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
  26
  27 static void wpa_supplicant_gen_assoc_event(struct wpa_supplicant *wpa_s)
  28 {
  29         struct wpa_ssid *ssid;
  30         union wpa_event_data data;
  31
  32         ssid = wpa_supplicant_get_ssid(wpa_s);
  33         if (ssid == NULL)
  34                 return;
  35
  36         if (wpa_s->current_ssid == NULL) {
  37                 wpa_s->current_ssid = ssid;
  38                 if (wpa_s->current_ssid != NULL)
  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)
  63                         continue;
  64
  65                 if (os_strstr(ssid->eap.phase1, "pbc=1"))
  66                         return 2;
  67         }
  68
  69 #ifdef CONFIG_P2P
  70         if (!wpa_s->global->p2p_disabled && wpa_s->global->p2p &&
  71             !wpa_s->conf->p2p_disabled) {
  72                 wpa_s->wps->dev.p2p = 1;
  73                 if (!wps) {
  74                         wps = 1;
  75                         *req_type = WPS_REQ_ENROLLEE_INFO;
  76                 }
  77         }
  78 #endif /* CONFIG_P2P */
  79
  80         return wps;
  81 }
  82 #endif /* CONFIG_WPS */
  83
  84
  85 /**
  86  * wpa_supplicant_enabled_networks - Check whether there are enabled networks
  87  * @wpa_s: Pointer to wpa_supplicant data
  88  * Returns: 0 if no networks are enabled, >0 if networks are enabled
  89  *
  90  * This function is used to figure out whether any networks (or Interworking
  91  * with enabled credentials and auto_interworking) are present in the current
  92  * configuration.
  93  */
  94 int wpa_supplicant_enabled_networks(struct wpa_supplicant *wpa_s)
  95 {
  96         struct wpa_ssid *ssid = wpa_s->conf->ssid;
  97         int count = 0, disabled = 0;
  98         while (ssid) {
  99                 if (!wpas_network_disabled(wpa_s, ssid))
 100                         count++;
 101                 else
 102                         disabled++;
 103                 ssid = ssid->next;
 104         }
 105         if (wpa_s->conf->cred && wpa_s->conf->interworking &&
 106             wpa_s->conf->auto_interworking)
 107                 count++;
 108         if (count == 0 && disabled > 0) {
 109                 wpa_dbg(wpa_s, MSG_DEBUG, "No enabled networks (%d disabled "
 110                         "networks)", disabled);
 111         }
 112         return count;
 113 }
 114
 115
 116 static void wpa_supplicant_assoc_try(struct wpa_supplicant *wpa_s,
 117                                      struct wpa_ssid *ssid)
 118 {
 119         while (ssid) {
 120                 if (!wpas_network_disabled(wpa_s, ssid))
 121                         break;
 122                 ssid = ssid->next;
 123         }
 124
 125         /* ap_scan=2 mode - try to associate with each SSID. */
 126         if (ssid == NULL) {
 127                 wpa_dbg(wpa_s, MSG_DEBUG, "wpa_supplicant_assoc_try: Reached "
 128                         "end of scan list - go back to beginning");
 129                 wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
 130                 wpa_supplicant_req_scan(wpa_s, 0, 0);
 131                 return;
 132         }
 133         if (ssid->next) {
 134                 /* Continue from the next SSID on the next attempt. */
 135                 wpa_s->prev_scan_ssid = ssid;
 136         } else {
 137                 /* Start from the beginning of the SSID list. */
 138                 wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
 139         }
 140         wpa_supplicant_associate(wpa_s, NULL, ssid);
 141 }
 142
 143
 144 static void wpas_trigger_scan_cb(struct wpa_radio_work *work, int deinit)
 145 {
 146         struct wpa_supplicant *wpa_s = work->wpa_s;
 147         struct wpa_driver_scan_params *params = work->ctx;
 148         int ret;
 149
 150         if (deinit) {
 151                 if (!work->started) {
 152                         wpa_scan_free_params(params);
 153                         return;
 154                 }
 155                 wpa_supplicant_notify_scanning(wpa_s, 0);
 156                 wpas_notify_scan_done(wpa_s, 0);
 157                 wpa_s->scan_work = NULL;
 158                 return;
 159         }
 160
 161         wpa_supplicant_notify_scanning(wpa_s, 1);
 162
 163         if (wpa_s->clear_driver_scan_cache)
 164                 params->only_new_results = 1;
 165         ret = wpa_drv_scan(wpa_s, params);
 166         wpa_scan_free_params(params);
 167         work->ctx = NULL;
 168         if (ret) {
 169                 wpa_supplicant_notify_scanning(wpa_s, 0);
 170                 wpas_notify_scan_done(wpa_s, 0);
 171                 radio_work_done(work);
 172                 return;
 173         }
 174
 175         os_get_reltime(&wpa_s->scan_trigger_time);
 176         wpa_s->scan_runs++;
 177         wpa_s->normal_scans++;
 178         wpa_s->own_scan_requested = 1;
 179         wpa_s->clear_driver_scan_cache = 0;
 180         wpa_s->scan_work = work;
 181 }
 182
 183
 184 /**
 185  * wpa_supplicant_trigger_scan - Request driver to start a scan
 186  * @wpa_s: Pointer to wpa_supplicant data
 187  * @params: Scan parameters
 188  * Returns: 0 on success, -1 on failure
 189  */
 190 int wpa_supplicant_trigger_scan(struct wpa_supplicant *wpa_s,
 191                                 struct wpa_driver_scan_params *params)
 192 {
 193         struct wpa_driver_scan_params *ctx;
 194
 195         if (wpa_s->scan_work) {
 196                 wpa_dbg(wpa_s, MSG_INFO, "Reject scan trigger since one is already pending");
 197                 return -1;
 198         }
 199
 200         ctx = wpa_scan_clone_params(params);
 201         if (ctx == NULL)
 202                 return -1;
 203
 204         if (radio_add_work(wpa_s, 0, "scan", 0, wpas_trigger_scan_cb, ctx) < 0)
 205         {
 206                 wpa_scan_free_params(ctx);
 207                 return -1;
 208         }
 209
 210         return 0;
 211 }
 212
 213
 214 static void
 215 wpa_supplicant_delayed_sched_scan_timeout(void *eloop_ctx, void *timeout_ctx)
 216 {
 217         struct wpa_supplicant *wpa_s = eloop_ctx;
 218
 219         wpa_dbg(wpa_s, MSG_DEBUG, "Starting delayed sched scan");
 220
 221         if (wpa_supplicant_req_sched_scan(wpa_s))
 222                 wpa_supplicant_req_scan(wpa_s, 0, 0);
 223 }
 224
 225
 226 static void
 227 wpa_supplicant_sched_scan_timeout(void *eloop_ctx, void *timeout_ctx)
 228 {
 229         struct wpa_supplicant *wpa_s = eloop_ctx;
 230
 231         wpa_dbg(wpa_s, MSG_DEBUG, "Sched scan timeout - stopping it");
 232
 233         wpa_s->sched_scan_timed_out = 1;
 234         wpa_supplicant_cancel_sched_scan(wpa_s);
 235 }
 236
 237
 238 int wpa_supplicant_start_sched_scan(struct wpa_supplicant *wpa_s,
 239                                     struct wpa_driver_scan_params *params,
 240                                     int interval)
 241 {
 242         int ret;
 243
 244         wpa_supplicant_notify_scanning(wpa_s, 1);
 245         ret = wpa_drv_sched_scan(wpa_s, params, interval * 1000);
 246         if (ret)
 247                 wpa_supplicant_notify_scanning(wpa_s, 0);
 248         else
 249                 wpa_s->sched_scanning = 1;
 250
 251         return ret;
 252 }
 253
 254
 255 int wpa_supplicant_stop_sched_scan(struct wpa_supplicant *wpa_s)
 256 {
 257         int ret;
 258
 259         ret = wpa_drv_stop_sched_scan(wpa_s);
 260         if (ret) {
 261                 wpa_dbg(wpa_s, MSG_DEBUG, "stopping sched_scan failed!");
 262                 /* TODO: what to do if stopping fails? */
 263                 return -1;
 264         }
 265
 266         return ret;
 267 }
 268
 269
 270 static struct wpa_driver_scan_filter *
 271 wpa_supplicant_build_filter_ssids(struct wpa_config *conf, size_t *num_ssids)
 272 {
 273         struct wpa_driver_scan_filter *ssids;
 274         struct wpa_ssid *ssid;
 275         size_t count;
 276
 277         *num_ssids = 0;
 278         if (!conf->filter_ssids)
 279                 return NULL;
 280
 281         for (count = 0, ssid = conf->ssid; ssid; ssid = ssid->next) {
 282                 if (ssid->ssid && ssid->ssid_len)
 283                         count++;
 284         }
 285         if (count == 0)
 286                 return NULL;
 287         ssids = os_zalloc(count * sizeof(struct wpa_driver_scan_filter));
 288         if (ssids == NULL)
 289                 return NULL;
 290
 291         for (ssid = conf->ssid; ssid; ssid = ssid->next) {
 292                 if (!ssid->ssid || !ssid->ssid_len)
 293                         continue;
 294                 os_memcpy(ssids[*num_ssids].ssid, ssid->ssid, ssid->ssid_len);
 295                 ssids[*num_ssids].ssid_len = ssid->ssid_len;
 296                 (*num_ssids)++;
 297         }
 298
 299         return ssids;
 300 }
 301
 302
 303 static void wpa_supplicant_optimize_freqs(
 304         struct wpa_supplicant *wpa_s, struct wpa_driver_scan_params *params)
 305 {
 306 #ifdef CONFIG_P2P
 307         if (params->freqs == NULL && wpa_s->p2p_in_provisioning &&
 308             wpa_s->go_params) {
 309                 /* Optimize provisioning state scan based on GO information */
 310                 if (wpa_s->p2p_in_provisioning < 5 &&
 311                     wpa_s->go_params->freq > 0) {
 312                         wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only GO "
 313                                 "preferred frequency %d MHz",
 314                                 wpa_s->go_params->freq);
 315                         params->freqs = os_zalloc(2 * sizeof(int));
 316                         if (params->freqs)
 317                                 params->freqs[0] = wpa_s->go_params->freq;
 318                 } else if (wpa_s->p2p_in_provisioning < 8 &&
 319                            wpa_s->go_params->freq_list[0]) {
 320                         wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only common "
 321                                 "channels");
 322                         int_array_concat(&params->freqs,
 323                                          wpa_s->go_params->freq_list);
 324                         if (params->freqs)
 325                                 int_array_sort_unique(params->freqs);
 326                 }
 327                 wpa_s->p2p_in_provisioning++;
 328         }
 329
 330         if (params->freqs == NULL && wpa_s->p2p_in_invitation) {
 331                 /*
 332                  * Optimize scan based on GO information during persistent
 333                  * group reinvocation
 334                  */
 335                 if (wpa_s->p2p_in_invitation < 5 &&
 336                     wpa_s->p2p_invite_go_freq > 0) {
 337                         wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only GO preferred frequency %d MHz during invitation",
 338                                 wpa_s->p2p_invite_go_freq);
 339                         params->freqs = os_zalloc(2 * sizeof(int));
 340                         if (params->freqs)
 341                                 params->freqs[0] = wpa_s->p2p_invite_go_freq;
 342                 }
 343                 wpa_s->p2p_in_invitation++;
 344                 if (wpa_s->p2p_in_invitation > 20) {
 345                         /*
 346                          * This should not really happen since the variable is
 347                          * cleared on group removal, but if it does happen, make
 348                          * sure we do not get stuck in special invitation scan
 349                          * mode.
