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 <net/iw_handler.h>
  14 #include <net/cfg80211.h>
  15 #include <net/rtnetlink.h>
  16 #include "nl80211.h"
  17 #include "reg.h"
  18
  19 struct cfg80211_conn {
  20         struct cfg80211_connect_params params;
  21         /* these are sub-states of the _CONNECTING sme_state */
  22         enum {
  23                 CFG80211_CONN_IDLE,
  24                 CFG80211_CONN_SCANNING,
  25                 CFG80211_CONN_SCAN_AGAIN,
  26                 CFG80211_CONN_AUTHENTICATE_NEXT,
  27                 CFG80211_CONN_AUTHENTICATING,
  28                 CFG80211_CONN_ASSOCIATE_NEXT,
  29                 CFG80211_CONN_ASSOCIATING,
  30                 CFG80211_CONN_DEAUTH_ASSOC_FAIL,
  31         } state;
  32         u8 bssid[ETH_ALEN], prev_bssid[ETH_ALEN];
  33         u8 *ie;
  34         size_t ie_len;
  35         bool auto_auth, prev_bssid_valid;
  36 };
  37
  38 static bool cfg80211_is_all_idle(void)
  39 {
  40         struct cfg80211_registered_device *rdev;
  41         struct wireless_dev *wdev;
  42         bool is_all_idle = true;
  43
  44         mutex_lock(&cfg80211_mutex);
  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                 cfg80211_lock_rdev(rdev);
  53                 list_for_each_entry(wdev, &rdev->netdev_list, list) {
  54                         wdev_lock(wdev);
  55                         if (wdev->sme_state != CFG80211_SME_IDLE)
  56                                 is_all_idle = false;
  57                         wdev_unlock(wdev);
  58                 }
  59                 cfg80211_unlock_rdev(rdev);
  60         }
  61
  62         mutex_unlock(&cfg80211_mutex);
  63
  64         return is_all_idle;
  65 }
  66
  67 static void disconnect_work(struct work_struct *work)
  68 {
  69         if (!cfg80211_is_all_idle())
  70                 return;
  71
  72         regulatory_hint_disconnect();
  73 }
  74
  75 static DECLARE_WORK(cfg80211_disconnect_work, disconnect_work);
  76
  77 static int cfg80211_conn_scan(struct wireless_dev *wdev)
  78 {
  79         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
  80         struct cfg80211_scan_request *request;
  81         int n_channels, err;
  82
  83         ASSERT_RTNL();
  84         ASSERT_RDEV_LOCK(rdev);
  85         ASSERT_WDEV_LOCK(wdev);
  86
  87         if (rdev->scan_req)
  88                 return -EBUSY;
  89
  90         if (wdev->conn->params.channel) {
  91                 n_channels = 1;
  92         } else {
  93                 enum ieee80211_band band;
  94                 n_channels = 0;
  95
  96                 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
  97                         if (!wdev->wiphy->bands[band])
  98                                 continue;
  99                         n_channels += wdev->wiphy->bands[band]->n_channels;
 100                 }
 101         }
 102         request = kzalloc(sizeof(*request) + sizeof(request->ssids[0]) +
 103                           sizeof(request->channels[0]) * n_channels,
 104                           GFP_KERNEL);
 105         if (!request)
 106                 return -ENOMEM;
 107
 108         if (wdev->conn->params.channel)
 109                 request->channels[0] = wdev->conn->params.channel;
 110         else {
 111                 int i = 0, j;
 112                 enum ieee80211_band band;
 113
 114                 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 115                         if (!wdev->wiphy->bands[band])
 116                                 continue;
 117                         for (j = 0; j < wdev->wiphy->bands[band]->n_channels;
 118                              i++, j++)
 119                                 request->channels[i] =
 120                                         &wdev->wiphy->bands[band]->channels[j];
 121                         request->rates[band] =
 122                                 (1 << wdev->wiphy->bands[band]->n_bitrates) - 1;
 123                 }
 124         }
 125         request->n_channels = n_channels;
 126         request->ssids = (void *)&request->channels[n_channels];
 127         request->n_ssids = 1;
 128
 129         memcpy(request->ssids[0].ssid, wdev->conn->params.ssid,
 130                 wdev->conn->params.ssid_len);
 131         request->ssids[0].ssid_len = wdev->conn->params.ssid_len;
 132
 133         request->dev = wdev->netdev;
 134         request->wiphy = &rdev->wiphy;
 135
 136         rdev->scan_req = request;
 137
 138         err = rdev->ops->scan(wdev->wiphy, wdev->netdev, request);
 139         if (!err) {
 140                 wdev->conn->state = CFG80211_CONN_SCANNING;
 141                 nl80211_send_scan_start(rdev, wdev->netdev);
 142                 dev_hold(wdev->netdev);
 143         } else {
 144                 rdev->scan_req = NULL;
 145                 kfree(request);
 146         }
 147         return err;
 148 }
 149
 150 static int cfg80211_conn_do_work(struct wireless_dev *wdev)
 151 {
 152         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 153         struct cfg80211_connect_params *params;
