main.c revision 469002983fc90c2ff0959e2b03335c0fe2e4d5a9
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
172	if (sdata->vif.type == NL80211_IFTYPE_STATION)
173		conf.bssid = sdata->u.mgd.bssid;
174	else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
175		conf.bssid = sdata->u.ibss.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		static const u8 zero[ETH_ALEN] = { 0 };
180		conf.bssid = zero;
181	} else {
182		WARN_ON(1);
183		return -EINVAL;
184	}
185
186	switch (sdata->vif.type) {
187	case NL80211_IFTYPE_AP:
188	case NL80211_IFTYPE_ADHOC:
189	case NL80211_IFTYPE_MESH_POINT:
190		break;
191	default:
192		/* do not warn to simplify caller in scan.c */
193		changed &= ~IEEE80211_IFCC_BEACON_ENABLED;
194		if (WARN_ON(changed & IEEE80211_IFCC_BEACON))
195			return -EINVAL;
196		changed &= ~IEEE80211_IFCC_BEACON;
197		break;
198	}
199
200	if (changed & IEEE80211_IFCC_BEACON_ENABLED) {
201		if (local->sw_scanning) {
202			conf.enable_beacon = false;
203		} else {
204			/*
205			 * Beacon should be enabled, but AP mode must
206			 * check whether there is a beacon configured.
207			 */
208			switch (sdata->vif.type) {
209			case NL80211_IFTYPE_AP:
210				conf.enable_beacon =
211					!!rcu_dereference(sdata->u.ap.beacon);
212				break;
213			case NL80211_IFTYPE_ADHOC:
214				conf.enable_beacon = !!sdata->u.ibss.probe_resp;
215				break;
216			case NL80211_IFTYPE_MESH_POINT:
217				conf.enable_beacon = true;
218				break;
219			default:
220				/* not reached */
221				WARN_ON(1);
222				break;
223			}
224		}
225	}
226
227	if (WARN_ON(!conf.bssid && (changed & IEEE80211_IFCC_BSSID)))
228		return -EINVAL;
229
230	conf.changed = changed;
231
232	return local->ops->config_interface(local_to_hw(local),
233					    &sdata->vif, &conf);
234}
235
236int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
237{
238	struct ieee80211_channel *chan;
239	int ret = 0;
240	int power;
241	enum nl80211_channel_type channel_type;
242
243	might_sleep();
244
245	if (local->sw_scanning) {
246		chan = local->scan_channel;
247		channel_type = NL80211_CHAN_NO_HT;
248	} else {
249		chan = local->oper_channel;
250		channel_type = local->oper_channel_type;
251	}
252
253	if (chan != local->hw.conf.channel ||
254	    channel_type != local->hw.conf.channel_type) {
255		local->hw.conf.channel = chan;
256		local->hw.conf.channel_type = channel_type;
257		changed |= IEEE80211_CONF_CHANGE_CHANNEL;
258	}
259
260	if (local->sw_scanning)
261		power = chan->max_power;
262	else
263		power = local->power_constr_level ?
264			(chan->max_power - local->power_constr_level) :
265			chan->max_power;
266
267	if (local->user_power_level)
268		power = min(power, local->user_power_level);
269
270	if (local->hw.conf.power_level != power) {
271		changed |= IEEE80211_CONF_CHANGE_POWER;
272		local->hw.conf.power_level = power;
273	}
274
275	if (changed && local->open_count) {
276		ret = local->ops->config(local_to_hw(local), changed);
277		/*
278		 * Goal:
279		 * HW reconfiguration should never fail, the driver has told
280		 * us what it can support so it should live up to that promise.
