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         wdev->sme_state = CFG80211_SME_CONNECTED;
  47         cfg80211_upload_connect_keys(wdev);
  48
  49         nl80211_send_ibss_bssid(wiphy_to_dev(wdev->wiphy), dev, bssid,
  50                                 GFP_KERNEL);
  51 #ifdef CONFIG_CFG80211_WEXT
  52         memset(&wrqu, 0, sizeof(wrqu));
  53         memcpy(wrqu.ap_addr.sa_data, bssid, ETH_ALEN);
  54         wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL);
  55 #endif
  56 }
  57
  58 void cfg80211_ibss_joined(struct net_device *dev, const u8 *bssid, gfp_t gfp)
  59 {
  60         struct wireless_dev *wdev = dev->ieee80211_ptr;
  61         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
  62         struct cfg80211_event *ev;
  63         unsigned long flags;
  64
  65         trace_cfg80211_ibss_joined(dev, bssid);
  66
  67         CFG80211_DEV_WARN_ON(wdev->sme_state != CFG80211_SME_CONNECTING);
  68
  69         ev = kzalloc(sizeof(*ev), gfp);
  70         if (!ev)
  71                 return;
  72
  73         ev->type = EVENT_IBSS_JOINED;
  74         memcpy(ev->cr.bssid, bssid, ETH_ALEN);
  75
  76         spin_lock_irqsave(&wdev->event_lock, flags);
  77         list_add_tail(&ev->list, &wdev->event_list);
  78         spin_unlock_irqrestore(&wdev->event_lock, flags);
  79         queue_work(cfg80211_wq, &rdev->event_work);
  80 }
  81 EXPORT_SYMBOL(cfg80211_ibss_joined);
  82
  83 int __cfg80211_join_ibss(struct cfg80211_registered_device *rdev,
  84                          struct net_device *dev,
  85                          struct cfg80211_ibss_params *params,
  86                          struct cfg80211_cached_keys *connkeys)
  87 {
  88         struct wireless_dev *wdev = dev->ieee80211_ptr;
  89         int err;
  90
  91         ASSERT_WDEV_LOCK(wdev);
  92
  93         if (wdev->ssid_len)
  94                 return -EALREADY;
  95
  96         if (!params->basic_rates) {
  97                 /*
  98                 * If no rates were explicitly configured,
  99                 * use the mandatory rate set for 11b or
 100                 * 11a for maximum compatibility.
 101                 */
 102                 struct ieee80211_supported_band *sband =
 103                         rdev->wiphy.bands[params->chandef.chan->band];
 104                 int j;
 105                 u32 flag = params->chandef.chan->band == IEEE80211_BAND_5GHZ ?
 106                         IEEE80211_RATE_MANDATORY_A :
 107                         IEEE80211_RATE_MANDATORY_B;
 108
 109                 for (j = 0; j < sband->n_bitrates; j++) {
 110                         if (sband->bitrates[j].flags & flag)
 111                                 params->basic_rates |= BIT(j);
 112                 }
 113         }
 114
 115         if (WARN_ON(wdev->connect_keys))
 116                 kfree(wdev->connect_keys);
 117         wdev->connect_keys = connkeys;
 118
 119         wdev->ibss_fixed = params->channel_fixed;
 120 #ifdef CONFIG_CFG80211_WEXT
 121         wdev->wext.ibss.chandef = params->chandef;
 122 #endif
 123         wdev->sme_state = CFG80211_SME_CONNECTING;
 124
 125         err = cfg80211_can_use_chan(rdev, wdev, params->chandef.chan,
 126                                     params->channel_fixed
 127                                     ? CHAN_MODE_SHARED
 128                                     : CHAN_MODE_EXCLUSIVE);
 129         if (err) {
 130                 wdev->connect_keys = NULL;
 131                 return err;
 132         }
 133
 134         err = rdev_join_ibss(rdev, dev, params);
 135         if (err) {
 136                 wdev->connect_keys = NULL;
 137                 wdev->sme_state = CFG80211_SME_IDLE;
 138                 return err;
 139         }
 140
 141         memcpy(wdev->ssid, params->ssid, params->ssid_len);
 142         wdev->ssid_len = params->ssid_len;
 143
 144         return 0;
 145 }
 146
 147 int cfg80211_join_ibss(struct cfg80211_registered_device *rdev,
 148                        struct net_device *dev,
 149                        struct cfg80211_ibss_params *params,
 150                        struct cfg80211_cached_keys *connkeys)
 151 {
 152         struct wireless_dev *wdev = dev->ieee80211_ptr;
 153         int err;
 154
 155         mutex_lock(&rdev->devlist_mtx);
 156         wdev_lock(wdev);
 157         err = __cfg80211_join_ibss(rdev, dev, params, connkeys);
 158         wdev_unlock(wdev);
 159         mutex_unlock(&rdev->devlist_mtx);
 160
 161         return err;
 162 }
 163
 164 static void __cfg80211_clear_ibss(struct net_device *dev, bool nowext)
 165 {
 166         struct wireless_dev *wdev = dev->ieee80211_ptr;
 167         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 168         int i;
 169
 170         ASSERT_WDEV_LOCK(wdev);
 171
 172         kfree(wdev->connect_keys);
 173         wdev->connect_keys = NULL;
 174
 175         /*
 176          * Delete all the keys ... pairwise keys can't really
 177          * exist any more anyway, but default keys might.
