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         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         const u8 *prev_bssid = NULL;
 114         int err;
 115
 116         ASSERT_WDEV_LOCK(wdev);
 117
 118         if (!wdev->conn)
 119                 return 0;
 120
 121         params = &wdev->conn->params;
 122
 123         switch (wdev->conn->state) {
 124         case CFG80211_CONN_SCAN_AGAIN:
 125                 return cfg80211_conn_scan(wdev);
 126         case CFG80211_CONN_AUTHENTICATE_NEXT:
 127                 BUG_ON(!rdev->ops->auth);
 128                 wdev->conn->state = CFG80211_CONN_AUTHENTICATING;
 129                 return __cfg80211_mlme_auth(rdev, wdev->netdev,
 130                                             params->channel, params->auth_type,
 131                                             params->bssid,
 132                                             params->ssid, params->ssid_len,
 133                                             NULL, 0,
 134                                             params->key, params->key_len,
 135                                             params->key_idx);
 136         case CFG80211_CONN_ASSOCIATE_NEXT:
 137                 BUG_ON(!rdev->ops->assoc);
 138                 wdev->conn->state = CFG80211_CONN_ASSOCIATING;
 139                 if (wdev->conn->prev_bssid_valid)
 140                         prev_bssid = wdev->conn->prev_bssid;
 141                 err = __cfg80211_mlme_assoc(rdev, wdev->netdev,
 142                                             params->channel, params->bssid,
 143                                             prev_bssid,
 144                                             params->ssid, params->ssid_len,
 145                                             params->ie, params->ie_len,
 146                                             false, &params->crypto);
 147                 if (err)
 148                         __cfg80211_mlme_deauth(rdev, wdev->netdev, params->bssid,
 149                                                NULL, 0,
 150                                                WLAN_REASON_DEAUTH_LEAVING);
 151                 return err;
 152         default:
 153                 return 0;
 154         }
 155 }
 156
 157 void cfg80211_conn_work(struct work_struct *work)
 158 {
 159         struct cfg80211_registered_device *rdev =
 160                 container_of(work, struct cfg80211_registered_device, conn_work);
 161         struct wireless_dev *wdev;
 162
 163         rtnl_lock();
 164         cfg80211_lock_rdev(rdev);
 165         mutex_lock(&rdev->devlist_mtx);
 166
 167         list_for_each_entry(wdev, &rdev->netdev_list, list) {
 168                 wdev_lock(wdev);
 169                 if (!netif_running(wdev->netdev)) {
 170                         wdev_unlock(wdev);
 171                         continue;
 172                 }
 173                 if (wdev->sme_state != CFG80211_SME_CONNECTING) {
 174                         wdev_unlock(wdev);
 175                         continue;
 176                 }
 177                 if (cfg80211_conn_do_work(wdev))
 178                         __cfg80211_connect_result(
 179                                         wdev->netdev,
 180                                         wdev->conn->params.bssid,
 181                                         NULL, 0, NULL, 0,
 182                                         WLAN_STATUS_UNSPECIFIED_FAILURE,
 183                                         false, NULL);
 184                 wdev_unlock(wdev);
 185         }
 186
 187         mutex_unlock(&rdev->devlist_mtx);
 188         cfg80211_unlock_rdev(rdev);
 189         rtnl_unlock();
 190 }
 191
 192 static bool cfg80211_get_conn_bss(struct wireless_dev *wdev)
 193 {
 194         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 195         struct cfg80211_bss *bss;
 196         u16 capa = WLAN_CAPABILITY_ESS;
 197
 198         ASSERT_WDEV_LOCK(wdev);
 199
 200         if (wdev->conn->params.privacy)
 201                 capa |= WLAN_CAPABILITY_PRIVACY;
 202
 203         bss = cfg80211_get_bss(wdev->wiphy, NULL, wdev->conn->params.bssid,
 204                                wdev->conn->params.ssid,
 205                                wdev->conn->params.ssid_len,
 206                                WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_PRIVACY,
 207                                capa);
 208         if (!bss)
 209                 return false;
 210
 211         memcpy(wdev->conn->bssid, bss->bssid, ETH_ALEN);
 212         wdev->conn->params.bssid = wdev->conn->bssid;
 213         wdev->conn->params.channel = bss->channel;
 214         wdev->conn->state = CFG80211_CONN_AUTHENTICATE_NEXT;
 215         schedule_work(&rdev->conn_work);
 216
 217         cfg80211_put_bss(bss);