281		 *
282		 * Current status:
283		 * rfkill is not integrated with mac80211 and a
284		 * configuration command can thus fail if hardware rfkill
285		 * is enabled
286		 *
287		 * FIXME: integrate rfkill with mac80211 and then add this
288		 * WARN_ON() back
289		 *
290		 */
291		/* WARN_ON(ret); */
292	}
293
294	return ret;
295}
296
297void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
298				      u32 changed)
299{
300	struct ieee80211_local *local = sdata->local;
301
302	if (WARN_ON(sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
303		return;
304
305	if (!changed)
306		return;
307
308	if (local->ops->bss_info_changed)
309		local->ops->bss_info_changed(local_to_hw(local),
310					     &sdata->vif,
311					     &sdata->vif.bss_conf,
312					     changed);
313}
314
315u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
316{
317	sdata->vif.bss_conf.use_cts_prot = false;
318	sdata->vif.bss_conf.use_short_preamble = false;
319	sdata->vif.bss_conf.use_short_slot = false;
320	return BSS_CHANGED_ERP_CTS_PROT |
321	       BSS_CHANGED_ERP_PREAMBLE |
322	       BSS_CHANGED_ERP_SLOT;
323}
324
325void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
326				 struct sk_buff *skb)
327{
328	struct ieee80211_local *local = hw_to_local(hw);
329	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
330	int tmp;
331
332	skb->dev = local->mdev;
333	skb->pkt_type = IEEE80211_TX_STATUS_MSG;
334	skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ?
335		       &local->skb_queue : &local->skb_queue_unreliable, skb);
336	tmp = skb_queue_len(&local->skb_queue) +
337		skb_queue_len(&local->skb_queue_unreliable);
338	while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
339	       (skb = skb_dequeue(&local->skb_queue_unreliable))) {
340		dev_kfree_skb_irq(skb);
341		tmp--;
342		I802_DEBUG_INC(local->tx_status_drop);
343	}
344	tasklet_schedule(&local->tasklet);
345}
346EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
347
348static void ieee80211_tasklet_handler(unsigned long data)
349{
350	struct ieee80211_local *local = (struct ieee80211_local *) data;
351	struct sk_buff *skb;
352	struct ieee80211_rx_status rx_status;
353	struct ieee80211_ra_tid *ra_tid;
354
355	while ((skb = skb_dequeue(&local->skb_queue)) ||
356	       (skb = skb_dequeue(&local->skb_queue_unreliable))) {
357		switch (skb->pkt_type) {
358		case IEEE80211_RX_MSG:
359			/* status is in skb->cb */
360			memcpy(&rx_status, skb->cb, sizeof(rx_status));
361			/* Clear skb->pkt_type in order to not confuse kernel
362			 * netstack. */
363			skb->pkt_type = 0;
364			__ieee80211_rx(local_to_hw(local), skb, &rx_status);
365			break;
366		case IEEE80211_TX_STATUS_MSG:
367			skb->pkt_type = 0;
368			ieee80211_tx_status(local_to_hw(local), skb);
369			break;
370		case IEEE80211_DELBA_MSG:
371			ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
372			ieee80211_stop_tx_ba_cb(local_to_hw(local),
373						ra_tid->ra, ra_tid->tid);
374			dev_kfree_skb(skb);
375			break;
376		case IEEE80211_ADDBA_MSG:
377			ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
378			ieee80211_start_tx_ba_cb(local_to_hw(local),
379						 ra_tid->ra, ra_tid->tid);
380			dev_kfree_skb(skb);
381			break ;
382		default:
383			WARN(1, "mac80211: Packet is of unknown type %d\n",
384			     skb->pkt_type);
385			dev_kfree_skb(skb);
386			break;
387		}
388	}
389}
390
391/* Remove added headers (e.g., QoS control), encryption header/MIC, etc. to
392 * make a prepared TX frame (one that has been given to hw) to look like brand
393 * new IEEE 802.11 frame that is ready to go through TX processing again.
