main.c revision 3ac64beecd27400d12cc7afb4108eef26c499f6a 
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
53void ieee80211_configure_filter(struct ieee80211_local *local)
54{
55	u64 mc;
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 || local->scanning)
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	if (local->fif_pspoll)
81		new_flags |= FIF_PSPOLL;
82
83	spin_lock_bh(&local->filter_lock);
84	changed_flags = local->filter_flags ^ new_flags;
85
86	mc = drv_prepare_multicast(local, local->mc_count, local->mc_list);
87	spin_unlock_bh(&local->filter_lock);
88
89	/* be a bit nasty */
90	new_flags |= (1<<31);
91
92	drv_configure_filter(local, changed_flags, &new_flags, mc);
93
94	WARN_ON(new_flags & (1<<31));
95
96	local->filter_flags = new_flags & ~(1<<31);
97}
98
99static void ieee80211_reconfig_filter(struct work_struct *work)
100{
101	struct ieee80211_local *local =
102		container_of(work, struct ieee80211_local, reconfig_filter);
103
104	ieee80211_configure_filter(local);
105}
106
107int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
108{
109	struct ieee80211_channel *chan, *scan_chan;
110	int ret = 0;
111	int power;
112	enum nl80211_channel_type channel_type;
113
114	might_sleep();
115
116	scan_chan = local->scan_channel;
117
118	if (scan_chan) {
119		chan = scan_chan;
120		channel_type = NL80211_CHAN_NO_HT;
121	} else {
122		chan = local->oper_channel;
123		channel_type = local->oper_channel_type;
124	}
125
126	if (chan != local->hw.conf.channel ||
127	    channel_type != local->hw.conf.channel_type) {
128		local->hw.conf.channel = chan;
129		local->hw.conf.channel_type = channel_type;
130		changed |= IEEE80211_CONF_CHANGE_CHANNEL;
131	}
132
133	if (scan_chan)
134		power = chan->max_power;
135	else
136		power = local->power_constr_level ?
137			(chan->max_power - local->power_constr_level) :
138			chan->max_power;
139
140	if (local->user_power_level >= 0)
141		power = min(power, local->user_power_level);
142
143	if (local->hw.conf.power_level != power) {
144		changed |= IEEE80211_CONF_CHANGE_POWER;
145		local->hw.conf.power_level = power;
146	}
147
148	if (changed && local->open_count) {
149		ret = drv_config(local, changed);
150		/*
151		 * Goal:
152		 * HW reconfiguration should never fail, the driver has told
153		 * us what it can support so it should live up to that promise.
154		 *
155		 * Current status:
156		 * rfkill is not integrated with mac80211 and a
157		 * configuration command can thus fail if hardware rfkill
158		 * is enabled
159		 *
160		 * FIXME: integrate rfkill with mac80211 and then add this
161		 * WARN_ON() back
162		 *
163		 */
164		/* WARN_ON(ret); */
165	}
166
167	return ret;
168}
169
170void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
171				      u32 changed)
172{
173	struct ieee80211_local *local = sdata->local;
174	static const u8 zero[ETH_ALEN] = { 0 };
175
176	if (!changed)
177		return;
178
179	if (sdata->vif.type == NL80211_IFTYPE_STATION) {
180		/*
181		 * While not associated, claim a BSSID of all-zeroes
182		 * so that drivers don't do any weird things with the
183		 * BSSID at that time.
