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 || rdev->scan_msg)
  71                 return -EBUSY;
  72
  73         if (wdev->conn->params.channel)
  74                 n_channels = 1;
  75         else
  76                 n_channels = ieee80211_get_num_supported_channels(wdev->wiphy);
  77
  78         request = kzalloc(sizeof(*request) + sizeof(request->ssids[0]) +
  79                           sizeof(request->channels[0]) * n_channels,
  80                           GFP_KERNEL);
  81         if (!request)
  82                 return -ENOMEM;
  83
  84         if (wdev->conn->params.channel)
  85                 request->channels[0] = wdev->conn->params.channel;
  86         else {
  87                 int i = 0, j;
  88                 enum ieee80211_band band;
  89                 struct ieee80211_supported_band *bands;
  90                 struct ieee80211_channel *channel;
  91
  92                 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
  93                         bands = wdev->wiphy->bands[band];
  94                         if (!bands)
  95                                 continue;
  96                         for (j = 0; j < bands->n_channels; j++) {
  97                                 channel = &bands->channels[j];
  98                                 if (channel->flags & IEEE80211_CHAN_DISABLED)
  99                                         continue;
 100                                 request->channels[i++] = channel;
 101                         }
 102                         request->rates[band] = (1 << bands->n_bitrates) - 1;
 103                 }
 104                 n_channels = i;
 105         }
 106         request->n_channels = n_channels;
 107         request->ssids = (void *)&request->channels[n_channels];
 108         request->n_ssids = 1;
 109
 110         memcpy(request->ssids[0].ssid, wdev->conn->params.ssid,
 111                 wdev->conn->params.ssid_len);
 112         request->ssids[0].ssid_len = wdev->conn->params.ssid_len;
 113
 114         request->wdev = wdev;
 115         request->wiphy = &rdev->wiphy;
 116         request->scan_start = jiffies;
 117
 118         rdev->scan_req = request;
 119
 120         err = rdev_scan(rdev, request);
 121         if (!err) {
 122                 wdev->conn->state = CFG80211_CONN_SCANNING;
 123                 nl80211_send_scan_start(rdev, wdev);
 124                 dev_hold(wdev->netdev);
 125         } else {
 126                 rdev->scan_req = NULL;
 127                 kfree(request);
 128         }
 129         return err;
 130 }
 131
 132 static int cfg80211_conn_do_work(struct wireless_dev *wdev)
 133 {
 134         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 135         struct cfg80211_connect_params *params;
 136         struct cfg80211_assoc_request req = {};
 137         int err;
 138
 139         ASSERT_WDEV_LOCK(wdev);
 140
 141         if (!wdev->conn)
 142                 return 0;
 143
 144         params = &wdev->conn->params;
 145
 146         switch (wdev->conn->state) {
 147         case CFG80211_CONN_SCANNING:
 148                 /* didn't find it during scan ... */
 149                 return -ENOENT;
 150         case CFG80211_CONN_SCAN_AGAIN:
 151                 return cfg80211_conn_scan(wdev);
 152         case CFG80211_CONN_AUTHENTICATE_NEXT:
 153                 BUG_ON(!rdev->ops->auth);
 154                 wdev->conn->state = CFG80211_CONN_AUTHENTICATING;
 155                 return cfg80211_mlme_auth(rdev, wdev->netdev,
 156                                           params->channel, params->auth_type,
 157                                           params->bssid,
 158                                           params->ssid, params->ssid_len,
 159                                           NULL, 0,
 160                                           params->key, params->key_len,
 161                                           params->key_idx, NULL, 0);
 162         case CFG80211_CONN_AUTH_FAILED:
 163                 return -ENOTCONN;
 164         case CFG80211_CONN_ASSOCIATE_NEXT:
 165                 BUG_ON(!rdev->ops->assoc);
 166                 wdev->conn->state = CFG80211_CONN_ASSOCIATING;
 167                 if (wdev->conn->prev_bssid_valid)
 168                         req.prev_bssid = wdev->conn->prev_bssid;
 169                 req.ie = params->ie;
 170                 req.ie_len = params->ie_len;
 171                 req.use_mfp = params->mfp != NL80211_MFP_NO;
 172                 req.crypto = params->crypto;
 173                 req.flags = params->flags;
 174                 req.ht_capa = params->ht_capa;
 175                 req.ht_capa_mask = params->ht_capa_mask;
 176                 req.vht_capa = params->vht_capa;
 177                 req.vht_capa_mask = params->vht_capa_mask;
 178
 179                 err = cfg80211_mlme_assoc(rdev, wdev->netdev, params->channel,
 180                                           params->bssid, params->ssid,
 181                                           params->ssid_len, &req);
 182                 if (err)
 183                         cfg80211_mlme_deauth(rdev, wdev->netdev, params->bssid,
