net/wireless/ibss.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Some IBSS support code for cfg80211.
   4  *
   5  * Copyright 2009       Johannes Berg <johannes@sipsolutions.net>
   6  */
   7
   8 #include <linux/etherdevice.h>
   9 #include <linux/if_arp.h>
  10 #include <linux/slab.h>
  11 #include <linux/export.h>
  12 #include <net/cfg80211.h>
  13 #include "wext-compat.h"
  14 #include "nl80211.h"
  15 #include "rdev-ops.h"
  16
  17
  18 void __cfg80211_ibss_joined(struct net_device *dev, const u8 *bssid,
  19                             struct ieee80211_channel *channel)
  20 {
  21         struct wireless_dev *wdev = dev->ieee80211_ptr;
  22         struct cfg80211_bss *bss;
  23 #ifdef CONFIG_CFG80211_WEXT
  24         union iwreq_data wrqu;
  25 #endif
  26
  27         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
  28                 return;
  29
  30         if (!wdev->ssid_len)
  31                 return;
  32
  33         bss = cfg80211_get_bss(wdev->wiphy, channel, bssid, NULL, 0,
  34                                IEEE80211_BSS_TYPE_IBSS, IEEE80211_PRIVACY_ANY);
  35
  36         if (WARN_ON(!bss))
  37                 return;
  38
  39         if (wdev->current_bss) {
  40                 cfg80211_unhold_bss(wdev->current_bss);
  41                 cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
  42         }
  43
  44         cfg80211_hold_bss(bss_from_pub(bss));
  45         wdev->current_bss = bss_from_pub(bss);
  46
  47         if (!(wdev->wiphy->flags & WIPHY_FLAG_HAS_STATIC_WEP))
  48                 cfg80211_upload_connect_keys(wdev);
  49
  50         nl80211_send_ibss_bssid(wiphy_to_rdev(wdev->wiphy), dev, bssid,
  51                                 GFP_KERNEL);
  52 #ifdef CONFIG_CFG80211_WEXT
  53         memset(&wrqu, 0, sizeof(wrqu));
  54         memcpy(wrqu.ap_addr.sa_data, bssid, ETH_ALEN);
  55         wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL);
  56 #endif
  57 }
  58
  59 void cfg80211_ibss_joined(struct net_device *dev, const u8 *bssid,
  60                           struct ieee80211_channel *channel, gfp_t gfp)
  61 {
  62         struct wireless_dev *wdev = dev->ieee80211_ptr;
  63         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
  64         struct cfg80211_event *ev;
  65         unsigned long flags;
  66
  67         trace_cfg80211_ibss_joined(dev, bssid, channel);
  68
  69         if (WARN_ON(!channel))
  70                 return;
  71
  72         ev = kzalloc(sizeof(*ev), gfp);
  73         if (!ev)
  74                 return;
  75
  76         ev->type = EVENT_IBSS_JOINED;
  77         memcpy(ev->ij.bssid, bssid, ETH_ALEN);
  78         ev->ij.channel = channel;
  79
  80         spin_lock_irqsave(&wdev->event_lock, flags);
  81         list_add_tail(&ev->list, &wdev->event_list);
  82         spin_unlock_irqrestore(&wdev->event_lock, flags);
  83         queue_work(cfg80211_wq, &rdev->event_work);
  84 }
  85 EXPORT_SYMBOL(cfg80211_ibss_joined);
  86
  87 int __cfg80211_join_ibss(struct cfg80211_registered_device *rdev,
  88                          struct net_device *dev,
  89                          struct cfg80211_ibss_params *params,
  90                          struct cfg80211_cached_keys *connkeys)
  91 {
  92         struct wireless_dev *wdev = dev->ieee80211_ptr;
  93         int err;
  94
  95         ASSERT_RTNL();
  96         ASSERT_WDEV_LOCK(wdev);
  97
  98         if (wdev->ssid_len)
  99                 return -EALREADY;
 100
 101         if (!params->basic_rates) {
 102                 /*
 103                 * If no rates were explicitly configured,
 104                 * use the mandatory rate set for 11b or
 105                 * 11a for maximum compatibility.
 106                 */
 107                 struct ieee80211_supported_band *sband =
 108                         rdev->wiphy.bands[params->chandef.chan->band];
 109                 int j;
 110                 u32 flag = params->chandef.chan->band == NL80211_BAND_5GHZ ?
