mode band,
 544                                         struct wpa_driver_scan_params *params)
 545 {
 546         /* Include only supported channels for the specified band */
 547         struct hostapd_hw_modes *mode;
 548         int count, i;
 549
 550         mode = get_mode(wpa_s->hw.modes, wpa_s->hw.num_modes, band);
 551         if (mode == NULL) {
 552                 /* No channels supported in this band - use empty list */
 553                 params->freqs = os_zalloc(sizeof(int));
 554                 return;
 555         }
 556
 557         params->freqs = os_calloc(mode->num_channels + 1, sizeof(int));
 558         if (params->freqs == NULL)
 559                 return;
 560         for (count = 0, i = 0; i < mode->num_channels; i++) {
 561                 if (mode->channels[i].flag & HOSTAPD_CHAN_DISABLED)
 562                         continue;
 563                 params->freqs[count++] = mode->channels[i].freq;
 564         }
 565 }
 566
 567
 568 static void wpa_setband_scan_freqs(struct wpa_supplicant *wpa_s,
 569                                    struct wpa_driver_scan_params *params)
 570 {
 571         if (wpa_s->hw.modes == NULL)
 572                 return; /* unknown what channels the driver supports */
 573         if (params->freqs)
 574                 return; /* already using a limited channel set */
 575         if (wpa_s->setband == WPA_SETBAND_5G)
 576                 wpa_setband_scan_freqs_list(wpa_s, HOSTAPD_MODE_IEEE80211A,
 577                                             params);
 578         else if (wpa_s->setband == WPA_SETBAND_2G)
 579                 wpa_setband_scan_freqs_list(wpa_s, HOSTAPD_MODE_IEEE80211G,
 580                                             params);
 581 }
 582
 583
 584 static void wpa_set_scan_ssids(struct wpa_supplicant *wpa_s,
 585                                struct wpa_driver_scan_params *params,
 586                                size_t max_ssids)
 587 {
 588         unsigned int i;
 589         struct wpa_ssid *ssid;
 590
 591         /*
 592          * For devices with max_ssids greater than 1, leave the last slot empty
 593          * for adding the wildcard scan entry.
 594          */
 595         max_ssids = max_ssids > 1 ? max_ssids - 1 : max_ssids;
 596
 597         for (i = 0; i < wpa_s->scan_id_count; i++) {
 598                 unsigned int j;
 599
 600                 ssid = wpa_config_get_network(wpa_s->conf, wpa_s->scan_id[i]);
 601                 if (!ssid || !ssid->scan_ssid)
 602                         continue;
 603
 604                 for (j = 0; j < params->num_ssids; j++) {
 605                         if (params->ssids[j].ssid_len == ssid->ssid_len &&
 606                             params->ssids[j].ssid &&
 607                             os_memcmp(params->ssids[j].ssid, ssid->ssid,
 608                                       ssid->ssid_len) == 0)
 609                                 break;
 610                 }
 611                 if (j < params->num_ssids)
 612                         continue; /* already in the list */
 613
 614                 if (params->num_ssids + 1 > max_ssids) {
 615                         wpa_printf(MSG_DEBUG,
 616                                    "Over max scan SSIDs for manual request");
 617                         break;
 618                 }
 619
 620                 wpa_printf(MSG_DEBUG, "Scan SSID (manual request): %s",
 621                            wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
 622                 params->ssids[params->num_ssids].ssid = ssid->ssid;
 623                 params->ssids[params->num_ssids].ssid_len = ssid->ssid_len;
 624                 params->num_ssids++;
 625         }
 626
 627         wpa_s->scan_id_count = 0;
 628 }
 629
 630
 631 static int wpa_set_ssids_from_scan_req(struct wpa_supplicant *wpa_s,
 632                                        struct wpa_driver_scan_params *params,
 633                                        size_t max_ssids)
 634 {
 635         unsigned int i;
 636
 637         if (wpa_s->ssids_from_scan_req == NULL ||
 638             wpa_s->num_ssids_from_scan_req == 0)
 639                 return 0;
 640
 641         if (wpa_s->num_ssids_from_scan_req > max_ssids) {
 642                 wpa_s->num_ssids_from_scan_req = max_ssids;
 643                 wpa_printf(MSG_DEBUG, "Over max scan SSIDs from scan req: %u",
 644                            (unsigned int) max_ssids);
 645         }
 646
 647         for (i = 0; i < wpa_s->num_ssids_from_scan_req; i++) {
 648                 params->ssids[i].ssid = wpa_s->ssids_from_scan_req[i].ssid;
 649                 params->ssids[i].ssid_len =
 650                         wpa_s->ssids_from_scan_req[i].ssid_len;
 651                 wpa_hexdump_ascii(MSG_DEBUG, "specific SSID",
 652                                   params->ssids[i].ssid,
 653                                   params->ssids[i].ssid_len);
 654         }
 655
 656         params->num_ssids = wpa_s->num_ssids_from_scan_req;
 657         wpa_s->num_ssids_from_scan_req = 0;
 658         return 1;
 659 }
 660
 661
 662 static void wpa_supplicant_scan(void *eloop_ctx, void *timeout_ctx)
 663 {
 664         struct wpa_supplicant *wpa_s = eloop_ctx;
 665         struct wpa_ssid *ssid;
 666         int ret, p2p_in_prog;
 667         struct wpabuf *extra_ie = NULL;
 668         struct wpa_driver_scan_params params;
 669         struct wpa_driver_scan_params *scan_params;
 670         size_t max_ssids;
 671         int connect_without_scan = 0;
 672
 673         if (wpa_s->pno || wpa_s->pno_sched_pending) {
 674                 wpa_dbg(wpa_s, MSG_DEBUG, "Skip scan - PNO is in progress");
 675                 return;
 676         }
 677
 678         if (wpa_s->wpa_state == WPA_INTERFACE_DISABLED) {
 679                 wpa_dbg(wpa_s, MSG_DEBUG, "Skip scan - interface disabled");
 680                 return;
 681         }
 682
 683         if (wpa_s->disconnected && wpa_s->scan_req == NORMAL_SCAN_REQ) {
 684                 wpa_dbg(wpa_s, MSG_DEBUG, "Disconnected - do not scan");
 685                 wpa_supplicant_set_state(wpa_s, WPA_DISCONNECTED);
 686                 return;
 687         }
 688
 689         if (wpa_s->scanning) {
 690                 /*
 691                  * If we are already in scanning state, we shall reschedule the
 692                  * the incoming scan request.
 693                  */
 694                 wpa_dbg(wpa_s, MSG_DEBUG, "Already scanning - Reschedule the incoming scan req");
 695                 wpa_supplicant_req_scan(wpa_s, 1, 0);
 696                 return;
 697         }
 698
 699         if (!wpa_supplicant_enabled_networks(wpa_s) &&
 700             wpa_s->scan_req == NORMAL_SCAN_REQ) {
 701                 wpa_dbg(wpa_s, MSG_DEBUG, "No enabled networks - do not scan");
 702                 wpa_supplicant_set_state(wpa_s, WPA_INACTIVE);
 703                 return;
 704         }
 705
 706         if (wpa_s->conf->ap_scan != 0 &&
 707             (wpa_s->drv_flags & WPA_DRIVER_FLAGS_WIRED)) {
 708                 wpa_dbg(wpa_s, MSG_DEBUG, "Using wired authentication - "
 709                         "overriding ap_scan configuration");
 710                 wpa_s->conf->ap_scan = 0;
 711                 wpas_notify_ap_scan_changed(wpa_s);
 712         }
 713
 714         if (wpa_s->conf->ap_scan == 0) {
 715                 wpa_supplicant_gen_assoc_event(wpa_s);
 716                 return;
 717         }
 718
 719         ssid = NULL;
 720         if (wpa_s->scan_req != MANUAL_SCAN_REQ &&
 721             wpa_s->connect_without_scan) {
 722                 connect_without_scan = 1;
 723                 for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
 724                         if (ssid == wpa_s->connect_without_scan)
 725                                 break;
 726                 }
 727         }
 728
 729         p2p_in_prog = wpas_p2p_in_progress(wpa_s);
 730         if (p2p_in_prog && p2p_in_prog != 2 &&
 731             (!ssid ||
 732              (ssid->mode != WPAS_MODE_AP && ssid->mode != WPAS_MODE_P2P_GO))) {
 733                 wpa_dbg(wpa_s, MSG_DEBUG, "Delay station mode scan while P2P operation is in progress");
 734                 wpa_supplicant_req_scan(wpa_s, 5, 0);
 735                 return;
 736         }
 737
 738         if (wpa_s->conf->ap_scan == 2)
 739                 max_ssids = 1;
 740         else {
 741                 max_ssids = wpa_s->max_scan_ssids;
 742                 if (max_ssids > WPAS_MAX_SCAN_SSIDS)
 743                         max_ssids = WPAS_MAX_SCAN_SSIDS;
 744         }
 745
 746         wpa_s->last_scan_req = wpa_s->scan_req;
 747         wpa_s->scan_req = NORMAL_SCAN_REQ;
 748
 749         if (connect_without_scan) {
 750                 wpa_s->connect_without_scan = NULL;
 751                 if (ssid) {
 752                         wpa_printf(MSG_DEBUG, "Start a pre-selected network "
 753                                    "without scan step");
 754                         wpa_supplicant_associate(wpa_s, NULL, ssid);
 755                         return;
 756                 }
 757         }
 758
 759         os_memset(&params, 0, sizeof(params));
 760
 761         wpa_s->scan_prev_wpa_state = wpa_s->wpa_state;
 762         if (wpa_s->wpa_state == WPA_DISCONNECTED ||
 763             wpa_s->wpa_state == WPA_INACTIVE)
 764                 wpa_supplicant_set_state(wpa_s, WPA_SCANNING);
 765
 766         /*
 767          * If autoscan has set its own scanning parameters
 768          */
 769         if (wpa_s->autoscan_params != NULL) {
 770                 scan_params = wpa_s->autoscan_params;
 771                 goto scan;
 772         }
 773
 774         if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
 775             wpa_set_ssids_from_scan_req(wpa_s, &params, max_ssids)) {
 776                 wpa_printf(MSG_DEBUG, "Use specific SSIDs from SCAN command");
 777                 goto ssid_list_set;
 778         }
 779
 780 #ifdef CONFIG_P2P
 781         if ((wpa_s->p2p_in_provisioning || wpa_s->show_group_started) &&
 782             wpa_s->go_params && !wpa_s->conf->passive_scan) {
 783                 wpa_printf(MSG_DEBUG, "P2P: Use specific SSID for scan during P2P group formation (p2p_in_provisioning=%d show_group_started=%d)",
 784                            wpa_s->p2p_in_provisioning,
 785                            wpa_s->show_group_started);
 786                 params.ssids[0].ssid = wpa_s->go_params->ssid;
 787                 params.ssids[0].ssid_len = wpa_s->go_params->ssid_len;
 788                 params.num_ssids = 1;
 789                 goto ssid_list_set;
 790         }
 791
 792         if (wpa_s->p2p_in_invitation) {
 793                 if (wpa_s->current_ssid) {
 794                         wpa_printf(MSG_DEBUG, "P2P: Use specific SSID for scan during invitation");
 795                         params.ssids[0].ssid = wpa_s->current_ssid->ssid;
 796                         params.ssids[0].ssid_len =
 797                                 wpa_s->current_ssid->ssid_len;
 798                         params.num_ssids = 1;
 799                 } else {
 800                         wpa_printf(MSG_DEBUG, "P2P: No specific SSID known for scan during invitation");
 801                 }
 802                 goto ssid_list_set;
 803         }
 804 #endif /* CONFIG_P2P */
 805
 806         /* Find the starting point from which to continue scanning */
 807         ssid = wpa_s->conf->ssid;
 808         if (wpa_s->prev_scan_ssid != WILDCARD_SSID_SCAN) {
 809                 while (ssid) {
 810                         if (ssid == wpa_s->prev_scan_ssid) {
 811                                 ssid = ssid->next;
 812                                 break;
 813                         }
 814                         ssid = ssid->next;
 815                 }
 816         }
 817
 818         if (wpa_s->last_scan_req != MANUAL_SCAN_REQ &&
 819 #ifdef CONFIG_AP
 820             !wpa_s->ap_iface &&
 821 #endif /* CONFIG_AP */
 822             wpa_s->conf->ap_scan == 2) {
 823                 wpa_s->connect_without_scan = NULL;
 824                 wpa_s->prev_scan_wildcard = 0;
 825                 wpa_supplicant_assoc_try(wpa_s, ssid);
 826                 return;
 827         } else if (wpa_s->conf->ap_scan == 2) {
 828                 /*
 829                  * User-initiated scan request in ap_scan == 2; scan with
 830                  * wildcard SSID.
