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/workqueue.h>
  11 #include <linux/wireless.h>
  12 #include <net/iw_handler.h>
  13 #include <net/cfg80211.h>
  14 #include <net/rtnetlink.h>
  15 #include "nl80211.h"
  16 #include "reg.h"
  17
  18 struct cfg80211_conn {
  19         struct cfg80211_connect_params params;
  20         /* these are sub-states of the _CONNECTING sme_state */
  21         enum {
  22                 CFG80211_CONN_IDLE,
  23                 CFG80211_CONN_SCANNING,
  24                 CFG80211_CONN_SCAN_AGAIN,
  25                 CFG80211_CONN_AUTHENTICATE_NEXT,
  26                 CFG80211_CONN_AUTHENTICATING,
  27                 CFG80211_CONN_ASSOCIATE_NEXT,
  28                 CFG80211_CONN_ASSOCIATING,
  29                 CFG80211_CONN_DEAUTH_ASSOC_FAIL,
  30         } state;
  31         u8 bssid[ETH_ALEN], prev_bssid[ETH_ALEN];
  32         u8 *ie;
  33         size_t ie_len;
  34         bool auto_auth, prev_bssid_valid;
  35 };
  36
  37 bool cfg80211_is_all_idle(void)
  38 {
  39         struct cfg80211_registered_device *rdev;
  40         struct wireless_dev *wdev;
  41         bool is_all_idle = true;
  42
  43         mutex_lock(&cfg80211_mutex);
  44
  45         /*
  46          * All devices must be idle as otherwise if you are actively
  47          * scanning some new beacon hints could be learned and would
  48          * count as new regulatory hints.
  49          */
  50         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
  51                 cfg80211_lock_rdev(rdev);
  52                 list_for_each_entry(wdev, &rdev->netdev_list, list) {
  53                         wdev_lock(wdev);
  54                         if (wdev->sme_state != CFG80211_SME_IDLE)
  55                                 is_all_idle = false;
  56                         wdev_unlock(wdev);
  57                 }
  58                 cfg80211_unlock_rdev(rdev);
  59         }
  60
  61         mutex_unlock(&cfg80211_mutex);
  62
  63         return is_all_idle;
  64 }
  65
  66 static void disconnect_work(struct work_struct *work)
  67 {
  68         if (!cfg80211_is_all_idle())
  69                 return;
  70
  71         regulatory_hint_disconnect();
  72 }
  73
  74 static DECLARE_WORK(cfg80211_disconnect_work, disconnect_work);
  75
  76 static int cfg80211_conn_scan(struct wireless_dev *wdev)
  77 {
  78         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
  79         struct cfg80211_scan_request *request;
  80         int n_channels, err;
  81
  82         ASSERT_RTNL();
  83         ASSERT_RDEV_LOCK(rdev);
  84         ASSERT_WDEV_LOCK(wdev);
  85
  86         if (rdev->scan_req)
  87                 return -EBUSY;
  88
  89         if (wdev->conn->params.channel) {
  90                 n_channels = 1;
  91         } else {
  92                 enum ieee80211_band band;
  93                 n_channels = 0;
  94
  95                 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
  96                         if (!wdev->wiphy->bands[band])
  97                                 continue;
  98                         n_channels += wdev->wiphy->bands[band]->n_channels;
  99                 }
 100         }
 101         request = kzalloc(sizeof(*request) + sizeof(request->ssids[0]) +
 102                           sizeof(request->channels[0]) * n_channels,
 103                           GFP_KERNEL);
 104         if (!request)
 105                 return -ENOMEM;
 106
 107         if (wdev->conn->params.channel)
 108                 request->channels[0] = wdev->conn->params.channel;
