net/wireless/ibss.c

   1 /*
   2  * Some IBSS support code for cfg80211.
   3  *
   4  * Copyright 2009       Johannes Berg <johannes@sipsolutions.net>
   5  */
   6
   7 #include <linux/etherdevice.h>
   8 #include <linux/if_arp.h>
   9 #include <linux/slab.h>
  10 #include <linux/export.h>
  11 #include <net/cfg80211.h>
  12 #include "wext-compat.h"
  13 #include "nl80211.h"
  14 #include "rdev-ops.h"
  15
  16
  17 void __cfg80211_ibss_joined(struct net_device *dev, const u8 *bssid,
  18                             struct ieee80211_channel *channel)
  19 {
  20         struct wireless_dev *wdev = dev->ieee80211_ptr;
  21         struct cfg80211_bss *bss;
  22 #ifdef CONFIG_CFG80211_WEXT
  23         union iwreq_data wrqu;
  24 #endif
  25
  26         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
  27                 return;
  28
  29         if (!wdev->ssid_len)
  30                 return;
  31
  32         bss = cfg80211_get_bss(wdev->wiphy, channel, bssid, NULL, 0,
  33                                WLAN_CAPABILITY_IBSS, WLAN_CAPABILITY_IBSS);
  34
  35         if (WARN_ON(!bss))
  36                 return;
  37
  38         if (wdev->current_bss) {
  39                 cfg80211_unhold_bss(wdev->current_bss);
  40                 cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
  41         }
  42
  43         cfg80211_hold_bss(bss_from_pub(bss));
  44         wdev->current_bss = bss_from_pub(bss);
  45
  46         cfg80211_upload_connect_keys(wdev);
  47
  48         nl80211_send_ibss_bssid(wiphy_to_dev(wdev->wiphy), dev, bssid,
  49                                 GFP_KERNEL);
  50 #ifdef CONFIG_CFG80211_WEXT
  51         memset(&wrqu, 0, sizeof(wrqu));
  52         memcpy(wrqu.ap_addr.sa_data, bssid, ETH_ALEN);
  53         wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL);
  54 #endif
  55 }
  56
  57 void cfg80211_ibss_joined(struct net_device *dev, const u8 *bssid,
  58                           struct ieee80211_channel *channel, gfp_t gfp)
  59 {
  60         struct wireless_dev *wdev = dev->ieee80211_ptr;
  61         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
  62         struct cfg80211_event *ev;
  63         unsigned long flags;
  64
  65         trace_cfg80211_ibss_joined(dev, bssid, channel);
  66
  67         if (WARN_ON(!channel))
  68                 return;
  69
  70         ev = kzalloc(sizeof(*ev), gfp);
  71         if (!ev)
  72                 return;
  73
  74         ev->type = EVENT_IBSS_JOINED;
  75         memcpy(ev->ij.bssid, bssid, ETH_ALEN);
  76         ev->ij.channel = channel;
  77
  78         spin_lock_irqsave(&wdev->event_lock, flags);
  79         list_add_tail(&ev->list, &wdev->event_list);
  80         spin_unlock_irqrestore(&wdev->event_lock, flags);
  81         queue_work(cfg80211_wq, &rdev->event_work);
  82 }
  83 EXPORT_SYMBOL(cfg80211_ibss_joined);
  84
  85 int __cfg80211_join_ibss(struct cfg80211_registered_device *rdev,
  86                          struct net_device *dev,
  87                          struct cfg80211_ibss_params *params,
  88                          struct cfg80211_cached_keys *connkeys)
  89 {
  90         struct wireless_dev *wdev = dev->ieee80211_ptr;
  91         struct ieee80211_channel *check_chan;
  92         u8 radar_detect_width = 0;
  93         int err;
  94
  95         ASSERT_WDEV_LOCK(wdev);
  96
  97         if (wdev->ssid_len)
  98                 return -EALREADY;
  99
 100         if (!params->basic_rates) {
 101                 /*
 102                 * If no rates were explicitly configured,
 103                 * use the mandatory rate set for 11b or
 104                 * 11a for maximum compatibility.
