main.c revision 72bdcf34380917260da41e3c49e10edee04bc5cd 
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 <net/net_namespace.h>
25#include <net/cfg80211.h>
26
27#include "ieee80211_i.h"
28#include "rate.h"
29#include "mesh.h"
30#include "wep.h"
31#include "wme.h"
32#include "aes_ccm.h"
33#include "led.h"
34#include "cfg.h"
35#include "debugfs.h"
36#include "debugfs_netdev.h"
37
38/*
39 * For seeing transmitted packets on monitor interfaces
40 * we have a radiotap header too.
41 */
42struct ieee80211_tx_status_rtap_hdr {
43	struct ieee80211_radiotap_header hdr;
44	u8 rate;
45	u8 padding_for_rate;
46	__le16 tx_flags;
47	u8 data_retries;
48} __attribute__ ((packed));
49
50
51/* must be called under mdev tx lock */
52void ieee80211_configure_filter(struct ieee80211_local *local)
53{
54	unsigned int changed_flags;
55	unsigned int new_flags = 0;
56
57	if (atomic_read(&local->iff_promiscs))
58		new_flags |= FIF_PROMISC_IN_BSS;
59
60	if (atomic_read(&local->iff_allmultis))
61		new_flags |= FIF_ALLMULTI;
62
63	if (local->monitors)
64		new_flags |= FIF_BCN_PRBRESP_PROMISC;
65
66	if (local->fif_fcsfail)
67		new_flags |= FIF_FCSFAIL;
68
69	if (local->fif_plcpfail)
70		new_flags |= FIF_PLCPFAIL;
71
72	if (local->fif_control)
73		new_flags |= FIF_CONTROL;
74
75	if (local->fif_other_bss)
76		new_flags |= FIF_OTHER_BSS;
77
78	changed_flags = local->filter_flags ^ new_flags;
79
80	/* be a bit nasty */
81	new_flags |= (1<<31);
82
83	local->ops->configure_filter(local_to_hw(local),
84				     changed_flags, &new_flags,
85				     local->mdev->mc_count,
86				     local->mdev->mc_list);
87
88	WARN_ON(new_flags & (1<<31));
89
90	local->filter_flags = new_flags & ~(1<<31);
91}
92
93/* master interface */
94
95static int header_parse_80211(const struct sk_buff *skb, unsigned char *haddr)
96{
97	memcpy(haddr, skb_mac_header(skb) + 10, ETH_ALEN); /* addr2 */
98	return ETH_ALEN;
99}
100
101static const struct header_ops ieee80211_header_ops = {
102	.create		= eth_header,
103	.parse		= header_parse_80211,
104	.rebuild	= eth_rebuild_header,
105	.cache		= eth_header_cache,
106	.cache_update	= eth_header_cache_update,
107};
108
109static int ieee80211_master_open(struct net_device *dev)
110{
111	struct ieee80211_master_priv *mpriv = netdev_priv(dev);
112	struct ieee80211_local *local = mpriv->local;
113	struct ieee80211_sub_if_data *sdata;
114	int res = -EOPNOTSUPP;
115
116	/* we hold the RTNL here so can safely walk the list */
117	list_for_each_entry(sdata, &local->interfaces, list) {
118		if (netif_running(sdata->dev)) {
119			res = 0;
120			break;
121		}
122	}
123
124	if (res)
125		return res;
126
127	netif_tx_start_all_queues(local->mdev);
128
129	return 0;
130}
131
132static int ieee80211_master_stop(struct net_device *dev)
133{
134	struct ieee80211_master_priv *mpriv = netdev_priv(dev);
135	struct ieee80211_local *local = mpriv->local;
136	struct ieee80211_sub_if_data *sdata;
137
138	/* we hold the RTNL here so can safely walk the list */
139	list_for_each_entry(sdata, &local->interfaces, list)
140		if (netif_running(sdata->dev))
141			dev_close(sdata->dev);
142
143	return 0;
144}
145
146static void ieee80211_master_set_multicast_list(struct net_device *dev)
147{
148	struct ieee80211_master_priv *mpriv = netdev_priv(dev);
149	struct ieee80211_local *local = mpriv->local;
150
151	ieee80211_configure_filter(local);
152}
153
154/* everything else */
155
156int ieee80211_if_config(struct ieee80211_sub_if_data *sdata, u32 changed)
157{
158	struct ieee80211_local *local = sdata->local;
159	struct ieee80211_if_conf conf;
160
161	if (WARN_ON(!netif_running(sdata->dev)))
162		return 0;
163
164	if (WARN_ON(sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
