net/wireless/sme.c

   1 /*
   2  * SME code for cfg80211
   3  * both driver SME event handling and the SME implementation
   4  * (for nl80211's connect() and wext)
   5  *
   6  * Copyright 2009       Johannes Berg <johannes@sipsolutions.net>
   7  * Copyright (C) 2009   Intel Corporation. All rights reserved.
   8  */
   9
  10 #include <linux/etherdevice.h>
  11 #include <linux/if_arp.h>
  12 #include <linux/slab.h>
  13 #include <linux/workqueue.h>
  14 #include <linux/wireless.h>
  15 #include <linux/export.h>
  16 #include <net/iw_handler.h>
  17 #include <net/cfg80211.h>
  18 #include <net/rtnetlink.h>
  19 #include "nl80211.h"
  20 #include "reg.h"
  21 #include "rdev-ops.h"
  22
  23 /*
  24  * Software SME in cfg80211, using auth/assoc/deauth calls to the
  25  * driver. This is is for implementing nl80211's connect/disconnect
  26  * and wireless extensions (if configured.)
  27  */
  28
  29 struct cfg80211_conn {
  30         struct cfg80211_connect_params params;
  31         /* these are sub-states of the _CONNECTING sme_state */
  32         enum {
  33                 CFG80211_CONN_SCANNING,
  34                 CFG80211_CONN_SCAN_AGAIN,
  35                 CFG80211_CONN_AUTHENTICATE_NEXT,
  36                 CFG80211_CONN_AUTHENTICATING,
  37                 CFG80211_CONN_AUTH_FAILED,
  38                 CFG80211_CONN_ASSOCIATE_NEXT,
  39                 CFG80211_CONN_ASSOCIATING,
  40                 CFG80211_CONN_ASSOC_FAILED,
  41                 CFG80211_CONN_DEAUTH,
  42                 CFG80211_CONN_CONNECTED,
  43         } state;
  44         u8 bssid[ETH_ALEN], prev_bssid[ETH_ALEN];
  45         u8 *ie;
  46         size_t ie_len;
  47         bool auto_auth, prev_bssid_valid;
  48 };
  49
  50 static void cfg80211_sme_free(struct wireless_dev *wdev)
  51 {
  52         if (!wdev->conn)
  53                 return;
  54
  55         kfree(wdev->conn->ie);
  56         kfree(wdev->conn);
  57         wdev->conn = NULL;
  58 }
  59
  60 static int cfg80211_conn_scan(struct wireless_dev *wdev)
  61 {
  62         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
  63         struct cfg80211_scan_request *request;
  64         int n_channels, err;
  65
  66         ASSERT_RTNL();
  67         ASSERT_RDEV_LOCK(rdev);
  68         ASSERT_WDEV_LOCK(wdev);
  69
  70         if (rdev->scan_req)
  71                 return -EBUSY;
  72
  73         if (wdev->conn->params.channel) {
  74                 n_channels = 1;
  75         } else {
  76                 enum ieee80211_band band;
  77                 n_channels = 0;
  78
  79                 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
  80                         if (!wdev->wiphy->bands[band])
  81                                 continue;
  82                         n_channels += wdev->wiphy->bands[band]->n_channels;
  83                 }
  84         }
  85         request = kzalloc(sizeof(*request) + sizeof(request->ssids[0]) +
  86                           sizeof(request->channels[0]) * n_channels,
  87                           GFP_KERNEL);
  88         if (!request)
  89                 return -ENOMEM;
  90
  91         if (wdev->conn->params.channel)
  92                 request->channels[0] = wdev->conn->params.channel;
  93         else {
  94                 int i = 0, j;
  95                 enum ieee80211_band band;
  96                 struct ieee80211_supported_band *bands;
  97                 struct ieee80211_channel *channel;
  98
  99                 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 100                         bands = wdev->wiphy->bands[band];
 101                         if (!bands)
 102                                 continue;
 103                         for (j = 0; j < bands->n_channels; j++) {
 104                                 channel = &bands->channels[j];
 105                                 if (channel->flags & IEEE80211_CHAN_DISABLED)
 106                                         continue;
 107                                 request->channels[i++] = channel;
 108                         }
 109                         request->rates[band] = (1 << bands->n_bitrates) - 1;
 110                 }
 111                 n_channels = i;
 112         }
 113         request->n_channels = n_channels;
 114         request->ssids = (void *)&request->channels[n_channels];
 115         request->n_ssids = 1;
 116
 117         memcpy(request->ssids[0].ssid, wdev->conn->params.ssid,
 118                 wdev->conn->params.ssid_len);
 119         request->ssids[0].ssid_len = wdev->conn->params.ssid_len;
 120
 121         request->wdev = wdev;
 122         request->wiphy = &rdev->wiphy;
 123         request->scan_start = jiffies;
 124
 125         rdev->scan_req = request;
 126
 127         err = rdev_scan(rdev, request);
 128         if (!err) {
 129                 wdev->conn->state = CFG80211_CONN_SCANNING;
 130                 nl80211_send_scan_start(rdev, wdev);
 131                 dev_hold(wdev->netdev);
 132         } else {
 133                 rdev->scan_req = NULL;
 134                 kfree(request);
 135         }
 136         return err;
 137 }
 138
 139 static int cfg80211_conn_do_work(struct wireless_dev *wdev)
 140 {
