err.no Git - linux-2.6/blob - net/mac80211/cfg.c

   1 /*
   2  * mac80211 configuration hooks for cfg80211
   3  *
   4  * Copyright 2006, 2007 Johannes Berg <johannes@sipsolutions.net>
   5  *
   6  * This file is GPLv2 as found in COPYING.
   7  */
   8
   9 #include <linux/ieee80211.h>
  10 #include <linux/nl80211.h>
  11 #include <linux/rtnetlink.h>
  12 #include <net/net_namespace.h>
  13 #include <linux/rcupdate.h>
  14 #include <net/cfg80211.h>
  15 #include "ieee80211_i.h"
  16 #include "cfg.h"
  17
  18 static enum ieee80211_if_types
  19 nl80211_type_to_mac80211_type(enum nl80211_iftype type)
  20 {
  21         switch (type) {
  22         case NL80211_IFTYPE_UNSPECIFIED:
  23                 return IEEE80211_IF_TYPE_STA;
  24         case NL80211_IFTYPE_ADHOC:
  25                 return IEEE80211_IF_TYPE_IBSS;
  26         case NL80211_IFTYPE_STATION:
  27                 return IEEE80211_IF_TYPE_STA;
  28         case NL80211_IFTYPE_MONITOR:
  29                 return IEEE80211_IF_TYPE_MNTR;
  30         default:
  31                 return IEEE80211_IF_TYPE_INVALID;
  32         }
  33 }
  34
  35 static int ieee80211_add_iface(struct wiphy *wiphy, char *name,
  36                                enum nl80211_iftype type)
  37 {
  38         struct ieee80211_local *local = wiphy_priv(wiphy);
  39         enum ieee80211_if_types itype;
  40
  41         if (unlikely(local->reg_state != IEEE80211_DEV_REGISTERED))
  42                 return -ENODEV;
  43
  44         itype = nl80211_type_to_mac80211_type(type);
  45         if (itype == IEEE80211_IF_TYPE_INVALID)
  46                 return -EINVAL;
  47
  48         return ieee80211_if_add(local->mdev, name, NULL, itype);
  49 }
  50
  51 static int ieee80211_del_iface(struct wiphy *wiphy, int ifindex)
  52 {
  53         struct ieee80211_local *local = wiphy_priv(wiphy);
  54         struct net_device *dev;
  55         char *name;
  56
  57         if (unlikely(local->reg_state != IEEE80211_DEV_REGISTERED))
  58                 return -ENODEV;
  59
  60         /* we're under RTNL */
  61         dev = __dev_get_by_index(&init_net, ifindex);
  62         if (!dev)
  63                 return 0;
  64
  65         name = dev->name;
  66
  67         return ieee80211_if_remove(local->mdev, name, -1);
  68 }
  69
  70 static int ieee80211_change_iface(struct wiphy *wiphy, int ifindex,
  71                                   enum nl80211_iftype type)
  72 {
  73         struct ieee80211_local *local = wiphy_priv(wiphy);
  74         struct net_device *dev;
  75         enum ieee80211_if_types itype;
  76         struct ieee80211_sub_if_data *sdata;
  77
  78         if (unlikely(local->reg_state != IEEE80211_DEV_REGISTERED))
  79                 return -ENODEV;
  80
  81         /* we're under RTNL */
  82         dev = __dev_get_by_index(&init_net, ifindex);
  83         if (!dev)
  84                 return -ENODEV;
  85
  86         if (netif_running(dev))
  87                 return -EBUSY;
  88
  89         itype = nl80211_type_to_mac80211_type(type);
  90         if (itype == IEEE80211_IF_TYPE_INVALID)
  91                 return -EINVAL;
  92
  93         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
  94
  95         if (sdata->vif.type == IEEE80211_IF_TYPE_VLAN)
  96                 return -EOPNOTSUPP;
  97
  98         ieee80211_if_reinit(dev);
  99         ieee80211_if_set_type(dev, itype);
 100
 101         return 0;
 102 }
 103
 104 static int ieee80211_add_key(struct wiphy *wiphy, struct net_device *dev,
 105                              u8 key_idx, u8 *mac_addr,
 106                              struct key_params *params)
 107 {
 108         struct ieee80211_sub_if_data *sdata;
 109         struct sta_info *sta = NULL;
