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