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netdev: Make netif_schedule() routines work with netdev_queue objects.
[mirror_ubuntu-artful-kernel.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 return -EINVAL;
156 }
157
158 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
159 printk(KERN_DEBUG "%s: setting MTU %d\n", dev->name, new_mtu);
160 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
161 dev->mtu = new_mtu;
162 return 0;
163 }
164
165 static inline int identical_mac_addr_allowed(int type1, int type2)
166 {
167 return (type1 == IEEE80211_IF_TYPE_MNTR ||
168 type2 == IEEE80211_IF_TYPE_MNTR ||
169 (type1 == IEEE80211_IF_TYPE_AP &&
170 type2 == IEEE80211_IF_TYPE_WDS) ||
171 (type1 == IEEE80211_IF_TYPE_WDS &&
172 (type2 == IEEE80211_IF_TYPE_WDS ||
173 type2 == IEEE80211_IF_TYPE_AP)) ||
174 (type1 == IEEE80211_IF_TYPE_AP &&
175 type2 == IEEE80211_IF_TYPE_VLAN) ||
176 (type1 == IEEE80211_IF_TYPE_VLAN &&
177 (type2 == IEEE80211_IF_TYPE_AP ||
178 type2 == IEEE80211_IF_TYPE_VLAN)));
179 }
180
181 static int ieee80211_open(struct net_device *dev)
182 {
183 struct ieee80211_sub_if_data *sdata, *nsdata;
184 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
185 struct sta_info *sta;
186 struct ieee80211_if_init_conf conf;
187 u32 changed = 0;
188 int res;
189 bool need_hw_reconfig = 0;
190
191 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
192
193 /* we hold the RTNL here so can safely walk the list */
194 list_for_each_entry(nsdata, &local->interfaces, list) {
195 struct net_device *ndev = nsdata->dev;
196
197 if (ndev != dev && ndev != local->mdev && netif_running(ndev)) {
198 /*
199 * Allow only a single IBSS interface to be up at any
200 * time. This is restricted because beacon distribution
201 * cannot work properly if both are in the same IBSS.
202 *
203 * To remove this restriction we'd have to disallow them
204 * from setting the same SSID on different IBSS interfaces
205 * belonging to the same hardware. Then, however, we're
206 * faced with having to adopt two different TSF timers...
207 */
208 if (sdata->vif.type == IEEE80211_IF_TYPE_IBSS &&
209 nsdata->vif.type == IEEE80211_IF_TYPE_IBSS)
210 return -EBUSY;
211
212 /*
213 * Disallow multiple IBSS/STA mode interfaces.
214 *
215 * This is a technical restriction, it is possible although
216 * most likely not IEEE 802.11 compliant to have multiple
217 * STAs with just a single hardware (the TSF timer will not
218 * be adjusted properly.)
219 *
220 * However, because mac80211 uses the master device's BSS
221 * information for each STA/IBSS interface, doing this will
222 * currently corrupt that BSS information completely, unless,
223 * a not very useful case, both STAs are associated to the
224 * same BSS.
225 *
226 * To remove this restriction, the BSS information needs to
227 * be embedded in the STA/IBSS mode sdata instead of using
228 * the master device's BSS structure.
229 */
230 if ((sdata->vif.type == IEEE80211_IF_TYPE_STA ||
231 sdata->vif.type == IEEE80211_IF_TYPE_IBSS) &&
232 (nsdata->vif.type == IEEE80211_IF_TYPE_STA ||
233 nsdata->vif.type == IEEE80211_IF_TYPE_IBSS))
234 return -EBUSY;
235
236 /*
237 * The remaining checks are only performed for interfaces
238 * with the same MAC address.
239 */
240 if (compare_ether_addr(dev->dev_addr, ndev->dev_addr))
241 continue;
242
243 /*
244 * check whether it may have the same address
245 */
246 if (!identical_mac_addr_allowed(sdata->vif.type,
247 nsdata->vif.type))
248 return -ENOTUNIQ;
249
250 /*
251 * can only add VLANs to enabled APs
252 */
253 if (sdata->vif.type == IEEE80211_IF_TYPE_VLAN &&
254 nsdata->vif.type == IEEE80211_IF_TYPE_AP)
255 sdata->u.vlan.ap = nsdata;
256 }
257 }
258
259 switch (sdata->vif.type) {
260 case IEEE80211_IF_TYPE_WDS:
261 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
262 return -ENOLINK;
263 break;
264 case IEEE80211_IF_TYPE_VLAN:
265 if (!sdata->u.vlan.ap)
266 return -ENOLINK;
267 break;
268 case IEEE80211_IF_TYPE_AP:
269 case IEEE80211_IF_TYPE_STA:
270 case IEEE80211_IF_TYPE_MNTR:
271 case IEEE80211_IF_TYPE_IBSS:
272 case IEEE80211_IF_TYPE_MESH_POINT:
273 /* no special treatment */
274 break;
275 case IEEE80211_IF_TYPE_INVALID:
276 /* cannot happen */
277 WARN_ON(1);
278 break;
279 }
280
281 if (local->open_count == 0) {
282 res = 0;
283 if (local->ops->start)
284 res = local->ops->start(local_to_hw(local));
285 if (res)
286 return res;
287 need_hw_reconfig = 1;
288 ieee80211_led_radio(local, local->hw.conf.radio_enabled);
289 }
290
291 switch (sdata->vif.type) {
292 case IEEE80211_IF_TYPE_VLAN:
293 list_add(&sdata->u.vlan.list, &sdata->u.vlan.ap->u.ap.vlans);
294 /* no need to tell driver */
295 break;
296 case IEEE80211_IF_TYPE_MNTR:
297 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
298 local->cooked_mntrs++;
299 break;
300 }
301
302 /* must be before the call to ieee80211_configure_filter */
303 local->monitors++;
304 if (local->monitors == 1)
305 local->hw.conf.flags |= IEEE80211_CONF_RADIOTAP;
306
307 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
308 local->fif_fcsfail++;
309 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
310 local->fif_plcpfail++;
311 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL)
312 local->fif_control++;
313 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
314 local->fif_other_bss++;
315
316 netif_tx_lock_bh(local->mdev);
317 ieee80211_configure_filter(local);
318 netif_tx_unlock_bh(local->mdev);
319 break;
320 case IEEE80211_IF_TYPE_STA:
321 case IEEE80211_IF_TYPE_IBSS:
322 sdata->u.sta.flags &= ~IEEE80211_STA_PREV_BSSID_SET;
323 /* fall through */
324 default:
325 conf.vif = &sdata->vif;
326 conf.type = sdata->vif.type;
327 conf.mac_addr = dev->dev_addr;
328 res = local->ops->add_interface(local_to_hw(local), &conf);
329 if (res)
330 goto err_stop;
331
332 ieee80211_if_config(dev);
333 changed |= ieee80211_reset_erp_info(dev);
334 ieee80211_bss_info_change_notify(sdata, changed);
335 ieee80211_enable_keys(sdata);
336
337 if (sdata->vif.type == IEEE80211_IF_TYPE_STA &&
338 !(sdata->flags & IEEE80211_SDATA_USERSPACE_MLME))
339 netif_carrier_off(dev);
340 else
341 netif_carrier_on(dev);
342 }
343
344 if (sdata->vif.type == IEEE80211_IF_TYPE_WDS) {
345 /* Create STA entry for the WDS peer */
346 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
347 GFP_KERNEL);
348 if (!sta) {
349 res = -ENOMEM;
350 goto err_del_interface;
351 }
352
353 /* no locking required since STA is not live yet */
354 sta->flags |= WLAN_STA_AUTHORIZED;
355
356 res = sta_info_insert(sta);
357 if (res) {
358 /* STA has been freed */
359 goto err_del_interface;
360 }
361 }
362
363 if (local->open_count == 0) {
364 res = dev_open(local->mdev);
365 WARN_ON(res);
366 if (res)
367 goto err_del_interface;
368 tasklet_enable(&local->tx_pending_tasklet);
369 tasklet_enable(&local->tasklet);
370 }
371
372 /*
373 * set_multicast_list will be invoked by the networking core
374 * which will check whether any increments here were done in
375 * error and sync them down to the hardware as filter flags.
376 */
377 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
378 atomic_inc(&local->iff_allmultis);
379
380 if (sdata->flags & IEEE80211_SDATA_PROMISC)
381 atomic_inc(&local->iff_promiscs);
382
383 local->open_count++;
384 if (need_hw_reconfig)
385 ieee80211_hw_config(local);
386
387 /*
388 * ieee80211_sta_work is disabled while network interface
389 * is down. Therefore, some configuration changes may not
390 * yet be effective. Trigger execution of ieee80211_sta_work
391 * to fix this.
