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                                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,
  58                           struct ieee80211_channel *channel, 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, channel);
  66
  67         if (WARN_ON(!channel))
  68                 return;
  69
  70         ev = kzalloc(sizeof(*ev), gfp);
  71         if (!ev)
  72                 return;
  73
  74         ev->type = EVENT_IBSS_JOINED;
  75         memcpy(ev->ij.bssid, bssid, ETH_ALEN);
  76         ev->ij.channel = channel;
  77
  78         spin_lock_irqsave(&wdev->event_lock, flags);
  79         list_add_tail(&ev->list, &wdev->event_list);
  80         spin_unlock_irqrestore(&wdev->event_lock, flags);
  81         queue_work(cfg80211_wq, &rdev->event_work);
  82 }
  83 EXPORT_SYMBOL(cfg80211_ibss_joined);
  84
  85 static int __cfg80211_join_ibss(struct cfg80211_registered_device *rdev,
  86                                 struct net_device *dev,
  87                                 struct cfg80211_ibss_params *params,
  88                                 struct cfg80211_cached_keys *connkeys)
  89 {
  90         struct wireless_dev *wdev = dev->ieee80211_ptr;
  91         struct ieee80211_channel *check_chan;
  92         u8 radar_detect_width = 0;
  93         int err;
  94
  95         ASSERT_WDEV_LOCK(wdev);
  96
  97         if (wdev->ssid_len)
  98                 return -EALREADY;
  99
 100         if (!params->basic_rates) {
 101                 /*
 102                 * If no rates were explicitly configured,
 103                 * use the mandatory rate set for 11b or
 104                 * 11a for maximum compatibility.
 105                 */
 106                 struct ieee80211_supported_band *sband =
 107                         rdev->wiphy.bands[params->chandef.chan->band];
 108                 int j;
 109                 u32 flag = params->chandef.chan->band == IEEE80211_BAND_5GHZ ?
 110                         IEEE80211_RATE_MANDATORY_A :
 111                         IEEE80211_RATE_MANDATORY_B;
 112
 113                 for (j = 0; j < sband->n_bitrates; j++) {
 114                         if (sband->bitrates[j].flags & flag)
 115                                 params->basic_rates |= BIT(j);
 116                 }
 117         }
 118
 119         if (WARN_ON(wdev->connect_keys))
 120                 kfree(wdev->connect_keys);
 121         wdev->connect_keys = connkeys;
 122
 123         wdev->ibss_fixed = params->channel_fixed;
 124         wdev->ibss_dfs_possible = params->userspace_handles_dfs;
 125         wdev->chandef = params->chandef;
 126 #ifdef CONFIG_CFG80211_WEXT
 127         wdev->wext.ibss.chandef = params->chandef;
 128 #endif
 129         check_chan = params->chandef.chan;
 130         if (params->userspace_handles_dfs) {
 131                 /* Check for radar even if the current channel is not
 132                  * a radar channel - it might decide to change to DFS
 133                  * channel later.
 134                  */
 135                 radar_detect_width = BIT(params->chandef.width);
 136         }
 137
 138         err = cfg80211_can_use_iftype_chan(rdev, wdev, wdev->iftype,
 139                                            check_chan,
 140                                            (params->channel_fixed &&
 141                                             !radar_detect_width)
 142                                            ? CHAN_MODE_SHARED
 143                                            : CHAN_MODE_EXCLUSIVE,
 144                                            radar_detect_width);
 145
 146         if (err) {
 147                 wdev->connect_keys = NULL;
 148                 return err;
 149         }
 150
 151         err = rdev_join_ibss(rdev, dev, params);
 152         if (err) {
 153                 wdev->connect_keys = NULL;
 154                 return err;
 155         }
 156
 157         memcpy(wdev->ssid, params->ssid, params->ssid_len);
 158         wdev->ssid_len = params->ssid_len;
 159
 160         return 0;
 161 }
 162
 163 int cfg80211_join_ibss(struct cfg80211_registered_device *rdev,
 164                        struct net_device *dev,
 165                        struct cfg80211_ibss_params *params,
 166                        struct cfg80211_cached_keys *connkeys)
 167 {
 168         struct wireless_dev *wdev = dev->ieee80211_ptr;
 169         int err;
 170
 171         ASSERT_RTNL();
 172
 173         wdev_lock(wdev);
 174         err = __cfg80211_join_ibss(rdev, dev, params, connkeys);
 175         wdev_unlock(wdev);
 176
 177         return err;
 178 }
 179
 180 static void __cfg80211_clear_ibss(struct net_device *dev, bool nowext)
 181 {
 182         struct wireless_dev *wdev = dev->ieee80211_ptr;
 183         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 184         int i;
 185
 186         ASSERT_WDEV_LOCK(wdev);
 187
 188         kfree(wdev->connect_keys);
 189         wdev->connect_keys = NULL;
 190
 191         rdev_set_qos_map(rdev, dev, NULL);
 192
 193         /*
 194          * Delete all the keys ... pairwise keys can't really
 195          * exist any more anyway, but default keys might.