 141         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 142         struct cfg80211_connect_params *params;
 143         struct cfg80211_assoc_request req = {};
 144         int err;
 145
 146         ASSERT_WDEV_LOCK(wdev);
 147
 148         if (!wdev->conn)
 149                 return 0;
 150
 151         params = &wdev->conn->params;
 152
 153         switch (wdev->conn->state) {
 154         case CFG80211_CONN_SCANNING:
 155                 /* didn't find it during scan ... */
 156                 return -ENOENT;
 157         case CFG80211_CONN_SCAN_AGAIN:
 158                 return cfg80211_conn_scan(wdev);
 159         case CFG80211_CONN_AUTHENTICATE_NEXT:
 160                 BUG_ON(!rdev->ops->auth);
 161                 wdev->conn->state = CFG80211_CONN_AUTHENTICATING;
 162                 return cfg80211_mlme_auth(rdev, wdev->netdev,
 163                                           params->channel, params->auth_type,
 164                                           params->bssid,
 165                                           params->ssid, params->ssid_len,
 166                                           NULL, 0,
 167                                           params->key, params->key_len,
 168                                           params->key_idx, NULL, 0);
 169         case CFG80211_CONN_AUTH_FAILED:
 170                 return -ENOTCONN;
 171         case CFG80211_CONN_ASSOCIATE_NEXT:
 172                 BUG_ON(!rdev->ops->assoc);
 173                 wdev->conn->state = CFG80211_CONN_ASSOCIATING;
 174                 if (wdev->conn->prev_bssid_valid)
 175                         req.prev_bssid = wdev->conn->prev_bssid;
 176                 req.ie = params->ie;
 177                 req.ie_len = params->ie_len;
 178                 req.use_mfp = params->mfp != NL80211_MFP_NO;
 179                 req.crypto = params->crypto;
 180                 req.flags = params->flags;
 181                 req.ht_capa = params->ht_capa;
 182                 req.ht_capa_mask = params->ht_capa_mask;
 183                 req.vht_capa = params->vht_capa;
 184                 req.vht_capa_mask = params->vht_capa_mask;
 185
 186                 err = cfg80211_mlme_assoc(rdev, wdev->netdev, params->channel,
 187                                           params->bssid, params->ssid,
 188                                           params->ssid_len, &req);
 189                 if (err)
 190                         cfg80211_mlme_deauth(rdev, wdev->netdev, params->bssid,
 191                                              NULL, 0,
 192                                              WLAN_REASON_DEAUTH_LEAVING,
 193                                              false);
 194                 return err;
 195         case CFG80211_CONN_ASSOC_FAILED:
 196                 cfg80211_mlme_deauth(rdev, wdev->netdev, params->bssid,
 197                                      NULL, 0,
 198                                      WLAN_REASON_DEAUTH_LEAVING, false);
 199                 return -ENOTCONN;
 200         case CFG80211_CONN_DEAUTH:
 201                 cfg80211_mlme_deauth(rdev, wdev->netdev, params->bssid,
 202                                      NULL, 0,
 203                                      WLAN_REASON_DEAUTH_LEAVING, false);
 204                 /* free directly, disconnected event already sent */
 205                 cfg80211_sme_free(wdev);
 206                 return 0;
 207         default:
 208                 return 0;
 209         }
 210 }
 211
 212 void cfg80211_conn_work(struct work_struct *work)
 213 {
 214         struct cfg80211_registered_device *rdev =
 215                 container_of(work, struct cfg80211_registered_device, conn_work);
 216         struct wireless_dev *wdev;
 217         u8 bssid_buf[ETH_ALEN], *bssid = NULL;
 218
 219         rtnl_lock();
 220
 221         list_for_each_entry(wdev, &rdev->wdev_list, list) {
 222                 if (!wdev->netdev)
 223                         continue;
 224
 225                 wdev_lock(wdev);
 226                 if (!netif_running(wdev->netdev)) {
 227                         wdev_unlock(wdev);
 228                         continue;
 229                 }
 230                 if (!wdev->conn ||
 231                     wdev->conn->state == CFG80211_CONN_CONNECTED) {
 232                         wdev_unlock(wdev);
 233                         continue;
 234                 }
 235                 if (wdev->conn->params.bssid) {
 236                         memcpy(bssid_buf, wdev->conn->params.bssid, ETH_ALEN);
 237                         bssid = bssid_buf;
 238                 }
 239                 if (cfg80211_conn_do_work(wdev)) {
 240                         __cfg80211_connect_result(
 241                                         wdev->netdev, bssid,
 242                                         NULL, 0, NULL, 0,
 243                                         WLAN_STATUS_UNSPECIFIED_FAILURE,
 244                                         false, NULL);
 245                         cfg80211_sme_free(wdev);
 246                 }
 247                 wdev_unlock(wdev);
 248         }
 249
 250         rtnl_unlock();
 251 }
 252
 253 /* Returned bss is reference counted and must be cleaned up appropriately. */
