net/wireless/sme.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * SME code for cfg80211
   4  * both driver SME event handling and the SME implementation
   5  * (for nl80211's connect() and wext)
   6  *
   7  * Copyright 2009       Johannes Berg <johannes@sipsolutions.net>
   8  * Copyright (C) 2009, 2020 Intel Corporation. All rights reserved.
   9  * Copyright 2017       Intel Deutschland GmbH
  10  */
  11
  12 #include <linux/etherdevice.h>
  13 #include <linux/if_arp.h>
  14 #include <linux/slab.h>
  15 #include <linux/workqueue.h>
  16 #include <linux/wireless.h>
  17 #include <linux/export.h>
  18 #include <net/iw_handler.h>
  19 #include <net/cfg80211.h>
  20 #include <net/rtnetlink.h>
  21 #include "nl80211.h"
  22 #include "reg.h"
  23 #include "rdev-ops.h"
  24
  25 /*
  26  * Software SME in cfg80211, using auth/assoc/deauth calls to the
  27  * driver. This is for implementing nl80211's connect/disconnect
  28  * and wireless extensions (if configured.)
  29  */
  30
  31 struct cfg80211_conn {
  32         struct cfg80211_connect_params params;
  33         /* these are sub-states of the _CONNECTING sme_state */
  34         enum {
  35                 CFG80211_CONN_SCANNING,
  36                 CFG80211_CONN_SCAN_AGAIN,
  37                 CFG80211_CONN_AUTHENTICATE_NEXT,
  38                 CFG80211_CONN_AUTHENTICATING,
  39                 CFG80211_CONN_AUTH_FAILED_TIMEOUT,
  40                 CFG80211_CONN_ASSOCIATE_NEXT,
  41                 CFG80211_CONN_ASSOCIATING,
  42                 CFG80211_CONN_ASSOC_FAILED,
  43                 CFG80211_CONN_ASSOC_FAILED_TIMEOUT,
  44                 CFG80211_CONN_DEAUTH,
  45                 CFG80211_CONN_ABANDON,
  46                 CFG80211_CONN_CONNECTED,
  47         } state;
  48         u8 bssid[ETH_ALEN], prev_bssid[ETH_ALEN];
  49         const u8 *ie;
  50         size_t ie_len;
  51         bool auto_auth, prev_bssid_valid;
  52 };
  53
  54 static void cfg80211_sme_free(struct wireless_dev *wdev)
  55 {
  56         if (!wdev->conn)
  57                 return;
  58
  59         kfree(wdev->conn->ie);
  60         kfree(wdev->conn);
  61         wdev->conn = NULL;
  62 }
  63
  64 static int cfg80211_conn_scan(struct wireless_dev *wdev)
  65 {
  66         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
  67         struct cfg80211_scan_request *request;
  68         int n_channels, err;
  69
  70         ASSERT_WDEV_LOCK(wdev);
  71
  72         if (rdev->scan_req || rdev->scan_msg)
  73                 return -EBUSY;
  74
  75         if (wdev->conn->params.channel)
  76                 n_channels = 1;
  77         else
  78                 n_channels = ieee80211_get_num_supported_channels(wdev->wiphy);
  79
  80         request = kzalloc(sizeof(*request) + sizeof(request->ssids[0]) +
  81                           sizeof(request->channels[0]) * n_channels,
  82                           GFP_KERNEL);
  83         if (!request)
  84                 return -ENOMEM;
  85
  86         if (wdev->conn->params.channel) {
  87                 enum nl80211_band band = wdev->conn->params.channel->band;
  88                 struct ieee80211_supported_band *sband =
  89                         wdev->wiphy->bands[band];
  90
  91                 if (!sband) {
  92                         kfree(request);
  93                         return -EINVAL;
  94                 }
  95                 request->channels[0] = wdev->conn->params.channel;
  96                 request->rates[band] = (1 << sband->n_bitrates) - 1;
  97         } else {
  98                 int i = 0, j;
  99                 enum nl80211_band band;
 100                 struct ieee80211_supported_band *bands;
 101                 struct ieee80211_channel *channel;
 102
 103                 for (band = 0; band < NUM_NL80211_BANDS; band++) {
 104                         bands = wdev->wiphy->bands[band];
 105                         if (!bands)
 106                                 continue;
 107                         for (j = 0; j < bands->n_channels; j++) {
 108                                 channel = &bands->channels[j];
 109                                 if (channel->flags & IEEE80211_CHAN_DISABLED)
 110                                         continue;
 111                                 request->channels[i++] = channel;
 112                         }
 113                         request->rates[band] = (1 << bands->n_bitrates) - 1;
 114                 }
 115                 n_channels = i;
 116         }
 117         request->n_channels = n_channels;
 118         request->ssids = (void *)&request->channels[n_channels];
 119         request->n_ssids = 1;
 120
 121         memcpy(request->ssids[0].ssid, wdev->conn->params.ssid,
 122                 wdev->conn->params.ssid_len);
 123         request->ssids[0].ssid_len = wdev->conn->params.ssid_len;
 124
 125         eth_broadcast_addr(request->bssid);
 126
 127         request->wdev = wdev;
 128         request->wiphy = &rdev->wiphy;
 129         request->scan_start = jiffies;
 130
 131         rdev->scan_req = request;
 132
 133         err = rdev_scan(rdev, request);
 134         if (!err) {
 135                 wdev->conn->state = CFG80211_CONN_SCANNING;
 136                 nl80211_send_scan_start(rdev, wdev);
 137                 dev_hold(wdev->netdev);
 138         } else {
 139                 rdev->scan_req = NULL;
 140                 kfree(request);
 141         }
 142         return err;
 143 }
 144
 145 static int cfg80211_conn_do_work(struct wireless_dev *wdev,
 146                                  enum nl80211_timeout_reason *treason)
 147 {
 148         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 149         struct cfg80211_connect_params *params;
 150         struct cfg80211_assoc_request req = {};
 151         int err;
 152
 153         ASSERT_WDEV_LOCK(wdev);
 154
 155         if (!wdev->conn)
 156                 return 0;
 157
 158         params = &wdev->conn->params;
 159
 160         switch (wdev->conn->state) {
 161         case CFG80211_CONN_SCANNING:
 162                 /* didn't find it during scan ... */
 163                 return -ENOENT;
 164         case CFG80211_CONN_SCAN_AGAIN:
 165                 return cfg80211_conn_scan(wdev);
 166         case CFG80211_CONN_AUTHENTICATE_NEXT:
 167                 if (WARN_ON(!rdev->ops->auth))
 168                         return -EOPNOTSUPP;
 169                 wdev->conn->state = CFG80211_CONN_AUTHENTICATING;
 170                 return cfg80211_mlme_auth(rdev, wdev->netdev,
 171                                           params->channel, params->auth_type,
 172                                           params->bssid,
 173                                           params->ssid, params->ssid_len,
 174                                           NULL, 0,
 175                                           params->key, params->key_len,
 176                                           params->key_idx, NULL, 0);
 177         case CFG80211_CONN_AUTH_FAILED_TIMEOUT:
 178                 *treason = NL80211_TIMEOUT_AUTH;
 179                 return -ENOTCONN;
 180         case CFG80211_CONN_ASSOCIATE_NEXT:
 181                 if (WARN_ON(!rdev->ops->assoc))
 182                         return -EOPNOTSUPP;
