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         /* See if user specified frequencies. If so, scan only those. */
1248         if (wpa_s->conf->freq_list && !params.freqs) {
1249                 wpa_dbg(wpa_s, MSG_DEBUG,
1250                         "Optimize scan based on conf->freq_list");
1251                 int_array_concat(&params.freqs, wpa_s->conf->freq_list);
1252         }
1253
1254         scan_params = &params;
1255
1256 scan:
1257         if (ssid || !wpa_s->first_sched_scan) {
1258                 wpa_dbg(wpa_s, MSG_DEBUG,
1259                         "Starting sched scan: interval %d timeout %d",
1260                         wpa_s->sched_scan_interval, wpa_s->sched_scan_timeout);
1261         } else {
1262                 wpa_dbg(wpa_s, MSG_DEBUG,
1263                         "Starting sched scan: interval %d (no timeout)",
1264                         wpa_s->sched_scan_interval);
1265         }
1266
1267         wpa_setband_scan_freqs(wpa_s, scan_params);
1268
1269         ret = wpa_supplicant_start_sched_scan(wpa_s, scan_params,
1270                                               wpa_s->sched_scan_interval);
1271         wpabuf_free(extra_ie);
1272         os_free(params.filter_ssids);
1273         if (ret) {
1274                 wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate sched scan");
1275                 if (prev_state != wpa_s->wpa_state)
1276                         wpa_supplicant_set_state(wpa_s, prev_state);
1277                 return ret;
1278         }
1279
1280         /* If we have more SSIDs to scan, add a timeout so we scan them too */
1281         if (ssid || !wpa_s->first_sched_scan) {
1282                 wpa_s->sched_scan_timed_out = 0;
1283                 eloop_register_timeout(wpa_s->sched_scan_timeout, 0,
1284                                        wpa_supplicant_sched_scan_timeout,
1285                                        wpa_s, NULL);
1286                 wpa_s->first_sched_scan = 0;
1287                 wpa_s->sched_scan_timeout /= 2;
1288                 wpa_s->sched_scan_interval *= 2;
1289                 if (wpa_s->sched_scan_timeout < wpa_s->sched_scan_interval) {
1290                         wpa_s->sched_scan_interval = 10;
1291                         wpa_s->sched_scan_timeout = max_sched_scan_ssids * 2;
1292                 }
1293         }
1294
1295         /* If there is no more ssids, start next time from the beginning */
1296         if (!ssid)
1297                 wpa_s->prev_sched_ssid = NULL;
1298
1299         return 0;
1300 }
1301
1302
1303 /**
1304  * wpa_supplicant_cancel_scan - Cancel a scheduled scan request
1305  * @wpa_s: Pointer to wpa_supplicant data
1306  *
1307  * This function is used to cancel a scan request scheduled with
1308  * wpa_supplicant_req_scan().
1309  */
1310 void wpa_supplicant_cancel_scan(struct wpa_supplicant *wpa_s)
1311 {
1312         wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling scan request");
1313         eloop_cancel_timeout(wpa_supplicant_scan, wpa_s, NULL);
1314 }
1315
1316
1317 /**
1318  * wpa_supplicant_cancel_delayed_sched_scan - Stop a delayed scheduled scan
1319  * @wpa_s: Pointer to wpa_supplicant data
1320  *
1321  * This function is used to stop a delayed scheduled scan.
1322  */
1323 void wpa_supplicant_cancel_delayed_sched_scan(struct wpa_supplicant *wpa_s)
1324 {
1325         if (!wpa_s->sched_scan_supported)
1326                 return;
1327
1328         wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling delayed sched scan");
1329         eloop_cancel_timeout(wpa_supplicant_delayed_sched_scan_timeout,
1330                              wpa_s, NULL);
1331 }
1332
1333
1334 /**
1335  * wpa_supplicant_cancel_sched_scan - Stop running scheduled scans
1336  * @wpa_s: Pointer to wpa_supplicant data
1337  *
1338  * This function is used to stop a periodic scheduled scan.
