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 <[email protected]>
   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 struct element *country_elem;
 684         const u8 *country_data;
 685         u8 country_datalen;
 686 #ifdef CONFIG_CFG80211_WEXT
 687         union iwreq_data wrqu;
 688 #endif
 689
 690         ASSERT_WDEV_LOCK(wdev);
 691
 692         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION &&
 693                     wdev->iftype != NL80211_IFTYPE_P2P_CLIENT)) {
 694                 cfg80211_put_bss(wdev->wiphy, cr->bss);
 695                 return;
 696         }
 697
 698         wdev->unprot_beacon_reported = 0;
 699         nl80211_send_connect_result(wiphy_to_rdev(wdev->wiphy), dev, cr,
 700                                     GFP_KERNEL);
 701
 702 #ifdef CONFIG_CFG80211_WEXT
 703         if (wextev) {
 704                 if (cr->req_ie && cr->status == WLAN_STATUS_SUCCESS) {
 705                         memset(&wrqu, 0, sizeof(wrqu));
 706                         wrqu.data.length = cr->req_ie_len;
 707                         wireless_send_event(dev, IWEVASSOCREQIE, &wrqu,
 708                                             cr->req_ie);
 709                 }
 710
 711                 if (cr->resp_ie && cr->status == WLAN_STATUS_SUCCESS) {
 712                         memset(&wrqu, 0, sizeof(wrqu));
 713                         wrqu.data.length = cr->resp_ie_len;
 714                         wireless_send_event(dev, IWEVASSOCRESPIE, &wrqu,
 715                                             cr->resp_ie);
 716                 }
 717
 718                 memset(&wrqu, 0, sizeof(wrqu));
 719                 wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 720                 if (cr->bssid && cr->status == WLAN_STATUS_SUCCESS) {
 721                         memcpy(wrqu.ap_addr.sa_data, cr->bssid, ETH_ALEN);
 722                         memcpy(wdev->wext.prev_bssid, cr->bssid, ETH_ALEN);
 723                         wdev->wext.prev_bssid_valid = true;
 724                 }
 725                 wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL);
 726         }
 727 #endif
 728
 729         if (!cr->bss && (cr->status == WLAN_STATUS_SUCCESS)) {
 730                 WARN_ON_ONCE(!wiphy_to_rdev(wdev->wiphy)->ops->connect);
 731                 cr->bss = cfg80211_get_bss(wdev->wiphy, NULL, cr->bssid,
 732                                            wdev->ssid, wdev->ssid_len,
 733                                            wdev->conn_bss_type,
 734                                            IEEE80211_PRIVACY_ANY);
 735                 if (cr->bss)
 736                         cfg80211_hold_bss(bss_from_pub(cr->bss));
 737         }
 738
 739         if (wdev->current_bss) {
 740                 cfg80211_unhold_bss(wdev->current_bss);
 741                 cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
 742                 wdev->current_bss = NULL;
 743         }
 744
 745         if (cr->status != WLAN_STATUS_SUCCESS) {
 746                 kfree_sensitive(wdev->connect_keys);
 747                 wdev->connect_keys = NULL;
 748                 wdev->ssid_len = 0;
 749                 wdev->conn_owner_nlportid = 0;
 750                 if (cr->bss) {
 751                         cfg80211_unhold_bss(bss_from_pub(cr->bss));
 752                         cfg80211_put_bss(wdev->wiphy, cr->bss);
 753                 }
 754                 cfg80211_sme_free(wdev);
 755                 return;
 756         }
 757
 758         if (WARN_ON(!cr->bss))
 759                 return;
 760
 761         wdev->current_bss = bss_from_pub(cr->bss);
 762
 763         if (!(wdev->wiphy->flags & WIPHY_FLAG_HAS_STATIC_WEP))
 764                 cfg80211_upload_connect_keys(wdev);
 765
 766         rcu_read_lock();
 767         country_elem = ieee80211_bss_get_elem(cr->bss, WLAN_EID_COUNTRY);
 768         if (!country_elem) {
 769                 rcu_read_unlock();
 770                 return;
 771         }
 772
 773         country_datalen = country_elem->datalen;
 774         country_data = kmemdup(country_elem->data, country_datalen, GFP_ATOMIC);
 775         rcu_read_unlock();
 776