 183                 wdev->conn->state = CFG80211_CONN_ASSOCIATING;
 184                 if (wdev->conn->prev_bssid_valid)
 185                         req.prev_bssid = wdev->conn->prev_bssid;
 186                 req.ie = params->ie;
 187                 req.ie_len = params->ie_len;
 188                 req.use_mfp = params->mfp != NL80211_MFP_NO;
 189                 req.crypto = params->crypto;
 190                 req.flags = params->flags;
 191                 req.ht_capa = params->ht_capa;
 192                 req.ht_capa_mask = params->ht_capa_mask;
 193                 req.vht_capa = params->vht_capa;
 194                 req.vht_capa_mask = params->vht_capa_mask;
 195
 196                 err = cfg80211_mlme_assoc(rdev, wdev->netdev, params->channel,
 197                                           params->bssid, params->ssid,
 198                                           params->ssid_len, &req);
 199                 if (err)
 200                         cfg80211_mlme_deauth(rdev, wdev->netdev, params->bssid,
 201                                              NULL, 0,
 202                                              WLAN_REASON_DEAUTH_LEAVING,
 203                                              false);
 204                 return err;
 205         case CFG80211_CONN_ASSOC_FAILED_TIMEOUT:
 206                 *treason = NL80211_TIMEOUT_ASSOC;
 207                 fallthrough;
 208         case CFG80211_CONN_ASSOC_FAILED:
 209                 cfg80211_mlme_deauth(rdev, wdev->netdev, params->bssid,
 210                                      NULL, 0,
 211                                      WLAN_REASON_DEAUTH_LEAVING, false);
 212                 return -ENOTCONN;
 213         case CFG80211_CONN_DEAUTH:
 214                 cfg80211_mlme_deauth(rdev, wdev->netdev, params->bssid,
 215                                      NULL, 0,
 216                                      WLAN_REASON_DEAUTH_LEAVING, false);
 217                 fallthrough;
 218         case CFG80211_CONN_ABANDON:
 219                 /* free directly, disconnected event already sent */
 220                 cfg80211_sme_free(wdev);
 221                 return 0;
 222         default:
 223                 return 0;
 224         }
 225 }
 226
 227 void cfg80211_conn_work(struct work_struct *work)
 228 {
 229         struct cfg80211_registered_device *rdev =
 230                 container_of(work, struct cfg80211_registered_device, conn_work);
 231         struct wireless_dev *wdev;
 232         u8 bssid_buf[ETH_ALEN], *bssid = NULL;
 233         enum nl80211_timeout_reason treason;
 234
 235         wiphy_lock(&rdev->wiphy);
 236
 237         list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
 238                 if (!wdev->netdev)
 239                         continue;
 240
 241                 wdev_lock(wdev);
 242                 if (!netif_running(wdev->netdev)) {
 243                         wdev_unlock(wdev);
 244                         continue;
 245                 }
 246                 if (!wdev->conn ||
 247                     wdev->conn->state == CFG80211_CONN_CONNECTED) {
 248                         wdev_unlock(wdev);
 249                         continue;
 250                 }
 251                 if (wdev->conn->params.bssid) {
 252                         memcpy(bssid_buf, wdev->conn->params.bssid, ETH_ALEN);
 253                         bssid = bssid_buf;
 254                 }
 255                 treason = NL80211_TIMEOUT_UNSPECIFIED;
 256                 if (cfg80211_conn_do_work(wdev, &treason)) {
 257                         struct cfg80211_connect_resp_params cr;
 258
 259                         memset(&cr, 0, sizeof(cr));
 260                         cr.status = -1;
 261                         cr.bssid = bssid;
 262                         cr.timeout_reason = treason;
 263                         __cfg80211_connect_result(wdev->netdev, &cr, false);
 264                 }
 265                 wdev_unlock(wdev);
 266         }
 267
 268         wiphy_unlock(&rdev->wiphy);
 269 }
 270
 271 /* Returned bss is reference counted and must be cleaned up appropriately. */
 272 static struct cfg80211_bss *cfg80211_get_conn_bss(struct wireless_dev *wdev)
 273 {
 274         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 275         struct cfg80211_bss *bss;
 276
 277         ASSERT_WDEV_LOCK(wdev);
 278
 279         bss = cfg80211_get_bss(wdev->wiphy, wdev->conn->params.channel,
 280                                wdev->conn->params.bssid,
 281                                wdev->conn->params.ssid,
 282                                wdev->conn->params.ssid_len,
 283                                wdev->conn_bss_type,
 284                                IEEE80211_PRIVACY(wdev->conn->params.privacy));
 285         if (!bss)
 286                 return NULL;
 287
 288         memcpy(wdev->conn->bssid, bss->bssid, ETH_ALEN);
 289         wdev->conn->params.bssid = wdev->conn->bssid;
 290         wdev->conn->params.channel = bss->channel;
 291         wdev->conn->state = CFG80211_CONN_AUTHENTICATE_NEXT;
 292         schedule_work(&rdev->conn_work);
 293
 294         return bss;
 295 }
 296
 297 static void __cfg80211_sme_scan_done(struct net_device *dev)
 298 {
 299         struct wireless_dev *wdev = dev->ieee80211_ptr;
 300         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 301         struct cfg80211_bss *bss;
 302
 303         ASSERT_WDEV_LOCK(wdev);
 304
 305         if (!wdev->conn)
 306                 return;
 307
 308         if (wdev->conn->state != CFG80211_CONN_SCANNING &&
 309             wdev->conn->state != CFG80211_CONN_SCAN_AGAIN)
 310                 return;
 311
 312         bss = cfg80211_get_conn_bss(wdev);
 313         if (bss)
 314                 cfg80211_put_bss(&rdev->wiphy, bss);
 315         else
 316                 schedule_work(&rdev->conn_work);
 317 }
 318
 319 void cfg80211_sme_scan_done(struct net_device *dev)
 320 {
 321         struct wireless_dev *wdev = dev->ieee80211_ptr;
 322
 323         wdev_lock(wdev);
 324         __cfg80211_sme_scan_done(dev);
 325         wdev_unlock(wdev);
 326 }
 327
 328 void cfg80211_sme_rx_auth(struct wireless_dev *wdev, const u8 *buf, size_t len)
 329 {
 330         struct wiphy *wiphy = wdev->wiphy;
 331         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 332         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)buf;
 333         u16 status_code = le16_to_cpu(mgmt->u.auth.status_code);
 334
 335         ASSERT_WDEV_LOCK(wdev);
 336
 337         if (!wdev->conn || wdev->conn->state == CFG80211_CONN_CONNECTED)
 338                 return;
 339
 340         if (status_code == WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG &&
 341             wdev->conn->auto_auth &&
 342             wdev->conn->params.auth_type != NL80211_AUTHTYPE_NETWORK_EAP) {
 343                 /* select automatically between only open, shared, leap */
 344                 switch (wdev->conn->params.auth_type) {
 345                 case NL80211_AUTHTYPE_OPEN_SYSTEM:
 346                         if (wdev->connect_keys)
 347                                 wdev->conn->params.auth_type =
 348                                         NL80211_AUTHTYPE_SHARED_KEY;
 349                         else
 350                                 wdev->conn->params.auth_type =
