xref: /openbmc/linux/net/mac80211/main.c (revision 545e4006)
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 (netif_running(sdata->dev)) {
109 			res = 0;
110 			break;
111 		}
112 	}
113 
114 	if (res)
115 		return res;
116 
117 	netif_tx_start_all_queues(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 (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 && 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 			 * The remaining checks are only performed for interfaces
214 			 * with the same MAC address.
215 			 */
216 			if (compare_ether_addr(dev->dev_addr, ndev->dev_addr))
217 				continue;
218 
219 			/*
220 			 * check whether it may have the same address
221 			 */
222 			if (!identical_mac_addr_allowed(sdata->vif.type,
223 							nsdata->vif.type))
224 				return -ENOTUNIQ;
225 
226 			/*
227 			 * can only add VLANs to enabled APs
228 			 */
229 			if (sdata->vif.type == IEEE80211_IF_TYPE_VLAN &&
230 			    nsdata->vif.type == IEEE80211_IF_TYPE_AP)
231 				sdata->bss = &nsdata->u.ap;
232 		}
233 	}
234 
235 	switch (sdata->vif.type) {
236 	case IEEE80211_IF_TYPE_WDS:
237 		if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
238 			return -ENOLINK;
239 		break;
240 	case IEEE80211_IF_TYPE_VLAN:
241 		if (!sdata->bss)
242 			return -ENOLINK;
243 		list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
244 		break;
245 	case IEEE80211_IF_TYPE_AP:
246 		sdata->bss = &sdata->u.ap;
247 		break;
248 	case IEEE80211_IF_TYPE_STA:
249 	case IEEE80211_IF_TYPE_MNTR:
250 	case IEEE80211_IF_TYPE_IBSS:
251 	case IEEE80211_IF_TYPE_MESH_POINT:
252 		/* no special treatment */
253 		break;
254 	case IEEE80211_IF_TYPE_INVALID:
255 		/* cannot happen */
256 		WARN_ON(1);
257 		break;
258 	}
259 
260 	if (local->open_count == 0) {
261 		res = 0;
262 		if (local->ops->start)
263 			res = local->ops->start(local_to_hw(local));
264 		if (res)
265 			goto err_del_bss;
266 		need_hw_reconfig = 1;
267 		ieee80211_led_radio(local, local->hw.conf.radio_enabled);
268 	}
269 
270 	switch (sdata->vif.type) {
271 	case IEEE80211_IF_TYPE_VLAN:
272 		/* no need to tell driver */
273 		break;
274 	case IEEE80211_IF_TYPE_MNTR:
275 		if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
276 			local->cooked_mntrs++;
277 			break;
278 		}
279 
280 		/* must be before the call to ieee80211_configure_filter */
281 		local->monitors++;
282 		if (local->monitors == 1)
283 			local->hw.conf.flags |= IEEE80211_CONF_RADIOTAP;
284 
285 		if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
286 			local->fif_fcsfail++;
287 		if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
288 			local->fif_plcpfail++;
289 		if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL)
290 			local->fif_control++;
291 		if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
292 			local->fif_other_bss++;
293 
294 		netif_addr_lock_bh(local->mdev);
295 		ieee80211_configure_filter(local);
296 		netif_addr_unlock_bh(local->mdev);
297 		break;
298 	case IEEE80211_IF_TYPE_STA:
299 	case IEEE80211_IF_TYPE_IBSS:
300 		sdata->u.sta.flags &= ~IEEE80211_STA_PREV_BSSID_SET;
301 		/* fall through */
302 	default:
303 		conf.vif = &sdata->vif;
304 		conf.type = sdata->vif.type;
305 		conf.mac_addr = dev->dev_addr;
306 		res = local->ops->add_interface(local_to_hw(local), &conf);
307 		if (res)
308 			goto err_stop;
309 
310 		if (ieee80211_vif_is_mesh(&sdata->vif))
311 			ieee80211_start_mesh(sdata->dev);
312 		changed |= ieee80211_reset_erp_info(dev);
313 		ieee80211_bss_info_change_notify(sdata, changed);
314 		ieee80211_enable_keys(sdata);
315 
316 		if (sdata->vif.type == IEEE80211_IF_TYPE_STA &&
317 		    !(sdata->flags & IEEE80211_SDATA_USERSPACE_MLME))
318 			netif_carrier_off(dev);
319 		else
320 			netif_carrier_on(dev);
321 	}
322 
323 	if (sdata->vif.type == IEEE80211_IF_TYPE_WDS) {
324 		/* Create STA entry for the WDS peer */
325 		sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
326 				     GFP_KERNEL);
327 		if (!sta) {
328 			res = -ENOMEM;
329 			goto err_del_interface;
330 		}
331 
332 		/* no locking required since STA is not live yet */
333 		sta->flags |= WLAN_STA_AUTHORIZED;
334 
335 		res = sta_info_insert(sta);
336 		if (res) {
337 			/* STA has been freed */
338 			goto err_del_interface;
339 		}
340 	}
341 
342 	if (local->open_count == 0) {
343 		res = dev_open(local->mdev);
344 		WARN_ON(res);
345 		if (res)
346 			goto err_del_interface;
347 		tasklet_enable(&local->tx_pending_tasklet);
348 		tasklet_enable(&local->tasklet);
349 	}
350 
351 	/*
352 	 * set_multicast_list will be invoked by the networking core
353 	 * which will check whether any increments here were done in
354 	 * error and sync them down to the hardware as filter flags.
355 	 */
356 	if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
357 		atomic_inc(&local->iff_allmultis);
358 
359 	if (sdata->flags & IEEE80211_SDATA_PROMISC)
360 		atomic_inc(&local->iff_promiscs);
361 
362 	local->open_count++;
363 	if (need_hw_reconfig)
364 		ieee80211_hw_config(local);
365 
366 	/*
367 	 * ieee80211_sta_work is disabled while network interface
368 	 * is down. Therefore, some configuration changes may not
369 	 * yet be effective. Trigger execution of ieee80211_sta_work
370 	 * to fix this.
371 	 */
372 	if (sdata->vif.type == IEEE80211_IF_TYPE_STA ||
373 	    sdata->vif.type == IEEE80211_IF_TYPE_IBSS) {
374 		struct ieee80211_if_sta *ifsta = &sdata->u.sta;
375 		queue_work(local->hw.workqueue, &ifsta->work);
376 	}
377 
378 	netif_tx_start_all_queues(dev);
379 
380 	return 0;
381  err_del_interface:
382 	local->ops->remove_interface(local_to_hw(local), &conf);
383  err_stop:
384 	if (!local->open_count && local->ops->stop)
385 		local->ops->stop(local_to_hw(local));
386  err_del_bss:
387 	sdata->bss = NULL;
388 	if (sdata->vif.type == IEEE80211_IF_TYPE_VLAN)
389 		list_del(&sdata->u.vlan.list);
390 	return res;
391 }
392 
393 static int ieee80211_stop(struct net_device *dev)
394 {
395 	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
396 	struct ieee80211_local *local = sdata->local;
397 	struct ieee80211_if_init_conf conf;
398 	struct sta_info *sta;
399 
400 	/*
401 	 * Stop TX on this interface first.
402 	 */
403 	netif_tx_stop_all_queues(dev);
404 
405 	/*
406 	 * Now delete all active aggregation sessions.
407 	 */
408 	rcu_read_lock();
409 
410 	list_for_each_entry_rcu(sta, &local->sta_list, list) {
411 		if (sta->sdata == sdata)
412 			ieee80211_sta_tear_down_BA_sessions(dev, sta->addr);
413 	}
414 
415 	rcu_read_unlock();
416 
417 	/*
418 	 * Remove all stations associated with this interface.
419 	 *
420 	 * This must be done before calling ops->remove_interface()
421 	 * because otherwise we can later invoke ops->sta_notify()
422 	 * whenever the STAs are removed, and that invalidates driver
423 	 * assumptions about always getting a vif pointer that is valid
424 	 * (because if we remove a STA after ops->remove_interface()
425 	 * the driver will have removed the vif info already!)