 105                 */
 106                 struct ieee80211_supported_band *sband =
 107                         rdev->wiphy.bands[params->chandef.chan->band];
 108                 int j;
 109                 u32 flag = params->chandef.chan->band == IEEE80211_BAND_5GHZ ?
 110                         IEEE80211_RATE_MANDATORY_A :
 111                         IEEE80211_RATE_MANDATORY_B;
 112
 113                 for (j = 0; j < sband->n_bitrates; j++) {
 114                         if (sband->bitrates[j].flags & flag)
 115                                 params->basic_rates |= BIT(j);
 116                 }
 117         }
 118
 119         if (WARN_ON(wdev->connect_keys))
 120                 kfree(wdev->connect_keys);
 121         wdev->connect_keys = connkeys;
 122
 123         wdev->ibss_fixed = params->channel_fixed;
 124         wdev->ibss_dfs_possible = params->userspace_handles_dfs;
 125 #ifdef CONFIG_CFG80211_WEXT
 126         wdev->wext.ibss.chandef = params->chandef;
 127 #endif
 128         check_chan = params->chandef.chan;
 129         if (params->userspace_handles_dfs) {
 130                 /* use channel NULL to check for radar even if the current
 131                  * channel is not a radar channel - it might decide to change
 132                  * to DFS channel later.
 133                  */
 134                 radar_detect_width = BIT(params->chandef.width);
 135                 check_chan = NULL;
 136         }
 137
 138         err = cfg80211_can_use_iftype_chan(rdev, wdev, wdev->iftype,
 139                                            check_chan,
 140                                            (params->channel_fixed &&
 141                                             !radar_detect_width)
 142                                            ? CHAN_MODE_SHARED
 143                                            : CHAN_MODE_EXCLUSIVE,
 144                                            radar_detect_width);
 145
 146         if (err) {
 147                 wdev->connect_keys = NULL;
 148                 return err;
 149         }
 150
 151         err = rdev_join_ibss(rdev, dev, params);
 152         if (err) {
 153                 wdev->connect_keys = NULL;
 154                 return err;
 155         }
 156
 157         memcpy(wdev->ssid, params->ssid, params->ssid_len);
 158         wdev->ssid_len = params->ssid_len;
 159
 160         return 0;
 161 }
 162
 163 int cfg80211_join_ibss(struct cfg80211_registered_device *rdev,
 164                        struct net_device *dev,
 165                        struct cfg80211_ibss_params *params,
 166                        struct cfg80211_cached_keys *connkeys)
 167 {
 168         struct wireless_dev *wdev = dev->ieee80211_ptr;
 169         int err;
 170
 171         ASSERT_RTNL();
 172
 173         wdev_lock(wdev);
 174         err = __cfg80211_join_ibss(rdev, dev, params, connkeys);
 175         wdev_unlock(wdev);
 176
 177         return err;
 178 }
 179
 180 static void __cfg80211_clear_ibss(struct net_device *dev, bool nowext)
 181 {
 182         struct wireless_dev *wdev = dev->ieee80211_ptr;
 183         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 184         int i;
 185
 186         ASSERT_WDEV_LOCK(wdev);
 187
 188         kfree(wdev->connect_keys);
 189         wdev->connect_keys = NULL;
 190
 191         rdev_set_qos_map(rdev, dev, NULL);
 192
 193         /*
 194          * Delete all the keys ... pairwise keys can't really
 195          * exist any more anyway, but default keys might.
