main.c revision d4c4a9a1bce1912ed5681251f0037fd4f2364a3e 
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	memset(&conf, 0, sizeof(conf));
165
166	if (sdata->vif.type == NL80211_IFTYPE_STATION)
167		conf.bssid = sdata->u.mgd.bssid;
168	else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
169		conf.bssid = sdata->u.ibss.bssid;
170	else if (sdata->vif.type == NL80211_IFTYPE_AP)
171		conf.bssid = sdata->dev->dev_addr;
172	else if (ieee80211_vif_is_mesh(&sdata->vif)) {
173		static const u8 zero[ETH_ALEN] = { 0 };
174		conf.bssid = zero;
175	} else {
176		WARN_ON(1);
177		return -EINVAL;
178	}
179
180	if (!local->ops->config_interface)
181		return 0;
182
183	switch (sdata->vif.type) {
184	case NL80211_IFTYPE_AP:
185	case NL80211_IFTYPE_ADHOC:
186	case NL80211_IFTYPE_MESH_POINT:
187		break;
188	default:
189		/* do not warn to simplify caller in scan.c */
190		changed &= ~IEEE80211_IFCC_BEACON_ENABLED;
191		if (WARN_ON(changed & IEEE80211_IFCC_BEACON))
192			return -EINVAL;
193		changed &= ~IEEE80211_IFCC_BEACON;
194		break;
195	}
196
197	if (changed & IEEE80211_IFCC_BEACON_ENABLED) {
198		if (local->sw_scanning) {
199			conf.enable_beacon = false;
200		} else {
201			/*
202			 * Beacon should be enabled, but AP mode must
203			 * check whether there is a beacon configured.
204			 */
205			switch (sdata->vif.type) {
206			case NL80211_IFTYPE_AP:
207				conf.enable_beacon =
208					!!rcu_dereference(sdata->u.ap.beacon);
209				break;
210			case NL80211_IFTYPE_ADHOC:
211				conf.enable_beacon = !!sdata->u.ibss.probe_resp;
212				break;
213			case NL80211_IFTYPE_MESH_POINT:
214				conf.enable_beacon = true;
215				break;
216			default:
217				/* not reached */
218				WARN_ON(1);
219				break;
220			}
221		}
222	}
223
224	conf.changed = changed;
225
226	return local->ops->config_interface(local_to_hw(local),
227					    &sdata->vif, &conf);
228}
229
230int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
231{
232	struct ieee80211_channel *chan;
233	int ret = 0;
234	int power;
235	enum nl80211_channel_type channel_type;
236
237	might_sleep();
238
239	if (local->sw_scanning) {
240		chan = local->scan_channel;
241		channel_type = NL80211_CHAN_NO_HT;
242	} else {
243		chan = local->oper_channel;
244		channel_type = local->oper_channel_type;
245	}
246
247	if (chan != local->hw.conf.channel ||
248	    channel_type != local->hw.conf.channel_type) {
249		local->hw.conf.channel = chan;
250		local->hw.conf.channel_type = channel_type;
251		changed |= IEEE80211_CONF_CHANGE_CHANNEL;
252	}
253
254	if (local->sw_scanning)
255		power = chan->max_power;
256	else
257		power = local->power_constr_level ?
258			(chan->max_power - local->power_constr_level) :
259			chan->max_power;
260
261	if (local->user_power_level >= 0)
262		power = min(power, local->user_power_level);
263
264	if (local->hw.conf.power_level != power) {
265		changed |= IEEE80211_CONF_CHANGE_POWER;
266		local->hw.conf.power_level = power;
267	}
268
269	if (changed && local->open_count) {
270		ret = local->ops->config(local_to_hw(local), changed);
271		/*
272		 * Goal:
273		 * HW reconfiguration should never fail, the driver has told
274		 * us what it can support so it should live up to that promise.
