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