184		 */
185		if (sdata->vif.bss_conf.assoc)
186			sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
187		else
188			sdata->vif.bss_conf.bssid = zero;
189	} else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
190		sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
191	else if (sdata->vif.type == NL80211_IFTYPE_AP)
192		sdata->vif.bss_conf.bssid = sdata->dev->dev_addr;
193	else if (ieee80211_vif_is_mesh(&sdata->vif)) {
194		sdata->vif.bss_conf.bssid = zero;
195	} else {
196		WARN_ON(1);
197		return;
198	}
199
200	switch (sdata->vif.type) {
201	case NL80211_IFTYPE_AP:
202	case NL80211_IFTYPE_ADHOC:
203	case NL80211_IFTYPE_MESH_POINT:
204		break;
205	default:
206		/* do not warn to simplify caller in scan.c */
207		changed &= ~BSS_CHANGED_BEACON_ENABLED;
208		if (WARN_ON(changed & BSS_CHANGED_BEACON))
209			return;
210		break;
211	}
212
213	if (changed & BSS_CHANGED_BEACON_ENABLED) {
214		if (local->quiescing || !netif_running(sdata->dev) ||
215		    test_bit(SCAN_SW_SCANNING, &local->scanning)) {
216			sdata->vif.bss_conf.enable_beacon = false;
217		} else {
218			/*
219			 * Beacon should be enabled, but AP mode must
220			 * check whether there is a beacon configured.
221			 */
222			switch (sdata->vif.type) {
223			case NL80211_IFTYPE_AP:
224				sdata->vif.bss_conf.enable_beacon =
225					!!rcu_dereference(sdata->u.ap.beacon);
226				break;
227			case NL80211_IFTYPE_ADHOC:
228				sdata->vif.bss_conf.enable_beacon =
229					!!rcu_dereference(sdata->u.ibss.presp);
230				break;
231			case NL80211_IFTYPE_MESH_POINT:
232				sdata->vif.bss_conf.enable_beacon = true;
233				break;
234			default:
235				/* not reached */
236				WARN_ON(1);
237				break;
238			}
239		}
240	}
241
242	drv_bss_info_changed(local, &sdata->vif,
243			     &sdata->vif.bss_conf, changed);
244
245	/* DEPRECATED */
246	local->hw.conf.beacon_int = sdata->vif.bss_conf.beacon_int;
247}
248
249u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
250{
251	sdata->vif.bss_conf.use_cts_prot = false;
252	sdata->vif.bss_conf.use_short_preamble = false;
253	sdata->vif.bss_conf.use_short_slot = false;
254	return BSS_CHANGED_ERP_CTS_PROT |
255	       BSS_CHANGED_ERP_PREAMBLE |
256	       BSS_CHANGED_ERP_SLOT;
257}
258
259void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
260				 struct sk_buff *skb)
261{
262	struct ieee80211_local *local = hw_to_local(hw);
263	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
264	int tmp;
265
266	skb->pkt_type = IEEE80211_TX_STATUS_MSG;
267	skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ?
268		       &local->skb_queue : &local->skb_queue_unreliable, skb);
269	tmp = skb_queue_len(&local->skb_queue) +
270		skb_queue_len(&local->skb_queue_unreliable);
271	while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
272	       (skb = skb_dequeue(&local->skb_queue_unreliable))) {
273		dev_kfree_skb_irq(skb);
274		tmp--;
275		I802_DEBUG_INC(local->tx_status_drop);
276	}
277	tasklet_schedule(&local->tasklet);
278}
279EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
280
281static void ieee80211_tasklet_handler(unsigned long data)
282{
283	struct ieee80211_local *local = (struct ieee80211_local *) data;
284	struct sk_buff *skb;
285	struct ieee80211_ra_tid *ra_tid;
286
287	while ((skb = skb_dequeue(&local->skb_queue)) ||
288	       (skb = skb_dequeue(&local->skb_queue_unreliable))) {
289		switch (skb->pkt_type) {
290		case IEEE80211_RX_MSG:
291			/* Clear skb->pkt_type in order to not confuse kernel
292			 * netstack. */
293			skb->pkt_type = 0;
294			ieee80211_rx(local_to_hw(local), skb);
295			break;
296		case IEEE80211_TX_STATUS_MSG:
297			skb->pkt_type = 0;
298			ieee80211_tx_status(local_to_hw(local), skb);
299			break;
300		case IEEE80211_DELBA_MSG:
301			ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
302			ieee80211_stop_tx_ba_cb(local_to_hw(local),
303						ra_tid->ra, ra_tid->tid);
304			dev_kfree_skb(skb);
305			break;
306		case IEEE80211_ADDBA_MSG:
307			ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
308			ieee80211_start_tx_ba_cb(local_to_hw(local),
309						 ra_tid->ra, ra_tid->tid);
310			dev_kfree_skb(skb);
311			break ;
312		default:
313			WARN(1, "mac80211: Packet is of unknown type %d\n",
314			     skb->pkt_type);
315			dev_kfree_skb(skb);
316			break;
317		}
318	}
319}
320
321static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
322					    struct sta_info *sta,
323					    struct sk_buff *skb)
324{
325	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
326
327	/*
328	 * XXX: This is temporary!
