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mac80211: use multi-queue master netdevice
[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 rcu_read_unlock();
593 return -ENOENT;
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 start_ba_exit;
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 start_ba_exit;
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 start_ba_exit;
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 start_ba_err;
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 start_ba_err;
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
675 /* send an addBA request */
676 sta->ampdu_mlme.dialog_token_allocator++;
677 sta->ampdu_mlme.tid_tx[tid]->dialog_token =
678 sta->ampdu_mlme.dialog_token_allocator;
679 sta->ampdu_mlme.tid_tx[tid]->ssn = start_seq_num;
680
681 ieee80211_send_addba_request(sta->sdata->dev, ra, tid,
682 sta->ampdu_mlme.tid_tx[tid]->dialog_token,
683 sta->ampdu_mlme.tid_tx[tid]->ssn,
684 0x40, 5000);
685
686 /* activate the timer for the recipient's addBA response */
687 sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.expires =
688 jiffies + ADDBA_RESP_INTERVAL;
689 add_timer(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer);
690 printk(KERN_DEBUG "activated addBA response timer on tid %d\n", tid);
691 goto start_ba_exit;
692
693 start_ba_err:
694 kfree(sta->ampdu_mlme.tid_tx[tid]);
695 sta->ampdu_mlme.tid_tx[tid] = NULL;
696 spin_unlock_bh(&local->mdev->queue_lock);
697 ret = -EBUSY;
698 start_ba_exit:
699 spin_unlock_bh(&sta->lock);
700 rcu_read_unlock();
701 return ret;
702 }
703 EXPORT_SYMBOL(ieee80211_start_tx_ba_session);
704
705 int ieee80211_stop_tx_ba_session(struct ieee80211_hw *hw,
706 u8 *ra, u16 tid,
707 enum ieee80211_back_parties initiator)
708 {
709 struct ieee80211_local *local = hw_to_local(hw);
710 struct sta_info *sta;
711 u8 *state;
712 int ret = 0;
713 DECLARE_MAC_BUF(mac);
714
715 if (tid >= STA_TID_NUM)
716 return -EINVAL;
717
718 rcu_read_lock();
719 sta = sta_info_get(local, ra);
720 if (!sta) {
721 rcu_read_unlock();
722 return -ENOENT;
723 }
724
725 /* check if the TID is in aggregation */
726 state = &sta->ampdu_mlme.tid_state_tx[tid];
727 spin_lock_bh(&sta->lock);
728
729 if (*state != HT_AGG_STATE_OPERATIONAL) {
730 ret = -ENOENT;
731 goto stop_BA_exit;
732 }
733
734 #ifdef CONFIG_MAC80211_HT_DEBUG
735 printk(KERN_DEBUG "Tx BA session stop requested for %s tid %u\n",
736 print_mac(mac, ra), tid);
737 #endif /* CONFIG_MAC80211_HT_DEBUG */
738
739 ieee80211_stop_queue(hw, sta->tid_to_tx_q[tid]);
740
741 *state = HT_AGG_STATE_REQ_STOP_BA_MSK |
742 (initiator << HT_AGG_STATE_INITIATOR_SHIFT);
743
744 if (local->ops->ampdu_action)
745 ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_TX_STOP,
746 ra, tid, NULL);
747
748 /* case HW denied going back to legacy */
749 if (ret) {
750 WARN_ON(ret != -EBUSY);
751 *state = HT_AGG_STATE_OPERATIONAL;
752 ieee80211_wake_queue(hw, sta->tid_to_tx_q[tid]);
753 goto stop_BA_exit;
754 }
755
756 stop_BA_exit:
757 spin_unlock_bh(&sta->lock);
758 rcu_read_unlock();
759 return ret;
760 }
761 EXPORT_SYMBOL(ieee80211_stop_tx_ba_session);
762
763 void ieee80211_start_tx_ba_cb(struct ieee80211_hw *hw, u8 *ra, u16 tid)
764 {
765 struct ieee80211_local *local = hw_to_local(hw);
766 struct sta_info *sta;
767 u8 *state;
768 DECLARE_MAC_BUF(mac);
769
770 if (tid >= STA_TID_NUM) {
771 printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n",
772 tid, STA_TID_NUM);
773 return;
774 }
775
776 rcu_read_lock();
777 sta = sta_info_get(local, ra);
778 if (!sta) {
779 rcu_read_unlock();
780 printk(KERN_DEBUG "Could not find station: %s\n",
781 print_mac(mac, ra));
782 return;
783 }
784
785 state = &sta->ampdu_mlme.tid_state_tx[tid];
786 spin_lock_bh(&sta->lock);
787
788 if (!(*state & HT_ADDBA_REQUESTED_MSK)) {
789 printk(KERN_DEBUG "addBA was not requested yet, state is %d\n",
790 *state);
791 spin_unlock_bh(&sta->lock);
792 rcu_read_unlock();
793 return;
794 }
795
796 WARN_ON_ONCE(*state & HT_ADDBA_DRV_READY_MSK);
797
798 *state |= HT_ADDBA_DRV_READY_MSK;
799
800 if (*state == HT_AGG_STATE_OPERATIONAL) {
801 printk(KERN_DEBUG "Aggregation is on for tid %d \n", tid);
802 ieee80211_wake_queue(hw, sta->tid_to_tx_q[tid]);
803 }
804 spin_unlock_bh(&sta->lock);
805 rcu_read_unlock();
806 }
807 EXPORT_SYMBOL(ieee80211_start_tx_ba_cb);
808
809 void ieee80211_stop_tx_ba_cb(struct ieee80211_hw *hw, u8 *ra, u8 tid)
810 {
811 struct ieee80211_local *local = hw_to_local(hw);
812 struct sta_info *sta;
813 u8 *state;
814 int agg_queue;
815 DECLARE_MAC_BUF(mac);
816
817 if (tid >= STA_TID_NUM) {
818 printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n",
819 tid, STA_TID_NUM);
820 return;
821 }
822
823 #ifdef CONFIG_MAC80211_HT_DEBUG
824 printk(KERN_DEBUG "Stopping Tx BA session for %s tid %d\n",
825 print_mac(mac, ra), tid);
