main.c revision 3b8d81e020f77c9da8b85b0685c8cd2ca7c7b150 
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 <linux/pm_qos_params.h>
25#include <net/net_namespace.h>
26#include <net/cfg80211.h>
27
28#include "ieee80211_i.h"
29#include "driver-ops.h"
30#include "rate.h"
31#include "mesh.h"
32#include "wep.h"
33#include "wme.h"
34#include "aes_ccm.h"
35#include "led.h"
36#include "cfg.h"
37#include "debugfs.h"
38#include "debugfs_netdev.h"
39
40/*
41 * For seeing transmitted packets on monitor interfaces
42 * we have a radiotap header too.
43 */
44struct ieee80211_tx_status_rtap_hdr {
45	struct ieee80211_radiotap_header hdr;
46	u8 rate;
47	u8 padding_for_rate;
48	__le16 tx_flags;
49	u8 data_retries;
50} __attribute__ ((packed));
51
52
53/* must be called under mdev tx lock */
54void ieee80211_configure_filter(struct ieee80211_local *local)
55{
56	unsigned int changed_flags;
57	unsigned int new_flags = 0;
58
59	if (atomic_read(&local->iff_promiscs))
60		new_flags |= FIF_PROMISC_IN_BSS;
61
62	if (atomic_read(&local->iff_allmultis))
63		new_flags |= FIF_ALLMULTI;
64
65	if (local->monitors)
66		new_flags |= FIF_BCN_PRBRESP_PROMISC;
67
68	if (local->fif_fcsfail)
69		new_flags |= FIF_FCSFAIL;
70
71	if (local->fif_plcpfail)
72		new_flags |= FIF_PLCPFAIL;
73
74	if (local->fif_control)
75		new_flags |= FIF_CONTROL;
76
77	if (local->fif_other_bss)
78		new_flags |= FIF_OTHER_BSS;
79
80	changed_flags = local->filter_flags ^ new_flags;
81
82	/* be a bit nasty */
83	new_flags |= (1<<31);
84
85	drv_configure_filter(local, changed_flags, &new_flags,
86			     local->mc_count,
87			     local->mc_list);
88
89	WARN_ON(new_flags & (1<<31));
90
91	local->filter_flags = new_flags & ~(1<<31);
92}
93
94int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
95{
96	struct ieee80211_channel *chan, *scan_chan;
97	int ret = 0;
98	int power;
99	enum nl80211_channel_type channel_type;
100
101	might_sleep();
102
103	scan_chan = local->scan_channel;
104
105	if (scan_chan) {
106		chan = scan_chan;
107		channel_type = NL80211_CHAN_NO_HT;
108	} else {
109		chan = local->oper_channel;
110		channel_type = local->oper_channel_type;
111	}
112
113	if (chan != local->hw.conf.channel ||
114	    channel_type != local->hw.conf.channel_type) {
115		local->hw.conf.channel = chan;
116		local->hw.conf.channel_type = channel_type;
117		changed |= IEEE80211_CONF_CHANGE_CHANNEL;
118	}
119
120	if (scan_chan)
121		power = chan->max_power;
122	else
123		power = local->power_constr_level ?
124			(chan->max_power - local->power_constr_level) :
125			chan->max_power;
126
127	if (local->user_power_level >= 0)
128		power = min(power, local->user_power_level);
129
130	if (local->hw.conf.power_level != power) {
131		changed |= IEEE80211_CONF_CHANGE_POWER;
132		local->hw.conf.power_level = power;
133	}
134
135	if (changed && local->open_count) {
136		ret = drv_config(local, changed);
137		/*
138		 * Goal:
139		 * HW reconfiguration should never fail, the driver has told
140		 * us what it can support so it should live up to that promise.
