Linux 3.12.28
[linux/fpc-iii.git] / net / wireless / ibss.c
blob403fe29c024db86f732b0c0d74b8d97d4cfc84bf
1 /*
2 * Some IBSS support code for cfg80211.
4 * Copyright 2009 Johannes Berg <johannes@sipsolutions.net>
5 */
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"
17 void __cfg80211_ibss_joined(struct net_device *dev, const u8 *bssid)
19 struct wireless_dev *wdev = dev->ieee80211_ptr;
20 struct cfg80211_bss *bss;
21 #ifdef CONFIG_CFG80211_WEXT
22 union iwreq_data wrqu;
23 #endif
25 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
26 return;
28 if (!wdev->ssid_len)
29 return;
31 bss = cfg80211_get_bss(wdev->wiphy, NULL, bssid,
32 wdev->ssid, wdev->ssid_len,
33 WLAN_CAPABILITY_IBSS, WLAN_CAPABILITY_IBSS);
35 if (WARN_ON(!bss))
36 return;
38 if (wdev->current_bss) {
39 cfg80211_unhold_bss(wdev->current_bss);
40 cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
43 cfg80211_hold_bss(bss_from_pub(bss));
44 wdev->current_bss = bss_from_pub(bss);
46 cfg80211_upload_connect_keys(wdev);
48 nl80211_send_ibss_bssid(wiphy_to_dev(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
57 void cfg80211_ibss_joined(struct net_device *dev, const u8 *bssid, gfp_t gfp)
59 struct wireless_dev *wdev = dev->ieee80211_ptr;
60 struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
61 struct cfg80211_event *ev;
62 unsigned long flags;
64 trace_cfg80211_ibss_joined(dev, bssid);
66 ev = kzalloc(sizeof(*ev), gfp);
67 if (!ev)
68 return;
70 ev->type = EVENT_IBSS_JOINED;
71 memcpy(ev->cr.bssid, bssid, ETH_ALEN);
73 spin_lock_irqsave(&wdev->event_lock, flags);
74 list_add_tail(&ev->list, &wdev->event_list);
75 spin_unlock_irqrestore(&wdev->event_lock, flags);
76 queue_work(cfg80211_wq, &rdev->event_work);
78 EXPORT_SYMBOL(cfg80211_ibss_joined);
80 int __cfg80211_join_ibss(struct cfg80211_registered_device *rdev,
81 struct net_device *dev,
82 struct cfg80211_ibss_params *params,
83 struct cfg80211_cached_keys *connkeys)
85 struct wireless_dev *wdev = dev->ieee80211_ptr;
86 int err;
88 ASSERT_WDEV_LOCK(wdev);
90 if (wdev->ssid_len)
91 return -EALREADY;
93 if (!params->basic_rates) {
95 * If no rates were explicitly configured,
96 * use the mandatory rate set for 11b or
97 * 11a for maximum compatibility.
99 struct ieee80211_supported_band *sband =
100 rdev->wiphy.bands[params->chandef.chan->band];
101 int j;
102 u32 flag = params->chandef.chan->band == IEEE80211_BAND_5GHZ ?
