mac80211: move TX info into skb->cb
[linux-2.6.git] / 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 /*
39  * For seeing transmitted packets on monitor interfaces
40  * we have a radiotap header too.
41  */
42 struct ieee80211_tx_status_rtap_hdr {
43         struct ieee80211_radiotap_header hdr;
44         __le16 tx_flags;
45         u8 data_retries;
46 } __attribute__ ((packed));
47
48 /* common interface routines */
49
50 static int header_parse_80211(const struct sk_buff *skb, unsigned char *haddr)
51 {
52         memcpy(haddr, skb_mac_header(skb) + 10, ETH_ALEN); /* addr2 */
53         return ETH_ALEN;
54 }
55
56 /* must be called under mdev tx lock */
57 static void ieee80211_configure_filter(struct ieee80211_local *local)
58 {
59         unsigned int changed_flags;
60         unsigned int new_flags = 0;
61
62         if (atomic_read(&local->iff_promiscs))
63                 new_flags |= FIF_PROMISC_IN_BSS;
64
65         if (atomic_read(&local->iff_allmultis))
66                 new_flags |= FIF_ALLMULTI;
67
68         if (local->monitors)
69                 new_flags |= FIF_BCN_PRBRESP_PROMISC;
70
71         if (local->fif_fcsfail)
72                 new_flags |= FIF_FCSFAIL;
73
74         if (local->fif_plcpfail)
75                 new_flags |= FIF_PLCPFAIL;
76
77         if (local->fif_control)
78                 new_flags |= FIF_CONTROL;
79
80         if (local->fif_other_bss)
81                 new_flags |= FIF_OTHER_BSS;
82
83         changed_flags = local->filter_flags ^ new_flags;
84
85         /* be a bit nasty */
86         new_flags |= (1<<31);
87
88         local->ops->configure_filter(local_to_hw(local),
89                                      changed_flags, &new_flags,
90                                      local->mdev->mc_count,
91                                      local->mdev->mc_list);
92
93         WARN_ON(new_flags & (1<<31));
94
95         local->filter_flags = new_flags & ~(1<<31);
96 }
97
98 /* master interface */
99
100 static int ieee80211_master_open(struct net_device *dev)
101 {
102         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
103         struct ieee80211_sub_if_data *sdata;
104         int res = -EOPNOTSUPP;
105
106         /* we hold the RTNL here so can safely walk the list */
107         list_for_each_entry(sdata, &local->interfaces, list) {
108                 if (sdata->dev != dev && netif_running(sdata->dev)) {
109                         res = 0;
110                         break;
111                 }
112         }
113
114         if (res)
115                 return res;
116
117         netif_start_queue(local->mdev);
118
119         return 0;
120 }
121
122 static int ieee80211_master_stop(struct net_device *dev)
123 {
124         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
125         struct ieee80211_sub_if_data *sdata;
126
127         /* we hold the RTNL here so can safely walk the list */
128         list_for_each_entry(sdata, &local->interfaces, list)
129                 if (sdata->dev != dev && netif_running(sdata->dev))
130                         dev_close(sdata->dev);
131
132         return 0;
133 }
134
135 static void ieee80211_master_set_multicast_list(struct net_device *dev)
136 {
137         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
138
139         ieee80211_configure_filter(local);
140 }
141
142 /* regular interfaces */
143
144 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
145 {
146         int meshhdrlen;
147         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
148
149         meshhdrlen = (sdata->vif.type == IEEE80211_IF_TYPE_MESH_POINT) ? 5 : 0;
150
151         /* FIX: what would be proper limits for MTU?
152          * This interface uses 802.3 frames. */
153         if (new_mtu < 256 ||
154                 new_mtu > IEEE80211_MAX_DATA_LEN - 24 - 6 - meshhdrlen) {
155                 printk(KERN_WARNING "%s: invalid MTU %d\n",
156                        dev->name, new_mtu);
157                 return -EINVAL;
158         }
159
160 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
161         printk(KERN_DEBUG "%s: setting MTU %d\n", dev->name, new_mtu);
162 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
163         dev->mtu = new_mtu;
164         return 0;
165 }
166
167 static inline int identical_mac_addr_allowed(int type1, int type2)
168 {
169         return (type1 == IEEE80211_IF_TYPE_MNTR ||
170                 type2 == IEEE80211_IF_TYPE_MNTR ||
171                 (type1 == IEEE80211_IF_TYPE_AP &&
172                  type2 == IEEE80211_IF_TYPE_WDS) ||
173                 (type1 == IEEE80211_IF_TYPE_WDS &&
174                  (type2 == IEEE80211_IF_TYPE_WDS ||
175                   type2 == IEEE80211_IF_TYPE_AP)) ||
176                 (type1 == IEEE80211_IF_TYPE_AP &&
177                  type2 == IEEE80211_IF_TYPE_VLAN) ||
178                 (type1 == IEEE80211_IF_TYPE_VLAN &&
179                  (type2 == IEEE80211_IF_TYPE_AP ||
180                   type2 == IEEE80211_IF_TYPE_VLAN)));
181 }
182
183 static int ieee80211_open(struct net_device *dev)
184 {
185         struct ieee80211_sub_if_data *sdata, *nsdata;
186         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
187         struct ieee80211_if_init_conf conf;
188         int res;
189         bool need_hw_reconfig = 0;
190         struct sta_info *sta;
191
192         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
193
194         /* we hold the RTNL here so can safely walk the list */
195         list_for_each_entry(nsdata, &local->interfaces, list) {
196                 struct net_device *ndev = nsdata->dev;
197
198                 if (ndev != dev && ndev != local->mdev && netif_running(ndev)) {
199                         /*
200                          * Allow only a single IBSS interface to be up at any
201                          * time. This is restricted because beacon distribution
202                          * cannot work properly if both are in the same IBSS.
203                          *
204                          * To remove this restriction we'd have to disallow them
205                          * from setting the same SSID on different IBSS interfaces
206                          * belonging to the same hardware. Then, however, we're
207                          * faced with having to adopt two different TSF timers...
208                          */
209                         if (sdata->vif.type == IEEE80211_IF_TYPE_IBSS &&
210                             nsdata->vif.type == IEEE80211_IF_TYPE_IBSS)
211                                 return -EBUSY;
212
213                         /*
214                          * Disallow multiple IBSS/STA mode interfaces.
215                          *
216                          * This is a technical restriction, it is possible although
217                          * most likely not IEEE 802.11 compliant to have multiple
218                          * STAs with just a single hardware (the TSF timer will not
219                          * be adjusted properly.)
220                          *
221                          * However, because mac80211 uses the master device's BSS
222                          * information for each STA/IBSS interface, doing this will
223                          * currently corrupt that BSS information completely, unless,
224                          * a not very useful case, both STAs are associated to the
225                          * same BSS.
226                          *
227                          * To remove this restriction, the BSS information needs to
228                          * be embedded in the STA/IBSS mode sdata instead of using
229                          * the master device's BSS structure.
230                          */
231                         if ((sdata->vif.type == IEEE80211_IF_TYPE_STA ||
232                              sdata->vif.type == IEEE80211_IF_TYPE_IBSS) &&
233                             (nsdata->vif.type == IEEE80211_IF_TYPE_STA ||
234                              nsdata->vif.type == IEEE80211_IF_TYPE_IBSS))
235                                 return -EBUSY;
236
237                         /*
238                          * The remaining checks are only performed for interfaces
239                          * with the same MAC address.
