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->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->current_bss) {
  41                 cfg80211_unhold_bss(wdev->current_bss);
  42                 cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
  43         }
  44
  45         cfg80211_hold_bss(bss_from_pub(bss));
  46         wdev->current_bss = bss_from_pub(bss);
  47
  48         if (!(wdev->wiphy->flags & WIPHY_FLAG_HAS_STATIC_WEP))
  49                 cfg80211_upload_connect_keys(wdev);
  50
  51         nl80211_send_ibss_bssid(wiphy_to_rdev(wdev->wiphy), dev, bssid,
  52                                 GFP_KERNEL);
  53 #ifdef CONFIG_CFG80211_WEXT
  54         memset(&wrqu, 0, sizeof(wrqu));
  55         memcpy(wrqu.ap_addr.sa_data, bssid, ETH_ALEN);
  56         wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL);
  57 #endif
  58 }
  59
  60 void cfg80211_ibss_joined(struct net_device *dev, const u8 *bssid,
  61                           struct ieee80211_channel *channel, gfp_t gfp)
  62 {
  63         struct wireless_dev *wdev = dev->ieee80211_ptr;
  64         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
  65         struct cfg80211_event *ev;
  66         unsigned long flags;
  67
  68         trace_cfg80211_ibss_joined(dev, bssid, channel);
  69
  70         if (WARN_ON(!channel))
  71                 return;
  72
  73         ev = kzalloc(sizeof(*ev), gfp);
  74         if (!ev)
  75                 return;
  76
  77         ev->type = EVENT_IBSS_JOINED;
  78         memcpy(ev->ij.bssid, bssid, ETH_ALEN);
  79         ev->ij.channel = channel;
  80
  81         spin_lock_irqsave(&wdev->event_lock, flags);
  82         list_add_tail(&ev->list, &wdev->event_list);
  83         spin_unlock_irqrestore(&wdev->event_lock, flags);
  84         queue_work(cfg80211_wq, &rdev->event_work);
  85 }
  86 EXPORT_SYMBOL(cfg80211_ibss_joined);
  87
  88 int __cfg80211_join_ibss(struct cfg80211_registered_device *rdev,
  89                          struct net_device *dev,
  90                          struct cfg80211_ibss_params *params,
  91                          struct cfg80211_cached_keys *connkeys)
  92 {
  93         struct wireless_dev *wdev = dev->ieee80211_ptr;
  94         int err;
  95
  96         lockdep_assert_held(&rdev->wiphy.mtx);
  97         ASSERT_WDEV_LOCK(wdev);
  98
  99         if (wdev->ssid_len)
 100                 return -EALREADY;
 101
 102         if (!params->basic_rates) {
 103                 /*
 104                 * If no rates were explicitly configured,
 105                 * use the mandatory rate set for 11b or
 106                 * 11a for maximum compatibility.
 107                 */
 108                 struct ieee80211_supported_band *sband;
 109                 enum nl80211_band band;
 110                 u32 flag;
 111                 int j;
 112
 113                 band = params->chandef.chan->band;
 114                 if (band == NL80211_BAND_5GHZ ||
 115                     band == NL80211_BAND_6GHZ)
 116                         flag = IEEE80211_RATE_MANDATORY_A;
 117                 else
 118                         flag = IEEE80211_RATE_MANDATORY_B;
 119
 120                 sband = rdev->wiphy.bands[band];
 121                 for (j = 0; j < sband->n_bitrates; j++) {
 122                         if (sband->bitrates[j].flags & flag)
 123                                 params->basic_rates |= BIT(j);
 124                 }
 125         }
 126
 127         if (WARN_ON(connkeys && connkeys->def < 0))
 128                 return -EINVAL;
 129
 130         if (WARN_ON(wdev->connect_keys))
 131                 kfree_sensitive(wdev->connect_keys);
 132         wdev->connect_keys = connkeys;
 133
 134         wdev->chandef = params->chandef;
 135         if (connkeys) {
 136                 params->wep_keys = connkeys->params;
 137                 params->wep_tx_key = connkeys->def;
 138         }
 139
 140 #ifdef CONFIG_CFG80211_WEXT
 141         wdev->wext.ibss.chandef = params->chandef;
 142 #endif
 143         err = rdev_join_ibss(rdev, dev, params);
 144         if (err) {
 145                 wdev->connect_keys = NULL;
 146                 return err;
 147         }
 148
 149         memcpy(wdev->ssid, params->ssid, params->ssid_len);
 150         wdev->ssid_len = params->ssid_len;
 151
 152         return 0;
 153 }
 154
 155 static void __cfg80211_clear_ibss(struct net_device *dev, bool nowext)
 156 {
 157         struct wireless_dev *wdev = dev->ieee80211_ptr;
 158         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 159         int i;
 160
 161         ASSERT_WDEV_LOCK(wdev);
 162
 163         kfree_sensitive(wdev->connect_keys);
 164         wdev->connect_keys = NULL;
 165
 166         rdev_set_qos_map(rdev, dev, NULL);
 167
 168         /*
 169          * Delete all the keys ... pairwise keys can't really
 170          * exist any more anyway, but default keys might.
