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