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], prev_bssid[ETH_ALEN];
  31         u8 *ie;
  32         size_t ie_len;
  33         bool auto_auth, prev_bssid_valid;
  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         if (wdev->conn->params.channel)
  69                 request->channels[0] = wdev->conn->params.channel;
  70         else {
  71                 int i = 0, j;
  72                 enum ieee80211_band band;
  73
  74                 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
  75                         if (!wdev->wiphy->bands[band])
  76                                 continue;
  77                         for (j = 0; j < wdev->wiphy->bands[band]->n_channels;
  78                              i++, j++)
  79                                 request->channels[i] =
  80                                         &wdev->wiphy->bands[band]->channels[j];
  81                 }
  82         }
  83         request->n_channels = n_channels;
  84         request->ssids = (void *)&request->channels[n_channels];
  85         request->n_ssids = 1;
  86
  87         memcpy(request->ssids[0].ssid, wdev->conn->params.ssid,
  88                 wdev->conn->params.ssid_len);
  89         request->ssids[0].ssid_len = wdev->conn->params.ssid_len;
  90
  91         request->dev = wdev->netdev;
  92         request->wiphy = &rdev->wiphy;
  93
  94         rdev->scan_req = request;
  95
  96         err = rdev->ops->scan(wdev->wiphy, wdev->netdev, request);
  97         if (!err) {
  98                 wdev->conn->state = CFG80211_CONN_SCANNING;
  99                 nl80211_send_scan_start(rdev, wdev->netdev);
 100                 dev_hold(wdev->netdev);
 101         } else {
 102                 rdev->scan_req = NULL;
 103                 kfree(request);
 104         }
 105         return err;
 106 }
 107
 108 static int cfg80211_conn_do_work(struct wireless_dev *wdev)
 109 {
 110         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 111         struct cfg80211_connect_params *params;
 112         const u8 *prev_bssid = NULL;
 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                 if (wdev->conn->prev_bssid_valid)
 139                         prev_bssid = wdev->conn->prev_bssid;
 140                 err = __cfg80211_mlme_assoc(rdev, wdev->netdev,
 141                                             params->channel, params->bssid,
 142                                             prev_bssid,
 143                                             params->ssid, params->ssid_len,
 144                                             params->ie, params->ie_len,
 145                                             false, &params->crypto);
 146                 if (err)
 147                         __cfg80211_mlme_deauth(rdev, wdev->netdev, params->bssid,
 148                                                NULL, 0,
 149                                                WLAN_REASON_DEAUTH_LEAVING);
 150                 return err;
 151         default:
 152                 return 0;
 153         }
 154 }
 155
 156 void cfg80211_conn_work(struct work_struct *work)
 157 {
 158         struct cfg80211_registered_device *rdev =
 159                 container_of(work, struct cfg80211_registered_device, conn_work);
 160         struct wireless_dev *wdev;
 161
 162         rtnl_lock();
 163         cfg80211_lock_rdev(rdev);
 164         mutex_lock(&rdev->devlist_mtx);
 165
 166         list_for_each_entry(wdev, &rdev->netdev_list, list) {
 167                 wdev_lock(wdev);
 168                 if (!netif_running(wdev->netdev)) {
 169                         wdev_unlock(wdev);
 170                         continue;
 171                 }
 172                 if (wdev->sme_state != CFG80211_SME_CONNECTING) {
 173                         wdev_unlock(wdev);
 174                         continue;
 175                 }
 176                 if (cfg80211_conn_do_work(wdev))
 177                         __cfg80211_connect_result(
 178                                         wdev->netdev,
 179                                         wdev->conn->params.bssid,
 180                                         NULL, 0, NULL, 0,
 181                                         WLAN_STATUS_UNSPECIFIED_FAILURE,
 182                                         false, NULL);
 183                 wdev_unlock(wdev);
 184         }
 185
 186         mutex_unlock(&rdev->devlist_mtx);
 187         cfg80211_unlock_rdev(rdev);
 188         rtnl_unlock();
 189 }
 190
 191 static bool cfg80211_get_conn_bss(struct wireless_dev *wdev)
 192 {
 193         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 194         struct cfg80211_bss *bss;
 195         u16 capa = WLAN_CAPABILITY_ESS;
 196
 197         ASSERT_WDEV_LOCK(wdev);
 198
 199         if (wdev->conn->params.privacy)
 200                 capa |= WLAN_CAPABILITY_PRIVACY;
 201
 202         bss = cfg80211_get_bss(wdev->wiphy, NULL, wdev->conn->params.bssid,
 203                                wdev->conn->params.ssid,
 204                                wdev->conn->params.ssid_len,
 205                                WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_PRIVACY,
