wpa_supplicant/sme.c

   1 /*
   2  * wpa_supplicant - SME
   3  * Copyright (c) 2009-2010, Jouni Malinen <j@w1.fi>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 as
   7  * published by the Free Software Foundation.
   8  *
   9  * Alternatively, this software may be distributed under the terms of BSD
  10  * license.
  11  *
  12  * See README and COPYING for more details.
  13  */
  14
  15 #include "includes.h"
  16
  17 #include "common.h"
  18 #include "common/ieee802_11_defs.h"
  19 #include "common/ieee802_11_common.h"
  20 #include "eapol_supp/eapol_supp_sm.h"
  21 #include "common/wpa_common.h"
  22 #include "rsn_supp/wpa.h"
  23 #include "rsn_supp/pmksa_cache.h"
  24 #include "config.h"
  25 #include "wpa_supplicant_i.h"
  26 #include "driver_i.h"
  27 #include "wpas_glue.h"
  28 #include "wps_supplicant.h"
  29 #include "p2p_supplicant.h"
  30 #include "notify.h"
  31 #include "blacklist.h"
  32 #include "bss.h"
  33 #include "scan.h"
  34 #include "sme.h"
  35
  36 static int sme_another_bss_in_ess(struct wpa_supplicant *wpa_s)
  37 {
  38         struct wpa_bss *bss, *cbss;
  39
  40         cbss = wpa_s->current_bss;
  41
  42         dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list) {
  43                 if (bss == cbss)
  44                         continue;
  45                 if (bss->ssid_len == cbss->ssid_len &&
  46                     os_memcmp(bss->ssid, cbss->ssid, bss->ssid_len) == 0 &&
  47                     wpa_blacklist_get(wpa_s, bss->bssid) == NULL)
  48                         return 1;
  49         }
  50
  51         return 0;
  52 }
  53
  54
  55 static void sme_connection_failed(struct wpa_supplicant *wpa_s,
  56                                   const u8 *bssid)
  57 {
  58         int timeout;
  59         int count;
  60
  61         /*
  62          * Add the failed BSSID into the blacklist and speed up next scan
  63          * attempt if there could be other APs that could accept association.
  64          * The current blacklist count indicates how many times we have tried
  65          * connecting to this AP and multiple attempts mean that other APs are
  66          * either not available or has already been tried, so that we can start
  67          * increasing the delay here to avoid constant scanning.
  68          */
  69         count = wpa_blacklist_add(wpa_s, bssid);
  70         if (count == 1 && wpa_s->current_bss) {
  71                 /*
  72                  * This BSS was not in the blacklist before. If there is
  73                  * another BSS available for the same ESS, we should try that
  74                  * next. Otherwise, we may as well try this one once more
  75                  * before allowing other, likely worse, ESSes to be considered.
  76                  */
  77                 if (sme_another_bss_in_ess(wpa_s)) {
  78                         wpa_printf(MSG_DEBUG, "SME: Another BSS in this ESS "
  79                                    "has been seen; try it next");
  80                         wpa_blacklist_add(wpa_s, bssid);
  81                 }
  82         }
  83
  84         switch (count) {
  85         case 1:
  86                 timeout = 100;
  87                 break;
  88         case 2:
  89                 timeout = 500;
  90                 break;
  91         case 3:
  92                 timeout = 1000;
  93                 break;
  94         default:
  95                 timeout = 5000;
  96         }
  97
  98         /*
  99          * TODO: if more than one possible AP is available in scan results,
 100          * could try the other ones before requesting a new scan.