426 	 *
427 	 * We could relax this and only unlink the stations from the
428 	 * hash table and list but keep them on a per-sdata list that
429 	 * will be inserted back again when the interface is brought
430 	 * up again, but I don't currently see a use case for that,
431 	 * except with WDS which gets a STA entry created when it is
432 	 * brought up.
433 	 */
434 	sta_info_flush(local, sdata);
435 
436 	/*
437 	 * Don't count this interface for promisc/allmulti while it
438 	 * is down. dev_mc_unsync() will invoke set_multicast_list
439 	 * on the master interface which will sync these down to the
440 	 * hardware as filter flags.
441 	 */
442 	if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
443 		atomic_dec(&local->iff_allmultis);
444 
445 	if (sdata->flags & IEEE80211_SDATA_PROMISC)
446 		atomic_dec(&local->iff_promiscs);
447 
448 	dev_mc_unsync(local->mdev, dev);
449 
450 	/* APs need special treatment */
451 	if (sdata->vif.type == IEEE80211_IF_TYPE_AP) {
452 		struct ieee80211_sub_if_data *vlan, *tmp;
453 		struct beacon_data *old_beacon = sdata->u.ap.beacon;
454 
455 		/* remove beacon */
456 		rcu_assign_pointer(sdata->u.ap.beacon, NULL);
457 		synchronize_rcu();
458 		kfree(old_beacon);
459 
460 		/* down all dependent devices, that is VLANs */
461 		list_for_each_entry_safe(vlan, tmp, &sdata->u.ap.vlans,
462 					 u.vlan.list)
463 			dev_close(vlan->dev);
464 		WARN_ON(!list_empty(&sdata->u.ap.vlans));
465 	}
466 
467 	local->open_count--;
468 
469 	switch (sdata->vif.type) {
470 	case IEEE80211_IF_TYPE_VLAN:
471 		list_del(&sdata->u.vlan.list);
472 		/* no need to tell driver */
473 		break;
474 	case IEEE80211_IF_TYPE_MNTR:
475 		if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
476 			local->cooked_mntrs--;
477 			break;
478 		}
479 
480 		local->monitors--;
481 		if (local->monitors == 0)
482 			local->hw.conf.flags &= ~IEEE80211_CONF_RADIOTAP;
483 
484 		if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
485 			local->fif_fcsfail--;
486 		if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
487 			local->fif_plcpfail--;
488 		if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL)
489 			local->fif_control--;
490 		if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
491 			local->fif_other_bss--;
492 
493 		netif_addr_lock_bh(local->mdev);
494 		ieee80211_configure_filter(local);
495 		netif_addr_unlock_bh(local->mdev);
496 		break;
497 	case IEEE80211_IF_TYPE_MESH_POINT:
498 	case IEEE80211_IF_TYPE_STA:
499 	case IEEE80211_IF_TYPE_IBSS:
500 		sdata->u.sta.state = IEEE80211_DISABLED;
501 		memset(sdata->u.sta.bssid, 0, ETH_ALEN);
502 		del_timer_sync(&sdata->u.sta.timer);
503 		/*
504 		 * When we get here, the interface is marked down.
505 		 * Call synchronize_rcu() to wait for the RX path
506 		 * should it be using the interface and enqueuing
507 		 * frames at this very time on another CPU.
508 		 */
509 		synchronize_rcu();
510 		skb_queue_purge(&sdata->u.sta.skb_queue);
511 
512 		if (local->scan_dev == sdata->dev) {
513 			if (!local->ops->hw_scan) {
514 				local->sta_sw_scanning = 0;
515 				cancel_delayed_work(&local->scan_work);
516 			} else
517 				local->sta_hw_scanning = 0;
518 		}
519 
520 		sdata->u.sta.flags &= ~IEEE80211_STA_PRIVACY_INVOKED;
521 		kfree(sdata->u.sta.extra_ie);
522 		sdata->u.sta.extra_ie = NULL;
523 		sdata->u.sta.extra_ie_len = 0;
524 		/* fall through */
525 	default:
526 		conf.vif = &sdata->vif;
527 		conf.type = sdata->vif.type;
528 		conf.mac_addr = dev->dev_addr;
529 		/* disable all keys for as long as this netdev is down */
530 		ieee80211_disable_keys(sdata);
531 		local->ops->remove_interface(local_to_hw(local), &conf);
532 	}
533 
534 	sdata->bss = NULL;
535 
536 	if (local->open_count == 0) {
537 		if (netif_running(local->mdev))
538 			dev_close(local->mdev);
539 
540 		if (local->ops->stop)
541 			local->ops->stop(local_to_hw(local));
542 
543 		ieee80211_led_radio(local, 0);
544 
545 		flush_workqueue(local->hw.workqueue);
546 
547 		tasklet_disable(&local->tx_pending_tasklet);
548 		tasklet_disable(&local->tasklet);
549 	}
550 
551 	return 0;
552 }
553 
554 int ieee80211_start_tx_ba_session(struct ieee80211_hw *hw, u8 *ra, u16 tid)
555 {
556 	struct ieee80211_local *local = hw_to_local(hw);
557 	struct sta_info *sta;
558 	struct ieee80211_sub_if_data *sdata;
559 	u16 start_seq_num = 0;
560 	u8 *state;
561 	int ret;
562 	DECLARE_MAC_BUF(mac);
563 
564 	if (tid >= STA_TID_NUM)
565 		return -EINVAL;
566 
567 #ifdef CONFIG_MAC80211_HT_DEBUG
568 	printk(KERN_DEBUG "Open BA session requested for %s tid %u\n",
569 				print_mac(mac, ra), tid);
570 #endif /* CONFIG_MAC80211_HT_DEBUG */
571 
572 	rcu_read_lock();
573 
574 	sta = sta_info_get(local, ra);
575 	if (!sta) {
576 #ifdef CONFIG_MAC80211_HT_DEBUG
577 		printk(KERN_DEBUG "Could not find the station\n");
578 #endif
579 		ret = -ENOENT;
580 		goto exit;
581 	}
582 
583 	spin_lock_bh(&sta->lock);
584 
585 	/* we have tried too many times, receiver does not want A-MPDU */
586 	if (sta->ampdu_mlme.addba_req_num[tid] > HT_AGG_MAX_RETRIES) {
587 		ret = -EBUSY;
588 		goto err_unlock_sta;
589 	}
590 
591 	state = &sta->ampdu_mlme.tid_state_tx[tid];
592 	/* check if the TID is not in aggregation flow already */
593 	if (*state != HT_AGG_STATE_IDLE) {
594 #ifdef CONFIG_MAC80211_HT_DEBUG
595 		printk(KERN_DEBUG "BA request denied - session is not "
596 				 "idle on tid %u\n", tid);
597 #endif /* CONFIG_MAC80211_HT_DEBUG */
598 		ret = -EAGAIN;
599 		goto err_unlock_sta;
600 	}
601 
602 	/* prepare A-MPDU MLME for Tx aggregation */
603 	sta->ampdu_mlme.tid_tx[tid] =
604 			kmalloc(sizeof(struct tid_ampdu_tx), GFP_ATOMIC);
605 	if (!sta->ampdu_mlme.tid_tx[tid]) {
606 #ifdef CONFIG_MAC80211_HT_DEBUG
607 		if (net_ratelimit())
608 			printk(KERN_ERR "allocate tx mlme to tid %d failed\n",
609 					tid);
610 #endif
611 		ret = -ENOMEM;
612 		goto err_unlock_sta;
613 	}
614 	/* Tx timer */
615 	sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.function =
616 			sta_addba_resp_timer_expired;
617 	sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.data =
618 			(unsigned long)&sta->timer_to_tid[tid];
619 	init_timer(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer);
620 
621 	/* create a new queue for this aggregation */
622 	ret = ieee80211_ht_agg_queue_add(local, sta, tid);
623 
624 	/* case no queue is available to aggregation