394 */
395static void ieee80211_remove_tx_extra(struct ieee80211_local *local,
396				      struct ieee80211_key *key,
397				      struct sk_buff *skb)
398{
399	unsigned int hdrlen, iv_len, mic_len;
400	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
401
402	hdrlen = ieee80211_hdrlen(hdr->frame_control);
403
404	if (!key)
405		goto no_key;
406
407	switch (key->conf.alg) {
408	case ALG_WEP:
409		iv_len = WEP_IV_LEN;
410		mic_len = WEP_ICV_LEN;
411		break;
412	case ALG_TKIP:
413		iv_len = TKIP_IV_LEN;
414		mic_len = TKIP_ICV_LEN;
415		break;
416	case ALG_CCMP:
417		iv_len = CCMP_HDR_LEN;
418		mic_len = CCMP_MIC_LEN;
419		break;
420	default:
421		goto no_key;
422	}
423
424	if (skb->len >= hdrlen + mic_len &&
425	    !(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
426		skb_trim(skb, skb->len - mic_len);
427	if (skb->len >= hdrlen + iv_len) {
428		memmove(skb->data + iv_len, skb->data, hdrlen);
429		hdr = (struct ieee80211_hdr *)skb_pull(skb, iv_len);
430	}
431
432no_key:
433	if (ieee80211_is_data_qos(hdr->frame_control)) {
434		hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
435		memmove(skb->data + IEEE80211_QOS_CTL_LEN, skb->data,
436			hdrlen - IEEE80211_QOS_CTL_LEN);
437		skb_pull(skb, IEEE80211_QOS_CTL_LEN);
438	}
439}
440
441static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
442					    struct sta_info *sta,
443					    struct sk_buff *skb)
444{
445	sta->tx_filtered_count++;
446
447	/*
448	 * Clear the TX filter mask for this STA when sending the next
449	 * packet. If the STA went to power save mode, this will happen
450	 * when it wakes up for the next time.
451	 */
452	set_sta_flags(sta, WLAN_STA_CLEAR_PS_FILT);
453
454	/*
455	 * This code races in the following way:
456	 *
457	 *  (1) STA sends frame indicating it will go to sleep and does so
458	 *  (2) hardware/firmware adds STA to filter list, passes frame up
459	 *  (3) hardware/firmware processes TX fifo and suppresses a frame
460	 *  (4) we get TX status before having processed the frame and
461	 *	knowing that the STA has gone to sleep.
462	 *
463	 * This is actually quite unlikely even when both those events are
464	 * processed from interrupts coming in quickly after one another or
465	 * even at the same time because we queue both TX status events and
466	 * RX frames to be processed by a tasklet and process them in the
467	 * same order that they were received or TX status last. Hence, there
468	 * is no race as long as the frame RX is processed before the next TX
469	 * status, which drivers can ensure, see below.
470	 *
471	 * Note that this can only happen if the hardware or firmware can
472	 * actually add STAs to the filter list, if this is done by the
473	 * driver in response to set_tim() (which will only reduce the race
474	 * this whole filtering tries to solve, not completely solve it)
475	 * this situation cannot happen.
476	 *
477	 * To completely solve this race drivers need to make sure that they
478	 *  (a) don't mix the irq-safe/not irq-safe TX status/RX processing
479	 *	functions and
480	 *  (b) always process RX events before TX status events if ordering
481	 *      can be unknown, for example with different interrupt status
482	 *	bits.
