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 <net/cfg80211.h>
  11 #include "wext-compat.h"
  12 #include "nl80211.h"
  13
  14
  15 void __cfg80211_ibss_joined(struct net_device *dev, const u8 *bssid)
  16 {
  17         struct wireless_dev *wdev = dev->ieee80211_ptr;
  18         struct cfg80211_bss *bss;
  19 #ifdef CONFIG_CFG80211_WEXT
  20         union iwreq_data wrqu;
  21 #endif
  22
  23         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
  24                 return;
  25
  26         if (!wdev->ssid_len)
  27                 return;
  28
  29         bss = cfg80211_get_bss(wdev->wiphy, NULL, bssid,
  30                                wdev->ssid, wdev->ssid_len,
  31                                WLAN_CAPABILITY_IBSS, WLAN_CAPABILITY_IBSS);
  32
  33         if (WARN_ON(!bss))
  34                 return;
  35
  36         if (wdev->current_bss) {
  37                 cfg80211_unhold_bss(wdev->current_bss);
  38                 cfg80211_put_bss(&wdev->current_bss->pub);
  39         }
  40
  41         cfg80211_hold_bss(bss_from_pub(bss));
  42         wdev->current_bss = bss_from_pub(bss);
  43
  44         cfg80211_upload_connect_keys(wdev);
  45
  46         nl80211_send_ibss_bssid(wiphy_to_dev(wdev->wiphy), dev, bssid,
  47                                 GFP_KERNEL);
  48 #ifdef CONFIG_CFG80211_WEXT
  49         memset(&wrqu, 0, sizeof(wrqu));
  50         memcpy(wrqu.ap_addr.sa_data, bssid, ETH_ALEN);
  51         wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL);
  52 #endif
  53 }
  54
  55 void cfg80211_ibss_joined(struct net_device *dev, const u8 *bssid, gfp_t gfp)
  56 {
  57         struct wireless_dev *wdev = dev->ieee80211_ptr;
  58         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
  59         struct cfg80211_event *ev;
  60         unsigned long flags;
  61
  62         CFG80211_DEV_WARN_ON(!wdev->ssid_len);
  63
  64         ev = kzalloc(sizeof(*ev), gfp);
  65         if (!ev)
  66                 return;
  67
  68         ev->type = EVENT_IBSS_JOINED;
  69         memcpy(ev->cr.bssid, bssid, ETH_ALEN);
  70
  71         spin_lock_irqsave(&wdev->event_lock, flags);
  72         list_add_tail(&ev->list, &wdev->event_list);
  73         spin_unlock_irqrestore(&wdev->event_lock, flags);
  74         queue_work(cfg80211_wq, &rdev->event_work);
  75 }
  76 EXPORT_SYMBOL(cfg80211_ibss_joined);
  77
  78 int __cfg80211_join_ibss(struct cfg80211_registered_device *rdev,
  79                          struct net_device *dev,
  80                          struct cfg80211_ibss_params *params,
  81                          struct cfg80211_cached_keys *connkeys)
  82 {
  83         struct wireless_dev *wdev = dev->ieee80211_ptr;
  84         int err;
  85
  86         ASSERT_WDEV_LOCK(wdev);
  87
  88         if (wdev->ssid_len)
  89                 return -EALREADY;
  90
  91         if (!params->basic_rates) {
  92                 /*
  93                 * If no rates were explicitly configured,
  94                 * use the mandatory rate set for 11b or
  95                 * 11a for maximum compatibility.
  96                 */
  97                 struct ieee80211_supported_band *sband =
  98                         rdev->wiphy.bands[params->channel->band];
  99                 int j;
 100                 u32 flag = params->channel->band == IEEE80211_BAND_5GHZ ?
