net/wireless/sme.c

   1 /*
   2  * SME code for cfg80211
   3  * both driver SME event handling and the SME implementation
   4  * (for nl80211's connect() and wext)
   5  *
   6  * Copyright 2009       Johannes Berg <johannes@sipsolutions.net>
   7  * Copyright (C) 2009   Intel Corporation. All rights reserved.
   8  */
   9
  10 #include <linux/etherdevice.h>
  11 #include <linux/if_arp.h>
  12 #include <linux/slab.h>
  13 #include <linux/workqueue.h>
  14 #include <linux/wireless.h>
  15 #include <linux/export.h>
  16 #include <net/iw_handler.h>
  17 #include <net/cfg80211.h>
  18 #include <net/rtnetlink.h>
  19 #include "nl80211.h"
  20 #include "reg.h"
  21 #include "rdev-ops.h"
  22
  23 /*
  24  * Software SME in cfg80211, using auth/assoc/deauth calls to the
  25  * driver. This is is for implementing nl80211's connect/disconnect
  26  * and wireless extensions (if configured.)
  27  */
  28
  29 struct cfg80211_conn {
  30         struct cfg80211_connect_params params;
  31         /* these are sub-states of the _CONNECTING sme_state */
  32         enum {
  33                 CFG80211_CONN_SCANNING,
  34                 CFG80211_CONN_SCAN_AGAIN,
  35                 CFG80211_CONN_AUTHENTICATE_NEXT,
  36                 CFG80211_CONN_AUTHENTICATING,
  37                 CFG80211_CONN_AUTH_FAILED_TIMEOUT,
  38                 CFG80211_CONN_ASSOCIATE_NEXT,
  39                 CFG80211_CONN_ASSOCIATING,
  40                 CFG80211_CONN_ASSOC_FAILED,
  41                 CFG80211_CONN_ASSOC_FAILED_TIMEOUT,
  42                 CFG80211_CONN_DEAUTH,
  43                 CFG80211_CONN_ABANDON,
  44                 CFG80211_CONN_CONNECTED,
  45         } state;
  46         u8 bssid[ETH_ALEN], prev_bssid[ETH_ALEN];
  47         const u8 *ie;
  48         size_t ie_len;
  49         bool auto_auth, prev_bssid_valid;
  50 };
  51
  52 static void cfg80211_sme_free(struct wireless_dev *wdev)
  53 {
  54         if (!wdev->conn)
  55                 return;
  56
  57         kfree(wdev->conn->ie);
  58         kfree(wdev->conn);
  59         wdev->conn = NULL;
  60 }
  61
  62 static int cfg80211_conn_scan(struct wireless_dev *wdev)
  63 {
  64         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
  65         struct cfg80211_scan_request *request;
  66         int n_channels, err;
  67
  68         ASSERT_RTNL();
  69         ASSERT_WDEV_LOCK(wdev);
  70
  71         if (rdev->scan_req || rdev->scan_msg)
  72                 return -EBUSY;
  73
  74         if (wdev->conn->params.channel)
  75                 n_channels = 1;
  76         else
  77                 n_channels = ieee80211_get_num_supported_channels(wdev->wiphy);
  78
  79         request = kzalloc(sizeof(*request) + sizeof(request->ssids[0]) +
  80                           sizeof(request->channels[0]) * n_channels,
  81                           GFP_KERNEL);
  82         if (!request)
  83                 return -ENOMEM;
  84
  85         if (wdev->conn->params.channel) {
  86                 enum nl80211_band band = wdev->conn->params.channel->band;
  87                 struct ieee80211_supported_band *sband =
  88                         wdev->wiphy->bands[band];
  89
  90                 if (!sband) {
  91                         kfree(request);
  92                         return -EINVAL;
  93                 }
  94                 request->channels[0] = wdev->conn->params.channel;
  95                 request->rates[band] = (1 << sband->n_bitrates) - 1;
  96         } else {
  97                 int i = 0, j;
  98                 enum nl80211_band band;
  99                 struct ieee80211_supported_band *bands;
 100                 struct ieee80211_channel *channel;
 101
 102                 for (band = 0; band < NUM_NL80211_BANDS; band++) {
 103                         bands = wdev->wiphy->bands[band];
 104                         if (!bands)
 105                                 continue;
 106                         for (j = 0; j < bands->n_channels; j++) {
 107                                 channel = &bands->channels[j];
 108                                 if (channel->flags & IEEE80211_CHAN_DISABLED)
 109                                         continue;
 110                                 request->channels[i++] = channel;
 111                         }
 112                         request->rates[band] = (1 << bands->n_bitrates) - 1;
 113                 }
 114                 n_channels = i;
 115         }
 116         request->n_channels = n_channels;
 117         request->ssids = (void *)&request->channels[n_channels];
 118         request->n_ssids = 1;
 119
 120         memcpy(request->ssids[0].ssid, wdev->conn->params.ssid,
 121                 wdev->conn->params.ssid_len);
 122         request->ssids[0].ssid_len = wdev->conn->params.ssid_len;
 123
 124         eth_broadcast_addr(request->bssid);
 125
 126         request->wdev = wdev;
 127         request->wiphy = &rdev->wiphy;
 128         request->scan_start = jiffies;
 129
 130         rdev->scan_req = request;
 131
 132         err = rdev_scan(rdev, request);
 133         if (!err) {
 134                 wdev->conn->state = CFG80211_CONN_SCANNING;
 135                 nl80211_send_scan_start(rdev, wdev);
 136                 dev_hold(wdev->netdev);
 137         } else {
 138                 rdev->scan_req = NULL;
 139                 kfree(request);
 140         }
 141         return err;
 142 }
 143
 144 static int cfg80211_conn_do_work(struct wireless_dev *wdev,
