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mac80211: make workqueue freezable
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / mac80211 / main.c
blobb661ee5bb8246534c42dee2ab2dba87a50d2b346
1 /*
2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 */
10
11 #include <net/mac80211.h>
12 #include <net/ieee80211_radiotap.h>
13 #include <linux/module.h>
14 #include <linux/init.h>
15 #include <linux/netdevice.h>
16 #include <linux/types.h>
17 #include <linux/slab.h>
18 #include <linux/skbuff.h>
19 #include <linux/etherdevice.h>
20 #include <linux/if_arp.h>
21 #include <linux/wireless.h>
22 #include <linux/rtnetlink.h>
23 #include <linux/bitmap.h>
24 #include <net/net_namespace.h>
25 #include <net/cfg80211.h>
26
27 #include "ieee80211_i.h"
28 #include "rate.h"
29 #include "mesh.h"
30 #include "wep.h"
31 #include "wme.h"
32 #include "aes_ccm.h"
33 #include "led.h"
34 #include "cfg.h"
35 #include "debugfs.h"
36 #include "debugfs_netdev.h"
37
38 /*
39 * For seeing transmitted packets on monitor interfaces
40 * we have a radiotap header too.
41 */
42 struct ieee80211_tx_status_rtap_hdr {
43 struct ieee80211_radiotap_header hdr;
44 __le16 tx_flags;
45 u8 data_retries;
46 } __attribute__ ((packed));
47
48 /* common interface routines */
49
50 static int header_parse_80211(const struct sk_buff *skb, unsigned char *haddr)
51 {
52 memcpy(haddr, skb_mac_header(skb) + 10, ETH_ALEN); /* addr2 */
53 return ETH_ALEN;
54 }
55
56 /* must be called under mdev tx lock */
57 static void ieee80211_configure_filter(struct ieee80211_local *local)
58 {
59 unsigned int changed_flags;
60 unsigned int new_flags = 0;
61
62 if (atomic_read(&local->iff_promiscs))
63 new_flags |= FIF_PROMISC_IN_BSS;
64
65 if (atomic_read(&local->iff_allmultis))
66 new_flags |= FIF_ALLMULTI;
67
68 if (local->monitors)
69 new_flags |= FIF_BCN_PRBRESP_PROMISC;
70
71 if (local->fif_fcsfail)
72 new_flags |= FIF_FCSFAIL;
73
74 if (local->fif_plcpfail)
75 new_flags |= FIF_PLCPFAIL;
76
77 if (local->fif_control)
78 new_flags |= FIF_CONTROL;
79
80 if (local->fif_other_bss)
81 new_flags |= FIF_OTHER_BSS;
82
83 changed_flags = local->filter_flags ^ new_flags;
84
85 /* be a bit nasty */
86 new_flags |= (1<<31);
87
88 local->ops->configure_filter(local_to_hw(local),
89 changed_flags, &new_flags,
90 local->mdev->mc_count,
91 local->mdev->mc_list);
92
93 WARN_ON(new_flags & (1<<31));
94
95 local->filter_flags = new_flags & ~(1<<31);
96 }
97
98 /* master interface */
99
100 static int ieee80211_master_open(struct net_device *dev)
101 {
102 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
103 struct ieee80211_sub_if_data *sdata;
104 int res = -EOPNOTSUPP;
105
106 /* we hold the RTNL here so can safely walk the list */
107 list_for_each_entry(sdata, &local->interfaces, list) {
108 if (sdata->dev != dev && netif_running(sdata->dev)) {
109 res = 0;
110 break;
111 }
112 }
113
114 if (res)
115 return res;
116
117 netif_start_queue(local->mdev);
118
119 return 0;
120 }
121
122 static int ieee80211_master_stop(struct net_device *dev)
123 {
124 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
125 struct ieee80211_sub_if_data *sdata;
126
127 /* we hold the RTNL here so can safely walk the list */
128 list_for_each_entry(sdata, &local->interfaces, list)
129 if (sdata->dev != dev && netif_running(sdata->dev))
130 dev_close(sdata->dev);
131
132 return 0;
133 }
134
135 static void ieee80211_master_set_multicast_list(struct net_device *dev)
136 {
137 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
138
139 ieee80211_configure_filter(local);
140 }
141
142 /* regular interfaces */
143
144 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
145 {
146 int meshhdrlen;
147 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
148
149 meshhdrlen = (sdata->vif.type == IEEE80211_IF_TYPE_MESH_POINT) ? 5 : 0;
150
151 /* FIX: what would be proper limits for MTU?
152 * This interface uses 802.3 frames. */
153 if (new_mtu < 256 ||
154 new_mtu > IEEE80211_MAX_DATA_LEN - 24 - 6 - meshhdrlen) {
155 printk(KERN_WARNING "%s: invalid MTU %d\n",
156 dev->name, new_mtu);
157 return -EINVAL;
158 }
159
160 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
161 printk(KERN_DEBUG "%s: setting MTU %d\n", dev->name, new_mtu);
162 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
163 dev->mtu = new_mtu;
164 return 0;
165 }
166
167 static inline int identical_mac_addr_allowed(int type1, int type2)
168 {
169 return (type1 == IEEE80211_IF_TYPE_MNTR ||
170 type2 == IEEE80211_IF_TYPE_MNTR ||
171 (type1 == IEEE80211_IF_TYPE_AP &&
172 type2 == IEEE80211_IF_TYPE_WDS) ||
173 (type1 == IEEE80211_IF_TYPE_WDS &&
174 (type2 == IEEE80211_IF_TYPE_WDS ||
175 type2 == IEEE80211_IF_TYPE_AP)) ||
176 (type1 == IEEE80211_IF_TYPE_AP &&
177 type2 == IEEE80211_IF_TYPE_VLAN) ||
178 (type1 == IEEE80211_IF_TYPE_VLAN &&
179 (type2 == IEEE80211_IF_TYPE_AP ||
180 type2 == IEEE80211_IF_TYPE_VLAN)));
181 }
182
183 static int ieee80211_open(struct net_device *dev)
184 {
185 struct ieee80211_sub_if_data *sdata, *nsdata;
186 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
187 struct ieee80211_if_init_conf conf;
188 int res;
189 bool need_hw_reconfig = 0;
190 struct sta_info *sta;
191
192 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
193
194 /* we hold the RTNL here so can safely walk the list */
195 list_for_each_entry(nsdata, &local->interfaces, list) {
196 struct net_device *ndev = nsdata->dev;
197
198 if (ndev != dev && ndev != local->mdev && netif_running(ndev)) {
199 /*
200 * Allow only a single IBSS interface to be up at any
201 * time. This is restricted because beacon distribution
202 * cannot work properly if both are in the same IBSS.
203 *
204 * To remove this restriction we'd have to disallow them
205 * from setting the same SSID on different IBSS interfaces
206 * belonging to the same hardware. Then, however, we're
207 * faced with having to adopt two different TSF timers...
208 */
209 if (sdata->vif.type == IEEE80211_IF_TYPE_IBSS &&
210 nsdata->vif.type == IEEE80211_IF_TYPE_IBSS)
211 return -EBUSY;
212
213 /*
214 * Disallow multiple IBSS/STA mode interfaces.
215 *
216 * This is a technical restriction, it is possible although
217 * most likely not IEEE 802.11 compliant to have multiple
218 * STAs with just a single hardware (the TSF timer will not
219 * be adjusted properly.)
220 *
221 * However, because mac80211 uses the master device's BSS
222 * information for each STA/IBSS interface, doing this will
223 * currently corrupt that BSS information completely, unless,
224 * a not very useful case, both STAs are associated to the
225 * same BSS.
226 *
227 * To remove this restriction, the BSS information needs to
228 * be embedded in the STA/IBSS mode sdata instead of using
229 * the master device's BSS structure.
230 */
231 if ((sdata->vif.type == IEEE80211_IF_TYPE_STA ||
232 sdata->vif.type == IEEE80211_IF_TYPE_IBSS) &&
233 (nsdata->vif.type == IEEE80211_IF_TYPE_STA ||
234 nsdata->vif.type == IEEE80211_IF_TYPE_IBSS))
235 return -EBUSY;
236
237 /*
238 * The remaining checks are only performed for interfaces
239 * with the same MAC address.