 254 static struct cfg80211_bss *cfg80211_get_conn_bss(struct wireless_dev *wdev)
 255 {
 256         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 257         struct cfg80211_bss *bss;
 258         u16 capa = WLAN_CAPABILITY_ESS;
 259
 260         ASSERT_WDEV_LOCK(wdev);
 261
 262         if (wdev->conn->params.privacy)
 263                 capa |= WLAN_CAPABILITY_PRIVACY;
 264
 265         bss = cfg80211_get_bss(wdev->wiphy, wdev->conn->params.channel,
 266                                wdev->conn->params.bssid,
 267                                wdev->conn->params.ssid,
 268                                wdev->conn->params.ssid_len,
 269                                WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_PRIVACY,
 270                                capa);
 271         if (!bss)
 272                 return NULL;
 273
 274         memcpy(wdev->conn->bssid, bss->bssid, ETH_ALEN);
 275         wdev->conn->params.bssid = wdev->conn->bssid;
 276         wdev->conn->params.channel = bss->channel;
 277         wdev->conn->state = CFG80211_CONN_AUTHENTICATE_NEXT;
 278         schedule_work(&rdev->conn_work);
 279
 280         return bss;
 281 }
 282
 283 static void __cfg80211_sme_scan_done(struct net_device *dev)
 284 {
 285         struct wireless_dev *wdev = dev->ieee80211_ptr;
 286         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 287         struct cfg80211_bss *bss;
 288
 289         ASSERT_WDEV_LOCK(wdev);
 290
 291         if (!wdev->conn)
 292                 return;
 293
 294         if (wdev->conn->state != CFG80211_CONN_SCANNING &&
 295             wdev->conn->state != CFG80211_CONN_SCAN_AGAIN)
 296                 return;
 297
 298         bss = cfg80211_get_conn_bss(wdev);
 299         if (bss)
 300                 cfg80211_put_bss(&rdev->wiphy, bss);
 301         else
 302                 schedule_work(&rdev->conn_work);
 303 }
 304
 305 void cfg80211_sme_scan_done(struct net_device *dev)
 306 {
 307         struct wireless_dev *wdev = dev->ieee80211_ptr;
 308
 309         wdev_lock(wdev);
 310         __cfg80211_sme_scan_done(dev);
 311         wdev_unlock(wdev);
 312 }
 313
 314 void cfg80211_sme_rx_auth(struct wireless_dev *wdev, const u8 *buf, size_t len)
 315 {
 316         struct wiphy *wiphy = wdev->wiphy;
 317         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 318         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)buf;
 319         u16 status_code = le16_to_cpu(mgmt->u.auth.status_code);
 320
 321         ASSERT_WDEV_LOCK(wdev);
 322
 323         if (!wdev->conn || wdev->conn->state == CFG80211_CONN_CONNECTED)
 324                 return;
 325
 326         if (status_code == WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG &&
 327             wdev->conn->auto_auth &&
 328             wdev->conn->params.auth_type != NL80211_AUTHTYPE_NETWORK_EAP) {
 329                 /* select automatically between only open, shared, leap */
 330                 switch (wdev->conn->params.auth_type) {
 331                 case NL80211_AUTHTYPE_OPEN_SYSTEM:
 332                         if (wdev->connect_keys)
 333                                 wdev->conn->params.auth_type =
 334                                         NL80211_AUTHTYPE_SHARED_KEY;
 335                         else
 336                                 wdev->conn->params.auth_type =
 337                                         NL80211_AUTHTYPE_NETWORK_EAP;
 338                         break;
 339                 case NL80211_AUTHTYPE_SHARED_KEY:
 340                         wdev->conn->params.auth_type =
 341                                 NL80211_AUTHTYPE_NETWORK_EAP;
 342                         break;
 343                 default:
 344                         /* huh? */
 345                         wdev->conn->params.auth_type =
 346                                 NL80211_AUTHTYPE_OPEN_SYSTEM;
 347                         break;
 348                 }
 349                 wdev->conn->state = CFG80211_CONN_AUTHENTICATE_NEXT;
 350                 schedule_work(&rdev->conn_work);
 351         } else if (status_code != WLAN_STATUS_SUCCESS) {
 352                 __cfg80211_connect_result(wdev->netdev, mgmt->bssid,
 353                                           NULL, 0, NULL, 0,
 354                                           status_code, false, NULL);
 355         } else if (wdev->conn->state == CFG80211_CONN_AUTHENTICATING) {
 356                 wdev->conn->state = CFG80211_CONN_ASSOCIATE_NEXT;
 357                 schedule_work(&rdev->conn_work);
 358         }
 359 }
 360
 361 bool cfg80211_sme_rx_assoc_resp(struct wireless_dev *wdev, u16 status)
 362 {
 363         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 364
 365         if (!wdev->conn)
 366                 return false;
 367
 368         if (status == WLAN_STATUS_SUCCESS) {
 369                 wdev->conn->state = CFG80211_CONN_CONNECTED;
 370                 return false;
 371         }
 372
 373         if (wdev->conn->prev_bssid_valid) {
 374                 /*
 375                  * Some stupid APs don't accept reassoc, so we
 376                  * need to fall back to trying regular assoc;
 377                  * return true so no event is sent to userspace.
