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_CONNECTED,
  43         } state;
  44         u8 bssid[ETH_ALEN], prev_bssid[ETH_ALEN];
  45         const u8 *ie;
  46         size_t ie_len;
  47         bool auto_auth, prev_bssid_valid;
  48 };
  49
  50 static void cfg80211_sme_free(struct wireless_dev *wdev)
  51 {
  52         if (!wdev->conn)
  53                 return;
  54
  55         kfree(wdev->conn->ie);
  56         kfree(wdev->conn);
  57         wdev->conn = NULL;
  58 }
  59
  60 static int cfg80211_conn_scan(struct wireless_dev *wdev)
  61 {
  62         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
  63         struct cfg80211_scan_request *request;
  64         int n_channels, err;
  65
  66         ASSERT_RTNL();
  67         ASSERT_WDEV_LOCK(wdev);
  68
  69         if (rdev->scan_req || rdev->scan_msg)
  70                 return -EBUSY;
  71
  72         if (wdev->conn->params.channel)
  73                 n_channels = 1;
  74         else
  75                 n_channels = ieee80211_get_num_supported_channels(wdev->wiphy);
  76
  77         request = kzalloc(sizeof(*request) + sizeof(request->ssids[0]) +
  78                           sizeof(request->channels[0]) * n_channels,
  79                           GFP_KERNEL);
  80         if (!request)
  81                 return -ENOMEM;
  82
  83         if (wdev->conn->params.channel) {
  84                 enum nl80211_band band = wdev->conn->params.channel->band;
  85                 struct ieee80211_supported_band *sband =
  86                         wdev->wiphy->bands[band];
  87
  88                 if (!sband) {
  89                         kfree(request);
  90                         return -EINVAL;
  91                 }
  92                 request->channels[0] = wdev->conn->params.channel;
  93                 request->rates[band] = (1 << sband->n_bitrates) - 1;
  94         } else {
  95                 int i = 0, j;
  96                 enum nl80211_band band;
  97                 struct ieee80211_supported_band *bands;
  98                 struct ieee80211_channel *channel;
  99
 100                 for (band = 0; band < NUM_NL80211_BANDS; band++) {
 101                         bands = wdev->wiphy->bands[band];
 102                         if (!bands)
 103                                 continue;
 104                         for (j = 0; j < bands->n_channels; j++) {
 105                                 channel = &bands->channels[j];
 106                                 if (channel->flags & IEEE80211_CHAN_DISABLED)
 107                                         continue;
 108                                 request->channels[i++] = channel;
 109                         }
 110                         request->rates[band] = (1 << bands->n_bitrates) - 1;
 111                 }
 112                 n_channels = i;
 113         }
 114         request->n_channels = n_channels;
 115         request->ssids = (void *)&request->channels[n_channels];
 116         request->n_ssids = 1;
 117
 118         memcpy(request->ssids[0].ssid, wdev->conn->params.ssid,
 119                 wdev->conn->params.ssid_len);
 120         request->ssids[0].ssid_len = wdev->conn->params.ssid_len;
 121
 122         eth_broadcast_addr(request->bssid);
 123
 124         request->wdev = wdev;
 125         request->wiphy = &rdev->wiphy;
 126         request->scan_start = jiffies;
 127
 128         rdev->scan_req = request;
 129
 130         err = rdev_scan(rdev, request);
 131         if (!err) {
 132                 wdev->conn->state = CFG80211_CONN_SCANNING;
 133                 nl80211_send_scan_start(rdev, wdev);
 134                 dev_hold(wdev->netdev);
 135         } else {
 136                 rdev->scan_req = NULL;
 137                 kfree(request);
 138         }
 139         return err;
 140 }
 141
 142 static int cfg80211_conn_do_work(struct wireless_dev *wdev)
 143 {
 144         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 145         struct cfg80211_connect_params *params;
 146         struct cfg80211_assoc_request req = {};
 147         int err;
 148
 149         ASSERT_WDEV_LOCK(wdev);
 150
 151         if (!wdev->conn)
 152                 return 0;
 153
 154         params = &wdev->conn->params;
 155
 156         switch (wdev->conn->state) {
 157         case CFG80211_CONN_SCANNING:
 158                 /* didn't find it during scan ... */
 159                 return -ENOENT;
 160         case CFG80211_CONN_SCAN_AGAIN:
 161                 return cfg80211_conn_scan(wdev);
 162         case CFG80211_CONN_AUTHENTICATE_NEXT:
 163                 if (WARN_ON(!rdev->ops->auth))
 164                         return -EOPNOTSUPP;
 165                 wdev->conn->state = CFG80211_CONN_AUTHENTICATING;
 166                 return cfg80211_mlme_auth(rdev, wdev->netdev,
 167                                           params->channel, params->auth_type,
 168                                           params->bssid,
 169                                           params->ssid, params->ssid_len,
 170                                           NULL, 0,
 171                                           params->key, params->key_len,
 172                                           params->key_idx, NULL, 0);
 173         case CFG80211_CONN_AUTH_FAILED:
 174                 return -ENOTCONN;
 175         case CFG80211_CONN_ASSOCIATE_NEXT:
