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fs: check for statfs overflow
[linux-2.6/mini2440.git] / net / mac80211 / main.c
blobf1a83d450ea0a338d1464adbf3bdec2b48f5eff4
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_tx_start_all_queues(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_addr_lock_bh(local->mdev);
295 ieee80211_configure_filter(local);
296 netif_addr_unlock_bh(local->mdev);
297 break;
298 case IEEE80211_IF_TYPE_STA:
299 case IEEE80211_IF_TYPE_IBSS:
300 sdata->u.sta.flags &= ~IEEE80211_STA_PREV_BSSID_SET;
301 /* fall through */
302 default:
303 conf.vif = &sdata->vif;
304 conf.type = sdata->vif.type;
305 conf.mac_addr = dev->dev_addr;
306 res = local->ops->add_interface(local_to_hw(local), &conf);
307 if (res)
308 goto err_stop;
309
310 if (ieee80211_vif_is_mesh(&sdata->vif))
311 ieee80211_start_mesh(sdata->dev);
312 changed |= ieee80211_reset_erp_info(dev);
313 ieee80211_bss_info_change_notify(sdata, changed);
314 ieee80211_enable_keys(sdata);
315
316 if (sdata->vif.type == IEEE80211_IF_TYPE_STA &&
317 !(sdata->flags & IEEE80211_SDATA_USERSPACE_MLME))
318 netif_carrier_off(dev);
319 else
320 netif_carrier_on(dev);
321 }
322
323 if (sdata->vif.type == IEEE80211_IF_TYPE_WDS) {
324 /* Create STA entry for the WDS peer */
325 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
326 GFP_KERNEL);
327 if (!sta) {
328 res = -ENOMEM;
329 goto err_del_interface;
330 }
331
332 /* no locking required since STA is not live yet */
333 sta->flags |= WLAN_STA_AUTHORIZED;
334
335 res = sta_info_insert(sta);
336 if (res) {
337 /* STA has been freed */
338 goto err_del_interface;
339 }
340 }
341
342 if (local->open_count == 0) {
343 res = dev_open(local->mdev);
344 WARN_ON(res);
345 if (res)
346 goto err_del_interface;
347 tasklet_enable(&local->tx_pending_tasklet);
348 tasklet_enable(&local->tasklet);
349 }
350
351 /*
352 * set_multicast_list will be invoked by the networking core
353 * which will check whether any increments here were done in
354 * error and sync them down to the hardware as filter flags.
355 */
356 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
357 atomic_inc(&local->iff_allmultis);
358
359 if (sdata->flags & IEEE80211_SDATA_PROMISC)
360 atomic_inc(&local->iff_promiscs);
361
362 local->open_count++;
363 if (need_hw_reconfig)
364 ieee80211_hw_config(local);
365
366 /*
367 * ieee80211_sta_work is disabled while network interface
368 * is down. Therefore, some configuration changes may not
369 * yet be effective. Trigger execution of ieee80211_sta_work
370 * to fix this.
371 */
372 if (sdata->vif.type == IEEE80211_IF_TYPE_STA ||
373 sdata->vif.type == IEEE80211_IF_TYPE_IBSS) {
374 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
375 queue_work(local->hw.workqueue, &ifsta->work);
376 }
377
378 netif_tx_start_all_queues(dev);
379
380 return 0;
381 err_del_interface:
382 local->ops->remove_interface(local_to_hw(local), &conf);
383 err_stop:
384 if (!local->open_count && local->ops->stop)
385 local->ops->stop(local_to_hw(local));
386 err_del_bss:
387 sdata->bss = NULL;
388 if (sdata->vif.type == IEEE80211_IF_TYPE_VLAN)
389 list_del(&sdata->u.vlan.list);
390 return res;
391 }
392
393 static int ieee80211_stop(struct net_device *dev)
394 {
395 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
396 struct ieee80211_local *local = sdata->local;
397 struct ieee80211_if_init_conf conf;
398 struct sta_info *sta;
399
400 /*
401 * Stop TX on this interface first.
402 */
403 netif_tx_stop_all_queues(dev);
404
405 /*
406 * Now delete all active aggregation sessions.
407 */
408 rcu_read_lock();
409
410 list_for_each_entry_rcu(sta, &local->sta_list, list) {
411 if (sta->sdata == sdata)
412 ieee80211_sta_tear_down_BA_sessions(dev, sta->addr);
413 }
414
415 rcu_read_unlock();
416
417 /*
418 * Remove all stations associated with this interface.
419 *
420 * This must be done before calling ops->remove_interface()
421 * because otherwise we can later invoke ops->sta_notify()
422 * whenever the STAs are removed, and that invalidates driver
423 * assumptions about always getting a vif pointer that is valid
424 * (because if we remove a STA after ops->remove_interface()
425 * the driver will have removed the vif info already!)
426 *
427 * We could relax this and only unlink the stations from the
428 * hash table and list but keep them on a per-sdata list that
429 * will be inserted back again when the interface is brought
430 * up again, but I don't currently see a use case for that,
431 * except with WDS which gets a STA entry created when it is
432 * brought up.
433 */
434 sta_info_flush(local, sdata);
435
436 /*
437 * Don't count this interface for promisc/allmulti while it
438 * is down. dev_mc_unsync() will invoke set_multicast_list
439 * on the master interface which will sync these down to the
440 * hardware as filter flags.
441 */
442 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
443 atomic_dec(&local->iff_allmultis);
444
445 if (sdata->flags & IEEE80211_SDATA_PROMISC)
446 atomic_dec(&local->iff_promiscs);
447
448 dev_mc_unsync(local->mdev, dev);
449
450 /* APs need special treatment */
451 if (sdata->vif.type == IEEE80211_IF_TYPE_AP) {
452 struct ieee80211_sub_if_data *vlan, *tmp;
453 struct beacon_data *old_beacon = sdata->u.ap.beacon;
454
455 /* remove beacon */
456 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
457 synchronize_rcu();
458 kfree(old_beacon);
459
460 /* down all dependent devices, that is VLANs */
461 list_for_each_entry_safe(vlan, tmp, &sdata->u.ap.vlans,
462 u.vlan.list)
463 dev_close(vlan->dev);
464 WARN_ON(!list_empty(&sdata->u.ap.vlans));
465 }
466
467 local->open_count--;
468
469 switch (sdata->vif.type) {
470 case IEEE80211_IF_TYPE_VLAN:
471 list_del(&sdata->u.vlan.list);
472 /* no need to tell driver */
473 break;
474 case IEEE80211_IF_TYPE_MNTR:
475 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
476 local->cooked_mntrs--;
477 break;
478 }
479
480 local->monitors--;
481 if (local->monitors == 0)
482 local->hw.conf.flags &= ~IEEE80211_CONF_RADIOTAP;
483
484 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
485 local->fif_fcsfail--;
486 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
487 local->fif_plcpfail--;
488 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL)
489 local->fif_control--;
490 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
491 local->fif_other_bss--;
492
493 netif_addr_lock_bh(local->mdev);
494 ieee80211_configure_filter(local);
495 netif_addr_unlock_bh(local->mdev);
496 break;
497 case IEEE80211_IF_TYPE_MESH_POINT:
498 case IEEE80211_IF_TYPE_STA:
499 case IEEE80211_IF_TYPE_IBSS:
500 sdata->u.sta.state = IEEE80211_DISABLED;
501 memset(sdata->u.sta.bssid, 0, ETH_ALEN);
502 del_timer_sync(&sdata->u.sta.timer);
503 /*
504 * When we get here, the interface is marked down.