 378                  */
 379                 wdev->conn->prev_bssid_valid = false;
 380                 wdev->conn->state = CFG80211_CONN_ASSOCIATE_NEXT;
 381                 schedule_work(&rdev->conn_work);
 382                 return true;
 383         }
 384
 385         wdev->conn->state = CFG80211_CONN_ASSOC_FAILED;
 386         schedule_work(&rdev->conn_work);
 387         return false;
 388 }
 389
 390 void cfg80211_sme_deauth(struct wireless_dev *wdev)
 391 {
 392         cfg80211_sme_free(wdev);
 393 }
 394
 395 void cfg80211_sme_auth_timeout(struct wireless_dev *wdev)
 396 {
 397         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 398
 399         if (!wdev->conn)
 400                 return;
 401
 402         wdev->conn->state = CFG80211_CONN_AUTH_FAILED;
 403         schedule_work(&rdev->conn_work);
 404 }
 405
 406 void cfg80211_sme_disassoc(struct wireless_dev *wdev)
 407 {
 408         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 409
 410         if (!wdev->conn)
 411                 return;
 412
 413         wdev->conn->state = CFG80211_CONN_DEAUTH;
 414         schedule_work(&rdev->conn_work);
 415 }
 416
 417 void cfg80211_sme_assoc_timeout(struct wireless_dev *wdev)
 418 {
 419         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 420
 421         if (!wdev->conn)
 422                 return;
 423
 424         wdev->conn->state = CFG80211_CONN_ASSOC_FAILED;
 425         schedule_work(&rdev->conn_work);
 426 }
 427
 428 static int cfg80211_sme_connect(struct wireless_dev *wdev,
 429                                 struct cfg80211_connect_params *connect,
 430                                 const u8 *prev_bssid)
 431 {
 432         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 433         struct cfg80211_bss *bss;
 434         int err;
 435
 436         if (!rdev->ops->auth || !rdev->ops->assoc)
 437                 return -EOPNOTSUPP;
 438
 439         if (wdev->current_bss)
 440                 return -EALREADY;
 441
 442         if (WARN_ON(wdev->conn))
 443                 return -EINPROGRESS;
 444
 445         wdev->conn = kzalloc(sizeof(*wdev->conn), GFP_KERNEL);
 446         if (!wdev->conn)
 447                 return -ENOMEM;
 448
 449         /*
 450          * Copy all parameters, and treat explicitly IEs, BSSID, SSID.
 451          */
 452         memcpy(&wdev->conn->params, connect, sizeof(*connect));
 453         if (connect->bssid) {
 454                 wdev->conn->params.bssid = wdev->conn->bssid;
 455                 memcpy(wdev->conn->bssid, connect->bssid, ETH_ALEN);
 456         }
 457
 458         if (connect->ie) {
 459                 wdev->conn->ie = kmemdup(connect->ie, connect->ie_len,
 460                                         GFP_KERNEL);
 461                 wdev->conn->params.ie = wdev->conn->ie;
 462                 if (!wdev->conn->ie) {
 463                         kfree(wdev->conn);
 464                         wdev->conn = NULL;
 465                         return -ENOMEM;
 466                 }
 467         }
 468
 469         if (connect->auth_type == NL80211_AUTHTYPE_AUTOMATIC) {
 470                 wdev->conn->auto_auth = true;
 471                 /* start with open system ... should mostly work */
 472                 wdev->conn->params.auth_type =
 473                         NL80211_AUTHTYPE_OPEN_SYSTEM;
 474         } else {
 475                 wdev->conn->auto_auth = false;
 476         }
 477
 478         wdev->conn->params.ssid = wdev->ssid;
 479         wdev->conn->params.ssid_len = connect->ssid_len;
 480
 481         /* see if we have the bss already */
 482         bss = cfg80211_get_conn_bss(wdev);
 483
 484         if (prev_bssid) {
 485                 memcpy(wdev->conn->prev_bssid, prev_bssid, ETH_ALEN);
 486                 wdev->conn->prev_bssid_valid = true;
 487         }
 488
 489         /* we're good if we have a matching bss struct */
 490         if (bss) {
 491                 wdev->conn->state = CFG80211_CONN_AUTHENTICATE_NEXT;
 492                 err = cfg80211_conn_do_work(wdev);
 493                 cfg80211_put_bss(wdev->wiphy, bss);
 494         } else {
 495                 /* otherwise we'll need to scan for the AP first */
 496                 err = cfg80211_conn_scan(wdev);
 497
 498                 /*
 499                  * If we can't scan right now, then we need to scan again
 500                  * after the current scan finished, since the parameters
 501                  * changed (unless we find a good AP anyway).