392 */
393 if (sdata->vif.type == IEEE80211_IF_TYPE_STA ||
394 sdata->vif.type == IEEE80211_IF_TYPE_IBSS) {
395 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
396 queue_work(local->hw.workqueue, &ifsta->work);
397 }
398
399 netif_start_queue(dev);
400
401 return 0;
402 err_del_interface:
403 local->ops->remove_interface(local_to_hw(local), &conf);
404 err_stop:
405 if (!local->open_count && local->ops->stop)
406 local->ops->stop(local_to_hw(local));
407 return res;
408 }
409
410 static int ieee80211_stop(struct net_device *dev)
411 {
412 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
413 struct ieee80211_local *local = sdata->local;
414 struct ieee80211_if_init_conf conf;
415 struct sta_info *sta;
416
417 /*
418 * Stop TX on this interface first.
419 */
420 netif_stop_queue(dev);
421
422 /*
423 * Now delete all active aggregation sessions.
424 */
425 rcu_read_lock();
426
427 list_for_each_entry_rcu(sta, &local->sta_list, list) {
428 if (sta->sdata == sdata)
429 ieee80211_sta_tear_down_BA_sessions(dev, sta->addr);
430 }
431
432 rcu_read_unlock();
433
434 /*
435 * Remove all stations associated with this interface.
436 *
437 * This must be done before calling ops->remove_interface()
438 * because otherwise we can later invoke ops->sta_notify()
439 * whenever the STAs are removed, and that invalidates driver
440 * assumptions about always getting a vif pointer that is valid
441 * (because if we remove a STA after ops->remove_interface()
442 * the driver will have removed the vif info already!)
443 *
444 * We could relax this and only unlink the stations from the
445 * hash table and list but keep them on a per-sdata list that
446 * will be inserted back again when the interface is brought
447 * up again, but I don't currently see a use case for that,
448 * except with WDS which gets a STA entry created when it is
449 * brought up.
450 */
451 sta_info_flush(local, sdata);
452
453 /*
454 * Don't count this interface for promisc/allmulti while it
455 * is down. dev_mc_unsync() will invoke set_multicast_list
456 * on the master interface which will sync these down to the
457 * hardware as filter flags.
458 */
459 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
460 atomic_dec(&local->iff_allmultis);
461
462 if (sdata->flags & IEEE80211_SDATA_PROMISC)
463 atomic_dec(&local->iff_promiscs);
464
465 dev_mc_unsync(local->mdev, dev);
466
467 /* APs need special treatment */
468 if (sdata->vif.type == IEEE80211_IF_TYPE_AP) {
469 struct ieee80211_sub_if_data *vlan, *tmp;
470 struct beacon_data *old_beacon = sdata->u.ap.beacon;
471
472 /* remove beacon */
473 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
474 synchronize_rcu();
475 kfree(old_beacon);
476
477 /* down all dependent devices, that is VLANs */
478 list_for_each_entry_safe(vlan, tmp, &sdata->u.ap.vlans,
479 u.vlan.list)
480 dev_close(vlan->dev);
481 WARN_ON(!list_empty(&sdata->u.ap.vlans));
482 }
483
484 local->open_count--;
485
486 switch (sdata->vif.type) {
487 case IEEE80211_IF_TYPE_VLAN:
488 list_del(&sdata->u.vlan.list);
489 sdata->u.vlan.ap = NULL;
490 /* no need to tell driver */
491 break;
492 case IEEE80211_IF_TYPE_MNTR:
493 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
494 local->cooked_mntrs--;
495 break;
496 }
497
498 local->monitors--;
499 if (local->monitors == 0)
500 local->hw.conf.flags &= ~IEEE80211_CONF_RADIOTAP;
501
502 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
503 local->fif_fcsfail--;
504 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
505 local->fif_plcpfail--;
506 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL)
507 local->fif_control--;
508 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
509 local->fif_other_bss--;
510
511 netif_tx_lock_bh(local->mdev);
512 ieee80211_configure_filter(local);
513 netif_tx_unlock_bh(local->mdev);
514 break;
515 case IEEE80211_IF_TYPE_MESH_POINT:
516 case IEEE80211_IF_TYPE_STA:
517 case IEEE80211_IF_TYPE_IBSS:
518 sdata->u.sta.state = IEEE80211_DISABLED;
519 memset(sdata->u.sta.bssid, 0, ETH_ALEN);
520 del_timer_sync(&sdata->u.sta.timer);
521 /*
522 * When we get here, the interface is marked down.
523 * Call synchronize_rcu() to wait for the RX path
524 * should it be using the interface and enqueuing
525 * frames at this very time on another CPU.
526 */
527 synchronize_rcu();
528 skb_queue_purge(&sdata->u.sta.skb_queue);
529
530 if (local->scan_dev == sdata->dev) {
531 if (!local->ops->hw_scan) {
532 local->sta_sw_scanning = 0;
533 cancel_delayed_work(&local->scan_work);
534 } else
535 local->sta_hw_scanning = 0;
536 }
537
538 sdata->u.sta.flags &= ~IEEE80211_STA_PRIVACY_INVOKED;
539 kfree(sdata->u.sta.extra_ie);
540 sdata->u.sta.extra_ie = NULL;
541 sdata->u.sta.extra_ie_len = 0;
542 /* fall through */
543 default:
544 conf.vif = &sdata->vif;
545 conf.type = sdata->vif.type;
546 conf.mac_addr = dev->dev_addr;
547 /* disable all keys for as long as this netdev is down */
548 ieee80211_disable_keys(sdata);
549 local->ops->remove_interface(local_to_hw(local), &conf);
550 }
551
552 if (local->open_count == 0) {
553 if (netif_running(local->mdev))
554 dev_close(local->mdev);
555
556 if (local->ops->stop)
557 local->ops->stop(local_to_hw(local));
558
559 ieee80211_led_radio(local, 0);
560
561 flush_workqueue(local->hw.workqueue);
562
563 tasklet_disable(&local->tx_pending_tasklet);
564 tasklet_disable(&local->tasklet);
565 }
566
567 return 0;
568 }
569
570 int ieee80211_start_tx_ba_session(struct ieee80211_hw *hw, u8 *ra, u16 tid)
571 {
572 struct ieee80211_local *local = hw_to_local(hw);
573 struct netdev_queue *txq;
574 struct sta_info *sta;
575 struct ieee80211_sub_if_data *sdata;
576 u16 start_seq_num = 0;
577 u8 *state;
578 int ret;
579 DECLARE_MAC_BUF(mac);
580
581 if (tid >= STA_TID_NUM)
582 return -EINVAL;
583
584 #ifdef CONFIG_MAC80211_HT_DEBUG
585 printk(KERN_DEBUG "Open BA session requested for %s tid %u\n",
586 print_mac(mac, ra), tid);
587 #endif /* CONFIG_MAC80211_HT_DEBUG */
588
589 rcu_read_lock();
590
591 sta = sta_info_get(local, ra);
592 if (!sta) {
593 #ifdef CONFIG_MAC80211_HT_DEBUG
594 printk(KERN_DEBUG "Could not find the station\n");
595 #endif
596 ret = -ENOENT;
597 goto exit;
598 }
599
600 spin_lock_bh(&sta->lock);
601
602 /* we have tried too many times, receiver does not want A-MPDU */
603 if (sta->ampdu_mlme.addba_req_num[tid] > HT_AGG_MAX_RETRIES) {
604 ret = -EBUSY;
605 goto err_unlock_sta;
606 }
607
608 state = &sta->ampdu_mlme.tid_state_tx[tid];
609 /* check if the TID is not in aggregation flow already */
610 if (*state != HT_AGG_STATE_IDLE) {
611 #ifdef CONFIG_MAC80211_HT_DEBUG
612 printk(KERN_DEBUG "BA request denied - session is not "
613 "idle on tid %u\n", tid);
614 #endif /* CONFIG_MAC80211_HT_DEBUG */
615 ret = -EAGAIN;
616 goto err_unlock_sta;
617 }
618
619 /* prepare A-MPDU MLME for Tx aggregation */
620 sta->ampdu_mlme.tid_tx[tid] =
621 kmalloc(sizeof(struct tid_ampdu_tx), GFP_ATOMIC);
622 if (!sta->ampdu_mlme.tid_tx[tid]) {
623 #ifdef CONFIG_MAC80211_HT_DEBUG
624 if (net_ratelimit())
625 printk(KERN_ERR "allocate tx mlme to tid %d failed\n",
626 tid);
627 #endif
628 ret = -ENOMEM;
629 goto err_unlock_sta;
630 }
631 /* Tx timer */
632 sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.function =
633 sta_addba_resp_timer_expired;
634 sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.data =
635 (unsigned long)&sta->timer_to_tid[tid];
636 init_timer(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer);
637