 218         return true;
 219 }
 220
 221 static void __cfg80211_sme_scan_done(struct net_device *dev)
 222 {
 223         struct wireless_dev *wdev = dev->ieee80211_ptr;
 224         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 225
 226         ASSERT_WDEV_LOCK(wdev);
 227
 228         if (wdev->sme_state != CFG80211_SME_CONNECTING)
 229                 return;
 230
 231         if (!wdev->conn)
 232                 return;
 233
 234         if (wdev->conn->state != CFG80211_CONN_SCANNING &&
 235             wdev->conn->state != CFG80211_CONN_SCAN_AGAIN)
 236                 return;
 237
 238         if (!cfg80211_get_conn_bss(wdev)) {
 239                 /* not found */
 240                 if (wdev->conn->state == CFG80211_CONN_SCAN_AGAIN)
 241                         schedule_work(&rdev->conn_work);
 242                 else
 243                         __cfg80211_connect_result(
 244                                         wdev->netdev,
 245                                         wdev->conn->params.bssid,
 246                                         NULL, 0, NULL, 0,
 247                                         WLAN_STATUS_UNSPECIFIED_FAILURE,
 248                                         false, NULL);
 249         }
 250 }
 251
 252 void cfg80211_sme_scan_done(struct net_device *dev)
 253 {
 254         struct wireless_dev *wdev = dev->ieee80211_ptr;
 255
 256         mutex_lock(&wiphy_to_dev(wdev->wiphy)->devlist_mtx);
 257         wdev_lock(wdev);
 258         __cfg80211_sme_scan_done(dev);
 259         wdev_unlock(wdev);
 260         mutex_unlock(&wiphy_to_dev(wdev->wiphy)->devlist_mtx);
 261 }
 262
 263 void cfg80211_sme_rx_auth(struct net_device *dev,
 264                           const u8 *buf, size_t len)
 265 {
 266         struct wireless_dev *wdev = dev->ieee80211_ptr;
 267         struct wiphy *wiphy = wdev->wiphy;
 268         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 269         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)buf;
 270         u16 status_code = le16_to_cpu(mgmt->u.auth.status_code);
 271
 272         ASSERT_WDEV_LOCK(wdev);
 273
 274         /* should only RX auth frames when connecting */
 275         if (wdev->sme_state != CFG80211_SME_CONNECTING)
 276                 return;
 277
 278         if (WARN_ON(!wdev->conn))
 279                 return;
 280
 281         if (status_code == WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG &&
 282             wdev->conn->auto_auth &&
 283             wdev->conn->params.auth_type != NL80211_AUTHTYPE_NETWORK_EAP) {
 284                 /* select automatically between only open, shared, leap */
 285                 switch (wdev->conn->params.auth_type) {
 286                 case NL80211_AUTHTYPE_OPEN_SYSTEM:
 287                         if (wdev->connect_keys)
 288                                 wdev->conn->params.auth_type =
 289                                         NL80211_AUTHTYPE_SHARED_KEY;
 290                         else
 291                                 wdev->conn->params.auth_type =
 292                                         NL80211_AUTHTYPE_NETWORK_EAP;
 293                         break;
 294                 case NL80211_AUTHTYPE_SHARED_KEY:
 295                         wdev->conn->params.auth_type =
 296                                 NL80211_AUTHTYPE_NETWORK_EAP;
 297                         break;
 298                 default:
 299                         /* huh? */
 300                         wdev->conn->params.auth_type =
 301                                 NL80211_AUTHTYPE_OPEN_SYSTEM;
 302                         break;
 303                 }
 304                 wdev->conn->state = CFG80211_CONN_AUTHENTICATE_NEXT;
 305                 schedule_work(&rdev->conn_work);
 306         } else if (status_code != WLAN_STATUS_SUCCESS) {
 307                 __cfg80211_connect_result(dev, mgmt->bssid, NULL, 0, NULL, 0,
 308                                           status_code, false, NULL);
 309         } else if (wdev->sme_state == CFG80211_SME_CONNECTING &&
 310                  wdev->conn->state == CFG80211_CONN_AUTHENTICATING) {
 311                 wdev->conn->state = CFG80211_CONN_ASSOCIATE_NEXT;
 312                 schedule_work(&rdev->conn_work);
 313         }
 314 }
 315
 316 bool cfg80211_sme_failed_reassoc(struct wireless_dev *wdev)
 317 {
 318         struct wiphy *wiphy = wdev->wiphy;
 319         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 320
 321         if (WARN_ON(!wdev->conn))
 322                 return false;
 323
 324         if (!wdev->conn->prev_bssid_valid)
 325                 return false;
 326
 327         /*
 328          * Some stupid APs don't accept reassoc, so we
 329          * need to fall back to trying regular assoc.
