net/mac80211/ieee80211.c

   1 /*
   2  * Copyright 2002-2005, Instant802 Networks, Inc.
   3  * Copyright 2005-2006, Devicescape Software, Inc.
   4  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10
  11 #include <net/mac80211.h>
  12 #include <net/ieee80211_radiotap.h>
  13 #include <linux/module.h>
  14 #include <linux/init.h>
  15 #include <linux/netdevice.h>
  16 #include <linux/types.h>
  17 #include <linux/slab.h>
  18 #include <linux/skbuff.h>
  19 #include <linux/etherdevice.h>
  20 #include <linux/if_arp.h>
  21 #include <linux/wireless.h>
  22 #include <linux/rtnetlink.h>
  23 #include <linux/bitmap.h>
  24 #include <net/cfg80211.h>
  25
  26 #include "ieee80211_common.h"
  27 #include "ieee80211_i.h"
  28 #include "ieee80211_rate.h"
  29 #include "wep.h"
  30 #include "wme.h"
  31 #include "aes_ccm.h"
  32 #include "ieee80211_led.h"
  33 #include "ieee80211_cfg.h"
  34 #include "debugfs.h"
  35 #include "debugfs_netdev.h"
  36
  37 /*
  38  * For seeing transmitted packets on monitor interfaces
  39  * we have a radiotap header too.
  40  */
  41 struct ieee80211_tx_status_rtap_hdr {
  42         struct ieee80211_radiotap_header hdr;
  43         __le16 tx_flags;
  44         u8 data_retries;
  45 } __attribute__ ((packed));
  46
  47 /* common interface routines */
  48
  49 static struct net_device_stats *ieee80211_get_stats(struct net_device *dev)
  50 {
  51         struct ieee80211_sub_if_data *sdata;
  52         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
  53         return &(sdata->stats);
  54 }
  55
  56 static int header_parse_80211(struct sk_buff *skb, unsigned char *haddr)
  57 {
  58         memcpy(haddr, skb_mac_header(skb) + 10, ETH_ALEN); /* addr2 */
  59         return ETH_ALEN;
  60 }
  61
  62 /* master interface */
  63
  64 static int ieee80211_master_open(struct net_device *dev)
  65 {
  66         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
  67         struct ieee80211_sub_if_data *sdata;
  68         int res = -EOPNOTSUPP;
  69
  70         read_lock(&local->sub_if_lock);
  71         list_for_each_entry(sdata, &local->sub_if_list, list) {
  72                 if (sdata->dev != dev && netif_running(sdata->dev)) {
  73                         res = 0;
  74                         break;
  75                 }
  76         }
  77         read_unlock(&local->sub_if_lock);
  78         return res;
  79 }
  80
  81 static int ieee80211_master_stop(struct net_device *dev)
  82 {
  83         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
  84         struct ieee80211_sub_if_data *sdata;
  85
  86         read_lock(&local->sub_if_lock);
  87         list_for_each_entry(sdata, &local->sub_if_list, list)
  88                 if (sdata->dev != dev && netif_running(sdata->dev))
  89                         dev_close(sdata->dev);
  90         read_unlock(&local->sub_if_lock);
  91
  92         return 0;
  93 }
  94
  95 /* management interface */
  96
  97 static void
  98 ieee80211_fill_frame_info(struct ieee80211_local *local,
  99                           struct ieee80211_frame_info *fi,
 100                           struct ieee80211_rx_status *status)
 101 {
 102         if (status) {
 103                 struct timespec ts;
 104                 struct ieee80211_rate *rate;
 105
 106                 jiffies_to_timespec(jiffies, &ts);
 107                 fi->hosttime = cpu_to_be64((u64) ts.tv_sec * 1000000 +
 108                                            ts.tv_nsec / 1000);
 109                 fi->mactime = cpu_to_be64(status->mactime);
 110                 switch (status->phymode) {
 111                 case MODE_IEEE80211A:
 112                         fi->phytype = htonl(ieee80211_phytype_ofdm_dot11_a);
 113                         break;
 114                 case MODE_IEEE80211B:
 115                         fi->phytype = htonl(ieee80211_phytype_dsss_dot11_b);
 116                         break;
 117                 case MODE_IEEE80211G:
 118                         fi->phytype = htonl(ieee80211_phytype_pbcc_dot11_g);
 119                         break;
 120                 case MODE_ATHEROS_TURBO:
 121                         fi->phytype =
 122                                 htonl(ieee80211_phytype_dsss_dot11_turbo);
 123                         break;
 124                 default:
 125                         fi->phytype = htonl(0xAAAAAAAA);
 126                         break;
 127                 }
 128                 fi->channel = htonl(status->channel);
 129                 rate = ieee80211_get_rate(local, status->phymode,
 130                                           status->rate);
 131                 if (rate) {
 132                         fi->datarate = htonl(rate->rate);
 133                         if (rate->flags & IEEE80211_RATE_PREAMBLE2) {
 134                                 if (status->rate == rate->val)
 135                                         fi->preamble = htonl(2); /* long */
 136                                 else if (status->rate == rate->val2)
 137                                         fi->preamble = htonl(1); /* short */
 138                         } else
 139                                 fi->preamble = htonl(0);
 140                 } else {
 141                         fi->datarate = htonl(0);
 142                         fi->preamble = htonl(0);
 143                 }
 144
 145                 fi->antenna = htonl(status->antenna);
 146                 fi->priority = htonl(0xffffffff); /* no clue */
 147                 fi->ssi_type = htonl(ieee80211_ssi_raw);
 148                 fi->ssi_signal = htonl(status->ssi);
 149                 fi->ssi_noise = 0x00000000;
 150                 fi->encoding = 0;
 151         } else {
 152                 /* clear everything because we really don't know.
 153                  * the msg_type field isn't present on monitor frames
 154                  * so we don't know whether it will be present or not,
 155                  * but it's ok to not clear it since it'll be assigned
 156                  * anyway */
 157                 memset(fi, 0, sizeof(*fi) - sizeof(fi->msg_type));
 158
 159                 fi->ssi_type = htonl(ieee80211_ssi_none);
 160         }
 161         fi->version = htonl(IEEE80211_FI_VERSION);
 162         fi->length = cpu_to_be32(sizeof(*fi) - sizeof(fi->msg_type));
 163 }
 164
 165 /* this routine is actually not just for this, but also
 166  * for pushing fake 'management' frames into userspace.