 101          */
 102         wpa_supplicant_req_scan(wpa_s, timeout / 1000,
 103                                 1000 * (timeout % 1000));
 104 }
 105
 106
 107 void sme_authenticate(struct wpa_supplicant *wpa_s,
 108                       struct wpa_bss *bss, struct wpa_ssid *ssid)
 109 {
 110         struct wpa_driver_auth_params params;
 111         struct wpa_ssid *old_ssid;
 112 #ifdef CONFIG_IEEE80211R
 113         const u8 *ie;
 114 #endif /* CONFIG_IEEE80211R */
 115 #ifdef CONFIG_IEEE80211R
 116         const u8 *md = NULL;
 117 #endif /* CONFIG_IEEE80211R */
 118         int i, bssid_changed;
 119
 120         if (bss == NULL) {
 121                 wpa_printf(MSG_ERROR, "SME: No scan result available for the "
 122                            "network");
 123                 return;
 124         }
 125
 126         wpa_s->current_bss = bss;
 127
 128         os_memset(&params, 0, sizeof(params));
 129         wpa_s->reassociate = 0;
 130
 131         params.freq = bss->freq;
 132         params.bssid = bss->bssid;
 133         params.ssid = bss->ssid;
 134         params.ssid_len = bss->ssid_len;
 135
 136         if (wpa_s->sme.ssid_len != params.ssid_len ||
 137             os_memcmp(wpa_s->sme.ssid, params.ssid, params.ssid_len) != 0)
 138                 wpa_s->sme.prev_bssid_set = 0;
 139
 140         wpa_s->sme.freq = params.freq;
 141         os_memcpy(wpa_s->sme.ssid, params.ssid, params.ssid_len);
 142         wpa_s->sme.ssid_len = params.ssid_len;
 143
 144         params.auth_alg = WPA_AUTH_ALG_OPEN;
 145 #ifdef IEEE8021X_EAPOL
 146         if (ssid->key_mgmt & WPA_KEY_MGMT_IEEE8021X_NO_WPA) {
 147                 if (ssid->leap) {
 148                         if (ssid->non_leap == 0)
 149                                 params.auth_alg = WPA_AUTH_ALG_LEAP;
 150                         else
 151                                 params.auth_alg |= WPA_AUTH_ALG_LEAP;
 152                 }
 153         }
 154 #endif /* IEEE8021X_EAPOL */
 155         wpa_printf(MSG_DEBUG, "Automatic auth_alg selection: 0x%x",
 156                    params.auth_alg);
 157         if (ssid->auth_alg) {
 158                 params.auth_alg = ssid->auth_alg;
 159                 wpa_printf(MSG_DEBUG, "Overriding auth_alg selection: 0x%x",
 160                            params.auth_alg);
 161         }
 162
 163         for (i = 0; i < NUM_WEP_KEYS; i++) {
 164                 if (ssid->wep_key_len[i])
 165                         params.wep_key[i] = ssid->wep_key[i];
 166                 params.wep_key_len[i] = ssid->wep_key_len[i];
 167         }
 168         params.wep_tx_keyidx = ssid->wep_tx_keyidx;
 169
 170         bssid_changed = !is_zero_ether_addr(wpa_s->bssid);
 171         os_memset(wpa_s->bssid, 0, ETH_ALEN);
 172         os_memcpy(wpa_s->pending_bssid, bss->bssid, ETH_ALEN);
 173         if (bssid_changed)
 174                 wpas_notify_bssid_changed(wpa_s);
 175
 176         if ((wpa_bss_get_vendor_ie(bss, WPA_IE_VENDOR_TYPE) ||
 177              wpa_bss_get_ie(bss, WLAN_EID_RSN)) &&
 178             (ssid->key_mgmt & (WPA_KEY_MGMT_IEEE8021X | WPA_KEY_MGMT_PSK |
 179                                WPA_KEY_MGMT_FT_IEEE8021X |
 180                                WPA_KEY_MGMT_FT_PSK |
 181                                WPA_KEY_MGMT_IEEE8021X_SHA256 |
 182                                WPA_KEY_MGMT_PSK_SHA256))) {
 183                 int try_opportunistic;
 184                 try_opportunistic = ssid->proactive_key_caching &&
 185                         (ssid->proto & WPA_PROTO_RSN);
 186                 if (pmksa_cache_set_current(wpa_s->wpa, NULL, bss->bssid,