1339  */
1340 void wpa_supplicant_cancel_sched_scan(struct wpa_supplicant *wpa_s)
1341 {
1342         if (!wpa_s->sched_scanning)
1343                 return;
1344
1345         wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling sched scan");
1346         eloop_cancel_timeout(wpa_supplicant_sched_scan_timeout, wpa_s, NULL);
1347         wpa_supplicant_stop_sched_scan(wpa_s);
1348 }
1349
1350
1351 /**
1352  * wpa_supplicant_notify_scanning - Indicate possible scan state change
1353  * @wpa_s: Pointer to wpa_supplicant data
1354  * @scanning: Whether scanning is currently in progress
1355  *
1356  * This function is to generate scanning notifycations. It is called whenever
1357  * there may have been a change in scanning (scan started, completed, stopped).
1358  * wpas_notify_scanning() is called whenever the scanning state changed from the
1359  * previously notified state.
1360  */
1361 void wpa_supplicant_notify_scanning(struct wpa_supplicant *wpa_s,
1362                                     int scanning)
1363 {
1364         if (wpa_s->scanning != scanning) {
1365                 wpa_s->scanning = scanning;
1366                 wpas_notify_scanning(wpa_s);
1367         }
1368 }
1369
1370
1371 static int wpa_scan_get_max_rate(const struct wpa_scan_res *res)
1372 {
1373         int rate = 0;
1374         const u8 *ie;
1375         int i;
1376
1377         ie = wpa_scan_get_ie(res, WLAN_EID_SUPP_RATES);
1378         for (i = 0; ie && i < ie[1]; i++) {
1379                 if ((ie[i + 2] & 0x7f) > rate)
1380                         rate = ie[i + 2] & 0x7f;
1381         }
1382
1383         ie = wpa_scan_get_ie(res, WLAN_EID_EXT_SUPP_RATES);
1384         for (i = 0; ie && i < ie[1]; i++) {
1385                 if ((ie[i + 2] & 0x7f) > rate)
1386                         rate = ie[i + 2] & 0x7f;
1387         }
1388
1389         return rate;
1390 }
1391
1392
1393 /**
1394  * wpa_scan_get_ie - Fetch a specified information element from a scan result
1395  * @res: Scan result entry
1396  * @ie: Information element identitifier (WLAN_EID_*)
1397  * Returns: Pointer to the information element (id field) or %NULL if not found
1398  *
1399  * This function returns the first matching information element in the scan
1400  * result.
1401  */
1402 const u8 * wpa_scan_get_ie(const struct wpa_scan_res *res, u8 ie)
1403 {
1404         const u8 *end, *pos;
1405
1406         pos = (const u8 *) (res + 1);
1407         end = pos + res->ie_len;
1408
1409         while (pos + 1 < end) {
1410                 if (pos + 2 + pos[1] > end)
1411                         break;
1412                 if (pos[0] == ie)
1413                         return pos;
1414                 pos += 2 + pos[1];
1415         }
1416
1417         return NULL;
1418 }
1419
1420
1421 /**
1422  * wpa_scan_get_vendor_ie - Fetch vendor information element from a scan result
1423  * @res: Scan result entry
1424  * @vendor_type: Vendor type (four octets starting the IE payload)
1425  * Returns: Pointer to the information element (id field) or %NULL if not found
1426  *
1427  * This function returns the first matching information element in the scan
1428  * result.
1429  */
1430 const u8 * wpa_scan_get_vendor_ie(const struct wpa_scan_res *res,
1431                                   u32 vendor_type)
1432 {
1433         const u8 *end, *pos;
1434
1435         pos = (const u8 *) (res + 1);
1436         end = pos + res->ie_len;
1437
1438         while (pos + 1 < end) {
1439                 if (pos + 2 + pos[1] > end)
1440                         break;
1441                 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1442                     vendor_type == WPA_GET_BE32(&pos[2]))
1443                         return pos;
1444                 pos += 2 + pos[1];
1445         }
1446
1447         return NULL;
1448 }
1449
1450
1451 /**
1452  * wpa_scan_get_vendor_ie_beacon - Fetch vendor information from a scan result
1453  * @res: Scan result entry
1454  * @vendor_type: Vendor type (four octets starting the IE payload)
1455  * Returns: Pointer to the information element (id field) or %NULL if not found
1456  *
1457  * This function returns the first matching information element in the scan
1458  * result.
1459  *
1460  * This function is like wpa_scan_get_vendor_ie(), but uses IE buffer only
1461  * from Beacon frames instead of either Beacon or Probe Response frames.
