git.oblomov.eu Git - linux-2.6/blob - net/mac80211/main.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/net_namespace.h>
  25 #include <net/cfg80211.h>
  26
  27 #include "ieee80211_i.h"
  28 #include "rate.h"
  29 #include "mesh.h"
  30 #include "wep.h"
  31 #include "wme.h"
  32 #include "aes_ccm.h"
  33 #include "led.h"
  34 #include "cfg.h"
  35 #include "debugfs.h"
  36 #include "debugfs_netdev.h"
  37
  38 #define SUPP_MCS_SET_LEN 16
  39
  40 /*
  41  * For seeing transmitted packets on monitor interfaces
  42  * we have a radiotap header too.
  43  */
  44 struct ieee80211_tx_status_rtap_hdr {
  45         struct ieee80211_radiotap_header hdr;
  46         __le16 tx_flags;
  47         u8 data_retries;
  48 } __attribute__ ((packed));
  49
  50 /* common interface routines */
  51
  52 static int header_parse_80211(const struct sk_buff *skb, unsigned char *haddr)
  53 {
  54         memcpy(haddr, skb_mac_header(skb) + 10, ETH_ALEN); /* addr2 */
  55         return ETH_ALEN;
  56 }
  57
  58 /* must be called under mdev tx lock */
  59 static void ieee80211_configure_filter(struct ieee80211_local *local)
  60 {
  61         unsigned int changed_flags;
  62         unsigned int new_flags = 0;
  63
  64         if (atomic_read(&local->iff_promiscs))
  65                 new_flags |= FIF_PROMISC_IN_BSS;
  66
  67         if (atomic_read(&local->iff_allmultis))
  68                 new_flags |= FIF_ALLMULTI;
  69
  70         if (local->monitors)
  71                 new_flags |= FIF_BCN_PRBRESP_PROMISC;
  72
  73         if (local->fif_fcsfail)
  74                 new_flags |= FIF_FCSFAIL;
  75
  76         if (local->fif_plcpfail)
  77                 new_flags |= FIF_PLCPFAIL;
  78
  79         if (local->fif_control)
  80                 new_flags |= FIF_CONTROL;
  81
  82         if (local->fif_other_bss)
  83                 new_flags |= FIF_OTHER_BSS;
  84
  85         changed_flags = local->filter_flags ^ new_flags;
  86
  87         /* be a bit nasty */
  88         new_flags |= (1<<31);
  89
  90         local->ops->configure_filter(local_to_hw(local),
  91                                      changed_flags, &new_flags,
  92                                      local->mdev->mc_count,
  93                                      local->mdev->mc_list);
  94
  95         WARN_ON(new_flags & (1<<31));
  96
  97         local->filter_flags = new_flags & ~(1<<31);
  98 }
  99
 100 /* master interface */
 101
 102 static int ieee80211_master_open(struct net_device *dev)
 103 {
 104         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 105         struct ieee80211_sub_if_data *sdata;
 106         int res = -EOPNOTSUPP;
 107
 108         /* we hold the RTNL here so can safely walk the list */
 109         list_for_each_entry(sdata, &local->interfaces, list) {
 110                 if (sdata->dev != dev && netif_running(sdata->dev)) {
 111                         res = 0;
 112                         break;
 113                 }
 114         }
 115         return res;
 116 }
 117
 118 static int ieee80211_master_stop(struct net_device *dev)
 119 {
 120         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 121         struct ieee80211_sub_if_data *sdata;
 122
 123         /* we hold the RTNL here so can safely walk the list */
 124         list_for_each_entry(sdata, &local->interfaces, list)
 125                 if (sdata->dev != dev && netif_running(sdata->dev))
 126                         dev_close(sdata->dev);
 127
 128         return 0;
 129 }
 130
 131 static void ieee80211_master_set_multicast_list(struct net_device *dev)
 132 {
 133         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 134
 135         ieee80211_configure_filter(local);
 136 }
 137
 138 /* regular interfaces */
 139
 140 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
 141 {
 142         int meshhdrlen;
 143         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 144
 145         meshhdrlen = (sdata->vif.type == IEEE80211_IF_TYPE_MESH_POINT) ? 5 : 0;
 146
 147         /* FIX: what would be proper limits for MTU?
 148          * This interface uses 802.3 frames. */
 149         if (new_mtu < 256 ||
 150                 new_mtu > IEEE80211_MAX_DATA_LEN - 24 - 6 - meshhdrlen) {
 151                 printk(KERN_WARNING "%s: invalid MTU %d\n",
 152                        dev->name, new_mtu);
 153                 return -EINVAL;
 154         }
 155
 156 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 157         printk(KERN_DEBUG "%s: setting MTU %d\n", dev->name, new_mtu);
 158 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
 159         dev->mtu = new_mtu;
 160         return 0;
 161 }
 162
 163 static inline int identical_mac_addr_allowed(int type1, int type2)
 164 {
 165         return (type1 == IEEE80211_IF_TYPE_MNTR ||
 166                 type2 == IEEE80211_IF_TYPE_MNTR ||
 167                 (type1 == IEEE80211_IF_TYPE_AP &&
 168                  type2 == IEEE80211_IF_TYPE_WDS) ||
 169                 (type1 == IEEE80211_IF_TYPE_WDS &&
 170                  (type2 == IEEE80211_IF_TYPE_WDS ||
 171                   type2 == IEEE80211_IF_TYPE_AP)) ||
 172                 (type1 == IEEE80211_IF_TYPE_AP &&
 173                  type2 == IEEE80211_IF_TYPE_VLAN) ||
 174                 (type1 == IEEE80211_IF_TYPE_VLAN &&
 175                  (type2 == IEEE80211_IF_TYPE_AP ||
 176                   type2 == IEEE80211_IF_TYPE_VLAN)));
 177 }
 178
 179 static int ieee80211_open(struct net_device *dev)
 180 {
 181         struct ieee80211_sub_if_data *sdata, *nsdata;
 182         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 183         struct ieee80211_if_init_conf conf;
 184         int res;
 185         bool need_hw_reconfig = 0;
 186         struct sta_info *sta;
 187
 188         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 189
 190         /* we hold the RTNL here so can safely walk the list */
 191         list_for_each_entry(nsdata, &local->interfaces, list) {
 192                 struct net_device *ndev = nsdata->dev;
 193
 194                 if (ndev != dev && ndev != local->mdev && netif_running(ndev)) {
 195                         /*
 196                          * Allow only a single IBSS interface to be up at any
 197                          * time. This is restricted because beacon distribution
 198                          * cannot work properly if both are in the same IBSS.
 199                          *
 200                          * To remove this restriction we'd have to disallow them
 201                          * from setting the same SSID on different IBSS interfaces
 202                          * belonging to the same hardware. Then, however, we're
 203                          * faced with having to adopt two different TSF timers...
 204                          */
 205                         if (sdata->vif.type == IEEE80211_IF_TYPE_IBSS &&
 206                             nsdata->vif.type == IEEE80211_IF_TYPE_IBSS)
 207                                 return -EBUSY;
 208
 209                         /*
 210                          * Disallow multiple IBSS/STA mode interfaces.
 211                          *
 212                          * This is a technical restriction, it is possible although
 213                          * most likely not IEEE 802.11 compliant to have multiple
 214                          * STAs with just a single hardware (the TSF timer will not
 215                          * be adjusted properly.)
 216                          *
 217                          * However, because mac80211 uses the master device's BSS
 218                          * information for each STA/IBSS interface, doing this will
 219                          * currently corrupt that BSS information completely, unless,
 220                          * a not very useful case, both STAs are associated to the
 221                          * same BSS.
 222                          *
 223                          * To remove this restriction, the BSS information needs to
 224                          * be embedded in the STA/IBSS mode sdata instead of using
 225                          * the master device's BSS structure.
 226                          */
 227                         if ((sdata->vif.type == IEEE80211_IF_TYPE_STA ||
 228                              sdata->vif.type == IEEE80211_IF_TYPE_IBSS) &&
 229                             (nsdata->vif.type == IEEE80211_IF_TYPE_STA ||
 230                              nsdata->vif.type == IEEE80211_IF_TYPE_IBSS))
 231                                 return -EBUSY;
 232
 233                         /*
 234                          * The remaining checks are only performed for interfaces
 235                          * with the same MAC address.