240                          */
241                         if (compare_ether_addr(dev->dev_addr, ndev->dev_addr))
242                                 continue;
243
244                         /*
245                          * check whether it may have the same address
246                          */
247                         if (!identical_mac_addr_allowed(sdata->vif.type,
248                                                         nsdata->vif.type))
249                                 return -ENOTUNIQ;
250
251                         /*
252                          * can only add VLANs to enabled APs
253                          */
254                         if (sdata->vif.type == IEEE80211_IF_TYPE_VLAN &&
255                             nsdata->vif.type == IEEE80211_IF_TYPE_AP)
256                                 sdata->u.vlan.ap = nsdata;
257                 }
258         }
259
260         switch (sdata->vif.type) {
261         case IEEE80211_IF_TYPE_WDS:
262                 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
263                         return -ENOLINK;
264                 break;
265         case IEEE80211_IF_TYPE_VLAN:
266                 if (!sdata->u.vlan.ap)
267                         return -ENOLINK;
268                 break;
269         case IEEE80211_IF_TYPE_AP:
270         case IEEE80211_IF_TYPE_STA:
271         case IEEE80211_IF_TYPE_MNTR:
272         case IEEE80211_IF_TYPE_IBSS:
273         case IEEE80211_IF_TYPE_MESH_POINT:
274                 /* no special treatment */
275                 break;
276         case IEEE80211_IF_TYPE_INVALID:
277                 /* cannot happen */
278                 WARN_ON(1);
279                 break;
280         }
281
282         if (local->open_count == 0) {
283                 res = 0;
284                 if (local->ops->start)
285                         res = local->ops->start(local_to_hw(local));
286                 if (res)
287                         return res;
288                 need_hw_reconfig = 1;
289                 ieee80211_led_radio(local, local->hw.conf.radio_enabled);
290         }
291
292         switch (sdata->vif.type) {
293         case IEEE80211_IF_TYPE_VLAN:
294                 list_add(&sdata->u.vlan.list, &sdata->u.vlan.ap->u.ap.vlans);
295                 /* no need to tell driver */
296                 break;
297         case IEEE80211_IF_TYPE_MNTR:
298                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
299                         local->cooked_mntrs++;
300                         break;
301                 }
302
303                 /* must be before the call to ieee80211_configure_filter */
304                 local->monitors++;
305                 if (local->monitors == 1)
306                         local->hw.conf.flags |= IEEE80211_CONF_RADIOTAP;
307
308                 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
309                         local->fif_fcsfail++;
310                 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
311                         local->fif_plcpfail++;
312                 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL)
313                         local->fif_control++;
314                 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
315                         local->fif_other_bss++;
316
317                 netif_tx_lock_bh(local->mdev);
318                 ieee80211_configure_filter(local);
319                 netif_tx_unlock_bh(local->mdev);
320                 break;
321         case IEEE80211_IF_TYPE_STA:
322         case IEEE80211_IF_TYPE_IBSS:
323                 sdata->u.sta.flags &= ~IEEE80211_STA_PREV_BSSID_SET;
324                 /* fall through */
325         default:
326                 conf.vif = &sdata->vif;
327                 conf.type = sdata->vif.type;
328                 conf.mac_addr = dev->dev_addr;
329                 res = local->ops->add_interface(local_to_hw(local), &conf);
330                 if (res)
331                         goto err_stop;
332
333                 ieee80211_if_config(dev);
334                 ieee80211_reset_erp_info(dev);
335                 ieee80211_enable_keys(sdata);
336
337                 if (sdata->vif.type == IEEE80211_IF_TYPE_STA &&
338                     !(sdata->flags & IEEE80211_SDATA_USERSPACE_MLME))
339                         netif_carrier_off(dev);
340                 else
341                         netif_carrier_on(dev);
342         }
343
344         if (sdata->vif.type == IEEE80211_IF_TYPE_WDS) {
345                 /* Create STA entry for the WDS peer */
346                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
347                                      GFP_KERNEL);
348                 if (!sta) {
349                         res = -ENOMEM;
350                         goto err_del_interface;
351                 }
352
353                 /* no locking required since STA is not live yet */
354                 sta->flags |= WLAN_STA_AUTHORIZED;
355
356                 res = sta_info_insert(sta);
357                 if (res) {
358                         /* STA has been freed */
359                         goto err_del_interface;
360                 }
361         }
362
363         if (local->open_count == 0) {
364                 res = dev_open(local->mdev);
365                 WARN_ON(res);
366                 if (res)
367                         goto err_del_interface;
368                 tasklet_enable(&local->tx_pending_tasklet);
369                 tasklet_enable(&local->tasklet);
370         }
371
372         /*
373          * set_multicast_list will be invoked by the networking core
374          * which will check whether any increments here were done in
375          * error and sync them down to the hardware as filter flags.
376          */
377         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
378                 atomic_inc(&local->iff_allmultis);
379
380         if (sdata->flags & IEEE80211_SDATA_PROMISC)
381                 atomic_inc(&local->iff_promiscs);
382
383         local->open_count++;
384         if (need_hw_reconfig)
385                 ieee80211_hw_config(local);
386
387         /*
388          * ieee80211_sta_work is disabled while network interface
389          * is down. Therefore, some configuration changes may not
390          * yet be effective. Trigger execution of ieee80211_sta_work
391          * to fix this.
392          */
393         if (sdata->vif.type == IEEE80211_IF_TYPE_STA ||
394             sdata->vif.type == IEEE80211_IF_TYPE_IBSS) {
395                 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
396                 queue_work(local->hw.workqueue, &ifsta->work);
397         }
398
399         netif_start_queue(dev);
400
401         return 0;
402  err_del_interface:
403         local->ops->remove_interface(local_to_hw(local), &conf);
404  err_stop:
405         if (!local->open_count && local->ops->stop)
406                 local->ops->stop(local_to_hw(local));
407         return res;
408 }
409
410 static int ieee80211_stop(struct net_device *dev)
411 {
412         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
413         struct ieee80211_local *local = sdata->local;
414         struct ieee80211_if_init_conf conf;
415         struct sta_info *sta;
416
417         /*
418          * Stop TX on this interface first.
419          */
420         netif_stop_queue(dev);
421
422         /*
423          * Now delete all active aggregation sessions.
424          */
425         rcu_read_lock();
426
427         list_for_each_entry_rcu(sta, &local->sta_list, list) {
428                 if (sta->sdata == sdata)
429                         ieee80211_sta_tear_down_BA_sessions(dev, sta->addr);
430         }
431
432         rcu_read_unlock();
433
434         /*
435          * Remove all stations associated with this interface.
436          *
437          * This must be done before calling ops->remove_interface()
438          * because otherwise we can later invoke ops->sta_notify()
439          * whenever the STAs are removed, and that invalidates driver
440          * assumptions about always getting a vif pointer that is valid
441          * (because if we remove a STA after ops->remove_interface()
442          * the driver will have removed the vif info already!)
443          *
444          * We could relax this and only unlink the stations from the
445          * hash table and list but keep them on a per-sdata list that
446          * will be inserted back again when the interface is brought
447          * up again, but I don't currently see a use case for that,
448          * except with WDS which gets a STA entry created when it is
449          * brought up.
450          */
451         sta_info_flush(local, sdata);
452
453         /*
454          * Don't count this interface for promisc/allmulti while it
455          * is down. dev_mc_unsync() will invoke set_multicast_list
456          * on the master interface which will sync these down to the
457          * hardware as filter flags.
458          */
459         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
460                 atomic_dec(&local->iff_allmultis);
461
462         if (sdata->flags & IEEE80211_SDATA_PROMISC)
463                 atomic_dec(&local->iff_promiscs);
464
465         dev_mc_unsync(local->mdev, dev);
466
467         /* APs need special treatment */
468         if (sdata->vif.type == IEEE80211_IF_TYPE_AP) {
469                 struct ieee80211_sub_if_data *vlan, *tmp;
470                 struct beacon_data *old_beacon = sdata->u.ap.beacon;
471
472                 /* remove beacon */
473                 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
474                 synchronize_rcu();
475                 kfree(old_beacon);
476
477                 /* down all dependent devices, that is VLANs */
478                 list_for_each_entry_safe(vlan, tmp, &sdata->u.ap.vlans,
479                                          u.vlan.list)
480                         dev_close(vlan->dev);
481                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
482         }
483
484         local->open_count--;
485
486         switch (sdata->vif.type) {
487         case IEEE80211_IF_TYPE_VLAN:
488                 list_del(&sdata->u.vlan.list);
489                 sdata->u.vlan.ap = NULL;
490                 /* no need to tell driver */
491                 break;
492         case IEEE80211_IF_TYPE_MNTR:
493                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
494                         local->cooked_mntrs--;
495                         break;
496                 }
497
498                 local->monitors--;
499                 if (local->monitors == 0)
500                         local->hw.conf.flags &= ~IEEE80211_CONF_RADIOTAP;
501
502                 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
503                         local->fif_fcsfail--;
504                 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
505                         local->fif_plcpfail--;
506                 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL)
507                         local->fif_control--;
508                 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
509                         local->fif_other_bss--;
510
511                 netif_tx_lock_bh(local->mdev);
512                 ieee80211_configure_filter(local);
513                 netif_tx_unlock_bh(local->mdev);
514                 break;
515         case IEEE80211_IF_TYPE_MESH_POINT:
516         case IEEE80211_IF_TYPE_STA:
517         case IEEE80211_IF_TYPE_IBSS:
518                 sdata->u.sta.state = IEEE80211_DISABLED;
519                 del_timer_sync(&sdata->u.sta.timer);
520                 /*
521                  * When we get here, the interface is marked down.
522                  * Call synchronize_rcu() to wait for the RX path
523                  * should it be using the interface and enqueuing
524                  * frames at this very time on another CPU.