 184                                              NULL, 0,
 185                                              WLAN_REASON_DEAUTH_LEAVING,
 186                                              false);
 187                 return err;
 188         case CFG80211_CONN_ASSOC_FAILED:
 189                 cfg80211_mlme_deauth(rdev, wdev->netdev, params->bssid,
 190                                      NULL, 0,
 191                                      WLAN_REASON_DEAUTH_LEAVING, false);
 192                 return -ENOTCONN;
 193         case CFG80211_CONN_DEAUTH:
 194                 cfg80211_mlme_deauth(rdev, wdev->netdev, params->bssid,
 195                                      NULL, 0,
 196                                      WLAN_REASON_DEAUTH_LEAVING, false);
 197                 /* free directly, disconnected event already sent */
 198                 cfg80211_sme_free(wdev);
 199                 return 0;
 200         default:
 201                 return 0;
 202         }
 203 }
 204
 205 void cfg80211_conn_work(struct work_struct *work)
 206 {
 207         struct cfg80211_registered_device *rdev =
 208                 container_of(work, struct cfg80211_registered_device, conn_work);
 209         struct wireless_dev *wdev;
 210         u8 bssid_buf[ETH_ALEN], *bssid = NULL;
 211
 212         rtnl_lock();
 213
 214         list_for_each_entry(wdev, &rdev->wdev_list, list) {
 215                 if (!wdev->netdev)
 216                         continue;
 217
 218                 wdev_lock(wdev);
 219                 if (!netif_running(wdev->netdev)) {
 220                         wdev_unlock(wdev);
 221                         continue;
 222                 }
 223                 if (!wdev->conn ||
 224                     wdev->conn->state == CFG80211_CONN_CONNECTED) {
 225                         wdev_unlock(wdev);
 226                         continue;
 227                 }
 228                 if (wdev->conn->params.bssid) {
 229                         memcpy(bssid_buf, wdev->conn->params.bssid, ETH_ALEN);
 230                         bssid = bssid_buf;
 231                 }
 232                 if (cfg80211_conn_do_work(wdev)) {
 233                         __cfg80211_connect_result(
 234                                         wdev->netdev, bssid,
 235                                         NULL, 0, NULL, 0,
 236                                         WLAN_STATUS_UNSPECIFIED_FAILURE,
 237                                         false, NULL);
 238                         cfg80211_sme_free(wdev);
 239                 }
 240                 wdev_unlock(wdev);
 241         }
 242
 243         rtnl_unlock();
 244 }
 245
 246 /* Returned bss is reference counted and must be cleaned up appropriately. */
 247 static struct cfg80211_bss *cfg80211_get_conn_bss(struct wireless_dev *wdev)
 248 {
 249         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 250         struct cfg80211_bss *bss;
 251         u16 capa = WLAN_CAPABILITY_ESS;
 252
 253         ASSERT_WDEV_LOCK(wdev);
 254
 255         if (wdev->conn->params.privacy)
 256                 capa |= WLAN_CAPABILITY_PRIVACY;
 257
 258         bss = cfg80211_get_bss(wdev->wiphy, wdev->conn->params.channel,
 259                                wdev->conn->params.bssid,
 260                                wdev->conn->params.ssid,
 261                                wdev->conn->params.ssid_len,
 262                                WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_PRIVACY,
 263                                capa);
 264         if (!bss)
 265                 return NULL;
 266
 267         memcpy(wdev->conn->bssid, bss->bssid, ETH_ALEN);
 268         wdev->conn->params.bssid = wdev->conn->bssid;
 269         wdev->conn->params.channel = bss->channel;
 270         wdev->conn->state = CFG80211_CONN_AUTHENTICATE_NEXT;
 271         schedule_work(&rdev->conn_work);
 272
 273         return bss;
 274 }
 275
 276 static void __cfg80211_sme_scan_done(struct net_device *dev)
 277 {
 278         struct wireless_dev *wdev = dev->ieee80211_ptr;
 279         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 280         struct cfg80211_bss *bss;
 281
 282         ASSERT_WDEV_LOCK(wdev);
 283
 284         if (!wdev->conn)
 285                 return;
 286
 287         if (wdev->conn->state != CFG80211_CONN_SCANNING &&
 288             wdev->conn->state != CFG80211_CONN_SCAN_AGAIN)
 289                 return;
 290
 291         bss = cfg80211_get_conn_bss(wdev);
 292         if (bss)
 293                 cfg80211_put_bss(&rdev->wiphy, bss);
 294         else
 295                 schedule_work(&rdev->conn_work);
 296 }
 297
 298 void cfg80211_sme_scan_done(struct net_device *dev)
 299 {
 300         struct wireless_dev *wdev = dev->ieee80211_ptr;
 301
 302         wdev_lock(wdev);
 303         __cfg80211_sme_scan_done(dev);
 304         wdev_unlock(wdev);
 305 }
 306
 307 void cfg80211_sme_rx_auth(struct wireless_dev *wdev, const u8 *buf, size_t len)
 308 {
 309         struct wiphy *wiphy = wdev->wiphy;
 310         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 311         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)buf;
