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         lockdep_assert_held(&rdev->sched_scan_mtx);
  89
  90         if (rdev->scan_req)
  91                 return -EBUSY;
  92
  93         if (wdev->conn->params.channel) {
  94                 n_channels = 1;
  95         } else {
  96                 enum ieee80211_band band;
  97                 n_channels = 0;
  98
  99                 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 100                         if (!wdev->wiphy->bands[band])
 101                                 continue;
 102                         n_channels += wdev->wiphy->bands[band]->n_channels;
 103                 }
 104         }
 105         request = kzalloc(sizeof(*request) + sizeof(request->ssids[0]) +
 106                           sizeof(request->channels[0]) * n_channels,
 107                           GFP_KERNEL);
 108         if (!request)
 109                 return -ENOMEM;
 110
 111         if (wdev->conn->params.channel)
 112                 request->channels[0] = wdev->conn->params.channel;
 113         else {
 114                 int i = 0, j;
 115                 enum ieee80211_band band;
 116                 struct ieee80211_supported_band *bands;
 117                 struct ieee80211_channel *channel;
 118
 119                 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 120                         bands = wdev->wiphy->bands[band];
 121                         if (!bands)
 122                                 continue;
 123                         for (j = 0; j < bands->n_channels; j++) {
 124                                 channel = &bands->channels[j];
 125                                 if (channel->flags & IEEE80211_CHAN_DISABLED)
 126                                         continue;
 127                                 request->channels[i++] = channel;
 128                         }
 129                         request->rates[band] = (1 << bands->n_bitrates) - 1;
 130                 }
 131                 n_channels = i;
 132         }
 133         request->n_channels = n_channels;
 134         request->ssids = (void *)&request->channels[n_channels];
 135         request->n_ssids = 1;
 136
 137         memcpy(request->ssids[0].ssid, wdev->conn->params.ssid,
 138                 wdev->conn->params.ssid_len);
 139         request->ssids[0].ssid_len = wdev->conn->params.ssid_len;
 140
 141         request->wdev = wdev;
 142         request->wiphy = &rdev->wiphy;
 143         request->scan_start = jiffies;
 144
 145         rdev->scan_req = request;
 146
 147         err = rdev_scan(rdev, request);
 148         if (!err) {
 149                 wdev->conn->state = CFG80211_CONN_SCANNING;
 150                 nl80211_send_scan_start(rdev, wdev);
 151                 dev_hold(wdev->netdev);
 152         } else {
 153                 rdev->scan_req = NULL;
 154                 kfree(request);
 155         }
 156         return err;
 157 }
 158
 159 static int cfg80211_conn_do_work(struct wireless_dev *wdev)
 160 {
 161         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 162         struct cfg80211_connect_params *params;
 163         struct cfg80211_assoc_request req = {};
 164         int err;
 165
 166         ASSERT_WDEV_LOCK(wdev);
 167
 168         if (!wdev->conn)
 169                 return 0;
 170
 171         params = &wdev->conn->params;
 172
 173         switch (wdev->conn->state) {
 174         case CFG80211_CONN_SCAN_AGAIN:
 175                 return cfg80211_conn_scan(wdev);
 176         case CFG80211_CONN_AUTHENTICATE_NEXT:
 177                 BUG_ON(!rdev->ops->auth);
 178                 wdev->conn->state = CFG80211_CONN_AUTHENTICATING;
 179                 return __cfg80211_mlme_auth(rdev, wdev->netdev,
 180                                             params->channel, params->auth_type,
 181                                             params->bssid,
 182                                             params->ssid, params->ssid_len,
 183                                             NULL, 0,
 184                                             params->key, params->key_len,
 185                                             params->key_idx, NULL, 0);
 186         case CFG80211_CONN_ASSOCIATE_NEXT:
 187                 BUG_ON(!rdev->ops->assoc);
 188                 wdev->conn->state = CFG80211_CONN_ASSOCIATING;
 189                 if (wdev->conn->prev_bssid_valid)
 190                         req.prev_bssid = wdev->conn->prev_bssid;
 191                 req.ie = params->ie;
 192                 req.ie_len = params->ie_len;
 193                 req.use_mfp = params->mfp != NL80211_MFP_NO;
 194                 req.crypto = params->crypto;
 195                 req.flags = params->flags;
 196                 req.ht_capa = params->ht_capa;
 197                 req.ht_capa_mask = params->ht_capa_mask;
 198                 req.vht_capa = params->vht_capa;
 199                 req.vht_capa_mask = params->vht_capa_mask;
 200
 201                 err = __cfg80211_mlme_assoc(rdev, wdev->netdev, params->channel,
