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 {
  19         struct wireless_dev *wdev = dev->ieee80211_ptr;
  20         struct cfg80211_bss *bss;
  21 #ifdef CONFIG_CFG80211_WEXT
  22         union iwreq_data wrqu;
  23 #endif
  24
  25         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
  26                 return;
  27
  28         if (!wdev->ssid_len)
  29                 return;
  30
  31         bss = cfg80211_get_bss(wdev->wiphy, NULL, bssid,
  32                                wdev->ssid, wdev->ssid_len,
  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, gfp_t gfp)
  58 {
  59         struct wireless_dev *wdev = dev->ieee80211_ptr;
  60         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
  61         struct cfg80211_event *ev;
  62         unsigned long flags;
  63
  64         trace_cfg80211_ibss_joined(dev, bssid);
  65
  66         ev = kzalloc(sizeof(*ev), gfp);
  67         if (!ev)
  68                 return;
  69
  70         ev->type = EVENT_IBSS_JOINED;
  71         memcpy(ev->cr.bssid, bssid, ETH_ALEN);
  72
  73         spin_lock_irqsave(&wdev->event_lock, flags);
  74         list_add_tail(&ev->list, &wdev->event_list);
  75         spin_unlock_irqrestore(&wdev->event_lock, flags);
  76         queue_work(cfg80211_wq, &rdev->event_work);
  77 }
  78 EXPORT_SYMBOL(cfg80211_ibss_joined);
  79
  80 int __cfg80211_join_ibss(struct cfg80211_registered_device *rdev,
  81                          struct net_device *dev,
  82                          struct cfg80211_ibss_params *params,
  83                          struct cfg80211_cached_keys *connkeys)
  84 {
  85         struct wireless_dev *wdev = dev->ieee80211_ptr;
  86         int err;
  87
  88         ASSERT_WDEV_LOCK(wdev);
  89
  90         if (wdev->ssid_len)
  91                 return -EALREADY;
  92
  93         if (!params->basic_rates) {
  94                 /*
  95                 * If no rates were explicitly configured,
  96                 * use the mandatory rate set for 11b or
  97                 * 11a for maximum compatibility.
  98                 */
  99                 struct ieee80211_supported_band *sband =
 100                         rdev->wiphy.bands[params->chandef.chan->band];
 101                 int j;
 102                 u32 flag = params->chandef.chan->band == IEEE80211_BAND_5GHZ ?
 103                         IEEE80211_RATE_MANDATORY_A :
 104                         IEEE80211_RATE_MANDATORY_B;
 105
 106                 for (j = 0; j < sband->n_bitrates; j++) {
 107                         if (sband->bitrates[j].flags & flag)
 108                                 params->basic_rates |= BIT(j);
 109                 }
 110         }
 111
 112         if (WARN_ON(wdev->connect_keys))
 113                 kfree(wdev->connect_keys);
 114         wdev->connect_keys = connkeys;
 115
 116         wdev->ibss_fixed = params->channel_fixed;
 117 #ifdef CONFIG_CFG80211_WEXT
 118         wdev->wext.ibss.chandef = params->chandef;
 119 #endif
 120
 121         err = cfg80211_can_use_chan(rdev, wdev, params->chandef.chan,
 122                                     params->channel_fixed
 123                                     ? CHAN_MODE_SHARED
 124                                     : CHAN_MODE_EXCLUSIVE);
 125         if (err) {
 126                 wdev->connect_keys = NULL;
 127                 return err;
 128         }
 129
 130         err = rdev_join_ibss(rdev, dev, params);
 131         if (err) {
 132                 wdev->connect_keys = NULL;
 133                 return err;
 134         }
 135
 136         memcpy(wdev->ssid, params->ssid, params->ssid_len);
 137         wdev->ssid_len = params->ssid_len;
 138
 139         return 0;
 140 }
 141
 142 int cfg80211_join_ibss(struct cfg80211_registered_device *rdev,
 143                        struct net_device *dev,
 144                        struct cfg80211_ibss_params *params,
 145                        struct cfg80211_cached_keys *connkeys)
 146 {
 147         struct wireless_dev *wdev = dev->ieee80211_ptr;
 148         int err;
 149
 150         ASSERT_RTNL();
 151
 152         wdev_lock(wdev);
 153         err = __cfg80211_join_ibss(rdev, dev, params, connkeys);
 154         wdev_unlock(wdev);
 155
 156         return err;
 157 }
 158
 159 static void __cfg80211_clear_ibss(struct net_device *dev, bool nowext)
 160 {
 161         struct wireless_dev *wdev = dev->ieee80211_ptr;
 162         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 163         int i;
 164
 165         ASSERT_WDEV_LOCK(wdev);
 166
 167         kfree(wdev->connect_keys);
 168         wdev->connect_keys = NULL;
 169
 170         /*
 171          * Delete all the keys ... pairwise keys can't really
 172          * exist any more anyway, but default keys might.