 312         u16 status_code = le16_to_cpu(mgmt->u.auth.status_code);
 313
 314         ASSERT_WDEV_LOCK(wdev);
 315
 316         if (!wdev->conn || wdev->conn->state == CFG80211_CONN_CONNECTED)
 317                 return;
 318
 319         if (status_code == WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG &&
 320             wdev->conn->auto_auth &&
 321             wdev->conn->params.auth_type != NL80211_AUTHTYPE_NETWORK_EAP) {
 322                 /* select automatically between only open, shared, leap */
 323                 switch (wdev->conn->params.auth_type) {
 324                 case NL80211_AUTHTYPE_OPEN_SYSTEM:
 325                         if (wdev->connect_keys)
 326                                 wdev->conn->params.auth_type =
 327                                         NL80211_AUTHTYPE_SHARED_KEY;
 328                         else
 329                                 wdev->conn->params.auth_type =
 330                                         NL80211_AUTHTYPE_NETWORK_EAP;
 331                         break;
 332                 case NL80211_AUTHTYPE_SHARED_KEY:
 333                         wdev->conn->params.auth_type =
 334                                 NL80211_AUTHTYPE_NETWORK_EAP;
 335                         break;
 336                 default:
 337                         /* huh? */
 338                         wdev->conn->params.auth_type =
 339                                 NL80211_AUTHTYPE_OPEN_SYSTEM;
 340                         break;
 341                 }
 342                 wdev->conn->state = CFG80211_CONN_AUTHENTICATE_NEXT;
 343                 schedule_work(&rdev->conn_work);
 344         } else if (status_code != WLAN_STATUS_SUCCESS) {
 345                 __cfg80211_connect_result(wdev->netdev, mgmt->bssid,
 346                                           NULL, 0, NULL, 0,
 347                                           status_code, false, NULL);
 348         } else if (wdev->conn->state == CFG80211_CONN_AUTHENTICATING) {
 349                 wdev->conn->state = CFG80211_CONN_ASSOCIATE_NEXT;
 350                 schedule_work(&rdev->conn_work);
 351         }
 352 }
 353
 354 bool cfg80211_sme_rx_assoc_resp(struct wireless_dev *wdev, u16 status)
 355 {
 356         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 357
 358         if (!wdev->conn)
 359                 return false;
 360
 361         if (status == WLAN_STATUS_SUCCESS) {
 362                 wdev->conn->state = CFG80211_CONN_CONNECTED;
 363                 return false;
 364         }
 365
 366         if (wdev->conn->prev_bssid_valid) {
 367                 /*
 368                  * Some stupid APs don't accept reassoc, so we
 369                  * need to fall back to trying regular assoc;
 370                  * return true so no event is sent to userspace.
 371                  */
 372                 wdev->conn->prev_bssid_valid = false;
 373                 wdev->conn->state = CFG80211_CONN_ASSOCIATE_NEXT;
 374                 schedule_work(&rdev->conn_work);
 375                 return true;
 376         }
 377
 378         wdev->conn->state = CFG80211_CONN_ASSOC_FAILED;
 379         schedule_work(&rdev->conn_work);
 380         return false;
 381 }
 382
 383 void cfg80211_sme_deauth(struct wireless_dev *wdev)
 384 {
 385         cfg80211_sme_free(wdev);
 386 }
 387
 388 void cfg80211_sme_auth_timeout(struct wireless_dev *wdev)
 389 {
 390         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 391
 392         if (!wdev->conn)
 393                 return;
 394
 395         wdev->conn->state = CFG80211_CONN_AUTH_FAILED;
 396         schedule_work(&rdev->conn_work);
 397 }
 398
 399 void cfg80211_sme_disassoc(struct wireless_dev *wdev)
 400 {
 401         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 402
 403         if (!wdev->conn)
 404                 return;
 405
 406         wdev->conn->state = CFG80211_CONN_DEAUTH;
 407         schedule_work(&rdev->conn_work);
 408 }
 409
 410 void cfg80211_sme_assoc_timeout(struct wireless_dev *wdev)
 411 {
 412         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 413
 414         if (!wdev->conn)
 415                 return;
 416
 417         wdev->conn->state = CFG80211_CONN_ASSOC_FAILED;
 418         schedule_work(&rdev->conn_work);
 419 }
 420
 421 static int cfg80211_sme_connect(struct wireless_dev *wdev,
 422                                 struct cfg80211_connect_params *connect,
 423                                 const u8 *prev_bssid)
 424 {
 425         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 426         struct cfg80211_bss *bss;
 427         int err;
 428
 429         if (!rdev->ops->auth || !rdev->ops->assoc)
 430                 return -EOPNOTSUPP;
 431
 432         if (wdev->current_bss)
 433                 return -EALREADY;
 434
 435         if (WARN_ON(wdev->conn))
 436                 return -EINPROGRESS;
 437
 438         wdev->conn = kzalloc(sizeof(*wdev->conn), GFP_KERNEL);
 439         if (!wdev->conn)
 440                 return -ENOMEM;
 441
 442         /*
 443          * Copy all parameters, and treat explicitly IEs, BSSID, SSID.
