net/wireless/sme.c

   1 /*
   2  * SME code for cfg80211's connect emulation.
   3  *
   4  * Copyright 2009       Johannes Berg <johannes@sipsolutions.net>
   5  * Copyright (C) 2009   Intel Corporation. All rights reserved.
   6  */
   7
   8 #include <linux/etherdevice.h>
   9 #include <linux/if_arp.h>
  10 #include <linux/slab.h>
  11 #include <linux/workqueue.h>
  12 #include <linux/wireless.h>
  13 #include <linux/export.h>
  14 #include <net/iw_handler.h>
  15 #include <net/cfg80211.h>
  16 #include <net/rtnetlink.h>
  17 #include "nl80211.h"
  18 #include "reg.h"
  19
  20 struct cfg80211_conn {
  21         struct cfg80211_connect_params params;
  22         /* these are sub-states of the _CONNECTING sme_state */
  23         enum {
  24                 CFG80211_CONN_IDLE,
  25                 CFG80211_CONN_SCANNING,
  26                 CFG80211_CONN_SCAN_AGAIN,
  27                 CFG80211_CONN_AUTHENTICATE_NEXT,
  28                 CFG80211_CONN_AUTHENTICATING,
  29                 CFG80211_CONN_ASSOCIATE_NEXT,
  30                 CFG80211_CONN_ASSOCIATING,
  31                 CFG80211_CONN_DEAUTH_ASSOC_FAIL,
  32         } state;
  33         u8 bssid[ETH_ALEN], prev_bssid[ETH_ALEN];
  34         u8 *ie;
  35         size_t ie_len;
  36         bool auto_auth, prev_bssid_valid;
  37 };
  38
  39 static bool cfg80211_is_all_idle(void)
  40 {
  41         struct cfg80211_registered_device *rdev;
  42         struct wireless_dev *wdev;
  43         bool is_all_idle = true;
  44
  45         mutex_lock(&cfg80211_mutex);
  46
  47         /*
  48          * All devices must be idle as otherwise if you are actively
  49          * scanning some new beacon hints could be learned and would
  50          * count as new regulatory hints.
  51          */
  52         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
  53                 cfg80211_lock_rdev(rdev);
  54                 list_for_each_entry(wdev, &rdev->netdev_list, list) {
  55                         wdev_lock(wdev);
  56                         if (wdev->sme_state != CFG80211_SME_IDLE)
  57                                 is_all_idle = false;
  58                         wdev_unlock(wdev);
  59                 }
  60                 cfg80211_unlock_rdev(rdev);
  61         }
  62
  63         mutex_unlock(&cfg80211_mutex);
  64
  65         return is_all_idle;
  66 }
  67
  68 static void disconnect_work(struct work_struct *work)
  69 {
  70         if (!cfg80211_is_all_idle())
  71                 return;
  72
  73         regulatory_hint_disconnect();
  74 }
  75
  76 static DECLARE_WORK(cfg80211_disconnect_work, disconnect_work);
  77
  78 static int cfg80211_conn_scan(struct wireless_dev *wdev)
  79 {
  80         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
  81         struct cfg80211_scan_request *request;
  82         int n_channels, err;
  83
  84         ASSERT_RTNL();
  85         ASSERT_RDEV_LOCK(rdev);
  86         ASSERT_WDEV_LOCK(wdev);
  87
  88         if (rdev->scan_req)
  89                 return -EBUSY;
  90
  91         if (wdev->conn->params.channel) {
  92                 n_channels = 1;
  93         } else {
  94                 enum ieee80211_band band;
  95                 n_channels = 0;
  96
  97                 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
  98                         if (!wdev->wiphy->bands[band])
  99                                 continue;
 100                         n_channels += wdev->wiphy->bands[band]->n_channels;
 101                 }
 102         }
 103         request = kzalloc(sizeof(*request) + sizeof(request->ssids[0]) +
 104                           sizeof(request->channels[0]) * n_channels,
 105                           GFP_KERNEL);
 106         if (!request)
 107                 return -ENOMEM;
 108
 109         if (wdev->conn->params.channel)
 110                 request->channels[0] = wdev->conn->params.channel;
 111         else {
 112                 int i = 0, j;
 113                 enum ieee80211_band band;
 114                 struct ieee80211_supported_band *bands;
 115                 struct ieee80211_channel *channel;
 116
 117                 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 118                         bands = wdev->wiphy->bands[band];
 119                         if (!bands)
 120                                 continue;
 121                         for (j = 0; j < bands->n_channels; j++) {
 122                                 channel = &bands->channels[j];
 123                                 if (channel->flags & IEEE80211_CHAN_DISABLED)
 124                                         continue;
 125                                 request->channels[i++] = channel;
 126                         }
 127                         request->rates[band] = (1 << bands->n_bitrates) - 1;
 128                 }
 129                 n_channels = i;
 130         }
 131         request->n_channels = n_channels;
 132         request->ssids = (void *)&request->channels[n_channels];
 133         request->n_ssids = 1;
 134
 135         memcpy(request->ssids[0].ssid, wdev->conn->params.ssid,
 136                 wdev->conn->params.ssid_len);
 137         request->ssids[0].ssid_len = wdev->conn->params.ssid_len;
 138
 139         request->dev = wdev->netdev;
 140         request->wiphy = &rdev->wiphy;
 141
 142         rdev->scan_req = request;
 143
 144         err = rdev->ops->scan(wdev->wiphy, wdev->netdev, request);
