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                             bss->channel->band,
 458                             country_ie + 2,
 459                             country_ie[1]);
 460 }
 461
 462 void cfg80211_connect_result(struct net_device *dev, const u8 *bssid,
 463                              const u8 *req_ie, size_t req_ie_len,
 464                              const u8 *resp_ie, size_t resp_ie_len,
 465                              u16 status, gfp_t gfp)
 466 {
 467         struct wireless_dev *wdev = dev->ieee80211_ptr;
 468         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 469         struct cfg80211_event *ev;
 470         unsigned long flags;
 471
 472         CFG80211_DEV_WARN_ON(wdev->sme_state != CFG80211_SME_CONNECTING);
 473
 474         ev = kzalloc(sizeof(*ev) + req_ie_len + resp_ie_len, gfp);
 475         if (!ev)
 476                 return;
 477
 478         ev->type = EVENT_CONNECT_RESULT;
 479         if (bssid)
 480                 memcpy(ev->cr.bssid, bssid, ETH_ALEN);
 481         ev->cr.req_ie = ((u8 *)ev) + sizeof(*ev);
 482         ev->cr.req_ie_len = req_ie_len;
 483         memcpy((void *)ev->cr.req_ie, req_ie, req_ie_len);
 484         ev->cr.resp_ie = ((u8 *)ev) + sizeof(*ev) + req_ie_len;
 485         ev->cr.resp_ie_len = resp_ie_len;
 486         memcpy((void *)ev->cr.resp_ie, resp_ie, resp_ie_len);
 487         ev->cr.status = status;
 488
 489         spin_lock_irqsave(&wdev->event_lock, flags);
 490         list_add_tail(&ev->list, &wdev->event_list);
 491         spin_unlock_irqrestore(&wdev->event_lock, flags);
 492         queue_work(cfg80211_wq, &rdev->event_work);
 493 }
 494 EXPORT_SYMBOL(cfg80211_connect_result);
 495
 496 void __cfg80211_roamed(struct wireless_dev *wdev, const u8 *bssid,
 497                        const u8 *req_ie, size_t req_ie_len,
 498                        const u8 *resp_ie, size_t resp_ie_len)
 499 {
 500         struct cfg80211_bss *bss;
 501 #ifdef CONFIG_CFG80211_WEXT
 502         union iwreq_data wrqu;
 503 #endif
 504
 505         ASSERT_WDEV_LOCK(wdev);
 506
 507         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
 508                 return;
 509
 510         if (wdev->sme_state != CFG80211_SME_CONNECTED)
 511                 return;
 512
 513         /* internal error -- how did we get to CONNECTED w/o BSS? */
 514         if (WARN_ON(!wdev->current_bss)) {
 515                 return;
 516         }
 517
 518         cfg80211_unhold_bss(wdev->current_bss);
 519         cfg80211_put_bss(&wdev->current_bss->pub);
 520         wdev->current_bss = NULL;
 521
 522         bss = cfg80211_get_bss(wdev->wiphy, NULL, bssid,
 523                                wdev->ssid, wdev->ssid_len,
 524                                WLAN_CAPABILITY_ESS, WLAN_CAPABILITY_ESS);
 525
 526         if (WARN_ON(!bss))
 527                 return;
 528
 529         cfg80211_hold_bss(bss_from_pub(bss));
 530         wdev->current_bss = bss_from_pub(bss);
 531
 532         nl80211_send_roamed(wiphy_to_dev(wdev->wiphy), wdev->netdev, bssid,
 533                             req_ie, req_ie_len, resp_ie, resp_ie_len,
 534                             GFP_KERNEL);
 535
 536 #ifdef CONFIG_CFG80211_WEXT
 537         if (req_ie) {
 538                 memset(&wrqu, 0, sizeof(wrqu));
 539                 wrqu.data.length = req_ie_len;
 540                 wireless_send_event(wdev->netdev, IWEVASSOCREQIE,
 541                                     &wrqu, req_ie);
 542         }
 543
 544         if (resp_ie) {
 545                 memset(&wrqu, 0, sizeof(wrqu));
 546                 wrqu.data.length = resp_ie_len;
 547                 wireless_send_event(wdev->netdev, IWEVASSOCRESPIE,
 548                                     &wrqu, resp_ie);
 549         }
 550
 551         memset(&wrqu, 0, sizeof(wrqu));
 552         wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 553         memcpy(wrqu.ap_addr.sa_data, bssid, ETH_ALEN);
