main.c revision 97af743207466ff8b477e14bfb7af0ba2c93375b 
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->quiescing || !netif_running(sdata->dev) ||
202		    test_bit(SCAN_SW_SCANNING, &local->scanning)) {
203			sdata->vif.bss_conf.enable_beacon = false;
204		} else {
205			/*
206			 * Beacon should be enabled, but AP mode must
207			 * check whether there is a beacon configured.
208			 */
209			switch (sdata->vif.type) {
210			case NL80211_IFTYPE_AP:
211				sdata->vif.bss_conf.enable_beacon =
212					!!rcu_dereference(sdata->u.ap.beacon);
213				break;
214			case NL80211_IFTYPE_ADHOC:
215				sdata->vif.bss_conf.enable_beacon =
216					!!rcu_dereference(sdata->u.ibss.presp);
217				break;
218			case NL80211_IFTYPE_MESH_POINT:
219				sdata->vif.bss_conf.enable_beacon = true;
220				break;
221			default:
222				/* not reached */
223				WARN_ON(1);
224				break;
225			}
226		}
227	}
228
229	drv_bss_info_changed(local, &sdata->vif,
230			     &sdata->vif.bss_conf, changed);
231
232	/* DEPRECATED */
233	local->hw.conf.beacon_int = sdata->vif.bss_conf.beacon_int;
234}
235
236u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
237{
238	sdata->vif.bss_conf.use_cts_prot = false;
239	sdata->vif.bss_conf.use_short_preamble = false;
240	sdata->vif.bss_conf.use_short_slot = false;
241	return BSS_CHANGED_ERP_CTS_PROT |
242	       BSS_CHANGED_ERP_PREAMBLE |
243	       BSS_CHANGED_ERP_SLOT;
244}
245
246void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
247				 struct sk_buff *skb)
248{
249	struct ieee80211_local *local = hw_to_local(hw);
250	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
251	int tmp;
252
253	skb->pkt_type = IEEE80211_TX_STATUS_MSG;
254	skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ?
255		       &local->skb_queue : &local->skb_queue_unreliable, skb);
256	tmp = skb_queue_len(&local->skb_queue) +
257		skb_queue_len(&local->skb_queue_unreliable);
258	while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
259	       (skb = skb_dequeue(&local->skb_queue_unreliable))) {
260		dev_kfree_skb_irq(skb);
261		tmp--;
262		I802_DEBUG_INC(local->tx_status_drop);
263	}
264	tasklet_schedule(&local->tasklet);
265}
266EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
267
268static void ieee80211_tasklet_handler(unsigned long data)
269{
270	struct ieee80211_local *local = (struct ieee80211_local *) data;
271	struct sk_buff *skb;
272	struct ieee80211_ra_tid *ra_tid;
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		case IEEE80211_DELBA_MSG:
288			ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
289			ieee80211_stop_tx_ba_cb(local_to_hw(local),
290						ra_tid->ra, ra_tid->tid);
291			dev_kfree_skb(skb);
292			break;
293		case IEEE80211_ADDBA_MSG:
294			ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
295			ieee80211_start_tx_ba_cb(local_to_hw(local),
296						 ra_tid->ra, ra_tid->tid);
297			dev_kfree_skb(skb);
298			break ;
299		default:
300			WARN(1, "mac80211: Packet is of unknown type %d\n",
301			     skb->pkt_type);
302			dev_kfree_skb(skb);
303			break;
304		}
305	}
306}
307
308static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
309					    struct sta_info *sta,
310					    struct sk_buff *skb)
311{
312	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
313
314	/*
315	 * XXX: This is temporary!
316	 *
317	 *	The problem here is that when we get here, the driver will
318	 *	quite likely have pretty much overwritten info->control by
319	 *	using info->driver_data or info->rate_driver_data. Thus,
320	 *	when passing out the frame to the driver again, we would be
321	 *	passing completely bogus data since the driver would then
322	 *	expect a properly filled info->control. In mac80211 itself
323	 *	the same problem occurs, since we need info->control.vif
324	 *	internally.
