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 "utils/eloop.h"
  19 #include "common/ieee802_11_defs.h"
  20 #include "common/ieee802_11_common.h"
  21 #include "eapol_supp/eapol_supp_sm.h"
  22 #include "common/wpa_common.h"
  23 #include "rsn_supp/wpa.h"
  24 #include "rsn_supp/pmksa_cache.h"
  25 #include "config.h"
  26 #include "wpa_supplicant_i.h"
  27 #include "driver_i.h"
  28 #include "wpas_glue.h"
  29 #include "wps_supplicant.h"
  30 #include "p2p_supplicant.h"
  31 #include "notify.h"
  32 #include "blacklist.h"
  33 #include "bss.h"
  34 #include "scan.h"
  35 #include "sme.h"
  36
  37 void sme_authenticate(struct wpa_supplicant *wpa_s,
  38                       struct wpa_bss *bss, struct wpa_ssid *ssid)
  39 {
  40         struct wpa_driver_auth_params params;
  41         struct wpa_ssid *old_ssid;
  42 #ifdef CONFIG_IEEE80211R
  43         const u8 *ie;
  44 #endif /* CONFIG_IEEE80211R */
  45 #ifdef CONFIG_IEEE80211R
  46         const u8 *md = NULL;
  47 #endif /* CONFIG_IEEE80211R */
  48         int i, bssid_changed;
  49
  50         if (bss == NULL) {
  51                 wpa_printf(MSG_ERROR, "SME: No scan result available for the "
  52                            "network");
  53                 return;
  54         }
  55
  56         wpa_s->current_bss = bss;
  57
  58         os_memset(&params, 0, sizeof(params));
  59         wpa_s->reassociate = 0;
  60
  61         params.freq = bss->freq;
  62         params.bssid = bss->bssid;
  63         params.ssid = bss->ssid;
  64         params.ssid_len = bss->ssid_len;
  65
  66         if (wpa_s->sme.ssid_len != params.ssid_len ||
  67             os_memcmp(wpa_s->sme.ssid, params.ssid, params.ssid_len) != 0)
  68                 wpa_s->sme.prev_bssid_set = 0;
  69
  70         wpa_s->sme.freq = params.freq;
  71         os_memcpy(wpa_s->sme.ssid, params.ssid, params.ssid_len);
  72         wpa_s->sme.ssid_len = params.ssid_len;
  73
  74         params.auth_alg = WPA_AUTH_ALG_OPEN;
  75 #ifdef IEEE8021X_EAPOL
  76         if (ssid->key_mgmt & WPA_KEY_MGMT_IEEE8021X_NO_WPA) {
  77                 if (ssid->leap) {
  78                         if (ssid->non_leap == 0)
  79                                 params.auth_alg = WPA_AUTH_ALG_LEAP;
  80                         else
  81                                 params.auth_alg |= WPA_AUTH_ALG_LEAP;
  82                 }
  83         }
  84 #endif /* IEEE8021X_EAPOL */
  85         wpa_printf(MSG_DEBUG, "Automatic auth_alg selection: 0x%x",
  86                    params.auth_alg);
  87         if (ssid->auth_alg) {
  88                 params.auth_alg = ssid->auth_alg;
  89                 wpa_printf(MSG_DEBUG, "Overriding auth_alg selection: 0x%x",
  90                            params.auth_alg);
  91         }
  92
  93         for (i = 0; i < NUM_WEP_KEYS; i++) {
  94                 if (ssid->wep_key_len[i])
  95                         params.wep_key[i] = ssid->wep_key[i];
  96                 params.wep_key_len[i] = ssid->wep_key_len[i];
  97         }
  98         params.wep_tx_keyidx = ssid->wep_tx_keyidx;
  99
 100         bssid_changed = !is_zero_ether_addr(wpa_s->bssid);
 101         os_memset(wpa_s->bssid, 0, ETH_ALEN);
 102         os_memcpy(wpa_s->pending_bssid, bss->bssid, ETH_ALEN);
 103         if (bssid_changed)
 104                 wpas_notify_bssid_changed(wpa_s);
 105
 106         if ((wpa_bss_get_vendor_ie(bss, WPA_IE_VENDOR_TYPE) ||
 107              wpa_bss_get_ie(bss, WLAN_EID_RSN)) &&
 108             (ssid->key_mgmt & (WPA_KEY_MGMT_IEEE8021X | WPA_KEY_MGMT_PSK |
 109                                WPA_KEY_MGMT_FT_IEEE8021X |
 110                                WPA_KEY_MGMT_FT_PSK |
 111                                WPA_KEY_MGMT_IEEE8021X_SHA256 |