141		 *
142		 * Current status:
143		 * rfkill is not integrated with mac80211 and a
144		 * configuration command can thus fail if hardware rfkill
145		 * is enabled
146		 *
147		 * FIXME: integrate rfkill with mac80211 and then add this
148		 * WARN_ON() back
149		 *
150		 */
151		/* WARN_ON(ret); */
152	}
153
154	return ret;
155}
156
157void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
158				      u32 changed)
159{
160	struct ieee80211_local *local = sdata->local;
161	static const u8 zero[ETH_ALEN] = { 0 };
162
163	if (!changed)
164		return;
165
166	if (sdata->vif.type == NL80211_IFTYPE_STATION) {
167		/*
168		 * While not associated, claim a BSSID of all-zeroes
169		 * so that drivers don't do any weird things with the
170		 * BSSID at that time.
171		 */
172		if (sdata->vif.bss_conf.assoc)
173			sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
174		else
175			sdata->vif.bss_conf.bssid = zero;
176	} else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
177		sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
178	else if (sdata->vif.type == NL80211_IFTYPE_AP)
179		sdata->vif.bss_conf.bssid = sdata->dev->dev_addr;
180	else if (ieee80211_vif_is_mesh(&sdata->vif)) {
181		sdata->vif.bss_conf.bssid = zero;
182	} else {
183		WARN_ON(1);
184		return;
185	}
186
187	switch (sdata->vif.type) {
188	case NL80211_IFTYPE_AP:
189	case NL80211_IFTYPE_ADHOC:
190	case NL80211_IFTYPE_MESH_POINT:
191		break;
192	default:
193		/* do not warn to simplify caller in scan.c */
194		changed &= ~BSS_CHANGED_BEACON_ENABLED;
195		if (WARN_ON(changed & BSS_CHANGED_BEACON))
196			return;
197		break;
198	}
199
200	if (changed & BSS_CHANGED_BEACON_ENABLED) {
201		if (local->sw_scanning) {
202			sdata->vif.bss_conf.enable_beacon = false;
203		} else {
204			/*
205			 * Beacon should be enabled, but AP mode must
206			 * check whether there is a beacon configured.
207			 */
208			switch (sdata->vif.type) {
209			case NL80211_IFTYPE_AP:
210				sdata->vif.bss_conf.enable_beacon =
211					!!rcu_dereference(sdata->u.ap.beacon);
212				break;
213			case NL80211_IFTYPE_ADHOC:
214				sdata->vif.bss_conf.enable_beacon =
215					!!rcu_dereference(sdata->u.ibss.presp);
216				break;
217			case NL80211_IFTYPE_MESH_POINT:
218				sdata->vif.bss_conf.enable_beacon = true;
219				break;
220			default:
221				/* not reached */
222				WARN_ON(1);
223				break;
224			}
225		}
226	}
227
228	drv_bss_info_changed(local, &sdata->vif,
229			     &sdata->vif.bss_conf, changed);
230
231	/* DEPRECATED */
232	local->hw.conf.beacon_int = sdata->vif.bss_conf.beacon_int;
233}
234
235u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
236{
237	sdata->vif.bss_conf.use_cts_prot = false;
238	sdata->vif.bss_conf.use_short_preamble = false;
239	sdata->vif.bss_conf.use_short_slot = false;
240	return BSS_CHANGED_ERP_CTS_PROT |
241	       BSS_CHANGED_ERP_PREAMBLE |
242	       BSS_CHANGED_ERP_SLOT;
243}
244
245void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
246				 struct sk_buff *skb)
247{
248	struct ieee80211_local *local = hw_to_local(hw);
249	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
250	int tmp;
251
252	skb->pkt_type = IEEE80211_TX_STATUS_MSG;
253	skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ?
