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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         INIT_DELAYED_WORK(&local->scan_work, ieee80211_sta_scan_work);
1591
1592         sta_info_init(local);
1593
1594         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
1595                      (unsigned long)local);
1596         tasklet_disable(&local->tx_pending_tasklet);
1597
1598         tasklet_init(&local->tasklet,
1599                      ieee80211_tasklet_handler,
1600                      (unsigned long) local);
1601         tasklet_disable(&local->tasklet);
1602
1603         skb_queue_head_init(&local->skb_queue);
1604         skb_queue_head_init(&local->skb_queue_unreliable);
1605
1606         return local_to_hw(local);
1607 }
1608 EXPORT_SYMBOL(ieee80211_alloc_hw);
1609
1610 int ieee80211_register_hw(struct ieee80211_hw *hw)
1611 {
1612         struct ieee80211_local *local = hw_to_local(hw);
1613         const char *name;
1614         int result;
1615         enum ieee80211_band band;
1616         struct net_device *mdev;
1617         struct ieee80211_sub_if_data *sdata;
1618
1619         /*
1620          * generic code guarantees at least one band,
1621          * set this very early because much code assumes
1622          * that hw.conf.channel is assigned
1623          */
1624         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1625                 struct ieee80211_supported_band *sband;
1626
1627                 sband = local->hw.wiphy->bands[band];
1628                 if (sband) {
1629                         /* init channel we're on */
1630                         local->hw.conf.channel =
1631                         local->oper_channel =
1632                         local->scan_channel = &sband->channels[0];
1633                         break;
1634                 }
1635         }
1636
1637         result = wiphy_register(local->hw.wiphy);
1638         if (result < 0)
1639                 return result;
1640
1641         /* for now, mdev needs sub_if_data :/ */
1642         mdev = alloc_netdev(sizeof(struct ieee80211_sub_if_data),
1643                             "wmaster%d", ether_setup);
1644         if (!mdev)
1645                 goto fail_mdev_alloc;
1646
1647         sdata = IEEE80211_DEV_TO_SUB_IF(mdev);
1648         mdev->ieee80211_ptr = &sdata->wdev;
1649         sdata->wdev.wiphy = local->hw.wiphy;
1650
1651         local->mdev = mdev;
1652
1653         ieee80211_rx_bss_list_init(mdev);
1654
1655         mdev->hard_start_xmit = ieee80211_master_start_xmit;
1656         mdev->open = ieee80211_master_open;
1657         mdev->stop = ieee80211_master_stop;
1658         mdev->type = ARPHRD_IEEE80211;
1659         mdev->header_ops = &ieee80211_header_ops;
1660         mdev->set_multicast_list = ieee80211_master_set_multicast_list;
1661
1662         sdata->vif.type = IEEE80211_IF_TYPE_AP;
1663         sdata->dev = mdev;
1664         sdata->local = local;
1665         sdata->u.ap.force_unicast_rateidx = -1;
1666         sdata->u.ap.max_ratectrl_rateidx = -1;
1667         ieee80211_if_sdata_init(sdata);
1668
1669         /* no RCU needed since we're still during init phase */
1670         list_add_tail(&sdata->list, &local->interfaces);
1671
1672         name = wiphy_dev(local->hw.wiphy)->driver->name;
1673         local->hw.workqueue = create_singlethread_workqueue(name);
1674         if (!local->hw.workqueue) {
1675                 result = -ENOMEM;
1676                 goto fail_workqueue;
1677         }
1678
1679         /*
1680          * The hardware needs headroom for sending the frame,
1681          * and we need some headroom for passing the frame to monitor
1682          * interfaces, but never both at the same time.
1683          */
1684         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
1685                                    sizeof(struct ieee80211_tx_status_rtap_hdr));
1686
1687         debugfs_hw_add(local);
1688
1689         local->hw.conf.beacon_int = 1000;
1690
1691         local->wstats_flags |= local->hw.max_rssi ?
1692                                IW_QUAL_LEVEL_UPDATED : IW_QUAL_LEVEL_INVALID;
1693         local->wstats_flags |= local->hw.max_signal ?
1694                                IW_QUAL_QUAL_UPDATED : IW_QUAL_QUAL_INVALID;
1695         local->wstats_flags |= local->hw.max_noise ?