1462  */
1463 const u8 * wpa_scan_get_vendor_ie_beacon(const struct wpa_scan_res *res,
1464                                          u32 vendor_type)
1465 {
1466         const u8 *end, *pos;
1467
1468         if (res->beacon_ie_len == 0)
1469                 return NULL;
1470
1471         pos = (const u8 *) (res + 1);
1472         pos += res->ie_len;
1473         end = pos + res->beacon_ie_len;
1474
1475         while (pos + 1 < end) {
1476                 if (pos + 2 + pos[1] > end)
1477                         break;
1478                 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1479                     vendor_type == WPA_GET_BE32(&pos[2]))
1480                         return pos;
1481                 pos += 2 + pos[1];
1482         }
1483
1484         return NULL;
1485 }
1486
1487
1488 /**
1489  * wpa_scan_get_vendor_ie_multi - Fetch vendor IE data from a scan result
1490  * @res: Scan result entry
1491  * @vendor_type: Vendor type (four octets starting the IE payload)
1492  * Returns: Pointer to the information element payload or %NULL if not found
1493  *
1494  * This function returns concatenated payload of possibly fragmented vendor
1495  * specific information elements in the scan result. The caller is responsible
1496  * for freeing the returned buffer.
1497  */
1498 struct wpabuf * wpa_scan_get_vendor_ie_multi(const struct wpa_scan_res *res,
1499                                              u32 vendor_type)
1500 {
1501         struct wpabuf *buf;
1502         const u8 *end, *pos;
1503
1504         buf = wpabuf_alloc(res->ie_len);
1505         if (buf == NULL)
1506                 return NULL;
1507
1508         pos = (const u8 *) (res + 1);
1509         end = pos + res->ie_len;
1510
1511         while (pos + 1 < end) {
1512                 if (pos + 2 + pos[1] > end)
1513                         break;
1514                 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1515                     vendor_type == WPA_GET_BE32(&pos[2]))
1516                         wpabuf_put_data(buf, pos + 2 + 4, pos[1] - 4);
1517                 pos += 2 + pos[1];
1518         }
1519
1520         if (wpabuf_len(buf) == 0) {
1521                 wpabuf_free(buf);
1522                 buf = NULL;
1523         }
1524
1525         return buf;
1526 }
1527
1528
1529 /*
1530  * Channels with a great SNR can operate at full rate. What is a great SNR?
1531  * This doc https://supportforums.cisco.com/docs/DOC-12954 says, "the general
1532  * rule of thumb is that any SNR above 20 is good." This one
1533  * http://www.cisco.com/en/US/tech/tk722/tk809/technologies_q_and_a_item09186a00805e9a96.shtml#qa23
1534  * recommends 25 as a minimum SNR for 54 Mbps data rate. 30 is chosen here as a
1535  * conservative value.
1536  */
1537 #define GREAT_SNR 30
1538
1539 /* Compare function for sorting scan results. Return >0 if @b is considered
1540  * better. */
1541 static int wpa_scan_result_compar(const void *a, const void *b)
1542 {
1543 #define IS_5GHZ(n) (n > 4000)
1544 #define MIN(a,b) a < b ? a : b
1545         struct wpa_scan_res **_wa = (void *) a;
1546         struct wpa_scan_res **_wb = (void *) b;
1547         struct wpa_scan_res *wa = *_wa;
1548         struct wpa_scan_res *wb = *_wb;
1549         int wpa_a, wpa_b, maxrate_a, maxrate_b;
1550         int snr_a, snr_b;
1551
1552         /* WPA/WPA2 support preferred */
1553         wpa_a = wpa_scan_get_vendor_ie(wa, WPA_IE_VENDOR_TYPE) != NULL ||
1554                 wpa_scan_get_ie(wa, WLAN_EID_RSN) != NULL;
1555         wpa_b = wpa_scan_get_vendor_ie(wb, WPA_IE_VENDOR_TYPE) != NULL ||
1556                 wpa_scan_get_ie(wb, WLAN_EID_RSN) != NULL;
