netdev: Add netdev->addr_list_lock protection.
[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 (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 (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                 return -EINVAL;
156         }
157
158 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
159         printk(KERN_DEBUG "%s: setting MTU %d\n", dev->name, new_mtu);
160 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
161         dev->mtu = new_mtu;
162         return 0;
163 }
164
165 static inline int identical_mac_addr_allowed(int type1, int type2)
166 {
167         return (type1 == IEEE80211_IF_TYPE_MNTR ||
168                 type2 == IEEE80211_IF_TYPE_MNTR ||
169                 (type1 == IEEE80211_IF_TYPE_AP &&
170                  type2 == IEEE80211_IF_TYPE_WDS) ||
171                 (type1 == IEEE80211_IF_TYPE_WDS &&
172                  (type2 == IEEE80211_IF_TYPE_WDS ||
173                   type2 == IEEE80211_IF_TYPE_AP)) ||
174                 (type1 == IEEE80211_IF_TYPE_AP &&
175                  type2 == IEEE80211_IF_TYPE_VLAN) ||
176                 (type1 == IEEE80211_IF_TYPE_VLAN &&
177                  (type2 == IEEE80211_IF_TYPE_AP ||
178                   type2 == IEEE80211_IF_TYPE_VLAN)));
179 }
180
181 static int ieee80211_open(struct net_device *dev)
182 {
183         struct ieee80211_sub_if_data *sdata, *nsdata;
184         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
185         struct sta_info *sta;
186         struct ieee80211_if_init_conf conf;
187         u32 changed = 0;
188         int res;
189         bool need_hw_reconfig = 0;
190
191         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
192
193         /* we hold the RTNL here so can safely walk the list */
194         list_for_each_entry(nsdata, &local->interfaces, list) {
195                 struct net_device *ndev = nsdata->dev;
196
197                 if (ndev != dev && netif_running(ndev)) {
198                         /*
199                          * Allow only a single IBSS interface to be up at any
200                          * time. This is restricted because beacon distribution
201                          * cannot work properly if both are in the same IBSS.
202                          *
203                          * To remove this restriction we'd have to disallow them
204                          * from setting the same SSID on different IBSS interfaces
205                          * belonging to the same hardware. Then, however, we're
206                          * faced with having to adopt two different TSF timers...
207                          */
208                         if (sdata->vif.type == IEEE80211_IF_TYPE_IBSS &&
209                             nsdata->vif.type == IEEE80211_IF_TYPE_IBSS)
210                                 return -EBUSY;
211
212                         /*
213                          * The remaining checks are only performed for interfaces
214                          * with the same MAC address.
215                          */
216                         if (compare_ether_addr(dev->dev_addr, ndev->dev_addr))
217                                 continue;
218
219                         /*
220                          * check whether it may have the same address
221                          */
222                         if (!identical_mac_addr_allowed(sdata->vif.type,
223                                                         nsdata->vif.type))
224                                 return -ENOTUNIQ;
225
226                         /*
227                          * can only add VLANs to enabled APs
228                          */
229                         if (sdata->vif.type == IEEE80211_IF_TYPE_VLAN &&
230                             nsdata->vif.type == IEEE80211_IF_TYPE_AP)
231                                 sdata->bss = &nsdata->u.ap;
232                 }
233         }
234
235         switch (sdata->vif.type) {
236         case IEEE80211_IF_TYPE_WDS:
237                 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
238                         return -ENOLINK;
239                 break;
240         case IEEE80211_IF_TYPE_VLAN:
241                 if (!sdata->bss)
242                         return -ENOLINK;
243                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
244                 break;
245         case IEEE80211_IF_TYPE_AP:
246                 sdata->bss = &sdata->u.ap;
247                 break;
248         case IEEE80211_IF_TYPE_STA:
249         case IEEE80211_IF_TYPE_MNTR:
250         case IEEE80211_IF_TYPE_IBSS:
251         case IEEE80211_IF_TYPE_MESH_POINT:
252                 /* no special treatment */
253                 break;
254         case IEEE80211_IF_TYPE_INVALID:
255                 /* cannot happen */
256                 WARN_ON(1);
257                 break;
258         }
259
260         if (local->open_count == 0) {
261                 res = 0;
262                 if (local->ops->start)
263                         res = local->ops->start(local_to_hw(local));
264                 if (res)
265                         goto err_del_bss;
266                 need_hw_reconfig = 1;
267                 ieee80211_led_radio(local, local->hw.conf.radio_enabled);
268         }
269
270         switch (sdata->vif.type) {
271         case IEEE80211_IF_TYPE_VLAN:
272                 /* no need to tell driver */
273                 break;
274         case IEEE80211_IF_TYPE_MNTR:
275                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
276                         local->cooked_mntrs++;
277                         break;
278                 }
279
280                 /* must be before the call to ieee80211_configure_filter */
281                 local->monitors++;
282                 if (local->monitors == 1)
283                         local->hw.conf.flags |= IEEE80211_CONF_RADIOTAP;
284
285                 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
286                         local->fif_fcsfail++;
287                 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
288                         local->fif_plcpfail++;
289                 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL)
290                         local->fif_control++;
291                 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
292                         local->fif_other_bss++;
293
294                 netif_tx_lock_bh(local->mdev);
295                 netif_addr_lock(local->mdev);
296                 ieee80211_configure_filter(local);
297                 netif_addr_unlock(local->mdev);
298                 netif_tx_unlock_bh(local->mdev);
299                 break;
300         case IEEE80211_IF_TYPE_STA:
301         case IEEE80211_IF_TYPE_IBSS:
302                 sdata->u.sta.flags &= ~IEEE80211_STA_PREV_BSSID_SET;
303                 /* fall through */
304         default:
305                 conf.vif = &sdata->vif;
306                 conf.type = sdata->vif.type;
307                 conf.mac_addr = dev->dev_addr;
308                 res = local->ops->add_interface(local_to_hw(local), &conf);
309                 if (res)
310                         goto err_stop;
311
312                 if (ieee80211_vif_is_mesh(&sdata->vif))
313                         ieee80211_start_mesh(sdata->dev);
314                 changed |= ieee80211_reset_erp_info(dev);
315                 ieee80211_bss_info_change_notify(sdata, changed);
316                 ieee80211_enable_keys(sdata);
317
318                 if (sdata->vif.type == IEEE80211_IF_TYPE_STA &&
319                     !(sdata->flags & IEEE80211_SDATA_USERSPACE_MLME))
320                         netif_carrier_off(dev);
321                 else
322                         netif_carrier_on(dev);
323         }
324
325         if (sdata->vif.type == IEEE80211_IF_TYPE_WDS) {
326                 /* Create STA entry for the WDS peer */
327                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
328                                      GFP_KERNEL);
329                 if (!sta) {
330                         res = -ENOMEM;
331                         goto err_del_interface;
332                 }
333
334                 /* no locking required since STA is not live yet */
335                 sta->flags |= WLAN_STA_AUTHORIZED;
336
337                 res = sta_info_insert(sta);
338                 if (res) {
339                         /* STA has been freed */
340                         goto err_del_interface;
341                 }
342         }
343
344         if (local->open_count == 0) {
345                 res = dev_open(local->mdev);
346                 WARN_ON(res);
347                 if (res)
348                         goto err_del_interface;
349                 tasklet_enable(&local->tx_pending_tasklet);
350                 tasklet_enable(&local->tasklet);
351         }
352
353         /*
354          * set_multicast_list will be invoked by the networking core
355          * which will check whether any increments here were done in
356          * error and sync them down to the hardware as filter flags.
357          */
358         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
359                 atomic_inc(&local->iff_allmultis);
360
361         if (sdata->flags & IEEE80211_SDATA_PROMISC)
362                 atomic_inc(&local->iff_promiscs);
363
364         local->open_count++;
365         if (need_hw_reconfig)
366                 ieee80211_hw_config(local);
367
368         /*
369          * ieee80211_sta_work is disabled while network interface
370          * is down. Therefore, some configuration changes may not
371          * yet be effective. Trigger execution of ieee80211_sta_work
372          * to fix this.