 330          */
 331         wdev->conn->prev_bssid_valid = false;
 332         wdev->conn->state = CFG80211_CONN_ASSOCIATE_NEXT;
 333         schedule_work(&rdev->conn_work);
 334
 335         return true;
 336 }
 337
 338 void __cfg80211_connect_result(struct net_device *dev, const u8 *bssid,
 339                                const u8 *req_ie, size_t req_ie_len,
 340                                const u8 *resp_ie, size_t resp_ie_len,
 341                                u16 status, bool wextev,
 342                                struct cfg80211_bss *bss)
 343 {
 344         struct wireless_dev *wdev = dev->ieee80211_ptr;
 345         u8 *country_ie;
 346 #ifdef CONFIG_WIRELESS_EXT
 347         union iwreq_data wrqu;
 348 #endif
 349
 350         ASSERT_WDEV_LOCK(wdev);
 351
 352         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
 353                 return;
 354
 355         if (wdev->sme_state == CFG80211_SME_CONNECTED)
 356                 nl80211_send_roamed(wiphy_to_dev(wdev->wiphy), dev,
 357                                     bssid, req_ie, req_ie_len,
 358                                     resp_ie, resp_ie_len, GFP_KERNEL);
 359         else
 360                 nl80211_send_connect_result(wiphy_to_dev(wdev->wiphy), dev,
 361                                             bssid, req_ie, req_ie_len,
 362                                             resp_ie, resp_ie_len,
 363                                             status, GFP_KERNEL);
 364
 365 #ifdef CONFIG_WIRELESS_EXT
 366         if (wextev) {
 367                 if (req_ie && status == WLAN_STATUS_SUCCESS) {
 368                         memset(&wrqu, 0, sizeof(wrqu));
 369                         wrqu.data.length = req_ie_len;
 370                         wireless_send_event(dev, IWEVASSOCREQIE, &wrqu, req_ie);
 371                 }
 372
 373                 if (resp_ie && status == WLAN_STATUS_SUCCESS) {
 374                         memset(&wrqu, 0, sizeof(wrqu));
 375                         wrqu.data.length = resp_ie_len;
 376                         wireless_send_event(dev, IWEVASSOCRESPIE, &wrqu, resp_ie);
 377                 }
 378
 379                 memset(&wrqu, 0, sizeof(wrqu));
 380                 wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 381                 if (bssid && status == WLAN_STATUS_SUCCESS) {
 382                         memcpy(wrqu.ap_addr.sa_data, bssid, ETH_ALEN);
 383                         memcpy(wdev->wext.prev_bssid, bssid, ETH_ALEN);
 384                         wdev->wext.prev_bssid_valid = true;
 385                 }
 386                 wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL);
 387         }
 388 #endif
 389
 390         if (wdev->current_bss) {
 391                 cfg80211_unhold_bss(wdev->current_bss);
 392                 cfg80211_put_bss(&wdev->current_bss->pub);
 393                 wdev->current_bss = NULL;
 394         }
 395
 396         if (status == WLAN_STATUS_SUCCESS &&
 397             wdev->sme_state == CFG80211_SME_IDLE)
 398                 goto success;
 399
 400         if (wdev->sme_state != CFG80211_SME_CONNECTING)
 401                 return;
 402
 403         if (wdev->conn)
 404                 wdev->conn->state = CFG80211_CONN_IDLE;
 405
 406         if (status != WLAN_STATUS_SUCCESS) {
 407                 wdev->sme_state = CFG80211_SME_IDLE;
 408                 kfree(wdev->conn);
 409                 wdev->conn = NULL;
 410                 kfree(wdev->connect_keys);
 411                 wdev->connect_keys = NULL;
 412                 wdev->ssid_len = 0;
 413                 return;
 414         }
 415
 416  success:
 417         if (!bss)
 418                 bss = cfg80211_get_bss(wdev->wiphy, NULL, bssid,
 419                                        wdev->ssid, wdev->ssid_len,