 154         const u8 *prev_bssid = NULL;
 155         int err;
 156
 157         ASSERT_WDEV_LOCK(wdev);
 158
 159         if (!wdev->conn)
 160                 return 0;
 161
 162         params = &wdev->conn->params;
 163
 164         switch (wdev->conn->state) {
 165         case CFG80211_CONN_SCAN_AGAIN:
 166                 return cfg80211_conn_scan(wdev);
 167         case CFG80211_CONN_AUTHENTICATE_NEXT:
 168                 BUG_ON(!rdev->ops->auth);
 169                 wdev->conn->state = CFG80211_CONN_AUTHENTICATING;
 170                 return __cfg80211_mlme_auth(rdev, wdev->netdev,
 171                                             params->channel, params->auth_type,
 172                                             params->bssid,
 173                                             params->ssid, params->ssid_len,
 174                                             NULL, 0,
 175                                             params->key, params->key_len,
 176                                             params->key_idx, false);
 177         case CFG80211_CONN_ASSOCIATE_NEXT:
 178                 BUG_ON(!rdev->ops->assoc);
 179                 wdev->conn->state = CFG80211_CONN_ASSOCIATING;
 180                 if (wdev->conn->prev_bssid_valid)
 181                         prev_bssid = wdev->conn->prev_bssid;
 182                 err = __cfg80211_mlme_assoc(rdev, wdev->netdev,
 183                                             params->channel, params->bssid,
 184                                             prev_bssid,
 185                                             params->ssid, params->ssid_len,
 186                                             params->ie, params->ie_len,
 187                                             false, &params->crypto);
 188                 if (err)
 189                         __cfg80211_mlme_deauth(rdev, wdev->netdev, params->bssid,
 190                                                NULL, 0,
 191                                                WLAN_REASON_DEAUTH_LEAVING,
 192                                                false);
 193                 return err;
 194         case CFG80211_CONN_DEAUTH_ASSOC_FAIL:
 195                 __cfg80211_mlme_deauth(rdev, wdev->netdev, params->bssid,
 196                                        NULL, 0,
 197                                        WLAN_REASON_DEAUTH_LEAVING, false);
 198                 /* return an error so that we call __cfg80211_connect_result() */
 199                 return -EINVAL;
 200         default:
 201                 return 0;
 202         }
 203 }
 204
 205 void cfg80211_conn_work(struct work_struct *work)
 206 {
 207         struct cfg80211_registered_device *rdev =
 208                 container_of(work, struct cfg80211_registered_device, conn_work);
 209         struct wireless_dev *wdev;
 210         u8 bssid_buf[ETH_ALEN], *bssid = NULL;
 211
 212         rtnl_lock();
 213         cfg80211_lock_rdev(rdev);
 214         mutex_lock(&rdev->devlist_mtx);
 215
 216         list_for_each_entry(wdev, &rdev->netdev_list, list) {
 217                 wdev_lock(wdev);
 218                 if (!netif_running(wdev->netdev)) {
 219                         wdev_unlock(wdev);
 220                         continue;
 221                 }
 222                 if (wdev->sme_state != CFG80211_SME_CONNECTING) {
 223                         wdev_unlock(wdev);
 224                         continue;
 225                 }
 226                 if (wdev->conn->params.bssid) {
 227                         memcpy(bssid_buf, wdev->conn->params.bssid, ETH_ALEN);
 228                         bssid = bssid_buf;
 229                 }
 230                 if (cfg80211_conn_do_work(wdev))
 231                         __cfg80211_connect_result(
 232                                         wdev->netdev, bssid,
 233                                         NULL, 0, NULL, 0,
 234                                         WLAN_STATUS_UNSPECIFIED_FAILURE,
 235                                         false, NULL);
 236                 wdev_unlock(wdev);
 237         }
 238
 239         mutex_unlock(&rdev->devlist_mtx);
 240         cfg80211_unlock_rdev(rdev);
 241         rtnl_unlock();
 242 }
 243
 244 static struct cfg80211_bss *cfg80211_get_conn_bss(struct wireless_dev *wdev)
 245 {
 246         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 247         struct cfg80211_bss *bss;
 248         u16 capa = WLAN_CAPABILITY_ESS;
 249
 250         ASSERT_WDEV_LOCK(wdev);
 251
 252         if (wdev->conn->params.privacy)
 253                 capa |= WLAN_CAPABILITY_PRIVACY;
 254
 255         bss = cfg80211_get_bss(wdev->wiphy, wdev->conn->params.channel,
 256                                wdev->conn->params.bssid,
 257                                wdev->conn->params.ssid,
 258                                wdev->conn->params.ssid_len,
 259                                WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_PRIVACY,
 260                                capa);
 261         if (!bss)
 262                 return NULL;
 263
 264         memcpy(wdev->conn->bssid, bss->bssid, ETH_ALEN);