 502                  */
 503                 if (err == -EBUSY) {
 504                         err = 0;
 505                         wdev->conn->state = CFG80211_CONN_SCAN_AGAIN;
 506                 }
 507         }
 508
 509         if (err)
 510                 cfg80211_sme_free(wdev);
 511
 512         return err;
 513 }
 514
 515 static int cfg80211_sme_disconnect(struct wireless_dev *wdev, u16 reason)
 516 {
 517         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 518         int err;
 519
 520         if (!wdev->conn)
 521                 return 0;
 522
 523         if (!rdev->ops->deauth)
 524                 return -EOPNOTSUPP;
 525
 526         if (wdev->conn->state == CFG80211_CONN_SCANNING ||
 527             wdev->conn->state == CFG80211_CONN_SCAN_AGAIN) {
 528                 err = 0;
 529                 goto out;
 530         }
 531
 532         /* wdev->conn->params.bssid must be set if > SCANNING */
 533         err = cfg80211_mlme_deauth(rdev, wdev->netdev,
 534                                    wdev->conn->params.bssid,
 535                                    NULL, 0, reason, false);
 536  out:
 537         cfg80211_sme_free(wdev);
 538         return err;
 539 }
 540
 541 /*
 542  * code shared for in-device and software SME
 543  */
 544
 545 static bool cfg80211_is_all_idle(void)
 546 {
 547         struct cfg80211_registered_device *rdev;
 548         struct wireless_dev *wdev;
 549         bool is_all_idle = true;
 550
 551         /*
 552          * All devices must be idle as otherwise if you are actively
 553          * scanning some new beacon hints could be learned and would
 554          * count as new regulatory hints.
 555          */
 556         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
 557                 list_for_each_entry(wdev, &rdev->wdev_list, list) {
 558                         wdev_lock(wdev);
 559                         if (wdev->conn || wdev->current_bss)
 560                                 is_all_idle = false;
 561                         wdev_unlock(wdev);
 562                 }
 563         }
 564
 565         return is_all_idle;
 566 }
 567
 568 static void disconnect_work(struct work_struct *work)
 569 {
 570         rtnl_lock();
 571         if (cfg80211_is_all_idle())
 572                 regulatory_hint_disconnect();
 573         rtnl_unlock();
 574 }
 575
 576 static DECLARE_WORK(cfg80211_disconnect_work, disconnect_work);
 577
 578
 579 /*
 580  * API calls for drivers implementing connect/disconnect and
 581  * SME event handling
 582  */
 583
 584 /* This method must consume bss one way or another */
 585 void __cfg80211_connect_result(struct net_device *dev, const u8 *bssid,
 586                                const u8 *req_ie, size_t req_ie_len,
 587                                const u8 *resp_ie, size_t resp_ie_len,
 588                                u16 status, bool wextev,
 589                                struct cfg80211_bss *bss)
 590 {
 591         struct wireless_dev *wdev = dev->ieee80211_ptr;
 592         const u8 *country_ie;
 593 #ifdef CONFIG_CFG80211_WEXT
 594         union iwreq_data wrqu;
 595 #endif
 596
 597         ASSERT_WDEV_LOCK(wdev);
 598
 599         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION &&
 600                     wdev->iftype != NL80211_IFTYPE_P2P_CLIENT)) {
 601                 cfg80211_put_bss(wdev->wiphy, bss);
 602                 return;
 603         }
 604
 605         nl80211_send_connect_result(wiphy_to_dev(wdev->wiphy), dev,
 606                                     bssid, req_ie, req_ie_len,
 607                                     resp_ie, resp_ie_len,
 608                                     status, GFP_KERNEL);
 609
 610 #ifdef CONFIG_CFG80211_WEXT
 611         if (wextev) {
 612                 if (req_ie && status == WLAN_STATUS_SUCCESS) {
 613                         memset(&wrqu, 0, sizeof(wrqu));
 614                         wrqu.data.length = req_ie_len;
 615                         wireless_send_event(dev, IWEVASSOCREQIE, &wrqu, req_ie);
 616                 }
 617
 618                 if (resp_ie && status == WLAN_STATUS_SUCCESS) {
 619                         memset(&wrqu, 0, sizeof(wrqu));
 620                         wrqu.data.length = resp_ie_len;
 621                         wireless_send_event(dev, IWEVASSOCRESPIE, &wrqu, resp_ie);
 622                 }
 623
 624                 memset(&wrqu, 0, sizeof(wrqu));
 625                 wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 626                 if (bssid && status == WLAN_STATUS_SUCCESS) {
 627                         memcpy(wrqu.ap_addr.sa_data, bssid, ETH_ALEN);
 628                         memcpy(wdev->wext.prev_bssid, bssid, ETH_ALEN);
