wpa_supplicant/scan.c

   1 /*
   2  * WPA Supplicant - Scanning
   3  * Copyright (c) 2003-2010, 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 "config.h"
  15 #include "wpa_supplicant_i.h"
  16 #include "driver_i.h"
  17 #include "wps_supplicant.h"
  18 #include "p2p_supplicant.h"
  19 #include "p2p/p2p.h"
  20 #include "notify.h"
  21 #include "bss.h"
  22 #include "scan.h"
  23
  24
  25 static void wpa_supplicant_gen_assoc_event(struct wpa_supplicant *wpa_s)
  26 {
  27         struct wpa_ssid *ssid;
  28         union wpa_event_data data;
  29
  30         ssid = wpa_supplicant_get_ssid(wpa_s);
  31         if (ssid == NULL)
  32                 return;
  33
  34         if (wpa_s->current_ssid == NULL) {
  35                 wpa_s->current_ssid = ssid;
  36                 if (wpa_s->current_ssid != NULL)
  37                         wpas_notify_network_changed(wpa_s);
  38         }
  39         wpa_supplicant_initiate_eapol(wpa_s);
  40         wpa_dbg(wpa_s, MSG_DEBUG, "Already associated with a configured "
  41                 "network - generating associated event");
  42         os_memset(&data, 0, sizeof(data));
  43         wpa_supplicant_event(wpa_s, EVENT_ASSOC, &data);
  44 }
  45
  46
  47 #ifdef CONFIG_WPS
  48 static int wpas_wps_in_use(struct wpa_supplicant *wpa_s,
  49                            enum wps_request_type *req_type)
  50 {
  51         struct wpa_ssid *ssid;
  52         int wps = 0;
  53
  54         for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
  55                 if (!(ssid->key_mgmt & WPA_KEY_MGMT_WPS))
  56                         continue;
  57
  58                 wps = 1;
  59                 *req_type = wpas_wps_get_req_type(ssid);
  60                 if (!ssid->eap.phase1)
  61                         continue;
  62
  63                 if (os_strstr(ssid->eap.phase1, "pbc=1"))
  64                         return 2;
  65         }
  66
  67 #ifdef CONFIG_P2P
  68         if (!wpa_s->global->p2p_disabled && wpa_s->global->p2p) {
  69                 wpa_s->wps->dev.p2p = 1;
  70                 if (!wps) {
  71                         wps = 1;
  72                         *req_type = WPS_REQ_ENROLLEE_INFO;
  73                 }
  74         }
  75 #endif /* CONFIG_P2P */
  76
  77         return wps;
  78 }
  79 #endif /* CONFIG_WPS */
  80
  81
  82 int wpa_supplicant_enabled_networks(struct wpa_config *conf)
  83 {
  84         struct wpa_ssid *ssid = conf->ssid;
  85         int count = 0;
  86         while (ssid) {
  87                 if (!ssid->disabled)
  88                         count++;
  89                 ssid = ssid->next;
  90         }
  91         return count;
  92 }
  93
  94
  95 static void wpa_supplicant_assoc_try(struct wpa_supplicant *wpa_s,
  96                                      struct wpa_ssid *ssid)
  97 {
  98         while (ssid) {
  99                 if (!ssid->disabled)
 100                         break;
 101                 ssid = ssid->next;
 102         }
 103
 104         /* ap_scan=2 mode - try to associate with each SSID. */
 105         if (ssid == NULL) {
 106                 wpa_dbg(wpa_s, MSG_DEBUG, "wpa_supplicant_assoc_try: Reached "
 107                         "end of scan list - go back to beginning");
 108                 wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
 109                 wpa_supplicant_req_scan(wpa_s, 0, 0);
 110                 return;
 111         }
 112         if (ssid->next) {
 113                 /* Continue from the next SSID on the next attempt. */
 114                 wpa_s->prev_scan_ssid = ssid;
 115         } else {
 116                 /* Start from the beginning of the SSID list. */
 117                 wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
 118         }
 119         wpa_supplicant_associate(wpa_s, NULL, ssid);
 120 }
 121
 122
 123 static int int_array_len(const int *a)
 124 {
 125         int i;
 126         for (i = 0; a && a[i]; i++)
 127                 ;
 128         return i;
 129 }
 130
 131
 132 static void int_array_concat(int **res, const int *a)
 133 {
 134         int reslen, alen, i;
 135         int *n;
 136
 137         reslen = int_array_len(*res);
 138         alen = int_array_len(a);
 139
 140         n = os_realloc(*res, (reslen + alen + 1) * sizeof(int));
 141         if (n == NULL) {
 142                 os_free(*res);
 143                 *res = NULL;
 144                 return;
 145         }
 146         for (i = 0; i <= alen; i++)
 147                 n[reslen + i] = a[i];
 148         *res = n;
 149 }
 150
 151
 152 static int freq_cmp(const void *a, const void *b)
 153 {
 154         int _a = *(int *) a;
 155         int _b = *(int *) b;
 156
 157         if (_a == 0)
 158                 return 1;
 159         if (_b == 0)
 160                 return -1;
 161         return _a - _b;
 162 }
 163
 164
 165 static void int_array_sort_unique(int *a)
 166 {
 167         int alen;
 168         int i, j;
 169
 170         if (a == NULL)
 171                 return;
 172
 173         alen = int_array_len(a);
 174         qsort(a, alen, sizeof(int), freq_cmp);
 175
 176         i = 0;
 177         j = 1;
 178         while (a[i] && a[j]) {
 179                 if (a[i] == a[j]) {
 180                         j++;
 181                         continue;
 182                 }
 183                 a[++i] = a[j++];
 184         }
 185         if (a[i])
 186                 i++;
 187         a[i] = 0;
 188 }
 189
 190
 191 int wpa_supplicant_trigger_scan(struct wpa_supplicant *wpa_s,
 192                                 struct wpa_driver_scan_params *params)
 193 {
 194         int ret;
 195
 196         wpa_supplicant_notify_scanning(wpa_s, 1);
 197
 198         ret = wpa_drv_scan(wpa_s, params);
 199         if (ret) {
 200                 wpa_supplicant_notify_scanning(wpa_s, 0);
 201                 wpas_notify_scan_done(wpa_s, 0);
 202         } else {
 203                 wpa_s->scan_runs++;
 204                 wpa_s->normal_scans++;
 205         }
 206
 207         return ret;
 208 }
 209
 210
 211 static void
 212 wpa_supplicant_delayed_sched_scan_timeout(void *eloop_ctx, void *timeout_ctx)
 213 {
 214         struct wpa_supplicant *wpa_s = eloop_ctx;
 215
 216         wpa_dbg(wpa_s, MSG_DEBUG, "Starting delayed sched scan");
 217