 176                 if (WARN_ON(!rdev->ops->assoc))
 177                         return -EOPNOTSUPP;
 178                 wdev->conn->state = CFG80211_CONN_ASSOCIATING;
 179                 if (wdev->conn->prev_bssid_valid)
 180                         req.prev_bssid = wdev->conn->prev_bssid;
 181                 req.ie = params->ie;
 182                 req.ie_len = params->ie_len;
 183                 req.use_mfp = params->mfp != NL80211_MFP_NO;
 184                 req.crypto = params->crypto;
 185                 req.flags = params->flags;
 186                 req.ht_capa = params->ht_capa;
 187                 req.ht_capa_mask = params->ht_capa_mask;
 188                 req.vht_capa = params->vht_capa;
 189                 req.vht_capa_mask = params->vht_capa_mask;
 190
 191                 err = cfg80211_mlme_assoc(rdev, wdev->netdev, params->channel,
 192                                           params->bssid, params->ssid,
 193                                           params->ssid_len, &req);
 194                 if (err)
 195                         cfg80211_mlme_deauth(rdev, wdev->netdev, params->bssid,
 196                                              NULL, 0,
 197                                              WLAN_REASON_DEAUTH_LEAVING,
 198                                              false);
 199                 return err;
 200         case CFG80211_CONN_ASSOC_FAILED:
 201                 cfg80211_mlme_deauth(rdev, wdev->netdev, params->bssid,
 202                                      NULL, 0,
 203                                      WLAN_REASON_DEAUTH_LEAVING, false);
 204                 return -ENOTCONN;
 205         case CFG80211_CONN_DEAUTH:
 206                 cfg80211_mlme_deauth(rdev, wdev->netdev, params->bssid,
 207                                      NULL, 0,
 208                                      WLAN_REASON_DEAUTH_LEAVING, false);
 209                 /* free directly, disconnected event already sent */
 210                 cfg80211_sme_free(wdev);
 211                 return 0;
 212         default:
 213                 return 0;
 214         }
 215 }
 216
 217 void cfg80211_conn_work(struct work_struct *work)
 218 {
 219         struct cfg80211_registered_device *rdev =
 220                 container_of(work, struct cfg80211_registered_device, conn_work);
 221         struct wireless_dev *wdev;
 222         u8 bssid_buf[ETH_ALEN], *bssid = NULL;
 223
 224         rtnl_lock();
 225
 226         list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
 227                 if (!wdev->netdev)
 228                         continue;
 229
 230                 wdev_lock(wdev);
 231                 if (!netif_running(wdev->netdev)) {
 232                         wdev_unlock(wdev);
 233                         continue;
 234                 }
 235                 if (!wdev->conn ||
 236                     wdev->conn->state == CFG80211_CONN_CONNECTED) {
 237                         wdev_unlock(wdev);
 238                         continue;
 239                 }
 240                 if (wdev->conn->params.bssid) {
 241                         memcpy(bssid_buf, wdev->conn->params.bssid, ETH_ALEN);
 242                         bssid = bssid_buf;
 243                 }
 244                 if (cfg80211_conn_do_work(wdev)) {
 245                         __cfg80211_connect_result(
 246                                         wdev->netdev, bssid,
 247                                         NULL, 0, NULL, 0, -1, false, NULL);
 248                 }
 249                 wdev_unlock(wdev);
 250         }
 251
 252         rtnl_unlock();
 253 }
 254
 255 /* Returned bss is reference counted and must be cleaned up appropriately. */
 256 static struct cfg80211_bss *cfg80211_get_conn_bss(struct wireless_dev *wdev)
 257 {
 258         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 259         struct cfg80211_bss *bss;
 260
 261         ASSERT_WDEV_LOCK(wdev);
 262
 263         bss = cfg80211_get_bss(wdev->wiphy, wdev->conn->params.channel,
 264                                wdev->conn->params.bssid,
 265                                wdev->conn->params.ssid,
 266                                wdev->conn->params.ssid_len,
 267                                wdev->conn_bss_type,
 268                                IEEE80211_PRIVACY(wdev->conn->params.privacy));
 269         if (!bss)
 270                 return NULL;
 271
 272         memcpy(wdev->conn->bssid, bss->bssid, ETH_ALEN);
 273         wdev->conn->params.bssid = wdev->conn->bssid;
 274         wdev->conn->params.channel = bss->channel;
 275         wdev->conn->state = CFG80211_CONN_AUTHENTICATE_NEXT;
 276         schedule_work(&rdev->conn_work);
 277
 278         return bss;
 279 }
 280
 281 static void __cfg80211_sme_scan_done(struct net_device *dev)
 282 {
 283         struct wireless_dev *wdev = dev->ieee80211_ptr;
 284         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 285         struct cfg80211_bss *bss;
 286
 287         ASSERT_WDEV_LOCK(wdev);
 288
 289         if (!wdev->conn)
 290                 return;
 291
 292         if (wdev->conn->state != CFG80211_CONN_SCANNING &&
 293             wdev->conn->state != CFG80211_CONN_SCAN_AGAIN)
 294                 return;
 295
 296         bss = cfg80211_get_conn_bss(wdev);
 297         if (bss)
 298                 cfg80211_put_bss(&rdev->wiphy, bss);