638 /* ensure that TX flow won't interrupt us
639 * until the end of the call to requeue function */
640 txq = &local->mdev->tx_queue;
641 spin_lock_bh(&txq->lock);
642
643 /* create a new queue for this aggregation */
644 ret = ieee80211_ht_agg_queue_add(local, sta, tid);
645
646 /* case no queue is available to aggregation
647 * don't switch to aggregation */
648 if (ret) {
649 #ifdef CONFIG_MAC80211_HT_DEBUG
650 printk(KERN_DEBUG "BA request denied - queue unavailable for"
651 " tid %d\n", tid);
652 #endif /* CONFIG_MAC80211_HT_DEBUG */
653 goto err_unlock_queue;
654 }
655 sdata = sta->sdata;
656
657 /* Ok, the Addba frame hasn't been sent yet, but if the driver calls the
658 * call back right away, it must see that the flow has begun */
659 *state |= HT_ADDBA_REQUESTED_MSK;
660
661 if (local->ops->ampdu_action)
662 ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_TX_START,
663 ra, tid, &start_seq_num);
664
665 if (ret) {
666 /* No need to requeue the packets in the agg queue, since we
667 * held the tx lock: no packet could be enqueued to the newly
668 * allocated queue */
669 ieee80211_ht_agg_queue_remove(local, sta, tid, 0);
670 #ifdef CONFIG_MAC80211_HT_DEBUG
671 printk(KERN_DEBUG "BA request denied - HW unavailable for"
672 " tid %d\n", tid);
673 #endif /* CONFIG_MAC80211_HT_DEBUG */
674 *state = HT_AGG_STATE_IDLE;
675 goto err_unlock_queue;
676 }
677
678 /* Will put all the packets in the new SW queue */
679 ieee80211_requeue(local, ieee802_1d_to_ac[tid]);
680 spin_unlock_bh(&txq->lock);
681 spin_unlock_bh(&sta->lock);
682
683 /* send an addBA request */
684 sta->ampdu_mlme.dialog_token_allocator++;
685 sta->ampdu_mlme.tid_tx[tid]->dialog_token =
686 sta->ampdu_mlme.dialog_token_allocator;
687 sta->ampdu_mlme.tid_tx[tid]->ssn = start_seq_num;
688
689
690 ieee80211_send_addba_request(sta->sdata->dev, ra, tid,
691 sta->ampdu_mlme.tid_tx[tid]->dialog_token,
692 sta->ampdu_mlme.tid_tx[tid]->ssn,
693 0x40, 5000);
694 /* activate the timer for the recipient's addBA response */
695 sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.expires =
696 jiffies + ADDBA_RESP_INTERVAL;
697 add_timer(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer);
698 #ifdef CONFIG_MAC80211_HT_DEBUG
699 printk(KERN_DEBUG "activated addBA response timer on tid %d\n", tid);
700 #endif
701 goto exit;
702
703 err_unlock_queue:
704 kfree(sta->ampdu_mlme.tid_tx[tid]);
705 sta->ampdu_mlme.tid_tx[tid] = NULL;
706 spin_unlock_bh(&txq->lock);
707 ret = -EBUSY;
708 err_unlock_sta:
709 spin_unlock_bh(&sta->lock);
710 exit:
711 rcu_read_unlock();
712 return ret;
713 }
714 EXPORT_SYMBOL(ieee80211_start_tx_ba_session);
715
716 int ieee80211_stop_tx_ba_session(struct ieee80211_hw *hw,
717 u8 *ra, u16 tid,
718 enum ieee80211_back_parties initiator)
719 {
720 struct ieee80211_local *local = hw_to_local(hw);
721 struct sta_info *sta;
722 u8 *state;
723 int ret = 0;
724 DECLARE_MAC_BUF(mac);
725
726 if (tid >= STA_TID_NUM)
727 return -EINVAL;
728
729 rcu_read_lock();
730 sta = sta_info_get(local, ra);
731 if (!sta) {
732 rcu_read_unlock();
733 return -ENOENT;
734 }
735
736 /* check if the TID is in aggregation */
737 state = &sta->ampdu_mlme.tid_state_tx[tid];
738 spin_lock_bh(&sta->lock);
739
740 if (*state != HT_AGG_STATE_OPERATIONAL) {
741 ret = -ENOENT;
742 goto stop_BA_exit;
743 }
744
745 #ifdef CONFIG_MAC80211_HT_DEBUG
746 printk(KERN_DEBUG "Tx BA session stop requested for %s tid %u\n",
747 print_mac(mac, ra), tid);
748 #endif /* CONFIG_MAC80211_HT_DEBUG */
749
750 ieee80211_stop_queue(hw, sta->tid_to_tx_q[tid]);
751
752 *state = HT_AGG_STATE_REQ_STOP_BA_MSK |
753 (initiator << HT_AGG_STATE_INITIATOR_SHIFT);
754
755 if (local->ops->ampdu_action)
756 ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_TX_STOP,
757 ra, tid, NULL);
758
759 /* case HW denied going back to legacy */
760 if (ret) {
761 WARN_ON(ret != -EBUSY);
762 *state = HT_AGG_STATE_OPERATIONAL;
763 ieee80211_wake_queue(hw, sta->tid_to_tx_q[tid]);
764 goto stop_BA_exit;
765 }
766
767 stop_BA_exit:
768 spin_unlock_bh(&sta->lock);
769 rcu_read_unlock();
770 return ret;
771 }
772 EXPORT_SYMBOL(ieee80211_stop_tx_ba_session);
773
774 void ieee80211_start_tx_ba_cb(struct ieee80211_hw *hw, u8 *ra, u16 tid)
775 {
776 struct ieee80211_local *local = hw_to_local(hw);
777 struct sta_info *sta;
778 u8 *state;
779 DECLARE_MAC_BUF(mac);
780
781 if (tid >= STA_TID_NUM) {
782 #ifdef CONFIG_MAC80211_HT_DEBUG
783 printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n",
784 tid, STA_TID_NUM);
785 #endif
786 return;
787 }
788
789 rcu_read_lock();
790 sta = sta_info_get(local, ra);
791 if (!sta) {
792 rcu_read_unlock();
793 #ifdef CONFIG_MAC80211_HT_DEBUG
794 printk(KERN_DEBUG "Could not find station: %s\n",
795 print_mac(mac, ra));
796 #endif
797 return;
798 }
799
800 state = &sta->ampdu_mlme.tid_state_tx[tid];
801 spin_lock_bh(&sta->lock);
802
803 if (!(*state & HT_ADDBA_REQUESTED_MSK)) {
804 #ifdef CONFIG_MAC80211_HT_DEBUG
805 printk(KERN_DEBUG "addBA was not requested yet, state is %d\n",
806 *state);
807 #endif
808 spin_unlock_bh(&sta->lock);
809 rcu_read_unlock();
810 return;
811 }
812
813 WARN_ON_ONCE(*state & HT_ADDBA_DRV_READY_MSK);
814
815 *state |= HT_ADDBA_DRV_READY_MSK;
816
817 if (*state == HT_AGG_STATE_OPERATIONAL) {
818 #ifdef CONFIG_MAC80211_HT_DEBUG
819 printk(KERN_DEBUG "Aggregation is on for tid %d \n", tid);
820 #endif
821 ieee80211_wake_queue(hw, sta->tid_to_tx_q[tid]);
822 }
823 spin_unlock_bh(&sta->lock);
824 rcu_read_unlock();
825 }
826 EXPORT_SYMBOL(ieee80211_start_tx_ba_cb);
827
828 void ieee80211_stop_tx_ba_cb(struct ieee80211_hw *hw, u8 *ra, u8 tid)
829 {
830 struct ieee80211_local *local = hw_to_local(hw);
831 struct netdev_queue *txq;
832 struct sta_info *sta;
833 u8 *state;
834 int agg_queue;
835 DECLARE_MAC_BUF(mac);
836
837 if (tid >= STA_TID_NUM) {
838 #ifdef CONFIG_MAC80211_HT_DEBUG
839 printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n",
840 tid, STA_TID_NUM);
841 #endif
842 return;
843 }
844
845 #ifdef CONFIG_MAC80211_HT_DEBUG
846 printk(KERN_DEBUG "Stopping Tx BA session for %s tid %d\n",
847 print_mac(mac, ra), tid);
848 #endif /* CONFIG_MAC80211_HT_DEBUG */
849
850 rcu_read_lock();
851 sta = sta_info_get(local, ra);
852 if (!sta) {
853 #ifdef CONFIG_MAC80211_HT_DEBUG
854 printk(KERN_DEBUG "Could not find station: %s\n",
855 print_mac(mac, ra));
856 #endif
857 rcu_read_unlock();
858 return;
859 }
860 state = &sta->ampdu_mlme.tid_state_tx[tid];
861
862 /* NOTE: no need to use sta->lock in this state check, as
863 * ieee80211_stop_tx_ba_session will let only
864 * one stop call to pass through per sta/tid */
865 if ((*state & HT_AGG_STATE_REQ_STOP_BA_MSK) == 0) {
866 #ifdef CONFIG_MAC80211_HT_DEBUG
867 printk(KERN_DEBUG "unexpected callback to A-MPDU stop\n");
868 #endif
869 rcu_read_unlock();
870 return;
871 }
872
873 if (*state & HT_AGG_STATE_INITIATOR_MSK)
874 ieee80211_send_delba(sta->sdata->dev, ra, tid,
875 WLAN_BACK_INITIATOR, WLAN_REASON_QSTA_NOT_USE);
876
877 agg_queue = sta->tid_to_tx_q[tid];
878
879 /* avoid ordering issues: we are the only one that can modify
880 * the content of the qdiscs */
881 txq = &local->mdev->tx_queue;
882 spin_lock_bh(&txq->lock);
883 /* remove the queue for this aggregation */
884 ieee80211_ht_agg_queue_remove(local, sta, tid, 1);
885 spin_unlock_bh(&txq->lock);
886
887 /* we just requeued the all the frames that were in the removed
888 * queue, and since we might miss a softirq we do netif_schedule_queue.
