xref: /linux/net/wireless/ibss.c (revision ca55b2fef3a9373fcfc30f82fd26bc7fccbda732)
1 /*
2  * Some IBSS support code for cfg80211.
3  *
4  * Copyright 2009	Johannes Berg <johannes@sipsolutions.net>
5  */
6 
7 #include <linux/etherdevice.h>
8 #include <linux/if_arp.h>
9 #include <linux/slab.h>
10 #include <linux/export.h>
11 #include <net/cfg80211.h>
12 #include "wext-compat.h"
13 #include "nl80211.h"
14 #include "rdev-ops.h"
15 
16 
17 void __cfg80211_ibss_joined(struct net_device *dev, const u8 *bssid,
18 			    struct ieee80211_channel *channel)
19 {
20 	struct wireless_dev *wdev = dev->ieee80211_ptr;
21 	struct cfg80211_bss *bss;
22 #ifdef CONFIG_CFG80211_WEXT
23 	union iwreq_data wrqu;
24 #endif
25 
26 	if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
27 		return;
28 
29 	if (!wdev->ssid_len)
30 		return;
31 
32 	bss = cfg80211_get_bss(wdev->wiphy, channel, bssid, NULL, 0,
33 			       IEEE80211_BSS_TYPE_IBSS, IEEE80211_PRIVACY_ANY);
34 
35 	if (WARN_ON(!bss))
36 		return;
37 
38 	if (wdev->current_bss) {
39 		cfg80211_unhold_bss(wdev->current_bss);
40 		cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
41 	}
42 
43 	cfg80211_hold_bss(bss_from_pub(bss));
44 	wdev->current_bss = bss_from_pub(bss);
45 
46 	cfg80211_upload_connect_keys(wdev);
47 
48 	nl80211_send_ibss_bssid(wiphy_to_rdev(wdev->wiphy), dev, bssid,
49 				GFP_KERNEL);
50 #ifdef CONFIG_CFG80211_WEXT
51 	memset(&wrqu, 0, sizeof(wrqu));
52 	memcpy(wrqu.ap_addr.sa_data, bssid, ETH_ALEN);
53 	wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL);
54 #endif
55 }
56 
57 void cfg80211_ibss_joined(struct net_device *dev, const u8 *bssid,
58 			  struct ieee80211_channel *channel, gfp_t gfp)
59 {
60 	struct wireless_dev *wdev = dev->ieee80211_ptr;
61 	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
62 	struct cfg80211_event *ev;
63 	unsigned long flags;
64 
65 	trace_cfg80211_ibss_joined(dev, bssid, channel);
66 
67 	if (WARN_ON(!channel))
68 		return;
69 
70 	ev = kzalloc(sizeof(*ev), gfp);
71 	if (!ev)
72 		return;
73 
74 	ev->type = EVENT_IBSS_JOINED;
75 	memcpy(ev->ij.bssid, bssid, ETH_ALEN);
76 	ev->ij.channel = channel;
77 
78 	spin_lock_irqsave(&wdev->event_lock, flags);
79 	list_add_tail(&ev->list, &wdev->event_list);
80 	spin_unlock_irqrestore(&wdev->event_lock, flags);
81 	queue_work(cfg80211_wq, &rdev->event_work);
82 }
83 EXPORT_SYMBOL(cfg80211_ibss_joined);
84 
85 static int __cfg80211_join_ibss(struct cfg80211_registered_device *rdev,
86 				struct net_device *dev,
87 				struct cfg80211_ibss_params *params,
88 				struct cfg80211_cached_keys *connkeys)
89 {
90 	struct wireless_dev *wdev = dev->ieee80211_ptr;
91 	int err;
92 
93 	ASSERT_WDEV_LOCK(wdev);
94 
95 	if (wdev->ssid_len)
96 		return -EALREADY;
97 
98 	if (!params->basic_rates) {
99 		/*
100 		* If no rates were explicitly configured,
101 		* use the mandatory rate set for 11b or
102 		* 11a for maximum compatibility.
103 		*/
104 		struct ieee80211_supported_band *sband =
105 			rdev->wiphy.bands[params->chandef.chan->band];
106 		int j;
107 		u32 flag = params->chandef.chan->band == IEEE80211_BAND_5GHZ ?