240 */
241 if (compare_ether_addr(dev->dev_addr, ndev->dev_addr))
242 continue;
243
244 /*
245 * check whether it may have the same address
246 */
247 if (!identical_mac_addr_allowed(sdata->vif.type,
248 nsdata->vif.type))
249 return -ENOTUNIQ;
250
251 /*
252 * can only add VLANs to enabled APs
253 */
254 if (sdata->vif.type == IEEE80211_IF_TYPE_VLAN &&
255 nsdata->vif.type == IEEE80211_IF_TYPE_AP)
256 sdata->u.vlan.ap = nsdata;
257 }
258 }
259
260 switch (sdata->vif.type) {
261 case IEEE80211_IF_TYPE_WDS:
262 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
263 return -ENOLINK;
264 break;
265 case IEEE80211_IF_TYPE_VLAN:
266 if (!sdata->u.vlan.ap)
267 return -ENOLINK;
268 break;
269 case IEEE80211_IF_TYPE_AP:
270 case IEEE80211_IF_TYPE_STA:
271 case IEEE80211_IF_TYPE_MNTR:
272 case IEEE80211_IF_TYPE_IBSS:
273 case IEEE80211_IF_TYPE_MESH_POINT:
274 /* no special treatment */
275 break;
276 case IEEE80211_IF_TYPE_INVALID:
277 /* cannot happen */
278 WARN_ON(1);
279 break;
280 }
281
282 if (local->open_count == 0) {
283 res = 0;
284 if (local->ops->start)
285 res = local->ops->start(local_to_hw(local));
286 if (res)
287 return res;
288 need_hw_reconfig = 1;
289 ieee80211_led_radio(local, local->hw.conf.radio_enabled);
290 }
291
292 switch (sdata->vif.type) {
293 case IEEE80211_IF_TYPE_VLAN:
294 list_add(&sdata->u.vlan.list, &sdata->u.vlan.ap->u.ap.vlans);
295 /* no need to tell driver */
296 break;
297 case IEEE80211_IF_TYPE_MNTR:
298 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
299 local->cooked_mntrs++;
300 break;
301 }
302
303 /* must be before the call to ieee80211_configure_filter */
304 local->monitors++;
305 if (local->monitors == 1)
306 local->hw.conf.flags |= IEEE80211_CONF_RADIOTAP;
307
308 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
309 local->fif_fcsfail++;
310 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
311 local->fif_plcpfail++;
312 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL)
313 local->fif_control++;
314 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
315 local->fif_other_bss++;
316
317 netif_tx_lock_bh(local->mdev);
318 ieee80211_configure_filter(local);
319 netif_tx_unlock_bh(local->mdev);
320 break;
321 case IEEE80211_IF_TYPE_STA:
322 case IEEE80211_IF_TYPE_IBSS:
323 sdata->u.sta.flags &= ~IEEE80211_STA_PREV_BSSID_SET;
324 /* fall through */
325 default:
326 conf.vif = &sdata->vif;
327 conf.type = sdata->vif.type;
328 conf.mac_addr = dev->dev_addr;
329 res = local->ops->add_interface(local_to_hw(local), &conf);
330 if (res)
331 goto err_stop;
332
333 ieee80211_if_config(dev);
334 ieee80211_reset_erp_info(dev);
335 ieee80211_enable_keys(sdata);
336
337 if (sdata->vif.type == IEEE80211_IF_TYPE_STA &&
338 !(sdata->flags & IEEE80211_SDATA_USERSPACE_MLME))
339 netif_carrier_off(dev);
340 else
341 netif_carrier_on(dev);
342 }
343
344 if (sdata->vif.type == IEEE80211_IF_TYPE_WDS) {
345 /* Create STA entry for the WDS peer */
346 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
347 GFP_KERNEL);
348 if (!sta) {
349 res = -ENOMEM;
350 goto err_del_interface;
351 }
352
353 /* no locking required since STA is not live yet */
354 sta->flags |= WLAN_STA_AUTHORIZED;
355
356 res = sta_info_insert(sta);
357 if (res) {
358 /* STA has been freed */
359 goto err_del_interface;
360 }
361 }
362
363 if (local->open_count == 0) {
364 res = dev_open(local->mdev);
365 WARN_ON(res);
366 if (res)
367 goto err_del_interface;
368 tasklet_enable(&local->tx_pending_tasklet);
369 tasklet_enable(&local->tasklet);
370 }
371
372 /*
373 * set_multicast_list will be invoked by the networking core
374 * which will check whether any increments here were done in
375 * error and sync them down to the hardware as filter flags.
376 */
377 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
378 atomic_inc(&local->iff_allmultis);
379
380 if (sdata->flags & IEEE80211_SDATA_PROMISC)
381 atomic_inc(&local->iff_promiscs);
382
383 local->open_count++;
384 if (need_hw_reconfig)
385 ieee80211_hw_config(local);
386
387 /*
388 * ieee80211_sta_work is disabled while network interface
389 * is down. Therefore, some configuration changes may not
390 * yet be effective. Trigger execution of ieee80211_sta_work
391 * to fix this.
392 */
393 if (sdata->vif.type == IEEE80211_IF_TYPE_STA ||
394 sdata->vif.type == IEEE80211_IF_TYPE_IBSS) {
395 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
396 queue_work(local->hw.workqueue, &ifsta->work);
397 }
398
399 netif_start_queue(dev);
400
401 return 0;
402 err_del_interface:
403 local->ops->remove_interface(local_to_hw(local), &conf);
404 err_stop:
405 if (!local->open_count && local->ops->stop)
406 local->ops->stop(local_to_hw(local));
407 return res;
408 }
409
410 static int ieee80211_stop(struct net_device *dev)
411 {
412 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
413 struct ieee80211_local *local = sdata->local;
414 struct ieee80211_if_init_conf conf;
415 struct sta_info *sta;
416
417 /*
418 * Stop TX on this interface first.
419 */
420 netif_stop_queue(dev);
421
422 /*
423 * Now delete all active aggregation sessions.
424 */
425 rcu_read_lock();
426
427 list_for_each_entry_rcu(sta, &local->sta_list, list) {
428 if (sta->sdata == sdata)
429 ieee80211_sta_tear_down_BA_sessions(dev, sta->addr);
430 }
431
432 rcu_read_unlock();
433
434 /*
435 * Remove all stations associated with this interface.
436 *
437 * This must be done before calling ops->remove_interface()
438 * because otherwise we can later invoke ops->sta_notify()
439 * whenever the STAs are removed, and that invalidates driver
440 * assumptions about always getting a vif pointer that is valid
441 * (because if we remove a STA after ops->remove_interface()
442 * the driver will have removed the vif info already!)
443 *
444 * We could relax this and only unlink the stations from the
445 * hash table and list but keep them on a per-sdata list that
446 * will be inserted back again when the interface is brought
447 * up again, but I don't currently see a use case for that,
448 * except with WDS which gets a STA entry created when it is
449 * brought up.
450 */
451 sta_info_flush(local, sdata);
452
453 /*
454 * Don't count this interface for promisc/allmulti while it
455 * is down. dev_mc_unsync() will invoke set_multicast_list
456 * on the master interface which will sync these down to the
457 * hardware as filter flags.
458 */
459 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
460 atomic_dec(&local->iff_allmultis);
461
462 if (sdata->flags & IEEE80211_SDATA_PROMISC)
463 atomic_dec(&local->iff_promiscs);
464
465 dev_mc_unsync(local->mdev, dev);
466
467 /* APs need special treatment */
468 if (sdata->vif.type == IEEE80211_IF_TYPE_AP) {
469 struct ieee80211_sub_if_data *vlan, *tmp;
470 struct beacon_data *old_beacon = sdata->u.ap.beacon;
471
472 /* remove beacon */
473 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
474 synchronize_rcu();
475 kfree(old_beacon);
476
477 /* down all dependent devices, that is VLANs */
478 list_for_each_entry_safe(vlan, tmp, &sdata->u.ap.vlans,
479 u.vlan.list)
480 dev_close(vlan->dev);
481 WARN_ON(!list_empty(&sdata->u.ap.vlans));
482 }
483
484 local->open_count--;
485
486 switch (sdata->vif.type) {
487 case IEEE80211_IF_TYPE_VLAN:
488 list_del(&sdata->u.vlan.list);
489 sdata->u.vlan.ap = NULL;
490 /* no need to tell driver */
491 break;
492 case IEEE80211_IF_TYPE_MNTR:
493 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
494 local->cooked_mntrs--;
495 break;
496 }
497
498 local->monitors--;
499 if (local->monitors == 0)
500 local->hw.conf.flags &= ~IEEE80211_CONF_RADIOTAP;
501
502 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
503 local->fif_fcsfail--;
504 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
505 local->fif_plcpfail--;
506 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL)
507 local->fif_control--;
508 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
509 local->fif_other_bss--;
510
511 netif_tx_lock_bh(local->mdev);
512 ieee80211_configure_filter(local);
513 netif_tx_unlock_bh(local->mdev);
514 break;
515 case IEEE80211_IF_TYPE_MESH_POINT:
516 case IEEE80211_IF_TYPE_STA:
517 case IEEE80211_IF_TYPE_IBSS:
518 sdata->u.sta.state = IEEE80211_DISABLED;
519 memset(sdata->u.sta.bssid, 0, ETH_ALEN);
520 del_timer_sync(&sdata->u.sta.timer);
521 /*
522 * When we get here, the interface is marked down.
523 * Call synchronize_rcu() to wait for the RX path
524 * should it be using the interface and enqueuing
525 * frames at this very time on another CPU.