625 	 * don't switch to aggregation */
626 	if (ret) {
627 #ifdef CONFIG_MAC80211_HT_DEBUG
628 		printk(KERN_DEBUG "BA request denied - queue unavailable for"
629 					" tid %d\n", tid);
630 #endif /* CONFIG_MAC80211_HT_DEBUG */
631 		goto err_unlock_queue;
632 	}
633 	sdata = sta->sdata;
634 
635 	/* Ok, the Addba frame hasn't been sent yet, but if the driver calls the
636 	 * call back right away, it must see that the flow has begun */
637 	*state |= HT_ADDBA_REQUESTED_MSK;
638 
639 	if (local->ops->ampdu_action)
640 		ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_TX_START,
641 						ra, tid, &start_seq_num);
642 
643 	if (ret) {
644 		/* No need to requeue the packets in the agg queue, since we
645 		 * held the tx lock: no packet could be enqueued to the newly
646 		 * allocated queue */
647 		ieee80211_ht_agg_queue_remove(local, sta, tid, 0);
648 #ifdef CONFIG_MAC80211_HT_DEBUG
649 		printk(KERN_DEBUG "BA request denied - HW unavailable for"
650 					" tid %d\n", tid);
651 #endif /* CONFIG_MAC80211_HT_DEBUG */
652 		*state = HT_AGG_STATE_IDLE;
653 		goto err_unlock_queue;
654 	}
655 
656 	/* Will put all the packets in the new SW queue */
657 	ieee80211_requeue(local, ieee802_1d_to_ac[tid]);
658 	spin_unlock_bh(&sta->lock);
659 
660 	/* send an addBA request */
661 	sta->ampdu_mlme.dialog_token_allocator++;
662 	sta->ampdu_mlme.tid_tx[tid]->dialog_token =
663 			sta->ampdu_mlme.dialog_token_allocator;
664 	sta->ampdu_mlme.tid_tx[tid]->ssn = start_seq_num;
665 
666 
667 	ieee80211_send_addba_request(sta->sdata->dev, ra, tid,
668 			 sta->ampdu_mlme.tid_tx[tid]->dialog_token,
669 			 sta->ampdu_mlme.tid_tx[tid]->ssn,
670 			 0x40, 5000);
671 	/* activate the timer for the recipient's addBA response */
672 	sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.expires =
673 				jiffies + ADDBA_RESP_INTERVAL;
674 	add_timer(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer);
675 #ifdef CONFIG_MAC80211_HT_DEBUG
676 	printk(KERN_DEBUG "activated addBA response timer on tid %d\n", tid);
677 #endif
678 	goto exit;
679 
680 err_unlock_queue:
681 	kfree(sta->ampdu_mlme.tid_tx[tid]);
682 	sta->ampdu_mlme.tid_tx[tid] = NULL;
683 	ret = -EBUSY;
684 err_unlock_sta:
685 	spin_unlock_bh(&sta->lock);
686 exit:
687 	rcu_read_unlock();
688 	return ret;
689 }
690 EXPORT_SYMBOL(ieee80211_start_tx_ba_session);
691 
692 int ieee80211_stop_tx_ba_session(struct ieee80211_hw *hw,
693 				 u8 *ra, u16 tid,
694 				 enum ieee80211_back_parties initiator)
695 {
696 	struct ieee80211_local *local = hw_to_local(hw);
697 	struct sta_info *sta;
698 	u8 *state;
699 	int ret = 0;
700 	DECLARE_MAC_BUF(mac);
701 
702 	if (tid >= STA_TID_NUM)
703 		return -EINVAL;
704 
705 	rcu_read_lock();
706 	sta = sta_info_get(local, ra);
707 	if (!sta) {
708 		rcu_read_unlock();
709 		return -ENOENT;
710 	}
711 
712 	/* check if the TID is in aggregation */
713 	state = &sta->ampdu_mlme.tid_state_tx[tid];
714 	spin_lock_bh(&sta->lock);
715 
716 	if (*state != HT_AGG_STATE_OPERATIONAL) {
717 		ret = -ENOENT;
718 		goto stop_BA_exit;
719 	}
720 
721 #ifdef CONFIG_MAC80211_HT_DEBUG
722 	printk(KERN_DEBUG "Tx BA session stop requested for %s tid %u\n",
723 				print_mac(mac, ra), tid);
724 #endif /* CONFIG_MAC80211_HT_DEBUG */
725 
726 	ieee80211_stop_queue(hw, sta->tid_to_tx_q[tid]);
727 
728 	*state = HT_AGG_STATE_REQ_STOP_BA_MSK |
729 		(initiator << HT_AGG_STATE_INITIATOR_SHIFT);
730 
731 	if (local->ops->ampdu_action)
732 		ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_TX_STOP,
733 						ra, tid, NULL);
734 
735 	/* case HW denied going back to legacy */
736 	if (ret) {
737 		WARN_ON(ret != -EBUSY);
738 		*state = HT_AGG_STATE_OPERATIONAL;
739 		ieee80211_wake_queue(hw, sta->tid_to_tx_q[tid]);
740 		goto stop_BA_exit;
741 	}
742 
743 stop_BA_exit:
744 	spin_unlock_bh(&sta->lock);
745 	rcu_read_unlock();
746 	return ret;
747 }
748 EXPORT_SYMBOL(ieee80211_stop_tx_ba_session);
749 
750 void ieee80211_start_tx_ba_cb(struct ieee80211_hw *hw, u8 *ra, u16 tid)
751 {
752 	struct ieee80211_local *local = hw_to_local(hw);
753 	struct sta_info *sta;
754 	u8 *state;
755 	DECLARE_MAC_BUF(mac);
756 
757 	if (tid >= STA_TID_NUM) {
758 #ifdef CONFIG_MAC80211_HT_DEBUG
759 		printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n",
760 				tid, STA_TID_NUM);
761 #endif
762 		return;
763 	}
764 
765 	rcu_read_lock();
766 	sta = sta_info_get(local, ra);
767 	if (!sta) {
768 		rcu_read_unlock();
769 #ifdef CONFIG_MAC80211_HT_DEBUG
770 		printk(KERN_DEBUG "Could not find station: %s\n",
771 				print_mac(mac, ra));
772 #endif
773 		return;
774 	}
775 
776 	state = &sta->ampdu_mlme.tid_state_tx[tid];
777 	spin_lock_bh(&sta->lock);
778 
779 	if (!(*state & HT_ADDBA_REQUESTED_MSK)) {
780 #ifdef CONFIG_MAC80211_HT_DEBUG
781 		printk(KERN_DEBUG "addBA was not requested yet, state is %d\n",
782 				*state);
783 #endif
784 		spin_unlock_bh(&sta->lock);
785 		rcu_read_unlock();
786 		return;
787 	}
788 
789 	WARN_ON_ONCE(*state & HT_ADDBA_DRV_READY_MSK);
790 
791 	*state |= HT_ADDBA_DRV_READY_MSK;
792 
793 	if (*state == HT_AGG_STATE_OPERATIONAL) {
794 #ifdef CONFIG_MAC80211_HT_DEBUG
795 		printk(KERN_DEBUG "Aggregation is on for tid %d \n", tid);
796 #endif
797 		ieee80211_wake_queue(hw, sta->tid_to_tx_q[tid]);
798 	}
799 	spin_unlock_bh(&sta->lock);
800 	rcu_read_unlock();
801 }
802 EXPORT_SYMBOL(ieee80211_start_tx_ba_cb);
803 
804 void ieee80211_stop_tx_ba_cb(struct ieee80211_hw *hw, u8 *ra, u8 tid)
805 {
806 	struct ieee80211_local *local = hw_to_local(hw);
807 	struct sta_info *sta;
808 	u8 *state;
809 	int agg_queue;
810 	DECLARE_MAC_BUF(mac);
811 
812 	if (tid >= STA_TID_NUM) {
813 #ifdef CONFIG_MAC80211_HT_DEBUG
814 		printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n",
815 				tid, STA_TID_NUM);
816 #endif
817 		return;
818 	}
819 
820 #ifdef CONFIG_MAC80211_HT_DEBUG
821 	printk(KERN_DEBUG "Stopping Tx BA session for %s tid %d\n",
822 				print_mac(mac, ra), tid);
823 #endif /* CONFIG_MAC80211_HT_DEBUG */
824 
825 	rcu_read_lock();
826 	sta = sta_info_get(local, ra);
827 	if (!sta) {
828 #ifdef CONFIG_MAC80211_HT_DEBUG
829 		printk(KERN_DEBUG "Could not find station: %s\n",
830 				print_mac(mac, ra));
831 #endif
832 		rcu_read_unlock();
833 		return;
834 	}
835 	state = &sta->ampdu_mlme.tid_state_tx[tid];
836 
837 	/* NOTE: no need to use sta->lock in this state check, as
838 	 * ieee80211_stop_tx_ba_session will let only one stop call to
