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/slab.h>
  11 #include <linux/workqueue.h>
  12 #include <linux/wireless.h>
  13 #include <linux/export.h>
  14 #include <net/iw_handler.h>
  15 #include <net/cfg80211.h>
  16 #include <net/rtnetlink.h>
  17 #include "nl80211.h"
  18 #include "reg.h"
  19
  20 struct cfg80211_conn {
  21         struct cfg80211_connect_params params;
  22         /* these are sub-states of the _CONNECTING sme_state */
  23         enum {
  24                 CFG80211_CONN_IDLE,
  25                 CFG80211_CONN_SCANNING,
  26                 CFG80211_CONN_SCAN_AGAIN,
  27                 CFG80211_CONN_AUTHENTICATE_NEXT,
  28                 CFG80211_CONN_AUTHENTICATING,
  29                 CFG80211_CONN_ASSOCIATE_NEXT,
  30                 CFG80211_CONN_ASSOCIATING,
  31                 CFG80211_CONN_DEAUTH_ASSOC_FAIL,
  32         } state;
  33         u8 bssid[ETH_ALEN], prev_bssid[ETH_ALEN];
  34         u8 *ie;
  35         size_t ie_len;
  36         bool auto_auth, prev_bssid_valid;
  37 };
  38
  39 static bool cfg80211_is_all_idle(void)
  40 {
  41         struct cfg80211_registered_device *rdev;
  42         struct wireless_dev *wdev;
  43         bool is_all_idle = true;
  44
  45         mutex_lock(&cfg80211_mutex);
  46
  47         /*
  48          * All devices must be idle as otherwise if you are actively
  49          * scanning some new beacon hints could be learned and would
  50          * count as new regulatory hints.
  51          */
  52         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
  53                 cfg80211_lock_rdev(rdev);
  54                 list_for_each_entry(wdev, &rdev->netdev_list, list) {
  55                         wdev_lock(wdev);
  56                         if (wdev->sme_state != CFG80211_SME_IDLE)
  57                                 is_all_idle = false;
  58                         wdev_unlock(wdev);
  59                 }
  60                 cfg80211_unlock_rdev(rdev);
  61         }
  62
  63         mutex_unlock(&cfg80211_mutex);
  64
  65         return is_all_idle;
  66 }
  67
  68 static void disconnect_work(struct work_struct *work)
  69 {
  70         if (!cfg80211_is_all_idle())
  71                 return;
  72
  73         regulatory_hint_disconnect();
  74 }
  75
  76 static DECLARE_WORK(cfg80211_disconnect_work, disconnect_work);
  77
  78 static int cfg80211_conn_scan(struct wireless_dev *wdev)
  79 {
  80         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
  81         struct cfg80211_scan_request *request;
  82         int n_channels, err;
  83
  84         ASSERT_RTNL();
  85         ASSERT_RDEV_LOCK(rdev);
  86         ASSERT_WDEV_LOCK(wdev);
  87
  88         if (rdev->scan_req)
  89                 return -EBUSY;
  90
  91         if (wdev->conn->params.channel) {
  92                 n_channels = 1;
  93         } else {
  94                 enum ieee80211_band band;
  95                 n_channels = 0;
  96
  97                 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
  98                         if (!wdev->wiphy->bands[band])
  99                                 continue;
 100                         n_channels += wdev->wiphy->bands[band]->n_channels;
 101                 }
 102         }
 103         request = kzalloc(sizeof(*request) + sizeof(request->ssids[0]) +
 104                           sizeof(request->channels[0]) * n_channels,
 105                           GFP_KERNEL);
 106         if (!request)
 107                 return -ENOMEM;
 108
 109         if (wdev->conn->params.channel)
 110                 request->channels[0] = wdev->conn->params.channel;
 111         else {
 112                 int i = 0, j;
 113                 enum ieee80211_band band;
 114                 struct ieee80211_supported_band *bands;
 115                 struct ieee80211_channel *channel;
 116
 117                 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 118                         bands = wdev->wiphy->bands[band];
 119                         if (!bands)
 120                                 continue;
 121                         for (j = 0; j < bands->n_channels; j++) {
 122                                 channel = &bands->channels[j];
 123                                 if (channel->flags & IEEE80211_CHAN_DISABLED)
 124                                         continue;
 125                                 request->channels[i++] = channel;
 126                         }
 127                         request->rates[band] = (1 << bands->n_bitrates) - 1;
 128                 }
 129                 n_channels = i;
 130         }
 131         request->n_channels = n_channels;
 132         request->ssids = (void *)&request->channels[n_channels];
 133         request->n_ssids = 1;
 134
 135         memcpy(request->ssids[0].ssid, wdev->conn->params.ssid,
 136                 wdev->conn->params.ssid_len);
 137         request->ssids[0].ssid_len = wdev->conn->params.ssid_len;
 138
 139         request->dev = wdev->netdev;
 140         request->wiphy = &rdev->wiphy;
 141
 142         rdev->scan_req = request;
 143
 144         err = rdev->ops->scan(wdev->wiphy, wdev->netdev, request);
 145         if (!err) {
 146                 wdev->conn->state = CFG80211_CONN_SCANNING;
 147                 nl80211_send_scan_start(rdev, wdev->netdev);
