package/mac80211/src/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 #include "ieee80211_rate.h"
  18
  19 static enum ieee80211_if_types
  20 nl80211_type_to_mac80211_type(enum nl80211_iftype type)
  21 {
  22         switch (type) {
  23         case NL80211_IFTYPE_UNSPECIFIED:
  24                 return IEEE80211_IF_TYPE_STA;
  25         case NL80211_IFTYPE_ADHOC:
  26                 return IEEE80211_IF_TYPE_IBSS;
  27         case NL80211_IFTYPE_STATION:
  28                 return IEEE80211_IF_TYPE_STA;
  29         case NL80211_IFTYPE_MONITOR:
  30                 return IEEE80211_IF_TYPE_MNTR;
  31         default:
  32                 return IEEE80211_IF_TYPE_INVALID;
  33         }
  34 }
  35
  36 static int ieee80211_add_iface(struct wiphy *wiphy, char *name,
  37                                enum nl80211_iftype type, u32 *flags)
  38 {
  39         struct ieee80211_local *local = wiphy_priv(wiphy);
  40         enum ieee80211_if_types itype;
  41         struct net_device *dev;
  42         struct ieee80211_sub_if_data *sdata;
  43         int err;
  44
  45         if (unlikely(local->reg_state != IEEE80211_DEV_REGISTERED))
  46                 return -ENODEV;
  47
  48         itype = nl80211_type_to_mac80211_type(type);
  49         if (itype == IEEE80211_IF_TYPE_INVALID)
  50                 return -EINVAL;
  51
  52         err = ieee80211_if_add(local->mdev, name, &dev, itype);
  53         if (err || itype != IEEE80211_IF_TYPE_MNTR || !flags)
  54                 return err;
  55
  56         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
  57         sdata->u.mntr_flags = *flags;
  58         return 0;
  59 }
  60
  61 static int ieee80211_del_iface(struct wiphy *wiphy, int ifindex)
  62 {
  63         struct ieee80211_local *local = wiphy_priv(wiphy);
  64         struct net_device *dev;
  65         char *name;
  66
  67         if (unlikely(local->reg_state != IEEE80211_DEV_REGISTERED))
  68                 return -ENODEV;
  69
  70         /* we're under RTNL */
  71         dev = __dev_get_by_index(&init_net, ifindex);
  72         if (!dev)
  73                 return 0;
  74
  75         name = dev->name;
  76
  77         return ieee80211_if_remove(local->mdev, name, -1);
  78 }
  79
  80 static int ieee80211_change_iface(struct wiphy *wiphy, int ifindex,
  81                                   enum nl80211_iftype type, u32 *flags)
  82 {
  83         struct ieee80211_local *local = wiphy_priv(wiphy);
  84         struct net_device *dev;
  85         enum ieee80211_if_types itype;
  86         struct ieee80211_sub_if_data *sdata;
  87
  88         if (unlikely(local->reg_state != IEEE80211_DEV_REGISTERED))
  89                 return -ENODEV;
  90
  91         /* we're under RTNL */
  92         dev = __dev_get_by_index(&init_net, ifindex);
  93         if (!dev)
  94                 return -ENODEV;
  95
  96         if (netif_running(dev))
  97                 return -EBUSY;
  98
  99         itype = nl80211_type_to_mac80211_type(type);
 100         if (itype == IEEE80211_IF_TYPE_INVALID)
 101                 return -EINVAL;
 102
 103         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 104
 105         if (sdata->vif.type == IEEE80211_IF_TYPE_VLAN)
 106                 return -EOPNOTSUPP;
 107
 108         ieee80211_if_reinit(dev);
 109         ieee80211_if_set_type(dev, itype);
 110
 111         if (sdata->vif.type != IEEE80211_IF_TYPE_MNTR || !flags)
 112                 return 0;
 113
 114         sdata->u.mntr_flags = *flags;
 115         return 0;
 116 }
 117
 118 static int ieee80211_add_key(struct wiphy *wiphy, struct net_device *dev,
 119                              u8 key_idx, u8 *mac_addr,
 120                              struct key_params *params)
 121 {
