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         /*
  47          * All devices must be idle as otherwise if you are actively
  48          * scanning some new beacon hints could be learned and would
  49          * count as new regulatory hints.
  50          */
  51         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
  52                 list_for_each_entry(wdev, &rdev->wdev_list, list) {
  53                         wdev_lock(wdev);
  54                         if (wdev->sme_state != CFG80211_SME_IDLE)
  55                                 is_all_idle = false;
  56                         wdev_unlock(wdev);
  57                 }
  58         }
  59
  60         return is_all_idle;
  61 }
  62
  63 static void disconnect_work(struct work_struct *work)
  64 {
  65         rtnl_lock();
  66         if (cfg80211_is_all_idle())
  67                 regulatory_hint_disconnect();
  68         rtnl_unlock();
  69 }
  70
  71 static DECLARE_WORK(cfg80211_disconnect_work, disconnect_work);
  72
  73 static int cfg80211_conn_scan(struct wireless_dev *wdev)
  74 {
  75         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
  76         struct cfg80211_scan_request *request;
  77         int n_channels, err;
  78
  79         ASSERT_RTNL();
  80         ASSERT_RDEV_LOCK(rdev);
  81         ASSERT_WDEV_LOCK(wdev);
  82
  83         if (rdev->scan_req)
  84                 return -EBUSY;
  85
  86         if (wdev->conn->params.channel) {
  87                 n_channels = 1;
  88         } else {
  89                 enum ieee80211_band band;
  90                 n_channels = 0;
  91
  92                 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
  93                         if (!wdev->wiphy->bands[band])
  94                                 continue;
  95                         n_channels += wdev->wiphy->bands[band]->n_channels;
  96                 }
  97         }
  98         request = kzalloc(sizeof(*request) + sizeof(request->ssids[0]) +
  99                           sizeof(request->channels[0]) * n_channels,
 100                           GFP_KERNEL);
 101         if (!request)
 102                 return -ENOMEM;
 103
 104         if (wdev->conn->params.channel)
 105                 request->channels[0] = wdev->conn->params.channel;
 106         else {
 107                 int i = 0, j;
 108                 enum ieee80211_band band;
 109                 struct ieee80211_supported_band *bands;
 110                 struct ieee80211_channel *channel;
 111
 112                 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 113                         bands = wdev->wiphy->bands[band];
 114                         if (!bands)
 115                                 continue;
 116                         for (j = 0; j < bands->n_channels; j++) {
 117                                 channel = &bands->channels[j];
 118                                 if (channel->flags & IEEE80211_CHAN_DISABLED)
 119                                         continue;
 120                                 request->channels[i++] = channel;
 121                         }
 122                         request->rates[band] = (1 << bands->n_bitrates) - 1;
 123                 }
 124                 n_channels = i;
 125         }
 126         request->n_channels = n_channels;
 127         request->ssids = (void *)&request->channels[n_channels];
 128         request->n_ssids = 1;
 129
 130         memcpy(request->ssids[0].ssid, wdev->conn->params.ssid,
 131                 wdev->conn->params.ssid_len);
 132         request->ssids[0].ssid_len = wdev->conn->params.ssid_len;
 133
 134         request->wdev = wdev;
 135         request->wiphy = &rdev->wiphy;
 136         request->scan_start = jiffies;
 137
 138         rdev->scan_req = request;
 139
 140         err = rdev_scan(rdev, request);
 141         if (!err) {
 142                 wdev->conn->state = CFG80211_CONN_SCANNING;
 143                 nl80211_send_scan_start(rdev, wdev);
 144                 dev_hold(wdev->netdev);
 145         } else {
 146                 rdev->scan_req = NULL;
 147                 kfree(request);
 148         }
 149         return err;
 150 }
 151
 152 static int cfg80211_conn_do_work(struct wireless_dev *wdev)
 153 {
