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mac80211: QoS related cleanups
[linux-2.6/verdex.git] / net / mac80211 / main.c
blob55e76117da9e623ca51a970e7cfe9490ae343fad
1 /*
2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 */
10
11 #include <net/mac80211.h>
12 #include <net/ieee80211_radiotap.h>
13 #include <linux/module.h>
14 #include <linux/init.h>
15 #include <linux/netdevice.h>
16 #include <linux/types.h>
17 #include <linux/slab.h>
18 #include <linux/skbuff.h>
19 #include <linux/etherdevice.h>
20 #include <linux/if_arp.h>
21 #include <linux/wireless.h>
22 #include <linux/rtnetlink.h>
23 #include <linux/bitmap.h>
24 #include <net/net_namespace.h>
25 #include <net/cfg80211.h>
26
27 #include "ieee80211_i.h"
28 #include "rate.h"
29 #include "mesh.h"
30 #include "wep.h"
31 #include "wme.h"
32 #include "aes_ccm.h"
33 #include "led.h"
34 #include "cfg.h"
35 #include "debugfs.h"
36 #include "debugfs_netdev.h"
37
38 #define SUPP_MCS_SET_LEN 16
39
40 /*
41 * For seeing transmitted packets on monitor interfaces
42 * we have a radiotap header too.
43 */
44 struct ieee80211_tx_status_rtap_hdr {
45 struct ieee80211_radiotap_header hdr;
46 __le16 tx_flags;
47 u8 data_retries;
48 } __attribute__ ((packed));
49
50 /* common interface routines */
51
52 static int header_parse_80211(const struct sk_buff *skb, unsigned char *haddr)
53 {
54 memcpy(haddr, skb_mac_header(skb) + 10, ETH_ALEN); /* addr2 */
55 return ETH_ALEN;
56 }
57
58 /* must be called under mdev tx lock */
59 static void ieee80211_configure_filter(struct ieee80211_local *local)
60 {
61 unsigned int changed_flags;
62 unsigned int new_flags = 0;
63
64 if (atomic_read(&local->iff_promiscs))
65 new_flags |= FIF_PROMISC_IN_BSS;
66
67 if (atomic_read(&local->iff_allmultis))
68 new_flags |= FIF_ALLMULTI;
69
70 if (local->monitors)
71 new_flags |= FIF_BCN_PRBRESP_PROMISC;
72
73 if (local->fif_fcsfail)
74 new_flags |= FIF_FCSFAIL;
75
76 if (local->fif_plcpfail)
77 new_flags |= FIF_PLCPFAIL;
78
79 if (local->fif_control)
80 new_flags |= FIF_CONTROL;
81
82 if (local->fif_other_bss)
83 new_flags |= FIF_OTHER_BSS;
84
85 changed_flags = local->filter_flags ^ new_flags;
86
87 /* be a bit nasty */
88 new_flags |= (1<<31);
89
90 local->ops->configure_filter(local_to_hw(local),
91 changed_flags, &new_flags,
92 local->mdev->mc_count,
93 local->mdev->mc_list);
94
95 WARN_ON(new_flags & (1<<31));
96
97 local->filter_flags = new_flags & ~(1<<31);
98 }
99
100 /* master interface */
101
102 static int ieee80211_master_open(struct net_device *dev)
103 {
104 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
105 struct ieee80211_sub_if_data *sdata;
106 int res = -EOPNOTSUPP;
107
108 /* we hold the RTNL here so can safely walk the list */
109 list_for_each_entry(sdata, &local->interfaces, list) {
110 if (sdata->dev != dev && netif_running(sdata->dev)) {
111 res = 0;
112 break;
113 }
114 }
115 return res;
116 }
117
118 static int ieee80211_master_stop(struct net_device *dev)
119 {
120 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
121 struct ieee80211_sub_if_data *sdata;
122
123 /* we hold the RTNL here so can safely walk the list */
124 list_for_each_entry(sdata, &local->interfaces, list)
125 if (sdata->dev != dev && netif_running(sdata->dev))
126 dev_close(sdata->dev);
127
128 return 0;
129 }
130
131 static void ieee80211_master_set_multicast_list(struct net_device *dev)
132 {
133 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
134
135 ieee80211_configure_filter(local);
136 }
137
138 /* regular interfaces */
139
140 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
141 {
142 int meshhdrlen;
143 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
144
145 meshhdrlen = (sdata->vif.type == IEEE80211_IF_TYPE_MESH_POINT) ? 5 : 0;
146
147 /* FIX: what would be proper limits for MTU?
148 * This interface uses 802.3 frames. */
149 if (new_mtu < 256 ||
150 new_mtu > IEEE80211_MAX_DATA_LEN - 24 - 6 - meshhdrlen) {
151 printk(KERN_WARNING "%s: invalid MTU %d\n",
152 dev->name, new_mtu);
153 return -EINVAL;
154 }
155
156 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
157 printk(KERN_DEBUG "%s: setting MTU %d\n", dev->name, new_mtu);
158 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
159 dev->mtu = new_mtu;
160 return 0;
161 }
162
163 static inline int identical_mac_addr_allowed(int type1, int type2)
164 {
165 return (type1 == IEEE80211_IF_TYPE_MNTR ||
166 type2 == IEEE80211_IF_TYPE_MNTR ||
167 (type1 == IEEE80211_IF_TYPE_AP &&
168 type2 == IEEE80211_IF_TYPE_WDS) ||
169 (type1 == IEEE80211_IF_TYPE_WDS &&
170 (type2 == IEEE80211_IF_TYPE_WDS ||
171 type2 == IEEE80211_IF_TYPE_AP)) ||
172 (type1 == IEEE80211_IF_TYPE_AP &&
173 type2 == IEEE80211_IF_TYPE_VLAN) ||
174 (type1 == IEEE80211_IF_TYPE_VLAN &&
175 (type2 == IEEE80211_IF_TYPE_AP ||
176 type2 == IEEE80211_IF_TYPE_VLAN)));
177 }
178
179 static int ieee80211_open(struct net_device *dev)
180 {
181 struct ieee80211_sub_if_data *sdata, *nsdata;
182 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
183 struct ieee80211_if_init_conf conf;
184 int res;
185 bool need_hw_reconfig = 0;
186 struct sta_info *sta;
187
188 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
189
190 /* we hold the RTNL here so can safely walk the list */
191 list_for_each_entry(nsdata, &local->interfaces, list) {
192 struct net_device *ndev = nsdata->dev;
193
194 if (ndev != dev && ndev != local->mdev && netif_running(ndev)) {
195 /*
196 * Allow only a single IBSS interface to be up at any
197 * time. This is restricted because beacon distribution
198 * cannot work properly if both are in the same IBSS.
199 *
200 * To remove this restriction we'd have to disallow them
201 * from setting the same SSID on different IBSS interfaces
202 * belonging to the same hardware. Then, however, we're
203 * faced with having to adopt two different TSF timers...
204 */
205 if (sdata->vif.type == IEEE80211_IF_TYPE_IBSS &&
206 nsdata->vif.type == IEEE80211_IF_TYPE_IBSS)
207 return -EBUSY;
208
209 /*
210 * Disallow multiple IBSS/STA mode interfaces.
211 *
212 * This is a technical restriction, it is possible although
213 * most likely not IEEE 802.11 compliant to have multiple
214 * STAs with just a single hardware (the TSF timer will not
215 * be adjusted properly.)
216 *
217 * However, because mac80211 uses the master device's BSS
218 * information for each STA/IBSS interface, doing this will
219 * currently corrupt that BSS information completely, unless,
220 * a not very useful case, both STAs are associated to the
221 * same BSS.
222 *
223 * To remove this restriction, the BSS information needs to
224 * be embedded in the STA/IBSS mode sdata instead of using
225 * the master device's BSS structure.
226 */
227 if ((sdata->vif.type == IEEE80211_IF_TYPE_STA ||
228 sdata->vif.type == IEEE80211_IF_TYPE_IBSS) &&
229 (nsdata->vif.type == IEEE80211_IF_TYPE_STA ||
230 nsdata->vif.type == IEEE80211_IF_TYPE_IBSS))
231 return -EBUSY;
232
233 /*
234 * The remaining checks are only performed for interfaces
235 * with the same MAC address.
236 */
237 if (compare_ether_addr(dev->dev_addr, ndev->dev_addr))
238 continue;
239
240 /*
241 * check whether it may have the same address
242 */
243 if (!identical_mac_addr_allowed(sdata->vif.type,
244 nsdata->vif.type))
245 return -ENOTUNIQ;
246
247 /*
248 * can only add VLANs to enabled APs
249 */
250 if (sdata->vif.type == IEEE80211_IF_TYPE_VLAN &&
251 nsdata->vif.type == IEEE80211_IF_TYPE_AP)
252 sdata->u.vlan.ap = nsdata;
253 }
254 }
255
256 switch (sdata->vif.type) {
257 case IEEE80211_IF_TYPE_WDS:
258 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
259 return -ENOLINK;
260 break;
261 case IEEE80211_IF_TYPE_VLAN:
262 if (!sdata->u.vlan.ap)
263 return -ENOLINK;
264 break;
265 case IEEE80211_IF_TYPE_AP:
266 case IEEE80211_IF_TYPE_STA:
267 case IEEE80211_IF_TYPE_MNTR:
268 case IEEE80211_IF_TYPE_IBSS:
269 case IEEE80211_IF_TYPE_MESH_POINT:
270 /* no special treatment */
271 break;
272 case IEEE80211_IF_TYPE_INVALID:
273 /* cannot happen */
274 WARN_ON(1);
275 break;
276 }
277
278 if (local->open_count == 0) {
279 res = 0;
280 if (local->ops->start)
281 res = local->ops->start(local_to_hw(local));
282 if (res)
283 return res;
284 need_hw_reconfig = 1;
285 ieee80211_led_radio(local, local->hw.conf.radio_enabled);
286 }
287
288 switch (sdata->vif.type) {
289 case IEEE80211_IF_TYPE_VLAN:
290 list_add(&sdata->u.vlan.list, &sdata->u.vlan.ap->u.ap.vlans);
291 /* no need to tell driver */
292 break;
293 case IEEE80211_IF_TYPE_MNTR:
294 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
295 local->cooked_mntrs++;
296 break;
297 }
298
299 /* must be before the call to ieee80211_configure_filter */
300 local->monitors++;
301 if (local->monitors == 1)
302 local->hw.conf.flags |= IEEE80211_CONF_RADIOTAP;
303
304 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
305 local->fif_fcsfail++;
306 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
307 local->fif_plcpfail++;
308 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL)
309 local->fif_control++;
310 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
311 local->fif_other_bss++;
312
313 netif_tx_lock_bh(local->mdev);
314 ieee80211_configure_filter(local);
315 netif_tx_unlock_bh(local->mdev);
316 break;
317 case IEEE80211_IF_TYPE_STA:
318 case IEEE80211_IF_TYPE_IBSS:
319 sdata->u.sta.flags &= ~IEEE80211_STA_PREV_BSSID_SET;
320 /* fall through */
321 default:
322 conf.vif = &sdata->vif;
323 conf.type = sdata->vif.type;
324 conf.mac_addr = dev->dev_addr;
325 res = local->ops->add_interface(local_to_hw(local), &conf);
326 if (res)
327 goto err_stop;
328
329 ieee80211_if_config(dev);
330 ieee80211_reset_erp_info(dev);
331 ieee80211_enable_keys(sdata);
332
333 if (sdata->vif.type == IEEE80211_IF_TYPE_STA &&
334 !(sdata->flags & IEEE80211_SDATA_USERSPACE_MLME))
335 netif_carrier_off(dev);
336 else
337 netif_carrier_on(dev);
338 }
339
340 if (sdata->vif.type == IEEE80211_IF_TYPE_WDS) {
341 /* Create STA entry for the WDS peer */
342 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
343 GFP_KERNEL);
344 if (!sta) {
345 res = -ENOMEM;
346 goto err_del_interface;
347 }
348
349 sta->flags |= WLAN_STA_AUTHORIZED;
350
351 res = sta_info_insert(sta);
352 if (res) {
353 /* STA has been freed */
354 goto err_del_interface;
355 }
356 }
357
358 if (local->open_count == 0) {
359 res = dev_open(local->mdev);
360 WARN_ON(res);
361 if (res)
362 goto err_del_interface;
363 tasklet_enable(&local->tx_pending_tasklet);
364 tasklet_enable(&local->tasklet);
365 }
366
367 /*
368 * set_multicast_list will be invoked by the networking core
369 * which will check whether any increments here were done in
370 * error and sync them down to the hardware as filter flags.
371 */
372 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
373 atomic_inc(&local->iff_allmultis);
374
375 if (sdata->flags & IEEE80211_SDATA_PROMISC)
376 atomic_inc(&local->iff_promiscs);
377
378 local->open_count++;
379 if (need_hw_reconfig)
380 ieee80211_hw_config(local);
381
382 /*
383 * ieee80211_sta_work is disabled while network interface
384 * is down. Therefore, some configuration changes may not
385 * yet be effective. Trigger execution of ieee80211_sta_work
386 * to fix this.
387 */
388 if (sdata->vif.type == IEEE80211_IF_TYPE_STA ||
389 sdata->vif.type == IEEE80211_IF_TYPE_IBSS) {
390 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
391 queue_work(local->hw.workqueue, &ifsta->work);
392 }
393
394 netif_start_queue(dev);
395
396 return 0;
397 err_del_interface:
398 local->ops->remove_interface(local_to_hw(local), &conf);
399 err_stop:
400 if (!local->open_count && local->ops->stop)
401 local->ops->stop(local_to_hw(local));
402 return res;
403 }
404
405 static int ieee80211_stop(struct net_device *dev)
406 {
407 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
408 struct ieee80211_local *local = sdata->local;
409 struct ieee80211_if_init_conf conf;
410 struct sta_info *sta;
411
412 /*
413 * Stop TX on this interface first.
414 */
415 netif_stop_queue(dev);
416
417 /*
418 * Now delete all active aggregation sessions.
419 */
420 rcu_read_lock();
421
422 list_for_each_entry_rcu(sta, &local->sta_list, list) {
423 if (sta->sdata == sdata)
424 ieee80211_sta_tear_down_BA_sessions(dev, sta->addr);
425 }
426
427 rcu_read_unlock();
428
429 /*
430 * Remove all stations associated with this interface.
431 *
432 * This must be done before calling ops->remove_interface()
433 * because otherwise we can later invoke ops->sta_notify()
434 * whenever the STAs are removed, and that invalidates driver
435 * assumptions about always getting a vif pointer that is valid
436 * (because if we remove a STA after ops->remove_interface()
437 * the driver will have removed the vif info already!)
438 *
439 * We could relax this and only unlink the stations from the
440 * hash table and list but keep them on a per-sdata list that
441 * will be inserted back again when the interface is brought
442 * up again, but I don't currently see a use case for that,
443 * except with WDS which gets a STA entry created when it is
444 * brought up.
445 */
446 sta_info_flush(local, sdata);
447
448 /*
449 * Don't count this interface for promisc/allmulti while it
450 * is down. dev_mc_unsync() will invoke set_multicast_list
451 * on the master interface which will sync these down to the
452 * hardware as filter flags.
453 */
454 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
455 atomic_dec(&local->iff_allmultis);
456
457 if (sdata->flags & IEEE80211_SDATA_PROMISC)
458 atomic_dec(&local->iff_promiscs);
459
460 dev_mc_unsync(local->mdev, dev);
461
462 /* APs need special treatment */
463 if (sdata->vif.type == IEEE80211_IF_TYPE_AP) {
464 struct ieee80211_sub_if_data *vlan, *tmp;
465 struct beacon_data *old_beacon = sdata->u.ap.beacon;
466
467 /* remove beacon */
468 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
469 synchronize_rcu();
470 kfree(old_beacon);
471
472 /* down all dependent devices, that is VLANs */
473 list_for_each_entry_safe(vlan, tmp, &sdata->u.ap.vlans,
474 u.vlan.list)
475 dev_close(vlan->dev);
476 WARN_ON(!list_empty(&sdata->u.ap.vlans));
477 }
478
479 local->open_count--;
480
481 switch (sdata->vif.type) {
482 case IEEE80211_IF_TYPE_VLAN:
483 list_del(&sdata->u.vlan.list);
484 sdata->u.vlan.ap = NULL;
485 /* no need to tell driver */
486 break;
487 case IEEE80211_IF_TYPE_MNTR:
488 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
489 local->cooked_mntrs--;
490 break;
491 }
492
493 local->monitors--;
494 if (local->monitors == 0)
495 local->hw.conf.flags &= ~IEEE80211_CONF_RADIOTAP;
496
497 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
498 local->fif_fcsfail--;
499 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
500 local->fif_plcpfail--;
501 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL)
502 local->fif_control--;
503 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
504 local->fif_other_bss--;
505
506 netif_tx_lock_bh(local->mdev);
507 ieee80211_configure_filter(local);
508 netif_tx_unlock_bh(local->mdev);
509 break;
510 case IEEE80211_IF_TYPE_MESH_POINT:
511 case IEEE80211_IF_TYPE_STA:
512 case IEEE80211_IF_TYPE_IBSS:
513 sdata->u.sta.state = IEEE80211_DISABLED;
514 del_timer_sync(&sdata->u.sta.timer);
515 /*
516 * When we get here, the interface is marked down.
517 * Call synchronize_rcu() to wait for the RX path
518 * should it be using the interface and enqueuing
519 * frames at this very time on another CPU.
520 */
521 synchronize_rcu();
522 skb_queue_purge(&sdata->u.sta.skb_queue);
523
524 if (local->scan_dev == sdata->dev) {
525 if (!local->ops->hw_scan) {
526 local->sta_sw_scanning = 0;
527 cancel_delayed_work(&local->scan_work);
528 } else
529 local->sta_hw_scanning = 0;
530 }
531
532 flush_workqueue(local->hw.workqueue);
533
534 sdata->u.sta.flags &= ~IEEE80211_STA_PRIVACY_INVOKED;
535 kfree(sdata->u.sta.extra_ie);
536 sdata->u.sta.extra_ie = NULL;
537 sdata->u.sta.extra_ie_len = 0;
538 /* fall through */
539 default:
540 conf.vif = &sdata->vif;
541 conf.type = sdata->vif.type;
542 conf.mac_addr = dev->dev_addr;
543 /* disable all keys for as long as this netdev is down */
544 ieee80211_disable_keys(sdata);
545 local->ops->remove_interface(local_to_hw(local), &conf);
546 }
547
548 if (local->open_count == 0) {
549 if (netif_running(local->mdev))
550 dev_close(local->mdev);
551
552 if (local->ops->stop)
553 local->ops->stop(local_to_hw(local));
554
555 ieee80211_led_radio(local, 0);
556
557 tasklet_disable(&local->tx_pending_tasklet);
558 tasklet_disable(&local->tasklet);
559 }
560
561 return 0;
562 }
563
564 int ieee80211_start_tx_ba_session(struct ieee80211_hw *hw, u8 *ra, u16 tid)
565 {
566 struct ieee80211_local *local = hw_to_local(hw);
567 struct sta_info *sta;
568 struct ieee80211_sub_if_data *sdata;
569 u16 start_seq_num = 0;
570 u8 *state;
571 int ret;
572 DECLARE_MAC_BUF(mac);
573
574 if (tid >= STA_TID_NUM)
575 return -EINVAL;
576
577 #ifdef CONFIG_MAC80211_HT_DEBUG
578 printk(KERN_DEBUG "Open BA session requested for %s tid %u\n",
579 print_mac(mac, ra), tid);
580 #endif /* CONFIG_MAC80211_HT_DEBUG */
581
582 rcu_read_lock();
583
584 sta = sta_info_get(local, ra);
585 if (!sta) {
586 printk(KERN_DEBUG "Could not find the station\n");
587 rcu_read_unlock();
588 return -ENOENT;
589 }
590
591 spin_lock_bh(&sta->ampdu_mlme.ampdu_tx);
592
593 /* we have tried too many times, receiver does not want A-MPDU */
594 if (sta->ampdu_mlme.addba_req_num[tid] > HT_AGG_MAX_RETRIES) {
595 ret = -EBUSY;
596 goto start_ba_exit;
597 }
598
599 state = &sta->ampdu_mlme.tid_state_tx[tid];
600 /* check if the TID is not in aggregation flow already */
601 if (*state != HT_AGG_STATE_IDLE) {
602 #ifdef CONFIG_MAC80211_HT_DEBUG
603 printk(KERN_DEBUG "BA request denied - session is not "
604 "idle on tid %u\n", tid);
605 #endif /* CONFIG_MAC80211_HT_DEBUG */
606 ret = -EAGAIN;
607 goto start_ba_exit;
608 }
609
610 /* prepare A-MPDU MLME for Tx aggregation */
611 sta->ampdu_mlme.tid_tx[tid] =
612 kmalloc(sizeof(struct tid_ampdu_tx), GFP_ATOMIC);
613 if (!sta->ampdu_mlme.tid_tx[tid]) {
614 if (net_ratelimit())
615 printk(KERN_ERR "allocate tx mlme to tid %d failed\n",
616 tid);
617 ret = -ENOMEM;
618 goto start_ba_exit;
619 }
620 /* Tx timer */
621 sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.function =
622 sta_addba_resp_timer_expired;
623 sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.data =
624 (unsigned long)&sta->timer_to_tid[tid];
625 init_timer(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer);
626
627 /* ensure that TX flow won't interrupt us
628 * until the end of the call to requeue function */
629 spin_lock_bh(&local->mdev->queue_lock);
630
631 /* create a new queue for this aggregation */
632 ret = ieee80211_ht_agg_queue_add(local, sta, tid);
633
634 /* case no queue is available to aggregation
635 * don't switch to aggregation */
636 if (ret) {
637 #ifdef CONFIG_MAC80211_HT_DEBUG
638 printk(KERN_DEBUG "BA request denied - queue unavailable for"
639 " tid %d\n", tid);
640 #endif /* CONFIG_MAC80211_HT_DEBUG */
641 goto start_ba_err;
642 }
643 sdata = sta->sdata;
644
645 /* Ok, the Addba frame hasn't been sent yet, but if the driver calls the
646 * call back right away, it must see that the flow has begun */
647 *state |= HT_ADDBA_REQUESTED_MSK;
648
649 if (local->ops->ampdu_action)
650 ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_TX_START,
651 ra, tid, &start_seq_num);
652
653 if (ret) {
654 /* No need to requeue the packets in the agg queue, since we
655 * held the tx lock: no packet could be enqueued to the newly
656 * allocated queue */
657 ieee80211_ht_agg_queue_remove(local, sta, tid, 0);
658 #ifdef CONFIG_MAC80211_HT_DEBUG
659 printk(KERN_DEBUG "BA request denied - HW unavailable for"
660 " tid %d\n", tid);
661 #endif /* CONFIG_MAC80211_HT_DEBUG */
662 *state = HT_AGG_STATE_IDLE;
663 goto start_ba_err;
664 }
665
666 /* Will put all the packets in the new SW queue */
667 ieee80211_requeue(local, ieee802_1d_to_ac[tid]);
668 spin_unlock_bh(&local->mdev->queue_lock);
669
670 /* send an addBA request */
671 sta->ampdu_mlme.dialog_token_allocator++;
672 sta->ampdu_mlme.tid_tx[tid]->dialog_token =
673 sta->ampdu_mlme.dialog_token_allocator;
674 sta->ampdu_mlme.tid_tx[tid]->ssn = start_seq_num;
675
676 ieee80211_send_addba_request(sta->sdata->dev, ra, tid,
677 sta->ampdu_mlme.tid_tx[tid]->dialog_token,
678 sta->ampdu_mlme.tid_tx[tid]->ssn,
679 0x40, 5000);
680
681 /* activate the timer for the recipient's addBA response */
682 sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.expires =
683 jiffies + ADDBA_RESP_INTERVAL;
684 add_timer(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer);
685 printk(KERN_DEBUG "activated addBA response timer on tid %d\n", tid);
686 goto start_ba_exit;
687
688 start_ba_err:
689 kfree(sta->ampdu_mlme.tid_tx[tid]);
690 sta->ampdu_mlme.tid_tx[tid] = NULL;
691 spin_unlock_bh(&local->mdev->queue_lock);
692 ret = -EBUSY;
693 start_ba_exit:
694 spin_unlock_bh(&sta->ampdu_mlme.ampdu_tx);
695 rcu_read_unlock();
696 return ret;
697 }
698 EXPORT_SYMBOL(ieee80211_start_tx_ba_session);
699
700 int ieee80211_stop_tx_ba_session(struct ieee80211_hw *hw,
701 u8 *ra, u16 tid,
702 enum ieee80211_back_parties initiator)
703 {
704 struct ieee80211_local *local = hw_to_local(hw);
705 struct sta_info *sta;
706 u8 *state;
707 int ret = 0;
708 DECLARE_MAC_BUF(mac);
709
710 if (tid >= STA_TID_NUM)
711 return -EINVAL;
712
713 rcu_read_lock();
714 sta = sta_info_get(local, ra);
715 if (!sta) {
716 rcu_read_unlock();
717 return -ENOENT;
718 }
719
720 /* check if the TID is in aggregation */
721 state = &sta->ampdu_mlme.tid_state_tx[tid];
722 spin_lock_bh(&sta->ampdu_mlme.ampdu_tx);
723
724 if (*state != HT_AGG_STATE_OPERATIONAL) {
725 ret = -ENOENT;
726 goto stop_BA_exit;
727 }
728
729 #ifdef CONFIG_MAC80211_HT_DEBUG
730 printk(KERN_DEBUG "Tx BA session stop requested for %s tid %u\n",
731 print_mac(mac, ra), tid);
732 #endif /* CONFIG_MAC80211_HT_DEBUG */
733
734 ieee80211_stop_queue(hw, sta->tid_to_tx_q[tid]);
735
736 *state = HT_AGG_STATE_REQ_STOP_BA_MSK |
737 (initiator << HT_AGG_STATE_INITIATOR_SHIFT);
738
739 if (local->ops->ampdu_action)
740 ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_TX_STOP,
741 ra, tid, NULL);
742
743 /* case HW denied going back to legacy */
744 if (ret) {
745 WARN_ON(ret != -EBUSY);
746 *state = HT_AGG_STATE_OPERATIONAL;
747 ieee80211_wake_queue(hw, sta->tid_to_tx_q[tid]);
748 goto stop_BA_exit;
749 }
750
751 stop_BA_exit:
752 spin_unlock_bh(&sta->ampdu_mlme.ampdu_tx);
753 rcu_read_unlock();
754 return ret;
755 }
756 EXPORT_SYMBOL(ieee80211_stop_tx_ba_session);
757
758 void ieee80211_start_tx_ba_cb(struct ieee80211_hw *hw, u8 *ra, u16 tid)
759 {
760 struct ieee80211_local *local = hw_to_local(hw);
761 struct sta_info *sta;
762 u8 *state;
763 DECLARE_MAC_BUF(mac);
764
765 if (tid >= STA_TID_NUM) {
766 printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n",
767 tid, STA_TID_NUM);
768 return;
769 }
770
771 rcu_read_lock();
772 sta = sta_info_get(local, ra);
773 if (!sta) {
774 rcu_read_unlock();
775 printk(KERN_DEBUG "Could not find station: %s\n",
776 print_mac(mac, ra));
777 return;
778 }
779
780 state = &sta->ampdu_mlme.tid_state_tx[tid];
781 spin_lock_bh(&sta->ampdu_mlme.ampdu_tx);
782
783 if (!(*state & HT_ADDBA_REQUESTED_MSK)) {
784 printk(KERN_DEBUG "addBA was not requested yet, state is %d\n",
785 *state);
786 spin_unlock_bh(&sta->ampdu_mlme.ampdu_tx);
787 rcu_read_unlock();
788 return;
789 }
790
791 WARN_ON_ONCE(*state & HT_ADDBA_DRV_READY_MSK);
792
793 *state |= HT_ADDBA_DRV_READY_MSK;
794
795 if (*state == HT_AGG_STATE_OPERATIONAL) {
796 printk(KERN_DEBUG "Aggregation is on for tid %d \n", tid);
797 ieee80211_wake_queue(hw, sta->tid_to_tx_q[tid]);
798 }
799 spin_unlock_bh(&sta->ampdu_mlme.ampdu_tx);
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 printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n",
814 tid, STA_TID_NUM);
815 return;
816 }
817
818 #ifdef CONFIG_MAC80211_HT_DEBUG
819 printk(KERN_DEBUG "Stopping Tx BA session for %s tid %d\n",
820 print_mac(mac, ra), tid);
821 #endif /* CONFIG_MAC80211_HT_DEBUG */
822
823 rcu_read_lock();
824 sta = sta_info_get(local, ra);
825 if (!sta) {
826 printk(KERN_DEBUG "Could not find station: %s\n",
827 print_mac(mac, ra));
828 rcu_read_unlock();
829 return;
830 }
831 state = &sta->ampdu_mlme.tid_state_tx[tid];
832
833 spin_lock_bh(&sta->ampdu_mlme.ampdu_tx);
834 if ((*state & HT_AGG_STATE_REQ_STOP_BA_MSK) == 0) {
835 printk(KERN_DEBUG "unexpected callback to A-MPDU stop\n");
836 spin_unlock_bh(&sta->ampdu_mlme.ampdu_tx);
837 rcu_read_unlock();
838 return;
839 }
840
841 if (*state & HT_AGG_STATE_INITIATOR_MSK)
842 ieee80211_send_delba(sta->sdata->dev, ra, tid,
843 WLAN_BACK_INITIATOR, WLAN_REASON_QSTA_NOT_USE);
844
845 agg_queue = sta->tid_to_tx_q[tid];
846
847 /* avoid ordering issues: we are the only one that can modify
848 * the content of the qdiscs */
849 spin_lock_bh(&local->mdev->queue_lock);
850 /* remove the queue for this aggregation */
851 ieee80211_ht_agg_queue_remove(local, sta, tid, 1);
852 spin_unlock_bh(&local->mdev->queue_lock);
853
854 /* we just requeued the all the frames that were in the removed
855 * queue, and since we might miss a softirq we do netif_schedule.
856 * ieee80211_wake_queue is not used here as this queue is not
857 * necessarily stopped */
858 netif_schedule(local->mdev);
859 *state = HT_AGG_STATE_IDLE;
860 sta->ampdu_mlme.addba_req_num[tid] = 0;
861 kfree(sta->ampdu_mlme.tid_tx[tid]);
862 sta->ampdu_mlme.tid_tx[tid] = NULL;
863 spin_unlock_bh(&sta->ampdu_mlme.ampdu_tx);
864
865 rcu_read_unlock();
866 }
867 EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb);
868
869 void ieee80211_start_tx_ba_cb_irqsafe(struct ieee80211_hw *hw,
870 const u8 *ra, u16 tid)
871 {
872 struct ieee80211_local *local = hw_to_local(hw);
873 struct ieee80211_ra_tid *ra_tid;
874 struct sk_buff *skb = dev_alloc_skb(0);
875
876 if (unlikely(!skb)) {
877 if (net_ratelimit())
878 printk(KERN_WARNING "%s: Not enough memory, "
879 "dropping start BA session", skb->dev->name);
880 return;
881 }
882 ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
883 memcpy(&ra_tid->ra, ra, ETH_ALEN);
884 ra_tid->tid = tid;
885
886 skb->pkt_type = IEEE80211_ADDBA_MSG;
887 skb_queue_tail(&local->skb_queue, skb);
888 tasklet_schedule(&local->tasklet);
889 }
890 EXPORT_SYMBOL(ieee80211_start_tx_ba_cb_irqsafe);
891
892 void ieee80211_stop_tx_ba_cb_irqsafe(struct ieee80211_hw *hw,
893 const u8 *ra, u16 tid)
894 {
895 struct ieee80211_local *local = hw_to_local(hw);
896 struct ieee80211_ra_tid *ra_tid;
897 struct sk_buff *skb = dev_alloc_skb(0);
898
899 if (unlikely(!skb)) {
900 if (net_ratelimit())
901 printk(KERN_WARNING "%s: Not enough memory, "
902 "dropping stop BA session", skb->dev->name);
903 return;
904 }
905 ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
906 memcpy(&ra_tid->ra, ra, ETH_ALEN);
907 ra_tid->tid = tid;
908
909 skb->pkt_type = IEEE80211_DELBA_MSG;
910 skb_queue_tail(&local->skb_queue, skb);
911 tasklet_schedule(&local->tasklet);
912 }
913 EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb_irqsafe);
914
915 static void ieee80211_set_multicast_list(struct net_device *dev)
916 {
917 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
918 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
919 int allmulti, promisc, sdata_allmulti, sdata_promisc;
920
921 allmulti = !!(dev->flags & IFF_ALLMULTI);
922 promisc = !!(dev->flags & IFF_PROMISC);
923 sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
924 sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
925
926 if (allmulti != sdata_allmulti) {
927 if (dev->flags & IFF_ALLMULTI)
928 atomic_inc(&local->iff_allmultis);
929 else
930 atomic_dec(&local->iff_allmultis);
931 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
932 }
933
934 if (promisc != sdata_promisc) {
935 if (dev->flags & IFF_PROMISC)
936 atomic_inc(&local->iff_promiscs);
937 else
938 atomic_dec(&local->iff_promiscs);
939 sdata->flags ^= IEEE80211_SDATA_PROMISC;
940 }
941
942 dev_mc_sync(local->mdev, dev);
943 }
944
945 static const struct header_ops ieee80211_header_ops = {
946 .create = eth_header,
947 .parse = header_parse_80211,
948 .rebuild = eth_rebuild_header,
949 .cache = eth_header_cache,
950 .cache_update = eth_header_cache_update,
951 };
952
953 /* Must not be called for mdev */
954 void ieee80211_if_setup(struct net_device *dev)
955 {
956 ether_setup(dev);
957 dev->hard_start_xmit = ieee80211_subif_start_xmit;
958 dev->wireless_handlers = &ieee80211_iw_handler_def;
959 dev->set_multicast_list = ieee80211_set_multicast_list;
960 dev->change_mtu = ieee80211_change_mtu;
961 dev->open = ieee80211_open;
962 dev->stop = ieee80211_stop;
963 dev->destructor = ieee80211_if_free;
964 }
965
966 /* everything else */
967
968 static int __ieee80211_if_config(struct net_device *dev,
969 struct sk_buff *beacon,
970 struct ieee80211_tx_control *control)
971 {
972 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
973 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
974 struct ieee80211_if_conf conf;
975
976 if (!local->ops->config_interface || !netif_running(dev))
977 return 0;
978
979 memset(&conf, 0, sizeof(conf));
980 conf.type = sdata->vif.type;
981 if (sdata->vif.type == IEEE80211_IF_TYPE_STA ||
982 sdata->vif.type == IEEE80211_IF_TYPE_IBSS) {
983 conf.bssid = sdata->u.sta.bssid;
984 conf.ssid = sdata->u.sta.ssid;
985 conf.ssid_len = sdata->u.sta.ssid_len;
986 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
987 conf.beacon = beacon;
988 conf.beacon_control = control;
989 ieee80211_start_mesh(dev);
990 } else if (sdata->vif.type == IEEE80211_IF_TYPE_AP) {
991 conf.ssid = sdata->u.ap.ssid;
992 conf.ssid_len = sdata->u.ap.ssid_len;
993 conf.beacon = beacon;
994 conf.beacon_control = control;
995 }
996 return local->ops->config_interface(local_to_hw(local),
997 &sdata->vif, &conf);
998 }
999
1000 int ieee80211_if_config(struct net_device *dev)
1001 {
1002 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1003 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1004 if (sdata->vif.type == IEEE80211_IF_TYPE_MESH_POINT &&
1005 (local->hw.flags & IEEE80211_HW_HOST_GEN_BEACON_TEMPLATE))
1006 return ieee80211_if_config_beacon(dev);
1007 return __ieee80211_if_config(dev, NULL, NULL);
1008 }
1009
1010 int ieee80211_if_config_beacon(struct net_device *dev)
1011 {
1012 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1013 struct ieee80211_tx_control control;
1014 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1015 struct sk_buff *skb;
1016
1017 if (!(local->hw.flags & IEEE80211_HW_HOST_GEN_BEACON_TEMPLATE))
1018 return 0;
1019 skb = ieee80211_beacon_get(local_to_hw(local), &sdata->vif,
1020 &control);
1021 if (!skb)
1022 return -ENOMEM;
1023 return __ieee80211_if_config(dev, skb, &control);
1024 }
1025
1026 int ieee80211_hw_config(struct ieee80211_local *local)
1027 {
1028 struct ieee80211_channel *chan;
1029 int ret = 0;
1030
1031 if (local->sta_sw_scanning)
1032 chan = local->scan_channel;
1033 else
1034 chan = local->oper_channel;
1035
1036 local->hw.conf.channel = chan;
1037
1038 if (!local->hw.conf.power_level)
1039 local->hw.conf.power_level = chan->max_power;
1040 else
1041 local->hw.conf.power_level = min(chan->max_power,
1042 local->hw.conf.power_level);
1043
1044 local->hw.conf.max_antenna_gain = chan->max_antenna_gain;
1045
1046 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1047 printk(KERN_DEBUG "%s: HW CONFIG: freq=%d\n",
1048 wiphy_name(local->hw.wiphy), chan->center_freq);
1049 #endif
1050
1051 if (local->open_count)
1052 ret = local->ops->config(local_to_hw(local), &local->hw.conf);
1053
1054 return ret;
1055 }
1056
1057 /**
1058 * ieee80211_handle_ht should be used only after legacy configuration
1059 * has been determined namely band, as ht configuration depends upon
1060 * the hardware's HT abilities for a _specific_ band.
1061 */
1062 u32 ieee80211_handle_ht(struct ieee80211_local *local, int enable_ht,
1063 struct ieee80211_ht_info *req_ht_cap,
1064 struct ieee80211_ht_bss_info *req_bss_cap)
1065 {
1066 struct ieee80211_conf *conf = &local->hw.conf;
1067 struct ieee80211_supported_band *sband;
1068 struct ieee80211_ht_info ht_conf;
1069 struct ieee80211_ht_bss_info ht_bss_conf;
1070 int i;
1071 u32 changed = 0;
1072
1073 sband = local->hw.wiphy->bands[conf->channel->band];
1074
1075 /* HT is not supported */
1076 if (!sband->ht_info.ht_supported) {
1077 conf->flags &= ~IEEE80211_CONF_SUPPORT_HT_MODE;
1078 return 0;
1079 }
1080
1081 memset(&ht_conf, 0, sizeof(struct ieee80211_ht_info));
1082 memset(&ht_bss_conf, 0, sizeof(struct ieee80211_ht_bss_info));
1083
1084 if (enable_ht) {
1085 if (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE))
1086 changed |= BSS_CHANGED_HT;
1087
1088 conf->flags |= IEEE80211_CONF_SUPPORT_HT_MODE;
1089 ht_conf.ht_supported = 1;
1090
1091 ht_conf.cap = req_ht_cap->cap & sband->ht_info.cap;
1092 ht_conf.cap &= ~(IEEE80211_HT_CAP_MIMO_PS);
1093 ht_conf.cap |= sband->ht_info.cap & IEEE80211_HT_CAP_MIMO_PS;
1094
1095 for (i = 0; i < SUPP_MCS_SET_LEN; i++)
1096 ht_conf.supp_mcs_set[i] =
1097 sband->ht_info.supp_mcs_set[i] &
1098 req_ht_cap->supp_mcs_set[i];
1099
1100 ht_bss_conf.primary_channel = req_bss_cap->primary_channel;
1101 ht_bss_conf.bss_cap = req_bss_cap->bss_cap;
1102 ht_bss_conf.bss_op_mode = req_bss_cap->bss_op_mode;
1103
1104 ht_conf.ampdu_factor = req_ht_cap->ampdu_factor;
1105 ht_conf.ampdu_density = req_ht_cap->ampdu_density;
1106
1107 /* if bss configuration changed store the new one */
1108 if (memcmp(&conf->ht_conf, &ht_conf, sizeof(ht_conf)) ||
1109 memcmp(&conf->ht_bss_conf, &ht_bss_conf, sizeof(ht_bss_conf))) {
1110 changed |= BSS_CHANGED_HT;
1111 memcpy(&conf->ht_conf, &ht_conf, sizeof(ht_conf));
1112 memcpy(&conf->ht_bss_conf, &ht_bss_conf, sizeof(ht_bss_conf));
1113 }
1114 } else {
1115 if (conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE)
1116 changed |= BSS_CHANGED_HT;
1117 conf->flags &= ~IEEE80211_CONF_SUPPORT_HT_MODE;
1118 }
1119
1120 return changed;
1121 }
1122
1123 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
1124 u32 changed)
1125 {
1126 struct ieee80211_local *local = sdata->local;
1127
1128 if (!changed)
1129 return;
1130
1131 if (local->ops->bss_info_changed)
1132 local->ops->bss_info_changed(local_to_hw(local),
1133 &sdata->vif,
1134 &sdata->bss_conf,
1135 changed);
1136 }
1137
1138 void ieee80211_reset_erp_info(struct net_device *dev)
1139 {
1140 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1141
1142 sdata->bss_conf.use_cts_prot = 0;
1143 sdata->bss_conf.use_short_preamble = 0;
1144 ieee80211_bss_info_change_notify(sdata,
1145 BSS_CHANGED_ERP_CTS_PROT |
1146 BSS_CHANGED_ERP_PREAMBLE);
1147 }
1148
1149 void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
1150 struct sk_buff *skb,
1151 struct ieee80211_tx_status *status)
1152 {
1153 struct ieee80211_local *local = hw_to_local(hw);
1154 struct ieee80211_tx_status *saved;
1155 int tmp;
1156
1157 skb->dev = local->mdev;
1158 saved = kmalloc(sizeof(struct ieee80211_tx_status), GFP_ATOMIC);
1159 if (unlikely(!saved)) {
1160 if (net_ratelimit())
1161 printk(KERN_WARNING "%s: Not enough memory, "
1162 "dropping tx status", skb->dev->name);
1163 /* should be dev_kfree_skb_irq, but due to this function being
1164 * named _irqsafe instead of just _irq we can't be sure that
1165 * people won't call it from non-irq contexts */
1166 dev_kfree_skb_any(skb);
1167 return;
1168 }
1169 memcpy(saved, status, sizeof(struct ieee80211_tx_status));
1170 /* copy pointer to saved status into skb->cb for use by tasklet */
1171 memcpy(skb->cb, &saved, sizeof(saved));
1172
1173 skb->pkt_type = IEEE80211_TX_STATUS_MSG;
1174 skb_queue_tail(status->control.flags & IEEE80211_TXCTL_REQ_TX_STATUS ?
1175 &local->skb_queue : &local->skb_queue_unreliable, skb);
1176 tmp = skb_queue_len(&local->skb_queue) +
1177 skb_queue_len(&local->skb_queue_unreliable);
1178 while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
1179 (skb = skb_dequeue(&local->skb_queue_unreliable))) {
1180 memcpy(&saved, skb->cb, sizeof(saved));
1181 kfree(saved);
1182 dev_kfree_skb_irq(skb);
1183 tmp--;
1184 I802_DEBUG_INC(local->tx_status_drop);
1185 }
1186 tasklet_schedule(&local->tasklet);
1187 }
1188 EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
1189
1190 static void ieee80211_tasklet_handler(unsigned long data)
1191 {
1192 struct ieee80211_local *local = (struct ieee80211_local *) data;
1193 struct sk_buff *skb;
1194 struct ieee80211_rx_status rx_status;
1195 struct ieee80211_tx_status *tx_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 /* get pointer to saved status out of skb->cb */
1211 memcpy(&tx_status, skb->cb, sizeof(tx_status));
1212 skb->pkt_type = 0;
1213 ieee80211_tx_status(local_to_hw(local),
1214 skb, tx_status);
1215 kfree(tx_status);
1216 break;
1217 case IEEE80211_DELBA_MSG:
1218 ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
1219 ieee80211_stop_tx_ba_cb(local_to_hw(local),
1220 ra_tid->ra, ra_tid->tid);
1221 dev_kfree_skb(skb);
1222 break;
1223 case IEEE80211_ADDBA_MSG:
1224 ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
1225 ieee80211_start_tx_ba_cb(local_to_hw(local),
1226 ra_tid->ra, ra_tid->tid);
1227 dev_kfree_skb(skb);
1228 break ;
1229 default: /* should never get here! */
1230 printk(KERN_ERR "%s: Unknown message type (%d)\n",
1231 wiphy_name(local->hw.wiphy), skb->pkt_type);
1232 dev_kfree_skb(skb);
1233 break;
1234 }
1235 }
1236 }
1237
1238 /* Remove added headers (e.g., QoS control), encryption header/MIC, etc. to
1239 * make a prepared TX frame (one that has been given to hw) to look like brand
1240 * new IEEE 802.11 frame that is ready to go through TX processing again.
1241 * Also, tx_packet_data in cb is restored from tx_control. */
1242 static void ieee80211_remove_tx_extra(struct ieee80211_local *local,
1243 struct ieee80211_key *key,
1244 struct sk_buff *skb,
1245 struct ieee80211_tx_control *control)
1246 {
1247 int hdrlen, iv_len, mic_len;
1248 struct ieee80211_tx_packet_data *pkt_data;
1249
1250 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1251 pkt_data->ifindex = vif_to_sdata(control->vif)->dev->ifindex;
1252 pkt_data->flags = 0;
1253 if (control->flags & IEEE80211_TXCTL_REQ_TX_STATUS)
1254 pkt_data->flags |= IEEE80211_TXPD_REQ_TX_STATUS;
1255 if (control->flags & IEEE80211_TXCTL_DO_NOT_ENCRYPT)
1256 pkt_data->flags |= IEEE80211_TXPD_DO_NOT_ENCRYPT;
1257 if (control->flags & IEEE80211_TXCTL_REQUEUE)
1258 pkt_data->flags |= IEEE80211_TXPD_REQUEUE;
1259 if (control->flags & IEEE80211_TXCTL_EAPOL_FRAME)
1260 pkt_data->flags |= IEEE80211_TXPD_EAPOL_FRAME;
1261 pkt_data->queue = control->queue;
1262
1263 hdrlen = ieee80211_get_hdrlen_from_skb(skb);
1264
1265 if (!key)
1266 goto no_key;
1267
1268 switch (key->conf.alg) {
1269 case ALG_WEP:
1270 iv_len = WEP_IV_LEN;
1271 mic_len = WEP_ICV_LEN;
1272 break;
1273 case ALG_TKIP:
1274 iv_len = TKIP_IV_LEN;
1275 mic_len = TKIP_ICV_LEN;
1276 break;
1277 case ALG_CCMP:
1278 iv_len = CCMP_HDR_LEN;
1279 mic_len = CCMP_MIC_LEN;
1280 break;
1281 default:
1282 goto no_key;
1283 }
1284
1285 if (skb->len >= mic_len &&
1286 !(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
1287 skb_trim(skb, skb->len - mic_len);
1288 if (skb->len >= iv_len && skb->len > hdrlen) {
1289 memmove(skb->data + iv_len, skb->data, hdrlen);
1290 skb_pull(skb, iv_len);
1291 }
1292
1293 no_key:
1294 {
1295 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1296 u16 fc = le16_to_cpu(hdr->frame_control);
1297 if ((fc & 0x8C) == 0x88) /* QoS Control Field */ {
1298 fc &= ~IEEE80211_STYPE_QOS_DATA;
1299 hdr->frame_control = cpu_to_le16(fc);
1300 memmove(skb->data + 2, skb->data, hdrlen - 2);
1301 skb_pull(skb, 2);
1302 }
1303 }
1304 }
1305
1306 static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
1307 struct sta_info *sta,
1308 struct sk_buff *skb,
1309 struct ieee80211_tx_status *status)
1310 {
1311 sta->tx_filtered_count++;
1312
1313 /*
1314 * Clear the TX filter mask for this STA when sending the next
1315 * packet. If the STA went to power save mode, this will happen
1316 * happen when it wakes up for the next time.
1317 */
1318 sta->flags |= WLAN_STA_CLEAR_PS_FILT;
1319
1320 /*
1321 * This code races in the following way:
1322 *
1323 * (1) STA sends frame indicating it will go to sleep and does so
1324 * (2) hardware/firmware adds STA to filter list, passes frame up
1325 * (3) hardware/firmware processes TX fifo and suppresses a frame
1326 * (4) we get TX status before having processed the frame and
1327 * knowing that the STA has gone to sleep.
1328 *
1329 * This is actually quite unlikely even when both those events are
1330 * processed from interrupts coming in quickly after one another or
1331 * even at the same time because we queue both TX status events and
1332 * RX frames to be processed by a tasklet and process them in the
1333 * same order that they were received or TX status last. Hence, there
1334 * is no race as long as the frame RX is processed before the next TX
1335 * status, which drivers can ensure, see below.
1336 *
1337 * Note that this can only happen if the hardware or firmware can
1338 * actually add STAs to the filter list, if this is done by the
1339 * driver in response to set_tim() (which will only reduce the race
1340 * this whole filtering tries to solve, not completely solve it)
1341 * this situation cannot happen.
1342 *
1343 * To completely solve this race drivers need to make sure that they
1344 * (a) don't mix the irq-safe/not irq-safe TX status/RX processing
1345 * functions and
1346 * (b) always process RX events before TX status events if ordering
1347 * can be unknown, for example with different interrupt status
1348 * bits.
1349 */
1350 if (sta->flags & WLAN_STA_PS &&
1351 skb_queue_len(&sta->tx_filtered) < STA_MAX_TX_BUFFER) {
1352 ieee80211_remove_tx_extra(local, sta->key, skb,
1353 &status->control);
1354 skb_queue_tail(&sta->tx_filtered, skb);
1355 return;
1356 }
1357
1358 if (!(sta->flags & WLAN_STA_PS) &&
1359 !(status->control.flags & IEEE80211_TXCTL_REQUEUE)) {
1360 /* Software retry the packet once */
1361 status->control.flags |= IEEE80211_TXCTL_REQUEUE;
1362 ieee80211_remove_tx_extra(local, sta->key, skb,
1363 &status->control);
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 !!(sta->flags & 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 struct ieee80211_tx_status *status)
1379 {
1380 struct sk_buff *skb2;
1381 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1382 struct ieee80211_local *local = hw_to_local(hw);
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 if (!status) {
1389 printk(KERN_ERR
1390 "%s: ieee80211_tx_status called with NULL status\n",
1391 wiphy_name(local->hw.wiphy));
1392 dev_kfree_skb(skb);
1393 return;
1394 }
1395
1396 rcu_read_lock();
1397
1398 if (status->excessive_retries) {
1399 struct sta_info *sta;
1400 sta = sta_info_get(local, hdr->addr1);
1401 if (sta) {
1402 if (sta->flags & WLAN_STA_PS) {
1403 /*
1404 * The STA is in power save mode, so assume
1405 * that this TX packet failed because of that.
1406 */
1407 status->excessive_retries = 0;
1408 status->flags |= IEEE80211_TX_STATUS_TX_FILTERED;
1409 ieee80211_handle_filtered_frame(local, sta,
1410 skb, status);
1411 rcu_read_unlock();
1412 return;
1413 }
1414 }
1415 }
1416
1417 if (status->flags & IEEE80211_TX_STATUS_TX_FILTERED) {
1418 struct sta_info *sta;
1419 sta = sta_info_get(local, hdr->addr1);
1420 if (sta) {
1421 ieee80211_handle_filtered_frame(local, sta, skb,
1422 status);
1423 rcu_read_unlock();
1424 return;
1425 }
1426 } else
1427 rate_control_tx_status(local->mdev, skb, status);
1428
1429 rcu_read_unlock();
1430
1431 ieee80211_led_tx(local, 0);
1432
1433 /* SNMP counters
1434 * Fragments are passed to low-level drivers as separate skbs, so these
1435 * are actually fragments, not frames. Update frame counters only for
1436 * the first fragment of the frame. */
1437
1438 frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG;
1439 type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE;
1440
1441 if (status->flags & IEEE80211_TX_STATUS_ACK) {
1442 if (frag == 0) {
1443 local->dot11TransmittedFrameCount++;
1444 if (is_multicast_ether_addr(hdr->addr1))
1445 local->dot11MulticastTransmittedFrameCount++;
1446 if (status->retry_count > 0)
1447 local->dot11RetryCount++;
1448 if (status->retry_count > 1)
1449 local->dot11MultipleRetryCount++;
1450 }
1451
1452 /* This counter shall be incremented for an acknowledged MPDU
1453 * with an individual address in the address 1 field or an MPDU
1454 * with a multicast address in the address 1 field of type Data
1455 * or Management. */
1456 if (!is_multicast_ether_addr(hdr->addr1) ||
1457 type == IEEE80211_FTYPE_DATA ||
1458 type == IEEE80211_FTYPE_MGMT)
1459 local->dot11TransmittedFragmentCount++;
1460 } else {
1461 if (frag == 0)
1462 local->dot11FailedCount++;
1463 }
1464
1465 /* this was a transmitted frame, but now we want to reuse it */
1466 skb_orphan(skb);
1467
1468 /*
1469 * This is a bit racy but we can avoid a lot of work
1470 * with this test...
1471 */
1472 if (!local->monitors && !local->cooked_mntrs) {
1473 dev_kfree_skb(skb);
1474 return;
1475 }
1476
1477 /* send frame to monitor interfaces now */
1478
1479 if (skb_headroom(skb) < sizeof(*rthdr)) {
1480 printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
1481 dev_kfree_skb(skb);
1482 return;
1483 }
1484
1485 rthdr = (struct ieee80211_tx_status_rtap_hdr *)
1486 skb_push(skb, sizeof(*rthdr));
1487
1488 memset(rthdr, 0, sizeof(*rthdr));
1489 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
1490 rthdr->hdr.it_present =
1491 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
1492 (1 << IEEE80211_RADIOTAP_DATA_RETRIES));
1493
1494 if (!(status->flags & IEEE80211_TX_STATUS_ACK) &&
1495 !is_multicast_ether_addr(hdr->addr1))
1496 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL);
1497
1498 if ((status->control.flags & IEEE80211_TXCTL_USE_RTS_CTS) &&
1499 (status->control.flags & IEEE80211_TXCTL_USE_CTS_PROTECT))
1500 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS);
1501 else if (status->control.flags & IEEE80211_TXCTL_USE_RTS_CTS)
1502 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS);
1503
1504 rthdr->data_retries = status->retry_count;
1505
1506 /* XXX: is this sufficient for BPF? */
1507 skb_set_mac_header(skb, 0);
1508 skb->ip_summed = CHECKSUM_UNNECESSARY;
1509 skb->pkt_type = PACKET_OTHERHOST;
1510 skb->protocol = htons(ETH_P_802_2);
1511 memset(skb->cb, 0, sizeof(skb->cb));
1512
1513 rcu_read_lock();
1514 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
1515 if (sdata->vif.type == IEEE80211_IF_TYPE_MNTR) {
1516 if (!netif_running(sdata->dev))
1517 continue;
1518
1519 if (prev_dev) {
1520 skb2 = skb_clone(skb, GFP_ATOMIC);
1521 if (skb2) {
1522 skb2->dev = prev_dev;
1523 netif_rx(skb2);
1524 }
1525 }
1526
1527 prev_dev = sdata->dev;
1528 }
1529 }
1530 if (prev_dev) {
1531 skb->dev = prev_dev;
1532 netif_rx(skb);
1533 skb = NULL;
1534 }
1535 rcu_read_unlock();
1536 dev_kfree_skb(skb);
1537 }
1538 EXPORT_SYMBOL(ieee80211_tx_status);
1539
1540 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
1541 const struct ieee80211_ops *ops)
1542 {
1543 struct ieee80211_local *local;
1544 int priv_size;
1545 struct wiphy *wiphy;
1546
1547 /* Ensure 32-byte alignment of our private data and hw private data.
1548 * We use the wiphy priv data for both our ieee80211_local and for
1549 * the driver's private data
1550 *
1551 * In memory it'll be like this:
1552 *
1553 * +-------------------------+
1554 * | struct wiphy |
1555 * +-------------------------+
1556 * | struct ieee80211_local |
1557 * +-------------------------+
1558 * | driver's private data |
1559 * +-------------------------+
1560 *
1561 */
1562 priv_size = ((sizeof(struct ieee80211_local) +
1563 NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST) +
1564 priv_data_len;
1565
1566 wiphy = wiphy_new(&mac80211_config_ops, priv_size);
1567
1568 if (!wiphy)
1569 return NULL;
1570
1571 wiphy->privid = mac80211_wiphy_privid;
1572
1573 local = wiphy_priv(wiphy);
1574 local->hw.wiphy = wiphy;
1575
1576 local->hw.priv = (char *)local +
1577 ((sizeof(struct ieee80211_local) +
1578 NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);
1579
1580 BUG_ON(!ops->tx);
1581 BUG_ON(!ops->start);
1582 BUG_ON(!ops->stop);
1583 BUG_ON(!ops->config);
1584 BUG_ON(!ops->add_interface);
1585 BUG_ON(!ops->remove_interface);
1586 BUG_ON(!ops->configure_filter);
1587 local->ops = ops;
1588
1589 local->hw.queues = 1; /* default */
1590
1591 local->bridge_packets = 1;
1592
1593 local->rts_threshold = IEEE80211_MAX_RTS_THRESHOLD;
1594 local->fragmentation_threshold = IEEE80211_MAX_FRAG_THRESHOLD;
1595 local->short_retry_limit = 7;
1596 local->long_retry_limit = 4;
1597 local->hw.conf.radio_enabled = 1;
1598
1599 INIT_LIST_HEAD(&local->interfaces);
1600
1601 spin_lock_init(&local->key_lock);
1602
1603 INIT_DELAYED_WORK(&local->scan_work, ieee80211_sta_scan_work);
1604
1605 sta_info_init(local);
1606
1607 tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
1608 (unsigned long)local);
1609 tasklet_disable(&local->tx_pending_tasklet);
1610
1611 tasklet_init(&local->tasklet,
1612 ieee80211_tasklet_handler,
1613 (unsigned long) local);
1614 tasklet_disable(&local->tasklet);
1615
1616 skb_queue_head_init(&local->skb_queue);
1617 skb_queue_head_init(&local->skb_queue_unreliable);
1618
1619 return local_to_hw(local);
1620 }
1621 EXPORT_SYMBOL(ieee80211_alloc_hw);
1622
1623 int ieee80211_register_hw(struct ieee80211_hw *hw)
1624 {
1625 struct ieee80211_local *local = hw_to_local(hw);
1626 const char *name;
1627 int result;
1628 enum ieee80211_band band;
1629 struct net_device *mdev;
1630 struct ieee80211_sub_if_data *sdata;
1631
1632 /*
1633 * generic code guarantees at least one band,
1634 * set this very early because much code assumes
1635 * that hw.conf.channel is assigned
1636 */
1637 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1638 struct ieee80211_supported_band *sband;
1639
1640 sband = local->hw.wiphy->bands[band];
1641 if (sband) {
1642 /* init channel we're on */
1643 local->hw.conf.channel =
1644 local->oper_channel =
1645 local->scan_channel = &sband->channels[0];
1646 break;
1647 }
1648 }
1649
1650 result = wiphy_register(local->hw.wiphy);
1651 if (result < 0)
1652 return result;
1653
1654 /* for now, mdev needs sub_if_data :/ */
1655 mdev = alloc_netdev(sizeof(struct ieee80211_sub_if_data),
1656 "wmaster%d", ether_setup);
1657 if (!mdev)
1658 goto fail_mdev_alloc;
1659
1660 sdata = IEEE80211_DEV_TO_SUB_IF(mdev);
1661 mdev->ieee80211_ptr = &sdata->wdev;
1662 sdata->wdev.wiphy = local->hw.wiphy;
1663
1664 local->mdev = mdev;
1665
1666 ieee80211_rx_bss_list_init(mdev);
1667
1668 mdev->hard_start_xmit = ieee80211_master_start_xmit;
1669 mdev->open = ieee80211_master_open;
1670 mdev->stop = ieee80211_master_stop;
1671 mdev->type = ARPHRD_IEEE80211;
1672 mdev->header_ops = &ieee80211_header_ops;
1673 mdev->set_multicast_list = ieee80211_master_set_multicast_list;
1674
1675 sdata->vif.type = IEEE80211_IF_TYPE_AP;
1676 sdata->dev = mdev;
1677 sdata->local = local;
1678 sdata->u.ap.force_unicast_rateidx = -1;
1679 sdata->u.ap.max_ratectrl_rateidx = -1;
1680 ieee80211_if_sdata_init(sdata);
1681
1682 /* no RCU needed since we're still during init phase */
1683 list_add_tail(&sdata->list, &local->interfaces);
1684
1685 name = wiphy_dev(local->hw.wiphy)->driver->name;
1686 local->hw.workqueue = create_singlethread_workqueue(name);
1687 if (!local->hw.workqueue) {
1688 result = -ENOMEM;
1689 goto fail_workqueue;
1690 }
1691
1692 /*
1693 * The hardware needs headroom for sending the frame,
1694 * and we need some headroom for passing the frame to monitor
1695 * interfaces, but never both at the same time.
1696 */
1697 local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
1698 sizeof(struct ieee80211_tx_status_rtap_hdr));
1699
1700 debugfs_hw_add(local);
1701
1702 local->hw.conf.beacon_int = 1000;
1703
1704 local->wstats_flags |= local->hw.max_rssi ?
1705 IW_QUAL_LEVEL_UPDATED : IW_QUAL_LEVEL_INVALID;
1706 local->wstats_flags |= local->hw.max_signal ?
1707 IW_QUAL_QUAL_UPDATED : IW_QUAL_QUAL_INVALID;
1708 local->wstats_flags |= local->hw.max_noise ?
1709 IW_QUAL_NOISE_UPDATED : IW_QUAL_NOISE_INVALID;
1710 if (local->hw.max_rssi < 0 || local->hw.max_noise < 0)
1711 local->wstats_flags |= IW_QUAL_DBM;
1712
1713 result = sta_info_start(local);
1714 if (result < 0)
1715 goto fail_sta_info;
1716
1717 rtnl_lock();
1718 result = dev_alloc_name(local->mdev, local->mdev->name);
1719 if (result < 0)
1720 goto fail_dev;
1721
1722 memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1723 SET_NETDEV_DEV(local->mdev, wiphy_dev(local->hw.wiphy));
1724
1725 result = register_netdevice(local->mdev);
1726 if (result < 0)
1727 goto fail_dev;
1728
1729 ieee80211_debugfs_add_netdev(IEEE80211_DEV_TO_SUB_IF(local->mdev));
1730 ieee80211_if_set_type(local->mdev, IEEE80211_IF_TYPE_AP);
1731
1732 result = ieee80211_init_rate_ctrl_alg(local,
1733 hw->rate_control_algorithm);
1734 if (result < 0) {
1735 printk(KERN_DEBUG "%s: Failed to initialize rate control "
1736 "algorithm\n", wiphy_name(local->hw.wiphy));
1737 goto fail_rate;
1738 }
1739
1740 result = ieee80211_wep_init(local);
1741
1742 if (result < 0) {
1743 printk(KERN_DEBUG "%s: Failed to initialize wep\n",
1744 wiphy_name(local->hw.wiphy));
1745 goto fail_wep;
1746 }
1747
1748 if (hw->queues > IEEE80211_MAX_QUEUES)
1749 hw->queues = IEEE80211_MAX_QUEUES;
1750 if (hw->ampdu_queues > IEEE80211_MAX_AMPDU_QUEUES)
1751 hw->ampdu_queues = IEEE80211_MAX_AMPDU_QUEUES;
1752
1753 ieee80211_install_qdisc(local->mdev);
1754
1755 /* add one default STA interface */
1756 result = ieee80211_if_add(local->mdev, "wlan%d", NULL,
1757 IEEE80211_IF_TYPE_STA, NULL);
1758 if (result)
1759 printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
1760 wiphy_name(local->hw.wiphy));
1761
1762 local->reg_state = IEEE80211_DEV_REGISTERED;
1763 rtnl_unlock();
1764
1765 ieee80211_led_init(local);
1766
1767 return 0;
1768
1769 fail_wep:
1770 rate_control_deinitialize(local);
1771 fail_rate:
1772 ieee80211_debugfs_remove_netdev(IEEE80211_DEV_TO_SUB_IF(local->mdev));
1773 unregister_netdevice(local->mdev);
1774 fail_dev:
1775 rtnl_unlock();
1776 sta_info_stop(local);
1777 fail_sta_info:
1778 debugfs_hw_del(local);
1779 destroy_workqueue(local->hw.workqueue);
1780 fail_workqueue:
1781 ieee80211_if_free(local->mdev);
1782 local->mdev = NULL;
1783 fail_mdev_alloc:
1784 wiphy_unregister(local->hw.wiphy);
1785 return result;
1786 }
1787 EXPORT_SYMBOL(ieee80211_register_hw);
1788
1789 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
1790 {
1791 struct ieee80211_local *local = hw_to_local(hw);
1792 struct ieee80211_sub_if_data *sdata, *tmp;
1793
1794 tasklet_kill(&local->tx_pending_tasklet);
1795 tasklet_kill(&local->tasklet);
1796
1797 rtnl_lock();
1798
1799 BUG_ON(local->reg_state != IEEE80211_DEV_REGISTERED);
1800
1801 local->reg_state = IEEE80211_DEV_UNREGISTERED;
1802
1803 /*
1804 * At this point, interface list manipulations are fine
1805 * because the driver cannot be handing us frames any
1806 * more and the tasklet is killed.
1807 */
1808
1809 /*
1810 * First, we remove all non-master interfaces. Do this because they
1811 * may have bss pointer dependency on the master, and when we free
1812 * the master these would be freed as well, breaking our list
1813 * iteration completely.
1814 */
1815 list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1816 if (sdata->dev == local->mdev)
1817 continue;
1818 list_del(&sdata->list);
1819 __ieee80211_if_del(local, sdata);
1820 }
1821
1822 /* then, finally, remove the master interface */
1823 __ieee80211_if_del(local, IEEE80211_DEV_TO_SUB_IF(local->mdev));
1824
1825 rtnl_unlock();
1826
1827 ieee80211_rx_bss_list_deinit(local->mdev);
1828 ieee80211_clear_tx_pending(local);
1829 sta_info_stop(local);
1830 rate_control_deinitialize(local);
1831 debugfs_hw_del(local);
1832
1833 if (skb_queue_len(&local->skb_queue)
1834 || skb_queue_len(&local->skb_queue_unreliable))
1835 printk(KERN_WARNING "%s: skb_queue not empty\n",
1836 wiphy_name(local->hw.wiphy));
1837 skb_queue_purge(&local->skb_queue);
1838 skb_queue_purge(&local->skb_queue_unreliable);
1839
1840 destroy_workqueue(local->hw.workqueue);
1841 wiphy_unregister(local->hw.wiphy);
1842 ieee80211_wep_free(local);
1843 ieee80211_led_exit(local);
1844 ieee80211_if_free(local->mdev);
1845 local->mdev = NULL;
1846 }
1847 EXPORT_SYMBOL(ieee80211_unregister_hw);
1848
1849 void ieee80211_free_hw(struct ieee80211_hw *hw)
1850 {
1851 struct ieee80211_local *local = hw_to_local(hw);
1852
1853 wiphy_free(local->hw.wiphy);
1854 }
1855 EXPORT_SYMBOL(ieee80211_free_hw);
1856
1857 static int __init ieee80211_init(void)
1858 {
1859 struct sk_buff *skb;
1860 int ret;
1861
1862 BUILD_BUG_ON(sizeof(struct ieee80211_tx_packet_data) > sizeof(skb->cb));
1863
1864 ret = rc80211_pid_init();
1865 if (ret)
1866 goto out;
1867
1868 ret = ieee80211_wme_register();
1869 if (ret) {
1870 printk(KERN_DEBUG "ieee80211_init: failed to "
1871 "initialize WME (err=%d)\n", ret);
1872 goto out_cleanup_pid;
1873 }
1874
1875 ieee80211_debugfs_netdev_init();
1876
1877 return 0;
1878
1879 out_cleanup_pid:
1880 rc80211_pid_exit();
1881 out:
1882 return ret;
1883 }
1884
1885 static void __exit ieee80211_exit(void)
1886 {
1887 rc80211_pid_exit();
1888
1889 /*
1890 * For key todo, it'll be empty by now but the work
1891 * might still be scheduled.
1892 */
1893 flush_scheduled_work();
1894
1895 if (mesh_allocated)
1896 ieee80211s_stop();
1897
1898 ieee80211_wme_unregister();
1899 ieee80211_debugfs_netdev_exit();
1900 }
1901
1902
1903 subsys_initcall(ieee80211_init);
1904 module_exit(ieee80211_exit);
1905
1906 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1907 MODULE_LICENSE("GPL");
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