 777         if (!country_data)
 778                 return;
 779
 780         regulatory_hint_country_ie(wdev->wiphy, cr->bss->channel->band,
 781                                    country_data, country_datalen);
 782         kfree(country_data);
 783 }
 784
 785 /* Consumes bss object one way or another */
 786 void cfg80211_connect_done(struct net_device *dev,
 787                            struct cfg80211_connect_resp_params *params,
 788                            gfp_t gfp)
 789 {
 790         struct wireless_dev *wdev = dev->ieee80211_ptr;
 791         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 792         struct cfg80211_event *ev;
 793         unsigned long flags;
 794         u8 *next;
 795
 796         if (params->bss) {
 797                 struct cfg80211_internal_bss *ibss = bss_from_pub(params->bss);
 798
 799                 if (list_empty(&ibss->list)) {
 800                         struct cfg80211_bss *found = NULL, *tmp = params->bss;
 801
 802                         found = cfg80211_get_bss(wdev->wiphy, NULL,
 803                                                  params->bss->bssid,
 804                                                  wdev->ssid, wdev->ssid_len,
 805                                                  wdev->conn_bss_type,
 806                                                  IEEE80211_PRIVACY_ANY);
 807                         if (found) {
 808                                 /* The same BSS is already updated so use it
 809                                  * instead, as it has latest info.
 810                                  */
 811                                 params->bss = found;
 812                         } else {
 813                                 /* Update with BSS provided by driver, it will
 814                                  * be freshly added and ref cnted, we can free
 815                                  * the old one.
 816                                  *
 817                                  * signal_valid can be false, as we are not
 818                                  * expecting the BSS to be found.
 819                                  *
 820                                  * keep the old timestamp to avoid confusion
 821                                  */
 822                                 cfg80211_bss_update(rdev, ibss, false,
 823                                                     ibss->ts);
 824                         }
 825
 826                         cfg80211_put_bss(wdev->wiphy, tmp);
 827                 }
 828         }
 829
 830         ev = kzalloc(sizeof(*ev) + (params->bssid ? ETH_ALEN : 0) +
 831                      params->req_ie_len + params->resp_ie_len +
 832                      params->fils.kek_len + params->fils.pmk_len +
 833                      (params->fils.pmkid ? WLAN_PMKID_LEN : 0), gfp);
 834         if (!ev) {
 835                 cfg80211_put_bss(wdev->wiphy, params->bss);
 836                 return;
 837         }
 838
 839         ev->type = EVENT_CONNECT_RESULT;
 840         next = ((u8 *)ev) + sizeof(*ev);
 841         if (params->bssid) {
 842                 ev->cr.bssid = next;
 843                 memcpy((void *)ev->cr.bssid, params->bssid, ETH_ALEN);
 844                 next += ETH_ALEN;
 845         }
 846         if (params->req_ie_len) {
 847                 ev->cr.req_ie = next;
 848                 ev->cr.req_ie_len = params->req_ie_len;
 849                 memcpy((void *)ev->cr.req_ie, params->req_ie,
 850                        params->req_ie_len);
 851                 next += params->req_ie_len;
 852         }
 853         if (params->resp_ie_len) {
 854                 ev->cr.resp_ie = next;
 855                 ev->cr.resp_ie_len = params->resp_ie_len;
 856                 memcpy((void *)ev->cr.resp_ie, params->resp_ie,
 857                        params->resp_ie_len);
 858                 next += params->resp_ie_len;
 859         }
 860         if (params->fils.kek_len) {
 861                 ev->cr.fils.kek = next;
 862                 ev->cr.fils.kek_len = params->fils.kek_len;
 863                 memcpy((void *)ev->cr.fils.kek, params->fils.kek,
 864                        params->fils.kek_len);