483	 */
484	if (test_sta_flags(sta, WLAN_STA_PS) &&
485	    skb_queue_len(&sta->tx_filtered) < STA_MAX_TX_BUFFER) {
486		ieee80211_remove_tx_extra(local, sta->key, skb);
487		skb_queue_tail(&sta->tx_filtered, skb);
488		return;
489	}
490
491	if (!test_sta_flags(sta, WLAN_STA_PS) && !skb->requeue) {
492		/* Software retry the packet once */
493		skb->requeue = 1;
494		ieee80211_remove_tx_extra(local, sta->key, skb);
495		dev_queue_xmit(skb);
496		return;
497	}
498
499#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
500	if (net_ratelimit())
501		printk(KERN_DEBUG "%s: dropped TX filtered frame, "
502		       "queue_len=%d PS=%d @%lu\n",
503		       wiphy_name(local->hw.wiphy),
504		       skb_queue_len(&sta->tx_filtered),
505		       !!test_sta_flags(sta, WLAN_STA_PS), jiffies);
506#endif
507	dev_kfree_skb(skb);
508}
509
510void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
511{
512	struct sk_buff *skb2;
513	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
514	struct ieee80211_local *local = hw_to_local(hw);
515	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
516	u16 frag, type;
517	__le16 fc;
518	struct ieee80211_supported_band *sband;
519	struct ieee80211_tx_status_rtap_hdr *rthdr;
520	struct ieee80211_sub_if_data *sdata;
521	struct net_device *prev_dev = NULL;
522	struct sta_info *sta;
523	int retry_count = -1, i;
524
525	for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
526		/* the HW cannot have attempted that rate */
527		if (i >= hw->max_rates) {
528			info->status.rates[i].idx = -1;
529			info->status.rates[i].count = 0;
530		}
531
532		retry_count += info->status.rates[i].count;
533	}
534	if (retry_count < 0)
535		retry_count = 0;
536
537	rcu_read_lock();
538
539	sband = local->hw.wiphy->bands[info->band];
540
541	sta = sta_info_get(local, hdr->addr1);
542
543	if (sta) {
544		if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
545		    test_sta_flags(sta, WLAN_STA_PS)) {
546			/*
547			 * The STA is in power save mode, so assume
548			 * that this TX packet failed because of that.
549			 */
550			ieee80211_handle_filtered_frame(local, sta, skb);
551			rcu_read_unlock();
552			return;
553		}
554
555		fc = hdr->frame_control;
556
557		if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
558		    (ieee80211_is_data_qos(fc))) {
559			u16 tid, ssn;
560			u8 *qc;
561
562			qc = ieee80211_get_qos_ctl(hdr);
563			tid = qc[0] & 0xf;
564			ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
565						& IEEE80211_SCTL_SEQ);
566			ieee80211_send_bar(sta->sdata, hdr->addr1,
567					   tid, ssn);
568		}
569
570		if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
571			ieee80211_handle_filtered_frame(local, sta, skb);
572			rcu_read_unlock();
573			return;
574		} else {
575			if (!(info->flags & IEEE80211_TX_STAT_ACK))
576				sta->tx_retry_failed++;
577			sta->tx_retry_count += retry_count;
578		}
579
580		rate_control_tx_status(local, sband, sta, skb);
581	}
582
583	rcu_read_unlock();
584
585	ieee80211_led_tx(local, 0);
586
587	/* SNMP counters
588	 * Fragments are passed to low-level drivers as separate skbs, so these
589	 * are actually fragments, not frames. Update frame counters only for
590	 * the first fragment of the frame. */
591
592	frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG;
593	type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE;
594
595	if (info->flags & IEEE80211_TX_STAT_ACK) {
596		if (frag == 0) {
597			local->dot11TransmittedFrameCount++;
598			if (is_multicast_ether_addr(hdr->addr1))
599				local->dot11MulticastTransmittedFrameCount++;
600			if (retry_count > 0)
601				local->dot11RetryCount++;
602			if (retry_count > 1)
603				local->dot11MultipleRetryCount++;
604		}
605
606		/* This counter shall be incremented for an acknowledged MPDU
607		 * with an individual address in the address 1 field or an MPDU
608		 * with a multicast address in the address 1 field of type Data
609		 * or Management. */
610		if (!is_multicast_ether_addr(hdr->addr1) ||
611		    type == IEEE80211_FTYPE_DATA ||
612		    type == IEEE80211_FTYPE_MGMT)
613			local->dot11TransmittedFragmentCount++;
614	} else {
615		if (frag == 0)
616			local->dot11FailedCount++;
617	}
618
619	/* this was a transmitted frame, but now we want to reuse it */
620	skb_orphan(skb);
621
622	/*
623	 * This is a bit racy but we can avoid a lot of work
624	 * with this test...