 236                          */
 237                         if (compare_ether_addr(dev->dev_addr, ndev->dev_addr))
 238                                 continue;
 239
 240                         /*
 241                          * check whether it may have the same address
 242                          */
 243                         if (!identical_mac_addr_allowed(sdata->vif.type,
 244                                                         nsdata->vif.type))
 245                                 return -ENOTUNIQ;
 246
 247                         /*
 248                          * can only add VLANs to enabled APs
 249                          */
 250                         if (sdata->vif.type == IEEE80211_IF_TYPE_VLAN &&
 251                             nsdata->vif.type == IEEE80211_IF_TYPE_AP)
 252                                 sdata->u.vlan.ap = nsdata;
 253                 }
 254         }
 255
 256         switch (sdata->vif.type) {
 257         case IEEE80211_IF_TYPE_WDS:
 258                 if (is_zero_ether_addr(sdata->u.wds.remote_addr))
 259                         return -ENOLINK;
 260
 261                 /* Create STA entry for the WDS peer */
 262                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
 263                                      GFP_KERNEL);
 264                 if (!sta)
 265                         return -ENOMEM;
 266
 267                 sta->flags |= WLAN_STA_AUTHORIZED;
 268
 269                 res = sta_info_insert(sta);
 270                 if (res) {
 271                         /* STA has been freed */
 272                         return res;
 273                 }
 274                 break;
 275         case IEEE80211_IF_TYPE_VLAN:
 276                 if (!sdata->u.vlan.ap)
 277                         return -ENOLINK;
 278                 break;
 279         case IEEE80211_IF_TYPE_AP:
 280         case IEEE80211_IF_TYPE_STA:
 281         case IEEE80211_IF_TYPE_MNTR:
 282         case IEEE80211_IF_TYPE_IBSS:
 283         case IEEE80211_IF_TYPE_MESH_POINT:
 284                 /* no special treatment */
 285                 break;
 286         case IEEE80211_IF_TYPE_INVALID:
 287                 /* cannot happen */
 288                 WARN_ON(1);
 289                 break;
 290         }
 291
 292         if (local->open_count == 0) {
 293                 res = 0;
 294                 if (local->ops->start)
 295                         res = local->ops->start(local_to_hw(local));
 296                 if (res)
 297                         return res;
 298                 need_hw_reconfig = 1;
 299                 ieee80211_led_radio(local, local->hw.conf.radio_enabled);
 300         }
 301
 302         switch (sdata->vif.type) {
 303         case IEEE80211_IF_TYPE_VLAN:
 304                 list_add(&sdata->u.vlan.list, &sdata->u.vlan.ap->u.ap.vlans);
 305                 /* no need to tell driver */
 306                 break;
 307         case IEEE80211_IF_TYPE_MNTR:
 308                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 309                         local->cooked_mntrs++;
 310                         break;
 311                 }
 312
 313                 /* must be before the call to ieee80211_configure_filter */
 314                 local->monitors++;
 315                 if (local->monitors == 1)
 316                         local->hw.conf.flags |= IEEE80211_CONF_RADIOTAP;
 317
 318                 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
 319                         local->fif_fcsfail++;
 320                 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
 321                         local->fif_plcpfail++;
 322                 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL)
 323                         local->fif_control++;
 324                 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
 325                         local->fif_other_bss++;
 326
 327                 netif_tx_lock_bh(local->mdev);
 328                 ieee80211_configure_filter(local);
 329                 netif_tx_unlock_bh(local->mdev);
 330                 break;
 331         case IEEE80211_IF_TYPE_STA:
 332         case IEEE80211_IF_TYPE_IBSS:
 333                 sdata->u.sta.flags &= ~IEEE80211_STA_PREV_BSSID_SET;
 334                 /* fall through */
 335         default:
 336                 conf.vif = &sdata->vif;
 337                 conf.type = sdata->vif.type;
 338                 conf.mac_addr = dev->dev_addr;
 339                 res = local->ops->add_interface(local_to_hw(local), &conf);
 340                 if (res && !local->open_count && local->ops->stop)
 341                         local->ops->stop(local_to_hw(local));
 342                 if (res)
 343                         return res;
 344
 345                 ieee80211_if_config(dev);
 346                 ieee80211_reset_erp_info(dev);
 347                 ieee80211_enable_keys(sdata);
 348
 349                 if (sdata->vif.type == IEEE80211_IF_TYPE_STA &&
 350                     !(sdata->flags & IEEE80211_SDATA_USERSPACE_MLME))
 351                         netif_carrier_off(dev);
 352                 else
 353                         netif_carrier_on(dev);
 354         }
 355
 356         if (local->open_count == 0) {
 357                 res = dev_open(local->mdev);
 358                 WARN_ON(res);
 359                 tasklet_enable(&local->tx_pending_tasklet);
 360                 tasklet_enable(&local->tasklet);
 361         }
 362
 363         /*
 364          * set_multicast_list will be invoked by the networking core
 365          * which will check whether any increments here were done in
 366          * error and sync them down to the hardware as filter flags.
 367          */
 368         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 369                 atomic_inc(&local->iff_allmultis);
 370
 371         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 372                 atomic_inc(&local->iff_promiscs);
 373
 374         local->open_count++;
 375         if (need_hw_reconfig)
 376                 ieee80211_hw_config(local);
 377
 378         /*
 379          * ieee80211_sta_work is disabled while network interface
 380          * is down. Therefore, some configuration changes may not
 381          * yet be effective. Trigger execution of ieee80211_sta_work
 382          * to fix this.
 383          */
 384         if(sdata->vif.type == IEEE80211_IF_TYPE_STA ||
 385            sdata->vif.type == IEEE80211_IF_TYPE_IBSS) {
 386                 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
 387                 queue_work(local->hw.workqueue, &ifsta->work);
 388         }
 389
 390         netif_start_queue(dev);
 391
 392         return 0;
 393 }
 394
 395 static int ieee80211_stop(struct net_device *dev)
 396 {
 397         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 398         struct ieee80211_local *local = sdata->local;
 399         struct ieee80211_if_init_conf conf;
 400         struct sta_info *sta;
 401
 402         /*
 403          * Stop TX on this interface first.
 404          */
 405         netif_stop_queue(dev);
 406
 407         /*
 408          * Now delete all active aggregation sessions.
 409          */
 410         rcu_read_lock();
 411
 412         list_for_each_entry_rcu(sta, &local->sta_list, list) {
 413                 if (sta->sdata == sdata)
 414                         ieee80211_sta_tear_down_BA_sessions(dev, sta->addr);
 415         }
 416
 417         rcu_read_unlock();
 418
 419         /*
 420          * Remove all stations associated with this interface.
 421          *
 422          * This must be done before calling ops->remove_interface()
 423          * because otherwise we can later invoke ops->sta_notify()
 424          * whenever the STAs are removed, and that invalidates driver
 425          * assumptions about always getting a vif pointer that is valid
 426          * (because if we remove a STA after ops->remove_interface()
 427          * the driver will have removed the vif info already!)
 428          *
 429          * We could relax this and only unlink the stations from the
 430          * hash table and list but keep them on a per-sdata list that
 431          * will be inserted back again when the interface is brought
 432          * up again, but I don't currently see a use case for that,
 433          * except with WDS which gets a STA entry created when it is
 434          * brought up.
 435          */
 436         sta_info_flush(local, sdata);
 437
 438         /*
 439          * Don't count this interface for promisc/allmulti while it
 440          * is down. dev_mc_unsync() will invoke set_multicast_list
 441          * on the master interface which will sync these down to the
 442          * hardware as filter flags.
 443          */
 444         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 445                 atomic_dec(&local->iff_allmultis);
 446
 447         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 448                 atomic_dec(&local->iff_promiscs);
 449
 450         dev_mc_unsync(local->mdev, dev);
 451
 452         /* APs need special treatment */
 453         if (sdata->vif.type == IEEE80211_IF_TYPE_AP) {
 454                 struct ieee80211_sub_if_data *vlan, *tmp;
 455                 struct beacon_data *old_beacon = sdata->u.ap.beacon;
 456
 457                 /* remove beacon */
 458                 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
 459                 synchronize_rcu();
 460                 kfree(old_beacon);
 461
 462                 /* down all dependent devices, that is VLANs */
 463                 list_for_each_entry_safe(vlan, tmp, &sdata->u.ap.vlans,
 464                                          u.vlan.list)
 465                         dev_close(vlan->dev);
 466                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
 467         }
 468
 469         local->open_count--;
 470
 471         switch (sdata->vif.type) {
 472         case IEEE80211_IF_TYPE_VLAN:
 473                 list_del(&sdata->u.vlan.list);
 474                 sdata->u.vlan.ap = NULL;
 475                 /* no need to tell driver */
 476                 break;
 477         case IEEE80211_IF_TYPE_MNTR:
 478                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 479                         local->cooked_mntrs--;
 480                         break;
 481                 }
 482
 483                 local->monitors--;
 484                 if (local->monitors == 0)
 485                         local->hw.conf.flags &= ~IEEE80211_CONF_RADIOTAP;
 486
 487                 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
 488                         local->fif_fcsfail--;
 489                 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
 490                         local->fif_plcpfail--;
 491                 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL)
 492                         local->fif_control--;
 493                 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
 494                         local->fif_other_bss--;
 495
 496                 netif_tx_lock_bh(local->mdev);
 497                 ieee80211_configure_filter(local);
 498                 netif_tx_unlock_bh(local->mdev);
 499                 break;
 500         case IEEE80211_IF_TYPE_MESH_POINT:
 501         case IEEE80211_IF_TYPE_STA:
 502         case IEEE80211_IF_TYPE_IBSS:
 503                 sdata->u.sta.state = IEEE80211_DISABLED;
 504                 del_timer_sync(&sdata->u.sta.timer);
 505                 /*
 506                  * When we get here, the interface is marked down.
 507                  * Call synchronize_rcu() to wait for the RX path
 508                  * should it be using the interface and enqueuing
 509                  * frames at this very time on another CPU.