 218         if (wpa_supplicant_req_sched_scan(wpa_s))
 219                 wpa_supplicant_req_scan(wpa_s, 0, 0);
 220 }
 221
 222
 223 static void
 224 wpa_supplicant_sched_scan_timeout(void *eloop_ctx, void *timeout_ctx)
 225 {
 226         struct wpa_supplicant *wpa_s = eloop_ctx;
 227
 228         wpa_dbg(wpa_s, MSG_DEBUG, "Sched scan timeout - stopping it");
 229
 230         wpa_s->sched_scan_timed_out = 1;
 231         wpa_supplicant_cancel_sched_scan(wpa_s);
 232 }
 233
 234
 235 static int
 236 wpa_supplicant_start_sched_scan(struct wpa_supplicant *wpa_s,
 237                                 struct wpa_driver_scan_params *params,
 238                                 int interval)
 239 {
 240         int ret;
 241
 242         wpa_supplicant_notify_scanning(wpa_s, 1);
 243         ret = wpa_drv_sched_scan(wpa_s, params, interval * 1000);
 244         if (ret)
 245                 wpa_supplicant_notify_scanning(wpa_s, 0);
 246         else
 247                 wpa_s->sched_scanning = 1;
 248
 249         return ret;
 250 }
 251
 252
 253 static int wpa_supplicant_stop_sched_scan(struct wpa_supplicant *wpa_s)
 254 {
 255         int ret;
 256
 257         ret = wpa_drv_stop_sched_scan(wpa_s);
 258         if (ret) {
 259                 wpa_dbg(wpa_s, MSG_DEBUG, "stopping sched_scan failed!");
 260                 /* TODO: what to do if stopping fails? */
 261                 return -1;
 262         }
 263
 264         return ret;
 265 }
 266
 267
 268 static struct wpa_driver_scan_filter *
 269 wpa_supplicant_build_filter_ssids(struct wpa_config *conf, size_t *num_ssids)
 270 {
 271         struct wpa_driver_scan_filter *ssids;
 272         struct wpa_ssid *ssid;
 273         size_t count;
 274
 275         *num_ssids = 0;
 276         if (!conf->filter_ssids)
 277                 return NULL;
 278
 279         for (count = 0, ssid = conf->ssid; ssid; ssid = ssid->next) {
 280                 if (ssid->ssid && ssid->ssid_len)
 281                         count++;
 282         }
 283         if (count == 0)
 284                 return NULL;
 285         ssids = os_zalloc(count * sizeof(struct wpa_driver_scan_filter));
 286         if (ssids == NULL)
 287                 return NULL;
 288
 289         for (ssid = conf->ssid; ssid; ssid = ssid->next) {
 290                 if (!ssid->ssid || !ssid->ssid_len)
 291                         continue;
 292                 os_memcpy(ssids[*num_ssids].ssid, ssid->ssid, ssid->ssid_len);
 293                 ssids[*num_ssids].ssid_len = ssid->ssid_len;
 294                 (*num_ssids)++;
 295         }
 296
 297         return ssids;
 298 }
 299
 300
 301 static void wpa_supplicant_optimize_freqs(
 302         struct wpa_supplicant *wpa_s, struct wpa_driver_scan_params *params)
 303 {
 304 #ifdef CONFIG_P2P
 305         if (params->freqs == NULL && wpa_s->p2p_in_provisioning &&
 306             wpa_s->go_params) {
 307                 /* Optimize provisioning state scan based on GO information */
 308                 if (wpa_s->p2p_in_provisioning < 5 &&
 309                     wpa_s->go_params->freq > 0) {
 310                         wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only GO "
 311                                 "preferred frequency %d MHz",
 312                                 wpa_s->go_params->freq);
 313                         params->freqs = os_zalloc(2 * sizeof(int));
 314                         if (params->freqs)
 315                                 params->freqs[0] = wpa_s->go_params->freq;
 316                 } else if (wpa_s->p2p_in_provisioning < 8 &&
 317                            wpa_s->go_params->freq_list[0]) {
 318                         wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only common "
 319                                 "channels");
 320                         int_array_concat(&params->freqs,
 321                                          wpa_s->go_params->freq_list);
 322                         if (params->freqs)
 323                                 int_array_sort_unique(params->freqs);
 324                 }
 325                 wpa_s->p2p_in_provisioning++;
 326         }
 327 #endif /* CONFIG_P2P */
 328
 329 #ifdef CONFIG_WPS
 330         if (params->freqs == NULL && wpa_s->after_wps && wpa_s->wps_freq) {
 331                 /*
 332                  * Optimize post-provisioning scan based on channel used
 333                  * during provisioning.
 334                  */
 335                 wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Scan only frequency %u MHz "
 336                         "that was used during provisioning", wpa_s->wps_freq);
 337                 params->freqs = os_zalloc(2 * sizeof(int));
 338                 if (params->freqs)
 339                         params->freqs[0] = wpa_s->wps_freq;
 340                 wpa_s->after_wps--;
 341         }
 342
 343         if (params->freqs == NULL && wpa_s->known_wps_freq && wpa_s->wps_freq)
 344         {
 345                 /* Optimize provisioning scan based on already known channel */
 346                 wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Scan only frequency %u MHz",
 347                         wpa_s->wps_freq);
 348                 params->freqs = os_zalloc(2 * sizeof(int));
 349                 if (params->freqs)
 350                         params->freqs[0] = wpa_s->wps_freq;
 351                 wpa_s->known_wps_freq = 0; /* only do this once */
 352         }
 353 #endif /* CONFIG_WPS */
 354 }
 355
 356
 357 #ifdef CONFIG_INTERWORKING
 358 static void wpas_add_interworking_elements(struct wpa_supplicant *wpa_s,
 359                                            struct wpabuf *buf)
 360 {
 361         if (wpa_s->conf->interworking == 0)
 362                 return;
 363
 364         wpabuf_put_u8(buf, WLAN_EID_EXT_CAPAB);
 365         wpabuf_put_u8(buf, 4);
 366         wpabuf_put_u8(buf, 0x00);
 367         wpabuf_put_u8(buf, 0x00);
 368         wpabuf_put_u8(buf, 0x00);
 369         wpabuf_put_u8(buf, 0x80); /* Bit 31 - Interworking */
 370
 371         wpabuf_put_u8(buf, WLAN_EID_INTERWORKING);
 372         wpabuf_put_u8(buf, is_zero_ether_addr(wpa_s->conf->hessid) ? 1 :
 373                       1 + ETH_ALEN);
 374         wpabuf_put_u8(buf, wpa_s->conf->access_network_type);
 375         /* No Venue Info */