 299         else
 300                 schedule_work(&rdev->conn_work);
 301 }
 302
 303 void cfg80211_sme_scan_done(struct net_device *dev)
 304 {
 305         struct wireless_dev *wdev = dev->ieee80211_ptr;
 306
 307         wdev_lock(wdev);
 308         __cfg80211_sme_scan_done(dev);
 309         wdev_unlock(wdev);
 310 }
 311
 312 void cfg80211_sme_rx_auth(struct wireless_dev *wdev, const u8 *buf, size_t len)
 313 {
 314         struct wiphy *wiphy = wdev->wiphy;
 315         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 316         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)buf;
 317         u16 status_code = le16_to_cpu(mgmt->u.auth.status_code);
 318
 319         ASSERT_WDEV_LOCK(wdev);
 320
 321         if (!wdev->conn || wdev->conn->state == CFG80211_CONN_CONNECTED)
 322                 return;
 323
 324         if (status_code == WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG &&
 325             wdev->conn->auto_auth &&
 326             wdev->conn->params.auth_type != NL80211_AUTHTYPE_NETWORK_EAP) {
 327                 /* select automatically between only open, shared, leap */
 328                 switch (wdev->conn->params.auth_type) {
 329                 case NL80211_AUTHTYPE_OPEN_SYSTEM:
 330                         if (wdev->connect_keys)
 331                                 wdev->conn->params.auth_type =
 332                                         NL80211_AUTHTYPE_SHARED_KEY;
 333                         else
 334                                 wdev->conn->params.auth_type =
 335                                         NL80211_AUTHTYPE_NETWORK_EAP;
 336                         break;
 337                 case NL80211_AUTHTYPE_SHARED_KEY:
 338                         wdev->conn->params.auth_type =
 339                                 NL80211_AUTHTYPE_NETWORK_EAP;
 340                         break;
 341                 default:
 342                         /* huh? */
 343                         wdev->conn->params.auth_type =
 344                                 NL80211_AUTHTYPE_OPEN_SYSTEM;
 345                         break;
 346                 }
 347                 wdev->conn->state = CFG80211_CONN_AUTHENTICATE_NEXT;
 348                 schedule_work(&rdev->conn_work);
 349         } else if (status_code != WLAN_STATUS_SUCCESS) {
 350                 __cfg80211_connect_result(wdev->netdev, mgmt->bssid,
 351                                           NULL, 0, NULL, 0,
 352                                           status_code, false, NULL);
 353         } else if (wdev->conn->state == CFG80211_CONN_AUTHENTICATING) {
 354                 wdev->conn->state = CFG80211_CONN_ASSOCIATE_NEXT;
 355                 schedule_work(&rdev->conn_work);
 356         }
 357 }
 358
 359 bool cfg80211_sme_rx_assoc_resp(struct wireless_dev *wdev, u16 status)
 360 {
 361         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 362
 363         if (!wdev->conn)
 364                 return false;
 365
 366         if (status == WLAN_STATUS_SUCCESS) {
 367                 wdev->conn->state = CFG80211_CONN_CONNECTED;
 368                 return false;
 369         }
 370
 371         if (wdev->conn->prev_bssid_valid) {
 372                 /*
 373                  * Some stupid APs don't accept reassoc, so we
 374                  * need to fall back to trying regular assoc;
 375                  * return true so no event is sent to userspace.
 376                  */
 377                 wdev->conn->prev_bssid_valid = false;
 378                 wdev->conn->state = CFG80211_CONN_ASSOCIATE_NEXT;
 379                 schedule_work(&rdev->conn_work);
 380                 return true;
 381         }
 382
 383         wdev->conn->state = CFG80211_CONN_ASSOC_FAILED;
 384         schedule_work(&rdev->conn_work);
 385         return false;
 386 }
 387
 388 void cfg80211_sme_deauth(struct wireless_dev *wdev)
 389 {
 390         cfg80211_sme_free(wdev);
 391 }
 392
 393 void cfg80211_sme_auth_timeout(struct wireless_dev *wdev)
 394 {
 395         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 396
 397         if (!wdev->conn)
 398                 return;
 399
 400         wdev->conn->state = CFG80211_CONN_AUTH_FAILED;
 401         schedule_work(&rdev->conn_work);
 402 }
 403
 404 void cfg80211_sme_disassoc(struct wireless_dev *wdev)
 405 {
 406         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 407
 408         if (!wdev->conn)
 409                 return;
 410
 411         wdev->conn->state = CFG80211_CONN_DEAUTH;
 412         schedule_work(&rdev->conn_work);
 413 }
 414
 415 void cfg80211_sme_assoc_timeout(struct wireless_dev *wdev)
 416 {
 417         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 418
 419         if (!wdev->conn)
 420                 return;
 421
 422         wdev->conn->state = CFG80211_CONN_ASSOC_FAILED;
 423         schedule_work(&rdev->conn_work);
 424 }
 425
 426 static int cfg80211_sme_get_conn_ies(struct wireless_dev *wdev,
 427                                      const u8 *ies, size_t ies_len,
 428                                      const u8 **out_ies, size_t *out_ies_len)
 429 {
 430         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 431         u8 *buf;
 432         size_t offs;
 433
 434         if (!rdev->wiphy.extended_capabilities_len ||
 435             (ies && cfg80211_find_ie(WLAN_EID_EXT_CAPABILITY, ies, ies_len))) {