 265         wdev->conn->params.bssid = wdev->conn->bssid;
 266         wdev->conn->params.channel = bss->channel;
 267         wdev->conn->state = CFG80211_CONN_AUTHENTICATE_NEXT;
 268         schedule_work(&rdev->conn_work);
 269
 270         return bss;
 271 }
 272
 273 static void __cfg80211_sme_scan_done(struct net_device *dev)
 274 {
 275         struct wireless_dev *wdev = dev->ieee80211_ptr;
 276         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 277         struct cfg80211_bss *bss;
 278
 279         ASSERT_WDEV_LOCK(wdev);
 280
 281         if (wdev->sme_state != CFG80211_SME_CONNECTING)
 282                 return;
 283
 284         if (!wdev->conn)
 285                 return;
 286
 287         if (wdev->conn->state != CFG80211_CONN_SCANNING &&
 288             wdev->conn->state != CFG80211_CONN_SCAN_AGAIN)
 289                 return;
 290
 291         bss = cfg80211_get_conn_bss(wdev);
 292         if (bss) {
 293                 cfg80211_put_bss(bss);
 294         } else {
 295                 /* not found */
 296                 if (wdev->conn->state == CFG80211_CONN_SCAN_AGAIN)
 297                         schedule_work(&rdev->conn_work);
 298                 else
 299                         __cfg80211_connect_result(
 300                                         wdev->netdev,
 301                                         wdev->conn->params.bssid,
 302                                         NULL, 0, NULL, 0,
 303                                         WLAN_STATUS_UNSPECIFIED_FAILURE,
 304                                         false, NULL);
 305         }
 306 }
 307
 308 void cfg80211_sme_scan_done(struct net_device *dev)
 309 {
 310         struct wireless_dev *wdev = dev->ieee80211_ptr;
 311
 312         mutex_lock(&wiphy_to_dev(wdev->wiphy)->devlist_mtx);
 313         wdev_lock(wdev);
 314         __cfg80211_sme_scan_done(dev);
 315         wdev_unlock(wdev);
 316         mutex_unlock(&wiphy_to_dev(wdev->wiphy)->devlist_mtx);
 317 }
 318
 319 void cfg80211_sme_rx_auth(struct net_device *dev,
 320                           const u8 *buf, size_t len)
 321 {
 322         struct wireless_dev *wdev = dev->ieee80211_ptr;
 323         struct wiphy *wiphy = wdev->wiphy;
 324         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 325         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)buf;
 326         u16 status_code = le16_to_cpu(mgmt->u.auth.status_code);
 327
 328         ASSERT_WDEV_LOCK(wdev);
 329
 330         /* should only RX auth frames when connecting */
 331         if (wdev->sme_state != CFG80211_SME_CONNECTING)
 332                 return;
 333
 334         if (WARN_ON(!wdev->conn))
 335                 return;
 336
 337         if (status_code == WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG &&
 338             wdev->conn->auto_auth &&
 339             wdev->conn->params.auth_type != NL80211_AUTHTYPE_NETWORK_EAP) {
 340                 /* select automatically between only open, shared, leap */
 341                 switch (wdev->conn->params.auth_type) {
 342                 case NL80211_AUTHTYPE_OPEN_SYSTEM:
 343                         if (wdev->connect_keys)
 344                                 wdev->conn->params.auth_type =
 345                                         NL80211_AUTHTYPE_SHARED_KEY;
 346                         else
 347                                 wdev->conn->params.auth_type =
 348                                         NL80211_AUTHTYPE_NETWORK_EAP;
 349                         break;
 350                 case NL80211_AUTHTYPE_SHARED_KEY:
 351                         wdev->conn->params.auth_type =
 352                                 NL80211_AUTHTYPE_NETWORK_EAP;
 353                         break;
 354                 default:
 355                         /* huh? */
 356                         wdev->conn->params.auth_type =
 357                                 NL80211_AUTHTYPE_OPEN_SYSTEM;
 358                         break;
 359                 }
 360                 wdev->conn->state = CFG80211_CONN_AUTHENTICATE_NEXT;
 361                 schedule_work(&rdev->conn_work);
 362         } else if (status_code != WLAN_STATUS_SUCCESS) {
 363                 __cfg80211_connect_result(dev, mgmt->bssid, NULL, 0, NULL, 0,
 364                                           status_code, false, NULL);
 365         } else if (wdev->sme_state == CFG80211_SME_CONNECTING &&
 366                  wdev->conn->state == CFG80211_CONN_AUTHENTICATING) {
 367                 wdev->conn->state = CFG80211_CONN_ASSOCIATE_NEXT;
 368                 schedule_work(&rdev->conn_work);
 369         }
 370 }
 371
 372 bool cfg80211_sme_failed_reassoc(struct wireless_dev *wdev)
 373 {
 374         struct wiphy *wiphy = wdev->wiphy;
 375         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 376
 377         if (WARN_ON(!wdev->conn))
 378                 return false;
 379
 380         if (!wdev->conn->prev_bssid_valid)
 381                 return false;
 382
 383         /*
 384          * Some stupid APs don't accept reassoc, so we
 385          * need to fall back to trying regular assoc.