373          */
374         if (sdata->vif.type == IEEE80211_IF_TYPE_STA ||
375             sdata->vif.type == IEEE80211_IF_TYPE_IBSS) {
376                 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
377                 queue_work(local->hw.workqueue, &ifsta->work);
378         }
379
380         netif_start_queue(dev);
381
382         return 0;
383  err_del_interface:
384         local->ops->remove_interface(local_to_hw(local), &conf);
385  err_stop:
386         if (!local->open_count && local->ops->stop)
387                 local->ops->stop(local_to_hw(local));
388  err_del_bss:
389         sdata->bss = NULL;
390         if (sdata->vif.type == IEEE80211_IF_TYPE_VLAN)
391                 list_del(&sdata->u.vlan.list);
392         return res;
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                 /* no need to tell driver */
475                 break;
476         case IEEE80211_IF_TYPE_MNTR:
477                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
478                         local->cooked_mntrs--;
479                         break;
480                 }
481
482                 local->monitors--;
483                 if (local->monitors == 0)
484                         local->hw.conf.flags &= ~IEEE80211_CONF_RADIOTAP;
485
486                 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
487                         local->fif_fcsfail--;
488                 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
489                         local->fif_plcpfail--;
490                 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL)
491                         local->fif_control--;
492                 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
493                         local->fif_other_bss--;
494
495                 netif_tx_lock_bh(local->mdev);
496                 netif_addr_lock(local->mdev);
497                 ieee80211_configure_filter(local);
498                 netif_addr_unlock(local->mdev);
499                 netif_tx_unlock_bh(local->mdev);
500                 break;
501         case IEEE80211_IF_TYPE_MESH_POINT:
502         case IEEE80211_IF_TYPE_STA:
503         case IEEE80211_IF_TYPE_IBSS:
504                 sdata->u.sta.state = IEEE80211_DISABLED;
505                 memset(sdata->u.sta.bssid, 0, ETH_ALEN);
506                 del_timer_sync(&sdata->u.sta.timer);
507                 /*
508                  * When we get here, the interface is marked down.
509                  * Call synchronize_rcu() to wait for the RX path
510                  * should it be using the interface and enqueuing
511                  * frames at this very time on another CPU.
512                  */
513                 synchronize_rcu();
514                 skb_queue_purge(&sdata->u.sta.skb_queue);
515
516                 if (local->scan_dev == sdata->dev) {
517                         if (!local->ops->hw_scan) {
518                                 local->sta_sw_scanning = 0;
519                                 cancel_delayed_work(&local->scan_work);
520                         } else
521                                 local->sta_hw_scanning = 0;
522                 }
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         sdata->bss = NULL;
539
540         if (local->open_count == 0) {
541                 if (netif_running(local->mdev))
542                         dev_close(local->mdev);
543
544                 if (local->ops->stop)
545                         local->ops->stop(local_to_hw(local));
546
547                 ieee80211_led_radio(local, 0);
548
549                 flush_workqueue(local->hw.workqueue);
550
551                 tasklet_disable(&local->tx_pending_tasklet);
552                 tasklet_disable(&local->tasklet);
553         }
554
555         return 0;
556 }
557
558 int ieee80211_start_tx_ba_session(struct ieee80211_hw *hw, u8 *ra, u16 tid)
559 {
560         struct ieee80211_local *local = hw_to_local(hw);
561         struct netdev_queue *txq;
562         struct sta_info *sta;
563         struct ieee80211_sub_if_data *sdata;
564         u16 start_seq_num = 0;
565         u8 *state;
566         int ret;
567         DECLARE_MAC_BUF(mac);
568
569         if (tid >= STA_TID_NUM)
570                 return -EINVAL;
571
572 #ifdef CONFIG_MAC80211_HT_DEBUG
573         printk(KERN_DEBUG "Open BA session requested for %s tid %u\n",
574                                 print_mac(mac, ra), tid);
575 #endif /* CONFIG_MAC80211_HT_DEBUG */
576
577         rcu_read_lock();
578
579         sta = sta_info_get(local, ra);
580         if (!sta) {
581 #ifdef CONFIG_MAC80211_HT_DEBUG
582                 printk(KERN_DEBUG "Could not find the station\n");
583 #endif
584                 ret = -ENOENT;
585                 goto exit;
586         }
587
588         spin_lock_bh(&sta->lock);
589
590         /* we have tried too many times, receiver does not want A-MPDU */
591         if (sta->ampdu_mlme.addba_req_num[tid] > HT_AGG_MAX_RETRIES) {
592                 ret = -EBUSY;
593                 goto err_unlock_sta;
594         }
595
596         state = &sta->ampdu_mlme.tid_state_tx[tid];
597         /* check if the TID is not in aggregation flow already */
598         if (*state != HT_AGG_STATE_IDLE) {
599 #ifdef CONFIG_MAC80211_HT_DEBUG
600                 printk(KERN_DEBUG "BA request denied - session is not "
601                                  "idle on tid %u\n", tid);
602 #endif /* CONFIG_MAC80211_HT_DEBUG */
603                 ret = -EAGAIN;
604                 goto err_unlock_sta;
605         }
606
607         /* prepare A-MPDU MLME for Tx aggregation */
608         sta->ampdu_mlme.tid_tx[tid] =
609                         kmalloc(sizeof(struct tid_ampdu_tx), GFP_ATOMIC);
610         if (!sta->ampdu_mlme.tid_tx[tid]) {
611 #ifdef CONFIG_MAC80211_HT_DEBUG
612                 if (net_ratelimit())
613                         printk(KERN_ERR "allocate tx mlme to tid %d failed\n",
614                                         tid);
615 #endif
616                 ret = -ENOMEM;
617                 goto err_unlock_sta;
618         }
619         /* Tx timer */
620         sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.function =
621                         sta_addba_resp_timer_expired;
622         sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.data =
623                         (unsigned long)&sta->timer_to_tid[tid];
624         init_timer(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer);
625
626         /* ensure that TX flow won't interrupt us
627          * until the end of the call to requeue function */
628         txq = &local->mdev->tx_queue;
629         spin_lock_bh(&txq->lock);
630
631         /* create a new queue for this aggregation */
632         ret = ieee80211_ht_agg_queue_add(local, sta, tid);
633
634         /* case no queue is available to aggregation
635          * don't switch to aggregation */
636         if (ret) {
637 #ifdef CONFIG_MAC80211_HT_DEBUG
638                 printk(KERN_DEBUG "BA request denied - queue unavailable for"
639                                         " tid %d\n", tid);
640 #endif /* CONFIG_MAC80211_HT_DEBUG */
641                 goto err_unlock_queue;
642         }
643         sdata = sta->sdata;
644
645         /* Ok, the Addba frame hasn't been sent yet, but if the driver calls the
646          * call back right away, it must see that the flow has begun */
647         *state |= HT_ADDBA_REQUESTED_MSK;
648
649         if (local->ops->ampdu_action)
650                 ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_TX_START,
651                                                 ra, tid, &start_seq_num);
652
653         if (ret) {
654                 /* No need to requeue the packets in the agg queue, since we
655                  * held the tx lock: no packet could be enqueued to the newly
656                  * allocated queue */
657                  ieee80211_ht_agg_queue_remove(local, sta, tid, 0);
658 #ifdef CONFIG_MAC80211_HT_DEBUG
659                 printk(KERN_DEBUG "BA request denied - HW unavailable for"