 112                                WPA_KEY_MGMT_PSK_SHA256))) {
 113                 int try_opportunistic;
 114                 try_opportunistic = ssid->proactive_key_caching &&
 115                         (ssid->proto & WPA_PROTO_RSN);
 116                 if (pmksa_cache_set_current(wpa_s->wpa, NULL, bss->bssid,
 117                                             wpa_s->current_ssid,
 118                                             try_opportunistic) == 0)
 119                         eapol_sm_notify_pmkid_attempt(wpa_s->eapol, 1);
 120                 wpa_s->sme.assoc_req_ie_len = sizeof(wpa_s->sme.assoc_req_ie);
 121                 if (wpa_supplicant_set_suites(wpa_s, bss, ssid,
 122                                               wpa_s->sme.assoc_req_ie,
 123                                               &wpa_s->sme.assoc_req_ie_len)) {
 124                         wpa_printf(MSG_WARNING, "SME: Failed to set WPA key "
 125                                    "management and encryption suites");
 126                         return;
 127                 }
 128         } else if (ssid->key_mgmt &
 129                    (WPA_KEY_MGMT_PSK | WPA_KEY_MGMT_IEEE8021X |
 130                     WPA_KEY_MGMT_WPA_NONE | WPA_KEY_MGMT_FT_PSK |
 131                     WPA_KEY_MGMT_FT_IEEE8021X | WPA_KEY_MGMT_PSK_SHA256 |
 132                     WPA_KEY_MGMT_IEEE8021X_SHA256)) {
 133                 wpa_s->sme.assoc_req_ie_len = sizeof(wpa_s->sme.assoc_req_ie);
 134                 if (wpa_supplicant_set_suites(wpa_s, NULL, ssid,
 135                                               wpa_s->sme.assoc_req_ie,
 136                                               &wpa_s->sme.assoc_req_ie_len)) {
 137                         wpa_printf(MSG_WARNING, "SME: Failed to set WPA key "
 138                                    "management and encryption suites (no scan "
 139                                    "results)");
 140                         return;
 141                 }
 142 #ifdef CONFIG_WPS
 143         } else if (ssid->key_mgmt & WPA_KEY_MGMT_WPS) {
 144                 struct wpabuf *wps_ie;
 145                 wps_ie = wps_build_assoc_req_ie(wpas_wps_get_req_type(ssid));
 146                 if (wps_ie && wpabuf_len(wps_ie) <=
 147                     sizeof(wpa_s->sme.assoc_req_ie)) {
 148                         wpa_s->sme.assoc_req_ie_len = wpabuf_len(wps_ie);
 149                         os_memcpy(wpa_s->sme.assoc_req_ie, wpabuf_head(wps_ie),
 150                                   wpa_s->sme.assoc_req_ie_len);
 151                 } else
 152                         wpa_s->sme.assoc_req_ie_len = 0;
 153                 wpabuf_free(wps_ie);
 154                 wpa_supplicant_set_non_wpa_policy(wpa_s, ssid);
 155 #endif /* CONFIG_WPS */
 156         } else {
 157                 wpa_supplicant_set_non_wpa_policy(wpa_s, ssid);
 158                 wpa_s->sme.assoc_req_ie_len = 0;
 159         }
 160
 161 #ifdef CONFIG_IEEE80211R
 162         ie = wpa_bss_get_ie(bss, WLAN_EID_MOBILITY_DOMAIN);
 163         if (ie && ie[1] >= MOBILITY_DOMAIN_ID_LEN)
 164                 md = ie + 2;
 165         wpa_sm_set_ft_params(wpa_s->wpa, ie, ie ? 2 + ie[1] : 0);
 166         if (md) {
 167                 /* Prepare for the next transition */
 168                 wpa_ft_prepare_auth_request(wpa_s->wpa, ie);
 169         }
 170
 171         if (md && ssid->key_mgmt & (WPA_KEY_MGMT_FT_PSK |
 172                                     WPA_KEY_MGMT_FT_IEEE8021X)) {
 173                 if (wpa_s->sme.assoc_req_ie_len + 5 <
 174                     sizeof(wpa_s->sme.assoc_req_ie)) {
 175                         struct rsn_mdie *mdie;
 176                         u8 *pos = wpa_s->sme.assoc_req_ie +
 177                                 wpa_s->sme.assoc_req_ie_len;
