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