 148                 dev_hold(wdev->netdev);
 149         } else {
 150                 rdev->scan_req = NULL;
 151                 kfree(request);
 152         }
 153         return err;
 154 }
 155
 156 static int cfg80211_conn_do_work(struct wireless_dev *wdev)
 157 {
 158         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 159         struct cfg80211_connect_params *params;
 160         const u8 *prev_bssid = NULL;
 161         int err;
 162
 163         ASSERT_WDEV_LOCK(wdev);
 164
 165         if (!wdev->conn)
 166                 return 0;
 167
 168         params = &wdev->conn->params;
 169
 170         switch (wdev->conn->state) {
 171         case CFG80211_CONN_SCAN_AGAIN:
 172                 return cfg80211_conn_scan(wdev);
 173         case CFG80211_CONN_AUTHENTICATE_NEXT:
 174                 BUG_ON(!rdev->ops->auth);
 175                 wdev->conn->state = CFG80211_CONN_AUTHENTICATING;
 176                 return __cfg80211_mlme_auth(rdev, wdev->netdev,
 177                                             params->channel, params->auth_type,
 178                                             params->bssid,
 179                                             params->ssid, params->ssid_len,
 180                                             NULL, 0,
 181                                             params->key, params->key_len,
 182                                             params->key_idx, false);
 183         case CFG80211_CONN_ASSOCIATE_NEXT:
 184                 BUG_ON(!rdev->ops->assoc);
 185                 wdev->conn->state = CFG80211_CONN_ASSOCIATING;
 186                 if (wdev->conn->prev_bssid_valid)
 187                         prev_bssid = wdev->conn->prev_bssid;
 188                 err = __cfg80211_mlme_assoc(rdev, wdev->netdev,
 189                                             params->channel, params->bssid,
 190                                             prev_bssid,
 191                                             params->ssid, params->ssid_len,
 192                                             params->ie, params->ie_len,
 193                                             false, &params->crypto);
 194                 if (err)
 195                         __cfg80211_mlme_deauth(rdev, wdev->netdev, params->bssid,
 196                                                NULL, 0,
 197                                                WLAN_REASON_DEAUTH_LEAVING,
 198                                                false);
 199                 return err;
 200         case CFG80211_CONN_DEAUTH_ASSOC_FAIL:
 201                 __cfg80211_mlme_deauth(rdev, wdev->netdev, params->bssid,
 202                                        NULL, 0,
 203                                        WLAN_REASON_DEAUTH_LEAVING, false);
 204                 /* return an error so that we call __cfg80211_connect_result() */
 205                 return -EINVAL;
 206         default:
 207                 return 0;
 208         }
 209 }
 210
 211 void cfg80211_conn_work(struct work_struct *work)
 212 {
 213         struct cfg80211_registered_device *rdev =
 214                 container_of(work, struct cfg80211_registered_device, conn_work);
 215         struct wireless_dev *wdev;
 216         u8 bssid_buf[ETH_ALEN], *bssid = NULL;
 217
 218         rtnl_lock();
 219         cfg80211_lock_rdev(rdev);
 220         mutex_lock(&rdev->devlist_mtx);
 221
 222         list_for_each_entry(wdev, &rdev->netdev_list, list) {
 223                 if (!wdev->netdev)
 224                         continue;
 225
 226                 wdev_lock(wdev);
 227                 if (!netif_running(wdev->netdev)) {
 228                         wdev_unlock(wdev);
 229                         continue;
 230                 }
 231                 if (wdev->sme_state != CFG80211_SME_CONNECTING) {
 232                         wdev_unlock(wdev);
 233                         continue;
 234                 }
 235                 if (wdev->conn->params.bssid) {
 236                         memcpy(bssid_buf, wdev->conn->params.bssid, ETH_ALEN);
 237                         bssid = bssid_buf;
 238                 }
 239                 if (cfg80211_conn_do_work(wdev))
 240                         __cfg80211_connect_result(
 241                                         wdev->netdev, bssid,
 242                                         NULL, 0, NULL, 0,
 243                                         WLAN_STATUS_UNSPECIFIED_FAILURE,
 244                                         false, NULL);
 245                 wdev_unlock(wdev);
 246         }
 247
 248         mutex_unlock(&rdev->devlist_mtx);
 249         cfg80211_unlock_rdev(rdev);
 250         rtnl_unlock();
 251 }
 252
 253 static struct cfg80211_bss *cfg80211_get_conn_bss(struct wireless_dev *wdev)
 254 {
 255         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 256         struct cfg80211_bss *bss;
 257         u16 capa = WLAN_CAPABILITY_ESS;
 258
 259         ASSERT_WDEV_LOCK(wdev);
 260
 261         if (wdev->conn->params.privacy)
 262                 capa |= WLAN_CAPABILITY_PRIVACY;
 263
 264         bss = cfg80211_get_bss(wdev->wiphy, wdev->conn->params.channel,
 265                                wdev->conn->params.bssid,
 266                                wdev->conn->params.ssid,
 267                                wdev->conn->params.ssid_len,
