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 (WARN_ON(wdev->connect_keys))
  92                 kfree(wdev->connect_keys);
  93         wdev->connect_keys = connkeys;
  94
  95 #ifdef CONFIG_CFG80211_WEXT
  96         wdev->wext.ibss.channel = params->channel;
  97 #endif
  98         err = rdev->ops->join_ibss(&rdev->wiphy, dev, params);
  99         if (err) {
 100                 wdev->connect_keys = NULL;
 101                 return err;
 102         }
 103
 104         memcpy(wdev->ssid, params->ssid, params->ssid_len);
 105         wdev->ssid_len = params->ssid_len;
 106
 107         return 0;
 108 }
 109
 110 int cfg80211_join_ibss(struct cfg80211_registered_device *rdev,
 111                        struct net_device *dev,
 112                        struct cfg80211_ibss_params *params,
 113                        struct cfg80211_cached_keys *connkeys)
 114 {
 115         struct wireless_dev *wdev = dev->ieee80211_ptr;
 116         int err;
 117
 118         mutex_lock(&rdev->devlist_mtx);
 119         wdev_lock(wdev);
 120         err = __cfg80211_join_ibss(rdev, dev, params, connkeys);
 121         wdev_unlock(wdev);
 122         mutex_unlock(&rdev->devlist_mtx);
 123
 124         return err;
 125 }
 126
 127 static void __cfg80211_clear_ibss(struct net_device *dev, bool nowext)
 128 {
 129         struct wireless_dev *wdev = dev->ieee80211_ptr;
 130         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 131         int i;
 132
 133         ASSERT_WDEV_LOCK(wdev);
 134
 135         kfree(wdev->connect_keys);
 136         wdev->connect_keys = NULL;
 137
 138         /*
 139          * Delete all the keys ... pairwise keys can't really
 140          * exist any more anyway, but default keys might.
 141          */
 142         if (rdev->ops->del_key)
 143                 for (i = 0; i < 6; i++)
 144                         rdev->ops->del_key(wdev->wiphy, dev, i, NULL);
 145
 146         if (wdev->current_bss) {
 147                 cfg80211_unhold_bss(wdev->current_bss);
 148                 cfg80211_put_bss(&wdev->current_bss->pub);
 149         }
 150
 151         wdev->current_bss = NULL;
 152         wdev->ssid_len = 0;
 153 #ifdef CONFIG_CFG80211_WEXT
 154         if (!nowext)
 155                 wdev->wext.ibss.ssid_len = 0;
 156 #endif
 157 }
 158
 159 void cfg80211_clear_ibss(struct net_device *dev, bool nowext)
 160 {
 161         struct wireless_dev *wdev = dev->ieee80211_ptr;
 162
 163         wdev_lock(wdev);
 164         __cfg80211_clear_ibss(dev, nowext);
 165         wdev_unlock(wdev);
 166 }
 167
 168 int __cfg80211_leave_ibss(struct cfg80211_registered_device *rdev,
 169                           struct net_device *dev, bool nowext)
 170 {
 171         struct wireless_dev *wdev = dev->ieee80211_ptr;
 172         int err;
 173
 174         ASSERT_WDEV_LOCK(wdev);
 175
 176         if (!wdev->ssid_len)
 177                 return -ENOLINK;
 178
 179         err = rdev->ops->leave_ibss(&rdev->wiphy, dev);
 180
 181         if (err)
 182                 return err;
 183
 184         __cfg80211_clear_ibss(dev, nowext);
 185
 186         return 0;
 187 }
 188
 189 int cfg80211_leave_ibss(struct cfg80211_registered_device *rdev,
 190                         struct net_device *dev, bool nowext)
 191 {
 192         struct wireless_dev *wdev = dev->ieee80211_ptr;
 193         int err;
 194
 195         wdev_lock(wdev);
 196         err = __cfg80211_leave_ibss(rdev, dev, nowext);
 197         wdev_unlock(wdev);
 198
 199         return err;
 200 }
 201
 202 #ifdef CONFIG_CFG80211_WEXT
 203 int cfg80211_ibss_wext_join(struct cfg80211_registered_device *rdev,
 204                             struct wireless_dev *wdev)
 205 {
 206         struct cfg80211_cached_keys *ck = NULL;
 207         enum ieee80211_band band;
 208         int i, err;
 209
 210         ASSERT_WDEV_LOCK(wdev);
 211
 212         if (!wdev->wext.ibss.beacon_interval)
 213                 wdev->wext.ibss.beacon_interval = 100;
 214
 215         /* try to find an IBSS channel if none requested ... */
 216         if (!wdev->wext.ibss.channel) {
 217                 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 218                         struct ieee80211_supported_band *sband;
 219                         struct ieee80211_channel *chan;
 220
 221                         sband = rdev->wiphy.bands[band];
 222                         if (!sband)
 223                                 continue;
 224
 225                         for (i = 0; i < sband->n_channels; i++) {
 226                                 chan = &sband->channels[i];
 227                                 if (chan->flags & IEEE80211_CHAN_NO_IBSS)
 228                                         continue;
 229                                 if (chan->flags & IEEE80211_CHAN_DISABLED)
 230                                         continue;