826 #endif /* CONFIG_MAC80211_HT_DEBUG */
827
828 rcu_read_lock();
829 sta = sta_info_get(local, ra);
830 if (!sta) {
831 printk(KERN_DEBUG "Could not find station: %s\n",
832 print_mac(mac, ra));
833 rcu_read_unlock();
834 return;
835 }
836 state = &sta->ampdu_mlme.tid_state_tx[tid];
837
838 spin_lock_bh(&sta->lock);
839 if ((*state & HT_AGG_STATE_REQ_STOP_BA_MSK) == 0) {
840 printk(KERN_DEBUG "unexpected callback to A-MPDU stop\n");
841 spin_unlock_bh(&sta->lock);
842 rcu_read_unlock();
843 return;
844 }
845
846 if (*state & HT_AGG_STATE_INITIATOR_MSK)
847 ieee80211_send_delba(sta->sdata->dev, ra, tid,
848 WLAN_BACK_INITIATOR, WLAN_REASON_QSTA_NOT_USE);
849
850 agg_queue = sta->tid_to_tx_q[tid];
851
852 /* avoid ordering issues: we are the only one that can modify
853 * the content of the qdiscs */
854 spin_lock_bh(&local->mdev->queue_lock);
855 /* remove the queue for this aggregation */
856 ieee80211_ht_agg_queue_remove(local, sta, tid, 1);
857 spin_unlock_bh(&local->mdev->queue_lock);
858
859 /* we just requeued the all the frames that were in the removed
860 * queue, and since we might miss a softirq we do netif_schedule.
861 * ieee80211_wake_queue is not used here as this queue is not
862 * necessarily stopped */
863 netif_schedule(local->mdev);
864 *state = HT_AGG_STATE_IDLE;
865 sta->ampdu_mlme.addba_req_num[tid] = 0;
866 kfree(sta->ampdu_mlme.tid_tx[tid]);
867 sta->ampdu_mlme.tid_tx[tid] = NULL;
868 spin_unlock_bh(&sta->lock);
869
870 rcu_read_unlock();
871 }
872 EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb);
873
874 void ieee80211_start_tx_ba_cb_irqsafe(struct ieee80211_hw *hw,
875 const u8 *ra, u16 tid)
876 {
877 struct ieee80211_local *local = hw_to_local(hw);
878 struct ieee80211_ra_tid *ra_tid;
879 struct sk_buff *skb = dev_alloc_skb(0);
880
881 if (unlikely(!skb)) {
882 if (net_ratelimit())
883 printk(KERN_WARNING "%s: Not enough memory, "
884 "dropping start BA session", skb->dev->name);
885 return;
886 }
887 ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
888 memcpy(&ra_tid->ra, ra, ETH_ALEN);
889 ra_tid->tid = tid;
890
891 skb->pkt_type = IEEE80211_ADDBA_MSG;
892 skb_queue_tail(&local->skb_queue, skb);
893 tasklet_schedule(&local->tasklet);
894 }
895 EXPORT_SYMBOL(ieee80211_start_tx_ba_cb_irqsafe);
896
897 void ieee80211_stop_tx_ba_cb_irqsafe(struct ieee80211_hw *hw,
898 const u8 *ra, u16 tid)
899 {
900 struct ieee80211_local *local = hw_to_local(hw);
901 struct ieee80211_ra_tid *ra_tid;
902 struct sk_buff *skb = dev_alloc_skb(0);
903
904 if (unlikely(!skb)) {
905 if (net_ratelimit())
906 printk(KERN_WARNING "%s: Not enough memory, "
907 "dropping stop BA session", skb->dev->name);
908 return;
909 }
910 ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
911 memcpy(&ra_tid->ra, ra, ETH_ALEN);
912 ra_tid->tid = tid;
913
914 skb->pkt_type = IEEE80211_DELBA_MSG;
915 skb_queue_tail(&local->skb_queue, skb);
916 tasklet_schedule(&local->tasklet);
917 }
918 EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb_irqsafe);
919
920 static void ieee80211_set_multicast_list(struct net_device *dev)
921 {
922 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
923 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
924 int allmulti, promisc, sdata_allmulti, sdata_promisc;
925
926 allmulti = !!(dev->flags & IFF_ALLMULTI);
927 promisc = !!(dev->flags & IFF_PROMISC);
928 sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
929 sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
930
931 if (allmulti != sdata_allmulti) {
932 if (dev->flags & IFF_ALLMULTI)
933 atomic_inc(&local->iff_allmultis);
934 else
935 atomic_dec(&local->iff_allmultis);
936 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
937 }
938
939 if (promisc != sdata_promisc) {
940 if (dev->flags & IFF_PROMISC)
941 atomic_inc(&local->iff_promiscs);
942 else
943 atomic_dec(&local->iff_promiscs);
944 sdata->flags ^= IEEE80211_SDATA_PROMISC;
945 }
946
947 dev_mc_sync(local->mdev, dev);
948 }
949
950 static const struct header_ops ieee80211_header_ops = {
951 .create = eth_header,
952 .parse = header_parse_80211,
953 .rebuild = eth_rebuild_header,
954 .cache = eth_header_cache,
955 .cache_update = eth_header_cache_update,
956 };
957
958 /* Must not be called for mdev */
959 void ieee80211_if_setup(struct net_device *dev)
960 {
961 ether_setup(dev);
962 dev->hard_start_xmit = ieee80211_subif_start_xmit;
963 dev->wireless_handlers = &ieee80211_iw_handler_def;
964 dev->set_multicast_list = ieee80211_set_multicast_list;
965 dev->change_mtu = ieee80211_change_mtu;
966 dev->open = ieee80211_open;
967 dev->stop = ieee80211_stop;
968 dev->destructor = ieee80211_if_free;
969 }
970
971 /* everything else */
972
973 static int __ieee80211_if_config(struct net_device *dev,
974 struct sk_buff *beacon)
975 {
976 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
