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) 2020-2024 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
97 if (wdev->cac_started)
98 return -EBUSY;
99
100 if (wdev->u.ibss.ssid_len)
101 return -EALREADY;
102
103 if (!params->basic_rates) {
104 /*
105 * If no rates were explicitly configured,
106 * use the mandatory rate set for 11b or
107 * 11a for maximum compatibility.
108 */
109 struct ieee80211_supported_band *sband;
110 enum nl80211_band band;
111 u32 flag;
112 int j;
113
114 band = params->chandef.chan->band;
115 if (band == NL80211_BAND_5GHZ ||
116 band == NL80211_BAND_6GHZ)
117 flag = IEEE80211_RATE_MANDATORY_A;
118 else
119 flag = IEEE80211_RATE_MANDATORY_B;
120
121 sband = rdev->wiphy.bands[band];
122 for (j = 0; j < sband->n_bitrates; j++) {
123 if (sband->bitrates[j].flags & flag)
124 params->basic_rates |= BIT(j);
125 }
126 }
127
128 if (WARN_ON(connkeys && connkeys->def < 0))
129 return -EINVAL;
130
131 if (WARN_ON(wdev->connect_keys))
132 kfree_sensitive(wdev->connect_keys);
133 wdev->connect_keys = connkeys;
134
135 wdev->u.ibss.chandef = params->chandef;
136 if (connkeys) {
137 params->wep_keys = connkeys->params;
138 params->wep_tx_key = connkeys->def;
139 }
140
141 #ifdef CONFIG_CFG80211_WEXT
142 wdev->wext.ibss.chandef = params->chandef;
143 #endif
144 err = rdev_join_ibss(rdev, dev, params);
145 if (err) {
146 wdev->connect_keys = NULL;
147 return err;
148 }
149
150 memcpy(wdev->u.ibss.ssid, params->ssid, params->ssid_len);
151 wdev->u.ibss.ssid_len = params->ssid_len;
152
153 return 0;
154 }
155
156 void cfg80211_clear_ibss(struct net_device *dev, bool nowext)
157 {
158 struct wireless_dev *wdev = dev->ieee80211_ptr;
159 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
160 int i;
161
162 lockdep_assert_wiphy(wdev->wiphy);
163
164 kfree_sensitive(wdev->connect_keys);
165 wdev->connect_keys = NULL;
166
167 rdev_set_qos_map(rdev, dev, NULL);
168
169 /*
170 * Delete all the keys ... pairwise keys can't really
171 * exist any more anyway, but default keys might.
172 */
173 if (rdev->ops->del_key)
174 for (i = 0; i < 6; i++)
175 rdev_del_key(rdev, dev, -1, i, false, NULL);
176
177 if (wdev->u.ibss.current_bss) {
178 cfg80211_unhold_bss(wdev->u.ibss.current_bss);
179 cfg80211_put_bss(wdev->wiphy, &wdev->u.ibss.current_bss->pub);
180 }
181
182 wdev->u.ibss.current_bss = NULL;
183 wdev->u.ibss.ssid_len = 0;
184 memset(&wdev->u.ibss.chandef, 0, sizeof(wdev->u.ibss.chandef));
185 #ifdef CONFIG_CFG80211_WEXT
186 if (!nowext)
187 wdev->wext.ibss.ssid_len = 0;
188 #endif
189 cfg80211_sched_dfs_chan_update(rdev);
190 }
191
192 int cfg80211_leave_ibss(struct cfg80211_registered_device *rdev,
193 struct net_device *dev, bool nowext)
194 {
195 struct wireless_dev *wdev = dev->ieee80211_ptr;
196 int err;
197
198 lockdep_assert_wiphy(wdev->wiphy);
199
200 if (!wdev->u.ibss.ssid_len)
201 return -ENOLINK;
202
203 err = rdev_leave_ibss(rdev, dev);
204
205 if (err)
206 return err;
207
208 wdev->conn_owner_nlportid = 0;
209 cfg80211_clear_ibss(dev, nowext);
210
211 return 0;
212 }
213
214 #ifdef CONFIG_CFG80211_WEXT
215 int cfg80211_ibss_wext_join(struct cfg80211_registered_device *rdev,
216 struct wireless_dev *wdev)
217 {
218 struct cfg80211_cached_keys *ck = NULL;
219 enum nl80211_band band;
220 int i, err;
221
222 lockdep_assert_wiphy(wdev->wiphy);
223
224 if (!wdev->wext.ibss.beacon_interval)
225 wdev->wext.ibss.beacon_interval = 100;
226
227 /* try to find an IBSS channel if none requested ... */
