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         cfg80211_sched_dfs_chan_update(rdev);
 194 }
 195
 196 void cfg80211_clear_ibss(struct net_device *dev, bool nowext)
 197 {
 198         struct wireless_dev *wdev = dev->ieee80211_ptr;
 199
 200         wdev_lock(wdev);
 201         __cfg80211_clear_ibss(dev, nowext);
 202         wdev_unlock(wdev);
 203 }
 204
 205 int __cfg80211_leave_ibss(struct cfg80211_registered_device *rdev,
 206                           struct net_device *dev, bool nowext)
 207 {
 208         struct wireless_dev *wdev = dev->ieee80211_ptr;
 209         int err;
 210
 211         ASSERT_WDEV_LOCK(wdev);
 212
 213         if (!wdev->ssid_len)
 214                 return -ENOLINK;
 215
 216         err = rdev_leave_ibss(rdev, dev);
 217
 218         if (err)
 219                 return err;
 220
 221         __cfg80211_clear_ibss(dev, nowext);
 222
 223         return 0;
 224 }
 225
 226 int cfg80211_leave_ibss(struct cfg80211_registered_device *rdev,
 227                         struct net_device *dev, bool nowext)
 228 {
 229         struct wireless_dev *wdev = dev->ieee80211_ptr;
 230         int err;
 231
 232         wdev_lock(wdev);
 233         err = __cfg80211_leave_ibss(rdev, dev, nowext);
 234         wdev_unlock(wdev);
 235
 236         return err;
 237 }
 238
 239 #ifdef CONFIG_CFG80211_WEXT
 240 int cfg80211_ibss_wext_join(struct cfg80211_registered_device *rdev,
 241                             struct wireless_dev *wdev)
 242 {
 243         struct cfg80211_cached_keys *ck = NULL;
 244         enum nl80211_band band;
 245         int i, err;
 246
 247         ASSERT_WDEV_LOCK(wdev);
 248
 249         if (!wdev->wext.ibss.beacon_interval)
 250                 wdev->wext.ibss.beacon_interval = 100;
 251
 252         /* try to find an IBSS channel if none requested ... */
 253         if (!wdev->wext.ibss.chandef.chan) {
 254                 struct ieee80211_channel *new_chan = NULL;
 255
 256                 for (band = 0; band < NUM_NL80211_BANDS; band++) {
 257                         struct ieee80211_supported_band *sband;
 258                         struct ieee80211_channel *chan;
 259
 260                         sband = rdev->wiphy.bands[band];
 261                         if (!sband)
 262                                 continue;
 263
 264                         for (i = 0; i < sband->n_channels; i++) {
 265                                 chan = &sband->channels[i];
 266                                 if (chan->flags & IEEE80211_CHAN_NO_IR)
 267                                         continue;
 268                                 if (chan->flags & IEEE80211_CHAN_DISABLED)
 269                                         continue;
 270                                 new_chan = chan;
 271                                 break;
 272                         }
 273
 274                         if (new_chan)
 275                                 break;
 276                 }
 277
 278                 if (!new_chan)
 279                         return -EINVAL;
 280
 281                 cfg80211_chandef_create(&wdev->wext.ibss.chandef, new_chan,
 282                                         NL80211_CHAN_NO_HT);
 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
 295         wdev->wext.ibss.privacy = wdev->wext.default_key != -1;
 296
 297         if (wdev->wext.keys && wdev->wext.keys->def != -1) {
 298                 ck = kmemdup(wdev->wext.keys, sizeof(*ck), GFP_KERNEL);
 299                 if (!ck)
 300                         return -ENOMEM;
 301                 for (i = 0; i < CFG80211_MAX_WEP_KEYS; i++)
 302                         ck->params[i].key = ck->data[i];
 303         }
 304         err = __cfg80211_join_ibss(rdev, wdev->netdev,
 305                                    &wdev->wext.ibss, ck);
 306         if (err)
 307                 kfree(ck);
 308
 309         return err;
 310 }
 311
 312 int cfg80211_ibss_wext_siwfreq(struct net_device *dev,
 313                                struct iw_request_info *info,
