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];
  31         u8 *ie;
  32         size_t ie_len;
  33         bool auto_auth;
  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         request->channels = (void *)((char *)request + sizeof(*request));
  69         if (wdev->conn->params.channel)
  70                 request->channels[0] = wdev->conn->params.channel;
  71         else {
  72                 int i = 0, j;
  73                 enum ieee80211_band band;
  74
  75                 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
  76                         if (!wdev->wiphy->bands[band])
  77                                 continue;
  78                         for (j = 0; j < wdev->wiphy->bands[band]->n_channels;
  79                              i++, j++)
  80                                 request->channels[i] =
  81                                         &wdev->wiphy->bands[band]->channels[j];
  82                 }
  83         }
  84         request->n_channels = n_channels;
  85         request->ssids = (void *)(request->channels + n_channels);
  86         request->n_ssids = 1;
  87
  88         memcpy(request->ssids[0].ssid, wdev->conn->params.ssid,
  89                 wdev->conn->params.ssid_len);
  90         request->ssids[0].ssid_len = wdev->conn->params.ssid_len;
  91
  92         request->dev = wdev->netdev;
  93         request->wiphy = &rdev->wiphy;
  94
  95         rdev->scan_req = request;
  96
  97         err = rdev->ops->scan(wdev->wiphy, wdev->netdev, request);
  98         if (!err) {
  99                 wdev->conn->state = CFG80211_CONN_SCANNING;
 100                 nl80211_send_scan_start(rdev, wdev->netdev);
 101                 dev_hold(wdev->netdev);
 102         } else {
 103                 rdev->scan_req = NULL;
 104                 kfree(request);
 105         }
 106         return err;
 107 }
 108
 109 static int cfg80211_conn_do_work(struct wireless_dev *wdev)
 110 {
 111         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 112         struct cfg80211_connect_params *params;
 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                 /*
 139                  * We could, later, implement roaming here and then actually
 140                  * set prev_bssid to non-NULL. But then we need to be aware
 141                  * that some APs don't like that -- so we'd need to retry
 142                  * the association.
 143                  */
 144                 err = __cfg80211_mlme_assoc(rdev, wdev->netdev,
 145                                             params->channel, params->bssid,
 146                                             NULL,
 147                                             params->ssid, params->ssid_len,
 148                                             params->ie, params->ie_len,
 149                                             false, &params->crypto);
 150                 if (err)
 151                         __cfg80211_mlme_deauth(rdev, wdev->netdev, params->bssid,
 152                                                NULL, 0,
 153                                                WLAN_REASON_DEAUTH_LEAVING);
 154                 return err;
 155         default:
 156                 return 0;
 157         }
 158 }
 159
 160 void cfg80211_conn_work(struct work_struct *work)
 161 {
 162         struct cfg80211_registered_device *rdev =
 163                 container_of(work, struct cfg80211_registered_device, conn_work);
 164         struct wireless_dev *wdev;
 165
 166         rtnl_lock();
 167         cfg80211_lock_rdev(rdev);
 168         mutex_lock(&rdev->devlist_mtx);
 169
 170         list_for_each_entry(wdev, &rdev->netdev_list, list) {
 171                 wdev_lock(wdev);
 172                 if (!netif_running(wdev->netdev)) {
 173                         wdev_unlock(wdev);
 174                         continue;
 175                 }
 176                 if (wdev->sme_state != CFG80211_SME_CONNECTING) {
 177                         wdev_unlock(wdev);
 178                         continue;
 179                 }
 180                 if (cfg80211_conn_do_work(wdev))
