main.c revision 4136c4224ccf1907d309e1cdfaefef9da97dbc5e
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/rtnetlink.h>
21#include <linux/bitmap.h>
22#include <linux/pm_qos_params.h>
23#include <linux/inetdevice.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
36
37bool ieee80211_disable_40mhz_24ghz;
38module_param(ieee80211_disable_40mhz_24ghz, bool, 0644);
39MODULE_PARM_DESC(ieee80211_disable_40mhz_24ghz,
40		 "Disable 40MHz support in the 2.4GHz band");
41
42void ieee80211_configure_filter(struct ieee80211_local *local)
43{
44	u64 mc;
45	unsigned int changed_flags;
46	unsigned int new_flags = 0;
47
48	if (atomic_read(&local->iff_promiscs))
49		new_flags |= FIF_PROMISC_IN_BSS;
50
51	if (atomic_read(&local->iff_allmultis))
52		new_flags |= FIF_ALLMULTI;
53
54	if (local->monitors || local->scanning)
55		new_flags |= FIF_BCN_PRBRESP_PROMISC;
56
57	if (local->fif_fcsfail)
58		new_flags |= FIF_FCSFAIL;
59
60	if (local->fif_plcpfail)
61		new_flags |= FIF_PLCPFAIL;
62
63	if (local->fif_control)
64		new_flags |= FIF_CONTROL;
65
66	if (local->fif_other_bss)
67		new_flags |= FIF_OTHER_BSS;
68
69	if (local->fif_pspoll)
70		new_flags |= FIF_PSPOLL;
71
72	spin_lock_bh(&local->filter_lock);
73	changed_flags = local->filter_flags ^ new_flags;
74
75	mc = drv_prepare_multicast(local, &local->mc_list);
76	spin_unlock_bh(&local->filter_lock);
77
78	/* be a bit nasty */
79	new_flags |= (1<<31);
80
81	drv_configure_filter(local, changed_flags, &new_flags, mc);
82
83	WARN_ON(new_flags & (1<<31));
84
85	local->filter_flags = new_flags & ~(1<<31);
86}
87
88static void ieee80211_reconfig_filter(struct work_struct *work)
89{
90	struct ieee80211_local *local =
91		container_of(work, struct ieee80211_local, reconfig_filter);
92
93	ieee80211_configure_filter(local);
94}
95
96int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
97{
98	struct ieee80211_channel *chan, *scan_chan;
99	int ret = 0;
100	int power;
101	enum nl80211_channel_type channel_type;
102	u32 offchannel_flag;
103
104	might_sleep();
105
106	scan_chan = local->scan_channel;
107
108	offchannel_flag = local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
109	if (scan_chan) {
110		chan = scan_chan;
111		channel_type = NL80211_CHAN_NO_HT;
112		local->hw.conf.flags |= IEEE80211_CONF_OFFCHANNEL;
113	} else if (local->tmp_channel &&
114		   local->oper_channel != local->tmp_channel) {
115		chan = scan_chan = local->tmp_channel;
116		channel_type = local->tmp_channel_type;
117		local->hw.conf.flags |= IEEE80211_CONF_OFFCHANNEL;
118	} else {
119		chan = local->oper_channel;
120		channel_type = local->_oper_channel_type;
121		local->hw.conf.flags &= ~IEEE80211_CONF_OFFCHANNEL;
122	}
123	offchannel_flag ^= local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
124
125	if (offchannel_flag || chan != local->hw.conf.channel ||
126	    channel_type != local->hw.conf.channel_type) {
127		local->hw.conf.channel = chan;
128		local->hw.conf.channel_type = channel_type;
129		changed |= IEEE80211_CONF_CHANGE_CHANNEL;
130	}
131
132	if (!conf_is_ht(&local->hw.conf)) {
133		/*
134		 * mac80211.h documents that this is only valid
135		 * when the channel is set to an HT type, and
136		 * that otherwise STATIC is used.