 145                                  enum nl80211_timeout_reason *treason)
 146 {
 147         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 148         struct cfg80211_connect_params *params;
 149         struct cfg80211_assoc_request req = {};
 150         int err;
 151
 152         ASSERT_WDEV_LOCK(wdev);
 153
 154         if (!wdev->conn)
 155                 return 0;
 156
 157         params = &wdev->conn->params;
 158
 159         switch (wdev->conn->state) {
 160         case CFG80211_CONN_SCANNING:
 161                 /* didn't find it during scan ... */
 162                 return -ENOENT;
 163         case CFG80211_CONN_SCAN_AGAIN:
 164                 return cfg80211_conn_scan(wdev);
 165         case CFG80211_CONN_AUTHENTICATE_NEXT:
 166                 if (WARN_ON(!rdev->ops->auth))
 167                         return -EOPNOTSUPP;
 168                 wdev->conn->state = CFG80211_CONN_AUTHENTICATING;
 169                 return cfg80211_mlme_auth(rdev, wdev->netdev,
 170                                           params->channel, params->auth_type,
 171                                           params->bssid,
 172                                           params->ssid, params->ssid_len,
 173                                           NULL, 0,
 174                                           params->key, params->key_len,
 175                                           params->key_idx, NULL, 0);
 176         case CFG80211_CONN_AUTH_FAILED_TIMEOUT:
 177                 *treason = NL80211_TIMEOUT_AUTH;
 178                 return -ENOTCONN;
 179         case CFG80211_CONN_ASSOCIATE_NEXT:
 180                 if (WARN_ON(!rdev->ops->assoc))
 181                         return -EOPNOTSUPP;
 182                 wdev->conn->state = CFG80211_CONN_ASSOCIATING;
 183                 if (wdev->conn->prev_bssid_valid)
 184                         req.prev_bssid = wdev->conn->prev_bssid;
 185                 req.ie = params->ie;
 186                 req.ie_len = params->ie_len;
 187                 req.use_mfp = params->mfp != NL80211_MFP_NO;
 188                 req.crypto = params->crypto;
 189                 req.flags = params->flags;
 190                 req.ht_capa = params->ht_capa;
 191                 req.ht_capa_mask = params->ht_capa_mask;
 192                 req.vht_capa = params->vht_capa;
 193                 req.vht_capa_mask = params->vht_capa_mask;
 194
 195                 err = cfg80211_mlme_assoc(rdev, wdev->netdev, params->channel,
 196                                           params->bssid, params->ssid,
 197                                           params->ssid_len, &req);
 198                 if (err)
 199                         cfg80211_mlme_deauth(rdev, wdev->netdev, params->bssid,
 200                                              NULL, 0,
 201                                              WLAN_REASON_DEAUTH_LEAVING,
 202                                              false);
 203                 return err;
 204         case CFG80211_CONN_ASSOC_FAILED_TIMEOUT:
 205                 *treason = NL80211_TIMEOUT_ASSOC;
 206                 /* fall through */
 207         case CFG80211_CONN_ASSOC_FAILED:
 208                 cfg80211_mlme_deauth(rdev, wdev->netdev, params->bssid,
 209                                      NULL, 0,
 210                                      WLAN_REASON_DEAUTH_LEAVING, false);
 211                 return -ENOTCONN;
 212         case CFG80211_CONN_DEAUTH:
 213                 cfg80211_mlme_deauth(rdev, wdev->netdev, params->bssid,
 214                                      NULL, 0,
 215                                      WLAN_REASON_DEAUTH_LEAVING, false);
 216                 /* fall through */
 217         case CFG80211_CONN_ABANDON:
 218                 /* free directly, disconnected event already sent */
 219                 cfg80211_sme_free(wdev);
 220                 return 0;
 221         default:
 222                 return 0;
 223         }
 224 }
 225
 226 void cfg80211_conn_work(struct work_struct *work)
 227 {
 228         struct cfg80211_registered_device *rdev =
 229                 container_of(work, struct cfg80211_registered_device, conn_work);
 230         struct wireless_dev *wdev;
 231         u8 bssid_buf[ETH_ALEN], *bssid = NULL;
 232         enum nl80211_timeout_reason treason;
 233
 234         rtnl_lock();
 235
 236         list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
 237                 if (!wdev->netdev)
 238                         continue;
 239
 240                 wdev_lock(wdev);
 241                 if (!netif_running(wdev->netdev)) {
 242                         wdev_unlock(wdev);
 243                         continue;
 244                 }
 245                 if (!wdev->conn ||
 246                     wdev->conn->state == CFG80211_CONN_CONNECTED) {
 247                         wdev_unlock(wdev);
 248                         continue;
 249                 }
 250                 if (wdev->conn->params.bssid) {
 251                         memcpy(bssid_buf, wdev->conn->params.bssid, ETH_ALEN);
 252                         bssid = bssid_buf;
 253                 }
 254                 treason = NL80211_TIMEOUT_UNSPECIFIED;
 255                 if (cfg80211_conn_do_work(wdev, &treason)) {
 256                         __cfg80211_connect_result(
 257                                         wdev->netdev, bssid,
 258                                         NULL, 0, NULL, 0, -1, false, NULL,