325	 *
326	 *	To fix this, we should send the frame through TX processing
327	 *	again. However, it's not that simple, since the frame will
328	 *	have been software-encrypted (if applicable) already, and
329	 *	encrypting it again doesn't do much good. So to properly do
330	 *	that, we not only have to skip the actual 'raw' encryption
331	 *	(key selection etc. still has to be done!) but also the
332	 *	sequence number assignment since that impacts the crypto
333	 *	encapsulation, of course.
334	 *
335	 *	Hence, for now, fix the bug by just dropping the frame.
336	 */
337	goto drop;
338
339	sta->tx_filtered_count++;
340
341	/*
342	 * Clear the TX filter mask for this STA when sending the next
343	 * packet. If the STA went to power save mode, this will happen
344	 * when it wakes up for the next time.
345	 */
346	set_sta_flags(sta, WLAN_STA_CLEAR_PS_FILT);
347
348	/*
349	 * This code races in the following way:
350	 *
351	 *  (1) STA sends frame indicating it will go to sleep and does so
352	 *  (2) hardware/firmware adds STA to filter list, passes frame up
353	 *  (3) hardware/firmware processes TX fifo and suppresses a frame
354	 *  (4) we get TX status before having processed the frame and
355	 *	knowing that the STA has gone to sleep.
356	 *
357	 * This is actually quite unlikely even when both those events are
358	 * processed from interrupts coming in quickly after one another or
359	 * even at the same time because we queue both TX status events and
360	 * RX frames to be processed by a tasklet and process them in the
361	 * same order that they were received or TX status last. Hence, there
362	 * is no race as long as the frame RX is processed before the next TX
363	 * status, which drivers can ensure, see below.
364	 *
365	 * Note that this can only happen if the hardware or firmware can
366	 * actually add STAs to the filter list, if this is done by the
367	 * driver in response to set_tim() (which will only reduce the race
368	 * this whole filtering tries to solve, not completely solve it)
369	 * this situation cannot happen.
370	 *
371	 * To completely solve this race drivers need to make sure that they
372	 *  (a) don't mix the irq-safe/not irq-safe TX status/RX processing
373	 *	functions and
374	 *  (b) always process RX events before TX status events if ordering
375	 *      can be unknown, for example with different interrupt status
376	 *	bits.
377	 */
378	if (test_sta_flags(sta, WLAN_STA_PS) &&
379	    skb_queue_len(&sta->tx_filtered) < STA_MAX_TX_BUFFER) {
380		skb_queue_tail(&sta->tx_filtered, skb);
381		return;
382	}
383
384	if (!test_sta_flags(sta, WLAN_STA_PS) &&
385	    !(info->flags & IEEE80211_TX_INTFL_RETRIED)) {
386		/* Software retry the packet once */
387		info->flags |= IEEE80211_TX_INTFL_RETRIED;
388		ieee80211_add_pending_skb(local, skb);
389		return;
390	}
391
392 drop:
393#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
394	if (net_ratelimit())
395		printk(KERN_DEBUG "%s: dropped TX filtered frame, "
396		       "queue_len=%d PS=%d @%lu\n",
397		       wiphy_name(local->hw.wiphy),
398		       skb_queue_len(&sta->tx_filtered),
399		       !!test_sta_flags(sta, WLAN_STA_PS), jiffies);
400#endif
401	dev_kfree_skb(skb);
402}
403
404void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
405{
406	struct sk_buff *skb2;
407	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
408	struct ieee80211_local *local = hw_to_local(hw);
409	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
410	u16 frag, type;
411	__le16 fc;
412	struct ieee80211_supported_band *sband;
413	struct ieee80211_tx_status_rtap_hdr *rthdr;
414	struct ieee80211_sub_if_data *sdata;
415	struct net_device *prev_dev = NULL;
416	struct sta_info *sta;
417	int retry_count = -1, i;
418
419	for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
420		/* the HW cannot have attempted that rate */
421		if (i >= hw->max_rates) {
422			info->status.rates[i].idx = -1;
423			info->status.rates[i].count = 0;
424		}
425
426		retry_count += info->status.rates[i].count;
427	}
428	if (retry_count < 0)
429		retry_count = 0;
430
431	rcu_read_lock();
432
433	sband = local->hw.wiphy->bands[info->band];
434
435	sta = sta_info_get(local, hdr->addr1);
436
437	if (sta) {
438		if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
439		    test_sta_flags(sta, WLAN_STA_PS)) {
440			/*
441			 * The STA is in power save mode, so assume
442			 * that this TX packet failed because of that.