 167  * it shall be replaced by a netlink-based system. */
 168 void
 169 ieee80211_rx_mgmt(struct ieee80211_local *local, struct sk_buff *skb,
 170                   struct ieee80211_rx_status *status, u32 msg_type)
 171 {
 172         struct ieee80211_frame_info *fi;
 173         const size_t hlen = sizeof(struct ieee80211_frame_info);
 174         struct ieee80211_sub_if_data *sdata;
 175
 176         skb->dev = local->apdev;
 177
 178         sdata = IEEE80211_DEV_TO_SUB_IF(local->apdev);
 179
 180         if (skb_headroom(skb) < hlen) {
 181                 I802_DEBUG_INC(local->rx_expand_skb_head);
 182                 if (pskb_expand_head(skb, hlen, 0, GFP_ATOMIC)) {
 183                         dev_kfree_skb(skb);
 184                         return;
 185                 }
 186         }
 187
 188         fi = (struct ieee80211_frame_info *) skb_push(skb, hlen);
 189
 190         ieee80211_fill_frame_info(local, fi, status);
 191         fi->msg_type = htonl(msg_type);
 192
 193         sdata->stats.rx_packets++;
 194         sdata->stats.rx_bytes += skb->len;
 195
 196         skb_set_mac_header(skb, 0);
 197         skb->ip_summed = CHECKSUM_UNNECESSARY;
 198         skb->pkt_type = PACKET_OTHERHOST;
 199         skb->protocol = htons(ETH_P_802_2);
 200         memset(skb->cb, 0, sizeof(skb->cb));
 201         netif_rx(skb);
 202 }
 203
 204 int ieee80211_radar_status(struct ieee80211_hw *hw, int channel,
 205                            int radar, int radar_type)
 206 {
 207         struct sk_buff *skb;
 208         struct ieee80211_radar_info *msg;
 209         struct ieee80211_local *local = hw_to_local(hw);
 210
 211         if (!local->apdev)
 212                 return 0;
 213
 214         skb = dev_alloc_skb(sizeof(struct ieee80211_frame_info) +
 215                             sizeof(struct ieee80211_radar_info));
 216
 217         if (!skb)
 218                 return -ENOMEM;
 219         skb_reserve(skb, sizeof(struct ieee80211_frame_info));
 220
 221         msg = (struct ieee80211_radar_info *)
 222                 skb_put(skb, sizeof(struct ieee80211_radar_info));
 223         msg->channel = channel;
 224         msg->radar = radar;
 225         msg->radar_type = radar_type;
 226
 227         ieee80211_rx_mgmt(local, skb, NULL, ieee80211_msg_radar);
 228         return 0;
 229 }
 230 EXPORT_SYMBOL(ieee80211_radar_status);
 231
 232 void ieee80211_key_threshold_notify(struct net_device *dev,
 233                                     struct ieee80211_key *key,
 234                                     struct sta_info *sta)
 235 {
 236         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 237         struct sk_buff *skb;
 238         struct ieee80211_msg_key_notification *msg;
 239
 240         /* if no one will get it anyway, don't even allocate it.
 241          * unlikely because this is only relevant for APs
 242          * where the device must be open... */
 243         if (unlikely(!local->apdev))
 244                 return;
 245
 246         skb = dev_alloc_skb(sizeof(struct ieee80211_frame_info) +
 247                             sizeof(struct ieee80211_msg_key_notification));
 248         if (!skb)
 249                 return;
 250
 251         skb_reserve(skb, sizeof(struct ieee80211_frame_info));
 252         msg = (struct ieee80211_msg_key_notification *)
 253                 skb_put(skb, sizeof(struct ieee80211_msg_key_notification));
 254         msg->tx_rx_count = key->tx_rx_count;
 255         memcpy(msg->ifname, dev->name, IFNAMSIZ);
 256         if (sta)
 257                 memcpy(msg->addr, sta->addr, ETH_ALEN);
 258         else
 259                 memset(msg->addr, 0xff, ETH_ALEN);
 260
 261         key->tx_rx_count = 0;
 262
 263         ieee80211_rx_mgmt(local, skb, NULL,
 264                           ieee80211_msg_key_threshold_notification);
 265 }
 266
 267 static int ieee80211_mgmt_open(struct net_device *dev)
 268 {
 269         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 270
 271         if (!netif_running(local->mdev))
 272                 return -EOPNOTSUPP;
 273         return 0;
 274 }
 275
 276 static int ieee80211_mgmt_stop(struct net_device *dev)
 277 {
 278         return 0;
 279 }
 280
 281 static int ieee80211_change_mtu_apdev(struct net_device *dev, int new_mtu)
 282 {
 283         /* FIX: what would be proper limits for MTU?
 284          * This interface uses 802.11 frames. */
 285         if (new_mtu < 256 || new_mtu > IEEE80211_MAX_DATA_LEN) {
 286                 printk(KERN_WARNING "%s: invalid MTU %d\n",
 287                        dev->name, new_mtu);
 288                 return -EINVAL;
 289         }
 290
 291 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 292         printk(KERN_DEBUG "%s: setting MTU %d\n", dev->name, new_mtu);
 293 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
 294         dev->mtu = new_mtu;
 295         return 0;
 296 }
 297
 298 void ieee80211_if_mgmt_setup(struct net_device *dev)
 299 {
 300         ether_setup(dev);
 301         dev->hard_start_xmit = ieee80211_mgmt_start_xmit;
 302         dev->change_mtu = ieee80211_change_mtu_apdev;
 303         dev->get_stats = ieee80211_get_stats;
 304         dev->open = ieee80211_mgmt_open;
 305         dev->stop = ieee80211_mgmt_stop;
 306         dev->type = ARPHRD_IEEE80211_PRISM;
 307         dev->hard_header_parse = header_parse_80211;
 308         dev->uninit = ieee80211_if_reinit;
 309         dev->destructor = ieee80211_if_free;
 310 }
 311
 312 /* regular interfaces */
 313
 314 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
 315 {
 316         /* FIX: what would be proper limits for MTU?
 317          * This interface uses 802.3 frames. */
 318         if (new_mtu < 256 || new_mtu > IEEE80211_MAX_DATA_LEN - 24 - 6) {
 319                 printk(KERN_WARNING "%s: invalid MTU %d\n",
 320                        dev->name, new_mtu);
 321                 return -EINVAL;
 322         }
 323
 324 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 325         printk(KERN_DEBUG "%s: setting MTU %d\n", dev->name, new_mtu);
 326 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
 327         dev->mtu = new_mtu;
 328         return 0;
 329 }
 330
 331 static inline int identical_mac_addr_allowed(int type1, int type2)
 332 {
 333         return (type1 == IEEE80211_IF_TYPE_MNTR ||
 334                 type2 == IEEE80211_IF_TYPE_MNTR ||
 335                 (type1 == IEEE80211_IF_TYPE_AP &&
 336                  type2 == IEEE80211_IF_TYPE_WDS) ||
 337                 (type1 == IEEE80211_IF_TYPE_WDS &&
 338                  (type2 == IEEE80211_IF_TYPE_WDS ||
 339                   type2 == IEEE80211_IF_TYPE_AP)) ||
 340                 (type1 == IEEE80211_IF_TYPE_AP &&
 341                  type2 == IEEE80211_IF_TYPE_VLAN) ||
 342                 (type1 == IEEE80211_IF_TYPE_VLAN &&
 343                  (type2 == IEEE80211_IF_TYPE_AP ||
 344                   type2 == IEEE80211_IF_TYPE_VLAN)));
 345 }
 346
 347 /* Check if running monitor interfaces should go to a "soft monitor" mode
 348  * and switch them if necessary. */
 349 static inline void ieee80211_start_soft_monitor(struct ieee80211_local *local)
 350 {
 351         struct ieee80211_if_init_conf conf;
 352
 353         if (local->open_count && local->open_count == local->monitors &&
 354             !(local->hw.flags & IEEE80211_HW_MONITOR_DURING_OPER) &&
 355             local->ops->remove_interface) {
 356                 conf.if_id = -1;
 357                 conf.type = IEEE80211_IF_TYPE_MNTR;
 358                 conf.mac_addr = NULL;
 359                 local->ops->remove_interface(local_to_hw(local), &conf);
 360         }
 361 }
 362
 363 /* Check if running monitor interfaces should go to a "hard monitor" mode
 364  * and switch them if necessary. */
 365 static void ieee80211_start_hard_monitor(struct ieee80211_local *local)
 366 {
 367         struct ieee80211_if_init_conf conf;
 368
 369         if (local->open_count && local->open_count == local->monitors &&
 370             !(local->hw.flags & IEEE80211_HW_MONITOR_DURING_OPER)) {
 371                 conf.if_id = -1;
 372                 conf.type = IEEE80211_IF_TYPE_MNTR;
 373                 conf.mac_addr = NULL;
 374                 local->ops->add_interface(local_to_hw(local), &conf);
 375         }
 376 }
 377
 378 static void ieee80211_if_open(struct net_device *dev)
 379 {
 380         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 381
 382         switch (sdata->type) {
 383         case IEEE80211_IF_TYPE_STA:
 384         case IEEE80211_IF_TYPE_IBSS:
 385                 sdata->u.sta.prev_bssid_set = 0;
 386                 break;
 387         }
 388 }
 389
 390 static int ieee80211_open(struct net_device *dev)
 391 {