 173          */
 174         if (rdev->ops->del_key)
 175                 for (i = 0; i < 6; i++)
 176                         rdev_del_key(rdev, dev, i, false, NULL);
 177
 178         if (wdev->current_bss) {
 179                 cfg80211_unhold_bss(wdev->current_bss);
 180                 cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
 181         }
 182
 183         wdev->current_bss = NULL;
 184         wdev->ssid_len = 0;
 185 #ifdef CONFIG_CFG80211_WEXT
 186         if (!nowext)
 187                 wdev->wext.ibss.ssid_len = 0;
 188 #endif
 189 }
 190
 191 void cfg80211_clear_ibss(struct net_device *dev, bool nowext)
 192 {
 193         struct wireless_dev *wdev = dev->ieee80211_ptr;
 194
 195         wdev_lock(wdev);
 196         __cfg80211_clear_ibss(dev, nowext);
 197         wdev_unlock(wdev);
 198 }
 199
 200 int __cfg80211_leave_ibss(struct cfg80211_registered_device *rdev,
 201                           struct net_device *dev, bool nowext)
 202 {
 203         struct wireless_dev *wdev = dev->ieee80211_ptr;
 204         int err;
 205
 206         ASSERT_WDEV_LOCK(wdev);
 207
 208         if (!wdev->ssid_len)
 209                 return -ENOLINK;
 210
 211         err = rdev_leave_ibss(rdev, dev);
 212
 213         if (err)
 214                 return err;
 215
 216         __cfg80211_clear_ibss(dev, nowext);
 217
 218         return 0;
 219 }
 220
 221 int cfg80211_leave_ibss(struct cfg80211_registered_device *rdev,
 222                         struct net_device *dev, bool nowext)
 223 {
 224         struct wireless_dev *wdev = dev->ieee80211_ptr;
 225         int err;
 226
 227         wdev_lock(wdev);
 228         err = __cfg80211_leave_ibss(rdev, dev, nowext);
 229         wdev_unlock(wdev);
 230
 231         return err;
 232 }
 233
 234 #ifdef CONFIG_CFG80211_WEXT
 235 int cfg80211_ibss_wext_join(struct cfg80211_registered_device *rdev,
 236                             struct wireless_dev *wdev)
 237 {
 238         struct cfg80211_cached_keys *ck = NULL;
 239         enum ieee80211_band band;
 240         int i, err;
 241
 242         ASSERT_WDEV_LOCK(wdev);
 243
 244         if (!wdev->wext.ibss.beacon_interval)
 245                 wdev->wext.ibss.beacon_interval = 100;
 246
 247         /* try to find an IBSS channel if none requested ... */
 248         if (!wdev->wext.ibss.chandef.chan) {
 249                 wdev->wext.ibss.chandef.width = NL80211_CHAN_WIDTH_20_NOHT;
 250
 251                 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 252                         struct ieee80211_supported_band *sband;
 253                         struct ieee80211_channel *chan;
 254
 255                         sband = rdev->wiphy.bands[band];
 256                         if (!sband)
 257                                 continue;
 258
 259                         for (i = 0; i < sband->n_channels; i++) {
 260                                 chan = &sband->channels[i];
 261                                 if (chan->flags & IEEE80211_CHAN_NO_IBSS)
 262                                         continue;
 263                                 if (chan->flags & IEEE80211_CHAN_DISABLED)
 264                                         continue;
 265                                 wdev->wext.ibss.chandef.chan = chan;
 266                                 wdev->wext.ibss.chandef.center_freq1 =
 267                                         chan->center_freq;
 268                                 break;
 269                         }
 270
 271                         if (wdev->wext.ibss.chandef.chan)
 272                                 break;
 273                 }
 274
 275                 if (!wdev->wext.ibss.chandef.chan)
 276                         return -EINVAL;
 277         }
 278
 279         /* don't join -- SSID is not there */
 280         if (!wdev->wext.ibss.ssid_len)
 281                 return 0;
 282
 283         if (!netif_running(wdev->netdev))
 284                 return 0;
 285
 286         if (wdev->wext.keys) {
 287                 wdev->wext.keys->def = wdev->wext.default_key;
 288                 wdev->wext.keys->defmgmt = wdev->wext.default_mgmt_key;
 289         }
 290
 291         wdev->wext.ibss.privacy = wdev->wext.default_key != -1;
 292
 293         if (wdev->wext.keys) {
