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                             struct ieee80211_channel *channel)
  19 {
  20         struct wireless_dev *wdev = dev->ieee80211_ptr;
  21         struct cfg80211_bss *bss;
  22 #ifdef CONFIG_CFG80211_WEXT
  23         union iwreq_data wrqu;
  24 #endif
  25
  26         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
  27                 return;
  28
  29         if (!wdev->ssid_len)
  30                 return;
  31
  32         bss = cfg80211_get_bss(wdev->wiphy, channel, bssid, NULL, 0,
  33                                IEEE80211_BSS_TYPE_IBSS, IEEE80211_PRIVACY_ANY);
  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         if (!(wdev->wiphy->flags & WIPHY_FLAG_HAS_STATIC_WEP))
  47                 cfg80211_upload_connect_keys(wdev);
  48
  49         nl80211_send_ibss_bssid(wiphy_to_rdev(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,
  59                           struct ieee80211_channel *channel, gfp_t gfp)
  60 {
  61         struct wireless_dev *wdev = dev->ieee80211_ptr;
  62         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
  63         struct cfg80211_event *ev;
  64         unsigned long flags;
  65
  66         trace_cfg80211_ibss_joined(dev, bssid, channel);
  67
  68         if (WARN_ON(!channel))
  69                 return;
  70
  71         ev = kzalloc(sizeof(*ev), gfp);
  72         if (!ev)
  73                 return;
  74
  75         ev->type = EVENT_IBSS_JOINED;
  76         memcpy(ev->ij.bssid, bssid, ETH_ALEN);
  77         ev->ij.channel = channel;
  78
  79         spin_lock_irqsave(&wdev->event_lock, flags);
  80         list_add_tail(&ev->list, &wdev->event_list);
  81         spin_unlock_irqrestore(&wdev->event_lock, flags);
  82         queue_work(cfg80211_wq, &rdev->event_work);
  83 }
  84 EXPORT_SYMBOL(cfg80211_ibss_joined);
  85
  86 static int __cfg80211_join_ibss(struct cfg80211_registered_device *rdev,
  87                                 struct net_device *dev,
  88                                 struct cfg80211_ibss_params *params,
  89                                 struct cfg80211_cached_keys *connkeys)
  90 {
  91         struct wireless_dev *wdev = dev->ieee80211_ptr;
  92         int err;
  93
  94         ASSERT_WDEV_LOCK(wdev);
  95
  96         if (wdev->ssid_len)
  97                 return -EALREADY;
  98
  99         if (!params->basic_rates) {
 100                 /*
 101                 * If no rates were explicitly configured,
 102                 * use the mandatory rate set for 11b or
 103                 * 11a for maximum compatibility.
 104                 */
 105                 struct ieee80211_supported_band *sband =
 106                         rdev->wiphy.bands[params->chandef.chan->band];
 107                 int j;
 108                 u32 flag = params->chandef.chan->band == NL80211_BAND_5GHZ ?
 109                         IEEE80211_RATE_MANDATORY_A :
 110                         IEEE80211_RATE_MANDATORY_B;
 111
 112                 for (j = 0; j < sband->n_bitrates; j++) {
 113                         if (sband->bitrates[j].flags & flag)
 114                                 params->basic_rates |= BIT(j);
 115                 }
 116         }
 117
 118         if (WARN_ON(connkeys && connkeys->def < 0))
 119                 return -EINVAL;
 120
 121         if (WARN_ON(wdev->connect_keys))
 122                 kzfree(wdev->connect_keys);
 123         wdev->connect_keys = connkeys;
 124
 125         wdev->ibss_fixed = params->channel_fixed;
 126         wdev->ibss_dfs_possible = params->userspace_handles_dfs;
 127         wdev->chandef = params->chandef;
 128 #ifdef CONFIG_CFG80211_WEXT
 129         wdev->wext.ibss.chandef = params->chandef;
 130 #endif
 131         err = rdev_join_ibss(rdev, dev, params);
 132         if (err) {
 133                 wdev->connect_keys = NULL;
 134                 return err;
 135         }
 136
 137         memcpy(wdev->ssid, params->ssid, params->ssid_len);
 138         wdev->ssid_len = params->ssid_len;
 139
 140         return 0;
 141 }
 142
 143 int cfg80211_join_ibss(struct cfg80211_registered_device *rdev,
 144                        struct net_device *dev,
 145                        struct cfg80211_ibss_params *params,
 146                        struct cfg80211_cached_keys *connkeys)
 147 {
 148         struct wireless_dev *wdev = dev->ieee80211_ptr;
 149         int err;
 150
 151         ASSERT_RTNL();
 152
 153         wdev_lock(wdev);
 154         err = __cfg80211_join_ibss(rdev, dev, params, connkeys);
 155         wdev_unlock(wdev);
 156
 157         return err;
 158 }
 159
 160 static void __cfg80211_clear_ibss(struct net_device *dev, bool nowext)
 161 {
 162         struct wireless_dev *wdev = dev->ieee80211_ptr;
 163         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 164         int i;
 165
 166         ASSERT_WDEV_LOCK(wdev);
 167
 168         kzfree(wdev->connect_keys);
 169         wdev->connect_keys = NULL;
 170
 171         rdev_set_qos_map(rdev, dev, NULL);
 172
 173         /*
 174          * Delete all the keys ... pairwise keys can't really
 175          * exist any more anyway, but default keys might.
