main.c revision b9a5f8cab751d362f7c2d94899ca788c22fcd1ef 
1/*
2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007	Jiri Benc <jbenc@suse.cz>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 */
10
11#include <net/mac80211.h>
12#include <net/ieee80211_radiotap.h>
13#include <linux/module.h>
14#include <linux/init.h>
15#include <linux/netdevice.h>
16#include <linux/types.h>
17#include <linux/slab.h>
18#include <linux/skbuff.h>
19#include <linux/etherdevice.h>
20#include <linux/if_arp.h>
21#include <linux/wireless.h>
22#include <linux/rtnetlink.h>
23#include <linux/bitmap.h>
24#include <linux/pm_qos_params.h>
25#include <net/net_namespace.h>
26#include <net/cfg80211.h>
27
28#include "ieee80211_i.h"
29#include "rate.h"
30#include "mesh.h"
31#include "wep.h"
32#include "wme.h"
33#include "aes_ccm.h"
34#include "led.h"
35#include "cfg.h"
36#include "debugfs.h"
37#include "debugfs_netdev.h"
38
39/*
40 * For seeing transmitted packets on monitor interfaces
41 * we have a radiotap header too.
42 */
43struct ieee80211_tx_status_rtap_hdr {
44	struct ieee80211_radiotap_header hdr;
45	u8 rate;
46	u8 padding_for_rate;
47	__le16 tx_flags;
48	u8 data_retries;
49} __attribute__ ((packed));
50
51
52/* must be called under mdev tx lock */
53void ieee80211_configure_filter(struct ieee80211_local *local)
54{
55	unsigned int changed_flags;
56	unsigned int new_flags = 0;
57
58	if (atomic_read(&local->iff_promiscs))
59		new_flags |= FIF_PROMISC_IN_BSS;
60
61	if (atomic_read(&local->iff_allmultis))
62		new_flags |= FIF_ALLMULTI;
63
64	if (local->monitors)
65		new_flags |= FIF_BCN_PRBRESP_PROMISC;
66
67	if (local->fif_fcsfail)
68		new_flags |= FIF_FCSFAIL;
69
70	if (local->fif_plcpfail)
71		new_flags |= FIF_PLCPFAIL;
72
73	if (local->fif_control)
74		new_flags |= FIF_CONTROL;
75
76	if (local->fif_other_bss)
77		new_flags |= FIF_OTHER_BSS;
78
79	changed_flags = local->filter_flags ^ new_flags;
80
81	/* be a bit nasty */
82	new_flags |= (1<<31);
83
84	local->ops->configure_filter(local_to_hw(local),
85				     changed_flags, &new_flags,
86				     local->mdev->mc_count,
87				     local->mdev->mc_list);
88
89	WARN_ON(new_flags & (1<<31));
90
91	local->filter_flags = new_flags & ~(1<<31);
92}
93
94/* master interface */
95
96static int header_parse_80211(const struct sk_buff *skb, unsigned char *haddr)
97{
98	memcpy(haddr, skb_mac_header(skb) + 10, ETH_ALEN); /* addr2 */
99	return ETH_ALEN;
100}
101
102static const struct header_ops ieee80211_header_ops = {
103	.create		= eth_header,
104	.parse		= header_parse_80211,
105	.rebuild	= eth_rebuild_header,
106	.cache		= eth_header_cache,
107	.cache_update	= eth_header_cache_update,
108};
109
110static int ieee80211_master_open(struct net_device *dev)
111{
112	struct ieee80211_master_priv *mpriv = netdev_priv(dev);
113	struct ieee80211_local *local = mpriv->local;
114	struct ieee80211_sub_if_data *sdata;
115	int res = -EOPNOTSUPP;
116
117	/* we hold the RTNL here so can safely walk the list */
118	list_for_each_entry(sdata, &local->interfaces, list) {
119		if (netif_running(sdata->dev)) {
120			res = 0;
121			break;
122		}
123	}
124
125	if (res)
126		return res;
127
128	netif_tx_start_all_queues(local->mdev);
129
130	return 0;
131}
132
133static int ieee80211_master_stop(struct net_device *dev)
134{
135	struct ieee80211_master_priv *mpriv = netdev_priv(dev);
136	struct ieee80211_local *local = mpriv->local;
137	struct ieee80211_sub_if_data *sdata;
138
139	/* we hold the RTNL here so can safely walk the list */
140	list_for_each_entry(sdata, &local->interfaces, list)
141		if (netif_running(sdata->dev))
142			dev_close(sdata->dev);
143
144	return 0;
145}
146
147static void ieee80211_master_set_multicast_list(struct net_device *dev)
148{
149	struct ieee80211_master_priv *mpriv = netdev_priv(dev);
150	struct ieee80211_local *local = mpriv->local;
151
152	ieee80211_configure_filter(local);
153}
154
155/* everything else */
156
157int ieee80211_if_config(struct ieee80211_sub_if_data *sdata, u32 changed)
158{
159	struct ieee80211_local *local = sdata->local;
160	struct ieee80211_if_conf conf;
161
162	if (WARN_ON(!netif_running(sdata->dev)))
163		return 0;
164
165	memset(&conf, 0, sizeof(conf));
166
167	if (sdata->vif.type == NL80211_IFTYPE_STATION)
168		conf.bssid = sdata->u.mgd.bssid;
169	else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
