net/wireless/wext-sme.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * cfg80211 wext compat for managed mode.
   4  *
   5  * Copyright 2009       Johannes Berg <johannes@sipsolutions.net>
   6  * Copyright (C) 2009   Intel Corporation. All rights reserved.
   7  */
   8
   9 #include <linux/export.h>
  10 #include <linux/etherdevice.h>
  11 #include <linux/if_arp.h>
  12 #include <linux/slab.h>
  13 #include <net/cfg80211.h>
  14 #include <net/cfg80211-wext.h>
  15 #include "wext-compat.h"
  16 #include "nl80211.h"
  17
  18 int cfg80211_mgd_wext_connect(struct cfg80211_registered_device *rdev,
  19                               struct wireless_dev *wdev)
  20 {
  21         struct cfg80211_cached_keys *ck = NULL;
  22         const u8 *prev_bssid = NULL;
  23         int err, i;
  24
  25         ASSERT_RTNL();
  26         ASSERT_WDEV_LOCK(wdev);
  27
  28         if (!netif_running(wdev->netdev))
  29                 return 0;
  30
  31         wdev->wext.connect.ie = wdev->wext.ie;
  32         wdev->wext.connect.ie_len = wdev->wext.ie_len;
  33
  34         /* Use default background scan period */
  35         wdev->wext.connect.bg_scan_period = -1;
  36
  37         if (wdev->wext.keys) {
  38                 wdev->wext.keys->def = wdev->wext.default_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 && wdev->wext.keys->def != -1) {
  47                 ck = kmemdup(wdev->wext.keys, sizeof(*ck), GFP_KERNEL);
  48                 if (!ck)
  49                         return -ENOMEM;
  50                 for (i = 0; i < CFG80211_MAX_WEP_KEYS; 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                 kzfree(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_rdev(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(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         wdev_lock(wdev);
  91
  92         if (wdev->conn) {
  93                 bool event = true;
  94
  95                 if (wdev->wext.connect.channel == chan) {
  96                         err = 0;
  97                         goto out;
  98                 }
  99
 100                 /* if SSID set, we'll try right again, avoid event */
 101                 if (wdev->wext.connect.ssid_len)
 102                         event = false;
 103                 err = cfg80211_disconnect(rdev, dev,
 104                                           WLAN_REASON_DEAUTH_LEAVING, event);
 105                 if (err)
 106                         goto out;
 107         }
 108
 109         wdev->wext.connect.channel = chan;
 110         err = cfg80211_mgd_wext_connect(rdev, wdev);
 111  out:
 112         wdev_unlock(wdev);
 113         return err;
 114 }
 115
 116 int cfg80211_mgd_wext_giwfreq(struct net_device *dev,
 117                               struct iw_request_info *info,
 118                               struct iw_freq *freq, char *extra)
 119 {
 120         struct wireless_dev *wdev = dev->ieee80211_ptr;
 121         struct ieee80211_channel *chan = NULL;
 122
 123         /* call only for station! */
 124         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
 125                 return -EINVAL;
 126
 127         wdev_lock(wdev);
 128         if (wdev->current_bss)
 129                 chan = wdev->current_bss->pub.channel;
 130         else if (wdev->wext.connect.channel)
 131                 chan = wdev->wext.connect.channel;
 132         wdev_unlock(wdev);
 133
 134         if (chan) {
 135                 freq->m = chan->center_freq;
 136                 freq->e = 6;
 137                 return 0;
 138         }
 139
 140         /* no channel if not joining */
 141         return -EINVAL;
 142 }
 143
 144 int cfg80211_mgd_wext_siwessid(struct net_device *dev,
 145                                struct iw_request_info *info,
 146                                struct iw_point *data, char *ssid)
 147 {
 148         struct wireless_dev *wdev = dev->ieee80211_ptr;
 149         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 150         size_t len = data->length;
 151         int err;
 152
 153         /* call only for station! */
 154         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