 444          */
 445         memcpy(&wdev->conn->params, connect, sizeof(*connect));
 446         if (connect->bssid) {
 447                 wdev->conn->params.bssid = wdev->conn->bssid;
 448                 memcpy(wdev->conn->bssid, connect->bssid, ETH_ALEN);
 449         }
 450
 451         if (connect->ie) {
 452                 wdev->conn->ie = kmemdup(connect->ie, connect->ie_len,
 453                                         GFP_KERNEL);
 454                 wdev->conn->params.ie = wdev->conn->ie;
 455                 if (!wdev->conn->ie) {
 456                         kfree(wdev->conn);
 457                         wdev->conn = NULL;
 458                         return -ENOMEM;
 459                 }
 460         }
 461
 462         if (connect->auth_type == NL80211_AUTHTYPE_AUTOMATIC) {
 463                 wdev->conn->auto_auth = true;
 464                 /* start with open system ... should mostly work */
 465                 wdev->conn->params.auth_type =
 466                         NL80211_AUTHTYPE_OPEN_SYSTEM;
 467         } else {
 468                 wdev->conn->auto_auth = false;
 469         }
 470
 471         wdev->conn->params.ssid = wdev->ssid;
 472         wdev->conn->params.ssid_len = connect->ssid_len;
 473
 474         /* see if we have the bss already */
 475         bss = cfg80211_get_conn_bss(wdev);
 476
 477         if (prev_bssid) {
 478                 memcpy(wdev->conn->prev_bssid, prev_bssid, ETH_ALEN);
 479                 wdev->conn->prev_bssid_valid = true;
 480         }
 481
 482         /* we're good if we have a matching bss struct */
 483         if (bss) {
 484                 wdev->conn->state = CFG80211_CONN_AUTHENTICATE_NEXT;
 485                 err = cfg80211_conn_do_work(wdev);
 486                 cfg80211_put_bss(wdev->wiphy, bss);
 487         } else {
 488                 /* otherwise we'll need to scan for the AP first */
 489                 err = cfg80211_conn_scan(wdev);
 490
 491                 /*
 492                  * If we can't scan right now, then we need to scan again
 493                  * after the current scan finished, since the parameters
 494                  * changed (unless we find a good AP anyway).
 495                  */
 496                 if (err == -EBUSY) {
 497                         err = 0;
 498                         wdev->conn->state = CFG80211_CONN_SCAN_AGAIN;
 499                 }
 500         }
 501
 502         if (err)
 503                 cfg80211_sme_free(wdev);
 504
 505         return err;
 506 }
 507
 508 static int cfg80211_sme_disconnect(struct wireless_dev *wdev, u16 reason)
 509 {
 510         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 511         int err;
 512
 513         if (!wdev->conn)
 514                 return 0;
 515
 516         if (!rdev->ops->deauth)
 517                 return -EOPNOTSUPP;
 518
 519         if (wdev->conn->state == CFG80211_CONN_SCANNING ||
 520             wdev->conn->state == CFG80211_CONN_SCAN_AGAIN) {
 521                 err = 0;
 522                 goto out;
 523         }
 524
 525         /* wdev->conn->params.bssid must be set if > SCANNING */
 526         err = cfg80211_mlme_deauth(rdev, wdev->netdev,
 527                                    wdev->conn->params.bssid,
 528                                    NULL, 0, reason, false);
 529  out:
 530         cfg80211_sme_free(wdev);
 531         return err;
 532 }
 533
 534 /*
 535  * code shared for in-device and software SME
 536  */
 537
 538 static bool cfg80211_is_all_idle(void)
 539 {
 540         struct cfg80211_registered_device *rdev;
 541         struct wireless_dev *wdev;
 542         bool is_all_idle = true;
 543
 544         /*
 545          * All devices must be idle as otherwise if you are actively
 546          * scanning some new beacon hints could be learned and would
 547          * count as new regulatory hints.
