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/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         if (wdev->wext.keys) {
  34                 wdev->wext.keys->def = wdev->wext.default_key;
  35                 wdev->wext.keys->defmgmt = wdev->wext.default_mgmt_key;
  36                 if (wdev->wext.default_key != -1)
  37                         wdev->wext.connect.privacy = true;
  38         }
  39
  40         if (!wdev->wext.connect.ssid_len)
  41                 return 0;
  42
  43         if (wdev->wext.keys) {
  44                 ck = kmemdup(wdev->wext.keys, sizeof(*ck), GFP_KERNEL);
  45                 if (!ck)
  46                         return -ENOMEM;
  47                 for (i = 0; i < 6; i++)
  48                         ck->params[i].key = ck->data[i];
  49         }
  50
  51         if (wdev->wext.prev_bssid_valid)
  52                 prev_bssid = wdev->wext.prev_bssid;
  53
  54         err = __cfg80211_connect(rdev, wdev->netdev,
  55                                  &wdev->wext.connect, ck, prev_bssid);
  56         if (err)
  57                 kfree(ck);
  58
  59         return err;
  60 }
  61
  62 int cfg80211_mgd_wext_siwfreq(struct net_device *dev,
  63                               struct iw_request_info *info,
  64                               struct iw_freq *wextfreq, char *extra)
  65 {
  66         struct wireless_dev *wdev = dev->ieee80211_ptr;
  67         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
  68         struct ieee80211_channel *chan = NULL;
  69         int err, freq;
  70
  71         /* call only for station! */
  72         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
  73                 return -EINVAL;
  74
  75         freq = cfg80211_wext_freq(wdev->wiphy, wextfreq);
  76         if (freq < 0)
  77                 return freq;
  78
  79         if (freq) {
  80                 chan = ieee80211_get_channel(wdev->wiphy, freq);
  81                 if (!chan)
  82                         return -EINVAL;
  83                 if (chan->flags & IEEE80211_CHAN_DISABLED)
  84                         return -EINVAL;
  85         }
  86
  87         cfg80211_lock_rdev(rdev);
  88         mutex_lock(&rdev->devlist_mtx);
  89         wdev_lock(wdev);
  90
  91         if (wdev->sme_state != CFG80211_SME_IDLE) {
  92                 bool event = true;
  93
  94                 if (wdev->wext.connect.channel == chan) {
  95                         err = 0;
  96                         goto out;
  97                 }
  98
  99                 /* if SSID set, we'll try right again, avoid event */
 100                 if (wdev->wext.connect.ssid_len)
 101                         event = false;
 102                 err = __cfg80211_disconnect(rdev, dev,
 103                                             WLAN_REASON_DEAUTH_LEAVING, event);
 104                 if (err)
 105                         goto out;
 106         }
 107
 108
 109         wdev->wext.connect.channel = chan;
 110
 111         /* SSID is not set, we just want to switch channel */
 112         if (chan && !wdev->wext.connect.ssid_len) {
 113                 err = cfg80211_set_freq(rdev, wdev, freq, NL80211_CHAN_NO_HT);
 114                 goto out;
 115         }
 116
 117         err = cfg80211_mgd_wext_connect(rdev, wdev);
 118  out:
 119         wdev_unlock(wdev);
 120         mutex_unlock(&rdev->devlist_mtx);
 121         cfg80211_unlock_rdev(rdev);
 122         return err;
 123 }
 124
 125 int cfg80211_mgd_wext_giwfreq(struct net_device *dev,
 126                               struct iw_request_info *info,
 127                               struct iw_freq *freq, char *extra)
 128 {
 129         struct wireless_dev *wdev = dev->ieee80211_ptr;
 130         struct ieee80211_channel *chan = NULL;
 131
 132         /* call only for station! */
 133         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
 134                 return -EINVAL;
 135
 136         wdev_lock(wdev);
 137         if (wdev->current_bss)
 138                 chan = wdev->current_bss->pub.channel;
 139         else if (wdev->wext.connect.channel)
 140                 chan = wdev->wext.connect.channel;
 141         wdev_unlock(wdev);
 142
 143         if (chan) {
 144                 freq->m = chan->center_freq;
 145                 freq->e = 6;
 146                 return 0;
 147         }
 148
 149         /* no channel if not joining */
 150         return -EINVAL;
 151 }
 152
 153 int cfg80211_mgd_wext_siwessid(struct net_device *dev,