660                                         " tid %d\n", tid);
661 #endif /* CONFIG_MAC80211_HT_DEBUG */
662                 *state = HT_AGG_STATE_IDLE;
663                 goto err_unlock_queue;
664         }
665
666         /* Will put all the packets in the new SW queue */
667         ieee80211_requeue(local, ieee802_1d_to_ac[tid]);
668         spin_unlock_bh(&txq->lock);
669         spin_unlock_bh(&sta->lock);
670
671         /* send an addBA request */
672         sta->ampdu_mlme.dialog_token_allocator++;
673         sta->ampdu_mlme.tid_tx[tid]->dialog_token =
674                         sta->ampdu_mlme.dialog_token_allocator;
675         sta->ampdu_mlme.tid_tx[tid]->ssn = start_seq_num;
676
677
678         ieee80211_send_addba_request(sta->sdata->dev, ra, tid,
679                          sta->ampdu_mlme.tid_tx[tid]->dialog_token,
680                          sta->ampdu_mlme.tid_tx[tid]->ssn,
681                          0x40, 5000);
682         /* activate the timer for the recipient's addBA response */
683         sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.expires =
684                                 jiffies + ADDBA_RESP_INTERVAL;
685         add_timer(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer);
686 #ifdef CONFIG_MAC80211_HT_DEBUG
687         printk(KERN_DEBUG "activated addBA response timer on tid %d\n", tid);
688 #endif
689         goto exit;
690
691 err_unlock_queue:
692         kfree(sta->ampdu_mlme.tid_tx[tid]);
693         sta->ampdu_mlme.tid_tx[tid] = NULL;
694         spin_unlock_bh(&txq->lock);
695         ret = -EBUSY;
696 err_unlock_sta:
697         spin_unlock_bh(&sta->lock);
698 exit:
699         rcu_read_unlock();
700         return ret;
701 }
702 EXPORT_SYMBOL(ieee80211_start_tx_ba_session);
703
704 int ieee80211_stop_tx_ba_session(struct ieee80211_hw *hw,
705                                  u8 *ra, u16 tid,
706                                  enum ieee80211_back_parties initiator)
707 {
708         struct ieee80211_local *local = hw_to_local(hw);
709         struct sta_info *sta;
710         u8 *state;
711         int ret = 0;
712         DECLARE_MAC_BUF(mac);
713
714         if (tid >= STA_TID_NUM)
715                 return -EINVAL;
716
717         rcu_read_lock();
718         sta = sta_info_get(local, ra);
719         if (!sta) {
720                 rcu_read_unlock();
721                 return -ENOENT;
722         }
723
724         /* check if the TID is in aggregation */
725         state = &sta->ampdu_mlme.tid_state_tx[tid];
726         spin_lock_bh(&sta->lock);
727
728         if (*state != HT_AGG_STATE_OPERATIONAL) {
729                 ret = -ENOENT;
730                 goto stop_BA_exit;
731         }
732
733 #ifdef CONFIG_MAC80211_HT_DEBUG
734         printk(KERN_DEBUG "Tx BA session stop requested for %s tid %u\n",
735                                 print_mac(mac, ra), tid);
736 #endif /* CONFIG_MAC80211_HT_DEBUG */
737
738         ieee80211_stop_queue(hw, sta->tid_to_tx_q[tid]);
739
740         *state = HT_AGG_STATE_REQ_STOP_BA_MSK |
741                 (initiator << HT_AGG_STATE_INITIATOR_SHIFT);
742
743         if (local->ops->ampdu_action)
744                 ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_TX_STOP,
745                                                 ra, tid, NULL);
746
747         /* case HW denied going back to legacy */
748         if (ret) {
749                 WARN_ON(ret != -EBUSY);
750                 *state = HT_AGG_STATE_OPERATIONAL;
751                 ieee80211_wake_queue(hw, sta->tid_to_tx_q[tid]);
752                 goto stop_BA_exit;
753         }
754
755 stop_BA_exit:
756         spin_unlock_bh(&sta->lock);
757         rcu_read_unlock();
758         return ret;
759 }
760 EXPORT_SYMBOL(ieee80211_stop_tx_ba_session);
761
762 void ieee80211_start_tx_ba_cb(struct ieee80211_hw *hw, u8 *ra, u16 tid)
763 {
764         struct ieee80211_local *local = hw_to_local(hw);
765         struct sta_info *sta;
766         u8 *state;
767         DECLARE_MAC_BUF(mac);
768
769         if (tid >= STA_TID_NUM) {
770 #ifdef CONFIG_MAC80211_HT_DEBUG
771                 printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n",
772                                 tid, STA_TID_NUM);
773 #endif
774                 return;
775         }
776
777         rcu_read_lock();
778         sta = sta_info_get(local, ra);
779         if (!sta) {
780                 rcu_read_unlock();
781 #ifdef CONFIG_MAC80211_HT_DEBUG
782                 printk(KERN_DEBUG "Could not find station: %s\n",
783                                 print_mac(mac, ra));
784 #endif
785                 return;
786         }
787
788         state = &sta->ampdu_mlme.tid_state_tx[tid];
789         spin_lock_bh(&sta->lock);
790
791         if (!(*state & HT_ADDBA_REQUESTED_MSK)) {
792 #ifdef CONFIG_MAC80211_HT_DEBUG
793                 printk(KERN_DEBUG "addBA was not requested yet, state is %d\n",
794                                 *state);
795 #endif
796                 spin_unlock_bh(&sta->lock);
797                 rcu_read_unlock();
798                 return;
799         }
800
801         WARN_ON_ONCE(*state & HT_ADDBA_DRV_READY_MSK);
802
803         *state |= HT_ADDBA_DRV_READY_MSK;
804
805         if (*state == HT_AGG_STATE_OPERATIONAL) {
806 #ifdef CONFIG_MAC80211_HT_DEBUG
807                 printk(KERN_DEBUG "Aggregation is on for tid %d \n", tid);
808 #endif
809                 ieee80211_wake_queue(hw, sta->tid_to_tx_q[tid]);
810         }
811         spin_unlock_bh(&sta->lock);
812         rcu_read_unlock();
813 }
814 EXPORT_SYMBOL(ieee80211_start_tx_ba_cb);
815
816 void ieee80211_stop_tx_ba_cb(struct ieee80211_hw *hw, u8 *ra, u8 tid)
817 {
818         struct ieee80211_local *local = hw_to_local(hw);
819         struct netdev_queue *txq;
820         struct sta_info *sta;
821         u8 *state;
822         int agg_queue;
823         DECLARE_MAC_BUF(mac);
824
825         if (tid >= STA_TID_NUM) {
826 #ifdef CONFIG_MAC80211_HT_DEBUG
827                 printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n",
828                                 tid, STA_TID_NUM);
829 #endif
830                 return;
831         }
832
833 #ifdef CONFIG_MAC80211_HT_DEBUG
834         printk(KERN_DEBUG "Stopping Tx BA session for %s tid %d\n",
835                                 print_mac(mac, ra), tid);
836 #endif /* CONFIG_MAC80211_HT_DEBUG */
837
838         rcu_read_lock();
839         sta = sta_info_get(local, ra);
840         if (!sta) {
841 #ifdef CONFIG_MAC80211_HT_DEBUG
842                 printk(KERN_DEBUG "Could not find station: %s\n",
843                                 print_mac(mac, ra));
844 #endif
845                 rcu_read_unlock();
846                 return;
847         }
848         state = &sta->ampdu_mlme.tid_state_tx[tid];
849
850         /* NOTE: no need to use sta->lock in this state check, as
851          * ieee80211_stop_tx_ba_session will let only
852          * one stop call to pass through per sta/tid */
853         if ((*state & HT_AGG_STATE_REQ_STOP_BA_MSK) == 0) {
854 #ifdef CONFIG_MAC80211_HT_DEBUG
855                 printk(KERN_DEBUG "unexpected callback to A-MPDU stop\n");
856 #endif
857                 rcu_read_unlock();
858                 return;
859         }
860
861         if (*state & HT_AGG_STATE_INITIATOR_MSK)
862                 ieee80211_send_delba(sta->sdata->dev, ra, tid,
863                         WLAN_BACK_INITIATOR, WLAN_REASON_QSTA_NOT_USE);
864
865         agg_queue = sta->tid_to_tx_q[tid];
866
867         /* avoid ordering issues: we are the only one that can modify
868          * the content of the qdiscs */
869         txq = &local->mdev->tx_queue;
870         spin_lock_bh(&txq->lock);
871         /* remove the queue for this aggregation */
872         ieee80211_ht_agg_queue_remove(local, sta, tid, 1);
873         spin_unlock_bh(&txq->lock);
874
875         /* we just requeued the all the frames that were in the removed
876          * queue, and since we might miss a softirq we do netif_schedule_queue.