275		 *
276		 * Current status:
277		 * rfkill is not integrated with mac80211 and a
278		 * configuration command can thus fail if hardware rfkill
279		 * is enabled
280		 *
281		 * FIXME: integrate rfkill with mac80211 and then add this
282		 * WARN_ON() back
283		 *
284		 */
285		/* WARN_ON(ret); */
286	}
287
288	return ret;
289}
290
291void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
292				      u32 changed)
293{
294	struct ieee80211_local *local = sdata->local;
295
296	if (WARN_ON(sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
297		return;
298
299	if (!changed)
300		return;
301
302	if (local->ops->bss_info_changed)
303		local->ops->bss_info_changed(local_to_hw(local),
304					     &sdata->vif,
305					     &sdata->vif.bss_conf,
306					     changed);
307}
308
309u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
310{
311	sdata->vif.bss_conf.use_cts_prot = false;
312	sdata->vif.bss_conf.use_short_preamble = false;
313	sdata->vif.bss_conf.use_short_slot = false;
314	return BSS_CHANGED_ERP_CTS_PROT |
315	       BSS_CHANGED_ERP_PREAMBLE |
316	       BSS_CHANGED_ERP_SLOT;
317}
318
319void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
320				 struct sk_buff *skb)
321{
322	struct ieee80211_local *local = hw_to_local(hw);
323	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
324	int tmp;
325
326	skb->dev = local->mdev;
327	skb->pkt_type = IEEE80211_TX_STATUS_MSG;
328	skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ?
329		       &local->skb_queue : &local->skb_queue_unreliable, skb);
330	tmp = skb_queue_len(&local->skb_queue) +
331		skb_queue_len(&local->skb_queue_unreliable);
332	while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
333	       (skb = skb_dequeue(&local->skb_queue_unreliable))) {
334		dev_kfree_skb_irq(skb);
335		tmp--;
336		I802_DEBUG_INC(local->tx_status_drop);
337	}
338	tasklet_schedule(&local->tasklet);
339}
340EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
341
342static void ieee80211_tasklet_handler(unsigned long data)
343{
344	struct ieee80211_local *local = (struct ieee80211_local *) data;
345	struct sk_buff *skb;
346	struct ieee80211_rx_status rx_status;
347	struct ieee80211_ra_tid *ra_tid;
348
349	while ((skb = skb_dequeue(&local->skb_queue)) ||
350	       (skb = skb_dequeue(&local->skb_queue_unreliable))) {
351		switch (skb->pkt_type) {
352		case IEEE80211_RX_MSG:
353			/* status is in skb->cb */
354			memcpy(&rx_status, skb->cb, sizeof(rx_status));
355			/* Clear skb->pkt_type in order to not confuse kernel
356			 * netstack. */
357			skb->pkt_type = 0;
358			__ieee80211_rx(local_to_hw(local), skb, &rx_status);
359			break;
360		case IEEE80211_TX_STATUS_MSG:
361			skb->pkt_type = 0;
362			ieee80211_tx_status(local_to_hw(local), skb);
363			break;
364		case IEEE80211_DELBA_MSG:
365			ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
366			ieee80211_stop_tx_ba_cb(local_to_hw(local),
367						ra_tid->ra, ra_tid->tid);
368			dev_kfree_skb(skb);
369			break;
370		case IEEE80211_ADDBA_MSG:
371			ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
372			ieee80211_start_tx_ba_cb(local_to_hw(local),
373						 ra_tid->ra, ra_tid->tid);
374			dev_kfree_skb(skb);
375			break ;
376		default:
377			WARN(1, "mac80211: Packet is of unknown type %d\n",
378			     skb->pkt_type);
379			dev_kfree_skb(skb);
380			break;
381		}
382	}
383}
384
385/* Remove added headers (e.g., QoS control), encryption header/MIC, etc. to
386 * make a prepared TX frame (one that has been given to hw) to look like brand
387 * new IEEE 802.11 frame that is ready to go through TX processing again.