 392         struct ieee80211_sub_if_data *sdata, *nsdata;
 393         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 394         struct ieee80211_if_init_conf conf;
 395         int res;
 396
 397         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 398         read_lock(&local->sub_if_lock);
 399         list_for_each_entry(nsdata, &local->sub_if_list, list) {
 400                 struct net_device *ndev = nsdata->dev;
 401
 402                 if (ndev != dev && ndev != local->mdev && netif_running(ndev) &&
 403                     compare_ether_addr(dev->dev_addr, ndev->dev_addr) == 0 &&
 404                     !identical_mac_addr_allowed(sdata->type, nsdata->type)) {
 405                         read_unlock(&local->sub_if_lock);
 406                         return -ENOTUNIQ;
 407                 }
 408         }
 409         read_unlock(&local->sub_if_lock);
 410
 411         if (sdata->type == IEEE80211_IF_TYPE_WDS &&
 412             is_zero_ether_addr(sdata->u.wds.remote_addr))
 413                 return -ENOLINK;
 414
 415         if (sdata->type == IEEE80211_IF_TYPE_MNTR && local->open_count &&
 416             !(local->hw.flags & IEEE80211_HW_MONITOR_DURING_OPER)) {
 417                 /* run the interface in a "soft monitor" mode */
 418                 local->monitors++;
 419                 local->open_count++;
 420                 local->hw.conf.flags |= IEEE80211_CONF_RADIOTAP;
 421                 return 0;
 422         }
 423         ieee80211_if_open(dev);
 424         ieee80211_start_soft_monitor(local);
 425
 426         conf.if_id = dev->ifindex;
 427         conf.type = sdata->type;
 428         conf.mac_addr = dev->dev_addr;
 429         res = local->ops->add_interface(local_to_hw(local), &conf);
 430         if (res) {
 431                 if (sdata->type == IEEE80211_IF_TYPE_MNTR)
 432                         ieee80211_start_hard_monitor(local);
 433                 return res;
 434         }
 435
 436         if (local->open_count == 0) {
 437                 res = 0;
 438                 tasklet_enable(&local->tx_pending_tasklet);
 439                 tasklet_enable(&local->tasklet);
 440                 if (local->ops->open)
 441                         res = local->ops->open(local_to_hw(local));
 442                 if (res == 0) {
 443                         res = dev_open(local->mdev);
 444                         if (res) {
 445                                 if (local->ops->stop)
 446                                         local->ops->stop(local_to_hw(local));
 447                         } else {
 448                                 res = ieee80211_hw_config(local);
 449                                 if (res && local->ops->stop)
 450                                         local->ops->stop(local_to_hw(local));
 451                                 else if (!res && local->apdev)
 452                                         dev_open(local->apdev);
 453                         }
 454                 }
 455                 if (res) {
 456                         if (local->ops->remove_interface)
 457                                 local->ops->remove_interface(local_to_hw(local),
 458                                                             &conf);
 459                         return res;
 460                 }
 461         }
 462         local->open_count++;
 463
 464         if (sdata->type == IEEE80211_IF_TYPE_MNTR) {
 465                 local->monitors++;
 466                 local->hw.conf.flags |= IEEE80211_CONF_RADIOTAP;
 467         } else {
 468                 ieee80211_if_config(dev);
 469                 ieee80211_reset_erp_info(dev);
 470         }
 471
 472         if (sdata->type == IEEE80211_IF_TYPE_STA &&
 473             !local->user_space_mlme)
 474                 netif_carrier_off(dev);
 475         else
 476                 netif_carrier_on(dev);
 477
 478         netif_start_queue(dev);
 479         return 0;
 480 }
 481
 482 static void ieee80211_if_shutdown(struct net_device *dev)
 483 {
 484         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 485         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 486
 487         ASSERT_RTNL();
 488         switch (sdata->type) {
 489         case IEEE80211_IF_TYPE_STA:
 490         case IEEE80211_IF_TYPE_IBSS:
 491                 sdata->u.sta.state = IEEE80211_DISABLED;
 492                 del_timer_sync(&sdata->u.sta.timer);
 493                 skb_queue_purge(&sdata->u.sta.skb_queue);
 494                 if (!local->ops->hw_scan &&
 495                     local->scan_dev == sdata->dev) {
 496                         local->sta_scanning = 0;
 497                         cancel_delayed_work(&local->scan_work);
 498                 }
 499                 flush_workqueue(local->hw.workqueue);
 500                 break;
 501         }
 502 }
 503
 504 static int ieee80211_stop(struct net_device *dev)
 505 {
 506         struct ieee80211_sub_if_data *sdata;
 507         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 508
 509         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 510
 511         if (sdata->type == IEEE80211_IF_TYPE_MNTR &&
 512             local->open_count > 1 &&
 513             !(local->hw.flags & IEEE80211_HW_MONITOR_DURING_OPER)) {
 514                 /* remove "soft monitor" interface */
 515                 local->open_count--;
 516                 local->monitors--;
 517                 if (!local->monitors)
 518                         local->hw.conf.flags &= ~IEEE80211_CONF_RADIOTAP;
 519                 return 0;
 520         }
 521
 522         netif_stop_queue(dev);
 523         ieee80211_if_shutdown(dev);
 524
 525         if (sdata->type == IEEE80211_IF_TYPE_MNTR) {
 526                 local->monitors--;
 527                 if (!local->monitors)
 528                         local->hw.conf.flags &= ~IEEE80211_CONF_RADIOTAP;
 529         }
 530
 531         local->open_count--;
 532         if (local->open_count == 0) {
 533                 if (netif_running(local->mdev))
 534                         dev_close(local->mdev);
 535                 if (local->apdev)
 536                         dev_close(local->apdev);
 537                 if (local->ops->stop)
 538                         local->ops->stop(local_to_hw(local));
 539                 tasklet_disable(&local->tx_pending_tasklet);
 540                 tasklet_disable(&local->tasklet);
 541         }
 542         if (local->ops->remove_interface) {
 543                 struct ieee80211_if_init_conf conf;
 544
 545                 conf.if_id = dev->ifindex;
 546                 conf.type = sdata->type;
 547                 conf.mac_addr = dev->dev_addr;
 548                 local->ops->remove_interface(local_to_hw(local), &conf);
 549         }
 550
 551         ieee80211_start_hard_monitor(local);
 552
 553         return 0;
 554 }
 555
 556 enum netif_tx_lock_class {
 557         TX_LOCK_NORMAL,
 558         TX_LOCK_MASTER,
 559 };
 560
 561 static inline void netif_tx_lock_nested(struct net_device *dev, int subclass)
 562 {
 563         spin_lock_nested(&dev->_xmit_lock, subclass);
 564         dev->xmit_lock_owner = smp_processor_id();
 565 }
 566
 567 static void ieee80211_set_multicast_list(struct net_device *dev)
 568 {
 569         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 570         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 571         unsigned short flags;
 572
 573         netif_tx_lock_nested(local->mdev, TX_LOCK_MASTER);
 574         if (((dev->flags & IFF_ALLMULTI) != 0) ^ (sdata->allmulti != 0)) {
 575                 if (sdata->allmulti) {
 576                         sdata->allmulti = 0;
 577                         local->iff_allmultis--;
 578                 } else {
 579                         sdata->allmulti = 1;
 580                         local->iff_allmultis++;
 581                 }
 582         }
 583         if (((dev->flags & IFF_PROMISC) != 0) ^ (sdata->promisc != 0)) {
 584                 if (sdata->promisc) {
 585                         sdata->promisc = 0;
 586                         local->iff_promiscs--;
 587                 } else {
 588                         sdata->promisc = 1;
 589                         local->iff_promiscs++;
 590                 }
 591         }
 592         if (dev->mc_count != sdata->mc_count) {
 593                 local->mc_count = local->mc_count - sdata->mc_count +
 594                                   dev->mc_count;
 595                 sdata->mc_count = dev->mc_count;
 596         }
 597         if (local->ops->set_multicast_list) {
 598                 flags = local->mdev->flags;
 599                 if (local->iff_allmultis)
 600                         flags |= IFF_ALLMULTI;
 601                 if (local->iff_promiscs)
