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
  20 struct cfg80211_conn {
  21         struct cfg80211_connect_params params;
  22         /* these are sub-states of the _CONNECTING sme_state */
  23         enum {
  24                 CFG80211_CONN_IDLE,
  25                 CFG80211_CONN_SCANNING,
  26                 CFG80211_CONN_SCAN_AGAIN,
  27                 CFG80211_CONN_AUTHENTICATE_NEXT,
  28                 CFG80211_CONN_AUTHENTICATING,
  29                 CFG80211_CONN_ASSOCIATE_NEXT,
  30                 CFG80211_CONN_ASSOCIATING,
  31                 CFG80211_CONN_DEAUTH_ASSOC_FAIL,
  32         } state;
  33         u8 bssid[ETH_ALEN], prev_bssid[ETH_ALEN];
  34         u8 *ie;
  35         size_t ie_len;
  36         bool auto_auth, prev_bssid_valid;
  37 };
  38
  39 static bool cfg80211_is_all_idle(void)
  40 {
  41         struct cfg80211_registered_device *rdev;
  42         struct wireless_dev *wdev;
  43         bool is_all_idle = true;
  44
  45         mutex_lock(&cfg80211_mutex);
  46
  47         /*
  48          * All devices must be idle as otherwise if you are actively
  49          * scanning some new beacon hints could be learned and would
  50          * count as new regulatory hints.
  51          */
  52         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
  53                 cfg80211_lock_rdev(rdev);
  54                 list_for_each_entry(wdev, &rdev->netdev_list, list) {
  55                         wdev_lock(wdev);
  56                         if (wdev->sme_state != CFG80211_SME_IDLE)
  57                                 is_all_idle = false;
  58                         wdev_unlock(wdev);
  59                 }
  60                 cfg80211_unlock_rdev(rdev);
  61         }
  62
  63         mutex_unlock(&cfg80211_mutex);
  64
  65         return is_all_idle;
  66 }
  67
  68 static void disconnect_work(struct work_struct *work)
  69 {
  70         if (!cfg80211_is_all_idle())
  71                 return;
  72
  73         regulatory_hint_disconnect();
  74 }
  75
  76 static DECLARE_WORK(cfg80211_disconnect_work, disconnect_work);
  77
  78 static int cfg80211_conn_scan(struct wireless_dev *wdev)
  79 {
  80         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
  81         struct cfg80211_scan_request *request;
  82         int n_channels, err;
  83
  84         ASSERT_RTNL();
  85         ASSERT_RDEV_LOCK(rdev);
  86         ASSERT_WDEV_LOCK(wdev);
  87
  88         if (rdev->scan_req)
  89                 return -EBUSY;
  90
  91         if (wdev->conn->params.channel) {
  92                 n_channels = 1;
  93         } else {
  94                 enum ieee80211_band band;
  95                 n_channels = 0;
  96
  97                 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
  98                         if (!wdev->wiphy->bands[band])
  99                                 continue;
 100                         n_channels += wdev->wiphy->bands[band]->n_channels;
 101                 }
 102         }
 103         request = kzalloc(sizeof(*request) + sizeof(request->ssids[0]) +
 104                           sizeof(request->channels[0]) * n_channels,
 105                           GFP_KERNEL);
 106         if (!request)
 107                 return -ENOMEM;
 108
 109         if (wdev->conn->params.channel)
 110                 request->channels[0] = wdev->conn->params.channel;
 111         else {
 112                 int i = 0, j;
 113                 enum ieee80211_band band;
 114                 struct ieee80211_supported_band *bands;
 115                 struct ieee80211_channel *channel;
 116
 117                 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 118                         bands = wdev->wiphy->bands[band];
 119                         if (!bands)
 120                                 continue;
 121                         for (j = 0; j < bands->n_channels; j++) {
 122                                 channel = &bands->channels[j];
 123                                 if (channel->flags & IEEE80211_CHAN_DISABLED)
 124                                         continue;
 125                                 request->channels[i++] = channel;
 126                         }
 127                         request->rates[band] = (1 << bands->n_bitrates) - 1;
 128                 }
 129                 n_channels = i;
 130         }
 131         request->n_channels = n_channels;
 132         request->ssids = (void *)&request->channels[n_channels];
 133         request->n_ssids = 1;
 134
 135         memcpy(request->ssids[0].ssid, wdev->conn->params.ssid,
 136                 wdev->conn->params.ssid_len);
 137         request->ssids[0].ssid_len = wdev->conn->params.ssid_len;
 138
 139         request->dev = wdev->netdev;
 140         request->wiphy = &rdev->wiphy;
 141
 142         rdev->scan_req = request;
 143
 144         err = rdev->ops->scan(wdev->wiphy, wdev->netdev, request);
 145         if (!err) {
 146                 wdev->conn->state = CFG80211_CONN_SCANNING;
 147                 nl80211_send_scan_start(rdev, wdev->netdev);
 148                 dev_hold(wdev->netdev);
 149         } else {
 150                 rdev->scan_req = NULL;
 151                 kfree(request);