 351                                         NL80211_AUTHTYPE_NETWORK_EAP;
 352                         break;
 353                 case NL80211_AUTHTYPE_SHARED_KEY:
 354                         wdev->conn->params.auth_type =
 355                                 NL80211_AUTHTYPE_NETWORK_EAP;
 356                         break;
 357                 default:
 358                         /* huh? */
 359                         wdev->conn->params.auth_type =
 360                                 NL80211_AUTHTYPE_OPEN_SYSTEM;
 361                         break;
 362                 }
 363                 wdev->conn->state = CFG80211_CONN_AUTHENTICATE_NEXT;
 364                 schedule_work(&rdev->conn_work);
 365         } else if (status_code != WLAN_STATUS_SUCCESS) {
 366                 struct cfg80211_connect_resp_params cr;
 367
 368                 memset(&cr, 0, sizeof(cr));
 369                 cr.status = status_code;
 370                 cr.bssid = mgmt->bssid;
 371                 cr.timeout_reason = NL80211_TIMEOUT_UNSPECIFIED;
 372                 __cfg80211_connect_result(wdev->netdev, &cr, false);
 373         } else if (wdev->conn->state == CFG80211_CONN_AUTHENTICATING) {
 374                 wdev->conn->state = CFG80211_CONN_ASSOCIATE_NEXT;
 375                 schedule_work(&rdev->conn_work);
 376         }
 377 }
 378
 379 bool cfg80211_sme_rx_assoc_resp(struct wireless_dev *wdev, u16 status)
 380 {
 381         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 382
 383         if (!wdev->conn)
 384                 return false;
 385
 386         if (status == WLAN_STATUS_SUCCESS) {
 387                 wdev->conn->state = CFG80211_CONN_CONNECTED;
 388                 return false;
 389         }
 390
 391         if (wdev->conn->prev_bssid_valid) {
 392                 /*
 393                  * Some stupid APs don't accept reassoc, so we
 394                  * need to fall back to trying regular assoc;
 395                  * return true so no event is sent to userspace.
 396                  */
 397                 wdev->conn->prev_bssid_valid = false;
 398                 wdev->conn->state = CFG80211_CONN_ASSOCIATE_NEXT;
 399                 schedule_work(&rdev->conn_work);
 400                 return true;
 401         }
 402
 403         wdev->conn->state = CFG80211_CONN_ASSOC_FAILED;
 404         schedule_work(&rdev->conn_work);
 405         return false;
 406 }
 407
 408 void cfg80211_sme_deauth(struct wireless_dev *wdev)
 409 {
 410         cfg80211_sme_free(wdev);
 411 }
 412
 413 void cfg80211_sme_auth_timeout(struct wireless_dev *wdev)
 414 {
 415         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 416
 417         if (!wdev->conn)
 418                 return;
 419
 420         wdev->conn->state = CFG80211_CONN_AUTH_FAILED_TIMEOUT;
 421         schedule_work(&rdev->conn_work);
 422 }
 423
 424 void cfg80211_sme_disassoc(struct wireless_dev *wdev)
 425 {
 426         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 427
 428         if (!wdev->conn)
 429                 return;
 430
 431         wdev->conn->state = CFG80211_CONN_DEAUTH;
 432         schedule_work(&rdev->conn_work);
 433 }
 434
 435 void cfg80211_sme_assoc_timeout(struct wireless_dev *wdev)
 436 {
 437         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 438
 439         if (!wdev->conn)
 440                 return;
 441
 442         wdev->conn->state = CFG80211_CONN_ASSOC_FAILED_TIMEOUT;
 443         schedule_work(&rdev->conn_work);
 444 }
 445
 446 void cfg80211_sme_abandon_assoc(struct wireless_dev *wdev)
 447 {
 448         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 449
 450         if (!wdev->conn)
 451                 return;
 452
 453         wdev->conn->state = CFG80211_CONN_ABANDON;
 454         schedule_work(&rdev->conn_work);
 455 }
 456
 457 static int cfg80211_sme_get_conn_ies(struct wireless_dev *wdev,
 458                                      const u8 *ies, size_t ies_len,
 459                                      const u8 **out_ies, size_t *out_ies_len)
 460 {
 461         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 462         u8 *buf;
 463         size_t offs;
 464
 465         if (!rdev->wiphy.extended_capabilities_len ||
 466             (ies && cfg80211_find_ie(WLAN_EID_EXT_CAPABILITY, ies, ies_len))) {
 467                 *out_ies = kmemdup(ies, ies_len, GFP_KERNEL);
 468                 if (!*out_ies)
 469                         return -ENOMEM;
 470                 *out_ies_len = ies_len;
 471                 return 0;
 472         }
 473
 474         buf = kmalloc(ies_len + rdev->wiphy.extended_capabilities_len + 2,
 475                       GFP_KERNEL);
 476         if (!buf)
 477                 return -ENOMEM;
 478
 479         if (ies_len) {
 480                 static const u8 before_extcapa[] = {
 481                         /* not listing IEs expected to be created by driver */
 482                         WLAN_EID_RSN,
 483                         WLAN_EID_QOS_CAPA,
 484                         WLAN_EID_RRM_ENABLED_CAPABILITIES,
 485                         WLAN_EID_MOBILITY_DOMAIN,
 486                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 487                         WLAN_EID_BSS_COEX_2040,
 488                 };
 489
 490                 offs = ieee80211_ie_split(ies, ies_len, before_extcapa,
 491                                           ARRAY_SIZE(before_extcapa), 0);
 492                 memcpy(buf, ies, offs);
 493                 /* leave a whole for extended capabilities IE */
 494                 memcpy(buf + offs + rdev->wiphy.extended_capabilities_len + 2,
 495                        ies + offs, ies_len - offs);
 496         } else {
 497                 offs = 0;
 498         }
 499
 500         /* place extended capabilities IE (with only driver capabilities) */
 501         buf[offs] = WLAN_EID_EXT_CAPABILITY;
 502         buf[offs + 1] = rdev->wiphy.extended_capabilities_len;
 503         memcpy(buf + offs + 2,
 504                rdev->wiphy.extended_capabilities,
 505                rdev->wiphy.extended_capabilities_len);
 506
 507         *out_ies = buf;
 508         *out_ies_len = ies_len + rdev->wiphy.extended_capabilities_len + 2;
 509
 510         return 0;
 511 }
 512
 513 static int cfg80211_sme_connect(struct wireless_dev *wdev,
 514                                 struct cfg80211_connect_params *connect,
 515                                 const u8 *prev_bssid)
 516 {
 517         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 518         struct cfg80211_bss *bss;
 519         int err;
 520
 521         if (!rdev->ops->auth || !rdev->ops->assoc)
 522                 return -EOPNOTSUPP;
 523
 524         if (wdev->current_bss) {
 525                 cfg80211_unhold_bss(wdev->current_bss);
 526                 cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
 527                 wdev->current_bss = NULL;
 528
 529                 cfg80211_sme_free(wdev);
 530         }
 531
 532         if (wdev->conn)
 533                 return -EINPROGRESS;
 534
 535         wdev->conn = kzalloc(sizeof(*wdev->conn), GFP_KERNEL);
 536         if (!wdev->conn)
 537                 return -ENOMEM;
 538
 539         /*
 540          * Copy all parameters, and treat explicitly IEs, BSSID, SSID.