889 * ieee80211_wake_queue is not used here as this queue is not
890 * necessarily stopped */
891 netif_schedule_queue(txq);
892 spin_lock_bh(&sta->lock);
893 *state = HT_AGG_STATE_IDLE;
894 sta->ampdu_mlme.addba_req_num[tid] = 0;
895 kfree(sta->ampdu_mlme.tid_tx[tid]);
896 sta->ampdu_mlme.tid_tx[tid] = NULL;
897 spin_unlock_bh(&sta->lock);
898
899 rcu_read_unlock();
900 }
901 EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb);
902
903 void ieee80211_start_tx_ba_cb_irqsafe(struct ieee80211_hw *hw,
904 const u8 *ra, u16 tid)
905 {
906 struct ieee80211_local *local = hw_to_local(hw);
907 struct ieee80211_ra_tid *ra_tid;
908 struct sk_buff *skb = dev_alloc_skb(0);
909
910 if (unlikely(!skb)) {
911 #ifdef CONFIG_MAC80211_HT_DEBUG
912 if (net_ratelimit())
913 printk(KERN_WARNING "%s: Not enough memory, "
914 "dropping start BA session", skb->dev->name);
915 #endif
916 return;
917 }
918 ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
919 memcpy(&ra_tid->ra, ra, ETH_ALEN);
920 ra_tid->tid = tid;
921
922 skb->pkt_type = IEEE80211_ADDBA_MSG;
923 skb_queue_tail(&local->skb_queue, skb);
924 tasklet_schedule(&local->tasklet);
925 }
926 EXPORT_SYMBOL(ieee80211_start_tx_ba_cb_irqsafe);
927
928 void ieee80211_stop_tx_ba_cb_irqsafe(struct ieee80211_hw *hw,
929 const u8 *ra, u16 tid)
930 {
931 struct ieee80211_local *local = hw_to_local(hw);
932 struct ieee80211_ra_tid *ra_tid;
933 struct sk_buff *skb = dev_alloc_skb(0);
934
935 if (unlikely(!skb)) {
936 #ifdef CONFIG_MAC80211_HT_DEBUG
937 if (net_ratelimit())
938 printk(KERN_WARNING "%s: Not enough memory, "
939 "dropping stop BA session", skb->dev->name);
940 #endif
941 return;
942 }
943 ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
944 memcpy(&ra_tid->ra, ra, ETH_ALEN);
945 ra_tid->tid = tid;
946
947 skb->pkt_type = IEEE80211_DELBA_MSG;
948 skb_queue_tail(&local->skb_queue, skb);
949 tasklet_schedule(&local->tasklet);
950 }
951 EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb_irqsafe);
952
953 static void ieee80211_set_multicast_list(struct net_device *dev)
954 {
955 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
956 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
957 int allmulti, promisc, sdata_allmulti, sdata_promisc;
958
959 allmulti = !!(dev->flags & IFF_ALLMULTI);
960 promisc = !!(dev->flags & IFF_PROMISC);
961 sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
962 sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
963
964 if (allmulti != sdata_allmulti) {
965 if (dev->flags & IFF_ALLMULTI)
966 atomic_inc(&local->iff_allmultis);
967 else
968 atomic_dec(&local->iff_allmultis);
969 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
970 }
971
972 if (promisc != sdata_promisc) {
973 if (dev->flags & IFF_PROMISC)
974 atomic_inc(&local->iff_promiscs);
975 else
976 atomic_dec(&local->iff_promiscs);
977 sdata->flags ^= IEEE80211_SDATA_PROMISC;
978 }
979
980 dev_mc_sync(local->mdev, dev);
981 }
982
983 static const struct header_ops ieee80211_header_ops = {
984 .create = eth_header,
985 .parse = header_parse_80211,
986 .rebuild = eth_rebuild_header,
987 .cache = eth_header_cache,
988 .cache_update = eth_header_cache_update,
989 };
990
991 /* Must not be called for mdev */
992 void ieee80211_if_setup(struct net_device *dev)
993 {
994 ether_setup(dev);
995 dev->hard_start_xmit = ieee80211_subif_start_xmit;
996 dev->wireless_handlers = &ieee80211_iw_handler_def;
997 dev->set_multicast_list = ieee80211_set_multicast_list;
998 dev->change_mtu = ieee80211_change_mtu;
999 dev->open = ieee80211_open;
1000 dev->stop = ieee80211_stop;
1001 dev->destructor = ieee80211_if_free;
1002 }
1003
1004 /* everything else */
1005
1006 static int __ieee80211_if_config(struct net_device *dev,
1007 struct sk_buff *beacon)
1008 {
1009 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1010 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1011 struct ieee80211_if_conf conf;
1012
1013 if (!local->ops->config_interface || !netif_running(dev))
1014 return 0;
1015
1016 memset(&conf, 0, sizeof(conf));
1017 conf.type = sdata->vif.type;
1018 if (sdata->vif.type == IEEE80211_IF_TYPE_STA ||
1019 sdata->vif.type == IEEE80211_IF_TYPE_IBSS) {
1020 conf.bssid = sdata->u.sta.bssid;
1021 conf.ssid = sdata->u.sta.ssid;
1022 conf.ssid_len = sdata->u.sta.ssid_len;
1023 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
1024 conf.beacon = beacon;
1025 ieee80211_start_mesh(dev);
1026 } else if (sdata->vif.type == IEEE80211_IF_TYPE_AP) {
1027 conf.ssid = sdata->u.ap.ssid;
1028 conf.ssid_len = sdata->u.ap.ssid_len;
1029 conf.beacon = beacon;
1030 }
1031 return local->ops->config_interface(local_to_hw(local),
1032 &sdata->vif, &conf);
1033 }
1034
1035 int ieee80211_if_config(struct net_device *dev)
1036 {
1037 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1038 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1039 if (sdata->vif.type == IEEE80211_IF_TYPE_MESH_POINT &&
1040 (local->hw.flags & IEEE80211_HW_HOST_GEN_BEACON_TEMPLATE))
1041 return ieee80211_if_config_beacon(dev);
1042 return __ieee80211_if_config(dev, NULL);
1043 }
1044
1045 int ieee80211_if_config_beacon(struct net_device *dev)
1046 {
1047 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1048 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1049 struct sk_buff *skb;
1050
1051 if (!(local->hw.flags & IEEE80211_HW_HOST_GEN_BEACON_TEMPLATE))
1052 return 0;
1053 skb = ieee80211_beacon_get(local_to_hw(local), &sdata->vif);
1054 if (!skb)
1055 return -ENOMEM;
1056 return __ieee80211_if_config(dev, skb);
1057 }
1058
1059 int ieee80211_hw_config(struct ieee80211_local *local)
1060 {
1061 struct ieee80211_channel *chan;
1062 int ret = 0;
1063
1064 if (local->sta_sw_scanning)
1065 chan = local->scan_channel;
1066 else
1067 chan = local->oper_channel;
1068
1069 local->hw.conf.channel = chan;
1070
1071 if (!local->hw.conf.power_level)
1072 local->hw.conf.power_level = chan->max_power;
1073 else
1074 local->hw.conf.power_level = min(chan->max_power,
1075 local->hw.conf.power_level);
1076
1077 local->hw.conf.max_antenna_gain = chan->max_antenna_gain;
1078
1079 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1080 printk(KERN_DEBUG "%s: HW CONFIG: freq=%d\n",
1081 wiphy_name(local->hw.wiphy), chan->center_freq);
1082 #endif
1083
1084 if (local->open_count)
1085 ret = local->ops->config(local_to_hw(local), &local->hw.conf);
1086
1087 return ret;
1088 }
1089
1090 /**
1091 * ieee80211_handle_ht should be used only after legacy configuration
1092 * has been determined namely band, as ht configuration depends upon
1093 * the hardware's HT abilities for a _specific_ band.