 268                                WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_PRIVACY,
 269                                capa);
 270         if (!bss)
 271                 return NULL;
 272
 273         memcpy(wdev->conn->bssid, bss->bssid, ETH_ALEN);
 274         wdev->conn->params.bssid = wdev->conn->bssid;
 275         wdev->conn->params.channel = bss->channel;
 276         wdev->conn->state = CFG80211_CONN_AUTHENTICATE_NEXT;
 277         schedule_work(&rdev->conn_work);
 278
 279         return bss;
 280 }
 281
 282 static void __cfg80211_sme_scan_done(struct net_device *dev)
 283 {
 284         struct wireless_dev *wdev = dev->ieee80211_ptr;
 285         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 286         struct cfg80211_bss *bss;
 287
 288         ASSERT_WDEV_LOCK(wdev);
 289
 290         if (wdev->sme_state != CFG80211_SME_CONNECTING)
 291                 return;
 292
 293         if (!wdev->conn)
 294                 return;
 295
 296         if (wdev->conn->state != CFG80211_CONN_SCANNING &&
 297             wdev->conn->state != CFG80211_CONN_SCAN_AGAIN)
 298                 return;
 299
 300         bss = cfg80211_get_conn_bss(wdev);
 301         if (bss) {
 302                 cfg80211_put_bss(bss);
 303         } else {
 304                 /* not found */
 305                 if (wdev->conn->state == CFG80211_CONN_SCAN_AGAIN)
 306                         schedule_work(&rdev->conn_work);
 307                 else
 308                         __cfg80211_connect_result(
 309                                         wdev->netdev,
 310                                         wdev->conn->params.bssid,
 311                                         NULL, 0, NULL, 0,
 312                                         WLAN_STATUS_UNSPECIFIED_FAILURE,
 313                                         false, NULL);
 314         }
 315 }
 316
 317 void cfg80211_sme_scan_done(struct net_device *dev)
 318 {
 319         struct wireless_dev *wdev = dev->ieee80211_ptr;
 320
 321         mutex_lock(&wiphy_to_dev(wdev->wiphy)->devlist_mtx);
 322         wdev_lock(wdev);
 323         __cfg80211_sme_scan_done(dev);
 324         wdev_unlock(wdev);
 325         mutex_unlock(&wiphy_to_dev(wdev->wiphy)->devlist_mtx);
 326 }
 327
 328 void cfg80211_sme_rx_auth(struct net_device *dev,
 329                           const u8 *buf, size_t len)
 330 {
 331         struct wireless_dev *wdev = dev->ieee80211_ptr;
 332         struct wiphy *wiphy = wdev->wiphy;
 333         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 334         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)buf;
 335         u16 status_code = le16_to_cpu(mgmt->u.auth.status_code);
 336
 337         ASSERT_WDEV_LOCK(wdev);
 338
 339         /* should only RX auth frames when connecting */
 340         if (wdev->sme_state != CFG80211_SME_CONNECTING)
 341                 return;
 342
 343         if (WARN_ON(!wdev->conn))
 344                 return;
 345
 346         if (status_code == WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG &&
 347             wdev->conn->auto_auth &&
 348             wdev->conn->params.auth_type != NL80211_AUTHTYPE_NETWORK_EAP) {
 349                 /* select automatically between only open, shared, leap */
 350                 switch (wdev->conn->params.auth_type) {
 351                 case NL80211_AUTHTYPE_OPEN_SYSTEM:
 352                         if (wdev->connect_keys)
 353                                 wdev->conn->params.auth_type =
 354                                         NL80211_AUTHTYPE_SHARED_KEY;
 355                         else
 356                                 wdev->conn->params.auth_type =
 357                                         NL80211_AUTHTYPE_NETWORK_EAP;
 358                         break;
 359                 case NL80211_AUTHTYPE_SHARED_KEY:
 360                         wdev->conn->params.auth_type =
 361                                 NL80211_AUTHTYPE_NETWORK_EAP;
 362                         break;
 363                 default:
 364                         /* huh? */
 365                         wdev->conn->params.auth_type =
 366                                 NL80211_AUTHTYPE_OPEN_SYSTEM;
 367                         break;
 368                 }
 369                 wdev->conn->state = CFG80211_CONN_AUTHENTICATE_NEXT;
 370                 schedule_work(&rdev->conn_work);
 371         } else if (status_code != WLAN_STATUS_SUCCESS) {
 372                 __cfg80211_connect_result(dev, mgmt->bssid, NULL, 0, NULL, 0,
 373                                           status_code, false, NULL);
 374         } else if (wdev->sme_state == CFG80211_SME_CONNECTING &&
 375                  wdev->conn->state == CFG80211_CONN_AUTHENTICATING) {
 376                 wdev->conn->state = CFG80211_CONN_ASSOCIATE_NEXT;
 377                 schedule_work(&rdev->conn_work);
 378         }
 379 }
 380
 381 bool cfg80211_sme_failed_reassoc(struct wireless_dev *wdev)
 382 {
 383         struct wiphy *wiphy = wdev->wiphy;
 384         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 385
 386         if (WARN_ON(!wdev->conn))
 387                 return false;
 388
 389         if (!wdev->conn->prev_bssid_valid)
 390                 return false;
 391
 392         /*
 393          * Some stupid APs don't accept reassoc, so we
 394          * need to fall back to trying regular assoc.