 196          */
 197         if (rdev->ops->del_key)
 198                 for (i = 0; i < 6; i++)
 199                         rdev_del_key(rdev, dev, i, false, NULL);
 200
 201         if (wdev->current_bss) {
 202                 cfg80211_unhold_bss(wdev->current_bss);
 203                 cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
 204         }
 205
 206         wdev->current_bss = NULL;
 207         wdev->ssid_len = 0;
 208 #ifdef CONFIG_CFG80211_WEXT
 209         if (!nowext)
 210                 wdev->wext.ibss.ssid_len = 0;
 211 #endif
 212 }
 213
 214 void cfg80211_clear_ibss(struct net_device *dev, bool nowext)
 215 {
 216         struct wireless_dev *wdev = dev->ieee80211_ptr;
 217
 218         wdev_lock(wdev);
 219         __cfg80211_clear_ibss(dev, nowext);
 220         wdev_unlock(wdev);
 221 }
 222
 223 int __cfg80211_leave_ibss(struct cfg80211_registered_device *rdev,
 224                           struct net_device *dev, bool nowext)
 225 {
 226         struct wireless_dev *wdev = dev->ieee80211_ptr;
 227         int err;
 228
 229         ASSERT_WDEV_LOCK(wdev);
 230
 231         if (!wdev->ssid_len)
 232                 return -ENOLINK;
 233
 234         err = rdev_leave_ibss(rdev, dev);
 235
 236         if (err)
 237                 return err;
 238
 239         __cfg80211_clear_ibss(dev, nowext);
 240
 241         return 0;
 242 }
 243
 244 int cfg80211_leave_ibss(struct cfg80211_registered_device *rdev,
 245                         struct net_device *dev, bool nowext)
 246 {
 247         struct wireless_dev *wdev = dev->ieee80211_ptr;
 248         int err;
 249
 250         wdev_lock(wdev);
 251         err = __cfg80211_leave_ibss(rdev, dev, nowext);
 252         wdev_unlock(wdev);
 253
 254         return err;
 255 }
 256
 257 #ifdef CONFIG_CFG80211_WEXT
 258 int cfg80211_ibss_wext_join(struct cfg80211_registered_device *rdev,
 259                             struct wireless_dev *wdev)
 260 {
 261         struct cfg80211_cached_keys *ck = NULL;
 262         enum ieee80211_band band;
 263         int i, err;
 264
 265         ASSERT_WDEV_LOCK(wdev);
 266
 267         if (!wdev->wext.ibss.beacon_interval)
 268                 wdev->wext.ibss.beacon_interval = 100;
 269
 270         /* try to find an IBSS channel if none requested ... */
 271         if (!wdev->wext.ibss.chandef.chan) {
 272                 struct ieee80211_channel *new_chan = NULL;
 273
 274                 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 275                         struct ieee80211_supported_band *sband;
 276                         struct ieee80211_channel *chan;
 277
 278                         sband = rdev->wiphy.bands[band];
 279                         if (!sband)
 280                                 continue;
 281
 282                         for (i = 0; i < sband->n_channels; i++) {
 283                                 chan = &sband->channels[i];
 284                                 if (chan->flags & IEEE80211_CHAN_NO_IR)
 285                                         continue;
 286                                 if (chan->flags & IEEE80211_CHAN_DISABLED)
 287                                         continue;
 288                                 new_chan = chan;
 289                                 break;
 290                         }
 291
 292                         if (new_chan)
 293                                 break;
 294                 }
 295
 296                 if (!new_chan)
 297                         return -EINVAL;
 298
 299                 cfg80211_chandef_create(&wdev->wext.ibss.chandef, new_chan,
 300                                         NL80211_CHAN_NO_HT);
 301         }
 302
 303         /* don't join -- SSID is not there */
 304         if (!wdev->wext.ibss.ssid_len)
 305                 return 0;
 306
 307         if (!netif_running(wdev->netdev))
 308                 return 0;
 309
 310         if (wdev->wext.keys) {
 311                 wdev->wext.keys->def = wdev->wext.default_key;
 312                 wdev->wext.keys->defmgmt = wdev->wext.default_mgmt_key;
 313         }
 314
 315         wdev->wext.ibss.privacy = wdev->wext.default_key != -1;
 316
 317         if (wdev->wext.keys) {
 318                 ck = kmemdup(wdev->wext.keys, sizeof(*ck), GFP_KERNEL);