505 * Call synchronize_rcu() to wait for the RX path
506 * should it be using the interface and enqueuing
507 * frames at this very time on another CPU.
508 */
509 synchronize_rcu();
510 skb_queue_purge(&sdata->u.sta.skb_queue);
511
512 if (local->scan_dev == sdata->dev) {
513 if (!local->ops->hw_scan) {
514 local->sta_sw_scanning = 0;
515 cancel_delayed_work(&local->scan_work);
516 } else
517 local->sta_hw_scanning = 0;
518 }
519
520 sdata->u.sta.flags &= ~IEEE80211_STA_PRIVACY_INVOKED;
521 kfree(sdata->u.sta.extra_ie);
522 sdata->u.sta.extra_ie = NULL;
523 sdata->u.sta.extra_ie_len = 0;
524 /* fall through */
525 default:
526 conf.vif = &sdata->vif;
527 conf.type = sdata->vif.type;
528 conf.mac_addr = dev->dev_addr;
529 /* disable all keys for as long as this netdev is down */
530 ieee80211_disable_keys(sdata);
531 local->ops->remove_interface(local_to_hw(local), &conf);
532 }
533
534 sdata->bss = NULL;
535
536 if (local->open_count == 0) {
537 if (netif_running(local->mdev))
538 dev_close(local->mdev);
539
540 if (local->ops->stop)
541 local->ops->stop(local_to_hw(local));
542
543 ieee80211_led_radio(local, 0);
544
545 flush_workqueue(local->hw.workqueue);
546
547 tasklet_disable(&local->tx_pending_tasklet);
548 tasklet_disable(&local->tasklet);
549 }
550
551 return 0;
552 }
553
554 int ieee80211_start_tx_ba_session(struct ieee80211_hw *hw, u8 *ra, u16 tid)
555 {
556 struct ieee80211_local *local = hw_to_local(hw);
557 struct sta_info *sta;
558 struct ieee80211_sub_if_data *sdata;
559 u16 start_seq_num = 0;
560 u8 *state;
561 int ret;
562 DECLARE_MAC_BUF(mac);
563
564 if (tid >= STA_TID_NUM)
565 return -EINVAL;
566
567 #ifdef CONFIG_MAC80211_HT_DEBUG
568 printk(KERN_DEBUG "Open BA session requested for %s tid %u\n",
569 print_mac(mac, ra), tid);
570 #endif /* CONFIG_MAC80211_HT_DEBUG */
571
572 rcu_read_lock();
573
574 sta = sta_info_get(local, ra);
575 if (!sta) {
576 #ifdef CONFIG_MAC80211_HT_DEBUG
577 printk(KERN_DEBUG "Could not find the station\n");
578 #endif
579 ret = -ENOENT;
580 goto exit;
581 }
582
583 spin_lock_bh(&sta->lock);
584
585 /* we have tried too many times, receiver does not want A-MPDU */
586 if (sta->ampdu_mlme.addba_req_num[tid] > HT_AGG_MAX_RETRIES) {
587 ret = -EBUSY;
588 goto err_unlock_sta;
589 }
590
591 state = &sta->ampdu_mlme.tid_state_tx[tid];
592 /* check if the TID is not in aggregation flow already */
593 if (*state != HT_AGG_STATE_IDLE) {
594 #ifdef CONFIG_MAC80211_HT_DEBUG
595 printk(KERN_DEBUG "BA request denied - session is not "
596 "idle on tid %u\n", tid);
597 #endif /* CONFIG_MAC80211_HT_DEBUG */
598 ret = -EAGAIN;
599 goto err_unlock_sta;
600 }
601
602 /* prepare A-MPDU MLME for Tx aggregation */
603 sta->ampdu_mlme.tid_tx[tid] =
604 kmalloc(sizeof(struct tid_ampdu_tx), GFP_ATOMIC);
605 if (!sta->ampdu_mlme.tid_tx[tid]) {
606 #ifdef CONFIG_MAC80211_HT_DEBUG
607 if (net_ratelimit())
608 printk(KERN_ERR "allocate tx mlme to tid %d failed\n",
609 tid);
610 #endif
611 ret = -ENOMEM;
612 goto err_unlock_sta;
613 }
614 /* Tx timer */
615 sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.function =
616 sta_addba_resp_timer_expired;
617 sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.data =
618 (unsigned long)&sta->timer_to_tid[tid];
619 init_timer(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer);
620
621 /* create a new queue for this aggregation */
622 ret = ieee80211_ht_agg_queue_add(local, sta, tid);
623
624 /* case no queue is available to aggregation
625 * don't switch to aggregation */
626 if (ret) {
627 #ifdef CONFIG_MAC80211_HT_DEBUG
628 printk(KERN_DEBUG "BA request denied - queue unavailable for"
629 " tid %d\n", tid);
630 #endif /* CONFIG_MAC80211_HT_DEBUG */
631 goto err_unlock_queue;
632 }
633 sdata = sta->sdata;
634
635 /* Ok, the Addba frame hasn't been sent yet, but if the driver calls the
636 * call back right away, it must see that the flow has begun */
637 *state |= HT_ADDBA_REQUESTED_MSK;
638
639 if (local->ops->ampdu_action)
640 ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_TX_START,
641 ra, tid, &start_seq_num);
642
643 if (ret) {
644 /* No need to requeue the packets in the agg queue, since we
645 * held the tx lock: no packet could be enqueued to the newly
646 * allocated queue */
647 ieee80211_ht_agg_queue_remove(local, sta, tid, 0);
648 #ifdef CONFIG_MAC80211_HT_DEBUG
649 printk(KERN_DEBUG "BA request denied - HW unavailable for"
650 " tid %d\n", tid);
651 #endif /* CONFIG_MAC80211_HT_DEBUG */
652 *state = HT_AGG_STATE_IDLE;
653 goto err_unlock_queue;
654 }
655
656 /* Will put all the packets in the new SW queue */
657 ieee80211_requeue(local, ieee802_1d_to_ac[tid]);
658 spin_unlock_bh(&sta->lock);
659
660 /* send an addBA request */
661 sta->ampdu_mlme.dialog_token_allocator++;
662 sta->ampdu_mlme.tid_tx[tid]->dialog_token =
663 sta->ampdu_mlme.dialog_token_allocator;
664 sta->ampdu_mlme.tid_tx[tid]->ssn = start_seq_num;
665
666
667 ieee80211_send_addba_request(sta->sdata->dev, ra, tid,
668 sta->ampdu_mlme.tid_tx[tid]->dialog_token,
669 sta->ampdu_mlme.tid_tx[tid]->ssn,
670 0x40, 5000);
671 /* activate the timer for the recipient's addBA response */
672 sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.expires =
673 jiffies + ADDBA_RESP_INTERVAL;