526 */
527 synchronize_rcu();
528 skb_queue_purge(&sdata->u.sta.skb_queue);
529
530 if (local->scan_dev == sdata->dev) {
531 if (!local->ops->hw_scan) {
532 local->sta_sw_scanning = 0;
533 cancel_delayed_work(&local->scan_work);
534 } else
535 local->sta_hw_scanning = 0;
536 }
537
538 flush_workqueue(local->hw.workqueue);
539
540 sdata->u.sta.flags &= ~IEEE80211_STA_PRIVACY_INVOKED;
541 kfree(sdata->u.sta.extra_ie);
542 sdata->u.sta.extra_ie = NULL;
543 sdata->u.sta.extra_ie_len = 0;
544 /* fall through */
545 default:
546 conf.vif = &sdata->vif;
547 conf.type = sdata->vif.type;
548 conf.mac_addr = dev->dev_addr;
549 /* disable all keys for as long as this netdev is down */
550 ieee80211_disable_keys(sdata);
551 local->ops->remove_interface(local_to_hw(local), &conf);
552 }
553
554 if (local->open_count == 0) {
555 if (netif_running(local->mdev))
556 dev_close(local->mdev);
557
558 if (local->ops->stop)
559 local->ops->stop(local_to_hw(local));
560
561 ieee80211_led_radio(local, 0);
562
563 tasklet_disable(&local->tx_pending_tasklet);
564 tasklet_disable(&local->tasklet);
565 }
566
567 return 0;
568 }
569
570 int ieee80211_start_tx_ba_session(struct ieee80211_hw *hw, u8 *ra, u16 tid)
571 {
572 struct ieee80211_local *local = hw_to_local(hw);
573 struct sta_info *sta;
574 struct ieee80211_sub_if_data *sdata;
575 u16 start_seq_num = 0;
576 u8 *state;
577 int ret;
578 DECLARE_MAC_BUF(mac);
579
580 if (tid >= STA_TID_NUM)
581 return -EINVAL;
582
583 #ifdef CONFIG_MAC80211_HT_DEBUG
584 printk(KERN_DEBUG "Open BA session requested for %s tid %u\n",
585 print_mac(mac, ra), tid);
586 #endif /* CONFIG_MAC80211_HT_DEBUG */
587
588 rcu_read_lock();
589
590 sta = sta_info_get(local, ra);
591 if (!sta) {
592 printk(KERN_DEBUG "Could not find the station\n");
593 ret = -ENOENT;
594 goto exit;
595 }
596
597 spin_lock_bh(&sta->lock);
598
599 /* we have tried too many times, receiver does not want A-MPDU */
600 if (sta->ampdu_mlme.addba_req_num[tid] > HT_AGG_MAX_RETRIES) {
601 ret = -EBUSY;
602 goto err_unlock_sta;
603 }
604
605 state = &sta->ampdu_mlme.tid_state_tx[tid];
606 /* check if the TID is not in aggregation flow already */
607 if (*state != HT_AGG_STATE_IDLE) {
608 #ifdef CONFIG_MAC80211_HT_DEBUG
609 printk(KERN_DEBUG "BA request denied - session is not "
610 "idle on tid %u\n", tid);
611 #endif /* CONFIG_MAC80211_HT_DEBUG */
612 ret = -EAGAIN;
613 goto err_unlock_sta;
614 }
615
616 /* prepare A-MPDU MLME for Tx aggregation */
617 sta->ampdu_mlme.tid_tx[tid] =
618 kmalloc(sizeof(struct tid_ampdu_tx), GFP_ATOMIC);
619 if (!sta->ampdu_mlme.tid_tx[tid]) {
620 if (net_ratelimit())
621 printk(KERN_ERR "allocate tx mlme to tid %d failed\n",
622 tid);
623 ret = -ENOMEM;
624 goto err_unlock_sta;
625 }
626 /* Tx timer */
627 sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.function =
628 sta_addba_resp_timer_expired;
629 sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.data =
630 (unsigned long)&sta->timer_to_tid[tid];
631 init_timer(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer);
632
633 /* ensure that TX flow won't interrupt us
634 * until the end of the call to requeue function */
635 spin_lock_bh(&local->mdev->queue_lock);
636
637 /* create a new queue for this aggregation */
638 ret = ieee80211_ht_agg_queue_add(local, sta, tid);
639
640 /* case no queue is available to aggregation
641 * don't switch to aggregation */
642 if (ret) {
643 #ifdef CONFIG_MAC80211_HT_DEBUG
644 printk(KERN_DEBUG "BA request denied - queue unavailable for"
645 " tid %d\n", tid);
646 #endif /* CONFIG_MAC80211_HT_DEBUG */
647 goto err_unlock_queue;
648 }
649 sdata = sta->sdata;
650
651 /* Ok, the Addba frame hasn't been sent yet, but if the driver calls the
652 * call back right away, it must see that the flow has begun */
653 *state |= HT_ADDBA_REQUESTED_MSK;
654
655 if (local->ops->ampdu_action)
656 ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_TX_START,
657 ra, tid, &start_seq_num);
658
659 if (ret) {
660 /* No need to requeue the packets in the agg queue, since we
661 * held the tx lock: no packet could be enqueued to the newly
662 * allocated queue */
663 ieee80211_ht_agg_queue_remove(local, sta, tid, 0);
664 #ifdef CONFIG_MAC80211_HT_DEBUG
665 printk(KERN_DEBUG "BA request denied - HW unavailable for"
666 " tid %d\n", tid);
667 #endif /* CONFIG_MAC80211_HT_DEBUG */
668 *state = HT_AGG_STATE_IDLE;
669 goto err_unlock_queue;
670 }
671
672 /* Will put all the packets in the new SW queue */
673 ieee80211_requeue(local, ieee802_1d_to_ac[tid]);
674 spin_unlock_bh(&local->mdev->queue_lock);
675 spin_unlock_bh(&sta->lock);
676
677 /* send an addBA request */
678 sta->ampdu_mlme.dialog_token_allocator++;
679 sta->ampdu_mlme.tid_tx[tid]->dialog_token =
680 sta->ampdu_mlme.dialog_token_allocator;
681 sta->ampdu_mlme.tid_tx[tid]->ssn = start_seq_num;
682
683
684 ieee80211_send_addba_request(sta->sdata->dev, ra, tid,
685 sta->ampdu_mlme.tid_tx[tid]->dialog_token,
686 sta->ampdu_mlme.tid_tx[tid]->ssn,
687 0x40, 5000);
688 /* activate the timer for the recipient's addBA response */
689 sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.expires =
690 jiffies + ADDBA_RESP_INTERVAL;
691 add_timer(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer);
692 printk(KERN_DEBUG "activated addBA response timer on tid %d\n", tid);
693 goto exit;
694
695 err_unlock_queue:
696 kfree(sta->ampdu_mlme.tid_tx[tid]);
697 sta->ampdu_mlme.tid_tx[tid] = NULL;
698 spin_unlock_bh(&local->mdev->queue_lock);
699 ret = -EBUSY;
700 err_unlock_sta:
701 spin_unlock_bh(&sta->lock);
702 exit:
703 rcu_read_unlock();
704 return ret;
705 }
706 EXPORT_SYMBOL(ieee80211_start_tx_ba_session);
707
708 int ieee80211_stop_tx_ba_session(struct ieee80211_hw *hw,
709 u8 *ra, u16 tid,
710 enum ieee80211_back_parties initiator)
711 {
712 struct ieee80211_local *local = hw_to_local(hw);
713 struct sta_info *sta;
714 u8 *state;
715 int ret = 0;
716 DECLARE_MAC_BUF(mac);
717
718 if (tid >= STA_TID_NUM)
719 return -EINVAL;
720
721 rcu_read_lock();
722 sta = sta_info_get(local, ra);
723 if (!sta) {
724 rcu_read_unlock();
725 return -ENOENT;
726 }
727
728 /* check if the TID is in aggregation */
729 state = &sta->ampdu_mlme.tid_state_tx[tid];
730 spin_lock_bh(&sta->lock);
731
732 if (*state != HT_AGG_STATE_OPERATIONAL) {
733 ret = -ENOENT;
734 goto stop_BA_exit;
735 }
736
737 #ifdef CONFIG_MAC80211_HT_DEBUG
738 printk(KERN_DEBUG "Tx BA session stop requested for %s tid %u\n",
739 print_mac(mac, ra), tid);
740 #endif /* CONFIG_MAC80211_HT_DEBUG */
741
742 ieee80211_stop_queue(hw, sta->tid_to_tx_q[tid]);
743
744 *state = HT_AGG_STATE_REQ_STOP_BA_MSK |
745 (initiator << HT_AGG_STATE_INITIATOR_SHIFT);
746
747 if (local->ops->ampdu_action)
748 ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_TX_STOP,
749 ra, tid, NULL);
750
751 /* case HW denied going back to legacy */
752 if (ret) {
753 WARN_ON(ret != -EBUSY);
754 *state = HT_AGG_STATE_OPERATIONAL;
755 ieee80211_wake_queue(hw, sta->tid_to_tx_q[tid]);
756 goto stop_BA_exit;
757 }
758
759 stop_BA_exit:
760 spin_unlock_bh(&sta->lock);
761 rcu_read_unlock();
762 return ret;
763 }
764 EXPORT_SYMBOL(ieee80211_stop_tx_ba_session);
765
766 void ieee80211_start_tx_ba_cb(struct ieee80211_hw *hw, u8 *ra, u16 tid)
767 {
768 struct ieee80211_local *local = hw_to_local(hw);
769 struct sta_info *sta;
770 u8 *state;
771 DECLARE_MAC_BUF(mac);
772
773 if (tid >= STA_TID_NUM) {
774 printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n",
775 tid, STA_TID_NUM);
776 return;
777 }
778
779 rcu_read_lock();
780 sta = sta_info_get(local, ra);
781 if (!sta) {
782 rcu_read_unlock();
783 printk(KERN_DEBUG "Could not find station: %s\n",
784 print_mac(mac, ra));
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 printk(KERN_DEBUG "addBA was not requested yet, state is %d\n",
793 *state);
794 spin_unlock_bh(&sta->lock);
795 rcu_read_unlock();
796 return;
797 }
798
799 WARN_ON_ONCE(*state & HT_ADDBA_DRV_READY_MSK);
800
801 *state |= HT_ADDBA_DRV_READY_MSK;
802
803 if (*state == HT_AGG_STATE_OPERATIONAL) {
804 printk(KERN_DEBUG "Aggregation is on for tid %d \n", tid);
805 ieee80211_wake_queue(hw, sta->tid_to_tx_q[tid]);
806 }