839 	 * pass through per sta/tid
840 	 */
841 	if ((*state & HT_AGG_STATE_REQ_STOP_BA_MSK) == 0) {
842 #ifdef CONFIG_MAC80211_HT_DEBUG
843 		printk(KERN_DEBUG "unexpected callback to A-MPDU stop\n");
844 #endif
845 		rcu_read_unlock();
846 		return;
847 	}
848 
849 	if (*state & HT_AGG_STATE_INITIATOR_MSK)
850 		ieee80211_send_delba(sta->sdata->dev, ra, tid,
851 			WLAN_BACK_INITIATOR, WLAN_REASON_QSTA_NOT_USE);
852 
853 	agg_queue = sta->tid_to_tx_q[tid];
854 
855 	ieee80211_ht_agg_queue_remove(local, sta, tid, 1);
856 
857 	/* We just requeued the all the frames that were in the
858 	 * removed queue, and since we might miss a softirq we do
859 	 * netif_schedule_queue.  ieee80211_wake_queue is not used
860 	 * here as this queue is not necessarily stopped
861 	 */
862 	netif_schedule_queue(netdev_get_tx_queue(local->mdev, agg_queue));
863 	spin_lock_bh(&sta->lock);
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 #ifdef CONFIG_MAC80211_HT_DEBUG
883 		if (net_ratelimit())
884 			printk(KERN_WARNING "%s: Not enough memory, "
885 			       "dropping start BA session", skb->dev->name);
886 #endif
887 		return;
888 	}
889 	ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
890 	memcpy(&ra_tid->ra, ra, ETH_ALEN);
891 	ra_tid->tid = tid;
892 
893 	skb->pkt_type = IEEE80211_ADDBA_MSG;
894 	skb_queue_tail(&local->skb_queue, skb);
895 	tasklet_schedule(&local->tasklet);
896 }
897 EXPORT_SYMBOL(ieee80211_start_tx_ba_cb_irqsafe);
898 
899 void ieee80211_stop_tx_ba_cb_irqsafe(struct ieee80211_hw *hw,
900 				     const u8 *ra, u16 tid)
901 {
902 	struct ieee80211_local *local = hw_to_local(hw);
903 	struct ieee80211_ra_tid *ra_tid;
904 	struct sk_buff *skb = dev_alloc_skb(0);
905 
906 	if (unlikely(!skb)) {
907 #ifdef CONFIG_MAC80211_HT_DEBUG
908 		if (net_ratelimit())
909 			printk(KERN_WARNING "%s: Not enough memory, "
910 			       "dropping stop BA session", skb->dev->name);
911 #endif
912 		return;
913 	}
914 	ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
915 	memcpy(&ra_tid->ra, ra, ETH_ALEN);
916 	ra_tid->tid = tid;
917 
918 	skb->pkt_type = IEEE80211_DELBA_MSG;
919 	skb_queue_tail(&local->skb_queue, skb);
920 	tasklet_schedule(&local->tasklet);
921 }
922 EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb_irqsafe);
923 
924 static void ieee80211_set_multicast_list(struct net_device *dev)
925 {
926 	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
927 	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
928 	int allmulti, promisc, sdata_allmulti, sdata_promisc;
929 
930 	allmulti = !!(dev->flags & IFF_ALLMULTI);
931 	promisc = !!(dev->flags & IFF_PROMISC);
932 	sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
933 	sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
934 
935 	if (allmulti != sdata_allmulti) {
936 		if (dev->flags & IFF_ALLMULTI)
937 			atomic_inc(&local->iff_allmultis);
938 		else
939 			atomic_dec(&local->iff_allmultis);
940 		sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
941 	}
942 
943 	if (promisc != sdata_promisc) {
944 		if (dev->flags & IFF_PROMISC)
945 			atomic_inc(&local->iff_promiscs);
946 		else
947 			atomic_dec(&local->iff_promiscs);
948 		sdata->flags ^= IEEE80211_SDATA_PROMISC;
949 	}
950 
951 	dev_mc_sync(local->mdev, dev);
952 }
953 
954 static const struct header_ops ieee80211_header_ops = {
955 	.create		= eth_header,
956 	.parse		= header_parse_80211,
957 	.rebuild	= eth_rebuild_header,
958 	.cache		= eth_header_cache,
959 	.cache_update	= eth_header_cache_update,
960 };
961 
962 void ieee80211_if_setup(struct net_device *dev)
963 {
964 	ether_setup(dev);
965 	dev->hard_start_xmit = ieee80211_subif_start_xmit;
966 	dev->wireless_handlers = &ieee80211_iw_handler_def;
967 	dev->set_multicast_list = ieee80211_set_multicast_list;
968 	dev->change_mtu = ieee80211_change_mtu;
969 	dev->open = ieee80211_open;
970 	dev->stop = ieee80211_stop;
971 	dev->destructor = free_netdev;
972 }
973 
974 /* everything else */
975 
976 int ieee80211_if_config(struct ieee80211_sub_if_data *sdata, u32 changed)
977 {
978 	struct ieee80211_local *local = sdata->local;
979 	struct ieee80211_if_conf conf;
980 
981 	if (WARN_ON(!netif_running(sdata->dev)))
982 		return 0;
983 
984 	if (!local->ops->config_interface)
985 		return 0;
986 
987 	memset(&conf, 0, sizeof(conf));
988 	conf.changed = changed;
989 
990 	if (sdata->vif.type == IEEE80211_IF_TYPE_STA ||
991 	    sdata->vif.type == IEEE80211_IF_TYPE_IBSS) {
992 		conf.bssid = sdata->u.sta.bssid;
993 		conf.ssid = sdata->u.sta.ssid;
994 		conf.ssid_len = sdata->u.sta.ssid_len;
995 	} else if (sdata->vif.type == IEEE80211_IF_TYPE_AP) {
996 		conf.bssid = sdata->dev->dev_addr;
997 		conf.ssid = sdata->u.ap.ssid;
998 		conf.ssid_len = sdata->u.ap.ssid_len;
999 	} else if (ieee80211_vif_is_mesh(&sdata->vif)) {
1000 		u8 zero[ETH_ALEN] = { 0 };
1001 		conf.bssid = zero;
1002 		conf.ssid = zero;
1003 		conf.ssid_len = 0;
1004 	} else {
1005 		WARN_ON(1);
1006 		return -EINVAL;
1007 	}
1008 
1009 	if (WARN_ON(!conf.bssid && (changed & IEEE80211_IFCC_BSSID)))
1010 		return -EINVAL;
1011 
1012 	if (WARN_ON(!conf.ssid && (changed & IEEE80211_IFCC_SSID)))
1013 		return -EINVAL;
1014 
1015 	return local->ops->config_interface(local_to_hw(local),
1016 					    &sdata->vif, &conf);
1017 }
1018 
1019 int ieee80211_hw_config(struct ieee80211_local *local)
1020 {
1021 	struct ieee80211_channel *chan;
1022 	int ret = 0;
1023 
1024 	if (local->sta_sw_scanning)
1025 		chan = local->scan_channel;
1026 	else
1027 		chan = local->oper_channel;
1028 
1029 	local->hw.conf.channel = chan;
1030 
1031 	if (!local->hw.conf.power_level)
1032 		local->hw.conf.power_level = chan->max_power;
1033 	else
1034 		local->hw.conf.power_level = min(chan->max_power,
1035 					       local->hw.conf.power_level);
1036 
1037 	local->hw.conf.max_antenna_gain = chan->max_antenna_gain;
1038 
1039 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1040 	printk(KERN_DEBUG "%s: HW CONFIG: freq=%d\n",
1041 	       wiphy_name(local->hw.wiphy), chan->center_freq);
1042 #endif
1043 
1044 	if (local->open_count)
1045 		ret = local->ops->config(local_to_hw(local), &local->hw.conf);
1046 
1047 	return ret;
1048 }
1049 
1050 /**
1051  * ieee80211_handle_ht should be used only after legacy configuration
1052  * has been determined namely band, as ht configuration depends upon
1053  * the hardware's HT abilities for a _specific_ band.