1696                                IW_QUAL_NOISE_UPDATED : IW_QUAL_NOISE_INVALID;
1697         if (local->hw.max_rssi < 0 || local->hw.max_noise < 0)
1698                 local->wstats_flags |= IW_QUAL_DBM;
1699
1700         result = sta_info_start(local);
1701         if (result < 0)
1702                 goto fail_sta_info;
1703
1704         rtnl_lock();
1705         result = dev_alloc_name(local->mdev, local->mdev->name);
1706         if (result < 0)
1707                 goto fail_dev;
1708
1709         memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1710         SET_NETDEV_DEV(local->mdev, wiphy_dev(local->hw.wiphy));
1711
1712         result = register_netdevice(local->mdev);
1713         if (result < 0)
1714                 goto fail_dev;
1715
1716         ieee80211_debugfs_add_netdev(IEEE80211_DEV_TO_SUB_IF(local->mdev));
1717         ieee80211_if_set_type(local->mdev, IEEE80211_IF_TYPE_AP);
1718
1719         result = ieee80211_init_rate_ctrl_alg(local,
1720                                               hw->rate_control_algorithm);
1721         if (result < 0) {
1722                 printk(KERN_DEBUG "%s: Failed to initialize rate control "
1723                        "algorithm\n", wiphy_name(local->hw.wiphy));
1724                 goto fail_rate;
1725         }
1726
1727         result = ieee80211_wep_init(local);
1728
1729         if (result < 0) {
1730                 printk(KERN_DEBUG "%s: Failed to initialize wep\n",
1731                        wiphy_name(local->hw.wiphy));
1732                 goto fail_wep;
1733         }
1734
1735         ieee80211_install_qdisc(local->mdev);
1736
1737         /* add one default STA interface */
1738         result = ieee80211_if_add(local->mdev, "wlan%d", NULL,
1739                                   IEEE80211_IF_TYPE_STA, NULL);
1740         if (result)
1741                 printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
1742                        wiphy_name(local->hw.wiphy));
1743
1744         local->reg_state = IEEE80211_DEV_REGISTERED;
1745         rtnl_unlock();
1746
1747         ieee80211_led_init(local);
1748
1749         return 0;
1750
1751 fail_wep:
1752         rate_control_deinitialize(local);
1753 fail_rate:
1754         ieee80211_debugfs_remove_netdev(IEEE80211_DEV_TO_SUB_IF(local->mdev));
1755         unregister_netdevice(local->mdev);
1756 fail_dev:
1757         rtnl_unlock();
1758         sta_info_stop(local);
1759 fail_sta_info:
1760         debugfs_hw_del(local);
1761         destroy_workqueue(local->hw.workqueue);
1762 fail_workqueue:
1763         ieee80211_if_free(local->mdev);
1764         local->mdev = NULL;
1765 fail_mdev_alloc:
1766         wiphy_unregister(local->hw.wiphy);
1767         return result;
1768 }
1769 EXPORT_SYMBOL(ieee80211_register_hw);
1770
1771 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
1772 {
1773         struct ieee80211_local *local = hw_to_local(hw);
1774         struct ieee80211_sub_if_data *sdata, *tmp;
1775
1776         tasklet_kill(&local->tx_pending_tasklet);
1777         tasklet_kill(&local->tasklet);
1778
1779         rtnl_lock();
1780
1781         BUG_ON(local->reg_state != IEEE80211_DEV_REGISTERED);
1782
1783         local->reg_state = IEEE80211_DEV_UNREGISTERED;
1784
1785         /*
1786          * At this point, interface list manipulations are fine
1787          * because the driver cannot be handing us frames any
1788          * more and the tasklet is killed.
1789          */
1790
1791         /*
1792          * First, we remove all non-master interfaces. Do this because they
1793          * may have bss pointer dependency on the master, and when we free
1794          * the master these would be freed as well, breaking our list
1795          * iteration completely.
1796          */
1797         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1798                 if (sdata->dev == local->mdev)
1799                         continue;
1800                 list_del(&sdata->list);
1801                 __ieee80211_if_del(local, sdata);
1802         }
1803
1804         /* then, finally, remove the master interface */
1805         __ieee80211_if_del(local, IEEE80211_DEV_TO_SUB_IF(local->mdev));
1806
1807         rtnl_unlock();
1808
1809         ieee80211_rx_bss_list_deinit(local->mdev);
1810         ieee80211_clear_tx_pending(local);
1811         sta_info_stop(local);
1812         rate_control_deinitialize(local);
1813         debugfs_hw_del(local);
1814
1815         if (skb_queue_len(&local->skb_queue)
1816                         || skb_queue_len(&local->skb_queue_unreliable))
1817                 printk(KERN_WARNING "%s: skb_queue not empty\n",
1818                        wiphy_name(local->hw.wiphy));
1819         skb_queue_purge(&local->skb_queue);
1820         skb_queue_purge(&local->skb_queue_unreliable);
1821
1822         destroy_workqueue(local->hw.workqueue);
1823         wiphy_unregister(local->hw.wiphy);
1824         ieee80211_wep_free(local);
1825         ieee80211_led_exit(local);
1826         ieee80211_if_free(local->mdev);
1827         local->mdev = NULL;
1828 }
1829 EXPORT_SYMBOL(ieee80211_unregister_hw);
1830
1831 void ieee80211_free_hw(struct ieee80211_hw *hw)
1832 {
1833         struct ieee80211_local *local = hw_to_local(hw);
1834
1835         wiphy_free(local->hw.wiphy);
1836 }
1837 EXPORT_SYMBOL(ieee80211_free_hw);
1838
1839 static int __init ieee80211_init(void)
1840 {
1841         struct sk_buff *skb;
1842         int ret;
1843
1844         BUILD_BUG_ON(sizeof(struct ieee80211_tx_packet_data) > sizeof(skb->cb));
1845
1846         ret = rc80211_pid_init();
1847         if (ret)
1848                 goto out;
1849
1850         ret = ieee80211_wme_register();
1851         if (ret) {
1852                 printk(KERN_DEBUG "ieee80211_init: failed to "
1853                        "initialize WME (err=%d)\n", ret);
1854                 goto out_cleanup_pid;
1855         }
1856
1857         ieee80211_debugfs_netdev_init();
1858
1859         return 0;
1860
1861  out_cleanup_pid:
1862         rc80211_pid_exit();
1863  out:
1864         return ret;
1865 }
1866
1867 static void __exit ieee80211_exit(void)
1868 {
1869         rc80211_pid_exit();
1870
1871         /*
1872          * For key todo, it'll be empty by now but the work
1873          * might still be scheduled.
1874          */
1875         flush_scheduled_work();
1876
1877         if (mesh_allocated)
1878                 ieee80211s_stop();
1879
1880         ieee80211_wme_unregister();
1881         ieee80211_debugfs_netdev_exit();
1882 }
1883
1884
1885 subsys_initcall(ieee80211_init);
1886 module_exit(ieee80211_exit);
1887
1888 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1889 MODULE_LICENSE("GPL");