wpa_supplicant/scan.c

   1 /*
   2  * WPA Supplicant - Scanning
   3  * Copyright (c) 2003-2014, Jouni Malinen <j@w1.fi>
   4  *
   5  * This software may be distributed under the terms of the BSD license.
   6  * See README for more details.
   7  */
   8
   9 #include "utils/includes.h"
  10
  11 #include "utils/common.h"
  12 #include "utils/eloop.h"
  13 #include "common/ieee802_11_defs.h"
  14 #include "common/wpa_ctrl.h"
  15 #include "config.h"
  16 #include "wpa_supplicant_i.h"
  17 #include "driver_i.h"
  18 #include "wps_supplicant.h"
  19 #include "p2p_supplicant.h"
  20 #include "p2p/p2p.h"
  21 #include "hs20_supplicant.h"
  22 #include "notify.h"
  23 #include "bss.h"
  24 #include "scan.h"
  25 #include "mesh.h"
  26
  27
  28 static void wpa_supplicant_gen_assoc_event(struct wpa_supplicant *wpa_s)
  29 {
  30         struct wpa_ssid *ssid;
  31         union wpa_event_data data;
  32
  33         ssid = wpa_supplicant_get_ssid(wpa_s);
  34         if (ssid == NULL)
  35                 return;
  36
  37         if (wpa_s->current_ssid == NULL) {
  38                 wpa_s->current_ssid = ssid;
  39                 wpas_notify_network_changed(wpa_s);
  40         }
  41         wpa_supplicant_initiate_eapol(wpa_s);
  42         wpa_dbg(wpa_s, MSG_DEBUG, "Already associated with a configured "
  43                 "network - generating associated event");
  44         os_memset(&data, 0, sizeof(data));
  45         wpa_supplicant_event(wpa_s, EVENT_ASSOC, &data);
  46 }
  47
  48
  49 #ifdef CONFIG_WPS
  50 static int wpas_wps_in_use(struct wpa_supplicant *wpa_s,
  51                            enum wps_request_type *req_type)
  52 {
  53         struct wpa_ssid *ssid;
  54         int wps = 0;
  55
  56         for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
  57                 if (!(ssid->key_mgmt & WPA_KEY_MGMT_WPS))
  58                         continue;
  59
  60                 wps = 1;
  61                 *req_type = wpas_wps_get_req_type(ssid);
  62                 if (ssid->eap.phase1 && os_strstr(ssid->eap.phase1, "pbc=1"))
  63                         return 2;
  64         }
  65
  66 #ifdef CONFIG_P2P
  67         if (!wpa_s->global->p2p_disabled && wpa_s->global->p2p &&
  68             !wpa_s->conf->p2p_disabled) {
  69                 wpa_s->wps->dev.p2p = 1;
  70                 if (!wps) {
  71                         wps = 1;
  72                         *req_type = WPS_REQ_ENROLLEE_INFO;
  73                 }
  74         }
  75 #endif /* CONFIG_P2P */
  76
  77         return wps;
  78 }
  79 #endif /* CONFIG_WPS */
  80
  81
  82 /**
  83  * wpa_supplicant_enabled_networks - Check whether there are enabled networks
  84  * @wpa_s: Pointer to wpa_supplicant data
  85  * Returns: 0 if no networks are enabled, >0 if networks are enabled
  86  *
  87  * This function is used to figure out whether any networks (or Interworking
  88  * with enabled credentials and auto_interworking) are present in the current
  89  * configuration.
  90  */
  91 int wpa_supplicant_enabled_networks(struct wpa_supplicant *wpa_s)
  92 {
  93         struct wpa_ssid *ssid = wpa_s->conf->ssid;
  94         int count = 0, disabled = 0;
  95
  96         if (wpa_s->p2p_mgmt)
  97                 return 0; /* no normal network profiles on p2p_mgmt interface */
  98
  99         while (ssid) {
 100                 if (!wpas_network_disabled(wpa_s, ssid))
 101                         count++;
 102                 else
 103                         disabled++;
 104                 ssid = ssid->next;
 105         }
 106         if (wpa_s->conf->cred && wpa_s->conf->interworking &&
 107             wpa_s->conf->auto_interworking)
 108                 count++;
 109         if (count == 0 && disabled > 0) {
 110                 wpa_dbg(wpa_s, MSG_DEBUG, "No enabled networks (%d disabled "
 111                         "networks)", disabled);
 112         }
 113         return count;
 114 }
 115
 116
 117 static void wpa_supplicant_assoc_try(struct wpa_supplicant *wpa_s,
 118                                      struct wpa_ssid *ssid)
 119 {
 120         while (ssid) {
 121                 if (!wpas_network_disabled(wpa_s, ssid))
 122                         break;
 123                 ssid = ssid->next;
 124         }
 125
 126         /* ap_scan=2 mode - try to associate with each SSID. */
 127         if (ssid == NULL) {
 128                 wpa_dbg(wpa_s, MSG_DEBUG, "wpa_supplicant_assoc_try: Reached "
 129                         "end of scan list - go back to beginning");
 130                 wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
 131                 wpa_supplicant_req_scan(wpa_s, 0, 0);
 132                 return;
 133         }
 134         if (ssid->next) {
 135                 /* Continue from the next SSID on the next attempt. */
 136                 wpa_s->prev_scan_ssid = ssid;
 137         } else {
 138                 /* Start from the beginning of the SSID list. */
 139                 wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
 140         }
 141         wpa_supplicant_associate(wpa_s, NULL, ssid);
 142 }
 143
 144
 145 static void wpas_trigger_scan_cb(struct wpa_radio_work *work, int deinit)
 146 {
 147         struct wpa_supplicant *wpa_s = work->wpa_s;
 148         struct wpa_driver_scan_params *params = work->ctx;
 149         int ret;
 150
 151         if (deinit) {
 152                 if (!work->started) {
 153                         wpa_scan_free_params(params);
 154                         return;
 155                 }
 156                 wpa_supplicant_notify_scanning(wpa_s, 0);
 157                 wpas_notify_scan_done(wpa_s, 0);
 158                 wpa_s->scan_work = NULL;
 159                 return;
 160         }
 161
 162         if (wpas_update_random_addr_disassoc(wpa_s) < 0) {
 163                 wpa_msg(wpa_s, MSG_INFO,
 164                         "Failed to assign random MAC address for a scan");
 165                 wpa_scan_free_params(params);
 166                 wpa_msg(wpa_s, MSG_INFO, WPA_EVENT_SCAN_FAILED "ret=-1");
 167                 radio_work_done(work);
 168                 return;
 169         }
 170
 171         wpa_supplicant_notify_scanning(wpa_s, 1);
 172
 173         if (wpa_s->clear_driver_scan_cache) {
 174                 wpa_printf(MSG_DEBUG,
 175                            "Request driver to clear scan cache due to local BSS flush");
 176                 params->only_new_results = 1;
 177         }
 178         ret = wpa_drv_scan(wpa_s, params);
 179         wpa_scan_free_params(params);
 180         work->ctx = NULL;
 181         if (ret) {
 182                 int retry = wpa_s->last_scan_req != MANUAL_SCAN_REQ;
 183
 184                 if (wpa_s->disconnected)
 185                         retry = 0;
 186
 187                 wpa_supplicant_notify_scanning(wpa_s, 0);
 188                 wpas_notify_scan_done(wpa_s, 0);
 189                 if (wpa_s->wpa_state == WPA_SCANNING)
 190                         wpa_supplicant_set_state(wpa_s,
 191                                                  wpa_s->scan_prev_wpa_state);
 192                 wpa_msg(wpa_s, MSG_INFO, WPA_EVENT_SCAN_FAILED "ret=%d%s",
 193                         ret, retry ? " retry=1" : "");
 194                 radio_work_done(work);
 195
 196                 if (retry) {
 197                         /* Restore scan_req since we will try to scan again */
 198                         wpa_s->scan_req = wpa_s->last_scan_req;
 199                         wpa_supplicant_req_scan(wpa_s, 1, 0);
 200                 }
 201                 return;
 202         }
 203
 204         os_get_reltime(&wpa_s->scan_trigger_time);
 205         wpa_s->scan_runs++;
 206         wpa_s->normal_scans++;
 207         wpa_s->own_scan_requested = 1;
 208         wpa_s->clear_driver_scan_cache = 0;
 209         wpa_s->scan_work = work;
 210 }
 211
 212
 213 /**
 214  * wpa_supplicant_trigger_scan - Request driver to start a scan
 215  * @wpa_s: Pointer to wpa_supplicant data
 216  * @params: Scan parameters
 217  * Returns: 0 on success, -1 on failure
 218  */
 219 int wpa_supplicant_trigger_scan(struct wpa_supplicant *wpa_s,
 220                                 struct wpa_driver_scan_params *params)
 221 {
 222         struct wpa_driver_scan_params *ctx;
 223
 224         if (wpa_s->scan_work) {
 225                 wpa_dbg(wpa_s, MSG_INFO, "Reject scan trigger since one is already pending");
 226                 return -1;
 227         }
 228
 229         ctx = wpa_scan_clone_params(params);
 230         if (!ctx ||
 231             radio_add_work(wpa_s, 0, "scan", 0, wpas_trigger_scan_cb, ctx) < 0)
 232         {
 233                 wpa_scan_free_params(ctx);
 234                 wpa_msg(wpa_s, MSG_INFO, WPA_EVENT_SCAN_FAILED "ret=-1");
 235                 return -1;
 236         }
 237
 238         return 0;
 239 }
 240
 241
 242 static void
 243 wpa_supplicant_delayed_sched_scan_timeout(void *eloop_ctx, void *timeout_ctx)
 244 {
 245         struct wpa_supplicant *wpa_s = eloop_ctx;
 246
 247         wpa_dbg(wpa_s, MSG_DEBUG, "Starting delayed sched scan");
 248
 249         if (wpa_supplicant_req_sched_scan(wpa_s))
 250                 wpa_supplicant_req_scan(wpa_s, 0, 0);
 251 }
 252
 253
 254 static void
 255 wpa_supplicant_sched_scan_timeout(void *eloop_ctx, void *timeout_ctx)
 256 {
 257         struct wpa_supplicant *wpa_s = eloop_ctx;
 258
 259         wpa_dbg(wpa_s, MSG_DEBUG, "Sched scan timeout - stopping it");
 260
 261         wpa_s->sched_scan_timed_out = 1;
 262         wpa_supplicant_cancel_sched_scan(wpa_s);
 263 }
 264
 265
 266 static int
 267 wpa_supplicant_start_sched_scan(struct wpa_supplicant *wpa_s,
 268                                 struct wpa_driver_scan_params *params)
 269 {
 270         int ret;
 271
 272         wpa_supplicant_notify_scanning(wpa_s, 1);
 273         ret = wpa_drv_sched_scan(wpa_s, params);
 274         if (ret)
 275                 wpa_supplicant_notify_scanning(wpa_s, 0);
 276         else
 277                 wpa_s->sched_scanning = 1;
 278
 279         return ret;
 280 }
 281
 282
 283 static int wpa_supplicant_stop_sched_scan(struct wpa_supplicant *wpa_s)
 284 {
 285         int ret;
 286
 287         ret = wpa_drv_stop_sched_scan(wpa_s);
 288         if (ret) {
 289                 wpa_dbg(wpa_s, MSG_DEBUG, "stopping sched_scan failed!");
 290                 /* TODO: what to do if stopping fails? */
 291                 return -1;
 292         }
 293
 294         return ret;
 295 }
 296
 297
 298 static struct wpa_driver_scan_filter *
 299 wpa_supplicant_build_filter_ssids(struct wpa_config *conf, size_t *num_ssids)
 300 {
 301         struct wpa_driver_scan_filter *ssids;
 302         struct wpa_ssid *ssid;
 303         size_t count;
 304
 305         *num_ssids = 0;
 306         if (!conf->filter_ssids)
 307                 return NULL;
 308
 309         for (count = 0, ssid = conf->ssid; ssid; ssid = ssid->next) {
 310                 if (ssid->ssid && ssid->ssid_len)
 311                         count++;
 312         }
 313         if (count == 0)
 314                 return NULL;
 315         ssids = os_calloc(count, sizeof(struct wpa_driver_scan_filter));
 316         if (ssids == NULL)
 317                 return NULL;
 318
 319         for (ssid = conf->ssid; ssid; ssid = ssid->next) {
 320                 if (!ssid->ssid || !ssid->ssid_len)
 321                         continue;
 322                 os_memcpy(ssids[*num_ssids].ssid, ssid->ssid, ssid->ssid_len);
 323                 ssids[*num_ssids].ssid_len = ssid->ssid_len;
 324                 (*num_ssids)++;
 325         }
 326
 327         return ssids;
 328 }
 329
 330
 331 static void wpa_supplicant_optimize_freqs(
 332         struct wpa_supplicant *wpa_s, struct wpa_driver_scan_params *params)
 333 {
 334 #ifdef CONFIG_P2P
 335         if (params->freqs == NULL && wpa_s->p2p_in_provisioning &&
 336             wpa_s->go_params) {
 337                 /* Optimize provisioning state scan based on GO information */
 338                 if (wpa_s->p2p_in_provisioning < 5 &&
 339                     wpa_s->go_params->freq > 0) {
 340                         wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only GO "
 341                                 "preferred frequency %d MHz",
 342                                 wpa_s->go_params->freq);
 343                         params->freqs = os_calloc(2, sizeof(int));
 344                         if (params->freqs)
 345                                 params->freqs[0] = wpa_s->go_params->freq;
 346                 } else if (wpa_s->p2p_in_provisioning < 8 &&
 347                            wpa_s->go_params->freq_list[0]) {
 348                         wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only common "
 349                                 "channels");
 350                         int_array_concat(&params->freqs,
 351                                          wpa_s->go_params->freq_list);
 352                         if (params->freqs)
 353                                 int_array_sort_unique(params->freqs);
 354                 }
 355                 wpa_s->p2p_in_provisioning++;
 356         }
 357
 358         if (params->freqs == NULL && wpa_s->p2p_in_invitation) {
 359                 /*
 360                  * Optimize scan based on GO information during persistent
 361                  * group reinvocation
 362                  */
 363                 if (wpa_s->p2p_in_invitation < 5 &&
 364                     wpa_s->p2p_invite_go_freq > 0) {
 365                         wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only GO preferred frequency %d MHz during invitation",
 366                                 wpa_s->p2p_invite_go_freq);
 367                         params->freqs = os_calloc(2, sizeof(int));
 368                         if (params->freqs)
 369                                 params->freqs[0] = wpa_s->p2p_invite_go_freq;
 370                 }
 371                 wpa_s->p2p_in_invitation++;
 372                 if (wpa_s->p2p_in_invitation > 20) {
 373                         /*
 374                          * This should not really happen since the variable is
 375                          * cleared on group removal, but if it does happen, make
 376                          * sure we do not get stuck in special invitation scan
 377                          * mode.
