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, 2020-2023 Intel Corporation
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
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 lockdep_assert_wiphy(wdev->wiphy);
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 < 4; 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
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 if (wdev->conn) {
91 bool event = true;
92
93 if (wdev->wext.connect.channel == chan)
94 return 0;
95
96 /* if SSID set, we'll try right again, avoid event */
97 if (wdev->wext.connect.ssid_len)
98 event = false;
99 err = cfg80211_disconnect(rdev, dev,
100 WLAN_REASON_DEAUTH_LEAVING, event);
101 if (err)
102 return err;
103 }
104
105 wdev->wext.connect.channel = chan;
106 return cfg80211_mgd_wext_connect(rdev, wdev);
107 }
108
109 int cfg80211_mgd_wext_giwfreq(struct net_device *dev,
110 struct iw_request_info *info,
111 struct iw_freq *freq, char *extra)
112 {
113 struct wireless_dev *wdev = dev->ieee80211_ptr;
114 struct ieee80211_channel *chan = NULL;
115
116 /* call only for station! */
117 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
118 return -EINVAL;
119
120 if (wdev->valid_links)
121 return -EOPNOTSUPP;
122
123 if (wdev->links[0].client.current_bss)
124 chan = wdev->links[0].client.current_bss->pub.channel;
125 else if (wdev->wext.connect.channel)
126 chan = wdev->wext.connect.channel;
127
128 if (chan) {
129 freq->m = chan->center_freq;
130 freq->e = 6;
131 return 0;
132 }
133
134 /* no channel if not joining */
135 return -EINVAL;
136 }
137
138 int cfg80211_mgd_wext_siwessid(struct net_device *dev,
139 struct iw_request_info *info,
140 struct iw_point *data, char *ssid)
141 {
142 struct wireless_dev *wdev = dev->ieee80211_ptr;
143 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
144 size_t len = data->length;
145 int err;
146
147 /* call only for station! */
148 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
149 return -EINVAL;
150
151 if (!data->flags)
152 len = 0;
153
154 /* iwconfig uses nul termination in SSID.. */
155 if (len > 0 && ssid[len - 1] == '\0')
156 len--;
157
158 if (wdev->conn) {
159 bool event = true;
160
161 if (wdev->wext.connect.ssid && len &&
162 len == wdev->wext.connect.ssid_len &&
163 memcmp(wdev->wext.connect.ssid, ssid, len) == 0)
164 return 0;
165
166 /* if SSID set now, we'll try to connect, avoid event */
167 if (len)
168 event = false;
169 err = cfg80211_disconnect(rdev, dev,
170 WLAN_REASON_DEAUTH_LEAVING, event);
171 if (err)
172 return err;
173 }
174
175 wdev->wext.prev_bssid_valid = false;
176 wdev->wext.connect.ssid = wdev->wext.ssid;
177 memcpy(wdev->wext.ssid, ssid, len);
178 wdev->wext.connect.ssid_len = len;
179
180 wdev->wext.connect.crypto.control_port = false;
181 wdev->wext.connect.crypto.control_port_ethertype =
182 cpu_to_be16(ETH_P_PAE);
183
184 return cfg80211_mgd_wext_connect(rdev, wdev);
185 }
186
187 int cfg80211_mgd_wext_giwessid(struct net_device *dev,
188 struct iw_request_info *info,
189 struct iw_point *data, char *ssid)
190 {
191 struct wireless_dev *wdev = dev->ieee80211_ptr;
192 int ret = 0;
193
194 /* call only for station! */
195 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
196 return -EINVAL;
197
198 if (wdev->valid_links)
199 return -EINVAL;
200
201 data->flags = 0;
202
203 if (wdev->links[0].client.current_bss) {
204 const struct element *ssid_elem;
205
206 rcu_read_lock();
207 ssid_elem = ieee80211_bss_get_elem(
208 &wdev->links[0].client.current_bss->pub,
209 WLAN_EID_SSID);
210 if (ssid_elem) {
211 data->flags = 1;
212 data->length = ssid_elem->datalen;
213 if (data->length > IW_ESSID_MAX_SIZE)
214 ret = -EINVAL;
215 else
216 memcpy(ssid, ssid_elem->data, data->length);
217 }
218 rcu_read_unlock();
219 } else if (wdev->wext.connect.ssid && wdev->wext.connect.ssid_len) {
220 data->flags = 1;
221 data->length = wdev->wext.connect.ssid_len;