 187                                             wpa_s->current_ssid,
 188                                             try_opportunistic) == 0)
 189                         eapol_sm_notify_pmkid_attempt(wpa_s->eapol, 1);
 190                 wpa_s->sme.assoc_req_ie_len = sizeof(wpa_s->sme.assoc_req_ie);
 191                 if (wpa_supplicant_set_suites(wpa_s, bss, ssid,
 192                                               wpa_s->sme.assoc_req_ie,
 193                                               &wpa_s->sme.assoc_req_ie_len)) {
 194                         wpa_printf(MSG_WARNING, "SME: Failed to set WPA key "
 195                                    "management and encryption suites");
 196                         return;
 197                 }
 198         } else if (ssid->key_mgmt &
 199                    (WPA_KEY_MGMT_PSK | WPA_KEY_MGMT_IEEE8021X |
 200                     WPA_KEY_MGMT_WPA_NONE | WPA_KEY_MGMT_FT_PSK |
 201                     WPA_KEY_MGMT_FT_IEEE8021X | WPA_KEY_MGMT_PSK_SHA256 |
 202                     WPA_KEY_MGMT_IEEE8021X_SHA256)) {
 203                 wpa_s->sme.assoc_req_ie_len = sizeof(wpa_s->sme.assoc_req_ie);
 204                 if (wpa_supplicant_set_suites(wpa_s, NULL, ssid,
 205                                               wpa_s->sme.assoc_req_ie,
 206                                               &wpa_s->sme.assoc_req_ie_len)) {
 207                         wpa_printf(MSG_WARNING, "SME: Failed to set WPA key "
 208                                    "management and encryption suites (no scan "
 209                                    "results)");
 210                         return;
 211                 }
 212 #ifdef CONFIG_WPS
 213         } else if (ssid->key_mgmt & WPA_KEY_MGMT_WPS) {
 214                 struct wpabuf *wps_ie;
 215                 wps_ie = wps_build_assoc_req_ie(wpas_wps_get_req_type(ssid));
 216                 if (wps_ie && wpabuf_len(wps_ie) <=
 217                     sizeof(wpa_s->sme.assoc_req_ie)) {
 218                         wpa_s->sme.assoc_req_ie_len = wpabuf_len(wps_ie);
 219                         os_memcpy(wpa_s->sme.assoc_req_ie, wpabuf_head(wps_ie),
 220                                   wpa_s->sme.assoc_req_ie_len);
 221                 } else
 222                         wpa_s->sme.assoc_req_ie_len = 0;
 223                 wpabuf_free(wps_ie);
 224                 wpa_supplicant_set_non_wpa_policy(wpa_s, ssid);
 225 #endif /* CONFIG_WPS */
 226         } else {
 227                 wpa_supplicant_set_non_wpa_policy(wpa_s, ssid);
 228                 wpa_s->sme.assoc_req_ie_len = 0;
 229         }
 230
 231 #ifdef CONFIG_IEEE80211R
 232         ie = wpa_bss_get_ie(bss, WLAN_EID_MOBILITY_DOMAIN);
 233         if (ie && ie[1] >= MOBILITY_DOMAIN_ID_LEN)
 234                 md = ie + 2;
 235         wpa_sm_set_ft_params(wpa_s->wpa, ie, ie ? 2 + ie[1] : 0);
 236         if (md) {
 237                 /* Prepare for the next transition */
 238                 wpa_ft_prepare_auth_request(wpa_s->wpa, ie);
 239         }
 240
 241         if (md && ssid->key_mgmt & (WPA_KEY_MGMT_FT_PSK |
 242                                     WPA_KEY_MGMT_FT_IEEE8021X)) {
 243                 if (wpa_s->sme.assoc_req_ie_len + 5 <
 244                     sizeof(wpa_s->sme.assoc_req_ie)) {
 245                         struct rsn_mdie *mdie;
 246                         u8 *pos = wpa_s->sme.assoc_req_ie +
 247                                 wpa_s->sme.assoc_req_ie_len;
 248                         *pos++ = WLAN_EID_MOBILITY_DOMAIN;
 249                         *pos++ = sizeof(*mdie);