 109         else {
 110                 int i = 0, j;
 111                 enum ieee80211_band band;
 112
 113                 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 114                         if (!wdev->wiphy->bands[band])
 115                                 continue;
 116                         for (j = 0; j < wdev->wiphy->bands[band]->n_channels;
 117                              i++, j++)
 118                                 request->channels[i] =
 119                                         &wdev->wiphy->bands[band]->channels[j];
 120                 }
 121         }
 122         request->n_channels = n_channels;
 123         request->ssids = (void *)&request->channels[n_channels];
 124         request->n_ssids = 1;
 125
 126         memcpy(request->ssids[0].ssid, wdev->conn->params.ssid,
 127                 wdev->conn->params.ssid_len);
 128         request->ssids[0].ssid_len = wdev->conn->params.ssid_len;
 129
 130         request->dev = wdev->netdev;
 131         request->wiphy = &rdev->wiphy;
 132
 133         rdev->scan_req = request;
 134
 135         err = rdev->ops->scan(wdev->wiphy, wdev->netdev, request);
 136         if (!err) {
 137                 wdev->conn->state = CFG80211_CONN_SCANNING;
 138                 nl80211_send_scan_start(rdev, wdev->netdev);
 139                 dev_hold(wdev->netdev);
 140         } else {
 141                 rdev->scan_req = NULL;
 142                 kfree(request);
 143         }
 144         return err;
 145 }
 146
 147 static int cfg80211_conn_do_work(struct wireless_dev *wdev)
 148 {
 149         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 150         struct cfg80211_connect_params *params;
 151         const u8 *prev_bssid = NULL;
 152         int err;
 153
 154         ASSERT_WDEV_LOCK(wdev);
 155
 156         if (!wdev->conn)
 157                 return 0;
 158
 159         params = &wdev->conn->params;
 160
 161         switch (wdev->conn->state) {
 162         case CFG80211_CONN_SCAN_AGAIN:
 163                 return cfg80211_conn_scan(wdev);
 164         case CFG80211_CONN_AUTHENTICATE_NEXT:
 165                 BUG_ON(!rdev->ops->auth);
 166                 wdev->conn->state = CFG80211_CONN_AUTHENTICATING;
 167                 return __cfg80211_mlme_auth(rdev, wdev->netdev,
 168                                             params->channel, params->auth_type,
 169                                             params->bssid,
 170                                             params->ssid, params->ssid_len,
 171                                             NULL, 0,
 172                                             params->key, params->key_len,
 173                                             params->key_idx, false);
 174         case CFG80211_CONN_ASSOCIATE_NEXT:
 175                 BUG_ON(!rdev->ops->assoc);
 176                 wdev->conn->state = CFG80211_CONN_ASSOCIATING;
 177                 if (wdev->conn->prev_bssid_valid)
 178                         prev_bssid = wdev->conn->prev_bssid;
 179                 err = __cfg80211_mlme_assoc(rdev, wdev->netdev,
 180                                             params->channel, params->bssid,
 181                                             prev_bssid,
 182                                             params->ssid, params->ssid_len,
 183                                             params->ie, params->ie_len,
 184                                             false, &params->crypto);
 185                 if (err)
 186                         __cfg80211_mlme_deauth(rdev, wdev->netdev, params->bssid,
