Pileus Git - ~andy/linux/blob - 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         const u8 *prev_bssid = NULL;
 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                         prev_bssid = wdev->conn->prev_bssid;
 191                 err = __cfg80211_mlme_assoc(rdev, wdev->netdev,
 192                                             params->channel, params->bssid,
 193                                             prev_bssid,
 194                                             params->ssid, params->ssid_len,
 195                                             params->ie, params->ie_len,
 196                                             params->mfp != NL80211_MFP_NO,
 197                                             &params->crypto,
 198                                             params->flags, &params->ht_capa,
 199                                             &params->ht_capa_mask);
 200                 if (err)
 201                         __cfg80211_mlme_deauth(rdev, wdev->netdev, params->bssid,
 202                                                NULL, 0,
 203                                                WLAN_REASON_DEAUTH_LEAVING,
 204                                                false);
 205                 return err;
 206         case CFG80211_CONN_DEAUTH_ASSOC_FAIL:
 207                 __cfg80211_mlme_deauth(rdev, wdev->netdev, params->bssid,
 208                                        NULL, 0,
 209                                        WLAN_REASON_DEAUTH_LEAVING, false);
 210                 /* return an error so that we call __cfg80211_connect_result() */
 211                 return -EINVAL;
 212         default:
 213                 return 0;
 214         }
 215 }
 216
 217 void cfg80211_conn_work(struct work_struct *work)
 218 {
 219         struct cfg80211_registered_device *rdev =
 220                 container_of(work, struct cfg80211_registered_device, conn_work);
 221         struct wireless_dev *wdev;
 222         u8 bssid_buf[ETH_ALEN], *bssid = NULL;
 223
 224         rtnl_lock();
 225         cfg80211_lock_rdev(rdev);
 226         mutex_lock(&rdev->devlist_mtx);
 227         mutex_lock(&rdev->sched_scan_mtx);
 228
 229         list_for_each_entry(wdev, &rdev->wdev_list, list) {
 230                 wdev_lock(wdev);
 231                 if (!netif_running(wdev->netdev)) {
 232                         wdev_unlock(wdev);
 233                         continue;
 234                 }
 235                 if (wdev->sme_state != CFG80211_SME_CONNECTING) {
 236                         wdev_unlock(wdev);
 237                         continue;
 238                 }
 239                 if (wdev->conn->params.bssid) {
 240                         memcpy(bssid_buf, wdev->conn->params.bssid, ETH_ALEN);
 241                         bssid = bssid_buf;
 242                 }
 243                 if (cfg80211_conn_do_work(wdev))
 244                         __cfg80211_connect_result(
 245                                         wdev->netdev, bssid,
 246                                         NULL, 0, NULL, 0,
 247                                         WLAN_STATUS_UNSPECIFIED_FAILURE,
 248                                         false, NULL);
 249                 wdev_unlock(wdev);
 250         }
 251
 252         mutex_unlock(&rdev->sched_scan_mtx);
 253         mutex_unlock(&rdev->devlist_mtx);
 254         cfg80211_unlock_rdev(rdev);
 255         rtnl_unlock();
 256 }
 257
 258 static struct cfg80211_bss *cfg80211_get_conn_bss(struct wireless_dev *wdev)
 259 {
 260         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 261         struct cfg80211_bss *bss;
 262         u16 capa = WLAN_CAPABILITY_ESS;
 263
 264         ASSERT_WDEV_LOCK(wdev);
 265
 266         if (wdev->conn->params.privacy)
 267                 capa |= WLAN_CAPABILITY_PRIVACY;
 268
 269         bss = cfg80211_get_bss(wdev->wiphy, wdev->conn->params.channel,
 270                                wdev->conn->params.bssid,
 271                                wdev->conn->params.ssid,
 272                                wdev->conn->params.ssid_len,
 273                                WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_PRIVACY,
 274                                capa);
 275         if (!bss)
 276                 return NULL;
 277
 278         memcpy(wdev->conn->bssid, bss->bssid, ETH_ALEN);
 279         wdev->conn->params.bssid = wdev->conn->bssid;
 280         wdev->conn->params.channel = bss->channel;
 281         wdev->conn->state = CFG80211_CONN_AUTHENTICATE_NEXT;
 282         schedule_work(&rdev->conn_work);
 283
 284         return bss;
 285 }
 286
 287 static void __cfg80211_sme_scan_done(struct net_device *dev)