137		 */
138		local->hw.conf.smps_mode = IEEE80211_SMPS_STATIC;
139	} else if (local->hw.conf.smps_mode != local->smps_mode) {
140		local->hw.conf.smps_mode = local->smps_mode;
141		changed |= IEEE80211_CONF_CHANGE_SMPS;
142	}
143
144	if (scan_chan)
145		power = chan->max_power;
146	else
147		power = local->power_constr_level ?
148			(chan->max_power - local->power_constr_level) :
149			chan->max_power;
150
151	if (local->user_power_level >= 0)
152		power = min(power, local->user_power_level);
153
154	if (local->hw.conf.power_level != power) {
155		changed |= IEEE80211_CONF_CHANGE_POWER;
156		local->hw.conf.power_level = power;
157	}
158
159	if (changed && local->open_count) {
160		ret = drv_config(local, changed);
161		/*
162		 * Goal:
163		 * HW reconfiguration should never fail, the driver has told
164		 * us what it can support so it should live up to that promise.
165		 *
166		 * Current status:
167		 * rfkill is not integrated with mac80211 and a
168		 * configuration command can thus fail if hardware rfkill
169		 * is enabled
170		 *
171		 * FIXME: integrate rfkill with mac80211 and then add this
172		 * WARN_ON() back
173		 *
174		 */
175		/* WARN_ON(ret); */
176	}
177
178	return ret;
179}
180
181void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
182				      u32 changed)
183{
184	struct ieee80211_local *local = sdata->local;
185	static const u8 zero[ETH_ALEN] = { 0 };
186
187	if (!changed)
188		return;
189
190	if (sdata->vif.type == NL80211_IFTYPE_STATION) {
191		/*
192		 * While not associated, claim a BSSID of all-zeroes
193		 * so that drivers don't do any weird things with the
194		 * BSSID at that time.
195		 */
196		if (sdata->vif.bss_conf.assoc)
197			sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
198		else
199			sdata->vif.bss_conf.bssid = zero;
200	} else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
201		sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
202	else if (sdata->vif.type == NL80211_IFTYPE_AP)
203		sdata->vif.bss_conf.bssid = sdata->vif.addr;
204	else if (sdata->vif.type == NL80211_IFTYPE_WDS)
205		sdata->vif.bss_conf.bssid = NULL;
206	else if (ieee80211_vif_is_mesh(&sdata->vif)) {
207		sdata->vif.bss_conf.bssid = zero;
208	} else {
209		WARN_ON(1);
210		return;
211	}
212
213	switch (sdata->vif.type) {
214	case NL80211_IFTYPE_AP:
215	case NL80211_IFTYPE_ADHOC:
216	case NL80211_IFTYPE_WDS:
217	case NL80211_IFTYPE_MESH_POINT:
218		break;
219	default:
220		/* do not warn to simplify caller in scan.c */
221		changed &= ~BSS_CHANGED_BEACON_ENABLED;
222		if (WARN_ON(changed & BSS_CHANGED_BEACON))
223			return;
224		break;
225	}
226
227	if (changed & BSS_CHANGED_BEACON_ENABLED) {
228		if (local->quiescing || !ieee80211_sdata_running(sdata) ||
229		    test_bit(SCAN_SW_SCANNING, &local->scanning)) {
230			sdata->vif.bss_conf.enable_beacon = false;
231		} else {
232			/*
233			 * Beacon should be enabled, but AP mode must
234			 * check whether there is a beacon configured.