329	 *
330	 *	The problem here is that when we get here, the driver will
331	 *	quite likely have pretty much overwritten info->control by
332	 *	using info->driver_data or info->rate_driver_data. Thus,
333	 *	when passing out the frame to the driver again, we would be
334	 *	passing completely bogus data since the driver would then
335	 *	expect a properly filled info->control. In mac80211 itself
336	 *	the same problem occurs, since we need info->control.vif
337	 *	internally.
338	 *
339	 *	To fix this, we should send the frame through TX processing
340	 *	again. However, it's not that simple, since the frame will
341	 *	have been software-encrypted (if applicable) already, and
342	 *	encrypting it again doesn't do much good. So to properly do
343	 *	that, we not only have to skip the actual 'raw' encryption
344	 *	(key selection etc. still has to be done!) but also the
345	 *	sequence number assignment since that impacts the crypto
346	 *	encapsulation, of course.
347	 *
348	 *	Hence, for now, fix the bug by just dropping the frame.
349	 */
350	goto drop;
351
352	sta->tx_filtered_count++;
353
354	/*
355	 * Clear the TX filter mask for this STA when sending the next
356	 * packet. If the STA went to power save mode, this will happen
357	 * when it wakes up for the next time.
358	 */
359	set_sta_flags(sta, WLAN_STA_CLEAR_PS_FILT);
360
361	/*
362	 * This code races in the following way:
363	 *
364	 *  (1) STA sends frame indicating it will go to sleep and does so
365	 *  (2) hardware/firmware adds STA to filter list, passes frame up
366	 *  (3) hardware/firmware processes TX fifo and suppresses a frame
367	 *  (4) we get TX status before having processed the frame and
368	 *	knowing that the STA has gone to sleep.
369	 *
370	 * This is actually quite unlikely even when both those events are
371	 * processed from interrupts coming in quickly after one another or
372	 * even at the same time because we queue both TX status events and
373	 * RX frames to be processed by a tasklet and process them in the
374	 * same order that they were received or TX status last. Hence, there
375	 * is no race as long as the frame RX is processed before the next TX
376	 * status, which drivers can ensure, see below.
377	 *
378	 * Note that this can only happen if the hardware or firmware can
379	 * actually add STAs to the filter list, if this is done by the
380	 * driver in response to set_tim() (which will only reduce the race
381	 * this whole filtering tries to solve, not completely solve it)
382	 * this situation cannot happen.
383	 *
384	 * To completely solve this race drivers need to make sure that they
385	 *  (a) don't mix the irq-safe/not irq-safe TX status/RX processing
386	 *	functions and
387	 *  (b) always process RX events before TX status events if ordering
388	 *      can be unknown, for example with different interrupt status
389	 *	bits.