 202                                             params->bssid, params->ssid,
 203                                             params->ssid_len, &req);
 204                 if (err)
 205                         __cfg80211_mlme_deauth(rdev, wdev->netdev, params->bssid,
 206                                                NULL, 0,
 207                                                WLAN_REASON_DEAUTH_LEAVING,
 208                                                false);
 209                 return err;
 210         case CFG80211_CONN_DEAUTH_ASSOC_FAIL:
 211                 __cfg80211_mlme_deauth(rdev, wdev->netdev, params->bssid,
 212                                        NULL, 0,
 213                                        WLAN_REASON_DEAUTH_LEAVING, false);
 214                 /* return an error so that we call __cfg80211_connect_result() */
 215                 return -EINVAL;
 216         default:
 217                 return 0;
 218         }
 219 }
 220
 221 void cfg80211_conn_work(struct work_struct *work)
 222 {
 223         struct cfg80211_registered_device *rdev =
 224                 container_of(work, struct cfg80211_registered_device, conn_work);
 225         struct wireless_dev *wdev;
 226         u8 bssid_buf[ETH_ALEN], *bssid = NULL;
 227
 228         rtnl_lock();
 229         cfg80211_lock_rdev(rdev);
 230         mutex_lock(&rdev->devlist_mtx);
 231         mutex_lock(&rdev->sched_scan_mtx);
 232
 233         list_for_each_entry(wdev, &rdev->wdev_list, list) {
 234                 if (!wdev->netdev)
 235                         continue;
 236
 237                 wdev_lock(wdev);
 238                 if (!netif_running(wdev->netdev)) {
 239                         wdev_unlock(wdev);
 240                         continue;
 241                 }
 242                 if (wdev->sme_state != CFG80211_SME_CONNECTING || !wdev->conn) {
 243                         wdev_unlock(wdev);
 244                         continue;
 245                 }
 246                 if (wdev->conn->params.bssid) {
 247                         memcpy(bssid_buf, wdev->conn->params.bssid, ETH_ALEN);
 248                         bssid = bssid_buf;
 249                 }
 250                 if (cfg80211_conn_do_work(wdev))
 251                         __cfg80211_connect_result(
 252                                         wdev->netdev, bssid,
 253                                         NULL, 0, NULL, 0,
 254                                         WLAN_STATUS_UNSPECIFIED_FAILURE,
 255                                         false, NULL);
 256                 wdev_unlock(wdev);
 257         }
 258
 259         mutex_unlock(&rdev->sched_scan_mtx);
 260         mutex_unlock(&rdev->devlist_mtx);
 261         cfg80211_unlock_rdev(rdev);
 262         rtnl_unlock();
 263 }
 264
 265 static struct cfg80211_bss *cfg80211_get_conn_bss(struct wireless_dev *wdev)
 266 {
 267         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 268         struct cfg80211_bss *bss;
 269         u16 capa = WLAN_CAPABILITY_ESS;
 270
 271         ASSERT_WDEV_LOCK(wdev);
 272
 273         if (wdev->conn->params.privacy)
 274                 capa |= WLAN_CAPABILITY_PRIVACY;
 275
 276         bss = cfg80211_get_bss(wdev->wiphy, wdev->conn->params.channel,
 277                                wdev->conn->params.bssid,
 278                                wdev->conn->params.ssid,
 279                                wdev->conn->params.ssid_len,
 280                                WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_PRIVACY,
 281                                capa);
 282         if (!bss)
 283                 return NULL;
 284
 285         memcpy(wdev->conn->bssid, bss->bssid, ETH_ALEN);
 286         wdev->conn->params.bssid = wdev->conn->bssid;
 287         wdev->conn->params.channel = bss->channel;
 288         wdev->conn->state = CFG80211_CONN_AUTHENTICATE_NEXT;
 289         schedule_work(&rdev->conn_work);
 290
 291         return bss;
 292 }
 293
 294 static void __cfg80211_sme_scan_done(struct net_device *dev)
 295 {
 296         struct wireless_dev *wdev = dev->ieee80211_ptr;
 297         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 298         struct cfg80211_bss *bss;
 299
 300         ASSERT_WDEV_LOCK(wdev);
 301
 302         if (wdev->sme_state != CFG80211_SME_CONNECTING)
 303                 return;
 304
 305         if (!wdev->conn)
 306                 return;
 307
 308         if (wdev->conn->state != CFG80211_CONN_SCANNING &&
 309             wdev->conn->state != CFG80211_CONN_SCAN_AGAIN)
 310                 return;
 311
 312         bss = cfg80211_get_conn_bss(wdev);
 313         if (bss) {
 314                 cfg80211_put_bss(&rdev->wiphy, bss);
 315         } else {
 316                 /* not found */
 317                 if (wdev->conn->state == CFG80211_CONN_SCAN_AGAIN)
 318                         schedule_work(&rdev->conn_work);
 319                 else
 320                         __cfg80211_connect_result(
 321                                         wdev->netdev,