 231                                 wdev->wext.ibss.channel = chan;
 232                                 break;
 233                         }
 234
 235                         if (wdev->wext.ibss.channel)
 236                                 break;
 237                 }
 238
 239                 if (!wdev->wext.ibss.channel)
 240                         return -EINVAL;
 241         }
 242
 243         /* don't join -- SSID is not there */
 244         if (!wdev->wext.ibss.ssid_len)
 245                 return 0;
 246
 247         if (!netif_running(wdev->netdev))
 248                 return 0;
 249
 250         if (wdev->wext.keys) {
 251                 wdev->wext.keys->def = wdev->wext.default_key;
 252                 wdev->wext.keys->defmgmt = wdev->wext.default_mgmt_key;
 253         }
 254
 255         wdev->wext.ibss.privacy = wdev->wext.default_key != -1;
 256
 257         if (wdev->wext.keys) {
 258                 ck = kmemdup(wdev->wext.keys, sizeof(*ck), GFP_KERNEL);
 259                 if (!ck)
 260                         return -ENOMEM;
 261                 for (i = 0; i < 6; i++)
 262                         ck->params[i].key = ck->data[i];
 263         }
 264         err = __cfg80211_join_ibss(rdev, wdev->netdev,
 265                                    &wdev->wext.ibss, ck);
 266         if (err)
 267                 kfree(ck);
 268
 269         return err;
 270 }
 271
 272 int cfg80211_ibss_wext_siwfreq(struct net_device *dev,
 273                                struct iw_request_info *info,
 274                                struct iw_freq *wextfreq, char *extra)
 275 {
 276         struct wireless_dev *wdev = dev->ieee80211_ptr;
 277         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 278         struct ieee80211_channel *chan = NULL;
 279         int err, freq;
 280
 281         /* call only for ibss! */
 282         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
 283                 return -EINVAL;
 284
 285         if (!rdev->ops->join_ibss)
 286                 return -EOPNOTSUPP;
 287
 288         freq = cfg80211_wext_freq(wdev->wiphy, wextfreq);
 289         if (freq < 0)
 290                 return freq;
 291
 292         if (freq) {
 293                 chan = ieee80211_get_channel(wdev->wiphy, freq);
 294                 if (!chan)
 295                         return -EINVAL;
 296                 if (chan->flags & IEEE80211_CHAN_NO_IBSS ||
 297                     chan->flags & IEEE80211_CHAN_DISABLED)
 298                         return -EINVAL;
 299         }
 300
 301         if (wdev->wext.ibss.channel == chan)
 302                 return 0;
 303
 304         wdev_lock(wdev);
 305         err = 0;
 306         if (wdev->ssid_len)
 307                 err = __cfg80211_leave_ibss(rdev, dev, true);
 308         wdev_unlock(wdev);
 309
 310         if (err)
 311                 return err;
 312
 313         if (chan) {
 314                 wdev->wext.ibss.channel = chan;
 315                 wdev->wext.ibss.channel_fixed = true;
 316         } else {
 317                 /* cfg80211_ibss_wext_join will pick one if needed */
 318                 wdev->wext.ibss.channel_fixed = false;
 319         }
 320
 321         mutex_lock(&rdev->devlist_mtx);
 322         wdev_lock(wdev);
 323         err = cfg80211_ibss_wext_join(rdev, wdev);
 324         wdev_unlock(wdev);
 325         mutex_unlock(&rdev->devlist_mtx);
 326
 327         return err;
 328 }
 329
 330 int cfg80211_ibss_wext_giwfreq(struct net_device *dev,
 331                                struct iw_request_info *info,
 332                                struct iw_freq *freq, char *extra)
 333 {
 334         struct wireless_dev *wdev = dev->ieee80211_ptr;
 335         struct ieee80211_channel *chan = NULL;
 336
 337         /* call only for ibss! */
 338         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
 339                 return -EINVAL;
 340
 341         wdev_lock(wdev);
 342         if (wdev->current_bss)
 343                 chan = wdev->current_bss->pub.channel;
 344         else if (wdev->wext.ibss.channel)
 345                 chan = wdev->wext.ibss.channel;
 346         wdev_unlock(wdev);
 347
 348         if (chan) {
 349                 freq->m = chan->center_freq;
 350                 freq->e = 6;
 351                 return 0;
 352         }
 353
 354         /* no channel if not joining */
 355         return -EINVAL;
 356 }
 357
 358 int cfg80211_ibss_wext_siwessid(struct net_device *dev,
 359                                 struct iw_request_info *info,
 360                                 struct iw_point *data, char *ssid)
 361 {
 362         struct wireless_dev *wdev = dev->ieee80211_ptr;
 363         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 364         size_t len = data->length;
 365         int err;
 366