 110         enum ieee80211_key_alg alg;
 111         int ret;
 112
 113         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 114
 115         switch (params->cipher) {
 116         case WLAN_CIPHER_SUITE_WEP40:
 117         case WLAN_CIPHER_SUITE_WEP104:
 118                 alg = ALG_WEP;
 119                 break;
 120         case WLAN_CIPHER_SUITE_TKIP:
 121                 alg = ALG_TKIP;
 122                 break;
 123         case WLAN_CIPHER_SUITE_CCMP:
 124                 alg = ALG_CCMP;
 125                 break;
 126         default:
 127                 return -EINVAL;
 128         }
 129
 130         if (mac_addr) {
 131                 sta = sta_info_get(sdata->local, mac_addr);
 132                 if (!sta)
 133                         return -ENOENT;
 134         }
 135
 136         ret = 0;
 137         if (!ieee80211_key_alloc(sdata, sta, alg, key_idx,
 138                                  params->key_len, params->key))
 139                 ret = -ENOMEM;
 140
 141         if (sta)
 142                 sta_info_put(sta);
 143
 144         return ret;
 145 }
 146
 147 static int ieee80211_del_key(struct wiphy *wiphy, struct net_device *dev,
 148                              u8 key_idx, u8 *mac_addr)
 149 {
 150         struct ieee80211_sub_if_data *sdata;
 151         struct sta_info *sta;
 152         int ret;
 153
 154         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 155
 156         if (mac_addr) {
 157                 sta = sta_info_get(sdata->local, mac_addr);
 158                 if (!sta)
 159                         return -ENOENT;
 160
 161                 ret = 0;
 162                 if (sta->key)
 163                         ieee80211_key_free(sta->key);
 164                 else
 165                         ret = -ENOENT;
 166
 167                 sta_info_put(sta);
 168                 return ret;
 169         }
 170
 171         if (!sdata->keys[key_idx])
 172                 return -ENOENT;
 173
 174         ieee80211_key_free(sdata->keys[key_idx]);
 175
 176         return 0;
 177 }
 178
 179 static int ieee80211_get_key(struct wiphy *wiphy, struct net_device *dev,
 180                              u8 key_idx, u8 *mac_addr, void *cookie,
 181                              void (*callback)(void *cookie,
 182                                               struct key_params *params))
 183 {
 184         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 185         struct sta_info *sta = NULL;
 186         u8 seq[6] = {0};
 187         struct key_params params;
 188         struct ieee80211_key *key;
 189         u32 iv32;
 190         u16 iv16;
 191         int err = -ENOENT;
 192
 193         if (mac_addr) {
 194                 sta = sta_info_get(sdata->local, mac_addr);
 195                 if (!sta)
 196                         goto out;
 197
 198                 key = sta->key;
 199         } else
 200                 key = sdata->keys[key_idx];
 201
 202         if (!key)
 203                 goto out;
 204
 205         memset(&params, 0, sizeof(params));
 206
 207         switch (key->conf.alg) {
 208         case ALG_TKIP:
 209                 params.cipher = WLAN_CIPHER_SUITE_TKIP;
 210
 211                 iv32 = key->u.tkip.iv32;
 212                 iv16 = key->u.tkip.iv16;
 213
 214                 if (key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE &&
 215                     sdata->local->ops->get_tkip_seq)
 216                         sdata->local->ops->get_tkip_seq(
 217                                 local_to_hw(sdata->local),
 218                                 key->conf.hw_key_idx,
 219                                 &iv32, &iv16);
 220
 221                 seq[0] = iv16 & 0xff;