 378                          */
 379                         wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Clear p2p_in_invitation");
 380                         wpa_s->p2p_in_invitation = 0;
 381                 }
 382         }
 383 #endif /* CONFIG_P2P */
 384
 385 #ifdef CONFIG_WPS
 386         if (params->freqs == NULL && wpa_s->after_wps && wpa_s->wps_freq) {
 387                 /*
 388                  * Optimize post-provisioning scan based on channel used
 389                  * during provisioning.
 390                  */
 391                 wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Scan only frequency %u MHz "
 392                         "that was used during provisioning", wpa_s->wps_freq);
 393                 params->freqs = os_calloc(2, sizeof(int));
 394                 if (params->freqs)
 395                         params->freqs[0] = wpa_s->wps_freq;
 396                 wpa_s->after_wps--;
 397         } else if (wpa_s->after_wps)
 398                 wpa_s->after_wps--;
 399
 400         if (params->freqs == NULL && wpa_s->known_wps_freq && wpa_s->wps_freq)
 401         {
 402                 /* Optimize provisioning scan based on already known channel */
 403                 wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Scan only frequency %u MHz",
 404                         wpa_s->wps_freq);
 405                 params->freqs = os_calloc(2, sizeof(int));
 406                 if (params->freqs)
 407                         params->freqs[0] = wpa_s->wps_freq;
 408                 wpa_s->known_wps_freq = 0; /* only do this once */
 409         }
 410 #endif /* CONFIG_WPS */
 411 }
 412
 413
 414 #ifdef CONFIG_INTERWORKING
 415 static void wpas_add_interworking_elements(struct wpa_supplicant *wpa_s,
 416                                            struct wpabuf *buf)
 417 {
 418         wpabuf_put_u8(buf, WLAN_EID_INTERWORKING);
 419         wpabuf_put_u8(buf, is_zero_ether_addr(wpa_s->conf->hessid) ? 1 :
 420                       1 + ETH_ALEN);
 421         wpabuf_put_u8(buf, wpa_s->conf->access_network_type);
 422         /* No Venue Info */
 423         if (!is_zero_ether_addr(wpa_s->conf->hessid))
 424                 wpabuf_put_data(buf, wpa_s->conf->hessid, ETH_ALEN);
 425 }
 426 #endif /* CONFIG_INTERWORKING */
 427
 428
 429 void wpa_supplicant_set_default_scan_ies(struct wpa_supplicant *wpa_s)
 430 {
 431         struct wpabuf *default_ies = NULL;
 432         u8 ext_capab[18];
 433         int ext_capab_len;
 434         enum wpa_driver_if_type type = WPA_IF_STATION;
 435
 436 #ifdef CONFIG_P2P
 437         if (wpa_s->p2p_group_interface == P2P_GROUP_INTERFACE_CLIENT)
 438                 type = WPA_IF_P2P_CLIENT;
 439 #endif /* CONFIG_P2P */
 440
 441         wpa_drv_get_ext_capa(wpa_s, type);
 442
 443         ext_capab_len = wpas_build_ext_capab(wpa_s, ext_capab,
 444                                              sizeof(ext_capab));
 445         if (ext_capab_len > 0 &&
 446             wpabuf_resize(&default_ies, ext_capab_len) == 0)
 447                 wpabuf_put_data(default_ies, ext_capab, ext_capab_len);
 448
 449 #ifdef CONFIG_MBO
 450         /* Send cellular capabilities for potential MBO STAs */
 451         if (wpabuf_resize(&default_ies, 9) == 0)
 452                 wpas_mbo_scan_ie(wpa_s, default_ies);
 453 #endif /* CONFIG_MBO */
 454
 455         if (default_ies)
 456                 wpa_drv_set_default_scan_ies(wpa_s, wpabuf_head(default_ies),
 457                                              wpabuf_len(default_ies));
 458         wpabuf_free(default_ies);
 459 }
 460
 461
 462 static struct wpabuf * wpa_supplicant_extra_ies(struct wpa_supplicant *wpa_s)
 463 {
 464         struct wpabuf *extra_ie = NULL;
 465         u8 ext_capab[18];
 466         int ext_capab_len;
 467 #ifdef CONFIG_WPS
 468         int wps = 0;
 469         enum wps_request_type req_type = WPS_REQ_ENROLLEE_INFO;
 470 #endif /* CONFIG_WPS */
 471
 472 #ifdef CONFIG_P2P
 473         if (wpa_s->p2p_group_interface == P2P_GROUP_INTERFACE_CLIENT)
 474                 wpa_drv_get_ext_capa(wpa_s, WPA_IF_P2P_CLIENT);
 475         else
 476 #endif /* CONFIG_P2P */
 477                 wpa_drv_get_ext_capa(wpa_s, WPA_IF_STATION);
 478
 479         ext_capab_len = wpas_build_ext_capab(wpa_s, ext_capab,
 480                                              sizeof(ext_capab));
 481         if (ext_capab_len > 0 &&
 482             wpabuf_resize(&extra_ie, ext_capab_len) == 0)
 483                 wpabuf_put_data(extra_ie, ext_capab, ext_capab_len);
 484
 485 #ifdef CONFIG_INTERWORKING
 486         if (wpa_s->conf->interworking &&
 487             wpabuf_resize(&extra_ie, 100) == 0)
 488                 wpas_add_interworking_elements(wpa_s, extra_ie);
 489 #endif /* CONFIG_INTERWORKING */
 490
 491 #ifdef CONFIG_WPS
 492         wps = wpas_wps_in_use(wpa_s, &req_type);
 493
 494         if (wps) {
 495                 struct wpabuf *wps_ie;
 496                 wps_ie = wps_build_probe_req_ie(wps == 2 ? DEV_PW_PUSHBUTTON :
 497                                                 DEV_PW_DEFAULT,
 498                                                 &wpa_s->wps->dev,
 499                                                 wpa_s->wps->uuid, req_type,
 500                                                 0, NULL);
 501                 if (wps_ie) {
 502                         if (wpabuf_resize(&extra_ie, wpabuf_len(wps_ie)) == 0)
 503                                 wpabuf_put_buf(extra_ie, wps_ie);
 504                         wpabuf_free(wps_ie);
 505                 }
 506         }
 507
 508 #ifdef CONFIG_P2P
 509         if (wps) {
 510                 size_t ielen = p2p_scan_ie_buf_len(wpa_s->global->p2p);
 511                 if (wpabuf_resize(&extra_ie, ielen) == 0)
 512                         wpas_p2p_scan_ie(wpa_s, extra_ie);
 513         }
 514 #endif /* CONFIG_P2P */
 515
 516         wpa_supplicant_mesh_add_scan_ie(wpa_s, &extra_ie);
 517
 518 #endif /* CONFIG_WPS */
 519
 520 #ifdef CONFIG_HS20
 521         if (wpa_s->conf->hs20 && wpabuf_resize(&extra_ie, 7) == 0)
 522                 wpas_hs20_add_indication(extra_ie, -1);
 523 #endif /* CONFIG_HS20 */
 524
 525 #ifdef CONFIG_FST
 526         if (wpa_s->fst_ies &&
 527             wpabuf_resize(&extra_ie, wpabuf_len(wpa_s->fst_ies)) == 0)
 528                 wpabuf_put_buf(extra_ie, wpa_s->fst_ies);
 529 #endif /* CONFIG_FST */
 530
 531 #ifdef CONFIG_MBO
 532         /* Send cellular capabilities for potential MBO STAs */
 533         if (wpabuf_resize(&extra_ie, 9) == 0)
 534                 wpas_mbo_scan_ie(wpa_s, extra_ie);
 535 #endif /* CONFIG_MBO */
 536
 537         if (wpa_s->vendor_elem[VENDOR_ELEM_PROBE_REQ]) {
 538                 struct wpabuf *buf = wpa_s->vendor_elem[VENDOR_ELEM_PROBE_REQ];
 539
 540                 if (wpabuf_resize(&extra_ie, wpabuf_len(buf)) == 0)
 541                         wpabuf_put_buf(extra_ie, buf);
 542         }
 543
 544         return extra_ie;
 545 }
 546
 547
 548 #ifdef CONFIG_P2P
 549
 550 /*
 551  * Check whether there are any enabled networks or credentials that could be
 552  * used for a non-P2P connection.
 553  */
 554 static int non_p2p_network_enabled(struct wpa_supplicant *wpa_s)
 555 {
 556         struct wpa_ssid *ssid;
 557
 558         for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
 559                 if (wpas_network_disabled(wpa_s, ssid))
 560                         continue;
 561                 if (!ssid->p2p_group)
 562                         return 1;
 563         }
 564
 565         if (wpa_s->conf->cred && wpa_s->conf->interworking &&
 566             wpa_s->conf->auto_interworking)
 567                 return 1;
 568
 569         return 0;
 570 }
 571
 572 #endif /* CONFIG_P2P */
 573
 574
 575 static void wpa_setband_scan_freqs_list(struct wpa_supplicant *wpa_s,
 576                                         enum hostapd_hw_mode band,
 577                                         struct wpa_driver_scan_params *params)
 578 {
 579         /* Include only supported channels for the specified band */
 580         struct hostapd_hw_modes *mode;
 581         int count, i;
 582
 583         mode = get_mode(wpa_s->hw.modes, wpa_s->hw.num_modes, band);
 584         if (mode == NULL) {
 585                 /* No channels supported in this band - use empty list */
 586                 params->freqs = os_zalloc(sizeof(int));
 587                 return;
 588         }
 589
 590         params->freqs = os_calloc(mode->num_channels + 1, sizeof(int));
 591         if (params->freqs == NULL)
 592                 return;
 593         for (count = 0, i = 0; i < mode->num_channels; i++) {
 594                 if (mode->channels[i].flag & HOSTAPD_CHAN_DISABLED)
 595                         continue;
 596                 params->freqs[count++] = mode->channels[i].freq;
 597         }
 598 }
 599
 600
 601 static void wpa_setband_scan_freqs(struct wpa_supplicant *wpa_s,
 602                                    struct wpa_driver_scan_params *params)
 603 {
 604         if (wpa_s->hw.modes == NULL)
 605                 return; /* unknown what channels the driver supports */
 606         if (params->freqs)
 607                 return; /* already using a limited channel set */
 608         if (wpa_s->setband == WPA_SETBAND_5G)
 609                 wpa_setband_scan_freqs_list(wpa_s, HOSTAPD_MODE_IEEE80211A,
 610                                             params);
 611         else if (wpa_s->setband == WPA_SETBAND_2G)
 612                 wpa_setband_scan_freqs_list(wpa_s, HOSTAPD_MODE_IEEE80211G,
 613                                             params);
 614 }
 615
 616
 617 static void wpa_set_scan_ssids(struct wpa_supplicant *wpa_s,
 618                                struct wpa_driver_scan_params *params,
 619                                size_t max_ssids)
 620 {
 621         unsigned int i;
 622         struct wpa_ssid *ssid;
 623
 624         /*
 625          * For devices with max_ssids greater than 1, leave the last slot empty
 626          * for adding the wildcard scan entry.
 627          */
 628         max_ssids = max_ssids > 1 ? max_ssids - 1 : max_ssids;
 629
 630         for (i = 0; i < wpa_s->scan_id_count; i++) {
 631                 unsigned int j;
 632
 633                 ssid = wpa_config_get_network(wpa_s->conf, wpa_s->scan_id[i]);
 634                 if (!ssid || !ssid->scan_ssid)
 635                         continue;
 636
 637                 for (j = 0; j < params->num_ssids; j++) {
 638                         if (params->ssids[j].ssid_len == ssid->ssid_len &&
 639                             params->ssids[j].ssid &&
 640                             os_memcmp(params->ssids[j].ssid, ssid->ssid,
 641                                       ssid->ssid_len) == 0)
 642                                 break;
 643                 }
 644                 if (j < params->num_ssids)
 645                         continue; /* already in the list */
 646
 647                 if (params->num_ssids + 1 > max_ssids) {
 648                         wpa_printf(MSG_DEBUG,
 649                                    "Over max scan SSIDs for manual request");
 650                         break;
 651                 }
 652
 653                 wpa_printf(MSG_DEBUG, "Scan SSID (manual request): %s",
 654                            wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
 655                 params->ssids[params->num_ssids].ssid = ssid->ssid;
 656                 params->ssids[params->num_ssids].ssid_len = ssid->ssid_len;
 657                 params->num_ssids++;
 658         }
 659
 660         wpa_s->scan_id_count = 0;
 661 }
 662
 663
 664 static int wpa_set_ssids_from_scan_req(struct wpa_supplicant *wpa_s,
 665                                        struct wpa_driver_scan_params *params,
 666                                        size_t max_ssids)
 667 {
 668         unsigned int i;
 669
 670         if (wpa_s->ssids_from_scan_req == NULL ||
 671             wpa_s->num_ssids_from_scan_req == 0)
 672                 return 0;
 673
 674         if (wpa_s->num_ssids_from_scan_req > max_ssids) {
 675                 wpa_s->num_ssids_from_scan_req = max_ssids;
 676                 wpa_printf(MSG_DEBUG, "Over max scan SSIDs from scan req: %u",
 677                            (unsigned int) max_ssids);
 678         }
 679
 680         for (i = 0; i < wpa_s->num_ssids_from_scan_req; i++) {
 681                 params->ssids[i].ssid = wpa_s->ssids_from_scan_req[i].ssid;
 682                 params->ssids[i].ssid_len =
 683                         wpa_s->ssids_from_scan_req[i].ssid_len;
 684                 wpa_hexdump_ascii(MSG_DEBUG, "specific SSID",
 685                                   params->ssids[i].ssid,
 686                                   params->ssids[i].ssid_len);
 687         }
 688
 689         params->num_ssids = wpa_s->num_ssids_from_scan_req;
 690         wpa_s->num_ssids_from_scan_req = 0;
 691         return 1;
 692 }
 693
 694
 695 static void wpa_supplicant_scan(void *eloop_ctx, void *timeout_ctx)
 696 {
 697         struct wpa_supplicant *wpa_s = eloop_ctx;
 698         struct wpa_ssid *ssid;
 699         int ret, p2p_in_prog;
 700         struct wpabuf *extra_ie = NULL;
 701         struct wpa_driver_scan_params params;
 702         struct wpa_driver_scan_params *scan_params;
 703         size_t max_ssids;
 704         int connect_without_scan = 0;
 705
 706         if (wpa_s->pno || wpa_s->pno_sched_pending) {
 707                 wpa_dbg(wpa_s, MSG_DEBUG, "Skip scan - PNO is in progress");
 708                 return;
 709         }
 710
 711         if (wpa_s->wpa_state == WPA_INTERFACE_DISABLED) {
 712                 wpa_dbg(wpa_s, MSG_DEBUG, "Skip scan - interface disabled");
 713                 return;
 714         }
 715
 716         if (wpa_s->disconnected && wpa_s->scan_req == NORMAL_SCAN_REQ) {
 717                 wpa_dbg(wpa_s, MSG_DEBUG, "Disconnected - do not scan");
 718                 wpa_supplicant_set_state(wpa_s, WPA_DISCONNECTED);
 719                 return;
 720         }
 721
 722         if (wpa_s->scanning) {
 723                 /*
 724                  * If we are already in scanning state, we shall reschedule the
 725                  * the incoming scan request.
