1 /*
2 * cfg80211 wext compat for managed mode.
3 *
4 * Copyright 2009 Johannes Berg <johannes@sipsolutions.net>
5 * Copyright (C) 2009 Intel Corporation. All rights reserved.
6 */
7
8 #include <linux/export.h>
9 #include <linux/etherdevice.h>
10 #include <linux/if_arp.h>
11 #include <linux/slab.h>
12 #include <net/cfg80211.h>
13 #include <net/cfg80211-wext.h>
14 #include "wext-compat.h"
15 #include "nl80211.h"
16
cfg80211_mgd_wext_connect(struct cfg80211_registered_device * rdev,struct wireless_dev * wdev)17 int cfg80211_mgd_wext_connect(struct cfg80211_registered_device *rdev,
18 struct wireless_dev *wdev)
19 {
20 struct cfg80211_cached_keys *ck = NULL;
21 const u8 *prev_bssid = NULL;
22 int err, i;
23
24 ASSERT_RTNL();
25 ASSERT_WDEV_LOCK(wdev);
26
27 if (!netif_running(wdev->netdev))
28 return 0;
29
30 wdev->wext.connect.ie = wdev->wext.ie;
31 wdev->wext.connect.ie_len = wdev->wext.ie_len;
32
33 /* Use default background scan period */
34 wdev->wext.connect.bg_scan_period = -1;
35
36 if (wdev->wext.keys) {
37 wdev->wext.keys->def = wdev->wext.default_key;
38 wdev->wext.keys->defmgmt = wdev->wext.default_mgmt_key;
39 if (wdev->wext.default_key != -1)
40 wdev->wext.connect.privacy = true;
41 }
42
43 if (!wdev->wext.connect.ssid_len)
44 return 0;
45
46 if (wdev->wext.keys) {
47 ck = kmemdup(wdev->wext.keys, sizeof(*ck), GFP_KERNEL);
48 if (!ck)
49 return -ENOMEM;
50 for (i = 0; i < 6; i++)
51 ck->params[i].key = ck->data[i];
52 }
53
54 if (wdev->wext.prev_bssid_valid)
55 prev_bssid = wdev->wext.prev_bssid;
56
57 err = cfg80211_connect(rdev, wdev->netdev,
58 &wdev->wext.connect, ck, prev_bssid);
59 if (err)
60 kzfree(ck);
61
62 return err;
63 }
64
cfg80211_mgd_wext_siwfreq(struct net_device * dev,struct iw_request_info * info,struct iw_freq * wextfreq,char * extra)65 int cfg80211_mgd_wext_siwfreq(struct net_device *dev,
66 struct iw_request_info *info,
67 struct iw_freq *wextfreq, char *extra)
68 {
69 struct wireless_dev *wdev = dev->ieee80211_ptr;
70 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
71 struct ieee80211_channel *chan = NULL;
72 int err, freq;
73
74 /* call only for station! */
75 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
76 return -EINVAL;
77
78 freq = cfg80211_wext_freq(wextfreq);
79 if (freq < 0)
80 return freq;
81
82 if (freq) {
83 chan = ieee80211_get_channel(wdev->wiphy, freq);
84 if (!chan)
85 return -EINVAL;
86 if (chan->flags & IEEE80211_CHAN_DISABLED)
87 return -EINVAL;
88 }
89
90 wdev_lock(wdev);
91
92 if (wdev->conn) {
93 bool event = true;
94
95 if (wdev->wext.connect.channel == chan) {
96 err = 0;
97 goto out;
98 }
99
100 /* if SSID set, we'll try right again, avoid event */
101 if (wdev->wext.connect.ssid_len)
102 event = false;
103 err = cfg80211_disconnect(rdev, dev,
104 WLAN_REASON_DEAUTH_LEAVING, event);
105 if (err)
106 goto out;
107 }
108
109
110 wdev->wext.connect.channel = chan;
111
112 /*
113 * SSID is not set, we just want to switch monitor channel,
114 * this is really just backward compatibility, if the SSID
115 * is set then we use the channel to select the BSS to use
116 * to connect to instead. If we were connected on another
117 * channel we disconnected above and reconnect below.