 541          */
 542         memcpy(&wdev->conn->params, connect, sizeof(*connect));
 543         if (connect->bssid) {
 544                 wdev->conn->params.bssid = wdev->conn->bssid;
 545                 memcpy(wdev->conn->bssid, connect->bssid, ETH_ALEN);
 546         }
 547
 548         if (cfg80211_sme_get_conn_ies(wdev, connect->ie, connect->ie_len,
 549                                       &wdev->conn->ie,
 550                                       &wdev->conn->params.ie_len)) {
 551                 kfree(wdev->conn);
 552                 wdev->conn = NULL;
 553                 return -ENOMEM;
 554         }
 555         wdev->conn->params.ie = wdev->conn->ie;
 556
 557         if (connect->auth_type == NL80211_AUTHTYPE_AUTOMATIC) {
 558                 wdev->conn->auto_auth = true;
 559                 /* start with open system ... should mostly work */
 560                 wdev->conn->params.auth_type =
 561                         NL80211_AUTHTYPE_OPEN_SYSTEM;
 562         } else {
 563                 wdev->conn->auto_auth = false;
 564         }
 565
 566         wdev->conn->params.ssid = wdev->ssid;
 567         wdev->conn->params.ssid_len = wdev->ssid_len;
 568
 569         /* see if we have the bss already */
 570         bss = cfg80211_get_conn_bss(wdev);
 571
 572         if (prev_bssid) {
 573                 memcpy(wdev->conn->prev_bssid, prev_bssid, ETH_ALEN);
 574                 wdev->conn->prev_bssid_valid = true;
 575         }
 576
 577         /* we're good if we have a matching bss struct */
 578         if (bss) {
 579                 enum nl80211_timeout_reason treason;
 580
 581                 err = cfg80211_conn_do_work(wdev, &treason);
 582                 cfg80211_put_bss(wdev->wiphy, bss);
 583         } else {
 584                 /* otherwise we'll need to scan for the AP first */
 585                 err = cfg80211_conn_scan(wdev);
 586
 587                 /*
 588                  * If we can't scan right now, then we need to scan again
 589                  * after the current scan finished, since the parameters
 590                  * changed (unless we find a good AP anyway).
 591                  */
 592                 if (err == -EBUSY) {
 593                         err = 0;
 594                         wdev->conn->state = CFG80211_CONN_SCAN_AGAIN;
 595                 }
 596         }
 597
 598         if (err)
 599                 cfg80211_sme_free(wdev);
 600
 601         return err;
 602 }
 603
 604 static int cfg80211_sme_disconnect(struct wireless_dev *wdev, u16 reason)
 605 {
 606         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 607         int err;
 608
 609         if (!wdev->conn)
 610                 return 0;
 611
 612         if (!rdev->ops->deauth)
 613                 return -EOPNOTSUPP;
 614
 615         if (wdev->conn->state == CFG80211_CONN_SCANNING ||
 616             wdev->conn->state == CFG80211_CONN_SCAN_AGAIN) {
 617                 err = 0;
 618                 goto out;
 619         }
 620
 621         /* wdev->conn->params.bssid must be set if > SCANNING */
 622         err = cfg80211_mlme_deauth(rdev, wdev->netdev,
 623                                    wdev->conn->params.bssid,
 624                                    NULL, 0, reason, false);
 625  out:
 626         cfg80211_sme_free(wdev);
 627         return err;
 628 }
 629
 630 /*
 631  * code shared for in-device and software SME
 632  */
 633
 634 static bool cfg80211_is_all_idle(void)
 635 {
 636         struct cfg80211_registered_device *rdev;
 637         struct wireless_dev *wdev;
 638         bool is_all_idle = true;
 639
 640         /*
 641          * All devices must be idle as otherwise if you are actively
 642          * scanning some new beacon hints could be learned and would
 643          * count as new regulatory hints.
 644          * Also if there is any other active beaconing interface we
 645          * need not issue a disconnect hint and reset any info such
 646          * as chan dfs state, etc.