 726                  */
 727                 wpa_dbg(wpa_s, MSG_DEBUG, "Already scanning - Reschedule the incoming scan req");
 728                 wpa_supplicant_req_scan(wpa_s, 1, 0);
 729                 return;
 730         }
 731
 732         if (!wpa_supplicant_enabled_networks(wpa_s) &&
 733             wpa_s->scan_req == NORMAL_SCAN_REQ) {
 734                 wpa_dbg(wpa_s, MSG_DEBUG, "No enabled networks - do not scan");
 735                 wpa_supplicant_set_state(wpa_s, WPA_INACTIVE);
 736                 return;
 737         }
 738
 739         if (wpa_s->conf->ap_scan != 0 &&
 740             (wpa_s->drv_flags & WPA_DRIVER_FLAGS_WIRED)) {
 741                 wpa_dbg(wpa_s, MSG_DEBUG, "Using wired authentication - "
 742                         "overriding ap_scan configuration");
 743                 wpa_s->conf->ap_scan = 0;
 744                 wpas_notify_ap_scan_changed(wpa_s);
 745         }
 746
 747         if (wpa_s->conf->ap_scan == 0) {
 748                 wpa_supplicant_gen_assoc_event(wpa_s);
 749                 return;
 750         }
 751
 752         ssid = NULL;
 753         if (wpa_s->scan_req != MANUAL_SCAN_REQ &&
 754             wpa_s->connect_without_scan) {
 755                 connect_without_scan = 1;
 756                 for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
 757                         if (ssid == wpa_s->connect_without_scan)
 758                                 break;
 759                 }
 760         }
 761
 762         p2p_in_prog = wpas_p2p_in_progress(wpa_s);
 763         if (p2p_in_prog && p2p_in_prog != 2 &&
 764             (!ssid ||
 765              (ssid->mode != WPAS_MODE_AP && ssid->mode != WPAS_MODE_P2P_GO))) {
 766                 wpa_dbg(wpa_s, MSG_DEBUG, "Delay station mode scan while P2P operation is in progress");
 767                 wpa_supplicant_req_scan(wpa_s, 5, 0);
 768                 return;
 769         }
 770
 771         if (wpa_s->conf->ap_scan == 2)
 772                 max_ssids = 1;
 773         else {
 774                 max_ssids = wpa_s->max_scan_ssids;
 775                 if (max_ssids > WPAS_MAX_SCAN_SSIDS)
 776                         max_ssids = WPAS_MAX_SCAN_SSIDS;
 777         }
 778
 779         wpa_s->last_scan_req = wpa_s->scan_req;
 780         wpa_s->scan_req = NORMAL_SCAN_REQ;
 781
 782         if (connect_without_scan) {
 783                 wpa_s->connect_without_scan = NULL;
 784                 if (ssid) {
 785                         wpa_printf(MSG_DEBUG, "Start a pre-selected network "
 786                                    "without scan step");
 787                         wpa_supplicant_associate(wpa_s, NULL, ssid);
 788                         return;
 789                 }
 790         }
 791
 792         os_memset(&params, 0, sizeof(params));
 793
 794         wpa_s->scan_prev_wpa_state = wpa_s->wpa_state;
 795         if (wpa_s->wpa_state == WPA_DISCONNECTED ||
 796             wpa_s->wpa_state == WPA_INACTIVE)
 797                 wpa_supplicant_set_state(wpa_s, WPA_SCANNING);
 798
 799         /*
 800          * If autoscan has set its own scanning parameters
 801          */
 802         if (wpa_s->autoscan_params != NULL) {
 803                 scan_params = wpa_s->autoscan_params;
 804                 goto scan;
 805         }
 806
 807         if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
 808             wpa_set_ssids_from_scan_req(wpa_s, &params, max_ssids)) {
 809                 wpa_printf(MSG_DEBUG, "Use specific SSIDs from SCAN command");
 810                 goto ssid_list_set;
 811         }
 812
 813 #ifdef CONFIG_P2P
 814         if ((wpa_s->p2p_in_provisioning || wpa_s->show_group_started) &&
 815             wpa_s->go_params && !wpa_s->conf->passive_scan) {
 816                 wpa_printf(MSG_DEBUG, "P2P: Use specific SSID for scan during P2P group formation (p2p_in_provisioning=%d show_group_started=%d)",
 817                            wpa_s->p2p_in_provisioning,
 818                            wpa_s->show_group_started);
 819                 params.ssids[0].ssid = wpa_s->go_params->ssid;
 820                 params.ssids[0].ssid_len = wpa_s->go_params->ssid_len;
 821                 params.num_ssids = 1;
 822                 goto ssid_list_set;
 823         }
 824
 825         if (wpa_s->p2p_in_invitation) {
 826                 if (wpa_s->current_ssid) {
 827                         wpa_printf(MSG_DEBUG, "P2P: Use specific SSID for scan during invitation");
 828                         params.ssids[0].ssid = wpa_s->current_ssid->ssid;
 829                         params.ssids[0].ssid_len =
 830                                 wpa_s->current_ssid->ssid_len;
 831                         params.num_ssids = 1;
 832                 } else {
 833                         wpa_printf(MSG_DEBUG, "P2P: No specific SSID known for scan during invitation");
 834                 }
 835                 goto ssid_list_set;
 836         }
 837 #endif /* CONFIG_P2P */
 838
 839         /* Find the starting point from which to continue scanning */
 840         ssid = wpa_s->conf->ssid;
 841         if (wpa_s->prev_scan_ssid != WILDCARD_SSID_SCAN) {
 842                 while (ssid) {
 843                         if (ssid == wpa_s->prev_scan_ssid) {
 844                                 ssid = ssid->next;
 845                                 break;
 846                         }
 847                         ssid = ssid->next;
 848                 }
 849         }
 850
 851         if (wpa_s->last_scan_req != MANUAL_SCAN_REQ &&
 852 #ifdef CONFIG_AP
 853             !wpa_s->ap_iface &&
 854 #endif /* CONFIG_AP */
 855             wpa_s->conf->ap_scan == 2) {
 856                 wpa_s->connect_without_scan = NULL;
 857                 wpa_s->prev_scan_wildcard = 0;
 858                 wpa_supplicant_assoc_try(wpa_s, ssid);
 859                 return;
 860         } else if (wpa_s->conf->ap_scan == 2) {
 861                 /*
 862                  * User-initiated scan request in ap_scan == 2; scan with
 863                  * wildcard SSID.
 864                  */
 865                 ssid = NULL;
 866         } else if (wpa_s->reattach && wpa_s->current_ssid != NULL) {
 867                 /*
 868                  * Perform single-channel single-SSID scan for
 869                  * reassociate-to-same-BSS operation.
 870                  */
 871                 /* Setup SSID */
 872                 ssid = wpa_s->current_ssid;
 873                 wpa_hexdump_ascii(MSG_DEBUG, "Scan SSID",
 874                                   ssid->ssid, ssid->ssid_len);
 875                 params.ssids[0].ssid = ssid->ssid;
 876                 params.ssids[0].ssid_len = ssid->ssid_len;
 877                 params.num_ssids = 1;
 878
 879                 /*
 880                  * Allocate memory for frequency array, allocate one extra
 881                  * slot for the zero-terminator.
 882                  */
 883                 params.freqs = os_malloc(sizeof(int) * 2);
 884                 if (params.freqs) {
 885                         params.freqs[0] = wpa_s->assoc_freq;
 886                         params.freqs[1] = 0;
 887                 }
 888
 889                 /*
 890                  * Reset the reattach flag so that we fall back to full scan if
 891                  * this scan fails.
 892                  */
 893                 wpa_s->reattach = 0;
 894         } else {
 895                 struct wpa_ssid *start = ssid, *tssid;
 896                 int freqs_set = 0;
 897                 if (ssid == NULL && max_ssids > 1)
 898                         ssid = wpa_s->conf->ssid;
 899                 while (ssid) {
 900                         if (!wpas_network_disabled(wpa_s, ssid) &&
 901                             ssid->scan_ssid) {
 902                                 wpa_hexdump_ascii(MSG_DEBUG, "Scan SSID",
 903                                                   ssid->ssid, ssid->ssid_len);
 904                                 params.ssids[params.num_ssids].ssid =
 905                                         ssid->ssid;
 906                                 params.ssids[params.num_ssids].ssid_len =
 907                                         ssid->ssid_len;
 908                                 params.num_ssids++;
 909                                 if (params.num_ssids + 1 >= max_ssids)
 910                                         break;
 911                         }
 912                         ssid = ssid->next;
 913                         if (ssid == start)
 914                                 break;
 915                         if (ssid == NULL && max_ssids > 1 &&
 916                             start != wpa_s->conf->ssid)
 917                                 ssid = wpa_s->conf->ssid;
 918                 }
 919
 920                 if (wpa_s->scan_id_count &&
 921                     wpa_s->last_scan_req == MANUAL_SCAN_REQ)
 922                         wpa_set_scan_ssids(wpa_s, &params, max_ssids);
 923
 924                 for (tssid = wpa_s->conf->ssid;
 925                      wpa_s->last_scan_req != MANUAL_SCAN_REQ && tssid;
 926                      tssid = tssid->next) {
 927                         if (wpas_network_disabled(wpa_s, tssid))
 928                                 continue;
 929                         if ((params.freqs || !freqs_set) && tssid->scan_freq) {
 930                                 int_array_concat(&params.freqs,
 931                                                  tssid->scan_freq);
 932                         } else {
 933                                 os_free(params.freqs);
 934                                 params.freqs = NULL;
 935                         }
 936                         freqs_set = 1;
 937                 }
 938                 int_array_sort_unique(params.freqs);
 939         }
 940
 941         if (ssid && max_ssids == 1) {
 942                 /*
 943                  * If the driver is limited to 1 SSID at a time interleave
 944                  * wildcard SSID scans with specific SSID scans to avoid
 945                  * waiting a long time for a wildcard scan.
 946                  */
 947                 if (!wpa_s->prev_scan_wildcard) {
 948                         params.ssids[0].ssid = NULL;
 949                         params.ssids[0].ssid_len = 0;
 950                         wpa_s->prev_scan_wildcard = 1;
 951                         wpa_dbg(wpa_s, MSG_DEBUG, "Starting AP scan for "
 952                                 "wildcard SSID (Interleave with specific)");
 953                 } else {
 954                         wpa_s->prev_scan_ssid = ssid;
 955                         wpa_s->prev_scan_wildcard = 0;
 956                         wpa_dbg(wpa_s, MSG_DEBUG,
 957                                 "Starting AP scan for specific SSID: %s",
 958                                 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
 959                 }
 960         } else if (ssid) {
 961                 /* max_ssids > 1 */
 962
 963                 wpa_s->prev_scan_ssid = ssid;
 964                 wpa_dbg(wpa_s, MSG_DEBUG, "Include wildcard SSID in "
 965                         "the scan request");
 966                 params.num_ssids++;
 967         } else if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
 968                    wpa_s->manual_scan_passive && params.num_ssids == 0) {
 969                 wpa_dbg(wpa_s, MSG_DEBUG, "Use passive scan based on manual request");
 970         } else if (wpa_s->conf->passive_scan) {
 971                 wpa_dbg(wpa_s, MSG_DEBUG,
 972                         "Use passive scan based on configuration");
 973         } else {
 974                 wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
 975                 params.num_ssids++;
 976                 wpa_dbg(wpa_s, MSG_DEBUG, "Starting AP scan for wildcard "
 977                         "SSID");
 978         }
 979
 980 ssid_list_set:
 981         wpa_supplicant_optimize_freqs(wpa_s, &params);
 982         extra_ie = wpa_supplicant_extra_ies(wpa_s);
 983
 984         if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
 985             wpa_s->manual_scan_only_new) {
 986                 wpa_printf(MSG_DEBUG,
 987                            "Request driver to clear scan cache due to manual only_new=1 scan");
 988                 params.only_new_results = 1;
 989         }
 990
 991         if (wpa_s->last_scan_req == MANUAL_SCAN_REQ && params.freqs == NULL &&
 992             wpa_s->manual_scan_freqs) {
 993                 wpa_dbg(wpa_s, MSG_DEBUG, "Limit manual scan to specified channels");
 994                 params.freqs = wpa_s->manual_scan_freqs;
 995                 wpa_s->manual_scan_freqs = NULL;
 996         }
 997
 998         if (params.freqs == NULL && wpa_s->next_scan_freqs) {
 999                 wpa_dbg(wpa_s, MSG_DEBUG, "Optimize scan based on previously "
1000                         "generated frequency list");
1001                 params.freqs = wpa_s->next_scan_freqs;
1002         } else
1003                 os_free(wpa_s->next_scan_freqs);
1004         wpa_s->next_scan_freqs = NULL;
1005         wpa_setband_scan_freqs(wpa_s, &params);
1006
1007         /* See if user specified frequencies. If so, scan only those. */
1008         if (wpa_s->conf->freq_list && !params.freqs) {
1009                 wpa_dbg(wpa_s, MSG_DEBUG,
1010                         "Optimize scan based on conf->freq_list");
1011                 int_array_concat(&params.freqs, wpa_s->conf->freq_list);
1012         }
1013
1014         /* Use current associated channel? */
1015         if (wpa_s->conf->scan_cur_freq && !params.freqs) {
1016                 unsigned int num = wpa_s->num_multichan_concurrent;
1017
1018                 params.freqs = os_calloc(num + 1, sizeof(int));
1019                 if (params.freqs) {
1020                         num = get_shared_radio_freqs(wpa_s, params.freqs, num);
1021                         if (num > 0) {
1022                                 wpa_dbg(wpa_s, MSG_DEBUG, "Scan only the "
1023                                         "current operating channels since "
1024                                         "scan_cur_freq is enabled");
1025                         } else {
1026                                 os_free(params.freqs);
1027                                 params.freqs = NULL;
1028                         }
1029                 }
1030         }
1031
1032         params.filter_ssids = wpa_supplicant_build_filter_ssids(
1033                 wpa_s->conf, &params.num_filter_ssids);
1034         if (extra_ie) {
1035                 params.extra_ies = wpabuf_head(extra_ie);
1036                 params.extra_ies_len = wpabuf_len(extra_ie);
1037         }
1038
1039 #ifdef CONFIG_P2P
1040         if (wpa_s->p2p_in_provisioning || wpa_s->p2p_in_invitation ||
1041             (wpa_s->show_group_started && wpa_s->go_params)) {
1042                 /*
1043                  * The interface may not yet be in P2P mode, so we have to
1044                  * explicitly request P2P probe to disable CCK rates.