 122         struct ieee80211_sub_if_data *sdata;
 123         struct sta_info *sta = NULL;
 124         enum ieee80211_key_alg alg;
 125         int ret;
 126
 127         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 128
 129         switch (params->cipher) {
 130         case WLAN_CIPHER_SUITE_WEP40:
 131         case WLAN_CIPHER_SUITE_WEP104:
 132                 alg = ALG_WEP;
 133                 break;
 134         case WLAN_CIPHER_SUITE_TKIP:
 135                 alg = ALG_TKIP;
 136                 break;
 137         case WLAN_CIPHER_SUITE_CCMP:
 138                 alg = ALG_CCMP;
 139                 break;
 140         default:
 141                 return -EINVAL;
 142         }
 143
 144         if (mac_addr) {
 145                 sta = sta_info_get(sdata->local, mac_addr);
 146                 if (!sta)
 147                         return -ENOENT;
 148         }
 149
 150         ret = 0;
 151         if (!ieee80211_key_alloc(sdata, sta, alg, key_idx,
 152                                  params->key_len, params->key))
 153                 ret = -ENOMEM;
 154
 155         if (sta)
 156                 sta_info_put(sta);
 157
 158         return ret;
 159 }
 160
 161 static int ieee80211_del_key(struct wiphy *wiphy, struct net_device *dev,
 162                              u8 key_idx, u8 *mac_addr)
 163 {
 164         struct ieee80211_sub_if_data *sdata;
 165         struct sta_info *sta;
 166         int ret;
 167
 168         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 169
 170         if (mac_addr) {
 171                 sta = sta_info_get(sdata->local, mac_addr);
 172                 if (!sta)
 173                         return -ENOENT;
 174
 175                 ret = 0;
 176                 if (sta->key)
 177                         ieee80211_key_free(sta->key);
 178                 else
 179                         ret = -ENOENT;
 180
 181                 sta_info_put(sta);
 182                 return ret;
 183         }
 184
 185         if (!sdata->keys[key_idx])
 186                 return -ENOENT;
 187
 188         ieee80211_key_free(sdata->keys[key_idx]);
 189
 190         return 0;
 191 }
 192
 193 static int ieee80211_get_key(struct wiphy *wiphy, struct net_device *dev,
 194                              u8 key_idx, u8 *mac_addr, void *cookie,
 195                              void (*callback)(void *cookie,
 196                                               struct key_params *params))
 197 {
 198         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 199         struct sta_info *sta = NULL;
 200         u8 seq[6] = {0};
 201         struct key_params params;
 202         struct ieee80211_key *key;
 203         u32 iv32;
 204         u16 iv16;
 205         int err = -ENOENT;
 206
 207         if (mac_addr) {
 208                 sta = sta_info_get(sdata->local, mac_addr);
 209                 if (!sta)
 210                         goto out;
 211
 212                 key = sta->key;
 213         } else
 214                 key = sdata->keys[key_idx];
 215
 216         if (!key)
 217                 goto out;
 218
 219         memset(&params, 0, sizeof(params));
 220
 221         switch (key->conf.alg) {
 222         case ALG_TKIP:
 223                 params.cipher = WLAN_CIPHER_SUITE_TKIP;
 224
 225                 iv32 = key->u.tkip.iv32;
 226                 iv16 = key->u.tkip.iv16;
 227
 228                 if (key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE &&
 229                     sdata->local->ops->get_tkip_seq)
 230                         sdata->local->ops->get_tkip_seq(
 231                                 local_to_hw(sdata->local),
 232                                 key->conf.hw_key_idx,
 233                                 &iv32, &iv16);
 234