 294                 ck = kmemdup(wdev->wext.keys, sizeof(*ck), GFP_KERNEL);
 295                 if (!ck)
 296                         return -ENOMEM;
 297                 for (i = 0; i < 6; i++)
 298                         ck->params[i].key = ck->data[i];
 299         }
 300         err = __cfg80211_join_ibss(rdev, wdev->netdev,
 301                                    &wdev->wext.ibss, ck);
 302         if (err)
 303                 kfree(ck);
 304
 305         return err;
 306 }
 307
 308 int cfg80211_ibss_wext_siwfreq(struct net_device *dev,
 309                                struct iw_request_info *info,
 310                                struct iw_freq *wextfreq, char *extra)
 311 {
 312         struct wireless_dev *wdev = dev->ieee80211_ptr;
 313         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 314         struct ieee80211_channel *chan = NULL;
 315         int err, freq;
 316
 317         /* call only for ibss! */
 318         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
 319                 return -EINVAL;
 320
 321         if (!rdev->ops->join_ibss)
 322                 return -EOPNOTSUPP;
 323
 324         freq = cfg80211_wext_freq(wdev->wiphy, wextfreq);
 325         if (freq < 0)
 326                 return freq;
 327
 328         if (freq) {
 329                 chan = ieee80211_get_channel(wdev->wiphy, freq);
 330                 if (!chan)
 331                         return -EINVAL;
 332                 if (chan->flags & IEEE80211_CHAN_NO_IBSS ||
 333                     chan->flags & IEEE80211_CHAN_DISABLED)
 334                         return -EINVAL;
 335         }
 336
 337         if (wdev->wext.ibss.chandef.chan == chan)
 338                 return 0;
 339
 340         wdev_lock(wdev);
 341         err = 0;
 342         if (wdev->ssid_len)
 343                 err = __cfg80211_leave_ibss(rdev, dev, true);
 344         wdev_unlock(wdev);
 345
 346         if (err)
 347                 return err;
 348
 349         if (chan) {
 350                 wdev->wext.ibss.chandef.chan = chan;
 351                 wdev->wext.ibss.chandef.width = NL80211_CHAN_WIDTH_20_NOHT;
 352                 wdev->wext.ibss.chandef.center_freq1 = freq;
 353                 wdev->wext.ibss.channel_fixed = true;
 354         } else {
 355                 /* cfg80211_ibss_wext_join will pick one if needed */
 356                 wdev->wext.ibss.channel_fixed = false;
 357         }
 358
 359         wdev_lock(wdev);
 360         err = cfg80211_ibss_wext_join(rdev, wdev);
 361         wdev_unlock(wdev);
 362
 363         return err;
 364 }
 365
 366 int cfg80211_ibss_wext_giwfreq(struct net_device *dev,
 367                                struct iw_request_info *info,
 368                                struct iw_freq *freq, char *extra)
 369 {
 370         struct wireless_dev *wdev = dev->ieee80211_ptr;
 371         struct ieee80211_channel *chan = NULL;
 372
 373         /* call only for ibss! */
 374         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
 375                 return -EINVAL;
 376
 377         wdev_lock(wdev);
 378         if (wdev->current_bss)
 379                 chan = wdev->current_bss->pub.channel;
 380         else if (wdev->wext.ibss.chandef.chan)
 381                 chan = wdev->wext.ibss.chandef.chan;
 382         wdev_unlock(wdev);
 383
 384         if (chan) {
 385                 freq->m = chan->center_freq;
 386                 freq->e = 6;
 387                 return 0;
 388         }
 389
 390         /* no channel if not joining */
 391         return -EINVAL;
 392 }
 393
 394 int cfg80211_ibss_wext_siwessid(struct net_device *dev,
 395                                 struct iw_request_info *info,
 396                                 struct iw_point *data, char *ssid)
 397 {
 398         struct wireless_dev *wdev = dev->ieee80211_ptr;
 399         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 400         size_t len = data->length;
 401         int err;
 402
 403         /* call only for ibss! */
 404         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
 405                 return -EINVAL;
 406
 407         if (!rdev->ops->join_ibss)
 408                 return -EOPNOTSUPP;
 409
 410         wdev_lock(wdev);
 411         err = 0;
 412         if (wdev->ssid_len)
 413                 err = __cfg80211_leave_ibss(rdev, dev, true);
