net/wireless/sme.c

   1 /*
   2  * SME code for cfg80211's connect emulation.
   3  *
   4  * Copyright 2009       Johannes Berg <johannes@sipsolutions.net>
   5  * Copyright (C) 2009   Intel Corporation. All rights reserved.
   6  */
   7
   8 #include <linux/etherdevice.h>
   9 #include <linux/if_arp.h>
  10 #include <linux/slab.h>
  11 #include <linux/workqueue.h>
  12 #include <linux/wireless.h>
  13 #include <linux/export.h>
  14 #include <net/iw_handler.h>
  15 #include <net/cfg80211.h>
  16 #include <net/rtnetlink.h>
  17 #include "nl80211.h"
  18 #include "reg.h"
  19 #include "rdev-ops.h"
  20
  21 struct cfg80211_conn {
  22         struct cfg80211_connect_params params;
  23         /* these are sub-states of the _CONNECTING sme_state */
  24         enum {
  25                 CFG80211_CONN_IDLE,
  26                 CFG80211_CONN_SCANNING,
  27                 CFG80211_CONN_SCAN_AGAIN,
  28                 CFG80211_CONN_AUTHENTICATE_NEXT,
  29                 CFG80211_CONN_AUTHENTICATING,
  30                 CFG80211_CONN_ASSOCIATE_NEXT,
  31                 CFG80211_CONN_ASSOCIATING,
  32                 CFG80211_CONN_DEAUTH_ASSOC_FAIL,
  33         } state;
  34         u8 bssid[ETH_ALEN], prev_bssid[ETH_ALEN];
  35         u8 *ie;
  36         size_t ie_len;
  37         bool auto_auth, prev_bssid_valid;
  38 };
  39
  40 static bool cfg80211_is_all_idle(void)
  41 {
  42         struct cfg80211_registered_device *rdev;
  43         struct wireless_dev *wdev;
  44         bool is_all_idle = true;
  45
  46         mutex_lock(&cfg80211_mutex);
  47
  48         /*
  49          * All devices must be idle as otherwise if you are actively
  50          * scanning some new beacon hints could be learned and would
  51          * count as new regulatory hints.
  52          */
  53         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
  54                 cfg80211_lock_rdev(rdev);
  55                 list_for_each_entry(wdev, &rdev->wdev_list, list) {
  56                         wdev_lock(wdev);
  57                         if (wdev->sme_state != CFG80211_SME_IDLE)
  58                                 is_all_idle = false;
  59                         wdev_unlock(wdev);
  60                 }
  61                 cfg80211_unlock_rdev(rdev);
  62         }
  63
  64         mutex_unlock(&cfg80211_mutex);
  65
  66         return is_all_idle;
  67 }
  68
  69 static void disconnect_work(struct work_struct *work)
  70 {
  71         if (!cfg80211_is_all_idle())
  72                 return;
  73
  74         regulatory_hint_disconnect();
  75 }
  76
  77 static DECLARE_WORK(cfg80211_disconnect_work, disconnect_work);
  78
  79 static int cfg80211_conn_scan(struct wireless_dev *wdev)
  80 {
  81         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
  82         struct cfg80211_scan_request *request;
  83         int n_channels, err;
  84
  85         ASSERT_RTNL();
  86         ASSERT_RDEV_LOCK(rdev);
  87         ASSERT_WDEV_LOCK(wdev);
  88         lockdep_assert_held(&rdev->sched_scan_mtx);
  89
  90         if (rdev->scan_req)
  91                 return -EBUSY;
  92
  93         if (wdev->conn->params.channel) {
  94                 n_channels = 1;
  95         } else {
  96                 enum ieee80211_band band;
  97                 n_channels = 0;
  98
  99                 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 100                         if (!wdev->wiphy->bands[band])
 101                                 continue;
 102                         n_channels += wdev->wiphy->bands[band]->n_channels;
 103                 }
 104         }
 105         request = kzalloc(sizeof(*request) + sizeof(request->ssids[0]) +
 106                           sizeof(request->channels[0]) * n_channels,
 107                           GFP_KERNEL);
 108         if (!request)
 109                 return -ENOMEM;
 110
 111         if (wdev->conn->params.channel)
 112                 request->channels[0] = wdev->conn->params.channel;
 113         else {
 114                 int i = 0, j;
 115                 enum ieee80211_band band;
 116                 struct ieee80211_supported_band *bands;
 117                 struct ieee80211_channel *channel;
 118
 119                 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 120                         bands = wdev->wiphy->bands[band];
 121                         if (!bands)
 122                                 continue;
 123                         for (j = 0; j < bands->n_channels; j++) {
 124                                 channel = &bands->channels[j];
 125                                 if (channel->flags & IEEE80211_CHAN_DISABLED)
 126                                         continue;
 127                                 request->channels[i++] = channel;
 128                         }
 129                         request->rates[band] = (1 << bands->n_bitrates) - 1;
 130                 }
 131                 n_channels = i;
 132         }
 133         request->n_channels = n_channels;
 134         request->ssids = (void *)&request->channels[n_channels];
 135         request->n_ssids = 1;
 136
 137         memcpy(request->ssids[0].ssid, wdev->conn->params.ssid,
 138                 wdev->conn->params.ssid_len);
 139         request->ssids[0].ssid_len = wdev->conn->params.ssid_len;
 140
 141         request->wdev = wdev;
 142         request->wiphy = &rdev->wiphy;
 143         request->scan_start = jiffies;
 144
