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, 2020-2022 Intel Corporation
   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                 kfree_sensitive(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         if (wdev->valid_links)
 128                 return -EOPNOTSUPP;
 129
 130         wdev_lock(wdev);
 131         if (wdev->links[0].client.current_bss)
 132                 chan = wdev->links[0].client.current_bss->pub.channel;
 133         else if (wdev->wext.connect.channel)
 134                 chan = wdev->wext.connect.channel;
 135         wdev_unlock(wdev);
 136
 137         if (chan) {
 138                 freq->m = chan->center_freq;
 139                 freq->e = 6;
 140                 return 0;
 141         }
 142
 143         /* no channel if not joining */
 144         return -EINVAL;
 145 }
 146
 147 int cfg80211_mgd_wext_siwessid(struct net_device *dev,
 148                                struct iw_request_info *info,
 149                                struct iw_point *data, char *ssid)
 150 {
 151         struct wireless_dev *wdev = dev->ieee80211_ptr;
 152         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 153         size_t len = data->length;
 154         int err;
 155
 156         /* call only for station! */
 157         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
 158                 return -EINVAL;
 159
 160         if (!data->flags)
 161                 len = 0;
 162
 163         /* iwconfig uses nul termination in SSID.. */
 164         if (len > 0 && ssid[len - 1] == '\0')
 165                 len--;
 166
 167         wdev_lock(wdev);
 168
 169         err = 0;
 170
 171         if (wdev->conn) {
 172                 bool event = true;
 173
 174                 if (wdev->wext.connect.ssid && len &&
 175                     len == wdev->wext.connect.ssid_len &&
 176                     memcmp(wdev->wext.connect.ssid, ssid, len) == 0)
 177                         goto out;
 178
 179                 /* if SSID set now, we'll try to connect, avoid event */
 180                 if (len)
 181                         event = false;
 182                 err = cfg80211_disconnect(rdev, dev,
 183                                           WLAN_REASON_DEAUTH_LEAVING, event);
 184                 if (err)
 185                         goto out;
 186         }
 187
 188         wdev->wext.prev_bssid_valid = false;
 189         wdev->wext.connect.ssid = wdev->wext.ssid;
 190         memcpy(wdev->wext.ssid, ssid, len);
 191         wdev->wext.connect.ssid_len = len;
 192
 193         wdev->wext.connect.crypto.control_port = false;
 194         wdev->wext.connect.crypto.control_port_ethertype =
 195                                         cpu_to_be16(ETH_P_PAE);
 196
 197         err = cfg80211_mgd_wext_connect(rdev, wdev);
 198  out:
 199         wdev_unlock(wdev);
 200         return err;
 201 }
 202
 203 int cfg80211_mgd_wext_giwessid(struct net_device *dev,
 204                                struct iw_request_info *info,
 205                                struct iw_point *data, char *ssid)
 206 {
 207         struct wireless_dev *wdev = dev->ieee80211_ptr;
 208         int ret = 0;
 209
 210         /* call only for station! */
 211         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
 212                 return -EINVAL;
 213
 214         if (wdev->valid_links)
 215                 return -EINVAL;
 216
 217         data->flags = 0;
 218
 219         wdev_lock(wdev);
 220         if (wdev->links[0].client.current_bss) {
 221                 const struct element *ssid_elem;
 222
 223                 rcu_read_lock();
 224                 ssid_elem = ieee80211_bss_get_elem(
 225                                 &wdev->links[0].client.current_bss->pub,
 226                                 WLAN_EID_SSID);
 227                 if (ssid_elem) {
 228                         data->flags = 1;
 229                         data->length = ssid_elem->datalen;
 230                         if (data->length > IW_ESSID_MAX_SIZE)
 231                                 ret = -EINVAL;
 232                         else
 233                                 memcpy(ssid, ssid_elem->data, data->length);
 234                 }
 235                 rcu_read_unlock();
 236         } else if (wdev->wext.connect.ssid && wdev->wext.connect.ssid_len) {
 237                 data->flags = 1;
 238                 data->length = wdev->wext.connect.ssid_len;
 239                 memcpy(ssid, wdev->wext.connect.ssid, data->length);
 240         }
 241         wdev_unlock(wdev);
 242
 243         return ret;
 244 }
 245
 246 int cfg80211_mgd_wext_siwap(struct net_device *dev,
 247                             struct iw_request_info *info,