 222                 seq[1] = (iv16 >> 8) & 0xff;
 223                 seq[2] = iv32 & 0xff;
 224                 seq[3] = (iv32 >> 8) & 0xff;
 225                 seq[4] = (iv32 >> 16) & 0xff;
 226                 seq[5] = (iv32 >> 24) & 0xff;
 227                 params.seq = seq;
 228                 params.seq_len = 6;
 229                 break;
 230         case ALG_CCMP:
 231                 params.cipher = WLAN_CIPHER_SUITE_CCMP;
 232                 seq[0] = key->u.ccmp.tx_pn[5];
 233                 seq[1] = key->u.ccmp.tx_pn[4];
 234                 seq[2] = key->u.ccmp.tx_pn[3];
 235                 seq[3] = key->u.ccmp.tx_pn[2];
 236                 seq[4] = key->u.ccmp.tx_pn[1];
 237                 seq[5] = key->u.ccmp.tx_pn[0];
 238                 params.seq = seq;
 239                 params.seq_len = 6;
 240                 break;
 241         case ALG_WEP:
 242                 if (key->conf.keylen == 5)
 243                         params.cipher = WLAN_CIPHER_SUITE_WEP40;
 244                 else
 245                         params.cipher = WLAN_CIPHER_SUITE_WEP104;
 246                 break;
 247         }
 248
 249         params.key = key->conf.key;
 250         params.key_len = key->conf.keylen;
 251
 252         callback(cookie, &params);
 253         err = 0;
 254
 255  out:
 256         if (sta)
 257                 sta_info_put(sta);
 258         return err;
 259 }
 260
 261 static int ieee80211_config_default_key(struct wiphy *wiphy,
 262                                         struct net_device *dev,
 263                                         u8 key_idx)
 264 {
 265         struct ieee80211_sub_if_data *sdata;
 266
 267         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 268         ieee80211_set_default_key(sdata, key_idx);
 269
 270         return 0;
 271 }
 272
 273 static int ieee80211_get_station(struct wiphy *wiphy, struct net_device *dev,
 274                                  u8 *mac, struct station_stats *stats)
 275 {
 276         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 277         struct sta_info *sta;
 278
 279         sta = sta_info_get(local, mac);
 280         if (!sta)
 281                 return -ENOENT;
 282
 283         /* XXX: verify sta->dev == dev */
 284
 285         stats->filled = STATION_STAT_INACTIVE_TIME |
 286                         STATION_STAT_RX_BYTES |
 287                         STATION_STAT_TX_BYTES;
 288
 289         stats->inactive_time = jiffies_to_msecs(jiffies - sta->last_rx);
 290         stats->rx_bytes = sta->rx_bytes;
 291         stats->tx_bytes = sta->tx_bytes;
 292
 293         sta_info_put(sta);
 294
 295         return 0;
 296 }
 297
 298 /*
 299  * This handles both adding a beacon and setting new beacon info
 300  */
 301 static int ieee80211_config_beacon(struct ieee80211_sub_if_data *sdata,
 302                                    struct beacon_parameters *params)
 303 {
 304         struct beacon_data *new, *old;
 305         int new_head_len, new_tail_len;
 306         int size;
 307         int err = -EINVAL;
 308
 309         old = sdata->u.ap.beacon;
 310
 311         /* head must not be zero-length */
 312         if (params->head && !params->head_len)
 313                 return -EINVAL;
 314
 315         /*
 316          * This is a kludge. beacon interval should really be part
 317          * of the beacon information.
 318          */
 319         if (params->interval) {
 320                 sdata->local->hw.conf.beacon_int = params->interval;
 321                 if (ieee80211_hw_config(sdata->local))
 322                         return -EINVAL;
 323                 /*
 324                  * We updated some parameter so if below bails out
 325                  * it's not an error.