807 spin_unlock_bh(&sta->lock);
808 rcu_read_unlock();
809 }
810 EXPORT_SYMBOL(ieee80211_start_tx_ba_cb);
811
812 void ieee80211_stop_tx_ba_cb(struct ieee80211_hw *hw, u8 *ra, u8 tid)
813 {
814 struct ieee80211_local *local = hw_to_local(hw);
815 struct sta_info *sta;
816 u8 *state;
817 int agg_queue;
818 DECLARE_MAC_BUF(mac);
819
820 if (tid >= STA_TID_NUM) {
821 printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n",
822 tid, STA_TID_NUM);
823 return;
824 }
825
826 #ifdef CONFIG_MAC80211_HT_DEBUG
827 printk(KERN_DEBUG "Stopping Tx BA session for %s tid %d\n",
828 print_mac(mac, ra), tid);
829 #endif /* CONFIG_MAC80211_HT_DEBUG */
830
831 rcu_read_lock();
832 sta = sta_info_get(local, ra);
833 if (!sta) {
834 printk(KERN_DEBUG "Could not find station: %s\n",
835 print_mac(mac, ra));
836 rcu_read_unlock();
837 return;
838 }
839 state = &sta->ampdu_mlme.tid_state_tx[tid];
840
841 /* NOTE: no need to use sta->lock in this state check, as
842 * ieee80211_stop_tx_ba_session will let only
843 * one stop call to pass through per sta/tid */
844 if ((*state & HT_AGG_STATE_REQ_STOP_BA_MSK) == 0) {
845 printk(KERN_DEBUG "unexpected callback to A-MPDU stop\n");
846 rcu_read_unlock();
847 return;
848 }
849
850 if (*state & HT_AGG_STATE_INITIATOR_MSK)
851 ieee80211_send_delba(sta->sdata->dev, ra, tid,
852 WLAN_BACK_INITIATOR, WLAN_REASON_QSTA_NOT_USE);
853
854 agg_queue = sta->tid_to_tx_q[tid];
855
856 /* avoid ordering issues: we are the only one that can modify
857 * the content of the qdiscs */
858 spin_lock_bh(&local->mdev->queue_lock);
859 /* remove the queue for this aggregation */
860 ieee80211_ht_agg_queue_remove(local, sta, tid, 1);
861 spin_unlock_bh(&local->mdev->queue_lock);
862
863 /* we just requeued the all the frames that were in the removed
864 * queue, and since we might miss a softirq we do netif_schedule.
865 * ieee80211_wake_queue is not used here as this queue is not
866 * necessarily stopped */
867 netif_schedule(local->mdev);
868 spin_lock_bh(&sta->lock);
869 *state = HT_AGG_STATE_IDLE;
870 sta->ampdu_mlme.addba_req_num[tid] = 0;
871 kfree(sta->ampdu_mlme.tid_tx[tid]);
872 sta->ampdu_mlme.tid_tx[tid] = NULL;
873 spin_unlock_bh(&sta->lock);
874
875 rcu_read_unlock();
876 }
877 EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb);
878
879 void ieee80211_start_tx_ba_cb_irqsafe(struct ieee80211_hw *hw,
880 const u8 *ra, u16 tid)
881 {
882 struct ieee80211_local *local = hw_to_local(hw);
883 struct ieee80211_ra_tid *ra_tid;
884 struct sk_buff *skb = dev_alloc_skb(0);
885
886 if (unlikely(!skb)) {
887 if (net_ratelimit())
888 printk(KERN_WARNING "%s: Not enough memory, "
889 "dropping start BA session", skb->dev->name);
890 return;
891 }
892 ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
893 memcpy(&ra_tid->ra, ra, ETH_ALEN);
894 ra_tid->tid = tid;
895
896 skb->pkt_type = IEEE80211_ADDBA_MSG;
897 skb_queue_tail(&local->skb_queue, skb);
898 tasklet_schedule(&local->tasklet);
899 }
900 EXPORT_SYMBOL(ieee80211_start_tx_ba_cb_irqsafe);
901
902 void ieee80211_stop_tx_ba_cb_irqsafe(struct ieee80211_hw *hw,
903 const u8 *ra, u16 tid)
904 {
905 struct ieee80211_local *local = hw_to_local(hw);
906 struct ieee80211_ra_tid *ra_tid;
907 struct sk_buff *skb = dev_alloc_skb(0);
908
909 if (unlikely(!skb)) {
910 if (net_ratelimit())
911 printk(KERN_WARNING "%s: Not enough memory, "
912 "dropping stop BA session", skb->dev->name);
913 return;
914 }
915 ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
916 memcpy(&ra_tid->ra, ra, ETH_ALEN);
917 ra_tid->tid = tid;
918
919 skb->pkt_type = IEEE80211_DELBA_MSG;
920 skb_queue_tail(&local->skb_queue, skb);
921 tasklet_schedule(&local->tasklet);
922 }
923 EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb_irqsafe);
924
925 static void ieee80211_set_multicast_list(struct net_device *dev)
926 {
927 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
928 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
929 int allmulti, promisc, sdata_allmulti, sdata_promisc;
930
931 allmulti = !!(dev->flags & IFF_ALLMULTI);
932 promisc = !!(dev->flags & IFF_PROMISC);
933 sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
934 sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
935
936 if (allmulti != sdata_allmulti) {
937 if (dev->flags & IFF_ALLMULTI)
938 atomic_inc(&local->iff_allmultis);
939 else
940 atomic_dec(&local->iff_allmultis);
941 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
942 }
943
944 if (promisc != sdata_promisc) {
945 if (dev->flags & IFF_PROMISC)
946 atomic_inc(&local->iff_promiscs);
947 else
948 atomic_dec(&local->iff_promiscs);
949 sdata->flags ^= IEEE80211_SDATA_PROMISC;
950 }
951
952 dev_mc_sync(local->mdev, dev);
953 }
954
955 static const struct header_ops ieee80211_header_ops = {
956 .create = eth_header,
957 .parse = header_parse_80211,
958 .rebuild = eth_rebuild_header,
959 .cache = eth_header_cache,
960 .cache_update = eth_header_cache_update,
961 };
962
963 /* Must not be called for mdev */
964 void ieee80211_if_setup(struct net_device *dev)
965 {
966 ether_setup(dev);
967 dev->hard_start_xmit = ieee80211_subif_start_xmit;
968 dev->wireless_handlers = &ieee80211_iw_handler_def;
969 dev->set_multicast_list = ieee80211_set_multicast_list;
970 dev->change_mtu = ieee80211_change_mtu;
971 dev->open = ieee80211_open;
972 dev->stop = ieee80211_stop;
973 dev->destructor = ieee80211_if_free;
974 }
975
976 /* everything else */
977
978 static int __ieee80211_if_config(struct net_device *dev,
979 struct sk_buff *beacon)
980 {
981 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
982 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
983 struct ieee80211_if_conf conf;
984
985 if (!local->ops->config_interface || !netif_running(dev))
986 return 0;
987
988 memset(&conf, 0, sizeof(conf));
989 conf.type = sdata->vif.type;
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 (ieee80211_vif_is_mesh(&sdata->vif)) {
996 conf.beacon = beacon;
997 ieee80211_start_mesh(dev);
998 } else if (sdata->vif.type == IEEE80211_IF_TYPE_AP) {
999 conf.ssid = sdata->u.ap.ssid;
1000 conf.ssid_len = sdata->u.ap.ssid_len;
1001 conf.beacon = beacon;
1002 }
1003 return local->ops->config_interface(local_to_hw(local),
1004 &sdata->vif, &conf);
1005 }
1006
1007 int ieee80211_if_config(struct net_device *dev)
1008 {
1009 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1010 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1011 if (sdata->vif.type == IEEE80211_IF_TYPE_MESH_POINT &&
1012 (local->hw.flags & IEEE80211_HW_HOST_GEN_BEACON_TEMPLATE))
1013 return ieee80211_if_config_beacon(dev);
1014 return __ieee80211_if_config(dev, NULL);
1015 }
1016
1017 int ieee80211_if_config_beacon(struct net_device *dev)
1018 {
1019 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1020 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1021 struct sk_buff *skb;
1022
1023 if (!(local->hw.flags & IEEE80211_HW_HOST_GEN_BEACON_TEMPLATE))
1024 return 0;
1025 skb = ieee80211_beacon_get(local_to_hw(local), &sdata->vif);
1026 if (!skb)
1027 return -ENOMEM;
1028 return __ieee80211_if_config(dev, skb);
1029 }
1030
1031 int ieee80211_hw_config(struct ieee80211_local *local)
1032 {
1033 struct ieee80211_channel *chan;
1034 int ret = 0;
1035
1036 if (local->sta_sw_scanning)
1037 chan = local->scan_channel;
1038 else
1039 chan = local->oper_channel;
1040
1041 local->hw.conf.channel = chan;
1042
1043 if (!local->hw.conf.power_level)
1044 local->hw.conf.power_level = chan->max_power;
1045 else
1046 local->hw.conf.power_level = min(chan->max_power,
1047 local->hw.conf.power_level);
1048
1049 local->hw.conf.max_antenna_gain = chan->max_antenna_gain;
1050
1051 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1052 printk(KERN_DEBUG "%s: HW CONFIG: freq=%d\n",
1053 wiphy_name(local->hw.wiphy), chan->center_freq);
1054 #endif
1055
1056 if (local->open_count)
1057 ret = local->ops->config(local_to_hw(local), &local->hw.conf);
1058
1059 return ret;
1060 }
1061
1062 /**
1063 * ieee80211_handle_ht should be used only after legacy configuration
1064 * has been determined namely band, as ht configuration depends upon
1065 * the hardware's HT abilities for a _specific_ band.