 510                  */
 511                 synchronize_rcu();
 512                 skb_queue_purge(&sdata->u.sta.skb_queue);
 513
 514                 if (local->scan_dev == sdata->dev) {
 515                         if (!local->ops->hw_scan) {
 516                                 local->sta_sw_scanning = 0;
 517                                 cancel_delayed_work(&local->scan_work);
 518                         } else
 519                                 local->sta_hw_scanning = 0;
 520                 }
 521
 522                 flush_workqueue(local->hw.workqueue);
 523
 524                 sdata->u.sta.flags &= ~IEEE80211_STA_PRIVACY_INVOKED;
 525                 kfree(sdata->u.sta.extra_ie);
 526                 sdata->u.sta.extra_ie = NULL;
 527                 sdata->u.sta.extra_ie_len = 0;
 528                 /* fall through */
 529         default:
 530                 conf.vif = &sdata->vif;
 531                 conf.type = sdata->vif.type;
 532                 conf.mac_addr = dev->dev_addr;
 533                 /* disable all keys for as long as this netdev is down */
 534                 ieee80211_disable_keys(sdata);
 535                 local->ops->remove_interface(local_to_hw(local), &conf);
 536         }
 537
 538         if (local->open_count == 0) {
 539                 if (netif_running(local->mdev))
 540                         dev_close(local->mdev);
 541
 542                 if (local->ops->stop)
 543                         local->ops->stop(local_to_hw(local));
 544
 545                 ieee80211_led_radio(local, 0);
 546
 547                 tasklet_disable(&local->tx_pending_tasklet);
 548                 tasklet_disable(&local->tasklet);
 549         }
 550
 551         return 0;
 552 }
 553
 554 int ieee80211_start_tx_ba_session(struct ieee80211_hw *hw, u8 *ra, u16 tid)
 555 {
 556         struct ieee80211_local *local = hw_to_local(hw);
 557         struct sta_info *sta;
 558         struct ieee80211_sub_if_data *sdata;
 559         u16 start_seq_num = 0;
 560         u8 *state;
 561         int ret;
 562         DECLARE_MAC_BUF(mac);
 563
 564         if (tid >= STA_TID_NUM)
 565                 return -EINVAL;
 566
 567 #ifdef CONFIG_MAC80211_HT_DEBUG
 568         printk(KERN_DEBUG "Open BA session requested for %s tid %u\n",
 569                                 print_mac(mac, ra), tid);
 570 #endif /* CONFIG_MAC80211_HT_DEBUG */
 571
 572         rcu_read_lock();
 573
 574         sta = sta_info_get(local, ra);
 575         if (!sta) {
 576                 printk(KERN_DEBUG "Could not find the station\n");
 577                 rcu_read_unlock();
 578                 return -ENOENT;
 579         }
 580
 581         spin_lock_bh(&sta->ampdu_mlme.ampdu_tx);
 582
 583         /* we have tried too many times, receiver does not want A-MPDU */
 584         if (sta->ampdu_mlme.addba_req_num[tid] > HT_AGG_MAX_RETRIES) {
 585                 ret = -EBUSY;
 586                 goto start_ba_exit;
 587         }
 588
 589         state = &sta->ampdu_mlme.tid_state_tx[tid];
 590         /* check if the TID is not in aggregation flow already */
 591         if (*state != HT_AGG_STATE_IDLE) {
 592 #ifdef CONFIG_MAC80211_HT_DEBUG
 593                 printk(KERN_DEBUG "BA request denied - session is not "
 594                                  "idle on tid %u\n", tid);
 595 #endif /* CONFIG_MAC80211_HT_DEBUG */
 596                 ret = -EAGAIN;
 597                 goto start_ba_exit;
 598         }
 599
 600         /* prepare A-MPDU MLME for Tx aggregation */
 601         sta->ampdu_mlme.tid_tx[tid] =
 602                         kmalloc(sizeof(struct tid_ampdu_tx), GFP_ATOMIC);
 603         if (!sta->ampdu_mlme.tid_tx[tid]) {
 604                 if (net_ratelimit())
 605                         printk(KERN_ERR "allocate tx mlme to tid %d failed\n",
 606                                         tid);
 607                 ret = -ENOMEM;
 608                 goto start_ba_exit;
 609         }
 610         /* Tx timer */
 611         sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.function =
 612                         sta_addba_resp_timer_expired;
 613         sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.data =
 614                         (unsigned long)&sta->timer_to_tid[tid];
 615         init_timer(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer);
 616
 617         /* ensure that TX flow won't interrupt us
 618          * until the end of the call to requeue function */
 619         spin_lock_bh(&local->mdev->queue_lock);
 620
 621         /* create a new queue for this aggregation */
 622         ret = ieee80211_ht_agg_queue_add(local, sta, tid);
 623
 624         /* case no queue is available to aggregation
 625          * don't switch to aggregation */
 626         if (ret) {
 627 #ifdef CONFIG_MAC80211_HT_DEBUG
 628                 printk(KERN_DEBUG "BA request denied - queue unavailable for"
 629                                         " tid %d\n", tid);
 630 #endif /* CONFIG_MAC80211_HT_DEBUG */
 631                 goto start_ba_err;
 632         }
 633         sdata = sta->sdata;
 634
 635         /* Ok, the Addba frame hasn't been sent yet, but if the driver calls the
 636          * call back right away, it must see that the flow has begun */
 637         *state |= HT_ADDBA_REQUESTED_MSK;
 638
 639         if (local->ops->ampdu_action)
 640                 ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_TX_START,
 641                                                 ra, tid, &start_seq_num);
 642
 643         if (ret) {
 644                 /* No need to requeue the packets in the agg queue, since we
 645                  * held the tx lock: no packet could be enqueued to the newly
 646                  * allocated queue */
 647                  ieee80211_ht_agg_queue_remove(local, sta, tid, 0);
 648 #ifdef CONFIG_MAC80211_HT_DEBUG
 649                 printk(KERN_DEBUG "BA request denied - HW unavailable for"
 650                                         " tid %d\n", tid);
 651 #endif /* CONFIG_MAC80211_HT_DEBUG */
 652                 *state = HT_AGG_STATE_IDLE;
 653                 goto start_ba_err;
 654         }
 655
 656         /* Will put all the packets in the new SW queue */
 657         ieee80211_requeue(local, ieee802_1d_to_ac[tid]);
 658         spin_unlock_bh(&local->mdev->queue_lock);
 659
 660         /* send an addBA request */
 661         sta->ampdu_mlme.dialog_token_allocator++;
 662         sta->ampdu_mlme.tid_tx[tid]->dialog_token =
 663                         sta->ampdu_mlme.dialog_token_allocator;
 664         sta->ampdu_mlme.tid_tx[tid]->ssn = start_seq_num;
 665
 666         ieee80211_send_addba_request(sta->sdata->dev, ra, tid,
 667                          sta->ampdu_mlme.tid_tx[tid]->dialog_token,
 668                          sta->ampdu_mlme.tid_tx[tid]->ssn,
 669                          0x40, 5000);
 670
 671         /* activate the timer for the recipient's addBA response */
 672         sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.expires =
 673                                 jiffies + ADDBA_RESP_INTERVAL;
 674         add_timer(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer);
 675         printk(KERN_DEBUG "activated addBA response timer on tid %d\n", tid);
 676         goto start_ba_exit;
 677
 678 start_ba_err:
 679         kfree(sta->ampdu_mlme.tid_tx[tid]);
 680         sta->ampdu_mlme.tid_tx[tid] = NULL;
 681         spin_unlock_bh(&local->mdev->queue_lock);
 682         ret = -EBUSY;
 683 start_ba_exit:
 684         spin_unlock_bh(&sta->ampdu_mlme.ampdu_tx);
 685         rcu_read_unlock();
 686         return ret;
 687 }
 688 EXPORT_SYMBOL(ieee80211_start_tx_ba_session);
 689
 690 int ieee80211_stop_tx_ba_session(struct ieee80211_hw *hw,
 691                                  u8 *ra, u16 tid,
 692                                  enum ieee80211_back_parties initiator)
 693 {
 694         struct ieee80211_local *local = hw_to_local(hw);
 695         struct sta_info *sta;
 696         u8 *state;
 697         int ret = 0;
 698         DECLARE_MAC_BUF(mac);
 699
 700         if (tid >= STA_TID_NUM)
 701                 return -EINVAL;
 702
 703         rcu_read_lock();
 704         sta = sta_info_get(local, ra);
 705         if (!sta) {
 706                 rcu_read_unlock();
 707                 return -ENOENT;
 708         }
 709
 710         /* check if the TID is in aggregation */
 711         state = &sta->ampdu_mlme.tid_state_tx[tid];
 712         spin_lock_bh(&sta->ampdu_mlme.ampdu_tx);
 713
 714         if (*state != HT_AGG_STATE_OPERATIONAL) {
 715                 ret = -ENOENT;
 716                 goto stop_BA_exit;
 717         }
 718
 719 #ifdef CONFIG_MAC80211_HT_DEBUG
 720         printk(KERN_DEBUG "Tx BA session stop requested for %s tid %u\n",
 721                                 print_mac(mac, ra), tid);
 722 #endif /* CONFIG_MAC80211_HT_DEBUG */
 723
 724         ieee80211_stop_queue(hw, sta->tid_to_tx_q[tid]);
 725
 726         *state = HT_AGG_STATE_REQ_STOP_BA_MSK |
 727                 (initiator << HT_AGG_STATE_INITIATOR_SHIFT);
 728
 729         if (local->ops->ampdu_action)