1045                  */
1046                 params.p2p_probe = 1;
1047         }
1048 #endif /* CONFIG_P2P */
1049
1050         if (wpa_s->mac_addr_rand_enable & MAC_ADDR_RAND_SCAN) {
1051                 params.mac_addr_rand = 1;
1052                 if (wpa_s->mac_addr_scan) {
1053                         params.mac_addr = wpa_s->mac_addr_scan;
1054                         params.mac_addr_mask = wpa_s->mac_addr_scan + ETH_ALEN;
1055                 }
1056         }
1057
1058         if (!is_zero_ether_addr(wpa_s->next_scan_bssid)) {
1059                 struct wpa_bss *bss;
1060
1061                 params.bssid = wpa_s->next_scan_bssid;
1062                 bss = wpa_bss_get_bssid_latest(wpa_s, params.bssid);
1063                 if (bss && bss->ssid_len && params.num_ssids == 1 &&
1064                     params.ssids[0].ssid_len == 0) {
1065                         params.ssids[0].ssid = bss->ssid;
1066                         params.ssids[0].ssid_len = bss->ssid_len;
1067                         wpa_dbg(wpa_s, MSG_DEBUG,
1068                                 "Scan a previously specified BSSID " MACSTR
1069                                 " and SSID %s",
1070                                 MAC2STR(params.bssid),
1071                                 wpa_ssid_txt(bss->ssid, bss->ssid_len));
1072                 } else {
1073                         wpa_dbg(wpa_s, MSG_DEBUG,
1074                                 "Scan a previously specified BSSID " MACSTR,
1075                                 MAC2STR(params.bssid));
1076                 }
1077         }
1078
1079         scan_params = &params;
1080
1081 scan:
1082 #ifdef CONFIG_P2P
1083         /*
1084          * If the driver does not support multi-channel concurrency and a
1085          * virtual interface that shares the same radio with the wpa_s interface
1086          * is operating there may not be need to scan other channels apart from
1087          * the current operating channel on the other virtual interface. Filter
1088          * out other channels in case we are trying to find a connection for a
1089          * station interface when we are not configured to prefer station
1090          * connection and a concurrent operation is already in process.
1091          */
1092         if (wpa_s->scan_for_connection &&
1093             wpa_s->last_scan_req == NORMAL_SCAN_REQ &&
1094             !scan_params->freqs && !params.freqs &&
1095             wpas_is_p2p_prioritized(wpa_s) &&
1096             wpa_s->p2p_group_interface == NOT_P2P_GROUP_INTERFACE &&
1097             non_p2p_network_enabled(wpa_s)) {
1098                 unsigned int num = wpa_s->num_multichan_concurrent;
1099
1100                 params.freqs = os_calloc(num + 1, sizeof(int));
1101                 if (params.freqs) {
1102                         num = get_shared_radio_freqs(wpa_s, params.freqs, num);
1103                         if (num > 0 && num == wpa_s->num_multichan_concurrent) {
1104                                 wpa_dbg(wpa_s, MSG_DEBUG, "Scan only the current operating channels since all channels are already used");
1105                         } else {
1106                                 os_free(params.freqs);
1107                                 params.freqs = NULL;
1108                         }
1109                 }
1110         }
1111 #endif /* CONFIG_P2P */
1112
1113         ret = wpa_supplicant_trigger_scan(wpa_s, scan_params);
1114
1115         if (ret && wpa_s->last_scan_req == MANUAL_SCAN_REQ && params.freqs &&
1116             !wpa_s->manual_scan_freqs) {
1117                 /* Restore manual_scan_freqs for the next attempt */
1118                 wpa_s->manual_scan_freqs = params.freqs;
1119                 params.freqs = NULL;
1120         }
1121
1122         wpabuf_free(extra_ie);
1123         os_free(params.freqs);
1124         os_free(params.filter_ssids);
1125
1126         if (ret) {
1127                 wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate AP scan");
1128                 if (wpa_s->scan_prev_wpa_state != wpa_s->wpa_state)
1129                         wpa_supplicant_set_state(wpa_s,
1130                                                  wpa_s->scan_prev_wpa_state);
1131                 /* Restore scan_req since we will try to scan again */
1132                 wpa_s->scan_req = wpa_s->last_scan_req;
1133                 wpa_supplicant_req_scan(wpa_s, 1, 0);
1134         } else {
1135                 wpa_s->scan_for_connection = 0;
1136 #ifdef CONFIG_INTERWORKING
1137                 wpa_s->interworking_fast_assoc_tried = 0;
1138 #endif /* CONFIG_INTERWORKING */
1139                 if (params.bssid)
1140                         os_memset(wpa_s->next_scan_bssid, 0, ETH_ALEN);
1141         }
1142 }
1143
1144
1145 void wpa_supplicant_update_scan_int(struct wpa_supplicant *wpa_s, int sec)
1146 {
1147         struct os_reltime remaining, new_int;
1148         int cancelled;
1149
1150         cancelled = eloop_cancel_timeout_one(wpa_supplicant_scan, wpa_s, NULL,
1151                                              &remaining);
1152
1153         new_int.sec = sec;
1154         new_int.usec = 0;
1155         if (cancelled && os_reltime_before(&remaining, &new_int)) {
1156                 new_int.sec = remaining.sec;
1157                 new_int.usec = remaining.usec;
1158         }
1159
1160         if (cancelled) {
1161                 eloop_register_timeout(new_int.sec, new_int.usec,
1162                                        wpa_supplicant_scan, wpa_s, NULL);
1163         }
1164         wpa_s->scan_interval = sec;
1165 }
1166
1167
1168 /**
1169  * wpa_supplicant_req_scan - Schedule a scan for neighboring access points
1170  * @wpa_s: Pointer to wpa_supplicant data
1171  * @sec: Number of seconds after which to scan
1172  * @usec: Number of microseconds after which to scan
1173  *
1174  * This function is used to schedule a scan for neighboring access points after
1175  * the specified time.
1176  */
1177 void wpa_supplicant_req_scan(struct wpa_supplicant *wpa_s, int sec, int usec)
1178 {
1179         int res;
1180
1181         if (wpa_s->p2p_mgmt) {
1182                 wpa_dbg(wpa_s, MSG_DEBUG,
1183                         "Ignore scan request (%d.%06d sec) on p2p_mgmt interface",
1184                         sec, usec);
1185                 return;
1186         }
1187
1188         res = eloop_deplete_timeout(sec, usec, wpa_supplicant_scan, wpa_s,
1189                                     NULL);
1190         if (res == 1) {
1191                 wpa_dbg(wpa_s, MSG_DEBUG, "Rescheduling scan request: %d.%06d sec",
1192                         sec, usec);
1193         } else if (res == 0) {
1194                 wpa_dbg(wpa_s, MSG_DEBUG, "Ignore new scan request for %d.%06d sec since an earlier request is scheduled to trigger sooner",
1195                         sec, usec);
1196         } else {
1197                 wpa_dbg(wpa_s, MSG_DEBUG, "Setting scan request: %d.%06d sec",
1198                         sec, usec);
1199                 eloop_register_timeout(sec, usec, wpa_supplicant_scan, wpa_s, NULL);
1200         }
1201 }
1202
1203
1204 /**
1205  * wpa_supplicant_delayed_sched_scan - Request a delayed scheduled scan
1206  * @wpa_s: Pointer to wpa_supplicant data
1207  * @sec: Number of seconds after which to scan
1208  * @usec: Number of microseconds after which to scan
1209  * Returns: 0 on success or -1 otherwise
1210  *
1211  * This function is used to schedule periodic scans for neighboring
1212  * access points after the specified time.
1213  */
1214 int wpa_supplicant_delayed_sched_scan(struct wpa_supplicant *wpa_s,
1215                                       int sec, int usec)
1216 {
1217         if (!wpa_s->sched_scan_supported)
1218                 return -1;
1219
1220         eloop_register_timeout(sec, usec,
1221                                wpa_supplicant_delayed_sched_scan_timeout,
1222                                wpa_s, NULL);
1223
1224         return 0;
1225 }
1226
1227
1228 /**
1229  * wpa_supplicant_req_sched_scan - Start a periodic scheduled scan
1230  * @wpa_s: Pointer to wpa_supplicant data
1231  * Returns: 0 is sched_scan was started or -1 otherwise
1232  *
1233  * This function is used to schedule periodic scans for neighboring
1234  * access points repeating the scan continuously.
1235  */
1236 int wpa_supplicant_req_sched_scan(struct wpa_supplicant *wpa_s)
1237 {
1238         struct wpa_driver_scan_params params;
1239         struct wpa_driver_scan_params *scan_params;
1240         enum wpa_states prev_state;
1241         struct wpa_ssid *ssid = NULL;
1242         struct wpabuf *extra_ie = NULL;
1243         int ret;
1244         unsigned int max_sched_scan_ssids;
1245         int wildcard = 0;
1246         int need_ssids;
1247         struct sched_scan_plan scan_plan;
1248
1249         if (!wpa_s->sched_scan_supported)
1250                 return -1;
1251
1252         if (wpa_s->max_sched_scan_ssids > WPAS_MAX_SCAN_SSIDS)
1253                 max_sched_scan_ssids = WPAS_MAX_SCAN_SSIDS;
1254         else
1255                 max_sched_scan_ssids = wpa_s->max_sched_scan_ssids;
1256         if (max_sched_scan_ssids < 1 || wpa_s->conf->disable_scan_offload)
1257                 return -1;
1258
1259         if (wpa_s->sched_scanning) {
1260                 wpa_dbg(wpa_s, MSG_DEBUG, "Already sched scanning");
1261                 return 0;
1262         }
1263
1264         need_ssids = 0;
1265         for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
1266                 if (!wpas_network_disabled(wpa_s, ssid) && !ssid->scan_ssid) {
1267                         /* Use wildcard SSID to find this network */
1268                         wildcard = 1;
1269                 } else if (!wpas_network_disabled(wpa_s, ssid) &&
1270                            ssid->ssid_len)
1271                         need_ssids++;
1272
1273 #ifdef CONFIG_WPS
1274                 if (!wpas_network_disabled(wpa_s, ssid) &&
1275                     ssid->key_mgmt == WPA_KEY_MGMT_WPS) {
1276                         /*
1277                          * Normal scan is more reliable and faster for WPS
1278                          * operations and since these are for short periods of
1279                          * time, the benefit of trying to use sched_scan would
1280                          * be limited.
1281                          */
1282                         wpa_dbg(wpa_s, MSG_DEBUG, "Use normal scan instead of "
1283                                 "sched_scan for WPS");
1284                         return -1;
1285                 }
1286 #endif /* CONFIG_WPS */
1287         }
1288         if (wildcard)
1289                 need_ssids++;
1290
1291         if (wpa_s->normal_scans < 3 &&
1292             (need_ssids <= wpa_s->max_scan_ssids ||
1293              wpa_s->max_scan_ssids >= (int) max_sched_scan_ssids)) {
1294                 /*
1295                  * When normal scan can speed up operations, use that for the
1296                  * first operations before starting the sched_scan to allow
1297                  * user space sleep more. We do this only if the normal scan
1298                  * has functionality that is suitable for this or if the
1299                  * sched_scan does not have better support for multiple SSIDs.
