1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * cfg80211 wext compat for managed mode.
4 *
5 * Copyright 2009 Johannes Berg <johannes@sipsolutions.net>
6 * Copyright (C) 2009 Intel Corporation. All rights reserved.
7 */
8
9 #include <linux/export.h>
10 #include <linux/etherdevice.h>
11 #include <linux/if_arp.h>
12 #include <linux/slab.h>
13 #include <net/cfg80211.h>
14 #include <net/cfg80211-wext.h>
15 #include "wext-compat.h"
16 #include "nl80211.h"
17
cfg80211_mgd_wext_connect(struct cfg80211_registered_device * rdev,struct wireless_dev * wdev)18 int cfg80211_mgd_wext_connect(struct cfg80211_registered_device *rdev,
19 struct wireless_dev *wdev)
20 {
21 struct cfg80211_cached_keys *ck = NULL;
22 const u8 *prev_bssid = NULL;
23 int err, i;
24
25 ASSERT_RTNL();
26 ASSERT_WDEV_LOCK(wdev);
27
28 if (!netif_running(wdev->netdev))
29 return 0;
30
31 wdev->wext.connect.ie = wdev->wext.ie;
32 wdev->wext.connect.ie_len = wdev->wext.ie_len;
33
34 /* Use default background scan period */
35 wdev->wext.connect.bg_scan_period = -1;
36
37 if (wdev->wext.keys) {
38 wdev->wext.keys->def = wdev->wext.default_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 && wdev->wext.keys->def != -1) {
47 ck = kmemdup(wdev->wext.keys, sizeof(*ck), GFP_KERNEL);
48 if (!ck)
49 return -ENOMEM;
50 for (i = 0; i < CFG80211_MAX_WEP_KEYS; 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 kfree_sensitive(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 wdev->wext.connect.channel = chan;
110 err = cfg80211_mgd_wext_connect(rdev, wdev);
111 out:
112 wdev_unlock(wdev);
113 return err;
114 }
115
cfg80211_mgd_wext_giwfreq(struct net_device * dev,struct iw_request_info * info,struct iw_freq * freq,char * extra)116 int cfg80211_mgd_wext_giwfreq(struct net_device *dev,
117 struct iw_request_info *info,
118 struct iw_freq *freq, char *extra)
119 {
120 struct wireless_dev *wdev = dev->ieee80211_ptr;
121 struct ieee80211_channel *chan = NULL;
122
123 /* call only for station! */
124 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
125 return -EINVAL;
126
127 wdev_lock(wdev);
128 if (wdev->current_bss)
129 chan = wdev->current_bss->pub.channel;
130 else if (wdev->wext.connect.channel)
131 chan = wdev->wext.connect.channel;
132 wdev_unlock(wdev);
133
134 if (chan) {
135 freq->m = chan->center_freq;
136 freq->e = 6;
137 return 0;
138 }
139
140 /* no channel if not joining */
141 return -EINVAL;
142 }
143
cfg80211_mgd_wext_siwessid(struct net_device * dev,struct iw_request_info * info,struct iw_point * data,char * ssid)144 int cfg80211_mgd_wext_siwessid(struct net_device *dev,
145 struct iw_request_info *info,
146 struct iw_point *data, char *ssid)
147 {
148 struct wireless_dev *wdev = dev->ieee80211_ptr;
149 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
150 size_t len = data->length;
151 int err;
152
153 /* call only for station! */
154 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
155 return -EINVAL;
156
157 if (!data->flags)
158 len = 0;
159
160 /* iwconfig uses nul termination in SSID.. */
161 if (len > 0 && ssid[len - 1] == '\0')
162 len--;