108 			IEEE80211_RATE_MANDATORY_A :
109 			IEEE80211_RATE_MANDATORY_B;
110 
111 		for (j = 0; j < sband->n_bitrates; j++) {
112 			if (sband->bitrates[j].flags & flag)
113 				params->basic_rates |= BIT(j);
114 		}
115 	}
116 
117 	if (WARN_ON(wdev->connect_keys))
118 		kzfree(wdev->connect_keys);
119 	wdev->connect_keys = connkeys;
120 
121 	wdev->ibss_fixed = params->channel_fixed;
122 	wdev->ibss_dfs_possible = params->userspace_handles_dfs;
123 	wdev->chandef = params->chandef;
124 #ifdef CONFIG_CFG80211_WEXT
125 	wdev->wext.ibss.chandef = params->chandef;
126 #endif
127 	err = rdev_join_ibss(rdev, dev, params);
128 	if (err) {
129 		wdev->connect_keys = NULL;
130 		return err;
131 	}
132 
133 	memcpy(wdev->ssid, params->ssid, params->ssid_len);
134 	wdev->ssid_len = params->ssid_len;
135 
136 	return 0;
137 }
138 
139 int cfg80211_join_ibss(struct cfg80211_registered_device *rdev,
140 		       struct net_device *dev,
141 		       struct cfg80211_ibss_params *params,
142 		       struct cfg80211_cached_keys *connkeys)
143 {
144 	struct wireless_dev *wdev = dev->ieee80211_ptr;
145 	int err;
146 
147 	ASSERT_RTNL();
148 
149 	wdev_lock(wdev);
150 	err = __cfg80211_join_ibss(rdev, dev, params, connkeys);
151 	wdev_unlock(wdev);
152 
153 	return err;
154 }
155 
156 static 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 	ASSERT_WDEV_LOCK(wdev);
163 
164 	kzfree(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, i, false, NULL);
176 
177 	if (wdev->current_bss) {
178 		cfg80211_unhold_bss(wdev->current_bss);
179 		cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
180 	}
181 
182 	wdev->current_bss = NULL;
183 	wdev->ssid_len = 0;
184 	memset(&wdev->chandef, 0, sizeof(wdev->chandef));
185 #ifdef CONFIG_CFG80211_WEXT
186 	if (!nowext)
187 		wdev->wext.ibss.ssid_len = 0;
188 #endif
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 	__cfg80211_clear_ibss(dev, nowext);
217 
218 	return 0;
219 }
220 
221 int cfg80211_leave_ibss(struct cfg80211_registered_device *rdev,
222 			struct net_device *dev, bool nowext)
223 {
224 	struct wireless_dev *wdev = dev->ieee80211_ptr;
225 	int err;
226 
227 	wdev_lock(wdev);
228 	err = __cfg80211_leave_ibss(rdev, dev, nowext);
229 	wdev_unlock(wdev);
230 
231 	return err;
232 }
233 
234 #ifdef CONFIG_CFG80211_WEXT
235 int cfg80211_ibss_wext_join(struct cfg80211_registered_device *rdev,
236 			    struct wireless_dev *wdev)
237 {
238 	struct cfg80211_cached_keys *ck = NULL;
239 	enum ieee80211_band band;
240 	int i, err;
241 
242 	ASSERT_WDEV_LOCK(wdev);
243 
244 	if (!wdev->wext.ibss.beacon_interval)
245 		wdev->wext.ibss.beacon_interval = 100;
246 
247 	/* try to find an IBSS channel if none requested ... */
248 	if (!wdev->wext.ibss.chandef.chan) {
249 		struct ieee80211_channel *new_chan = NULL;
250 
251 		for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
252 			struct ieee80211_supported_band *sband;
253 			struct ieee80211_channel *chan;
254 
255 			sband = rdev->wiphy.bands[band];
256 			if (!sband)
257 				continue;
258 
259 			for (i = 0; i < sband->n_channels; i++) {
260 				chan = &sband->channels[i];
261 				if (chan->flags & IEEE80211_CHAN_NO_IR)
262 					continue;
263 				if (chan->flags & IEEE80211_CHAN_DISABLED)
264 					continue;
265 				new_chan = chan;
266 				break;
267 			}
268 
269 			if (new_chan)
270 				break;
271 		}
272 
273 		if (!new_chan)
274 			return -EINVAL;
275 
276 		cfg80211_chandef_create(&wdev->wext.ibss.chandef, new_chan,