390	 */
391	if (test_sta_flags(sta, WLAN_STA_PS) &&
392	    skb_queue_len(&sta->tx_filtered) < STA_MAX_TX_BUFFER) {
393		skb_queue_tail(&sta->tx_filtered, skb);
394		return;
395	}
396
397	if (!test_sta_flags(sta, WLAN_STA_PS) &&
398	    !(info->flags & IEEE80211_TX_INTFL_RETRIED)) {
399		/* Software retry the packet once */
400		info->flags |= IEEE80211_TX_INTFL_RETRIED;
401		ieee80211_add_pending_skb(local, skb);
402		return;
403	}
404
405 drop:
406#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
407	if (net_ratelimit())
408		printk(KERN_DEBUG "%s: dropped TX filtered frame, "
409		       "queue_len=%d PS=%d @%lu\n",
410		       wiphy_name(local->hw.wiphy),
411		       skb_queue_len(&sta->tx_filtered),
412		       !!test_sta_flags(sta, WLAN_STA_PS), jiffies);
413#endif
414	dev_kfree_skb(skb);
415}
416
417void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
418{
419	struct sk_buff *skb2;
420	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
421	struct ieee80211_local *local = hw_to_local(hw);
422	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
423	u16 frag, type;
424	__le16 fc;
425	struct ieee80211_supported_band *sband;
426	struct ieee80211_tx_status_rtap_hdr *rthdr;
427	struct ieee80211_sub_if_data *sdata;
428	struct net_device *prev_dev = NULL;
429	struct sta_info *sta;
430	int retry_count = -1, i;
431
432	for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
433		/* the HW cannot have attempted that rate */
434		if (i >= hw->max_rates) {
435			info->status.rates[i].idx = -1;
436			info->status.rates[i].count = 0;
437		}
438
439		retry_count += info->status.rates[i].count;
440	}
441	if (retry_count < 0)
442		retry_count = 0;
443
444	rcu_read_lock();
445
446	sband = local->hw.wiphy->bands[info->band];
447
448	sta = sta_info_get(local, hdr->addr1);
449
450	if (sta) {
451		if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
452		    test_sta_flags(sta, WLAN_STA_PS)) {
453			/*
454			 * The STA is in power save mode, so assume
455			 * that this TX packet failed because of that.
456			 */
457			ieee80211_handle_filtered_frame(local, sta, skb);
458			rcu_read_unlock();
459			return;
460		}
461
462		fc = hdr->frame_control;
463
464		if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
465		    (ieee80211_is_data_qos(fc))) {
466			u16 tid, ssn;
467			u8 *qc;
468
469			qc = ieee80211_get_qos_ctl(hdr);
470			tid = qc[0] & 0xf;
471			ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
472						& IEEE80211_SCTL_SEQ);
473			ieee80211_send_bar(sta->sdata, hdr->addr1,
474					   tid, ssn);
475		}
476
477		if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
478			ieee80211_handle_filtered_frame(local, sta, skb);
479			rcu_read_unlock();
480			return;
481		} else {
482			if (!(info->flags & IEEE80211_TX_STAT_ACK))
483				sta->tx_retry_failed++;
484			sta->tx_retry_count += retry_count;
485		}
486
487		rate_control_tx_status(local, sband, sta, skb);
488	}
489
490	rcu_read_unlock();
491
492	ieee80211_led_tx(local, 0);
493
494	/* SNMP counters
495	 * Fragments are passed to low-level drivers as separate skbs, so these
496	 * are actually fragments, not frames. Update frame counters only for
497	 * the first fragment of the frame. */
498
499	frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG;
500	type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE;
501
502	if (info->flags & IEEE80211_TX_STAT_ACK) {
503		if (frag == 0) {
504			local->dot11TransmittedFrameCount++;
505			if (is_multicast_ether_addr(hdr->addr1))
506				local->dot11MulticastTransmittedFrameCount++;
507			if (retry_count > 0)
508				local->dot11RetryCount++;
509			if (retry_count > 1)
510				local->dot11MultipleRetryCount++;
511		}
512
513		/* This counter shall be incremented for an acknowledged MPDU
514		 * with an individual address in the address 1 field or an MPDU
515		 * with a multicast address in the address 1 field of type Data
516		 * or Management. */
517		if (!is_multicast_ether_addr(hdr->addr1) ||
518		    type == IEEE80211_FTYPE_DATA ||
519		    type == IEEE80211_FTYPE_MGMT)
520			local->dot11TransmittedFragmentCount++;
521	} else {
522		if (frag == 0)
523			local->dot11FailedCount++;
524	}
525
526	/* this was a transmitted frame, but now we want to reuse it */
527	skb_orphan(skb);
528
529	/*
530	 * This is a bit racy but we can avoid a lot of work
531	 * with this test...