 154         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 155         struct cfg80211_connect_params *params;
 156         struct cfg80211_assoc_request req = {};
 157         int err;
 158
 159         ASSERT_WDEV_LOCK(wdev);
 160
 161         if (!wdev->conn)
 162                 return 0;
 163
 164         params = &wdev->conn->params;
 165
 166         switch (wdev->conn->state) {
 167         case CFG80211_CONN_SCAN_AGAIN:
 168                 return cfg80211_conn_scan(wdev);
 169         case CFG80211_CONN_AUTHENTICATE_NEXT:
 170                 BUG_ON(!rdev->ops->auth);
 171                 wdev->conn->state = CFG80211_CONN_AUTHENTICATING;
 172                 return cfg80211_mlme_auth(rdev, wdev->netdev,
 173                                           params->channel, params->auth_type,
 174                                           params->bssid,
 175                                           params->ssid, params->ssid_len,
 176                                           NULL, 0,
 177                                           params->key, params->key_len,
 178                                           params->key_idx, NULL, 0);
 179         case CFG80211_CONN_ASSOCIATE_NEXT:
 180                 BUG_ON(!rdev->ops->assoc);
 181                 wdev->conn->state = CFG80211_CONN_ASSOCIATING;
 182                 if (wdev->conn->prev_bssid_valid)
 183                         req.prev_bssid = wdev->conn->prev_bssid;
 184                 req.ie = params->ie;
 185                 req.ie_len = params->ie_len;
 186                 req.use_mfp = params->mfp != NL80211_MFP_NO;
 187                 req.crypto = params->crypto;
 188                 req.flags = params->flags;
 189                 req.ht_capa = params->ht_capa;
 190                 req.ht_capa_mask = params->ht_capa_mask;
 191                 req.vht_capa = params->vht_capa;
 192                 req.vht_capa_mask = params->vht_capa_mask;
 193
 194                 err = cfg80211_mlme_assoc(rdev, wdev->netdev, params->channel,
 195                                           params->bssid, params->ssid,
 196                                           params->ssid_len, &req);
 197                 if (err)
 198                         cfg80211_mlme_deauth(rdev, wdev->netdev, params->bssid,
 199                                              NULL, 0,
 200                                              WLAN_REASON_DEAUTH_LEAVING,
 201                                              false);
 202                 return err;
 203         case CFG80211_CONN_DEAUTH_ASSOC_FAIL:
 204                 cfg80211_mlme_deauth(rdev, wdev->netdev, params->bssid,
 205                                      NULL, 0,
 206                                      WLAN_REASON_DEAUTH_LEAVING, false);
 207                 /* return an error so that we call __cfg80211_connect_result() */
 208                 return -EINVAL;
 209         default:
 210                 return 0;
 211         }
 212 }
 213
 214 void cfg80211_conn_work(struct work_struct *work)
 215 {
 216         struct cfg80211_registered_device *rdev =
 217                 container_of(work, struct cfg80211_registered_device, conn_work);
 218         struct wireless_dev *wdev;
 219         u8 bssid_buf[ETH_ALEN], *bssid = NULL;
 220
 221         rtnl_lock();
 222
 223         list_for_each_entry(wdev, &rdev->wdev_list, list) {
 224                 if (!wdev->netdev)
 225                         continue;
 226
 227                 wdev_lock(wdev);
 228                 if (!netif_running(wdev->netdev)) {
 229                         wdev_unlock(wdev);
 230                         continue;
 231                 }
 232                 if (wdev->sme_state != CFG80211_SME_CONNECTING || !wdev->conn) {
 233                         wdev_unlock(wdev);
 234                         continue;
 235                 }
 236                 if (wdev->conn->params.bssid) {
 237                         memcpy(bssid_buf, wdev->conn->params.bssid, ETH_ALEN);
 238                         bssid = bssid_buf;
 239                 }
 240                 if (cfg80211_conn_do_work(wdev))
 241                         __cfg80211_connect_result(
 242                                         wdev->netdev, bssid,
 243                                         NULL, 0, NULL, 0,