 376         if (!is_zero_ether_addr(wpa_s->conf->hessid))
 377                 wpabuf_put_data(buf, wpa_s->conf->hessid, ETH_ALEN);
 378 }
 379 #endif /* CONFIG_INTERWORKING */
 380
 381
 382 static struct wpabuf *
 383 wpa_supplicant_extra_ies(struct wpa_supplicant *wpa_s,
 384                          struct wpa_driver_scan_params *params)
 385 {
 386         struct wpabuf *extra_ie = NULL;
 387 #ifdef CONFIG_WPS
 388         int wps = 0;
 389         enum wps_request_type req_type = WPS_REQ_ENROLLEE_INFO;
 390 #endif /* CONFIG_WPS */
 391
 392 #ifdef CONFIG_INTERWORKING
 393         if (wpa_s->conf->interworking &&
 394             wpabuf_resize(&extra_ie, 100) == 0)
 395                 wpas_add_interworking_elements(wpa_s, extra_ie);
 396 #endif /* CONFIG_INTERWORKING */
 397
 398 #ifdef CONFIG_WPS
 399         wps = wpas_wps_in_use(wpa_s, &req_type);
 400
 401         if (wps) {
 402                 struct wpabuf *wps_ie;
 403                 wps_ie = wps_build_probe_req_ie(wps == 2, &wpa_s->wps->dev,
 404                                                 wpa_s->wps->uuid, req_type,
 405                                                 0, NULL);
 406                 if (wps_ie) {
 407                         if (wpabuf_resize(&extra_ie, wpabuf_len(wps_ie)) == 0)
 408                                 wpabuf_put_buf(extra_ie, wps_ie);
 409                         wpabuf_free(wps_ie);
 410                 }
 411         }
 412
 413 #ifdef CONFIG_P2P
 414         if (wps) {
 415                 size_t ielen = p2p_scan_ie_buf_len(wpa_s->global->p2p);
 416                 if (wpabuf_resize(&extra_ie, ielen) == 0)
 417                         wpas_p2p_scan_ie(wpa_s, extra_ie);
 418         }
 419 #endif /* CONFIG_P2P */
 420
 421 #endif /* CONFIG_WPS */
 422
 423         return extra_ie;
 424 }
 425
 426
 427 static void wpa_supplicant_scan(void *eloop_ctx, void *timeout_ctx)
 428 {
 429         struct wpa_supplicant *wpa_s = eloop_ctx;
 430         struct wpa_ssid *ssid;
 431         int scan_req = 0, ret;
 432         struct wpabuf *extra_ie;
 433         struct wpa_driver_scan_params params;
 434         size_t max_ssids;
 435         enum wpa_states prev_state;
 436
 437         if (wpa_s->wpa_state == WPA_INTERFACE_DISABLED) {
 438                 wpa_dbg(wpa_s, MSG_DEBUG, "Skip scan - interface disabled");
 439                 return;
 440         }
 441
 442         if (wpa_s->disconnected && !wpa_s->scan_req) {
 443                 wpa_supplicant_set_state(wpa_s, WPA_DISCONNECTED);
 444                 return;
 445         }
 446
 447         if (!wpa_supplicant_enabled_networks(wpa_s->conf) &&
 448             !wpa_s->scan_req) {
 449                 wpa_dbg(wpa_s, MSG_DEBUG, "No enabled networks - do not scan");
 450                 wpa_supplicant_set_state(wpa_s, WPA_INACTIVE);
 451                 return;
 452         }
 453
 454         if (wpa_s->conf->ap_scan != 0 &&
 455             (wpa_s->drv_flags & WPA_DRIVER_FLAGS_WIRED)) {
 456                 wpa_dbg(wpa_s, MSG_DEBUG, "Using wired authentication - "
 457                         "overriding ap_scan configuration");
 458                 wpa_s->conf->ap_scan = 0;
 459                 wpas_notify_ap_scan_changed(wpa_s);
 460         }
 461
 462         if (wpa_s->conf->ap_scan == 0) {
 463                 wpa_supplicant_gen_assoc_event(wpa_s);
 464                 return;
 465         }
 466
 467 #ifdef CONFIG_P2P
 468         if (wpas_p2p_in_progress(wpa_s)) {
 469                 if (wpa_s->wpa_state == WPA_SCANNING) {
 470                         wpa_dbg(wpa_s, MSG_DEBUG, "Delay station mode scan "
 471                                 "while P2P operation is in progress");
 472                         wpa_supplicant_req_scan(wpa_s, 5, 0);
 473                 } else {
 474                         wpa_dbg(wpa_s, MSG_DEBUG, "Do not request scan while "
 475                                 "P2P operation is in progress");
 476                 }
 477                 return;
 478         }
 479 #endif /* CONFIG_P2P */
 480
 481         if (wpa_s->conf->ap_scan == 2)
 482                 max_ssids = 1;
 483         else {
 484                 max_ssids = wpa_s->max_scan_ssids;
 485                 if (max_ssids > WPAS_MAX_SCAN_SSIDS)
 486                         max_ssids = WPAS_MAX_SCAN_SSIDS;
 487         }
 488
 489         scan_req = wpa_s->scan_req;
 490         wpa_s->scan_req = 0;
 491
 492         os_memset(&params, 0, sizeof(params));
 493
 494         prev_state = wpa_s->wpa_state;
 495         if (wpa_s->wpa_state == WPA_DISCONNECTED ||
 496             wpa_s->wpa_state == WPA_INACTIVE)
 497                 wpa_supplicant_set_state(wpa_s, WPA_SCANNING);
 498
 499         if (scan_req != 2 && wpa_s->connect_without_scan) {
 500                 for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
 501                         if (ssid == wpa_s->connect_without_scan)
 502                                 break;
 503                 }
 504                 wpa_s->connect_without_scan = NULL;
 505                 if (ssid) {
 506                         wpa_printf(MSG_DEBUG, "Start a pre-selected network "
 507                                    "without scan step");
 508                         wpa_supplicant_associate(wpa_s, NULL, ssid);
 509                         return;
 510                 }
 511         }
 512
 513         /* Find the starting point from which to continue scanning */
 514         ssid = wpa_s->conf->ssid;
 515         if (wpa_s->prev_scan_ssid != WILDCARD_SSID_SCAN) {
 516                 while (ssid) {
 517                         if (ssid == wpa_s->prev_scan_ssid) {
 518                                 ssid = ssid->next;
 519                                 break;
 520                         }
 521                         ssid = ssid->next;
 522                 }
 523         }
 524
 525         if (scan_req != 2 && wpa_s->conf->ap_scan == 2) {
 526                 wpa_s->connect_without_scan = NULL;
 527                 wpa_s->prev_scan_wildcard = 0;
 528                 wpa_supplicant_assoc_try(wpa_s, ssid);
 529                 return;
 530         } else if (wpa_s->conf->ap_scan == 2) {
 531                 /*
 532                  * User-initiated scan request in ap_scan == 2; scan with
 533                  * wildcard SSID.
