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->netdev_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, false);
 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->netdev_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                 return;
 481         }
 482
 483         if (!bss)
 484                 bss = cfg80211_get_bss(wdev->wiphy,
 485                                        wdev->conn ? wdev->conn->params.channel :
 486                                        NULL,
 487                                        bssid,
 488                                        wdev->ssid, wdev->ssid_len,
 489                                        WLAN_CAPABILITY_ESS,
 490                                        WLAN_CAPABILITY_ESS);
 491
 492         if (WARN_ON(!bss))
 493                 return;
 494
 495         cfg80211_hold_bss(bss_from_pub(bss));
 496         wdev->current_bss = bss_from_pub(bss);
 497
 498         wdev->sme_state = CFG80211_SME_CONNECTED;
 499         cfg80211_upload_connect_keys(wdev);
 500
 501         country_ie = (u8 *) ieee80211_bss_get_ie(bss, WLAN_EID_COUNTRY);
 502
 503         if (!country_ie)
 504                 return;
 505
 506         /*
 507          * ieee80211_bss_get_ie() ensures we can access:
 508          * - country_ie + 2, the start of the country ie data, and
 509          * - and country_ie[1] which is the IE length
 510          */
 511         regulatory_hint_11d(wdev->wiphy,
 512                             bss->channel->band,
 513                             country_ie + 2,
 514                             country_ie[1]);
 515 }
 516
 517 void cfg80211_connect_result(struct net_device *dev, const u8 *bssid,
 518                              const u8 *req_ie, size_t req_ie_len,
 519                              const u8 *resp_ie, size_t resp_ie_len,
 520                              u16 status, gfp_t gfp)
 521 {
 522         struct wireless_dev *wdev = dev->ieee80211_ptr;
 523         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 524         struct cfg80211_event *ev;
 525         unsigned long flags;
 526
 527         CFG80211_DEV_WARN_ON(wdev->sme_state != CFG80211_SME_CONNECTING);
 528
 529         ev = kzalloc(sizeof(*ev) + req_ie_len + resp_ie_len, gfp);
 530         if (!ev)
 531                 return;
 532
 533         ev->type = EVENT_CONNECT_RESULT;
 534         if (bssid)
 535                 memcpy(ev->cr.bssid, bssid, ETH_ALEN);
 536         if (req_ie_len) {
 537                 ev->cr.req_ie = ((u8 *)ev) + sizeof(*ev);
 538                 ev->cr.req_ie_len = req_ie_len;
 539                 memcpy((void *)ev->cr.req_ie, req_ie, req_ie_len);
 540         }
 541         if (resp_ie_len) {
 542                 ev->cr.resp_ie = ((u8 *)ev) + sizeof(*ev) + req_ie_len;
 543                 ev->cr.resp_ie_len = resp_ie_len;
 544                 memcpy((void *)ev->cr.resp_ie, resp_ie, resp_ie_len);
 545         }
 546         ev->cr.status = status;
 547
 548         spin_lock_irqsave(&wdev->event_lock, flags);
 549         list_add_tail(&ev->list, &wdev->event_list);
 550         spin_unlock_irqrestore(&wdev->event_lock, flags);
 551         queue_work(cfg80211_wq, &rdev->event_work);
 552 }
 553 EXPORT_SYMBOL(cfg80211_connect_result);
 554
 555 void __cfg80211_roamed(struct wireless_dev *wdev,
 556                        struct ieee80211_channel *channel,
 557                        const u8 *bssid,
 558                        const u8 *req_ie, size_t req_ie_len,
 559                        const u8 *resp_ie, size_t resp_ie_len)
 560 {
 561         struct cfg80211_bss *bss;
 562 #ifdef CONFIG_CFG80211_WEXT
 563         union iwreq_data wrqu;
 564 #endif
 565
 566         ASSERT_WDEV_LOCK(wdev);
 567
 568         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION &&
 569                     wdev->iftype != NL80211_IFTYPE_P2P_CLIENT))
 570                 return;
 571
 572         if (wdev->sme_state != CFG80211_SME_CONNECTED)
 573                 return;
 574
 575         /* internal error -- how did we get to CONNECTED w/o BSS? */