228 if (!wdev->wext.ibss.chandef.chan) {
229 struct ieee80211_channel *new_chan = NULL;
230
231 for (band = 0; band < NUM_NL80211_BANDS; band++) {
232 struct ieee80211_supported_band *sband;
233 struct ieee80211_channel *chan;
234
235 sband = rdev->wiphy.bands[band];
236 if (!sband)
237 continue;
238
239 for (i = 0; i < sband->n_channels; i++) {
240 chan = &sband->channels[i];
241 if (chan->flags & IEEE80211_CHAN_NO_IR)
242 continue;
243 if (chan->flags & IEEE80211_CHAN_DISABLED)
244 continue;
245 new_chan = chan;
246 break;
247 }
248
249 if (new_chan)
250 break;
251 }
252
253 if (!new_chan)
254 return -EINVAL;
255
256 cfg80211_chandef_create(&wdev->wext.ibss.chandef, new_chan,
257 NL80211_CHAN_NO_HT);
258 }
259
260 /* don't join -- SSID is not there */
261 if (!wdev->wext.ibss.ssid_len)
262 return 0;
263
264 if (!netif_running(wdev->netdev))
265 return 0;
266
267 if (wdev->wext.keys)
268 wdev->wext.keys->def = wdev->wext.default_key;
269
270 wdev->wext.ibss.privacy = wdev->wext.default_key != -1;
271
272 if (wdev->wext.keys && wdev->wext.keys->def != -1) {
273 ck = kmemdup(wdev->wext.keys, sizeof(*ck), GFP_KERNEL);
274 if (!ck)
275 return -ENOMEM;
276 for (i = 0; i < 4; i++)
277 ck->params[i].key = ck->data[i];
278 }
279 err = __cfg80211_join_ibss(rdev, wdev->netdev,
280 &wdev->wext.ibss, ck);
281 if (err)
282 kfree(ck);
283
284 return err;
285 }
286
287 int cfg80211_ibss_wext_siwfreq(struct net_device *dev,
288 struct iw_request_info *info,
289 struct iw_freq *wextfreq, char *extra)
290 {
291 struct wireless_dev *wdev = dev->ieee80211_ptr;
292 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
293 struct ieee80211_channel *chan = NULL;
294 int err, freq;
295
296 /* call only for ibss! */
297 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
298 return -EINVAL;
299
300 if (!rdev->ops->join_ibss)
301 return -EOPNOTSUPP;
302
303 freq = cfg80211_wext_freq(wextfreq);
304 if (freq < 0)
305 return freq;
306
307 if (freq) {
308 chan = ieee80211_get_channel(wdev->wiphy, freq);
309 if (!chan)
310 return -EINVAL;
311 if (chan->flags & IEEE80211_CHAN_NO_IR ||
312 chan->flags & IEEE80211_CHAN_DISABLED)
313 return -EINVAL;
314 }
315
316 if (wdev->wext.ibss.chandef.chan == chan)
317 return 0;
318
319 err = 0;
320 if (wdev->u.ibss.ssid_len)
321 err = cfg80211_leave_ibss(rdev, dev, true);
322
323 if (err)
324 return err;
325
326 if (chan) {
327 cfg80211_chandef_create(&wdev->wext.ibss.chandef, chan,
328 NL80211_CHAN_NO_HT);
329 wdev->wext.ibss.channel_fixed = true;
330 } else {
331 /* cfg80211_ibss_wext_join will pick one if needed */
332 wdev->wext.ibss.channel_fixed = false;
333 }
334
335 return cfg80211_ibss_wext_join(rdev, wdev);
336 }
337
338 int cfg80211_ibss_wext_giwfreq(struct net_device *dev,
339 struct iw_request_info *info,
340 struct iw_freq *freq, char *extra)
341 {
342 struct wireless_dev *wdev = dev->ieee80211_ptr;
343 struct ieee80211_channel *chan = NULL;
344
345 /* call only for ibss! */
346 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
347 return -EINVAL;
348
349 if (wdev->u.ibss.current_bss)
350 chan = wdev->u.ibss.current_bss->pub.channel;
351 else if (wdev->wext.ibss.chandef.chan)
352 chan = wdev->wext.ibss.chandef.chan;
353
354 if (chan) {
355 freq->m = chan->center_freq;
356 freq->e = 6;
357 return 0;
358 }
359
360 /* no channel if not joining */
361 return -EINVAL;
362 }
363
364 int cfg80211_ibss_wext_siwessid(struct net_device *dev,
365 struct iw_request_info *info,
366 struct iw_point *data, char *ssid)