1557
1558         if (wpa_b && !wpa_a)
1559                 return 1;
1560         if (!wpa_b && wpa_a)
1561                 return -1;
1562
1563         /* privacy support preferred */
1564         if ((wa->caps & IEEE80211_CAP_PRIVACY) == 0 &&
1565             (wb->caps & IEEE80211_CAP_PRIVACY))
1566                 return 1;
1567         if ((wa->caps & IEEE80211_CAP_PRIVACY) &&
1568             (wb->caps & IEEE80211_CAP_PRIVACY) == 0)
1569                 return -1;
1570
1571         if ((wa->flags & wb->flags & WPA_SCAN_LEVEL_DBM) &&
1572             !((wa->flags | wb->flags) & WPA_SCAN_NOISE_INVALID)) {
1573                 snr_a = MIN(wa->level - wa->noise, GREAT_SNR);
1574                 snr_b = MIN(wb->level - wb->noise, GREAT_SNR);
1575         } else {
1576                 /* Not suitable information to calculate SNR, so use level */
1577                 snr_a = wa->level;
1578                 snr_b = wb->level;
1579         }
1580
1581         /* best/max rate preferred if SNR close enough */
1582         if ((snr_a && snr_b && abs(snr_b - snr_a) < 5) ||
1583             (wa->qual && wb->qual && abs(wb->qual - wa->qual) < 10)) {
1584                 maxrate_a = wpa_scan_get_max_rate(wa);
1585                 maxrate_b = wpa_scan_get_max_rate(wb);
1586                 if (maxrate_a != maxrate_b)
1587                         return maxrate_b - maxrate_a;
1588                 if (IS_5GHZ(wa->freq) ^ IS_5GHZ(wb->freq))
1589                         return IS_5GHZ(wa->freq) ? -1 : 1;
1590         }
1591
1592         /* use freq for channel preference */
1593
1594         /* all things being equal, use SNR; if SNRs are
1595          * identical, use quality values since some drivers may only report
1596          * that value and leave the signal level zero */
1597         if (snr_b == snr_a)
1598                 return wb->qual - wa->qual;
1599         return snr_b - snr_a;
1600 #undef MIN
1601 #undef IS_5GHZ
1602 }
1603
1604
1605 #ifdef CONFIG_WPS
1606 /* Compare function for sorting scan results when searching a WPS AP for
1607  * provisioning. Return >0 if @b is considered better. */
1608 static int wpa_scan_result_wps_compar(const void *a, const void *b)
1609 {
1610         struct wpa_scan_res **_wa = (void *) a;
1611         struct wpa_scan_res **_wb = (void *) b;
1612         struct wpa_scan_res *wa = *_wa;
1613         struct wpa_scan_res *wb = *_wb;
1614         int uses_wps_a, uses_wps_b;
1615         struct wpabuf *wps_a, *wps_b;
1616         int res;
1617
1618         /* Optimization - check WPS IE existence before allocated memory and
1619          * doing full reassembly. */
1620         uses_wps_a = wpa_scan_get_vendor_ie(wa, WPS_IE_VENDOR_TYPE) != NULL;
1621         uses_wps_b = wpa_scan_get_vendor_ie(wb, WPS_IE_VENDOR_TYPE) != NULL;
1622         if (uses_wps_a && !uses_wps_b)
1623                 return -1;
1624         if (!uses_wps_a && uses_wps_b)
1625                 return 1;
1626
1627         if (uses_wps_a && uses_wps_b) {
1628                 wps_a = wpa_scan_get_vendor_ie_multi(wa, WPS_IE_VENDOR_TYPE);
1629                 wps_b = wpa_scan_get_vendor_ie_multi(wb, WPS_IE_VENDOR_TYPE);
1630                 res = wps_ap_priority_compar(wps_a, wps_b);
1631                 wpabuf_free(wps_a);
1632                 wpabuf_free(wps_b);
1633                 if (res)
1634                         return res;
1635         }
1636
1637         /*
1638          * Do not use current AP security policy as a sorting criteria during
1639          * WPS provisioning step since the AP may get reconfigured at the
1640          * completion of provisioning.