165		return -EINVAL;
166
167	if (!local->ops->config_interface)
168		return 0;
169
170	memset(&conf, 0, sizeof(conf));
171	conf.changed = changed;
172
173	if (sdata->vif.type == NL80211_IFTYPE_STATION ||
174	    sdata->vif.type == NL80211_IFTYPE_ADHOC)
175		conf.bssid = sdata->u.sta.bssid;
176	else if (sdata->vif.type == NL80211_IFTYPE_AP)
177		conf.bssid = sdata->dev->dev_addr;
178	else if (ieee80211_vif_is_mesh(&sdata->vif)) {
179		u8 zero[ETH_ALEN] = { 0 };
180		conf.bssid = zero;
181	} else {
182		WARN_ON(1);
183		return -EINVAL;
184	}
185
186	if (WARN_ON(!conf.bssid && (changed & IEEE80211_IFCC_BSSID)))
187		return -EINVAL;
188
189	return local->ops->config_interface(local_to_hw(local),
190					    &sdata->vif, &conf);
191}
192
193int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
194{
195	struct ieee80211_channel *chan;
196	int ret = 0;
197	int power;
198	enum nl80211_sec_chan_offset sec_chan_offset;
199
200	might_sleep();
201
202	if (local->sw_scanning) {
203		chan = local->scan_channel;
204		sec_chan_offset = NL80211_SEC_CHAN_NO_HT;
205	} else {
206		chan = local->oper_channel;
207		sec_chan_offset = local->oper_sec_chan_offset;
208	}
209
210	if (chan != local->hw.conf.channel ||
211	    sec_chan_offset != local->hw.conf.ht.sec_chan_offset) {
212		local->hw.conf.channel = chan;
213		switch (sec_chan_offset) {
214		case NL80211_SEC_CHAN_NO_HT:
215			local->hw.conf.ht.enabled = false;
216			local->hw.conf.ht.sec_chan_offset = 0;
217			break;
218		case NL80211_SEC_CHAN_DISABLED:
219			local->hw.conf.ht.enabled = true;
220			local->hw.conf.ht.sec_chan_offset = 0;
221			break;
222		case NL80211_SEC_CHAN_BELOW:
223			local->hw.conf.ht.enabled = true;
224			local->hw.conf.ht.sec_chan_offset = -1;
225			break;
226		case NL80211_SEC_CHAN_ABOVE:
227			local->hw.conf.ht.enabled = true;
228			local->hw.conf.ht.sec_chan_offset = 1;
229			break;
230		}
231		changed |= IEEE80211_CONF_CHANGE_CHANNEL;
232	}
233
234	if (!local->hw.conf.power_level)
235		power = chan->max_power;
236	else
237		power = min(chan->max_power, local->hw.conf.power_level);
238	if (local->hw.conf.power_level != power) {
239		changed |= IEEE80211_CONF_CHANGE_POWER;
240		local->hw.conf.power_level = power;
241	}
242
243	if (changed && local->open_count) {
244		ret = local->ops->config(local_to_hw(local), changed);
245		/*
246		 * HW reconfiguration should never fail, the driver has told
247		 * us what it can support so it should live up to that promise.
248		 */
249		WARN_ON(ret);
250	}
251
252	return ret;
253}
254
255void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
256				      u32 changed)
257{
258	struct ieee80211_local *local = sdata->local;
259
260	if (WARN_ON(sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
261		return;
262
263	if (!changed)
264		return;
265
266	if (local->ops->bss_info_changed)
267		local->ops->bss_info_changed(local_to_hw(local),
268					     &sdata->vif,
269					     &sdata->vif.bss_conf,
270					     changed);
271}
272
273u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
274{
275	sdata->vif.bss_conf.use_cts_prot = false;
276	sdata->vif.bss_conf.use_short_preamble = false;
277	sdata->vif.bss_conf.use_short_slot = false;
278	return BSS_CHANGED_ERP_CTS_PROT |
279	       BSS_CHANGED_ERP_PREAMBLE |
280	       BSS_CHANGED_ERP_SLOT;
281}
282
283void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
284				 struct sk_buff *skb)
285{
286	struct ieee80211_local *local = hw_to_local(hw);
287	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
288	int tmp;
289
290	skb->dev = local->mdev;
291	skb->pkt_type = IEEE80211_TX_STATUS_MSG;
292	skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ?
