net/wireless/sme.c

   1 /*
   2  * SME code for cfg80211's connect emulation.
   3  *
   4  * Copyright 2009       Johannes Berg <johannes@sipsolutions.net>
   5  * Copyright (C) 2009   Intel Corporation. All rights reserved.
   6  */
   7
   8 #include <linux/etherdevice.h>
   9 #include <linux/if_arp.h>
  10 #include <linux/workqueue.h>
  11 #include <net/cfg80211.h>
  12 #include <net/rtnetlink.h>
  13 #include "nl80211.h"
  14
  15 struct cfg80211_conn {
  16         struct cfg80211_connect_params params;
  17         /* these are sub-states of the _CONNECTING sme_state */
  18         enum {
  19                 CFG80211_CONN_IDLE,
  20                 CFG80211_CONN_SCANNING,
  21                 CFG80211_CONN_SCAN_AGAIN,
  22                 CFG80211_CONN_AUTHENTICATE_NEXT,
  23                 CFG80211_CONN_AUTHENTICATING,
  24                 CFG80211_CONN_ASSOCIATE_NEXT,
  25                 CFG80211_CONN_ASSOCIATING,
  26         } state;
  27         u8 bssid[ETH_ALEN];
  28         u8 *ie;
  29         size_t ie_len;
  30         bool auto_auth;
  31 };
  32
  33
  34 static int cfg80211_conn_scan(struct wireless_dev *wdev)
  35 {
  36         struct cfg80211_registered_device *drv = wiphy_to_dev(wdev->wiphy);
  37         struct cfg80211_scan_request *request;
  38         int n_channels, err;
  39
  40         ASSERT_RTNL();
  41
  42         if (drv->scan_req)
  43                 return -EBUSY;
  44
  45         if (wdev->conn->params.channel) {
  46                 n_channels = 1;
  47         } else {
  48                 enum ieee80211_band band;
  49                 n_channels = 0;
  50
  51                 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
  52                         if (!wdev->wiphy->bands[band])
  53                                 continue;
  54                         n_channels += wdev->wiphy->bands[band]->n_channels;
  55                 }
  56         }
  57         request = kzalloc(sizeof(*request) + sizeof(request->ssids[0]) +
  58                           sizeof(request->channels[0]) * n_channels,
  59                           GFP_KERNEL);
  60         if (!request)
  61                 return -ENOMEM;
  62
  63         request->channels = (void *)((char *)request + sizeof(*request));
  64         if (wdev->conn->params.channel)
  65                 request->channels[0] = wdev->conn->params.channel;
  66         else {
  67                 int i = 0, j;
  68                 enum ieee80211_band band;
  69
  70                 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
  71                         if (!wdev->wiphy->bands[band])
  72                                 continue;
  73                         for (j = 0; j < wdev->wiphy->bands[band]->n_channels;
  74                              i++, j++)
  75                                 request->channels[i] =
  76                                         &wdev->wiphy->bands[band]->channels[j];
  77                 }
  78         }
  79         request->n_channels = n_channels;
  80         request->ssids = (void *)(request->channels + n_channels);
  81         request->n_ssids = 1;
  82
  83         memcpy(request->ssids[0].ssid, wdev->conn->params.ssid,
  84                 wdev->conn->params.ssid_len);
  85         request->ssids[0].ssid_len = wdev->conn->params.ssid_len;
  86
  87         request->ifidx = wdev->netdev->ifindex;
  88         request->wiphy = &drv->wiphy;
  89
  90         drv->scan_req = request;
  91
  92         err = drv->ops->scan(wdev->wiphy, wdev->netdev, request);
  93         if (!err) {
  94                 wdev->conn->state = CFG80211_CONN_SCANNING;
  95                 nl80211_send_scan_start(drv, wdev->netdev);
  96         } else {
  97                 drv->scan_req = NULL;
  98                 kfree(request);
  99         }
 100         return err;