443			 */
444			ieee80211_handle_filtered_frame(local, sta, skb);
445			rcu_read_unlock();
446			return;
447		}
448
449		fc = hdr->frame_control;
450
451		if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
452		    (ieee80211_is_data_qos(fc))) {
453			u16 tid, ssn;
454			u8 *qc;
455
456			qc = ieee80211_get_qos_ctl(hdr);
457			tid = qc[0] & 0xf;
458			ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
459						& IEEE80211_SCTL_SEQ);
460			ieee80211_send_bar(sta->sdata, hdr->addr1,
461					   tid, ssn);
462		}
463
464		if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
465			ieee80211_handle_filtered_frame(local, sta, skb);
466			rcu_read_unlock();
467			return;
468		} else {
469			if (!(info->flags & IEEE80211_TX_STAT_ACK))
470				sta->tx_retry_failed++;
471			sta->tx_retry_count += retry_count;
472		}
473
474		rate_control_tx_status(local, sband, sta, skb);
475	}
476
477	rcu_read_unlock();
478
479	ieee80211_led_tx(local, 0);
480
481	/* SNMP counters
482	 * Fragments are passed to low-level drivers as separate skbs, so these
483	 * are actually fragments, not frames. Update frame counters only for
484	 * the first fragment of the frame. */
485
486	frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG;
487	type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE;
488
489	if (info->flags & IEEE80211_TX_STAT_ACK) {
490		if (frag == 0) {
491			local->dot11TransmittedFrameCount++;
492			if (is_multicast_ether_addr(hdr->addr1))
493				local->dot11MulticastTransmittedFrameCount++;
494			if (retry_count > 0)
495				local->dot11RetryCount++;
496			if (retry_count > 1)
497				local->dot11MultipleRetryCount++;
498		}
499
500		/* This counter shall be incremented for an acknowledged MPDU
501		 * with an individual address in the address 1 field or an MPDU
502		 * with a multicast address in the address 1 field of type Data
503		 * or Management. */
504		if (!is_multicast_ether_addr(hdr->addr1) ||
505		    type == IEEE80211_FTYPE_DATA ||
506		    type == IEEE80211_FTYPE_MGMT)
507			local->dot11TransmittedFragmentCount++;
508	} else {
509		if (frag == 0)
510			local->dot11FailedCount++;
511	}
512
513	/* this was a transmitted frame, but now we want to reuse it */
514	skb_orphan(skb);
515
516	/*
517	 * This is a bit racy but we can avoid a lot of work
518	 * with this test...
519	 */
520	if (!local->monitors && !local->cooked_mntrs) {
521		dev_kfree_skb(skb);
522		return;
523	}
524
525	/* send frame to monitor interfaces now */
526
527	if (skb_headroom(skb) < sizeof(*rthdr)) {
528		printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
529		dev_kfree_skb(skb);
530		return;
531	}
532
533	rthdr = (struct ieee80211_tx_status_rtap_hdr *)
534				skb_push(skb, sizeof(*rthdr));
535
536	memset(rthdr, 0, sizeof(*rthdr));
537	rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
538	rthdr->hdr.it_present =
539		cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
540			    (1 << IEEE80211_RADIOTAP_DATA_RETRIES) |
541			    (1 << IEEE80211_RADIOTAP_RATE));
542
543	if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
544	    !is_multicast_ether_addr(hdr->addr1))
545		rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL);
546
547	/*
548	 * XXX: Once radiotap gets the bitmap reset thing the vendor
549	 *	extensions proposal contains, we can actually report
550	 *	the whole set of tries we did.