 176          */
 177         if (rdev->ops->del_key)
 178                 for (i = 0; i < 6; i++)
 179                         rdev_del_key(rdev, dev, i, false, NULL);
 180
 181         if (wdev->current_bss) {
 182                 cfg80211_unhold_bss(wdev->current_bss);
 183                 cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
 184         }
 185
 186         wdev->current_bss = NULL;
 187         wdev->ssid_len = 0;
 188         memset(&wdev->chandef, 0, sizeof(wdev->chandef));
 189 #ifdef CONFIG_CFG80211_WEXT
 190         if (!nowext)
 191                 wdev->wext.ibss.ssid_len = 0;
 192 #endif
 193 }
 194
 195 void cfg80211_clear_ibss(struct net_device *dev, bool nowext)
 196 {
 197         struct wireless_dev *wdev = dev->ieee80211_ptr;
 198
 199         wdev_lock(wdev);
 200         __cfg80211_clear_ibss(dev, nowext);
 201         wdev_unlock(wdev);
 202 }
 203
 204 int __cfg80211_leave_ibss(struct cfg80211_registered_device *rdev,
 205                           struct net_device *dev, bool nowext)
 206 {
 207         struct wireless_dev *wdev = dev->ieee80211_ptr;
 208         int err;
 209
 210         ASSERT_WDEV_LOCK(wdev);
 211
 212         if (!wdev->ssid_len)
 213                 return -ENOLINK;
 214
 215         err = rdev_leave_ibss(rdev, dev);
 216
 217         if (err)
 218                 return err;
 219
 220         __cfg80211_clear_ibss(dev, nowext);
 221
 222         return 0;
 223 }
 224
 225 int cfg80211_leave_ibss(struct cfg80211_registered_device *rdev,
 226                         struct net_device *dev, bool nowext)
 227 {
 228         struct wireless_dev *wdev = dev->ieee80211_ptr;
 229         int err;
 230
 231         wdev_lock(wdev);
 232         err = __cfg80211_leave_ibss(rdev, dev, nowext);
 233         wdev_unlock(wdev);
 234
 235         return err;
 236 }
 237
 238 #ifdef CONFIG_CFG80211_WEXT
 239 int cfg80211_ibss_wext_join(struct cfg80211_registered_device *rdev,
 240                             struct wireless_dev *wdev)
 241 {
 242         struct cfg80211_cached_keys *ck = NULL;
 243         enum nl80211_band band;
 244         int i, err;
 245
 246         ASSERT_WDEV_LOCK(wdev);
 247
 248         if (!wdev->wext.ibss.beacon_interval)
 249                 wdev->wext.ibss.beacon_interval = 100;
 250
 251         /* try to find an IBSS channel if none requested ... */
 252         if (!wdev->wext.ibss.chandef.chan) {
 253                 struct ieee80211_channel *new_chan = NULL;
 254
 255                 for (band = 0; band < NUM_NL80211_BANDS; band++) {
 256                         struct ieee80211_supported_band *sband;
 257                         struct ieee80211_channel *chan;
 258
 259                         sband = rdev->wiphy.bands[band];
 260                         if (!sband)
 261                                 continue;
 262
 263                         for (i = 0; i < sband->n_channels; i++) {
 264                                 chan = &sband->channels[i];
 265                                 if (chan->flags & IEEE80211_CHAN_NO_IR)
 266                                         continue;
 267                                 if (chan->flags & IEEE80211_CHAN_DISABLED)
 268                                         continue;
 269                                 new_chan = chan;
 270                                 break;
 271                         }
 272
 273                         if (new_chan)
 274                                 break;
 275                 }
 276
 277                 if (!new_chan)
 278                         return -EINVAL;
 279
 280                 cfg80211_chandef_create(&wdev->wext.ibss.chandef, new_chan,
 281                                         NL80211_CHAN_NO_HT);
 282         }
 283
 284         /* don't join -- SSID is not there */
 285         if (!wdev->wext.ibss.ssid_len)
 286                 return 0;
 287
 288         if (!netif_running(wdev->netdev))
 289                 return 0;
 290
 291         if (wdev->wext.keys)
 292                 wdev->wext.keys->def = wdev->wext.default_key;
 293
 294         wdev->wext.ibss.privacy = wdev->wext.default_key != -1;
 295
 296         if (wdev->wext.keys && wdev->wext.keys->def != -1) {
 297                 ck = kmemdup(wdev->wext.keys, sizeof(*ck), GFP_KERNEL);
