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         union {
 107                 struct cfg80211_auth_request auth_req;
 108                 struct cfg80211_assoc_request assoc_req;
 109         } u;
 110
 111         memset(&u, 0, sizeof(u));
 112
 113         if (!wdev->conn)
 114                 return 0;
 115
 116         switch (wdev->conn->state) {
 117         case CFG80211_CONN_SCAN_AGAIN:
 118                 return cfg80211_conn_scan(wdev);
 119         case CFG80211_CONN_AUTHENTICATE_NEXT:
 120                 u.auth_req.chan = wdev->conn->params.channel;
 121                 u.auth_req.peer_addr = wdev->conn->params.bssid;
 122                 u.auth_req.ssid = wdev->conn->params.ssid;
 123                 u.auth_req.ssid_len = wdev->conn->params.ssid_len;
 124                 u.auth_req.auth_type = wdev->conn->params.auth_type;
 125                 u.auth_req.ie = NULL;
 126                 u.auth_req.ie_len = 0;
 127                 wdev->conn->state = CFG80211_CONN_AUTHENTICATING;
 128                 BUG_ON(!drv->ops->auth);
 129                 return drv->ops->auth(wdev->wiphy, wdev->netdev, &u.auth_req);
 130         case CFG80211_CONN_ASSOCIATE_NEXT:
 131                 u.assoc_req.chan = wdev->conn->params.channel;
 132                 u.assoc_req.peer_addr = wdev->conn->params.bssid;
 133                 u.assoc_req.ssid = wdev->conn->params.ssid;
 134                 u.assoc_req.ssid_len = wdev->conn->params.ssid_len;
 135                 u.assoc_req.ie = wdev->conn->params.ie;
 136                 u.assoc_req.ie_len = wdev->conn->params.ie_len;
 137                 u.assoc_req.use_mfp = false;
 138                 memcpy(&u.assoc_req.crypto, &wdev->conn->params.crypto,
 139                         sizeof(u.assoc_req.crypto));
 140                 wdev->conn->state = CFG80211_CONN_ASSOCIATING;
 141                 BUG_ON(!drv->ops->assoc);
 142                 return drv->ops->assoc(wdev->wiphy, wdev->netdev,
 143                                         &u.assoc_req);
 144         default:
 145                 return 0;
 146         }
 147 }
 148
 149 void cfg80211_conn_work(struct work_struct *work)
 150 {
 151         struct cfg80211_registered_device *drv =
 152                 container_of(work, struct cfg80211_registered_device, conn_work);
 153         struct wireless_dev *wdev;
 154
 155         rtnl_lock();
 156         mutex_lock(&drv->devlist_mtx);
 157
 158         list_for_each_entry(wdev, &drv->netdev_list, list) {
 159                 if (!netif_running(wdev->netdev))
 160                         continue;
 161                 if (wdev->sme_state != CFG80211_SME_CONNECTING)
 162                         continue;
 163                 if (cfg80211_conn_do_work(wdev))
 164                         cfg80211_connect_result(wdev->netdev,
 165                                                 wdev->conn->params.bssid,
 166                                                 NULL, 0, NULL, 0,
 167                                                 WLAN_STATUS_UNSPECIFIED_FAILURE,
 168                                                 GFP_ATOMIC);
 169         }
 170
 171         mutex_unlock(&drv->devlist_mtx);
 172         rtnl_unlock();
 173 }
 174
 175 static bool cfg80211_get_conn_bss(struct wireless_dev *wdev)
 176 {
 177         struct cfg80211_registered_device *drv = wiphy_to_dev(wdev->wiphy);
 178         struct cfg80211_bss *bss;
 179         u16 capa = WLAN_CAPABILITY_ESS;
 180
 181         if (wdev->conn->params.privacy)
 182                 capa |= WLAN_CAPABILITY_PRIVACY;
 183
 184         bss = cfg80211_get_bss(wdev->wiphy, NULL, wdev->conn->params.bssid,
 185                                wdev->conn->params.ssid,
 186                                wdev->conn->params.ssid_len,
 187                                WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_PRIVACY,
 188                                capa);
 189
 190         if (!bss)
 191                 return false;
 192
 193         memcpy(wdev->conn->bssid, bss->bssid, ETH_ALEN);
 194         wdev->conn->params.bssid = wdev->conn->bssid;
 195         wdev->conn->params.channel = bss->channel;