 178                         *pos++ = WLAN_EID_MOBILITY_DOMAIN;
 179                         *pos++ = sizeof(*mdie);
 180                         mdie = (struct rsn_mdie *) pos;
 181                         os_memcpy(mdie->mobility_domain, md,
 182                                   MOBILITY_DOMAIN_ID_LEN);
 183                         mdie->ft_capab = md[MOBILITY_DOMAIN_ID_LEN];
 184                         wpa_s->sme.assoc_req_ie_len += 5;
 185                 }
 186
 187                 if (wpa_s->sme.ft_used &&
 188                     os_memcmp(md, wpa_s->sme.mobility_domain, 2) == 0 &&
 189                     wpa_sm_has_ptk(wpa_s->wpa)) {
 190                         wpa_printf(MSG_DEBUG, "SME: Trying to use FT "
 191                                    "over-the-air");
 192                         params.auth_alg = WPA_AUTH_ALG_FT;
 193                         params.ie = wpa_s->sme.ft_ies;
 194                         params.ie_len = wpa_s->sme.ft_ies_len;
 195                 }
 196         }
 197 #endif /* CONFIG_IEEE80211R */
 198
 199 #ifdef CONFIG_IEEE80211W
 200         wpa_s->sme.mfp = ssid->ieee80211w;
 201         if (ssid->ieee80211w != NO_MGMT_FRAME_PROTECTION) {
 202                 const u8 *rsn = wpa_bss_get_ie(bss, WLAN_EID_RSN);
 203                 struct wpa_ie_data _ie;
 204                 if (rsn && wpa_parse_wpa_ie(rsn, 2 + rsn[1], &_ie) == 0 &&
 205                     _ie.capabilities &
 206                     (WPA_CAPABILITY_MFPC | WPA_CAPABILITY_MFPR)) {
 207                         wpa_printf(MSG_DEBUG, "WPA: Selected AP supports MFP: "
 208                                    "require MFP");
 209                         wpa_s->sme.mfp = MGMT_FRAME_PROTECTION_REQUIRED;
 210                 }
 211         }
 212 #endif /* CONFIG_IEEE80211W */
 213
 214 #ifdef CONFIG_P2P
 215         if (wpa_s->global->p2p) {
 216                 u8 *pos;
 217                 size_t len;
 218                 int res;
 219                 int p2p_group;
 220                 p2p_group = wpa_s->drv_flags & WPA_DRIVER_FLAGS_P2P_CAPABLE;
 221                 pos = wpa_s->sme.assoc_req_ie + wpa_s->sme.assoc_req_ie_len;
 222                 len = sizeof(wpa_s->sme.assoc_req_ie) -
 223                         wpa_s->sme.assoc_req_ie_len;
 224                 res = wpas_p2p_assoc_req_ie(wpa_s, bss, pos, len, p2p_group);
 225                 if (res >= 0)
 226                         wpa_s->sme.assoc_req_ie_len += res;
 227         }
 228 #endif /* CONFIG_P2P */
 229
 230         wpa_supplicant_cancel_scan(wpa_s);
 231
 232         wpa_msg(wpa_s, MSG_INFO, "Trying to authenticate with " MACSTR
 233                 " (SSID='%s' freq=%d MHz)", MAC2STR(params.bssid),
 234                 wpa_ssid_txt(params.ssid, params.ssid_len), params.freq);
 235
 236         wpa_clear_keys(wpa_s, bss->bssid);
 237         wpa_supplicant_set_state(wpa_s, WPA_AUTHENTICATING);
 238         old_ssid = wpa_s->current_ssid;
 239         wpa_s->current_ssid = ssid;
 240         wpa_supplicant_rsn_supp_set_config(wpa_s, wpa_s->current_ssid);
 241         wpa_supplicant_initiate_eapol(wpa_s);
 242         if (old_ssid != wpa_s->current_ssid)
 243                 wpas_notify_network_changed(wpa_s);
 244
 245         wpa_s->sme.auth_alg = params.auth_alg;
 246         if (wpa_drv_authenticate(wpa_s, &params) < 0) {
 247                 wpa_msg(wpa_s, MSG_INFO, "Authentication request to the "
 248                         "driver failed");
 249                 wpa_supplicant_req_scan(wpa_s, 1, 0);
 250                 return;
 251         }
 252
 253         /* TODO: add timeout on authentication */
 254
 255         /*
 256          * Association will be started based on the authentication event from
 257          * the driver.
