main.c revision 8dffff216fcac4f79078478085e86d68db64922e 
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		 * Goal:
247		 * HW reconfiguration should never fail, the driver has told
248		 * us what it can support so it should live up to that promise.
249		 *
250		 * Current status:
251		 * rfkill is not integrated with mac80211 and a
252		 * configuration command can thus fail if hardware rfkill
253		 * is enabled
254		 *
255		 * FIXME: integrate rfkill with mac80211 and then add this
256		 * WARN_ON() back
257		 *
258		 */
259		/* WARN_ON(ret); */
260	}
261
262	return ret;
263}
264
265void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
266				      u32 changed)
267{
268	struct ieee80211_local *local = sdata->local;
269
270	if (WARN_ON(sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
271		return;
272
273	if (!changed)
274		return;
275
276	if (local->ops->bss_info_changed)
277		local->ops->bss_info_changed(local_to_hw(local),
278					     &sdata->vif,
279					     &sdata->vif.bss_conf,
280					     changed);
281}
282
283u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
284{
285	sdata->vif.bss_conf.use_cts_prot = false;
286	sdata->vif.bss_conf.use_short_preamble = false;
287	sdata->vif.bss_conf.use_short_slot = false;
288	return BSS_CHANGED_ERP_CTS_PROT |
289	       BSS_CHANGED_ERP_PREAMBLE |
290	       BSS_CHANGED_ERP_SLOT;
291}
292
293void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
294				 struct sk_buff *skb)
295{
296	struct ieee80211_local *local = hw_to_local(hw);
297	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
298	int tmp;
299
300	skb->dev = local->mdev;
301	skb->pkt_type = IEEE80211_TX_STATUS_MSG;
302	skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ?
303		       &local->skb_queue : &local->skb_queue_unreliable, skb);
304	tmp = skb_queue_len(&local->skb_queue) +
305		skb_queue_len(&local->skb_queue_unreliable);
306	while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
307	       (skb = skb_dequeue(&local->skb_queue_unreliable))) {
308		dev_kfree_skb_irq(skb);
309		tmp--;
310		I802_DEBUG_INC(local->tx_status_drop);
311	}
312	tasklet_schedule(&local->tasklet);
313}
314EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
315
316static void ieee80211_tasklet_handler(unsigned long data)
317{
318	struct ieee80211_local *local = (struct ieee80211_local *) data;
319	struct sk_buff *skb;
320	struct ieee80211_rx_status rx_status;
321	struct ieee80211_ra_tid *ra_tid;
322
323	while ((skb = skb_dequeue(&local->skb_queue)) ||
324	       (skb = skb_dequeue(&local->skb_queue_unreliable))) {
325		switch (skb->pkt_type) {
326		case IEEE80211_RX_MSG:
327			/* status is in skb->cb */
328			memcpy(&rx_status, skb->cb, sizeof(rx_status));
329			/* Clear skb->pkt_type in order to not confuse kernel
330			 * netstack. */
331			skb->pkt_type = 0;
332			__ieee80211_rx(local_to_hw(local), skb, &rx_status);
333			break;
334		case IEEE80211_TX_STATUS_MSG:
335			skb->pkt_type = 0;
336			ieee80211_tx_status(local_to_hw(local), skb);
337			break;
338		case IEEE80211_DELBA_MSG:
339			ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
340			ieee80211_stop_tx_ba_cb(local_to_hw(local),
341						ra_tid->ra, ra_tid->tid);
342			dev_kfree_skb(skb);
343			break;
344		case IEEE80211_ADDBA_MSG:
345			ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
346			ieee80211_start_tx_ba_cb(local_to_hw(local),
347						 ra_tid->ra, ra_tid->tid);
348			dev_kfree_skb(skb);
349			break ;
350		default:
351			WARN_ON(1);
352			dev_kfree_skb(skb);
353			break;
354		}
355	}
356}
357
358/* Remove added headers (e.g., QoS control), encryption header/MIC, etc. to
359 * make a prepared TX frame (one that has been given to hw) to look like brand
360 * new IEEE 802.11 frame that is ready to go through TX processing again.
