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 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->u.ibss.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->u.ibss.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->u.ibss.ssid, params->ssid, params->ssid_len); 150 wdev->u.ibss.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, -1, i, false, NULL); 175 176 if (wdev->u.ibss.current_bss) { 177 cfg80211_unhold_bss(wdev->u.ibss.current_bss); 178 cfg80211_put_bss(wdev->wiphy, &wdev->u.ibss.current_bss->pub); 179 } 180 181 wdev->u.ibss.current_bss = NULL; 182 wdev->u.ibss.ssid_len = 0; 183 memset(&wdev->u.ibss.chandef, 0, sizeof(wdev->u.ibss.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->u.ibss.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->u.ibss.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->u.ibss.current_bss) 378 chan = wdev->u.ibss.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->u.ibss.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->u.ibss.ssid, ssid, len); 423 wdev->wext.ibss.ssid = wdev->u.ibss.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->u.ibss.ssid_len) { 447 data->flags = 1; 448 data->length = wdev->u.ibss.ssid_len; 449 memcpy(ssid, wdev->u.ibss.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->u.ibss.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->u.ibss.current_bss) 531 memcpy(ap_addr->sa_data, wdev->u.ibss.current_bss->pub.bssid, 532 ETH_ALEN); 533 else if (wdev->wext.ibss.bssid) 534 memcpy(ap_addr->sa_data, wdev->wext.ibss.bssid, ETH_ALEN); 535 else 536 eth_zero_addr(ap_addr->sa_data); 537 538 wdev_unlock(wdev); 539 540 return 0; 541 } 542 #endif 543