 259                                         treason);
 260                 }
 261                 wdev_unlock(wdev);
 262         }
 263
 264         rtnl_unlock();
 265 }
 266
 267 /* Returned bss is reference counted and must be cleaned up appropriately. */
 268 static struct cfg80211_bss *cfg80211_get_conn_bss(struct wireless_dev *wdev)
 269 {
 270         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 271         struct cfg80211_bss *bss;
 272
 273         ASSERT_WDEV_LOCK(wdev);
 274
 275         bss = cfg80211_get_bss(wdev->wiphy, wdev->conn->params.channel,
 276                                wdev->conn->params.bssid,
 277                                wdev->conn->params.ssid,
 278                                wdev->conn->params.ssid_len,
 279                                wdev->conn_bss_type,
 280                                IEEE80211_PRIVACY(wdev->conn->params.privacy));
 281         if (!bss)
 282                 return NULL;
 283
 284         memcpy(wdev->conn->bssid, bss->bssid, ETH_ALEN);
 285         wdev->conn->params.bssid = wdev->conn->bssid;
 286         wdev->conn->params.channel = bss->channel;
 287         wdev->conn->state = CFG80211_CONN_AUTHENTICATE_NEXT;
 288         schedule_work(&rdev->conn_work);
 289
 290         return bss;
 291 }
 292
 293 static void __cfg80211_sme_scan_done(struct net_device *dev)
 294 {
 295         struct wireless_dev *wdev = dev->ieee80211_ptr;
 296         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 297         struct cfg80211_bss *bss;
 298
 299         ASSERT_WDEV_LOCK(wdev);
 300
 301         if (!wdev->conn)
 302                 return;
 303
 304         if (wdev->conn->state != CFG80211_CONN_SCANNING &&
 305             wdev->conn->state != CFG80211_CONN_SCAN_AGAIN)
 306                 return;
 307
 308         bss = cfg80211_get_conn_bss(wdev);
 309         if (bss)
 310                 cfg80211_put_bss(&rdev->wiphy, bss);
 311         else
 312                 schedule_work(&rdev->conn_work);
 313 }
 314
 315 void cfg80211_sme_scan_done(struct net_device *dev)
 316 {
 317         struct wireless_dev *wdev = dev->ieee80211_ptr;
 318
 319         wdev_lock(wdev);
 320         __cfg80211_sme_scan_done(dev);
 321         wdev_unlock(wdev);
 322 }
 323
 324 void cfg80211_sme_rx_auth(struct wireless_dev *wdev, const u8 *buf, size_t len)
 325 {
 326         struct wiphy *wiphy = wdev->wiphy;
 327         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 328         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)buf;
 329         u16 status_code = le16_to_cpu(mgmt->u.auth.status_code);
 330
 331         ASSERT_WDEV_LOCK(wdev);
 332
 333         if (!wdev->conn || wdev->conn->state == CFG80211_CONN_CONNECTED)
 334                 return;
 335
 336         if (status_code == WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG &&
 337             wdev->conn->auto_auth &&
 338             wdev->conn->params.auth_type != NL80211_AUTHTYPE_NETWORK_EAP) {
 339                 /* select automatically between only open, shared, leap */
 340                 switch (wdev->conn->params.auth_type) {
 341                 case NL80211_AUTHTYPE_OPEN_SYSTEM:
 342                         if (wdev->connect_keys)
 343                                 wdev->conn->params.auth_type =
 344                                         NL80211_AUTHTYPE_SHARED_KEY;
 345                         else
 346                                 wdev->conn->params.auth_type =
 347                                         NL80211_AUTHTYPE_NETWORK_EAP;
 348                         break;
 349                 case NL80211_AUTHTYPE_SHARED_KEY:
 350                         wdev->conn->params.auth_type =
 351                                 NL80211_AUTHTYPE_NETWORK_EAP;
 352                         break;
 353                 default:
 354                         /* huh? */
 355                         wdev->conn->params.auth_type =
 356                                 NL80211_AUTHTYPE_OPEN_SYSTEM;
 357                         break;
 358                 }
 359                 wdev->conn->state = CFG80211_CONN_AUTHENTICATE_NEXT;
 360                 schedule_work(&rdev->conn_work);
 361         } else if (status_code != WLAN_STATUS_SUCCESS) {
 362                 __cfg80211_connect_result(wdev->netdev, mgmt->bssid,
 363                                           NULL, 0, NULL, 0,
 364                                           status_code, false, NULL,
 365                                           NL80211_TIMEOUT_UNSPECIFIED);
 366         } else if (wdev->conn->state == CFG80211_CONN_AUTHENTICATING) {
 367                 wdev->conn->state = CFG80211_CONN_ASSOCIATE_NEXT;
 368                 schedule_work(&rdev->conn_work);
 369         }
 370 }
 371
 372 bool cfg80211_sme_rx_assoc_resp(struct wireless_dev *wdev, u16 status)
 373 {
 374         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 375
 376         if (!wdev->conn)
 377                 return false;
 378
 379         if (status == WLAN_STATUS_SUCCESS) {
 380                 wdev->conn->state = CFG80211_CONN_CONNECTED;
 381                 return false;
 382         }
 383
 384         if (wdev->conn->prev_bssid_valid) {
 385                 /*
 386                  * Some stupid APs don't accept reassoc, so we
 387                  * need to fall back to trying regular assoc;
 388                  * return true so no event is sent to userspace.
