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                 if (wdev->conn)
 399                         kfree(wdev->conn->ie);
 400                 kfree(wdev->conn);
 401                 wdev->conn = NULL;
 402                 kfree(wdev->connect_keys);
 403                 wdev->connect_keys = NULL;
 404                 wdev->ssid_len = 0;
 405                 return;
 406         }
 407
 408         if (!bss)
 409                 bss = cfg80211_get_bss(wdev->wiphy, NULL, bssid,
 410                                        wdev->ssid, wdev->ssid_len,
 411                                        WLAN_CAPABILITY_ESS,
 412                                        WLAN_CAPABILITY_ESS);
 413
 414         if (WARN_ON(!bss))
 415                 return;
 416
 417         cfg80211_hold_bss(bss_from_pub(bss));
 418         wdev->current_bss = bss_from_pub(bss);
 419
 420         wdev->sme_state = CFG80211_SME_CONNECTED;
 421         cfg80211_upload_connect_keys(wdev);
 422
 423         country_ie = (u8 *) ieee80211_bss_get_ie(bss, WLAN_EID_COUNTRY);
 424
 425         if (!country_ie)
 426                 return;
 427
 428         /*
 429          * ieee80211_bss_get_ie() ensures we can access:
 430          * - country_ie + 2, the start of the country ie data, and
 431          * - and country_ie[1] which is the IE length
 432          */
 433         regulatory_hint_11d(wdev->wiphy,
 434                             country_ie + 2,
 435                             country_ie[1]);
 436 }
 437
 438 void cfg80211_connect_result(struct net_device *dev, const u8 *bssid,
 439                              const u8 *req_ie, size_t req_ie_len,
 440                              const u8 *resp_ie, size_t resp_ie_len,
 441                              u16 status, gfp_t gfp)
 442 {
 443         struct wireless_dev *wdev = dev->ieee80211_ptr;
 444         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 445         struct cfg80211_event *ev;
 446         unsigned long flags;
 447
 448         ev = kzalloc(sizeof(*ev) + req_ie_len + resp_ie_len, gfp);
 449         if (!ev)
 450                 return;
 451
 452         ev->type = EVENT_CONNECT_RESULT;
 453         if (bssid)
 454                 memcpy(ev->cr.bssid, bssid, ETH_ALEN);
 455         ev->cr.req_ie = ((u8 *)ev) + sizeof(*ev);
 456         ev->cr.req_ie_len = req_ie_len;
 457         memcpy((void *)ev->cr.req_ie, req_ie, req_ie_len);
 458         ev->cr.resp_ie = ((u8 *)ev) + sizeof(*ev) + req_ie_len;
 459         ev->cr.resp_ie_len = resp_ie_len;
 460         memcpy((void *)ev->cr.resp_ie, resp_ie, resp_ie_len);
 461         ev->cr.status = status;
 462
 463         spin_lock_irqsave(&wdev->event_lock, flags);
 464         list_add_tail(&ev->list, &wdev->event_list);
 465         spin_unlock_irqrestore(&wdev->event_lock, flags);
 466         schedule_work(&rdev->event_work);
 467 }
 468 EXPORT_SYMBOL(cfg80211_connect_result);
 469
 470 void __cfg80211_roamed(struct wireless_dev *wdev, const u8 *bssid,
 471                        const u8 *req_ie, size_t req_ie_len,
 472                        const u8 *resp_ie, size_t resp_ie_len)
 473 {
 474         struct cfg80211_bss *bss;
 475 #ifdef CONFIG_WIRELESS_EXT
 476         union iwreq_data wrqu;
 477 #endif
 478
 479         ASSERT_WDEV_LOCK(wdev);
 480
 481         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
 482                 return;
 483
 484         if (WARN_ON(wdev->sme_state != CFG80211_SME_CONNECTED))
 485                 return;
 486
 487         /* internal error -- how did we get to CONNECTED w/o BSS? */
 488         if (WARN_ON(!wdev->current_bss)) {
 489                 return;
 490         }
 491
 492         cfg80211_unhold_bss(wdev->current_bss);
 493         cfg80211_put_bss(&wdev->current_bss->pub);
 494         wdev->current_bss = NULL;
 495
 496         bss = cfg80211_get_bss(wdev->wiphy, NULL, bssid,
 497                                wdev->ssid, wdev->ssid_len,
 498                                WLAN_CAPABILITY_ESS, WLAN_CAPABILITY_ESS);
 499
 500         if (WARN_ON(!bss))
 501                 return;
 502
 503         cfg80211_hold_bss(bss_from_pub(bss));
