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 #include "rdev-ops.h"
  20
  21 struct cfg80211_conn {
  22         struct cfg80211_connect_params params;
  23         /* these are sub-states of the _CONNECTING sme_state */
  24         enum {
  25                 CFG80211_CONN_IDLE,
  26                 CFG80211_CONN_SCANNING,
  27                 CFG80211_CONN_SCAN_AGAIN,
  28                 CFG80211_CONN_AUTHENTICATE_NEXT,
  29                 CFG80211_CONN_AUTHENTICATING,
  30                 CFG80211_CONN_ASSOCIATE_NEXT,
  31                 CFG80211_CONN_ASSOCIATING,
  32                 CFG80211_CONN_DEAUTH_ASSOC_FAIL,
  33         } state;
  34         u8 bssid[ETH_ALEN], prev_bssid[ETH_ALEN];
  35         u8 *ie;
  36         size_t ie_len;
  37         bool auto_auth, prev_bssid_valid;
  38 };
  39
  40 static bool cfg80211_is_all_idle(void)
  41 {
  42         struct cfg80211_registered_device *rdev;
  43         struct wireless_dev *wdev;
  44         bool is_all_idle = true;
  45
  46         mutex_lock(&cfg80211_mutex);
  47
  48         /*
  49          * All devices must be idle as otherwise if you are actively
  50          * scanning some new beacon hints could be learned and would
  51          * count as new regulatory hints.
  52          */
  53         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
  54                 cfg80211_lock_rdev(rdev);
  55                 list_for_each_entry(wdev, &rdev->wdev_list, list) {
  56                         wdev_lock(wdev);
  57                         if (wdev->sme_state != CFG80211_SME_IDLE)
  58                                 is_all_idle = false;
  59                         wdev_unlock(wdev);
  60                 }
  61                 cfg80211_unlock_rdev(rdev);
  62         }
  63
  64         mutex_unlock(&cfg80211_mutex);
  65
  66         return is_all_idle;
  67 }
  68
  69 static void disconnect_work(struct work_struct *work)
  70 {
  71         if (!cfg80211_is_all_idle())
  72                 return;
  73
  74         regulatory_hint_disconnect();
  75 }
  76
  77 static DECLARE_WORK(cfg80211_disconnect_work, disconnect_work);
  78
  79 static int cfg80211_conn_scan(struct wireless_dev *wdev)
  80 {
  81         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
  82         struct cfg80211_scan_request *request;
  83         int n_channels, err;
  84
  85         ASSERT_RTNL();
  86         ASSERT_RDEV_LOCK(rdev);
  87         ASSERT_WDEV_LOCK(wdev);
  88
  89         if (rdev->scan_req)
  90                 return -EBUSY;
  91
  92         if (wdev->conn->params.channel) {
  93                 n_channels = 1;
  94         } else {
  95                 enum ieee80211_band band;
  96                 n_channels = 0;
  97
  98                 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
  99                         if (!wdev->wiphy->bands[band])
 100                                 continue;
 101                         n_channels += wdev->wiphy->bands[band]->n_channels;
 102                 }
 103         }
 104         request = kzalloc(sizeof(*request) + sizeof(request->ssids[0]) +
 105                           sizeof(request->channels[0]) * n_channels,
 106                           GFP_KERNEL);
 107         if (!request)
 108                 return -ENOMEM;
 109
 110         if (wdev->conn->params.channel)
 111                 request->channels[0] = wdev->conn->params.channel;
 112         else {
 113                 int i = 0, j;
 114                 enum ieee80211_band band;
 115                 struct ieee80211_supported_band *bands;
 116                 struct ieee80211_channel *channel;
 117
 118                 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 119                         bands = wdev->wiphy->bands[band];
 120                         if (!bands)
 121                                 continue;
 122                         for (j = 0; j < bands->n_channels; j++) {
 123                                 channel = &bands->channels[j];
 124                                 if (channel->flags & IEEE80211_CHAN_DISABLED)
 125                                         continue;
 126                                 request->channels[i++] = channel;
 127                         }
 128                         request->rates[band] = (1 << bands->n_bitrates) - 1;
 129                 }
 130                 n_channels = i;
 131         }
 132         request->n_channels = n_channels;
 133         request->ssids = (void *)&request->channels[n_channels];
 134         request->n_ssids = 1;
 135
 136         memcpy(request->ssids[0].ssid, wdev->conn->params.ssid,
 137                 wdev->conn->params.ssid_len);
 138         request->ssids[0].ssid_len = wdev->conn->params.ssid_len;
 139
 140         request->wdev = wdev;
 141         request->wiphy = &rdev->wiphy;
 142         request->scan_start = jiffies;
 143
 144         rdev->scan_req = request;
 145
 146         err = rdev_scan(rdev, request);
 147         if (!err) {
 148                 wdev->conn->state = CFG80211_CONN_SCANNING;
 149                 nl80211_send_scan_start(rdev, wdev);
 150                 dev_hold(wdev->netdev);
 151         } else {
 152                 rdev->scan_req = NULL;
 153                 kfree(request);
 154         }
 155         return err;
 156 }
 157