 414         wdev_unlock(wdev);
 415
 416         if (err)
 417                 return err;
 418
 419         /* iwconfig uses nul termination in SSID.. */
 420         if (len > 0 && ssid[len - 1] == '\0')
 421                 len--;
 422
 423         wdev->wext.ibss.ssid = wdev->ssid;
 424         memcpy(wdev->wext.ibss.ssid, ssid, len);
 425         wdev->wext.ibss.ssid_len = len;
 426
 427         wdev_lock(wdev);
 428         err = cfg80211_ibss_wext_join(rdev, wdev);
 429         wdev_unlock(wdev);
 430
 431         return err;
 432 }
 433
 434 int cfg80211_ibss_wext_giwessid(struct net_device *dev,
 435                                 struct iw_request_info *info,
 436                                 struct iw_point *data, char *ssid)
 437 {
 438         struct wireless_dev *wdev = dev->ieee80211_ptr;
 439
 440         /* call only for ibss! */
 441         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
 442                 return -EINVAL;
 443
 444         data->flags = 0;
 445
 446         wdev_lock(wdev);
 447         if (wdev->ssid_len) {
 448                 data->flags = 1;
 449                 data->length = wdev->ssid_len;
 450                 memcpy(ssid, wdev->ssid, data->length);
 451         } else if (wdev->wext.ibss.ssid && wdev->wext.ibss.ssid_len) {
 452                 data->flags = 1;
 453                 data->length = wdev->wext.ibss.ssid_len;
 454                 memcpy(ssid, wdev->wext.ibss.ssid, data->length);
 455         }
 456         wdev_unlock(wdev);
 457
 458         return 0;
 459 }
 460
 461 int cfg80211_ibss_wext_siwap(struct net_device *dev,
 462                              struct iw_request_info *info,
 463                              struct sockaddr *ap_addr, char *extra)
 464 {
 465         struct wireless_dev *wdev = dev->ieee80211_ptr;
 466         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 467         u8 *bssid = ap_addr->sa_data;
 468         int err;
 469
 470         /* call only for ibss! */
 471         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
 472                 return -EINVAL;
 473
 474         if (!rdev->ops->join_ibss)
 475                 return -EOPNOTSUPP;
 476
 477         if (ap_addr->sa_family != ARPHRD_ETHER)
 478                 return -EINVAL;
 479
 480         /* automatic mode */
 481         if (is_zero_ether_addr(bssid) || is_broadcast_ether_addr(bssid))
 482                 bssid = NULL;
 483
 484         /* both automatic */
 485         if (!bssid && !wdev->wext.ibss.bssid)
 486                 return 0;
 487
 488         /* fixed already - and no change */
 489         if (wdev->wext.ibss.bssid && bssid &&
 490             ether_addr_equal(bssid, wdev->wext.ibss.bssid))
 491                 return 0;
 492
 493         wdev_lock(wdev);
 494         err = 0;
 495         if (wdev->ssid_len)
 496                 err = __cfg80211_leave_ibss(rdev, dev, true);
 497         wdev_unlock(wdev);
 498
 499         if (err)
 500                 return err;
 501
 502         if (bssid) {
 503                 memcpy(wdev->wext.bssid, bssid, ETH_ALEN);
 504                 wdev->wext.ibss.bssid = wdev->wext.bssid;
 505         } else
 506                 wdev->wext.ibss.bssid = NULL;
 507
 508         wdev_lock(wdev);
 509         err = cfg80211_ibss_wext_join(rdev, wdev);
 510         wdev_unlock(wdev);
 511
 512         return err;
 513 }
 514
 515 int cfg80211_ibss_wext_giwap(struct net_device *dev,
 516                              struct iw_request_info *info,
 517                              struct sockaddr *ap_addr, char *extra)
 518 {
 519         struct wireless_dev *wdev = dev->ieee80211_ptr;
 520
 521         /* call only for ibss! */
 522         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
 523                 return -EINVAL;
 524
 525         ap_addr->sa_family = ARPHRD_ETHER;
 526
 527         wdev_lock(wdev);
 528         if (wdev->current_bss)
 529                 memcpy(ap_addr->sa_data, wdev->current_bss->pub.bssid, ETH_ALEN);
 530         else if (wdev->wext.ibss.bssid)
 531                 memcpy(ap_addr->sa_data, wdev->wext.ibss.bssid, ETH_ALEN);
 532         else
 533                 memset(ap_addr->sa_data, 0, ETH_ALEN);
 534
 535         wdev_unlock(wdev);
 536
 537         return 0;
 538 }
 539 #endif