1300                  */
1301                 wpa_dbg(wpa_s, MSG_DEBUG, "Use normal scan instead of "
1302                         "sched_scan for initial scans (normal_scans=%d)",
1303                         wpa_s->normal_scans);
1304                 return -1;
1305         }
1306
1307         os_memset(&params, 0, sizeof(params));
1308
1309         /* If we can't allocate space for the filters, we just don't filter */
1310         params.filter_ssids = os_calloc(wpa_s->max_match_sets,
1311                                         sizeof(struct wpa_driver_scan_filter));
1312
1313         prev_state = wpa_s->wpa_state;
1314         if (wpa_s->wpa_state == WPA_DISCONNECTED ||
1315             wpa_s->wpa_state == WPA_INACTIVE)
1316                 wpa_supplicant_set_state(wpa_s, WPA_SCANNING);
1317
1318         if (wpa_s->autoscan_params != NULL) {
1319                 scan_params = wpa_s->autoscan_params;
1320                 goto scan;
1321         }
1322
1323         /* Find the starting point from which to continue scanning */
1324         ssid = wpa_s->conf->ssid;
1325         if (wpa_s->prev_sched_ssid) {
1326                 while (ssid) {
1327                         if (ssid == wpa_s->prev_sched_ssid) {
1328                                 ssid = ssid->next;
1329                                 break;
1330                         }
1331                         ssid = ssid->next;
1332                 }
1333         }
1334
1335         if (!ssid || !wpa_s->prev_sched_ssid) {
1336                 wpa_dbg(wpa_s, MSG_DEBUG, "Beginning of SSID list");
1337                 wpa_s->sched_scan_timeout = max_sched_scan_ssids * 2;
1338                 wpa_s->first_sched_scan = 1;
1339                 ssid = wpa_s->conf->ssid;
1340                 wpa_s->prev_sched_ssid = ssid;
1341         }
1342
1343         if (wildcard) {
1344                 wpa_dbg(wpa_s, MSG_DEBUG, "Add wildcard SSID to sched_scan");
1345                 params.num_ssids++;
1346         }
1347
1348         while (ssid) {
1349                 if (wpas_network_disabled(wpa_s, ssid))
1350                         goto next;
1351
1352                 if (params.num_filter_ssids < wpa_s->max_match_sets &&
1353                     params.filter_ssids && ssid->ssid && ssid->ssid_len) {
1354                         wpa_dbg(wpa_s, MSG_DEBUG, "add to filter ssid: %s",
1355                                 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
1356                         os_memcpy(params.filter_ssids[params.num_filter_ssids].ssid,
1357                                   ssid->ssid, ssid->ssid_len);
1358                         params.filter_ssids[params.num_filter_ssids].ssid_len =
1359                                 ssid->ssid_len;
1360                         params.num_filter_ssids++;
1361                 } else if (params.filter_ssids && ssid->ssid && ssid->ssid_len)
1362                 {
1363                         wpa_dbg(wpa_s, MSG_DEBUG, "Not enough room for SSID "
1364                                 "filter for sched_scan - drop filter");
1365                         os_free(params.filter_ssids);
1366                         params.filter_ssids = NULL;
1367                         params.num_filter_ssids = 0;
1368                 }
1369
1370                 if (ssid->scan_ssid && ssid->ssid && ssid->ssid_len) {
1371                         if (params.num_ssids == max_sched_scan_ssids)
1372                                 break; /* only room for broadcast SSID */
1373                         wpa_dbg(wpa_s, MSG_DEBUG,
1374                                 "add to active scan ssid: %s",
1375                                 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
1376                         params.ssids[params.num_ssids].ssid =
1377                                 ssid->ssid;
1378                         params.ssids[params.num_ssids].ssid_len =
1379                                 ssid->ssid_len;
1380                         params.num_ssids++;
1381                         if (params.num_ssids >= max_sched_scan_ssids) {
1382                                 wpa_s->prev_sched_ssid = ssid;
1383                                 do {
1384                                         ssid = ssid->next;
1385                                 } while (ssid &&
1386                                          (wpas_network_disabled(wpa_s, ssid) ||
1387                                           !ssid->scan_ssid));
1388                                 break;
1389                         }
1390                 }
1391
1392         next:
1393                 wpa_s->prev_sched_ssid = ssid;
1394                 ssid = ssid->next;
1395         }
1396
1397         if (params.num_filter_ssids == 0) {
1398                 os_free(params.filter_ssids);
1399                 params.filter_ssids = NULL;
1400         }
1401
1402         extra_ie = wpa_supplicant_extra_ies(wpa_s);
1403         if (extra_ie) {
1404                 params.extra_ies = wpabuf_head(extra_ie);
1405                 params.extra_ies_len = wpabuf_len(extra_ie);
1406         }
1407
1408         if (wpa_s->conf->filter_rssi)
1409                 params.filter_rssi = wpa_s->conf->filter_rssi;
1410
1411         /* See if user specified frequencies. If so, scan only those. */
1412         if (wpa_s->conf->freq_list && !params.freqs) {
1413                 wpa_dbg(wpa_s, MSG_DEBUG,
1414                         "Optimize scan based on conf->freq_list");
1415                 int_array_concat(&params.freqs, wpa_s->conf->freq_list);
1416         }
1417
1418         scan_params = &params;
1419
1420 scan:
1421         wpa_s->sched_scan_timed_out = 0;
1422
1423         /*
1424          * We cannot support multiple scan plans if the scan request includes
1425          * too many SSID's, so in this case use only the last scan plan and make
1426          * it run infinitely. It will be stopped by the timeout.
1427          */
1428         if (wpa_s->sched_scan_plans_num == 1 ||
1429             (wpa_s->sched_scan_plans_num && !ssid && wpa_s->first_sched_scan)) {
1430                 params.sched_scan_plans = wpa_s->sched_scan_plans;
1431                 params.sched_scan_plans_num = wpa_s->sched_scan_plans_num;
1432         } else if (wpa_s->sched_scan_plans_num > 1) {
1433                 wpa_dbg(wpa_s, MSG_DEBUG,
1434                         "Too many SSIDs. Default to using single scheduled_scan plan");
1435                 params.sched_scan_plans =
1436                         &wpa_s->sched_scan_plans[wpa_s->sched_scan_plans_num -
1437                                                  1];
1438                 params.sched_scan_plans_num = 1;
1439         } else {
1440                 if (wpa_s->conf->sched_scan_interval)
1441                         scan_plan.interval = wpa_s->conf->sched_scan_interval;
1442                 else
1443                         scan_plan.interval = 10;
1444
1445                 if (scan_plan.interval > wpa_s->max_sched_scan_plan_interval) {
1446                         wpa_printf(MSG_WARNING,
1447                                    "Scan interval too long(%u), use the maximum allowed(%u)",
1448                                    scan_plan.interval,
1449                                    wpa_s->max_sched_scan_plan_interval);
1450                         scan_plan.interval =
1451                                 wpa_s->max_sched_scan_plan_interval;
1452                 }
1453
1454                 scan_plan.iterations = 0;
1455                 params.sched_scan_plans = &scan_plan;
1456                 params.sched_scan_plans_num = 1;
1457         }
1458
1459         if (ssid || !wpa_s->first_sched_scan) {
1460                 wpa_dbg(wpa_s, MSG_DEBUG,
1461                         "Starting sched scan: interval %u timeout %d",
1462                         params.sched_scan_plans[0].interval,
1463                         wpa_s->sched_scan_timeout);
1464         } else {
1465                 wpa_dbg(wpa_s, MSG_DEBUG, "Starting sched scan (no timeout)");
1466         }
1467
1468         wpa_setband_scan_freqs(wpa_s, scan_params);
1469
1470         if (wpa_s->mac_addr_rand_enable & MAC_ADDR_RAND_SCHED_SCAN) {
1471                 params.mac_addr_rand = 1;
1472                 if (wpa_s->mac_addr_sched_scan) {
1473                         params.mac_addr = wpa_s->mac_addr_sched_scan;
1474                         params.mac_addr_mask = wpa_s->mac_addr_sched_scan +
1475                                 ETH_ALEN;
1476                 }
1477         }
1478
1479         ret = wpa_supplicant_start_sched_scan(wpa_s, scan_params);
1480         wpabuf_free(extra_ie);
1481         os_free(params.filter_ssids);
1482         if (ret) {
1483                 wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate sched scan");
1484                 if (prev_state != wpa_s->wpa_state)
1485                         wpa_supplicant_set_state(wpa_s, prev_state);
1486                 return ret;
1487         }
1488
1489         /* If we have more SSIDs to scan, add a timeout so we scan them too */
1490         if (ssid || !wpa_s->first_sched_scan) {
1491                 wpa_s->sched_scan_timed_out = 0;
1492                 eloop_register_timeout(wpa_s->sched_scan_timeout, 0,
1493                                        wpa_supplicant_sched_scan_timeout,
1494                                        wpa_s, NULL);
1495                 wpa_s->first_sched_scan = 0;
1496                 wpa_s->sched_scan_timeout /= 2;
1497                 params.sched_scan_plans[0].interval *= 2;
1498                 if ((unsigned int) wpa_s->sched_scan_timeout <
1499                     params.sched_scan_plans[0].interval ||
1500                     params.sched_scan_plans[0].interval >
1501                     wpa_s->max_sched_scan_plan_interval) {
1502                         params.sched_scan_plans[0].interval = 10;
1503                         wpa_s->sched_scan_timeout = max_sched_scan_ssids * 2;
1504                 }
1505         }
1506
1507         /* If there is no more ssids, start next time from the beginning */
1508         if (!ssid)
1509                 wpa_s->prev_sched_ssid = NULL;
1510
1511         return 0;
1512 }
1513
1514
1515 /**
1516  * wpa_supplicant_cancel_scan - Cancel a scheduled scan request
1517  * @wpa_s: Pointer to wpa_supplicant data
1518  *
1519  * This function is used to cancel a scan request scheduled with
1520  * wpa_supplicant_req_scan().
1521  */
1522 void wpa_supplicant_cancel_scan(struct wpa_supplicant *wpa_s)
1523 {
1524         wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling scan request");
1525         eloop_cancel_timeout(wpa_supplicant_scan, wpa_s, NULL);
1526 }
1527
1528
1529 /**
1530  * wpa_supplicant_cancel_delayed_sched_scan - Stop a delayed scheduled scan
1531  * @wpa_s: Pointer to wpa_supplicant data
1532  *
1533  * This function is used to stop a delayed scheduled scan.
1534  */
1535 void wpa_supplicant_cancel_delayed_sched_scan(struct wpa_supplicant *wpa_s)
1536 {
1537         if (!wpa_s->sched_scan_supported)
1538                 return;
1539
1540         wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling delayed sched scan");
1541         eloop_cancel_timeout(wpa_supplicant_delayed_sched_scan_timeout,
1542                              wpa_s, NULL);
1543 }
1544
1545
1546 /**
1547  * wpa_supplicant_cancel_sched_scan - Stop running scheduled scans
1548  * @wpa_s: Pointer to wpa_supplicant data
1549  *
1550  * This function is used to stop a periodic scheduled scan.
1551  */
1552 void wpa_supplicant_cancel_sched_scan(struct wpa_supplicant *wpa_s)
1553 {
1554         if (!wpa_s->sched_scanning)
1555                 return;
1556
1557         wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling sched scan");
1558         eloop_cancel_timeout(wpa_supplicant_sched_scan_timeout, wpa_s, NULL);
1559         wpa_supplicant_stop_sched_scan(wpa_s);
1560 }
1561
1562
1563 /**
1564  * wpa_supplicant_notify_scanning - Indicate possible scan state change
1565  * @wpa_s: Pointer to wpa_supplicant data
1566  * @scanning: Whether scanning is currently in progress
1567  *
1568  * This function is to generate scanning notifycations. It is called whenever
1569  * there may have been a change in scanning (scan started, completed, stopped).
1570  * wpas_notify_scanning() is called whenever the scanning state changed from the
1571  * previously notified state.
1572  */
1573 void wpa_supplicant_notify_scanning(struct wpa_supplicant *wpa_s,
1574                                     int scanning)
1575 {
1576         if (wpa_s->scanning != scanning) {
1577                 wpa_s->scanning = scanning;
1578                 wpas_notify_scanning(wpa_s);
1579         }
1580 }
1581
1582
1583 static int wpa_scan_get_max_rate(const struct wpa_scan_res *res)
1584 {
1585         int rate = 0;
1586         const u8 *ie;
1587         int i;
1588
1589         ie = wpa_scan_get_ie(res, WLAN_EID_SUPP_RATES);
1590         for (i = 0; ie && i < ie[1]; i++) {
1591                 if ((ie[i + 2] & 0x7f) > rate)
1592                         rate = ie[i + 2] & 0x7f;
1593         }
1594
1595         ie = wpa_scan_get_ie(res, WLAN_EID_EXT_SUPP_RATES);
1596         for (i = 0; ie && i < ie[1]; i++) {
1597                 if ((ie[i + 2] & 0x7f) > rate)
1598                         rate = ie[i + 2] & 0x7f;
1599         }
1600
1601         return rate;
1602 }
1603
1604
1605 /**
1606  * wpa_scan_get_ie - Fetch a specified information element from a scan result
1607  * @res: Scan result entry
1608  * @ie: Information element identitifier (WLAN_EID_*)
1609  * Returns: Pointer to the information element (id field) or %NULL if not found
1610  *
1611  * This function returns the first matching information element in the scan
1612  * result.
1613  */
1614 const u8 * wpa_scan_get_ie(const struct wpa_scan_res *res, u8 ie)
1615 {
1616         return get_ie((const u8 *) (res + 1), res->ie_len, ie);
1617 }
1618
1619
1620 /**
1621  * wpa_scan_get_vendor_ie - Fetch vendor information element from a scan result
1622  * @res: Scan result entry
1623  * @vendor_type: Vendor type (four octets starting the IE payload)
1624  * Returns: Pointer to the information element (id field) or %NULL if not found
1625  *
1626  * This function returns the first matching information element in the scan
1627  * result.
1628  */
1629 const u8 * wpa_scan_get_vendor_ie(const struct wpa_scan_res *res,
1630                                   u32 vendor_type)
1631 {
1632         const u8 *end, *pos;
1633
1634         pos = (const u8 *) (res + 1);
1635         end = pos + res->ie_len;
1636
1637         while (end - pos > 1) {
1638                 if (2 + pos[1] > end - pos)
1639                         break;
1640                 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1641                     vendor_type == WPA_GET_BE32(&pos[2]))
1642                         return pos;
1643                 pos += 2 + pos[1];
1644         }
1645
1646         return NULL;
1647 }
1648
1649
1650 /**
1651  * wpa_scan_get_vendor_ie_beacon - Fetch vendor information from a scan result
1652  * @res: Scan result entry
1653  * @vendor_type: Vendor type (four octets starting the IE payload)
1654  * Returns: Pointer to the information element (id field) or %NULL if not found
1655  *
1656  * This function returns the first matching information element in the scan
1657  * result.
1658  *
1659  * This function is like wpa_scan_get_vendor_ie(), but uses IE buffer only
1660  * from Beacon frames instead of either Beacon or Probe Response frames.