 196          */
 197         if (rdev->ops->del_key)
 198                 for (i = 0; i < 6; i++)
 199                         rdev_del_key(rdev, dev, i, false, NULL);
 200
 201         if (wdev->current_bss) {
 202                 cfg80211_unhold_bss(wdev->current_bss);
 203                 cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
 204         }
 205
 206         wdev->current_bss = NULL;
 207         wdev->ssid_len = 0;
 208         memset(&wdev->chandef, 0, sizeof(wdev->chandef));
 209 #ifdef CONFIG_CFG80211_WEXT
 210         if (!nowext)
 211                 wdev->wext.ibss.ssid_len = 0;
 212 #endif
 213 }
 214
 215 void cfg80211_clear_ibss(struct net_device *dev, bool nowext)
 216 {
 217         struct wireless_dev *wdev = dev->ieee80211_ptr;
 218
 219         wdev_lock(wdev);
 220         __cfg80211_clear_ibss(dev, nowext);
 221         wdev_unlock(wdev);
 222 }
 223
 224 int __cfg80211_leave_ibss(struct cfg80211_registered_device *rdev,
 225                           struct net_device *dev, bool nowext)
 226 {
 227         struct wireless_dev *wdev = dev->ieee80211_ptr;
 228         int err;
 229
 230         ASSERT_WDEV_LOCK(wdev);
 231
 232         if (!wdev->ssid_len)
 233                 return -ENOLINK;
 234
 235         err = rdev_leave_ibss(rdev, dev);
 236
 237         if (err)
 238                 return err;
 239
 240         __cfg80211_clear_ibss(dev, nowext);
 241
 242         return 0;
 243 }
 244
 245 int cfg80211_leave_ibss(struct cfg80211_registered_device *rdev,
 246                         struct net_device *dev, bool nowext)
 247 {
 248         struct wireless_dev *wdev = dev->ieee80211_ptr;
 249         int err;
 250
 251         wdev_lock(wdev);
 252         err = __cfg80211_leave_ibss(rdev, dev, nowext);
 253         wdev_unlock(wdev);
 254
 255         return err;
 256 }
 257
 258 #ifdef CONFIG_CFG80211_WEXT
 259 int cfg80211_ibss_wext_join(struct cfg80211_registered_device *rdev,
 260                             struct wireless_dev *wdev)
 261 {
 262         struct cfg80211_cached_keys *ck = NULL;
 263         enum ieee80211_band band;
 264         int i, err;
 265
 266         ASSERT_WDEV_LOCK(wdev);
 267
 268         if (!wdev->wext.ibss.beacon_interval)
 269                 wdev->wext.ibss.beacon_interval = 100;
 270
 271         /* try to find an IBSS channel if none requested ... */
 272         if (!wdev->wext.ibss.chandef.chan) {
 273                 struct ieee80211_channel *new_chan = NULL;
 274
 275                 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 276                         struct ieee80211_supported_band *sband;
 277                         struct ieee80211_channel *chan;
 278
 279                         sband = rdev->wiphy.bands[band];
 280                         if (!sband)
 281                                 continue;
 282
 283                         for (i = 0; i < sband->n_channels; i++) {
 284                                 chan = &sband->channels[i];
 285                                 if (chan->flags & IEEE80211_CHAN_NO_IR)
 286                                         continue;
 287                                 if (chan->flags & IEEE80211_CHAN_DISABLED)
 288                                         continue;
 289                                 new_chan = chan;
 290                                 break;
 291                         }
 292
 293                         if (new_chan)
 294                                 break;
 295                 }
 296
 297                 if (!new_chan)
 298                         return -EINVAL;
 299
 300                 cfg80211_chandef_create(&wdev->wext.ibss.chandef, new_chan,
 301                                         NL80211_CHAN_NO_HT);
 302         }
 303
 304         /* don't join -- SSID is not there */
 305         if (!wdev->wext.ibss.ssid_len)
 306                 return 0;
 307
 308         if (!netif_running(wdev->netdev))
 309                 return 0;
 310
 311         if (wdev->wext.keys) {
 312                 wdev->wext.keys->def = wdev->wext.default_key;
 313                 wdev->wext.keys->defmgmt = wdev->wext.default_mgmt_key;
 314         }
 315
 316         wdev->wext.ibss.privacy = wdev->wext.default_key != -1;
 317
 318         if (wdev->wext.keys) {