 181                         __cfg80211_connect_result(
 182                                         wdev->netdev,
 183                                         wdev->conn->params.bssid,
 184                                         NULL, 0, NULL, 0,
 185                                         WLAN_STATUS_UNSPECIFIED_FAILURE,
 186                                         false, NULL);
 187                 wdev_unlock(wdev);
 188         }
 189
 190         mutex_unlock(&rdev->devlist_mtx);
 191         cfg80211_unlock_rdev(rdev);
 192         rtnl_unlock();
 193 }
 194
 195 static bool cfg80211_get_conn_bss(struct wireless_dev *wdev)
 196 {
 197         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 198         struct cfg80211_bss *bss;
 199         u16 capa = WLAN_CAPABILITY_ESS;
 200
 201         ASSERT_WDEV_LOCK(wdev);
 202
 203         if (wdev->conn->params.privacy)
 204                 capa |= WLAN_CAPABILITY_PRIVACY;
 205
 206         bss = cfg80211_get_bss(wdev->wiphy, NULL, wdev->conn->params.bssid,
 207                                wdev->conn->params.ssid,
 208                                wdev->conn->params.ssid_len,
 209                                WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_PRIVACY,
 210                                capa);
 211         if (!bss)
 212                 return false;
 213
 214         memcpy(wdev->conn->bssid, bss->bssid, ETH_ALEN);
 215         wdev->conn->params.bssid = wdev->conn->bssid;
 216         wdev->conn->params.channel = bss->channel;
 217         wdev->conn->state = CFG80211_CONN_AUTHENTICATE_NEXT;
 218         schedule_work(&rdev->conn_work);
 219
 220         cfg80211_put_bss(bss);
 221         return true;
 222 }
 223
 224 static void __cfg80211_sme_scan_done(struct net_device *dev)
 225 {
 226         struct wireless_dev *wdev = dev->ieee80211_ptr;
 227         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 228
 229         ASSERT_WDEV_LOCK(wdev);
 230
 231         if (wdev->sme_state != CFG80211_SME_CONNECTING)
 232                 return;
 233
 234         if (!wdev->conn)
 235                 return;
 236
 237         if (wdev->conn->state != CFG80211_CONN_SCANNING &&
 238             wdev->conn->state != CFG80211_CONN_SCAN_AGAIN)
 239                 return;
 240
 241         if (!cfg80211_get_conn_bss(wdev)) {
 242                 /* not found */
 243                 if (wdev->conn->state == CFG80211_CONN_SCAN_AGAIN)
 244                         schedule_work(&rdev->conn_work);
 245                 else
 246                         __cfg80211_connect_result(
 247                                         wdev->netdev,
 248                                         wdev->conn->params.bssid,
 249                                         NULL, 0, NULL, 0,
 250                                         WLAN_STATUS_UNSPECIFIED_FAILURE,
 251                                         false, NULL);
 252         }
 253 }
 254
 255 void cfg80211_sme_scan_done(struct net_device *dev)
 256 {
 257         struct wireless_dev *wdev = dev->ieee80211_ptr;
 258
 259         mutex_lock(&wiphy_to_dev(wdev->wiphy)->devlist_mtx);
 260         wdev_lock(wdev);
 261         __cfg80211_sme_scan_done(dev);
 262         wdev_unlock(wdev);
 263         mutex_unlock(&wiphy_to_dev(wdev->wiphy)->devlist_mtx);
 264 }
 265
 266 void cfg80211_sme_rx_auth(struct net_device *dev,
 267                           const u8 *buf, size_t len)
 268 {
 269         struct wireless_dev *wdev = dev->ieee80211_ptr;
 270         struct wiphy *wiphy = wdev->wiphy;
 271         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 272         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)buf;
 273         u16 status_code = le16_to_cpu(mgmt->u.auth.status_code);
 274
 275         ASSERT_WDEV_LOCK(wdev);
 276
 277         /* should only RX auth frames when connecting */
 278         if (wdev->sme_state != CFG80211_SME_CONNECTING)
 279                 return;
 280
 281         if (WARN_ON(!wdev->conn))
 282                 return;
 283
 284         if (status_code == WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG &&
 285             wdev->conn->auto_auth &&