 602                         flags |= IFF_PROMISC;
 603                 read_lock(&local->sub_if_lock);
 604                 local->ops->set_multicast_list(local_to_hw(local), flags,
 605                                               local->mc_count);
 606                 read_unlock(&local->sub_if_lock);
 607         }
 608         netif_tx_unlock(local->mdev);
 609 }
 610
 611 /* Must not be called for mdev and apdev */
 612 void ieee80211_if_setup(struct net_device *dev)
 613 {
 614         ether_setup(dev);
 615         dev->hard_start_xmit = ieee80211_subif_start_xmit;
 616         dev->wireless_handlers = &ieee80211_iw_handler_def;
 617         dev->set_multicast_list = ieee80211_set_multicast_list;
 618         dev->change_mtu = ieee80211_change_mtu;
 619         dev->get_stats = ieee80211_get_stats;
 620         dev->open = ieee80211_open;
 621         dev->stop = ieee80211_stop;
 622         dev->uninit = ieee80211_if_reinit;
 623         dev->destructor = ieee80211_if_free;
 624 }
 625
 626 /* WDS specialties */
 627
 628 int ieee80211_if_update_wds(struct net_device *dev, u8 *remote_addr)
 629 {
 630         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 631         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 632         struct sta_info *sta;
 633
 634         if (compare_ether_addr(remote_addr, sdata->u.wds.remote_addr) == 0)
 635                 return 0;
 636
 637         /* Create STA entry for the new peer */
 638         sta = sta_info_add(local, dev, remote_addr, GFP_KERNEL);
 639         if (!sta)
 640                 return -ENOMEM;
 641         sta_info_put(sta);
 642
 643         /* Remove STA entry for the old peer */
 644         sta = sta_info_get(local, sdata->u.wds.remote_addr);
 645         if (sta) {
 646                 sta_info_free(sta);
 647                 sta_info_put(sta);
 648         } else {
 649                 printk(KERN_DEBUG "%s: could not find STA entry for WDS link "
 650                        "peer " MAC_FMT "\n",
 651                        dev->name, MAC_ARG(sdata->u.wds.remote_addr));
 652         }
 653
 654         /* Update WDS link data */
 655         memcpy(&sdata->u.wds.remote_addr, remote_addr, ETH_ALEN);
 656
 657         return 0;
 658 }
 659
 660 /* everything else */
 661
 662 static int __ieee80211_if_config(struct net_device *dev,
 663                                  struct sk_buff *beacon,
 664                                  struct ieee80211_tx_control *control)
 665 {
 666         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 667         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 668         struct ieee80211_if_conf conf;
 669         static u8 scan_bssid[] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
 670
 671         if (!local->ops->config_interface || !netif_running(dev))
 672                 return 0;
 673
 674         memset(&conf, 0, sizeof(conf));
 675         conf.type = sdata->type;
 676         if (sdata->type == IEEE80211_IF_TYPE_STA ||
 677             sdata->type == IEEE80211_IF_TYPE_IBSS) {
 678                 if (local->sta_scanning &&
 679                     local->scan_dev == dev)
 680                         conf.bssid = scan_bssid;
 681                 else
 682                         conf.bssid = sdata->u.sta.bssid;
 683                 conf.ssid = sdata->u.sta.ssid;
 684                 conf.ssid_len = sdata->u.sta.ssid_len;
 685                 conf.generic_elem = sdata->u.sta.extra_ie;
 686                 conf.generic_elem_len = sdata->u.sta.extra_ie_len;
 687         } else if (sdata->type == IEEE80211_IF_TYPE_AP) {
 688                 conf.ssid = sdata->u.ap.ssid;
 689                 conf.ssid_len = sdata->u.ap.ssid_len;
 690                 conf.generic_elem = sdata->u.ap.generic_elem;
 691                 conf.generic_elem_len = sdata->u.ap.generic_elem_len;
 692                 conf.beacon = beacon;
 693                 conf.beacon_control = control;
 694         }
 695         return local->ops->config_interface(local_to_hw(local),
 696                                            dev->ifindex, &conf);
 697 }
 698
 699 int ieee80211_if_config(struct net_device *dev)
 700 {
 701         return __ieee80211_if_config(dev, NULL, NULL);
 702 }
 703
 704 int ieee80211_if_config_beacon(struct net_device *dev)
 705 {
 706         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 707         struct ieee80211_tx_control control;
 708         struct sk_buff *skb;
 709
 710         if (!(local->hw.flags & IEEE80211_HW_HOST_GEN_BEACON_TEMPLATE))
 711                 return 0;
 712         skb = ieee80211_beacon_get(local_to_hw(local), dev->ifindex, &control);
 713         if (!skb)
 714                 return -ENOMEM;
 715         return __ieee80211_if_config(dev, skb, &control);
 716 }
 717
 718 int ieee80211_hw_config(struct ieee80211_local *local)
 719 {
 720         struct ieee80211_hw_mode *mode;
 721         struct ieee80211_channel *chan;
 722         int ret = 0;
 723
 724         if (local->sta_scanning) {
 725                 chan = local->scan_channel;
 726                 mode = local->scan_hw_mode;
 727         } else {
 728                 chan = local->oper_channel;
 729                 mode = local->oper_hw_mode;
 730         }
 731
 732         local->hw.conf.channel = chan->chan;
 733         local->hw.conf.channel_val = chan->val;
 734         local->hw.conf.power_level = chan->power_level;
 735         local->hw.conf.freq = chan->freq;
 736         local->hw.conf.phymode = mode->mode;
 737         local->hw.conf.antenna_max = chan->antenna_max;
 738         local->hw.conf.chan = chan;
 739         local->hw.conf.mode = mode;
 740
 741 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 742         printk(KERN_DEBUG "HW CONFIG: channel=%d freq=%d "
 743                "phymode=%d\n", local->hw.conf.channel, local->hw.conf.freq,
 744                local->hw.conf.phymode);
 745 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
 746
 747         if (local->ops->config)
 748                 ret = local->ops->config(local_to_hw(local), &local->hw.conf);
 749
 750         return ret;
 751 }
 752
 753 void ieee80211_erp_info_change_notify(struct net_device *dev, u8 changes)
 754 {
 755         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 756         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 757         if (local->ops->erp_ie_changed)
 758                 local->ops->erp_ie_changed(local_to_hw(local), changes,
 759                                            sdata->use_protection,
 760                                            !sdata->short_preamble);
 761 }
 762
 763 void ieee80211_reset_erp_info(struct net_device *dev)
 764 {
 765         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 766
 767         sdata->short_preamble = 0;
 768         sdata->use_protection = 0;
 769         ieee80211_erp_info_change_notify(dev,
 770                                          IEEE80211_ERP_CHANGE_PROTECTION |
 771                                          IEEE80211_ERP_CHANGE_PREAMBLE);
 772 }
 773
 774 struct dev_mc_list *ieee80211_get_mc_list_item(struct ieee80211_hw *hw,
 775                                                struct dev_mc_list *prev,
 776                                                void **ptr)
 777 {
 778         struct ieee80211_local *local = hw_to_local(hw);
 779         struct ieee80211_sub_if_data *sdata = *ptr;
 780         struct dev_mc_list *mc;
 781
 782         if (!prev) {
 783                 WARN_ON(sdata);
 784                 sdata = NULL;
 785         }
 786         if (!prev || !prev->next) {
 787                 if (sdata)
 788                         sdata = list_entry(sdata->list.next,
 789                                            struct ieee80211_sub_if_data, list);
 790                 else
 791                         sdata = list_entry(local->sub_if_list.next,
 792                                            struct ieee80211_sub_if_data, list);
 793                 if (&sdata->list != &local->sub_if_list)
 794                         mc = sdata->dev->mc_list;
 795                 else
 796                         mc = NULL;
 797         } else
 798                 mc = prev->next;
 799
 800         *ptr = sdata;
 801         return mc;
 802 }
 803 EXPORT_SYMBOL(ieee80211_get_mc_list_item);
 804
 805 static void ieee80211_stat_refresh(unsigned long data)
 806 {
 807         struct ieee80211_local *local = (struct ieee80211_local *) data;
 808         struct sta_info *sta;
 809         struct ieee80211_sub_if_data *sdata;
 810
 811         if (!local->stat_time)
 812                 return;
 813
 814         /* go through all stations */
 815         read_lock_bh(&local->sta_lock);
 816         list_for_each_entry(sta, &local->sta_list, list) {