 244                                         WLAN_STATUS_UNSPECIFIED_FAILURE,
 245                                         false, NULL);
 246                 wdev_unlock(wdev);
 247         }
 248
 249         rtnl_unlock();
 250 }
 251
 252 static struct cfg80211_bss *cfg80211_get_conn_bss(struct wireless_dev *wdev)
 253 {
 254         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 255         struct cfg80211_bss *bss;
 256         u16 capa = WLAN_CAPABILITY_ESS;
 257
 258         ASSERT_WDEV_LOCK(wdev);
 259
 260         if (wdev->conn->params.privacy)
 261                 capa |= WLAN_CAPABILITY_PRIVACY;
 262
 263         bss = cfg80211_get_bss(wdev->wiphy, wdev->conn->params.channel,
 264                                wdev->conn->params.bssid,
 265                                wdev->conn->params.ssid,
 266                                wdev->conn->params.ssid_len,
 267                                WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_PRIVACY,
 268                                capa);
 269         if (!bss)
 270                 return NULL;
 271
 272         memcpy(wdev->conn->bssid, bss->bssid, ETH_ALEN);
 273         wdev->conn->params.bssid = wdev->conn->bssid;
 274         wdev->conn->params.channel = bss->channel;
 275         wdev->conn->state = CFG80211_CONN_AUTHENTICATE_NEXT;
 276         schedule_work(&rdev->conn_work);
 277
 278         return bss;
 279 }
 280
 281 static void __cfg80211_sme_scan_done(struct net_device *dev)
 282 {
 283         struct wireless_dev *wdev = dev->ieee80211_ptr;
 284         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 285         struct cfg80211_bss *bss;
 286
 287         ASSERT_WDEV_LOCK(wdev);
 288
 289         if (wdev->sme_state != CFG80211_SME_CONNECTING)
 290                 return;
 291
 292         if (!wdev->conn)
 293                 return;
 294
 295         if (wdev->conn->state != CFG80211_CONN_SCANNING &&
 296             wdev->conn->state != CFG80211_CONN_SCAN_AGAIN)
 297                 return;
 298
 299         bss = cfg80211_get_conn_bss(wdev);
 300         if (bss) {
 301                 cfg80211_put_bss(&rdev->wiphy, bss);
 302         } else {
 303                 /* not found */
 304                 if (wdev->conn->state == CFG80211_CONN_SCAN_AGAIN)
 305                         schedule_work(&rdev->conn_work);
 306                 else
 307                         __cfg80211_connect_result(
 308                                         wdev->netdev,
 309                                         wdev->conn->params.bssid,
 310                                         NULL, 0, NULL, 0,
 311                                         WLAN_STATUS_UNSPECIFIED_FAILURE,
 312                                         false, NULL);
 313         }
 314 }
 315
 316 void cfg80211_sme_scan_done(struct net_device *dev)
 317 {
 318         struct wireless_dev *wdev = dev->ieee80211_ptr;
 319
 320         wdev_lock(wdev);
 321         __cfg80211_sme_scan_done(dev);
 322         wdev_unlock(wdev);
 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         const 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->wiphy, &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                 cfg80211_put_bss(wdev->wiphy, bss);
 479                 return;
 480         }
 481
 482         if (!bss)
 483                 bss = cfg80211_get_bss(wdev->wiphy,
 484                                        wdev->conn ? wdev->conn->params.channel :
 485                                        NULL,
 486                                        bssid,
 487                                        wdev->ssid, wdev->ssid_len,
 488                                        WLAN_CAPABILITY_ESS,
 489                                        WLAN_CAPABILITY_ESS);
 490
 491         if (WARN_ON(!bss))
 492                 return;
 493
 494         cfg80211_hold_bss(bss_from_pub(bss));
 495         wdev->current_bss = bss_from_pub(bss);
 496
 497         wdev->sme_state = CFG80211_SME_CONNECTED;
 498         cfg80211_upload_connect_keys(wdev);
 499
 500         rcu_read_lock();
 501         country_ie = ieee80211_bss_get_ie(bss, WLAN_EID_COUNTRY);
 502         if (!country_ie) {
 503                 rcu_read_unlock();
 504                 return;