977 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
978 struct ieee80211_if_conf conf;
979
980 if (!local->ops->config_interface || !netif_running(dev))
981 return 0;
982
983 memset(&conf, 0, sizeof(conf));
984 conf.type = sdata->vif.type;
985 if (sdata->vif.type == IEEE80211_IF_TYPE_STA ||
986 sdata->vif.type == IEEE80211_IF_TYPE_IBSS) {
987 conf.bssid = sdata->u.sta.bssid;
988 conf.ssid = sdata->u.sta.ssid;
989 conf.ssid_len = sdata->u.sta.ssid_len;
990 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
991 conf.beacon = beacon;
992 ieee80211_start_mesh(dev);
993 } else if (sdata->vif.type == IEEE80211_IF_TYPE_AP) {
994 conf.ssid = sdata->u.ap.ssid;
995 conf.ssid_len = sdata->u.ap.ssid_len;
996 conf.beacon = beacon;
997 }
998 return local->ops->config_interface(local_to_hw(local),
999 &sdata->vif, &conf);
1000 }
1001
1002 int ieee80211_if_config(struct net_device *dev)
1003 {
1004 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1005 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1006 if (sdata->vif.type == IEEE80211_IF_TYPE_MESH_POINT &&
1007 (local->hw.flags & IEEE80211_HW_HOST_GEN_BEACON_TEMPLATE))
1008 return ieee80211_if_config_beacon(dev);
1009 return __ieee80211_if_config(dev, NULL);
1010 }
1011
1012 int ieee80211_if_config_beacon(struct net_device *dev)
1013 {
1014 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1015 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1016 struct sk_buff *skb;
1017
1018 if (!(local->hw.flags & IEEE80211_HW_HOST_GEN_BEACON_TEMPLATE))
1019 return 0;
1020 skb = ieee80211_beacon_get(local_to_hw(local), &sdata->vif);
1021 if (!skb)
1022 return -ENOMEM;
1023 return __ieee80211_if_config(dev, skb);
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 u32 changed = 0;
1071 int i;
1072 u8 max_tx_streams = IEEE80211_HT_CAP_MAX_STREAMS;
1073 u8 tx_mcs_set_cap;
1074
1075 sband = local->hw.wiphy->bands[conf->channel->band];
1076
1077 memset(&ht_conf, 0, sizeof(struct ieee80211_ht_info));
1078 memset(&ht_bss_conf, 0, sizeof(struct ieee80211_ht_bss_info));
1079
1080 /* HT is not supported */
1081 if (!sband->ht_info.ht_supported) {
1082 conf->flags &= ~IEEE80211_CONF_SUPPORT_HT_MODE;
1083 goto out;
1084 }
1085
1086 /* disable HT */
1087 if (!enable_ht) {
1088 if (conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE)
1089 changed |= BSS_CHANGED_HT;
1090 conf->flags &= ~IEEE80211_CONF_SUPPORT_HT_MODE;
1091 conf->ht_conf.ht_supported = 0;
1092 goto out;
1093 }
1094
1095
1096 if (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE))
1097 changed |= BSS_CHANGED_HT;
1098
1099 conf->flags |= IEEE80211_CONF_SUPPORT_HT_MODE;
1100 ht_conf.ht_supported = 1;
1101
1102 ht_conf.cap = req_ht_cap->cap & sband->ht_info.cap;
1103 ht_conf.cap &= ~(IEEE80211_HT_CAP_MIMO_PS);
1104 ht_conf.cap |= sband->ht_info.cap & IEEE80211_HT_CAP_MIMO_PS;
1105 ht_bss_conf.primary_channel = req_bss_cap->primary_channel;
1106 ht_bss_conf.bss_cap = req_bss_cap->bss_cap;
1107 ht_bss_conf.bss_op_mode = req_bss_cap->bss_op_mode;
1108
1109 ht_conf.ampdu_factor = req_ht_cap->ampdu_factor;
1110 ht_conf.ampdu_density = req_ht_cap->ampdu_density;
1111
1112 /* Bits 96-100 */
1113 tx_mcs_set_cap = sband->ht_info.supp_mcs_set[12];
1114
1115 /* configure suppoerted Tx MCS according to requested MCS
1116 * (based in most cases on Rx capabilities of peer) and self
1117 * Tx MCS capabilities (as defined by low level driver HW
1118 * Tx capabilities) */
1119 if (!(tx_mcs_set_cap & IEEE80211_HT_CAP_MCS_TX_DEFINED))
1120 goto check_changed;
1121
1122 /* Counting from 0 therfore + 1 */
1123 if (tx_mcs_set_cap & IEEE80211_HT_CAP_MCS_TX_RX_DIFF)
1124 max_tx_streams = ((tx_mcs_set_cap &
1125 IEEE80211_HT_CAP_MCS_TX_STREAMS) >> 2) + 1;
1126
1127 for (i = 0; i < max_tx_streams; i++)
1128 ht_conf.supp_mcs_set[i] =
1129 sband->ht_info.supp_mcs_set[i] &
1130 req_ht_cap->supp_mcs_set[i];
1131
1132 if (tx_mcs_set_cap & IEEE80211_HT_CAP_MCS_TX_UEQM)
1133 for (i = IEEE80211_SUPP_MCS_SET_UEQM;
1134 i < IEEE80211_SUPP_MCS_SET_LEN; i++)
1135 ht_conf.supp_mcs_set[i] =
1136 sband->ht_info.supp_mcs_set[i] &
1137 req_ht_cap->supp_mcs_set[i];
1138
1139 check_changed:
1140 /* if bss configuration changed store the new one */
1141 if (memcmp(&conf->ht_conf, &ht_conf, sizeof(ht_conf)) ||
1142 memcmp(&conf->ht_bss_conf, &ht_bss_conf, sizeof(ht_bss_conf))) {
1143 changed |= BSS_CHANGED_HT;
1144 memcpy(&conf->ht_conf, &ht_conf, sizeof(ht_conf));
1145 memcpy(&conf->ht_bss_conf, &ht_bss_conf, sizeof(ht_bss_conf));
1146 }
1147 out:
1148 return changed;
1149 }
1150
1151 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
1152 u32 changed)
1153 {
1154 struct ieee80211_local *local = sdata->local;
1155
1156 if (!changed)
1157 return;
1158
1159 if (local->ops->bss_info_changed)
1160 local->ops->bss_info_changed(local_to_hw(local),
1161 &sdata->vif,
1162 &sdata->bss_conf,