1641          */
1642
1643         /* all things being equal, use signal level; if signal levels are
1644          * identical, use quality values since some drivers may only report
1645          * that value and leave the signal level zero */
1646         if (wb->level == wa->level)
1647                 return wb->qual - wa->qual;
1648         return wb->level - wa->level;
1649 }
1650 #endif /* CONFIG_WPS */
1651
1652
1653 static void dump_scan_res(struct wpa_scan_results *scan_res)
1654 {
1655 #ifndef CONFIG_NO_STDOUT_DEBUG
1656         size_t i;
1657
1658         if (scan_res->res == NULL || scan_res->num == 0)
1659                 return;
1660
1661         wpa_printf(MSG_EXCESSIVE, "Sorted scan results");
1662
1663         for (i = 0; i < scan_res->num; i++) {
1664                 struct wpa_scan_res *r = scan_res->res[i];
1665                 u8 *pos;
1666                 if ((r->flags & (WPA_SCAN_LEVEL_DBM | WPA_SCAN_NOISE_INVALID))
1667                     == WPA_SCAN_LEVEL_DBM) {
1668                         int snr = r->level - r->noise;
1669                         wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d "
1670                                    "noise=%d level=%d snr=%d%s flags=0x%x "
1671                                    "age=%u",
1672                                    MAC2STR(r->bssid), r->freq, r->qual,
1673                                    r->noise, r->level, snr,
1674                                    snr >= GREAT_SNR ? "*" : "", r->flags,
1675                                    r->age);
1676                 } else {
1677                         wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d "
1678                                    "noise=%d level=%d flags=0x%x age=%u",
1679                                    MAC2STR(r->bssid), r->freq, r->qual,
1680                                    r->noise, r->level, r->flags, r->age);
1681                 }
1682                 pos = (u8 *) (r + 1);
1683                 if (r->ie_len)
1684                         wpa_hexdump(MSG_EXCESSIVE, "IEs", pos, r->ie_len);
1685                 pos += r->ie_len;
1686                 if (r->beacon_ie_len)
1687                         wpa_hexdump(MSG_EXCESSIVE, "Beacon IEs",
1688                                     pos, r->beacon_ie_len);
1689         }
1690 #endif /* CONFIG_NO_STDOUT_DEBUG */
1691 }
1692
1693
1694 /**
1695  * wpa_supplicant_filter_bssid_match - Is the specified BSSID allowed
1696  * @wpa_s: Pointer to wpa_supplicant data
1697  * @bssid: BSSID to check
1698  * Returns: 0 if the BSSID is filtered or 1 if not
1699  *
1700  * This function is used to filter out specific BSSIDs from scan reslts mainly
1701  * for testing purposes (SET bssid_filter ctrl_iface command).
1702  */
1703 int wpa_supplicant_filter_bssid_match(struct wpa_supplicant *wpa_s,
1704                                       const u8 *bssid)
1705 {
1706         size_t i;
1707
1708         if (wpa_s->bssid_filter == NULL)
1709                 return 1;
1710
1711         for (i = 0; i < wpa_s->bssid_filter_count; i++) {
1712                 if (os_memcmp(wpa_s->bssid_filter + i * ETH_ALEN, bssid,
1713                               ETH_ALEN) == 0)
1714                         return 1;
1715         }
1716
1717         return 0;
1718 }
1719
1720
1721 static void filter_scan_res(struct wpa_supplicant *wpa_s,
1722                             struct wpa_scan_results *res)
1723 {
1724         size_t i, j;
1725
1726         if (wpa_s->bssid_filter == NULL)
1727                 return;
1728
1729         for (i = 0, j = 0; i < res->num; i++) {
1730                 if (wpa_supplicant_filter_bssid_match(wpa_s,
1731                                                       res->res[i]->bssid)) {
1732                         res->res[j++] = res->res[i];
1733                 } else {
1734                         os_free(res->res[i]);
1735                         res->res[i] = NULL;
1736                 }
1737         }
1738
1739         if (res->num != j) {
1740                 wpa_printf(MSG_DEBUG, "Filtered out %d scan results",
1741                            (int) (res->num - j));
1742                 res->num = j;
1743         }
1744 }
1745
1746
1747 /**
1748  * wpa_supplicant_get_scan_results - Get scan results
1749  * @wpa_s: Pointer to wpa_supplicant data
1750  * @info: Information about what was scanned or %NULL if not available
1751  * @new_scan: Whether a new scan was performed
1752  * Returns: Scan results, %NULL on failure
1753  *
1754  * This function request the current scan results from the driver and updates
1755  * the local BSS list wpa_s->bss. The caller is responsible for freeing the
1756  * results with wpa_scan_results_free().