 389                  */
 390                 wdev->conn->prev_bssid_valid = false;
 391                 wdev->conn->state = CFG80211_CONN_ASSOCIATE_NEXT;
 392                 schedule_work(&rdev->conn_work);
 393                 return true;
 394         }
 395
 396         wdev->conn->state = CFG80211_CONN_ASSOC_FAILED;
 397         schedule_work(&rdev->conn_work);
 398         return false;
 399 }
 400
 401 void cfg80211_sme_deauth(struct wireless_dev *wdev)
 402 {
 403         cfg80211_sme_free(wdev);
 404 }
 405
 406 void cfg80211_sme_auth_timeout(struct wireless_dev *wdev)
 407 {
 408         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 409
 410         if (!wdev->conn)
 411                 return;
 412
 413         wdev->conn->state = CFG80211_CONN_AUTH_FAILED_TIMEOUT;
 414         schedule_work(&rdev->conn_work);
 415 }
 416
 417 void cfg80211_sme_disassoc(struct wireless_dev *wdev)
 418 {
 419         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 420
 421         if (!wdev->conn)
 422                 return;
 423
 424         wdev->conn->state = CFG80211_CONN_DEAUTH;
 425         schedule_work(&rdev->conn_work);
 426 }
 427
 428 void cfg80211_sme_assoc_timeout(struct wireless_dev *wdev)
 429 {
 430         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 431
 432         if (!wdev->conn)
 433                 return;
 434
 435         wdev->conn->state = CFG80211_CONN_ASSOC_FAILED_TIMEOUT;
 436         schedule_work(&rdev->conn_work);
 437 }
 438
 439 void cfg80211_sme_abandon_assoc(struct wireless_dev *wdev)
 440 {
 441         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 442
 443         if (!wdev->conn)
 444                 return;
 445
 446         wdev->conn->state = CFG80211_CONN_ABANDON;
 447         schedule_work(&rdev->conn_work);
 448 }
 449
 450 static int cfg80211_sme_get_conn_ies(struct wireless_dev *wdev,
 451                                      const u8 *ies, size_t ies_len,
 452                                      const u8 **out_ies, size_t *out_ies_len)
 453 {
 454         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 455         u8 *buf;
 456         size_t offs;
 457
 458         if (!rdev->wiphy.extended_capabilities_len ||
 459             (ies && cfg80211_find_ie(WLAN_EID_EXT_CAPABILITY, ies, ies_len))) {
 460                 *out_ies = kmemdup(ies, ies_len, GFP_KERNEL);
 461                 if (!*out_ies)
 462                         return -ENOMEM;
 463                 *out_ies_len = ies_len;
 464                 return 0;
 465         }
 466
 467         buf = kmalloc(ies_len + rdev->wiphy.extended_capabilities_len + 2,
 468                       GFP_KERNEL);
 469         if (!buf)
 470                 return -ENOMEM;
 471
 472         if (ies_len) {
 473                 static const u8 before_extcapa[] = {
 474                         /* not listing IEs expected to be created by driver */
 475                         WLAN_EID_RSN,
 476                         WLAN_EID_QOS_CAPA,
 477                         WLAN_EID_RRM_ENABLED_CAPABILITIES,
 478                         WLAN_EID_MOBILITY_DOMAIN,
 479                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 480                         WLAN_EID_BSS_COEX_2040,
 481                 };
 482
 483                 offs = ieee80211_ie_split(ies, ies_len, before_extcapa,
 484                                           ARRAY_SIZE(before_extcapa), 0);
 485                 memcpy(buf, ies, offs);
 486                 /* leave a whole for extended capabilities IE */
 487                 memcpy(buf + offs + rdev->wiphy.extended_capabilities_len + 2,
 488                        ies + offs, ies_len - offs);
 489         } else {
 490                 offs = 0;
 491         }
 492
 493         /* place extended capabilities IE (with only driver capabilities) */
 494         buf[offs] = WLAN_EID_EXT_CAPABILITY;
 495         buf[offs + 1] = rdev->wiphy.extended_capabilities_len;
 496         memcpy(buf + offs + 2,
 497                rdev->wiphy.extended_capabilities,
 498                rdev->wiphy.extended_capabilities_len);
 499
 500         *out_ies = buf;
 501         *out_ies_len = ies_len + rdev->wiphy.extended_capabilities_len + 2;
 502
 503         return 0;
 504 }
 505
 506 static int cfg80211_sme_connect(struct wireless_dev *wdev,
 507                                 struct cfg80211_connect_params *connect,
 508                                 const u8 *prev_bssid)
 509 {
 510         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 511         struct cfg80211_bss *bss;
 512         int err;
 513
 514         if (!rdev->ops->auth || !rdev->ops->assoc)
 515                 return -EOPNOTSUPP;
 516
 517         if (wdev->current_bss) {
 518                 if (!prev_bssid)
 519                         return -EALREADY;
 520                 if (prev_bssid &&
 521                     !ether_addr_equal(prev_bssid, wdev->current_bss->pub.bssid))
 522                         return -ENOTCONN;
 523                 cfg80211_unhold_bss(wdev->current_bss);
 524                 cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
 525                 wdev->current_bss = NULL;
 526
 527                 cfg80211_sme_free(wdev);
 528         }
 529
 530         if (WARN_ON(wdev->conn))
 531                 return -EINPROGRESS;
 532
 533         wdev->conn = kzalloc(sizeof(*wdev->conn), GFP_KERNEL);
 534         if (!wdev->conn)
 535                 return -ENOMEM;
 536
 537         /*
 538          * Copy all parameters, and treat explicitly IEs, BSSID, SSID.
 539          */
 540         memcpy(&wdev->conn->params, connect, sizeof(*connect));
 541         if (connect->bssid) {
 542                 wdev->conn->params.bssid = wdev->conn->bssid;
 543                 memcpy(wdev->conn->bssid, connect->bssid, ETH_ALEN);
 544         }
 545
 546         if (cfg80211_sme_get_conn_ies(wdev, connect->ie, connect->ie_len,
 547                                       &wdev->conn->ie,
 548                                       &wdev->conn->params.ie_len)) {
 549                 kfree(wdev->conn);
 550                 wdev->conn = NULL;
 551                 return -ENOMEM;
 552         }
 553         wdev->conn->params.ie = wdev->conn->ie;
 554
 555         if (connect->auth_type == NL80211_AUTHTYPE_AUTOMATIC) {
 556                 wdev->conn->auto_auth = true;
 557                 /* start with open system ... should mostly work */
 558                 wdev->conn->params.auth_type =
 559                         NL80211_AUTHTYPE_OPEN_SYSTEM;
 560         } else {
 561                 wdev->conn->auto_auth = false;
 562         }
 563
 564         wdev->conn->params.ssid = wdev->ssid;
 565         wdev->conn->params.ssid_len = wdev->ssid_len;
 566
 567         /* see if we have the bss already */
 568         bss = cfg80211_get_conn_bss(wdev);
 569
 570         if (prev_bssid) {
 571                 memcpy(wdev->conn->prev_bssid, prev_bssid, ETH_ALEN);
 572                 wdev->conn->prev_bssid_valid = true;
 573         }
 574
 575         /* we're good if we have a matching bss struct */
 576         if (bss) {
 577                 enum nl80211_timeout_reason treason;
 578
 579                 err = cfg80211_conn_do_work(wdev, &treason);
 580                 cfg80211_put_bss(wdev->wiphy, bss);
 581         } else {
 582                 /* otherwise we'll need to scan for the AP first */
 583                 err = cfg80211_conn_scan(wdev);
 584
 585                 /*
 586                  * If we can't scan right now, then we need to scan again
 587                  * after the current scan finished, since the parameters
 588                  * changed (unless we find a good AP anyway).