1054  */
1055 u32 ieee80211_handle_ht(struct ieee80211_local *local, int enable_ht,
1056 			   struct ieee80211_ht_info *req_ht_cap,
1057 			   struct ieee80211_ht_bss_info *req_bss_cap)
1058 {
1059 	struct ieee80211_conf *conf = &local->hw.conf;
1060 	struct ieee80211_supported_band *sband;
1061 	struct ieee80211_ht_info ht_conf;
1062 	struct ieee80211_ht_bss_info ht_bss_conf;
1063 	u32 changed = 0;
1064 	int i;
1065 	u8 max_tx_streams = IEEE80211_HT_CAP_MAX_STREAMS;
1066 	u8 tx_mcs_set_cap;
1067 
1068 	sband = local->hw.wiphy->bands[conf->channel->band];
1069 
1070 	memset(&ht_conf, 0, sizeof(struct ieee80211_ht_info));
1071 	memset(&ht_bss_conf, 0, sizeof(struct ieee80211_ht_bss_info));
1072 
1073 	/* HT is not supported */
1074 	if (!sband->ht_info.ht_supported) {
1075 		conf->flags &= ~IEEE80211_CONF_SUPPORT_HT_MODE;
1076 		goto out;
1077 	}
1078 
1079 	/* disable HT */
1080 	if (!enable_ht) {
1081 		if (conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE)
1082 			changed |= BSS_CHANGED_HT;
1083 		conf->flags &= ~IEEE80211_CONF_SUPPORT_HT_MODE;
1084 		conf->ht_conf.ht_supported = 0;
1085 		goto out;
1086 	}
1087 
1088 
1089 	if (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE))
1090 		changed |= BSS_CHANGED_HT;
1091 
1092 	conf->flags |= IEEE80211_CONF_SUPPORT_HT_MODE;
1093 	ht_conf.ht_supported = 1;
1094 
1095 	ht_conf.cap = req_ht_cap->cap & sband->ht_info.cap;
1096 	ht_conf.cap &= ~(IEEE80211_HT_CAP_MIMO_PS);
1097 	ht_conf.cap |= sband->ht_info.cap & IEEE80211_HT_CAP_MIMO_PS;
1098 	ht_bss_conf.primary_channel = req_bss_cap->primary_channel;
1099 	ht_bss_conf.bss_cap = req_bss_cap->bss_cap;
1100 	ht_bss_conf.bss_op_mode = req_bss_cap->bss_op_mode;
1101 
1102 	ht_conf.ampdu_factor = req_ht_cap->ampdu_factor;
1103 	ht_conf.ampdu_density = req_ht_cap->ampdu_density;
1104 
1105 	/* Bits 96-100 */
1106 	tx_mcs_set_cap = sband->ht_info.supp_mcs_set[12];
1107 
1108 	/* configure suppoerted Tx MCS according to requested MCS
1109 	 * (based in most cases on Rx capabilities of peer) and self
1110 	 * Tx MCS capabilities (as defined by low level driver HW
1111 	 * Tx capabilities) */
1112 	if (!(tx_mcs_set_cap & IEEE80211_HT_CAP_MCS_TX_DEFINED))
1113 		goto check_changed;
1114 
1115 	/* Counting from 0 therfore + 1 */
1116 	if (tx_mcs_set_cap & IEEE80211_HT_CAP_MCS_TX_RX_DIFF)
1117 		max_tx_streams = ((tx_mcs_set_cap &
1118 				IEEE80211_HT_CAP_MCS_TX_STREAMS) >> 2) + 1;
1119 
1120 	for (i = 0; i < max_tx_streams; i++)
1121 		ht_conf.supp_mcs_set[i] =
1122 			sband->ht_info.supp_mcs_set[i] &
1123 					req_ht_cap->supp_mcs_set[i];
1124 
1125 	if (tx_mcs_set_cap & IEEE80211_HT_CAP_MCS_TX_UEQM)
1126 		for (i = IEEE80211_SUPP_MCS_SET_UEQM;
1127 		     i < IEEE80211_SUPP_MCS_SET_LEN; 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 check_changed:
1133 	/* if bss configuration changed store the new one */
1134 	if (memcmp(&conf->ht_conf, &ht_conf, sizeof(ht_conf)) ||
1135 	    memcmp(&conf->ht_bss_conf, &ht_bss_conf, sizeof(ht_bss_conf))) {
1136 		changed |= BSS_CHANGED_HT;
1137 		memcpy(&conf->ht_conf, &ht_conf, sizeof(ht_conf));
1138 		memcpy(&conf->ht_bss_conf, &ht_bss_conf, sizeof(ht_bss_conf));
1139 	}
1140 out:
1141 	return changed;
1142 }
1143 
1144 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
1145 				      u32 changed)
1146 {
1147 	struct ieee80211_local *local = sdata->local;
1148 
1149 	if (!changed)
1150 		return;
1151 
1152 	if (local->ops->bss_info_changed)
1153 		local->ops->bss_info_changed(local_to_hw(local),
1154 					     &sdata->vif,
1155 					     &sdata->bss_conf,
1156 					     changed);
1157 }
1158 
1159 u32 ieee80211_reset_erp_info(struct net_device *dev)
1160 {
1161 	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1162 
1163 	sdata->bss_conf.use_cts_prot = 0;
1164 	sdata->bss_conf.use_short_preamble = 0;
1165 	return BSS_CHANGED_ERP_CTS_PROT | BSS_CHANGED_ERP_PREAMBLE;
1166 }
1167 
1168 void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
1169 				 struct sk_buff *skb)
1170 {
1171 	struct ieee80211_local *local = hw_to_local(hw);
1172 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1173 	int tmp;
1174 
1175 	skb->dev = local->mdev;
1176 	skb->pkt_type = IEEE80211_TX_STATUS_MSG;
1177 	skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ?
1178 		       &local->skb_queue : &local->skb_queue_unreliable, skb);
1179 	tmp = skb_queue_len(&local->skb_queue) +
1180 		skb_queue_len(&local->skb_queue_unreliable);
1181 	while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
1182 	       (skb = skb_dequeue(&local->skb_queue_unreliable))) {
1183 		dev_kfree_skb_irq(skb);
1184 		tmp--;
1185 		I802_DEBUG_INC(local->tx_status_drop);
1186 	}
1187 	tasklet_schedule(&local->tasklet);
1188 }
1189 EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
1190 
1191 static void ieee80211_tasklet_handler(unsigned long data)
1192 {
1193 	struct ieee80211_local *local = (struct ieee80211_local *) data;
1194 	struct sk_buff *skb;
1195 	struct ieee80211_rx_status rx_status;
1196 	struct ieee80211_ra_tid *ra_tid;
1197 
1198 	while ((skb = skb_dequeue(&local->skb_queue)) ||
1199 	       (skb = skb_dequeue(&local->skb_queue_unreliable))) {
1200 		switch (skb->pkt_type) {
1201 		case IEEE80211_RX_MSG:
1202 			/* status is in skb->cb */
1203 			memcpy(&rx_status, skb->cb, sizeof(rx_status));
1204 			/* Clear skb->pkt_type in order to not confuse kernel
1205 			 * netstack. */
1206 			skb->pkt_type = 0;
1207 			__ieee80211_rx(local_to_hw(local), skb, &rx_status);
1208 			break;
1209 		case IEEE80211_TX_STATUS_MSG:
1210 			skb->pkt_type = 0;
1211 			ieee80211_tx_status(local_to_hw(local), skb);
1212 			break;
1213 		case IEEE80211_DELBA_MSG:
1214 			ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
1215 			ieee80211_stop_tx_ba_cb(local_to_hw(local),
1216 						ra_tid->ra, ra_tid->tid);
1217 			dev_kfree_skb(skb);
1218 			break;
1219 		case IEEE80211_ADDBA_MSG:
1220 			ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
1221 			ieee80211_start_tx_ba_cb(local_to_hw(local),
1222 						 ra_tid->ra, ra_tid->tid);
1223 			dev_kfree_skb(skb);
1224 			break ;
1225 		default:
1226 			WARN_ON(1);
1227 			dev_kfree_skb(skb);
1228 			break;
1229 		}
1230 	}
1231 }
1232 
1233 /* Remove added headers (e.g., QoS control), encryption header/MIC, etc. to
1234  * make a prepared TX frame (one that has been given to hw) to look like brand
1235  * new IEEE 802.11 frame that is ready to go through TX processing again.
