net/wireless/sme.c

   1 /*
   2  * SME code for cfg80211
   3  * both driver SME event handling and the SME implementation
   4  * (for nl80211's connect() and wext)
   5  *
   6  * Copyright 2009       Johannes Berg <johannes@sipsolutions.net>
   7  * Copyright (C) 2009   Intel Corporation. All rights reserved.
   8  */
   9
  10 #include <linux/etherdevice.h>
  11 #include <linux/if_arp.h>
  12 #include <linux/slab.h>
  13 #include <linux/workqueue.h>
  14 #include <linux/wireless.h>
  15 #include <linux/export.h>
  16 #include <net/iw_handler.h>
  17 #include <net/cfg80211.h>
  18 #include <net/rtnetlink.h>
  19 #include "nl80211.h"
  20 #include "reg.h"
  21 #include "rdev-ops.h"
  22
  23 /*
  24  * Software SME in cfg80211, using auth/assoc/deauth calls to the
  25  * driver. This is is for implementing nl80211's connect/disconnect
  26  * and wireless extensions (if configured.)
  27  */
  28
  29 struct cfg80211_conn {
  30         struct cfg80211_connect_params params;
  31         /* these are sub-states of the _CONNECTING sme_state */
  32         enum {
  33                 CFG80211_CONN_SCANNING,
  34                 CFG80211_CONN_SCAN_AGAIN,
  35                 CFG80211_CONN_AUTHENTICATE_NEXT,
  36                 CFG80211_CONN_AUTHENTICATING,
  37                 CFG80211_CONN_AUTH_FAILED,
  38                 CFG80211_CONN_ASSOCIATE_NEXT,
  39                 CFG80211_CONN_ASSOCIATING,
  40                 CFG80211_CONN_ASSOC_FAILED,
  41                 CFG80211_CONN_DEAUTH,
  42                 CFG80211_CONN_ABANDON,
  43                 CFG80211_CONN_CONNECTED,
  44         } state;
  45         u8 bssid[ETH_ALEN], prev_bssid[ETH_ALEN];
  46         const u8 *ie;
  47         size_t ie_len;
  48         bool auto_auth, prev_bssid_valid;
  49 };
  50
  51 static void cfg80211_sme_free(struct wireless_dev *wdev)
  52 {
  53         if (!wdev->conn)
  54                 return;
  55
  56         kfree(wdev->conn->ie);
  57         kfree(wdev->conn);
  58         wdev->conn = NULL;
  59 }
  60
  61 static int cfg80211_conn_scan(struct wireless_dev *wdev)
  62 {
  63         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
  64         struct cfg80211_scan_request *request;
  65         int n_channels, err;
  66
  67         ASSERT_RTNL();
  68         ASSERT_WDEV_LOCK(wdev);
  69
  70         if (rdev->scan_req || rdev->scan_msg)
  71                 return -EBUSY;
  72
  73         if (wdev->conn->params.channel)
  74                 n_channels = 1;
  75         else
  76                 n_channels = ieee80211_get_num_supported_channels(wdev->wiphy);
  77
  78         request = kzalloc(sizeof(*request) + sizeof(request->ssids[0]) +
  79                           sizeof(request->channels[0]) * n_channels,
  80                           GFP_KERNEL);
  81         if (!request)
  82                 return -ENOMEM;
  83
  84         if (wdev->conn->params.channel) {
  85                 enum nl80211_band band = wdev->conn->params.channel->band;
  86                 struct ieee80211_supported_band *sband =
  87                         wdev->wiphy->bands[band];
  88
  89                 if (!sband) {
  90                         kfree(request);
  91                         return -EINVAL;
  92                 }
  93                 request->channels[0] = wdev->conn->params.channel;
  94                 request->rates[band] = (1 << sband->n_bitrates) - 1;
  95         } else {
  96                 int i = 0, j;
  97                 enum nl80211_band band;
  98                 struct ieee80211_supported_band *bands;
  99                 struct ieee80211_channel *channel;
 100
 101                 for (band = 0; band < NUM_NL80211_BANDS; band++) {
 102                         bands = wdev->wiphy->bands[band];
 103                         if (!bands)
 104                                 continue;
 105                         for (j = 0; j < bands->n_channels; j++) {
 106                                 channel = &bands->channels[j];
 107                                 if (channel->flags & IEEE80211_CHAN_DISABLED)
 108                                         continue;
 109                                 request->channels[i++] = channel;
 110                         }
 111                         request->rates[band] = (1 << bands->n_bitrates) - 1;
 112                 }
 113                 n_channels = i;
 114         }
 115         request->n_channels = n_channels;
 116         request->ssids = (void *)&request->channels[n_channels];
 117         request->n_ssids = 1;
 118
 119         memcpy(request->ssids[0].ssid, wdev->conn->params.ssid,
 120                 wdev->conn->params.ssid_len);
 121         request->ssids[0].ssid_len = wdev->conn->params.ssid_len;
 122
 123         eth_broadcast_addr(request->bssid);
 124
 125         request->wdev = wdev;
 126         request->wiphy = &rdev->wiphy;
 127         request->scan_start = jiffies;
 128
 129         rdev->scan_req = request;
 130
 131         err = rdev_scan(rdev, request);
 132         if (!err) {
 133                 wdev->conn->state = CFG80211_CONN_SCANNING;
 134                 nl80211_send_scan_start(rdev, wdev);