 367         /* call only for ibss! */
 368         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
 369                 return -EINVAL;
 370
 371         if (!rdev->ops->join_ibss)
 372                 return -EOPNOTSUPP;
 373
 374         wdev_lock(wdev);
 375         err = 0;
 376         if (wdev->ssid_len)
 377                 err = __cfg80211_leave_ibss(rdev, dev, true);
 378         wdev_unlock(wdev);
 379
 380         if (err)
 381                 return err;
 382
 383         /* iwconfig uses nul termination in SSID.. */
 384         if (len > 0 && ssid[len - 1] == '\0')
 385                 len--;
 386
 387         wdev->wext.ibss.ssid = wdev->ssid;
 388         memcpy(wdev->wext.ibss.ssid, ssid, len);
 389         wdev->wext.ibss.ssid_len = len;
 390
 391         mutex_lock(&rdev->devlist_mtx);
 392         wdev_lock(wdev);
 393         err = cfg80211_ibss_wext_join(rdev, wdev);
 394         wdev_unlock(wdev);
 395         mutex_unlock(&rdev->devlist_mtx);
 396
 397         return err;
 398 }
 399
 400 int cfg80211_ibss_wext_giwessid(struct net_device *dev,
 401                                 struct iw_request_info *info,
 402                                 struct iw_point *data, char *ssid)
 403 {
 404         struct wireless_dev *wdev = dev->ieee80211_ptr;
 405
 406         /* call only for ibss! */
 407         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
 408                 return -EINVAL;
 409
 410         data->flags = 0;
 411
 412         wdev_lock(wdev);
 413         if (wdev->ssid_len) {
 414                 data->flags = 1;
 415                 data->length = wdev->ssid_len;
 416                 memcpy(ssid, wdev->ssid, data->length);
 417         } else if (wdev->wext.ibss.ssid && wdev->wext.ibss.ssid_len) {
 418                 data->flags = 1;
 419                 data->length = wdev->wext.ibss.ssid_len;
 420                 memcpy(ssid, wdev->wext.ibss.ssid, data->length);
 421         }
 422         wdev_unlock(wdev);
 423
 424         return 0;
 425 }
 426
 427 int cfg80211_ibss_wext_siwap(struct net_device *dev,
 428                              struct iw_request_info *info,
 429                              struct sockaddr *ap_addr, char *extra)
 430 {
 431         struct wireless_dev *wdev = dev->ieee80211_ptr;
 432         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 433         u8 *bssid = ap_addr->sa_data;
 434         int err;
 435
 436         /* call only for ibss! */
 437         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
 438                 return -EINVAL;
 439
 440         if (!rdev->ops->join_ibss)
 441                 return -EOPNOTSUPP;
 442
 443         if (ap_addr->sa_family != ARPHRD_ETHER)
 444                 return -EINVAL;
 445
 446         /* automatic mode */
 447         if (is_zero_ether_addr(bssid) || is_broadcast_ether_addr(bssid))
 448                 bssid = NULL;
 449
 450         /* both automatic */
 451         if (!bssid && !wdev->wext.ibss.bssid)
 452                 return 0;
 453
 454         /* fixed already - and no change */
 455         if (wdev->wext.ibss.bssid && bssid &&
 456             compare_ether_addr(bssid, wdev->wext.ibss.bssid) == 0)
 457                 return 0;
 458
 459         wdev_lock(wdev);
 460         err = 0;
 461         if (wdev->ssid_len)
 462                 err = __cfg80211_leave_ibss(rdev, dev, true);
 463         wdev_unlock(wdev);
 464
 465         if (err)
 466                 return err;
 467
 468         if (bssid) {
 469                 memcpy(wdev->wext.bssid, bssid, ETH_ALEN);
 470                 wdev->wext.ibss.bssid = wdev->wext.bssid;
 471         } else
 472                 wdev->wext.ibss.bssid = NULL;
 473
 474         mutex_lock(&rdev->devlist_mtx);
 475         wdev_lock(wdev);
 476         err = cfg80211_ibss_wext_join(rdev, wdev);
 477         wdev_unlock(wdev);
 478         mutex_unlock(&rdev->devlist_mtx);
 479
 480         return err;
 481 }
 482
 483 int cfg80211_ibss_wext_giwap(struct net_device *dev,
 484                              struct iw_request_info *info,
 485                              struct sockaddr *ap_addr, char *extra)
 486 {
 487         struct wireless_dev *wdev = dev->ieee80211_ptr;
 488
 489         /* call only for ibss! */
 490         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
 491                 return -EINVAL;
 492
 493         ap_addr->sa_family = ARPHRD_ETHER;
 494
 495         wdev_lock(wdev);
 496         if (wdev->current_bss)
 497                 memcpy(ap_addr->sa_data, wdev->current_bss->pub.bssid, ETH_ALEN);
 498         else if (wdev->wext.ibss.bssid)
 499                 memcpy(ap_addr->sa_data, wdev->wext.ibss.bssid, ETH_ALEN);
 500         else
 501                 memset(ap_addr->sa_data, 0, ETH_ALEN);
 502
 503         wdev_unlock(wdev);
 504
 505         return 0;
 506 }
 507 #endif