293		       &local->skb_queue : &local->skb_queue_unreliable, skb);
294	tmp = skb_queue_len(&local->skb_queue) +
295		skb_queue_len(&local->skb_queue_unreliable);
296	while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
297	       (skb = skb_dequeue(&local->skb_queue_unreliable))) {
298		dev_kfree_skb_irq(skb);
299		tmp--;
300		I802_DEBUG_INC(local->tx_status_drop);
301	}
302	tasklet_schedule(&local->tasklet);
303}
304EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
305
306static void ieee80211_tasklet_handler(unsigned long data)
307{
308	struct ieee80211_local *local = (struct ieee80211_local *) data;
309	struct sk_buff *skb;
310	struct ieee80211_rx_status rx_status;
311	struct ieee80211_ra_tid *ra_tid;
312
313	while ((skb = skb_dequeue(&local->skb_queue)) ||
314	       (skb = skb_dequeue(&local->skb_queue_unreliable))) {
315		switch (skb->pkt_type) {
316		case IEEE80211_RX_MSG:
317			/* status is in skb->cb */
318			memcpy(&rx_status, skb->cb, sizeof(rx_status));
319			/* Clear skb->pkt_type in order to not confuse kernel
320			 * netstack. */
321			skb->pkt_type = 0;
322			__ieee80211_rx(local_to_hw(local), skb, &rx_status);
323			break;
324		case IEEE80211_TX_STATUS_MSG:
325			skb->pkt_type = 0;
326			ieee80211_tx_status(local_to_hw(local), skb);
327			break;
328		case IEEE80211_DELBA_MSG:
329			ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
330			ieee80211_stop_tx_ba_cb(local_to_hw(local),
331						ra_tid->ra, ra_tid->tid);
332			dev_kfree_skb(skb);
333			break;
334		case IEEE80211_ADDBA_MSG:
335			ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
336			ieee80211_start_tx_ba_cb(local_to_hw(local),
337						 ra_tid->ra, ra_tid->tid);
338			dev_kfree_skb(skb);
339			break ;
340		default:
341			WARN_ON(1);
342			dev_kfree_skb(skb);
343			break;
344		}
345	}
346}
347
348/* Remove added headers (e.g., QoS control), encryption header/MIC, etc. to
349 * make a prepared TX frame (one that has been given to hw) to look like brand
350 * new IEEE 802.11 frame that is ready to go through TX processing again.
351 */
352static void ieee80211_remove_tx_extra(struct ieee80211_local *local,
353				      struct ieee80211_key *key,
354				      struct sk_buff *skb)
355{
356	unsigned int hdrlen, iv_len, mic_len;
357	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
358
359	hdrlen = ieee80211_hdrlen(hdr->frame_control);
360
361	if (!key)
362		goto no_key;
363
364	switch (key->conf.alg) {
365	case ALG_WEP:
366		iv_len = WEP_IV_LEN;
367		mic_len = WEP_ICV_LEN;
368		break;
369	case ALG_TKIP:
370		iv_len = TKIP_IV_LEN;
371		mic_len = TKIP_ICV_LEN;
372		break;
373	case ALG_CCMP:
374		iv_len = CCMP_HDR_LEN;
375		mic_len = CCMP_MIC_LEN;
376		break;
377	default:
378		goto no_key;
379	}
380
381	if (skb->len >= hdrlen + mic_len &&
382	    !(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
383		skb_trim(skb, skb->len - mic_len);
384	if (skb->len >= hdrlen + iv_len) {
385		memmove(skb->data + iv_len, skb->data, hdrlen);
386		hdr = (struct ieee80211_hdr *)skb_pull(skb, iv_len);
387	}
388
389no_key:
390	if (ieee80211_is_data_qos(hdr->frame_control)) {
391		hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
392		memmove(skb->data + IEEE80211_QOS_CTL_LEN, skb->data,
393			hdrlen - IEEE80211_QOS_CTL_LEN);
394		skb_pull(skb, IEEE80211_QOS_CTL_LEN);
395	}
396}
397
398static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
399					    struct sta_info *sta,
400					    struct sk_buff *skb)
401{
402	sta->tx_filtered_count++;
403
404	/*
405	 * Clear the TX filter mask for this STA when sending the next
406	 * packet. If the STA went to power save mode, this will happen
407	 * when it wakes up for the next time.
