linux/net/wireless/wext-sme.c
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   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, 2020-2021 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
  18int 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
  65int 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
 116int 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
 144int 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
 200int 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        int ret = 0;
 206
 207        /* call only for station! */
 208        if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
 209                return -EINVAL;
 210
 211        data->flags = 0;
 212
 213        wdev_lock(wdev);
 214        if (wdev->current_bss) {
 215                const struct element *ssid_elem;
 216
 217                rcu_read_lock();
 218                ssid_elem = ieee80211_bss_get_elem(&wdev->current_bss->pub,
 219                                                   WLAN_EID_SSID);
 220                if (ssid_elem) {
 221                        data->flags = 1;
 222                        data->length = ssid_elem->datalen;
 223                        if (data->length > IW_ESSID_MAX_SIZE)
 224                                ret = -EINVAL;
 225                        else
 226                                memcpy(ssid, ssid_elem->data, data->length);
 227                }
 228                rcu_read_unlock();
 229        } else if (wdev->wext.connect.ssid && wdev->wext.connect.ssid_len) {
 230                data->flags = 1;
 231                data->length = wdev->wext.connect.ssid_len;
 232                memcpy(ssid, wdev->wext.connect.ssid, data->length);
 233        }
 234        wdev_unlock(wdev);
 235
 236        return ret;
 237}
 238
 239int cfg80211_mgd_wext_siwap(struct net_device *dev,
 240                            struct iw_request_info *info,
 241                            struct sockaddr *ap_addr, char *extra)
 242{
 243        struct wireless_dev *wdev = dev->ieee80211_ptr;
 244        struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 245        u8 *bssid = ap_addr->sa_data;
 246        int err;
 247
 248        /* call only for station! */
 249        if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
 250                return -EINVAL;
 251
 252        if (ap_addr->sa_family != ARPHRD_ETHER)
 253                return -EINVAL;
 254
 255        /* automatic mode */
 256        if (is_zero_ether_addr(bssid) || is_broadcast_ether_addr(bssid))
 257                bssid = NULL;
 258
 259        wdev_lock(wdev);
 260
 261        if (wdev->conn) {
 262                err = 0;
 263                /* both automatic */
 264                if (!bssid && !wdev->wext.connect.bssid)
 265                        goto out;
 266
 267                /* fixed already - and no change */
 268                if (wdev->wext.connect.bssid && bssid &&
 269                    ether_addr_equal(bssid, wdev->wext.connect.bssid))
 270                        goto out;
 271
 272                err = cfg80211_disconnect(rdev, dev,
 273                                          WLAN_REASON_DEAUTH_LEAVING, false);
 274                if (err)
 275                        goto out;
 276        }
 277
 278        if (bssid) {
 279                memcpy(wdev->wext.bssid, bssid, ETH_ALEN);
 280                wdev->wext.connect.bssid = wdev->wext.bssid;
 281        } else
 282                wdev->wext.connect.bssid = NULL;
 283
 284        err = cfg80211_mgd_wext_connect(rdev, wdev);
 285 out:
 286        wdev_unlock(wdev);
 287        return err;
 288}
 289
 290int cfg80211_mgd_wext_giwap(struct net_device *dev,
 291                            struct iw_request_info *info,
 292                            struct sockaddr *ap_addr, char *extra)
 293{
 294        struct wireless_dev *wdev = dev->ieee80211_ptr;
 295
 296        /* call only for station! */
 297        if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
 298                return -EINVAL;
 299
 300        ap_addr->sa_family = ARPHRD_ETHER;
 301
 302        wdev_lock(wdev);
 303        if (wdev->current_bss)
 304                memcpy(ap_addr->sa_data, wdev->current_bss->pub.bssid, ETH_ALEN);
 305        else
 306                eth_zero_addr(ap_addr->sa_data);
 307        wdev_unlock(wdev);
 308
 309        return 0;
 310}
 311
 312int cfg80211_wext_siwgenie(struct net_device *dev,
 313                           struct iw_request_info *info,
 314                           struct iw_point *data, char *extra)
 315{
 316        struct wireless_dev *wdev = dev->ieee80211_ptr;
 317        struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 318        u8 *ie = extra;
 319        int ie_len = data->length, err;
 320
 321        if (wdev->iftype != NL80211_IFTYPE_STATION)
 322                return -EOPNOTSUPP;
 323
 324        if (!ie_len)
 325                ie = NULL;
 326
 327        wdev_lock(wdev);
 328
 329        /* no change */
 330        err = 0;
 331        if (wdev->wext.ie_len == ie_len &&
 332            memcmp(wdev->wext.ie, ie, ie_len) == 0)
 333                goto out;
 334
 335        if (ie_len) {
 336                ie = kmemdup(extra, ie_len, GFP_KERNEL);
 337                if (!ie) {
 338                        err = -ENOMEM;
 339                        goto out;
 340                }
 341        } else
 342                ie = NULL;
 343
 344        kfree(wdev->wext.ie);
 345        wdev->wext.ie = ie;
 346        wdev->wext.ie_len = ie_len;
 347
 348        if (wdev->conn) {
 349                err = cfg80211_disconnect(rdev, dev,
 350                                          WLAN_REASON_DEAUTH_LEAVING, false);
 351                if (err)
 352                        goto out;
 353        }
 354
 355        /* userspace better not think we'll reconnect */
 356        err = 0;
 357 out:
 358        wdev_unlock(wdev);
 359        return err;
 360}
 361
 362int cfg80211_wext_siwmlme(struct net_device *dev,
 363                          struct iw_request_info *info,
 364                          struct iw_point *data, char *extra)
 365{
 366        struct wireless_dev *wdev = dev->ieee80211_ptr;
 367        struct iw_mlme *mlme = (struct iw_mlme *)extra;
 368        struct cfg80211_registered_device *rdev;
 369        int err;
 370
 371        if (!wdev)
 372                return -EOPNOTSUPP;
 373
 374        rdev = wiphy_to_rdev(wdev->wiphy);
 375
 376        if (wdev->iftype != NL80211_IFTYPE_STATION)
 377                return -EINVAL;
 378
 379        if (mlme->addr.sa_family != ARPHRD_ETHER)
 380                return -EINVAL;
 381
 382        wiphy_lock(&rdev->wiphy);
 383        wdev_lock(wdev);
 384        switch (mlme->cmd) {
 385        case IW_MLME_DEAUTH:
 386        case IW_MLME_DISASSOC:
 387                err = cfg80211_disconnect(rdev, dev, mlme->reason_code, true);
 388                break;
 389        default:
 390                err = -EOPNOTSUPP;
 391                break;
 392        }
 393        wdev_unlock(wdev);
 394        wiphy_unlock(&rdev->wiphy);
 395
 396        return err;
 397}
 398