main.c revision 094d05dc32fc2930e381189a942016e5561775d9 
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_channel_type channel_type;
199
200	might_sleep();
201
202	if (local->sw_scanning) {
203		chan = local->scan_channel;
204		channel_type = NL80211_CHAN_NO_HT;
205	} else {
206		chan = local->oper_channel;
207		channel_type = local->oper_channel_type;
208	}
209
210	if (chan != local->hw.conf.channel ||
211	    channel_type != local->hw.conf.ht.channel_type) {
212		local->hw.conf.channel = chan;
213		local->hw.conf.ht.channel_type = channel_type;
214		switch (channel_type) {
215		case NL80211_CHAN_NO_HT:
216			local->hw.conf.ht.enabled = false;
217			break;
218		case NL80211_CHAN_HT20:
219		case NL80211_CHAN_HT40MINUS:
220		case NL80211_CHAN_HT40PLUS:
221			local->hw.conf.ht.enabled = true;
222			break;
223		}
224		changed |= IEEE80211_CONF_CHANGE_CHANNEL;
225	}
226
227	if (!local->hw.conf.power_level)
228		power = chan->max_power;
229	else
230		power = min(chan->max_power, local->hw.conf.power_level);
231	if (local->hw.conf.power_level != power) {
232		changed |= IEEE80211_CONF_CHANGE_POWER;
233		local->hw.conf.power_level = power;
234	}
235
236	if (changed && local->open_count) {
237		ret = local->ops->config(local_to_hw(local), changed);
238		/*
239		 * Goal:
240		 * HW reconfiguration should never fail, the driver has told
241		 * us what it can support so it should live up to that promise.
242		 *
243		 * Current status:
244		 * rfkill is not integrated with mac80211 and a
245		 * configuration command can thus fail if hardware rfkill
246		 * is enabled
247		 *
248		 * FIXME: integrate rfkill with mac80211 and then add this
249		 * WARN_ON() back
250		 *
251		 */
252		/* WARN_ON(ret); */
253	}
254
255	return ret;
256}
257
258void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
259				      u32 changed)
260{
261	struct ieee80211_local *local = sdata->local;
262
263	if (WARN_ON(sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
264		return;
265
266	if (!changed)
267		return;
268
269	if (local->ops->bss_info_changed)
270		local->ops->bss_info_changed(local_to_hw(local),
271					     &sdata->vif,
272					     &sdata->vif.bss_conf,
273					     changed);
274}
275
276u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
277{
278	sdata->vif.bss_conf.use_cts_prot = false;
279	sdata->vif.bss_conf.use_short_preamble = false;
280	sdata->vif.bss_conf.use_short_slot = false;
281	return BSS_CHANGED_ERP_CTS_PROT |
282	       BSS_CHANGED_ERP_PREAMBLE |
283	       BSS_CHANGED_ERP_SLOT;
284}
285
286void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
287				 struct sk_buff *skb)
288{
289	struct ieee80211_local *local = hw_to_local(hw);
290	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
291	int tmp;
292
293	skb->dev = local->mdev;
294	skb->pkt_type = IEEE80211_TX_STATUS_MSG;
295	skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ?