 647          */
 648         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
 649                 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
 650                         wdev_lock(wdev);
 651                         if (wdev->conn || wdev->current_bss ||
 652                             cfg80211_beaconing_iface_active(wdev))
 653                                 is_all_idle = false;
 654                         wdev_unlock(wdev);
 655                 }
 656         }
 657
 658         return is_all_idle;
 659 }
 660
 661 static void disconnect_work(struct work_struct *work)
 662 {
 663         rtnl_lock();
 664         if (cfg80211_is_all_idle())
 665                 regulatory_hint_disconnect();
 666         rtnl_unlock();
 667 }
 668
 669 DECLARE_WORK(cfg80211_disconnect_work, disconnect_work);
 670
 671
 672 /*
 673  * API calls for drivers implementing connect/disconnect and
 674  * SME event handling
 675  */
 676
 677 /* This method must consume bss one way or another */
 678 void __cfg80211_connect_result(struct net_device *dev,
 679                                struct cfg80211_connect_resp_params *cr,
 680                                bool wextev)
 681 {
 682         struct wireless_dev *wdev = dev->ieee80211_ptr;
 683         const u8 *country_ie;
 684 #ifdef CONFIG_CFG80211_WEXT
 685         union iwreq_data wrqu;
 686 #endif
 687
 688         ASSERT_WDEV_LOCK(wdev);
 689
 690         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION &&
 691                     wdev->iftype != NL80211_IFTYPE_P2P_CLIENT)) {
 692                 cfg80211_put_bss(wdev->wiphy, cr->bss);
 693                 return;
 694         }
 695
 696         wdev->unprot_beacon_reported = 0;
 697         nl80211_send_connect_result(wiphy_to_rdev(wdev->wiphy), dev, cr,
 698                                     GFP_KERNEL);
 699
 700 #ifdef CONFIG_CFG80211_WEXT
 701         if (wextev) {
 702                 if (cr->req_ie && cr->status == WLAN_STATUS_SUCCESS) {
 703                         memset(&wrqu, 0, sizeof(wrqu));
 704                         wrqu.data.length = cr->req_ie_len;
 705                         wireless_send_event(dev, IWEVASSOCREQIE, &wrqu,
 706                                             cr->req_ie);
 707                 }
 708
 709                 if (cr->resp_ie && cr->status == WLAN_STATUS_SUCCESS) {
 710                         memset(&wrqu, 0, sizeof(wrqu));
 711                         wrqu.data.length = cr->resp_ie_len;
 712                         wireless_send_event(dev, IWEVASSOCRESPIE, &wrqu,
 713                                             cr->resp_ie);
 714                 }
 715
 716                 memset(&wrqu, 0, sizeof(wrqu));
 717                 wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 718                 if (cr->bssid && cr->status == WLAN_STATUS_SUCCESS) {
 719                         memcpy(wrqu.ap_addr.sa_data, cr->bssid, ETH_ALEN);
 720                         memcpy(wdev->wext.prev_bssid, cr->bssid, ETH_ALEN);
 721                         wdev->wext.prev_bssid_valid = true;
 722                 }
 723                 wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL);
 724         }
 725 #endif
 726
 727         if (!cr->bss && (cr->status == WLAN_STATUS_SUCCESS)) {
 728                 WARN_ON_ONCE(!wiphy_to_rdev(wdev->wiphy)->ops->connect);
 729                 cr->bss = cfg80211_get_bss(wdev->wiphy, NULL, cr->bssid,
 730                                            wdev->ssid, wdev->ssid_len,
 731                                            wdev->conn_bss_type,
 732                                            IEEE80211_PRIVACY_ANY);
 733                 if (cr->bss)
 734                         cfg80211_hold_bss(bss_from_pub(cr->bss));
 735         }
 736
 737         if (wdev->current_bss) {
 738                 cfg80211_unhold_bss(wdev->current_bss);
 739                 cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
 740                 wdev->current_bss = NULL;
 741         }
 742
 743         if (cr->status != WLAN_STATUS_SUCCESS) {
 744                 kfree_sensitive(wdev->connect_keys);
 745                 wdev->connect_keys = NULL;
 746                 wdev->ssid_len = 0;
 747                 wdev->conn_owner_nlportid = 0;
 748                 if (cr->bss) {
 749                         cfg80211_unhold_bss(bss_from_pub(cr->bss));
 750                         cfg80211_put_bss(wdev->wiphy, cr->bss);
 751                 }
 752                 cfg80211_sme_free(wdev);
 753                 return;
 754         }
 755
 756         if (WARN_ON(!cr->bss))
 757                 return;
 758
 759         wdev->current_bss = bss_from_pub(cr->bss);
 760
 761         if (!(wdev->wiphy->flags & WIPHY_FLAG_HAS_STATIC_WEP))
 762                 cfg80211_upload_connect_keys(wdev);
 763
 764         rcu_read_lock();
 765         country_ie = ieee80211_bss_get_ie(cr->bss, WLAN_EID_COUNTRY);
 766         if (!country_ie) {
 767                 rcu_read_unlock();
 768                 return;
 769         }
 770
 771         country_ie = kmemdup(country_ie, 2 + country_ie[1], GFP_ATOMIC);
 772         rcu_read_unlock();
 773
 774         if (!country_ie)
 775                 return;
 776
 777         /*
 778          * ieee80211_bss_get_ie() ensures we can access:
 779          * - country_ie + 2, the start of the country ie data, and
 780          * - and country_ie[1] which is the IE length
 781          */
 782         regulatory_hint_country_ie(wdev->wiphy, cr->bss->channel->band,
 783                                    country_ie + 2, country_ie[1]);
 784         kfree(country_ie);
 785 }
 786
 787 /* Consumes bss object one way or another */
 788 void cfg80211_connect_done(struct net_device *dev,
 789                            struct cfg80211_connect_resp_params *params,
 790                            gfp_t gfp)
 791 {
 792         struct wireless_dev *wdev = dev->ieee80211_ptr;
 793         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 794         struct cfg80211_event *ev;
 795         unsigned long flags;
 796         u8 *next;
 797
 798         if (params->bss) {
 799                 struct cfg80211_internal_bss *ibss = bss_from_pub(params->bss);
 800
 801                 if (list_empty(&ibss->list)) {
 802                         struct cfg80211_bss *found = NULL, *tmp = params->bss;
 803
 804                         found = cfg80211_get_bss(wdev->wiphy, NULL,
 805                                                  params->bss->bssid,
 806                                                  wdev->ssid, wdev->ssid_len,
 807                                                  wdev->conn_bss_type,
 808                                                  IEEE80211_PRIVACY_ANY);
 809                         if (found) {
 810                                 /* The same BSS is already updated so use it
 811                                  * instead, as it has latest info.
 812                                  */
 813                                 params->bss = found;
 814                         } else {
 815                                 /* Update with BSS provided by driver, it will
 816                                  * be freshly added and ref cnted, we can free
 817                                  * the old one.
 818                                  *
 819                                  * signal_valid can be false, as we are not
 820                                  * expecting the BSS to be found.