 576         if (WARN_ON(!wdev->current_bss)) {
 577                 return;
 578         }
 579
 580         cfg80211_unhold_bss(wdev->current_bss);
 581         cfg80211_put_bss(&wdev->current_bss->pub);
 582         wdev->current_bss = NULL;
 583
 584         bss = cfg80211_get_bss(wdev->wiphy, channel, bssid,
 585                                wdev->ssid, wdev->ssid_len,
 586                                WLAN_CAPABILITY_ESS, WLAN_CAPABILITY_ESS);
 587
 588         if (WARN_ON(!bss))
 589                 return;
 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, 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, bssid, ETH_ALEN);
 616         memcpy(wdev->wext.prev_bssid, bssid, ETH_ALEN);
 617         wdev->wext.prev_bssid_valid = true;
 618         wireless_send_event(wdev->netdev, SIOCGIWAP, &wrqu, NULL);
 619 #endif
 620 }
 621
 622 void cfg80211_roamed(struct net_device *dev,
 623                      struct ieee80211_channel *channel,
 624                      const u8 *bssid,
 625                      const u8 *req_ie, size_t req_ie_len,
 626                      const u8 *resp_ie, size_t resp_ie_len, gfp_t gfp)
 627 {
 628         struct wireless_dev *wdev = dev->ieee80211_ptr;
 629         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 630         struct cfg80211_event *ev;
 631         unsigned long flags;
 632
 633         CFG80211_DEV_WARN_ON(wdev->sme_state != CFG80211_SME_CONNECTED);
 634
 635         ev = kzalloc(sizeof(*ev) + req_ie_len + resp_ie_len, gfp);
 636         if (!ev)
 637                 return;
 638
 639         ev->type = EVENT_ROAMED;
 640         ev->rm.channel = channel;
 641         memcpy(ev->rm.bssid, bssid, ETH_ALEN);
 642         ev->rm.req_ie = ((u8 *)ev) + sizeof(*ev);
 643         ev->rm.req_ie_len = req_ie_len;
 644         memcpy((void *)ev->rm.req_ie, req_ie, req_ie_len);
 645         ev->rm.resp_ie = ((u8 *)ev) + sizeof(*ev) + req_ie_len;
 646         ev->rm.resp_ie_len = resp_ie_len;
 647         memcpy((void *)ev->rm.resp_ie, resp_ie, resp_ie_len);
 648
 649         spin_lock_irqsave(&wdev->event_lock, flags);
 650         list_add_tail(&ev->list, &wdev->event_list);
 651         spin_unlock_irqrestore(&wdev->event_lock, flags);
 652         queue_work(cfg80211_wq, &rdev->event_work);
 653 }
 654 EXPORT_SYMBOL(cfg80211_roamed);
 655
 656 void __cfg80211_disconnected(struct net_device *dev, const u8 *ie,
 657                              size_t ie_len, u16 reason, bool from_ap)
 658 {
 659         struct wireless_dev *wdev = dev->ieee80211_ptr;
 660         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 661         int i;
 662 #ifdef CONFIG_CFG80211_WEXT
 663         union iwreq_data wrqu;
 664 #endif
 665
 666         ASSERT_WDEV_LOCK(wdev);
 667
 668         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION &&
 669                     wdev->iftype != NL80211_IFTYPE_P2P_CLIENT))
 670                 return;
 671
 672         if (wdev->sme_state != CFG80211_SME_CONNECTED)
 673                 return;
 674
 675         if (wdev->current_bss) {
 676                 cfg80211_unhold_bss(wdev->current_bss);
 677                 cfg80211_put_bss(&wdev->current_bss->pub);
 678         }
 679
 680         wdev->current_bss = NULL;
 681         wdev->sme_state = CFG80211_SME_IDLE;
 682         wdev->ssid_len = 0;
 683
 684         if (wdev->conn) {
 685                 const u8 *bssid;
 686                 int ret;
 687
 688                 kfree(wdev->conn->ie);
 689                 wdev->conn->ie = NULL;
 690                 kfree(wdev->conn);
 691                 wdev->conn = NULL;
 692
 693                 /*
 694                  * If this disconnect was due to a disassoc, we
 695                  * we might still have an auth BSS around. For
 696                  * the userspace SME that's currently expected,
 697                  * but for the kernel SME (nl80211 CONNECT or
 698                  * wireless extensions) we want to clear up all
 699                  * state.