 158 static int cfg80211_conn_do_work(struct wireless_dev *wdev)
 159 {
 160         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 161         struct cfg80211_connect_params *params;
 162         const u8 *prev_bssid = NULL;
 163         int err;
 164
 165         ASSERT_WDEV_LOCK(wdev);
 166
 167         if (!wdev->conn)
 168                 return 0;
 169
 170         params = &wdev->conn->params;
 171
 172         switch (wdev->conn->state) {
 173         case CFG80211_CONN_SCAN_AGAIN:
 174                 return cfg80211_conn_scan(wdev);
 175         case CFG80211_CONN_AUTHENTICATE_NEXT:
 176                 BUG_ON(!rdev->ops->auth);
 177                 wdev->conn->state = CFG80211_CONN_AUTHENTICATING;
 178                 return __cfg80211_mlme_auth(rdev, wdev->netdev,
 179                                             params->channel, params->auth_type,
 180                                             params->bssid,
 181                                             params->ssid, params->ssid_len,
 182                                             NULL, 0,
 183                                             params->key, params->key_len,
 184                                             params->key_idx, NULL, 0);
 185         case CFG80211_CONN_ASSOCIATE_NEXT:
 186                 BUG_ON(!rdev->ops->assoc);
 187                 wdev->conn->state = CFG80211_CONN_ASSOCIATING;
 188                 if (wdev->conn->prev_bssid_valid)
 189                         prev_bssid = wdev->conn->prev_bssid;
 190                 err = __cfg80211_mlme_assoc(rdev, wdev->netdev,
 191                                             params->channel, params->bssid,
 192                                             prev_bssid,
 193                                             params->ssid, params->ssid_len,
 194                                             params->ie, params->ie_len,
 195                                             params->mfp != NL80211_MFP_NO,
 196                                             &params->crypto,
 197                                             params->flags, &params->ht_capa,
 198                                             &params->ht_capa_mask);
 199                 if (err)
 200                         __cfg80211_mlme_deauth(rdev, wdev->netdev, params->bssid,
 201                                                NULL, 0,
 202                                                WLAN_REASON_DEAUTH_LEAVING,
 203                                                false);
 204                 return err;
 205         case CFG80211_CONN_DEAUTH_ASSOC_FAIL:
 206                 __cfg80211_mlme_deauth(rdev, wdev->netdev, params->bssid,
 207                                        NULL, 0,
 208                                        WLAN_REASON_DEAUTH_LEAVING, false);
 209                 /* return an error so that we call __cfg80211_connect_result() */
 210                 return -EINVAL;
 211         default:
 212                 return 0;
 213         }
 214 }
 215
 216 void cfg80211_conn_work(struct work_struct *work)
 217 {
 218         struct cfg80211_registered_device *rdev =
 219                 container_of(work, struct cfg80211_registered_device, conn_work);
 220         struct wireless_dev *wdev;
 221         u8 bssid_buf[ETH_ALEN], *bssid = NULL;
 222
 223         rtnl_lock();
 224         cfg80211_lock_rdev(rdev);
 225         mutex_lock(&rdev->devlist_mtx);
 226
 227         list_for_each_entry(wdev, &rdev->wdev_list, list) {
 228                 wdev_lock(wdev);
 229                 if (!netif_running(wdev->netdev)) {
 230                         wdev_unlock(wdev);
 231                         continue;
 232                 }
 233                 if (wdev->sme_state != CFG80211_SME_CONNECTING) {
 234                         wdev_unlock(wdev);
 235                         continue;
 236                 }
 237                 if (wdev->conn->params.bssid) {
 238                         memcpy(bssid_buf, wdev->conn->params.bssid, ETH_ALEN);
 239                         bssid = bssid_buf;
 240                 }
 241                 if (cfg80211_conn_do_work(wdev))
 242                         __cfg80211_connect_result(
 243                                         wdev->netdev, bssid,
 244                                         NULL, 0, NULL, 0,
 245                                         WLAN_STATUS_UNSPECIFIED_FAILURE,
 246                                         false, NULL);
 247                 wdev_unlock(wdev);
 248         }
 249
 250         mutex_unlock(&rdev->devlist_mtx);
 251         cfg80211_unlock_rdev(rdev);
 252         rtnl_unlock();
 253 }
 254
 255 static struct cfg80211_bss *cfg80211_get_conn_bss(struct wireless_dev *wdev)
 256 {
 257         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 258         struct cfg80211_bss *bss;
 259         u16 capa = WLAN_CAPABILITY_ESS;
 260
 261         ASSERT_WDEV_LOCK(wdev);
 262
 263         if (wdev->conn->params.privacy)
 264                 capa |= WLAN_CAPABILITY_PRIVACY;
 265
 266         bss = cfg80211_get_bss(wdev->wiphy, wdev->conn->params.channel,
 267                                wdev->conn->params.bssid,
 268                                wdev->conn->params.ssid,
 269                                wdev->conn->params.ssid_len,
 270                                WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_PRIVACY,