254		       &local->skb_queue : &local->skb_queue_unreliable, skb);
255	tmp = skb_queue_len(&local->skb_queue) +
256		skb_queue_len(&local->skb_queue_unreliable);
257	while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
258	       (skb = skb_dequeue(&local->skb_queue_unreliable))) {
259		dev_kfree_skb_irq(skb);
260		tmp--;
261		I802_DEBUG_INC(local->tx_status_drop);
262	}
263	tasklet_schedule(&local->tasklet);
264}
265EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
266
267static void ieee80211_tasklet_handler(unsigned long data)
268{
269	struct ieee80211_local *local = (struct ieee80211_local *) data;
270	struct sk_buff *skb;
271	struct ieee80211_ra_tid *ra_tid;
272
273	while ((skb = skb_dequeue(&local->skb_queue)) ||
274	       (skb = skb_dequeue(&local->skb_queue_unreliable))) {
275		switch (skb->pkt_type) {
276		case IEEE80211_RX_MSG:
277			/* Clear skb->pkt_type in order to not confuse kernel
278			 * netstack. */
279			skb->pkt_type = 0;
280			ieee80211_rx(local_to_hw(local), skb);
281			break;
282		case IEEE80211_TX_STATUS_MSG:
283			skb->pkt_type = 0;
284			ieee80211_tx_status(local_to_hw(local), skb);
285			break;
286		case IEEE80211_DELBA_MSG:
287			ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
288			ieee80211_stop_tx_ba_cb(local_to_hw(local),
289						ra_tid->ra, ra_tid->tid);
290			dev_kfree_skb(skb);
291			break;
292		case IEEE80211_ADDBA_MSG:
293			ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
294			ieee80211_start_tx_ba_cb(local_to_hw(local),
295						 ra_tid->ra, ra_tid->tid);
296			dev_kfree_skb(skb);
297			break ;
298		default:
299			WARN(1, "mac80211: Packet is of unknown type %d\n",
300			     skb->pkt_type);
301			dev_kfree_skb(skb);
302			break;
303		}
304	}
305}
306
307static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
308					    struct sta_info *sta,
309					    struct sk_buff *skb)
310{
311	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
312
313	sta->tx_filtered_count++;
314
315	/*
316	 * Clear the TX filter mask for this STA when sending the next
317	 * packet. If the STA went to power save mode, this will happen
318	 * when it wakes up for the next time.
319	 */
320	set_sta_flags(sta, WLAN_STA_CLEAR_PS_FILT);
321
322	/*
323	 * This code races in the following way:
324	 *
325	 *  (1) STA sends frame indicating it will go to sleep and does so
326	 *  (2) hardware/firmware adds STA to filter list, passes frame up
327	 *  (3) hardware/firmware processes TX fifo and suppresses a frame
328	 *  (4) we get TX status before having processed the frame and
329	 *	knowing that the STA has gone to sleep.
330	 *
331	 * This is actually quite unlikely even when both those events are
332	 * processed from interrupts coming in quickly after one another or
333	 * even at the same time because we queue both TX status events and
334	 * RX frames to be processed by a tasklet and process them in the
335	 * same order that they were received or TX status last. Hence, there
336	 * is no race as long as the frame RX is processed before the next TX
337	 * status, which drivers can ensure, see below.
338	 *
339	 * Note that this can only happen if the hardware or firmware can
340	 * actually add STAs to the filter list, if this is done by the
341	 * driver in response to set_tim() (which will only reduce the race
342	 * this whole filtering tries to solve, not completely solve it)
343	 * this situation cannot happen.
344	 *
345	 * To completely solve this race drivers need to make sure that they
346	 *  (a) don't mix the irq-safe/not irq-safe TX status/RX processing
347	 *	functions and
348	 *  (b) always process RX events before TX status events if ordering
349	 *      can be unknown, for example with different interrupt status
350	 *	bits.