 817                 sta->channel_use = (sta->channel_use_raw / local->stat_time) /
 818                         CHAN_UTIL_PER_10MS;
 819                 sta->channel_use_raw = 0;
 820         }
 821         read_unlock_bh(&local->sta_lock);
 822
 823         /* go through all subinterfaces */
 824         read_lock(&local->sub_if_lock);
 825         list_for_each_entry(sdata, &local->sub_if_list, list) {
 826                 sdata->channel_use = (sdata->channel_use_raw /
 827                                       local->stat_time) / CHAN_UTIL_PER_10MS;
 828                 sdata->channel_use_raw = 0;
 829         }
 830         read_unlock(&local->sub_if_lock);
 831
 832         /* hardware interface */
 833         local->channel_use = (local->channel_use_raw /
 834                               local->stat_time) / CHAN_UTIL_PER_10MS;
 835         local->channel_use_raw = 0;
 836
 837         local->stat_timer.expires = jiffies + HZ * local->stat_time / 100;
 838         add_timer(&local->stat_timer);
 839 }
 840
 841 void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
 842                                  struct sk_buff *skb,
 843                                  struct ieee80211_tx_status *status)
 844 {
 845         struct ieee80211_local *local = hw_to_local(hw);
 846         struct ieee80211_tx_status *saved;
 847         int tmp;
 848
 849         skb->dev = local->mdev;
 850         saved = kmalloc(sizeof(struct ieee80211_tx_status), GFP_ATOMIC);
 851         if (unlikely(!saved)) {
 852                 if (net_ratelimit())
 853                         printk(KERN_WARNING "%s: Not enough memory, "
 854                                "dropping tx status", skb->dev->name);
 855                 /* should be dev_kfree_skb_irq, but due to this function being
 856                  * named _irqsafe instead of just _irq we can't be sure that
 857                  * people won't call it from non-irq contexts */
 858                 dev_kfree_skb_any(skb);
 859                 return;
 860         }
 861         memcpy(saved, status, sizeof(struct ieee80211_tx_status));
 862         /* copy pointer to saved status into skb->cb for use by tasklet */
 863         memcpy(skb->cb, &saved, sizeof(saved));
 864
 865         skb->pkt_type = IEEE80211_TX_STATUS_MSG;
 866         skb_queue_tail(status->control.flags & IEEE80211_TXCTL_REQ_TX_STATUS ?
 867                        &local->skb_queue : &local->skb_queue_unreliable, skb);
 868         tmp = skb_queue_len(&local->skb_queue) +
 869                 skb_queue_len(&local->skb_queue_unreliable);
 870         while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
 871                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 872                 memcpy(&saved, skb->cb, sizeof(saved));
 873                 kfree(saved);
 874                 dev_kfree_skb_irq(skb);
 875                 tmp--;
 876                 I802_DEBUG_INC(local->tx_status_drop);
 877         }
 878         tasklet_schedule(&local->tasklet);
 879 }
 880 EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
 881
 882 static void ieee80211_tasklet_handler(unsigned long data)
 883 {
 884         struct ieee80211_local *local = (struct ieee80211_local *) data;
 885         struct sk_buff *skb;
 886         struct ieee80211_rx_status rx_status;
 887         struct ieee80211_tx_status *tx_status;
 888
 889         while ((skb = skb_dequeue(&local->skb_queue)) ||
 890                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 891                 switch (skb->pkt_type) {
 892                 case IEEE80211_RX_MSG:
 893                         /* status is in skb->cb */
 894                         memcpy(&rx_status, skb->cb, sizeof(rx_status));
 895                         /* Clear skb->type in order to not confuse kernel
 896                          * netstack. */
 897                         skb->pkt_type = 0;
 898                         __ieee80211_rx(local_to_hw(local), skb, &rx_status);
 899                         break;
 900                 case IEEE80211_TX_STATUS_MSG:
 901                         /* get pointer to saved status out of skb->cb */
 902                         memcpy(&tx_status, skb->cb, sizeof(tx_status));
 903                         skb->pkt_type = 0;
 904                         ieee80211_tx_status(local_to_hw(local),
 905                                             skb, tx_status);
 906                         kfree(tx_status);
 907                         break;
 908                 default: /* should never get here! */
 909                         printk(KERN_ERR "%s: Unknown message type (%d)\n",
 910                                local->mdev->name, skb->pkt_type);
 911                         dev_kfree_skb(skb);
 912                         break;
 913                 }
 914         }
 915 }
 916
 917 /* Remove added headers (e.g., QoS control), encryption header/MIC, etc. to
 918  * make a prepared TX frame (one that has been given to hw) to look like brand
 919  * new IEEE 802.11 frame that is ready to go through TX processing again.
 920  * Also, tx_packet_data in cb is restored from tx_control. */
 921 static void ieee80211_remove_tx_extra(struct ieee80211_local *local,
 922                                       struct ieee80211_key *key,
 923                                       struct sk_buff *skb,
 924                                       struct ieee80211_tx_control *control)
 925 {
 926         int hdrlen, iv_len, mic_len;
 927         struct ieee80211_tx_packet_data *pkt_data;
 928
 929         pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
 930         pkt_data->ifindex = control->ifindex;
 931         pkt_data->mgmt_iface = (control->type == IEEE80211_IF_TYPE_MGMT);
 932         pkt_data->req_tx_status = !!(control->flags & IEEE80211_TXCTL_REQ_TX_STATUS);
 933         pkt_data->do_not_encrypt = !!(control->flags & IEEE80211_TXCTL_DO_NOT_ENCRYPT);
 934         pkt_data->requeue = !!(control->flags & IEEE80211_TXCTL_REQUEUE);
 935         pkt_data->queue = control->queue;
 936
 937         hdrlen = ieee80211_get_hdrlen_from_skb(skb);
 938
 939         if (!key)
 940                 goto no_key;
 941
 942         switch (key->alg) {
 943         case ALG_WEP:
 944                 iv_len = WEP_IV_LEN;
 945                 mic_len = WEP_ICV_LEN;
 946                 break;
 947         case ALG_TKIP:
 948                 iv_len = TKIP_IV_LEN;
 949                 mic_len = TKIP_ICV_LEN;
 950                 break;
 951         case ALG_CCMP:
 952                 iv_len = CCMP_HDR_LEN;
 953                 mic_len = CCMP_MIC_LEN;
 954                 break;
 955         default:
 956                 goto no_key;
 957         }
 958
 959         if (skb->len >= mic_len && key->force_sw_encrypt)
 960                 skb_trim(skb, skb->len - mic_len);
 961         if (skb->len >= iv_len && skb->len > hdrlen) {
 962                 memmove(skb->data + iv_len, skb->data, hdrlen);
 963                 skb_pull(skb, iv_len);
 964         }
 965
 966 no_key:
 967         {
 968                 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 969                 u16 fc = le16_to_cpu(hdr->frame_control);
 970                 if ((fc & 0x8C) == 0x88) /* QoS Control Field */ {
 971                         fc &= ~IEEE80211_STYPE_QOS_DATA;
 972                         hdr->frame_control = cpu_to_le16(fc);
 973                         memmove(skb->data + 2, skb->data, hdrlen - 2);
 974                         skb_pull(skb, 2);
 975                 }
 976         }
 977 }
 978
 979 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb,
 980                          struct ieee80211_tx_status *status)
 981 {
 982         struct sk_buff *skb2;
 983         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 984         struct ieee80211_local *local = hw_to_local(hw);
 985         u16 frag, type;
 986         u32 msg_type;
 987         struct ieee80211_tx_status_rtap_hdr *rthdr;
 988         struct ieee80211_sub_if_data *sdata;
 989         int monitors;
 990
 991         if (!status) {
 992                 printk(KERN_ERR
 993                        "%s: ieee80211_tx_status called with NULL status\n",
 994                        local->mdev->name);
 995                 dev_kfree_skb(skb);
 996                 return;
 997         }
 998
 999         if (status->excessive_retries) {
1000                 struct sta_info *sta;
1001                 sta = sta_info_get(local, hdr->addr1);
1002                 if (sta) {
1003                         if (sta->flags & WLAN_STA_PS) {
1004                                 /* The STA is in power save mode, so assume
1005                                  * that this TX packet failed because of that.