 548          */
 549         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
 550                 list_for_each_entry(wdev, &rdev->wdev_list, list) {
 551                         wdev_lock(wdev);
 552                         if (wdev->conn || wdev->current_bss)
 553                                 is_all_idle = false;
 554                         wdev_unlock(wdev);
 555                 }
 556         }
 557
 558         return is_all_idle;
 559 }
 560
 561 static void disconnect_work(struct work_struct *work)
 562 {
 563         rtnl_lock();
 564         if (cfg80211_is_all_idle())
 565                 regulatory_hint_disconnect();
 566         rtnl_unlock();
 567 }
 568
 569 static DECLARE_WORK(cfg80211_disconnect_work, disconnect_work);
 570
 571
 572 /*
 573  * API calls for drivers implementing connect/disconnect and
 574  * SME event handling
 575  */
 576
 577 /* This method must consume bss one way or another */
 578 void __cfg80211_connect_result(struct net_device *dev, const u8 *bssid,
 579                                const u8 *req_ie, size_t req_ie_len,
 580                                const u8 *resp_ie, size_t resp_ie_len,
 581                                u16 status, bool wextev,
 582                                struct cfg80211_bss *bss)
 583 {
 584         struct wireless_dev *wdev = dev->ieee80211_ptr;
 585         const u8 *country_ie;
 586 #ifdef CONFIG_CFG80211_WEXT
 587         union iwreq_data wrqu;
 588 #endif
 589
 590         ASSERT_WDEV_LOCK(wdev);
 591
 592         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION &&
 593                     wdev->iftype != NL80211_IFTYPE_P2P_CLIENT)) {
 594                 cfg80211_put_bss(wdev->wiphy, bss);
 595                 return;
 596         }
 597
 598         nl80211_send_connect_result(wiphy_to_dev(wdev->wiphy), dev,
 599                                     bssid, req_ie, req_ie_len,
 600                                     resp_ie, resp_ie_len,
 601                                     status, GFP_KERNEL);
 602
 603 #ifdef CONFIG_CFG80211_WEXT
 604         if (wextev) {
 605                 if (req_ie && status == WLAN_STATUS_SUCCESS) {
 606                         memset(&wrqu, 0, sizeof(wrqu));
 607                         wrqu.data.length = req_ie_len;
 608                         wireless_send_event(dev, IWEVASSOCREQIE, &wrqu, req_ie);
 609                 }
 610
 611                 if (resp_ie && status == WLAN_STATUS_SUCCESS) {
 612                         memset(&wrqu, 0, sizeof(wrqu));
 613                         wrqu.data.length = resp_ie_len;
 614                         wireless_send_event(dev, IWEVASSOCRESPIE, &wrqu, resp_ie);
 615                 }
 616
 617                 memset(&wrqu, 0, sizeof(wrqu));
 618                 wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 619                 if (bssid && status == WLAN_STATUS_SUCCESS) {
 620                         memcpy(wrqu.ap_addr.sa_data, bssid, ETH_ALEN);
 621                         memcpy(wdev->wext.prev_bssid, bssid, ETH_ALEN);
 622                         wdev->wext.prev_bssid_valid = true;
 623                 }
 624                 wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL);
 625         }
 626 #endif
 627
 628         if (!bss && (status == WLAN_STATUS_SUCCESS)) {
 629                 WARN_ON_ONCE(!wiphy_to_dev(wdev->wiphy)->ops->connect);
 630                 bss = cfg80211_get_bss(wdev->wiphy, NULL, bssid,
 631                                        wdev->ssid, wdev->ssid_len,
 632                                        WLAN_CAPABILITY_ESS,
 633                                        WLAN_CAPABILITY_ESS);
 634                 if (bss)
 635                         cfg80211_hold_bss(bss_from_pub(bss));
 636         }
 637
 638         if (wdev->current_bss) {
 639                 cfg80211_unhold_bss(wdev->current_bss);
 640                 cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
 641                 wdev->current_bss = NULL;
 642         }
 643
 644         if (status != WLAN_STATUS_SUCCESS) {
 645                 kfree(wdev->connect_keys);
 646                 wdev->connect_keys = NULL;
 647                 wdev->ssid_len = 0;
 648                 if (bss) {