 235                 seq[0] = iv16 & 0xff;
 236                 seq[1] = (iv16 >> 8) & 0xff;
 237                 seq[2] = iv32 & 0xff;
 238                 seq[3] = (iv32 >> 8) & 0xff;
 239                 seq[4] = (iv32 >> 16) & 0xff;
 240                 seq[5] = (iv32 >> 24) & 0xff;
 241                 params.seq = seq;
 242                 params.seq_len = 6;
 243                 break;
 244         case ALG_CCMP:
 245                 params.cipher = WLAN_CIPHER_SUITE_CCMP;
 246                 seq[0] = key->u.ccmp.tx_pn[5];
 247                 seq[1] = key->u.ccmp.tx_pn[4];
 248                 seq[2] = key->u.ccmp.tx_pn[3];
 249                 seq[3] = key->u.ccmp.tx_pn[2];
 250                 seq[4] = key->u.ccmp.tx_pn[1];
 251                 seq[5] = key->u.ccmp.tx_pn[0];
 252                 params.seq = seq;
 253                 params.seq_len = 6;
 254                 break;
 255         case ALG_WEP:
 256                 if (key->conf.keylen == 5)
 257                         params.cipher = WLAN_CIPHER_SUITE_WEP40;
 258                 else
 259                         params.cipher = WLAN_CIPHER_SUITE_WEP104;
 260                 break;
 261         }
 262
 263         params.key = key->conf.key;
 264         params.key_len = key->conf.keylen;
 265
 266         callback(cookie, &params);
 267         err = 0;
 268
 269  out:
 270         if (sta)
 271                 sta_info_put(sta);
 272         return err;
 273 }
 274
 275 static int ieee80211_config_default_key(struct wiphy *wiphy,
 276                                         struct net_device *dev,
 277                                         u8 key_idx)
 278 {
 279         struct ieee80211_sub_if_data *sdata;
 280
 281         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 282         ieee80211_set_default_key(sdata, key_idx);
 283
 284         return 0;
 285 }
 286
 287 static int ieee80211_get_station(struct wiphy *wiphy, struct net_device *dev,
 288                                  u8 *mac, struct station_stats *stats)
 289 {
 290         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 291         struct sta_info *sta;
 292
 293         sta = sta_info_get(local, mac);
 294         if (!sta)
 295                 return -ENOENT;
 296
 297         /* XXX: verify sta->dev == dev */
 298
 299         stats->filled = STATION_STAT_INACTIVE_TIME |
 300                         STATION_STAT_RX_BYTES |
 301                         STATION_STAT_TX_BYTES;
 302
 303         stats->inactive_time = jiffies_to_msecs(jiffies - sta->last_rx);
 304         stats->rx_bytes = sta->rx_bytes;
 305         stats->tx_bytes = sta->tx_bytes;
 306
 307         sta_info_put(sta);
 308
 309         return 0;
 310 }
 311
 312 /*
 313  * This handles both adding a beacon and setting new beacon info
 314  */
 315 static int ieee80211_config_beacon(struct ieee80211_sub_if_data *sdata,
 316                                    struct beacon_parameters *params)
 317 {
 318         struct beacon_data *new, *old;
 319         int new_head_len, new_tail_len;
 320         int size;
 321         int err = -EINVAL;
 322
 323         old = sdata->u.ap.beacon;
 324
 325         /* head must not be zero-length */
 326         if (params->head && !params->head_len)
 327                 return -EINVAL;
 328
 329         /*
 330          * This is a kludge. beacon interval should really be part
 331          * of the beacon information.
 332          */
 333         if (params->interval) {
 334                 sdata->local->hw.conf.beacon_int = params->interval;
 335                 if (ieee80211_hw_config(sdata->local))
 336                         return -EINVAL;
 337                 /*
 338                  * We updated some parameter so if below bails out
 339                  * it's not an error.