 386          */
 387         wdev->conn->prev_bssid_valid = false;
 388         wdev->conn->state = CFG80211_CONN_ASSOCIATE_NEXT;
 389         schedule_work(&rdev->conn_work);
 390
 391         return true;
 392 }
 393
 394 void cfg80211_sme_failed_assoc(struct wireless_dev *wdev)
 395 {
 396         struct wiphy *wiphy = wdev->wiphy;
 397         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 398
 399         wdev->conn->state = CFG80211_CONN_DEAUTH_ASSOC_FAIL;
 400         schedule_work(&rdev->conn_work);
 401 }
 402
 403 void __cfg80211_connect_result(struct net_device *dev, const u8 *bssid,
 404                                const u8 *req_ie, size_t req_ie_len,
 405                                const u8 *resp_ie, size_t resp_ie_len,
 406                                u16 status, bool wextev,
 407                                struct cfg80211_bss *bss)
 408 {
 409         struct wireless_dev *wdev = dev->ieee80211_ptr;
 410         u8 *country_ie;
 411 #ifdef CONFIG_CFG80211_WEXT
 412         union iwreq_data wrqu;
 413 #endif
 414
 415         ASSERT_WDEV_LOCK(wdev);
 416
 417         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION &&
 418                     wdev->iftype != NL80211_IFTYPE_P2P_CLIENT))
 419                 return;
 420
 421         if (wdev->sme_state != CFG80211_SME_CONNECTING)
 422                 return;
 423
 424         nl80211_send_connect_result(wiphy_to_dev(wdev->wiphy), dev,
 425                                     bssid, req_ie, req_ie_len,
 426                                     resp_ie, resp_ie_len,
 427                                     status, GFP_KERNEL);
 428
 429 #ifdef CONFIG_CFG80211_WEXT
 430         if (wextev) {
 431                 if (req_ie && status == WLAN_STATUS_SUCCESS) {
 432                         memset(&wrqu, 0, sizeof(wrqu));
 433                         wrqu.data.length = req_ie_len;
 434                         wireless_send_event(dev, IWEVASSOCREQIE, &wrqu, req_ie);
 435                 }
 436
 437                 if (resp_ie && status == WLAN_STATUS_SUCCESS) {
 438                         memset(&wrqu, 0, sizeof(wrqu));
 439                         wrqu.data.length = resp_ie_len;
 440                         wireless_send_event(dev, IWEVASSOCRESPIE, &wrqu, resp_ie);
 441                 }
 442
 443                 memset(&wrqu, 0, sizeof(wrqu));
 444                 wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 445                 if (bssid && status == WLAN_STATUS_SUCCESS) {
 446                         memcpy(wrqu.ap_addr.sa_data, bssid, ETH_ALEN);
 447                         memcpy(wdev->wext.prev_bssid, bssid, ETH_ALEN);
 448                         wdev->wext.prev_bssid_valid = true;
 449                 }
 450                 wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL);
 451         }
 452 #endif
 453
 454         if (wdev->current_bss) {
 455                 cfg80211_unhold_bss(wdev->current_bss);
 456                 cfg80211_put_bss(&wdev->current_bss->pub);
 457                 wdev->current_bss = NULL;
 458         }
 459
 460         if (wdev->conn)
 461                 wdev->conn->state = CFG80211_CONN_IDLE;
 462
 463         if (status != WLAN_STATUS_SUCCESS) {
 464                 wdev->sme_state = CFG80211_SME_IDLE;
 465                 if (wdev->conn)
 466                         kfree(wdev->conn->ie);
 467                 kfree(wdev->conn);
 468                 wdev->conn = NULL;
 469                 kfree(wdev->connect_keys);
 470                 wdev->connect_keys = NULL;
 471                 wdev->ssid_len = 0;
 472                 return;
 473         }
 474
 475         if (!bss)
 476                 bss = cfg80211_get_bss(wdev->wiphy,
 477                                        wdev->conn ? wdev->conn->params.channel :
 478                                        NULL,
 479                                        bssid,
 480                                        wdev->ssid, wdev->ssid_len,
 481                                        WLAN_CAPABILITY_ESS,
 482                                        WLAN_CAPABILITY_ESS);
 483
 484         if (WARN_ON(!bss))
 485                 return;
 486
 487         cfg80211_hold_bss(bss_from_pub(bss));
 488         wdev->current_bss = bss_from_pub(bss);
 489
 490         wdev->sme_state = CFG80211_SME_CONNECTED;
 491         cfg80211_upload_connect_keys(wdev);
 492
 493         country_ie = (u8 *) ieee80211_bss_get_ie(bss, WLAN_EID_COUNTRY);
 494
 495         if (!country_ie)
 496                 return;
 497
 498         /*
 499          * ieee80211_bss_get_ie() ensures we can access:
 500          * - country_ie + 2, the start of the country ie data, and
 501          * - and country_ie[1] which is the IE length
 502          */
 503         regulatory_hint_11d(wdev->wiphy,
 504                             bss->channel->band,
 505                             country_ie + 2,
 506                             country_ie[1]);
 507 }
 508
 509 void cfg80211_connect_result(struct net_device *dev, const u8 *bssid,
 510                              const u8 *req_ie, size_t req_ie_len,
 511                              const u8 *resp_ie, size_t resp_ie_len,
 512                              u16 status, gfp_t gfp)
 513 {
 514         struct wireless_dev *wdev = dev->ieee80211_ptr;
 515         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 516         struct cfg80211_event *ev;
 517         unsigned long flags;
 518