 298                 if (!ck)
 299                         return -ENOMEM;
 300                 for (i = 0; i < CFG80211_MAX_WEP_KEYS; i++)
 301                         ck->params[i].key = ck->data[i];
 302         }
 303         err = __cfg80211_join_ibss(rdev, wdev->netdev,
 304                                    &wdev->wext.ibss, ck);
 305         if (err)
 306                 kfree(ck);
 307
 308         return err;
 309 }
 310
 311 int cfg80211_ibss_wext_siwfreq(struct net_device *dev,
 312                                struct iw_request_info *info,
 313                                struct iw_freq *wextfreq, char *extra)
 314 {
 315         struct wireless_dev *wdev = dev->ieee80211_ptr;
 316         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 317         struct ieee80211_channel *chan = NULL;
 318         int err, freq;
 319
 320         /* call only for ibss! */
 321         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
 322                 return -EINVAL;
 323
 324         if (!rdev->ops->join_ibss)
 325                 return -EOPNOTSUPP;
 326
 327         freq = cfg80211_wext_freq(wextfreq);
 328         if (freq < 0)
 329                 return freq;
 330
 331         if (freq) {
 332                 chan = ieee80211_get_channel(wdev->wiphy, freq);
 333                 if (!chan)
 334                         return -EINVAL;
 335                 if (chan->flags & IEEE80211_CHAN_NO_IR ||
 336                     chan->flags & IEEE80211_CHAN_DISABLED)
 337                         return -EINVAL;
 338         }
 339
 340         if (wdev->wext.ibss.chandef.chan == chan)
 341                 return 0;
 342
 343         wdev_lock(wdev);
 344         err = 0;
 345         if (wdev->ssid_len)
 346                 err = __cfg80211_leave_ibss(rdev, dev, true);
 347         wdev_unlock(wdev);
 348
 349         if (err)
 350                 return err;
 351
 352         if (chan) {
 353                 cfg80211_chandef_create(&wdev->wext.ibss.chandef, chan,
 354                                         NL80211_CHAN_NO_HT);
 355                 wdev->wext.ibss.channel_fixed = true;
 356         } else {
 357                 /* cfg80211_ibss_wext_join will pick one if needed */
 358                 wdev->wext.ibss.channel_fixed = false;
 359         }
 360
 361         wdev_lock(wdev);
 362         err = cfg80211_ibss_wext_join(rdev, wdev);
 363         wdev_unlock(wdev);
 364
 365         return err;
 366 }
 367
 368 int cfg80211_ibss_wext_giwfreq(struct net_device *dev,
 369                                struct iw_request_info *info,
 370                                struct iw_freq *freq, char *extra)
 371 {
 372         struct wireless_dev *wdev = dev->ieee80211_ptr;
 373         struct ieee80211_channel *chan = NULL;
 374
 375         /* call only for ibss! */
 376         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
 377                 return -EINVAL;
 378
 379         wdev_lock(wdev);
 380         if (wdev->current_bss)
 381                 chan = wdev->current_bss->pub.channel;
 382         else if (wdev->wext.ibss.chandef.chan)
 383                 chan = wdev->wext.ibss.chandef.chan;
 384         wdev_unlock(wdev);
 385
 386         if (chan) {
 387                 freq->m = chan->center_freq;
 388                 freq->e = 6;
 389                 return 0;
 390         }
 391
 392         /* no channel if not joining */
 393         return -EINVAL;
 394 }
 395
 396 int cfg80211_ibss_wext_siwessid(struct net_device *dev,
 397                                 struct iw_request_info *info,
 398                                 struct iw_point *data, char *ssid)
 399 {
 400         struct wireless_dev *wdev = dev->ieee80211_ptr;
 401         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 402         size_t len = data->length;
 403         int err;
 404
 405         /* call only for ibss! */
 406         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
 407                 return -EINVAL;
 408
 409         if (!rdev->ops->join_ibss)
 410                 return -EOPNOTSUPP;
 411
 412         wdev_lock(wdev);
 413         err = 0;
 414         if (wdev->ssid_len)
 415                 err = __cfg80211_leave_ibss(rdev, dev, true);
 416         wdev_unlock(wdev);
 417
 418         if (err)
 419                 return err;