 534                  */
 535                 ssid = NULL;
 536         } else {
 537                 struct wpa_ssid *start = ssid, *tssid;
 538                 int freqs_set = 0;
 539                 if (ssid == NULL && max_ssids > 1)
 540                         ssid = wpa_s->conf->ssid;
 541                 while (ssid) {
 542                         if (!ssid->disabled && ssid->scan_ssid) {
 543                                 wpa_hexdump_ascii(MSG_DEBUG, "Scan SSID",
 544                                                   ssid->ssid, ssid->ssid_len);
 545                                 params.ssids[params.num_ssids].ssid =
 546                                         ssid->ssid;
 547                                 params.ssids[params.num_ssids].ssid_len =
 548                                         ssid->ssid_len;
 549                                 params.num_ssids++;
 550                                 if (params.num_ssids + 1 >= max_ssids)
 551                                         break;
 552                         }
 553                         ssid = ssid->next;
 554                         if (ssid == start)
 555                                 break;
 556                         if (ssid == NULL && max_ssids > 1 &&
 557                             start != wpa_s->conf->ssid)
 558                                 ssid = wpa_s->conf->ssid;
 559                 }
 560
 561                 for (tssid = wpa_s->conf->ssid; tssid; tssid = tssid->next) {
 562                         if (tssid->disabled)
 563                                 continue;
 564                         if ((params.freqs || !freqs_set) && tssid->scan_freq) {
 565                                 int_array_concat(&params.freqs,
 566                                                  tssid->scan_freq);
 567                         } else {
 568                                 os_free(params.freqs);
 569                                 params.freqs = NULL;
 570                         }
 571                         freqs_set = 1;
 572                 }
 573                 int_array_sort_unique(params.freqs);
 574         }
 575
 576         if (ssid && max_ssids == 1) {
 577                 /*
 578                  * If the driver is limited to 1 SSID at a time interleave
 579                  * wildcard SSID scans with specific SSID scans to avoid
 580                  * waiting a long time for a wildcard scan.
 581                  */
 582                 if (!wpa_s->prev_scan_wildcard) {
 583                         params.ssids[0].ssid = NULL;
 584                         params.ssids[0].ssid_len = 0;
 585                         wpa_s->prev_scan_wildcard = 1;
 586                         wpa_dbg(wpa_s, MSG_DEBUG, "Starting AP scan for "
 587                                 "wildcard SSID (Interleave with specific)");
 588                 } else {
 589                         wpa_s->prev_scan_ssid = ssid;
 590                         wpa_s->prev_scan_wildcard = 0;
 591                         wpa_dbg(wpa_s, MSG_DEBUG,
 592                                 "Starting AP scan for specific SSID: %s",
 593                                 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
 594                 }
 595         } else if (ssid) {
 596                 /* max_ssids > 1 */
 597
 598                 wpa_s->prev_scan_ssid = ssid;
 599                 wpa_dbg(wpa_s, MSG_DEBUG, "Include wildcard SSID in "
 600                         "the scan request");
 601                 params.num_ssids++;
 602         } else {
 603                 wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
 604                 params.num_ssids++;
 605                 wpa_dbg(wpa_s, MSG_DEBUG, "Starting AP scan for wildcard "
 606                         "SSID");
 607         }
 608
 609         wpa_supplicant_optimize_freqs(wpa_s, &params);
 610         extra_ie = wpa_supplicant_extra_ies(wpa_s, &params);
 611
 612         if (params.freqs == NULL && wpa_s->next_scan_freqs) {
 613                 wpa_dbg(wpa_s, MSG_DEBUG, "Optimize scan based on previously "
 614                         "generated frequency list");
 615                 params.freqs = wpa_s->next_scan_freqs;
 616         } else
 617                 os_free(wpa_s->next_scan_freqs);
 618         wpa_s->next_scan_freqs = NULL;
 619
 620         params.filter_ssids = wpa_supplicant_build_filter_ssids(
 621                 wpa_s->conf, &params.num_filter_ssids);
 622         if (extra_ie) {
 623                 params.extra_ies = wpabuf_head(extra_ie);
 624                 params.extra_ies_len = wpabuf_len(extra_ie);
 625         }
 626
 627 #ifdef CONFIG_P2P
 628         if (wpa_s->p2p_in_provisioning) {
 629                 /*
 630                  * The interface may not yet be in P2P mode, so we have to
 631                  * explicitly request P2P probe to disable CCK rates.
 632                  */
 633                 params.p2p_probe = 1;
 634         }
 635 #endif /* CONFIG_P2P */
 636
 637         ret = wpa_supplicant_trigger_scan(wpa_s, &params);
 638
 639         wpabuf_free(extra_ie);
 640         os_free(params.freqs);
 641         os_free(params.filter_ssids);
 642
 643         if (ret) {
 644                 wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate AP scan");
 645                 if (prev_state != wpa_s->wpa_state)
 646                         wpa_supplicant_set_state(wpa_s, prev_state);
 647                 wpa_supplicant_req_scan(wpa_s, 1, 0);
 648         }
 649 }
 650
 651
 652 /**
 653  * wpa_supplicant_req_scan - Schedule a scan for neighboring access points
 654  * @wpa_s: Pointer to wpa_supplicant data
 655  * @sec: Number of seconds after which to scan
 656  * @usec: Number of microseconds after which to scan
 657  *
 658  * This function is used to schedule a scan for neighboring access points after
 659  * the specified time.
 660  */
 661 void wpa_supplicant_req_scan(struct wpa_supplicant *wpa_s, int sec, int usec)
 662 {
 663         /* If there's at least one network that should be specifically scanned
 664          * then don't cancel the scan and reschedule.  Some drivers do
 665          * background scanning which generates frequent scan results, and that
 666          * causes the specific SSID scan to get continually pushed back and
 667          * never happen, which causes hidden APs to never get probe-scanned.
 668          */
 669         if (eloop_is_timeout_registered(wpa_supplicant_scan, wpa_s, NULL) &&
 670             wpa_s->conf->ap_scan == 1) {
 671                 struct wpa_ssid *ssid = wpa_s->conf->ssid;
 672
 673                 while (ssid) {
 674                         if (!ssid->disabled && ssid->scan_ssid)
 675                                 break;
 676                         ssid = ssid->next;
 677                 }
 678                 if (ssid) {
 679                         wpa_dbg(wpa_s, MSG_DEBUG, "Not rescheduling scan to "
 680                                 "ensure that specific SSID scans occur");
 681                         return;
 682                 }
 683         }
 684
 685         wpa_dbg(wpa_s, MSG_DEBUG, "Setting scan request: %d sec %d usec",
 686                 sec, usec);
 687         eloop_cancel_timeout(wpa_supplicant_scan, wpa_s, NULL);
 688         eloop_register_timeout(sec, usec, wpa_supplicant_scan, wpa_s, NULL);
 689 }
 690
 691
 692 /**
 693  * wpa_supplicant_delayed_sched_scan - Request a delayed scheduled scan
 694  * @wpa_s: Pointer to wpa_supplicant data
 695  * @sec: Number of seconds after which to scan
 696  * @usec: Number of microseconds after which to scan
 697  *
 698  * This function is used to schedule periodic scans for neighboring
 699  * access points after the specified time.