 314                                struct iw_freq *wextfreq, char *extra)
 315 {
 316         struct wireless_dev *wdev = dev->ieee80211_ptr;
 317         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 318         struct ieee80211_channel *chan = NULL;
 319         int err, freq;
 320
 321         /* call only for ibss! */
 322         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
 323                 return -EINVAL;
 324
 325         if (!rdev->ops->join_ibss)
 326                 return -EOPNOTSUPP;
 327
 328         freq = cfg80211_wext_freq(wextfreq);
 329         if (freq < 0)
 330                 return freq;
 331
 332         if (freq) {
 333                 chan = ieee80211_get_channel(wdev->wiphy, freq);
 334                 if (!chan)
 335                         return -EINVAL;
 336                 if (chan->flags & IEEE80211_CHAN_NO_IR ||
 337                     chan->flags & IEEE80211_CHAN_DISABLED)
 338                         return -EINVAL;
 339         }
 340
 341         if (wdev->wext.ibss.chandef.chan == chan)
 342                 return 0;
 343
 344         wdev_lock(wdev);
 345         err = 0;
 346         if (wdev->ssid_len)
 347                 err = __cfg80211_leave_ibss(rdev, dev, true);
 348         wdev_unlock(wdev);
 349
 350         if (err)
 351                 return err;
 352
 353         if (chan) {
 354                 cfg80211_chandef_create(&wdev->wext.ibss.chandef, chan,
 355                                         NL80211_CHAN_NO_HT);
 356                 wdev->wext.ibss.channel_fixed = true;
 357         } else {
 358                 /* cfg80211_ibss_wext_join will pick one if needed */
 359                 wdev->wext.ibss.channel_fixed = false;
 360         }
 361
 362         wdev_lock(wdev);
 363         err = cfg80211_ibss_wext_join(rdev, wdev);
 364         wdev_unlock(wdev);
 365
 366         return err;
 367 }
 368
 369 int cfg80211_ibss_wext_giwfreq(struct net_device *dev,
 370                                struct iw_request_info *info,
 371                                struct iw_freq *freq, char *extra)
 372 {
 373         struct wireless_dev *wdev = dev->ieee80211_ptr;
 374         struct ieee80211_channel *chan = NULL;
 375
 376         /* call only for ibss! */
 377         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
 378                 return -EINVAL;
 379
 380         wdev_lock(wdev);
 381         if (wdev->current_bss)
 382                 chan = wdev->current_bss->pub.channel;
 383         else if (wdev->wext.ibss.chandef.chan)
 384                 chan = wdev->wext.ibss.chandef.chan;
 385         wdev_unlock(wdev);
 386
 387         if (chan) {
 388                 freq->m = chan->center_freq;
 389                 freq->e = 6;
 390                 return 0;
 391         }
 392
 393         /* no channel if not joining */
 394         return -EINVAL;
 395 }
 396
 397 int cfg80211_ibss_wext_siwessid(struct net_device *dev,
 398                                 struct iw_request_info *info,
 399                                 struct iw_point *data, char *ssid)
 400 {
 401         struct wireless_dev *wdev = dev->ieee80211_ptr;
 402         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 403         size_t len = data->length;
 404         int err;
 405
 406         /* call only for ibss! */
 407         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
 408                 return -EINVAL;
 409
 410         if (!rdev->ops->join_ibss)
 411                 return -EOPNOTSUPP;
 412
 413         wdev_lock(wdev);
 414         err = 0;
 415         if (wdev->ssid_len)
 416                 err = __cfg80211_leave_ibss(rdev, dev, true);
 417         wdev_unlock(wdev);
 418
 419         if (err)
 420                 return err;
 421
 422         /* iwconfig uses nul termination in SSID.. */
 423         if (len > 0 && ssid[len - 1] == '\0')
 424                 len--;
 425
 426         memcpy(wdev->ssid, ssid, len);
 427         wdev->wext.ibss.ssid = wdev->ssid;