 865                 next += params->fils.kek_len;
 866         }
 867         if (params->fils.pmk_len) {
 868                 ev->cr.fils.pmk = next;
 869                 ev->cr.fils.pmk_len = params->fils.pmk_len;
 870                 memcpy((void *)ev->cr.fils.pmk, params->fils.pmk,
 871                        params->fils.pmk_len);
 872                 next += params->fils.pmk_len;
 873         }
 874         if (params->fils.pmkid) {
 875                 ev->cr.fils.pmkid = next;
 876                 memcpy((void *)ev->cr.fils.pmkid, params->fils.pmkid,
 877                        WLAN_PMKID_LEN);
 878                 next += WLAN_PMKID_LEN;
 879         }
 880         ev->cr.fils.update_erp_next_seq_num = params->fils.update_erp_next_seq_num;
 881         if (params->fils.update_erp_next_seq_num)
 882                 ev->cr.fils.erp_next_seq_num = params->fils.erp_next_seq_num;
 883         if (params->bss)
 884                 cfg80211_hold_bss(bss_from_pub(params->bss));
 885         ev->cr.bss = params->bss;
 886         ev->cr.status = params->status;
 887         ev->cr.timeout_reason = params->timeout_reason;
 888
 889         spin_lock_irqsave(&wdev->event_lock, flags);
 890         list_add_tail(&ev->list, &wdev->event_list);
 891         spin_unlock_irqrestore(&wdev->event_lock, flags);
 892         queue_work(cfg80211_wq, &rdev->event_work);
 893 }
 894 EXPORT_SYMBOL(cfg80211_connect_done);
 895
 896 /* Consumes bss object one way or another */
 897 void __cfg80211_roamed(struct wireless_dev *wdev,
 898                        struct cfg80211_roam_info *info)
 899 {
 900 #ifdef CONFIG_CFG80211_WEXT
 901         union iwreq_data wrqu;
 902 #endif
 903         ASSERT_WDEV_LOCK(wdev);
 904
 905         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION &&
 906                     wdev->iftype != NL80211_IFTYPE_P2P_CLIENT))
 907                 goto out;
 908
 909         if (WARN_ON(!wdev->current_bss))
 910                 goto out;
 911
 912         cfg80211_unhold_bss(wdev->current_bss);
 913         cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
 914         wdev->current_bss = NULL;
 915
 916         if (WARN_ON(!info->bss))
 917                 return;
 918
 919         cfg80211_hold_bss(bss_from_pub(info->bss));
 920         wdev->current_bss = bss_from_pub(info->bss);
 921
 922         wdev->unprot_beacon_reported = 0;
 923         nl80211_send_roamed(wiphy_to_rdev(wdev->wiphy),
 924                             wdev->netdev, info, GFP_KERNEL);
 925
 926 #ifdef CONFIG_CFG80211_WEXT
 927         if (info->req_ie) {
 928                 memset(&wrqu, 0, sizeof(wrqu));
 929                 wrqu.data.length = info->req_ie_len;
 930                 wireless_send_event(wdev->netdev, IWEVASSOCREQIE,
 931                                     &wrqu, info->req_ie);
 932         }
 933
 934         if (info->resp_ie) {
 935                 memset(&wrqu, 0, sizeof(wrqu));
 936                 wrqu.data.length = info->resp_ie_len;
 937                 wireless_send_event(wdev->netdev, IWEVASSOCRESPIE,
 938                                     &wrqu, info->resp_ie);
 939         }
 940
 941         memset(&wrqu, 0, sizeof(wrqu));
 942         wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 943         memcpy(wrqu.ap_addr.sa_data, info->bss->bssid, ETH_ALEN);
 944         memcpy(wdev->wext.prev_bssid, info->bss->bssid, ETH_ALEN);
 945         wdev->wext.prev_bssid_valid = true;
 946         wireless_send_event(wdev->netdev, SIOCGIWAP, &wrqu, NULL);
 947 #endif
 948
 949         return;
 950 out:
 951         cfg80211_put_bss(wdev->wiphy, info->bss);
 952 }
 953
 954 /* Consumes info->bss object one way or another */
 955 void cfg80211_roamed(struct net_device *dev, struct cfg80211_roam_info *info,
 956                      gfp_t gfp)
 957 {
 958         struct wireless_dev *wdev = dev->ieee80211_ptr;
 959         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 960         struct cfg80211_event *ev;
 961         unsigned long flags;
 962         u8 *next;
 963
 964         if (!info->bss) {
 965                 info->bss = cfg80211_get_bss(wdev->wiphy, info->channel,