361 */
362static void ieee80211_remove_tx_extra(struct ieee80211_local *local,
363				      struct ieee80211_key *key,
364				      struct sk_buff *skb)
365{
366	unsigned int hdrlen, iv_len, mic_len;
367	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
368
369	hdrlen = ieee80211_hdrlen(hdr->frame_control);
370
371	if (!key)
372		goto no_key;
373
374	switch (key->conf.alg) {
375	case ALG_WEP:
376		iv_len = WEP_IV_LEN;
377		mic_len = WEP_ICV_LEN;
378		break;
379	case ALG_TKIP:
380		iv_len = TKIP_IV_LEN;
381		mic_len = TKIP_ICV_LEN;
382		break;
383	case ALG_CCMP:
384		iv_len = CCMP_HDR_LEN;
385		mic_len = CCMP_MIC_LEN;
386		break;
387	default:
388		goto no_key;
389	}
390
391	if (skb->len >= hdrlen + mic_len &&
392	    !(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
393		skb_trim(skb, skb->len - mic_len);
394	if (skb->len >= hdrlen + iv_len) {
395		memmove(skb->data + iv_len, skb->data, hdrlen);
396		hdr = (struct ieee80211_hdr *)skb_pull(skb, iv_len);
397	}
398
399no_key:
400	if (ieee80211_is_data_qos(hdr->frame_control)) {
401		hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
402		memmove(skb->data + IEEE80211_QOS_CTL_LEN, skb->data,
403			hdrlen - IEEE80211_QOS_CTL_LEN);
404		skb_pull(skb, IEEE80211_QOS_CTL_LEN);
405	}
406}
407
408static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
409					    struct sta_info *sta,
410					    struct sk_buff *skb)
411{
412	sta->tx_filtered_count++;
413
414	/*
415	 * Clear the TX filter mask for this STA when sending the next
416	 * packet. If the STA went to power save mode, this will happen
417	 * when it wakes up for the next time.
418	 */
419	set_sta_flags(sta, WLAN_STA_CLEAR_PS_FILT);
420
421	/*
422	 * This code races in the following way:
423	 *
424	 *  (1) STA sends frame indicating it will go to sleep and does so
425	 *  (2) hardware/firmware adds STA to filter list, passes frame up
426	 *  (3) hardware/firmware processes TX fifo and suppresses a frame
427	 *  (4) we get TX status before having processed the frame and
428	 *	knowing that the STA has gone to sleep.
429	 *
430	 * This is actually quite unlikely even when both those events are
431	 * processed from interrupts coming in quickly after one another or
432	 * even at the same time because we queue both TX status events and
433	 * RX frames to be processed by a tasklet and process them in the
434	 * same order that they were received or TX status last. Hence, there
435	 * is no race as long as the frame RX is processed before the next TX
436	 * status, which drivers can ensure, see below.
437	 *
438	 * Note that this can only happen if the hardware or firmware can
439	 * actually add STAs to the filter list, if this is done by the
440	 * driver in response to set_tim() (which will only reduce the race
441	 * this whole filtering tries to solve, not completely solve it)
442	 * this situation cannot happen.
443	 *
444	 * To completely solve this race drivers need to make sure that they
445	 *  (a) don't mix the irq-safe/not irq-safe TX status/RX processing
446	 *	functions and
447	 *  (b) always process RX events before TX status events if ordering
448	 *      can be unknown, for example with different interrupt status
449	 *	bits.
450	 */
451	if (test_sta_flags(sta, WLAN_STA_PS) &&
452	    skb_queue_len(&sta->tx_filtered) < STA_MAX_TX_BUFFER) {
453		ieee80211_remove_tx_extra(local, sta->key, skb);
454		skb_queue_tail(&sta->tx_filtered, skb);
455		return;
456	}
457
458	if (!test_sta_flags(sta, WLAN_STA_PS) && !skb->requeue) {
459		/* Software retry the packet once */
460		skb->requeue = 1;
461		ieee80211_remove_tx_extra(local, sta->key, skb);
462		dev_queue_xmit(skb);
463		return;
464	}
465
466#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
467	if (net_ratelimit())
468		printk(KERN_DEBUG "%s: dropped TX filtered frame, "
469		       "queue_len=%d PS=%d @%lu\n",
470		       wiphy_name(local->hw.wiphy),
471		       skb_queue_len(&sta->tx_filtered),
472		       !!test_sta_flags(sta, WLAN_STA_PS), jiffies);
473#endif
474	dev_kfree_skb(skb);
475}
476
477void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
478{
479	struct sk_buff *skb2;
480	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
481	struct ieee80211_local *local = hw_to_local(hw);
482	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
483	u16 frag, type;
484	__le16 fc;
485	struct ieee80211_supported_band *sband;
486	struct ieee80211_tx_status_rtap_hdr *rthdr;
487	struct ieee80211_sub_if_data *sdata;
488	struct net_device *prev_dev = NULL;
489	struct sta_info *sta;
490	int retry_count = -1, i;
491
492	for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
493		/* the HW cannot have attempted that rate */
494		if (i >= hw->max_rates) {
495			info->status.rates[i].idx = -1;
496			info->status.rates[i].count = 0;
497		}
498
499		retry_count += info->status.rates[i].count;
500	}
501	if (retry_count < 0)
502		retry_count = 0;
503
504	rcu_read_lock();
505
506	sband = local->hw.wiphy->bands[info->band];
507
508	sta = sta_info_get(local, hdr->addr1);
509
510	if (sta) {
511		if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
512		    test_sta_flags(sta, WLAN_STA_PS)) {
513			/*
514			 * The STA is in power save mode, so assume
515			 * that this TX packet failed because of that.