 350                          */
 351                         wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Clear p2p_in_invitation");
 352                         wpa_s->p2p_in_invitation = 0;
 353                 }
 354         }
 355 #endif /* CONFIG_P2P */
 356
 357 #ifdef CONFIG_WPS
 358         if (params->freqs == NULL && wpa_s->after_wps && wpa_s->wps_freq) {
 359                 /*
 360                  * Optimize post-provisioning scan based on channel used
 361                  * during provisioning.
 362                  */
 363                 wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Scan only frequency %u MHz "
 364                         "that was used during provisioning", wpa_s->wps_freq);
 365                 params->freqs = os_zalloc(2 * sizeof(int));
 366                 if (params->freqs)
 367                         params->freqs[0] = wpa_s->wps_freq;
 368                 wpa_s->after_wps--;
 369         } else if (wpa_s->after_wps)
 370                 wpa_s->after_wps--;
 371
 372         if (params->freqs == NULL && wpa_s->known_wps_freq && wpa_s->wps_freq)
 373         {
 374                 /* Optimize provisioning scan based on already known channel */
 375                 wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Scan only frequency %u MHz",
 376                         wpa_s->wps_freq);
 377                 params->freqs = os_zalloc(2 * sizeof(int));
 378                 if (params->freqs)
 379                         params->freqs[0] = wpa_s->wps_freq;
 380                 wpa_s->known_wps_freq = 0; /* only do this once */
 381         }
 382 #endif /* CONFIG_WPS */
 383 }
 384
 385
 386 #ifdef CONFIG_INTERWORKING
 387 static void wpas_add_interworking_elements(struct wpa_supplicant *wpa_s,
 388                                            struct wpabuf *buf)
 389 {
 390         if (wpa_s->conf->interworking == 0)
 391                 return;
 392
 393         wpabuf_put_u8(buf, WLAN_EID_EXT_CAPAB);
 394         wpabuf_put_u8(buf, 6);
 395         wpabuf_put_u8(buf, 0x00);
 396         wpabuf_put_u8(buf, 0x00);
 397         wpabuf_put_u8(buf, 0x00);
 398         wpabuf_put_u8(buf, 0x80); /* Bit 31 - Interworking */
 399         wpabuf_put_u8(buf, 0x00);
 400 #ifdef CONFIG_HS20
 401         wpabuf_put_u8(buf, 0x40); /* Bit 46 - WNM-Notification */
 402 #else /* CONFIG_HS20 */
 403         wpabuf_put_u8(buf, 0x00);
 404 #endif /* CONFIG_HS20 */
 405
 406         wpabuf_put_u8(buf, WLAN_EID_INTERWORKING);
 407         wpabuf_put_u8(buf, is_zero_ether_addr(wpa_s->conf->hessid) ? 1 :
 408                       1 + ETH_ALEN);
 409         wpabuf_put_u8(buf, wpa_s->conf->access_network_type);
 410         /* No Venue Info */
 411         if (!is_zero_ether_addr(wpa_s->conf->hessid))
 412                 wpabuf_put_data(buf, wpa_s->conf->hessid, ETH_ALEN);
 413 }
 414 #endif /* CONFIG_INTERWORKING */
 415
 416
 417 static struct wpabuf * wpa_supplicant_extra_ies(struct wpa_supplicant *wpa_s)
 418 {
 419         struct wpabuf *extra_ie = NULL;
 420 #ifdef CONFIG_WPS
 421         int wps = 0;
 422         enum wps_request_type req_type = WPS_REQ_ENROLLEE_INFO;
 423 #endif /* CONFIG_WPS */
 424
 425 #ifdef CONFIG_INTERWORKING
 426         if (wpa_s->conf->interworking &&
 427             wpabuf_resize(&extra_ie, 100) == 0)
 428                 wpas_add_interworking_elements(wpa_s, extra_ie);
 429 #endif /* CONFIG_INTERWORKING */
 430
 431 #ifdef CONFIG_WPS
 432         wps = wpas_wps_in_use(wpa_s, &req_type);
 433
 434         if (wps) {
 435                 struct wpabuf *wps_ie;
 436                 wps_ie = wps_build_probe_req_ie(wps == 2 ? DEV_PW_PUSHBUTTON :
 437                                                 DEV_PW_DEFAULT,
 438                                                 &wpa_s->wps->dev,
 439                                                 wpa_s->wps->uuid, req_type,
 440                                                 0, NULL);
 441                 if (wps_ie) {
 442                         if (wpabuf_resize(&extra_ie, wpabuf_len(wps_ie)) == 0)
 443                                 wpabuf_put_buf(extra_ie, wps_ie);
 444                         wpabuf_free(wps_ie);
 445                 }
 446         }
 447
 448 #ifdef CONFIG_P2P
 449         if (wps) {
 450                 size_t ielen = p2p_scan_ie_buf_len(wpa_s->global->p2p);
 451                 if (wpabuf_resize(&extra_ie, ielen) == 0)
 452                         wpas_p2p_scan_ie(wpa_s, extra_ie);
 453         }
 454 #endif /* CONFIG_P2P */
 455
 456 #endif /* CONFIG_WPS */
 457
 458 #ifdef CONFIG_HS20
 459         if (wpa_s->conf->hs20 && wpabuf_resize(&extra_ie, 7) == 0)
 460                 wpas_hs20_add_indication(extra_ie, -1);
 461 #endif /* CONFIG_HS20 */
 462
 463         return extra_ie;
 464 }
 465
 466
 467 #ifdef CONFIG_P2P
 468
 469 /*
 470  * Check whether there are any enabled networks or credentials that could be
 471  * used for a non-P2P connection.
 472  */
 473 static int non_p2p_network_enabled(struct wpa_supplicant *wpa_s)
 474 {
 475         struct wpa_ssid *ssid;
 476
 477         for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
 478                 if (wpas_network_disabled(wpa_s, ssid))
 479                         continue;
 480                 if (!ssid->p2p_group)
 481                         return 1;
 482         }
 483
 484         if (wpa_s->conf->cred && wpa_s->conf->interworking &&
 485             wpa_s->conf->auto_interworking)
 486                 return 1;
 487
 488         return 0;
 489 }
 490
 491 #endif /* CONFIG_P2P */
 492
 493
 494 static struct hostapd_hw_modes * get_mode(struct hostapd_hw_modes *modes,
 495                                           u16 num_modes,
 496                                           enum hostapd_hw_mode mode)
 497 {
 498         u16 i;
 499
 500         for (i = 0; i < num_modes; i++) {
 501                 if (modes[i].mode == mode)
 502                         return &modes[i];
 503         }
 504
 505         return NULL;
 506 }
 507
 508
 509 static void wpa_setband_scan_freqs_list(struct wpa_supplicant *wpa_s,
 510                                         enum hostapd_hw_mode band,
 511                                         struct wpa_driver_scan_params *params)
 512 {
 513         /* Include only supported channels for the specified band */
 514         struct hostapd_hw_modes *mode;
 515         int count, i;
 516
 517         mode = get_mode(wpa_s->hw.modes, wpa_s->hw.num_modes, band);
 518         if (mode == NULL) {
 519                 /* No channels supported in this band - use empty list */
 520                 params->freqs = os_zalloc(sizeof(int));
 521                 return;
 522         }
 523
 524         params->freqs = os_zalloc((mode->num_channels + 1) * sizeof(int));
 525         if (params->freqs == NULL)
 526                 return;
 527         for (count = 0, i = 0; i < mode->num_channels; i++) {
 528                 if (mode->channels[i].flag & HOSTAPD_CHAN_DISABLED)
 529                         continue;
 530                 params->freqs[count++] = mode->channels[i].freq;
 531         }
 532 }
 533
 534
 535 static void wpa_setband_scan_freqs(struct wpa_supplicant *wpa_s,
 536                                    struct wpa_driver_scan_params *params)
 537 {
 538         if (wpa_s->hw.modes == NULL)
 539                 return; /* unknown what channels the driver supports */
 540         if (params->freqs)
 541                 return; /* already using a limited channel set */
 542         if (wpa_s->setband == WPA_SETBAND_5G)
 543                 wpa_setband_scan_freqs_list(wpa_s, HOSTAPD_MODE_IEEE80211A,
 544                                             params);
 545         else if (wpa_s->setband == WPA_SETBAND_2G)
 546                 wpa_setband_scan_freqs_list(wpa_s, HOSTAPD_MODE_IEEE80211G,
 547                                             params);
 548 }
 549
 550
 551 static void wpa_set_scan_ssids(struct wpa_supplicant *wpa_s,
 552                                struct wpa_driver_scan_params *params,
 553                                size_t max_ssids)
 554 {
 555         unsigned int i;
 556         struct wpa_ssid *ssid;
 557
 558         for (i = 0; i < wpa_s->scan_id_count; i++) {
 559                 unsigned int j;
 560
 561                 ssid = wpa_config_get_network(wpa_s->conf, wpa_s->scan_id[i]);
 562                 if (!ssid || !ssid->scan_ssid)
 563                         continue;
 564
 565                 for (j = 0; j < params->num_ssids; j++) {
 566                         if (params->ssids[j].ssid_len == ssid->ssid_len &&
 567                             params->ssids[j].ssid &&
 568                             os_memcmp(params->ssids[j].ssid, ssid->ssid,
 569                                       ssid->ssid_len) == 0)
 570                                 break;
 571                 }
 572                 if (j < params->num_ssids)
 573                         continue; /* already in the list */
 574
 575                 if (params->num_ssids + 1 > max_ssids) {
 576                         wpa_printf(MSG_DEBUG,
 577                                    "Over max scan SSIDs for manual request");
 578                         break;
 579                 }
 580
 581                 wpa_printf(MSG_DEBUG, "Scan SSID (manual request): %s",
 582                            wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
 583                 params->ssids[params->num_ssids].ssid = ssid->ssid;
 584                 params->ssids[params->num_ssids].ssid_len = ssid->ssid_len;
 585                 params->num_ssids++;
 586         }
 587
 588         wpa_s->scan_id_count = 0;
 589 }
 590
 591
 592 static void wpa_supplicant_scan(void *eloop_ctx, void *timeout_ctx)
 593 {
 594         struct wpa_supplicant *wpa_s = eloop_ctx;
 595         struct wpa_ssid *ssid;
 596         int ret;
 597         struct wpabuf *extra_ie = NULL;
 598         struct wpa_driver_scan_params params;
 599         struct wpa_driver_scan_params *scan_params;
 600         size_t max_ssids;
 601         enum wpa_states prev_state;
 602
 603         if (wpa_s->pno || wpa_s->pno_sched_pending) {
 604                 wpa_dbg(wpa_s, MSG_DEBUG, "Skip scan - PNO is in progress");
 605                 return;
 606         }
 607
 608         if (wpa_s->wpa_state == WPA_INTERFACE_DISABLED) {
 609                 wpa_dbg(wpa_s, MSG_DEBUG, "Skip scan - interface disabled");
 610                 return;
 611         }
 612
 613         if (wpa_s->disconnected && wpa_s->scan_req == NORMAL_SCAN_REQ) {
 614                 wpa_dbg(wpa_s, MSG_DEBUG, "Disconnected - do not scan");
 615                 wpa_supplicant_set_state(wpa_s, WPA_DISCONNECTED);
 616                 return;
 617         }
 618
 619         if (wpa_s->scanning) {
 620                 /*
 621                  * If we are already in scanning state, we shall reschedule the
 622                  * the incoming scan request.