 730                 ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_TX_STOP,
 731                                                 ra, tid, NULL);
 732
 733         /* case HW denied going back to legacy */
 734         if (ret) {
 735                 WARN_ON(ret != -EBUSY);
 736                 *state = HT_AGG_STATE_OPERATIONAL;
 737                 ieee80211_wake_queue(hw, sta->tid_to_tx_q[tid]);
 738                 goto stop_BA_exit;
 739         }
 740
 741 stop_BA_exit:
 742         spin_unlock_bh(&sta->ampdu_mlme.ampdu_tx);
 743         rcu_read_unlock();
 744         return ret;
 745 }
 746 EXPORT_SYMBOL(ieee80211_stop_tx_ba_session);
 747
 748 void ieee80211_start_tx_ba_cb(struct ieee80211_hw *hw, u8 *ra, u16 tid)
 749 {
 750         struct ieee80211_local *local = hw_to_local(hw);
 751         struct sta_info *sta;
 752         u8 *state;
 753         DECLARE_MAC_BUF(mac);
 754
 755         if (tid >= STA_TID_NUM) {
 756                 printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n",
 757                                 tid, STA_TID_NUM);
 758                 return;
 759         }
 760
 761         rcu_read_lock();
 762         sta = sta_info_get(local, ra);
 763         if (!sta) {
 764                 rcu_read_unlock();
 765                 printk(KERN_DEBUG "Could not find station: %s\n",
 766                                 print_mac(mac, ra));
 767                 return;
 768         }
 769
 770         state = &sta->ampdu_mlme.tid_state_tx[tid];
 771         spin_lock_bh(&sta->ampdu_mlme.ampdu_tx);
 772
 773         if (!(*state & HT_ADDBA_REQUESTED_MSK)) {
 774                 printk(KERN_DEBUG "addBA was not requested yet, state is %d\n",
 775                                 *state);
 776                 spin_unlock_bh(&sta->ampdu_mlme.ampdu_tx);
 777                 rcu_read_unlock();
 778                 return;
 779         }
 780
 781         WARN_ON_ONCE(*state & HT_ADDBA_DRV_READY_MSK);
 782
 783         *state |= HT_ADDBA_DRV_READY_MSK;
 784
 785         if (*state == HT_AGG_STATE_OPERATIONAL) {
 786                 printk(KERN_DEBUG "Aggregation is on for tid %d \n", tid);
 787                 ieee80211_wake_queue(hw, sta->tid_to_tx_q[tid]);
 788         }
 789         spin_unlock_bh(&sta->ampdu_mlme.ampdu_tx);
 790         rcu_read_unlock();
 791 }
 792 EXPORT_SYMBOL(ieee80211_start_tx_ba_cb);
 793
 794 void ieee80211_stop_tx_ba_cb(struct ieee80211_hw *hw, u8 *ra, u8 tid)
 795 {
 796         struct ieee80211_local *local = hw_to_local(hw);
 797         struct sta_info *sta;
 798         u8 *state;
 799         int agg_queue;
 800         DECLARE_MAC_BUF(mac);
 801
 802         if (tid >= STA_TID_NUM) {
 803                 printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n",
 804                                 tid, STA_TID_NUM);
 805                 return;
 806         }
 807
 808 #ifdef CONFIG_MAC80211_HT_DEBUG
 809         printk(KERN_DEBUG "Stopping Tx BA session for %s tid %d\n",
 810                                 print_mac(mac, ra), tid);
 811 #endif /* CONFIG_MAC80211_HT_DEBUG */
 812
 813         rcu_read_lock();
 814         sta = sta_info_get(local, ra);
 815         if (!sta) {
 816                 printk(KERN_DEBUG "Could not find station: %s\n",
 817                                 print_mac(mac, ra));
 818                 rcu_read_unlock();
 819                 return;
 820         }
 821         state = &sta->ampdu_mlme.tid_state_tx[tid];
 822
 823         spin_lock_bh(&sta->ampdu_mlme.ampdu_tx);
 824         if ((*state & HT_AGG_STATE_REQ_STOP_BA_MSK) == 0) {
 825                 printk(KERN_DEBUG "unexpected callback to A-MPDU stop\n");
 826                 spin_unlock_bh(&sta->ampdu_mlme.ampdu_tx);
 827                 rcu_read_unlock();
 828                 return;
 829         }
 830
 831         if (*state & HT_AGG_STATE_INITIATOR_MSK)
 832                 ieee80211_send_delba(sta->sdata->dev, ra, tid,
 833                         WLAN_BACK_INITIATOR, WLAN_REASON_QSTA_NOT_USE);
 834
 835         agg_queue = sta->tid_to_tx_q[tid];
 836
 837         /* avoid ordering issues: we are the only one that can modify
 838          * the content of the qdiscs */
 839         spin_lock_bh(&local->mdev->queue_lock);
 840         /* remove the queue for this aggregation */
 841         ieee80211_ht_agg_queue_remove(local, sta, tid, 1);
 842         spin_unlock_bh(&local->mdev->queue_lock);
 843
 844         /* we just requeued the all the frames that were in the removed
 845          * queue, and since we might miss a softirq we do netif_schedule.
 846          * ieee80211_wake_queue is not used here as this queue is not
 847          * necessarily stopped */
 848         netif_schedule(local->mdev);
 849         *state = HT_AGG_STATE_IDLE;
 850         sta->ampdu_mlme.addba_req_num[tid] = 0;
 851         kfree(sta->ampdu_mlme.tid_tx[tid]);
 852         sta->ampdu_mlme.tid_tx[tid] = NULL;
 853         spin_unlock_bh(&sta->ampdu_mlme.ampdu_tx);
 854
 855         rcu_read_unlock();
 856 }
 857 EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb);
 858
 859 void ieee80211_start_tx_ba_cb_irqsafe(struct ieee80211_hw *hw,
 860                                       const u8 *ra, u16 tid)
 861 {
 862         struct ieee80211_local *local = hw_to_local(hw);
 863         struct ieee80211_ra_tid *ra_tid;
 864         struct sk_buff *skb = dev_alloc_skb(0);
 865
 866         if (unlikely(!skb)) {
 867                 if (net_ratelimit())
 868                         printk(KERN_WARNING "%s: Not enough memory, "
 869                                "dropping start BA session", skb->dev->name);
 870                 return;
 871         }
 872         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
 873         memcpy(&ra_tid->ra, ra, ETH_ALEN);
 874         ra_tid->tid = tid;
 875
 876         skb->pkt_type = IEEE80211_ADDBA_MSG;
 877         skb_queue_tail(&local->skb_queue, skb);
 878         tasklet_schedule(&local->tasklet);
 879 }
 880 EXPORT_SYMBOL(ieee80211_start_tx_ba_cb_irqsafe);
 881
 882 void ieee80211_stop_tx_ba_cb_irqsafe(struct ieee80211_hw *hw,
 883                                      const u8 *ra, u16 tid)
 884 {
 885         struct ieee80211_local *local = hw_to_local(hw);
 886         struct ieee80211_ra_tid *ra_tid;
 887         struct sk_buff *skb = dev_alloc_skb(0);
 888
 889         if (unlikely(!skb)) {
 890                 if (net_ratelimit())
 891                         printk(KERN_WARNING "%s: Not enough memory, "
 892                                "dropping stop BA session", skb->dev->name);
 893                 return;
 894         }
 895         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
 896         memcpy(&ra_tid->ra, ra, ETH_ALEN);
 897         ra_tid->tid = tid;
 898
 899         skb->pkt_type = IEEE80211_DELBA_MSG;
 900         skb_queue_tail(&local->skb_queue, skb);
 901         tasklet_schedule(&local->tasklet);
 902 }
 903 EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb_irqsafe);
 904
 905 static void ieee80211_set_multicast_list(struct net_device *dev)
 906 {
 907         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 908         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 909         int allmulti, promisc, sdata_allmulti, sdata_promisc;
 910
 911         allmulti = !!(dev->flags & IFF_ALLMULTI);
 912         promisc = !!(dev->flags & IFF_PROMISC);
 913         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
 914         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
 915
 916         if (allmulti != sdata_allmulti) {
 917                 if (dev->flags & IFF_ALLMULTI)
 918                         atomic_inc(&local->iff_allmultis);
 919                 else
 920                         atomic_dec(&local->iff_allmultis);
 921                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
 922         }
 923
 924         if (promisc != sdata_promisc) {
 925                 if (dev->flags & IFF_PROMISC)
 926                         atomic_inc(&local->iff_promiscs);
 927                 else
 928                         atomic_dec(&local->iff_promiscs);
 929                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
 930         }
 931
 932         dev_mc_sync(local->mdev, dev);
 933 }
 934
 935 static const struct header_ops ieee80211_header_ops = {
 936         .create         = eth_header,
 937         .parse          = header_parse_80211,
 938         .rebuild        = eth_rebuild_header,
 939         .cache          = eth_header_cache,
 940         .cache_update   = eth_header_cache_update,
 941 };
 942
 943 /* Must not be called for mdev */
 944 void ieee80211_if_setup(struct net_device *dev)
 945 {
 946         ether_setup(dev);
 947         dev->hard_start_xmit = ieee80211_subif_start_xmit;
 948         dev->wireless_handlers = &ieee80211_iw_handler_def;
 949         dev->set_multicast_list = ieee80211_set_multicast_list;
 950         dev->change_mtu = ieee80211_change_mtu;
 951         dev->open = ieee80211_open;
 952         dev->stop = ieee80211_stop;
 953         dev->destructor = ieee80211_if_free;
 954 }
 955
