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 <linux/wireless.h>
  12 #include <net/iw_handler.h>
  13 #include <net/cfg80211.h>
  14 #include <net/rtnetlink.h>
  15 #include "nl80211.h"
  16 #include "reg.h"
  17
  18 struct cfg80211_conn {
  19         struct cfg80211_connect_params params;
  20         /* these are sub-states of the _CONNECTING sme_state */
  21         enum {
  22                 CFG80211_CONN_IDLE,
  23                 CFG80211_CONN_SCANNING,
  24                 CFG80211_CONN_SCAN_AGAIN,
  25                 CFG80211_CONN_AUTHENTICATE_NEXT,
  26                 CFG80211_CONN_AUTHENTICATING,
  27                 CFG80211_CONN_ASSOCIATE_NEXT,
  28                 CFG80211_CONN_ASSOCIATING,
  29         } state;
  30         u8 bssid[ETH_ALEN];
  31         u8 *ie;
  32         size_t ie_len;
  33         bool auto_auth;
  34 };
  35
  36
  37 static int cfg80211_conn_scan(struct wireless_dev *wdev)
  38 {
  39         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
  40         struct cfg80211_scan_request *request;
  41         int n_channels, err;
  42
  43         ASSERT_RTNL();
  44         ASSERT_RDEV_LOCK(rdev);
  45         ASSERT_WDEV_LOCK(wdev);
  46
  47         if (rdev->scan_req)
  48                 return -EBUSY;
  49
  50         if (wdev->conn->params.channel) {
  51                 n_channels = 1;
  52         } else {
  53                 enum ieee80211_band band;
  54                 n_channels = 0;
  55
  56                 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
  57                         if (!wdev->wiphy->bands[band])
  58                                 continue;
  59                         n_channels += wdev->wiphy->bands[band]->n_channels;
  60                 }
  61         }
  62         request = kzalloc(sizeof(*request) + sizeof(request->ssids[0]) +
  63                           sizeof(request->channels[0]) * n_channels,
  64                           GFP_KERNEL);
  65         if (!request)
  66                 return -ENOMEM;
  67
  68         request->channels = (void *)((char *)request + sizeof(*request));
  69         if (wdev->conn->params.channel)
  70                 request->channels[0] = wdev->conn->params.channel;
  71         else {
  72                 int i = 0, j;
  73                 enum ieee80211_band band;
  74
  75                 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
  76                         if (!wdev->wiphy->bands[band])
  77                                 continue;
  78                         for (j = 0; j < wdev->wiphy->bands[band]->n_channels;
  79                              i++, j++)
  80                                 request->channels[i] =
  81                                         &wdev->wiphy->bands[band]->channels[j];
  82                 }
  83         }
  84         request->n_channels = n_channels;
  85         request->ssids = (void *)(request->channels + n_channels);
  86         request->n_ssids = 1;
  87
  88         memcpy(request->ssids[0].ssid, wdev->conn->params.ssid,
  89                 wdev->conn->params.ssid_len);
  90         request->ssids[0].ssid_len = wdev->conn->params.ssid_len;
  91
  92         request->dev = wdev->netdev;
  93         request->wiphy = &rdev->wiphy;
  94
  95         rdev->scan_req = request;
  96
  97         err = rdev->ops->scan(wdev->wiphy, wdev->netdev, request);
  98         if (!err) {
  99                 wdev->conn->state = CFG80211_CONN_SCANNING;
 100                 nl80211_send_scan_start(rdev, wdev->netdev);
 101                 dev_hold(wdev->netdev);
 102         } else {
 103                 rdev->scan_req = NULL;
 104                 kfree(request);
 105         }
 106         return err;
 107 }
 108
 109 static int cfg80211_conn_do_work(struct wireless_dev *wdev)
 110 {
 111         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 112         struct cfg80211_connect_params *params;
 113         int err;
 114
 115         ASSERT_WDEV_LOCK(wdev);
 116
 117         if (!wdev->conn)
 118                 return 0;
 119
 120         params = &wdev->conn->params;
 121
 122         switch (wdev->conn->state) {
 123         case CFG80211_CONN_SCAN_AGAIN:
 124                 return cfg80211_conn_scan(wdev);
 125         case CFG80211_CONN_AUTHENTICATE_NEXT:
 126                 BUG_ON(!rdev->ops->auth);
 127                 wdev->conn->state = CFG80211_CONN_AUTHENTICATING;
 128                 return __cfg80211_mlme_auth(rdev, wdev->netdev,
 129                                             params->channel, params->auth_type,
 130                                             params->bssid,
 131                                             params->ssid, params->ssid_len,
 132                                             NULL, 0,
 133                                             params->key, params->key_len,
 134                                             params->key_idx);
 135         case CFG80211_CONN_ASSOCIATE_NEXT:
 136                 BUG_ON(!rdev->ops->assoc);
 137                 wdev->conn->state = CFG80211_CONN_ASSOCIATING;
 138                 /*
 139                  * We could, later, implement roaming here and then actually
 140                  * set prev_bssid to non-NULL. But then we need to be aware
 141                  * that some APs don't like that -- so we'd need to retry
 142                  * the association.