 322                                         wdev->conn->params.bssid,
 323                                         NULL, 0, NULL, 0,
 324                                         WLAN_STATUS_UNSPECIFIED_FAILURE,
 325                                         false, NULL);
 326         }
 327 }
 328
 329 void cfg80211_sme_scan_done(struct net_device *dev)
 330 {
 331         struct wireless_dev *wdev = dev->ieee80211_ptr;
 332
 333         wdev_lock(wdev);
 334         __cfg80211_sme_scan_done(dev);
 335         wdev_unlock(wdev);
 336 }
 337
 338 void cfg80211_sme_rx_auth(struct net_device *dev,
 339                           const u8 *buf, size_t len)
 340 {
 341         struct wireless_dev *wdev = dev->ieee80211_ptr;
 342         struct wiphy *wiphy = wdev->wiphy;
 343         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 344         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)buf;
 345         u16 status_code = le16_to_cpu(mgmt->u.auth.status_code);
 346
 347         ASSERT_WDEV_LOCK(wdev);
 348
 349         /* should only RX auth frames when connecting */
 350         if (wdev->sme_state != CFG80211_SME_CONNECTING)
 351                 return;
 352
 353         if (WARN_ON(!wdev->conn))
 354                 return;
 355
 356         if (status_code == WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG &&
 357             wdev->conn->auto_auth &&
 358             wdev->conn->params.auth_type != NL80211_AUTHTYPE_NETWORK_EAP) {
 359                 /* select automatically between only open, shared, leap */
 360                 switch (wdev->conn->params.auth_type) {
 361                 case NL80211_AUTHTYPE_OPEN_SYSTEM:
 362                         if (wdev->connect_keys)
 363                                 wdev->conn->params.auth_type =
 364                                         NL80211_AUTHTYPE_SHARED_KEY;
 365                         else
 366                                 wdev->conn->params.auth_type =
 367                                         NL80211_AUTHTYPE_NETWORK_EAP;
 368                         break;
 369                 case NL80211_AUTHTYPE_SHARED_KEY:
 370                         wdev->conn->params.auth_type =
 371                                 NL80211_AUTHTYPE_NETWORK_EAP;
 372                         break;
 373                 default:
 374                         /* huh? */
 375                         wdev->conn->params.auth_type =
 376                                 NL80211_AUTHTYPE_OPEN_SYSTEM;
 377                         break;
 378                 }
 379                 wdev->conn->state = CFG80211_CONN_AUTHENTICATE_NEXT;
 380                 schedule_work(&rdev->conn_work);
 381         } else if (status_code != WLAN_STATUS_SUCCESS) {
 382                 __cfg80211_connect_result(dev, mgmt->bssid, NULL, 0, NULL, 0,
 383                                           status_code, false, NULL);
 384         } else if (wdev->sme_state == CFG80211_SME_CONNECTING &&
 385                  wdev->conn->state == CFG80211_CONN_AUTHENTICATING) {
 386                 wdev->conn->state = CFG80211_CONN_ASSOCIATE_NEXT;
 387                 schedule_work(&rdev->conn_work);
 388         }
 389 }
 390
 391 bool cfg80211_sme_failed_reassoc(struct wireless_dev *wdev)
 392 {
 393         struct wiphy *wiphy = wdev->wiphy;
 394         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 395
 396         if (WARN_ON(!wdev->conn))
 397                 return false;
 398
 399         if (!wdev->conn->prev_bssid_valid)
 400                 return false;
 401
 402         /*
 403          * Some stupid APs don't accept reassoc, so we
 404          * need to fall back to trying regular assoc.
 405          */
 406         wdev->conn->prev_bssid_valid = false;
 407         wdev->conn->state = CFG80211_CONN_ASSOCIATE_NEXT;
 408         schedule_work(&rdev->conn_work);
 409
 410         return true;
 411 }
 412
 413 void cfg80211_sme_failed_assoc(struct wireless_dev *wdev)
 414 {
 415         struct wiphy *wiphy = wdev->wiphy;
 416         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 417
 418         wdev->conn->state = CFG80211_CONN_DEAUTH_ASSOC_FAIL;
 419         schedule_work(&rdev->conn_work);
 420 }
 421
 422 void __cfg80211_connect_result(struct net_device *dev, const u8 *bssid,
 423                                const u8 *req_ie, size_t req_ie_len,
 424                                const u8 *resp_ie, size_t resp_ie_len,
 425                                u16 status, bool wextev,
 426                                struct cfg80211_bss *bss)
 427 {
 428         struct wireless_dev *wdev = dev->ieee80211_ptr;
 429         const u8 *country_ie;
 430 #ifdef CONFIG_CFG80211_WEXT
 431         union iwreq_data wrqu;
 432 #endif
 433
 434         ASSERT_WDEV_LOCK(wdev);
 435
 436         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION &&
 437                     wdev->iftype != NL80211_IFTYPE_P2P_CLIENT))
 438                 return;
 439
 440         if (wdev->sme_state != CFG80211_SME_CONNECTING)