 196         wdev->conn->state = CFG80211_CONN_AUTHENTICATE_NEXT;
 197         schedule_work(&drv->conn_work);
 198
 199         cfg80211_put_bss(bss);
 200         return true;
 201 }
 202
 203 void cfg80211_sme_scan_done(struct net_device *dev)
 204 {
 205         struct wireless_dev *wdev = dev->ieee80211_ptr;
 206         struct cfg80211_registered_device *drv = wiphy_to_dev(wdev->wiphy);
 207
 208         if (wdev->sme_state != CFG80211_SME_CONNECTING)
 209                 return;
 210
 211         if (WARN_ON(!wdev->conn))
 212                 return;
 213
 214         if (wdev->conn->state != CFG80211_CONN_SCANNING &&
 215             wdev->conn->state != CFG80211_CONN_SCAN_AGAIN)
 216                 return;
 217
 218         if (!cfg80211_get_conn_bss(wdev)) {
 219                 /* not found */
 220                 if (wdev->conn->state == CFG80211_CONN_SCAN_AGAIN)
 221                         schedule_work(&drv->conn_work);
 222                 else
 223                         cfg80211_connect_result(dev, wdev->conn->params.bssid,
 224                                                 NULL, 0, NULL, 0,
 225                                                 WLAN_STATUS_UNSPECIFIED_FAILURE,
 226                                                 GFP_ATOMIC);
 227                 return;
 228         }
 229 }
 230
 231 void cfg80211_sme_rx_auth(struct net_device *dev, const u8 *buf, size_t len)
 232 {
 233         struct wireless_dev *wdev = dev->ieee80211_ptr;
 234         struct wiphy *wiphy = wdev->wiphy;
 235         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 236         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)buf;
 237         u16 status_code = le16_to_cpu(mgmt->u.auth.status_code);
 238
 239         /* should only RX auth frames when connecting */
 240         if (wdev->sme_state != CFG80211_SME_CONNECTING)
 241                 return;
 242
 243         if (WARN_ON(!wdev->conn))
 244                 return;
 245
 246         if (status_code == WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG &&
 247             wdev->conn->auto_auth &&
 248             wdev->conn->params.auth_type != NL80211_AUTHTYPE_NETWORK_EAP) {
 249                 /* select automatically between only open, shared, leap */
 250                 switch (wdev->conn->params.auth_type) {
 251                 case NL80211_AUTHTYPE_OPEN_SYSTEM:
 252                         wdev->conn->params.auth_type =
 253                                 NL80211_AUTHTYPE_SHARED_KEY;
 254                         break;
 255                 case NL80211_AUTHTYPE_SHARED_KEY:
 256                         wdev->conn->params.auth_type =
 257                                 NL80211_AUTHTYPE_NETWORK_EAP;
 258                         break;
 259                 default:
 260                         /* huh? */
 261                         wdev->conn->params.auth_type =
 262                                 NL80211_AUTHTYPE_OPEN_SYSTEM;
 263                         break;
 264                 }
 265                 wdev->conn->state = CFG80211_CONN_AUTHENTICATE_NEXT;
 266                 schedule_work(&rdev->conn_work);
 267         } else if (status_code != WLAN_STATUS_SUCCESS)
 268                 wdev->sme_state = CFG80211_SME_IDLE;
 269         else if (wdev->sme_state == CFG80211_SME_CONNECTING &&
 270                  wdev->conn->state == CFG80211_CONN_AUTHENTICATING) {
 271                 wdev->conn->state = CFG80211_CONN_ASSOCIATE_NEXT;
 272                 schedule_work(&rdev->conn_work);
 273         }
 274 }
 275
 276 static void __cfg80211_connect_result(struct net_device *dev, const u8 *bssid,
 277                                       const u8 *req_ie, size_t req_ie_len,
 278                                       const u8 *resp_ie, size_t resp_ie_len,
 279                                       u16 status, bool wextev, gfp_t gfp)
 280 {
 281         struct wireless_dev *wdev = dev->ieee80211_ptr;
 282         struct cfg80211_bss *bss;
 283 #ifdef CONFIG_WIRELESS_EXT
 284         union iwreq_data wrqu;
 285 #endif
 286
 287         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