1163 changed);
1164 }
1165
1166 void ieee80211_reset_erp_info(struct net_device *dev)
1167 {
1168 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1169
1170 sdata->bss_conf.use_cts_prot = 0;
1171 sdata->bss_conf.use_short_preamble = 0;
1172 ieee80211_bss_info_change_notify(sdata,
1173 BSS_CHANGED_ERP_CTS_PROT |
1174 BSS_CHANGED_ERP_PREAMBLE);
1175 }
1176
1177 void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
1178 struct sk_buff *skb)
1179 {
1180 struct ieee80211_local *local = hw_to_local(hw);
1181 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1182 int tmp;
1183
1184 skb->dev = local->mdev;
1185 skb->pkt_type = IEEE80211_TX_STATUS_MSG;
1186 skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ?
1187 &local->skb_queue : &local->skb_queue_unreliable, skb);
1188 tmp = skb_queue_len(&local->skb_queue) +
1189 skb_queue_len(&local->skb_queue_unreliable);
1190 while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
1191 (skb = skb_dequeue(&local->skb_queue_unreliable))) {
1192 dev_kfree_skb_irq(skb);
1193 tmp--;
1194 I802_DEBUG_INC(local->tx_status_drop);
1195 }
1196 tasklet_schedule(&local->tasklet);
1197 }
1198 EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
1199
1200 static void ieee80211_tasklet_handler(unsigned long data)
1201 {
1202 struct ieee80211_local *local = (struct ieee80211_local *) data;
1203 struct sk_buff *skb;
1204 struct ieee80211_rx_status rx_status;
1205 struct ieee80211_ra_tid *ra_tid;
1206
1207 while ((skb = skb_dequeue(&local->skb_queue)) ||
1208 (skb = skb_dequeue(&local->skb_queue_unreliable))) {
1209 switch (skb->pkt_type) {
1210 case IEEE80211_RX_MSG:
1211 /* status is in skb->cb */
1212 memcpy(&rx_status, skb->cb, sizeof(rx_status));
1213 /* Clear skb->pkt_type in order to not confuse kernel
1214 * netstack. */
1215 skb->pkt_type = 0;
1216 __ieee80211_rx(local_to_hw(local), skb, &rx_status);
1217 break;
1218 case IEEE80211_TX_STATUS_MSG:
1219 skb->pkt_type = 0;
1220 ieee80211_tx_status(local_to_hw(local), skb);
1221 break;
1222 case IEEE80211_DELBA_MSG:
1223 ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
1224 ieee80211_stop_tx_ba_cb(local_to_hw(local),
1225 ra_tid->ra, ra_tid->tid);
1226 dev_kfree_skb(skb);
1227 break;
1228 case IEEE80211_ADDBA_MSG:
1229 ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
1230 ieee80211_start_tx_ba_cb(local_to_hw(local),
1231 ra_tid->ra, ra_tid->tid);
1232 dev_kfree_skb(skb);
1233 break ;
1234 default: /* should never get here! */
1235 printk(KERN_ERR "%s: Unknown message type (%d)\n",
1236 wiphy_name(local->hw.wiphy), skb->pkt_type);
1237 dev_kfree_skb(skb);
1238 break;
1239 }
1240 }
1241 }
1242
1243 /* Remove added headers (e.g., QoS control), encryption header/MIC, etc. to
1244 * make a prepared TX frame (one that has been given to hw) to look like brand
1245 * new IEEE 802.11 frame that is ready to go through TX processing again.
1246 * Also, tx_packet_data in cb is restored from tx_control. */
1247 static void ieee80211_remove_tx_extra(struct ieee80211_local *local,
1248 struct ieee80211_key *key,
1249 struct sk_buff *skb)
1250 {
1251 int hdrlen, iv_len, mic_len;
1252 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1253
1254 info->flags &= IEEE80211_TX_CTL_REQ_TX_STATUS |
1255 IEEE80211_TX_CTL_DO_NOT_ENCRYPT |
1256 IEEE80211_TX_CTL_REQUEUE |
1257 IEEE80211_TX_CTL_EAPOL_FRAME;
1258
1259 hdrlen = ieee80211_get_hdrlen_from_skb(skb);
1260
1261 if (!key)
1262 goto no_key;
1263
1264 switch (key->conf.alg) {
1265 case ALG_WEP:
1266 iv_len = WEP_IV_LEN;
1267 mic_len = WEP_ICV_LEN;
1268 break;
1269 case ALG_TKIP:
1270 iv_len = TKIP_IV_LEN;
1271 mic_len = TKIP_ICV_LEN;
1272 break;
1273 case ALG_CCMP:
1274 iv_len = CCMP_HDR_LEN;
1275 mic_len = CCMP_MIC_LEN;
1276 break;
1277 default:
1278 goto no_key;
1279 }
1280
1281 if (skb->len >= mic_len &&
1282 !(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
1283 skb_trim(skb, skb->len - mic_len);
1284 if (skb->len >= iv_len && skb->len > hdrlen) {
1285 memmove(skb->data + iv_len, skb->data, hdrlen);
1286 skb_pull(skb, iv_len);
1287 }
1288
1289 no_key:
1290 {
1291 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1292 u16 fc = le16_to_cpu(hdr->frame_control);
1293 if ((fc & 0x8C) == 0x88) /* QoS Control Field */ {
1294 fc &= ~IEEE80211_STYPE_QOS_DATA;
1295 hdr->frame_control = cpu_to_le16(fc);
1296 memmove(skb->data + 2, skb->data, hdrlen - 2);
1297 skb_pull(skb, 2);
1298 }
1299 }
1300 }
1301
1302 static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
1303 struct sta_info *sta,
1304 struct sk_buff *skb)
1305 {
1306 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1307
1308 sta->tx_filtered_count++;
1309
1310 /*
1311 * Clear the TX filter mask for this STA when sending the next
1312 * packet. If the STA went to power save mode, this will happen
1313 * happen when it wakes up for the next time.