 101                         IEEE80211_RATE_MANDATORY_A :
 102                         IEEE80211_RATE_MANDATORY_B;
 103
 104                 for (j = 0; j < sband->n_bitrates; j++) {
 105                         if (sband->bitrates[j].flags & flag)
 106                                 params->basic_rates |= BIT(j);
 107                 }
 108         }
 109
 110         if (WARN_ON(wdev->connect_keys))
 111                 kfree(wdev->connect_keys);
 112         wdev->connect_keys = connkeys;
 113
 114 #ifdef CONFIG_CFG80211_WEXT
 115         wdev->wext.ibss.channel = params->channel;
 116 #endif
 117         err = rdev->ops->join_ibss(&rdev->wiphy, dev, params);
 118         if (err) {
 119                 wdev->connect_keys = NULL;
 120                 return err;
 121         }
 122
 123         memcpy(wdev->ssid, params->ssid, params->ssid_len);
 124         wdev->ssid_len = params->ssid_len;
 125
 126         return 0;
 127 }
 128
 129 int cfg80211_join_ibss(struct cfg80211_registered_device *rdev,
 130                        struct net_device *dev,
 131                        struct cfg80211_ibss_params *params,
 132                        struct cfg80211_cached_keys *connkeys)
 133 {
 134         struct wireless_dev *wdev = dev->ieee80211_ptr;
 135         int err;
 136
 137         mutex_lock(&rdev->devlist_mtx);
 138         wdev_lock(wdev);
 139         err = __cfg80211_join_ibss(rdev, dev, params, connkeys);
 140         wdev_unlock(wdev);
 141         mutex_unlock(&rdev->devlist_mtx);
 142
 143         return err;
 144 }
 145
 146 static void __cfg80211_clear_ibss(struct net_device *dev, bool nowext)
 147 {
 148         struct wireless_dev *wdev = dev->ieee80211_ptr;
 149         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 150         int i;
 151
 152         ASSERT_WDEV_LOCK(wdev);
 153
 154         kfree(wdev->connect_keys);
 155         wdev->connect_keys = NULL;
 156
 157         /*
 158          * Delete all the keys ... pairwise keys can't really
 159          * exist any more anyway, but default keys might.
 160          */
 161         if (rdev->ops->del_key)
 162                 for (i = 0; i < 6; i++)
 163                         rdev->ops->del_key(wdev->wiphy, dev, i, false, NULL);
 164
 165         if (wdev->current_bss) {
 166                 cfg80211_unhold_bss(wdev->current_bss);
 167                 cfg80211_put_bss(&wdev->current_bss->pub);
 168         }
 169
 170         wdev->current_bss = NULL;
 171         wdev->ssid_len = 0;
 172 #ifdef CONFIG_CFG80211_WEXT
 173         if (!nowext)
 174                 wdev->wext.ibss.ssid_len = 0;
 175 #endif
 176 }
 177
 178 void cfg80211_clear_ibss(struct net_device *dev, bool nowext)
 179 {
 180         struct wireless_dev *wdev = dev->ieee80211_ptr;
 181
 182         wdev_lock(wdev);
 183         __cfg80211_clear_ibss(dev, nowext);
 184         wdev_unlock(wdev);
 185 }
 186
 187 int __cfg80211_leave_ibss(struct cfg80211_registered_device *rdev,
 188                           struct net_device *dev, bool nowext)
 189 {
 190         struct wireless_dev *wdev = dev->ieee80211_ptr;
 191         int err;
 192
 193         ASSERT_WDEV_LOCK(wdev);
 194
 195         if (!wdev->ssid_len)
 196                 return -ENOLINK;
 197
 198         err = rdev->ops->leave_ibss(&rdev->wiphy, dev);
 199
 200         if (err)
 201                 return err;
 202
 203         __cfg80211_clear_ibss(dev, nowext);
 204
 205         return 0;
 206 }
 207
 208 int cfg80211_leave_ibss(struct cfg80211_registered_device *rdev,
 209                         struct net_device *dev, bool nowext)
 210 {
 211         struct wireless_dev *wdev = dev->ieee80211_ptr;
 212         int err;
 213
 214         wdev_lock(wdev);
 215         err = __cfg80211_leave_ibss(rdev, dev, nowext);
 216         wdev_unlock(wdev);
 217
 218         return err;
 219 }
 220
 221 #ifdef CONFIG_CFG80211_WEXT
 222 int cfg80211_ibss_wext_join(struct cfg80211_registered_device *rdev,
 223                             struct wireless_dev *wdev)
 224 {
 225         struct cfg80211_cached_keys *ck = NULL;
 226         enum ieee80211_band band;
 227         int i, err;
 228
 229         ASSERT_WDEV_LOCK(wdev);
 230
 231         if (!wdev->wext.ibss.beacon_interval)
 232                 wdev->wext.ibss.beacon_interval = 100;
 233
 234         /* try to find an IBSS channel if none requested ... */
 235         if (!wdev->wext.ibss.channel) {
 236                 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 237                         struct ieee80211_supported_band *sband;
 238                         struct ieee80211_channel *chan;
 239
 240                         sband = rdev->wiphy.bands[band];
 241                         if (!sband)
 242                                 continue;
 243
 244                         for (i = 0; i < sband->n_channels; i++) {
 245                                 chan = &sband->channels[i];