 187                                                NULL, 0,
 188                                                WLAN_REASON_DEAUTH_LEAVING,
 189                                                false);
 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, false);
 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         if (req_ie_len) {
 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         }
 525         if (resp_ie_len) {
 526                 ev->cr.resp_ie = ((u8 *)ev) + sizeof(*ev) + req_ie_len;
 527                 ev->cr.resp_ie_len = resp_ie_len;
 528                 memcpy((void *)ev->cr.resp_ie, resp_ie, resp_ie_len);
 529         }
 530         ev->cr.status = status;
 531
 532         spin_lock_irqsave(&wdev->event_lock, flags);
 533         list_add_tail(&ev->list, &wdev->event_list);
 534         spin_unlock_irqrestore(&wdev->event_lock, flags);
 535         queue_work(cfg80211_wq, &rdev->event_work);
 536 }
 537 EXPORT_SYMBOL(cfg80211_connect_result);
 538
 539 void __cfg80211_roamed(struct wireless_dev *wdev, const u8 *bssid,
 540                        const u8 *req_ie, size_t req_ie_len,
 541                        const u8 *resp_ie, size_t resp_ie_len)
 542 {
 543         struct cfg80211_bss *bss;
 544 #ifdef CONFIG_CFG80211_WEXT
 545         union iwreq_data wrqu;
 546 #endif
 547
 548         ASSERT_WDEV_LOCK(wdev);
 549
 550         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
 551                 return;
 552
 553         if (wdev->sme_state != CFG80211_SME_CONNECTED)
 554                 return;
 555
 556         /* internal error -- how did we get to CONNECTED w/o BSS? */
 557         if (WARN_ON(!wdev->current_bss)) {
 558                 return;
 559         }
 560
 561         cfg80211_unhold_bss(wdev->current_bss);
 562         cfg80211_put_bss(&wdev->current_bss->pub);
 563         wdev->current_bss = NULL;
 564
 565         bss = cfg80211_get_bss(wdev->wiphy, NULL, bssid,
 566                                wdev->ssid, wdev->ssid_len,
 567                                WLAN_CAPABILITY_ESS, WLAN_CAPABILITY_ESS);
 568
 569         if (WARN_ON(!bss))
 570                 return;
 571
 572         cfg80211_hold_bss(bss_from_pub(bss));
 573         wdev->current_bss = bss_from_pub(bss);
 574
 575         nl80211_send_roamed(wiphy_to_dev(wdev->wiphy), wdev->netdev, bssid,
 576                             req_ie, req_ie_len, resp_ie, resp_ie_len,
 577                             GFP_KERNEL);
 578
 579 #ifdef CONFIG_CFG80211_WEXT
 580         if (req_ie) {
 581                 memset(&wrqu, 0, sizeof(wrqu));
 582                 wrqu.data.length = req_ie_len;
 583                 wireless_send_event(wdev->netdev, IWEVASSOCREQIE,
 584                                     &wrqu, req_ie);
 585         }
 586
 587         if (resp_ie) {
 588                 memset(&wrqu, 0, sizeof(wrqu));
 589                 wrqu.data.length = resp_ie_len;
 590                 wireless_send_event(wdev->netdev, IWEVASSOCRESPIE,
 591                                     &wrqu, resp_ie);
 592         }
 593
 594         memset(&wrqu, 0, sizeof(wrqu));
 595         wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 596         memcpy(wrqu.ap_addr.sa_data, bssid, ETH_ALEN);
 597         memcpy(wdev->wext.prev_bssid, bssid, ETH_ALEN);
 598         wdev->wext.prev_bssid_valid = true;
 599         wireless_send_event(wdev->netdev, SIOCGIWAP, &wrqu, NULL);
 600 #endif
 601 }
 602
 603 void cfg80211_roamed(struct net_device *dev, const u8 *bssid,
 604                      const u8 *req_ie, size_t req_ie_len,
 605                      const u8 *resp_ie, size_t resp_ie_len, gfp_t gfp)
