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                 cfg80211_unhold_bss(wdev->current_bss);
 509                 cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
 510                 wdev->current_bss = NULL;
 511
 512                 cfg80211_sme_free(wdev);
 513         }
 514
 515         if (wdev->conn)
 516                 return -EINPROGRESS;
 517
 518         wdev->conn = kzalloc(sizeof(*wdev->conn), GFP_KERNEL);
 519         if (!wdev->conn)
 520                 return -ENOMEM;
 521
 522         /*
 523          * Copy all parameters, and treat explicitly IEs, BSSID, SSID.
 524          */
 525         memcpy(&wdev->conn->params, connect, sizeof(*connect));
 526         if (connect->bssid) {
 527                 wdev->conn->params.bssid = wdev->conn->bssid;
 528                 memcpy(wdev->conn->bssid, connect->bssid, ETH_ALEN);
 529         }
 530
 531         if (cfg80211_sme_get_conn_ies(wdev, connect->ie, connect->ie_len,
 532                                       &wdev->conn->ie,
 533                                       &wdev->conn->params.ie_len)) {
 534                 kfree(wdev->conn);
 535                 wdev->conn = NULL;
 536                 return -ENOMEM;
 537         }
 538         wdev->conn->params.ie = wdev->conn->ie;
 539
 540         if (connect->auth_type == NL80211_AUTHTYPE_AUTOMATIC) {
 541                 wdev->conn->auto_auth = true;
 542                 /* start with open system ... should mostly work */
 543                 wdev->conn->params.auth_type =
 544                         NL80211_AUTHTYPE_OPEN_SYSTEM;
 545         } else {
 546                 wdev->conn->auto_auth = false;
 547         }
 548
 549         wdev->conn->params.ssid = wdev->ssid;
 550         wdev->conn->params.ssid_len = wdev->ssid_len;
 551
 552         /* see if we have the bss already */
 553         bss = cfg80211_get_conn_bss(wdev);
 554
 555         if (prev_bssid) {
 556                 memcpy(wdev->conn->prev_bssid, prev_bssid, ETH_ALEN);
 557                 wdev->conn->prev_bssid_valid = true;
 558         }
 559
 560         /* we're good if we have a matching bss struct */
 561         if (bss) {
 562                 err = cfg80211_conn_do_work(wdev);
 563                 cfg80211_put_bss(wdev->wiphy, bss);
 564         } else {
 565                 /* otherwise we'll need to scan for the AP first */
 566                 err = cfg80211_conn_scan(wdev);
 567
 568                 /*
 569                  * If we can't scan right now, then we need to scan again
 570                  * after the current scan finished, since the parameters
 571                  * changed (unless we find a good AP anyway).
 572                  */
 573                 if (err == -EBUSY) {
 574                         err = 0;
 575                         wdev->conn->state = CFG80211_CONN_SCAN_AGAIN;
 576                 }
 577         }
 578
 579         if (err)
 580                 cfg80211_sme_free(wdev);
 581
 582         return err;
 583 }
 584
 585 static int cfg80211_sme_disconnect(struct wireless_dev *wdev, u16 reason)
 586 {
 587         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 588         int err;
 589
 590         if (!wdev->conn)
 591                 return 0;
 592
 593         if (!rdev->ops->deauth)
 594                 return -EOPNOTSUPP;
 595
 596         if (wdev->conn->state == CFG80211_CONN_SCANNING ||
 597             wdev->conn->state == CFG80211_CONN_SCAN_AGAIN) {
 598                 err = 0;
 599                 goto out;
 600         }
 601
 602         /* wdev->conn->params.bssid must be set if > SCANNING */
 603         err = cfg80211_mlme_deauth(rdev, wdev->netdev,
 604                                    wdev->conn->params.bssid,
 605                                    NULL, 0, reason, false);
 606  out:
 607         cfg80211_sme_free(wdev);
 608         return err;
 609 }
 610
 611 /*
 612  * code shared for in-device and software SME
 613  */
 614
 615 static bool cfg80211_is_all_idle(void)
 616 {
 617         struct cfg80211_registered_device *rdev;
 618         struct wireless_dev *wdev;
 619         bool is_all_idle = true;
 620
 621         /*
 622          * All devices must be idle as otherwise if you are actively
 623          * scanning some new beacon hints could be learned and would
 624          * count as new regulatory hints.