 504         wdev->current_bss = bss_from_pub(bss);
 505
 506         nl80211_send_roamed(wiphy_to_dev(wdev->wiphy), wdev->netdev, bssid,
 507                             req_ie, req_ie_len, resp_ie, resp_ie_len,
 508                             GFP_KERNEL);
 509
 510 #ifdef CONFIG_WIRELESS_EXT
 511         if (req_ie) {
 512                 memset(&wrqu, 0, sizeof(wrqu));
 513                 wrqu.data.length = req_ie_len;
 514                 wireless_send_event(wdev->netdev, IWEVASSOCREQIE,
 515                                     &wrqu, req_ie);
 516         }
 517
 518         if (resp_ie) {
 519                 memset(&wrqu, 0, sizeof(wrqu));
 520                 wrqu.data.length = resp_ie_len;
 521                 wireless_send_event(wdev->netdev, IWEVASSOCRESPIE,
 522                                     &wrqu, resp_ie);
 523         }
 524
 525         memset(&wrqu, 0, sizeof(wrqu));
 526         wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 527         memcpy(wrqu.ap_addr.sa_data, bssid, ETH_ALEN);
 528         memcpy(wdev->wext.prev_bssid, bssid, ETH_ALEN);
 529         wdev->wext.prev_bssid_valid = true;
 530         wireless_send_event(wdev->netdev, SIOCGIWAP, &wrqu, NULL);
 531 #endif
 532 }
 533
 534 void cfg80211_roamed(struct net_device *dev, const u8 *bssid,
 535                      const u8 *req_ie, size_t req_ie_len,
 536                      const u8 *resp_ie, size_t resp_ie_len, gfp_t gfp)
 537 {
 538         struct wireless_dev *wdev = dev->ieee80211_ptr;
 539         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 540         struct cfg80211_event *ev;
 541         unsigned long flags;
 542
 543         ev = kzalloc(sizeof(*ev) + req_ie_len + resp_ie_len, gfp);
 544         if (!ev)
 545                 return;
 546
 547         ev->type = EVENT_ROAMED;
 548         memcpy(ev->rm.bssid, bssid, ETH_ALEN);
 549         ev->rm.req_ie = ((u8 *)ev) + sizeof(*ev);
 550         ev->rm.req_ie_len = req_ie_len;
 551         memcpy((void *)ev->rm.req_ie, req_ie, req_ie_len);
 552         ev->rm.resp_ie = ((u8 *)ev) + sizeof(*ev) + req_ie_len;
 553         ev->rm.resp_ie_len = resp_ie_len;
 554         memcpy((void *)ev->rm.resp_ie, resp_ie, resp_ie_len);
 555
 556         spin_lock_irqsave(&wdev->event_lock, flags);
 557         list_add_tail(&ev->list, &wdev->event_list);
 558         spin_unlock_irqrestore(&wdev->event_lock, flags);
 559         schedule_work(&rdev->event_work);
 560 }
 561 EXPORT_SYMBOL(cfg80211_roamed);
 562
 563 void __cfg80211_disconnected(struct net_device *dev, const u8 *ie,
 564                              size_t ie_len, u16 reason, bool from_ap)
 565 {
 566         struct wireless_dev *wdev = dev->ieee80211_ptr;
 567         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 568         int i;
 569 #ifdef CONFIG_WIRELESS_EXT
 570         union iwreq_data wrqu;
 571 #endif
 572
 573         ASSERT_WDEV_LOCK(wdev);
 574
 575         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
 576                 return;
 577
 578         if (WARN_ON(wdev->sme_state != CFG80211_SME_CONNECTED))
 579                 return;
 580
 581         if (wdev->current_bss) {
 582                 cfg80211_unhold_bss(wdev->current_bss);
 583                 cfg80211_put_bss(&wdev->current_bss->pub);
 584         }
 585
 586         wdev->current_bss = NULL;
 587         wdev->sme_state = CFG80211_SME_IDLE;
 588         wdev->ssid_len = 0;
 589
 590         if (wdev->conn) {
 591                 const u8 *bssid;
 592                 int ret;
 593
 594                 kfree(wdev->conn->ie);
 595                 wdev->conn->ie = NULL;
 596                 kfree(wdev->conn);
 597                 wdev->conn = NULL;
 598
 599                 /*
 600                  * If this disconnect was due to a disassoc, we
 601                  * we might still have an auth BSS around. For
 602                  * the userspace SME that's currently expected,
 603                  * but for the kernel SME (nl80211 CONNECT or
 604                  * wireless extensions) we want to clear up all
 605                  * state.