 143                  */
 144                 err = __cfg80211_mlme_assoc(rdev, wdev->netdev,
 145                                             params->channel, params->bssid,
 146                                             NULL,
 147                                             params->ssid, params->ssid_len,
 148                                             params->ie, params->ie_len,
 149                                             false, &params->crypto);
 150                 if (err)
 151                         __cfg80211_mlme_deauth(rdev, wdev->netdev, params->bssid,
 152                                                NULL, 0,
 153                                                WLAN_REASON_DEAUTH_LEAVING);
 154                 return err;
 155         default:
 156                 return 0;
 157         }
 158 }
 159
 160 void cfg80211_conn_work(struct work_struct *work)
 161 {
 162         struct cfg80211_registered_device *rdev =
 163                 container_of(work, struct cfg80211_registered_device, conn_work);
 164         struct wireless_dev *wdev;
 165
 166         rtnl_lock();
 167         cfg80211_lock_rdev(rdev);
 168         mutex_lock(&rdev->devlist_mtx);
 169
 170         list_for_each_entry(wdev, &rdev->netdev_list, list) {
 171                 wdev_lock(wdev);
 172                 if (!netif_running(wdev->netdev)) {
 173                         wdev_unlock(wdev);
 174                         continue;
 175                 }
 176                 if (wdev->sme_state != CFG80211_SME_CONNECTING) {
 177                         wdev_unlock(wdev);
 178                         continue;
 179                 }
 180                 if (cfg80211_conn_do_work(wdev))
 181                         __cfg80211_connect_result(
 182                                         wdev->netdev,
 183                                         wdev->conn->params.bssid,
 184                                         NULL, 0, NULL, 0,
 185                                         WLAN_STATUS_UNSPECIFIED_FAILURE,
 186                                         false, NULL);
 187                 wdev_unlock(wdev);
 188         }
 189
 190         mutex_unlock(&rdev->devlist_mtx);
 191         cfg80211_unlock_rdev(rdev);
 192         rtnl_unlock();
 193 }
 194
 195 static bool cfg80211_get_conn_bss(struct wireless_dev *wdev)
 196 {
 197         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 198         struct cfg80211_bss *bss;
 199         u16 capa = WLAN_CAPABILITY_ESS;
 200
 201         ASSERT_WDEV_LOCK(wdev);
 202
 203         if (wdev->conn->params.privacy)
 204                 capa |= WLAN_CAPABILITY_PRIVACY;
 205
 206         bss = cfg80211_get_bss(wdev->wiphy, NULL, wdev->conn->params.bssid,
 207                                wdev->conn->params.ssid,
 208                                wdev->conn->params.ssid_len,
 209                                WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_PRIVACY,
 210                                capa);
 211         if (!bss)
 212                 return false;
 213
 214         memcpy(wdev->conn->bssid, bss->bssid, ETH_ALEN);
 215         wdev->conn->params.bssid = wdev->conn->bssid;
 216         wdev->conn->params.channel = bss->channel;
 217         wdev->conn->state = CFG80211_CONN_AUTHENTICATE_NEXT;
 218         schedule_work(&rdev->conn_work);
 219
 220         cfg80211_put_bss(bss);
 221         return true;
 222 }
 223
 224 static void __cfg80211_sme_scan_done(struct net_device *dev)
 225 {
 226         struct wireless_dev *wdev = dev->ieee80211_ptr;
 227         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 228
 229         ASSERT_WDEV_LOCK(wdev);
 230
 231         if (wdev->sme_state != CFG80211_SME_CONNECTING)
 232                 return;
 233
 234         if (!wdev->conn)
 235                 return;
 236
 237         if (wdev->conn->state != CFG80211_CONN_SCANNING &&
 238             wdev->conn->state != CFG80211_CONN_SCAN_AGAIN)
 239                 return;
 240
 241         if (!cfg80211_get_conn_bss(wdev)) {
 242                 /* not found */
 243                 if (wdev->conn->state == CFG80211_CONN_SCAN_AGAIN)
 244                         schedule_work(&rdev->conn_work);
 245                 else
 246                         __cfg80211_connect_result(