 152         }
 153         return err;
 154 }
 155
 156 static int cfg80211_conn_do_work(struct wireless_dev *wdev)
 157 {
 158         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 159         struct cfg80211_connect_params *params;
 160         const u8 *prev_bssid = NULL;
 161         int err;
 162
 163         ASSERT_WDEV_LOCK(wdev);
 164
 165         if (!wdev->conn)
 166                 return 0;
 167
 168         params = &wdev->conn->params;
 169
 170         switch (wdev->conn->state) {
 171         case CFG80211_CONN_SCAN_AGAIN:
 172                 return cfg80211_conn_scan(wdev);
 173         case CFG80211_CONN_AUTHENTICATE_NEXT:
 174                 BUG_ON(!rdev->ops->auth);
 175                 wdev->conn->state = CFG80211_CONN_AUTHENTICATING;
 176                 return __cfg80211_mlme_auth(rdev, wdev->netdev,
 177                                             params->channel, params->auth_type,
 178                                             params->bssid,
 179                                             params->ssid, params->ssid_len,
 180                                             NULL, 0,
 181                                             params->key, params->key_len,
 182                                             params->key_idx, false);
 183         case CFG80211_CONN_ASSOCIATE_NEXT:
 184                 BUG_ON(!rdev->ops->assoc);
 185                 wdev->conn->state = CFG80211_CONN_ASSOCIATING;
 186                 if (wdev->conn->prev_bssid_valid)
 187                         prev_bssid = wdev->conn->prev_bssid;
 188                 err = __cfg80211_mlme_assoc(rdev, wdev->netdev,
 189                                             params->channel, params->bssid,
 190                                             prev_bssid,
 191                                             params->ssid, params->ssid_len,
 192                                             params->ie, params->ie_len,
 193                                             false, &params->crypto);
 194                 if (err)
 195                         __cfg80211_mlme_deauth(rdev, wdev->netdev, params->bssid,
 196                                                NULL, 0,
 197                                                WLAN_REASON_DEAUTH_LEAVING,
 198                                                false);
 199                 return err;
 200         case CFG80211_CONN_DEAUTH_ASSOC_FAIL:
 201                 __cfg80211_mlme_deauth(rdev, wdev->netdev, params->bssid,
 202                                        NULL, 0,
 203                                        WLAN_REASON_DEAUTH_LEAVING, false);
 204                 /* return an error so that we call __cfg80211_connect_result() */
 205                 return -EINVAL;
 206         default:
 207                 return 0;
 208         }
 209 }
 210
 211 void cfg80211_conn_work(struct work_struct *work)
 212 {
 213         struct cfg80211_registered_device *rdev =
 214                 container_of(work, struct cfg80211_registered_device, conn_work);
 215         struct wireless_dev *wdev;
 216         u8 bssid_buf[ETH_ALEN], *bssid = NULL;
 217
 218         rtnl_lock();
 219         cfg80211_lock_rdev(rdev);
 220         mutex_lock(&rdev->devlist_mtx);
 221
 222         list_for_each_entry(wdev, &rdev->netdev_list, list) {
 223                 wdev_lock(wdev);
 224                 if (!netif_running(wdev->netdev)) {
 225                         wdev_unlock(wdev);
 226                         continue;
 227                 }
 228                 if (wdev->sme_state != CFG80211_SME_CONNECTING) {
 229                         wdev_unlock(wdev);
 230                         continue;
 231                 }
 232                 if (wdev->conn->params.bssid) {
 233                         memcpy(bssid_buf, wdev->conn->params.bssid, ETH_ALEN);
 234                         bssid = bssid_buf;
 235                 }
 236                 if (cfg80211_conn_do_work(wdev))
 237                         __cfg80211_connect_result(
 238                                         wdev->netdev, bssid,
 239                                         NULL, 0, NULL, 0,
 240                                         WLAN_STATUS_UNSPECIFIED_FAILURE,
 241                                         false, NULL);
 242                 wdev_unlock(wdev);
 243         }
 244
 245         mutex_unlock(&rdev->devlist_mtx);
 246         cfg80211_unlock_rdev(rdev);
 247         rtnl_unlock();
 248 }
 249
 250 static struct cfg80211_bss *cfg80211_get_conn_bss(struct wireless_dev *wdev)
 251 {
 252         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 253         struct cfg80211_bss *bss;
 254         u16 capa = WLAN_CAPABILITY_ESS;
 255
 256         ASSERT_WDEV_LOCK(wdev);
 257
 258         if (wdev->conn->params.privacy)
 259                 capa |= WLAN_CAPABILITY_PRIVACY;
 260
 261         bss = cfg80211_get_bss(wdev->wiphy, wdev->conn->params.channel,
 262                                wdev->conn->params.bssid,
 263                                wdev->conn->params.ssid,
 264                                wdev->conn->params.ssid_len,
 265                                WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_PRIVACY,
 266                                capa);
