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wext-sme.c
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1 /*
2  * cfg80211 wext compat for managed mode.
3  *
4  * Copyright 2009 Johannes Berg <[email protected]>
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 
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_RDEV_LOCK(rdev);
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  kfree(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_dev(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(wdev->wiphy, 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  cfg80211_lock_rdev(rdev);
91  mutex_lock(&rdev->devlist_mtx);
92  wdev_lock(wdev);
93 
94  if (wdev->sme_state != CFG80211_SME_IDLE) {
95  bool event = true;
96 
97  if (wdev->wext.connect.channel == chan) {
98  err = 0;
99  goto out;
100  }
101 
102  /* if SSID set, we'll try right again, avoid event */
103  if (wdev->wext.connect.ssid_len)
104  event = false;
105  err = __cfg80211_disconnect(rdev, dev,
106  WLAN_REASON_DEAUTH_LEAVING, event);
107  if (err)
108  goto out;
109  }
110 
111 
112  wdev->wext.connect.channel = chan;
113 
114  /*
115  * SSID is not set, we just want to switch monitor channel,
116  * this is really just backward compatibility, if the SSID
117  * is set then we use the channel to select the BSS to use
118  * to connect to instead. If we were connected on another
119  * channel we disconnected above and reconnect below.
120  */
121  if (chan && !wdev->wext.connect.ssid_len) {
122  err = cfg80211_set_monitor_channel(rdev, freq, NL80211_CHAN_NO_HT);
123  goto out;
124  }
125 
126  err = cfg80211_mgd_wext_connect(rdev, wdev);
127  out:
128  wdev_unlock(wdev);
129  mutex_unlock(&rdev->devlist_mtx);
130  cfg80211_unlock_rdev(rdev);
131  return err;
132 }
133 
134 int cfg80211_mgd_wext_giwfreq(struct net_device *dev,
135  struct iw_request_info *info,
136  struct iw_freq *freq, char *extra)
137 {
138  struct wireless_dev *wdev = dev->ieee80211_ptr;
139  struct ieee80211_channel *chan = NULL;
140 
141  /* call only for station! */
142  if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
143  return -EINVAL;
144 
145  wdev_lock(wdev);
146  if (wdev->current_bss)
147  chan = wdev->current_bss->pub.channel;
148  else if (wdev->wext.connect.channel)
149  chan = wdev->wext.connect.channel;
150  wdev_unlock(wdev);
151 
152  if (chan) {
153  freq->m = chan->center_freq;
154  freq->e = 6;
155  return 0;
156  }
157 
158  /* no channel if not joining */
159  return -EINVAL;
160 }
161 
162 int cfg80211_mgd_wext_siwessid(struct net_device *dev,
163  struct iw_request_info *info,
164  struct iw_point *data, char *ssid)
165 {
166  struct wireless_dev *wdev = dev->ieee80211_ptr;
167  struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
168  size_t len = data->length;
169  int err;
170 
171  /* call only for station! */
172  if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
173  return -EINVAL;
174 
175  if (!data->flags)
176  len = 0;
177 
178  /* iwconfig uses nul termination in SSID.. */
179  if (len > 0 && ssid[len - 1] == '\0')
180  len--;
181 
182  cfg80211_lock_rdev(rdev);
183  mutex_lock(&rdev->devlist_mtx);
184  wdev_lock(wdev);
185 
186  err = 0;
187 
188  if (wdev->sme_state != CFG80211_SME_IDLE) {
189  bool event = true;
190 
191  if (wdev->wext.connect.ssid && len &&
192  len == wdev->wext.connect.ssid_len &&
193  memcmp(wdev->wext.connect.ssid, ssid, len) == 0)
194  goto out;
195 
196  /* if SSID set now, we'll try to connect, avoid event */
197  if (len)
198  event = false;
199  err = __cfg80211_disconnect(rdev, dev,
200  WLAN_REASON_DEAUTH_LEAVING, event);
201  if (err)
202  goto out;
203  }
204 
205  wdev->wext.prev_bssid_valid = false;
206  wdev->wext.connect.ssid = wdev->wext.ssid;
207  memcpy(wdev->wext.ssid, ssid, len);
208  wdev->wext.connect.ssid_len = len;
209 
210  wdev->wext.connect.crypto.control_port = false;
211  wdev->wext.connect.crypto.control_port_ethertype =
212  cpu_to_be16(ETH_P_PAE);
213 
214  err = cfg80211_mgd_wext_connect(rdev, wdev);
215  out:
216  wdev_unlock(wdev);
217  mutex_unlock(&rdev->devlist_mtx);
218  cfg80211_unlock_rdev(rdev);
219  return err;
220 }
221 
222 int cfg80211_mgd_wext_giwessid(struct net_device *dev,
223  struct iw_request_info *info,
224  struct iw_point *data, char *ssid)
225 {
226  struct wireless_dev *wdev = dev->ieee80211_ptr;
227 
228  /* call only for station! */
229  if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
230  return -EINVAL;
231 
232  data->flags = 0;
233 
234  wdev_lock(wdev);
235  if (wdev->current_bss) {