625	 */
626	if (!local->monitors && !local->cooked_mntrs) {
627		dev_kfree_skb(skb);
628		return;
629	}
630
631	/* send frame to monitor interfaces now */
632
633	if (skb_headroom(skb) < sizeof(*rthdr)) {
634		printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
635		dev_kfree_skb(skb);
636		return;
637	}
638
639	rthdr = (struct ieee80211_tx_status_rtap_hdr *)
640				skb_push(skb, sizeof(*rthdr));
641
642	memset(rthdr, 0, sizeof(*rthdr));
643	rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
644	rthdr->hdr.it_present =
645		cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
646			    (1 << IEEE80211_RADIOTAP_DATA_RETRIES) |
647			    (1 << IEEE80211_RADIOTAP_RATE));
648
649	if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
650	    !is_multicast_ether_addr(hdr->addr1))
651		rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL);
652
653	/*
654	 * XXX: Once radiotap gets the bitmap reset thing the vendor
655	 *	extensions proposal contains, we can actually report
656	 *	the whole set of tries we did.
657	 */
658	if ((info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) ||
659	    (info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT))
660		rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS);
661	else if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS)
662		rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS);
663	if (info->status.rates[0].idx >= 0 &&
664	    !(info->status.rates[0].flags & IEEE80211_TX_RC_MCS))
665		rthdr->rate = sband->bitrates[
666				info->status.rates[0].idx].bitrate / 5;
667
668	/* for now report the total retry_count */
669	rthdr->data_retries = retry_count;
670
671	/* XXX: is this sufficient for BPF? */
672	skb_set_mac_header(skb, 0);
673	skb->ip_summed = CHECKSUM_UNNECESSARY;
674	skb->pkt_type = PACKET_OTHERHOST;
675	skb->protocol = htons(ETH_P_802_2);
676	memset(skb->cb, 0, sizeof(skb->cb));
677
678	rcu_read_lock();
679	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
680		if (sdata->vif.type == NL80211_IFTYPE_MONITOR) {
681			if (!netif_running(sdata->dev))
682				continue;
683
684			if (prev_dev) {
685				skb2 = skb_clone(skb, GFP_ATOMIC);
686				if (skb2) {
687					skb2->dev = prev_dev;
688					netif_rx(skb2);
689				}
690			}
691
692			prev_dev = sdata->dev;
693		}
694	}
695	if (prev_dev) {
696		skb->dev = prev_dev;
697		netif_rx(skb);
698		skb = NULL;
699	}
700	rcu_read_unlock();
701	dev_kfree_skb(skb);
702}
703EXPORT_SYMBOL(ieee80211_tx_status);
704
705struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
706					const struct ieee80211_ops *ops)
707{
708	struct ieee80211_local *local;
709	int priv_size, i;
710	struct wiphy *wiphy;
711
712	/* Ensure 32-byte alignment of our private data and hw private data.
713	 * We use the wiphy priv data for both our ieee80211_local and for
714	 * the driver's private data
715	 *
716	 * In memory it'll be like this:
717	 *
718	 * +-------------------------+
719	 * | struct wiphy	    |
720	 * +-------------------------+
721	 * | struct ieee80211_local  |
722	 * +-------------------------+
723	 * | driver's private data   |
724	 * +-------------------------+
725	 *
726	 */
727	priv_size = ((sizeof(struct ieee80211_local) +
728		      NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST) +
729		    priv_data_len;
730
731	wiphy = wiphy_new(&mac80211_config_ops, priv_size);
732
733	if (!wiphy)
734		return NULL;
735
736	wiphy->privid = mac80211_wiphy_privid;
737	wiphy->max_scan_ssids = 4;
738	/* Yes, putting cfg80211_bss into ieee80211_bss is a hack */
739	wiphy->bss_priv_size = sizeof(struct ieee80211_bss) -
740			       sizeof(struct cfg80211_bss);
741
742	local = wiphy_priv(wiphy);
743	local->hw.wiphy = wiphy;
744
745	local->hw.priv = (char *)local +
746			 ((sizeof(struct ieee80211_local) +
747			   NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);
748
749	BUG_ON(!ops->tx);
750	BUG_ON(!ops->start);