 319                 if (!ck)
 320                         return -ENOMEM;
 321                 for (i = 0; i < 6; i++)
 322                         ck->params[i].key = ck->data[i];
 323         }
 324         err = __cfg80211_join_ibss(rdev, wdev->netdev,
 325                                    &wdev->wext.ibss, ck);
 326         if (err)
 327                 kfree(ck);
 328
 329         return err;
 330 }
 331
 332 int cfg80211_ibss_wext_siwfreq(struct net_device *dev,
 333                                struct iw_request_info *info,
 334                                struct iw_freq *wextfreq, char *extra)
 335 {
 336         struct wireless_dev *wdev = dev->ieee80211_ptr;
 337         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 338         struct ieee80211_channel *chan = NULL;
 339         int err, freq;
 340
 341         /* call only for ibss! */
 342         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
 343                 return -EINVAL;
 344
 345         if (!rdev->ops->join_ibss)
 346                 return -EOPNOTSUPP;
 347
 348         freq = cfg80211_wext_freq(wdev->wiphy, wextfreq);
 349         if (freq < 0)
 350                 return freq;
 351
 352         if (freq) {
 353                 chan = ieee80211_get_channel(wdev->wiphy, freq);
 354                 if (!chan)
 355                         return -EINVAL;
 356                 if (chan->flags & IEEE80211_CHAN_NO_IR ||
 357                     chan->flags & IEEE80211_CHAN_DISABLED)
 358                         return -EINVAL;
 359         }
 360
 361         if (wdev->wext.ibss.chandef.chan == chan)
 362                 return 0;
 363
 364         wdev_lock(wdev);
 365         err = 0;
 366         if (wdev->ssid_len)
 367                 err = __cfg80211_leave_ibss(rdev, dev, true);
 368         wdev_unlock(wdev);
 369
 370         if (err)
 371                 return err;
 372
 373         if (chan) {
 374                 cfg80211_chandef_create(&wdev->wext.ibss.chandef, chan,
 375                                         NL80211_CHAN_NO_HT);
 376                 wdev->wext.ibss.channel_fixed = true;
 377         } else {
 378                 /* cfg80211_ibss_wext_join will pick one if needed */
 379                 wdev->wext.ibss.channel_fixed = false;
 380         }
 381
 382         wdev_lock(wdev);
 383         err = cfg80211_ibss_wext_join(rdev, wdev);
 384         wdev_unlock(wdev);
 385
 386         return err;
 387 }
 388
 389 int cfg80211_ibss_wext_giwfreq(struct net_device *dev,
 390                                struct iw_request_info *info,
 391                                struct iw_freq *freq, char *extra)
 392 {
 393         struct wireless_dev *wdev = dev->ieee80211_ptr;
 394         struct ieee80211_channel *chan = NULL;
 395
 396         /* call only for ibss! */
 397         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
 398                 return -EINVAL;
 399
 400         wdev_lock(wdev);
 401         if (wdev->current_bss)
 402                 chan = wdev->current_bss->pub.channel;
 403         else if (wdev->wext.ibss.chandef.chan)
 404                 chan = wdev->wext.ibss.chandef.chan;
 405         wdev_unlock(wdev);
 406
 407         if (chan) {
 408                 freq->m = chan->center_freq;
 409                 freq->e = 6;
 410                 return 0;
 411         }
 412
 413         /* no channel if not joining */
 414         return -EINVAL;
 415 }
 416
 417 int cfg80211_ibss_wext_siwessid(struct net_device *dev,
 418                                 struct iw_request_info *info,
 419                                 struct iw_point *data, char *ssid)
 420 {
 421         struct wireless_dev *wdev = dev->ieee80211_ptr;
 422         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 423         size_t len = data->length;
 424         int err;
 425
 426         /* call only for ibss! */
 427         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
 428                 return -EINVAL;
 429
 430         if (!rdev->ops->join_ibss)
 431                 return -EOPNOTSUPP;
 432
 433         wdev_lock(wdev);
 434         err = 0;
 435         if (wdev->ssid_len)
 436                 err = __cfg80211_leave_ibss(rdev, dev, true);
 437         wdev_unlock(wdev);