 250                         mdie = (struct rsn_mdie *) pos;
 251                         os_memcpy(mdie->mobility_domain, md,
 252                                   MOBILITY_DOMAIN_ID_LEN);
 253                         mdie->ft_capab = md[MOBILITY_DOMAIN_ID_LEN];
 254                         wpa_s->sme.assoc_req_ie_len += 5;
 255                 }
 256
 257                 if (wpa_s->sme.ft_used &&
 258                     os_memcmp(md, wpa_s->sme.mobility_domain, 2) == 0 &&
 259                     wpa_sm_has_ptk(wpa_s->wpa)) {
 260                         wpa_printf(MSG_DEBUG, "SME: Trying to use FT "
 261                                    "over-the-air");
 262                         params.auth_alg = WPA_AUTH_ALG_FT;
 263                         params.ie = wpa_s->sme.ft_ies;
 264                         params.ie_len = wpa_s->sme.ft_ies_len;
 265                 }
 266         }
 267 #endif /* CONFIG_IEEE80211R */
 268
 269 #ifdef CONFIG_IEEE80211W
 270         wpa_s->sme.mfp = ssid->ieee80211w;
 271         if (ssid->ieee80211w != NO_MGMT_FRAME_PROTECTION) {
 272                 const u8 *rsn = wpa_bss_get_ie(bss, WLAN_EID_RSN);
 273                 struct wpa_ie_data _ie;
 274                 if (rsn && wpa_parse_wpa_ie(rsn, 2 + rsn[1], &_ie) == 0 &&
 275                     _ie.capabilities &
 276                     (WPA_CAPABILITY_MFPC | WPA_CAPABILITY_MFPR)) {
 277                         wpa_printf(MSG_DEBUG, "WPA: Selected AP supports MFP: "
 278                                    "require MFP");
 279                         wpa_s->sme.mfp = MGMT_FRAME_PROTECTION_REQUIRED;
 280                 }
 281         }
 282 #endif /* CONFIG_IEEE80211W */
 283
 284 #ifdef CONFIG_P2P
 285         if (wpa_s->global->p2p) {
 286                 u8 *pos;
 287                 size_t len;
 288                 int res;
 289                 int p2p_group;
 290                 p2p_group = wpa_s->drv_flags & WPA_DRIVER_FLAGS_P2P_CAPABLE;
 291                 pos = wpa_s->sme.assoc_req_ie + wpa_s->sme.assoc_req_ie_len;
 292                 len = sizeof(wpa_s->sme.assoc_req_ie) -
 293                         wpa_s->sme.assoc_req_ie_len;
 294                 res = wpas_p2p_assoc_req_ie(wpa_s, bss, pos, len, p2p_group);
 295                 if (res >= 0)
 296                         wpa_s->sme.assoc_req_ie_len += res;
 297         }
 298 #endif /* CONFIG_P2P */
 299
 300         wpa_supplicant_cancel_scan(wpa_s);
 301
 302         wpa_msg(wpa_s, MSG_INFO, "Trying to authenticate with " MACSTR
 303                 " (SSID='%s' freq=%d MHz)", MAC2STR(params.bssid),
 304                 wpa_ssid_txt(params.ssid, params.ssid_len), params.freq);
 305
 306         wpa_clear_keys(wpa_s, bss->bssid);
 307         wpa_supplicant_set_state(wpa_s, WPA_AUTHENTICATING);
 308         old_ssid = wpa_s->current_ssid;
 309         wpa_s->current_ssid = ssid;
 310         wpa_supplicant_rsn_supp_set_config(wpa_s, wpa_s->current_ssid);
 311         wpa_supplicant_initiate_eapol(wpa_s);
 312         if (old_ssid != wpa_s->current_ssid)
 313                 wpas_notify_network_changed(wpa_s);
 314
 315         wpa_s->sme.auth_alg = params.auth_alg;
 316         if (wpa_drv_authenticate(wpa_s, &params) < 0) {
 317                 wpa_msg(wpa_s, MSG_INFO, "Authentication request to the "
 318                         "driver failed");
 319                 wpa_supplicant_req_scan(wpa_s, 1, 0);
 320                 return;
 321         }
 322
 323         /* TODO: add timeout on authentication */
 324
 325         /*
 326          * Association will be started based on the authentication event from
 327          * the driver.