516			 */
517			ieee80211_handle_filtered_frame(local, sta, skb);
518			rcu_read_unlock();
519			return;
520		}
521
522		fc = hdr->frame_control;
523
524		if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
525		    (ieee80211_is_data_qos(fc))) {
526			u16 tid, ssn;
527			u8 *qc;
528
529			qc = ieee80211_get_qos_ctl(hdr);
530			tid = qc[0] & 0xf;
531			ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
532						& IEEE80211_SCTL_SEQ);
533			ieee80211_send_bar(sta->sdata, hdr->addr1,
534					   tid, ssn);
535		}
536
537		if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
538			ieee80211_handle_filtered_frame(local, sta, skb);
539			rcu_read_unlock();
540			return;
541		} else {
542			if (!(info->flags & IEEE80211_TX_STAT_ACK))
543				sta->tx_retry_failed++;
544			sta->tx_retry_count += retry_count;
545		}
546
547		rate_control_tx_status(local, sband, sta, skb);
548	}
549
550	rcu_read_unlock();
551
552	ieee80211_led_tx(local, 0);
553
554	/* SNMP counters
555	 * Fragments are passed to low-level drivers as separate skbs, so these
556	 * are actually fragments, not frames. Update frame counters only for
557	 * the first fragment of the frame. */
558
559	frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG;
560	type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE;
561
562	if (info->flags & IEEE80211_TX_STAT_ACK) {
563		if (frag == 0) {
564			local->dot11TransmittedFrameCount++;
565			if (is_multicast_ether_addr(hdr->addr1))
566				local->dot11MulticastTransmittedFrameCount++;
567			if (retry_count > 0)
568				local->dot11RetryCount++;
569			if (retry_count > 1)
570				local->dot11MultipleRetryCount++;
571		}
572
573		/* This counter shall be incremented for an acknowledged MPDU
574		 * with an individual address in the address 1 field or an MPDU
575		 * with a multicast address in the address 1 field of type Data
576		 * or Management. */
577		if (!is_multicast_ether_addr(hdr->addr1) ||
578		    type == IEEE80211_FTYPE_DATA ||
579		    type == IEEE80211_FTYPE_MGMT)
580			local->dot11TransmittedFragmentCount++;
581	} else {
582		if (frag == 0)
583			local->dot11FailedCount++;
584	}
585
586	/* this was a transmitted frame, but now we want to reuse it */
587	skb_orphan(skb);
588
589	/*
590	 * This is a bit racy but we can avoid a lot of work
591	 * with this test...
592	 */
593	if (!local->monitors && !local->cooked_mntrs) {
594		dev_kfree_skb(skb);
595		return;
596	}
597
598	/* send frame to monitor interfaces now */
599
600	if (skb_headroom(skb) < sizeof(*rthdr)) {
601		printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
602		dev_kfree_skb(skb);
603		return;
604	}
605
606	rthdr = (struct ieee80211_tx_status_rtap_hdr *)
607				skb_push(skb, sizeof(*rthdr));
608
609	memset(rthdr, 0, sizeof(*rthdr));
610	rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
611	rthdr->hdr.it_present =
612		cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
613			    (1 << IEEE80211_RADIOTAP_DATA_RETRIES) |
614			    (1 << IEEE80211_RADIOTAP_RATE));
615
616	if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
617	    !is_multicast_ether_addr(hdr->addr1))
618		rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL);
619
620	/*
621	 * XXX: Once radiotap gets the bitmap reset thing the vendor
622	 *	extensions proposal contains, we can actually report
623	 *	the whole set of tries we did.