 206                                capa);
 207         if (!bss)
 208                 return false;
 209
 210         memcpy(wdev->conn->bssid, bss->bssid, ETH_ALEN);
 211         wdev->conn->params.bssid = wdev->conn->bssid;
 212         wdev->conn->params.channel = bss->channel;
 213         wdev->conn->state = CFG80211_CONN_AUTHENTICATE_NEXT;
 214         schedule_work(&rdev->conn_work);
 215
 216         cfg80211_put_bss(bss);
 217         return true;
 218 }
 219
 220 static void __cfg80211_sme_scan_done(struct net_device *dev)
 221 {
 222         struct wireless_dev *wdev = dev->ieee80211_ptr;
 223         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 224
 225         ASSERT_WDEV_LOCK(wdev);
 226
 227         if (wdev->sme_state != CFG80211_SME_CONNECTING)
 228                 return;
 229
 230         if (!wdev->conn)
 231                 return;
 232
 233         if (wdev->conn->state != CFG80211_CONN_SCANNING &&
 234             wdev->conn->state != CFG80211_CONN_SCAN_AGAIN)
 235                 return;
 236
 237         if (!cfg80211_get_conn_bss(wdev)) {
 238                 /* not found */
 239                 if (wdev->conn->state == CFG80211_CONN_SCAN_AGAIN)
 240                         schedule_work(&rdev->conn_work);
 241                 else
 242                         __cfg80211_connect_result(
 243                                         wdev->netdev,
 244                                         wdev->conn->params.bssid,
 245                                         NULL, 0, NULL, 0,
 246                                         WLAN_STATUS_UNSPECIFIED_FAILURE,
 247                                         false, NULL);
 248         }
 249 }
 250
 251 void cfg80211_sme_scan_done(struct net_device *dev)
 252 {
 253         struct wireless_dev *wdev = dev->ieee80211_ptr;
 254
 255         mutex_lock(&wiphy_to_dev(wdev->wiphy)->devlist_mtx);
 256         wdev_lock(wdev);
 257         __cfg80211_sme_scan_done(dev);
 258         wdev_unlock(wdev);
 259         mutex_unlock(&wiphy_to_dev(wdev->wiphy)->devlist_mtx);
 260 }
 261
 262 void cfg80211_sme_rx_auth(struct net_device *dev,
 263                           const u8 *buf, size_t len)
 264 {
 265         struct wireless_dev *wdev = dev->ieee80211_ptr;
 266         struct wiphy *wiphy = wdev->wiphy;
 267         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 268         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)buf;
 269         u16 status_code = le16_to_cpu(mgmt->u.auth.status_code);
 270
 271         ASSERT_WDEV_LOCK(wdev);
 272
 273         /* should only RX auth frames when connecting */
 274         if (wdev->sme_state != CFG80211_SME_CONNECTING)
 275                 return;
 276
 277         if (WARN_ON(!wdev->conn))
 278                 return;
 279
 280         if (status_code == WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG &&
 281             wdev->conn->auto_auth &&
 282             wdev->conn->params.auth_type != NL80211_AUTHTYPE_NETWORK_EAP) {
 283                 /* select automatically between only open, shared, leap */
 284                 switch (wdev->conn->params.auth_type) {
 285                 case NL80211_AUTHTYPE_OPEN_SYSTEM:
 286                         if (wdev->connect_keys)
 287                                 wdev->conn->params.auth_type =
 288                                         NL80211_AUTHTYPE_SHARED_KEY;
 289                         else
 290                                 wdev->conn->params.auth_type =
 291                                         NL80211_AUTHTYPE_NETWORK_EAP;
 292                         break;
 293                 case NL80211_AUTHTYPE_SHARED_KEY:
 294                         wdev->conn->params.auth_type =
 295                                 NL80211_AUTHTYPE_NETWORK_EAP;
 296                         break;
 297                 default:
 298                         /* huh? */
 299                         wdev->conn->params.auth_type =
 300                                 NL80211_AUTHTYPE_OPEN_SYSTEM;
 301                         break;
 302                 }
 303                 wdev->conn->state = CFG80211_CONN_AUTHENTICATE_NEXT;
 304                 schedule_work(&rdev->conn_work);
 305         } else if (status_code != WLAN_STATUS_SUCCESS) {
 306                 __cfg80211_connect_result(dev, mgmt->bssid, NULL, 0, NULL, 0,
 307                                           status_code, false, NULL);
 308         } else if (wdev->sme_state == CFG80211_SME_CONNECTING &&
 309                  wdev->conn->state == CFG80211_CONN_AUTHENTICATING) {
 310                 wdev->conn->state = CFG80211_CONN_ASSOCIATE_NEXT;
 311                 schedule_work(&rdev->conn_work);
 312         }
 313 }
 314
 315 bool cfg80211_sme_failed_reassoc(struct wireless_dev *wdev)
 316 {
 317         struct wiphy *wiphy = wdev->wiphy;
 318         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 319
 320         if (WARN_ON(!wdev->conn))
 321                 return false;
 322
 323         if (!wdev->conn->prev_bssid_valid)
 324                 return false;
 325
 326         /*
 327          * Some stupid APs don't accept reassoc, so we
 328          * need to fall back to trying regular assoc.