 246                                 if (chan->flags & IEEE80211_CHAN_NO_IBSS)
 247                                         continue;
 248                                 if (chan->flags & IEEE80211_CHAN_DISABLED)
 249                                         continue;
 250                                 wdev->wext.ibss.channel = chan;
 251                                 break;
 252                         }
 253
 254                         if (wdev->wext.ibss.channel)
 255                                 break;
 256                 }
 257
 258                 if (!wdev->wext.ibss.channel)
 259                         return -EINVAL;
 260         }
 261
 262         /* don't join -- SSID is not there */
 263         if (!wdev->wext.ibss.ssid_len)
 264                 return 0;
 265
 266         if (!netif_running(wdev->netdev))
 267                 return 0;
 268
 269         if (wdev->wext.keys) {
 270                 wdev->wext.keys->def = wdev->wext.default_key;
 271                 wdev->wext.keys->defmgmt = wdev->wext.default_mgmt_key;
 272         }
 273
 274         wdev->wext.ibss.privacy = wdev->wext.default_key != -1;
 275
 276         if (wdev->wext.keys) {
 277                 ck = kmemdup(wdev->wext.keys, sizeof(*ck), GFP_KERNEL);
 278                 if (!ck)
 279                         return -ENOMEM;
 280                 for (i = 0; i < 6; i++)
 281                         ck->params[i].key = ck->data[i];
 282         }
 283         err = __cfg80211_join_ibss(rdev, wdev->netdev,
 284                                    &wdev->wext.ibss, ck);
 285         if (err)
 286                 kfree(ck);
 287
 288         return err;
 289 }
 290
 291 int cfg80211_ibss_wext_siwfreq(struct net_device *dev,
 292                                struct iw_request_info *info,
 293                                struct iw_freq *wextfreq, char *extra)
 294 {
 295         struct wireless_dev *wdev = dev->ieee80211_ptr;
 296         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 297         struct ieee80211_channel *chan = NULL;
 298         int err, freq;
 299
 300         /* call only for ibss! */
 301         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
 302                 return -EINVAL;
 303
 304         if (!rdev->ops->join_ibss)
 305                 return -EOPNOTSUPP;
 306
 307         freq = cfg80211_wext_freq(wdev->wiphy, wextfreq);
 308         if (freq < 0)
 309                 return freq;
 310
 311         if (freq) {
 312                 chan = ieee80211_get_channel(wdev->wiphy, freq);
 313                 if (!chan)
 314                         return -EINVAL;
 315                 if (chan->flags & IEEE80211_CHAN_NO_IBSS ||
 316                     chan->flags & IEEE80211_CHAN_DISABLED)
 317                         return -EINVAL;
 318         }
 319
 320         if (wdev->wext.ibss.channel == chan)
 321                 return 0;
 322
 323         wdev_lock(wdev);
 324         err = 0;
 325         if (wdev->ssid_len)
 326                 err = __cfg80211_leave_ibss(rdev, dev, true);
 327         wdev_unlock(wdev);
 328
 329         if (err)
 330                 return err;
 331
 332         if (chan) {
 333                 wdev->wext.ibss.channel = chan;
 334                 wdev->wext.ibss.channel_fixed = true;
 335         } else {
 336                 /* cfg80211_ibss_wext_join will pick one if needed */
 337                 wdev->wext.ibss.channel_fixed = false;
 338         }
 339
 340         mutex_lock(&rdev->devlist_mtx);
 341         wdev_lock(wdev);
 342         err = cfg80211_ibss_wext_join(rdev, wdev);
 343         wdev_unlock(wdev);
 344         mutex_unlock(&rdev->devlist_mtx);
 345
 346         return err;
 347 }
 348
 349 int cfg80211_ibss_wext_giwfreq(struct net_device *dev,
 350                                struct iw_request_info *info,
 351                                struct iw_freq *freq, char *extra)
 352 {
 353         struct wireless_dev *wdev = dev->ieee80211_ptr;
 354         struct ieee80211_channel *chan = NULL;
 355
 356         /* call only for ibss! */
 357         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
 358                 return -EINVAL;
 359
 360         wdev_lock(wdev);
 361         if (wdev->current_bss)
 362                 chan = wdev->current_bss->pub.channel;
 363         else if (wdev->wext.ibss.channel)
 364                 chan = wdev->wext.ibss.channel;
 365         wdev_unlock(wdev);
 366
 367         if (chan) {
 368                 freq->m = chan->center_freq;
 369                 freq->e = 6;
 370                 return 0;
 371         }
 372
 373         /* no channel if not joining */
 374         return -EINVAL;
 375 }
 376
 377 int cfg80211_ibss_wext_siwessid(struct net_device *dev,
 378                                 struct iw_request_info *info,
 379                                 struct iw_point *data, char *ssid)
 380 {
 381         struct wireless_dev *wdev = dev->ieee80211_ptr;