1661  */
1662 const u8 * wpa_scan_get_vendor_ie_beacon(const struct wpa_scan_res *res,
1663                                          u32 vendor_type)
1664 {
1665         const u8 *end, *pos;
1666
1667         if (res->beacon_ie_len == 0)
1668                 return NULL;
1669
1670         pos = (const u8 *) (res + 1);
1671         pos += res->ie_len;
1672         end = pos + res->beacon_ie_len;
1673
1674         while (end - pos > 1) {
1675                 if (2 + pos[1] > end - pos)
1676                         break;
1677                 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1678                     vendor_type == WPA_GET_BE32(&pos[2]))
1679                         return pos;
1680                 pos += 2 + pos[1];
1681         }
1682
1683         return NULL;
1684 }
1685
1686
1687 /**
1688  * wpa_scan_get_vendor_ie_multi - Fetch vendor IE data from a scan result
1689  * @res: Scan result entry
1690  * @vendor_type: Vendor type (four octets starting the IE payload)
1691  * Returns: Pointer to the information element payload or %NULL if not found
1692  *
1693  * This function returns concatenated payload of possibly fragmented vendor
1694  * specific information elements in the scan result. The caller is responsible
1695  * for freeing the returned buffer.
1696  */
1697 struct wpabuf * wpa_scan_get_vendor_ie_multi(const struct wpa_scan_res *res,
1698                                              u32 vendor_type)
1699 {
1700         struct wpabuf *buf;
1701         const u8 *end, *pos;
1702
1703         buf = wpabuf_alloc(res->ie_len);
1704         if (buf == NULL)
1705                 return NULL;
1706
1707         pos = (const u8 *) (res + 1);
1708         end = pos + res->ie_len;
1709
1710         while (end - pos > 1) {
1711                 if (2 + pos[1] > end - pos)
1712                         break;
1713                 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1714                     vendor_type == WPA_GET_BE32(&pos[2]))
1715                         wpabuf_put_data(buf, pos + 2 + 4, pos[1] - 4);
1716                 pos += 2 + pos[1];
1717         }
1718
1719         if (wpabuf_len(buf) == 0) {
1720                 wpabuf_free(buf);
1721                 buf = NULL;
1722         }
1723
1724         return buf;
1725 }
1726
1727
1728 /*
1729  * Channels with a great SNR can operate at full rate. What is a great SNR?
1730  * This doc https://supportforums.cisco.com/docs/DOC-12954 says, "the general
1731  * rule of thumb is that any SNR above 20 is good." This one
1732  * http://www.cisco.com/en/US/tech/tk722/tk809/technologies_q_and_a_item09186a00805e9a96.shtml#qa23
1733  * recommends 25 as a minimum SNR for 54 Mbps data rate. 30 is chosen here as a
1734  * conservative value.
1735  */
1736 #define GREAT_SNR 30
1737
1738 #define IS_5GHZ(n) (n > 4000)
1739
1740 /* Compare function for sorting scan results. Return >0 if @b is considered
1741  * better. */
1742 static int wpa_scan_result_compar(const void *a, const void *b)
1743 {
1744 #define MIN(a,b) a < b ? a : b
1745         struct wpa_scan_res **_wa = (void *) a;
1746         struct wpa_scan_res **_wb = (void *) b;
1747         struct wpa_scan_res *wa = *_wa;
1748         struct wpa_scan_res *wb = *_wb;
1749         int wpa_a, wpa_b;
1750         int snr_a, snr_b, snr_a_full, snr_b_full;
1751
1752         /* WPA/WPA2 support preferred */
1753         wpa_a = wpa_scan_get_vendor_ie(wa, WPA_IE_VENDOR_TYPE) != NULL ||
1754                 wpa_scan_get_ie(wa, WLAN_EID_RSN) != NULL;
1755         wpa_b = wpa_scan_get_vendor_ie(wb, WPA_IE_VENDOR_TYPE) != NULL ||
1756                 wpa_scan_get_ie(wb, WLAN_EID_RSN) != NULL;
1757
1758         if (wpa_b && !wpa_a)
1759                 return 1;
1760         if (!wpa_b && wpa_a)
1761                 return -1;
1762
1763         /* privacy support preferred */
1764         if ((wa->caps & IEEE80211_CAP_PRIVACY) == 0 &&
1765             (wb->caps & IEEE80211_CAP_PRIVACY))
1766                 return 1;
1767         if ((wa->caps & IEEE80211_CAP_PRIVACY) &&
1768             (wb->caps & IEEE80211_CAP_PRIVACY) == 0)
1769                 return -1;
1770
1771         if (wa->flags & wb->flags & WPA_SCAN_LEVEL_DBM) {
1772                 snr_a_full = wa->snr;
1773                 snr_a = MIN(wa->snr, GREAT_SNR);
1774                 snr_b_full = wb->snr;
1775                 snr_b = MIN(wb->snr, GREAT_SNR);
1776         } else {
1777                 /* Level is not in dBm, so we can't calculate
1778                  * SNR. Just use raw level (units unknown). */
1779                 snr_a = snr_a_full = wa->level;
1780                 snr_b = snr_b_full = wb->level;
1781         }
1782
1783         /* if SNR is close, decide by max rate or frequency band */
1784         if ((snr_a && snr_b && abs(snr_b - snr_a) < 5) ||
1785             (wa->qual && wb->qual && abs(wb->qual - wa->qual) < 10)) {
1786                 if (wa->est_throughput != wb->est_throughput)
1787                         return wb->est_throughput - wa->est_throughput;
1788                 if (IS_5GHZ(wa->freq) ^ IS_5GHZ(wb->freq))
1789                         return IS_5GHZ(wa->freq) ? -1 : 1;
1790         }
1791
1792         /* all things being equal, use SNR; if SNRs are
1793          * identical, use quality values since some drivers may only report
1794          * that value and leave the signal level zero */
1795         if (snr_b_full == snr_a_full)
1796                 return wb->qual - wa->qual;
1797         return snr_b_full - snr_a_full;
1798 #undef MIN
1799 }
1800
1801
1802 #ifdef CONFIG_WPS
1803 /* Compare function for sorting scan results when searching a WPS AP for
1804  * provisioning. Return >0 if @b is considered better. */
1805 static int wpa_scan_result_wps_compar(const void *a, const void *b)
1806 {
1807         struct wpa_scan_res **_wa = (void *) a;
1808         struct wpa_scan_res **_wb = (void *) b;
1809         struct wpa_scan_res *wa = *_wa;
1810         struct wpa_scan_res *wb = *_wb;
1811         int uses_wps_a, uses_wps_b;
1812         struct wpabuf *wps_a, *wps_b;
1813         int res;
1814
1815         /* Optimization - check WPS IE existence before allocated memory and
1816          * doing full reassembly. */
1817         uses_wps_a = wpa_scan_get_vendor_ie(wa, WPS_IE_VENDOR_TYPE) != NULL;
1818         uses_wps_b = wpa_scan_get_vendor_ie(wb, WPS_IE_VENDOR_TYPE) != NULL;
1819         if (uses_wps_a && !uses_wps_b)
1820                 return -1;
1821         if (!uses_wps_a && uses_wps_b)
1822                 return 1;
1823
1824         if (uses_wps_a && uses_wps_b) {
1825                 wps_a = wpa_scan_get_vendor_ie_multi(wa, WPS_IE_VENDOR_TYPE);
1826                 wps_b = wpa_scan_get_vendor_ie_multi(wb, WPS_IE_VENDOR_TYPE);
1827                 res = wps_ap_priority_compar(wps_a, wps_b);
1828                 wpabuf_free(wps_a);
1829                 wpabuf_free(wps_b);
1830                 if (res)
1831                         return res;
1832         }
1833
1834         /*
1835          * Do not use current AP security policy as a sorting criteria during
1836          * WPS provisioning step since the AP may get reconfigured at the
1837          * completion of provisioning.
1838          */
1839
1840         /* all things being equal, use signal level; if signal levels are
1841          * identical, use quality values since some drivers may only report
1842          * that value and leave the signal level zero */
1843         if (wb->level == wa->level)
1844                 return wb->qual - wa->qual;
1845         return wb->level - wa->level;
1846 }
1847 #endif /* CONFIG_WPS */
1848
1849
1850 static void dump_scan_res(struct wpa_scan_results *scan_res)
1851 {
1852 #ifndef CONFIG_NO_STDOUT_DEBUG
1853         size_t i;
1854
1855         if (scan_res->res == NULL || scan_res->num == 0)
1856                 return;
1857
1858         wpa_printf(MSG_EXCESSIVE, "Sorted scan results");
1859
1860         for (i = 0; i < scan_res->num; i++) {
1861                 struct wpa_scan_res *r = scan_res->res[i];
1862                 u8 *pos;
1863                 if (r->flags & WPA_SCAN_LEVEL_DBM) {
1864                         int noise_valid = !(r->flags & WPA_SCAN_NOISE_INVALID);
1865
1866                         wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d "
1867                                    "noise=%d%s level=%d snr=%d%s flags=0x%x age=%u est=%u",
1868                                    MAC2STR(r->bssid), r->freq, r->qual,
1869                                    r->noise, noise_valid ? "" : "~", r->level,
1870                                    r->snr, r->snr >= GREAT_SNR ? "*" : "",
1871                                    r->flags,
1872                                    r->age, r->est_throughput);
1873                 } else {
1874                         wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d "
1875                                    "noise=%d level=%d flags=0x%x age=%u est=%u",
1876                                    MAC2STR(r->bssid), r->freq, r->qual,
1877                                    r->noise, r->level, r->flags, r->age,
1878                                    r->est_throughput);
1879                 }
1880                 pos = (u8 *) (r + 1);
1881                 if (r->ie_len)
1882                         wpa_hexdump(MSG_EXCESSIVE, "IEs", pos, r->ie_len);
1883                 pos += r->ie_len;
1884                 if (r->beacon_ie_len)
1885                         wpa_hexdump(MSG_EXCESSIVE, "Beacon IEs",
1886                                     pos, r->beacon_ie_len);
1887         }
1888 #endif /* CONFIG_NO_STDOUT_DEBUG */
1889 }
1890
1891
1892 /**
1893  * wpa_supplicant_filter_bssid_match - Is the specified BSSID allowed
1894  * @wpa_s: Pointer to wpa_supplicant data
1895  * @bssid: BSSID to check
1896  * Returns: 0 if the BSSID is filtered or 1 if not
1897  *
1898  * This function is used to filter out specific BSSIDs from scan reslts mainly
1899  * for testing purposes (SET bssid_filter ctrl_iface command).
1900  */
1901 int wpa_supplicant_filter_bssid_match(struct wpa_supplicant *wpa_s,
1902                                       const u8 *bssid)
1903 {
1904         size_t i;
1905
1906         if (wpa_s->bssid_filter == NULL)
1907                 return 1;
1908
1909         for (i = 0; i < wpa_s->bssid_filter_count; i++) {
1910                 if (os_memcmp(wpa_s->bssid_filter + i * ETH_ALEN, bssid,
1911                               ETH_ALEN) == 0)
1912                         return 1;
1913         }
1914
1915         return 0;
1916 }
1917
1918
1919 void filter_scan_res(struct wpa_supplicant *wpa_s,
1920                      struct wpa_scan_results *res)
1921 {
1922         size_t i, j;
1923
1924         if (wpa_s->bssid_filter == NULL)
1925                 return;
1926
1927         for (i = 0, j = 0; i < res->num; i++) {
1928                 if (wpa_supplicant_filter_bssid_match(wpa_s,
1929                                                       res->res[i]->bssid)) {
1930                         res->res[j++] = res->res[i];
1931                 } else {
1932                         os_free(res->res[i]);
1933                         res->res[i] = NULL;
1934                 }
1935         }
1936
1937         if (res->num != j) {
1938                 wpa_printf(MSG_DEBUG, "Filtered out %d scan results",
1939                            (int) (res->num - j));
1940                 res->num = j;
1941         }
1942 }
1943
1944
1945 /*
1946  * Noise floor values to use when we have signal strength
1947  * measurements, but no noise floor measurements. These values were
1948  * measured in an office environment with many APs.
1949  */
1950 #define DEFAULT_NOISE_FLOOR_2GHZ (-89)
1951 #define DEFAULT_NOISE_FLOOR_5GHZ (-92)
1952
1953 void scan_snr(struct wpa_scan_res *res)
1954 {
1955         if (res->flags & WPA_SCAN_NOISE_INVALID) {
1956                 res->noise = IS_5GHZ(res->freq) ?