 623                  */
 624                 wpa_dbg(wpa_s, MSG_DEBUG, "Already scanning - Reschedule the incoming scan req");
 625                 wpa_supplicant_req_scan(wpa_s, 1, 0);
 626                 return;
 627         }
 628
 629         if (!wpa_supplicant_enabled_networks(wpa_s) &&
 630             wpa_s->scan_req == NORMAL_SCAN_REQ) {
 631                 wpa_dbg(wpa_s, MSG_DEBUG, "No enabled networks - do not scan");
 632                 wpa_supplicant_set_state(wpa_s, WPA_INACTIVE);
 633                 return;
 634         }
 635
 636         if (wpa_s->conf->ap_scan != 0 &&
 637             (wpa_s->drv_flags & WPA_DRIVER_FLAGS_WIRED)) {
 638                 wpa_dbg(wpa_s, MSG_DEBUG, "Using wired authentication - "
 639                         "overriding ap_scan configuration");
 640                 wpa_s->conf->ap_scan = 0;
 641                 wpas_notify_ap_scan_changed(wpa_s);
 642         }
 643
 644         if (wpa_s->conf->ap_scan == 0) {
 645                 wpa_supplicant_gen_assoc_event(wpa_s);
 646                 return;
 647         }
 648
 649         if (wpas_p2p_in_progress(wpa_s)) {
 650                 wpa_dbg(wpa_s, MSG_DEBUG, "Delay station mode scan while P2P operation is in progress");
 651                 wpa_supplicant_req_scan(wpa_s, 5, 0);
 652                 return;
 653         }
 654
 655         if (wpa_s->conf->ap_scan == 2)
 656                 max_ssids = 1;
 657         else {
 658                 max_ssids = wpa_s->max_scan_ssids;
 659                 if (max_ssids > WPAS_MAX_SCAN_SSIDS)
 660                         max_ssids = WPAS_MAX_SCAN_SSIDS;
 661         }
 662
 663         wpa_s->last_scan_req = wpa_s->scan_req;
 664         wpa_s->scan_req = NORMAL_SCAN_REQ;
 665
 666         os_memset(&params, 0, sizeof(params));
 667
 668         prev_state = wpa_s->wpa_state;
 669         if (wpa_s->wpa_state == WPA_DISCONNECTED ||
 670             wpa_s->wpa_state == WPA_INACTIVE)
 671                 wpa_supplicant_set_state(wpa_s, WPA_SCANNING);
 672
 673         /*
 674          * If autoscan has set its own scanning parameters
 675          */
 676         if (wpa_s->autoscan_params != NULL) {
 677                 scan_params = wpa_s->autoscan_params;
 678                 goto scan;
 679         }
 680
 681         if (wpa_s->last_scan_req != MANUAL_SCAN_REQ &&
 682             wpa_s->connect_without_scan) {
 683                 for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
 684                         if (ssid == wpa_s->connect_without_scan)
 685                                 break;
 686                 }
 687                 wpa_s->connect_without_scan = NULL;
 688                 if (ssid) {
 689                         wpa_printf(MSG_DEBUG, "Start a pre-selected network "
 690                                    "without scan step");
 691                         wpa_supplicant_associate(wpa_s, NULL, ssid);
 692                         return;
 693                 }
 694         }
 695
 696 #ifdef CONFIG_P2P
 697         if ((wpa_s->p2p_in_provisioning || wpa_s->show_group_started) &&
 698             wpa_s->go_params) {
 699                 wpa_printf(MSG_DEBUG, "P2P: Use specific SSID for scan during P2P group formation (p2p_in_provisioning=%d show_group_started=%d)",
 700                            wpa_s->p2p_in_provisioning,
 701                            wpa_s->show_group_started);
 702                 params.ssids[0].ssid = wpa_s->go_params->ssid;
 703                 params.ssids[0].ssid_len = wpa_s->go_params->ssid_len;
 704                 params.num_ssids = 1;
 705                 goto ssid_list_set;
 706         }
 707
 708         if (wpa_s->p2p_in_invitation) {
 709                 if (wpa_s->current_ssid) {
 710                         wpa_printf(MSG_DEBUG, "P2P: Use specific SSID for scan during invitation");
 711                         params.ssids[0].ssid = wpa_s->current_ssid->ssid;
 712                         params.ssids[0].ssid_len =
 713                                 wpa_s->current_ssid->ssid_len;
 714                         params.num_ssids = 1;
 715                 } else {
 716                         wpa_printf(MSG_DEBUG, "P2P: No specific SSID known for scan during invitation");
 717                 }
 718                 goto ssid_list_set;
 719         }
 720 #endif /* CONFIG_P2P */
 721
 722         /* Find the starting point from which to continue scanning */
 723         ssid = wpa_s->conf->ssid;
 724         if (wpa_s->prev_scan_ssid != WILDCARD_SSID_SCAN) {
 725                 while (ssid) {
 726                         if (ssid == wpa_s->prev_scan_ssid) {
 727                                 ssid = ssid->next;
 728                                 break;
 729                         }
 730                         ssid = ssid->next;
 731                 }
 732         }
 733
 734         if (wpa_s->last_scan_req != MANUAL_SCAN_REQ &&
 735             wpa_s->conf->ap_scan == 2) {
 736                 wpa_s->connect_without_scan = NULL;
 737                 wpa_s->prev_scan_wildcard = 0;
 738                 wpa_supplicant_assoc_try(wpa_s, ssid);
 739                 return;
 740         } else if (wpa_s->conf->ap_scan == 2) {
 741                 /*
 742                  * User-initiated scan request in ap_scan == 2; scan with
 743                  * wildcard SSID.
 744                  */
 745                 ssid = NULL;
 746         } else if (wpa_s->reattach && wpa_s->current_ssid != NULL) {
 747                 /*
 748                  * Perform single-channel single-SSID scan for
 749                  * reassociate-to-same-BSS operation.
 750                  */
 751                 /* Setup SSID */
 752                 ssid = wpa_s->current_ssid;
 753                 wpa_hexdump_ascii(MSG_DEBUG, "Scan SSID",
 754                                   ssid->ssid, ssid->ssid_len);
 755                 params.ssids[0].ssid = ssid->ssid;
 756                 params.ssids[0].ssid_len = ssid->ssid_len;
 757                 params.num_ssids = 1;
 758
 759                 /*
 760                  * Allocate memory for frequency array, allocate one extra
 761                  * slot for the zero-terminator.
 762                  */
 763                 params.freqs = os_malloc(sizeof(int) * 2);
 764                 if (params.freqs == NULL) {
 765                         wpa_dbg(wpa_s, MSG_ERROR, "Memory allocation failed");
 766                         return;
 767                 }
 768                 params.freqs[0] = wpa_s->assoc_freq;
 769                 params.freqs[1] = 0;
 770
 771                 /*
 772                  * Reset the reattach flag so that we fall back to full scan if
 773                  * this scan fails.
 774                  */
 775                 wpa_s->reattach = 0;
 776         } else {
 777                 struct wpa_ssid *start = ssid, *tssid;
 778                 int freqs_set = 0;
 779                 if (ssid == NULL && max_ssids > 1)
 780                         ssid = wpa_s->conf->ssid;
 781                 while (ssid) {
 782                         if (!wpas_network_disabled(wpa_s, ssid) &&
 783                             ssid->scan_ssid) {
 784                                 wpa_hexdump_ascii(MSG_DEBUG, "Scan SSID",
 785                                                   ssid->ssid, ssid->ssid_len);
 786                                 params.ssids[params.num_ssids].ssid =
 787                                         ssid->ssid;
 788                                 params.ssids[params.num_ssids].ssid_len =
 789                                         ssid->ssid_len;
 790                                 params.num_ssids++;
 791                                 if (params.num_ssids + 1 >= max_ssids)
 792                                         break;
 793                         }
 794                         ssid = ssid->next;
 795                         if (ssid == start)
 796                                 break;
 797                         if (ssid == NULL && max_ssids > 1 &&
 798                             start != wpa_s->conf->ssid)
 799                                 ssid = wpa_s->conf->ssid;
 800                 }
 801
 802                 if (wpa_s->scan_id_count &&
 803                     wpa_s->last_scan_req == MANUAL_SCAN_REQ)
 804                         wpa_set_scan_ssids(wpa_s, &params, max_ssids);
 805
 806                 for (tssid = wpa_s->conf->ssid; tssid; tssid = tssid->next) {
 807                         if (wpas_network_disabled(wpa_s, tssid))
 808                                 continue;
 809                         if ((params.freqs || !freqs_set) && tssid->scan_freq) {
 810                                 int_array_concat(&params.freqs,
 811                                                  tssid->scan_freq);
 812                         } else {
 813                                 os_free(params.freqs);
 814                                 params.freqs = NULL;
 815                         }
 816                         freqs_set = 1;
 817                 }
 818                 int_array_sort_unique(params.freqs);
 819         }
 820
 821         if (ssid && max_ssids == 1) {
 822                 /*
 823                  * If the driver is limited to 1 SSID at a time interleave
 824                  * wildcard SSID scans with specific SSID scans to avoid
 825                  * waiting a long time for a wildcard scan.