1066 */
1067 u32 ieee80211_handle_ht(struct ieee80211_local *local, int enable_ht,
1068 struct ieee80211_ht_info *req_ht_cap,
1069 struct ieee80211_ht_bss_info *req_bss_cap)
1070 {
1071 struct ieee80211_conf *conf = &local->hw.conf;
1072 struct ieee80211_supported_band *sband;
1073 struct ieee80211_ht_info ht_conf;
1074 struct ieee80211_ht_bss_info ht_bss_conf;
1075 u32 changed = 0;
1076 int i;
1077 u8 max_tx_streams = IEEE80211_HT_CAP_MAX_STREAMS;
1078 u8 tx_mcs_set_cap;
1079
1080 sband = local->hw.wiphy->bands[conf->channel->band];
1081
1082 memset(&ht_conf, 0, sizeof(struct ieee80211_ht_info));
1083 memset(&ht_bss_conf, 0, sizeof(struct ieee80211_ht_bss_info));
1084
1085 /* HT is not supported */
1086 if (!sband->ht_info.ht_supported) {
1087 conf->flags &= ~IEEE80211_CONF_SUPPORT_HT_MODE;
1088 goto out;
1089 }
1090
1091 /* disable HT */
1092 if (!enable_ht) {
1093 if (conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE)
1094 changed |= BSS_CHANGED_HT;
1095 conf->flags &= ~IEEE80211_CONF_SUPPORT_HT_MODE;
1096 conf->ht_conf.ht_supported = 0;
1097 goto out;
1098 }
1099
1100
1101 if (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE))
1102 changed |= BSS_CHANGED_HT;
1103
1104 conf->flags |= IEEE80211_CONF_SUPPORT_HT_MODE;
1105 ht_conf.ht_supported = 1;
1106
1107 ht_conf.cap = req_ht_cap->cap & sband->ht_info.cap;
1108 ht_conf.cap &= ~(IEEE80211_HT_CAP_MIMO_PS);
1109 ht_conf.cap |= sband->ht_info.cap & IEEE80211_HT_CAP_MIMO_PS;
1110 ht_bss_conf.primary_channel = req_bss_cap->primary_channel;
1111 ht_bss_conf.bss_cap = req_bss_cap->bss_cap;
1112 ht_bss_conf.bss_op_mode = req_bss_cap->bss_op_mode;
1113
1114 ht_conf.ampdu_factor = req_ht_cap->ampdu_factor;
1115 ht_conf.ampdu_density = req_ht_cap->ampdu_density;
1116
1117 /* Bits 96-100 */
1118 tx_mcs_set_cap = sband->ht_info.supp_mcs_set[12];
1119
1120 /* configure suppoerted Tx MCS according to requested MCS
1121 * (based in most cases on Rx capabilities of peer) and self
1122 * Tx MCS capabilities (as defined by low level driver HW
1123 * Tx capabilities) */
1124 if (!(tx_mcs_set_cap & IEEE80211_HT_CAP_MCS_TX_DEFINED))
1125 goto check_changed;
1126
1127 /* Counting from 0 therfore + 1 */
1128 if (tx_mcs_set_cap & IEEE80211_HT_CAP_MCS_TX_RX_DIFF)
1129 max_tx_streams = ((tx_mcs_set_cap &
1130 IEEE80211_HT_CAP_MCS_TX_STREAMS) >> 2) + 1;
1131
1132 for (i = 0; i < max_tx_streams; i++)
1133 ht_conf.supp_mcs_set[i] =
1134 sband->ht_info.supp_mcs_set[i] &
1135 req_ht_cap->supp_mcs_set[i];
1136
1137 if (tx_mcs_set_cap & IEEE80211_HT_CAP_MCS_TX_UEQM)
1138 for (i = IEEE80211_SUPP_MCS_SET_UEQM;
1139 i < IEEE80211_SUPP_MCS_SET_LEN; i++)
1140 ht_conf.supp_mcs_set[i] =
1141 sband->ht_info.supp_mcs_set[i] &
1142 req_ht_cap->supp_mcs_set[i];
1143
1144 check_changed:
1145 /* if bss configuration changed store the new one */
1146 if (memcmp(&conf->ht_conf, &ht_conf, sizeof(ht_conf)) ||
1147 memcmp(&conf->ht_bss_conf, &ht_bss_conf, sizeof(ht_bss_conf))) {
1148 changed |= BSS_CHANGED_HT;
1149 memcpy(&conf->ht_conf, &ht_conf, sizeof(ht_conf));
1150 memcpy(&conf->ht_bss_conf, &ht_bss_conf, sizeof(ht_bss_conf));
1151 }
1152 out:
1153 return changed;
1154 }
1155
1156 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
1157 u32 changed)
1158 {
1159 struct ieee80211_local *local = sdata->local;
1160
1161 if (!changed)
1162 return;
1163
1164 if (local->ops->bss_info_changed)
1165 local->ops->bss_info_changed(local_to_hw(local),
1166 &sdata->vif,
1167 &sdata->bss_conf,
1168 changed);
1169 }
1170
1171 void ieee80211_reset_erp_info(struct net_device *dev)
1172 {
1173 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1174
1175 sdata->bss_conf.use_cts_prot = 0;
1176 sdata->bss_conf.use_short_preamble = 0;
1177 ieee80211_bss_info_change_notify(sdata,
1178 BSS_CHANGED_ERP_CTS_PROT |
1179 BSS_CHANGED_ERP_PREAMBLE);
1180 }
1181
1182 void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
1183 struct sk_buff *skb)
1184 {
1185 struct ieee80211_local *local = hw_to_local(hw);
1186 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1187 int tmp;
1188
1189 skb->dev = local->mdev;
1190 skb->pkt_type = IEEE80211_TX_STATUS_MSG;
1191 skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ?