 956 /* everything else */
 957
 958 static int __ieee80211_if_config(struct net_device *dev,
 959                                  struct sk_buff *beacon,
 960                                  struct ieee80211_tx_control *control)
 961 {
 962         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 963         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 964         struct ieee80211_if_conf conf;
 965
 966         if (!local->ops->config_interface || !netif_running(dev))
 967                 return 0;
 968
 969         memset(&conf, 0, sizeof(conf));
 970         conf.type = sdata->vif.type;
 971         if (sdata->vif.type == IEEE80211_IF_TYPE_STA ||
 972             sdata->vif.type == IEEE80211_IF_TYPE_IBSS) {
 973                 conf.bssid = sdata->u.sta.bssid;
 974                 conf.ssid = sdata->u.sta.ssid;
 975                 conf.ssid_len = sdata->u.sta.ssid_len;
 976         } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
 977                 conf.beacon = beacon;
 978                 ieee80211_start_mesh(dev);
 979         } else if (sdata->vif.type == IEEE80211_IF_TYPE_AP) {
 980                 conf.ssid = sdata->u.ap.ssid;
 981                 conf.ssid_len = sdata->u.ap.ssid_len;
 982                 conf.beacon = beacon;
 983                 conf.beacon_control = control;
 984         }
 985         return local->ops->config_interface(local_to_hw(local),
 986                                             &sdata->vif, &conf);
 987 }
 988
 989 int ieee80211_if_config(struct net_device *dev)
 990 {
 991         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 992         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 993         if (sdata->vif.type == IEEE80211_IF_TYPE_MESH_POINT &&
 994             (local->hw.flags & IEEE80211_HW_HOST_GEN_BEACON_TEMPLATE))
 995                 return ieee80211_if_config_beacon(dev);
 996         return __ieee80211_if_config(dev, NULL, NULL);
 997 }
 998
 999 int ieee80211_if_config_beacon(struct net_device *dev)
1000 {
1001         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1002         struct ieee80211_tx_control control;
1003         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1004         struct sk_buff *skb;
1005
1006         if (!(local->hw.flags & IEEE80211_HW_HOST_GEN_BEACON_TEMPLATE))
1007                 return 0;
1008         skb = ieee80211_beacon_get(local_to_hw(local), &sdata->vif,
1009                                    &control);
1010         if (!skb)
1011                 return -ENOMEM;
1012         return __ieee80211_if_config(dev, skb, &control);
1013 }
1014
1015 int ieee80211_hw_config(struct ieee80211_local *local)
1016 {
1017         struct ieee80211_channel *chan;
1018         int ret = 0;
1019
1020         if (local->sta_sw_scanning)
1021                 chan = local->scan_channel;
1022         else
1023                 chan = local->oper_channel;
1024
1025         local->hw.conf.channel = chan;
1026
1027         if (!local->hw.conf.power_level)
1028                 local->hw.conf.power_level = chan->max_power;
1029         else
1030                 local->hw.conf.power_level = min(chan->max_power,
1031                                                local->hw.conf.power_level);
1032
1033         local->hw.conf.max_antenna_gain = chan->max_antenna_gain;
1034
1035 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1036         printk(KERN_DEBUG "%s: HW CONFIG: freq=%d\n",
1037                wiphy_name(local->hw.wiphy), chan->center_freq);
1038 #endif
1039
1040         if (local->open_count)
1041                 ret = local->ops->config(local_to_hw(local), &local->hw.conf);
1042
1043         return ret;
1044 }
1045
1046 /**
1047  * ieee80211_handle_ht should be used only after legacy configuration
1048  * has been determined namely band, as ht configuration depends upon
1049  * the hardware's HT abilities for a _specific_ band.
1050  */
1051 u32 ieee80211_handle_ht(struct ieee80211_local *local, int enable_ht,
1052                            struct ieee80211_ht_info *req_ht_cap,
1053                            struct ieee80211_ht_bss_info *req_bss_cap)
1054 {
1055         struct ieee80211_conf *conf = &local->hw.conf;
1056         struct ieee80211_supported_band *sband;
1057         struct ieee80211_ht_info ht_conf;
1058         struct ieee80211_ht_bss_info ht_bss_conf;
1059         int i;
1060         u32 changed = 0;
1061
1062         sband = local->hw.wiphy->bands[conf->channel->band];
1063
1064         /* HT is not supported */
1065         if (!sband->ht_info.ht_supported) {
1066                 conf->flags &= ~IEEE80211_CONF_SUPPORT_HT_MODE;
1067                 return 0;
1068         }
1069
1070         memset(&ht_conf, 0, sizeof(struct ieee80211_ht_info));
1071         memset(&ht_bss_conf, 0, sizeof(struct ieee80211_ht_bss_info));
1072
1073         if (enable_ht) {
1074                 if (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE))
1075                         changed |= BSS_CHANGED_HT;
1076
1077                 conf->flags |= IEEE80211_CONF_SUPPORT_HT_MODE;
1078                 ht_conf.ht_supported = 1;
1079
1080                 ht_conf.cap = req_ht_cap->cap & sband->ht_info.cap;
1081                 ht_conf.cap &= ~(IEEE80211_HT_CAP_MIMO_PS);
1082                 ht_conf.cap |= sband->ht_info.cap & IEEE80211_HT_CAP_MIMO_PS;
1083
1084                 for (i = 0; i < SUPP_MCS_SET_LEN; i++)
1085                         ht_conf.supp_mcs_set[i] =
1086                                         sband->ht_info.supp_mcs_set[i] &
1087                                         req_ht_cap->supp_mcs_set[i];
1088
1089                 ht_bss_conf.primary_channel = req_bss_cap->primary_channel;
1090                 ht_bss_conf.bss_cap = req_bss_cap->bss_cap;
1091                 ht_bss_conf.bss_op_mode = req_bss_cap->bss_op_mode;
1092
1093                 ht_conf.ampdu_factor = req_ht_cap->ampdu_factor;
1094                 ht_conf.ampdu_density = req_ht_cap->ampdu_density;
1095
1096                 /* if bss configuration changed store the new one */
1097                 if (memcmp(&conf->ht_conf, &ht_conf, sizeof(ht_conf)) ||
1098                     memcmp(&conf->ht_bss_conf, &ht_bss_conf, sizeof(ht_bss_conf))) {
1099                         changed |= BSS_CHANGED_HT;
1100                         memcpy(&conf->ht_conf, &ht_conf, sizeof(ht_conf));
1101                         memcpy(&conf->ht_bss_conf, &ht_bss_conf, sizeof(ht_bss_conf));
1102                 }
1103         } else {
1104                 if (conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE)
1105                         changed |= BSS_CHANGED_HT;
1106                 conf->flags &= ~IEEE80211_CONF_SUPPORT_HT_MODE;
1107         }
1108
1109         return changed;
1110 }
1111
1112 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
1113                                       u32 changed)
1114 {
1115         struct ieee80211_local *local = sdata->local;
1116
1117         if (!changed)
1118                 return;
1119
1120         if (local->ops->bss_info_changed)
1121                 local->ops->bss_info_changed(local_to_hw(local),
1122                                              &sdata->vif,
1123                                              &sdata->bss_conf,
1124                                              changed);
1125 }
1126
1127 void ieee80211_reset_erp_info(struct net_device *dev)
1128 {
1129         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1130
1131         sdata->bss_conf.use_cts_prot = 0;
1132         sdata->bss_conf.use_short_preamble = 0;
1133         ieee80211_bss_info_change_notify(sdata,
1134                                          BSS_CHANGED_ERP_CTS_PROT |
1135                                          BSS_CHANGED_ERP_PREAMBLE);
1136 }
1137
1138 void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
1139                                  struct sk_buff *skb,
1140                                  struct ieee80211_tx_status *status)
1141 {
1142         struct ieee80211_local *local = hw_to_local(hw);
1143         struct ieee80211_tx_status *saved;
1144         int tmp;
1145
1146         skb->dev = local->mdev;
1147         saved = kmalloc(sizeof(struct ieee80211_tx_status), GFP_ATOMIC);
1148         if (unlikely(!saved)) {
1149                 if (net_ratelimit())
1150                         printk(KERN_WARNING "%s: Not enough memory, "
1151                                "dropping tx status", skb->dev->name);
1152                 /* should be dev_kfree_skb_irq, but due to this function being
1153                  * named _irqsafe instead of just _irq we can't be sure that
1154                  * people won't call it from non-irq contexts */
1155                 dev_kfree_skb_any(skb);
1156                 return;
1157         }
1158         memcpy(saved, status, sizeof(struct ieee80211_tx_status));
1159         /* copy pointer to saved status into skb->cb for use by tasklet */
1160         memcpy(skb->cb, &saved, sizeof(saved));
1161
1162         skb->pkt_type = IEEE80211_TX_STATUS_MSG;
1163         skb_queue_tail(status->control.flags & IEEE80211_TXCTL_REQ_TX_STATUS ?