235			 */
236			switch (sdata->vif.type) {
237			case NL80211_IFTYPE_AP:
238				sdata->vif.bss_conf.enable_beacon =
239					!!sdata->u.ap.beacon;
240				break;
241			case NL80211_IFTYPE_ADHOC:
242				sdata->vif.bss_conf.enable_beacon =
243					!!sdata->u.ibss.presp;
244				break;
245			case NL80211_IFTYPE_MESH_POINT:
246				sdata->vif.bss_conf.enable_beacon = true;
247				break;
248			default:
249				/* not reached */
250				WARN_ON(1);
251				break;
252			}
253		}
254	}
255
256	drv_bss_info_changed(local, sdata, &sdata->vif.bss_conf, changed);
257}
258
259u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
260{
261	sdata->vif.bss_conf.use_cts_prot = false;
262	sdata->vif.bss_conf.use_short_preamble = false;
263	sdata->vif.bss_conf.use_short_slot = false;
264	return BSS_CHANGED_ERP_CTS_PROT |
265	       BSS_CHANGED_ERP_PREAMBLE |
266	       BSS_CHANGED_ERP_SLOT;
267}
268
269static void ieee80211_tasklet_handler(unsigned long data)
270{
271	struct ieee80211_local *local = (struct ieee80211_local *) data;
272	struct sk_buff *skb;
273
274	while ((skb = skb_dequeue(&local->skb_queue)) ||
275	       (skb = skb_dequeue(&local->skb_queue_unreliable))) {
276		switch (skb->pkt_type) {
277		case IEEE80211_RX_MSG:
278			/* Clear skb->pkt_type in order to not confuse kernel
279			 * netstack. */
280			skb->pkt_type = 0;
281			ieee80211_rx(local_to_hw(local), skb);
282			break;
283		case IEEE80211_TX_STATUS_MSG:
284			skb->pkt_type = 0;
285			ieee80211_tx_status(local_to_hw(local), skb);
286			break;
287		default:
288			WARN(1, "mac80211: Packet is of unknown type %d\n",
289			     skb->pkt_type);
290			dev_kfree_skb(skb);
291			break;
292		}
293	}
294}
295
296static void ieee80211_restart_work(struct work_struct *work)
297{
298	struct ieee80211_local *local =
299		container_of(work, struct ieee80211_local, restart_work);
300
301	/* wait for scan work complete */
302	flush_workqueue(local->workqueue);
303
304	mutex_lock(&local->mtx);
305	WARN(test_bit(SCAN_HW_SCANNING, &local->scanning),
306		"%s called with hardware scan in progress\n", __func__);
307	mutex_unlock(&local->mtx);
308
309	rtnl_lock();
310	ieee80211_scan_cancel(local);
311	ieee80211_reconfig(local);
312	rtnl_unlock();
313}
314
315void ieee80211_restart_hw(struct ieee80211_hw *hw)
316{
317	struct ieee80211_local *local = hw_to_local(hw);
318
319	trace_api_restart_hw(local);
320
321	/* use this reason, ieee80211_reconfig will unblock it */
322	ieee80211_stop_queues_by_reason(hw,
323		IEEE80211_QUEUE_STOP_REASON_SUSPEND);
324
325	schedule_work(&local->restart_work);
326}
327EXPORT_SYMBOL(ieee80211_restart_hw);
328
329static void ieee80211_recalc_smps_work(struct work_struct *work)
330{
331	struct ieee80211_local *local =
332		container_of(work, struct ieee80211_local, recalc_smps);
333
334	mutex_lock(&local->iflist_mtx);
335	ieee80211_recalc_smps(local);
336	mutex_unlock(&local->iflist_mtx);
337}
338
339#ifdef CONFIG_INET
340static int ieee80211_ifa_changed(struct notifier_block *nb,
341				 unsigned long data, void *arg)
342{
343	struct in_ifaddr *ifa = arg;
344	struct ieee80211_local *local =
345		container_of(nb, struct ieee80211_local,
346			     ifa_notifier);
347	struct net_device *ndev = ifa->ifa_dev->dev;
348	struct wireless_dev *wdev = ndev->ieee80211_ptr;
349	struct in_device *idev;
350	struct ieee80211_sub_if_data *sdata;
351	struct ieee80211_bss_conf *bss_conf;
352	struct ieee80211_if_managed *ifmgd;
353	int c = 0;
354
355	/* Make sure it's our interface that got changed */
356	if (!wdev)
357		return NOTIFY_DONE;
358
359	if (wdev->wiphy != local->hw.wiphy)
360		return NOTIFY_DONE;
361
362	sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
363	bss_conf = &sdata->vif.bss_conf;
364
365	if (!ieee80211_sdata_running(sdata))
366		return NOTIFY_DONE;
367