532	 */
533	if (!local->monitors && !local->cooked_mntrs) {
534		dev_kfree_skb(skb);
535		return;
536	}
537
538	/* send frame to monitor interfaces now */
539
540	if (skb_headroom(skb) < sizeof(*rthdr)) {
541		printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
542		dev_kfree_skb(skb);
543		return;
544	}
545
546	rthdr = (struct ieee80211_tx_status_rtap_hdr *)
547				skb_push(skb, sizeof(*rthdr));
548
549	memset(rthdr, 0, sizeof(*rthdr));
550	rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
551	rthdr->hdr.it_present =
552		cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
553			    (1 << IEEE80211_RADIOTAP_DATA_RETRIES) |
554			    (1 << IEEE80211_RADIOTAP_RATE));
555
556	if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
557	    !is_multicast_ether_addr(hdr->addr1))
558		rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL);
559
560	/*
561	 * XXX: Once radiotap gets the bitmap reset thing the vendor
562	 *	extensions proposal contains, we can actually report
563	 *	the whole set of tries we did.
564	 */
565	if ((info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) ||
566	    (info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT))
567		rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS);
568	else if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS)
569		rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS);
570	if (info->status.rates[0].idx >= 0 &&
571	    !(info->status.rates[0].flags & IEEE80211_TX_RC_MCS))
572		rthdr->rate = sband->bitrates[
573				info->status.rates[0].idx].bitrate / 5;
574
575	/* for now report the total retry_count */
576	rthdr->data_retries = retry_count;
577
578	/* XXX: is this sufficient for BPF? */
579	skb_set_mac_header(skb, 0);
580	skb->ip_summed = CHECKSUM_UNNECESSARY;
581	skb->pkt_type = PACKET_OTHERHOST;
582	skb->protocol = htons(ETH_P_802_2);
583	memset(skb->cb, 0, sizeof(skb->cb));
584
585	rcu_read_lock();
586	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
587		if (sdata->vif.type == NL80211_IFTYPE_MONITOR) {
588			if (!netif_running(sdata->dev))
589				continue;
590
591			if (prev_dev) {
592				skb2 = skb_clone(skb, GFP_ATOMIC);
593				if (skb2) {
594					skb2->dev = prev_dev;
595					netif_rx(skb2);
596				}
597			}
598
599			prev_dev = sdata->dev;
600		}
601	}
602	if (prev_dev) {
603		skb->dev = prev_dev;
604		netif_rx(skb);
605		skb = NULL;
606	}
607	rcu_read_unlock();
608	dev_kfree_skb(skb);
609}
610EXPORT_SYMBOL(ieee80211_tx_status);
611
612static void ieee80211_restart_work(struct work_struct *work)
613{
614	struct ieee80211_local *local =
615		container_of(work, struct ieee80211_local, restart_work);
616
617	rtnl_lock();
618	ieee80211_reconfig(local);
619	rtnl_unlock();
620}
621
622void ieee80211_restart_hw(struct ieee80211_hw *hw)
623{
624	struct ieee80211_local *local = hw_to_local(hw);
625
626	/* use this reason, __ieee80211_resume will unblock it */
627	ieee80211_stop_queues_by_reason(hw,
628		IEEE80211_QUEUE_STOP_REASON_SUSPEND);
629
630	schedule_work(&local->restart_work);
631}
632EXPORT_SYMBOL(ieee80211_restart_hw);
633
634struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
635					const struct ieee80211_ops *ops)
636{
637	struct ieee80211_local *local;
638	int priv_size, i;
639	struct wiphy *wiphy;
640
641	/* Ensure 32-byte alignment of our private data and hw private data.