 288 {
 289         struct wireless_dev *wdev = dev->ieee80211_ptr;
 290         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 291         struct cfg80211_bss *bss;
 292
 293         ASSERT_WDEV_LOCK(wdev);
 294
 295         if (wdev->sme_state != CFG80211_SME_CONNECTING)
 296                 return;
 297
 298         if (!wdev->conn)
 299                 return;
 300
 301         if (wdev->conn->state != CFG80211_CONN_SCANNING &&
 302             wdev->conn->state != CFG80211_CONN_SCAN_AGAIN)
 303                 return;
 304
 305         bss = cfg80211_get_conn_bss(wdev);
 306         if (bss) {
 307                 cfg80211_put_bss(&rdev->wiphy, bss);
 308         } else {
 309                 /* not found */
 310                 if (wdev->conn->state == CFG80211_CONN_SCAN_AGAIN)
 311                         schedule_work(&rdev->conn_work);
 312                 else
 313                         __cfg80211_connect_result(
 314                                         wdev->netdev,
 315                                         wdev->conn->params.bssid,
 316                                         NULL, 0, NULL, 0,
 317                                         WLAN_STATUS_UNSPECIFIED_FAILURE,
 318                                         false, NULL);
 319         }
 320 }
 321
 322 void cfg80211_sme_scan_done(struct net_device *dev)
 323 {
 324         struct wireless_dev *wdev = dev->ieee80211_ptr;
 325
 326         wdev_lock(wdev);
 327         __cfg80211_sme_scan_done(dev);
 328         wdev_unlock(wdev);
 329 }
 330
 331 void cfg80211_sme_rx_auth(struct net_device *dev,
 332                           const u8 *buf, size_t len)
 333 {
 334         struct wireless_dev *wdev = dev->ieee80211_ptr;
 335         struct wiphy *wiphy = wdev->wiphy;
 336         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 337         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)buf;
 338         u16 status_code = le16_to_cpu(mgmt->u.auth.status_code);
 339
 340         ASSERT_WDEV_LOCK(wdev);
 341
 342         /* should only RX auth frames when connecting */
 343         if (wdev->sme_state != CFG80211_SME_CONNECTING)
 344                 return;
 345
 346         if (WARN_ON(!wdev->conn))
 347                 return;
 348
 349         if (status_code == WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG &&
 350             wdev->conn->auto_auth &&
 351             wdev->conn->params.auth_type != NL80211_AUTHTYPE_NETWORK_EAP) {
 352                 /* select automatically between only open, shared, leap */
 353                 switch (wdev->conn->params.auth_type) {
 354                 case NL80211_AUTHTYPE_OPEN_SYSTEM:
 355                         if (wdev->connect_keys)
 356                                 wdev->conn->params.auth_type =
 357                                         NL80211_AUTHTYPE_SHARED_KEY;
 358                         else
 359                                 wdev->conn->params.auth_type =
 360                                         NL80211_AUTHTYPE_NETWORK_EAP;
 361                         break;
 362                 case NL80211_AUTHTYPE_SHARED_KEY:
 363                         wdev->conn->params.auth_type =
 364                                 NL80211_AUTHTYPE_NETWORK_EAP;
 365                         break;
 366                 default:
 367                         /* huh? */
 368                         wdev->conn->params.auth_type =
 369                                 NL80211_AUTHTYPE_OPEN_SYSTEM;
 370                         break;
 371                 }
 372                 wdev->conn->state = CFG80211_CONN_AUTHENTICATE_NEXT;
 373                 schedule_work(&rdev->conn_work);
 374         } else if (status_code != WLAN_STATUS_SUCCESS) {
 375                 __cfg80211_connect_result(dev, mgmt->bssid, NULL, 0, NULL, 0,
 376                                           status_code, false, NULL);
 377         } else if (wdev->sme_state == CFG80211_SME_CONNECTING &&
 378                  wdev->conn->state == CFG80211_CONN_AUTHENTICATING) {
 379                 wdev->conn->state = CFG80211_CONN_ASSOCIATE_NEXT;
 380                 schedule_work(&rdev->conn_work);
 381         }
 382 }
 383
 384 bool cfg80211_sme_failed_reassoc(struct wireless_dev *wdev)
 385 {
 386         struct wiphy *wiphy = wdev->wiphy;
 387         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 388
 389         if (WARN_ON(!wdev->conn))
 390                 return false;
 391
 392         if (!wdev->conn->prev_bssid_valid)
 393                 return false;
 394
 395         /*
 396          * Some stupid APs don't accept reassoc, so we
 397          * need to fall back to trying regular assoc.