388 */
389static void ieee80211_remove_tx_extra(struct ieee80211_local *local,
390				      struct ieee80211_key *key,
391				      struct sk_buff *skb)
392{
393	unsigned int hdrlen, iv_len, mic_len;
394	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
395
396	hdrlen = ieee80211_hdrlen(hdr->frame_control);
397
398	if (!key)
399		goto no_key;
400
401	switch (key->conf.alg) {
402	case ALG_WEP:
403		iv_len = WEP_IV_LEN;
404		mic_len = WEP_ICV_LEN;
405		break;
406	case ALG_TKIP:
407		iv_len = TKIP_IV_LEN;
408		mic_len = TKIP_ICV_LEN;
409		break;
410	case ALG_CCMP:
411		iv_len = CCMP_HDR_LEN;
412		mic_len = CCMP_MIC_LEN;
413		break;
414	default:
415		goto no_key;
416	}
417
418	if (skb->len >= hdrlen + mic_len &&
419	    !(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
420		skb_trim(skb, skb->len - mic_len);
421	if (skb->len >= hdrlen + iv_len) {
422		memmove(skb->data + iv_len, skb->data, hdrlen);
423		hdr = (struct ieee80211_hdr *)skb_pull(skb, iv_len);
424	}
425
426no_key:
427	if (ieee80211_is_data_qos(hdr->frame_control)) {
428		hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
429		memmove(skb->data + IEEE80211_QOS_CTL_LEN, skb->data,
430			hdrlen - IEEE80211_QOS_CTL_LEN);
431		skb_pull(skb, IEEE80211_QOS_CTL_LEN);
432	}
433}
434
435static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
436					    struct sta_info *sta,
437					    struct sk_buff *skb)
438{
439	sta->tx_filtered_count++;
440
441	/*
442	 * Clear the TX filter mask for this STA when sending the next
443	 * packet. If the STA went to power save mode, this will happen
444	 * when it wakes up for the next time.
445	 */
446	set_sta_flags(sta, WLAN_STA_CLEAR_PS_FILT);
447
448	/*
449	 * This code races in the following way:
450	 *
451	 *  (1) STA sends frame indicating it will go to sleep and does so
452	 *  (2) hardware/firmware adds STA to filter list, passes frame up
453	 *  (3) hardware/firmware processes TX fifo and suppresses a frame
454	 *  (4) we get TX status before having processed the frame and
455	 *	knowing that the STA has gone to sleep.
456	 *
457	 * This is actually quite unlikely even when both those events are
458	 * processed from interrupts coming in quickly after one another or
459	 * even at the same time because we queue both TX status events and
460	 * RX frames to be processed by a tasklet and process them in the
461	 * same order that they were received or TX status last. Hence, there
462	 * is no race as long as the frame RX is processed before the next TX
463	 * status, which drivers can ensure, see below.
464	 *
465	 * Note that this can only happen if the hardware or firmware can
466	 * actually add STAs to the filter list, if this is done by the
467	 * driver in response to set_tim() (which will only reduce the race
468	 * this whole filtering tries to solve, not completely solve it)
469	 * this situation cannot happen.
470	 *
471	 * To completely solve this race drivers need to make sure that they
472	 *  (a) don't mix the irq-safe/not irq-safe TX status/RX processing
473	 *	functions and
474	 *  (b) always process RX events before TX status events if ordering
475	 *      can be unknown, for example with different interrupt status
476	 *	bits.