170		conf.bssid = sdata->u.ibss.bssid;
171	else if (sdata->vif.type == NL80211_IFTYPE_AP)
172		conf.bssid = sdata->dev->dev_addr;
173	else if (ieee80211_vif_is_mesh(&sdata->vif)) {
174		static const u8 zero[ETH_ALEN] = { 0 };
175		conf.bssid = zero;
176	} else {
177		WARN_ON(1);
178		return -EINVAL;
179	}
180
181	if (!local->ops->config_interface)
182		return 0;
183
184	switch (sdata->vif.type) {
185	case NL80211_IFTYPE_AP:
186	case NL80211_IFTYPE_ADHOC:
187	case NL80211_IFTYPE_MESH_POINT:
188		break;
189	default:
190		/* do not warn to simplify caller in scan.c */
191		changed &= ~IEEE80211_IFCC_BEACON_ENABLED;
192		if (WARN_ON(changed & IEEE80211_IFCC_BEACON))
193			return -EINVAL;
194		changed &= ~IEEE80211_IFCC_BEACON;
195		break;
196	}
197
198	if (changed & IEEE80211_IFCC_BEACON_ENABLED) {
199		if (local->sw_scanning) {
200			conf.enable_beacon = false;
201		} else {
202			/*
203			 * Beacon should be enabled, but AP mode must
204			 * check whether there is a beacon configured.
205			 */
206			switch (sdata->vif.type) {
207			case NL80211_IFTYPE_AP:
208				conf.enable_beacon =
209					!!rcu_dereference(sdata->u.ap.beacon);
210				break;
211			case NL80211_IFTYPE_ADHOC:
212				conf.enable_beacon = !!sdata->u.ibss.presp;
213				break;
214			case NL80211_IFTYPE_MESH_POINT:
215				conf.enable_beacon = true;
216				break;
217			default:
218				/* not reached */
219				WARN_ON(1);
220				break;
221			}
222		}
223	}
224
225	conf.changed = changed;
226
227	return local->ops->config_interface(local_to_hw(local),
228					    &sdata->vif, &conf);
229}
230
231int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
232{
233	struct ieee80211_channel *chan;
234	int ret = 0;
235	int power;
236	enum nl80211_channel_type channel_type;
237
238	might_sleep();
239
240	if (local->sw_scanning) {
241		chan = local->scan_channel;
242		channel_type = NL80211_CHAN_NO_HT;
243	} else {
244		chan = local->oper_channel;
245		channel_type = local->oper_channel_type;
246	}
247
248	if (chan != local->hw.conf.channel ||
249	    channel_type != local->hw.conf.channel_type) {
250		local->hw.conf.channel = chan;
251		local->hw.conf.channel_type = channel_type;
252		changed |= IEEE80211_CONF_CHANGE_CHANNEL;
253	}
254
255	if (local->sw_scanning)
256		power = chan->max_power;
257	else
258		power = local->power_constr_level ?
259			(chan->max_power - local->power_constr_level) :
260			chan->max_power;
261
262	if (local->user_power_level >= 0)
263		power = min(power, local->user_power_level);
264
265	if (local->hw.conf.power_level != power) {
266		changed |= IEEE80211_CONF_CHANGE_POWER;
267		local->hw.conf.power_level = power;
268	}
269
270	if (changed && local->open_count) {
271		ret = local->ops->config(local_to_hw(local), changed);
272		/*
273		 * Goal:
274		 * HW reconfiguration should never fail, the driver has told
275		 * us what it can support so it should live up to that promise.
276		 *
277		 * Current status:
278		 * rfkill is not integrated with mac80211 and a
279		 * configuration command can thus fail if hardware rfkill
280		 * is enabled
281		 *
282		 * FIXME: integrate rfkill with mac80211 and then add this
283		 * WARN_ON() back
284		 *
285		 */
286		/* WARN_ON(ret); */
287	}
288
289	return ret;
290}
291
292void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
293				      u32 changed)
294{
295	struct ieee80211_local *local = sdata->local;
296
297	if (WARN_ON(sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
298		return;
299
300	if (!changed)
301		return;
302
303	if (local->ops->bss_info_changed)
304		local->ops->bss_info_changed(local_to_hw(local),
305					     &sdata->vif,
306					     &sdata->vif.bss_conf,
307					     changed);
308}
309
310u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
311{
312	sdata->vif.bss_conf.use_cts_prot = false;
313	sdata->vif.bss_conf.use_short_preamble = false;
314	sdata->vif.bss_conf.use_short_slot = false;
315	return BSS_CHANGED_ERP_CTS_PROT |
316	       BSS_CHANGED_ERP_PREAMBLE |
317	       BSS_CHANGED_ERP_SLOT;
318}
319
320void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
321				 struct sk_buff *skb)
322{
323	struct ieee80211_local *local = hw_to_local(hw);
324	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
325	int tmp;
326
327	skb->dev = local->mdev;
328	skb->pkt_type = IEEE80211_TX_STATUS_MSG;
329	skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ?