 438
 439         if (err)
 440                 return err;
 441
 442         /* iwconfig uses nul termination in SSID.. */
 443         if (len > 0 && ssid[len - 1] == '\0')
 444                 len--;
 445
 446         wdev->wext.ibss.ssid = wdev->ssid;
 447         memcpy(wdev->wext.ibss.ssid, ssid, len);
 448         wdev->wext.ibss.ssid_len = len;
 449
 450         wdev_lock(wdev);
 451         err = cfg80211_ibss_wext_join(rdev, wdev);
 452         wdev_unlock(wdev);
 453
 454         return err;
 455 }
 456
 457 int cfg80211_ibss_wext_giwessid(struct net_device *dev,
 458                                 struct iw_request_info *info,
 459                                 struct iw_point *data, char *ssid)
 460 {
 461         struct wireless_dev *wdev = dev->ieee80211_ptr;
 462
 463         /* call only for ibss! */
 464         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
 465                 return -EINVAL;
 466
 467         data->flags = 0;
 468
 469         wdev_lock(wdev);
 470         if (wdev->ssid_len) {
 471                 data->flags = 1;
 472                 data->length = wdev->ssid_len;
 473                 memcpy(ssid, wdev->ssid, data->length);
 474         } else if (wdev->wext.ibss.ssid && wdev->wext.ibss.ssid_len) {
 475                 data->flags = 1;
 476                 data->length = wdev->wext.ibss.ssid_len;
 477                 memcpy(ssid, wdev->wext.ibss.ssid, data->length);
 478         }
 479         wdev_unlock(wdev);
 480
 481         return 0;
 482 }
 483
 484 int cfg80211_ibss_wext_siwap(struct net_device *dev,
 485                              struct iw_request_info *info,
 486                              struct sockaddr *ap_addr, char *extra)
 487 {
 488         struct wireless_dev *wdev = dev->ieee80211_ptr;
 489         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 490         u8 *bssid = ap_addr->sa_data;
 491         int err;
 492
 493         /* call only for ibss! */
 494         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
 495                 return -EINVAL;
 496
 497         if (!rdev->ops->join_ibss)
 498                 return -EOPNOTSUPP;
 499
 500         if (ap_addr->sa_family != ARPHRD_ETHER)
 501                 return -EINVAL;
 502
 503         /* automatic mode */
 504         if (is_zero_ether_addr(bssid) || is_broadcast_ether_addr(bssid))
 505                 bssid = NULL;
 506
 507         /* both automatic */
 508         if (!bssid && !wdev->wext.ibss.bssid)
 509                 return 0;
 510
 511         /* fixed already - and no change */
 512         if (wdev->wext.ibss.bssid && bssid &&
 513             ether_addr_equal(bssid, wdev->wext.ibss.bssid))
 514                 return 0;
 515
 516         wdev_lock(wdev);
 517         err = 0;
 518         if (wdev->ssid_len)
 519                 err = __cfg80211_leave_ibss(rdev, dev, true);
 520         wdev_unlock(wdev);
 521
 522         if (err)
 523                 return err;
 524
 525         if (bssid) {
 526                 memcpy(wdev->wext.bssid, bssid, ETH_ALEN);
 527                 wdev->wext.ibss.bssid = wdev->wext.bssid;
 528         } else
 529                 wdev->wext.ibss.bssid = NULL;
 530
 531         wdev_lock(wdev);
 532         err = cfg80211_ibss_wext_join(rdev, wdev);
 533         wdev_unlock(wdev);
 534
 535         return err;
 536 }
 537
 538 int cfg80211_ibss_wext_giwap(struct net_device *dev,
 539                              struct iw_request_info *info,
 540                              struct sockaddr *ap_addr, char *extra)
 541 {
 542         struct wireless_dev *wdev = dev->ieee80211_ptr;
 543
 544         /* call only for ibss! */
 545         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
 546                 return -EINVAL;
 547
 548         ap_addr->sa_family = ARPHRD_ETHER;
 549
 550         wdev_lock(wdev);
 551         if (wdev->current_bss)
 552                 memcpy(ap_addr->sa_data, wdev->current_bss->pub.bssid, ETH_ALEN);
 553         else if (wdev->wext.ibss.bssid)
 554                 memcpy(ap_addr->sa_data, wdev->wext.ibss.bssid, ETH_ALEN);
 555         else
 556                 memset(ap_addr->sa_data, 0, ETH_ALEN);
 557
 558         wdev_unlock(wdev);
 559
 560         return 0;
 561 }
 562 #endif