 135                 dev_hold(wdev->netdev);
 136         } else {
 137                 rdev->scan_req = NULL;
 138                 kfree(request);
 139         }
 140         return err;
 141 }
 142
 143 static int cfg80211_conn_do_work(struct wireless_dev *wdev)
 144 {
 145         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 146         struct cfg80211_connect_params *params;
 147         struct cfg80211_assoc_request req = {};
 148         int err;
 149
 150         ASSERT_WDEV_LOCK(wdev);
 151
 152         if (!wdev->conn)
 153                 return 0;
 154
 155         params = &wdev->conn->params;
 156
 157         switch (wdev->conn->state) {
 158         case CFG80211_CONN_SCANNING:
 159                 /* didn't find it during scan ... */
 160                 return -ENOENT;
 161         case CFG80211_CONN_SCAN_AGAIN:
 162                 return cfg80211_conn_scan(wdev);
 163         case CFG80211_CONN_AUTHENTICATE_NEXT:
 164                 if (WARN_ON(!rdev->ops->auth))
 165                         return -EOPNOTSUPP;
 166                 wdev->conn->state = CFG80211_CONN_AUTHENTICATING;
 167                 return cfg80211_mlme_auth(rdev, wdev->netdev,
 168                                           params->channel, params->auth_type,
 169                                           params->bssid,
 170                                           params->ssid, params->ssid_len,
 171                                           NULL, 0,
 172                                           params->key, params->key_len,
 173                                           params->key_idx, NULL, 0);
 174         case CFG80211_CONN_AUTH_FAILED:
 175                 return -ENOTCONN;
 176         case CFG80211_CONN_ASSOCIATE_NEXT:
 177                 if (WARN_ON(!rdev->ops->assoc))
 178                         return -EOPNOTSUPP;
 179                 wdev->conn->state = CFG80211_CONN_ASSOCIATING;
 180                 if (wdev->conn->prev_bssid_valid)
 181                         req.prev_bssid = wdev->conn->prev_bssid;
 182                 req.ie = params->ie;
 183                 req.ie_len = params->ie_len;
 184                 req.use_mfp = params->mfp != NL80211_MFP_NO;
 185                 req.crypto = params->crypto;
 186                 req.flags = params->flags;
 187                 req.ht_capa = params->ht_capa;
 188                 req.ht_capa_mask = params->ht_capa_mask;
 189                 req.vht_capa = params->vht_capa;
 190                 req.vht_capa_mask = params->vht_capa_mask;
 191
 192                 err = cfg80211_mlme_assoc(rdev, wdev->netdev, params->channel,
 193                                           params->bssid, params->ssid,
 194                                           params->ssid_len, &req);
 195                 if (err)
 196                         cfg80211_mlme_deauth(rdev, wdev->netdev, params->bssid,
 197                                              NULL, 0,
 198                                              WLAN_REASON_DEAUTH_LEAVING,
 199                                              false);
 200                 return err;
 201         case CFG80211_CONN_ASSOC_FAILED:
 202                 cfg80211_mlme_deauth(rdev, wdev->netdev, params->bssid,
 203                                      NULL, 0,
 204                                      WLAN_REASON_DEAUTH_LEAVING, false);
 205                 return -ENOTCONN;
 206         case CFG80211_CONN_DEAUTH:
 207                 cfg80211_mlme_deauth(rdev, wdev->netdev, params->bssid,
 208                                      NULL, 0,
 209                                      WLAN_REASON_DEAUTH_LEAVING, false);
 210                 /* fall through */
 211         case CFG80211_CONN_ABANDON:
 212                 /* free directly, disconnected event already sent */
 213                 cfg80211_sme_free(wdev);
 214                 return 0;
 215         default:
 216                 return 0;
 217         }
 218 }
 219
 220 void cfg80211_conn_work(struct work_struct *work)
 221 {
 222         struct cfg80211_registered_device *rdev =
 223                 container_of(work, struct cfg80211_registered_device, conn_work);
 224         struct wireless_dev *wdev;
 225         u8 bssid_buf[ETH_ALEN], *bssid = NULL;
 226
 227         rtnl_lock();
 228
 229         list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
 230                 if (!wdev->netdev)
 231                         continue;
 232
 233                 wdev_lock(wdev);
 234                 if (!netif_running(wdev->netdev)) {
 235                         wdev_unlock(wdev);
 236                         continue;
 237                 }
 238                 if (!wdev->conn ||
 239                     wdev->conn->state == CFG80211_CONN_CONNECTED) {
 240                         wdev_unlock(wdev);
 241                         continue;
 242                 }
 243                 if (wdev->conn->params.bssid) {
 244                         memcpy(bssid_buf, wdev->conn->params.bssid, ETH_ALEN);
 245                         bssid = bssid_buf;
 246                 }
 247                 if (cfg80211_conn_do_work(wdev)) {
 248                         __cfg80211_connect_result(