330		       &local->skb_queue : &local->skb_queue_unreliable, skb);
331	tmp = skb_queue_len(&local->skb_queue) +
332		skb_queue_len(&local->skb_queue_unreliable);
333	while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
334	       (skb = skb_dequeue(&local->skb_queue_unreliable))) {
335		dev_kfree_skb_irq(skb);
336		tmp--;
337		I802_DEBUG_INC(local->tx_status_drop);
338	}
339	tasklet_schedule(&local->tasklet);
340}
341EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
342
343static void ieee80211_tasklet_handler(unsigned long data)
344{
345	struct ieee80211_local *local = (struct ieee80211_local *) data;
346	struct sk_buff *skb;
347	struct ieee80211_rx_status rx_status;
348	struct ieee80211_ra_tid *ra_tid;
349
350	while ((skb = skb_dequeue(&local->skb_queue)) ||
351	       (skb = skb_dequeue(&local->skb_queue_unreliable))) {
352		switch (skb->pkt_type) {
353		case IEEE80211_RX_MSG:
354			/* status is in skb->cb */
355			memcpy(&rx_status, skb->cb, sizeof(rx_status));
356			/* Clear skb->pkt_type in order to not confuse kernel
357			 * netstack. */
358			skb->pkt_type = 0;
359			__ieee80211_rx(local_to_hw(local), skb, &rx_status);
360			break;
361		case IEEE80211_TX_STATUS_MSG:
362			skb->pkt_type = 0;
363			ieee80211_tx_status(local_to_hw(local), skb);
364			break;
365		case IEEE80211_DELBA_MSG:
366			ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
367			ieee80211_stop_tx_ba_cb(local_to_hw(local),
368						ra_tid->ra, ra_tid->tid);
369			dev_kfree_skb(skb);
370			break;
371		case IEEE80211_ADDBA_MSG:
372			ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
373			ieee80211_start_tx_ba_cb(local_to_hw(local),
374						 ra_tid->ra, ra_tid->tid);
375			dev_kfree_skb(skb);
376			break ;
377		default:
378			WARN(1, "mac80211: Packet is of unknown type %d\n",
379			     skb->pkt_type);
380			dev_kfree_skb(skb);
381			break;
382		}
383	}
384}
385
386/* Remove added headers (e.g., QoS control), encryption header/MIC, etc. to
387 * make a prepared TX frame (one that has been given to hw) to look like brand
388 * new IEEE 802.11 frame that is ready to go through TX processing again.
389 */
390static void ieee80211_remove_tx_extra(struct ieee80211_local *local,
391				      struct ieee80211_key *key,
392				      struct sk_buff *skb)
393{
394	unsigned int hdrlen, iv_len, mic_len;
395	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
396
397	hdrlen = ieee80211_hdrlen(hdr->frame_control);
398
399	if (!key)
400		goto no_key;
401
402	switch (key->conf.alg) {
403	case ALG_WEP:
404		iv_len = WEP_IV_LEN;
405		mic_len = WEP_ICV_LEN;
406		break;
407	case ALG_TKIP:
408		iv_len = TKIP_IV_LEN;
409		mic_len = TKIP_ICV_LEN;
410		break;
411	case ALG_CCMP:
412		iv_len = CCMP_HDR_LEN;
413		mic_len = CCMP_MIC_LEN;
414		break;
415	default:
416		goto no_key;
417	}
418
419	if (skb->len >= hdrlen + mic_len &&
420	    !(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
421		skb_trim(skb, skb->len - mic_len);
422	if (skb->len >= hdrlen + iv_len) {
423		memmove(skb->data + iv_len, skb->data, hdrlen);
424		hdr = (struct ieee80211_hdr *)skb_pull(skb, iv_len);
425	}
426
427no_key:
428	if (ieee80211_is_data_qos(hdr->frame_control)) {
429		hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
430		memmove(skb->data + IEEE80211_QOS_CTL_LEN, skb->data,
431			hdrlen - IEEE80211_QOS_CTL_LEN);
432		skb_pull(skb, IEEE80211_QOS_CTL_LEN);
433	}
434}
435
436static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
437					    struct sta_info *sta,
438					    struct sk_buff *skb)
439{
440	sta->tx_filtered_count++;
441
442	/*
443	 * Clear the TX filter mask for this STA when sending the next
444	 * packet. If the STA went to power save mode, this will happen
445	 * when it wakes up for the next time.