674 add_timer(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer);
675 #ifdef CONFIG_MAC80211_HT_DEBUG
676 printk(KERN_DEBUG "activated addBA response timer on tid %d\n", tid);
677 #endif
678 goto exit;
679
680 err_unlock_queue:
681 kfree(sta->ampdu_mlme.tid_tx[tid]);
682 sta->ampdu_mlme.tid_tx[tid] = NULL;
683 ret = -EBUSY;
684 err_unlock_sta:
685 spin_unlock_bh(&sta->lock);
686 exit:
687 rcu_read_unlock();
688 return ret;
689 }
690 EXPORT_SYMBOL(ieee80211_start_tx_ba_session);
691
692 int ieee80211_stop_tx_ba_session(struct ieee80211_hw *hw,
693 u8 *ra, u16 tid,
694 enum ieee80211_back_parties initiator)
695 {
696 struct ieee80211_local *local = hw_to_local(hw);
697 struct sta_info *sta;
698 u8 *state;
699 int ret = 0;
700 DECLARE_MAC_BUF(mac);
701
702 if (tid >= STA_TID_NUM)
703 return -EINVAL;
704
705 rcu_read_lock();
706 sta = sta_info_get(local, ra);
707 if (!sta) {
708 rcu_read_unlock();
709 return -ENOENT;
710 }
711
712 /* check if the TID is in aggregation */
713 state = &sta->ampdu_mlme.tid_state_tx[tid];
714 spin_lock_bh(&sta->lock);
715
716 if (*state != HT_AGG_STATE_OPERATIONAL) {
717 ret = -ENOENT;
718 goto stop_BA_exit;
719 }
720
721 #ifdef CONFIG_MAC80211_HT_DEBUG
722 printk(KERN_DEBUG "Tx BA session stop requested for %s tid %u\n",
723 print_mac(mac, ra), tid);
724 #endif /* CONFIG_MAC80211_HT_DEBUG */
725
726 ieee80211_stop_queue(hw, sta->tid_to_tx_q[tid]);
727
728 *state = HT_AGG_STATE_REQ_STOP_BA_MSK |
729 (initiator << HT_AGG_STATE_INITIATOR_SHIFT);
730
731 if (local->ops->ampdu_action)
732 ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_TX_STOP,
733 ra, tid, NULL);
734
735 /* case HW denied going back to legacy */
736 if (ret) {
737 WARN_ON(ret != -EBUSY);
738 *state = HT_AGG_STATE_OPERATIONAL;
739 ieee80211_wake_queue(hw, sta->tid_to_tx_q[tid]);
740 goto stop_BA_exit;
741 }
742
743 stop_BA_exit:
744 spin_unlock_bh(&sta->lock);
745 rcu_read_unlock();
746 return ret;
747 }
748 EXPORT_SYMBOL(ieee80211_stop_tx_ba_session);
749
750 void ieee80211_start_tx_ba_cb(struct ieee80211_hw *hw, u8 *ra, u16 tid)
751 {
752 struct ieee80211_local *local = hw_to_local(hw);
753 struct sta_info *sta;
754 u8 *state;
755 DECLARE_MAC_BUF(mac);
756
757 if (tid >= STA_TID_NUM) {
758 #ifdef CONFIG_MAC80211_HT_DEBUG
759 printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n",
760 tid, STA_TID_NUM);
761 #endif
762 return;
763 }
764
765 rcu_read_lock();
766 sta = sta_info_get(local, ra);
767 if (!sta) {
768 rcu_read_unlock();
769 #ifdef CONFIG_MAC80211_HT_DEBUG
770 printk(KERN_DEBUG "Could not find station: %s\n",
771 print_mac(mac, ra));
772 #endif
773 return;
774 }
775
776 state = &sta->ampdu_mlme.tid_state_tx[tid];
777 spin_lock_bh(&sta->lock);
778
779 if (!(*state & HT_ADDBA_REQUESTED_MSK)) {
780 #ifdef CONFIG_MAC80211_HT_DEBUG
781 printk(KERN_DEBUG "addBA was not requested yet, state is %d\n",
782 *state);
783 #endif
784 spin_unlock_bh(&sta->lock);
785 rcu_read_unlock();
786 return;
787 }
788
789 WARN_ON_ONCE(*state & HT_ADDBA_DRV_READY_MSK);
790
791 *state |= HT_ADDBA_DRV_READY_MSK;
792
793 if (*state == HT_AGG_STATE_OPERATIONAL) {
794 #ifdef CONFIG_MAC80211_HT_DEBUG
795 printk(KERN_DEBUG "Aggregation is on for tid %d \n", tid);
796 #endif
797 ieee80211_wake_queue(hw, sta->tid_to_tx_q[tid]);
798 }
799 spin_unlock_bh(&sta->lock);
800 rcu_read_unlock();
801 }
802 EXPORT_SYMBOL(ieee80211_start_tx_ba_cb);
803
804 void ieee80211_stop_tx_ba_cb(struct ieee80211_hw *hw, u8 *ra, u8 tid)
805 {
806 struct ieee80211_local *local = hw_to_local(hw);
807 struct sta_info *sta;
808 u8 *state;
809 int agg_queue;
810 DECLARE_MAC_BUF(mac);
811
812 if (tid >= STA_TID_NUM) {
813 #ifdef CONFIG_MAC80211_HT_DEBUG
814 printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n",
815 tid, STA_TID_NUM);
816 #endif
817 return;
818 }
819
820 #ifdef CONFIG_MAC80211_HT_DEBUG
821 printk(KERN_DEBUG "Stopping Tx BA session for %s tid %d\n",
822 print_mac(mac, ra), tid);
823 #endif /* CONFIG_MAC80211_HT_DEBUG */
824
825 rcu_read_lock();
826 sta = sta_info_get(local, ra);
827 if (!sta) {
828 #ifdef CONFIG_MAC80211_HT_DEBUG
829 printk(KERN_DEBUG "Could not find station: %s\n",
830 print_mac(mac, ra));
831 #endif
832 rcu_read_unlock();
833 return;
834 }
835 state = &sta->ampdu_mlme.tid_state_tx[tid];
836
837 /* NOTE: no need to use sta->lock in this state check, as
838 * ieee80211_stop_tx_ba_session will let only one stop call to
839 * pass through per sta/tid
840 */
841 if ((*state & HT_AGG_STATE_REQ_STOP_BA_MSK) == 0) {
842 #ifdef CONFIG_MAC80211_HT_DEBUG
843 printk(KERN_DEBUG "unexpected callback to A-MPDU stop\n");
844 #endif
845 rcu_read_unlock();
846 return;
847 }
848
849 if (*state & HT_AGG_STATE_INITIATOR_MSK)
850 ieee80211_send_delba(sta->sdata->dev, ra, tid,
851 WLAN_BACK_INITIATOR, WLAN_REASON_QSTA_NOT_USE);
852
853 agg_queue = sta->tid_to_tx_q[tid];
854
855 ieee80211_ht_agg_queue_remove(local, sta, tid, 1);
856
857 /* We just requeued the all the frames that were in the
858 * removed queue, and since we might miss a softirq we do
859 * netif_schedule_queue. ieee80211_wake_queue is not used
860 * here as this queue is not necessarily stopped
861 */
862 netif_schedule_queue(netdev_get_tx_queue(local->mdev, agg_queue));
863 spin_lock_bh(&sta->lock);