 554         memcpy(wdev->wext.prev_bssid, bssid, ETH_ALEN);
 555         wdev->wext.prev_bssid_valid = true;
 556         wireless_send_event(wdev->netdev, SIOCGIWAP, &wrqu, NULL);
 557 #endif
 558 }
 559
 560 void cfg80211_roamed(struct net_device *dev, const u8 *bssid,
 561                      const u8 *req_ie, size_t req_ie_len,
 562                      const u8 *resp_ie, size_t resp_ie_len, gfp_t gfp)
 563 {
 564         struct wireless_dev *wdev = dev->ieee80211_ptr;
 565         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 566         struct cfg80211_event *ev;
 567         unsigned long flags;
 568
 569         CFG80211_DEV_WARN_ON(wdev->sme_state != CFG80211_SME_CONNECTED);
 570
 571         ev = kzalloc(sizeof(*ev) + req_ie_len + resp_ie_len, gfp);
 572         if (!ev)
 573                 return;
 574
 575         ev->type = EVENT_ROAMED;
 576         memcpy(ev->rm.bssid, bssid, ETH_ALEN);
 577         ev->rm.req_ie = ((u8 *)ev) + sizeof(*ev);
 578         ev->rm.req_ie_len = req_ie_len;
 579         memcpy((void *)ev->rm.req_ie, req_ie, req_ie_len);
 580         ev->rm.resp_ie = ((u8 *)ev) + sizeof(*ev) + req_ie_len;
 581         ev->rm.resp_ie_len = resp_ie_len;
 582         memcpy((void *)ev->rm.resp_ie, resp_ie, resp_ie_len);
 583
 584         spin_lock_irqsave(&wdev->event_lock, flags);
 585         list_add_tail(&ev->list, &wdev->event_list);
 586         spin_unlock_irqrestore(&wdev->event_lock, flags);
 587         queue_work(cfg80211_wq, &rdev->event_work);
 588 }
 589 EXPORT_SYMBOL(cfg80211_roamed);
 590
 591 void __cfg80211_disconnected(struct net_device *dev, const u8 *ie,
 592                              size_t ie_len, u16 reason, bool from_ap)
 593 {
 594         struct wireless_dev *wdev = dev->ieee80211_ptr;
 595         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 596         int i;
 597 #ifdef CONFIG_CFG80211_WEXT
 598         union iwreq_data wrqu;
 599 #endif
 600
 601         ASSERT_WDEV_LOCK(wdev);
 602
 603         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
 604                 return;
 605
 606         if (wdev->sme_state != CFG80211_SME_CONNECTED)
 607                 return;
 608
 609         if (wdev->current_bss) {
 610                 cfg80211_unhold_bss(wdev->current_bss);
 611                 cfg80211_put_bss(&wdev->current_bss->pub);
 612         }
 613
 614         wdev->current_bss = NULL;
 615         wdev->sme_state = CFG80211_SME_IDLE;
 616         wdev->ssid_len = 0;
 617
 618         if (wdev->conn) {
 619                 const u8 *bssid;
 620                 int ret;
 621
 622                 kfree(wdev->conn->ie);
 623                 wdev->conn->ie = NULL;
 624                 kfree(wdev->conn);
 625                 wdev->conn = NULL;
 626
 627                 /*
 628                  * If this disconnect was due to a disassoc, we
 629                  * we might still have an auth BSS around. For
 630                  * the userspace SME that's currently expected,
 631                  * but for the kernel SME (nl80211 CONNECT or
 632                  * wireless extensions) we want to clear up all
 633                  * state.
 634                  */
 635                 for (i = 0; i < MAX_AUTH_BSSES; i++) {
 636                         if (!wdev->auth_bsses[i])
 637                                 continue;
 638                         bssid = wdev->auth_bsses[i]->pub.bssid;
 639                         ret = __cfg80211_mlme_deauth(rdev, dev, bssid, NULL, 0,
 640                                                 WLAN_REASON_DEAUTH_LEAVING);
 641                         WARN(ret, "deauth failed: %d\n", ret);
 642                 }
 643         }
 644
 645         nl80211_send_disconnected(rdev, dev, reason, ie, ie_len, from_ap);
 646
 647         /*
 648          * Delete all the keys ... pairwise keys can't really
 649          * exist any more anyway, but default keys might.
