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