351	 */
352	if (test_sta_flags(sta, WLAN_STA_PS) &&
353	    skb_queue_len(&sta->tx_filtered) < STA_MAX_TX_BUFFER) {
354		skb_queue_tail(&sta->tx_filtered, skb);
355		return;
356	}
357
358	if (!test_sta_flags(sta, WLAN_STA_PS) &&
359	    !(info->flags & IEEE80211_TX_INTFL_RETRIED)) {
360		/* Software retry the packet once */
361		info->flags |= IEEE80211_TX_INTFL_RETRIED;
362		ieee80211_add_pending_skb(local, skb);
363		return;
364	}
365
366#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
367	if (net_ratelimit())
368		printk(KERN_DEBUG "%s: dropped TX filtered frame, "
369		       "queue_len=%d PS=%d @%lu\n",
370		       wiphy_name(local->hw.wiphy),
371		       skb_queue_len(&sta->tx_filtered),
372		       !!test_sta_flags(sta, WLAN_STA_PS), jiffies);
373#endif
374	dev_kfree_skb(skb);
375}
376
377void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
378{
379	struct sk_buff *skb2;
380	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
381	struct ieee80211_local *local = hw_to_local(hw);
382	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
383	u16 frag, type;
384	__le16 fc;
385	struct ieee80211_supported_band *sband;
386	struct ieee80211_tx_status_rtap_hdr *rthdr;
387	struct ieee80211_sub_if_data *sdata;
388	struct net_device *prev_dev = NULL;
389	struct sta_info *sta;
390	int retry_count = -1, i;
391
392	for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
393		/* the HW cannot have attempted that rate */
394		if (i >= hw->max_rates) {
395			info->status.rates[i].idx = -1;
396			info->status.rates[i].count = 0;
397		}
398
399		retry_count += info->status.rates[i].count;
400	}
401	if (retry_count < 0)
402		retry_count = 0;
403
404	rcu_read_lock();
405
406	sband = local->hw.wiphy->bands[info->band];
407
408	sta = sta_info_get(local, hdr->addr1);
409
410	if (sta) {
411		if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
412		    test_sta_flags(sta, WLAN_STA_PS)) {
413			/*
414			 * The STA is in power save mode, so assume
415			 * that this TX packet failed because of that.
416			 */
417			ieee80211_handle_filtered_frame(local, sta, skb);
418			rcu_read_unlock();
419			return;
420		}
421
422		fc = hdr->frame_control;
423
424		if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
425		    (ieee80211_is_data_qos(fc))) {
426			u16 tid, ssn;
427			u8 *qc;
428
429			qc = ieee80211_get_qos_ctl(hdr);
430			tid = qc[0] & 0xf;
431			ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
432						& IEEE80211_SCTL_SEQ);
433			ieee80211_send_bar(sta->sdata, hdr->addr1,
434					   tid, ssn);
435		}
436
437		if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
438			ieee80211_handle_filtered_frame(local, sta, skb);
439			rcu_read_unlock();
440			return;
441		} else {
442			if (!(info->flags & IEEE80211_TX_STAT_ACK))
443				sta->tx_retry_failed++;
444			sta->tx_retry_count += retry_count;
445		}
446
447		rate_control_tx_status(local, sband, sta, skb);
448	}
449
450	rcu_read_unlock();
451
452	ieee80211_led_tx(local, 0);
453
454	/* SNMP counters
455	 * Fragments are passed to low-level drivers as separate skbs, so these
456	 * are actually fragments, not frames. Update frame counters only for
457	 * the first fragment of the frame. */
458
459	frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG;
460	type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE;
461
462	if (info->flags & IEEE80211_TX_STAT_ACK) {
463		if (frag == 0) {
464			local->dot11TransmittedFrameCount++;
465			if (is_multicast_ether_addr(hdr->addr1))
466				local->dot11MulticastTransmittedFrameCount++;
467			if (retry_count > 0)
468				local->dot11RetryCount++;
469			if (retry_count > 1)
470				local->dot11MultipleRetryCount++;
471		}
472
473		/* This counter shall be incremented for an acknowledged MPDU
474		 * with an individual address in the address 1 field or an MPDU
475		 * with a multicast address in the address 1 field of type Data
476		 * or Management. */
477		if (!is_multicast_ether_addr(hdr->addr1) ||
478		    type == IEEE80211_FTYPE_DATA ||
479		    type == IEEE80211_FTYPE_MGMT)
480			local->dot11TransmittedFragmentCount++;
481	} else {
482		if (frag == 0)
483			local->dot11FailedCount++;
484	}
485
486	/* this was a transmitted frame, but now we want to reuse it */
487	skb_orphan(skb);
488
489	/*
490	 * This is a bit racy but we can avoid a lot of work
491	 * with this test...
