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  * Copyright (C) 2020-2022 Intel Corporation
   7  */
   8
   9 #include <linux/etherdevice.h>
  10 #include <linux/if_arp.h>
  11 #include <linux/slab.h>
  12 #include <linux/export.h>
  13 #include <net/cfg80211.h>
  14 #include "wext-compat.h"
  15 #include "nl80211.h"
  16 #include "rdev-ops.h"
  17
  18
  19 void __cfg80211_ibss_joined(struct net_device *dev, const u8 *bssid,
  20                             struct ieee80211_channel *channel)
  21 {
  22         struct wireless_dev *wdev = dev->ieee80211_ptr;
  23         struct cfg80211_bss *bss;
  24 #ifdef CONFIG_CFG80211_WEXT
  25         union iwreq_data wrqu;
  26 #endif
  27
  28         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
  29                 return;
  30
  31         if (!wdev->u.ibss.ssid_len)
  32                 return;
  33
  34         bss = cfg80211_get_bss(wdev->wiphy, channel, bssid, NULL, 0,
  35                                IEEE80211_BSS_TYPE_IBSS, IEEE80211_PRIVACY_ANY);
  36
  37         if (WARN_ON(!bss))
  38                 return;
  39
  40         if (wdev->u.ibss.current_bss) {
  41                 cfg80211_unhold_bss(wdev->u.ibss.current_bss);
  42                 cfg80211_put_bss(wdev->wiphy, &wdev->u.ibss.current_bss->pub);
  43         }
  44
  45         cfg80211_hold_bss(bss_from_pub(bss));
  46         wdev->u.ibss.current_bss = bss_from_pub(bss);
  47
  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         lockdep_assert_held(&rdev->wiphy.mtx);
  96         ASSERT_WDEV_LOCK(wdev);
  97
  98         if (wdev->u.ibss.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                 enum nl80211_band band;
 109                 u32 flag;
 110                 int j;
 111
 112                 band = params->chandef.chan->band;
 113                 if (band == NL80211_BAND_5GHZ ||
 114                     band == NL80211_BAND_6GHZ)
 115                         flag = IEEE80211_RATE_MANDATORY_A;
 116                 else
 117                         flag = IEEE80211_RATE_MANDATORY_B;
 118
 119                 sband = rdev->wiphy.bands[band];
 120                 for (j = 0; j < sband->n_bitrates; j++) {
 121                         if (sband->bitrates[j].flags & flag)
 122                                 params->basic_rates |= BIT(j);
 123                 }
 124         }
 125
 126         if (WARN_ON(connkeys && connkeys->def < 0))
 127                 return -EINVAL;
 128
 129         if (WARN_ON(wdev->connect_keys))
 130                 kfree_sensitive(wdev->connect_keys);
 131         wdev->connect_keys = connkeys;
 132
 133         wdev->u.ibss.chandef = params->chandef;
 134         if (connkeys) {
 135                 params->wep_keys = connkeys->params;
 136                 params->wep_tx_key = connkeys->def;
 137         }
 138
 139 #ifdef CONFIG_CFG80211_WEXT
 140         wdev->wext.ibss.chandef = params->chandef;
 141 #endif
 142         err = rdev_join_ibss(rdev, dev, params);
 143         if (err) {
 144                 wdev->connect_keys = NULL;
 145                 return err;
 146         }
 147
 148         memcpy(wdev->u.ibss.ssid, params->ssid, params->ssid_len);
 149         wdev->u.ibss.ssid_len = params->ssid_len;
 150
 151         return 0;
 152 }
 153
 154 static void __cfg80211_clear_ibss(struct net_device *dev, bool nowext)
 155 {
 156         struct wireless_dev *wdev = dev->ieee80211_ptr;
 157         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 158         int i;
 159
 160         ASSERT_WDEV_LOCK(wdev);
 161
 162         kfree_sensitive(wdev->connect_keys);
 163         wdev->connect_keys = NULL;
 164
 165         rdev_set_qos_map(rdev, dev, NULL);
 166
 167         /*
 168          * Delete all the keys ... pairwise keys can't really
 169          * exist any more anyway, but default keys might.