 700  */
 701 int wpa_supplicant_delayed_sched_scan(struct wpa_supplicant *wpa_s,
 702                                       int sec, int usec)
 703 {
 704         if (!wpa_s->sched_scan_supported)
 705                 return -1;
 706
 707         eloop_register_timeout(sec, usec,
 708                                wpa_supplicant_delayed_sched_scan_timeout,
 709                                wpa_s, NULL);
 710
 711         return 0;
 712 }
 713
 714
 715 /**
 716  * wpa_supplicant_req_sched_scan - Start a periodic scheduled scan
 717  * @wpa_s: Pointer to wpa_supplicant data
 718  *
 719  * This function is used to schedule periodic scans for neighboring
 720  * access points repeating the scan continuously.
 721  */
 722 int wpa_supplicant_req_sched_scan(struct wpa_supplicant *wpa_s)
 723 {
 724         struct wpa_driver_scan_params params;
 725         enum wpa_states prev_state;
 726         struct wpa_ssid *ssid;
 727         struct wpabuf *wps_ie = NULL;
 728         int ret;
 729         unsigned int max_sched_scan_ssids;
 730         int wildcard = 0;
 731         int need_ssids;
 732
 733         if (!wpa_s->sched_scan_supported)
 734                 return -1;
 735
 736         if (wpa_s->max_sched_scan_ssids > WPAS_MAX_SCAN_SSIDS)
 737                 max_sched_scan_ssids = WPAS_MAX_SCAN_SSIDS;
 738         else
 739                 max_sched_scan_ssids = wpa_s->max_sched_scan_ssids;
 740         if (max_sched_scan_ssids < 1)
 741                 return -1;
 742
 743         if (wpa_s->sched_scanning) {
 744                 wpa_dbg(wpa_s, MSG_DEBUG, "Already sched scanning");
 745                 return 0;
 746         }
 747
 748         need_ssids = 0;
 749         for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
 750                 if (!ssid->disabled && !ssid->scan_ssid) {
 751                         /* Use wildcard SSID to find this network */
 752                         wildcard = 1;
 753                 } else if (!ssid->disabled && ssid->ssid_len)
 754                         need_ssids++;
 755
 756 #ifdef CONFIG_WPS
 757                 if (!ssid->disabled && ssid->key_mgmt == WPA_KEY_MGMT_WPS) {
 758                         /*
 759                          * Normal scan is more reliable and faster for WPS
 760                          * operations and since these are for short periods of
 761                          * time, the benefit of trying to use sched_scan would
 762                          * be limited.
 763                          */
 764                         wpa_dbg(wpa_s, MSG_DEBUG, "Use normal scan instead of "
 765                                 "sched_scan for WPS");
 766                         return -1;
 767                 }
 768 #endif /* CONFIG_WPS */
 769         }
 770         if (wildcard)
 771                 need_ssids++;
 772
 773         if (wpa_s->normal_scans < 3 &&
 774             (need_ssids <= wpa_s->max_scan_ssids ||
 775              wpa_s->max_scan_ssids >= (int) max_sched_scan_ssids)) {
 776                 /*
 777                  * When normal scan can speed up operations, use that for the
 778                  * first operations before starting the sched_scan to allow
 779                  * user space sleep more. We do this only if the normal scan
 780                  * has functionality that is suitable for this or if the
 781                  * sched_scan does not have better support for multiple SSIDs.
 782                  */
 783                 wpa_dbg(wpa_s, MSG_DEBUG, "Use normal scan instead of "
 784                         "sched_scan for initial scans (normal_scans=%d)",
 785                         wpa_s->normal_scans);
 786                 return -1;
 787         }
 788
 789         os_memset(&params, 0, sizeof(params));
 790
 791         /* If we can't allocate space for the filters, we just don't filter */
 792         params.filter_ssids = os_zalloc(wpa_s->max_match_sets *
 793                                         sizeof(struct wpa_driver_scan_filter));
 794
 795         prev_state = wpa_s->wpa_state;
 796         if (wpa_s->wpa_state == WPA_DISCONNECTED ||
 797             wpa_s->wpa_state == WPA_INACTIVE)
 798                 wpa_supplicant_set_state(wpa_s, WPA_SCANNING);
 799
 800         /* Find the starting point from which to continue scanning */
 801         ssid = wpa_s->conf->ssid;
 802         if (wpa_s->prev_sched_ssid) {
 803                 while (ssid) {
 804                         if (ssid == wpa_s->prev_sched_ssid) {
 805                                 ssid = ssid->next;
 806                                 break;
 807                         }
 808                         ssid = ssid->next;
 809                 }
 810         }
 811
 812         if (!ssid || !wpa_s->prev_sched_ssid) {
 813                 wpa_dbg(wpa_s, MSG_DEBUG, "Beginning of SSID list");
 814
 815                 wpa_s->sched_scan_interval = 10;
 816                 wpa_s->sched_scan_timeout = max_sched_scan_ssids * 2;
 817                 wpa_s->first_sched_scan = 1;
 818                 ssid = wpa_s->conf->ssid;
 819                 wpa_s->prev_sched_ssid = ssid;
 820         }
 821
 822         if (wildcard) {
 823                 wpa_dbg(wpa_s, MSG_DEBUG, "Add wildcard SSID to sched_scan");
 824                 params.num_ssids++;
 825         }
 826
 827         while (ssid) {
 828                 if (ssid->disabled)
 829                         goto next;
 830
 831                 if (params.num_filter_ssids < wpa_s->max_match_sets &&
 832                     params.filter_ssids && ssid->ssid && ssid->ssid_len) {
 833                         wpa_dbg(wpa_s, MSG_DEBUG, "add to filter ssid: %s",
 834                                 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
 835                         os_memcpy(params.filter_ssids[params.num_filter_ssids].ssid,
 836                                   ssid->ssid, ssid->ssid_len);
 837                         params.filter_ssids[params.num_filter_ssids].ssid_len =
 838                                 ssid->ssid_len;
 839                         params.num_filter_ssids++;
 840                 } else if (params.filter_ssids && ssid->ssid && ssid->ssid_len)
 841                 {
 842                         wpa_dbg(wpa_s, MSG_DEBUG, "Not enough room for SSID "
 843                                 "filter for sched_scan - drop filter");
 844                         os_free(params.filter_ssids);
 845                         params.filter_ssids = NULL;
 846                         params.num_filter_ssids = 0;
 847                 }
 848
 849                 if (ssid->scan_ssid && ssid->ssid && ssid->ssid_len) {