 111                         IEEE80211_RATE_MANDATORY_A :
 112                         IEEE80211_RATE_MANDATORY_B;
 113
 114                 for (j = 0; j < sband->n_bitrates; j++) {
 115                         if (sband->bitrates[j].flags & flag)
 116                                 params->basic_rates |= BIT(j);
 117                 }
 118         }
 119
 120         if (WARN_ON(connkeys && connkeys->def < 0))
 121                 return -EINVAL;
 122
 123         if (WARN_ON(wdev->connect_keys))
 124                 kzfree(wdev->connect_keys);
 125         wdev->connect_keys = connkeys;
 126
 127         wdev->ibss_fixed = params->channel_fixed;
 128         wdev->ibss_dfs_possible = params->userspace_handles_dfs;
 129         wdev->chandef = params->chandef;
 130         if (connkeys) {
 131                 params->wep_keys = connkeys->params;
 132                 params->wep_tx_key = connkeys->def;
 133         }
 134
 135 #ifdef CONFIG_CFG80211_WEXT
 136         wdev->wext.ibss.chandef = params->chandef;
 137 #endif
 138         err = rdev_join_ibss(rdev, dev, params);
 139         if (err) {
 140                 wdev->connect_keys = NULL;
 141                 return err;
 142         }
 143
 144         memcpy(wdev->ssid, params->ssid, params->ssid_len);
 145         wdev->ssid_len = params->ssid_len;
 146
 147         return 0;
 148 }
 149
 150 static void __cfg80211_clear_ibss(struct net_device *dev, bool nowext)
 151 {
 152         struct wireless_dev *wdev = dev->ieee80211_ptr;
 153         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 154         int i;
 155
 156         ASSERT_WDEV_LOCK(wdev);
 157
 158         kzfree(wdev->connect_keys);
 159         wdev->connect_keys = NULL;
 160
 161         rdev_set_qos_map(rdev, dev, NULL);
 162
 163         /*
 164          * Delete all the keys ... pairwise keys can't really
 165          * exist any more anyway, but default keys might.
 166          */
 167         if (rdev->ops->del_key)
 168                 for (i = 0; i < 6; i++)
 169                         rdev_del_key(rdev, dev, i, false, NULL);
 170
 171         if (wdev->current_bss) {
 172                 cfg80211_unhold_bss(wdev->current_bss);
 173                 cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
 174         }
 175
 176         wdev->current_bss = NULL;
 177         wdev->ssid_len = 0;
 178         memset(&wdev->chandef, 0, sizeof(wdev->chandef));
 179 #ifdef CONFIG_CFG80211_WEXT
 180         if (!nowext)
 181                 wdev->wext.ibss.ssid_len = 0;
 182 #endif
 183         cfg80211_sched_dfs_chan_update(rdev);
 184 }
 185
 186 void cfg80211_clear_ibss(struct net_device *dev, bool nowext)
 187 {
 188         struct wireless_dev *wdev = dev->ieee80211_ptr;
 189
 190         wdev_lock(wdev);
 191         __cfg80211_clear_ibss(dev, nowext);
 192         wdev_unlock(wdev);
 193 }
 194
 195 int __cfg80211_leave_ibss(struct cfg80211_registered_device *rdev,
 196                           struct net_device *dev, bool nowext)
 197 {
 198         struct wireless_dev *wdev = dev->ieee80211_ptr;
 199         int err;
 200
 201         ASSERT_WDEV_LOCK(wdev);
 202
 203         if (!wdev->ssid_len)
 204                 return -ENOLINK;
 205
 206         err = rdev_leave_ibss(rdev, dev);
 207
 208         if (err)
 209                 return err;
 210
 211         wdev->conn_owner_nlportid = 0;
 212         __cfg80211_clear_ibss(dev, nowext);
 213
 214         return 0;
 215 }
 216
 217 int cfg80211_leave_ibss(struct cfg80211_registered_device *rdev,
 218                         struct net_device *dev, bool nowext)
 219 {
 220         struct wireless_dev *wdev = dev->ieee80211_ptr;
 221         int err;
 222
 223         wdev_lock(wdev);
 224         err = __cfg80211_leave_ibss(rdev, dev, nowext);
 225         wdev_unlock(wdev);
 226
 227         return err;
 228 }
 229
 230 #ifdef CONFIG_CFG80211_WEXT
 231 int cfg80211_ibss_wext_join(struct cfg80211_registered_device *rdev,
 232                             struct wireless_dev *wdev)
 233 {
 234         struct cfg80211_cached_keys *ck = NULL;
 235         enum nl80211_band band;
 236         int i, err;
 237
 238         ASSERT_WDEV_LOCK(wdev);
 239
 240         if (!wdev->wext.ibss.beacon_interval)
 241                 wdev->wext.ibss.beacon_interval = 100;
 242
 243         /* try to find an IBSS channel if none requested ... */
 244         if (!wdev->wext.ibss.chandef.chan) {