 606                  */
 607                 for (i = 0; i < MAX_AUTH_BSSES; i++) {
 608                         if (!wdev->auth_bsses[i])
 609                                 continue;
 610                         bssid = wdev->auth_bsses[i]->pub.bssid;
 611                         ret = __cfg80211_mlme_deauth(rdev, dev, bssid, NULL, 0,
 612                                                 WLAN_REASON_DEAUTH_LEAVING);
 613                         WARN(ret, "deauth failed: %d\n", ret);
 614                 }
 615         }
 616
 617         nl80211_send_disconnected(rdev, dev, reason, ie, ie_len, from_ap);
 618
 619         /*
 620          * Delete all the keys ... pairwise keys can't really
 621          * exist any more anyway, but default keys might.
 622          */
 623         if (rdev->ops->del_key)
 624                 for (i = 0; i < 6; i++)
 625                         rdev->ops->del_key(wdev->wiphy, dev, i, NULL);
 626
 627 #ifdef CONFIG_WIRELESS_EXT
 628         memset(&wrqu, 0, sizeof(wrqu));
 629         wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 630         wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL);
 631 #endif
 632 }
 633
 634 void cfg80211_disconnected(struct net_device *dev, u16 reason,
 635                            u8 *ie, size_t ie_len, gfp_t gfp)
 636 {
 637         struct wireless_dev *wdev = dev->ieee80211_ptr;
 638         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 639         struct cfg80211_event *ev;
 640         unsigned long flags;
 641
 642         ev = kzalloc(sizeof(*ev) + ie_len, gfp);
 643         if (!ev)
 644                 return;
 645
 646         ev->type = EVENT_DISCONNECTED;
 647         ev->dc.ie = ((u8 *)ev) + sizeof(*ev);
 648         ev->dc.ie_len = ie_len;
 649         memcpy((void *)ev->dc.ie, ie, ie_len);
 650         ev->dc.reason = reason;
 651
 652         spin_lock_irqsave(&wdev->event_lock, flags);
 653         list_add_tail(&ev->list, &wdev->event_list);
 654         spin_unlock_irqrestore(&wdev->event_lock, flags);
 655         schedule_work(&rdev->event_work);
 656 }
 657 EXPORT_SYMBOL(cfg80211_disconnected);
 658
 659 int __cfg80211_connect(struct cfg80211_registered_device *rdev,
 660                        struct net_device *dev,
 661                        struct cfg80211_connect_params *connect,
 662                        struct cfg80211_cached_keys *connkeys,
 663                        const u8 *prev_bssid)
 664 {
 665         struct wireless_dev *wdev = dev->ieee80211_ptr;
 666         struct ieee80211_channel *chan;
 667         int err;
 668
 669         ASSERT_WDEV_LOCK(wdev);
 670
 671         if (wdev->sme_state != CFG80211_SME_IDLE)
 672                 return -EALREADY;
 673
 674         chan = rdev_fixed_channel(rdev, wdev);
 675         if (chan && chan != connect->channel)
 676                 return -EBUSY;
 677
 678         if (WARN_ON(wdev->connect_keys)) {
 679                 kfree(wdev->connect_keys);
 680                 wdev->connect_keys = NULL;
 681         }
 682
 683         if (connkeys && connkeys->def >= 0) {
 684                 int idx;
 685                 u32 cipher;
 686
 687                 idx = connkeys->def;
 688                 cipher = connkeys->params[idx].cipher;
 689                 /* If given a WEP key we may need it for shared key auth */
 690                 if (cipher == WLAN_CIPHER_SUITE_WEP40 ||
 691                     cipher == WLAN_CIPHER_SUITE_WEP104) {
 692                         connect->key_idx = idx;
 693                         connect->key = connkeys->params[idx].key;
 694                         connect->key_len = connkeys->params[idx].key_len;
 695
 696                         /*
 697                          * If ciphers are not set (e.g. when going through
 698                          * iwconfig), we have to set them appropriately here.
 699                          */
 700                         if (connect->crypto.cipher_group == 0)
 701                                 connect->crypto.cipher_group = cipher;
 702
 703                         if (connect->crypto.n_ciphers_pairwise == 0) {
 704                                 connect->crypto.n_ciphers_pairwise = 1;
 705                                 connect->crypto.ciphers_pairwise[0] = cipher;
 706                         }
 707                 }
 708         }
 709
 710         if (!rdev->ops->connect) {
 711                 if (!rdev->ops->auth || !rdev->ops->assoc)
 712                         return -EOPNOTSUPP;
 713
 714                 if (WARN_ON(wdev->conn))
 715                         return -EINPROGRESS;
 716
 717                 wdev->conn = kzalloc(sizeof(*wdev->conn), GFP_KERNEL);
 718                 if (!wdev->conn)
 719                         return -ENOMEM;
 720
 721                 /*
 722                  * Copy all parameters, and treat explicitly IEs, BSSID, SSID.