 258          */
 259 }
 260
 261
 262 void sme_event_auth(struct wpa_supplicant *wpa_s, union wpa_event_data *data)
 263 {
 264         struct wpa_ssid *ssid = wpa_s->current_ssid;
 265
 266         if (ssid == NULL) {
 267                 wpa_printf(MSG_DEBUG, "SME: Ignore authentication event when "
 268                            "network is not selected");
 269                 return;
 270         }
 271
 272         if (wpa_s->wpa_state != WPA_AUTHENTICATING) {
 273                 wpa_printf(MSG_DEBUG, "SME: Ignore authentication event when "
 274                            "not in authenticating state");
 275                 return;
 276         }
 277
 278         if (os_memcmp(wpa_s->pending_bssid, data->auth.peer, ETH_ALEN) != 0) {
 279                 wpa_printf(MSG_DEBUG, "SME: Ignore authentication with "
 280                            "unexpected peer " MACSTR,
 281                            MAC2STR(data->auth.peer));
 282                 return;
 283         }
 284
 285         wpa_printf(MSG_DEBUG, "SME: Authentication response: peer=" MACSTR
 286                    " auth_type=%d status_code=%d",
 287                    MAC2STR(data->auth.peer), data->auth.auth_type,
 288                    data->auth.status_code);
 289         wpa_hexdump(MSG_MSGDUMP, "SME: Authentication response IEs",
 290                     data->auth.ies, data->auth.ies_len);
 291
 292         if (data->auth.status_code != WLAN_STATUS_SUCCESS) {
 293                 wpa_printf(MSG_DEBUG, "SME: Authentication failed (status "
 294                            "code %d)", data->auth.status_code);
 295
 296                 if (data->auth.status_code !=
 297                     WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG ||
 298                     wpa_s->sme.auth_alg == data->auth.auth_type ||
 299                     wpa_s->current_ssid->auth_alg == WPA_AUTH_ALG_LEAP) {
 300                         wpas_connection_failed(wpa_s, wpa_s->pending_bssid);
 301                         return;
 302                 }
 303
 304                 switch (data->auth.auth_type) {
 305                 case WLAN_AUTH_OPEN:
 306                         wpa_s->current_ssid->auth_alg = WPA_AUTH_ALG_SHARED;
 307
 308                         wpa_printf(MSG_DEBUG, "SME: Trying SHARED auth");
 309                         wpa_supplicant_associate(wpa_s, wpa_s->current_bss,
 310                                                  wpa_s->current_ssid);
 311                         return;
 312
 313                 case WLAN_AUTH_SHARED_KEY:
 314                         wpa_s->current_ssid->auth_alg = WPA_AUTH_ALG_LEAP;
 315
 316                         wpa_printf(MSG_DEBUG, "SME: Trying LEAP auth");
 317                         wpa_supplicant_associate(wpa_s, wpa_s->current_bss,
 318                                                  wpa_s->current_ssid);
 319                         return;
 320
 321                 default:
 322                         return;
 323                 }
 324         }
 325
 326 #ifdef CONFIG_IEEE80211R
 327         if (data->auth.auth_type == WLAN_AUTH_FT) {
 328                 union wpa_event_data edata;
 329                 os_memset(&edata, 0, sizeof(edata));
 330                 edata.ft_ies.ies = data->auth.ies;
 331                 edata.ft_ies.ies_len = data->auth.ies_len;
 332                 os_memcpy(edata.ft_ies.target_ap, data->auth.peer, ETH_ALEN);
 333                 wpa_supplicant_event(wpa_s, EVENT_FT_RESPONSE, &edata);
 334         }