 145         rdev->scan_req = request;
 146
 147         err = rdev_scan(rdev, request);
 148         if (!err) {
 149                 wdev->conn->state = CFG80211_CONN_SCANNING;
 150                 nl80211_send_scan_start(rdev, wdev);
 151                 dev_hold(wdev->netdev);
 152         } else {
 153                 rdev->scan_req = NULL;
 154                 kfree(request);
 155         }
 156         return err;
 157 }
 158
 159 static int cfg80211_conn_do_work(struct wireless_dev *wdev)
 160 {
 161         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 162         struct cfg80211_connect_params *params;
 163         const u8 *prev_bssid = NULL;
 164         int err;
 165
 166         ASSERT_WDEV_LOCK(wdev);
 167
 168         if (!wdev->conn)
 169                 return 0;
 170
 171         params = &wdev->conn->params;
 172
 173         switch (wdev->conn->state) {
 174         case CFG80211_CONN_SCAN_AGAIN:
 175                 return cfg80211_conn_scan(wdev);
 176         case CFG80211_CONN_AUTHENTICATE_NEXT:
 177                 BUG_ON(!rdev->ops->auth);
 178                 wdev->conn->state = CFG80211_CONN_AUTHENTICATING;
 179                 return __cfg80211_mlme_auth(rdev, wdev->netdev,
 180                                             params->channel, params->auth_type,
 181                                             params->bssid,
 182                                             params->ssid, params->ssid_len,
 183                                             NULL, 0,
 184                                             params->key, params->key_len,
 185                                             params->key_idx, NULL, 0);
 186         case CFG80211_CONN_ASSOCIATE_NEXT:
 187                 BUG_ON(!rdev->ops->assoc);
 188                 wdev->conn->state = CFG80211_CONN_ASSOCIATING;
 189                 if (wdev->conn->prev_bssid_valid)
 190                         prev_bssid = wdev->conn->prev_bssid;
 191                 err = __cfg80211_mlme_assoc(rdev, wdev->netdev,
 192                                             params->channel, params->bssid,
 193                                             prev_bssid,
 194                                             params->ssid, params->ssid_len,
 195                                             params->ie, params->ie_len,
 196                                             params->mfp != NL80211_MFP_NO,
 197                                             &params->crypto,
 198                                             params->flags, &params->ht_capa,
 199                                             &params->ht_capa_mask);
 200                 if (err)
 201                         __cfg80211_mlme_deauth(rdev, wdev->netdev, params->bssid,
 202                                                NULL, 0,
 203                                                WLAN_REASON_DEAUTH_LEAVING,
 204                                                false);
 205                 return err;
 206         case CFG80211_CONN_DEAUTH_ASSOC_FAIL:
 207                 __cfg80211_mlme_deauth(rdev, wdev->netdev, params->bssid,
 208                                        NULL, 0,
 209                                        WLAN_REASON_DEAUTH_LEAVING, false);
 210                 /* return an error so that we call __cfg80211_connect_result() */
 211                 return -EINVAL;
 212         default:
 213                 return 0;
 214         }
 215 }
 216
 217 void cfg80211_conn_work(struct work_struct *work)
 218 {
 219         struct cfg80211_registered_device *rdev =
 220                 container_of(work, struct cfg80211_registered_device, conn_work);
 221         struct wireless_dev *wdev;
 222         u8 bssid_buf[ETH_ALEN], *bssid = NULL;
 223
 224         rtnl_lock();
 225         cfg80211_lock_rdev(rdev);
 226         mutex_lock(&rdev->devlist_mtx);
 227
 228         list_for_each_entry(wdev, &rdev->wdev_list, list) {
 229                 wdev_lock(wdev);
 230                 if (!netif_running(wdev->netdev)) {
 231                         wdev_unlock(wdev);
 232                         continue;
 233                 }
 234                 if (wdev->sme_state != CFG80211_SME_CONNECTING) {
 235                         wdev_unlock(wdev);
 236                         continue;
 237                 }
 238                 if (wdev->conn->params.bssid) {
 239                         memcpy(bssid_buf, wdev->conn->params.bssid, ETH_ALEN);
 240                         bssid = bssid_buf;
 241                 }
 242                 if (cfg80211_conn_do_work(wdev))
 243                         __cfg80211_connect_result(
 244                                         wdev->netdev, bssid,
 245                                         NULL, 0, NULL, 0,
 246                                         WLAN_STATUS_UNSPECIFIED_FAILURE,
 247                                         false, NULL);
 248                 wdev_unlock(wdev);
 249         }
 250
 251         mutex_unlock(&rdev->devlist_mtx);
 252         cfg80211_unlock_rdev(rdev);
 253         rtnl_unlock();
 254 }
 255
 256 static struct cfg80211_bss *cfg80211_get_conn_bss(struct wireless_dev *wdev)
 257 {
 258         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 259         struct cfg80211_bss *bss;
 260         u16 capa = WLAN_CAPABILITY_ESS;
 261
 262         ASSERT_WDEV_LOCK(wdev);
 263
 264         if (wdev->conn->params.privacy)
 265                 capa |= WLAN_CAPABILITY_PRIVACY;
 266
 267         bss = cfg80211_get_bss(wdev->wiphy, wdev->conn->params.channel,