 589                  */
 590                 if (err == -EBUSY) {
 591                         err = 0;
 592                         wdev->conn->state = CFG80211_CONN_SCAN_AGAIN;
 593                 }
 594         }
 595
 596         if (err)
 597                 cfg80211_sme_free(wdev);
 598
 599         return err;
 600 }
 601
 602 static int cfg80211_sme_disconnect(struct wireless_dev *wdev, u16 reason)
 603 {
 604         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 605         int err;
 606
 607         if (!wdev->conn)
 608                 return 0;
 609
 610         if (!rdev->ops->deauth)
 611                 return -EOPNOTSUPP;
 612
 613         if (wdev->conn->state == CFG80211_CONN_SCANNING ||
 614             wdev->conn->state == CFG80211_CONN_SCAN_AGAIN) {
 615                 err = 0;
 616                 goto out;
 617         }
 618
 619         /* wdev->conn->params.bssid must be set if > SCANNING */
 620         err = cfg80211_mlme_deauth(rdev, wdev->netdev,
 621                                    wdev->conn->params.bssid,
 622                                    NULL, 0, reason, false);
 623  out:
 624         cfg80211_sme_free(wdev);
 625         return err;
 626 }
 627
 628 /*
 629  * code shared for in-device and software SME
 630  */
 631
 632 static bool cfg80211_is_all_idle(void)
 633 {
 634         struct cfg80211_registered_device *rdev;
 635         struct wireless_dev *wdev;
 636         bool is_all_idle = true;
 637
 638         /*
 639          * All devices must be idle as otherwise if you are actively
 640          * scanning some new beacon hints could be learned and would
 641          * count as new regulatory hints.
 642          */
 643         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
 644                 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
 645                         wdev_lock(wdev);
 646                         if (wdev->conn || wdev->current_bss)
 647                                 is_all_idle = false;
 648                         wdev_unlock(wdev);
 649                 }
 650         }
 651
 652         return is_all_idle;
 653 }
 654
 655 static void disconnect_work(struct work_struct *work)
 656 {
 657         rtnl_lock();
 658         if (cfg80211_is_all_idle())
 659                 regulatory_hint_disconnect();
 660         rtnl_unlock();
 661 }
 662
 663 static DECLARE_WORK(cfg80211_disconnect_work, disconnect_work);
 664
 665
 666 /*
 667  * API calls for drivers implementing connect/disconnect and
 668  * SME event handling
 669  */
 670
 671 /* This method must consume bss one way or another */
 672 void __cfg80211_connect_result(struct net_device *dev, const u8 *bssid,
 673                                const u8 *req_ie, size_t req_ie_len,
 674                                const u8 *resp_ie, size_t resp_ie_len,
 675                                int status, bool wextev,
 676                                struct cfg80211_bss *bss,
 677                                enum nl80211_timeout_reason timeout_reason)
 678 {
 679         struct wireless_dev *wdev = dev->ieee80211_ptr;
 680         const u8 *country_ie;
 681 #ifdef CONFIG_CFG80211_WEXT
 682         union iwreq_data wrqu;
 683 #endif
 684
 685         ASSERT_WDEV_LOCK(wdev);
 686
 687         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION &&
 688                     wdev->iftype != NL80211_IFTYPE_P2P_CLIENT)) {
 689                 cfg80211_put_bss(wdev->wiphy, bss);
 690                 return;
 691         }
 692
 693         nl80211_send_connect_result(wiphy_to_rdev(wdev->wiphy), dev,
 694                                     bssid, req_ie, req_ie_len,
 695                                     resp_ie, resp_ie_len,
 696                                     status, timeout_reason, GFP_KERNEL);
 697
 698 #ifdef CONFIG_CFG80211_WEXT
 699         if (wextev) {
 700                 if (req_ie && status == WLAN_STATUS_SUCCESS) {
 701                         memset(&wrqu, 0, sizeof(wrqu));
 702                         wrqu.data.length = req_ie_len;
 703                         wireless_send_event(dev, IWEVASSOCREQIE, &wrqu, req_ie);
 704                 }
 705
 706                 if (resp_ie && status == WLAN_STATUS_SUCCESS) {
 707                         memset(&wrqu, 0, sizeof(wrqu));
 708                         wrqu.data.length = resp_ie_len;
 709                         wireless_send_event(dev, IWEVASSOCRESPIE, &wrqu, resp_ie);
 710                 }
 711
 712                 memset(&wrqu, 0, sizeof(wrqu));
 713                 wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 714                 if (bssid && status == WLAN_STATUS_SUCCESS) {
 715                         memcpy(wrqu.ap_addr.sa_data, bssid, ETH_ALEN);
 716                         memcpy(wdev->wext.prev_bssid, bssid, ETH_ALEN);
 717                         wdev->wext.prev_bssid_valid = true;
 718                 }
 719                 wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL);
 720         }
 721 #endif
 722
 723         if (!bss && (status == WLAN_STATUS_SUCCESS)) {
 724                 WARN_ON_ONCE(!wiphy_to_rdev(wdev->wiphy)->ops->connect);
