xref: /linux/net/wireless/ibss.c (revision d53b8e36925256097a08d7cb749198d85cbf9b2b)
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