296		       &local->skb_queue : &local->skb_queue_unreliable, skb);
297	tmp = skb_queue_len(&local->skb_queue) +
298		skb_queue_len(&local->skb_queue_unreliable);
299	while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
300	       (skb = skb_dequeue(&local->skb_queue_unreliable))) {
301		dev_kfree_skb_irq(skb);
302		tmp--;
303		I802_DEBUG_INC(local->tx_status_drop);
304	}
305	tasklet_schedule(&local->tasklet);
306}
307EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
308
309static void ieee80211_tasklet_handler(unsigned long data)
310{
311	struct ieee80211_local *local = (struct ieee80211_local *) data;
312	struct sk_buff *skb;
313	struct ieee80211_rx_status rx_status;
314	struct ieee80211_ra_tid *ra_tid;
315
316	while ((skb = skb_dequeue(&local->skb_queue)) ||
317	       (skb = skb_dequeue(&local->skb_queue_unreliable))) {
318		switch (skb->pkt_type) {
319		case IEEE80211_RX_MSG:
320			/* status is in skb->cb */
321			memcpy(&rx_status, skb->cb, sizeof(rx_status));
322			/* Clear skb->pkt_type in order to not confuse kernel
323			 * netstack. */
324			skb->pkt_type = 0;
325			__ieee80211_rx(local_to_hw(local), skb, &rx_status);
326			break;
327		case IEEE80211_TX_STATUS_MSG:
328			skb->pkt_type = 0;
329			ieee80211_tx_status(local_to_hw(local), skb);
330			break;
331		case IEEE80211_DELBA_MSG:
332			ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
333			ieee80211_stop_tx_ba_cb(local_to_hw(local),
334						ra_tid->ra, ra_tid->tid);
335			dev_kfree_skb(skb);
336			break;
337		case IEEE80211_ADDBA_MSG:
338			ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
339			ieee80211_start_tx_ba_cb(local_to_hw(local),
340						 ra_tid->ra, ra_tid->tid);
341			dev_kfree_skb(skb);
342			break ;
343		default:
344			WARN_ON(1);
345			dev_kfree_skb(skb);
346			break;
347		}
348	}
349}
350
351/* Remove added headers (e.g., QoS control), encryption header/MIC, etc. to
352 * make a prepared TX frame (one that has been given to hw) to look like brand
353 * new IEEE 802.11 frame that is ready to go through TX processing again.
354 */
355static void ieee80211_remove_tx_extra(struct ieee80211_local *local,
356				      struct ieee80211_key *key,
357				      struct sk_buff *skb)
358{
359	unsigned int hdrlen, iv_len, mic_len;
360	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
361
362	hdrlen = ieee80211_hdrlen(hdr->frame_control);
363
364	if (!key)
365		goto no_key;
366
367	switch (key->conf.alg) {
368	case ALG_WEP:
369		iv_len = WEP_IV_LEN;
370		mic_len = WEP_ICV_LEN;
371		break;
372	case ALG_TKIP:
373		iv_len = TKIP_IV_LEN;
374		mic_len = TKIP_ICV_LEN;
375		break;
376	case ALG_CCMP:
377		iv_len = CCMP_HDR_LEN;
378		mic_len = CCMP_MIC_LEN;
379		break;
380	default:
381		goto no_key;
382	}
383
384	if (skb->len >= hdrlen + mic_len &&
385	    !(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
386		skb_trim(skb, skb->len - mic_len);
387	if (skb->len >= hdrlen + iv_len) {
388		memmove(skb->data + iv_len, skb->data, hdrlen);
389		hdr = (struct ieee80211_hdr *)skb_pull(skb, iv_len);
390	}
391
392no_key:
393	if (ieee80211_is_data_qos(hdr->frame_control)) {
394		hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
395		memmove(skb->data + IEEE80211_QOS_CTL_LEN, skb->data,
396			hdrlen - IEEE80211_QOS_CTL_LEN);
397		skb_pull(skb, IEEE80211_QOS_CTL_LEN);
398	}
399}
400
401static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
402					    struct sta_info *sta,
403					    struct sk_buff *skb)
404{
405	sta->tx_filtered_count++;
406
407	/*
408	 * Clear the TX filter mask for this STA when sending the next
409	 * packet. If the STA went to power save mode, this will happen
410	 * when it wakes up for the next time.
411	 */
412	set_sta_flags(sta, WLAN_STA_CLEAR_PS_FILT);
413
414	/*
415	 * This code races in the following way:
416	 *
417	 *  (1) STA sends frame indicating it will go to sleep and does so
418	 *  (2) hardware/firmware adds STA to filter list, passes frame up
419	 *  (3) hardware/firmware processes TX fifo and suppresses a frame
420	 *  (4) we get TX status before having processed the frame and
421	 *	knowing that the STA has gone to sleep.