877          * ieee80211_wake_queue is not used here as this queue is not
878          * necessarily stopped */
879         netif_schedule_queue(txq);
880         spin_lock_bh(&sta->lock);
881         *state = HT_AGG_STATE_IDLE;
882         sta->ampdu_mlme.addba_req_num[tid] = 0;
883         kfree(sta->ampdu_mlme.tid_tx[tid]);
884         sta->ampdu_mlme.tid_tx[tid] = NULL;
885         spin_unlock_bh(&sta->lock);
886
887         rcu_read_unlock();
888 }
889 EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb);
890
891 void ieee80211_start_tx_ba_cb_irqsafe(struct ieee80211_hw *hw,
892                                       const u8 *ra, u16 tid)
893 {
894         struct ieee80211_local *local = hw_to_local(hw);
895         struct ieee80211_ra_tid *ra_tid;
896         struct sk_buff *skb = dev_alloc_skb(0);
897
898         if (unlikely(!skb)) {
899 #ifdef CONFIG_MAC80211_HT_DEBUG
900                 if (net_ratelimit())
901                         printk(KERN_WARNING "%s: Not enough memory, "
902                                "dropping start BA session", skb->dev->name);
903 #endif
904                 return;
905         }
906         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
907         memcpy(&ra_tid->ra, ra, ETH_ALEN);
908         ra_tid->tid = tid;
909
910         skb->pkt_type = IEEE80211_ADDBA_MSG;
911         skb_queue_tail(&local->skb_queue, skb);
912         tasklet_schedule(&local->tasklet);
913 }
914 EXPORT_SYMBOL(ieee80211_start_tx_ba_cb_irqsafe);
915
916 void ieee80211_stop_tx_ba_cb_irqsafe(struct ieee80211_hw *hw,
917                                      const u8 *ra, u16 tid)
918 {
919         struct ieee80211_local *local = hw_to_local(hw);
920         struct ieee80211_ra_tid *ra_tid;
921         struct sk_buff *skb = dev_alloc_skb(0);
922
923         if (unlikely(!skb)) {
924 #ifdef CONFIG_MAC80211_HT_DEBUG
925                 if (net_ratelimit())
926                         printk(KERN_WARNING "%s: Not enough memory, "
927                                "dropping stop BA session", skb->dev->name);
928 #endif
929                 return;
930         }
931         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
932         memcpy(&ra_tid->ra, ra, ETH_ALEN);
933         ra_tid->tid = tid;
934
935         skb->pkt_type = IEEE80211_DELBA_MSG;
936         skb_queue_tail(&local->skb_queue, skb);
937         tasklet_schedule(&local->tasklet);
938 }
939 EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb_irqsafe);
940
941 static void ieee80211_set_multicast_list(struct net_device *dev)
942 {
943         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
944         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
945         int allmulti, promisc, sdata_allmulti, sdata_promisc;
946
947         allmulti = !!(dev->flags & IFF_ALLMULTI);
948         promisc = !!(dev->flags & IFF_PROMISC);
949         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
950         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
951
952         if (allmulti != sdata_allmulti) {
953                 if (dev->flags & IFF_ALLMULTI)
954                         atomic_inc(&local->iff_allmultis);
955                 else
956                         atomic_dec(&local->iff_allmultis);
957                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
958         }
959
960         if (promisc != sdata_promisc) {
961                 if (dev->flags & IFF_PROMISC)
962                         atomic_inc(&local->iff_promiscs);
963                 else
964                         atomic_dec(&local->iff_promiscs);
965                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
966         }
967
968         dev_mc_sync(local->mdev, dev);
969 }
970
971 static const struct header_ops ieee80211_header_ops = {
972         .create         = eth_header,
973         .parse          = header_parse_80211,
974         .rebuild        = eth_rebuild_header,
975         .cache          = eth_header_cache,
976         .cache_update   = eth_header_cache_update,
977 };
978
979 void ieee80211_if_setup(struct net_device *dev)
980 {
981         ether_setup(dev);
982         dev->hard_start_xmit = ieee80211_subif_start_xmit;
983         dev->wireless_handlers = &ieee80211_iw_handler_def;
984         dev->set_multicast_list = ieee80211_set_multicast_list;
985         dev->change_mtu = ieee80211_change_mtu;
986         dev->open = ieee80211_open;
987         dev->stop = ieee80211_stop;
988         dev->destructor = free_netdev;
989 }
990
991 /* everything else */
992
993 int ieee80211_if_config(struct ieee80211_sub_if_data *sdata, u32 changed)
994 {
995         struct ieee80211_local *local = sdata->local;
996         struct ieee80211_if_conf conf;
997
998         if (WARN_ON(!netif_running(sdata->dev)))
999                 return 0;
1000
1001         if (!local->ops->config_interface)
1002                 return 0;
1003
1004         memset(&conf, 0, sizeof(conf));
1005         conf.changed = changed;
1006
1007         if (sdata->vif.type == IEEE80211_IF_TYPE_STA ||
1008             sdata->vif.type == IEEE80211_IF_TYPE_IBSS) {
1009                 conf.bssid = sdata->u.sta.bssid;
1010                 conf.ssid = sdata->u.sta.ssid;
1011                 conf.ssid_len = sdata->u.sta.ssid_len;
1012         } else if (sdata->vif.type == IEEE80211_IF_TYPE_AP) {
1013                 conf.bssid = sdata->dev->dev_addr;
1014                 conf.ssid = sdata->u.ap.ssid;
1015                 conf.ssid_len = sdata->u.ap.ssid_len;
1016         } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
1017                 u8 zero[ETH_ALEN] = { 0 };
1018                 conf.bssid = zero;
1019                 conf.ssid = zero;
1020                 conf.ssid_len = 0;
1021         } else {
1022                 WARN_ON(1);
1023                 return -EINVAL;
1024         }
1025
1026         if (WARN_ON(!conf.bssid && (changed & IEEE80211_IFCC_BSSID)))
1027                 return -EINVAL;
1028
1029         if (WARN_ON(!conf.ssid && (changed & IEEE80211_IFCC_SSID)))
1030                 return -EINVAL;
1031
1032         return local->ops->config_interface(local_to_hw(local),
1033                                             &sdata->vif, &conf);
1034 }
1035
1036 int ieee80211_hw_config(struct ieee80211_local *local)
1037 {
1038         struct ieee80211_channel *chan;
1039         int ret = 0;
1040
1041         if (local->sta_sw_scanning)
1042                 chan = local->scan_channel;
1043         else
1044                 chan = local->oper_channel;
1045
1046         local->hw.conf.channel = chan;
1047
1048         if (!local->hw.conf.power_level)
1049                 local->hw.conf.power_level = chan->max_power;
1050         else
1051                 local->hw.conf.power_level = min(chan->max_power,
1052                                                local->hw.conf.power_level);
1053
1054         local->hw.conf.max_antenna_gain = chan->max_antenna_gain;
1055
1056 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1057         printk(KERN_DEBUG "%s: HW CONFIG: freq=%d\n",
1058                wiphy_name(local->hw.wiphy), chan->center_freq);
1059 #endif
1060
1061         if (local->open_count)
1062                 ret = local->ops->config(local_to_hw(local), &local->hw.conf);
1063
1064         return ret;
1065 }
1066
1067 /**
1068  * ieee80211_handle_ht should be used only after legacy configuration
1069  * has been determined namely band, as ht configuration depends upon
1070  * the hardware's HT abilities for a _specific_ band.