 441                 return;
 442
 443         nl80211_send_connect_result(wiphy_to_dev(wdev->wiphy), dev,
 444                                     bssid, req_ie, req_ie_len,
 445                                     resp_ie, resp_ie_len,
 446                                     status, GFP_KERNEL);
 447
 448 #ifdef CONFIG_CFG80211_WEXT
 449         if (wextev) {
 450                 if (req_ie && status == WLAN_STATUS_SUCCESS) {
 451                         memset(&wrqu, 0, sizeof(wrqu));
 452                         wrqu.data.length = req_ie_len;
 453                         wireless_send_event(dev, IWEVASSOCREQIE, &wrqu, req_ie);
 454                 }
 455
 456                 if (resp_ie && status == WLAN_STATUS_SUCCESS) {
 457                         memset(&wrqu, 0, sizeof(wrqu));
 458                         wrqu.data.length = resp_ie_len;
 459                         wireless_send_event(dev, IWEVASSOCRESPIE, &wrqu, resp_ie);
 460                 }
 461
 462                 memset(&wrqu, 0, sizeof(wrqu));
 463                 wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 464                 if (bssid && status == WLAN_STATUS_SUCCESS) {
 465                         memcpy(wrqu.ap_addr.sa_data, bssid, ETH_ALEN);
 466                         memcpy(wdev->wext.prev_bssid, bssid, ETH_ALEN);
 467                         wdev->wext.prev_bssid_valid = true;
 468                 }
 469                 wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL);
 470         }
 471 #endif
 472
 473         if (wdev->current_bss) {
 474                 cfg80211_unhold_bss(wdev->current_bss);
 475                 cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
 476                 wdev->current_bss = NULL;
 477         }
 478
 479         if (wdev->conn)
 480                 wdev->conn->state = CFG80211_CONN_IDLE;
 481
 482         if (status != WLAN_STATUS_SUCCESS) {
 483                 wdev->sme_state = CFG80211_SME_IDLE;
 484                 if (wdev->conn)
 485                         kfree(wdev->conn->ie);
 486                 kfree(wdev->conn);
 487                 wdev->conn = NULL;
 488                 kfree(wdev->connect_keys);
 489                 wdev->connect_keys = NULL;
 490                 wdev->ssid_len = 0;
 491                 cfg80211_put_bss(wdev->wiphy, bss);
 492                 return;
 493         }
 494
 495         if (!bss)
 496                 bss = cfg80211_get_bss(wdev->wiphy,
 497                                        wdev->conn ? wdev->conn->params.channel :
 498                                        NULL,
 499                                        bssid,
 500                                        wdev->ssid, wdev->ssid_len,
 501                                        WLAN_CAPABILITY_ESS,
 502                                        WLAN_CAPABILITY_ESS);
 503
 504         if (WARN_ON(!bss))
 505                 return;
 506
 507         cfg80211_hold_bss(bss_from_pub(bss));
 508         wdev->current_bss = bss_from_pub(bss);
 509
 510         wdev->sme_state = CFG80211_SME_CONNECTED;
 511         cfg80211_upload_connect_keys(wdev);
 512
 513         rcu_read_lock();
 514         country_ie = ieee80211_bss_get_ie(bss, WLAN_EID_COUNTRY);
 515         if (!country_ie) {
 516                 rcu_read_unlock();
 517                 return;
 518         }
 519
 520         country_ie = kmemdup(country_ie, 2 + country_ie[1], GFP_ATOMIC);
 521         rcu_read_unlock();
 522
 523         if (!country_ie)
 524                 return;
 525
 526         /*
 527          * ieee80211_bss_get_ie() ensures we can access:
 528          * - country_ie + 2, the start of the country ie data, and
 529          * - and country_ie[1] which is the IE length
 530          */
 531         regulatory_hint_11d(wdev->wiphy, bss->channel->band,
 532                             country_ie + 2, country_ie[1]);
 533         kfree(country_ie);
 534 }
 535
 536 void cfg80211_connect_result(struct net_device *dev, const u8 *bssid,
 537                              const u8 *req_ie, size_t req_ie_len,
 538                              const u8 *resp_ie, size_t resp_ie_len,
 539                              u16 status, gfp_t gfp)
 540 {
 541         struct wireless_dev *wdev = dev->ieee80211_ptr;
 542         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 543         struct cfg80211_event *ev;
 544         unsigned long flags;
 545
 546         CFG80211_DEV_WARN_ON(wdev->sme_state != CFG80211_SME_CONNECTING);
 547
 548         ev = kzalloc(sizeof(*ev) + req_ie_len + resp_ie_len, gfp);
 549         if (!ev)
 550                 return;
 551
 552         ev->type = EVENT_CONNECT_RESULT;
 553         if (bssid)
 554                 memcpy(ev->cr.bssid, bssid, ETH_ALEN);
 555         if (req_ie_len) {
 556                 ev->cr.req_ie = ((u8 *)ev) + sizeof(*ev);
 557                 ev->cr.req_ie_len = req_ie_len;
 558                 memcpy((void *)ev->cr.req_ie, req_ie, req_ie_len);
 559         }
 560         if (resp_ie_len) {