1314 */
1315 set_sta_flags(sta, WLAN_STA_CLEAR_PS_FILT);
1316
1317 /*
1318 * This code races in the following way:
1319 *
1320 * (1) STA sends frame indicating it will go to sleep and does so
1321 * (2) hardware/firmware adds STA to filter list, passes frame up
1322 * (3) hardware/firmware processes TX fifo and suppresses a frame
1323 * (4) we get TX status before having processed the frame and
1324 * knowing that the STA has gone to sleep.
1325 *
1326 * This is actually quite unlikely even when both those events are
1327 * processed from interrupts coming in quickly after one another or
1328 * even at the same time because we queue both TX status events and
1329 * RX frames to be processed by a tasklet and process them in the
1330 * same order that they were received or TX status last. Hence, there
1331 * is no race as long as the frame RX is processed before the next TX
1332 * status, which drivers can ensure, see below.
1333 *
1334 * Note that this can only happen if the hardware or firmware can
1335 * actually add STAs to the filter list, if this is done by the
1336 * driver in response to set_tim() (which will only reduce the race
1337 * this whole filtering tries to solve, not completely solve it)
1338 * this situation cannot happen.
1339 *
1340 * To completely solve this race drivers need to make sure that they
1341 * (a) don't mix the irq-safe/not irq-safe TX status/RX processing
1342 * functions and
1343 * (b) always process RX events before TX status events if ordering
1344 * can be unknown, for example with different interrupt status
1345 * bits.
1346 */
1347 if (test_sta_flags(sta, WLAN_STA_PS) &&
1348 skb_queue_len(&sta->tx_filtered) < STA_MAX_TX_BUFFER) {
1349 ieee80211_remove_tx_extra(local, sta->key, skb);
1350 skb_queue_tail(&sta->tx_filtered, skb);
1351 return;
1352 }
1353
1354 if (!test_sta_flags(sta, WLAN_STA_PS) &&
1355 !(info->flags & IEEE80211_TX_CTL_REQUEUE)) {
1356 /* Software retry the packet once */
1357 info->flags |= IEEE80211_TX_CTL_REQUEUE;
1358 ieee80211_remove_tx_extra(local, sta->key, skb);
1359 dev_queue_xmit(skb);
1360 return;
1361 }
1362
1363 if (net_ratelimit())
1364 printk(KERN_DEBUG "%s: dropped TX filtered frame, "
1365 "queue_len=%d PS=%d @%lu\n",
1366 wiphy_name(local->hw.wiphy),
1367 skb_queue_len(&sta->tx_filtered),
1368 !!test_sta_flags(sta, WLAN_STA_PS), jiffies);
1369 dev_kfree_skb(skb);
1370 }
1371
1372 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
1373 {
1374 struct sk_buff *skb2;
1375 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1376 struct ieee80211_local *local = hw_to_local(hw);
1377 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1378 u16 frag, type;
1379 struct ieee80211_tx_status_rtap_hdr *rthdr;
1380 struct ieee80211_sub_if_data *sdata;
1381 struct net_device *prev_dev = NULL;
1382
1383 rcu_read_lock();
1384
1385 if (info->status.excessive_retries) {
1386 struct sta_info *sta;
1387 sta = sta_info_get(local, hdr->addr1);
1388 if (sta) {
1389 if (test_sta_flags(sta, WLAN_STA_PS)) {
1390 /*
1391 * The STA is in power save mode, so assume
1392 * that this TX packet failed because of that.
1393 */
1394 ieee80211_handle_filtered_frame(local, sta, skb);
1395 rcu_read_unlock();
1396 return;
1397 }
1398 }
1399 }
1400
1401 if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
1402 struct sta_info *sta;
1403 sta = sta_info_get(local, hdr->addr1);
1404 if (sta) {
1405 ieee80211_handle_filtered_frame(local, sta, skb);
1406 rcu_read_unlock();
1407 return;
1408 }
1409 } else
1410 rate_control_tx_status(local->mdev, skb);
1411
1412 rcu_read_unlock();
1413
1414 ieee80211_led_tx(local, 0);
1415
1416 /* SNMP counters
1417 * Fragments are passed to low-level drivers as separate skbs, so these
1418 * are actually fragments, not frames. Update frame counters only for
1419 * the first fragment of the frame. */
1420
1421 frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG;
1422 type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE;
1423
1424 if (info->flags & IEEE80211_TX_STAT_ACK) {
1425 if (frag == 0) {
1426 local->dot11TransmittedFrameCount++;
1427 if (is_multicast_ether_addr(hdr->addr1))
1428 local->dot11MulticastTransmittedFrameCount++;
1429 if (info->status.retry_count > 0)
1430 local->dot11RetryCount++;
1431 if (info->status.retry_count > 1)
1432 local->dot11MultipleRetryCount++;
1433 }
1434
1435 /* This counter shall be incremented for an acknowledged MPDU
1436 * with an individual address in the address 1 field or an MPDU
1437 * with a multicast address in the address 1 field of type Data
1438 * or Management. */
1439 if (!is_multicast_ether_addr(hdr->addr1) ||
1440 type == IEEE80211_FTYPE_DATA ||
1441 type == IEEE80211_FTYPE_MGMT)
1442 local->dot11TransmittedFragmentCount++;
1443 } else {
1444 if (frag == 0)
1445 local->dot11FailedCount++;
1446 }
1447
1448 /* this was a transmitted frame, but now we want to reuse it */
1449 skb_orphan(skb);
1450
1451 /*
1452 * This is a bit racy but we can avoid a lot of work
1453 * with this test...