103 IEEE80211_RATE_MANDATORY_A :
104 IEEE80211_RATE_MANDATORY_B;
106 for (j = 0; j < sband->n_bitrates; j++) {
107 if (sband->bitrates[j].flags & flag)
108 params->basic_rates |= BIT(j);
112 if (WARN_ON(wdev->connect_keys))
113 kfree(wdev->connect_keys);
114 wdev->connect_keys = connkeys;
116 wdev->ibss_fixed = params->channel_fixed;
117 #ifdef CONFIG_CFG80211_WEXT
118 wdev->wext.ibss.chandef = params->chandef;
119 #endif
121 err = cfg80211_can_use_chan(rdev, wdev, params->chandef.chan,
122 params->channel_fixed
123 ? CHAN_MODE_SHARED
124 : CHAN_MODE_EXCLUSIVE);
125 if (err) {
126 wdev->connect_keys = NULL;
127 return err;
130 err = rdev_join_ibss(rdev, dev, params);
131 if (err) {
132 wdev->connect_keys = NULL;
133 return err;
136 memcpy(wdev->ssid, params->ssid, params->ssid_len);
137 wdev->ssid_len = params->ssid_len;
139 return 0;
142 int cfg80211_join_ibss(struct cfg80211_registered_device *rdev,
143 struct net_device *dev,
144 struct cfg80211_ibss_params *params,
145 struct cfg80211_cached_keys *connkeys)
147 struct wireless_dev *wdev = dev->ieee80211_ptr;
148 int err;
150 ASSERT_RTNL();
152 wdev_lock(wdev);
153 err = __cfg80211_join_ibss(rdev, dev, params, connkeys);
154 wdev_unlock(wdev);
156 return err;
159 static void __cfg80211_clear_ibss(struct net_device *dev, bool nowext)
161 struct wireless_dev *wdev = dev->ieee80211_ptr;
162 struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
163 int i;
165 ASSERT_WDEV_LOCK(wdev);
167 kfree(wdev->connect_keys);
168 wdev->connect_keys = NULL;
171 * Delete all the keys ... pairwise keys can't really
172 * exist any more anyway, but default keys might.
174 if (rdev->ops->del_key)
175 for (i = 0; i < 6; i++)
176 rdev_del_key(rdev, dev, i, false, NULL);
178 if (wdev->current_bss) {
179 cfg80211_unhold_bss(wdev->current_bss);
180 cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
183 wdev->current_bss = NULL;
184 wdev->ssid_len = 0;
185 #ifdef CONFIG_CFG80211_WEXT
186 if (!nowext)
187 wdev->wext.ibss.ssid_len = 0;
188 #endif
191 void cfg80211_clear_ibss(struct net_device *dev, bool nowext)
193 struct wireless_dev *wdev = dev->ieee80211_ptr;
195 wdev_lock(wdev);
196 __cfg80211_clear_ibss(dev, nowext);
197 wdev_unlock(wdev);
200 int __cfg80211_leave_ibss(struct cfg80211_registered_device *rdev,
201 struct net_device *dev, bool nowext)
203 struct wireless_dev *wdev = dev->ieee80211_ptr;
204 int err;
206 ASSERT_WDEV_LOCK(wdev);
208 if (!wdev->ssid_len)
209 return -ENOLINK;
211 err = rdev_leave_ibss(rdev, dev);
213 if (err)
214 return err;
216 __cfg80211_clear_ibss(dev, nowext);
218 return 0;
221 int cfg80211_leave_ibss(struct cfg80211_registered_device *rdev,
222 struct net_device *dev, bool nowext)
224 struct wireless_dev *wdev = dev->ieee80211_ptr;
225 int err;
227 wdev_lock(wdev);
228 err = __cfg80211_leave_ibss(rdev, dev, nowext);
229 wdev_unlock(wdev);
231 return err;
234 #ifdef CONFIG_CFG80211_WEXT
235 int cfg80211_ibss_wext_join(struct cfg80211_registered_device *rdev,
236 struct wireless_dev *wdev)
238 struct cfg80211_cached_keys *ck = NULL;
239 enum ieee80211_band band;
240 int i, err;
242 ASSERT_WDEV_LOCK(wdev);
244 if (!wdev->wext.ibss.beacon_interval)
245 wdev->wext.ibss.beacon_interval = 100;
247 /* try to find an IBSS channel if none requested ... */
