xref: /openbmc/linux/net/mac80211/main.c (revision 7dd65feb)
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 <linux/module.h>
13 #include <linux/init.h>
14 #include <linux/netdevice.h>
15 #include <linux/types.h>
16 #include <linux/slab.h>
17 #include <linux/skbuff.h>
18 #include <linux/etherdevice.h>
19 #include <linux/if_arp.h>
20 #include <linux/wireless.h>
21 #include <linux/rtnetlink.h>
22 #include <linux/bitmap.h>
23 #include <linux/pm_qos_params.h>
24 #include <net/net_namespace.h>
25 #include <net/cfg80211.h>
26 
27 #include "ieee80211_i.h"
28 #include "driver-ops.h"
29 #include "rate.h"
30 #include "mesh.h"
31 #include "wep.h"
32 #include "led.h"
33 #include "cfg.h"
34 #include "debugfs.h"
35 #include "debugfs_netdev.h"
36 
37 void ieee80211_configure_filter(struct ieee80211_local *local)
38 {
39 	u64 mc;
40 	unsigned int changed_flags;
41 	unsigned int new_flags = 0;
42 
43 	if (atomic_read(&local->iff_promiscs))
44 		new_flags |= FIF_PROMISC_IN_BSS;
45 
46 	if (atomic_read(&local->iff_allmultis))
47 		new_flags |= FIF_ALLMULTI;
48 
49 	if (local->monitors || local->scanning)
50 		new_flags |= FIF_BCN_PRBRESP_PROMISC;
51 
52 	if (local->fif_fcsfail)
53 		new_flags |= FIF_FCSFAIL;
54 
55 	if (local->fif_plcpfail)
56 		new_flags |= FIF_PLCPFAIL;
57 
58 	if (local->fif_control)
59 		new_flags |= FIF_CONTROL;
60 
61 	if (local->fif_other_bss)
62 		new_flags |= FIF_OTHER_BSS;
63 
64 	if (local->fif_pspoll)
65 		new_flags |= FIF_PSPOLL;
66 
67 	spin_lock_bh(&local->filter_lock);
68 	changed_flags = local->filter_flags ^ new_flags;
69 
70 	mc = drv_prepare_multicast(local, local->mc_count, local->mc_list);
71 	spin_unlock_bh(&local->filter_lock);
72 
73 	/* be a bit nasty */
74 	new_flags |= (1<<31);
75 
76 	drv_configure_filter(local, changed_flags, &new_flags, mc);
77 
78 	WARN_ON(new_flags & (1<<31));
79 
80 	local->filter_flags = new_flags & ~(1<<31);
81 }
82 
83 static void ieee80211_reconfig_filter(struct work_struct *work)
84 {
85 	struct ieee80211_local *local =
86 		container_of(work, struct ieee80211_local, reconfig_filter);
87 
88 	ieee80211_configure_filter(local);
89 }
90 
91 int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
92 {
93 	struct ieee80211_channel *chan, *scan_chan;
94 	int ret = 0;
95 	int power;
96 	enum nl80211_channel_type channel_type;
97 
98 	might_sleep();
99 
100 	scan_chan = local->scan_channel;
101 
102 	if (scan_chan) {
103 		chan = scan_chan;
104 		channel_type = NL80211_CHAN_NO_HT;
105 	} else {
106 		chan = local->oper_channel;
107 		channel_type = local->oper_channel_type;
108 	}
109 
110 	if (chan != local->hw.conf.channel ||
111 	    channel_type != local->hw.conf.channel_type) {
112 		local->hw.conf.channel = chan;
113 		local->hw.conf.channel_type = channel_type;
114 		changed |= IEEE80211_CONF_CHANGE_CHANNEL;
115 	}
116 
117 	if (scan_chan)
118 		power = chan->max_power;
119 	else
120 		power = local->power_constr_level ?