 519         CFG80211_DEV_WARN_ON(wdev->sme_state != CFG80211_SME_CONNECTING);
 520
 521         ev = kzalloc(sizeof(*ev) + req_ie_len + resp_ie_len, gfp);
 522         if (!ev)
 523                 return;
 524
 525         ev->type = EVENT_CONNECT_RESULT;
 526         if (bssid)
 527                 memcpy(ev->cr.bssid, bssid, ETH_ALEN);
 528         if (req_ie_len) {
 529                 ev->cr.req_ie = ((u8 *)ev) + sizeof(*ev);
 530                 ev->cr.req_ie_len = req_ie_len;
 531                 memcpy((void *)ev->cr.req_ie, req_ie, req_ie_len);
 532         }
 533         if (resp_ie_len) {
 534                 ev->cr.resp_ie = ((u8 *)ev) + sizeof(*ev) + req_ie_len;
 535                 ev->cr.resp_ie_len = resp_ie_len;
 536                 memcpy((void *)ev->cr.resp_ie, resp_ie, resp_ie_len);
 537         }
 538         ev->cr.status = status;
 539
 540         spin_lock_irqsave(&wdev->event_lock, flags);
 541         list_add_tail(&ev->list, &wdev->event_list);
 542         spin_unlock_irqrestore(&wdev->event_lock, flags);
 543         queue_work(cfg80211_wq, &rdev->event_work);
 544 }
 545 EXPORT_SYMBOL(cfg80211_connect_result);
 546
 547 void __cfg80211_roamed(struct wireless_dev *wdev,
 548                        struct ieee80211_channel *channel,
 549                        const u8 *bssid,
 550                        const u8 *req_ie, size_t req_ie_len,
 551                        const u8 *resp_ie, size_t resp_ie_len)
 552 {
 553         struct cfg80211_bss *bss;
 554 #ifdef CONFIG_CFG80211_WEXT
 555         union iwreq_data wrqu;
 556 #endif
 557
 558         ASSERT_WDEV_LOCK(wdev);
 559
 560         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION &&
 561                     wdev->iftype != NL80211_IFTYPE_P2P_CLIENT))
 562                 return;
 563
 564         if (wdev->sme_state != CFG80211_SME_CONNECTED)
 565                 return;
 566
 567         /* internal error -- how did we get to CONNECTED w/o BSS? */
 568         if (WARN_ON(!wdev->current_bss)) {
 569                 return;
 570         }
 571
 572         cfg80211_unhold_bss(wdev->current_bss);
 573         cfg80211_put_bss(&wdev->current_bss->pub);
 574         wdev->current_bss = NULL;
 575
 576         bss = cfg80211_get_bss(wdev->wiphy, channel, bssid,
 577                                wdev->ssid, wdev->ssid_len,
 578                                WLAN_CAPABILITY_ESS, WLAN_CAPABILITY_ESS);
 579
 580         if (WARN_ON(!bss))
 581                 return;
 582
 583         cfg80211_hold_bss(bss_from_pub(bss));
 584         wdev->current_bss = bss_from_pub(bss);
 585
 586         nl80211_send_roamed(wiphy_to_dev(wdev->wiphy), wdev->netdev, bssid,
 587                             req_ie, req_ie_len, resp_ie, resp_ie_len,
 588                             GFP_KERNEL);
 589
 590 #ifdef CONFIG_CFG80211_WEXT
 591         if (req_ie) {
 592                 memset(&wrqu, 0, sizeof(wrqu));
 593                 wrqu.data.length = req_ie_len;
 594                 wireless_send_event(wdev->netdev, IWEVASSOCREQIE,
 595                                     &wrqu, req_ie);
 596         }
 597
 598         if (resp_ie) {
 599                 memset(&wrqu, 0, sizeof(wrqu));
 600                 wrqu.data.length = resp_ie_len;
 601                 wireless_send_event(wdev->netdev, IWEVASSOCRESPIE,
 602                                     &wrqu, resp_ie);
 603         }
 604
 605         memset(&wrqu, 0, sizeof(wrqu));
 606         wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 607         memcpy(wrqu.ap_addr.sa_data, bssid, ETH_ALEN);
 608         memcpy(wdev->wext.prev_bssid, bssid, ETH_ALEN);
 609         wdev->wext.prev_bssid_valid = true;
 610         wireless_send_event(wdev->netdev, SIOCGIWAP, &wrqu, NULL);
 611 #endif
 612 }
 613
 614 void cfg80211_roamed(struct net_device *dev,
 615                      struct ieee80211_channel *channel,
 616                      const u8 *bssid,
 617                      const u8 *req_ie, size_t req_ie_len,
 618                      const u8 *resp_ie, size_t resp_ie_len, gfp_t gfp)
 619 {
 620         struct wireless_dev *wdev = dev->ieee80211_ptr;
 621         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 622         struct cfg80211_event *ev;
 623         unsigned long flags;
 624
 625         CFG80211_DEV_WARN_ON(wdev->sme_state != CFG80211_SME_CONNECTED);
 626
 627         ev = kzalloc(sizeof(*ev) + req_ie_len + resp_ie_len, gfp);
 628         if (!ev)
 629                 return;
 630
 631         ev->type = EVENT_ROAMED;
 632         ev->rm.channel = channel;
 633         memcpy(ev->rm.bssid, bssid, ETH_ALEN);
 634         ev->rm.req_ie = ((u8 *)ev) + sizeof(*ev);
 635         ev->rm.req_ie_len = req_ie_len;
 636         memcpy((void *)ev->rm.req_ie, req_ie, req_ie_len);
 637         ev->rm.resp_ie = ((u8 *)ev) + sizeof(*ev) + req_ie_len;
 638         ev->rm.resp_ie_len = resp_ie_len;
 639         memcpy((void *)ev->rm.resp_ie, resp_ie, resp_ie_len);
 640
 641         spin_lock_irqsave(&wdev->event_lock, flags);
 642         list_add_tail(&ev->list, &wdev->event_list);
 643         spin_unlock_irqrestore(&wdev->event_lock, flags);
 644         queue_work(cfg80211_wq, &rdev->event_work);
 645 }
 646 EXPORT_SYMBOL(cfg80211_roamed);
 647
 648 void __cfg80211_disconnected(struct net_device *dev, const u8 *ie,
 649                              size_t ie_len, u16 reason, bool from_ap)
 650 {
 651         struct wireless_dev *wdev = dev->ieee80211_ptr;