 178          */
 179         if (rdev->ops->del_key)
 180                 for (i = 0; i < 6; i++)
 181                         rdev_del_key(rdev, dev, i, false, NULL);
 182
 183         if (wdev->current_bss) {
 184                 cfg80211_unhold_bss(wdev->current_bss);
 185                 cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
 186         }
 187
 188         wdev->current_bss = NULL;
 189         wdev->sme_state = CFG80211_SME_IDLE;
 190         wdev->ssid_len = 0;
 191 #ifdef CONFIG_CFG80211_WEXT
 192         if (!nowext)
 193                 wdev->wext.ibss.ssid_len = 0;
 194 #endif
 195 }
 196
 197 void cfg80211_clear_ibss(struct net_device *dev, bool nowext)
 198 {
 199         struct wireless_dev *wdev = dev->ieee80211_ptr;
 200
 201         wdev_lock(wdev);
 202         __cfg80211_clear_ibss(dev, nowext);
 203         wdev_unlock(wdev);
 204 }
 205
 206 int __cfg80211_leave_ibss(struct cfg80211_registered_device *rdev,
 207                           struct net_device *dev, bool nowext)
 208 {
 209         struct wireless_dev *wdev = dev->ieee80211_ptr;
 210         int err;
 211
 212         ASSERT_WDEV_LOCK(wdev);
 213
 214         if (!wdev->ssid_len)
 215                 return -ENOLINK;
 216
 217         err = rdev_leave_ibss(rdev, dev);
 218
 219         if (err)
 220                 return err;
 221
 222         __cfg80211_clear_ibss(dev, nowext);
 223
 224         return 0;
 225 }
 226
 227 int cfg80211_leave_ibss(struct cfg80211_registered_device *rdev,
 228                         struct net_device *dev, bool nowext)
 229 {
 230         struct wireless_dev *wdev = dev->ieee80211_ptr;
 231         int err;
 232
 233         wdev_lock(wdev);
 234         err = __cfg80211_leave_ibss(rdev, dev, nowext);
 235         wdev_unlock(wdev);
 236
 237         return err;
 238 }
 239
 240 #ifdef CONFIG_CFG80211_WEXT
 241 int cfg80211_ibss_wext_join(struct cfg80211_registered_device *rdev,
 242                             struct wireless_dev *wdev)
 243 {
 244         struct cfg80211_cached_keys *ck = NULL;
 245         enum ieee80211_band band;
 246         int i, err;
 247
 248         ASSERT_WDEV_LOCK(wdev);
 249
 250         if (!wdev->wext.ibss.beacon_interval)
 251                 wdev->wext.ibss.beacon_interval = 100;
 252
 253         /* try to find an IBSS channel if none requested ... */
 254         if (!wdev->wext.ibss.chandef.chan) {
 255                 wdev->wext.ibss.chandef.width = NL80211_CHAN_WIDTH_20_NOHT;
 256
 257                 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 258                         struct ieee80211_supported_band *sband;
 259                         struct ieee80211_channel *chan;
 260
 261                         sband = rdev->wiphy.bands[band];
 262                         if (!sband)
 263                                 continue;
 264
 265                         for (i = 0; i < sband->n_channels; i++) {
 266                                 chan = &sband->channels[i];
 267                                 if (chan->flags & IEEE80211_CHAN_NO_IBSS)
 268                                         continue;
 269                                 if (chan->flags & IEEE80211_CHAN_DISABLED)
 270                                         continue;
 271                                 wdev->wext.ibss.chandef.chan = chan;
 272                                 wdev->wext.ibss.chandef.center_freq1 =
 273                                         chan->center_freq;
 274                                 break;
 275                         }
 276
 277                         if (wdev->wext.ibss.chandef.chan)
 278                                 break;
 279                 }
 280
 281                 if (!wdev->wext.ibss.chandef.chan)
 282                         return -EINVAL;
 283         }
 284
 285         /* don't join -- SSID is not there */
 286         if (!wdev->wext.ibss.ssid_len)
 287                 return 0;
 288
 289         if (!netif_running(wdev->netdev))
 290                 return 0;
 291
 292         if (wdev->wext.keys) {
 293                 wdev->wext.keys->def = wdev->wext.default_key;
 294                 wdev->wext.keys->defmgmt = wdev->wext.default_mgmt_key;
 295         }
 296
 297         wdev->wext.ibss.privacy = wdev->wext.default_key != -1;
 298
 299         if (wdev->wext.keys) {
 300                 ck = kmemdup(wdev->wext.keys, sizeof(*ck), GFP_KERNEL);
 301                 if (!ck)