 625          */
 626         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
 627                 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
 628                         wdev_lock(wdev);
 629                         if (wdev->conn || wdev->current_bss)
 630                                 is_all_idle = false;
 631                         wdev_unlock(wdev);
 632                 }
 633         }
 634
 635         return is_all_idle;
 636 }
 637
 638 static void disconnect_work(struct work_struct *work)
 639 {
 640         rtnl_lock();
 641         if (cfg80211_is_all_idle())
 642                 regulatory_hint_disconnect();
 643         rtnl_unlock();
 644 }
 645
 646 static DECLARE_WORK(cfg80211_disconnect_work, disconnect_work);
 647
 648
 649 /*
 650  * API calls for drivers implementing connect/disconnect and
 651  * SME event handling
 652  */
 653
 654 /* This method must consume bss one way or another */
 655 void __cfg80211_connect_result(struct net_device *dev, const u8 *bssid,
 656                                const u8 *req_ie, size_t req_ie_len,
 657                                const u8 *resp_ie, size_t resp_ie_len,
 658                                int status, bool wextev,
 659                                struct cfg80211_bss *bss)
 660 {
 661         struct wireless_dev *wdev = dev->ieee80211_ptr;
 662         const u8 *country_ie;
 663 #ifdef CONFIG_CFG80211_WEXT
 664         union iwreq_data wrqu;
 665 #endif
 666
 667         ASSERT_WDEV_LOCK(wdev);
 668
 669         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION &&
 670                     wdev->iftype != NL80211_IFTYPE_P2P_CLIENT)) {
 671                 cfg80211_put_bss(wdev->wiphy, bss);
 672                 return;
 673         }
 674
 675         nl80211_send_connect_result(wiphy_to_rdev(wdev->wiphy), dev,
 676                                     bssid, req_ie, req_ie_len,
 677                                     resp_ie, resp_ie_len,
 678                                     status, GFP_KERNEL);
 679
 680 #ifdef CONFIG_CFG80211_WEXT
 681         if (wextev) {
 682                 if (req_ie && status == WLAN_STATUS_SUCCESS) {
 683                         memset(&wrqu, 0, sizeof(wrqu));
 684                         wrqu.data.length = req_ie_len;
 685                         wireless_send_event(dev, IWEVASSOCREQIE, &wrqu, req_ie);
 686                 }
 687
 688                 if (resp_ie && status == WLAN_STATUS_SUCCESS) {
 689                         memset(&wrqu, 0, sizeof(wrqu));
 690                         wrqu.data.length = resp_ie_len;
 691                         wireless_send_event(dev, IWEVASSOCRESPIE, &wrqu, resp_ie);
 692                 }
 693
 694                 memset(&wrqu, 0, sizeof(wrqu));
 695                 wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 696                 if (bssid && status == WLAN_STATUS_SUCCESS) {
 697                         memcpy(wrqu.ap_addr.sa_data, bssid, ETH_ALEN);
 698                         memcpy(wdev->wext.prev_bssid, bssid, ETH_ALEN);
 699                         wdev->wext.prev_bssid_valid = true;
 700                 }
 701                 wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL);
 702         }
 703 #endif
 704
 705         if (!bss && (status == WLAN_STATUS_SUCCESS)) {
 706                 WARN_ON_ONCE(!wiphy_to_rdev(wdev->wiphy)->ops->connect);
 707                 bss = cfg80211_get_bss(wdev->wiphy, NULL, bssid,
 708                                        wdev->ssid, wdev->ssid_len,
 709                                        wdev->conn_bss_type,
 710                                        IEEE80211_PRIVACY_ANY);
 711                 if (bss)
 712                         cfg80211_hold_bss(bss_from_pub(bss));
 713         }
 714
 715         if (wdev->current_bss) {
 716                 cfg80211_unhold_bss(wdev->current_bss);
 717                 cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
 718                 wdev->current_bss = NULL;
 719         }
 720
