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                                 break;
 273                         }
 274
 275                         if (wdev->wext.ibss.chandef.chan)
 276                                 break;
 277                 }
 278
 279                 if (!wdev->wext.ibss.chandef.chan)
 280                         return -EINVAL;
 281         }
 282
 283         /* don't join -- SSID is not there */
 284         if (!wdev->wext.ibss.ssid_len)
 285                 return 0;
 286
 287         if (!netif_running(wdev->netdev))
 288                 return 0;
 289
 290         if (wdev->wext.keys) {
 291                 wdev->wext.keys->def = wdev->wext.default_key;
 292                 wdev->wext.keys->defmgmt = wdev->wext.default_mgmt_key;
 293         }
 294
 295         wdev->wext.ibss.privacy = wdev->wext.default_key != -1;
 296
 297         if (wdev->wext.keys) {
 298                 ck = kmemdup(wdev->wext.keys, sizeof(*ck), GFP_KERNEL);
 299                 if (!ck)
 300                         return -ENOMEM;
 301                 for (i = 0; i < 6; 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_dev(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(wdev->wiphy, 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_IBSS ||
 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                 wdev->wext.ibss.chandef.chan = chan;
 355                 wdev->wext.ibss.chandef.width = NL80211_CHAN_WIDTH_20_NOHT;
 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         mutex_lock(&rdev->devlist_mtx);
 363         wdev_lock(wdev);
 364         err = cfg80211_ibss_wext_join(rdev, wdev);
 365         wdev_unlock(wdev);
 366         mutex_unlock(&rdev->devlist_mtx);
 367
 368         return err;
 369 }
 370
 371 int cfg80211_ibss_wext_giwfreq(struct net_device *dev,
 372                                struct iw_request_info *info,
 373                                struct iw_freq *freq, char *extra)
 374 {
 375         struct wireless_dev *wdev = dev->ieee80211_ptr;
 376         struct ieee80211_channel *chan = NULL;
 377
 378         /* call only for ibss! */
 379         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
 380                 return -EINVAL;
 381
 382         wdev_lock(wdev);
 383         if (wdev->current_bss)
 384                 chan = wdev->current_bss->pub.channel;
 385         else if (wdev->wext.ibss.chandef.chan)
 386                 chan = wdev->wext.ibss.chandef.chan;
 387         wdev_unlock(wdev);
 388
 389         if (chan) {
 390                 freq->m = chan->center_freq;
 391                 freq->e = 6;
 392                 return 0;
 393         }
 394
 395         /* no channel if not joining */
 396         return -EINVAL;
 397 }
 398
 399 int cfg80211_ibss_wext_siwessid(struct net_device *dev,
 400                                 struct iw_request_info *info,
 401                                 struct iw_point *data, char *ssid)
 402 {
 403         struct wireless_dev *wdev = dev->ieee80211_ptr;
 404         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 405         size_t len = data->length;
 406         int err;
 407
 408         /* call only for ibss! */
 409         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
 410                 return -EINVAL;
 411
 412         if (!rdev->ops->join_ibss)
 413                 return -EOPNOTSUPP;
 414
 415         wdev_lock(wdev);
 416         err = 0;
 417         if (wdev->ssid_len)
 418                 err = __cfg80211_leave_ibss(rdev, dev, true);
 419         wdev_unlock(wdev);
 420
 421         if (err)
 422                 return err;
 423
 424         /* iwconfig uses nul termination in SSID.. */
 425         if (len > 0 && ssid[len - 1] == '\0')
 426                 len--;
 427
 428         wdev->wext.ibss.ssid = wdev->ssid;
 429         memcpy(wdev->wext.ibss.ssid, ssid, len);
 430         wdev->wext.ibss.ssid_len = len;
 431
 432         mutex_lock(&rdev->devlist_mtx);
 433         wdev_lock(wdev);