1094 */
1095 u32 ieee80211_handle_ht(struct ieee80211_local *local, int enable_ht,
1096 struct ieee80211_ht_info *req_ht_cap,
1097 struct ieee80211_ht_bss_info *req_bss_cap)
1098 {
1099 struct ieee80211_conf *conf = &local->hw.conf;
1100 struct ieee80211_supported_band *sband;
1101 struct ieee80211_ht_info ht_conf;
1102 struct ieee80211_ht_bss_info ht_bss_conf;
1103 u32 changed = 0;
1104 int i;
1105 u8 max_tx_streams = IEEE80211_HT_CAP_MAX_STREAMS;
1106 u8 tx_mcs_set_cap;
1107
1108 sband = local->hw.wiphy->bands[conf->channel->band];
1109
1110 memset(&ht_conf, 0, sizeof(struct ieee80211_ht_info));
1111 memset(&ht_bss_conf, 0, sizeof(struct ieee80211_ht_bss_info));
1112
1113 /* HT is not supported */
1114 if (!sband->ht_info.ht_supported) {
1115 conf->flags &= ~IEEE80211_CONF_SUPPORT_HT_MODE;
1116 goto out;
1117 }
1118
1119 /* disable HT */
1120 if (!enable_ht) {
1121 if (conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE)
1122 changed |= BSS_CHANGED_HT;
1123 conf->flags &= ~IEEE80211_CONF_SUPPORT_HT_MODE;
1124 conf->ht_conf.ht_supported = 0;
1125 goto out;
1126 }
1127
1128
1129 if (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE))
1130 changed |= BSS_CHANGED_HT;
1131
1132 conf->flags |= IEEE80211_CONF_SUPPORT_HT_MODE;
1133 ht_conf.ht_supported = 1;
1134
1135 ht_conf.cap = req_ht_cap->cap & sband->ht_info.cap;
1136 ht_conf.cap &= ~(IEEE80211_HT_CAP_MIMO_PS);
1137 ht_conf.cap |= sband->ht_info.cap & IEEE80211_HT_CAP_MIMO_PS;
1138 ht_bss_conf.primary_channel = req_bss_cap->primary_channel;
1139 ht_bss_conf.bss_cap = req_bss_cap->bss_cap;
1140 ht_bss_conf.bss_op_mode = req_bss_cap->bss_op_mode;
1141
1142 ht_conf.ampdu_factor = req_ht_cap->ampdu_factor;
1143 ht_conf.ampdu_density = req_ht_cap->ampdu_density;
1144
1145 /* Bits 96-100 */
1146 tx_mcs_set_cap = sband->ht_info.supp_mcs_set[12];
1147
1148 /* configure suppoerted Tx MCS according to requested MCS
1149 * (based in most cases on Rx capabilities of peer) and self
1150 * Tx MCS capabilities (as defined by low level driver HW
1151 * Tx capabilities) */
1152 if (!(tx_mcs_set_cap & IEEE80211_HT_CAP_MCS_TX_DEFINED))
1153 goto check_changed;
1154
1155 /* Counting from 0 therfore + 1 */
1156 if (tx_mcs_set_cap & IEEE80211_HT_CAP_MCS_TX_RX_DIFF)
1157 max_tx_streams = ((tx_mcs_set_cap &
1158 IEEE80211_HT_CAP_MCS_TX_STREAMS) >> 2) + 1;
1159
1160 for (i = 0; i < max_tx_streams; i++)
1161 ht_conf.supp_mcs_set[i] =
1162 sband->ht_info.supp_mcs_set[i] &
1163 req_ht_cap->supp_mcs_set[i];
1164
1165 if (tx_mcs_set_cap & IEEE80211_HT_CAP_MCS_TX_UEQM)
1166 for (i = IEEE80211_SUPP_MCS_SET_UEQM;
1167 i < IEEE80211_SUPP_MCS_SET_LEN; i++)
1168 ht_conf.supp_mcs_set[i] =
1169 sband->ht_info.supp_mcs_set[i] &
1170 req_ht_cap->supp_mcs_set[i];
1171
1172 check_changed:
1173 /* if bss configuration changed store the new one */
1174 if (memcmp(&conf->ht_conf, &ht_conf, sizeof(ht_conf)) ||
1175 memcmp(&conf->ht_bss_conf, &ht_bss_conf, sizeof(ht_bss_conf))) {
1176 changed |= BSS_CHANGED_HT;
1177 memcpy(&conf->ht_conf, &ht_conf, sizeof(ht_conf));
1178 memcpy(&conf->ht_bss_conf, &ht_bss_conf, sizeof(ht_bss_conf));
1179 }
1180 out:
1181 return changed;
1182 }
1183
1184 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
1185 u32 changed)
1186 {
1187 struct ieee80211_local *local = sdata->local;
1188
1189 if (!changed)
1190 return;
1191
1192 if (local->ops->bss_info_changed)
1193 local->ops->bss_info_changed(local_to_hw(local),
1194 &sdata->vif,
1195 &sdata->bss_conf,
1196 changed);
1197 }
1198
1199 u32 ieee80211_reset_erp_info(struct net_device *dev)
1200 {
1201 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1202
1203 sdata->bss_conf.use_cts_prot = 0;
1204 sdata->bss_conf.use_short_preamble = 0;
1205 return BSS_CHANGED_ERP_CTS_PROT | BSS_CHANGED_ERP_PREAMBLE;
1206 }
1207
1208 void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
1209 struct sk_buff *skb)
1210 {
1211 struct ieee80211_local *local = hw_to_local(hw);
1212 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1213 int tmp;
1214
1215 skb->dev = local->mdev;
1216 skb->pkt_type = IEEE80211_TX_STATUS_MSG;
1217 skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ?
1218 &local->skb_queue : &local->skb_queue_unreliable, skb);
1219 tmp = skb_queue_len(&local->skb_queue) +
1220 skb_queue_len(&local->skb_queue_unreliable);
1221 while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
1222 (skb = skb_dequeue(&local->skb_queue_unreliable))) {
1223 dev_kfree_skb_irq(skb);
1224 tmp--;
1225 I802_DEBUG_INC(local->tx_status_drop);
1226 }
1227 tasklet_schedule(&local->tasklet);
1228 }
1229 EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
1230
1231 static void ieee80211_tasklet_handler(unsigned long data)
1232 {
1233 struct ieee80211_local *local = (struct ieee80211_local *) data;
1234 struct sk_buff *skb;
1235 struct ieee80211_rx_status rx_status;
1236 struct ieee80211_ra_tid *ra_tid;
1237
1238 while ((skb = skb_dequeue(&local->skb_queue)) ||
1239 (skb = skb_dequeue(&local->skb_queue_unreliable))) {
1240 switch (skb->pkt_type) {
1241 case IEEE80211_RX_MSG:
1242 /* status is in skb->cb */
1243 memcpy(&rx_status, skb->cb, sizeof(rx_status));
1244 /* Clear skb->pkt_type in order to not confuse kernel
1245 * netstack. */
1246 skb->pkt_type = 0;
1247 __ieee80211_rx(local_to_hw(local), skb, &rx_status);
1248 break;
1249 case IEEE80211_TX_STATUS_MSG:
1250 skb->pkt_type = 0;
1251 ieee80211_tx_status(local_to_hw(local), skb);
1252 break;
1253 case IEEE80211_DELBA_MSG:
1254 ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
1255 ieee80211_stop_tx_ba_cb(local_to_hw(local),
1256 ra_tid->ra, ra_tid->tid);
1257 dev_kfree_skb(skb);
1258 break;
1259 case IEEE80211_ADDBA_MSG:
1260 ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
1261 ieee80211_start_tx_ba_cb(local_to_hw(local),
1262 ra_tid->ra, ra_tid->tid);
1263 dev_kfree_skb(skb);
1264 break ;
1265 default:
1266 WARN_ON(1);
1267 dev_kfree_skb(skb);
1268 break;
1269 }
1270 }
1271 }
1272
1273 /* Remove added headers (e.g., QoS control), encryption header/MIC, etc. to
1274 * make a prepared TX frame (one that has been given to hw) to look like brand
1275 * new IEEE 802.11 frame that is ready to go through TX processing again.