642	 * We use the wiphy priv data for both our ieee80211_local and for
643	 * the driver's private data
644	 *
645	 * In memory it'll be like this:
646	 *
647	 * +-------------------------+
648	 * | struct wiphy	    |
649	 * +-------------------------+
650	 * | struct ieee80211_local  |
651	 * +-------------------------+
652	 * | driver's private data   |
653	 * +-------------------------+
654	 *
655	 */
656	priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
657
658	wiphy = wiphy_new(&mac80211_config_ops, priv_size);
659
660	if (!wiphy)
661		return NULL;
662
663	wiphy->netnsok = true;
664	wiphy->privid = mac80211_wiphy_privid;
665
666	/* Yes, putting cfg80211_bss into ieee80211_bss is a hack */
667	wiphy->bss_priv_size = sizeof(struct ieee80211_bss) -
668			       sizeof(struct cfg80211_bss);
669
670	local = wiphy_priv(wiphy);
671
672	local->hw.wiphy = wiphy;
673
674	local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
675
676	BUG_ON(!ops->tx);
677	BUG_ON(!ops->start);
678	BUG_ON(!ops->stop);
679	BUG_ON(!ops->config);
680	BUG_ON(!ops->add_interface);
681	BUG_ON(!ops->remove_interface);
682	BUG_ON(!ops->configure_filter);
683	local->ops = ops;
684
685	/* set up some defaults */
686	local->hw.queues = 1;
687	local->hw.max_rates = 1;
688	local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
689	local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
690	local->hw.conf.radio_enabled = true;
691	local->user_power_level = -1;
692
693	INIT_LIST_HEAD(&local->interfaces);
694	mutex_init(&local->iflist_mtx);
695	mutex_init(&local->scan_mtx);
696
697	spin_lock_init(&local->key_lock);
698	spin_lock_init(&local->filter_lock);
699	spin_lock_init(&local->queue_stop_reason_lock);
700
701	INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
702
703	INIT_WORK(&local->restart_work, ieee80211_restart_work);
704
705	INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter);
706
707	INIT_WORK(&local->dynamic_ps_enable_work,
708		  ieee80211_dynamic_ps_enable_work);
709	INIT_WORK(&local->dynamic_ps_disable_work,
710		  ieee80211_dynamic_ps_disable_work);
711	setup_timer(&local->dynamic_ps_timer,
712		    ieee80211_dynamic_ps_timer, (unsigned long) local);
713
714	sta_info_init(local);
715
716	for (i = 0; i < IEEE80211_MAX_QUEUES; i++)
717		skb_queue_head_init(&local->pending[i]);
718	tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
719		     (unsigned long)local);
720	tasklet_disable(&local->tx_pending_tasklet);
721
722	tasklet_init(&local->tasklet,
723		     ieee80211_tasklet_handler,
724		     (unsigned long) local);
725	tasklet_disable(&local->tasklet);
726
727	skb_queue_head_init(&local->skb_queue);
728	skb_queue_head_init(&local->skb_queue_unreliable);
729
730	spin_lock_init(&local->ampdu_lock);
731
732	return local_to_hw(local);
733}
734EXPORT_SYMBOL(ieee80211_alloc_hw);
735
736int ieee80211_register_hw(struct ieee80211_hw *hw)
737{
738	struct ieee80211_local *local = hw_to_local(hw);
739	int result;
740	enum ieee80211_band band;
741	int channels, i, j, max_bitrates;
742	bool supp_ht;
743	static const u32 cipher_suites[] = {
744		WLAN_CIPHER_SUITE_WEP40,
745		WLAN_CIPHER_SUITE_WEP104,
746		WLAN_CIPHER_SUITE_TKIP,
747		WLAN_CIPHER_SUITE_CCMP,
748
749		/* keep last -- depends on hw flags! */
750		WLAN_CIPHER_SUITE_AES_CMAC
751	};
752
753	/*
754	 * generic code guarantees at least one band,
755	 * set this very early because much code assumes
756	 * that hw.conf.channel is assigned
757	 */
758	channels = 0;
759	max_bitrates = 0;
760	supp_ht = false;
761	for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
762		struct ieee80211_supported_band *sband;
763
764		sband = local->hw.wiphy->bands[band];
765		if (!sband)
766			continue;
767		if (!local->oper_channel) {
768			/* init channel we're on */
769			local->hw.conf.channel =
770			local->oper_channel = &sband->channels[0];
771			local->hw.conf.channel_type = NL80211_CHAN_NO_HT;
772		}
773		channels += sband->n_channels;
774
775		if (max_bitrates < sband->n_bitrates)
776			max_bitrates = sband->n_bitrates;
777		supp_ht = supp_ht || sband->ht_cap.ht_supported;
778	}
779
780	local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +
781				      sizeof(void *) * channels, GFP_KERNEL);
782	if (!local->int_scan_req)
783		return -ENOMEM;
784
785	/* if low-level driver supports AP, we also support VLAN */
786	if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP))
787		local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
788
789	/* mac80211 always supports monitor */
790	local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
791
792	if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
793		local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
794	else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
795		local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
796
797	/*
798	 * Calculate scan IE length -- we need this to alloc
799	 * memory and to subtract from the driver limit. It
800	 * includes the (extended) supported rates and HT
801	 * information -- SSID is the driver's responsibility.