 420
 421         /* iwconfig uses nul termination in SSID.. */
 422         if (len > 0 && ssid[len - 1] == '\0')
 423                 len--;
 424
 425         memcpy(wdev->ssid, ssid, len);
 426         wdev->wext.ibss.ssid = wdev->ssid;
 427         wdev->wext.ibss.ssid_len = len;
 428
 429         wdev_lock(wdev);
 430         err = cfg80211_ibss_wext_join(rdev, wdev);
 431         wdev_unlock(wdev);
 432
 433         return err;
 434 }
 435
 436 int cfg80211_ibss_wext_giwessid(struct net_device *dev,
 437                                 struct iw_request_info *info,
 438                                 struct iw_point *data, char *ssid)
 439 {
 440         struct wireless_dev *wdev = dev->ieee80211_ptr;
 441
 442         /* call only for ibss! */
 443         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
 444                 return -EINVAL;
 445
 446         data->flags = 0;
 447
 448         wdev_lock(wdev);
 449         if (wdev->ssid_len) {
 450                 data->flags = 1;
 451                 data->length = wdev->ssid_len;
 452                 memcpy(ssid, wdev->ssid, data->length);
 453         } else if (wdev->wext.ibss.ssid && wdev->wext.ibss.ssid_len) {
 454                 data->flags = 1;
 455                 data->length = wdev->wext.ibss.ssid_len;
 456                 memcpy(ssid, wdev->wext.ibss.ssid, data->length);
 457         }
 458         wdev_unlock(wdev);
 459
 460         return 0;
 461 }
 462
 463 int cfg80211_ibss_wext_siwap(struct net_device *dev,
 464                              struct iw_request_info *info,
 465                              struct sockaddr *ap_addr, char *extra)
 466 {
 467         struct wireless_dev *wdev = dev->ieee80211_ptr;
 468         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 469         u8 *bssid = ap_addr->sa_data;
 470         int err;
 471
 472         /* call only for ibss! */
 473         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
 474                 return -EINVAL;
 475
 476         if (!rdev->ops->join_ibss)
 477                 return -EOPNOTSUPP;
 478
 479         if (ap_addr->sa_family != ARPHRD_ETHER)
 480                 return -EINVAL;
 481
 482         /* automatic mode */
 483         if (is_zero_ether_addr(bssid) || is_broadcast_ether_addr(bssid))
 484                 bssid = NULL;
 485
 486         if (bssid && !is_valid_ether_addr(bssid))
 487                 return -EINVAL;
 488
 489         /* both automatic */
 490         if (!bssid && !wdev->wext.ibss.bssid)
 491                 return 0;
 492
 493         /* fixed already - and no change */
 494         if (wdev->wext.ibss.bssid && bssid &&
 495             ether_addr_equal(bssid, wdev->wext.ibss.bssid))
 496                 return 0;
 497
 498         wdev_lock(wdev);
 499         err = 0;
 500         if (wdev->ssid_len)
 501                 err = __cfg80211_leave_ibss(rdev, dev, true);
 502         wdev_unlock(wdev);
 503
 504         if (err)
 505                 return err;
 506
 507         if (bssid) {
 508                 memcpy(wdev->wext.bssid, bssid, ETH_ALEN);
 509                 wdev->wext.ibss.bssid = wdev->wext.bssid;
 510         } else
 511                 wdev->wext.ibss.bssid = NULL;
 512
 513         wdev_lock(wdev);
 514         err = cfg80211_ibss_wext_join(rdev, wdev);
 515         wdev_unlock(wdev);
 516
 517         return err;
 518 }
 519
 520 int cfg80211_ibss_wext_giwap(struct net_device *dev,
 521                              struct iw_request_info *info,
 522                              struct sockaddr *ap_addr, char *extra)
 523 {
 524         struct wireless_dev *wdev = dev->ieee80211_ptr;
 525
 526         /* call only for ibss! */
 527         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
 528                 return -EINVAL;
 529
 530         ap_addr->sa_family = ARPHRD_ETHER;
 531
 532         wdev_lock(wdev);
 533         if (wdev->current_bss)
 534                 memcpy(ap_addr->sa_data, wdev->current_bss->pub.bssid, ETH_ALEN);
 535         else if (wdev->wext.ibss.bssid)
 536                 memcpy(ap_addr->sa_data, wdev->wext.ibss.bssid, ETH_ALEN);
 537         else
 538                 eth_zero_addr(ap_addr->sa_data);
 539
 540         wdev_unlock(wdev);
 541
 542         return 0;
 543 }
 544 #endif