525                  */
526                 synchronize_rcu();
527                 skb_queue_purge(&sdata->u.sta.skb_queue);
528
529                 if (local->scan_dev == sdata->dev) {
530                         if (!local->ops->hw_scan) {
531                                 local->sta_sw_scanning = 0;
532                                 cancel_delayed_work(&local->scan_work);
533                         } else
534                                 local->sta_hw_scanning = 0;
535                 }
536
537                 flush_workqueue(local->hw.workqueue);
538
539                 sdata->u.sta.flags &= ~IEEE80211_STA_PRIVACY_INVOKED;
540                 kfree(sdata->u.sta.extra_ie);
541                 sdata->u.sta.extra_ie = NULL;
542                 sdata->u.sta.extra_ie_len = 0;
543                 /* fall through */
544         default:
545                 conf.vif = &sdata->vif;
546                 conf.type = sdata->vif.type;
547                 conf.mac_addr = dev->dev_addr;
548                 /* disable all keys for as long as this netdev is down */
549                 ieee80211_disable_keys(sdata);
550                 local->ops->remove_interface(local_to_hw(local), &conf);
551         }
552
553         if (local->open_count == 0) {
554                 if (netif_running(local->mdev))
555                         dev_close(local->mdev);
556
557                 if (local->ops->stop)
558                         local->ops->stop(local_to_hw(local));
559
560                 ieee80211_led_radio(local, 0);
561
562                 tasklet_disable(&local->tx_pending_tasklet);
563                 tasklet_disable(&local->tasklet);
564         }
565
566         return 0;
567 }
568
569 int ieee80211_start_tx_ba_session(struct ieee80211_hw *hw, u8 *ra, u16 tid)
570 {
571         struct ieee80211_local *local = hw_to_local(hw);
572         struct sta_info *sta;
573         struct ieee80211_sub_if_data *sdata;
574         u16 start_seq_num = 0;
575         u8 *state;
576         int ret;
577         DECLARE_MAC_BUF(mac);
578
579         if (tid >= STA_TID_NUM)
580                 return -EINVAL;
581
582 #ifdef CONFIG_MAC80211_HT_DEBUG
583         printk(KERN_DEBUG "Open BA session requested for %s tid %u\n",
584                                 print_mac(mac, ra), tid);
585 #endif /* CONFIG_MAC80211_HT_DEBUG */
586
587         rcu_read_lock();
588
589         sta = sta_info_get(local, ra);
590         if (!sta) {
591                 printk(KERN_DEBUG "Could not find the station\n");
592                 rcu_read_unlock();
593                 return -ENOENT;
594         }
595
596         spin_lock_bh(&sta->lock);
597
598         /* we have tried too many times, receiver does not want A-MPDU */
599         if (sta->ampdu_mlme.addba_req_num[tid] > HT_AGG_MAX_RETRIES) {
600                 ret = -EBUSY;
601                 goto start_ba_exit;
602         }
603
604         state = &sta->ampdu_mlme.tid_state_tx[tid];
605         /* check if the TID is not in aggregation flow already */
606         if (*state != HT_AGG_STATE_IDLE) {
607 #ifdef CONFIG_MAC80211_HT_DEBUG
608                 printk(KERN_DEBUG "BA request denied - session is not "
609                                  "idle on tid %u\n", tid);
610 #endif /* CONFIG_MAC80211_HT_DEBUG */
611                 ret = -EAGAIN;
612                 goto start_ba_exit;
613         }
614
615         /* prepare A-MPDU MLME for Tx aggregation */
616         sta->ampdu_mlme.tid_tx[tid] =
617                         kmalloc(sizeof(struct tid_ampdu_tx), GFP_ATOMIC);
618         if (!sta->ampdu_mlme.tid_tx[tid]) {
619                 if (net_ratelimit())
620                         printk(KERN_ERR "allocate tx mlme to tid %d failed\n",
621                                         tid);
622                 ret = -ENOMEM;
623                 goto start_ba_exit;
624         }
625         /* Tx timer */
626         sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.function =
627                         sta_addba_resp_timer_expired;
628         sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.data =
629                         (unsigned long)&sta->timer_to_tid[tid];
630         init_timer(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer);
631
632         /* ensure that TX flow won't interrupt us
633          * until the end of the call to requeue function */
634         spin_lock_bh(&local->mdev->queue_lock);
635
636         /* create a new queue for this aggregation */
637         ret = ieee80211_ht_agg_queue_add(local, sta, tid);
638
639         /* case no queue is available to aggregation
640          * don't switch to aggregation */
641         if (ret) {
642 #ifdef CONFIG_MAC80211_HT_DEBUG
643                 printk(KERN_DEBUG "BA request denied - queue unavailable for"
644                                         " tid %d\n", tid);
645 #endif /* CONFIG_MAC80211_HT_DEBUG */
646                 goto start_ba_err;
647         }
648         sdata = sta->sdata;
649
650         /* Ok, the Addba frame hasn't been sent yet, but if the driver calls the
651          * call back right away, it must see that the flow has begun */
652         *state |= HT_ADDBA_REQUESTED_MSK;
653
654         if (local->ops->ampdu_action)
655                 ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_TX_START,
656                                                 ra, tid, &start_seq_num);
657
658         if (ret) {
659                 /* No need to requeue the packets in the agg queue, since we
660                  * held the tx lock: no packet could be enqueued to the newly
661                  * allocated queue */
662                  ieee80211_ht_agg_queue_remove(local, sta, tid, 0);
663 #ifdef CONFIG_MAC80211_HT_DEBUG
664                 printk(KERN_DEBUG "BA request denied - HW unavailable for"
665                                         " tid %d\n", tid);
666 #endif /* CONFIG_MAC80211_HT_DEBUG */
667                 *state = HT_AGG_STATE_IDLE;
668                 goto start_ba_err;
669         }
670
671         /* Will put all the packets in the new SW queue */
672         ieee80211_requeue(local, ieee802_1d_to_ac[tid]);
673         spin_unlock_bh(&local->mdev->queue_lock);
674
675         /* send an addBA request */
676         sta->ampdu_mlme.dialog_token_allocator++;
677         sta->ampdu_mlme.tid_tx[tid]->dialog_token =
678                         sta->ampdu_mlme.dialog_token_allocator;
679         sta->ampdu_mlme.tid_tx[tid]->ssn = start_seq_num;
680
681         ieee80211_send_addba_request(sta->sdata->dev, ra, tid,
682                          sta->ampdu_mlme.tid_tx[tid]->dialog_token,
683                          sta->ampdu_mlme.tid_tx[tid]->ssn,
684                          0x40, 5000);
685
686         /* activate the timer for the recipient's addBA response */
687         sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.expires =
688                                 jiffies + ADDBA_RESP_INTERVAL;
689         add_timer(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer);
690         printk(KERN_DEBUG "activated addBA response timer on tid %d\n", tid);
691         goto start_ba_exit;
692
693 start_ba_err:
694         kfree(sta->ampdu_mlme.tid_tx[tid]);
695         sta->ampdu_mlme.tid_tx[tid] = NULL;
696         spin_unlock_bh(&local->mdev->queue_lock);
697         ret = -EBUSY;
698 start_ba_exit:
699         spin_unlock_bh(&sta->lock);
700         rcu_read_unlock();
701         return ret;
702 }
703 EXPORT_SYMBOL(ieee80211_start_tx_ba_session);
704
705 int ieee80211_stop_tx_ba_session(struct ieee80211_hw *hw,
706                                  u8 *ra, u16 tid,
707                                  enum ieee80211_back_parties initiator)
708 {
709         struct ieee80211_local *local = hw_to_local(hw);
710         struct sta_info *sta;
711         u8 *state;
712         int ret = 0;
713         DECLARE_MAC_BUF(mac);
714
715         if (tid >= STA_TID_NUM)
716                 return -EINVAL;
717
718         rcu_read_lock();
719         sta = sta_info_get(local, ra);
720         if (!sta) {
721                 rcu_read_unlock();
722                 return -ENOENT;
723         }
724
725         /* check if the TID is in aggregation */
726         state = &sta->ampdu_mlme.tid_state_tx[tid];
727         spin_lock_bh(&sta->lock);
728
729         if (*state != HT_AGG_STATE_OPERATIONAL) {
730                 ret = -ENOENT;
731                 goto stop_BA_exit;
732         }
733
734 #ifdef CONFIG_MAC80211_HT_DEBUG
735         printk(KERN_DEBUG "Tx BA session stop requested for %s tid %u\n",
736                                 print_mac(mac, ra), tid);
737 #endif /* CONFIG_MAC80211_HT_DEBUG */
738
739         ieee80211_stop_queue(hw, sta->tid_to_tx_q[tid]);
740
741         *state = HT_AGG_STATE_REQ_STOP_BA_MSK |
742                 (initiator << HT_AGG_STATE_INITIATOR_SHIFT);
743
744         if (local->ops->ampdu_action)