 286             wdev->conn->params.auth_type != NL80211_AUTHTYPE_NETWORK_EAP) {
 287                 /* select automatically between only open, shared, leap */
 288                 switch (wdev->conn->params.auth_type) {
 289                 case NL80211_AUTHTYPE_OPEN_SYSTEM:
 290                         if (wdev->connect_keys)
 291                                 wdev->conn->params.auth_type =
 292                                         NL80211_AUTHTYPE_SHARED_KEY;
 293                         else
 294                                 wdev->conn->params.auth_type =
 295                                         NL80211_AUTHTYPE_NETWORK_EAP;
 296                         break;
 297                 case NL80211_AUTHTYPE_SHARED_KEY:
 298                         wdev->conn->params.auth_type =
 299                                 NL80211_AUTHTYPE_NETWORK_EAP;
 300                         break;
 301                 default:
 302                         /* huh? */
 303                         wdev->conn->params.auth_type =
 304                                 NL80211_AUTHTYPE_OPEN_SYSTEM;
 305                         break;
 306                 }
 307                 wdev->conn->state = CFG80211_CONN_AUTHENTICATE_NEXT;
 308                 schedule_work(&rdev->conn_work);
 309         } else if (status_code != WLAN_STATUS_SUCCESS) {
 310                 __cfg80211_connect_result(dev, mgmt->bssid, NULL, 0, NULL, 0,
 311                                           status_code, false, NULL);
 312         } else if (wdev->sme_state == CFG80211_SME_CONNECTING &&
 313                  wdev->conn->state == CFG80211_CONN_AUTHENTICATING) {
 314                 wdev->conn->state = CFG80211_CONN_ASSOCIATE_NEXT;
 315                 schedule_work(&rdev->conn_work);
 316         }
 317 }
 318
 319 void __cfg80211_connect_result(struct net_device *dev, const u8 *bssid,
 320                                const u8 *req_ie, size_t req_ie_len,
 321                                const u8 *resp_ie, size_t resp_ie_len,
 322                                u16 status, bool wextev,
 323                                struct cfg80211_bss *bss)
 324 {
 325         struct wireless_dev *wdev = dev->ieee80211_ptr;
 326         u8 *country_ie;
 327 #ifdef CONFIG_WIRELESS_EXT
 328         union iwreq_data wrqu;
 329 #endif
 330
 331         ASSERT_WDEV_LOCK(wdev);
 332
 333         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
 334                 return;
 335
 336         if (wdev->sme_state == CFG80211_SME_CONNECTED)
 337                 nl80211_send_roamed(wiphy_to_dev(wdev->wiphy), dev,
 338                                     bssid, req_ie, req_ie_len,
 339                                     resp_ie, resp_ie_len, GFP_KERNEL);
 340         else
 341                 nl80211_send_connect_result(wiphy_to_dev(wdev->wiphy), dev,
 342                                             bssid, req_ie, req_ie_len,
 343                                             resp_ie, resp_ie_len,
 344                                             status, GFP_KERNEL);
 345
 346 #ifdef CONFIG_WIRELESS_EXT
 347         if (wextev) {
 348                 if (req_ie && status == WLAN_STATUS_SUCCESS) {
 349                         memset(&wrqu, 0, sizeof(wrqu));
 350                         wrqu.data.length = req_ie_len;
 351                         wireless_send_event(dev, IWEVASSOCREQIE, &wrqu, req_ie);
 352                 }
 353
 354                 if (resp_ie && status == WLAN_STATUS_SUCCESS) {
 355                         memset(&wrqu, 0, sizeof(wrqu));
 356                         wrqu.data.length = resp_ie_len;
 357                         wireless_send_event(dev, IWEVASSOCRESPIE, &wrqu, resp_ie);
 358                 }
 359
 360                 memset(&wrqu, 0, sizeof(wrqu));
 361                 wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 362                 if (bssid && status == WLAN_STATUS_SUCCESS)
 363                         memcpy(wrqu.ap_addr.sa_data, bssid, ETH_ALEN);
 364                 wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL);
 365         }
 366 #endif
 367
 368         if (wdev->current_bss) {