624	 */
625	if ((info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) ||
626	    (info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT))
627		rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS);
628	else if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS)
629		rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS);
630	if (info->status.rates[0].idx >= 0 &&
631	    !(info->status.rates[0].flags & IEEE80211_TX_RC_MCS))
632		rthdr->rate = sband->bitrates[
633				info->status.rates[0].idx].bitrate / 5;
634
635	/* for now report the total retry_count */
636	rthdr->data_retries = retry_count;
637
638	/* XXX: is this sufficient for BPF? */
639	skb_set_mac_header(skb, 0);
640	skb->ip_summed = CHECKSUM_UNNECESSARY;
641	skb->pkt_type = PACKET_OTHERHOST;
642	skb->protocol = htons(ETH_P_802_2);
643	memset(skb->cb, 0, sizeof(skb->cb));
644
645	rcu_read_lock();
646	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
647		if (sdata->vif.type == NL80211_IFTYPE_MONITOR) {
648			if (!netif_running(sdata->dev))
649				continue;
650
651			if (prev_dev) {
652				skb2 = skb_clone(skb, GFP_ATOMIC);
653				if (skb2) {
654					skb2->dev = prev_dev;
655					netif_rx(skb2);
656				}
657			}
658
659			prev_dev = sdata->dev;
660		}
661	}
662	if (prev_dev) {
663		skb->dev = prev_dev;
664		netif_rx(skb);
665		skb = NULL;
666	}
667	rcu_read_unlock();
668	dev_kfree_skb(skb);
669}
670EXPORT_SYMBOL(ieee80211_tx_status);
671
672struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
673					const struct ieee80211_ops *ops)
674{
675	struct ieee80211_local *local;
676	int priv_size;
677	struct wiphy *wiphy;
678
679	/* Ensure 32-byte alignment of our private data and hw private data.
680	 * We use the wiphy priv data for both our ieee80211_local and for
681	 * the driver's private data
682	 *
683	 * In memory it'll be like this:
684	 *
685	 * +-------------------------+
686	 * | struct wiphy	    |
687	 * +-------------------------+
688	 * | struct ieee80211_local  |
689	 * +-------------------------+
690	 * | driver's private data   |
691	 * +-------------------------+
692	 *
693	 */
694	priv_size = ((sizeof(struct ieee80211_local) +
695		      NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST) +
696		    priv_data_len;
697
698	wiphy = wiphy_new(&mac80211_config_ops, priv_size);
699
700	if (!wiphy)
701		return NULL;
702
703	wiphy->privid = mac80211_wiphy_privid;
704
705	local = wiphy_priv(wiphy);
706	local->hw.wiphy = wiphy;
707
708	local->hw.priv = (char *)local +
709			 ((sizeof(struct ieee80211_local) +
710			   NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);
711
712	BUG_ON(!ops->tx);
713	BUG_ON(!ops->start);
714	BUG_ON(!ops->stop);
715	BUG_ON(!ops->config);
716	BUG_ON(!ops->add_interface);
717	BUG_ON(!ops->remove_interface);
718	BUG_ON(!ops->configure_filter);
719	local->ops = ops;
720
721	/* set up some defaults */
722	local->hw.queues = 1;
723	local->hw.max_rates = 1;
724	local->rts_threshold = IEEE80211_MAX_RTS_THRESHOLD;
725	local->fragmentation_threshold = IEEE80211_MAX_FRAG_THRESHOLD;
726	local->hw.conf.long_frame_max_tx_count = 4;
727	local->hw.conf.short_frame_max_tx_count = 7;
728	local->hw.conf.radio_enabled = true;
729
730	INIT_LIST_HEAD(&local->interfaces);
731
732	spin_lock_init(&local->key_lock);
733
734	INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
735
736	sta_info_init(local);
737
738	tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
739		     (unsigned long)local);
740	tasklet_disable(&local->tx_pending_tasklet);
741
742	tasklet_init(&local->tasklet,
743		     ieee80211_tasklet_handler,
744		     (unsigned long) local);
745	tasklet_disable(&local->tasklet);
746
747	skb_queue_head_init(&local->skb_queue);
748	skb_queue_head_init(&local->skb_queue_unreliable);
749
750	return local_to_hw(local);
751}
752EXPORT_SYMBOL(ieee80211_alloc_hw);
753
754int ieee80211_register_hw(struct ieee80211_hw *hw)
755{
756	struct ieee80211_local *local = hw_to_local(hw);
757	int result;
758	enum ieee80211_band band;
759	struct net_device *mdev;
760	struct ieee80211_master_priv *mpriv;
761
762	/*
763	 * generic code guarantees at least one band,
764	 * set this very early because much code assumes
765	 * that hw.conf.channel is assigned
766	 */
767	for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
768		struct ieee80211_supported_band *sband;
769
770		sband = local->hw.wiphy->bands[band];
771		if (sband) {
772			/* init channel we're on */
773			local->hw.conf.channel =
774			local->oper_channel =
775			local->scan_channel = &sband->channels[0];
776			break;
777		}
778	}
779
780	/* if low-level driver supports AP, we also support VLAN */
781	if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP))
782		local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
783
784	/* mac80211 always supports monitor */
785	local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
786
787	result = wiphy_register(local->hw.wiphy);
788	if (result < 0)
789		return result;
790
791	/*
792	 * We use the number of queues for feature tests (QoS, HT) internally
793	 * so restrict them appropriately.
