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