 101 }
 102
 103 static int cfg80211_conn_do_work(struct wireless_dev *wdev)
 104 {
 105         struct cfg80211_registered_device *drv = wiphy_to_dev(wdev->wiphy);
 106         struct cfg80211_connect_params *params;
 107         int err;
 108
 109         if (!wdev->conn)
 110                 return 0;
 111
 112         params = &wdev->conn->params;
 113
 114         switch (wdev->conn->state) {
 115         case CFG80211_CONN_SCAN_AGAIN:
 116                 return cfg80211_conn_scan(wdev);
 117         case CFG80211_CONN_AUTHENTICATE_NEXT:
 118                 BUG_ON(!drv->ops->auth);
 119                 wdev->conn->state = CFG80211_CONN_AUTHENTICATING;
 120                 return cfg80211_mlme_auth(drv, wdev->netdev,
 121                                           params->channel, params->auth_type,
 122                                           params->bssid,
 123                                           params->ssid, params->ssid_len,
 124                                           NULL, 0);
 125         case CFG80211_CONN_ASSOCIATE_NEXT:
 126                 BUG_ON(!drv->ops->assoc);
 127                 wdev->conn->state = CFG80211_CONN_ASSOCIATING;
 128                 err = cfg80211_mlme_assoc(drv, wdev->netdev,
 129                                           params->channel, params->bssid,
 130                                           params->ssid, params->ssid_len,
 131                                           params->ie, params->ie_len,
 132                                           false, &params->crypto);
 133                 if (err)
 134                         cfg80211_mlme_deauth(drv, wdev->netdev, params->bssid,
 135                                              NULL, 0, WLAN_REASON_DEAUTH_LEAVING);
 136                 return err;
 137         default:
 138                 return 0;
 139         }
 140 }
 141
 142 void cfg80211_conn_work(struct work_struct *work)
 143 {
 144         struct cfg80211_registered_device *drv =
 145                 container_of(work, struct cfg80211_registered_device, conn_work);
 146         struct wireless_dev *wdev;
 147
 148         rtnl_lock();
 149         mutex_lock(&drv->devlist_mtx);
 150
 151         list_for_each_entry(wdev, &drv->netdev_list, list) {
 152                 if (!netif_running(wdev->netdev))
 153                         continue;
 154                 if (wdev->sme_state != CFG80211_SME_CONNECTING)
 155                         continue;
 156                 if (cfg80211_conn_do_work(wdev))
 157                         cfg80211_connect_result(wdev->netdev,
 158                                                 wdev->conn->params.bssid,
 159                                                 NULL, 0, NULL, 0,
 160                                                 WLAN_STATUS_UNSPECIFIED_FAILURE,
 161                                                 GFP_ATOMIC);
 162         }
 163
 164         mutex_unlock(&drv->devlist_mtx);
 165         rtnl_unlock();
 166 }
 167
 168 static bool cfg80211_get_conn_bss(struct wireless_dev *wdev)
 169 {
 170         struct cfg80211_registered_device *drv = wiphy_to_dev(wdev->wiphy);
 171         struct cfg80211_bss *bss;
 172         u16 capa = WLAN_CAPABILITY_ESS;
 173
 174         if (wdev->conn->params.privacy)
 175                 capa |= WLAN_CAPABILITY_PRIVACY;
 176
 177         bss = cfg80211_get_bss(wdev->wiphy, NULL, wdev->conn->params.bssid,
 178                                wdev->conn->params.ssid,
 179                                wdev->conn->params.ssid_len,
 180                                WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_PRIVACY,
 181                                capa);
 182         if (!bss)
 183                 return false;
 184
 185         memcpy(wdev->conn->bssid, bss->bssid, ETH_ALEN);
 186         wdev->conn->params.bssid = wdev->conn->bssid;