1006                                  */
1007                                 status->excessive_retries = 0;
1008                                 status->flags |= IEEE80211_TX_STATUS_TX_FILTERED;
1009                         }
1010                         sta_info_put(sta);
1011                 }
1012         }
1013
1014         if (status->flags & IEEE80211_TX_STATUS_TX_FILTERED) {
1015                 struct sta_info *sta;
1016                 sta = sta_info_get(local, hdr->addr1);
1017                 if (sta) {
1018                         sta->tx_filtered_count++;
1019
1020                         /* Clear the TX filter mask for this STA when sending
1021                          * the next packet. If the STA went to power save mode,
1022                          * this will happen when it is waking up for the next
1023                          * time. */
1024                         sta->clear_dst_mask = 1;
1025
1026                         /* TODO: Is the WLAN_STA_PS flag always set here or is
1027                          * the race between RX and TX status causing some
1028                          * packets to be filtered out before 80211.o gets an
1029                          * update for PS status? This seems to be the case, so
1030                          * no changes are likely to be needed. */
1031                         if (sta->flags & WLAN_STA_PS &&
1032                             skb_queue_len(&sta->tx_filtered) <
1033                             STA_MAX_TX_BUFFER) {
1034                                 ieee80211_remove_tx_extra(local, sta->key,
1035                                                           skb,
1036                                                           &status->control);
1037                                 skb_queue_tail(&sta->tx_filtered, skb);
1038                         } else if (!(sta->flags & WLAN_STA_PS) &&
1039                                    !(status->control.flags & IEEE80211_TXCTL_REQUEUE)) {
1040                                 /* Software retry the packet once */
1041                                 status->control.flags |= IEEE80211_TXCTL_REQUEUE;
1042                                 ieee80211_remove_tx_extra(local, sta->key,
1043                                                           skb,
1044                                                           &status->control);
1045                                 dev_queue_xmit(skb);
1046                         } else {
1047                                 if (net_ratelimit()) {
1048                                         printk(KERN_DEBUG "%s: dropped TX "
1049                                                "filtered frame queue_len=%d "
1050                                                "PS=%d @%lu\n",
1051                                                local->mdev->name,
1052                                                skb_queue_len(
1053                                                        &sta->tx_filtered),
1054                                                !!(sta->flags & WLAN_STA_PS),
1055                                                jiffies);
1056                                 }
1057                                 dev_kfree_skb(skb);
1058                         }
1059                         sta_info_put(sta);
1060                         return;
1061                 }
1062         } else {
1063                 /* FIXME: STUPID to call this with both local and local->mdev */
1064                 rate_control_tx_status(local, local->mdev, skb, status);
1065         }
1066
1067         ieee80211_led_tx(local, 0);
1068
1069         /* SNMP counters
1070          * Fragments are passed to low-level drivers as separate skbs, so these
1071          * are actually fragments, not frames. Update frame counters only for
1072          * the first fragment of the frame. */
1073
1074         frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG;
1075         type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE;
1076
1077         if (status->flags & IEEE80211_TX_STATUS_ACK) {
1078                 if (frag == 0) {
1079                         local->dot11TransmittedFrameCount++;
1080                         if (is_multicast_ether_addr(hdr->addr1))
1081                                 local->dot11MulticastTransmittedFrameCount++;
1082                         if (status->retry_count > 0)
1083                                 local->dot11RetryCount++;
1084                         if (status->retry_count > 1)
1085                                 local->dot11MultipleRetryCount++;
1086                 }
1087
1088                 /* This counter shall be incremented for an acknowledged MPDU
1089                  * with an individual address in the address 1 field or an MPDU
1090                  * with a multicast address in the address 1 field of type Data
1091                  * or Management. */
1092                 if (!is_multicast_ether_addr(hdr->addr1) ||
1093                     type == IEEE80211_FTYPE_DATA ||
1094                     type == IEEE80211_FTYPE_MGMT)
1095                         local->dot11TransmittedFragmentCount++;
1096         } else {
1097                 if (frag == 0)
1098                         local->dot11FailedCount++;
1099         }
1100
1101         msg_type = (status->flags & IEEE80211_TX_STATUS_ACK) ?
1102                 ieee80211_msg_tx_callback_ack : ieee80211_msg_tx_callback_fail;
1103
1104         /* this was a transmitted frame, but now we want to reuse it */
1105         skb_orphan(skb);
1106
1107         if ((status->control.flags & IEEE80211_TXCTL_REQ_TX_STATUS) &&
1108             local->apdev) {
1109                 if (local->monitors) {
1110                         skb2 = skb_clone(skb, GFP_ATOMIC);
1111                 } else {
1112                         skb2 = skb;
1113                         skb = NULL;
1114                 }
1115
1116                 if (skb2)
1117                         /* Send frame to hostapd */
1118                         ieee80211_rx_mgmt(local, skb2, NULL, msg_type);
1119
1120                 if (!skb)
1121                         return;
1122         }
1123
1124         if (!local->monitors) {
1125                 dev_kfree_skb(skb);
1126                 return;
1127         }
1128
1129         /* send frame to monitor interfaces now */
1130
1131         if (skb_headroom(skb) < sizeof(*rthdr)) {
1132                 printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
1133                 dev_kfree_skb(skb);
1134                 return;
1135         }
1136
1137         rthdr = (struct ieee80211_tx_status_rtap_hdr*)
1138                                 skb_push(skb, sizeof(*rthdr));
1139
1140         memset(rthdr, 0, sizeof(*rthdr));
1141         rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
1142         rthdr->hdr.it_present =
1143                 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
1144                             (1 << IEEE80211_RADIOTAP_DATA_RETRIES));
1145
1146         if (!(status->flags & IEEE80211_TX_STATUS_ACK) &&
1147             !is_multicast_ether_addr(hdr->addr1))
1148                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL);
1149
1150         if ((status->control.flags & IEEE80211_TXCTL_USE_RTS_CTS) &&
1151             (status->control.flags & IEEE80211_TXCTL_USE_CTS_PROTECT))
1152                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS);
1153         else if (status->control.flags & IEEE80211_TXCTL_USE_RTS_CTS)
1154                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS);
1155
1156         rthdr->data_retries = status->retry_count;
1157
1158         read_lock(&local->sub_if_lock);
1159         monitors = local->monitors;
1160         list_for_each_entry(sdata, &local->sub_if_list, list) {
1161                 /*
1162                  * Using the monitors counter is possibly racy, but
1163                  * if the value is wrong we simply either clone the skb
1164                  * once too much or forget sending it to one monitor iface
1165                  * The latter case isn't nice but fixing the race is much
1166                  * more complicated.
