net/wireless/wext-sme.c

   1 /*
   2  * cfg80211 wext compat for managed mode.
   3  *
   4  * Copyright 2009       Johannes Berg <johannes@sipsolutions.net>
   5  * Copyright (C) 2009   Intel Corporation. All rights reserved.
   6  */
   7
   8 #include <linux/etherdevice.h>
   9 #include <linux/if_arp.h>
  10 #include <linux/slab.h>
  11 #include <net/cfg80211.h>
  12 #include "wext-compat.h"
  13 #include "nl80211.h"
  14
  15 int cfg80211_mgd_wext_connect(struct cfg80211_registered_device *rdev,
  16                               struct wireless_dev *wdev)
  17 {
  18         struct cfg80211_cached_keys *ck = NULL;
  19         const u8 *prev_bssid = NULL;
  20         int err, i;
  21
  22         ASSERT_RDEV_LOCK(rdev);
  23         ASSERT_WDEV_LOCK(wdev);
  24
  25         if (!netif_running(wdev->netdev))
  26                 return 0;
  27
  28         wdev->wext.connect.ie = wdev->wext.ie;
  29         wdev->wext.connect.ie_len = wdev->wext.ie_len;
  30
  31         if (wdev->wext.keys) {
  32                 wdev->wext.keys->def = wdev->wext.default_key;
  33                 wdev->wext.keys->defmgmt = wdev->wext.default_mgmt_key;
  34                 if (wdev->wext.default_key != -1)
  35                         wdev->wext.connect.privacy = true;
  36         }
  37
  38         if (!wdev->wext.connect.ssid_len)
  39                 return 0;
  40
  41         if (wdev->wext.keys) {
  42                 ck = kmemdup(wdev->wext.keys, sizeof(*ck), GFP_KERNEL);
  43                 if (!ck)
  44                         return -ENOMEM;
  45                 for (i = 0; i < 6; i++)
  46                         ck->params[i].key = ck->data[i];
  47         }
  48
  49         if (wdev->wext.prev_bssid_valid)
  50                 prev_bssid = wdev->wext.prev_bssid;
  51
  52         err = __cfg80211_connect(rdev, wdev->netdev,
  53                                  &wdev->wext.connect, ck, prev_bssid);
  54         if (err)
  55                 kfree(ck);
  56
  57         return err;
  58 }
  59
  60 int cfg80211_mgd_wext_siwfreq(struct net_device *dev,
  61                               struct iw_request_info *info,
  62                               struct iw_freq *wextfreq, char *extra)
  63 {
  64         struct wireless_dev *wdev = dev->ieee80211_ptr;
  65         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
  66         struct ieee80211_channel *chan = NULL;
  67         int err, freq;
  68
  69         /* call only for station! */
  70         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
  71                 return -EINVAL;
  72
  73         freq = cfg80211_wext_freq(wdev->wiphy, wextfreq);
  74         if (freq < 0)
  75                 return freq;
  76
  77         if (freq) {
  78                 chan = ieee80211_get_channel(wdev->wiphy, freq);
  79                 if (!chan)
  80                         return -EINVAL;
  81                 if (chan->flags & IEEE80211_CHAN_DISABLED)
  82                         return -EINVAL;
  83         }
  84
  85         cfg80211_lock_rdev(rdev);
  86         mutex_lock(&rdev->devlist_mtx);
  87         wdev_lock(wdev);
  88
  89         if (wdev->sme_state != CFG80211_SME_IDLE) {
  90                 bool event = true;
  91
  92                 if (wdev->wext.connect.channel == chan) {
  93                         err = 0;
  94                         goto out;
  95                 }
  96
  97                 /* if SSID set, we'll try right again, avoid event */
  98                 if (wdev->wext.connect.ssid_len)
  99                         event = false;
 100                 err = __cfg80211_disconnect(rdev, dev,
 101                                             WLAN_REASON_DEAUTH_LEAVING, event);
 102                 if (err)
 103                         goto out;
 104         }
 105
 106
 107         wdev->wext.connect.channel = chan;
 108
 109         /* SSID is not set, we just want to switch channel */
 110         if (chan && !wdev->wext.connect.ssid_len) {
 111                 err = cfg80211_set_freq(rdev, wdev, freq, NL80211_CHAN_NO_HT);
 112                 goto out;
 113         }
 114
 115         err = cfg80211_mgd_wext_connect(rdev, wdev);
 116  out:
 117         wdev_unlock(wdev);
 118         mutex_unlock(&rdev->devlist_mtx);
 119         cfg80211_unlock_rdev(rdev);
 120         return err;
 121 }
 122
 123 int cfg80211_mgd_wext_giwfreq(struct net_device *dev,
 124                               struct iw_request_info *info,
 125                               struct iw_freq *freq, char *extra)
 126 {
 127         struct wireless_dev *wdev = dev->ieee80211_ptr;
 128         struct ieee80211_channel *chan = NULL;
 129
 130         /* call only for station! */
 131         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
 132                 return -EINVAL;