 505         }
 506
 507         country_ie = kmemdup(country_ie, 2 + country_ie[1], GFP_ATOMIC);
 508         rcu_read_unlock();
 509
 510         if (!country_ie)
 511                 return;
 512
 513         /*
 514          * ieee80211_bss_get_ie() ensures we can access:
 515          * - country_ie + 2, the start of the country ie data, and
 516          * - and country_ie[1] which is the IE length
 517          */
 518         regulatory_hint_11d(wdev->wiphy, bss->channel->band,
 519                             country_ie + 2, country_ie[1]);
 520         kfree(country_ie);
 521 }
 522
 523 void cfg80211_connect_result(struct net_device *dev, const u8 *bssid,
 524                              const u8 *req_ie, size_t req_ie_len,
 525                              const u8 *resp_ie, size_t resp_ie_len,
 526                              u16 status, gfp_t gfp)
 527 {
 528         struct wireless_dev *wdev = dev->ieee80211_ptr;
 529         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 530         struct cfg80211_event *ev;
 531         unsigned long flags;
 532
 533         CFG80211_DEV_WARN_ON(wdev->sme_state != CFG80211_SME_CONNECTING);
 534
 535         ev = kzalloc(sizeof(*ev) + req_ie_len + resp_ie_len, gfp);
 536         if (!ev)
 537                 return;
 538
 539         ev->type = EVENT_CONNECT_RESULT;
 540         if (bssid)
 541                 memcpy(ev->cr.bssid, bssid, ETH_ALEN);
 542         if (req_ie_len) {
 543                 ev->cr.req_ie = ((u8 *)ev) + sizeof(*ev);
 544                 ev->cr.req_ie_len = req_ie_len;
 545                 memcpy((void *)ev->cr.req_ie, req_ie, req_ie_len);
 546         }
 547         if (resp_ie_len) {
 548                 ev->cr.resp_ie = ((u8 *)ev) + sizeof(*ev) + req_ie_len;
 549                 ev->cr.resp_ie_len = resp_ie_len;
 550                 memcpy((void *)ev->cr.resp_ie, resp_ie, resp_ie_len);
 551         }
 552         ev->cr.status = status;
 553
 554         spin_lock_irqsave(&wdev->event_lock, flags);
 555         list_add_tail(&ev->list, &wdev->event_list);
 556         spin_unlock_irqrestore(&wdev->event_lock, flags);
 557         queue_work(cfg80211_wq, &rdev->event_work);
 558 }
 559 EXPORT_SYMBOL(cfg80211_connect_result);
 560
 561 void __cfg80211_roamed(struct wireless_dev *wdev,
 562                        struct cfg80211_bss *bss,
 563                        const u8 *req_ie, size_t req_ie_len,
 564                        const u8 *resp_ie, size_t resp_ie_len)
 565 {
 566 #ifdef CONFIG_CFG80211_WEXT
 567         union iwreq_data wrqu;
 568 #endif
 569         ASSERT_WDEV_LOCK(wdev);
 570
 571         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION &&
 572                     wdev->iftype != NL80211_IFTYPE_P2P_CLIENT))
 573                 goto out;
 574
 575         if (wdev->sme_state != CFG80211_SME_CONNECTED)
 576                 goto out;
 577
 578         /* internal error -- how did we get to CONNECTED w/o BSS? */
 579         if (WARN_ON(!wdev->current_bss)) {
 580                 goto out;
 581         }
 582
 583         cfg80211_unhold_bss(wdev->current_bss);
 584         cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
 585         wdev->current_bss = NULL;
 586
 587         cfg80211_hold_bss(bss_from_pub(bss));
 588         wdev->current_bss = bss_from_pub(bss);
 589
 590         nl80211_send_roamed(wiphy_to_dev(wdev->wiphy), wdev->netdev, bss->bssid,
 591                             req_ie, req_ie_len, resp_ie, resp_ie_len,
 592                             GFP_KERNEL);
 593
 594 #ifdef CONFIG_CFG80211_WEXT
 595         if (req_ie) {
 596                 memset(&wrqu, 0, sizeof(wrqu));
 597                 wrqu.data.length = req_ie_len;
 598                 wireless_send_event(wdev->netdev, IWEVASSOCREQIE,
 599                                     &wrqu, req_ie);
 600         }
 601
 602         if (resp_ie) {
 603                 memset(&wrqu, 0, sizeof(wrqu));
 604                 wrqu.data.length = resp_ie_len;
 605                 wireless_send_event(wdev->netdev, IWEVASSOCRESPIE,
 606                                     &wrqu, resp_ie);
 607         }
 608
 609         memset(&wrqu, 0, sizeof(wrqu));
 610         wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 611         memcpy(wrqu.ap_addr.sa_data, bss->bssid, ETH_ALEN);