1071  */
1072 u32 ieee80211_handle_ht(struct ieee80211_local *local, int enable_ht,
1073                            struct ieee80211_ht_info *req_ht_cap,
1074                            struct ieee80211_ht_bss_info *req_bss_cap)
1075 {
1076         struct ieee80211_conf *conf = &local->hw.conf;
1077         struct ieee80211_supported_band *sband;
1078         struct ieee80211_ht_info ht_conf;
1079         struct ieee80211_ht_bss_info ht_bss_conf;
1080         u32 changed = 0;
1081         int i;
1082         u8 max_tx_streams = IEEE80211_HT_CAP_MAX_STREAMS;
1083         u8 tx_mcs_set_cap;
1084
1085         sband = local->hw.wiphy->bands[conf->channel->band];
1086
1087         memset(&ht_conf, 0, sizeof(struct ieee80211_ht_info));
1088         memset(&ht_bss_conf, 0, sizeof(struct ieee80211_ht_bss_info));
1089
1090         /* HT is not supported */
1091         if (!sband->ht_info.ht_supported) {
1092                 conf->flags &= ~IEEE80211_CONF_SUPPORT_HT_MODE;
1093                 goto out;
1094         }
1095
1096         /* disable HT */
1097         if (!enable_ht) {
1098                 if (conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE)
1099                         changed |= BSS_CHANGED_HT;
1100                 conf->flags &= ~IEEE80211_CONF_SUPPORT_HT_MODE;
1101                 conf->ht_conf.ht_supported = 0;
1102                 goto out;
1103         }
1104
1105
1106         if (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE))
1107                 changed |= BSS_CHANGED_HT;
1108
1109         conf->flags |= IEEE80211_CONF_SUPPORT_HT_MODE;
1110         ht_conf.ht_supported = 1;
1111
1112         ht_conf.cap = req_ht_cap->cap & sband->ht_info.cap;
1113         ht_conf.cap &= ~(IEEE80211_HT_CAP_MIMO_PS);
1114         ht_conf.cap |= sband->ht_info.cap & IEEE80211_HT_CAP_MIMO_PS;
1115         ht_bss_conf.primary_channel = req_bss_cap->primary_channel;
1116         ht_bss_conf.bss_cap = req_bss_cap->bss_cap;
1117         ht_bss_conf.bss_op_mode = req_bss_cap->bss_op_mode;
1118
1119         ht_conf.ampdu_factor = req_ht_cap->ampdu_factor;
1120         ht_conf.ampdu_density = req_ht_cap->ampdu_density;
1121
1122         /* Bits 96-100 */
1123         tx_mcs_set_cap = sband->ht_info.supp_mcs_set[12];
1124
1125         /* configure suppoerted Tx MCS according to requested MCS
1126          * (based in most cases on Rx capabilities of peer) and self
1127          * Tx MCS capabilities (as defined by low level driver HW
1128          * Tx capabilities) */
1129         if (!(tx_mcs_set_cap & IEEE80211_HT_CAP_MCS_TX_DEFINED))
1130                 goto check_changed;
1131
1132         /* Counting from 0 therfore + 1 */
1133         if (tx_mcs_set_cap & IEEE80211_HT_CAP_MCS_TX_RX_DIFF)
1134                 max_tx_streams = ((tx_mcs_set_cap &
1135                                 IEEE80211_HT_CAP_MCS_TX_STREAMS) >> 2) + 1;
1136
1137         for (i = 0; i < max_tx_streams; i++)
1138                 ht_conf.supp_mcs_set[i] =
1139                         sband->ht_info.supp_mcs_set[i] &
1140                                         req_ht_cap->supp_mcs_set[i];
1141
1142         if (tx_mcs_set_cap & IEEE80211_HT_CAP_MCS_TX_UEQM)
1143                 for (i = IEEE80211_SUPP_MCS_SET_UEQM;
1144                      i < IEEE80211_SUPP_MCS_SET_LEN; i++)
1145                         ht_conf.supp_mcs_set[i] =
1146                                 sband->ht_info.supp_mcs_set[i] &
1147                                         req_ht_cap->supp_mcs_set[i];
1148
1149 check_changed:
1150         /* if bss configuration changed store the new one */
1151         if (memcmp(&conf->ht_conf, &ht_conf, sizeof(ht_conf)) ||
1152             memcmp(&conf->ht_bss_conf, &ht_bss_conf, sizeof(ht_bss_conf))) {
1153                 changed |= BSS_CHANGED_HT;
1154                 memcpy(&conf->ht_conf, &ht_conf, sizeof(ht_conf));
1155                 memcpy(&conf->ht_bss_conf, &ht_bss_conf, sizeof(ht_bss_conf));
1156         }
1157 out:
1158         return changed;
1159 }
1160
1161 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
1162                                       u32 changed)
1163 {
1164         struct ieee80211_local *local = sdata->local;
1165
1166         if (!changed)
1167                 return;
1168
1169         if (local->ops->bss_info_changed)
1170                 local->ops->bss_info_changed(local_to_hw(local),
1171                                              &sdata->vif,
1172                                              &sdata->bss_conf,
1173                                              changed);
1174 }
1175
1176 u32 ieee80211_reset_erp_info(struct net_device *dev)
1177 {
1178         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1179
1180         sdata->bss_conf.use_cts_prot = 0;
1181         sdata->bss_conf.use_short_preamble = 0;
1182         return BSS_CHANGED_ERP_CTS_PROT | BSS_CHANGED_ERP_PREAMBLE;
1183 }
1184
1185 void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
1186                                  struct sk_buff *skb)
1187 {
1188         struct ieee80211_local *local = hw_to_local(hw);
1189         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1190         int tmp;
1191
1192         skb->dev = local->mdev;
1193         skb->pkt_type = IEEE80211_TX_STATUS_MSG;
1194         skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ?
1195                        &local->skb_queue : &local->skb_queue_unreliable, skb);
1196         tmp = skb_queue_len(&local->skb_queue) +
1197                 skb_queue_len(&local->skb_queue_unreliable);
1198         while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
1199                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
1200                 dev_kfree_skb_irq(skb);
1201                 tmp--;
1202                 I802_DEBUG_INC(local->tx_status_drop);
1203         }
1204         tasklet_schedule(&local->tasklet);
1205 }
1206 EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
1207
1208 static void ieee80211_tasklet_handler(unsigned long data)
1209 {
1210         struct ieee80211_local *local = (struct ieee80211_local *) data;
1211         struct sk_buff *skb;
1212         struct ieee80211_rx_status rx_status;
1213         struct ieee80211_ra_tid *ra_tid;
1214
1215         while ((skb = skb_dequeue(&local->skb_queue)) ||
1216                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
1217                 switch (skb->pkt_type) {
1218                 case IEEE80211_RX_MSG:
1219                         /* status is in skb->cb */
1220                         memcpy(&rx_status, skb->cb, sizeof(rx_status));
1221                         /* Clear skb->pkt_type in order to not confuse kernel
1222                          * netstack. */
1223                         skb->pkt_type = 0;
1224                         __ieee80211_rx(local_to_hw(local), skb, &rx_status);
1225                         break;
1226                 case IEEE80211_TX_STATUS_MSG:
1227                         skb->pkt_type = 0;
1228                         ieee80211_tx_status(local_to_hw(local), skb);
1229                         break;
1230                 case IEEE80211_DELBA_MSG:
1231                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
1232                         ieee80211_stop_tx_ba_cb(local_to_hw(local),
1233                                                 ra_tid->ra, ra_tid->tid);
1234                         dev_kfree_skb(skb);
1235                         break;
1236                 case IEEE80211_ADDBA_MSG:
1237                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
1238                         ieee80211_start_tx_ba_cb(local_to_hw(local),
1239                                                  ra_tid->ra, ra_tid->tid);
1240                         dev_kfree_skb(skb);
1241                         break ;
1242                 default:
1243                         WARN_ON(1);
1244                         dev_kfree_skb(skb);
1245                         break;
1246                 }
1247         }
1248 }
1249
1250 /* Remove added headers (e.g., QoS control), encryption header/MIC, etc. to
1251  * make a prepared TX frame (one that has been given to hw) to look like brand
1252  * new IEEE 802.11 frame that is ready to go through TX processing again.