 629                         wdev->wext.prev_bssid_valid = true;
 630                 }
 631                 wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL);
 632         }
 633 #endif
 634
 635         if (wdev->current_bss) {
 636                 cfg80211_unhold_bss(wdev->current_bss);
 637                 cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
 638                 wdev->current_bss = NULL;
 639         }
 640
 641         if (status != WLAN_STATUS_SUCCESS) {
 642                 kfree(wdev->connect_keys);
 643                 wdev->connect_keys = NULL;
 644                 wdev->ssid_len = 0;
 645                 if (bss) {
 646                         cfg80211_unhold_bss(bss_from_pub(bss));
 647                         cfg80211_put_bss(wdev->wiphy, bss);
 648                 }
 649                 return;
 650         }
 651
 652         if (!bss) {
 653                 WARN_ON_ONCE(!wiphy_to_dev(wdev->wiphy)->ops->connect);
 654                 bss = cfg80211_get_bss(wdev->wiphy, NULL, bssid,
 655                                        wdev->ssid, wdev->ssid_len,
 656                                        WLAN_CAPABILITY_ESS,
 657                                        WLAN_CAPABILITY_ESS);
 658                 if (WARN_ON(!bss))
 659                         return;
 660                 cfg80211_hold_bss(bss_from_pub(bss));
 661         }
 662
 663         wdev->current_bss = bss_from_pub(bss);
 664
 665         cfg80211_upload_connect_keys(wdev);
 666
 667         rcu_read_lock();
 668         country_ie = ieee80211_bss_get_ie(bss, WLAN_EID_COUNTRY);
 669         if (!country_ie) {
 670                 rcu_read_unlock();
 671                 return;
 672         }
 673
 674         country_ie = kmemdup(country_ie, 2 + country_ie[1], GFP_ATOMIC);
 675         rcu_read_unlock();
 676
 677         if (!country_ie)
 678                 return;
 679
 680         /*
 681          * ieee80211_bss_get_ie() ensures we can access:
 682          * - country_ie + 2, the start of the country ie data, and
 683          * - and country_ie[1] which is the IE length
 684          */
 685         regulatory_hint_11d(wdev->wiphy, bss->channel->band,
 686                             country_ie + 2, country_ie[1]);
 687         kfree(country_ie);
 688 }
 689
 690 void cfg80211_connect_result(struct net_device *dev, const u8 *bssid,
 691                              const u8 *req_ie, size_t req_ie_len,
 692                              const u8 *resp_ie, size_t resp_ie_len,
 693                              u16 status, gfp_t gfp)
 694 {
 695         struct wireless_dev *wdev = dev->ieee80211_ptr;
 696         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 697         struct cfg80211_event *ev;
 698         unsigned long flags;
 699
 700         ev = kzalloc(sizeof(*ev) + req_ie_len + resp_ie_len, gfp);
 701         if (!ev)
 702                 return;
 703
 704         ev->type = EVENT_CONNECT_RESULT;
 705         if (bssid)
 706                 memcpy(ev->cr.bssid, bssid, ETH_ALEN);
 707         if (req_ie_len) {
 708                 ev->cr.req_ie = ((u8 *)ev) + sizeof(*ev);
 709                 ev->cr.req_ie_len = req_ie_len;
 710                 memcpy((void *)ev->cr.req_ie, req_ie, req_ie_len);
 711         }
 712         if (resp_ie_len) {
 713                 ev->cr.resp_ie = ((u8 *)ev) + sizeof(*ev) + req_ie_len;
 714                 ev->cr.resp_ie_len = resp_ie_len;
 715                 memcpy((void *)ev->cr.resp_ie, resp_ie, resp_ie_len);
 716         }
 717         ev->cr.status = status;
 718
 719         spin_lock_irqsave(&wdev->event_lock, flags);
 720         list_add_tail(&ev->list, &wdev->event_list);
 721         spin_unlock_irqrestore(&wdev->event_lock, flags);
 722         queue_work(cfg80211_wq, &rdev->event_work);
 723 }
 724 EXPORT_SYMBOL(cfg80211_connect_result);
 725
 726 /* Consumes bss object one way or another */
 727 void __cfg80211_roamed(struct wireless_dev *wdev,
 728                        struct cfg80211_bss *bss,
 729                        const u8 *req_ie, size_t req_ie_len,
 730                        const u8 *resp_ie, size_t resp_ie_len)
 731 {
 732 #ifdef CONFIG_CFG80211_WEXT
 733         union iwreq_data wrqu;
 734 #endif
 735         ASSERT_WDEV_LOCK(wdev);
 736
 737         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION &&
 738                     wdev->iftype != NL80211_IFTYPE_P2P_CLIENT))
 739                 goto out;
 740
 741         if (WARN_ON(!wdev->current_bss))
 742                 goto out;
 743
 744         cfg80211_unhold_bss(wdev->current_bss);
 745         cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
 746         wdev->current_bss = NULL;
 747
 748         cfg80211_hold_bss(bss_from_pub(bss));