121 			(chan->max_power - local->power_constr_level) :
122 			chan->max_power;
123 
124 	if (local->user_power_level >= 0)
125 		power = min(power, local->user_power_level);
126 
127 	if (local->hw.conf.power_level != power) {
128 		changed |= IEEE80211_CONF_CHANGE_POWER;
129 		local->hw.conf.power_level = power;
130 	}
131 
132 	if (changed && local->open_count) {
133 		ret = drv_config(local, changed);
134 		/*
135 		 * Goal:
136 		 * HW reconfiguration should never fail, the driver has told
137 		 * us what it can support so it should live up to that promise.
138 		 *
139 		 * Current status:
140 		 * rfkill is not integrated with mac80211 and a
141 		 * configuration command can thus fail if hardware rfkill
142 		 * is enabled
143 		 *
144 		 * FIXME: integrate rfkill with mac80211 and then add this
145 		 * WARN_ON() back
146 		 *
147 		 */
148 		/* WARN_ON(ret); */
149 	}
150 
151 	return ret;
152 }
153 
154 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
155 				      u32 changed)
156 {
157 	struct ieee80211_local *local = sdata->local;
158 	static const u8 zero[ETH_ALEN] = { 0 };
159 
160 	if (!changed)
161 		return;
162 
163 	if (sdata->vif.type == NL80211_IFTYPE_STATION) {
164 		/*
165 		 * While not associated, claim a BSSID of all-zeroes
166 		 * so that drivers don't do any weird things with the
167 		 * BSSID at that time.
168 		 */
169 		if (sdata->vif.bss_conf.assoc)
170 			sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
171 		else
172 			sdata->vif.bss_conf.bssid = zero;
173 	} else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
174 		sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
175 	else if (sdata->vif.type == NL80211_IFTYPE_AP)
176 		sdata->vif.bss_conf.bssid = sdata->dev->dev_addr;
177 	else if (ieee80211_vif_is_mesh(&sdata->vif)) {
178 		sdata->vif.bss_conf.bssid = zero;
179 	} else {
180 		WARN_ON(1);
181 		return;
182 	}
183 
184 	switch (sdata->vif.type) {
185 	case NL80211_IFTYPE_AP:
186 	case NL80211_IFTYPE_ADHOC:
187 	case NL80211_IFTYPE_MESH_POINT:
188 		break;
189 	default:
190 		/* do not warn to simplify caller in scan.c */
191 		changed &= ~BSS_CHANGED_BEACON_ENABLED;
192 		if (WARN_ON(changed & BSS_CHANGED_BEACON))
193 			return;
194 		break;
195 	}
196 
197 	if (changed & BSS_CHANGED_BEACON_ENABLED) {
198 		if (local->quiescing || !netif_running(sdata->dev) ||
199 		    test_bit(SCAN_SW_SCANNING, &local->scanning)) {
200 			sdata->vif.bss_conf.enable_beacon = false;
201 		} else {
202 			/*
203 			 * Beacon should be enabled, but AP mode must
204 			 * check whether there is a beacon configured.
205 			 */
206 			switch (sdata->vif.type) {
207 			case NL80211_IFTYPE_AP:
208 				sdata->vif.bss_conf.enable_beacon =
209 					!!rcu_dereference(sdata->u.ap.beacon);
210 				break;
211 			case NL80211_IFTYPE_ADHOC:
212 				sdata->vif.bss_conf.enable_beacon =
213 					!!rcu_dereference(sdata->u.ibss.presp);
214 				break;
215 			case NL80211_IFTYPE_MESH_POINT:
216 				sdata->vif.bss_conf.enable_beacon = true;
217 				break;
218 			default:
219 				/* not reached */
220 				WARN_ON(1);
221 				break;
222 			}
223 		}
224 	}
225 
226 	drv_bss_info_changed(local, &sdata->vif,
227 			     &sdata->vif.bss_conf, changed);
228 }
229 
230 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
231 {
232 	sdata->vif.bss_conf.use_cts_prot = false;
233 	sdata->vif.bss_conf.use_short_preamble = false;
234 	sdata->vif.bss_conf.use_short_slot = false;
235 	return BSS_CHANGED_ERP_CTS_PROT |
236 	       BSS_CHANGED_ERP_PREAMBLE |
237 	       BSS_CHANGED_ERP_SLOT;
238 }
239 
240 static void ieee80211_tasklet_handler(unsigned long data)
241 {