163
164 wdev_lock(wdev);
165
166 err = 0;
167
168 if (wdev->conn) {
169 bool event = true;
170
171 if (wdev->wext.connect.ssid && len &&
172 len == wdev->wext.connect.ssid_len &&
173 memcmp(wdev->wext.connect.ssid, ssid, len) == 0)
174 goto out;
175
176 /* if SSID set now, we'll try to connect, avoid event */
177 if (len)
178 event = false;
179 err = cfg80211_disconnect(rdev, dev,
180 WLAN_REASON_DEAUTH_LEAVING, event);
181 if (err)
182 goto out;
183 }
184
185 wdev->wext.prev_bssid_valid = false;
186 wdev->wext.connect.ssid = wdev->wext.ssid;
187 memcpy(wdev->wext.ssid, ssid, len);
188 wdev->wext.connect.ssid_len = len;
189
190 wdev->wext.connect.crypto.control_port = false;
191 wdev->wext.connect.crypto.control_port_ethertype =
192 cpu_to_be16(ETH_P_PAE);
193
194 err = cfg80211_mgd_wext_connect(rdev, wdev);
195 out:
196 wdev_unlock(wdev);
197 return err;
198 }
199
cfg80211_mgd_wext_giwessid(struct net_device * dev,struct iw_request_info * info,struct iw_point * data,char * ssid)200 int cfg80211_mgd_wext_giwessid(struct net_device *dev,
201 struct iw_request_info *info,
202 struct iw_point *data, char *ssid)
203 {
204 struct wireless_dev *wdev = dev->ieee80211_ptr;
205 int ret = 0;
206
207 /* call only for station! */
208 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
209 return -EINVAL;
210
211 data->flags = 0;
212
213 wdev_lock(wdev);
214 if (wdev->current_bss) {
215 const u8 *ie;
216
217 rcu_read_lock();
218 ie = ieee80211_bss_get_ie(&wdev->current_bss->pub,
219 WLAN_EID_SSID);
220 if (ie) {
221 data->flags = 1;
222 data->length = ie[1];
223 if (data->length > IW_ESSID_MAX_SIZE)
224 ret = -EINVAL;
225 else
226 memcpy(ssid, ie + 2, data->length);
227 }
228 rcu_read_unlock();
229 } else if (wdev->wext.connect.ssid && wdev->wext.connect.ssid_len) {
230 data->flags = 1;
231 data->length = wdev->wext.connect.ssid_len;
232 memcpy(ssid, wdev->wext.connect.ssid, data->length);
233 }
234 wdev_unlock(wdev);
235
236 return ret;
237 }
238
cfg80211_mgd_wext_siwap(struct net_device * dev,struct iw_request_info * info,struct sockaddr * ap_addr,char * extra)239 int cfg80211_mgd_wext_siwap(struct net_device *dev,
240 struct iw_request_info *info,
241 struct sockaddr *ap_addr, char *extra)
242 {
243 struct wireless_dev *wdev = dev->ieee80211_ptr;
244 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
245 u8 *bssid = ap_addr->sa_data;
246 int err;
247
248 /* call only for station! */
249 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
250 return -EINVAL;
251
252 if (ap_addr->sa_family != ARPHRD_ETHER)
253 return -EINVAL;
254
255 /* automatic mode */
256 if (is_zero_ether_addr(bssid) || is_broadcast_ether_addr(bssid))
257 bssid = NULL;
258
259 wdev_lock(wdev);
260
261 if (wdev->conn) {
262 err = 0;
263 /* both automatic */
264 if (!bssid && !wdev->wext.connect.bssid)
265 goto out;
266
267 /* fixed already - and no change */
268 if (wdev->wext.connect.bssid && bssid &&
269 ether_addr_equal(bssid, wdev->wext.connect.bssid))
270 goto out;
271
272 err = cfg80211_disconnect(rdev, dev,
273 WLAN_REASON_DEAUTH_LEAVING, false);
274 if (err)