751	BUG_ON(!ops->stop);
752	BUG_ON(!ops->config);
753	BUG_ON(!ops->add_interface);
754	BUG_ON(!ops->remove_interface);
755	BUG_ON(!ops->configure_filter);
756	local->ops = ops;
757
758	/* set up some defaults */
759	local->hw.queues = 1;
760	local->hw.max_rates = 1;
761	local->rts_threshold = IEEE80211_MAX_RTS_THRESHOLD;
762	local->fragmentation_threshold = IEEE80211_MAX_FRAG_THRESHOLD;
763	local->hw.conf.long_frame_max_tx_count = 4;
764	local->hw.conf.short_frame_max_tx_count = 7;
765	local->hw.conf.radio_enabled = true;
766
767	INIT_LIST_HEAD(&local->interfaces);
768	mutex_init(&local->iflist_mtx);
769
770	spin_lock_init(&local->key_lock);
771
772	spin_lock_init(&local->queue_stop_reason_lock);
773
774	INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
775
776	INIT_WORK(&local->dynamic_ps_enable_work,
777		  ieee80211_dynamic_ps_enable_work);
778	INIT_WORK(&local->dynamic_ps_disable_work,
779		  ieee80211_dynamic_ps_disable_work);
780	setup_timer(&local->dynamic_ps_timer,
781		    ieee80211_dynamic_ps_timer, (unsigned long) local);
782
783	for (i = 0; i < IEEE80211_MAX_AMPDU_QUEUES; i++)
784		local->ampdu_ac_queue[i] = -1;
785	/* using an s8 won't work with more than that */
786	BUILD_BUG_ON(IEEE80211_MAX_AMPDU_QUEUES > 127);
787
788	sta_info_init(local);
789
790	tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
791		     (unsigned long)local);
792	tasklet_disable(&local->tx_pending_tasklet);
793
794	tasklet_init(&local->tasklet,
795		     ieee80211_tasklet_handler,
796		     (unsigned long) local);
797	tasklet_disable(&local->tasklet);
798
799	skb_queue_head_init(&local->skb_queue);
800	skb_queue_head_init(&local->skb_queue_unreliable);
801
802	return local_to_hw(local);
803}
804EXPORT_SYMBOL(ieee80211_alloc_hw);
805
806static const struct net_device_ops ieee80211_master_ops = {
807	.ndo_start_xmit = ieee80211_master_start_xmit,
808	.ndo_open = ieee80211_master_open,
809	.ndo_stop = ieee80211_master_stop,
810	.ndo_set_multicast_list = ieee80211_master_set_multicast_list,
811	.ndo_select_queue = ieee80211_select_queue,
812};
813
814static void ieee80211_master_setup(struct net_device *mdev)
815{
816	mdev->type = ARPHRD_IEEE80211;
817	mdev->netdev_ops = &ieee80211_master_ops;
818	mdev->header_ops = &ieee80211_header_ops;
819	mdev->tx_queue_len = 1000;
820	mdev->addr_len = ETH_ALEN;
821}
822
823int ieee80211_register_hw(struct ieee80211_hw *hw)
824{
825	struct ieee80211_local *local = hw_to_local(hw);
826	int result;
827	enum ieee80211_band band;
828	struct net_device *mdev;
829	struct ieee80211_master_priv *mpriv;
830	int channels, i, j;
831
832	/*
833	 * generic code guarantees at least one band,
834	 * set this very early because much code assumes
835	 * that hw.conf.channel is assigned
836	 */
837	channels = 0;
838	for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
839		struct ieee80211_supported_band *sband;
840
841		sband = local->hw.wiphy->bands[band];
842		if (sband && !local->oper_channel) {
843			/* init channel we're on */
844			local->hw.conf.channel =
845			local->oper_channel =
846			local->scan_channel = &sband->channels[0];
847		}
848		if (sband)
849			channels += sband->n_channels;
850	}
851
852	local->int_scan_req.n_channels = channels;
853	local->int_scan_req.channels = kzalloc(sizeof(void *) * channels, GFP_KERNEL);
854	if (!local->int_scan_req.channels)
855		return -ENOMEM;
856
857	/* if low-level driver supports AP, we also support VLAN */
858	if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP))
859		local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
860
861	/* mac80211 always supports monitor */
862	local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
863
864	result = wiphy_register(local->hw.wiphy);
865	if (result < 0)
866		goto fail_wiphy_register;
867
868	/*
869	 * We use the number of queues for feature tests (QoS, HT) internally
870	 * so restrict them appropriately.