745                 ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_TX_STOP,
746                                                 ra, tid, NULL);
747
748         /* case HW denied going back to legacy */
749         if (ret) {
750                 WARN_ON(ret != -EBUSY);
751                 *state = HT_AGG_STATE_OPERATIONAL;
752                 ieee80211_wake_queue(hw, sta->tid_to_tx_q[tid]);
753                 goto stop_BA_exit;
754         }
755
756 stop_BA_exit:
757         spin_unlock_bh(&sta->lock);
758         rcu_read_unlock();
759         return ret;
760 }
761 EXPORT_SYMBOL(ieee80211_stop_tx_ba_session);
762
763 void ieee80211_start_tx_ba_cb(struct ieee80211_hw *hw, u8 *ra, u16 tid)
764 {
765         struct ieee80211_local *local = hw_to_local(hw);
766         struct sta_info *sta;
767         u8 *state;
768         DECLARE_MAC_BUF(mac);
769
770         if (tid >= STA_TID_NUM) {
771                 printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n",
772                                 tid, STA_TID_NUM);
773                 return;
774         }
775
776         rcu_read_lock();
777         sta = sta_info_get(local, ra);
778         if (!sta) {
779                 rcu_read_unlock();
780                 printk(KERN_DEBUG "Could not find station: %s\n",
781                                 print_mac(mac, ra));
782                 return;
783         }
784
785         state = &sta->ampdu_mlme.tid_state_tx[tid];
786         spin_lock_bh(&sta->lock);
787
788         if (!(*state & HT_ADDBA_REQUESTED_MSK)) {
789                 printk(KERN_DEBUG "addBA was not requested yet, state is %d\n",
790                                 *state);
791                 spin_unlock_bh(&sta->lock);
792                 rcu_read_unlock();
793                 return;
794         }
795
796         WARN_ON_ONCE(*state & HT_ADDBA_DRV_READY_MSK);
797
798         *state |= HT_ADDBA_DRV_READY_MSK;
799
800         if (*state == HT_AGG_STATE_OPERATIONAL) {
801                 printk(KERN_DEBUG "Aggregation is on for tid %d \n", tid);
802                 ieee80211_wake_queue(hw, sta->tid_to_tx_q[tid]);
803         }
804         spin_unlock_bh(&sta->lock);
805         rcu_read_unlock();
806 }
807 EXPORT_SYMBOL(ieee80211_start_tx_ba_cb);
808
809 void ieee80211_stop_tx_ba_cb(struct ieee80211_hw *hw, u8 *ra, u8 tid)
810 {
811         struct ieee80211_local *local = hw_to_local(hw);
812         struct sta_info *sta;
813         u8 *state;
814         int agg_queue;
815         DECLARE_MAC_BUF(mac);
816
817         if (tid >= STA_TID_NUM) {
818                 printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n",
819                                 tid, STA_TID_NUM);
820                 return;
821         }
822
823 #ifdef CONFIG_MAC80211_HT_DEBUG
824         printk(KERN_DEBUG "Stopping Tx BA session for %s tid %d\n",
825                                 print_mac(mac, ra), tid);
826 #endif /* CONFIG_MAC80211_HT_DEBUG */
827
828         rcu_read_lock();
829         sta = sta_info_get(local, ra);
830         if (!sta) {
831                 printk(KERN_DEBUG "Could not find station: %s\n",
832                                 print_mac(mac, ra));
833                 rcu_read_unlock();
834                 return;
835         }
836         state = &sta->ampdu_mlme.tid_state_tx[tid];
837
838         spin_lock_bh(&sta->lock);
839         if ((*state & HT_AGG_STATE_REQ_STOP_BA_MSK) == 0) {
840                 printk(KERN_DEBUG "unexpected callback to A-MPDU stop\n");
841                 spin_unlock_bh(&sta->lock);
842                 rcu_read_unlock();
843                 return;
844         }
845
846         if (*state & HT_AGG_STATE_INITIATOR_MSK)
847                 ieee80211_send_delba(sta->sdata->dev, ra, tid,
848                         WLAN_BACK_INITIATOR, WLAN_REASON_QSTA_NOT_USE);
849
850         agg_queue = sta->tid_to_tx_q[tid];
851
852         /* avoid ordering issues: we are the only one that can modify
853          * the content of the qdiscs */
854         spin_lock_bh(&local->mdev->queue_lock);
855         /* remove the queue for this aggregation */
856         ieee80211_ht_agg_queue_remove(local, sta, tid, 1);
857         spin_unlock_bh(&local->mdev->queue_lock);
858
859         /* we just requeued the all the frames that were in the removed
860          * queue, and since we might miss a softirq we do netif_schedule.
861          * ieee80211_wake_queue is not used here as this queue is not
862          * necessarily stopped */
863         netif_schedule(local->mdev);
864         *state = HT_AGG_STATE_IDLE;
865         sta->ampdu_mlme.addba_req_num[tid] = 0;
866         kfree(sta->ampdu_mlme.tid_tx[tid]);
867         sta->ampdu_mlme.tid_tx[tid] = NULL;
868         spin_unlock_bh(&sta->lock);
869
870         rcu_read_unlock();
871 }
872 EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb);
873
874 void ieee80211_start_tx_ba_cb_irqsafe(struct ieee80211_hw *hw,
875                                       const u8 *ra, u16 tid)
876 {
877         struct ieee80211_local *local = hw_to_local(hw);
878         struct ieee80211_ra_tid *ra_tid;
879         struct sk_buff *skb = dev_alloc_skb(0);
880
881         if (unlikely(!skb)) {
882                 if (net_ratelimit())
883                         printk(KERN_WARNING "%s: Not enough memory, "
884                                "dropping start BA session", skb->dev->name);
885                 return;
886         }
887         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
888         memcpy(&ra_tid->ra, ra, ETH_ALEN);
889         ra_tid->tid = tid;
890
891         skb->pkt_type = IEEE80211_ADDBA_MSG;
892         skb_queue_tail(&local->skb_queue, skb);
893         tasklet_schedule(&local->tasklet);
894 }
895 EXPORT_SYMBOL(ieee80211_start_tx_ba_cb_irqsafe);
896
897 void ieee80211_stop_tx_ba_cb_irqsafe(struct ieee80211_hw *hw,
898                                      const u8 *ra, u16 tid)
899 {
900         struct ieee80211_local *local = hw_to_local(hw);
901         struct ieee80211_ra_tid *ra_tid;
902         struct sk_buff *skb = dev_alloc_skb(0);
903
904         if (unlikely(!skb)) {
905                 if (net_ratelimit())
906                         printk(KERN_WARNING "%s: Not enough memory, "
907                                "dropping stop BA session", skb->dev->name);
908                 return;
909         }
910         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
911         memcpy(&ra_tid->ra, ra, ETH_ALEN);
912         ra_tid->tid = tid;
913
914         skb->pkt_type = IEEE80211_DELBA_MSG;
915         skb_queue_tail(&local->skb_queue, skb);
916         tasklet_schedule(&local->tasklet);
917 }
918 EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb_irqsafe);
919
920 static void ieee80211_set_multicast_list(struct net_device *dev)
921 {
922         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
923         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
924         int allmulti, promisc, sdata_allmulti, sdata_promisc;
925
926         allmulti = !!(dev->flags & IFF_ALLMULTI);
927         promisc = !!(dev->flags & IFF_PROMISC);
928         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
929         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
930
931         if (allmulti != sdata_allmulti) {
932                 if (dev->flags & IFF_ALLMULTI)
933                         atomic_inc(&local->iff_allmultis);
934                 else
935                         atomic_dec(&local->iff_allmultis);
936                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
937         }
938
939         if (promisc != sdata_promisc) {
940                 if (dev->flags & IFF_PROMISC)
941                         atomic_inc(&local->iff_promiscs);
942                 else
943                         atomic_dec(&local->iff_promiscs);
944                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
945         }
946
947         dev_mc_sync(local->mdev, dev);
948 }
949
950 static const struct header_ops ieee80211_header_ops = {
951         .create         = eth_header,
952         .parse          = header_parse_80211,
953         .rebuild        = eth_rebuild_header,
954         .cache          = eth_header_cache,
955         .cache_update   = eth_header_cache_update,
956 };
957
958 /* Must not be called for mdev */
959 void ieee80211_if_setup(struct net_device *dev)
960 {
961         ether_setup(dev);
962         dev->hard_start_xmit = ieee80211_subif_start_xmit;
963         dev->wireless_handlers = &ieee80211_iw_handler_def;
964         dev->set_multicast_list = ieee80211_set_multicast_list;
965         dev->change_mtu = ieee80211_change_mtu;
966         dev->open = ieee80211_open;
967         dev->stop = ieee80211_stop;
968         dev->destructor = ieee80211_if_free;
969 }
970
971 /* everything else */
972
973 static int __ieee80211_if_config(struct net_device *dev,
974                                  struct sk_buff *beacon)
975 {
