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