 154                                struct iw_request_info *info,
 155                                struct iw_point *data, char *ssid)
 156 {
 157         struct wireless_dev *wdev = dev->ieee80211_ptr;
 158         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 159         size_t len = data->length;
 160         int err;
 161
 162         /* call only for station! */
 163         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
 164                 return -EINVAL;
 165
 166         if (!data->flags)
 167                 len = 0;
 168
 169         /* iwconfig uses nul termination in SSID.. */
 170         if (len > 0 && ssid[len - 1] == '\0')
 171                 len--;
 172
 173         cfg80211_lock_rdev(rdev);
 174         mutex_lock(&rdev->devlist_mtx);
 175         wdev_lock(wdev);
 176
 177         err = 0;
 178
 179         if (wdev->sme_state != CFG80211_SME_IDLE) {
 180                 bool event = true;
 181
 182                 if (wdev->wext.connect.ssid && len &&
 183                     len == wdev->wext.connect.ssid_len &&
 184                     memcmp(wdev->wext.connect.ssid, ssid, len) == 0)
 185                         goto out;
 186
 187                 /* if SSID set now, we'll try to connect, avoid event */
 188                 if (len)
 189                         event = false;
 190                 err = __cfg80211_disconnect(rdev, dev,
 191                                             WLAN_REASON_DEAUTH_LEAVING, event);
 192                 if (err)
 193                         goto out;
 194         }
 195
 196         wdev->wext.prev_bssid_valid = false;
 197         wdev->wext.connect.ssid = wdev->wext.ssid;
 198         memcpy(wdev->wext.ssid, ssid, len);
 199         wdev->wext.connect.ssid_len = len;
 200
 201         wdev->wext.connect.crypto.control_port = false;
 202         wdev->wext.connect.crypto.control_port_ethertype =
 203                                         cpu_to_be16(ETH_P_PAE);
 204
 205         err = cfg80211_mgd_wext_connect(rdev, wdev);
 206  out:
 207         wdev_unlock(wdev);
 208         mutex_unlock(&rdev->devlist_mtx);
 209         cfg80211_unlock_rdev(rdev);
 210         return err;
 211 }
 212
 213 int cfg80211_mgd_wext_giwessid(struct net_device *dev,
 214                                struct iw_request_info *info,
 215                                struct iw_point *data, char *ssid)
 216 {
 217         struct wireless_dev *wdev = dev->ieee80211_ptr;
 218
 219         /* call only for station! */
 220         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
 221                 return -EINVAL;
 222
 223         data->flags = 0;
 224
 225         wdev_lock(wdev);
 226         if (wdev->current_bss) {
 227                 const u8 *ie = ieee80211_bss_get_ie(&wdev->current_bss->pub,
 228                                                     WLAN_EID_SSID);
 229                 if (ie) {
 230                         data->flags = 1;
 231                         data->length = ie[1];
 232                         memcpy(ssid, ie + 2, data->length);
 233                 }
 234         } else if (wdev->wext.connect.ssid && wdev->wext.connect.ssid_len) {
 235                 data->flags = 1;
 236                 data->length = wdev->wext.connect.ssid_len;
 237                 memcpy(ssid, wdev->wext.connect.ssid, data->length);
 238         }
 239         wdev_unlock(wdev);
 240
 241         return 0;
 242 }
 243
 244 int cfg80211_mgd_wext_siwap(struct net_device *dev,
 245                             struct iw_request_info *info,
 246                             struct sockaddr *ap_addr, char *extra)
 247 {
 248         struct wireless_dev *wdev = dev->ieee80211_ptr;
 249         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 250         u8 *bssid = ap_addr->sa_data;
 251         int err;
 252
 253         /* call only for station! */
 254         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
 255                 return -EINVAL;
 256
 257         if (ap_addr->sa_family != ARPHRD_ETHER)
 258                 return -EINVAL;
 259
 260         /* automatic mode */
 261         if (is_zero_ether_addr(bssid) || is_broadcast_ether_addr(bssid))
 262                 bssid = NULL;
 263
 264         cfg80211_lock_rdev(rdev);
 265         mutex_lock(&rdev->devlist_mtx);
 266         wdev_lock(wdev);
 267
 268         if (wdev->sme_state != CFG80211_SME_IDLE) {
 269                 err = 0;
 270                 /* both automatic */
 271                 if (!bssid && !wdev->wext.connect.bssid)
 272                         goto out;