1276 * Also, tx_packet_data in cb is restored from tx_control. */
1277 static void ieee80211_remove_tx_extra(struct ieee80211_local *local,
1278 struct ieee80211_key *key,
1279 struct sk_buff *skb)
1280 {
1281 int hdrlen, iv_len, mic_len;
1282 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1283
1284 info->flags &= IEEE80211_TX_CTL_REQ_TX_STATUS |
1285 IEEE80211_TX_CTL_DO_NOT_ENCRYPT |
1286 IEEE80211_TX_CTL_REQUEUE |
1287 IEEE80211_TX_CTL_EAPOL_FRAME;
1288
1289 hdrlen = ieee80211_get_hdrlen_from_skb(skb);
1290
1291 if (!key)
1292 goto no_key;
1293
1294 switch (key->conf.alg) {
1295 case ALG_WEP:
1296 iv_len = WEP_IV_LEN;
1297 mic_len = WEP_ICV_LEN;
1298 break;
1299 case ALG_TKIP:
1300 iv_len = TKIP_IV_LEN;
1301 mic_len = TKIP_ICV_LEN;
1302 break;
1303 case ALG_CCMP:
1304 iv_len = CCMP_HDR_LEN;
1305 mic_len = CCMP_MIC_LEN;
1306 break;
1307 default:
1308 goto no_key;
1309 }
1310
1311 if (skb->len >= mic_len &&
1312 !(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
1313 skb_trim(skb, skb->len - mic_len);
1314 if (skb->len >= iv_len && skb->len > hdrlen) {
1315 memmove(skb->data + iv_len, skb->data, hdrlen);
1316 skb_pull(skb, iv_len);
1317 }
1318
1319 no_key:
1320 {
1321 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1322 u16 fc = le16_to_cpu(hdr->frame_control);
1323 if ((fc & 0x8C) == 0x88) /* QoS Control Field */ {
1324 fc &= ~IEEE80211_STYPE_QOS_DATA;
1325 hdr->frame_control = cpu_to_le16(fc);
1326 memmove(skb->data + 2, skb->data, hdrlen - 2);
1327 skb_pull(skb, 2);
1328 }
1329 }
1330 }
1331
1332 static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
1333 struct sta_info *sta,
1334 struct sk_buff *skb)
1335 {
1336 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1337
1338 sta->tx_filtered_count++;
1339
1340 /*
1341 * Clear the TX filter mask for this STA when sending the next
1342 * packet. If the STA went to power save mode, this will happen
1343 * when it wakes up for the next time.
1344 */
1345 set_sta_flags(sta, WLAN_STA_CLEAR_PS_FILT);
1346
1347 /*
1348 * This code races in the following way:
1349 *
1350 * (1) STA sends frame indicating it will go to sleep and does so
1351 * (2) hardware/firmware adds STA to filter list, passes frame up
1352 * (3) hardware/firmware processes TX fifo and suppresses a frame
1353 * (4) we get TX status before having processed the frame and
1354 * knowing that the STA has gone to sleep.
1355 *
1356 * This is actually quite unlikely even when both those events are
1357 * processed from interrupts coming in quickly after one another or
1358 * even at the same time because we queue both TX status events and
1359 * RX frames to be processed by a tasklet and process them in the
1360 * same order that they were received or TX status last. Hence, there
1361 * is no race as long as the frame RX is processed before the next TX
1362 * status, which drivers can ensure, see below.
1363 *
1364 * Note that this can only happen if the hardware or firmware can
1365 * actually add STAs to the filter list, if this is done by the
1366 * driver in response to set_tim() (which will only reduce the race
1367 * this whole filtering tries to solve, not completely solve it)
1368 * this situation cannot happen.
1369 *
1370 * To completely solve this race drivers need to make sure that they
1371 * (a) don't mix the irq-safe/not irq-safe TX status/RX processing
1372 * functions and
1373 * (b) always process RX events before TX status events if ordering
1374 * can be unknown, for example with different interrupt status
1375 * bits.
1376 */
1377 if (test_sta_flags(sta, WLAN_STA_PS) &&
1378 skb_queue_len(&sta->tx_filtered) < STA_MAX_TX_BUFFER) {
1379 ieee80211_remove_tx_extra(local, sta->key, skb);
1380 skb_queue_tail(&sta->tx_filtered, skb);
1381 return;
1382 }
1383
1384 if (!test_sta_flags(sta, WLAN_STA_PS) &&
1385 !(info->flags & IEEE80211_TX_CTL_REQUEUE)) {
1386 /* Software retry the packet once */
1387 info->flags |= IEEE80211_TX_CTL_REQUEUE;
1388 ieee80211_remove_tx_extra(local, sta->key, skb);
1389 dev_queue_xmit(skb);
1390 return;
1391 }
1392
1393 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1394 if (net_ratelimit())
1395 printk(KERN_DEBUG "%s: dropped TX filtered frame, "
1396 "queue_len=%d PS=%d @%lu\n",
1397 wiphy_name(local->hw.wiphy),
1398 skb_queue_len(&sta->tx_filtered),
1399 !!test_sta_flags(sta, WLAN_STA_PS), jiffies);
1400 #endif
1401 dev_kfree_skb(skb);
1402 }
1403
1404 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
1405 {
1406 struct sk_buff *skb2;
1407 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1408 struct ieee80211_local *local = hw_to_local(hw);
1409 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1410 u16 frag, type;
1411 __le16 fc;
1412 struct ieee80211_tx_status_rtap_hdr *rthdr;
1413 struct ieee80211_sub_if_data *sdata;
1414 struct net_device *prev_dev = NULL;
1415 struct sta_info *sta;
1416
1417 rcu_read_lock();
1418
1419 if (info->status.excessive_retries) {
1420 sta = sta_info_get(local, hdr->addr1);
1421 if (sta) {
1422 if (test_sta_flags(sta, WLAN_STA_PS)) {
1423 /*
1424 * The STA is in power save mode, so assume
1425 * that this TX packet failed because of that.
1426 */
1427 ieee80211_handle_filtered_frame(local, sta, skb);
1428 rcu_read_unlock();
1429 return;
1430 }
1431 }
1432 }
1433
1434 fc = hdr->frame_control;
1435
1436 if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
1437 (ieee80211_is_data_qos(fc))) {
1438 u16 tid, ssn;
1439 u8 *qc;
1440 sta = sta_info_get(local, hdr->addr1);
1441 if (sta) {
1442 qc = ieee80211_get_qos_ctl(hdr);
1443 tid = qc[0] & 0xf;
1444 ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
1445 & IEEE80211_SCTL_SEQ);
1446 ieee80211_send_bar(sta->sdata->dev, hdr->addr1,
1447 tid, ssn);
1448 }
1449 }
1450
1451 if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
1452 sta = sta_info_get(local, hdr->addr1);
1453 if (sta) {
1454 ieee80211_handle_filtered_frame(local, sta, skb);
1455 rcu_read_unlock();
1456 return;
1457 }
1458 } else
1459 rate_control_tx_status(local->mdev, skb);
1460
1461 rcu_read_unlock();
1462
1463 ieee80211_led_tx(local, 0);
1464
1465 /* SNMP counters
1466 * Fragments are passed to low-level drivers as separate skbs, so these
1467 * are actually fragments, not frames. Update frame counters only for
1468 * the first fragment of the frame. */
1469
1470 frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG;
1471 type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE;
1472
1473 if (info->flags & IEEE80211_TX_STAT_ACK) {
1474 if (frag == 0) {
1475 local->dot11TransmittedFrameCount++;
1476 if (is_multicast_ether_addr(hdr->addr1))
1477 local->dot11MulticastTransmittedFrameCount++;
1478 if (info->status.retry_count > 0)
1479 local->dot11RetryCount++;
1480 if (info->status.retry_count > 1)
1481 local->dot11MultipleRetryCount++;
1482 }
1483
1484 /* This counter shall be incremented for an acknowledged MPDU
1485 * with an individual address in the address 1 field or an MPDU
1486 * with a multicast address in the address 1 field of type Data
1487 * or Management. */
1488 if (!is_multicast_ether_addr(hdr->addr1) ||
1489 type == IEEE80211_FTYPE_DATA ||
1490 type == IEEE80211_FTYPE_MGMT)
1491 local->dot11TransmittedFragmentCount++;
1492 } else {
1493 if (frag == 0)
1494 local->dot11FailedCount++;
1495 }
1496
1497 /* this was a transmitted frame, but now we want to reuse it */
1498 skb_orphan(skb);
1499
1500 /*
1501 * This is a bit racy but we can avoid a lot of work
1502 * with this test...