 821                                  *
 822                                  * keep the old timestamp to avoid confusion
 823                                  */
 824                                 cfg80211_bss_update(rdev, ibss, false,
 825                                                     ibss->ts);
 826                         }
 827
 828                         cfg80211_put_bss(wdev->wiphy, tmp);
 829                 }
 830         }
 831
 832         ev = kzalloc(sizeof(*ev) + (params->bssid ? ETH_ALEN : 0) +
 833                      params->req_ie_len + params->resp_ie_len +
 834                      params->fils.kek_len + params->fils.pmk_len +
 835                      (params->fils.pmkid ? WLAN_PMKID_LEN : 0), gfp);
 836         if (!ev) {
 837                 cfg80211_put_bss(wdev->wiphy, params->bss);
 838                 return;
 839         }
 840
 841         ev->type = EVENT_CONNECT_RESULT;
 842         next = ((u8 *)ev) + sizeof(*ev);
 843         if (params->bssid) {
 844                 ev->cr.bssid = next;
 845                 memcpy((void *)ev->cr.bssid, params->bssid, ETH_ALEN);
 846                 next += ETH_ALEN;
 847         }
 848         if (params->req_ie_len) {
 849                 ev->cr.req_ie = next;
 850                 ev->cr.req_ie_len = params->req_ie_len;
 851                 memcpy((void *)ev->cr.req_ie, params->req_ie,
 852                        params->req_ie_len);
 853                 next += params->req_ie_len;
 854         }
 855         if (params->resp_ie_len) {
 856                 ev->cr.resp_ie = next;
 857                 ev->cr.resp_ie_len = params->resp_ie_len;
 858                 memcpy((void *)ev->cr.resp_ie, params->resp_ie,
 859                        params->resp_ie_len);
 860                 next += params->resp_ie_len;
 861         }
 862         if (params->fils.kek_len) {
 863                 ev->cr.fils.kek = next;
 864                 ev->cr.fils.kek_len = params->fils.kek_len;
 865                 memcpy((void *)ev->cr.fils.kek, params->fils.kek,
 866                        params->fils.kek_len);
 867                 next += params->fils.kek_len;
 868         }
 869         if (params->fils.pmk_len) {
 870                 ev->cr.fils.pmk = next;
 871                 ev->cr.fils.pmk_len = params->fils.pmk_len;
 872                 memcpy((void *)ev->cr.fils.pmk, params->fils.pmk,
 873                        params->fils.pmk_len);
 874                 next += params->fils.pmk_len;
 875         }
 876         if (params->fils.pmkid) {
 877                 ev->cr.fils.pmkid = next;
 878                 memcpy((void *)ev->cr.fils.pmkid, params->fils.pmkid,
 879                        WLAN_PMKID_LEN);
 880                 next += WLAN_PMKID_LEN;
 881         }
 882         ev->cr.fils.update_erp_next_seq_num = params->fils.update_erp_next_seq_num;
 883         if (params->fils.update_erp_next_seq_num)
 884                 ev->cr.fils.erp_next_seq_num = params->fils.erp_next_seq_num;
 885         if (params->bss)
 886                 cfg80211_hold_bss(bss_from_pub(params->bss));
 887         ev->cr.bss = params->bss;
 888         ev->cr.status = params->status;
 889         ev->cr.timeout_reason = params->timeout_reason;
 890
 891         spin_lock_irqsave(&wdev->event_lock, flags);
 892         list_add_tail(&ev->list, &wdev->event_list);
 893         spin_unlock_irqrestore(&wdev->event_lock, flags);
 894         queue_work(cfg80211_wq, &rdev->event_work);
 895 }
 896 EXPORT_SYMBOL(cfg80211_connect_done);
 897
 898 /* Consumes bss object one way or another */
 899 void __cfg80211_roamed(struct wireless_dev *wdev,
 900                        struct cfg80211_roam_info *info)
 901 {
 902 #ifdef CONFIG_CFG80211_WEXT
 903         union iwreq_data wrqu;
 904 #endif
 905         ASSERT_WDEV_LOCK(wdev);
 906
 907         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION &&
 908                     wdev->iftype != NL80211_IFTYPE_P2P_CLIENT))
 909                 goto out;
 910
 911         if (WARN_ON(!wdev->current_bss))
 912                 goto out;
 913
 914         cfg80211_unhold_bss(wdev->current_bss);
 915         cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
 916         wdev->current_bss = NULL;
 917
 918         if (WARN_ON(!info->bss))
 919                 return;
 920
 921         cfg80211_hold_bss(bss_from_pub(info->bss));
 922         wdev->current_bss = bss_from_pub(info->bss);
 923
 924         wdev->unprot_beacon_reported = 0;
 925         nl80211_send_roamed(wiphy_to_rdev(wdev->wiphy),
 926                             wdev->netdev, info, GFP_KERNEL);
 927
 928 #ifdef CONFIG_CFG80211_WEXT
 929         if (info->req_ie) {
 930                 memset(&wrqu, 0, sizeof(wrqu));
 931                 wrqu.data.length = info->req_ie_len;
 932                 wireless_send_event(wdev->netdev, IWEVASSOCREQIE,
 933                                     &wrqu, info->req_ie);
 934         }
 935
 936         if (info->resp_ie) {
 937                 memset(&wrqu, 0, sizeof(wrqu));
 938                 wrqu.data.length = info->resp_ie_len;
 939                 wireless_send_event(wdev->netdev, IWEVASSOCRESPIE,
 940                                     &wrqu, info->resp_ie);
 941         }
 942
 943         memset(&wrqu, 0, sizeof(wrqu));
 944         wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 945         memcpy(wrqu.ap_addr.sa_data, info->bss->bssid, ETH_ALEN);
 946         memcpy(wdev->wext.prev_bssid, info->bss->bssid, ETH_ALEN);
 947         wdev->wext.prev_bssid_valid = true;
 948         wireless_send_event(wdev->netdev, SIOCGIWAP, &wrqu, NULL);
 949 #endif
 950
 951         return;
 952 out:
 953         cfg80211_put_bss(wdev->wiphy, info->bss);
 954 }
 955
 956 /* Consumes info->bss object one way or another */
 957 void cfg80211_roamed(struct net_device *dev, struct cfg80211_roam_info *info,
 958                      gfp_t gfp)
 959 {
 960         struct wireless_dev *wdev = dev->ieee80211_ptr;
 961         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 962         struct cfg80211_event *ev;
 963         unsigned long flags;
 964         u8 *next;
 965
 966         if (!info->bss) {
 967                 info->bss = cfg80211_get_bss(wdev->wiphy, info->channel,
 968                                              info->bssid, wdev->ssid,
 969                                              wdev->ssid_len,
 970                                              wdev->conn_bss_type,
 971                                              IEEE80211_PRIVACY_ANY);
 972         }
 973
 974         if (WARN_ON(!info->bss))
 975                 return;
 976
 977         ev = kzalloc(sizeof(*ev) + info->req_ie_len + info->resp_ie_len +
 978                      info->fils.kek_len + info->fils.pmk_len +
 979                      (info->fils.pmkid ? WLAN_PMKID_LEN : 0), gfp);
 980         if (!ev) {
 981                 cfg80211_put_bss(wdev->wiphy, info->bss);
 982                 return;
 983         }
 984
 985         ev->type = EVENT_ROAMED;
 986         next = ((u8 *)ev) + sizeof(*ev);
 987         if (info->req_ie_len) {
 988                 ev->rm.req_ie = next;
 989                 ev->rm.req_ie_len = info->req_ie_len;
 990                 memcpy((void *)ev->rm.req_ie, info->req_ie, info->req_ie_len);
 991                 next += info->req_ie_len;
 992         }
 993         if (info->resp_ie_len) {
 994                 ev->rm.resp_ie = next;
 995                 ev->rm.resp_ie_len = info->resp_ie_len;
 996                 memcpy((void *)ev->rm.resp_ie, info->resp_ie,