 721         if (status != WLAN_STATUS_SUCCESS) {
 722                 kzfree(wdev->connect_keys);
 723                 wdev->connect_keys = NULL;
 724                 wdev->ssid_len = 0;
 725                 if (bss) {
 726                         cfg80211_unhold_bss(bss_from_pub(bss));
 727                         cfg80211_put_bss(wdev->wiphy, bss);
 728                 }
 729                 cfg80211_sme_free(wdev);
 730                 return;
 731         }
 732
 733         if (WARN_ON(!bss))
 734                 return;
 735
 736         wdev->current_bss = bss_from_pub(bss);
 737
 738         if (!(wdev->wiphy->flags & WIPHY_FLAG_HAS_STATIC_WEP))
 739                 cfg80211_upload_connect_keys(wdev);
 740
 741         rcu_read_lock();
 742         country_ie = ieee80211_bss_get_ie(bss, WLAN_EID_COUNTRY);
 743         if (!country_ie) {
 744                 rcu_read_unlock();
 745                 return;
 746         }
 747
 748         country_ie = kmemdup(country_ie, 2 + country_ie[1], GFP_ATOMIC);
 749         rcu_read_unlock();
 750
 751         if (!country_ie)
 752                 return;
 753
 754         /*
 755          * ieee80211_bss_get_ie() ensures we can access:
 756          * - country_ie + 2, the start of the country ie data, and
 757          * - and country_ie[1] which is the IE length
 758          */
 759         regulatory_hint_country_ie(wdev->wiphy, bss->channel->band,
 760                                    country_ie + 2, country_ie[1]);
 761         kfree(country_ie);
 762 }
 763
 764 /* Consumes bss object one way or another */
 765 void cfg80211_connect_bss(struct net_device *dev, const u8 *bssid,
 766                           struct cfg80211_bss *bss, const u8 *req_ie,
 767                           size_t req_ie_len, const u8 *resp_ie,
 768                           size_t resp_ie_len, int status, gfp_t gfp)
 769 {
 770         struct wireless_dev *wdev = dev->ieee80211_ptr;
 771         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 772         struct cfg80211_event *ev;
 773         unsigned long flags;
 774
 775         if (bss) {
 776                 /* Make sure the bss entry provided by the driver is valid. */
 777                 struct cfg80211_internal_bss *ibss = bss_from_pub(bss);
 778
 779                 if (WARN_ON(list_empty(&ibss->list))) {
 780                         cfg80211_put_bss(wdev->wiphy, bss);
 781                         return;
 782                 }
 783         }
 784
 785         ev = kzalloc(sizeof(*ev) + req_ie_len + resp_ie_len, gfp);
 786         if (!ev) {
 787                 cfg80211_put_bss(wdev->wiphy, bss);
 788                 return;
 789         }
 790
 791         ev->type = EVENT_CONNECT_RESULT;
 792         if (bssid)
 793                 memcpy(ev->cr.bssid, bssid, ETH_ALEN);
 794         if (req_ie_len) {
 795                 ev->cr.req_ie = ((u8 *)ev) + sizeof(*ev);
 796                 ev->cr.req_ie_len = req_ie_len;
 797                 memcpy((void *)ev->cr.req_ie, req_ie, req_ie_len);
 798         }
 799         if (resp_ie_len) {
 800                 ev->cr.resp_ie = ((u8 *)ev) + sizeof(*ev) + req_ie_len;
 801                 ev->cr.resp_ie_len = resp_ie_len;
 802                 memcpy((void *)ev->cr.resp_ie, resp_ie, resp_ie_len);
 803         }
 804         if (bss)
 805                 cfg80211_hold_bss(bss_from_pub(bss));
 806         ev->cr.bss = bss;
 807         ev->cr.status = status;
 808
 809         spin_lock_irqsave(&wdev->event_lock, flags);
 810         list_add_tail(&ev->list, &wdev->event_list);
 811         spin_unlock_irqrestore(&wdev->event_lock, flags);
 812         queue_work(cfg80211_wq, &rdev->event_work);
 813 }
 814 EXPORT_SYMBOL(cfg80211_connect_bss);
 815
 816 /* Consumes bss object one way or another */
 817 void __cfg80211_roamed(struct wireless_dev *wdev,
 818                        struct cfg80211_bss *bss,
 819                        const u8 *req_ie, size_t req_ie_len,
 820                        const u8 *resp_ie, size_t resp_ie_len)
 821 {