408	 */
409	set_sta_flags(sta, WLAN_STA_CLEAR_PS_FILT);
410
411	/*
412	 * This code races in the following way:
413	 *
414	 *  (1) STA sends frame indicating it will go to sleep and does so
415	 *  (2) hardware/firmware adds STA to filter list, passes frame up
416	 *  (3) hardware/firmware processes TX fifo and suppresses a frame
417	 *  (4) we get TX status before having processed the frame and
418	 *	knowing that the STA has gone to sleep.
419	 *
420	 * This is actually quite unlikely even when both those events are
421	 * processed from interrupts coming in quickly after one another or
422	 * even at the same time because we queue both TX status events and
423	 * RX frames to be processed by a tasklet and process them in the
424	 * same order that they were received or TX status last. Hence, there
425	 * is no race as long as the frame RX is processed before the next TX
426	 * status, which drivers can ensure, see below.
427	 *
428	 * Note that this can only happen if the hardware or firmware can
429	 * actually add STAs to the filter list, if this is done by the
430	 * driver in response to set_tim() (which will only reduce the race
431	 * this whole filtering tries to solve, not completely solve it)
432	 * this situation cannot happen.
433	 *
434	 * To completely solve this race drivers need to make sure that they
435	 *  (a) don't mix the irq-safe/not irq-safe TX status/RX processing
436	 *	functions and
437	 *  (b) always process RX events before TX status events if ordering
438	 *      can be unknown, for example with different interrupt status
439	 *	bits.
440	 */
441	if (test_sta_flags(sta, WLAN_STA_PS) &&
442	    skb_queue_len(&sta->tx_filtered) < STA_MAX_TX_BUFFER) {
443		ieee80211_remove_tx_extra(local, sta->key, skb);
444		skb_queue_tail(&sta->tx_filtered, skb);
445		return;
446	}
447
448	if (!test_sta_flags(sta, WLAN_STA_PS) && !skb->requeue) {
449		/* Software retry the packet once */
450		skb->requeue = 1;
451		ieee80211_remove_tx_extra(local, sta->key, skb);
452		dev_queue_xmit(skb);
453		return;
454	}
455
456#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
457	if (net_ratelimit())
458		printk(KERN_DEBUG "%s: dropped TX filtered frame, "
459		       "queue_len=%d PS=%d @%lu\n",
460		       wiphy_name(local->hw.wiphy),
461		       skb_queue_len(&sta->tx_filtered),
462		       !!test_sta_flags(sta, WLAN_STA_PS), jiffies);
463#endif
464	dev_kfree_skb(skb);
465}
466
467void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
468{
469	struct sk_buff *skb2;
470	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
471	struct ieee80211_local *local = hw_to_local(hw);
472	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
473	u16 frag, type;
474	__le16 fc;
475	struct ieee80211_supported_band *sband;
476	struct ieee80211_tx_status_rtap_hdr *rthdr;
477	struct ieee80211_sub_if_data *sdata;
478	struct net_device *prev_dev = NULL;
479	struct sta_info *sta;
480	int retry_count = -1, i;
481
482	for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
483		/* the HW cannot have attempted that rate */
484		if (i >= hw->max_rates) {
485			info->status.rates[i].idx = -1;
486			info->status.rates[i].count = 0;
487		}
488
489		retry_count += info->status.rates[i].count;
490	}
491	if (retry_count < 0)
492		retry_count = 0;
493
494	rcu_read_lock();
495
496	sband = local->hw.wiphy->bands[info->band];
497
498	sta = sta_info_get(local, hdr->addr1);
499
500	if (sta) {
501		if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
502		    test_sta_flags(sta, WLAN_STA_PS)) {
503			/*
504			 * The STA is in power save mode, so assume
505			 * that this TX packet failed because of that.