 268                                wdev->conn->params.bssid,
 269                                wdev->conn->params.ssid,
 270                                wdev->conn->params.ssid_len,
 271                                WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_PRIVACY,
 272                                capa);
 273         if (!bss)
 274                 return NULL;
 275
 276         memcpy(wdev->conn->bssid, bss->bssid, ETH_ALEN);
 277         wdev->conn->params.bssid = wdev->conn->bssid;
 278         wdev->conn->params.channel = bss->channel;
 279         wdev->conn->state = CFG80211_CONN_AUTHENTICATE_NEXT;
 280         schedule_work(&rdev->conn_work);
 281
 282         return bss;
 283 }
 284
 285 static void __cfg80211_sme_scan_done(struct net_device *dev)
 286 {
 287         struct wireless_dev *wdev = dev->ieee80211_ptr;
 288         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 289         struct cfg80211_bss *bss;
 290
 291         ASSERT_WDEV_LOCK(wdev);
 292
 293         if (wdev->sme_state != CFG80211_SME_CONNECTING)
 294                 return;
 295
 296         if (!wdev->conn)
 297                 return;
 298
 299         if (wdev->conn->state != CFG80211_CONN_SCANNING &&
 300             wdev->conn->state != CFG80211_CONN_SCAN_AGAIN)
 301                 return;
 302
 303         bss = cfg80211_get_conn_bss(wdev);
 304         if (bss) {
 305                 cfg80211_put_bss(&rdev->wiphy, bss);
 306         } else {
 307                 /* not found */
 308                 if (wdev->conn->state == CFG80211_CONN_SCAN_AGAIN)
 309                         schedule_work(&rdev->conn_work);
 310                 else
 311                         __cfg80211_connect_result(
 312                                         wdev->netdev,
 313                                         wdev->conn->params.bssid,
 314                                         NULL, 0, NULL, 0,
 315                                         WLAN_STATUS_UNSPECIFIED_FAILURE,
 316                                         false, NULL);
 317         }
 318 }
 319
 320 void cfg80211_sme_scan_done(struct net_device *dev)
 321 {
 322         struct wireless_dev *wdev = dev->ieee80211_ptr;
 323
 324         wdev_lock(wdev);
 325         __cfg80211_sme_scan_done(dev);
 326         wdev_unlock(wdev);
 327 }
 328
 329 void cfg80211_sme_rx_auth(struct net_device *dev,
 330                           const u8 *buf, size_t len)
 331 {
 332         struct wireless_dev *wdev = dev->ieee80211_ptr;
 333         struct wiphy *wiphy = wdev->wiphy;
 334         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 335         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)buf;
 336         u16 status_code = le16_to_cpu(mgmt->u.auth.status_code);
 337
 338         ASSERT_WDEV_LOCK(wdev);
 339
 340         /* should only RX auth frames when connecting */
 341         if (wdev->sme_state != CFG80211_SME_CONNECTING)
 342                 return;
 343
 344         if (WARN_ON(!wdev->conn))
 345                 return;
 346
 347         if (status_code == WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG &&
 348             wdev->conn->auto_auth &&
 349             wdev->conn->params.auth_type != NL80211_AUTHTYPE_NETWORK_EAP) {
 350                 /* select automatically between only open, shared, leap */
 351                 switch (wdev->conn->params.auth_type) {
 352                 case NL80211_AUTHTYPE_OPEN_SYSTEM:
 353                         if (wdev->connect_keys)
 354                                 wdev->conn->params.auth_type =
 355                                         NL80211_AUTHTYPE_SHARED_KEY;
 356                         else
 357                                 wdev->conn->params.auth_type =
 358                                         NL80211_AUTHTYPE_NETWORK_EAP;
 359                         break;
 360                 case NL80211_AUTHTYPE_SHARED_KEY:
 361                         wdev->conn->params.auth_type =
 362                                 NL80211_AUTHTYPE_NETWORK_EAP;
 363                         break;
 364                 default:
 365                         /* huh? */
 366                         wdev->conn->params.auth_type =
 367                                 NL80211_AUTHTYPE_OPEN_SYSTEM;
 368                         break;
 369                 }
 370                 wdev->conn->state = CFG80211_CONN_AUTHENTICATE_NEXT;
 371                 schedule_work(&rdev->conn_work);
 372         } else if (status_code != WLAN_STATUS_SUCCESS) {
 373                 __cfg80211_connect_result(dev, mgmt->bssid, NULL, 0, NULL, 0,
 374                                           status_code, false, NULL);
 375         } else if (wdev->sme_state == CFG80211_SME_CONNECTING &&
 376                  wdev->conn->state == CFG80211_CONN_AUTHENTICATING) {
 377                 wdev->conn->state = CFG80211_CONN_ASSOCIATE_NEXT;
 378                 schedule_work(&rdev->conn_work);
 379         }
 380 }
 381
 382 bool cfg80211_sme_failed_reassoc(struct wireless_dev *wdev)
 383 {
 384         struct wiphy *wiphy = wdev->wiphy;
 385         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 386
 387         if (WARN_ON(!wdev->conn))
 388                 return false;
 389
 390         if (!wdev->conn->prev_bssid_valid)
 391                 return false;
 392
 393         /*
 394          * Some stupid APs don't accept reassoc, so we
 395          * need to fall back to trying regular assoc.