 249                                         wdev->netdev, bssid,
 250                                         NULL, 0, NULL, 0, -1, false, NULL);
 251                 }
 252                 wdev_unlock(wdev);
 253         }
 254
 255         rtnl_unlock();
 256 }
 257
 258 /* Returned bss is reference counted and must be cleaned up appropriately. */
 259 static struct cfg80211_bss *cfg80211_get_conn_bss(struct wireless_dev *wdev)
 260 {
 261         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 262         struct cfg80211_bss *bss;
 263
 264         ASSERT_WDEV_LOCK(wdev);
 265
 266         bss = cfg80211_get_bss(wdev->wiphy, wdev->conn->params.channel,
 267                                wdev->conn->params.bssid,
 268                                wdev->conn->params.ssid,
 269                                wdev->conn->params.ssid_len,
 270                                wdev->conn_bss_type,
 271                                IEEE80211_PRIVACY(wdev->conn->params.privacy));
 272         if (!bss)
 273                 return NULL;
 274
 275         memcpy(wdev->conn->bssid, bss->bssid, ETH_ALEN);
 276         wdev->conn->params.bssid = wdev->conn->bssid;
 277         wdev->conn->params.channel = bss->channel;
 278         wdev->conn->state = CFG80211_CONN_AUTHENTICATE_NEXT;
 279         schedule_work(&rdev->conn_work);
 280
 281         return bss;
 282 }
 283
 284 static void __cfg80211_sme_scan_done(struct net_device *dev)
 285 {
 286         struct wireless_dev *wdev = dev->ieee80211_ptr;
 287         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 288         struct cfg80211_bss *bss;
 289
 290         ASSERT_WDEV_LOCK(wdev);
 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(&rdev->wiphy, bss);
 302         else
 303                 schedule_work(&rdev->conn_work);
 304 }
 305
 306 void cfg80211_sme_scan_done(struct net_device *dev)
 307 {
 308         struct wireless_dev *wdev = dev->ieee80211_ptr;
 309
 310         wdev_lock(wdev);
 311         __cfg80211_sme_scan_done(dev);
 312         wdev_unlock(wdev);
 313 }
 314
 315 void cfg80211_sme_rx_auth(struct wireless_dev *wdev, const u8 *buf, size_t len)
 316 {
 317         struct wiphy *wiphy = wdev->wiphy;
 318         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 319         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)buf;
 320         u16 status_code = le16_to_cpu(mgmt->u.auth.status_code);
 321
 322         ASSERT_WDEV_LOCK(wdev);
 323
 324         if (!wdev->conn || wdev->conn->state == CFG80211_CONN_CONNECTED)
 325                 return;
 326
 327         if (status_code == WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG &&
 328             wdev->conn->auto_auth &&
 329             wdev->conn->params.auth_type != NL80211_AUTHTYPE_NETWORK_EAP) {
 330                 /* select automatically between only open, shared, leap */
 331                 switch (wdev->conn->params.auth_type) {
 332                 case NL80211_AUTHTYPE_OPEN_SYSTEM:
 333                         if (wdev->connect_keys)
 334                                 wdev->conn->params.auth_type =
 335                                         NL80211_AUTHTYPE_SHARED_KEY;
 336                         else
 337                                 wdev->conn->params.auth_type =
 338                                         NL80211_AUTHTYPE_NETWORK_EAP;
 339                         break;
 340                 case NL80211_AUTHTYPE_SHARED_KEY:
 341                         wdev->conn->params.auth_type =
 342                                 NL80211_AUTHTYPE_NETWORK_EAP;
 343                         break;
 344                 default:
 345                         /* huh? */
 346                         wdev->conn->params.auth_type =
 347                                 NL80211_AUTHTYPE_OPEN_SYSTEM;
 348                         break;
 349                 }
 350                 wdev->conn->state = CFG80211_CONN_AUTHENTICATE_NEXT;
 351                 schedule_work(&rdev->conn_work);
 352         } else if (status_code != WLAN_STATUS_SUCCESS) {
 353                 __cfg80211_connect_result(wdev->netdev, mgmt->bssid,
 354                                           NULL, 0, NULL, 0,
 355                                           status_code, false, NULL);
 356         } else if (wdev->conn->state == CFG80211_CONN_AUTHENTICATING) {
 357                 wdev->conn->state = CFG80211_CONN_ASSOCIATE_NEXT;
 358                 schedule_work(&rdev->conn_work);
 359         }
 360 }
 361
 362 bool cfg80211_sme_rx_assoc_resp(struct wireless_dev *wdev, u16 status)
 363 {
 364         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 365
 366         if (!wdev->conn)
 367                 return false;
 368
 369         if (status == WLAN_STATUS_SUCCESS) {
 370                 wdev->conn->state = CFG80211_CONN_CONNECTED;
 371                 return false;
 372         }
 373
 374         if (wdev->conn->prev_bssid_valid) {
 375                 /*
 376                  * Some stupid APs don't accept reassoc, so we
 377                  * need to fall back to trying regular assoc;
 378                  * return true so no event is sent to userspace.