1253  * Also, tx_packet_data in cb is restored from tx_control. */
1254 static void ieee80211_remove_tx_extra(struct ieee80211_local *local,
1255                                       struct ieee80211_key *key,
1256                                       struct sk_buff *skb)
1257 {
1258         int hdrlen, iv_len, mic_len;
1259         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1260
1261         info->flags &=  IEEE80211_TX_CTL_REQ_TX_STATUS |
1262                         IEEE80211_TX_CTL_DO_NOT_ENCRYPT |
1263                         IEEE80211_TX_CTL_REQUEUE |
1264                         IEEE80211_TX_CTL_EAPOL_FRAME;
1265
1266         hdrlen = ieee80211_get_hdrlen_from_skb(skb);
1267
1268         if (!key)
1269                 goto no_key;
1270
1271         switch (key->conf.alg) {
1272         case ALG_WEP:
1273                 iv_len = WEP_IV_LEN;
1274                 mic_len = WEP_ICV_LEN;
1275                 break;
1276         case ALG_TKIP:
1277                 iv_len = TKIP_IV_LEN;
1278                 mic_len = TKIP_ICV_LEN;
1279                 break;
1280         case ALG_CCMP:
1281                 iv_len = CCMP_HDR_LEN;
1282                 mic_len = CCMP_MIC_LEN;
1283                 break;
1284         default:
1285                 goto no_key;
1286         }
1287
1288         if (skb->len >= mic_len &&
1289             !(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
1290                 skb_trim(skb, skb->len - mic_len);
1291         if (skb->len >= iv_len && skb->len > hdrlen) {
1292                 memmove(skb->data + iv_len, skb->data, hdrlen);
1293                 skb_pull(skb, iv_len);
1294         }
1295
1296 no_key:
1297         {
1298                 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1299                 u16 fc = le16_to_cpu(hdr->frame_control);
1300                 if ((fc & 0x8C) == 0x88) /* QoS Control Field */ {
1301                         fc &= ~IEEE80211_STYPE_QOS_DATA;
1302                         hdr->frame_control = cpu_to_le16(fc);
1303                         memmove(skb->data + 2, skb->data, hdrlen - 2);
1304                         skb_pull(skb, 2);
1305                 }
1306         }
1307 }
1308
1309 static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
1310                                             struct sta_info *sta,
1311                                             struct sk_buff *skb)
1312 {
1313         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1314
1315         sta->tx_filtered_count++;
1316
1317         /*
1318          * Clear the TX filter mask for this STA when sending the next
1319          * packet. If the STA went to power save mode, this will happen
1320          * when it wakes up for the next time.
1321          */
1322         set_sta_flags(sta, WLAN_STA_CLEAR_PS_FILT);
1323
1324         /*
1325          * This code races in the following way:
1326          *
1327          *  (1) STA sends frame indicating it will go to sleep and does so
1328          *  (2) hardware/firmware adds STA to filter list, passes frame up
1329          *  (3) hardware/firmware processes TX fifo and suppresses a frame
1330          *  (4) we get TX status before having processed the frame and
1331          *      knowing that the STA has gone to sleep.
1332          *
1333          * This is actually quite unlikely even when both those events are
1334          * processed from interrupts coming in quickly after one another or
1335          * even at the same time because we queue both TX status events and
1336          * RX frames to be processed by a tasklet and process them in the
1337          * same order that they were received or TX status last. Hence, there
1338          * is no race as long as the frame RX is processed before the next TX
1339          * status, which drivers can ensure, see below.
1340          *
1341          * Note that this can only happen if the hardware or firmware can
1342          * actually add STAs to the filter list, if this is done by the
1343          * driver in response to set_tim() (which will only reduce the race
1344          * this whole filtering tries to solve, not completely solve it)
1345          * this situation cannot happen.
1346          *
1347          * To completely solve this race drivers need to make sure that they
1348          *  (a) don't mix the irq-safe/not irq-safe TX status/RX processing
1349          *      functions and
1350          *  (b) always process RX events before TX status events if ordering
1351          *      can be unknown, for example with different interrupt status
1352          *      bits.
1353          */
1354         if (test_sta_flags(sta, WLAN_STA_PS) &&
1355             skb_queue_len(&sta->tx_filtered) < STA_MAX_TX_BUFFER) {
1356                 ieee80211_remove_tx_extra(local, sta->key, skb);
1357                 skb_queue_tail(&sta->tx_filtered, skb);
1358                 return;
1359         }
1360
1361         if (!test_sta_flags(sta, WLAN_STA_PS) &&
1362             !(info->flags & IEEE80211_TX_CTL_REQUEUE)) {
1363                 /* Software retry the packet once */
1364                 info->flags |= IEEE80211_TX_CTL_REQUEUE;
1365                 ieee80211_remove_tx_extra(local, sta->key, skb);
1366                 dev_queue_xmit(skb);
1367                 return;
1368         }
1369
1370 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1371         if (net_ratelimit())
1372                 printk(KERN_DEBUG "%s: dropped TX filtered frame, "
1373                        "queue_len=%d PS=%d @%lu\n",
1374                        wiphy_name(local->hw.wiphy),
1375                        skb_queue_len(&sta->tx_filtered),
1376                        !!test_sta_flags(sta, WLAN_STA_PS), jiffies);
1377 #endif
1378         dev_kfree_skb(skb);
1379 }
1380
1381 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
1382 {
1383         struct sk_buff *skb2;
1384         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1385         struct ieee80211_local *local = hw_to_local(hw);
1386         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1387         u16 frag, type;
1388         __le16 fc;
1389         struct ieee80211_tx_status_rtap_hdr *rthdr;
1390         struct ieee80211_sub_if_data *sdata;
1391         struct net_device *prev_dev = NULL;
1392         struct sta_info *sta;
1393
1394         rcu_read_lock();
1395
1396         if (info->status.excessive_retries) {
1397                 sta = sta_info_get(local, hdr->addr1);
1398                 if (sta) {
1399                         if (test_sta_flags(sta, WLAN_STA_PS)) {
1400                                 /*
1401                                  * The STA is in power save mode, so assume
1402                                  * that this TX packet failed because of that.
1403                                  */
1404                                 ieee80211_handle_filtered_frame(local, sta, skb);
1405                                 rcu_read_unlock();
1406                                 return;
1407                         }
1408                 }
1409         }
1410
1411         fc = hdr->frame_control;
1412
1413         if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
1414             (ieee80211_is_data_qos(fc))) {
1415                 u16 tid, ssn;
1416                 u8 *qc;
1417                 sta = sta_info_get(local, hdr->addr1);
1418                 if (sta) {
1419                         qc = ieee80211_get_qos_ctl(hdr);
1420                         tid = qc[0] & 0xf;
1421                         ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
1422                                                 & IEEE80211_SCTL_SEQ);
1423                         ieee80211_send_bar(sta->sdata->dev, hdr->addr1,
1424                                            tid, ssn);
1425                 }
1426         }
1427
1428         if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
1429                 sta = sta_info_get(local, hdr->addr1);
1430                 if (sta) {
1431                         ieee80211_handle_filtered_frame(local, sta, skb);
1432                         rcu_read_unlock();
1433                         return;
1434                 }
1435         } else
1436                 rate_control_tx_status(local->mdev, skb);
1437
1438         rcu_read_unlock();
1439
1440         ieee80211_led_tx(local, 0);
1441
1442         /* SNMP counters
1443          * Fragments are passed to low-level drivers as separate skbs, so these
1444          * are actually fragments, not frames. Update frame counters only for
1445          * the first fragment of the frame. */
1446
1447         frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG;
1448         type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE;
1449
1450         if (info->flags & IEEE80211_TX_STAT_ACK) {
1451                 if (frag == 0) {
1452                         local->dot11TransmittedFrameCount++;
1453                         if (is_multicast_ether_addr(hdr->addr1))
1454                                 local->dot11MulticastTransmittedFrameCount++;
1455                         if (info->status.retry_count > 0)
1456                                 local->dot11RetryCount++;
1457                         if (info->status.retry_count > 1)
1458                                 local->dot11MultipleRetryCount++;
1459                 }
1460
1461                 /* This counter shall be incremented for an acknowledged MPDU
1462                  * with an individual address in the address 1 field or an MPDU
1463                  * with a multicast address in the address 1 field of type Data
1464                  * or Management. */
1465                 if (!is_multicast_ether_addr(hdr->addr1) ||
1466                     type == IEEE80211_FTYPE_DATA ||
1467                     type == IEEE80211_FTYPE_MGMT)
1468                         local->dot11TransmittedFragmentCount++;
1469         } else {
1470                 if (frag == 0)
1471                         local->dot11FailedCount++;
1472         }
1473
1474         /* this was a transmitted frame, but now we want to reuse it */
1475         skb_orphan(skb);
1476
1477         /*
1478          * This is a bit racy but we can avoid a lot of work
1479          * with this test...