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 #ifdef CONFIG_MAC80211_HT_DEBUG
883 if (net_ratelimit())
884 printk(KERN_WARNING "%s: Not enough memory, "
885 "dropping start BA session", skb->dev->name);
886 #endif
887 return;
888 }
889 ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
890 memcpy(&ra_tid->ra, ra, ETH_ALEN);
891 ra_tid->tid = tid;
892
893 skb->pkt_type = IEEE80211_ADDBA_MSG;
894 skb_queue_tail(&local->skb_queue, skb);
895 tasklet_schedule(&local->tasklet);
896 }
897 EXPORT_SYMBOL(ieee80211_start_tx_ba_cb_irqsafe);
898
899 void ieee80211_stop_tx_ba_cb_irqsafe(struct ieee80211_hw *hw,
900 const u8 *ra, u16 tid)
901 {
902 struct ieee80211_local *local = hw_to_local(hw);
903 struct ieee80211_ra_tid *ra_tid;
904 struct sk_buff *skb = dev_alloc_skb(0);
905
906 if (unlikely(!skb)) {
907 #ifdef CONFIG_MAC80211_HT_DEBUG
908 if (net_ratelimit())
909 printk(KERN_WARNING "%s: Not enough memory, "
910 "dropping stop BA session", skb->dev->name);
911 #endif
912 return;
913 }
914 ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
915 memcpy(&ra_tid->ra, ra, ETH_ALEN);
916 ra_tid->tid = tid;
917
918 skb->pkt_type = IEEE80211_DELBA_MSG;
919 skb_queue_tail(&local->skb_queue, skb);
920 tasklet_schedule(&local->tasklet);
921 }
922 EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb_irqsafe);
923
924 static void ieee80211_set_multicast_list(struct net_device *dev)
925 {
926 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
927 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
928 int allmulti, promisc, sdata_allmulti, sdata_promisc;
929
930 allmulti = !!(dev->flags & IFF_ALLMULTI);
931 promisc = !!(dev->flags & IFF_PROMISC);
932 sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
933 sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
934
935 if (allmulti != sdata_allmulti) {
936 if (dev->flags & IFF_ALLMULTI)
937 atomic_inc(&local->iff_allmultis);
938 else
939 atomic_dec(&local->iff_allmultis);
940 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
941 }
942
943 if (promisc != sdata_promisc) {
944 if (dev->flags & IFF_PROMISC)
945 atomic_inc(&local->iff_promiscs);
946 else
947 atomic_dec(&local->iff_promiscs);
948 sdata->flags ^= IEEE80211_SDATA_PROMISC;
949 }
950
951 dev_mc_sync(local->mdev, dev);
952 }
953
954 static const struct header_ops ieee80211_header_ops = {
955 .create = eth_header,
956 .parse = header_parse_80211,
957 .rebuild = eth_rebuild_header,
958 .cache = eth_header_cache,
959 .cache_update = eth_header_cache_update,
960 };
961
962 void ieee80211_if_setup(struct net_device *dev)
963 {
964 ether_setup(dev);
965 dev->hard_start_xmit = ieee80211_subif_start_xmit;
966 dev->wireless_handlers = &ieee80211_iw_handler_def;
967 dev->set_multicast_list = ieee80211_set_multicast_list;
968 dev->change_mtu = ieee80211_change_mtu;
969 dev->open = ieee80211_open;
970 dev->stop = ieee80211_stop;
971 dev->destructor = free_netdev;
972 }
973
974 /* everything else */
975
976 int ieee80211_if_config(struct ieee80211_sub_if_data *sdata, u32 changed)
977 {
978 struct ieee80211_local *local = sdata->local;
979 struct ieee80211_if_conf conf;
980
981 if (WARN_ON(!netif_running(sdata->dev)))
982 return 0;
983
984 if (!local->ops->config_interface)
985 return 0;
986
987 memset(&conf, 0, sizeof(conf));
988 conf.changed = changed;
989
990 if (sdata->vif.type == IEEE80211_IF_TYPE_STA ||
991 sdata->vif.type == IEEE80211_IF_TYPE_IBSS) {
992 conf.bssid = sdata->u.sta.bssid;
993 conf.ssid = sdata->u.sta.ssid;
994 conf.ssid_len = sdata->u.sta.ssid_len;
995 } else if (sdata->vif.type == IEEE80211_IF_TYPE_AP) {
996 conf.bssid = sdata->dev->dev_addr;
997 conf.ssid = sdata->u.ap.ssid;
998 conf.ssid_len = sdata->u.ap.ssid_len;
999 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
1000 u8 zero[ETH_ALEN] = { 0 };
1001 conf.bssid = zero;
1002 conf.ssid = zero;
1003 conf.ssid_len = 0;
1004 } else {
1005 WARN_ON(1);
1006 return -EINVAL;
1007 }
1008
1009 if (WARN_ON(!conf.bssid && (changed & IEEE80211_IFCC_BSSID)))
1010 return -EINVAL;
1011
1012 if (WARN_ON(!conf.ssid && (changed & IEEE80211_IFCC_SSID)))
1013 return -EINVAL;
1014
1015 return local->ops->config_interface(local_to_hw(local),
1016 &sdata->vif, &conf);
1017 }
1018
1019 int ieee80211_hw_config(struct ieee80211_local *local)
1020 {
1021 struct ieee80211_channel *chan;
1022 int ret = 0;
1023
1024 if (local->sta_sw_scanning)
1025 chan = local->scan_channel;
1026 else
1027 chan = local->oper_channel;
1028
1029 local->hw.conf.channel = chan;
1030
1031 if (!local->hw.conf.power_level)
1032 local->hw.conf.power_level = chan->max_power;
1033 else
1034 local->hw.conf.power_level = min(chan->max_power,
1035 local->hw.conf.power_level);
1036
1037 local->hw.conf.max_antenna_gain = chan->max_antenna_gain;
1038
1039 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1040 printk(KERN_DEBUG "%s: HW CONFIG: freq=%d\n",
1041 wiphy_name(local->hw.wiphy), chan->center_freq);
1042 #endif
1043
1044 if (local->open_count)
1045 ret = local->ops->config(local_to_hw(local), &local->hw.conf);
1046
1047 return ret;
1048 }
1049
1050 /**
1051 * ieee80211_handle_ht should be used only after legacy configuration
1052 * has been determined namely band, as ht configuration depends upon
1053 * the hardware's HT abilities for a _specific_ band.
