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