492	 */
493	if (!local->monitors && !local->cooked_mntrs) {
494		dev_kfree_skb(skb);
495		return;
496	}
497
498	/* send frame to monitor interfaces now */
499
500	if (skb_headroom(skb) < sizeof(*rthdr)) {
501		printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
502		dev_kfree_skb(skb);
503		return;
504	}
505
506	rthdr = (struct ieee80211_tx_status_rtap_hdr *)
507				skb_push(skb, sizeof(*rthdr));
508
509	memset(rthdr, 0, sizeof(*rthdr));
510	rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
511	rthdr->hdr.it_present =
512		cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
513			    (1 << IEEE80211_RADIOTAP_DATA_RETRIES) |
514			    (1 << IEEE80211_RADIOTAP_RATE));
515
516	if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
517	    !is_multicast_ether_addr(hdr->addr1))
518		rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL);
519
520	/*
521	 * XXX: Once radiotap gets the bitmap reset thing the vendor
522	 *	extensions proposal contains, we can actually report
523	 *	the whole set of tries we did.
524	 */
525	if ((info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) ||
526	    (info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT))
527		rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS);
528	else if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS)
529		rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS);
530	if (info->status.rates[0].idx >= 0 &&
531	    !(info->status.rates[0].flags & IEEE80211_TX_RC_MCS))
532		rthdr->rate = sband->bitrates[
533				info->status.rates[0].idx].bitrate / 5;
534
535	/* for now report the total retry_count */
536	rthdr->data_retries = retry_count;
537
538	/* XXX: is this sufficient for BPF? */
539	skb_set_mac_header(skb, 0);
540	skb->ip_summed = CHECKSUM_UNNECESSARY;
541	skb->pkt_type = PACKET_OTHERHOST;
542	skb->protocol = htons(ETH_P_802_2);
543	memset(skb->cb, 0, sizeof(skb->cb));
544
545	rcu_read_lock();
546	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
547		if (sdata->vif.type == NL80211_IFTYPE_MONITOR) {
548			if (!netif_running(sdata->dev))
549				continue;
550
551			if (prev_dev) {
552				skb2 = skb_clone(skb, GFP_ATOMIC);
553				if (skb2) {
554					skb2->dev = prev_dev;
555					netif_rx(skb2);
556				}
557			}
558
559			prev_dev = sdata->dev;
560		}
561	}
562	if (prev_dev) {
563		skb->dev = prev_dev;
564		netif_rx(skb);
565		skb = NULL;
566	}
567	rcu_read_unlock();
568	dev_kfree_skb(skb);
569}
570EXPORT_SYMBOL(ieee80211_tx_status);
571
572static void ieee80211_restart_work(struct work_struct *work)
573{
574	struct ieee80211_local *local =
575		container_of(work, struct ieee80211_local, restart_work);
576
577	rtnl_lock();
578	ieee80211_reconfig(local);
579	rtnl_unlock();
580}
581
582void ieee80211_restart_hw(struct ieee80211_hw *hw)
583{
584	struct ieee80211_local *local = hw_to_local(hw);
585
586	/* use this reason, __ieee80211_resume will unblock it */
587	ieee80211_stop_queues_by_reason(hw,
588		IEEE80211_QUEUE_STOP_REASON_SUSPEND);
589
590	schedule_work(&local->restart_work);
591}
592EXPORT_SYMBOL(ieee80211_restart_hw);
593
594struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
595					const struct ieee80211_ops *ops)
596{
597	struct ieee80211_local *local;
598	int priv_size, i;
599	struct wiphy *wiphy;
600
601	/* Ensure 32-byte alignment of our private data and hw private data.