 267         if (!bss)
 268                 return NULL;
 269
 270         memcpy(wdev->conn->bssid, bss->bssid, ETH_ALEN);
 271         wdev->conn->params.bssid = wdev->conn->bssid;
 272         wdev->conn->params.channel = bss->channel;
 273         wdev->conn->state = CFG80211_CONN_AUTHENTICATE_NEXT;
 274         schedule_work(&rdev->conn_work);
 275
 276         return bss;
 277 }
 278
 279 static void __cfg80211_sme_scan_done(struct net_device *dev)
 280 {
 281         struct wireless_dev *wdev = dev->ieee80211_ptr;
 282         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 283         struct cfg80211_bss *bss;
 284
 285         ASSERT_WDEV_LOCK(wdev);
 286
 287         if (wdev->sme_state != CFG80211_SME_CONNECTING)
 288                 return;
 289
 290         if (!wdev->conn)
 291                 return;
 292
 293         if (wdev->conn->state != CFG80211_CONN_SCANNING &&
 294             wdev->conn->state != CFG80211_CONN_SCAN_AGAIN)
 295                 return;
 296
 297         bss = cfg80211_get_conn_bss(wdev);
 298         if (bss) {
 299                 cfg80211_put_bss(bss);
 300         } else {
 301                 /* not found */
 302                 if (wdev->conn->state == CFG80211_CONN_SCAN_AGAIN)
 303                         schedule_work(&rdev->conn_work);
 304                 else
 305                         __cfg80211_connect_result(
 306                                         wdev->netdev,
 307                                         wdev->conn->params.bssid,
 308                                         NULL, 0, NULL, 0,
 309                                         WLAN_STATUS_UNSPECIFIED_FAILURE,
 310                                         false, NULL);
 311         }
 312 }
 313
 314 void cfg80211_sme_scan_done(struct net_device *dev)
 315 {
 316         struct wireless_dev *wdev = dev->ieee80211_ptr;
 317
 318         mutex_lock(&wiphy_to_dev(wdev->wiphy)->devlist_mtx);
 319         wdev_lock(wdev);
 320         __cfg80211_sme_scan_done(dev);
 321         wdev_unlock(wdev);
 322         mutex_unlock(&wiphy_to_dev(wdev->wiphy)->devlist_mtx);
 323 }
 324
 325 void cfg80211_sme_rx_auth(struct net_device *dev,
 326                           const u8 *buf, size_t len)
 327 {
 328         struct wireless_dev *wdev = dev->ieee80211_ptr;
 329         struct wiphy *wiphy = wdev->wiphy;
 330         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 331         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)buf;
 332         u16 status_code = le16_to_cpu(mgmt->u.auth.status_code);
 333
 334         ASSERT_WDEV_LOCK(wdev);
 335
 336         /* should only RX auth frames when connecting */
 337         if (wdev->sme_state != CFG80211_SME_CONNECTING)
 338                 return;
 339
 340         if (WARN_ON(!wdev->conn))
 341                 return;
 342
 343         if (status_code == WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG &&
 344             wdev->conn->auto_auth &&
 345             wdev->conn->params.auth_type != NL80211_AUTHTYPE_NETWORK_EAP) {
 346                 /* select automatically between only open, shared, leap */
 347                 switch (wdev->conn->params.auth_type) {
 348                 case NL80211_AUTHTYPE_OPEN_SYSTEM:
 349                         if (wdev->connect_keys)
 350                                 wdev->conn->params.auth_type =
 351                                         NL80211_AUTHTYPE_SHARED_KEY;
 352                         else
 353                                 wdev->conn->params.auth_type =
 354                                         NL80211_AUTHTYPE_NETWORK_EAP;
 355                         break;
 356                 case NL80211_AUTHTYPE_SHARED_KEY:
 357                         wdev->conn->params.auth_type =
 358                                 NL80211_AUTHTYPE_NETWORK_EAP;
 359                         break;
 360                 default:
 361                         /* huh? */
 362                         wdev->conn->params.auth_type =
 363                                 NL80211_AUTHTYPE_OPEN_SYSTEM;
 364                         break;
 365                 }
 366                 wdev->conn->state = CFG80211_CONN_AUTHENTICATE_NEXT;
 367                 schedule_work(&rdev->conn_work);
 368         } else if (status_code != WLAN_STATUS_SUCCESS) {
 369                 __cfg80211_connect_result(dev, mgmt->bssid, NULL, 0, NULL, 0,
 370                                           status_code, false, NULL);
 371         } else if (wdev->sme_state == CFG80211_SME_CONNECTING &&
 372                  wdev->conn->state == CFG80211_CONN_AUTHENTICATING) {
 373                 wdev->conn->state = CFG80211_CONN_ASSOCIATE_NEXT;
 374                 schedule_work(&rdev->conn_work);
 375         }
 376 }
 377
 378 bool cfg80211_sme_failed_reassoc(struct wireless_dev *wdev)
 379 {
 380         struct wiphy *wiphy = wdev->wiphy;
 381         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 382
 383         if (WARN_ON(!wdev->conn))
 384                 return false;
 385
 386         if (!wdev->conn->prev_bssid_valid)
 387                 return false;
 388
 389         /*
 390          * Some stupid APs don't accept reassoc, so we
 391          * need to fall back to trying regular assoc.