1054 */
1055 u32 ieee80211_handle_ht(struct ieee80211_local *local, int enable_ht,
1056 struct ieee80211_ht_info *req_ht_cap,
1057 struct ieee80211_ht_bss_info *req_bss_cap)
1058 {
1059 struct ieee80211_conf *conf = &local->hw.conf;
1060 struct ieee80211_supported_band *sband;
1061 struct ieee80211_ht_info ht_conf;
1062 struct ieee80211_ht_bss_info ht_bss_conf;
1063 u32 changed = 0;
1064 int i;
1065 u8 max_tx_streams = IEEE80211_HT_CAP_MAX_STREAMS;
1066 u8 tx_mcs_set_cap;
1067
1068 sband = local->hw.wiphy->bands[conf->channel->band];
1069
1070 memset(&ht_conf, 0, sizeof(struct ieee80211_ht_info));
1071 memset(&ht_bss_conf, 0, sizeof(struct ieee80211_ht_bss_info));
1072
1073 /* HT is not supported */
1074 if (!sband->ht_info.ht_supported) {
1075 conf->flags &= ~IEEE80211_CONF_SUPPORT_HT_MODE;
1076 goto out;
1077 }
1078
1079 /* disable HT */
1080 if (!enable_ht) {
1081 if (conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE)
1082 changed |= BSS_CHANGED_HT;
1083 conf->flags &= ~IEEE80211_CONF_SUPPORT_HT_MODE;
1084 conf->ht_conf.ht_supported = 0;
1085 goto out;
1086 }
1087
1088
1089 if (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE))
1090 changed |= BSS_CHANGED_HT;
1091
1092 conf->flags |= IEEE80211_CONF_SUPPORT_HT_MODE;
1093 ht_conf.ht_supported = 1;
1094
1095 ht_conf.cap = req_ht_cap->cap & sband->ht_info.cap;
1096 ht_conf.cap &= ~(IEEE80211_HT_CAP_MIMO_PS);
1097 ht_conf.cap |= sband->ht_info.cap & IEEE80211_HT_CAP_MIMO_PS;
1098 ht_bss_conf.primary_channel = req_bss_cap->primary_channel;
1099 ht_bss_conf.bss_cap = req_bss_cap->bss_cap;
1100 ht_bss_conf.bss_op_mode = req_bss_cap->bss_op_mode;
1101
1102 ht_conf.ampdu_factor = req_ht_cap->ampdu_factor;
1103 ht_conf.ampdu_density = req_ht_cap->ampdu_density;
1104
1105 /* Bits 96-100 */
1106 tx_mcs_set_cap = sband->ht_info.supp_mcs_set[12];
1107
1108 /* configure suppoerted Tx MCS according to requested MCS
1109 * (based in most cases on Rx capabilities of peer) and self
1110 * Tx MCS capabilities (as defined by low level driver HW
1111 * Tx capabilities) */
1112 if (!(tx_mcs_set_cap & IEEE80211_HT_CAP_MCS_TX_DEFINED))
1113 goto check_changed;
1114
1115 /* Counting from 0 therfore + 1 */
1116 if (tx_mcs_set_cap & IEEE80211_HT_CAP_MCS_TX_RX_DIFF)
1117 max_tx_streams = ((tx_mcs_set_cap &
1118 IEEE80211_HT_CAP_MCS_TX_STREAMS) >> 2) + 1;
1119
1120 for (i = 0; i < max_tx_streams; i++)
1121 ht_conf.supp_mcs_set[i] =
1122 sband->ht_info.supp_mcs_set[i] &
1123 req_ht_cap->supp_mcs_set[i];
1124
1125 if (tx_mcs_set_cap & IEEE80211_HT_CAP_MCS_TX_UEQM)
1126 for (i = IEEE80211_SUPP_MCS_SET_UEQM;
1127 i < IEEE80211_SUPP_MCS_SET_LEN; 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 check_changed:
1133 /* if bss configuration changed store the new one */
1134 if (memcmp(&conf->ht_conf, &ht_conf, sizeof(ht_conf)) ||
1135 memcmp(&conf->ht_bss_conf, &ht_bss_conf, sizeof(ht_bss_conf))) {
1136 changed |= BSS_CHANGED_HT;
1137 memcpy(&conf->ht_conf, &ht_conf, sizeof(ht_conf));
1138 memcpy(&conf->ht_bss_conf, &ht_bss_conf, sizeof(ht_bss_conf));
1139 }
1140 out:
1141 return changed;
1142 }
1143
1144 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
1145 u32 changed)
1146 {
1147 struct ieee80211_local *local = sdata->local;
1148
1149 if (!changed)
1150 return;
1151
1152 if (local->ops->bss_info_changed)
1153 local->ops->bss_info_changed(local_to_hw(local),
1154 &sdata->vif,
1155 &sdata->bss_conf,
1156 changed);
1157 }
1158
1159 u32 ieee80211_reset_erp_info(struct net_device *dev)
1160 {
1161 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1162
1163 sdata->bss_conf.use_cts_prot = 0;
1164 sdata->bss_conf.use_short_preamble = 0;
1165 return BSS_CHANGED_ERP_CTS_PROT | BSS_CHANGED_ERP_PREAMBLE;
1166 }
1167
1168 void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
1169 struct sk_buff *skb)
1170 {
1171 struct ieee80211_local *local = hw_to_local(hw);
1172 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1173 int tmp;
1174
1175 skb->dev = local->mdev;
1176 skb->pkt_type = IEEE80211_TX_STATUS_MSG;
1177 skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ?
1178 &local->skb_queue : &local->skb_queue_unreliable, skb);
1179 tmp = skb_queue_len(&local->skb_queue) +
1180 skb_queue_len(&local->skb_queue_unreliable);
1181 while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
1182 (skb = skb_dequeue(&local->skb_queue_unreliable))) {
1183 dev_kfree_skb_irq(skb);
1184 tmp--;
1185 I802_DEBUG_INC(local->tx_status_drop);
1186 }
1187 tasklet_schedule(&local->tasklet);
1188 }
1189 EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
1190
1191 static void ieee80211_tasklet_handler(unsigned long data)
1192 {
1193 struct ieee80211_local *local = (struct ieee80211_local *) data;
1194 struct sk_buff *skb;
1195 struct ieee80211_rx_status rx_status;
1196 struct ieee80211_ra_tid *ra_tid;
1197
1198 while ((skb = skb_dequeue(&local->skb_queue)) ||
1199 (skb = skb_dequeue(&local->skb_queue_unreliable))) {
1200 switch (skb->pkt_type) {
1201 case IEEE80211_RX_MSG:
1202 /* status is in skb->cb */
1203 memcpy(&rx_status, skb->cb, sizeof(rx_status));
1204 /* Clear skb->pkt_type in order to not confuse kernel
1205 * netstack. */
1206 skb->pkt_type = 0;
1207 __ieee80211_rx(local_to_hw(local), skb, &rx_status);
1208 break;
1209 case IEEE80211_TX_STATUS_MSG:
1210 skb->pkt_type = 0;
1211 ieee80211_tx_status(local_to_hw(local), skb);
1212 break;
1213 case IEEE80211_DELBA_MSG:
1214 ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
1215 ieee80211_stop_tx_ba_cb(local_to_hw(local),
1216 ra_tid->ra, ra_tid->tid);
1217 dev_kfree_skb(skb);
1218 break;
1219 case IEEE80211_ADDBA_MSG:
1220 ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
1221 ieee80211_start_tx_ba_cb(local_to_hw(local),
1222 ra_tid->ra, ra_tid->tid);
1223 dev_kfree_skb(skb);
1224 break ;
1225 default:
1226 WARN_ON(1);
1227 dev_kfree_skb(skb);
1228 break;
1229 }
1230 }
1231 }
1232
1233 /* Remove added headers (e.g., QoS control), encryption header/MIC, etc. to
1234 * make a prepared TX frame (one that has been given to hw) to look like brand
1235 * new IEEE 802.11 frame that is ready to go through TX processing again.