477	 */
478	if (test_sta_flags(sta, WLAN_STA_PS) &&
479	    skb_queue_len(&sta->tx_filtered) < STA_MAX_TX_BUFFER) {
480		ieee80211_remove_tx_extra(local, sta->key, skb);
481		skb_queue_tail(&sta->tx_filtered, skb);
482		return;
483	}
484
485	if (!test_sta_flags(sta, WLAN_STA_PS) && !skb->requeue) {
486		/* Software retry the packet once */
487		skb->requeue = 1;
488		ieee80211_remove_tx_extra(local, sta->key, skb);
489		dev_queue_xmit(skb);
490		return;
491	}
492
493#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
494	if (net_ratelimit())
495		printk(KERN_DEBUG "%s: dropped TX filtered frame, "
496		       "queue_len=%d PS=%d @%lu\n",
497		       wiphy_name(local->hw.wiphy),
498		       skb_queue_len(&sta->tx_filtered),
499		       !!test_sta_flags(sta, WLAN_STA_PS), jiffies);
500#endif
501	dev_kfree_skb(skb);
502}
503
504void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
505{
506	struct sk_buff *skb2;
507	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
508	struct ieee80211_local *local = hw_to_local(hw);
509	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
510	u16 frag, type;
511	__le16 fc;
512	struct ieee80211_supported_band *sband;
513	struct ieee80211_tx_status_rtap_hdr *rthdr;
514	struct ieee80211_sub_if_data *sdata;
515	struct net_device *prev_dev = NULL;
516	struct sta_info *sta;
517	int retry_count = -1, i;
518
519	for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
520		/* the HW cannot have attempted that rate */
521		if (i >= hw->max_rates) {
522			info->status.rates[i].idx = -1;
523			info->status.rates[i].count = 0;
524		}
525
526		retry_count += info->status.rates[i].count;
527	}
528	if (retry_count < 0)
529		retry_count = 0;
530
531	rcu_read_lock();
532
533	sband = local->hw.wiphy->bands[info->band];
534
535	sta = sta_info_get(local, hdr->addr1);
536
537	if (sta) {
538		if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
539		    test_sta_flags(sta, WLAN_STA_PS)) {
540			/*
541			 * The STA is in power save mode, so assume
542			 * that this TX packet failed because of that.
543			 */
544			ieee80211_handle_filtered_frame(local, sta, skb);
545			rcu_read_unlock();
546			return;
547		}
548
549		fc = hdr->frame_control;
550
551		if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
552		    (ieee80211_is_data_qos(fc))) {
553			u16 tid, ssn;
554			u8 *qc;
555
556			qc = ieee80211_get_qos_ctl(hdr);
557			tid = qc[0] & 0xf;
558			ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
559						& IEEE80211_SCTL_SEQ);
560			ieee80211_send_bar(sta->sdata, hdr->addr1,
561					   tid, ssn);
562		}
563
564		if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
565			ieee80211_handle_filtered_frame(local, sta, skb);
566			rcu_read_unlock();
567			return;
568		} else {
569			if (!(info->flags & IEEE80211_TX_STAT_ACK))
570				sta->tx_retry_failed++;
571			sta->tx_retry_count += retry_count;
572		}
573
574		rate_control_tx_status(local, sband, sta, skb);
575	}
576
577	rcu_read_unlock();
578
579	ieee80211_led_tx(local, 0);
580
581	/* SNMP counters
582	 * Fragments are passed to low-level drivers as separate skbs, so these
583	 * are actually fragments, not frames. Update frame counters only for
584	 * the first fragment of the frame. */
585
586	frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG;
587	type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE;
588
589	if (info->flags & IEEE80211_TX_STAT_ACK) {
590		if (frag == 0) {
591			local->dot11TransmittedFrameCount++;
592			if (is_multicast_ether_addr(hdr->addr1))
593				local->dot11MulticastTransmittedFrameCount++;
594			if (retry_count > 0)
595				local->dot11RetryCount++;
596			if (retry_count > 1)
597				local->dot11MultipleRetryCount++;
598		}
599
600		/* This counter shall be incremented for an acknowledged MPDU
601		 * with an individual address in the address 1 field or an MPDU
602		 * with a multicast address in the address 1 field of type Data
603		 * or Management. */
604		if (!is_multicast_ether_addr(hdr->addr1) ||
605		    type == IEEE80211_FTYPE_DATA ||
606		    type == IEEE80211_FTYPE_MGMT)
607			local->dot11TransmittedFragmentCount++;
608	} else {
609		if (frag == 0)
610			local->dot11FailedCount++;
611	}
612
613	/* this was a transmitted frame, but now we want to reuse it */
614	skb_orphan(skb);
615
616	/*
617	 * This is a bit racy but we can avoid a lot of work
618	 * with this test...