 831                  */
 832                 ssid = NULL;
 833         } else if (wpa_s->reattach && wpa_s->current_ssid != NULL) {
 834                 /*
 835                  * Perform single-channel single-SSID scan for
 836                  * reassociate-to-same-BSS operation.
 837                  */
 838                 /* Setup SSID */
 839                 ssid = wpa_s->current_ssid;
 840                 wpa_hexdump_ascii(MSG_DEBUG, "Scan SSID",
 841                                   ssid->ssid, ssid->ssid_len);
 842                 params.ssids[0].ssid = ssid->ssid;
 843                 params.ssids[0].ssid_len = ssid->ssid_len;
 844                 params.num_ssids = 1;
 845
 846                 /*
 847                  * Allocate memory for frequency array, allocate one extra
 848                  * slot for the zero-terminator.
 849                  */
 850                 params.freqs = os_malloc(sizeof(int) * 2);
 851                 if (params.freqs) {
 852                         params.freqs[0] = wpa_s->assoc_freq;
 853                         params.freqs[1] = 0;
 854                 }
 855
 856                 /*
 857                  * Reset the reattach flag so that we fall back to full scan if
 858                  * this scan fails.
 859                  */
 860                 wpa_s->reattach = 0;
 861         } else {
 862                 struct wpa_ssid *start = ssid, *tssid;
 863                 int freqs_set = 0;
 864                 if (ssid == NULL && max_ssids > 1)
 865                         ssid = wpa_s->conf->ssid;
 866                 while (ssid) {
 867                         if (!wpas_network_disabled(wpa_s, ssid) &&
 868                             ssid->scan_ssid) {
 869                                 wpa_hexdump_ascii(MSG_DEBUG, "Scan SSID",
 870                                                   ssid->ssid, ssid->ssid_len);
 871                                 params.ssids[params.num_ssids].ssid =
 872                                         ssid->ssid;
 873                                 params.ssids[params.num_ssids].ssid_len =
 874                                         ssid->ssid_len;
 875                                 params.num_ssids++;
 876                                 if (params.num_ssids + 1 >= max_ssids)
 877                                         break;
 878                         }
 879                         ssid = ssid->next;
 880                         if (ssid == start)
 881                                 break;
 882                         if (ssid == NULL && max_ssids > 1 &&
 883                             start != wpa_s->conf->ssid)
 884                                 ssid = wpa_s->conf->ssid;
 885                 }
 886
 887                 if (wpa_s->scan_id_count &&
 888                     wpa_s->last_scan_req == MANUAL_SCAN_REQ)
 889                         wpa_set_scan_ssids(wpa_s, &params, max_ssids);
 890
 891                 for (tssid = wpa_s->conf->ssid;
 892                      wpa_s->last_scan_req != MANUAL_SCAN_REQ && tssid;
 893                      tssid = tssid->next) {
 894                         if (wpas_network_disabled(wpa_s, tssid))
 895                                 continue;
 896                         if ((params.freqs || !freqs_set) && tssid->scan_freq) {
 897                                 int_array_concat(&params.freqs,
 898                                                  tssid->scan_freq);
 899                         } else {
 900                                 os_free(params.freqs);
 901                                 params.freqs = NULL;
 902                         }
 903                         freqs_set = 1;
 904                 }
 905                 int_array_sort_unique(params.freqs);
 906         }
 907
 908         if (ssid && max_ssids == 1) {
 909                 /*
 910                  * If the driver is limited to 1 SSID at a time interleave
 911                  * wildcard SSID scans with specific SSID scans to avoid
 912                  * waiting a long time for a wildcard scan.
 913                  */
 914                 if (!wpa_s->prev_scan_wildcard) {
 915                         params.ssids[0].ssid = NULL;
 916                         params.ssids[0].ssid_len = 0;
 917                         wpa_s->prev_scan_wildcard = 1;
 918                         wpa_dbg(wpa_s, MSG_DEBUG, "Starting AP scan for "
 919                                 "wildcard SSID (Interleave with specific)");
 920                 } else {
 921                         wpa_s->prev_scan_ssid = ssid;
 922                         wpa_s->prev_scan_wildcard = 0;
 923                         wpa_dbg(wpa_s, MSG_DEBUG,
 924                                 "Starting AP scan for specific SSID: %s",
 925                                 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
 926                 }
 927         } else if (ssid) {
 928                 /* max_ssids > 1 */
 929
 930                 wpa_s->prev_scan_ssid = ssid;
 931                 wpa_dbg(wpa_s, MSG_DEBUG, "Include wildcard SSID in "
 932                         "the scan request");
 933                 params.num_ssids++;
 934         } else if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
 935                    wpa_s->manual_scan_passive && params.num_ssids == 0) {
 936                 wpa_dbg(wpa_s, MSG_DEBUG, "Use passive scan based on manual request");
 937         } else if (wpa_s->conf->passive_scan) {
 938                 wpa_dbg(wpa_s, MSG_DEBUG,
 939                         "Use passive scan based on configuration");
 940         } else {
 941                 wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
 942                 params.num_ssids++;
 943                 wpa_dbg(wpa_s, MSG_DEBUG, "Starting AP scan for wildcard "
 944                         "SSID");
 945         }
 946
 947 ssid_list_set:
 948         wpa_supplicant_optimize_freqs(wpa_s, &params);
 949         extra_ie = wpa_supplicant_extra_ies(wpa_s);
 950
 951         if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
 952             wpa_s->manual_scan_only_new) {
 953                 wpa_printf(MSG_DEBUG,
 954                            "Request driver to clear scan cache due to manual only_new=1 scan");
 955                 params.only_new_results = 1;
 956         }
 957
 958         if (wpa_s->last_scan_req == MANUAL_SCAN_REQ && params.freqs == NULL &&
 959             wpa_s->manual_scan_freqs) {
 960                 wpa_dbg(wpa_s, MSG_DEBUG, "Limit manual scan to specified channels");
 961                 params.freqs = wpa_s->manual_scan_freqs;
 962                 wpa_s->manual_scan_freqs = NULL;
 963         }
 964
 965         if (params.freqs == NULL && wpa_s->next_scan_freqs) {
 966                 wpa_dbg(wpa_s, MSG_DEBUG, "Optimize scan based on previously "
 967                         "generated frequency list");
 968                 params.freqs = wpa_s->next_scan_freqs;
 969         } else
 970                 os_free(wpa_s->next_scan_freqs);
 971         wpa_s->next_scan_freqs = NULL;
 972         wpa_setband_scan_freqs(wpa_s, &params);
 973
 974         /* See if user specified frequencies. If so, scan only those. */
 975         if (wpa_s->conf->freq_list && !params.freqs) {
 976                 wpa_dbg(wpa_s, MSG_DEBUG,
 977                         "Optimize scan based on conf->freq_list");
 978                 int_array_concat(&params.freqs, wpa_s->conf->freq_list);
 979         }
 980
 981         /* Use current associated channel? */
 982         if (wpa_s->conf->scan_cur_freq && !params.freqs) {
 983                 unsigned int num = wpa_s->num_multichan_concurrent;
 984
 985                 params.freqs = os_calloc(num + 1, sizeof(int));
 986                 if (params.freqs) {
 987                         num = get_shared_radio_freqs(wpa_s, params.freqs, num);
 988                         if (num > 0) {
 989                                 wpa_dbg(wpa_s, MSG_DEBUG, "Scan only the "
 990                                         "current operating channels since "
 991                                         "scan_cur_freq is enabled");
 992                         } else {
 993                                 os_free(params.freqs);
 994                                 params.freqs = NULL;
 995                         }
 996                 }
 997         }
 998
 999         params.filter_ssids = wpa_supplicant_build_filter_ssids(
1000                 wpa_s->conf, &params.num_filter_ssids);
1001         if (extra_ie) {
1002                 params.extra_ies = wpabuf_head(extra_ie);
1003                 params.extra_ies_len = wpabuf_len(extra_ie);
1004         }
1005
1006 #ifdef CONFIG_P2P
1007         if (wpa_s->p2p_in_provisioning || wpa_s->p2p_in_invitation ||
1008             (wpa_s->show_group_started && wpa_s->go_params)) {
1009                 /*
1010                  * The interface may not yet be in P2P mode, so we have to
1011                  * explicitly request P2P probe to disable CCK rates.
1012                  */
1013                 params.p2p_probe = 1;
1014         }
1015 #endif /* CONFIG_P2P */
1016
1017         if (wpa_s->mac_addr_rand_enable & MAC_ADDR_RAND_SCAN) {
1018                 params.mac_addr_rand = 1;
1019                 if (wpa_s->mac_addr_scan) {
1020                         params.mac_addr = wpa_s->mac_addr_scan;
1021                         params.mac_addr_mask = wpa_s->mac_addr_scan + ETH_ALEN;
1022                 }
1023         }
1024
1025         if (!is_zero_ether_addr(wpa_s->next_scan_bssid)) {
1026                 struct wpa_bss *bss;
1027
1028                 params.bssid = wpa_s->next_scan_bssid;
1029                 bss = wpa_bss_get_bssid_latest(wpa_s, params.bssid);
1030                 if (bss && bss->ssid_len && params.num_ssids == 1 &&
1031                     params.ssids[0].ssid_len == 0) {
1032                         params.ssids[0].ssid = bss->ssid;
1033                         params.ssids[0].ssid_len = bss->ssid_len;
1034                         wpa_dbg(wpa_s, MSG_DEBUG,
1035                                 "Scan a previously specified BSSID " MACSTR
1036                                 " and SSID %s",
1037                                 MAC2STR(params.bssid),
1038                                 wpa_ssid_txt(bss->ssid, bss->ssid_len));
1039                 } else {
1040                         wpa_dbg(wpa_s, MSG_DEBUG,
1041                                 "Scan a previously specified BSSID " MACSTR,
1042                                 MAC2STR(params.bssid));
1043                 }
1044         }
1045
1046         scan_params = &params;
1047
1048 scan:
1049 #ifdef CONFIG_P2P
1050         /*
1051          * If the driver does not support multi-channel concurrency and a
1052          * virtual interface that shares the same radio with the wpa_s interface
1053          * is operating there may not be need to scan other channels apart from
1054          * the current operating channel on the other virtual interface. Filter
1055          * out other channels in case we are trying to find a connection for a
1056          * station interface when we are not configured to prefer station
1057          * connection and a concurrent operation is already in process.