 966                                              info->bssid, wdev->ssid,
 967                                              wdev->ssid_len,
 968                                              wdev->conn_bss_type,
 969                                              IEEE80211_PRIVACY_ANY);
 970         }
 971
 972         if (WARN_ON(!info->bss))
 973                 return;
 974
 975         ev = kzalloc(sizeof(*ev) + info->req_ie_len + info->resp_ie_len +
 976                      info->fils.kek_len + info->fils.pmk_len +
 977                      (info->fils.pmkid ? WLAN_PMKID_LEN : 0), gfp);
 978         if (!ev) {
 979                 cfg80211_put_bss(wdev->wiphy, info->bss);
 980                 return;
 981         }
 982
 983         ev->type = EVENT_ROAMED;
 984         next = ((u8 *)ev) + sizeof(*ev);
 985         if (info->req_ie_len) {
 986                 ev->rm.req_ie = next;
 987                 ev->rm.req_ie_len = info->req_ie_len;
 988                 memcpy((void *)ev->rm.req_ie, info->req_ie, info->req_ie_len);
 989                 next += info->req_ie_len;
 990         }
 991         if (info->resp_ie_len) {
 992                 ev->rm.resp_ie = next;
 993                 ev->rm.resp_ie_len = info->resp_ie_len;
 994                 memcpy((void *)ev->rm.resp_ie, info->resp_ie,
 995                        info->resp_ie_len);
 996                 next += info->resp_ie_len;
 997         }
 998         if (info->fils.kek_len) {
 999                 ev->rm.fils.kek = next;
1000                 ev->rm.fils.kek_len = info->fils.kek_len;
1001                 memcpy((void *)ev->rm.fils.kek, info->fils.kek,
1002                        info->fils.kek_len);
1003                 next += info->fils.kek_len;
1004         }
1005         if (info->fils.pmk_len) {
1006                 ev->rm.fils.pmk = next;
1007                 ev->rm.fils.pmk_len = info->fils.pmk_len;
1008                 memcpy((void *)ev->rm.fils.pmk, info->fils.pmk,
1009                        info->fils.pmk_len);
1010                 next += info->fils.pmk_len;
1011         }
1012         if (info->fils.pmkid) {
1013                 ev->rm.fils.pmkid = next;
1014                 memcpy((void *)ev->rm.fils.pmkid, info->fils.pmkid,
1015                        WLAN_PMKID_LEN);
1016                 next += WLAN_PMKID_LEN;
1017         }
1018         ev->rm.fils.update_erp_next_seq_num = info->fils.update_erp_next_seq_num;
1019         if (info->fils.update_erp_next_seq_num)
1020                 ev->rm.fils.erp_next_seq_num = info->fils.erp_next_seq_num;
1021         ev->rm.bss = info->bss;
1022
1023         spin_lock_irqsave(&wdev->event_lock, flags);
1024         list_add_tail(&ev->list, &wdev->event_list);
1025         spin_unlock_irqrestore(&wdev->event_lock, flags);
1026         queue_work(cfg80211_wq, &rdev->event_work);
1027 }
1028 EXPORT_SYMBOL(cfg80211_roamed);
1029
1030 void __cfg80211_port_authorized(struct wireless_dev *wdev, const u8 *bssid)
1031 {
1032         ASSERT_WDEV_LOCK(wdev);
1033
1034         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
1035                 return;
1036
1037         if (WARN_ON(!wdev->current_bss) ||
1038             WARN_ON(!ether_addr_equal(wdev->current_bss->pub.bssid, bssid)))
1039                 return;
1040
1041         nl80211_send_port_authorized(wiphy_to_rdev(wdev->wiphy), wdev->netdev,
1042                                      bssid);
1043 }
1044
1045 void cfg80211_port_authorized(struct net_device *dev, const u8 *bssid,
1046                               gfp_t gfp)
1047 {
1048         struct wireless_dev *wdev = dev->ieee80211_ptr;
1049         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
1050         struct cfg80211_event *ev;
1051         unsigned long flags;
1052
1053         if (WARN_ON(!bssid))
1054                 return;
1055
1056         ev = kzalloc(sizeof(*ev), gfp);
1057         if (!ev)
1058                 return;
1059
1060         ev->type = EVENT_PORT_AUTHORIZED;
1061         memcpy(ev->pa.bssid, bssid, ETH_ALEN);
1062
1063         /*
1064          * Use the wdev event list so that if there are pending
1065          * connected/roamed events, they will be reported first.