222 memcpy(ssid, wdev->wext.connect.ssid, data->length);
223 }
224
225 return ret;
226 }
227
228 int cfg80211_mgd_wext_siwap(struct net_device *dev,
229 struct iw_request_info *info,
230 struct sockaddr *ap_addr, char *extra)
231 {
232 struct wireless_dev *wdev = dev->ieee80211_ptr;
233 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
234 u8 *bssid = ap_addr->sa_data;
235 int err;
236
237 /* call only for station! */
238 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
239 return -EINVAL;
240
241 if (ap_addr->sa_family != ARPHRD_ETHER)
242 return -EINVAL;
243
244 /* automatic mode */
245 if (is_zero_ether_addr(bssid) || is_broadcast_ether_addr(bssid))
246 bssid = NULL;
247
248 if (wdev->conn) {
249 /* both automatic */
250 if (!bssid && !wdev->wext.connect.bssid)
251 return 0;
252
253 /* fixed already - and no change */
254 if (wdev->wext.connect.bssid && bssid &&
255 ether_addr_equal(bssid, wdev->wext.connect.bssid))
256 return 0;
257
258 err = cfg80211_disconnect(rdev, dev,
259 WLAN_REASON_DEAUTH_LEAVING, false);
260 if (err)
261 return err;
262 }
263
264 if (bssid) {
265 memcpy(wdev->wext.bssid, bssid, ETH_ALEN);
266 wdev->wext.connect.bssid = wdev->wext.bssid;
267 } else
268 wdev->wext.connect.bssid = NULL;
269
270 return cfg80211_mgd_wext_connect(rdev, wdev);
271 }
272
273 int cfg80211_mgd_wext_giwap(struct net_device *dev,
274 struct iw_request_info *info,
275 struct sockaddr *ap_addr, char *extra)
276 {
277 struct wireless_dev *wdev = dev->ieee80211_ptr;
278
279 /* call only for station! */
280 if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
281 return -EINVAL;
282
283 ap_addr->sa_family = ARPHRD_ETHER;
284
285 if (wdev->valid_links)
286 return -EOPNOTSUPP;
287
288 if (wdev->links[0].client.current_bss)
289 memcpy(ap_addr->sa_data,
290 wdev->links[0].client.current_bss->pub.bssid,
291 ETH_ALEN);
292 else
293 eth_zero_addr(ap_addr->sa_data);
294
295 return 0;
296 }
297
298 int cfg80211_wext_siwgenie(struct net_device *dev,
299 struct iw_request_info *info,
300 union iwreq_data *wrqu, char *extra)
301 {
302 struct iw_point *data = &wrqu->data;
303 struct wireless_dev *wdev = dev->ieee80211_ptr;
304 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
305 u8 *ie = extra;
306 int ie_len = data->length, err;
307
308 if (wdev->iftype != NL80211_IFTYPE_STATION)
309 return -EOPNOTSUPP;
310
311 if (!ie_len)
312 ie = NULL;
313
314 wiphy_lock(wdev->wiphy);
315
316 /* no change */
317 err = 0;
318 if (wdev->wext.ie_len == ie_len &&
319 memcmp(wdev->wext.ie, ie, ie_len) == 0)
320 goto out;
321
322 if (ie_len) {
323 ie = kmemdup(extra, ie_len, GFP_KERNEL);
324 if (!ie) {
325 err = -ENOMEM;
326 goto out;
327 }
328 } else
329 ie = NULL;
330
331 kfree(wdev->wext.ie);
332 wdev->wext.ie = ie;
333 wdev->wext.ie_len = ie_len;
334
335 if (wdev->conn) {
336 err = cfg80211_disconnect(rdev, dev,
337 WLAN_REASON_DEAUTH_LEAVING, false);
338 if (err)
339 goto out;
340 }
341
342 /* userspace better not think we'll reconnect */
343 err = 0;
344 out:
345 wiphy_unlock(wdev->wiphy);
346 return err;
347 }
348
349 int cfg80211_wext_siwmlme(struct net_device *dev,
350 struct iw_request_info *info,
351 union iwreq_data *wrqu, char *extra)
352 {
353 struct wireless_dev *wdev = dev->ieee80211_ptr;
354 struct iw_mlme *mlme = (struct iw_mlme *)extra;
355 struct cfg80211_registered_device *rdev;
356 int err;
357
358 if (!wdev)
359 return -EOPNOTSUPP;
360
361 rdev = wiphy_to_rdev(wdev->wiphy);
362
363 if (wdev->iftype != NL80211_IFTYPE_STATION)
364 return -EINVAL;
365
366 if (mlme->addr.sa_family != ARPHRD_ETHER)
367 return -EINVAL;
368
369 wiphy_lock(&rdev->wiphy);
370 switch (mlme->cmd) {
371 case IW_MLME_DEAUTH:
372 case IW_MLME_DISASSOC:
373 err = cfg80211_disconnect(rdev, dev, mlme->reason_code, true);
374 break;
375 default:
376 err = -EOPNOTSUPP;
377 break;
378 }
379 wiphy_unlock(&rdev->wiphy);
380
381 return err;
382 }
383
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