367 {
368 struct wireless_dev *wdev = dev->ieee80211_ptr;
369 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
370 size_t len = data->length;
371 int err;
372
373 /* call only for ibss! */
374 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
375 return -EINVAL;
376
377 if (!rdev->ops->join_ibss)
378 return -EOPNOTSUPP;
379
380 err = 0;
381 if (wdev->u.ibss.ssid_len)
382 err = cfg80211_leave_ibss(rdev, dev, true);
383
384 if (err)
385 return err;
386
387 /* iwconfig uses nul termination in SSID.. */
388 if (len > 0 && ssid[len - 1] == '\0')
389 len--;
390
391 memcpy(wdev->u.ibss.ssid, ssid, len);
392 wdev->wext.ibss.ssid = wdev->u.ibss.ssid;
393 wdev->wext.ibss.ssid_len = len;
394
395 return cfg80211_ibss_wext_join(rdev, wdev);
396 }
397
398 int cfg80211_ibss_wext_giwessid(struct net_device *dev,
399 struct iw_request_info *info,
400 struct iw_point *data, char *ssid)
401 {
402 struct wireless_dev *wdev = dev->ieee80211_ptr;
403
404 /* call only for ibss! */
405 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
406 return -EINVAL;
407
408 data->flags = 0;
409
410 if (wdev->u.ibss.ssid_len) {
411 data->flags = 1;
412 data->length = wdev->u.ibss.ssid_len;
413 memcpy(ssid, wdev->u.ibss.ssid, data->length);
414 } else if (wdev->wext.ibss.ssid && wdev->wext.ibss.ssid_len) {
415 data->flags = 1;
416 data->length = wdev->wext.ibss.ssid_len;
417 memcpy(ssid, wdev->wext.ibss.ssid, data->length);
418 }
419
420 return 0;
421 }
422
423 int cfg80211_ibss_wext_siwap(struct net_device *dev,
424 struct iw_request_info *info,
425 struct sockaddr *ap_addr, char *extra)
426 {
427 struct wireless_dev *wdev = dev->ieee80211_ptr;
428 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
429 u8 *bssid = ap_addr->sa_data;
430 int err;
431
432 /* call only for ibss! */
433 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
434 return -EINVAL;
435
436 if (!rdev->ops->join_ibss)
437 return -EOPNOTSUPP;
438
439 if (ap_addr->sa_family != ARPHRD_ETHER)
440 return -EINVAL;
441
442 /* automatic mode */
443 if (is_zero_ether_addr(bssid) || is_broadcast_ether_addr(bssid))
444 bssid = NULL;
445
446 if (bssid && !is_valid_ether_addr(bssid))
447 return -EINVAL;
448
449 /* both automatic */
450 if (!bssid && !wdev->wext.ibss.bssid)
451 return 0;
452
453 /* fixed already - and no change */
454 if (wdev->wext.ibss.bssid && bssid &&
455 ether_addr_equal(bssid, wdev->wext.ibss.bssid))
456 return 0;
457
458 err = 0;
459 if (wdev->u.ibss.ssid_len)
460 err = cfg80211_leave_ibss(rdev, dev, true);
461
462 if (err)
463 return err;
464
465 if (bssid) {
466 memcpy(wdev->wext.bssid, bssid, ETH_ALEN);
467 wdev->wext.ibss.bssid = wdev->wext.bssid;
468 } else
469 wdev->wext.ibss.bssid = NULL;
470
471 return cfg80211_ibss_wext_join(rdev, wdev);
472 }
473
474 int cfg80211_ibss_wext_giwap(struct net_device *dev,
475 struct iw_request_info *info,
476 struct sockaddr *ap_addr, char *extra)
477 {
478 struct wireless_dev *wdev = dev->ieee80211_ptr;
479
480 /* call only for ibss! */
481 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
482 return -EINVAL;
483
484 ap_addr->sa_family = ARPHRD_ETHER;
485
486 if (wdev->u.ibss.current_bss)
487 memcpy(ap_addr->sa_data, wdev->u.ibss.current_bss->pub.bssid,
488 ETH_ALEN);
489 else if (wdev->wext.ibss.bssid)
490 memcpy(ap_addr->sa_data, wdev->wext.ibss.bssid, ETH_ALEN);
491 else
492 eth_zero_addr(ap_addr->sa_data);
493
494 return 0;
495 }
496 #endif
497
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