422	 *
423	 * This is actually quite unlikely even when both those events are
424	 * processed from interrupts coming in quickly after one another or
425	 * even at the same time because we queue both TX status events and
426	 * RX frames to be processed by a tasklet and process them in the
427	 * same order that they were received or TX status last. Hence, there
428	 * is no race as long as the frame RX is processed before the next TX
429	 * status, which drivers can ensure, see below.
430	 *
431	 * Note that this can only happen if the hardware or firmware can
432	 * actually add STAs to the filter list, if this is done by the
433	 * driver in response to set_tim() (which will only reduce the race
434	 * this whole filtering tries to solve, not completely solve it)
435	 * this situation cannot happen.
436	 *
437	 * To completely solve this race drivers need to make sure that they
438	 *  (a) don't mix the irq-safe/not irq-safe TX status/RX processing
439	 *	functions and
440	 *  (b) always process RX events before TX status events if ordering
441	 *      can be unknown, for example with different interrupt status
442	 *	bits.
443	 */
444	if (test_sta_flags(sta, WLAN_STA_PS) &&
445	    skb_queue_len(&sta->tx_filtered) < STA_MAX_TX_BUFFER) {
446		ieee80211_remove_tx_extra(local, sta->key, skb);
447		skb_queue_tail(&sta->tx_filtered, skb);
448		return;
449	}
450
451	if (!test_sta_flags(sta, WLAN_STA_PS) && !skb->requeue) {
452		/* Software retry the packet once */
453		skb->requeue = 1;
454		ieee80211_remove_tx_extra(local, sta->key, skb);
455		dev_queue_xmit(skb);
456		return;
457	}
458
459#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
460	if (net_ratelimit())
461		printk(KERN_DEBUG "%s: dropped TX filtered frame, "
462		       "queue_len=%d PS=%d @%lu\n",
463		       wiphy_name(local->hw.wiphy),
464		       skb_queue_len(&sta->tx_filtered),
465		       !!test_sta_flags(sta, WLAN_STA_PS), jiffies);
466#endif
467	dev_kfree_skb(skb);
468}
469
470void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
471{
472	struct sk_buff *skb2;
473	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
474	struct ieee80211_local *local = hw_to_local(hw);
475	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
476	u16 frag, type;
477	__le16 fc;
478	struct ieee80211_supported_band *sband;
479	struct ieee80211_tx_status_rtap_hdr *rthdr;
480	struct ieee80211_sub_if_data *sdata;
481	struct net_device *prev_dev = NULL;
482	struct sta_info *sta;
483	int retry_count = -1, i;
484
485	for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
486		/* the HW cannot have attempted that rate */
487		if (i >= hw->max_rates) {
488			info->status.rates[i].idx = -1;
489			info->status.rates[i].count = 0;
490		}
491
492		retry_count += info->status.rates[i].count;
493	}
494	if (retry_count < 0)
495		retry_count = 0;
496
497	rcu_read_lock();
498
499	sband = local->hw.wiphy->bands[info->band];
500
501	sta = sta_info_get(local, hdr->addr1);
502
503	if (sta) {
504		if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
505		    test_sta_flags(sta, WLAN_STA_PS)) {
506			/*
507			 * The STA is in power save mode, so assume
508			 * that this TX packet failed because of that.