1480          */
1481         if (!local->monitors && !local->cooked_mntrs) {
1482                 dev_kfree_skb(skb);
1483                 return;
1484         }
1485
1486         /* send frame to monitor interfaces now */
1487
1488         if (skb_headroom(skb) < sizeof(*rthdr)) {
1489                 printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
1490                 dev_kfree_skb(skb);
1491                 return;
1492         }
1493
1494         rthdr = (struct ieee80211_tx_status_rtap_hdr *)
1495                                 skb_push(skb, sizeof(*rthdr));
1496
1497         memset(rthdr, 0, sizeof(*rthdr));
1498         rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
1499         rthdr->hdr.it_present =
1500                 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
1501                             (1 << IEEE80211_RADIOTAP_DATA_RETRIES));
1502
1503         if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
1504             !is_multicast_ether_addr(hdr->addr1))
1505                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL);
1506
1507         if ((info->flags & IEEE80211_TX_CTL_USE_RTS_CTS) &&
1508             (info->flags & IEEE80211_TX_CTL_USE_CTS_PROTECT))
1509                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS);
1510         else if (info->flags & IEEE80211_TX_CTL_USE_RTS_CTS)
1511                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS);
1512
1513         rthdr->data_retries = info->status.retry_count;
1514
1515         /* XXX: is this sufficient for BPF? */
1516         skb_set_mac_header(skb, 0);
1517         skb->ip_summed = CHECKSUM_UNNECESSARY;
1518         skb->pkt_type = PACKET_OTHERHOST;
1519         skb->protocol = htons(ETH_P_802_2);
1520         memset(skb->cb, 0, sizeof(skb->cb));
1521
1522         rcu_read_lock();
1523         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
1524                 if (sdata->vif.type == IEEE80211_IF_TYPE_MNTR) {
1525                         if (!netif_running(sdata->dev))
1526                                 continue;
1527
1528                         if (prev_dev) {
1529                                 skb2 = skb_clone(skb, GFP_ATOMIC);
1530                                 if (skb2) {
1531                                         skb2->dev = prev_dev;
1532                                         netif_rx(skb2);
1533                                 }
1534                         }
1535
1536                         prev_dev = sdata->dev;
1537                 }
1538         }
1539         if (prev_dev) {
1540                 skb->dev = prev_dev;
1541                 netif_rx(skb);
1542                 skb = NULL;
1543         }
1544         rcu_read_unlock();
1545         dev_kfree_skb(skb);
1546 }
1547 EXPORT_SYMBOL(ieee80211_tx_status);
1548
1549 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
1550                                         const struct ieee80211_ops *ops)
1551 {
1552         struct ieee80211_local *local;
1553         int priv_size;
1554         struct wiphy *wiphy;
1555
1556         /* Ensure 32-byte alignment of our private data and hw private data.
1557          * We use the wiphy priv data for both our ieee80211_local and for
1558          * the driver's private data
1559          *
1560          * In memory it'll be like this:
1561          *
1562          * +-------------------------+
1563          * | struct wiphy           |
1564          * +-------------------------+
1565          * | struct ieee80211_local  |
1566          * +-------------------------+
1567          * | driver's private data   |
1568          * +-------------------------+
1569          *
1570          */
1571         priv_size = ((sizeof(struct ieee80211_local) +
1572                       NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST) +
1573                     priv_data_len;
1574
1575         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
1576
1577         if (!wiphy)
1578                 return NULL;
1579
1580         wiphy->privid = mac80211_wiphy_privid;
1581
1582         local = wiphy_priv(wiphy);
1583         local->hw.wiphy = wiphy;
1584
1585         local->hw.priv = (char *)local +
1586                          ((sizeof(struct ieee80211_local) +
1587                            NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);
1588
1589         BUG_ON(!ops->tx);
1590         BUG_ON(!ops->start);
1591         BUG_ON(!ops->stop);
1592         BUG_ON(!ops->config);
1593         BUG_ON(!ops->add_interface);
1594         BUG_ON(!ops->remove_interface);
1595         BUG_ON(!ops->configure_filter);
1596         local->ops = ops;
1597
1598         local->hw.queues = 1; /* default */
1599
1600         local->bridge_packets = 1;
1601
1602         local->rts_threshold = IEEE80211_MAX_RTS_THRESHOLD;
1603         local->fragmentation_threshold = IEEE80211_MAX_FRAG_THRESHOLD;
1604         local->short_retry_limit = 7;
1605         local->long_retry_limit = 4;
1606         local->hw.conf.radio_enabled = 1;
1607
1608         INIT_LIST_HEAD(&local->interfaces);
1609
1610         spin_lock_init(&local->key_lock);
1611
1612         INIT_DELAYED_WORK(&local->scan_work, ieee80211_sta_scan_work);
1613
1614         sta_info_init(local);
1615
1616         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
1617                      (unsigned long)local);
1618         tasklet_disable(&local->tx_pending_tasklet);
1619
1620         tasklet_init(&local->tasklet,
1621                      ieee80211_tasklet_handler,
1622                      (unsigned long) local);
1623         tasklet_disable(&local->tasklet);
1624
1625         skb_queue_head_init(&local->skb_queue);
1626         skb_queue_head_init(&local->skb_queue_unreliable);
1627
1628         return local_to_hw(local);
1629 }
1630 EXPORT_SYMBOL(ieee80211_alloc_hw);
1631
1632 int ieee80211_register_hw(struct ieee80211_hw *hw)
1633 {
1634         struct ieee80211_local *local = hw_to_local(hw);
1635         const char *name;
1636         int result;
1637         enum ieee80211_band band;
1638         struct net_device *mdev;
1639         struct wireless_dev *mwdev;
1640
1641         /*
1642          * generic code guarantees at least one band,
1643          * set this very early because much code assumes
1644          * that hw.conf.channel is assigned
1645          */
1646         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1647                 struct ieee80211_supported_band *sband;
1648
1649                 sband = local->hw.wiphy->bands[band];
1650                 if (sband) {
1651                         /* init channel we're on */
1652                         local->hw.conf.channel =
1653                         local->oper_channel =
1654                         local->scan_channel = &sband->channels[0];
1655                         break;
1656                 }
1657         }
1658
1659         result = wiphy_register(local->hw.wiphy);
1660         if (result < 0)
1661                 return result;
1662
1663         /*
1664          * We use the number of queues for feature tests (QoS, HT) internally
1665          * so restrict them appropriately.