 145         if (!err) {
 146                 wdev->conn->state = CFG80211_CONN_SCANNING;
 147                 nl80211_send_scan_start(rdev, wdev->netdev);
 148                 dev_hold(wdev->netdev);
 149         } else {
 150                 rdev->scan_req = NULL;
 151                 kfree(request);
 152         }
 153         return err;
 154 }
 155
 156 static int cfg80211_conn_do_work(struct wireless_dev *wdev)
 157 {
 158         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 159         struct cfg80211_connect_params *params;
 160         const u8 *prev_bssid = NULL;
 161         int err;
 162
 163         ASSERT_WDEV_LOCK(wdev);
 164
 165         if (!wdev->conn)
 166                 return 0;
 167
 168         params = &wdev->conn->params;
 169
 170         switch (wdev->conn->state) {
 171         case CFG80211_CONN_SCAN_AGAIN:
 172                 return cfg80211_conn_scan(wdev);
 173         case CFG80211_CONN_AUTHENTICATE_NEXT:
 174                 BUG_ON(!rdev->ops->auth);
 175                 wdev->conn->state = CFG80211_CONN_AUTHENTICATING;
 176                 return __cfg80211_mlme_auth(rdev, wdev->netdev,
 177                                             params->channel, params->auth_type,
 178                                             params->bssid,
 179                                             params->ssid, params->ssid_len,
 180                                             NULL, 0,
 181                                             params->key, params->key_len,
 182                                             params->key_idx, false);
 183         case CFG80211_CONN_ASSOCIATE_NEXT:
 184                 BUG_ON(!rdev->ops->assoc);
 185                 wdev->conn->state = CFG80211_CONN_ASSOCIATING;
 186                 if (wdev->conn->prev_bssid_valid)
 187                         prev_bssid = wdev->conn->prev_bssid;
 188                 err = __cfg80211_mlme_assoc(rdev, wdev->netdev,
 189                                             params->channel, params->bssid,
 190                                             prev_bssid,
 191                                             params->ssid, params->ssid_len,
 192                                             params->ie, params->ie_len,
 193                                             false, &params->crypto,
 194                                             params->flags, &params->ht_capa,
 195                                             &params->ht_capa_mask);
 196                 if (err)
 197                         __cfg80211_mlme_deauth(rdev, wdev->netdev, params->bssid,
 198                                                NULL, 0,
 199                                                WLAN_REASON_DEAUTH_LEAVING,
 200                                                false);
 201                 return err;
 202         case CFG80211_CONN_DEAUTH_ASSOC_FAIL:
 203                 __cfg80211_mlme_deauth(rdev, wdev->netdev, params->bssid,
 204                                        NULL, 0,
 205                                        WLAN_REASON_DEAUTH_LEAVING, false);
 206                 /* return an error so that we call __cfg80211_connect_result() */
 207                 return -EINVAL;
 208         default:
 209                 return 0;
 210         }
 211 }
 212
 213 void cfg80211_conn_work(struct work_struct *work)
 214 {
 215         struct cfg80211_registered_device *rdev =
 216                 container_of(work, struct cfg80211_registered_device, conn_work);
 217         struct wireless_dev *wdev;
 218         u8 bssid_buf[ETH_ALEN], *bssid = NULL;
 219
 220         rtnl_lock();
 221         cfg80211_lock_rdev(rdev);
 222         mutex_lock(&rdev->devlist_mtx);
 223
 224         list_for_each_entry(wdev, &rdev->netdev_list, list) {
 225                 wdev_lock(wdev);
 226                 if (!netif_running(wdev->netdev)) {
 227                         wdev_unlock(wdev);
 228                         continue;
 229                 }
 230                 if (wdev->sme_state != CFG80211_SME_CONNECTING) {
 231                         wdev_unlock(wdev);
 232                         continue;
 233                 }
 234                 if (wdev->conn->params.bssid) {
 235                         memcpy(bssid_buf, wdev->conn->params.bssid, ETH_ALEN);
 236                         bssid = bssid_buf;
 237                 }
 238                 if (cfg80211_conn_do_work(wdev))
 239                         __cfg80211_connect_result(
 240                                         wdev->netdev, bssid,
 241                                         NULL, 0, NULL, 0,
 242                                         WLAN_STATUS_UNSPECIFIED_FAILURE,
 243                                         false, NULL);
 244                 wdev_unlock(wdev);
 245         }
 246
 247         mutex_unlock(&rdev->devlist_mtx);
 248         cfg80211_unlock_rdev(rdev);
 249         rtnl_unlock();
 250 }
 251
 252 static struct cfg80211_bss *cfg80211_get_conn_bss(struct wireless_dev *wdev)
 253 {
 254         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 255         struct cfg80211_bss *bss;
 256         u16 capa = WLAN_CAPABILITY_ESS;
 257
 258         ASSERT_WDEV_LOCK(wdev);
 259
 260         if (wdev->conn->params.privacy)
 261                 capa |= WLAN_CAPABILITY_PRIVACY;
 262
 263         bss = cfg80211_get_bss(wdev->wiphy, wdev->conn->params.channel,
 264                                wdev->conn->params.bssid,
 265                                wdev->conn->params.ssid,
