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