 650          */
 651         if (rdev->ops->del_key)
 652                 for (i = 0; i < 6; i++)
 653                         rdev->ops->del_key(wdev->wiphy, dev, i, NULL);
 654
 655 #ifdef CONFIG_CFG80211_WEXT
 656         memset(&wrqu, 0, sizeof(wrqu));
 657         wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 658         wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL);
 659         wdev->wext.connect.ssid_len = 0;
 660 #endif
 661 }
 662
 663 void cfg80211_disconnected(struct net_device *dev, u16 reason,
 664                            u8 *ie, size_t ie_len, gfp_t gfp)
 665 {
 666         struct wireless_dev *wdev = dev->ieee80211_ptr;
 667         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 668         struct cfg80211_event *ev;
 669         unsigned long flags;
 670
 671         CFG80211_DEV_WARN_ON(wdev->sme_state != CFG80211_SME_CONNECTED);
 672
 673         ev = kzalloc(sizeof(*ev) + ie_len, gfp);
 674         if (!ev)
 675                 return;
 676
 677         ev->type = EVENT_DISCONNECTED;
 678         ev->dc.ie = ((u8 *)ev) + sizeof(*ev);
 679         ev->dc.ie_len = ie_len;
 680         memcpy((void *)ev->dc.ie, ie, ie_len);
 681         ev->dc.reason = reason;
 682
 683         spin_lock_irqsave(&wdev->event_lock, flags);
 684         list_add_tail(&ev->list, &wdev->event_list);
 685         spin_unlock_irqrestore(&wdev->event_lock, flags);
 686         queue_work(cfg80211_wq, &rdev->event_work);
 687 }
 688 EXPORT_SYMBOL(cfg80211_disconnected);
 689
 690 int __cfg80211_connect(struct cfg80211_registered_device *rdev,
 691                        struct net_device *dev,
 692                        struct cfg80211_connect_params *connect,
 693                        struct cfg80211_cached_keys *connkeys,
 694                        const u8 *prev_bssid)
 695 {
 696         struct wireless_dev *wdev = dev->ieee80211_ptr;
 697         struct ieee80211_channel *chan;
 698         struct cfg80211_bss *bss = NULL;
 699         int err;
 700
 701         ASSERT_WDEV_LOCK(wdev);
 702
 703         if (wdev->sme_state != CFG80211_SME_IDLE)
 704                 return -EALREADY;
 705
 706         chan = rdev_fixed_channel(rdev, wdev);
 707         if (chan && chan != connect->channel)
 708                 return -EBUSY;
 709
 710         if (WARN_ON(wdev->connect_keys)) {
 711                 kfree(wdev->connect_keys);
 712                 wdev->connect_keys = NULL;
 713         }
 714
 715         if (connkeys && connkeys->def >= 0) {
 716                 int idx;
 717                 u32 cipher;
 718
 719                 idx = connkeys->def;
 720                 cipher = connkeys->params[idx].cipher;
 721                 /* If given a WEP key we may need it for shared key auth */
 722                 if (cipher == WLAN_CIPHER_SUITE_WEP40 ||
 723                     cipher == WLAN_CIPHER_SUITE_WEP104) {
 724                         connect->key_idx = idx;
 725                         connect->key = connkeys->params[idx].key;
 726                         connect->key_len = connkeys->params[idx].key_len;
 727
 728                         /*
 729                          * If ciphers are not set (e.g. when going through
 730                          * iwconfig), we have to set them appropriately here.
 731                          */
 732                         if (connect->crypto.cipher_group == 0)
 733                                 connect->crypto.cipher_group = cipher;
 734
 735                         if (connect->crypto.n_ciphers_pairwise == 0) {
 736                                 connect->crypto.n_ciphers_pairwise = 1;
 737                                 connect->crypto.ciphers_pairwise[0] = cipher;
 738                         }
 739                 }
 740         }
 741
 742         if (!rdev->ops->connect) {
 743                 if (!rdev->ops->auth || !rdev->ops->assoc)
 744                         return -EOPNOTSUPP;
 745
 746                 if (WARN_ON(wdev->conn))
 747                         return -EINPROGRESS;
 748
 749                 wdev->conn = kzalloc(sizeof(*wdev->conn), GFP_KERNEL);
 750                 if (!wdev->conn)
 751                         return -ENOMEM;
 752
 753                 /*
 754                  * Copy all parameters, and treat explicitly IEs, BSSID, SSID.