242 	struct ieee80211_local *local = (struct ieee80211_local *) data;
243 	struct sk_buff *skb;
244 	struct ieee80211_ra_tid *ra_tid;
245 
246 	while ((skb = skb_dequeue(&local->skb_queue)) ||
247 	       (skb = skb_dequeue(&local->skb_queue_unreliable))) {
248 		switch (skb->pkt_type) {
249 		case IEEE80211_RX_MSG:
250 			/* Clear skb->pkt_type in order to not confuse kernel
251 			 * netstack. */
252 			skb->pkt_type = 0;
253 			ieee80211_rx(local_to_hw(local), skb);
254 			break;
255 		case IEEE80211_TX_STATUS_MSG:
256 			skb->pkt_type = 0;
257 			ieee80211_tx_status(local_to_hw(local), skb);
258 			break;
259 		case IEEE80211_DELBA_MSG:
260 			ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
261 			ieee80211_stop_tx_ba_cb(ra_tid->vif, ra_tid->ra,
262 						ra_tid->tid);
263 			dev_kfree_skb(skb);
264 			break;
265 		case IEEE80211_ADDBA_MSG:
266 			ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
267 			ieee80211_start_tx_ba_cb(ra_tid->vif, ra_tid->ra,
268 						 ra_tid->tid);
269 			dev_kfree_skb(skb);
270 			break ;
271 		default:
272 			WARN(1, "mac80211: Packet is of unknown type %d\n",
273 			     skb->pkt_type);
274 			dev_kfree_skb(skb);
275 			break;
276 		}
277 	}
278 }
279 
280 static void ieee80211_restart_work(struct work_struct *work)
281 {
282 	struct ieee80211_local *local =
283 		container_of(work, struct ieee80211_local, restart_work);
284 
285 	rtnl_lock();
286 	ieee80211_reconfig(local);
287 	rtnl_unlock();
288 }
289 
290 void ieee80211_restart_hw(struct ieee80211_hw *hw)
291 {
292 	struct ieee80211_local *local = hw_to_local(hw);
293 
294 	/* use this reason, __ieee80211_resume will unblock it */
295 	ieee80211_stop_queues_by_reason(hw,
296 		IEEE80211_QUEUE_STOP_REASON_SUSPEND);
297 
298 	schedule_work(&local->restart_work);
299 }
300 EXPORT_SYMBOL(ieee80211_restart_hw);
301 
302 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
303 					const struct ieee80211_ops *ops)
304 {
305 	struct ieee80211_local *local;
306 	int priv_size, i;
307 	struct wiphy *wiphy;
308 
309 	/* Ensure 32-byte alignment of our private data and hw private data.
310 	 * We use the wiphy priv data for both our ieee80211_local and for
311 	 * the driver's private data
312 	 *
313 	 * In memory it'll be like this:
314 	 *
315 	 * +-------------------------+
316 	 * | struct wiphy	    |
317 	 * +-------------------------+
318 	 * | struct ieee80211_local  |
319 	 * +-------------------------+
320 	 * | driver's private data   |
321 	 * +-------------------------+
322 	 *
323 	 */
324 	priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
325 
326 	wiphy = wiphy_new(&mac80211_config_ops, priv_size);
327 
328 	if (!wiphy)
329 		return NULL;
330 
331 	wiphy->flags |= WIPHY_FLAG_NETNS_OK |
332 			WIPHY_FLAG_4ADDR_AP |
333 			WIPHY_FLAG_4ADDR_STATION;
334 	wiphy->privid = mac80211_wiphy_privid;
335 
336 	/* Yes, putting cfg80211_bss into ieee80211_bss is a hack */
337 	wiphy->bss_priv_size = sizeof(struct ieee80211_bss) -
338 			       sizeof(struct cfg80211_bss);
339 
340 	local = wiphy_priv(wiphy);
341 
342 	local->hw.wiphy = wiphy;
343 
344 	local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
345 
346 	BUG_ON(!ops->tx);
347 	BUG_ON(!ops->start);
348 	BUG_ON(!ops->stop);
349 	BUG_ON(!ops->config);
350 	BUG_ON(!ops->add_interface);
351 	BUG_ON(!ops->remove_interface);
352 	BUG_ON(!ops->configure_filter);
353 	local->ops = ops;
354 
355 	/* set up some defaults */
356 	local->hw.queues = 1;
357 	local->hw.max_rates = 1;
358 	local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
359 	local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
360 	local->user_power_level = -1;