 434         err = cfg80211_ibss_wext_join(rdev, wdev);
 435         wdev_unlock(wdev);
 436         mutex_unlock(&rdev->devlist_mtx);
 437
 438         return err;
 439 }
 440
 441 int cfg80211_ibss_wext_giwessid(struct net_device *dev,
 442                                 struct iw_request_info *info,
 443                                 struct iw_point *data, char *ssid)
 444 {
 445         struct wireless_dev *wdev = dev->ieee80211_ptr;
 446
 447         /* call only for ibss! */
 448         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
 449                 return -EINVAL;
 450
 451         data->flags = 0;
 452
 453         wdev_lock(wdev);
 454         if (wdev->ssid_len) {
 455                 data->flags = 1;
 456                 data->length = wdev->ssid_len;
 457                 memcpy(ssid, wdev->ssid, data->length);
 458         } else if (wdev->wext.ibss.ssid && wdev->wext.ibss.ssid_len) {
 459                 data->flags = 1;
 460                 data->length = wdev->wext.ibss.ssid_len;
 461                 memcpy(ssid, wdev->wext.ibss.ssid, data->length);
 462         }
 463         wdev_unlock(wdev);
 464
 465         return 0;
 466 }
 467
 468 int cfg80211_ibss_wext_siwap(struct net_device *dev,
 469                              struct iw_request_info *info,
 470                              struct sockaddr *ap_addr, char *extra)
 471 {
 472         struct wireless_dev *wdev = dev->ieee80211_ptr;
 473         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 474         u8 *bssid = ap_addr->sa_data;
 475         int err;
 476
 477         /* call only for ibss! */
 478         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
 479                 return -EINVAL;
 480
 481         if (!rdev->ops->join_ibss)
 482                 return -EOPNOTSUPP;
 483
 484         if (ap_addr->sa_family != ARPHRD_ETHER)
 485                 return -EINVAL;
 486
 487         /* automatic mode */
 488         if (is_zero_ether_addr(bssid) || is_broadcast_ether_addr(bssid))
 489                 bssid = NULL;
 490
 491         /* both automatic */
 492         if (!bssid && !wdev->wext.ibss.bssid)
 493                 return 0;
 494
 495         /* fixed already - and no change */
 496         if (wdev->wext.ibss.bssid && bssid &&
 497             ether_addr_equal(bssid, wdev->wext.ibss.bssid))
 498                 return 0;
 499
 500         wdev_lock(wdev);
 501         err = 0;
 502         if (wdev->ssid_len)
 503                 err = __cfg80211_leave_ibss(rdev, dev, true);
 504         wdev_unlock(wdev);
 505
 506         if (err)
 507                 return err;
 508
 509         if (bssid) {
 510                 memcpy(wdev->wext.bssid, bssid, ETH_ALEN);
 511                 wdev->wext.ibss.bssid = wdev->wext.bssid;
 512         } else
 513                 wdev->wext.ibss.bssid = NULL;
 514
 515         mutex_lock(&rdev->devlist_mtx);
 516         wdev_lock(wdev);
 517         err = cfg80211_ibss_wext_join(rdev, wdev);
 518         wdev_unlock(wdev);
 519         mutex_unlock(&rdev->devlist_mtx);
 520
 521         return err;
 522 }
 523
 524 int cfg80211_ibss_wext_giwap(struct net_device *dev,
 525                              struct iw_request_info *info,
 526                              struct sockaddr *ap_addr, char *extra)
 527 {
 528         struct wireless_dev *wdev = dev->ieee80211_ptr;
 529
 530         /* call only for ibss! */
 531         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
 532                 return -EINVAL;
 533
 534         ap_addr->sa_family = ARPHRD_ETHER;
 535
 536         wdev_lock(wdev);
 537         if (wdev->current_bss)
 538                 memcpy(ap_addr->sa_data, wdev->current_bss->pub.bssid, ETH_ALEN);
 539         else if (wdev->wext.ibss.bssid)
 540                 memcpy(ap_addr->sa_data, wdev->wext.ibss.bssid, ETH_ALEN);
 541         else
 542                 memset(ap_addr->sa_data, 0, ETH_ALEN);
 543
 544         wdev_unlock(wdev);
 545
 546         return 0;
 547 }
 548 #endif