 997                        info->resp_ie_len);
 998                 next += info->resp_ie_len;
 999         }
1000         if (info->fils.kek_len) {
1001                 ev->rm.fils.kek = next;
1002                 ev->rm.fils.kek_len = info->fils.kek_len;
1003                 memcpy((void *)ev->rm.fils.kek, info->fils.kek,
1004                        info->fils.kek_len);
1005                 next += info->fils.kek_len;
1006         }
1007         if (info->fils.pmk_len) {
1008                 ev->rm.fils.pmk = next;
1009                 ev->rm.fils.pmk_len = info->fils.pmk_len;
1010                 memcpy((void *)ev->rm.fils.pmk, info->fils.pmk,
1011                        info->fils.pmk_len);
1012                 next += info->fils.pmk_len;
1013         }
1014         if (info->fils.pmkid) {
1015                 ev->rm.fils.pmkid = next;
1016                 memcpy((void *)ev->rm.fils.pmkid, info->fils.pmkid,
1017                        WLAN_PMKID_LEN);
1018                 next += WLAN_PMKID_LEN;
1019         }
1020         ev->rm.fils.update_erp_next_seq_num = info->fils.update_erp_next_seq_num;
1021         if (info->fils.update_erp_next_seq_num)
1022                 ev->rm.fils.erp_next_seq_num = info->fils.erp_next_seq_num;
1023         ev->rm.bss = info->bss;
1024
1025         spin_lock_irqsave(&wdev->event_lock, flags);
1026         list_add_tail(&ev->list, &wdev->event_list);
1027         spin_unlock_irqrestore(&wdev->event_lock, flags);
1028         queue_work(cfg80211_wq, &rdev->event_work);
1029 }
1030 EXPORT_SYMBOL(cfg80211_roamed);
1031
1032 void __cfg80211_port_authorized(struct wireless_dev *wdev, const u8 *bssid)
1033 {
1034         ASSERT_WDEV_LOCK(wdev);
1035
1036         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
1037                 return;
1038
1039         if (WARN_ON(!wdev->current_bss) ||
1040             WARN_ON(!ether_addr_equal(wdev->current_bss->pub.bssid, bssid)))
1041                 return;
1042
1043         nl80211_send_port_authorized(wiphy_to_rdev(wdev->wiphy), wdev->netdev,
1044                                      bssid);
1045 }
1046
1047 void cfg80211_port_authorized(struct net_device *dev, const u8 *bssid,
1048                               gfp_t gfp)
1049 {
1050         struct wireless_dev *wdev = dev->ieee80211_ptr;
1051         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
1052         struct cfg80211_event *ev;
1053         unsigned long flags;
1054
1055         if (WARN_ON(!bssid))
1056                 return;
1057
1058         ev = kzalloc(sizeof(*ev), gfp);
1059         if (!ev)
1060                 return;
1061
1062         ev->type = EVENT_PORT_AUTHORIZED;
1063         memcpy(ev->pa.bssid, bssid, ETH_ALEN);
1064
1065         /*
1066          * Use the wdev event list so that if there are pending
1067          * connected/roamed events, they will be reported first.
1068          */
1069         spin_lock_irqsave(&wdev->event_lock, flags);
1070         list_add_tail(&ev->list, &wdev->event_list);
1071         spin_unlock_irqrestore(&wdev->event_lock, flags);
1072         queue_work(cfg80211_wq, &rdev->event_work);
1073 }
1074 EXPORT_SYMBOL(cfg80211_port_authorized);
1075
1076 void __cfg80211_disconnected(struct net_device *dev, const u8 *ie,
1077                              size_t ie_len, u16 reason, bool from_ap)
1078 {
1079         struct wireless_dev *wdev = dev->ieee80211_ptr;
1080         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
1081         int i;
1082 #ifdef CONFIG_CFG80211_WEXT
1083         union iwreq_data wrqu;
1084 #endif
1085
1086         ASSERT_WDEV_LOCK(wdev);
1087
1088         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION &&
1089                     wdev->iftype != NL80211_IFTYPE_P2P_CLIENT))
1090                 return;
1091
1092         if (wdev->current_bss) {
1093                 cfg80211_unhold_bss(wdev->current_bss);
1094                 cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
1095         }
1096
1097         wdev->current_bss = NULL;
1098         wdev->ssid_len = 0;
1099         wdev->conn_owner_nlportid = 0;
1100         kfree_sensitive(wdev->connect_keys);
1101         wdev->connect_keys = NULL;
1102
1103         nl80211_send_disconnected(rdev, dev, reason, ie, ie_len, from_ap);
1104
1105         /* stop critical protocol if supported */
1106         if (rdev->ops->crit_proto_stop && rdev->crit_proto_nlportid) {
1107                 rdev->crit_proto_nlportid = 0;
1108                 rdev_crit_proto_stop(rdev, wdev);
1109         }
1110
1111         /*
1112          * Delete all the keys ... pairwise keys can't really
1113          * exist any more anyway, but default keys might.
1114          */
1115         if (rdev->ops->del_key) {
1116                 int max_key_idx = 5;
1117
1118                 if (wiphy_ext_feature_isset(
1119                             wdev->wiphy,
1120                             NL80211_EXT_FEATURE_BEACON_PROTECTION) ||
1121                     wiphy_ext_feature_isset(
1122                             wdev->wiphy,
1123                             NL80211_EXT_FEATURE_BEACON_PROTECTION_CLIENT))
1124                         max_key_idx = 7;
1125                 for (i = 0; i <= max_key_idx; i++)
1126                         rdev_del_key(rdev, dev, i, false, NULL);
1127         }
1128
1129         rdev_set_qos_map(rdev, dev, NULL);
1130
1131 #ifdef CONFIG_CFG80211_WEXT
1132         memset(&wrqu, 0, sizeof(wrqu));
1133         wrqu.ap_addr.sa_family = ARPHRD_ETHER;
1134         wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL);
1135         wdev->wext.connect.ssid_len = 0;
1136 #endif
1137
1138         schedule_work(&cfg80211_disconnect_work);
1139 }
1140
1141 void cfg80211_disconnected(struct net_device *dev, u16 reason,
1142                            const u8 *ie, size_t ie_len,
1143                            bool locally_generated, gfp_t gfp)
1144 {
1145         struct wireless_dev *wdev = dev->ieee80211_ptr;
1146         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
1147         struct cfg80211_event *ev;
1148         unsigned long flags;
1149
1150         ev = kzalloc(sizeof(*ev) + ie_len, gfp);
1151         if (!ev)
1152                 return;
1153
1154         ev->type = EVENT_DISCONNECTED;
1155         ev->dc.ie = ((u8 *)ev) + sizeof(*ev);
1156         ev->dc.ie_len = ie_len;
1157         memcpy((void *)ev->dc.ie, ie, ie_len);
1158         ev->dc.reason = reason;
1159         ev->dc.locally_generated = locally_generated;
1160
1161         spin_lock_irqsave(&wdev->event_lock, flags);
1162         list_add_tail(&ev->list, &wdev->event_list);
1163         spin_unlock_irqrestore(&wdev->event_lock, flags);
1164         queue_work(cfg80211_wq, &rdev->event_work);
1165 }
1166 EXPORT_SYMBOL(cfg80211_disconnected);
1167
1168 /*
1169  * API calls for nl80211/wext compatibility code
1170  */
1171 int cfg80211_connect(struct cfg80211_registered_device *rdev,
1172                      struct net_device *dev,
1173                      struct cfg80211_connect_params *connect,
1174                      struct cfg80211_cached_keys *connkeys,
1175                      const u8 *prev_bssid)
1176 {
1177         struct wireless_dev *wdev = dev->ieee80211_ptr;
1178         int err;
1179
1180         ASSERT_WDEV_LOCK(wdev);
1181
1182         /*
1183          * If we have an ssid_len, we're trying to connect or are
1184          * already connected, so reject a new SSID unless it's the
1185          * same (which is the case for re-association.)