 187         wdev->conn->params.channel = bss->channel;
 188         wdev->conn->state = CFG80211_CONN_AUTHENTICATE_NEXT;
 189         schedule_work(&drv->conn_work);
 190
 191         cfg80211_put_bss(bss);
 192         return true;
 193 }
 194
 195 void cfg80211_sme_scan_done(struct net_device *dev)
 196 {
 197         struct wireless_dev *wdev = dev->ieee80211_ptr;
 198         struct cfg80211_registered_device *drv = wiphy_to_dev(wdev->wiphy);
 199
 200         if (wdev->sme_state != CFG80211_SME_CONNECTING)
 201                 return;
 202
 203         if (WARN_ON(!wdev->conn))
 204                 return;
 205
 206         if (wdev->conn->state != CFG80211_CONN_SCANNING &&
 207             wdev->conn->state != CFG80211_CONN_SCAN_AGAIN)
 208                 return;
 209
 210         if (!cfg80211_get_conn_bss(wdev)) {
 211                 /* not found */
 212                 if (wdev->conn->state == CFG80211_CONN_SCAN_AGAIN)
 213                         schedule_work(&drv->conn_work);
 214                 else
 215                         cfg80211_connect_result(dev, wdev->conn->params.bssid,
 216                                                 NULL, 0, NULL, 0,
 217                                                 WLAN_STATUS_UNSPECIFIED_FAILURE,
 218                                                 GFP_ATOMIC);
 219                 return;
 220         }
 221 }
 222
 223 void cfg80211_sme_rx_auth(struct net_device *dev, const u8 *buf, size_t len)
 224 {
 225         struct wireless_dev *wdev = dev->ieee80211_ptr;
 226         struct wiphy *wiphy = wdev->wiphy;
 227         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 228         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)buf;
 229         u16 status_code = le16_to_cpu(mgmt->u.auth.status_code);
 230
 231         /* should only RX auth frames when connecting */
 232         if (wdev->sme_state != CFG80211_SME_CONNECTING)
 233                 return;
 234
 235         if (WARN_ON(!wdev->conn))
 236                 return;
 237
 238         if (status_code == WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG &&
 239             wdev->conn->auto_auth &&
 240             wdev->conn->params.auth_type != NL80211_AUTHTYPE_NETWORK_EAP) {
 241                 /* select automatically between only open, shared, leap */
 242                 switch (wdev->conn->params.auth_type) {
 243                 case NL80211_AUTHTYPE_OPEN_SYSTEM:
 244                         wdev->conn->params.auth_type =
 245                                 NL80211_AUTHTYPE_SHARED_KEY;
 246                         break;
 247                 case NL80211_AUTHTYPE_SHARED_KEY:
 248                         wdev->conn->params.auth_type =
 249                                 NL80211_AUTHTYPE_NETWORK_EAP;
 250                         break;
 251                 default:
 252                         /* huh? */
 253                         wdev->conn->params.auth_type =
 254                                 NL80211_AUTHTYPE_OPEN_SYSTEM;
 255                         break;
 256                 }
 257                 wdev->conn->state = CFG80211_CONN_AUTHENTICATE_NEXT;
 258                 schedule_work(&rdev->conn_work);
 259         } else if (status_code != WLAN_STATUS_SUCCESS) {
 260                 wdev->sme_state = CFG80211_SME_IDLE;
 261                 kfree(wdev->conn);
 262                 wdev->conn = NULL;
 263         } else if (wdev->sme_state == CFG80211_SME_CONNECTING &&
 264                  wdev->conn->state == CFG80211_CONN_AUTHENTICATING) {
 265                 wdev->conn->state = CFG80211_CONN_ASSOCIATE_NEXT;
 266                 schedule_work(&rdev->conn_work);
 267         }
 268 }
 269
 270 static void __cfg80211_connect_result(struct net_device *dev, const u8 *bssid,