 379                  */
 380                 wdev->conn->prev_bssid_valid = false;
 381                 wdev->conn->state = CFG80211_CONN_ASSOCIATE_NEXT;
 382                 schedule_work(&rdev->conn_work);
 383                 return true;
 384         }
 385
 386         wdev->conn->state = CFG80211_CONN_ASSOC_FAILED;
 387         schedule_work(&rdev->conn_work);
 388         return false;
 389 }
 390
 391 void cfg80211_sme_deauth(struct wireless_dev *wdev)
 392 {
 393         cfg80211_sme_free(wdev);
 394 }
 395
 396 void cfg80211_sme_auth_timeout(struct wireless_dev *wdev)
 397 {
 398         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 399
 400         if (!wdev->conn)
 401                 return;
 402
 403         wdev->conn->state = CFG80211_CONN_AUTH_FAILED;
 404         schedule_work(&rdev->conn_work);
 405 }
 406
 407 void cfg80211_sme_disassoc(struct wireless_dev *wdev)
 408 {
 409         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 410
 411         if (!wdev->conn)
 412                 return;
 413
 414         wdev->conn->state = CFG80211_CONN_DEAUTH;
 415         schedule_work(&rdev->conn_work);
 416 }
 417
 418 void cfg80211_sme_assoc_timeout(struct wireless_dev *wdev)
 419 {
 420         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 421
 422         if (!wdev->conn)
 423                 return;
 424
 425         wdev->conn->state = CFG80211_CONN_ASSOC_FAILED;
 426         schedule_work(&rdev->conn_work);
 427 }
 428
 429 void cfg80211_sme_abandon_assoc(struct wireless_dev *wdev)
 430 {
 431         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 432
 433         if (!wdev->conn)
 434                 return;
 435
 436         wdev->conn->state = CFG80211_CONN_ABANDON;
 437         schedule_work(&rdev->conn_work);
 438 }
 439
 440 static int cfg80211_sme_get_conn_ies(struct wireless_dev *wdev,
 441                                      const u8 *ies, size_t ies_len,
 442                                      const u8 **out_ies, size_t *out_ies_len)
 443 {
 444         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 445         u8 *buf;
 446         size_t offs;
 447
 448         if (!rdev->wiphy.extended_capabilities_len ||
 449             (ies && cfg80211_find_ie(WLAN_EID_EXT_CAPABILITY, ies, ies_len))) {
 450                 *out_ies = kmemdup(ies, ies_len, GFP_KERNEL);
 451                 if (!*out_ies)
 452                         return -ENOMEM;
 453                 *out_ies_len = ies_len;
 454                 return 0;
 455         }
 456
 457         buf = kmalloc(ies_len + rdev->wiphy.extended_capabilities_len + 2,
 458                       GFP_KERNEL);
 459         if (!buf)
 460                 return -ENOMEM;
 461
 462         if (ies_len) {
 463                 static const u8 before_extcapa[] = {
 464                         /* not listing IEs expected to be created by driver */
 465                         WLAN_EID_RSN,
 466                         WLAN_EID_QOS_CAPA,
 467                         WLAN_EID_RRM_ENABLED_CAPABILITIES,
 468                         WLAN_EID_MOBILITY_DOMAIN,
 469                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 470                         WLAN_EID_BSS_COEX_2040,
 471                 };
 472
 473                 offs = ieee80211_ie_split(ies, ies_len, before_extcapa,
 474                                           ARRAY_SIZE(before_extcapa), 0);
 475                 memcpy(buf, ies, offs);
 476                 /* leave a whole for extended capabilities IE */
 477                 memcpy(buf + offs + rdev->wiphy.extended_capabilities_len + 2,
 478                        ies + offs, ies_len - offs);
 479         } else {
 480                 offs = 0;
 481         }
 482
 483         /* place extended capabilities IE (with only driver capabilities) */
 484         buf[offs] = WLAN_EID_EXT_CAPABILITY;
 485         buf[offs + 1] = rdev->wiphy.extended_capabilities_len;
 486         memcpy(buf + offs + 2,
 487                rdev->wiphy.extended_capabilities,
 488                rdev->wiphy.extended_capabilities_len);
 489
 490         *out_ies = buf;
 491         *out_ies_len = ies_len + rdev->wiphy.extended_capabilities_len + 2;
 492
 493         return 0;
 494 }
 495
 496 static int cfg80211_sme_connect(struct wireless_dev *wdev,
 497                                 struct cfg80211_connect_params *connect,
 498                                 const u8 *prev_bssid)
 499 {
 500         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 501         struct cfg80211_bss *bss;
 502         int err;
 503
 504         if (!rdev->ops->auth || !rdev->ops->assoc)
 505                 return -EOPNOTSUPP;
 506
 507         if (wdev->current_bss) {
 508                 if (!prev_bssid)
 509                         return -EALREADY;
 510                 if (prev_bssid &&
 511                     !ether_addr_equal(prev_bssid, wdev->current_bss->pub.bssid))
 512                         return -ENOTCONN;
 513                 cfg80211_unhold_bss(wdev->current_bss);
 514                 cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
 515                 wdev->current_bss = NULL;
 516
 517                 cfg80211_sme_free(wdev);
 518         }
 519
 520         if (WARN_ON(wdev->conn))
 521                 return -EINPROGRESS;
 522
 523         wdev->conn = kzalloc(sizeof(*wdev->conn), GFP_KERNEL);
 524         if (!wdev->conn)
 525                 return -ENOMEM;
 526
 527         /*
 528          * Copy all parameters, and treat explicitly IEs, BSSID, SSID.
 529          */
 530         memcpy(&wdev->conn->params, connect, sizeof(*connect));
 531         if (connect->bssid) {
 532                 wdev->conn->params.bssid = wdev->conn->bssid;
 533                 memcpy(wdev->conn->bssid, connect->bssid, ETH_ALEN);
 534         }
 535
 536         if (cfg80211_sme_get_conn_ies(wdev, connect->ie, connect->ie_len,
 537                                       &wdev->conn->ie,
 538                                       &wdev->conn->params.ie_len)) {
 539                 kfree(wdev->conn);
 540                 wdev->conn = NULL;
 541                 return -ENOMEM;
 542         }
 543         wdev->conn->params.ie = wdev->conn->ie;
 544
 545         if (connect->auth_type == NL80211_AUTHTYPE_AUTOMATIC) {
 546                 wdev->conn->auto_auth = true;
 547                 /* start with open system ... should mostly work */
 548                 wdev->conn->params.auth_type =
 549                         NL80211_AUTHTYPE_OPEN_SYSTEM;
 550         } else {
 551                 wdev->conn->auto_auth = false;
 552         }
 553
 554         wdev->conn->params.ssid = wdev->ssid;
 555         wdev->conn->params.ssid_len = wdev->ssid_len;
 556
 557         /* see if we have the bss already */
 558         bss = cfg80211_get_conn_bss(wdev);
 559
 560         if (prev_bssid) {
 561                 memcpy(wdev->conn->prev_bssid, prev_bssid, ETH_ALEN);
 562                 wdev->conn->prev_bssid_valid = true;
 563         }
 564
 565         /* we're good if we have a matching bss struct */
 566         if (bss) {
 567                 err = cfg80211_conn_do_work(wdev);
 568                 cfg80211_put_bss(wdev->wiphy, bss);
 569         } else {
 570                 /* otherwise we'll need to scan for the AP first */
 571                 err = cfg80211_conn_scan(wdev);
 572
 573                 /*
 574                  * If we can't scan right now, then we need to scan again
 575                  * after the current scan finished, since the parameters
 576                  * changed (unless we find a good AP anyway).