 247                                         wdev->netdev,
 248                                         wdev->conn->params.bssid,
 249                                         NULL, 0, NULL, 0,
 250                                         WLAN_STATUS_UNSPECIFIED_FAILURE,
 251                                         false, NULL);
 252         }
 253 }
 254
 255 void cfg80211_sme_scan_done(struct net_device *dev)
 256 {
 257         struct wireless_dev *wdev = dev->ieee80211_ptr;
 258
 259         wdev_lock(wdev);
 260         __cfg80211_sme_scan_done(dev);
 261         wdev_unlock(wdev);
 262 }
 263
 264 void cfg80211_sme_rx_auth(struct net_device *dev,
 265                           const u8 *buf, size_t len)
 266 {
 267         struct wireless_dev *wdev = dev->ieee80211_ptr;
 268         struct wiphy *wiphy = wdev->wiphy;
 269         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 270         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)buf;
 271         u16 status_code = le16_to_cpu(mgmt->u.auth.status_code);
 272
 273         ASSERT_WDEV_LOCK(wdev);
 274
 275         /* should only RX auth frames when connecting */
 276         if (wdev->sme_state != CFG80211_SME_CONNECTING)
 277                 return;
 278
 279         if (WARN_ON(!wdev->conn))
 280                 return;
 281
 282         if (status_code == WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG &&
 283             wdev->conn->auto_auth &&
 284             wdev->conn->params.auth_type != NL80211_AUTHTYPE_NETWORK_EAP) {
 285                 /* select automatically between only open, shared, leap */
 286                 switch (wdev->conn->params.auth_type) {
 287                 case NL80211_AUTHTYPE_OPEN_SYSTEM:
 288                         if (wdev->connect_keys)
 289                                 wdev->conn->params.auth_type =
 290                                         NL80211_AUTHTYPE_SHARED_KEY;
 291                         else
 292                                 wdev->conn->params.auth_type =
 293                                         NL80211_AUTHTYPE_NETWORK_EAP;
 294                         break;
 295                 case NL80211_AUTHTYPE_SHARED_KEY:
 296                         wdev->conn->params.auth_type =
 297                                 NL80211_AUTHTYPE_NETWORK_EAP;
 298                         break;
 299                 default:
 300                         /* huh? */
 301                         wdev->conn->params.auth_type =
 302                                 NL80211_AUTHTYPE_OPEN_SYSTEM;
 303                         break;
 304                 }
 305                 wdev->conn->state = CFG80211_CONN_AUTHENTICATE_NEXT;
 306                 schedule_work(&rdev->conn_work);
 307         } else if (status_code != WLAN_STATUS_SUCCESS) {
 308                 __cfg80211_connect_result(dev, mgmt->bssid, NULL, 0, NULL, 0,
 309                                           status_code, false, NULL);
 310         } else if (wdev->sme_state == CFG80211_SME_CONNECTING &&
 311                  wdev->conn->state == CFG80211_CONN_AUTHENTICATING) {
 312                 wdev->conn->state = CFG80211_CONN_ASSOCIATE_NEXT;
 313                 schedule_work(&rdev->conn_work);
 314         }
 315 }
 316
 317 void __cfg80211_connect_result(struct net_device *dev, const u8 *bssid,
 318                                const u8 *req_ie, size_t req_ie_len,
 319                                const u8 *resp_ie, size_t resp_ie_len,
 320                                u16 status, bool wextev,
 321                                struct cfg80211_bss *bss)
 322 {
 323         struct wireless_dev *wdev = dev->ieee80211_ptr;
 324         u8 *country_ie;
 325 #ifdef CONFIG_WIRELESS_EXT
 326         union iwreq_data wrqu;
 327 #endif
 328
 329         ASSERT_WDEV_LOCK(wdev);
 330
 331         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
 332                 return;
 333
 334         if (wdev->sme_state == CFG80211_SME_CONNECTED)
 335                 nl80211_send_roamed(wiphy_to_dev(wdev->wiphy), dev,
 336                                     bssid, req_ie, req_ie_len,
 337                                     resp_ie, resp_ie_len, GFP_KERNEL);
 338         else
 339                 nl80211_send_connect_result(wiphy_to_dev(wdev->wiphy), dev,