619	 */
620	if (!local->monitors && !local->cooked_mntrs) {
621		dev_kfree_skb(skb);
622		return;
623	}
624
625	/* send frame to monitor interfaces now */
626
627	if (skb_headroom(skb) < sizeof(*rthdr)) {
628		printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
629		dev_kfree_skb(skb);
630		return;
631	}
632
633	rthdr = (struct ieee80211_tx_status_rtap_hdr *)
634				skb_push(skb, sizeof(*rthdr));
635
636	memset(rthdr, 0, sizeof(*rthdr));
637	rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
638	rthdr->hdr.it_present =
639		cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
640			    (1 << IEEE80211_RADIOTAP_DATA_RETRIES) |
641			    (1 << IEEE80211_RADIOTAP_RATE));
642
643	if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
644	    !is_multicast_ether_addr(hdr->addr1))
645		rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL);
646
647	/*
648	 * XXX: Once radiotap gets the bitmap reset thing the vendor
649	 *	extensions proposal contains, we can actually report
650	 *	the whole set of tries we did.
651	 */
652	if ((info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) ||
653	    (info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT))
654		rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS);
655	else if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS)
656		rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS);
657	if (info->status.rates[0].idx >= 0 &&
658	    !(info->status.rates[0].flags & IEEE80211_TX_RC_MCS))
659		rthdr->rate = sband->bitrates[
660				info->status.rates[0].idx].bitrate / 5;
661
662	/* for now report the total retry_count */
663	rthdr->data_retries = retry_count;
664
665	/* XXX: is this sufficient for BPF? */
666	skb_set_mac_header(skb, 0);
667	skb->ip_summed = CHECKSUM_UNNECESSARY;
668	skb->pkt_type = PACKET_OTHERHOST;
669	skb->protocol = htons(ETH_P_802_2);
670	memset(skb->cb, 0, sizeof(skb->cb));
671
672	rcu_read_lock();
673	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
674		if (sdata->vif.type == NL80211_IFTYPE_MONITOR) {
675			if (!netif_running(sdata->dev))
676				continue;
677
678			if (prev_dev) {
679				skb2 = skb_clone(skb, GFP_ATOMIC);
680				if (skb2) {
681					skb2->dev = prev_dev;
682					netif_rx(skb2);
683				}
684			}
685
686			prev_dev = sdata->dev;
687		}
688	}
689	if (prev_dev) {
690		skb->dev = prev_dev;
691		netif_rx(skb);
692		skb = NULL;
693	}
694	rcu_read_unlock();
695	dev_kfree_skb(skb);
696}
697EXPORT_SYMBOL(ieee80211_tx_status);
698
699struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
700					const struct ieee80211_ops *ops)
701{
702	struct ieee80211_local *local;
703	int priv_size, i;
704	struct wiphy *wiphy;
705
706	/* Ensure 32-byte alignment of our private data and hw private data.