 326                  */
 327                 err = 0;
 328         }
 329
 330         /* Need to have a beacon head if we don't have one yet */
 331         if (!params->head && !old)
 332                 return err;
 333
 334         /* sorry, no way to start beaconing without dtim period */
 335         if (!params->dtim_period && !old)
 336                 return err;
 337
 338         /* new or old head? */
 339         if (params->head)
 340                 new_head_len = params->head_len;
 341         else
 342                 new_head_len = old->head_len;
 343
 344         /* new or old tail? */
 345         if (params->tail || !old)
 346                 /* params->tail_len will be zero for !params->tail */
 347                 new_tail_len = params->tail_len;
 348         else
 349                 new_tail_len = old->tail_len;
 350
 351         size = sizeof(*new) + new_head_len + new_tail_len;
 352
 353         new = kzalloc(size, GFP_KERNEL);
 354         if (!new)
 355                 return -ENOMEM;
 356
 357         /* start filling the new info now */
 358
 359         /* new or old dtim period? */
 360         if (params->dtim_period)
 361                 new->dtim_period = params->dtim_period;
 362         else
 363                 new->dtim_period = old->dtim_period;
 364
 365         /*
 366          * pointers go into the block we allocated,
 367          * memory is | beacon_data | head | tail |
 368          */
 369         new->head = ((u8 *) new) + sizeof(*new);
 370         new->tail = new->head + new_head_len;
 371         new->head_len = new_head_len;
 372         new->tail_len = new_tail_len;
 373
 374         /* copy in head */
 375         if (params->head)
 376                 memcpy(new->head, params->head, new_head_len);
 377         else
 378                 memcpy(new->head, old->head, new_head_len);
 379
 380         /* copy in optional tail */
 381         if (params->tail)
 382                 memcpy(new->tail, params->tail, new_tail_len);
 383         else
 384                 if (old)
 385                         memcpy(new->tail, old->tail, new_tail_len);
 386
 387         rcu_assign_pointer(sdata->u.ap.beacon, new);
 388
 389         synchronize_rcu();
 390
 391         kfree(old);
 392
 393         return ieee80211_if_config_beacon(sdata->dev);
 394 }
 395
 396 static int ieee80211_add_beacon(struct wiphy *wiphy, struct net_device *dev,
 397                                 struct beacon_parameters *params)
 398 {
 399         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 400         struct beacon_data *old;
 401
 402         if (sdata->vif.type != IEEE80211_IF_TYPE_AP)
 403                 return -EINVAL;
 404
 405         old = sdata->u.ap.beacon;
 406
 407         if (old)
 408                 return -EALREADY;
 409
 410         return ieee80211_config_beacon(sdata, params);
 411 }
 412
 413 static int ieee80211_set_beacon(struct wiphy *wiphy, struct net_device *dev,
 414                                 struct beacon_parameters *params)
 415 {
 416         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 417         struct beacon_data *old;
 418
 419         if (sdata->vif.type != IEEE80211_IF_TYPE_AP)
 420                 return -EINVAL;
 421
 422         old = sdata->u.ap.beacon;
 423
 424         if (!old)
 425                 return -ENOENT;
 426
 427         return ieee80211_config_beacon(sdata, params);
 428 }
 429
 430 static int ieee80211_del_beacon(struct wiphy *wiphy, struct net_device *dev)
 431 {
 432         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 433         struct beacon_data *old;
 434
 435         if (sdata->vif.type != IEEE80211_IF_TYPE_AP)
 436                 return -EINVAL;
 437
 438         old = sdata->u.ap.beacon;
 439
 440         if (!old)
 441                 return -ENOENT;
 442
 443         rcu_assign_pointer(sdata->u.ap.beacon, NULL);
 444         synchronize_rcu();
 445         kfree(old);
 446
 447         return ieee80211_if_config_beacon(dev);
 448 }
 449
 450 struct cfg80211_ops mac80211_config_ops = {
 451         .add_virtual_intf = ieee80211_add_iface,
 452         .del_virtual_intf = ieee80211_del_iface,
 453         .change_virtual_intf = ieee80211_change_iface,
 454         .add_key = ieee80211_add_key,
 455         .del_key = ieee80211_del_key,
 456         .get_key = ieee80211_get_key,
 457         .set_default_key = ieee80211_config_default_key,
 458         .add_beacon = ieee80211_add_beacon,
 459         .set_beacon = ieee80211_set_beacon,
 460         .del_beacon = ieee80211_del_beacon,
 461         .get_station = ieee80211_get_station,
 462 };