 340                                             bssid, req_ie, req_ie_len,
 341                                             resp_ie, resp_ie_len,
 342                                             status, GFP_KERNEL);
 343
 344 #ifdef CONFIG_WIRELESS_EXT
 345         if (wextev) {
 346                 if (req_ie && status == WLAN_STATUS_SUCCESS) {
 347                         memset(&wrqu, 0, sizeof(wrqu));
 348                         wrqu.data.length = req_ie_len;
 349                         wireless_send_event(dev, IWEVASSOCREQIE, &wrqu, req_ie);
 350                 }
 351
 352                 if (resp_ie && status == WLAN_STATUS_SUCCESS) {
 353                         memset(&wrqu, 0, sizeof(wrqu));
 354                         wrqu.data.length = resp_ie_len;
 355                         wireless_send_event(dev, IWEVASSOCRESPIE, &wrqu, resp_ie);
 356                 }
 357
 358                 memset(&wrqu, 0, sizeof(wrqu));
 359                 wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 360                 if (bssid && status == WLAN_STATUS_SUCCESS)
 361                         memcpy(wrqu.ap_addr.sa_data, bssid, ETH_ALEN);
 362                 wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL);
 363         }
 364 #endif
 365
 366         if (wdev->current_bss) {
 367                 cfg80211_unhold_bss(wdev->current_bss);
 368                 cfg80211_put_bss(&wdev->current_bss->pub);
 369                 wdev->current_bss = NULL;
 370         }
 371
 372         if (status == WLAN_STATUS_SUCCESS &&
 373             wdev->sme_state == CFG80211_SME_IDLE)
 374                 goto success;
 375
 376         if (wdev->sme_state != CFG80211_SME_CONNECTING)
 377                 return;
 378
 379         if (wdev->conn)
 380                 wdev->conn->state = CFG80211_CONN_IDLE;
 381
 382         if (status != WLAN_STATUS_SUCCESS) {
 383                 wdev->sme_state = CFG80211_SME_IDLE;
 384                 kfree(wdev->conn);
 385                 wdev->conn = NULL;
 386                 kfree(wdev->connect_keys);
 387                 wdev->connect_keys = NULL;
 388                 wdev->ssid_len = 0;
 389                 return;
 390         }
 391
 392  success:
 393         if (!bss)
 394                 bss = cfg80211_get_bss(wdev->wiphy, NULL, bssid,
 395                                        wdev->ssid, wdev->ssid_len,
 396                                        WLAN_CAPABILITY_ESS,
 397                                        WLAN_CAPABILITY_ESS);
 398
 399         if (WARN_ON(!bss))
 400                 return;
 401
 402         cfg80211_hold_bss(bss_from_pub(bss));
 403         wdev->current_bss = bss_from_pub(bss);
 404
 405         wdev->sme_state = CFG80211_SME_CONNECTED;
 406         cfg80211_upload_connect_keys(wdev);
 407
 408         country_ie = (u8 *) ieee80211_bss_get_ie(bss, WLAN_EID_COUNTRY);
 409
 410         if (!country_ie)
 411                 return;
 412
 413         /*
 414          * ieee80211_bss_get_ie() ensures we can access:
 415          * - country_ie + 2, the start of the country ie data, and
 416          * - and country_ie[1] which is the IE length
 417          */
 418         regulatory_hint_11d(wdev->wiphy,
 419                             country_ie + 2,
 420                             country_ie[1]);
 421 }
 422
 423 void cfg80211_connect_result(struct net_device *dev, const u8 *bssid,
 424                              const u8 *req_ie, size_t req_ie_len,
 425                              const u8 *resp_ie, size_t resp_ie_len,
 426                              u16 status, gfp_t gfp)
 427 {
 428         struct wireless_dev *wdev = dev->ieee80211_ptr;
 429         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 430         struct cfg80211_event *ev;
 431         unsigned long flags;
 432
 433         ev = kzalloc(sizeof(*ev) + req_ie_len + resp_ie_len, gfp);
 434         if (!ev)
 435                 return;
 436
 437         ev->type = EVENT_CONNECT_RESULT;
 438         memcpy(ev->cr.bssid, bssid, ETH_ALEN);
 439         ev->cr.req_ie = ((u8 *)ev) + sizeof(*ev);
 440         ev->cr.req_ie_len = req_ie_len;
 441         memcpy((void *)ev->cr.req_ie, req_ie, req_ie_len);
 442         ev->cr.resp_ie = ((u8 *)ev) + sizeof(*ev) + req_ie_len;
 443         ev->cr.resp_ie_len = resp_ie_len;