 436                 *out_ies = kmemdup(ies, ies_len, GFP_KERNEL);
 437                 if (!*out_ies)
 438                         return -ENOMEM;
 439                 *out_ies_len = ies_len;
 440                 return 0;
 441         }
 442
 443         buf = kmalloc(ies_len + rdev->wiphy.extended_capabilities_len + 2,
 444                       GFP_KERNEL);
 445         if (!buf)
 446                 return -ENOMEM;
 447
 448         if (ies_len) {
 449                 static const u8 before_extcapa[] = {
 450                         /* not listing IEs expected to be created by driver */
 451                         WLAN_EID_RSN,
 452                         WLAN_EID_QOS_CAPA,
 453                         WLAN_EID_RRM_ENABLED_CAPABILITIES,
 454                         WLAN_EID_MOBILITY_DOMAIN,
 455                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 456                         WLAN_EID_BSS_COEX_2040,
 457                 };
 458
 459                 offs = ieee80211_ie_split(ies, ies_len, before_extcapa,
 460                                           ARRAY_SIZE(before_extcapa), 0);
 461                 memcpy(buf, ies, offs);
 462                 /* leave a whole for extended capabilities IE */
 463                 memcpy(buf + offs + rdev->wiphy.extended_capabilities_len + 2,
 464                        ies + offs, ies_len - offs);
 465         } else {
 466                 offs = 0;
 467         }
 468
 469         /* place extended capabilities IE (with only driver capabilities) */
 470         buf[offs] = WLAN_EID_EXT_CAPABILITY;
 471         buf[offs + 1] = rdev->wiphy.extended_capabilities_len;
 472         memcpy(buf + offs + 2,
 473                rdev->wiphy.extended_capabilities,
 474                rdev->wiphy.extended_capabilities_len);
 475
 476         *out_ies = buf;
 477         *out_ies_len = ies_len + rdev->wiphy.extended_capabilities_len + 2;
 478
 479         return 0;
 480 }
 481
 482 static int cfg80211_sme_connect(struct wireless_dev *wdev,
 483                                 struct cfg80211_connect_params *connect,
 484                                 const u8 *prev_bssid)
 485 {
 486         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 487         struct cfg80211_bss *bss;
 488         int err;
 489
 490         if (!rdev->ops->auth || !rdev->ops->assoc)
 491                 return -EOPNOTSUPP;
 492
 493         if (wdev->current_bss) {
 494                 if (!prev_bssid)
 495                         return -EALREADY;
 496                 if (prev_bssid &&
 497                     !ether_addr_equal(prev_bssid, wdev->current_bss->pub.bssid))
 498                         return -ENOTCONN;
 499                 cfg80211_unhold_bss(wdev->current_bss);
 500                 cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
 501                 wdev->current_bss = NULL;
 502
 503                 cfg80211_sme_free(wdev);
 504         }
 505
 506         if (WARN_ON(wdev->conn))
 507                 return -EINPROGRESS;
 508
 509         wdev->conn = kzalloc(sizeof(*wdev->conn), GFP_KERNEL);
 510         if (!wdev->conn)
 511                 return -ENOMEM;
 512
 513         /*
 514          * Copy all parameters, and treat explicitly IEs, BSSID, SSID.
 515          */
 516         memcpy(&wdev->conn->params, connect, sizeof(*connect));
 517         if (connect->bssid) {
 518                 wdev->conn->params.bssid = wdev->conn->bssid;
 519                 memcpy(wdev->conn->bssid, connect->bssid, ETH_ALEN);
 520         }
 521
 522         if (cfg80211_sme_get_conn_ies(wdev, connect->ie, connect->ie_len,
 523                                       &wdev->conn->ie,
 524                                       &wdev->conn->params.ie_len)) {
 525                 kfree(wdev->conn);
 526                 wdev->conn = NULL;
 527                 return -ENOMEM;
 528         }
 529         wdev->conn->params.ie = wdev->conn->ie;
 530
 531         if (connect->auth_type == NL80211_AUTHTYPE_AUTOMATIC) {
 532                 wdev->conn->auto_auth = true;
 533                 /* start with open system ... should mostly work */
 534                 wdev->conn->params.auth_type =
 535                         NL80211_AUTHTYPE_OPEN_SYSTEM;
 536         } else {
 537                 wdev->conn->auto_auth = false;
 538         }
 539
 540         wdev->conn->params.ssid = wdev->ssid;
 541         wdev->conn->params.ssid_len = wdev->ssid_len;
 542
 543         /* see if we have the bss already */
 544         bss = cfg80211_get_conn_bss(wdev);
 545
 546         if (prev_bssid) {
 547                 memcpy(wdev->conn->prev_bssid, prev_bssid, ETH_ALEN);
 548                 wdev->conn->prev_bssid_valid = true;
 549         }
 550
 551         /* we're good if we have a matching bss struct */
 552         if (bss) {
 553                 err = cfg80211_conn_do_work(wdev);
 554                 cfg80211_put_bss(wdev->wiphy, bss);
 555         } else {
 556                 /* otherwise we'll need to scan for the AP first */
 557                 err = cfg80211_conn_scan(wdev);
 558
 559                 /*
 560                  * If we can't scan right now, then we need to scan again
 561                  * after the current scan finished, since the parameters
 562                  * changed (unless we find a good AP anyway).