509			 */
510			ieee80211_handle_filtered_frame(local, sta, skb);
511			rcu_read_unlock();
512			return;
513		}
514
515		fc = hdr->frame_control;
516
517		if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
518		    (ieee80211_is_data_qos(fc))) {
519			u16 tid, ssn;
520			u8 *qc;
521
522			qc = ieee80211_get_qos_ctl(hdr);
523			tid = qc[0] & 0xf;
524			ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
525						& IEEE80211_SCTL_SEQ);
526			ieee80211_send_bar(sta->sdata, hdr->addr1,
527					   tid, ssn);
528		}
529
530		if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
531			ieee80211_handle_filtered_frame(local, sta, skb);
532			rcu_read_unlock();
533			return;
534		} else {
535			if (!(info->flags & IEEE80211_TX_STAT_ACK))
536				sta->tx_retry_failed++;
537			sta->tx_retry_count += retry_count;
538		}
539
540		rate_control_tx_status(local, sband, sta, skb);
541	}
542
543	rcu_read_unlock();
544
545	ieee80211_led_tx(local, 0);
546
547	/* SNMP counters
548	 * Fragments are passed to low-level drivers as separate skbs, so these
549	 * are actually fragments, not frames. Update frame counters only for
550	 * the first fragment of the frame. */
551
552	frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG;
553	type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE;
554
555	if (info->flags & IEEE80211_TX_STAT_ACK) {
556		if (frag == 0) {
557			local->dot11TransmittedFrameCount++;
558			if (is_multicast_ether_addr(hdr->addr1))
559				local->dot11MulticastTransmittedFrameCount++;
560			if (retry_count > 0)
561				local->dot11RetryCount++;
562			if (retry_count > 1)
563				local->dot11MultipleRetryCount++;
564		}
565
566		/* This counter shall be incremented for an acknowledged MPDU
567		 * with an individual address in the address 1 field or an MPDU
568		 * with a multicast address in the address 1 field of type Data
569		 * or Management. */
570		if (!is_multicast_ether_addr(hdr->addr1) ||
571		    type == IEEE80211_FTYPE_DATA ||
572		    type == IEEE80211_FTYPE_MGMT)
573			local->dot11TransmittedFragmentCount++;
574	} else {
575		if (frag == 0)
576			local->dot11FailedCount++;
577	}
578
579	/* this was a transmitted frame, but now we want to reuse it */
580	skb_orphan(skb);
581
582	/*
583	 * This is a bit racy but we can avoid a lot of work
584	 * with this test...
585	 */
586	if (!local->monitors && !local->cooked_mntrs) {
587		dev_kfree_skb(skb);
588		return;
589	}
590
591	/* send frame to monitor interfaces now */
592
593	if (skb_headroom(skb) < sizeof(*rthdr)) {
594		printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
595		dev_kfree_skb(skb);
596		return;
597	}
598
599	rthdr = (struct ieee80211_tx_status_rtap_hdr *)
600				skb_push(skb, sizeof(*rthdr));
601
602	memset(rthdr, 0, sizeof(*rthdr));
603	rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
604	rthdr->hdr.it_present =
605		cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
606			    (1 << IEEE80211_RADIOTAP_DATA_RETRIES) |
607			    (1 << IEEE80211_RADIOTAP_RATE));
608
609	if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
610	    !is_multicast_ether_addr(hdr->addr1))
611		rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL);
612
613	/*
614	 * XXX: Once radiotap gets the bitmap reset thing the vendor
615	 *	extensions proposal contains, we can actually report
616	 *	the whole set of tries we did.
617	 */
618	if ((info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) ||
619	    (info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT))
620		rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS);
621	else if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS)
622		rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS);
623	if (info->status.rates[0].idx >= 0 &&
624	    !(info->status.rates[0].flags & IEEE80211_TX_RC_MCS))
625		rthdr->rate = sband->bitrates[
626				info->status.rates[0].idx].bitrate / 5;
627
628	/* for now report the total retry_count */
629	rthdr->data_retries = retry_count;
630
631	/* XXX: is this sufficient for BPF? */
632	skb_set_mac_header(skb, 0);
633	skb->ip_summed = CHECKSUM_UNNECESSARY;
634	skb->pkt_type = PACKET_OTHERHOST;
635	skb->protocol = htons(ETH_P_802_2);
636	memset(skb->cb, 0, sizeof(skb->cb));
637
638	rcu_read_lock();
639	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
640		if (sdata->vif.type == NL80211_IFTYPE_MONITOR) {
641			if (!netif_running(sdata->dev))
642				continue;
643
644			if (prev_dev) {
645				skb2 = skb_clone(skb, GFP_ATOMIC);
646				if (skb2) {
647					skb2->dev = prev_dev;
648					netif_rx(skb2);
649				}
650			}
651
652			prev_dev = sdata->dev;
653		}
654	}
655	if (prev_dev) {
656		skb->dev = prev_dev;
657		netif_rx(skb);
658		skb = NULL;
659	}
660	rcu_read_unlock();
661	dev_kfree_skb(skb);
662}
663EXPORT_SYMBOL(ieee80211_tx_status);
664
665struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
666					const struct ieee80211_ops *ops)
667{
668	struct ieee80211_local *local;
669	int priv_size;
670	struct wiphy *wiphy;
671
672	/* Ensure 32-byte alignment of our private data and hw private data.