 340                  */
 341                 err = 0;
 342         }
 343
 344         /* Need to have a beacon head if we don't have one yet */
 345         if (!params->head && !old)
 346                 return err;
 347
 348         /* sorry, no way to start beaconing without dtim period */
 349         if (!params->dtim_period && !old)
 350                 return err;
 351
 352         /* new or old head? */
 353         if (params->head)
 354                 new_head_len = params->head_len;
 355         else
 356                 new_head_len = old->head_len;
 357
 358         /* new or old tail? */
 359         if (params->tail || !old)
 360                 /* params->tail_len will be zero for !params->tail */
 361                 new_tail_len = params->tail_len;
 362         else
 363                 new_tail_len = old->tail_len;
 364
 365         size = sizeof(*new) + new_head_len + new_tail_len;
 366
 367         new = kzalloc(size, GFP_KERNEL);
 368         if (!new)
 369                 return -ENOMEM;
 370
 371         /* start filling the new info now */
 372
 373         /* new or old dtim period? */
 374         if (params->dtim_period)
 375                 new->dtim_period = params->dtim_period;
 376         else
 377                 new->dtim_period = old->dtim_period;
 378
 379         /*
 380          * pointers go into the block we allocated,
 381          * memory is | beacon_data | head | tail |
 382          */
 383         new->head = ((u8 *) new) + sizeof(*new);
 384         new->tail = new->head + new_head_len;
 385         new->head_len = new_head_len;
 386         new->tail_len = new_tail_len;
 387
 388         /* copy in head */
 389         if (params->head)
 390                 memcpy(new->head, params->head, new_head_len);
 391         else
 392                 memcpy(new->head, old->head, new_head_len);
 393
 394         /* copy in optional tail */
 395         if (params->tail)
 396                 memcpy(new->tail, params->tail, new_tail_len);
 397         else
 398                 if (old)
 399                         memcpy(new->tail, old->tail, new_tail_len);
 400
 401         rcu_assign_pointer(sdata->u.ap.beacon, new);
 402
 403         synchronize_rcu();
 404
 405         kfree(old);
 406
 407         return ieee80211_if_config_beacon(sdata->dev);
 408 }
 409
 410 static int ieee80211_add_beacon(struct wiphy *wiphy, struct net_device *dev,
 411                                 struct beacon_parameters *params)
 412 {
 413         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 414         struct beacon_data *old;
 415
 416         if (sdata->vif.type != IEEE80211_IF_TYPE_AP)
 417                 return -EINVAL;
 418
 419         old = sdata->u.ap.beacon;
 420
 421         if (old)
 422                 return -EALREADY;
 423
 424         return ieee80211_config_beacon(sdata, params);
 425 }
 426
 427 static int ieee80211_set_beacon(struct wiphy *wiphy, struct net_device *dev,
 428                                 struct beacon_parameters *params)
 429 {
 430         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 431         struct beacon_data *old;
 432
 433         if (sdata->vif.type != IEEE80211_IF_TYPE_AP)
 434                 return -EINVAL;
 435
 436         old = sdata->u.ap.beacon;
 437
 438         if (!old)
 439                 return -ENOENT;
 440
 441         return ieee80211_config_beacon(sdata, params);
 442 }
 443
 444 static int ieee80211_del_beacon(struct wiphy *wiphy, struct net_device *dev)
 445 {
 446         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 447         struct beacon_data *old;
 448
 449         if (sdata->vif.type != IEEE80211_IF_TYPE_AP)
 450                 return -EINVAL;
 451
 452         old = sdata->u.ap.beacon;
 453
 454         if (!old)
 455                 return -ENOENT;
 456
 457         rcu_assign_pointer(sdata->u.ap.beacon, NULL);
 458         synchronize_rcu();
 459         kfree(old);
 460
 461         return ieee80211_if_config_beacon(dev);
 462 }
 463
 464 /* Layer 2 Update frame (802.2 Type 1 LLC XID Update response) */
 465 struct iapp_layer2_update {
 466         u8 da[ETH_ALEN];        /* broadcast */
 467         u8 sa[ETH_ALEN];        /* STA addr */
 468         __be16 len;             /* 6 */
 469         u8 dsap;                /* 0 */
 470         u8 ssap;                /* 0 */
 471         u8 control;
 472         u8 xid_info[3];
 473 } __attribute__ ((packed));
 474
 475 static void ieee80211_send_layer2_update(struct sta_info *sta)
 476 {
 477         struct iapp_layer2_update *msg;
 478         struct sk_buff *skb;
 479
 480         /* Send Level 2 Update Frame to update forwarding tables in layer 2
 481          * bridge devices */
 482
 483         skb = dev_alloc_skb(sizeof(*msg));
 484         if (!skb)
 485                 return;
 486         msg = (struct iapp_layer2_update *)skb_put(skb, sizeof(*msg));
 487
 488         /* 802.2 Type 1 Logical Link Control (LLC) Exchange Identifier (XID)
 489          * Update response frame; IEEE Std 802.2-1998, 5.4.1.2.1 */
 490
 491         memset(msg->da, 0xff, ETH_ALEN);
 492         memcpy(msg->sa, sta->addr, ETH_ALEN);
 493         msg->len = htons(6);
 494         msg->dsap = 0;
 495         msg->ssap = 0x01;       /* NULL LSAP, CR Bit: Response */
 496         msg->control = 0xaf;    /* XID response lsb.1111F101.