1066          */
1067         spin_lock_irqsave(&wdev->event_lock, flags);
1068         list_add_tail(&ev->list, &wdev->event_list);
1069         spin_unlock_irqrestore(&wdev->event_lock, flags);
1070         queue_work(cfg80211_wq, &rdev->event_work);
1071 }
1072 EXPORT_SYMBOL(cfg80211_port_authorized);
1073
1074 void __cfg80211_disconnected(struct net_device *dev, const u8 *ie,
1075                              size_t ie_len, u16 reason, bool from_ap)
1076 {
1077         struct wireless_dev *wdev = dev->ieee80211_ptr;
1078         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
1079         int i;
1080 #ifdef CONFIG_CFG80211_WEXT
1081         union iwreq_data wrqu;
1082 #endif
1083
1084         ASSERT_WDEV_LOCK(wdev);
1085
1086         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION &&
1087                     wdev->iftype != NL80211_IFTYPE_P2P_CLIENT))
1088                 return;
1089
1090         if (wdev->current_bss) {
1091                 cfg80211_unhold_bss(wdev->current_bss);
1092                 cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
1093         }
1094
1095         wdev->current_bss = NULL;
1096         wdev->ssid_len = 0;
1097         wdev->conn_owner_nlportid = 0;
1098         kfree_sensitive(wdev->connect_keys);
1099         wdev->connect_keys = NULL;
1100
1101         nl80211_send_disconnected(rdev, dev, reason, ie, ie_len, from_ap);
1102
1103         /* stop critical protocol if supported */
1104         if (rdev->ops->crit_proto_stop && rdev->crit_proto_nlportid) {
1105                 rdev->crit_proto_nlportid = 0;
1106                 rdev_crit_proto_stop(rdev, wdev);
1107         }
1108
1109         /*
1110          * Delete all the keys ... pairwise keys can't really
1111          * exist any more anyway, but default keys might.
1112          */
1113         if (rdev->ops->del_key) {
1114                 int max_key_idx = 5;
1115
1116                 if (wiphy_ext_feature_isset(
1117                             wdev->wiphy,
1118                             NL80211_EXT_FEATURE_BEACON_PROTECTION) ||
1119                     wiphy_ext_feature_isset(
1120                             wdev->wiphy,
1121                             NL80211_EXT_FEATURE_BEACON_PROTECTION_CLIENT))
1122                         max_key_idx = 7;
1123                 for (i = 0; i <= max_key_idx; i++)
1124                         rdev_del_key(rdev, dev, i, false, NULL);
1125         }
1126
1127         rdev_set_qos_map(rdev, dev, NULL);
1128
1129 #ifdef CONFIG_CFG80211_WEXT
1130         memset(&wrqu, 0, sizeof(wrqu));
1131         wrqu.ap_addr.sa_family = ARPHRD_ETHER;
1132         wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL);
1133         wdev->wext.connect.ssid_len = 0;
1134 #endif
1135
1136         schedule_work(&cfg80211_disconnect_work);
1137 }
1138
1139 void cfg80211_disconnected(struct net_device *dev, u16 reason,
1140                            const u8 *ie, size_t ie_len,
1141                            bool locally_generated, gfp_t gfp)
1142 {
1143         struct wireless_dev *wdev = dev->ieee80211_ptr;
1144         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
1145         struct cfg80211_event *ev;
1146         unsigned long flags;
1147
1148         ev = kzalloc(sizeof(*ev) + ie_len, gfp);
1149         if (!ev)
1150                 return;
1151