446	 */
447	set_sta_flags(sta, WLAN_STA_CLEAR_PS_FILT);
448
449	/*
450	 * This code races in the following way:
451	 *
452	 *  (1) STA sends frame indicating it will go to sleep and does so
453	 *  (2) hardware/firmware adds STA to filter list, passes frame up
454	 *  (3) hardware/firmware processes TX fifo and suppresses a frame
455	 *  (4) we get TX status before having processed the frame and
456	 *	knowing that the STA has gone to sleep.
457	 *
458	 * This is actually quite unlikely even when both those events are
459	 * processed from interrupts coming in quickly after one another or
460	 * even at the same time because we queue both TX status events and
461	 * RX frames to be processed by a tasklet and process them in the
462	 * same order that they were received or TX status last. Hence, there
463	 * is no race as long as the frame RX is processed before the next TX
464	 * status, which drivers can ensure, see below.
465	 *
466	 * Note that this can only happen if the hardware or firmware can
467	 * actually add STAs to the filter list, if this is done by the
468	 * driver in response to set_tim() (which will only reduce the race
469	 * this whole filtering tries to solve, not completely solve it)
470	 * this situation cannot happen.
471	 *
472	 * To completely solve this race drivers need to make sure that they
473	 *  (a) don't mix the irq-safe/not irq-safe TX status/RX processing
474	 *	functions and
475	 *  (b) always process RX events before TX status events if ordering
476	 *      can be unknown, for example with different interrupt status
477	 *	bits.
478	 */
479	if (test_sta_flags(sta, WLAN_STA_PS) &&
480	    skb_queue_len(&sta->tx_filtered) < STA_MAX_TX_BUFFER) {
481		ieee80211_remove_tx_extra(local, sta->key, skb);
482		skb_queue_tail(&sta->tx_filtered, skb);
483		return;
484	}
485
486	if (!test_sta_flags(sta, WLAN_STA_PS) && !skb->requeue) {
487		/* Software retry the packet once */
488		skb->requeue = 1;
489		ieee80211_remove_tx_extra(local, sta->key, skb);
490		dev_queue_xmit(skb);
491		return;
492	}
493
494#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
495	if (net_ratelimit())
496		printk(KERN_DEBUG "%s: dropped TX filtered frame, "
497		       "queue_len=%d PS=%d @%lu\n",
498		       wiphy_name(local->hw.wiphy),
499		       skb_queue_len(&sta->tx_filtered),
500		       !!test_sta_flags(sta, WLAN_STA_PS), jiffies);
501#endif
502	dev_kfree_skb(skb);
503}
504
505void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
506{
507	struct sk_buff *skb2;
508	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
509	struct ieee80211_local *local = hw_to_local(hw);
510	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
511	u16 frag, type;
512	__le16 fc;
513	struct ieee80211_supported_band *sband;
514	struct ieee80211_tx_status_rtap_hdr *rthdr;
515	struct ieee80211_sub_if_data *sdata;
516	struct net_device *prev_dev = NULL;
517	struct sta_info *sta;
518	int retry_count = -1, i;
519
520	for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
521		/* the HW cannot have attempted that rate */
522		if (i >= hw->max_rates) {
523			info->status.rates[i].idx = -1;
524			info->status.rates[i].count = 0;
525		}
526
527		retry_count += info->status.rates[i].count;
528	}
529	if (retry_count < 0)
530		retry_count = 0;
531
532	rcu_read_lock();
533
534	sband = local->hw.wiphy->bands[info->band];
535
536	sta = sta_info_get(local, hdr->addr1);
537
538	if (sta) {
539		if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
540		    test_sta_flags(sta, WLAN_STA_PS)) {
541			/*
542			 * The STA is in power save mode, so assume
543			 * that this TX packet failed because of that.
544			 */
545			ieee80211_handle_filtered_frame(local, sta, skb);
546			rcu_read_unlock();
547			return;
548		}
549
550		fc = hdr->frame_control;
551
552		if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
553		    (ieee80211_is_data_qos(fc))) {
554			u16 tid, ssn;
555			u8 *qc;
556
557			qc = ieee80211_get_qos_ctl(hdr);
558			tid = qc[0] & 0xf;
559			ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
560						& IEEE80211_SCTL_SEQ);
561			ieee80211_send_bar(sta->sdata, hdr->addr1,
562					   tid, ssn);
563		}
564
565		if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
566			ieee80211_handle_filtered_frame(local, sta, skb);
567			rcu_read_unlock();
568			return;
569		} else {
570			if (!(info->flags & IEEE80211_TX_STAT_ACK))
571				sta->tx_retry_failed++;
572			sta->tx_retry_count += retry_count;
573		}
574
575		rate_control_tx_status(local, sband, sta, skb);
576	}
577
578	rcu_read_unlock();
579
580	ieee80211_led_tx(local, 0);
581
582	/* SNMP counters
583	 * Fragments are passed to low-level drivers as separate skbs, so these
584	 * are actually fragments, not frames. Update frame counters only for
585	 * the first fragment of the frame. */
586
587	frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG;
588	type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE;
589
590	if (info->flags & IEEE80211_TX_STAT_ACK) {
591		if (frag == 0) {
592			local->dot11TransmittedFrameCount++;
593			if (is_multicast_ether_addr(hdr->addr1))
594				local->dot11MulticastTransmittedFrameCount++;
595			if (retry_count > 0)
596				local->dot11RetryCount++;
597			if (retry_count > 1)
598				local->dot11MultipleRetryCount++;
599		}
600
601		/* This counter shall be incremented for an acknowledged MPDU
602		 * with an individual address in the address 1 field or an MPDU
603		 * with a multicast address in the address 1 field of type Data
604		 * or Management. */
605		if (!is_multicast_ether_addr(hdr->addr1) ||
606		    type == IEEE80211_FTYPE_DATA ||
607		    type == IEEE80211_FTYPE_MGMT)
608			local->dot11TransmittedFragmentCount++;
609	} else {
610		if (frag == 0)
611			local->dot11FailedCount++;
612	}
613
614	/* this was a transmitted frame, but now we want to reuse it */
615	skb_orphan(skb);
616
617	/*
618	 * This is a bit racy but we can avoid a lot of work
619	 * with this test...