 850                         if (params.num_ssids == max_sched_scan_ssids)
 851                                 break; /* only room for broadcast SSID */
 852                         wpa_dbg(wpa_s, MSG_DEBUG,
 853                                 "add to active scan ssid: %s",
 854                                 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
 855                         params.ssids[params.num_ssids].ssid =
 856                                 ssid->ssid;
 857                         params.ssids[params.num_ssids].ssid_len =
 858                                 ssid->ssid_len;
 859                         params.num_ssids++;
 860                         if (params.num_ssids >= max_sched_scan_ssids) {
 861                                 wpa_s->prev_sched_ssid = ssid;
 862                                 break;
 863                         }
 864                 }
 865
 866         next:
 867                 wpa_s->prev_sched_ssid = ssid;
 868                 ssid = ssid->next;
 869         }
 870
 871         if (params.num_filter_ssids == 0) {
 872                 os_free(params.filter_ssids);
 873                 params.filter_ssids = NULL;
 874         }
 875
 876         if (wpa_s->wps)
 877                 wps_ie = wpa_supplicant_extra_ies(wpa_s, &params);
 878
 879         if (ssid || !wpa_s->first_sched_scan) {
 880                 wpa_dbg(wpa_s, MSG_DEBUG,
 881                         "Starting sched scan: interval %d (no timeout)",
 882                         wpa_s->sched_scan_interval);
 883         } else {
 884                 wpa_dbg(wpa_s, MSG_DEBUG,
 885                         "Starting sched scan: interval %d timeout %d",
 886                         wpa_s->sched_scan_interval, wpa_s->sched_scan_timeout);
 887         }
 888
 889         ret = wpa_supplicant_start_sched_scan(wpa_s, &params,
 890                                               wpa_s->sched_scan_interval);
 891         wpabuf_free(wps_ie);
 892         os_free(params.filter_ssids);
 893         if (ret) {
 894                 wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate sched scan");
 895                 if (prev_state != wpa_s->wpa_state)
 896                         wpa_supplicant_set_state(wpa_s, prev_state);
 897                 return ret;
 898         }
 899
 900         /* If we have more SSIDs to scan, add a timeout so we scan them too */
 901         if (ssid || !wpa_s->first_sched_scan) {
 902                 wpa_s->sched_scan_timed_out = 0;
 903                 eloop_register_timeout(wpa_s->sched_scan_timeout, 0,
 904                                        wpa_supplicant_sched_scan_timeout,
 905                                        wpa_s, NULL);
 906                 wpa_s->first_sched_scan = 0;
 907                 wpa_s->sched_scan_timeout /= 2;
 908                 wpa_s->sched_scan_interval *= 2;
 909         }
 910
 911         return 0;
 912 }
 913
 914
 915 /**
 916  * wpa_supplicant_cancel_scan - Cancel a scheduled scan request
 917  * @wpa_s: Pointer to wpa_supplicant data
 918  *
 919  * This function is used to cancel a scan request scheduled with
 920  * wpa_supplicant_req_scan().
 921  */
 922 void wpa_supplicant_cancel_scan(struct wpa_supplicant *wpa_s)
 923 {
 924         wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling scan request");
 925         eloop_cancel_timeout(wpa_supplicant_scan, wpa_s, NULL);
 926 }
 927
 928
 929 /**
 930  * wpa_supplicant_cancel_sched_scan - Stop running scheduled scans
 931  * @wpa_s: Pointer to wpa_supplicant data
 932  *
 933  * This function is used to stop a periodic scheduled scan.
 934  */
 935 void wpa_supplicant_cancel_sched_scan(struct wpa_supplicant *wpa_s)
 936 {
 937         if (!wpa_s->sched_scanning)
 938                 return;
 939
 940         wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling sched scan");
 941         eloop_cancel_timeout(wpa_supplicant_sched_scan_timeout, wpa_s, NULL);
 942         wpa_supplicant_stop_sched_scan(wpa_s);
 943 }
 944
 945
 946 void wpa_supplicant_notify_scanning(struct wpa_supplicant *wpa_s,
 947                                     int scanning)
 948 {
 949         if (wpa_s->scanning != scanning) {
 950                 wpa_s->scanning = scanning;
 951                 wpas_notify_scanning(wpa_s);
 952         }
 953 }
 954
 955
 956 static int wpa_scan_get_max_rate(const struct wpa_scan_res *res)
 957 {
 958         int rate = 0;
 959         const u8 *ie;
 960         int i;
 961
 962         ie = wpa_scan_get_ie(res, WLAN_EID_SUPP_RATES);
 963         for (i = 0; ie && i < ie[1]; i++) {
 964                 if ((ie[i + 2] & 0x7f) > rate)
 965                         rate = ie[i + 2] & 0x7f;
 966         }
 967
 968         ie = wpa_scan_get_ie(res, WLAN_EID_EXT_SUPP_RATES);
 969         for (i = 0; ie && i < ie[1]; i++) {
 970                 if ((ie[i + 2] & 0x7f) > rate)
 971                         rate = ie[i + 2] & 0x7f;
 972         }
 973
 974         return rate;
 975 }
 976
 977
 978 const u8 * wpa_scan_get_ie(const struct wpa_scan_res *res, u8 ie)
 979 {
 980         const u8 *end, *pos;
 981
 982         pos = (const u8 *) (res + 1);
 983         end = pos + res->ie_len;
 984
 985         while (pos + 1 < end) {
 986                 if (pos + 2 + pos[1] > end)
 987                         break;
 988                 if (pos[0] == ie)
 989                         return pos;
 990                 pos += 2 + pos[1];
 991         }
 992
 993         return NULL;
 994 }
 995
 996
 997 const u8 * wpa_scan_get_vendor_ie(const struct wpa_scan_res *res,
 998                                   u32 vendor_type)
 999 {
1000         const u8 *end, *pos;
1001
1002         pos = (const u8 *) (res + 1);
1003         end = pos + res->ie_len;
1004
1005         while (pos + 1 < end) {
1006                 if (pos + 2 + pos[1] > end)
1007                         break;
1008                 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1009                     vendor_type == WPA_GET_BE32(&pos[2]))
1010                         return pos;
1011                 pos += 2 + pos[1];
1012         }
1013
1014         return NULL;
1015 }
1016
1017
1018 struct wpabuf * wpa_scan_get_vendor_ie_multi(const struct wpa_scan_res *res,
1019                                              u32 vendor_type)
1020 {
1021         struct wpabuf *buf;
1022         const u8 *end, *pos;
1023
1024         buf = wpabuf_alloc(res->ie_len);
1025         if (buf == NULL)
1026                 return NULL;
1027
1028         pos = (const u8 *) (res + 1);
1029         end = pos + res->ie_len;
1030