 171          */
 172         if (rdev->ops->del_key)
 173                 for (i = 0; i < 6; i++)
 174                         rdev_del_key(rdev, dev, i, false, NULL);
 175
 176         if (wdev->current_bss) {
 177                 cfg80211_unhold_bss(wdev->current_bss);
 178                 cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
 179         }
 180
 181         wdev->current_bss = NULL;
 182         wdev->ssid_len = 0;
 183         memset(&wdev->chandef, 0, sizeof(wdev->chandef));
 184 #ifdef CONFIG_CFG80211_WEXT
 185         if (!nowext)
 186                 wdev->wext.ibss.ssid_len = 0;
 187 #endif
 188         cfg80211_sched_dfs_chan_update(rdev);
 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         wdev->conn_owner_nlportid = 0;
 217         __cfg80211_clear_ibss(dev, nowext);
 218
 219         return 0;
 220 }
 221
 222 int cfg80211_leave_ibss(struct cfg80211_registered_device *rdev,
 223                         struct net_device *dev, bool nowext)
 224 {
 225         struct wireless_dev *wdev = dev->ieee80211_ptr;
 226         int err;
 227
 228         wdev_lock(wdev);
 229         err = __cfg80211_leave_ibss(rdev, dev, nowext);
 230         wdev_unlock(wdev);
 231
 232         return err;
 233 }
 234
 235 #ifdef CONFIG_CFG80211_WEXT
 236 int cfg80211_ibss_wext_join(struct cfg80211_registered_device *rdev,
 237                             struct wireless_dev *wdev)
 238 {
 239         struct cfg80211_cached_keys *ck = NULL;
 240         enum nl80211_band band;
 241         int i, err;
 242
 243         ASSERT_WDEV_LOCK(wdev);
 244
 245         if (!wdev->wext.ibss.beacon_interval)
 246                 wdev->wext.ibss.beacon_interval = 100;
 247
 248         /* try to find an IBSS channel if none requested ... */
 249         if (!wdev->wext.ibss.chandef.chan) {
 250                 struct ieee80211_channel *new_chan = NULL;
 251
 252                 for (band = 0; band < NUM_NL80211_BANDS; band++) {
 253                         struct ieee80211_supported_band *sband;
 254                         struct ieee80211_channel *chan;
 255
 256                         sband = rdev->wiphy.bands[band];
 257                         if (!sband)
 258                                 continue;
 259
 260                         for (i = 0; i < sband->n_channels; i++) {
 261                                 chan = &sband->channels[i];
 262                                 if (chan->flags & IEEE80211_CHAN_NO_IR)
 263                                         continue;
 264                                 if (chan->flags & IEEE80211_CHAN_DISABLED)
 265                                         continue;
 266                                 new_chan = chan;
 267                                 break;
 268                         }
 269
 270                         if (new_chan)
 271                                 break;
 272                 }
 273
 274                 if (!new_chan)
 275                         return -EINVAL;
 276
 277                 cfg80211_chandef_create(&wdev->wext.ibss.chandef, new_chan,
 278                                         NL80211_CHAN_NO_HT);
 279         }
 280
 281         /* don't join -- SSID is not there */
 282         if (!wdev->wext.ibss.ssid_len)
 283                 return 0;
 284
 285         if (!netif_running(wdev->netdev))
 286                 return 0;
 287
 288         if (wdev->wext.keys)
 289                 wdev->wext.keys->def = wdev->wext.default_key;
 290
 291         wdev->wext.ibss.privacy = wdev->wext.default_key != -1;
 292
 293         if (wdev->wext.keys && wdev->wext.keys->def != -1) {
 294                 ck = kmemdup(wdev->wext.keys, sizeof(*ck), GFP_KERNEL);
 295                 if (!ck)
 296                         return -ENOMEM;
 297                 for (i = 0; i < CFG80211_MAX_WEP_KEYS; i++)
 298                         ck->params[i].key = ck->data[i];
 299         }
 300         err = __cfg80211_join_ibss(rdev, wdev->netdev,
 301                                    &wdev->wext.ibss, ck);