976         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
977         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
978         struct ieee80211_if_conf conf;
979
980         if (!local->ops->config_interface || !netif_running(dev))
981                 return 0;
982
983         memset(&conf, 0, sizeof(conf));
984         conf.type = sdata->vif.type;
985         if (sdata->vif.type == IEEE80211_IF_TYPE_STA ||
986             sdata->vif.type == IEEE80211_IF_TYPE_IBSS) {
987                 conf.bssid = sdata->u.sta.bssid;
988                 conf.ssid = sdata->u.sta.ssid;
989                 conf.ssid_len = sdata->u.sta.ssid_len;
990         } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
991                 conf.beacon = beacon;
992                 ieee80211_start_mesh(dev);
993         } else if (sdata->vif.type == IEEE80211_IF_TYPE_AP) {
994                 conf.ssid = sdata->u.ap.ssid;
995                 conf.ssid_len = sdata->u.ap.ssid_len;
996                 conf.beacon = beacon;
997         }
998         return local->ops->config_interface(local_to_hw(local),
999                                             &sdata->vif, &conf);
1000 }
1001
1002 int ieee80211_if_config(struct net_device *dev)
1003 {
1004         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1005         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1006         if (sdata->vif.type == IEEE80211_IF_TYPE_MESH_POINT &&
1007             (local->hw.flags & IEEE80211_HW_HOST_GEN_BEACON_TEMPLATE))
1008                 return ieee80211_if_config_beacon(dev);
1009         return __ieee80211_if_config(dev, NULL);
1010 }
1011
1012 int ieee80211_if_config_beacon(struct net_device *dev)
1013 {
1014         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1015         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1016         struct sk_buff *skb;
1017
1018         if (!(local->hw.flags & IEEE80211_HW_HOST_GEN_BEACON_TEMPLATE))
1019                 return 0;
1020         skb = ieee80211_beacon_get(local_to_hw(local), &sdata->vif);
1021         if (!skb)
1022                 return -ENOMEM;
1023         return __ieee80211_if_config(dev, skb);
1024 }
1025
1026 int ieee80211_hw_config(struct ieee80211_local *local)
1027 {
1028         struct ieee80211_channel *chan;
1029         int ret = 0;
1030
1031         if (local->sta_sw_scanning)
1032                 chan = local->scan_channel;
1033         else
1034                 chan = local->oper_channel;
1035
1036         local->hw.conf.channel = chan;
1037
1038         if (!local->hw.conf.power_level)
1039                 local->hw.conf.power_level = chan->max_power;
1040         else
1041                 local->hw.conf.power_level = min(chan->max_power,
1042                                                local->hw.conf.power_level);
1043
1044         local->hw.conf.max_antenna_gain = chan->max_antenna_gain;
1045
1046 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1047         printk(KERN_DEBUG "%s: HW CONFIG: freq=%d\n",
1048                wiphy_name(local->hw.wiphy), chan->center_freq);
1049 #endif
1050
1051         if (local->open_count)
1052                 ret = local->ops->config(local_to_hw(local), &local->hw.conf);
1053
1054         return ret;
1055 }
1056
1057 /**
1058  * ieee80211_handle_ht should be used only after legacy configuration
1059  * has been determined namely band, as ht configuration depends upon
1060  * the hardware's HT abilities for a _specific_ band.
1061  */
1062 u32 ieee80211_handle_ht(struct ieee80211_local *local, int enable_ht,
1063                            struct ieee80211_ht_info *req_ht_cap,
1064                            struct ieee80211_ht_bss_info *req_bss_cap)
1065 {
1066         struct ieee80211_conf *conf = &local->hw.conf;
1067         struct ieee80211_supported_band *sband;
1068         struct ieee80211_ht_info ht_conf;
1069         struct ieee80211_ht_bss_info ht_bss_conf;
1070         u32 changed = 0;
1071         int i;
1072         u8 max_tx_streams = IEEE80211_HT_CAP_MAX_STREAMS;
1073         u8 tx_mcs_set_cap;
1074
1075         sband = local->hw.wiphy->bands[conf->channel->band];
1076
1077         memset(&ht_conf, 0, sizeof(struct ieee80211_ht_info));
1078         memset(&ht_bss_conf, 0, sizeof(struct ieee80211_ht_bss_info));
1079
1080         /* HT is not supported */
1081         if (!sband->ht_info.ht_supported) {
1082                 conf->flags &= ~IEEE80211_CONF_SUPPORT_HT_MODE;
1083                 goto out;
1084         }
1085
1086         /* disable HT */
1087         if (!enable_ht) {
1088                 if (conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE)
1089                         changed |= BSS_CHANGED_HT;
1090                 conf->flags &= ~IEEE80211_CONF_SUPPORT_HT_MODE;
1091                 conf->ht_conf.ht_supported = 0;
1092                 goto out;
1093         }
1094
1095
1096         if (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE))
1097                 changed |= BSS_CHANGED_HT;
1098
1099         conf->flags |= IEEE80211_CONF_SUPPORT_HT_MODE;
1100         ht_conf.ht_supported = 1;
1101
1102         ht_conf.cap = req_ht_cap->cap & sband->ht_info.cap;
1103         ht_conf.cap &= ~(IEEE80211_HT_CAP_MIMO_PS);
1104         ht_conf.cap |= sband->ht_info.cap & IEEE80211_HT_CAP_MIMO_PS;
1105         ht_bss_conf.primary_channel = req_bss_cap->primary_channel;
1106         ht_bss_conf.bss_cap = req_bss_cap->bss_cap;
1107         ht_bss_conf.bss_op_mode = req_bss_cap->bss_op_mode;
1108
1109         ht_conf.ampdu_factor = req_ht_cap->ampdu_factor;
1110         ht_conf.ampdu_density = req_ht_cap->ampdu_density;
1111
1112         /* Bits 96-100 */
1113         tx_mcs_set_cap = sband->ht_info.supp_mcs_set[12];
1114
1115         /* configure suppoerted Tx MCS according to requested MCS
1116          * (based in most cases on Rx capabilities of peer) and self
1117          * Tx MCS capabilities (as defined by low level driver HW
1118          * Tx capabilities) */
1119         if (!(tx_mcs_set_cap & IEEE80211_HT_CAP_MCS_TX_DEFINED))
1120                 goto check_changed;
1121
1122         /* Counting from 0 therfore + 1 */
1123         if (tx_mcs_set_cap & IEEE80211_HT_CAP_MCS_TX_RX_DIFF)
1124                 max_tx_streams = ((tx_mcs_set_cap &
1125                                 IEEE80211_HT_CAP_MCS_TX_STREAMS) >> 2) + 1;
1126
1127         for (i = 0; i < max_tx_streams; i++)
1128                 ht_conf.supp_mcs_set[i] =
1129                         sband->ht_info.supp_mcs_set[i] &
1130                                         req_ht_cap->supp_mcs_set[i];
1131
1132         if (tx_mcs_set_cap & IEEE80211_HT_CAP_MCS_TX_UEQM)
1133                 for (i = IEEE80211_SUPP_MCS_SET_UEQM;
1134                      i < IEEE80211_SUPP_MCS_SET_LEN; i++)
1135                         ht_conf.supp_mcs_set[i] =
1136                                 sband->ht_info.supp_mcs_set[i] &
1137                                         req_ht_cap->supp_mcs_set[i];
1138
1139 check_changed:
1140         /* if bss configuration changed store the new one */
1141         if (memcmp(&conf->ht_conf, &ht_conf, sizeof(ht_conf)) ||
1142             memcmp(&conf->ht_bss_conf, &ht_bss_conf, sizeof(ht_bss_conf))) {
1143                 changed |= BSS_CHANGED_HT;
1144                 memcpy(&conf->ht_conf, &ht_conf, sizeof(ht_conf));
1145                 memcpy(&conf->ht_bss_conf, &ht_bss_conf, sizeof(ht_bss_conf));
1146         }
1147 out:
1148         return changed;
1149 }
1150
1151 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
1152                                       u32 changed)
1153 {
1154         struct ieee80211_local *local = sdata->local;
1155
1156         if (!changed)
1157                 return;
1158
1159         if (local->ops->bss_info_changed)
1160                 local->ops->bss_info_changed(local_to_hw(local),
1161                                              &sdata->vif,
1162                                              &sdata->bss_conf,
1163                                              changed);
1164 }
1165
1166 void ieee80211_reset_erp_info(struct net_device *dev)
1167 {
1168         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1169
1170         sdata->bss_conf.use_cts_prot = 0;
1171         sdata->bss_conf.use_short_preamble = 0;
1172         ieee80211_bss_info_change_notify(sdata,
1173                                          BSS_CHANGED_ERP_CTS_PROT |
1174                                          BSS_CHANGED_ERP_PREAMBLE);
1175 }
1176
1177 void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
1178                                  struct sk_buff *skb)
1179 {
1180         struct ieee80211_local *local = hw_to_local(hw);
1181         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1182         int tmp;
1183
1184         skb->dev = local->mdev;
1185         skb->pkt_type = IEEE80211_TX_STATUS_MSG;
1186         skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ?