 652         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 653         int i;
 654 #ifdef CONFIG_CFG80211_WEXT
 655         union iwreq_data wrqu;
 656 #endif
 657
 658         ASSERT_WDEV_LOCK(wdev);
 659
 660         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION &&
 661                     wdev->iftype != NL80211_IFTYPE_P2P_CLIENT))
 662                 return;
 663
 664         if (wdev->sme_state != CFG80211_SME_CONNECTED)
 665                 return;
 666
 667         if (wdev->current_bss) {
 668                 cfg80211_unhold_bss(wdev->current_bss);
 669                 cfg80211_put_bss(&wdev->current_bss->pub);
 670         }
 671
 672         wdev->current_bss = NULL;
 673         wdev->sme_state = CFG80211_SME_IDLE;
 674         wdev->ssid_len = 0;
 675
 676         if (wdev->conn) {
 677                 const u8 *bssid;
 678                 int ret;
 679
 680                 kfree(wdev->conn->ie);
 681                 wdev->conn->ie = NULL;
 682                 kfree(wdev->conn);
 683                 wdev->conn = NULL;
 684
 685                 /*
 686                  * If this disconnect was due to a disassoc, we
 687                  * we might still have an auth BSS around. For
 688                  * the userspace SME that's currently expected,
 689                  * but for the kernel SME (nl80211 CONNECT or
 690                  * wireless extensions) we want to clear up all
 691                  * state.
 692                  */
 693                 for (i = 0; i < MAX_AUTH_BSSES; i++) {
 694                         if (!wdev->auth_bsses[i])
 695                                 continue;
 696                         bssid = wdev->auth_bsses[i]->pub.bssid;
 697                         ret = __cfg80211_mlme_deauth(rdev, dev, bssid, NULL, 0,
 698                                                 WLAN_REASON_DEAUTH_LEAVING,
 699                                                 false);
 700                         WARN(ret, "deauth failed: %d\n", ret);
 701                 }
 702         }
 703
 704         nl80211_send_disconnected(rdev, dev, reason, ie, ie_len, from_ap);
 705
 706         /*
 707          * Delete all the keys ... pairwise keys can't really
 708          * exist any more anyway, but default keys might.
 709          */
 710         if (rdev->ops->del_key)
 711                 for (i = 0; i < 6; i++)
 712                         rdev->ops->del_key(wdev->wiphy, dev, i, false, NULL);
 713
 714 #ifdef CONFIG_CFG80211_WEXT
 715         memset(&wrqu, 0, sizeof(wrqu));
 716         wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 717         wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL);
 718         wdev->wext.connect.ssid_len = 0;
 719 #endif
 720
 721         schedule_work(&cfg80211_disconnect_work);
 722 }
 723
 724 void cfg80211_disconnected(struct net_device *dev, u16 reason,
 725                            u8 *ie, size_t ie_len, gfp_t gfp)
 726 {
 727         struct wireless_dev *wdev = dev->ieee80211_ptr;
 728         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 729         struct cfg80211_event *ev;
 730         unsigned long flags;
 731
 732         CFG80211_DEV_WARN_ON(wdev->sme_state != CFG80211_SME_CONNECTED);
 733
 734         ev = kzalloc(sizeof(*ev) + ie_len, gfp);
 735         if (!ev)
 736                 return;
 737
 738         ev->type = EVENT_DISCONNECTED;
 739         ev->dc.ie = ((u8 *)ev) + sizeof(*ev);
 740         ev->dc.ie_len = ie_len;
 741         memcpy((void *)ev->dc.ie, ie, ie_len);
 742         ev->dc.reason = reason;
 743
 744         spin_lock_irqsave(&wdev->event_lock, flags);
 745         list_add_tail(&ev->list, &wdev->event_list);
 746         spin_unlock_irqrestore(&wdev->event_lock, flags);
 747         queue_work(cfg80211_wq, &rdev->event_work);
 748 }
 749 EXPORT_SYMBOL(cfg80211_disconnected);
 750
 751 int __cfg80211_connect(struct cfg80211_registered_device *rdev,
 752                        struct net_device *dev,
 753                        struct cfg80211_connect_params *connect,
 754                        struct cfg80211_cached_keys *connkeys,
 755                        const u8 *prev_bssid)
 756 {
 757         struct wireless_dev *wdev = dev->ieee80211_ptr;
 758         struct cfg80211_bss *bss = NULL;
 759         int err;
 760
 761         ASSERT_WDEV_LOCK(wdev);
 762
 763         if (wdev->sme_state != CFG80211_SME_IDLE)
 764                 return -EALREADY;
 765
 766         if (WARN_ON(wdev->connect_keys)) {
 767                 kfree(wdev->connect_keys);
 768                 wdev->connect_keys = NULL;
 769         }
 770
 771         if (connkeys && connkeys->def >= 0) {
 772                 int idx;
 773                 u32 cipher;
 774
 775                 idx = connkeys->def;
 776                 cipher = connkeys->params[idx].cipher;
 777                 /* If given a WEP key we may need it for shared key auth */
 778                 if (cipher == WLAN_CIPHER_SUITE_WEP40 ||
 779                     cipher == WLAN_CIPHER_SUITE_WEP104) {
 780                         connect->key_idx = idx;
 781                         connect->key = connkeys->params[idx].key;
 782                         connect->key_len = connkeys->params[idx].key_len;
 783
 784                         /*
 785                          * If ciphers are not set (e.g. when going through
 786                          * iwconfig), we have to set them appropriately here.