673	 * We use the wiphy priv data for both our ieee80211_local and for
674	 * the driver's private data
675	 *
676	 * In memory it'll be like this:
677	 *
678	 * +-------------------------+
679	 * | struct wiphy	    |
680	 * +-------------------------+
681	 * | struct ieee80211_local  |
682	 * +-------------------------+
683	 * | driver's private data   |
684	 * +-------------------------+
685	 *
686	 */
687	priv_size = ((sizeof(struct ieee80211_local) +
688		      NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST) +
689		    priv_data_len;
690
691	wiphy = wiphy_new(&mac80211_config_ops, priv_size);
692
693	if (!wiphy)
694		return NULL;
695
696	wiphy->privid = mac80211_wiphy_privid;
697
698	local = wiphy_priv(wiphy);
699	local->hw.wiphy = wiphy;
700
701	local->hw.priv = (char *)local +
702			 ((sizeof(struct ieee80211_local) +
703			   NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);
704
705	BUG_ON(!ops->tx);
706	BUG_ON(!ops->start);
707	BUG_ON(!ops->stop);
708	BUG_ON(!ops->config);
709	BUG_ON(!ops->add_interface);
710	BUG_ON(!ops->remove_interface);
711	BUG_ON(!ops->configure_filter);
712	local->ops = ops;
713
714	/* set up some defaults */
715	local->hw.queues = 1;
716	local->hw.max_rates = 1;
717	local->rts_threshold = IEEE80211_MAX_RTS_THRESHOLD;
718	local->fragmentation_threshold = IEEE80211_MAX_FRAG_THRESHOLD;
719	local->hw.conf.long_frame_max_tx_count = 4;
720	local->hw.conf.short_frame_max_tx_count = 7;
721	local->hw.conf.radio_enabled = true;
722
723	INIT_LIST_HEAD(&local->interfaces);
724
725	spin_lock_init(&local->key_lock);
726
727	INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
728
729	sta_info_init(local);
730
731	tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
732		     (unsigned long)local);
733	tasklet_disable(&local->tx_pending_tasklet);
734
735	tasklet_init(&local->tasklet,
736		     ieee80211_tasklet_handler,
737		     (unsigned long) local);
738	tasklet_disable(&local->tasklet);
739
740	skb_queue_head_init(&local->skb_queue);
741	skb_queue_head_init(&local->skb_queue_unreliable);
742
743	return local_to_hw(local);
744}
745EXPORT_SYMBOL(ieee80211_alloc_hw);
746
747int ieee80211_register_hw(struct ieee80211_hw *hw)
748{
749	struct ieee80211_local *local = hw_to_local(hw);
750	int result;
751	enum ieee80211_band band;
752	struct net_device *mdev;
753	struct ieee80211_master_priv *mpriv;
754
755	/*
756	 * generic code guarantees at least one band,
757	 * set this very early because much code assumes
758	 * that hw.conf.channel is assigned
759	 */
760	for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
761		struct ieee80211_supported_band *sband;
762
763		sband = local->hw.wiphy->bands[band];
764		if (sband) {
765			/* init channel we're on */
766			local->hw.conf.channel =
767			local->oper_channel =
768			local->scan_channel = &sband->channels[0];
769			break;
770		}
771	}
772
773	/* if low-level driver supports AP, we also support VLAN */
774	if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP))
775		local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
776
777	/* mac80211 always supports monitor */
778	local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
779
780	result = wiphy_register(local->hw.wiphy);
781	if (result < 0)
782		return result;
783
784	/*
785	 * We use the number of queues for feature tests (QoS, HT) internally
786	 * so restrict them appropriately.