506			 */
507			ieee80211_handle_filtered_frame(local, sta, skb);
508			rcu_read_unlock();
509			return;
510		}
511
512		fc = hdr->frame_control;
513
514		if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
515		    (ieee80211_is_data_qos(fc))) {
516			u16 tid, ssn;
517			u8 *qc;
518
519			qc = ieee80211_get_qos_ctl(hdr);
520			tid = qc[0] & 0xf;
521			ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
522						& IEEE80211_SCTL_SEQ);
523			ieee80211_send_bar(sta->sdata, hdr->addr1,
524					   tid, ssn);
525		}
526
527		if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
528			ieee80211_handle_filtered_frame(local, sta, skb);
529			rcu_read_unlock();
530			return;
531		} else {
532			if (!(info->flags & IEEE80211_TX_STAT_ACK))
533				sta->tx_retry_failed++;
534			sta->tx_retry_count += retry_count;
535		}
536
537		rate_control_tx_status(local, sband, sta, skb);
538	}
539
540	rcu_read_unlock();
541
542	ieee80211_led_tx(local, 0);
543
544	/* SNMP counters
545	 * Fragments are passed to low-level drivers as separate skbs, so these
546	 * are actually fragments, not frames. Update frame counters only for
547	 * the first fragment of the frame. */
548
549	frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG;
550	type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE;
551
552	if (info->flags & IEEE80211_TX_STAT_ACK) {
553		if (frag == 0) {
554			local->dot11TransmittedFrameCount++;
555			if (is_multicast_ether_addr(hdr->addr1))
556				local->dot11MulticastTransmittedFrameCount++;
557			if (retry_count > 0)
558				local->dot11RetryCount++;
559			if (retry_count > 1)
560				local->dot11MultipleRetryCount++;
561		}
562
563		/* This counter shall be incremented for an acknowledged MPDU
564		 * with an individual address in the address 1 field or an MPDU
565		 * with a multicast address in the address 1 field of type Data
566		 * or Management. */
567		if (!is_multicast_ether_addr(hdr->addr1) ||
568		    type == IEEE80211_FTYPE_DATA ||
569		    type == IEEE80211_FTYPE_MGMT)
570			local->dot11TransmittedFragmentCount++;
571	} else {
572		if (frag == 0)
573			local->dot11FailedCount++;
574	}
575
576	/* this was a transmitted frame, but now we want to reuse it */
577	skb_orphan(skb);
578
579	/*
580	 * This is a bit racy but we can avoid a lot of work
581	 * with this test...
582	 */
583	if (!local->monitors && !local->cooked_mntrs) {
584		dev_kfree_skb(skb);
585		return;
586	}
587
588	/* send frame to monitor interfaces now */
589
590	if (skb_headroom(skb) < sizeof(*rthdr)) {
591		printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
592		dev_kfree_skb(skb);
593		return;
594	}
595
596	rthdr = (struct ieee80211_tx_status_rtap_hdr *)
597				skb_push(skb, sizeof(*rthdr));
598
599	memset(rthdr, 0, sizeof(*rthdr));
600	rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
601	rthdr->hdr.it_present =
602		cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
603			    (1 << IEEE80211_RADIOTAP_DATA_RETRIES) |
604			    (1 << IEEE80211_RADIOTAP_RATE));
605
606	if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
607	    !is_multicast_ether_addr(hdr->addr1))
608		rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL);
609
610	/*
611	 * XXX: Once radiotap gets the bitmap reset thing the vendor
612	 *	extensions proposal contains, we can actually report
613	 *	the whole set of tries we did.