 395          */
 396         wdev->conn->prev_bssid_valid = false;
 397         wdev->conn->state = CFG80211_CONN_ASSOCIATE_NEXT;
 398         schedule_work(&rdev->conn_work);
 399
 400         return true;
 401 }
 402
 403 void cfg80211_sme_failed_assoc(struct wireless_dev *wdev)
 404 {
 405         struct wiphy *wiphy = wdev->wiphy;
 406         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 407
 408         wdev->conn->state = CFG80211_CONN_DEAUTH_ASSOC_FAIL;
 409         schedule_work(&rdev->conn_work);
 410 }
 411
 412 void __cfg80211_connect_result(struct net_device *dev, const u8 *bssid,
 413                                const u8 *req_ie, size_t req_ie_len,
 414                                const u8 *resp_ie, size_t resp_ie_len,
 415                                u16 status, bool wextev,
 416                                struct cfg80211_bss *bss)
 417 {
 418         struct wireless_dev *wdev = dev->ieee80211_ptr;
 419         u8 *country_ie;
 420 #ifdef CONFIG_CFG80211_WEXT
 421         union iwreq_data wrqu;
 422 #endif
 423
 424         ASSERT_WDEV_LOCK(wdev);
 425
 426         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION &&
 427                     wdev->iftype != NL80211_IFTYPE_P2P_CLIENT))
 428                 return;
 429
 430         if (wdev->sme_state != CFG80211_SME_CONNECTING)
 431                 return;
 432
 433         nl80211_send_connect_result(wiphy_to_dev(wdev->wiphy), dev,
 434                                     bssid, req_ie, req_ie_len,
 435                                     resp_ie, resp_ie_len,
 436                                     status, GFP_KERNEL);
 437
 438 #ifdef CONFIG_CFG80211_WEXT
 439         if (wextev) {
 440                 if (req_ie && status == WLAN_STATUS_SUCCESS) {
 441                         memset(&wrqu, 0, sizeof(wrqu));
 442                         wrqu.data.length = req_ie_len;
 443                         wireless_send_event(dev, IWEVASSOCREQIE, &wrqu, req_ie);
 444                 }
 445
 446                 if (resp_ie && status == WLAN_STATUS_SUCCESS) {
 447                         memset(&wrqu, 0, sizeof(wrqu));
 448                         wrqu.data.length = resp_ie_len;
 449                         wireless_send_event(dev, IWEVASSOCRESPIE, &wrqu, resp_ie);
 450                 }
 451
 452                 memset(&wrqu, 0, sizeof(wrqu));
 453                 wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 454                 if (bssid && status == WLAN_STATUS_SUCCESS) {
 455                         memcpy(wrqu.ap_addr.sa_data, bssid, ETH_ALEN);
 456                         memcpy(wdev->wext.prev_bssid, bssid, ETH_ALEN);
 457                         wdev->wext.prev_bssid_valid = true;
 458                 }
 459                 wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL);
 460         }
 461 #endif
 462
 463         if (wdev->current_bss) {
 464                 cfg80211_unhold_bss(wdev->current_bss);
 465                 cfg80211_put_bss(&wdev->current_bss->pub);
 466                 wdev->current_bss = NULL;
 467         }
 468
 469         if (wdev->conn)
 470                 wdev->conn->state = CFG80211_CONN_IDLE;
 471
 472         if (status != WLAN_STATUS_SUCCESS) {
 473                 wdev->sme_state = CFG80211_SME_IDLE;
 474                 if (wdev->conn)
 475                         kfree(wdev->conn->ie);
 476                 kfree(wdev->conn);
 477                 wdev->conn = NULL;
 478                 kfree(wdev->connect_keys);
 479                 wdev->connect_keys = NULL;
 480                 wdev->ssid_len = 0;
 481                 return;
 482         }
 483
 484         if (!bss)
 485                 bss = cfg80211_get_bss(wdev->wiphy,
 486                                        wdev->conn ? wdev->conn->params.channel :
 487                                        NULL,
 488                                        bssid,
 489                                        wdev->ssid, wdev->ssid_len,
 490                                        WLAN_CAPABILITY_ESS,
 491                                        WLAN_CAPABILITY_ESS);
 492
 493         if (WARN_ON(!bss))
 494                 return;
 495
 496         cfg80211_hold_bss(bss_from_pub(bss));
 497         wdev->current_bss = bss_from_pub(bss);
 498
 499         wdev->sme_state = CFG80211_SME_CONNECTED;
 500         cfg80211_upload_connect_keys(wdev);
 501
 502         country_ie = (u8 *) ieee80211_bss_get_ie(bss, WLAN_EID_COUNTRY);
 503
 504         if (!country_ie)
 505                 return;
 506
 507         /*
 508          * ieee80211_bss_get_ie() ensures we can access:
 509          * - country_ie + 2, the start of the country ie data, and
 510          * - and country_ie[1] which is the IE length
 511          */
 512         regulatory_hint_11d(wdev->wiphy,
 513                             bss->channel->band,
 514                             country_ie + 2,
 515                             country_ie[1]);
 516 }
 517
 518 void cfg80211_connect_result(struct net_device *dev, const u8 *bssid,
 519                              const u8 *req_ie, size_t req_ie_len,
 520                              const u8 *resp_ie, size_t resp_ie_len,
 521                              u16 status, gfp_t gfp)
 522 {
 523         struct wireless_dev *wdev = dev->ieee80211_ptr;
 524         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 525         struct cfg80211_event *ev;
 526         unsigned long flags;
 527