 133
 134         wdev_lock(wdev);
 135         if (wdev->current_bss)
 136                 chan = wdev->current_bss->pub.channel;
 137         else if (wdev->wext.connect.channel)
 138                 chan = wdev->wext.connect.channel;
 139         wdev_unlock(wdev);
 140
 141         if (chan) {
 142                 freq->m = chan->center_freq;
 143                 freq->e = 6;
 144                 return 0;
 145         }
 146
 147         /* no channel if not joining */
 148         return -EINVAL;
 149 }
 150
 151 int cfg80211_mgd_wext_siwessid(struct net_device *dev,
 152                                struct iw_request_info *info,
 153                                struct iw_point *data, char *ssid)
 154 {
 155         struct wireless_dev *wdev = dev->ieee80211_ptr;
 156         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 157         size_t len = data->length;
 158         int err;
 159
 160         /* call only for station! */
 161         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
 162                 return -EINVAL;
 163
 164         if (!data->flags)
 165                 len = 0;
 166
 167         /* iwconfig uses nul termination in SSID.. */
 168         if (len > 0 && ssid[len - 1] == '\0')
 169                 len--;
 170
 171         cfg80211_lock_rdev(rdev);
 172         mutex_lock(&rdev->devlist_mtx);
 173         wdev_lock(wdev);
 174
 175         err = 0;
 176
 177         if (wdev->sme_state != CFG80211_SME_IDLE) {
 178                 bool event = true;
 179
 180                 if (wdev->wext.connect.ssid && len &&
 181                     len == wdev->wext.connect.ssid_len &&
 182                     memcmp(wdev->wext.connect.ssid, ssid, len) == 0)
 183                         goto out;
 184
 185                 /* if SSID set now, we'll try to connect, avoid event */
 186                 if (len)
 187                         event = false;
 188                 err = __cfg80211_disconnect(rdev, dev,
 189                                             WLAN_REASON_DEAUTH_LEAVING, event);
 190                 if (err)
 191                         goto out;
 192         }
 193
 194         wdev->wext.prev_bssid_valid = false;
 195         wdev->wext.connect.ssid = wdev->wext.ssid;
 196         memcpy(wdev->wext.ssid, ssid, len);
 197         wdev->wext.connect.ssid_len = len;
 198
 199         wdev->wext.connect.crypto.control_port = false;
 200
 201         err = cfg80211_mgd_wext_connect(rdev, wdev);
 202  out:
 203         wdev_unlock(wdev);
 204         mutex_unlock(&rdev->devlist_mtx);
 205         cfg80211_unlock_rdev(rdev);
 206         return err;
 207 }
 208
 209 int cfg80211_mgd_wext_giwessid(struct net_device *dev,
 210                                struct iw_request_info *info,
 211                                struct iw_point *data, char *ssid)
 212 {
 213         struct wireless_dev *wdev = dev->ieee80211_ptr;
 214
 215         /* call only for station! */
 216         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
 217                 return -EINVAL;
 218
 219         data->flags = 0;
 220
 221         wdev_lock(wdev);
 222         if (wdev->current_bss) {
 223                 const u8 *ie = ieee80211_bss_get_ie(&wdev->current_bss->pub,
 224                                                     WLAN_EID_SSID);
 225                 if (ie) {
 226                         data->flags = 1;
 227                         data->length = ie[1];
 228                         memcpy(ssid, ie + 2, data->length);
 229                 }
 230         } else if (wdev->wext.connect.ssid && wdev->wext.connect.ssid_len) {
 231                 data->flags = 1;
 232                 data->length = wdev->wext.connect.ssid_len;
 233                 memcpy(ssid, wdev->wext.connect.ssid, data->length);
 234         }
 235         wdev_unlock(wdev);
 236
 237         return 0;
 238 }
 239
 240 int cfg80211_mgd_wext_siwap(struct net_device *dev,
 241                             struct iw_request_info *info,
 242                             struct sockaddr *ap_addr, char *extra)
 243 {
 244         struct wireless_dev *wdev = dev->ieee80211_ptr;
 245         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 246         u8 *bssid = ap_addr->sa_data;
 247         int err;
 248
 249         /* call only for station! */
 250         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
 251                 return -EINVAL;
 252
 253         if (ap_addr->sa_family != ARPHRD_ETHER)
 254                 return -EINVAL;
 255
 256         /* automatic mode */
 257         if (is_zero_ether_addr(bssid) || is_broadcast_ether_addr(bssid))
 258                 bssid = NULL;
 259
 260         cfg80211_lock_rdev(rdev);
 261         mutex_lock(&rdev->devlist_mtx);
 262         wdev_lock(wdev);
 263
 264         if (wdev->sme_state != CFG80211_SME_IDLE) {