707	 * We use the wiphy priv data for both our ieee80211_local and for
708	 * the driver's private data
709	 *
710	 * In memory it'll be like this:
711	 *
712	 * +-------------------------+
713	 * | struct wiphy	    |
714	 * +-------------------------+
715	 * | struct ieee80211_local  |
716	 * +-------------------------+
717	 * | driver's private data   |
718	 * +-------------------------+
719	 *
720	 */
721	priv_size = ((sizeof(struct ieee80211_local) +
722		      NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST) +
723		    priv_data_len;
724
725	wiphy = wiphy_new(&mac80211_config_ops, priv_size);
726
727	if (!wiphy)
728		return NULL;
729
730	wiphy->privid = mac80211_wiphy_privid;
731	wiphy->max_scan_ssids = 4;
732	/* Yes, putting cfg80211_bss into ieee80211_bss is a hack */
733	wiphy->bss_priv_size = sizeof(struct ieee80211_bss) -
734			       sizeof(struct cfg80211_bss);
735
736	local = wiphy_priv(wiphy);
737	local->hw.wiphy = wiphy;
738
739	local->hw.priv = (char *)local +
740			 ((sizeof(struct ieee80211_local) +
741			   NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);
742
743	BUG_ON(!ops->tx);
744	BUG_ON(!ops->start);
745	BUG_ON(!ops->stop);
746	BUG_ON(!ops->config);
747	BUG_ON(!ops->add_interface);
748	BUG_ON(!ops->remove_interface);
749	BUG_ON(!ops->configure_filter);
750	local->ops = ops;
751
752	/* set up some defaults */
753	local->hw.queues = 1;
754	local->hw.max_rates = 1;
755	local->rts_threshold = IEEE80211_MAX_RTS_THRESHOLD;
756	local->fragmentation_threshold = IEEE80211_MAX_FRAG_THRESHOLD;
757	local->hw.conf.long_frame_max_tx_count = 4;
758	local->hw.conf.short_frame_max_tx_count = 7;
759	local->hw.conf.radio_enabled = true;
760
761	INIT_LIST_HEAD(&local->interfaces);
762	mutex_init(&local->iflist_mtx);
763
764	spin_lock_init(&local->key_lock);
765
766	spin_lock_init(&local->queue_stop_reason_lock);
767
768	INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
769
770	INIT_WORK(&local->dynamic_ps_enable_work,
771		  ieee80211_dynamic_ps_enable_work);
772	INIT_WORK(&local->dynamic_ps_disable_work,
773		  ieee80211_dynamic_ps_disable_work);
774	setup_timer(&local->dynamic_ps_timer,
775		    ieee80211_dynamic_ps_timer, (unsigned long) local);
776
777	sta_info_init(local);
778
779	for (i = 0; i < IEEE80211_MAX_QUEUES; i++)
780		skb_queue_head_init(&local->pending[i]);
781	tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
782		     (unsigned long)local);
783	tasklet_disable(&local->tx_pending_tasklet);
784
785	tasklet_init(&local->tasklet,
786		     ieee80211_tasklet_handler,
787		     (unsigned long) local);
788	tasklet_disable(&local->tasklet);
789
790	skb_queue_head_init(&local->skb_queue);
791	skb_queue_head_init(&local->skb_queue_unreliable);
792
793	spin_lock_init(&local->ampdu_lock);
794
795	return local_to_hw(local);
796}
797EXPORT_SYMBOL(ieee80211_alloc_hw);
798
799static const struct net_device_ops ieee80211_master_ops = {
800	.ndo_start_xmit = ieee80211_master_start_xmit,
801	.ndo_open = ieee80211_master_open,
802	.ndo_stop = ieee80211_master_stop,
803	.ndo_set_multicast_list = ieee80211_master_set_multicast_list,
804	.ndo_select_queue = ieee80211_select_queue,
805};
806
807static void ieee80211_master_setup(struct net_device *mdev)
808{
809	mdev->type = ARPHRD_IEEE80211;
810	mdev->netdev_ops = &ieee80211_master_ops;
811	mdev->header_ops = &ieee80211_header_ops;
812	mdev->tx_queue_len = 1000;
813	mdev->addr_len = ETH_ALEN;
814}
815
816int ieee80211_register_hw(struct ieee80211_hw *hw)
817{
818	struct ieee80211_local *local = hw_to_local(hw);
819	int result;
820	enum ieee80211_band band;
821	struct net_device *mdev;
822	struct ieee80211_master_priv *mpriv;
823	int channels, i, j;
824
825	/*
826	 * generic code guarantees at least one band,
827	 * set this very early because much code assumes
828	 * that hw.conf.channel is assigned
829	 */
830	channels = 0;
831	for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
832		struct ieee80211_supported_band *sband;
833
834		sband = local->hw.wiphy->bands[band];
835		if (sband && !local->oper_channel) {
836			/* init channel we're on */
837			local->hw.conf.channel =
838			local->oper_channel =
839			local->scan_channel = &sband->channels[0];
840		}
841		if (sband)
842			channels += sband->n_channels;
843	}
844
845	local->int_scan_req.n_channels = channels;
846	local->int_scan_req.channels = kzalloc(sizeof(void *) * channels, GFP_KERNEL);
847	if (!local->int_scan_req.channels)
848		return -ENOMEM;
849
850	/* if low-level driver supports AP, we also support VLAN */
851	if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP))
852		local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
853
854	/* mac80211 always supports monitor */
855	local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
856
857	if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
858		local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
859	else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
860		local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
861
862	result = wiphy_register(local->hw.wiphy);
863	if (result < 0)
864		goto fail_wiphy_register;
865
866	/*
867	 * We use the number of queues for feature tests (QoS, HT) internally
868	 * so restrict them appropriately.