 755                  */
 756                 memcpy(&wdev->conn->params, connect, sizeof(*connect));
 757                 if (connect->bssid) {
 758                         wdev->conn->params.bssid = wdev->conn->bssid;
 759                         memcpy(wdev->conn->bssid, connect->bssid, ETH_ALEN);
 760                 }
 761
 762                 if (connect->ie) {
 763                         wdev->conn->ie = kmemdup(connect->ie, connect->ie_len,
 764                                                 GFP_KERNEL);
 765                         wdev->conn->params.ie = wdev->conn->ie;
 766                         if (!wdev->conn->ie) {
 767                                 kfree(wdev->conn);
 768                                 wdev->conn = NULL;
 769                                 return -ENOMEM;
 770                         }
 771                 }
 772
 773                 if (connect->auth_type == NL80211_AUTHTYPE_AUTOMATIC) {
 774                         wdev->conn->auto_auth = true;
 775                         /* start with open system ... should mostly work */
 776                         wdev->conn->params.auth_type =
 777                                 NL80211_AUTHTYPE_OPEN_SYSTEM;
 778                 } else {
 779                         wdev->conn->auto_auth = false;
 780                 }
 781
 782                 memcpy(wdev->ssid, connect->ssid, connect->ssid_len);
 783                 wdev->ssid_len = connect->ssid_len;
 784                 wdev->conn->params.ssid = wdev->ssid;
 785                 wdev->conn->params.ssid_len = connect->ssid_len;
 786
 787                 /* see if we have the bss already */
 788                 bss = cfg80211_get_conn_bss(wdev);
 789
 790                 wdev->sme_state = CFG80211_SME_CONNECTING;
 791                 wdev->connect_keys = connkeys;
 792
 793                 if (prev_bssid) {
 794                         memcpy(wdev->conn->prev_bssid, prev_bssid, ETH_ALEN);
 795                         wdev->conn->prev_bssid_valid = true;
 796                 }
 797
 798                 /* we're good if we have a matching bss struct */
 799                 if (bss) {
 800                         wdev->conn->state = CFG80211_CONN_AUTHENTICATE_NEXT;
 801                         err = cfg80211_conn_do_work(wdev);
 802                         cfg80211_put_bss(bss);
 803                 } else {
 804                         /* otherwise we'll need to scan for the AP first */
 805                         err = cfg80211_conn_scan(wdev);
 806                         /*
 807                          * If we can't scan right now, then we need to scan again
 808                          * after the current scan finished, since the parameters
 809                          * changed (unless we find a good AP anyway).
 810                          */
 811                         if (err == -EBUSY) {
 812                                 err = 0;
 813                                 wdev->conn->state = CFG80211_CONN_SCAN_AGAIN;
 814                         }
 815                 }
 816                 if (err) {
 817                         kfree(wdev->conn->ie);
 818                         kfree(wdev->conn);
 819                         wdev->conn = NULL;
 820                         wdev->sme_state = CFG80211_SME_IDLE;
 821                         wdev->connect_keys = NULL;
 822                         wdev->ssid_len = 0;
 823                 }
 824
 825                 return err;
 826         } else {
 827                 wdev->sme_state = CFG80211_SME_CONNECTING;
 828                 wdev->connect_keys = connkeys;
 829                 err = rdev->ops->connect(&rdev->wiphy, dev, connect);
 830                 if (err) {
 831                         wdev->connect_keys = NULL;
 832                         wdev->sme_state = CFG80211_SME_IDLE;
 833                         return err;
 834                 }
 835
 836                 memcpy(wdev->ssid, connect->ssid, connect->ssid_len);
 837                 wdev->ssid_len = connect->ssid_len;
 838
 839                 return 0;
 840         }
 841 }
 842
 843 int cfg80211_connect(struct cfg80211_registered_device *rdev,
 844                      struct net_device *dev,
 845                      struct cfg80211_connect_params *connect,