 420                                        WLAN_CAPABILITY_ESS,
 421                                        WLAN_CAPABILITY_ESS);
 422
 423         if (WARN_ON(!bss))
 424                 return;
 425
 426         cfg80211_hold_bss(bss_from_pub(bss));
 427         wdev->current_bss = bss_from_pub(bss);
 428
 429         wdev->sme_state = CFG80211_SME_CONNECTED;
 430         cfg80211_upload_connect_keys(wdev);
 431
 432         country_ie = (u8 *) ieee80211_bss_get_ie(bss, WLAN_EID_COUNTRY);
 433
 434         if (!country_ie)
 435                 return;
 436
 437         /*
 438          * ieee80211_bss_get_ie() ensures we can access:
 439          * - country_ie + 2, the start of the country ie data, and
 440          * - and country_ie[1] which is the IE length
 441          */
 442         regulatory_hint_11d(wdev->wiphy,
 443                             country_ie + 2,
 444                             country_ie[1]);
 445 }
 446
 447 void cfg80211_connect_result(struct net_device *dev, const u8 *bssid,
 448                              const u8 *req_ie, size_t req_ie_len,
 449                              const u8 *resp_ie, size_t resp_ie_len,
 450                              u16 status, gfp_t gfp)
 451 {
 452         struct wireless_dev *wdev = dev->ieee80211_ptr;
 453         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 454         struct cfg80211_event *ev;
 455         unsigned long flags;
 456
 457         ev = kzalloc(sizeof(*ev) + req_ie_len + resp_ie_len, gfp);
 458         if (!ev)
 459                 return;
 460
 461         ev->type = EVENT_CONNECT_RESULT;
 462         memcpy(ev->cr.bssid, bssid, ETH_ALEN);
 463         ev->cr.req_ie = ((u8 *)ev) + sizeof(*ev);
 464         ev->cr.req_ie_len = req_ie_len;
 465         memcpy((void *)ev->cr.req_ie, req_ie, req_ie_len);
 466         ev->cr.resp_ie = ((u8 *)ev) + sizeof(*ev) + req_ie_len;
 467         ev->cr.resp_ie_len = resp_ie_len;
 468         memcpy((void *)ev->cr.resp_ie, resp_ie, resp_ie_len);
 469         ev->cr.status = status;
 470
 471         spin_lock_irqsave(&wdev->event_lock, flags);
 472         list_add_tail(&ev->list, &wdev->event_list);
 473         spin_unlock_irqrestore(&wdev->event_lock, flags);
 474         schedule_work(&rdev->event_work);
 475 }
 476 EXPORT_SYMBOL(cfg80211_connect_result);
 477
 478 void __cfg80211_roamed(struct wireless_dev *wdev, const u8 *bssid,
 479                        const u8 *req_ie, size_t req_ie_len,
 480                        const u8 *resp_ie, size_t resp_ie_len)
 481 {
 482         struct cfg80211_bss *bss;
 483 #ifdef CONFIG_WIRELESS_EXT
 484         union iwreq_data wrqu;
 485 #endif
 486
 487         ASSERT_WDEV_LOCK(wdev);
 488
 489         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
 490                 return;
 491
 492         if (WARN_ON(wdev->sme_state != CFG80211_SME_CONNECTED))
 493                 return;
 494
 495         /* internal error -- how did we get to CONNECTED w/o BSS? */
 496         if (WARN_ON(!wdev->current_bss)) {
 497                 return;
 498         }
 499
 500         cfg80211_unhold_bss(wdev->current_bss);
 501         cfg80211_put_bss(&wdev->current_bss->pub);
 502         wdev->current_bss = NULL;
 503
 504         bss = cfg80211_get_bss(wdev->wiphy, NULL, bssid,
 505                                wdev->ssid, wdev->ssid_len,
 506                                WLAN_CAPABILITY_ESS, WLAN_CAPABILITY_ESS);
 507
 508         if (WARN_ON(!bss))
 509                 return;
 510
 511         cfg80211_hold_bss(bss_from_pub(bss));
 512         wdev->current_bss = bss_from_pub(bss);
 513
 514         nl80211_send_roamed(wiphy_to_dev(wdev->wiphy), wdev->netdev, bssid,
 515                             req_ie, req_ie_len, resp_ie, resp_ie_len,
 516                             GFP_KERNEL);
 517
 518 #ifdef CONFIG_WIRELESS_EXT