1187                        &local->skb_queue : &local->skb_queue_unreliable, skb);
1188         tmp = skb_queue_len(&local->skb_queue) +
1189                 skb_queue_len(&local->skb_queue_unreliable);
1190         while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
1191                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
1192                 dev_kfree_skb_irq(skb);
1193                 tmp--;
1194                 I802_DEBUG_INC(local->tx_status_drop);
1195         }
1196         tasklet_schedule(&local->tasklet);
1197 }
1198 EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
1199
1200 static void ieee80211_tasklet_handler(unsigned long data)
1201 {
1202         struct ieee80211_local *local = (struct ieee80211_local *) data;
1203         struct sk_buff *skb;
1204         struct ieee80211_rx_status rx_status;
1205         struct ieee80211_ra_tid *ra_tid;
1206
1207         while ((skb = skb_dequeue(&local->skb_queue)) ||
1208                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
1209                 switch (skb->pkt_type) {
1210                 case IEEE80211_RX_MSG:
1211                         /* status is in skb->cb */
1212                         memcpy(&rx_status, skb->cb, sizeof(rx_status));
1213                         /* Clear skb->pkt_type in order to not confuse kernel
1214                          * netstack. */
1215                         skb->pkt_type = 0;
1216                         __ieee80211_rx(local_to_hw(local), skb, &rx_status);
1217                         break;
1218                 case IEEE80211_TX_STATUS_MSG:
1219                         skb->pkt_type = 0;
1220                         ieee80211_tx_status(local_to_hw(local), skb);
1221                         break;
1222                 case IEEE80211_DELBA_MSG:
1223                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
1224                         ieee80211_stop_tx_ba_cb(local_to_hw(local),
1225                                                 ra_tid->ra, ra_tid->tid);
1226                         dev_kfree_skb(skb);
1227                         break;
1228                 case IEEE80211_ADDBA_MSG:
1229                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
1230                         ieee80211_start_tx_ba_cb(local_to_hw(local),
1231                                                  ra_tid->ra, ra_tid->tid);
1232                         dev_kfree_skb(skb);
1233                         break ;
1234                 default: /* should never get here! */
1235                         printk(KERN_ERR "%s: Unknown message type (%d)\n",
1236                                wiphy_name(local->hw.wiphy), skb->pkt_type);
1237                         dev_kfree_skb(skb);
1238                         break;
1239                 }
1240         }
1241 }
1242
1243 /* Remove added headers (e.g., QoS control), encryption header/MIC, etc. to
1244  * make a prepared TX frame (one that has been given to hw) to look like brand
1245  * new IEEE 802.11 frame that is ready to go through TX processing again.
1246  * Also, tx_packet_data in cb is restored from tx_control. */
1247 static void ieee80211_remove_tx_extra(struct ieee80211_local *local,
1248                                       struct ieee80211_key *key,
1249                                       struct sk_buff *skb)
1250 {
1251         int hdrlen, iv_len, mic_len;
1252         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1253
1254         info->flags &=  IEEE80211_TX_CTL_REQ_TX_STATUS |
1255                         IEEE80211_TX_CTL_DO_NOT_ENCRYPT |
1256                         IEEE80211_TX_CTL_REQUEUE |
1257                         IEEE80211_TX_CTL_EAPOL_FRAME;
1258
1259         hdrlen = ieee80211_get_hdrlen_from_skb(skb);
1260
1261         if (!key)
1262                 goto no_key;
1263
1264         switch (key->conf.alg) {
1265         case ALG_WEP:
1266                 iv_len = WEP_IV_LEN;
1267                 mic_len = WEP_ICV_LEN;
1268                 break;
1269         case ALG_TKIP:
1270                 iv_len = TKIP_IV_LEN;
1271                 mic_len = TKIP_ICV_LEN;
1272                 break;
1273         case ALG_CCMP:
1274                 iv_len = CCMP_HDR_LEN;
1275                 mic_len = CCMP_MIC_LEN;
1276                 break;
1277         default:
1278                 goto no_key;
1279         }
1280
1281         if (skb->len >= mic_len &&
1282             !(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
1283                 skb_trim(skb, skb->len - mic_len);
1284         if (skb->len >= iv_len && skb->len > hdrlen) {
1285                 memmove(skb->data + iv_len, skb->data, hdrlen);
1286                 skb_pull(skb, iv_len);
1287         }
1288
1289 no_key:
1290         {
1291                 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1292                 u16 fc = le16_to_cpu(hdr->frame_control);
1293                 if ((fc & 0x8C) == 0x88) /* QoS Control Field */ {
1294                         fc &= ~IEEE80211_STYPE_QOS_DATA;
1295                         hdr->frame_control = cpu_to_le16(fc);
1296                         memmove(skb->data + 2, skb->data, hdrlen - 2);
1297                         skb_pull(skb, 2);
1298                 }
1299         }
1300 }
1301
1302 static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
1303                                             struct sta_info *sta,
1304                                             struct sk_buff *skb)
1305 {
1306         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1307
1308         sta->tx_filtered_count++;
1309
1310         /*
1311          * Clear the TX filter mask for this STA when sending the next
1312          * packet. If the STA went to power save mode, this will happen
1313          * happen when it wakes up for the next time.
1314          */
1315         set_sta_flags(sta, WLAN_STA_CLEAR_PS_FILT);
1316
1317         /*
1318          * This code races in the following way:
1319          *
1320          *  (1) STA sends frame indicating it will go to sleep and does so
1321          *  (2) hardware/firmware adds STA to filter list, passes frame up
1322          *  (3) hardware/firmware processes TX fifo and suppresses a frame
1323          *  (4) we get TX status before having processed the frame and
1324          *      knowing that the STA has gone to sleep.
1325          *
1326          * This is actually quite unlikely even when both those events are
1327          * processed from interrupts coming in quickly after one another or
1328          * even at the same time because we queue both TX status events and
1329          * RX frames to be processed by a tasklet and process them in the
1330          * same order that they were received or TX status last. Hence, there
1331          * is no race as long as the frame RX is processed before the next TX
1332          * status, which drivers can ensure, see below.
1333          *
1334          * Note that this can only happen if the hardware or firmware can
1335          * actually add STAs to the filter list, if this is done by the
1336          * driver in response to set_tim() (which will only reduce the race
1337          * this whole filtering tries to solve, not completely solve it)
1338          * this situation cannot happen.
1339          *
1340          * To completely solve this race drivers need to make sure that they
1341          *  (a) don't mix the irq-safe/not irq-safe TX status/RX processing
1342          *      functions and
1343          *  (b) always process RX events before TX status events if ordering
1344          *      can be unknown, for example with different interrupt status
1345          *      bits.
1346          */
1347         if (test_sta_flags(sta, WLAN_STA_PS) &&
1348             skb_queue_len(&sta->tx_filtered) < STA_MAX_TX_BUFFER) {
1349                 ieee80211_remove_tx_extra(local, sta->key, skb);
1350                 skb_queue_tail(&sta->tx_filtered, skb);
1351                 return;
1352         }
1353
1354         if (!test_sta_flags(sta, WLAN_STA_PS) &&
1355             !(info->flags & IEEE80211_TX_CTL_REQUEUE)) {
1356                 /* Software retry the packet once */
1357                 info->flags |= IEEE80211_TX_CTL_REQUEUE;
1358                 ieee80211_remove_tx_extra(local, sta->key, skb);
1359                 dev_queue_xmit(skb);
1360                 return;
1361         }
1362
1363         if (net_ratelimit())
1364                 printk(KERN_DEBUG "%s: dropped TX filtered frame, "
1365                        "queue_len=%d PS=%d @%lu\n",
1366                        wiphy_name(local->hw.wiphy),
1367                        skb_queue_len(&sta->tx_filtered),
1368                        !!test_sta_flags(sta, WLAN_STA_PS), jiffies);
1369         dev_kfree_skb(skb);
1370 }
1371
1372 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
1373 {
1374         struct sk_buff *skb2;
1375         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1376         struct ieee80211_local *local = hw_to_local(hw);
1377         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1378         u16 frag, type;
1379         struct ieee80211_tx_status_rtap_hdr *rthdr;
1380         struct ieee80211_sub_if_data *sdata;
1381         struct net_device *prev_dev = NULL;
1382
1383         rcu_read_lock();
1384
1385         if (info->status.excessive_retries) {
1386                 struct sta_info *sta;
1387                 sta = sta_info_get(local, hdr->addr1);
1388                 if (sta) {
1389                         if (test_sta_flags(sta, WLAN_STA_PS)) {
1390                                 /*
1391                                  * The STA is in power save mode, so assume
1392                                  * that this TX packet failed because of that.