 606 {
 607         struct wireless_dev *wdev = dev->ieee80211_ptr;
 608         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 609         struct cfg80211_event *ev;
 610         unsigned long flags;
 611
 612         CFG80211_DEV_WARN_ON(wdev->sme_state != CFG80211_SME_CONNECTED);
 613
 614         ev = kzalloc(sizeof(*ev) + req_ie_len + resp_ie_len, gfp);
 615         if (!ev)
 616                 return;
 617
 618         ev->type = EVENT_ROAMED;
 619         memcpy(ev->rm.bssid, bssid, ETH_ALEN);
 620         ev->rm.req_ie = ((u8 *)ev) + sizeof(*ev);
 621         ev->rm.req_ie_len = req_ie_len;
 622         memcpy((void *)ev->rm.req_ie, req_ie, req_ie_len);
 623         ev->rm.resp_ie = ((u8 *)ev) + sizeof(*ev) + req_ie_len;
 624         ev->rm.resp_ie_len = resp_ie_len;
 625         memcpy((void *)ev->rm.resp_ie, resp_ie, resp_ie_len);
 626
 627         spin_lock_irqsave(&wdev->event_lock, flags);
 628         list_add_tail(&ev->list, &wdev->event_list);
 629         spin_unlock_irqrestore(&wdev->event_lock, flags);
 630         queue_work(cfg80211_wq, &rdev->event_work);
 631 }
 632 EXPORT_SYMBOL(cfg80211_roamed);
 633
 634 void __cfg80211_disconnected(struct net_device *dev, const u8 *ie,
 635                              size_t ie_len, u16 reason, bool from_ap)
 636 {
 637         struct wireless_dev *wdev = dev->ieee80211_ptr;
 638         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 639         int i;
 640 #ifdef CONFIG_CFG80211_WEXT
 641         union iwreq_data wrqu;
 642 #endif
 643
 644         ASSERT_WDEV_LOCK(wdev);
 645
 646         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
 647                 return;
 648
 649         if (wdev->sme_state != CFG80211_SME_CONNECTED)
 650                 return;
 651
 652         if (wdev->current_bss) {
 653                 cfg80211_unhold_bss(wdev->current_bss);
 654                 cfg80211_put_bss(&wdev->current_bss->pub);
 655         }
 656
 657         wdev->current_bss = NULL;
 658         wdev->sme_state = CFG80211_SME_IDLE;
 659         wdev->ssid_len = 0;
 660
 661         if (wdev->conn) {
 662                 const u8 *bssid;
 663                 int ret;
 664
 665                 kfree(wdev->conn->ie);
 666                 wdev->conn->ie = NULL;
 667                 kfree(wdev->conn);
 668                 wdev->conn = NULL;
 669
 670                 /*
 671                  * If this disconnect was due to a disassoc, we
 672                  * we might still have an auth BSS around. For
 673                  * the userspace SME that's currently expected,
 674                  * but for the kernel SME (nl80211 CONNECT or
 675                  * wireless extensions) we want to clear up all
 676                  * state.
 677                  */
 678                 for (i = 0; i < MAX_AUTH_BSSES; i++) {
 679                         if (!wdev->auth_bsses[i])
 680                                 continue;
 681                         bssid = wdev->auth_bsses[i]->pub.bssid;
 682                         ret = __cfg80211_mlme_deauth(rdev, dev, bssid, NULL, 0,
 683                                                 WLAN_REASON_DEAUTH_LEAVING,
 684                                                 false);
 685                         WARN(ret, "deauth failed: %d\n", ret);
 686                 }
 687         }
 688
 689         nl80211_send_disconnected(rdev, dev, reason, ie, ie_len, from_ap);
 690
 691         /*
 692          * Delete all the keys ... pairwise keys can't really
 693          * exist any more anyway, but default keys might.
