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