 519         if (req_ie) {
 520                 memset(&wrqu, 0, sizeof(wrqu));
 521                 wrqu.data.length = req_ie_len;
 522                 wireless_send_event(wdev->netdev, IWEVASSOCREQIE,
 523                                     &wrqu, req_ie);
 524         }
 525
 526         if (resp_ie) {
 527                 memset(&wrqu, 0, sizeof(wrqu));
 528                 wrqu.data.length = resp_ie_len;
 529                 wireless_send_event(wdev->netdev, IWEVASSOCRESPIE,
 530                                     &wrqu, resp_ie);
 531         }
 532
 533         memset(&wrqu, 0, sizeof(wrqu));
 534         wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 535         memcpy(wrqu.ap_addr.sa_data, bssid, ETH_ALEN);
 536         memcpy(wdev->wext.prev_bssid, bssid, ETH_ALEN);
 537         wdev->wext.prev_bssid_valid = true;
 538         wireless_send_event(wdev->netdev, SIOCGIWAP, &wrqu, NULL);
 539 #endif
 540 }
 541
 542 void cfg80211_roamed(struct net_device *dev, const u8 *bssid,
 543                      const u8 *req_ie, size_t req_ie_len,
 544                      const u8 *resp_ie, size_t resp_ie_len, gfp_t gfp)
 545 {
 546         struct wireless_dev *wdev = dev->ieee80211_ptr;
 547         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 548         struct cfg80211_event *ev;
 549         unsigned long flags;
 550
 551         ev = kzalloc(sizeof(*ev) + req_ie_len + resp_ie_len, gfp);
 552         if (!ev)
 553                 return;
 554
 555         ev->type = EVENT_ROAMED;
 556         memcpy(ev->rm.bssid, bssid, ETH_ALEN);
 557         ev->rm.req_ie = ((u8 *)ev) + sizeof(*ev);
 558         ev->rm.req_ie_len = req_ie_len;
 559         memcpy((void *)ev->rm.req_ie, req_ie, req_ie_len);
 560         ev->rm.resp_ie = ((u8 *)ev) + sizeof(*ev) + req_ie_len;
 561         ev->rm.resp_ie_len = resp_ie_len;
 562         memcpy((void *)ev->rm.resp_ie, resp_ie, resp_ie_len);
 563
 564         spin_lock_irqsave(&wdev->event_lock, flags);
 565         list_add_tail(&ev->list, &wdev->event_list);
 566         spin_unlock_irqrestore(&wdev->event_lock, flags);
 567         schedule_work(&rdev->event_work);
 568 }
 569 EXPORT_SYMBOL(cfg80211_roamed);
 570
 571 void __cfg80211_disconnected(struct net_device *dev, const u8 *ie,
 572                              size_t ie_len, u16 reason, bool from_ap)
 573 {
 574         struct wireless_dev *wdev = dev->ieee80211_ptr;
 575         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 576         int i;
 577 #ifdef CONFIG_WIRELESS_EXT
 578         union iwreq_data wrqu;
 579 #endif
 580
 581         ASSERT_WDEV_LOCK(wdev);
 582
 583         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
 584                 return;
 585
 586         if (WARN_ON(wdev->sme_state != CFG80211_SME_CONNECTED))
 587                 return;
 588
 589         if (wdev->current_bss) {
 590                 cfg80211_unhold_bss(wdev->current_bss);
 591                 cfg80211_put_bss(&wdev->current_bss->pub);
 592         }
 593
 594         wdev->current_bss = NULL;
 595         wdev->sme_state = CFG80211_SME_IDLE;
 596         wdev->ssid_len = 0;
 597
 598         if (wdev->conn) {
 599                 const u8 *bssid;
 600                 int ret;
 601
 602                 kfree(wdev->conn->ie);
 603                 wdev->conn->ie = NULL;
 604                 kfree(wdev->conn);
 605                 wdev->conn = NULL;
 606
 607                 /*
 608                  * If this disconnect was due to a disassoc, we
 609                  * we might still have an auth BSS around. For
 610                  * the userspace SME that's currently expected,
 611                  * but for the kernel SME (nl80211 CONNECT or
 612                  * wireless extensions) we want to clear up all
 613                  * state.