1192 &local->skb_queue : &local->skb_queue_unreliable, skb);
1193 tmp = skb_queue_len(&local->skb_queue) +
1194 skb_queue_len(&local->skb_queue_unreliable);
1195 while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
1196 (skb = skb_dequeue(&local->skb_queue_unreliable))) {
1197 dev_kfree_skb_irq(skb);
1198 tmp--;
1199 I802_DEBUG_INC(local->tx_status_drop);
1200 }
1201 tasklet_schedule(&local->tasklet);
1202 }
1203 EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
1204
1205 static void ieee80211_tasklet_handler(unsigned long data)
1206 {
1207 struct ieee80211_local *local = (struct ieee80211_local *) data;
1208 struct sk_buff *skb;
1209 struct ieee80211_rx_status rx_status;
1210 struct ieee80211_ra_tid *ra_tid;
1211
1212 while ((skb = skb_dequeue(&local->skb_queue)) ||
1213 (skb = skb_dequeue(&local->skb_queue_unreliable))) {
1214 switch (skb->pkt_type) {
1215 case IEEE80211_RX_MSG:
1216 /* status is in skb->cb */
1217 memcpy(&rx_status, skb->cb, sizeof(rx_status));
1218 /* Clear skb->pkt_type in order to not confuse kernel
1219 * netstack. */
1220 skb->pkt_type = 0;
1221 __ieee80211_rx(local_to_hw(local), skb, &rx_status);
1222 break;
1223 case IEEE80211_TX_STATUS_MSG:
1224 skb->pkt_type = 0;
1225 ieee80211_tx_status(local_to_hw(local), skb);
1226 break;
1227 case IEEE80211_DELBA_MSG:
1228 ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
1229 ieee80211_stop_tx_ba_cb(local_to_hw(local),
1230 ra_tid->ra, ra_tid->tid);
1231 dev_kfree_skb(skb);
1232 break;
1233 case IEEE80211_ADDBA_MSG:
1234 ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
1235 ieee80211_start_tx_ba_cb(local_to_hw(local),
1236 ra_tid->ra, ra_tid->tid);
1237 dev_kfree_skb(skb);
1238 break ;
1239 default: /* should never get here! */
1240 printk(KERN_ERR "%s: Unknown message type (%d)\n",
1241 wiphy_name(local->hw.wiphy), skb->pkt_type);
1242 dev_kfree_skb(skb);
1243 break;
1244 }
1245 }
1246 }
1247
1248 /* Remove added headers (e.g., QoS control), encryption header/MIC, etc. to
1249 * make a prepared TX frame (one that has been given to hw) to look like brand
1250 * new IEEE 802.11 frame that is ready to go through TX processing again.
1251 * Also, tx_packet_data in cb is restored from tx_control. */
1252 static void ieee80211_remove_tx_extra(struct ieee80211_local *local,
1253 struct ieee80211_key *key,
1254 struct sk_buff *skb)
1255 {
1256 int hdrlen, iv_len, mic_len;
1257 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1258
1259 info->flags &= IEEE80211_TX_CTL_REQ_TX_STATUS |
1260 IEEE80211_TX_CTL_DO_NOT_ENCRYPT |
1261 IEEE80211_TX_CTL_REQUEUE |
1262 IEEE80211_TX_CTL_EAPOL_FRAME;
1263
1264 hdrlen = ieee80211_get_hdrlen_from_skb(skb);
1265
1266 if (!key)
1267 goto no_key;
1268
1269 switch (key->conf.alg) {
1270 case ALG_WEP:
1271 iv_len = WEP_IV_LEN;
1272 mic_len = WEP_ICV_LEN;
1273 break;
1274 case ALG_TKIP:
1275 iv_len = TKIP_IV_LEN;
1276 mic_len = TKIP_ICV_LEN;
1277 break;
1278 case ALG_CCMP:
1279 iv_len = CCMP_HDR_LEN;
1280 mic_len = CCMP_MIC_LEN;
1281 break;
1282 default:
1283 goto no_key;
1284 }
1285
1286 if (skb->len >= mic_len &&
1287 !(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
1288 skb_trim(skb, skb->len - mic_len);
1289 if (skb->len >= iv_len && skb->len > hdrlen) {
1290 memmove(skb->data + iv_len, skb->data, hdrlen);
1291 skb_pull(skb, iv_len);
1292 }
1293
1294 no_key:
1295 {
1296 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1297 u16 fc = le16_to_cpu(hdr->frame_control);
1298 if ((fc & 0x8C) == 0x88) /* QoS Control Field */ {
1299 fc &= ~IEEE80211_STYPE_QOS_DATA;
1300 hdr->frame_control = cpu_to_le16(fc);
1301 memmove(skb->data + 2, skb->data, hdrlen - 2);
1302 skb_pull(skb, 2);
1303 }
1304 }
1305 }
1306
1307 static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
1308 struct sta_info *sta,
1309 struct sk_buff *skb)
1310 {
1311 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1312
1313 sta->tx_filtered_count++;
1314
1315 /*
1316 * Clear the TX filter mask for this STA when sending the next
1317 * packet. If the STA went to power save mode, this will happen
1318 * when it wakes up for the next time.
1319 */
1320 set_sta_flags(sta, WLAN_STA_CLEAR_PS_FILT);
1321
1322 /*
1323 * This code races in the following way:
1324 *
1325 * (1) STA sends frame indicating it will go to sleep and does so
1326 * (2) hardware/firmware adds STA to filter list, passes frame up
1327 * (3) hardware/firmware processes TX fifo and suppresses a frame
1328 * (4) we get TX status before having processed the frame and
1329 * knowing that the STA has gone to sleep.
1330 *
1331 * This is actually quite unlikely even when both those events are
1332 * processed from interrupts coming in quickly after one another or
1333 * even at the same time because we queue both TX status events and
1334 * RX frames to be processed by a tasklet and process them in the
1335 * same order that they were received or TX status last. Hence, there
1336 * is no race as long as the frame RX is processed before the next TX
1337 * status, which drivers can ensure, see below.
1338 *
1339 * Note that this can only happen if the hardware or firmware can
1340 * actually add STAs to the filter list, if this is done by the
1341 * driver in response to set_tim() (which will only reduce the race
1342 * this whole filtering tries to solve, not completely solve it)
1343 * this situation cannot happen.
1344 *
1345 * To completely solve this race drivers need to make sure that they
1346 * (a) don't mix the irq-safe/not irq-safe TX status/RX processing
1347 * functions and
1348 * (b) always process RX events before TX status events if ordering
1349 * can be unknown, for example with different interrupt status
1350 * bits.
1351 */
1352 if (test_sta_flags(sta, WLAN_STA_PS) &&
1353 skb_queue_len(&sta->tx_filtered) < STA_MAX_TX_BUFFER) {
1354 ieee80211_remove_tx_extra(local, sta->key, skb);
1355 skb_queue_tail(&sta->tx_filtered, skb);
1356 return;
1357 }
1358
1359 if (!test_sta_flags(sta, WLAN_STA_PS) &&
1360 !(info->flags & IEEE80211_TX_CTL_REQUEUE)) {
1361 /* Software retry the packet once */
1362 info->flags |= IEEE80211_TX_CTL_REQUEUE;
1363 ieee80211_remove_tx_extra(local, sta->key, skb);
1364 dev_queue_xmit(skb);
1365 return;
1366 }
1367
1368 if (net_ratelimit())
1369 printk(KERN_DEBUG "%s: dropped TX filtered frame, "
1370 "queue_len=%d PS=%d @%lu\n",
1371 wiphy_name(local->hw.wiphy),
1372 skb_queue_len(&sta->tx_filtered),
1373 !!test_sta_flags(sta, WLAN_STA_PS), jiffies);
1374 dev_kfree_skb(skb);
1375 }
1376
1377 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
1378 {
1379 struct sk_buff *skb2;
1380 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1381 struct ieee80211_local *local = hw_to_local(hw);
1382 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1383 u16 frag, type;
1384 struct ieee80211_tx_status_rtap_hdr *rthdr;
1385 struct ieee80211_sub_if_data *sdata;
1386 struct net_device *prev_dev = NULL;
1387
1388 rcu_read_lock();
1389
1390 if (info->status.excessive_retries) {
1391 struct sta_info *sta;
1392 sta = sta_info_get(local, hdr->addr1);
1393 if (sta) {
1394 if (test_sta_flags(sta, WLAN_STA_PS)) {
1395 /*
1396 * The STA is in power save mode, so assume
1397 * that this TX packet failed because of that.