1164                        &local->skb_queue : &local->skb_queue_unreliable, skb);
1165         tmp = skb_queue_len(&local->skb_queue) +
1166                 skb_queue_len(&local->skb_queue_unreliable);
1167         while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
1168                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
1169                 memcpy(&saved, skb->cb, sizeof(saved));
1170                 kfree(saved);
1171                 dev_kfree_skb_irq(skb);
1172                 tmp--;
1173                 I802_DEBUG_INC(local->tx_status_drop);
1174         }
1175         tasklet_schedule(&local->tasklet);
1176 }
1177 EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
1178
1179 static void ieee80211_tasklet_handler(unsigned long data)
1180 {
1181         struct ieee80211_local *local = (struct ieee80211_local *) data;
1182         struct sk_buff *skb;
1183         struct ieee80211_rx_status rx_status;
1184         struct ieee80211_tx_status *tx_status;
1185         struct ieee80211_ra_tid *ra_tid;
1186
1187         while ((skb = skb_dequeue(&local->skb_queue)) ||
1188                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
1189                 switch (skb->pkt_type) {
1190                 case IEEE80211_RX_MSG:
1191                         /* status is in skb->cb */
1192                         memcpy(&rx_status, skb->cb, sizeof(rx_status));
1193                         /* Clear skb->pkt_type in order to not confuse kernel
1194                          * netstack. */
1195                         skb->pkt_type = 0;
1196                         __ieee80211_rx(local_to_hw(local), skb, &rx_status);
1197                         break;
1198                 case IEEE80211_TX_STATUS_MSG:
1199                         /* get pointer to saved status out of skb->cb */
1200                         memcpy(&tx_status, skb->cb, sizeof(tx_status));
1201                         skb->pkt_type = 0;
1202                         ieee80211_tx_status(local_to_hw(local),
1203                                             skb, tx_status);
1204                         kfree(tx_status);
1205                         break;
1206                 case IEEE80211_DELBA_MSG:
1207                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
1208                         ieee80211_stop_tx_ba_cb(local_to_hw(local),
1209                                                 ra_tid->ra, ra_tid->tid);
1210                         dev_kfree_skb(skb);
1211                         break;
1212                 case IEEE80211_ADDBA_MSG:
1213                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
1214                         ieee80211_start_tx_ba_cb(local_to_hw(local),
1215                                                  ra_tid->ra, ra_tid->tid);
1216                         dev_kfree_skb(skb);
1217                         break ;
1218                 default: /* should never get here! */
1219                         printk(KERN_ERR "%s: Unknown message type (%d)\n",
1220                                wiphy_name(local->hw.wiphy), skb->pkt_type);
1221                         dev_kfree_skb(skb);
1222                         break;
1223                 }
1224         }
1225 }
1226
1227 /* Remove added headers (e.g., QoS control), encryption header/MIC, etc. to
1228  * make a prepared TX frame (one that has been given to hw) to look like brand
1229  * new IEEE 802.11 frame that is ready to go through TX processing again.
1230  * Also, tx_packet_data in cb is restored from tx_control. */
1231 static void ieee80211_remove_tx_extra(struct ieee80211_local *local,
1232                                       struct ieee80211_key *key,
1233                                       struct sk_buff *skb,
1234                                       struct ieee80211_tx_control *control)
1235 {
1236         int hdrlen, iv_len, mic_len;
1237         struct ieee80211_tx_packet_data *pkt_data;
1238
1239         pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1240         pkt_data->ifindex = vif_to_sdata(control->vif)->dev->ifindex;
1241         pkt_data->flags = 0;
1242         if (control->flags & IEEE80211_TXCTL_REQ_TX_STATUS)
1243                 pkt_data->flags |= IEEE80211_TXPD_REQ_TX_STATUS;
1244         if (control->flags & IEEE80211_TXCTL_DO_NOT_ENCRYPT)
1245                 pkt_data->flags |= IEEE80211_TXPD_DO_NOT_ENCRYPT;
1246         if (control->flags & IEEE80211_TXCTL_REQUEUE)
1247                 pkt_data->flags |= IEEE80211_TXPD_REQUEUE;
1248         if (control->flags & IEEE80211_TXCTL_EAPOL_FRAME)
1249                 pkt_data->flags |= IEEE80211_TXPD_EAPOL_FRAME;
1250         pkt_data->queue = control->queue;
1251
1252         hdrlen = ieee80211_get_hdrlen_from_skb(skb);
1253
1254         if (!key)
1255                 goto no_key;
1256
1257         switch (key->conf.alg) {
1258         case ALG_WEP:
1259                 iv_len = WEP_IV_LEN;
1260                 mic_len = WEP_ICV_LEN;
1261                 break;
1262         case ALG_TKIP:
1263                 iv_len = TKIP_IV_LEN;
1264                 mic_len = TKIP_ICV_LEN;
1265                 break;
1266         case ALG_CCMP:
1267                 iv_len = CCMP_HDR_LEN;
1268                 mic_len = CCMP_MIC_LEN;
1269                 break;
1270         default:
1271                 goto no_key;
1272         }
1273
1274         if (skb->len >= mic_len &&
1275             !(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
1276                 skb_trim(skb, skb->len - mic_len);
1277         if (skb->len >= iv_len && skb->len > hdrlen) {
1278                 memmove(skb->data + iv_len, skb->data, hdrlen);
1279                 skb_pull(skb, iv_len);
1280         }
1281
1282 no_key:
1283         {
1284                 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1285                 u16 fc = le16_to_cpu(hdr->frame_control);
1286                 if ((fc & 0x8C) == 0x88) /* QoS Control Field */ {
1287                         fc &= ~IEEE80211_STYPE_QOS_DATA;
1288                         hdr->frame_control = cpu_to_le16(fc);
1289                         memmove(skb->data + 2, skb->data, hdrlen - 2);
1290                         skb_pull(skb, 2);
1291                 }
1292         }
1293 }
1294
1295 static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
1296                                             struct sta_info *sta,
1297                                             struct sk_buff *skb,
1298                                             struct ieee80211_tx_status *status)
1299 {
1300         sta->tx_filtered_count++;
1301
1302         /*
1303          * Clear the TX filter mask for this STA when sending the next
1304          * packet. If the STA went to power save mode, this will happen
1305          * happen when it wakes up for the next time.
1306          */
1307         sta->flags |= WLAN_STA_CLEAR_PS_FILT;
1308
1309         /*
1310          * This code races in the following way:
1311          *
1312          *  (1) STA sends frame indicating it will go to sleep and does so
1313          *  (2) hardware/firmware adds STA to filter list, passes frame up
1314          *  (3) hardware/firmware processes TX fifo and suppresses a frame
1315          *  (4) we get TX status before having processed the frame and
1316          *      knowing that the STA has gone to sleep.
1317          *
1318          * This is actually quite unlikely even when both those events are
1319          * processed from interrupts coming in quickly after one another or
1320          * even at the same time because we queue both TX status events and
1321          * RX frames to be processed by a tasklet and process them in the
1322          * same order that they were received or TX status last. Hence, there
1323          * is no race as long as the frame RX is processed before the next TX
1324          * status, which drivers can ensure, see below.
1325          *
1326          * Note that this can only happen if the hardware or firmware can
1327          * actually add STAs to the filter list, if this is done by the
1328          * driver in response to set_tim() (which will only reduce the race
1329          * this whole filtering tries to solve, not completely solve it)
1330          * this situation cannot happen.
1331          *
1332          * To completely solve this race drivers need to make sure that they
1333          *  (a) don't mix the irq-safe/not irq-safe TX status/RX processing
1334          *      functions and
1335          *  (b) always process RX events before TX status events if ordering
1336          *      can be unknown, for example with different interrupt status
1337          *      bits.
1338          */
1339         if (sta->flags & WLAN_STA_PS &&
1340             skb_queue_len(&sta->tx_filtered) < STA_MAX_TX_BUFFER) {
1341                 ieee80211_remove_tx_extra(local, sta->key, skb,
1342                                           &status->control);
1343                 skb_queue_tail(&sta->tx_filtered, skb);
1344                 return;
1345         }
1346
1347         if (!(sta->flags & WLAN_STA_PS) &&
1348             !(status->control.flags & IEEE80211_TXCTL_REQUEUE)) {
1349                 /* Software retry the packet once */
1350                 status->control.flags |= IEEE80211_TXCTL_REQUEUE;
1351                 ieee80211_remove_tx_extra(local, sta->key, skb,
1352                                           &status->control);
1353                 dev_queue_xmit(skb);
1354                 return;
1355         }
1356
1357         if (net_ratelimit())
1358                 printk(KERN_DEBUG "%s: dropped TX filtered frame, "
1359                        "queue_len=%d PS=%d @%lu\n",
1360                        wiphy_name(local->hw.wiphy),
1361                        skb_queue_len(&sta->tx_filtered),
1362                        !!(sta->flags & WLAN_STA_PS), jiffies);
1363         dev_kfree_skb(skb);
1364 }
1365
1366 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb,
1367                          struct ieee80211_tx_status *status)
1368 {
1369         struct sk_buff *skb2;
1370         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1371         struct ieee80211_local *local = hw_to_local(hw);
1372         u16 frag, type;
1373         struct ieee80211_tx_status_rtap_hdr *rthdr;
1374         struct ieee80211_sub_if_data *sdata;
1375         struct net_device *prev_dev = NULL;
1376
1377         if (!status) {
1378                 printk(KERN_ERR
1379                        "%s: ieee80211_tx_status called with NULL status\n",
1380                        wiphy_name(local->hw.wiphy));
1381                 dev_kfree_skb(skb);
1382                 return;
1383         }
1384
1385         rcu_read_lock();
1386
1387         if (status->excessive_retries) {
1388                 struct sta_info *sta;
1389                 sta = sta_info_get(local, hdr->addr1);
1390                 if (sta) {
1391                         if (sta->flags & WLAN_STA_PS) {
1392                                 /*
1393                                  * The STA is in power save mode, so assume
1394                                  * that this TX packet failed because of that.