 614                  */
 615                 for (i = 0; i < MAX_AUTH_BSSES; i++) {
 616                         if (!wdev->auth_bsses[i])
 617                                 continue;
 618                         bssid = wdev->auth_bsses[i]->pub.bssid;
 619                         ret = __cfg80211_mlme_deauth(rdev, dev, bssid, NULL, 0,
 620                                                 WLAN_REASON_DEAUTH_LEAVING);
 621                         WARN(ret, "deauth failed: %d\n", ret);
 622                 }
 623         }
 624
 625         nl80211_send_disconnected(rdev, dev, reason, ie, ie_len, from_ap);
 626
 627         /*
 628          * Delete all the keys ... pairwise keys can't really
 629          * exist any more anyway, but default keys might.
 630          */
 631         if (rdev->ops->del_key)
 632                 for (i = 0; i < 6; i++)
 633                         rdev->ops->del_key(wdev->wiphy, dev, i, NULL);
 634
 635 #ifdef CONFIG_WIRELESS_EXT
 636         memset(&wrqu, 0, sizeof(wrqu));
 637         wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 638         wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL);
 639 #endif
 640 }
 641
 642 void cfg80211_disconnected(struct net_device *dev, u16 reason,
 643                            u8 *ie, size_t ie_len, gfp_t gfp)
 644 {
 645         struct wireless_dev *wdev = dev->ieee80211_ptr;
 646         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 647         struct cfg80211_event *ev;
 648         unsigned long flags;
 649
 650         ev = kzalloc(sizeof(*ev) + ie_len, gfp);
 651         if (!ev)
 652                 return;
 653
 654         ev->type = EVENT_DISCONNECTED;
 655         ev->dc.ie = ((u8 *)ev) + sizeof(*ev);
 656         ev->dc.ie_len = ie_len;
 657         memcpy((void *)ev->dc.ie, ie, ie_len);
 658         ev->dc.reason = reason;
 659
 660         spin_lock_irqsave(&wdev->event_lock, flags);
 661         list_add_tail(&ev->list, &wdev->event_list);
 662         spin_unlock_irqrestore(&wdev->event_lock, flags);
 663         schedule_work(&rdev->event_work);
 664 }
 665 EXPORT_SYMBOL(cfg80211_disconnected);
 666
 667 int __cfg80211_connect(struct cfg80211_registered_device *rdev,
 668                        struct net_device *dev,
 669                        struct cfg80211_connect_params *connect,
 670                        struct cfg80211_cached_keys *connkeys,
 671                        const u8 *prev_bssid)
 672 {
 673         struct wireless_dev *wdev = dev->ieee80211_ptr;
 674         struct ieee80211_channel *chan;
 675         int err;
 676
 677         ASSERT_WDEV_LOCK(wdev);
 678
 679         if (wdev->sme_state != CFG80211_SME_IDLE)
 680                 return -EALREADY;
 681
 682         chan = rdev_fixed_channel(rdev, wdev);
 683         if (chan && chan != connect->channel)
 684                 return -EBUSY;
 685
 686         if (WARN_ON(wdev->connect_keys)) {
 687                 kfree(wdev->connect_keys);
 688                 wdev->connect_keys = NULL;
 689         }
 690
 691         if (connkeys && connkeys->def >= 0) {
 692                 int idx;
 693                 u32 cipher;
 694
 695                 idx = connkeys->def;
 696                 cipher = connkeys->params[idx].cipher;
 697                 /* If given a WEP key we may need it for shared key auth */
 698                 if (cipher == WLAN_CIPHER_SUITE_WEP40 ||
 699                     cipher == WLAN_CIPHER_SUITE_WEP104) {
 700                         connect->key_idx = idx;
 701                         connect->key = connkeys->params[idx].key;
 702                         connect->key_len = connkeys->params[idx].key_len;
 703
 704                         /*
 705                          * If ciphers are not set (e.g. when going through
 706                          * iwconfig), we have to set them appropriately here.
 707                          */
 708                         if (connect->crypto.cipher_group == 0)
 709                                 connect->crypto.cipher_group = cipher;
 710
 711                         if (connect->crypto.n_ciphers_pairwise == 0) {
 712                                 connect->crypto.n_ciphers_pairwise = 1;
 713                                 connect->crypto.ciphers_pairwise[0] = cipher;
 714                         }
 715                 }
 716         }
 717
 718         if (!rdev->ops->connect) {
 719                 if (!rdev->ops->auth || !rdev->ops->assoc)
 720                         return -EOPNOTSUPP;
 721
 722                 if (WARN_ON(wdev->conn))
 723                         return -EINPROGRESS;
 724
 725                 wdev->conn = kzalloc(sizeof(*wdev->conn), GFP_KERNEL);
 726                 if (!wdev->conn)
 727                         return -ENOMEM;
 728
 729                 /*
 730                  * Copy all parameters, and treat explicitly IEs, BSSID, SSID.
