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                                 break;
 267                         }
 268
 269                         if (wdev->wext.ibss.chandef.chan)
 270                                 break;
 271                 }
 272
 273                 if (!wdev->wext.ibss.chandef.chan)
 274                         return -EINVAL;
 275         }
 276
 277         /* don't join -- SSID is not there */
 278         if (!wdev->wext.ibss.ssid_len)
 279                 return 0;
 280
 281         if (!netif_running(wdev->netdev))
 282                 return 0;
 283
 284         if (wdev->wext.keys) {
 285                 wdev->wext.keys->def = wdev->wext.default_key;
 286                 wdev->wext.keys->defmgmt = wdev->wext.default_mgmt_key;
 287         }
 288
 289         wdev->wext.ibss.privacy = wdev->wext.default_key != -1;
 290
 291         if (wdev->wext.keys) {
 292                 ck = kmemdup(wdev->wext.keys, sizeof(*ck), GFP_KERNEL);
 293                 if (!ck)
 294                         return -ENOMEM;
 295                 for (i = 0; i < 6; i++)
 296                         ck->params[i].key = ck->data[i];
 297         }
 298         err = __cfg80211_join_ibss(rdev, wdev->netdev,
 299                                    &wdev->wext.ibss, ck);
 300         if (err)
 301                 kfree(ck);
 302
 303         return err;
 304 }
 305
 306 int cfg80211_ibss_wext_siwfreq(struct net_device *dev,
 307                                struct iw_request_info *info,
 308                                struct iw_freq *wextfreq, char *extra)
 309 {
 310         struct wireless_dev *wdev = dev->ieee80211_ptr;
 311         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 312         struct ieee80211_channel *chan = NULL;
 313         int err, freq;
 314
 315         /* call only for ibss! */
 316         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
 317                 return -EINVAL;
 318
 319         if (!rdev->ops->join_ibss)
 320                 return -EOPNOTSUPP;
 321
 322         freq = cfg80211_wext_freq(wdev->wiphy, wextfreq);
 323         if (freq < 0)
 324                 return freq;
 325
 326         if (freq) {
 327                 chan = ieee80211_get_channel(wdev->wiphy, freq);
 328                 if (!chan)
 329                         return -EINVAL;
 330                 if (chan->flags & IEEE80211_CHAN_NO_IBSS ||
 331                     chan->flags & IEEE80211_CHAN_DISABLED)
 332                         return -EINVAL;
 333         }
 334
 335         if (wdev->wext.ibss.chandef.chan == chan)
 336                 return 0;
 337
 338         wdev_lock(wdev);
 339         err = 0;
 340         if (wdev->ssid_len)
 341                 err = __cfg80211_leave_ibss(rdev, dev, true);
 342         wdev_unlock(wdev);
 343
 344         if (err)
 345                 return err;
 346
 347         if (chan) {
 348                 wdev->wext.ibss.chandef.chan = chan;
 349                 wdev->wext.ibss.chandef.width = NL80211_CHAN_WIDTH_20_NOHT;
 350                 wdev->wext.ibss.channel_fixed = true;
 351         } else {
 352                 /* cfg80211_ibss_wext_join will pick one if needed */
 353                 wdev->wext.ibss.channel_fixed = false;
 354         }
 355
 356         wdev_lock(wdev);
 357         err = cfg80211_ibss_wext_join(rdev, wdev);
 358         wdev_unlock(wdev);
 359
 360         return err;
 361 }
 362
 363 int cfg80211_ibss_wext_giwfreq(struct net_device *dev,
 364                                struct iw_request_info *info,
 365                                struct iw_freq *freq, char *extra)
 366 {
 367         struct wireless_dev *wdev = dev->ieee80211_ptr;
 368         struct ieee80211_channel *chan = NULL;
 369
 370         /* call only for ibss! */
 371         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
 372                 return -EINVAL;
 373
 374         wdev_lock(wdev);
 375         if (wdev->current_bss)
 376                 chan = wdev->current_bss->pub.channel;
 377         else if (wdev->wext.ibss.chandef.chan)
 378                 chan = wdev->wext.ibss.chandef.chan;
 379         wdev_unlock(wdev);
 380
 381         if (chan) {
 382                 freq->m = chan->center_freq;
 383                 freq->e = 6;
 384                 return 0;
 385         }
 386
 387         /* no channel if not joining */
 388         return -EINVAL;
 389 }
 390
 391 int cfg80211_ibss_wext_siwessid(struct net_device *dev,
 392                                 struct iw_request_info *info,
 393                                 struct iw_point *data, char *ssid)
 394 {
 395         struct wireless_dev *wdev = dev->ieee80211_ptr;
 396         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 397         size_t len = data->length;