 271                                capa);
 272         if (!bss)
 273                 return NULL;
 274
 275         memcpy(wdev->conn->bssid, bss->bssid, ETH_ALEN);
 276         wdev->conn->params.bssid = wdev->conn->bssid;
 277         wdev->conn->params.channel = bss->channel;
 278         wdev->conn->state = CFG80211_CONN_AUTHENTICATE_NEXT;
 279         schedule_work(&rdev->conn_work);
 280
 281         return bss;
 282 }
 283
 284 static void __cfg80211_sme_scan_done(struct net_device *dev)
 285 {
 286         struct wireless_dev *wdev = dev->ieee80211_ptr;
 287         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 288         struct cfg80211_bss *bss;
 289
 290         ASSERT_WDEV_LOCK(wdev);
 291
 292         if (wdev->sme_state != CFG80211_SME_CONNECTING)
 293                 return;
 294
 295         if (!wdev->conn)
 296                 return;
 297
 298         if (wdev->conn->state != CFG80211_CONN_SCANNING &&
 299             wdev->conn->state != CFG80211_CONN_SCAN_AGAIN)
 300                 return;
 301
 302         bss = cfg80211_get_conn_bss(wdev);
 303         if (bss) {
 304                 cfg80211_put_bss(&rdev->wiphy, bss);
 305         } else {
 306                 /* not found */
 307                 if (wdev->conn->state == CFG80211_CONN_SCAN_AGAIN)
 308                         schedule_work(&rdev->conn_work);
 309                 else
 310                         __cfg80211_connect_result(
 311                                         wdev->netdev,
 312                                         wdev->conn->params.bssid,
 313                                         NULL, 0, NULL, 0,
 314                                         WLAN_STATUS_UNSPECIFIED_FAILURE,
 315                                         false, NULL);
 316         }
 317 }
 318
 319 void cfg80211_sme_scan_done(struct net_device *dev)
 320 {
 321         struct wireless_dev *wdev = dev->ieee80211_ptr;
 322
 323         mutex_lock(&wiphy_to_dev(wdev->wiphy)->devlist_mtx);
 324         wdev_lock(wdev);
 325         __cfg80211_sme_scan_done(dev);
 326         wdev_unlock(wdev);
 327         mutex_unlock(&wiphy_to_dev(wdev->wiphy)->devlist_mtx);
 328 }
 329
 330 void cfg80211_sme_rx_auth(struct net_device *dev,
 331                           const u8 *buf, size_t len)
 332 {
 333         struct wireless_dev *wdev = dev->ieee80211_ptr;
 334         struct wiphy *wiphy = wdev->wiphy;
 335         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 336         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)buf;
 337         u16 status_code = le16_to_cpu(mgmt->u.auth.status_code);
 338
 339         ASSERT_WDEV_LOCK(wdev);
 340
 341         /* should only RX auth frames when connecting */
 342         if (wdev->sme_state != CFG80211_SME_CONNECTING)
 343                 return;
 344
 345         if (WARN_ON(!wdev->conn))
 346                 return;
 347
 348         if (status_code == WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG &&
 349             wdev->conn->auto_auth &&
 350             wdev->conn->params.auth_type != NL80211_AUTHTYPE_NETWORK_EAP) {
 351                 /* select automatically between only open, shared, leap */
 352                 switch (wdev->conn->params.auth_type) {
 353                 case NL80211_AUTHTYPE_OPEN_SYSTEM:
 354                         if (wdev->connect_keys)
 355                                 wdev->conn->params.auth_type =
 356                                         NL80211_AUTHTYPE_SHARED_KEY;
 357                         else
 358                                 wdev->conn->params.auth_type =
 359                                         NL80211_AUTHTYPE_NETWORK_EAP;
 360                         break;
 361                 case NL80211_AUTHTYPE_SHARED_KEY:
 362                         wdev->conn->params.auth_type =
 363                                 NL80211_AUTHTYPE_NETWORK_EAP;
 364                         break;
 365                 default:
 366                         /* huh? */
 367                         wdev->conn->params.auth_type =
 368                                 NL80211_AUTHTYPE_OPEN_SYSTEM;
 369                         break;
 370                 }
 371                 wdev->conn->state = CFG80211_CONN_AUTHENTICATE_NEXT;
 372                 schedule_work(&rdev->conn_work);
 373         } else if (status_code != WLAN_STATUS_SUCCESS) {
 374                 __cfg80211_connect_result(dev, mgmt->bssid, NULL, 0, NULL, 0,
 375                                           status_code, false, NULL);
 376         } else if (wdev->sme_state == CFG80211_SME_CONNECTING &&
 377                  wdev->conn->state == CFG80211_CONN_AUTHENTICATING) {
 378                 wdev->conn->state = CFG80211_CONN_ASSOCIATE_NEXT;
 379                 schedule_work(&rdev->conn_work);
 380         }
 381 }
 382
 383 bool cfg80211_sme_failed_reassoc(struct wireless_dev *wdev)
 384 {
 385         struct wiphy *wiphy = wdev->wiphy;
 386         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 387
 388         if (WARN_ON(!wdev->conn))
 389                 return false;
 390
 391         if (!wdev->conn->prev_bssid_valid)
 392                 return false;
 393
 394         /*
 395          * Some stupid APs don't accept reassoc, so we
 396          * need to fall back to trying regular assoc.