 826                  */
 827                 if (!wpa_s->prev_scan_wildcard) {
 828                         params.ssids[0].ssid = NULL;
 829                         params.ssids[0].ssid_len = 0;
 830                         wpa_s->prev_scan_wildcard = 1;
 831                         wpa_dbg(wpa_s, MSG_DEBUG, "Starting AP scan for "
 832                                 "wildcard SSID (Interleave with specific)");
 833                 } else {
 834                         wpa_s->prev_scan_ssid = ssid;
 835                         wpa_s->prev_scan_wildcard = 0;
 836                         wpa_dbg(wpa_s, MSG_DEBUG,
 837                                 "Starting AP scan for specific SSID: %s",
 838                                 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
 839                 }
 840         } else if (ssid) {
 841                 /* max_ssids > 1 */
 842
 843                 wpa_s->prev_scan_ssid = ssid;
 844                 wpa_dbg(wpa_s, MSG_DEBUG, "Include wildcard SSID in "
 845                         "the scan request");
 846                 params.num_ssids++;
 847         } else if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
 848                    wpa_s->manual_scan_passive && params.num_ssids == 0) {
 849                 wpa_dbg(wpa_s, MSG_DEBUG, "Use passive scan based on manual request");
 850         } else {
 851                 wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
 852                 params.num_ssids++;
 853                 wpa_dbg(wpa_s, MSG_DEBUG, "Starting AP scan for wildcard "
 854                         "SSID");
 855         }
 856 #ifdef CONFIG_P2P
 857 ssid_list_set:
 858 #endif /* CONFIG_P2P */
 859
 860         wpa_supplicant_optimize_freqs(wpa_s, &params);
 861         extra_ie = wpa_supplicant_extra_ies(wpa_s);
 862
 863         if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
 864             wpa_s->manual_scan_only_new)
 865                 params.only_new_results = 1;
 866
 867         if (wpa_s->last_scan_req == MANUAL_SCAN_REQ && params.freqs == NULL &&
 868             wpa_s->manual_scan_freqs) {
 869                 wpa_dbg(wpa_s, MSG_DEBUG, "Limit manual scan to specified channels");
 870                 params.freqs = wpa_s->manual_scan_freqs;
 871                 wpa_s->manual_scan_freqs = NULL;
 872         }
 873
 874         if (params.freqs == NULL && wpa_s->next_scan_freqs) {
 875                 wpa_dbg(wpa_s, MSG_DEBUG, "Optimize scan based on previously "
 876                         "generated frequency list");
 877                 params.freqs = wpa_s->next_scan_freqs;
 878         } else
 879                 os_free(wpa_s->next_scan_freqs);
 880         wpa_s->next_scan_freqs = NULL;
 881         wpa_setband_scan_freqs(wpa_s, &params);
 882
 883         /* See if user specified frequencies. If so, scan only those. */
 884         if (wpa_s->conf->freq_list && !params.freqs) {
 885                 wpa_dbg(wpa_s, MSG_DEBUG,
 886                         "Optimize scan based on conf->freq_list");
 887                 int_array_concat(&params.freqs, wpa_s->conf->freq_list);
 888         }
 889
 890         /* Use current associated channel? */
 891         if (wpa_s->conf->scan_cur_freq && !params.freqs) {
 892                 unsigned int num = wpa_s->num_multichan_concurrent;
 893
 894                 params.freqs = os_calloc(num + 1, sizeof(int));
 895                 if (params.freqs) {
 896                         num = get_shared_radio_freqs(wpa_s, params.freqs, num);
 897                         if (num > 0) {
 898                                 wpa_dbg(wpa_s, MSG_DEBUG, "Scan only the "
 899                                         "current operating channels since "
 900                                         "scan_cur_freq is enabled");
 901                         } else {
 902                                 os_free(params.freqs);
 903                                 params.freqs = NULL;
 904                         }
 905                 }
 906         }
 907
 908         params.filter_ssids = wpa_supplicant_build_filter_ssids(
 909                 wpa_s->conf, &params.num_filter_ssids);
 910         if (extra_ie) {
 911                 params.extra_ies = wpabuf_head(extra_ie);
 912                 params.extra_ies_len = wpabuf_len(extra_ie);
 913         }
 914
 915 #ifdef CONFIG_P2P
 916         if (wpa_s->p2p_in_provisioning || wpa_s->p2p_in_invitation ||
 917             (wpa_s->show_group_started && wpa_s->go_params)) {
 918                 /*
 919                  * The interface may not yet be in P2P mode, so we have to
 920                  * explicitly request P2P probe to disable CCK rates.
 921                  */
 922                 params.p2p_probe = 1;
 923         }
 924 #endif /* CONFIG_P2P */
 925
 926         scan_params = &params;
 927
 928 scan:
 929 #ifdef CONFIG_P2P
 930         /*
 931          * If the driver does not support multi-channel concurrency and a
 932          * virtual interface that shares the same radio with the wpa_s interface
 933          * is operating there may not be need to scan other channels apart from
 934          * the current operating channel on the other virtual interface. Filter
 935          * out other channels in case we are trying to find a connection for a
 936          * station interface when we are not configured to prefer station
 937          * connection and a concurrent operation is already in process.
 938          */
 939         if (wpa_s->scan_for_connection &&
 940             wpa_s->last_scan_req == NORMAL_SCAN_REQ &&
 941             !scan_params->freqs && !params.freqs &&
 942             wpas_is_p2p_prioritized(wpa_s) &&
 943             wpa_s->p2p_group_interface == NOT_P2P_GROUP_INTERFACE &&
 944             non_p2p_network_enabled(wpa_s)) {
 945                 unsigned int num = wpa_s->num_multichan_concurrent;
 946
 947                 params.freqs = os_calloc(num + 1, sizeof(int));
 948                 if (params.freqs) {
 949                         num = get_shared_radio_freqs(wpa_s, params.freqs, num);
 950                         if (num > 0 && num == wpa_s->num_multichan_concurrent) {
 951                                 wpa_dbg(wpa_s, MSG_DEBUG, "Scan only the current operating channels since all channels are already used");
 952                         } else {
 953                                 os_free(params.freqs);
 954                                 params.freqs = NULL;
 955                         }
 956                 }
 957         }
 958 #endif /* CONFIG_P2P */
 959
 960         ret = wpa_supplicant_trigger_scan(wpa_s, scan_params);
 961
 962         if (ret && wpa_s->last_scan_req == MANUAL_SCAN_REQ && params.freqs &&
 963             !wpa_s->manual_scan_freqs) {
 964                 /* Restore manual_scan_freqs for the next attempt */
 965                 wpa_s->manual_scan_freqs = params.freqs;
 966                 params.freqs = NULL;
 967         }
 968
 969         wpabuf_free(extra_ie);
 970         os_free(params.freqs);
 971         os_free(params.filter_ssids);
 972
 973         if (ret) {
 974                 wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate AP scan");
 975                 if (prev_state != wpa_s->wpa_state)
 976                         wpa_supplicant_set_state(wpa_s, prev_state);
 977                 /* Restore scan_req since we will try to scan again */
 978                 wpa_s->scan_req = wpa_s->last_scan_req;
 979                 wpa_supplicant_req_scan(wpa_s, 1, 0);
 980         } else {
 981                 wpa_s->scan_for_connection = 0;
 982         }
 983 }
 984
 985
 986 void wpa_supplicant_update_scan_int(struct wpa_supplicant *wpa_s, int sec)
 987 {
 988         struct os_reltime remaining, new_int;
 989         int cancelled;
 990
 991         cancelled = eloop_cancel_timeout_one(wpa_supplicant_scan, wpa_s, NULL,
 992                                              &remaining);
 993
 994         new_int.sec = sec;
 995         new_int.usec = 0;
 996         if (cancelled && os_reltime_before(&remaining, &new_int)) {
 997                 new_int.sec = remaining.sec;
 998                 new_int.usec = remaining.usec;
 999         }
1000
1001         if (cancelled) {
1002                 eloop_register_timeout(new_int.sec, new_int.usec,
1003                                        wpa_supplicant_scan, wpa_s, NULL);
1004         }
1005         wpa_s->scan_interval = sec;
1006 }
1007
1008
1009 /**
1010  * wpa_supplicant_req_scan - Schedule a scan for neighboring access points
1011  * @wpa_s: Pointer to wpa_supplicant data
1012  * @sec: Number of seconds after which to scan
1013  * @usec: Number of microseconds after which to scan
1014  *
1015  * This function is used to schedule a scan for neighboring access points after
1016  * the specified time.
1017  */
1018 void wpa_supplicant_req_scan(struct wpa_supplicant *wpa_s, int sec, int usec)
1019 {
1020         int res = eloop_deplete_timeout(sec, usec, wpa_supplicant_scan, wpa_s,
1021                                         NULL);
1022         if (res == 1) {
1023                 wpa_dbg(wpa_s, MSG_DEBUG, "Rescheduling scan request: %d.%06d sec",
1024                         sec, usec);
1025         } else if (res == 0) {
1026                 wpa_dbg(wpa_s, MSG_DEBUG, "Ignore new scan request for %d.%06d sec since an earlier request is scheduled to trigger sooner",
1027                         sec, usec);
1028         } else {
1029                 wpa_dbg(wpa_s, MSG_DEBUG, "Setting scan request: %d.%06d sec",
1030                         sec, usec);
1031                 eloop_register_timeout(sec, usec, wpa_supplicant_scan, wpa_s, NULL);
1032         }
1033 }
1034
1035
1036 /**
1037  * wpa_supplicant_delayed_sched_scan - Request a delayed scheduled scan
1038  * @wpa_s: Pointer to wpa_supplicant data
1039  * @sec: Number of seconds after which to scan
1040  * @usec: Number of microseconds after which to scan
1041  * Returns: 0 on success or -1 otherwise
1042  *
1043  * This function is used to schedule periodic scans for neighboring
1044  * access points after the specified time.