 369                 cfg80211_unhold_bss(wdev->current_bss);
 370                 cfg80211_put_bss(&wdev->current_bss->pub);
 371                 wdev->current_bss = NULL;
 372         }
 373
 374         if (status == WLAN_STATUS_SUCCESS &&
 375             wdev->sme_state == CFG80211_SME_IDLE)
 376                 goto success;
 377
 378         if (wdev->sme_state != CFG80211_SME_CONNECTING)
 379                 return;
 380
 381         if (wdev->conn)
 382                 wdev->conn->state = CFG80211_CONN_IDLE;
 383
 384         if (status != WLAN_STATUS_SUCCESS) {
 385                 wdev->sme_state = CFG80211_SME_IDLE;
 386                 kfree(wdev->conn);
 387                 wdev->conn = NULL;
 388                 kfree(wdev->connect_keys);
 389                 wdev->connect_keys = NULL;
 390                 wdev->ssid_len = 0;
 391                 return;
 392         }
 393
 394  success:
 395         if (!bss)
 396                 bss = cfg80211_get_bss(wdev->wiphy, NULL, bssid,
 397                                        wdev->ssid, wdev->ssid_len,
 398                                        WLAN_CAPABILITY_ESS,
 399                                        WLAN_CAPABILITY_ESS);
 400
 401         if (WARN_ON(!bss))
 402                 return;
 403
 404         cfg80211_hold_bss(bss_from_pub(bss));
 405         wdev->current_bss = bss_from_pub(bss);
 406
 407         wdev->sme_state = CFG80211_SME_CONNECTED;
 408         cfg80211_upload_connect_keys(wdev);
 409
 410         country_ie = (u8 *) ieee80211_bss_get_ie(bss, WLAN_EID_COUNTRY);
 411
 412         if (!country_ie)
 413                 return;
 414
 415         /*
 416          * ieee80211_bss_get_ie() ensures we can access:
 417          * - country_ie + 2, the start of the country ie data, and
 418          * - and country_ie[1] which is the IE length
 419          */
 420         regulatory_hint_11d(wdev->wiphy,
 421                             country_ie + 2,
 422                             country_ie[1]);
 423 }
 424
 425 void cfg80211_connect_result(struct net_device *dev, const u8 *bssid,
 426                              const u8 *req_ie, size_t req_ie_len,
 427                              const u8 *resp_ie, size_t resp_ie_len,
 428                              u16 status, gfp_t gfp)
 429 {
 430         struct wireless_dev *wdev = dev->ieee80211_ptr;
 431         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 432         struct cfg80211_event *ev;
 433         unsigned long flags;
 434
 435         ev = kzalloc(sizeof(*ev) + req_ie_len + resp_ie_len, gfp);
 436         if (!ev)
 437                 return;
 438
 439         ev->type = EVENT_CONNECT_RESULT;
 440         memcpy(ev->cr.bssid, bssid, ETH_ALEN);
 441         ev->cr.req_ie = ((u8 *)ev) + sizeof(*ev);
 442         ev->cr.req_ie_len = req_ie_len;
 443         memcpy((void *)ev->cr.req_ie, req_ie, req_ie_len);
 444         ev->cr.resp_ie = ((u8 *)ev) + sizeof(*ev) + req_ie_len;
 445         ev->cr.resp_ie_len = resp_ie_len;
 446         memcpy((void *)ev->cr.resp_ie, resp_ie, resp_ie_len);
 447         ev->cr.status = status;
 448
 449         spin_lock_irqsave(&wdev->event_lock, flags);
 450         list_add_tail(&ev->list, &wdev->event_list);
 451         spin_unlock_irqrestore(&wdev->event_lock, flags);
 452         schedule_work(&rdev->event_work);
 453 }
 454 EXPORT_SYMBOL(cfg80211_connect_result);
 455
 456 void __cfg80211_roamed(struct wireless_dev *wdev, const u8 *bssid,
 457                        const u8 *req_ie, size_t req_ie_len,
 458                        const u8 *resp_ie, size_t resp_ie_len)
 459 {
 460         struct cfg80211_bss *bss;
 461 #ifdef CONFIG_WIRELESS_EXT
 462         union iwreq_data wrqu;
 463 #endif
 464
 465         ASSERT_WDEV_LOCK(wdev);
 466
 467         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
 468                 return;
 469
 470         if (WARN_ON(wdev->sme_state != CFG80211_SME_CONNECTED))
 471                 return;
 472
 473         /* internal error -- how did we get to CONNECTED w/o BSS? */
 474         if (WARN_ON(!wdev->current_bss)) {
 475                 return;
 476         }
 477