 577                  */
 578                 if (err == -EBUSY) {
 579                         err = 0;
 580                         wdev->conn->state = CFG80211_CONN_SCAN_AGAIN;
 581                 }
 582         }
 583
 584         if (err)
 585                 cfg80211_sme_free(wdev);
 586
 587         return err;
 588 }
 589
 590 static int cfg80211_sme_disconnect(struct wireless_dev *wdev, u16 reason)
 591 {
 592         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 593         int err;
 594
 595         if (!wdev->conn)
 596                 return 0;
 597
 598         if (!rdev->ops->deauth)
 599                 return -EOPNOTSUPP;
 600
 601         if (wdev->conn->state == CFG80211_CONN_SCANNING ||
 602             wdev->conn->state == CFG80211_CONN_SCAN_AGAIN) {
 603                 err = 0;
 604                 goto out;
 605         }
 606
 607         /* wdev->conn->params.bssid must be set if > SCANNING */
 608         err = cfg80211_mlme_deauth(rdev, wdev->netdev,
 609                                    wdev->conn->params.bssid,
 610                                    NULL, 0, reason, false);
 611  out:
 612         cfg80211_sme_free(wdev);
 613         return err;
 614 }
 615
 616 /*
 617  * code shared for in-device and software SME
 618  */
 619
 620 static bool cfg80211_is_all_idle(void)
 621 {
 622         struct cfg80211_registered_device *rdev;
 623         struct wireless_dev *wdev;
 624         bool is_all_idle = true;
 625
 626         /*
 627          * All devices must be idle as otherwise if you are actively
 628          * scanning some new beacon hints could be learned and would
 629          * count as new regulatory hints.
 630          */
 631         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
 632                 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
 633                         wdev_lock(wdev);
 634                         if (wdev->conn || wdev->current_bss)
 635                                 is_all_idle = false;
 636                         wdev_unlock(wdev);
 637                 }
 638         }
 639
 640         return is_all_idle;
 641 }
 642
 643 static void disconnect_work(struct work_struct *work)
 644 {
 645         rtnl_lock();
 646         if (cfg80211_is_all_idle())
 647                 regulatory_hint_disconnect();
 648         rtnl_unlock();
 649 }
 650
 651 static DECLARE_WORK(cfg80211_disconnect_work, disconnect_work);
 652
 653
 654 /*
 655  * API calls for drivers implementing connect/disconnect and
 656  * SME event handling
 657  */
 658
 659 /* This method must consume bss one way or another */
 660 void __cfg80211_connect_result(struct net_device *dev, const u8 *bssid,
 661                                const u8 *req_ie, size_t req_ie_len,
 662                                const u8 *resp_ie, size_t resp_ie_len,
 663                                int status, bool wextev,
 664                                struct cfg80211_bss *bss)
 665 {
 666         struct wireless_dev *wdev = dev->ieee80211_ptr;
 667         const u8 *country_ie;
 668 #ifdef CONFIG_CFG80211_WEXT
 669         union iwreq_data wrqu;
 670 #endif
 671
 672         ASSERT_WDEV_LOCK(wdev);
 673
 674         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION &&
 675                     wdev->iftype != NL80211_IFTYPE_P2P_CLIENT)) {
 676                 cfg80211_put_bss(wdev->wiphy, bss);
 677                 return;
 678         }
 679
 680         nl80211_send_connect_result(wiphy_to_rdev(wdev->wiphy), dev,
 681                                     bssid, req_ie, req_ie_len,
 682                                     resp_ie, resp_ie_len,
 683                                     status, GFP_KERNEL);
 684
 685 #ifdef CONFIG_CFG80211_WEXT
 686         if (wextev) {
 687                 if (req_ie && status == WLAN_STATUS_SUCCESS) {
 688                         memset(&wrqu, 0, sizeof(wrqu));
 689                         wrqu.data.length = req_ie_len;
 690                         wireless_send_event(dev, IWEVASSOCREQIE, &wrqu, req_ie);
 691                 }
 692
 693                 if (resp_ie && status == WLAN_STATUS_SUCCESS) {
 694                         memset(&wrqu, 0, sizeof(wrqu));
 695                         wrqu.data.length = resp_ie_len;
 696                         wireless_send_event(dev, IWEVASSOCRESPIE, &wrqu, resp_ie);
 697                 }
 698
 699                 memset(&wrqu, 0, sizeof(wrqu));
 700                 wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 701                 if (bssid && status == WLAN_STATUS_SUCCESS) {
 702                         memcpy(wrqu.ap_addr.sa_data, bssid, ETH_ALEN);
 703                         memcpy(wdev->wext.prev_bssid, bssid, ETH_ALEN);
 704                         wdev->wext.prev_bssid_valid = true;
 705                 }
 706                 wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL);
 707         }
 708 #endif
 709
 710         if (!bss && (status == WLAN_STATUS_SUCCESS)) {
 711                 WARN_ON_ONCE(!wiphy_to_rdev(wdev->wiphy)->ops->connect);
 712                 bss = cfg80211_get_bss(wdev->wiphy, NULL, bssid,