 319                 ck = kmemdup(wdev->wext.keys, sizeof(*ck), GFP_KERNEL);
 320                 if (!ck)
 321                         return -ENOMEM;
 322                 for (i = 0; i < 6; i++)
 323                         ck->params[i].key = ck->data[i];
 324         }
 325         err = __cfg80211_join_ibss(rdev, wdev->netdev,
 326                                    &wdev->wext.ibss, ck);
 327         if (err)
 328                 kfree(ck);
 329
 330         return err;
 331 }
 332
 333 int cfg80211_ibss_wext_siwfreq(struct net_device *dev,
 334                                struct iw_request_info *info,
 335                                struct iw_freq *wextfreq, char *extra)
 336 {
 337         struct wireless_dev *wdev = dev->ieee80211_ptr;
 338         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 339         struct ieee80211_channel *chan = NULL;
 340         int err, freq;
 341
 342         /* call only for ibss! */
 343         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
 344                 return -EINVAL;
 345
 346         if (!rdev->ops->join_ibss)
 347                 return -EOPNOTSUPP;
 348
 349         freq = cfg80211_wext_freq(wdev->wiphy, wextfreq);
 350         if (freq < 0)
 351                 return freq;
 352
 353         if (freq) {
 354                 chan = ieee80211_get_channel(wdev->wiphy, freq);
 355                 if (!chan)
 356                         return -EINVAL;
 357                 if (chan->flags & IEEE80211_CHAN_NO_IR ||
 358                     chan->flags & IEEE80211_CHAN_DISABLED)
 359                         return -EINVAL;
 360         }
 361
 362         if (wdev->wext.ibss.chandef.chan == chan)
 363                 return 0;
 364
 365         wdev_lock(wdev);
 366         err = 0;
 367         if (wdev->ssid_len)
 368                 err = __cfg80211_leave_ibss(rdev, dev, true);
 369         wdev_unlock(wdev);
 370
 371         if (err)
 372                 return err;
 373
 374         if (chan) {
 375                 cfg80211_chandef_create(&wdev->wext.ibss.chandef, chan,
 376                                         NL80211_CHAN_NO_HT);
 377                 wdev->wext.ibss.channel_fixed = true;
 378         } else {
 379                 /* cfg80211_ibss_wext_join will pick one if needed */
 380                 wdev->wext.ibss.channel_fixed = false;
 381         }
 382
 383         wdev_lock(wdev);
 384         err = cfg80211_ibss_wext_join(rdev, wdev);
 385         wdev_unlock(wdev);
 386
 387         return err;
 388 }
 389
 390 int cfg80211_ibss_wext_giwfreq(struct net_device *dev,
 391                                struct iw_request_info *info,
 392                                struct iw_freq *freq, char *extra)
 393 {
 394         struct wireless_dev *wdev = dev->ieee80211_ptr;
 395         struct ieee80211_channel *chan = NULL;
 396
 397         /* call only for ibss! */
 398         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
 399                 return -EINVAL;
 400
 401         wdev_lock(wdev);
 402         if (wdev->current_bss)
 403                 chan = wdev->current_bss->pub.channel;
 404         else if (wdev->wext.ibss.chandef.chan)
 405                 chan = wdev->wext.ibss.chandef.chan;
 406         wdev_unlock(wdev);
 407
 408         if (chan) {
 409                 freq->m = chan->center_freq;
 410                 freq->e = 6;
 411                 return 0;
 412         }
 413
 414         /* no channel if not joining */
 415         return -EINVAL;
 416 }
 417
 418 int cfg80211_ibss_wext_siwessid(struct net_device *dev,
 419                                 struct iw_request_info *info,
 420                                 struct iw_point *data, char *ssid)
 421 {
 422         struct wireless_dev *wdev = dev->ieee80211_ptr;
 423         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 424         size_t len = data->length;
 425         int err;
 426
 427         /* call only for ibss! */
 428         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
 429                 return -EINVAL;
 430
 431         if (!rdev->ops->join_ibss)
 432                 return -EOPNOTSUPP;
 433
 434         wdev_lock(wdev);
 435         err = 0;
 436         if (wdev->ssid_len)
 437                 err = __cfg80211_leave_ibss(rdev, dev, true);