 725                 bss = cfg80211_get_bss(wdev->wiphy, NULL, bssid,
 726                                        wdev->ssid, wdev->ssid_len,
 727                                        wdev->conn_bss_type,
 728                                        IEEE80211_PRIVACY_ANY);
 729                 if (bss)
 730                         cfg80211_hold_bss(bss_from_pub(bss));
 731         }
 732
 733         if (wdev->current_bss) {
 734                 cfg80211_unhold_bss(wdev->current_bss);
 735                 cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
 736                 wdev->current_bss = NULL;
 737         }
 738
 739         if (status != WLAN_STATUS_SUCCESS) {
 740                 kzfree(wdev->connect_keys);
 741                 wdev->connect_keys = NULL;
 742                 wdev->ssid_len = 0;
 743                 wdev->conn_owner_nlportid = 0;
 744                 if (bss) {
 745                         cfg80211_unhold_bss(bss_from_pub(bss));
 746                         cfg80211_put_bss(wdev->wiphy, bss);
 747                 }
 748                 cfg80211_sme_free(wdev);
 749                 return;
 750         }
 751
 752         if (WARN_ON(!bss))
 753                 return;
 754
 755         wdev->current_bss = bss_from_pub(bss);
 756
 757         if (!(wdev->wiphy->flags & WIPHY_FLAG_HAS_STATIC_WEP))
 758                 cfg80211_upload_connect_keys(wdev);
 759
 760         rcu_read_lock();
 761         country_ie = ieee80211_bss_get_ie(bss, WLAN_EID_COUNTRY);
 762         if (!country_ie) {
 763                 rcu_read_unlock();
 764                 return;
 765         }
 766
 767         country_ie = kmemdup(country_ie, 2 + country_ie[1], GFP_ATOMIC);
 768         rcu_read_unlock();
 769
 770         if (!country_ie)
 771                 return;
 772
 773         /*
 774          * ieee80211_bss_get_ie() ensures we can access:
 775          * - country_ie + 2, the start of the country ie data, and
 776          * - and country_ie[1] which is the IE length
 777          */
 778         regulatory_hint_country_ie(wdev->wiphy, bss->channel->band,
 779                                    country_ie + 2, country_ie[1]);
 780         kfree(country_ie);
 781 }
 782
 783 /* Consumes bss object one way or another */
 784 void cfg80211_connect_bss(struct net_device *dev, const u8 *bssid,
 785                           struct cfg80211_bss *bss, const u8 *req_ie,
 786                           size_t req_ie_len, const u8 *resp_ie,
 787                           size_t resp_ie_len, int status, gfp_t gfp,
 788                           enum nl80211_timeout_reason timeout_reason)
 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
 795         if (bss) {
 796                 /* Make sure the bss entry provided by the driver is valid. */
 797                 struct cfg80211_internal_bss *ibss = bss_from_pub(bss);
 798
 799                 if (WARN_ON(list_empty(&ibss->list))) {
 800                         cfg80211_put_bss(wdev->wiphy, bss);
 801                         return;
 802                 }
 803         }
 804
 805         ev = kzalloc(sizeof(*ev) + req_ie_len + resp_ie_len, gfp);
 806         if (!ev) {
 807                 cfg80211_put_bss(wdev->wiphy, bss);
 808                 return;
 809         }
 810
 811         ev->type = EVENT_CONNECT_RESULT;
 812         if (bssid)
 813                 memcpy(ev->cr.bssid, bssid, ETH_ALEN);
 814         if (req_ie_len) {
 815                 ev->cr.req_ie = ((u8 *)ev) + sizeof(*ev);
 816                 ev->cr.req_ie_len = req_ie_len;
 817                 memcpy((void *)ev->cr.req_ie, req_ie, req_ie_len);
 818         }
 819         if (resp_ie_len) {
 820                 ev->cr.resp_ie = ((u8 *)ev) + sizeof(*ev) + req_ie_len;
 821                 ev->cr.resp_ie_len = resp_ie_len;
 822                 memcpy((void *)ev->cr.resp_ie, resp_ie, resp_ie_len);
 823         }
 824         if (bss)
 825                 cfg80211_hold_bss(bss_from_pub(bss));
 826         ev->cr.bss = bss;
 827         ev->cr.status = status;
 828         ev->cr.timeout_reason = timeout_reason;
 829
 830         spin_lock_irqsave(&wdev->event_lock, flags);
 831         list_add_tail(&ev->list, &wdev->event_list);
 832         spin_unlock_irqrestore(&wdev->event_lock, flags);
 833         queue_work(cfg80211_wq, &rdev->event_work);
 834 }
 835 EXPORT_SYMBOL(cfg80211_connect_bss);
 836
 837 /* Consumes bss object one way or another */
 838 void __cfg80211_roamed(struct wireless_dev *wdev,
 839                        struct cfg80211_bss *bss,
 840                        const u8 *req_ie, size_t req_ie_len,
 841                        const u8 *resp_ie, size_t resp_ie_len)
 842 {
 843 #ifdef CONFIG_CFG80211_WEXT
 844         union iwreq_data wrqu;
 845 #endif
 846         ASSERT_WDEV_LOCK(wdev);
 847
 848         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION &&
 849                     wdev->iftype != NL80211_IFTYPE_P2P_CLIENT))
 850                 goto out;
 851
 852         if (WARN_ON(!wdev->current_bss))
 853                 goto out;
 854
 855         cfg80211_unhold_bss(wdev->current_bss);
 856         cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
 857         wdev->current_bss = NULL;