 398         int err;
 399
 400         /* call only for ibss! */
 401         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
 402                 return -EINVAL;
 403
 404         if (!rdev->ops->join_ibss)
 405                 return -EOPNOTSUPP;
 406
 407         wdev_lock(wdev);
 408         err = 0;
 409         if (wdev->ssid_len)
 410                 err = __cfg80211_leave_ibss(rdev, dev, true);
 411         wdev_unlock(wdev);
 412
 413         if (err)
 414                 return err;
 415
 416         /* iwconfig uses nul termination in SSID.. */
 417         if (len > 0 && ssid[len - 1] == '\0')
 418                 len--;
 419
 420         wdev->wext.ibss.ssid = wdev->ssid;
 421         memcpy(wdev->wext.ibss.ssid, ssid, len);
 422         wdev->wext.ibss.ssid_len = len;
 423
 424         wdev_lock(wdev);
 425         err = cfg80211_ibss_wext_join(rdev, wdev);
 426         wdev_unlock(wdev);
 427
 428         return err;
 429 }
 430
 431 int cfg80211_ibss_wext_giwessid(struct net_device *dev,
 432                                 struct iw_request_info *info,
 433                                 struct iw_point *data, char *ssid)
 434 {
 435         struct wireless_dev *wdev = dev->ieee80211_ptr;
 436
 437         /* call only for ibss! */
 438         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
 439                 return -EINVAL;
 440
 441         data->flags = 0;
 442
 443         wdev_lock(wdev);
 444         if (wdev->ssid_len) {
 445                 data->flags = 1;
 446                 data->length = wdev->ssid_len;
 447                 memcpy(ssid, wdev->ssid, data->length);
 448         } else if (wdev->wext.ibss.ssid && wdev->wext.ibss.ssid_len) {
 449                 data->flags = 1;
 450                 data->length = wdev->wext.ibss.ssid_len;
 451                 memcpy(ssid, wdev->wext.ibss.ssid, data->length);
 452         }
 453         wdev_unlock(wdev);
 454
 455         return 0;
 456 }
 457
 458 int cfg80211_ibss_wext_siwap(struct net_device *dev,
 459                              struct iw_request_info *info,
 460                              struct sockaddr *ap_addr, char *extra)
 461 {
 462         struct wireless_dev *wdev = dev->ieee80211_ptr;
 463         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 464         u8 *bssid = ap_addr->sa_data;
 465         int err;
 466
 467         /* call only for ibss! */
 468         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
 469                 return -EINVAL;
 470
 471         if (!rdev->ops->join_ibss)
 472                 return -EOPNOTSUPP;
 473
 474         if (ap_addr->sa_family != ARPHRD_ETHER)
 475                 return -EINVAL;
 476
 477         /* automatic mode */
 478         if (is_zero_ether_addr(bssid) || is_broadcast_ether_addr(bssid))
 479                 bssid = NULL;
 480
 481         /* both automatic */
 482         if (!bssid && !wdev->wext.ibss.bssid)
 483                 return 0;
 484
 485         /* fixed already - and no change */
 486         if (wdev->wext.ibss.bssid && bssid &&
 487             ether_addr_equal(bssid, wdev->wext.ibss.bssid))
 488                 return 0;
 489
 490         wdev_lock(wdev);
 491         err = 0;
 492         if (wdev->ssid_len)
 493                 err = __cfg80211_leave_ibss(rdev, dev, true);
 494         wdev_unlock(wdev);
 495
 496         if (err)
 497                 return err;
 498
 499         if (bssid) {
 500                 memcpy(wdev->wext.bssid, bssid, ETH_ALEN);
 501                 wdev->wext.ibss.bssid = wdev->wext.bssid;
 502         } else
 503                 wdev->wext.ibss.bssid = NULL;
 504
 505         wdev_lock(wdev);
 506         err = cfg80211_ibss_wext_join(rdev, wdev);
 507         wdev_unlock(wdev);
 508
 509         return err;
 510 }
 511
 512 int cfg80211_ibss_wext_giwap(struct net_device *dev,
 513                              struct iw_request_info *info,
 514                              struct sockaddr *ap_addr, char *extra)
 515 {
 516         struct wireless_dev *wdev = dev->ieee80211_ptr;
 517
 518         /* call only for ibss! */
 519         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
 520                 return -EINVAL;
 521
 522         ap_addr->sa_family = ARPHRD_ETHER;
 523
 524         wdev_lock(wdev);
 525         if (wdev->current_bss)
 526                 memcpy(ap_addr->sa_data, wdev->current_bss->pub.bssid, ETH_ALEN);
 527         else if (wdev->wext.ibss.bssid)
 528                 memcpy(ap_addr->sa_data, wdev->wext.ibss.bssid, ETH_ALEN);
 529         else
 530                 memset(ap_addr->sa_data, 0, ETH_ALEN);
 531
 532         wdev_unlock(wdev);
 533
 534         return 0;
 535 }
 536 #endif