1167                  */
1168                 if (!monitors || !skb)
1169                         goto out;
1170
1171                 if (sdata->type == IEEE80211_IF_TYPE_MNTR) {
1172                         if (!netif_running(sdata->dev))
1173                                 continue;
1174                         monitors--;
1175                         if (monitors)
1176                                 skb2 = skb_clone(skb, GFP_KERNEL);
1177                         else
1178                                 skb2 = NULL;
1179                         skb->dev = sdata->dev;
1180                         /* XXX: is this sufficient for BPF? */
1181                         skb_set_mac_header(skb, 0);
1182                         skb->ip_summed = CHECKSUM_UNNECESSARY;
1183                         skb->pkt_type = PACKET_OTHERHOST;
1184                         skb->protocol = htons(ETH_P_802_2);
1185                         memset(skb->cb, 0, sizeof(skb->cb));
1186                         netif_rx(skb);
1187                         skb = skb2;
1188                 }
1189         }
1190  out:
1191         read_unlock(&local->sub_if_lock);
1192         if (skb)
1193                 dev_kfree_skb(skb);
1194 }
1195 EXPORT_SYMBOL(ieee80211_tx_status);
1196
1197 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
1198                                         const struct ieee80211_ops *ops)
1199 {
1200         struct net_device *mdev;
1201         struct ieee80211_local *local;
1202         struct ieee80211_sub_if_data *sdata;
1203         int priv_size;
1204         struct wiphy *wiphy;
1205
1206         /* Ensure 32-byte alignment of our private data and hw private data.
1207          * We use the wiphy priv data for both our ieee80211_local and for
1208          * the driver's private data
1209          *
1210          * In memory it'll be like this:
1211          *
1212          * +-------------------------+
1213          * | struct wiphy           |
1214          * +-------------------------+
1215          * | struct ieee80211_local  |
1216          * +-------------------------+
1217          * | driver's private data   |
1218          * +-------------------------+
1219          *
1220          */
1221         priv_size = ((sizeof(struct ieee80211_local) +
1222                       NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST) +
1223                     priv_data_len;
1224
1225         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
1226
1227         if (!wiphy)
1228                 return NULL;
1229
1230         wiphy->privid = mac80211_wiphy_privid;
1231
1232         local = wiphy_priv(wiphy);
1233         local->hw.wiphy = wiphy;
1234
1235         local->hw.priv = (char *)local +
1236                          ((sizeof(struct ieee80211_local) +
1237                            NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);
1238
1239         BUG_ON(!ops->tx);
1240         BUG_ON(!ops->config);
1241         BUG_ON(!ops->add_interface);
1242         local->ops = ops;
1243
1244         /* for now, mdev needs sub_if_data :/ */
1245         mdev = alloc_netdev(sizeof(struct ieee80211_sub_if_data),
1246                             "wmaster%d", ether_setup);
1247         if (!mdev) {
1248                 wiphy_free(wiphy);
1249                 return NULL;
1250         }
1251
1252         sdata = IEEE80211_DEV_TO_SUB_IF(mdev);
1253         mdev->ieee80211_ptr = &sdata->wdev;
1254         sdata->wdev.wiphy = wiphy;
1255
1256         local->hw.queues = 1; /* default */
1257
1258         local->mdev = mdev;
1259         local->rx_pre_handlers = ieee80211_rx_pre_handlers;
1260         local->rx_handlers = ieee80211_rx_handlers;
1261         local->tx_handlers = ieee80211_tx_handlers;
1262
1263         local->bridge_packets = 1;
1264
1265         local->rts_threshold = IEEE80211_MAX_RTS_THRESHOLD;
1266         local->fragmentation_threshold = IEEE80211_MAX_FRAG_THRESHOLD;
1267         local->short_retry_limit = 7;
1268         local->long_retry_limit = 4;
1269         local->hw.conf.radio_enabled = 1;
1270
1271         local->enabled_modes = (unsigned int) -1;
1272
1273         INIT_LIST_HEAD(&local->modes_list);
1274
1275         rwlock_init(&local->sub_if_lock);
1276         INIT_LIST_HEAD(&local->sub_if_list);
1277
1278         INIT_DELAYED_WORK(&local->scan_work, ieee80211_sta_scan_work);
1279         init_timer(&local->stat_timer);
1280         local->stat_timer.function = ieee80211_stat_refresh;
1281         local->stat_timer.data = (unsigned long) local;
1282         ieee80211_rx_bss_list_init(mdev);
1283
1284         sta_info_init(local);
1285
1286         mdev->hard_start_xmit = ieee80211_master_start_xmit;
1287         mdev->open = ieee80211_master_open;
1288         mdev->stop = ieee80211_master_stop;
1289         mdev->type = ARPHRD_IEEE80211;
1290         mdev->hard_header_parse = header_parse_80211;
1291
1292         sdata->type = IEEE80211_IF_TYPE_AP;
1293         sdata->dev = mdev;
1294         sdata->local = local;
1295         sdata->u.ap.force_unicast_rateidx = -1;
1296         sdata->u.ap.max_ratectrl_rateidx = -1;
1297         ieee80211_if_sdata_init(sdata);
1298         list_add_tail(&sdata->list, &local->sub_if_list);
1299
1300         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
1301                      (unsigned long)local);
1302         tasklet_disable(&local->tx_pending_tasklet);
1303
1304         tasklet_init(&local->tasklet,
1305                      ieee80211_tasklet_handler,
1306                      (unsigned long) local);
1307         tasklet_disable(&local->tasklet);
1308
1309         skb_queue_head_init(&local->skb_queue);
1310         skb_queue_head_init(&local->skb_queue_unreliable);
1311
1312         return local_to_hw(local);
1313 }
1314 EXPORT_SYMBOL(ieee80211_alloc_hw);
1315
1316 int ieee80211_register_hw(struct ieee80211_hw *hw)
1317 {
1318         struct ieee80211_local *local = hw_to_local(hw);
1319         const char *name;
1320         int result;
1321
1322         result = wiphy_register(local->hw.wiphy);
1323         if (result < 0)
1324                 return result;
1325
1326         name = wiphy_dev(local->hw.wiphy)->driver->name;
1327         local->hw.workqueue = create_singlethread_workqueue(name);
1328         if (!local->hw.workqueue) {
1329                 result = -ENOMEM;
1330                 goto fail_workqueue;
1331         }
1332
1333         /*
1334          * The hardware needs headroom for sending the frame,
1335          * and we need some headroom for passing the frame to monitor
1336          * interfaces, but never both at the same time.
1337          */
1338         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
1339                                    sizeof(struct ieee80211_tx_status_rtap_hdr));
1340
1341         debugfs_hw_add(local);
1342
1343         local->hw.conf.beacon_int = 1000;
1344
1345         local->wstats_flags |= local->hw.max_rssi ?
1346                                IW_QUAL_LEVEL_UPDATED : IW_QUAL_LEVEL_INVALID;
1347         local->wstats_flags |= local->hw.max_signal ?
1348                                IW_QUAL_QUAL_UPDATED : IW_QUAL_QUAL_INVALID;
1349         local->wstats_flags |= local->hw.max_noise ?