361 
362 	INIT_LIST_HEAD(&local->interfaces);
363 	mutex_init(&local->iflist_mtx);
364 	mutex_init(&local->scan_mtx);
365 
366 	spin_lock_init(&local->key_lock);
367 	spin_lock_init(&local->filter_lock);
368 	spin_lock_init(&local->queue_stop_reason_lock);
369 
370 	INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
371 
372 	INIT_WORK(&local->restart_work, ieee80211_restart_work);
373 
374 	INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter);
375 
376 	INIT_WORK(&local->dynamic_ps_enable_work,
377 		  ieee80211_dynamic_ps_enable_work);
378 	INIT_WORK(&local->dynamic_ps_disable_work,
379 		  ieee80211_dynamic_ps_disable_work);
380 	setup_timer(&local->dynamic_ps_timer,
381 		    ieee80211_dynamic_ps_timer, (unsigned long) local);
382 
383 	sta_info_init(local);
384 
385 	for (i = 0; i < IEEE80211_MAX_QUEUES; i++)
386 		skb_queue_head_init(&local->pending[i]);
387 	tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
388 		     (unsigned long)local);
389 
390 	tasklet_init(&local->tasklet,
391 		     ieee80211_tasklet_handler,
392 		     (unsigned long) local);
393 
394 	skb_queue_head_init(&local->skb_queue);
395 	skb_queue_head_init(&local->skb_queue_unreliable);
396 
397 	spin_lock_init(&local->ampdu_lock);
398 
399 	return local_to_hw(local);
400 }
401 EXPORT_SYMBOL(ieee80211_alloc_hw);
402 
403 int ieee80211_register_hw(struct ieee80211_hw *hw)
404 {
405 	struct ieee80211_local *local = hw_to_local(hw);
406 	int result;
407 	enum ieee80211_band band;
408 	int channels, i, j, max_bitrates;
409 	bool supp_ht;
410 	static const u32 cipher_suites[] = {
411 		WLAN_CIPHER_SUITE_WEP40,
412 		WLAN_CIPHER_SUITE_WEP104,
413 		WLAN_CIPHER_SUITE_TKIP,
414 		WLAN_CIPHER_SUITE_CCMP,
415 
416 		/* keep last -- depends on hw flags! */
417 		WLAN_CIPHER_SUITE_AES_CMAC
418 	};
419 
420 	/*
421 	 * generic code guarantees at least one band,
422 	 * set this very early because much code assumes
423 	 * that hw.conf.channel is assigned
424 	 */
425 	channels = 0;
426 	max_bitrates = 0;
427 	supp_ht = false;
428 	for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
429 		struct ieee80211_supported_band *sband;
430 
431 		sband = local->hw.wiphy->bands[band];
432 		if (!sband)
433 			continue;
434 		if (!local->oper_channel) {
435 			/* init channel we're on */
436 			local->hw.conf.channel =
437 			local->oper_channel = &sband->channels[0];
438 			local->hw.conf.channel_type = NL80211_CHAN_NO_HT;
439 		}
440 		channels += sband->n_channels;
441 
442 		if (max_bitrates < sband->n_bitrates)
443 			max_bitrates = sband->n_bitrates;
444 		supp_ht = supp_ht || sband->ht_cap.ht_supported;
445 	}
446 
447 	local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +
448 				      sizeof(void *) * channels, GFP_KERNEL);
449 	if (!local->int_scan_req)
450 		return -ENOMEM;
451 
452 	/* if low-level driver supports AP, we also support VLAN */
453 	if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP))
454 		local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
455 
456 	/* mac80211 always supports monitor */
457 	local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
458 
459 	if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
460 		local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
461 	else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
462 		local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
463 
464 	/*
465 	 * Calculate scan IE length -- we need this to alloc
466 	 * memory and to subtract from the driver limit. It
467 	 * includes the (extended) supported rates and HT
468 	 * information -- SSID is the driver's responsibility.