 497                                  * F=0 (no poll command; unsolicited frame) */
 498         msg->xid_info[0] = 0x81;        /* XID format identifier */
 499         msg->xid_info[1] = 1;   /* LLC types/classes: Type 1 LLC */
 500         msg->xid_info[2] = 0;   /* XID sender's receive window size (RW) */
 501
 502         skb->dev = sta->dev;
 503         skb->protocol = eth_type_trans(skb, sta->dev);
 504         memset(skb->cb, 0, sizeof(skb->cb));
 505         netif_rx(skb);
 506 }
 507
 508 static void sta_apply_parameters(struct ieee80211_local *local,
 509                                  struct sta_info *sta,
 510                                  struct station_parameters *params)
 511 {
 512         u32 rates;
 513         int i, j;
 514         struct ieee80211_supported_band *sband;
 515
 516         if (params->station_flags & STATION_FLAG_CHANGED) {
 517                 sta->flags &= ~WLAN_STA_AUTHORIZED;
 518                 if (params->station_flags & STATION_FLAG_AUTHORIZED)
 519                         sta->flags |= WLAN_STA_AUTHORIZED;
 520
 521                 sta->flags &= ~WLAN_STA_SHORT_PREAMBLE;
 522                 if (params->station_flags & STATION_FLAG_SHORT_PREAMBLE)
 523                         sta->flags |= WLAN_STA_SHORT_PREAMBLE;
 524
 525                 sta->flags &= ~WLAN_STA_WME;
 526                 if (params->station_flags & STATION_FLAG_WME)
 527                         sta->flags |= WLAN_STA_WME;
 528         }
 529
 530         if (params->aid) {
 531                 sta->aid = params->aid;
 532                 if (sta->aid > IEEE80211_MAX_AID)
 533                         sta->aid = 0; /* XXX: should this be an error? */
 534         }
 535
 536         if (params->listen_interval >= 0)
 537                 sta->listen_interval = params->listen_interval;
 538
 539         if (params->supported_rates) {
 540                 rates = 0;
 541                 sband = local->hw.wiphy->bands[local->oper_channel->band];
 542
 543                 for (i = 0; i < params->supported_rates_len; i++) {
 544                         int rate = (params->supported_rates[i] & 0x7f) * 5;
 545                         for (j = 0; j < sband->n_bitrates; j++) {
 546                                 if (sband->bitrates[j].bitrate == rate)
 547                                         rates |= BIT(j);
 548                         }
 549                 }
 550                 sta->supp_rates[local->oper_channel->band] = rates;
 551         }
 552 }
 553
 554 static int ieee80211_add_station(struct wiphy *wiphy, struct net_device *dev,
 555                                  u8 *mac, struct station_parameters *params)
 556 {
 557         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 558         struct sta_info *sta;
 559         struct ieee80211_sub_if_data *sdata;
 560
 561         /* Prevent a race with changing the rate control algorithm */
 562         if (!netif_running(dev))
 563                 return -ENETDOWN;
 564
 565         /* XXX: get sta belonging to dev */
 566         sta = sta_info_get(local, mac);
 567         if (sta) {
 568                 sta_info_put(sta);
 569                 return -EEXIST;
 570         }
 571
 572         if (params->vlan) {
 573                 sdata = IEEE80211_DEV_TO_SUB_IF(params->vlan);
 574
 575                 if (sdata->vif.type != IEEE80211_IF_TYPE_VLAN ||