 649                         cfg80211_unhold_bss(bss_from_pub(bss));
 650                         cfg80211_put_bss(wdev->wiphy, bss);
 651                 }
 652                 return;
 653         }
 654
 655         if (WARN_ON(!bss))
 656                 return;
 657
 658         wdev->current_bss = bss_from_pub(bss);
 659
 660         cfg80211_upload_connect_keys(wdev);
 661
 662         rcu_read_lock();
 663         country_ie = ieee80211_bss_get_ie(bss, WLAN_EID_COUNTRY);
 664         if (!country_ie) {
 665                 rcu_read_unlock();
 666                 return;
 667         }
 668
 669         country_ie = kmemdup(country_ie, 2 + country_ie[1], GFP_ATOMIC);
 670         rcu_read_unlock();
 671
 672         if (!country_ie)
 673                 return;
 674
 675         /*
 676          * ieee80211_bss_get_ie() ensures we can access:
 677          * - country_ie + 2, the start of the country ie data, and
 678          * - and country_ie[1] which is the IE length
 679          */
 680         regulatory_hint_country_ie(wdev->wiphy, bss->channel->band,
 681                                    country_ie + 2, country_ie[1]);
 682         kfree(country_ie);
 683 }
 684
 685 void cfg80211_connect_result(struct net_device *dev, const u8 *bssid,
 686                              const u8 *req_ie, size_t req_ie_len,
 687                              const u8 *resp_ie, size_t resp_ie_len,
 688                              u16 status, gfp_t gfp)
 689 {
 690         struct wireless_dev *wdev = dev->ieee80211_ptr;
 691         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 692         struct cfg80211_event *ev;
 693         unsigned long flags;
 694
 695         ev = kzalloc(sizeof(*ev) + req_ie_len + resp_ie_len, gfp);
 696         if (!ev)
 697                 return;
 698
 699         ev->type = EVENT_CONNECT_RESULT;
 700         if (bssid)
 701                 memcpy(ev->cr.bssid, bssid, ETH_ALEN);
 702         if (req_ie_len) {
 703                 ev->cr.req_ie = ((u8 *)ev) + sizeof(*ev);
 704                 ev->cr.req_ie_len = req_ie_len;
 705                 memcpy((void *)ev->cr.req_ie, req_ie, req_ie_len);
 706         }
 707         if (resp_ie_len) {
 708                 ev->cr.resp_ie = ((u8 *)ev) + sizeof(*ev) + req_ie_len;
 709                 ev->cr.resp_ie_len = resp_ie_len;
 710                 memcpy((void *)ev->cr.resp_ie, resp_ie, resp_ie_len);
 711         }
 712         ev->cr.status = status;
 713
 714         spin_lock_irqsave(&wdev->event_lock, flags);
 715         list_add_tail(&ev->list, &wdev->event_list);
 716         spin_unlock_irqrestore(&wdev->event_lock, flags);
 717         queue_work(cfg80211_wq, &rdev->event_work);
 718 }
 719 EXPORT_SYMBOL(cfg80211_connect_result);
 720
 721 /* Consumes bss object one way or another */
 722 void __cfg80211_roamed(struct wireless_dev *wdev,
 723                        struct cfg80211_bss *bss,
 724                        const u8 *req_ie, size_t req_ie_len,
 725                        const u8 *resp_ie, size_t resp_ie_len)
 726 {
 727 #ifdef CONFIG_CFG80211_WEXT
 728         union iwreq_data wrqu;
 729 #endif
 730         ASSERT_WDEV_LOCK(wdev);
 731
 732         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION &&
 733                     wdev->iftype != NL80211_IFTYPE_P2P_CLIENT))
 734                 goto out;
 735
 736         if (WARN_ON(!wdev->current_bss))
 737                 goto out;
 738
 739         cfg80211_unhold_bss(wdev->current_bss);
 740         cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
 741         wdev->current_bss = NULL;
 742
 743         cfg80211_hold_bss(bss_from_pub(bss));
 744         wdev->current_bss = bss_from_pub(bss);
 745
 746         nl80211_send_roamed(wiphy_to_dev(wdev->wiphy), wdev->netdev, bss->bssid,
 747                             req_ie, req_ie_len, resp_ie, resp_ie_len,
 748                             GFP_KERNEL);
 749
 750 #ifdef CONFIG_CFG80211_WEXT
 751         if (req_ie) {
 752                 memset(&wrqu, 0, sizeof(wrqu));
 753                 wrqu.data.length = req_ie_len;
 754                 wireless_send_event(wdev->netdev, IWEVASSOCREQIE,
 755                                     &wrqu, req_ie);