1454 */
1455 if (!local->monitors && !local->cooked_mntrs) {
1456 dev_kfree_skb(skb);
1457 return;
1458 }
1459
1460 /* send frame to monitor interfaces now */
1461
1462 if (skb_headroom(skb) < sizeof(*rthdr)) {
1463 printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
1464 dev_kfree_skb(skb);
1465 return;
1466 }
1467
1468 rthdr = (struct ieee80211_tx_status_rtap_hdr *)
1469 skb_push(skb, sizeof(*rthdr));
1470
1471 memset(rthdr, 0, sizeof(*rthdr));
1472 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
1473 rthdr->hdr.it_present =
1474 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
1475 (1 << IEEE80211_RADIOTAP_DATA_RETRIES));
1476
1477 if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
1478 !is_multicast_ether_addr(hdr->addr1))
1479 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL);
1480
1481 if ((info->flags & IEEE80211_TX_CTL_USE_RTS_CTS) &&
1482 (info->flags & IEEE80211_TX_CTL_USE_CTS_PROTECT))
1483 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS);
1484 else if (info->flags & IEEE80211_TX_CTL_USE_RTS_CTS)
1485 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS);
1486
1487 rthdr->data_retries = info->status.retry_count;
1488
1489 /* XXX: is this sufficient for BPF? */
1490 skb_set_mac_header(skb, 0);
1491 skb->ip_summed = CHECKSUM_UNNECESSARY;
1492 skb->pkt_type = PACKET_OTHERHOST;
1493 skb->protocol = htons(ETH_P_802_2);
1494 memset(skb->cb, 0, sizeof(skb->cb));
1495
1496 rcu_read_lock();
1497 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
1498 if (sdata->vif.type == IEEE80211_IF_TYPE_MNTR) {
1499 if (!netif_running(sdata->dev))
1500 continue;
1501
1502 if (prev_dev) {
1503 skb2 = skb_clone(skb, GFP_ATOMIC);
1504 if (skb2) {
1505 skb2->dev = prev_dev;
1506 netif_rx(skb2);
1507 }
1508 }
1509
1510 prev_dev = sdata->dev;
1511 }
1512 }
1513 if (prev_dev) {
1514 skb->dev = prev_dev;
1515 netif_rx(skb);
1516 skb = NULL;
1517 }
1518 rcu_read_unlock();
1519 dev_kfree_skb(skb);
1520 }
1521 EXPORT_SYMBOL(ieee80211_tx_status);
1522
1523 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
1524 const struct ieee80211_ops *ops)
1525 {
1526 struct ieee80211_local *local;
1527 int priv_size;
1528 struct wiphy *wiphy;
1529
1530 /* Ensure 32-byte alignment of our private data and hw private data.
1531 * We use the wiphy priv data for both our ieee80211_local and for
1532 * the driver's private data
1533 *
1534 * In memory it'll be like this:
1535 *
1536 * +-------------------------+
1537 * | struct wiphy |
1538 * +-------------------------+
1539 * | struct ieee80211_local |
1540 * +-------------------------+
1541 * | driver's private data |
1542 * +-------------------------+
1543 *
1544 */
1545 priv_size = ((sizeof(struct ieee80211_local) +
1546 NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST) +
1547 priv_data_len;
1548
1549 wiphy = wiphy_new(&mac80211_config_ops, priv_size);
1550
1551 if (!wiphy)
1552 return NULL;
1553
1554 wiphy->privid = mac80211_wiphy_privid;
1555
1556 local = wiphy_priv(wiphy);
1557 local->hw.wiphy = wiphy;
1558
1559 local->hw.priv = (char *)local +
1560 ((sizeof(struct ieee80211_local) +
1561 NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);
1562
1563 BUG_ON(!ops->tx);
1564 BUG_ON(!ops->start);
1565 BUG_ON(!ops->stop);
1566 BUG_ON(!ops->config);
1567 BUG_ON(!ops->add_interface);
1568 BUG_ON(!ops->remove_interface);
1569 BUG_ON(!ops->configure_filter);
1570 local->ops = ops;
1571
1572 local->hw.queues = 1; /* default */
1573
1574 local->bridge_packets = 1;
1575
1576 local->rts_threshold = IEEE80211_MAX_RTS_THRESHOLD;
1577 local->fragmentation_threshold = IEEE80211_MAX_FRAG_THRESHOLD;
1578 local->short_retry_limit = 7;
1579 local->long_retry_limit = 4;
1580 local->hw.conf.radio_enabled = 1;
1581
1582 INIT_LIST_HEAD(&local->interfaces);
1583
1584 spin_lock_init(&local->key_lock);
1585
1586 INIT_DELAYED_WORK(&local->scan_work, ieee80211_sta_scan_work);
1587
1588 sta_info_init(local);
1589
1590 tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
1591 (unsigned long)local);
1592 tasklet_disable(&local->tx_pending_tasklet);
1593
1594 tasklet_init(&local->tasklet,
1595 ieee80211_tasklet_handler,
1596 (unsigned long) local);
1597 tasklet_disable(&local->tasklet);
1598
1599 skb_queue_head_init(&local->skb_queue);
1600 skb_queue_head_init(&local->skb_queue_unreliable);
1601
1602 return local_to_hw(local);
1603 }
1604 EXPORT_SYMBOL(ieee80211_alloc_hw);
1605
1606 int ieee80211_register_hw(struct ieee80211_hw *hw)
1607 {
1608 struct ieee80211_local *local = hw_to_local(hw);
1609 const char *name;
1610 int result;
1611 enum ieee80211_band band;
1612 struct net_device *mdev;
1613 struct ieee80211_sub_if_data *sdata;
1614
1615 /*
1616 * generic code guarantees at least one band,
1617 * set this very early because much code assumes
1618 * that hw.conf.channel is assigned
1619 */
1620 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1621 struct ieee80211_supported_band *sband;
1622
1623 sband = local->hw.wiphy->bands[band];
1624 if (sband) {
1625 /* init channel we're on */
1626 local->hw.conf.channel =
1627 local->oper_channel =
1628 local->scan_channel = &sband->channels[0];
1629 break;
1630 }
1631 }
1632
1633 result = wiphy_register(local->hw.wiphy);
1634 if (result < 0)
1635 return result;
1636
1637 /*
1638 * We use the number of queues for feature tests (QoS, HT) internally
1639 * so restrict them appropriately.