 749         wdev->current_bss = bss_from_pub(bss);
 750
 751         nl80211_send_roamed(wiphy_to_dev(wdev->wiphy), wdev->netdev, bss->bssid,
 752                             req_ie, req_ie_len, resp_ie, resp_ie_len,
 753                             GFP_KERNEL);
 754
 755 #ifdef CONFIG_CFG80211_WEXT
 756         if (req_ie) {
 757                 memset(&wrqu, 0, sizeof(wrqu));
 758                 wrqu.data.length = req_ie_len;
 759                 wireless_send_event(wdev->netdev, IWEVASSOCREQIE,
 760                                     &wrqu, req_ie);
 761         }
 762
 763         if (resp_ie) {
 764                 memset(&wrqu, 0, sizeof(wrqu));
 765                 wrqu.data.length = resp_ie_len;
 766                 wireless_send_event(wdev->netdev, IWEVASSOCRESPIE,
 767                                     &wrqu, resp_ie);
 768         }
 769
 770         memset(&wrqu, 0, sizeof(wrqu));
 771         wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 772         memcpy(wrqu.ap_addr.sa_data, bss->bssid, ETH_ALEN);
 773         memcpy(wdev->wext.prev_bssid, bss->bssid, ETH_ALEN);
 774         wdev->wext.prev_bssid_valid = true;
 775         wireless_send_event(wdev->netdev, SIOCGIWAP, &wrqu, NULL);
 776 #endif
 777
 778         return;
 779 out:
 780         cfg80211_put_bss(wdev->wiphy, bss);
 781 }
 782
 783 void cfg80211_roamed(struct net_device *dev,
 784                      struct ieee80211_channel *channel,
 785                      const u8 *bssid,
 786                      const u8 *req_ie, size_t req_ie_len,
 787                      const u8 *resp_ie, size_t resp_ie_len, gfp_t gfp)
 788 {
 789         struct wireless_dev *wdev = dev->ieee80211_ptr;
 790         struct cfg80211_bss *bss;
 791
 792         bss = cfg80211_get_bss(wdev->wiphy, channel, bssid, wdev->ssid,
 793                                wdev->ssid_len, WLAN_CAPABILITY_ESS,
 794                                WLAN_CAPABILITY_ESS);
 795         if (WARN_ON(!bss))
 796                 return;
 797
 798         cfg80211_roamed_bss(dev, bss, req_ie, req_ie_len, resp_ie,
 799                             resp_ie_len, gfp);
 800 }
 801 EXPORT_SYMBOL(cfg80211_roamed);
 802
 803 /* Consumes bss object one way or another */
 804 void cfg80211_roamed_bss(struct net_device *dev,
 805                          struct cfg80211_bss *bss, const u8 *req_ie,
 806                          size_t req_ie_len, const u8 *resp_ie,
 807                          size_t resp_ie_len, gfp_t gfp)
 808 {
 809         struct wireless_dev *wdev = dev->ieee80211_ptr;
 810         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 811         struct cfg80211_event *ev;
 812         unsigned long flags;
 813
 814         if (WARN_ON(!bss))
 815                 return;
 816
 817         ev = kzalloc(sizeof(*ev) + req_ie_len + resp_ie_len, gfp);
 818         if (!ev) {
 819                 cfg80211_put_bss(wdev->wiphy, bss);
 820                 return;
 821         }
 822
 823         ev->type = EVENT_ROAMED;
 824         ev->rm.req_ie = ((u8 *)ev) + sizeof(*ev);
 825         ev->rm.req_ie_len = req_ie_len;
 826         memcpy((void *)ev->rm.req_ie, req_ie, req_ie_len);
 827         ev->rm.resp_ie = ((u8 *)ev) + sizeof(*ev) + req_ie_len;
 828         ev->rm.resp_ie_len = resp_ie_len;
 829         memcpy((void *)ev->rm.resp_ie, resp_ie, resp_ie_len);
 830         ev->rm.bss = bss;
 831
 832         spin_lock_irqsave(&wdev->event_lock, flags);
 833         list_add_tail(&ev->list, &wdev->event_list);
 834         spin_unlock_irqrestore(&wdev->event_lock, flags);
 835         queue_work(cfg80211_wq, &rdev->event_work);
 836 }
 837 EXPORT_SYMBOL(cfg80211_roamed_bss);
 838
 839 void __cfg80211_disconnected(struct net_device *dev, const u8 *ie,
 840                              size_t ie_len, u16 reason, bool from_ap)
 841 {
 842         struct wireless_dev *wdev = dev->ieee80211_ptr;
 843         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 844         int i;
 845 #ifdef CONFIG_CFG80211_WEXT
 846         union iwreq_data wrqu;
 847 #endif
 848
 849         ASSERT_WDEV_LOCK(wdev);
 850
 851         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION &&
 852                     wdev->iftype != NL80211_IFTYPE_P2P_CLIENT))
 853                 return;
 854
 855         if (wdev->current_bss) {
 856                 cfg80211_unhold_bss(wdev->current_bss);
 857                 cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
 858         }
 859
 860         wdev->current_bss = NULL;
 861         wdev->ssid_len = 0;
 862
 863         nl80211_send_disconnected(rdev, dev, reason, ie, ie_len, from_ap);
 864
 865         /*
 866          * Delete all the keys ... pairwise keys can't really
 867          * exist any more anyway, but default keys might.
