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) 2020-2026 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, struct cfg80211_bss *bss) 20 { 21 struct wireless_dev *wdev = dev->ieee80211_ptr; 22 #ifdef CONFIG_CFG80211_WEXT 23 union iwreq_data wrqu; 24 #endif 25 26 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC)) 27 goto put_bss; 28 29 if (!wdev->u.ibss.ssid_len) 30 goto put_bss; 31 32 if (wdev->u.ibss.current_bss) { 33 cfg80211_unhold_bss(wdev->u.ibss.current_bss); 34 cfg80211_put_bss(wdev->wiphy, &wdev->u.ibss.current_bss->pub); 35 } 36 37 cfg80211_hold_bss(bss_from_pub(bss)); 38 /* the reference from the event is transferred to current_bss */ 39 wdev->u.ibss.current_bss = bss_from_pub(bss); 40 41 cfg80211_upload_connect_keys(wdev); 42 43 nl80211_send_ibss_bssid(wiphy_to_rdev(wdev->wiphy), dev, bss->bssid, 44 GFP_KERNEL); 45 #ifdef CONFIG_CFG80211_WEXT 46 memset(&wrqu, 0, sizeof(wrqu)); 47 memcpy(wrqu.ap_addr.sa_data, bss->bssid, ETH_ALEN); 48 wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL); 49 #endif 50 return; 51 52 put_bss: 53 cfg80211_put_bss(wdev->wiphy, bss); 54 } 55 56 void cfg80211_ibss_joined(struct net_device *dev, const u8 *bssid, 57 struct ieee80211_channel *channel, gfp_t gfp) 58 { 59 struct wireless_dev *wdev = dev->ieee80211_ptr; 60 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy); 61 struct cfg80211_event *ev; 62 struct cfg80211_bss *bss; 63 unsigned long flags; 64 65 trace_cfg80211_ibss_joined(dev, bssid, channel); 66 67 if (WARN_ON(!channel)) 68 return; 69 70 bss = cfg80211_get_bss(wdev->wiphy, channel, bssid, NULL, 0, 71 IEEE80211_BSS_TYPE_IBSS, IEEE80211_PRIVACY_ANY); 72 if (WARN_ON(!bss)) 73 return; 74 75 ev = kzalloc_obj(*ev, gfp); 76 if (!ev) { 77 cfg80211_put_bss(wdev->wiphy, bss); 78 return; 79 } 80 81 ev->type = EVENT_IBSS_JOINED; 82 ev->ij.bss = bss; 83 84 spin_lock_irqsave(&wdev->event_lock, flags); 85 list_add_tail(&ev->list, &wdev->event_list); 86 spin_unlock_irqrestore(&wdev->event_lock, flags); 87 queue_work(cfg80211_wq, &rdev->event_work); 88 } 89 EXPORT_SYMBOL(cfg80211_ibss_joined); 90 91 int __cfg80211_join_ibss(struct cfg80211_registered_device *rdev, 92 struct net_device *dev, 93 struct cfg80211_ibss_params *params, 94 struct cfg80211_cached_keys *connkeys) 95 { 96 struct wireless_dev *wdev = dev->ieee80211_ptr; 97 int err; 98 99 lockdep_assert_held(&rdev->wiphy.mtx); 100 101 if (wdev->links[0].cac_started) 102 return -EBUSY; 103 104 if (wdev->u.ibss.ssid_len) 105 return -EALREADY; 106 107 if (!params->basic_rates) { 108 /* 109 * If no rates were explicitly configured, 110 * use the mandatory rate set for 11b or 111 * 11a for maximum compatibility. 112 */ 113 struct ieee80211_supported_band *sband; 114 enum nl80211_band band; 115 u32 flag; 116 int j; 117 118 band = params->chandef.chan->band; 119 if (band == NL80211_BAND_5GHZ || 120 band == NL80211_BAND_6GHZ) 121 flag = IEEE80211_RATE_MANDATORY_A; 122 else 123 flag = IEEE80211_RATE_MANDATORY_B; 124 125 sband = rdev->wiphy.bands[band]; 126 for (j = 0; j < sband->n_bitrates; j++) { 127 if (sband->bitrates[j].flags & flag) 128 params->basic_rates |= BIT(j); 129 } 130 } 131 132 if (WARN_ON(connkeys && connkeys->def < 0)) 133 return -EINVAL; 134 135 if (WARN_ON(wdev->connect_keys)) 136 kfree_sensitive(wdev->connect_keys); 137 wdev->connect_keys = connkeys; 138 139 wdev->u.ibss.chandef = params->chandef; 140 if (connkeys) { 141 params->wep_keys = connkeys->params; 142 params->wep_tx_key = connkeys->def; 143 } 144 145 #ifdef CONFIG_CFG80211_WEXT 146 wdev->wext.ibss.chandef = params->chandef; 147 #endif 148 err = rdev_join_ibss(rdev, dev, params); 149 if (err) { 150 wdev->connect_keys = NULL; 151 return err; 152 } 153 154 memcpy(wdev->u.ibss.ssid, params->ssid, params->ssid_len); 155 wdev->u.ibss.ssid_len = params->ssid_len; 156 157 return 0; 158 } 159 160 void cfg80211_clear_ibss(struct net_device *dev, bool nowext) 161 { 162 struct wireless_dev *wdev = dev->ieee80211_ptr; 163 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy); 164 int i; 165 166 lockdep_assert_wiphy(wdev->wiphy); 167 168 kfree_sensitive(wdev->connect_keys); 169 wdev->connect_keys = NULL; 170 171 rdev_set_qos_map(rdev, dev, NULL); 172 173 /* 174 * Delete all the keys ... pairwise keys can't really 175 * exist any more anyway, but default keys might. 176 */ 177 if (rdev->ops->del_key) 178 for (i = 0; i < 6; i++) 179 rdev_del_key(rdev, wdev, -1, i, false, NULL); 180 181 if (wdev->u.ibss.current_bss) { 182 cfg80211_unhold_bss(wdev->u.ibss.current_bss); 183 cfg80211_put_bss(wdev->wiphy, &wdev->u.ibss.current_bss->pub); 184 } 185 186 wdev->u.ibss.current_bss = NULL; 187 wdev->u.ibss.ssid_len = 0; 188 memset(&wdev->u.ibss.chandef, 0, sizeof(wdev->u.ibss.chandef)); 189 #ifdef CONFIG_CFG80211_WEXT 190 if (!nowext) 191 wdev->wext.ibss.ssid_len = 0; 192 #endif 193 cfg80211_sched_dfs_chan_update(rdev); 194 } 195 196 int cfg80211_leave_ibss(struct cfg80211_registered_device *rdev, 197 struct net_device *dev, bool nowext) 198 { 199 struct wireless_dev *wdev = dev->ieee80211_ptr; 200 int err; 201 202 lockdep_assert_wiphy(wdev->wiphy); 203 204 if (!wdev->u.ibss.ssid_len) 205 return -ENOLINK; 206 207 err = rdev_leave_ibss(rdev, dev); 208 209 if (err) 210 return err; 211 212 wdev->conn_owner_nlportid = 0; 213 cfg80211_clear_ibss(dev, nowext); 214 215 return 0; 216 } 217 218 #ifdef CONFIG_CFG80211_WEXT 219 int cfg80211_ibss_wext_join(struct cfg80211_registered_device *rdev, 220 struct wireless_dev *wdev) 221 { 222 struct cfg80211_cached_keys *ck = NULL; 223 enum nl80211_band band; 224 int i, err; 225 226 lockdep_assert_wiphy(wdev->wiphy); 227 228 if (!wdev->wext.ibss.beacon_interval) 229 wdev->wext.ibss.beacon_interval = 100; 230 231 /* try to find an IBSS channel if none requested ... */ 232 if (!wdev->wext.ibss.chandef.chan) { 233 struct ieee80211_channel *new_chan = NULL; 234 235 for (band = 0; band < NUM_NL80211_BANDS; band++) { 236 struct ieee80211_supported_band *sband; 237 struct ieee80211_channel *chan; 238 239 sband = rdev->wiphy.bands[band]; 240 if (!sband) 241 continue; 242 243 for (i = 0; i < sband->n_channels; i++) { 244 chan = &sband->channels[i]; 245 if (chan->flags & IEEE80211_CHAN_NO_IR) 246 continue; 247 if (chan->flags & IEEE80211_CHAN_DISABLED) 248 continue; 249 new_chan = chan; 250 break; 251 } 252 253 if (new_chan) 254 break; 255 } 256 257 