236  const u8 *ie = ieee80211_bss_get_ie(&wdev->current_bss->pub,
237  WLAN_EID_SSID);
238  if (ie) {
239  data->flags = 1;
240  data->length = ie[1];
241  memcpy(ssid, ie + 2, data->length);
242  }
243  } else if (wdev->wext.connect.ssid && wdev->wext.connect.ssid_len) {
244  data->flags = 1;
245  data->length = wdev->wext.connect.ssid_len;
246  memcpy(ssid, wdev->wext.connect.ssid, data->length);
247  }
248  wdev_unlock(wdev);
249 
250  return 0;
251 }
252 
253 int cfg80211_mgd_wext_siwap(struct net_device *dev,
254  struct iw_request_info *info,
255  struct sockaddr *ap_addr, char *extra)
256 {
257  struct wireless_dev *wdev = dev->ieee80211_ptr;
258  struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
259  u8 *bssid = ap_addr->sa_data;
260  int err;
261 
262  /* call only for station! */
263  if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
264  return -EINVAL;
265 
266  if (ap_addr->sa_family != ARPHRD_ETHER)
267  return -EINVAL;
268 
269  /* automatic mode */
270  if (is_zero_ether_addr(bssid) || is_broadcast_ether_addr(bssid))
271  bssid = NULL;
272 
273  cfg80211_lock_rdev(rdev);
274  mutex_lock(&rdev->devlist_mtx);
275  wdev_lock(wdev);
276 
277  if (wdev->sme_state != CFG80211_SME_IDLE) {
278  err = 0;
279  /* both automatic */
280  if (!bssid && !wdev->wext.connect.bssid)
281  goto out;
282 
283  /* fixed already - and no change */
284  if (wdev->wext.connect.bssid && bssid &&
285  ether_addr_equal(bssid, wdev->wext.connect.bssid))
286  goto out;
287 
288  err = __cfg80211_disconnect(rdev, dev,
289  WLAN_REASON_DEAUTH_LEAVING, false);
290  if (err)
291  goto out;
292  }
293 
294  if (bssid) {
295  memcpy(wdev->wext.bssid, bssid, ETH_ALEN);
296  wdev->wext.connect.bssid = wdev->wext.bssid;
297  } else
298  wdev->wext.connect.bssid = NULL;
299 
300  err = cfg80211_mgd_wext_connect(rdev, wdev);
301  out:
302  wdev_unlock(wdev);
303  mutex_unlock(&rdev->devlist_mtx);
304  cfg80211_unlock_rdev(rdev);
305  return err;
306 }
307 
308 int cfg80211_mgd_wext_giwap(struct net_device *dev,
309  struct iw_request_info *info,
310  struct sockaddr *ap_addr, char *extra)
311 {
312  struct wireless_dev *wdev = dev->ieee80211_ptr;
313 
314  /* call only for station! */
315  if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
316  return -EINVAL;
317 
318  ap_addr->sa_family = ARPHRD_ETHER;
319 
320  wdev_lock(wdev);
321  if (wdev->current_bss)
322  memcpy(ap_addr->sa_data, wdev->current_bss->pub.bssid, ETH_ALEN);
323  else
324  memset(ap_addr->sa_data, 0, ETH_ALEN);
325  wdev_unlock(wdev);
326 
327  return 0;
328 }
329 
330 int cfg80211_wext_siwgenie(struct net_device *dev,
331  struct iw_request_info *info,
332  struct iw_point *data, char *extra)
333 {
334  struct wireless_dev *wdev = dev->ieee80211_ptr;
335  struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
336  u8 *ie = extra;
337  int ie_len = data->length, err;
338 
339  if (wdev->iftype != NL80211_IFTYPE_STATION)
340  return -EOPNOTSUPP;
341 
342  if (!ie_len)
343  ie = NULL;
344 
345  wdev_lock(wdev);
346 
347  /* no change */
348  err = 0;
349  if (wdev->wext.ie_len == ie_len &&
350  memcmp(wdev->wext.ie, ie, ie_len) == 0)
351  goto out;
352 
353  if (ie_len) {
354  ie = kmemdup(extra, ie_len, GFP_KERNEL);
355  if (!ie) {
356  err = -ENOMEM;
357  goto out;
358  }
359  } else
360  ie = NULL;
361 
362  kfree(wdev->wext.ie);
363  wdev->wext.ie = ie;
364  wdev->wext.ie_len = ie_len;
365 
366  if (wdev->sme_state != CFG80211_SME_IDLE) {
367  err = __cfg80211_disconnect(rdev, dev,
368  WLAN_REASON_DEAUTH_LEAVING, false);
369  if (err)
370  goto out;
371  }
372 
373  /* userspace better not think we'll reconnect */
374  err = 0;
375  out:
376  wdev_unlock(wdev);
377  return err;
378 }
379 
380 int cfg80211_wext_siwmlme(struct net_device *dev,
381  struct iw_request_info *info,
382  struct iw_point *data, char *extra)
383 {
384  struct wireless_dev *wdev = dev->ieee80211_ptr;
385  struct iw_mlme *mlme = (struct iw_mlme *)extra;
386  struct cfg80211_registered_device *rdev;
387  int err;
388 
389  if (!wdev)
390  return -EOPNOTSUPP;
391 
392  rdev = wiphy_to_dev(wdev->wiphy);
393 
394  if (wdev->iftype != NL80211_IFTYPE_STATION)
395  return -EINVAL;
396 
397  if (mlme->addr.sa_family != ARPHRD_ETHER)
398  return -EINVAL;
399 
400  wdev_lock(wdev);
401  switch (mlme->cmd) {
402  case IW_MLME_DEAUTH:
403  case IW_MLME_DISASSOC:
404  err = __cfg80211_disconnect(rdev, dev, mlme->reason_code,
405  true);
406  break;
407  default:
408  err = -EOPNOTSUPP;
409  break;
410  }
411  wdev_unlock(wdev);
412 
413  return err;
414 }
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