 288                 return;
 289
 290         if (wdev->sme_state == CFG80211_SME_CONNECTED)
 291                 nl80211_send_roamed(wiphy_to_dev(wdev->wiphy), dev,
 292                                     bssid, req_ie, req_ie_len,
 293                                     resp_ie, resp_ie_len, gfp);
 294         else
 295                 nl80211_send_connect_result(wiphy_to_dev(wdev->wiphy), dev,
 296                                             bssid, req_ie, req_ie_len,
 297                                             resp_ie, resp_ie_len,
 298                                             status, gfp);
 299
 300 #ifdef CONFIG_WIRELESS_EXT
 301         if (wextev) {
 302                 if (req_ie && status == WLAN_STATUS_SUCCESS) {
 303                         memset(&wrqu, 0, sizeof(wrqu));
 304                         wrqu.data.length = req_ie_len;
 305                         wireless_send_event(dev, IWEVASSOCRESPIE, &wrqu, req_ie);
 306                 }
 307
 308                 if (resp_ie && status == WLAN_STATUS_SUCCESS) {
 309                         memset(&wrqu, 0, sizeof(wrqu));
 310                         wrqu.data.length = resp_ie_len;
 311                         wireless_send_event(dev, IWEVASSOCRESPIE, &wrqu, resp_ie);
 312                 }
 313
 314                 memset(&wrqu, 0, sizeof(wrqu));
 315                 wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 316                 if (bssid && status == WLAN_STATUS_SUCCESS)
 317                         memcpy(wrqu.ap_addr.sa_data, bssid, ETH_ALEN);
 318                 wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL);
 319         }
 320 #endif
 321
 322         if (status == WLAN_STATUS_SUCCESS &&
 323             wdev->sme_state == CFG80211_SME_IDLE) {
 324                 wdev->sme_state = CFG80211_SME_CONNECTED;
 325                 return;
 326         }
 327
 328         if (wdev->sme_state != CFG80211_SME_CONNECTING)
 329                 return;
 330
 331         if (wdev->current_bss) {
 332                 cfg80211_unhold_bss(wdev->current_bss);
 333                 cfg80211_put_bss(wdev->current_bss);
 334                 wdev->current_bss = NULL;
 335         }
 336
 337         if (status == WLAN_STATUS_SUCCESS) {
 338                 bss = cfg80211_get_bss(wdev->wiphy, NULL, bssid,
 339                                        wdev->ssid, wdev->ssid_len,
 340                                        WLAN_CAPABILITY_ESS,
 341                                        WLAN_CAPABILITY_ESS);
 342
 343                 if (WARN_ON(!bss))
 344                         return;
 345
 346                 cfg80211_hold_bss(bss);
 347                 wdev->current_bss = bss;
 348
 349                 wdev->sme_state = CFG80211_SME_CONNECTED;
 350         } else {
 351                 wdev->sme_state = CFG80211_SME_IDLE;
 352         }
 353
 354         if (wdev->conn)
 355                 wdev->conn->state = CFG80211_CONN_IDLE;
 356 }
 357
 358 void cfg80211_connect_result(struct net_device *dev, const u8 *bssid,
 359                              const u8 *req_ie, size_t req_ie_len,
 360                              const u8 *resp_ie, size_t resp_ie_len,
 361                              u16 status, gfp_t gfp)
 362 {
 363         bool wextev = status == WLAN_STATUS_SUCCESS;
 364         __cfg80211_connect_result(dev, bssid, req_ie, req_ie_len, resp_ie, resp_ie_len, status, wextev, gfp);
 365 }
 366 EXPORT_SYMBOL(cfg80211_connect_result);
 367
 368 void cfg80211_roamed(struct net_device *dev, const u8 *bssid,
 369                      const u8 *req_ie, size_t req_ie_len,
 370                      const u8 *resp_ie, size_t resp_ie_len, gfp_t gfp)
 371 {
 372         struct wireless_dev *wdev = dev->ieee80211_ptr;
 373         struct cfg80211_bss *bss;
 374 #ifdef CONFIG_WIRELESS_EXT
 375         union iwreq_data wrqu;
 376 #endif
 377
 378         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
 379                 return;
 380
 381         if (WARN_ON(wdev->sme_state != CFG80211_SME_CONNECTED))
 382                 return;
 383