1757  */
1758 struct wpa_scan_results *
1759 wpa_supplicant_get_scan_results(struct wpa_supplicant *wpa_s,
1760                                 struct scan_info *info, int new_scan)
1761 {
1762         struct wpa_scan_results *scan_res;
1763         size_t i;
1764         int (*compar)(const void *, const void *) = wpa_scan_result_compar;
1765
1766         scan_res = wpa_drv_get_scan_results2(wpa_s);
1767         if (scan_res == NULL) {
1768                 wpa_dbg(wpa_s, MSG_DEBUG, "Failed to get scan results");
1769                 return NULL;
1770         }
1771         if (scan_res->fetch_time.sec == 0) {
1772                 /*
1773                  * Make sure we have a valid timestamp if the driver wrapper
1774                  * does not set this.
1775                  */
1776                 os_get_reltime(&scan_res->fetch_time);
1777         }
1778         filter_scan_res(wpa_s, scan_res);
1779
1780 #ifdef CONFIG_WPS
1781         if (wpas_wps_searching(wpa_s)) {
1782                 wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Order scan results with WPS "
1783                         "provisioning rules");
1784                 compar = wpa_scan_result_wps_compar;
1785         }
1786 #endif /* CONFIG_WPS */
1787
1788         qsort(scan_res->res, scan_res->num, sizeof(struct wpa_scan_res *),
1789               compar);
1790         dump_scan_res(scan_res);
1791
1792         wpa_bss_update_start(wpa_s);
1793         for (i = 0; i < scan_res->num; i++)
1794                 wpa_bss_update_scan_res(wpa_s, scan_res->res[i],
1795                                         &scan_res->fetch_time);
1796         wpa_bss_update_end(wpa_s, info, new_scan);
1797
1798         return scan_res;
1799 }
1800
1801
1802 /**
1803  * wpa_supplicant_update_scan_results - Update scan results from the driver
1804  * @wpa_s: Pointer to wpa_supplicant data
1805  * Returns: 0 on success, -1 on failure
1806  *
1807  * This function updates the BSS table within wpa_supplicant based on the
1808  * currently available scan results from the driver without requesting a new
1809  * scan. This is used in cases where the driver indicates an association
1810  * (including roaming within ESS) and wpa_supplicant does not yet have the
1811  * needed information to complete the connection (e.g., to perform validation
1812  * steps in 4-way handshake).
1813  */
1814 int wpa_supplicant_update_scan_results(struct wpa_supplicant *wpa_s)
1815 {
1816         struct wpa_scan_results *scan_res;
1817         scan_res = wpa_supplicant_get_scan_results(wpa_s, NULL, 0);
1818         if (scan_res == NULL)
1819                 return -1;
1820         wpa_scan_results_free(scan_res);
1821
1822         return 0;
1823 }
1824
1825
1826 /**
1827  * scan_only_handler - Reports scan results
1828  */
1829 void scan_only_handler(struct wpa_supplicant *wpa_s,
1830                        struct wpa_scan_results *scan_res)
1831 {
1832         wpa_dbg(wpa_s, MSG_DEBUG, "Scan-only results received");
1833         if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
1834             wpa_s->manual_scan_use_id && wpa_s->own_scan_running) {
1835                 wpa_msg_ctrl(wpa_s, MSG_INFO, WPA_EVENT_SCAN_RESULTS "id=%u",
1836                              wpa_s->manual_scan_id);
1837                 wpa_s->manual_scan_use_id = 0;
1838         } else {
1839                 wpa_msg_ctrl(wpa_s, MSG_INFO, WPA_EVENT_SCAN_RESULTS);
1840         }
1841         wpas_notify_scan_results(wpa_s);
1842         wpas_notify_scan_done(wpa_s, 1);
1843         if (wpa_s->scan_work) {
1844                 struct wpa_radio_work *work = wpa_s->scan_work;
1845                 wpa_s->scan_work = NULL;
1846                 radio_work_done(work);
1847         }
1848 }
1849
1850
1851 int wpas_scan_scheduled(struct wpa_supplicant *wpa_s)
1852 {
1853         return eloop_is_timeout_registered(wpa_supplicant_scan, wpa_s, NULL);
1854 }
1855
1856
1857 struct wpa_driver_scan_params *