 694          */
 695         if (rdev->ops->del_key)
 696                 for (i = 0; i < 6; i++)
 697                         rdev->ops->del_key(wdev->wiphy, dev, i, NULL);
 698
 699 #ifdef CONFIG_CFG80211_WEXT
 700         memset(&wrqu, 0, sizeof(wrqu));
 701         wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 702         wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL);
 703         wdev->wext.connect.ssid_len = 0;
 704 #endif
 705
 706         schedule_work(&cfg80211_disconnect_work);
 707 }
 708
 709 void cfg80211_disconnected(struct net_device *dev, u16 reason,
 710                            u8 *ie, size_t ie_len, gfp_t gfp)
 711 {
 712         struct wireless_dev *wdev = dev->ieee80211_ptr;
 713         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 714         struct cfg80211_event *ev;
 715         unsigned long flags;
 716
 717         CFG80211_DEV_WARN_ON(wdev->sme_state != CFG80211_SME_CONNECTED);
 718
 719         ev = kzalloc(sizeof(*ev) + ie_len, gfp);
 720         if (!ev)
 721                 return;
 722
 723         ev->type = EVENT_DISCONNECTED;
 724         ev->dc.ie = ((u8 *)ev) + sizeof(*ev);
 725         ev->dc.ie_len = ie_len;
 726         memcpy((void *)ev->dc.ie, ie, ie_len);
 727         ev->dc.reason = reason;
 728
 729         spin_lock_irqsave(&wdev->event_lock, flags);
 730         list_add_tail(&ev->list, &wdev->event_list);
 731         spin_unlock_irqrestore(&wdev->event_lock, flags);
 732         queue_work(cfg80211_wq, &rdev->event_work);
 733 }
 734 EXPORT_SYMBOL(cfg80211_disconnected);
 735
 736 int __cfg80211_connect(struct cfg80211_registered_device *rdev,
 737                        struct net_device *dev,
 738                        struct cfg80211_connect_params *connect,
 739                        struct cfg80211_cached_keys *connkeys,
 740                        const u8 *prev_bssid)
 741 {
 742         struct wireless_dev *wdev = dev->ieee80211_ptr;
 743         struct ieee80211_channel *chan;
 744         struct cfg80211_bss *bss = NULL;
 745         int err;
 746
 747         ASSERT_WDEV_LOCK(wdev);
 748
 749         if (wdev->sme_state != CFG80211_SME_IDLE)
 750                 return -EALREADY;
 751
 752         chan = rdev_fixed_channel(rdev, wdev);
 753         if (chan && chan != connect->channel)
 754                 return -EBUSY;
 755
 756         if (WARN_ON(wdev->connect_keys)) {
 757                 kfree(wdev->connect_keys);
 758                 wdev->connect_keys = NULL;
 759         }
 760
 761         if (connkeys && connkeys->def >= 0) {
 762                 int idx;
 763                 u32 cipher;
 764
 765                 idx = connkeys->def;
 766                 cipher = connkeys->params[idx].cipher;
 767                 /* If given a WEP key we may need it for shared key auth */
 768                 if (cipher == WLAN_CIPHER_SUITE_WEP40 ||
 769                     cipher == WLAN_CIPHER_SUITE_WEP104) {
 770                         connect->key_idx = idx;
 771                         connect->key = connkeys->params[idx].key;
 772                         connect->key_len = connkeys->params[idx].key_len;
 773
 774                         /*
 775                          * If ciphers are not set (e.g. when going through
 776                          * iwconfig), we have to set them appropriately here.
 777                          */
 778                         if (connect->crypto.cipher_group == 0)
 779                                 connect->crypto.cipher_group = cipher;
 780
 781                         if (connect->crypto.n_ciphers_pairwise == 0) {
 782                                 connect->crypto.n_ciphers_pairwise = 1;
 783                                 connect->crypto.ciphers_pairwise[0] = cipher;
 784                         }
 785                 }
 786         }
 787
 788         if (!rdev->ops->connect) {
 789                 if (!rdev->ops->auth || !rdev->ops->assoc)
 790                         return -EOPNOTSUPP;
 791
 792                 if (WARN_ON(wdev->conn))
 793                         return -EINPROGRESS;
 794
 795                 wdev->conn = kzalloc(sizeof(*wdev->conn), GFP_KERNEL);
 796                 if (!wdev->conn)
 797                         return -ENOMEM;
 798
 799                 /*
 800                  * Copy all parameters, and treat explicitly IEs, BSSID, SSID.