 398          */
 399         wdev->conn->prev_bssid_valid = false;
 400         wdev->conn->state = CFG80211_CONN_ASSOCIATE_NEXT;
 401         schedule_work(&rdev->conn_work);
 402
 403         return true;
 404 }
 405
 406 void cfg80211_sme_failed_assoc(struct wireless_dev *wdev)
 407 {
 408         struct wiphy *wiphy = wdev->wiphy;
 409         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 410
 411         wdev->conn->state = CFG80211_CONN_DEAUTH_ASSOC_FAIL;
 412         schedule_work(&rdev->conn_work);
 413 }
 414
 415 void __cfg80211_connect_result(struct net_device *dev, const u8 *bssid,
 416                                const u8 *req_ie, size_t req_ie_len,
 417                                const u8 *resp_ie, size_t resp_ie_len,
 418                                u16 status, bool wextev,
 419                                struct cfg80211_bss *bss)
 420 {
 421         struct wireless_dev *wdev = dev->ieee80211_ptr;
 422         const u8 *country_ie;
 423 #ifdef CONFIG_CFG80211_WEXT
 424         union iwreq_data wrqu;
 425 #endif
 426
 427         ASSERT_WDEV_LOCK(wdev);
 428
 429         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION &&
 430                     wdev->iftype != NL80211_IFTYPE_P2P_CLIENT))
 431                 return;
 432
 433         if (wdev->sme_state != CFG80211_SME_CONNECTING)
 434                 return;
 435
 436         nl80211_send_connect_result(wiphy_to_dev(wdev->wiphy), dev,
 437                                     bssid, req_ie, req_ie_len,
 438                                     resp_ie, resp_ie_len,
 439                                     status, GFP_KERNEL);
 440
 441 #ifdef CONFIG_CFG80211_WEXT
 442         if (wextev) {
 443                 if (req_ie && status == WLAN_STATUS_SUCCESS) {
 444                         memset(&wrqu, 0, sizeof(wrqu));
 445                         wrqu.data.length = req_ie_len;
 446                         wireless_send_event(dev, IWEVASSOCREQIE, &wrqu, req_ie);
 447                 }
 448
 449                 if (resp_ie && status == WLAN_STATUS_SUCCESS) {
 450                         memset(&wrqu, 0, sizeof(wrqu));
 451                         wrqu.data.length = resp_ie_len;
 452                         wireless_send_event(dev, IWEVASSOCRESPIE, &wrqu, resp_ie);
 453                 }
 454
 455                 memset(&wrqu, 0, sizeof(wrqu));
 456                 wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 457                 if (bssid && status == WLAN_STATUS_SUCCESS) {
 458                         memcpy(wrqu.ap_addr.sa_data, bssid, ETH_ALEN);
 459                         memcpy(wdev->wext.prev_bssid, bssid, ETH_ALEN);
 460                         wdev->wext.prev_bssid_valid = true;
 461                 }
 462                 wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL);
 463         }
 464 #endif
 465
 466         if (wdev->current_bss) {
 467                 cfg80211_unhold_bss(wdev->current_bss);
 468                 cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
 469                 wdev->current_bss = NULL;
 470         }
 471
 472         if (wdev->conn)
 473                 wdev->conn->state = CFG80211_CONN_IDLE;
 474
 475         if (status != WLAN_STATUS_SUCCESS) {
 476                 wdev->sme_state = CFG80211_SME_IDLE;
 477                 if (wdev->conn)
 478                         kfree(wdev->conn->ie);
 479                 kfree(wdev->conn);
 480                 wdev->conn = NULL;
 481                 kfree(wdev->connect_keys);
 482                 wdev->connect_keys = NULL;
 483                 wdev->ssid_len = 0;
 484                 cfg80211_put_bss(wdev->wiphy, bss);
 485                 return;
 486         }
 487
 488         if (!bss)
 489                 bss = cfg80211_get_bss(wdev->wiphy,
 490                                        wdev->conn ? wdev->conn->params.channel :
 491                                        NULL,
 492                                        bssid,
 493                                        wdev->ssid, wdev->ssid_len,
 494                                        WLAN_CAPABILITY_ESS,
 495                                        WLAN_CAPABILITY_ESS);
 496
 497         if (WARN_ON(!bss))
 498                 return;
 499
 500         cfg80211_hold_bss(bss_from_pub(bss));
 501         wdev->current_bss = bss_from_pub(bss);
 502
 503         wdev->sme_state = CFG80211_SME_CONNECTED;
 504         cfg80211_upload_connect_keys(wdev);
 505
 506         rcu_read_lock();
 507         country_ie = ieee80211_bss_get_ie(bss, WLAN_EID_COUNTRY);
 508         if (!country_ie) {
 509                 rcu_read_unlock();
 510                 return;
 511         }
 512
 513         country_ie = kmemdup(country_ie, 2 + country_ie[1], GFP_ATOMIC);
 514         rcu_read_unlock();
 515
 516         if (!country_ie)