 170          */
 171         if (rdev->ops->del_key)
 172                 for (i = 0; i < 6; i++)
 173                         rdev_del_key(rdev, dev, -1, i, false, NULL);
 174
 175         if (wdev->u.ibss.current_bss) {
 176                 cfg80211_unhold_bss(wdev->u.ibss.current_bss);
 177                 cfg80211_put_bss(wdev->wiphy, &wdev->u.ibss.current_bss->pub);
 178         }
 179
 180         wdev->u.ibss.current_bss = NULL;
 181         wdev->u.ibss.ssid_len = 0;
 182         memset(&wdev->u.ibss.chandef, 0, sizeof(wdev->u.ibss.chandef));
 183 #ifdef CONFIG_CFG80211_WEXT
 184         if (!nowext)
 185                 wdev->wext.ibss.ssid_len = 0;
 186 #endif
 187         cfg80211_sched_dfs_chan_update(rdev);
 188 }
 189
 190 void cfg80211_clear_ibss(struct net_device *dev, bool nowext)
 191 {
 192         struct wireless_dev *wdev = dev->ieee80211_ptr;
 193
 194         wdev_lock(wdev);
 195         __cfg80211_clear_ibss(dev, nowext);
 196         wdev_unlock(wdev);
 197 }
 198
 199 int __cfg80211_leave_ibss(struct cfg80211_registered_device *rdev,
 200                           struct net_device *dev, bool nowext)
 201 {
 202         struct wireless_dev *wdev = dev->ieee80211_ptr;
 203         int err;
 204
 205         ASSERT_WDEV_LOCK(wdev);
 206
 207         if (!wdev->u.ibss.ssid_len)
 208                 return -ENOLINK;
 209
 210         err = rdev_leave_ibss(rdev, dev);
 211
 212         if (err)
 213                 return err;
 214
 215         wdev->conn_owner_nlportid = 0;
 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 nl80211_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                 struct ieee80211_channel *new_chan = NULL;
 250
 251                 for (band = 0; band < NUM_NL80211_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_IR)
 262                                         continue;
 263                                 if (chan->flags & IEEE80211_CHAN_DISABLED)
 264                                         continue;
 265                                 new_chan = chan;
 266                                 break;
 267                         }
 268
 269                         if (new_chan)
 270                                 break;
 271                 }
 272
 273                 if (!new_chan)
 274                         return -EINVAL;
 275
 276                 cfg80211_chandef_create(&wdev->wext.ibss.chandef, new_chan,
 277                                         NL80211_CHAN_NO_HT);
 278         }
 279
 280         /* don't join -- SSID is not there */
 281         if (!wdev->wext.ibss.ssid_len)
 282                 return 0;
 283
 284         if (!netif_running(wdev->netdev))
 285                 return 0;
 286
 287         if (wdev->wext.keys)
 288                 wdev->wext.keys->def = wdev->wext.default_key;
 289
 290         wdev->wext.ibss.privacy = wdev->wext.default_key != -1;
 291
 292         if (wdev->wext.keys && wdev->wext.keys->def != -1) {
 293                 ck = kmemdup(wdev->wext.keys, sizeof(*ck), GFP_KERNEL);
 294                 if (!ck)
 295                         return -ENOMEM;
 296                 for (i = 0; i < 4; i++)
 297                         ck->params[i].key = ck->data[i];
 298         }
 299         err = __cfg80211_join_ibss(rdev, wdev->netdev,
 300                                    &wdev->wext.ibss, ck);
 301         if (err)
 302                 kfree(ck);
 303
 304         return err;
 305 }
 306
 307 int cfg80211_ibss_wext_siwfreq(struct net_device *dev,
 308                                struct iw_request_info *info,
 309                                struct iw_freq *wextfreq, char *extra)
 310 {
 311         struct wireless_dev *wdev = dev->ieee80211_ptr;
 312         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 313         struct ieee80211_channel *chan = NULL;
 314         int err, freq;
 315
 316         /* call only for ibss! */