 397          */
 398         wdev->conn->prev_bssid_valid = false;
 399         wdev->conn->state = CFG80211_CONN_ASSOCIATE_NEXT;
 400         schedule_work(&rdev->conn_work);
 401
 402         return true;
 403 }
 404
 405 void cfg80211_sme_failed_assoc(struct wireless_dev *wdev)
 406 {
 407         struct wiphy *wiphy = wdev->wiphy;
 408         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 409
 410         wdev->conn->state = CFG80211_CONN_DEAUTH_ASSOC_FAIL;
 411         schedule_work(&rdev->conn_work);
 412 }
 413
 414 void __cfg80211_connect_result(struct net_device *dev, const u8 *bssid,
 415                                const u8 *req_ie, size_t req_ie_len,
 416                                const u8 *resp_ie, size_t resp_ie_len,
 417                                u16 status, bool wextev,
 418                                struct cfg80211_bss *bss)
 419 {
 420         struct wireless_dev *wdev = dev->ieee80211_ptr;
 421         const u8 *country_ie;
 422 #ifdef CONFIG_CFG80211_WEXT
 423         union iwreq_data wrqu;
 424 #endif
 425
 426         ASSERT_WDEV_LOCK(wdev);
 427
 428         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION &&
 429                     wdev->iftype != NL80211_IFTYPE_P2P_CLIENT))
 430                 return;
 431
 432         if (wdev->sme_state != CFG80211_SME_CONNECTING)
 433                 return;
 434
 435         nl80211_send_connect_result(wiphy_to_dev(wdev->wiphy), dev,
 436                                     bssid, req_ie, req_ie_len,
 437                                     resp_ie, resp_ie_len,
 438                                     status, GFP_KERNEL);
 439
 440 #ifdef CONFIG_CFG80211_WEXT
 441         if (wextev) {
 442                 if (req_ie && status == WLAN_STATUS_SUCCESS) {
 443                         memset(&wrqu, 0, sizeof(wrqu));
 444                         wrqu.data.length = req_ie_len;
 445                         wireless_send_event(dev, IWEVASSOCREQIE, &wrqu, req_ie);
 446                 }
 447
 448                 if (resp_ie && status == WLAN_STATUS_SUCCESS) {
 449                         memset(&wrqu, 0, sizeof(wrqu));
 450                         wrqu.data.length = resp_ie_len;
 451                         wireless_send_event(dev, IWEVASSOCRESPIE, &wrqu, resp_ie);
 452                 }
 453
 454                 memset(&wrqu, 0, sizeof(wrqu));
 455                 wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 456                 if (bssid && status == WLAN_STATUS_SUCCESS) {
 457                         memcpy(wrqu.ap_addr.sa_data, bssid, ETH_ALEN);
 458                         memcpy(wdev->wext.prev_bssid, bssid, ETH_ALEN);
 459                         wdev->wext.prev_bssid_valid = true;
 460                 }
 461                 wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL);
 462         }
 463 #endif
 464
 465         if (wdev->current_bss) {
 466                 cfg80211_unhold_bss(wdev->current_bss);
 467                 cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
 468                 wdev->current_bss = NULL;
 469         }
 470
 471         if (wdev->conn)
 472                 wdev->conn->state = CFG80211_CONN_IDLE;
 473
 474         if (status != WLAN_STATUS_SUCCESS) {
 475                 wdev->sme_state = CFG80211_SME_IDLE;
 476                 if (wdev->conn)
 477                         kfree(wdev->conn->ie);
 478                 kfree(wdev->conn);
 479                 wdev->conn = NULL;
 480                 kfree(wdev->connect_keys);
 481                 wdev->connect_keys = NULL;
 482                 wdev->ssid_len = 0;
 483                 cfg80211_put_bss(wdev->wiphy, bss);
 484                 return;
 485         }
 486
 487         if (!bss)
 488                 bss = cfg80211_get_bss(wdev->wiphy,
 489                                        wdev->conn ? wdev->conn->params.channel :
 490                                        NULL,
 491                                        bssid,
 492                                        wdev->ssid, wdev->ssid_len,
 493                                        WLAN_CAPABILITY_ESS,
 494                                        WLAN_CAPABILITY_ESS);
 495
 496         if (WARN_ON(!bss))
 497                 return;
 498
 499         cfg80211_hold_bss(bss_from_pub(bss));
 500         wdev->current_bss = bss_from_pub(bss);
 501
 502         wdev->sme_state = CFG80211_SME_CONNECTED;
 503         cfg80211_upload_connect_keys(wdev);
 504
 505         rcu_read_lock();
 506         country_ie = ieee80211_bss_get_ie(bss, WLAN_EID_COUNTRY);
 507         if (!country_ie) {
 508                 rcu_read_unlock();
 509                 return;
 510         }
 511
 512         country_ie = kmemdup(country_ie, 2 + country_ie[1], GFP_ATOMIC);
 513         rcu_read_unlock();
 514
 515         if (!country_ie)
 516                 return;
 517
 518         /*
 519          * ieee80211_bss_get_ie() ensures we can access:
 520          * - country_ie + 2, the start of the country ie data, and
 521          * - and country_ie[1] which is the IE length
 522          */
 523         regulatory_hint_11d(wdev->wiphy, bss->channel->band,