1393                                  */
1394                                 ieee80211_handle_filtered_frame(local, sta, skb);
1395                                 rcu_read_unlock();
1396                                 return;
1397                         }
1398                 }
1399         }
1400
1401         if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
1402                 struct sta_info *sta;
1403                 sta = sta_info_get(local, hdr->addr1);
1404                 if (sta) {
1405                         ieee80211_handle_filtered_frame(local, sta, skb);
1406                         rcu_read_unlock();
1407                         return;
1408                 }
1409         } else
1410                 rate_control_tx_status(local->mdev, skb);
1411
1412         rcu_read_unlock();
1413
1414         ieee80211_led_tx(local, 0);
1415
1416         /* SNMP counters
1417          * Fragments are passed to low-level drivers as separate skbs, so these
1418          * are actually fragments, not frames. Update frame counters only for
1419          * the first fragment of the frame. */
1420
1421         frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG;
1422         type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE;
1423
1424         if (info->flags & IEEE80211_TX_STAT_ACK) {
1425                 if (frag == 0) {
1426                         local->dot11TransmittedFrameCount++;
1427                         if (is_multicast_ether_addr(hdr->addr1))
1428                                 local->dot11MulticastTransmittedFrameCount++;
1429                         if (info->status.retry_count > 0)
1430                                 local->dot11RetryCount++;
1431                         if (info->status.retry_count > 1)
1432                                 local->dot11MultipleRetryCount++;
1433                 }
1434
1435                 /* This counter shall be incremented for an acknowledged MPDU
1436                  * with an individual address in the address 1 field or an MPDU
1437                  * with a multicast address in the address 1 field of type Data
1438                  * or Management. */
1439                 if (!is_multicast_ether_addr(hdr->addr1) ||
1440                     type == IEEE80211_FTYPE_DATA ||
1441                     type == IEEE80211_FTYPE_MGMT)
1442                         local->dot11TransmittedFragmentCount++;
1443         } else {
1444                 if (frag == 0)
1445                         local->dot11FailedCount++;
1446         }
1447
1448         /* this was a transmitted frame, but now we want to reuse it */
1449         skb_orphan(skb);
1450
1451         /*
1452          * This is a bit racy but we can avoid a lot of work
1453          * with this test...
1454          */
1455         if (!local->monitors && !local->cooked_mntrs) {
1456                 dev_kfree_skb(skb);
1457                 return;
1458         }
1459
1460         /* send frame to monitor interfaces now */
1461
1462         if (skb_headroom(skb) < sizeof(*rthdr)) {
1463                 printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
1464                 dev_kfree_skb(skb);
1465                 return;
1466         }
1467
1468         rthdr = (struct ieee80211_tx_status_rtap_hdr *)
1469                                 skb_push(skb, sizeof(*rthdr));
1470
1471         memset(rthdr, 0, sizeof(*rthdr));
1472         rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
1473         rthdr->hdr.it_present =
1474                 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
1475                             (1 << IEEE80211_RADIOTAP_DATA_RETRIES));
1476
1477         if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
1478             !is_multicast_ether_addr(hdr->addr1))
1479                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL);
1480
1481         if ((info->flags & IEEE80211_TX_CTL_USE_RTS_CTS) &&
1482             (info->flags & IEEE80211_TX_CTL_USE_CTS_PROTECT))
1483                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS);
1484         else if (info->flags & IEEE80211_TX_CTL_USE_RTS_CTS)
1485                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS);
1486
1487         rthdr->data_retries = info->status.retry_count;
1488
1489         /* XXX: is this sufficient for BPF? */
1490         skb_set_mac_header(skb, 0);
1491         skb->ip_summed = CHECKSUM_UNNECESSARY;
1492         skb->pkt_type = PACKET_OTHERHOST;
1493         skb->protocol = htons(ETH_P_802_2);
1494         memset(skb->cb, 0, sizeof(skb->cb));
1495
1496         rcu_read_lock();
1497         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
1498                 if (sdata->vif.type == IEEE80211_IF_TYPE_MNTR) {
1499                         if (!netif_running(sdata->dev))
1500                                 continue;
1501
1502                         if (prev_dev) {
1503                                 skb2 = skb_clone(skb, GFP_ATOMIC);
1504                                 if (skb2) {
1505                                         skb2->dev = prev_dev;
1506                                         netif_rx(skb2);
1507                                 }
1508                         }
1509
1510                         prev_dev = sdata->dev;
1511                 }
1512         }
1513         if (prev_dev) {
1514                 skb->dev = prev_dev;
1515                 netif_rx(skb);
1516                 skb = NULL;
1517         }
1518         rcu_read_unlock();
1519         dev_kfree_skb(skb);
1520 }
1521 EXPORT_SYMBOL(ieee80211_tx_status);
1522
1523 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
1524                                         const struct ieee80211_ops *ops)
1525 {
1526         struct ieee80211_local *local;
1527         int priv_size;
1528         struct wiphy *wiphy;
1529
1530         /* Ensure 32-byte alignment of our private data and hw private data.
1531          * We use the wiphy priv data for both our ieee80211_local and for
1532          * the driver's private data
1533          *
1534          * In memory it'll be like this:
1535          *
1536          * +-------------------------+
1537          * | struct wiphy           |
1538          * +-------------------------+
1539          * | struct ieee80211_local  |
1540          * +-------------------------+
1541          * | driver's private data   |
1542          * +-------------------------+
1543          *
1544          */
1545         priv_size = ((sizeof(struct ieee80211_local) +
1546                       NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST) +
1547                     priv_data_len;
1548
1549         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
1550
1551         if (!wiphy)
1552                 return NULL;
1553
1554         wiphy->privid = mac80211_wiphy_privid;
1555
1556         local = wiphy_priv(wiphy);
1557         local->hw.wiphy = wiphy;
1558
1559         local->hw.priv = (char *)local +
1560                          ((sizeof(struct ieee80211_local) +
1561                            NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);
1562
1563         BUG_ON(!ops->tx);
1564         BUG_ON(!ops->start);
1565         BUG_ON(!ops->stop);
1566         BUG_ON(!ops->config);
1567         BUG_ON(!ops->add_interface);
1568         BUG_ON(!ops->remove_interface);
1569         BUG_ON(!ops->configure_filter);
1570         local->ops = ops;
1571
1572         local->hw.queues = 1; /* default */
1573
1574         local->bridge_packets = 1;
1575
1576         local->rts_threshold = IEEE80211_MAX_RTS_THRESHOLD;
1577         local->fragmentation_threshold = IEEE80211_MAX_FRAG_THRESHOLD;
1578         local->short_retry_limit = 7;
1579         local->long_retry_limit = 4;
1580         local->hw.conf.radio_enabled = 1;
1581
1582         INIT_LIST_HEAD(&local->interfaces);
1583
1584         spin_lock_init(&local->key_lock);
1585
1586         INIT_DELAYED_WORK(&local->scan_work, ieee80211_sta_scan_work);
1587
1588         sta_info_init(local);
1589
1590         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
1591                      (unsigned long)local);
1592         tasklet_disable(&local->tx_pending_tasklet);
1593
1594         tasklet_init(&local->tasklet,
1595                      ieee80211_tasklet_handler,
1596                      (unsigned long) local);
1597         tasklet_disable(&local->tasklet);
1598
1599         skb_queue_head_init(&local->skb_queue);
1600         skb_queue_head_init(&local->skb_queue_unreliable);
1601
1602         return local_to_hw(local);
1603 }
1604 EXPORT_SYMBOL(ieee80211_alloc_hw);
1605
1606 int ieee80211_register_hw(struct ieee80211_hw *hw)
1607 {
1608         struct ieee80211_local *local = hw_to_local(hw);
1609         const char *name;
1610         int result;
1611         enum ieee80211_band band;
1612         struct net_device *mdev;
1613         struct ieee80211_sub_if_data *sdata;
1614
1615         /*
1616          * generic code guarantees at least one band,
1617          * set this very early because much code assumes
1618          * that hw.conf.channel is assigned
1619          */
1620         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1621                 struct ieee80211_supported_band *sband;
1622
1623                 sband = local->hw.wiphy->bands[band];
1624                 if (sband) {
1625                         /* init channel we're on */
1626                         local->hw.conf.channel =
1627                         local->oper_channel =
1628                         local->scan_channel = &sband->channels[0];
1629                         break;
1630                 }
1631         }
1632
1633         result = wiphy_register(local->hw.wiphy);
1634         if (result < 0)
1635                 return result;
1636
1637         /* for now, mdev needs sub_if_data :/ */
1638         mdev = alloc_netdev(sizeof(struct ieee80211_sub_if_data),
1639                             "wmaster%d", ether_setup);
1640         if (!mdev)
1641                 goto fail_mdev_alloc;
1642
1643         sdata = IEEE80211_DEV_TO_SUB_IF(mdev);
1644         mdev->ieee80211_ptr = &sdata->wdev;
1645         sdata->wdev.wiphy = local->hw.wiphy;
1646
1647         local->mdev = mdev;
1648
1649         ieee80211_rx_bss_list_init(mdev);
1650
1651         mdev->hard_start_xmit = ieee80211_master_start_xmit;
1652         mdev->open = ieee80211_master_open;
1653         mdev->stop = ieee80211_master_stop;
1654         mdev->type = ARPHRD_IEEE80211;
1655         mdev->header_ops = &ieee80211_header_ops;
1656         mdev->set_multicast_list = ieee80211_master_set_multicast_list;
1657
1658         sdata->vif.type = IEEE80211_IF_TYPE_AP;
1659         sdata->dev = mdev;
1660         sdata->local = local;
1661         sdata->u.ap.force_unicast_rateidx = -1;
1662         sdata->u.ap.max_ratectrl_rateidx = -1;
1663         ieee80211_if_sdata_init(sdata);
1664
1665         /* no RCU needed since we're still during init phase */
1666         list_add_tail(&sdata->list, &local->interfaces);
1667
1668         name = wiphy_dev(local->hw.wiphy)->driver->name;
1669         local->hw.workqueue = create_singlethread_workqueue(name);
1670         if (!local->hw.workqueue) {
1671                 result = -ENOMEM;
1672                 goto fail_workqueue;
1673         }
1674
1675         /*
1676          * The hardware needs headroom for sending the frame,
1677          * and we need some headroom for passing the frame to monitor
1678          * interfaces, but never both at the same time.