 392          */
 393         wdev->conn->prev_bssid_valid = false;
 394         wdev->conn->state = CFG80211_CONN_ASSOCIATE_NEXT;
 395         schedule_work(&rdev->conn_work);
 396
 397         return true;
 398 }
 399
 400 void cfg80211_sme_failed_assoc(struct wireless_dev *wdev)
 401 {
 402         struct wiphy *wiphy = wdev->wiphy;
 403         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 404
 405         wdev->conn->state = CFG80211_CONN_DEAUTH_ASSOC_FAIL;
 406         schedule_work(&rdev->conn_work);
 407 }
 408
 409 void __cfg80211_connect_result(struct net_device *dev, const u8 *bssid,
 410                                const u8 *req_ie, size_t req_ie_len,
 411                                const u8 *resp_ie, size_t resp_ie_len,
 412                                u16 status, bool wextev,
 413                                struct cfg80211_bss *bss)
 414 {
 415         struct wireless_dev *wdev = dev->ieee80211_ptr;
 416         u8 *country_ie;
 417 #ifdef CONFIG_CFG80211_WEXT
 418         union iwreq_data wrqu;
 419 #endif
 420
 421         ASSERT_WDEV_LOCK(wdev);
 422
 423         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION &&
 424                     wdev->iftype != NL80211_IFTYPE_P2P_CLIENT))
 425                 return;
 426
 427         if (wdev->sme_state != CFG80211_SME_CONNECTING)
 428                 return;
 429
 430         nl80211_send_connect_result(wiphy_to_dev(wdev->wiphy), dev,
 431                                     bssid, req_ie, req_ie_len,
 432                                     resp_ie, resp_ie_len,
 433                                     status, GFP_KERNEL);
 434
 435 #ifdef CONFIG_CFG80211_WEXT
 436         if (wextev) {
 437                 if (req_ie && status == WLAN_STATUS_SUCCESS) {
 438                         memset(&wrqu, 0, sizeof(wrqu));
 439                         wrqu.data.length = req_ie_len;
 440                         wireless_send_event(dev, IWEVASSOCREQIE, &wrqu, req_ie);
 441                 }
 442
 443                 if (resp_ie && status == WLAN_STATUS_SUCCESS) {
 444                         memset(&wrqu, 0, sizeof(wrqu));
 445                         wrqu.data.length = resp_ie_len;
 446                         wireless_send_event(dev, IWEVASSOCRESPIE, &wrqu, resp_ie);
 447                 }
 448
 449                 memset(&wrqu, 0, sizeof(wrqu));
 450                 wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 451                 if (bssid && status == WLAN_STATUS_SUCCESS) {
 452                         memcpy(wrqu.ap_addr.sa_data, bssid, ETH_ALEN);
 453                         memcpy(wdev->wext.prev_bssid, bssid, ETH_ALEN);
 454                         wdev->wext.prev_bssid_valid = true;
 455                 }
 456                 wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL);
 457         }
 458 #endif
 459
 460         if (wdev->current_bss) {
 461                 cfg80211_unhold_bss(wdev->current_bss);
 462                 cfg80211_put_bss(&wdev->current_bss->pub);
 463                 wdev->current_bss = NULL;
 464         }
 465
 466         if (wdev->conn)
 467                 wdev->conn->state = CFG80211_CONN_IDLE;
 468
 469         if (status != WLAN_STATUS_SUCCESS) {
 470                 wdev->sme_state = CFG80211_SME_IDLE;
 471                 if (wdev->conn)
 472                         kfree(wdev->conn->ie);
 473                 kfree(wdev->conn);
 474                 wdev->conn = NULL;
 475                 kfree(wdev->connect_keys);
 476                 wdev->connect_keys = NULL;
 477                 wdev->ssid_len = 0;
 478                 return;
 479         }
 480
 481         if (!bss)
 482                 bss = cfg80211_get_bss(wdev->wiphy,
 483                                        wdev->conn ? wdev->conn->params.channel :
 484                                        NULL,
 485                                        bssid,
 486                                        wdev->ssid, wdev->ssid_len,
 487                                        WLAN_CAPABILITY_ESS,
 488                                        WLAN_CAPABILITY_ESS);
 489
 490         if (WARN_ON(!bss))
 491                 return;
 492
 493         cfg80211_hold_bss(bss_from_pub(bss));
 494         wdev->current_bss = bss_from_pub(bss);
 495
 496         wdev->sme_state = CFG80211_SME_CONNECTED;
 497         cfg80211_upload_connect_keys(wdev);
 498
 499         country_ie = (u8 *) ieee80211_bss_get_ie(bss, WLAN_EID_COUNTRY);
 500
 501         if (!country_ie)
 502                 return;
 503
 504         /*
 505          * ieee80211_bss_get_ie() ensures we can access:
 506          * - country_ie + 2, the start of the country ie data, and
 507          * - and country_ie[1] which is the IE length
 508          */
 509         regulatory_hint_11d(wdev->wiphy,
 510                             bss->channel->band,
 511                             country_ie + 2,
 512                             country_ie[1]);
 513 }
 514
 515 void cfg80211_connect_result(struct net_device *dev, const u8 *bssid,
 516                              const u8 *req_ie, size_t req_ie_len,
 517                              const u8 *resp_ie, size_t resp_ie_len,
 518                              u16 status, gfp_t gfp)
 519 {
 520         struct wireless_dev *wdev = dev->ieee80211_ptr;
 521         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 522         struct cfg80211_event *ev;
 523         unsigned long flags;
 524