620	 */
621	if (!local->monitors && !local->cooked_mntrs) {
622		dev_kfree_skb(skb);
623		return;
624	}
625
626	/* send frame to monitor interfaces now */
627
628	if (skb_headroom(skb) < sizeof(*rthdr)) {
629		printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
630		dev_kfree_skb(skb);
631		return;
632	}
633
634	rthdr = (struct ieee80211_tx_status_rtap_hdr *)
635				skb_push(skb, sizeof(*rthdr));
636
637	memset(rthdr, 0, sizeof(*rthdr));
638	rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
639	rthdr->hdr.it_present =
640		cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
641			    (1 << IEEE80211_RADIOTAP_DATA_RETRIES) |
642			    (1 << IEEE80211_RADIOTAP_RATE));
643
644	if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
645	    !is_multicast_ether_addr(hdr->addr1))
646		rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL);
647
648	/*
649	 * XXX: Once radiotap gets the bitmap reset thing the vendor
650	 *	extensions proposal contains, we can actually report
651	 *	the whole set of tries we did.
652	 */
653	if ((info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) ||
654	    (info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT))
655		rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS);
656	else if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS)
657		rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS);
658	if (info->status.rates[0].idx >= 0 &&
659	    !(info->status.rates[0].flags & IEEE80211_TX_RC_MCS))
660		rthdr->rate = sband->bitrates[
661				info->status.rates[0].idx].bitrate / 5;
662
663	/* for now report the total retry_count */
664	rthdr->data_retries = retry_count;
665
666	/* XXX: is this sufficient for BPF? */
667	skb_set_mac_header(skb, 0);
668	skb->ip_summed = CHECKSUM_UNNECESSARY;
669	skb->pkt_type = PACKET_OTHERHOST;
670	skb->protocol = htons(ETH_P_802_2);
671	memset(skb->cb, 0, sizeof(skb->cb));
672
673	rcu_read_lock();
674	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
675		if (sdata->vif.type == NL80211_IFTYPE_MONITOR) {
676			if (!netif_running(sdata->dev))
677				continue;
678
679			if (prev_dev) {
680				skb2 = skb_clone(skb, GFP_ATOMIC);
681				if (skb2) {
682					skb2->dev = prev_dev;
683					netif_rx(skb2);
684				}
685			}
686
687			prev_dev = sdata->dev;
688		}
689	}
690	if (prev_dev) {
691		skb->dev = prev_dev;
692		netif_rx(skb);
693		skb = NULL;
694	}
695	rcu_read_unlock();
696	dev_kfree_skb(skb);
697}
698EXPORT_SYMBOL(ieee80211_tx_status);
699
700static void ieee80211_restart_work(struct work_struct *work)
701{
702	struct ieee80211_local *local =
703		container_of(work, struct ieee80211_local, restart_work);
704
705	rtnl_lock();
706	ieee80211_reconfig(local);
707	rtnl_unlock();
708}
709
710void ieee80211_restart_hw(struct ieee80211_hw *hw)
711{
712	struct ieee80211_local *local = hw_to_local(hw);
713
714	/* use this reason, __ieee80211_resume will unblock it */
715	ieee80211_stop_queues_by_reason(hw,
716		IEEE80211_QUEUE_STOP_REASON_SUSPEND);
717
718	schedule_work(&local->restart_work);
719}
720EXPORT_SYMBOL(ieee80211_restart_hw);
721
722struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
723					const struct ieee80211_ops *ops)
724{
725	struct ieee80211_local *local;
726	int priv_size, i;
727	struct wiphy *wiphy;
728
729	/* Ensure 32-byte alignment of our private data and hw private data.