1058          */
1059         if (wpa_s->scan_for_connection &&
1060             wpa_s->last_scan_req == NORMAL_SCAN_REQ &&
1061             !scan_params->freqs && !params.freqs &&
1062             wpas_is_p2p_prioritized(wpa_s) &&
1063             wpa_s->p2p_group_interface == NOT_P2P_GROUP_INTERFACE &&
1064             non_p2p_network_enabled(wpa_s)) {
1065                 unsigned int num = wpa_s->num_multichan_concurrent;
1066
1067                 params.freqs = os_calloc(num + 1, sizeof(int));
1068                 if (params.freqs) {
1069                         num = get_shared_radio_freqs(wpa_s, params.freqs, num);
1070                         if (num > 0 && num == wpa_s->num_multichan_concurrent) {
1071                                 wpa_dbg(wpa_s, MSG_DEBUG, "Scan only the current operating channels since all channels are already used");
1072                         } else {
1073                                 os_free(params.freqs);
1074                                 params.freqs = NULL;
1075                         }
1076                 }
1077         }
1078 #endif /* CONFIG_P2P */
1079
1080         ret = wpa_supplicant_trigger_scan(wpa_s, scan_params);
1081
1082         if (ret && wpa_s->last_scan_req == MANUAL_SCAN_REQ && params.freqs &&
1083             !wpa_s->manual_scan_freqs) {
1084                 /* Restore manual_scan_freqs for the next attempt */
1085                 wpa_s->manual_scan_freqs = params.freqs;
1086                 params.freqs = NULL;
1087         }
1088
1089         wpabuf_free(extra_ie);
1090         os_free(params.freqs);
1091         os_free(params.filter_ssids);
1092
1093         if (ret) {
1094                 wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate AP scan");
1095                 if (wpa_s->scan_prev_wpa_state != wpa_s->wpa_state)
1096                         wpa_supplicant_set_state(wpa_s,
1097                                                  wpa_s->scan_prev_wpa_state);
1098                 /* Restore scan_req since we will try to scan again */
1099                 wpa_s->scan_req = wpa_s->last_scan_req;
1100                 wpa_supplicant_req_scan(wpa_s, 1, 0);
1101         } else {
1102                 wpa_s->scan_for_connection = 0;
1103 #ifdef CONFIG_INTERWORKING
1104                 wpa_s->interworking_fast_assoc_tried = 0;
1105 #endif /* CONFIG_INTERWORKING */
1106                 if (params.bssid)
1107                         os_memset(wpa_s->next_scan_bssid, 0, ETH_ALEN);
1108         }
1109 }
1110
1111
1112 void wpa_supplicant_update_scan_int(struct wpa_supplicant *wpa_s, int sec)
1113 {
1114         struct os_reltime remaining, new_int;
1115         int cancelled;
1116
1117         cancelled = eloop_cancel_timeout_one(wpa_supplicant_scan, wpa_s, NULL,
1118                                              &remaining);
1119
1120         new_int.sec = sec;
1121         new_int.usec = 0;
1122         if (cancelled && os_reltime_before(&remaining, &new_int)) {
1123                 new_int.sec = remaining.sec;
1124                 new_int.usec = remaining.usec;
1125         }
1126
1127         if (cancelled) {
1128                 eloop_register_timeout(new_int.sec, new_int.usec,
1129                                        wpa_supplicant_scan, wpa_s, NULL);
1130         }
1131         wpa_s->scan_interval = sec;
1132 }
1133
1134
1135 /**
1136  * wpa_supplicant_req_scan - Schedule a scan for neighboring access points
1137  * @wpa_s: Pointer to wpa_supplicant data
1138  * @sec: Number of seconds after which to scan
1139  * @usec: Number of microseconds after which to scan
1140  *
1141  * This function is used to schedule a scan for neighboring access points after
1142  * the specified time.
1143  */
1144 void wpa_supplicant_req_scan(struct wpa_supplicant *wpa_s, int sec, int usec)
1145 {
1146         int res;
1147
1148         if (wpa_s->p2p_mgmt) {
1149                 wpa_dbg(wpa_s, MSG_DEBUG,
1150                         "Ignore scan request (%d.%06d sec) on p2p_mgmt interface",
1151                         sec, usec);
1152                 return;
1153         }
1154
1155         res = eloop_deplete_timeout(sec, usec, wpa_supplicant_scan, wpa_s,
1156                                     NULL);
1157         if (res == 1) {
1158                 wpa_dbg(wpa_s, MSG_DEBUG, "Rescheduling scan request: %d.%06d sec",
1159                         sec, usec);
1160         } else if (res == 0) {
1161                 wpa_dbg(wpa_s, MSG_DEBUG, "Ignore new scan request for %d.%06d sec since an earlier request is scheduled to trigger sooner",
1162                         sec, usec);
1163         } else {
1164                 wpa_dbg(wpa_s, MSG_DEBUG, "Setting scan request: %d.%06d sec",
1165                         sec, usec);
1166                 eloop_register_timeout(sec, usec, wpa_supplicant_scan, wpa_s, NULL);
1167         }
1168 }
1169
1170
1171 /**
1172  * wpa_supplicant_delayed_sched_scan - Request a delayed scheduled scan
1173  * @wpa_s: Pointer to wpa_supplicant data
1174  * @sec: Number of seconds after which to scan
1175  * @usec: Number of microseconds after which to scan
1176  * Returns: 0 on success or -1 otherwise
1177  *
1178  * This function is used to schedule periodic scans for neighboring
1179  * access points after the specified time.
1180  */
1181 int wpa_supplicant_delayed_sched_scan(struct wpa_supplicant *wpa_s,
1182                                       int sec, int usec)
1183 {
1184         if (!wpa_s->sched_scan_supported)
1185                 return -1;
1186
1187         eloop_register_timeout(sec, usec,
1188                                wpa_supplicant_delayed_sched_scan_timeout,
1189                                wpa_s, NULL);
1190
1191         return 0;
1192 }
1193
1194
1195 /**
1196  * wpa_supplicant_req_sched_scan - Start a periodic scheduled scan
1197  * @wpa_s: Pointer to wpa_supplicant data
1198  * Returns: 0 is sched_scan was started or -1 otherwise
1199  *
1200  * This function is used to schedule periodic scans for neighboring
1201  * access points repeating the scan continuously.
1202  */
1203 int wpa_supplicant_req_sched_scan(struct wpa_supplicant *wpa_s)
1204 {
1205         struct wpa_driver_scan_params params;
1206         struct wpa_driver_scan_params *scan_params;
1207         enum wpa_states prev_state;
1208         struct wpa_ssid *ssid = NULL;
1209         struct wpabuf *extra_ie = NULL;
1210         int ret;
1211         unsigned int max_sched_scan_ssids;
1212         int wildcard = 0;
1213         int need_ssids;
1214         struct sched_scan_plan scan_plan;
1215
1216         if (!wpa_s->sched_scan_supported)
1217                 return -1;
1218
1219         if (wpa_s->max_sched_scan_ssids > WPAS_MAX_SCAN_SSIDS)
1220                 max_sched_scan_ssids = WPAS_MAX_SCAN_SSIDS;
1221         else
1222                 max_sched_scan_ssids = wpa_s->max_sched_scan_ssids;
1223         if (max_sched_scan_ssids < 1 || wpa_s->conf->disable_scan_offload)
1224                 return -1;
1225
1226         if (wpa_s->sched_scanning) {
1227                 wpa_dbg(wpa_s, MSG_DEBUG, "Already sched scanning");
1228                 return 0;
1229         }
1230
1231         need_ssids = 0;
1232         for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
1233                 if (!wpas_network_disabled(wpa_s, ssid) && !ssid->scan_ssid) {
1234                         /* Use wildcard SSID to find this network */
1235                         wildcard = 1;
1236                 } else if (!wpas_network_disabled(wpa_s, ssid) &&
1237                            ssid->ssid_len)
1238                         need_ssids++;
1239
1240 #ifdef CONFIG_WPS
1241                 if (!wpas_network_disabled(wpa_s, ssid) &&
1242                     ssid->key_mgmt == WPA_KEY_MGMT_WPS) {
1243                         /*
1244                          * Normal scan is more reliable and faster for WPS
1245                          * operations and since these are for short periods of
1246                          * time, the benefit of trying to use sched_scan would
1247                          * be limited.
1248                          */
1249                         wpa_dbg(wpa_s, MSG_DEBUG, "Use normal scan instead of "
1250                                 "sched_scan for WPS");
1251                         return -1;
1252                 }
1253 #endif /* CONFIG_WPS */
1254         }
1255         if (wildcard)
1256                 need_ssids++;
1257
1258         if (wpa_s->normal_scans < 3 &&
1259             (need_ssids <= wpa_s->max_scan_ssids ||
1260              wpa_s->max_scan_ssids >= (int) max_sched_scan_ssids)) {
1261                 /*
1262                  * When normal scan can speed up operations, use that for the
1263                  * first operations before starting the sched_scan to allow
1264                  * user space sleep more. We do this only if the normal scan
1265                  * has functionality that is suitable for this or if the
1266                  * sched_scan does not have better support for multiple SSIDs.