 265                 err = 0;
 266                 /* both automatic */
 267                 if (!bssid && !wdev->wext.connect.bssid)
 268                         goto out;
 269
 270                 /* fixed already - and no change */
 271                 if (wdev->wext.connect.bssid && bssid &&
 272                     compare_ether_addr(bssid, wdev->wext.connect.bssid) == 0)
 273                         goto out;
 274
 275                 err = __cfg80211_disconnect(rdev, dev,
 276                                             WLAN_REASON_DEAUTH_LEAVING, false);
 277                 if (err)
 278                         goto out;
 279         }
 280
 281         if (bssid) {
 282                 memcpy(wdev->wext.bssid, bssid, ETH_ALEN);
 283                 wdev->wext.connect.bssid = wdev->wext.bssid;
 284         } else
 285                 wdev->wext.connect.bssid = NULL;
 286
 287         err = cfg80211_mgd_wext_connect(rdev, wdev);
 288  out:
 289         wdev_unlock(wdev);
 290         mutex_unlock(&rdev->devlist_mtx);
 291         cfg80211_unlock_rdev(rdev);
 292         return err;
 293 }
 294
 295 int cfg80211_mgd_wext_giwap(struct net_device *dev,
 296                             struct iw_request_info *info,
 297                             struct sockaddr *ap_addr, char *extra)
 298 {
 299         struct wireless_dev *wdev = dev->ieee80211_ptr;
 300
 301         /* call only for station! */
 302         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
 303                 return -EINVAL;
 304
 305         ap_addr->sa_family = ARPHRD_ETHER;
 306
 307         wdev_lock(wdev);
 308         if (wdev->current_bss)
 309                 memcpy(ap_addr->sa_data, wdev->current_bss->pub.bssid, ETH_ALEN);
 310         else
 311                 memset(ap_addr->sa_data, 0, ETH_ALEN);
 312         wdev_unlock(wdev);
 313
 314         return 0;
 315 }
 316
 317 int cfg80211_wext_siwgenie(struct net_device *dev,
 318                            struct iw_request_info *info,
 319                            struct iw_point *data, char *extra)
 320 {
 321         struct wireless_dev *wdev = dev->ieee80211_ptr;
 322         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 323         u8 *ie = extra;
 324         int ie_len = data->length, err;
 325
 326         if (wdev->iftype != NL80211_IFTYPE_STATION)
 327                 return -EOPNOTSUPP;
 328
 329         if (!ie_len)
 330                 ie = NULL;
 331
 332         wdev_lock(wdev);
 333
 334         /* no change */
 335         err = 0;
 336         if (wdev->wext.ie_len == ie_len &&
 337             memcmp(wdev->wext.ie, ie, ie_len) == 0)
 338                 goto out;
 339
 340         if (ie_len) {
 341                 ie = kmemdup(extra, ie_len, GFP_KERNEL);
 342                 if (!ie) {
 343                         err = -ENOMEM;
 344                         goto out;
 345                 }
 346         } else
 347                 ie = NULL;
 348
 349         kfree(wdev->wext.ie);
 350         wdev->wext.ie = ie;
 351         wdev->wext.ie_len = ie_len;
 352
 353         if (wdev->sme_state != CFG80211_SME_IDLE) {
 354                 err = __cfg80211_disconnect(rdev, dev,
 355                                             WLAN_REASON_DEAUTH_LEAVING, false);
 356                 if (err)
 357                         goto out;
 358         }
 359
 360         /* userspace better not think we'll reconnect */
 361         err = 0;
 362  out:
 363         wdev_unlock(wdev);
 364         return err;
 365 }
 366 EXPORT_SYMBOL_GPL(cfg80211_wext_siwgenie);
 367
 368 int cfg80211_wext_siwmlme(struct net_device *dev,
 369                           struct iw_request_info *info,
 370                           struct iw_point *data, char *extra)
 371 {
 372         struct wireless_dev *wdev = dev->ieee80211_ptr;
 373         struct iw_mlme *mlme = (struct iw_mlme *)extra;
 374         struct cfg80211_registered_device *rdev;
 375         int err;
 376
 377         if (!wdev)
 378                 return -EOPNOTSUPP;
 379
 380         rdev = wiphy_to_dev(wdev->wiphy);
 381
 382         if (wdev->iftype != NL80211_IFTYPE_STATION)
 383                 return -EINVAL;
 384
 385         if (mlme->addr.sa_family != ARPHRD_ETHER)
 386                 return -EINVAL;
 387
 388         wdev_lock(wdev);
 389         switch (mlme->cmd) {
 390         case IW_MLME_DEAUTH:
 391         case IW_MLME_DISASSOC:
 392                 err = __cfg80211_disconnect(rdev, dev, mlme->reason_code,
 393                                             true);
 394                 break;
 395         default:
 396                 err = -EOPNOTSUPP;
 397                 break;
 398         }
 399         wdev_unlock(wdev);
 400
 401         return err;
 402 }
 403 EXPORT_SYMBOL_GPL(cfg80211_wext_siwmlme);