wext-sme.c

  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
 18int 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
 65int 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
109int 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
138int 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
187int 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
228int 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
273int 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
298int 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	int ie_len = data->length;
306	u8 *ie = extra;
307
308	if (wdev->iftype != NL80211_IFTYPE_STATION)
309		return -EOPNOTSUPP;
310
311	if (!ie_len)
312		ie = NULL;
313
314	guard(wiphy)(wdev->wiphy);
315
316	/* no change */
317	if (wdev->wext.ie_len == ie_len &&
318	    memcmp(wdev->wext.ie, ie, ie_len) == 0)
319		return 0;
320
321	if (ie_len) {
322		ie = kmemdup(extra, ie_len, GFP_KERNEL);
323		if (!ie)
324			return -ENOMEM;
325	} else {
326		ie = NULL;
327	}
328
329	kfree(wdev->wext.ie);
330	wdev->wext.ie = ie;
331	wdev->wext.ie_len = ie_len;
332
333	if (wdev->conn)
334		return cfg80211_disconnect(rdev, dev,
335					   WLAN_REASON_DEAUTH_LEAVING, false);
336
337	/* userspace better not think we'll reconnect */
338	return 0;
339}
340
341int cfg80211_wext_siwmlme(struct net_device *dev,
342			  struct iw_request_info *info,
343			  union iwreq_data *wrqu, char *extra)
344{
345	struct wireless_dev *wdev = dev->ieee80211_ptr;
346	struct iw_mlme *mlme = (struct iw_mlme *)extra;
347	struct cfg80211_registered_device *rdev;
348
349	if (!wdev)
350		return -EOPNOTSUPP;
351
352	rdev = wiphy_to_rdev(wdev->wiphy);
353
354	if (wdev->iftype != NL80211_IFTYPE_STATION)
355		return -EINVAL;
356
357	if (mlme->addr.sa_family != ARPHRD_ETHER)
358		return -EINVAL;
359
360	guard(wiphy)(&rdev->wiphy);
361
362	switch (mlme->cmd) {
363	case IW_MLME_DEAUTH:
364	case IW_MLME_DISASSOC:
365		return cfg80211_disconnect(rdev, dev, mlme->reason_code, true);
366	default:
367		return -EOPNOTSUPP;
368	}
369}