 245                 struct ieee80211_channel *new_chan = NULL;
 246
 247                 for (band = 0; band < NUM_NL80211_BANDS; band++) {
 248                         struct ieee80211_supported_band *sband;
 249                         struct ieee80211_channel *chan;
 250
 251                         sband = rdev->wiphy.bands[band];
 252                         if (!sband)
 253                                 continue;
 254
 255                         for (i = 0; i < sband->n_channels; i++) {
 256                                 chan = &sband->channels[i];
 257                                 if (chan->flags & IEEE80211_CHAN_NO_IR)
 258                                         continue;
 259                                 if (chan->flags & IEEE80211_CHAN_DISABLED)
 260                                         continue;
 261                                 new_chan = chan;
 262                                 break;
 263                         }
 264
 265                         if (new_chan)
 266                                 break;
 267                 }
 268
 269                 if (!new_chan)
 270                         return -EINVAL;
 271
 272                 cfg80211_chandef_create(&wdev->wext.ibss.chandef, new_chan,
 273                                         NL80211_CHAN_NO_HT);
 274         }
 275
 276         /* don't join -- SSID is not there */
 277         if (!wdev->wext.ibss.ssid_len)
 278                 return 0;
 279
 280         if (!netif_running(wdev->netdev))
 281                 return 0;
 282
 283         if (wdev->wext.keys)
 284                 wdev->wext.keys->def = wdev->wext.default_key;
 285
 286         wdev->wext.ibss.privacy = wdev->wext.default_key != -1;
 287
 288         if (wdev->wext.keys && wdev->wext.keys->def != -1) {
 289                 ck = kmemdup(wdev->wext.keys, sizeof(*ck), GFP_KERNEL);
 290                 if (!ck)
 291                         return -ENOMEM;
 292                 for (i = 0; i < CFG80211_MAX_WEP_KEYS; i++)
 293                         ck->params[i].key = ck->data[i];
 294         }
 295         err = __cfg80211_join_ibss(rdev, wdev->netdev,
 296                                    &wdev->wext.ibss, ck);
 297         if (err)
 298                 kfree(ck);
 299
 300         return err;
 301 }
 302
 303 int cfg80211_ibss_wext_siwfreq(struct net_device *dev,
 304                                struct iw_request_info *info,
 305                                struct iw_freq *wextfreq, char *extra)
 306 {
 307         struct wireless_dev *wdev = dev->ieee80211_ptr;
 308         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 309         struct ieee80211_channel *chan = NULL;
 310         int err, freq;
 311
 312         /* call only for ibss! */
 313         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
 314                 return -EINVAL;
 315
 316         if (!rdev->ops->join_ibss)
 317                 return -EOPNOTSUPP;
 318
 319         freq = cfg80211_wext_freq(wextfreq);
 320         if (freq < 0)
 321                 return freq;
 322
 323         if (freq) {
 324                 chan = ieee80211_get_channel(wdev->wiphy, freq);
 325                 if (!chan)
 326                         return -EINVAL;
 327                 if (chan->flags & IEEE80211_CHAN_NO_IR ||
 328                     chan->flags & IEEE80211_CHAN_DISABLED)
 329                         return -EINVAL;
 330         }
 331
 332         if (wdev->wext.ibss.chandef.chan == chan)
 333                 return 0;
 334
 335         wdev_lock(wdev);
 336         err = 0;
 337         if (wdev->ssid_len)
 338                 err = __cfg80211_leave_ibss(rdev, dev, true);
 339         wdev_unlock(wdev);
 340
 341         if (err)
 342                 return err;
 343
 344         if (chan) {
 345                 cfg80211_chandef_create(&wdev->wext.ibss.chandef, chan,
 346                                         NL80211_CHAN_NO_HT);
 347                 wdev->wext.ibss.channel_fixed = true;
 348         } else {
 349                 /* cfg80211_ibss_wext_join will pick one if needed */
 350                 wdev->wext.ibss.channel_fixed = false;
 351         }
 352
 353         wdev_lock(wdev);
 354         err = cfg80211_ibss_wext_join(rdev, wdev);
 355         wdev_unlock(wdev);
 356
 357         return err;
 358 }
 359
 360 int cfg80211_ibss_wext_giwfreq(struct net_device *dev,
