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         /* 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 }