 801                  */
 802                 memcpy(&wdev->conn->params, connect, sizeof(*connect));
 803                 if (connect->bssid) {
 804                         wdev->conn->params.bssid = wdev->conn->bssid;
 805                         memcpy(wdev->conn->bssid, connect->bssid, ETH_ALEN);
 806                 }
 807
 808                 if (connect->ie) {
 809                         wdev->conn->ie = kmemdup(connect->ie, connect->ie_len,
 810                                                 GFP_KERNEL);
 811                         wdev->conn->params.ie = wdev->conn->ie;
 812                         if (!wdev->conn->ie) {
 813                                 kfree(wdev->conn);
 814                                 wdev->conn = NULL;
 815                                 return -ENOMEM;
 816                         }
 817                 }
 818
 819                 if (connect->auth_type == NL80211_AUTHTYPE_AUTOMATIC) {
 820                         wdev->conn->auto_auth = true;
 821                         /* start with open system ... should mostly work */
 822                         wdev->conn->params.auth_type =
 823                                 NL80211_AUTHTYPE_OPEN_SYSTEM;
 824                 } else {
 825                         wdev->conn->auto_auth = false;
 826                 }
 827
 828                 memcpy(wdev->ssid, connect->ssid, connect->ssid_len);
 829                 wdev->ssid_len = connect->ssid_len;
 830                 wdev->conn->params.ssid = wdev->ssid;
 831                 wdev->conn->params.ssid_len = connect->ssid_len;
 832
 833                 /* see if we have the bss already */
 834                 bss = cfg80211_get_conn_bss(wdev);
 835
 836                 wdev->sme_state = CFG80211_SME_CONNECTING;
 837                 wdev->connect_keys = connkeys;
 838
 839                 if (prev_bssid) {
 840                         memcpy(wdev->conn->prev_bssid, prev_bssid, ETH_ALEN);
 841                         wdev->conn->prev_bssid_valid = true;
 842                 }
 843
 844                 /* we're good if we have a matching bss struct */
 845                 if (bss) {
 846                         wdev->conn->state = CFG80211_CONN_AUTHENTICATE_NEXT;
 847                         err = cfg80211_conn_do_work(wdev);
 848                         cfg80211_put_bss(bss);
 849                 } else {
 850                         /* otherwise we'll need to scan for the AP first */
 851                         err = cfg80211_conn_scan(wdev);
 852                         /*
 853                          * If we can't scan right now, then we need to scan again
 854                          * after the current scan finished, since the parameters
 855                          * changed (unless we find a good AP anyway).
 856                          */
 857                         if (err == -EBUSY) {
 858                                 err = 0;
 859                                 wdev->conn->state = CFG80211_CONN_SCAN_AGAIN;
 860                         }
 861                 }
 862                 if (err) {
 863                         kfree(wdev->conn->ie);
 864                         kfree(wdev->conn);
 865                         wdev->conn = NULL;
 866                         wdev->sme_state = CFG80211_SME_IDLE;
 867                         wdev->connect_keys = NULL;
 868                         wdev->ssid_len = 0;
 869                 }
 870
 871                 return err;
 872         } else {
 873                 wdev->sme_state = CFG80211_SME_CONNECTING;
 874                 wdev->connect_keys = connkeys;
 875                 err = rdev->ops->connect(&rdev->wiphy, dev, connect);
 876                 if (err) {
 877                         wdev->connect_keys = NULL;
 878                         wdev->sme_state = CFG80211_SME_IDLE;
 879                         return err;
 880                 }
 881
 882                 memcpy(wdev->ssid, connect->ssid, connect->ssid_len);
 883                 wdev->ssid_len = connect->ssid_len;
 884
 885                 return 0;
 886         }
 887 }
 888
 889 int cfg80211_connect(struct cfg80211_registered_device *rdev,
 890                      struct net_device *dev,
 891                      struct cfg80211_connect_params *connect,
 892                      struct cfg80211_cached_keys *connkeys)