 528         CFG80211_DEV_WARN_ON(wdev->sme_state != CFG80211_SME_CONNECTING);
 529
 530         ev = kzalloc(sizeof(*ev) + req_ie_len + resp_ie_len, gfp);
 531         if (!ev)
 532                 return;
 533
 534         ev->type = EVENT_CONNECT_RESULT;
 535         if (bssid)
 536                 memcpy(ev->cr.bssid, bssid, ETH_ALEN);
 537         if (req_ie_len) {
 538                 ev->cr.req_ie = ((u8 *)ev) + sizeof(*ev);
 539                 ev->cr.req_ie_len = req_ie_len;
 540                 memcpy((void *)ev->cr.req_ie, req_ie, req_ie_len);
 541         }
 542         if (resp_ie_len) {
 543                 ev->cr.resp_ie = ((u8 *)ev) + sizeof(*ev) + req_ie_len;
 544                 ev->cr.resp_ie_len = resp_ie_len;
 545                 memcpy((void *)ev->cr.resp_ie, resp_ie, resp_ie_len);
 546         }
 547         ev->cr.status = status;
 548
 549         spin_lock_irqsave(&wdev->event_lock, flags);
 550         list_add_tail(&ev->list, &wdev->event_list);
 551         spin_unlock_irqrestore(&wdev->event_lock, flags);
 552         queue_work(cfg80211_wq, &rdev->event_work);
 553 }
 554 EXPORT_SYMBOL(cfg80211_connect_result);
 555
 556 void __cfg80211_roamed(struct wireless_dev *wdev,
 557                        struct ieee80211_channel *channel,
 558                        const u8 *bssid,
 559                        const u8 *req_ie, size_t req_ie_len,
 560                        const u8 *resp_ie, size_t resp_ie_len)
 561 {
 562         struct cfg80211_bss *bss;
 563 #ifdef CONFIG_CFG80211_WEXT
 564         union iwreq_data wrqu;
 565 #endif
 566
 567         ASSERT_WDEV_LOCK(wdev);
 568
 569         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION &&
 570                     wdev->iftype != NL80211_IFTYPE_P2P_CLIENT))
 571                 return;
 572
 573         if (wdev->sme_state != CFG80211_SME_CONNECTED)
 574                 return;
 575
 576         /* internal error -- how did we get to CONNECTED w/o BSS? */
 577         if (WARN_ON(!wdev->current_bss)) {
 578                 return;
 579         }
 580
 581         cfg80211_unhold_bss(wdev->current_bss);
 582         cfg80211_put_bss(&wdev->current_bss->pub);
 583         wdev->current_bss = NULL;
 584
 585         bss = cfg80211_get_bss(wdev->wiphy, channel, bssid,
 586                                wdev->ssid, wdev->ssid_len,
 587                                WLAN_CAPABILITY_ESS, WLAN_CAPABILITY_ESS);
 588
 589         if (WARN_ON(!bss))
 590                 return;
 591
 592         cfg80211_hold_bss(bss_from_pub(bss));
 593         wdev->current_bss = bss_from_pub(bss);
 594
 595         nl80211_send_roamed(wiphy_to_dev(wdev->wiphy), wdev->netdev, bssid,
 596                             req_ie, req_ie_len, resp_ie, resp_ie_len,
 597                             GFP_KERNEL);
 598
 599 #ifdef CONFIG_CFG80211_WEXT
 600         if (req_ie) {
 601                 memset(&wrqu, 0, sizeof(wrqu));
 602                 wrqu.data.length = req_ie_len;
 603                 wireless_send_event(wdev->netdev, IWEVASSOCREQIE,
 604                                     &wrqu, req_ie);
 605         }
 606
 607         if (resp_ie) {
 608                 memset(&wrqu, 0, sizeof(wrqu));
 609                 wrqu.data.length = resp_ie_len;
 610                 wireless_send_event(wdev->netdev, IWEVASSOCRESPIE,
 611                                     &wrqu, resp_ie);
 612         }
 613
 614         memset(&wrqu, 0, sizeof(wrqu));
 615         wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 616         memcpy(wrqu.ap_addr.sa_data, bssid, ETH_ALEN);
 617         memcpy(wdev->wext.prev_bssid, bssid, ETH_ALEN);
 618         wdev->wext.prev_bssid_valid = true;
 619         wireless_send_event(wdev->netdev, SIOCGIWAP, &wrqu, NULL);
 620 #endif
 621 }
 622
 623 void cfg80211_roamed(struct net_device *dev,
 624                      struct ieee80211_channel *channel,
 625                      const u8 *bssid,
 626                      const u8 *req_ie, size_t req_ie_len,
 627                      const u8 *resp_ie, size_t resp_ie_len, gfp_t gfp)
 628 {
 629         struct wireless_dev *wdev = dev->ieee80211_ptr;
 630         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 631         struct cfg80211_event *ev;
 632         unsigned long flags;
 633
 634         CFG80211_DEV_WARN_ON(wdev->sme_state != CFG80211_SME_CONNECTED);
 635
 636         ev = kzalloc(sizeof(*ev) + req_ie_len + resp_ie_len, gfp);
 637         if (!ev)
 638                 return;
 639
 640         ev->type = EVENT_ROAMED;
 641         ev->rm.channel = channel;
 642         memcpy(ev->rm.bssid, bssid, ETH_ALEN);
 643         ev->rm.req_ie = ((u8 *)ev) + sizeof(*ev);
 644         ev->rm.req_ie_len = req_ie_len;
 645         memcpy((void *)ev->rm.req_ie, req_ie, req_ie_len);
 646         ev->rm.resp_ie = ((u8 *)ev) + sizeof(*ev) + req_ie_len;
 647         ev->rm.resp_ie_len = resp_ie_len;
 648         memcpy((void *)ev->rm.resp_ie, resp_ie, resp_ie_len);
 649
 650         spin_lock_irqsave(&wdev->event_lock, flags);
 651         list_add_tail(&ev->list, &wdev->event_list);
 652         spin_unlock_irqrestore(&wdev->event_lock, flags);
 653         queue_work(cfg80211_wq, &rdev->event_work);
 654 }
 655 EXPORT_SYMBOL(cfg80211_roamed);
 656
 657 void __cfg80211_disconnected(struct net_device *dev, const u8 *ie,
 658                              size_t ie_len, u16 reason, bool from_ap)
 659 {
 660         struct wireless_dev *wdev = dev->ieee80211_ptr;