602	 * We use the wiphy priv data for both our ieee80211_local and for
603	 * the driver's private data
604	 *
605	 * In memory it'll be like this:
606	 *
607	 * +-------------------------+
608	 * | struct wiphy	    |
609	 * +-------------------------+
610	 * | struct ieee80211_local  |
611	 * +-------------------------+
612	 * | driver's private data   |
613	 * +-------------------------+
614	 *
615	 */
616	priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
617
618	wiphy = wiphy_new(&mac80211_config_ops, priv_size);
619
620	if (!wiphy)
621		return NULL;
622
623	wiphy->privid = mac80211_wiphy_privid;
624
625	/* Yes, putting cfg80211_bss into ieee80211_bss is a hack */
626	wiphy->bss_priv_size = sizeof(struct ieee80211_bss) -
627			       sizeof(struct cfg80211_bss);
628
629	local = wiphy_priv(wiphy);
630
631	local->hw.wiphy = wiphy;
632
633	local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
634
635	BUG_ON(!ops->tx);
636	BUG_ON(!ops->start);
637	BUG_ON(!ops->stop);
638	BUG_ON(!ops->config);
639	BUG_ON(!ops->add_interface);
640	BUG_ON(!ops->remove_interface);
641	BUG_ON(!ops->configure_filter);
642	local->ops = ops;
643
644	/* set up some defaults */
645	local->hw.queues = 1;
646	local->hw.max_rates = 1;
647	local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
648	local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
649	local->hw.conf.radio_enabled = true;
650	local->user_power_level = -1;
651
652	INIT_LIST_HEAD(&local->interfaces);
653	mutex_init(&local->iflist_mtx);
654	mutex_init(&local->scan_mtx);
655
656	spin_lock_init(&local->key_lock);
657	spin_lock_init(&local->filter_lock);
658	spin_lock_init(&local->queue_stop_reason_lock);
659
660	INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
661
662	INIT_WORK(&local->restart_work, ieee80211_restart_work);
663
664	INIT_WORK(&local->dynamic_ps_enable_work,
665		  ieee80211_dynamic_ps_enable_work);
666	INIT_WORK(&local->dynamic_ps_disable_work,
667		  ieee80211_dynamic_ps_disable_work);
668	setup_timer(&local->dynamic_ps_timer,
669		    ieee80211_dynamic_ps_timer, (unsigned long) local);
670
671	sta_info_init(local);
672
673	for (i = 0; i < IEEE80211_MAX_QUEUES; i++)
674		skb_queue_head_init(&local->pending[i]);
675	tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
676		     (unsigned long)local);
677	tasklet_disable(&local->tx_pending_tasklet);
678
679	tasklet_init(&local->tasklet,
680		     ieee80211_tasklet_handler,
681		     (unsigned long) local);
682	tasklet_disable(&local->tasklet);
683
684	skb_queue_head_init(&local->skb_queue);
685	skb_queue_head_init(&local->skb_queue_unreliable);
686
687	spin_lock_init(&local->ampdu_lock);
688
689	return local_to_hw(local);
690}
691EXPORT_SYMBOL(ieee80211_alloc_hw);
692
693int ieee80211_register_hw(struct ieee80211_hw *hw)
694{
695	struct ieee80211_local *local = hw_to_local(hw);
696	int result;
697	enum ieee80211_band band;
698	int channels, i, j, max_bitrates;
699	bool supp_ht;
700	static const u32 cipher_suites[] = {
701		WLAN_CIPHER_SUITE_WEP40,
702		WLAN_CIPHER_SUITE_WEP104,
703		WLAN_CIPHER_SUITE_TKIP,
704		WLAN_CIPHER_SUITE_CCMP,
705
706		/* keep last -- depends on hw flags! */
707		WLAN_CIPHER_SUITE_AES_CMAC
708	};
709
710	/*
711	 * generic code guarantees at least one band,
712	 * set this very early because much code assumes
713	 * that hw.conf.channel is assigned
714	 */
715	channels = 0;
716	max_bitrates = 0;
717	supp_ht = false;
718	for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
719		struct ieee80211_supported_band *sband;
720
721		sband = local->hw.wiphy->bands[band];
722		if (!sband)
723			continue;
724		if (!local->oper_channel) {
725			/* init channel we're on */
726			local->hw.conf.channel =
727			local->oper_channel = &sband->channels[0];
728			local->hw.conf.channel_type = NL80211_CHAN_NO_HT;
729		}
730		channels += sband->n_channels;
731
732		if (max_bitrates < sband->n_bitrates)
733			max_bitrates = sband->n_bitrates;
734		supp_ht = supp_ht || sband->ht_cap.ht_supported;
735	}
736
737	local->int_scan_req.n_channels = channels;
738	local->int_scan_req.channels = kzalloc(sizeof(void *) * channels, GFP_KERNEL);
739	if (!local->int_scan_req.channels)
740		return -ENOMEM;
741
742	/* if low-level driver supports AP, we also support VLAN */
743	if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP))
744		local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
745
746	/* mac80211 always supports monitor */
747	local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
748
749	if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
750		local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
751	else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
752		local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
753
754	/*
755	 * Calculate scan IE length -- we need this to alloc
756	 * memory and to subtract from the driver limit. It
757	 * includes the (extended) supported rates and HT
758	 * information -- SSID is the driver's responsibility.