248 if (!wdev->wext.ibss.chandef.chan) {
249 wdev->wext.ibss.chandef.width = NL80211_CHAN_WIDTH_20_NOHT;
251 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
252 struct ieee80211_supported_band *sband;
253 struct ieee80211_channel *chan;
255 sband = rdev->wiphy.bands[band];
256 if (!sband)
257 continue;
259 for (i = 0; i < sband->n_channels; i++) {
260 chan = &sband->channels[i];
261 if (chan->flags & IEEE80211_CHAN_NO_IBSS)
262 continue;
263 if (chan->flags & IEEE80211_CHAN_DISABLED)
264 continue;
265 wdev->wext.ibss.chandef.chan = chan;
266 wdev->wext.ibss.chandef.center_freq1 =
267 chan->center_freq;
268 break;
271 if (wdev->wext.ibss.chandef.chan)
272 break;
275 if (!wdev->wext.ibss.chandef.chan)
276 return -EINVAL;
279 /* don't join -- SSID is not there */
280 if (!wdev->wext.ibss.ssid_len)
281 return 0;
283 if (!netif_running(wdev->netdev))
284 return 0;
286 if (wdev->wext.keys) {
287 wdev->wext.keys->def = wdev->wext.default_key;
288 wdev->wext.keys->defmgmt = wdev->wext.default_mgmt_key;
291 wdev->wext.ibss.privacy = wdev->wext.default_key != -1;
293 if (wdev->wext.keys) {
294 ck = kmemdup(wdev->wext.keys, sizeof(*ck), GFP_KERNEL);
295 if (!ck)
296 return -ENOMEM;
297 for (i = 0; i < 6; i++)
298 ck->params[i].key = ck->data[i];
300 err = __cfg80211_join_ibss(rdev, wdev->netdev,
301 &wdev->wext.ibss, ck);
302 if (err)
303 kfree(ck);
305 return err;
308 int cfg80211_ibss_wext_siwfreq(struct net_device *dev,
309 struct iw_request_info *info,
310 struct iw_freq *wextfreq, char *extra)
312 struct wireless_dev *wdev = dev->ieee80211_ptr;
313 struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
314 struct ieee80211_channel *chan = NULL;
315 int err, freq;
317 /* call only for ibss! */
318 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
319 return -EINVAL;
321 if (!rdev->ops->join_ibss)
322 return -EOPNOTSUPP;
324 freq = cfg80211_wext_freq(wdev->wiphy, wextfreq);
325 if (freq < 0)
326 return freq;
328 if (freq) {
329 chan = ieee80211_get_channel(wdev->wiphy, freq);
330 if (!chan)
331 return -EINVAL;
332 if (chan->flags & IEEE80211_CHAN_NO_IBSS ||
333 chan->flags & IEEE80211_CHAN_DISABLED)
334 return -EINVAL;
337 if (wdev->wext.ibss.chandef.chan == chan)
338 return 0;
340 wdev_lock(wdev);
341 err = 0;
342 if (wdev->ssid_len)
343 err = __cfg80211_leave_ibss(rdev, dev, true);
344 wdev_unlock(wdev);
346 if (err)
347 return err;
349 if (chan) {
350 wdev->wext.ibss.chandef.chan = chan;
351 wdev->wext.ibss.chandef.width = NL80211_CHAN_WIDTH_20_NOHT;
352 wdev->wext.ibss.chandef.center_freq1 = freq;
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;
359 wdev_lock(wdev);
360 err = cfg80211_ibss_wext_join(rdev, wdev);
361 wdev_unlock(wdev);
363 return err;
366 int cfg80211_ibss_wext_giwfreq(struct net_device *dev,
367 struct iw_request_info *info,
368 struct iw_freq *freq, char *extra)
370 struct wireless_dev *wdev = dev->ieee80211_ptr;
371 struct ieee80211_channel *chan = NULL;
373 /* call only for ibss! */
374 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
375 return -EINVAL;
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);
384 if (chan) {
385 freq->m = chan->center_freq;
386 freq->e = 6;
387 return 0;
390 /* no channel if not joining */
391 return -EINVAL;