 444         memcpy((void *)ev->cr.resp_ie, resp_ie, resp_ie_len);
 445         ev->cr.status = status;
 446
 447         spin_lock_irqsave(&wdev->event_lock, flags);
 448         list_add_tail(&ev->list, &wdev->event_list);
 449         spin_unlock_irqrestore(&wdev->event_lock, flags);
 450         schedule_work(&rdev->event_work);
 451 }
 452 EXPORT_SYMBOL(cfg80211_connect_result);
 453
 454 void __cfg80211_roamed(struct wireless_dev *wdev, const u8 *bssid,
 455                        const u8 *req_ie, size_t req_ie_len,
 456                        const u8 *resp_ie, size_t resp_ie_len)
 457 {
 458         struct cfg80211_bss *bss;
 459 #ifdef CONFIG_WIRELESS_EXT
 460         union iwreq_data wrqu;
 461 #endif
 462
 463         ASSERT_WDEV_LOCK(wdev);
 464
 465         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
 466                 return;
 467
 468         if (WARN_ON(wdev->sme_state != CFG80211_SME_CONNECTED))
 469                 return;
 470
 471         /* internal error -- how did we get to CONNECTED w/o BSS? */
 472         if (WARN_ON(!wdev->current_bss)) {
 473                 return;
 474         }
 475
 476         cfg80211_unhold_bss(wdev->current_bss);
 477         cfg80211_put_bss(&wdev->current_bss->pub);
 478         wdev->current_bss = NULL;
 479
 480         bss = cfg80211_get_bss(wdev->wiphy, NULL, bssid,
 481                                wdev->ssid, wdev->ssid_len,
 482                                WLAN_CAPABILITY_ESS, WLAN_CAPABILITY_ESS);
 483
 484         if (WARN_ON(!bss))
 485                 return;
 486
 487         cfg80211_hold_bss(bss_from_pub(bss));
 488         wdev->current_bss = bss_from_pub(bss);
 489
 490         nl80211_send_roamed(wiphy_to_dev(wdev->wiphy), wdev->netdev, bssid,
 491                             req_ie, req_ie_len, resp_ie, resp_ie_len,
 492                             GFP_KERNEL);
 493
 494 #ifdef CONFIG_WIRELESS_EXT
 495         if (req_ie) {
 496                 memset(&wrqu, 0, sizeof(wrqu));
 497                 wrqu.data.length = req_ie_len;
 498                 wireless_send_event(wdev->netdev, IWEVASSOCREQIE,
 499                                     &wrqu, req_ie);
 500         }
 501
 502         if (resp_ie) {
 503                 memset(&wrqu, 0, sizeof(wrqu));
 504                 wrqu.data.length = resp_ie_len;
 505                 wireless_send_event(wdev->netdev, IWEVASSOCRESPIE,
 506                                     &wrqu, resp_ie);
 507         }
 508
 509         memset(&wrqu, 0, sizeof(wrqu));
 510         wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 511         memcpy(wrqu.ap_addr.sa_data, bssid, ETH_ALEN);
 512         wireless_send_event(wdev->netdev, SIOCGIWAP, &wrqu, NULL);
 513 #endif
 514 }
 515
 516 void cfg80211_roamed(struct net_device *dev, const u8 *bssid,
 517                      const u8 *req_ie, size_t req_ie_len,
 518                      const u8 *resp_ie, size_t resp_ie_len, gfp_t gfp)
 519 {
 520         struct wireless_dev *wdev = dev->ieee80211_ptr;
 521         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 522         struct cfg80211_event *ev;
 523         unsigned long flags;
 524
 525         ev = kzalloc(sizeof(*ev) + req_ie_len + resp_ie_len, gfp);
 526         if (!ev)
 527                 return;
 528
 529         ev->type = EVENT_ROAMED;
 530         memcpy(ev->rm.bssid, bssid, ETH_ALEN);
 531         ev->rm.req_ie = ((u8 *)ev) + sizeof(*ev);
 532         ev->rm.req_ie_len = req_ie_len;
 533         memcpy((void *)ev->rm.req_ie, req_ie, req_ie_len);
 534         ev->rm.resp_ie = ((u8 *)ev) + sizeof(*ev) + req_ie_len;
 535         ev->rm.resp_ie_len = resp_ie_len;
 536         memcpy((void *)ev->rm.resp_ie, resp_ie, resp_ie_len);
 537
 538         spin_lock_irqsave(&wdev->event_lock, flags);
 539         list_add_tail(&ev->list, &wdev->event_list);
 540         spin_unlock_irqrestore(&wdev->event_lock, flags);
 541         schedule_work(&rdev->event_work);
 542 }
 543 EXPORT_SYMBOL(cfg80211_roamed);
 544
 545 void __cfg80211_disconnected(struct net_device *dev, const u8 *ie,
 546                              size_t ie_len, u16 reason, bool from_ap)
 547 {
 548         struct wireless_dev *wdev = dev->ieee80211_ptr;
 549         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 550         int i;