1503 */
1504 if (!local->monitors && !local->cooked_mntrs) {
1505 dev_kfree_skb(skb);
1506 return;
1507 }
1508
1509 /* send frame to monitor interfaces now */
1510
1511 if (skb_headroom(skb) < sizeof(*rthdr)) {
1512 printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
1513 dev_kfree_skb(skb);
1514 return;
1515 }
1516
1517 rthdr = (struct ieee80211_tx_status_rtap_hdr *)
1518 skb_push(skb, sizeof(*rthdr));
1519
1520 memset(rthdr, 0, sizeof(*rthdr));
1521 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
1522 rthdr->hdr.it_present =
1523 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
1524 (1 << IEEE80211_RADIOTAP_DATA_RETRIES));
1525
1526 if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
1527 !is_multicast_ether_addr(hdr->addr1))
1528 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL);
1529
1530 if ((info->flags & IEEE80211_TX_CTL_USE_RTS_CTS) &&
1531 (info->flags & IEEE80211_TX_CTL_USE_CTS_PROTECT))
1532 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS);
1533 else if (info->flags & IEEE80211_TX_CTL_USE_RTS_CTS)
1534 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS);
1535
1536 rthdr->data_retries = info->status.retry_count;
1537
1538 /* XXX: is this sufficient for BPF? */
1539 skb_set_mac_header(skb, 0);
1540 skb->ip_summed = CHECKSUM_UNNECESSARY;
1541 skb->pkt_type = PACKET_OTHERHOST;
1542 skb->protocol = htons(ETH_P_802_2);
1543 memset(skb->cb, 0, sizeof(skb->cb));
1544
1545 rcu_read_lock();
1546 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
1547 if (sdata->vif.type == IEEE80211_IF_TYPE_MNTR) {
1548 if (!netif_running(sdata->dev))
1549 continue;
1550
1551 if (prev_dev) {
1552 skb2 = skb_clone(skb, GFP_ATOMIC);
1553 if (skb2) {
1554 skb2->dev = prev_dev;
1555 netif_rx(skb2);
1556 }
1557 }
1558
1559 prev_dev = sdata->dev;
1560 }
1561 }
1562 if (prev_dev) {
1563 skb->dev = prev_dev;
1564 netif_rx(skb);
1565 skb = NULL;
1566 }
1567 rcu_read_unlock();
1568 dev_kfree_skb(skb);
1569 }
1570 EXPORT_SYMBOL(ieee80211_tx_status);
1571
1572 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
1573 const struct ieee80211_ops *ops)
1574 {
1575 struct ieee80211_local *local;
1576 int priv_size;
1577 struct wiphy *wiphy;
1578
1579 /* Ensure 32-byte alignment of our private data and hw private data.
1580 * We use the wiphy priv data for both our ieee80211_local and for
1581 * the driver's private data
1582 *
1583 * In memory it'll be like this:
1584 *
1585 * +-------------------------+
1586 * | struct wiphy |
1587 * +-------------------------+
1588 * | struct ieee80211_local |
1589 * +-------------------------+
1590 * | driver's private data |
1591 * +-------------------------+
1592 *
1593 */
1594 priv_size = ((sizeof(struct ieee80211_local) +
1595 NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST) +
1596 priv_data_len;
1597
1598 wiphy = wiphy_new(&mac80211_config_ops, priv_size);
1599
1600 if (!wiphy)
1601 return NULL;
1602
1603 wiphy->privid = mac80211_wiphy_privid;
1604
1605 local = wiphy_priv(wiphy);
1606 local->hw.wiphy = wiphy;
1607
1608 local->hw.priv = (char *)local +
1609 ((sizeof(struct ieee80211_local) +
1610 NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);
1611
1612 BUG_ON(!ops->tx);
1613 BUG_ON(!ops->start);
1614 BUG_ON(!ops->stop);
1615 BUG_ON(!ops->config);
1616 BUG_ON(!ops->add_interface);
1617 BUG_ON(!ops->remove_interface);
1618 BUG_ON(!ops->configure_filter);
1619 local->ops = ops;
1620
1621 local->hw.queues = 1; /* default */
1622
1623 local->bridge_packets = 1;
1624
1625 local->rts_threshold = IEEE80211_MAX_RTS_THRESHOLD;
1626 local->fragmentation_threshold = IEEE80211_MAX_FRAG_THRESHOLD;
1627 local->short_retry_limit = 7;
1628 local->long_retry_limit = 4;
1629 local->hw.conf.radio_enabled = 1;
1630
1631 INIT_LIST_HEAD(&local->interfaces);
1632
1633 spin_lock_init(&local->key_lock);
1634
1635 INIT_DELAYED_WORK(&local->scan_work, ieee80211_sta_scan_work);
1636
1637 sta_info_init(local);
1638
1639 tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
1640 (unsigned long)local);
1641 tasklet_disable(&local->tx_pending_tasklet);
1642
1643 tasklet_init(&local->tasklet,
1644 ieee80211_tasklet_handler,
1645 (unsigned long) local);
1646 tasklet_disable(&local->tasklet);
1647
1648 skb_queue_head_init(&local->skb_queue);
1649 skb_queue_head_init(&local->skb_queue_unreliable);
1650
1651 return local_to_hw(local);
1652 }
1653 EXPORT_SYMBOL(ieee80211_alloc_hw);
1654
1655 int ieee80211_register_hw(struct ieee80211_hw *hw)
1656 {
1657 struct ieee80211_local *local = hw_to_local(hw);
1658 const char *name;
1659 int result;
1660 enum ieee80211_band band;
1661 struct net_device *mdev;
1662 struct ieee80211_sub_if_data *sdata;
1663
1664 /*
1665 * generic code guarantees at least one band,
1666 * set this very early because much code assumes
1667 * that hw.conf.channel is assigned
1668 */
1669 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1670 struct ieee80211_supported_band *sband;
1671
1672 sband = local->hw.wiphy->bands[band];
1673 if (sband) {
1674 /* init channel we're on */
1675 local->hw.conf.channel =
1676 local->oper_channel =
1677 local->scan_channel = &sband->channels[0];
1678 break;
1679 }
1680 }
1681
1682 result = wiphy_register(local->hw.wiphy);
1683 if (result < 0)
1684 return result;
1685
1686 /*
1687 * We use the number of queues for feature tests (QoS, HT) internally
1688 * so restrict them appropriately.
1689 */
1690 #ifdef CONFIG_MAC80211_QOS
1691 if (hw->queues > IEEE80211_MAX_QUEUES)
1692 hw->queues = IEEE80211_MAX_QUEUES;
1693 if (hw->ampdu_queues > IEEE80211_MAX_AMPDU_QUEUES)
1694 hw->ampdu_queues = IEEE80211_MAX_AMPDU_QUEUES;
1695 if (hw->queues < 4)
1696 hw->ampdu_queues = 0;
1697 #else
1698 hw->queues = 1;
1699 hw->ampdu_queues = 0;
1700 #endif
1701
1702 /* for now, mdev needs sub_if_data :/ */
1703 mdev = alloc_netdev_mq(sizeof(struct ieee80211_sub_if_data),
1704 "wmaster%d", ether_setup,
1705 ieee80211_num_queues(hw));
1706 if (!mdev)
1707 goto fail_mdev_alloc;
1708
1709 if (ieee80211_num_queues(hw) > 1)
1710 mdev->features |= NETIF_F_MULTI_QUEUE;
1711
1712 sdata = IEEE80211_DEV_TO_SUB_IF(mdev);
1713 mdev->ieee80211_ptr = &sdata->wdev;
1714 sdata->wdev.wiphy = local->hw.wiphy;
1715
1716 local->mdev = mdev;
1717
1718 ieee80211_rx_bss_list_init(mdev);
1719
1720 mdev->hard_start_xmit = ieee80211_master_start_xmit;
1721 mdev->open = ieee80211_master_open;
1722 mdev->stop = ieee80211_master_stop;
1723 mdev->type = ARPHRD_IEEE80211;
1724 mdev->header_ops = &ieee80211_header_ops;
1725 mdev->set_multicast_list = ieee80211_master_set_multicast_list;
1726
1727 sdata->vif.type = IEEE80211_IF_TYPE_AP;
1728 sdata->dev = mdev;
1729 sdata->local = local;
1730 sdata->u.ap.force_unicast_rateidx = -1;
1731 sdata->u.ap.max_ratectrl_rateidx = -1;
1732 ieee80211_if_sdata_init(sdata);
1733
1734 /* no RCU needed since we're still during init phase */
1735 list_add_tail(&sdata->list, &local->interfaces);
1736
1737 name = wiphy_dev(local->hw.wiphy)->driver->name;
1738 local->hw.workqueue = create_freezeable_workqueue(name);
1739 if (!local->hw.workqueue) {
1740 result = -ENOMEM;
1741 goto fail_workqueue;
1742 }
1743
1744 /*
1745 * The hardware needs headroom for sending the frame,
1746 * and we need some headroom for passing the frame to monitor
1747 * interfaces, but never both at the same time.