118 */
119 if (chan && !wdev->wext.connect.ssid_len) {
120 struct cfg80211_chan_def chandef = {
121 .width = NL80211_CHAN_WIDTH_20_NOHT,
122 .center_freq1 = freq,
123 };
124
125 chandef.chan = ieee80211_get_channel(&rdev->wiphy, freq);
126 if (chandef.chan)
127 err = cfg80211_set_monitor_channel(rdev, &chandef);
128 else
129 err = -EINVAL;
130 goto out;
131 }
132
133 err = cfg80211_mgd_wext_connect(rdev, wdev);
134 out:
135 wdev_unlock(wdev);
136 return err;
137 }
138
cfg80211_mgd_wext_giwfreq(struct net_device * dev,struct iw_request_info * info,struct iw_freq * freq,char * extra)139 int cfg80211_mgd_wext_giwfreq(struct net_device *dev,
140 struct iw_request_info *info,
141 struct iw_freq *freq, char *extra)
142 {
143 struct wireless_dev *wdev = dev->ieee80211_ptr;
144 struct ieee80211_channel *chan = NULL;
145
146 /* call only for station! */
147 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
148 return -EINVAL;
149
150 wdev_lock(wdev);
151 if (wdev->current_bss)
152 chan = wdev->current_bss->pub.channel;
153 else if (wdev->wext.connect.channel)
154 chan = wdev->wext.connect.channel;
155 wdev_unlock(wdev);
156
157 if (chan) {
158 freq->m = chan->center_freq;
159 freq->e = 6;
160 return 0;
161 }
162
163 /* no channel if not joining */
164 return -EINVAL;
165 }
166
cfg80211_mgd_wext_siwessid(struct net_device * dev,struct iw_request_info * info,struct iw_point * data,char * ssid)167 int cfg80211_mgd_wext_siwessid(struct net_device *dev,
168 struct iw_request_info *info,
169 struct iw_point *data, char *ssid)
170 {
171 struct wireless_dev *wdev = dev->ieee80211_ptr;
172 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
173 size_t len = data->length;
174 int err;
175
176 /* call only for station! */
177 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
178 return -EINVAL;
179
180 if (!data->flags)
181 len = 0;
182
183 /* iwconfig uses nul termination in SSID.. */
184 if (len > 0 && ssid[len - 1] == '\0')
185 len--;
186
187 wdev_lock(wdev);
188
189 err = 0;
190
191 if (wdev->conn) {
192 bool event = true;
193
194 if (wdev->wext.connect.ssid && len &&
195 len == wdev->wext.connect.ssid_len &&
196 memcmp(wdev->wext.connect.ssid, ssid, len) == 0)
197 goto out;
198
199 /* if SSID set now, we'll try to connect, avoid event */
200 if (len)
201 event = false;
202 err = cfg80211_disconnect(rdev, dev,
203 WLAN_REASON_DEAUTH_LEAVING, event);
204 if (err)
205 goto out;
206 }
207
208 wdev->wext.prev_bssid_valid = false;
209 wdev->wext.connect.ssid = wdev->wext.ssid;
210 memcpy(wdev->wext.ssid, ssid, len);
211 wdev->wext.connect.ssid_len = len;
212
213 wdev->wext.connect.crypto.control_port = false;
214 wdev->wext.connect.crypto.control_port_ethertype =
215 cpu_to_be16(ETH_P_PAE);
216
217 err = cfg80211_mgd_wext_connect(rdev, wdev);
218 out:
219 wdev_unlock(wdev);
220 return err;
221 }
222
cfg80211_mgd_wext_giwessid(struct net_device * dev,struct iw_request_info * info,struct iw_point * data,char * ssid)223 int cfg80211_mgd_wext_giwessid(struct net_device *dev,
224 struct iw_request_info *info,
225 struct iw_point *data, char *ssid)
226 {
227 struct wireless_dev *wdev = dev->ieee80211_ptr;
228 int ret = 0;
229
230 /* call only for station! */
231 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
232 return -EINVAL;
233
234 data->flags = 0;
235
236 wdev_lock(wdev);
237 if (wdev->current_bss) {
238 const u8 *ie;
239
240 rcu_read_lock();
241 ie = ieee80211_bss_get_ie(&wdev->current_bss->pub,
242 WLAN_EID_SSID);
243 if (ie) {
244 data->flags = 1;
245 data->length = ie[1];
246 if (data->length > IW_ESSID_MAX_SIZE)
247 ret = -EINVAL;
248 else
249 memcpy(ssid, ie + 2, data->length);
250 }
251 rcu_read_unlock();
252 } else if (wdev->wext.connect.ssid && wdev->wext.connect.ssid_len) {
253 data->flags = 1;
254 data->length = wdev->wext.connect.ssid_len;
255 memcpy(ssid, wdev->wext.connect.ssid, data->length);
256 }
257 wdev_unlock(wdev);
258
259 return ret;
260 }
261
cfg80211_mgd_wext_siwap(struct net_device * dev,struct iw_request_info * info,struct sockaddr * ap_addr,char * extra)262 int cfg80211_mgd_wext_siwap(struct net_device *dev,