277 					NL80211_CHAN_NO_HT);
278 	}
279 
280 	/* don't join -- SSID is not there */
281 	if (!wdev->wext.ibss.ssid_len)
282 		return 0;
283 
284 	if (!netif_running(wdev->netdev))
285 		return 0;
286 
287 	if (wdev->wext.keys) {
288 		wdev->wext.keys->def = wdev->wext.default_key;
289 		wdev->wext.keys->defmgmt = wdev->wext.default_mgmt_key;
290 	}
291 
292 	wdev->wext.ibss.privacy = wdev->wext.default_key != -1;
293 
294 	if (wdev->wext.keys) {
295 		ck = kmemdup(wdev->wext.keys, sizeof(*ck), GFP_KERNEL);
296 		if (!ck)
297 			return -ENOMEM;
298 		for (i = 0; i < 6; i++)
299 			ck->params[i].key = ck->data[i];
300 	}
301 	err = __cfg80211_join_ibss(rdev, wdev->netdev,
302 				   &wdev->wext.ibss, ck);
303 	if (err)
304 		kfree(ck);
305 
306 	return err;
307 }
308 
309 int cfg80211_ibss_wext_siwfreq(struct net_device *dev,
310 			       struct iw_request_info *info,
311 			       struct iw_freq *wextfreq, char *extra)
312 {
313 	struct wireless_dev *wdev = dev->ieee80211_ptr;
314 	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
315 	struct ieee80211_channel *chan = NULL;
316 	int err, freq;
317 
318 	/* call only for ibss! */
319 	if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
320 		return -EINVAL;
321 
322 	if (!rdev->ops->join_ibss)
323 		return -EOPNOTSUPP;
324 
325 	freq = cfg80211_wext_freq(wextfreq);
326 	if (freq < 0)
327 		return freq;
328 
329 	if (freq) {
330 		chan = ieee80211_get_channel(wdev->wiphy, freq);
331 		if (!chan)
332 			return -EINVAL;
333 		if (chan->flags & IEEE80211_CHAN_NO_IR ||
334 		    chan->flags & IEEE80211_CHAN_DISABLED)
335 			return -EINVAL;
336 	}
337 
338 	if (wdev->wext.ibss.chandef.chan == chan)
339 		return 0;
340 
341 	wdev_lock(wdev);
342 	err = 0;
343 	if (wdev->ssid_len)
344 		err = __cfg80211_leave_ibss(rdev, dev, true);
345 	wdev_unlock(wdev);
346 
347 	if (err)
348 		return err;
349 
350 	if (chan) {
351 		cfg80211_chandef_create(&wdev->wext.ibss.chandef, chan,
352 					NL80211_CHAN_NO_HT);
353 		wdev->wext.ibss.channel_fixed = true;
354 	} else {
355 		/* cfg80211_ibss_wext_join will pick one if needed */
356 		wdev->wext.ibss.channel_fixed = false;
357 	}
358 
359 	wdev_lock(wdev);
360 	err = cfg80211_ibss_wext_join(rdev, wdev);
361 	wdev_unlock(wdev);
362 
363 	return err;
364 }
365 
366 int cfg80211_ibss_wext_giwfreq(struct net_device *dev,
367 			       struct iw_request_info *info,
368 			       struct iw_freq *freq, char *extra)
369 {
370 	struct wireless_dev *wdev = dev->ieee80211_ptr;
371 	struct ieee80211_channel *chan = NULL;
372 
373 	/* call only for ibss! */
374 	if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
375 		return -EINVAL;
376 
377 	wdev_lock(wdev);
378 	if (wdev->current_bss)
379 		chan = wdev->current_bss->pub.channel;
380 	else if (wdev->wext.ibss.chandef.chan)
381 		chan = wdev->wext.ibss.chandef.chan;
382 	wdev_unlock(wdev);
383 
384 	if (chan) {
385 		freq->m = chan->center_freq;
386 		freq->e = 6;
387 		return 0;
388 	}
389 
390 	/* no channel if not joining */
391 	return -EINVAL;
392 }
393 
394 int cfg80211_ibss_wext_siwessid(struct net_device *dev,
395 				struct iw_request_info *info,
396 				struct iw_point *data, char *ssid)
397 {
398 	struct wireless_dev *wdev = dev->ieee80211_ptr;
399 	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
400 	size_t len = data->length;
401 	int err;
402 
403 	/* call only for ibss! */
404 	if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