 787                          */
 788                         if (connect->crypto.cipher_group == 0)
 789                                 connect->crypto.cipher_group = cipher;
 790
 791                         if (connect->crypto.n_ciphers_pairwise == 0) {
 792                                 connect->crypto.n_ciphers_pairwise = 1;
 793                                 connect->crypto.ciphers_pairwise[0] = cipher;
 794                         }
 795                 }
 796         }
 797
 798         if (!rdev->ops->connect) {
 799                 if (!rdev->ops->auth || !rdev->ops->assoc)
 800                         return -EOPNOTSUPP;
 801
 802                 if (WARN_ON(wdev->conn))
 803                         return -EINPROGRESS;
 804
 805                 wdev->conn = kzalloc(sizeof(*wdev->conn), GFP_KERNEL);
 806                 if (!wdev->conn)
 807                         return -ENOMEM;
 808
 809                 /*
 810                  * Copy all parameters, and treat explicitly IEs, BSSID, SSID.
 811                  */
 812                 memcpy(&wdev->conn->params, connect, sizeof(*connect));
 813                 if (connect->bssid) {
 814                         wdev->conn->params.bssid = wdev->conn->bssid;
 815                         memcpy(wdev->conn->bssid, connect->bssid, ETH_ALEN);
 816                 }
 817
 818                 if (connect->ie) {
 819                         wdev->conn->ie = kmemdup(connect->ie, connect->ie_len,
 820                                                 GFP_KERNEL);
 821                         wdev->conn->params.ie = wdev->conn->ie;
 822                         if (!wdev->conn->ie) {
 823                                 kfree(wdev->conn);
 824                                 wdev->conn = NULL;
 825                                 return -ENOMEM;
 826                         }
 827                 }
 828
 829                 if (connect->auth_type == NL80211_AUTHTYPE_AUTOMATIC) {
 830                         wdev->conn->auto_auth = true;
 831                         /* start with open system ... should mostly work */
 832                         wdev->conn->params.auth_type =
 833                                 NL80211_AUTHTYPE_OPEN_SYSTEM;
 834                 } else {
 835                         wdev->conn->auto_auth = false;
 836                 }
 837
 838                 memcpy(wdev->ssid, connect->ssid, connect->ssid_len);
 839                 wdev->ssid_len = connect->ssid_len;
 840                 wdev->conn->params.ssid = wdev->ssid;
 841                 wdev->conn->params.ssid_len = connect->ssid_len;
 842
 843                 /* see if we have the bss already */
 844                 bss = cfg80211_get_conn_bss(wdev);
 845
 846                 wdev->sme_state = CFG80211_SME_CONNECTING;
 847                 wdev->connect_keys = connkeys;
 848
 849                 if (prev_bssid) {
 850                         memcpy(wdev->conn->prev_bssid, prev_bssid, ETH_ALEN);
 851                         wdev->conn->prev_bssid_valid = true;
 852                 }
 853
 854                 /* we're good if we have a matching bss struct */
 855                 if (bss) {
 856                         wdev->conn->state = CFG80211_CONN_AUTHENTICATE_NEXT;
 857                         err = cfg80211_conn_do_work(wdev);
 858                         cfg80211_put_bss(bss);
 859                 } else {
 860                         /* otherwise we'll need to scan for the AP first */
 861                         err = cfg80211_conn_scan(wdev);
 862                         /*
 863                          * If we can't scan right now, then we need to scan again
 864                          * after the current scan finished, since the parameters
 865                          * changed (unless we find a good AP anyway).