1045  */
1046 int wpa_supplicant_delayed_sched_scan(struct wpa_supplicant *wpa_s,
1047                                       int sec, int usec)
1048 {
1049         if (!wpa_s->sched_scan_supported)
1050                 return -1;
1051
1052         eloop_register_timeout(sec, usec,
1053                                wpa_supplicant_delayed_sched_scan_timeout,
1054                                wpa_s, NULL);
1055
1056         return 0;
1057 }
1058
1059
1060 /**
1061  * wpa_supplicant_req_sched_scan - Start a periodic scheduled scan
1062  * @wpa_s: Pointer to wpa_supplicant data
1063  * Returns: 0 is sched_scan was started or -1 otherwise
1064  *
1065  * This function is used to schedule periodic scans for neighboring
1066  * access points repeating the scan continuously.
1067  */
1068 int wpa_supplicant_req_sched_scan(struct wpa_supplicant *wpa_s)
1069 {
1070         struct wpa_driver_scan_params params;
1071         struct wpa_driver_scan_params *scan_params;
1072         enum wpa_states prev_state;
1073         struct wpa_ssid *ssid = NULL;
1074         struct wpabuf *extra_ie = NULL;
1075         int ret;
1076         unsigned int max_sched_scan_ssids;
1077         int wildcard = 0;
1078         int need_ssids;
1079
1080         if (!wpa_s->sched_scan_supported)
1081                 return -1;
1082
1083         if (wpa_s->max_sched_scan_ssids > WPAS_MAX_SCAN_SSIDS)
1084                 max_sched_scan_ssids = WPAS_MAX_SCAN_SSIDS;
1085         else
1086                 max_sched_scan_ssids = wpa_s->max_sched_scan_ssids;
1087         if (max_sched_scan_ssids < 1 || wpa_s->conf->disable_scan_offload)
1088                 return -1;
1089
1090         if (wpa_s->sched_scanning) {
1091                 wpa_dbg(wpa_s, MSG_DEBUG, "Already sched scanning");
1092                 return 0;
1093         }
1094
1095         need_ssids = 0;
1096         for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
1097                 if (!wpas_network_disabled(wpa_s, ssid) && !ssid->scan_ssid) {
1098                         /* Use wildcard SSID to find this network */
1099                         wildcard = 1;
1100                 } else if (!wpas_network_disabled(wpa_s, ssid) &&
1101                            ssid->ssid_len)
1102                         need_ssids++;
1103
1104 #ifdef CONFIG_WPS
1105                 if (!wpas_network_disabled(wpa_s, ssid) &&
1106                     ssid->key_mgmt == WPA_KEY_MGMT_WPS) {
1107                         /*
1108                          * Normal scan is more reliable and faster for WPS
1109                          * operations and since these are for short periods of
1110                          * time, the benefit of trying to use sched_scan would
1111                          * be limited.
1112                          */
1113                         wpa_dbg(wpa_s, MSG_DEBUG, "Use normal scan instead of "
1114                                 "sched_scan for WPS");
1115                         return -1;
1116                 }
1117 #endif /* CONFIG_WPS */
1118         }
1119         if (wildcard)
1120                 need_ssids++;
1121
1122         if (wpa_s->normal_scans < 3 &&
1123             (need_ssids <= wpa_s->max_scan_ssids ||
1124              wpa_s->max_scan_ssids >= (int) max_sched_scan_ssids)) {
1125                 /*
1126                  * When normal scan can speed up operations, use that for the
1127                  * first operations before starting the sched_scan to allow
1128                  * user space sleep more. We do this only if the normal scan
1129                  * has functionality that is suitable for this or if the
1130                  * sched_scan does not have better support for multiple SSIDs.
1131                  */
1132                 wpa_dbg(wpa_s, MSG_DEBUG, "Use normal scan instead of "
1133                         "sched_scan for initial scans (normal_scans=%d)",
1134                         wpa_s->normal_scans);
1135                 return -1;
1136         }
1137
1138         os_memset(&params, 0, sizeof(params));
1139
1140         /* If we can't allocate space for the filters, we just don't filter */
1141         params.filter_ssids = os_zalloc(wpa_s->max_match_sets *
1142                                         sizeof(struct wpa_driver_scan_filter));
1143
1144         prev_state = wpa_s->wpa_state;
1145         if (wpa_s->wpa_state == WPA_DISCONNECTED ||
1146             wpa_s->wpa_state == WPA_INACTIVE)
1147                 wpa_supplicant_set_state(wpa_s, WPA_SCANNING);
1148
1149         if (wpa_s->autoscan_params != NULL) {
1150                 scan_params = wpa_s->autoscan_params;
1151                 goto scan;
1152         }
1153
1154         /* Find the starting point from which to continue scanning */
1155         ssid = wpa_s->conf->ssid;
1156         if (wpa_s->prev_sched_ssid) {
1157                 while (ssid) {
1158                         if (ssid == wpa_s->prev_sched_ssid) {
1159                                 ssid = ssid->next;
1160                                 break;
1161                         }
1162                         ssid = ssid->next;
1163                 }
1164         }
1165
1166         if (!ssid || !wpa_s->prev_sched_ssid) {
1167                 wpa_dbg(wpa_s, MSG_DEBUG, "Beginning of SSID list");
1168                 if (wpa_s->conf->sched_scan_interval)
1169                         wpa_s->sched_scan_interval =
1170                                 wpa_s->conf->sched_scan_interval;
1171                 if (wpa_s->sched_scan_interval == 0)
1172                         wpa_s->sched_scan_interval = 10;
1173                 wpa_s->sched_scan_timeout = max_sched_scan_ssids * 2;
1174                 wpa_s->first_sched_scan = 1;
1175                 ssid = wpa_s->conf->ssid;
1176                 wpa_s->prev_sched_ssid = ssid;
1177         }
1178
1179         if (wildcard) {
1180                 wpa_dbg(wpa_s, MSG_DEBUG, "Add wildcard SSID to sched_scan");
1181                 params.num_ssids++;
1182         }
1183
1184         while (ssid) {
1185                 if (wpas_network_disabled(wpa_s, ssid))
1186                         goto next;
1187
1188                 if (params.num_filter_ssids < wpa_s->max_match_sets &&
1189                     params.filter_ssids && ssid->ssid && ssid->ssid_len) {
1190                         wpa_dbg(wpa_s, MSG_DEBUG, "add to filter ssid: %s",
1191                                 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
1192                         os_memcpy(params.filter_ssids[params.num_filter_ssids].ssid,
1193                                   ssid->ssid, ssid->ssid_len);
1194                         params.filter_ssids[params.num_filter_ssids].ssid_len =
1195                                 ssid->ssid_len;
1196                         params.num_filter_ssids++;
1197                 } else if (params.filter_ssids && ssid->ssid && ssid->ssid_len)
1198                 {
1199                         wpa_dbg(wpa_s, MSG_DEBUG, "Not enough room for SSID "
1200                                 "filter for sched_scan - drop filter");
1201                         os_free(params.filter_ssids);
1202                         params.filter_ssids = NULL;
1203                         params.num_filter_ssids = 0;
1204                 }
1205
1206                 if (ssid->scan_ssid && ssid->ssid && ssid->ssid_len) {
1207                         if (params.num_ssids == max_sched_scan_ssids)
1208                                 break; /* only room for broadcast SSID */
1209                         wpa_dbg(wpa_s, MSG_DEBUG,
1210                                 "add to active scan ssid: %s",
1211                                 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
1212                         params.ssids[params.num_ssids].ssid =
1213                                 ssid->ssid;
1214                         params.ssids[params.num_ssids].ssid_len =
1215                                 ssid->ssid_len;
1216                         params.num_ssids++;
1217                         if (params.num_ssids >= max_sched_scan_ssids) {
1218                                 wpa_s->prev_sched_ssid = ssid;
1219                                 do {
1220                                         ssid = ssid->next;
1221                                 } while (ssid &&
1222                                          (wpas_network_disabled(wpa_s, ssid) ||
1223                                           !ssid->scan_ssid));
1224                                 break;
1225                         }
1226                 }
1227
1228         next:
1229                 wpa_s->prev_sched_ssid = ssid;
1230                 ssid = ssid->next;
1231         }
1232
1233         if (params.num_filter_ssids == 0) {
1234                 os_free(params.filter_ssids);
1235                 params.filter_ssids = NULL;
1236         }
1237
1238         extra_ie = wpa_supplicant_extra_ies(wpa_s);
1239         if (extra_ie) {
1240                 params.extra_ies = wpabuf_head(extra_ie);
1241                 params.extra_ies_len = wpabuf_len(extra_ie);
1242         }
1243
1244         if (wpa_s->conf->filter_rssi)
1245                 params.filter_rssi = wpa_s->conf->filter_rssi;
1246
1247         scan_params = &params;
1248
1249 scan:
1250         if (ssid || !wpa_s->first_sched_scan) {
1251                 wpa_dbg(wpa_s, MSG_DEBUG,
1252                         "Starting sched scan: interval %d timeout %d",
1253                         wpa_s->sched_scan_interval, wpa_s->sched_scan_timeout);
1254         } else {
1255                 wpa_dbg(wpa_s, MSG_DEBUG,
1256                         "Starting sched scan: interval %d (no timeout)",
1257                         wpa_s->sched_scan_interval);
1258         }
1259
1260         wpa_setband_scan_freqs(wpa_s, scan_params);
1261
1262         ret = wpa_supplicant_start_sched_scan(wpa_s, scan_params,
1263                                               wpa_s->sched_scan_interval);
1264         wpabuf_free(extra_ie);
1265         os_free(params.filter_ssids);
1266         if (ret) {
1267                 wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate sched scan");
1268                 if (prev_state != wpa_s->wpa_state)
1269                         wpa_supplicant_set_state(wpa_s, prev_state);
1270                 return ret;
1271         }
1272
1273         /* If we have more SSIDs to scan, add a timeout so we scan them too */
1274         if (ssid || !wpa_s->first_sched_scan) {
1275                 wpa_s->sched_scan_timed_out = 0;
1276                 eloop_register_timeout(wpa_s->sched_scan_timeout, 0,
1277                                        wpa_supplicant_sched_scan_timeout,
1278                                        wpa_s, NULL);
1279                 wpa_s->first_sched_scan = 0;
1280                 wpa_s->sched_scan_timeout /= 2;
1281                 wpa_s->sched_scan_interval *= 2;
1282                 if (wpa_s->sched_scan_timeout < wpa_s->sched_scan_interval) {
1283                         wpa_s->sched_scan_interval = 10;
1284                         wpa_s->sched_scan_timeout = max_sched_scan_ssids * 2;
1285                 }
1286         }
1287
1288         /* If there is no more ssids, start next time from the beginning */
1289         if (!ssid)
1290                 wpa_s->prev_sched_ssid = NULL;
1291
1292         return 0;
1293 }
1294
1295
1296 /**
1297  * wpa_supplicant_cancel_scan - Cancel a scheduled scan request
1298  * @wpa_s: Pointer to wpa_supplicant data
1299  *
1300  * This function is used to cancel a scan request scheduled with
1301  * wpa_supplicant_req_scan().