 266                                wdev->conn->params.ssid_len,
 267                                WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_PRIVACY,
 268                                capa);
 269         if (!bss)
 270                 return NULL;
 271
 272         memcpy(wdev->conn->bssid, bss->bssid, ETH_ALEN);
 273         wdev->conn->params.bssid = wdev->conn->bssid;
 274         wdev->conn->params.channel = bss->channel;
 275         wdev->conn->state = CFG80211_CONN_AUTHENTICATE_NEXT;
 276         schedule_work(&rdev->conn_work);
 277
 278         return bss;
 279 }
 280
 281 static void __cfg80211_sme_scan_done(struct net_device *dev)
 282 {
 283         struct wireless_dev *wdev = dev->ieee80211_ptr;
 284         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 285         struct cfg80211_bss *bss;
 286
 287         ASSERT_WDEV_LOCK(wdev);
 288
 289         if (wdev->sme_state != CFG80211_SME_CONNECTING)
 290                 return;
 291
 292         if (!wdev->conn)
 293                 return;
 294
 295         if (wdev->conn->state != CFG80211_CONN_SCANNING &&
 296             wdev->conn->state != CFG80211_CONN_SCAN_AGAIN)
 297                 return;
 298
 299         bss = cfg80211_get_conn_bss(wdev);
 300         if (bss) {
 301                 cfg80211_put_bss(bss);
 302         } else {
 303                 /* not found */
 304                 if (wdev->conn->state == CFG80211_CONN_SCAN_AGAIN)
 305                         schedule_work(&rdev->conn_work);
 306                 else
 307                         __cfg80211_connect_result(
 308                                         wdev->netdev,
 309                                         wdev->conn->params.bssid,
 310                                         NULL, 0, NULL, 0,
 311                                         WLAN_STATUS_UNSPECIFIED_FAILURE,
 312                                         false, NULL);
 313         }
 314 }
 315
 316 void cfg80211_sme_scan_done(struct net_device *dev)
 317 {
 318         struct wireless_dev *wdev = dev->ieee80211_ptr;
 319
 320         mutex_lock(&wiphy_to_dev(wdev->wiphy)->devlist_mtx);
 321         wdev_lock(wdev);
 322         __cfg80211_sme_scan_done(dev);
 323         wdev_unlock(wdev);
 324         mutex_unlock(&wiphy_to_dev(wdev->wiphy)->devlist_mtx);
 325 }
 326
 327 void cfg80211_sme_rx_auth(struct net_device *dev,
 328                           const u8 *buf, size_t len)
 329 {
 330         struct wireless_dev *wdev = dev->ieee80211_ptr;
 331         struct wiphy *wiphy = wdev->wiphy;
 332         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 333         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)buf;
 334         u16 status_code = le16_to_cpu(mgmt->u.auth.status_code);
 335
 336         ASSERT_WDEV_LOCK(wdev);
 337
 338         /* should only RX auth frames when connecting */
 339         if (wdev->sme_state != CFG80211_SME_CONNECTING)
 340                 return;
 341
 342         if (WARN_ON(!wdev->conn))
 343                 return;
 344
 345         if (status_code == WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG &&
 346             wdev->conn->auto_auth &&
 347             wdev->conn->params.auth_type != NL80211_AUTHTYPE_NETWORK_EAP) {
 348                 /* select automatically between only open, shared, leap */
 349                 switch (wdev->conn->params.auth_type) {
 350                 case NL80211_AUTHTYPE_OPEN_SYSTEM:
 351                         if (wdev->connect_keys)
 352                                 wdev->conn->params.auth_type =
 353                                         NL80211_AUTHTYPE_SHARED_KEY;
 354                         else
 355                                 wdev->conn->params.auth_type =
 356                                         NL80211_AUTHTYPE_NETWORK_EAP;
 357                         break;
 358                 case NL80211_AUTHTYPE_SHARED_KEY:
 359                         wdev->conn->params.auth_type =
 360                                 NL80211_AUTHTYPE_NETWORK_EAP;
 361                         break;
 362                 default:
 363                         /* huh? */
 364                         wdev->conn->params.auth_type =
 365                                 NL80211_AUTHTYPE_OPEN_SYSTEM;
 366                         break;
 367                 }
 368                 wdev->conn->state = CFG80211_CONN_AUTHENTICATE_NEXT;
 369                 schedule_work(&rdev->conn_work);
 370         } else if (status_code != WLAN_STATUS_SUCCESS) {
 371                 __cfg80211_connect_result(dev, mgmt->bssid, NULL, 0, NULL, 0,
 372                                           status_code, false, NULL);
 373         } else if (wdev->sme_state == CFG80211_SME_CONNECTING &&
 374                  wdev->conn->state == CFG80211_CONN_AUTHENTICATING) {
 375                 wdev->conn->state = CFG80211_CONN_ASSOCIATE_NEXT;
 376                 schedule_work(&rdev->conn_work);
 377         }
 378 }
 379
 380 bool cfg80211_sme_failed_reassoc(struct wireless_dev *wdev)
 381 {
 382         struct wiphy *wiphy = wdev->wiphy;
 383         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 384
 385         if (WARN_ON(!wdev->conn))
 386                 return false;
 387
 388         if (!wdev->conn->prev_bssid_valid)
 389                 return false;
 390
 391         /*
 392          * Some stupid APs don't accept reassoc, so we
 393          * need to fall back to trying regular assoc.