 396          */
 397         wdev->conn->prev_bssid_valid = false;
 398         wdev->conn->state = CFG80211_CONN_ASSOCIATE_NEXT;
 399         schedule_work(&rdev->conn_work);
 400
 401         return true;
 402 }
 403
 404 void cfg80211_sme_failed_assoc(struct wireless_dev *wdev)
 405 {
 406         struct wiphy *wiphy = wdev->wiphy;
 407         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 408
 409         wdev->conn->state = CFG80211_CONN_DEAUTH_ASSOC_FAIL;
 410         schedule_work(&rdev->conn_work);
 411 }
 412
 413 void __cfg80211_connect_result(struct net_device *dev, const u8 *bssid,
 414                                const u8 *req_ie, size_t req_ie_len,
 415                                const u8 *resp_ie, size_t resp_ie_len,
 416                                u16 status, bool wextev,
 417                                struct cfg80211_bss *bss)
 418 {
 419         struct wireless_dev *wdev = dev->ieee80211_ptr;
 420         const u8 *country_ie;
 421 #ifdef CONFIG_CFG80211_WEXT
 422         union iwreq_data wrqu;
 423 #endif
 424
 425         ASSERT_WDEV_LOCK(wdev);
 426
 427         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION &&
 428                     wdev->iftype != NL80211_IFTYPE_P2P_CLIENT))
 429                 return;
 430
 431         if (wdev->sme_state != CFG80211_SME_CONNECTING)
 432                 return;
 433
 434         nl80211_send_connect_result(wiphy_to_dev(wdev->wiphy), dev,
 435                                     bssid, req_ie, req_ie_len,
 436                                     resp_ie, resp_ie_len,
 437                                     status, GFP_KERNEL);
 438
 439 #ifdef CONFIG_CFG80211_WEXT
 440         if (wextev) {
 441                 if (req_ie && status == WLAN_STATUS_SUCCESS) {
 442                         memset(&wrqu, 0, sizeof(wrqu));
 443                         wrqu.data.length = req_ie_len;
 444                         wireless_send_event(dev, IWEVASSOCREQIE, &wrqu, req_ie);
 445                 }
 446
 447                 if (resp_ie && status == WLAN_STATUS_SUCCESS) {
 448                         memset(&wrqu, 0, sizeof(wrqu));
 449                         wrqu.data.length = resp_ie_len;
 450                         wireless_send_event(dev, IWEVASSOCRESPIE, &wrqu, resp_ie);
 451                 }
 452
 453                 memset(&wrqu, 0, sizeof(wrqu));
 454                 wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 455                 if (bssid && status == WLAN_STATUS_SUCCESS) {
 456                         memcpy(wrqu.ap_addr.sa_data, bssid, ETH_ALEN);
 457                         memcpy(wdev->wext.prev_bssid, bssid, ETH_ALEN);
 458                         wdev->wext.prev_bssid_valid = true;
 459                 }
 460                 wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL);
 461         }
 462 #endif
 463
 464         if (wdev->current_bss) {
 465                 cfg80211_unhold_bss(wdev->current_bss);
 466                 cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
 467                 wdev->current_bss = NULL;
 468         }
 469
 470         if (wdev->conn)
 471                 wdev->conn->state = CFG80211_CONN_IDLE;
 472
 473         if (status != WLAN_STATUS_SUCCESS) {
 474                 wdev->sme_state = CFG80211_SME_IDLE;
 475                 if (wdev->conn)
 476                         kfree(wdev->conn->ie);
 477                 kfree(wdev->conn);
 478                 wdev->conn = NULL;
 479                 kfree(wdev->connect_keys);
 480                 wdev->connect_keys = NULL;
 481                 wdev->ssid_len = 0;
 482                 cfg80211_put_bss(wdev->wiphy, bss);
 483                 return;
 484         }
 485
 486         if (!bss)
 487                 bss = cfg80211_get_bss(wdev->wiphy,
 488                                        wdev->conn ? wdev->conn->params.channel :
 489                                        NULL,
 490                                        bssid,
 491                                        wdev->ssid, wdev->ssid_len,
 492                                        WLAN_CAPABILITY_ESS,
 493                                        WLAN_CAPABILITY_ESS);
 494
 495         if (WARN_ON(!bss))
 496                 return;
 497
 498         cfg80211_hold_bss(bss_from_pub(bss));
 499         wdev->current_bss = bss_from_pub(bss);
 500
 501         wdev->sme_state = CFG80211_SME_CONNECTED;
 502         cfg80211_upload_connect_keys(wdev);
 503
 504         rcu_read_lock();
 505         country_ie = ieee80211_bss_get_ie(bss, WLAN_EID_COUNTRY);
 506         if (!country_ie) {
 507                 rcu_read_unlock();
 508                 return;
 509         }
 510
 511         country_ie = kmemdup(country_ie, 2 + country_ie[1], GFP_ATOMIC);
 512         rcu_read_unlock();
 513
 514         if (!country_ie)
 515                 return;
 516
 517         /*
 518          * ieee80211_bss_get_ie() ensures we can access:
 519          * - country_ie + 2, the start of the country ie data, and
 520          * - and country_ie[1] which is the IE length
 521          */
 522         regulatory_hint_11d(wdev->wiphy, bss->channel->band,
 523                             country_ie + 2, country_ie[1]);
 524         kfree(country_ie);
 525 }
 526
 527 void cfg80211_connect_result(struct net_device *dev, const u8 *bssid,
 528                              const u8 *req_ie, size_t req_ie_len,
 529                              const u8 *resp_ie, size_t resp_ie_len,