 302                         return -ENOMEM;
 303                 for (i = 0; i < 6; i++)
 304                         ck->params[i].key = ck->data[i];
 305         }
 306         err = __cfg80211_join_ibss(rdev, wdev->netdev,
 307                                    &wdev->wext.ibss, ck);
 308         if (err)
 309                 kfree(ck);
 310
 311         return err;
 312 }
 313
 314 int cfg80211_ibss_wext_siwfreq(struct net_device *dev,
 315                                struct iw_request_info *info,
 316                                struct iw_freq *wextfreq, char *extra)
 317 {
 318         struct wireless_dev *wdev = dev->ieee80211_ptr;
 319         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 320         struct ieee80211_channel *chan = NULL;
 321         int err, freq;
 322
 323         /* call only for ibss! */
 324         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
 325                 return -EINVAL;
 326
 327         if (!rdev->ops->join_ibss)
 328                 return -EOPNOTSUPP;
 329
 330         freq = cfg80211_wext_freq(wdev->wiphy, wextfreq);
 331         if (freq < 0)
 332                 return freq;
 333
 334         if (freq) {
 335                 chan = ieee80211_get_channel(wdev->wiphy, freq);
 336                 if (!chan)
 337                         return -EINVAL;
 338                 if (chan->flags & IEEE80211_CHAN_NO_IBSS ||
 339                     chan->flags & IEEE80211_CHAN_DISABLED)
 340                         return -EINVAL;
 341         }
 342
 343         if (wdev->wext.ibss.chandef.chan == chan)
 344                 return 0;
 345
 346         wdev_lock(wdev);
 347         err = 0;
 348         if (wdev->ssid_len)
 349                 err = __cfg80211_leave_ibss(rdev, dev, true);
 350         wdev_unlock(wdev);
 351
 352         if (err)
 353                 return err;
 354
 355         if (chan) {
 356                 wdev->wext.ibss.chandef.chan = chan;
 357                 wdev->wext.ibss.chandef.width = NL80211_CHAN_WIDTH_20_NOHT;
 358                 wdev->wext.ibss.chandef.center_freq1 = freq;
 359                 wdev->wext.ibss.channel_fixed = true;
 360         } else {
 361                 /* cfg80211_ibss_wext_join will pick one if needed */
 362                 wdev->wext.ibss.channel_fixed = false;
 363         }
 364
 365         mutex_lock(&rdev->devlist_mtx);
 366         wdev_lock(wdev);
 367         err = cfg80211_ibss_wext_join(rdev, wdev);
 368         wdev_unlock(wdev);
 369         mutex_unlock(&rdev->devlist_mtx);
 370
 371         return err;
 372 }
 373
 374 int cfg80211_ibss_wext_giwfreq(struct net_device *dev,
 375                                struct iw_request_info *info,
 376                                struct iw_freq *freq, char *extra)
 377 {
 378         struct wireless_dev *wdev = dev->ieee80211_ptr;
 379         struct ieee80211_channel *chan = NULL;
 380
 381         /* call only for ibss! */
 382         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
 383                 return -EINVAL;
 384
 385         wdev_lock(wdev);
 386         if (wdev->current_bss)
 387                 chan = wdev->current_bss->pub.channel;
 388         else if (wdev->wext.ibss.chandef.chan)
 389                 chan = wdev->wext.ibss.chandef.chan;
 390         wdev_unlock(wdev);
 391
 392         if (chan) {
 393                 freq->m = chan->center_freq;
 394                 freq->e = 6;
 395                 return 0;
 396         }
 397
 398         /* no channel if not joining */
 399         return -EINVAL;
 400 }
 401
 402 int cfg80211_ibss_wext_siwessid(struct net_device *dev,
 403                                 struct iw_request_info *info,
 404                                 struct iw_point *data, char *ssid)
 405 {
 406         struct wireless_dev *wdev = dev->ieee80211_ptr;
 407         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 408         size_t len = data->length;
 409         int err;
 410
 411         /* call only for ibss! */
 412         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
 413                 return -EINVAL;
 414
 415         if (!rdev->ops->join_ibss)
 416                 return -EOPNOTSUPP;
 417
 418         wdev_lock(wdev);
 419         err = 0;
 420         if (wdev->ssid_len)
 421                 err = __cfg80211_leave_ibss(rdev, dev, true);
 422         wdev_unlock(wdev);
 423
 424         if (err)