 661         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 662         int i;
 663 #ifdef CONFIG_CFG80211_WEXT
 664         union iwreq_data wrqu;
 665 #endif
 666
 667         ASSERT_WDEV_LOCK(wdev);
 668
 669         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION &&
 670                     wdev->iftype != NL80211_IFTYPE_P2P_CLIENT))
 671                 return;
 672
 673         if (wdev->sme_state != CFG80211_SME_CONNECTED)
 674                 return;
 675
 676         if (wdev->current_bss) {
 677                 cfg80211_unhold_bss(wdev->current_bss);
 678                 cfg80211_put_bss(&wdev->current_bss->pub);
 679         }
 680
 681         wdev->current_bss = NULL;
 682         wdev->sme_state = CFG80211_SME_IDLE;
 683         wdev->ssid_len = 0;
 684
 685         if (wdev->conn) {
 686                 const u8 *bssid;
 687                 int ret;
 688
 689                 kfree(wdev->conn->ie);
 690                 wdev->conn->ie = NULL;
 691                 kfree(wdev->conn);
 692                 wdev->conn = NULL;
 693
 694                 /*
 695                  * If this disconnect was due to a disassoc, we
 696                  * we might still have an auth BSS around. For
 697                  * the userspace SME that's currently expected,
 698                  * but for the kernel SME (nl80211 CONNECT or
 699                  * wireless extensions) we want to clear up all
 700                  * state.
 701                  */
 702                 for (i = 0; i < MAX_AUTH_BSSES; i++) {
 703                         if (!wdev->auth_bsses[i])
 704                                 continue;
 705                         bssid = wdev->auth_bsses[i]->pub.bssid;
 706                         ret = __cfg80211_mlme_deauth(rdev, dev, bssid, NULL, 0,
 707                                                 WLAN_REASON_DEAUTH_LEAVING,
 708                                                 false);
 709                         WARN(ret, "deauth failed: %d\n", ret);
 710                 }
 711         }
 712
 713         nl80211_send_disconnected(rdev, dev, reason, ie, ie_len, from_ap);
 714
 715         /*
 716          * Delete all the keys ... pairwise keys can't really
 717          * exist any more anyway, but default keys might.
 718          */
 719         if (rdev->ops->del_key)
 720                 for (i = 0; i < 6; i++)
 721                         rdev->ops->del_key(wdev->wiphy, dev, i, false, NULL);
 722
 723 #ifdef CONFIG_CFG80211_WEXT
 724         memset(&wrqu, 0, sizeof(wrqu));
 725         wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 726         wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL);
 727         wdev->wext.connect.ssid_len = 0;
 728 #endif
 729
 730         schedule_work(&cfg80211_disconnect_work);
 731 }
 732
 733 void cfg80211_disconnected(struct net_device *dev, u16 reason,
 734                            u8 *ie, size_t ie_len, gfp_t gfp)
 735 {
 736         struct wireless_dev *wdev = dev->ieee80211_ptr;
 737         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 738         struct cfg80211_event *ev;
 739         unsigned long flags;
 740
 741         CFG80211_DEV_WARN_ON(wdev->sme_state != CFG80211_SME_CONNECTED);
 742
 743         ev = kzalloc(sizeof(*ev) + ie_len, gfp);
 744         if (!ev)
 745                 return;
 746
 747         ev->type = EVENT_DISCONNECTED;
 748         ev->dc.ie = ((u8 *)ev) + sizeof(*ev);
 749         ev->dc.ie_len = ie_len;
 750         memcpy((void *)ev->dc.ie, ie, ie_len);
 751         ev->dc.reason = reason;
 752
 753         spin_lock_irqsave(&wdev->event_lock, flags);
 754         list_add_tail(&ev->list, &wdev->event_list);
 755         spin_unlock_irqrestore(&wdev->event_lock, flags);
 756         queue_work(cfg80211_wq, &rdev->event_work);
 757 }
 758 EXPORT_SYMBOL(cfg80211_disconnected);
 759
 760 int __cfg80211_connect(struct cfg80211_registered_device *rdev,
 761                        struct net_device *dev,
 762                        struct cfg80211_connect_params *connect,
 763                        struct cfg80211_cached_keys *connkeys,
 764                        const u8 *prev_bssid)
 765 {
 766         struct wireless_dev *wdev = dev->ieee80211_ptr;
 767         struct cfg80211_bss *bss = NULL;
 768         int err;
 769
 770         ASSERT_WDEV_LOCK(wdev);
 771
 772         if (wdev->sme_state != CFG80211_SME_IDLE)
 773                 return -EALREADY;
 774
 775         if (WARN_ON(wdev->connect_keys)) {
 776                 kfree(wdev->connect_keys);
 777                 wdev->connect_keys = NULL;
 778         }
 779
 780         if (connkeys && connkeys->def >= 0) {
 781                 int idx;
 782                 u32 cipher;
 783
 784                 idx = connkeys->def;
 785                 cipher = connkeys->params[idx].cipher;
 786                 /* If given a WEP key we may need it for shared key auth */
 787                 if (cipher == WLAN_CIPHER_SUITE_WEP40 ||
 788                     cipher == WLAN_CIPHER_SUITE_WEP104) {
 789                         connect->key_idx = idx;
 790                         connect->key = connkeys->params[idx].key;
 791                         connect->key_len = connkeys->params[idx].key_len;
 792
 793                         /*
 794                          * If ciphers are not set (e.g. when going through
 795                          * iwconfig), we have to set them appropriately here.