 846                      struct cfg80211_cached_keys *connkeys)
 847 {
 848         int err;
 849
 850         mutex_lock(&rdev->devlist_mtx);
 851         wdev_lock(dev->ieee80211_ptr);
 852         err = __cfg80211_connect(rdev, dev, connect, connkeys, NULL);
 853         wdev_unlock(dev->ieee80211_ptr);
 854         mutex_unlock(&rdev->devlist_mtx);
 855
 856         return err;
 857 }
 858
 859 int __cfg80211_disconnect(struct cfg80211_registered_device *rdev,
 860                           struct net_device *dev, u16 reason, bool wextev)
 861 {
 862         struct wireless_dev *wdev = dev->ieee80211_ptr;
 863         int err;
 864
 865         ASSERT_WDEV_LOCK(wdev);
 866
 867         if (wdev->sme_state == CFG80211_SME_IDLE)
 868                 return -EINVAL;
 869
 870         kfree(wdev->connect_keys);
 871         wdev->connect_keys = NULL;
 872
 873         if (!rdev->ops->disconnect) {
 874                 if (!rdev->ops->deauth)
 875                         return -EOPNOTSUPP;
 876
 877                 /* was it connected by userspace SME? */
 878                 if (!wdev->conn) {
 879                         cfg80211_mlme_down(rdev, dev);
 880                         return 0;
 881                 }
 882
 883                 if (wdev->sme_state == CFG80211_SME_CONNECTING &&
 884                     (wdev->conn->state == CFG80211_CONN_SCANNING ||
 885                      wdev->conn->state == CFG80211_CONN_SCAN_AGAIN)) {
 886                         wdev->sme_state = CFG80211_SME_IDLE;
 887                         kfree(wdev->conn->ie);
 888                         kfree(wdev->conn);
 889                         wdev->conn = NULL;
 890                         wdev->ssid_len = 0;
 891                         return 0;
 892                 }
 893
 894                 /* wdev->conn->params.bssid must be set if > SCANNING */
 895                 err = __cfg80211_mlme_deauth(rdev, dev,
 896                                              wdev->conn->params.bssid,
 897                                              NULL, 0, reason);
 898                 if (err)
 899                         return err;
 900         } else {
 901                 err = rdev->ops->disconnect(&rdev->wiphy, dev, reason);
 902                 if (err)
 903                         return err;
 904         }
 905
 906         if (wdev->sme_state == CFG80211_SME_CONNECTED)
 907                 __cfg80211_disconnected(dev, NULL, 0, 0, false);
 908         else if (wdev->sme_state == CFG80211_SME_CONNECTING)
 909                 __cfg80211_connect_result(dev, NULL, NULL, 0, NULL, 0,
 910                                           WLAN_STATUS_UNSPECIFIED_FAILURE,
 911                                           wextev, NULL);
 912
 913         return 0;
 914 }
 915
 916 int cfg80211_disconnect(struct cfg80211_registered_device *rdev,
 917                         struct net_device *dev,
 918                         u16 reason, bool wextev)
 919 {
 920         int err;
 921
 922         wdev_lock(dev->ieee80211_ptr);
 923         err = __cfg80211_disconnect(rdev, dev, reason, wextev);
 924         wdev_unlock(dev->ieee80211_ptr);
 925
 926         return err;
 927 }
 928
 929 void cfg80211_sme_disassoc(struct net_device *dev, int idx)
 930 {
 931         struct wireless_dev *wdev = dev->ieee80211_ptr;
 932         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 933         u8 bssid[ETH_ALEN];
 934
 935         ASSERT_WDEV_LOCK(wdev);
 936
 937         if (!wdev->conn)
 938                 return;
 939
 940         if (wdev->conn->state == CFG80211_CONN_IDLE)
 941                 return;
 942
 943         /*
 944          * Ok, so the association was made by this SME -- we don't
 945          * want it any more so deauthenticate too.
 946          */
 947
 948         if (!wdev->auth_bsses[idx])
 949                 return;
 950
 951         memcpy(bssid, wdev->auth_bsses[idx]->pub.bssid, ETH_ALEN);
 952         if (__cfg80211_mlme_deauth(rdev, dev, bssid,
 953                                    NULL, 0, WLAN_REASON_DEAUTH_LEAVING)) {
 954                 /* whatever -- assume gone anyway */
 955                 cfg80211_unhold_bss(wdev->auth_bsses[idx]);
 956                 cfg80211_put_bss(&wdev->auth_bsses[idx]->pub);
 957                 wdev->auth_bsses[idx] = NULL;
 958         }
 959 }