368	/* ARP filtering is only supported in managed mode */
369	if (sdata->vif.type != NL80211_IFTYPE_STATION)
370		return NOTIFY_DONE;
371
372	idev = sdata->dev->ip_ptr;
373	if (!idev)
374		return NOTIFY_DONE;
375
376	ifmgd = &sdata->u.mgd;
377	mutex_lock(&ifmgd->mtx);
378
379	/* Copy the addresses to the bss_conf list */
380	ifa = idev->ifa_list;
381	while (c < IEEE80211_BSS_ARP_ADDR_LIST_LEN && ifa) {
382		bss_conf->arp_addr_list[c] = ifa->ifa_address;
383		ifa = ifa->ifa_next;
384		c++;
385	}
386
387	/* If not all addresses fit the list, disable filtering */
388	if (ifa) {
389		sdata->arp_filter_state = false;
390		c = 0;
391	} else {
392		sdata->arp_filter_state = true;
393	}
394	bss_conf->arp_addr_cnt = c;
395
396	/* Configure driver only if associated */
397	if (ifmgd->associated) {
398		bss_conf->arp_filter_enabled = sdata->arp_filter_state;
399		ieee80211_bss_info_change_notify(sdata,
400						 BSS_CHANGED_ARP_FILTER);
401	}
402
403	mutex_unlock(&ifmgd->mtx);
404
405	return NOTIFY_DONE;
406}
407#endif
408
409static int ieee80211_napi_poll(struct napi_struct *napi, int budget)
410{
411	struct ieee80211_local *local =
412		container_of(napi, struct ieee80211_local, napi);
413
414	return local->ops->napi_poll(&local->hw, budget);
415}
416
417void ieee80211_napi_schedule(struct ieee80211_hw *hw)
418{
419	struct ieee80211_local *local = hw_to_local(hw);
420
421	napi_schedule(&local->napi);
422}
423EXPORT_SYMBOL(ieee80211_napi_schedule);
424
425void ieee80211_napi_complete(struct ieee80211_hw *hw)
426{
427	struct ieee80211_local *local = hw_to_local(hw);
428
429	napi_complete(&local->napi);
430}
431EXPORT_SYMBOL(ieee80211_napi_complete);
432
433/* There isn't a lot of sense in it, but you can transmit anything you like */
434static const struct ieee80211_txrx_stypes
435ieee80211_default_mgmt_stypes[NUM_NL80211_IFTYPES] = {
436	[NL80211_IFTYPE_ADHOC] = {
437		.tx = 0xffff,
438		.rx = BIT(IEEE80211_STYPE_ACTION >> 4),
439	},
440	[NL80211_IFTYPE_STATION] = {
441		.tx = 0xffff,
442		.rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
443			BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
444	},
445	[NL80211_IFTYPE_AP] = {
446		.tx = 0xffff,
447		.rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
448			BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
449			BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
450			BIT(IEEE80211_STYPE_DISASSOC >> 4) |
451			BIT(IEEE80211_STYPE_AUTH >> 4) |
452			BIT(IEEE80211_STYPE_DEAUTH >> 4) |
453			BIT(IEEE80211_STYPE_ACTION >> 4),
454	},
455	[NL80211_IFTYPE_AP_VLAN] = {
456		/* copy AP */
457		.tx = 0xffff,
458		.rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
459			BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
460			BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
461			BIT(IEEE80211_STYPE_DISASSOC >> 4) |
462			BIT(IEEE80211_STYPE_AUTH >> 4) |
463			BIT(IEEE80211_STYPE_DEAUTH >> 4) |
464			BIT(IEEE80211_STYPE_ACTION >> 4),
465	},
466	[NL80211_IFTYPE_P2P_CLIENT] = {
467		.tx = 0xffff,
468		.rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
469			BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
470	},
471	[NL80211_IFTYPE_P2P_GO] = {
472		.tx = 0xffff,
473		.rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
474			BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
475			BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
476			BIT(IEEE80211_STYPE_DISASSOC >> 4) |
477			BIT(IEEE80211_STYPE_AUTH >> 4) |
478			BIT(IEEE80211_STYPE_DEAUTH >> 4) |
479			BIT(IEEE80211_STYPE_ACTION >> 4),
480	},
481};
482
483struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
484					const struct ieee80211_ops *ops)
485{
486	struct ieee80211_local *local;
487	int priv_size, i;
488	struct wiphy *wiphy;
489
490	/* Ensure 32-byte alignment of our private data and hw private data.