 428         wdev->wext.ibss.ssid_len = len;
 429
 430         wdev_lock(wdev);
 431         err = cfg80211_ibss_wext_join(rdev, wdev);
 432         wdev_unlock(wdev);
 433
 434         return err;
 435 }
 436
 437 int cfg80211_ibss_wext_giwessid(struct net_device *dev,
 438                                 struct iw_request_info *info,
 439                                 struct iw_point *data, char *ssid)
 440 {
 441         struct wireless_dev *wdev = dev->ieee80211_ptr;
 442
 443         /* call only for ibss! */
 444         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
 445                 return -EINVAL;
 446
 447         data->flags = 0;
 448
 449         wdev_lock(wdev);
 450         if (wdev->ssid_len) {
 451                 data->flags = 1;
 452                 data->length = wdev->ssid_len;
 453                 memcpy(ssid, wdev->ssid, data->length);
 454         } else if (wdev->wext.ibss.ssid && wdev->wext.ibss.ssid_len) {
 455                 data->flags = 1;
 456                 data->length = wdev->wext.ibss.ssid_len;
 457                 memcpy(ssid, wdev->wext.ibss.ssid, data->length);
 458         }
 459         wdev_unlock(wdev);
 460
 461         return 0;
 462 }
 463
 464 int cfg80211_ibss_wext_siwap(struct net_device *dev,
 465                              struct iw_request_info *info,
 466                              struct sockaddr *ap_addr, char *extra)
 467 {
 468         struct wireless_dev *wdev = dev->ieee80211_ptr;
 469         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 470         u8 *bssid = ap_addr->sa_data;
 471         int err;
 472
 473         /* call only for ibss! */
 474         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
 475                 return -EINVAL;
 476
 477         if (!rdev->ops->join_ibss)
 478                 return -EOPNOTSUPP;
 479
 480         if (ap_addr->sa_family != ARPHRD_ETHER)
 481                 return -EINVAL;
 482
 483         /* automatic mode */
 484         if (is_zero_ether_addr(bssid) || is_broadcast_ether_addr(bssid))
 485                 bssid = NULL;
 486
 487         if (bssid && !is_valid_ether_addr(bssid))
 488                 return -EINVAL;
 489
 490         /* both automatic */
 491         if (!bssid && !wdev->wext.ibss.bssid)
 492                 return 0;
 493
 494         /* fixed already - and no change */
 495         if (wdev->wext.ibss.bssid && bssid &&
 496             ether_addr_equal(bssid, wdev->wext.ibss.bssid))
 497                 return 0;
 498
 499         wdev_lock(wdev);
 500         err = 0;
 501         if (wdev->ssid_len)
 502                 err = __cfg80211_leave_ibss(rdev, dev, true);
 503         wdev_unlock(wdev);
 504
 505         if (err)
 506                 return err;
 507
 508         if (bssid) {
 509                 memcpy(wdev->wext.bssid, bssid, ETH_ALEN);
 510                 wdev->wext.ibss.bssid = wdev->wext.bssid;
 511         } else
 512                 wdev->wext.ibss.bssid = NULL;
 513
 514         wdev_lock(wdev);
 515         err = cfg80211_ibss_wext_join(rdev, wdev);
 516         wdev_unlock(wdev);
 517
 518         return err;
 519 }
 520
 521 int cfg80211_ibss_wext_giwap(struct net_device *dev,
 522                              struct iw_request_info *info,
 523                              struct sockaddr *ap_addr, char *extra)
 524 {
 525         struct wireless_dev *wdev = dev->ieee80211_ptr;
 526
 527         /* call only for ibss! */
 528         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
 529                 return -EINVAL;
 530
 531         ap_addr->sa_family = ARPHRD_ETHER;
 532
 533         wdev_lock(wdev);
 534         if (wdev->current_bss)
 535                 memcpy(ap_addr->sa_data, wdev->current_bss->pub.bssid, ETH_ALEN);
 536         else if (wdev->wext.ibss.bssid)
 537                 memcpy(ap_addr->sa_data, wdev->wext.ibss.bssid, ETH_ALEN);
 538         else
 539                 eth_zero_addr(ap_addr->sa_data);
 540
 541         wdev_unlock(wdev);
 542
 543         return 0;
 544 }
 545 #endif