1957                         DEFAULT_NOISE_FLOOR_5GHZ :
1958                         DEFAULT_NOISE_FLOOR_2GHZ;
1959         }
1960
1961         if (res->flags & WPA_SCAN_LEVEL_DBM) {
1962                 res->snr = res->level - res->noise;
1963         } else {
1964                 /* Level is not in dBm, so we can't calculate
1965                  * SNR. Just use raw level (units unknown). */
1966                 res->snr = res->level;
1967         }
1968 }
1969
1970
1971 static unsigned int max_ht20_rate(int snr)
1972 {
1973         if (snr < 6)
1974                 return 6500; /* HT20 MCS0 */
1975         if (snr < 8)
1976                 return 13000; /* HT20 MCS1 */
1977         if (snr < 13)
1978                 return 19500; /* HT20 MCS2 */
1979         if (snr < 17)
1980                 return 26000; /* HT20 MCS3 */
1981         if (snr < 20)
1982                 return 39000; /* HT20 MCS4 */
1983         if (snr < 23)
1984                 return 52000; /* HT20 MCS5 */
1985         if (snr < 24)
1986                 return 58500; /* HT20 MCS6 */
1987         return 65000; /* HT20 MCS7 */
1988 }
1989
1990
1991 static unsigned int max_ht40_rate(int snr)
1992 {
1993         if (snr < 3)
1994                 return 13500; /* HT40 MCS0 */
1995         if (snr < 6)
1996                 return 27000; /* HT40 MCS1 */
1997         if (snr < 10)
1998                 return 40500; /* HT40 MCS2 */
1999         if (snr < 15)
2000                 return 54000; /* HT40 MCS3 */
2001         if (snr < 17)
2002                 return 81000; /* HT40 MCS4 */
2003         if (snr < 22)
2004                 return 108000; /* HT40 MCS5 */
2005         if (snr < 24)
2006                 return 121500; /* HT40 MCS6 */
2007         return 135000; /* HT40 MCS7 */
2008 }
2009
2010
2011 static unsigned int max_vht80_rate(int snr)
2012 {
2013         if (snr < 1)
2014                 return 0;
2015         if (snr < 2)
2016                 return 29300; /* VHT80 MCS0 */
2017         if (snr < 5)
2018                 return 58500; /* VHT80 MCS1 */
2019         if (snr < 9)
2020                 return 87800; /* VHT80 MCS2 */
2021         if (snr < 11)
2022                 return 117000; /* VHT80 MCS3 */
2023         if (snr < 15)
2024                 return 175500; /* VHT80 MCS4 */
2025         if (snr < 16)
2026                 return 234000; /* VHT80 MCS5 */
2027         if (snr < 18)
2028                 return 263300; /* VHT80 MCS6 */
2029         if (snr < 20)
2030                 return 292500; /* VHT80 MCS7 */
2031         if (snr < 22)
2032                 return 351000; /* VHT80 MCS8 */
2033         return 390000; /* VHT80 MCS9 */
2034 }
2035
2036
2037 void scan_est_throughput(struct wpa_supplicant *wpa_s,
2038                          struct wpa_scan_res *res)
2039 {
2040         enum local_hw_capab capab = wpa_s->hw_capab;
2041         int rate; /* max legacy rate in 500 kb/s units */
2042         const u8 *ie;
2043         unsigned int est, tmp;
2044         int snr = res->snr;
2045
2046         if (res->est_throughput)
2047                 return;
2048
2049         /* Get maximum legacy rate */
2050         rate = wpa_scan_get_max_rate(res);
2051
2052         /* Limit based on estimated SNR */
2053         if (rate > 1 * 2 && snr < 1)
2054                 rate = 1 * 2;
2055         else if (rate > 2 * 2 && snr < 4)
2056                 rate = 2 * 2;
2057         else if (rate > 6 * 2 && snr < 5)
2058                 rate = 6 * 2;
2059         else if (rate > 9 * 2 && snr < 6)
2060                 rate = 9 * 2;
2061         else if (rate > 12 * 2 && snr < 7)
2062                 rate = 12 * 2;
2063         else if (rate > 18 * 2 && snr < 10)
2064                 rate = 18 * 2;
2065         else if (rate > 24 * 2 && snr < 11)
2066                 rate = 24 * 2;
2067         else if (rate > 36 * 2 && snr < 15)
2068                 rate = 36 * 2;
2069         else if (rate > 48 * 2 && snr < 19)
2070                 rate = 48 * 2;
2071         else if (rate > 54 * 2 && snr < 21)
2072                 rate = 54 * 2;
2073         est = rate * 500;
2074
2075         if (capab == CAPAB_HT || capab == CAPAB_HT40 || capab == CAPAB_VHT) {
2076                 ie = wpa_scan_get_ie(res, WLAN_EID_HT_CAP);
2077                 if (ie) {
2078                         tmp = max_ht20_rate(snr);
2079                         if (tmp > est)
2080                                 est = tmp;
2081                 }
2082         }
2083
2084         if (capab == CAPAB_HT40 || capab == CAPAB_VHT) {
2085                 ie = wpa_scan_get_ie(res, WLAN_EID_HT_OPERATION);
2086                 if (ie && ie[1] >= 2 &&
2087                     (ie[3] & HT_INFO_HT_PARAM_SECONDARY_CHNL_OFF_MASK)) {
2088                         tmp = max_ht40_rate(snr);
2089                         if (tmp > est)
2090                                 est = tmp;
2091                 }
2092         }
2093
2094         if (capab == CAPAB_VHT) {
2095                 /* Use +1 to assume VHT is always faster than HT */
2096                 ie = wpa_scan_get_ie(res, WLAN_EID_VHT_CAP);
2097                 if (ie) {
2098                         tmp = max_ht20_rate(snr) + 1;
2099                         if (tmp > est)
2100                                 est = tmp;
2101
2102                         ie = wpa_scan_get_ie(res, WLAN_EID_HT_OPERATION);
2103                         if (ie && ie[1] >= 2 &&
2104                             (ie[3] &
2105                              HT_INFO_HT_PARAM_SECONDARY_CHNL_OFF_MASK)) {
2106                                 tmp = max_ht40_rate(snr) + 1;
2107                                 if (tmp > est)
2108                                         est = tmp;
2109                         }
2110
2111                         ie = wpa_scan_get_ie(res, WLAN_EID_VHT_OPERATION);
2112                         if (ie && ie[1] >= 1 &&
2113                             (ie[2] & VHT_OPMODE_CHANNEL_WIDTH_MASK)) {
2114                                 tmp = max_vht80_rate(snr) + 1;
2115                                 if (tmp > est)
2116                                         est = tmp;
2117                         }
2118                 }
2119         }
2120
2121         /* TODO: channel utilization and AP load (e.g., from AP Beacon) */
2122
2123         res->est_throughput = est;
2124 }
2125
2126
2127 /**
2128  * wpa_supplicant_get_scan_results - Get scan results
2129  * @wpa_s: Pointer to wpa_supplicant data
2130  * @info: Information about what was scanned or %NULL if not available
2131  * @new_scan: Whether a new scan was performed
2132  * Returns: Scan results, %NULL on failure
2133  *
2134  * This function request the current scan results from the driver and updates
2135  * the local BSS list wpa_s->bss. The caller is responsible for freeing the
2136  * results with wpa_scan_results_free().
2137  */
2138 struct wpa_scan_results *
2139 wpa_supplicant_get_scan_results(struct wpa_supplicant *wpa_s,
2140                                 struct scan_info *info, int new_scan)
2141 {
2142         struct wpa_scan_results *scan_res;
2143         size_t i;
2144         int (*compar)(const void *, const void *) = wpa_scan_result_compar;
2145
2146         scan_res = wpa_drv_get_scan_results2(wpa_s);
2147         if (scan_res == NULL) {
2148                 wpa_dbg(wpa_s, MSG_DEBUG, "Failed to get scan results");
2149                 return NULL;
2150         }
2151         if (scan_res->fetch_time.sec == 0) {
2152                 /*
2153                  * Make sure we have a valid timestamp if the driver wrapper
2154                  * does not set this.
2155                  */
2156                 os_get_reltime(&scan_res->fetch_time);
2157         }
2158         filter_scan_res(wpa_s, scan_res);
2159
2160         for (i = 0; i < scan_res->num; i++) {
2161                 struct wpa_scan_res *scan_res_item = scan_res->res[i];
2162
2163                 scan_snr(scan_res_item);
2164                 scan_est_throughput(wpa_s, scan_res_item);
2165         }
2166
2167 #ifdef CONFIG_WPS
2168         if (wpas_wps_searching(wpa_s)) {
2169                 wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Order scan results with WPS "
2170                         "provisioning rules");
2171                 compar = wpa_scan_result_wps_compar;
2172         }
2173 #endif /* CONFIG_WPS */
2174
2175         qsort(scan_res->res, scan_res->num, sizeof(struct wpa_scan_res *),
2176               compar);
2177         dump_scan_res(scan_res);
2178
2179         wpa_bss_update_start(wpa_s);
2180         for (i = 0; i < scan_res->num; i++)
2181                 wpa_bss_update_scan_res(wpa_s, scan_res->res[i],
2182                                         &scan_res->fetch_time);
2183         wpa_bss_update_end(wpa_s, info, new_scan);
2184
2185         return scan_res;
2186 }
2187
2188
2189 /**
2190  * wpa_supplicant_update_scan_results - Update scan results from the driver
2191  * @wpa_s: Pointer to wpa_supplicant data
2192  * Returns: 0 on success, -1 on failure
2193  *
2194  * This function updates the BSS table within wpa_supplicant based on the
2195  * currently available scan results from the driver without requesting a new
2196  * scan. This is used in cases where the driver indicates an association
2197  * (including roaming within ESS) and wpa_supplicant does not yet have the
2198  * needed information to complete the connection (e.g., to perform validation
2199  * steps in 4-way handshake).
2200  */
2201 int wpa_supplicant_update_scan_results(struct wpa_supplicant *wpa_s)
2202 {
2203         struct wpa_scan_results *scan_res;
2204         scan_res = wpa_supplicant_get_scan_results(wpa_s, NULL, 0);
2205         if (scan_res == NULL)
2206                 return -1;
2207         wpa_scan_results_free(scan_res);
2208
2209         return 0;
2210 }
2211
2212
2213 /**
2214  * scan_only_handler - Reports scan results
2215  */
2216 void scan_only_handler(struct wpa_supplicant *wpa_s,
2217                        struct wpa_scan_results *scan_res)
2218 {
2219         wpa_dbg(wpa_s, MSG_DEBUG, "Scan-only results received");
2220         if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
2221             wpa_s->manual_scan_use_id && wpa_s->own_scan_running) {
2222                 wpa_msg_ctrl(wpa_s, MSG_INFO, WPA_EVENT_SCAN_RESULTS "id=%u",
2223                              wpa_s->manual_scan_id);
2224                 wpa_s->manual_scan_use_id = 0;
2225         } else {
2226                 wpa_msg_ctrl(wpa_s, MSG_INFO, WPA_EVENT_SCAN_RESULTS);
2227         }
2228         wpas_notify_scan_results(wpa_s);
2229         wpas_notify_scan_done(wpa_s, 1);
2230         if (wpa_s->scan_work) {
2231                 struct wpa_radio_work *work = wpa_s->scan_work;
2232                 wpa_s->scan_work = NULL;
2233                 radio_work_done(work);
2234         }
2235
2236         if (wpa_s->wpa_state == WPA_SCANNING)
2237                 wpa_supplicant_set_state(wpa_s, wpa_s->scan_prev_wpa_state);
2238 }
2239
2240
2241 int wpas_scan_scheduled(struct wpa_supplicant *wpa_s)
2242 {
2243         return eloop_is_timeout_registered(wpa_supplicant_scan, wpa_s, NULL);
2244 }
2245
2246
2247 struct wpa_driver_scan_params *
2248 wpa_scan_clone_params(const struct wpa_driver_scan_params *src)
2249 {
2250         struct wpa_driver_scan_params *params;
2251         size_t i;
2252         u8 *n;
2253
2254         params = os_zalloc(sizeof(*params));
2255         if (params == NULL)
2256                 return NULL;
2257
2258         for (i = 0; i < src->num_ssids; i++) {
2259                 if (src->ssids[i].ssid) {
2260                         n = os_malloc(src->ssids[i].ssid_len);
2261                         if (n == NULL)
2262                                 goto failed;
2263                         os_memcpy(n, src->ssids[i].ssid,
2264                                   src->ssids[i].ssid_len);
2265                         params->ssids[i].ssid = n;
2266                         params->ssids[i].ssid_len = src->ssids[i].ssid_len;
2267                 }
2268         }
2269         params->num_ssids = src->num_ssids;
2270
2271         if (src->extra_ies) {
2272                 n = os_malloc(src->extra_ies_len);
2273                 if (n == NULL)
2274                         goto failed;
2275                 os_memcpy(n, src->extra_ies, src->extra_ies_len);
2276                 params->extra_ies = n;
2277                 params->extra_ies_len = src->extra_ies_len;
2278         }
2279
2280         if (src->freqs) {
2281                 int len = int_array_len(src->freqs);
2282                 params->freqs = os_malloc((len + 1) * sizeof(int));
2283                 if (params->freqs == NULL)
2284                         goto failed;
2285                 os_memcpy(params->freqs, src->freqs, (len + 1) * sizeof(int));
2286         }
2287
2288         if (src->filter_ssids) {
2289                 params->filter_ssids = os_malloc(sizeof(*params->filter_ssids) *
2290                                                  src->num_filter_ssids);
2291                 if (params->filter_ssids == NULL)
2292                         goto failed;
2293                 os_memcpy(params->filter_ssids, src->filter_ssids,
2294                           sizeof(*params->filter_ssids) *
2295                           src->num_filter_ssids);
2296                 params->num_filter_ssids = src->num_filter_ssids;
2297         }
2298
2299         params->filter_rssi = src->filter_rssi;
2300         params->p2p_probe = src->p2p_probe;
2301         params->only_new_results = src->only_new_results;
2302         params->low_priority = src->low_priority;
2303
2304         if (src->sched_scan_plans_num > 0) {
2305                 params->sched_scan_plans =
2306                         os_malloc(sizeof(*src->sched_scan_plans) *
2307                                   src->sched_scan_plans_num);
2308                 if (!params->sched_scan_plans)
2309                         goto failed;
2310
2311                 os_memcpy(params->sched_scan_plans, src->sched_scan_plans,
2312                           sizeof(*src->sched_scan_plans) *
2313                           src->sched_scan_plans_num);
2314                 params->sched_scan_plans_num = src->sched_scan_plans_num;
2315         }
2316
2317         if (src->mac_addr_rand) {
2318                 params->mac_addr_rand = src->mac_addr_rand;
2319
2320                 if (src->mac_addr && src->mac_addr_mask) {
2321                         u8 *mac_addr;
2322
2323                         mac_addr = os_malloc(2 * ETH_ALEN);
2324                         if (!mac_addr)
2325                                 goto failed;
2326
2327                         os_memcpy(mac_addr, src->mac_addr, ETH_ALEN);
2328                         os_memcpy(mac_addr + ETH_ALEN, src->mac_addr_mask,
2329                                   ETH_ALEN);
2330                         params->mac_addr = mac_addr;
2331                         params->mac_addr_mask = mac_addr + ETH_ALEN;
2332                 }
2333         }
2334
2335         if (src->bssid) {
2336                 u8 *bssid;
2337
2338                 bssid = os_malloc(ETH_ALEN);
2339                 if (!bssid)
2340                         goto failed;
2341                 os_memcpy(bssid, src->bssid, ETH_ALEN);
2342                 params->bssid = bssid;
2343         }
2344
2345         return params;
2346
2347 failed:
2348         wpa_scan_free_params(params);
2349         return NULL;
2350 }
2351
2352
2353 void wpa_scan_free_params(struct wpa_driver_scan_params *params)
2354 {
2355         size_t i;
2356
2357         if (params == NULL)
2358                 return;
2359
2360         for (i = 0; i < params->num_ssids; i++)
2361                 os_free((u8 *) params->ssids[i].ssid);
2362         os_free((u8 *) params->extra_ies);
2363         os_free(params->freqs);
2364         os_free(params->filter_ssids);
2365         os_free(params->sched_scan_plans);
2366
2367         /*
2368          * Note: params->mac_addr_mask points to same memory allocation and
2369          * must not be freed separately.