1395                                  */
1396                                 status->excessive_retries = 0;
1397                                 status->flags |= IEEE80211_TX_STATUS_TX_FILTERED;
1398                                 ieee80211_handle_filtered_frame(local, sta,
1399                                                                 skb, status);
1400                                 rcu_read_unlock();
1401                                 return;
1402                         }
1403                 }
1404         }
1405
1406         if (status->flags & IEEE80211_TX_STATUS_TX_FILTERED) {
1407                 struct sta_info *sta;
1408                 sta = sta_info_get(local, hdr->addr1);
1409                 if (sta) {
1410                         ieee80211_handle_filtered_frame(local, sta, skb,
1411                                                         status);
1412                         rcu_read_unlock();
1413                         return;
1414                 }
1415         } else
1416                 rate_control_tx_status(local->mdev, skb, status);
1417
1418         rcu_read_unlock();
1419
1420         ieee80211_led_tx(local, 0);
1421
1422         /* SNMP counters
1423          * Fragments are passed to low-level drivers as separate skbs, so these
1424          * are actually fragments, not frames. Update frame counters only for
1425          * the first fragment of the frame. */
1426
1427         frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG;
1428         type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE;
1429
1430         if (status->flags & IEEE80211_TX_STATUS_ACK) {
1431                 if (frag == 0) {
1432                         local->dot11TransmittedFrameCount++;
1433                         if (is_multicast_ether_addr(hdr->addr1))
1434                                 local->dot11MulticastTransmittedFrameCount++;
1435                         if (status->retry_count > 0)
1436                                 local->dot11RetryCount++;
1437                         if (status->retry_count > 1)
1438                                 local->dot11MultipleRetryCount++;
1439                 }
1440
1441                 /* This counter shall be incremented for an acknowledged MPDU
1442                  * with an individual address in the address 1 field or an MPDU
1443                  * with a multicast address in the address 1 field of type Data
1444                  * or Management. */
1445                 if (!is_multicast_ether_addr(hdr->addr1) ||
1446                     type == IEEE80211_FTYPE_DATA ||
1447                     type == IEEE80211_FTYPE_MGMT)
1448                         local->dot11TransmittedFragmentCount++;
1449         } else {
1450                 if (frag == 0)
1451                         local->dot11FailedCount++;
1452         }
1453
1454         /* this was a transmitted frame, but now we want to reuse it */
1455         skb_orphan(skb);
1456
1457         /*
1458          * This is a bit racy but we can avoid a lot of work
1459          * with this test...
1460          */
1461         if (!local->monitors && !local->cooked_mntrs) {
1462                 dev_kfree_skb(skb);
1463                 return;
1464         }
1465
1466         /* send frame to monitor interfaces now */
1467
1468         if (skb_headroom(skb) < sizeof(*rthdr)) {
1469                 printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
1470                 dev_kfree_skb(skb);
1471                 return;
1472         }
1473
1474         rthdr = (struct ieee80211_tx_status_rtap_hdr*)
1475                                 skb_push(skb, sizeof(*rthdr));
1476
1477         memset(rthdr, 0, sizeof(*rthdr));
1478         rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
1479         rthdr->hdr.it_present =
1480                 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
1481                             (1 << IEEE80211_RADIOTAP_DATA_RETRIES));
1482
1483         if (!(status->flags & IEEE80211_TX_STATUS_ACK) &&
1484             !is_multicast_ether_addr(hdr->addr1))
1485                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL);
1486
1487         if ((status->control.flags & IEEE80211_TXCTL_USE_RTS_CTS) &&
1488             (status->control.flags & IEEE80211_TXCTL_USE_CTS_PROTECT))
1489                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS);
1490         else if (status->control.flags & IEEE80211_TXCTL_USE_RTS_CTS)
1491                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS);
1492
1493         rthdr->data_retries = status->retry_count;
1494
1495         /* XXX: is this sufficient for BPF? */
1496         skb_set_mac_header(skb, 0);
1497         skb->ip_summed = CHECKSUM_UNNECESSARY;
1498         skb->pkt_type = PACKET_OTHERHOST;
1499         skb->protocol = htons(ETH_P_802_2);
1500         memset(skb->cb, 0, sizeof(skb->cb));
1501
1502         rcu_read_lock();
1503         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
1504                 if (sdata->vif.type == IEEE80211_IF_TYPE_MNTR) {
1505                         if (!netif_running(sdata->dev))
1506                                 continue;
1507
1508                         if (prev_dev) {
1509                                 skb2 = skb_clone(skb, GFP_ATOMIC);
1510                                 if (skb2) {
1511                                         skb2->dev = prev_dev;
1512                                         netif_rx(skb2);
1513                                 }
1514                         }
1515
1516                         prev_dev = sdata->dev;
1517                 }
1518         }
1519         if (prev_dev) {
1520                 skb->dev = prev_dev;
1521                 netif_rx(skb);
1522                 skb = NULL;
1523         }
1524         rcu_read_unlock();
1525         dev_kfree_skb(skb);
1526 }
1527 EXPORT_SYMBOL(ieee80211_tx_status);
1528
1529 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
1530                                         const struct ieee80211_ops *ops)
1531 {
1532         struct ieee80211_local *local;
1533         int priv_size;
1534         struct wiphy *wiphy;
1535
1536         /* Ensure 32-byte alignment of our private data and hw private data.
1537          * We use the wiphy priv data for both our ieee80211_local and for
1538          * the driver's private data
1539          *
1540          * In memory it'll be like this:
1541          *
1542          * +-------------------------+
1543          * | struct wiphy           |
1544          * +-------------------------+
1545          * | struct ieee80211_local  |
1546          * +-------------------------+
1547          * | driver's private data   |
1548          * +-------------------------+
1549          *
1550          */
1551         priv_size = ((sizeof(struct ieee80211_local) +
1552                       NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST) +
1553                     priv_data_len;
1554
1555         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
1556
1557         if (!wiphy)
1558                 return NULL;
1559
1560         wiphy->privid = mac80211_wiphy_privid;
1561
1562         local = wiphy_priv(wiphy);
1563         local->hw.wiphy = wiphy;
1564
1565         local->hw.priv = (char *)local +
1566                          ((sizeof(struct ieee80211_local) +
1567                            NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);
1568
1569         BUG_ON(!ops->tx);
1570         BUG_ON(!ops->start);
1571         BUG_ON(!ops->stop);
1572         BUG_ON(!ops->config);
1573         BUG_ON(!ops->add_interface);
1574         BUG_ON(!ops->remove_interface);
1575         BUG_ON(!ops->configure_filter);
1576         local->ops = ops;
1577
1578         local->hw.queues = 1; /* default */
1579
1580         local->bridge_packets = 1;
1581
1582         local->rts_threshold = IEEE80211_MAX_RTS_THRESHOLD;
1583         local->fragmentation_threshold = IEEE80211_MAX_FRAG_THRESHOLD;
1584         local->short_retry_limit = 7;
1585         local->long_retry_limit = 4;
1586         local->hw.conf.radio_enabled = 1;
1587
1588         INIT_LIST_HEAD(&local->interfaces);
1589
1590         spin_lock_init(&local->key_lock);
1591
1592         INIT_DELAYED_WORK(&local->scan_work, ieee80211_sta_scan_work);
1593
1594         sta_info_init(local);
1595
1596         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
1597                      (unsigned long)local);
1598         tasklet_disable(&local->tx_pending_tasklet);
1599
1600         tasklet_init(&local->tasklet,
1601                      ieee80211_tasklet_handler,
1602                      (unsigned long) local);
1603         tasklet_disable(&local->tasklet);
1604
1605         skb_queue_head_init(&local->skb_queue);
1606         skb_queue_head_init(&local->skb_queue_unreliable);
1607
1608         return local_to_hw(local);
1609 }
1610 EXPORT_SYMBOL(ieee80211_alloc_hw);
1611
1612 int ieee80211_register_hw(struct ieee80211_hw *hw)
1613 {
1614         struct ieee80211_local *local = hw_to_local(hw);
1615         const char *name;
1616         int result;
1617         enum ieee80211_band band;
1618         struct net_device *mdev;
1619         struct ieee80211_sub_if_data *sdata;
1620
1621         /*
1622          * generic code guarantees at least one band,
1623          * set this very early because much code assumes
1624          * that hw.conf.channel is assigned
1625          */
1626         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1627                 struct ieee80211_supported_band *sband;
1628
1629                 sband = local->hw.wiphy->bands[band];
1630                 if (sband) {
1631                         /* init channel we're on */
1632                         local->hw.conf.channel =
1633                         local->oper_channel =
1634                         local->scan_channel = &sband->channels[0];
1635                         break;
1636                 }
1637         }
1638
1639         result = wiphy_register(local->hw.wiphy);
1640         if (result < 0)
1641                 return result;
1642
1643         /* for now, mdev needs sub_if_data :/ */
1644         mdev = alloc_netdev(sizeof(struct ieee80211_sub_if_data),
1645                             "wmaster%d", ether_setup);
1646         if (!mdev)
1647                 goto fail_mdev_alloc;
1648
1649         sdata = IEEE80211_DEV_TO_SUB_IF(mdev);
1650         mdev->ieee80211_ptr = &sdata->wdev;
1651         sdata->wdev.wiphy = local->hw.wiphy;
1652
1653         local->mdev = mdev;
1654
1655         ieee80211_rx_bss_list_init(mdev);
1656
1657         mdev->hard_start_xmit = ieee80211_master_start_xmit;
1658         mdev->open = ieee80211_master_open;
1659         mdev->stop = ieee80211_master_stop;
1660         mdev->type = ARPHRD_IEEE80211;
1661         mdev->header_ops = &ieee80211_header_ops;
1662         mdev->set_multicast_list = ieee80211_master_set_multicast_list;
1663
1664         sdata->vif.type = IEEE80211_IF_TYPE_AP;
1665         sdata->dev = mdev;
1666         sdata->local = local;
1667         sdata->u.ap.force_unicast_rateidx = -1;
1668         sdata->u.ap.max_ratectrl_rateidx = -1;
1669         ieee80211_if_sdata_init(sdata);
1670
1671         /* no RCU needed since we're still during init phase */
1672         list_add_tail(&sdata->list, &local->interfaces);
1673
1674         name = wiphy_dev(local->hw.wiphy)->driver->name;
1675         local->hw.workqueue = create_singlethread_workqueue(name);
1676         if (!local->hw.workqueue) {
1677                 result = -ENOMEM;
1678                 goto fail_workqueue;
1679         }
1680
1681         /*
1682          * The hardware needs headroom for sending the frame,
1683          * and we need some headroom for passing the frame to monitor
1684          * interfaces, but never both at the same time.