 329          */
 330         wdev->conn->prev_bssid_valid = false;
 331         wdev->conn->state = CFG80211_CONN_ASSOCIATE_NEXT;
 332         schedule_work(&rdev->conn_work);
 333
 334         return true;
 335 }
 336
 337 void __cfg80211_connect_result(struct net_device *dev, const u8 *bssid,
 338                                const u8 *req_ie, size_t req_ie_len,
 339                                const u8 *resp_ie, size_t resp_ie_len,
 340                                u16 status, bool wextev,
 341                                struct cfg80211_bss *bss)
 342 {
 343         struct wireless_dev *wdev = dev->ieee80211_ptr;
 344         u8 *country_ie;
 345 #ifdef CONFIG_WIRELESS_EXT
 346         union iwreq_data wrqu;
 347 #endif
 348
 349         ASSERT_WDEV_LOCK(wdev);
 350
 351         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
 352                 return;
 353
 354         if (WARN_ON(wdev->sme_state != CFG80211_SME_CONNECTING))
 355                 return;
 356
 357         nl80211_send_connect_result(wiphy_to_dev(wdev->wiphy), dev,
 358                                     bssid, req_ie, req_ie_len,
 359                                     resp_ie, resp_ie_len,
 360                                     status, GFP_KERNEL);
 361
 362 #ifdef CONFIG_WIRELESS_EXT
 363         if (wextev) {
 364                 if (req_ie && status == WLAN_STATUS_SUCCESS) {
 365                         memset(&wrqu, 0, sizeof(wrqu));
 366                         wrqu.data.length = req_ie_len;
 367                         wireless_send_event(dev, IWEVASSOCREQIE, &wrqu, req_ie);
 368                 }
 369
 370                 if (resp_ie && status == WLAN_STATUS_SUCCESS) {
 371                         memset(&wrqu, 0, sizeof(wrqu));
 372                         wrqu.data.length = resp_ie_len;
 373                         wireless_send_event(dev, IWEVASSOCRESPIE, &wrqu, resp_ie);
 374                 }
 375
 376                 memset(&wrqu, 0, sizeof(wrqu));
 377                 wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 378                 if (bssid && status == WLAN_STATUS_SUCCESS) {
 379                         memcpy(wrqu.ap_addr.sa_data, bssid, ETH_ALEN);
 380                         memcpy(wdev->wext.prev_bssid, bssid, ETH_ALEN);
 381                         wdev->wext.prev_bssid_valid = true;
 382                 }
 383                 wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL);
 384         }
 385 #endif
 386
 387         if (wdev->current_bss) {
 388                 cfg80211_unhold_bss(wdev->current_bss);
 389                 cfg80211_put_bss(&wdev->current_bss->pub);
 390                 wdev->current_bss = NULL;
 391         }
 392
 393         if (wdev->conn)
 394                 wdev->conn->state = CFG80211_CONN_IDLE;
 395
 396         if (status != WLAN_STATUS_SUCCESS) {
 397                 wdev->sme_state = CFG80211_SME_IDLE;
 398                 kfree(wdev->conn);
 399                 wdev->conn = NULL;
 400                 kfree(wdev->connect_keys);
 401                 wdev->connect_keys = NULL;
 402                 wdev->ssid_len = 0;
 403                 return;
 404         }
 405
 406         if (!bss)
 407                 bss = cfg80211_get_bss(wdev->wiphy, NULL, bssid,
 408                                        wdev->ssid, wdev->ssid_len,
 409                                        WLAN_CAPABILITY_ESS,
 410                                        WLAN_CAPABILITY_ESS);
 411
 412         if (WARN_ON(!bss))
 413                 return;
 414
 415         cfg80211_hold_bss(bss_from_pub(bss));
 416         wdev->current_bss = bss_from_pub(bss);
 417