 796                          */
 797                         if (connect->crypto.cipher_group == 0)
 798                                 connect->crypto.cipher_group = cipher;
 799
 800                         if (connect->crypto.n_ciphers_pairwise == 0) {
 801                                 connect->crypto.n_ciphers_pairwise = 1;
 802                                 connect->crypto.ciphers_pairwise[0] = cipher;
 803                         }
 804                 }
 805         }
 806
 807         if (!rdev->ops->connect) {
 808                 if (!rdev->ops->auth || !rdev->ops->assoc)
 809                         return -EOPNOTSUPP;
 810
 811                 if (WARN_ON(wdev->conn))
 812                         return -EINPROGRESS;
 813
 814                 wdev->conn = kzalloc(sizeof(*wdev->conn), GFP_KERNEL);
 815                 if (!wdev->conn)
 816                         return -ENOMEM;
 817
 818                 /*
 819                  * Copy all parameters, and treat explicitly IEs, BSSID, SSID.
 820                  */
 821                 memcpy(&wdev->conn->params, connect, sizeof(*connect));
 822                 if (connect->bssid) {
 823                         wdev->conn->params.bssid = wdev->conn->bssid;
 824                         memcpy(wdev->conn->bssid, connect->bssid, ETH_ALEN);
 825                 }
 826
 827                 if (connect->ie) {
 828                         wdev->conn->ie = kmemdup(connect->ie, connect->ie_len,
 829                                                 GFP_KERNEL);
 830                         wdev->conn->params.ie = wdev->conn->ie;
 831                         if (!wdev->conn->ie) {
 832                                 kfree(wdev->conn);
 833                                 wdev->conn = NULL;
 834                                 return -ENOMEM;
 835                         }
 836                 }
 837
 838                 if (connect->auth_type == NL80211_AUTHTYPE_AUTOMATIC) {
 839                         wdev->conn->auto_auth = true;
 840                         /* start with open system ... should mostly work */
 841                         wdev->conn->params.auth_type =
 842                                 NL80211_AUTHTYPE_OPEN_SYSTEM;
 843                 } else {
 844                         wdev->conn->auto_auth = false;
 845                 }
 846
 847                 memcpy(wdev->ssid, connect->ssid, connect->ssid_len);
 848                 wdev->ssid_len = connect->ssid_len;
 849                 wdev->conn->params.ssid = wdev->ssid;
 850                 wdev->conn->params.ssid_len = connect->ssid_len;
 851
 852                 /* see if we have the bss already */
 853                 bss = cfg80211_get_conn_bss(wdev);
 854
 855                 wdev->sme_state = CFG80211_SME_CONNECTING;
 856                 wdev->connect_keys = connkeys;
 857
 858                 if (prev_bssid) {
 859                         memcpy(wdev->conn->prev_bssid, prev_bssid, ETH_ALEN);
 860                         wdev->conn->prev_bssid_valid = true;
 861                 }
 862
 863                 /* we're good if we have a matching bss struct */
 864                 if (bss) {
 865                         wdev->conn->state = CFG80211_CONN_AUTHENTICATE_NEXT;
 866                         err = cfg80211_conn_do_work(wdev);
 867                         cfg80211_put_bss(bss);
 868                 } else {
 869                         /* otherwise we'll need to scan for the AP first */
 870                         err = cfg80211_conn_scan(wdev);
 871                         /*
 872                          * If we can't scan right now, then we need to scan again
 873                          * after the current scan finished, since the parameters
 874                          * changed (unless we find a good AP anyway).