1031         while (pos + 1 < end) {
1032                 if (pos + 2 + pos[1] > end)
1033                         break;
1034                 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1035                     vendor_type == WPA_GET_BE32(&pos[2]))
1036                         wpabuf_put_data(buf, pos + 2 + 4, pos[1] - 4);
1037                 pos += 2 + pos[1];
1038         }
1039
1040         if (wpabuf_len(buf) == 0) {
1041                 wpabuf_free(buf);
1042                 buf = NULL;
1043         }
1044
1045         return buf;
1046 }
1047
1048
1049 struct wpabuf * wpa_scan_get_vendor_ie_multi_beacon(
1050         const struct wpa_scan_res *res, u32 vendor_type)
1051 {
1052         struct wpabuf *buf;
1053         const u8 *end, *pos;
1054
1055         if (res->beacon_ie_len == 0)
1056                 return NULL;
1057         buf = wpabuf_alloc(res->beacon_ie_len);
1058         if (buf == NULL)
1059                 return NULL;
1060
1061         pos = (const u8 *) (res + 1);
1062         pos += res->ie_len;
1063         end = pos + res->beacon_ie_len;
1064
1065         while (pos + 1 < end) {
1066                 if (pos + 2 + pos[1] > end)
1067                         break;
1068                 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1069                     vendor_type == WPA_GET_BE32(&pos[2]))
1070                         wpabuf_put_data(buf, pos + 2 + 4, pos[1] - 4);
1071                 pos += 2 + pos[1];
1072         }
1073
1074         if (wpabuf_len(buf) == 0) {
1075                 wpabuf_free(buf);
1076                 buf = NULL;
1077         }
1078
1079         return buf;
1080 }
1081
1082
1083 /*
1084  * Channels with a great SNR can operate at full rate. What is a great SNR?
1085  * This doc https://supportforums.cisco.com/docs/DOC-12954 says, "the general
1086  * rule of thumb is that any SNR above 20 is good." This one
1087  * http://www.cisco.com/en/US/tech/tk722/tk809/technologies_q_and_a_item09186a00805e9a96.shtml#qa23
1088  * recommends 25 as a minimum SNR for 54 Mbps data rate. 30 is chosen here as a
1089  * conservative value.
1090  */
1091 #define GREAT_SNR 30
1092
1093 /* Compare function for sorting scan results. Return >0 if @b is considered
1094  * better. */
1095 static int wpa_scan_result_compar(const void *a, const void *b)
1096 {
1097 #define IS_5GHZ(n) (n > 4000)
1098 #define MIN(a,b) a < b ? a : b
1099         struct wpa_scan_res **_wa = (void *) a;
1100         struct wpa_scan_res **_wb = (void *) b;
1101         struct wpa_scan_res *wa = *_wa;
1102         struct wpa_scan_res *wb = *_wb;
1103         int wpa_a, wpa_b, maxrate_a, maxrate_b;
1104         int snr_a, snr_b;
1105
1106         /* WPA/WPA2 support preferred */
1107         wpa_a = wpa_scan_get_vendor_ie(wa, WPA_IE_VENDOR_TYPE) != NULL ||
1108                 wpa_scan_get_ie(wa, WLAN_EID_RSN) != NULL;
1109         wpa_b = wpa_scan_get_vendor_ie(wb, WPA_IE_VENDOR_TYPE) != NULL ||
1110                 wpa_scan_get_ie(wb, WLAN_EID_RSN) != NULL;
1111
1112         if (wpa_b && !wpa_a)
1113                 return 1;
1114         if (!wpa_b && wpa_a)
1115                 return -1;
1116
1117         /* privacy support preferred */
1118         if ((wa->caps & IEEE80211_CAP_PRIVACY) == 0 &&
1119             (wb->caps & IEEE80211_CAP_PRIVACY))
1120                 return 1;
1121         if ((wa->caps & IEEE80211_CAP_PRIVACY) &&
1122             (wb->caps & IEEE80211_CAP_PRIVACY) == 0)
1123                 return -1;
1124
1125         if ((wa->flags & wb->flags & WPA_SCAN_LEVEL_DBM) &&
1126             !((wa->flags | wb->flags) & WPA_SCAN_NOISE_INVALID)) {
1127                 snr_a = MIN(wa->level - wa->noise, GREAT_SNR);
1128                 snr_b = MIN(wb->level - wb->noise, GREAT_SNR);
1129         } else {
1130                 /* Not suitable information to calculate SNR, so use level */
1131                 snr_a = wa->level;
1132                 snr_b = wb->level;
1133         }
1134
1135         /* best/max rate preferred if SNR close enough */
1136         if ((snr_a && snr_b && abs(snr_b - snr_a) < 5) ||
1137             (wa->qual && wb->qual && abs(wb->qual - wa->qual) < 10)) {
1138                 maxrate_a = wpa_scan_get_max_rate(wa);
1139                 maxrate_b = wpa_scan_get_max_rate(wb);
1140                 if (maxrate_a != maxrate_b)
1141                         return maxrate_b - maxrate_a;
1142                 if (IS_5GHZ(wa->freq) ^ IS_5GHZ(wb->freq))
1143                         return IS_5GHZ(wa->freq) ? -1 : 1;
1144         }
1145
1146         /* use freq for channel preference */
1147
1148         /* all things being equal, use SNR; if SNRs are
1149          * identical, use quality values since some drivers may only report
1150          * that value and leave the signal level zero */
1151         if (snr_b == snr_a)
1152                 return wb->qual - wa->qual;
1153         return snr_b - snr_a;
1154 #undef MIN
1155 #undef IS_5GHZ
1156 }
1157
1158
1159 #ifdef CONFIG_WPS
1160 /* Compare function for sorting scan results when searching a WPS AP for
1161  * provisioning. Return >0 if @b is considered better. */
1162 static int wpa_scan_result_wps_compar(const void *a, const void *b)
1163 {
1164         struct wpa_scan_res **_wa = (void *) a;
1165         struct wpa_scan_res **_wb = (void *) b;
1166         struct wpa_scan_res *wa = *_wa;
1167         struct wpa_scan_res *wb = *_wb;
1168         int uses_wps_a, uses_wps_b;
1169         struct wpabuf *wps_a, *wps_b;
1170         int res;
1171
1172         /* Optimization - check WPS IE existence before allocated memory and
1173          * doing full reassembly. */
1174         uses_wps_a = wpa_scan_get_vendor_ie(wa, WPS_IE_VENDOR_TYPE) != NULL;
1175         uses_wps_b = wpa_scan_get_vendor_ie(wb, WPS_IE_VENDOR_TYPE) != NULL;
1176         if (uses_wps_a && !uses_wps_b)
1177                 return -1;
1178         if (!uses_wps_a && uses_wps_b)
1179                 return 1;
1180
1181         if (uses_wps_a && uses_wps_b) {
1182                 wps_a = wpa_scan_get_vendor_ie_multi(wa, WPS_IE_VENDOR_TYPE);
1183                 wps_b = wpa_scan_get_vendor_ie_multi(wb, WPS_IE_VENDOR_TYPE);
1184                 res = wps_ap_priority_compar(wps_a, wps_b);
1185                 wpabuf_free(wps_a);
1186                 wpabuf_free(wps_b);
1187                 if (res)
1188                         return res;
1189         }
1190
1191         /*
1192          * Do not use current AP security policy as a sorting criteria during
1193          * WPS provisioning step since the AP may get reconfigured at the
1194          * completion of provisioning.