 384         /* internal error -- how did we get to CONNECTED w/o BSS? */
 385         if (WARN_ON(!wdev->current_bss)) {
 386                 return;
 387         }
 388
 389         cfg80211_unhold_bss(wdev->current_bss);
 390         cfg80211_put_bss(wdev->current_bss);
 391         wdev->current_bss = NULL;
 392
 393         bss = cfg80211_get_bss(wdev->wiphy, NULL, bssid,
 394                                wdev->ssid, wdev->ssid_len,
 395                                WLAN_CAPABILITY_ESS, WLAN_CAPABILITY_ESS);
 396
 397         if (WARN_ON(!bss))
 398                 return;
 399
 400         cfg80211_hold_bss(bss);
 401         wdev->current_bss = bss;
 402
 403         nl80211_send_roamed(wiphy_to_dev(wdev->wiphy), dev, bssid,
 404                             req_ie, req_ie_len, resp_ie, resp_ie_len, gfp);
 405
 406 #ifdef CONFIG_WIRELESS_EXT
 407         if (req_ie) {
 408                 memset(&wrqu, 0, sizeof(wrqu));
 409                 wrqu.data.length = req_ie_len;
 410                 wireless_send_event(dev, IWEVASSOCRESPIE, &wrqu, req_ie);
 411         }
 412
 413         if (resp_ie) {
 414                 memset(&wrqu, 0, sizeof(wrqu));
 415                 wrqu.data.length = resp_ie_len;
 416                 wireless_send_event(dev, IWEVASSOCRESPIE, &wrqu, resp_ie);
 417         }
 418
 419         memset(&wrqu, 0, sizeof(wrqu));
 420         wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 421         memcpy(wrqu.ap_addr.sa_data, bssid, ETH_ALEN);
 422         wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL);
 423 #endif
 424 }
 425 EXPORT_SYMBOL(cfg80211_roamed);
 426
 427 void __cfg80211_disconnected(struct net_device *dev, gfp_t gfp, u8 *ie,
 428                              size_t ie_len, u16 reason, bool from_ap)
 429 {
 430         struct wireless_dev *wdev = dev->ieee80211_ptr;
 431 #ifdef CONFIG_WIRELESS_EXT
 432         union iwreq_data wrqu;
 433 #endif
 434
 435         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
 436                 return;
 437
 438         if (WARN_ON(wdev->sme_state != CFG80211_SME_CONNECTED))
 439                 return;
 440
 441         if (wdev->current_bss) {
 442                 cfg80211_unhold_bss(wdev->current_bss);
 443                 cfg80211_put_bss(wdev->current_bss);
 444         }
 445
 446         wdev->current_bss = NULL;
 447         wdev->sme_state = CFG80211_SME_IDLE;
 448
 449         if (wdev->conn) {
 450                 kfree(wdev->conn->ie);
 451                 wdev->conn->ie = NULL;
 452         }
 453
 454         nl80211_send_disconnected(wiphy_to_dev(wdev->wiphy), dev,
 455                                   reason, ie, ie_len, from_ap, gfp);
 456
 457 #ifdef CONFIG_WIRELESS_EXT
 458         memset(&wrqu, 0, sizeof(wrqu));
 459         wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 460         wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL);
 461 #endif
 462 }
 463
 464 void cfg80211_disconnected(struct net_device *dev, u16 reason,
 465                            u8 *ie, size_t ie_len, gfp_t gfp)
 466 {
 467         __cfg80211_disconnected(dev, gfp, ie, ie_len, reason, true);
 468 }
 469 EXPORT_SYMBOL(cfg80211_disconnected);
 470
 471 int cfg80211_connect(struct cfg80211_registered_device *rdev,
 472                      struct net_device *dev,
 473                      struct cfg80211_connect_params *connect)
 474 {
 475         int err;
 476         struct wireless_dev *wdev = dev->ieee80211_ptr;
 477
 478         if (wdev->sme_state != CFG80211_SME_IDLE)
 479                 return -EALREADY;
 480
 481         if (!rdev->ops->connect) {
 482                 if (!rdev->ops->auth || !rdev->ops->assoc)
 483                         return -EOPNOTSUPP;
 484
 485                 if (!wdev->conn) {
 486                         wdev->conn = kzalloc(sizeof(*wdev->conn), GFP_KERNEL);
 487                         if (!wdev->conn)
 488                                 return -ENOMEM;
 489                 } else
 490                         memset(wdev->conn, 0, sizeof(*wdev->conn));
 491
 492                 /*
 493                  * Copy all parameters, and treat explicitly IEs, BSSID, SSID.