 525         CFG80211_DEV_WARN_ON(wdev->sme_state != CFG80211_SME_CONNECTING);
 526
 527         ev = kzalloc(sizeof(*ev) + req_ie_len + resp_ie_len, gfp);
 528         if (!ev)
 529                 return;
 530
 531         ev->type = EVENT_CONNECT_RESULT;
 532         if (bssid)
 533                 memcpy(ev->cr.bssid, bssid, ETH_ALEN);
 534         if (req_ie_len) {
 535                 ev->cr.req_ie = ((u8 *)ev) + sizeof(*ev);
 536                 ev->cr.req_ie_len = req_ie_len;
 537                 memcpy((void *)ev->cr.req_ie, req_ie, req_ie_len);
 538         }
 539         if (resp_ie_len) {
 540                 ev->cr.resp_ie = ((u8 *)ev) + sizeof(*ev) + req_ie_len;
 541                 ev->cr.resp_ie_len = resp_ie_len;
 542                 memcpy((void *)ev->cr.resp_ie, resp_ie, resp_ie_len);
 543         }
 544         ev->cr.status = status;
 545
 546         spin_lock_irqsave(&wdev->event_lock, flags);
 547         list_add_tail(&ev->list, &wdev->event_list);
 548         spin_unlock_irqrestore(&wdev->event_lock, flags);
 549         queue_work(cfg80211_wq, &rdev->event_work);
 550 }
 551 EXPORT_SYMBOL(cfg80211_connect_result);
 552
 553 void __cfg80211_roamed(struct wireless_dev *wdev,
 554                        struct ieee80211_channel *channel,
 555                        const u8 *bssid,
 556                        const u8 *req_ie, size_t req_ie_len,
 557                        const u8 *resp_ie, size_t resp_ie_len)
 558 {
 559         struct cfg80211_bss *bss;
 560 #ifdef CONFIG_CFG80211_WEXT
 561         union iwreq_data wrqu;
 562 #endif
 563
 564         ASSERT_WDEV_LOCK(wdev);
 565
 566         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION &&
 567                     wdev->iftype != NL80211_IFTYPE_P2P_CLIENT))
 568                 return;
 569
 570         if (wdev->sme_state != CFG80211_SME_CONNECTED)
 571                 return;
 572
 573         /* internal error -- how did we get to CONNECTED w/o BSS? */
 574         if (WARN_ON(!wdev->current_bss)) {
 575                 return;
 576         }
 577
 578         cfg80211_unhold_bss(wdev->current_bss);
 579         cfg80211_put_bss(&wdev->current_bss->pub);
 580         wdev->current_bss = NULL;
 581
 582         bss = cfg80211_get_bss(wdev->wiphy, channel, bssid,
 583                                wdev->ssid, wdev->ssid_len,
 584                                WLAN_CAPABILITY_ESS, WLAN_CAPABILITY_ESS);
 585
 586         if (WARN_ON(!bss))
 587                 return;
 588
 589         cfg80211_hold_bss(bss_from_pub(bss));
 590         wdev->current_bss = bss_from_pub(bss);
 591
 592         nl80211_send_roamed(wiphy_to_dev(wdev->wiphy), wdev->netdev, bssid,
 593                             req_ie, req_ie_len, resp_ie, resp_ie_len,
 594                             GFP_KERNEL);
 595
 596 #ifdef CONFIG_CFG80211_WEXT
 597         if (req_ie) {
 598                 memset(&wrqu, 0, sizeof(wrqu));
 599                 wrqu.data.length = req_ie_len;
 600                 wireless_send_event(wdev->netdev, IWEVASSOCREQIE,
 601                                     &wrqu, req_ie);
 602         }
 603
 604         if (resp_ie) {
 605                 memset(&wrqu, 0, sizeof(wrqu));
 606                 wrqu.data.length = resp_ie_len;
 607                 wireless_send_event(wdev->netdev, IWEVASSOCRESPIE,
 608                                     &wrqu, resp_ie);
 609         }
 610
 611         memset(&wrqu, 0, sizeof(wrqu));
 612         wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 613         memcpy(wrqu.ap_addr.sa_data, bssid, ETH_ALEN);
 614         memcpy(wdev->wext.prev_bssid, bssid, ETH_ALEN);
 615         wdev->wext.prev_bssid_valid = true;
 616         wireless_send_event(wdev->netdev, SIOCGIWAP, &wrqu, NULL);
 617 #endif
 618 }
 619
 620 void cfg80211_roamed(struct net_device *dev,
 621                      struct ieee80211_channel *channel,
 622                      const u8 *bssid,
 623                      const u8 *req_ie, size_t req_ie_len,
 624                      const u8 *resp_ie, size_t resp_ie_len, gfp_t gfp)
 625 {
 626         struct wireless_dev *wdev = dev->ieee80211_ptr;
 627         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 628         struct cfg80211_event *ev;
 629         unsigned long flags;
 630
 631         CFG80211_DEV_WARN_ON(wdev->sme_state != CFG80211_SME_CONNECTED);
 632
 633         ev = kzalloc(sizeof(*ev) + req_ie_len + resp_ie_len, gfp);
 634         if (!ev)
 635                 return;
 636
 637         ev->type = EVENT_ROAMED;
 638         ev->rm.channel = channel;
 639         memcpy(ev->rm.bssid, bssid, ETH_ALEN);
 640         ev->rm.req_ie = ((u8 *)ev) + sizeof(*ev);
 641         ev->rm.req_ie_len = req_ie_len;
 642         memcpy((void *)ev->rm.req_ie, req_ie, req_ie_len);
 643         ev->rm.resp_ie = ((u8 *)ev) + sizeof(*ev) + req_ie_len;
 644         ev->rm.resp_ie_len = resp_ie_len;
 645         memcpy((void *)ev->rm.resp_ie, resp_ie, resp_ie_len);
 646
 647         spin_lock_irqsave(&wdev->event_lock, flags);
 648         list_add_tail(&ev->list, &wdev->event_list);
 649         spin_unlock_irqrestore(&wdev->event_lock, flags);
 650         queue_work(cfg80211_wq, &rdev->event_work);
 651 }
 652 EXPORT_SYMBOL(cfg80211_roamed);
 653
 654 void __cfg80211_disconnected(struct net_device *dev, const u8 *ie,
 655                              size_t ie_len, u16 reason, bool from_ap)
 656 {
 657         struct wireless_dev *wdev = dev->ieee80211_ptr;