 576                     sdata->vif.type != IEEE80211_IF_TYPE_AP)
 577                         return -EINVAL;
 578         } else
 579                 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 580
 581         sta = sta_info_add(local, dev, mac, GFP_KERNEL);
 582         if (!sta)
 583                 return -ENOMEM;
 584
 585         sta->dev = sdata->dev;
 586         if (sdata->vif.type == IEEE80211_IF_TYPE_VLAN ||
 587             sdata->vif.type == IEEE80211_IF_TYPE_AP)
 588                 ieee80211_send_layer2_update(sta);
 589
 590         sta->flags = WLAN_STA_AUTH | WLAN_STA_ASSOC;
 591
 592         sta_apply_parameters(local, sta, params);
 593
 594         rate_control_rate_init(sta, local);
 595
 596         sta_info_put(sta);
 597
 598         return 0;
 599 }
 600
 601 static int ieee80211_del_station(struct wiphy *wiphy, struct net_device *dev,
 602                                  u8 *mac)
 603 {
 604         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 605         struct sta_info *sta;
 606
 607         if (mac) {
 608                 /* XXX: get sta belonging to dev */
 609                 sta = sta_info_get(local, mac);
 610                 if (!sta)
 611                         return -ENOENT;
 612
 613                 sta_info_free(sta);
 614                 sta_info_put(sta);
 615         } else
 616                 sta_info_flush(local, dev);
 617
 618         return 0;
 619 }
 620
 621 static int ieee80211_change_station(struct wiphy *wiphy,
 622                                     struct net_device *dev,
 623                                     u8 *mac,
 624                                     struct station_parameters *params)
 625 {
 626         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 627         struct sta_info *sta;
 628         struct ieee80211_sub_if_data *vlansdata;
 629
 630         /* XXX: get sta belonging to dev */
 631         sta = sta_info_get(local, mac);
 632         if (!sta)
 633                 return -ENOENT;
 634
 635         if (params->vlan && params->vlan != sta->dev) {
 636                 vlansdata = IEEE80211_DEV_TO_SUB_IF(params->vlan);
 637
 638                 if (vlansdata->vif.type != IEEE80211_IF_TYPE_VLAN ||
 639                     vlansdata->vif.type != IEEE80211_IF_TYPE_AP)
 640                         return -EINVAL;
 641
 642                 sta->dev = params->vlan;
 643                 ieee80211_send_layer2_update(sta);
 644         }
 645
 646         sta_apply_parameters(local, sta, params);
 647
 648         sta_info_put(sta);
 649
 650         return 0;
 651 }
 652
 653 struct cfg80211_ops mac80211_config_ops = {
 654         .add_virtual_intf = ieee80211_add_iface,
 655         .del_virtual_intf = ieee80211_del_iface,
 656         .change_virtual_intf = ieee80211_change_iface,
 657         .add_key = ieee80211_add_key,
 658         .del_key = ieee80211_del_key,
 659         .get_key = ieee80211_get_key,
 660         .set_default_key = ieee80211_config_default_key,
 661         .add_beacon = ieee80211_add_beacon,
 662         .set_beacon = ieee80211_set_beacon,
 663         .del_beacon = ieee80211_del_beacon,
 664         .add_station = ieee80211_add_station,
 665         .del_station = ieee80211_del_station,
 666         .change_station = ieee80211_change_station,
 667         .get_station = ieee80211_get_station,
 668 };