 418         wdev->sme_state = CFG80211_SME_CONNECTED;
 419         cfg80211_upload_connect_keys(wdev);
 420
 421         country_ie = (u8 *) ieee80211_bss_get_ie(bss, WLAN_EID_COUNTRY);
 422
 423         if (!country_ie)
 424                 return;
 425
 426         /*
 427          * ieee80211_bss_get_ie() ensures we can access:
 428          * - country_ie + 2, the start of the country ie data, and
 429          * - and country_ie[1] which is the IE length
 430          */
 431         regulatory_hint_11d(wdev->wiphy,
 432                             country_ie + 2,
 433                             country_ie[1]);
 434 }
 435
 436 void cfg80211_connect_result(struct net_device *dev, const u8 *bssid,
 437                              const u8 *req_ie, size_t req_ie_len,
 438                              const u8 *resp_ie, size_t resp_ie_len,
 439                              u16 status, gfp_t gfp)
 440 {
 441         struct wireless_dev *wdev = dev->ieee80211_ptr;
 442         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 443         struct cfg80211_event *ev;
 444         unsigned long flags;
 445
 446         ev = kzalloc(sizeof(*ev) + req_ie_len + resp_ie_len, gfp);
 447         if (!ev)
 448                 return;
 449
 450         ev->type = EVENT_CONNECT_RESULT;
 451         memcpy(ev->cr.bssid, bssid, ETH_ALEN);
 452         ev->cr.req_ie = ((u8 *)ev) + sizeof(*ev);
 453         ev->cr.req_ie_len = req_ie_len;
 454         memcpy((void *)ev->cr.req_ie, req_ie, req_ie_len);
 455         ev->cr.resp_ie = ((u8 *)ev) + sizeof(*ev) + req_ie_len;
 456         ev->cr.resp_ie_len = resp_ie_len;
 457         memcpy((void *)ev->cr.resp_ie, resp_ie, resp_ie_len);
 458         ev->cr.status = status;
 459
 460         spin_lock_irqsave(&wdev->event_lock, flags);
 461         list_add_tail(&ev->list, &wdev->event_list);
 462         spin_unlock_irqrestore(&wdev->event_lock, flags);
 463         schedule_work(&rdev->event_work);
 464 }
 465 EXPORT_SYMBOL(cfg80211_connect_result);
 466
 467 void __cfg80211_roamed(struct wireless_dev *wdev, const u8 *bssid,
 468                        const u8 *req_ie, size_t req_ie_len,
 469                        const u8 *resp_ie, size_t resp_ie_len)
 470 {
 471         struct cfg80211_bss *bss;
 472 #ifdef CONFIG_WIRELESS_EXT
 473         union iwreq_data wrqu;
 474 #endif
 475
 476         ASSERT_WDEV_LOCK(wdev);
 477
 478         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
 479                 return;
 480
 481         if (WARN_ON(wdev->sme_state != CFG80211_SME_CONNECTED))
 482                 return;
 483
 484         /* internal error -- how did we get to CONNECTED w/o BSS? */
 485         if (WARN_ON(!wdev->current_bss)) {
 486                 return;
 487         }
 488
 489         cfg80211_unhold_bss(wdev->current_bss);
 490         cfg80211_put_bss(&wdev->current_bss->pub);
 491         wdev->current_bss = NULL;
 492
 493         bss = cfg80211_get_bss(wdev->wiphy, NULL, bssid,
 494                                wdev->ssid, wdev->ssid_len,
 495                                WLAN_CAPABILITY_ESS, WLAN_CAPABILITY_ESS);
 496
 497         if (WARN_ON(!bss))
 498                 return;
 499
 500         cfg80211_hold_bss(bss_from_pub(bss));
 501         wdev->current_bss = bss_from_pub(bss);
 502
 503         nl80211_send_roamed(wiphy_to_dev(wdev->wiphy), wdev->netdev, bssid,
 504                             req_ie, req_ie_len, resp_ie, resp_ie_len,
 505                             GFP_KERNEL);
 506
 507 #ifdef CONFIG_WIRELESS_EXT
 508         if (req_ie) {
 509                 memset(&wrqu, 0, sizeof(wrqu));
 510                 wrqu.data.length = req_ie_len;