405 		return -EINVAL;
406 
407 	if (!rdev->ops->join_ibss)
408 		return -EOPNOTSUPP;
409 
410 	wdev_lock(wdev);
411 	err = 0;
412 	if (wdev->ssid_len)
413 		err = __cfg80211_leave_ibss(rdev, dev, true);
414 	wdev_unlock(wdev);
415 
416 	if (err)
417 		return err;
418 
419 	/* iwconfig uses nul termination in SSID.. */
420 	if (len > 0 && ssid[len - 1] == '\0')
421 		len--;
422 
423 	memcpy(wdev->ssid, ssid, len);
424 	wdev->wext.ibss.ssid = wdev->ssid;
425 	wdev->wext.ibss.ssid_len = len;
426 
427 	wdev_lock(wdev);
428 	err = cfg80211_ibss_wext_join(rdev, wdev);
429 	wdev_unlock(wdev);
430 
431 	return err;
432 }
433 
434 int cfg80211_ibss_wext_giwessid(struct net_device *dev,
435 				struct iw_request_info *info,
436 				struct iw_point *data, char *ssid)
437 {
438 	struct wireless_dev *wdev = dev->ieee80211_ptr;
439 
440 	/* call only for ibss! */
441 	if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
442 		return -EINVAL;
443 
444 	data->flags = 0;
445 
446 	wdev_lock(wdev);
447 	if (wdev->ssid_len) {
448 		data->flags = 1;
449 		data->length = wdev->ssid_len;
450 		memcpy(ssid, wdev->ssid, data->length);
451 	} else if (wdev->wext.ibss.ssid && wdev->wext.ibss.ssid_len) {
452 		data->flags = 1;
453 		data->length = wdev->wext.ibss.ssid_len;
454 		memcpy(ssid, wdev->wext.ibss.ssid, data->length);
455 	}
456 	wdev_unlock(wdev);
457 
458 	return 0;
459 }
460 
461 int cfg80211_ibss_wext_siwap(struct net_device *dev,
462 			     struct iw_request_info *info,
463 			     struct sockaddr *ap_addr, char *extra)
464 {
465 	struct wireless_dev *wdev = dev->ieee80211_ptr;
466 	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
467 	u8 *bssid = ap_addr->sa_data;
468 	int err;
469 
470 	/* call only for ibss! */
471 	if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
472 		return -EINVAL;
473 
474 	if (!rdev->ops->join_ibss)
475 		return -EOPNOTSUPP;
476 
477 	if (ap_addr->sa_family != ARPHRD_ETHER)
478 		return -EINVAL;
479 
480 	/* automatic mode */
481 	if (is_zero_ether_addr(bssid) || is_broadcast_ether_addr(bssid))
482 		bssid = NULL;
483 
484 	if (bssid && !is_valid_ether_addr(bssid))
485 		return -EINVAL;
486 
487 	/* both automatic */
488 	if (!bssid && !wdev->wext.ibss.bssid)
489 		return 0;
490 
491 	/* fixed already - and no change */
492 	if (wdev->wext.ibss.bssid && bssid &&
493 	    ether_addr_equal(bssid, wdev->wext.ibss.bssid))
494 		return 0;
495 
496 	wdev_lock(wdev);
497 	err = 0;
498 	if (wdev->ssid_len)
499 		err = __cfg80211_leave_ibss(rdev, dev, true);
500 	wdev_unlock(wdev);
501 
502 	if (err)
503 		return err;
504 
505 	if (bssid) {
506 		memcpy(wdev->wext.bssid, bssid, ETH_ALEN);
507 		wdev->wext.ibss.bssid = wdev->wext.bssid;
508 	} else
509 		wdev->wext.ibss.bssid = NULL;
510 
511 	wdev_lock(wdev);
512 	err = cfg80211_ibss_wext_join(rdev, wdev);
513 	wdev_unlock(wdev);
514 
515 	return err;
516 }
517 
518 int cfg80211_ibss_wext_giwap(struct net_device *dev,
519 			     struct iw_request_info *info,
520 			     struct sockaddr *ap_addr, char *extra)
521 {
522 	struct wireless_dev *wdev = dev->ieee80211_ptr;
523 
524 	/* call only for ibss! */
525 	if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
526 		return -EINVAL;
527 
528 	ap_addr->sa_family = ARPHRD_ETHER;
529 
530 	wdev_lock(wdev);
531 	if (wdev->current_bss)
532 		memcpy(ap_addr->sa_data, wdev->current_bss->pub.bssid, 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