491	 * We use the wiphy priv data for both our ieee80211_local and for
492	 * the driver's private data
493	 *
494	 * In memory it'll be like this:
495	 *
496	 * +-------------------------+
497	 * | struct wiphy	    |
498	 * +-------------------------+
499	 * | struct ieee80211_local  |
500	 * +-------------------------+
501	 * | driver's private data   |
502	 * +-------------------------+
503	 *
504	 */
505	priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
506
507	wiphy = wiphy_new(&mac80211_config_ops, priv_size);
508
509	if (!wiphy)
510		return NULL;
511
512	wiphy->mgmt_stypes = ieee80211_default_mgmt_stypes;
513
514	wiphy->flags |= WIPHY_FLAG_NETNS_OK |
515			WIPHY_FLAG_4ADDR_AP |
516			WIPHY_FLAG_4ADDR_STATION;
517	wiphy->privid = mac80211_wiphy_privid;
518
519	wiphy->bss_priv_size = sizeof(struct ieee80211_bss);
520
521	local = wiphy_priv(wiphy);
522
523	local->hw.wiphy = wiphy;
524
525	local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
526
527	BUG_ON(!ops->tx);
528	BUG_ON(!ops->start);
529	BUG_ON(!ops->stop);
530	BUG_ON(!ops->config);
531	BUG_ON(!ops->add_interface);
532	BUG_ON(!ops->remove_interface);
533	BUG_ON(!ops->configure_filter);
534	local->ops = ops;
535
536	/* set up some defaults */
537	local->hw.queues = 1;
538	local->hw.max_rates = 1;
539	local->hw.max_report_rates = 0;
540	local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
541	local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
542	local->user_power_level = -1;
543	local->uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;
544	local->uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN;
545
546	INIT_LIST_HEAD(&local->interfaces);
547
548	__hw_addr_init(&local->mc_list);
549
550	mutex_init(&local->iflist_mtx);
551	mutex_init(&local->mtx);
552
553	mutex_init(&local->key_mtx);
554	spin_lock_init(&local->filter_lock);
555	spin_lock_init(&local->queue_stop_reason_lock);
556
557	INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
558
559	ieee80211_work_init(local);
560
561	INIT_WORK(&local->restart_work, ieee80211_restart_work);
562
563	INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter);
564	INIT_WORK(&local->recalc_smps, ieee80211_recalc_smps_work);
565	local->smps_mode = IEEE80211_SMPS_OFF;
566
567	INIT_WORK(&local->dynamic_ps_enable_work,
568		  ieee80211_dynamic_ps_enable_work);
569	INIT_WORK(&local->dynamic_ps_disable_work,
570		  ieee80211_dynamic_ps_disable_work);
571	setup_timer(&local->dynamic_ps_timer,
572		    ieee80211_dynamic_ps_timer, (unsigned long) local);
573
574	sta_info_init(local);
575
576	for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
577		skb_queue_head_init(&local->pending[i]);
578		atomic_set(&local->agg_queue_stop[i], 0);
579	}
580	tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
581		     (unsigned long)local);
582
583	tasklet_init(&local->tasklet,
584		     ieee80211_tasklet_handler,
585		     (unsigned long) local);
586
587	skb_queue_head_init(&local->skb_queue);
588	skb_queue_head_init(&local->skb_queue_unreliable);
589
590	/* init dummy netdev for use w/ NAPI */
591	init_dummy_netdev(&local->napi_dev);
592
593	return local_to_hw(local);
594}
595EXPORT_SYMBOL(ieee80211_alloc_hw);
596
597int ieee80211_register_hw(struct ieee80211_hw *hw)
598{
599	struct ieee80211_local *local = hw_to_local(hw);
600	int result;
601	enum ieee80211_band band;
602	int channels, max_bitrates;
603	bool supp_ht;
604	static const u32 cipher_suites[] = {
605		/* keep WEP first, it may be removed below */
606		WLAN_CIPHER_SUITE_WEP40,
607		WLAN_CIPHER_SUITE_WEP104,
608		WLAN_CIPHER_SUITE_TKIP,
609		WLAN_CIPHER_SUITE_CCMP,
610
611		/* keep last -- depends on hw flags! */
612		WLAN_CIPHER_SUITE_AES_CMAC
613	};
614
615	if (hw->max_report_rates == 0)
616		hw->max_report_rates = hw->max_rates;
617
618	/*
619	 * generic code guarantees at least one band,
620	 * set this very early because much code assumes
621	 * that hw.conf.channel is assigned
622	 */
623	channels = 0;
624	max_bitrates = 0;
625	supp_ht = false;
626	for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
627		struct ieee80211_supported_band *sband;
628
629		sband = local->hw.wiphy->bands[band];