871	 */
872	if (hw->queues > IEEE80211_MAX_QUEUES)
873		hw->queues = IEEE80211_MAX_QUEUES;
874	if (hw->ampdu_queues > IEEE80211_MAX_AMPDU_QUEUES)
875		hw->ampdu_queues = IEEE80211_MAX_AMPDU_QUEUES;
876	if (hw->queues < 4)
877		hw->ampdu_queues = 0;
878
879	mdev = alloc_netdev_mq(sizeof(struct ieee80211_master_priv),
880			       "wmaster%d", ieee80211_master_setup,
881			       hw->queues);
882	if (!mdev)
883		goto fail_mdev_alloc;
884
885	mpriv = netdev_priv(mdev);
886	mpriv->local = local;
887	local->mdev = mdev;
888
889	local->hw.workqueue =
890		create_singlethread_workqueue(wiphy_name(local->hw.wiphy));
891	if (!local->hw.workqueue) {
892		result = -ENOMEM;
893		goto fail_workqueue;
894	}
895
896	/*
897	 * The hardware needs headroom for sending the frame,
898	 * and we need some headroom for passing the frame to monitor
899	 * interfaces, but never both at the same time.
900	 */
901	local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
902				   sizeof(struct ieee80211_tx_status_rtap_hdr));
903
904	debugfs_hw_add(local);
905
906	if (local->hw.conf.beacon_int < 10)
907		local->hw.conf.beacon_int = 100;
908
909	if (local->hw.max_listen_interval == 0)
910		local->hw.max_listen_interval = 1;
911
912	local->hw.conf.listen_interval = local->hw.max_listen_interval;
913
914	result = sta_info_start(local);
915	if (result < 0)
916		goto fail_sta_info;
917
918	rtnl_lock();
919	result = dev_alloc_name(local->mdev, local->mdev->name);
920	if (result < 0)
921		goto fail_dev;
922
923	memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
924	SET_NETDEV_DEV(local->mdev, wiphy_dev(local->hw.wiphy));
925	local->mdev->features |= NETIF_F_NETNS_LOCAL;
926
927	result = register_netdevice(local->mdev);
928	if (result < 0)
929		goto fail_dev;
930
931	result = ieee80211_init_rate_ctrl_alg(local,
932					      hw->rate_control_algorithm);
933	if (result < 0) {
934		printk(KERN_DEBUG "%s: Failed to initialize rate control "
935		       "algorithm\n", wiphy_name(local->hw.wiphy));
936		goto fail_rate;
937	}
938
939	result = ieee80211_wep_init(local);
940
941	if (result < 0) {
942		printk(KERN_DEBUG "%s: Failed to initialize wep: %d\n",
943		       wiphy_name(local->hw.wiphy), result);
944		goto fail_wep;
945	}
946
947	/* add one default STA interface if supported */
948	if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
949		result = ieee80211_if_add(local, "wlan%d", NULL,
950					  NL80211_IFTYPE_STATION, NULL);
951		if (result)
952			printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
953			       wiphy_name(local->hw.wiphy));
954	}
955
956	rtnl_unlock();
957
958	ieee80211_led_init(local);
959
960	/* alloc internal scan request */
961	i = 0;
962	local->int_scan_req.ssids = &local->scan_ssid;
963	local->int_scan_req.n_ssids = 1;
964	for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
965		if (!hw->wiphy->bands[band])
966			continue;
967		for (j = 0; j < hw->wiphy->bands[band]->n_channels; j++) {
968			local->int_scan_req.channels[i] =
969				&hw->wiphy->bands[band]->channels[j];
970			i++;
971		}
972	}
973
974	return 0;
975
976fail_wep:
977	rate_control_deinitialize(local);
978fail_rate:
979	unregister_netdevice(local->mdev);
980	local->mdev = NULL;
981fail_dev:
982	rtnl_unlock();
983	sta_info_stop(local);
984fail_sta_info:
985	debugfs_hw_del(local);
986	destroy_workqueue(local->hw.workqueue);
987fail_workqueue:
988	if (local->mdev)
989		free_netdev(local->mdev);
990fail_mdev_alloc:
991	wiphy_unregister(local->hw.wiphy);
992fail_wiphy_register:
993	kfree(local->int_scan_req.channels);
994	return result;
995}
996EXPORT_SYMBOL(ieee80211_register_hw);
997
998void ieee80211_unregister_hw(struct ieee80211_hw *hw)
999{
1000	struct ieee80211_local *local = hw_to_local(hw);
1001
1002	tasklet_kill(&local->tx_pending_tasklet);
1003	tasklet_kill(&local->tasklet);
1004
1005	rtnl_lock();
1006
1007	/*
1008	 * At this point, interface list manipulations are fine
1009	 * because the driver cannot be handing us frames any
1010	 * more and the tasklet is killed.
1011	 */
1012
1013	/* First, we remove all virtual interfaces. */
1014	ieee80211_remove_interfaces(local);
1015
1016	/* then, finally, remove the master interface */
1017	unregister_netdevice(local->mdev);
1018
1019	rtnl_unlock();
1020
1021	ieee80211_clear_tx_pending(local);
1022	sta_info_stop(local);
1023	rate_control_deinitialize(local);
1024	debugfs_hw_del(local);
1025
1026	if (skb_queue_len(&local->skb_queue)
1027			|| skb_queue_len(&local->skb_queue_unreliable))
1028		printk(KERN_WARNING "%s: skb_queue not empty\n",
1029		       wiphy_name(local->hw.wiphy));
1030	skb_queue_purge(&local->skb_queue);
1031	skb_queue_purge(&local->skb_queue_unreliable);
1032
1033	destroy_workqueue(local->hw.workqueue);
1034	wiphy_unregister(local->hw.wiphy);
1035	ieee80211_wep_free(local);
1036	ieee80211_led_exit(local);
1037	free_netdev(local->mdev);
1038	kfree(local->int_scan_req.channels);
1039}
1040EXPORT_SYMBOL(ieee80211_unregister_hw);
1041
1042void ieee80211_free_hw(struct ieee80211_hw *hw)
1043{
1044	struct ieee80211_local *local = hw_to_local(hw);
1045
1046	mutex_destroy(&local->iflist_mtx);
1047
1048	wiphy_free(local->hw.wiphy);
1049}
1050EXPORT_SYMBOL(ieee80211_free_hw);
1051
1052static int __init ieee80211_init(void)
1053{
1054	struct sk_buff *skb;
1055	int ret;
1056
1057	BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1058	BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1059		     IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1060
1061	ret = rc80211_minstrel_init();
1062	if (ret)
1063		return ret;
1064
1065	ret = rc80211_pid_init();
1066	if (ret)
1067		return ret;
1068
1069	ieee80211_debugfs_netdev_init();
1070
1071	return 0;
1072}
1073
1074static void __exit ieee80211_exit(void)
1075{
1076	rc80211_pid_exit();
1077	rc80211_minstrel_exit();
1078
1079	/*
1080	 * For key todo, it'll be empty by now but the work
1081	 * might still be scheduled.
1082	 */
1083	flush_scheduled_work();
1084
1085	if (mesh_allocated)
1086		ieee80211s_stop();
1087
1088	ieee80211_debugfs_netdev_exit();
1089}
1090
1091
1092subsys_initcall(ieee80211_init);
1093module_exit(ieee80211_exit);
1094
1095MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1096MODULE_LICENSE("GPL");
1097