 394          */
 395         wdev->conn->prev_bssid_valid = false;
 396         wdev->conn->state = CFG80211_CONN_ASSOCIATE_NEXT;
 397         schedule_work(&rdev->conn_work);
 398
 399         return true;
 400 }
 401
 402 void cfg80211_sme_failed_assoc(struct wireless_dev *wdev)
 403 {
 404         struct wiphy *wiphy = wdev->wiphy;
 405         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 406
 407         wdev->conn->state = CFG80211_CONN_DEAUTH_ASSOC_FAIL;
 408         schedule_work(&rdev->conn_work);
 409 }
 410
 411 void __cfg80211_connect_result(struct net_device *dev, const u8 *bssid,
 412                                const u8 *req_ie, size_t req_ie_len,
 413                                const u8 *resp_ie, size_t resp_ie_len,
 414                                u16 status, bool wextev,
 415                                struct cfg80211_bss *bss)
 416 {
 417         struct wireless_dev *wdev = dev->ieee80211_ptr;
 418         u8 *country_ie;
 419 #ifdef CONFIG_CFG80211_WEXT
 420         union iwreq_data wrqu;
 421 #endif
 422
 423         ASSERT_WDEV_LOCK(wdev);
 424
 425         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION &&
 426                     wdev->iftype != NL80211_IFTYPE_P2P_CLIENT))
 427                 return;
 428
 429         if (wdev->sme_state != CFG80211_SME_CONNECTING)
 430                 return;
 431
 432         nl80211_send_connect_result(wiphy_to_dev(wdev->wiphy), dev,
 433                                     bssid, req_ie, req_ie_len,
 434                                     resp_ie, resp_ie_len,
 435                                     status, GFP_KERNEL);
 436
 437 #ifdef CONFIG_CFG80211_WEXT
 438         if (wextev) {
 439                 if (req_ie && status == WLAN_STATUS_SUCCESS) {
 440                         memset(&wrqu, 0, sizeof(wrqu));
 441                         wrqu.data.length = req_ie_len;
 442                         wireless_send_event(dev, IWEVASSOCREQIE, &wrqu, req_ie);
 443                 }
 444
 445                 if (resp_ie && status == WLAN_STATUS_SUCCESS) {
 446                         memset(&wrqu, 0, sizeof(wrqu));
 447                         wrqu.data.length = resp_ie_len;
 448                         wireless_send_event(dev, IWEVASSOCRESPIE, &wrqu, resp_ie);
 449                 }
 450
 451                 memset(&wrqu, 0, sizeof(wrqu));
 452                 wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 453                 if (bssid && status == WLAN_STATUS_SUCCESS) {
 454                         memcpy(wrqu.ap_addr.sa_data, bssid, ETH_ALEN);
 455                         memcpy(wdev->wext.prev_bssid, bssid, ETH_ALEN);
 456                         wdev->wext.prev_bssid_valid = true;
 457                 }
 458                 wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL);
 459         }
 460 #endif
 461
 462         if (wdev->current_bss) {
 463                 cfg80211_unhold_bss(wdev->current_bss);
 464                 cfg80211_put_bss(&wdev->current_bss->pub);
 465                 wdev->current_bss = NULL;
 466         }
 467
 468         if (wdev->conn)
 469                 wdev->conn->state = CFG80211_CONN_IDLE;
 470
 471         if (status != WLAN_STATUS_SUCCESS) {
 472                 wdev->sme_state = CFG80211_SME_IDLE;
 473                 if (wdev->conn)
 474                         kfree(wdev->conn->ie);
 475                 kfree(wdev->conn);
 476                 wdev->conn = NULL;
 477                 kfree(wdev->connect_keys);
 478                 wdev->connect_keys = NULL;
 479                 wdev->ssid_len = 0;
 480                 return;
 481         }
 482
 483         if (!bss)
 484                 bss = cfg80211_get_bss(wdev->wiphy,
 485                                        wdev->conn ? wdev->conn->params.channel :
 486                                        NULL,
 487                                        bssid,
 488                                        wdev->ssid, wdev->ssid_len,
 489                                        WLAN_CAPABILITY_ESS,
 490                                        WLAN_CAPABILITY_ESS);
 491
 492         if (WARN_ON(!bss))
 493                 return;
 494
 495         cfg80211_hold_bss(bss_from_pub(bss));
 496         wdev->current_bss = bss_from_pub(bss);
 497
 498         wdev->sme_state = CFG80211_SME_CONNECTED;
 499         cfg80211_upload_connect_keys(wdev);
 500
 501         country_ie = (u8 *) ieee80211_bss_get_ie(bss, WLAN_EID_COUNTRY);
 502
 503         if (!country_ie)
 504                 return;
 505
 506         /*
 507          * ieee80211_bss_get_ie() ensures we can access:
 508          * - country_ie + 2, the start of the country ie data, and
 509          * - and country_ie[1] which is the IE length
 510          */
 511         regulatory_hint_11d(wdev->wiphy,
 512                             bss->channel->band,
 513                             country_ie + 2,
 514                             country_ie[1]);
 515 }
 516
 517 void cfg80211_connect_result(struct net_device *dev, const u8 *bssid,
 518                              const u8 *req_ie, size_t req_ie_len,
 519                              const u8 *resp_ie, size_t resp_ie_len,
 520                              u16 status, gfp_t gfp)
 521 {
 522         struct wireless_dev *wdev = dev->ieee80211_ptr;
 523         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 524         struct cfg80211_event *ev;
 525         unsigned long flags;
 526
 527         CFG80211_DEV_WARN_ON(wdev->sme_state != CFG80211_SME_CONNECTING);
 528
 529         ev = kzalloc(sizeof(*ev) + req_ie_len + resp_ie_len, gfp);
 530         if (!ev)
 531                 return;
 532
 533         ev->type = EVENT_CONNECT_RESULT;
 534         if (bssid)