1267                  */
1268                 wpa_dbg(wpa_s, MSG_DEBUG, "Use normal scan instead of "
1269                         "sched_scan for initial scans (normal_scans=%d)",
1270                         wpa_s->normal_scans);
1271                 return -1;
1272         }
1273
1274         os_memset(&params, 0, sizeof(params));
1275
1276         /* If we can't allocate space for the filters, we just don't filter */
1277         params.filter_ssids = os_calloc(wpa_s->max_match_sets,
1278                                         sizeof(struct wpa_driver_scan_filter));
1279
1280         prev_state = wpa_s->wpa_state;
1281         if (wpa_s->wpa_state == WPA_DISCONNECTED ||
1282             wpa_s->wpa_state == WPA_INACTIVE)
1283                 wpa_supplicant_set_state(wpa_s, WPA_SCANNING);
1284
1285         if (wpa_s->autoscan_params != NULL) {
1286                 scan_params = wpa_s->autoscan_params;
1287                 goto scan;
1288         }
1289
1290         /* Find the starting point from which to continue scanning */
1291         ssid = wpa_s->conf->ssid;
1292         if (wpa_s->prev_sched_ssid) {
1293                 while (ssid) {
1294                         if (ssid == wpa_s->prev_sched_ssid) {
1295                                 ssid = ssid->next;
1296                                 break;
1297                         }
1298                         ssid = ssid->next;
1299                 }
1300         }
1301
1302         if (!ssid || !wpa_s->prev_sched_ssid) {
1303                 wpa_dbg(wpa_s, MSG_DEBUG, "Beginning of SSID list");
1304                 wpa_s->sched_scan_timeout = max_sched_scan_ssids * 2;
1305                 wpa_s->first_sched_scan = 1;
1306                 ssid = wpa_s->conf->ssid;
1307                 wpa_s->prev_sched_ssid = ssid;
1308         }
1309
1310         if (wildcard) {
1311                 wpa_dbg(wpa_s, MSG_DEBUG, "Add wildcard SSID to sched_scan");
1312                 params.num_ssids++;
1313         }
1314
1315         while (ssid) {
1316                 if (wpas_network_disabled(wpa_s, ssid))
1317                         goto next;
1318
1319                 if (params.num_filter_ssids < wpa_s->max_match_sets &&
1320                     params.filter_ssids && ssid->ssid && ssid->ssid_len) {
1321                         wpa_dbg(wpa_s, MSG_DEBUG, "add to filter ssid: %s",
1322                                 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
1323                         os_memcpy(params.filter_ssids[params.num_filter_ssids].ssid,
1324                                   ssid->ssid, ssid->ssid_len);
1325                         params.filter_ssids[params.num_filter_ssids].ssid_len =
1326                                 ssid->ssid_len;
1327                         params.num_filter_ssids++;
1328                 } else if (params.filter_ssids && ssid->ssid && ssid->ssid_len)
1329                 {
1330                         wpa_dbg(wpa_s, MSG_DEBUG, "Not enough room for SSID "
1331                                 "filter for sched_scan - drop filter");
1332                         os_free(params.filter_ssids);
1333                         params.filter_ssids = NULL;
1334                         params.num_filter_ssids = 0;
1335                 }
1336
1337                 if (ssid->scan_ssid && ssid->ssid && ssid->ssid_len) {
1338                         if (params.num_ssids == max_sched_scan_ssids)
1339                                 break; /* only room for broadcast SSID */
1340                         wpa_dbg(wpa_s, MSG_DEBUG,
1341                                 "add to active scan ssid: %s",
1342                                 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
1343                         params.ssids[params.num_ssids].ssid =
1344                                 ssid->ssid;
1345                         params.ssids[params.num_ssids].ssid_len =
1346                                 ssid->ssid_len;
1347                         params.num_ssids++;
1348                         if (params.num_ssids >= max_sched_scan_ssids) {
1349                                 wpa_s->prev_sched_ssid = ssid;
1350                                 do {
1351                                         ssid = ssid->next;
1352                                 } while (ssid &&
1353                                          (wpas_network_disabled(wpa_s, ssid) ||
1354                                           !ssid->scan_ssid));
1355                                 break;
1356                         }
1357                 }
1358
1359         next:
1360                 wpa_s->prev_sched_ssid = ssid;
1361                 ssid = ssid->next;
1362         }
1363
1364         if (params.num_filter_ssids == 0) {
1365                 os_free(params.filter_ssids);
1366                 params.filter_ssids = NULL;
1367         }
1368
1369         extra_ie = wpa_supplicant_extra_ies(wpa_s);
1370         if (extra_ie) {
1371                 params.extra_ies = wpabuf_head(extra_ie);
1372                 params.extra_ies_len = wpabuf_len(extra_ie);
1373         }
1374
1375         if (wpa_s->conf->filter_rssi)
1376                 params.filter_rssi = wpa_s->conf->filter_rssi;
1377
1378         /* See if user specified frequencies. If so, scan only those. */
1379         if (wpa_s->conf->freq_list && !params.freqs) {
1380                 wpa_dbg(wpa_s, MSG_DEBUG,
1381                         "Optimize scan based on conf->freq_list");
1382                 int_array_concat(&params.freqs, wpa_s->conf->freq_list);
1383         }
1384
1385         scan_params = &params;
1386
1387 scan:
1388         wpa_s->sched_scan_timed_out = 0;
1389
1390         /*
1391          * We cannot support multiple scan plans if the scan request includes
1392          * too many SSID's, so in this case use only the last scan plan and make
1393          * it run infinitely. It will be stopped by the timeout.
1394          */
1395         if (wpa_s->sched_scan_plans_num == 1 ||
1396             (wpa_s->sched_scan_plans_num && !ssid && wpa_s->first_sched_scan)) {
1397                 params.sched_scan_plans = wpa_s->sched_scan_plans;
1398                 params.sched_scan_plans_num = wpa_s->sched_scan_plans_num;
1399         } else if (wpa_s->sched_scan_plans_num > 1) {
1400                 wpa_dbg(wpa_s, MSG_DEBUG,
1401                         "Too many SSIDs. Default to using single scheduled_scan plan");
1402                 params.sched_scan_plans =
1403                         &wpa_s->sched_scan_plans[wpa_s->sched_scan_plans_num -
1404                                                  1];
1405                 params.sched_scan_plans_num = 1;
1406         } else {
1407                 if (wpa_s->conf->sched_scan_interval)
1408                         scan_plan.interval = wpa_s->conf->sched_scan_interval;
1409                 else
1410                         scan_plan.interval = 10;
1411
1412                 if (scan_plan.interval > wpa_s->max_sched_scan_plan_interval) {
1413                         wpa_printf(MSG_WARNING,
1414                                    "Scan interval too long(%u), use the maximum allowed(%u)",
1415                                    scan_plan.interval,
1416                                    wpa_s->max_sched_scan_plan_interval);
1417                         scan_plan.interval =
1418                                 wpa_s->max_sched_scan_plan_interval;
1419                 }
1420
1421                 scan_plan.iterations = 0;
1422                 params.sched_scan_plans = &scan_plan;
1423                 params.sched_scan_plans_num = 1;
1424         }
1425
1426         if (ssid || !wpa_s->first_sched_scan) {
1427                 wpa_dbg(wpa_s, MSG_DEBUG,
1428                         "Starting sched scan: interval %u timeout %d",
1429                         params.sched_scan_plans[0].interval,
1430                         wpa_s->sched_scan_timeout);
1431         } else {
1432                 wpa_dbg(wpa_s, MSG_DEBUG, "Starting sched scan (no timeout)");
1433         }
1434
1435         wpa_setband_scan_freqs(wpa_s, scan_params);
1436
1437         if (wpa_s->mac_addr_rand_enable & MAC_ADDR_RAND_SCHED_SCAN) {
1438                 params.mac_addr_rand = 1;
1439                 if (wpa_s->mac_addr_sched_scan) {
1440                         params.mac_addr = wpa_s->mac_addr_sched_scan;
1441                         params.mac_addr_mask = wpa_s->mac_addr_sched_scan +
1442                                 ETH_ALEN;
1443                 }
1444         }
1445
1446         ret = wpa_supplicant_start_sched_scan(wpa_s, scan_params);
1447         wpabuf_free(extra_ie);
1448         os_free(params.filter_ssids);
1449         if (ret) {
1450                 wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate sched scan");
1451                 if (prev_state != wpa_s->wpa_state)
1452                         wpa_supplicant_set_state(wpa_s, prev_state);
1453                 return ret;
1454         }
1455
1456         /* If we have more SSIDs to scan, add a timeout so we scan them too */
1457         if (ssid || !wpa_s->first_sched_scan) {
1458                 wpa_s->sched_scan_timed_out = 0;
1459                 eloop_register_timeout(wpa_s->sched_scan_timeout, 0,
1460                                        wpa_supplicant_sched_scan_timeout,
1461                                        wpa_s, NULL);
1462                 wpa_s->first_sched_scan = 0;
1463                 wpa_s->sched_scan_timeout /= 2;
1464                 params.sched_scan_plans[0].interval *= 2;
1465                 if ((unsigned int) wpa_s->sched_scan_timeout <
1466                     params.sched_scan_plans[0].interval ||
1467                     params.sched_scan_plans[0].interval >
1468                     wpa_s->max_sched_scan_plan_interval) {
1469                         params.sched_scan_plans[0].interval = 10;
1470                         wpa_s->sched_scan_timeout = max_sched_scan_ssids * 2;
1471                 }
1472         }
1473
1474         /* If there is no more ssids, start next time from the beginning */
1475         if (!ssid)
1476                 wpa_s->prev_sched_ssid = NULL;
1477
1478         return 0;
1479 }
1480
1481
1482 /**
1483  * wpa_supplicant_cancel_scan - Cancel a scheduled scan request
1484  * @wpa_s: Pointer to wpa_supplicant data
1485  *
1486  * This function is used to cancel a scan request scheduled with
1487  * wpa_supplicant_req_scan().
1488  */
1489 void wpa_supplicant_cancel_scan(struct wpa_supplicant *wpa_s)
1490 {
1491         wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling scan request");
1492         eloop_cancel_timeout(wpa_supplicant_scan, wpa_s, NULL);
1493 }
1494
1495
1496 /**
1497  * wpa_supplicant_cancel_delayed_sched_scan - Stop a delayed scheduled scan
1498  * @wpa_s: Pointer to wpa_supplicant data
1499  *
1500  * This function is used to stop a delayed scheduled scan.
1501  */
1502 void wpa_supplicant_cancel_delayed_sched_scan(struct wpa_supplicant *wpa_s)
1503 {
1504         if (!wpa_s->sched_scan_supported)
1505                 return;
1506
1507         wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling delayed sched scan");
1508         eloop_cancel_timeout(wpa_supplicant_delayed_sched_scan_timeout,
1509                              wpa_s, NULL);
1510 }
1511
1512
1513 /**
1514  * wpa_supplicant_cancel_sched_scan - Stop running scheduled scans
1515  * @wpa_s: Pointer to wpa_supplicant data
1516  *
1517  * This function is used to stop a periodic scheduled scan.
1518  */
1519 void wpa_supplicant_cancel_sched_scan(struct wpa_supplicant *wpa_s)
1520 {
1521         if (!wpa_s->sched_scanning)
1522                 return;
1523
1524         wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling sched scan");
1525         eloop_cancel_timeout(wpa_supplicant_sched_scan_timeout, wpa_s, NULL);
1526         wpa_supplicant_stop_sched_scan(wpa_s);
1527 }
1528
1529
1530 /**
1531  * wpa_supplicant_notify_scanning - Indicate possible scan state change
1532  * @wpa_s: Pointer to wpa_supplicant data
1533  * @scanning: Whether scanning is currently in progress
1534  *
1535  * This function is to generate scanning notifycations. It is called whenever
1536  * there may have been a change in scanning (scan started, completed, stopped).
1537  * wpas_notify_scanning() is called whenever the scanning state changed from the
1538  * previously notified state.
1539  */
1540 void wpa_supplicant_notify_scanning(struct wpa_supplicant *wpa_s,
1541                                     int scanning)
1542 {
1543         if (wpa_s->scanning != scanning) {
1544                 wpa_s->scanning = scanning;
1545                 wpas_notify_scanning(wpa_s);
1546         }
1547 }
1548
1549
1550 static int wpa_scan_get_max_rate(const struct wpa_scan_res *res)
1551 {
1552         int rate = 0;
1553         const u8 *ie;
1554         int i;
1555
1556         ie = wpa_scan_get_ie(res, WLAN_EID_SUPP_RATES);
1557         for (i = 0; ie && i < ie[1]; i++) {
1558                 if ((ie[i + 2] & 0x7f) > rate)
1559                         rate = ie[i + 2] & 0x7f;
1560         }
1561
1562         ie = wpa_scan_get_ie(res, WLAN_EID_EXT_SUPP_RATES);
1563         for (i = 0; ie && i < ie[1]; i++) {
1564                 if ((ie[i + 2] & 0x7f) > rate)
1565                         rate = ie[i + 2] & 0x7f;
1566         }
1567
1568         return rate;
1569 }
1570
1571
1572 /**
1573  * wpa_scan_get_ie - Fetch a specified information element from a scan result
1574  * @res: Scan result entry
1575  * @ie: Information element identitifier (WLAN_EID_*)
1576  * Returns: Pointer to the information element (id field) or %NULL if not found
1577  *
1578  * This function returns the first matching information element in the scan
1579  * result.