2370          */
2371         os_free((u8 *) params->mac_addr);
2372
2373         os_free((u8 *) params->bssid);
2374
2375         os_free(params);
2376 }
2377
2378
2379 int wpas_start_pno(struct wpa_supplicant *wpa_s)
2380 {
2381         int ret, prio;
2382         size_t i, num_ssid, num_match_ssid;
2383         struct wpa_ssid *ssid;
2384         struct wpa_driver_scan_params params;
2385         struct sched_scan_plan scan_plan;
2386         unsigned int max_sched_scan_ssids;
2387
2388         if (!wpa_s->sched_scan_supported)
2389                 return -1;
2390
2391         if (wpa_s->max_sched_scan_ssids > WPAS_MAX_SCAN_SSIDS)
2392                 max_sched_scan_ssids = WPAS_MAX_SCAN_SSIDS;
2393         else
2394                 max_sched_scan_ssids = wpa_s->max_sched_scan_ssids;
2395         if (max_sched_scan_ssids < 1)
2396                 return -1;
2397
2398         if (wpa_s->pno || wpa_s->pno_sched_pending)
2399                 return 0;
2400
2401         if ((wpa_s->wpa_state > WPA_SCANNING) &&
2402             (wpa_s->wpa_state <= WPA_COMPLETED)) {
2403                 wpa_printf(MSG_ERROR, "PNO: In assoc process");
2404                 return -EAGAIN;
2405         }
2406
2407         if (wpa_s->wpa_state == WPA_SCANNING) {
2408                 wpa_supplicant_cancel_scan(wpa_s);
2409                 if (wpa_s->sched_scanning) {
2410                         wpa_printf(MSG_DEBUG, "Schedule PNO on completion of "
2411                                    "ongoing sched scan");
2412                         wpa_supplicant_cancel_sched_scan(wpa_s);
2413                         wpa_s->pno_sched_pending = 1;
2414                         return 0;
2415                 }
2416         }
2417
2418         os_memset(&params, 0, sizeof(params));
2419
2420         num_ssid = num_match_ssid = 0;
2421         ssid = wpa_s->conf->ssid;
2422         while (ssid) {
2423                 if (!wpas_network_disabled(wpa_s, ssid)) {
2424                         num_match_ssid++;
2425                         if (ssid->scan_ssid)
2426                                 num_ssid++;
2427                 }
2428                 ssid = ssid->next;
2429         }
2430
2431         if (num_match_ssid == 0) {
2432                 wpa_printf(MSG_DEBUG, "PNO: No configured SSIDs");
2433                 return -1;
2434         }
2435
2436         if (num_match_ssid > num_ssid) {
2437                 params.num_ssids++; /* wildcard */
2438                 num_ssid++;
2439         }
2440
2441         if (num_ssid > max_sched_scan_ssids) {
2442                 wpa_printf(MSG_DEBUG, "PNO: Use only the first %u SSIDs from "
2443                            "%u", max_sched_scan_ssids, (unsigned int) num_ssid);
2444                 num_ssid = max_sched_scan_ssids;
2445         }
2446
2447         if (num_match_ssid > wpa_s->max_match_sets) {
2448                 num_match_ssid = wpa_s->max_match_sets;
2449                 wpa_dbg(wpa_s, MSG_DEBUG, "PNO: Too many SSIDs to match");
2450         }
2451         params.filter_ssids = os_calloc(num_match_ssid,
2452                                         sizeof(struct wpa_driver_scan_filter));
2453         if (params.filter_ssids == NULL)
2454                 return -1;
2455
2456         i = 0;
2457         prio = 0;
2458         ssid = wpa_s->conf->pssid[prio];
2459         while (ssid) {
2460                 if (!wpas_network_disabled(wpa_s, ssid)) {
2461                         if (ssid->scan_ssid && params.num_ssids < num_ssid) {
2462                                 params.ssids[params.num_ssids].ssid =
2463                                         ssid->ssid;
2464                                 params.ssids[params.num_ssids].ssid_len =
2465                                          ssid->ssid_len;
2466                                 params.num_ssids++;
2467                         }
2468                         os_memcpy(params.filter_ssids[i].ssid, ssid->ssid,
2469                                   ssid->ssid_len);
2470                         params.filter_ssids[i].ssid_len = ssid->ssid_len;
2471                         params.num_filter_ssids++;
2472                         i++;
2473                         if (i == num_match_ssid)
2474                                 break;
2475                 }
2476                 if (ssid->pnext)
2477                         ssid = ssid->pnext;
2478                 else if (prio + 1 == wpa_s->conf->num_prio)
2479                         break;
2480                 else
2481                         ssid = wpa_s->conf->pssid[++prio];
2482         }
2483
2484         if (wpa_s->conf->filter_rssi)
2485                 params.filter_rssi = wpa_s->conf->filter_rssi;
2486
2487         if (wpa_s->sched_scan_plans_num) {
2488                 params.sched_scan_plans = wpa_s->sched_scan_plans;
2489                 params.sched_scan_plans_num = wpa_s->sched_scan_plans_num;
2490         } else {
2491                 /* Set one scan plan that will run infinitely */
2492                 if (wpa_s->conf->sched_scan_interval)
2493                         scan_plan.interval = wpa_s->conf->sched_scan_interval;
2494                 else
2495                         scan_plan.interval = 10;
2496
2497                 scan_plan.iterations = 0;
2498                 params.sched_scan_plans = &scan_plan;
2499                 params.sched_scan_plans_num = 1;
2500         }
2501
2502         if (params.freqs == NULL && wpa_s->manual_sched_scan_freqs) {
2503                 wpa_dbg(wpa_s, MSG_DEBUG, "Limit sched scan to specified channels");
2504                 params.freqs = wpa_s->manual_sched_scan_freqs;
2505         }
2506
2507         if (wpa_s->mac_addr_rand_enable & MAC_ADDR_RAND_PNO) {
2508                 params.mac_addr_rand = 1;
2509                 if (wpa_s->mac_addr_pno) {
2510                         params.mac_addr = wpa_s->mac_addr_pno;
2511                         params.mac_addr_mask = wpa_s->mac_addr_pno + ETH_ALEN;
2512                 }
2513         }
2514
2515         ret = wpa_supplicant_start_sched_scan(wpa_s, &params);
2516         os_free(params.filter_ssids);
2517         if (ret == 0)
2518                 wpa_s->pno = 1;
2519         else
2520                 wpa_msg(wpa_s, MSG_ERROR, "Failed to schedule PNO");
2521         return ret;
2522 }
2523
2524
2525 int wpas_stop_pno(struct wpa_supplicant *wpa_s)
2526 {
2527         int ret = 0;
2528
2529         if (!wpa_s->pno)
2530                 return 0;
2531
2532         ret = wpa_supplicant_stop_sched_scan(wpa_s);
2533
2534         wpa_s->pno = 0;
2535         wpa_s->pno_sched_pending = 0;
2536
2537         if (wpa_s->wpa_state == WPA_SCANNING)
2538                 wpa_supplicant_req_scan(wpa_s, 0, 0);
2539
2540         return ret;
2541 }
2542
2543
2544 void wpas_mac_addr_rand_scan_clear(struct wpa_supplicant *wpa_s,
2545                                     unsigned int type)
2546 {
2547         type &= MAC_ADDR_RAND_ALL;
2548         wpa_s->mac_addr_rand_enable &= ~type;
2549
2550         if (type & MAC_ADDR_RAND_SCAN) {
2551                 os_free(wpa_s->mac_addr_scan);
2552                 wpa_s->mac_addr_scan = NULL;
2553         }
2554
2555         if (type & MAC_ADDR_RAND_SCHED_SCAN) {
2556                 os_free(wpa_s->mac_addr_sched_scan);
2557                 wpa_s->mac_addr_sched_scan = NULL;
2558         }
2559
2560         if (type & MAC_ADDR_RAND_PNO) {
2561                 os_free(wpa_s->mac_addr_pno);
2562                 wpa_s->mac_addr_pno = NULL;
2563         }
2564 }
2565
2566
2567 int wpas_mac_addr_rand_scan_set(struct wpa_supplicant *wpa_s,
2568                                 unsigned int type, const u8 *addr,
2569                                 const u8 *mask)
2570 {
2571         u8 *tmp = NULL;
2572
2573         wpas_mac_addr_rand_scan_clear(wpa_s, type);
2574
2575         if (addr) {
2576                 tmp = os_malloc(2 * ETH_ALEN);
2577                 if (!tmp)
2578                         return -1;
2579                 os_memcpy(tmp, addr, ETH_ALEN);
2580                 os_memcpy(tmp + ETH_ALEN, mask, ETH_ALEN);
2581         }
2582
2583         if (type == MAC_ADDR_RAND_SCAN) {
2584                 wpa_s->mac_addr_scan = tmp;
2585         } else if (type == MAC_ADDR_RAND_SCHED_SCAN) {
2586                 wpa_s->mac_addr_sched_scan = tmp;
2587         } else if (type == MAC_ADDR_RAND_PNO) {
2588                 wpa_s->mac_addr_pno = tmp;
2589         } else {
2590                 wpa_printf(MSG_INFO,
2591                            "scan: Invalid MAC randomization type=0x%x",
2592                            type);
2593                 os_free(tmp);
2594                 return -1;
2595         }
2596
2597         wpa_s->mac_addr_rand_enable |= type;
2598         return 0;
2599 }
2600
2601
2602 int wpas_abort_ongoing_scan(struct wpa_supplicant *wpa_s)
2603 {
2604         int scan_work = !!wpa_s->scan_work;
2605
2606 #ifdef CONFIG_P2P
2607         scan_work |= !!wpa_s->p2p_scan_work;
2608 #endif /* CONFIG_P2P */
2609
2610         if (scan_work && wpa_s->own_scan_running) {
2611                 wpa_dbg(wpa_s, MSG_DEBUG, "Abort an ongoing scan");
2612                 return wpa_drv_abort_scan(wpa_s);
2613         }
2614
2615         return 0;
2616 }
2617
2618
2619 int wpas_sched_scan_plans_set(struct wpa_supplicant *wpa_s, const char *cmd)
2620 {
2621         struct sched_scan_plan *scan_plans = NULL;
2622         const char *token, *context = NULL;
2623         unsigned int num = 0;
2624
2625         if (!cmd)
2626                 return -1;
2627
2628         if (!cmd[0]) {
2629                 wpa_printf(MSG_DEBUG, "Clear sched scan plans");
2630                 os_free(wpa_s->sched_scan_plans);
2631                 wpa_s->sched_scan_plans = NULL;
2632                 wpa_s->sched_scan_plans_num = 0;
2633                 return 0;
2634         }
2635
2636         while ((token = cstr_token(cmd, " ", &context))) {
2637                 int ret;
2638                 struct sched_scan_plan *scan_plan, *n;
2639
2640                 n = os_realloc_array(scan_plans, num + 1, sizeof(*scan_plans));
2641                 if (!n)
2642                         goto fail;
2643
2644                 scan_plans = n;
2645                 scan_plan = &scan_plans[num];
2646                 num++;
2647
2648                 ret = sscanf(token, "%u:%u", &scan_plan->interval,
2649                              &scan_plan->iterations);
2650                 if (ret <= 0 || ret > 2 || !scan_plan->interval) {
2651                         wpa_printf(MSG_ERROR,
2652                                    "Invalid sched scan plan input: %s", token);
2653                         goto fail;
2654                 }
2655
2656                 if (scan_plan->interval > wpa_s->max_sched_scan_plan_interval) {
2657                         wpa_printf(MSG_WARNING,
2658                                    "scan plan %u: Scan interval too long(%u), use the maximum allowed(%u)",
2659                                    num, scan_plan->interval,
2660                                    wpa_s->max_sched_scan_plan_interval);
2661                         scan_plan->interval =
2662                                 wpa_s->max_sched_scan_plan_interval;
2663                 }
2664
2665                 if (ret == 1) {
2666                         scan_plan->iterations = 0;
2667                         break;
2668                 }
2669
2670                 if (!scan_plan->iterations) {
2671                         wpa_printf(MSG_ERROR,
2672                                    "scan plan %u: Number of iterations cannot be zero",
2673                                    num);
2674                         goto fail;
2675                 }
2676
2677                 if (scan_plan->iterations >
2678                     wpa_s->max_sched_scan_plan_iterations) {
2679                         wpa_printf(MSG_WARNING,
2680                                    "scan plan %u: Too many iterations(%u), use the maximum allowed(%u)",
2681                                    num, scan_plan->iterations,
2682                                    wpa_s->max_sched_scan_plan_iterations);
2683                         scan_plan->iterations =
2684                                 wpa_s->max_sched_scan_plan_iterations;
2685                 }
2686
2687                 wpa_printf(MSG_DEBUG,
2688                            "scan plan %u: interval=%u iterations=%u",
2689                            num, scan_plan->interval, scan_plan->iterations);
2690         }
2691
2692         if (!scan_plans) {
2693                 wpa_printf(MSG_ERROR, "Invalid scan plans entry");
2694                 goto fail;
2695         }
2696
2697         if (cstr_token(cmd, " ", &context) || scan_plans[num - 1].iterations) {
2698                 wpa_printf(MSG_ERROR,
2699                            "All scan plans but the last must specify a number of iterations");
2700                 goto fail;
2701         }
2702
2703         wpa_printf(MSG_DEBUG, "scan plan %u (last plan): interval=%u",
2704                    num, scan_plans[num - 1].interval);
2705
2706         if (num > wpa_s->max_sched_scan_plans) {
2707                 wpa_printf(MSG_WARNING,
2708                            "Too many scheduled scan plans (only %u supported)",
2709                            wpa_s->max_sched_scan_plans);
2710                 wpa_printf(MSG_WARNING,
2711                            "Use only the first %u scan plans, and the last one (in infinite loop)",
2712                            wpa_s->max_sched_scan_plans - 1);
2713                 os_memcpy(&scan_plans[wpa_s->max_sched_scan_plans - 1],
2714                           &scan_plans[num - 1], sizeof(*scan_plans));
2715                 num = wpa_s->max_sched_scan_plans;
2716         }
2717
2718         os_free(wpa_s->sched_scan_plans);
2719         wpa_s->sched_scan_plans = scan_plans;
2720         wpa_s->sched_scan_plans_num = num;
2721
2722         return 0;
2723
2724 fail:
2725         os_free(scan_plans);
2726         wpa_printf(MSG_ERROR, "invalid scan plans list");
2727         return -1;
2728 }