759	 */
760	local->scan_ies_len = 4 + max_bitrates; /* (ext) supp rates */
761	if (supp_ht)
762		local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
763
764	if (!local->ops->hw_scan) {
765		/* For hw_scan, driver needs to set these up. */
766		local->hw.wiphy->max_scan_ssids = 4;
767		local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
768	}
769
770	/*
771	 * If the driver supports any scan IEs, then assume the
772	 * limit includes the IEs mac80211 will add, otherwise
773	 * leave it at zero and let the driver sort it out; we
774	 * still pass our IEs to the driver but userspace will
775	 * not be allowed to in that case.
776	 */
777	if (local->hw.wiphy->max_scan_ie_len)
778		local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
779
780	local->hw.wiphy->cipher_suites = cipher_suites;
781	local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
782	if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
783		local->hw.wiphy->n_cipher_suites--;
784
785	result = wiphy_register(local->hw.wiphy);
786	if (result < 0)
787		goto fail_wiphy_register;
788
789	/*
790	 * We use the number of queues for feature tests (QoS, HT) internally
791	 * so restrict them appropriately.
792	 */
793	if (hw->queues > IEEE80211_MAX_QUEUES)
794		hw->queues = IEEE80211_MAX_QUEUES;
795
796	local->hw.workqueue =
797		create_singlethread_workqueue(wiphy_name(local->hw.wiphy));
798	if (!local->hw.workqueue) {
799		result = -ENOMEM;
800		goto fail_workqueue;
801	}
802
803	/*
804	 * The hardware needs headroom for sending the frame,
805	 * and we need some headroom for passing the frame to monitor
806	 * interfaces, but never both at the same time.
807	 */
808	local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
809				   sizeof(struct ieee80211_tx_status_rtap_hdr));
810
811	debugfs_hw_add(local);
812
813	if (local->hw.max_listen_interval == 0)
814		local->hw.max_listen_interval = 1;
815
816	local->hw.conf.listen_interval = local->hw.max_listen_interval;
817
818	result = sta_info_start(local);
819	if (result < 0)
820		goto fail_sta_info;
821
822	result = ieee80211_wep_init(local);
823	if (result < 0) {
824		printk(KERN_DEBUG "%s: Failed to initialize wep: %d\n",
825		       wiphy_name(local->hw.wiphy), result);
826		goto fail_wep;
827	}
828
829	rtnl_lock();
830
831	result = ieee80211_init_rate_ctrl_alg(local,
832					      hw->rate_control_algorithm);
833	if (result < 0) {
834		printk(KERN_DEBUG "%s: Failed to initialize rate control "
835		       "algorithm\n", wiphy_name(local->hw.wiphy));
836		goto fail_rate;
837	}
838
839	/* add one default STA interface if supported */
840	if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
841		result = ieee80211_if_add(local, "wlan%d", NULL,
842					  NL80211_IFTYPE_STATION, NULL);
843		if (result)
844			printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
845			       wiphy_name(local->hw.wiphy));
846	}
847
848	rtnl_unlock();
849
850	ieee80211_led_init(local);
851
852	/* alloc internal scan request */
853	i = 0;
854	local->int_scan_req.ssids = &local->scan_ssid;
855	local->int_scan_req.n_ssids = 1;
856	for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
857		if (!hw->wiphy->bands[band])
858			continue;
859		for (j = 0; j < hw->wiphy->bands[band]->n_channels; j++) {
860			local->int_scan_req.channels[i] =