 731                  */
 732                 memcpy(&wdev->conn->params, connect, sizeof(*connect));
 733                 if (connect->bssid) {
 734                         wdev->conn->params.bssid = wdev->conn->bssid;
 735                         memcpy(wdev->conn->bssid, connect->bssid, ETH_ALEN);
 736                 }
 737
 738                 if (connect->ie) {
 739                         wdev->conn->ie = kmemdup(connect->ie, connect->ie_len,
 740                                                 GFP_KERNEL);
 741                         wdev->conn->params.ie = wdev->conn->ie;
 742                         if (!wdev->conn->ie) {
 743                                 kfree(wdev->conn);
 744                                 wdev->conn = NULL;
 745                                 return -ENOMEM;
 746                         }
 747                 }
 748
 749                 if (connect->auth_type == NL80211_AUTHTYPE_AUTOMATIC) {
 750                         wdev->conn->auto_auth = true;
 751                         /* start with open system ... should mostly work */
 752                         wdev->conn->params.auth_type =
 753                                 NL80211_AUTHTYPE_OPEN_SYSTEM;
 754                 } else {
 755                         wdev->conn->auto_auth = false;
 756                 }
 757
 758                 memcpy(wdev->ssid, connect->ssid, connect->ssid_len);
 759                 wdev->ssid_len = connect->ssid_len;
 760                 wdev->conn->params.ssid = wdev->ssid;
 761                 wdev->conn->params.ssid_len = connect->ssid_len;
 762
 763                 /* don't care about result -- but fill bssid & channel */
 764                 if (!wdev->conn->params.bssid || !wdev->conn->params.channel)
 765                         cfg80211_get_conn_bss(wdev);
 766
 767                 wdev->sme_state = CFG80211_SME_CONNECTING;
 768                 wdev->connect_keys = connkeys;
 769
 770                 if (prev_bssid) {
 771                         memcpy(wdev->conn->prev_bssid, prev_bssid, ETH_ALEN);
 772                         wdev->conn->prev_bssid_valid = true;
 773                 }
 774
 775                 /* we're good if we have both BSSID and channel */
 776                 if (wdev->conn->params.bssid && wdev->conn->params.channel) {
 777                         wdev->conn->state = CFG80211_CONN_AUTHENTICATE_NEXT;
 778                         err = cfg80211_conn_do_work(wdev);
 779                 } else {
 780                         /* otherwise we'll need to scan for the AP first */
 781                         err = cfg80211_conn_scan(wdev);
 782                         /*
 783                          * If we can't scan right now, then we need to scan again
 784                          * after the current scan finished, since the parameters
 785                          * changed (unless we find a good AP anyway).
 786                          */
 787                         if (err == -EBUSY) {
 788                                 err = 0;
 789                                 wdev->conn->state = CFG80211_CONN_SCAN_AGAIN;
 790                         }
 791                 }
 792                 if (err) {
 793                         kfree(wdev->conn);
 794                         wdev->conn = NULL;
 795                         wdev->sme_state = CFG80211_SME_IDLE;
 796                         wdev->connect_keys = NULL;
 797                         wdev->ssid_len = 0;
 798                 }
 799
 800                 return err;
 801         } else {
 802                 wdev->sme_state = CFG80211_SME_CONNECTING;
 803                 wdev->connect_keys = connkeys;
 804                 err = rdev->ops->connect(&rdev->wiphy, dev, connect);
 805                 if (err) {
 806                         wdev->connect_keys = NULL;
 807                         wdev->sme_state = CFG80211_SME_IDLE;
 808                         return err;
 809                 }
 810
 811                 memcpy(wdev->ssid, connect->ssid, connect->ssid_len);
 812                 wdev->ssid_len = connect->ssid_len;
 813
 814                 return 0;
 815         }
 816 }
 817
 818 int cfg80211_connect(struct cfg80211_registered_device *rdev,
 819                      struct net_device *dev,
 820                      struct cfg80211_connect_params *connect,