 478         cfg80211_unhold_bss(wdev->current_bss);
 479         cfg80211_put_bss(&wdev->current_bss->pub);
 480         wdev->current_bss = NULL;
 481
 482         bss = cfg80211_get_bss(wdev->wiphy, NULL, bssid,
 483                                wdev->ssid, wdev->ssid_len,
 484                                WLAN_CAPABILITY_ESS, WLAN_CAPABILITY_ESS);
 485
 486         if (WARN_ON(!bss))
 487                 return;
 488
 489         cfg80211_hold_bss(bss_from_pub(bss));
 490         wdev->current_bss = bss_from_pub(bss);
 491
 492         nl80211_send_roamed(wiphy_to_dev(wdev->wiphy), wdev->netdev, bssid,
 493                             req_ie, req_ie_len, resp_ie, resp_ie_len,
 494                             GFP_KERNEL);
 495
 496 #ifdef CONFIG_WIRELESS_EXT
 497         if (req_ie) {
 498                 memset(&wrqu, 0, sizeof(wrqu));
 499                 wrqu.data.length = req_ie_len;
 500                 wireless_send_event(wdev->netdev, IWEVASSOCREQIE,
 501                                     &wrqu, req_ie);
 502         }
 503
 504         if (resp_ie) {
 505                 memset(&wrqu, 0, sizeof(wrqu));
 506                 wrqu.data.length = resp_ie_len;
 507                 wireless_send_event(wdev->netdev, IWEVASSOCRESPIE,
 508                                     &wrqu, resp_ie);
 509         }
 510
 511         memset(&wrqu, 0, sizeof(wrqu));
 512         wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 513         memcpy(wrqu.ap_addr.sa_data, bssid, ETH_ALEN);
 514         wireless_send_event(wdev->netdev, SIOCGIWAP, &wrqu, NULL);
 515 #endif
 516 }
 517
 518 void cfg80211_roamed(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, 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         ev = kzalloc(sizeof(*ev) + req_ie_len + resp_ie_len, gfp);
 528         if (!ev)
 529                 return;
 530
 531         ev->type = EVENT_ROAMED;
 532         memcpy(ev->rm.bssid, bssid, ETH_ALEN);
 533         ev->rm.req_ie = ((u8 *)ev) + sizeof(*ev);
 534         ev->rm.req_ie_len = req_ie_len;
 535         memcpy((void *)ev->rm.req_ie, req_ie, req_ie_len);
 536         ev->rm.resp_ie = ((u8 *)ev) + sizeof(*ev) + req_ie_len;
 537         ev->rm.resp_ie_len = resp_ie_len;
 538         memcpy((void *)ev->rm.resp_ie, resp_ie, resp_ie_len);
 539
 540         spin_lock_irqsave(&wdev->event_lock, flags);
 541         list_add_tail(&ev->list, &wdev->event_list);
 542         spin_unlock_irqrestore(&wdev->event_lock, flags);
 543         schedule_work(&rdev->event_work);
 544 }
 545 EXPORT_SYMBOL(cfg80211_roamed);
 546
 547 void __cfg80211_disconnected(struct net_device *dev, const u8 *ie,
 548                              size_t ie_len, u16 reason, bool from_ap)
 549 {
 550         struct wireless_dev *wdev = dev->ieee80211_ptr;
 551         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 552         int i;
 553 #ifdef CONFIG_WIRELESS_EXT
 554         union iwreq_data wrqu;
 555 #endif
 556
 557         ASSERT_WDEV_LOCK(wdev);
 558
 559         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
 560                 return;
 561
 562         if (WARN_ON(wdev->sme_state != CFG80211_SME_CONNECTED))
 563                 return;
 564
 565         if (wdev->current_bss) {
 566                 cfg80211_unhold_bss(wdev->current_bss);
 567                 cfg80211_put_bss(&wdev->current_bss->pub);
 568         }
 569
 570         wdev->current_bss = NULL;
 571         wdev->sme_state = CFG80211_SME_IDLE;
 572         wdev->ssid_len = 0;
 573
 574         if (wdev->conn) {
 575                 const u8 *bssid;
 576                 int ret;
 577
 578                 kfree(wdev->conn->ie);
 579                 wdev->conn->ie = NULL;
 580                 kfree(wdev->conn);
 581                 wdev->conn = NULL;
 582
 583                 /*
 584                  * If this disconnect was due to a disassoc, we
 585                  * we might still have an auth BSS around. For
 586                  * the userspace SME that's currently expected,
 587                  * but for the kernel SME (nl80211 CONNECT or
 588                  * wireless extensions) we want to clear up all
 589                  * state.