 317         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
 318                 return -EINVAL;
 319
 320         if (!rdev->ops->join_ibss)
 321                 return -EOPNOTSUPP;
 322
 323         freq = cfg80211_wext_freq(wextfreq);
 324         if (freq < 0)
 325                 return freq;
 326
 327         if (freq) {
 328                 chan = ieee80211_get_channel(wdev->wiphy, freq);
 329                 if (!chan)
 330                         return -EINVAL;
 331                 if (chan->flags & IEEE80211_CHAN_NO_IR ||
 332                     chan->flags & IEEE80211_CHAN_DISABLED)
 333                         return -EINVAL;
 334         }
 335
 336         if (wdev->wext.ibss.chandef.chan == chan)
 337                 return 0;
 338
 339         wdev_lock(wdev);
 340         err = 0;
 341         if (wdev->u.ibss.ssid_len)
 342                 err = __cfg80211_leave_ibss(rdev, dev, true);
 343         wdev_unlock(wdev);
 344
 345         if (err)
 346                 return err;
 347
 348         if (chan) {
 349                 cfg80211_chandef_create(&wdev->wext.ibss.chandef, chan,
 350                                         NL80211_CHAN_NO_HT);
 351                 wdev->wext.ibss.channel_fixed = true;
 352         } else {
 353                 /* cfg80211_ibss_wext_join will pick one if needed */
 354                 wdev->wext.ibss.channel_fixed = false;
 355         }
 356
 357         wdev_lock(wdev);
 358         err = cfg80211_ibss_wext_join(rdev, wdev);
 359         wdev_unlock(wdev);
 360
 361         return err;
 362 }
 363
 364 int cfg80211_ibss_wext_giwfreq(struct net_device *dev,
 365                                struct iw_request_info *info,
 366                                struct iw_freq *freq, char *extra)
 367 {
 368         struct wireless_dev *wdev = dev->ieee80211_ptr;
 369         struct ieee80211_channel *chan = NULL;
 370
 371         /* call only for ibss! */
 372         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
 373                 return -EINVAL;
 374
 375         wdev_lock(wdev);
 376         if (wdev->u.ibss.current_bss)
 377                 chan = wdev->u.ibss.current_bss->pub.channel;
 378         else if (wdev->wext.ibss.chandef.chan)
 379                 chan = wdev->wext.ibss.chandef.chan;
 380         wdev_unlock(wdev);
 381
 382         if (chan) {
 383                 freq->m = chan->center_freq;
 384                 freq->e = 6;
 385                 return 0;
 386         }
 387
 388         /* no channel if not joining */
 389         return -EINVAL;
 390 }
 391
 392 int cfg80211_ibss_wext_siwessid(struct net_device *dev,
 393                                 struct iw_request_info *info,
 394                                 struct iw_point *data, char *ssid)
 395 {
 396         struct wireless_dev *wdev = dev->ieee80211_ptr;
 397         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 398         size_t len = data->length;
 399         int err;
 400
 401         /* call only for ibss! */
 402         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
 403                 return -EINVAL;
 404
 405         if (!rdev->ops->join_ibss)
 406                 return -EOPNOTSUPP;
 407
 408         wdev_lock(wdev);
 409         err = 0;
 410         if (wdev->u.ibss.ssid_len)
 411                 err = __cfg80211_leave_ibss(rdev, dev, true);
 412         wdev_unlock(wdev);
 413
 414         if (err)
 415                 return err;
 416
 417         /* iwconfig uses nul termination in SSID.. */
 418         if (len > 0 && ssid[len - 1] == '\0')
 419                 len--;
 420
 421         memcpy(wdev->u.ibss.ssid, ssid, len);
 422         wdev->wext.ibss.ssid = wdev->u.ibss.ssid;
 423         wdev->wext.ibss.ssid_len = len;
 424
 425         wdev_lock(wdev);
 426         err = cfg80211_ibss_wext_join(rdev, wdev);
 427         wdev_unlock(wdev);
 428
 429         return err;