 858
 859         cfg80211_hold_bss(bss_from_pub(bss));
 860         wdev->current_bss = bss_from_pub(bss);
 861
 862         nl80211_send_roamed(wiphy_to_rdev(wdev->wiphy),
 863                             wdev->netdev, bss->bssid,
 864                             req_ie, req_ie_len, resp_ie, resp_ie_len,
 865                             GFP_KERNEL);
 866
 867 #ifdef CONFIG_CFG80211_WEXT
 868         if (req_ie) {
 869                 memset(&wrqu, 0, sizeof(wrqu));
 870                 wrqu.data.length = req_ie_len;
 871                 wireless_send_event(wdev->netdev, IWEVASSOCREQIE,
 872                                     &wrqu, req_ie);
 873         }
 874
 875         if (resp_ie) {
 876                 memset(&wrqu, 0, sizeof(wrqu));
 877                 wrqu.data.length = resp_ie_len;
 878                 wireless_send_event(wdev->netdev, IWEVASSOCRESPIE,
 879                                     &wrqu, resp_ie);
 880         }
 881
 882         memset(&wrqu, 0, sizeof(wrqu));
 883         wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 884         memcpy(wrqu.ap_addr.sa_data, bss->bssid, ETH_ALEN);
 885         memcpy(wdev->wext.prev_bssid, bss->bssid, ETH_ALEN);
 886         wdev->wext.prev_bssid_valid = true;
 887         wireless_send_event(wdev->netdev, SIOCGIWAP, &wrqu, NULL);
 888 #endif
 889
 890         return;
 891 out:
 892         cfg80211_put_bss(wdev->wiphy, bss);
 893 }
 894
 895 void cfg80211_roamed(struct net_device *dev,
 896                      struct ieee80211_channel *channel,
 897                      const u8 *bssid,
 898                      const u8 *req_ie, size_t req_ie_len,
 899                      const u8 *resp_ie, size_t resp_ie_len, gfp_t gfp)
 900 {
 901         struct wireless_dev *wdev = dev->ieee80211_ptr;
 902         struct cfg80211_bss *bss;
 903
 904         bss = cfg80211_get_bss(wdev->wiphy, channel, bssid, wdev->ssid,
 905                                wdev->ssid_len,
 906                                wdev->conn_bss_type, IEEE80211_PRIVACY_ANY);
 907         if (WARN_ON(!bss))
 908                 return;
 909
 910         cfg80211_roamed_bss(dev, bss, req_ie, req_ie_len, resp_ie,
 911                             resp_ie_len, gfp);
 912 }
 913 EXPORT_SYMBOL(cfg80211_roamed);
 914
 915 /* Consumes bss object one way or another */
 916 void cfg80211_roamed_bss(struct net_device *dev,
 917                          struct cfg80211_bss *bss, const u8 *req_ie,
 918                          size_t req_ie_len, const u8 *resp_ie,
 919                          size_t resp_ie_len, gfp_t gfp)
 920 {
 921         struct wireless_dev *wdev = dev->ieee80211_ptr;
 922         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 923         struct cfg80211_event *ev;
 924         unsigned long flags;
 925
 926         if (WARN_ON(!bss))
 927                 return;
 928
 929         ev = kzalloc(sizeof(*ev) + req_ie_len + resp_ie_len, gfp);
 930         if (!ev) {
 931                 cfg80211_put_bss(wdev->wiphy, bss);
 932                 return;
 933         }
 934
 935         ev->type = EVENT_ROAMED;
 936         ev->rm.req_ie = ((u8 *)ev) + sizeof(*ev);
 937         ev->rm.req_ie_len = req_ie_len;
 938         memcpy((void *)ev->rm.req_ie, req_ie, req_ie_len);
 939         ev->rm.resp_ie = ((u8 *)ev) + sizeof(*ev) + req_ie_len;
 940         ev->rm.resp_ie_len = resp_ie_len;
 941         memcpy((void *)ev->rm.resp_ie, resp_ie, resp_ie_len);
 942         ev->rm.bss = bss;
 943
 944         spin_lock_irqsave(&wdev->event_lock, flags);
 945         list_add_tail(&ev->list, &wdev->event_list);
 946         spin_unlock_irqrestore(&wdev->event_lock, flags);
 947         queue_work(cfg80211_wq, &rdev->event_work);
 948 }
 949 EXPORT_SYMBOL(cfg80211_roamed_bss);
 950
 951 void __cfg80211_disconnected(struct net_device *dev, const u8 *ie,
 952                              size_t ie_len, u16 reason, bool from_ap)
 953 {
 954         struct wireless_dev *wdev = dev->ieee80211_ptr;
 955         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 956         int i;
 957 #ifdef CONFIG_CFG80211_WEXT
 958         union iwreq_data wrqu;
 959 #endif
 960
 961         ASSERT_WDEV_LOCK(wdev);
 962
 963         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION &&
 964                     wdev->iftype != NL80211_IFTYPE_P2P_CLIENT))
 965                 return;
 966
 967         if (wdev->current_bss) {
 968                 cfg80211_unhold_bss(wdev->current_bss);
 969                 cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
 970         }
 971
 972         wdev->current_bss = NULL;
 973         wdev->ssid_len = 0;
 974         wdev->conn_owner_nlportid = 0;
 975
 976         nl80211_send_disconnected(rdev, dev, reason, ie, ie_len, from_ap);
 977
 978         /* stop critical protocol if supported */
 979         if (rdev->ops->crit_proto_stop && rdev->crit_proto_nlportid) {
 980                 rdev->crit_proto_nlportid = 0;
 981                 rdev_crit_proto_stop(rdev, wdev);
 982         }
 983
 984         /*
 985          * Delete all the keys ... pairwise keys can't really
 986          * exist any more anyway, but default keys might.