 612         memcpy(wdev->wext.prev_bssid, bss->bssid, ETH_ALEN);
 613         wdev->wext.prev_bssid_valid = true;
 614         wireless_send_event(wdev->netdev, SIOCGIWAP, &wrqu, NULL);
 615 #endif
 616
 617         return;
 618 out:
 619         cfg80211_put_bss(wdev->wiphy, bss);
 620 }
 621
 622 void cfg80211_roamed(struct net_device *dev,
 623                      struct ieee80211_channel *channel,
 624                      const u8 *bssid,
 625                      const u8 *req_ie, size_t req_ie_len,
 626                      const u8 *resp_ie, size_t resp_ie_len, gfp_t gfp)
 627 {
 628         struct wireless_dev *wdev = dev->ieee80211_ptr;
 629         struct cfg80211_bss *bss;
 630
 631         CFG80211_DEV_WARN_ON(wdev->sme_state != CFG80211_SME_CONNECTED);
 632
 633         bss = cfg80211_get_bss(wdev->wiphy, channel, bssid, wdev->ssid,
 634                                wdev->ssid_len, WLAN_CAPABILITY_ESS,
 635                                WLAN_CAPABILITY_ESS);
 636         if (WARN_ON(!bss))
 637                 return;
 638
 639         cfg80211_roamed_bss(dev, bss, req_ie, req_ie_len, resp_ie,
 640                             resp_ie_len, gfp);
 641 }
 642 EXPORT_SYMBOL(cfg80211_roamed);
 643
 644 void cfg80211_roamed_bss(struct net_device *dev,
 645                          struct cfg80211_bss *bss, const u8 *req_ie,
 646                          size_t req_ie_len, const u8 *resp_ie,
 647                          size_t resp_ie_len, gfp_t gfp)
 648 {
 649         struct wireless_dev *wdev = dev->ieee80211_ptr;
 650         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 651         struct cfg80211_event *ev;
 652         unsigned long flags;
 653
 654         CFG80211_DEV_WARN_ON(wdev->sme_state != CFG80211_SME_CONNECTED);
 655
 656         if (WARN_ON(!bss))
 657                 return;
 658
 659         ev = kzalloc(sizeof(*ev) + req_ie_len + resp_ie_len, gfp);
 660         if (!ev) {
 661                 cfg80211_put_bss(wdev->wiphy, bss);
 662                 return;
 663         }
 664
 665         ev->type = EVENT_ROAMED;
 666         ev->rm.req_ie = ((u8 *)ev) + sizeof(*ev);
 667         ev->rm.req_ie_len = req_ie_len;
 668         memcpy((void *)ev->rm.req_ie, req_ie, req_ie_len);
 669         ev->rm.resp_ie = ((u8 *)ev) + sizeof(*ev) + req_ie_len;
 670         ev->rm.resp_ie_len = resp_ie_len;
 671         memcpy((void *)ev->rm.resp_ie, resp_ie, resp_ie_len);
 672         ev->rm.bss = bss;
 673
 674         spin_lock_irqsave(&wdev->event_lock, flags);
 675         list_add_tail(&ev->list, &wdev->event_list);
 676         spin_unlock_irqrestore(&wdev->event_lock, flags);
 677         queue_work(cfg80211_wq, &rdev->event_work);
 678 }
 679 EXPORT_SYMBOL(cfg80211_roamed_bss);
 680
 681 void __cfg80211_disconnected(struct net_device *dev, const u8 *ie,
 682                              size_t ie_len, u16 reason, bool from_ap)
 683 {
 684         struct wireless_dev *wdev = dev->ieee80211_ptr;
 685         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 686         int i;
 687 #ifdef CONFIG_CFG80211_WEXT
 688         union iwreq_data wrqu;
 689 #endif
 690
 691         ASSERT_WDEV_LOCK(wdev);
 692
 693         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION &&
 694                     wdev->iftype != NL80211_IFTYPE_P2P_CLIENT))
 695                 return;
 696
 697         if (wdev->sme_state != CFG80211_SME_CONNECTED)
 698                 return;
 699
 700         if (wdev->current_bss) {
 701                 cfg80211_unhold_bss(wdev->current_bss);
 702                 cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
 703         }
 704
 705         wdev->current_bss = NULL;
 706         wdev->sme_state = CFG80211_SME_IDLE;
 707         wdev->ssid_len = 0;
 708
 709         if (wdev->conn) {
 710                 kfree(wdev->conn->ie);
 711                 wdev->conn->ie = NULL;
 712                 kfree(wdev->conn);
 713                 wdev->conn = NULL;
 714         }
 715
 716         nl80211_send_disconnected(rdev, dev, reason, ie, ie_len, from_ap);
 717
 718         /*
 719          * Delete all the keys ... pairwise keys can't really
 720          * exist any more anyway, but default keys might.