614	 */
615	if ((info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) ||
616	    (info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT))
617		rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS);
618	else if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS)
619		rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS);
620	if (info->status.rates[0].idx >= 0 &&
621	    !(info->status.rates[0].flags & IEEE80211_TX_RC_MCS))
622		rthdr->rate = sband->bitrates[
623				info->status.rates[0].idx].bitrate / 5;
624
625	/* for now report the total retry_count */
626	rthdr->data_retries = retry_count;
627
628	/* XXX: is this sufficient for BPF? */
629	skb_set_mac_header(skb, 0);
630	skb->ip_summed = CHECKSUM_UNNECESSARY;
631	skb->pkt_type = PACKET_OTHERHOST;
632	skb->protocol = htons(ETH_P_802_2);
633	memset(skb->cb, 0, sizeof(skb->cb));
634
635	rcu_read_lock();
636	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
637		if (sdata->vif.type == NL80211_IFTYPE_MONITOR) {
638			if (!netif_running(sdata->dev))
639				continue;
640
641			if (prev_dev) {
642				skb2 = skb_clone(skb, GFP_ATOMIC);
643				if (skb2) {
644					skb2->dev = prev_dev;
645					netif_rx(skb2);
646				}
647			}
648
649			prev_dev = sdata->dev;
650		}
651	}
652	if (prev_dev) {
653		skb->dev = prev_dev;
654		netif_rx(skb);
655		skb = NULL;
656	}
657	rcu_read_unlock();
658	dev_kfree_skb(skb);
659}
660EXPORT_SYMBOL(ieee80211_tx_status);
661
662struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
663					const struct ieee80211_ops *ops)
664{
665	struct ieee80211_local *local;
666	int priv_size;
667	struct wiphy *wiphy;
668
669	/* Ensure 32-byte alignment of our private data and hw private data.
670	 * We use the wiphy priv data for both our ieee80211_local and for
671	 * the driver's private data
672	 *
673	 * In memory it'll be like this:
674	 *
675	 * +-------------------------+
676	 * | struct wiphy	    |
677	 * +-------------------------+
678	 * | struct ieee80211_local  |
679	 * +-------------------------+
680	 * | driver's private data   |
681	 * +-------------------------+
682	 *
683	 */
684	priv_size = ((sizeof(struct ieee80211_local) +
685		      NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST) +
686		    priv_data_len;
687
688	wiphy = wiphy_new(&mac80211_config_ops, priv_size);
689
690	if (!wiphy)
691		return NULL;
692
693	wiphy->privid = mac80211_wiphy_privid;
694
695	local = wiphy_priv(wiphy);
696	local->hw.wiphy = wiphy;
697
698	local->hw.priv = (char *)local +
699			 ((sizeof(struct ieee80211_local) +
700			   NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);
701
702	BUG_ON(!ops->tx);
703	BUG_ON(!ops->start);
704	BUG_ON(!ops->stop);
705	BUG_ON(!ops->config);
706	BUG_ON(!ops->add_interface);
707	BUG_ON(!ops->remove_interface);
708	BUG_ON(!ops->configure_filter);
709	local->ops = ops;
710
711	/* set up some defaults */
712	local->hw.queues = 1;
713	local->hw.max_rates = 1;
714	local->rts_threshold = IEEE80211_MAX_RTS_THRESHOLD;
715	local->fragmentation_threshold = IEEE80211_MAX_FRAG_THRESHOLD;
716	local->hw.conf.long_frame_max_tx_count = 4;
717	local->hw.conf.short_frame_max_tx_count = 7;
718	local->hw.conf.radio_enabled = true;
719
720	INIT_LIST_HEAD(&local->interfaces);
721
722	spin_lock_init(&local->key_lock);
723
724	INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
725
726	sta_info_init(local);
727
728	tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
729		     (unsigned long)local);
730	tasklet_disable(&local->tx_pending_tasklet);
731
732	tasklet_init(&local->tasklet,
733		     ieee80211_tasklet_handler,
734		     (unsigned long) local);
735	tasklet_disable(&local->tasklet);
736
737	skb_queue_head_init(&local->skb_queue);
738	skb_queue_head_init(&local->skb_queue_unreliable);
739
740	return local_to_hw(local);
741}
742EXPORT_SYMBOL(ieee80211_alloc_hw);
743
744int ieee80211_register_hw(struct ieee80211_hw *hw)
745{
746	struct ieee80211_local *local = hw_to_local(hw);
747	int result;
748	enum ieee80211_band band;
749	struct net_device *mdev;
750	struct ieee80211_master_priv *mpriv;
751
752	/*
753	 * generic code guarantees at least one band,
754	 * set this very early because much code assumes
755	 * that hw.conf.channel is assigned
756	 */
757	for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
758		struct ieee80211_supported_band *sband;
759
760		sband = local->hw.wiphy->bands[band];
761		if (sband) {
762			/* init channel we're on */
763			local->hw.conf.channel =
764			local->oper_channel =
765			local->scan_channel = &sband->channels[0];
766			break;
767		}
768	}
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	result = wiphy_register(local->hw.wiphy);
778	if (result < 0)
779		return result;
780
781	/*
782	 * We use the number of queues for feature tests (QoS, HT) internally
783	 * so restrict them appropriately.