1350                                IW_QUAL_NOISE_UPDATED : IW_QUAL_NOISE_INVALID;
1351         if (local->hw.max_rssi < 0 || local->hw.max_noise < 0)
1352                 local->wstats_flags |= IW_QUAL_DBM;
1353
1354         result = sta_info_start(local);
1355         if (result < 0)
1356                 goto fail_sta_info;
1357
1358         rtnl_lock();
1359         result = dev_alloc_name(local->mdev, local->mdev->name);
1360         if (result < 0)
1361                 goto fail_dev;
1362
1363         memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1364         SET_NETDEV_DEV(local->mdev, wiphy_dev(local->hw.wiphy));
1365
1366         result = register_netdevice(local->mdev);
1367         if (result < 0)
1368                 goto fail_dev;
1369
1370         ieee80211_debugfs_add_netdev(IEEE80211_DEV_TO_SUB_IF(local->mdev));
1371
1372         result = ieee80211_init_rate_ctrl_alg(local, NULL);
1373         if (result < 0) {
1374                 printk(KERN_DEBUG "%s: Failed to initialize rate control "
1375                        "algorithm\n", local->mdev->name);
1376                 goto fail_rate;
1377         }
1378
1379         result = ieee80211_wep_init(local);
1380
1381         if (result < 0) {
1382                 printk(KERN_DEBUG "%s: Failed to initialize wep\n",
1383                        local->mdev->name);
1384                 goto fail_wep;
1385         }
1386
1387         ieee80211_install_qdisc(local->mdev);
1388
1389         /* add one default STA interface */
1390         result = ieee80211_if_add(local->mdev, "wlan%d", NULL,
1391                                   IEEE80211_IF_TYPE_STA);
1392         if (result)
1393                 printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
1394                        local->mdev->name);
1395
1396         local->reg_state = IEEE80211_DEV_REGISTERED;
1397         rtnl_unlock();
1398
1399         ieee80211_led_init(local);
1400
1401         return 0;
1402
1403 fail_wep:
1404         rate_control_deinitialize(local);
1405 fail_rate:
1406         ieee80211_debugfs_remove_netdev(IEEE80211_DEV_TO_SUB_IF(local->mdev));
1407         unregister_netdevice(local->mdev);
1408 fail_dev:
1409         rtnl_unlock();
1410         sta_info_stop(local);
1411 fail_sta_info:
1412         debugfs_hw_del(local);
1413         destroy_workqueue(local->hw.workqueue);
1414 fail_workqueue:
1415         wiphy_unregister(local->hw.wiphy);
1416         return result;
1417 }
1418 EXPORT_SYMBOL(ieee80211_register_hw);
1419
1420 int ieee80211_register_hwmode(struct ieee80211_hw *hw,
1421                               struct ieee80211_hw_mode *mode)
1422 {
1423         struct ieee80211_local *local = hw_to_local(hw);
1424         struct ieee80211_rate *rate;
1425         int i;
1426
1427         INIT_LIST_HEAD(&mode->list);
1428         list_add_tail(&mode->list, &local->modes_list);
1429
1430         local->hw_modes |= (1 << mode->mode);
1431         for (i = 0; i < mode->num_rates; i++) {
1432                 rate = &(mode->rates[i]);
1433                 rate->rate_inv = CHAN_UTIL_RATE_LCM / rate->rate;
1434         }
1435         ieee80211_prepare_rates(local, mode);
1436
1437         if (!local->oper_hw_mode) {
1438                 /* Default to this mode */
1439                 local->hw.conf.phymode = mode->mode;
1440                 local->oper_hw_mode = local->scan_hw_mode = mode;
1441                 local->oper_channel = local->scan_channel = &mode->channels[0];
1442                 local->hw.conf.mode = local->oper_hw_mode;
1443                 local->hw.conf.chan = local->oper_channel;
1444         }
1445
1446         if (!(hw->flags & IEEE80211_HW_DEFAULT_REG_DOMAIN_CONFIGURED))
1447                 ieee80211_set_default_regdomain(mode);
1448
1449         return 0;
1450 }
1451 EXPORT_SYMBOL(ieee80211_register_hwmode);
1452
1453 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
1454 {
1455         struct ieee80211_local *local = hw_to_local(hw);
1456         struct ieee80211_sub_if_data *sdata, *tmp;
1457         struct list_head tmp_list;
1458         int i;
1459
1460         tasklet_kill(&local->tx_pending_tasklet);
1461         tasklet_kill(&local->tasklet);
1462
1463         rtnl_lock();
1464
1465         BUG_ON(local->reg_state != IEEE80211_DEV_REGISTERED);
1466
1467         local->reg_state = IEEE80211_DEV_UNREGISTERED;
1468         if (local->apdev)
1469                 ieee80211_if_del_mgmt(local);
1470
1471         write_lock_bh(&local->sub_if_lock);
1472         list_replace_init(&local->sub_if_list, &tmp_list);
1473         write_unlock_bh(&local->sub_if_lock);
1474
1475         list_for_each_entry_safe(sdata, tmp, &tmp_list, list)
1476                 __ieee80211_if_del(local, sdata);
1477
1478         rtnl_unlock();
1479
1480         if (local->stat_time)
1481                 del_timer_sync(&local->stat_timer);
1482
1483         ieee80211_rx_bss_list_deinit(local->mdev);
1484         ieee80211_clear_tx_pending(local);
1485         sta_info_stop(local);
1486         rate_control_deinitialize(local);
1487         debugfs_hw_del(local);
1488
1489         for (i = 0; i < NUM_IEEE80211_MODES; i++) {
1490                 kfree(local->supp_rates[i]);
1491                 kfree(local->basic_rates[i]);
1492         }
1493
1494         if (skb_queue_len(&local->skb_queue)
1495                         || skb_queue_len(&local->skb_queue_unreliable))
1496                 printk(KERN_WARNING "%s: skb_queue not empty\n",
1497                        local->mdev->name);
1498         skb_queue_purge(&local->skb_queue);
1499         skb_queue_purge(&local->skb_queue_unreliable);
1500
1501         destroy_workqueue(local->hw.workqueue);
1502         wiphy_unregister(local->hw.wiphy);
1503         ieee80211_wep_free(local);
1504         ieee80211_led_exit(local);
1505 }
1506 EXPORT_SYMBOL(ieee80211_unregister_hw);
1507
1508 void ieee80211_free_hw(struct ieee80211_hw *hw)
1509 {
1510         struct ieee80211_local *local = hw_to_local(hw);
1511
1512         ieee80211_if_free(local->mdev);
1513         wiphy_free(local->hw.wiphy);
1514 }
1515 EXPORT_SYMBOL(ieee80211_free_hw);
1516
1517 struct net_device_stats *ieee80211_dev_stats(struct net_device *dev)
1518 {
1519         struct ieee80211_sub_if_data *sdata;
1520         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1521         return &sdata->stats;
1522 }
1523
1524 static int __init ieee80211_init(void)
1525 {
1526         struct sk_buff *skb;
1527         int ret;
1528
1529         BUILD_BUG_ON(sizeof(struct ieee80211_tx_packet_data) > sizeof(skb->cb));
1530
1531         ret = ieee80211_wme_register();
1532         if (ret) {
1533                 printk(KERN_DEBUG "ieee80211_init: failed to "
1534                        "initialize WME (err=%d)\n", ret);
1535                 return ret;
1536         }
1537
1538         ieee80211_debugfs_netdev_init();
1539         ieee80211_regdomain_init();
1540
1541         return 0;
1542 }
1543
1544 static void __exit ieee80211_exit(void)
1545 {
1546         ieee80211_wme_unregister();
1547         ieee80211_debugfs_netdev_exit();
1548 }
1549
1550
1551 subsys_initcall(ieee80211_init);
1552 module_exit(ieee80211_exit);
1553
1554 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1555 MODULE_LICENSE("GPL");