 563                  */
 564                 if (err == -EBUSY) {
 565                         err = 0;
 566                         wdev->conn->state = CFG80211_CONN_SCAN_AGAIN;
 567                 }
 568         }
 569
 570         if (err)
 571                 cfg80211_sme_free(wdev);
 572
 573         return err;
 574 }
 575
 576 static int cfg80211_sme_disconnect(struct wireless_dev *wdev, u16 reason)
 577 {
 578         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 579         int err;
 580
 581         if (!wdev->conn)
 582                 return 0;
 583
 584         if (!rdev->ops->deauth)
 585                 return -EOPNOTSUPP;
 586
 587         if (wdev->conn->state == CFG80211_CONN_SCANNING ||
 588             wdev->conn->state == CFG80211_CONN_SCAN_AGAIN) {
 589                 err = 0;
 590                 goto out;
 591         }
 592
 593         /* wdev->conn->params.bssid must be set if > SCANNING */
 594         err = cfg80211_mlme_deauth(rdev, wdev->netdev,
 595                                    wdev->conn->params.bssid,
 596                                    NULL, 0, reason, false);
 597  out:
 598         cfg80211_sme_free(wdev);
 599         return err;
 600 }
 601
 602 /*
 603  * code shared for in-device and software SME
 604  */
 605
 606 static bool cfg80211_is_all_idle(void)
 607 {
 608         struct cfg80211_registered_device *rdev;
 609         struct wireless_dev *wdev;
 610         bool is_all_idle = true;
 611
 612         /*
 613          * All devices must be idle as otherwise if you are actively
 614          * scanning some new beacon hints could be learned and would
 615          * count as new regulatory hints.
 616          */
 617         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
 618                 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
 619                         wdev_lock(wdev);
 620                         if (wdev->conn || wdev->current_bss)
 621                                 is_all_idle = false;
 622                         wdev_unlock(wdev);
 623                 }
 624         }
 625
 626         return is_all_idle;
 627 }
 628
 629 static void disconnect_work(struct work_struct *work)
 630 {
 631         rtnl_lock();
 632         if (cfg80211_is_all_idle())
 633                 regulatory_hint_disconnect();
 634         rtnl_unlock();
 635 }
 636
 637 static DECLARE_WORK(cfg80211_disconnect_work, disconnect_work);
 638
 639
 640 /*
 641  * API calls for drivers implementing connect/disconnect and
 642  * SME event handling
 643  */
 644
 645 /* This method must consume bss one way or another */
 646 void __cfg80211_connect_result(struct net_device *dev, const u8 *bssid,
 647                                const u8 *req_ie, size_t req_ie_len,
 648                                const u8 *resp_ie, size_t resp_ie_len,
 649                                int status, bool wextev,
 650                                struct cfg80211_bss *bss)
 651 {
 652         struct wireless_dev *wdev = dev->ieee80211_ptr;
 653         const u8 *country_ie;
 654 #ifdef CONFIG_CFG80211_WEXT
 655         union iwreq_data wrqu;
 656 #endif
 657
 658         ASSERT_WDEV_LOCK(wdev);
 659
 660         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION &&
 661                     wdev->iftype != NL80211_IFTYPE_P2P_CLIENT)) {
 662                 cfg80211_put_bss(wdev->wiphy, bss);
 663                 return;
 664         }
 665
 666         nl80211_send_connect_result(wiphy_to_rdev(wdev->wiphy), dev,
 667                                     bssid, req_ie, req_ie_len,
 668                                     resp_ie, resp_ie_len,
 669                                     status, GFP_KERNEL);
 670
 671 #ifdef CONFIG_CFG80211_WEXT
 672         if (wextev) {
 673                 if (req_ie && status == WLAN_STATUS_SUCCESS) {
 674                         memset(&wrqu, 0, sizeof(wrqu));
 675                         wrqu.data.length = req_ie_len;
 676                         wireless_send_event(dev, IWEVASSOCREQIE, &wrqu, req_ie);
 677                 }
 678
 679                 if (resp_ie && status == WLAN_STATUS_SUCCESS) {
 680                         memset(&wrqu, 0, sizeof(wrqu));
 681                         wrqu.data.length = resp_ie_len;
 682                         wireless_send_event(dev, IWEVASSOCRESPIE, &wrqu, resp_ie);
 683                 }
 684
 685                 memset(&wrqu, 0, sizeof(wrqu));
 686                 wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 687                 if (bssid && status == WLAN_STATUS_SUCCESS) {
 688                         memcpy(wrqu.ap_addr.sa_data, bssid, ETH_ALEN);
 689                         memcpy(wdev->wext.prev_bssid, bssid, ETH_ALEN);
 690                         wdev->wext.prev_bssid_valid = true;
 691                 }
 692                 wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL);
 693         }
 694 #endif
 695
 696         if (!bss && (status == WLAN_STATUS_SUCCESS)) {
 697                 WARN_ON_ONCE(!wiphy_to_rdev(wdev->wiphy)->ops->connect);
 698                 bss = cfg80211_get_bss(wdev->wiphy, NULL, bssid,