1236 * Also, tx_packet_data in cb is restored from tx_control. */
1237 static void ieee80211_remove_tx_extra(struct ieee80211_local *local,
1238 struct ieee80211_key *key,
1239 struct sk_buff *skb)
1240 {
1241 int hdrlen, iv_len, mic_len;
1242 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1243
1244 info->flags &= IEEE80211_TX_CTL_REQ_TX_STATUS |
1245 IEEE80211_TX_CTL_DO_NOT_ENCRYPT |
1246 IEEE80211_TX_CTL_REQUEUE |
1247 IEEE80211_TX_CTL_EAPOL_FRAME;
1248
1249 hdrlen = ieee80211_get_hdrlen_from_skb(skb);
1250
1251 if (!key)
1252 goto no_key;
1253
1254 switch (key->conf.alg) {
1255 case ALG_WEP:
1256 iv_len = WEP_IV_LEN;
1257 mic_len = WEP_ICV_LEN;
1258 break;
1259 case ALG_TKIP:
1260 iv_len = TKIP_IV_LEN;
1261 mic_len = TKIP_ICV_LEN;
1262 break;
1263 case ALG_CCMP:
1264 iv_len = CCMP_HDR_LEN;
1265 mic_len = CCMP_MIC_LEN;
1266 break;
1267 default:
1268 goto no_key;
1269 }
1270
1271 if (skb->len >= mic_len &&
1272 !(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
1273 skb_trim(skb, skb->len - mic_len);
1274 if (skb->len >= iv_len && skb->len > hdrlen) {
1275 memmove(skb->data + iv_len, skb->data, hdrlen);
1276 skb_pull(skb, iv_len);
1277 }
1278
1279 no_key:
1280 {
1281 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1282 u16 fc = le16_to_cpu(hdr->frame_control);
1283 if ((fc & 0x8C) == 0x88) /* QoS Control Field */ {
1284 fc &= ~IEEE80211_STYPE_QOS_DATA;
1285 hdr->frame_control = cpu_to_le16(fc);
1286 memmove(skb->data + 2, skb->data, hdrlen - 2);
1287 skb_pull(skb, 2);
1288 }
1289 }
1290 }
1291
1292 static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
1293 struct sta_info *sta,
1294 struct sk_buff *skb)
1295 {
1296 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1297
1298 sta->tx_filtered_count++;
1299
1300 /*
1301 * Clear the TX filter mask for this STA when sending the next
1302 * packet. If the STA went to power save mode, this will happen
1303 * when it wakes up for the next time.
1304 */
1305 set_sta_flags(sta, WLAN_STA_CLEAR_PS_FILT);
1306
1307 /*
1308 * This code races in the following way:
1309 *
1310 * (1) STA sends frame indicating it will go to sleep and does so
1311 * (2) hardware/firmware adds STA to filter list, passes frame up
1312 * (3) hardware/firmware processes TX fifo and suppresses a frame
1313 * (4) we get TX status before having processed the frame and
1314 * knowing that the STA has gone to sleep.
1315 *
1316 * This is actually quite unlikely even when both those events are
1317 * processed from interrupts coming in quickly after one another or
1318 * even at the same time because we queue both TX status events and
1319 * RX frames to be processed by a tasklet and process them in the
1320 * same order that they were received or TX status last. Hence, there
1321 * is no race as long as the frame RX is processed before the next TX
1322 * status, which drivers can ensure, see below.
1323 *
1324 * Note that this can only happen if the hardware or firmware can
1325 * actually add STAs to the filter list, if this is done by the
1326 * driver in response to set_tim() (which will only reduce the race
1327 * this whole filtering tries to solve, not completely solve it)
1328 * this situation cannot happen.
1329 *
1330 * To completely solve this race drivers need to make sure that they
1331 * (a) don't mix the irq-safe/not irq-safe TX status/RX processing
1332 * functions and
1333 * (b) always process RX events before TX status events if ordering
1334 * can be unknown, for example with different interrupt status
1335 * bits.
1336 */
1337 if (test_sta_flags(sta, WLAN_STA_PS) &&
1338 skb_queue_len(&sta->tx_filtered) < STA_MAX_TX_BUFFER) {
1339 ieee80211_remove_tx_extra(local, sta->key, skb);
1340 skb_queue_tail(&sta->tx_filtered, skb);
1341 return;
1342 }
1343
1344 if (!test_sta_flags(sta, WLAN_STA_PS) &&
1345 !(info->flags & IEEE80211_TX_CTL_REQUEUE)) {
1346 /* Software retry the packet once */
1347 info->flags |= IEEE80211_TX_CTL_REQUEUE;
1348 ieee80211_remove_tx_extra(local, sta->key, skb);
1349 dev_queue_xmit(skb);
1350 return;
1351 }
1352
1353 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1354 if (net_ratelimit())
1355 printk(KERN_DEBUG "%s: dropped TX filtered frame, "
1356 "queue_len=%d PS=%d @%lu\n",
1357 wiphy_name(local->hw.wiphy),
1358 skb_queue_len(&sta->tx_filtered),
1359 !!test_sta_flags(sta, WLAN_STA_PS), jiffies);
1360 #endif
1361 dev_kfree_skb(skb);
1362 }
1363
1364 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
1365 {
1366 struct sk_buff *skb2;
1367 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1368 struct ieee80211_local *local = hw_to_local(hw);
1369 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1370 u16 frag, type;
1371 __le16 fc;
1372 struct ieee80211_tx_status_rtap_hdr *rthdr;
1373 struct ieee80211_sub_if_data *sdata;
1374 struct net_device *prev_dev = NULL;
1375 struct sta_info *sta;
1376
1377 rcu_read_lock();
1378
1379 if (info->status.excessive_retries) {
1380 sta = sta_info_get(local, hdr->addr1);
1381 if (sta) {
1382 if (test_sta_flags(sta, WLAN_STA_PS)) {
1383 /*
1384 * The STA is in power save mode, so assume
1385 * that this TX packet failed because of that.
1386 */
1387 ieee80211_handle_filtered_frame(local, sta, skb);
1388 rcu_read_unlock();
1389 return;
1390 }
1391 }
1392 }
1393
1394 fc = hdr->frame_control;
1395
1396 if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
1397 (ieee80211_is_data_qos(fc))) {
1398 u16 tid, ssn;
1399 u8 *qc;
1400 sta = sta_info_get(local, hdr->addr1);
1401 if (sta) {
1402 qc = ieee80211_get_qos_ctl(hdr);
1403 tid = qc[0] & 0xf;
1404 ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
1405 & IEEE80211_SCTL_SEQ);
1406 ieee80211_send_bar(sta->sdata->dev, hdr->addr1,
1407 tid, ssn);
1408 }
1409 }
1410
1411 if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
1412 sta = sta_info_get(local, hdr->addr1);
1413 if (sta) {
1414 ieee80211_handle_filtered_frame(local, sta, skb);
1415 rcu_read_unlock();
1416 return;
1417 }
1418 } else
1419 rate_control_tx_status(local->mdev, skb);
1420
1421 rcu_read_unlock();
1422
1423 ieee80211_led_tx(local, 0);
1424
1425 /* SNMP counters
1426 * Fragments are passed to low-level drivers as separate skbs, so these
1427 * are actually fragments, not frames. Update frame counters only for
1428 * the first fragment of the frame. */
1429
1430 frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG;
1431 type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE;
1432
1433 if (info->flags & IEEE80211_TX_STAT_ACK) {
1434 if (frag == 0) {
1435 local->dot11TransmittedFrameCount++;
1436 if (is_multicast_ether_addr(hdr->addr1))
1437 local->dot11MulticastTransmittedFrameCount++;
1438 if (info->status.retry_count > 0)
1439 local->dot11RetryCount++;
1440 if (info->status.retry_count > 1)
1441 local->dot11MultipleRetryCount++;
1442 }
1443
1444 /* This counter shall be incremented for an acknowledged MPDU
1445 * with an individual address in the address 1 field or an MPDU
1446 * with a multicast address in the address 1 field of type Data
1447 * or Management. */
1448 if (!is_multicast_ether_addr(hdr->addr1) ||
1449 type == IEEE80211_FTYPE_DATA ||
1450 type == IEEE80211_FTYPE_MGMT)
1451 local->dot11TransmittedFragmentCount++;
1452 } else {
1453 if (frag == 0)
1454 local->dot11FailedCount++;
1455 }
1456
1457 /* this was a transmitted frame, but now we want to reuse it */
1458 skb_orphan(skb);
1459
1460 /*
1461 * This is a bit racy but we can avoid a lot of work
1462 * with this test...