869	 */
870	if (hw->queues > IEEE80211_MAX_QUEUES)
871		hw->queues = IEEE80211_MAX_QUEUES;
872
873	mdev = alloc_netdev_mq(sizeof(struct ieee80211_master_priv),
874			       "wmaster%d", ieee80211_master_setup,
875			       hw->queues);
876	if (!mdev)
877		goto fail_mdev_alloc;
878
879	mpriv = netdev_priv(mdev);
880	mpriv->local = local;
881	local->mdev = mdev;
882
883	local->hw.workqueue =
884		create_singlethread_workqueue(wiphy_name(local->hw.wiphy));
885	if (!local->hw.workqueue) {
886		result = -ENOMEM;
887		goto fail_workqueue;
888	}
889
890	/*
891	 * The hardware needs headroom for sending the frame,
892	 * and we need some headroom for passing the frame to monitor
893	 * interfaces, but never both at the same time.
894	 */
895	local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
896				   sizeof(struct ieee80211_tx_status_rtap_hdr));
897
898	debugfs_hw_add(local);
899
900	if (local->hw.conf.beacon_int < 10)
901		local->hw.conf.beacon_int = 100;
902
903	if (local->hw.max_listen_interval == 0)
904		local->hw.max_listen_interval = 1;
905
906	local->hw.conf.listen_interval = local->hw.max_listen_interval;
907
908	result = sta_info_start(local);
909	if (result < 0)
910		goto fail_sta_info;
911
912	result = ieee80211_wep_init(local);
913	if (result < 0) {
914		printk(KERN_DEBUG "%s: Failed to initialize wep: %d\n",
915		       wiphy_name(local->hw.wiphy), result);
916		goto fail_wep;
917	}
918
919	rtnl_lock();
920	result = dev_alloc_name(local->mdev, local->mdev->name);
921	if (result < 0)
922		goto fail_dev;
923
924	memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
925	SET_NETDEV_DEV(local->mdev, wiphy_dev(local->hw.wiphy));
926	local->mdev->features |= NETIF_F_NETNS_LOCAL;
927
928	result = register_netdevice(local->mdev);
929	if (result < 0)
930		goto fail_dev;
931
932	result = ieee80211_init_rate_ctrl_alg(local,
933					      hw->rate_control_algorithm);
934	if (result < 0) {
935		printk(KERN_DEBUG "%s: Failed to initialize rate control "
936		       "algorithm\n", wiphy_name(local->hw.wiphy));
937		goto fail_rate;
938	}
939
940	/* add one default STA interface if supported */
941	if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
942		result = ieee80211_if_add(local, "wlan%d", NULL,
943					  NL80211_IFTYPE_STATION, NULL);
944		if (result)
945			printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
946			       wiphy_name(local->hw.wiphy));
947	}
948
949	rtnl_unlock();
950
951	ieee80211_led_init(local);
952
953	/* alloc internal scan request */
954	i = 0;
955	local->int_scan_req.ssids = &local->scan_ssid;
956	local->int_scan_req.n_ssids = 1;
957	for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
958		if (!hw->wiphy->bands[band])
959			continue;
960		for (j = 0; j < hw->wiphy->bands[band]->n_channels; j++) {
961			local->int_scan_req.channels[i] =
962				&hw->wiphy->bands[band]->channels[j];
963			i++;
964		}
965	}
966
967	return 0;
968
969fail_rate:
970	unregister_netdevice(local->mdev);
971	local->mdev = NULL;
972fail_dev:
973	rtnl_unlock();