 713                                        wdev->ssid, wdev->ssid_len,
 714                                        wdev->conn_bss_type,
 715                                        IEEE80211_PRIVACY_ANY);
 716                 if (bss)
 717                         cfg80211_hold_bss(bss_from_pub(bss));
 718         }
 719
 720         if (wdev->current_bss) {
 721                 cfg80211_unhold_bss(wdev->current_bss);
 722                 cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
 723                 wdev->current_bss = NULL;
 724         }
 725
 726         if (status != WLAN_STATUS_SUCCESS) {
 727                 kzfree(wdev->connect_keys);
 728                 wdev->connect_keys = NULL;
 729                 wdev->ssid_len = 0;
 730                 if (bss) {
 731                         cfg80211_unhold_bss(bss_from_pub(bss));
 732                         cfg80211_put_bss(wdev->wiphy, bss);
 733                 }
 734                 cfg80211_sme_free(wdev);
 735                 return;
 736         }
 737
 738         if (WARN_ON(!bss))
 739                 return;
 740
 741         wdev->current_bss = bss_from_pub(bss);
 742
 743         if (!(wdev->wiphy->flags & WIPHY_FLAG_HAS_STATIC_WEP))
 744                 cfg80211_upload_connect_keys(wdev);
 745
 746         rcu_read_lock();
 747         country_ie = ieee80211_bss_get_ie(bss, WLAN_EID_COUNTRY);
 748         if (!country_ie) {
 749                 rcu_read_unlock();
 750                 return;
 751         }
 752
 753         country_ie = kmemdup(country_ie, 2 + country_ie[1], GFP_ATOMIC);
 754         rcu_read_unlock();
 755
 756         if (!country_ie)
 757                 return;
 758
 759         /*
 760          * ieee80211_bss_get_ie() ensures we can access:
 761          * - country_ie + 2, the start of the country ie data, and
 762          * - and country_ie[1] which is the IE length
 763          */
 764         regulatory_hint_country_ie(wdev->wiphy, bss->channel->band,
 765                                    country_ie + 2, country_ie[1]);
 766         kfree(country_ie);
 767 }
 768
 769 /* Consumes bss object one way or another */
 770 void cfg80211_connect_bss(struct net_device *dev, const u8 *bssid,
 771                           struct cfg80211_bss *bss, const u8 *req_ie,
 772                           size_t req_ie_len, const u8 *resp_ie,
 773                           size_t resp_ie_len, int status, gfp_t gfp)
 774 {
 775         struct wireless_dev *wdev = dev->ieee80211_ptr;
 776         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 777         struct cfg80211_event *ev;
 778         unsigned long flags;
 779
 780         if (bss) {
 781                 /* Make sure the bss entry provided by the driver is valid. */
 782                 struct cfg80211_internal_bss *ibss = bss_from_pub(bss);
 783
 784                 if (WARN_ON(list_empty(&ibss->list))) {
 785                         cfg80211_put_bss(wdev->wiphy, bss);
 786                         return;
 787                 }
 788         }
 789
 790         ev = kzalloc(sizeof(*ev) + req_ie_len + resp_ie_len, gfp);
 791         if (!ev) {
 792                 cfg80211_put_bss(wdev->wiphy, bss);
 793                 return;
 794         }
 795
 796         ev->type = EVENT_CONNECT_RESULT;
 797         if (bssid)
 798                 memcpy(ev->cr.bssid, bssid, ETH_ALEN);
 799         if (req_ie_len) {
 800                 ev->cr.req_ie = ((u8 *)ev) + sizeof(*ev);
 801                 ev->cr.req_ie_len = req_ie_len;
 802                 memcpy((void *)ev->cr.req_ie, req_ie, req_ie_len);
 803         }
 804         if (resp_ie_len) {
 805                 ev->cr.resp_ie = ((u8 *)ev) + sizeof(*ev) + req_ie_len;
 806                 ev->cr.resp_ie_len = resp_ie_len;
 807                 memcpy((void *)ev->cr.resp_ie, resp_ie, resp_ie_len);
 808         }
 809         if (bss)
 810                 cfg80211_hold_bss(bss_from_pub(bss));
 811         ev->cr.bss = bss;
 812         ev->cr.status = status;
 813
 814         spin_lock_irqsave(&wdev->event_lock, flags);
 815         list_add_tail(&ev->list, &wdev->event_list);
 816         spin_unlock_irqrestore(&wdev->event_lock, flags);
 817         queue_work(cfg80211_wq, &rdev->event_work);
 818 }
 819 EXPORT_SYMBOL(cfg80211_connect_bss);
 820
 821 /* Consumes bss object one way or another */
 822 void __cfg80211_roamed(struct wireless_dev *wdev,
 823                        struct cfg80211_bss *bss,
 824                        const u8 *req_ie, size_t req_ie_len,
 825                        const u8 *resp_ie, size_t resp_ie_len)
 826 {
 827 #ifdef CONFIG_CFG80211_WEXT
 828         union iwreq_data wrqu;
 829 #endif
 830         ASSERT_WDEV_LOCK(wdev);
 831
 832         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION &&
 833                     wdev->iftype != NL80211_IFTYPE_P2P_CLIENT))
 834                 goto out;
 835
 836         if (WARN_ON(!wdev->current_bss))
 837                 goto out;
 838
 839         cfg80211_unhold_bss(wdev->current_bss);
 840         cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
 841         wdev->current_bss = NULL;