1858 wpa_scan_clone_params(const struct wpa_driver_scan_params *src)
1859 {
1860         struct wpa_driver_scan_params *params;
1861         size_t i;
1862         u8 *n;
1863
1864         params = os_zalloc(sizeof(*params));
1865         if (params == NULL)
1866                 return NULL;
1867
1868         for (i = 0; i < src->num_ssids; i++) {
1869                 if (src->ssids[i].ssid) {
1870                         n = os_malloc(src->ssids[i].ssid_len);
1871                         if (n == NULL)
1872                                 goto failed;
1873                         os_memcpy(n, src->ssids[i].ssid,
1874                                   src->ssids[i].ssid_len);
1875                         params->ssids[i].ssid = n;
1876                         params->ssids[i].ssid_len = src->ssids[i].ssid_len;
1877                 }
1878         }
1879         params->num_ssids = src->num_ssids;
1880
1881         if (src->extra_ies) {
1882                 n = os_malloc(src->extra_ies_len);
1883                 if (n == NULL)
1884                         goto failed;
1885                 os_memcpy(n, src->extra_ies, src->extra_ies_len);
1886                 params->extra_ies = n;
1887                 params->extra_ies_len = src->extra_ies_len;
1888         }
1889
1890         if (src->freqs) {
1891                 int len = int_array_len(src->freqs);
1892                 params->freqs = os_malloc((len + 1) * sizeof(int));
1893                 if (params->freqs == NULL)
1894                         goto failed;
1895                 os_memcpy(params->freqs, src->freqs, (len + 1) * sizeof(int));
1896         }
1897
1898         if (src->filter_ssids) {
1899                 params->filter_ssids = os_malloc(sizeof(*params->filter_ssids) *
1900                                                  src->num_filter_ssids);
1901                 if (params->filter_ssids == NULL)
1902                         goto failed;
1903                 os_memcpy(params->filter_ssids, src->filter_ssids,
1904                           sizeof(*params->filter_ssids) *
1905                           src->num_filter_ssids);
1906                 params->num_filter_ssids = src->num_filter_ssids;
1907         }
1908
1909         params->filter_rssi = src->filter_rssi;
1910         params->p2p_probe = src->p2p_probe;
1911         params->only_new_results = src->only_new_results;
1912         params->low_priority = src->low_priority;
1913
1914         return params;
1915
1916 failed:
1917         wpa_scan_free_params(params);
1918         return NULL;
1919 }
1920
1921
1922 void wpa_scan_free_params(struct wpa_driver_scan_params *params)
1923 {
1924         size_t i;
1925
1926         if (params == NULL)
1927                 return;
1928
1929         for (i = 0; i < params->num_ssids; i++)
1930                 os_free((u8 *) params->ssids[i].ssid);
1931         os_free((u8 *) params->extra_ies);
1932         os_free(params->freqs);
1933         os_free(params->filter_ssids);
1934         os_free(params);
1935 }
1936
1937
1938 int wpas_start_pno(struct wpa_supplicant *wpa_s)
1939 {
1940         int ret, interval;
1941         size_t i, num_ssid, num_match_ssid;
1942         struct wpa_ssid *ssid;
1943         struct wpa_driver_scan_params params;
1944
1945         if (!wpa_s->sched_scan_supported)
1946                 return -1;
1947
1948         if (wpa_s->pno || wpa_s->pno_sched_pending)
1949                 return 0;
1950
1951         if ((wpa_s->wpa_state > WPA_SCANNING) &&
1952             (wpa_s->wpa_state <= WPA_COMPLETED)) {
1953                 wpa_printf(MSG_ERROR, "PNO: In assoc process");
1954                 return -EAGAIN;
1955         }
1956
1957         if (wpa_s->wpa_state == WPA_SCANNING) {
1958                 wpa_supplicant_cancel_scan(wpa_s);
1959                 if (wpa_s->sched_scanning) {
1960                         wpa_printf(MSG_DEBUG, "Schedule PNO on completion of "
1961                                    "ongoing sched scan");
1962                         wpa_supplicant_cancel_sched_scan(wpa_s);