 511                 wireless_send_event(wdev->netdev, IWEVASSOCREQIE,
 512                                     &wrqu, req_ie);
 513         }
 514
 515         if (resp_ie) {
 516                 memset(&wrqu, 0, sizeof(wrqu));
 517                 wrqu.data.length = resp_ie_len;
 518                 wireless_send_event(wdev->netdev, IWEVASSOCRESPIE,
 519                                     &wrqu, resp_ie);
 520         }
 521
 522         memset(&wrqu, 0, sizeof(wrqu));
 523         wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 524         memcpy(wrqu.ap_addr.sa_data, bssid, ETH_ALEN);
 525         memcpy(wdev->wext.prev_bssid, bssid, ETH_ALEN);
 526         wdev->wext.prev_bssid_valid = true;
 527         wireless_send_event(wdev->netdev, SIOCGIWAP, &wrqu, NULL);
 528 #endif
 529 }
 530
 531 void cfg80211_roamed(struct net_device *dev, const u8 *bssid,
 532                      const u8 *req_ie, size_t req_ie_len,
 533                      const u8 *resp_ie, size_t resp_ie_len, gfp_t gfp)
 534 {
 535         struct wireless_dev *wdev = dev->ieee80211_ptr;
 536         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 537         struct cfg80211_event *ev;
 538         unsigned long flags;
 539
 540         ev = kzalloc(sizeof(*ev) + req_ie_len + resp_ie_len, gfp);
 541         if (!ev)
 542                 return;
 543
 544         ev->type = EVENT_ROAMED;
 545         memcpy(ev->rm.bssid, bssid, ETH_ALEN);
 546         ev->rm.req_ie = ((u8 *)ev) + sizeof(*ev);
 547         ev->rm.req_ie_len = req_ie_len;
 548         memcpy((void *)ev->rm.req_ie, req_ie, req_ie_len);
 549         ev->rm.resp_ie = ((u8 *)ev) + sizeof(*ev) + req_ie_len;
 550         ev->rm.resp_ie_len = resp_ie_len;
 551         memcpy((void *)ev->rm.resp_ie, resp_ie, resp_ie_len);
 552
 553         spin_lock_irqsave(&wdev->event_lock, flags);
 554         list_add_tail(&ev->list, &wdev->event_list);
 555         spin_unlock_irqrestore(&wdev->event_lock, flags);
 556         schedule_work(&rdev->event_work);
 557 }
 558 EXPORT_SYMBOL(cfg80211_roamed);
 559
 560 void __cfg80211_disconnected(struct net_device *dev, const u8 *ie,
 561                              size_t ie_len, u16 reason, bool from_ap)
 562 {
 563         struct wireless_dev *wdev = dev->ieee80211_ptr;
 564         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 565         int i;
 566 #ifdef CONFIG_WIRELESS_EXT
 567         union iwreq_data wrqu;
 568 #endif
 569
 570         ASSERT_WDEV_LOCK(wdev);
 571
 572         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
 573                 return;
 574
 575         if (WARN_ON(wdev->sme_state != CFG80211_SME_CONNECTED))
 576                 return;
 577
 578         if (wdev->current_bss) {
 579                 cfg80211_unhold_bss(wdev->current_bss);
 580                 cfg80211_put_bss(&wdev->current_bss->pub);
 581         }
 582
 583         wdev->current_bss = NULL;
 584         wdev->sme_state = CFG80211_SME_IDLE;
 585         wdev->ssid_len = 0;
 586
 587         if (wdev->conn) {
 588                 const u8 *bssid;
 589                 int ret;
 590
 591                 kfree(wdev->conn->ie);
 592                 wdev->conn->ie = NULL;
 593                 kfree(wdev->conn);
 594                 wdev->conn = NULL;
 595
 596                 /*
 597                  * If this disconnect was due to a disassoc, we
 598                  * we might still have an auth BSS around. For
 599                  * the userspace SME that's currently expected,
 600                  * but for the kernel SME (nl80211 CONNECT or
 601                  * wireless extensions) we want to clear up all
 602                  * state.