 302         if (err)
 303                 kfree(ck);
 304
 305         return err;
 306 }
 307
 308 int cfg80211_ibss_wext_siwfreq(struct net_device *dev,
 309                                struct iw_request_info *info,
 310                                struct iw_freq *wextfreq, char *extra)
 311 {
 312         struct wireless_dev *wdev = dev->ieee80211_ptr;
 313         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 314         struct ieee80211_channel *chan = NULL;
 315         int err, freq;
 316
 317         /* call only for ibss! */
 318         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
 319                 return -EINVAL;
 320
 321         if (!rdev->ops->join_ibss)
 322                 return -EOPNOTSUPP;
 323
 324         freq = cfg80211_wext_freq(wextfreq);
 325         if (freq < 0)
 326                 return freq;
 327
 328         if (freq) {
 329                 chan = ieee80211_get_channel(wdev->wiphy, freq);
 330                 if (!chan)
 331                         return -EINVAL;
 332                 if (chan->flags & IEEE80211_CHAN_NO_IR ||
 333                     chan->flags & IEEE80211_CHAN_DISABLED)
 334                         return -EINVAL;
 335         }
 336
 337         if (wdev->wext.ibss.chandef.chan == chan)
 338                 return 0;
 339
 340         wdev_lock(wdev);
 341         err = 0;
 342         if (wdev->ssid_len)
 343                 err = __cfg80211_leave_ibss(rdev, dev, true);
 344         wdev_unlock(wdev);
 345
 346         if (err)
 347                 return err;
 348
 349         if (chan) {
 350                 cfg80211_chandef_create(&wdev->wext.ibss.chandef, chan,
 351                                         NL80211_CHAN_NO_HT);
 352                 wdev->wext.ibss.channel_fixed = true;
 353         } else {
 354                 /* cfg80211_ibss_wext_join will pick one if needed */
 355                 wdev->wext.ibss.channel_fixed = false;
 356         }
 357
 358         wdev_lock(wdev);
 359         err = cfg80211_ibss_wext_join(rdev, wdev);
 360         wdev_unlock(wdev);
 361
 362         return err;
 363 }
 364
 365 int cfg80211_ibss_wext_giwfreq(struct net_device *dev,
 366                                struct iw_request_info *info,
 367                                struct iw_freq *freq, char *extra)
 368 {
 369         struct wireless_dev *wdev = dev->ieee80211_ptr;
 370         struct ieee80211_channel *chan = NULL;
 371
 372         /* call only for ibss! */
 373         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
 374                 return -EINVAL;
 375
 376         wdev_lock(wdev);
 377         if (wdev->current_bss)
 378                 chan = wdev->current_bss->pub.channel;
 379         else if (wdev->wext.ibss.chandef.chan)
 380                 chan = wdev->wext.ibss.chandef.chan;
 381         wdev_unlock(wdev);
 382
 383         if (chan) {
 384                 freq->m = chan->center_freq;
 385                 freq->e = 6;
 386                 return 0;
 387         }
 388
 389         /* no channel if not joining */
 390         return -EINVAL;
 391 }
 392
 393 int cfg80211_ibss_wext_siwessid(struct net_device *dev,
 394                                 struct iw_request_info *info,
 395                                 struct iw_point *data, char *ssid)
 396 {
 397         struct wireless_dev *wdev = dev->ieee80211_ptr;
 398         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 399         size_t len = data->length;
 400         int err;
 401
 402         /* call only for ibss! */
 403         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
 404                 return -EINVAL;
 405
 406         if (!rdev->ops->join_ibss)
 407                 return -EOPNOTSUPP;
 408
 409         wdev_lock(wdev);
 410         err = 0;
 411         if (wdev->ssid_len)
 412                 err = __cfg80211_leave_ibss(rdev, dev, true);
 413         wdev_unlock(wdev);
 414
 415         if (err)
 416                 return err;
 417