 335 #endif /* CONFIG_IEEE80211R */
 336
 337         sme_associate(wpa_s, ssid->mode, data->auth.peer,
 338                       data->auth.auth_type);
 339 }
 340
 341
 342 void sme_associate(struct wpa_supplicant *wpa_s, enum wpas_mode mode,
 343                    const u8 *bssid, u16 auth_type)
 344 {
 345         struct wpa_driver_associate_params params;
 346         struct ieee802_11_elems elems;
 347
 348         os_memset(&params, 0, sizeof(params));
 349         params.bssid = bssid;
 350         params.ssid = wpa_s->sme.ssid;
 351         params.ssid_len = wpa_s->sme.ssid_len;
 352         params.freq = wpa_s->sme.freq;
 353         params.wpa_ie = wpa_s->sme.assoc_req_ie_len ?
 354                 wpa_s->sme.assoc_req_ie : NULL;
 355         params.wpa_ie_len = wpa_s->sme.assoc_req_ie_len;
 356         params.pairwise_suite = cipher_suite2driver(wpa_s->pairwise_cipher);
 357         params.group_suite = cipher_suite2driver(wpa_s->group_cipher);
 358 #ifdef CONFIG_IEEE80211R
 359         if (auth_type == WLAN_AUTH_FT && wpa_s->sme.ft_ies) {
 360                 params.wpa_ie = wpa_s->sme.ft_ies;
 361                 params.wpa_ie_len = wpa_s->sme.ft_ies_len;
 362         }
 363 #endif /* CONFIG_IEEE80211R */
 364         params.mode = mode;
 365         params.mgmt_frame_protection = wpa_s->sme.mfp;
 366         if (wpa_s->sme.prev_bssid_set)
 367                 params.prev_bssid = wpa_s->sme.prev_bssid;
 368
 369         wpa_msg(wpa_s, MSG_INFO, "Trying to associate with " MACSTR
 370                 " (SSID='%s' freq=%d MHz)", MAC2STR(params.bssid),
 371                 params.ssid ? wpa_ssid_txt(params.ssid, params.ssid_len) : "",
 372                 params.freq);
 373
 374         wpa_supplicant_set_state(wpa_s, WPA_ASSOCIATING);
 375
 376         if (params.wpa_ie == NULL ||
 377             ieee802_11_parse_elems(params.wpa_ie, params.wpa_ie_len, &elems, 0)
 378             < 0) {
 379                 wpa_printf(MSG_DEBUG, "SME: Could not parse own IEs?!");
 380                 os_memset(&elems, 0, sizeof(elems));
 381         }
 382         if (elems.rsn_ie)
 383                 wpa_sm_set_assoc_wpa_ie(wpa_s->wpa, elems.rsn_ie - 2,
 384                                         elems.rsn_ie_len + 2);
 385         else if (elems.wpa_ie)
 386                 wpa_sm_set_assoc_wpa_ie(wpa_s->wpa, elems.wpa_ie - 2,
 387                                         elems.wpa_ie_len + 2);
 388         else
 389                 wpa_sm_set_assoc_wpa_ie(wpa_s->wpa, NULL, 0);
 390         if (elems.p2p &&
 391             (wpa_s->drv_flags & WPA_DRIVER_FLAGS_P2P_CAPABLE))
 392                 params.p2p = 1;
 393
 394         if (wpa_s->parent->set_sta_uapsd)
 395                 params.uapsd = wpa_s->parent->sta_uapsd;
 396         else
 397                 params.uapsd = -1;
 398
 399         if (wpa_drv_associate(wpa_s, &params) < 0) {
 400                 wpa_msg(wpa_s, MSG_INFO, "Association request to the driver "
 401                         "failed");
 402                 wpas_connection_failed(wpa_s, wpa_s->pending_bssid);
 403                 os_memset(wpa_s->pending_bssid, 0, ETH_ALEN);
 404                 return;
 405         }
 406
 407         /* TODO: add timeout on association */
 408 }
 409
 410
 411 int sme_update_ft_ies(struct wpa_supplicant *wpa_s, const u8 *md,
 412                       const u8 *ies, size_t ies_len)
 413 {
 414         if (md == NULL || ies == NULL) {
 415                 wpa_printf(MSG_DEBUG, "SME: Remove mobility domain");