if (!new_chan) 258 return -EINVAL; 259 260 cfg80211_chandef_create(&wdev->wext.ibss.chandef, new_chan, 261 NL80211_CHAN_NO_HT); 262 } 263 264 /* don't join -- SSID is not there */ 265 if (!wdev->wext.ibss.ssid_len) 266 return 0; 267 268 if (!netif_running(wdev->netdev)) 269 return 0; 270 271 if (wdev->wext.keys) 272 wdev->wext.keys->def = wdev->wext.default_key; 273 274 wdev->wext.ibss.privacy = wdev->wext.default_key != -1; 275 276 if (wdev->wext.keys && wdev->wext.keys->def != -1) { 277 ck = kmemdup(wdev->wext.keys, sizeof(*ck), GFP_KERNEL); 278 if (!ck) 279 return -ENOMEM; 280 for (i = 0; i < 4; i++) 281 ck->params[i].key = ck->data[i]; 282 } 283 err = __cfg80211_join_ibss(rdev, wdev->netdev, 284 &wdev->wext.ibss, ck); 285 if (err) 286 kfree(ck); 287 288 return err; 289 } 290 291 int cfg80211_ibss_wext_siwfreq(struct net_device *dev, 292 struct iw_request_info *info, 293 struct iw_freq *wextfreq, char *extra) 294 { 295 struct wireless_dev *wdev = dev->ieee80211_ptr; 296 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy); 297 struct ieee80211_channel *chan = NULL; 298 int err, freq; 299 300 /* call only for ibss! */ 301 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC)) 302 return -EINVAL; 303 304 if (!rdev->ops->join_ibss) 305 return -EOPNOTSUPP; 306 307 freq = cfg80211_wext_freq(wextfreq); 308 if (freq < 0) 309 return freq; 310 311 if (freq) { 312 chan = ieee80211_get_channel(wdev->wiphy, freq); 313 if (!chan) 314 return -EINVAL; 315 if (chan->flags & IEEE80211_CHAN_NO_IR || 316 chan->flags & IEEE80211_CHAN_DISABLED) 317 return -EINVAL; 318 } 319 320 if (wdev->wext.ibss.chandef.chan == chan) 321 return 0; 322 323 err = 0; 324 if (wdev->u.ibss.ssid_len) 325 err = cfg80211_leave_ibss(rdev, dev, true); 326 327 if (err) 328 return err; 329 330 if (chan) { 331 cfg80211_chandef_create(&wdev->wext.ibss.chandef, chan, 332 NL80211_CHAN_NO_HT); 333 wdev->wext.ibss.channel_fixed = true; 334 } else { 335 /* cfg80211_ibss_wext_join will pick one if needed */ 336 wdev->wext.ibss.channel_fixed = false; 337 } 338 339 return cfg80211_ibss_wext_join(rdev, wdev); 340 } 341 342 int cfg80211_ibss_wext_giwfreq(struct net_device *dev, 343 struct iw_request_info *info, 344 struct iw_freq *freq, char *extra) 345 { 346 struct wireless_dev *wdev = dev->ieee80211_ptr; 347 struct ieee80211_channel *chan = NULL; 348 349 /* call only for ibss! */ 350 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC)) 351 return -EINVAL; 352 353 if (wdev->u.ibss.current_bss) 354 chan = wdev->u.ibss.current_bss->pub.channel; 355 else if (wdev->wext.ibss.chandef.chan) 356 chan = wdev->wext.ibss.chandef.chan; 357 358 if (chan) { 359 freq->m = chan->center_freq; 360 freq->e = 6; 361 return 0; 362 } 363 364 /* no channel if not joining */ 365 return -EINVAL; 366 } 367 368 int cfg80211_ibss_wext_siwessid(struct net_device *dev, 369 struct iw_request_info *info, 370 struct iw_point *data, char *ssid) 371 { 372 struct wireless_dev *wdev = dev->ieee80211_ptr; 373 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy); 374 size_t len = data->length; 375 int err; 376 377 /* call only for ibss! */ 378 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC)) 