 721          */
 722         if (rdev->ops->del_key)
 723                 for (i = 0; i < 6; i++)
 724                         rdev_del_key(rdev, dev, i, false, NULL);
 725
 726 #ifdef CONFIG_CFG80211_WEXT
 727         memset(&wrqu, 0, sizeof(wrqu));
 728         wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 729         wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL);
 730         wdev->wext.connect.ssid_len = 0;
 731 #endif
 732
 733         schedule_work(&cfg80211_disconnect_work);
 734 }
 735
 736 void cfg80211_disconnected(struct net_device *dev, u16 reason,
 737                            u8 *ie, size_t ie_len, gfp_t gfp)
 738 {
 739         struct wireless_dev *wdev = dev->ieee80211_ptr;
 740         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 741         struct cfg80211_event *ev;
 742         unsigned long flags;
 743
 744         CFG80211_DEV_WARN_ON(wdev->sme_state != CFG80211_SME_CONNECTED);
 745
 746         ev = kzalloc(sizeof(*ev) + ie_len, gfp);
 747         if (!ev)
 748                 return;
 749
 750         ev->type = EVENT_DISCONNECTED;
 751         ev->dc.ie = ((u8 *)ev) + sizeof(*ev);
 752         ev->dc.ie_len = ie_len;
 753         memcpy((void *)ev->dc.ie, ie, ie_len);
 754         ev->dc.reason = reason;
 755
 756         spin_lock_irqsave(&wdev->event_lock, flags);
 757         list_add_tail(&ev->list, &wdev->event_list);
 758         spin_unlock_irqrestore(&wdev->event_lock, flags);
 759         queue_work(cfg80211_wq, &rdev->event_work);
 760 }
 761 EXPORT_SYMBOL(cfg80211_disconnected);
 762
 763 int cfg80211_connect(struct cfg80211_registered_device *rdev,
 764                      struct net_device *dev,
 765                      struct cfg80211_connect_params *connect,
 766                      struct cfg80211_cached_keys *connkeys,
 767                      const u8 *prev_bssid)
 768 {
 769         struct wireless_dev *wdev = dev->ieee80211_ptr;
 770         struct cfg80211_bss *bss = NULL;
 771         int err;
 772
 773         ASSERT_WDEV_LOCK(wdev);
 774
 775         if (wdev->sme_state != CFG80211_SME_IDLE)
 776                 return -EALREADY;
 777
 778         if (WARN_ON(wdev->connect_keys)) {
 779                 kfree(wdev->connect_keys);
 780                 wdev->connect_keys = NULL;
 781         }
 782
 783         cfg80211_oper_and_ht_capa(&connect->ht_capa_mask,
 784                                   rdev->wiphy.ht_capa_mod_mask);
 785
 786         if (connkeys && connkeys->def >= 0) {
 787                 int idx;
 788                 u32 cipher;
 789
 790                 idx = connkeys->def;
 791                 cipher = connkeys->params[idx].cipher;
 792                 /* If given a WEP key we may need it for shared key auth */
 793                 if (cipher == WLAN_CIPHER_SUITE_WEP40 ||
 794                     cipher == WLAN_CIPHER_SUITE_WEP104) {
 795                         connect->key_idx = idx;
 796                         connect->key = connkeys->params[idx].key;
 797                         connect->key_len = connkeys->params[idx].key_len;
 798
 799                         /*
 800                          * If ciphers are not set (e.g. when going through
 801                          * iwconfig), we have to set them appropriately here.