 561                 ev->cr.resp_ie = ((u8 *)ev) + sizeof(*ev) + req_ie_len;
 562                 ev->cr.resp_ie_len = resp_ie_len;
 563                 memcpy((void *)ev->cr.resp_ie, resp_ie, resp_ie_len);
 564         }
 565         ev->cr.status = status;
 566
 567         spin_lock_irqsave(&wdev->event_lock, flags);
 568         list_add_tail(&ev->list, &wdev->event_list);
 569         spin_unlock_irqrestore(&wdev->event_lock, flags);
 570         queue_work(cfg80211_wq, &rdev->event_work);
 571 }
 572 EXPORT_SYMBOL(cfg80211_connect_result);
 573
 574 void __cfg80211_roamed(struct wireless_dev *wdev,
 575                        struct cfg80211_bss *bss,
 576                        const u8 *req_ie, size_t req_ie_len,
 577                        const u8 *resp_ie, size_t resp_ie_len)
 578 {
 579 #ifdef CONFIG_CFG80211_WEXT
 580         union iwreq_data wrqu;
 581 #endif
 582         ASSERT_WDEV_LOCK(wdev);
 583
 584         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION &&
 585                     wdev->iftype != NL80211_IFTYPE_P2P_CLIENT))
 586                 goto out;
 587
 588         if (wdev->sme_state != CFG80211_SME_CONNECTED)
 589                 goto out;
 590
 591         /* internal error -- how did we get to CONNECTED w/o BSS? */
 592         if (WARN_ON(!wdev->current_bss)) {
 593                 goto out;
 594         }
 595
 596         cfg80211_unhold_bss(wdev->current_bss);
 597         cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
 598         wdev->current_bss = NULL;
 599
 600         cfg80211_hold_bss(bss_from_pub(bss));
 601         wdev->current_bss = bss_from_pub(bss);
 602
 603         nl80211_send_roamed(wiphy_to_dev(wdev->wiphy), wdev->netdev, bss->bssid,
 604                             req_ie, req_ie_len, resp_ie, resp_ie_len,
 605                             GFP_KERNEL);
 606
 607 #ifdef CONFIG_CFG80211_WEXT
 608         if (req_ie) {
 609                 memset(&wrqu, 0, sizeof(wrqu));
 610                 wrqu.data.length = req_ie_len;
 611                 wireless_send_event(wdev->netdev, IWEVASSOCREQIE,
 612                                     &wrqu, req_ie);
 613         }
 614
 615         if (resp_ie) {
 616                 memset(&wrqu, 0, sizeof(wrqu));
 617                 wrqu.data.length = resp_ie_len;
 618                 wireless_send_event(wdev->netdev, IWEVASSOCRESPIE,
 619                                     &wrqu, resp_ie);
 620         }
 621
 622         memset(&wrqu, 0, sizeof(wrqu));
 623         wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 624         memcpy(wrqu.ap_addr.sa_data, bss->bssid, ETH_ALEN);
 625         memcpy(wdev->wext.prev_bssid, bss->bssid, ETH_ALEN);
 626         wdev->wext.prev_bssid_valid = true;
 627         wireless_send_event(wdev->netdev, SIOCGIWAP, &wrqu, NULL);
 628 #endif
 629
 630         return;
 631 out:
 632         cfg80211_put_bss(wdev->wiphy, bss);
 633 }
 634
 635 void cfg80211_roamed(struct net_device *dev,
 636                      struct ieee80211_channel *channel,
 637                      const u8 *bssid,
 638                      const u8 *req_ie, size_t req_ie_len,
 639                      const u8 *resp_ie, size_t resp_ie_len, gfp_t gfp)
 640 {
 641         struct wireless_dev *wdev = dev->ieee80211_ptr;
 642         struct cfg80211_bss *bss;
 643
 644         CFG80211_DEV_WARN_ON(wdev->sme_state != CFG80211_SME_CONNECTED);
 645
 646         bss = cfg80211_get_bss(wdev->wiphy, channel, bssid, wdev->ssid,
 647                                wdev->ssid_len, WLAN_CAPABILITY_ESS,
 648                                WLAN_CAPABILITY_ESS);
 649         if (WARN_ON(!bss))
 650                 return;
 651
 652         cfg80211_roamed_bss(dev, bss, req_ie, req_ie_len, resp_ie,
 653                             resp_ie_len, gfp);
 654 }
 655 EXPORT_SYMBOL(cfg80211_roamed);
 656
 657 void cfg80211_roamed_bss(struct net_device *dev,
 658                          struct cfg80211_bss *bss, const u8 *req_ie,
 659                          size_t req_ie_len, const u8 *resp_ie,
 660                          size_t resp_ie_len, gfp_t gfp)
 661 {
 662         struct wireless_dev *wdev = dev->ieee80211_ptr;
 663         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 664         struct cfg80211_event *ev;
 665         unsigned long flags;
 666
 667         CFG80211_DEV_WARN_ON(wdev->sme_state != CFG80211_SME_CONNECTED);
 668
 669         if (WARN_ON(!bss))
 670                 return;
 671
 672         ev = kzalloc(sizeof(*ev) + req_ie_len + resp_ie_len, gfp);
 673         if (!ev) {
 674                 cfg80211_put_bss(wdev->wiphy, bss);
 675                 return;
 676         }
 677
 678         ev->type = EVENT_ROAMED;
 679         ev->rm.req_ie = ((u8 *)ev) + sizeof(*ev);
 680         ev->rm.req_ie_len = req_ie_len;
 681         memcpy((void *)ev->rm.req_ie, req_ie, req_ie_len);
 682         ev->rm.resp_ie = ((u8 *)ev) + sizeof(*ev) + req_ie_len;
 683         ev->rm.resp_ie_len = resp_ie_len;
 684         memcpy((void *)ev->rm.resp_ie, resp_ie, resp_ie_len);
 685         ev->rm.bss = bss;