 328          */
 329 }
 330
 331
 332 void sme_event_auth(struct wpa_supplicant *wpa_s, union wpa_event_data *data)
 333 {
 334         struct wpa_ssid *ssid = wpa_s->current_ssid;
 335
 336         if (ssid == NULL) {
 337                 wpa_printf(MSG_DEBUG, "SME: Ignore authentication event when "
 338                            "network is not selected");
 339                 return;
 340         }
 341
 342         if (wpa_s->wpa_state != WPA_AUTHENTICATING) {
 343                 wpa_printf(MSG_DEBUG, "SME: Ignore authentication event when "
 344                            "not in authenticating state");
 345                 return;
 346         }
 347
 348         if (os_memcmp(wpa_s->pending_bssid, data->auth.peer, ETH_ALEN) != 0) {
 349                 wpa_printf(MSG_DEBUG, "SME: Ignore authentication with "
 350                            "unexpected peer " MACSTR,
 351                            MAC2STR(data->auth.peer));
 352                 return;
 353         }
 354
 355         wpa_printf(MSG_DEBUG, "SME: Authentication response: peer=" MACSTR
 356                    " auth_type=%d status_code=%d",
 357                    MAC2STR(data->auth.peer), data->auth.auth_type,
 358                    data->auth.status_code);
 359         wpa_hexdump(MSG_MSGDUMP, "SME: Authentication response IEs",
 360                     data->auth.ies, data->auth.ies_len);
 361
 362         if (data->auth.status_code != WLAN_STATUS_SUCCESS) {
 363                 wpa_printf(MSG_DEBUG, "SME: Authentication failed (status "
 364                            "code %d)", data->auth.status_code);
 365
 366                 if (data->auth.status_code !=
 367                     WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG ||
 368                     wpa_s->sme.auth_alg == data->auth.auth_type ||
 369                     wpa_s->current_ssid->auth_alg == WPA_AUTH_ALG_LEAP) {
 370                         sme_connection_failed(wpa_s, wpa_s->pending_bssid);
 371                         return;
 372                 }
 373
 374                 switch (data->auth.auth_type) {
 375                 case WLAN_AUTH_OPEN:
 376                         wpa_s->current_ssid->auth_alg = WPA_AUTH_ALG_SHARED;
 377
 378                         wpa_printf(MSG_DEBUG, "SME: Trying SHARED auth");
 379                         wpa_supplicant_associate(wpa_s, wpa_s->current_bss,
 380                                                  wpa_s->current_ssid);
 381                         return;
 382
 383                 case WLAN_AUTH_SHARED_KEY:
 384                         wpa_s->current_ssid->auth_alg = WPA_AUTH_ALG_LEAP;
 385
 386                         wpa_printf(MSG_DEBUG, "SME: Trying LEAP auth");
 387                         wpa_supplicant_associate(wpa_s, wpa_s->current_bss,
 388                                                  wpa_s->current_ssid);
 389                         return;
 390
 391                 default:
 392                         return;
 393                 }
 394         }
 395
 396 #ifdef CONFIG_IEEE80211R
 397         if (data->auth.auth_type == WLAN_AUTH_FT) {
 398                 union wpa_event_data edata;
 399                 os_memset(&edata, 0, sizeof(edata));
 400                 edata.ft_ies.ies = data->auth.ies;
 401                 edata.ft_ies.ies_len = data->auth.ies_len;
 402                 os_memcpy(edata.ft_ies.target_ap, data->auth.peer, ETH_ALEN);
 403                 wpa_supplicant_event(wpa_s, EVENT_FT_RESPONSE, &edata);
 404         }
 405 #endif /* CONFIG_IEEE80211R */
 406
 407         sme_associate(wpa_s, ssid->mode, data->auth.peer,
 408                       data->auth.auth_type);
 409 }
 410
 411
 412 void sme_associate(struct wpa_supplicant *wpa_s, enum wpas_mode mode,
 413                    const u8 *bssid, u16 auth_type)
 414 {
 415         struct wpa_driver_associate_params params;
 416         struct ieee802_11_elems elems;
 417
 418         os_memset(&params, 0, sizeof(params));
 419         params.bssid = bssid;
 420         params.ssid = wpa_s->sme.ssid;
 421         params.ssid_len = wpa_s->sme.ssid_len;
 422         params.freq = wpa_s->sme.freq;
 423         params.wpa_ie = wpa_s->sme.assoc_req_ie_len ?