 802                          */
 803                         if (connect->crypto.cipher_group == 0)
 804                                 connect->crypto.cipher_group = cipher;
 805
 806                         if (connect->crypto.n_ciphers_pairwise == 0) {
 807                                 connect->crypto.n_ciphers_pairwise = 1;
 808                                 connect->crypto.ciphers_pairwise[0] = cipher;
 809                         }
 810                 }
 811         }
 812
 813         if (!rdev->ops->connect) {
 814                 if (!rdev->ops->auth || !rdev->ops->assoc)
 815                         return -EOPNOTSUPP;
 816
 817                 if (WARN_ON(wdev->conn))
 818                         return -EINPROGRESS;
 819
 820                 wdev->conn = kzalloc(sizeof(*wdev->conn), GFP_KERNEL);
 821                 if (!wdev->conn)
 822                         return -ENOMEM;
 823
 824                 /*
 825                  * Copy all parameters, and treat explicitly IEs, BSSID, SSID.
 826                  */
 827                 memcpy(&wdev->conn->params, connect, sizeof(*connect));
 828                 if (connect->bssid) {
 829                         wdev->conn->params.bssid = wdev->conn->bssid;
 830                         memcpy(wdev->conn->bssid, connect->bssid, ETH_ALEN);
 831                 }
 832
 833                 if (connect->ie) {
 834                         wdev->conn->ie = kmemdup(connect->ie, connect->ie_len,
 835                                                 GFP_KERNEL);
 836                         wdev->conn->params.ie = wdev->conn->ie;
 837                         if (!wdev->conn->ie) {
 838                                 kfree(wdev->conn);
 839                                 wdev->conn = NULL;
 840                                 return -ENOMEM;
 841                         }
 842                 }
 843
 844                 if (connect->auth_type == NL80211_AUTHTYPE_AUTOMATIC) {
 845                         wdev->conn->auto_auth = true;
 846                         /* start with open system ... should mostly work */
 847                         wdev->conn->params.auth_type =
 848                                 NL80211_AUTHTYPE_OPEN_SYSTEM;
 849                 } else {
 850                         wdev->conn->auto_auth = false;
 851                 }
 852
 853                 memcpy(wdev->ssid, connect->ssid, connect->ssid_len);
 854                 wdev->ssid_len = connect->ssid_len;
 855                 wdev->conn->params.ssid = wdev->ssid;
 856                 wdev->conn->params.ssid_len = connect->ssid_len;
 857
 858                 /* see if we have the bss already */
 859                 bss = cfg80211_get_conn_bss(wdev);
 860
 861                 wdev->sme_state = CFG80211_SME_CONNECTING;
 862                 wdev->connect_keys = connkeys;
 863
 864                 if (prev_bssid) {
 865                         memcpy(wdev->conn->prev_bssid, prev_bssid, ETH_ALEN);
 866                         wdev->conn->prev_bssid_valid = true;
 867                 }
 868
 869                 /* we're good if we have a matching bss struct */
 870                 if (bss) {
 871                         wdev->conn->state = CFG80211_CONN_AUTHENTICATE_NEXT;
 872                         err = cfg80211_conn_do_work(wdev);
 873                         cfg80211_put_bss(wdev->wiphy, bss);
 874                 } else {
 875                         /* otherwise we'll need to scan for the AP first */
 876                         err = cfg80211_conn_scan(wdev);
 877                         /*
 878                          * If we can't scan right now, then we need to scan again
 879                          * after the current scan finished, since the parameters
 880                          * changed (unless we find a good AP anyway).