1580  */
1581 const u8 * wpa_scan_get_ie(const struct wpa_scan_res *res, u8 ie)
1582 {
1583         return get_ie((const u8 *) (res + 1), res->ie_len, ie);
1584 }
1585
1586
1587 /**
1588  * wpa_scan_get_vendor_ie - Fetch vendor information element from a scan result
1589  * @res: Scan result entry
1590  * @vendor_type: Vendor type (four octets starting the IE payload)
1591  * Returns: Pointer to the information element (id field) or %NULL if not found
1592  *
1593  * This function returns the first matching information element in the scan
1594  * result.
1595  */
1596 const u8 * wpa_scan_get_vendor_ie(const struct wpa_scan_res *res,
1597                                   u32 vendor_type)
1598 {
1599         const u8 *end, *pos;
1600
1601         pos = (const u8 *) (res + 1);
1602         end = pos + res->ie_len;
1603
1604         while (end - pos > 1) {
1605                 if (2 + pos[1] > end - pos)
1606                         break;
1607                 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1608                     vendor_type == WPA_GET_BE32(&pos[2]))
1609                         return pos;
1610                 pos += 2 + pos[1];
1611         }
1612
1613         return NULL;
1614 }
1615
1616
1617 /**
1618  * wpa_scan_get_vendor_ie_beacon - Fetch vendor information from a scan result
1619  * @res: Scan result entry
1620  * @vendor_type: Vendor type (four octets starting the IE payload)
1621  * Returns: Pointer to the information element (id field) or %NULL if not found
1622  *
1623  * This function returns the first matching information element in the scan
1624  * result.
1625  *
1626  * This function is like wpa_scan_get_vendor_ie(), but uses IE buffer only
1627  * from Beacon frames instead of either Beacon or Probe Response frames.
1628  */
1629 const u8 * wpa_scan_get_vendor_ie_beacon(const struct wpa_scan_res *res,
1630                                          u32 vendor_type)
1631 {
1632         const u8 *end, *pos;
1633
1634         if (res->beacon_ie_len == 0)
1635                 return NULL;
1636
1637         pos = (const u8 *) (res + 1);
1638         pos += res->ie_len;
1639         end = pos + res->beacon_ie_len;
1640
1641         while (end - pos > 1) {
1642                 if (2 + pos[1] > end - pos)
1643                         break;
1644                 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1645                     vendor_type == WPA_GET_BE32(&pos[2]))
1646                         return pos;
1647                 pos += 2 + pos[1];
1648         }
1649
1650         return NULL;
1651 }
1652
1653
1654 /**
1655  * wpa_scan_get_vendor_ie_multi - Fetch vendor IE data from a scan result
1656  * @res: Scan result entry
1657  * @vendor_type: Vendor type (four octets starting the IE payload)
1658  * Returns: Pointer to the information element payload or %NULL if not found
1659  *
1660  * This function returns concatenated payload of possibly fragmented vendor
1661  * specific information elements in the scan result. The caller is responsible
1662  * for freeing the returned buffer.
1663  */
1664 struct wpabuf * wpa_scan_get_vendor_ie_multi(const struct wpa_scan_res *res,
1665                                              u32 vendor_type)
1666 {
1667         struct wpabuf *buf;
1668         const u8 *end, *pos;
1669
1670         buf = wpabuf_alloc(res->ie_len);
1671         if (buf == NULL)
1672                 return NULL;
1673
1674         pos = (const u8 *) (res + 1);
1675         end = pos + res->ie_len;
1676
1677         while (end - pos > 1) {
1678                 if (2 + pos[1] > end - pos)
1679                         break;
1680                 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1681                     vendor_type == WPA_GET_BE32(&pos[2]))
1682                         wpabuf_put_data(buf, pos + 2 + 4, pos[1] - 4);
1683                 pos += 2 + pos[1];
1684         }
1685
1686         if (wpabuf_len(buf) == 0) {
1687                 wpabuf_free(buf);
1688                 buf = NULL;
1689         }
1690
1691         return buf;
1692 }
1693
1694
1695 /*
1696  * Channels with a great SNR can operate at full rate. What is a great SNR?
1697  * This doc https://supportforums.cisco.com/docs/DOC-12954 says, "the general
1698  * rule of thumb is that any SNR above 20 is good." This one
1699  * http://www.cisco.com/en/US/tech/tk722/tk809/technologies_q_and_a_item09186a00805e9a96.shtml#qa23
1700  * recommends 25 as a minimum SNR for 54 Mbps data rate. 30 is chosen here as a
1701  * conservative value.
1702  */
1703 #define GREAT_SNR 30
1704
1705 #define IS_5GHZ(n) (n > 4000)
1706
1707 /* Compare function for sorting scan results. Return >0 if @b is considered
1708  * better. */
1709 static int wpa_scan_result_compar(const void *a, const void *b)
1710 {
1711 #define MIN(a,b) a < b ? a : b
1712         struct wpa_scan_res **_wa = (void *) a;
1713         struct wpa_scan_res **_wb = (void *) b;
1714         struct wpa_scan_res *wa = *_wa;
1715         struct wpa_scan_res *wb = *_wb;
1716         int wpa_a, wpa_b;
1717         int snr_a, snr_b, snr_a_full, snr_b_full;
1718
1719         /* WPA/WPA2 support preferred */
1720         wpa_a = wpa_scan_get_vendor_ie(wa, WPA_IE_VENDOR_TYPE) != NULL ||
1721                 wpa_scan_get_ie(wa, WLAN_EID_RSN) != NULL;
1722         wpa_b = wpa_scan_get_vendor_ie(wb, WPA_IE_VENDOR_TYPE) != NULL ||
1723                 wpa_scan_get_ie(wb, WLAN_EID_RSN) != NULL;
1724
1725         if (wpa_b && !wpa_a)
1726                 return 1;
1727         if (!wpa_b && wpa_a)
1728                 return -1;
1729
1730         /* privacy support preferred */
1731         if ((wa->caps & IEEE80211_CAP_PRIVACY) == 0 &&
1732             (wb->caps & IEEE80211_CAP_PRIVACY))
1733                 return 1;
1734         if ((wa->caps & IEEE80211_CAP_PRIVACY) &&
1735             (wb->caps & IEEE80211_CAP_PRIVACY) == 0)
1736                 return -1;
1737
1738         if (wa->flags & wb->flags & WPA_SCAN_LEVEL_DBM) {
1739                 snr_a_full = wa->snr;
1740                 snr_a = MIN(wa->snr, GREAT_SNR);
1741                 snr_b_full = wb->snr;
1742                 snr_b = MIN(wb->snr, GREAT_SNR);
1743         } else {
1744                 /* Level is not in dBm, so we can't calculate
1745                  * SNR. Just use raw level (units unknown). */
1746                 snr_a = snr_a_full = wa->level;
1747                 snr_b = snr_b_full = wb->level;
1748         }
1749
1750         /* if SNR is close, decide by max rate or frequency band */
1751         if ((snr_a && snr_b && abs(snr_b - snr_a) < 5) ||
1752             (wa->qual && wb->qual && abs(wb->qual - wa->qual) < 10)) {
1753                 if (wa->est_throughput != wb->est_throughput)
1754                         return wb->est_throughput - wa->est_throughput;
1755                 if (IS_5GHZ(wa->freq) ^ IS_5GHZ(wb->freq))
1756                         return IS_5GHZ(wa->freq) ? -1 : 1;
1757         }
1758
1759         /* all things being equal, use SNR; if SNRs are
1760          * identical, use quality values since some drivers may only report
1761          * that value and leave the signal level zero */
1762         if (snr_b_full == snr_a_full)
1763                 return wb->qual - wa->qual;
1764         return snr_b_full - snr_a_full;
1765 #undef MIN
1766 }
1767
1768
1769 #ifdef CONFIG_WPS
1770 /* Compare function for sorting scan results when searching a WPS AP for
1771  * provisioning. Return >0 if @b is considered better. */
1772 static int wpa_scan_result_wps_compar(const void *a, const void *b)
1773 {
1774         struct wpa_scan_res **_wa = (void *) a;
1775         struct wpa_scan_res **_wb = (void *) b;
1776         struct wpa_scan_res *wa = *_wa;
1777         struct wpa_scan_res *wb = *_wb;
1778         int uses_wps_a, uses_wps_b;
1779         struct wpabuf *wps_a, *wps_b;
1780         int res;
1781
1782         /* Optimization - check WPS IE existence before allocated memory and
1783          * doing full reassembly. */
1784         uses_wps_a = wpa_scan_get_vendor_ie(wa, WPS_IE_VENDOR_TYPE) != NULL;
1785         uses_wps_b = wpa_scan_get_vendor_ie(wb, WPS_IE_VENDOR_TYPE) != NULL;
1786         if (uses_wps_a && !uses_wps_b)
1787                 return -1;
1788         if (!uses_wps_a && uses_wps_b)
1789                 return 1;
1790
1791         if (uses_wps_a && uses_wps_b) {
1792                 wps_a = wpa_scan_get_vendor_ie_multi(wa, WPS_IE_VENDOR_TYPE);
1793                 wps_b = wpa_scan_get_vendor_ie_multi(wb, WPS_IE_VENDOR_TYPE);
1794                 res = wps_ap_priority_compar(wps_a, wps_b);
1795                 wpabuf_free(wps_a);
1796                 wpabuf_free(wps_b);
1797                 if (res)
1798                         return res;
1799         }
1800
1801         /*
1802          * Do not use current AP security policy as a sorting criteria during
1803          * WPS provisioning step since the AP may get reconfigured at the
1804          * completion of provisioning.
1805          */
1806
1807         /* all things being equal, use signal level; if signal levels are
1808          * identical, use quality values since some drivers may only report
1809          * that value and leave the signal level zero */
1810         if (wb->level == wa->level)
1811                 return wb->qual - wa->qual;
1812         return wb->level - wa->level;
1813 }
1814 #endif /* CONFIG_WPS */
1815
1816
1817 static void dump_scan_res(struct wpa_scan_results *scan_res)
1818 {
1819 #ifndef CONFIG_NO_STDOUT_DEBUG
1820         size_t i;
1821
1822         if (scan_res->res == NULL || scan_res->num == 0)
1823                 return;
1824
1825         wpa_printf(MSG_EXCESSIVE, "Sorted scan results");
1826
1827         for (i = 0; i < scan_res->num; i++) {
1828                 struct wpa_scan_res *r = scan_res->res[i];
1829                 u8 *pos;
1830                 if (r->flags & WPA_SCAN_LEVEL_DBM) {
1831                         int noise_valid = !(r->flags & WPA_SCAN_NOISE_INVALID);
1832
1833                         wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d "
1834                                    "noise=%d%s level=%d snr=%d%s flags=0x%x age=%u est=%u",
1835                                    MAC2STR(r->bssid), r->freq, r->qual,
1836                                    r->noise, noise_valid ? "" : "~", r->level,
1837                                    r->snr, r->snr >= GREAT_SNR ? "*" : "",
1838                                    r->flags,
1839                                    r->age, r->est_throughput);
1840                 } else {
1841                         wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d "
1842                                    "noise=%d level=%d flags=0x%x age=%u est=%u",
1843                                    MAC2STR(r->bssid), r->freq, r->qual,
1844                                    r->noise, r->level, r->flags, r->age,
1845                                    r->est_throughput);
1846                 }
1847                 pos = (u8 *) (r + 1);
1848                 if (r->ie_len)
1849                         wpa_hexdump(MSG_EXCESSIVE, "IEs", pos, r->ie_len);
1850                 pos += r->ie_len;
1851                 if (r->beacon_ie_len)
1852                         wpa_hexdump(MSG_EXCESSIVE, "Beacon IEs",
1853                                     pos, r->beacon_ie_len);
1854         }
1855 #endif /* CONFIG_NO_STDOUT_DEBUG */
1856 }
1857
1858
1859 /**
1860  * wpa_supplicant_filter_bssid_match - Is the specified BSSID allowed
1861  * @wpa_s: Pointer to wpa_supplicant data
1862  * @bssid: BSSID to check
1863  * Returns: 0 if the BSSID is filtered or 1 if not
1864  *
1865  * This function is used to filter out specific BSSIDs from scan reslts mainly
1866  * for testing purposes (SET bssid_filter ctrl_iface command).