 723                  */
 724                 memcpy(&wdev->conn->params, connect, sizeof(*connect));
 725                 if (connect->bssid) {
 726                         wdev->conn->params.bssid = wdev->conn->bssid;
 727                         memcpy(wdev->conn->bssid, connect->bssid, ETH_ALEN);
 728                 }
 729
 730                 if (connect->ie) {
 731                         wdev->conn->ie = kmemdup(connect->ie, connect->ie_len,
 732                                                 GFP_KERNEL);
 733                         wdev->conn->params.ie = wdev->conn->ie;
 734                         if (!wdev->conn->ie) {
 735                                 kfree(wdev->conn);
 736                                 wdev->conn = NULL;
 737                                 return -ENOMEM;
 738                         }
 739                 }
 740
 741                 if (connect->auth_type == NL80211_AUTHTYPE_AUTOMATIC) {
 742                         wdev->conn->auto_auth = true;
 743                         /* start with open system ... should mostly work */
 744                         wdev->conn->params.auth_type =
 745                                 NL80211_AUTHTYPE_OPEN_SYSTEM;
 746                 } else {
 747                         wdev->conn->auto_auth = false;
 748                 }
 749
 750                 memcpy(wdev->ssid, connect->ssid, connect->ssid_len);
 751                 wdev->ssid_len = connect->ssid_len;
 752                 wdev->conn->params.ssid = wdev->ssid;
 753                 wdev->conn->params.ssid_len = connect->ssid_len;
 754
 755                 /* don't care about result -- but fill bssid & channel */
 756                 if (!wdev->conn->params.bssid || !wdev->conn->params.channel)
 757                         cfg80211_get_conn_bss(wdev);
 758
 759                 wdev->sme_state = CFG80211_SME_CONNECTING;
 760                 wdev->connect_keys = connkeys;
 761
 762                 if (prev_bssid) {
 763                         memcpy(wdev->conn->prev_bssid, prev_bssid, ETH_ALEN);
 764                         wdev->conn->prev_bssid_valid = true;
 765                 }
 766
 767                 /* we're good if we have both BSSID and channel */
 768                 if (wdev->conn->params.bssid && wdev->conn->params.channel) {
 769                         wdev->conn->state = CFG80211_CONN_AUTHENTICATE_NEXT;
 770                         err = cfg80211_conn_do_work(wdev);
 771                 } else {
 772                         /* otherwise we'll need to scan for the AP first */
 773                         err = cfg80211_conn_scan(wdev);
 774                         /*
 775                          * If we can't scan right now, then we need to scan again
 776                          * after the current scan finished, since the parameters
 777                          * changed (unless we find a good AP anyway).
 778                          */
 779                         if (err == -EBUSY) {
 780                                 err = 0;
 781                                 wdev->conn->state = CFG80211_CONN_SCAN_AGAIN;
 782                         }
 783                 }
 784                 if (err) {
 785                         kfree(wdev->conn->ie);
 786                         kfree(wdev->conn);
 787                         wdev->conn = NULL;
 788                         wdev->sme_state = CFG80211_SME_IDLE;
 789                         wdev->connect_keys = NULL;
 790                         wdev->ssid_len = 0;
 791                 }
 792
 793                 return err;
 794         } else {
 795                 wdev->sme_state = CFG80211_SME_CONNECTING;
 796                 wdev->connect_keys = connkeys;
 797                 err = rdev->ops->connect(&rdev->wiphy, dev, connect);
 798                 if (err) {
 799                         wdev->connect_keys = NULL;
 800                         wdev->sme_state = CFG80211_SME_IDLE;
 801                         return err;
 802                 }
 803
 804                 memcpy(wdev->ssid, connect->ssid, connect->ssid_len);
 805                 wdev->ssid_len = connect->ssid_len;
 806
 807                 return 0;
 808         }
 809 }
 810
 811 int cfg80211_connect(struct cfg80211_registered_device *rdev,
 812                      struct net_device *dev,
 813                      struct cfg80211_connect_params *connect,