 551 #ifdef CONFIG_WIRELESS_EXT
 552         union iwreq_data wrqu;
 553 #endif
 554
 555         ASSERT_WDEV_LOCK(wdev);
 556
 557         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
 558                 return;
 559
 560         if (WARN_ON(wdev->sme_state != CFG80211_SME_CONNECTED))
 561                 return;
 562
 563         if (wdev->current_bss) {
 564                 cfg80211_unhold_bss(wdev->current_bss);
 565                 cfg80211_put_bss(&wdev->current_bss->pub);
 566         }
 567
 568         wdev->current_bss = NULL;
 569         wdev->sme_state = CFG80211_SME_IDLE;
 570         wdev->ssid_len = 0;
 571
 572         if (wdev->conn) {
 573                 kfree(wdev->conn->ie);
 574                 wdev->conn->ie = NULL;
 575                 kfree(wdev->conn);
 576                 wdev->conn = NULL;
 577         }
 578
 579         nl80211_send_disconnected(rdev, dev, reason, ie, ie_len, from_ap);
 580
 581         /*
 582          * Delete all the keys ... pairwise keys can't really
 583          * exist any more anyway, but default keys might.
 584          */
 585         if (rdev->ops->del_key)
 586                 for (i = 0; i < 6; i++)
 587                         rdev->ops->del_key(wdev->wiphy, dev, i, NULL);
 588
 589 #ifdef CONFIG_WIRELESS_EXT
 590         memset(&wrqu, 0, sizeof(wrqu));
 591         wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 592         wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL);
 593 #endif
 594 }
 595
 596 void cfg80211_disconnected(struct net_device *dev, u16 reason,
 597                            u8 *ie, size_t ie_len, gfp_t gfp)
 598 {
 599         struct wireless_dev *wdev = dev->ieee80211_ptr;
 600         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 601         struct cfg80211_event *ev;
 602         unsigned long flags;
 603
 604         ev = kzalloc(sizeof(*ev) + ie_len, gfp);
 605         if (!ev)
 606                 return;
 607
 608         ev->type = EVENT_DISCONNECTED;
 609         ev->dc.ie = ((u8 *)ev) + sizeof(*ev);
 610         ev->dc.ie_len = ie_len;
 611         memcpy((void *)ev->dc.ie, ie, ie_len);
 612         ev->dc.reason = reason;
 613
 614         spin_lock_irqsave(&wdev->event_lock, flags);
 615         list_add_tail(&ev->list, &wdev->event_list);
 616         spin_unlock_irqrestore(&wdev->event_lock, flags);
 617         schedule_work(&rdev->event_work);
 618 }
 619 EXPORT_SYMBOL(cfg80211_disconnected);
 620
 621 int __cfg80211_connect(struct cfg80211_registered_device *rdev,
 622                        struct net_device *dev,
 623                        struct cfg80211_connect_params *connect,
 624                        struct cfg80211_cached_keys *connkeys)
 625 {
 626         struct wireless_dev *wdev = dev->ieee80211_ptr;
 627         int err;
 628
 629         ASSERT_WDEV_LOCK(wdev);
 630
 631         if (wdev->sme_state != CFG80211_SME_IDLE)
 632                 return -EALREADY;
 633
 634         if (WARN_ON(wdev->connect_keys)) {
 635                 kfree(wdev->connect_keys);
 636                 wdev->connect_keys = NULL;
 637         }
 638
 639         if (connkeys && connkeys->def >= 0) {
 640                 int idx;
 641
 642                 idx = connkeys->def;
 643                 /* If given a WEP key we may need it for shared key auth */
 644                 if (connkeys->params[idx].cipher == WLAN_CIPHER_SUITE_WEP40 ||
 645                     connkeys->params[idx].cipher == WLAN_CIPHER_SUITE_WEP104) {
 646                         connect->key_idx = idx;
 647                         connect->key = connkeys->params[idx].key;
 648                         connect->key_len = connkeys->params[idx].key_len;
 649                 }
 650         }
 651
 652         if (!rdev->ops->connect) {
 653                 if (!rdev->ops->auth || !rdev->ops->assoc)
 654                         return -EOPNOTSUPP;
 655
 656                 if (WARN_ON(wdev->conn))
 657                         return -EINPROGRESS;
 658
 659                 wdev->conn = kzalloc(sizeof(*wdev->conn), GFP_KERNEL);
 660                 if (!wdev->conn)
 661                         return -ENOMEM;
 662
 663                 /*
 664                  * Copy all parameters, and treat explicitly IEs, BSSID, SSID.