 382         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 383         size_t len = data->length;
 384         int err;
 385
 386         /* call only for ibss! */
 387         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
 388                 return -EINVAL;
 389
 390         if (!rdev->ops->join_ibss)
 391                 return -EOPNOTSUPP;
 392
 393         wdev_lock(wdev);
 394         err = 0;
 395         if (wdev->ssid_len)
 396                 err = __cfg80211_leave_ibss(rdev, dev, true);
 397         wdev_unlock(wdev);
 398
 399         if (err)
 400                 return err;
 401
 402         /* iwconfig uses nul termination in SSID.. */
 403         if (len > 0 && ssid[len - 1] == '\0')
 404                 len--;
 405
 406         wdev->wext.ibss.ssid = wdev->ssid;
 407         memcpy(wdev->wext.ibss.ssid, ssid, len);
 408         wdev->wext.ibss.ssid_len = len;
 409
 410         mutex_lock(&rdev->devlist_mtx);
 411         wdev_lock(wdev);
 412         err = cfg80211_ibss_wext_join(rdev, wdev);
 413         wdev_unlock(wdev);
 414         mutex_unlock(&rdev->devlist_mtx);
 415
 416         return err;
 417 }
 418
 419 int cfg80211_ibss_wext_giwessid(struct net_device *dev,
 420                                 struct iw_request_info *info,
 421                                 struct iw_point *data, char *ssid)
 422 {
 423         struct wireless_dev *wdev = dev->ieee80211_ptr;
 424
 425         /* call only for ibss! */
 426         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
 427                 return -EINVAL;
 428
 429         data->flags = 0;
 430
 431         wdev_lock(wdev);
 432         if (wdev->ssid_len) {
 433                 data->flags = 1;
 434                 data->length = wdev->ssid_len;
 435                 memcpy(ssid, wdev->ssid, data->length);
 436         } else if (wdev->wext.ibss.ssid && wdev->wext.ibss.ssid_len) {
 437                 data->flags = 1;
 438                 data->length = wdev->wext.ibss.ssid_len;
 439                 memcpy(ssid, wdev->wext.ibss.ssid, data->length);
 440         }
 441         wdev_unlock(wdev);
 442
 443         return 0;
 444 }
 445
 446 int cfg80211_ibss_wext_siwap(struct net_device *dev,
 447                              struct iw_request_info *info,
 448                              struct sockaddr *ap_addr, char *extra)
 449 {
 450         struct wireless_dev *wdev = dev->ieee80211_ptr;
 451         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 452         u8 *bssid = ap_addr->sa_data;
 453         int err;
 454
 455         /* call only for ibss! */
 456         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
 457                 return -EINVAL;
 458
 459         if (!rdev->ops->join_ibss)
 460                 return -EOPNOTSUPP;
 461
 462         if (ap_addr->sa_family != ARPHRD_ETHER)
 463                 return -EINVAL;
 464
 465         /* automatic mode */
 466         if (is_zero_ether_addr(bssid) || is_broadcast_ether_addr(bssid))
 467                 bssid = NULL;
 468
 469         /* both automatic */
 470         if (!bssid && !wdev->wext.ibss.bssid)
 471                 return 0;
 472
 473         /* fixed already - and no change */
 474         if (wdev->wext.ibss.bssid && bssid &&
 475             compare_ether_addr(bssid, wdev->wext.ibss.bssid) == 0)
 476                 return 0;
 477
 478         wdev_lock(wdev);
 479         err = 0;
 480         if (wdev->ssid_len)
 481                 err = __cfg80211_leave_ibss(rdev, dev, true);
 482         wdev_unlock(wdev);
 483
 484         if (err)
 485                 return err;
 486
 487         if (bssid) {
 488                 memcpy(wdev->wext.bssid, bssid, ETH_ALEN);
 489                 wdev->wext.ibss.bssid = wdev->wext.bssid;
 490         } else
 491                 wdev->wext.ibss.bssid = NULL;
 492
 493         mutex_lock(&rdev->devlist_mtx);
 494         wdev_lock(wdev);
 495         err = cfg80211_ibss_wext_join(rdev, wdev);
 496         wdev_unlock(wdev);
 497         mutex_unlock(&rdev->devlist_mtx);
 498
 499         return err;
 500 }
 501
 502 int cfg80211_ibss_wext_giwap(struct net_device *dev,
 503                              struct iw_request_info *info,
 504                              struct sockaddr *ap_addr, char *extra)
 505 {
 506         struct wireless_dev *wdev = dev->ieee80211_ptr;
 507
 508         /* call only for ibss! */
 509         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
 510                 return -EINVAL;
 511
 512         ap_addr->sa_family = ARPHRD_ETHER;
 513
 514         wdev_lock(wdev);
 515         if (wdev->current_bss)
 516                 memcpy(ap_addr->sa_data, wdev->current_bss->pub.bssid, ETH_ALEN);
 517         else if (wdev->wext.ibss.bssid)
 518                 memcpy(ap_addr->sa_data, wdev->wext.ibss.bssid, ETH_ALEN);
 519         else
 520                 memset(ap_addr->sa_data, 0, ETH_ALEN);
 521
 522         wdev_unlock(wdev);
 523
 524         return 0;
 525 }
 526 #endif