 424                 wpa_s->sme.assoc_req_ie : NULL;
 425         params.wpa_ie_len = wpa_s->sme.assoc_req_ie_len;
 426 #ifdef CONFIG_IEEE80211R
 427         if (auth_type == WLAN_AUTH_FT && wpa_s->sme.ft_ies) {
 428                 params.wpa_ie = wpa_s->sme.ft_ies;
 429                 params.wpa_ie_len = wpa_s->sme.ft_ies_len;
 430         }
 431 #endif /* CONFIG_IEEE80211R */
 432         params.mode = mode;
 433         params.mgmt_frame_protection = wpa_s->sme.mfp;
 434         if (wpa_s->sme.prev_bssid_set)
 435                 params.prev_bssid = wpa_s->sme.prev_bssid;
 436
 437         wpa_msg(wpa_s, MSG_INFO, "Trying to associate with " MACSTR
 438                 " (SSID='%s' freq=%d MHz)", MAC2STR(params.bssid),
 439                 params.ssid ? wpa_ssid_txt(params.ssid, params.ssid_len) : "",
 440                 params.freq);
 441
 442         wpa_supplicant_set_state(wpa_s, WPA_ASSOCIATING);
 443
 444         if (params.wpa_ie == NULL ||
 445             ieee802_11_parse_elems(params.wpa_ie, params.wpa_ie_len, &elems, 0)
 446             < 0) {
 447                 wpa_printf(MSG_DEBUG, "SME: Could not parse own IEs?!");
 448                 os_memset(&elems, 0, sizeof(elems));
 449         }
 450         if (elems.rsn_ie)
 451                 wpa_sm_set_assoc_wpa_ie(wpa_s->wpa, elems.rsn_ie - 2,
 452                                         elems.rsn_ie_len + 2);
 453         else if (elems.wpa_ie)
 454                 wpa_sm_set_assoc_wpa_ie(wpa_s->wpa, elems.wpa_ie - 2,
 455                                         elems.wpa_ie_len + 2);
 456         else
 457                 wpa_sm_set_assoc_wpa_ie(wpa_s->wpa, NULL, 0);
 458         if (elems.p2p &&
 459             (wpa_s->drv_flags & WPA_DRIVER_FLAGS_P2P_CAPABLE))
 460                 params.p2p = 1;
 461
 462         if (wpa_s->parent->set_sta_uapsd)
 463                 params.uapsd = wpa_s->parent->sta_uapsd;
 464         else
 465                 params.uapsd = -1;
 466
 467         if (wpa_drv_associate(wpa_s, &params) < 0) {
 468                 wpa_msg(wpa_s, MSG_INFO, "Association request to the driver "
 469                         "failed");
 470                 wpa_supplicant_req_scan(wpa_s, 5, 0);
 471                 return;
 472         }
 473
 474         /* TODO: add timeout on association */
 475 }
 476
 477
 478 int sme_update_ft_ies(struct wpa_supplicant *wpa_s, const u8 *md,
 479                       const u8 *ies, size_t ies_len)
 480 {
 481         if (md == NULL || ies == NULL) {
 482                 wpa_printf(MSG_DEBUG, "SME: Remove mobility domain");
 483                 os_free(wpa_s->sme.ft_ies);
 484                 wpa_s->sme.ft_ies = NULL;
 485                 wpa_s->sme.ft_ies_len = 0;
 486                 wpa_s->sme.ft_used = 0;
 487                 return 0;
 488         }
 489
 490         os_memcpy(wpa_s->sme.mobility_domain, md, MOBILITY_DOMAIN_ID_LEN);
 491         wpa_hexdump(MSG_DEBUG, "SME: FT IEs", ies, ies_len);
 492         os_free(wpa_s->sme.ft_ies);
 493         wpa_s->sme.ft_ies = os_malloc(ies_len);
 494         if (wpa_s->sme.ft_ies == NULL)
 495                 return -1;
 496         os_memcpy(wpa_s->sme.ft_ies, ies, ies_len);