 842
 843         cfg80211_hold_bss(bss_from_pub(bss));
 844         wdev->current_bss = bss_from_pub(bss);
 845
 846         nl80211_send_roamed(wiphy_to_rdev(wdev->wiphy),
 847                             wdev->netdev, bss->bssid,
 848                             req_ie, req_ie_len, resp_ie, resp_ie_len,
 849                             GFP_KERNEL);
 850
 851 #ifdef CONFIG_CFG80211_WEXT
 852         if (req_ie) {
 853                 memset(&wrqu, 0, sizeof(wrqu));
 854                 wrqu.data.length = req_ie_len;
 855                 wireless_send_event(wdev->netdev, IWEVASSOCREQIE,
 856                                     &wrqu, req_ie);
 857         }
 858
 859         if (resp_ie) {
 860                 memset(&wrqu, 0, sizeof(wrqu));
 861                 wrqu.data.length = resp_ie_len;
 862                 wireless_send_event(wdev->netdev, IWEVASSOCRESPIE,
 863                                     &wrqu, resp_ie);
 864         }
 865
 866         memset(&wrqu, 0, sizeof(wrqu));
 867         wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 868         memcpy(wrqu.ap_addr.sa_data, bss->bssid, ETH_ALEN);
 869         memcpy(wdev->wext.prev_bssid, bss->bssid, ETH_ALEN);
 870         wdev->wext.prev_bssid_valid = true;
 871         wireless_send_event(wdev->netdev, SIOCGIWAP, &wrqu, NULL);
 872 #endif
 873
 874         return;
 875 out:
 876         cfg80211_put_bss(wdev->wiphy, bss);
 877 }
 878
 879 void cfg80211_roamed(struct net_device *dev,
 880                      struct ieee80211_channel *channel,
 881                      const u8 *bssid,
 882                      const u8 *req_ie, size_t req_ie_len,
 883                      const u8 *resp_ie, size_t resp_ie_len, gfp_t gfp)
 884 {
 885         struct wireless_dev *wdev = dev->ieee80211_ptr;
 886         struct cfg80211_bss *bss;
 887
 888         bss = cfg80211_get_bss(wdev->wiphy, channel, bssid, wdev->ssid,
 889                                wdev->ssid_len,
 890                                wdev->conn_bss_type, IEEE80211_PRIVACY_ANY);
 891         if (WARN_ON(!bss))
 892                 return;
 893
 894         cfg80211_roamed_bss(dev, bss, req_ie, req_ie_len, resp_ie,
 895                             resp_ie_len, gfp);
 896 }
 897 EXPORT_SYMBOL(cfg80211_roamed);
 898
 899 /* Consumes bss object one way or another */
 900 void cfg80211_roamed_bss(struct net_device *dev,
 901                          struct cfg80211_bss *bss, const u8 *req_ie,
 902                          size_t req_ie_len, const u8 *resp_ie,
 903                          size_t resp_ie_len, gfp_t gfp)
 904 {
 905         struct wireless_dev *wdev = dev->ieee80211_ptr;
 906         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 907         struct cfg80211_event *ev;
 908         unsigned long flags;
 909
 910         if (WARN_ON(!bss))
 911                 return;
 912
 913         ev = kzalloc(sizeof(*ev) + req_ie_len + resp_ie_len, gfp);
 914         if (!ev) {
 915                 cfg80211_put_bss(wdev->wiphy, bss);
 916                 return;
 917         }
 918
 919         ev->type = EVENT_ROAMED;
 920         ev->rm.req_ie = ((u8 *)ev) + sizeof(*ev);
 921         ev->rm.req_ie_len = req_ie_len;
 922         memcpy((void *)ev->rm.req_ie, req_ie, req_ie_len);
 923         ev->rm.resp_ie = ((u8 *)ev) + sizeof(*ev) + req_ie_len;
 924         ev->rm.resp_ie_len = resp_ie_len;
 925         memcpy((void *)ev->rm.resp_ie, resp_ie, resp_ie_len);
 926         ev->rm.bss = bss;
 927
 928         spin_lock_irqsave(&wdev->event_lock, flags);
 929         list_add_tail(&ev->list, &wdev->event_list);
 930         spin_unlock_irqrestore(&wdev->event_lock, flags);
 931         queue_work(cfg80211_wq, &rdev->event_work);
 932 }
 933 EXPORT_SYMBOL(cfg80211_roamed_bss);
 934
 935 void __cfg80211_disconnected(struct net_device *dev, const u8 *ie,
 936                              size_t ie_len, u16 reason, bool from_ap)
 937 {
 938         struct wireless_dev *wdev = dev->ieee80211_ptr;
 939         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 940         int i;
 941 #ifdef CONFIG_CFG80211_WEXT
 942         union iwreq_data wrqu;
 943 #endif
 944
 945         ASSERT_WDEV_LOCK(wdev);
 946
 947         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION &&
 948                     wdev->iftype != NL80211_IFTYPE_P2P_CLIENT))
 949                 return;
 950
 951         if (wdev->current_bss) {
 952                 cfg80211_unhold_bss(wdev->current_bss);
 953                 cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
 954         }
 955
 956         wdev->current_bss = NULL;
 957         wdev->ssid_len = 0;
 958
 959         nl80211_send_disconnected(rdev, dev, reason, ie, ie_len, from_ap);
 960
 961         /* stop critical protocol if supported */
 962         if (rdev->ops->crit_proto_stop && rdev->crit_proto_nlportid) {
 963                 rdev->crit_proto_nlportid = 0;
 964                 rdev_crit_proto_stop(rdev, wdev);
 965         }
 966
 967         /*
 968          * Delete all the keys ... pairwise keys can't really
 969          * exist any more anyway, but default keys might.