 868          */
 869         if (rdev->ops->del_key)
 870                 for (i = 0; i < 6; i++)
 871                         rdev_del_key(rdev, dev, i, false, NULL);
 872
 873 #ifdef CONFIG_CFG80211_WEXT
 874         memset(&wrqu, 0, sizeof(wrqu));
 875         wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 876         wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL);
 877         wdev->wext.connect.ssid_len = 0;
 878 #endif
 879
 880         schedule_work(&cfg80211_disconnect_work);
 881 }
 882
 883 void cfg80211_disconnected(struct net_device *dev, u16 reason,
 884                            u8 *ie, size_t ie_len, gfp_t gfp)
 885 {
 886         struct wireless_dev *wdev = dev->ieee80211_ptr;
 887         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 888         struct cfg80211_event *ev;
 889         unsigned long flags;
 890
 891         ev = kzalloc(sizeof(*ev) + ie_len, gfp);
 892         if (!ev)
 893                 return;
 894
 895         ev->type = EVENT_DISCONNECTED;
 896         ev->dc.ie = ((u8 *)ev) + sizeof(*ev);
 897         ev->dc.ie_len = ie_len;
 898         memcpy((void *)ev->dc.ie, ie, ie_len);
 899         ev->dc.reason = reason;
 900
 901         spin_lock_irqsave(&wdev->event_lock, flags);
 902         list_add_tail(&ev->list, &wdev->event_list);
 903         spin_unlock_irqrestore(&wdev->event_lock, flags);
 904         queue_work(cfg80211_wq, &rdev->event_work);
 905 }
 906 EXPORT_SYMBOL(cfg80211_disconnected);
 907
 908 /*
 909  * API calls for nl80211/wext compatibility code
 910  */
 911 int cfg80211_connect(struct cfg80211_registered_device *rdev,
 912                      struct net_device *dev,
 913                      struct cfg80211_connect_params *connect,
 914                      struct cfg80211_cached_keys *connkeys,
 915                      const u8 *prev_bssid)
 916 {
 917         struct wireless_dev *wdev = dev->ieee80211_ptr;
 918         int err;
 919
 920         ASSERT_WDEV_LOCK(wdev);
 921
 922         if (WARN_ON(wdev->connect_keys)) {
 923                 kfree(wdev->connect_keys);
 924                 wdev->connect_keys = NULL;
 925         }
 926
 927         cfg80211_oper_and_ht_capa(&connect->ht_capa_mask,
 928                                   rdev->wiphy.ht_capa_mod_mask);
 929
 930         if (connkeys && connkeys->def >= 0) {
 931                 int idx;
 932                 u32 cipher;
 933
 934                 idx = connkeys->def;
 935                 cipher = connkeys->params[idx].cipher;
 936                 /* If given a WEP key we may need it for shared key auth */
 937                 if (cipher == WLAN_CIPHER_SUITE_WEP40 ||
 938                     cipher == WLAN_CIPHER_SUITE_WEP104) {
 939                         connect->key_idx = idx;
 940                         connect->key = connkeys->params[idx].key;
 941                         connect->key_len = connkeys->params[idx].key_len;
 942
 943                         /*
 944                          * If ciphers are not set (e.g. when going through
 945                          * iwconfig), we have to set them appropriately here.
 946                          */
 947                         if (connect->crypto.cipher_group == 0)
 948                                 connect->crypto.cipher_group = cipher;
 949
 950                         if (connect->crypto.n_ciphers_pairwise == 0) {
 951                                 connect->crypto.n_ciphers_pairwise = 1;
 952                                 connect->crypto.ciphers_pairwise[0] = cipher;
 953                         }
 954                 }
 955         }
 956
 957         wdev->connect_keys = connkeys;
 958         memcpy(wdev->ssid, connect->ssid, connect->ssid_len);
 959         wdev->ssid_len = connect->ssid_len;
 960
 961         if (!rdev->ops->connect)
 962                 err = cfg80211_sme_connect(wdev, connect, prev_bssid);
 963         else
 964                 err = rdev_connect(rdev, dev, connect);
 965
 966         if (err) {
 967                 wdev->connect_keys = NULL;
 968                 wdev->ssid_len = 0;
 969                 return err;
 970         }
 971
 972         return 0;
 973 }
 974
 975 int cfg80211_disconnect(struct cfg80211_registered_device *rdev,
 976                         struct net_device *dev, u16 reason, bool wextev)
 977 {
 978         struct wireless_dev *wdev = dev->ieee80211_ptr;
 979         int err = 0;
 980
 981         ASSERT_WDEV_LOCK(wdev);
 982
 983         kfree(wdev->connect_keys);
 984         wdev->connect_keys = NULL;
 985
 986         if (wdev->conn)
 987                 err = cfg80211_sme_disconnect(wdev, reason);
 988         else if (!rdev->ops->disconnect)
 989                 cfg80211_mlme_down(rdev, dev);
 990         else if (wdev->current_bss)
 991                 err = rdev_disconnect(rdev, dev, reason);
 992
 993         return err;
 994 }