730	 * We use the wiphy priv data for both our ieee80211_local and for
731	 * the driver's private data
732	 *
733	 * In memory it'll be like this:
734	 *
735	 * +-------------------------+
736	 * | struct wiphy	    |
737	 * +-------------------------+
738	 * | struct ieee80211_local  |
739	 * +-------------------------+
740	 * | driver's private data   |
741	 * +-------------------------+
742	 *
743	 */
744	priv_size = ((sizeof(struct ieee80211_local) +
745		      NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST) +
746		    priv_data_len;
747
748	wiphy = wiphy_new(&mac80211_config_ops, priv_size);
749
750	if (!wiphy)
751		return NULL;
752
753	wiphy->privid = mac80211_wiphy_privid;
754
755	/* Yes, putting cfg80211_bss into ieee80211_bss is a hack */
756	wiphy->bss_priv_size = sizeof(struct ieee80211_bss) -
757			       sizeof(struct cfg80211_bss);
758
759	local = wiphy_priv(wiphy);
760
761	local->hw.wiphy = wiphy;
762
763	local->hw.priv = (char *)local +
764			 ((sizeof(struct ieee80211_local) +
765			   NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);
766
767	BUG_ON(!ops->tx);
768	BUG_ON(!ops->start);
769	BUG_ON(!ops->stop);
770	BUG_ON(!ops->config);
771	BUG_ON(!ops->add_interface);
772	BUG_ON(!ops->remove_interface);
773	BUG_ON(!ops->configure_filter);
774	local->ops = ops;
775
776	/* set up some defaults */
777	local->hw.queues = 1;
778	local->hw.max_rates = 1;
779	local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
780	local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
781	local->hw.conf.radio_enabled = true;
782
783	INIT_LIST_HEAD(&local->interfaces);
784	mutex_init(&local->iflist_mtx);
785
786	spin_lock_init(&local->key_lock);
787
788	spin_lock_init(&local->queue_stop_reason_lock);
789
790	INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
791
792	INIT_WORK(&local->restart_work, ieee80211_restart_work);
793
794	INIT_WORK(&local->dynamic_ps_enable_work,
795		  ieee80211_dynamic_ps_enable_work);
796	INIT_WORK(&local->dynamic_ps_disable_work,
797		  ieee80211_dynamic_ps_disable_work);
798	setup_timer(&local->dynamic_ps_timer,
799		    ieee80211_dynamic_ps_timer, (unsigned long) local);
800
801	sta_info_init(local);
802
803	for (i = 0; i < IEEE80211_MAX_QUEUES; i++)
804		skb_queue_head_init(&local->pending[i]);
805	tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
806		     (unsigned long)local);
807	tasklet_disable(&local->tx_pending_tasklet);
808
809	tasklet_init(&local->tasklet,
810		     ieee80211_tasklet_handler,
811		     (unsigned long) local);
812	tasklet_disable(&local->tasklet);
813
814	skb_queue_head_init(&local->skb_queue);
815	skb_queue_head_init(&local->skb_queue_unreliable);
816
817	spin_lock_init(&local->ampdu_lock);
818
819	return local_to_hw(local);
820}
821EXPORT_SYMBOL(ieee80211_alloc_hw);
822
823static const struct net_device_ops ieee80211_master_ops = {
824	.ndo_start_xmit = ieee80211_master_start_xmit,
825	.ndo_open = ieee80211_master_open,
826	.ndo_stop = ieee80211_master_stop,
827	.ndo_set_multicast_list = ieee80211_master_set_multicast_list,
828	.ndo_select_queue = ieee80211_select_queue,
829};
830
831static void ieee80211_master_setup(struct net_device *mdev)
832{
833	mdev->type = ARPHRD_IEEE80211;
834	mdev->netdev_ops = &ieee80211_master_ops;
835	mdev->header_ops = &ieee80211_header_ops;
836	mdev->tx_queue_len = 1000;
837	mdev->addr_len = ETH_ALEN;
838}
839
840int ieee80211_register_hw(struct ieee80211_hw *hw)
841{
842	struct ieee80211_local *local = hw_to_local(hw);
843	int result;
844	enum ieee80211_band band;
845	struct net_device *mdev;
846	struct ieee80211_master_priv *mpriv;
847	int channels, i, j, max_bitrates;
848	bool supp_ht;
849	static const u32 cipher_suites[] = {
850		WLAN_CIPHER_SUITE_WEP40,
851		WLAN_CIPHER_SUITE_WEP104,
852		WLAN_CIPHER_SUITE_TKIP,
853		WLAN_CIPHER_SUITE_CCMP,
854
855		/* keep last -- depends on hw flags! */
856		WLAN_CIPHER_SUITE_AES_CMAC
857	};
858
859	/*
860	 * generic code guarantees at least one band,
861	 * set this very early because much code assumes
862	 * that hw.conf.channel is assigned
863	 */
864	channels = 0;
865	max_bitrates = 0;
866	supp_ht = false;
867	for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
868		struct ieee80211_supported_band *sband;
869
870		sband = local->hw.wiphy->bands[band];
871		if (!sband)
872			continue;
873		if (!local->oper_channel) {
874			/* init channel we're on */
875			local->hw.conf.channel =
876			local->oper_channel =
877			local->scan_channel = &sband->channels[0];
878		}
879		channels += sband->n_channels;
880
881		if (max_bitrates < sband->n_bitrates)
882			max_bitrates = sband->n_bitrates;
883		supp_ht = supp_ht || sband->ht_cap.ht_supported;
884	}
885
886	local->int_scan_req.n_channels = channels;
887	local->int_scan_req.channels = kzalloc(sizeof(void *) * channels, GFP_KERNEL);
888	if (!local->int_scan_req.channels)
889		return -ENOMEM;
890
891	/* if low-level driver supports AP, we also support VLAN */
892	if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP))
893		local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
894
895	/* mac80211 always supports monitor */
896	local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
897
898	if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
899		local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
900	else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
901		local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
902
903	/*
904	 * Calculate scan IE length -- we need this to alloc
905	 * memory and to subtract from the driver limit. It
906	 * includes the (extended) supported rates and HT
907	 * information -- SSID is the driver's responsibility.