 658         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 659         int i;
 660 #ifdef CONFIG_CFG80211_WEXT
 661         union iwreq_data wrqu;
 662 #endif
 663
 664         ASSERT_WDEV_LOCK(wdev);
 665
 666         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION &&
 667                     wdev->iftype != NL80211_IFTYPE_P2P_CLIENT))
 668                 return;
 669
 670         if (wdev->sme_state != CFG80211_SME_CONNECTED)
 671                 return;
 672
 673         if (wdev->current_bss) {
 674                 cfg80211_unhold_bss(wdev->current_bss);
 675                 cfg80211_put_bss(&wdev->current_bss->pub);
 676         }
 677
 678         wdev->current_bss = NULL;
 679         wdev->sme_state = CFG80211_SME_IDLE;
 680         wdev->ssid_len = 0;
 681
 682         if (wdev->conn) {
 683                 const u8 *bssid;
 684                 int ret;
 685
 686                 kfree(wdev->conn->ie);
 687                 wdev->conn->ie = NULL;
 688                 kfree(wdev->conn);
 689                 wdev->conn = NULL;
 690
 691                 /*
 692                  * If this disconnect was due to a disassoc, we
 693                  * we might still have an auth BSS around. For
 694                  * the userspace SME that's currently expected,
 695                  * but for the kernel SME (nl80211 CONNECT or
 696                  * wireless extensions) we want to clear up all
 697                  * state.
 698                  */
 699                 for (i = 0; i < MAX_AUTH_BSSES; i++) {
 700                         if (!wdev->auth_bsses[i])
 701                                 continue;
 702                         bssid = wdev->auth_bsses[i]->pub.bssid;
 703                         ret = __cfg80211_mlme_deauth(rdev, dev, bssid, NULL, 0,
 704                                                 WLAN_REASON_DEAUTH_LEAVING,
 705                                                 false);
 706                         WARN(ret, "deauth failed: %d\n", ret);
 707                 }
 708         }
 709
 710         nl80211_send_disconnected(rdev, dev, reason, ie, ie_len, from_ap);
 711
 712         /*
 713          * Delete all the keys ... pairwise keys can't really
 714          * exist any more anyway, but default keys might.
 715          */
 716         if (rdev->ops->del_key)
 717                 for (i = 0; i < 6; i++)
 718                         rdev->ops->del_key(wdev->wiphy, dev, i, false, NULL);
 719
 720 #ifdef CONFIG_CFG80211_WEXT
 721         memset(&wrqu, 0, sizeof(wrqu));
 722         wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 723         wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL);
 724         wdev->wext.connect.ssid_len = 0;
 725 #endif
 726
 727         schedule_work(&cfg80211_disconnect_work);
 728 }
 729
 730 void cfg80211_disconnected(struct net_device *dev, u16 reason,
 731                            u8 *ie, size_t ie_len, gfp_t gfp)
 732 {
 733         struct wireless_dev *wdev = dev->ieee80211_ptr;
 734         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 735         struct cfg80211_event *ev;
 736         unsigned long flags;
 737
 738         CFG80211_DEV_WARN_ON(wdev->sme_state != CFG80211_SME_CONNECTED);
 739
 740         ev = kzalloc(sizeof(*ev) + ie_len, gfp);
 741         if (!ev)
 742                 return;
 743
 744         ev->type = EVENT_DISCONNECTED;
 745         ev->dc.ie = ((u8 *)ev) + sizeof(*ev);
 746         ev->dc.ie_len = ie_len;
 747         memcpy((void *)ev->dc.ie, ie, ie_len);
 748         ev->dc.reason = reason;
 749
 750         spin_lock_irqsave(&wdev->event_lock, flags);
 751         list_add_tail(&ev->list, &wdev->event_list);
 752         spin_unlock_irqrestore(&wdev->event_lock, flags);
 753         queue_work(cfg80211_wq, &rdev->event_work);
 754 }
 755 EXPORT_SYMBOL(cfg80211_disconnected);
 756
 757 int __cfg80211_connect(struct cfg80211_registered_device *rdev,
 758                        struct net_device *dev,
 759                        struct cfg80211_connect_params *connect,
 760                        struct cfg80211_cached_keys *connkeys,
 761                        const u8 *prev_bssid)
 762 {
 763         struct wireless_dev *wdev = dev->ieee80211_ptr;
 764         struct cfg80211_bss *bss = NULL;
 765         int err;
 766
 767         ASSERT_WDEV_LOCK(wdev);
 768
 769         if (wdev->sme_state != CFG80211_SME_IDLE)
 770                 return -EALREADY;
 771
 772         if (WARN_ON(wdev->connect_keys)) {
 773                 kfree(wdev->connect_keys);
 774                 wdev->connect_keys = NULL;
 775         }
 776
 777         if (connkeys && connkeys->def >= 0) {
 778                 int idx;
 779                 u32 cipher;
 780
 781                 idx = connkeys->def;
 782                 cipher = connkeys->params[idx].cipher;
 783                 /* If given a WEP key we may need it for shared key auth */
 784                 if (cipher == WLAN_CIPHER_SUITE_WEP40 ||
 785                     cipher == WLAN_CIPHER_SUITE_WEP104) {
 786                         connect->key_idx = idx;
 787                         connect->key = connkeys->params[idx].key;
 788                         connect->key_len = connkeys->params[idx].key_len;
 789
 790                         /*
 791                          * If ciphers are not set (e.g. when going through
 792                          * iwconfig), we have to set them appropriately here.