802	 */
803	local->scan_ies_len = 4 + max_bitrates; /* (ext) supp rates */
804	if (supp_ht)
805		local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
806
807	if (!local->ops->hw_scan) {
808		/* For hw_scan, driver needs to set these up. */
809		local->hw.wiphy->max_scan_ssids = 4;
810		local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
811	}
812
813	/*
814	 * If the driver supports any scan IEs, then assume the
815	 * limit includes the IEs mac80211 will add, otherwise
816	 * leave it at zero and let the driver sort it out; we
817	 * still pass our IEs to the driver but userspace will
818	 * not be allowed to in that case.
819	 */
820	if (local->hw.wiphy->max_scan_ie_len)
821		local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
822
823	local->hw.wiphy->cipher_suites = cipher_suites;
824	local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
825	if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
826		local->hw.wiphy->n_cipher_suites--;
827
828	result = wiphy_register(local->hw.wiphy);
829	if (result < 0)
830		goto fail_wiphy_register;
831
832	/*
833	 * We use the number of queues for feature tests (QoS, HT) internally
834	 * so restrict them appropriately.
835	 */
836	if (hw->queues > IEEE80211_MAX_QUEUES)
837		hw->queues = IEEE80211_MAX_QUEUES;
838
839	local->workqueue =
840		create_singlethread_workqueue(wiphy_name(local->hw.wiphy));
841	if (!local->workqueue) {
842		result = -ENOMEM;
843		goto fail_workqueue;
844	}
845
846	/*
847	 * The hardware needs headroom for sending the frame,
848	 * and we need some headroom for passing the frame to monitor
849	 * interfaces, but never both at the same time.
850	 */
851	local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
852				   sizeof(struct ieee80211_tx_status_rtap_hdr));
853
854	debugfs_hw_add(local);
855
856	if (local->hw.max_listen_interval == 0)
857		local->hw.max_listen_interval = 1;
858
859	local->hw.conf.listen_interval = local->hw.max_listen_interval;
860
861	result = sta_info_start(local);
862	if (result < 0)
863		goto fail_sta_info;
864
865	result = ieee80211_wep_init(local);
866	if (result < 0) {
867		printk(KERN_DEBUG "%s: Failed to initialize wep: %d\n",
868		       wiphy_name(local->hw.wiphy), result);
869		goto fail_wep;
870	}
871
872	rtnl_lock();
873
874	result = ieee80211_init_rate_ctrl_alg(local,
875					      hw->rate_control_algorithm);
876	if (result < 0) {
877		printk(KERN_DEBUG "%s: Failed to initialize rate control "
878		       "algorithm\n", wiphy_name(local->hw.wiphy));
879		goto fail_rate;
880	}
881
882	/* add one default STA interface if supported */
883	if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
884		result = ieee80211_if_add(local, "wlan%d", NULL,
885					  NL80211_IFTYPE_STATION, NULL);
886		if (result)
887			printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
888			       wiphy_name(local->hw.wiphy));
889	}
890
891	rtnl_unlock();
892
893	ieee80211_led_init(local);
894
895	/* alloc internal scan request */
896	i = 0;
897	local->int_scan_req->ssids = &local->scan_ssid;
898	local->int_scan_req->n_ssids = 1;
899	for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
900		if (!hw->wiphy->bands[band])
901			continue;
902		for (j = 0; j < hw->wiphy->bands[band]->n_channels; j++) {
903			local->int_scan_req->channels[i] =
904				&hw->wiphy->bands[band]->channels[j];