784	 */
785	if (hw->queues > IEEE80211_MAX_QUEUES)
786		hw->queues = IEEE80211_MAX_QUEUES;
787	if (hw->ampdu_queues > IEEE80211_MAX_AMPDU_QUEUES)
788		hw->ampdu_queues = IEEE80211_MAX_AMPDU_QUEUES;
789	if (hw->queues < 4)
790		hw->ampdu_queues = 0;
791
792	mdev = alloc_netdev_mq(sizeof(struct ieee80211_master_priv),
793			       "wmaster%d", ether_setup,
794			       ieee80211_num_queues(hw));
795	if (!mdev)
796		goto fail_mdev_alloc;
797
798	mpriv = netdev_priv(mdev);
799	mpriv->local = local;
800	local->mdev = mdev;
801
802	ieee80211_rx_bss_list_init(local);
803
804	mdev->hard_start_xmit = ieee80211_master_start_xmit;
805	mdev->open = ieee80211_master_open;
806	mdev->stop = ieee80211_master_stop;
807	mdev->type = ARPHRD_IEEE80211;
808	mdev->header_ops = &ieee80211_header_ops;
809	mdev->set_multicast_list = ieee80211_master_set_multicast_list;
810
811	local->hw.workqueue =
812		create_freezeable_workqueue(wiphy_name(local->hw.wiphy));
813	if (!local->hw.workqueue) {
814		result = -ENOMEM;
815		goto fail_workqueue;
816	}
817
818	/*
819	 * The hardware needs headroom for sending the frame,
820	 * and we need some headroom for passing the frame to monitor
821	 * interfaces, but never both at the same time.
822	 */
823	local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
824				   sizeof(struct ieee80211_tx_status_rtap_hdr));
825
826	debugfs_hw_add(local);
827
828	if (local->hw.conf.beacon_int < 10)
829		local->hw.conf.beacon_int = 100;
830
831	if (local->hw.max_listen_interval == 0)
832		local->hw.max_listen_interval = 1;
833
834	local->hw.conf.listen_interval = local->hw.max_listen_interval;
835
836	local->wstats_flags |= local->hw.flags & (IEEE80211_HW_SIGNAL_UNSPEC |
837						  IEEE80211_HW_SIGNAL_DB |
838						  IEEE80211_HW_SIGNAL_DBM) ?
839			       IW_QUAL_QUAL_UPDATED : IW_QUAL_QUAL_INVALID;
840	local->wstats_flags |= local->hw.flags & IEEE80211_HW_NOISE_DBM ?