 430 }
 431
 432 int cfg80211_ibss_wext_giwessid(struct net_device *dev,
 433                                 struct iw_request_info *info,
 434                                 struct iw_point *data, char *ssid)
 435 {
 436         struct wireless_dev *wdev = dev->ieee80211_ptr;
 437
 438         /* call only for ibss! */
 439         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
 440                 return -EINVAL;
 441
 442         data->flags = 0;
 443
 444         wdev_lock(wdev);
 445         if (wdev->u.ibss.ssid_len) {
 446                 data->flags = 1;
 447                 data->length = wdev->u.ibss.ssid_len;
 448                 memcpy(ssid, wdev->u.ibss.ssid, data->length);
 449         } else if (wdev->wext.ibss.ssid && wdev->wext.ibss.ssid_len) {
 450                 data->flags = 1;
 451                 data->length = wdev->wext.ibss.ssid_len;
 452                 memcpy(ssid, wdev->wext.ibss.ssid, data->length);
 453         }
 454         wdev_unlock(wdev);
 455
 456         return 0;
 457 }
 458
 459 int cfg80211_ibss_wext_siwap(struct net_device *dev,
 460                              struct iw_request_info *info,
 461                              struct sockaddr *ap_addr, char *extra)
 462 {
 463         struct wireless_dev *wdev = dev->ieee80211_ptr;
 464         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 465         u8 *bssid = ap_addr->sa_data;
 466         int err;
 467
 468         /* call only for ibss! */
 469         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
 470                 return -EINVAL;
 471
 472         if (!rdev->ops->join_ibss)
 473                 return -EOPNOTSUPP;
 474
 475         if (ap_addr->sa_family != ARPHRD_ETHER)
 476                 return -EINVAL;
 477
 478         /* automatic mode */
 479         if (is_zero_ether_addr(bssid) || is_broadcast_ether_addr(bssid))
 480                 bssid = NULL;
 481
 482         if (bssid && !is_valid_ether_addr(bssid))
 483                 return -EINVAL;
 484
 485         /* both automatic */
 486         if (!bssid && !wdev->wext.ibss.bssid)
 487                 return 0;
 488
 489         /* fixed already - and no change */
 490         if (wdev->wext.ibss.bssid && bssid &&
 491             ether_addr_equal(bssid, wdev->wext.ibss.bssid))
 492                 return 0;
 493
 494         wdev_lock(wdev);
 495         err = 0;
 496         if (wdev->u.ibss.ssid_len)
 497                 err = __cfg80211_leave_ibss(rdev, dev, true);
 498         wdev_unlock(wdev);
 499
 500         if (err)
 501                 return err;
 502
 503         if (bssid) {
 504                 memcpy(wdev->wext.bssid, bssid, ETH_ALEN);
 505                 wdev->wext.ibss.bssid = wdev->wext.bssid;
 506         } else
 507                 wdev->wext.ibss.bssid = NULL;
 508
 509         wdev_lock(wdev);
 510         err = cfg80211_ibss_wext_join(rdev, wdev);
 511         wdev_unlock(wdev);
 512
 513         return err;
 514 }
 515
 516 int cfg80211_ibss_wext_giwap(struct net_device *dev,
 517                              struct iw_request_info *info,
 518                              struct sockaddr *ap_addr, char *extra)
 519 {
 520         struct wireless_dev *wdev = dev->ieee80211_ptr;
 521
 522         /* call only for ibss! */
 523         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
 524                 return -EINVAL;
 525
 526         ap_addr->sa_family = ARPHRD_ETHER;
 527
 528         wdev_lock(wdev);
 529         if (wdev->u.ibss.current_bss)
 530                 memcpy(ap_addr->sa_data, wdev->u.ibss.current_bss->pub.bssid,
 531                        ETH_ALEN);
 532         else if (wdev->wext.ibss.bssid)
 533                 memcpy(ap_addr->sa_data, wdev->wext.ibss.bssid, ETH_ALEN);
 534         else
 535                 eth_zero_addr(ap_addr->sa_data);
 536
 537         wdev_unlock(wdev);
 538
 539         return 0;
 540 }
 541 #endif