1152         ev->type = EVENT_DISCONNECTED;
1153         ev->dc.ie = ((u8 *)ev) + sizeof(*ev);
1154         ev->dc.ie_len = ie_len;
1155         memcpy((void *)ev->dc.ie, ie, ie_len);
1156         ev->dc.reason = reason;
1157         ev->dc.locally_generated = locally_generated;
1158
1159         spin_lock_irqsave(&wdev->event_lock, flags);
1160         list_add_tail(&ev->list, &wdev->event_list);
1161         spin_unlock_irqrestore(&wdev->event_lock, flags);
1162         queue_work(cfg80211_wq, &rdev->event_work);
1163 }
1164 EXPORT_SYMBOL(cfg80211_disconnected);
1165
1166 /*
1167  * API calls for nl80211/wext compatibility code
1168  */
1169 int cfg80211_connect(struct cfg80211_registered_device *rdev,
1170                      struct net_device *dev,
1171                      struct cfg80211_connect_params *connect,
1172                      struct cfg80211_cached_keys *connkeys,
1173                      const u8 *prev_bssid)
1174 {
1175         struct wireless_dev *wdev = dev->ieee80211_ptr;
1176         int err;
1177
1178         ASSERT_WDEV_LOCK(wdev);
1179
1180         /*
1181          * If we have an ssid_len, we're trying to connect or are
1182          * already connected, so reject a new SSID unless it's the
1183          * same (which is the case for re-association.)
1184          */
1185         if (wdev->ssid_len &&
1186             (wdev->ssid_len != connect->ssid_len ||
1187              memcmp(wdev->ssid, connect->ssid, wdev->ssid_len)))
1188                 return -EALREADY;
1189
1190         /*
1191          * If connected, reject (re-)association unless prev_bssid
1192          * matches the current BSSID.
1193          */
1194         if (wdev->current_bss) {
1195                 if (!prev_bssid)
1196                         return -EALREADY;
1197                 if (!ether_addr_equal(prev_bssid, wdev->current_bss->pub.bssid))
1198                         return -ENOTCONN;
1199         }
1200
1201         /*
1202          * Reject if we're in the process of connecting with WEP,
1203          * this case isn't very interesting and trying to handle
1204          * it would make the code much more complex.
1205          */
1206         if (wdev->connect_keys)
1207                 return -EINPROGRESS;
1208
1209         cfg80211_oper_and_ht_capa(&connect->ht_capa_mask,
1210                                   rdev->wiphy.ht_capa_mod_mask);
1211         cfg80211_oper_and_vht_capa(&connect->vht_capa_mask,
1212                                    rdev->wiphy.vht_capa_mod_mask);
1213
1214         if (connkeys && connkeys->def >= 0) {
1215                 int idx;
1216                 u32 cipher;
1217
1218                 idx = connkeys->def;
1219                 cipher = connkeys->params[idx].cipher;
1220                 /* If given a WEP key we may need it for shared key auth */
1221                 if (cipher == WLAN_CIPHER_SUITE_WEP40 ||
1222                     cipher == WLAN_CIPHER_SUITE_WEP104) {
1223                         connect->key_idx = idx;
1224                         connect->key = connkeys->params[idx].key;
1225                         connect->key_len = connkeys->params[idx].key_len;
1226
1227                         /*
1228                          * If ciphers are not set (e.g. when going through
1229                          * iwconfig), we have to set them appropriately here.