 875                          */
 876                         if (err == -EBUSY) {
 877                                 err = 0;
 878                                 wdev->conn->state = CFG80211_CONN_SCAN_AGAIN;
 879                         }
 880                 }
 881                 if (err) {
 882                         kfree(wdev->conn->ie);
 883                         kfree(wdev->conn);
 884                         wdev->conn = NULL;
 885                         wdev->sme_state = CFG80211_SME_IDLE;
 886                         wdev->connect_keys = NULL;
 887                         wdev->ssid_len = 0;
 888                 }
 889
 890                 return err;
 891         } else {
 892                 wdev->sme_state = CFG80211_SME_CONNECTING;
 893                 wdev->connect_keys = connkeys;
 894                 err = rdev->ops->connect(&rdev->wiphy, dev, connect);
 895                 if (err) {
 896                         wdev->connect_keys = NULL;
 897                         wdev->sme_state = CFG80211_SME_IDLE;
 898                         return err;
 899                 }
 900
 901                 memcpy(wdev->ssid, connect->ssid, connect->ssid_len);
 902                 wdev->ssid_len = connect->ssid_len;
 903
 904                 return 0;
 905         }
 906 }
 907
 908 int cfg80211_connect(struct cfg80211_registered_device *rdev,
 909                      struct net_device *dev,
 910                      struct cfg80211_connect_params *connect,
 911                      struct cfg80211_cached_keys *connkeys)
 912 {
 913         int err;
 914
 915         mutex_lock(&rdev->devlist_mtx);
 916         wdev_lock(dev->ieee80211_ptr);
 917         err = __cfg80211_connect(rdev, dev, connect, connkeys, NULL);
 918         wdev_unlock(dev->ieee80211_ptr);
 919         mutex_unlock(&rdev->devlist_mtx);
 920
 921         return err;
 922 }
 923
 924 int __cfg80211_disconnect(struct cfg80211_registered_device *rdev,
 925                           struct net_device *dev, u16 reason, bool wextev)
 926 {
 927         struct wireless_dev *wdev = dev->ieee80211_ptr;
 928         int err;
 929
 930         ASSERT_WDEV_LOCK(wdev);
 931
 932         if (wdev->sme_state == CFG80211_SME_IDLE)
 933                 return -EINVAL;
 934
 935         kfree(wdev->connect_keys);
 936         wdev->connect_keys = NULL;
 937
 938         if (!rdev->ops->disconnect) {
 939                 if (!rdev->ops->deauth)
 940                         return -EOPNOTSUPP;
 941
 942                 /* was it connected by userspace SME? */
 943                 if (!wdev->conn) {
 944                         cfg80211_mlme_down(rdev, dev);
 945                         return 0;
 946                 }
 947
 948                 if (wdev->sme_state == CFG80211_SME_CONNECTING &&
 949                     (wdev->conn->state == CFG80211_CONN_SCANNING ||
 950                      wdev->conn->state == CFG80211_CONN_SCAN_AGAIN)) {
 951                         wdev->sme_state = CFG80211_SME_IDLE;
 952                         kfree(wdev->conn->ie);
 953                         kfree(wdev->conn);
 954                         wdev->conn = NULL;
 955                         wdev->ssid_len = 0;
 956                         return 0;
 957                 }
 958
 959                 /* wdev->conn->params.bssid must be set if > SCANNING */
 960                 err = __cfg80211_mlme_deauth(rdev, dev,
 961                                              wdev->conn->params.bssid,
 962                                              NULL, 0, reason, false);
 963                 if (err)
 964                         return err;
 965         } else {
 966                 err = rdev->ops->disconnect(&rdev->wiphy, dev, reason);
 967                 if (err)
 968                         return err;
 969         }
 970
 971         if (wdev->sme_state == CFG80211_SME_CONNECTED)
 972                 __cfg80211_disconnected(dev, NULL, 0, 0, false);
 973         else if (wdev->sme_state == CFG80211_SME_CONNECTING)
 974                 __cfg80211_connect_result(dev, NULL, NULL, 0, NULL, 0,
 975                                           WLAN_STATUS_UNSPECIFIED_FAILURE,
 976                                           wextev, NULL);
 977
 978         return 0;
 979 }
 980
 981 int cfg80211_disconnect(struct cfg80211_registered_device *rdev,
 982                         struct net_device *dev,
 983                         u16 reason, bool wextev)
 984 {
 985         int err;
 986
 987         wdev_lock(dev->ieee80211_ptr);
 988         err = __cfg80211_disconnect(rdev, dev, reason, wextev);
 989         wdev_unlock(dev->ieee80211_ptr);
 990
 991         return err;
 992 }
 993
 994 void cfg80211_sme_disassoc(struct net_device *dev, int idx)
 995 {
 996         struct wireless_dev *wdev = dev->ieee80211_ptr;
 997         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 998         u8 bssid[ETH_ALEN];
 999
1000         ASSERT_WDEV_LOCK(wdev);
1001
1002         if (!wdev->conn)
1003                 return;
1004
1005         if (wdev->conn->state == CFG80211_CONN_IDLE)
1006                 return;
1007
1008         /*
1009          * Ok, so the association was made by this SME -- we don't
1010          * want it any more so deauthenticate too.
1011          */
1012
1013         if (!wdev->auth_bsses[idx])
1014                 return;
1015
1016         memcpy(bssid, wdev->auth_bsses[idx]->pub.bssid, ETH_ALEN);
1017         if (__cfg80211_mlme_deauth(rdev, dev, bssid,
1018                                    NULL, 0, WLAN_REASON_DEAUTH_LEAVING,
1019                                    false)) {
1020                 /* whatever -- assume gone anyway */
1021                 cfg80211_unhold_bss(wdev->auth_bsses[idx]);
1022                 cfg80211_put_bss(&wdev->auth_bsses[idx]->pub);
1023                 wdev->auth_bsses[idx] = NULL;
1024         }
1025 }