 271                                       const u8 *req_ie, size_t req_ie_len,
 272                                       const u8 *resp_ie, size_t resp_ie_len,
 273                                       u16 status, bool wextev, gfp_t gfp)
 274 {
 275         struct wireless_dev *wdev = dev->ieee80211_ptr;
 276         struct cfg80211_bss *bss;
 277 #ifdef CONFIG_WIRELESS_EXT
 278         union iwreq_data wrqu;
 279 #endif
 280
 281         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
 282                 return;
 283
 284         if (wdev->sme_state == CFG80211_SME_CONNECTED)
 285                 nl80211_send_roamed(wiphy_to_dev(wdev->wiphy), dev,
 286                                     bssid, req_ie, req_ie_len,
 287                                     resp_ie, resp_ie_len, gfp);
 288         else
 289                 nl80211_send_connect_result(wiphy_to_dev(wdev->wiphy), dev,
 290                                             bssid, req_ie, req_ie_len,
 291                                             resp_ie, resp_ie_len,
 292                                             status, gfp);
 293
 294 #ifdef CONFIG_WIRELESS_EXT
 295         if (wextev) {
 296                 if (req_ie && status == WLAN_STATUS_SUCCESS) {
 297                         memset(&wrqu, 0, sizeof(wrqu));
 298                         wrqu.data.length = req_ie_len;
 299                         wireless_send_event(dev, IWEVASSOCRESPIE, &wrqu, req_ie);
 300                 }
 301
 302                 if (resp_ie && status == WLAN_STATUS_SUCCESS) {
 303                         memset(&wrqu, 0, sizeof(wrqu));
 304                         wrqu.data.length = resp_ie_len;
 305                         wireless_send_event(dev, IWEVASSOCRESPIE, &wrqu, resp_ie);
 306                 }
 307
 308                 memset(&wrqu, 0, sizeof(wrqu));
 309                 wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 310                 if (bssid && status == WLAN_STATUS_SUCCESS)
 311                         memcpy(wrqu.ap_addr.sa_data, bssid, ETH_ALEN);
 312                 wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL);
 313         }
 314 #endif
 315
 316         if (status == WLAN_STATUS_SUCCESS &&
 317             wdev->sme_state == CFG80211_SME_IDLE) {
 318                 wdev->sme_state = CFG80211_SME_CONNECTED;
 319                 return;
 320         }
 321
 322         if (wdev->sme_state != CFG80211_SME_CONNECTING)
 323                 return;
 324
 325         if (wdev->current_bss) {
 326                 cfg80211_unhold_bss(wdev->current_bss);
 327                 cfg80211_put_bss(&wdev->current_bss->pub);
 328                 wdev->current_bss = NULL;
 329         }
 330
 331         if (wdev->conn)
 332                 wdev->conn->state = CFG80211_CONN_IDLE;
 333
 334         if (status == WLAN_STATUS_SUCCESS) {
 335                 bss = cfg80211_get_bss(wdev->wiphy, NULL, bssid,
 336                                        wdev->ssid, wdev->ssid_len,
 337                                        WLAN_CAPABILITY_ESS,
 338                                        WLAN_CAPABILITY_ESS);
 339
 340                 if (WARN_ON(!bss))
 341                         return;
 342
 343                 cfg80211_hold_bss(bss_from_pub(bss));
 344                 wdev->current_bss = bss_from_pub(bss);
 345
 346                 wdev->sme_state = CFG80211_SME_CONNECTED;
 347         } else {
 348                 wdev->sme_state = CFG80211_SME_IDLE;
 349                 kfree(wdev->conn);
 350                 wdev->conn = NULL;
 351         }
 352 }
 353
 354 void cfg80211_connect_result(struct net_device *dev, const u8 *bssid,
 355                              const u8 *req_ie, size_t req_ie_len,
 356                              const u8 *resp_ie, size_t resp_ie_len,
 357                              u16 status, gfp_t gfp)
 358 {