 273
 274                 /* fixed already - and no change */
 275                 if (wdev->wext.connect.bssid && bssid &&
 276                     compare_ether_addr(bssid, wdev->wext.connect.bssid) == 0)
 277                         goto out;
 278
 279                 err = __cfg80211_disconnect(rdev, dev,
 280                                             WLAN_REASON_DEAUTH_LEAVING, false);
 281                 if (err)
 282                         goto out;
 283         }
 284
 285         if (bssid) {
 286                 memcpy(wdev->wext.bssid, bssid, ETH_ALEN);
 287                 wdev->wext.connect.bssid = wdev->wext.bssid;
 288         } else
 289                 wdev->wext.connect.bssid = NULL;
 290
 291         err = cfg80211_mgd_wext_connect(rdev, wdev);
 292  out:
 293         wdev_unlock(wdev);
 294         mutex_unlock(&rdev->devlist_mtx);
 295         cfg80211_unlock_rdev(rdev);
 296         return err;
 297 }
 298
 299 int cfg80211_mgd_wext_giwap(struct net_device *dev,
 300                             struct iw_request_info *info,
 301                             struct sockaddr *ap_addr, char *extra)
 302 {
 303         struct wireless_dev *wdev = dev->ieee80211_ptr;
 304
 305         /* call only for station! */
 306         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
 307                 return -EINVAL;
 308
 309         ap_addr->sa_family = ARPHRD_ETHER;
 310
 311         wdev_lock(wdev);
 312         if (wdev->current_bss)
 313                 memcpy(ap_addr->sa_data, wdev->current_bss->pub.bssid, ETH_ALEN);
 314         else
 315                 memset(ap_addr->sa_data, 0, ETH_ALEN);
 316         wdev_unlock(wdev);
 317
 318         return 0;
 319 }
 320
 321 int cfg80211_wext_siwgenie(struct net_device *dev,
 322                            struct iw_request_info *info,
 323                            struct iw_point *data, char *extra)
 324 {
 325         struct wireless_dev *wdev = dev->ieee80211_ptr;
 326         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 327         u8 *ie = extra;
 328         int ie_len = data->length, err;
 329
 330         if (wdev->iftype != NL80211_IFTYPE_STATION)
 331                 return -EOPNOTSUPP;
 332
 333         if (!ie_len)
 334                 ie = NULL;
 335
 336         wdev_lock(wdev);
 337
 338         /* no change */
 339         err = 0;
 340         if (wdev->wext.ie_len == ie_len &&
 341             memcmp(wdev->wext.ie, ie, ie_len) == 0)
 342                 goto out;
 343
 344         if (ie_len) {
 345                 ie = kmemdup(extra, ie_len, GFP_KERNEL);
 346                 if (!ie) {
 347                         err = -ENOMEM;
 348                         goto out;
 349                 }
 350         } else
 351                 ie = NULL;
 352
 353         kfree(wdev->wext.ie);
 354         wdev->wext.ie = ie;
 355         wdev->wext.ie_len = ie_len;
 356
 357         if (wdev->sme_state != CFG80211_SME_IDLE) {
 358                 err = __cfg80211_disconnect(rdev, dev,
 359                                             WLAN_REASON_DEAUTH_LEAVING, false);
 360                 if (err)
 361                         goto out;
 362         }
 363
 364         /* userspace better not think we'll reconnect */
 365         err = 0;
 366  out:
 367         wdev_unlock(wdev);
 368         return err;
 369 }
 370
 371 int cfg80211_wext_siwmlme(struct net_device *dev,
 372                           struct iw_request_info *info,
 373                           struct iw_point *data, char *extra)
 374 {
 375         struct wireless_dev *wdev = dev->ieee80211_ptr;
 376         struct iw_mlme *mlme = (struct iw_mlme *)extra;
 377         struct cfg80211_registered_device *rdev;
 378         int err;
 379
 380         if (!wdev)
 381                 return -EOPNOTSUPP;
 382
 383         rdev = wiphy_to_dev(wdev->wiphy);
 384
 385         if (wdev->iftype != NL80211_IFTYPE_STATION)
 386                 return -EINVAL;
 387
 388         if (mlme->addr.sa_family != ARPHRD_ETHER)
 389                 return -EINVAL;
 390
 391         wdev_lock(wdev);
 392         switch (mlme->cmd) {
 393         case IW_MLME_DEAUTH:
 394         case IW_MLME_DISASSOC:
 395                 err = __cfg80211_disconnect(rdev, dev, mlme->reason_code,
 396                                             true);
 397                 break;
 398         default:
 399                 err = -EOPNOTSUPP;
 400                 break;
 401         }
 402         wdev_unlock(wdev);
 403
 404         return err;
 405 }