1463 */
1464 if (!local->monitors && !local->cooked_mntrs) {
1465 dev_kfree_skb(skb);
1466 return;
1467 }
1468
1469 /* send frame to monitor interfaces now */
1470
1471 if (skb_headroom(skb) < sizeof(*rthdr)) {
1472 printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
1473 dev_kfree_skb(skb);
1474 return;
1475 }
1476
1477 rthdr = (struct ieee80211_tx_status_rtap_hdr *)
1478 skb_push(skb, sizeof(*rthdr));
1479
1480 memset(rthdr, 0, sizeof(*rthdr));
1481 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
1482 rthdr->hdr.it_present =
1483 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
1484 (1 << IEEE80211_RADIOTAP_DATA_RETRIES));
1485
1486 if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
1487 !is_multicast_ether_addr(hdr->addr1))
1488 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL);
1489
1490 if ((info->flags & IEEE80211_TX_CTL_USE_RTS_CTS) &&
1491 (info->flags & IEEE80211_TX_CTL_USE_CTS_PROTECT))
1492 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS);
1493 else if (info->flags & IEEE80211_TX_CTL_USE_RTS_CTS)
1494 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS);
1495
1496 rthdr->data_retries = info->status.retry_count;
1497
1498 /* XXX: is this sufficient for BPF? */
1499 skb_set_mac_header(skb, 0);
1500 skb->ip_summed = CHECKSUM_UNNECESSARY;
1501 skb->pkt_type = PACKET_OTHERHOST;
1502 skb->protocol = htons(ETH_P_802_2);
1503 memset(skb->cb, 0, sizeof(skb->cb));
1504
1505 rcu_read_lock();
1506 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
1507 if (sdata->vif.type == IEEE80211_IF_TYPE_MNTR) {
1508 if (!netif_running(sdata->dev))
1509 continue;
1510
1511 if (prev_dev) {
1512 skb2 = skb_clone(skb, GFP_ATOMIC);
1513 if (skb2) {
1514 skb2->dev = prev_dev;
1515 netif_rx(skb2);
1516 }
1517 }
1518
1519 prev_dev = sdata->dev;
1520 }
1521 }
1522 if (prev_dev) {
1523 skb->dev = prev_dev;
1524 netif_rx(skb);
1525 skb = NULL;
1526 }
1527 rcu_read_unlock();
1528 dev_kfree_skb(skb);
1529 }
1530 EXPORT_SYMBOL(ieee80211_tx_status);
1531
1532 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
1533 const struct ieee80211_ops *ops)
1534 {
1535 struct ieee80211_local *local;
1536 int priv_size;
1537 struct wiphy *wiphy;
1538
1539 /* Ensure 32-byte alignment of our private data and hw private data.
1540 * We use the wiphy priv data for both our ieee80211_local and for
1541 * the driver's private data
1542 *
1543 * In memory it'll be like this:
1544 *
1545 * +-------------------------+
1546 * | struct wiphy |
1547 * +-------------------------+
1548 * | struct ieee80211_local |
1549 * +-------------------------+
1550 * | driver's private data |
1551 * +-------------------------+
1552 *
1553 */
1554 priv_size = ((sizeof(struct ieee80211_local) +
1555 NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST) +
1556 priv_data_len;
1557
1558 wiphy = wiphy_new(&mac80211_config_ops, priv_size);
1559
1560 if (!wiphy)
1561 return NULL;
1562
1563 wiphy->privid = mac80211_wiphy_privid;
1564
1565 local = wiphy_priv(wiphy);
1566 local->hw.wiphy = wiphy;
1567
1568 local->hw.priv = (char *)local +
1569 ((sizeof(struct ieee80211_local) +
1570 NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);
1571
1572 BUG_ON(!ops->tx);
1573 BUG_ON(!ops->start);
1574 BUG_ON(!ops->stop);
1575 BUG_ON(!ops->config);
1576 BUG_ON(!ops->add_interface);
1577 BUG_ON(!ops->remove_interface);
1578 BUG_ON(!ops->configure_filter);
1579 local->ops = ops;
1580
1581 local->hw.queues = 1; /* default */
1582
1583 local->bridge_packets = 1;
1584
1585 local->rts_threshold = IEEE80211_MAX_RTS_THRESHOLD;
1586 local->fragmentation_threshold = IEEE80211_MAX_FRAG_THRESHOLD;
1587 local->short_retry_limit = 7;
1588 local->long_retry_limit = 4;
1589 local->hw.conf.radio_enabled = 1;
1590
1591 INIT_LIST_HEAD(&local->interfaces);
1592
1593 spin_lock_init(&local->key_lock);
1594
1595 INIT_DELAYED_WORK(&local->scan_work, ieee80211_sta_scan_work);
1596
1597 sta_info_init(local);
1598
1599 tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
1600 (unsigned long)local);
1601 tasklet_disable(&local->tx_pending_tasklet);
1602
1603 tasklet_init(&local->tasklet,
1604 ieee80211_tasklet_handler,
1605 (unsigned long) local);
1606 tasklet_disable(&local->tasklet);
1607
1608 skb_queue_head_init(&local->skb_queue);
1609 skb_queue_head_init(&local->skb_queue_unreliable);
1610
1611 return local_to_hw(local);
1612 }
1613 EXPORT_SYMBOL(ieee80211_alloc_hw);
1614
1615 int ieee80211_register_hw(struct ieee80211_hw *hw)
1616 {
1617 struct ieee80211_local *local = hw_to_local(hw);
1618 const char *name;
1619 int result;
1620 enum ieee80211_band band;
1621 struct net_device *mdev;
1622 struct wireless_dev *mwdev;
1623
1624 /*
1625 * generic code guarantees at least one band,
1626 * set this very early because much code assumes
1627 * that hw.conf.channel is assigned
1628 */
1629 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1630 struct ieee80211_supported_band *sband;
1631
1632 sband = local->hw.wiphy->bands[band];
1633 if (sband) {
1634 /* init channel we're on */
1635 local->hw.conf.channel =
1636 local->oper_channel =
1637 local->scan_channel = &sband->channels[0];
1638 break;
1639 }
1640 }
1641
1642 result = wiphy_register(local->hw.wiphy);
1643 if (result < 0)
1644 return result;
1645
1646 /*
1647 * We use the number of queues for feature tests (QoS, HT) internally
1648 * so restrict them appropriately.