1195          */
1196
1197         /* all things being equal, use signal level; if signal levels are
1198          * identical, use quality values since some drivers may only report
1199          * that value and leave the signal level zero */
1200         if (wb->level == wa->level)
1201                 return wb->qual - wa->qual;
1202         return wb->level - wa->level;
1203 }
1204 #endif /* CONFIG_WPS */
1205
1206
1207 static void dump_scan_res(struct wpa_scan_results *scan_res)
1208 {
1209 #ifndef CONFIG_NO_STDOUT_DEBUG
1210         size_t i;
1211
1212         if (scan_res->res == NULL || scan_res->num == 0)
1213                 return;
1214
1215         wpa_printf(MSG_EXCESSIVE, "Sorted scan results");
1216
1217         for (i = 0; i < scan_res->num; i++) {
1218                 struct wpa_scan_res *r = scan_res->res[i];
1219                 if ((r->flags & (WPA_SCAN_LEVEL_DBM | WPA_SCAN_NOISE_INVALID))
1220                     == WPA_SCAN_LEVEL_DBM) {
1221                         int snr = r->level - r->noise;
1222                         wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d "
1223                                    "noise=%d level=%d snr=%d%s flags=0x%x",
1224                                    MAC2STR(r->bssid), r->freq, r->qual,
1225                                    r->noise, r->level, snr,
1226                                    snr >= GREAT_SNR ? "*" : "", r->flags);
1227                 } else {
1228                         wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d "
1229                                    "noise=%d level=%d flags=0x%x",
1230                                    MAC2STR(r->bssid), r->freq, r->qual,
1231                                    r->noise, r->level, r->flags);
1232                 }
1233         }
1234 #endif /* CONFIG_NO_STDOUT_DEBUG */
1235 }
1236
1237
1238 int wpa_supplicant_filter_bssid_match(struct wpa_supplicant *wpa_s,
1239                                       const u8 *bssid)
1240 {
1241         size_t i;
1242
1243         if (wpa_s->bssid_filter == NULL)
1244                 return 1;
1245
1246         for (i = 0; i < wpa_s->bssid_filter_count; i++) {
1247                 if (os_memcmp(wpa_s->bssid_filter + i * ETH_ALEN, bssid,
1248                               ETH_ALEN) == 0)
1249                         return 1;
1250         }
1251
1252         return 0;
1253 }
1254
1255
1256 static void filter_scan_res(struct wpa_supplicant *wpa_s,
1257                             struct wpa_scan_results *res)
1258 {
1259         size_t i, j;
1260
1261         if (wpa_s->bssid_filter == NULL)
1262                 return;
1263
1264         for (i = 0, j = 0; i < res->num; i++) {
1265                 if (wpa_supplicant_filter_bssid_match(wpa_s,
1266                                                       res->res[i]->bssid)) {
1267                         res->res[j++] = res->res[i];
1268                 } else {
1269                         os_free(res->res[i]);
1270                         res->res[i] = NULL;
1271                 }
1272         }
1273
1274         if (res->num != j) {
1275                 wpa_printf(MSG_DEBUG, "Filtered out %d scan results",
1276                            (int) (res->num - j));
1277                 res->num = j;
1278         }
1279 }
1280
1281
1282 /**
1283  * wpa_supplicant_get_scan_results - Get scan results
1284  * @wpa_s: Pointer to wpa_supplicant data
1285  * @info: Information about what was scanned or %NULL if not available
1286  * @new_scan: Whether a new scan was performed
1287  * Returns: Scan results, %NULL on failure
1288  *
1289  * This function request the current scan results from the driver and updates
1290  * the local BSS list wpa_s->bss. The caller is responsible for freeing the
1291  * results with wpa_scan_results_free().
1292  */
1293 struct wpa_scan_results *
1294 wpa_supplicant_get_scan_results(struct wpa_supplicant *wpa_s,
1295                                 struct scan_info *info, int new_scan)
1296 {
1297         struct wpa_scan_results *scan_res;
1298         size_t i;
1299         int (*compar)(const void *, const void *) = wpa_scan_result_compar;
1300
1301         scan_res = wpa_drv_get_scan_results2(wpa_s);
1302         if (scan_res == NULL) {
1303                 wpa_dbg(wpa_s, MSG_DEBUG, "Failed to get scan results");
1304                 return NULL;
1305         }
1306         filter_scan_res(wpa_s, scan_res);
1307
1308 #ifdef CONFIG_WPS
1309         if (wpas_wps_in_progress(wpa_s)) {
1310                 wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Order scan results with WPS "
1311                         "provisioning rules");
1312                 compar = wpa_scan_result_wps_compar;
1313         }
1314 #endif /* CONFIG_WPS */
1315
1316         qsort(scan_res->res, scan_res->num, sizeof(struct wpa_scan_res *),
1317               compar);
1318         dump_scan_res(scan_res);
1319
1320         wpa_bss_update_start(wpa_s);
1321         for (i = 0; i < scan_res->num; i++)
1322                 wpa_bss_update_scan_res(wpa_s, scan_res->res[i]);
1323         wpa_bss_update_end(wpa_s, info, new_scan);
1324
1325         return scan_res;
1326 }
1327
1328
1329 int wpa_supplicant_update_scan_results(struct wpa_supplicant *wpa_s)
1330 {
1331         struct wpa_scan_results *scan_res;
1332         scan_res = wpa_supplicant_get_scan_results(wpa_s, NULL, 0);
1333         if (scan_res == NULL)
1334                 return -1;
1335         wpa_scan_results_free(scan_res);
1336
1337         return 0;
1338 }