 866                          */
 867                         if (err == -EBUSY) {
 868                                 err = 0;
 869                                 wdev->conn->state = CFG80211_CONN_SCAN_AGAIN;
 870                         }
 871                 }
 872                 if (err) {
 873                         kfree(wdev->conn->ie);
 874                         kfree(wdev->conn);
 875                         wdev->conn = NULL;
 876                         wdev->sme_state = CFG80211_SME_IDLE;
 877                         wdev->connect_keys = NULL;
 878                         wdev->ssid_len = 0;
 879                 }
 880
 881                 return err;
 882         } else {
 883                 wdev->sme_state = CFG80211_SME_CONNECTING;
 884                 wdev->connect_keys = connkeys;
 885                 err = rdev->ops->connect(&rdev->wiphy, dev, connect);
 886                 if (err) {
 887                         wdev->connect_keys = NULL;
 888                         wdev->sme_state = CFG80211_SME_IDLE;
 889                         return err;
 890                 }
 891
 892                 memcpy(wdev->ssid, connect->ssid, connect->ssid_len);
 893                 wdev->ssid_len = connect->ssid_len;
 894
 895                 return 0;
 896         }
 897 }
 898
 899 int cfg80211_connect(struct cfg80211_registered_device *rdev,
 900                      struct net_device *dev,
 901                      struct cfg80211_connect_params *connect,
 902                      struct cfg80211_cached_keys *connkeys)
 903 {
 904         int err;
 905
 906         mutex_lock(&rdev->devlist_mtx);
 907         wdev_lock(dev->ieee80211_ptr);
 908         err = __cfg80211_connect(rdev, dev, connect, connkeys, NULL);
 909         wdev_unlock(dev->ieee80211_ptr);
 910         mutex_unlock(&rdev->devlist_mtx);
 911
 912         return err;
 913 }
 914
 915 int __cfg80211_disconnect(struct cfg80211_registered_device *rdev,
 916                           struct net_device *dev, u16 reason, bool wextev)
 917 {
 918         struct wireless_dev *wdev = dev->ieee80211_ptr;
 919         int err;
 920
 921         ASSERT_WDEV_LOCK(wdev);
 922
 923         if (wdev->sme_state == CFG80211_SME_IDLE)
 924                 return -EINVAL;
 925
 926         kfree(wdev->connect_keys);
 927         wdev->connect_keys = NULL;
 928
 929         if (!rdev->ops->disconnect) {
 930                 if (!rdev->ops->deauth)
 931                         return -EOPNOTSUPP;
 932
 933                 /* was it connected by userspace SME? */
 934                 if (!wdev->conn) {
 935                         cfg80211_mlme_down(rdev, dev);
 936                         return 0;
 937                 }
 938
 939                 if (wdev->sme_state == CFG80211_SME_CONNECTING &&
 940                     (wdev->conn->state == CFG80211_CONN_SCANNING ||
 941                      wdev->conn->state == CFG80211_CONN_SCAN_AGAIN)) {
 942                         wdev->sme_state = CFG80211_SME_IDLE;
 943                         kfree(wdev->conn->ie);
 944                         kfree(wdev->conn);
 945                         wdev->conn = NULL;
 946                         wdev->ssid_len = 0;
 947                         return 0;
 948                 }
 949
 950                 /* wdev->conn->params.bssid must be set if > SCANNING */
 951                 err = __cfg80211_mlme_deauth(rdev, dev,
 952                                              wdev->conn->params.bssid,
 953                                              NULL, 0, reason, false);
 954                 if (err)
 955                         return err;
 956         } else {
 957                 err = rdev->ops->disconnect(&rdev->wiphy, dev, reason);
 958                 if (err)
 959                         return err;
 960         }
 961
 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 int cfg80211_disconnect(struct cfg80211_registered_device *rdev,
 973                         struct net_device *dev,
 974                         u16 reason, bool wextev)
 975 {
 976         int err;
 977
 978         wdev_lock(dev->ieee80211_ptr);
 979         err = __cfg80211_disconnect(rdev, dev, reason, wextev);
 980         wdev_unlock(dev->ieee80211_ptr);
 981
 982         return err;
 983 }
 984
 985 void cfg80211_sme_disassoc(struct net_device *dev, int idx)
 986 {
 987         struct wireless_dev *wdev = dev->ieee80211_ptr;
 988         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 989         u8 bssid[ETH_ALEN];
 990
 991         ASSERT_WDEV_LOCK(wdev);
 992
 993         if (!wdev->conn)
 994                 return;
 995
 996         if (wdev->conn->state == CFG80211_CONN_IDLE)
 997                 return;
 998
 999         /*
1000          * Ok, so the association was made by this SME -- we don't
1001          * want it any more so deauthenticate too.
1002          */
1003
1004         if (!wdev->auth_bsses[idx])
1005                 return;
1006
1007         memcpy(bssid, wdev->auth_bsses[idx]->pub.bssid, ETH_ALEN);
1008         if (__cfg80211_mlme_deauth(rdev, dev, bssid,
1009                                    NULL, 0, WLAN_REASON_DEAUTH_LEAVING,
1010                                    false)) {
1011                 /* whatever -- assume gone anyway */
1012                 cfg80211_unhold_bss(wdev->auth_bsses[idx]);
1013                 cfg80211_put_bss(&wdev->auth_bsses[idx]->pub);
1014                 wdev->auth_bsses[idx] = NULL;
1015         }
1016 }