 822 #ifdef CONFIG_CFG80211_WEXT
 823         union iwreq_data wrqu;
 824 #endif
 825         ASSERT_WDEV_LOCK(wdev);
 826
 827         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION &&
 828                     wdev->iftype != NL80211_IFTYPE_P2P_CLIENT))
 829                 goto out;
 830
 831         if (WARN_ON(!wdev->current_bss))
 832                 goto out;
 833
 834         cfg80211_unhold_bss(wdev->current_bss);
 835         cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
 836         wdev->current_bss = NULL;
 837
 838         cfg80211_hold_bss(bss_from_pub(bss));
 839         wdev->current_bss = bss_from_pub(bss);
 840
 841         nl80211_send_roamed(wiphy_to_rdev(wdev->wiphy),
 842                             wdev->netdev, bss->bssid,
 843                             req_ie, req_ie_len, resp_ie, resp_ie_len,
 844                             GFP_KERNEL);
 845
 846 #ifdef CONFIG_CFG80211_WEXT
 847         if (req_ie) {
 848                 memset(&wrqu, 0, sizeof(wrqu));
 849                 wrqu.data.length = req_ie_len;
 850                 wireless_send_event(wdev->netdev, IWEVASSOCREQIE,
 851                                     &wrqu, req_ie);
 852         }
 853
 854         if (resp_ie) {
 855                 memset(&wrqu, 0, sizeof(wrqu));
 856                 wrqu.data.length = resp_ie_len;
 857                 wireless_send_event(wdev->netdev, IWEVASSOCRESPIE,
 858                                     &wrqu, resp_ie);
 859         }
 860
 861         memset(&wrqu, 0, sizeof(wrqu));
 862         wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 863         memcpy(wrqu.ap_addr.sa_data, bss->bssid, ETH_ALEN);
 864         memcpy(wdev->wext.prev_bssid, bss->bssid, ETH_ALEN);
 865         wdev->wext.prev_bssid_valid = true;
 866         wireless_send_event(wdev->netdev, SIOCGIWAP, &wrqu, NULL);
 867 #endif
 868
 869         return;
 870 out:
 871         cfg80211_put_bss(wdev->wiphy, bss);
 872 }
 873
 874 void cfg80211_roamed(struct net_device *dev,
 875                      struct ieee80211_channel *channel,
 876                      const u8 *bssid,
 877                      const u8 *req_ie, size_t req_ie_len,
 878                      const u8 *resp_ie, size_t resp_ie_len, gfp_t gfp)
 879 {
 880         struct wireless_dev *wdev = dev->ieee80211_ptr;
 881         struct cfg80211_bss *bss;
 882
 883         bss = cfg80211_get_bss(wdev->wiphy, channel, bssid, wdev->ssid,
 884                                wdev->ssid_len,
 885                                wdev->conn_bss_type, IEEE80211_PRIVACY_ANY);
 886         if (WARN_ON(!bss))
 887                 return;
 888
 889         cfg80211_roamed_bss(dev, bss, req_ie, req_ie_len, resp_ie,
 890                             resp_ie_len, gfp);
 891 }
 892 EXPORT_SYMBOL(cfg80211_roamed);
 893
 894 /* Consumes bss object one way or another */
 895 void cfg80211_roamed_bss(struct net_device *dev,
 896                          struct cfg80211_bss *bss, const u8 *req_ie,
 897                          size_t req_ie_len, const u8 *resp_ie,
 898                          size_t resp_ie_len, gfp_t gfp)
 899 {
 900         struct wireless_dev *wdev = dev->ieee80211_ptr;
 901         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 902         struct cfg80211_event *ev;
 903         unsigned long flags;
 904
 905         if (WARN_ON(!bss))
 906                 return;
 907
 908         ev = kzalloc(sizeof(*ev) + req_ie_len + resp_ie_len, gfp);
 909         if (!ev) {
 910                 cfg80211_put_bss(wdev->wiphy, bss);
 911                 return;
 912         }
 913
 914         ev->type = EVENT_ROAMED;
 915         ev->rm.req_ie = ((u8 *)ev) + sizeof(*ev);
 916         ev->rm.req_ie_len = req_ie_len;
 917         memcpy((void *)ev->rm.req_ie, req_ie, req_ie_len);
 918         ev->rm.resp_ie = ((u8 *)ev) + sizeof(*ev) + req_ie_len;
 919         ev->rm.resp_ie_len = resp_ie_len;
 920         memcpy((void *)ev->rm.resp_ie, resp_ie, resp_ie_len);
 921         ev->rm.bss = bss;
 922
