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_RTNL();
  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                 if (wdev->wext.default_key != -1)
  39                         wdev->wext.connect.privacy = true;
  40         }
  41
  42         if (!wdev->wext.connect.ssid_len)
  43                 return 0;
  44
  45         if (wdev->wext.keys) {
  46                 ck = kmemdup(wdev->wext.keys, sizeof(*ck), GFP_KERNEL);
  47                 if (!ck)
  48                         return -ENOMEM;
  49                 for (i = 0; i < 4; i++)
  50                         ck->params[i].key = ck->data[i];
  51         }
  52
  53         if (wdev->wext.prev_bssid_valid)
  54                 prev_bssid = wdev->wext.prev_bssid;
  55
  56         err = cfg80211_connect(rdev, wdev->netdev,
  57                                &wdev->wext.connect, ck, prev_bssid);
  58         if (err)
  59                 kzfree(ck);
  60
  61         return err;
  62 }
  63
  64 int cfg80211_mgd_wext_siwfreq(struct net_device *dev,
  65                               struct iw_request_info *info,
  66                               struct iw_freq *wextfreq, char *extra)
  67 {
  68         struct wireless_dev *wdev = dev->ieee80211_ptr;
  69         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
  70         struct ieee80211_channel *chan = NULL;
  71         int err, freq;
  72
  73         /* call only for station! */
  74         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
  75                 return -EINVAL;
  76
  77         freq = cfg80211_wext_freq(wextfreq);
  78         if (freq < 0)
  79                 return freq;
  80
  81         if (freq) {
  82                 chan = ieee80211_get_channel(wdev->wiphy, freq);
  83                 if (!chan)
  84                         return -EINVAL;
  85                 if (chan->flags & IEEE80211_CHAN_DISABLED)
  86                         return -EINVAL;
  87         }
  88
  89         wdev_lock(wdev);
  90
  91         if (wdev->conn) {
  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         /*
 112          * SSID is not set, we just want to switch monitor channel,
 113          * this is really just backward compatibility, if the SSID
 114          * is set then we use the channel to select the BSS to use
 115          * to connect to instead. If we were connected on another
 116          * channel we disconnected above and reconnect below.
 117          */
 118         if (chan && !wdev->wext.connect.ssid_len) {
 119                 struct cfg80211_chan_def chandef = {
 120                         .width = NL80211_CHAN_WIDTH_20_NOHT,
 121                         .center_freq1 = freq,
 122                 };
 123
 124                 chandef.chan = ieee80211_get_channel(&rdev->wiphy, freq);
 125                 if (chandef.chan)
 126                         err = cfg80211_set_monitor_channel(rdev, &chandef);
 127                 else
 128                         err = -EINVAL;
 129                 goto out;
 130         }
 131
 132         err = cfg80211_mgd_wext_connect(rdev, wdev);
 133  out:
 134         wdev_unlock(wdev);
 135         return err;
 136 }
 137
 138 int cfg80211_mgd_wext_giwfreq(struct net_device *dev,
 139                               struct iw_request_info *info,
 140                               struct iw_freq *freq, char *extra)
 141 {
 142         struct wireless_dev *wdev = dev->ieee80211_ptr;
 143         struct ieee80211_channel *chan = NULL;
 144
 145         /* call only for station! */
 146         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
 147                 return -EINVAL;
 148
 149         wdev_lock(wdev);
 150         if (wdev->current_bss)
 151                 chan = wdev->current_bss->pub.channel;
 152         else if (wdev->wext.connect.channel)
 153                 chan = wdev->wext.connect.channel;
 154         wdev_unlock(wdev);
 155
 156         if (chan) {
 157                 freq->m = chan->center_freq;
 158                 freq->e = 6;
 159                 return 0;
 160         }
 161
 162         /* no channel if not joining */
 163         return -EINVAL;
 164 }
 165
 166 int cfg80211_mgd_wext_siwessid(struct net_device *dev,
 167                                struct iw_request_info *info,
 168                                struct iw_point *data, char *ssid)
 169 {
 170         struct wireless_dev *wdev = dev->ieee80211_ptr;
 171         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 172         size_t len = data->length;
 173         int err;
 174
 175         /* call only for station! */
 176         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
 177                 return -EINVAL;