1230                          */
1231                         if (connect->crypto.cipher_group == 0)
1232                                 connect->crypto.cipher_group = cipher;
1233
1234                         if (connect->crypto.n_ciphers_pairwise == 0) {
1235                                 connect->crypto.n_ciphers_pairwise = 1;
1236                                 connect->crypto.ciphers_pairwise[0] = cipher;
1237                         }
1238                 }
1239
1240                 connect->crypto.wep_keys = connkeys->params;
1241                 connect->crypto.wep_tx_key = connkeys->def;
1242         } else {
1243                 if (WARN_ON(connkeys))
1244                         return -EINVAL;
1245         }
1246
1247         wdev->connect_keys = connkeys;
1248         memcpy(wdev->ssid, connect->ssid, connect->ssid_len);
1249         wdev->ssid_len = connect->ssid_len;
1250
1251         wdev->conn_bss_type = connect->pbss ? IEEE80211_BSS_TYPE_PBSS :
1252                                               IEEE80211_BSS_TYPE_ESS;
1253
1254         if (!rdev->ops->connect)
1255                 err = cfg80211_sme_connect(wdev, connect, prev_bssid);
1256         else
1257                 err = rdev_connect(rdev, dev, connect);
1258
1259         if (err) {
1260                 wdev->connect_keys = NULL;
1261                 /*
1262                  * This could be reassoc getting refused, don't clear
1263                  * ssid_len in that case.
1264                  */
1265                 if (!wdev->current_bss)
1266                         wdev->ssid_len = 0;
1267                 return err;
1268         }
1269
1270         return 0;
1271 }
1272
1273 int cfg80211_disconnect(struct cfg80211_registered_device *rdev,
1274                         struct net_device *dev, u16 reason, bool wextev)
1275 {
1276         struct wireless_dev *wdev = dev->ieee80211_ptr;
1277         int err = 0;
1278
1279         ASSERT_WDEV_LOCK(wdev);
1280
1281         kfree_sensitive(wdev->connect_keys);
1282         wdev->connect_keys = NULL;
1283
1284         wdev->conn_owner_nlportid = 0;
1285
1286         if (wdev->conn)
1287                 err = cfg80211_sme_disconnect(wdev, reason);
1288         else if (!rdev->ops->disconnect)
1289                 cfg80211_mlme_down(rdev, dev);
1290         else if (wdev->ssid_len)
1291                 err = rdev_disconnect(rdev, dev, reason);
1292
1293         /*
1294          * Clear ssid_len unless we actually were fully connected,
1295          * in which case cfg80211_disconnected() will take care of
1296          * this later.
1297          */
1298         if (!wdev->current_bss)
1299                 wdev->ssid_len = 0;
1300
1301         return err;
1302 }
1303
1304 /*
1305  * Used to clean up after the connection / connection attempt owner socket
1306  * disconnects
1307  */
1308 void cfg80211_autodisconnect_wk(struct work_struct *work)
1309 {
1310         struct wireless_dev *wdev =
1311                 container_of(work, struct wireless_dev, disconnect_wk);
1312         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
1313
1314         wdev_lock(wdev);
1315
1316         if (wdev->conn_owner_nlportid) {
1317                 switch (wdev->iftype) {
1318                 case NL80211_IFTYPE_ADHOC:
1319                         __cfg80211_leave_ibss(rdev, wdev->netdev, false);
1320                         break;
1321                 case NL80211_IFTYPE_AP:
1322                 case NL80211_IFTYPE_P2P_GO:
1323                         __cfg80211_stop_ap(rdev, wdev->netdev, false);
1324                         break;
1325                 case NL80211_IFTYPE_MESH_POINT:
1326                         __cfg80211_leave_mesh(rdev, wdev->netdev);
1327                         break;
1328                 case NL80211_IFTYPE_STATION:
1329                 case NL80211_IFTYPE_P2P_CLIENT:
1330                         /*
1331                          * Use disconnect_bssid if still connecting and
1332                          * ops->disconnect not implemented.  Otherwise we can
1333                          * use cfg80211_disconnect.
1334                          */
1335                         if (rdev->ops->disconnect || wdev->current_bss)
1336                                 cfg80211_disconnect(rdev, wdev->netdev,
1337                                                     WLAN_REASON_DEAUTH_LEAVING,
1338                                                     true);
1339                         else
1340                                 cfg80211_mlme_deauth(rdev, wdev->netdev,
1341                                                      wdev->disconnect_bssid,
1342                                                      NULL, 0,
1343                                                      WLAN_REASON_DEAUTH_LEAVING,
1344                                                      false);
1345                         break;
1346                 default:
1347                         break;
1348                 }
1349         }
1350
1351         wdev_unlock(wdev);
1352 }