 416                 os_free(wpa_s->sme.ft_ies);
 417                 wpa_s->sme.ft_ies = NULL;
 418                 wpa_s->sme.ft_ies_len = 0;
 419                 wpa_s->sme.ft_used = 0;
 420                 return 0;
 421         }
 422
 423         os_memcpy(wpa_s->sme.mobility_domain, md, MOBILITY_DOMAIN_ID_LEN);
 424         wpa_hexdump(MSG_DEBUG, "SME: FT IEs", ies, ies_len);
 425         os_free(wpa_s->sme.ft_ies);
 426         wpa_s->sme.ft_ies = os_malloc(ies_len);
 427         if (wpa_s->sme.ft_ies == NULL)
 428                 return -1;
 429         os_memcpy(wpa_s->sme.ft_ies, ies, ies_len);
 430         wpa_s->sme.ft_ies_len = ies_len;
 431         return 0;
 432 }
 433
 434
 435 void sme_event_assoc_reject(struct wpa_supplicant *wpa_s,
 436                             union wpa_event_data *data)
 437 {
 438         int bssid_changed;
 439
 440         wpa_printf(MSG_DEBUG, "SME: Association with " MACSTR " failed: "
 441                    "status code %d", MAC2STR(wpa_s->pending_bssid),
 442                    data->assoc_reject.status_code);
 443
 444         bssid_changed = !is_zero_ether_addr(wpa_s->bssid);
 445
 446         /*
 447          * For now, unconditionally terminate the previous authentication. In
 448          * theory, this should not be needed, but mac80211 gets quite confused
 449          * if the authentication is left pending.. Some roaming cases might
 450          * benefit from using the previous authentication, so this could be
 451          * optimized in the future.
 452          */
 453         if (wpa_drv_deauthenticate(wpa_s, wpa_s->pending_bssid,
 454                                    WLAN_REASON_DEAUTH_LEAVING) < 0) {
 455                 wpa_msg(wpa_s, MSG_INFO,
 456                         "Deauth request to the driver failed");
 457         }
 458         wpa_s->sme.prev_bssid_set = 0;
 459
 460         wpas_connection_failed(wpa_s, wpa_s->pending_bssid);
 461         wpa_supplicant_set_state(wpa_s, WPA_DISCONNECTED);
 462         os_memset(wpa_s->bssid, 0, ETH_ALEN);
 463         os_memset(wpa_s->pending_bssid, 0, ETH_ALEN);
 464         if (bssid_changed)
 465                 wpas_notify_bssid_changed(wpa_s);
 466 }
 467
 468
 469 void sme_event_auth_timed_out(struct wpa_supplicant *wpa_s,
 470                               union wpa_event_data *data)
 471 {
 472         wpa_printf(MSG_DEBUG, "SME: Authentication timed out");
 473         wpas_connection_failed(wpa_s, wpa_s->pending_bssid);
 474 }
 475
 476
 477 void sme_event_assoc_timed_out(struct wpa_supplicant *wpa_s,
 478                                union wpa_event_data *data)
 479 {
 480         wpa_printf(MSG_DEBUG, "SME: Association timed out");
 481         wpas_connection_failed(wpa_s, wpa_s->pending_bssid);
 482         wpa_supplicant_mark_disassoc(wpa_s);
 483 }
 484
 485
 486 void sme_event_disassoc(struct wpa_supplicant *wpa_s,
 487                         union wpa_event_data *data)
 488 {
 489         wpa_printf(MSG_DEBUG, "SME: Disassociation event received");
 490         if (wpa_s->sme.prev_bssid_set &&
 491             !(wpa_s->drv_flags & WPA_DRIVER_FLAGS_USER_SPACE_MLME)) {
 492                 /*
 493                  * cfg80211/mac80211 can get into somewhat confused state if
 494                  * the AP only disassociates us and leaves us in authenticated
 495                  * state. For now, force the state to be cleared to avoid
 496                  * confusing errors if we try to associate with the AP again.