 155                 return -EINVAL;
 156
 157         if (!data->flags)
 158                 len = 0;
 159
 160         /* iwconfig uses nul termination in SSID.. */
 161         if (len > 0 && ssid[len - 1] == '\0')
 162                 len--;
 163
 164         wdev_lock(wdev);
 165
 166         err = 0;
 167
 168         if (wdev->conn) {
 169                 bool event = true;
 170
 171                 if (wdev->wext.connect.ssid && len &&
 172                     len == wdev->wext.connect.ssid_len &&
 173                     memcmp(wdev->wext.connect.ssid, ssid, len) == 0)
 174                         goto out;
 175
 176                 /* if SSID set now, we'll try to connect, avoid event */
 177                 if (len)
 178                         event = false;
 179                 err = cfg80211_disconnect(rdev, dev,
 180                                           WLAN_REASON_DEAUTH_LEAVING, event);
 181                 if (err)
 182                         goto out;
 183         }
 184
 185         wdev->wext.prev_bssid_valid = false;
 186         wdev->wext.connect.ssid = wdev->wext.ssid;
 187         memcpy(wdev->wext.ssid, ssid, len);
 188         wdev->wext.connect.ssid_len = len;
 189
 190         wdev->wext.connect.crypto.control_port = false;
 191         wdev->wext.connect.crypto.control_port_ethertype =
 192                                         cpu_to_be16(ETH_P_PAE);
 193
 194         err = cfg80211_mgd_wext_connect(rdev, wdev);
 195  out:
 196         wdev_unlock(wdev);
 197         return err;
 198 }
 199
 200 int cfg80211_mgd_wext_giwessid(struct net_device *dev,
 201                                struct iw_request_info *info,
 202                                struct iw_point *data, char *ssid)
 203 {
 204         struct wireless_dev *wdev = dev->ieee80211_ptr;
 205
 206         /* call only for station! */
 207         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
 208                 return -EINVAL;
 209
 210         data->flags = 0;
 211
 212         wdev_lock(wdev);
 213         if (wdev->current_bss) {
 214                 const u8 *ie;
 215
 216                 rcu_read_lock();
 217                 ie = ieee80211_bss_get_ie(&wdev->current_bss->pub,
 218                                           WLAN_EID_SSID);
 219                 if (ie) {
 220                         data->flags = 1;
 221                         data->length = ie[1];
 222                         memcpy(ssid, ie + 2, data->length);
 223                 }
 224                 rcu_read_unlock();
 225         } else if (wdev->wext.connect.ssid && wdev->wext.connect.ssid_len) {
 226                 data->flags = 1;
 227                 data->length = wdev->wext.connect.ssid_len;
 228                 memcpy(ssid, wdev->wext.connect.ssid, data->length);
 229         }
 230         wdev_unlock(wdev);
 231
 232         return 0;
 233 }
 234
 235 int cfg80211_mgd_wext_siwap(struct net_device *dev,
 236                             struct iw_request_info *info,
 237                             struct sockaddr *ap_addr, char *extra)
 238 {
 239         struct wireless_dev *wdev = dev->ieee80211_ptr;
 240         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 241         u8 *bssid = ap_addr->sa_data;
 242         int err;
 243
 244         /* call only for station! */
 245         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
 246                 return -EINVAL;
 247
 248         if (ap_addr->sa_family != ARPHRD_ETHER)
 249                 return -EINVAL;
 250
 251         /* automatic mode */
 252         if (is_zero_ether_addr(bssid) || is_broadcast_ether_addr(bssid))
 253                 bssid = NULL;
 254
 255         wdev_lock(wdev);
 256
 257         if (wdev->conn) {
 258                 err = 0;
 259                 /* both automatic */
 260                 if (!bssid && !wdev->wext.connect.bssid)
 261                         goto out;
 262
 263                 /* fixed already - and no change */
 264                 if (wdev->wext.connect.bssid && bssid &&
 265                     ether_addr_equal(bssid, wdev->wext.connect.bssid))