 603                  */
 604                 for (i = 0; i < MAX_AUTH_BSSES; i++) {
 605                         if (!wdev->auth_bsses[i])
 606                                 continue;
 607                         bssid = wdev->auth_bsses[i]->pub.bssid;
 608                         ret = __cfg80211_mlme_deauth(rdev, dev, bssid, NULL, 0,
 609                                                 WLAN_REASON_DEAUTH_LEAVING);
 610                         WARN(ret, "deauth failed: %d\n", ret);
 611                 }
 612         }
 613
 614         nl80211_send_disconnected(rdev, dev, reason, ie, ie_len, from_ap);
 615
 616         /*
 617          * Delete all the keys ... pairwise keys can't really
 618          * exist any more anyway, but default keys might.
 619          */
 620         if (rdev->ops->del_key)
 621                 for (i = 0; i < 6; i++)
 622                         rdev->ops->del_key(wdev->wiphy, dev, i, NULL);
 623
 624 #ifdef CONFIG_WIRELESS_EXT
 625         memset(&wrqu, 0, sizeof(wrqu));
 626         wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 627         wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL);
 628 #endif
 629 }
 630
 631 void cfg80211_disconnected(struct net_device *dev, u16 reason,
 632                            u8 *ie, size_t ie_len, gfp_t gfp)
 633 {
 634         struct wireless_dev *wdev = dev->ieee80211_ptr;
 635         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 636         struct cfg80211_event *ev;
 637         unsigned long flags;
 638
 639         ev = kzalloc(sizeof(*ev) + ie_len, gfp);
 640         if (!ev)
 641                 return;
 642
 643         ev->type = EVENT_DISCONNECTED;
 644         ev->dc.ie = ((u8 *)ev) + sizeof(*ev);
 645         ev->dc.ie_len = ie_len;
 646         memcpy((void *)ev->dc.ie, ie, ie_len);
 647         ev->dc.reason = reason;
 648
 649         spin_lock_irqsave(&wdev->event_lock, flags);
 650         list_add_tail(&ev->list, &wdev->event_list);
 651         spin_unlock_irqrestore(&wdev->event_lock, flags);
 652         schedule_work(&rdev->event_work);
 653 }
 654 EXPORT_SYMBOL(cfg80211_disconnected);
 655
 656 int __cfg80211_connect(struct cfg80211_registered_device *rdev,
 657                        struct net_device *dev,
 658                        struct cfg80211_connect_params *connect,
 659                        struct cfg80211_cached_keys *connkeys,
 660                        const u8 *prev_bssid)
 661 {
 662         struct wireless_dev *wdev = dev->ieee80211_ptr;
 663         struct ieee80211_channel *chan;
 664         int err;
 665
 666         ASSERT_WDEV_LOCK(wdev);
 667
 668         if (wdev->sme_state != CFG80211_SME_IDLE)
 669                 return -EALREADY;
 670
 671         chan = rdev_fixed_channel(rdev, wdev);
 672         if (chan && chan != connect->channel)
 673                 return -EBUSY;
 674
 675         if (WARN_ON(wdev->connect_keys)) {
 676                 kfree(wdev->connect_keys);
 677                 wdev->connect_keys = NULL;
 678         }
 679
 680         if (connkeys && connkeys->def >= 0) {
 681                 int idx;
 682                 u32 cipher;
 683
 684                 idx = connkeys->def;
 685                 cipher = connkeys->params[idx].cipher;
 686                 /* If given a WEP key we may need it for shared key auth */
 687                 if (cipher == WLAN_CIPHER_SUITE_WEP40 ||
 688                     cipher == WLAN_CIPHER_SUITE_WEP104) {
 689                         connect->key_idx = idx;
 690                         connect->key = connkeys->params[idx].key;
 691                         connect->key_len = connkeys->params[idx].key_len;
 692
 693                         /*
 694                          * If ciphers are not set (e.g. when going through
 695                          * iwconfig), we have to set them appropriately here.
 696                          */
 697                         if (connect->crypto.cipher_group == 0)
 698                                 connect->crypto.cipher_group = cipher;
 699
 700                         if (connect->crypto.n_ciphers_pairwise == 0) {
 701                                 connect->crypto.n_ciphers_pairwise = 1;
 702                                 connect->crypto.ciphers_pairwise[0] = cipher;
 703                         }
 704                 }
 705         }
 706
 707         if (!rdev->ops->connect) {
 708                 if (!rdev->ops->auth || !rdev->ops->assoc)
 709                         return -EOPNOTSUPP;
 710
 711                 if (WARN_ON(wdev->conn))
 712                         return -EINPROGRESS;
 713
 714                 wdev->conn = kzalloc(sizeof(*wdev->conn), GFP_KERNEL);
 715                 if (!wdev->conn)
 716                         return -ENOMEM;
 717
 718                 /*
 719                  * Copy all parameters, and treat explicitly IEs, BSSID, SSID.