1302  */
1303 void wpa_supplicant_cancel_scan(struct wpa_supplicant *wpa_s)
1304 {
1305         wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling scan request");
1306         eloop_cancel_timeout(wpa_supplicant_scan, wpa_s, NULL);
1307 }
1308
1309
1310 /**
1311  * wpa_supplicant_cancel_delayed_sched_scan - Stop a delayed scheduled scan
1312  * @wpa_s: Pointer to wpa_supplicant data
1313  *
1314  * This function is used to stop a delayed scheduled scan.
1315  */
1316 void wpa_supplicant_cancel_delayed_sched_scan(struct wpa_supplicant *wpa_s)
1317 {
1318         if (!wpa_s->sched_scan_supported)
1319                 return;
1320
1321         wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling delayed sched scan");
1322         eloop_cancel_timeout(wpa_supplicant_delayed_sched_scan_timeout,
1323                              wpa_s, NULL);
1324 }
1325
1326
1327 /**
1328  * wpa_supplicant_cancel_sched_scan - Stop running scheduled scans
1329  * @wpa_s: Pointer to wpa_supplicant data
1330  *
1331  * This function is used to stop a periodic scheduled scan.
1332  */
1333 void wpa_supplicant_cancel_sched_scan(struct wpa_supplicant *wpa_s)
1334 {
1335         if (!wpa_s->sched_scanning)
1336                 return;
1337
1338         wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling sched scan");
1339         eloop_cancel_timeout(wpa_supplicant_sched_scan_timeout, wpa_s, NULL);
1340         wpa_supplicant_stop_sched_scan(wpa_s);
1341 }
1342
1343
1344 /**
1345  * wpa_supplicant_notify_scanning - Indicate possible scan state change
1346  * @wpa_s: Pointer to wpa_supplicant data
1347  * @scanning: Whether scanning is currently in progress
1348  *
1349  * This function is to generate scanning notifycations. It is called whenever
1350  * there may have been a change in scanning (scan started, completed, stopped).
1351  * wpas_notify_scanning() is called whenever the scanning state changed from the
1352  * previously notified state.
1353  */
1354 void wpa_supplicant_notify_scanning(struct wpa_supplicant *wpa_s,
1355                                     int scanning)
1356 {
1357         if (wpa_s->scanning != scanning) {
1358                 wpa_s->scanning = scanning;
1359                 wpas_notify_scanning(wpa_s);
1360         }
1361 }
1362
1363
1364 static int wpa_scan_get_max_rate(const struct wpa_scan_res *res)
1365 {
1366         int rate = 0;
1367         const u8 *ie;
1368         int i;
1369
1370         ie = wpa_scan_get_ie(res, WLAN_EID_SUPP_RATES);
1371         for (i = 0; ie && i < ie[1]; i++) {
1372                 if ((ie[i + 2] & 0x7f) > rate)
1373                         rate = ie[i + 2] & 0x7f;
1374         }
1375
1376         ie = wpa_scan_get_ie(res, WLAN_EID_EXT_SUPP_RATES);
1377         for (i = 0; ie && i < ie[1]; i++) {
1378                 if ((ie[i + 2] & 0x7f) > rate)
1379                         rate = ie[i + 2] & 0x7f;
1380         }
1381
1382         return rate;
1383 }
1384
1385
1386 /**
1387  * wpa_scan_get_ie - Fetch a specified information element from a scan result
1388  * @res: Scan result entry
1389  * @ie: Information element identitifier (WLAN_EID_*)
1390  * Returns: Pointer to the information element (id field) or %NULL if not found
1391  *
1392  * This function returns the first matching information element in the scan
1393  * result.
1394  */
1395 const u8 * wpa_scan_get_ie(const struct wpa_scan_res *res, u8 ie)
1396 {
1397         const u8 *end, *pos;
1398
1399         pos = (const u8 *) (res + 1);
1400         end = pos + res->ie_len;
1401
1402         while (pos + 1 < end) {
1403                 if (pos + 2 + pos[1] > end)
1404                         break;
1405                 if (pos[0] == ie)
1406                         return pos;
1407                 pos += 2 + pos[1];
1408         }
1409
1410         return NULL;
1411 }
1412
1413
1414 /**
1415  * wpa_scan_get_vendor_ie - Fetch vendor information element from a scan result
1416  * @res: Scan result entry
1417  * @vendor_type: Vendor type (four octets starting the IE payload)
1418  * Returns: Pointer to the information element (id field) or %NULL if not found
1419  *
1420  * This function returns the first matching information element in the scan
1421  * result.
1422  */
1423 const u8 * wpa_scan_get_vendor_ie(const struct wpa_scan_res *res,
1424                                   u32 vendor_type)
1425 {
1426         const u8 *end, *pos;
1427
1428         pos = (const u8 *) (res + 1);
1429         end = pos + res->ie_len;
1430
1431         while (pos + 1 < end) {
1432                 if (pos + 2 + pos[1] > end)
1433                         break;
1434                 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1435                     vendor_type == WPA_GET_BE32(&pos[2]))
1436                         return pos;
1437                 pos += 2 + pos[1];
1438         }
1439
1440         return NULL;
1441 }
1442
1443
1444 /**
1445  * wpa_scan_get_vendor_ie_beacon - Fetch vendor information from a scan result
1446  * @res: Scan result entry
1447  * @vendor_type: Vendor type (four octets starting the IE payload)
1448  * Returns: Pointer to the information element (id field) or %NULL if not found
1449  *
1450  * This function returns the first matching information element in the scan
1451  * result.
1452  *
1453  * This function is like wpa_scan_get_vendor_ie(), but uses IE buffer only
1454  * from Beacon frames instead of either Beacon or Probe Response frames.
1455  */
1456 const u8 * wpa_scan_get_vendor_ie_beacon(const struct wpa_scan_res *res,
1457                                          u32 vendor_type)
1458 {
1459         const u8 *end, *pos;
1460
1461         if (res->beacon_ie_len == 0)
1462                 return NULL;
1463
1464         pos = (const u8 *) (res + 1);
1465         pos += res->ie_len;
1466         end = pos + res->beacon_ie_len;
1467
1468         while (pos + 1 < end) {
1469                 if (pos + 2 + pos[1] > end)
1470                         break;
1471                 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1472                     vendor_type == WPA_GET_BE32(&pos[2]))
1473                         return pos;
1474                 pos += 2 + pos[1];
1475         }
1476
1477         return NULL;
1478 }
1479
1480
1481 /**
1482  * wpa_scan_get_vendor_ie_multi - Fetch vendor IE data from a scan result
1483  * @res: Scan result entry
1484  * @vendor_type: Vendor type (four octets starting the IE payload)
1485  * Returns: Pointer to the information element payload or %NULL if not found
1486  *
1487  * This function returns concatenated payload of possibly fragmented vendor
1488  * specific information elements in the scan result. The caller is responsible
1489  * for freeing the returned buffer.
1490  */
1491 struct wpabuf * wpa_scan_get_vendor_ie_multi(const struct wpa_scan_res *res,
1492                                              u32 vendor_type)
1493 {
1494         struct wpabuf *buf;
1495         const u8 *end, *pos;
1496
1497         buf = wpabuf_alloc(res->ie_len);
1498         if (buf == NULL)
1499                 return NULL;
1500
1501         pos = (const u8 *) (res + 1);
1502         end = pos + res->ie_len;
1503
1504         while (pos + 1 < end) {
1505                 if (pos + 2 + pos[1] > end)
1506                         break;
1507                 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1508                     vendor_type == WPA_GET_BE32(&pos[2]))
1509                         wpabuf_put_data(buf, pos + 2 + 4, pos[1] - 4);
1510                 pos += 2 + pos[1];
1511         }
1512
1513         if (wpabuf_len(buf) == 0) {
1514                 wpabuf_free(buf);
1515                 buf = NULL;
1516         }
1517
1518         return buf;
1519 }
1520
1521
1522 /*
1523  * Channels with a great SNR can operate at full rate. What is a great SNR?
1524  * This doc https://supportforums.cisco.com/docs/DOC-12954 says, "the general
1525  * rule of thumb is that any SNR above 20 is good." This one
1526  * http://www.cisco.com/en/US/tech/tk722/tk809/technologies_q_and_a_item09186a00805e9a96.shtml#qa23
1527  * recommends 25 as a minimum SNR for 54 Mbps data rate. 30 is chosen here as a
1528  * conservative value.