 517                 return;
 518
 519         /*
 520          * ieee80211_bss_get_ie() ensures we can access:
 521          * - country_ie + 2, the start of the country ie data, and
 522          * - and country_ie[1] which is the IE length
 523          */
 524         regulatory_hint_11d(wdev->wiphy, bss->channel->band,
 525                             country_ie + 2, 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->wiphy, &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(wdev->wiphy, 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(wdev->wiphy, 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->wiphy, &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(wdev->wiphy, 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         /* might request scan - scan_mtx -> wdev_mtx dependency */
 929         mutex_lock(&rdev->sched_scan_mtx);
 930         wdev_lock(dev->ieee80211_ptr);
 931         err = __cfg80211_connect(rdev, dev, connect, connkeys, NULL);
 932         wdev_unlock(dev->ieee80211_ptr);
 933         mutex_unlock(&rdev->sched_scan_mtx);
 934         mutex_unlock(&rdev->devlist_mtx);
 935
 936         return err;
 937 }
 938
 939 int __cfg80211_disconnect(struct cfg80211_registered_device *rdev,
 940                           struct net_device *dev, u16 reason, bool wextev)
 941 {
 942         struct wireless_dev *wdev = dev->ieee80211_ptr;
 943         int err;
 944
 945         ASSERT_WDEV_LOCK(wdev);
 946
 947         if (wdev->sme_state == CFG80211_SME_IDLE)
 948                 return -EINVAL;
 949
 950         kfree(wdev->connect_keys);
 951         wdev->connect_keys = NULL;
 952
 953         if (!rdev->ops->disconnect) {
 954                 if (!rdev->ops->deauth)
 955                         return -EOPNOTSUPP;
 956
 957                 /* was it connected by userspace SME? */
 958                 if (!wdev->conn) {
 959                         cfg80211_mlme_down(rdev, dev);
 960                         return 0;
 961                 }
 962
 963                 if (wdev->sme_state == CFG80211_SME_CONNECTING &&
 964                     (wdev->conn->state == CFG80211_CONN_SCANNING ||
 965                      wdev->conn->state == CFG80211_CONN_SCAN_AGAIN)) {
 966                         wdev->sme_state = CFG80211_SME_IDLE;
 967                         kfree(wdev->conn->ie);
 968                         kfree(wdev->conn);
 969                         wdev->conn = NULL;
 970                         wdev->ssid_len = 0;
 971                         return 0;
 972                 }
 973
 974                 /* wdev->conn->params.bssid must be set if > SCANNING */
 975                 err = __cfg80211_mlme_deauth(rdev, dev,
 976                                              wdev->conn->params.bssid,
 977                                              NULL, 0, reason, false);
 978                 if (err)
 979                         return err;
 980         } else {
 981                 err = rdev_disconnect(rdev, dev, reason);
 982                 if (err)
 983                         return err;
 984         }
 985
 986         if (wdev->sme_state == CFG80211_SME_CONNECTED)
 987                 __cfg80211_disconnected(dev, NULL, 0, 0, false);
 988         else if (wdev->sme_state == CFG80211_SME_CONNECTING)
 989                 __cfg80211_connect_result(dev, NULL, NULL, 0, NULL, 0,
 990                                           WLAN_STATUS_UNSPECIFIED_FAILURE,
 991                                           wextev, NULL);
 992
 993         return 0;
 994 }
 995
 996 int cfg80211_disconnect(struct cfg80211_registered_device *rdev,
 997                         struct net_device *dev,
 998                         u16 reason, bool wextev)
 999 {
1000         int err;
1001
1002         wdev_lock(dev->ieee80211_ptr);
1003         err = __cfg80211_disconnect(rdev, dev, reason, wextev);
1004         wdev_unlock(dev->ieee80211_ptr);
1005
1006         return err;
1007 }
1008
1009 void cfg80211_sme_disassoc(struct net_device *dev,
1010                            struct cfg80211_internal_bss *bss)
1011 {
1012         struct wireless_dev *wdev = dev->ieee80211_ptr;
1013         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
1014         u8 bssid[ETH_ALEN];
1015
1016         ASSERT_WDEV_LOCK(wdev);
1017
1018         if (!wdev->conn)
1019                 return;
1020
1021         if (wdev->conn->state == CFG80211_CONN_IDLE)
1022                 return;
1023
1024         /*
1025          * Ok, so the association was made by this SME -- we don't
1026          * want it any more so deauthenticate too.
1027          */
1028
1029         memcpy(bssid, bss->pub.bssid, ETH_ALEN);
1030
1031         __cfg80211_mlme_deauth(rdev, dev, bssid, NULL, 0,
1032                                WLAN_REASON_DEAUTH_LEAVING, false);
1033 }