551	 */
552	if ((info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) ||
553	    (info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT))
554		rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS);
555	else if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS)
556		rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS);
557	if (info->status.rates[0].idx >= 0 &&
558	    !(info->status.rates[0].flags & IEEE80211_TX_RC_MCS))
559		rthdr->rate = sband->bitrates[
560				info->status.rates[0].idx].bitrate / 5;
561
562	/* for now report the total retry_count */
563	rthdr->data_retries = retry_count;
564
565	/* XXX: is this sufficient for BPF? */
566	skb_set_mac_header(skb, 0);
567	skb->ip_summed = CHECKSUM_UNNECESSARY;
568	skb->pkt_type = PACKET_OTHERHOST;
569	skb->protocol = htons(ETH_P_802_2);
570	memset(skb->cb, 0, sizeof(skb->cb));
571
572	rcu_read_lock();
573	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
574		if (sdata->vif.type == NL80211_IFTYPE_MONITOR) {
575			if (!netif_running(sdata->dev))
576				continue;
577
578			if (prev_dev) {
579				skb2 = skb_clone(skb, GFP_ATOMIC);
580				if (skb2) {
581					skb2->dev = prev_dev;
582					netif_rx(skb2);
583				}
584			}
585
586			prev_dev = sdata->dev;
587		}
588	}
589	if (prev_dev) {
590		skb->dev = prev_dev;
591		netif_rx(skb);
592		skb = NULL;
593	}
594	rcu_read_unlock();
595	dev_kfree_skb(skb);
596}
597EXPORT_SYMBOL(ieee80211_tx_status);
598
599static void ieee80211_restart_work(struct work_struct *work)
600{
601	struct ieee80211_local *local =
602		container_of(work, struct ieee80211_local, restart_work);
603
604	rtnl_lock();
605	ieee80211_reconfig(local);
606	rtnl_unlock();
607}
608
609void ieee80211_restart_hw(struct ieee80211_hw *hw)
610{
611	struct ieee80211_local *local = hw_to_local(hw);
612
613	/* use this reason, __ieee80211_resume will unblock it */
614	ieee80211_stop_queues_by_reason(hw,
615		IEEE80211_QUEUE_STOP_REASON_SUSPEND);
616
617	schedule_work(&local->restart_work);
618}
619EXPORT_SYMBOL(ieee80211_restart_hw);
620
621struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
622					const struct ieee80211_ops *ops)
623{
624	struct ieee80211_local *local;
625	int priv_size, i;
626	struct wiphy *wiphy;
627
628	/* Ensure 32-byte alignment of our private data and hw private data.