1867  */
1868 int wpa_supplicant_filter_bssid_match(struct wpa_supplicant *wpa_s,
1869                                       const u8 *bssid)
1870 {
1871         size_t i;
1872
1873         if (wpa_s->bssid_filter == NULL)
1874                 return 1;
1875
1876         for (i = 0; i < wpa_s->bssid_filter_count; i++) {
1877                 if (os_memcmp(wpa_s->bssid_filter + i * ETH_ALEN, bssid,
1878                               ETH_ALEN) == 0)
1879                         return 1;
1880         }
1881
1882         return 0;
1883 }
1884
1885
1886 void filter_scan_res(struct wpa_supplicant *wpa_s,
1887                      struct wpa_scan_results *res)
1888 {
1889         size_t i, j;
1890
1891         if (wpa_s->bssid_filter == NULL)
1892                 return;
1893
1894         for (i = 0, j = 0; i < res->num; i++) {
1895                 if (wpa_supplicant_filter_bssid_match(wpa_s,
1896                                                       res->res[i]->bssid)) {
1897                         res->res[j++] = res->res[i];
1898                 } else {
1899                         os_free(res->res[i]);
1900                         res->res[i] = NULL;
1901                 }
1902         }
1903
1904         if (res->num != j) {
1905                 wpa_printf(MSG_DEBUG, "Filtered out %d scan results",
1906                            (int) (res->num - j));
1907                 res->num = j;
1908         }
1909 }
1910
1911
1912 /*
1913  * Noise floor values to use when we have signal strength
1914  * measurements, but no noise floor measurements. These values were
1915  * measured in an office environment with many APs.
1916  */
1917 #define DEFAULT_NOISE_FLOOR_2GHZ (-89)
1918 #define DEFAULT_NOISE_FLOOR_5GHZ (-92)
1919
1920 void scan_snr(struct wpa_scan_res *res)
1921 {
1922         if (res->flags & WPA_SCAN_NOISE_INVALID) {
1923                 res->noise = IS_5GHZ(res->freq) ?
1924                         DEFAULT_NOISE_FLOOR_5GHZ :
1925                         DEFAULT_NOISE_FLOOR_2GHZ;
1926         }
1927
1928         if (res->flags & WPA_SCAN_LEVEL_DBM) {
1929                 res->snr = res->level - res->noise;
1930         } else {
1931                 /* Level is not in dBm, so we can't calculate
1932                  * SNR. Just use raw level (units unknown). */
1933                 res->snr = res->level;
1934         }
1935 }
1936
1937
1938 static unsigned int max_ht20_rate(int snr)
1939 {
1940         if (snr < 6)
1941                 return 6500; /* HT20 MCS0 */
1942         if (snr < 8)
1943                 return 13000; /* HT20 MCS1 */
1944         if (snr < 13)
1945                 return 19500; /* HT20 MCS2 */
1946         if (snr < 17)
1947                 return 26000; /* HT20 MCS3 */
1948         if (snr < 20)
1949                 return 39000; /* HT20 MCS4 */
1950         if (snr < 23)
1951                 return 52000; /* HT20 MCS5 */
1952         if (snr < 24)
1953                 return 58500; /* HT20 MCS6 */
1954         return 65000; /* HT20 MCS7 */
1955 }
1956
1957
1958 static unsigned int max_ht40_rate(int snr)
1959 {
1960         if (snr < 3)
1961                 return 13500; /* HT40 MCS0 */
1962         if (snr < 6)
1963                 return 27000; /* HT40 MCS1 */
1964         if (snr < 10)
1965                 return 40500; /* HT40 MCS2 */
1966         if (snr < 15)
1967                 return 54000; /* HT40 MCS3 */
1968         if (snr < 17)
1969                 return 81000; /* HT40 MCS4 */
1970         if (snr < 22)
1971                 return 108000; /* HT40 MCS5 */
1972         if (snr < 24)
1973                 return 121500; /* HT40 MCS6 */
1974         return 135000; /* HT40 MCS7 */
1975 }
1976
1977
1978 static unsigned int max_vht80_rate(int snr)
1979 {
1980         if (snr < 1)
1981                 return 0;
1982         if (snr < 2)
1983                 return 29300; /* VHT80 MCS0 */
1984         if (snr < 5)
1985                 return 58500; /* VHT80 MCS1 */
1986         if (snr < 9)
1987                 return 87800; /* VHT80 MCS2 */
1988         if (snr < 11)
1989                 return 117000; /* VHT80 MCS3 */
1990         if (snr < 15)
1991                 return 175500; /* VHT80 MCS4 */
1992         if (snr < 16)
1993                 return 234000; /* VHT80 MCS5 */
1994         if (snr < 18)
1995                 return 263300; /* VHT80 MCS6 */
1996         if (snr < 20)
1997                 return 292500; /* VHT80 MCS7 */
1998         if (snr < 22)
1999                 return 351000; /* VHT80 MCS8 */
2000         return 390000; /* VHT80 MCS9 */
2001 }
2002
2003
2004 void scan_est_throughput(struct wpa_supplicant *wpa_s,
2005                          struct wpa_scan_res *res)
2006 {
2007         enum local_hw_capab capab = wpa_s->hw_capab;
2008         int rate; /* max legacy rate in 500 kb/s units */
2009         const u8 *ie;
2010         unsigned int est, tmp;
2011         int snr = res->snr;
2012
2013         if (res->est_throughput)
2014                 return;
2015
2016         /* Get maximum legacy rate */
2017         rate = wpa_scan_get_max_rate(res);
2018
2019         /* Limit based on estimated SNR */
2020         if (rate > 1 * 2 && snr < 1)
2021                 rate = 1 * 2;
2022         else if (rate > 2 * 2 && snr < 4)
2023                 rate = 2 * 2;
2024         else if (rate > 6 * 2 && snr < 5)
2025                 rate = 6 * 2;
2026         else if (rate > 9 * 2 && snr < 6)
2027                 rate = 9 * 2;
2028         else if (rate > 12 * 2 && snr < 7)
2029                 rate = 12 * 2;
2030         else if (rate > 18 * 2 && snr < 10)
2031                 rate = 18 * 2;
2032         else if (rate > 24 * 2 && snr < 11)
2033                 rate = 24 * 2;
2034         else if (rate > 36 * 2 && snr < 15)
2035                 rate = 36 * 2;
2036         else if (rate > 48 * 2 && snr < 19)
2037                 rate = 48 * 2;
2038         else if (rate > 54 * 2 && snr < 21)
2039                 rate = 54 * 2;
2040         est = rate * 500;
2041
2042         if (capab == CAPAB_HT || capab == CAPAB_HT40 || capab == CAPAB_VHT) {
2043                 ie = wpa_scan_get_ie(res, WLAN_EID_HT_CAP);
2044                 if (ie) {
2045                         tmp = max_ht20_rate(snr);
2046                         if (tmp > est)
2047                                 est = tmp;
2048                 }
2049         }
2050
2051         if (capab == CAPAB_HT40 || capab == CAPAB_VHT) {
2052                 ie = wpa_scan_get_ie(res, WLAN_EID_HT_OPERATION);
2053                 if (ie && ie[1] >= 2 &&
2054                     (ie[3] & HT_INFO_HT_PARAM_SECONDARY_CHNL_OFF_MASK)) {
2055                         tmp = max_ht40_rate(snr);
2056                         if (tmp > est)
2057                                 est = tmp;
2058                 }
2059         }
2060
2061         if (capab == CAPAB_VHT) {
2062                 /* Use +1 to assume VHT is always faster than HT */
2063                 ie = wpa_scan_get_ie(res, WLAN_EID_VHT_CAP);
2064                 if (ie) {
2065                         tmp = max_ht20_rate(snr) + 1;
2066                         if (tmp > est)
2067                                 est = tmp;
2068
2069                         ie = wpa_scan_get_ie(res, WLAN_EID_HT_OPERATION);
2070                         if (ie && ie[1] >= 2 &&
2071                             (ie[3] &
2072                              HT_INFO_HT_PARAM_SECONDARY_CHNL_OFF_MASK)) {
2073                                 tmp = max_ht40_rate(snr) + 1;
2074                                 if (tmp > est)
2075                                         est = tmp;
2076                         }
2077
2078                         ie = wpa_scan_get_ie(res, WLAN_EID_VHT_OPERATION);
2079                         if (ie && ie[1] >= 1 &&
2080                             (ie[2] & VHT_OPMODE_CHANNEL_WIDTH_MASK)) {
2081                                 tmp = max_vht80_rate(snr) + 1;
2082                                 if (tmp > est)
2083                                         est = tmp;
2084                         }
2085                 }
2086         }
2087
2088         /* TODO: channel utilization and AP load (e.g., from AP Beacon) */
2089
2090         res->est_throughput = est;
2091 }
2092
2093
2094 /**
2095  * wpa_supplicant_get_scan_results - Get scan results
2096  * @wpa_s: Pointer to wpa_supplicant data
2097  * @info: Information about what was scanned or %NULL if not available
2098  * @new_scan: Whether a new scan was performed
2099  * Returns: Scan results, %NULL on failure
2100  *
2101  * This function request the current scan results from the driver and updates
2102  * the local BSS list wpa_s->bss. The caller is responsible for freeing the
2103  * results with wpa_scan_results_free().
2104  */
2105 struct wpa_scan_results *
2106 wpa_supplicant_get_scan_results(struct wpa_supplicant *wpa_s,
2107                                 struct scan_info *info, int new_scan)
2108 {
2109         struct wpa_scan_results *scan_res;
2110         size_t i;
2111         int (*compar)(const void *, const void *) = wpa_scan_result_compar;
2112
2113         scan_res = wpa_drv_get_scan_results2(wpa_s);
2114         if (scan_res == NULL) {
2115                 wpa_dbg(wpa_s, MSG_DEBUG, "Failed to get scan results");
2116                 return NULL;
2117         }
2118         if (scan_res->fetch_time.sec == 0) {
2119                 /*
2120                  * Make sure we have a valid timestamp if the driver wrapper
2121                  * does not set this.