 665                  */
 666                 memcpy(&wdev->conn->params, connect, sizeof(*connect));
 667                 if (connect->bssid) {
 668                         wdev->conn->params.bssid = wdev->conn->bssid;
 669                         memcpy(wdev->conn->bssid, connect->bssid, ETH_ALEN);
 670                 }
 671
 672                 if (connect->ie) {
 673                         wdev->conn->ie = kmemdup(connect->ie, connect->ie_len,
 674                                                 GFP_KERNEL);
 675                         wdev->conn->params.ie = wdev->conn->ie;
 676                         if (!wdev->conn->ie) {
 677                                 kfree(wdev->conn);
 678                                 wdev->conn = NULL;
 679                                 return -ENOMEM;
 680                         }
 681                 }
 682
 683                 if (connect->auth_type == NL80211_AUTHTYPE_AUTOMATIC) {
 684                         wdev->conn->auto_auth = true;
 685                         /* start with open system ... should mostly work */
 686                         wdev->conn->params.auth_type =
 687                                 NL80211_AUTHTYPE_OPEN_SYSTEM;
 688                 } else {
 689                         wdev->conn->auto_auth = false;
 690                 }
 691
 692                 memcpy(wdev->ssid, connect->ssid, connect->ssid_len);
 693                 wdev->ssid_len = connect->ssid_len;
 694                 wdev->conn->params.ssid = wdev->ssid;
 695                 wdev->conn->params.ssid_len = connect->ssid_len;
 696
 697                 /* don't care about result -- but fill bssid & channel */
 698                 if (!wdev->conn->params.bssid || !wdev->conn->params.channel)
 699                         cfg80211_get_conn_bss(wdev);
 700
 701                 wdev->sme_state = CFG80211_SME_CONNECTING;
 702                 wdev->connect_keys = connkeys;
 703
 704                 /* we're good if we have both BSSID and channel */
 705                 if (wdev->conn->params.bssid && wdev->conn->params.channel) {
 706                         wdev->conn->state = CFG80211_CONN_AUTHENTICATE_NEXT;
 707                         err = cfg80211_conn_do_work(wdev);
 708                 } else {
 709                         /* otherwise we'll need to scan for the AP first */
 710                         err = cfg80211_conn_scan(wdev);
 711                         /*
 712                          * If we can't scan right now, then we need to scan again
 713                          * after the current scan finished, since the parameters
 714                          * changed (unless we find a good AP anyway).