629	 * We use the wiphy priv data for both our ieee80211_local and for
630	 * the driver's private data
631	 *
632	 * In memory it'll be like this:
633	 *
634	 * +-------------------------+
635	 * | struct wiphy	    |
636	 * +-------------------------+
637	 * | struct ieee80211_local  |
638	 * +-------------------------+
639	 * | driver's private data   |
640	 * +-------------------------+
641	 *
642	 */
643	priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
644
645	wiphy = wiphy_new(&mac80211_config_ops, priv_size);
646
647	if (!wiphy)
648		return NULL;
649
650	wiphy->netnsok = true;
651	wiphy->privid = mac80211_wiphy_privid;
652
653	/* Yes, putting cfg80211_bss into ieee80211_bss is a hack */
654	wiphy->bss_priv_size = sizeof(struct ieee80211_bss) -
655			       sizeof(struct cfg80211_bss);
656
657	local = wiphy_priv(wiphy);
658
659	local->hw.wiphy = wiphy;
660
661	local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
662
663	BUG_ON(!ops->tx);
664	BUG_ON(!ops->start);
665	BUG_ON(!ops->stop);
666	BUG_ON(!ops->config);
667	BUG_ON(!ops->add_interface);
668	BUG_ON(!ops->remove_interface);
669	BUG_ON(!ops->configure_filter);
670	local->ops = ops;
671
672	/* set up some defaults */
673	local->hw.queues = 1;
674	local->hw.max_rates = 1;
675	local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
676	local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
677	local->hw.conf.radio_enabled = true;
678	local->user_power_level = -1;
679
680	INIT_LIST_HEAD(&local->interfaces);
681	mutex_init(&local->iflist_mtx);
682	mutex_init(&local->scan_mtx);
683
684	spin_lock_init(&local->key_lock);
685	spin_lock_init(&local->filter_lock);
686	spin_lock_init(&local->queue_stop_reason_lock);
687
688	INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
689
690	INIT_WORK(&local->restart_work, ieee80211_restart_work);
691
692	INIT_WORK(&local->dynamic_ps_enable_work,
693		  ieee80211_dynamic_ps_enable_work);
694	INIT_WORK(&local->dynamic_ps_disable_work,
695		  ieee80211_dynamic_ps_disable_work);
696	setup_timer(&local->dynamic_ps_timer,
697		    ieee80211_dynamic_ps_timer, (unsigned long) local);
698
699	sta_info_init(local);
700
701	for (i = 0; i < IEEE80211_MAX_QUEUES; i++)
702		skb_queue_head_init(&local->pending[i]);
703	tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
704		     (unsigned long)local);
705	tasklet_disable(&local->tx_pending_tasklet);
706
707	tasklet_init(&local->tasklet,
708		     ieee80211_tasklet_handler,
709		     (unsigned long) local);
710	tasklet_disable(&local->tasklet);
711
712	skb_queue_head_init(&local->skb_queue);
713	skb_queue_head_init(&local->skb_queue_unreliable);
714
715	spin_lock_init(&local->ampdu_lock);
716
717	return local_to_hw(local);
718}
719EXPORT_SYMBOL(ieee80211_alloc_hw);
720
721int ieee80211_register_hw(struct ieee80211_hw *hw)
722{
723	struct ieee80211_local *local = hw_to_local(hw);
724	int result;
725	enum ieee80211_band band;
726	int channels, i, j, max_bitrates;
727	bool supp_ht;
728	static const u32 cipher_suites[] = {
729		WLAN_CIPHER_SUITE_WEP40,
730		WLAN_CIPHER_SUITE_WEP104,
731		WLAN_CIPHER_SUITE_TKIP,
732		WLAN_CIPHER_SUITE_CCMP,
733
734		/* keep last -- depends on hw flags! */
735		WLAN_CIPHER_SUITE_AES_CMAC
736	};
737
738	/*
739	 * generic code guarantees at least one band,
740	 * set this very early because much code assumes
741	 * that hw.conf.channel is assigned
742	 */
743	channels = 0;
744	max_bitrates = 0;
745	supp_ht = false;
746	for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
747		struct ieee80211_supported_band *sband;
748
749		sband = local->hw.wiphy->bands[band];
750		if (!sband)
751			continue;
752		if (!local->oper_channel) {
753			/* init channel we're on */
754			local->hw.conf.channel =
755			local->oper_channel = &sband->channels[0];
756			local->hw.conf.channel_type = NL80211_CHAN_NO_HT;
757		}
758		channels += sband->n_channels;
759
760		if (max_bitrates < sband->n_bitrates)
761			max_bitrates = sband->n_bitrates;
762		supp_ht = supp_ht || sband->ht_cap.ht_supported;
763	}
764
765	local->int_scan_req.n_channels = channels;
766	local->int_scan_req.channels = kzalloc(sizeof(void *) * channels, GFP_KERNEL);
767	if (!local->int_scan_req.channels)
768		return -ENOMEM;
769
770	/* if low-level driver supports AP, we also support VLAN */
771	if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP))
772		local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
773
774	/* mac80211 always supports monitor */
775	local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
776
777	if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
778		local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
779	else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
780		local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
781
782	/*
783	 * Calculate scan IE length -- we need this to alloc
784	 * memory and to subtract from the driver limit. It
785	 * includes the (extended) supported rates and HT
786	 * information -- SSID is the driver's responsibility.