630		if (!sband)
631			continue;
632		if (!local->oper_channel) {
633			/* init channel we're on */
634			local->hw.conf.channel =
635			local->oper_channel = &sband->channels[0];
636			local->hw.conf.channel_type = NL80211_CHAN_NO_HT;
637		}
638		channels += sband->n_channels;
639
640		if (max_bitrates < sband->n_bitrates)
641			max_bitrates = sband->n_bitrates;
642		supp_ht = supp_ht || sband->ht_cap.ht_supported;
643	}
644
645	local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +
646				      sizeof(void *) * channels, GFP_KERNEL);
647	if (!local->int_scan_req)
648		return -ENOMEM;
649
650	/* if low-level driver supports AP, we also support VLAN */
651	if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP))
652		local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
653
654	/* mac80211 always supports monitor */
655	local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
656
657#ifndef CONFIG_MAC80211_MESH
658	/* mesh depends on Kconfig, but drivers should set it if they want */
659	local->hw.wiphy->interface_modes &= ~BIT(NL80211_IFTYPE_MESH_POINT);
660#endif
661
662	/* mac80211 supports control port protocol changing */
663	local->hw.wiphy->flags |= WIPHY_FLAG_CONTROL_PORT_PROTOCOL;
664
665	if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
666		local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
667	else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
668		local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
669
670	WARN((local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)
671	     && (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK),
672	     "U-APSD not supported with HW_PS_NULLFUNC_STACK\n");
673
674	/*
675	 * Calculate scan IE length -- we need this to alloc
676	 * memory and to subtract from the driver limit. It
677	 * includes the (extended) supported rates and HT
678	 * information -- SSID is the driver's responsibility.
679	 */
680	local->scan_ies_len = 4 + max_bitrates; /* (ext) supp rates */
681	if (supp_ht)
682		local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
683
684	if (!local->ops->hw_scan) {
685		/* For hw_scan, driver needs to set these up. */
686		local->hw.wiphy->max_scan_ssids = 4;
687		local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
688	}
689
690	/*
691	 * If the driver supports any scan IEs, then assume the
692	 * limit includes the IEs mac80211 will add, otherwise
693	 * leave it at zero and let the driver sort it out; we
694	 * still pass our IEs to the driver but userspace will
695	 * not be allowed to in that case.
696	 */
697	if (local->hw.wiphy->max_scan_ie_len)
698		local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
699
700	/* Set up cipher suites unless driver already did */
701	if (!local->hw.wiphy->cipher_suites) {
702		local->hw.wiphy->cipher_suites = cipher_suites;
703		local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
704		if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
705			local->hw.wiphy->n_cipher_suites--;
706	}
707	if (IS_ERR(local->wep_tx_tfm) || IS_ERR(local->wep_rx_tfm)) {
708		if (local->hw.wiphy->cipher_suites == cipher_suites) {
709			local->hw.wiphy->cipher_suites += 2;
710			local->hw.wiphy->n_cipher_suites -= 2;
711		} else {
712			u32 *suites;
713			int r, w = 0;
714
715			/* Filter out WEP */
716
717			suites = kmemdup(
718				local->hw.wiphy->cipher_suites,
719				sizeof(u32) * local->hw.wiphy->n_cipher_suites,
720				GFP_KERNEL);
721			if (!suites)
722				return -ENOMEM;
723			for (r = 0; r < local->hw.wiphy->n_cipher_suites; r++) {
724				u32 suite = local->hw.wiphy->cipher_suites[r];
725				if (suite == WLAN_CIPHER_SUITE_WEP40 ||
726				    suite == WLAN_CIPHER_SUITE_WEP104)
727					continue;
728				suites[w++] = suite;
729			}
730			local->hw.wiphy->cipher_suites = suites;
731			local->hw.wiphy->n_cipher_suites = w;
732			local->wiphy_ciphers_allocated = true;
733		}
734	}
735
736	result = wiphy_register(local->hw.wiphy);
737	if (result < 0)
738		goto fail_wiphy_register;
739
740	/*
741	 * We use the number of queues for feature tests (QoS, HT) internally
742	 * so restrict them appropriately.