 535                 memcpy(ev->cr.bssid, bssid, ETH_ALEN);
 536         if (req_ie_len) {
 537                 ev->cr.req_ie = ((u8 *)ev) + sizeof(*ev);
 538                 ev->cr.req_ie_len = req_ie_len;
 539                 memcpy((void *)ev->cr.req_ie, req_ie, req_ie_len);
 540         }
 541         if (resp_ie_len) {
 542                 ev->cr.resp_ie = ((u8 *)ev) + sizeof(*ev) + req_ie_len;
 543                 ev->cr.resp_ie_len = resp_ie_len;
 544                 memcpy((void *)ev->cr.resp_ie, resp_ie, resp_ie_len);
 545         }
 546         ev->cr.status = status;
 547
 548         spin_lock_irqsave(&wdev->event_lock, flags);
 549         list_add_tail(&ev->list, &wdev->event_list);
 550         spin_unlock_irqrestore(&wdev->event_lock, flags);
 551         queue_work(cfg80211_wq, &rdev->event_work);
 552 }
 553 EXPORT_SYMBOL(cfg80211_connect_result);
 554
 555 void __cfg80211_roamed(struct wireless_dev *wdev,
 556                        struct cfg80211_bss *bss,
 557                        const u8 *req_ie, size_t req_ie_len,
 558                        const u8 *resp_ie, size_t resp_ie_len)
 559 {
 560 #ifdef CONFIG_CFG80211_WEXT
 561         union iwreq_data wrqu;
 562 #endif
 563         ASSERT_WDEV_LOCK(wdev);
 564
 565         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION &&
 566                     wdev->iftype != NL80211_IFTYPE_P2P_CLIENT))
 567                 goto out;
 568
 569         if (wdev->sme_state != CFG80211_SME_CONNECTED)
 570                 goto out;
 571
 572         /* internal error -- how did we get to CONNECTED w/o BSS? */
 573         if (WARN_ON(!wdev->current_bss)) {
 574                 goto out;
 575         }
 576
 577         cfg80211_unhold_bss(wdev->current_bss);
 578         cfg80211_put_bss(&wdev->current_bss->pub);
 579         wdev->current_bss = NULL;
 580
 581         cfg80211_hold_bss(bss_from_pub(bss));
 582         wdev->current_bss = bss_from_pub(bss);
 583
 584         nl80211_send_roamed(wiphy_to_dev(wdev->wiphy), wdev->netdev, bss->bssid,
 585                             req_ie, req_ie_len, resp_ie, resp_ie_len,
 586                             GFP_KERNEL);
 587
 588 #ifdef CONFIG_CFG80211_WEXT
 589         if (req_ie) {
 590                 memset(&wrqu, 0, sizeof(wrqu));
 591                 wrqu.data.length = req_ie_len;
 592                 wireless_send_event(wdev->netdev, IWEVASSOCREQIE,
 593                                     &wrqu, req_ie);
 594         }
 595
 596         if (resp_ie) {
 597                 memset(&wrqu, 0, sizeof(wrqu));
 598                 wrqu.data.length = resp_ie_len;
 599                 wireless_send_event(wdev->netdev, IWEVASSOCRESPIE,
 600                                     &wrqu, resp_ie);
 601         }
 602
 603         memset(&wrqu, 0, sizeof(wrqu));
 604         wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 605         memcpy(wrqu.ap_addr.sa_data, bss->bssid, ETH_ALEN);
 606         memcpy(wdev->wext.prev_bssid, bss->bssid, ETH_ALEN);
 607         wdev->wext.prev_bssid_valid = true;
 608         wireless_send_event(wdev->netdev, SIOCGIWAP, &wrqu, NULL);
 609 #endif
 610
 611         return;
 612 out:
 613         cfg80211_put_bss(bss);
 614 }
 615
 616 void cfg80211_roamed(struct net_device *dev,
 617                      struct ieee80211_channel *channel,
 618                      const u8 *bssid,
 619                      const u8 *req_ie, size_t req_ie_len,
 620                      const u8 *resp_ie, size_t resp_ie_len, gfp_t gfp)
 621 {
 622         struct wireless_dev *wdev = dev->ieee80211_ptr;
 623         struct cfg80211_bss *bss;
 624
 625         CFG80211_DEV_WARN_ON(wdev->sme_state != CFG80211_SME_CONNECTED);
 626
 627         bss = cfg80211_get_bss(wdev->wiphy, channel, bssid, wdev->ssid,
 628                                wdev->ssid_len, WLAN_CAPABILITY_ESS,
 629                                WLAN_CAPABILITY_ESS);
 630         if (WARN_ON(!bss))
 631                 return;
 632
 633         cfg80211_roamed_bss(dev, bss, req_ie, req_ie_len, resp_ie,
 634                             resp_ie_len, gfp);
 635 }
 636 EXPORT_SYMBOL(cfg80211_roamed);
 637
 638 void cfg80211_roamed_bss(struct net_device *dev,
 639                          struct cfg80211_bss *bss, const u8 *req_ie,
 640                          size_t req_ie_len, const u8 *resp_ie,
 641                          size_t resp_ie_len, gfp_t gfp)
 642 {
 643         struct wireless_dev *wdev = dev->ieee80211_ptr;
 644         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 645         struct cfg80211_event *ev;
 646         unsigned long flags;
 647
 648         CFG80211_DEV_WARN_ON(wdev->sme_state != CFG80211_SME_CONNECTED);
 649
 650         if (WARN_ON(!bss))
 651                 return;
 652
 653         ev = kzalloc(sizeof(*ev) + req_ie_len + resp_ie_len, gfp);
 654         if (!ev) {
 655                 cfg80211_put_bss(bss);
 656                 return;
 657         }
 658
 659         ev->type = EVENT_ROAMED;
 660         ev->rm.req_ie = ((u8 *)ev) + sizeof(*ev);
 661         ev->rm.req_ie_len = req_ie_len;
 662         memcpy((void *)ev->rm.req_ie, req_ie, req_ie_len);
 663         ev->rm.resp_ie = ((u8 *)ev) + sizeof(*ev) + req_ie_len;
 664         ev->rm.resp_ie_len = resp_ie_len;
 665         memcpy((void *)ev->rm.resp_ie, resp_ie, resp_ie_len);
 666         ev->rm.bss = bss;
 667
 668         spin_lock_irqsave(&wdev->event_lock, flags);
 669         list_add_tail(&ev->list, &wdev->event_list);
 670         spin_unlock_irqrestore(&wdev->event_lock, flags);
 671         queue_work(cfg80211_wq, &rdev->event_work);
 672 }
 673 EXPORT_SYMBOL(cfg80211_roamed_bss);
 674
 675 void __cfg80211_disconnected(struct net_device *dev, const u8 *ie,