 178
 179         if (!data->flags)
 180                 len = 0;
 181
 182         /* iwconfig uses nul termination in SSID.. */
 183         if (len > 0 && ssid[len - 1] == '\0')
 184                 len--;
 185
 186         wdev_lock(wdev);
 187
 188         err = 0;
 189
 190         if (wdev->conn) {
 191                 bool event = true;
 192
 193                 if (wdev->wext.connect.ssid && len &&
 194                     len == wdev->wext.connect.ssid_len &&
 195                     memcmp(wdev->wext.connect.ssid, ssid, len) == 0)
 196                         goto out;
 197
 198                 /* if SSID set now, we'll try to connect, avoid event */
 199                 if (len)
 200                         event = false;
 201                 err = cfg80211_disconnect(rdev, dev,
 202                                           WLAN_REASON_DEAUTH_LEAVING, event);
 203                 if (err)
 204                         goto out;
 205         }
 206
 207         wdev->wext.prev_bssid_valid = false;
 208         wdev->wext.connect.ssid = wdev->wext.ssid;
 209         memcpy(wdev->wext.ssid, ssid, len);
 210         wdev->wext.connect.ssid_len = len;
 211
 212         wdev->wext.connect.crypto.control_port = false;
 213         wdev->wext.connect.crypto.control_port_ethertype =
 214                                         cpu_to_be16(ETH_P_PAE);
 215
 216         err = cfg80211_mgd_wext_connect(rdev, wdev);
 217  out:
 218         wdev_unlock(wdev);
 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;
 237
 238                 rcu_read_lock();
 239                 ie = ieee80211_bss_get_ie(&wdev->current_bss->pub,
 240                                           WLAN_EID_SSID);
 241                 if (ie) {
 242                         data->flags = 1;
 243                         data->length = ie[1];
 244                         memcpy(ssid, ie + 2, data->length);
 245                 }
 246                 rcu_read_unlock();
 247         } else if (wdev->wext.connect.ssid && wdev->wext.connect.ssid_len) {
 248                 data->flags = 1;
 249                 data->length = wdev->wext.connect.ssid_len;
 250                 memcpy(ssid, wdev->wext.connect.ssid, data->length);
 251         }
 252         wdev_unlock(wdev);
 253
 254         return 0;
 255 }
 256
 257 int cfg80211_mgd_wext_siwap(struct net_device *dev,
 258                             struct iw_request_info *info,
 259                             struct sockaddr *ap_addr, char *extra)
 260 {
 261         struct wireless_dev *wdev = dev->ieee80211_ptr;
 262         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 263         u8 *bssid = ap_addr->sa_data;
 264         int err;
 265
 266         /* call only for station! */
 267         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
 268                 return -EINVAL;
 269
 270         if (ap_addr->sa_family != ARPHRD_ETHER)
 271                 return -EINVAL;
 272
 273         /* automatic mode */
 274         if (is_zero_ether_addr(bssid) || is_broadcast_ether_addr(bssid))
 275                 bssid = NULL;
 276
 277         wdev_lock(wdev);
 278
 279         if (wdev->conn) {
 280                 err = 0;
 281                 /* both automatic */
 282                 if (!bssid && !wdev->wext.connect.bssid)
 283                         goto out;
 284
 285                 /* fixed already - and no change */
 286                 if (wdev->wext.connect.bssid && bssid &&
 287                     ether_addr_equal(bssid, wdev->wext.connect.bssid))
 288                         goto out;
 289
 290                 err = cfg80211_disconnect(rdev, dev,
 291                                           WLAN_REASON_DEAUTH_LEAVING, false);
 292                 if (err)
 293                         goto out;
 294         }
 295
 296         if (bssid) {
 297                 memcpy(wdev->wext.bssid, bssid, ETH_ALEN);
 298                 wdev->wext.connect.bssid = wdev->wext.bssid;
 299         } else
 300                 wdev->wext.connect.bssid = NULL;
 301
 302         err = cfg80211_mgd_wext_connect(rdev, wdev);
 303  out:
 304         wdev_unlock(wdev);
 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                 eth_zero_addr(ap_addr->sa_data);
 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_rdev(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->conn) {
 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_rdev(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, true);
 405                 break;
 406         default:
 407                 err = -EOPNOTSUPP;
 408                 break;
 409         }
 410         wdev_unlock(wdev);
 411
 412         return err;
 413 }