743	 */
744	if (hw->queues > IEEE80211_MAX_QUEUES)
745		hw->queues = IEEE80211_MAX_QUEUES;
746
747	local->workqueue =
748		create_singlethread_workqueue(wiphy_name(local->hw.wiphy));
749	if (!local->workqueue) {
750		result = -ENOMEM;
751		goto fail_workqueue;
752	}
753
754	/*
755	 * The hardware needs headroom for sending the frame,
756	 * and we need some headroom for passing the frame to monitor
757	 * interfaces, but never both at the same time.
758	 */
759	BUILD_BUG_ON(IEEE80211_TX_STATUS_HEADROOM !=
760			sizeof(struct ieee80211_tx_status_rtap_hdr));
761	local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
762				   sizeof(struct ieee80211_tx_status_rtap_hdr));
763
764	debugfs_hw_add(local);
765
766	/*
767	 * if the driver doesn't specify a max listen interval we
768	 * use 5 which should be a safe default
769	 */
770	if (local->hw.max_listen_interval == 0)
771		local->hw.max_listen_interval = 5;
772
773	local->hw.conf.listen_interval = local->hw.max_listen_interval;
774
775	local->dynamic_ps_forced_timeout = -1;
776
777	result = sta_info_start(local);
778	if (result < 0)
779		goto fail_sta_info;
780
781	result = ieee80211_wep_init(local);
782	if (result < 0)
783		wiphy_debug(local->hw.wiphy, "Failed to initialize wep: %d\n",
784			    result);
785
786	rtnl_lock();
787
788	result = ieee80211_init_rate_ctrl_alg(local,
789					      hw->rate_control_algorithm);
790	if (result < 0) {
791		wiphy_debug(local->hw.wiphy,
792			    "Failed to initialize rate control algorithm\n");
793		goto fail_rate;
794	}
795
796	/* add one default STA interface if supported */
797	if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
798		result = ieee80211_if_add(local, "wlan%d", NULL,
799					  NL80211_IFTYPE_STATION, NULL);
800		if (result)
801			wiphy_warn(local->hw.wiphy,
802				   "Failed to add default virtual iface\n");
803	}
804
805	rtnl_unlock();
806
807	ieee80211_led_init(local);
808
809	local->network_latency_notifier.notifier_call =
810		ieee80211_max_network_latency;
811	result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
812				     &local->network_latency_notifier);
813	if (result) {
814		rtnl_lock();
815		goto fail_pm_qos;
816	}
817
818#ifdef CONFIG_INET
819	local->ifa_notifier.notifier_call = ieee80211_ifa_changed;
820	result = register_inetaddr_notifier(&local->ifa_notifier);
821	if (result)
822		goto fail_ifa;
823#endif
824
825	netif_napi_add(&local->napi_dev, &local->napi, ieee80211_napi_poll,
826			local->hw.napi_weight);
827
828	return 0;
829
830#ifdef CONFIG_INET
831 fail_ifa:
832	pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
833			       &local->network_latency_notifier);
834	rtnl_lock();
835#endif
836 fail_pm_qos:
837	ieee80211_led_exit(local);
838	ieee80211_remove_interfaces(local);
839 fail_rate:
840	rtnl_unlock();
841	ieee80211_wep_free(local);
842	sta_info_stop(local);
843 fail_sta_info:
844	destroy_workqueue(local->workqueue);
845 fail_workqueue:
846	wiphy_unregister(local->hw.wiphy);
847 fail_wiphy_register:
848	if (local->wiphy_ciphers_allocated)
849		kfree(local->hw.wiphy->cipher_suites);
850	kfree(local->int_scan_req);
851	return result;
852}
853EXPORT_SYMBOL(ieee80211_register_hw);
854
855void ieee80211_unregister_hw(struct ieee80211_hw *hw)
856{
857	struct ieee80211_local *local = hw_to_local(hw);
858
859	tasklet_kill(&local->tx_pending_tasklet);
860	tasklet_kill(&local->tasklet);
861
862	pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
863			       &local->network_latency_notifier);
864#ifdef CONFIG_INET
865	unregister_inetaddr_notifier(&local->ifa_notifier);
866#endif
867
868	rtnl_lock();
869
870	/*
871	 * At this point, interface list manipulations are fine
872	 * because the driver cannot be handing us frames any
873	 * more and the tasklet is killed.