 248                             struct sockaddr *ap_addr, char *extra)
 249 {
 250         struct wireless_dev *wdev = dev->ieee80211_ptr;
 251         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 252         u8 *bssid = ap_addr->sa_data;
 253         int err;
 254
 255         /* call only for station! */
 256         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
 257                 return -EINVAL;
 258
 259         if (ap_addr->sa_family != ARPHRD_ETHER)
 260                 return -EINVAL;
 261
 262         /* automatic mode */
 263         if (is_zero_ether_addr(bssid) || is_broadcast_ether_addr(bssid))
 264                 bssid = NULL;
 265
 266         wdev_lock(wdev);
 267
 268         if (wdev->conn) {
 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                     ether_addr_equal(bssid, wdev->wext.connect.bssid))
 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         return err;
 295 }
 296
 297 int cfg80211_mgd_wext_giwap(struct net_device *dev,
 298                             struct iw_request_info *info,
 299                             struct sockaddr *ap_addr, char *extra)
 300 {
 301         struct wireless_dev *wdev = dev->ieee80211_ptr;
 302
 303         /* call only for station! */
 304         if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
 305                 return -EINVAL;
 306
 307         ap_addr->sa_family = ARPHRD_ETHER;
 308
 309         wdev_lock(wdev);
 310         if (wdev->valid_links) {
 311                 wdev_unlock(wdev);
 312                 return -EOPNOTSUPP;
 313         }
 314         if (wdev->links[0].client.current_bss)
 315                 memcpy(ap_addr->sa_data,
 316                        wdev->links[0].client.current_bss->pub.bssid,
 317                        ETH_ALEN);
 318         else
 319                 eth_zero_addr(ap_addr->sa_data);
 320         wdev_unlock(wdev);
 321
 322         return 0;
 323 }
 324
 325 int cfg80211_wext_siwgenie(struct net_device *dev,
 326                            struct iw_request_info *info,
 327                            struct iw_point *data, char *extra)
 328 {
 329         struct wireless_dev *wdev = dev->ieee80211_ptr;
 330         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 331         u8 *ie = extra;
 332         int ie_len = data->length, err;
 333
 334         if (wdev->iftype != NL80211_IFTYPE_STATION)
 335                 return -EOPNOTSUPP;
 336
 337         if (!ie_len)
 338                 ie = NULL;
 339
 340         wdev_lock(wdev);
 341
 342         /* no change */
 343         err = 0;
 344         if (wdev->wext.ie_len == ie_len &&
 345             memcmp(wdev->wext.ie, ie, ie_len) == 0)
 346                 goto out;
 347
 348         if (ie_len) {
 349                 ie = kmemdup(extra, ie_len, GFP_KERNEL);
 350                 if (!ie) {
 351                         err = -ENOMEM;
 352                         goto out;
 353                 }
 354         } else
 355                 ie = NULL;
 356
 357         kfree(wdev->wext.ie);
 358         wdev->wext.ie = ie;
 359         wdev->wext.ie_len = ie_len;
 360
 361         if (wdev->conn) {
 362                 err = cfg80211_disconnect(rdev, dev,
 363                                           WLAN_REASON_DEAUTH_LEAVING, false);
 364                 if (err)
 365                         goto out;
 366         }
 367
 368         /* userspace better not think we'll reconnect */
 369         err = 0;
 370  out:
 371         wdev_unlock(wdev);
 372         return err;
 373 }
 374
 375 int cfg80211_wext_siwmlme(struct net_device *dev,
 376                           struct iw_request_info *info,
 377                           struct iw_point *data, char *extra)
 378 {
 379         struct wireless_dev *wdev = dev->ieee80211_ptr;
 380         struct iw_mlme *mlme = (struct iw_mlme *)extra;
 381         struct cfg80211_registered_device *rdev;
 382         int err;
 383
 384         if (!wdev)
 385                 return -EOPNOTSUPP;
 386
 387         rdev = wiphy_to_rdev(wdev->wiphy);
 388
 389         if (wdev->iftype != NL80211_IFTYPE_STATION)
 390                 return -EINVAL;
 391
 392         if (mlme->addr.sa_family != ARPHRD_ETHER)
 393                 return -EINVAL;
 394
 395         wiphy_lock(&rdev->wiphy);
 396         wdev_lock(wdev);
 397         switch (mlme->cmd) {
 398         case IW_MLME_DEAUTH:
 399         case IW_MLME_DISASSOC:
 400                 err = cfg80211_disconnect(rdev, dev, mlme->reason_code, true);
 401                 break;
 402         default:
 403                 err = -EOPNOTSUPP;
 404                 break;
 405         }
 406         wdev_unlock(wdev);
 407         wiphy_unlock(&rdev->wiphy);
 408
 409         return err;
 410 }