1529  */
1530 #define GREAT_SNR 30
1531
1532 /* Compare function for sorting scan results. Return >0 if @b is considered
1533  * better. */
1534 static int wpa_scan_result_compar(const void *a, const void *b)
1535 {
1536 #define IS_5GHZ(n) (n > 4000)
1537 #define MIN(a,b) a < b ? a : b
1538         struct wpa_scan_res **_wa = (void *) a;
1539         struct wpa_scan_res **_wb = (void *) b;
1540         struct wpa_scan_res *wa = *_wa;
1541         struct wpa_scan_res *wb = *_wb;
1542         int wpa_a, wpa_b, maxrate_a, maxrate_b;
1543         int snr_a, snr_b;
1544
1545         /* WPA/WPA2 support preferred */
1546         wpa_a = wpa_scan_get_vendor_ie(wa, WPA_IE_VENDOR_TYPE) != NULL ||
1547                 wpa_scan_get_ie(wa, WLAN_EID_RSN) != NULL;
1548         wpa_b = wpa_scan_get_vendor_ie(wb, WPA_IE_VENDOR_TYPE) != NULL ||
1549                 wpa_scan_get_ie(wb, WLAN_EID_RSN) != NULL;
1550
1551         if (wpa_b && !wpa_a)
1552                 return 1;
1553         if (!wpa_b && wpa_a)
1554                 return -1;
1555
1556         /* privacy support preferred */
1557         if ((wa->caps & IEEE80211_CAP_PRIVACY) == 0 &&
1558             (wb->caps & IEEE80211_CAP_PRIVACY))
1559                 return 1;
1560         if ((wa->caps & IEEE80211_CAP_PRIVACY) &&
1561             (wb->caps & IEEE80211_CAP_PRIVACY) == 0)
1562                 return -1;
1563
1564         if ((wa->flags & wb->flags & WPA_SCAN_LEVEL_DBM) &&
1565             !((wa->flags | wb->flags) & WPA_SCAN_NOISE_INVALID)) {
1566                 snr_a = MIN(wa->level - wa->noise, GREAT_SNR);
1567                 snr_b = MIN(wb->level - wb->noise, GREAT_SNR);
1568         } else {
1569                 /* Not suitable information to calculate SNR, so use level */
1570                 snr_a = wa->level;
1571                 snr_b = wb->level;
1572         }
1573
1574         /* best/max rate preferred if SNR close enough */
1575         if ((snr_a && snr_b && abs(snr_b - snr_a) < 5) ||
1576             (wa->qual && wb->qual && abs(wb->qual - wa->qual) < 10)) {
1577                 maxrate_a = wpa_scan_get_max_rate(wa);
1578                 maxrate_b = wpa_scan_get_max_rate(wb);
1579                 if (maxrate_a != maxrate_b)
1580                         return maxrate_b - maxrate_a;
1581                 if (IS_5GHZ(wa->freq) ^ IS_5GHZ(wb->freq))
1582                         return IS_5GHZ(wa->freq) ? -1 : 1;
1583         }
1584
1585         /* use freq for channel preference */
1586
1587         /* all things being equal, use SNR; if SNRs are
1588          * identical, use quality values since some drivers may only report
1589          * that value and leave the signal level zero */
1590         if (snr_b == snr_a)
1591                 return wb->qual - wa->qual;
1592         return snr_b - snr_a;
1593 #undef MIN
1594 #undef IS_5GHZ
1595 }
1596
1597
1598 #ifdef CONFIG_WPS
1599 /* Compare function for sorting scan results when searching a WPS AP for
1600  * provisioning. Return >0 if @b is considered better. */
1601 static int wpa_scan_result_wps_compar(const void *a, const void *b)
1602 {
1603         struct wpa_scan_res **_wa = (void *) a;
1604         struct wpa_scan_res **_wb = (void *) b;
1605         struct wpa_scan_res *wa = *_wa;
1606         struct wpa_scan_res *wb = *_wb;
1607         int uses_wps_a, uses_wps_b;
1608         struct wpabuf *wps_a, *wps_b;
1609         int res;
1610
1611         /* Optimization - check WPS IE existence before allocated memory and
1612          * doing full reassembly. */
1613         uses_wps_a = wpa_scan_get_vendor_ie(wa, WPS_IE_VENDOR_TYPE) != NULL;
1614         uses_wps_b = wpa_scan_get_vendor_ie(wb, WPS_IE_VENDOR_TYPE) != NULL;
1615         if (uses_wps_a && !uses_wps_b)
1616                 return -1;
1617         if (!uses_wps_a && uses_wps_b)
1618                 return 1;
1619
1620         if (uses_wps_a && uses_wps_b) {
1621                 wps_a = wpa_scan_get_vendor_ie_multi(wa, WPS_IE_VENDOR_TYPE);
1622                 wps_b = wpa_scan_get_vendor_ie_multi(wb, WPS_IE_VENDOR_TYPE);
1623                 res = wps_ap_priority_compar(wps_a, wps_b);
1624                 wpabuf_free(wps_a);
1625                 wpabuf_free(wps_b);
1626                 if (res)
1627                         return res;
1628         }
1629
1630         /*
1631          * Do not use current AP security policy as a sorting criteria during
1632          * WPS provisioning step since the AP may get reconfigured at the
1633          * completion of provisioning.
1634          */
1635
1636         /* all things being equal, use signal level; if signal levels are
1637          * identical, use quality values since some drivers may only report
1638          * that value and leave the signal level zero */
1639         if (wb->level == wa->level)
1640                 return wb->qual - wa->qual;
1641         return wb->level - wa->level;
1642 }
1643 #endif /* CONFIG_WPS */
1644
1645
1646 static void dump_scan_res(struct wpa_scan_results *scan_res)
1647 {
1648 #ifndef CONFIG_NO_STDOUT_DEBUG
1649         size_t i;
1650
1651         if (scan_res->res == NULL || scan_res->num == 0)
1652                 return;
1653
1654         wpa_printf(MSG_EXCESSIVE, "Sorted scan results");
1655
1656         for (i = 0; i < scan_res->num; i++) {
1657                 struct wpa_scan_res *r = scan_res->res[i];
1658                 u8 *pos;
1659                 if ((r->flags & (WPA_SCAN_LEVEL_DBM | WPA_SCAN_NOISE_INVALID))
1660                     == WPA_SCAN_LEVEL_DBM) {
1661                         int snr = r->level - r->noise;
1662                         wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d "
1663                                    "noise=%d level=%d snr=%d%s flags=0x%x "
1664                                    "age=%u",
1665                                    MAC2STR(r->bssid), r->freq, r->qual,
1666                                    r->noise, r->level, snr,
1667                                    snr >= GREAT_SNR ? "*" : "", r->flags,
1668                                    r->age);
1669                 } else {
1670                         wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d "
1671                                    "noise=%d level=%d flags=0x%x age=%u",
1672                                    MAC2STR(r->bssid), r->freq, r->qual,
1673                                    r->noise, r->level, r->flags, r->age);
1674                 }
1675                 pos = (u8 *) (r + 1);
1676                 if (r->ie_len)
1677                         wpa_hexdump(MSG_EXCESSIVE, "IEs", pos, r->ie_len);
1678                 pos += r->ie_len;
1679                 if (r->beacon_ie_len)
1680                         wpa_hexdump(MSG_EXCESSIVE, "Beacon IEs",
1681                                     pos, r->beacon_ie_len);
1682         }
1683 #endif /* CONFIG_NO_STDOUT_DEBUG */
1684 }
1685
1686
1687 /**
1688  * wpa_supplicant_filter_bssid_match - Is the specified BSSID allowed
1689  * @wpa_s: Pointer to wpa_supplicant data
1690  * @bssid: BSSID to check
1691  * Returns: 0 if the BSSID is filtered or 1 if not
1692  *
1693  * This function is used to filter out specific BSSIDs from scan reslts mainly
1694  * for testing purposes (SET bssid_filter ctrl_iface command).
1695  */
1696 int wpa_supplicant_filter_bssid_match(struct wpa_supplicant *wpa_s,
1697                                       const u8 *bssid)
1698 {
1699         size_t i;
1700
1701         if (wpa_s->bssid_filter == NULL)
1702                 return 1;
1703
1704         for (i = 0; i < wpa_s->bssid_filter_count; i++) {
1705                 if (os_memcmp(wpa_s->bssid_filter + i * ETH_ALEN, bssid,
1706                               ETH_ALEN) == 0)
1707                         return 1;
1708         }
1709
1710         return 0;
1711 }
1712
1713
1714 static void filter_scan_res(struct wpa_supplicant *wpa_s,
1715                             struct wpa_scan_results *res)
1716 {
1717         size_t i, j;
1718
1719         if (wpa_s->bssid_filter == NULL)
1720                 return;
1721
1722         for (i = 0, j = 0; i < res->num; i++) {
1723                 if (wpa_supplicant_filter_bssid_match(wpa_s,
1724                                                       res->res[i]->bssid)) {
1725                         res->res[j++] = res->res[i];
1726                 } else {
1727                         os_free(res->res[i]);
1728                         res->res[i] = NULL;
1729                 }
1730         }
1731
1732         if (res->num != j) {
1733                 wpa_printf(MSG_DEBUG, "Filtered out %d scan results",
1734                            (int) (res->num - j));
1735                 res->num = j;
1736         }
1737 }
1738
1739
1740 /**
1741  * wpa_supplicant_get_scan_results - Get scan results
1742  * @wpa_s: Pointer to wpa_supplicant data
1743  * @info: Information about what was scanned or %NULL if not available
1744  * @new_scan: Whether a new scan was performed
1745  * Returns: Scan results, %NULL on failure
1746  *
1747  * This function request the current scan results from the driver and updates
1748  * the local BSS list wpa_s->bss. The caller is responsible for freeing the
1749  * results with wpa_scan_results_free().
1750  */
1751 struct wpa_scan_results *
1752 wpa_supplicant_get_scan_results(struct wpa_supplicant *wpa_s,
1753                                 struct scan_info *info, int new_scan)
1754 {
1755         struct wpa_scan_results *scan_res;
1756         size_t i;
1757         int (*compar)(const void *, const void *) = wpa_scan_result_compar;
1758
1759         scan_res = wpa_drv_get_scan_results2(wpa_s);
1760         if (scan_res == NULL) {
1761                 wpa_dbg(wpa_s, MSG_DEBUG, "Failed to get scan results");
1762                 return NULL;
1763         }
1764         if (scan_res->fetch_time.sec == 0) {
1765                 /*
1766                  * Make sure we have a valid timestamp if the driver wrapper
1767                  * does not set this.
1768                  */
1769                 os_get_reltime(&scan_res->fetch_time);
1770         }
1771         filter_scan_res(wpa_s, scan_res);
1772
1773 #ifdef CONFIG_WPS
1774         if (wpas_wps_searching(wpa_s)) {
1775                 wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Order scan results with WPS "
1776                         "provisioning rules");
1777                 compar = wpa_scan_result_wps_compar;
1778         }
1779 #endif /* CONFIG_WPS */
1780
1781         qsort(scan_res->res, scan_res->num, sizeof(struct wpa_scan_res *),
1782               compar);
1783         dump_scan_res(scan_res);
1784
1785         wpa_bss_update_start(wpa_s);
1786         for (i = 0; i < scan_res->num; i++)
1787                 wpa_bss_update_scan_res(wpa_s, scan_res->res[i],
1788                                         &scan_res->fetch_time);
1789         wpa_bss_update_end(wpa_s, info, new_scan);
1790
1791         return scan_res;
1792 }
1793
1794
1795 /**
1796  * wpa_supplicant_update_scan_results - Update scan results from the driver
1797  * @wpa_s: Pointer to wpa_supplicant data
1798  * Returns: 0 on success, -1 on failure
1799  *
1800  * This function updates the BSS table within wpa_supplicant based on the
1801  * currently available scan results from the driver without requesting a new
1802  * scan. This is used in cases where the driver indicates an association
1803  * (including roaming within ESS) and wpa_supplicant does not yet have the
1804  * needed information to complete the connection (e.g., to perform validation
1805  * steps in 4-way handshake).