874	 */
875	ieee80211_remove_interfaces(local);
876
877	rtnl_unlock();
878
879	/*
880	 * Now all work items will be gone, but the
881	 * timer might still be armed, so delete it
882	 */
883	del_timer_sync(&local->work_timer);
884
885	cancel_work_sync(&local->restart_work);
886	cancel_work_sync(&local->reconfig_filter);
887
888	ieee80211_clear_tx_pending(local);
889	sta_info_stop(local);
890	rate_control_deinitialize(local);
891
892	if (skb_queue_len(&local->skb_queue) ||
893	    skb_queue_len(&local->skb_queue_unreliable))
894		wiphy_warn(local->hw.wiphy, "skb_queue not empty\n");
895	skb_queue_purge(&local->skb_queue);
896	skb_queue_purge(&local->skb_queue_unreliable);
897
898	destroy_workqueue(local->workqueue);
899	wiphy_unregister(local->hw.wiphy);
900	ieee80211_wep_free(local);
901	ieee80211_led_exit(local);
902	kfree(local->int_scan_req);
903}
904EXPORT_SYMBOL(ieee80211_unregister_hw);
905
906void ieee80211_free_hw(struct ieee80211_hw *hw)
907{
908	struct ieee80211_local *local = hw_to_local(hw);
909
910	mutex_destroy(&local->iflist_mtx);
911	mutex_destroy(&local->mtx);
912
913	if (local->wiphy_ciphers_allocated)
914		kfree(local->hw.wiphy->cipher_suites);
915
916	wiphy_free(local->hw.wiphy);
917}
918EXPORT_SYMBOL(ieee80211_free_hw);
919
920static int __init ieee80211_init(void)
921{
922	struct sk_buff *skb;
923	int ret;
924
925	BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
926	BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
927		     IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
928
929	ret = rc80211_minstrel_init();
930	if (ret)
931		return ret;
932
933	ret = rc80211_minstrel_ht_init();
934	if (ret)
935		goto err_minstrel;
936
937	ret = rc80211_pid_init();
938	if (ret)
939		goto err_pid;
940
941	ret = ieee80211_iface_init();
942	if (ret)
943		goto err_netdev;
944
945	return 0;
946 err_netdev:
947	rc80211_pid_exit();
948 err_pid:
949	rc80211_minstrel_ht_exit();
950 err_minstrel:
951	rc80211_minstrel_exit();
952
953	return ret;
954}
955
956static void __exit ieee80211_exit(void)
957{
958	rc80211_pid_exit();
959	rc80211_minstrel_ht_exit();
960	rc80211_minstrel_exit();
961
962	/*
963	 * For key todo, it'll be empty by now but the work
964	 * might still be scheduled.
965	 */
966	flush_scheduled_work();
967
968	if (mesh_allocated)
969		ieee80211s_stop();
970
971	ieee80211_iface_exit();
972}
973
974
975subsys_initcall(ieee80211_init);
976module_exit(ieee80211_exit);
977
978MODULE_DESCRIPTION("IEEE 802.11 subsystem");
979MODULE_LICENSE("GPL");
980