 590                  */
 591                 for (i = 0; i < MAX_AUTH_BSSES; i++) {
 592                         if (!wdev->auth_bsses[i])
 593                                 continue;
 594                         bssid = wdev->auth_bsses[i]->pub.bssid;
 595                         ret = __cfg80211_mlme_deauth(rdev, dev, bssid, NULL, 0,
 596                                                 WLAN_REASON_DEAUTH_LEAVING);
 597                         WARN(ret, "deauth failed: %d\n", ret);
 598                 }
 599         }
 600
 601         nl80211_send_disconnected(rdev, dev, reason, ie, ie_len, from_ap);
 602
 603         /*
 604          * Delete all the keys ... pairwise keys can't really
 605          * exist any more anyway, but default keys might.
 606          */
 607         if (rdev->ops->del_key)
 608                 for (i = 0; i < 6; i++)
 609                         rdev->ops->del_key(wdev->wiphy, dev, i, NULL);
 610
 611 #ifdef CONFIG_WIRELESS_EXT
 612         memset(&wrqu, 0, sizeof(wrqu));
 613         wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 614         wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL);
 615 #endif
 616 }
 617
 618 void cfg80211_disconnected(struct net_device *dev, u16 reason,
 619                            u8 *ie, size_t ie_len, gfp_t gfp)
 620 {
 621         struct wireless_dev *wdev = dev->ieee80211_ptr;
 622         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 623         struct cfg80211_event *ev;
 624         unsigned long flags;
 625
 626         ev = kzalloc(sizeof(*ev) + ie_len, gfp);
 627         if (!ev)
 628                 return;
 629
 630         ev->type = EVENT_DISCONNECTED;
 631         ev->dc.ie = ((u8 *)ev) + sizeof(*ev);
 632         ev->dc.ie_len = ie_len;
 633         memcpy((void *)ev->dc.ie, ie, ie_len);
 634         ev->dc.reason = reason;
 635
 636         spin_lock_irqsave(&wdev->event_lock, flags);
 637         list_add_tail(&ev->list, &wdev->event_list);
 638         spin_unlock_irqrestore(&wdev->event_lock, flags);
 639         schedule_work(&rdev->event_work);
 640 }
 641 EXPORT_SYMBOL(cfg80211_disconnected);
 642
 643 int __cfg80211_connect(struct cfg80211_registered_device *rdev,
 644                        struct net_device *dev,
 645                        struct cfg80211_connect_params *connect,
 646                        struct cfg80211_cached_keys *connkeys)
 647 {
 648         struct wireless_dev *wdev = dev->ieee80211_ptr;
 649         struct ieee80211_channel *chan;
 650         int err;
 651
 652         ASSERT_WDEV_LOCK(wdev);
 653
 654         if (wdev->sme_state != CFG80211_SME_IDLE)
 655                 return -EALREADY;
 656
 657         chan = rdev_fixed_channel(rdev, wdev);
 658         if (chan && chan != connect->channel)
 659                 return -EBUSY;
 660
 661         if (WARN_ON(wdev->connect_keys)) {
 662                 kfree(wdev->connect_keys);
 663                 wdev->connect_keys = NULL;
 664         }
 665
 666         if (connkeys && connkeys->def >= 0) {
 667                 int idx;
 668                 u32 cipher;
 669
 670                 idx = connkeys->def;
 671                 cipher = connkeys->params[idx].cipher;
 672                 /* If given a WEP key we may need it for shared key auth */
 673                 if (cipher == WLAN_CIPHER_SUITE_WEP40 ||
 674                     cipher == WLAN_CIPHER_SUITE_WEP104) {
 675                         connect->key_idx = idx;
 676                         connect->key = connkeys->params[idx].key;
 677                         connect->key_len = connkeys->params[idx].key_len;
 678
 679                         /*
 680                          * If ciphers are not set (e.g. when going through
 681                          * iwconfig), we have to set them appropriately here.
 682                          */
 683                         if (connect->crypto.cipher_group == 0)
 684                                 connect->crypto.cipher_group = cipher;
 685
 686                         if (connect->crypto.n_ciphers_pairwise == 0) {
 687                                 connect->crypto.n_ciphers_pairwise = 1;
 688                                 connect->crypto.ciphers_pairwise[0] = cipher;
 689                         }
 690                 }
 691         }
 692
 693         if (!rdev->ops->connect) {
 694                 if (!rdev->ops->auth || !rdev->ops->assoc)
 695                         return -EOPNOTSUPP;
 696
 697                 if (WARN_ON(wdev->conn))
 698                         return -EINPROGRESS;
 699
 700                 wdev->conn = kzalloc(sizeof(*wdev->conn), GFP_KERNEL);
 701                 if (!wdev->conn)
 702                         return -ENOMEM;
 703
 704                 /*
 705                  * Copy all parameters, and treat explicitly IEs, BSSID, SSID.