 814                      struct cfg80211_cached_keys *connkeys)
 815 {
 816         int err;
 817
 818         mutex_lock(&rdev->devlist_mtx);
 819         wdev_lock(dev->ieee80211_ptr);
 820         err = __cfg80211_connect(rdev, dev, connect, connkeys, NULL);
 821         wdev_unlock(dev->ieee80211_ptr);
 822         mutex_unlock(&rdev->devlist_mtx);
 823
 824         return err;
 825 }
 826
 827 int __cfg80211_disconnect(struct cfg80211_registered_device *rdev,
 828                           struct net_device *dev, u16 reason, bool wextev)
 829 {
 830         struct wireless_dev *wdev = dev->ieee80211_ptr;
 831         int err;
 832
 833         ASSERT_WDEV_LOCK(wdev);
 834
 835         if (wdev->sme_state == CFG80211_SME_IDLE)
 836                 return -EINVAL;
 837
 838         kfree(wdev->connect_keys);
 839         wdev->connect_keys = NULL;
 840
 841         if (!rdev->ops->disconnect) {
 842                 if (!rdev->ops->deauth)
 843                         return -EOPNOTSUPP;
 844
 845                 /* was it connected by userspace SME? */
 846                 if (!wdev->conn) {
 847                         cfg80211_mlme_down(rdev, dev);
 848                         return 0;
 849                 }
 850
 851                 if (wdev->sme_state == CFG80211_SME_CONNECTING &&
 852                     (wdev->conn->state == CFG80211_CONN_SCANNING ||
 853                      wdev->conn->state == CFG80211_CONN_SCAN_AGAIN)) {
 854                         wdev->sme_state = CFG80211_SME_IDLE;
 855                         kfree(wdev->conn->ie);
 856                         kfree(wdev->conn);
 857                         wdev->conn = NULL;
 858                         wdev->ssid_len = 0;
 859                         return 0;
 860                 }
 861
 862                 /* wdev->conn->params.bssid must be set if > SCANNING */
 863                 err = __cfg80211_mlme_deauth(rdev, dev,
 864                                              wdev->conn->params.bssid,
 865                                              NULL, 0, reason);
 866                 if (err)
 867                         return err;
 868         } else {
 869                 err = rdev->ops->disconnect(&rdev->wiphy, dev, reason);
 870                 if (err)
 871                         return err;
 872         }
 873
 874         if (wdev->sme_state == CFG80211_SME_CONNECTED)
 875                 __cfg80211_disconnected(dev, NULL, 0, 0, false);
 876         else if (wdev->sme_state == CFG80211_SME_CONNECTING)
 877                 __cfg80211_connect_result(dev, NULL, NULL, 0, NULL, 0,
 878                                           WLAN_STATUS_UNSPECIFIED_FAILURE,
 879                                           wextev, NULL);
 880
 881         return 0;
 882 }
 883
 884 int cfg80211_disconnect(struct cfg80211_registered_device *rdev,
 885                         struct net_device *dev,
 886                         u16 reason, bool wextev)
 887 {
 888         int err;
 889
 890         wdev_lock(dev->ieee80211_ptr);
 891         err = __cfg80211_disconnect(rdev, dev, reason, wextev);
 892         wdev_unlock(dev->ieee80211_ptr);
 893
 894         return err;
 895 }
 896
 897 void cfg80211_sme_disassoc(struct net_device *dev, int idx)
 898 {
 899         struct wireless_dev *wdev = dev->ieee80211_ptr;
 900         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 901         u8 bssid[ETH_ALEN];
 902
 903         ASSERT_WDEV_LOCK(wdev);
 904
 905         if (!wdev->conn)
 906                 return;
 907
 908         if (wdev->conn->state == CFG80211_CONN_IDLE)
 909                 return;
 910
 911         /*
 912          * Ok, so the association was made by this SME -- we don't
 913          * want it any more so deauthenticate too.
 914          */
 915
 916         if (!wdev->auth_bsses[idx])
 917                 return;
 918
 919         memcpy(bssid, wdev->auth_bsses[idx]->pub.bssid, ETH_ALEN);
 920         if (__cfg80211_mlme_deauth(rdev, dev, bssid,
 921                                    NULL, 0, WLAN_REASON_DEAUTH_LEAVING)) {
 922                 /* whatever -- assume gone anyway */
 923                 cfg80211_unhold_bss(wdev->auth_bsses[idx]);
 924                 cfg80211_put_bss(&wdev->auth_bsses[idx]->pub);
 925                 wdev->auth_bsses[idx] = NULL;
 926         }
 927 }