 524                             country_ie + 2, country_ie[1]);
 525         kfree(country_ie);
 526 }
 527
 528 void cfg80211_connect_result(struct net_device *dev, const u8 *bssid,
 529                              const u8 *req_ie, size_t req_ie_len,
 530                              const u8 *resp_ie, size_t resp_ie_len,
 531                              u16 status, gfp_t gfp)
 532 {
 533         struct wireless_dev *wdev = dev->ieee80211_ptr;
 534         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 535         struct cfg80211_event *ev;
 536         unsigned long flags;
 537
 538         CFG80211_DEV_WARN_ON(wdev->sme_state != CFG80211_SME_CONNECTING);
 539
 540         ev = kzalloc(sizeof(*ev) + req_ie_len + resp_ie_len, gfp);
 541         if (!ev)
 542                 return;
 543
 544         ev->type = EVENT_CONNECT_RESULT;
 545         if (bssid)
 546                 memcpy(ev->cr.bssid, bssid, ETH_ALEN);
 547         if (req_ie_len) {
 548                 ev->cr.req_ie = ((u8 *)ev) + sizeof(*ev);
 549                 ev->cr.req_ie_len = req_ie_len;
 550                 memcpy((void *)ev->cr.req_ie, req_ie, req_ie_len);
 551         }
 552         if (resp_ie_len) {
 553                 ev->cr.resp_ie = ((u8 *)ev) + sizeof(*ev) + req_ie_len;
 554                 ev->cr.resp_ie_len = resp_ie_len;
 555                 memcpy((void *)ev->cr.resp_ie, resp_ie, resp_ie_len);
 556         }
 557         ev->cr.status = status;
 558
 559         spin_lock_irqsave(&wdev->event_lock, flags);
 560         list_add_tail(&ev->list, &wdev->event_list);
 561         spin_unlock_irqrestore(&wdev->event_lock, flags);
 562         queue_work(cfg80211_wq, &rdev->event_work);
 563 }
 564 EXPORT_SYMBOL(cfg80211_connect_result);
 565
 566 void __cfg80211_roamed(struct wireless_dev *wdev,
 567                        struct cfg80211_bss *bss,
 568                        const u8 *req_ie, size_t req_ie_len,
 569                        const u8 *resp_ie, size_t resp_ie_len)
 570 {
 571 #ifdef CONFIG_CFG80211_WEXT
 572         union iwreq_data wrqu;
 573 #endif
 574         ASSERT_WDEV_LOCK(wdev);
 575
 576         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION &&
 577                     wdev->iftype != NL80211_IFTYPE_P2P_CLIENT))
 578                 goto out;
 579
 580         if (wdev->sme_state != CFG80211_SME_CONNECTED)
 581                 goto out;
 582
 583         /* internal error -- how did we get to CONNECTED w/o BSS? */
 584         if (WARN_ON(!wdev->current_bss)) {
 585                 goto out;
 586         }
 587
 588         cfg80211_unhold_bss(wdev->current_bss);
 589         cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
 590         wdev->current_bss = NULL;
 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, bss->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, bss->bssid, ETH_ALEN);
 617         memcpy(wdev->wext.prev_bssid, bss->bssid, ETH_ALEN);
 618         wdev->wext.prev_bssid_valid = true;
 619         wireless_send_event(wdev->netdev, SIOCGIWAP, &wrqu, NULL);
 620 #endif
 621
 622         return;
 623 out:
 624         cfg80211_put_bss(wdev->wiphy, bss);
 625 }
 626
 627 void cfg80211_roamed(struct net_device *dev,
 628                      struct ieee80211_channel *channel,
 629                      const u8 *bssid,
 630                      const u8 *req_ie, size_t req_ie_len,
 631                      const u8 *resp_ie, size_t resp_ie_len, gfp_t gfp)
 632 {
 633         struct wireless_dev *wdev = dev->ieee80211_ptr;
 634         struct cfg80211_bss *bss;
 635
 636         CFG80211_DEV_WARN_ON(wdev->sme_state != CFG80211_SME_CONNECTED);
 637
 638         bss = cfg80211_get_bss(wdev->wiphy, channel, bssid, wdev->ssid,
 639                                wdev->ssid_len, WLAN_CAPABILITY_ESS,
 640                                WLAN_CAPABILITY_ESS);
 641         if (WARN_ON(!bss))
 642                 return;
 643
 644         cfg80211_roamed_bss(dev, bss, req_ie, req_ie_len, resp_ie,
 645                             resp_ie_len, gfp);
 646 }
 647 EXPORT_SYMBOL(cfg80211_roamed);
 648
 649 void cfg80211_roamed_bss(struct net_device *dev,
 650                          struct cfg80211_bss *bss, const u8 *req_ie,
 651                          size_t req_ie_len, const u8 *resp_ie,
 652                          size_t resp_ie_len, gfp_t gfp)
 653 {
 654         struct wireless_dev *wdev = dev->ieee80211_ptr;
 655         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 656         struct cfg80211_event *ev;
 657         unsigned long flags;
 658
 659         CFG80211_DEV_WARN_ON(wdev->sme_state != CFG80211_SME_CONNECTED);
 660
 661         if (WARN_ON(!bss))
 662                 return;
 663
 664         ev = kzalloc(sizeof(*ev) + req_ie_len + resp_ie_len, gfp);
 665         if (!ev) {
 666                 cfg80211_put_bss(wdev->wiphy, bss);
 667                 return;
 668         }
 669
 670         ev->type = EVENT_ROAMED;
 671         ev->rm.req_ie = ((u8 *)ev) + sizeof(*ev);
 672         ev->rm.req_ie_len = req_ie_len;
 673         memcpy((void *)ev->rm.req_ie, req_ie, req_ie_len);
 674         ev->rm.resp_ie = ((u8 *)ev) + sizeof(*ev) + req_ie_len;