 418         /* iwconfig uses nul termination in SSID.. */
 419         if (len > 0 && ssid[len - 1] == '\0')
 420                 len--;
 421
 422         memcpy(wdev->ssid, ssid, len);
 423         wdev->wext.ibss.ssid = wdev->ssid;
 424         wdev->wext.ibss.ssid_len = len;
 425
 426         wdev_lock(wdev);
 427         err = cfg80211_ibss_wext_join(rdev, wdev);
 428         wdev_unlock(wdev);
 429
 430         return err;
 431 }
 432
 433 int cfg80211_ibss_wext_giwessid(struct net_device *dev,
 434                                 struct iw_request_info *info,
 435                                 struct iw_point *data, char *ssid)
 436 {
 437         struct wireless_dev *wdev = dev->ieee80211_ptr;
 438
 439         /* call only for ibss! */
 440         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
 441                 return -EINVAL;
 442
 443         data->flags = 0;
 444
 445         wdev_lock(wdev);
 446         if (wdev->ssid_len) {
 447                 data->flags = 1;
 448                 data->length = wdev->ssid_len;
 449                 memcpy(ssid, wdev->ssid, data->length);
 450         } else if (wdev->wext.ibss.ssid && wdev->wext.ibss.ssid_len) {
 451                 data->flags = 1;
 452                 data->length = wdev->wext.ibss.ssid_len;
 453                 memcpy(ssid, wdev->wext.ibss.ssid, data->length);
 454         }
 455         wdev_unlock(wdev);
 456
 457         return 0;
 458 }
 459
 460 int cfg80211_ibss_wext_siwap(struct net_device *dev,
 461                              struct iw_request_info *info,
 462                              struct sockaddr *ap_addr, char *extra)
 463 {
 464         struct wireless_dev *wdev = dev->ieee80211_ptr;
 465         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 466         u8 *bssid = ap_addr->sa_data;
 467         int err;
 468
 469         /* call only for ibss! */
 470         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
 471                 return -EINVAL;
 472
 473         if (!rdev->ops->join_ibss)
 474                 return -EOPNOTSUPP;
 475
 476         if (ap_addr->sa_family != ARPHRD_ETHER)
 477                 return -EINVAL;
 478
 479         /* automatic mode */
 480         if (is_zero_ether_addr(bssid) || is_broadcast_ether_addr(bssid))
 481                 bssid = NULL;
 482
 483         if (bssid && !is_valid_ether_addr(bssid))
 484                 return -EINVAL;
 485
 486         /* both automatic */
 487         if (!bssid && !wdev->wext.ibss.bssid)
 488                 return 0;
 489
 490         /* fixed already - and no change */
 491         if (wdev->wext.ibss.bssid && bssid &&
 492             ether_addr_equal(bssid, wdev->wext.ibss.bssid))
 493                 return 0;
 494
 495         wdev_lock(wdev);
 496         err = 0;
 497         if (wdev->ssid_len)
 498                 err = __cfg80211_leave_ibss(rdev, dev, true);
 499         wdev_unlock(wdev);
 500
 501         if (err)
 502                 return err;
 503
 504         if (bssid) {
 505                 memcpy(wdev->wext.bssid, bssid, ETH_ALEN);
 506                 wdev->wext.ibss.bssid = wdev->wext.bssid;
 507         } else
 508                 wdev->wext.ibss.bssid = NULL;
 509
 510         wdev_lock(wdev);
 511         err = cfg80211_ibss_wext_join(rdev, wdev);
 512         wdev_unlock(wdev);
 513
 514         return err;
 515 }
 516
 517 int cfg80211_ibss_wext_giwap(struct net_device *dev,
 518                              struct iw_request_info *info,
 519                              struct sockaddr *ap_addr, char *extra)
 520 {
 521         struct wireless_dev *wdev = dev->ieee80211_ptr;
 522
 523         /* call only for ibss! */
 524         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
 525                 return -EINVAL;
 526
 527         ap_addr->sa_family = ARPHRD_ETHER;
 528
 529         wdev_lock(wdev);
 530         if (wdev->current_bss)
 531                 memcpy(ap_addr->sa_data, wdev->current_bss->pub.bssid, 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