275 goto out;
276 }
277
278 if (bssid) {
279 memcpy(wdev->wext.bssid, bssid, ETH_ALEN);
280 wdev->wext.connect.bssid = wdev->wext.bssid;
281 } else
282 wdev->wext.connect.bssid = NULL;
283
284 err = cfg80211_mgd_wext_connect(rdev, wdev);
285 out:
286 wdev_unlock(wdev);
287 return err;
288 }
289
cfg80211_mgd_wext_giwap(struct net_device * dev,struct iw_request_info * info,struct sockaddr * ap_addr,char * extra)290 int cfg80211_mgd_wext_giwap(struct net_device *dev,
291 struct iw_request_info *info,
292 struct sockaddr *ap_addr, char *extra)
293 {
294 struct wireless_dev *wdev = dev->ieee80211_ptr;
295
296 /* call only for station! */
297 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
298 return -EINVAL;
299
300 ap_addr->sa_family = ARPHRD_ETHER;
301
302 wdev_lock(wdev);
303 if (wdev->current_bss)
304 memcpy(ap_addr->sa_data, wdev->current_bss->pub.bssid, ETH_ALEN);
305 else
306 eth_zero_addr(ap_addr->sa_data);
307 wdev_unlock(wdev);
308
309 return 0;
310 }
311
cfg80211_wext_siwgenie(struct net_device * dev,struct iw_request_info * info,struct iw_point * data,char * extra)312 int cfg80211_wext_siwgenie(struct net_device *dev,
313 struct iw_request_info *info,
314 struct iw_point *data, char *extra)
315 {
316 struct wireless_dev *wdev = dev->ieee80211_ptr;
317 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
318 u8 *ie = extra;
319 int ie_len = data->length, err;
320
321 if (wdev->iftype != NL80211_IFTYPE_STATION)
322 return -EOPNOTSUPP;
323
324 if (!ie_len)
325 ie = NULL;
326
327 wdev_lock(wdev);
328
329 /* no change */
330 err = 0;
331 if (wdev->wext.ie_len == ie_len &&
332 memcmp(wdev->wext.ie, ie, ie_len) == 0)
333 goto out;
334
335 if (ie_len) {
336 ie = kmemdup(extra, ie_len, GFP_KERNEL);
337 if (!ie) {
338 err = -ENOMEM;
339 goto out;
340 }
341 } else
342 ie = NULL;
343
344 kfree(wdev->wext.ie);
345 wdev->wext.ie = ie;
346 wdev->wext.ie_len = ie_len;
347
348 if (wdev->conn) {
349 err = cfg80211_disconnect(rdev, dev,
350 WLAN_REASON_DEAUTH_LEAVING, false);
351 if (err)
352 goto out;
353 }
354
355 /* userspace better not think we'll reconnect */
356 err = 0;
357 out:
358 wdev_unlock(wdev);
359 return err;
360 }
361
cfg80211_wext_siwmlme(struct net_device * dev,struct iw_request_info * info,struct iw_point * data,char * extra)362 int cfg80211_wext_siwmlme(struct net_device *dev,
363 struct iw_request_info *info,
364 struct iw_point *data, char *extra)
365 {
366 struct wireless_dev *wdev = dev->ieee80211_ptr;
367 struct iw_mlme *mlme = (struct iw_mlme *)extra;
368 struct cfg80211_registered_device *rdev;
369 int err;
370
371 if (!wdev)
372 return -EOPNOTSUPP;
373
374 rdev = wiphy_to_rdev(wdev->wiphy);
375
376 if (wdev->iftype != NL80211_IFTYPE_STATION)
377 return -EINVAL;
378
379 if (mlme->addr.sa_family != ARPHRD_ETHER)
380 return -EINVAL;
381
382 wdev_lock(wdev);
383 switch (mlme->cmd) {
384 case IW_MLME_DEAUTH:
385 case IW_MLME_DISASSOC:
386 err = cfg80211_disconnect(rdev, dev, mlme->reason_code, true);
387 break;
388 default:
389 err = -EOPNOTSUPP;
390 break;
391 }
392 wdev_unlock(wdev);
393
394 return err;
395 }
396