 987          */
 988         if (rdev->ops->del_key)
 989                 for (i = 0; i < 6; i++)
 990                         rdev_del_key(rdev, dev, i, false, NULL);
 991
 992         rdev_set_qos_map(rdev, dev, NULL);
 993
 994 #ifdef CONFIG_CFG80211_WEXT
 995         memset(&wrqu, 0, sizeof(wrqu));
 996         wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 997         wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL);
 998         wdev->wext.connect.ssid_len = 0;
 999 #endif
1000
1001         schedule_work(&cfg80211_disconnect_work);
1002 }
1003
1004 void cfg80211_disconnected(struct net_device *dev, u16 reason,
1005                            const u8 *ie, size_t ie_len,
1006                            bool locally_generated, gfp_t gfp)
1007 {
1008         struct wireless_dev *wdev = dev->ieee80211_ptr;
1009         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
1010         struct cfg80211_event *ev;
1011         unsigned long flags;
1012
1013         ev = kzalloc(sizeof(*ev) + ie_len, gfp);
1014         if (!ev)
1015                 return;
1016
1017         ev->type = EVENT_DISCONNECTED;
1018         ev->dc.ie = ((u8 *)ev) + sizeof(*ev);
1019         ev->dc.ie_len = ie_len;
1020         memcpy((void *)ev->dc.ie, ie, ie_len);
1021         ev->dc.reason = reason;
1022         ev->dc.locally_generated = locally_generated;
1023
1024         spin_lock_irqsave(&wdev->event_lock, flags);
1025         list_add_tail(&ev->list, &wdev->event_list);
1026         spin_unlock_irqrestore(&wdev->event_lock, flags);
1027         queue_work(cfg80211_wq, &rdev->event_work);
1028 }
1029 EXPORT_SYMBOL(cfg80211_disconnected);
1030
1031 /*
1032  * API calls for nl80211/wext compatibility code
1033  */
1034 int cfg80211_connect(struct cfg80211_registered_device *rdev,
1035                      struct net_device *dev,
1036                      struct cfg80211_connect_params *connect,
1037                      struct cfg80211_cached_keys *connkeys,
1038                      const u8 *prev_bssid)
1039 {
1040         struct wireless_dev *wdev = dev->ieee80211_ptr;
1041         int err;
1042
1043         ASSERT_WDEV_LOCK(wdev);
1044
1045         if (WARN_ON(wdev->connect_keys)) {
1046                 kzfree(wdev->connect_keys);
1047                 wdev->connect_keys = NULL;
1048         }
1049
1050         cfg80211_oper_and_ht_capa(&connect->ht_capa_mask,
1051                                   rdev->wiphy.ht_capa_mod_mask);
1052
1053         if (connkeys && connkeys->def >= 0) {
1054                 int idx;
1055                 u32 cipher;
1056
1057                 idx = connkeys->def;
1058                 cipher = connkeys->params[idx].cipher;
1059                 /* If given a WEP key we may need it for shared key auth */
1060                 if (cipher == WLAN_CIPHER_SUITE_WEP40 ||
1061                     cipher == WLAN_CIPHER_SUITE_WEP104) {
1062                         connect->key_idx = idx;
1063                         connect->key = connkeys->params[idx].key;
1064                         connect->key_len = connkeys->params[idx].key_len;
1065
1066                         /*
1067                          * If ciphers are not set (e.g. when going through
1068                          * iwconfig), we have to set them appropriately here.
1069                          */
1070                         if (connect->crypto.cipher_group == 0)
1071                                 connect->crypto.cipher_group = cipher;
1072
1073                         if (connect->crypto.n_ciphers_pairwise == 0) {
1074                                 connect->crypto.n_ciphers_pairwise = 1;
1075                                 connect->crypto.ciphers_pairwise[0] = cipher;
1076                         }
1077                 }
1078
1079                 connect->crypto.wep_keys = connkeys->params;
1080                 connect->crypto.wep_tx_key = connkeys->def;
1081         } else {
1082                 if (WARN_ON(connkeys))
1083                         return -EINVAL;
1084         }
1085
1086         wdev->connect_keys = connkeys;
1087         memcpy(wdev->ssid, connect->ssid, connect->ssid_len);
1088         wdev->ssid_len = connect->ssid_len;
1089
1090         wdev->conn_bss_type = connect->pbss ? IEEE80211_BSS_TYPE_PBSS :
1091                                               IEEE80211_BSS_TYPE_ESS;
1092
1093         if (!rdev->ops->connect)
1094                 err = cfg80211_sme_connect(wdev, connect, prev_bssid);
1095         else
1096                 err = rdev_connect(rdev, dev, connect);
1097
1098         if (err) {
1099                 wdev->connect_keys = NULL;
1100                 wdev->ssid_len = 0;
1101                 return err;
1102         }
1103
1104         return 0;
1105 }
1106
1107 int cfg80211_disconnect(struct cfg80211_registered_device *rdev,
1108                         struct net_device *dev, u16 reason, bool wextev)
1109 {
1110         struct wireless_dev *wdev = dev->ieee80211_ptr;
1111         int err = 0;
1112
1113         ASSERT_WDEV_LOCK(wdev);
1114
1115         kzfree(wdev->connect_keys);
1116         wdev->connect_keys = NULL;
1117
1118         wdev->conn_owner_nlportid = 0;
1119
1120         if (wdev->conn)
1121                 err = cfg80211_sme_disconnect(wdev, reason);
1122         else if (!rdev->ops->disconnect)
1123                 cfg80211_mlme_down(rdev, dev);
1124         else if (wdev->ssid_len)
1125                 err = rdev_disconnect(rdev, dev, reason);
1126
1127         return err;
1128 }
1129
1130 /*
1131  * Used to clean up after the connection / connection attempt owner socket
1132  * disconnects
1133  */
1134 void cfg80211_autodisconnect_wk(struct work_struct *work)
1135 {
1136         struct wireless_dev *wdev =
1137                 container_of(work, struct wireless_dev, disconnect_wk);
1138         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
1139
1140         wdev_lock(wdev);
1141
1142         if (wdev->conn_owner_nlportid) {
1143                 /*
1144                  * Use disconnect_bssid if still connecting and ops->disconnect
1145                  * not implemented.  Otherwise we can use cfg80211_disconnect.
1146                  */
1147                 if (rdev->ops->disconnect || wdev->current_bss)
1148                         cfg80211_disconnect(rdev, wdev->netdev,
1149                                             WLAN_REASON_DEAUTH_LEAVING, true);
1150                 else
1151                         cfg80211_mlme_deauth(rdev, wdev->netdev,
1152                                              wdev->disconnect_bssid, NULL, 0,
1153                                              WLAN_REASON_DEAUTH_LEAVING, false);
1154         }
1155
1156         wdev_unlock(wdev);
1157 }