 530                              u16 status, gfp_t gfp)
 531 {
 532         struct wireless_dev *wdev = dev->ieee80211_ptr;
 533         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 534         struct cfg80211_event *ev;
 535         unsigned long flags;
 536
 537         CFG80211_DEV_WARN_ON(wdev->sme_state != CFG80211_SME_CONNECTING);
 538
 539         ev = kzalloc(sizeof(*ev) + req_ie_len + resp_ie_len, gfp);
 540         if (!ev)
 541                 return;
 542
 543         ev->type = EVENT_CONNECT_RESULT;
 544         if (bssid)
 545                 memcpy(ev->cr.bssid, bssid, ETH_ALEN);
 546         if (req_ie_len) {
 547                 ev->cr.req_ie = ((u8 *)ev) + sizeof(*ev);
 548                 ev->cr.req_ie_len = req_ie_len;
 549                 memcpy((void *)ev->cr.req_ie, req_ie, req_ie_len);
 550         }
 551         if (resp_ie_len) {
 552                 ev->cr.resp_ie = ((u8 *)ev) + sizeof(*ev) + req_ie_len;
 553                 ev->cr.resp_ie_len = resp_ie_len;
 554                 memcpy((void *)ev->cr.resp_ie, resp_ie, resp_ie_len);
 555         }
 556         ev->cr.status = status;
 557
 558         spin_lock_irqsave(&wdev->event_lock, flags);
 559         list_add_tail(&ev->list, &wdev->event_list);
 560         spin_unlock_irqrestore(&wdev->event_lock, flags);
 561         queue_work(cfg80211_wq, &rdev->event_work);
 562 }
 563 EXPORT_SYMBOL(cfg80211_connect_result);
 564
 565 void __cfg80211_roamed(struct wireless_dev *wdev,
 566                        struct cfg80211_bss *bss,
 567                        const u8 *req_ie, size_t req_ie_len,
 568                        const u8 *resp_ie, size_t resp_ie_len)
 569 {
 570 #ifdef CONFIG_CFG80211_WEXT
 571         union iwreq_data wrqu;
 572 #endif
 573         ASSERT_WDEV_LOCK(wdev);
 574
 575         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION &&
 576                     wdev->iftype != NL80211_IFTYPE_P2P_CLIENT))
 577                 goto out;
 578
 579         if (wdev->sme_state != CFG80211_SME_CONNECTED)
 580                 goto out;
 581
 582         /* internal error -- how did we get to CONNECTED w/o BSS? */
 583         if (WARN_ON(!wdev->current_bss)) {
 584                 goto out;
 585         }
 586
 587         cfg80211_unhold_bss(wdev->current_bss);
 588         cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
 589         wdev->current_bss = NULL;
 590
 591         cfg80211_hold_bss(bss_from_pub(bss));
 592         wdev->current_bss = bss_from_pub(bss);
 593
 594         nl80211_send_roamed(wiphy_to_dev(wdev->wiphy), wdev->netdev, bss->bssid,
 595                             req_ie, req_ie_len, resp_ie, resp_ie_len,
 596                             GFP_KERNEL);
 597
 598 #ifdef CONFIG_CFG80211_WEXT
 599         if (req_ie) {
 600                 memset(&wrqu, 0, sizeof(wrqu));
 601                 wrqu.data.length = req_ie_len;
 602                 wireless_send_event(wdev->netdev, IWEVASSOCREQIE,
 603                                     &wrqu, req_ie);
 604         }
 605
 606         if (resp_ie) {
 607                 memset(&wrqu, 0, sizeof(wrqu));
 608                 wrqu.data.length = resp_ie_len;
 609                 wireless_send_event(wdev->netdev, IWEVASSOCRESPIE,
 610                                     &wrqu, resp_ie);
 611         }
 612
 613         memset(&wrqu, 0, sizeof(wrqu));
 614         wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 615         memcpy(wrqu.ap_addr.sa_data, bss->bssid, ETH_ALEN);
 616         memcpy(wdev->wext.prev_bssid, bss->bssid, ETH_ALEN);
 617         wdev->wext.prev_bssid_valid = true;
 618         wireless_send_event(wdev->netdev, SIOCGIWAP, &wrqu, NULL);
 619 #endif
 620
 621         return;
 622 out:
 623         cfg80211_put_bss(wdev->wiphy, bss);
 624 }
 625
 626 void cfg80211_roamed(struct net_device *dev,
 627                      struct ieee80211_channel *channel,
 628                      const u8 *bssid,
 629                      const u8 *req_ie, size_t req_ie_len,
 630                      const u8 *resp_ie, size_t resp_ie_len, gfp_t gfp)
 631 {
 632         struct wireless_dev *wdev = dev->ieee80211_ptr;
 633         struct cfg80211_bss *bss;
 634
 635         CFG80211_DEV_WARN_ON(wdev->sme_state != CFG80211_SME_CONNECTED);
 636
 637         bss = cfg80211_get_bss(wdev->wiphy, channel, bssid, wdev->ssid,
 638                                wdev->ssid_len, WLAN_CAPABILITY_ESS,
 639                                WLAN_CAPABILITY_ESS);
 640         if (WARN_ON(!bss))
 641                 return;
 642
 643         cfg80211_roamed_bss(dev, bss, req_ie, req_ie_len, resp_ie,
 644                             resp_ie_len, gfp);
 645 }
 646 EXPORT_SYMBOL(cfg80211_roamed);
 647
 648 void cfg80211_roamed_bss(struct net_device *dev,
 649                          struct cfg80211_bss *bss, const u8 *req_ie,
 650                          size_t req_ie_len, const u8 *resp_ie,
 651                          size_t resp_ie_len, gfp_t gfp)
 652 {
 653         struct wireless_dev *wdev = dev->ieee80211_ptr;
 654         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 655         struct cfg80211_event *ev;
 656         unsigned long flags;
 657
 658         CFG80211_DEV_WARN_ON(wdev->sme_state != CFG80211_SME_CONNECTED);
 659
 660         if (WARN_ON(!bss))
 661                 return;
 662
 663         ev = kzalloc(sizeof(*ev) + req_ie_len + resp_ie_len, gfp);
 664         if (!ev) {
 665                 cfg80211_put_bss(wdev->wiphy, bss);