 699                                        wdev->ssid, wdev->ssid_len,
 700                                        wdev->conn_bss_type,
 701                                        IEEE80211_PRIVACY_ANY);
 702                 if (bss)
 703                         cfg80211_hold_bss(bss_from_pub(bss));
 704         }
 705
 706         if (wdev->current_bss) {
 707                 cfg80211_unhold_bss(wdev->current_bss);
 708                 cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
 709                 wdev->current_bss = NULL;
 710         }
 711
 712         if (status != WLAN_STATUS_SUCCESS) {
 713                 kzfree(wdev->connect_keys);
 714                 wdev->connect_keys = NULL;
 715                 wdev->ssid_len = 0;
 716                 if (bss) {
 717                         cfg80211_unhold_bss(bss_from_pub(bss));
 718                         cfg80211_put_bss(wdev->wiphy, bss);
 719                 }
 720                 cfg80211_sme_free(wdev);
 721                 return;
 722         }
 723
 724         if (WARN_ON(!bss))
 725                 return;
 726
 727         wdev->current_bss = bss_from_pub(bss);
 728
 729         cfg80211_upload_connect_keys(wdev);
 730
 731         rcu_read_lock();
 732         country_ie = ieee80211_bss_get_ie(bss, WLAN_EID_COUNTRY);
 733         if (!country_ie) {
 734                 rcu_read_unlock();
 735                 return;
 736         }
 737
 738         country_ie = kmemdup(country_ie, 2 + country_ie[1], GFP_ATOMIC);
 739         rcu_read_unlock();
 740
 741         if (!country_ie)
 742                 return;
 743
 744         /*
 745          * ieee80211_bss_get_ie() ensures we can access:
 746          * - country_ie + 2, the start of the country ie data, and
 747          * - and country_ie[1] which is the IE length
 748          */
 749         regulatory_hint_country_ie(wdev->wiphy, bss->channel->band,
 750                                    country_ie + 2, country_ie[1]);
 751         kfree(country_ie);
 752 }
 753
 754 /* Consumes bss object one way or another */
 755 void cfg80211_connect_bss(struct net_device *dev, const u8 *bssid,
 756                           struct cfg80211_bss *bss, const u8 *req_ie,
 757                           size_t req_ie_len, const u8 *resp_ie,
 758                           size_t resp_ie_len, int status, gfp_t gfp)
 759 {
 760         struct wireless_dev *wdev = dev->ieee80211_ptr;
 761         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 762         struct cfg80211_event *ev;
 763         unsigned long flags;
 764
 765         if (bss) {
 766                 /* Make sure the bss entry provided by the driver is valid. */
 767                 struct cfg80211_internal_bss *ibss = bss_from_pub(bss);
 768
 769                 if (WARN_ON(list_empty(&ibss->list))) {
 770                         cfg80211_put_bss(wdev->wiphy, bss);
 771                         return;
 772                 }
 773         }
 774
 775         ev = kzalloc(sizeof(*ev) + req_ie_len + resp_ie_len, gfp);
 776         if (!ev) {
 777                 cfg80211_put_bss(wdev->wiphy, bss);
 778                 return;
 779         }
 780
 781         ev->type = EVENT_CONNECT_RESULT;
 782         if (bssid)
 783                 memcpy(ev->cr.bssid, bssid, ETH_ALEN);
 784         if (req_ie_len) {
 785                 ev->cr.req_ie = ((u8 *)ev) + sizeof(*ev);
 786                 ev->cr.req_ie_len = req_ie_len;
 787                 memcpy((void *)ev->cr.req_ie, req_ie, req_ie_len);
 788         }
 789         if (resp_ie_len) {
 790                 ev->cr.resp_ie = ((u8 *)ev) + sizeof(*ev) + req_ie_len;
 791                 ev->cr.resp_ie_len = resp_ie_len;
 792                 memcpy((void *)ev->cr.resp_ie, resp_ie, resp_ie_len);
 793         }
 794         if (bss)
 795                 cfg80211_hold_bss(bss_from_pub(bss));
 796         ev->cr.bss = bss;
 797         ev->cr.status = status;
 798
 799         spin_lock_irqsave(&wdev->event_lock, flags);
 800         list_add_tail(&ev->list, &wdev->event_list);
 801         spin_unlock_irqrestore(&wdev->event_lock, flags);
 802         queue_work(cfg80211_wq, &rdev->event_work);
 803 }
 804 EXPORT_SYMBOL(cfg80211_connect_bss);
 805
 806 /* Consumes bss object one way or another */
 807 void __cfg80211_roamed(struct wireless_dev *wdev,
 808                        struct cfg80211_bss *bss,
 809                        const u8 *req_ie, size_t req_ie_len,
 810                        const u8 *resp_ie, size_t resp_ie_len)
 811 {
 812 #ifdef CONFIG_CFG80211_WEXT
 813         union iwreq_data wrqu;
 814 #endif
 815         ASSERT_WDEV_LOCK(wdev);
 816
 817         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION &&
 818                     wdev->iftype != NL80211_IFTYPE_P2P_CLIENT))
 819                 goto out;
 820
 821         if (WARN_ON(!wdev->current_bss))
 822                 goto out;
 823
 824         cfg80211_unhold_bss(wdev->current_bss);
 825         cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
 826         wdev->current_bss = NULL;
 827
