xref: /linux/net/wireless/wext-sme.c (revision 0ea5c948cb64bab5bc7a5516774eb8536f05aa0d)
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 
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 	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 
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 	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 
cfg80211_mgd_wext_giwfreq(struct net_device * dev,struct iw_request_info * info,struct iw_freq * freq,char * extra)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 
cfg80211_mgd_wext_siwessid(struct net_device * dev,struct iw_request_info * info,struct iw_point * data,char * ssid)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 
cfg80211_mgd_wext_giwessid(struct net_device * dev,struct iw_request_info * info,struct iw_point * data,char * ssid)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 
cfg80211_mgd_wext_siwap(struct net_device * dev,struct iw_request_info * info,struct sockaddr * ap_addr,char * extra)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 
cfg80211_mgd_wext_giwap(struct net_device * dev,struct iw_request_info * info,struct sockaddr * ap_addr,char * extra)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 
cfg80211_wext_siwgenie(struct net_device * dev,struct iw_request_info * info,union iwreq_data * wrqu,char * extra)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 
cfg80211_wext_siwmlme(struct net_device * dev,struct iw_request_info * info,union iwreq_data * wrqu,char * extra)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