 700                  */
 701                 for (i = 0; i < MAX_AUTH_BSSES; i++) {
 702                         if (!wdev->auth_bsses[i])
 703                                 continue;
 704                         bssid = wdev->auth_bsses[i]->pub.bssid;
 705                         ret = __cfg80211_mlme_deauth(rdev, dev, bssid, NULL, 0,
 706                                                 WLAN_REASON_DEAUTH_LEAVING,
 707                                                 false);
 708                         WARN(ret, "deauth failed: %d\n", ret);
 709                 }
 710         }
 711
 712         nl80211_send_disconnected(rdev, dev, reason, ie, ie_len, from_ap);
 713
 714         /*
 715          * Delete all the keys ... pairwise keys can't really
 716          * exist any more anyway, but default keys might.
 717          */
 718         if (rdev->ops->del_key)
 719                 for (i = 0; i < 6; i++)
 720                         rdev->ops->del_key(wdev->wiphy, dev, i, false, NULL);
 721
 722 #ifdef CONFIG_CFG80211_WEXT
 723         memset(&wrqu, 0, sizeof(wrqu));
 724         wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 725         wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL);
 726         wdev->wext.connect.ssid_len = 0;
 727 #endif
 728
 729         schedule_work(&cfg80211_disconnect_work);
 730 }
 731
 732 void cfg80211_disconnected(struct net_device *dev, u16 reason,
 733                            u8 *ie, size_t ie_len, gfp_t gfp)
 734 {
 735         struct wireless_dev *wdev = dev->ieee80211_ptr;
 736         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 737         struct cfg80211_event *ev;
 738         unsigned long flags;
 739
 740         CFG80211_DEV_WARN_ON(wdev->sme_state != CFG80211_SME_CONNECTED);
 741
 742         ev = kzalloc(sizeof(*ev) + ie_len, gfp);
 743         if (!ev)
 744                 return;
 745
 746         ev->type = EVENT_DISCONNECTED;
 747         ev->dc.ie = ((u8 *)ev) + sizeof(*ev);
 748         ev->dc.ie_len = ie_len;
 749         memcpy((void *)ev->dc.ie, ie, ie_len);
 750         ev->dc.reason = reason;
 751
 752         spin_lock_irqsave(&wdev->event_lock, flags);
 753         list_add_tail(&ev->list, &wdev->event_list);
 754         spin_unlock_irqrestore(&wdev->event_lock, flags);
 755         queue_work(cfg80211_wq, &rdev->event_work);
 756 }
 757 EXPORT_SYMBOL(cfg80211_disconnected);
 758
 759 int __cfg80211_connect(struct cfg80211_registered_device *rdev,
 760                        struct net_device *dev,
 761                        struct cfg80211_connect_params *connect,
 762                        struct cfg80211_cached_keys *connkeys,
 763                        const u8 *prev_bssid)
 764 {
 765         struct wireless_dev *wdev = dev->ieee80211_ptr;
 766         struct cfg80211_bss *bss = NULL;
 767         int err;
 768
 769         ASSERT_WDEV_LOCK(wdev);
 770
 771         if (wdev->sme_state != CFG80211_SME_IDLE)
 772                 return -EALREADY;
 773
 774         if (WARN_ON(wdev->connect_keys)) {
 775                 kfree(wdev->connect_keys);
 776                 wdev->connect_keys = NULL;
 777         }
 778
 779         cfg80211_oper_and_ht_capa(&connect->ht_capa_mask,
 780                                   rdev->wiphy.ht_capa_mod_mask);
 781
 782         if (connkeys && connkeys->def >= 0) {
 783                 int idx;
 784                 u32 cipher;
 785
 786                 idx = connkeys->def;
 787                 cipher = connkeys->params[idx].cipher;
 788                 /* If given a WEP key we may need it for shared key auth */
 789                 if (cipher == WLAN_CIPHER_SUITE_WEP40 ||
 790                     cipher == WLAN_CIPHER_SUITE_WEP104) {
 791                         connect->key_idx = idx;
 792                         connect->key = connkeys->params[idx].key;
 793                         connect->key_len = connkeys->params[idx].key_len;
 794
 795                         /*
 796                          * If ciphers are not set (e.g. when going through
 797                          * iwconfig), we have to set them appropriately here.