 675         ev->rm.resp_ie_len = resp_ie_len;
 676         memcpy((void *)ev->rm.resp_ie, resp_ie, resp_ie_len);
 677         ev->rm.bss = bss;
 678
 679         spin_lock_irqsave(&wdev->event_lock, flags);
 680         list_add_tail(&ev->list, &wdev->event_list);
 681         spin_unlock_irqrestore(&wdev->event_lock, flags);
 682         queue_work(cfg80211_wq, &rdev->event_work);
 683 }
 684 EXPORT_SYMBOL(cfg80211_roamed_bss);
 685
 686 void __cfg80211_disconnected(struct net_device *dev, const u8 *ie,
 687                              size_t ie_len, u16 reason, bool from_ap)
 688 {
 689         struct wireless_dev *wdev = dev->ieee80211_ptr;
 690         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 691         int i;
 692 #ifdef CONFIG_CFG80211_WEXT
 693         union iwreq_data wrqu;
 694 #endif
 695
 696         ASSERT_WDEV_LOCK(wdev);
 697
 698         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION &&
 699                     wdev->iftype != NL80211_IFTYPE_P2P_CLIENT))
 700                 return;
 701
 702         if (wdev->sme_state != CFG80211_SME_CONNECTED)
 703                 return;
 704
 705         if (wdev->current_bss) {
 706                 cfg80211_unhold_bss(wdev->current_bss);
 707                 cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
 708         }
 709
 710         wdev->current_bss = NULL;
 711         wdev->sme_state = CFG80211_SME_IDLE;
 712         wdev->ssid_len = 0;
 713
 714         if (wdev->conn) {
 715                 kfree(wdev->conn->ie);
 716                 wdev->conn->ie = NULL;
 717                 kfree(wdev->conn);
 718                 wdev->conn = NULL;
 719         }
 720
 721         nl80211_send_disconnected(rdev, dev, reason, ie, ie_len, from_ap);
 722
 723         /*
 724          * Delete all the keys ... pairwise keys can't really
 725          * exist any more anyway, but default keys might.
 726          */
 727         if (rdev->ops->del_key)
 728                 for (i = 0; i < 6; i++)
 729                         rdev_del_key(rdev, dev, i, false, NULL);
 730
 731 #ifdef CONFIG_CFG80211_WEXT
 732         memset(&wrqu, 0, sizeof(wrqu));
 733         wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 734         wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL);
 735         wdev->wext.connect.ssid_len = 0;
 736 #endif
 737
 738         schedule_work(&cfg80211_disconnect_work);
 739 }
 740
 741 void cfg80211_disconnected(struct net_device *dev, u16 reason,
 742                            u8 *ie, size_t ie_len, gfp_t gfp)
 743 {
 744         struct wireless_dev *wdev = dev->ieee80211_ptr;
 745         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 746         struct cfg80211_event *ev;
 747         unsigned long flags;
 748
 749         CFG80211_DEV_WARN_ON(wdev->sme_state != CFG80211_SME_CONNECTED);
 750
 751         ev = kzalloc(sizeof(*ev) + ie_len, gfp);
 752         if (!ev)
 753                 return;
 754
 755         ev->type = EVENT_DISCONNECTED;
 756         ev->dc.ie = ((u8 *)ev) + sizeof(*ev);
 757         ev->dc.ie_len = ie_len;
 758         memcpy((void *)ev->dc.ie, ie, ie_len);
 759         ev->dc.reason = reason;
 760
 761         spin_lock_irqsave(&wdev->event_lock, flags);
 762         list_add_tail(&ev->list, &wdev->event_list);
 763         spin_unlock_irqrestore(&wdev->event_lock, flags);
 764         queue_work(cfg80211_wq, &rdev->event_work);
 765 }
 766 EXPORT_SYMBOL(cfg80211_disconnected);
 767
 768 int __cfg80211_connect(struct cfg80211_registered_device *rdev,
 769                        struct net_device *dev,
 770                        struct cfg80211_connect_params *connect,
 771                        struct cfg80211_cached_keys *connkeys,
 772                        const u8 *prev_bssid)
 773 {
 774         struct wireless_dev *wdev = dev->ieee80211_ptr;
 775         struct cfg80211_bss *bss = NULL;
 776         int err;
 777
 778         ASSERT_WDEV_LOCK(wdev);
 779
 780         if (wdev->sme_state != CFG80211_SME_IDLE)
 781                 return -EALREADY;
 782
 783         if (WARN_ON(wdev->connect_keys)) {
 784                 kfree(wdev->connect_keys);
 785                 wdev->connect_keys = NULL;
 786         }
 787
 788         cfg80211_oper_and_ht_capa(&connect->ht_capa_mask,
 789                                   rdev->wiphy.ht_capa_mod_mask);
 790
 791         if (connkeys && connkeys->def >= 0) {
 792                 int idx;
 793                 u32 cipher;
 794
 795                 idx = connkeys->def;
 796                 cipher = connkeys->params[idx].cipher;
 797                 /* If given a WEP key we may need it for shared key auth */
 798                 if (cipher == WLAN_CIPHER_SUITE_WEP40 ||
 799                     cipher == WLAN_CIPHER_SUITE_WEP104) {
 800                         connect->key_idx = idx;
 801                         connect->key = connkeys->params[idx].key;
 802                         connect->key_len = connkeys->params[idx].key_len;
 803
 804                         /*
 805                          * If ciphers are not set (e.g. when going through
 806                          * iwconfig), we have to set them appropriately here.