1963                         wpa_s->pno_sched_pending = 1;
1964                         return 0;
1965                 }
1966         }
1967
1968         os_memset(&params, 0, sizeof(params));
1969
1970         num_ssid = num_match_ssid = 0;
1971         ssid = wpa_s->conf->ssid;
1972         while (ssid) {
1973                 if (!wpas_network_disabled(wpa_s, ssid)) {
1974                         num_match_ssid++;
1975                         if (ssid->scan_ssid)
1976                                 num_ssid++;
1977                 }
1978                 ssid = ssid->next;
1979         }
1980
1981         if (num_match_ssid == 0) {
1982                 wpa_printf(MSG_DEBUG, "PNO: No configured SSIDs");
1983                 return -1;
1984         }
1985
1986         if (num_match_ssid > num_ssid) {
1987                 params.num_ssids++; /* wildcard */
1988                 num_ssid++;
1989         }
1990
1991         if (num_ssid > WPAS_MAX_SCAN_SSIDS) {
1992                 wpa_printf(MSG_DEBUG, "PNO: Use only the first %u SSIDs from "
1993                            "%u", WPAS_MAX_SCAN_SSIDS, (unsigned int) num_ssid);
1994                 num_ssid = WPAS_MAX_SCAN_SSIDS;
1995         }
1996
1997         if (num_match_ssid > wpa_s->max_match_sets) {
1998                 num_match_ssid = wpa_s->max_match_sets;
1999                 wpa_dbg(wpa_s, MSG_DEBUG, "PNO: Too many SSIDs to match");
2000         }
2001         params.filter_ssids = os_calloc(num_match_ssid,
2002                                         sizeof(struct wpa_driver_scan_filter));
2003         if (params.filter_ssids == NULL)
2004                 return -1;
2005         i = 0;
2006         ssid = wpa_s->conf->ssid;
2007         while (ssid) {
2008                 if (!wpas_network_disabled(wpa_s, ssid)) {
2009                         if (ssid->scan_ssid && params.num_ssids < num_ssid) {
2010                                 params.ssids[params.num_ssids].ssid =
2011                                         ssid->ssid;
2012                                 params.ssids[params.num_ssids].ssid_len =
2013                                          ssid->ssid_len;
2014                                 params.num_ssids++;
2015                         }
2016                         os_memcpy(params.filter_ssids[i].ssid, ssid->ssid,
2017                                   ssid->ssid_len);
2018                         params.filter_ssids[i].ssid_len = ssid->ssid_len;
2019                         params.num_filter_ssids++;
2020                         i++;
2021                         if (i == num_match_ssid)
2022                                 break;
2023                 }
2024                 ssid = ssid->next;
2025         }
2026
2027         if (wpa_s->conf->filter_rssi)
2028                 params.filter_rssi = wpa_s->conf->filter_rssi;
2029
2030         interval = wpa_s->conf->sched_scan_interval ?
2031                 wpa_s->conf->sched_scan_interval : 10;
2032
2033         if (params.freqs == NULL && wpa_s->manual_sched_scan_freqs) {
2034                 wpa_dbg(wpa_s, MSG_DEBUG, "Limit sched scan to specified channels");
2035                 params.freqs = wpa_s->manual_sched_scan_freqs;
2036         }
2037
2038         ret = wpa_supplicant_start_sched_scan(wpa_s, &params, interval);
2039         os_free(params.filter_ssids);
2040         if (ret == 0)
2041                 wpa_s->pno = 1;
2042         else
2043                 wpa_msg(wpa_s, MSG_ERROR, "Failed to schedule PNO");
2044         return ret;
2045 }
2046
2047
2048 int wpas_stop_pno(struct wpa_supplicant *wpa_s)
2049 {
2050         int ret = 0;
2051
2052         if (!wpa_s->pno)
2053                 return 0;
2054
2055         ret = wpa_supplicant_stop_sched_scan(wpa_s);
2056
2057         wpa_s->pno = 0;
2058         wpa_s->pno_sched_pending = 0;
2059
2060         if (wpa_s->wpa_state == WPA_SCANNING)
2061                 wpa_supplicant_req_scan(wpa_s, 0, 0);
2062
2063         return ret;
2064 }