905			i++;
906		}
907	}
908
909	local->network_latency_notifier.notifier_call =
910		ieee80211_max_network_latency;
911	result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
912				     &local->network_latency_notifier);
913
914	if (result) {
915		rtnl_lock();
916		goto fail_pm_qos;
917	}
918
919	return 0;
920
921 fail_pm_qos:
922	ieee80211_led_exit(local);
923	ieee80211_remove_interfaces(local);
924 fail_rate:
925	rtnl_unlock();
926	ieee80211_wep_free(local);
927 fail_wep:
928	sta_info_stop(local);
929 fail_sta_info:
930	debugfs_hw_del(local);
931	destroy_workqueue(local->workqueue);
932 fail_workqueue:
933	wiphy_unregister(local->hw.wiphy);
934 fail_wiphy_register:
935	kfree(local->int_scan_req->channels);
936	return result;
937}
938EXPORT_SYMBOL(ieee80211_register_hw);
939
940void ieee80211_unregister_hw(struct ieee80211_hw *hw)
941{
942	struct ieee80211_local *local = hw_to_local(hw);
943
944	tasklet_kill(&local->tx_pending_tasklet);
945	tasklet_kill(&local->tasklet);
946
947	pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
948			       &local->network_latency_notifier);
949
950	rtnl_lock();
951
952	/*
953	 * At this point, interface list manipulations are fine
954	 * because the driver cannot be handing us frames any
955	 * more and the tasklet is killed.
956	 */
957	ieee80211_remove_interfaces(local);
958
959	rtnl_unlock();
960
961	cancel_work_sync(&local->reconfig_filter);
962
963	ieee80211_clear_tx_pending(local);
964	sta_info_stop(local);
965	rate_control_deinitialize(local);
966	debugfs_hw_del(local);
967
968	if (skb_queue_len(&local->skb_queue)
969			|| skb_queue_len(&local->skb_queue_unreliable))
970		printk(KERN_WARNING "%s: skb_queue not empty\n",
971		       wiphy_name(local->hw.wiphy));
972	skb_queue_purge(&local->skb_queue);
973	skb_queue_purge(&local->skb_queue_unreliable);
974
975	destroy_workqueue(local->workqueue);
976	wiphy_unregister(local->hw.wiphy);
977	ieee80211_wep_free(local);
978	ieee80211_led_exit(local);
979	kfree(local->int_scan_req);
980}
981EXPORT_SYMBOL(ieee80211_unregister_hw);
982
983void ieee80211_free_hw(struct ieee80211_hw *hw)
984{
985	struct ieee80211_local *local = hw_to_local(hw);
986
987	mutex_destroy(&local->iflist_mtx);
988	mutex_destroy(&local->scan_mtx);
989
990	wiphy_free(local->hw.wiphy);
991}
992EXPORT_SYMBOL(ieee80211_free_hw);
993
994static int __init ieee80211_init(void)
995{
996	struct sk_buff *skb;
997	int ret;
998
999	BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1000	BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1001		     IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1002
1003	ret = rc80211_minstrel_init();
1004	if (ret)
1005		return ret;
1006
1007	ret = rc80211_pid_init();
1008	if (ret)
1009		return ret;
1010
1011	ieee80211_debugfs_netdev_init();
1012
1013	return 0;
1014}
1015
1016static void __exit ieee80211_exit(void)
1017{
1018	rc80211_pid_exit();
1019	rc80211_minstrel_exit();
1020
1021	/*
1022	 * For key todo, it'll be empty by now but the work
1023	 * might still be scheduled.
1024	 */
1025	flush_scheduled_work();
1026
1027	if (mesh_allocated)
1028		ieee80211s_stop();
1029
1030	ieee80211_debugfs_netdev_exit();
1031}
1032
1033
1034subsys_initcall(ieee80211_init);
1035module_exit(ieee80211_exit);
1036
1037MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1038MODULE_LICENSE("GPL");
1039