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