 666                 return;
 667         }
 668
 669         ev->type = EVENT_ROAMED;
 670         ev->rm.req_ie = ((u8 *)ev) + sizeof(*ev);
 671         ev->rm.req_ie_len = req_ie_len;
 672         memcpy((void *)ev->rm.req_ie, req_ie, req_ie_len);
 673         ev->rm.resp_ie = ((u8 *)ev) + sizeof(*ev) + req_ie_len;
 674         ev->rm.resp_ie_len = resp_ie_len;
 675         memcpy((void *)ev->rm.resp_ie, resp_ie, resp_ie_len);
 676         ev->rm.bss = bss;
 677
 678         spin_lock_irqsave(&wdev->event_lock, flags);
 679         list_add_tail(&ev->list, &wdev->event_list);
 680         spin_unlock_irqrestore(&wdev->event_lock, flags);
 681         queue_work(cfg80211_wq, &rdev->event_work);
 682 }
 683 EXPORT_SYMBOL(cfg80211_roamed_bss);
 684
 685 void __cfg80211_disconnected(struct net_device *dev, const u8 *ie,
 686                              size_t ie_len, u16 reason, bool from_ap)
 687 {
 688         struct wireless_dev *wdev = dev->ieee80211_ptr;
 689         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 690         int i;
 691 #ifdef CONFIG_CFG80211_WEXT
 692         union iwreq_data wrqu;
 693 #endif
 694
 695         ASSERT_WDEV_LOCK(wdev);
 696
 697         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION &&
 698                     wdev->iftype != NL80211_IFTYPE_P2P_CLIENT))
 699                 return;
 700
 701         if (wdev->sme_state != CFG80211_SME_CONNECTED)
 702                 return;
 703
 704         if (wdev->current_bss) {
 705                 cfg80211_unhold_bss(wdev->current_bss);
 706                 cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
 707         }
 708
 709         wdev->current_bss = NULL;
 710         wdev->sme_state = CFG80211_SME_IDLE;
 711         wdev->ssid_len = 0;
 712
 713         if (wdev->conn) {
 714                 kfree(wdev->conn->ie);
 715                 wdev->conn->ie = NULL;
 716                 kfree(wdev->conn);
 717                 wdev->conn = NULL;
 718         }
 719
 720         nl80211_send_disconnected(rdev, dev, reason, ie, ie_len, from_ap);
 721
 722         /*
 723          * Delete all the keys ... pairwise keys can't really
 724          * exist any more anyway, but default keys might.
 725          */
 726         if (rdev->ops->del_key)
 727                 for (i = 0; i < 6; i++)
 728                         rdev_del_key(rdev, dev, i, false, NULL);
 729
 730 #ifdef CONFIG_CFG80211_WEXT
 731         memset(&wrqu, 0, sizeof(wrqu));
 732         wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 733         wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL);
 734         wdev->wext.connect.ssid_len = 0;
 735 #endif
 736
 737         schedule_work(&cfg80211_disconnect_work);
 738 }
 739
 740 void cfg80211_disconnected(struct net_device *dev, u16 reason,
 741                            u8 *ie, size_t ie_len, gfp_t gfp)
 742 {
 743         struct wireless_dev *wdev = dev->ieee80211_ptr;
 744         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 745         struct cfg80211_event *ev;
 746         unsigned long flags;
 747
 748         CFG80211_DEV_WARN_ON(wdev->sme_state != CFG80211_SME_CONNECTED);
 749
 750         ev = kzalloc(sizeof(*ev) + ie_len, gfp);
 751         if (!ev)
 752                 return;
 753
 754         ev->type = EVENT_DISCONNECTED;
 755         ev->dc.ie = ((u8 *)ev) + sizeof(*ev);
 756         ev->dc.ie_len = ie_len;
 757         memcpy((void *)ev->dc.ie, ie, ie_len);
 758         ev->dc.reason = reason;
 759
 760         spin_lock_irqsave(&wdev->event_lock, flags);
 761         list_add_tail(&ev->list, &wdev->event_list);
 762         spin_unlock_irqrestore(&wdev->event_lock, flags);
 763         queue_work(cfg80211_wq, &rdev->event_work);
 764 }
 765 EXPORT_SYMBOL(cfg80211_disconnected);
 766
 767 int __cfg80211_connect(struct cfg80211_registered_device *rdev,
 768                        struct net_device *dev,
 769                        struct cfg80211_connect_params *connect,
 770                        struct cfg80211_cached_keys *connkeys,
 771                        const u8 *prev_bssid)
 772 {
 773         struct wireless_dev *wdev = dev->ieee80211_ptr;
 774         struct cfg80211_bss *bss = NULL;
 775         int err;
 776
 777         ASSERT_WDEV_LOCK(wdev);
 778
 779         if (wdev->sme_state != CFG80211_SME_IDLE)
 780                 return -EALREADY;
 781
 782         if (WARN_ON(wdev->connect_keys)) {
 783                 kfree(wdev->connect_keys);
 784                 wdev->connect_keys = NULL;
 785         }
 786
 787         cfg80211_oper_and_ht_capa(&connect->ht_capa_mask,
 788                                   rdev->wiphy.ht_capa_mod_mask);
 789
 790         if (connkeys && connkeys->def >= 0) {
 791                 int idx;
 792                 u32 cipher;
 793
 794                 idx = connkeys->def;
 795                 cipher = connkeys->params[idx].cipher;
 796                 /* If given a WEP key we may need it for shared key auth */
 797                 if (cipher == WLAN_CIPHER_SUITE_WEP40 ||
 798                     cipher == WLAN_CIPHER_SUITE_WEP104) {
 799                         connect->key_idx = idx;
 800                         connect->key = connkeys->params[idx].key;
 801                         connect->key_len = connkeys->params[idx].key_len;
 802
 803                         /*
 804                          * If ciphers are not set (e.g. when going through
 805                          * iwconfig), we have to set them appropriately here.