 425                 return err;
 426
 427         /* iwconfig uses nul termination in SSID.. */
 428         if (len > 0 && ssid[len - 1] == '\0')
 429                 len--;
 430
 431         wdev->wext.ibss.ssid = wdev->ssid;
 432         memcpy(wdev->wext.ibss.ssid, ssid, len);
 433         wdev->wext.ibss.ssid_len = len;
 434
 435         mutex_lock(&rdev->devlist_mtx);
 436         wdev_lock(wdev);
 437         err = cfg80211_ibss_wext_join(rdev, wdev);
 438         wdev_unlock(wdev);
 439         mutex_unlock(&rdev->devlist_mtx);
 440
 441         return err;
 442 }
 443
 444 int cfg80211_ibss_wext_giwessid(struct net_device *dev,
 445                                 struct iw_request_info *info,
 446                                 struct iw_point *data, char *ssid)
 447 {
 448         struct wireless_dev *wdev = dev->ieee80211_ptr;
 449
 450         /* call only for ibss! */
 451         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
 452                 return -EINVAL;
 453
 454         data->flags = 0;
 455
 456         wdev_lock(wdev);
 457         if (wdev->ssid_len) {
 458                 data->flags = 1;
 459                 data->length = wdev->ssid_len;
 460                 memcpy(ssid, wdev->ssid, data->length);
 461         } else if (wdev->wext.ibss.ssid && wdev->wext.ibss.ssid_len) {
 462                 data->flags = 1;
 463                 data->length = wdev->wext.ibss.ssid_len;
 464                 memcpy(ssid, wdev->wext.ibss.ssid, data->length);
 465         }
 466         wdev_unlock(wdev);
 467
 468         return 0;
 469 }
 470
 471 int cfg80211_ibss_wext_siwap(struct net_device *dev,
 472                              struct iw_request_info *info,
 473                              struct sockaddr *ap_addr, char *extra)
 474 {
 475         struct wireless_dev *wdev = dev->ieee80211_ptr;
 476         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 477         u8 *bssid = ap_addr->sa_data;
 478         int err;
 479
 480         /* call only for ibss! */
 481         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
 482                 return -EINVAL;
 483
 484         if (!rdev->ops->join_ibss)
 485                 return -EOPNOTSUPP;
 486
 487         if (ap_addr->sa_family != ARPHRD_ETHER)
 488                 return -EINVAL;
 489
 490         /* automatic mode */
 491         if (is_zero_ether_addr(bssid) || is_broadcast_ether_addr(bssid))
 492                 bssid = NULL;
 493
 494         /* both automatic */
 495         if (!bssid && !wdev->wext.ibss.bssid)
 496                 return 0;
 497
 498         /* fixed already - and no change */
 499         if (wdev->wext.ibss.bssid && bssid &&
 500             ether_addr_equal(bssid, wdev->wext.ibss.bssid))
 501                 return 0;
 502
 503         wdev_lock(wdev);
 504         err = 0;
 505         if (wdev->ssid_len)
 506                 err = __cfg80211_leave_ibss(rdev, dev, true);
 507         wdev_unlock(wdev);
 508
 509         if (err)
 510                 return err;
 511
 512         if (bssid) {
 513                 memcpy(wdev->wext.bssid, bssid, ETH_ALEN);
 514                 wdev->wext.ibss.bssid = wdev->wext.bssid;
 515         } else
 516                 wdev->wext.ibss.bssid = NULL;
 517
 518         mutex_lock(&rdev->devlist_mtx);
 519         wdev_lock(wdev);
 520         err = cfg80211_ibss_wext_join(rdev, wdev);
 521         wdev_unlock(wdev);
 522         mutex_unlock(&rdev->devlist_mtx);
 523
 524         return err;
 525 }
 526
 527 int cfg80211_ibss_wext_giwap(struct net_device *dev,
 528                              struct iw_request_info *info,
 529                              struct sockaddr *ap_addr, char *extra)
 530 {
 531         struct wireless_dev *wdev = dev->ieee80211_ptr;
 532
 533         /* call only for ibss! */
 534         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
 535                 return -EINVAL;
 536
 537         ap_addr->sa_family = ARPHRD_ETHER;
 538
 539         wdev_lock(wdev);
 540         if (wdev->current_bss)
 541                 memcpy(ap_addr->sa_data, wdev->current_bss->pub.bssid, ETH_ALEN);
 542         else if (wdev->wext.ibss.bssid)
 543                 memcpy(ap_addr->sa_data, wdev->wext.ibss.bssid, ETH_ALEN);
 544         else
 545                 memset(ap_addr->sa_data, 0, ETH_ALEN);
 546
 547         wdev_unlock(wdev);
 548
 549         return 0;
 550 }
 551 #endif