 706                  */
 707                 memcpy(&wdev->conn->params, connect, sizeof(*connect));
 708                 if (connect->bssid) {
 709                         wdev->conn->params.bssid = wdev->conn->bssid;
 710                         memcpy(wdev->conn->bssid, connect->bssid, ETH_ALEN);
 711                 }
 712
 713                 if (connect->ie) {
 714                         wdev->conn->ie = kmemdup(connect->ie, connect->ie_len,
 715                                                 GFP_KERNEL);
 716                         wdev->conn->params.ie = wdev->conn->ie;
 717                         if (!wdev->conn->ie) {
 718                                 kfree(wdev->conn);
 719                                 wdev->conn = NULL;
 720                                 return -ENOMEM;
 721                         }
 722                 }
 723
 724                 if (connect->auth_type == NL80211_AUTHTYPE_AUTOMATIC) {
 725                         wdev->conn->auto_auth = true;
 726                         /* start with open system ... should mostly work */
 727                         wdev->conn->params.auth_type =
 728                                 NL80211_AUTHTYPE_OPEN_SYSTEM;
 729                 } else {
 730                         wdev->conn->auto_auth = false;
 731                 }
 732
 733                 memcpy(wdev->ssid, connect->ssid, connect->ssid_len);
 734                 wdev->ssid_len = connect->ssid_len;
 735                 wdev->conn->params.ssid = wdev->ssid;
 736                 wdev->conn->params.ssid_len = connect->ssid_len;
 737
 738                 /* don't care about result -- but fill bssid & channel */
 739                 if (!wdev->conn->params.bssid || !wdev->conn->params.channel)
 740                         cfg80211_get_conn_bss(wdev);
 741
 742                 wdev->sme_state = CFG80211_SME_CONNECTING;
 743                 wdev->connect_keys = connkeys;
 744
 745                 /* we're good if we have both BSSID and channel */
 746                 if (wdev->conn->params.bssid && wdev->conn->params.channel) {
 747                         wdev->conn->state = CFG80211_CONN_AUTHENTICATE_NEXT;
 748                         err = cfg80211_conn_do_work(wdev);
 749                 } else {
 750                         /* otherwise we'll need to scan for the AP first */
 751                         err = cfg80211_conn_scan(wdev);
 752                         /*
 753                          * If we can't scan right now, then we need to scan again
 754                          * after the current scan finished, since the parameters
 755                          * changed (unless we find a good AP anyway).
 756                          */
 757                         if (err == -EBUSY) {
 758                                 err = 0;
 759                                 wdev->conn->state = CFG80211_CONN_SCAN_AGAIN;
 760                         }
 761                 }
 762                 if (err) {
 763                         kfree(wdev->conn);
 764                         wdev->conn = NULL;
 765                         wdev->sme_state = CFG80211_SME_IDLE;
 766                         wdev->connect_keys = NULL;
 767                         wdev->ssid_len = 0;
 768                 }
 769
 770                 return err;
 771         } else {
 772                 wdev->sme_state = CFG80211_SME_CONNECTING;
 773                 wdev->connect_keys = connkeys;
 774                 err = rdev->ops->connect(&rdev->wiphy, dev, connect);
 775                 if (err) {
 776                         wdev->connect_keys = NULL;
 777                         wdev->sme_state = CFG80211_SME_IDLE;
 778                         return err;
 779                 }
 780
 781                 memcpy(wdev->ssid, connect->ssid, connect->ssid_len);
 782                 wdev->ssid_len = connect->ssid_len;
 783
 784                 return 0;
 785         }
 786 }
 787
 788 int cfg80211_connect(struct cfg80211_registered_device *rdev,
 789                      struct net_device *dev,
 790                      struct cfg80211_connect_params *connect,
 791                      struct cfg80211_cached_keys *connkeys)
 792 {