379 return -EINVAL; 380 381 if (!rdev->ops->join_ibss) 382 return -EOPNOTSUPP; 383 384 err = 0; 385 if (wdev->u.ibss.ssid_len) 386 err = cfg80211_leave_ibss(rdev, dev, true); 387 388 if (err) 389 return err; 390 391 /* iwconfig uses nul termination in SSID.. */ 392 if (len > 0 && ssid[len - 1] == '\0') 393 len--; 394 395 memcpy(wdev->u.ibss.ssid, ssid, len); 396 wdev->wext.ibss.ssid = wdev->u.ibss.ssid; 397 wdev->wext.ibss.ssid_len = len; 398 399 return cfg80211_ibss_wext_join(rdev, wdev); 400 } 401 402 int cfg80211_ibss_wext_giwessid(struct net_device *dev, 403 struct iw_request_info *info, 404 struct iw_point *data, char *ssid) 405 { 406 struct wireless_dev *wdev = dev->ieee80211_ptr; 407 408 /* call only for ibss! */ 409 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC)) 410 return -EINVAL; 411 412 data->flags = 0; 413 414 if (wdev->u.ibss.ssid_len) { 415 data->flags = 1; 416 data->length = wdev->u.ibss.ssid_len; 417 memcpy(ssid, wdev->u.ibss.ssid, data->length); 418 } else if (wdev->wext.ibss.ssid && wdev->wext.ibss.ssid_len) { 419 data->flags = 1; 420 data->length = wdev->wext.ibss.ssid_len; 421 memcpy(ssid, wdev->wext.ibss.ssid, data->length); 422 } 423 424 return 0; 425 } 426 427 int cfg80211_ibss_wext_siwap(struct net_device *dev, 428 struct iw_request_info *info, 429 struct sockaddr *ap_addr, char *extra) 430 { 431 struct wireless_dev *wdev = dev->ieee80211_ptr; 432 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy); 433 u8 *bssid = ap_addr->sa_data; 434 int err; 435 436 /* call only for ibss! */ 437 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC)) 438 return -EINVAL; 439 440 if (!rdev->ops->join_ibss) 441 return -EOPNOTSUPP; 442 443 if (ap_addr->sa_family != ARPHRD_ETHER) 444 return -EINVAL; 445 446 /* automatic mode */ 447 if (is_zero_ether_addr(bssid) || is_broadcast_ether_addr(bssid)) 448 bssid = NULL; 449 450 if (bssid && !is_valid_ether_addr(bssid)) 451 return -EINVAL; 452 453 /* both automatic */ 454 if (!bssid && !wdev->wext.ibss.bssid) 455 return 0; 456 457 /* fixed already - and no change */ 458 if (wdev->wext.ibss.bssid && bssid && 459 ether_addr_equal(bssid, wdev->wext.ibss.bssid)) 460 return 0; 461 462 err = 0; 463 if (wdev->u.ibss.ssid_len) 464 err = cfg80211_leave_ibss(rdev, dev, true); 465 466 if (err) 467 return err; 468 469 if (bssid) { 470 memcpy(wdev->wext.bssid, bssid, ETH_ALEN); 471 wdev->wext.ibss.bssid = wdev->wext.bssid; 472 } else 473 wdev->wext.ibss.bssid = NULL; 474 475 return cfg80211_ibss_wext_join(rdev, wdev); 476 } 477 478 int cfg80211_ibss_wext_giwap(struct net_device *dev, 479 struct iw_request_info *info, 480 struct sockaddr *ap_addr, char *extra) 481 { 482 struct wireless_dev *wdev = dev->ieee80211_ptr; 483 484 /* call only for ibss! */ 485 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC)) 486 return -EINVAL; 487 488 ap_addr->sa_family = ARPHRD_ETHER; 489 490 if (wdev->u.ibss.current_bss) 491 memcpy(ap_addr->sa_data, wdev->u.ibss.current_bss->pub.bssid, 492 ETH_ALEN); 493 else if (wdev->wext.ibss.bssid) 494 memcpy(ap_addr->sa_data, wdev->wext.ibss.bssid, ETH_ALEN); 495 else 496 eth_zero_addr(ap_addr->sa_data); 497 498 return 0; 499 } 500 #endif 501