 756         }
 757
 758         if (resp_ie) {
 759                 memset(&wrqu, 0, sizeof(wrqu));
 760                 wrqu.data.length = resp_ie_len;
 761                 wireless_send_event(wdev->netdev, IWEVASSOCRESPIE,
 762                                     &wrqu, resp_ie);
 763         }
 764
 765         memset(&wrqu, 0, sizeof(wrqu));
 766         wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 767         memcpy(wrqu.ap_addr.sa_data, bss->bssid, ETH_ALEN);
 768         memcpy(wdev->wext.prev_bssid, bss->bssid, ETH_ALEN);
 769         wdev->wext.prev_bssid_valid = true;
 770         wireless_send_event(wdev->netdev, SIOCGIWAP, &wrqu, NULL);
 771 #endif
 772
 773         return;
 774 out:
 775         cfg80211_put_bss(wdev->wiphy, bss);
 776 }
 777
 778 void cfg80211_roamed(struct net_device *dev,
 779                      struct ieee80211_channel *channel,
 780                      const u8 *bssid,
 781                      const u8 *req_ie, size_t req_ie_len,
 782                      const u8 *resp_ie, size_t resp_ie_len, gfp_t gfp)
 783 {
 784         struct wireless_dev *wdev = dev->ieee80211_ptr;
 785         struct cfg80211_bss *bss;
 786
 787         bss = cfg80211_get_bss(wdev->wiphy, channel, bssid, wdev->ssid,
 788                                wdev->ssid_len, WLAN_CAPABILITY_ESS,
 789                                WLAN_CAPABILITY_ESS);
 790         if (WARN_ON(!bss))
 791                 return;
 792
 793         cfg80211_roamed_bss(dev, bss, req_ie, req_ie_len, resp_ie,
 794                             resp_ie_len, gfp);
 795 }
 796 EXPORT_SYMBOL(cfg80211_roamed);
 797
 798 /* Consumes bss object one way or another */
 799 void cfg80211_roamed_bss(struct net_device *dev,
 800                          struct cfg80211_bss *bss, const u8 *req_ie,
 801                          size_t req_ie_len, const u8 *resp_ie,
 802                          size_t resp_ie_len, gfp_t gfp)
 803 {
 804         struct wireless_dev *wdev = dev->ieee80211_ptr;
 805         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 806         struct cfg80211_event *ev;
 807         unsigned long flags;
 808
 809         if (WARN_ON(!bss))
 810                 return;
 811
 812         ev = kzalloc(sizeof(*ev) + req_ie_len + resp_ie_len, gfp);
 813         if (!ev) {
 814                 cfg80211_put_bss(wdev->wiphy, bss);
 815                 return;
 816         }
 817
 818         ev->type = EVENT_ROAMED;
 819         ev->rm.req_ie = ((u8 *)ev) + sizeof(*ev);
 820         ev->rm.req_ie_len = req_ie_len;
 821         memcpy((void *)ev->rm.req_ie, req_ie, req_ie_len);
 822         ev->rm.resp_ie = ((u8 *)ev) + sizeof(*ev) + req_ie_len;
 823         ev->rm.resp_ie_len = resp_ie_len;
 824         memcpy((void *)ev->rm.resp_ie, resp_ie, resp_ie_len);
 825         ev->rm.bss = bss;
 826
 827         spin_lock_irqsave(&wdev->event_lock, flags);
 828         list_add_tail(&ev->list, &wdev->event_list);
 829         spin_unlock_irqrestore(&wdev->event_lock, flags);
 830         queue_work(cfg80211_wq, &rdev->event_work);
 831 }
 832 EXPORT_SYMBOL(cfg80211_roamed_bss);
 833
 834 void __cfg80211_disconnected(struct net_device *dev, const u8 *ie,
 835                              size_t ie_len, u16 reason, bool from_ap)
 836 {
 837         struct wireless_dev *wdev = dev->ieee80211_ptr;
 838         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 839         int i;
 840 #ifdef CONFIG_CFG80211_WEXT
 841         union iwreq_data wrqu;
 842 #endif
 843
 844         ASSERT_WDEV_LOCK(wdev);
 845
 846         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION &&
 847                     wdev->iftype != NL80211_IFTYPE_P2P_CLIENT))
 848                 return;
 849
 850         if (wdev->current_bss) {
 851                 cfg80211_unhold_bss(wdev->current_bss);
 852                 cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
 853         }
 854
 855         wdev->current_bss = NULL;
 856         wdev->ssid_len = 0;
 857
 858         nl80211_send_disconnected(rdev, dev, reason, ie, ie_len, from_ap);
 859
 860         /*
 861          * Delete all the keys ... pairwise keys can't really
 862          * exist any more anyway, but default keys might.