 828         cfg80211_hold_bss(bss_from_pub(bss));
 829         wdev->current_bss = bss_from_pub(bss);
 830
 831         nl80211_send_roamed(wiphy_to_rdev(wdev->wiphy),
 832                             wdev->netdev, bss->bssid,
 833                             req_ie, req_ie_len, resp_ie, resp_ie_len,
 834                             GFP_KERNEL);
 835
 836 #ifdef CONFIG_CFG80211_WEXT
 837         if (req_ie) {
 838                 memset(&wrqu, 0, sizeof(wrqu));
 839                 wrqu.data.length = req_ie_len;
 840                 wireless_send_event(wdev->netdev, IWEVASSOCREQIE,
 841                                     &wrqu, req_ie);
 842         }
 843
 844         if (resp_ie) {
 845                 memset(&wrqu, 0, sizeof(wrqu));
 846                 wrqu.data.length = resp_ie_len;
 847                 wireless_send_event(wdev->netdev, IWEVASSOCRESPIE,
 848                                     &wrqu, resp_ie);
 849         }
 850
 851         memset(&wrqu, 0, sizeof(wrqu));
 852         wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 853         memcpy(wrqu.ap_addr.sa_data, bss->bssid, ETH_ALEN);
 854         memcpy(wdev->wext.prev_bssid, bss->bssid, ETH_ALEN);
 855         wdev->wext.prev_bssid_valid = true;
 856         wireless_send_event(wdev->netdev, SIOCGIWAP, &wrqu, NULL);
 857 #endif
 858
 859         return;
 860 out:
 861         cfg80211_put_bss(wdev->wiphy, bss);
 862 }
 863
 864 void cfg80211_roamed(struct net_device *dev,
 865                      struct ieee80211_channel *channel,
 866                      const u8 *bssid,
 867                      const u8 *req_ie, size_t req_ie_len,
 868                      const u8 *resp_ie, size_t resp_ie_len, gfp_t gfp)
 869 {
 870         struct wireless_dev *wdev = dev->ieee80211_ptr;
 871         struct cfg80211_bss *bss;
 872
 873         bss = cfg80211_get_bss(wdev->wiphy, channel, bssid, wdev->ssid,
 874                                wdev->ssid_len,
 875                                wdev->conn_bss_type, IEEE80211_PRIVACY_ANY);
 876         if (WARN_ON(!bss))
 877                 return;
 878
 879         cfg80211_roamed_bss(dev, bss, req_ie, req_ie_len, resp_ie,
 880                             resp_ie_len, gfp);
 881 }
 882 EXPORT_SYMBOL(cfg80211_roamed);
 883
 884 /* Consumes bss object one way or another */
 885 void cfg80211_roamed_bss(struct net_device *dev,
 886                          struct cfg80211_bss *bss, const u8 *req_ie,
 887                          size_t req_ie_len, const u8 *resp_ie,
 888                          size_t resp_ie_len, gfp_t gfp)
 889 {
 890         struct wireless_dev *wdev = dev->ieee80211_ptr;
 891         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 892         struct cfg80211_event *ev;
 893         unsigned long flags;
 894
 895         if (WARN_ON(!bss))
 896                 return;
 897
 898         ev = kzalloc(sizeof(*ev) + req_ie_len + resp_ie_len, gfp);
 899         if (!ev) {
 900                 cfg80211_put_bss(wdev->wiphy, bss);
 901                 return;
 902         }
 903
 904         ev->type = EVENT_ROAMED;
 905         ev->rm.req_ie = ((u8 *)ev) + sizeof(*ev);
 906         ev->rm.req_ie_len = req_ie_len;
 907         memcpy((void *)ev->rm.req_ie, req_ie, req_ie_len);
 908         ev->rm.resp_ie = ((u8 *)ev) + sizeof(*ev) + req_ie_len;
 909         ev->rm.resp_ie_len = resp_ie_len;
 910         memcpy((void *)ev->rm.resp_ie, resp_ie, resp_ie_len);
 911         ev->rm.bss = bss;
 912
 913         spin_lock_irqsave(&wdev->event_lock, flags);
 914         list_add_tail(&ev->list, &wdev->event_list);
 915         spin_unlock_irqrestore(&wdev->event_lock, flags);
 916         queue_work(cfg80211_wq, &rdev->event_work);
 917 }
 918 EXPORT_SYMBOL(cfg80211_roamed_bss);
 919
 920 void __cfg80211_disconnected(struct net_device *dev, const u8 *ie,
 921                              size_t ie_len, u16 reason, bool from_ap)
 922 {
 923         struct wireless_dev *wdev = dev->ieee80211_ptr;
 924         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 925         int i;
 926 #ifdef CONFIG_CFG80211_WEXT
 927         union iwreq_data wrqu;
 928 #endif
 929
 930         ASSERT_WDEV_LOCK(wdev);
 931
 932         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION &&
 933                     wdev->iftype != NL80211_IFTYPE_P2P_CLIENT))
 934                 return;
 935
 936         if (wdev->current_bss) {
 937                 cfg80211_unhold_bss(wdev->current_bss);
 938                 cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
 939         }
 940
 941         wdev->current_bss = NULL;
 942         wdev->ssid_len = 0;
 943
 944         nl80211_send_disconnected(rdev, dev, reason, ie, ie_len, from_ap);
 945
 946         /* stop critical protocol if supported */
 947         if (rdev->ops->crit_proto_stop && rdev->crit_proto_nlportid) {
 948                 rdev->crit_proto_nlportid = 0;
 949                 rdev_crit_proto_stop(rdev, wdev);
 950         }
 951
 952         /*
 953          * Delete all the keys ... pairwise keys can't really
 954          * exist any more anyway, but default keys might.