908	 */
909	local->scan_ies_len = 4 + max_bitrates; /* (ext) supp rates */
910	if (supp_ht)
911		local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
912
913	if (!local->ops->hw_scan) {
914		/* For hw_scan, driver needs to set these up. */
915		local->hw.wiphy->max_scan_ssids = 4;
916		local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
917	}
918
919	/*
920	 * If the driver supports any scan IEs, then assume the
921	 * limit includes the IEs mac80211 will add, otherwise
922	 * leave it at zero and let the driver sort it out; we
923	 * still pass our IEs to the driver but userspace will
924	 * not be allowed to in that case.
925	 */
926	if (local->hw.wiphy->max_scan_ie_len)
927		local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
928
929	local->hw.wiphy->cipher_suites = cipher_suites;
930	local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
931	if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
932		local->hw.wiphy->n_cipher_suites--;
933
934	result = wiphy_register(local->hw.wiphy);
935	if (result < 0)
936		goto fail_wiphy_register;
937
938	/*
939	 * We use the number of queues for feature tests (QoS, HT) internally
940	 * so restrict them appropriately.
941	 */
942	if (hw->queues > IEEE80211_MAX_QUEUES)
943		hw->queues = IEEE80211_MAX_QUEUES;
944
945	mdev = alloc_netdev_mq(sizeof(struct ieee80211_master_priv),
946			       "wmaster%d", ieee80211_master_setup,
947			       hw->queues);
948	if (!mdev)
949		goto fail_mdev_alloc;
950
951	mpriv = netdev_priv(mdev);
952	mpriv->local = local;
953	local->mdev = mdev;
954
955	local->hw.workqueue =
956		create_singlethread_workqueue(wiphy_name(local->hw.wiphy));
957	if (!local->hw.workqueue) {
958		result = -ENOMEM;
959		goto fail_workqueue;
960	}
961
962	/*
963	 * The hardware needs headroom for sending the frame,
964	 * and we need some headroom for passing the frame to monitor
965	 * interfaces, but never both at the same time.
966	 */
967	local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
968				   sizeof(struct ieee80211_tx_status_rtap_hdr));
969
970	debugfs_hw_add(local);
971
972	if (local->hw.conf.beacon_int < 10)
973		local->hw.conf.beacon_int = 100;
974
975	if (local->hw.max_listen_interval == 0)
976		local->hw.max_listen_interval = 1;
977
978	local->hw.conf.listen_interval = local->hw.max_listen_interval;
979
980	result = sta_info_start(local);
981	if (result < 0)
982		goto fail_sta_info;
983
984	rtnl_lock();
985	result = dev_alloc_name(local->mdev, local->mdev->name);
986	if (result < 0)
987		goto fail_dev;
988
989	memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
990	SET_NETDEV_DEV(local->mdev, wiphy_dev(local->hw.wiphy));
991	local->mdev->features |= NETIF_F_NETNS_LOCAL;
992
993	result = register_netdevice(local->mdev);
994	if (result < 0)
995		goto fail_dev;
996
997	result = ieee80211_init_rate_ctrl_alg(local,
998					      hw->rate_control_algorithm);
999	if (result < 0) {
1000		printk(KERN_DEBUG "%s: Failed to initialize rate control "
1001		       "algorithm\n", wiphy_name(local->hw.wiphy));
1002		goto fail_rate;
1003	}
1004
1005	result = ieee80211_wep_init(local);
1006
1007	if (result < 0) {
1008		printk(KERN_DEBUG "%s: Failed to initialize wep: %d\n",
1009		       wiphy_name(local->hw.wiphy), result);
1010		goto fail_wep;
1011	}
1012
1013	/* add one default STA interface if supported */
1014	if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
1015		result = ieee80211_if_add(local, "wlan%d", NULL,
1016					  NL80211_IFTYPE_STATION, NULL);
1017		if (result)
1018			printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
1019			       wiphy_name(local->hw.wiphy));
1020	}
1021
1022	rtnl_unlock();
1023
1024	ieee80211_led_init(local);
1025
1026	/* alloc internal scan request */
1027	i = 0;
1028	local->int_scan_req.ssids = &local->scan_ssid;
1029	local->int_scan_req.n_ssids = 1;
1030	for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1031		if (!hw->wiphy->bands[band])