1236  * Also, tx_packet_data in cb is restored from tx_control. */
1237 static void ieee80211_remove_tx_extra(struct ieee80211_local *local,
1238 				      struct ieee80211_key *key,
1239 				      struct sk_buff *skb)
1240 {
1241 	int hdrlen, iv_len, mic_len;
1242 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1243 
1244 	info->flags &=	IEEE80211_TX_CTL_REQ_TX_STATUS |
1245 			IEEE80211_TX_CTL_DO_NOT_ENCRYPT |
1246 			IEEE80211_TX_CTL_REQUEUE |
1247 			IEEE80211_TX_CTL_EAPOL_FRAME;
1248 
1249 	hdrlen = ieee80211_get_hdrlen_from_skb(skb);
1250 
1251 	if (!key)
1252 		goto no_key;
1253 
1254 	switch (key->conf.alg) {
1255 	case ALG_WEP:
1256 		iv_len = WEP_IV_LEN;
1257 		mic_len = WEP_ICV_LEN;
1258 		break;
1259 	case ALG_TKIP:
1260 		iv_len = TKIP_IV_LEN;
1261 		mic_len = TKIP_ICV_LEN;
1262 		break;
1263 	case ALG_CCMP:
1264 		iv_len = CCMP_HDR_LEN;
1265 		mic_len = CCMP_MIC_LEN;
1266 		break;
1267 	default:
1268 		goto no_key;
1269 	}
1270 
1271 	if (skb->len >= mic_len &&
1272 	    !(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
1273 		skb_trim(skb, skb->len - mic_len);
1274 	if (skb->len >= iv_len && skb->len > hdrlen) {
1275 		memmove(skb->data + iv_len, skb->data, hdrlen);
1276 		skb_pull(skb, iv_len);
1277 	}
1278 
1279 no_key:
1280 	{
1281 		struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1282 		u16 fc = le16_to_cpu(hdr->frame_control);
1283 		if ((fc & 0x8C) == 0x88) /* QoS Control Field */ {
1284 			fc &= ~IEEE80211_STYPE_QOS_DATA;
1285 			hdr->frame_control = cpu_to_le16(fc);
1286 			memmove(skb->data + 2, skb->data, hdrlen - 2);
1287 			skb_pull(skb, 2);
1288 		}
1289 	}
1290 }
1291 
1292 static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
1293 					    struct sta_info *sta,
1294 					    struct sk_buff *skb)
1295 {
1296 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1297 
1298 	sta->tx_filtered_count++;
1299 
1300 	/*
1301 	 * Clear the TX filter mask for this STA when sending the next
1302 	 * packet. If the STA went to power save mode, this will happen
1303 	 * when it wakes up for the next time.
1304 	 */
1305 	set_sta_flags(sta, WLAN_STA_CLEAR_PS_FILT);
1306 
1307 	/*
1308 	 * This code races in the following way:
1309 	 *
1310 	 *  (1) STA sends frame indicating it will go to sleep and does so
1311 	 *  (2) hardware/firmware adds STA to filter list, passes frame up
1312 	 *  (3) hardware/firmware processes TX fifo and suppresses a frame
1313 	 *  (4) we get TX status before having processed the frame and
1314 	 *	knowing that the STA has gone to sleep.
1315 	 *
1316 	 * This is actually quite unlikely even when both those events are
1317 	 * processed from interrupts coming in quickly after one another or
1318 	 * even at the same time because we queue both TX status events and
1319 	 * RX frames to be processed by a tasklet and process them in the
1320 	 * same order that they were received or TX status last. Hence, there
1321 	 * is no race as long as the frame RX is processed before the next TX
1322 	 * status, which drivers can ensure, see below.
1323 	 *
1324 	 * Note that this can only happen if the hardware or firmware can
1325 	 * actually add STAs to the filter list, if this is done by the
1326 	 * driver in response to set_tim() (which will only reduce the race
1327 	 * this whole filtering tries to solve, not completely solve it)
1328 	 * this situation cannot happen.
1329 	 *
1330 	 * To completely solve this race drivers need to make sure that they
1331 	 *  (a) don't mix the irq-safe/not irq-safe TX status/RX processing
1332 	 *	functions and
1333 	 *  (b) always process RX events before TX status events if ordering
1334 	 *      can be unknown, for example with different interrupt status
1335 	 *	bits.
1336 	 */
1337 	if (test_sta_flags(sta, WLAN_STA_PS) &&
1338 	    skb_queue_len(&sta->tx_filtered) < STA_MAX_TX_BUFFER) {
1339 		ieee80211_remove_tx_extra(local, sta->key, skb);
1340 		skb_queue_tail(&sta->tx_filtered, skb);
1341 		return;
1342 	}
1343 
1344 	if (!test_sta_flags(sta, WLAN_STA_PS) &&
1345 	    !(info->flags & IEEE80211_TX_CTL_REQUEUE)) {
1346 		/* Software retry the packet once */
1347 		info->flags |= IEEE80211_TX_CTL_REQUEUE;
1348 		ieee80211_remove_tx_extra(local, sta->key, skb);
1349 		dev_queue_xmit(skb);
1350 		return;
1351 	}
1352 
1353 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1354 	if (net_ratelimit())
1355 		printk(KERN_DEBUG "%s: dropped TX filtered frame, "
1356 		       "queue_len=%d PS=%d @%lu\n",
1357 		       wiphy_name(local->hw.wiphy),
1358 		       skb_queue_len(&sta->tx_filtered),
1359 		       !!test_sta_flags(sta, WLAN_STA_PS), jiffies);
1360 #endif
1361 	dev_kfree_skb(skb);
1362 }
1363 
1364 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
1365 {
1366 	struct sk_buff *skb2;
1367 	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1368 	struct ieee80211_local *local = hw_to_local(hw);
1369 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1370 	u16 frag, type;
1371 	__le16 fc;
1372 	struct ieee80211_tx_status_rtap_hdr *rthdr;
1373 	struct ieee80211_sub_if_data *sdata;
1374 	struct net_device *prev_dev = NULL;
1375 	struct sta_info *sta;
1376 
1377 	rcu_read_lock();
1378 
1379 	if (info->status.excessive_retries) {
1380 		sta = sta_info_get(local, hdr->addr1);
1381 		if (sta) {
1382 			if (test_sta_flags(sta, WLAN_STA_PS)) {
1383 				/*
1384 				 * The STA is in power save mode, so assume
1385 				 * that this TX packet failed because of that.