787	 */
788	local->scan_ies_len = 4 + max_bitrates; /* (ext) supp rates */
789	if (supp_ht)
790		local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
791
792	if (!local->ops->hw_scan) {
793		/* For hw_scan, driver needs to set these up. */
794		local->hw.wiphy->max_scan_ssids = 4;
795		local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
796	}
797
798	/*
799	 * If the driver supports any scan IEs, then assume the
800	 * limit includes the IEs mac80211 will add, otherwise
801	 * leave it at zero and let the driver sort it out; we
802	 * still pass our IEs to the driver but userspace will
803	 * not be allowed to in that case.
804	 */
805	if (local->hw.wiphy->max_scan_ie_len)
806		local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
807
808	local->hw.wiphy->cipher_suites = cipher_suites;
809	local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
810	if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
811		local->hw.wiphy->n_cipher_suites--;
812
813	result = wiphy_register(local->hw.wiphy);
814	if (result < 0)
815		goto fail_wiphy_register;
816
817	/*
818	 * We use the number of queues for feature tests (QoS, HT) internally
819	 * so restrict them appropriately.
820	 */
821	if (hw->queues > IEEE80211_MAX_QUEUES)
822		hw->queues = IEEE80211_MAX_QUEUES;
823
824	local->hw.workqueue =
825		create_singlethread_workqueue(wiphy_name(local->hw.wiphy));
826	if (!local->hw.workqueue) {
827		result = -ENOMEM;
828		goto fail_workqueue;
829	}
830
831	/*
832	 * The hardware needs headroom for sending the frame,
833	 * and we need some headroom for passing the frame to monitor
834	 * interfaces, but never both at the same time.
835	 */
836	local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
837				   sizeof(struct ieee80211_tx_status_rtap_hdr));
838
839	debugfs_hw_add(local);
840
841	if (local->hw.max_listen_interval == 0)
842		local->hw.max_listen_interval = 1;
843
844	local->hw.conf.listen_interval = local->hw.max_listen_interval;
845
846	result = sta_info_start(local);
847	if (result < 0)
848		goto fail_sta_info;
849
850	result = ieee80211_wep_init(local);
851	if (result < 0) {
852		printk(KERN_DEBUG "%s: Failed to initialize wep: %d\n",
853		       wiphy_name(local->hw.wiphy), result);
854		goto fail_wep;
855	}
856
857	rtnl_lock();
858
859	result = ieee80211_init_rate_ctrl_alg(local,
860					      hw->rate_control_algorithm);
861	if (result < 0) {
862		printk(KERN_DEBUG "%s: Failed to initialize rate control "
863		       "algorithm\n", wiphy_name(local->hw.wiphy));
864		goto fail_rate;
865	}
866
867	/* add one default STA interface if supported */
868	if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
869		result = ieee80211_if_add(local, "wlan%d", NULL,
870					  NL80211_IFTYPE_STATION, NULL);
871		if (result)
872			printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
873			       wiphy_name(local->hw.wiphy));
874	}
875
876	rtnl_unlock();
877
878	ieee80211_led_init(local);
879
880	/* alloc internal scan request */
881	i = 0;
882	local->int_scan_req.ssids = &local->scan_ssid;
883	local->int_scan_req.n_ssids = 1;
884	for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
885		if (!hw->wiphy->bands[band])
886			continue;
887		for (j = 0; j < hw->wiphy->bands[band]->n_channels; j++) {
888			local->int_scan_req.channels[i] =