1748 */
1749 local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
1750 sizeof(struct ieee80211_tx_status_rtap_hdr));
1751
1752 debugfs_hw_add(local);
1753
1754 if (local->hw.conf.beacon_int < 10)
1755 local->hw.conf.beacon_int = 100;
1756
1757 local->wstats_flags |= local->hw.flags & (IEEE80211_HW_SIGNAL_UNSPEC |
1758 IEEE80211_HW_SIGNAL_DB |
1759 IEEE80211_HW_SIGNAL_DBM) ?
1760 IW_QUAL_QUAL_UPDATED : IW_QUAL_QUAL_INVALID;
1761 local->wstats_flags |= local->hw.flags & IEEE80211_HW_NOISE_DBM ?
1762 IW_QUAL_NOISE_UPDATED : IW_QUAL_NOISE_INVALID;
1763 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
1764 local->wstats_flags |= IW_QUAL_DBM;
1765
1766 result = sta_info_start(local);
1767 if (result < 0)
1768 goto fail_sta_info;
1769
1770 rtnl_lock();
1771 result = dev_alloc_name(local->mdev, local->mdev->name);
1772 if (result < 0)
1773 goto fail_dev;
1774
1775 memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1776 SET_NETDEV_DEV(local->mdev, wiphy_dev(local->hw.wiphy));
1777
1778 result = register_netdevice(local->mdev);
1779 if (result < 0)
1780 goto fail_dev;
1781
1782 ieee80211_debugfs_add_netdev(IEEE80211_DEV_TO_SUB_IF(local->mdev));
1783 ieee80211_if_set_type(local->mdev, IEEE80211_IF_TYPE_AP);
1784
1785 result = ieee80211_init_rate_ctrl_alg(local,
1786 hw->rate_control_algorithm);
1787 if (result < 0) {
1788 printk(KERN_DEBUG "%s: Failed to initialize rate control "
1789 "algorithm\n", wiphy_name(local->hw.wiphy));
1790 goto fail_rate;
1791 }
1792
1793 result = ieee80211_wep_init(local);
1794
1795 if (result < 0) {
1796 printk(KERN_DEBUG "%s: Failed to initialize wep\n",
1797 wiphy_name(local->hw.wiphy));
1798 goto fail_wep;
1799 }
1800
1801 ieee80211_install_qdisc(local->mdev);
1802
1803 /* add one default STA interface */
1804 result = ieee80211_if_add(local->mdev, "wlan%d", NULL,
1805 IEEE80211_IF_TYPE_STA, NULL);
1806 if (result)
1807 printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
1808 wiphy_name(local->hw.wiphy));
1809
1810 local->reg_state = IEEE80211_DEV_REGISTERED;
1811 rtnl_unlock();
1812
1813 ieee80211_led_init(local);
1814
1815 return 0;
1816
1817 fail_wep:
1818 rate_control_deinitialize(local);
1819 fail_rate:
1820 ieee80211_debugfs_remove_netdev(IEEE80211_DEV_TO_SUB_IF(local->mdev));
1821 unregister_netdevice(local->mdev);
1822 local->mdev = NULL;
1823 fail_dev:
1824 rtnl_unlock();
1825 sta_info_stop(local);
1826 fail_sta_info:
1827 debugfs_hw_del(local);
1828 destroy_workqueue(local->hw.workqueue);
1829 fail_workqueue:
1830 if (local->mdev != NULL) {
1831 ieee80211_if_free(local->mdev);
1832 local->mdev = NULL;
1833 }
1834 fail_mdev_alloc:
1835 wiphy_unregister(local->hw.wiphy);
1836 return result;
1837 }
1838 EXPORT_SYMBOL(ieee80211_register_hw);
1839
1840 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
1841 {
1842 struct ieee80211_local *local = hw_to_local(hw);
1843 struct ieee80211_sub_if_data *sdata, *tmp;
1844
1845 tasklet_kill(&local->tx_pending_tasklet);
1846 tasklet_kill(&local->tasklet);
1847
1848 rtnl_lock();
1849
1850 BUG_ON(local->reg_state != IEEE80211_DEV_REGISTERED);
1851
1852 local->reg_state = IEEE80211_DEV_UNREGISTERED;
1853
1854 /*
1855 * At this point, interface list manipulations are fine
1856 * because the driver cannot be handing us frames any
1857 * more and the tasklet is killed.
1858 */
1859
1860 /*
1861 * First, we remove all non-master interfaces. Do this because they
1862 * may have bss pointer dependency on the master, and when we free
1863 * the master these would be freed as well, breaking our list
1864 * iteration completely.
1865 */
1866 list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1867 if (sdata->dev == local->mdev)
1868 continue;
1869 list_del(&sdata->list);
1870 __ieee80211_if_del(local, sdata);
1871 }
1872
1873 /* then, finally, remove the master interface */
1874 __ieee80211_if_del(local, IEEE80211_DEV_TO_SUB_IF(local->mdev));
1875
1876 rtnl_unlock();
1877
1878 ieee80211_rx_bss_list_deinit(local->mdev);
1879 ieee80211_clear_tx_pending(local);
1880 sta_info_stop(local);
1881 rate_control_deinitialize(local);
1882 debugfs_hw_del(local);
1883
1884 if (skb_queue_len(&local->skb_queue)
1885 || skb_queue_len(&local->skb_queue_unreliable))
1886 printk(KERN_WARNING "%s: skb_queue not empty\n",
1887 wiphy_name(local->hw.wiphy));
1888 skb_queue_purge(&local->skb_queue);
1889 skb_queue_purge(&local->skb_queue_unreliable);
1890
1891 destroy_workqueue(local->hw.workqueue);
1892 wiphy_unregister(local->hw.wiphy);
1893 ieee80211_wep_free(local);
1894 ieee80211_led_exit(local);
1895 ieee80211_if_free(local->mdev);
1896 local->mdev = NULL;
1897 }
1898 EXPORT_SYMBOL(ieee80211_unregister_hw);
1899
1900 void ieee80211_free_hw(struct ieee80211_hw *hw)
1901 {
1902 struct ieee80211_local *local = hw_to_local(hw);
1903
1904 wiphy_free(local->hw.wiphy);
1905 }
1906 EXPORT_SYMBOL(ieee80211_free_hw);
1907
1908 static int __init ieee80211_init(void)
1909 {
1910 struct sk_buff *skb;
1911 int ret;
1912
1913 BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1914 BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1915 IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1916
1917 ret = rc80211_pid_init();
1918 if (ret)
1919 goto out;
1920
1921 ret = ieee80211_wme_register();
1922 if (ret) {
1923 printk(KERN_DEBUG "ieee80211_init: failed to "
1924 "initialize WME (err=%d)\n", ret);
1925 goto out_cleanup_pid;
1926 }
1927
1928 ieee80211_debugfs_netdev_init();
1929
1930 return 0;
1931
1932 out_cleanup_pid:
1933 rc80211_pid_exit();
1934 out:
1935 return ret;
1936 }
1937
1938 static void __exit ieee80211_exit(void)
1939 {
1940 rc80211_pid_exit();
1941
1942 /*
1943 * For key todo, it'll be empty by now but the work
1944 * might still be scheduled.
1945 */
1946 flush_scheduled_work();
1947
1948 if (mesh_allocated)
1949 ieee80211s_stop();
1950
1951 ieee80211_wme_unregister();
1952 ieee80211_debugfs_netdev_exit();
1953 }
1954
1955
1956 subsys_initcall(ieee80211_init);
1957 module_exit(ieee80211_exit);
1958
1959 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1960 MODULE_LICENSE("GPL");
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