 806                          */
 807                         if (connect->crypto.cipher_group == 0)
 808                                 connect->crypto.cipher_group = cipher;
 809
 810                         if (connect->crypto.n_ciphers_pairwise == 0) {
 811                                 connect->crypto.n_ciphers_pairwise = 1;
 812                                 connect->crypto.ciphers_pairwise[0] = cipher;
 813                         }
 814                 }
 815         }
 816
 817         if (!rdev->ops->connect) {
 818                 if (!rdev->ops->auth || !rdev->ops->assoc)
 819                         return -EOPNOTSUPP;
 820
 821                 if (WARN_ON(wdev->conn))
 822                         return -EINPROGRESS;
 823
 824                 wdev->conn = kzalloc(sizeof(*wdev->conn), GFP_KERNEL);
 825                 if (!wdev->conn)
 826                         return -ENOMEM;
 827
 828                 /*
 829                  * Copy all parameters, and treat explicitly IEs, BSSID, SSID.
 830                  */
 831                 memcpy(&wdev->conn->params, connect, sizeof(*connect));
 832                 if (connect->bssid) {
 833                         wdev->conn->params.bssid = wdev->conn->bssid;
 834                         memcpy(wdev->conn->bssid, connect->bssid, ETH_ALEN);
 835                 }
 836
 837                 if (connect->ie) {
 838                         wdev->conn->ie = kmemdup(connect->ie, connect->ie_len,
 839                                                 GFP_KERNEL);
 840                         wdev->conn->params.ie = wdev->conn->ie;
 841                         if (!wdev->conn->ie) {
 842                                 kfree(wdev->conn);
 843                                 wdev->conn = NULL;
 844                                 return -ENOMEM;
 845                         }
 846                 }
 847
 848                 if (connect->auth_type == NL80211_AUTHTYPE_AUTOMATIC) {
 849                         wdev->conn->auto_auth = true;
 850                         /* start with open system ... should mostly work */
 851                         wdev->conn->params.auth_type =
 852                                 NL80211_AUTHTYPE_OPEN_SYSTEM;
 853                 } else {
 854                         wdev->conn->auto_auth = false;
 855                 }
 856
 857                 memcpy(wdev->ssid, connect->ssid, connect->ssid_len);
 858                 wdev->ssid_len = connect->ssid_len;
 859                 wdev->conn->params.ssid = wdev->ssid;
 860                 wdev->conn->params.ssid_len = connect->ssid_len;
 861
 862                 /* see if we have the bss already */
 863                 bss = cfg80211_get_conn_bss(wdev);
 864
 865                 wdev->sme_state = CFG80211_SME_CONNECTING;
 866                 wdev->connect_keys = connkeys;
 867
 868                 if (prev_bssid) {
 869                         memcpy(wdev->conn->prev_bssid, prev_bssid, ETH_ALEN);
 870                         wdev->conn->prev_bssid_valid = true;
 871                 }
 872
 873                 /* we're good if we have a matching bss struct */
 874                 if (bss) {
 875                         wdev->conn->state = CFG80211_CONN_AUTHENTICATE_NEXT;
 876                         err = cfg80211_conn_do_work(wdev);
 877                         cfg80211_put_bss(wdev->wiphy, bss);
 878                 } else {
 879                         /* otherwise we'll need to scan for the AP first */
 880                         err = cfg80211_conn_scan(wdev);
 881                         /*
 882                          * If we can't scan right now, then we need to scan again
 883                          * after the current scan finished, since the parameters
 884                          * changed (unless we find a good AP anyway).