 807                          */
 808                         if (connect->crypto.cipher_group == 0)
 809                                 connect->crypto.cipher_group = cipher;
 810
 811                         if (connect->crypto.n_ciphers_pairwise == 0) {
 812                                 connect->crypto.n_ciphers_pairwise = 1;
 813                                 connect->crypto.ciphers_pairwise[0] = cipher;
 814                         }
 815                 }
 816         }
 817
 818         if (!rdev->ops->connect) {
 819                 if (!rdev->ops->auth || !rdev->ops->assoc)
 820                         return -EOPNOTSUPP;
 821
 822                 if (WARN_ON(wdev->conn))
 823                         return -EINPROGRESS;
 824
 825                 wdev->conn = kzalloc(sizeof(*wdev->conn), GFP_KERNEL);
 826                 if (!wdev->conn)
 827                         return -ENOMEM;
 828
 829                 /*
 830                  * Copy all parameters, and treat explicitly IEs, BSSID, SSID.
 831                  */
 832                 memcpy(&wdev->conn->params, connect, sizeof(*connect));
 833                 if (connect->bssid) {
 834                         wdev->conn->params.bssid = wdev->conn->bssid;
 835                         memcpy(wdev->conn->bssid, connect->bssid, ETH_ALEN);
 836                 }
 837
 838                 if (connect->ie) {
 839                         wdev->conn->ie = kmemdup(connect->ie, connect->ie_len,
 840                                                 GFP_KERNEL);
 841                         wdev->conn->params.ie = wdev->conn->ie;
 842                         if (!wdev->conn->ie) {
 843                                 kfree(wdev->conn);
 844                                 wdev->conn = NULL;
 845                                 return -ENOMEM;
 846                         }
 847                 }
 848
 849                 if (connect->auth_type == NL80211_AUTHTYPE_AUTOMATIC) {
 850                         wdev->conn->auto_auth = true;
 851                         /* start with open system ... should mostly work */
 852                         wdev->conn->params.auth_type =
 853                                 NL80211_AUTHTYPE_OPEN_SYSTEM;
 854                 } else {
 855                         wdev->conn->auto_auth = false;
 856                 }
 857
 858                 memcpy(wdev->ssid, connect->ssid, connect->ssid_len);
 859                 wdev->ssid_len = connect->ssid_len;
 860                 wdev->conn->params.ssid = wdev->ssid;
 861                 wdev->conn->params.ssid_len = connect->ssid_len;
 862
 863                 /* see if we have the bss already */
 864                 bss = cfg80211_get_conn_bss(wdev);
 865
 866                 wdev->sme_state = CFG80211_SME_CONNECTING;
 867                 wdev->connect_keys = connkeys;
 868
 869                 if (prev_bssid) {
 870                         memcpy(wdev->conn->prev_bssid, prev_bssid, ETH_ALEN);
 871                         wdev->conn->prev_bssid_valid = true;
 872                 }
 873
 874                 /* we're good if we have a matching bss struct */
 875                 if (bss) {
 876                         wdev->conn->state = CFG80211_CONN_AUTHENTICATE_NEXT;
 877                         err = cfg80211_conn_do_work(wdev);
 878                         cfg80211_put_bss(wdev->wiphy, bss);
 879                 } else {
 880                         /* otherwise we'll need to scan for the AP first */
 881                         err = cfg80211_conn_scan(wdev);
 882                         /*
 883                          * If we can't scan right now, then we need to scan again
 884                          * after the current scan finished, since the parameters
 885                          * changed (unless we find a good AP anyway).