861				&hw->wiphy->bands[band]->channels[j];
862			i++;
863		}
864	}
865
866	local->network_latency_notifier.notifier_call =
867		ieee80211_max_network_latency;
868	result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
869				     &local->network_latency_notifier);
870
871	if (result) {
872		rtnl_lock();
873		goto fail_pm_qos;
874	}
875
876	return 0;
877
878 fail_pm_qos:
879	ieee80211_led_exit(local);
880	ieee80211_remove_interfaces(local);
881 fail_rate:
882	rtnl_unlock();
883	ieee80211_wep_free(local);
884 fail_wep:
885	sta_info_stop(local);
886 fail_sta_info:
887	debugfs_hw_del(local);
888	destroy_workqueue(local->hw.workqueue);
889 fail_workqueue:
890	wiphy_unregister(local->hw.wiphy);
891 fail_wiphy_register:
892	kfree(local->int_scan_req.channels);
893	return result;
894}
895EXPORT_SYMBOL(ieee80211_register_hw);
896
897void ieee80211_unregister_hw(struct ieee80211_hw *hw)
898{
899	struct ieee80211_local *local = hw_to_local(hw);
900
901	tasklet_kill(&local->tx_pending_tasklet);
902	tasklet_kill(&local->tasklet);
903
904	pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
905			       &local->network_latency_notifier);
906
907	rtnl_lock();
908
909	/*
910	 * At this point, interface list manipulations are fine
911	 * because the driver cannot be handing us frames any
912	 * more and the tasklet is killed.
913	 */
914	ieee80211_remove_interfaces(local);
915
916	rtnl_unlock();
917
918	ieee80211_clear_tx_pending(local);
919	sta_info_stop(local);
920	rate_control_deinitialize(local);
921	debugfs_hw_del(local);
922
923	if (skb_queue_len(&local->skb_queue)
924			|| skb_queue_len(&local->skb_queue_unreliable))
925		printk(KERN_WARNING "%s: skb_queue not empty\n",
926		       wiphy_name(local->hw.wiphy));
927	skb_queue_purge(&local->skb_queue);
928	skb_queue_purge(&local->skb_queue_unreliable);
929
930	destroy_workqueue(local->hw.workqueue);
931	wiphy_unregister(local->hw.wiphy);
932	ieee80211_wep_free(local);
933	ieee80211_led_exit(local);
934	kfree(local->int_scan_req.channels);
935}
936EXPORT_SYMBOL(ieee80211_unregister_hw);
937
938void ieee80211_free_hw(struct ieee80211_hw *hw)
939{
940	struct ieee80211_local *local = hw_to_local(hw);
941
942	mutex_destroy(&local->iflist_mtx);
943	mutex_destroy(&local->scan_mtx);
944
945	wiphy_free(local->hw.wiphy);
946}
947EXPORT_SYMBOL(ieee80211_free_hw);
948
949static int __init ieee80211_init(void)
950{
951	struct sk_buff *skb;
952	int ret;
953
954	BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
955	BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
956		     IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
957
958	ret = rc80211_minstrel_init();
959	if (ret)
960		return ret;
961
962	ret = rc80211_pid_init();
963	if (ret)
964		return ret;
965
966	ieee80211_debugfs_netdev_init();
967
968	return 0;
969}
970
971static void __exit ieee80211_exit(void)
972{
973	rc80211_pid_exit();
974	rc80211_minstrel_exit();
975
976	/*
977	 * For key todo, it'll be empty by now but the work
978	 * might still be scheduled.
979	 */
980	flush_scheduled_work();
981
982	if (mesh_allocated)
983		ieee80211s_stop();
984
985	ieee80211_debugfs_netdev_exit();
986}
987
988
989subsys_initcall(ieee80211_init);
990module_exit(ieee80211_exit);
991
992MODULE_DESCRIPTION("IEEE 802.11 subsystem");
993MODULE_LICENSE("GPL");
994