974	ieee80211_wep_free(local);
975fail_wep:
976	sta_info_stop(local);
977fail_sta_info:
978	debugfs_hw_del(local);
979	destroy_workqueue(local->hw.workqueue);
980fail_workqueue:
981	if (local->mdev)
982		free_netdev(local->mdev);
983fail_mdev_alloc:
984	wiphy_unregister(local->hw.wiphy);
985fail_wiphy_register:
986	kfree(local->int_scan_req.channels);
987	return result;
988}
989EXPORT_SYMBOL(ieee80211_register_hw);
990
991void ieee80211_unregister_hw(struct ieee80211_hw *hw)
992{
993	struct ieee80211_local *local = hw_to_local(hw);
994
995	tasklet_kill(&local->tx_pending_tasklet);
996	tasklet_kill(&local->tasklet);
997
998	rtnl_lock();
999
1000	/*
1001	 * At this point, interface list manipulations are fine
1002	 * because the driver cannot be handing us frames any
1003	 * more and the tasklet is killed.
1004	 */
1005
1006	/* First, we remove all virtual interfaces. */
1007	ieee80211_remove_interfaces(local);
1008
1009	/* then, finally, remove the master interface */
1010	unregister_netdevice(local->mdev);
1011
1012	rtnl_unlock();
1013
1014	ieee80211_clear_tx_pending(local);
1015	sta_info_stop(local);
1016	rate_control_deinitialize(local);
1017	debugfs_hw_del(local);
1018
1019	if (skb_queue_len(&local->skb_queue)
1020			|| skb_queue_len(&local->skb_queue_unreliable))
1021		printk(KERN_WARNING "%s: skb_queue not empty\n",
1022		       wiphy_name(local->hw.wiphy));
1023	skb_queue_purge(&local->skb_queue);
1024	skb_queue_purge(&local->skb_queue_unreliable);
1025
1026	destroy_workqueue(local->hw.workqueue);
1027	wiphy_unregister(local->hw.wiphy);
1028	ieee80211_wep_free(local);
1029	ieee80211_led_exit(local);
1030	free_netdev(local->mdev);
1031	kfree(local->int_scan_req.channels);
1032}
1033EXPORT_SYMBOL(ieee80211_unregister_hw);
1034
1035void ieee80211_free_hw(struct ieee80211_hw *hw)
1036{
1037	struct ieee80211_local *local = hw_to_local(hw);
1038
1039	mutex_destroy(&local->iflist_mtx);
1040
1041	wiphy_free(local->hw.wiphy);
1042}
1043EXPORT_SYMBOL(ieee80211_free_hw);
1044
1045static int __init ieee80211_init(void)
1046{
1047	struct sk_buff *skb;
1048	int ret;
1049
1050	BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1051	BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1052		     IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1053
1054	ret = rc80211_minstrel_init();
1055	if (ret)
1056		return ret;
1057
1058	ret = rc80211_pid_init();
1059	if (ret)
1060		return ret;
1061
1062	ieee80211_debugfs_netdev_init();
1063
1064	return 0;
1065}
1066
1067static void __exit ieee80211_exit(void)
1068{
1069	rc80211_pid_exit();
1070	rc80211_minstrel_exit();
1071
1072	/*
1073	 * For key todo, it'll be empty by now but the work
1074	 * might still be scheduled.
1075	 */
1076	flush_scheduled_work();
1077
1078	if (mesh_allocated)
1079		ieee80211s_stop();
1080
1081	ieee80211_debugfs_netdev_exit();
1082}
1083
1084
1085subsys_initcall(ieee80211_init);
1086module_exit(ieee80211_exit);
1087
1088MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1089MODULE_LICENSE("GPL");
1090