 686
 687         spin_lock_irqsave(&wdev->event_lock, flags);
 688         list_add_tail(&ev->list, &wdev->event_list);
 689         spin_unlock_irqrestore(&wdev->event_lock, flags);
 690         queue_work(cfg80211_wq, &rdev->event_work);
 691 }
 692 EXPORT_SYMBOL(cfg80211_roamed_bss);
 693
 694 void __cfg80211_disconnected(struct net_device *dev, const u8 *ie,
 695                              size_t ie_len, u16 reason, bool from_ap)
 696 {
 697         struct wireless_dev *wdev = dev->ieee80211_ptr;
 698         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 699         int i;
 700 #ifdef CONFIG_CFG80211_WEXT
 701         union iwreq_data wrqu;
 702 #endif
 703
 704         ASSERT_WDEV_LOCK(wdev);
 705
 706         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION &&
 707                     wdev->iftype != NL80211_IFTYPE_P2P_CLIENT))
 708                 return;
 709
 710         if (wdev->sme_state != CFG80211_SME_CONNECTED)
 711                 return;
 712
 713         if (wdev->current_bss) {
 714                 cfg80211_unhold_bss(wdev->current_bss);
 715                 cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
 716         }
 717
 718         wdev->current_bss = NULL;
 719         wdev->sme_state = CFG80211_SME_IDLE;
 720         wdev->ssid_len = 0;
 721
 722         if (wdev->conn) {
 723                 kfree(wdev->conn->ie);
 724                 wdev->conn->ie = NULL;
 725                 kfree(wdev->conn);
 726                 wdev->conn = NULL;
 727         }
 728
 729         nl80211_send_disconnected(rdev, dev, reason, ie, ie_len, from_ap);
 730
 731         /*
 732          * Delete all the keys ... pairwise keys can't really
 733          * exist any more anyway, but default keys might.
 734          */
 735         if (rdev->ops->del_key)
 736                 for (i = 0; i < 6; i++)
 737                         rdev_del_key(rdev, dev, i, false, NULL);
 738
 739 #ifdef CONFIG_CFG80211_WEXT
 740         memset(&wrqu, 0, sizeof(wrqu));
 741         wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 742         wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL);
 743         wdev->wext.connect.ssid_len = 0;
 744 #endif
 745
 746         schedule_work(&cfg80211_disconnect_work);
 747 }
 748
 749 void cfg80211_disconnected(struct net_device *dev, u16 reason,
 750                            u8 *ie, size_t ie_len, gfp_t gfp)
 751 {
 752         struct wireless_dev *wdev = dev->ieee80211_ptr;
 753         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 754         struct cfg80211_event *ev;
 755         unsigned long flags;
 756
 757         CFG80211_DEV_WARN_ON(wdev->sme_state != CFG80211_SME_CONNECTED);
 758
 759         ev = kzalloc(sizeof(*ev) + ie_len, gfp);
 760         if (!ev)
 761                 return;
 762
 763         ev->type = EVENT_DISCONNECTED;
 764         ev->dc.ie = ((u8 *)ev) + sizeof(*ev);
 765         ev->dc.ie_len = ie_len;
 766         memcpy((void *)ev->dc.ie, ie, ie_len);
 767         ev->dc.reason = reason;
 768
 769         spin_lock_irqsave(&wdev->event_lock, flags);
 770         list_add_tail(&ev->list, &wdev->event_list);
 771         spin_unlock_irqrestore(&wdev->event_lock, flags);
 772         queue_work(cfg80211_wq, &rdev->event_work);
 773 }
 774 EXPORT_SYMBOL(cfg80211_disconnected);
 775
 776 int __cfg80211_connect(struct cfg80211_registered_device *rdev,
 777                        struct net_device *dev,
 778                        struct cfg80211_connect_params *connect,
 779                        struct cfg80211_cached_keys *connkeys,
 780                        const u8 *prev_bssid)
 781 {
 782         struct wireless_dev *wdev = dev->ieee80211_ptr;
 783         struct cfg80211_bss *bss = NULL;
 784         int err;
 785
 786         ASSERT_WDEV_LOCK(wdev);
 787
 788         if (wdev->sme_state != CFG80211_SME_IDLE)
 789                 return -EALREADY;
 790
 791         if (WARN_ON(wdev->connect_keys)) {
 792                 kfree(wdev->connect_keys);
 793                 wdev->connect_keys = NULL;
 794         }
 795
 796         cfg80211_oper_and_ht_capa(&connect->ht_capa_mask,
 797                                   rdev->wiphy.ht_capa_mod_mask);
 798
 799         if (connkeys && connkeys->def >= 0) {
 800                 int idx;
 801                 u32 cipher;
 802
 803                 idx = connkeys->def;
 804                 cipher = connkeys->params[idx].cipher;
 805                 /* If given a WEP key we may need it for shared key auth */
 806                 if (cipher == WLAN_CIPHER_SUITE_WEP40 ||
 807                     cipher == WLAN_CIPHER_SUITE_WEP104) {
 808                         connect->key_idx = idx;
 809                         connect->key = connkeys->params[idx].key;
 810                         connect->key_len = connkeys->params[idx].key_len;
 811
 812                         /*
 813                          * If ciphers are not set (e.g. when going through
 814                          * iwconfig), we have to set them appropriately here.