1386 				 */
1387 				ieee80211_handle_filtered_frame(local, sta, skb);
1388 				rcu_read_unlock();
1389 				return;
1390 			}
1391 		}
1392 	}
1393 
1394 	fc = hdr->frame_control;
1395 
1396 	if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
1397 	    (ieee80211_is_data_qos(fc))) {
1398 		u16 tid, ssn;
1399 		u8 *qc;
1400 		sta = sta_info_get(local, hdr->addr1);
1401 		if (sta) {
1402 			qc = ieee80211_get_qos_ctl(hdr);
1403 			tid = qc[0] & 0xf;
1404 			ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
1405 						& IEEE80211_SCTL_SEQ);
1406 			ieee80211_send_bar(sta->sdata->dev, hdr->addr1,
1407 					   tid, ssn);
1408 		}
1409 	}
1410 
1411 	if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
1412 		sta = sta_info_get(local, hdr->addr1);
1413 		if (sta) {
1414 			ieee80211_handle_filtered_frame(local, sta, skb);
1415 			rcu_read_unlock();
1416 			return;
1417 		}
1418 	} else
1419 		rate_control_tx_status(local->mdev, skb);
1420 
1421 	rcu_read_unlock();
1422 
1423 	ieee80211_led_tx(local, 0);
1424 
1425 	/* SNMP counters
1426 	 * Fragments are passed to low-level drivers as separate skbs, so these
1427 	 * are actually fragments, not frames. Update frame counters only for
1428 	 * the first fragment of the frame. */
1429 
1430 	frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG;
1431 	type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE;
1432 
1433 	if (info->flags & IEEE80211_TX_STAT_ACK) {
1434 		if (frag == 0) {
1435 			local->dot11TransmittedFrameCount++;
1436 			if (is_multicast_ether_addr(hdr->addr1))
1437 				local->dot11MulticastTransmittedFrameCount++;
1438 			if (info->status.retry_count > 0)
1439 				local->dot11RetryCount++;
1440 			if (info->status.retry_count > 1)
1441 				local->dot11MultipleRetryCount++;
1442 		}
1443 
1444 		/* This counter shall be incremented for an acknowledged MPDU
1445 		 * with an individual address in the address 1 field or an MPDU
1446 		 * with a multicast address in the address 1 field of type Data
1447 		 * or Management. */
1448 		if (!is_multicast_ether_addr(hdr->addr1) ||
1449 		    type == IEEE80211_FTYPE_DATA ||
1450 		    type == IEEE80211_FTYPE_MGMT)
1451 			local->dot11TransmittedFragmentCount++;
1452 	} else {
1453 		if (frag == 0)
1454 			local->dot11FailedCount++;
1455 	}
1456 
1457 	/* this was a transmitted frame, but now we want to reuse it */
1458 	skb_orphan(skb);
1459 
1460 	/*
1461 	 * This is a bit racy but we can avoid a lot of work
1462 	 * with this test...
1463 	 */
1464 	if (!local->monitors && !local->cooked_mntrs) {
1465 		dev_kfree_skb(skb);
1466 		return;
1467 	}
1468 
1469 	/* send frame to monitor interfaces now */
1470 
1471 	if (skb_headroom(skb) < sizeof(*rthdr)) {
1472 		printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
1473 		dev_kfree_skb(skb);
1474 		return;
1475 	}
1476 
1477 	rthdr = (struct ieee80211_tx_status_rtap_hdr *)
1478 				skb_push(skb, sizeof(*rthdr));
1479 
1480 	memset(rthdr, 0, sizeof(*rthdr));
1481 	rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
1482 	rthdr->hdr.it_present =
1483 		cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
1484 			    (1 << IEEE80211_RADIOTAP_DATA_RETRIES));
1485 
1486 	if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
1487 	    !is_multicast_ether_addr(hdr->addr1))
1488 		rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL);
1489 
1490 	if ((info->flags & IEEE80211_TX_CTL_USE_RTS_CTS) &&
1491 	    (info->flags & IEEE80211_TX_CTL_USE_CTS_PROTECT))
1492 		rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS);
1493 	else if (info->flags & IEEE80211_TX_CTL_USE_RTS_CTS)
1494 		rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS);
1495 
1496 	rthdr->data_retries = info->status.retry_count;
1497 
1498 	/* XXX: is this sufficient for BPF? */
1499 	skb_set_mac_header(skb, 0);
1500 	skb->ip_summed = CHECKSUM_UNNECESSARY;
1501 	skb->pkt_type = PACKET_OTHERHOST;
1502 	skb->protocol = htons(ETH_P_802_2);
1503 	memset(skb->cb, 0, sizeof(skb->cb));
1504 
1505 	rcu_read_lock();
1506 	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
1507 		if (sdata->vif.type == IEEE80211_IF_TYPE_MNTR) {
1508 			if (!netif_running(sdata->dev))
1509 				continue;
1510 
1511 			if (prev_dev) {
1512 				skb2 = skb_clone(skb, GFP_ATOMIC);
1513 				if (skb2) {
1514 					skb2->dev = prev_dev;
1515 					netif_rx(skb2);
1516 				}
1517 			}
1518 
1519 			prev_dev = sdata->dev;
1520 		}
1521 	}
1522 	if (prev_dev) {
1523 		skb->dev = prev_dev;
1524 		netif_rx(skb);
1525 		skb = NULL;
1526 	}
1527 	rcu_read_unlock();
1528 	dev_kfree_skb(skb);
1529 }
1530 EXPORT_SYMBOL(ieee80211_tx_status);
1531 
1532 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
1533 					const struct ieee80211_ops *ops)
1534 {
1535 	struct ieee80211_local *local;
1536 	int priv_size;
1537 	struct wiphy *wiphy;
1538 
1539 	/* Ensure 32-byte alignment of our private data and hw private data.
1540 	 * We use the wiphy priv data for both our ieee80211_local and for
1541 	 * the driver's private data
1542 	 *
1543 	 * In memory it'll be like this:
1544 	 *
1545 	 * +-------------------------+
1546 	 * | struct wiphy	    |
1547 	 * +-------------------------+
1548 	 * | struct ieee80211_local  |
1549 	 * +-------------------------+
1550 	 * | driver's private data   |
1551 	 * +-------------------------+
1552 	 *
1553 	 */
1554 	priv_size = ((sizeof(struct ieee80211_local) +
1555 		      NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST) +
1556 		    priv_data_len;
1557 
1558 	wiphy = wiphy_new(&mac80211_config_ops, priv_size);
1559 
1560 	if (!wiphy)
1561 		return NULL;
1562 
1563 	wiphy->privid = mac80211_wiphy_privid;
1564 
1565 	local = wiphy_priv(wiphy);
1566 	local->hw.wiphy = wiphy;
1567 
1568 	local->hw.priv = (char *)local +
1569 			 ((sizeof(struct ieee80211_local) +
1570 			   NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);
1571 
1572 	BUG_ON(!ops->tx);
1573 	BUG_ON(!ops->start);
1574 	BUG_ON(!ops->stop);
1575 	BUG_ON(!ops->config);
1576 	BUG_ON(!ops->add_interface);
1577 	BUG_ON(!ops->remove_interface);
1578 	BUG_ON(!ops->configure_filter);
1579 	local->ops = ops;
1580 
1581 	local->hw.queues = 1; /* default */
1582 
1583 	local->bridge_packets = 1;
1584 
1585 	local->rts_threshold = IEEE80211_MAX_RTS_THRESHOLD;
1586 	local->fragmentation_threshold = IEEE80211_MAX_FRAG_THRESHOLD;
1587 	local->short_retry_limit = 7;
1588 	local->long_retry_limit = 4;
1589 	local->hw.conf.radio_enabled = 1;
1590 
1591 	INIT_LIST_HEAD(&local->interfaces);
1592 
1593 	spin_lock_init(&local->key_lock);
1594 
1595 	INIT_DELAYED_WORK(&local->scan_work, ieee80211_sta_scan_work);
1596 
1597 	sta_info_init(local);
1598 
1599 	tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
1600 		     (unsigned long)local);
1601 	tasklet_disable(&local->tx_pending_tasklet);
1602 
1603 	tasklet_init(&local->tasklet,
1604 		     ieee80211_tasklet_handler,
1605 		     (unsigned long) local);
1606 	tasklet_disable(&local->tasklet);
1607 
1608 	skb_queue_head_init(&local->skb_queue);
1609 	skb_queue_head_init(&local->skb_queue_unreliable);
1610 
1611 	return local_to_hw(local);
1612 }
1613 EXPORT_SYMBOL(ieee80211_alloc_hw);
1614 
1615 int ieee80211_register_hw(struct ieee80211_hw *hw)
1616 {
1617 	struct ieee80211_local *local = hw_to_local(hw);
1618 	const char *name;
1619 	int result;
1620 	enum ieee80211_band band;
1621 	struct net_device *mdev;
1622 	struct wireless_dev *mwdev;
1623 
1624 	/*
1625 	 * generic code guarantees at least one band,
1626 	 * set this very early because much code assumes
1627 	 * that hw.conf.channel is assigned
1628 	 */
1629 	for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1630 		struct ieee80211_supported_band *sband;
1631 
1632 		sband = local->hw.wiphy->bands[band];
1633 		if (sband) {
1634 			/* init channel we're on */
1635 			local->hw.conf.channel =
1636 			local->oper_channel =
1637 			local->scan_channel = &sband->channels[0];
1638 			break;
1639 		}
1640 	}
1641 
1642 	result = wiphy_register(local->hw.wiphy);
1643 	if (result < 0)
1644 		return result;
1645 
1646 	/*
1647 	 * We use the number of queues for feature tests (QoS, HT) internally
1648 	 * so restrict them appropriately.