469 	 */
470 	local->scan_ies_len = 4 + max_bitrates; /* (ext) supp rates */
471 	if (supp_ht)
472 		local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
473 
474 	if (!local->ops->hw_scan) {
475 		/* For hw_scan, driver needs to set these up. */
476 		local->hw.wiphy->max_scan_ssids = 4;
477 		local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
478 	}
479 
480 	/*
481 	 * If the driver supports any scan IEs, then assume the
482 	 * limit includes the IEs mac80211 will add, otherwise
483 	 * leave it at zero and let the driver sort it out; we
484 	 * still pass our IEs to the driver but userspace will
485 	 * not be allowed to in that case.
486 	 */
487 	if (local->hw.wiphy->max_scan_ie_len)
488 		local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
489 
490 	local->hw.wiphy->cipher_suites = cipher_suites;
491 	local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
492 	if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
493 		local->hw.wiphy->n_cipher_suites--;
494 
495 	result = wiphy_register(local->hw.wiphy);
496 	if (result < 0)
497 		goto fail_wiphy_register;
498 
499 	/*
500 	 * We use the number of queues for feature tests (QoS, HT) internally
501 	 * so restrict them appropriately.
502 	 */
503 	if (hw->queues > IEEE80211_MAX_QUEUES)
504 		hw->queues = IEEE80211_MAX_QUEUES;
505 
506 	local->workqueue =
507 		create_singlethread_workqueue(wiphy_name(local->hw.wiphy));
508 	if (!local->workqueue) {
509 		result = -ENOMEM;
510 		goto fail_workqueue;
511 	}
512 
513 	/*
514 	 * The hardware needs headroom for sending the frame,
515 	 * and we need some headroom for passing the frame to monitor
516 	 * interfaces, but never both at the same time.
517 	 */
518 	BUILD_BUG_ON(IEEE80211_TX_STATUS_HEADROOM !=
519 			sizeof(struct ieee80211_tx_status_rtap_hdr));
520 	local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
521 				   sizeof(struct ieee80211_tx_status_rtap_hdr));
522 
523 	debugfs_hw_add(local);
524 
525 	if (local->hw.max_listen_interval == 0)
526 		local->hw.max_listen_interval = 1;
527 
528 	local->hw.conf.listen_interval = local->hw.max_listen_interval;
529 
530 	result = sta_info_start(local);
531 	if (result < 0)
532 		goto fail_sta_info;
533 
534 	result = ieee80211_wep_init(local);
535 	if (result < 0) {
536 		printk(KERN_DEBUG "%s: Failed to initialize wep: %d\n",
537 		       wiphy_name(local->hw.wiphy), result);
538 		goto fail_wep;
539 	}
540 
541 	rtnl_lock();
542 
543 	result = ieee80211_init_rate_ctrl_alg(local,
544 					      hw->rate_control_algorithm);
545 	if (result < 0) {
546 		printk(KERN_DEBUG "%s: Failed to initialize rate control "
547 		       "algorithm\n", wiphy_name(local->hw.wiphy));
548 		goto fail_rate;
549 	}
550 
551 	/* add one default STA interface if supported */
552 	if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
553 		result = ieee80211_if_add(local, "wlan%d", NULL,
554 					  NL80211_IFTYPE_STATION, NULL);
555 		if (result)
556 			printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
557 			       wiphy_name(local->hw.wiphy));
558 	}
559 
560 	rtnl_unlock();
561 
562 	ieee80211_led_init(local);
563 
564 	/* alloc internal scan request */
565 	i = 0;
566 	local->int_scan_req->ssids = &local->scan_ssid;
567 	local->int_scan_req->n_ssids = 1;
568 	for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
569 		if (!hw->wiphy->bands[band])
570 			continue;
571 		for (j = 0; j < hw->wiphy->bands[band]->n_channels; j++) {