2122                  */
2123                 os_get_reltime(&scan_res->fetch_time);
2124         }
2125         filter_scan_res(wpa_s, scan_res);
2126
2127         for (i = 0; i < scan_res->num; i++) {
2128                 struct wpa_scan_res *scan_res_item = scan_res->res[i];
2129
2130                 scan_snr(scan_res_item);
2131                 scan_est_throughput(wpa_s, scan_res_item);
2132         }
2133
2134 #ifdef CONFIG_WPS
2135         if (wpas_wps_searching(wpa_s)) {
2136                 wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Order scan results with WPS "
2137                         "provisioning rules");
2138                 compar = wpa_scan_result_wps_compar;
2139         }
2140 #endif /* CONFIG_WPS */
2141
2142         qsort(scan_res->res, scan_res->num, sizeof(struct wpa_scan_res *),
2143               compar);
2144         dump_scan_res(scan_res);
2145
2146         wpa_bss_update_start(wpa_s);
2147         for (i = 0; i < scan_res->num; i++)
2148                 wpa_bss_update_scan_res(wpa_s, scan_res->res[i],
2149                                         &scan_res->fetch_time);
2150         wpa_bss_update_end(wpa_s, info, new_scan);
2151
2152         return scan_res;
2153 }
2154
2155
2156 /**
2157  * wpa_supplicant_update_scan_results - Update scan results from the driver
2158  * @wpa_s: Pointer to wpa_supplicant data
2159  * Returns: 0 on success, -1 on failure
2160  *
2161  * This function updates the BSS table within wpa_supplicant based on the
2162  * currently available scan results from the driver without requesting a new
2163  * scan. This is used in cases where the driver indicates an association
2164  * (including roaming within ESS) and wpa_supplicant does not yet have the
2165  * needed information to complete the connection (e.g., to perform validation
2166  * steps in 4-way handshake).
2167  */
2168 int wpa_supplicant_update_scan_results(struct wpa_supplicant *wpa_s)
2169 {
2170         struct wpa_scan_results *scan_res;
2171         scan_res = wpa_supplicant_get_scan_results(wpa_s, NULL, 0);
2172         if (scan_res == NULL)
2173                 return -1;
2174         wpa_scan_results_free(scan_res);
2175
2176         return 0;
2177 }
2178
2179
2180 /**
2181  * scan_only_handler - Reports scan results
2182  */
2183 void scan_only_handler(struct wpa_supplicant *wpa_s,
2184                        struct wpa_scan_results *scan_res)
2185 {
2186         wpa_dbg(wpa_s, MSG_DEBUG, "Scan-only results received");
2187         if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
2188             wpa_s->manual_scan_use_id && wpa_s->own_scan_running) {
2189                 wpa_msg_ctrl(wpa_s, MSG_INFO, WPA_EVENT_SCAN_RESULTS "id=%u",
2190                              wpa_s->manual_scan_id);
2191                 wpa_s->manual_scan_use_id = 0;
2192         } else {
2193                 wpa_msg_ctrl(wpa_s, MSG_INFO, WPA_EVENT_SCAN_RESULTS);
2194         }
2195         wpas_notify_scan_results(wpa_s);
2196         wpas_notify_scan_done(wpa_s, 1);
2197         if (wpa_s->scan_work) {
2198                 struct wpa_radio_work *work = wpa_s->scan_work;
2199                 wpa_s->scan_work = NULL;
2200                 radio_work_done(work);
2201         }
2202
2203         if (wpa_s->wpa_state == WPA_SCANNING)
2204                 wpa_supplicant_set_state(wpa_s, wpa_s->scan_prev_wpa_state);
2205 }
2206
2207
2208 int wpas_scan_scheduled(struct wpa_supplicant *wpa_s)
2209 {
2210         return eloop_is_timeout_registered(wpa_supplicant_scan, wpa_s, NULL);
2211 }
2212
2213
2214 struct wpa_driver_scan_params *
2215 wpa_scan_clone_params(const struct wpa_driver_scan_params *src)
2216 {
2217         struct wpa_driver_scan_params *params;
2218         size_t i;
2219         u8 *n;
2220
2221         params = os_zalloc(sizeof(*params));
2222         if (params == NULL)
2223                 return NULL;
2224
2225         for (i = 0; i < src->num_ssids; i++) {
2226                 if (src->ssids[i].ssid) {
2227                         n = os_malloc(src->ssids[i].ssid_len);
2228                         if (n == NULL)
2229                                 goto failed;
2230                         os_memcpy(n, src->ssids[i].ssid,
2231                                   src->ssids[i].ssid_len);
2232                         params->ssids[i].ssid = n;
2233                         params->ssids[i].ssid_len = src->ssids[i].ssid_len;
2234                 }
2235         }
2236         params->num_ssids = src->num_ssids;
2237
2238         if (src->extra_ies) {
2239                 n = os_malloc(src->extra_ies_len);
2240                 if (n == NULL)
2241                         goto failed;
2242                 os_memcpy(n, src->extra_ies, src->extra_ies_len);
2243                 params->extra_ies = n;
2244                 params->extra_ies_len = src->extra_ies_len;
2245         }
2246
2247         if (src->freqs) {
2248                 int len = int_array_len(src->freqs);
2249                 params->freqs = os_malloc((len + 1) * sizeof(int));
2250                 if (params->freqs == NULL)
2251                         goto failed;
2252                 os_memcpy(params->freqs, src->freqs, (len + 1) * sizeof(int));
2253         }
2254
2255         if (src->filter_ssids) {
2256                 params->filter_ssids = os_malloc(sizeof(*params->filter_ssids) *
2257                                                  src->num_filter_ssids);
2258                 if (params->filter_ssids == NULL)
2259                         goto failed;
2260                 os_memcpy(params->filter_ssids, src->filter_ssids,
2261                           sizeof(*params->filter_ssids) *
2262                           src->num_filter_ssids);
2263                 params->num_filter_ssids = src->num_filter_ssids;
2264         }
2265
2266         params->filter_rssi = src->filter_rssi;
2267         params->p2p_probe = src->p2p_probe;
2268         params->only_new_results = src->only_new_results;
2269         params->low_priority = src->low_priority;
2270
2271         if (src->sched_scan_plans_num > 0) {
2272                 params->sched_scan_plans =
2273                         os_malloc(sizeof(*src->sched_scan_plans) *
2274                                   src->sched_scan_plans_num);
2275                 if (!params->sched_scan_plans)
2276                         goto failed;
2277
2278                 os_memcpy(params->sched_scan_plans, src->sched_scan_plans,
2279                           sizeof(*src->sched_scan_plans) *
2280                           src->sched_scan_plans_num);
2281                 params->sched_scan_plans_num = src->sched_scan_plans_num;
2282         }
2283
2284         if (src->mac_addr_rand) {
2285                 params->mac_addr_rand = src->mac_addr_rand;
2286
2287                 if (src->mac_addr && src->mac_addr_mask) {
2288                         u8 *mac_addr;
2289
2290                         mac_addr = os_malloc(2 * ETH_ALEN);
2291                         if (!mac_addr)
2292                                 goto failed;
2293
2294                         os_memcpy(mac_addr, src->mac_addr, ETH_ALEN);
2295                         os_memcpy(mac_addr + ETH_ALEN, src->mac_addr_mask,
2296                                   ETH_ALEN);
2297                         params->mac_addr = mac_addr;
2298                         params->mac_addr_mask = mac_addr + ETH_ALEN;
2299                 }
2300         }
2301
2302         if (src->bssid) {
2303                 u8 *bssid;
2304
2305                 bssid = os_malloc(ETH_ALEN);
2306                 if (!bssid)
2307                         goto failed;
2308                 os_memcpy(bssid, src->bssid, ETH_ALEN);
2309                 params->bssid = bssid;
2310         }
2311
2312         return params;
2313
2314 failed:
2315         wpa_scan_free_params(params);
2316         return NULL;
2317 }
2318
2319
2320 void wpa_scan_free_params(struct wpa_driver_scan_params *params)
2321 {
2322         size_t i;
2323
2324         if (params == NULL)
2325                 return;
2326
2327         for (i = 0; i < params->num_ssids; i++)
2328                 os_free((u8 *) params->ssids[i].ssid);
2329         os_free((u8 *) params->extra_ies);
2330         os_free(params->freqs);
2331         os_free(params->filter_ssids);
2332         os_free(params->sched_scan_plans);
2333
2334         /*
2335          * Note: params->mac_addr_mask points to same memory allocation and
2336          * must not be freed separately.