 815                          */
 816                         if (connect->crypto.cipher_group == 0)
 817                                 connect->crypto.cipher_group = cipher;
 818
 819                         if (connect->crypto.n_ciphers_pairwise == 0) {
 820                                 connect->crypto.n_ciphers_pairwise = 1;
 821                                 connect->crypto.ciphers_pairwise[0] = cipher;
 822                         }
 823                 }
 824         }
 825
 826         if (!rdev->ops->connect) {
 827                 if (!rdev->ops->auth || !rdev->ops->assoc)
 828                         return -EOPNOTSUPP;
 829
 830                 if (WARN_ON(wdev->conn))
 831                         return -EINPROGRESS;
 832
 833                 wdev->conn = kzalloc(sizeof(*wdev->conn), GFP_KERNEL);
 834                 if (!wdev->conn)
 835                         return -ENOMEM;
 836
 837                 /*
 838                  * Copy all parameters, and treat explicitly IEs, BSSID, SSID.
 839                  */
 840                 memcpy(&wdev->conn->params, connect, sizeof(*connect));
 841                 if (connect->bssid) {
 842                         wdev->conn->params.bssid = wdev->conn->bssid;
 843                         memcpy(wdev->conn->bssid, connect->bssid, ETH_ALEN);
 844                 }
 845
 846                 if (connect->ie) {
 847                         wdev->conn->ie = kmemdup(connect->ie, connect->ie_len,
 848                                                 GFP_KERNEL);
 849                         wdev->conn->params.ie = wdev->conn->ie;
 850                         if (!wdev->conn->ie) {
 851                                 kfree(wdev->conn);
 852                                 wdev->conn = NULL;
 853                                 return -ENOMEM;
 854                         }
 855                 }
 856
 857                 if (connect->auth_type == NL80211_AUTHTYPE_AUTOMATIC) {
 858                         wdev->conn->auto_auth = true;
 859                         /* start with open system ... should mostly work */
 860                         wdev->conn->params.auth_type =
 861                                 NL80211_AUTHTYPE_OPEN_SYSTEM;
 862                 } else {
 863                         wdev->conn->auto_auth = false;
 864                 }
 865
 866                 memcpy(wdev->ssid, connect->ssid, connect->ssid_len);
 867                 wdev->ssid_len = connect->ssid_len;
 868                 wdev->conn->params.ssid = wdev->ssid;
 869                 wdev->conn->params.ssid_len = connect->ssid_len;
 870
 871                 /* see if we have the bss already */
 872                 bss = cfg80211_get_conn_bss(wdev);
 873
 874                 wdev->sme_state = CFG80211_SME_CONNECTING;
 875                 wdev->connect_keys = connkeys;
 876
 877                 if (prev_bssid) {
 878                         memcpy(wdev->conn->prev_bssid, prev_bssid, ETH_ALEN);
 879                         wdev->conn->prev_bssid_valid = true;
 880                 }
 881
 882                 /* we're good if we have a matching bss struct */
 883                 if (bss) {
 884                         wdev->conn->state = CFG80211_CONN_AUTHENTICATE_NEXT;
 885                         err = cfg80211_conn_do_work(wdev);
 886                         cfg80211_put_bss(wdev->wiphy, bss);
 887                 } else {
 888                         /* otherwise we'll need to scan for the AP first */
 889                         err = cfg80211_conn_scan(wdev);
 890                         /*
 891                          * If we can't scan right now, then we need to scan again
 892                          * after the current scan finished, since the parameters
 893                          * changed (unless we find a good AP anyway).