 923         spin_lock_irqsave(&wdev->event_lock, flags);
 924         list_add_tail(&ev->list, &wdev->event_list);
 925         spin_unlock_irqrestore(&wdev->event_lock, flags);
 926         queue_work(cfg80211_wq, &rdev->event_work);
 927 }
 928 EXPORT_SYMBOL(cfg80211_roamed_bss);
 929
 930 void __cfg80211_disconnected(struct net_device *dev, const u8 *ie,
 931                              size_t ie_len, u16 reason, bool from_ap)
 932 {
 933         struct wireless_dev *wdev = dev->ieee80211_ptr;
 934         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 935         int i;
 936 #ifdef CONFIG_CFG80211_WEXT
 937         union iwreq_data wrqu;
 938 #endif
 939
 940         ASSERT_WDEV_LOCK(wdev);
 941
 942         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION &&
 943                     wdev->iftype != NL80211_IFTYPE_P2P_CLIENT))
 944                 return;
 945
 946         if (wdev->current_bss) {
 947                 cfg80211_unhold_bss(wdev->current_bss);
 948                 cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
 949         }
 950
 951         wdev->current_bss = NULL;
 952         wdev->ssid_len = 0;
 953
 954         nl80211_send_disconnected(rdev, dev, reason, ie, ie_len, from_ap);
 955
 956         /* stop critical protocol if supported */
 957         if (rdev->ops->crit_proto_stop && rdev->crit_proto_nlportid) {
 958                 rdev->crit_proto_nlportid = 0;
 959                 rdev_crit_proto_stop(rdev, wdev);
 960         }
 961
 962         /*
 963          * Delete all the keys ... pairwise keys can't really
 964          * exist any more anyway, but default keys might.
 965          */
 966         if (rdev->ops->del_key)
 967                 for (i = 0; i < 6; i++)
 968                         rdev_del_key(rdev, dev, i, false, NULL);
 969
 970         rdev_set_qos_map(rdev, dev, NULL);
 971
 972 #ifdef CONFIG_CFG80211_WEXT
 973         memset(&wrqu, 0, sizeof(wrqu));
 974         wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 975         wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL);
 976         wdev->wext.connect.ssid_len = 0;
 977 #endif
 978
 979         schedule_work(&cfg80211_disconnect_work);
 980 }
 981
 982 void cfg80211_disconnected(struct net_device *dev, u16 reason,
 983                            const u8 *ie, size_t ie_len,
 984                            bool locally_generated, gfp_t gfp)
 985 {
 986         struct wireless_dev *wdev = dev->ieee80211_ptr;
 987         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 988         struct cfg80211_event *ev;
 989         unsigned long flags;
 990
 991         ev = kzalloc(sizeof(*ev) + ie_len, gfp);
 992         if (!ev)
 993                 return;
 994
 995         ev->type = EVENT_DISCONNECTED;
 996         ev->dc.ie = ((u8 *)ev) + sizeof(*ev);
 997         ev->dc.ie_len = ie_len;
 998         memcpy((void *)ev->dc.ie, ie, ie_len);
 999         ev->dc.reason = reason;
1000         ev->dc.locally_generated = locally_generated;
1001
1002         spin_lock_irqsave(&wdev->event_lock, flags);
1003         list_add_tail(&ev->list, &wdev->event_list);
1004         spin_unlock_irqrestore(&wdev->event_lock, flags);
1005         queue_work(cfg80211_wq, &rdev->event_work);
1006 }
1007 EXPORT_SYMBOL(cfg80211_disconnected);
1008
1009 /*
1010  * API calls for nl80211/wext compatibility code
1011  */
1012 int cfg80211_connect(struct cfg80211_registered_device *rdev,
1013                      struct net_device *dev,
1014                      struct cfg80211_connect_params *connect,
1015                      struct cfg80211_cached_keys *connkeys,
1016                      const u8 *prev_bssid)
1017 {
1018         struct wireless_dev *wdev = dev->ieee80211_ptr;
1019         int err;
1020
1021         ASSERT_WDEV_LOCK(wdev);
1022
1023         /*
1024          * If we have an ssid_len, we're trying to connect or are
1025          * already connected, so reject a new SSID unless it's the
1026          * same (which is the case for re-association.)