1679          */
1680         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
1681                                    sizeof(struct ieee80211_tx_status_rtap_hdr));
1682
1683         debugfs_hw_add(local);
1684
1685         local->hw.conf.beacon_int = 1000;
1686
1687         local->wstats_flags |= local->hw.flags & (IEEE80211_HW_SIGNAL_UNSPEC |
1688                                                   IEEE80211_HW_SIGNAL_DB |
1689                                                   IEEE80211_HW_SIGNAL_DBM) ?
1690                                IW_QUAL_QUAL_UPDATED : IW_QUAL_QUAL_INVALID;
1691         local->wstats_flags |= local->hw.flags & IEEE80211_HW_NOISE_DBM ?
1692                                IW_QUAL_NOISE_UPDATED : IW_QUAL_NOISE_INVALID;
1693         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
1694                 local->wstats_flags |= IW_QUAL_DBM;
1695
1696         result = sta_info_start(local);
1697         if (result < 0)
1698                 goto fail_sta_info;
1699
1700         rtnl_lock();
1701         result = dev_alloc_name(local->mdev, local->mdev->name);
1702         if (result < 0)
1703                 goto fail_dev;
1704
1705         memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1706         SET_NETDEV_DEV(local->mdev, wiphy_dev(local->hw.wiphy));
1707
1708         result = register_netdevice(local->mdev);
1709         if (result < 0)
1710                 goto fail_dev;
1711
1712         ieee80211_debugfs_add_netdev(IEEE80211_DEV_TO_SUB_IF(local->mdev));
1713         ieee80211_if_set_type(local->mdev, IEEE80211_IF_TYPE_AP);
1714
1715         result = ieee80211_init_rate_ctrl_alg(local,
1716                                               hw->rate_control_algorithm);
1717         if (result < 0) {
1718                 printk(KERN_DEBUG "%s: Failed to initialize rate control "
1719                        "algorithm\n", wiphy_name(local->hw.wiphy));
1720                 goto fail_rate;
1721         }
1722
1723         result = ieee80211_wep_init(local);
1724
1725         if (result < 0) {
1726                 printk(KERN_DEBUG "%s: Failed to initialize wep\n",
1727                        wiphy_name(local->hw.wiphy));
1728                 goto fail_wep;
1729         }
1730
1731         if (hw->queues > IEEE80211_MAX_QUEUES)
1732                 hw->queues = IEEE80211_MAX_QUEUES;
1733         if (hw->ampdu_queues > IEEE80211_MAX_AMPDU_QUEUES)
1734                 hw->ampdu_queues = IEEE80211_MAX_AMPDU_QUEUES;
1735
1736         ieee80211_install_qdisc(local->mdev);
1737
1738         /* add one default STA interface */
1739         result = ieee80211_if_add(local->mdev, "wlan%d", NULL,
1740                                   IEEE80211_IF_TYPE_STA, NULL);
1741         if (result)
1742                 printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
1743                        wiphy_name(local->hw.wiphy));
1744
1745         local->reg_state = IEEE80211_DEV_REGISTERED;
1746         rtnl_unlock();
1747
1748         ieee80211_led_init(local);
1749
1750         return 0;
1751
1752 fail_wep:
1753         rate_control_deinitialize(local);
1754 fail_rate:
1755         ieee80211_debugfs_remove_netdev(IEEE80211_DEV_TO_SUB_IF(local->mdev));
1756         unregister_netdevice(local->mdev);
1757         local->mdev = NULL;
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         if (local->mdev != NULL) {
1766                 ieee80211_if_free(local->mdev);
1767                 local->mdev = NULL;
1768         }
1769 fail_mdev_alloc:
1770         wiphy_unregister(local->hw.wiphy);
1771         return result;
1772 }
1773 EXPORT_SYMBOL(ieee80211_register_hw);
1774
1775 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
1776 {
1777         struct ieee80211_local *local = hw_to_local(hw);
1778         struct ieee80211_sub_if_data *sdata, *tmp;
1779
1780         tasklet_kill(&local->tx_pending_tasklet);
1781         tasklet_kill(&local->tasklet);
1782
1783         rtnl_lock();
1784
1785         BUG_ON(local->reg_state != IEEE80211_DEV_REGISTERED);
1786
1787         local->reg_state = IEEE80211_DEV_UNREGISTERED;
1788
1789         /*
1790          * At this point, interface list manipulations are fine
1791          * because the driver cannot be handing us frames any
1792          * more and the tasklet is killed.
1793          */
1794
1795         /*
1796          * First, we remove all non-master interfaces. Do this because they
1797          * may have bss pointer dependency on the master, and when we free
1798          * the master these would be freed as well, breaking our list
1799          * iteration completely.
1800          */
1801         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1802                 if (sdata->dev == local->mdev)
1803                         continue;
1804                 list_del(&sdata->list);
1805                 __ieee80211_if_del(local, sdata);
1806         }
1807
1808         /* then, finally, remove the master interface */
1809         __ieee80211_if_del(local, IEEE80211_DEV_TO_SUB_IF(local->mdev));
1810
1811         rtnl_unlock();
1812
1813         ieee80211_rx_bss_list_deinit(local->mdev);
1814         ieee80211_clear_tx_pending(local);
1815         sta_info_stop(local);
1816         rate_control_deinitialize(local);
1817         debugfs_hw_del(local);
1818
1819         if (skb_queue_len(&local->skb_queue)
1820                         || skb_queue_len(&local->skb_queue_unreliable))
1821                 printk(KERN_WARNING "%s: skb_queue not empty\n",
1822                        wiphy_name(local->hw.wiphy));
1823         skb_queue_purge(&local->skb_queue);
1824         skb_queue_purge(&local->skb_queue_unreliable);
1825
1826         destroy_workqueue(local->hw.workqueue);
1827         wiphy_unregister(local->hw.wiphy);
1828         ieee80211_wep_free(local);
1829         ieee80211_led_exit(local);
1830         ieee80211_if_free(local->mdev);
1831         local->mdev = NULL;
1832 }
1833 EXPORT_SYMBOL(ieee80211_unregister_hw);
1834
1835 void ieee80211_free_hw(struct ieee80211_hw *hw)
1836 {
1837         struct ieee80211_local *local = hw_to_local(hw);
1838
1839         wiphy_free(local->hw.wiphy);
1840 }
1841 EXPORT_SYMBOL(ieee80211_free_hw);
1842
1843 static int __init ieee80211_init(void)
1844 {
1845         struct sk_buff *skb;
1846         int ret;
1847
1848         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1849         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1850                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1851
1852         ret = rc80211_pid_init();
1853         if (ret)
1854                 goto out;
1855
1856         ret = ieee80211_wme_register();
1857         if (ret) {
1858                 printk(KERN_DEBUG "ieee80211_init: failed to "
1859                        "initialize WME (err=%d)\n", ret);
1860                 goto out_cleanup_pid;
1861         }
1862
1863         ieee80211_debugfs_netdev_init();
1864
1865         return 0;
1866
1867  out_cleanup_pid:
1868         rc80211_pid_exit();
1869  out:
1870         return ret;
1871 }
1872
1873 static void __exit ieee80211_exit(void)
1874 {
1875         rc80211_pid_exit();
1876
1877         /*
1878          * For key todo, it'll be empty by now but the work
1879          * might still be scheduled.
1880          */
1881         flush_scheduled_work();
1882
1883         if (mesh_allocated)
1884                 ieee80211s_stop();
1885
1886         ieee80211_wme_unregister();
1887         ieee80211_debugfs_netdev_exit();
1888 }
1889
1890
1891 subsys_initcall(ieee80211_init);
1892 module_exit(ieee80211_exit);
1893
1894 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1895 MODULE_LICENSE("GPL");