 793                          */
 794                         if (connect->crypto.cipher_group == 0)
 795                                 connect->crypto.cipher_group = cipher;
 796
 797                         if (connect->crypto.n_ciphers_pairwise == 0) {
 798                                 connect->crypto.n_ciphers_pairwise = 1;
 799                                 connect->crypto.ciphers_pairwise[0] = cipher;
 800                         }
 801                 }
 802         }
 803
 804         if (!rdev->ops->connect) {
 805                 if (!rdev->ops->auth || !rdev->ops->assoc)
 806                         return -EOPNOTSUPP;
 807
 808                 if (WARN_ON(wdev->conn))
 809                         return -EINPROGRESS;
 810
 811                 wdev->conn = kzalloc(sizeof(*wdev->conn), GFP_KERNEL);
 812                 if (!wdev->conn)
 813                         return -ENOMEM;
 814
 815                 /*
 816                  * Copy all parameters, and treat explicitly IEs, BSSID, SSID.
 817                  */
 818                 memcpy(&wdev->conn->params, connect, sizeof(*connect));
 819                 if (connect->bssid) {
 820                         wdev->conn->params.bssid = wdev->conn->bssid;
 821                         memcpy(wdev->conn->bssid, connect->bssid, ETH_ALEN);
 822                 }
 823
 824                 if (connect->ie) {
 825                         wdev->conn->ie = kmemdup(connect->ie, connect->ie_len,
 826                                                 GFP_KERNEL);
 827                         wdev->conn->params.ie = wdev->conn->ie;
 828                         if (!wdev->conn->ie) {
 829                                 kfree(wdev->conn);
 830                                 wdev->conn = NULL;
 831                                 return -ENOMEM;
 832                         }
 833                 }
 834
 835                 if (connect->auth_type == NL80211_AUTHTYPE_AUTOMATIC) {
 836                         wdev->conn->auto_auth = true;
 837                         /* start with open system ... should mostly work */
 838                         wdev->conn->params.auth_type =
 839                                 NL80211_AUTHTYPE_OPEN_SYSTEM;
 840                 } else {
 841                         wdev->conn->auto_auth = false;
 842                 }
 843
 844                 memcpy(wdev->ssid, connect->ssid, connect->ssid_len);
 845                 wdev->ssid_len = connect->ssid_len;
 846                 wdev->conn->params.ssid = wdev->ssid;
 847                 wdev->conn->params.ssid_len = connect->ssid_len;
 848
 849                 /* see if we have the bss already */
 850                 bss = cfg80211_get_conn_bss(wdev);
 851
 852                 wdev->sme_state = CFG80211_SME_CONNECTING;
 853                 wdev->connect_keys = connkeys;
 854
 855                 if (prev_bssid) {
 856                         memcpy(wdev->conn->prev_bssid, prev_bssid, ETH_ALEN);
 857                         wdev->conn->prev_bssid_valid = true;
 858                 }
 859
 860                 /* we're good if we have a matching bss struct */
 861                 if (bss) {
 862                         wdev->conn->state = CFG80211_CONN_AUTHENTICATE_NEXT;
 863                         err = cfg80211_conn_do_work(wdev);
 864                         cfg80211_put_bss(bss);
 865                 } else {
 866                         /* otherwise we'll need to scan for the AP first */
 867                         err = cfg80211_conn_scan(wdev);
 868                         /*
 869                          * If we can't scan right now, then we need to scan again
 870                          * after the current scan finished, since the parameters
 871                          * changed (unless we find a good AP anyway).