787	 */
788	if (hw->queues > IEEE80211_MAX_QUEUES)
789		hw->queues = IEEE80211_MAX_QUEUES;
790	if (hw->ampdu_queues > IEEE80211_MAX_AMPDU_QUEUES)
791		hw->ampdu_queues = IEEE80211_MAX_AMPDU_QUEUES;
792	if (hw->queues < 4)
793		hw->ampdu_queues = 0;
794
795	mdev = alloc_netdev_mq(sizeof(struct ieee80211_master_priv),
796			       "wmaster%d", ether_setup,
797			       ieee80211_num_queues(hw));
798	if (!mdev)
799		goto fail_mdev_alloc;
800
801	mpriv = netdev_priv(mdev);
802	mpriv->local = local;
803	local->mdev = mdev;
804
805	ieee80211_rx_bss_list_init(local);
806
807	mdev->hard_start_xmit = ieee80211_master_start_xmit;
808	mdev->open = ieee80211_master_open;
809	mdev->stop = ieee80211_master_stop;
810	mdev->type = ARPHRD_IEEE80211;
811	mdev->header_ops = &ieee80211_header_ops;
812	mdev->set_multicast_list = ieee80211_master_set_multicast_list;
813
814	local->hw.workqueue =
815		create_freezeable_workqueue(wiphy_name(local->hw.wiphy));
816	if (!local->hw.workqueue) {
817		result = -ENOMEM;
818		goto fail_workqueue;
819	}
820
821	/*
822	 * The hardware needs headroom for sending the frame,
823	 * and we need some headroom for passing the frame to monitor
824	 * interfaces, but never both at the same time.
825	 */
826	local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
827				   sizeof(struct ieee80211_tx_status_rtap_hdr));
828
829	debugfs_hw_add(local);
830
831	if (local->hw.conf.beacon_int < 10)
832		local->hw.conf.beacon_int = 100;
833
834	if (local->hw.max_listen_interval == 0)
835		local->hw.max_listen_interval = 1;
836
837	local->hw.conf.listen_interval = local->hw.max_listen_interval;
838
839	local->wstats_flags |= local->hw.flags & (IEEE80211_HW_SIGNAL_UNSPEC |
840						  IEEE80211_HW_SIGNAL_DB |
841						  IEEE80211_HW_SIGNAL_DBM) ?
842			       IW_QUAL_QUAL_UPDATED : IW_QUAL_QUAL_INVALID;
843	local->wstats_flags |= local->hw.flags & IEEE80211_HW_NOISE_DBM ?