 497         wpa_s->sme.ft_ies_len = ies_len;
 498         return 0;
 499 }
 500
 501
 502 void sme_event_assoc_reject(struct wpa_supplicant *wpa_s,
 503                             union wpa_event_data *data)
 504 {
 505         int bssid_changed;
 506
 507         wpa_printf(MSG_DEBUG, "SME: Association with " MACSTR " failed: "
 508                    "status code %d", MAC2STR(wpa_s->pending_bssid),
 509                    data->assoc_reject.status_code);
 510
 511         bssid_changed = !is_zero_ether_addr(wpa_s->bssid);
 512
 513         /*
 514          * For now, unconditionally terminate the previous authentication. In
 515          * theory, this should not be needed, but mac80211 gets quite confused
 516          * if the authentication is left pending.. Some roaming cases might
 517          * benefit from using the previous authentication, so this could be
 518          * optimized in the future.
 519          */
 520         if (wpa_drv_deauthenticate(wpa_s, wpa_s->pending_bssid,
 521                                    WLAN_REASON_DEAUTH_LEAVING) < 0) {
 522                 wpa_msg(wpa_s, MSG_INFO,
 523                         "Deauth request to the driver failed");
 524         }
 525         wpa_s->sme.prev_bssid_set = 0;
 526
 527         sme_connection_failed(wpa_s, wpa_s->pending_bssid);
 528         wpa_supplicant_set_state(wpa_s, WPA_DISCONNECTED);
 529         os_memset(wpa_s->bssid, 0, ETH_ALEN);
 530         os_memset(wpa_s->pending_bssid, 0, ETH_ALEN);
 531         if (bssid_changed)
 532                 wpas_notify_bssid_changed(wpa_s);
 533 }
 534
 535
 536 void sme_event_auth_timed_out(struct wpa_supplicant *wpa_s,
 537                               union wpa_event_data *data)
 538 {
 539         wpa_printf(MSG_DEBUG, "SME: Authentication timed out");
 540         sme_connection_failed(wpa_s, wpa_s->pending_bssid);
 541 }
 542
 543
 544 void sme_event_assoc_timed_out(struct wpa_supplicant *wpa_s,
 545                                union wpa_event_data *data)
 546 {
 547         wpa_printf(MSG_DEBUG, "SME: Association timed out");
 548         sme_connection_failed(wpa_s, wpa_s->pending_bssid);
 549         wpa_supplicant_mark_disassoc(wpa_s);
 550 }
 551
 552
 553 void sme_event_disassoc(struct wpa_supplicant *wpa_s,
 554                         union wpa_event_data *data)
 555 {
 556         wpa_printf(MSG_DEBUG, "SME: Disassociation event received");
 557         if (wpa_s->sme.prev_bssid_set &&
 558             !(wpa_s->drv_flags & WPA_DRIVER_FLAGS_USER_SPACE_MLME)) {
 559                 /*
 560                  * cfg80211/mac80211 can get into somewhat confused state if
 561                  * the AP only disassociates us and leaves us in authenticated
 562                  * state. For now, force the state to be cleared to avoid
 563                  * confusing errors if we try to associate with the AP again.
 564                  */
 565                 wpa_printf(MSG_DEBUG, "SME: Deauthenticate to clear driver "
 566                            "state");
 567                 wpa_drv_deauthenticate(wpa_s, wpa_s->sme.prev_bssid,
 568                                        WLAN_REASON_DEAUTH_LEAVING);
 569         }
 570 }