 798                          */
 799                         if (connect->crypto.cipher_group == 0)
 800                                 connect->crypto.cipher_group = cipher;
 801
 802                         if (connect->crypto.n_ciphers_pairwise == 0) {
 803                                 connect->crypto.n_ciphers_pairwise = 1;
 804                                 connect->crypto.ciphers_pairwise[0] = cipher;
 805                         }
 806                 }
 807         }
 808
 809         if (!rdev->ops->connect) {
 810                 if (!rdev->ops->auth || !rdev->ops->assoc)
 811                         return -EOPNOTSUPP;
 812
 813                 if (WARN_ON(wdev->conn))
 814                         return -EINPROGRESS;
 815
 816                 wdev->conn = kzalloc(sizeof(*wdev->conn), GFP_KERNEL);
 817                 if (!wdev->conn)
 818                         return -ENOMEM;
 819
 820                 /*
 821                  * Copy all parameters, and treat explicitly IEs, BSSID, SSID.
 822                  */
 823                 memcpy(&wdev->conn->params, connect, sizeof(*connect));
 824                 if (connect->bssid) {
 825                         wdev->conn->params.bssid = wdev->conn->bssid;
 826                         memcpy(wdev->conn->bssid, connect->bssid, ETH_ALEN);
 827                 }
 828
 829                 if (connect->ie) {
 830                         wdev->conn->ie = kmemdup(connect->ie, connect->ie_len,
 831                                                 GFP_KERNEL);
 832                         wdev->conn->params.ie = wdev->conn->ie;
 833                         if (!wdev->conn->ie) {
 834                                 kfree(wdev->conn);
 835                                 wdev->conn = NULL;
 836                                 return -ENOMEM;
 837                         }
 838                 }
 839
 840                 if (connect->auth_type == NL80211_AUTHTYPE_AUTOMATIC) {
 841                         wdev->conn->auto_auth = true;
 842                         /* start with open system ... should mostly work */
 843                         wdev->conn->params.auth_type =
 844                                 NL80211_AUTHTYPE_OPEN_SYSTEM;
 845                 } else {
 846                         wdev->conn->auto_auth = false;
 847                 }
 848
 849                 memcpy(wdev->ssid, connect->ssid, connect->ssid_len);
 850                 wdev->ssid_len = connect->ssid_len;
 851                 wdev->conn->params.ssid = wdev->ssid;
 852                 wdev->conn->params.ssid_len = connect->ssid_len;
 853
 854                 /* see if we have the bss already */
 855                 bss = cfg80211_get_conn_bss(wdev);
 856
 857                 wdev->sme_state = CFG80211_SME_CONNECTING;
 858                 wdev->connect_keys = connkeys;
 859
 860                 if (prev_bssid) {
 861                         memcpy(wdev->conn->prev_bssid, prev_bssid, ETH_ALEN);
 862                         wdev->conn->prev_bssid_valid = true;
 863                 }
 864
 865                 /* we're good if we have a matching bss struct */
 866                 if (bss) {
 867                         wdev->conn->state = CFG80211_CONN_AUTHENTICATE_NEXT;
 868                         err = cfg80211_conn_do_work(wdev);
 869                         cfg80211_put_bss(bss);
 870                 } else {
 871                         /* otherwise we'll need to scan for the AP first */
 872                         err = cfg80211_conn_scan(wdev);
 873                         /*
 874                          * If we can't scan right now, then we need to scan again
 875                          * after the current scan finished, since the parameters
 876                          * changed (unless we find a good AP anyway).