841			       IW_QUAL_NOISE_UPDATED : IW_QUAL_NOISE_INVALID;
842	if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
843		local->wstats_flags |= IW_QUAL_DBM;
844
845	result = sta_info_start(local);
846	if (result < 0)
847		goto fail_sta_info;
848
849	rtnl_lock();
850	result = dev_alloc_name(local->mdev, local->mdev->name);
851	if (result < 0)
852		goto fail_dev;
853
854	memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
855	SET_NETDEV_DEV(local->mdev, wiphy_dev(local->hw.wiphy));
856
857	result = register_netdevice(local->mdev);
858	if (result < 0)
859		goto fail_dev;
860
861	result = ieee80211_init_rate_ctrl_alg(local,
862					      hw->rate_control_algorithm);
863	if (result < 0) {
864		printk(KERN_DEBUG "%s: Failed to initialize rate control "
865		       "algorithm\n", wiphy_name(local->hw.wiphy));
866		goto fail_rate;
867	}
868
869	result = ieee80211_wep_init(local);
870
871	if (result < 0) {
872		printk(KERN_DEBUG "%s: Failed to initialize wep: %d\n",
873		       wiphy_name(local->hw.wiphy), result);
874		goto fail_wep;
875	}
876
877	local->mdev->select_queue = ieee80211_select_queue;
878
879	/* add one default STA interface */
880	result = ieee80211_if_add(local, "wlan%d", NULL,
881				  NL80211_IFTYPE_STATION, NULL);
882	if (result)
883		printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
884		       wiphy_name(local->hw.wiphy));
885
886	rtnl_unlock();
887
888	ieee80211_led_init(local);
889
890	return 0;
891
892fail_wep:
893	rate_control_deinitialize(local);
894fail_rate:
895	unregister_netdevice(local->mdev);
896	local->mdev = NULL;
897fail_dev:
898	rtnl_unlock();
899	sta_info_stop(local);
900fail_sta_info:
901	debugfs_hw_del(local);
902	destroy_workqueue(local->hw.workqueue);
903fail_workqueue:
904	if (local->mdev)
905		free_netdev(local->mdev);
906fail_mdev_alloc:
907	wiphy_unregister(local->hw.wiphy);
908	return result;
909}
910EXPORT_SYMBOL(ieee80211_register_hw);
911
912void ieee80211_unregister_hw(struct ieee80211_hw *hw)
913{
914	struct ieee80211_local *local = hw_to_local(hw);
915
916	tasklet_kill(&local->tx_pending_tasklet);
917	tasklet_kill(&local->tasklet);
918
919	rtnl_lock();
920
921	/*
922	 * At this point, interface list manipulations are fine
923	 * because the driver cannot be handing us frames any
924	 * more and the tasklet is killed.
925	 */
926
927	/* First, we remove all virtual interfaces. */
928	ieee80211_remove_interfaces(local);
929
930	/* then, finally, remove the master interface */
931	unregister_netdevice(local->mdev);
932
933	rtnl_unlock();
934
935	ieee80211_rx_bss_list_deinit(local);
936	ieee80211_clear_tx_pending(local);
937	sta_info_stop(local);
938	rate_control_deinitialize(local);
939	debugfs_hw_del(local);
940
941	if (skb_queue_len(&local->skb_queue)
942			|| skb_queue_len(&local->skb_queue_unreliable))
943		printk(KERN_WARNING "%s: skb_queue not empty\n",
944		       wiphy_name(local->hw.wiphy));
945	skb_queue_purge(&local->skb_queue);
946	skb_queue_purge(&local->skb_queue_unreliable);
947
948	destroy_workqueue(local->hw.workqueue);
949	wiphy_unregister(local->hw.wiphy);
950	ieee80211_wep_free(local);
951	ieee80211_led_exit(local);
952	free_netdev(local->mdev);
953}
954EXPORT_SYMBOL(ieee80211_unregister_hw);
955
956void ieee80211_free_hw(struct ieee80211_hw *hw)
957{
958	struct ieee80211_local *local = hw_to_local(hw);
959
960	wiphy_free(local->hw.wiphy);
961}
962EXPORT_SYMBOL(ieee80211_free_hw);
963
964static int __init ieee80211_init(void)
965{
966	struct sk_buff *skb;
967	int ret;
968
969	BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
970	BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
971		     IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
972
973	ret = rc80211_minstrel_init();
974	if (ret)
975		return ret;
976
977	ret = rc80211_pid_init();
978	if (ret)
979		return ret;
980
981	ieee80211_debugfs_netdev_init();
982
983	return 0;
984}
985
986static void __exit ieee80211_exit(void)
987{
988	rc80211_pid_exit();
989	rc80211_minstrel_exit();
990
991	/*
992	 * For key todo, it'll be empty by now but the work
993	 * might still be scheduled.
994	 */
995	flush_scheduled_work();
996
997	if (mesh_allocated)
998		ieee80211s_stop();
999
1000	ieee80211_debugfs_netdev_exit();
1001}
1002
1003
1004subsys_initcall(ieee80211_init);
1005module_exit(ieee80211_exit);
1006
1007MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1008MODULE_LICENSE("GPL");
1009