 894                          */
 895                         if (err == -EBUSY) {
 896                                 err = 0;
 897                                 wdev->conn->state = CFG80211_CONN_SCAN_AGAIN;
 898                         }
 899                 }
 900                 if (err) {
 901                         kfree(wdev->conn->ie);
 902                         kfree(wdev->conn);
 903                         wdev->conn = NULL;
 904                         wdev->sme_state = CFG80211_SME_IDLE;
 905                         wdev->connect_keys = NULL;
 906                         wdev->ssid_len = 0;
 907                 }
 908
 909                 return err;
 910         } else {
 911                 wdev->sme_state = CFG80211_SME_CONNECTING;
 912                 wdev->connect_keys = connkeys;
 913                 err = rdev_connect(rdev, dev, connect);
 914                 if (err) {
 915                         wdev->connect_keys = NULL;
 916                         wdev->sme_state = CFG80211_SME_IDLE;
 917                         return err;
 918                 }
 919
 920                 memcpy(wdev->ssid, connect->ssid, connect->ssid_len);
 921                 wdev->ssid_len = connect->ssid_len;
 922
 923                 return 0;
 924         }
 925 }
 926
 927 int cfg80211_connect(struct cfg80211_registered_device *rdev,
 928                      struct net_device *dev,
 929                      struct cfg80211_connect_params *connect,
 930                      struct cfg80211_cached_keys *connkeys)
 931 {
 932         int err;
 933
 934         mutex_lock(&rdev->devlist_mtx);
 935         /* might request scan - scan_mtx -> wdev_mtx dependency */
 936         mutex_lock(&rdev->sched_scan_mtx);
 937         wdev_lock(dev->ieee80211_ptr);
 938         err = __cfg80211_connect(rdev, dev, connect, connkeys, NULL);
 939         wdev_unlock(dev->ieee80211_ptr);
 940         mutex_unlock(&rdev->sched_scan_mtx);
 941         mutex_unlock(&rdev->devlist_mtx);
 942
 943         return err;
 944 }
 945
 946 int __cfg80211_disconnect(struct cfg80211_registered_device *rdev,
 947                           struct net_device *dev, u16 reason, bool wextev)
 948 {
 949         struct wireless_dev *wdev = dev->ieee80211_ptr;
 950         int err;
 951
 952         ASSERT_WDEV_LOCK(wdev);
 953
 954         if (wdev->sme_state == CFG80211_SME_IDLE)
 955                 return -EINVAL;
 956
 957         kfree(wdev->connect_keys);
 958         wdev->connect_keys = NULL;
 959
 960         if (!rdev->ops->disconnect) {
 961                 if (!rdev->ops->deauth)
 962                         return -EOPNOTSUPP;
 963
 964                 /* was it connected by userspace SME? */
 965                 if (!wdev->conn) {
 966                         cfg80211_mlme_down(rdev, dev);
 967                         goto disconnect;
 968                 }
 969
 970                 if (wdev->sme_state == CFG80211_SME_CONNECTING &&
 971                     (wdev->conn->state == CFG80211_CONN_SCANNING ||
 972                      wdev->conn->state == CFG80211_CONN_SCAN_AGAIN)) {
 973                         wdev->sme_state = CFG80211_SME_IDLE;
 974                         kfree(wdev->conn->ie);
 975                         kfree(wdev->conn);
 976                         wdev->conn = NULL;
 977                         wdev->ssid_len = 0;
 978                         return 0;
 979                 }
 980
 981                 /* wdev->conn->params.bssid must be set if > SCANNING */
 982                 err = __cfg80211_mlme_deauth(rdev, dev,
 983                                              wdev->conn->params.bssid,
 984                                              NULL, 0, reason, false);
 985                 if (err)
 986                         return err;
 987         } else {
 988                 err = rdev_disconnect(rdev, dev, reason);
 989                 if (err)
 990                         return err;
 991         }
 992
 993  disconnect:
 994         if (wdev->sme_state == CFG80211_SME_CONNECTED)
 995                 __cfg80211_disconnected(dev, NULL, 0, 0, false);
 996         else if (wdev->sme_state == CFG80211_SME_CONNECTING)
 997                 __cfg80211_connect_result(dev, NULL, NULL, 0, NULL, 0,
 998                                           WLAN_STATUS_UNSPECIFIED_FAILURE,
 999                                           wextev, NULL);
1000
1001         return 0;
1002 }
1003
1004 int cfg80211_disconnect(struct cfg80211_registered_device *rdev,
1005                         struct net_device *dev,
1006                         u16 reason, bool wextev)
1007 {
1008         int err;
1009
1010         wdev_lock(dev->ieee80211_ptr);
1011         err = __cfg80211_disconnect(rdev, dev, reason, wextev);
1012         wdev_unlock(dev->ieee80211_ptr);
1013
1014         return err;
1015 }
1016
1017 void cfg80211_sme_disassoc(struct net_device *dev,
1018                            struct cfg80211_internal_bss *bss)
1019 {
1020         struct wireless_dev *wdev = dev->ieee80211_ptr;
1021         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
1022         u8 bssid[ETH_ALEN];
1023
1024         ASSERT_WDEV_LOCK(wdev);
1025
1026         if (!wdev->conn)
1027                 return;
1028
1029         if (wdev->conn->state == CFG80211_CONN_IDLE)
1030                 return;
1031
1032         /*
1033          * Ok, so the association was made by this SME -- we don't
1034          * want it any more so deauthenticate too.
1035          */
1036
1037         memcpy(bssid, bss->pub.bssid, ETH_ALEN);
1038
1039         __cfg80211_mlme_deauth(rdev, dev, bssid, NULL, 0,
1040                                WLAN_REASON_DEAUTH_LEAVING, false);
1041 }