 497                  */
 498                 wpa_printf(MSG_DEBUG, "SME: Deauthenticate to clear driver "
 499                            "state");
 500                 wpa_drv_deauthenticate(wpa_s, wpa_s->sme.prev_bssid,
 501                                        WLAN_REASON_DEAUTH_LEAVING);
 502         }
 503 }
 504
 505
 506 #ifdef CONFIG_IEEE80211W
 507
 508 static const unsigned int sa_query_max_timeout = 1000;
 509 static const unsigned int sa_query_retry_timeout = 201;
 510
 511 static int sme_check_sa_query_timeout(struct wpa_supplicant *wpa_s)
 512 {
 513         u32 tu;
 514         struct os_time now, passed;
 515         os_get_time(&now);
 516         os_time_sub(&now, &wpa_s->sme.sa_query_start, &passed);
 517         tu = (passed.sec * 1000000 + passed.usec) / 1024;
 518         if (sa_query_max_timeout < tu) {
 519                 wpa_printf(MSG_DEBUG, "SME: SA Query timed out");
 520                 sme_stop_sa_query(wpa_s);
 521                 wpa_supplicant_deauthenticate(
 522                         wpa_s, WLAN_REASON_PREV_AUTH_NOT_VALID);
 523                 return 1;
 524         }
 525
 526         return 0;
 527 }
 528
 529
 530 static void sme_send_sa_query_req(struct wpa_supplicant *wpa_s,
 531                                   const u8 *trans_id)
 532 {
 533         u8 req[2 + WLAN_SA_QUERY_TR_ID_LEN];
 534         wpa_printf(MSG_DEBUG, "SME: Sending SA Query Request to "
 535                    MACSTR, MAC2STR(wpa_s->bssid));
 536         wpa_hexdump(MSG_DEBUG, "SME: SA Query Transaction ID",
 537                     trans_id, WLAN_SA_QUERY_TR_ID_LEN);
 538         req[0] = WLAN_ACTION_SA_QUERY;
 539         req[1] = WLAN_SA_QUERY_REQUEST;
 540         os_memcpy(req + 2, trans_id, WLAN_SA_QUERY_TR_ID_LEN);
 541         if (wpa_drv_send_action(wpa_s, wpa_s->assoc_freq, wpa_s->bssid,
 542                                 wpa_s->own_addr, wpa_s->bssid,
 543                                 req, sizeof(req)) < 0)
 544                 wpa_printf(MSG_INFO, "SME: Failed to send SA Query Request");
 545 }
 546
 547
 548 static void sme_sa_query_timer(void *eloop_ctx, void *timeout_ctx)
 549 {
 550         struct wpa_supplicant *wpa_s = eloop_ctx;
 551         unsigned int timeout, sec, usec;
 552         u8 *trans_id, *nbuf;
 553
 554         if (wpa_s->sme.sa_query_count > 0 &&
 555             sme_check_sa_query_timeout(wpa_s))
 556                 return;
 557
 558         nbuf = os_realloc(wpa_s->sme.sa_query_trans_id,
 559                           (wpa_s->sme.sa_query_count + 1) *
 560                           WLAN_SA_QUERY_TR_ID_LEN);
 561         if (nbuf == NULL)
 562                 return;
 563         if (wpa_s->sme.sa_query_count == 0) {
 564                 /* Starting a new SA Query procedure */
 565                 os_get_time(&wpa_s->sme.sa_query_start);
 566         }
 567         trans_id = nbuf + wpa_s->sme.sa_query_count * WLAN_SA_QUERY_TR_ID_LEN;
 568         wpa_s->sme.sa_query_trans_id = nbuf;
 569         wpa_s->sme.sa_query_count++;
 570
 571         os_get_random(trans_id, WLAN_SA_QUERY_TR_ID_LEN);
 572
 573         timeout = sa_query_retry_timeout;
 574         sec = ((timeout / 1000) * 1024) / 1000;