 793         int err;
 794
 795         mutex_lock(&rdev->devlist_mtx);
 796         wdev_lock(dev->ieee80211_ptr);
 797         err = __cfg80211_connect(rdev, dev, connect, connkeys);
 798         wdev_unlock(dev->ieee80211_ptr);
 799         mutex_unlock(&rdev->devlist_mtx);
 800
 801         return err;
 802 }
 803
 804 int __cfg80211_disconnect(struct cfg80211_registered_device *rdev,
 805                           struct net_device *dev, u16 reason, bool wextev)
 806 {
 807         struct wireless_dev *wdev = dev->ieee80211_ptr;
 808         int err;
 809
 810         ASSERT_WDEV_LOCK(wdev);
 811
 812         if (wdev->sme_state == CFG80211_SME_IDLE)
 813                 return -EINVAL;
 814
 815         kfree(wdev->connect_keys);
 816         wdev->connect_keys = NULL;
 817
 818         if (!rdev->ops->disconnect) {
 819                 if (!rdev->ops->deauth)
 820                         return -EOPNOTSUPP;
 821
 822                 /* was it connected by userspace SME? */
 823                 if (!wdev->conn) {
 824                         cfg80211_mlme_down(rdev, dev);
 825                         return 0;
 826                 }
 827
 828                 if (wdev->sme_state == CFG80211_SME_CONNECTING &&
 829                     (wdev->conn->state == CFG80211_CONN_SCANNING ||
 830                      wdev->conn->state == CFG80211_CONN_SCAN_AGAIN)) {
 831                         wdev->sme_state = CFG80211_SME_IDLE;
 832                         kfree(wdev->conn);
 833                         wdev->conn = NULL;
 834                         wdev->ssid_len = 0;
 835                         return 0;
 836                 }
 837
 838                 /* wdev->conn->params.bssid must be set if > SCANNING */
 839                 err = __cfg80211_mlme_deauth(rdev, dev,
 840                                              wdev->conn->params.bssid,
 841                                              NULL, 0, reason);
 842                 if (err)
 843                         return err;
 844         } else {
 845                 err = rdev->ops->disconnect(&rdev->wiphy, dev, reason);
 846                 if (err)
 847                         return err;
 848         }
 849
 850         if (wdev->sme_state == CFG80211_SME_CONNECTED)
 851                 __cfg80211_disconnected(dev, NULL, 0, 0, false);
 852         else if (wdev->sme_state == CFG80211_SME_CONNECTING)
 853                 __cfg80211_connect_result(dev, NULL, NULL, 0, NULL, 0,
 854                                           WLAN_STATUS_UNSPECIFIED_FAILURE,
 855                                           wextev, NULL);
 856
 857         return 0;
 858 }
 859
 860 int cfg80211_disconnect(struct cfg80211_registered_device *rdev,
 861                         struct net_device *dev,
 862                         u16 reason, bool wextev)
 863 {
 864         int err;
 865
 866         wdev_lock(dev->ieee80211_ptr);
 867         err = __cfg80211_disconnect(rdev, dev, reason, wextev);
 868         wdev_unlock(dev->ieee80211_ptr);
 869
 870         return err;
 871 }
 872
 873 void cfg80211_sme_disassoc(struct net_device *dev, int idx)
 874 {
 875         struct wireless_dev *wdev = dev->ieee80211_ptr;
 876         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 877         u8 bssid[ETH_ALEN];
 878
 879         ASSERT_WDEV_LOCK(wdev);
 880
 881         if (!wdev->conn)
 882                 return;
 883
 884         if (wdev->conn->state == CFG80211_CONN_IDLE)
 885                 return;
 886
 887         /*
 888          * Ok, so the association was made by this SME -- we don't
 889          * want it any more so deauthenticate too.
 890          */
 891
 892         if (!wdev->auth_bsses[idx])
 893                 return;
 894
 895         memcpy(bssid, wdev->auth_bsses[idx]->pub.bssid, ETH_ALEN);
 896         if (__cfg80211_mlme_deauth(rdev, dev, bssid,
 897                                    NULL, 0, WLAN_REASON_DEAUTH_LEAVING)) {
 898                 /* whatever -- assume gone anyway */
 899                 cfg80211_unhold_bss(wdev->auth_bsses[idx]);
 900                 cfg80211_put_bss(&wdev->auth_bsses[idx]->pub);
 901                 wdev->auth_bsses[idx] = NULL;
 902         }
 903 }