1649 	 */
1650 	if (hw->queues > IEEE80211_MAX_QUEUES)
1651 		hw->queues = IEEE80211_MAX_QUEUES;
1652 	if (hw->ampdu_queues > IEEE80211_MAX_AMPDU_QUEUES)
1653 		hw->ampdu_queues = IEEE80211_MAX_AMPDU_QUEUES;
1654 	if (hw->queues < 4)
1655 		hw->ampdu_queues = 0;
1656 
1657 	mdev = alloc_netdev_mq(sizeof(struct wireless_dev),
1658 			       "wmaster%d", ether_setup,
1659 			       ieee80211_num_queues(hw));
1660 	if (!mdev)
1661 		goto fail_mdev_alloc;
1662 
1663 	mwdev = netdev_priv(mdev);
1664 	mdev->ieee80211_ptr = mwdev;
1665 	mwdev->wiphy = local->hw.wiphy;
1666 
1667 	local->mdev = mdev;
1668 
1669 	ieee80211_rx_bss_list_init(local);
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 	name = wiphy_dev(local->hw.wiphy)->driver->name;
1679 	local->hw.workqueue = create_freezeable_workqueue(name);
1680 	if (!local->hw.workqueue) {
1681 		result = -ENOMEM;
1682 		goto fail_workqueue;
1683 	}
1684 
1685 	/*
1686 	 * The hardware needs headroom for sending the frame,
1687 	 * and we need some headroom for passing the frame to monitor
1688 	 * interfaces, but never both at the same time.
1689 	 */
1690 	local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
1691 				   sizeof(struct ieee80211_tx_status_rtap_hdr));
1692 
1693 	debugfs_hw_add(local);
1694 
1695 	if (local->hw.conf.beacon_int < 10)
1696 		local->hw.conf.beacon_int = 100;
1697 
1698 	local->wstats_flags |= local->hw.flags & (IEEE80211_HW_SIGNAL_UNSPEC |
1699 						  IEEE80211_HW_SIGNAL_DB |
1700 						  IEEE80211_HW_SIGNAL_DBM) ?
1701 			       IW_QUAL_QUAL_UPDATED : IW_QUAL_QUAL_INVALID;
1702 	local->wstats_flags |= local->hw.flags & IEEE80211_HW_NOISE_DBM ?
1703 			       IW_QUAL_NOISE_UPDATED : IW_QUAL_NOISE_INVALID;
1704 	if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
1705 		local->wstats_flags |= IW_QUAL_DBM;
1706 
1707 	result = sta_info_start(local);
1708 	if (result < 0)
1709 		goto fail_sta_info;
1710 
1711 	rtnl_lock();
1712 	result = dev_alloc_name(local->mdev, local->mdev->name);
1713 	if (result < 0)
1714 		goto fail_dev;
1715 
1716 	memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1717 	SET_NETDEV_DEV(local->mdev, wiphy_dev(local->hw.wiphy));
1718 
1719 	result = register_netdevice(local->mdev);
1720 	if (result < 0)
1721 		goto fail_dev;
1722 
1723 	result = ieee80211_init_rate_ctrl_alg(local,
1724 					      hw->rate_control_algorithm);
1725 	if (result < 0) {
1726 		printk(KERN_DEBUG "%s: Failed to initialize rate control "
1727 		       "algorithm\n", wiphy_name(local->hw.wiphy));
1728 		goto fail_rate;
1729 	}
1730 
1731 	result = ieee80211_wep_init(local);
1732 
1733 	if (result < 0) {
1734 		printk(KERN_DEBUG "%s: Failed to initialize wep\n",
1735 		       wiphy_name(local->hw.wiphy));
1736 		goto fail_wep;
1737 	}
1738 
1739 	local->mdev->select_queue = ieee80211_select_queue;
1740 
1741 	/* add one default STA interface */
1742 	result = ieee80211_if_add(local, "wlan%d", NULL,
1743 				  IEEE80211_IF_TYPE_STA, NULL);
1744 	if (result)
1745 		printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
1746 		       wiphy_name(local->hw.wiphy));
1747 
1748 	rtnl_unlock();
1749 
1750 	ieee80211_led_init(local);
1751 
1752 	return 0;
1753 
1754 fail_wep:
1755 	rate_control_deinitialize(local);
1756 fail_rate:
1757 	unregister_netdevice(local->mdev);
1758 	local->mdev = NULL;
1759 fail_dev:
1760 	rtnl_unlock();
1761 	sta_info_stop(local);
1762 fail_sta_info:
1763 	debugfs_hw_del(local);
1764 	destroy_workqueue(local->hw.workqueue);
1765 fail_workqueue:
1766 	if (local->mdev)
1767 		free_netdev(local->mdev);
1768 fail_mdev_alloc:
1769 	wiphy_unregister(local->hw.wiphy);
1770 	return result;
1771 }
1772 EXPORT_SYMBOL(ieee80211_register_hw);
1773 
1774 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
1775 {
1776 	struct ieee80211_local *local = hw_to_local(hw);
1777 
1778 	tasklet_kill(&local->tx_pending_tasklet);
1779 	tasklet_kill(&local->tasklet);
1780 
1781 	rtnl_lock();
1782 
1783 	/*
1784 	 * At this point, interface list manipulations are fine
1785 	 * because the driver cannot be handing us frames any
1786 	 * more and the tasklet is killed.
1787 	 */
1788 
1789 	/* First, we remove all virtual interfaces. */
1790 	ieee80211_remove_interfaces(local);
1791 
1792 	/* then, finally, remove the master interface */
1793 	unregister_netdevice(local->mdev);
1794 
1795 	rtnl_unlock();
1796 
1797 	ieee80211_rx_bss_list_deinit(local);
1798 	ieee80211_clear_tx_pending(local);
1799 	sta_info_stop(local);
1800 	rate_control_deinitialize(local);
1801 	debugfs_hw_del(local);
1802 
1803 	if (skb_queue_len(&local->skb_queue)
1804 			|| skb_queue_len(&local->skb_queue_unreliable))
1805 		printk(KERN_WARNING "%s: skb_queue not empty\n",
1806 		       wiphy_name(local->hw.wiphy));
1807 	skb_queue_purge(&local->skb_queue);
1808 	skb_queue_purge(&local->skb_queue_unreliable);
1809 
1810 	destroy_workqueue(local->hw.workqueue);
1811 	wiphy_unregister(local->hw.wiphy);
1812 	ieee80211_wep_free(local);
1813 	ieee80211_led_exit(local);
1814 	free_netdev(local->mdev);
1815 }
1816 EXPORT_SYMBOL(ieee80211_unregister_hw);
1817 
1818 void ieee80211_free_hw(struct ieee80211_hw *hw)
1819 {
1820 	struct ieee80211_local *local = hw_to_local(hw);
1821 
1822 	wiphy_free(local->hw.wiphy);
1823 }
1824 EXPORT_SYMBOL(ieee80211_free_hw);
1825 
1826 static int __init ieee80211_init(void)
1827 {
1828 	struct sk_buff *skb;
1829 	int ret;
1830 
1831 	BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1832 	BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1833 	             IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1834 
1835 	ret = rc80211_pid_init();
1836 	if (ret)
1837 		return ret;
1838 
1839 	ieee80211_debugfs_netdev_init();
1840 
1841 	return 0;
1842 }
1843 
1844 static void __exit ieee80211_exit(void)
1845 {
1846 	rc80211_pid_exit();
1847 
1848 	/*
1849 	 * For key todo, it'll be empty by now but the work
1850 	 * might still be scheduled.
1851 	 */
1852 	flush_scheduled_work();
1853 
1854 	if (mesh_allocated)
1855 		ieee80211s_stop();
1856 
1857 	ieee80211_debugfs_netdev_exit();
1858 }
1859 
1860 
1861 subsys_initcall(ieee80211_init);
1862 module_exit(ieee80211_exit);
1863 
1864 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1865 MODULE_LICENSE("GPL");
1866