1027          */
1028         if (wdev->ssid_len &&
1029             (wdev->ssid_len != connect->ssid_len ||
1030              memcmp(wdev->ssid, connect->ssid, wdev->ssid_len)))
1031                 return -EALREADY;
1032
1033         /*
1034          * If connected, reject (re-)association unless prev_bssid
1035          * matches the current BSSID.
1036          */
1037         if (wdev->current_bss) {
1038                 if (!prev_bssid)
1039                         return -EALREADY;
1040                 if (!ether_addr_equal(prev_bssid, wdev->current_bss->pub.bssid))
1041                         return -ENOTCONN;
1042         }
1043
1044         /*
1045          * Reject if we're in the process of connecting with WEP,
1046          * this case isn't very interesting and trying to handle
1047          * it would make the code much more complex.
1048          */
1049         if (wdev->connect_keys)
1050                 return -EINPROGRESS;
1051
1052         cfg80211_oper_and_ht_capa(&connect->ht_capa_mask,
1053                                   rdev->wiphy.ht_capa_mod_mask);
1054
1055         if (connkeys && connkeys->def >= 0) {
1056                 int idx;
1057                 u32 cipher;
1058
1059                 idx = connkeys->def;
1060                 cipher = connkeys->params[idx].cipher;
1061                 /* If given a WEP key we may need it for shared key auth */
1062                 if (cipher == WLAN_CIPHER_SUITE_WEP40 ||
1063                     cipher == WLAN_CIPHER_SUITE_WEP104) {
1064                         connect->key_idx = idx;
1065                         connect->key = connkeys->params[idx].key;
1066                         connect->key_len = connkeys->params[idx].key_len;
1067
1068                         /*
1069                          * If ciphers are not set (e.g. when going through
1070                          * iwconfig), we have to set them appropriately here.
1071                          */
1072                         if (connect->crypto.cipher_group == 0)
1073                                 connect->crypto.cipher_group = cipher;
1074
1075                         if (connect->crypto.n_ciphers_pairwise == 0) {
1076                                 connect->crypto.n_ciphers_pairwise = 1;
1077                                 connect->crypto.ciphers_pairwise[0] = cipher;
1078                         }
1079                 }
1080
1081                 connect->crypto.wep_keys = connkeys->params;
1082                 connect->crypto.wep_tx_key = connkeys->def;
1083         } else {
1084                 if (WARN_ON(connkeys))
1085                         return -EINVAL;
1086         }
1087
1088         wdev->connect_keys = connkeys;
1089         memcpy(wdev->ssid, connect->ssid, connect->ssid_len);
1090         wdev->ssid_len = connect->ssid_len;
1091
1092         wdev->conn_bss_type = connect->pbss ? IEEE80211_BSS_TYPE_PBSS :
1093                                               IEEE80211_BSS_TYPE_ESS;
1094
1095         if (!rdev->ops->connect)
1096                 err = cfg80211_sme_connect(wdev, connect, prev_bssid);
1097         else
1098                 err = rdev_connect(rdev, dev, connect);
1099
1100         if (err) {
1101                 wdev->connect_keys = NULL;
1102                 /*
1103                  * This could be reassoc getting refused, don't clear
1104                  * ssid_len in that case.
1105                  */
1106                 if (!wdev->current_bss)
1107                         wdev->ssid_len = 0;
1108                 return err;
1109         }
1110
1111         return 0;
1112 }
1113
1114 int cfg80211_disconnect(struct cfg80211_registered_device *rdev,
1115                         struct net_device *dev, u16 reason, bool wextev)
1116 {
1117         struct wireless_dev *wdev = dev->ieee80211_ptr;
1118         int err = 0;
1119
1120         ASSERT_WDEV_LOCK(wdev);
1121
1122         kzfree(wdev->connect_keys);
1123         wdev->connect_keys = NULL;
1124
1125         if (wdev->conn)
1126                 err = cfg80211_sme_disconnect(wdev, reason);
1127         else if (!rdev->ops->disconnect)
1128                 cfg80211_mlme_down(rdev, dev);
1129         else if (wdev->current_bss)
1130                 err = rdev_disconnect(rdev, dev, reason);
1131
1132         /*
1133          * Clear ssid_len unless we actually were fully connected,
1134          * in which case cfg80211_disconnected() will take care of
1135          * this later.
1136          */
1137         if (!wdev->current_bss)
1138                 wdev->ssid_len = 0;
1139
1140         return err;
1141 }