 715                          */
 716                         if (err == -EBUSY) {
 717                                 err = 0;
 718                                 wdev->conn->state = CFG80211_CONN_SCAN_AGAIN;
 719                         }
 720                 }
 721                 if (err) {
 722                         kfree(wdev->conn);
 723                         wdev->conn = NULL;
 724                         wdev->sme_state = CFG80211_SME_IDLE;
 725                         wdev->connect_keys = NULL;
 726                         wdev->ssid_len = 0;
 727                 }
 728
 729                 return err;
 730         } else {
 731                 wdev->sme_state = CFG80211_SME_CONNECTING;
 732                 wdev->connect_keys = connkeys;
 733                 err = rdev->ops->connect(&rdev->wiphy, dev, connect);
 734                 if (err) {
 735                         wdev->connect_keys = NULL;
 736                         wdev->sme_state = CFG80211_SME_IDLE;
 737                         return err;
 738                 }
 739
 740                 memcpy(wdev->ssid, connect->ssid, connect->ssid_len);
 741                 wdev->ssid_len = connect->ssid_len;
 742
 743                 return 0;
 744         }
 745 }
 746
 747 int cfg80211_connect(struct cfg80211_registered_device *rdev,
 748                      struct net_device *dev,
 749                      struct cfg80211_connect_params *connect,
 750                      struct cfg80211_cached_keys *connkeys)
 751 {
 752         int err;
 753
 754         wdev_lock(dev->ieee80211_ptr);
 755         err = __cfg80211_connect(rdev, dev, connect, connkeys);
 756         wdev_unlock(dev->ieee80211_ptr);
 757
 758         return err;
 759 }
 760
 761 int __cfg80211_disconnect(struct cfg80211_registered_device *rdev,
 762                           struct net_device *dev, u16 reason, bool wextev)
 763 {
 764         struct wireless_dev *wdev = dev->ieee80211_ptr;
 765         int err;
 766
 767         ASSERT_WDEV_LOCK(wdev);
 768
 769         if (wdev->sme_state == CFG80211_SME_IDLE)
 770                 return -EINVAL;
 771
 772         kfree(wdev->connect_keys);
 773         wdev->connect_keys = NULL;
 774
 775         if (!rdev->ops->disconnect) {
 776                 if (!rdev->ops->deauth)
 777                         return -EOPNOTSUPP;
 778
 779                 /* was it connected by userspace SME? */
 780                 if (!wdev->conn) {
 781                         cfg80211_mlme_down(rdev, dev);
 782                         return 0;
 783                 }
 784
 785                 if (wdev->sme_state == CFG80211_SME_CONNECTING &&
 786                     (wdev->conn->state == CFG80211_CONN_SCANNING ||
 787                      wdev->conn->state == CFG80211_CONN_SCAN_AGAIN)) {
 788                         wdev->sme_state = CFG80211_SME_IDLE;
 789                         kfree(wdev->conn);
 790                         wdev->conn = NULL;
 791                         wdev->ssid_len = 0;
 792                         return 0;
 793                 }
 794
 795                 /* wdev->conn->params.bssid must be set if > SCANNING */
 796                 err = __cfg80211_mlme_deauth(rdev, dev,
 797                                              wdev->conn->params.bssid,
 798                                              NULL, 0, reason);
 799                 if (err)
 800                         return err;
 801         } else {
 802                 err = rdev->ops->disconnect(&rdev->wiphy, dev, reason);
 803                 if (err)
 804                         return err;
 805         }
 806
 807         if (wdev->sme_state == CFG80211_SME_CONNECTED)
 808                 __cfg80211_disconnected(dev, NULL, 0, 0, false);
 809         else if (wdev->sme_state == CFG80211_SME_CONNECTING)
 810                 __cfg80211_connect_result(dev, NULL, NULL, 0, NULL, 0,
 811                                           WLAN_STATUS_UNSPECIFIED_FAILURE,
 812                                           wextev, NULL);
 813
 814         return 0;
 815 }
 816
 817 int cfg80211_disconnect(struct cfg80211_registered_device *rdev,
 818                         struct net_device *dev,
 819                         u16 reason, bool wextev)
 820 {
 821         int err;
 822
 823         wdev_lock(dev->ieee80211_ptr);
 824         err = __cfg80211_disconnect(rdev, dev, reason, wextev);
 825         wdev_unlock(dev->ieee80211_ptr);
 826
 827         return err;
 828 }
 829
 830 void cfg80211_sme_disassoc(struct net_device *dev, int idx)
 831 {
 832         struct wireless_dev *wdev = dev->ieee80211_ptr;
 833         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 834         u8 bssid[ETH_ALEN];
 835
 836         ASSERT_WDEV_LOCK(wdev);
 837
 838         if (!wdev->conn)
 839                 return;
 840
 841         if (wdev->conn->state == CFG80211_CONN_IDLE)
 842                 return;
 843
 844         /*
 845          * Ok, so the association was made by this SME -- we don't
 846          * want it any more so deauthenticate too.
 847          */
 848
 849         if (!wdev->auth_bsses[idx])
 850                 return;
 851
 852         memcpy(bssid, wdev->auth_bsses[idx]->pub.bssid, ETH_ALEN);
 853         if (__cfg80211_mlme_deauth(rdev, dev, bssid,
 854                                    NULL, 0, WLAN_REASON_DEAUTH_LEAVING)) {
 855                 /* whatever -- assume gone anyway */
 856                 cfg80211_unhold_bss(wdev->auth_bsses[idx]);
 857                 cfg80211_put_bss(&wdev->auth_bsses[idx]->pub);
 858                 wdev->auth_bsses[idx] = NULL;
 859         }
 860 }