 359         bool wextev = status == WLAN_STATUS_SUCCESS;
 360         __cfg80211_connect_result(dev, bssid, req_ie, req_ie_len, resp_ie, resp_ie_len, status, wextev, gfp);
 361 }
 362 EXPORT_SYMBOL(cfg80211_connect_result);
 363
 364 void cfg80211_roamed(struct net_device *dev, const u8 *bssid,
 365                      const u8 *req_ie, size_t req_ie_len,
 366                      const u8 *resp_ie, size_t resp_ie_len, gfp_t gfp)
 367 {
 368         struct wireless_dev *wdev = dev->ieee80211_ptr;
 369         struct cfg80211_bss *bss;
 370 #ifdef CONFIG_WIRELESS_EXT
 371         union iwreq_data wrqu;
 372 #endif
 373
 374         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
 375                 return;
 376
 377         if (WARN_ON(wdev->sme_state != CFG80211_SME_CONNECTED))
 378                 return;
 379
 380         /* internal error -- how did we get to CONNECTED w/o BSS? */
 381         if (WARN_ON(!wdev->current_bss)) {
 382                 return;
 383         }
 384
 385         cfg80211_unhold_bss(wdev->current_bss);
 386         cfg80211_put_bss(&wdev->current_bss->pub);
 387         wdev->current_bss = NULL;
 388
 389         bss = cfg80211_get_bss(wdev->wiphy, NULL, bssid,
 390                                wdev->ssid, wdev->ssid_len,
 391                                WLAN_CAPABILITY_ESS, WLAN_CAPABILITY_ESS);
 392
 393         if (WARN_ON(!bss))
 394                 return;
 395
 396         cfg80211_hold_bss(bss_from_pub(bss));
 397         wdev->current_bss = bss_from_pub(bss);
 398
 399         nl80211_send_roamed(wiphy_to_dev(wdev->wiphy), dev, bssid,
 400                             req_ie, req_ie_len, resp_ie, resp_ie_len, gfp);
 401
 402 #ifdef CONFIG_WIRELESS_EXT
 403         if (req_ie) {
 404                 memset(&wrqu, 0, sizeof(wrqu));
 405                 wrqu.data.length = req_ie_len;
 406                 wireless_send_event(dev, IWEVASSOCRESPIE, &wrqu, req_ie);
 407         }
 408
 409         if (resp_ie) {
 410                 memset(&wrqu, 0, sizeof(wrqu));
 411                 wrqu.data.length = resp_ie_len;
 412                 wireless_send_event(dev, IWEVASSOCRESPIE, &wrqu, resp_ie);
 413         }
 414
 415         memset(&wrqu, 0, sizeof(wrqu));
 416         wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 417         memcpy(wrqu.ap_addr.sa_data, bssid, ETH_ALEN);
 418         wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL);
 419 #endif
 420 }
 421 EXPORT_SYMBOL(cfg80211_roamed);
 422
 423 void __cfg80211_disconnected(struct net_device *dev, gfp_t gfp, u8 *ie,
 424                              size_t ie_len, u16 reason, bool from_ap)
 425 {
 426         struct wireless_dev *wdev = dev->ieee80211_ptr;
 427 #ifdef CONFIG_WIRELESS_EXT
 428         union iwreq_data wrqu;
 429 #endif
 430
 431         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
 432                 return;
 433
 434         if (WARN_ON(wdev->sme_state != CFG80211_SME_CONNECTED))
 435                 return;
 436
 437         if (wdev->current_bss) {
 438                 cfg80211_unhold_bss(wdev->current_bss);
 439                 cfg80211_put_bss(&wdev->current_bss->pub);
 440         }
 441
 442         wdev->current_bss = NULL;
 443         wdev->sme_state = CFG80211_SME_IDLE;
 444
 445         if (wdev->conn) {
 446                 kfree(wdev->conn->ie);
 447                 wdev->conn->ie = NULL;
 448                 kfree(wdev->conn);
 449                 wdev->conn = NULL;
 450         }
 451
 452         nl80211_send_disconnected(wiphy_to_dev(wdev->wiphy), dev,
 453                                   reason, ie, ie_len, from_ap, gfp);
 454
 455 #ifdef CONFIG_WIRELESS_EXT
 456         memset(&wrqu, 0, sizeof(wrqu));
 457         wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 458         wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL);
