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