 438         wdev_unlock(wdev);
 439
 440         if (err)
 441                 return err;
 442
 443         /* iwconfig uses nul termination in SSID.. */
 444         if (len > 0 && ssid[len - 1] == '\0')
 445                 len--;
 446
 447         wdev->wext.ibss.ssid = wdev->ssid;
 448         memcpy(wdev->wext.ibss.ssid, ssid, len);
 449         wdev->wext.ibss.ssid_len = len;
 450
 451         wdev_lock(wdev);
 452         err = cfg80211_ibss_wext_join(rdev, wdev);
 453         wdev_unlock(wdev);
 454
 455         return err;
 456 }
 457
 458 int cfg80211_ibss_wext_giwessid(struct net_device *dev,
 459                                 struct iw_request_info *info,
 460                                 struct iw_point *data, char *ssid)
 461 {
 462         struct wireless_dev *wdev = dev->ieee80211_ptr;
 463
 464         /* call only for ibss! */
 465         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
 466                 return -EINVAL;
 467
 468         data->flags = 0;
 469
 470         wdev_lock(wdev);
 471         if (wdev->ssid_len) {
 472                 data->flags = 1;
 473                 data->length = wdev->ssid_len;
 474                 memcpy(ssid, wdev->ssid, data->length);
 475         } else if (wdev->wext.ibss.ssid && wdev->wext.ibss.ssid_len) {
 476                 data->flags = 1;
 477                 data->length = wdev->wext.ibss.ssid_len;
 478                 memcpy(ssid, wdev->wext.ibss.ssid, data->length);
 479         }
 480         wdev_unlock(wdev);
 481
 482         return 0;
 483 }
 484
 485 int cfg80211_ibss_wext_siwap(struct net_device *dev,
 486                              struct iw_request_info *info,
 487                              struct sockaddr *ap_addr, char *extra)
 488 {
 489         struct wireless_dev *wdev = dev->ieee80211_ptr;
 490         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 491         u8 *bssid = ap_addr->sa_data;
 492         int err;
 493
 494         /* call only for ibss! */
 495         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
 496                 return -EINVAL;
 497
 498         if (!rdev->ops->join_ibss)
 499                 return -EOPNOTSUPP;
 500
 501         if (ap_addr->sa_family != ARPHRD_ETHER)
 502                 return -EINVAL;
 503
 504         /* automatic mode */
 505         if (is_zero_ether_addr(bssid) || is_broadcast_ether_addr(bssid))
 506                 bssid = NULL;
 507
 508         /* both automatic */
 509         if (!bssid && !wdev->wext.ibss.bssid)
 510                 return 0;
 511
 512         /* fixed already - and no change */
 513         if (wdev->wext.ibss.bssid && bssid &&
 514             ether_addr_equal(bssid, wdev->wext.ibss.bssid))
 515                 return 0;
 516
 517         wdev_lock(wdev);
 518         err = 0;
 519         if (wdev->ssid_len)
 520                 err = __cfg80211_leave_ibss(rdev, dev, true);
 521         wdev_unlock(wdev);
 522
 523         if (err)
 524                 return err;
 525
 526         if (bssid) {
 527                 memcpy(wdev->wext.bssid, bssid, ETH_ALEN);
 528                 wdev->wext.ibss.bssid = wdev->wext.bssid;
 529         } else
 530                 wdev->wext.ibss.bssid = NULL;
 531
 532         wdev_lock(wdev);
 533         err = cfg80211_ibss_wext_join(rdev, wdev);
 534         wdev_unlock(wdev);
 535
 536         return err;
 537 }
 538
 539 int cfg80211_ibss_wext_giwap(struct net_device *dev,
 540                              struct iw_request_info *info,
 541                              struct sockaddr *ap_addr, char *extra)
 542 {
 543         struct wireless_dev *wdev = dev->ieee80211_ptr;
 544
 545         /* call only for ibss! */
 546         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
 547                 return -EINVAL;
 548
 549         ap_addr->sa_family = ARPHRD_ETHER;
 550
 551         wdev_lock(wdev);
 552         if (wdev->current_bss)
 553                 memcpy(ap_addr->sa_data, wdev->current_bss->pub.bssid, ETH_ALEN);
 554         else if (wdev->wext.ibss.bssid)
 555                 memcpy(ap_addr->sa_data, wdev->wext.ibss.bssid, ETH_ALEN);
 556         else
 557                 memset(ap_addr->sa_data, 0, ETH_ALEN);
 558
 559         wdev_unlock(wdev);
 560
 561         return 0;
 562 }
 563 #endif