 886                          */
 887                         if (err == -EBUSY) {
 888                                 err = 0;
 889                                 wdev->conn->state = CFG80211_CONN_SCAN_AGAIN;
 890                         }
 891                 }
 892                 if (err) {
 893                         kfree(wdev->conn->ie);
 894                         kfree(wdev->conn);
 895                         wdev->conn = NULL;
 896                         wdev->sme_state = CFG80211_SME_IDLE;
 897                         wdev->connect_keys = NULL;
 898                         wdev->ssid_len = 0;
 899                 }
 900
 901                 return err;
 902         } else {
 903                 wdev->sme_state = CFG80211_SME_CONNECTING;
 904                 wdev->connect_keys = connkeys;
 905                 err = rdev_connect(rdev, dev, connect);
 906                 if (err) {
 907                         wdev->connect_keys = NULL;
 908                         wdev->sme_state = CFG80211_SME_IDLE;
 909                         return err;
 910                 }
 911
 912                 memcpy(wdev->ssid, connect->ssid, connect->ssid_len);
 913                 wdev->ssid_len = connect->ssid_len;
 914
 915                 return 0;
 916         }
 917 }
 918
 919 int cfg80211_connect(struct cfg80211_registered_device *rdev,
 920                      struct net_device *dev,
 921                      struct cfg80211_connect_params *connect,
 922                      struct cfg80211_cached_keys *connkeys)
 923 {
 924         int err;
 925
 926         mutex_lock(&rdev->devlist_mtx);
 927         wdev_lock(dev->ieee80211_ptr);
 928         err = __cfg80211_connect(rdev, dev, connect, connkeys, NULL);
 929         wdev_unlock(dev->ieee80211_ptr);
 930         mutex_unlock(&rdev->devlist_mtx);
 931
 932         return err;
 933 }
 934
 935 int __cfg80211_disconnect(struct cfg80211_registered_device *rdev,
 936                           struct net_device *dev, u16 reason, bool wextev)
 937 {
 938         struct wireless_dev *wdev = dev->ieee80211_ptr;
 939         int err;
 940
 941         ASSERT_WDEV_LOCK(wdev);
 942
 943         if (wdev->sme_state == CFG80211_SME_IDLE)
 944                 return -EINVAL;
 945
 946         kfree(wdev->connect_keys);
 947         wdev->connect_keys = NULL;
 948
 949         if (!rdev->ops->disconnect) {
 950                 if (!rdev->ops->deauth)
 951                         return -EOPNOTSUPP;
 952
 953                 /* was it connected by userspace SME? */
 954                 if (!wdev->conn) {
 955                         cfg80211_mlme_down(rdev, dev);
 956                         return 0;
 957                 }
 958
 959                 if (wdev->sme_state == CFG80211_SME_CONNECTING &&
 960                     (wdev->conn->state == CFG80211_CONN_SCANNING ||
 961                      wdev->conn->state == CFG80211_CONN_SCAN_AGAIN)) {
 962                         wdev->sme_state = CFG80211_SME_IDLE;
 963                         kfree(wdev->conn->ie);
 964                         kfree(wdev->conn);
 965                         wdev->conn = NULL;
 966                         wdev->ssid_len = 0;
 967                         return 0;
 968                 }
 969
 970                 /* wdev->conn->params.bssid must be set if > SCANNING */
 971                 err = __cfg80211_mlme_deauth(rdev, dev,
 972                                              wdev->conn->params.bssid,
 973                                              NULL, 0, reason, false);
 974                 if (err)
 975                         return err;
 976         } else {
 977                 err = rdev_disconnect(rdev, dev, reason);
 978                 if (err)
 979                         return err;
 980         }
 981
 982         if (wdev->sme_state == CFG80211_SME_CONNECTED)
 983                 __cfg80211_disconnected(dev, NULL, 0, 0, false);
 984         else if (wdev->sme_state == CFG80211_SME_CONNECTING)
 985                 __cfg80211_connect_result(dev, NULL, NULL, 0, NULL, 0,
 986                                           WLAN_STATUS_UNSPECIFIED_FAILURE,
 987                                           wextev, NULL);
 988
 989         return 0;
 990 }
 991
 992 int cfg80211_disconnect(struct cfg80211_registered_device *rdev,
 993                         struct net_device *dev,
 994                         u16 reason, bool wextev)
 995 {
 996         int err;
 997
 998         wdev_lock(dev->ieee80211_ptr);
 999         err = __cfg80211_disconnect(rdev, dev, reason, wextev);
1000         wdev_unlock(dev->ieee80211_ptr);
1001
1002         return err;
1003 }
1004
1005 void cfg80211_sme_disassoc(struct net_device *dev,
1006                            struct cfg80211_internal_bss *bss)
1007 {
1008         struct wireless_dev *wdev = dev->ieee80211_ptr;
1009         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
1010         u8 bssid[ETH_ALEN];
1011
1012         ASSERT_WDEV_LOCK(wdev);
1013
1014         if (!wdev->conn)
1015                 return;
1016
1017         if (wdev->conn->state == CFG80211_CONN_IDLE)
1018                 return;
1019
1020         /*
1021          * Ok, so the association was made by this SME -- we don't
1022          * want it any more so deauthenticate too.
1023          */
1024
1025         memcpy(bssid, bss->pub.bssid, ETH_ALEN);
1026
1027         __cfg80211_mlme_deauth(rdev, dev, bssid, NULL, 0,
1028                                WLAN_REASON_DEAUTH_LEAVING, false);
1029 }