 266                         goto out;
 267
 268                 err = cfg80211_disconnect(rdev, dev,
 269                                           WLAN_REASON_DEAUTH_LEAVING, false);
 270                 if (err)
 271                         goto out;
 272         }
 273
 274         if (bssid) {
 275                 memcpy(wdev->wext.bssid, bssid, ETH_ALEN);
 276                 wdev->wext.connect.bssid = wdev->wext.bssid;
 277         } else
 278                 wdev->wext.connect.bssid = NULL;
 279
 280         err = cfg80211_mgd_wext_connect(rdev, wdev);
 281  out:
 282         wdev_unlock(wdev);
 283         return err;
 284 }
 285
 286 int cfg80211_mgd_wext_giwap(struct net_device *dev,
 287                             struct iw_request_info *info,
 288                             struct sockaddr *ap_addr, char *extra)
 289 {
 290         struct wireless_dev *wdev = dev->ieee80211_ptr;
 291
 292         /* call only for station! */
 293         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
 294                 return -EINVAL;
 295
 296         ap_addr->sa_family = ARPHRD_ETHER;
 297
 298         wdev_lock(wdev);
 299         if (wdev->current_bss)
 300                 memcpy(ap_addr->sa_data, wdev->current_bss->pub.bssid, ETH_ALEN);
 301         else
 302                 eth_zero_addr(ap_addr->sa_data);
 303         wdev_unlock(wdev);
 304
 305         return 0;
 306 }
 307
 308 int cfg80211_wext_siwgenie(struct net_device *dev,
 309                            struct iw_request_info *info,
 310                            struct iw_point *data, char *extra)
 311 {
 312         struct wireless_dev *wdev = dev->ieee80211_ptr;
 313         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 314         u8 *ie = extra;
 315         int ie_len = data->length, err;
 316
 317         if (wdev->iftype != NL80211_IFTYPE_STATION)
 318                 return -EOPNOTSUPP;
 319
 320         if (!ie_len)
 321                 ie = NULL;
 322
 323         wdev_lock(wdev);
 324
 325         /* no change */
 326         err = 0;
 327         if (wdev->wext.ie_len == ie_len &&
 328             memcmp(wdev->wext.ie, ie, ie_len) == 0)
 329                 goto out;
 330
 331         if (ie_len) {
 332                 ie = kmemdup(extra, ie_len, GFP_KERNEL);
 333                 if (!ie) {
 334                         err = -ENOMEM;
 335                         goto out;
 336                 }
 337         } else
 338                 ie = NULL;
 339
 340         kfree(wdev->wext.ie);
 341         wdev->wext.ie = ie;
 342         wdev->wext.ie_len = ie_len;
 343
 344         if (wdev->conn) {
 345                 err = cfg80211_disconnect(rdev, dev,
 346                                           WLAN_REASON_DEAUTH_LEAVING, false);
 347                 if (err)
 348                         goto out;
 349         }
 350
 351         /* userspace better not think we'll reconnect */
 352         err = 0;
 353  out:
 354         wdev_unlock(wdev);
 355         return err;
 356 }
 357
 358 int cfg80211_wext_siwmlme(struct net_device *dev,
 359                           struct iw_request_info *info,
 360                           struct iw_point *data, char *extra)
 361 {
 362         struct wireless_dev *wdev = dev->ieee80211_ptr;
 363         struct iw_mlme *mlme = (struct iw_mlme *)extra;
 364         struct cfg80211_registered_device *rdev;
 365         int err;
 366
 367         if (!wdev)
 368                 return -EOPNOTSUPP;
 369
 370         rdev = wiphy_to_rdev(wdev->wiphy);
 371
 372         if (wdev->iftype != NL80211_IFTYPE_STATION)
 373                 return -EINVAL;
 374
 375         if (mlme->addr.sa_family != ARPHRD_ETHER)
 376                 return -EINVAL;
 377
 378         wdev_lock(wdev);
 379         switch (mlme->cmd) {
 380         case IW_MLME_DEAUTH:
 381         case IW_MLME_DISASSOC:
 382                 err = cfg80211_disconnect(rdev, dev, mlme->reason_code, true);
 383                 break;
 384         default:
 385                 err = -EOPNOTSUPP;
 386                 break;
 387         }
 388         wdev_unlock(wdev);
 389
 390         return err;
 391 }