1640 */
1641 #ifdef CONFIG_MAC80211_QOS
1642 if (hw->queues > IEEE80211_MAX_QUEUES)
1643 hw->queues = IEEE80211_MAX_QUEUES;
1644 if (hw->ampdu_queues > IEEE80211_MAX_AMPDU_QUEUES)
1645 hw->ampdu_queues = IEEE80211_MAX_AMPDU_QUEUES;
1646 if (hw->queues < 4)
1647 hw->ampdu_queues = 0;
1648 #else
1649 hw->queues = 1;
1650 hw->ampdu_queues = 0;
1651 #endif
1652
1653 /* for now, mdev needs sub_if_data :/ */
1654 mdev = alloc_netdev_mq(sizeof(struct ieee80211_sub_if_data),
1655 "wmaster%d", ether_setup,
1656 ieee80211_num_queues(hw));
1657 if (!mdev)
1658 goto fail_mdev_alloc;
1659
1660 if (ieee80211_num_queues(hw) > 1)
1661 mdev->features |= NETIF_F_MULTI_QUEUE;
1662
1663 sdata = IEEE80211_DEV_TO_SUB_IF(mdev);
1664 mdev->ieee80211_ptr = &sdata->wdev;
1665 sdata->wdev.wiphy = local->hw.wiphy;
1666
1667 local->mdev = mdev;
1668
1669 ieee80211_rx_bss_list_init(mdev);
1670
1671 mdev->hard_start_xmit = ieee80211_master_start_xmit;
1672 mdev->open = ieee80211_master_open;
1673 mdev->stop = ieee80211_master_stop;
1674 mdev->type = ARPHRD_IEEE80211;
1675 mdev->header_ops = &ieee80211_header_ops;
1676 mdev->set_multicast_list = ieee80211_master_set_multicast_list;
1677
1678 sdata->vif.type = IEEE80211_IF_TYPE_AP;
1679 sdata->dev = mdev;
1680 sdata->local = local;
1681 sdata->u.ap.force_unicast_rateidx = -1;
1682 sdata->u.ap.max_ratectrl_rateidx = -1;
1683 ieee80211_if_sdata_init(sdata);
1684
1685 /* no RCU needed since we're still during init phase */
1686 list_add_tail(&sdata->list, &local->interfaces);
1687
1688 name = wiphy_dev(local->hw.wiphy)->driver->name;
1689 local->hw.workqueue = create_singlethread_workqueue(name);
1690 if (!local->hw.workqueue) {
1691 result = -ENOMEM;
1692 goto fail_workqueue;
1693 }
1694
1695 /*
1696 * The hardware needs headroom for sending the frame,
1697 * and we need some headroom for passing the frame to monitor
1698 * interfaces, but never both at the same time.
1699 */
1700 local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
1701 sizeof(struct ieee80211_tx_status_rtap_hdr));
1702
1703 debugfs_hw_add(local);
1704
1705 local->hw.conf.beacon_int = 1000;
1706
1707 local->wstats_flags |= local->hw.flags & (IEEE80211_HW_SIGNAL_UNSPEC |
1708 IEEE80211_HW_SIGNAL_DB |
1709 IEEE80211_HW_SIGNAL_DBM) ?
1710 IW_QUAL_QUAL_UPDATED : IW_QUAL_QUAL_INVALID;
1711 local->wstats_flags |= local->hw.flags & IEEE80211_HW_NOISE_DBM ?