572 			local->int_scan_req->channels[i] =
573 				&hw->wiphy->bands[band]->channels[j];
574 			i++;
575 		}
576 	}
577 	local->int_scan_req->n_channels = i;
578 
579 	local->network_latency_notifier.notifier_call =
580 		ieee80211_max_network_latency;
581 	result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
582 				     &local->network_latency_notifier);
583 
584 	if (result) {
585 		rtnl_lock();
586 		goto fail_pm_qos;
587 	}
588 
589 	return 0;
590 
591  fail_pm_qos:
592 	ieee80211_led_exit(local);
593 	ieee80211_remove_interfaces(local);
594  fail_rate:
595 	rtnl_unlock();
596 	ieee80211_wep_free(local);
597  fail_wep:
598 	sta_info_stop(local);
599  fail_sta_info:
600 	destroy_workqueue(local->workqueue);
601  fail_workqueue:
602 	wiphy_unregister(local->hw.wiphy);
603  fail_wiphy_register:
604 	kfree(local->int_scan_req);
605 	return result;
606 }
607 EXPORT_SYMBOL(ieee80211_register_hw);
608 
609 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
610 {
611 	struct ieee80211_local *local = hw_to_local(hw);
612 
613 	tasklet_kill(&local->tx_pending_tasklet);
614 	tasklet_kill(&local->tasklet);
615 
616 	pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
617 			       &local->network_latency_notifier);
618 
619 	rtnl_lock();
620 
621 	/*
622 	 * At this point, interface list manipulations are fine
623 	 * because the driver cannot be handing us frames any
624 	 * more and the tasklet is killed.
625 	 */
626 	ieee80211_remove_interfaces(local);
627 
628 	rtnl_unlock();
629 
630 	cancel_work_sync(&local->reconfig_filter);
631 
632 	ieee80211_clear_tx_pending(local);
633 	sta_info_stop(local);
634 	rate_control_deinitialize(local);
635 
636 	if (skb_queue_len(&local->skb_queue) ||
637 	    skb_queue_len(&local->skb_queue_unreliable))
638 		printk(KERN_WARNING "%s: skb_queue not empty\n",
639 		       wiphy_name(local->hw.wiphy));
640 	skb_queue_purge(&local->skb_queue);
641 	skb_queue_purge(&local->skb_queue_unreliable);
642 
643 	destroy_workqueue(local->workqueue);
644 	wiphy_unregister(local->hw.wiphy);
645 	ieee80211_wep_free(local);
646 	ieee80211_led_exit(local);
647 	kfree(local->int_scan_req);
648 }
649 EXPORT_SYMBOL(ieee80211_unregister_hw);
650 
651 void ieee80211_free_hw(struct ieee80211_hw *hw)
652 {
653 	struct ieee80211_local *local = hw_to_local(hw);
654 
655 	mutex_destroy(&local->iflist_mtx);
656 	mutex_destroy(&local->scan_mtx);
657 
658 	wiphy_free(local->hw.wiphy);
659 }
660 EXPORT_SYMBOL(ieee80211_free_hw);
661 
662 static int __init ieee80211_init(void)
663 {
664 	struct sk_buff *skb;
665 	int ret;
666 
667 	BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
668 	BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
669 		     IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
670 
671 	ret = rc80211_minstrel_init();
672 	if (ret)
673 		return ret;
674 
675 	ret = rc80211_pid_init();
676 	if (ret)
677 		return ret;
678 
679 	ieee80211_debugfs_netdev_init();
680 
681 	return 0;
682 }
683 
684 static void __exit ieee80211_exit(void)
685 {
686 	rc80211_pid_exit();
687 	rc80211_minstrel_exit();
688 
689 	/*
690 	 * For key todo, it'll be empty by now but the work
691 	 * might still be scheduled.
692 	 */
693 	flush_scheduled_work();
694 
695 	if (mesh_allocated)
696 		ieee80211s_stop();
697 
698 	ieee80211_debugfs_netdev_exit();
699 }
700 
701 
702 subsys_initcall(ieee80211_init);
703 module_exit(ieee80211_exit);
704 
705 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
706 MODULE_LICENSE("GPL");
707