 863          */
 864         if (rdev->ops->del_key)
 865                 for (i = 0; i < 6; i++)
 866                         rdev_del_key(rdev, dev, i, false, NULL);
 867
 868         rdev_set_qos_map(rdev, dev, NULL);
 869
 870 #ifdef CONFIG_CFG80211_WEXT
 871         memset(&wrqu, 0, sizeof(wrqu));
 872         wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 873         wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL);
 874         wdev->wext.connect.ssid_len = 0;
 875 #endif
 876
 877         schedule_work(&cfg80211_disconnect_work);
 878 }
 879
 880 void cfg80211_disconnected(struct net_device *dev, u16 reason,
 881                            u8 *ie, size_t ie_len, gfp_t gfp)
 882 {
 883         struct wireless_dev *wdev = dev->ieee80211_ptr;
 884         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 885         struct cfg80211_event *ev;
 886         unsigned long flags;
 887
 888         ev = kzalloc(sizeof(*ev) + ie_len, gfp);
 889         if (!ev)
 890                 return;
 891
 892         ev->type = EVENT_DISCONNECTED;
 893         ev->dc.ie = ((u8 *)ev) + sizeof(*ev);
 894         ev->dc.ie_len = ie_len;
 895         memcpy((void *)ev->dc.ie, ie, ie_len);
 896         ev->dc.reason = reason;
 897
 898         spin_lock_irqsave(&wdev->event_lock, flags);
 899         list_add_tail(&ev->list, &wdev->event_list);
 900         spin_unlock_irqrestore(&wdev->event_lock, flags);
 901         queue_work(cfg80211_wq, &rdev->event_work);
 902 }
 903 EXPORT_SYMBOL(cfg80211_disconnected);
 904
 905 /*
 906  * API calls for nl80211/wext compatibility code
 907  */
 908 int cfg80211_connect(struct cfg80211_registered_device *rdev,
 909                      struct net_device *dev,
 910                      struct cfg80211_connect_params *connect,
 911                      struct cfg80211_cached_keys *connkeys,
 912                      const u8 *prev_bssid)
 913 {
 914         struct wireless_dev *wdev = dev->ieee80211_ptr;
 915         int err;
 916
 917         ASSERT_WDEV_LOCK(wdev);
 918
 919         if (WARN_ON(wdev->connect_keys)) {
 920                 kfree(wdev->connect_keys);
 921                 wdev->connect_keys = NULL;
 922         }
 923
 924         cfg80211_oper_and_ht_capa(&connect->ht_capa_mask,
 925                                   rdev->wiphy.ht_capa_mod_mask);
 926
 927         if (connkeys && connkeys->def >= 0) {
 928                 int idx;
 929                 u32 cipher;
 930
 931                 idx = connkeys->def;
 932                 cipher = connkeys->params[idx].cipher;
 933                 /* If given a WEP key we may need it for shared key auth */
 934                 if (cipher == WLAN_CIPHER_SUITE_WEP40 ||
 935                     cipher == WLAN_CIPHER_SUITE_WEP104) {
 936                         connect->key_idx = idx;
 937                         connect->key = connkeys->params[idx].key;
 938                         connect->key_len = connkeys->params[idx].key_len;
 939
 940                         /*
 941                          * If ciphers are not set (e.g. when going through
 942                          * iwconfig), we have to set them appropriately here.
 943                          */
 944                         if (connect->crypto.cipher_group == 0)
 945                                 connect->crypto.cipher_group = cipher;
 946
 947                         if (connect->crypto.n_ciphers_pairwise == 0) {
 948                                 connect->crypto.n_ciphers_pairwise = 1;
 949                                 connect->crypto.ciphers_pairwise[0] = cipher;
 950                         }
 951                 }
 952         }
 953
 954         wdev->connect_keys = connkeys;
 955         memcpy(wdev->ssid, connect->ssid, connect->ssid_len);
 956         wdev->ssid_len = connect->ssid_len;
 957
 958         if (!rdev->ops->connect)
 959                 err = cfg80211_sme_connect(wdev, connect, prev_bssid);
 960         else
 961                 err = rdev_connect(rdev, dev, connect);
 962
 963         if (err) {
 964                 wdev->connect_keys = NULL;
 965                 wdev->ssid_len = 0;
 966                 return err;
 967         }
 968
 969         return 0;
 970 }
 971
 972 int cfg80211_disconnect(struct cfg80211_registered_device *rdev,
 973                         struct net_device *dev, u16 reason, bool wextev)
 974 {
 975         struct wireless_dev *wdev = dev->ieee80211_ptr;
 976         int err = 0;
 977
 978         ASSERT_WDEV_LOCK(wdev);
 979
 980         kfree(wdev->connect_keys);
 981         wdev->connect_keys = NULL;
 982
 983         if (wdev->conn)
 984                 err = cfg80211_sme_disconnect(wdev, reason);
 985         else if (!rdev->ops->disconnect)
 986                 cfg80211_mlme_down(rdev, dev);
 987         else if (wdev->current_bss)
 988                 err = rdev_disconnect(rdev, dev, reason);
 989
 990         return err;
 991 }