 821                      struct cfg80211_cached_keys *connkeys)
 822 {
 823         int err;
 824
 825         mutex_lock(&rdev->devlist_mtx);
 826         wdev_lock(dev->ieee80211_ptr);
 827         err = __cfg80211_connect(rdev, dev, connect, connkeys, NULL);
 828         wdev_unlock(dev->ieee80211_ptr);
 829         mutex_unlock(&rdev->devlist_mtx);
 830
 831         return err;
 832 }
 833
 834 int __cfg80211_disconnect(struct cfg80211_registered_device *rdev,
 835                           struct net_device *dev, u16 reason, bool wextev)
 836 {
 837         struct wireless_dev *wdev = dev->ieee80211_ptr;
 838         int err;
 839
 840         ASSERT_WDEV_LOCK(wdev);
 841
 842         if (wdev->sme_state == CFG80211_SME_IDLE)
 843                 return -EINVAL;
 844
 845         kfree(wdev->connect_keys);
 846         wdev->connect_keys = NULL;
 847
 848         if (!rdev->ops->disconnect) {
 849                 if (!rdev->ops->deauth)
 850                         return -EOPNOTSUPP;
 851
 852                 /* was it connected by userspace SME? */
 853                 if (!wdev->conn) {
 854                         cfg80211_mlme_down(rdev, dev);
 855                         return 0;
 856                 }
 857
 858                 if (wdev->sme_state == CFG80211_SME_CONNECTING &&
 859                     (wdev->conn->state == CFG80211_CONN_SCANNING ||
 860                      wdev->conn->state == CFG80211_CONN_SCAN_AGAIN)) {
 861                         wdev->sme_state = CFG80211_SME_IDLE;
 862                         kfree(wdev->conn);
 863                         wdev->conn = NULL;
 864                         wdev->ssid_len = 0;
 865                         return 0;
 866                 }
 867
 868                 /* wdev->conn->params.bssid must be set if > SCANNING */
 869                 err = __cfg80211_mlme_deauth(rdev, dev,
 870                                              wdev->conn->params.bssid,
 871                                              NULL, 0, reason);
 872                 if (err)
 873                         return err;
 874         } else {
 875                 err = rdev->ops->disconnect(&rdev->wiphy, dev, reason);
 876                 if (err)
 877                         return err;
 878         }
 879
 880         if (wdev->sme_state == CFG80211_SME_CONNECTED)
 881                 __cfg80211_disconnected(dev, NULL, 0, 0, false);
 882         else if (wdev->sme_state == CFG80211_SME_CONNECTING)
 883                 __cfg80211_connect_result(dev, NULL, NULL, 0, NULL, 0,
 884                                           WLAN_STATUS_UNSPECIFIED_FAILURE,
 885                                           wextev, NULL);
 886
 887         return 0;
 888 }
 889
 890 int cfg80211_disconnect(struct cfg80211_registered_device *rdev,
 891                         struct net_device *dev,
 892                         u16 reason, bool wextev)
 893 {
 894         int err;
 895
 896         wdev_lock(dev->ieee80211_ptr);
 897         err = __cfg80211_disconnect(rdev, dev, reason, wextev);
 898         wdev_unlock(dev->ieee80211_ptr);
 899
 900         return err;
 901 }
 902
 903 void cfg80211_sme_disassoc(struct net_device *dev, int idx)
 904 {
 905         struct wireless_dev *wdev = dev->ieee80211_ptr;
 906         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 907         u8 bssid[ETH_ALEN];
 908
 909         ASSERT_WDEV_LOCK(wdev);
 910
 911         if (!wdev->conn)
 912                 return;
 913
 914         if (wdev->conn->state == CFG80211_CONN_IDLE)
 915                 return;
 916
 917         /*
 918          * Ok, so the association was made by this SME -- we don't
 919          * want it any more so deauthenticate too.
 920          */
 921
 922         if (!wdev->auth_bsses[idx])
 923                 return;
 924
 925         memcpy(bssid, wdev->auth_bsses[idx]->pub.bssid, ETH_ALEN);
 926         if (__cfg80211_mlme_deauth(rdev, dev, bssid,
 927                                    NULL, 0, WLAN_REASON_DEAUTH_LEAVING)) {
 928                 /* whatever -- assume gone anyway */
 929                 cfg80211_unhold_bss(wdev->auth_bsses[idx]);
 930                 cfg80211_put_bss(&wdev->auth_bsses[idx]->pub);
 931                 wdev->auth_bsses[idx] = NULL;
 932         }
 933 }