1712 IW_QUAL_NOISE_UPDATED : IW_QUAL_NOISE_INVALID;
1713 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
1714 local->wstats_flags |= IW_QUAL_DBM;
1715
1716 result = sta_info_start(local);
1717 if (result < 0)
1718 goto fail_sta_info;
1719
1720 rtnl_lock();
1721 result = dev_alloc_name(local->mdev, local->mdev->name);
1722 if (result < 0)
1723 goto fail_dev;
1724
1725 memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1726 SET_NETDEV_DEV(local->mdev, wiphy_dev(local->hw.wiphy));
1727
1728 result = register_netdevice(local->mdev);
1729 if (result < 0)
1730 goto fail_dev;
1731
1732 ieee80211_debugfs_add_netdev(IEEE80211_DEV_TO_SUB_IF(local->mdev));
1733 ieee80211_if_set_type(local->mdev, IEEE80211_IF_TYPE_AP);
1734
1735 result = ieee80211_init_rate_ctrl_alg(local,
1736 hw->rate_control_algorithm);
1737 if (result < 0) {
1738 printk(KERN_DEBUG "%s: Failed to initialize rate control "
1739 "algorithm\n", wiphy_name(local->hw.wiphy));
1740 goto fail_rate;
1741 }
1742
1743 result = ieee80211_wep_init(local);
1744
1745 if (result < 0) {
1746 printk(KERN_DEBUG "%s: Failed to initialize wep\n",
1747 wiphy_name(local->hw.wiphy));
1748 goto fail_wep;
1749 }
1750
1751 ieee80211_install_qdisc(local->mdev);
1752
1753 /* add one default STA interface */
1754 result = ieee80211_if_add(local->mdev, "wlan%d", NULL,
1755 IEEE80211_IF_TYPE_STA, NULL);
1756 if (result)
1757 printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
1758 wiphy_name(local->hw.wiphy));
1759
1760 local->reg_state = IEEE80211_DEV_REGISTERED;
1761 rtnl_unlock();
1762
1763 ieee80211_led_init(local);
1764
1765 return 0;
1766
1767 fail_wep:
1768 rate_control_deinitialize(local);
1769 fail_rate:
1770 ieee80211_debugfs_remove_netdev(IEEE80211_DEV_TO_SUB_IF(local->mdev));
1771 unregister_netdevice(local->mdev);
1772 local->mdev = NULL;
1773 fail_dev:
1774 rtnl_unlock();
1775 sta_info_stop(local);
1776 fail_sta_info:
1777 debugfs_hw_del(local);
1778 destroy_workqueue(local->hw.workqueue);
1779 fail_workqueue:
1780 if (local->mdev != NULL) {
1781 ieee80211_if_free(local->mdev);
1782 local->mdev = NULL;
1783 }
1784 fail_mdev_alloc:
1785 wiphy_unregister(local->hw.wiphy);
1786 return result;
1787 }
1788 EXPORT_SYMBOL(ieee80211_register_hw);
1789
1790 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
1791 {
1792 struct ieee80211_local *local = hw_to_local(hw);
1793 struct ieee80211_sub_if_data *sdata, *tmp;
1794
1795 tasklet_kill(&local->tx_pending_tasklet);
1796 tasklet_kill(&local->tasklet);
1797
1798 rtnl_lock();
1799
1800 BUG_ON(local->reg_state != IEEE80211_DEV_REGISTERED);
1801
1802 local->reg_state = IEEE80211_DEV_UNREGISTERED;
1803
1804 /*
1805 * At this point, interface list manipulations are fine
1806 * because the driver cannot be handing us frames any
1807 * more and the tasklet is killed.
1808 */
1809
1810 /*
1811 * First, we remove all non-master interfaces. Do this because they
1812 * may have bss pointer dependency on the master, and when we free
1813 * the master these would be freed as well, breaking our list
1814 * iteration completely.
1815 */
1816 list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1817 if (sdata->dev == local->mdev)
1818 continue;
1819 list_del(&sdata->list);
1820 __ieee80211_if_del(local, sdata);
1821 }
1822
1823 /* then, finally, remove the master interface */
1824 __ieee80211_if_del(local, IEEE80211_DEV_TO_SUB_IF(local->mdev));
1825
1826 rtnl_unlock();
1827
1828 ieee80211_rx_bss_list_deinit(local->mdev);
1829 ieee80211_clear_tx_pending(local);
1830 sta_info_stop(local);
1831 rate_control_deinitialize(local);
1832 debugfs_hw_del(local);
1833
1834 if (skb_queue_len(&local->skb_queue)
1835 || skb_queue_len(&local->skb_queue_unreliable))
1836 printk(KERN_WARNING "%s: skb_queue not empty\n",
1837 wiphy_name(local->hw.wiphy));
1838 skb_queue_purge(&local->skb_queue);
1839 skb_queue_purge(&local->skb_queue_unreliable);
1840
1841 destroy_workqueue(local->hw.workqueue);
1842 wiphy_unregister(local->hw.wiphy);
1843 ieee80211_wep_free(local);
1844 ieee80211_led_exit(local);
1845 ieee80211_if_free(local->mdev);
1846 local->mdev = NULL;
1847 }
1848 EXPORT_SYMBOL(ieee80211_unregister_hw);
1849
1850 void ieee80211_free_hw(struct ieee80211_hw *hw)
1851 {
1852 struct ieee80211_local *local = hw_to_local(hw);
1853
1854 wiphy_free(local->hw.wiphy);
1855 }
1856 EXPORT_SYMBOL(ieee80211_free_hw);
1857
1858 static int __init ieee80211_init(void)
1859 {
1860 struct sk_buff *skb;
1861 int ret;
1862
1863 BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1864 BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1865 IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1866
1867 ret = rc80211_pid_init();
1868 if (ret)
1869 goto out;
1870
1871 ret = ieee80211_wme_register();
1872 if (ret) {
1873 printk(KERN_DEBUG "ieee80211_init: failed to "
1874 "initialize WME (err=%d)\n", ret);
1875 goto out_cleanup_pid;
1876 }
1877
1878 ieee80211_debugfs_netdev_init();
1879
1880 return 0;
1881
1882 out_cleanup_pid:
1883 rc80211_pid_exit();
1884 out:
1885 return ret;
1886 }
1887
1888 static void __exit ieee80211_exit(void)
1889 {
1890 rc80211_pid_exit();
1891
1892 /*
1893 * For key todo, it'll be empty by now but the work
1894 * might still be scheduled.
1895 */
1896 flush_scheduled_work();
1897
1898 if (mesh_allocated)
1899 ieee80211s_stop();
1900
1901 ieee80211_wme_unregister();
1902 ieee80211_debugfs_netdev_exit();
1903 }
1904
1905
1906 subsys_initcall(ieee80211_init);
1907 module_exit(ieee80211_exit);
1908
1909 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1910 MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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