1032			continue;
1033		for (j = 0; j < hw->wiphy->bands[band]->n_channels; j++) {
1034			local->int_scan_req.channels[i] =
1035				&hw->wiphy->bands[band]->channels[j];
1036			i++;
1037		}
1038	}
1039
1040	local->network_latency_notifier.notifier_call =
1041		ieee80211_max_network_latency;
1042	result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
1043				     &local->network_latency_notifier);
1044
1045	if (result) {
1046		rtnl_lock();
1047		goto fail_pm_qos;
1048	}
1049
1050	return 0;
1051
1052 fail_pm_qos:
1053	ieee80211_led_exit(local);
1054	ieee80211_remove_interfaces(local);
1055 fail_wep:
1056	rate_control_deinitialize(local);
1057 fail_rate:
1058	unregister_netdevice(local->mdev);
1059	local->mdev = NULL;
1060 fail_dev:
1061	rtnl_unlock();
1062	sta_info_stop(local);
1063 fail_sta_info:
1064	debugfs_hw_del(local);
1065	destroy_workqueue(local->hw.workqueue);
1066 fail_workqueue:
1067	if (local->mdev)
1068		free_netdev(local->mdev);
1069 fail_mdev_alloc:
1070	wiphy_unregister(local->hw.wiphy);
1071 fail_wiphy_register:
1072	kfree(local->int_scan_req.channels);
1073	return result;
1074}
1075EXPORT_SYMBOL(ieee80211_register_hw);
1076
1077void ieee80211_unregister_hw(struct ieee80211_hw *hw)
1078{
1079	struct ieee80211_local *local = hw_to_local(hw);
1080
1081	tasklet_kill(&local->tx_pending_tasklet);
1082	tasklet_kill(&local->tasklet);
1083
1084	pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
1085			       &local->network_latency_notifier);
1086
1087	rtnl_lock();
1088
1089	/*
1090	 * At this point, interface list manipulations are fine
1091	 * because the driver cannot be handing us frames any
1092	 * more and the tasklet is killed.
1093	 */
1094
1095	/* First, we remove all virtual interfaces. */
1096	ieee80211_remove_interfaces(local);
1097
1098	/* then, finally, remove the master interface */
1099	unregister_netdevice(local->mdev);
1100
1101	rtnl_unlock();
1102
1103	ieee80211_clear_tx_pending(local);
1104	sta_info_stop(local);
1105	rate_control_deinitialize(local);
1106	debugfs_hw_del(local);
1107
1108	if (skb_queue_len(&local->skb_queue)
1109			|| skb_queue_len(&local->skb_queue_unreliable))
1110		printk(KERN_WARNING "%s: skb_queue not empty\n",
1111		       wiphy_name(local->hw.wiphy));
1112	skb_queue_purge(&local->skb_queue);
1113	skb_queue_purge(&local->skb_queue_unreliable);
1114
1115	destroy_workqueue(local->hw.workqueue);
1116	wiphy_unregister(local->hw.wiphy);
1117	ieee80211_wep_free(local);
1118	ieee80211_led_exit(local);
1119	free_netdev(local->mdev);
1120	kfree(local->int_scan_req.channels);
1121}
1122EXPORT_SYMBOL(ieee80211_unregister_hw);
1123
1124void ieee80211_free_hw(struct ieee80211_hw *hw)
1125{
1126	struct ieee80211_local *local = hw_to_local(hw);
1127
1128	mutex_destroy(&local->iflist_mtx);
1129
1130	wiphy_free(local->hw.wiphy);
1131}
1132EXPORT_SYMBOL(ieee80211_free_hw);
1133
1134static int __init ieee80211_init(void)
1135{
1136	struct sk_buff *skb;
1137	int ret;
1138
1139	BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1140	BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1141		     IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1142
1143	ret = rc80211_minstrel_init();
1144	if (ret)
1145		return ret;
1146
1147	ret = rc80211_pid_init();
1148	if (ret)
1149		return ret;
1150
1151	ieee80211_debugfs_netdev_init();
1152
1153	return 0;
1154}
1155
1156static void __exit ieee80211_exit(void)
1157{
1158	rc80211_pid_exit();
1159	rc80211_minstrel_exit();
1160
1161	/*
1162	 * For key todo, it'll be empty by now but the work
1163	 * might still be scheduled.
1164	 */
1165	flush_scheduled_work();
1166
1167	if (mesh_allocated)
1168		ieee80211s_stop();
1169
1170	ieee80211_debugfs_netdev_exit();
1171}
1172
1173
1174subsys_initcall(ieee80211_init);
1175module_exit(ieee80211_exit);
1176
1177MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1178MODULE_LICENSE("GPL");
1179