794	 */
795	if (hw->queues > IEEE80211_MAX_QUEUES)
796		hw->queues = IEEE80211_MAX_QUEUES;
797	if (hw->ampdu_queues > IEEE80211_MAX_AMPDU_QUEUES)
798		hw->ampdu_queues = IEEE80211_MAX_AMPDU_QUEUES;
799	if (hw->queues < 4)
800		hw->ampdu_queues = 0;
801
802	mdev = alloc_netdev_mq(sizeof(struct ieee80211_master_priv),
803			       "wmaster%d", ether_setup,
804			       ieee80211_num_queues(hw));
805	if (!mdev)
806		goto fail_mdev_alloc;
807
808	mpriv = netdev_priv(mdev);
809	mpriv->local = local;
810	local->mdev = mdev;
811
812	ieee80211_rx_bss_list_init(local);
813
814	mdev->hard_start_xmit = ieee80211_master_start_xmit;
815	mdev->open = ieee80211_master_open;
816	mdev->stop = ieee80211_master_stop;
817	mdev->type = ARPHRD_IEEE80211;
818	mdev->header_ops = &ieee80211_header_ops;
819	mdev->set_multicast_list = ieee80211_master_set_multicast_list;
820
821	local->hw.workqueue =
822		create_freezeable_workqueue(wiphy_name(local->hw.wiphy));
823	if (!local->hw.workqueue) {
824		result = -ENOMEM;
825		goto fail_workqueue;
826	}
827
828	/*
829	 * The hardware needs headroom for sending the frame,
830	 * and we need some headroom for passing the frame to monitor
831	 * interfaces, but never both at the same time.
832	 */
833	local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
834				   sizeof(struct ieee80211_tx_status_rtap_hdr));
835
836	debugfs_hw_add(local);
837
838	if (local->hw.conf.beacon_int < 10)
839		local->hw.conf.beacon_int = 100;
840
841	if (local->hw.max_listen_interval == 0)
842		local->hw.max_listen_interval = 1;
843
844	local->hw.conf.listen_interval = local->hw.max_listen_interval;
845
846	local->wstats_flags |= local->hw.flags & (IEEE80211_HW_SIGNAL_UNSPEC |
847						  IEEE80211_HW_SIGNAL_DB |
848						  IEEE80211_HW_SIGNAL_DBM) ?
849			       IW_QUAL_QUAL_UPDATED : IW_QUAL_QUAL_INVALID;
850	local->wstats_flags |= local->hw.flags & IEEE80211_HW_NOISE_DBM ?