 872                          */
 873                         if (err == -EBUSY) {
 874                                 err = 0;
 875                                 wdev->conn->state = CFG80211_CONN_SCAN_AGAIN;
 876                         }
 877                 }
 878                 if (err) {
 879                         kfree(wdev->conn->ie);
 880                         kfree(wdev->conn);
 881                         wdev->conn = NULL;
 882                         wdev->sme_state = CFG80211_SME_IDLE;
 883                         wdev->connect_keys = NULL;
 884                         wdev->ssid_len = 0;
 885                 }
 886
 887                 return err;
 888         } else {
 889                 wdev->sme_state = CFG80211_SME_CONNECTING;
 890                 wdev->connect_keys = connkeys;
 891                 err = rdev->ops->connect(&rdev->wiphy, dev, connect);
 892                 if (err) {
 893                         wdev->connect_keys = NULL;
 894                         wdev->sme_state = CFG80211_SME_IDLE;
 895                         return err;
 896                 }
 897
 898                 memcpy(wdev->ssid, connect->ssid, connect->ssid_len);
 899                 wdev->ssid_len = connect->ssid_len;
 900
 901                 return 0;
 902         }
 903 }
 904
 905 int cfg80211_connect(struct cfg80211_registered_device *rdev,
 906                      struct net_device *dev,
 907                      struct cfg80211_connect_params *connect,
 908                      struct cfg80211_cached_keys *connkeys)
 909 {
 910         int err;
 911
 912         mutex_lock(&rdev->devlist_mtx);
 913         wdev_lock(dev->ieee80211_ptr);
 914         err = __cfg80211_connect(rdev, dev, connect, connkeys, NULL);
 915         wdev_unlock(dev->ieee80211_ptr);
 916         mutex_unlock(&rdev->devlist_mtx);
 917
 918         return err;
 919 }
 920
 921 int __cfg80211_disconnect(struct cfg80211_registered_device *rdev,
 922                           struct net_device *dev, u16 reason, bool wextev)
 923 {
 924         struct wireless_dev *wdev = dev->ieee80211_ptr;
 925         int err;
 926
 927         ASSERT_WDEV_LOCK(wdev);
 928
 929         if (wdev->sme_state == CFG80211_SME_IDLE)
 930                 return -EINVAL;
 931
 932         kfree(wdev->connect_keys);
 933         wdev->connect_keys = NULL;
 934
 935         if (!rdev->ops->disconnect) {
 936                 if (!rdev->ops->deauth)
 937                         return -EOPNOTSUPP;
 938
 939                 /* was it connected by userspace SME? */
 940                 if (!wdev->conn) {
 941                         cfg80211_mlme_down(rdev, dev);
 942                         return 0;
 943                 }
 944
 945                 if (wdev->sme_state == CFG80211_SME_CONNECTING &&
 946                     (wdev->conn->state == CFG80211_CONN_SCANNING ||
 947                      wdev->conn->state == CFG80211_CONN_SCAN_AGAIN)) {
 948                         wdev->sme_state = CFG80211_SME_IDLE;
 949                         kfree(wdev->conn->ie);
 950                         kfree(wdev->conn);
 951                         wdev->conn = NULL;
 952                         wdev->ssid_len = 0;
 953                         return 0;
 954                 }
 955
 956                 /* wdev->conn->params.bssid must be set if > SCANNING */
 957                 err = __cfg80211_mlme_deauth(rdev, dev,
 958                                              wdev->conn->params.bssid,
 959                                              NULL, 0, reason, false);
 960                 if (err)
 961                         return err;
 962         } else {
 963                 err = rdev->ops->disconnect(&rdev->wiphy, dev, reason);
 964                 if (err)
 965                         return err;
 966         }
 967
 968         if (wdev->sme_state == CFG80211_SME_CONNECTED)
 969                 __cfg80211_disconnected(dev, NULL, 0, 0, false);
 970         else if (wdev->sme_state == CFG80211_SME_CONNECTING)
 971                 __cfg80211_connect_result(dev, NULL, NULL, 0, NULL, 0,
 972                                           WLAN_STATUS_UNSPECIFIED_FAILURE,
 973                                           wextev, NULL);
 974
 975         return 0;
 976 }
 977
 978 int cfg80211_disconnect(struct cfg80211_registered_device *rdev,
 979                         struct net_device *dev,
 980                         u16 reason, bool wextev)
 981 {
 982         int err;
 983
 984         wdev_lock(dev->ieee80211_ptr);
 985         err = __cfg80211_disconnect(rdev, dev, reason, wextev);
 986         wdev_unlock(dev->ieee80211_ptr);
 987
 988         return err;
 989 }
 990
 991 void cfg80211_sme_disassoc(struct net_device *dev, int idx)
 992 {
 993         struct wireless_dev *wdev = dev->ieee80211_ptr;
 994         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 995         u8 bssid[ETH_ALEN];
 996
 997         ASSERT_WDEV_LOCK(wdev);
 998
 999         if (!wdev->conn)
1000                 return;
1001
1002         if (wdev->conn->state == CFG80211_CONN_IDLE)
1003                 return;
1004
1005         /*
1006          * Ok, so the association was made by this SME -- we don't
1007          * want it any more so deauthenticate too.
1008          */
1009
1010         if (!wdev->auth_bsses[idx])
1011                 return;
1012
1013         memcpy(bssid, wdev->auth_bsses[idx]->pub.bssid, ETH_ALEN);
1014         if (__cfg80211_mlme_deauth(rdev, dev, bssid,
1015                                    NULL, 0, WLAN_REASON_DEAUTH_LEAVING,
1016                                    false)) {
1017                 /* whatever -- assume gone anyway */
1018                 cfg80211_unhold_bss(wdev->auth_bsses[idx]);
1019                 cfg80211_put_bss(&wdev->auth_bsses[idx]->pub);
1020                 wdev->auth_bsses[idx] = NULL;
1021         }
1022 }