844			       IW_QUAL_NOISE_UPDATED : IW_QUAL_NOISE_INVALID;
845	if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
846		local->wstats_flags |= IW_QUAL_DBM;
847
848	result = sta_info_start(local);
849	if (result < 0)
850		goto fail_sta_info;
851
852	rtnl_lock();
853	result = dev_alloc_name(local->mdev, local->mdev->name);
854	if (result < 0)
855		goto fail_dev;
856
857	memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
858	SET_NETDEV_DEV(local->mdev, wiphy_dev(local->hw.wiphy));
859
860	result = register_netdevice(local->mdev);
861	if (result < 0)
862		goto fail_dev;
863
864	result = ieee80211_init_rate_ctrl_alg(local,
865					      hw->rate_control_algorithm);
866	if (result < 0) {
867		printk(KERN_DEBUG "%s: Failed to initialize rate control "
868		       "algorithm\n", wiphy_name(local->hw.wiphy));
869		goto fail_rate;
870	}
871
872	result = ieee80211_wep_init(local);
873
874	if (result < 0) {
875		printk(KERN_DEBUG "%s: Failed to initialize wep: %d\n",
876		       wiphy_name(local->hw.wiphy), result);
877		goto fail_wep;
878	}
879
880	local->mdev->select_queue = ieee80211_select_queue;
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	return 0;
896
897fail_wep:
898	rate_control_deinitialize(local);
899fail_rate:
900	unregister_netdevice(local->mdev);
901	local->mdev = NULL;
902fail_dev:
903	rtnl_unlock();
904	sta_info_stop(local);
905fail_sta_info:
906	debugfs_hw_del(local);
907	destroy_workqueue(local->hw.workqueue);
908fail_workqueue:
909	if (local->mdev)
910		free_netdev(local->mdev);
911fail_mdev_alloc:
912	wiphy_unregister(local->hw.wiphy);
913	return result;
914}
915EXPORT_SYMBOL(ieee80211_register_hw);
916
917void ieee80211_unregister_hw(struct ieee80211_hw *hw)
918{
919	struct ieee80211_local *local = hw_to_local(hw);
920
921	tasklet_kill(&local->tx_pending_tasklet);
922	tasklet_kill(&local->tasklet);
923
924	rtnl_lock();
925
926	/*
927	 * At this point, interface list manipulations are fine
928	 * because the driver cannot be handing us frames any
929	 * more and the tasklet is killed.
930	 */
931
932	/* First, we remove all virtual interfaces. */
933	ieee80211_remove_interfaces(local);
934
935	/* then, finally, remove the master interface */
936	unregister_netdevice(local->mdev);
937
938	rtnl_unlock();
939
940	ieee80211_rx_bss_list_deinit(local);
941	ieee80211_clear_tx_pending(local);
942	sta_info_stop(local);
943	rate_control_deinitialize(local);
944	debugfs_hw_del(local);
945
946	if (skb_queue_len(&local->skb_queue)
947			|| skb_queue_len(&local->skb_queue_unreliable))
948		printk(KERN_WARNING "%s: skb_queue not empty\n",
949		       wiphy_name(local->hw.wiphy));
950	skb_queue_purge(&local->skb_queue);
951	skb_queue_purge(&local->skb_queue_unreliable);
952
953	destroy_workqueue(local->hw.workqueue);
954	wiphy_unregister(local->hw.wiphy);
955	ieee80211_wep_free(local);
956	ieee80211_led_exit(local);
957	free_netdev(local->mdev);
958}
959EXPORT_SYMBOL(ieee80211_unregister_hw);
960
961void ieee80211_free_hw(struct ieee80211_hw *hw)
962{
963	struct ieee80211_local *local = hw_to_local(hw);
964
965	wiphy_free(local->hw.wiphy);
966}
967EXPORT_SYMBOL(ieee80211_free_hw);
968
969static int __init ieee80211_init(void)
970{
971	struct sk_buff *skb;
972	int ret;
973
974	BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
975	BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
976		     IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
977
978	ret = rc80211_minstrel_init();
979	if (ret)
980		return ret;
981
982	ret = rc80211_pid_init();
983	if (ret)
984		return ret;
985
986	ieee80211_debugfs_netdev_init();
987
988	return 0;
989}
990
991static void __exit ieee80211_exit(void)
992{
993	rc80211_pid_exit();
994	rc80211_minstrel_exit();
995
996	/*
997	 * For key todo, it'll be empty by now but the work
998	 * might still be scheduled.
999	 */
1000	flush_scheduled_work();
1001
1002	if (mesh_allocated)
1003		ieee80211s_stop();
1004
1005	ieee80211_debugfs_netdev_exit();
1006}
1007
1008
1009subsys_initcall(ieee80211_init);
1010module_exit(ieee80211_exit);
1011
1012MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1013MODULE_LICENSE("GPL");
1014