 877                          */
 878                         if (err == -EBUSY) {
 879                                 err = 0;
 880                                 wdev->conn->state = CFG80211_CONN_SCAN_AGAIN;
 881                         }
 882                 }
 883                 if (err) {
 884                         kfree(wdev->conn->ie);
 885                         kfree(wdev->conn);
 886                         wdev->conn = NULL;
 887                         wdev->sme_state = CFG80211_SME_IDLE;
 888                         wdev->connect_keys = NULL;
 889                         wdev->ssid_len = 0;
 890                 }
 891
 892                 return err;
 893         } else {
 894                 wdev->sme_state = CFG80211_SME_CONNECTING;
 895                 wdev->connect_keys = connkeys;
 896                 err = rdev->ops->connect(&rdev->wiphy, dev, connect);
 897                 if (err) {
 898                         wdev->connect_keys = NULL;
 899                         wdev->sme_state = CFG80211_SME_IDLE;
 900                         return err;
 901                 }
 902
 903                 memcpy(wdev->ssid, connect->ssid, connect->ssid_len);
 904                 wdev->ssid_len = connect->ssid_len;
 905
 906                 return 0;
 907         }
 908 }
 909
 910 int cfg80211_connect(struct cfg80211_registered_device *rdev,
 911                      struct net_device *dev,
 912                      struct cfg80211_connect_params *connect,
 913                      struct cfg80211_cached_keys *connkeys)
 914 {
 915         int err;
 916
 917         mutex_lock(&rdev->devlist_mtx);
 918         wdev_lock(dev->ieee80211_ptr);
 919         err = __cfg80211_connect(rdev, dev, connect, connkeys, NULL);
 920         wdev_unlock(dev->ieee80211_ptr);
 921         mutex_unlock(&rdev->devlist_mtx);
 922
 923         return err;
 924 }
 925
 926 int __cfg80211_disconnect(struct cfg80211_registered_device *rdev,
 927                           struct net_device *dev, u16 reason, bool wextev)
 928 {
 929         struct wireless_dev *wdev = dev->ieee80211_ptr;
 930         int err;
 931
 932         ASSERT_WDEV_LOCK(wdev);
 933
 934         if (wdev->sme_state == CFG80211_SME_IDLE)
 935                 return -EINVAL;
 936
 937         kfree(wdev->connect_keys);
 938         wdev->connect_keys = NULL;
 939
 940         if (!rdev->ops->disconnect) {
 941                 if (!rdev->ops->deauth)
 942                         return -EOPNOTSUPP;
 943
 944                 /* was it connected by userspace SME? */
 945                 if (!wdev->conn) {
 946                         cfg80211_mlme_down(rdev, dev);
 947                         return 0;
 948                 }
 949
 950                 if (wdev->sme_state == CFG80211_SME_CONNECTING &&
 951                     (wdev->conn->state == CFG80211_CONN_SCANNING ||
 952                      wdev->conn->state == CFG80211_CONN_SCAN_AGAIN)) {
 953                         wdev->sme_state = CFG80211_SME_IDLE;
 954                         kfree(wdev->conn->ie);
 955                         kfree(wdev->conn);
 956                         wdev->conn = NULL;
 957                         wdev->ssid_len = 0;
 958                         return 0;
 959                 }
 960
 961                 /* wdev->conn->params.bssid must be set if > SCANNING */
 962                 err = __cfg80211_mlme_deauth(rdev, dev,
 963                                              wdev->conn->params.bssid,
 964                                              NULL, 0, reason, false);
 965                 if (err)
 966                         return err;
 967         } else {
 968                 err = rdev->ops->disconnect(&rdev->wiphy, dev, reason);
 969                 if (err)
 970                         return err;
 971         }
 972
 973         if (wdev->sme_state == CFG80211_SME_CONNECTED)
 974                 __cfg80211_disconnected(dev, NULL, 0, 0, false);
 975         else if (wdev->sme_state == CFG80211_SME_CONNECTING)
 976                 __cfg80211_connect_result(dev, NULL, NULL, 0, NULL, 0,
 977                                           WLAN_STATUS_UNSPECIFIED_FAILURE,
 978                                           wextev, NULL);
 979
 980         return 0;
 981 }
 982
 983 int cfg80211_disconnect(struct cfg80211_registered_device *rdev,
 984                         struct net_device *dev,
 985                         u16 reason, bool wextev)
 986 {
 987         int err;
 988
 989         wdev_lock(dev->ieee80211_ptr);
 990         err = __cfg80211_disconnect(rdev, dev, reason, wextev);
 991         wdev_unlock(dev->ieee80211_ptr);
 992
 993         return err;
 994 }
 995
 996 void cfg80211_sme_disassoc(struct net_device *dev, int idx)
 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         if (!wdev->auth_bsses[idx])
1016                 return;
1017
1018         memcpy(bssid, wdev->auth_bsses[idx]->pub.bssid, ETH_ALEN);
1019         if (__cfg80211_mlme_deauth(rdev, dev, bssid,
1020                                    NULL, 0, WLAN_REASON_DEAUTH_LEAVING,
1021                                    false)) {
1022                 /* whatever -- assume gone anyway */
1023                 cfg80211_unhold_bss(wdev->auth_bsses[idx]);
1024                 cfg80211_put_bss(&wdev->auth_bsses[idx]->pub);
1025                 wdev->auth_bsses[idx] = NULL;
1026         }
1027 }