394 int cfg80211_ibss_wext_siwessid(struct net_device *dev,
395 struct iw_request_info *info,
396 struct iw_point *data, char *ssid)
398 struct wireless_dev *wdev = dev->ieee80211_ptr;
399 struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
400 size_t len = data->length;
401 int err;
403 /* call only for ibss! */
404 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
405 return -EINVAL;
407 if (!rdev->ops->join_ibss)
408 return -EOPNOTSUPP;
410 wdev_lock(wdev);
411 err = 0;
412 if (wdev->ssid_len)
413 err = __cfg80211_leave_ibss(rdev, dev, true);
414 wdev_unlock(wdev);
416 if (err)
417 return err;
419 /* iwconfig uses nul termination in SSID.. */
420 if (len > 0 && ssid[len - 1] == '\0')
421 len--;
423 wdev->wext.ibss.ssid = wdev->ssid;
424 memcpy(wdev->wext.ibss.ssid, ssid, len);
425 wdev->wext.ibss.ssid_len = len;
427 wdev_lock(wdev);
428 err = cfg80211_ibss_wext_join(rdev, wdev);
429 wdev_unlock(wdev);
431 return err;
434 int cfg80211_ibss_wext_giwessid(struct net_device *dev,
435 struct iw_request_info *info,
436 struct iw_point *data, char *ssid)
438 struct wireless_dev *wdev = dev->ieee80211_ptr;
440 /* call only for ibss! */
441 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
442 return -EINVAL;
444 data->flags = 0;
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);
456 wdev_unlock(wdev);
458 return 0;
461 int cfg80211_ibss_wext_siwap(struct net_device *dev,
462 struct iw_request_info *info,
463 struct sockaddr *ap_addr, char *extra)
465 struct wireless_dev *wdev = dev->ieee80211_ptr;
466 struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
467 u8 *bssid = ap_addr->sa_data;
468 int err;
470 /* call only for ibss! */
471 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
472 return -EINVAL;
474 if (!rdev->ops->join_ibss)
475 return -EOPNOTSUPP;
477 if (ap_addr->sa_family != ARPHRD_ETHER)
478 return -EINVAL;
480 /* automatic mode */
481 if (is_zero_ether_addr(bssid) || is_broadcast_ether_addr(bssid))
482 bssid = NULL;
484 /* both automatic */
485 if (!bssid && !wdev->wext.ibss.bssid)
486 return 0;
488 /* fixed already - and no change */
489 if (wdev->wext.ibss.bssid && bssid &&
490 ether_addr_equal(bssid, wdev->wext.ibss.bssid))
491 return 0;
493 wdev_lock(wdev);
494 err = 0;
495 if (wdev->ssid_len)
496 err = __cfg80211_leave_ibss(rdev, dev, true);
497 wdev_unlock(wdev);
499 if (err)
500 return err;
502 if (bssid) {
503 memcpy(wdev->wext.bssid, bssid, ETH_ALEN);
504 wdev->wext.ibss.bssid = wdev->wext.bssid;
505 } else
506 wdev->wext.ibss.bssid = NULL;
508 wdev_lock(wdev);
509 err = cfg80211_ibss_wext_join(rdev, wdev);
510 wdev_unlock(wdev);
512 return err;
515 int cfg80211_ibss_wext_giwap(struct net_device *dev,
516 struct iw_request_info *info,
517 struct sockaddr *ap_addr, char *extra)
519 struct wireless_dev *wdev = dev->ieee80211_ptr;
521 /* call only for ibss! */
522 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
523 return -EINVAL;
525 ap_addr->sa_family = ARPHRD_ETHER;
527 wdev_lock(wdev);
528 if (wdev->current_bss)
529 memcpy(ap_addr->sa_data, wdev->current_bss->pub.bssid, ETH_ALEN);
530 else if (wdev->wext.ibss.bssid)
531 memcpy(ap_addr->sa_data, wdev->wext.ibss.bssid, ETH_ALEN);
532 else
533 memset(ap_addr->sa_data, 0, ETH_ALEN);
535 wdev_unlock(wdev);
537 return 0;
539 #endif