1649 */
1650 if (hw->queues > IEEE80211_MAX_QUEUES)
1651 hw->queues = IEEE80211_MAX_QUEUES;
1652 if (hw->ampdu_queues > IEEE80211_MAX_AMPDU_QUEUES)
1653 hw->ampdu_queues = IEEE80211_MAX_AMPDU_QUEUES;
1654 if (hw->queues < 4)
1655 hw->ampdu_queues = 0;
1656
1657 mdev = alloc_netdev_mq(sizeof(struct wireless_dev),
1658 "wmaster%d", ether_setup,
1659 ieee80211_num_queues(hw));
1660 if (!mdev)
1661 goto fail_mdev_alloc;
1662
1663 mwdev = netdev_priv(mdev);
1664 mdev->ieee80211_ptr = mwdev;
1665 mwdev->wiphy = local->hw.wiphy;
1666
1667 local->mdev = mdev;
1668
1669 ieee80211_rx_bss_list_init(local);
1670
1671 mdev->hard_start_xmit = ieee80211_master_start_xmit;
1672 mdev->open = ieee80211_master_open;
1673 mdev->stop = ieee80211_master_stop;
1674 mdev->type = ARPHRD_IEEE80211;
1675 mdev->header_ops = &ieee80211_header_ops;
1676 mdev->set_multicast_list = ieee80211_master_set_multicast_list;
1677
1678 name = wiphy_dev(local->hw.wiphy)->driver->name;
1679 local->hw.workqueue = create_freezeable_workqueue(name);
1680 if (!local->hw.workqueue) {
1681 result = -ENOMEM;
1682 goto fail_workqueue;
1683 }
1684
1685 /*
1686 * The hardware needs headroom for sending the frame,
1687 * and we need some headroom for passing the frame to monitor
1688 * interfaces, but never both at the same time.
1689 */
1690 local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
1691 sizeof(struct ieee80211_tx_status_rtap_hdr));
1692
1693 debugfs_hw_add(local);
1694
1695 if (local->hw.conf.beacon_int < 10)
1696 local->hw.conf.beacon_int = 100;
1697
1698 local->wstats_flags |= local->hw.flags & (IEEE80211_HW_SIGNAL_UNSPEC |
1699 IEEE80211_HW_SIGNAL_DB |
1700 IEEE80211_HW_SIGNAL_DBM) ?
1701 IW_QUAL_QUAL_UPDATED : IW_QUAL_QUAL_INVALID;
1702 local->wstats_flags |= local->hw.flags & IEEE80211_HW_NOISE_DBM ?
1703 IW_QUAL_NOISE_UPDATED : IW_QUAL_NOISE_INVALID;
1704 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
1705 local->wstats_flags |= IW_QUAL_DBM;
1706
1707 result = sta_info_start(local);
1708 if (result < 0)
1709 goto fail_sta_info;
1710
1711 rtnl_lock();
1712 result = dev_alloc_name(local->mdev, local->mdev->name);
1713 if (result < 0)
1714 goto fail_dev;
1715
1716 memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1717 SET_NETDEV_DEV(local->mdev, wiphy_dev(local->hw.wiphy));
1718
1719 result = register_netdevice(local->mdev);
1720 if (result < 0)
1721 goto fail_dev;
1722
1723 result = ieee80211_init_rate_ctrl_alg(local,
1724 hw->rate_control_algorithm);
1725 if (result < 0) {
1726 printk(KERN_DEBUG "%s: Failed to initialize rate control "
1727 "algorithm\n", wiphy_name(local->hw.wiphy));
1728 goto fail_rate;
1729 }
1730
1731 result = ieee80211_wep_init(local);
1732
1733 if (result < 0) {
1734 printk(KERN_DEBUG "%s: Failed to initialize wep\n",
1735 wiphy_name(local->hw.wiphy));
1736 goto fail_wep;
1737 }
1738
1739 local->mdev->select_queue = ieee80211_select_queue;
1740
1741 /* add one default STA interface */
1742 result = ieee80211_if_add(local, "wlan%d", NULL,
1743 IEEE80211_IF_TYPE_STA, NULL);
1744 if (result)
1745 printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
1746 wiphy_name(local->hw.wiphy));
1747
1748 rtnl_unlock();
1749
1750 ieee80211_led_init(local);
1751
1752 return 0;
1753
1754 fail_wep:
1755 rate_control_deinitialize(local);
1756 fail_rate:
1757 unregister_netdevice(local->mdev);
1758 local->mdev = NULL;
1759 fail_dev:
1760 rtnl_unlock();
1761 sta_info_stop(local);
1762 fail_sta_info:
1763 debugfs_hw_del(local);
1764 destroy_workqueue(local->hw.workqueue);
1765 fail_workqueue:
1766 if (local->mdev)
1767 free_netdev(local->mdev);
1768 fail_mdev_alloc:
1769 wiphy_unregister(local->hw.wiphy);
1770 return result;
1771 }
1772 EXPORT_SYMBOL(ieee80211_register_hw);
1773
1774 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
1775 {
1776 struct ieee80211_local *local = hw_to_local(hw);
1777
1778 tasklet_kill(&local->tx_pending_tasklet);
1779 tasklet_kill(&local->tasklet);
1780
1781 rtnl_lock();
1782
1783 /*
1784 * At this point, interface list manipulations are fine
1785 * because the driver cannot be handing us frames any
1786 * more and the tasklet is killed.
1787 */
1788
1789 /* First, we remove all virtual interfaces. */
1790 ieee80211_remove_interfaces(local);
1791
1792 /* then, finally, remove the master interface */
1793 unregister_netdevice(local->mdev);
1794
1795 rtnl_unlock();
1796
1797 ieee80211_rx_bss_list_deinit(local);
1798 ieee80211_clear_tx_pending(local);
1799 sta_info_stop(local);
1800 rate_control_deinitialize(local);
1801 debugfs_hw_del(local);
1802
1803 if (skb_queue_len(&local->skb_queue)
1804 || skb_queue_len(&local->skb_queue_unreliable))
1805 printk(KERN_WARNING "%s: skb_queue not empty\n",
1806 wiphy_name(local->hw.wiphy));
1807 skb_queue_purge(&local->skb_queue);
1808 skb_queue_purge(&local->skb_queue_unreliable);
1809
1810 destroy_workqueue(local->hw.workqueue);
1811 wiphy_unregister(local->hw.wiphy);
1812 ieee80211_wep_free(local);
1813 ieee80211_led_exit(local);
1814 free_netdev(local->mdev);
1815 }
1816 EXPORT_SYMBOL(ieee80211_unregister_hw);
1817
1818 void ieee80211_free_hw(struct ieee80211_hw *hw)
1819 {
1820 struct ieee80211_local *local = hw_to_local(hw);
1821
1822 wiphy_free(local->hw.wiphy);
1823 }
1824 EXPORT_SYMBOL(ieee80211_free_hw);
1825
1826 static int __init ieee80211_init(void)
1827 {
1828 struct sk_buff *skb;
1829 int ret;
1830
1831 BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1832 BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1833 IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1834
1835 ret = rc80211_pid_init();
1836 if (ret)
1837 return ret;
1838
1839 ieee80211_debugfs_netdev_init();
1840
1841 return 0;
1842 }
1843
1844 static void __exit ieee80211_exit(void)
1845 {
1846 rc80211_pid_exit();
1847
1848 /*
1849 * For key todo, it'll be empty by now but the work
1850 * might still be scheduled.
1851 */
1852 flush_scheduled_work();
1853
1854 if (mesh_allocated)
1855 ieee80211s_stop();
1856
1857 ieee80211_debugfs_netdev_exit();
1858 }
1859
1860
1861 subsys_initcall(ieee80211_init);
1862 module_exit(ieee80211_exit);
1863
1864 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1865 MODULE_LICENSE("GPL");
Support for the Chinese Samsung S3C2440 based development boards