 676                              size_t ie_len, u16 reason, bool from_ap)
 677 {
 678         struct wireless_dev *wdev = dev->ieee80211_ptr;
 679         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 680         int i;
 681 #ifdef CONFIG_CFG80211_WEXT
 682         union iwreq_data wrqu;
 683 #endif
 684
 685         ASSERT_WDEV_LOCK(wdev);
 686
 687         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION &&
 688                     wdev->iftype != NL80211_IFTYPE_P2P_CLIENT))
 689                 return;
 690
 691         if (wdev->sme_state != CFG80211_SME_CONNECTED)
 692                 return;
 693
 694         if (wdev->current_bss) {
 695                 cfg80211_unhold_bss(wdev->current_bss);
 696                 cfg80211_put_bss(&wdev->current_bss->pub);
 697         }
 698
 699         wdev->current_bss = NULL;
 700         wdev->sme_state = CFG80211_SME_IDLE;
 701         wdev->ssid_len = 0;
 702
 703         if (wdev->conn) {
 704                 const u8 *bssid;
 705                 int ret;
 706
 707                 kfree(wdev->conn->ie);
 708                 wdev->conn->ie = NULL;
 709                 kfree(wdev->conn);
 710                 wdev->conn = NULL;
 711
 712                 /*
 713                  * If this disconnect was due to a disassoc, we
 714                  * we might still have an auth BSS around. For
 715                  * the userspace SME that's currently expected,
 716                  * but for the kernel SME (nl80211 CONNECT or
 717                  * wireless extensions) we want to clear up all
 718                  * state.
 719                  */
 720                 for (i = 0; i < MAX_AUTH_BSSES; i++) {
 721                         if (!wdev->auth_bsses[i])
 722                                 continue;
 723                         bssid = wdev->auth_bsses[i]->pub.bssid;
 724                         ret = __cfg80211_mlme_deauth(rdev, dev, bssid, NULL, 0,
 725                                                 WLAN_REASON_DEAUTH_LEAVING,
 726                                                 false);
 727                         WARN(ret, "deauth failed: %d\n", ret);
 728                 }
 729         }
 730
 731         nl80211_send_disconnected(rdev, dev, reason, ie, ie_len, from_ap);
 732
 733         /*
 734          * Delete all the keys ... pairwise keys can't really
 735          * exist any more anyway, but default keys might.
 736          */
 737         if (rdev->ops->del_key)
 738                 for (i = 0; i < 6; i++)
 739                         rdev->ops->del_key(wdev->wiphy, dev, i, false, NULL);
 740
 741 #ifdef CONFIG_CFG80211_WEXT
 742         memset(&wrqu, 0, sizeof(wrqu));
 743         wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 744         wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL);
 745         wdev->wext.connect.ssid_len = 0;
 746 #endif
 747
 748         schedule_work(&cfg80211_disconnect_work);
 749 }
 750
 751 void cfg80211_disconnected(struct net_device *dev, u16 reason,
 752                            u8 *ie, size_t ie_len, gfp_t gfp)
 753 {
 754         struct wireless_dev *wdev = dev->ieee80211_ptr;
 755         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 756         struct cfg80211_event *ev;
 757         unsigned long flags;
 758
 759         CFG80211_DEV_WARN_ON(wdev->sme_state != CFG80211_SME_CONNECTED);
 760
 761         ev = kzalloc(sizeof(*ev) + ie_len, gfp);
 762         if (!ev)
 763                 return;
 764
 765         ev->type = EVENT_DISCONNECTED;
 766         ev->dc.ie = ((u8 *)ev) + sizeof(*ev);
 767         ev->dc.ie_len = ie_len;
 768         memcpy((void *)ev->dc.ie, ie, ie_len);
 769         ev->dc.reason = reason;
 770
 771         spin_lock_irqsave(&wdev->event_lock, flags);
 772         list_add_tail(&ev->list, &wdev->event_list);
 773         spin_unlock_irqrestore(&wdev->event_lock, flags);
 774         queue_work(cfg80211_wq, &rdev->event_work);
 775 }
 776 EXPORT_SYMBOL(cfg80211_disconnected);
 777
 778 int __cfg80211_connect(struct cfg80211_registered_device *rdev,
 779                        struct net_device *dev,
 780                        struct cfg80211_connect_params *connect,
 781                        struct cfg80211_cached_keys *connkeys,
 782                        const u8 *prev_bssid)
 783 {
 784         struct wireless_dev *wdev = dev->ieee80211_ptr;
 785         struct cfg80211_bss *bss = NULL;
 786         int err;
 787
 788         ASSERT_WDEV_LOCK(wdev);
 789
 790         if (wdev->sme_state != CFG80211_SME_IDLE)
 791                 return -EALREADY;
 792
 793         if (WARN_ON(wdev->connect_keys)) {
 794                 kfree(wdev->connect_keys);
 795                 wdev->connect_keys = NULL;
 796         }
 797
 798         cfg80211_oper_and_ht_capa(&connect->ht_capa_mask,
 799                                   rdev->wiphy.ht_capa_mod_mask);
 800
 801         if (connkeys && connkeys->def >= 0) {
 802                 int idx;
 803                 u32 cipher;
 804
 805                 idx = connkeys->def;
 806                 cipher = connkeys->params[idx].cipher;
 807                 /* If given a WEP key we may need it for shared key auth */
 808                 if (cipher == WLAN_CIPHER_SUITE_WEP40 ||
 809                     cipher == WLAN_CIPHER_SUITE_WEP104) {
 810                         connect->key_idx = idx;
 811                         connect->key = connkeys->params[idx].key;
 812                         connect->key_len = connkeys->params[idx].key_len;
 813
 814                         /*
 815                          * If ciphers are not set (e.g. when going through
 816                          * iwconfig), we have to set them appropriately here.