1186          */
1187         if (wdev->ssid_len &&
1188             (wdev->ssid_len != connect->ssid_len ||
1189              memcmp(wdev->ssid, connect->ssid, wdev->ssid_len)))
1190                 return -EALREADY;
1191
1192         /*
1193          * If connected, reject (re-)association unless prev_bssid
1194          * matches the current BSSID.
1195          */
1196         if (wdev->current_bss) {
1197                 if (!prev_bssid)
1198                         return -EALREADY;
1199                 if (!ether_addr_equal(prev_bssid, wdev->current_bss->pub.bssid))
1200                         return -ENOTCONN;
1201         }
1202
1203         /*
1204          * Reject if we're in the process of connecting with WEP,
1205          * this case isn't very interesting and trying to handle
1206          * it would make the code much more complex.
1207          */
1208         if (wdev->connect_keys)
1209                 return -EINPROGRESS;
1210
1211         cfg80211_oper_and_ht_capa(&connect->ht_capa_mask,
1212                                   rdev->wiphy.ht_capa_mod_mask);
1213         cfg80211_oper_and_vht_capa(&connect->vht_capa_mask,
1214                                    rdev->wiphy.vht_capa_mod_mask);
1215
1216         if (connkeys && connkeys->def >= 0) {
1217                 int idx;
1218                 u32 cipher;
1219
1220                 idx = connkeys->def;
1221                 cipher = connkeys->params[idx].cipher;
1222                 /* If given a WEP key we may need it for shared key auth */
1223                 if (cipher == WLAN_CIPHER_SUITE_WEP40 ||
1224                     cipher == WLAN_CIPHER_SUITE_WEP104) {
1225                         connect->key_idx = idx;
1226                         connect->key = connkeys->params[idx].key;
1227                         connect->key_len = connkeys->params[idx].key_len;
1228
1229                         /*
1230                          * If ciphers are not set (e.g. when going through
1231                          * iwconfig), we have to set them appropriately here.
1232                          */
1233                         if (connect->crypto.cipher_group == 0)
1234                                 connect->crypto.cipher_group = cipher;
1235
1236                         if (connect->crypto.n_ciphers_pairwise == 0) {
1237                                 connect->crypto.n_ciphers_pairwise = 1;
1238                                 connect->crypto.ciphers_pairwise[0] = cipher;
1239                         }
1240                 }
1241
1242                 connect->crypto.wep_keys = connkeys->params;
1243                 connect->crypto.wep_tx_key = connkeys->def;
1244         } else {
1245                 if (WARN_ON(connkeys))
1246                         return -EINVAL;
1247         }
1248
1249         wdev->connect_keys = connkeys;
1250         memcpy(wdev->ssid, connect->ssid, connect->ssid_len);
1251         wdev->ssid_len = connect->ssid_len;
1252
1253         wdev->conn_bss_type = connect->pbss ? IEEE80211_BSS_TYPE_PBSS :
1254                                               IEEE80211_BSS_TYPE_ESS;
1255
1256         if (!rdev->ops->connect)
1257                 err = cfg80211_sme_connect(wdev, connect, prev_bssid);
1258         else
1259                 err = rdev_connect(rdev, dev, connect);
1260
1261         if (err) {
1262                 wdev->connect_keys = NULL;
1263                 /*
1264                  * This could be reassoc getting refused, don't clear
1265                  * ssid_len in that case.
1266                  */
1267                 if (!wdev->current_bss)
1268                         wdev->ssid_len = 0;
1269                 return err;
1270         }
1271
1272         return 0;
1273 }
1274
1275 int cfg80211_disconnect(struct cfg80211_registered_device *rdev,
1276                         struct net_device *dev, u16 reason, bool wextev)
1277 {
1278         struct wireless_dev *wdev = dev->ieee80211_ptr;
1279         int err = 0;
1280
1281         ASSERT_WDEV_LOCK(wdev);
1282
1283         kfree_sensitive(wdev->connect_keys);
1284         wdev->connect_keys = NULL;
1285
1286         wdev->conn_owner_nlportid = 0;
1287
1288         if (wdev->conn)
1289                 err = cfg80211_sme_disconnect(wdev, reason);
1290         else if (!rdev->ops->disconnect)
1291                 cfg80211_mlme_down(rdev, dev);
1292         else if (wdev->ssid_len)
1293                 err = rdev_disconnect(rdev, dev, reason);
1294
1295         /*
1296          * Clear ssid_len unless we actually were fully connected,
1297          * in which case cfg80211_disconnected() will take care of
1298          * this later.
1299          */
1300         if (!wdev->current_bss)
1301                 wdev->ssid_len = 0;
1302
1303         return err;
1304 }
1305
1306 /*
1307  * Used to clean up after the connection / connection attempt owner socket
1308  * disconnects
1309  */
1310 void cfg80211_autodisconnect_wk(struct work_struct *work)
1311 {
1312         struct wireless_dev *wdev =
1313                 container_of(work, struct wireless_dev, disconnect_wk);
1314         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
1315
1316         wdev_lock(wdev);
1317
1318         if (wdev->conn_owner_nlportid) {
1319                 switch (wdev->iftype) {
1320                 case NL80211_IFTYPE_ADHOC:
1321                         __cfg80211_leave_ibss(rdev, wdev->netdev, false);
1322                         break;
1323                 case NL80211_IFTYPE_AP:
1324                 case NL80211_IFTYPE_P2P_GO:
1325                         __cfg80211_stop_ap(rdev, wdev->netdev, false);
1326                         break;
1327                 case NL80211_IFTYPE_MESH_POINT:
1328                         __cfg80211_leave_mesh(rdev, wdev->netdev);
1329                         break;
1330                 case NL80211_IFTYPE_STATION:
1331                 case NL80211_IFTYPE_P2P_CLIENT:
1332                         /*
1333                          * Use disconnect_bssid if still connecting and
1334                          * ops->disconnect not implemented.  Otherwise we can
1335                          * use cfg80211_disconnect.
1336                          */
1337                         if (rdev->ops->disconnect || wdev->current_bss)
1338                                 cfg80211_disconnect(rdev, wdev->netdev,
1339                                                     WLAN_REASON_DEAUTH_LEAVING,
1340                                                     true);
1341                         else
1342                                 cfg80211_mlme_deauth(rdev, wdev->netdev,
1343                                                      wdev->disconnect_bssid,
1344                                                      NULL, 0,
1345                                                      WLAN_REASON_DEAUTH_LEAVING,
1346                                                      false);
1347                         break;
1348                 default:
1349                         break;
1350                 }
1351         }
1352
1353         wdev_unlock(wdev);
1354 }