1666          */
1667 #ifdef CONFIG_MAC80211_QOS
1668         if (hw->queues > IEEE80211_MAX_QUEUES)
1669                 hw->queues = IEEE80211_MAX_QUEUES;
1670         if (hw->ampdu_queues > IEEE80211_MAX_AMPDU_QUEUES)
1671                 hw->ampdu_queues = IEEE80211_MAX_AMPDU_QUEUES;
1672         if (hw->queues < 4)
1673                 hw->ampdu_queues = 0;
1674 #else
1675         hw->queues = 1;
1676         hw->ampdu_queues = 0;
1677 #endif
1678
1679         mdev = alloc_netdev_mq(sizeof(struct wireless_dev),
1680                                "wmaster%d", ether_setup,
1681                                ieee80211_num_queues(hw));
1682         if (!mdev)
1683                 goto fail_mdev_alloc;
1684
1685         if (ieee80211_num_queues(hw) > 1)
1686                 mdev->features |= NETIF_F_MULTI_QUEUE;
1687
1688         mwdev = netdev_priv(mdev);
1689         mdev->ieee80211_ptr = mwdev;
1690         mwdev->wiphy = local->hw.wiphy;
1691
1692         local->mdev = mdev;
1693
1694         ieee80211_rx_bss_list_init(local);
1695
1696         mdev->hard_start_xmit = ieee80211_master_start_xmit;
1697         mdev->open = ieee80211_master_open;
1698         mdev->stop = ieee80211_master_stop;
1699         mdev->type = ARPHRD_IEEE80211;
1700         mdev->header_ops = &ieee80211_header_ops;
1701         mdev->set_multicast_list = ieee80211_master_set_multicast_list;
1702
1703         name = wiphy_dev(local->hw.wiphy)->driver->name;
1704         local->hw.workqueue = create_freezeable_workqueue(name);
1705         if (!local->hw.workqueue) {
1706                 result = -ENOMEM;
1707                 goto fail_workqueue;
1708         }
1709
1710         /*
1711          * The hardware needs headroom for sending the frame,
1712          * and we need some headroom for passing the frame to monitor
1713          * interfaces, but never both at the same time.
1714          */
1715         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
1716                                    sizeof(struct ieee80211_tx_status_rtap_hdr));
1717
1718         debugfs_hw_add(local);
1719
1720         if (local->hw.conf.beacon_int < 10)
1721                 local->hw.conf.beacon_int = 100;
1722
1723         local->wstats_flags |= local->hw.flags & (IEEE80211_HW_SIGNAL_UNSPEC |
1724                                                   IEEE80211_HW_SIGNAL_DB |
1725                                                   IEEE80211_HW_SIGNAL_DBM) ?
1726                                IW_QUAL_QUAL_UPDATED : IW_QUAL_QUAL_INVALID;
1727         local->wstats_flags |= local->hw.flags & IEEE80211_HW_NOISE_DBM ?
1728                                IW_QUAL_NOISE_UPDATED : IW_QUAL_NOISE_INVALID;
1729         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
1730                 local->wstats_flags |= IW_QUAL_DBM;
1731
1732         result = sta_info_start(local);
1733         if (result < 0)
1734                 goto fail_sta_info;
1735
1736         rtnl_lock();
1737         result = dev_alloc_name(local->mdev, local->mdev->name);
1738         if (result < 0)
1739                 goto fail_dev;
1740
1741         memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1742         SET_NETDEV_DEV(local->mdev, wiphy_dev(local->hw.wiphy));
1743
1744         result = register_netdevice(local->mdev);
1745         if (result < 0)
1746                 goto fail_dev;
1747
1748         result = ieee80211_init_rate_ctrl_alg(local,
1749                                               hw->rate_control_algorithm);
1750         if (result < 0) {
1751                 printk(KERN_DEBUG "%s: Failed to initialize rate control "
1752                        "algorithm\n", wiphy_name(local->hw.wiphy));
1753                 goto fail_rate;
1754         }
1755
1756         result = ieee80211_wep_init(local);
1757
1758         if (result < 0) {
1759                 printk(KERN_DEBUG "%s: Failed to initialize wep\n",
1760                        wiphy_name(local->hw.wiphy));
1761                 goto fail_wep;
1762         }
1763
1764         ieee80211_install_qdisc(local->mdev);
1765
1766         /* add one default STA interface */
1767         result = ieee80211_if_add(local, "wlan%d", NULL,
1768                                   IEEE80211_IF_TYPE_STA, NULL);
1769         if (result)
1770                 printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
1771                        wiphy_name(local->hw.wiphy));
1772
1773         rtnl_unlock();
1774
1775         ieee80211_led_init(local);
1776
1777         return 0;
1778
1779 fail_wep:
1780         rate_control_deinitialize(local);
1781 fail_rate:
1782         unregister_netdevice(local->mdev);
1783         local->mdev = NULL;
1784 fail_dev:
1785         rtnl_unlock();
1786         sta_info_stop(local);
1787 fail_sta_info:
1788         debugfs_hw_del(local);
1789         destroy_workqueue(local->hw.workqueue);
1790 fail_workqueue:
1791         if (local->mdev)
1792                 free_netdev(local->mdev);
1793 fail_mdev_alloc:
1794         wiphy_unregister(local->hw.wiphy);
1795         return result;
1796 }
1797 EXPORT_SYMBOL(ieee80211_register_hw);
1798
1799 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
1800 {
1801         struct ieee80211_local *local = hw_to_local(hw);
1802
1803         tasklet_kill(&local->tx_pending_tasklet);
1804         tasklet_kill(&local->tasklet);
1805
1806         rtnl_lock();
1807
1808         /*
1809          * At this point, interface list manipulations are fine
1810          * because the driver cannot be handing us frames any
1811          * more and the tasklet is killed.
1812          */
1813
1814         /* First, we remove all virtual interfaces. */
1815         ieee80211_remove_interfaces(local);
1816
1817         /* then, finally, remove the master interface */
1818         unregister_netdevice(local->mdev);
1819
1820         rtnl_unlock();
1821
1822         ieee80211_rx_bss_list_deinit(local);
1823         ieee80211_clear_tx_pending(local);
1824         sta_info_stop(local);
1825         rate_control_deinitialize(local);
1826         debugfs_hw_del(local);
1827
1828         if (skb_queue_len(&local->skb_queue)
1829                         || skb_queue_len(&local->skb_queue_unreliable))
1830                 printk(KERN_WARNING "%s: skb_queue not empty\n",
1831                        wiphy_name(local->hw.wiphy));
1832         skb_queue_purge(&local->skb_queue);
1833         skb_queue_purge(&local->skb_queue_unreliable);
1834
1835         destroy_workqueue(local->hw.workqueue);
1836         wiphy_unregister(local->hw.wiphy);
1837         ieee80211_wep_free(local);
1838         ieee80211_led_exit(local);
1839         free_netdev(local->mdev);
1840 }
1841 EXPORT_SYMBOL(ieee80211_unregister_hw);
1842
1843 void ieee80211_free_hw(struct ieee80211_hw *hw)
1844 {
1845         struct ieee80211_local *local = hw_to_local(hw);
1846
1847         wiphy_free(local->hw.wiphy);
1848 }
1849 EXPORT_SYMBOL(ieee80211_free_hw);
1850
1851 static int __init ieee80211_init(void)
1852 {
1853         struct sk_buff *skb;
1854         int ret;
1855
1856         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1857         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1858                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1859
1860         ret = rc80211_pid_init();
1861         if (ret)
1862                 goto out;
1863
1864         ret = ieee80211_wme_register();
1865         if (ret) {
1866                 printk(KERN_DEBUG "ieee80211_init: failed to "
1867                        "initialize WME (err=%d)\n", ret);
1868                 goto out_cleanup_pid;
1869         }
1870
1871         ieee80211_debugfs_netdev_init();
1872
1873         return 0;
1874
1875  out_cleanup_pid:
1876         rc80211_pid_exit();
1877  out:
1878         return ret;
1879 }
1880
1881 static void __exit ieee80211_exit(void)
1882 {
1883         rc80211_pid_exit();
1884
1885         /*
1886          * For key todo, it'll be empty by now but the work
1887          * might still be scheduled.
1888          */
1889         flush_scheduled_work();
1890
1891         if (mesh_allocated)
1892                 ieee80211s_stop();
1893
1894         ieee80211_wme_unregister();
1895         ieee80211_debugfs_netdev_exit();
1896 }
1897
1898
1899 subsys_initcall(ieee80211_init);
1900 module_exit(ieee80211_exit);
1901
1902 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1903 MODULE_LICENSE("GPL");