 817                          */
 818                         if (connect->crypto.cipher_group == 0)
 819                                 connect->crypto.cipher_group = cipher;
 820
 821                         if (connect->crypto.n_ciphers_pairwise == 0) {
 822                                 connect->crypto.n_ciphers_pairwise = 1;
 823                                 connect->crypto.ciphers_pairwise[0] = cipher;
 824                         }
 825                 }
 826         }
 827
 828         if (!rdev->ops->connect) {
 829                 if (!rdev->ops->auth || !rdev->ops->assoc)
 830                         return -EOPNOTSUPP;
 831
 832                 if (WARN_ON(wdev->conn))
 833                         return -EINPROGRESS;
 834
 835                 wdev->conn = kzalloc(sizeof(*wdev->conn), GFP_KERNEL);
 836                 if (!wdev->conn)
 837                         return -ENOMEM;
 838
 839                 /*
 840                  * Copy all parameters, and treat explicitly IEs, BSSID, SSID.
 841                  */
 842                 memcpy(&wdev->conn->params, connect, sizeof(*connect));
 843                 if (connect->bssid) {
 844                         wdev->conn->params.bssid = wdev->conn->bssid;
 845                         memcpy(wdev->conn->bssid, connect->bssid, ETH_ALEN);
 846                 }
 847
 848                 if (connect->ie) {
 849                         wdev->conn->ie = kmemdup(connect->ie, connect->ie_len,
 850                                                 GFP_KERNEL);
 851                         wdev->conn->params.ie = wdev->conn->ie;
 852                         if (!wdev->conn->ie) {
 853                                 kfree(wdev->conn);
 854                                 wdev->conn = NULL;
 855                                 return -ENOMEM;
 856                         }
 857                 }
 858
 859                 if (connect->auth_type == NL80211_AUTHTYPE_AUTOMATIC) {
 860                         wdev->conn->auto_auth = true;
 861                         /* start with open system ... should mostly work */
 862                         wdev->conn->params.auth_type =
 863                                 NL80211_AUTHTYPE_OPEN_SYSTEM;
 864                 } else {
 865                         wdev->conn->auto_auth = false;
 866                 }
 867
 868                 memcpy(wdev->ssid, connect->ssid, connect->ssid_len);
 869                 wdev->ssid_len = connect->ssid_len;
 870                 wdev->conn->params.ssid = wdev->ssid;
 871                 wdev->conn->params.ssid_len = connect->ssid_len;
 872
 873                 /* see if we have the bss already */
 874                 bss = cfg80211_get_conn_bss(wdev);
 875
 876                 wdev->sme_state = CFG80211_SME_CONNECTING;
 877                 wdev->connect_keys = connkeys;
 878
 879                 if (prev_bssid) {
 880                         memcpy(wdev->conn->prev_bssid, prev_bssid, ETH_ALEN);
 881                         wdev->conn->prev_bssid_valid = true;
 882                 }
 883
 884                 /* we're good if we have a matching bss struct */
 885                 if (bss) {
 886                         wdev->conn->state = CFG80211_CONN_AUTHENTICATE_NEXT;
 887                         err = cfg80211_conn_do_work(wdev);
 888                         cfg80211_put_bss(bss);
 889                 } else {
 890                         /* otherwise we'll need to scan for the AP first */
 891                         err = cfg80211_conn_scan(wdev);
 892                         /*
 893                          * If we can't scan right now, then we need to scan again
 894                          * after the current scan finished, since the parameters
 895                          * changed (unless we find a good AP anyway).