 893 {
 894         int err;
 895
 896         mutex_lock(&rdev->devlist_mtx);
 897         wdev_lock(dev->ieee80211_ptr);
 898         err = __cfg80211_connect(rdev, dev, connect, connkeys, NULL);
 899         wdev_unlock(dev->ieee80211_ptr);
 900         mutex_unlock(&rdev->devlist_mtx);
 901
 902         return err;
 903 }
 904
 905 int __cfg80211_disconnect(struct cfg80211_registered_device *rdev,
 906                           struct net_device *dev, u16 reason, bool wextev)
 907 {
 908         struct wireless_dev *wdev = dev->ieee80211_ptr;
 909         int err;
 910
 911         ASSERT_WDEV_LOCK(wdev);
 912
 913         if (wdev->sme_state == CFG80211_SME_IDLE)
 914                 return -EINVAL;
 915
 916         kfree(wdev->connect_keys);
 917         wdev->connect_keys = NULL;
 918
 919         if (!rdev->ops->disconnect) {
 920                 if (!rdev->ops->deauth)
 921                         return -EOPNOTSUPP;
 922
 923                 /* was it connected by userspace SME? */
 924                 if (!wdev->conn) {
 925                         cfg80211_mlme_down(rdev, dev);
 926                         return 0;
 927                 }
 928
 929                 if (wdev->sme_state == CFG80211_SME_CONNECTING &&
 930                     (wdev->conn->state == CFG80211_CONN_SCANNING ||
 931                      wdev->conn->state == CFG80211_CONN_SCAN_AGAIN)) {
 932                         wdev->sme_state = CFG80211_SME_IDLE;
 933                         kfree(wdev->conn->ie);
 934                         kfree(wdev->conn);
 935                         wdev->conn = NULL;
 936                         wdev->ssid_len = 0;
 937                         return 0;
 938                 }
 939
 940                 /* wdev->conn->params.bssid must be set if > SCANNING */
 941                 err = __cfg80211_mlme_deauth(rdev, dev,
 942                                              wdev->conn->params.bssid,
 943                                              NULL, 0, reason, false);
 944                 if (err)
 945                         return err;
 946         } else {
 947                 err = rdev->ops->disconnect(&rdev->wiphy, dev, reason);
 948                 if (err)
 949                         return err;
 950         }
 951
 952         if (wdev->sme_state == CFG80211_SME_CONNECTED)
 953                 __cfg80211_disconnected(dev, NULL, 0, 0, false);
 954         else if (wdev->sme_state == CFG80211_SME_CONNECTING)
 955                 __cfg80211_connect_result(dev, NULL, NULL, 0, NULL, 0,
 956                                           WLAN_STATUS_UNSPECIFIED_FAILURE,
 957                                           wextev, NULL);
 958
 959         return 0;
 960 }
 961
 962 int cfg80211_disconnect(struct cfg80211_registered_device *rdev,
 963                         struct net_device *dev,
 964                         u16 reason, bool wextev)
 965 {
 966         int err;
 967
 968         wdev_lock(dev->ieee80211_ptr);
 969         err = __cfg80211_disconnect(rdev, dev, reason, wextev);
 970         wdev_unlock(dev->ieee80211_ptr);
 971
 972         return err;
 973 }
 974
 975 void cfg80211_sme_disassoc(struct net_device *dev, int idx)
 976 {
 977         struct wireless_dev *wdev = dev->ieee80211_ptr;
 978         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 979         u8 bssid[ETH_ALEN];
 980
 981         ASSERT_WDEV_LOCK(wdev);
 982
 983         if (!wdev->conn)
 984                 return;
 985
 986         if (wdev->conn->state == CFG80211_CONN_IDLE)
 987                 return;
 988
 989         /*
 990          * Ok, so the association was made by this SME -- we don't
 991          * want it any more so deauthenticate too.
 992          */
 993
 994         if (!wdev->auth_bsses[idx])
 995                 return;
 996
 997         memcpy(bssid, wdev->auth_bsses[idx]->pub.bssid, ETH_ALEN);
 998         if (__cfg80211_mlme_deauth(rdev, dev, bssid,
 999                                    NULL, 0, WLAN_REASON_DEAUTH_LEAVING,
1000                                    false)) {
1001                 /* whatever -- assume gone anyway */
1002                 cfg80211_unhold_bss(wdev->auth_bsses[idx]);
1003                 cfg80211_put_bss(&wdev->auth_bsses[idx]->pub);
1004                 wdev->auth_bsses[idx] = NULL;
1005         }
1006 }