 955          */
 956         if (rdev->ops->del_key)
 957                 for (i = 0; i < 6; i++)
 958                         rdev_del_key(rdev, dev, i, false, NULL);
 959
 960         rdev_set_qos_map(rdev, dev, NULL);
 961
 962 #ifdef CONFIG_CFG80211_WEXT
 963         memset(&wrqu, 0, sizeof(wrqu));
 964         wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 965         wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL);
 966         wdev->wext.connect.ssid_len = 0;
 967 #endif
 968
 969         schedule_work(&cfg80211_disconnect_work);
 970 }
 971
 972 void cfg80211_disconnected(struct net_device *dev, u16 reason,
 973                            const u8 *ie, size_t ie_len,
 974                            bool locally_generated, gfp_t gfp)
 975 {
 976         struct wireless_dev *wdev = dev->ieee80211_ptr;
 977         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 978         struct cfg80211_event *ev;
 979         unsigned long flags;
 980
 981         ev = kzalloc(sizeof(*ev) + ie_len, gfp);
 982         if (!ev)
 983                 return;
 984
 985         ev->type = EVENT_DISCONNECTED;
 986         ev->dc.ie = ((u8 *)ev) + sizeof(*ev);
 987         ev->dc.ie_len = ie_len;
 988         memcpy((void *)ev->dc.ie, ie, ie_len);
 989         ev->dc.reason = reason;
 990         ev->dc.locally_generated = locally_generated;
 991
 992         spin_lock_irqsave(&wdev->event_lock, flags);
 993         list_add_tail(&ev->list, &wdev->event_list);
 994         spin_unlock_irqrestore(&wdev->event_lock, flags);
 995         queue_work(cfg80211_wq, &rdev->event_work);
 996 }
 997 EXPORT_SYMBOL(cfg80211_disconnected);
 998
 999 /*
1000  * API calls for nl80211/wext compatibility code
1001  */
1002 int cfg80211_connect(struct cfg80211_registered_device *rdev,
1003                      struct net_device *dev,
1004                      struct cfg80211_connect_params *connect,
1005                      struct cfg80211_cached_keys *connkeys,
1006                      const u8 *prev_bssid)
1007 {
1008         struct wireless_dev *wdev = dev->ieee80211_ptr;
1009         int err;
1010
1011         ASSERT_WDEV_LOCK(wdev);
1012
1013         if (WARN_ON(wdev->connect_keys)) {
1014                 kzfree(wdev->connect_keys);
1015                 wdev->connect_keys = NULL;
1016         }
1017
1018         cfg80211_oper_and_ht_capa(&connect->ht_capa_mask,
1019                                   rdev->wiphy.ht_capa_mod_mask);
1020
1021         if (connkeys && connkeys->def >= 0) {
1022                 int idx;
1023                 u32 cipher;
1024
1025                 idx = connkeys->def;
1026                 cipher = connkeys->params[idx].cipher;
1027                 /* If given a WEP key we may need it for shared key auth */
1028                 if (cipher == WLAN_CIPHER_SUITE_WEP40 ||
1029                     cipher == WLAN_CIPHER_SUITE_WEP104) {
1030                         connect->key_idx = idx;
1031                         connect->key = connkeys->params[idx].key;
1032                         connect->key_len = connkeys->params[idx].key_len;
1033
1034                         /*
1035                          * If ciphers are not set (e.g. when going through
1036                          * iwconfig), we have to set them appropriately here.
1037                          */
1038                         if (connect->crypto.cipher_group == 0)
1039                                 connect->crypto.cipher_group = cipher;
1040
1041                         if (connect->crypto.n_ciphers_pairwise == 0) {
1042                                 connect->crypto.n_ciphers_pairwise = 1;
1043                                 connect->crypto.ciphers_pairwise[0] = cipher;
1044                         }
1045                 }
1046         } else {
1047                 if (WARN_ON(connkeys))
1048                         return -EINVAL;
1049         }
1050
1051         wdev->connect_keys = connkeys;
1052         memcpy(wdev->ssid, connect->ssid, connect->ssid_len);
1053         wdev->ssid_len = connect->ssid_len;
1054
1055         wdev->conn_bss_type = connect->pbss ? IEEE80211_BSS_TYPE_PBSS :
1056                                               IEEE80211_BSS_TYPE_ESS;
1057
1058         if (!rdev->ops->connect)
1059                 err = cfg80211_sme_connect(wdev, connect, prev_bssid);
1060         else
1061                 err = rdev_connect(rdev, dev, connect);
1062
1063         if (err) {
1064                 wdev->connect_keys = NULL;
1065                 wdev->ssid_len = 0;
1066                 return err;
1067         }
1068
1069         return 0;
1070 }
1071
1072 int cfg80211_disconnect(struct cfg80211_registered_device *rdev,
1073                         struct net_device *dev, u16 reason, bool wextev)
1074 {
1075         struct wireless_dev *wdev = dev->ieee80211_ptr;
1076         int err = 0;
1077
1078         ASSERT_WDEV_LOCK(wdev);
1079
1080         kzfree(wdev->connect_keys);
1081         wdev->connect_keys = NULL;
1082
1083         if (wdev->conn)
1084                 err = cfg80211_sme_disconnect(wdev, reason);
1085         else if (!rdev->ops->disconnect)
1086                 cfg80211_mlme_down(rdev, dev);
1087         else if (wdev->current_bss)
1088                 err = rdev_disconnect(rdev, dev, reason);
1089
1090         return err;
1091 }