889				&hw->wiphy->bands[band]->channels[j];
890			i++;
891		}
892	}
893
894	local->network_latency_notifier.notifier_call =
895		ieee80211_max_network_latency;
896	result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
897				     &local->network_latency_notifier);
898
899	if (result) {
900		rtnl_lock();
901		goto fail_pm_qos;
902	}
903
904	return 0;
905
906 fail_pm_qos:
907	ieee80211_led_exit(local);
908	ieee80211_remove_interfaces(local);
909 fail_rate:
910	rtnl_unlock();
911	ieee80211_wep_free(local);
912 fail_wep:
913	sta_info_stop(local);
914 fail_sta_info:
915	debugfs_hw_del(local);
916	destroy_workqueue(local->hw.workqueue);
917 fail_workqueue:
918	wiphy_unregister(local->hw.wiphy);
919 fail_wiphy_register:
920	kfree(local->int_scan_req.channels);
921	return result;
922}
923EXPORT_SYMBOL(ieee80211_register_hw);
924
925void ieee80211_unregister_hw(struct ieee80211_hw *hw)
926{
927	struct ieee80211_local *local = hw_to_local(hw);
928
929	tasklet_kill(&local->tx_pending_tasklet);
930	tasklet_kill(&local->tasklet);
931
932	pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
933			       &local->network_latency_notifier);
934
935	rtnl_lock();
936
937	/*
938	 * At this point, interface list manipulations are fine
939	 * because the driver cannot be handing us frames any
940	 * more and the tasklet is killed.
941	 */
942	ieee80211_remove_interfaces(local);
943
944	rtnl_unlock();
945
946	ieee80211_clear_tx_pending(local);
947	sta_info_stop(local);
948	rate_control_deinitialize(local);
949	debugfs_hw_del(local);
950
951	if (skb_queue_len(&local->skb_queue)
952			|| skb_queue_len(&local->skb_queue_unreliable))
953		printk(KERN_WARNING "%s: skb_queue not empty\n",
954		       wiphy_name(local->hw.wiphy));
955	skb_queue_purge(&local->skb_queue);
956	skb_queue_purge(&local->skb_queue_unreliable);
957
958	destroy_workqueue(local->hw.workqueue);
959	wiphy_unregister(local->hw.wiphy);
960	ieee80211_wep_free(local);
961	ieee80211_led_exit(local);
962	kfree(local->int_scan_req.channels);
963}
964EXPORT_SYMBOL(ieee80211_unregister_hw);
965
966void ieee80211_free_hw(struct ieee80211_hw *hw)
967{
968	struct ieee80211_local *local = hw_to_local(hw);
969
970	mutex_destroy(&local->iflist_mtx);
971	mutex_destroy(&local->scan_mtx);
972
973	wiphy_free(local->hw.wiphy);
974}
975EXPORT_SYMBOL(ieee80211_free_hw);
976
977static int __init ieee80211_init(void)
978{
979	struct sk_buff *skb;
980	int ret;
981
982	BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
983	BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
984		     IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
985
986	ret = rc80211_minstrel_init();
987	if (ret)
988		return ret;
989
990	ret = rc80211_pid_init();
991	if (ret)
992		return ret;
993
994	ieee80211_debugfs_netdev_init();
995
996	return 0;
997}
998
999static void __exit ieee80211_exit(void)
1000{
1001	rc80211_pid_exit();
1002	rc80211_minstrel_exit();
1003
1004	/*
1005	 * For key todo, it'll be empty by now but the work
1006	 * might still be scheduled.
1007	 */
1008	flush_scheduled_work();
1009
1010	if (mesh_allocated)
1011		ieee80211s_stop();
1012
1013	ieee80211_debugfs_netdev_exit();
1014}
1015
1016
1017subsys_initcall(ieee80211_init);
1018module_exit(ieee80211_exit);
1019
1020MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1021MODULE_LICENSE("GPL");
1022