2337          */
2338         os_free((u8 *) params->mac_addr);
2339
2340         os_free((u8 *) params->bssid);
2341
2342         os_free(params);
2343 }
2344
2345
2346 int wpas_start_pno(struct wpa_supplicant *wpa_s)
2347 {
2348         int ret, prio;
2349         size_t i, num_ssid, num_match_ssid;
2350         struct wpa_ssid *ssid;
2351         struct wpa_driver_scan_params params;
2352         struct sched_scan_plan scan_plan;
2353         unsigned int max_sched_scan_ssids;
2354
2355         if (!wpa_s->sched_scan_supported)
2356                 return -1;
2357
2358         if (wpa_s->max_sched_scan_ssids > WPAS_MAX_SCAN_SSIDS)
2359                 max_sched_scan_ssids = WPAS_MAX_SCAN_SSIDS;
2360         else
2361                 max_sched_scan_ssids = wpa_s->max_sched_scan_ssids;
2362         if (max_sched_scan_ssids < 1)
2363                 return -1;
2364
2365         if (wpa_s->pno || wpa_s->pno_sched_pending)
2366                 return 0;
2367
2368         if ((wpa_s->wpa_state > WPA_SCANNING) &&
2369             (wpa_s->wpa_state <= WPA_COMPLETED)) {
2370                 wpa_printf(MSG_ERROR, "PNO: In assoc process");
2371                 return -EAGAIN;
2372         }
2373
2374         if (wpa_s->wpa_state == WPA_SCANNING) {
2375                 wpa_supplicant_cancel_scan(wpa_s);
2376                 if (wpa_s->sched_scanning) {
2377                         wpa_printf(MSG_DEBUG, "Schedule PNO on completion of "
2378                                    "ongoing sched scan");
2379                         wpa_supplicant_cancel_sched_scan(wpa_s);
2380                         wpa_s->pno_sched_pending = 1;
2381                         return 0;
2382                 }
2383         }
2384
2385         os_memset(&params, 0, sizeof(params));
2386
2387         num_ssid = num_match_ssid = 0;
2388         ssid = wpa_s->conf->ssid;
2389         while (ssid) {
2390                 if (!wpas_network_disabled(wpa_s, ssid)) {
2391                         num_match_ssid++;
2392                         if (ssid->scan_ssid)
2393                                 num_ssid++;
2394                 }
2395                 ssid = ssid->next;
2396         }
2397
2398         if (num_match_ssid == 0) {
2399                 wpa_printf(MSG_DEBUG, "PNO: No configured SSIDs");
2400                 return -1;
2401         }
2402
2403         if (num_match_ssid > num_ssid) {
2404                 params.num_ssids++; /* wildcard */
2405                 num_ssid++;
2406         }
2407
2408         if (num_ssid > max_sched_scan_ssids) {
2409                 wpa_printf(MSG_DEBUG, "PNO: Use only the first %u SSIDs from "
2410                            "%u", max_sched_scan_ssids, (unsigned int) num_ssid);
2411                 num_ssid = max_sched_scan_ssids;
2412         }
2413
2414         if (num_match_ssid > wpa_s->max_match_sets) {
2415                 num_match_ssid = wpa_s->max_match_sets;
2416                 wpa_dbg(wpa_s, MSG_DEBUG, "PNO: Too many SSIDs to match");
2417         }
2418         params.filter_ssids = os_calloc(num_match_ssid,
2419                                         sizeof(struct wpa_driver_scan_filter));
2420         if (params.filter_ssids == NULL)
2421                 return -1;
2422
2423         i = 0;
2424         prio = 0;
2425         ssid = wpa_s->conf->pssid[prio];
2426         while (ssid) {
2427                 if (!wpas_network_disabled(wpa_s, ssid)) {
2428                         if (ssid->scan_ssid && params.num_ssids < num_ssid) {
2429                                 params.ssids[params.num_ssids].ssid =
2430                                         ssid->ssid;
2431                                 params.ssids[params.num_ssids].ssid_len =
2432                                          ssid->ssid_len;
2433                                 params.num_ssids++;
2434                         }
2435                         os_memcpy(params.filter_ssids[i].ssid, ssid->ssid,
2436                                   ssid->ssid_len);
2437                         params.filter_ssids[i].ssid_len = ssid->ssid_len;
2438                         params.num_filter_ssids++;
2439                         i++;
2440                         if (i == num_match_ssid)
2441                                 break;
2442                 }
2443                 if (ssid->pnext)
2444                         ssid = ssid->pnext;
2445                 else if (prio + 1 == wpa_s->conf->num_prio)
2446                         break;
2447                 else
2448                         ssid = wpa_s->conf->pssid[++prio];
2449         }
2450
2451         if (wpa_s->conf->filter_rssi)
2452                 params.filter_rssi = wpa_s->conf->filter_rssi;
2453
2454         if (wpa_s->sched_scan_plans_num) {
2455                 params.sched_scan_plans = wpa_s->sched_scan_plans;
2456                 params.sched_scan_plans_num = wpa_s->sched_scan_plans_num;
2457         } else {
2458                 /* Set one scan plan that will run infinitely */
2459                 if (wpa_s->conf->sched_scan_interval)
2460                         scan_plan.interval = wpa_s->conf->sched_scan_interval;
2461                 else
2462                         scan_plan.interval = 10;
2463
2464                 scan_plan.iterations = 0;
2465                 params.sched_scan_plans = &scan_plan;
2466                 params.sched_scan_plans_num = 1;
2467         }
2468
2469         if (params.freqs == NULL && wpa_s->manual_sched_scan_freqs) {
2470                 wpa_dbg(wpa_s, MSG_DEBUG, "Limit sched scan to specified channels");
2471                 params.freqs = wpa_s->manual_sched_scan_freqs;
2472         }
2473
2474         if (wpa_s->mac_addr_rand_enable & MAC_ADDR_RAND_PNO) {
2475                 params.mac_addr_rand = 1;
2476                 if (wpa_s->mac_addr_pno) {
2477                         params.mac_addr = wpa_s->mac_addr_pno;
2478                         params.mac_addr_mask = wpa_s->mac_addr_pno + ETH_ALEN;
2479                 }
2480         }
2481
2482         ret = wpa_supplicant_start_sched_scan(wpa_s, &params);
2483         os_free(params.filter_ssids);
2484         if (ret == 0)
2485                 wpa_s->pno = 1;
2486         else
2487                 wpa_msg(wpa_s, MSG_ERROR, "Failed to schedule PNO");
2488         return ret;
2489 }
2490
2491
2492 int wpas_stop_pno(struct wpa_supplicant *wpa_s)
2493 {
2494         int ret = 0;
2495
2496         if (!wpa_s->pno)
2497                 return 0;
2498
2499         ret = wpa_supplicant_stop_sched_scan(wpa_s);
2500
2501         wpa_s->pno = 0;
2502         wpa_s->pno_sched_pending = 0;
2503
2504         if (wpa_s->wpa_state == WPA_SCANNING)
2505                 wpa_supplicant_req_scan(wpa_s, 0, 0);
2506
2507         return ret;
2508 }
2509
2510
2511 void wpas_mac_addr_rand_scan_clear(struct wpa_supplicant *wpa_s,
2512                                     unsigned int type)
2513 {
2514         type &= MAC_ADDR_RAND_ALL;
2515         wpa_s->mac_addr_rand_enable &= ~type;
2516
2517         if (type & MAC_ADDR_RAND_SCAN) {
2518                 os_free(wpa_s->mac_addr_scan);
2519                 wpa_s->mac_addr_scan = NULL;
2520         }
2521
2522         if (type & MAC_ADDR_RAND_SCHED_SCAN) {
2523                 os_free(wpa_s->mac_addr_sched_scan);
2524                 wpa_s->mac_addr_sched_scan = NULL;
2525         }
2526
2527         if (type & MAC_ADDR_RAND_PNO) {
2528                 os_free(wpa_s->mac_addr_pno);
2529                 wpa_s->mac_addr_pno = NULL;
2530         }
2531 }
2532
2533
2534 int wpas_mac_addr_rand_scan_set(struct wpa_supplicant *wpa_s,
2535                                 unsigned int type, const u8 *addr,
2536                                 const u8 *mask)
2537 {
2538         u8 *tmp = NULL;
2539
2540         wpas_mac_addr_rand_scan_clear(wpa_s, type);
2541
2542         if (addr) {
2543                 tmp = os_malloc(2 * ETH_ALEN);
2544                 if (!tmp)
2545                         return -1;
2546                 os_memcpy(tmp, addr, ETH_ALEN);
2547                 os_memcpy(tmp + ETH_ALEN, mask, ETH_ALEN);
2548         }
2549
2550         if (type == MAC_ADDR_RAND_SCAN) {
2551                 wpa_s->mac_addr_scan = tmp;
2552         } else if (type == MAC_ADDR_RAND_SCHED_SCAN) {
2553                 wpa_s->mac_addr_sched_scan = tmp;
2554         } else if (type == MAC_ADDR_RAND_PNO) {
2555                 wpa_s->mac_addr_pno = tmp;
2556         } else {
2557                 wpa_printf(MSG_INFO,
2558                            "scan: Invalid MAC randomization type=0x%x",
2559                            type);
2560                 os_free(tmp);
2561                 return -1;
2562         }
2563
2564         wpa_s->mac_addr_rand_enable |= type;
2565         return 0;
2566 }
2567
2568
2569 int wpas_abort_ongoing_scan(struct wpa_supplicant *wpa_s)
2570 {
2571         int scan_work = !!wpa_s->scan_work;
2572
2573 #ifdef CONFIG_P2P
2574         scan_work |= !!wpa_s->p2p_scan_work;
2575 #endif /* CONFIG_P2P */
2576
2577         if (scan_work && wpa_s->own_scan_running) {
2578                 wpa_dbg(wpa_s, MSG_DEBUG, "Abort an ongoing scan");
2579                 return wpa_drv_abort_scan(wpa_s);
2580         }
2581
2582         return 0;
2583 }
2584
2585
2586 int wpas_sched_scan_plans_set(struct wpa_supplicant *wpa_s, const char *cmd)
2587 {
2588         struct sched_scan_plan *scan_plans = NULL;
2589         const char *token, *context = NULL;
2590         unsigned int num = 0;
2591
2592         if (!cmd)
2593                 return -1;
2594
2595         if (!cmd[0]) {
2596                 wpa_printf(MSG_DEBUG, "Clear sched scan plans");
2597                 os_free(wpa_s->sched_scan_plans);
2598                 wpa_s->sched_scan_plans = NULL;
2599                 wpa_s->sched_scan_plans_num = 0;
2600                 return 0;
2601         }
2602
2603         while ((token = cstr_token(cmd, " ", &context))) {
2604                 int ret;
2605                 struct sched_scan_plan *scan_plan, *n;
2606
2607                 n = os_realloc_array(scan_plans, num + 1, sizeof(*scan_plans));
2608                 if (!n)
2609                         goto fail;
2610
2611                 scan_plans = n;
2612                 scan_plan = &scan_plans[num];
2613                 num++;
2614
2615                 ret = sscanf(token, "%u:%u", &scan_plan->interval,
2616                              &scan_plan->iterations);
2617                 if (ret <= 0 || ret > 2 || !scan_plan->interval) {
2618                         wpa_printf(MSG_ERROR,
2619                                    "Invalid sched scan plan input: %s", token);
2620                         goto fail;
2621                 }
2622
2623                 if (scan_plan->interval > wpa_s->max_sched_scan_plan_interval) {
2624                         wpa_printf(MSG_WARNING,
2625                                    "scan plan %u: Scan interval too long(%u), use the maximum allowed(%u)",
2626                                    num, scan_plan->interval,
2627                                    wpa_s->max_sched_scan_plan_interval);
2628                         scan_plan->interval =
2629                                 wpa_s->max_sched_scan_plan_interval;
2630                 }
2631
2632                 if (ret == 1) {
2633                         scan_plan->iterations = 0;
2634                         break;
2635                 }
2636
2637                 if (!scan_plan->iterations) {
2638                         wpa_printf(MSG_ERROR,
2639                                    "scan plan %u: Number of iterations cannot be zero",
2640                                    num);
2641                         goto fail;
2642                 }
2643
2644                 if (scan_plan->iterations >
2645                     wpa_s->max_sched_scan_plan_iterations) {
2646                         wpa_printf(MSG_WARNING,
2647                                    "scan plan %u: Too many iterations(%u), use the maximum allowed(%u)",
2648                                    num, scan_plan->iterations,
2649                                    wpa_s->max_sched_scan_plan_iterations);
2650                         scan_plan->iterations =
2651                                 wpa_s->max_sched_scan_plan_iterations;
2652                 }
2653
2654                 wpa_printf(MSG_DEBUG,
2655                            "scan plan %u: interval=%u iterations=%u",
2656                            num, scan_plan->interval, scan_plan->iterations);
2657         }
2658
2659         if (!scan_plans) {
2660                 wpa_printf(MSG_ERROR, "Invalid scan plans entry");
2661                 goto fail;
2662         }
2663
2664         if (cstr_token(cmd, " ", &context) || scan_plans[num - 1].iterations) {
2665                 wpa_printf(MSG_ERROR,
2666                            "All scan plans but the last must specify a number of iterations");
2667                 goto fail;
2668         }
2669
2670         wpa_printf(MSG_DEBUG, "scan plan %u (last plan): interval=%u",
2671                    num, scan_plans[num - 1].interval);
2672
2673         if (num > wpa_s->max_sched_scan_plans) {
2674                 wpa_printf(MSG_WARNING,
2675                            "Too many scheduled scan plans (only %u supported)",
2676                            wpa_s->max_sched_scan_plans);
2677                 wpa_printf(MSG_WARNING,
2678                            "Use only the first %u scan plans, and the last one (in infinite loop)",
2679                            wpa_s->max_sched_scan_plans - 1);
2680                 os_memcpy(&scan_plans[wpa_s->max_sched_scan_plans - 1],
2681                           &scan_plans[num - 1], sizeof(*scan_plans));
2682                 num = wpa_s->max_sched_scan_plans;
2683         }
2684
2685         os_free(wpa_s->sched_scan_plans);
2686         wpa_s->sched_scan_plans = scan_plans;
2687         wpa_s->sched_scan_plans_num = num;
2688
2689         return 0;
2690
2691 fail:
2692         os_free(scan_plans);
2693         wpa_printf(MSG_ERROR, "invalid scan plans list");
2694         return -1;
2695 }