 459 #endif
 460 }
 461
 462 void cfg80211_disconnected(struct net_device *dev, u16 reason,
 463                            u8 *ie, size_t ie_len, gfp_t gfp)
 464 {
 465         __cfg80211_disconnected(dev, gfp, ie, ie_len, reason, true);
 466 }
 467 EXPORT_SYMBOL(cfg80211_disconnected);
 468
 469 int cfg80211_connect(struct cfg80211_registered_device *rdev,
 470                      struct net_device *dev,
 471                      struct cfg80211_connect_params *connect)
 472 {
 473         int err;
 474         struct wireless_dev *wdev = dev->ieee80211_ptr;
 475
 476         if (wdev->sme_state != CFG80211_SME_IDLE)
 477                 return -EALREADY;
 478
 479         if (!rdev->ops->connect) {
 480                 if (!rdev->ops->auth || !rdev->ops->assoc)
 481                         return -EOPNOTSUPP;
 482
 483                 if (WARN_ON(wdev->conn))
 484                         return -EINPROGRESS;
 485
 486                 wdev->conn = kzalloc(sizeof(*wdev->conn), GFP_KERNEL);
 487                 if (!wdev->conn)
 488                         return -ENOMEM;
 489
 490                 /*
 491                  * Copy all parameters, and treat explicitly IEs, BSSID, SSID.
 492                  */
 493                 memcpy(&wdev->conn->params, connect, sizeof(*connect));
 494                 if (connect->bssid) {
 495                         wdev->conn->params.bssid = wdev->conn->bssid;
 496                         memcpy(wdev->conn->bssid, connect->bssid, ETH_ALEN);
 497                 }
 498
 499                 if (connect->ie) {
 500                         wdev->conn->ie = kmemdup(connect->ie, connect->ie_len,
 501                                                 GFP_KERNEL);
 502                         wdev->conn->params.ie = wdev->conn->ie;
 503                         if (!wdev->conn->ie) {
 504                                 kfree(wdev->conn);
 505                                 wdev->conn = NULL;
 506                                 return -ENOMEM;
 507                         }
 508                 }
 509
 510                 if (connect->auth_type == NL80211_AUTHTYPE_AUTOMATIC) {
 511                         wdev->conn->auto_auth = true;
 512                         /* start with open system ... should mostly work */
 513                         wdev->conn->params.auth_type =
 514                                 NL80211_AUTHTYPE_OPEN_SYSTEM;
 515                 } else {
 516                         wdev->conn->auto_auth = false;
 517                 }
 518
 519                 memcpy(wdev->ssid, connect->ssid, connect->ssid_len);
 520                 wdev->ssid_len = connect->ssid_len;
 521                 wdev->conn->params.ssid = wdev->ssid;
 522                 wdev->conn->params.ssid_len = connect->ssid_len;
 523
 524                 /* don't care about result -- but fill bssid & channel */
 525                 if (!wdev->conn->params.bssid || !wdev->conn->params.channel)
 526                         cfg80211_get_conn_bss(wdev);
 527
 528                 wdev->sme_state = CFG80211_SME_CONNECTING;
 529
 530                 /* we're good if we have both BSSID and channel */
 531                 if (wdev->conn->params.bssid && wdev->conn->params.channel) {
 532                         wdev->conn->state = CFG80211_CONN_AUTHENTICATE_NEXT;
 533                         err = cfg80211_conn_do_work(wdev);
 534                 } else {
 535                         /* otherwise we'll need to scan for the AP first */
 536                         err = cfg80211_conn_scan(wdev);
 537                         /*
 538                          * If we can't scan right now, then we need to scan again
 539                          * after the current scan finished, since the parameters
 540                          * changed (unless we find a good AP anyway).
