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