851			       IW_QUAL_NOISE_UPDATED : IW_QUAL_NOISE_INVALID;
852	if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
853		local->wstats_flags |= IW_QUAL_DBM;
854
855	result = sta_info_start(local);
856	if (result < 0)
857		goto fail_sta_info;
858
859	rtnl_lock();
860	result = dev_alloc_name(local->mdev, local->mdev->name);
861	if (result < 0)
862		goto fail_dev;
863
864	memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
865	SET_NETDEV_DEV(local->mdev, wiphy_dev(local->hw.wiphy));
866
867	result = register_netdevice(local->mdev);
868	if (result < 0)
869		goto fail_dev;
870
871	result = ieee80211_init_rate_ctrl_alg(local,
872					      hw->rate_control_algorithm);
873	if (result < 0) {
874		printk(KERN_DEBUG "%s: Failed to initialize rate control "
875		       "algorithm\n", wiphy_name(local->hw.wiphy));
876		goto fail_rate;
877	}
878
879	result = ieee80211_wep_init(local);
880
881	if (result < 0) {
882		printk(KERN_DEBUG "%s: Failed to initialize wep: %d\n",
883		       wiphy_name(local->hw.wiphy), result);
884		goto fail_wep;
885	}
886
887	local->mdev->select_queue = ieee80211_select_queue;
888
889	/* add one default STA interface if supported */
890	if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
891		result = ieee80211_if_add(local, "wlan%d", NULL,
892					  NL80211_IFTYPE_STATION, NULL);
893		if (result)
894			printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
895			       wiphy_name(local->hw.wiphy));
896	}
897
898	rtnl_unlock();
899
900	ieee80211_led_init(local);
901
902	return 0;
903
904fail_wep:
905	rate_control_deinitialize(local);
906fail_rate:
907	unregister_netdevice(local->mdev);
908	local->mdev = NULL;
909fail_dev:
910	rtnl_unlock();
911	sta_info_stop(local);
912fail_sta_info:
913	debugfs_hw_del(local);
914	destroy_workqueue(local->hw.workqueue);
915fail_workqueue:
916	if (local->mdev)
917		free_netdev(local->mdev);
918fail_mdev_alloc:
919	wiphy_unregister(local->hw.wiphy);
920	return result;
921}
922EXPORT_SYMBOL(ieee80211_register_hw);
923
924void ieee80211_unregister_hw(struct ieee80211_hw *hw)
925{
926	struct ieee80211_local *local = hw_to_local(hw);
927
928	tasklet_kill(&local->tx_pending_tasklet);
929	tasklet_kill(&local->tasklet);
930
931	rtnl_lock();
932
933	/*
934	 * At this point, interface list manipulations are fine
935	 * because the driver cannot be handing us frames any
936	 * more and the tasklet is killed.
937	 */
938
939	/* First, we remove all virtual interfaces. */
940	ieee80211_remove_interfaces(local);
941
942	/* then, finally, remove the master interface */
943	unregister_netdevice(local->mdev);
944
945	rtnl_unlock();
946
947	ieee80211_rx_bss_list_deinit(local);
948	ieee80211_clear_tx_pending(local);
949	sta_info_stop(local);
950	rate_control_deinitialize(local);
951	debugfs_hw_del(local);
952
953	if (skb_queue_len(&local->skb_queue)
954			|| skb_queue_len(&local->skb_queue_unreliable))
955		printk(KERN_WARNING "%s: skb_queue not empty\n",
956		       wiphy_name(local->hw.wiphy));
957	skb_queue_purge(&local->skb_queue);
958	skb_queue_purge(&local->skb_queue_unreliable);
959
960	destroy_workqueue(local->hw.workqueue);
961	wiphy_unregister(local->hw.wiphy);
962	ieee80211_wep_free(local);
963	ieee80211_led_exit(local);
964	free_netdev(local->mdev);
965}
966EXPORT_SYMBOL(ieee80211_unregister_hw);
967
968void ieee80211_free_hw(struct ieee80211_hw *hw)
969{
970	struct ieee80211_local *local = hw_to_local(hw);
971
972	wiphy_free(local->hw.wiphy);
973}
974EXPORT_SYMBOL(ieee80211_free_hw);
975
976static int __init ieee80211_init(void)
977{
978	struct sk_buff *skb;
979	int ret;
980
981	BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
982	BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
983		     IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
984
985	ret = rc80211_minstrel_init();
986	if (ret)
987		return ret;
988
989	ret = rc80211_pid_init();
990	if (ret)
991		return ret;
992
993	ieee80211_debugfs_netdev_init();
994
995	return 0;
996}
997
998static void __exit ieee80211_exit(void)
999{
1000	rc80211_pid_exit();
1001	rc80211_minstrel_exit();
1002
1003	/*
1004	 * For key todo, it'll be empty by now but the work
1005	 * might still be scheduled.
1006	 */
1007	flush_scheduled_work();
1008
1009	if (mesh_allocated)
1010		ieee80211s_stop();
1011
1012	ieee80211_debugfs_netdev_exit();
1013}
1014
1015
1016subsys_initcall(ieee80211_init);
1017module_exit(ieee80211_exit);
1018
1019MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1020MODULE_LICENSE("GPL");
1021