 881                          */
 882                         if (err == -EBUSY) {
 883                                 err = 0;
 884                                 wdev->conn->state = CFG80211_CONN_SCAN_AGAIN;
 885                         }
 886                 }
 887                 if (err) {
 888                         kfree(wdev->conn->ie);
 889                         kfree(wdev->conn);
 890                         wdev->conn = NULL;
 891                         wdev->sme_state = CFG80211_SME_IDLE;
 892                         wdev->connect_keys = NULL;
 893                         wdev->ssid_len = 0;
 894                 }
 895
 896                 return err;
 897         } else {
 898                 wdev->sme_state = CFG80211_SME_CONNECTING;
 899                 wdev->connect_keys = connkeys;
 900                 err = rdev_connect(rdev, dev, connect);
 901                 if (err) {
 902                         wdev->connect_keys = NULL;
 903                         wdev->sme_state = CFG80211_SME_IDLE;
 904                         return err;
 905                 }
 906
 907                 memcpy(wdev->ssid, connect->ssid, connect->ssid_len);
 908                 wdev->ssid_len = connect->ssid_len;
 909
 910                 return 0;
 911         }
 912 }
 913
 914 int cfg80211_disconnect(struct cfg80211_registered_device *rdev,
 915                         struct net_device *dev, u16 reason, bool wextev)
 916 {
 917         struct wireless_dev *wdev = dev->ieee80211_ptr;
 918         int err;
 919
 920         ASSERT_WDEV_LOCK(wdev);
 921
 922         if (wdev->sme_state == CFG80211_SME_IDLE)
 923                 return -EINVAL;
 924
 925         kfree(wdev->connect_keys);
 926         wdev->connect_keys = NULL;
 927
 928         if (!rdev->ops->disconnect) {
 929                 if (!rdev->ops->deauth)
 930                         return -EOPNOTSUPP;
 931
 932                 /* was it connected by userspace SME? */
 933                 if (!wdev->conn) {
 934                         cfg80211_mlme_down(rdev, dev);
 935                         goto disconnect;
 936                 }
 937
 938                 if (wdev->sme_state == CFG80211_SME_CONNECTING &&
 939                     (wdev->conn->state == CFG80211_CONN_SCANNING ||
 940                      wdev->conn->state == CFG80211_CONN_SCAN_AGAIN)) {
 941                         wdev->sme_state = CFG80211_SME_IDLE;
 942                         kfree(wdev->conn->ie);
 943                         kfree(wdev->conn);
 944                         wdev->conn = NULL;
 945                         wdev->ssid_len = 0;
 946                         return 0;
 947                 }
 948
 949                 /* wdev->conn->params.bssid must be set if > SCANNING */
 950                 err = cfg80211_mlme_deauth(rdev, dev,
 951                                              wdev->conn->params.bssid,
 952                                              NULL, 0, reason, false);
 953                 if (err)
 954                         return err;
 955         } else {
 956                 err = rdev_disconnect(rdev, dev, reason);
 957                 if (err)
 958                         return err;
 959         }
 960
 961  disconnect:
 962         if (wdev->sme_state == CFG80211_SME_CONNECTED)
 963                 __cfg80211_disconnected(dev, NULL, 0, 0, false);
 964         else if (wdev->sme_state == CFG80211_SME_CONNECTING)
 965                 __cfg80211_connect_result(dev, NULL, NULL, 0, NULL, 0,
 966                                           WLAN_STATUS_UNSPECIFIED_FAILURE,
 967                                           wextev, NULL);
 968
 969         return 0;
 970 }
 971
 972 void cfg80211_sme_disassoc(struct net_device *dev,
 973                            struct cfg80211_internal_bss *bss)
 974 {
 975         struct wireless_dev *wdev = dev->ieee80211_ptr;
 976         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 977         u8 bssid[ETH_ALEN];
 978
 979         ASSERT_WDEV_LOCK(wdev);
 980
 981         if (!wdev->conn)
 982                 return;
 983
 984         if (wdev->conn->state == CFG80211_CONN_IDLE)
 985                 return;
 986
 987         /*
 988          * Ok, so the association was made by this SME -- we don't
 989          * want it any more so deauthenticate too.
 990          */
 991
 992         memcpy(bssid, bss->pub.bssid, ETH_ALEN);
 993
 994         cfg80211_mlme_deauth(rdev, dev, bssid, NULL, 0,
 995                              WLAN_REASON_DEAUTH_LEAVING, false);
 996 }