 575         usec = (timeout % 1000) * 1024;
 576         eloop_register_timeout(sec, usec, sme_sa_query_timer, wpa_s, NULL);
 577
 578         wpa_printf(MSG_DEBUG, "SME: Association SA Query attempt %d",
 579                    wpa_s->sme.sa_query_count);
 580
 581         sme_send_sa_query_req(wpa_s, trans_id);
 582 }
 583
 584
 585 static void sme_start_sa_query(struct wpa_supplicant *wpa_s)
 586 {
 587         sme_sa_query_timer(wpa_s, NULL);
 588 }
 589
 590
 591 void sme_stop_sa_query(struct wpa_supplicant *wpa_s)
 592 {
 593         eloop_cancel_timeout(sme_sa_query_timer, wpa_s, NULL);
 594         os_free(wpa_s->sme.sa_query_trans_id);
 595         wpa_s->sme.sa_query_trans_id = NULL;
 596         wpa_s->sme.sa_query_count = 0;
 597 }
 598
 599
 600 void sme_event_unprot_disconnect(struct wpa_supplicant *wpa_s, const u8 *sa,
 601                                  const u8 *da, u16 reason_code)
 602 {
 603         struct wpa_ssid *ssid;
 604
 605         if (!(wpa_s->drv_flags & WPA_DRIVER_FLAGS_SME))
 606                 return;
 607         if (wpa_s->wpa_state != WPA_COMPLETED)
 608                 return;
 609         ssid = wpa_s->current_ssid;
 610         if (ssid == NULL || ssid->ieee80211w == 0)
 611                 return;
 612         if (os_memcmp(sa, wpa_s->bssid, ETH_ALEN) != 0)
 613                 return;
 614         if (reason_code != WLAN_REASON_CLASS2_FRAME_FROM_NONAUTH_STA &&
 615             reason_code != WLAN_REASON_CLASS3_FRAME_FROM_NONASSOC_STA)
 616                 return;
 617         if (wpa_s->sme.sa_query_count > 0)
 618                 return;
 619
 620         wpa_printf(MSG_DEBUG, "SME: Unprotected disconnect dropped - possible "
 621                    "AP/STA state mismatch - trigger SA Query");
 622         sme_start_sa_query(wpa_s);
 623 }
 624
 625
 626 void sme_sa_query_rx(struct wpa_supplicant *wpa_s, const u8 *sa,
 627                      const u8 *data, size_t len)
 628 {
 629         int i;
 630
 631         if (wpa_s->sme.sa_query_trans_id == NULL ||
 632             len < 1 + WLAN_SA_QUERY_TR_ID_LEN ||
 633             data[0] != WLAN_SA_QUERY_RESPONSE)
 634                 return;
 635         wpa_printf(MSG_DEBUG, "SME: Received SA Query response from " MACSTR
 636                    " (trans_id %02x%02x)",
 637                    MAC2STR(sa), data[1], data[2]);
 638
 639         if (os_memcmp(sa, wpa_s->bssid, ETH_ALEN) != 0)
 640                 return;
 641
 642         for (i = 0; i < wpa_s->sme.sa_query_count; i++) {
 643                 if (os_memcmp(wpa_s->sme.sa_query_trans_id +
 644                               i * WLAN_SA_QUERY_TR_ID_LEN,
 645                               data + 1, WLAN_SA_QUERY_TR_ID_LEN) == 0)
 646                         break;
 647         }
 648
 649         if (i >= wpa_s->sme.sa_query_count) {
 650                 wpa_printf(MSG_DEBUG, "SME: No matching SA Query "
 651                            "transaction identifier found");
 652                 return;
 653         }
 654
 655         wpa_printf(MSG_DEBUG, "SME: Reply to pending SA Query received from "
 656                    MACSTR, MAC2STR(sa));
 657         sme_stop_sa_query(wpa_s);
 658 }
 659
 660 #endif /* CONFIG_IEEE80211W */