 970          */
 971         if (rdev->ops->del_key)
 972                 for (i = 0; i < 6; i++)
 973                         rdev_del_key(rdev, dev, i, false, NULL);
 974
 975         rdev_set_qos_map(rdev, dev, NULL);
 976
 977 #ifdef CONFIG_CFG80211_WEXT
 978         memset(&wrqu, 0, sizeof(wrqu));
 979         wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 980         wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL);
 981         wdev->wext.connect.ssid_len = 0;
 982 #endif
 983
 984         schedule_work(&cfg80211_disconnect_work);
 985 }
 986
 987 void cfg80211_disconnected(struct net_device *dev, u16 reason,
 988                            const u8 *ie, size_t ie_len,
 989                            bool locally_generated, gfp_t gfp)
 990 {
 991         struct wireless_dev *wdev = dev->ieee80211_ptr;
 992         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 993         struct cfg80211_event *ev;
 994         unsigned long flags;
 995
 996         ev = kzalloc(sizeof(*ev) + ie_len, gfp);
 997         if (!ev)
 998                 return;
 999
1000         ev->type = EVENT_DISCONNECTED;
1001         ev->dc.ie = ((u8 *)ev) + sizeof(*ev);
1002         ev->dc.ie_len = ie_len;
1003         memcpy((void *)ev->dc.ie, ie, ie_len);
1004         ev->dc.reason = reason;
1005         ev->dc.locally_generated = locally_generated;
1006
1007         spin_lock_irqsave(&wdev->event_lock, flags);
1008         list_add_tail(&ev->list, &wdev->event_list);
1009         spin_unlock_irqrestore(&wdev->event_lock, flags);
1010         queue_work(cfg80211_wq, &rdev->event_work);
1011 }
1012 EXPORT_SYMBOL(cfg80211_disconnected);
1013
1014 /*
1015  * API calls for nl80211/wext compatibility code
1016  */
1017 int cfg80211_connect(struct cfg80211_registered_device *rdev,
1018                      struct net_device *dev,
1019                      struct cfg80211_connect_params *connect,
1020                      struct cfg80211_cached_keys *connkeys,
1021                      const u8 *prev_bssid)
1022 {
1023         struct wireless_dev *wdev = dev->ieee80211_ptr;
1024         int err;
1025
1026         ASSERT_WDEV_LOCK(wdev);
1027
1028         if (WARN_ON(wdev->connect_keys)) {
1029                 kzfree(wdev->connect_keys);
1030                 wdev->connect_keys = NULL;
1031         }
1032
1033         cfg80211_oper_and_ht_capa(&connect->ht_capa_mask,
1034                                   rdev->wiphy.ht_capa_mod_mask);
1035
1036         if (connkeys && connkeys->def >= 0) {
1037                 int idx;
1038                 u32 cipher;
1039
1040                 idx = connkeys->def;
1041                 cipher = connkeys->params[idx].cipher;
1042                 /* If given a WEP key we may need it for shared key auth */
1043                 if (cipher == WLAN_CIPHER_SUITE_WEP40 ||
1044                     cipher == WLAN_CIPHER_SUITE_WEP104) {
1045                         connect->key_idx = idx;
1046                         connect->key = connkeys->params[idx].key;
1047                         connect->key_len = connkeys->params[idx].key_len;
1048
1049                         /*
1050                          * If ciphers are not set (e.g. when going through
1051                          * iwconfig), we have to set them appropriately here.
1052                          */
1053                         if (connect->crypto.cipher_group == 0)
1054                                 connect->crypto.cipher_group = cipher;
1055
1056                         if (connect->crypto.n_ciphers_pairwise == 0) {
1057                                 connect->crypto.n_ciphers_pairwise = 1;
1058                                 connect->crypto.ciphers_pairwise[0] = cipher;
1059                         }
1060                 }
1061
1062                 connect->crypto.wep_keys = connkeys->params;
1063                 connect->crypto.wep_tx_key = connkeys->def;
1064         } else {
1065                 if (WARN_ON(connkeys))
1066                         return -EINVAL;
1067         }
1068
1069         wdev->connect_keys = connkeys;
1070         memcpy(wdev->ssid, connect->ssid, connect->ssid_len);
1071         wdev->ssid_len = connect->ssid_len;
1072
1073         wdev->conn_bss_type = connect->pbss ? IEEE80211_BSS_TYPE_PBSS :
1074                                               IEEE80211_BSS_TYPE_ESS;
1075
1076         if (!rdev->ops->connect)
1077                 err = cfg80211_sme_connect(wdev, connect, prev_bssid);
1078         else
1079                 err = rdev_connect(rdev, dev, connect);
1080
1081         if (err) {
1082                 wdev->connect_keys = NULL;
1083                 wdev->ssid_len = 0;
1084                 return err;
1085         }
1086
1087         return 0;
1088 }
1089
1090 int cfg80211_disconnect(struct cfg80211_registered_device *rdev,
1091                         struct net_device *dev, u16 reason, bool wextev)
1092 {
1093         struct wireless_dev *wdev = dev->ieee80211_ptr;
1094         int err = 0;
1095
1096         ASSERT_WDEV_LOCK(wdev);
1097
1098         kzfree(wdev->connect_keys);
1099         wdev->connect_keys = NULL;
1100
1101         if (wdev->conn)
1102                 err = cfg80211_sme_disconnect(wdev, reason);
1103         else if (!rdev->ops->disconnect)
1104                 cfg80211_mlme_down(rdev, dev);
1105         else if (wdev->ssid_len)
1106                 err = rdev_disconnect(rdev, dev, reason);
1107
1108         return err;
1109 }