 541                          */
 542                         if (err == -EBUSY) {
 543                                 err = 0;
 544                                 wdev->conn->state = CFG80211_CONN_SCAN_AGAIN;
 545                         }
 546                 }
 547                 if (err) {
 548                         kfree(wdev->conn);
 549                         wdev->conn = NULL;
 550                         wdev->sme_state = CFG80211_SME_IDLE;
 551                 }
 552
 553                 return err;
 554         } else {
 555                 wdev->sme_state = CFG80211_SME_CONNECTING;
 556                 err = rdev->ops->connect(&rdev->wiphy, dev, connect);
 557                 if (err) {
 558                         wdev->sme_state = CFG80211_SME_IDLE;
 559                         return err;
 560                 }
 561
 562                 memcpy(wdev->ssid, connect->ssid, connect->ssid_len);
 563                 wdev->ssid_len = connect->ssid_len;
 564
 565                 return 0;
 566         }
 567 }
 568
 569 int cfg80211_disconnect(struct cfg80211_registered_device *rdev,
 570                         struct net_device *dev, u16 reason, bool wextev)
 571 {
 572         struct wireless_dev *wdev = dev->ieee80211_ptr;
 573         int err;
 574
 575         if (wdev->sme_state == CFG80211_SME_IDLE)
 576                 return -EINVAL;
 577
 578         if (!rdev->ops->disconnect) {
 579                 if (!rdev->ops->deauth)
 580                         return -EOPNOTSUPP;
 581
 582                 /* was it connected by userspace SME? */
 583                 if (!wdev->conn) {
 584                         cfg80211_mlme_down(rdev, dev);
 585                         return 0;
 586                 }
 587
 588                 if (wdev->sme_state == CFG80211_SME_CONNECTING &&
 589                     (wdev->conn->state == CFG80211_CONN_SCANNING ||
 590                      wdev->conn->state == CFG80211_CONN_SCAN_AGAIN)) {
 591                         wdev->sme_state = CFG80211_SME_IDLE;
 592                         kfree(wdev->conn);
 593                         wdev->conn = NULL;
 594                         return 0;
 595                 }
 596
 597                 /* wdev->conn->params.bssid must be set if > SCANNING */
 598                 err = cfg80211_mlme_deauth(rdev, dev, wdev->conn->params.bssid,
 599                                            NULL, 0, reason);
 600                 if (err)
 601                         return err;
 602         } else {
 603                 err = rdev->ops->disconnect(&rdev->wiphy, dev, reason);
 604                 if (err)
 605                         return err;
 606         }
 607
 608         if (wdev->sme_state == CFG80211_SME_CONNECTED)
 609                 __cfg80211_disconnected(dev, GFP_KERNEL, NULL, 0, 0, false);
 610         else if (wdev->sme_state == CFG80211_SME_CONNECTING)
 611                 __cfg80211_connect_result(dev, NULL, NULL, 0, NULL, 0,
 612                                           WLAN_STATUS_UNSPECIFIED_FAILURE,
 613                                           wextev, GFP_KERNEL);
 614
 615         return 0;
 616 }
 617
 618 void cfg80211_sme_disassoc(struct net_device *dev, int idx)
 619 {
 620         struct wireless_dev *wdev = dev->ieee80211_ptr;
 621         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 622         u8 bssid[ETH_ALEN];
 623
 624         if (!wdev->conn)
 625                 return;
 626
 627         if (wdev->conn->state == CFG80211_CONN_IDLE)
 628                 return;
 629
 630         /*
 631          * Ok, so the association was made by this SME -- we don't
 632          * want it any more so deauthenticate too.
 633          */
 634
 635         if (!wdev->auth_bsses[idx])
 636                 return;
 637
 638         memcpy(bssid, wdev->auth_bsses[idx]->pub.bssid, ETH_ALEN);
 639         if (cfg80211_mlme_deauth(rdev, dev, bssid,
 640                                  NULL, 0, WLAN_REASON_DEAUTH_LEAVING)) {
 641                 /* whatever -- assume gone anyway */
 642                 cfg80211_unhold_bss(wdev->auth_bsses[idx]);
 643                 cfg80211_put_bss(&wdev->auth_bsses[idx]->pub);
 644                 wdev->auth_bsses[idx] = NULL;
 645         }
 646 }