 720                  */
 721                 memcpy(&wdev->conn->params, connect, sizeof(*connect));
 722                 if (connect->bssid) {
 723                         wdev->conn->params.bssid = wdev->conn->bssid;
 724                         memcpy(wdev->conn->bssid, connect->bssid, ETH_ALEN);
 725                 }
 726
 727                 if (connect->ie) {
 728                         wdev->conn->ie = kmemdup(connect->ie, connect->ie_len,
 729                                                 GFP_KERNEL);
 730                         wdev->conn->params.ie = wdev->conn->ie;
 731                         if (!wdev->conn->ie) {
 732                                 kfree(wdev->conn);
 733                                 wdev->conn = NULL;
 734                                 return -ENOMEM;
 735                         }
 736                 }
 737
 738                 if (connect->auth_type == NL80211_AUTHTYPE_AUTOMATIC) {
 739                         wdev->conn->auto_auth = true;
 740                         /* start with open system ... should mostly work */
 741                         wdev->conn->params.auth_type =
 742                                 NL80211_AUTHTYPE_OPEN_SYSTEM;
 743                 } else {
 744                         wdev->conn->auto_auth = false;
 745                 }
 746
 747                 memcpy(wdev->ssid, connect->ssid, connect->ssid_len);
 748                 wdev->ssid_len = connect->ssid_len;
 749                 wdev->conn->params.ssid = wdev->ssid;
 750                 wdev->conn->params.ssid_len = connect->ssid_len;
 751
 752                 /* don't care about result -- but fill bssid & channel */
 753                 if (!wdev->conn->params.bssid || !wdev->conn->params.channel)
 754                         cfg80211_get_conn_bss(wdev);
 755
 756                 wdev->sme_state = CFG80211_SME_CONNECTING;
 757                 wdev->connect_keys = connkeys;
 758
 759                 if (prev_bssid) {
 760                         memcpy(wdev->conn->prev_bssid, prev_bssid, ETH_ALEN);
 761                         wdev->conn->prev_bssid_valid = true;
 762                 }
 763
 764                 /* we're good if we have both BSSID and channel */
 765                 if (wdev->conn->params.bssid && wdev->conn->params.channel) {
 766                         wdev->conn->state = CFG80211_CONN_AUTHENTICATE_NEXT;
 767                         err = cfg80211_conn_do_work(wdev);
 768                 } else {
 769                         /* otherwise we'll need to scan for the AP first */
 770                         err = cfg80211_conn_scan(wdev);
 771                         /*
 772                          * If we can't scan right now, then we need to scan again
 773                          * after the current scan finished, since the parameters
 774                          * changed (unless we find a good AP anyway).
 775                          */
 776                         if (err == -EBUSY) {
 777                                 err = 0;
 778                                 wdev->conn->state = CFG80211_CONN_SCAN_AGAIN;
 779                         }
 780                 }
 781                 if (err) {
 782                         kfree(wdev->conn);
 783                         wdev->conn = NULL;
 784                         wdev->sme_state = CFG80211_SME_IDLE;
 785                         wdev->connect_keys = NULL;
 786                         wdev->ssid_len = 0;
 787                 }
 788
 789                 return err;
 790         } else {
 791                 wdev->sme_state = CFG80211_SME_CONNECTING;
 792                 wdev->connect_keys = connkeys;
 793                 err = rdev->ops->connect(&rdev->wiphy, dev, connect);
 794                 if (err) {
 795                         wdev->connect_keys = NULL;
 796                         wdev->sme_state = CFG80211_SME_IDLE;
 797                         return err;
 798                 }
 799
 800                 memcpy(wdev->ssid, connect->ssid, connect->ssid_len);
 801                 wdev->ssid_len = connect->ssid_len;
 802
 803                 return 0;
 804         }
 805 }
 806
 807 int cfg80211_connect(struct cfg80211_registered_device *rdev,
 808                      struct net_device *dev,
 809                      struct cfg80211_connect_params *connect,