263 struct iw_request_info *info,
264 struct sockaddr *ap_addr, char *extra)
265 {
266 struct wireless_dev *wdev = dev->ieee80211_ptr;
267 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
268 u8 *bssid = ap_addr->sa_data;
269 int err;
270
271 /* call only for station! */
272 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
273 return -EINVAL;
274
275 if (ap_addr->sa_family != ARPHRD_ETHER)
276 return -EINVAL;
277
278 /* automatic mode */
279 if (is_zero_ether_addr(bssid) || is_broadcast_ether_addr(bssid))
280 bssid = NULL;
281
282 wdev_lock(wdev);
283
284 if (wdev->conn) {
285 err = 0;
286 /* both automatic */
287 if (!bssid && !wdev->wext.connect.bssid)
288 goto out;
289
290 /* fixed already - and no change */
291 if (wdev->wext.connect.bssid && bssid &&
292 ether_addr_equal(bssid, wdev->wext.connect.bssid))
293 goto out;
294
295 err = cfg80211_disconnect(rdev, dev,
296 WLAN_REASON_DEAUTH_LEAVING, false);
297 if (err)
298 goto out;
299 }
300
301 if (bssid) {
302 memcpy(wdev->wext.bssid, bssid, ETH_ALEN);
303 wdev->wext.connect.bssid = wdev->wext.bssid;
304 } else
305 wdev->wext.connect.bssid = NULL;
306
307 err = cfg80211_mgd_wext_connect(rdev, wdev);
308 out:
309 wdev_unlock(wdev);
310 return err;
311 }
312
cfg80211_mgd_wext_giwap(struct net_device * dev,struct iw_request_info * info,struct sockaddr * ap_addr,char * extra)313 int cfg80211_mgd_wext_giwap(struct net_device *dev,
314 struct iw_request_info *info,
315 struct sockaddr *ap_addr, char *extra)
316 {
317 struct wireless_dev *wdev = dev->ieee80211_ptr;
318
319 /* call only for station! */
320 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
321 return -EINVAL;
322
323 ap_addr->sa_family = ARPHRD_ETHER;
324
325 wdev_lock(wdev);
326 if (wdev->current_bss)
327 memcpy(ap_addr->sa_data, wdev->current_bss->pub.bssid, ETH_ALEN);
328 else
329 eth_zero_addr(ap_addr->sa_data);
330 wdev_unlock(wdev);
331
332 return 0;
333 }
334
cfg80211_wext_siwgenie(struct net_device * dev,struct iw_request_info * info,struct iw_point * data,char * extra)335 int cfg80211_wext_siwgenie(struct net_device *dev,
336 struct iw_request_info *info,
337 struct iw_point *data, char *extra)
338 {
339 struct wireless_dev *wdev = dev->ieee80211_ptr;
340 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
341 u8 *ie = extra;
342 int ie_len = data->length, err;
343
344 if (wdev->iftype != NL80211_IFTYPE_STATION)
345 return -EOPNOTSUPP;
346
347 if (!ie_len)
348 ie = NULL;
349
350 wdev_lock(wdev);
351
352 /* no change */
353 err = 0;
354 if (wdev->wext.ie_len == ie_len &&
355 memcmp(wdev->wext.ie, ie, ie_len) == 0)
356 goto out;
357
358 if (ie_len) {
359 ie = kmemdup(extra, ie_len, GFP_KERNEL);
360 if (!ie) {
361 err = -ENOMEM;
362 goto out;
363 }
364 } else
365 ie = NULL;
366
367 kfree(wdev->wext.ie);
368 wdev->wext.ie = ie;
369 wdev->wext.ie_len = ie_len;
370
371 if (wdev->conn) {
372 err = cfg80211_disconnect(rdev, dev,
373 WLAN_REASON_DEAUTH_LEAVING, false);
374 if (err)
375 goto out;
376 }
377
378 /* userspace better not think we'll reconnect */
379 err = 0;
380 out:
381 wdev_unlock(wdev);
382 return err;
383 }
384
cfg80211_wext_siwmlme(struct net_device * dev,struct iw_request_info * info,struct iw_point * data,char * extra)385 int cfg80211_wext_siwmlme(struct net_device *dev,
386 struct iw_request_info *info,
387 struct iw_point *data, char *extra)
388 {
389 struct wireless_dev *wdev = dev->ieee80211_ptr;
390 struct iw_mlme *mlme = (struct iw_mlme *)extra;
391 struct cfg80211_registered_device *rdev;
392 int err;
393
394 if (!wdev)
395 return -EOPNOTSUPP;
396
397 rdev = wiphy_to_rdev(wdev->wiphy);
398
399 if (wdev->iftype != NL80211_IFTYPE_STATION)
400 return -EINVAL;
401
402 if (mlme->addr.sa_family != ARPHRD_ETHER)
403 return -EINVAL;
404
405 wdev_lock(wdev);
406 switch (mlme->cmd) {
407 case IW_MLME_DEAUTH:
408 case IW_MLME_DISASSOC:
409 err = cfg80211_disconnect(rdev, dev, mlme->reason_code, true);
410 break;
411 default:
412 err = -EOPNOTSUPP;
413 break;
414 }
415 wdev_unlock(wdev);
416
417 return err;
418 }
419