1398 */
1399 ieee80211_handle_filtered_frame(local, sta, skb);
1400 rcu_read_unlock();
1401 return;
1402 }
1403 }
1404 }
1405
1406 if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
1407 struct sta_info *sta;
1408 sta = sta_info_get(local, hdr->addr1);
1409 if (sta) {
1410 ieee80211_handle_filtered_frame(local, sta, skb);
1411 rcu_read_unlock();
1412 return;
1413 }
1414 } else
1415 rate_control_tx_status(local->mdev, skb);
1416
1417 rcu_read_unlock();
1418
1419 ieee80211_led_tx(local, 0);
1420
1421 /* SNMP counters
1422 * Fragments are passed to low-level drivers as separate skbs, so these
1423 * are actually fragments, not frames. Update frame counters only for
1424 * the first fragment of the frame. */
1425
1426 frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG;
1427 type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE;
1428
1429 if (info->flags & IEEE80211_TX_STAT_ACK) {
1430 if (frag == 0) {
1431 local->dot11TransmittedFrameCount++;
1432 if (is_multicast_ether_addr(hdr->addr1))
1433 local->dot11MulticastTransmittedFrameCount++;
1434 if (info->status.retry_count > 0)
1435 local->dot11RetryCount++;
1436 if (info->status.retry_count > 1)
1437 local->dot11MultipleRetryCount++;
1438 }
1439
1440 /* This counter shall be incremented for an acknowledged MPDU
1441 * with an individual address in the address 1 field or an MPDU
1442 * with a multicast address in the address 1 field of type Data
1443 * or Management. */
1444 if (!is_multicast_ether_addr(hdr->addr1) ||
1445 type == IEEE80211_FTYPE_DATA ||
1446 type == IEEE80211_FTYPE_MGMT)
1447 local->dot11TransmittedFragmentCount++;
1448 } else {
1449 if (frag == 0)
1450 local->dot11FailedCount++;
1451 }
1452
1453 /* this was a transmitted frame, but now we want to reuse it */
1454 skb_orphan(skb);
1455
1456 /*
1457 * This is a bit racy but we can avoid a lot of work
1458 * with this test...
1459 */
1460 if (!local->monitors && !local->cooked_mntrs) {
1461 dev_kfree_skb(skb);
1462 return;
1463 }
1464
1465 /* send frame to monitor interfaces now */
1466
1467 if (skb_headroom(skb) < sizeof(*rthdr)) {
1468 printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
1469 dev_kfree_skb(skb);
1470 return;
1471 }
1472
1473 rthdr = (struct ieee80211_tx_status_rtap_hdr *)
1474 skb_push(skb, sizeof(*rthdr));
1475
1476 memset(rthdr, 0, sizeof(*rthdr));
1477 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
1478 rthdr->hdr.it_present =
1479 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
1480 (1 << IEEE80211_RADIOTAP_DATA_RETRIES));
1481
1482 if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
1483 !is_multicast_ether_addr(hdr->addr1))
1484 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL);
1485
1486 if ((info->flags & IEEE80211_TX_CTL_USE_RTS_CTS) &&
1487 (info->flags & IEEE80211_TX_CTL_USE_CTS_PROTECT))
1488 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS);
1489 else if (info->flags & IEEE80211_TX_CTL_USE_RTS_CTS)
1490 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS);
1491
1492 rthdr->data_retries = info->status.retry_count;
1493
1494 /* XXX: is this sufficient for BPF? */
1495 skb_set_mac_header(skb, 0);
1496 skb->ip_summed = CHECKSUM_UNNECESSARY;
1497 skb->pkt_type = PACKET_OTHERHOST;
1498 skb->protocol = htons(ETH_P_802_2);
1499 memset(skb->cb, 0, sizeof(skb->cb));
1500
1501 rcu_read_lock();
1502 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
1503 if (sdata->vif.type == IEEE80211_IF_TYPE_MNTR) {
1504 if (!netif_running(sdata->dev))
1505 continue;
1506
1507 if (prev_dev) {
1508 skb2 = skb_clone(skb, GFP_ATOMIC);
1509 if (skb2) {
1510 skb2->dev = prev_dev;
1511 netif_rx(skb2);
1512 }
1513 }
1514
1515 prev_dev = sdata->dev;
1516 }
1517 }
1518 if (prev_dev) {
1519 skb->dev = prev_dev;
1520 netif_rx(skb);
1521 skb = NULL;
1522 }
1523 rcu_read_unlock();
1524 dev_kfree_skb(skb);
1525 }
1526 EXPORT_SYMBOL(ieee80211_tx_status);
1527
1528 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
1529 const struct ieee80211_ops *ops)
1530 {
1531 struct ieee80211_local *local;
1532 int priv_size;
1533 struct wiphy *wiphy;
1534
1535 /* Ensure 32-byte alignment of our private data and hw private data.
1536 * We use the wiphy priv data for both our ieee80211_local and for
1537 * the driver's private data
1538 *
1539 * In memory it'll be like this:
1540 *
1541 * +-------------------------+
1542 * | struct wiphy |
1543 * +-------------------------+
1544 * | struct ieee80211_local |
1545 * +-------------------------+
1546 * | driver's private data |
1547 * +-------------------------+
1548 *
1549 */
1550 priv_size = ((sizeof(struct ieee80211_local) +
1551 NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST) +
1552 priv_data_len;
1553
1554 wiphy = wiphy_new(&mac80211_config_ops, priv_size);
1555
1556 if (!wiphy)
1557 return NULL;
1558
1559 wiphy->privid = mac80211_wiphy_privid;
1560
1561 local = wiphy_priv(wiphy);
1562 local->hw.wiphy = wiphy;
1563
1564 local->hw.priv = (char *)local +
1565 ((sizeof(struct ieee80211_local) +
1566 NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);
1567
1568 BUG_ON(!ops->tx);
1569 BUG_ON(!ops->start);
1570 BUG_ON(!ops->stop);
1571 BUG_ON(!ops->config);
1572 BUG_ON(!ops->add_interface);
1573 BUG_ON(!ops->remove_interface);
1574 BUG_ON(!ops->configure_filter);
1575 local->ops = ops;
1576
1577 local->hw.queues = 1; /* default */
1578
1579 local->bridge_packets = 1;
1580
1581 local->rts_threshold = IEEE80211_MAX_RTS_THRESHOLD;
1582 local->fragmentation_threshold = IEEE80211_MAX_FRAG_THRESHOLD;
1583 local->short_retry_limit = 7;
1584 local->long_retry_limit = 4;
1585 local->hw.conf.radio_enabled = 1;
1586
1587 INIT_LIST_HEAD(&local->interfaces);
1588
1589 spin_lock_init(&local->key_lock);
1590
1591 INIT_DELAYED_WORK(&local->scan_work, ieee80211_sta_scan_work);
1592
1593 sta_info_init(local);
1594
1595 tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
1596 (unsigned long)local);
1597 tasklet_disable(&local->tx_pending_tasklet);
1598
1599 tasklet_init(&local->tasklet,
1600 ieee80211_tasklet_handler,
1601 (unsigned long) local);
1602 tasklet_disable(&local->tasklet);
1603
1604 skb_queue_head_init(&local->skb_queue);
1605 skb_queue_head_init(&local->skb_queue_unreliable);
1606
1607 return local_to_hw(local);
1608 }
1609 EXPORT_SYMBOL(ieee80211_alloc_hw);
1610
1611 int ieee80211_register_hw(struct ieee80211_hw *hw)
1612 {
1613 struct ieee80211_local *local = hw_to_local(hw);
1614 const char *name;
1615 int result;
1616 enum ieee80211_band band;
1617 struct net_device *mdev;
1618 struct ieee80211_sub_if_data *sdata;
1619
1620 /*
1621 * generic code guarantees at least one band,
1622 * set this very early because much code assumes
1623 * that hw.conf.channel is assigned
1624 */
1625 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1626 struct ieee80211_supported_band *sband;
1627
1628 sband = local->hw.wiphy->bands[band];
1629 if (sband) {
1630 /* init channel we're on */
1631 local->hw.conf.channel =
1632 local->oper_channel =
1633 local->scan_channel = &sband->channels[0];
1634 break;
1635 }
1636 }
1637
1638 result = wiphy_register(local->hw.wiphy);
1639 if (result < 0)
1640 return result;
1641
1642 /*
1643 * We use the number of queues for feature tests (QoS, HT) internally
1644 * so restrict them appropriately.
1645 */
1646 #ifdef CONFIG_MAC80211_QOS
1647 if (hw->queues > IEEE80211_MAX_QUEUES)
1648 hw->queues = IEEE80211_MAX_QUEUES;
1649 if (hw->ampdu_queues > IEEE80211_MAX_AMPDU_QUEUES)
1650 hw->ampdu_queues = IEEE80211_MAX_AMPDU_QUEUES;
1651 if (hw->queues < 4)
1652 hw->ampdu_queues = 0;
1653 #else
1654 hw->queues = 1;
1655 hw->ampdu_queues = 0;
1656 #endif
1657
1658 /* for now, mdev needs sub_if_data :/ */
1659 mdev = alloc_netdev_mq(sizeof(struct ieee80211_sub_if_data),
1660 "wmaster%d", ether_setup,
1661 ieee80211_num_queues(hw));
1662 if (!mdev)
1663 goto fail_mdev_alloc;
1664
1665 if (ieee80211_num_queues(hw) > 1)
1666 mdev->features |= NETIF_F_MULTI_QUEUE;
1667
1668 sdata = IEEE80211_DEV_TO_SUB_IF(mdev);
1669 mdev->ieee80211_ptr = &sdata->wdev;
1670 sdata->wdev.wiphy = local->hw.wiphy;
1671
1672 local->mdev = mdev;
1673
1674 ieee80211_rx_bss_list_init(mdev);
1675
1676 mdev->hard_start_xmit = ieee80211_master_start_xmit;
1677 mdev->open = ieee80211_master_open;
1678 mdev->stop = ieee80211_master_stop;
1679 mdev->type = ARPHRD_IEEE80211;
1680 mdev->header_ops = &ieee80211_header_ops;
1681 mdev->set_multicast_list = ieee80211_master_set_multicast_list;
1682
1683 sdata->vif.type = IEEE80211_IF_TYPE_AP;
1684 sdata->dev = mdev;
1685 sdata->local = local;
1686 sdata->u.ap.force_unicast_rateidx = -1;
1687 sdata->u.ap.max_ratectrl_rateidx = -1;
1688 ieee80211_if_sdata_init(sdata);
1689
1690 /* no RCU needed since we're still during init phase */
1691 list_add_tail(&sdata->list, &local->interfaces);
1692
1693 name = wiphy_dev(local->hw.wiphy)->driver->name;
1694 local->hw.workqueue = create_freezeable_workqueue(name);
1695 if (!local->hw.workqueue) {
1696 result = -ENOMEM;
1697 goto fail_workqueue;
1698 }
1699
1700 /*
1701 * The hardware needs headroom for sending the frame,
1702 * and we need some headroom for passing the frame to monitor
1703 * interfaces, but never both at the same time.