 885                          */
 886                         if (err == -EBUSY) {
 887                                 err = 0;
 888                                 wdev->conn->state = CFG80211_CONN_SCAN_AGAIN;
 889                         }
 890                 }
 891                 if (err) {
 892                         kfree(wdev->conn->ie);
 893                         kfree(wdev->conn);
 894                         wdev->conn = NULL;
 895                         wdev->sme_state = CFG80211_SME_IDLE;
 896                         wdev->connect_keys = NULL;
 897                         wdev->ssid_len = 0;
 898                 }
 899
 900                 return err;
 901         } else {
 902                 wdev->sme_state = CFG80211_SME_CONNECTING;
 903                 wdev->connect_keys = connkeys;
 904                 err = rdev_connect(rdev, dev, connect);
 905                 if (err) {
 906                         wdev->connect_keys = NULL;
 907                         wdev->sme_state = CFG80211_SME_IDLE;
 908                         return err;
 909                 }
 910
 911                 memcpy(wdev->ssid, connect->ssid, connect->ssid_len);
 912                 wdev->ssid_len = connect->ssid_len;
 913
 914                 return 0;
 915         }
 916 }
 917
 918 int cfg80211_connect(struct cfg80211_registered_device *rdev,
 919                      struct net_device *dev,
 920                      struct cfg80211_connect_params *connect,
 921                      struct cfg80211_cached_keys *connkeys)
 922 {
 923         int err;
 924
 925         mutex_lock(&rdev->devlist_mtx);
 926         /* might request scan - scan_mtx -> wdev_mtx dependency */
 927         mutex_lock(&rdev->sched_scan_mtx);
 928         wdev_lock(dev->ieee80211_ptr);
 929         err = __cfg80211_connect(rdev, dev, connect, connkeys, NULL);
 930         wdev_unlock(dev->ieee80211_ptr);
 931         mutex_unlock(&rdev->sched_scan_mtx);
 932         mutex_unlock(&rdev->devlist_mtx);
 933
 934         return err;
 935 }
 936
 937 int __cfg80211_disconnect(struct cfg80211_registered_device *rdev,
 938                           struct net_device *dev, u16 reason, bool wextev)
 939 {
 940         struct wireless_dev *wdev = dev->ieee80211_ptr;
 941         int err;
 942
 943         ASSERT_WDEV_LOCK(wdev);
 944
 945         if (wdev->sme_state == CFG80211_SME_IDLE)
 946                 return -EINVAL;
 947
 948         kfree(wdev->connect_keys);
 949         wdev->connect_keys = NULL;
 950
 951         if (!rdev->ops->disconnect) {
 952                 if (!rdev->ops->deauth)
 953                         return -EOPNOTSUPP;
 954
 955                 /* was it connected by userspace SME? */
 956                 if (!wdev->conn) {
 957                         cfg80211_mlme_down(rdev, dev);
 958                         return 0;
 959                 }
 960
 961                 if (wdev->sme_state == CFG80211_SME_CONNECTING &&
 962                     (wdev->conn->state == CFG80211_CONN_SCANNING ||
 963                      wdev->conn->state == CFG80211_CONN_SCAN_AGAIN)) {
 964                         wdev->sme_state = CFG80211_SME_IDLE;
 965                         kfree(wdev->conn->ie);
 966                         kfree(wdev->conn);
 967                         wdev->conn = NULL;
 968                         wdev->ssid_len = 0;
 969                         return 0;
 970                 }
 971
 972                 /* wdev->conn->params.bssid must be set if > SCANNING */
 973                 err = __cfg80211_mlme_deauth(rdev, dev,
 974                                              wdev->conn->params.bssid,
 975                                              NULL, 0, reason, false);
 976                 if (err)
 977                         return err;
 978         } else {
 979                 err = rdev_disconnect(rdev, dev, reason);
 980                 if (err)
 981                         return err;
 982         }
 983
 984         if (wdev->sme_state == CFG80211_SME_CONNECTED)
 985                 __cfg80211_disconnected(dev, NULL, 0, 0, false);
 986         else if (wdev->sme_state == CFG80211_SME_CONNECTING)
 987                 __cfg80211_connect_result(dev, NULL, NULL, 0, NULL, 0,
 988                                           WLAN_STATUS_UNSPECIFIED_FAILURE,
 989                                           wextev, NULL);
 990
 991         return 0;
 992 }
 993
 994 int cfg80211_disconnect(struct cfg80211_registered_device *rdev,
 995                         struct net_device *dev,
 996                         u16 reason, bool wextev)
 997 {
 998         int err;
 999
1000         wdev_lock(dev->ieee80211_ptr);
1001         err = __cfg80211_disconnect(rdev, dev, reason, wextev);
1002         wdev_unlock(dev->ieee80211_ptr);
1003
1004         return err;
1005 }
1006
1007 void cfg80211_sme_disassoc(struct net_device *dev,
1008                            struct cfg80211_internal_bss *bss)
1009 {
1010         struct wireless_dev *wdev = dev->ieee80211_ptr;
1011         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
1012         u8 bssid[ETH_ALEN];
1013
1014         ASSERT_WDEV_LOCK(wdev);
1015
1016         if (!wdev->conn)
1017                 return;
1018
1019         if (wdev->conn->state == CFG80211_CONN_IDLE)
1020                 return;
1021
1022         /*
1023          * Ok, so the association was made by this SME -- we don't
1024          * want it any more so deauthenticate too.
1025          */
1026
1027         memcpy(bssid, bss->pub.bssid, ETH_ALEN);
1028
1029         __cfg80211_mlme_deauth(rdev, dev, bssid, NULL, 0,
1030                                WLAN_REASON_DEAUTH_LEAVING, false);
1031 }