1685          */
1686         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
1687                                    sizeof(struct ieee80211_tx_status_rtap_hdr));
1688
1689         debugfs_hw_add(local);
1690
1691         local->hw.conf.beacon_int = 1000;
1692
1693         local->wstats_flags |= local->hw.max_rssi ?
1694                                IW_QUAL_LEVEL_UPDATED : IW_QUAL_LEVEL_INVALID;
1695         local->wstats_flags |= local->hw.max_signal ?
1696                                IW_QUAL_QUAL_UPDATED : IW_QUAL_QUAL_INVALID;
1697         local->wstats_flags |= local->hw.max_noise ?
1698                                IW_QUAL_NOISE_UPDATED : IW_QUAL_NOISE_INVALID;
1699         if (local->hw.max_rssi < 0 || local->hw.max_noise < 0)
1700                 local->wstats_flags |= IW_QUAL_DBM;
1701
1702         result = sta_info_start(local);
1703         if (result < 0)
1704                 goto fail_sta_info;
1705
1706         rtnl_lock();
1707         result = dev_alloc_name(local->mdev, local->mdev->name);
1708         if (result < 0)
1709                 goto fail_dev;
1710
1711         memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1712         SET_NETDEV_DEV(local->mdev, wiphy_dev(local->hw.wiphy));
1713
1714         result = register_netdevice(local->mdev);
1715         if (result < 0)
1716                 goto fail_dev;
1717
1718         ieee80211_debugfs_add_netdev(IEEE80211_DEV_TO_SUB_IF(local->mdev));
1719         ieee80211_if_set_type(local->mdev, IEEE80211_IF_TYPE_AP);
1720
1721         result = ieee80211_init_rate_ctrl_alg(local,
1722                                               hw->rate_control_algorithm);
1723         if (result < 0) {
1724                 printk(KERN_DEBUG "%s: Failed to initialize rate control "
1725                        "algorithm\n", wiphy_name(local->hw.wiphy));
1726                 goto fail_rate;
1727         }
1728
1729         result = ieee80211_wep_init(local);
1730
1731         if (result < 0) {
1732                 printk(KERN_DEBUG "%s: Failed to initialize wep\n",
1733                        wiphy_name(local->hw.wiphy));
1734                 goto fail_wep;
1735         }
1736
1737         ieee80211_install_qdisc(local->mdev);
1738
1739         /* add one default STA interface */
1740         result = ieee80211_if_add(local->mdev, "wlan%d", NULL,
1741                                   IEEE80211_IF_TYPE_STA, NULL);
1742         if (result)
1743                 printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
1744                        wiphy_name(local->hw.wiphy));
1745
1746         local->reg_state = IEEE80211_DEV_REGISTERED;
1747         rtnl_unlock();
1748
1749         ieee80211_led_init(local);
1750
1751         return 0;
1752
1753 fail_wep:
1754         rate_control_deinitialize(local);
1755 fail_rate:
1756         ieee80211_debugfs_remove_netdev(IEEE80211_DEV_TO_SUB_IF(local->mdev));
1757         unregister_netdevice(local->mdev);
1758 fail_dev:
1759         rtnl_unlock();
1760         sta_info_stop(local);
1761 fail_sta_info:
1762         debugfs_hw_del(local);
1763         destroy_workqueue(local->hw.workqueue);
1764 fail_workqueue:
1765         ieee80211_if_free(local->mdev);
1766         local->mdev = NULL;
1767 fail_mdev_alloc:
1768         wiphy_unregister(local->hw.wiphy);
1769         return result;
1770 }
1771 EXPORT_SYMBOL(ieee80211_register_hw);
1772
1773 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
1774 {
1775         struct ieee80211_local *local = hw_to_local(hw);
1776         struct ieee80211_sub_if_data *sdata, *tmp;
1777
1778         tasklet_kill(&local->tx_pending_tasklet);
1779         tasklet_kill(&local->tasklet);
1780
1781         rtnl_lock();
1782
1783         BUG_ON(local->reg_state != IEEE80211_DEV_REGISTERED);
1784
1785         local->reg_state = IEEE80211_DEV_UNREGISTERED;
1786
1787         /*
1788          * At this point, interface list manipulations are fine
1789          * because the driver cannot be handing us frames any
1790          * more and the tasklet is killed.
1791          */
1792
1793         /*
1794          * First, we remove all non-master interfaces. Do this because they
1795          * may have bss pointer dependency on the master, and when we free
1796          * the master these would be freed as well, breaking our list
1797          * iteration completely.
1798          */
1799         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1800                 if (sdata->dev == local->mdev)
1801                         continue;
1802                 list_del(&sdata->list);
1803                 __ieee80211_if_del(local, sdata);
1804         }
1805
1806         /* then, finally, remove the master interface */
1807         __ieee80211_if_del(local, IEEE80211_DEV_TO_SUB_IF(local->mdev));
1808
1809         rtnl_unlock();
1810
1811         ieee80211_rx_bss_list_deinit(local->mdev);
1812         ieee80211_clear_tx_pending(local);
1813         sta_info_stop(local);
1814         rate_control_deinitialize(local);
1815         debugfs_hw_del(local);
1816
1817         if (skb_queue_len(&local->skb_queue)
1818                         || skb_queue_len(&local->skb_queue_unreliable))
1819                 printk(KERN_WARNING "%s: skb_queue not empty\n",
1820                        wiphy_name(local->hw.wiphy));
1821         skb_queue_purge(&local->skb_queue);
1822         skb_queue_purge(&local->skb_queue_unreliable);
1823
1824         destroy_workqueue(local->hw.workqueue);
1825         wiphy_unregister(local->hw.wiphy);
1826         ieee80211_wep_free(local);
1827         ieee80211_led_exit(local);
1828         ieee80211_if_free(local->mdev);
1829         local->mdev = NULL;
1830 }
1831 EXPORT_SYMBOL(ieee80211_unregister_hw);
1832
1833 void ieee80211_free_hw(struct ieee80211_hw *hw)
1834 {
1835         struct ieee80211_local *local = hw_to_local(hw);
1836
1837         wiphy_free(local->hw.wiphy);
1838 }
1839 EXPORT_SYMBOL(ieee80211_free_hw);
1840
1841 static int __init ieee80211_init(void)
1842 {
1843         struct sk_buff *skb;
1844         int ret;
1845
1846         BUILD_BUG_ON(sizeof(struct ieee80211_tx_packet_data) > sizeof(skb->cb));
1847
1848         ret = rc80211_pid_init();
1849         if (ret)
1850                 goto out;
1851
1852         ret = ieee80211_wme_register();
1853         if (ret) {
1854                 printk(KERN_DEBUG "ieee80211_init: failed to "
1855                        "initialize WME (err=%d)\n", ret);
1856                 goto out_cleanup_pid;
1857         }
1858
1859         ieee80211_debugfs_netdev_init();
1860
1861         return 0;
1862
1863  out_cleanup_pid:
1864         rc80211_pid_exit();
1865  out:
1866         return ret;
1867 }
1868
1869 static void __exit ieee80211_exit(void)
1870 {
1871         rc80211_pid_exit();
1872
1873         /*
1874          * For key todo, it'll be empty by now but the work
1875          * might still be scheduled.
1876          */
1877         flush_scheduled_work();
1878
1879         if (mesh_allocated)
1880                 ieee80211s_stop();
1881
1882         ieee80211_wme_unregister();
1883         ieee80211_debugfs_netdev_exit();
1884 }
1885
1886
1887 subsys_initcall(ieee80211_init);
1888 module_exit(ieee80211_exit);
1889
1890 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1891 MODULE_LICENSE("GPL");