 810                      struct cfg80211_cached_keys *connkeys)
 811 {
 812         int err;
 813
 814         mutex_lock(&rdev->devlist_mtx);
 815         wdev_lock(dev->ieee80211_ptr);
 816         err = __cfg80211_connect(rdev, dev, connect, connkeys, NULL);
 817         wdev_unlock(dev->ieee80211_ptr);
 818         mutex_unlock(&rdev->devlist_mtx);
 819
 820         return err;
 821 }
 822
 823 int __cfg80211_disconnect(struct cfg80211_registered_device *rdev,
 824                           struct net_device *dev, u16 reason, bool wextev)
 825 {
 826         struct wireless_dev *wdev = dev->ieee80211_ptr;
 827         int err;
 828
 829         ASSERT_WDEV_LOCK(wdev);
 830
 831         if (wdev->sme_state == CFG80211_SME_IDLE)
 832                 return -EINVAL;
 833
 834         kfree(wdev->connect_keys);
 835         wdev->connect_keys = NULL;
 836
 837         if (!rdev->ops->disconnect) {
 838                 if (!rdev->ops->deauth)
 839                         return -EOPNOTSUPP;
 840
 841                 /* was it connected by userspace SME? */
 842                 if (!wdev->conn) {
 843                         cfg80211_mlme_down(rdev, dev);
 844                         return 0;
 845                 }
 846
 847                 if (wdev->sme_state == CFG80211_SME_CONNECTING &&
 848                     (wdev->conn->state == CFG80211_CONN_SCANNING ||
 849                      wdev->conn->state == CFG80211_CONN_SCAN_AGAIN)) {
 850                         wdev->sme_state = CFG80211_SME_IDLE;
 851                         kfree(wdev->conn);
 852                         wdev->conn = NULL;
 853                         wdev->ssid_len = 0;
 854                         return 0;
 855                 }
 856
 857                 /* wdev->conn->params.bssid must be set if > SCANNING */
 858                 err = __cfg80211_mlme_deauth(rdev, dev,
 859                                              wdev->conn->params.bssid,
 860                                              NULL, 0, reason);
 861                 if (err)
 862                         return err;
 863         } else {
 864                 err = rdev->ops->disconnect(&rdev->wiphy, dev, reason);
 865                 if (err)
 866                         return err;
 867         }
 868
 869         if (wdev->sme_state == CFG80211_SME_CONNECTED)
 870                 __cfg80211_disconnected(dev, NULL, 0, 0, false);
 871         else if (wdev->sme_state == CFG80211_SME_CONNECTING)
 872                 __cfg80211_connect_result(dev, NULL, NULL, 0, NULL, 0,
 873                                           WLAN_STATUS_UNSPECIFIED_FAILURE,
 874                                           wextev, NULL);
 875
 876         return 0;
 877 }
 878
 879 int cfg80211_disconnect(struct cfg80211_registered_device *rdev,
 880                         struct net_device *dev,
 881                         u16 reason, bool wextev)
 882 {
 883         int err;
 884
 885         wdev_lock(dev->ieee80211_ptr);
 886         err = __cfg80211_disconnect(rdev, dev, reason, wextev);
 887         wdev_unlock(dev->ieee80211_ptr);
 888
 889         return err;
 890 }
 891
 892 void cfg80211_sme_disassoc(struct net_device *dev, int idx)
 893 {
 894         struct wireless_dev *wdev = dev->ieee80211_ptr;
 895         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 896         u8 bssid[ETH_ALEN];
 897
 898         ASSERT_WDEV_LOCK(wdev);
 899
 900         if (!wdev->conn)
 901                 return;
 902
 903         if (wdev->conn->state == CFG80211_CONN_IDLE)
 904                 return;
 905
 906         /*
 907          * Ok, so the association was made by this SME -- we don't
 908          * want it any more so deauthenticate too.
 909          */
 910
 911         if (!wdev->auth_bsses[idx])
 912                 return;
 913
 914         memcpy(bssid, wdev->auth_bsses[idx]->pub.bssid, ETH_ALEN);
 915         if (__cfg80211_mlme_deauth(rdev, dev, bssid,
 916                                    NULL, 0, WLAN_REASON_DEAUTH_LEAVING)) {
 917                 /* whatever -- assume gone anyway */
 918                 cfg80211_unhold_bss(wdev->auth_bsses[idx]);
 919                 cfg80211_put_bss(&wdev->auth_bsses[idx]->pub);
 920                 wdev->auth_bsses[idx] = NULL;
 921         }
 922 }