 361                                struct iw_request_info *info,
 362                                struct iw_freq *freq, char *extra)
 363 {
 364         struct wireless_dev *wdev = dev->ieee80211_ptr;
 365         struct ieee80211_channel *chan = NULL;
 366
 367         /* call only for ibss! */
 368         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
 369                 return -EINVAL;
 370
 371         wdev_lock(wdev);
 372         if (wdev->current_bss)
 373                 chan = wdev->current_bss->pub.channel;
 374         else if (wdev->wext.ibss.chandef.chan)
 375                 chan = wdev->wext.ibss.chandef.chan;
 376         wdev_unlock(wdev);
 377
 378         if (chan) {
 379                 freq->m = chan->center_freq;
 380                 freq->e = 6;
 381                 return 0;
 382         }
 383
 384         /* no channel if not joining */
 385         return -EINVAL;
 386 }
 387
 388 int cfg80211_ibss_wext_siwessid(struct net_device *dev,
 389                                 struct iw_request_info *info,
 390                                 struct iw_point *data, char *ssid)
 391 {
 392         struct wireless_dev *wdev = dev->ieee80211_ptr;
 393         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 394         size_t len = data->length;
 395         int err;
 396
 397         /* call only for ibss! */
 398         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
 399                 return -EINVAL;
 400
 401         if (!rdev->ops->join_ibss)
 402                 return -EOPNOTSUPP;
 403
 404         wdev_lock(wdev);
 405         err = 0;
 406         if (wdev->ssid_len)
 407                 err = __cfg80211_leave_ibss(rdev, dev, true);
 408         wdev_unlock(wdev);
 409
 410         if (err)
 411                 return err;
 412
 413         /* iwconfig uses nul termination in SSID.. */
 414         if (len > 0 && ssid[len - 1] == '\0')
 415                 len--;
 416
 417         memcpy(wdev->ssid, ssid, len);
 418         wdev->wext.ibss.ssid = wdev->ssid;
 419         wdev->wext.ibss.ssid_len = len;
 420
 421         wdev_lock(wdev);
 422         err = cfg80211_ibss_wext_join(rdev, wdev);
 423         wdev_unlock(wdev);
 424
 425         return err;
 426 }
 427
 428 int cfg80211_ibss_wext_giwessid(struct net_device *dev,
 429                                 struct iw_request_info *info,
 430                                 struct iw_point *data, char *ssid)
 431 {
 432         struct wireless_dev *wdev = dev->ieee80211_ptr;
 433
 434         /* call only for ibss! */
 435         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
 436                 return -EINVAL;
 437
 438         data->flags = 0;
 439
 440         wdev_lock(wdev);
 441         if (wdev->ssid_len) {
 442                 data->flags = 1;
 443                 data->length = wdev->ssid_len;
 444                 memcpy(ssid, wdev->ssid, data->length);
 445         } else if (wdev->wext.ibss.ssid && wdev->wext.ibss.ssid_len) {
 446                 data->flags = 1;
 447                 data->length = wdev->wext.ibss.ssid_len;
 448                 memcpy(ssid, wdev->wext.ibss.ssid, data->length);
 449         }
 450         wdev_unlock(wdev);
 451
 452         return 0;
 453 }
 454
 455 int cfg80211_ibss_wext_siwap(struct net_device *dev,
 456                              struct iw_request_info *info,
 457                              struct sockaddr *ap_addr, char *extra)
 458 {
 459         struct wireless_dev *wdev = dev->ieee80211_ptr;
 460         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 461         u8 *bssid = ap_addr->sa_data;
 462         int err;
 463
 464         /* call only for ibss! */
 465         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
 466                 return -EINVAL;
 467
 468         if (!rdev->ops->join_ibss)
 469                 return -EOPNOTSUPP;
 470
 471         if (ap_addr->sa_family != ARPHRD_ETHER)
 472                 return -EINVAL;
 473
 474         /* automatic mode */
 475         if (is_zero_ether_addr(bssid) || is_broadcast_ether_addr(bssid))
 476                 bssid = NULL;
 477
 478         if (bssid && !is_valid_ether_addr(bssid))
 479                 return -EINVAL;
 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                 eth_zero_addr(ap_addr->sa_data);
 531
 532         wdev_unlock(wdev);
 533
 534         return 0;
 535 }
 536 #endif