1704 */
1705 local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
1706 sizeof(struct ieee80211_tx_status_rtap_hdr));
1707
1708 debugfs_hw_add(local);
1709
1710 if (local->hw.conf.beacon_int < 10)
1711 local->hw.conf.beacon_int = 100;
1712
1713 local->wstats_flags |= local->hw.flags & (IEEE80211_HW_SIGNAL_UNSPEC |
1714 IEEE80211_HW_SIGNAL_DB |
1715 IEEE80211_HW_SIGNAL_DBM) ?
1716 IW_QUAL_QUAL_UPDATED : IW_QUAL_QUAL_INVALID;
1717 local->wstats_flags |= local->hw.flags & IEEE80211_HW_NOISE_DBM ?
1718 IW_QUAL_NOISE_UPDATED : IW_QUAL_NOISE_INVALID;
1719 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
1720 local->wstats_flags |= IW_QUAL_DBM;
1721
1722 result = sta_info_start(local);
1723 if (result < 0)
1724 goto fail_sta_info;
1725
1726 rtnl_lock();
1727 result = dev_alloc_name(local->mdev, local->mdev->name);
1728 if (result < 0)
1729 goto fail_dev;
1730
1731 memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1732 SET_NETDEV_DEV(local->mdev, wiphy_dev(local->hw.wiphy));
1733
1734 result = register_netdevice(local->mdev);
1735 if (result < 0)
1736 goto fail_dev;
1737
1738 ieee80211_debugfs_add_netdev(IEEE80211_DEV_TO_SUB_IF(local->mdev));
1739 ieee80211_if_set_type(local->mdev, IEEE80211_IF_TYPE_AP);
1740
1741 result = ieee80211_init_rate_ctrl_alg(local,
1742 hw->rate_control_algorithm);
1743 if (result < 0) {
1744 printk(KERN_DEBUG "%s: Failed to initialize rate control "
1745 "algorithm\n", wiphy_name(local->hw.wiphy));
1746 goto fail_rate;
1747 }
1748
1749 result = ieee80211_wep_init(local);
1750
1751 if (result < 0) {
1752 printk(KERN_DEBUG "%s: Failed to initialize wep\n",
1753 wiphy_name(local->hw.wiphy));
1754 goto fail_wep;
1755 }
1756
1757 ieee80211_install_qdisc(local->mdev);
1758
1759 /* add one default STA interface */
1760 result = ieee80211_if_add(local->mdev, "wlan%d", NULL,
1761 IEEE80211_IF_TYPE_STA, NULL);
1762 if (result)
1763 printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
1764 wiphy_name(local->hw.wiphy));
1765
1766 local->reg_state = IEEE80211_DEV_REGISTERED;
1767 rtnl_unlock();
1768
1769 ieee80211_led_init(local);
1770
1771 return 0;
1772
1773 fail_wep:
1774 rate_control_deinitialize(local);
1775 fail_rate:
1776 ieee80211_debugfs_remove_netdev(IEEE80211_DEV_TO_SUB_IF(local->mdev));
1777 unregister_netdevice(local->mdev);
1778 local->mdev = NULL;
1779 fail_dev:
1780 rtnl_unlock();
1781 sta_info_stop(local);
1782 fail_sta_info:
1783 debugfs_hw_del(local);
1784 destroy_workqueue(local->hw.workqueue);
1785 fail_workqueue:
1786 if (local->mdev != NULL) {
1787 ieee80211_if_free(local->mdev);
1788 local->mdev = NULL;
1789 }
1790 fail_mdev_alloc:
1791 wiphy_unregister(local->hw.wiphy);
1792 return result;
1793 }
1794 EXPORT_SYMBOL(ieee80211_register_hw);
1795
1796 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
1797 {
1798 struct ieee80211_local *local = hw_to_local(hw);
1799 struct ieee80211_sub_if_data *sdata, *tmp;
1800
1801 tasklet_kill(&local->tx_pending_tasklet);
1802 tasklet_kill(&local->tasklet);
1803
1804 rtnl_lock();
1805
1806 BUG_ON(local->reg_state != IEEE80211_DEV_REGISTERED);
1807
1808 local->reg_state = IEEE80211_DEV_UNREGISTERED;
1809
1810 /*
1811 * At this point, interface list manipulations are fine
1812 * because the driver cannot be handing us frames any
1813 * more and the tasklet is killed.
1814 */
1815
1816 /*
1817 * First, we remove all non-master interfaces. Do this because they
1818 * may have bss pointer dependency on the master, and when we free
1819 * the master these would be freed as well, breaking our list
1820 * iteration completely.
1821 */
1822 list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1823 if (sdata->dev == local->mdev)
1824 continue;
1825 list_del(&sdata->list);
1826 __ieee80211_if_del(local, sdata);
1827 }
1828
1829 /* then, finally, remove the master interface */
1830 __ieee80211_if_del(local, IEEE80211_DEV_TO_SUB_IF(local->mdev));
1831
1832 rtnl_unlock();
1833
1834 ieee80211_rx_bss_list_deinit(local->mdev);
1835 ieee80211_clear_tx_pending(local);
1836 sta_info_stop(local);
1837 rate_control_deinitialize(local);
1838 debugfs_hw_del(local);
1839
1840 if (skb_queue_len(&local->skb_queue)
1841 || skb_queue_len(&local->skb_queue_unreliable))
1842 printk(KERN_WARNING "%s: skb_queue not empty\n",
1843 wiphy_name(local->hw.wiphy));
1844 skb_queue_purge(&local->skb_queue);
1845 skb_queue_purge(&local->skb_queue_unreliable);
1846
1847 destroy_workqueue(local->hw.workqueue);
1848 wiphy_unregister(local->hw.wiphy);
1849 ieee80211_wep_free(local);
1850 ieee80211_led_exit(local);
1851 ieee80211_if_free(local->mdev);
1852 local->mdev = NULL;
1853 }
1854 EXPORT_SYMBOL(ieee80211_unregister_hw);
1855
1856 void ieee80211_free_hw(struct ieee80211_hw *hw)
1857 {
1858 struct ieee80211_local *local = hw_to_local(hw);
1859
1860 wiphy_free(local->hw.wiphy);
1861 }
1862 EXPORT_SYMBOL(ieee80211_free_hw);
1863
1864 static int __init ieee80211_init(void)
1865 {
1866 struct sk_buff *skb;
1867 int ret;
1868
1869 BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1870 BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1871 IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1872
1873 ret = rc80211_pid_init();
1874 if (ret)
1875 goto out;
1876
1877 ret = ieee80211_wme_register();
1878 if (ret) {
1879 printk(KERN_DEBUG "ieee80211_init: failed to "
1880 "initialize WME (err=%d)\n", ret);
1881 goto out_cleanup_pid;
1882 }
1883
1884 ieee80211_debugfs_netdev_init();
1885
1886 return 0;
1887
1888 out_cleanup_pid:
1889 rc80211_pid_exit();
1890 out:
1891 return ret;
1892 }
1893
1894 static void __exit ieee80211_exit(void)
1895 {
1896 rc80211_pid_exit();
1897
1898 /*
1899 * For key todo, it'll be empty by now but the work
1900 * might still be scheduled.
1901 */
1902 flush_scheduled_work();
1903
1904 if (mesh_allocated)
1905 ieee80211s_stop();
1906
1907 ieee80211_wme_unregister();
1908 ieee80211_debugfs_netdev_exit();
1909 }
1910
1911
1912 subsys_initcall(ieee80211_init);
1913 module_exit(ieee80211_exit);
1914
1915 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1916 MODULE_LICENSE("GPL");
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree