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mac80211: fix deadlock in sta->lock
[deliverable/linux.git] / net / mac80211 / main.c
1 /*
2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 */
10
11 #include <net/mac80211.h>
12 #include <net/ieee80211_radiotap.h>
13 #include <linux/module.h>
14 #include <linux/init.h>
15 #include <linux/netdevice.h>
16 #include <linux/types.h>
17 #include <linux/slab.h>
18 #include <linux/skbuff.h>
19 #include <linux/etherdevice.h>
20 #include <linux/if_arp.h>
21 #include <linux/wireless.h>
22 #include <linux/rtnetlink.h>
23 #include <linux/bitmap.h>
24 #include <net/net_namespace.h>
25 #include <net/cfg80211.h>
26
27 #include "ieee80211_i.h"
28 #include "rate.h"
29 #include "mesh.h"
30 #include "wep.h"
31 #include "wme.h"
32 #include "aes_ccm.h"
33 #include "led.h"
34 #include "cfg.h"
35 #include "debugfs.h"
36 #include "debugfs_netdev.h"
37
38 /*
39 * For seeing transmitted packets on monitor interfaces
40 * we have a radiotap header too.
41 */
42 struct ieee80211_tx_status_rtap_hdr {
43 struct ieee80211_radiotap_header hdr;
44 __le16 tx_flags;
45 u8 data_retries;
46 } __attribute__ ((packed));
47
48 /* common interface routines */
49
50 static int header_parse_80211(const struct sk_buff *skb, unsigned char *haddr)
51 {
52 memcpy(haddr, skb_mac_header(skb) + 10, ETH_ALEN); /* addr2 */
53 return ETH_ALEN;
54 }
55
56 /* must be called under mdev tx lock */
57 static void ieee80211_configure_filter(struct ieee80211_local *local)
58 {
59 unsigned int changed_flags;
60 unsigned int new_flags = 0;
61
62 if (atomic_read(&local->iff_promiscs))
63 new_flags |= FIF_PROMISC_IN_BSS;
64
65 if (atomic_read(&local->iff_allmultis))
66 new_flags |= FIF_ALLMULTI;
67
68 if (local->monitors)
69 new_flags |= FIF_BCN_PRBRESP_PROMISC;
70
71 if (local->fif_fcsfail)
72 new_flags |= FIF_FCSFAIL;
73
74 if (local->fif_plcpfail)
75 new_flags |= FIF_PLCPFAIL;
76
77 if (local->fif_control)
78 new_flags |= FIF_CONTROL;
79
80 if (local->fif_other_bss)
81 new_flags |= FIF_OTHER_BSS;
82
83 changed_flags = local->filter_flags ^ new_flags;
84
85 /* be a bit nasty */
86 new_flags |= (1<<31);
87
88 local->ops->configure_filter(local_to_hw(local),
89 changed_flags, &new_flags,
90 local->mdev->mc_count,
91 local->mdev->mc_list);
92
93 WARN_ON(new_flags & (1<<31));
94
95 local->filter_flags = new_flags & ~(1<<31);
96 }
97
98 /* master interface */
99
100 static int ieee80211_master_open(struct net_device *dev)
101 {
102 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
103 struct ieee80211_sub_if_data *sdata;
104 int res = -EOPNOTSUPP;
105
106 /* we hold the RTNL here so can safely walk the list */
107 list_for_each_entry(sdata, &local->interfaces, list) {
108 if (sdata->dev != dev && netif_running(sdata->dev)) {
109 res = 0;
110 break;
111 }
112 }
113
114 if (res)
115 return res;
116
117 netif_start_queue(local->mdev);
118
119 return 0;
120 }
121
122 static int ieee80211_master_stop(struct net_device *dev)
123 {
124 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
125 struct ieee80211_sub_if_data *sdata;
126
127 /* we hold the RTNL here so can safely walk the list */
128 list_for_each_entry(sdata, &local->interfaces, list)
129 if (sdata->dev != dev && netif_running(sdata->dev))
130 dev_close(sdata->dev);
131
132 return 0;
133 }
134
135 static void ieee80211_master_set_multicast_list(struct net_device *dev)
136 {
137 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
138
139 ieee80211_configure_filter(local);
140 }
141
142 /* regular interfaces */
143
144 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
145 {
146 int meshhdrlen;
147 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
148
149 meshhdrlen = (sdata->vif.type == IEEE80211_IF_TYPE_MESH_POINT) ? 5 : 0;
150
151 /* FIX: what would be proper limits for MTU?
152 * This interface uses 802.3 frames. */
153 if (new_mtu < 256 ||
154 new_mtu > IEEE80211_MAX_DATA_LEN - 24 - 6 - meshhdrlen) {
155 printk(KERN_WARNING "%s: invalid MTU %d\n",
156 dev->name, new_mtu);
157 return -EINVAL;
158 }
159
160 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
161 printk(KERN_DEBUG "%s: setting MTU %d\n", dev->name, new_mtu);
162 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
163 dev->mtu = new_mtu;
164 return 0;
165 }
166
167 static inline int identical_mac_addr_allowed(int type1, int type2)
168 {
169 return (type1 == IEEE80211_IF_TYPE_MNTR ||
170 type2 == IEEE80211_IF_TYPE_MNTR ||
171 (type1 == IEEE80211_IF_TYPE_AP &&
172 type2 == IEEE80211_IF_TYPE_WDS) ||
173 (type1 == IEEE80211_IF_TYPE_WDS &&
174 (type2 == IEEE80211_IF_TYPE_WDS ||
175 type2 == IEEE80211_IF_TYPE_AP)) ||
176 (type1 == IEEE80211_IF_TYPE_AP &&
177 type2 == IEEE80211_IF_TYPE_VLAN) ||
178 (type1 == IEEE80211_IF_TYPE_VLAN &&
179 (type2 == IEEE80211_IF_TYPE_AP ||
180 type2 == IEEE80211_IF_TYPE_VLAN)));
181 }
182
183 static int ieee80211_open(struct net_device *dev)
184 {
185 struct ieee80211_sub_if_data *sdata, *nsdata;
186 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
187 struct ieee80211_if_init_conf conf;
188 int res;
189 bool need_hw_reconfig = 0;
190 struct sta_info *sta;
191
192 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
193
194 /* we hold the RTNL here so can safely walk the list */
195 list_for_each_entry(nsdata, &local->interfaces, list) {
196 struct net_device *ndev = nsdata->dev;
197
198 if (ndev != dev && ndev != local->mdev && netif_running(ndev)) {
199 /*
200 * Allow only a single IBSS interface to be up at any
201 * time. This is restricted because beacon distribution
202 * cannot work properly if both are in the same IBSS.
203 *
204 * To remove this restriction we'd have to disallow them
205 * from setting the same SSID on different IBSS interfaces
206 * belonging to the same hardware. Then, however, we're
207 * faced with having to adopt two different TSF timers...
208 */
209 if (sdata->vif.type == IEEE80211_IF_TYPE_IBSS &&
210 nsdata->vif.type == IEEE80211_IF_TYPE_IBSS)
211 return -EBUSY;
212
213 /*
214 * Disallow multiple IBSS/STA mode interfaces.
215 *
216 * This is a technical restriction, it is possible although
217 * most likely not IEEE 802.11 compliant to have multiple
218 * STAs with just a single hardware (the TSF timer will not
219 * be adjusted properly.)
220 *
221 * However, because mac80211 uses the master device's BSS
222 * information for each STA/IBSS interface, doing this will
223 * currently corrupt that BSS information completely, unless,
224 * a not very useful case, both STAs are associated to the
225 * same BSS.
226 *
227 * To remove this restriction, the BSS information needs to
228 * be embedded in the STA/IBSS mode sdata instead of using
229 * the master device's BSS structure.
230 */
231 if ((sdata->vif.type == IEEE80211_IF_TYPE_STA ||
232 sdata->vif.type == IEEE80211_IF_TYPE_IBSS) &&
233 (nsdata->vif.type == IEEE80211_IF_TYPE_STA ||
234 nsdata->vif.type == IEEE80211_IF_TYPE_IBSS))
235 return -EBUSY;
236
237 /*
238 * The remaining checks are only performed for interfaces
239 * with the same MAC address.
240 */
241 if (compare_ether_addr(dev->dev_addr, ndev->dev_addr))
242 continue;
243
244 /*
245 * check whether it may have the same address
246 */
247 if (!identical_mac_addr_allowed(sdata->vif.type,
248 nsdata->vif.type))
249 return -ENOTUNIQ;
250
251 /*
252 * can only add VLANs to enabled APs
253 */
254 if (sdata->vif.type == IEEE80211_IF_TYPE_VLAN &&
255 nsdata->vif.type == IEEE80211_IF_TYPE_AP)
256 sdata->u.vlan.ap = nsdata;
257 }
258 }
259
260 switch (sdata->vif.type) {
261 case IEEE80211_IF_TYPE_WDS:
262 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
263 return -ENOLINK;
264 break;
265 case IEEE80211_IF_TYPE_VLAN:
266 if (!sdata->u.vlan.ap)
267 return -ENOLINK;
268 break;
269 case IEEE80211_IF_TYPE_AP:
270 case IEEE80211_IF_TYPE_STA:
271 case IEEE80211_IF_TYPE_MNTR:
272 case IEEE80211_IF_TYPE_IBSS:
273 case IEEE80211_IF_TYPE_MESH_POINT:
274 /* no special treatment */
275 break;
276 case IEEE80211_IF_TYPE_INVALID:
277 /* cannot happen */
278 WARN_ON(1);
279 break;
280 }
281
282 if (local->open_count == 0) {
283 res = 0;
284 if (local->ops->start)
285 res = local->ops->start(local_to_hw(local));
286 if (res)
287 return res;
288 need_hw_reconfig = 1;
289 ieee80211_led_radio(local, local->hw.conf.radio_enabled);
290 }
291
292 switch (sdata->vif.type) {
293 case IEEE80211_IF_TYPE_VLAN:
294 list_add(&sdata->u.vlan.list, &sdata->u.vlan.ap->u.ap.vlans);
295 /* no need to tell driver */
296 break;
297 case IEEE80211_IF_TYPE_MNTR:
298 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
299 local->cooked_mntrs++;
300 break;
301 }
302
303 /* must be before the call to ieee80211_configure_filter */
304 local->monitors++;
305 if (local->monitors == 1)
306 local->hw.conf.flags |= IEEE80211_CONF_RADIOTAP;
307
308 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
309 local->fif_fcsfail++;
310 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
311 local->fif_plcpfail++;
312 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL)
313 local->fif_control++;
314 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
315 local->fif_other_bss++;
316
317 netif_tx_lock_bh(local->mdev);
318 ieee80211_configure_filter(local);
319 netif_tx_unlock_bh(local->mdev);
320 break;
321 case IEEE80211_IF_TYPE_STA:
322 case IEEE80211_IF_TYPE_IBSS:
323 sdata->u.sta.flags &= ~IEEE80211_STA_PREV_BSSID_SET;
324 /* fall through */
325 default:
326 conf.vif = &sdata->vif;
327 conf.type = sdata->vif.type;
328 conf.mac_addr = dev->dev_addr;
329 res = local->ops->add_interface(local_to_hw(local), &conf);
330 if (res)
331 goto err_stop;
332
333 ieee80211_if_config(dev);
334 ieee80211_reset_erp_info(dev);
335 ieee80211_enable_keys(sdata);
336
337 if (sdata->vif.type == IEEE80211_IF_TYPE_STA &&
338 !(sdata->flags & IEEE80211_SDATA_USERSPACE_MLME))
339 netif_carrier_off(dev);
340 else
341 netif_carrier_on(dev);
342 }
343
344 if (sdata->vif.type == IEEE80211_IF_TYPE_WDS) {
345 /* Create STA entry for the WDS peer */
346 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
347 GFP_KERNEL);
348 if (!sta) {
349 res = -ENOMEM;
350 goto err_del_interface;
351 }
352
353 /* no locking required since STA is not live yet */
354 sta->flags |= WLAN_STA_AUTHORIZED;
355
356 res = sta_info_insert(sta);
357 if (res) {
358 /* STA has been freed */
359 goto err_del_interface;
360 }
361 }
362
363 if (local->open_count == 0) {
364 res = dev_open(local->mdev);
365 WARN_ON(res);
366 if (res)
367 goto err_del_interface;
368 tasklet_enable(&local->tx_pending_tasklet);
369 tasklet_enable(&local->tasklet);
370 }
371
372 /*
373 * set_multicast_list will be invoked by the networking core
374 * which will check whether any increments here were done in
375 * error and sync them down to the hardware as filter flags.
376 */
377 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
378 atomic_inc(&local->iff_allmultis);
379
380 if (sdata->flags & IEEE80211_SDATA_PROMISC)
381 atomic_inc(&local->iff_promiscs);
382
383 local->open_count++;
384 if (need_hw_reconfig)
385 ieee80211_hw_config(local);
386
387 /*
388 * ieee80211_sta_work is disabled while network interface
389 * is down. Therefore, some configuration changes may not
390 * yet be effective. Trigger execution of ieee80211_sta_work
391 * to fix this.
392 */
393 if (sdata->vif.type == IEEE80211_IF_TYPE_STA ||
394 sdata->vif.type == IEEE80211_IF_TYPE_IBSS) {
395 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
396 queue_work(local->hw.workqueue, &ifsta->work);
397 }
398
399 netif_start_queue(dev);
400
401 return 0;
402 err_del_interface:
403 local->ops->remove_interface(local_to_hw(local), &conf);
404 err_stop:
405 if (!local->open_count && local->ops->stop)
406 local->ops->stop(local_to_hw(local));
407 return res;
408 }
409
410 static int ieee80211_stop(struct net_device *dev)
411 {
412 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
413 struct ieee80211_local *local = sdata->local;
414 struct ieee80211_if_init_conf conf;
415 struct sta_info *sta;
416
417 /*
418 * Stop TX on this interface first.
419 */
420 netif_stop_queue(dev);
421
422 /*
423 * Now delete all active aggregation sessions.
424 */
425 rcu_read_lock();
426
427 list_for_each_entry_rcu(sta, &local->sta_list, list) {
428 if (sta->sdata == sdata)
429 ieee80211_sta_tear_down_BA_sessions(dev, sta->addr);
430 }
431
432 rcu_read_unlock();
433
434 /*
435 * Remove all stations associated with this interface.
436 *
437 * This must be done before calling ops->remove_interface()
438 * because otherwise we can later invoke ops->sta_notify()
439 * whenever the STAs are removed, and that invalidates driver
440 * assumptions about always getting a vif pointer that is valid
441 * (because if we remove a STA after ops->remove_interface()
442 * the driver will have removed the vif info already!)
443 *
444 * We could relax this and only unlink the stations from the
445 * hash table and list but keep them on a per-sdata list that
446 * will be inserted back again when the interface is brought
447 * up again, but I don't currently see a use case for that,
448 * except with WDS which gets a STA entry created when it is
449 * brought up.
450 */
451 sta_info_flush(local, sdata);
452
453 /*
454 * Don't count this interface for promisc/allmulti while it
455 * is down. dev_mc_unsync() will invoke set_multicast_list
456 * on the master interface which will sync these down to the
457 * hardware as filter flags.
458 */
459 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
460 atomic_dec(&local->iff_allmultis);
461
462 if (sdata->flags & IEEE80211_SDATA_PROMISC)
463 atomic_dec(&local->iff_promiscs);
464
465 dev_mc_unsync(local->mdev, dev);
466
467 /* APs need special treatment */
468 if (sdata->vif.type == IEEE80211_IF_TYPE_AP) {
469 struct ieee80211_sub_if_data *vlan, *tmp;
470 struct beacon_data *old_beacon = sdata->u.ap.beacon;
471
472 /* remove beacon */
473 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
474 synchronize_rcu();
475 kfree(old_beacon);
476
477 /* down all dependent devices, that is VLANs */
478 list_for_each_entry_safe(vlan, tmp, &sdata->u.ap.vlans,
479 u.vlan.list)
480 dev_close(vlan->dev);
481 WARN_ON(!list_empty(&sdata->u.ap.vlans));
482 }
483
484 local->open_count--;
485
486 switch (sdata->vif.type) {
487 case IEEE80211_IF_TYPE_VLAN:
488 list_del(&sdata->u.vlan.list);
489 sdata->u.vlan.ap = NULL;
490 /* no need to tell driver */
491 break;
492 case IEEE80211_IF_TYPE_MNTR:
493 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
494 local->cooked_mntrs--;
495 break;
496 }
497
498 local->monitors--;
499 if (local->monitors == 0)
500 local->hw.conf.flags &= ~IEEE80211_CONF_RADIOTAP;
501
502 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
503 local->fif_fcsfail--;
504 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
505 local->fif_plcpfail--;
506 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL)
507 local->fif_control--;
508 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
509 local->fif_other_bss--;
510
511 netif_tx_lock_bh(local->mdev);
512 ieee80211_configure_filter(local);
513 netif_tx_unlock_bh(local->mdev);
514 break;
515 case IEEE80211_IF_TYPE_MESH_POINT:
516 case IEEE80211_IF_TYPE_STA:
517 case IEEE80211_IF_TYPE_IBSS:
518 sdata->u.sta.state = IEEE80211_DISABLED;
519 del_timer_sync(&sdata->u.sta.timer);
520 /*
521 * When we get here, the interface is marked down.
522 * Call synchronize_rcu() to wait for the RX path
523 * should it be using the interface and enqueuing
524 * frames at this very time on another CPU.
525 */
526 synchronize_rcu();
527 skb_queue_purge(&sdata->u.sta.skb_queue);
528
529 if (local->scan_dev == sdata->dev) {
530 if (!local->ops->hw_scan) {
531 local->sta_sw_scanning = 0;
532 cancel_delayed_work(&local->scan_work);
533 } else
534 local->sta_hw_scanning = 0;
535 }
536
537 flush_workqueue(local->hw.workqueue);
538
539 sdata->u.sta.flags &= ~IEEE80211_STA_PRIVACY_INVOKED;
540 kfree(sdata->u.sta.extra_ie);
541 sdata->u.sta.extra_ie = NULL;
542 sdata->u.sta.extra_ie_len = 0;
543 /* fall through */
544 default:
545 conf.vif = &sdata->vif;
546 conf.type = sdata->vif.type;
547 conf.mac_addr = dev->dev_addr;
548 /* disable all keys for as long as this netdev is down */
549 ieee80211_disable_keys(sdata);
550 local->ops->remove_interface(local_to_hw(local), &conf);
551 }
552
553 if (local->open_count == 0) {
554 if (netif_running(local->mdev))
555 dev_close(local->mdev);
556
557 if (local->ops->stop)
558 local->ops->stop(local_to_hw(local));
559
560 ieee80211_led_radio(local, 0);
561
562 tasklet_disable(&local->tx_pending_tasklet);
563 tasklet_disable(&local->tasklet);
564 }
565
566 return 0;
567 }
568
569 int ieee80211_start_tx_ba_session(struct ieee80211_hw *hw, u8 *ra, u16 tid)
570 {
571 struct ieee80211_local *local = hw_to_local(hw);
572 struct sta_info *sta;
573 struct ieee80211_sub_if_data *sdata;
574 u16 start_seq_num = 0;
575 u8 *state;
576 int ret;
577 DECLARE_MAC_BUF(mac);
578
579 if (tid >= STA_TID_NUM)
580 return -EINVAL;
581
582 #ifdef CONFIG_MAC80211_HT_DEBUG
583 printk(KERN_DEBUG "Open BA session requested for %s tid %u\n",
584 print_mac(mac, ra), tid);
585 #endif /* CONFIG_MAC80211_HT_DEBUG */
586
587 rcu_read_lock();
588
589 sta = sta_info_get(local, ra);
590 if (!sta) {
591 printk(KERN_DEBUG "Could not find the station\n");
592 ret = -ENOENT;
593 goto exit;
594 }
595
596 spin_lock_bh(&sta->lock);
597
598 /* we have tried too many times, receiver does not want A-MPDU */
599 if (sta->ampdu_mlme.addba_req_num[tid] > HT_AGG_MAX_RETRIES) {
600 ret = -EBUSY;
601 goto err_unlock_sta;
602 }
603
604 state = &sta->ampdu_mlme.tid_state_tx[tid];
605 /* check if the TID is not in aggregation flow already */
606 if (*state != HT_AGG_STATE_IDLE) {
607 #ifdef CONFIG_MAC80211_HT_DEBUG
608 printk(KERN_DEBUG "BA request denied - session is not "
609 "idle on tid %u\n", tid);
610 #endif /* CONFIG_MAC80211_HT_DEBUG */
611 ret = -EAGAIN;
612 goto err_unlock_sta;
613 }
614
615 /* prepare A-MPDU MLME for Tx aggregation */
616 sta->ampdu_mlme.tid_tx[tid] =
617 kmalloc(sizeof(struct tid_ampdu_tx), GFP_ATOMIC);
618 if (!sta->ampdu_mlme.tid_tx[tid]) {
619 if (net_ratelimit())
620 printk(KERN_ERR "allocate tx mlme to tid %d failed\n",
621 tid);
622 ret = -ENOMEM;
623 goto err_unlock_sta;
624 }
625 /* Tx timer */
626 sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.function =
627 sta_addba_resp_timer_expired;
628 sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.data =
629 (unsigned long)&sta->timer_to_tid[tid];
630 init_timer(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer);
631
632 /* ensure that TX flow won't interrupt us
633 * until the end of the call to requeue function */
634 spin_lock_bh(&local->mdev->queue_lock);
635
636 /* create a new queue for this aggregation */
637 ret = ieee80211_ht_agg_queue_add(local, sta, tid);
638
639 /* case no queue is available to aggregation
640 * don't switch to aggregation */
641 if (ret) {
642 #ifdef CONFIG_MAC80211_HT_DEBUG
643 printk(KERN_DEBUG "BA request denied - queue unavailable for"
644 " tid %d\n", tid);
645 #endif /* CONFIG_MAC80211_HT_DEBUG */
646 goto err_unlock_queue;
647 }
648 sdata = sta->sdata;
649
650 /* Ok, the Addba frame hasn't been sent yet, but if the driver calls the
651 * call back right away, it must see that the flow has begun */
652 *state |= HT_ADDBA_REQUESTED_MSK;
653
654 if (local->ops->ampdu_action)
655 ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_TX_START,
656 ra, tid, &start_seq_num);
657
658 if (ret) {
659 /* No need to requeue the packets in the agg queue, since we
660 * held the tx lock: no packet could be enqueued to the newly
661 * allocated queue */
662 ieee80211_ht_agg_queue_remove(local, sta, tid, 0);
663 #ifdef CONFIG_MAC80211_HT_DEBUG
664 printk(KERN_DEBUG "BA request denied - HW unavailable for"
665 " tid %d\n", tid);
666 #endif /* CONFIG_MAC80211_HT_DEBUG */
667 *state = HT_AGG_STATE_IDLE;
668 goto err_unlock_queue;
669 }
670
671 /* Will put all the packets in the new SW queue */
672 ieee80211_requeue(local, ieee802_1d_to_ac[tid]);
673 spin_unlock_bh(&local->mdev->queue_lock);
674 spin_unlock_bh(&sta->lock);
675
676 /* send an addBA request */
677 sta->ampdu_mlme.dialog_token_allocator++;
678 sta->ampdu_mlme.tid_tx[tid]->dialog_token =
679 sta->ampdu_mlme.dialog_token_allocator;
680 sta->ampdu_mlme.tid_tx[tid]->ssn = start_seq_num;
681
682
683 ieee80211_send_addba_request(sta->sdata->dev, ra, tid,
684 sta->ampdu_mlme.tid_tx[tid]->dialog_token,
685 sta->ampdu_mlme.tid_tx[tid]->ssn,
686 0x40, 5000);
687 /* activate the timer for the recipient's addBA response */
688 sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.expires =
689 jiffies + ADDBA_RESP_INTERVAL;
690 add_timer(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer);
691 printk(KERN_DEBUG "activated addBA response timer on tid %d\n", tid);
692 goto exit;
693
694 err_unlock_queue:
695 kfree(sta->ampdu_mlme.tid_tx[tid]);
696 sta->ampdu_mlme.tid_tx[tid] = NULL;
697 spin_unlock_bh(&local->mdev->queue_lock);
698 ret = -EBUSY;
699 err_unlock_sta:
700 spin_unlock_bh(&sta->lock);
701 exit:
702 rcu_read_unlock();
703 return ret;
704 }
705 EXPORT_SYMBOL(ieee80211_start_tx_ba_session);
706
707 int ieee80211_stop_tx_ba_session(struct ieee80211_hw *hw,
708 u8 *ra, u16 tid,
709 enum ieee80211_back_parties initiator)
710 {
711 struct ieee80211_local *local = hw_to_local(hw);
712 struct sta_info *sta;
713 u8 *state;
714 int ret = 0;
715 DECLARE_MAC_BUF(mac);
716
717 if (tid >= STA_TID_NUM)
718 return -EINVAL;
719
720 rcu_read_lock();
721 sta = sta_info_get(local, ra);
722 if (!sta) {
723 rcu_read_unlock();
724 return -ENOENT;
725 }
726
727 /* check if the TID is in aggregation */
728 state = &sta->ampdu_mlme.tid_state_tx[tid];
729 spin_lock_bh(&sta->lock);
730
731 if (*state != HT_AGG_STATE_OPERATIONAL) {
732 ret = -ENOENT;
733 goto stop_BA_exit;
734 }
735
736 #ifdef CONFIG_MAC80211_HT_DEBUG
737 printk(KERN_DEBUG "Tx BA session stop requested for %s tid %u\n",
738 print_mac(mac, ra), tid);
739 #endif /* CONFIG_MAC80211_HT_DEBUG */
740
741 ieee80211_stop_queue(hw, sta->tid_to_tx_q[tid]);
742
743 *state = HT_AGG_STATE_REQ_STOP_BA_MSK |
744 (initiator << HT_AGG_STATE_INITIATOR_SHIFT);
745
746 if (local->ops->ampdu_action)
747 ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_TX_STOP,
748 ra, tid, NULL);
749
750 /* case HW denied going back to legacy */
751 if (ret) {
752 WARN_ON(ret != -EBUSY);
753 *state = HT_AGG_STATE_OPERATIONAL;
754 ieee80211_wake_queue(hw, sta->tid_to_tx_q[tid]);
755 goto stop_BA_exit;
756 }
757
758 stop_BA_exit:
759 spin_unlock_bh(&sta->lock);
760 rcu_read_unlock();
761 return ret;
762 }
763 EXPORT_SYMBOL(ieee80211_stop_tx_ba_session);
764
765 void ieee80211_start_tx_ba_cb(struct ieee80211_hw *hw, u8 *ra, u16 tid)
766 {
767 struct ieee80211_local *local = hw_to_local(hw);
768 struct sta_info *sta;
769 u8 *state;
770 DECLARE_MAC_BUF(mac);
771
772 if (tid >= STA_TID_NUM) {
773 printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n",
774 tid, STA_TID_NUM);
775 return;
776 }
777
778 rcu_read_lock();
779 sta = sta_info_get(local, ra);
780 if (!sta) {
781 rcu_read_unlock();
782 printk(KERN_DEBUG "Could not find station: %s\n",
783 print_mac(mac, ra));
784 return;
785 }
786
787 state = &sta->ampdu_mlme.tid_state_tx[tid];
788 spin_lock_bh(&sta->lock);
789
790 if (!(*state & HT_ADDBA_REQUESTED_MSK)) {
791 printk(KERN_DEBUG "addBA was not requested yet, state is %d\n",
792 *state);
793 spin_unlock_bh(&sta->lock);
794 rcu_read_unlock();
795 return;
796 }
797
798 WARN_ON_ONCE(*state & HT_ADDBA_DRV_READY_MSK);
799
800 *state |= HT_ADDBA_DRV_READY_MSK;
801
802 if (*state == HT_AGG_STATE_OPERATIONAL) {
803 printk(KERN_DEBUG "Aggregation is on for tid %d \n", tid);
804 ieee80211_wake_queue(hw, sta->tid_to_tx_q[tid]);
805 }
806 spin_unlock_bh(&sta->lock);
807 rcu_read_unlock();
808 }
809 EXPORT_SYMBOL(ieee80211_start_tx_ba_cb);
810
811 void ieee80211_stop_tx_ba_cb(struct ieee80211_hw *hw, u8 *ra, u8 tid)
812 {
813 struct ieee80211_local *local = hw_to_local(hw);
814 struct sta_info *sta;
815 u8 *state;
816 int agg_queue;
817 DECLARE_MAC_BUF(mac);
818
819 if (tid >= STA_TID_NUM) {
820 printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n",
821 tid, STA_TID_NUM);
822 return;
823 }
824
825 #ifdef CONFIG_MAC80211_HT_DEBUG
826 printk(KERN_DEBUG "Stopping Tx BA session for %s tid %d\n",
827 print_mac(mac, ra), tid);
828 #endif /* CONFIG_MAC80211_HT_DEBUG */
829
830 rcu_read_lock();
831 sta = sta_info_get(local, ra);
832 if (!sta) {
833 printk(KERN_DEBUG "Could not find station: %s\n",
834 print_mac(mac, ra));
835 rcu_read_unlock();
836 return;
837 }
838 state = &sta->ampdu_mlme.tid_state_tx[tid];
839
840 /* NOTE: no need to use sta->lock in this state check, as
841 * ieee80211_stop_tx_ba_session will let only
842 * one stop call to pass through per sta/tid */
843 if ((*state & HT_AGG_STATE_REQ_STOP_BA_MSK) == 0) {
844 printk(KERN_DEBUG "unexpected callback to A-MPDU stop\n");
845 rcu_read_unlock();
846 return;
847 }
848
849 if (*state & HT_AGG_STATE_INITIATOR_MSK)
850 ieee80211_send_delba(sta->sdata->dev, ra, tid,
851 WLAN_BACK_INITIATOR, WLAN_REASON_QSTA_NOT_USE);
852
853 agg_queue = sta->tid_to_tx_q[tid];
854
855 /* avoid ordering issues: we are the only one that can modify
856 * the content of the qdiscs */
857 spin_lock_bh(&local->mdev->queue_lock);
858 /* remove the queue for this aggregation */
859 ieee80211_ht_agg_queue_remove(local, sta, tid, 1);
860 spin_unlock_bh(&local->mdev->queue_lock);
861
862 /* we just requeued the all the frames that were in the removed
863 * queue, and since we might miss a softirq we do netif_schedule.
864 * ieee80211_wake_queue is not used here as this queue is not
865 * necessarily stopped */
866 netif_schedule(local->mdev);
867 spin_lock_bh(&sta->lock);
868 *state = HT_AGG_STATE_IDLE;
869 sta->ampdu_mlme.addba_req_num[tid] = 0;
870 kfree(sta->ampdu_mlme.tid_tx[tid]);
871 sta->ampdu_mlme.tid_tx[tid] = NULL;
872 spin_unlock_bh(&sta->lock);
873
874 rcu_read_unlock();
875 }
876 EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb);
877
878 void ieee80211_start_tx_ba_cb_irqsafe(struct ieee80211_hw *hw,
879 const u8 *ra, u16 tid)
880 {
881 struct ieee80211_local *local = hw_to_local(hw);
882 struct ieee80211_ra_tid *ra_tid;
883 struct sk_buff *skb = dev_alloc_skb(0);
884
885 if (unlikely(!skb)) {
886 if (net_ratelimit())
887 printk(KERN_WARNING "%s: Not enough memory, "
888 "dropping start BA session", skb->dev->name);
889 return;
890 }
891 ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
892 memcpy(&ra_tid->ra, ra, ETH_ALEN);
893 ra_tid->tid = tid;
894
895 skb->pkt_type = IEEE80211_ADDBA_MSG;
896 skb_queue_tail(&local->skb_queue, skb);
897 tasklet_schedule(&local->tasklet);
898 }
899 EXPORT_SYMBOL(ieee80211_start_tx_ba_cb_irqsafe);
900
901 void ieee80211_stop_tx_ba_cb_irqsafe(struct ieee80211_hw *hw,
902 const u8 *ra, u16 tid)
903 {
904 struct ieee80211_local *local = hw_to_local(hw);
905 struct ieee80211_ra_tid *ra_tid;
906 struct sk_buff *skb = dev_alloc_skb(0);
907
908 if (unlikely(!skb)) {
909 if (net_ratelimit())
910 printk(KERN_WARNING "%s: Not enough memory, "
911 "dropping stop BA session", skb->dev->name);
912 return;
913 }
914 ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
915 memcpy(&ra_tid->ra, ra, ETH_ALEN);
916 ra_tid->tid = tid;
917
918 skb->pkt_type = IEEE80211_DELBA_MSG;
919 skb_queue_tail(&local->skb_queue, skb);
920 tasklet_schedule(&local->tasklet);
921 }
922 EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb_irqsafe);
923
924 static void ieee80211_set_multicast_list(struct net_device *dev)
925 {
926 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
927 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
928 int allmulti, promisc, sdata_allmulti, sdata_promisc;
929
930 allmulti = !!(dev->flags & IFF_ALLMULTI);
931 promisc = !!(dev->flags & IFF_PROMISC);
932 sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
933 sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
934
935 if (allmulti != sdata_allmulti) {
936 if (dev->flags & IFF_ALLMULTI)
937 atomic_inc(&local->iff_allmultis);
938 else
939 atomic_dec(&local->iff_allmultis);
940 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
941 }
942
943 if (promisc != sdata_promisc) {
944 if (dev->flags & IFF_PROMISC)
945 atomic_inc(&local->iff_promiscs);
946 else
947 atomic_dec(&local->iff_promiscs);
948 sdata->flags ^= IEEE80211_SDATA_PROMISC;
949 }
950
951 dev_mc_sync(local->mdev, dev);
952 }
953
954 static const struct header_ops ieee80211_header_ops = {
955 .create = eth_header,
956 .parse = header_parse_80211,
957 .rebuild = eth_rebuild_header,
958 .cache = eth_header_cache,
959 .cache_update = eth_header_cache_update,
960 };
961
962 /* Must not be called for mdev */
963 void ieee80211_if_setup(struct net_device *dev)
964 {
965 ether_setup(dev);
966 dev->hard_start_xmit = ieee80211_subif_start_xmit;
967 dev->wireless_handlers = &ieee80211_iw_handler_def;
968 dev->set_multicast_list = ieee80211_set_multicast_list;
969 dev->change_mtu = ieee80211_change_mtu;
970 dev->open = ieee80211_open;
971 dev->stop = ieee80211_stop;
972 dev->destructor = ieee80211_if_free;
973 }
974
975 /* everything else */
976
977 static int __ieee80211_if_config(struct net_device *dev,
978 struct sk_buff *beacon)
979 {
980 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
981 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
982 struct ieee80211_if_conf conf;
983
984 if (!local->ops->config_interface || !netif_running(dev))
985 return 0;
986
987 memset(&conf, 0, sizeof(conf));
988 conf.type = sdata->vif.type;
989 if (sdata->vif.type == IEEE80211_IF_TYPE_STA ||
990 sdata->vif.type == IEEE80211_IF_TYPE_IBSS) {
991 conf.bssid = sdata->u.sta.bssid;
992 conf.ssid = sdata->u.sta.ssid;
993 conf.ssid_len = sdata->u.sta.ssid_len;
994 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
995 conf.beacon = beacon;
996 ieee80211_start_mesh(dev);
997 } else if (sdata->vif.type == IEEE80211_IF_TYPE_AP) {
998 conf.ssid = sdata->u.ap.ssid;
999 conf.ssid_len = sdata->u.ap.ssid_len;
1000 conf.beacon = beacon;
1001 }
1002 return local->ops->config_interface(local_to_hw(local),
1003 &sdata->vif, &conf);
1004 }
1005
1006 int ieee80211_if_config(struct net_device *dev)
1007 {
1008 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1009 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1010 if (sdata->vif.type == IEEE80211_IF_TYPE_MESH_POINT &&
1011 (local->hw.flags & IEEE80211_HW_HOST_GEN_BEACON_TEMPLATE))
1012 return ieee80211_if_config_beacon(dev);
1013 return __ieee80211_if_config(dev, NULL);
1014 }
1015
1016 int ieee80211_if_config_beacon(struct net_device *dev)
1017 {
1018 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1019 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1020 struct sk_buff *skb;
1021
1022 if (!(local->hw.flags & IEEE80211_HW_HOST_GEN_BEACON_TEMPLATE))
1023 return 0;
1024 skb = ieee80211_beacon_get(local_to_hw(local), &sdata->vif);
1025 if (!skb)
1026 return -ENOMEM;
1027 return __ieee80211_if_config(dev, skb);
1028 }
1029
1030 int ieee80211_hw_config(struct ieee80211_local *local)
1031 {
1032 struct ieee80211_channel *chan;
1033 int ret = 0;
1034
1035 if (local->sta_sw_scanning)
1036 chan = local->scan_channel;
1037 else
1038 chan = local->oper_channel;
1039
1040 local->hw.conf.channel = chan;
1041
1042 if (!local->hw.conf.power_level)
1043 local->hw.conf.power_level = chan->max_power;
1044 else
1045 local->hw.conf.power_level = min(chan->max_power,
1046 local->hw.conf.power_level);
1047
1048 local->hw.conf.max_antenna_gain = chan->max_antenna_gain;
1049
1050 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1051 printk(KERN_DEBUG "%s: HW CONFIG: freq=%d\n",
1052 wiphy_name(local->hw.wiphy), chan->center_freq);
1053 #endif
1054
1055 if (local->open_count)
1056 ret = local->ops->config(local_to_hw(local), &local->hw.conf);
1057
1058 return ret;
1059 }
1060
1061 /**
1062 * ieee80211_handle_ht should be used only after legacy configuration
1063 * has been determined namely band, as ht configuration depends upon
1064 * the hardware's HT abilities for a _specific_ band.
1065 */
1066 u32 ieee80211_handle_ht(struct ieee80211_local *local, int enable_ht,
1067 struct ieee80211_ht_info *req_ht_cap,
1068 struct ieee80211_ht_bss_info *req_bss_cap)
1069 {
1070 struct ieee80211_conf *conf = &local->hw.conf;
1071 struct ieee80211_supported_band *sband;
1072 struct ieee80211_ht_info ht_conf;
1073 struct ieee80211_ht_bss_info ht_bss_conf;
1074 u32 changed = 0;
1075 int i;
1076 u8 max_tx_streams = IEEE80211_HT_CAP_MAX_STREAMS;
1077 u8 tx_mcs_set_cap;
1078
1079 sband = local->hw.wiphy->bands[conf->channel->band];
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 /* HT is not supported */
1085 if (!sband->ht_info.ht_supported) {
1086 conf->flags &= ~IEEE80211_CONF_SUPPORT_HT_MODE;
1087 goto out;
1088 }
1089
1090 /* disable HT */
1091 if (!enable_ht) {
1092 if (conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE)
1093 changed |= BSS_CHANGED_HT;
1094 conf->flags &= ~IEEE80211_CONF_SUPPORT_HT_MODE;
1095 conf->ht_conf.ht_supported = 0;
1096 goto out;
1097 }
1098
1099
1100 if (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE))
1101 changed |= BSS_CHANGED_HT;
1102
1103 conf->flags |= IEEE80211_CONF_SUPPORT_HT_MODE;
1104 ht_conf.ht_supported = 1;
1105
1106 ht_conf.cap = req_ht_cap->cap & sband->ht_info.cap;
1107 ht_conf.cap &= ~(IEEE80211_HT_CAP_MIMO_PS);
1108 ht_conf.cap |= sband->ht_info.cap & IEEE80211_HT_CAP_MIMO_PS;
1109 ht_bss_conf.primary_channel = req_bss_cap->primary_channel;
1110 ht_bss_conf.bss_cap = req_bss_cap->bss_cap;
1111 ht_bss_conf.bss_op_mode = req_bss_cap->bss_op_mode;
1112
1113 ht_conf.ampdu_factor = req_ht_cap->ampdu_factor;
1114 ht_conf.ampdu_density = req_ht_cap->ampdu_density;
1115
1116 /* Bits 96-100 */
1117 tx_mcs_set_cap = sband->ht_info.supp_mcs_set[12];
1118
1119 /* configure suppoerted Tx MCS according to requested MCS
1120 * (based in most cases on Rx capabilities of peer) and self
1121 * Tx MCS capabilities (as defined by low level driver HW
1122 * Tx capabilities) */
1123 if (!(tx_mcs_set_cap & IEEE80211_HT_CAP_MCS_TX_DEFINED))
1124 goto check_changed;
1125
1126 /* Counting from 0 therfore + 1 */
1127 if (tx_mcs_set_cap & IEEE80211_HT_CAP_MCS_TX_RX_DIFF)
1128 max_tx_streams = ((tx_mcs_set_cap &
1129 IEEE80211_HT_CAP_MCS_TX_STREAMS) >> 2) + 1;
1130
1131 for (i = 0; i < max_tx_streams; i++)
1132 ht_conf.supp_mcs_set[i] =
1133 sband->ht_info.supp_mcs_set[i] &
1134 req_ht_cap->supp_mcs_set[i];
1135
1136 if (tx_mcs_set_cap & IEEE80211_HT_CAP_MCS_TX_UEQM)
1137 for (i = IEEE80211_SUPP_MCS_SET_UEQM;
1138 i < IEEE80211_SUPP_MCS_SET_LEN; i++)
1139 ht_conf.supp_mcs_set[i] =
1140 sband->ht_info.supp_mcs_set[i] &
1141 req_ht_cap->supp_mcs_set[i];
1142
1143 check_changed:
1144 /* if bss configuration changed store the new one */
1145 if (memcmp(&conf->ht_conf, &ht_conf, sizeof(ht_conf)) ||
1146 memcmp(&conf->ht_bss_conf, &ht_bss_conf, sizeof(ht_bss_conf))) {
1147 changed |= BSS_CHANGED_HT;
1148 memcpy(&conf->ht_conf, &ht_conf, sizeof(ht_conf));
1149 memcpy(&conf->ht_bss_conf, &ht_bss_conf, sizeof(ht_bss_conf));
1150 }
1151 out:
1152 return changed;
1153 }
1154
1155 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
1156 u32 changed)
1157 {
1158 struct ieee80211_local *local = sdata->local;
1159
1160 if (!changed)
1161 return;
1162
1163 if (local->ops->bss_info_changed)
1164 local->ops->bss_info_changed(local_to_hw(local),
1165 &sdata->vif,
1166 &sdata->bss_conf,
1167 changed);
1168 }
1169
1170 void ieee80211_reset_erp_info(struct net_device *dev)
1171 {
1172 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1173
1174 sdata->bss_conf.use_cts_prot = 0;
1175 sdata->bss_conf.use_short_preamble = 0;
1176 ieee80211_bss_info_change_notify(sdata,
1177 BSS_CHANGED_ERP_CTS_PROT |
1178 BSS_CHANGED_ERP_PREAMBLE);
1179 }
1180
1181 void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
1182 struct sk_buff *skb)
1183 {
1184 struct ieee80211_local *local = hw_to_local(hw);
1185 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1186 int tmp;
1187
1188 skb->dev = local->mdev;
1189 skb->pkt_type = IEEE80211_TX_STATUS_MSG;
1190 skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ?
1191 &local->skb_queue : &local->skb_queue_unreliable, skb);
1192 tmp = skb_queue_len(&local->skb_queue) +
1193 skb_queue_len(&local->skb_queue_unreliable);
1194 while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
1195 (skb = skb_dequeue(&local->skb_queue_unreliable))) {
1196 dev_kfree_skb_irq(skb);
1197 tmp--;
1198 I802_DEBUG_INC(local->tx_status_drop);
1199 }
1200 tasklet_schedule(&local->tasklet);
1201 }
1202 EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
1203
1204 static void ieee80211_tasklet_handler(unsigned long data)
1205 {
1206 struct ieee80211_local *local = (struct ieee80211_local *) data;
1207 struct sk_buff *skb;
1208 struct ieee80211_rx_status rx_status;
1209 struct ieee80211_ra_tid *ra_tid;
1210
1211 while ((skb = skb_dequeue(&local->skb_queue)) ||
1212 (skb = skb_dequeue(&local->skb_queue_unreliable))) {
1213 switch (skb->pkt_type) {
1214 case IEEE80211_RX_MSG:
1215 /* status is in skb->cb */
1216 memcpy(&rx_status, skb->cb, sizeof(rx_status));
1217 /* Clear skb->pkt_type in order to not confuse kernel
1218 * netstack. */
1219 skb->pkt_type = 0;
1220 __ieee80211_rx(local_to_hw(local), skb, &rx_status);
1221 break;
1222 case IEEE80211_TX_STATUS_MSG:
1223 skb->pkt_type = 0;
1224 ieee80211_tx_status(local_to_hw(local), skb);
1225 break;
1226 case IEEE80211_DELBA_MSG:
1227 ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
1228 ieee80211_stop_tx_ba_cb(local_to_hw(local),
1229 ra_tid->ra, ra_tid->tid);
1230 dev_kfree_skb(skb);
1231 break;
1232 case IEEE80211_ADDBA_MSG:
1233 ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
1234 ieee80211_start_tx_ba_cb(local_to_hw(local),
1235 ra_tid->ra, ra_tid->tid);
1236 dev_kfree_skb(skb);
1237 break ;
1238 default: /* should never get here! */
1239 printk(KERN_ERR "%s: Unknown message type (%d)\n",
1240 wiphy_name(local->hw.wiphy), skb->pkt_type);
1241 dev_kfree_skb(skb);
1242 break;
1243 }
1244 }
1245 }
1246
1247 /* Remove added headers (e.g., QoS control), encryption header/MIC, etc. to
1248 * make a prepared TX frame (one that has been given to hw) to look like brand
1249 * new IEEE 802.11 frame that is ready to go through TX processing again.
1250 * Also, tx_packet_data in cb is restored from tx_control. */
1251 static void ieee80211_remove_tx_extra(struct ieee80211_local *local,
1252 struct ieee80211_key *key,
1253 struct sk_buff *skb)
1254 {
1255 int hdrlen, iv_len, mic_len;
1256 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1257
1258 info->flags &= IEEE80211_TX_CTL_REQ_TX_STATUS |
1259 IEEE80211_TX_CTL_DO_NOT_ENCRYPT |
1260 IEEE80211_TX_CTL_REQUEUE |
1261 IEEE80211_TX_CTL_EAPOL_FRAME;
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 {
1310 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1311
1312 sta->tx_filtered_count++;
1313
1314 /*
1315 * Clear the TX filter mask for this STA when sending the next
1316 * packet. If the STA went to power save mode, this will happen
1317 * happen when it wakes up for the next time.
1318 */
1319 set_sta_flags(sta, WLAN_STA_CLEAR_PS_FILT);
1320
1321 /*
1322 * This code races in the following way:
1323 *
1324 * (1) STA sends frame indicating it will go to sleep and does so
1325 * (2) hardware/firmware adds STA to filter list, passes frame up
1326 * (3) hardware/firmware processes TX fifo and suppresses a frame
1327 * (4) we get TX status before having processed the frame and
1328 * knowing that the STA has gone to sleep.
1329 *
1330 * This is actually quite unlikely even when both those events are
1331 * processed from interrupts coming in quickly after one another or
1332 * even at the same time because we queue both TX status events and
1333 * RX frames to be processed by a tasklet and process them in the
1334 * same order that they were received or TX status last. Hence, there
1335 * is no race as long as the frame RX is processed before the next TX
1336 * status, which drivers can ensure, see below.
1337 *
1338 * Note that this can only happen if the hardware or firmware can
1339 * actually add STAs to the filter list, if this is done by the
1340 * driver in response to set_tim() (which will only reduce the race
1341 * this whole filtering tries to solve, not completely solve it)
1342 * this situation cannot happen.
1343 *
1344 * To completely solve this race drivers need to make sure that they
1345 * (a) don't mix the irq-safe/not irq-safe TX status/RX processing
1346 * functions and
1347 * (b) always process RX events before TX status events if ordering
1348 * can be unknown, for example with different interrupt status
1349 * bits.
1350 */
1351 if (test_sta_flags(sta, WLAN_STA_PS) &&
1352 skb_queue_len(&sta->tx_filtered) < STA_MAX_TX_BUFFER) {
1353 ieee80211_remove_tx_extra(local, sta->key, skb);
1354 skb_queue_tail(&sta->tx_filtered, skb);
1355 return;
1356 }
1357
1358 if (!test_sta_flags(sta, WLAN_STA_PS) &&
1359 !(info->flags & IEEE80211_TX_CTL_REQUEUE)) {
1360 /* Software retry the packet once */
1361 info->flags |= IEEE80211_TX_CTL_REQUEUE;
1362 ieee80211_remove_tx_extra(local, sta->key, skb);
1363 dev_queue_xmit(skb);
1364 return;
1365 }
1366
1367 if (net_ratelimit())
1368 printk(KERN_DEBUG "%s: dropped TX filtered frame, "
1369 "queue_len=%d PS=%d @%lu\n",
1370 wiphy_name(local->hw.wiphy),
1371 skb_queue_len(&sta->tx_filtered),
1372 !!test_sta_flags(sta, WLAN_STA_PS), jiffies);
1373 dev_kfree_skb(skb);
1374 }
1375
1376 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
1377 {
1378 struct sk_buff *skb2;
1379 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1380 struct ieee80211_local *local = hw_to_local(hw);
1381 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1382 u16 frag, type;
1383 struct ieee80211_tx_status_rtap_hdr *rthdr;
1384 struct ieee80211_sub_if_data *sdata;
1385 struct net_device *prev_dev = NULL;
1386
1387 rcu_read_lock();
1388
1389 if (info->status.excessive_retries) {
1390 struct sta_info *sta;
1391 sta = sta_info_get(local, hdr->addr1);
1392 if (sta) {
1393 if (test_sta_flags(sta, WLAN_STA_PS)) {
1394 /*
1395 * The STA is in power save mode, so assume
1396 * that this TX packet failed because of that.
1397 */
1398 ieee80211_handle_filtered_frame(local, sta, skb);
1399 rcu_read_unlock();
1400 return;
1401 }
1402 }
1403 }
1404
1405 if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
1406 struct sta_info *sta;
1407 sta = sta_info_get(local, hdr->addr1);
1408 if (sta) {
1409 ieee80211_handle_filtered_frame(local, sta, skb);
1410 rcu_read_unlock();
1411 return;
1412 }
1413 } else
1414 rate_control_tx_status(local->mdev, skb);
1415
1416 rcu_read_unlock();
1417
1418 ieee80211_led_tx(local, 0);
1419
1420 /* SNMP counters
1421 * Fragments are passed to low-level drivers as separate skbs, so these
1422 * are actually fragments, not frames. Update frame counters only for
1423 * the first fragment of the frame. */
1424
1425 frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG;
1426 type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE;
1427
1428 if (info->flags & IEEE80211_TX_STAT_ACK) {
1429 if (frag == 0) {
1430 local->dot11TransmittedFrameCount++;
1431 if (is_multicast_ether_addr(hdr->addr1))
1432 local->dot11MulticastTransmittedFrameCount++;
1433 if (info->status.retry_count > 0)
1434 local->dot11RetryCount++;
1435 if (info->status.retry_count > 1)
1436 local->dot11MultipleRetryCount++;
1437 }
1438
1439 /* This counter shall be incremented for an acknowledged MPDU
1440 * with an individual address in the address 1 field or an MPDU
1441 * with a multicast address in the address 1 field of type Data
1442 * or Management. */
1443 if (!is_multicast_ether_addr(hdr->addr1) ||
1444 type == IEEE80211_FTYPE_DATA ||
1445 type == IEEE80211_FTYPE_MGMT)
1446 local->dot11TransmittedFragmentCount++;
1447 } else {
1448 if (frag == 0)
1449 local->dot11FailedCount++;
1450 }
1451
1452 /* this was a transmitted frame, but now we want to reuse it */
1453 skb_orphan(skb);
1454
1455 /*
1456 * This is a bit racy but we can avoid a lot of work
1457 * with this test...
1458 */
1459 if (!local->monitors && !local->cooked_mntrs) {
1460 dev_kfree_skb(skb);
1461 return;
1462 }
1463
1464 /* send frame to monitor interfaces now */
1465
1466 if (skb_headroom(skb) < sizeof(*rthdr)) {
1467 printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
1468 dev_kfree_skb(skb);
1469 return;
1470 }
1471
1472 rthdr = (struct ieee80211_tx_status_rtap_hdr *)
1473 skb_push(skb, sizeof(*rthdr));
1474
1475 memset(rthdr, 0, sizeof(*rthdr));
1476 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
1477 rthdr->hdr.it_present =
1478 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
1479 (1 << IEEE80211_RADIOTAP_DATA_RETRIES));
1480
1481 if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
1482 !is_multicast_ether_addr(hdr->addr1))
1483 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL);
1484
1485 if ((info->flags & IEEE80211_TX_CTL_USE_RTS_CTS) &&
1486 (info->flags & IEEE80211_TX_CTL_USE_CTS_PROTECT))
1487 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS);
1488 else if (info->flags & IEEE80211_TX_CTL_USE_RTS_CTS)
1489 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS);
1490
1491 rthdr->data_retries = info->status.retry_count;
1492
1493 /* XXX: is this sufficient for BPF? */
1494 skb_set_mac_header(skb, 0);
1495 skb->ip_summed = CHECKSUM_UNNECESSARY;
1496 skb->pkt_type = PACKET_OTHERHOST;
1497 skb->protocol = htons(ETH_P_802_2);
1498 memset(skb->cb, 0, sizeof(skb->cb));
1499
1500 rcu_read_lock();
1501 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
1502 if (sdata->vif.type == IEEE80211_IF_TYPE_MNTR) {
1503 if (!netif_running(sdata->dev))
1504 continue;
1505
1506 if (prev_dev) {
1507 skb2 = skb_clone(skb, GFP_ATOMIC);
1508 if (skb2) {
1509 skb2->dev = prev_dev;
1510 netif_rx(skb2);
1511 }
1512 }
1513
1514 prev_dev = sdata->dev;
1515 }
1516 }
1517 if (prev_dev) {
1518 skb->dev = prev_dev;
1519 netif_rx(skb);
1520 skb = NULL;
1521 }
1522 rcu_read_unlock();
1523 dev_kfree_skb(skb);
1524 }
1525 EXPORT_SYMBOL(ieee80211_tx_status);
1526
1527 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
1528 const struct ieee80211_ops *ops)
1529 {
1530 struct ieee80211_local *local;
1531 int priv_size;
1532 struct wiphy *wiphy;
1533
1534 /* Ensure 32-byte alignment of our private data and hw private data.
1535 * We use the wiphy priv data for both our ieee80211_local and for
1536 * the driver's private data
1537 *
1538 * In memory it'll be like this:
1539 *
1540 * +-------------------------+
1541 * | struct wiphy |
1542 * +-------------------------+
1543 * | struct ieee80211_local |
1544 * +-------------------------+
1545 * | driver's private data |
1546 * +-------------------------+
1547 *
1548 */
1549 priv_size = ((sizeof(struct ieee80211_local) +
1550 NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST) +
1551 priv_data_len;
1552
1553 wiphy = wiphy_new(&mac80211_config_ops, priv_size);
1554
1555 if (!wiphy)
1556 return NULL;
1557
1558 wiphy->privid = mac80211_wiphy_privid;
1559
1560 local = wiphy_priv(wiphy);
1561 local->hw.wiphy = wiphy;
1562
1563 local->hw.priv = (char *)local +
1564 ((sizeof(struct ieee80211_local) +
1565 NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);
1566
1567 BUG_ON(!ops->tx);
1568 BUG_ON(!ops->start);
1569 BUG_ON(!ops->stop);
1570 BUG_ON(!ops->config);
1571 BUG_ON(!ops->add_interface);
1572 BUG_ON(!ops->remove_interface);
1573 BUG_ON(!ops->configure_filter);
1574 local->ops = ops;
1575
1576 local->hw.queues = 1; /* default */
1577
1578 local->bridge_packets = 1;
1579
1580 local->rts_threshold = IEEE80211_MAX_RTS_THRESHOLD;
1581 local->fragmentation_threshold = IEEE80211_MAX_FRAG_THRESHOLD;
1582 local->short_retry_limit = 7;
1583 local->long_retry_limit = 4;
1584 local->hw.conf.radio_enabled = 1;
1585
1586 INIT_LIST_HEAD(&local->interfaces);
1587
1588 spin_lock_init(&local->key_lock);
1589
1590 INIT_DELAYED_WORK(&local->scan_work, ieee80211_sta_scan_work);
1591
1592 sta_info_init(local);
1593
1594 tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
1595 (unsigned long)local);
1596 tasklet_disable(&local->tx_pending_tasklet);
1597
1598 tasklet_init(&local->tasklet,
1599 ieee80211_tasklet_handler,
1600 (unsigned long) local);
1601 tasklet_disable(&local->tasklet);
1602
1603 skb_queue_head_init(&local->skb_queue);
1604 skb_queue_head_init(&local->skb_queue_unreliable);
1605
1606 return local_to_hw(local);
1607 }
1608 EXPORT_SYMBOL(ieee80211_alloc_hw);
1609
1610 int ieee80211_register_hw(struct ieee80211_hw *hw)
1611 {
1612 struct ieee80211_local *local = hw_to_local(hw);
1613 const char *name;
1614 int result;
1615 enum ieee80211_band band;
1616 struct net_device *mdev;
1617 struct ieee80211_sub_if_data *sdata;
1618
1619 /*
1620 * generic code guarantees at least one band,
1621 * set this very early because much code assumes
1622 * that hw.conf.channel is assigned
1623 */
1624 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1625 struct ieee80211_supported_band *sband;
1626
1627 sband = local->hw.wiphy->bands[band];
1628 if (sband) {
1629 /* init channel we're on */
1630 local->hw.conf.channel =
1631 local->oper_channel =
1632 local->scan_channel = &sband->channels[0];
1633 break;
1634 }
1635 }
1636
1637 result = wiphy_register(local->hw.wiphy);
1638 if (result < 0)
1639 return result;
1640
1641 /*
1642 * We use the number of queues for feature tests (QoS, HT) internally
1643 * so restrict them appropriately.
1644 */
1645 #ifdef CONFIG_MAC80211_QOS
1646 if (hw->queues > IEEE80211_MAX_QUEUES)
1647 hw->queues = IEEE80211_MAX_QUEUES;
1648 if (hw->ampdu_queues > IEEE80211_MAX_AMPDU_QUEUES)
1649 hw->ampdu_queues = IEEE80211_MAX_AMPDU_QUEUES;
1650 if (hw->queues < 4)
1651 hw->ampdu_queues = 0;
1652 #else
1653 hw->queues = 1;
1654 hw->ampdu_queues = 0;
1655 #endif
1656
1657 /* for now, mdev needs sub_if_data :/ */
1658 mdev = alloc_netdev_mq(sizeof(struct ieee80211_sub_if_data),
1659 "wmaster%d", ether_setup,
1660 ieee80211_num_queues(hw));
1661 if (!mdev)
1662 goto fail_mdev_alloc;
1663
1664 if (ieee80211_num_queues(hw) > 1)
1665 mdev->features |= NETIF_F_MULTI_QUEUE;
1666
1667 sdata = IEEE80211_DEV_TO_SUB_IF(mdev);
1668 mdev->ieee80211_ptr = &sdata->wdev;
1669 sdata->wdev.wiphy = local->hw.wiphy;
1670
1671 local->mdev = mdev;
1672
1673 ieee80211_rx_bss_list_init(mdev);
1674
1675 mdev->hard_start_xmit = ieee80211_master_start_xmit;
1676 mdev->open = ieee80211_master_open;
1677 mdev->stop = ieee80211_master_stop;
1678 mdev->type = ARPHRD_IEEE80211;
1679 mdev->header_ops = &ieee80211_header_ops;
1680 mdev->set_multicast_list = ieee80211_master_set_multicast_list;
1681
1682 sdata->vif.type = IEEE80211_IF_TYPE_AP;
1683 sdata->dev = mdev;
1684 sdata->local = local;
1685 sdata->u.ap.force_unicast_rateidx = -1;
1686 sdata->u.ap.max_ratectrl_rateidx = -1;
1687 ieee80211_if_sdata_init(sdata);
1688
1689 /* no RCU needed since we're still during init phase */
1690 list_add_tail(&sdata->list, &local->interfaces);
1691
1692 name = wiphy_dev(local->hw.wiphy)->driver->name;
1693 local->hw.workqueue = create_singlethread_workqueue(name);
1694 if (!local->hw.workqueue) {
1695 result = -ENOMEM;
1696 goto fail_workqueue;
1697 }
1698
1699 /*
1700 * The hardware needs headroom for sending the frame,
1701 * and we need some headroom for passing the frame to monitor
1702 * interfaces, but never both at the same time.
1703 */
1704 local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
1705 sizeof(struct ieee80211_tx_status_rtap_hdr));
1706
1707 debugfs_hw_add(local);
1708
1709 local->hw.conf.beacon_int = 1000;
1710
1711 local->wstats_flags |= local->hw.flags & (IEEE80211_HW_SIGNAL_UNSPEC |
1712 IEEE80211_HW_SIGNAL_DB |
1713 IEEE80211_HW_SIGNAL_DBM) ?
1714 IW_QUAL_QUAL_UPDATED : IW_QUAL_QUAL_INVALID;
1715 local->wstats_flags |= local->hw.flags & IEEE80211_HW_NOISE_DBM ?
1716 IW_QUAL_NOISE_UPDATED : IW_QUAL_NOISE_INVALID;
1717 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
1718 local->wstats_flags |= IW_QUAL_DBM;
1719
1720 result = sta_info_start(local);
1721 if (result < 0)
1722 goto fail_sta_info;
1723
1724 rtnl_lock();
1725 result = dev_alloc_name(local->mdev, local->mdev->name);
1726 if (result < 0)
1727 goto fail_dev;
1728
1729 memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1730 SET_NETDEV_DEV(local->mdev, wiphy_dev(local->hw.wiphy));
1731
1732 result = register_netdevice(local->mdev);
1733 if (result < 0)
1734 goto fail_dev;
1735
1736 ieee80211_debugfs_add_netdev(IEEE80211_DEV_TO_SUB_IF(local->mdev));
1737 ieee80211_if_set_type(local->mdev, IEEE80211_IF_TYPE_AP);
1738
1739 result = ieee80211_init_rate_ctrl_alg(local,
1740 hw->rate_control_algorithm);
1741 if (result < 0) {
1742 printk(KERN_DEBUG "%s: Failed to initialize rate control "
1743 "algorithm\n", wiphy_name(local->hw.wiphy));
1744 goto fail_rate;
1745 }
1746
1747 result = ieee80211_wep_init(local);
1748
1749 if (result < 0) {
1750 printk(KERN_DEBUG "%s: Failed to initialize wep\n",
1751 wiphy_name(local->hw.wiphy));
1752 goto fail_wep;
1753 }
1754
1755 ieee80211_install_qdisc(local->mdev);
1756
1757 /* add one default STA interface */
1758 result = ieee80211_if_add(local->mdev, "wlan%d", NULL,
1759 IEEE80211_IF_TYPE_STA, NULL);
1760 if (result)
1761 printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
1762 wiphy_name(local->hw.wiphy));
1763
1764 local->reg_state = IEEE80211_DEV_REGISTERED;
1765 rtnl_unlock();
1766
1767 ieee80211_led_init(local);
1768
1769 return 0;
1770
1771 fail_wep:
1772 rate_control_deinitialize(local);
1773 fail_rate:
1774 ieee80211_debugfs_remove_netdev(IEEE80211_DEV_TO_SUB_IF(local->mdev));
1775 unregister_netdevice(local->mdev);
1776 local->mdev = NULL;
1777 fail_dev:
1778 rtnl_unlock();
1779 sta_info_stop(local);
1780 fail_sta_info:
1781 debugfs_hw_del(local);
1782 destroy_workqueue(local->hw.workqueue);
1783 fail_workqueue:
1784 if (local->mdev != NULL) {
1785 ieee80211_if_free(local->mdev);
1786 local->mdev = NULL;
1787 }
1788 fail_mdev_alloc:
1789 wiphy_unregister(local->hw.wiphy);
1790 return result;
1791 }
1792 EXPORT_SYMBOL(ieee80211_register_hw);
1793
1794 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
1795 {
1796 struct ieee80211_local *local = hw_to_local(hw);
1797 struct ieee80211_sub_if_data *sdata, *tmp;
1798
1799 tasklet_kill(&local->tx_pending_tasklet);
1800 tasklet_kill(&local->tasklet);
1801
1802 rtnl_lock();
1803
1804 BUG_ON(local->reg_state != IEEE80211_DEV_REGISTERED);
1805
1806 local->reg_state = IEEE80211_DEV_UNREGISTERED;
1807
1808 /*
1809 * At this point, interface list manipulations are fine
1810 * because the driver cannot be handing us frames any
1811 * more and the tasklet is killed.
1812 */
1813
1814 /*
1815 * First, we remove all non-master interfaces. Do this because they
1816 * may have bss pointer dependency on the master, and when we free
1817 * the master these would be freed as well, breaking our list
1818 * iteration completely.
1819 */
1820 list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1821 if (sdata->dev == local->mdev)
1822 continue;
1823 list_del(&sdata->list);
1824 __ieee80211_if_del(local, sdata);
1825 }
1826
1827 /* then, finally, remove the master interface */
1828 __ieee80211_if_del(local, IEEE80211_DEV_TO_SUB_IF(local->mdev));
1829
1830 rtnl_unlock();
1831
1832 ieee80211_rx_bss_list_deinit(local->mdev);
1833 ieee80211_clear_tx_pending(local);
1834 sta_info_stop(local);
1835 rate_control_deinitialize(local);
1836 debugfs_hw_del(local);
1837
1838 if (skb_queue_len(&local->skb_queue)
1839 || skb_queue_len(&local->skb_queue_unreliable))
1840 printk(KERN_WARNING "%s: skb_queue not empty\n",
1841 wiphy_name(local->hw.wiphy));
1842 skb_queue_purge(&local->skb_queue);
1843 skb_queue_purge(&local->skb_queue_unreliable);
1844
1845 destroy_workqueue(local->hw.workqueue);
1846 wiphy_unregister(local->hw.wiphy);
1847 ieee80211_wep_free(local);
1848 ieee80211_led_exit(local);
1849 ieee80211_if_free(local->mdev);
1850 local->mdev = NULL;
1851 }
1852 EXPORT_SYMBOL(ieee80211_unregister_hw);
1853
1854 void ieee80211_free_hw(struct ieee80211_hw *hw)
1855 {
1856 struct ieee80211_local *local = hw_to_local(hw);
1857
1858 wiphy_free(local->hw.wiphy);
1859 }
1860 EXPORT_SYMBOL(ieee80211_free_hw);
1861
1862 static int __init ieee80211_init(void)
1863 {
1864 struct sk_buff *skb;
1865 int ret;
1866
1867 BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1868 BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1869 IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1870
1871 ret = rc80211_pid_init();
1872 if (ret)
1873 goto out;
1874
1875 ret = ieee80211_wme_register();
1876 if (ret) {
1877 printk(KERN_DEBUG "ieee80211_init: failed to "
1878 "initialize WME (err=%d)\n", ret);
1879 goto out_cleanup_pid;
1880 }
1881
1882 ieee80211_debugfs_netdev_init();
1883
1884 return 0;
1885
1886 out_cleanup_pid:
1887 rc80211_pid_exit();
1888 out:
1889 return ret;
1890 }
1891
1892 static void __exit ieee80211_exit(void)
1893 {
1894 rc80211_pid_exit();
1895
1896 /*
1897 * For key todo, it'll be empty by now but the work
1898 * might still be scheduled.
1899 */
1900 flush_scheduled_work();
1901
1902 if (mesh_allocated)
1903 ieee80211s_stop();
1904
1905 ieee80211_wme_unregister();
1906 ieee80211_debugfs_netdev_exit();
1907 }
1908
1909
1910 subsys_initcall(ieee80211_init);
1911 module_exit(ieee80211_exit);
1912
1913 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1914 MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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