1806  */
1807 int wpa_supplicant_update_scan_results(struct wpa_supplicant *wpa_s)
1808 {
1809         struct wpa_scan_results *scan_res;
1810         scan_res = wpa_supplicant_get_scan_results(wpa_s, NULL, 0);
1811         if (scan_res == NULL)
1812                 return -1;
1813         wpa_scan_results_free(scan_res);
1814
1815         return 0;
1816 }
1817
1818
1819 /**
1820  * scan_only_handler - Reports scan results
1821  */
1822 void scan_only_handler(struct wpa_supplicant *wpa_s,
1823                        struct wpa_scan_results *scan_res)
1824 {
1825         wpa_dbg(wpa_s, MSG_DEBUG, "Scan-only results received");
1826         if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
1827             wpa_s->manual_scan_use_id && wpa_s->own_scan_running) {
1828                 wpa_msg_ctrl(wpa_s, MSG_INFO, WPA_EVENT_SCAN_RESULTS "id=%u",
1829                              wpa_s->manual_scan_id);
1830                 wpa_s->manual_scan_use_id = 0;
1831         } else {
1832                 wpa_msg_ctrl(wpa_s, MSG_INFO, WPA_EVENT_SCAN_RESULTS);
1833         }
1834         wpas_notify_scan_results(wpa_s);
1835         wpas_notify_scan_done(wpa_s, 1);
1836         if (wpa_s->scan_work) {
1837                 struct wpa_radio_work *work = wpa_s->scan_work;
1838                 wpa_s->scan_work = NULL;
1839                 radio_work_done(work);
1840         }
1841 }
1842
1843
1844 int wpas_scan_scheduled(struct wpa_supplicant *wpa_s)
1845 {
1846         return eloop_is_timeout_registered(wpa_supplicant_scan, wpa_s, NULL);
1847 }
1848
1849
1850 struct wpa_driver_scan_params *
1851 wpa_scan_clone_params(const struct wpa_driver_scan_params *src)
1852 {
1853         struct wpa_driver_scan_params *params;
1854         size_t i;
1855         u8 *n;
1856
1857         params = os_zalloc(sizeof(*params));
1858         if (params == NULL)
1859                 return NULL;
1860
1861         for (i = 0; i < src->num_ssids; i++) {
1862                 if (src->ssids[i].ssid) {
1863                         n = os_malloc(src->ssids[i].ssid_len);
1864                         if (n == NULL)
1865                                 goto failed;
1866                         os_memcpy(n, src->ssids[i].ssid,
1867                                   src->ssids[i].ssid_len);
1868                         params->ssids[i].ssid = n;
1869                         params->ssids[i].ssid_len = src->ssids[i].ssid_len;
1870                 }
1871         }
1872         params->num_ssids = src->num_ssids;
1873
1874         if (src->extra_ies) {
1875                 n = os_malloc(src->extra_ies_len);
1876                 if (n == NULL)
1877                         goto failed;
1878                 os_memcpy(n, src->extra_ies, src->extra_ies_len);
1879                 params->extra_ies = n;
1880                 params->extra_ies_len = src->extra_ies_len;
1881         }
1882
1883         if (src->freqs) {
1884                 int len = int_array_len(src->freqs);
1885                 params->freqs = os_malloc((len + 1) * sizeof(int));
1886                 if (params->freqs == NULL)
1887                         goto failed;
1888                 os_memcpy(params->freqs, src->freqs, (len + 1) * sizeof(int));
1889         }
1890
1891         if (src->filter_ssids) {
1892                 params->filter_ssids = os_malloc(sizeof(*params->filter_ssids) *
1893                                                  src->num_filter_ssids);
1894                 if (params->filter_ssids == NULL)
1895                         goto failed;
1896                 os_memcpy(params->filter_ssids, src->filter_ssids,
1897                           sizeof(*params->filter_ssids) *
1898                           src->num_filter_ssids);
1899                 params->num_filter_ssids = src->num_filter_ssids;
1900         }
1901
1902         params->filter_rssi = src->filter_rssi;
1903         params->p2p_probe = src->p2p_probe;
1904         params->only_new_results = src->only_new_results;
1905         params->low_priority = src->low_priority;
1906
1907         return params;
1908
1909 failed:
1910         wpa_scan_free_params(params);
1911         return NULL;
1912 }
1913
1914
1915 void wpa_scan_free_params(struct wpa_driver_scan_params *params)
1916 {
1917         size_t i;
1918
1919         if (params == NULL)
1920                 return;
1921
1922         for (i = 0; i < params->num_ssids; i++)
1923                 os_free((u8 *) params->ssids[i].ssid);
1924         os_free((u8 *) params->extra_ies);
1925         os_free(params->freqs);
1926         os_free(params->filter_ssids);
1927         os_free(params);
1928 }
1929
1930
1931 int wpas_start_pno(struct wpa_supplicant *wpa_s)
1932 {
1933         int ret, interval;
1934         size_t i, num_ssid, num_match_ssid;
1935         struct wpa_ssid *ssid;
1936         struct wpa_driver_scan_params params;
1937
1938         if (!wpa_s->sched_scan_supported)
1939                 return -1;
1940
1941         if (wpa_s->pno || wpa_s->pno_sched_pending)
1942                 return 0;
1943
1944         if ((wpa_s->wpa_state > WPA_SCANNING) &&
1945             (wpa_s->wpa_state <= WPA_COMPLETED)) {
1946                 wpa_printf(MSG_ERROR, "PNO: In assoc process");
1947                 return -EAGAIN;
1948         }
1949
1950         if (wpa_s->wpa_state == WPA_SCANNING) {
1951                 wpa_supplicant_cancel_scan(wpa_s);
1952                 if (wpa_s->sched_scanning) {
1953                         wpa_printf(MSG_DEBUG, "Schedule PNO on completion of "
1954                                    "ongoing sched scan");
1955                         wpa_supplicant_cancel_sched_scan(wpa_s);
1956                         wpa_s->pno_sched_pending = 1;
1957                         return 0;
1958                 }
1959         }
1960
1961         os_memset(&params, 0, sizeof(params));
1962
1963         num_ssid = num_match_ssid = 0;
1964         ssid = wpa_s->conf->ssid;
1965         while (ssid) {
1966                 if (!wpas_network_disabled(wpa_s, ssid)) {
1967                         num_match_ssid++;
1968                         if (ssid->scan_ssid)
1969                                 num_ssid++;
1970                 }
1971                 ssid = ssid->next;
1972         }
1973
1974         if (num_match_ssid == 0) {
1975                 wpa_printf(MSG_DEBUG, "PNO: No configured SSIDs");
1976                 return -1;
1977         }
1978
1979         if (num_match_ssid > num_ssid) {
1980                 params.num_ssids++; /* wildcard */
1981                 num_ssid++;
1982         }
1983
1984         if (num_ssid > WPAS_MAX_SCAN_SSIDS) {
1985                 wpa_printf(MSG_DEBUG, "PNO: Use only the first %u SSIDs from "
1986                            "%u", WPAS_MAX_SCAN_SSIDS, (unsigned int) num_ssid);
1987                 num_ssid = WPAS_MAX_SCAN_SSIDS;
1988         }
1989
1990         if (num_match_ssid > wpa_s->max_match_sets) {
1991                 num_match_ssid = wpa_s->max_match_sets;
1992                 wpa_dbg(wpa_s, MSG_DEBUG, "PNO: Too many SSIDs to match");
1993         }
1994         params.filter_ssids = os_calloc(num_match_ssid,
1995                                         sizeof(struct wpa_driver_scan_filter));
1996         if (params.filter_ssids == NULL)
1997                 return -1;
1998         i = 0;
1999         ssid = wpa_s->conf->ssid;
2000         while (ssid) {
2001                 if (!wpas_network_disabled(wpa_s, ssid)) {
2002                         if (ssid->scan_ssid && params.num_ssids < num_ssid) {
2003                                 params.ssids[params.num_ssids].ssid =
2004                                         ssid->ssid;
2005                                 params.ssids[params.num_ssids].ssid_len =
2006                                          ssid->ssid_len;
2007                                 params.num_ssids++;
2008                         }
2009                         os_memcpy(params.filter_ssids[i].ssid, ssid->ssid,
2010                                   ssid->ssid_len);
2011                         params.filter_ssids[i].ssid_len = ssid->ssid_len;
2012                         params.num_filter_ssids++;
2013                         i++;
2014                         if (i == num_match_ssid)
2015                                 break;
2016                 }
2017                 ssid = ssid->next;
2018         }
2019
2020         if (wpa_s->conf->filter_rssi)
2021                 params.filter_rssi = wpa_s->conf->filter_rssi;
2022
2023         interval = wpa_s->conf->sched_scan_interval ?
2024                 wpa_s->conf->sched_scan_interval : 10;
2025
2026         if (params.freqs == NULL && wpa_s->manual_sched_scan_freqs) {
2027                 wpa_dbg(wpa_s, MSG_DEBUG, "Limit sched scan to specified channels");
2028                 params.freqs = wpa_s->manual_sched_scan_freqs;
2029         }
2030
2031         ret = wpa_supplicant_start_sched_scan(wpa_s, &params, interval);
2032         os_free(params.filter_ssids);
2033         if (ret == 0)
2034                 wpa_s->pno = 1;
2035         else
2036                 wpa_msg(wpa_s, MSG_ERROR, "Failed to schedule PNO");
2037         return ret;
2038 }
2039
2040
2041 int wpas_stop_pno(struct wpa_supplicant *wpa_s)
2042 {
2043         int ret = 0;
2044
2045         if (!wpa_s->pno)
2046                 return 0;
2047
2048         ret = wpa_supplicant_stop_sched_scan(wpa_s);
2049
2050         wpa_s->pno = 0;
2051         wpa_s->pno_sched_pending = 0;
2052
2053         if (wpa_s->wpa_state == WPA_SCANNING)
2054                 wpa_supplicant_req_scan(wpa_s, 0, 0);
2055
2056         return ret;
2057 }