 494                  */
 495                 memcpy(&wdev->conn->params, connect, sizeof(*connect));
 496                 if (connect->bssid) {
 497                         wdev->conn->params.bssid = wdev->conn->bssid;
 498                         memcpy(wdev->conn->bssid, connect->bssid, ETH_ALEN);
 499                 }
 500
 501                 if (connect->ie) {
 502                         wdev->conn->ie = kmemdup(connect->ie, connect->ie_len,
 503                                                 GFP_KERNEL);
 504                         wdev->conn->params.ie = wdev->conn->ie;
 505                         if (!wdev->conn->ie)
 506                                 return -ENOMEM;
 507                 }
 508
 509                 if (connect->auth_type == NL80211_AUTHTYPE_AUTOMATIC) {
 510                         wdev->conn->auto_auth = true;
 511                         /* start with open system ... should mostly work */
 512                         wdev->conn->params.auth_type =
 513                                 NL80211_AUTHTYPE_OPEN_SYSTEM;
 514                 } else {
 515                         wdev->conn->auto_auth = false;
 516                 }
 517
 518                 memcpy(wdev->ssid, connect->ssid, connect->ssid_len);
 519                 wdev->ssid_len = connect->ssid_len;
 520                 wdev->conn->params.ssid = wdev->ssid;
 521                 wdev->conn->params.ssid_len = connect->ssid_len;
 522
 523                 /* don't care about result -- but fill bssid & channel */
 524                 if (!wdev->conn->params.bssid || !wdev->conn->params.channel)
 525                         cfg80211_get_conn_bss(wdev);
 526
 527                 wdev->sme_state = CFG80211_SME_CONNECTING;
 528
 529                 /* we're good if we have both BSSID and channel */
 530                 if (wdev->conn->params.bssid && wdev->conn->params.channel) {
 531                         wdev->conn->state = CFG80211_CONN_AUTHENTICATE_NEXT;
 532                         err = cfg80211_conn_do_work(wdev);
 533                 } else {
 534                         /* otherwise we'll need to scan for the AP first */
 535                         err = cfg80211_conn_scan(wdev);
 536                         /*
 537                          * If we can't scan right now, then we need to scan again
 538                          * after the current scan finished, since the parameters
 539                          * changed (unless we find a good AP anyway).
 540                          */
 541                         if (err == -EBUSY) {
 542                                 err = 0;
 543                                 wdev->conn->state = CFG80211_CONN_SCAN_AGAIN;
 544                         }
 545                 }
 546                 if (err)
 547                         wdev->sme_state = CFG80211_SME_IDLE;
 548
 549                 return err;
 550         } else {
 551                 wdev->sme_state = CFG80211_SME_CONNECTING;
 552                 err = rdev->ops->connect(&rdev->wiphy, dev, connect);
 553                 if (err) {
 554                         wdev->sme_state = CFG80211_SME_IDLE;
 555                         return err;
 556                 }
 557
 558                 memcpy(wdev->ssid, connect->ssid, connect->ssid_len);
 559                 wdev->ssid_len = connect->ssid_len;
 560
 561                 return 0;
 562         }
 563 }
 564
 565 int cfg80211_disconnect(struct cfg80211_registered_device *rdev,
 566                         struct net_device *dev, u16 reason, bool wextev)
 567 {
 568         struct wireless_dev *wdev = dev->ieee80211_ptr;
 569         int err;
 570
 571         if (wdev->sme_state == CFG80211_SME_IDLE)
 572                 return -EINVAL;
 573
 574         if (!rdev->ops->disconnect) {
 575                 struct cfg80211_deauth_request deauth;
 576                 u8 bssid[ETH_ALEN];
 577
 578                 /* internal bug. */
 579                 if (WARN_ON(!wdev->conn))
 580                         return -EINVAL;
 581
 582                 if (wdev->sme_state == CFG80211_SME_CONNECTING &&
 583                     (wdev->conn->state == CFG80211_CONN_SCANNING ||
 584                      wdev->conn->state == CFG80211_CONN_SCAN_AGAIN)) {
 585                         wdev->sme_state = CFG80211_SME_IDLE;
 586                         return 0;
 587                 }
 588
 589                 if (!rdev->ops->deauth)
 590                         return -EOPNOTSUPP;
 591
 592                 memset(&deauth, 0, sizeof(deauth));
 593
 594                 /* wdev->conn->params.bssid must be set if > SCANNING */
 595                 memcpy(bssid, wdev->conn->params.bssid, ETH_ALEN);
 596                 deauth.peer_addr = bssid;
 597                 deauth.reason_code = reason;
 598
 599                 err = rdev->ops->deauth(&rdev->wiphy, dev, &deauth);
 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 }