 896                          */
 897                         if (err == -EBUSY) {
 898                                 err = 0;
 899                                 wdev->conn->state = CFG80211_CONN_SCAN_AGAIN;
 900                         }
 901                 }
 902                 if (err) {
 903                         kfree(wdev->conn->ie);
 904                         kfree(wdev->conn);
 905                         wdev->conn = NULL;
 906                         wdev->sme_state = CFG80211_SME_IDLE;
 907                         wdev->connect_keys = NULL;
 908                         wdev->ssid_len = 0;
 909                 }
 910
 911                 return err;
 912         } else {
 913                 wdev->sme_state = CFG80211_SME_CONNECTING;
 914                 wdev->connect_keys = connkeys;
 915                 err = rdev->ops->connect(&rdev->wiphy, dev, connect);
 916                 if (err) {
 917                         wdev->connect_keys = NULL;
 918                         wdev->sme_state = CFG80211_SME_IDLE;
 919                         return err;
 920                 }
 921
 922                 memcpy(wdev->ssid, connect->ssid, connect->ssid_len);
 923                 wdev->ssid_len = connect->ssid_len;
 924
 925                 return 0;
 926         }
 927 }
 928
 929 int cfg80211_connect(struct cfg80211_registered_device *rdev,
 930                      struct net_device *dev,
 931                      struct cfg80211_connect_params *connect,
 932                      struct cfg80211_cached_keys *connkeys)
 933 {
 934         int err;
 935
 936         mutex_lock(&rdev->devlist_mtx);
 937         wdev_lock(dev->ieee80211_ptr);
 938         err = __cfg80211_connect(rdev, dev, connect, connkeys, NULL);
 939         wdev_unlock(dev->ieee80211_ptr);
 940         mutex_unlock(&rdev->devlist_mtx);
 941
 942         return err;
 943 }
 944
 945 int __cfg80211_disconnect(struct cfg80211_registered_device *rdev,
 946                           struct net_device *dev, u16 reason, bool wextev)
 947 {
 948         struct wireless_dev *wdev = dev->ieee80211_ptr;
 949         int err;
 950
 951         ASSERT_WDEV_LOCK(wdev);
 952
 953         if (wdev->sme_state == CFG80211_SME_IDLE)
 954                 return -EINVAL;
 955
 956         kfree(wdev->connect_keys);
 957         wdev->connect_keys = NULL;
 958
 959         if (!rdev->ops->disconnect) {
 960                 if (!rdev->ops->deauth)
 961                         return -EOPNOTSUPP;
 962
 963                 /* was it connected by userspace SME? */
 964                 if (!wdev->conn) {
 965                         cfg80211_mlme_down(rdev, dev);
 966                         return 0;
 967                 }
 968
 969                 if (wdev->sme_state == CFG80211_SME_CONNECTING &&
 970                     (wdev->conn->state == CFG80211_CONN_SCANNING ||
 971                      wdev->conn->state == CFG80211_CONN_SCAN_AGAIN)) {
 972                         wdev->sme_state = CFG80211_SME_IDLE;
 973                         kfree(wdev->conn->ie);
 974                         kfree(wdev->conn);
 975                         wdev->conn = NULL;
 976                         wdev->ssid_len = 0;
 977                         return 0;
 978                 }
 979
 980                 /* wdev->conn->params.bssid must be set if > SCANNING */
 981                 err = __cfg80211_mlme_deauth(rdev, dev,
 982                                              wdev->conn->params.bssid,
 983                                              NULL, 0, reason, false);
 984                 if (err)
 985                         return err;
 986         } else {
 987                 err = rdev->ops->disconnect(&rdev->wiphy, dev, reason);
 988                 if (err)
 989                         return err;
 990         }
 991
 992         if (wdev->sme_state == CFG80211_SME_CONNECTED)
 993                 __cfg80211_disconnected(dev, NULL, 0, 0, false);
 994         else if (wdev->sme_state == CFG80211_SME_CONNECTING)
 995                 __cfg80211_connect_result(dev, NULL, NULL, 0, NULL, 0,
 996                                           WLAN_STATUS_UNSPECIFIED_FAILURE,
 997                                           wextev, NULL);
 998
 999         return 0;
1000 }
1001
1002 int cfg80211_disconnect(struct cfg80211_registered_device *rdev,
1003                         struct net_device *dev,
1004                         u16 reason, bool wextev)
1005 {
1006         int err;
1007
1008         wdev_lock(dev->ieee80211_ptr);
1009         err = __cfg80211_disconnect(rdev, dev, reason, wextev);
1010         wdev_unlock(dev->ieee80211_ptr);
1011
1012         return err;
1013 }
1014
1015 void cfg80211_sme_disassoc(struct net_device *dev, int idx)
1016 {
1017         struct wireless_dev *wdev = dev->ieee80211_ptr;
1018         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
1019         u8 bssid[ETH_ALEN];
1020
1021         ASSERT_WDEV_LOCK(wdev);
1022
1023         if (!wdev->conn)
1024                 return;
1025
1026         if (wdev->conn->state == CFG80211_CONN_IDLE)
1027                 return;
1028
1029         /*
1030          * Ok, so the association was made by this SME -- we don't
1031          * want it any more so deauthenticate too.
1032          */
1033
1034         if (!wdev->auth_bsses[idx])
1035                 return;
1036
1037         memcpy(bssid, wdev->auth_bsses[idx]->pub.bssid, ETH_ALEN);
1038         if (__cfg80211_mlme_deauth(rdev, dev, bssid,
1039                                    NULL, 0, WLAN_REASON_DEAUTH_LEAVING,
1040                                    false)) {
1041                 /* whatever -- assume gone anyway */
1042                 cfg80211_unhold_bss(wdev->auth_bsses[idx]);
1043                 cfg80211_put_bss(&wdev->auth_bsses[idx]->pub);
1044                 wdev->auth_bsses[idx] = NULL;
1045         }
1046 }